Merge branch 'develop' into rados_vol

359 files changed, 20917 insertions, 11888 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e2fb000..a16cb08 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -756,6 +756,13 @@ if (BUILD_TESTING)
     mark_as_advanced (HDF5_TEST_FHEAP_VFD)
   endif ()
 
+  option (HDF5_TEST_VOL "Execute tests with different VOL connectors" OFF)
+  mark_as_advanced (HDF5_TEST_VOL)
+  if (HDF5_TEST_VOL)
+    option (HDF5_TEST_FHEAP_VOL "Execute fheap test with different VOL connectors" ON)
+    mark_as_advanced (HDF5_TEST_FHEAP_VOL)
+  endif ()
+
   option (HDF_TEST_EXPRESS "Control testing framework (0-3)" "0")
   mark_as_advanced (HDF_TEST_EXPRESS)
 
diff --git a/MANIFEST b/MANIFEST
index d106a60..943c154 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -93,13 +93,13 @@
 ./bin/timekeeper      _DO_NOT_DISTRIBUTE_
 ./bin/trace
 ./bin/yodconfigure
-./bin/batch/knl_ctestP.sl
-./bin/batch/knl_ctestS.sl
-./bin/batch/knl_ctestSP.sl
+./bin/batch/ctestP.lsf.in.cmake
+./bin/batch/ctestP.sl.in.cmake
+./bin/batch/ctestS.lsf.in.cmake
+./bin/batch/ctestS.sl.in.cmake
+./bin/batch/knl_ctestP.sl.in.cmake
+./bin/batch/knl_ctestS.sl.in.cmake
 ./bin/batch/knl_H5detect.sl.in.cmake
-./bin/batch/sbatch_ctestS.sl
-./bin/batch/sbatch_ctestP.sl
-./bin/batch/sbatch_ctestSP.sl
 ./bin/pkgscrpts/h5rmflags                  _DO_NOT_DISTRIBUTE_
 ./bin/pkgscrpts/makeHDF5BinaryTarfiles.pl  _DO_NOT_DISTRIBUTE_
 ./bin/pkgscrpts/makeInternalREADME.pl      _DO_NOT_DISTRIBUTE_
@@ -503,7 +503,6 @@
 ./src/H5Apublic.h
 ./src/H5AC.c
 ./src/H5ACdbg.c
-./src/H5AClog.c
 ./src/H5ACmodule.h
 ./src/H5ACmpio.c
 ./src/H5ACpkg.h
@@ -533,6 +532,9 @@
 ./src/H5Cepoch.c
 ./src/H5Cimage.c
 ./src/H5Clog.c
+./src/H5Clog.h
+./src/H5Clog_json.c
+./src/H5Clog_trace.c
 ./src/H5Cmodule.h
 ./src/H5Cmpio.c
 ./src/H5Cpkg.h
@@ -908,6 +910,14 @@
 ./src/H5VLmodule.h
 ./src/H5VLnative.c
 ./src/H5VLnative.h
+./src/H5VLnative_attr.c
+./src/H5VLnative_dataset.c
+./src/H5VLnative_datatype.c
+./src/H5VLnative_file.c
+./src/H5VLnative_group.c
+./src/H5VLnative_link.c
+./src/H5VLnative_object.c
+./src/H5VLnative_private.h
 ./src/H5VLpassthru.c
 ./src/H5VLpassthru.h
 ./src/H5VLpkg.h
@@ -975,13 +985,13 @@
 ./test/cross_read.c
 ./test/dangle.c
 ./test/deflate.h5
+./test/del_many_dense_attrs.c
 ./test/direct_chunk.c
 ./test/dsets.c
 ./test/dt_arith.c
 ./test/dtypes.c
 ./test/dtransform.c
 ./test/earray.c
-./test/echo_vol.c
 ./test/efc.c
 ./test/enc_dec_plist.c
 ./test/enc_dec_plist_cross_platform.c
@@ -1029,6 +1039,7 @@
 ./test/gen_deflate.c
 ./test/gen_file_image.c
 ./test/gen_filespace.c
+./test/gen_filters.c
 ./test/gen_mergemsg.c
 ./test/gen_new_array.c
 ./test/gen_new_fill.c
@@ -1072,6 +1083,8 @@
 ./test/noencoder.h5
 ./test/none.h5
 ./test/ntypes.c
+./test/null_vol_connector.c
+./test/null_vol_connector.h
 ./test/ohdr.c
 ./test/objcopy.c
 ./test/page_buffer.c
@@ -1107,17 +1120,20 @@
 ./test/tcheck_version.c
 ./test/tconfig.c
 ./test/tcoords.c
+./test/testabort_fail.sh.in
 ./test/testcheck_version.sh.in
 ./test/testerror.sh.in
 ./test/testlinks_env.sh.in
-./test/test_filenotclosed.sh.in
 ./test/test_filter_plugin.sh.in
+./test/test_filters_le.h5
+./test/test_filters_be.h5
 ./test/testflushrefresh.sh.in
 ./test/testframe.c
 ./test/testhdf5.c
 ./test/testhdf5.h
 ./test/testlibinfo.sh.in
 ./test/test_usecases.sh.in
+./test/test_vol_plugin.sh.in
 ./test/testmeta.c
 ./test/testswmr.sh.in
 ./test/testvdsswmr.sh.in
@@ -1159,16 +1175,14 @@
 ./test/use_common.c
 ./test/use_disable_mdc_flushes.c
 ./test/use.h
-./test/vfd.c
-./test/vol.c
-./test/test_filters_le.h5
-./test/test_filters_be.h5
-./test/gen_filters.c
 ./test/vds.c
 ./test/vds_swmr.h
 ./test/vds_swmr_gen.c
 ./test/vds_swmr_reader.c
 ./test/vds_swmr_writer.c
+./test/vfd.c
+./test/vol.c
+./test/vol_plugin.c
 
 ./test/testfiles/err_compat_1
 ./test/testfiles/err_compat_2
@@ -1299,6 +1313,7 @@
 ./testpar/t_span_tree.c
 ./testpar/t_init_term.c
 ./testpar/testpar.h
+./testpar/testpflush.sh.in
 ./testpar/testphdf5.c
 ./testpar/testphdf5.h
 
@@ -1405,14 +1420,17 @@
 ./tools/test/h5format_convert/testfiles/h5fc_v_err.ddl.err
 ./tools/test/h5format_convert/testfiles/h5fc_v_non_chunked.ddl
 ./tools/test/h5format_convert/testfiles/h5fc_d_file.ddl
+./tools/test/h5format_convert/testfiles/h5fc_d_file.ddl.err
+./tools/test/h5format_convert/testfiles/h5fc_d_file-d.ddl
 ./tools/test/h5format_convert/testfiles/h5fc_v_ndata_bt1.ddl
 ./tools/test/h5format_convert/testfiles/h5fc_dname.ddl
-./tools/test/h5format_convert/testfiles/h5fc_nonexistdset_file.ddl
+./tools/test/h5format_convert/testfiles/h5fc_dname.err
+./tools/test/h5format_convert/testfiles/h5fc_nonexistfile.ddl.err
+./tools/test/h5format_convert/testfiles/h5fc_nonexistdset_file.ddl.err
 ./tools/test/h5format_convert/testfiles/h5fc_help.ddl
 ./tools/test/h5format_convert/testfiles/h5fc_v_all.ddl
 ./tools/test/h5format_convert/testfiles/h5fc_nooption.ddl
 ./tools/test/h5format_convert/testfiles/h5fc_v_n_1d.ddl
-./tools/test/h5format_convert/testfiles/h5fc_nonexistfile.ddl
 ./tools/test/h5format_convert/testfiles/h5fc_non_v3.h5
 ./tools/test/h5format_convert/testfiles/h5fc_edge_v3.h5
 ./tools/test/h5format_convert/testfiles/h5fc_err_level.h5
@@ -1482,6 +1500,11 @@
 ./tools/test/h5ls/vds_prefix/tvds-4.ls
 ./tools/test/h5ls/vds_prefix/tvds-5.ls
 
+# h5ls test error files
+./tools/test/h5ls/errfiles/nosuchfile.err
+./tools/test/h5ls/errfiles/textlinksrc-nodangle-1.err
+./tools/test/h5ls/errfiles/tgroup-1.err
+
 # h5copy sources
 ./tools/src/h5copy/Makefile.am
 ./tools/src/h5copy/h5copy.c
@@ -1537,10 +1560,11 @@
 ./tools/test/misc/testfiles/h5clear_less_after_size.ddl
 ./tools/test/misc/testfiles/h5clear_less_before_size.ddl
 ./tools/test/misc/testfiles/h5clear_missing_file.ddl
+./tools/test/misc/testfiles/h5clear_missing_file.err
 ./tools/test/misc/testfiles/h5clear_noclose_after_size.ddl
 ./tools/test/misc/testfiles/h5clear_noclose_before_size.ddl
-./tools/test/misc/testfiles/h5clear_no_mdc_image.ddl
-./tools/test/misc/testfiles/h5clear_open_fail.ddl
+./tools/test/misc/testfiles/h5clear_no_mdc_image.err
+./tools/test/misc/testfiles/h5clear_open_fail.err
 ./tools/test/misc/testfiles/h5clear_status_noclose_after_size.ddl
 ./tools/test/misc/testfiles/h5clear_usage.ddl
 ./tools/test/misc/testfiles/h5clear_user_equal_after_size.ddl
@@ -1594,10 +1618,6 @@
 ./tools/test/h5stat/testh5stat.sh.in
 ./tools/test/h5stat/testfiles/h5stat_dims1.ddl
 ./tools/test/h5stat/testfiles/h5stat_dims2.ddl
-./tools/test/h5stat/testfiles/h5stat_err1_dims.ddl
-./tools/test/h5stat/testfiles/h5stat_err1_links.ddl
-./tools/test/h5stat/testfiles/h5stat_err1_numattrs.ddl
-./tools/test/h5stat/testfiles/h5stat_err2_numattrs.ddl
 ./tools/test/h5stat/testfiles/h5stat_err_old_fill.h5
 ./tools/test/h5stat/testfiles/h5stat_err_old_fill.ddl
 ./tools/test/h5stat/testfiles/h5stat_err_old_layout.h5
@@ -1635,6 +1655,15 @@
 ./tools/test/h5stat/testfiles/h5stat_threshold.h5
 ./tools/test/h5stat/testfiles/h5stat_tsohm.ddl
 ./tools/test/h5stat/testfiles/h5stat_tsohm.h5
+./tools/test/h5stat/testfiles/h5stat_err_refcount.err
+./tools/test/h5stat/testfiles/h5stat_err_old_layout.err
+./tools/test/h5stat/testfiles/h5stat_err_old_fill.err
+./tools/test/h5stat/testfiles/h5stat_err1_dims.err
+./tools/test/h5stat/testfiles/h5stat_err1_links.err
+./tools/test/h5stat/testfiles/h5stat_err1_numattrs.err
+./tools/test/h5stat/testfiles/h5stat_err2_numattrs.err
+./tools/test/h5stat/testfiles/h5stat_notexist.err
+./tools/test/h5stat/testfiles/h5stat_nofile.err
 
 # h5dump test files
 ./tools/testfiles/charsets.h5
@@ -2296,7 +2325,6 @@
 ./tools/test/h5diff/testfiles/h5diff_600.txt
 ./tools/test/h5diff/testfiles/h5diff_601.txt
 ./tools/test/h5diff/testfiles/h5diff_601_ERR.err
-./tools/test/h5diff/testfiles/h5diff_601_ERR.txt
 ./tools/test/h5diff/testfiles/h5diff_603.txt
 ./tools/test/h5diff/testfiles/h5diff_604.txt
 ./tools/test/h5diff/testfiles/h5diff_605.txt
@@ -2403,21 +2431,12 @@
 ./tools/test/h5diff/testfiles/h5diff_452.txt
 ./tools/test/h5diff/testfiles/h5diff_453.txt
 ./tools/test/h5diff/testfiles/h5diff_454.txt
-./tools/test/h5diff/testfiles/h5diff_454_ERR.err
-./tools/test/h5diff/testfiles/h5diff_454_ERR.txt
+./tools/test/h5diff/testfiles/dangling_link.err
 ./tools/test/h5diff/testfiles/h5diff_455.txt
-./tools/test/h5diff/testfiles/h5diff_455_ERR.err
-./tools/test/h5diff/testfiles/h5diff_455_ERR.txt
 ./tools/test/h5diff/testfiles/h5diff_456.txt
 ./tools/test/h5diff/testfiles/h5diff_457.txt
-./tools/test/h5diff/testfiles/h5diff_457_ERR.err
-./tools/test/h5diff/testfiles/h5diff_457_ERR.txt
 ./tools/test/h5diff/testfiles/h5diff_458.txt
-./tools/test/h5diff/testfiles/h5diff_458_ERR.err
-./tools/test/h5diff/testfiles/h5diff_458_ERR.txt
 ./tools/test/h5diff/testfiles/h5diff_459.txt
-./tools/test/h5diff/testfiles/h5diff_459_ERR.err
-./tools/test/h5diff/testfiles/h5diff_459_ERR.txt
 ./tools/test/h5diff/testfiles/h5diff_465.txt
 ./tools/test/h5diff/testfiles/h5diff_466.txt
 ./tools/test/h5diff/testfiles/h5diff_467.txt
@@ -2507,6 +2526,7 @@
 ./tools/test/h5diff/testfiles/tudfilter.h5
 ./tools/test/h5diff/testfiles/tudfilter2.h5
 ./tools/test/h5diff/testfiles/h5diff_ud.txt
+./tools/test/h5diff/testfiles/h5diff_udfail.err
 ./tools/test/h5diff/testfiles/h5diff_udfail.txt
 ./tools/test/h5diff/testfiles/diff_strings1.h5
 ./tools/test/h5diff/testfiles/diff_strings2.h5
@@ -2607,6 +2627,7 @@
 ./tools/test/h5copy/testfiles/h5copy_extlinks_src.h5
 ./tools/test/h5copy/testfiles/h5copy_extlinks_trg.h5
 ./tools/test/h5copy/testfiles/h5copy_extlinks_src.out.ls
+./tools/test/h5copy/testfiles/h5copy_misc1.err
 ./tools/test/h5copy/testfiles/h5copy_misc1.out
 ./tools/test/h5copy/testfiles/h5copytst_new.h5
 ./tools/test/h5copy/testfiles/h5copytst_new.out.ls
@@ -2775,16 +2796,17 @@
 
 # expected test output from testing h5watch
 #
-./hl/tools/testfiles/w-err-cmpd1.ddl
-./hl/tools/testfiles/w-err-cmpd2.ddl
-./hl/tools/testfiles/w-err-cmpd3.ddl
-./hl/tools/testfiles/w-err-cmpd4.ddl
-./hl/tools/testfiles/w-err-cmpd5.ddl
-./hl/tools/testfiles/w-err-dset1.ddl
-./hl/tools/testfiles/w-err-dset2.ddl
-./hl/tools/testfiles/w-err-dset-nomax.ddl
-./hl/tools/testfiles/w-err-dset-none.ddl
-./hl/tools/testfiles/w-err-file.ddl
+./hl/tools/testfiles/w-err-std.ddl
+./hl/tools/testfiles/w-err-cmpd1.err
+./hl/tools/testfiles/w-err-cmpd2.err
+./hl/tools/testfiles/w-err-cmpd3.err
+./hl/tools/testfiles/w-err-cmpd4.err
+./hl/tools/testfiles/w-err-cmpd5.err
+./hl/tools/testfiles/w-err-dset1.err
+./hl/tools/testfiles/w-err-dset2.err
+./hl/tools/testfiles/w-err-dset-nomax.err
+./hl/tools/testfiles/w-err-dset-none.err
+./hl/tools/testfiles/w-err-file.err
 ./hl/tools/testfiles/w-err-poll0.ddl
 ./hl/tools/testfiles/w-err-poll.ddl
 ./hl/tools/testfiles/w-err-width.ddl
@@ -2894,6 +2916,8 @@
 ./java/src/jni/h5sImp.h
 ./java/src/jni/h5tImp.c
 ./java/src/jni/h5tImp.h
+./java/src/jni/h5vlImp.c
+./java/src/jni/h5vlImp.h
 ./java/src/jni/h5zImp.c
 ./java/src/jni/h5zImp.h
 
@@ -3132,6 +3156,7 @@
 ./java/test/testfiles/JUnit-TestH5Tparams.txt
 ./java/test/testfiles/JUnit-TestH5Tbasic.txt
 ./java/test/testfiles/JUnit-TestH5T.txt
+./java/test/testfiles/JUnit-TestH5VL.txt
 ./java/test/testfiles/JUnit-TestH5Z.txt
 ./java/test/h5ex_g_iterate.orig
 ./java/test/TestH5.java
@@ -3169,6 +3194,7 @@
 ./java/test/TestH5Tparams.java
 ./java/test/TestH5Tbasic.java
 ./java/test/TestH5T.java
+./java/test/TestH5VL.java
 ./java/test/TestH5Z.java
 ./java/test/TestAll.java
 
@@ -3183,6 +3209,7 @@
 ./config/toolchain/crayle.cmake
 ./config/toolchain/GCC.cmake
 ./config/toolchain/intel.cmake
+./config/toolchain/PGI.cmake
 
 ./config/cmake/cacheinit.cmake
 ./config/cmake/CMakeFindJavaCommon.cmake
@@ -3213,6 +3240,7 @@
 ./config/cmake/UseJavaSymlinks.cmake
 ./config/cmake/userblockTest.cmake
 ./config/cmake/vfdTest.cmake
+./config/cmake/volTest.cmake
 ./config/cmake/wait_H5Tinit.cmake
 
 ./config/cmake_ext_mod/ConfigureChecks.cmake
@@ -3253,6 +3281,7 @@
 ./c++/src/CMakeLists.txt
 ./c++/test/CMakeLists.txt
 ./c++/test/CMakeTests.cmake
+./c++/test/CMakeVFDTests.cmake
 ./examples/CMakeLists.txt
 ./examples/CMakeTests.cmake
 ./examples/run-all-ex.sh
@@ -3292,10 +3321,12 @@
 ./test/CMakeLists.txt
 ./test/CMakeTests.cmake
 ./test/CMakeVFDTests.cmake
+./test/CMakeVOLTests.cmake
 ./test/flushrefreshTest.cmake
 ./test/ShellTests.cmake
 ./testpar/CMakeLists.txt
 ./testpar/CMakeTests.cmake
+./testpar/CMakeVFDTests.cmake
 ./tools/CMakeLists.txt
 ./tools/lib/CMakeLists.txt
 ./tools/src/CMakeLists.txt
@@ -3328,6 +3359,7 @@
 ./tools/src/h5repack/CMakeLists.txt
 ./tools/test/h5repack/CMakeLists.txt
 ./tools/test/h5repack/CMakeTests.cmake
+./tools/test/h5repack/CMakeVFDTests.cmake
 ./tools/src/h5stat/CMakeLists.txt
 ./tools/test/h5stat/CMakeLists.txt
 ./tools/test/h5stat/CMakeTests.cmake
diff --git a/bin/batch/ctestP.lsf.in.cmake b/bin/batch/ctestP.lsf.in.cmake
new file mode 100644
index 0000000..2777f39
--- /dev/null
+++ b/bin/batch/ctestP.lsf.in.cmake
@@ -0,0 +1,19 @@
+#!/bin/tcsh
+### LSF syntax
+#BSUB -nnodes 1                  #number of nodes
+#BSUB -W 30                      #walltime in minutes
+#BSUB -G guests                  #account
+#BSUB -e ctestPerrors.txt        #stderr
+#BSUB -o ctestPoutput.txt        #stdout
+#BSUB -J hdf5_ctestP             #job
+##BSUB -q pbatch                 #queue to use
+#BSUB -q pdebug
+
+##date; hostname
+##echo -n 'JobID is '; echo $LSB_JOBID
+
+cd @HDF5_BINARY_DIR@
+echo "Run parallel test command. Test output will be in build/ctestP.out"
+ctest . -R 'TEST_PAR|PH5DIFF|PERFORM' -E t_cache_image -C Release -T test >& ctestP.out
+
+echo "Done running ctest parallel command."
diff --git a/bin/batch/sbatch_ctestP.sl b/bin/batch/ctestP.sl.in.cmake
index e967dce..230a642 100644
--- a/bin/batch/sbatch_ctestP.sl
+++ b/bin/batch/ctestP.sl.in.cmake
@@ -7,8 +7,7 @@
 #SBATCH --export=ALL
 #SBATCH --job-name=h5_ctestS
 
-
-cd build
+cd @HDF5_BINARY_DIR@
 CMD="ctest . -R TEST_PAR|PH5DIFF|PERFORM -E t_cache_image -C Release -T test"
 
 echo "Run $CMD. Test output will be in build/ctestP.out"
diff --git a/bin/batch/ctestS.lsf.in.cmake b/bin/batch/ctestS.lsf.in.cmake
new file mode 100644
index 0000000..5692574
--- /dev/null
+++ b/bin/batch/ctestS.lsf.in.cmake
@@ -0,0 +1,18 @@
+#!/bin/tcsh
+### LSF syntax
+#BSUB -nnodes 1                  #number of nodes
+#BSUB -W 29                      #walltime in minutes
+#BSUB -G guests                  #account
+#BSUB -e ctestSerrors.txt        #stderr
+#BSUB -o ctestSoutput.txt        #stdout
+#BSUB -J hdf5_ctestS             #job
+##BSUB -q pbatch                 #queue to use
+#BSUB -q pdebug
+
+cd @HDF5_BINARY_DIR@
+echo "Run command. Test output will be in build/ctestS.out"
+ctest . -E 'TEST_PAR|H5DIFF|PERFORM' -C Release -j 32 -T test >& ctestS.out
+
+##$CMD  >& ctestS.out
+echo "Done running command."
+
diff --git a/bin/batch/sbatch_ctestS.sl b/bin/batch/ctestS.sl.in.cmake
index a103356..9802e13 100644
--- a/bin/batch/sbatch_ctestS.sl
+++ b/bin/batch/ctestS.sl.in.cmake
@@ -7,8 +7,7 @@
 #SBATCH --export=ALL
 #SBATCH --job-name=h5_ctestS
 
-
-cd build
+cd @HDF5_BINARY_DIR@
 CMD="ctest . -E TEST_PAR|H5DIFF|PERFORM -C Release -j 32 -T test"
 
 echo "Run $CMD. Test output will be in build/ctestS.out"
diff --git a/bin/batch/knl_ctestP.sl b/bin/batch/knl_ctestP.sl.in.cmake
index 3a03fe2..687804b 100644
--- a/bin/batch/knl_ctestP.sl
+++ b/bin/batch/knl_ctestP.sl.in.cmake
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-#SBATCH -p knl -C quad,flat
+#SBATCH -C knl,quad,cache
 #SBATCH --nodes=1
 #SBATCH -t 00:30:00
 #SBATCH --mail-type=BEGIN,END,FAIL
@@ -8,7 +8,7 @@
 #SBATCH --export=ALL
 #SBATCH --job-name=h5_ctestS
 
-cd build
+cd @HDF5_BINARY_DIR@
 #run parallel tests except t_cache_image test
 CMD="ctest . -R TEST_PAR|PH5DIFF|PERFORM -E t_cache_image -C Release -T test"
 
diff --git a/bin/batch/knl_ctestS.sl b/bin/batch/knl_ctestS.sl.in.cmake
index 5b77c5b..de1335c 100644
--- a/bin/batch/knl_ctestS.sl
+++ b/bin/batch/knl_ctestS.sl.in.cmake
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-#SBATCH -p knl -C quad,flat
+#SBATCH -C knl,quad,cache
 #SBATCH --nodes=1
 #SBATCH -t 00:30:00
 #SBATCH --mail-type=BEGIN,END,FAIL
@@ -8,7 +8,7 @@
 #SBATCH --export=ALL
 #SBATCH --job-name=h5_ctestS
 
-cd build
+cd @HDF5_BINARY_DIR@
 CMD="ctest . -E TEST_PAR|H5DIFF|PERFORM -C Release -j 32 -T test"
 
 echo "Run $CMD. Test output will be in build/ctestS.out"
diff --git a/bin/batch/knl_ctestSP.sl b/bin/batch/knl_ctestSP.sl
deleted file mode 100644
index 56da347..0000000
--- a/bin/batch/knl_ctestSP.sl
+++ /dev/null
@@ -1,28 +0,0 @@
-#!/bin/bash
-
-#SBATCH -p knl -C quad,flat
-#SBATCH --nodes=1
-#SBATCH -t 01:00:00
-#SBATCH --mail-type=BEGIN,END,FAIL
-##SBATCH --mail-user=<username>@sandia.gov
-#SBATCH --export=ALL
-#SBATCH --job-name=h5_ctestS
-
-module load cmake
-module load craype-hugepages4M
-
-cd build
-CMD="ctest . -E TEST_PAR|H5DIFF|PERFORM -C Release -j 32 -T test"
-
-echo "Run $CMD. Test output will be in build/ctestS.out"
-$CMD  >& ctestS.out
-echo "Done running $CMD"
-
-
-#run parallel tests except t_cache_image test
-CMD="ctest . -R TEST_PAR|PH5DIFF|PERFORM -E t_cache_image -C Release -T test"
-
-echo "Run $CMD. Test output will be in build/ctestP.out"
-$CMD >& ctestP.out
-echo "Done running $CMD"
-
diff --git a/bin/batch/sbatch_ctestSP.sl b/bin/batch/sbatch_ctestSP.sl
deleted file mode 100644
index 5d79d9b..0000000
--- a/bin/batch/sbatch_ctestSP.sl
+++ /dev/null
@@ -1,25 +0,0 @@
-#!/bin/bash
-
-#SBATCH --nodes=1
-#SBATCH -t 01:00:00
-#SBATCH --mail-type=BEGIN,END,FAIL
-##SBATCH --mail-user=<username>@sandia.gov
-#SBATCH --export=ALL
-#SBATCH --job-name=h5_ctestS
-
-
-cd build
-CMD="ctest . -E TEST_PAR|H5DIFF|PERFORM -C Release -j 32 -T test"
-
-echo "Run $CMD. Test output will be in build/ctestS.out"
-$CMD  >& ctestS.out
-echo "Done running $CMD"
-
-
-#run parallel tests except t_cache_image test
-CMD="ctest . -R TEST_PAR|PH5DIFF|PERFORM -E t_cache_image -C Release -T test"
-
-echo "Run $CMD. Test output will be in build/ctestP.out"
-$CMD >& ctestP.out
-echo "Done running $CMD"
-
diff --git a/c++/src/H5CppDoc.h b/c++/src/H5CppDoc.h
index 0da98a4..5e80408 100644
--- a/c++/src/H5CppDoc.h
+++ b/c++/src/H5CppDoc.h
@@ -53,8 +53,7 @@
  * <br />
  * \section install_sec Installation
  *
- * The HDF5 C++ API is included with the HDF5 source code and can 
- * be obtained from 
+ * The HDF5 C++ API is included with the HDF5 source code.
  * 
  * Please refer to the release_docs/INSTALL file under the top directory 
  * of the HDF5 source code for information about installing, building, 
diff --git a/c++/src/H5IdComponent.cpp b/c++/src/H5IdComponent.cpp
index 20a0a99..40520aa 100644
--- a/c++/src/H5IdComponent.cpp
+++ b/c++/src/H5IdComponent.cpp
@@ -174,7 +174,6 @@ H5I_type_t IdComponent::getHDFObjType() const
 ///             \li \c H5I_DATASPACE
 ///             \li \c H5I_DATASET
 ///             \li \c H5I_ATTR
-///             \li \c H5I_REFERENCE (DEPRECATED)
 ///             \li \c H5I_VFL
 ///             \li \c H5I_VOL
 ///             \li \c H5I_GENPROP_CLS
@@ -228,7 +227,6 @@ bool IdComponent::isValid(hid_t an_id)
 ///             \li \c H5I_DATASPACE
 ///             \li \c H5I_DATASET
 ///             \li \c H5I_ATTR
-///             \li \c H5I_REFERENCE (DEPRECATED)
 ///             \li \c H5I_VFL
 ///             \li \c H5I_VOL
 ///             \li \c H5I_GENPROP_CLS
diff --git a/c++/src/H5PropList.cpp b/c++/src/H5PropList.cpp
index 99f722c..a01878c 100644
--- a/c++/src/H5PropList.cpp
+++ b/c++/src/H5PropList.cpp
@@ -149,7 +149,6 @@ PropList::PropList(const hid_t plist_id) : IdComponent()
         case H5I_DATASPACE:
         case H5I_DATASET:
         case H5I_ATTR:
-        case H5I_REFERENCE:
         case H5I_VFL:
         case H5I_VOL:
         case H5I_ERROR_CLASS:
diff --git a/c++/test/CMakeTests.cmake b/c++/test/CMakeTests.cmake
index 6de801e..02bff3e 100644
--- a/c++/test/CMakeTests.cmake
+++ b/c++/test/CMakeTests.cmake
@@ -47,55 +47,12 @@ else ()
 endif ()
 set_tests_properties (CPP_testhdf5 PROPERTIES DEPENDS CPP_testhdf5-clear-objects)
 
-if (HDF5_TEST_VFD)
-
-  set (VFD_LIST
-      sec2
-      stdio
-      core
-      split
-      multi
-      family
-  )
-
-  if (DIRECT_VFD)
-    set (VFD_LIST ${VFD_LIST} direct)
-  endif ()
-
-  macro (ADD_VFD_TEST vfdname resultcode)
-    if (NOT HDF5_ENABLE_USING_MEMCHECKER)
-      file (MAKE_DIRECTORY "${PROJECT_BINARY_DIR}/${vfdname}")
-      add_test (
-          NAME CPP_VFD-${vfdname}-cpp_testhdf5-clear-objects
-          COMMAND    ${CMAKE_COMMAND}
-              -E remove
-                  tattr_basic.h5
-                  tattr_compound.h5
-                  tattr_dtype.h5
-                  tattr_multi.h5
-                  tattr_scalar.h5
-                  tfattrs.h5
-                  titerate.h5
-      )
-      add_test (
-        NAME CPP_VFD-${vfdname}-cpp_testhdf5
-        COMMAND "${CMAKE_COMMAND}"
-            -D "TEST_PROGRAM=$<TARGET_FILE:cpp_testhdf5>"
-            -D "TEST_ARGS:STRING="
-            -D "TEST_VFD:STRING=${vfdname}"
-            -D "TEST_EXPECT=${resultcode}"
-            -D "TEST_OUTPUT=cpp_testhdf5"
-            -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/${vfdname}"
-            -P "${HDF_RESOURCES_DIR}/vfdTest.cmake"
-      )
-      set_tests_properties (CPP_VFD-${vfdname}-cpp_testhdf5 PROPERTIES DEPENDS CPP_VFD-${vfdname}-cpp_testhdf5-clear-objects)
-      set_tests_properties (CPP_VFD-${vfdname}-cpp_testhdf5 PROPERTIES TIMEOUT 30)
-    endif ()
-  endmacro ()
-
-  # Run test with different Virtual File Driver
-  foreach (vfd ${VFD_LIST})
-    ADD_VFD_TEST (${vfd} 0)
-  endforeach ()
+##############################################################################
+##############################################################################
+###                         V F D   T E S T S                              ###
+##############################################################################
+##############################################################################
 
+if (HDF5_TEST_VFD)
+  include (CMakeVFDTests.cmake)
 endif ()
diff --git a/c++/test/CMakeVFDTests.cmake b/c++/test/CMakeVFDTests.cmake
new file mode 100644
index 0000000..996a20f
--- /dev/null
+++ b/c++/test/CMakeVFDTests.cmake
@@ -0,0 +1,65 @@
+#
+# Copyright by The HDF Group.
+# All rights reserved.
+#
+# This file is part of HDF5.  The full HDF5 copyright notice, including
+# terms governing use, modification, and redistribution, is contained in
+# the COPYING file, which can be found at the root of the source code
+# distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.
+# If you do not have access to either file, you may request a copy from
+# help@hdfgroup.org.
+#
+
+##############################################################################
+##############################################################################
+###           T E S T I N G                                                ###
+##############################################################################
+##############################################################################
+  set (VFD_LIST
+      sec2
+      stdio
+      core
+      split
+      multi
+      family
+  )
+
+  if (DIRECT_VFD)
+    set (VFD_LIST ${VFD_LIST} direct)
+  endif ()
+
+  macro (ADD_VFD_TEST vfdname resultcode)
+    if (NOT HDF5_ENABLE_USING_MEMCHECKER)
+      file (MAKE_DIRECTORY "${PROJECT_BINARY_DIR}/${vfdname}")
+      add_test (
+          NAME CPP_VFD-${vfdname}-cpp_testhdf5-clear-objects
+          COMMAND    ${CMAKE_COMMAND}
+              -E remove
+                  tattr_basic.h5
+                  tattr_compound.h5
+                  tattr_dtype.h5
+                  tattr_multi.h5
+                  tattr_scalar.h5
+                  tfattrs.h5
+                  titerate.h5
+      )
+      add_test (
+        NAME CPP_VFD-${vfdname}-cpp_testhdf5
+        COMMAND "${CMAKE_COMMAND}"
+            -D "TEST_PROGRAM=$<TARGET_FILE:cpp_testhdf5>"
+            -D "TEST_ARGS:STRING="
+            -D "TEST_VFD:STRING=${vfdname}"
+            -D "TEST_EXPECT=${resultcode}"
+            -D "TEST_OUTPUT=cpp_testhdf5"
+            -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/${vfdname}"
+            -P "${HDF_RESOURCES_DIR}/vfdTest.cmake"
+      )
+      set_tests_properties (CPP_VFD-${vfdname}-cpp_testhdf5 PROPERTIES DEPENDS CPP_VFD-${vfdname}-cpp_testhdf5-clear-objects)
+      set_tests_properties (CPP_VFD-${vfdname}-cpp_testhdf5 PROPERTIES TIMEOUT 30)
+    endif ()
+  endmacro ()
+
+  # Run test with different Virtual File Driver
+  foreach (vfd ${VFD_LIST})
+    ADD_VFD_TEST (${vfd} 0)
+  endforeach ()
diff --git a/config/cmake/CTestScript.cmake b/config/cmake/CTestScript.cmake
index 0269ba8..0269ba8 100755..100644
--- a/config/cmake/CTestScript.cmake
+++ b/config/cmake/CTestScript.cmake
diff --git a/config/cmake/ConfigureChecks.cmake b/config/cmake/ConfigureChecks.cmake
index 6d1e3ce..c1abeed 100644
--- a/config/cmake/ConfigureChecks.cmake
+++ b/config/cmake/ConfigureChecks.cmake
@@ -28,15 +28,6 @@ if (HDF5_STRICT_FORMAT_CHECKS)
 endif ()
 MARK_AS_ADVANCED (HDF5_STRICT_FORMAT_CHECKS)
 
-#-----------------------------------------------------------------------------
-# Option for --enable-metadata-trace-file
-#-----------------------------------------------------------------------------
-option (HDF5_METADATA_TRACE_FILE "Enable metadata trace file collection" OFF)
-if (HDF5_METADATA_TRACE_FILE)
-  set (${HDF_PREFIX}_METADATA_TRACE_FILE 1)
-endif ()
-MARK_AS_ADVANCED (HDF5_METADATA_TRACE_FILE)
-
 # ----------------------------------------------------------------------
 # Decide whether the data accuracy has higher priority during data
 # conversions.  If not, some hard conversions will still be prefered even
@@ -256,6 +247,11 @@ H5ConversionTests (${HDF_PREFIX}_LDOUBLE_TO_LLONG_ACCURATE "Checking IF correctl
 #
 H5ConversionTests (${HDF_PREFIX}_LLONG_TO_LDOUBLE_CORRECT "Checking IF correctly converting (unsigned) long long to long double values")
 # ----------------------------------------------------------------------
+# Set the flag to indicate that the machine can accurately convert
+# some long double values
+#
+H5ConversionTests (${HDF_PREFIX}_DISABLE_SOME_LDOUBLE_CONV "Checking IF the cpu is power9 and cannot correctly converting long double values")
+# ----------------------------------------------------------------------
 # Check if pointer alignments are enforced
 #
 H5ConversionTests (${HDF_PREFIX}_NO_ALIGNMENT_RESTRICTIONS "Checking IF alignment restrictions are strictly enforced")
diff --git a/config/cmake/ConversionTests.c b/config/cmake/ConversionTests.c
index c2748b2..6d597a0 100644
--- a/config/cmake/ConversionTests.c
+++ b/config/cmake/ConversionTests.c
@@ -287,3 +287,27 @@ main ()
 
 #endif
 
+#ifdef H5_DISABLE_SOME_LDOUBLE_CONV_TEST
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int HDF_NO_UBSAN main(void)
+{
+    FILE *fp;
+    char cpu[64];
+
+    fp = popen("uname -m", "r");
+
+    fgets(cpu, sizeof(cpu)-1, fp);
+
+    pclose(fp);
+
+    if(strncmp(cpu, "ppc64le", 7) == 0)
+        return 0;
+
+    return 1;
+}
+
+#endif
diff --git a/config/cmake/H5pubconf.h.in b/config/cmake/H5pubconf.h.in
index 2ddb740..a740df2 100644
--- a/config/cmake/H5pubconf.h.in
+++ b/config/cmake/H5pubconf.h.in
@@ -460,15 +460,15 @@
    with special algorithm. */
 #cmakedefine H5_LONG_TO_LDOUBLE_SPECIAL @H5_LONG_TO_LDOUBLE_SPECIAL@
 
+/* Define if your system is power6 and cannot convert some long double values. */
+#cmakedefine H5_DISABLE_SOME_LDOUBLE_CONV @H5_DISABLE_SOME_LDOUBLE_CONV@
+
 /* Define to the sub-directory where libtool stores uninstalled libraries. */
 #cmakedefine H5_LT_OBJDIR @H5_LT_OBJDIR@
 
 /* Define to enable internal memory allocation sanity checking. */
 /* #cmakedefine H5_MEMORY_ALLOC_SANITY_CHECK @H5_MEMORY_ALLOC_SANITY_CHECK@ ** Define in CMakeLists.txt */
 
-/* Define if the metadata trace file code is to be compiled in */
-#cmakedefine H5_METADATA_TRACE_FILE @H5_METADATA_TRACE_FILE@
-
 /* Define if we can violate pointer alignment restrictions */
 #cmakedefine H5_NO_ALIGNMENT_RESTRICTIONS @H5_NO_ALIGNMENT_RESTRICTIONS@
 
@@ -602,6 +602,9 @@
 /* The size of `short', as computed by sizeof. */
 #cmakedefine H5_SIZEOF_SHORT @H5_SIZEOF_SHORT@
 
+/* The size of `time_t', as computed by sizeof. */
+#cmakedefine H5_SIZEOF_TIME_T @H5_SIZEOF_TIME_T@
+
 /* The size of `uint16_t', as computed by sizeof. */
 #cmakedefine H5_SIZEOF_UINT16_T @H5_SIZEOF_UINT16_T@
 
diff --git a/config/cmake/HDF5UseFortran.cmake b/config/cmake/HDF5UseFortran.cmake
index 157befd..a24b2e1 100644
--- a/config/cmake/HDF5UseFortran.cmake
+++ b/config/cmake/HDF5UseFortran.cmake
@@ -18,16 +18,6 @@ ENABLE_LANGUAGE (Fortran)
 set (HDF_PREFIX "H5")
 include (CheckFortranFunctionExists)
 
-## Check for non-standard extenstion quadmath.h
-
-CHECK_INCLUDE_FILES(quadmath.h C_HAVE_QUADMATH)
-
-if (${C_HAVE_QUADMATH})
-  set(${HDF_PREFIX}_HAVE_QUADMATH_H 1)
-else ()
-  set(${HDF_PREFIX}_HAVE_QUADMATH_H 0)
-endif ()
-
 # The provided CMake Fortran macros don't provide a general compile/run function
 # so this one is used.
 #-----------------------------------------------------------------------------
@@ -40,7 +30,7 @@ macro (FORTRAN_RUN FUNCTION_NAME SOURCE_CODE RUN_RESULT_VAR1 COMPILE_RESULT_VAR1
     TRY_RUN (RUN_RESULT_VAR COMPILE_RESULT_VAR
         ${CMAKE_BINARY_DIR}
         ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testFortranCompiler1.f90
-        LINK_LIBRARIES "${CMAKE_REQUIRED_LIBRARIES}"
+        LINK_LIBRARIES "${HDF5_REQUIRED_LIBRARIES}"
     )
 
     if (${COMPILE_RESULT_VAR})
@@ -367,9 +357,9 @@ ENABLE_LANGUAGE (C)
 #-----------------------------------------------------------------------------
 macro (C_RUN FUNCTION_NAME SOURCE_CODE RETURN_VAR)
     message (STATUS "Detecting C ${FUNCTION_NAME}")
-    if (CMAKE_REQUIRED_LIBRARIES)
+    if (HDF5_REQUIRED_LIBRARIES)
       set (CHECK_FUNCTION_EXISTS_ADD_LIBRARIES
-          "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
+          "-DLINK_LIBRARIES:STRING=${HDF5_REQUIRED_LIBRARIES}")
     else ()
       set (CHECK_FUNCTION_EXISTS_ADD_LIBRARIES)
     endif ()
diff --git a/config/cmake/HDF5_Examples_options.cmake b/config/cmake/HDF5_Examples_options.cmake
index 386e99c..386e99c 100755..100644
--- a/config/cmake/HDF5_Examples_options.cmake
+++ b/config/cmake/HDF5_Examples_options.cmake
diff --git a/config/cmake/HDFCompilerFlags.cmake b/config/cmake/HDFCompilerFlags.cmake
index 93ebc3c..0a39568 100644
--- a/config/cmake/HDFCompilerFlags.cmake
+++ b/config/cmake/HDFCompilerFlags.cmake
@@ -9,16 +9,16 @@
 # If you do not have access to either file, you may request a copy from
 # help@hdfgroup.org.
 #
+set(CMAKE_C_STANDARD 99)
+set(CMAKE_C_STANDARD_REQUIRED TRUE)
 
 message (STATUS "Warnings Configuration:")
+set (CMAKE_C_FLAGS "${CMAKE_C99_STANDARD_COMPILE_OPTION} ${CMAKE_C_FLAGS}")
 #-----------------------------------------------------------------------------
 # Compiler specific flags : Shouldn't there be compiler tests for these
 #-----------------------------------------------------------------------------
 if (CMAKE_COMPILER_IS_GNUCC)
   set (CMAKE_C_FLAGS "${CMAKE_ANSI_CFLAGS} ${CMAKE_C_FLAGS}")
-  if (NOT CYGWIN)
-    set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c99")
-  endif ()
   if (${HDF_CFG_NAME} MATCHES "Debug")
     if (NOT CMAKE_C_COMPILER_VERSION VERSION_LESS 5.0)
       set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Og -ftrapv -fno-common")
diff --git a/config/cmake/jrunTest.cmake b/config/cmake/jrunTest.cmake
index b66f3a8..43aef22 100644
--- a/config/cmake/jrunTest.cmake
+++ b/config/cmake/jrunTest.cmake
@@ -32,9 +32,6 @@ endif ()
 if (NOT TEST_CLASSPATH)
   message (STATUS "Require TEST_CLASSPATH to be defined")
 endif ()
-if (NOT TEST_REFERENCE)
-  message (FATAL_ERROR "Require TEST_REFERENCE to be defined")
-endif ()
 
 if (EXISTS ${TEST_FOLDER}/${TEST_OUTPUT})
   file (REMOVE ${TEST_FOLDER}/${TEST_OUTPUT})
@@ -44,14 +41,6 @@ if (EXISTS ${TEST_FOLDER}/${TEST_OUTPUT}.err)
   file (REMOVE ${TEST_FOLDER}/${TEST_OUTPUT}.err)
 endif ()
 
-# if there is not an error reference file add the error output to the stdout file
-if (NOT TEST_ERRREF)
-  if (NOT SKIP_APPEND)
-    # append error file since skip was not defined
-    set (ERROR_APPEND 1)
-  endif ()
-endif ()
-
 if (NOT TEST_LOG_LEVEL)
   set (LOG_LEVEL "info")
 else ()
@@ -131,52 +120,54 @@ message (STATUS "COMMAND Error: ${TEST_ERROR}")
 
 # compare output files to references unless this must be skipped
 if (NOT TEST_SKIP_COMPARE)
-  if (WIN32 AND NOT MINGW)
-    file (READ ${TEST_FOLDER}/${TEST_REFERENCE} TEST_STREAM)
-    file (WRITE ${TEST_FOLDER}/${TEST_REFERENCE} "${TEST_STREAM}")
-  endif ()
+  if (EXISTS ${TEST_FOLDER}/${TEST_REFERENCE})
+    if (WIN32 AND NOT MINGW)
+      file (READ ${TEST_FOLDER}/${TEST_REFERENCE} TEST_STREAM)
+      file (WRITE ${TEST_FOLDER}/${TEST_REFERENCE} "${TEST_STREAM}")
+    endif ()
 
-  # now compare the output with the reference
-  execute_process (
-      COMMAND ${CMAKE_COMMAND} -E compare_files ${TEST_FOLDER}/${TEST_OUTPUT} ${TEST_FOLDER}/${TEST_REFERENCE}
-      RESULT_VARIABLE TEST_RESULT
-  )
-  if (NOT "${TEST_RESULT}" STREQUAL "0")
-    set (TEST_RESULT 0)
-    file (STRINGS ${TEST_FOLDER}/${TEST_OUTPUT} test_act)
-    list (LENGTH test_act len_act)
-    file (STRINGS ${TEST_FOLDER}/${TEST_REFERENCE} test_ref)
-    list (LENGTH test_ref len_ref)
-    if (NOT "${len_act}" STREQUAL "0" AND NOT "${len_ref}" STREQUAL "0")
-      math (EXPR _FP_LEN "${len_ref} - 1")
-      foreach (line RANGE 0 ${_FP_LEN})
-        list (GET test_act ${line} str_act)
-        list (GET test_ref ${line} str_ref)
-        if (NOT "${str_act}" STREQUAL "${str_ref}")
-          if (NOT "${str_act}" STREQUAL "")
-            set (TEST_RESULT 1)
-            message ("line = ${line}\n***ACTUAL: ${str_act}\n****REFER: ${str_ref}\n")
+    # now compare the output with the reference
+    execute_process (
+        COMMAND ${CMAKE_COMMAND} -E compare_files ${TEST_FOLDER}/${TEST_OUTPUT} ${TEST_FOLDER}/${TEST_REFERENCE}
+        RESULT_VARIABLE TEST_RESULT
+    )
+    if (NOT "${TEST_RESULT}" STREQUAL "0")
+      set (TEST_RESULT 0)
+      file (STRINGS ${TEST_FOLDER}/${TEST_OUTPUT} test_act)
+      list (LENGTH test_act len_act)
+      file (STRINGS ${TEST_FOLDER}/${TEST_REFERENCE} test_ref)
+      list (LENGTH test_ref len_ref)
+      if (NOT "${len_act}" STREQUAL "0" AND NOT "${len_ref}" STREQUAL "0")
+        math (EXPR _FP_LEN "${len_ref} - 1")
+        foreach (line RANGE 0 ${_FP_LEN})
+          list (GET test_act ${line} str_act)
+          list (GET test_ref ${line} str_ref)
+          if (NOT "${str_act}" STREQUAL "${str_ref}")
+            if (NOT "${str_act}" STREQUAL "")
+              set (TEST_RESULT 1)
+              message ("line = ${line}\n***ACTUAL: ${str_act}\n****REFER: ${str_ref}\n")
+            endif ()
           endif ()
+        endforeach ()
+      else ()
+        if ("${len_act}" STREQUAL "0")
+          message (STATUS "COMPARE Failed: ${TEST_FOLDER}/${TEST_OUTPUT} is empty")
+        endif ()
+        if ("${len_ref}" STREQUAL "0")
+          message (STATUS "COMPARE Failed: ${TEST_FOLDER}/${TEST_REFERENCE} is empty")
         endif ()
-      endforeach ()
-    else ()
-      if ("${len_act}" STREQUAL "0")
-        message (STATUS "COMPARE Failed: ${TEST_FOLDER}/${TEST_OUTPUT} is empty")
       endif ()
-      if ("${len_ref}" STREQUAL "0")
-        message (STATUS "COMPARE Failed: ${TEST_FOLDER}/${TEST_REFERENCE} is empty")
+      if (NOT "${len_act}" STREQUAL "${len_ref}")
+        set (TEST_RESULT 1)
       endif ()
     endif ()
-    if (NOT "${len_act}" STREQUAL "${len_ref}")
-      set (TEST_RESULT 1)
-    endif ()
-  endif ()
 
-  message (STATUS "COMPARE Result: ${TEST_RESULT}")
+    message (STATUS "COMPARE Result: ${TEST_RESULT}")
 
-  # again, if return value is !=0 scream and shout
-  if (NOT "${TEST_RESULT}" STREQUAL "0")
-    message (FATAL_ERROR "Failed: The output of ${TEST_OUTPUT} did not match ${TEST_REFERENCE}")
+    # again, if return value is !=0 scream and shout
+    if (NOT "${TEST_RESULT}" STREQUAL "0")
+      message (FATAL_ERROR "Failed: The output of ${TEST_OUTPUT} did not match ${TEST_REFERENCE}")
+    endif ()
   endif ()
 
   # now compare the .err file with the error reference, if supplied
@@ -217,7 +208,7 @@ if (NOT TEST_SKIP_COMPARE)
         if ("${len_ref}" STREQUAL "0")
           message (STATUS "COMPARE Failed: ${TEST_FOLDER}/${TEST_ERRREF} is empty")
         endif ()
-      endif()
+      endif ()
       if (NOT "${len_act}" STREQUAL "${len_ref}")
         set (TEST_RESULT 1)
       endif ()
@@ -226,7 +217,7 @@ if (NOT TEST_SKIP_COMPARE)
     message (STATUS "COMPARE Result: ${TEST_RESULT}")
 
     # again, if return value is !=0 scream and shout
-    if (NOT ${TEST_RESULT} STREQUAL 0)
+    if (NOT "${TEST_RESULT}" STREQUAL "0")
       message (FATAL_ERROR "Failed: The error output of ${TEST_OUTPUT}.err did not match ${TEST_ERRREF}")
     endif ()
   endif ()
diff --git a/config/cmake/libh5cc.in b/config/cmake/libh5cc.in
index f462d56..f462d56 100755..100644
--- a/config/cmake/libh5cc.in
+++ b/config/cmake/libh5cc.in
diff --git a/config/cmake/libhdf5.pc.in b/config/cmake/libhdf5.pc.in
index 4a2ebaa..4a2ebaa 100755..100644
--- a/config/cmake/libhdf5.pc.in
+++ b/config/cmake/libhdf5.pc.in
diff --git a/config/cmake/libhdf5.settings.cmake.in b/config/cmake/libhdf5.settings.cmake.in
index 6a489e7..9a534df 100644
--- a/config/cmake/libhdf5.settings.cmake.in
+++ b/config/cmake/libhdf5.settings.cmake.in
@@ -79,7 +79,6 @@ Parallel Filtered Dataset Writes: @PARALLEL_FILTERED_WRITES@
                      API Tracing: @HDF5_ENABLE_TRACE@
             Using memory checker: @HDF5_ENABLE_USING_MEMCHECKER@
  Memory allocation sanity checks: @HDF5_MEMORY_ALLOC_SANITY_CHECK@
-             Metadata trace file: @METADATATRACEFILE@
           Function Stack Tracing: @HDF5_ENABLE_CODESTACK@
        Strict File Format Checks: @HDF5_STRICT_FORMAT_CHECKS@
     Optimization Instrumentation: @HDF5_Enable_Instrument@
diff --git a/config/cmake/scripts/CTestScript.cmake b/config/cmake/scripts/CTestScript.cmake
index 9534b1e..eb466d2 100755..100644
--- a/config/cmake/scripts/CTestScript.cmake
+++ b/config/cmake/scripts/CTestScript.cmake
@@ -9,266 +9,275 @@
 # If you do not have access to either file, you may request a copy from
 # help@hdfgroup.org.
 #
-cmake_minimum_required (VERSION 3.10)

-########################################################

-# This dashboard is maintained by The HDF Group

-# For any comments please contact cdashhelp@hdfgroup.org

-#

-########################################################

-# -----------------------------------------------------------

-# -- Get environment

-# -----------------------------------------------------------

-if (NOT SITE_OS_NAME)

-  ## machine name not provided - attempt to discover with uname

-  ## -- set hostname

-  ## --------------------------

-  find_program (HOSTNAME_CMD NAMES hostname)

-  exec_program (${HOSTNAME_CMD} ARGS OUTPUT_VARIABLE HOSTNAME)

-  set (CTEST_SITE  "${HOSTNAME}${CTEST_SITE_EXT}")

-  find_program (UNAME NAMES uname)

-  macro (getuname name flag)

-    exec_program ("${UNAME}" ARGS "${flag}" OUTPUT_VARIABLE "${name}")

-  endmacro ()

-

-  getuname (osname -s)

-  getuname (osrel  -r)

-  getuname (cpu    -m)

-  message (STATUS "Dashboard script uname output: ${osname}-${osrel}-${cpu}\n")

-

-  set (CTEST_BUILD_NAME  "${osname}-${osrel}-${cpu}")

-else ()

-  ## machine name provided

-  ## --------------------------

-  if (CMAKE_HOST_UNIX)

-    set (CTEST_BUILD_NAME "${SITE_OS_NAME}-${SITE_OS_VERSION}-${SITE_OS_BITS}-${SITE_COMPILER_NAME}-${SITE_COMPILER_VERSION}")

-  else ()

-    set (CTEST_BUILD_NAME "${SITE_OS_NAME}-${SITE_OS_VERSION}-${SITE_COMPILER_NAME}")

-  endif ()

-endif ()

+cmake_minimum_required (VERSION 3.10)
+########################################################
+# This dashboard is maintained by The HDF Group
+# For any comments please contact cdashhelp@hdfgroup.org
+#
+########################################################
+# -----------------------------------------------------------
+# -- Get environment
+# -----------------------------------------------------------
+if (NOT SITE_OS_NAME)
+  ## machine name not provided - attempt to discover with uname
+  ## -- set hostname
+  ## --------------------------
+  find_program (HOSTNAME_CMD NAMES hostname)
+  exec_program (${HOSTNAME_CMD} ARGS OUTPUT_VARIABLE HOSTNAME)
+  set (CTEST_SITE  "${HOSTNAME}${CTEST_SITE_EXT}")
+  find_program (UNAME NAMES uname)
+  macro (getuname name flag)
+    exec_program ("${UNAME}" ARGS "${flag}" OUTPUT_VARIABLE "${name}")
+  endmacro ()
+
+  getuname (osname -s)
+  getuname (osrel  -r)
+  getuname (cpu    -m)
+  message (STATUS "Dashboard script uname output: ${osname}-${osrel}-${cpu}\n")
+
+  set (CTEST_BUILD_NAME  "${osname}-${osrel}-${cpu}")
+else ()
+  ## machine name provided
+  ## --------------------------
+  if (CMAKE_HOST_UNIX)
+    set (CTEST_BUILD_NAME "${SITE_OS_NAME}-${SITE_OS_VERSION}-${SITE_OS_BITS}-${SITE_COMPILER_NAME}-${SITE_COMPILER_VERSION}")
+  else ()
+    set (CTEST_BUILD_NAME "${SITE_OS_NAME}-${SITE_OS_VERSION}-${SITE_COMPILER_NAME}")
+  endif ()
+endif ()
 if (SITE_BUILDNAME_SUFFIX)
   set (CTEST_BUILD_NAME  "${SITE_BUILDNAME_SUFFIX}-${CTEST_BUILD_NAME}")
 endif ()
 set (BUILD_OPTIONS "${ADD_BUILD_OPTIONS} -DSITE:STRING=${CTEST_SITE} -DBUILDNAME:STRING=${CTEST_BUILD_NAME}")
-

-#-----------------------------------------------------------------------------

-# MAC machines need special option

-#-----------------------------------------------------------------------------

-if (APPLE)

-  # Compiler choice

-  execute_process (COMMAND xcrun --find cc OUTPUT_VARIABLE XCODE_CC OUTPUT_STRIP_TRAILING_WHITESPACE)

-  execute_process (COMMAND xcrun --find c++ OUTPUT_VARIABLE XCODE_CXX OUTPUT_STRIP_TRAILING_WHITESPACE)

-  set (ENV{CC} "${XCODE_CC}")

-  set (ENV{CXX} "${XCODE_CXX}")

-

-  set (BUILD_OPTIONS "${BUILD_OPTIONS} -DCTEST_USE_LAUNCHERS:BOOL=ON -DCMAKE_BUILD_WITH_INSTALL_RPATH:BOOL=OFF")

-endif ()

-

-#-----------------------------------------------------------------------------

-set (NEED_REPOSITORY_CHECKOUT 0)

-set (CTEST_CMAKE_COMMAND "\"${CMAKE_COMMAND}\"")

-if (CTEST_USE_TAR_SOURCE)

-  ## Uncompress source if tar file provided

-  ## --------------------------

-  if (WIN32)

-    message (STATUS "extracting... [${CMAKE_EXECUTABLE_NAME} x ${CTEST_DASHBOARD_ROOT}\\${CTEST_USE_TAR_SOURCE}.zip]")

-    execute_process (COMMAND ${CMAKE_EXECUTABLE_NAME} -E tar -xvf ${CTEST_DASHBOARD_ROOT}\\${CTEST_USE_TAR_SOURCE}.zip RESULT_VARIABLE rv)

-  else ()

-    message (STATUS "extracting... [${CMAKE_EXECUTABLE_NAME} -E tar -xvf ${CTEST_DASHBOARD_ROOT}/${CTEST_USE_TAR_SOURCE}.tar]")

-    execute_process (COMMAND ${CMAKE_EXECUTABLE_NAME} -E tar -xvf ${CTEST_DASHBOARD_ROOT}/${CTEST_USE_TAR_SOURCE}.tar RESULT_VARIABLE rv)

-  endif ()

-

-  if (NOT rv EQUAL 0)

-    message (STATUS "extracting... [error-(${rv}) clean up]")

-    file (REMOVE_RECURSE "${CTEST_SOURCE_DIRECTORY}")

-    message (FATAL_ERROR "error: extract of ${CTEST_USE_TAR_SOURCE} failed")

-  endif ()

-

-  file (RENAME ${CTEST_DASHBOARD_ROOT}/${CTEST_USE_TAR_SOURCE} ${CTEST_SOURCE_DIRECTORY})

-  set (LOCAL_SKIP_UPDATE "TRUE")

-else ()

-  if (LOCAL_UPDATE)

-    if (CTEST_USE_GIT_SOURCE)

-      find_program (CTEST_GIT_COMMAND NAMES git git.cmd)

-      set (CTEST_GIT_UPDATE_OPTIONS)

-

-      if (NOT EXISTS "${CTEST_SOURCE_DIRECTORY}")

-        set (NEED_REPOSITORY_CHECKOUT 1)

-      endif ()

-

-      if (${NEED_REPOSITORY_CHECKOUT})

-        if (REPOSITORY_BRANCH)

-          set (CTEST_GIT_options "clone \"${REPOSITORY_URL}\" --branch  \"${REPOSITORY_BRANCH}\" --single-branch \"${CTEST_SOURCE_DIRECTORY}\" --recurse-submodules")

-        else ()

-          set (CTEST_GIT_options "clone \"${REPOSITORY_URL}\" \"${CTEST_SOURCE_DIRECTORY}\" --recurse-submodules")

-        endif ()

-        set (CTEST_CHECKOUT_COMMAND "${CTEST_GIT_COMMAND} ${CTEST_GIT_options}")

-      else ()

-        set (CTEST_GIT_options "pull")

-      endif ()

-      set (CTEST_UPDATE_COMMAND "${CTEST_GIT_COMMAND}")

-    else ()

-      ## --------------------------

-      ## use subversion to get source

-      #-----------------------------------------------------------------------------

-      ## cygwin does not handle the find_package() call

-      ## --------------------------

-      set (CTEST_UPDATE_COMMAND "SVNCommand")

-      if (NOT SITE_CYGWIN})

-        find_package (Subversion)

-        set (CTEST_SVN_COMMAND "${Subversion_SVN_EXECUTABLE}")

-        set (CTEST_UPDATE_COMMAND "${Subversion_SVN_EXECUTABLE}")

-      else ()

-        set (CTEST_SVN_COMMAND "/usr/bin/svn")

-        set (CTEST_UPDATE_COMMAND "/usr/bin/svn")

-      endif ()

-

-      if (NOT EXISTS "${CTEST_SOURCE_DIRECTORY}")

-        set (NEED_REPOSITORY_CHECKOUT 1)

-      endif ()

-

-      if (NOT CTEST_REPO_VERSION)

-        set (CTEST_REPO_VERSION "HEAD")

-      endif ()

-      if (${NEED_REPOSITORY_CHECKOUT})

-        set (CTEST_CHECKOUT_COMMAND

-            "\"${CTEST_SVN_COMMAND}\" co ${REPOSITORY_URL} \"${CTEST_SOURCE_DIRECTORY}\" -r ${CTEST_REPO_VERSION}")

-      else ()

-        if (CTEST_REPO_VERSION)

-          set (CTEST_SVN_UPDATE_OPTIONS "-r ${CTEST_REPO_VERSION}")

-        endif ()

-      endif ()

-    endif ()

-  endif ()

-endif ()

-

-#-----------------------------------------------------------------------------

-## Clear the build directory

-## --------------------------

-set (CTEST_START_WITH_EMPTY_BINARY_DIRECTORY TRUE)

-if (NOT EXISTS "${CTEST_BINARY_DIRECTORY}")

-  file (MAKE_DIRECTORY "${CTEST_BINARY_DIRECTORY}")

-else ()

-  ctest_empty_binary_directory (${CTEST_BINARY_DIRECTORY})

-endif ()

-

-# Use multiple CPU cores to build

-include (ProcessorCount)

-ProcessorCount (N)

+
+#-----------------------------------------------------------------------------
+# MAC machines need special option
+#-----------------------------------------------------------------------------
+if (APPLE)
+  # Compiler choice
+  execute_process (COMMAND xcrun --find cc OUTPUT_VARIABLE XCODE_CC OUTPUT_STRIP_TRAILING_WHITESPACE)
+  execute_process (COMMAND xcrun --find c++ OUTPUT_VARIABLE XCODE_CXX OUTPUT_STRIP_TRAILING_WHITESPACE)
+  set (ENV{CC} "${XCODE_CC}")
+  set (ENV{CXX} "${XCODE_CXX}")
+
+  set (BUILD_OPTIONS "${BUILD_OPTIONS} -DCTEST_USE_LAUNCHERS:BOOL=ON -DCMAKE_BUILD_WITH_INSTALL_RPATH:BOOL=OFF")
+endif ()
+
+#-----------------------------------------------------------------------------
+set (NEED_REPOSITORY_CHECKOUT 0)
+set (CTEST_CMAKE_COMMAND "\"${CMAKE_COMMAND}\"")
+if (CTEST_USE_TAR_SOURCE)
+  ## Uncompress source if tar file provided
+  ## --------------------------
+  if (WIN32)
+    message (STATUS "extracting... [${CMAKE_EXECUTABLE_NAME} x ${CTEST_DASHBOARD_ROOT}\\${CTEST_USE_TAR_SOURCE}.zip]")
+    execute_process (COMMAND ${CMAKE_EXECUTABLE_NAME} -E tar -xvf ${CTEST_DASHBOARD_ROOT}\\${CTEST_USE_TAR_SOURCE}.zip RESULT_VARIABLE rv)
+  else ()
+    message (STATUS "extracting... [${CMAKE_EXECUTABLE_NAME} -E tar -xvf ${CTEST_DASHBOARD_ROOT}/${CTEST_USE_TAR_SOURCE}.tar]")
+    execute_process (COMMAND ${CMAKE_EXECUTABLE_NAME} -E tar -xvf ${CTEST_DASHBOARD_ROOT}/${CTEST_USE_TAR_SOURCE}.tar RESULT_VARIABLE rv)
+  endif ()
+
+  if (NOT rv EQUAL 0)
+    message (STATUS "extracting... [error-(${rv}) clean up]")
+    file (REMOVE_RECURSE "${CTEST_SOURCE_DIRECTORY}")
+    message (FATAL_ERROR "error: extract of ${CTEST_USE_TAR_SOURCE} failed")
+  endif ()
+
+  file (RENAME ${CTEST_DASHBOARD_ROOT}/${CTEST_USE_TAR_SOURCE} ${CTEST_SOURCE_DIRECTORY})
+  set (LOCAL_SKIP_UPDATE "TRUE")
+else ()
+  if (LOCAL_UPDATE)
+    if (CTEST_USE_GIT_SOURCE)
+      find_program (CTEST_GIT_COMMAND NAMES git git.cmd)
+      set (CTEST_GIT_UPDATE_OPTIONS)
+
+      if (NOT EXISTS "${CTEST_SOURCE_DIRECTORY}")
+        set (NEED_REPOSITORY_CHECKOUT 1)
+      endif ()
+
+      if (${NEED_REPOSITORY_CHECKOUT})
+        if (REPOSITORY_BRANCH)
+          set (CTEST_GIT_options "clone \"${REPOSITORY_URL}\" --branch  \"${REPOSITORY_BRANCH}\" --single-branch \"${CTEST_SOURCE_DIRECTORY}\" --recurse-submodules")
+        else ()
+          set (CTEST_GIT_options "clone \"${REPOSITORY_URL}\" \"${CTEST_SOURCE_DIRECTORY}\" --recurse-submodules")
+        endif ()
+        set (CTEST_CHECKOUT_COMMAND "${CTEST_GIT_COMMAND} ${CTEST_GIT_options}")
+      else ()
+        set (CTEST_GIT_options "pull")
+      endif ()
+      set (CTEST_UPDATE_COMMAND "${CTEST_GIT_COMMAND}")
+    else ()
+      ## --------------------------
+      ## use subversion to get source
+      #-----------------------------------------------------------------------------
+      ## cygwin does not handle the find_package() call
+      ## --------------------------
+      set (CTEST_UPDATE_COMMAND "SVNCommand")
+      if (NOT SITE_CYGWIN})
+        find_package (Subversion)
+        set (CTEST_SVN_COMMAND "${Subversion_SVN_EXECUTABLE}")
+        set (CTEST_UPDATE_COMMAND "${Subversion_SVN_EXECUTABLE}")
+      else ()
+        set (CTEST_SVN_COMMAND "/usr/bin/svn")
+        set (CTEST_UPDATE_COMMAND "/usr/bin/svn")
+      endif ()
+
+      if (NOT EXISTS "${CTEST_SOURCE_DIRECTORY}")
+        set (NEED_REPOSITORY_CHECKOUT 1)
+      endif ()
+
+      if (NOT CTEST_REPO_VERSION)
+        set (CTEST_REPO_VERSION "HEAD")
+      endif ()
+      if (${NEED_REPOSITORY_CHECKOUT})
+        set (CTEST_CHECKOUT_COMMAND
+            "\"${CTEST_SVN_COMMAND}\" co ${REPOSITORY_URL} \"${CTEST_SOURCE_DIRECTORY}\" -r ${CTEST_REPO_VERSION}")
+      else ()
+        if (CTEST_REPO_VERSION)
+          set (CTEST_SVN_UPDATE_OPTIONS "-r ${CTEST_REPO_VERSION}")
+        endif ()
+      endif ()
+    endif ()
+  endif ()
+endif ()
+
+#-----------------------------------------------------------------------------
+## Clear the build directory
+## --------------------------
+set (CTEST_START_WITH_EMPTY_BINARY_DIRECTORY TRUE)
+if (NOT EXISTS "${CTEST_BINARY_DIRECTORY}")
+  file (MAKE_DIRECTORY "${CTEST_BINARY_DIRECTORY}")
+else ()
+  ctest_empty_binary_directory (${CTEST_BINARY_DIRECTORY})
+endif ()
+
+# Use multiple CPU cores to build
+include (ProcessorCount)
+ProcessorCount (N)
 if (NOT N EQUAL 0)
   if (MAX_PROC_COUNT)
     if (N GREATER MAX_PROC_COUNT)
       set (N ${MAX_PROC_COUNT})
     endif ()
   endif ()
-  if (NOT WIN32)

-    set (CTEST_BUILD_FLAGS -j${N})

-  endif ()

-  set (ctest_test_args ${ctest_test_args} PARALLEL_LEVEL ${N})

-endif ()

-

-#-----------------------------------------------------------------------------

-# Send the main script as a note.

-list (APPEND CTEST_NOTES_FILES

-    "${CTEST_SCRIPT_DIRECTORY}/${CTEST_SCRIPT_NAME}"

-    "${CMAKE_CURRENT_LIST_FILE}"

-    "${CTEST_SOURCE_DIRECTORY}/config/cmake/cacheinit.cmake"

-)

-

-#-----------------------------------------------------------------------------

-# Check for required variables.

-# --------------------------

-foreach (req

-    CTEST_CMAKE_GENERATOR

-    CTEST_SITE

-    CTEST_BUILD_NAME

-  )

-  if (NOT DEFINED ${req})

-    message (FATAL_ERROR "The containing script must set ${req}")

-  endif ()

-endforeach ()

-

-#-----------------------------------------------------------------------------

-# Initialize the CTEST commands

-#------------------------------

-if (CMAKE_GENERATOR_TOOLSET)

-  set (CTEST_CONFIGURE_TOOLSET  "-T${CMAKE_GENERATOR_TOOLSET}")

-else ()

-  set (CTEST_CONFIGURE_TOOLSET  "")

-endif()

-if (LOCAL_MEMCHECK_TEST)

-  find_program (CTEST_MEMORYCHECK_COMMAND NAMES valgrind)

-  set (CTEST_CONFIGURE_COMMAND

-      "${CTEST_CMAKE_COMMAND} -C \"${CTEST_SOURCE_DIRECTORY}/config/cmake/mccacheinit.cmake\" -DCMAKE_BUILD_TYPE:STRING=${CTEST_CONFIGURATION_TYPE} ${BUILD_OPTIONS} \"-G${CTEST_CMAKE_GENERATOR}\" \"${CTEST_CONFIGURE_TOOLSET}\" \"${CTEST_SOURCE_DIRECTORY}\""

-  )

-else ()

-  if (LOCAL_COVERAGE_TEST)

-    find_program (CTEST_COVERAGE_COMMAND NAMES gcov)

-  endif ()

-  set (CTEST_CONFIGURE_COMMAND

-      "${CTEST_CMAKE_COMMAND} -C \"${CTEST_SOURCE_DIRECTORY}/config/cmake/cacheinit.cmake\" -DCMAKE_BUILD_TYPE:STRING=${CTEST_CONFIGURATION_TYPE} ${BUILD_OPTIONS} \"-G${CTEST_CMAKE_GENERATOR}\" \"${CTEST_CONFIGURE_TOOLSET}\" \"${CTEST_SOURCE_DIRECTORY}\""

-  )

-endif ()

-

-#-----------------------------------------------------------------------------

-## -- set output to english

-set ($ENV{LC_MESSAGES}  "en_EN")

-

-# Print summary information.

-foreach (v

-    CTEST_SITE

-    CTEST_BUILD_NAME

-    CTEST_SOURCE_DIRECTORY

-    CTEST_BINARY_DIRECTORY

-    CTEST_CMAKE_GENERATOR

-    CTEST_CONFIGURATION_TYPE

-    CTEST_GIT_COMMAND

-    CTEST_CHECKOUT_COMMAND

-    CTEST_CONFIGURE_COMMAND

-    CTEST_SCRIPT_DIRECTORY

-    CTEST_USE_LAUNCHERS

-  )

-  set (vars "${vars}  ${v}=[${${v}}]\n")

-endforeach ()

-message (STATUS "Dashboard script configuration:\n${vars}\n")

-

-#-----------------------------------------------------------------------------

-#-----------------------------------------------------------------------------

-  ## NORMAL process

-  ## -- LOCAL_UPDATE updates the source folder from svn

-  ## -- LOCAL_SUBMIT reports to CDash server

-  ## -- LOCAL_SKIP_TEST skips the test process (only builds)

-  ## -- LOCAL_MEMCHECK_TEST executes the Valgrind testing

-  ## -- LOCAL_COVERAGE_TEST executes code coverage process

-  ## --------------------------

-  ctest_start (${MODEL} TRACK ${MODEL})

-  if (LOCAL_UPDATE)

-    ctest_update (SOURCE "${CTEST_SOURCE_DIRECTORY}")

-  endif ()

-  configure_file (${CTEST_SOURCE_DIRECTORY}/config/cmake/CTestCustom.cmake ${CTEST_BINARY_DIRECTORY}/CTestCustom.cmake)

-  ctest_read_custom_files ("${CTEST_BINARY_DIRECTORY}")

-  ctest_configure (BUILD "${CTEST_BINARY_DIRECTORY}" RETURN_VALUE res)

-  if (LOCAL_SUBMIT)

-    ctest_submit (PARTS Update Configure Notes)

-  endif ()

-  if (${res} LESS 0 OR ${res} GREATER 0)

-    file (APPEND ${CTEST_SCRIPT_DIRECTORY}/FailedCTest.txt "Failed Configure: ${res}\n")

-  endif ()

-

-  ctest_build (BUILD "${CTEST_BINARY_DIRECTORY}" APPEND RETURN_VALUE res NUMBER_ERRORS errval)

-  if (LOCAL_SUBMIT)

-    ctest_submit (PARTS Build)

-  endif ()

-  if (${res} LESS 0 OR ${res} GREATER 0 OR ${errval} GREATER 0)

-    file (APPEND ${CTEST_SCRIPT_DIRECTORY}/FailedCTest.txt "Failed ${errval} Build: ${res}\n")

-  endif ()

-

-  if (NOT LOCAL_SKIP_TEST)

-    if (NOT LOCAL_MEMCHECK_TEST)

+  if (NOT WIN32)
+    set (CTEST_BUILD_FLAGS -j${N})
+  endif ()
+  set (ctest_test_args ${ctest_test_args} PARALLEL_LEVEL ${N})
+endif ()
+
+#-----------------------------------------------------------------------------
+# Send the main script as a note.
+list (APPEND CTEST_NOTES_FILES
+    "${CTEST_SCRIPT_DIRECTORY}/${CTEST_SCRIPT_NAME}"
+    "${CMAKE_CURRENT_LIST_FILE}"
+    "${CTEST_SOURCE_DIRECTORY}/config/cmake/cacheinit.cmake"
+)
+
+#-----------------------------------------------------------------------------
+# Check for required variables.
+# --------------------------
+foreach (req
+    CTEST_CMAKE_GENERATOR
+    CTEST_SITE
+    CTEST_BUILD_NAME
+  )
+  if (NOT DEFINED ${req})
+    message (FATAL_ERROR "The containing script must set ${req}")
+  endif ()
+endforeach ()
+
+#-----------------------------------------------------------------------------
+# Initialize the CTEST commands
+#------------------------------
+if (CMAKE_GENERATOR_TOOLSET)
+  set (CTEST_CONFIGURE_TOOLSET  "-T${CMAKE_GENERATOR_TOOLSET}")
+else ()
+  set (CTEST_CONFIGURE_TOOLSET  "")
+endif()
+if (LOCAL_MEMCHECK_TEST)
+  find_program (CTEST_MEMORYCHECK_COMMAND NAMES valgrind)
+  set (CTEST_CONFIGURE_COMMAND
+      "${CTEST_CMAKE_COMMAND} -C \"${CTEST_SOURCE_DIRECTORY}/config/cmake/mccacheinit.cmake\" -DCMAKE_BUILD_TYPE:STRING=${CTEST_CONFIGURATION_TYPE} ${BUILD_OPTIONS} \"-G${CTEST_CMAKE_GENERATOR}\" \"${CTEST_CONFIGURE_TOOLSET}\" \"${CTEST_SOURCE_DIRECTORY}\""
+  )
+else ()
+  if (LOCAL_COVERAGE_TEST)
+    find_program (CTEST_COVERAGE_COMMAND NAMES gcov)
+  endif ()
+  set (CTEST_CONFIGURE_COMMAND
+      "${CTEST_CMAKE_COMMAND} -C \"${CTEST_SOURCE_DIRECTORY}/config/cmake/cacheinit.cmake\" -DCMAKE_BUILD_TYPE:STRING=${CTEST_CONFIGURATION_TYPE} ${BUILD_OPTIONS} \"-G${CTEST_CMAKE_GENERATOR}\" \"${CTEST_CONFIGURE_TOOLSET}\" \"${CTEST_SOURCE_DIRECTORY}\""
+  )
+endif ()
+
+#-----------------------------------------------------------------------------
+## -- set output to english
+set ($ENV{LC_MESSAGES}  "en_EN")
+
+# Print summary information.
+foreach (v
+    CTEST_SITE
+    CTEST_BUILD_NAME
+    CTEST_SOURCE_DIRECTORY
+    CTEST_BINARY_DIRECTORY
+    CTEST_CMAKE_GENERATOR
+    CTEST_CONFIGURATION_TYPE
+    CTEST_GIT_COMMAND
+    CTEST_CHECKOUT_COMMAND
+    CTEST_CONFIGURE_COMMAND
+    CTEST_SCRIPT_DIRECTORY
+    CTEST_USE_LAUNCHERS
+  )
+  set (vars "${vars}  ${v}=[${${v}}]\n")
+endforeach ()
+message (STATUS "Dashboard script configuration:\n${vars}\n")
+
+#-----------------------------------------------------------------------------
+#-----------------------------------------------------------------------------
+  ## NORMAL process
+  ## -- LOCAL_UPDATE updates the source folder from svn
+  ## -- LOCAL_SUBMIT reports to CDash server
+  ## -- LOCAL_SKIP_TEST skips the test process (only builds)
+  ## -- LOCAL_MEMCHECK_TEST executes the Valgrind testing
+  ## -- LOCAL_COVERAGE_TEST executes code coverage process
+  ## --------------------------
+  ctest_start (${MODEL} TRACK ${MODEL})
+  if (LOCAL_UPDATE)
+    ctest_update (SOURCE "${CTEST_SOURCE_DIRECTORY}")
+  endif ()
+  configure_file (${CTEST_SOURCE_DIRECTORY}/config/cmake/CTestCustom.cmake ${CTEST_BINARY_DIRECTORY}/CTestCustom.cmake)
+  ctest_read_custom_files ("${CTEST_BINARY_DIRECTORY}")
+  ctest_configure (BUILD "${CTEST_BINARY_DIRECTORY}" RETURN_VALUE res)
+  if (LOCAL_SUBMIT)
+    ctest_submit (PARTS Update Configure Notes)
+  endif ()
+  if (${res} LESS 0 OR ${res} GREATER 0)
+    file (APPEND ${CTEST_SCRIPT_DIRECTORY}/FailedCTest.txt "Failed Configure: ${res}\n")
+  endif ()
+
+  # On Cray XC40, configuring fails in the Fortran section when using the craype-mic-knl module.
+  # When the configure phase is done with the craype-haswell module and the build phase is done
+  # with the craype-mic-knl module, configure succeeds and tests pass on the knl compute nodes
+  # for Intel, Cray, GCC and Clang compilers.  If the variables aren't set or if not 
+  # cross compiling, the module switch will not occur.
+  if (CMAKE_CROSSCOMPILING AND COMPILENODE_HWCOMPILE_MODULE AND COMPUTENODE_HWCOMPILE_MODULE)
+      execute_process (COMMAND module switch ${COMPILENODE_HWCOMPILE_MODULE} ${COMPUTENODE_HWCOMPILE_MODULE})
+  endif ()
+
+  ctest_build (BUILD "${CTEST_BINARY_DIRECTORY}" APPEND RETURN_VALUE res NUMBER_ERRORS errval)
+  if (LOCAL_SUBMIT)
+    ctest_submit (PARTS Build)
+  endif ()
+  if (${res} LESS 0 OR ${res} GREATER 0 OR ${errval} GREATER 0)
+    file (APPEND ${CTEST_SCRIPT_DIRECTORY}/FailedCTest.txt "Failed ${errval} Build: ${res}\n")
+  endif ()
+
+  if (NOT LOCAL_SKIP_TEST)
+    if (NOT LOCAL_MEMCHECK_TEST)
       if (NOT LOCAL_BATCH_TEST)
         ctest_test (BUILD "${CTEST_BINARY_DIRECTORY}" APPEND ${ctest_test_args} RETURN_VALUE res)
       else ()
         file(STRINGS ${CTEST_BINARY_DIRECTORY}/Testing/TAG TAG_CONTENTS REGEX "^2([0-9]+)[-]([0-9]+)$")
-        execute_process (COMMAND ${LOCAL_BATCH_SCRIPT_COMMAND} ${CTEST_SOURCE_DIRECTORY}/bin/batch/${LOCAL_BATCH_SCRIPT_NAME})
+        execute_process (COMMAND ${LOCAL_BATCH_SCRIPT_COMMAND} ${CTEST_BINARY_DIRECTORY}/${LOCAL_BATCH_SCRIPT_NAME})
         message(STATUS "Check for existence of ${CTEST_BINARY_DIRECTORY}/Testing/${TAG_CONTENTS}/Test.xml")
         execute_process(COMMAND ls ${CTEST_BINARY_DIRECTORY}/Testing/${TAG_CONTENTS}/Test.xml RESULT_VARIABLE result OUTPUT_QUIET ERROR_QUIET)
         while(result)
@@ -281,8 +290,9 @@ message (STATUS "Dashboard script configuration:\n${vars}\n")
           endif ()
           message(STATUS "Found ${CTEST_BINARY_DIRECTORY}/Testing/${TAG_CONTENTS}/Test.xml for serial tests. Renaming to SerialTest.xml")
           file (RENAME ${CTEST_BINARY_DIRECTORY}/Testing/${TAG_CONTENTS}/Test.xml ${CTEST_BINARY_DIRECTORY}/Testing/${TAG_CONTENTS}/SerialTest.xml)
+          file (RENAME ${CTEST_BINARY_DIRECTORY}/Testing/Temporary/LastTest_${TAG_CONTENTS}.log ${CTEST_BINARY_DIRECTORY}/Testing/Temporary/LastTest_${TAG_CONTENTS}_Serial.log)
           unset(result CACHE)
-          execute_process (COMMAND ${LOCAL_BATCH_SCRIPT_COMMAND} ${CTEST_SOURCE_DIRECTORY}/bin/batch/${LOCAL_BATCH_SCRIPT_PARALLEL_NAME})
+          execute_process (COMMAND ${LOCAL_BATCH_SCRIPT_COMMAND} ${CTEST_BINARY_DIRECTORY}/${LOCAL_BATCH_SCRIPT_PARALLEL_NAME})
           message(STATUS "Check for existence of ${CTEST_BINARY_DIRECTORY}/Testing/${TAG_CONTENTS}/Test.xml")
           execute_process(COMMAND ls ${CTEST_BINARY_DIRECTORY}/Testing/${TAG_CONTENTS}/Test.xml RESULT_VARIABLE result OUTPUT_QUIET ERROR_QUIET)
           while(result)
diff --git a/config/cmake/scripts/HDF5config.cmake b/config/cmake/scripts/HDF5config.cmake
index dd3b17c..dd3b17c 100755..100644
--- a/config/cmake/scripts/HDF5config.cmake
+++ b/config/cmake/scripts/HDF5config.cmake
diff --git a/config/cmake/scripts/HDF5options.cmake b/config/cmake/scripts/HDF5options.cmake
index 6d1a57a..d4cc996 100755..100644
--- a/config/cmake/scripts/HDF5options.cmake
+++ b/config/cmake/scripts/HDF5options.cmake
@@ -58,12 +58,13 @@ set (ADD_BUILD_OPTIONS "${ADD_BUILD_OPTIONS} -DHDF5_ALLOW_EXTERNAL_SUPPORT:STRIN
 ### ext libs from git
 #set (ADD_BUILD_OPTIONS "${ADD_BUILD_OPTIONS} -DHDF5_ALLOW_EXTERNAL_SUPPORT:STRING=GIT")
 ### ext libs on system
+#set (ADD_BUILD_OPTIONS "${ADD_BUILD_OPTIONS} -DHDF5_ALLOW_EXTERNAL_SUPPORT:STRING=NO")
 #set (ADD_BUILD_OPTIONS "${ADD_BUILD_OPTIONS} -DZLIB_LIBRARY:FILEPATH=some_location/lib/zlib.lib -DZLIB_INCLUDE_DIR:PATH=some_location/include")
 #set (ADD_BUILD_OPTIONS "${ADD_BUILD_OPTIONS} -DSZIP_LIBRARY:FILEPATH=some_location/lib/szlib.lib -DSZIP_INCLUDE_DIR:PATH=some_location/include")
 
-### disable ext zlib building
+### disable using ext zlib
 #set (ADD_BUILD_OPTIONS "${ADD_BUILD_OPTIONS} -DHDF5_ENABLE_Z_LIB_SUPPORT:BOOL=OFF")
-### disable ext szip building
+### disable using ext szip
 #set (ADD_BUILD_OPTIONS "${ADD_BUILD_OPTIONS} -DHDF5_ENABLE_SZIP_SUPPORT:BOOL=OFF")
 #set (ADD_BUILD_OPTIONS "${ADD_BUILD_OPTIONS} -DHDF5_ENABLE_SZIP_ENCODING:BOOL=OFF")
 
diff --git a/config/cmake/vfdTest.cmake b/config/cmake/vfdTest.cmake
index 66a97c0..95a4c40 100644
--- a/config/cmake/vfdTest.cmake
+++ b/config/cmake/vfdTest.cmake
@@ -32,9 +32,9 @@ if (EXISTS ${TEST_FOLDER}/${TEST_OUTPUT}.err)
 endif ()
 
 # if there is not an error reference file add the error output to the stdout file
-if (NOT TEST_ERRREF)
-  set (ERROR_APPEND 1)
-endif ()
+#if (NOT TEST_ERRREF)
+#  set (ERROR_APPEND 1)
+#endif ()
 
 message (STATUS "USING ${TEST_VFD} ON COMMAND: ${TEST_PROGRAM} ${TEST_ARGS}")
 
diff --git a/config/cmake/volTest.cmake b/config/cmake/volTest.cmake
new file mode 100644
index 0000000..27da8a5
--- /dev/null
+++ b/config/cmake/volTest.cmake
@@ -0,0 +1,76 @@
+#
+# Copyright by The HDF Group.
+# All rights reserved.
+#
+# This file is part of HDF5.  The full HDF5 copyright notice, including
+# terms governing use, modification, and redistribution, is contained in
+# the COPYING file, which can be found at the root of the source code
+# distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.
+# If you do not have access to either file, you may request a copy from
+# help@hdfgroup.org.
+#
+# volTest.cmake executes a command and captures the output in a file. Command uses specified VOL.
+# Exit status of command can also be compared.
+
+# arguments checking
+if (NOT TEST_PROGRAM)
+  message (FATAL_ERROR "Require TEST_PROGRAM to be defined")
+endif ()
+if (NOT TEST_FOLDER)
+  message ( FATAL_ERROR "Require TEST_FOLDER to be defined")
+endif ()
+if (NOT TEST_VOL)
+  message (FATAL_ERROR "Require TEST_VOL to be defined")
+endif ()
+
+if (EXISTS ${TEST_FOLDER}/${TEST_OUTPUT})
+  file (REMOVE ${TEST_FOLDER}/${TEST_OUTPUT})
+endif ()
+
+if (EXISTS ${TEST_FOLDER}/${TEST_OUTPUT}.err)
+  file (REMOVE ${TEST_FOLDER}/${TEST_OUTPUT}.err)
+endif ()
+
+# if there is not an error reference file add the error output to the stdout file
+#if (NOT TEST_ERRREF)
+#  set (ERROR_APPEND 1)
+#endif ()
+
+message (STATUS "USING ${TEST_VOL} ON COMMAND: ${TEST_PROGRAM} ${TEST_ARGS}")
+
+set (ENV{HDF5_VOL_CONNECTOR} "${TEST_VOL}")
+
+# run the test program, capture the stdout/stderr and the result var
+execute_process (
+    COMMAND ${TEST_PROGRAM} ${TEST_ARGS}
+    WORKING_DIRECTORY ${TEST_FOLDER}
+    RESULT_VARIABLE TEST_RESULT
+    OUTPUT_FILE ${TEST_OUTPUT}.out
+    ERROR_FILE ${TEST_OUTPUT}.err
+    OUTPUT_VARIABLE TEST_OUT
+    ERROR_VARIABLE TEST_ERROR
+)
+
+message (STATUS "COMMAND Result: ${TEST_RESULT}")
+
+# if the .err file exists and ERRROR_APPEND is enabled
+if (ERROR_APPEND AND EXISTS ${TEST_FOLDER}/${TEST_OUTPUT}.err)
+  file (READ ${TEST_FOLDER}/${TEST_OUTPUT}.err TEST_STREAM)
+  file (APPEND ${TEST_FOLDER}/${TEST_OUTPUT}.out "${TEST_STREAM}")
+endif ()
+
+# if the return value is !=${TEST_EXPECT} bail out
+if (NOT "${TEST_RESULT}" STREQUAL "${TEST_EXPECT}")
+  if (NOT TEST_NOERRDISPLAY)
+    if (EXISTS ${TEST_FOLDER}/${TEST_OUTPUT}.out)
+      file (READ ${TEST_FOLDER}/${TEST_OUTPUT}.out TEST_STREAM)
+    message (STATUS "Output USING ${TEST_VOL}:\n${TEST_STREAM}")
+    endif ()
+  endif ()
+  message (FATAL_ERROR "Failed: Test program ${TEST_PROGRAM} exited != ${TEST_EXPECT}.\n${TEST_ERROR}")
+endif ()
+
+message (STATUS "COMMAND Error: ${TEST_ERROR}")
+
+# everything went fine...
+message ("Passed: The ${TEST_PROGRAM} program used vol ${TEST_VOL}")
diff --git a/config/cmake_ext_mod/ConfigureChecks.cmake b/config/cmake_ext_mod/ConfigureChecks.cmake
index 40f1440..c24c1f8 100644
--- a/config/cmake_ext_mod/ConfigureChecks.cmake
+++ b/config/cmake_ext_mod/ConfigureChecks.cmake
@@ -70,7 +70,7 @@ if (WIN32)
     set (CMAKE_REQUIRED_FLAGS "-DWIN32_LEAN_AND_MEAN=1 -DNOGDI=1")
   endif ()
   set (${HDF_PREFIX}_HAVE_WIN32_API 1)
-  set (CMAKE_REQUIRED_LIBRARIES "ws2_32.lib;wsock32.lib")
+  set (HDF5_REQUIRED_LIBRARIES "ws2_32.lib;wsock32.lib")
   if (NOT UNIX AND NOT MINGW)
     set (WINDOWS 1)
     set (CMAKE_REQUIRED_FLAGS "/DWIN32_LEAN_AND_MEAN=1 /DNOGDI=1")
@@ -109,6 +109,78 @@ endif ()
 # END of WINDOWS Hard code Values
 # ----------------------------------------------------------------------
 
+if (NOT WINDOWS)
+  TEST_BIG_ENDIAN (${HDF_PREFIX}_WORDS_BIGENDIAN)
+endif ()
+
+#-----------------------------------------------------------------------------
+# Check IF header file exists and add it to the list.
+#-----------------------------------------------------------------------------
+macro (CHECK_INCLUDE_FILE_CONCAT FILE VARIABLE)
+  CHECK_INCLUDE_FILES ("${USE_INCLUDES};${FILE}" ${VARIABLE})
+  if (${VARIABLE})
+    set (USE_INCLUDES ${USE_INCLUDES} ${FILE})
+  endif ()
+endmacro ()
+
+#-----------------------------------------------------------------------------
+#  Check for the existence of certain header files
+#-----------------------------------------------------------------------------
+CHECK_INCLUDE_FILE_CONCAT ("sys/file.h"      ${HDF_PREFIX}_HAVE_SYS_FILE_H)
+CHECK_INCLUDE_FILE_CONCAT ("sys/ioctl.h"     ${HDF_PREFIX}_HAVE_SYS_IOCTL_H)
+CHECK_INCLUDE_FILE_CONCAT ("sys/resource.h"  ${HDF_PREFIX}_HAVE_SYS_RESOURCE_H)
+CHECK_INCLUDE_FILE_CONCAT ("sys/socket.h"    ${HDF_PREFIX}_HAVE_SYS_SOCKET_H)
+CHECK_INCLUDE_FILE_CONCAT ("sys/stat.h"      ${HDF_PREFIX}_HAVE_SYS_STAT_H)
+CHECK_INCLUDE_FILE_CONCAT ("sys/time.h"      ${HDF_PREFIX}_HAVE_SYS_TIME_H)
+CHECK_INCLUDE_FILE_CONCAT ("sys/types.h"     ${HDF_PREFIX}_HAVE_SYS_TYPES_H)
+CHECK_INCLUDE_FILE_CONCAT ("features.h"      ${HDF_PREFIX}_HAVE_FEATURES_H)
+CHECK_INCLUDE_FILE_CONCAT ("dirent.h"        ${HDF_PREFIX}_HAVE_DIRENT_H)
+CHECK_INCLUDE_FILE_CONCAT ("setjmp.h"        ${HDF_PREFIX}_HAVE_SETJMP_H)
+CHECK_INCLUDE_FILE_CONCAT ("stddef.h"        ${HDF_PREFIX}_HAVE_STDDEF_H)
+CHECK_INCLUDE_FILE_CONCAT ("stdint.h"        ${HDF_PREFIX}_HAVE_STDINT_H)
+CHECK_INCLUDE_FILE_CONCAT ("unistd.h"        ${HDF_PREFIX}_HAVE_UNISTD_H)
+
+# Darwin
+CHECK_INCLUDE_FILE_CONCAT ("mach/mach_time.h" ${HDF_PREFIX}_HAVE_MACH_MACH_TIME_H)
+
+# Windows
+CHECK_INCLUDE_FILE_CONCAT ("io.h"            ${HDF_PREFIX}_HAVE_IO_H)
+if (NOT CYGWIN)
+  CHECK_INCLUDE_FILE_CONCAT ("winsock2.h"      ${HDF_PREFIX}_HAVE_WINSOCK2_H)
+endif ()
+CHECK_INCLUDE_FILE_CONCAT ("sys/timeb.h"     ${HDF_PREFIX}_HAVE_SYS_TIMEB_H)
+
+if (CMAKE_SYSTEM_NAME MATCHES "OSF")
+  CHECK_INCLUDE_FILE_CONCAT ("sys/sysinfo.h" ${HDF_PREFIX}_HAVE_SYS_SYSINFO_H)
+  CHECK_INCLUDE_FILE_CONCAT ("sys/proc.h"    ${HDF_PREFIX}_HAVE_SYS_PROC_H)
+else ()
+  set (${HDF_PREFIX}_HAVE_SYS_SYSINFO_H "" CACHE INTERNAL "" FORCE)
+  set (${HDF_PREFIX}_HAVE_SYS_PROC_H    "" CACHE INTERNAL "" FORCE)
+endif ()
+
+CHECK_INCLUDE_FILE_CONCAT ("globus/common.h" ${HDF_PREFIX}_HAVE_GLOBUS_COMMON_H)
+CHECK_INCLUDE_FILE_CONCAT ("pdb.h"           ${HDF_PREFIX}_HAVE_PDB_H)
+CHECK_INCLUDE_FILE_CONCAT ("pthread.h"       ${HDF_PREFIX}_HAVE_PTHREAD_H)
+CHECK_INCLUDE_FILE_CONCAT ("srbclient.h"     ${HDF_PREFIX}_HAVE_SRBCLIENT_H)
+CHECK_INCLUDE_FILE_CONCAT ("string.h"        ${HDF_PREFIX}_HAVE_STRING_H)
+CHECK_INCLUDE_FILE_CONCAT ("strings.h"       ${HDF_PREFIX}_HAVE_STRINGS_H)
+CHECK_INCLUDE_FILE_CONCAT ("stdlib.h"        ${HDF_PREFIX}_HAVE_STDLIB_H)
+CHECK_INCLUDE_FILE_CONCAT ("memory.h"        ${HDF_PREFIX}_HAVE_MEMORY_H)
+CHECK_INCLUDE_FILE_CONCAT ("dlfcn.h"         ${HDF_PREFIX}_HAVE_DLFCN_H)
+CHECK_INCLUDE_FILE_CONCAT ("inttypes.h"      ${HDF_PREFIX}_HAVE_INTTYPES_H)
+CHECK_INCLUDE_FILE_CONCAT ("netinet/in.h"    ${HDF_PREFIX}_HAVE_NETINET_IN_H)
+# _Bool type support
+CHECK_INCLUDE_FILE_CONCAT (stdbool.h    ${HDF_PREFIX}_HAVE_STDBOOL_H)
+
+## Check for non-standard extenstion quadmath.h
+
+CHECK_INCLUDE_FILES(quadmath.h C_HAVE_QUADMATH)
+if (${C_HAVE_QUADMATH})
+  set(${HDF_PREFIX}_HAVE_QUADMATH_H 1)
+else ()
+  set(${HDF_PREFIX}_HAVE_QUADMATH_H 0)
+endif ()
+
 if (CYGWIN)
   set (${HDF_PREFIX}_HAVE_LSEEK64 0)
 endif ()
@@ -127,17 +199,13 @@ endif ()
 CHECK_LIBRARY_EXISTS_CONCAT ("ucb"    gethostname  ${HDF_PREFIX}_HAVE_LIBUCB)
 
 # For other tests to use the same libraries
-set (CMAKE_REQUIRED_LIBRARIES ${CMAKE_REQUIRED_LIBRARIES} ${LINK_LIBS})
+set (HDF5_REQUIRED_LIBRARIES ${HDF5_REQUIRED_LIBRARIES} ${LINK_LIBS})
 
 set (USE_INCLUDES "")
 if (WINDOWS)
   set (USE_INCLUDES ${USE_INCLUDES} "windows.h")
 endif ()
 
-if (NOT WINDOWS)
-  TEST_BIG_ENDIAN (${HDF_PREFIX}_WORDS_BIGENDIAN)
-endif ()
-
 # For other specific tests, use this MACRO.
 macro (HDF_FUNCTION_TEST OTHER_TEST)
   if (NOT DEFINED ${HDF_PREFIX}_${OTHER_TEST})
@@ -165,7 +233,7 @@ macro (HDF_FUNCTION_TEST OTHER_TEST)
         ${CMAKE_BINARY_DIR}
         ${HDF_RESOURCES_EXT_DIR}/HDFTests.c
         COMPILE_DEFINITIONS "${MACRO_CHECK_FUNCTION_DEFINITIONS}"
-        LINK_LIBRARIES "${CMAKE_REQUIRED_LIBRARIES}"
+        LINK_LIBRARIES "${HDF5_REQUIRED_LIBRARIES}"
         OUTPUT_VARIABLE OUTPUT
     )
     if (${OTHER_TEST})
@@ -188,63 +256,6 @@ endmacro ()
 HDF_FUNCTION_TEST (STDC_HEADERS)
 
 #-----------------------------------------------------------------------------
-# Check IF header file exists and add it to the list.
-#-----------------------------------------------------------------------------
-macro (CHECK_INCLUDE_FILE_CONCAT FILE VARIABLE)
-  CHECK_INCLUDE_FILES ("${USE_INCLUDES};${FILE}" ${VARIABLE})
-  if (${VARIABLE})
-    set (USE_INCLUDES ${USE_INCLUDES} ${FILE})
-  endif ()
-endmacro ()
-
-#-----------------------------------------------------------------------------
-#  Check for the existence of certain header files
-#-----------------------------------------------------------------------------
-CHECK_INCLUDE_FILE_CONCAT ("sys/file.h"      ${HDF_PREFIX}_HAVE_SYS_FILE_H)
-CHECK_INCLUDE_FILE_CONCAT ("sys/ioctl.h"     ${HDF_PREFIX}_HAVE_SYS_IOCTL_H)
-CHECK_INCLUDE_FILE_CONCAT ("sys/resource.h"  ${HDF_PREFIX}_HAVE_SYS_RESOURCE_H)
-CHECK_INCLUDE_FILE_CONCAT ("sys/socket.h"    ${HDF_PREFIX}_HAVE_SYS_SOCKET_H)
-CHECK_INCLUDE_FILE_CONCAT ("sys/stat.h"      ${HDF_PREFIX}_HAVE_SYS_STAT_H)
-CHECK_INCLUDE_FILE_CONCAT ("sys/time.h"      ${HDF_PREFIX}_HAVE_SYS_TIME_H)
-CHECK_INCLUDE_FILE_CONCAT ("sys/types.h"     ${HDF_PREFIX}_HAVE_SYS_TYPES_H)
-CHECK_INCLUDE_FILE_CONCAT ("features.h"      ${HDF_PREFIX}_HAVE_FEATURES_H)
-CHECK_INCLUDE_FILE_CONCAT ("dirent.h"        ${HDF_PREFIX}_HAVE_DIRENT_H)
-CHECK_INCLUDE_FILE_CONCAT ("setjmp.h"        ${HDF_PREFIX}_HAVE_SETJMP_H)
-CHECK_INCLUDE_FILE_CONCAT ("stddef.h"        ${HDF_PREFIX}_HAVE_STDDEF_H)
-CHECK_INCLUDE_FILE_CONCAT ("stdint.h"        ${HDF_PREFIX}_HAVE_STDINT_H)
-CHECK_INCLUDE_FILE_CONCAT ("unistd.h"        ${HDF_PREFIX}_HAVE_UNISTD_H)
-
-# Darwin
-CHECK_INCLUDE_FILE_CONCAT ("mach/mach_time.h" ${HDF_PREFIX}_HAVE_MACH_MACH_TIME_H)
-
-# Windows
-CHECK_INCLUDE_FILE_CONCAT ("io.h"            ${HDF_PREFIX}_HAVE_IO_H)
-if (NOT CYGWIN)
-  CHECK_INCLUDE_FILE_CONCAT ("winsock2.h"      ${HDF_PREFIX}_HAVE_WINSOCK2_H)
-endif ()
-CHECK_INCLUDE_FILE_CONCAT ("sys/timeb.h"     ${HDF_PREFIX}_HAVE_SYS_TIMEB_H)
-
-if (CMAKE_SYSTEM_NAME MATCHES "OSF")
-  CHECK_INCLUDE_FILE_CONCAT ("sys/sysinfo.h" ${HDF_PREFIX}_HAVE_SYS_SYSINFO_H)
-  CHECK_INCLUDE_FILE_CONCAT ("sys/proc.h"    ${HDF_PREFIX}_HAVE_SYS_PROC_H)
-else ()
-  set (${HDF_PREFIX}_HAVE_SYS_SYSINFO_H "" CACHE INTERNAL "" FORCE)
-  set (${HDF_PREFIX}_HAVE_SYS_PROC_H    "" CACHE INTERNAL "" FORCE)
-endif ()
-
-CHECK_INCLUDE_FILE_CONCAT ("globus/common.h" ${HDF_PREFIX}_HAVE_GLOBUS_COMMON_H)
-CHECK_INCLUDE_FILE_CONCAT ("pdb.h"           ${HDF_PREFIX}_HAVE_PDB_H)
-CHECK_INCLUDE_FILE_CONCAT ("pthread.h"       ${HDF_PREFIX}_HAVE_PTHREAD_H)
-CHECK_INCLUDE_FILE_CONCAT ("srbclient.h"     ${HDF_PREFIX}_HAVE_SRBCLIENT_H)
-CHECK_INCLUDE_FILE_CONCAT ("string.h"        ${HDF_PREFIX}_HAVE_STRING_H)
-CHECK_INCLUDE_FILE_CONCAT ("strings.h"       ${HDF_PREFIX}_HAVE_STRINGS_H)
-CHECK_INCLUDE_FILE_CONCAT ("stdlib.h"        ${HDF_PREFIX}_HAVE_STDLIB_H)
-CHECK_INCLUDE_FILE_CONCAT ("memory.h"        ${HDF_PREFIX}_HAVE_MEMORY_H)
-CHECK_INCLUDE_FILE_CONCAT ("dlfcn.h"         ${HDF_PREFIX}_HAVE_DLFCN_H)
-CHECK_INCLUDE_FILE_CONCAT ("inttypes.h"      ${HDF_PREFIX}_HAVE_INTTYPES_H)
-CHECK_INCLUDE_FILE_CONCAT ("netinet/in.h"    ${HDF_PREFIX}_HAVE_NETINET_IN_H)
-
-#-----------------------------------------------------------------------------
 #  Check for large file support
 #-----------------------------------------------------------------------------
 
@@ -402,13 +413,13 @@ HDF_CHECK_TYPE_SIZE (off64_t        ${HDF_PREFIX}_SIZEOF_OFF64_T)
 if (NOT ${HDF_PREFIX}_SIZEOF_OFF64_T)
   set (${HDF_PREFIX}_SIZEOF_OFF64_T 0)
 endif ()
+HDF_CHECK_TYPE_SIZE (time_t          ${HDF_PREFIX}_SIZEOF_TIME_T)
 
 #-----------------------------------------------------------------------------
 # Extra C99 types
 #-----------------------------------------------------------------------------
 
 # _Bool type support
-CHECK_INCLUDE_FILE_CONCAT (stdbool.h    ${HDF_PREFIX}_HAVE_STDBOOL_H)
 if (HAVE_STDBOOL_H)
   set (CMAKE_EXTRA_INCLUDE_FILES stdbool.h)
   HDF_CHECK_TYPE_SIZE (bool         ${HDF_PREFIX}_SIZEOF_BOOL)
@@ -580,7 +591,7 @@ if (WINDOWS)
         ${CMAKE_BINARY_DIR}
         ${HDF_RESOURCES_EXT_DIR}/HDFTests.c
         COMPILE_DEFINITIONS "${CMAKE_REQUIRED_DEFINITIONS} ${MACRO_CHECK_FUNCTION_DEFINITIONS}"
-        LINK_LIBRARIES "${CMAKE_REQUIRED_LIBRARIES}"
+        LINK_LIBRARIES "${HDF5_REQUIRED_LIBRARIES}"
         CMAKE_FLAGS "${CHECK_C_SOURCE_COMPILES_ADD_INCLUDES} -DCMAKE_SKIP_RPATH:BOOL=${CMAKE_SKIP_RPATH}"
         COMPILE_OUTPUT_VARIABLE OUTPUT
     )
diff --git a/config/cmake_ext_mod/HDFUseCXX.cmake b/config/cmake_ext_mod/HDFUseCXX.cmake
index f293ec5..efaa556 100644
--- a/config/cmake_ext_mod/HDFUseCXX.cmake
+++ b/config/cmake_ext_mod/HDFUseCXX.cmake
@@ -48,8 +48,8 @@ macro (HDF_CXX_FUNCTION_TEST OTHER_TEST)
   if (NOT DEFINED ${OTHER_TEST})
     set (MACRO_CHECK_FUNCTION_DEFINITIONS "-D${OTHER_TEST} ${CMAKE_REQUIRED_FLAGS}")
     set (OTHER_TEST_ADD_LIBRARIES)
-    if (CMAKE_REQUIRED_LIBRARIES)
-      set (OTHER_TEST_ADD_LIBRARIES "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
+    if (HDF5_REQUIRED_LIBRARIES)
+      set (OTHER_TEST_ADD_LIBRARIES "-DLINK_LIBRARIES:STRING=${HDF5_REQUIRED_LIBRARIES}")
     endif ()
 
     foreach (def
diff --git a/config/cmake_ext_mod/HDFUseFortran.cmake b/config/cmake_ext_mod/HDFUseFortran.cmake
index f8f3cea..c68c921 100644
--- a/config/cmake_ext_mod/HDFUseFortran.cmake
+++ b/config/cmake_ext_mod/HDFUseFortran.cmake
@@ -48,9 +48,9 @@ set (H5_FC_FUNC_ "H5_FC_FUNC_(name,NAME) ${CMAKE_MATCH_1}")
 #-----------------------------------------------------------------------------
 macro (CHECK_FORTRAN_FEATURE FUNCTION CODE VARIABLE)
     message (STATUS "Testing Fortran ${FUNCTION}")
-    if (CMAKE_REQUIRED_LIBRARIES)
+    if (HDF5_REQUIRED_LIBRARIES)
       set (CHECK_FUNCTION_EXISTS_ADD_LIBRARIES
-          "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
+          "-DLINK_LIBRARIES:STRING=${HDF5_REQUIRED_LIBRARIES}")
     else ()
       set (CHECK_FUNCTION_EXISTS_ADD_LIBRARIES)
     endif ()
diff --git a/config/cmake_ext_mod/runTest.cmake b/config/cmake_ext_mod/runTest.cmake
index 5569a73..4ac1dc8 100644
--- a/config/cmake_ext_mod/runTest.cmake
+++ b/config/cmake_ext_mod/runTest.cmake
@@ -26,9 +26,6 @@ endif ()
 if (NOT TEST_EXPECT)
   message (STATUS "Require TEST_EXPECT to be defined")
 endif ()
-if (NOT TEST_SKIP_COMPARE AND NOT TEST_REFERENCE)
-  message (FATAL_ERROR "Require TEST_REFERENCE to be defined")
-endif ()
 
 if (EXISTS ${TEST_FOLDER}/${TEST_OUTPUT})
   file (REMOVE ${TEST_FOLDER}/${TEST_OUTPUT})
@@ -38,11 +35,6 @@ if (EXISTS ${TEST_FOLDER}/${TEST_OUTPUT}.err)
   file (REMOVE ${TEST_FOLDER}/${TEST_OUTPUT}.err)
 endif ()
 
-# if there is not an error reference file add the error output to the stdout file
-if (NOT TEST_ERRREF)
-  set (ERROR_APPEND 1)
-endif ()
-
 message (STATUS "COMMAND: ${TEST_PROGRAM} ${TEST_ARGS}")
 
 if (TEST_LIBRARY_DIRECTORY)
@@ -96,9 +88,21 @@ endif ()
 message (STATUS "COMMAND Result: ${TEST_RESULT}")
 
 # if the .err file exists and ERRROR_APPEND is enabled
-if (ERROR_APPEND AND EXISTS ${TEST_FOLDER}/${TEST_OUTPUT}.err)
+if (EXISTS ${TEST_FOLDER}/${TEST_OUTPUT}.err)
   file (READ ${TEST_FOLDER}/${TEST_OUTPUT}.err TEST_STREAM)
-  file (APPEND ${TEST_FOLDER}/${TEST_OUTPUT} "${TEST_STREAM}")
+  if (TEST_MASK_FILE)
+    STRING(REGEX REPLACE "CurrentDir is [^\n]+\n" "CurrentDir is (dir name)\n" TEST_STREAM "${TEST_STREAM}")
+  endif ()
+  # remove special output
+  string (REGEX REPLACE "^.*_pmi_alps[^\n]+\n" "" TEST_STREAM "${TEST_STREAM}")
+
+  if (NOT ERROR_APPEND)
+    # write back to original .err file
+    file (WRITE ${TEST_FOLDER}/${TEST_OUTPUT}.err "${TEST_STREAM}")
+  else ()
+    # append error output to the stdout output file
+    file (APPEND ${TEST_FOLDER}/${TEST_OUTPUT} "${TEST_STREAM}")
+  endif ()
 endif ()
 
 # append the test result status with a predefined text
@@ -119,6 +123,14 @@ endif ()
 
 message (STATUS "COMMAND Error: ${TEST_ERROR}")
 
+# remove special output
+file (READ ${TEST_FOLDER}/${TEST_OUTPUT} TEST_STREAM)
+string (FIND TEST_STREAM "_pmi_alps" "${TEST_FIND_RESULT}")
+if (NOT ${TEST_FIND_RESULT} STREQUAL "0")
+  string (REGEX REPLACE "^.*_pmi_alps[^\n]+\n" "" TEST_STREAM "${TEST_STREAM}")
+  file (WRITE ${TEST_FOLDER}/${TEST_OUTPUT} ${TEST_STREAM})
+endif ()
+
 # if the output file needs Storage text removed
 if (TEST_MASK)
   file (READ ${TEST_FOLDER}/${TEST_OUTPUT} TEST_STREAM)
@@ -173,63 +185,65 @@ endif ()
 
 # compare output files to references unless this must be skipped
 if (NOT TEST_SKIP_COMPARE)
-  if (WIN32 AND NOT MINGW)
-    file (READ ${TEST_FOLDER}/${TEST_REFERENCE} TEST_STREAM)
-    file (WRITE ${TEST_FOLDER}/${TEST_REFERENCE} "${TEST_STREAM}")
-  endif ()
+  if (EXISTS ${TEST_FOLDER}/${TEST_REFERENCE})
+    if (WIN32 AND NOT MINGW)
+      file (READ ${TEST_FOLDER}/${TEST_REFERENCE} TEST_STREAM)
+      file (WRITE ${TEST_FOLDER}/${TEST_REFERENCE} "${TEST_STREAM}")
+    endif ()
 
-  if (NOT TEST_SORT_COMPARE)
-    # now compare the output with the reference
-    execute_process (
-        COMMAND ${CMAKE_COMMAND} -E compare_files ${TEST_FOLDER}/${TEST_OUTPUT} ${TEST_FOLDER}/${TEST_REFERENCE}
-        RESULT_VARIABLE TEST_RESULT
-    )
-  else ()
-    file (STRINGS ${TEST_FOLDER}/${TEST_OUTPUT} v1)
-    file (STRINGS ${TEST_FOLDER}/${TEST_REFERENCE} v2)
-    list (SORT v1)
-    list (SORT v2)
-    if (NOT v1 STREQUAL v2)
-      set(TEST_RESULT 1)
+    if (NOT TEST_SORT_COMPARE)
+      # now compare the output with the reference
+      execute_process (
+          COMMAND ${CMAKE_COMMAND} -E compare_files ${TEST_FOLDER}/${TEST_OUTPUT} ${TEST_FOLDER}/${TEST_REFERENCE}
+          RESULT_VARIABLE TEST_RESULT
+      )
+    else ()
+      file (STRINGS ${TEST_FOLDER}/${TEST_OUTPUT} v1)
+      file (STRINGS ${TEST_FOLDER}/${TEST_REFERENCE} v2)
+      list (SORT v1)
+      list (SORT v2)
+      if (NOT v1 STREQUAL v2)
+        set(TEST_RESULT 1)
+      endif ()
     endif ()
-  endif ()
 
-  if (NOT "${TEST_RESULT}" STREQUAL "0")
-    set (TEST_RESULT 0)
-    file (STRINGS ${TEST_FOLDER}/${TEST_OUTPUT} test_act)
-    list (LENGTH test_act len_act)
-    file (STRINGS ${TEST_FOLDER}/${TEST_REFERENCE} test_ref)
-    list (LENGTH test_ref len_ref)
-    if (NOT "${len_act}" STREQUAL "0" AND NOT "${len_ref}" STREQUAL "0")
-      math (EXPR _FP_LEN "${len_ref} - 1")
-      foreach (line RANGE 0 ${_FP_LEN})
-        list (GET test_act ${line} str_act)
-        list (GET test_ref ${line} str_ref)
-        if (NOT "${str_act}" STREQUAL "${str_ref}")
-          if (NOT "${str_act}" STREQUAL "")
-            set (TEST_RESULT 1)
-            message ("line = ${line}\n***ACTUAL: ${str_act}\n****REFER: ${str_ref}\n")
+    if (NOT "${TEST_RESULT}" STREQUAL "0")
+      set (TEST_RESULT 0)
+      file (STRINGS ${TEST_FOLDER}/${TEST_OUTPUT} test_act)
+      list (LENGTH test_act len_act)
+      file (STRINGS ${TEST_FOLDER}/${TEST_REFERENCE} test_ref)
+      list (LENGTH test_ref len_ref)
+      if (NOT "${len_act}" STREQUAL "0" AND NOT "${len_ref}" STREQUAL "0")
+        math (EXPR _FP_LEN "${len_ref} - 1")
+        foreach (line RANGE 0 ${_FP_LEN})
+          list (GET test_act ${line} str_act)
+          list (GET test_ref ${line} str_ref)
+          if (NOT "${str_act}" STREQUAL "${str_ref}")
+            if (NOT "${str_act}" STREQUAL "")
+              set (TEST_RESULT 1)
+              message ("line = ${line}\n***ACTUAL: ${str_act}\n****REFER: ${str_ref}\n")
+            endif ()
           endif ()
+        endforeach ()
+      else ()
+        if ("${len_act}" STREQUAL "0")
+          message (STATUS "COMPARE Failed: ${TEST_FOLDER}/${TEST_OUTPUT} is empty")
+        endif ()
+        if ("${len_ref}" STREQUAL "0")
+          message (STATUS "COMPARE Failed: ${TEST_FOLDER}/${TEST_REFERENCE} is empty")
         endif ()
-      endforeach ()
-    else ()
-      if ("${len_act}" STREQUAL "0")
-        message (STATUS "COMPARE Failed: ${TEST_FOLDER}/${TEST_OUTPUT} is empty")
       endif ()
-      if ("${len_ref}" STREQUAL "0")
-        message (STATUS "COMPARE Failed: ${TEST_FOLDER}/${TEST_REFERENCE} is empty")
+      if (NOT "${len_act}" STREQUAL "${len_ref}")
+        set (TEST_RESULT 1)
       endif ()
     endif ()
-    if (NOT "${len_act}" STREQUAL "${len_ref}")
-      set (TEST_RESULT 1)
-    endif ()
-  endif ()
 
-  message (STATUS "COMPARE Result: ${TEST_RESULT}")
+    message (STATUS "COMPARE Result: ${TEST_RESULT}")
 
-  # again, if return value is !=0 scream and shout
-  if (NOT "${TEST_RESULT}" STREQUAL "0")
-    message (FATAL_ERROR "Failed: The output of ${TEST_OUTPUT} did not match ${TEST_REFERENCE}")
+    # again, if return value is !=0 scream and shout
+    if (NOT "${TEST_RESULT}" STREQUAL "0")
+      message (FATAL_ERROR "Failed: The output of ${TEST_OUTPUT} did not match ${TEST_REFERENCE}")
+    endif ()
   endif ()
 
   # now compare the .err file with the error reference, if supplied
@@ -260,7 +274,7 @@ if (NOT TEST_SKIP_COMPARE)
             if (NOT "${str_act}" STREQUAL "")
               set (TEST_RESULT 1)
               message ("line = ${line}\n***ACTUAL: ${str_act}\n****REFER: ${str_ref}\n")
-             endif ()
+            endif ()
           endif ()
         endforeach ()
       else ()
@@ -285,5 +299,27 @@ if (NOT TEST_SKIP_COMPARE)
   endif ()
 endif ()
 
+if (TEST_GREP_COMPARE)
+  # now grep the output with the reference
+  file (READ ${TEST_FOLDER}/${TEST_OUTPUT} TEST_STREAM)
+
+  # TEST_REFERENCE should always be matched
+  string (REGEX MATCH "${TEST_REFERENCE}" TEST_MATCH ${TEST_STREAM})
+  string (COMPARE EQUAL "${TEST_REFERENCE}" "${TEST_MATCH}" TEST_RESULT)
+  if ("${TEST_RESULT}" STREQUAL "0")
+    message (FATAL_ERROR "Failed: The output of ${TEST_PROGRAM} did not contain ${TEST_REFERENCE}")
+  endif ()
+
+  string (REGEX MATCH "${TEST_FILTER}" TEST_MATCH ${TEST_STREAM})
+  if ("${TEST_EXPECT}" STREQUAL "1")
+    # TEST_EXPECT (1) interperts TEST_FILTER as NOT to match
+    string (LENGTH "${TEST_MATCH}" TEST_RESULT)
+    if (NOT "${TEST_RESULT}" STREQUAL "0")
+      message (FATAL_ERROR "Failed: The output of ${TEST_PROGRAM} did contain ${TEST_FILTER}")
+    endif ()
+  endif ()
+endif ()
+
 # everything went fine...
-message ("Passed: The output of ${TEST_PROGRAM} matches ${TEST_REFERENCE}")
+message ("${TEST_PROGRAM} Passed")
+
diff --git a/config/conclude.am b/config/conclude.am
index 4655565..9da1da5 100644
--- a/config/conclude.am
+++ b/config/conclude.am
@@ -131,28 +131,43 @@ $(TEST_PROG_CHKEXE) $(TEST_PROG_PARA_CHKEXE) dummy.chkexe_:
                  echo "============================" > $${log}; \
               fi; \
               if test "X$(FORTRAN_API)" = "Xyes"; then \
-                 echo "Fortran API: Testing $(HDF5_DRIVER) $${tname} $(TEST_FLAGS)"; \
+                 echo "Fortran API: Testing $${tname} $(TEST_FLAGS)"; \
                  if test -n "$(REALTIMEOUTPUT)"; then \
-                    echo "Fortran API: $(HDF5_DRIVER) $${tname} $(TEST_FLAGS) Test Log" | tee -a $${log}; \
+                    echo "Fortran API: Test log for $${tname} $(TEST_FLAGS)" | tee -a $${log}; \
                  else \
-                    echo "Fortran API: $(HDF5_DRIVER) $${tname} $(TEST_FLAGS) Test Log" >> $${log}; \
+                    echo "Fortran API: Test log for $${tname} $(TEST_FLAGS)" >> $${log}; \
                  fi; \
               elif test "X$(CXX_API)" = "Xyes"; then \
-                 echo "C++ API: Testing $(HDF5_DRIVER) $${tname} $(TEST_FLAGS)"; \
+                 echo "C++ API: Testing $${tname} $(TEST_FLAGS)"; \
                  if test -n "$(REALTIMEOUTPUT)"; then \
-                    echo "C++ API: $(HDF5_DRIVER) $${tname} $(TEST_FLAGS) Test Log" | tee -a $${log};\
+                    echo "C++ API: Test log for $${tname} $(TEST_FLAGS)" | tee -a $${log};\
                  else \
-                    echo "C++ API: $(HDF5_DRIVER) $${tname} $(TEST_FLAGS) Test Log" >> $${log};\
+                    echo "C++ API: Test log for $${tname} $(TEST_FLAGS)" >> $${log};\
                  fi; \
               else \
-                 echo "Testing $(HDF5_DRIVER) $${tname} $(TEST_FLAGS)"; \
+                 echo "Testing: $${tname} $(TEST_FLAGS)"; \
                  if test -n "$(REALTIMEOUTPUT)"; then \
-                    echo "$(HDF5_DRIVER) $${tname} $(TEST_FLAGS) Test Log" | tee -a $${log}; \
+                    echo "Test log for $${tname} $(TEST_FLAGS)" | tee -a $${log}; \
                  else \
-                    echo "$(HDF5_DRIVER) $${tname} $(TEST_FLAGS) Test Log" >> $${log}; \
+                    echo "Test log for $${tname} $(TEST_FLAGS)" >> $${log}; \
                  fi; \
               fi; \
               if test -n "$(REALTIMEOUTPUT)"; then \
+                if test -n "$(HDF5_VOL_CONNECTOR)"; then \
+                  echo "VOL connector: $(HDF5_VOL_CONNECTOR)" | tee -a $${log}; \
+                fi; \
+                if test -n "$(HDF5_DRIVER)"; then \
+                  echo "Virtual file driver (VFD): $(HDF5_DRIVER)" | tee -a $${log}; \
+                fi; \
+              else \
+                if test -n "$(HDF5_VOL_CONNECTOR)"; then \
+                  echo "VOL connector: $(HDF5_VOL_CONNECTOR)" >> $${log}; \
+                fi; \
+                if test -n "$(HDF5_DRIVER)"; then \
+                  echo "Virtual file driver (VFD): $(HDF5_DRIVER)" >> $${log}; \
+                fi; \
+              fi; \
+              if test -n "$(REALTIMEOUTPUT)"; then \
                  echo "============================" | tee -a $${log}; \
               else \
                  echo "============================" >> $${log}; \
@@ -234,7 +249,7 @@ build-check-p: $(LIB) $(PROGS) $(chk_TESTS)
 	    echo "**** Hint ****";                                            \
 	    echo "Parallel test files reside in the current directory"        \
 	         "by default.";                                               \
-	    echo "Set HDF5_PARAPREFIX to use another directory. E.g.,";       \
+	    echo "Set HDF5_PARAPREFIX to use another directory. e.g.,";       \
 	    echo "    HDF5_PARAPREFIX=/PFS/user/me";                          \
 	    echo "    export HDF5_PARAPREFIX";                                \
 	    echo "    make check";                                            \
diff --git a/config/toolchain/GCC.cmake b/config/toolchain/GCC.cmake
index ddb1641..c41d0ca 100644
--- a/config/toolchain/GCC.cmake
+++ b/config/toolchain/GCC.cmake
@@ -1,5 +1,6 @@
-# Uncomment the following to use cross-compiling
+# Uncomment the following line and the correct system name to use cross-compiling
 #set(CMAKE_SYSTEM_NAME Linux)
+
 set(CMAKE_COMPILER_VENDOR "GCC")
 
 set(CMAKE_C_COMPILER cc)
diff --git a/config/toolchain/PGI.cmake b/config/toolchain/PGI.cmake
new file mode 100644
index 0000000..ec58cbb
--- /dev/null
+++ b/config/toolchain/PGI.cmake
@@ -0,0 +1,11 @@
+# Uncomment the following to use cross-compiling
+#set(CMAKE_SYSTEM_NAME Linux)
+
+set(CMAKE_COMPILER_VENDOR "PGI")
+
+set(CMAKE_C_COMPILER pgcc)
+set(CMAKE_CXX_COMPILER pgc++)
+set(CMAKE_Fortran_COMPILER pgf90)
+
+# the following is used if cross-compiling
+set(CMAKE_CROSSCOMPILING_EMULATOR "")
diff --git a/config/toolchain/crayle.cmake b/config/toolchain/crayle.cmake
index a83147b..47d8afc 100644
--- a/config/toolchain/crayle.cmake
+++ b/config/toolchain/crayle.cmake
@@ -1,5 +1,6 @@
-# Uncomment the following to use cross-compiling
+# The following line will use cross-compiling
 set(CMAKE_SYSTEM_NAME Linux)
+
 set(CMAKE_COMPILER_VENDOR "CrayLinuxEnvironment")
 
 set(CMAKE_C_COMPILER cc)
diff --git a/config/toolchain/intel.cmake b/config/toolchain/intel.cmake
index f1a5734..97f6a64 100644
--- a/config/toolchain/intel.cmake
+++ b/config/toolchain/intel.cmake
@@ -1,5 +1,6 @@
 # Uncomment the following to use cross-compiling
 #set(CMAKE_SYSTEM_NAME Linux)
+
 set(CMAKE_COMPILER_VENDOR "intel")
 
 set(CMAKE_C_COMPILER icc)
diff --git a/configure.ac b/configure.ac
index b658a99..63268b1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1210,6 +1210,15 @@ EOF
 AC_CHECK_SIZEOF([bool])
 fi
 
+AC_CHECK_SIZEOF(time_t, [], [
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_TIME_H
+#include <time.h>
+#endif
+])
+
 ## Checkpoint the cache
 AC_CACHE_SAVE
 
@@ -2368,40 +2377,6 @@ case "X-$CODESTACK" in
 esac
 
 ## ----------------------------------------------------------------------
-## Check if they would like the metadata trace file code compiled in
-##
-AC_MSG_CHECKING([whether metadata trace file code is enabled])
-AC_ARG_ENABLE([metadata-trace-file],
-              [AS_HELP_STRING([--enable-metadata-trace-file],
-                              [Enable metadata trace file collection.
-                               [default=no]
-                              ])],
-              [METADATATRACEFILE=$enableval])
-
-## Set the default level.
-if test "X-$METADATATRACEFILE" = X- ; then
-  METADATATRACEFILE=no
-fi
-
-## Allow this variable to be substituted in
-## other files (src/libhdf5.settings.in, etc.)
-AC_SUBST([METADATATRACEFILE])
-
-case "X-$METADATATRACEFILE" in
-  X-yes)
-      AC_MSG_RESULT([yes])
-      AC_DEFINE([METADATA_TRACE_FILE], [1],
-                [Define if the metadata trace file code is to be compiled in])
-    ;;
-  X-no)
-      AC_MSG_RESULT([no])
-    ;;
-  *)
-      AC_MSG_ERROR([Unrecognized value: $METADATATRACEFILE])
-    ;;
-esac
-
-## ----------------------------------------------------------------------
 ## Enable tracing of the API
 ##
 AC_MSG_CHECKING([for API tracing]);
@@ -3073,6 +3048,30 @@ else
 fi
 
 ## ----------------------------------------------------------------------
+## Set the flag to indicate that the machine is IBM ppc64le and cannot
+## accurately convert some long double values.
+##
+AC_MSG_CHECKING([if the system is IBM ppc64le and cannot correctly convert some long double values])
+
+TEST_SRC="`(echo \"#define H5_DISABLE_SOME_LDOUBLE_CONV_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`"
+
+if test ${ac_cv_sizeof_long_double} = 0; then
+   hdf5_cv_disable_some_ldouble_conv=${hdf5_cv_disable_some_ldouble_conv=no}
+else
+   AC_CACHE_VAL([hdf5_cv_disable_some_ldouble_conv],
+        [AC_RUN_IFELSE([AC_LANG_SOURCE([$TEST_SRC])],
+        [hdf5_cv_disable_some_ldouble_conv=yes], [hdf5_cv_disable_some_ldouble_conv=no],[])])
+fi
+
+if test ${hdf5_cv_disable_some_ldouble_conv} = "yes"; then
+  AC_DEFINE([DISABLE_SOME_LDOUBLE_CONV], [1],
+            [Define if your system is IBM ppc64le and cannot convert some long double values correctly.])
+  AC_MSG_RESULT([yes])
+else
+  AC_MSG_RESULT([no])
+fi
+
+## ----------------------------------------------------------------------
 ## Set some variables for general configuration information to be saved
 ## and installed with the libraries (used to generate libhdf5.settings).
 ##
@@ -3512,6 +3511,7 @@ AC_CONFIG_FILES([src/libhdf5.settings
                  src/Makefile
                  test/Makefile
                  test/H5srcdir_str.h
+                 test/testabort_fail.sh
                  test/testcheck_version.sh
                  test/testerror.sh
                  test/testflushrefresh.sh
@@ -3519,10 +3519,11 @@ AC_CONFIG_FILES([src/libhdf5.settings
                  test/testlinks_env.sh
                  test/testswmr.sh
                  test/testvdsswmr.sh
-                 test/test_filenotclosed.sh
                  test/test_filter_plugin.sh
                  test/test_usecases.sh
+                 test/test_vol_plugin.sh
                  testpar/Makefile
+                 testpar/testpflush.sh
                  tools/Makefile
                  tools/lib/Makefile
                  tools/src/Makefile
diff --git a/examples/CMakeTests.cmake b/examples/CMakeTests.cmake
index dd4766a..6b4504b 100644
--- a/examples/CMakeTests.cmake
+++ b/examples/CMakeTests.cmake
@@ -181,9 +181,9 @@
 ### Windows pops up a modal permission dialog on this test
   if (H5_HAVE_PARALLEL AND NOT WIN32)
     if (HDF5_ENABLE_USING_MEMCHECKER)
-      add_test (NAME EXAMPLES-ph5example COMMAND $<TARGET_FILE:ph5example>)
+      add_test (NAME EXAMPLES_PAR-ph5example COMMAND $<TARGET_FILE:ph5example>)
     else ()
-      add_test (NAME EXAMPLES-ph5example COMMAND "${CMAKE_COMMAND}"
+      add_test (NAME EXAMPLES_PAR-ph5example COMMAND "${CMAKE_COMMAND}"
           -D "TEST_PROGRAM=$<TARGET_FILE:ph5example>"
           -D "TEST_ARGS:STRING="
           -D "TEST_EXPECT=0"
@@ -195,14 +195,14 @@
       )
     endif ()
     if (NOT "${last_test}" STREQUAL "")
-      set_tests_properties (EXAMPLES-ph5example PROPERTIES DEPENDS ${last_test})
+      set_tests_properties (EXAMPLES_PAR-ph5example PROPERTIES DEPENDS ${last_test})
     endif ()
-    set (last_test "EXAMPLES-ph5example")
+    set (last_test "EXAMPLES_PAR-ph5example")
     if (BUILD_SHARED_LIBS)
       if (HDF5_ENABLE_USING_MEMCHECKER)
-        add_test (NAME EXAMPLES-shared-ph5example COMMAND $<TARGET_FILE:ph5example-shared>)
+        add_test (NAME EXAMPLES_PAR-shared-ph5example COMMAND $<TARGET_FILE:ph5example-shared>)
       else ()
-        add_test (NAME EXAMPLES-shared-ph5example COMMAND "${CMAKE_COMMAND}"
+        add_test (NAME EXAMPLES_PAR-shared-ph5example COMMAND "${CMAKE_COMMAND}"
             -D "TEST_PROGRAM=$<TARGET_FILE:ph5example-shared>"
             -D "TEST_ARGS:STRING="
             -D "TEST_EXPECT=0"
@@ -213,10 +213,10 @@
             -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
         )
       endif ()
-      set_tests_properties (EXAMPLES-shared-ph5example PROPERTIES WORKING_DIRECTORY ${PROJECT_BINARY_DIR}/H5EX-shared)
+      set_tests_properties (EXAMPLES_PAR-shared-ph5example PROPERTIES WORKING_DIRECTORY ${PROJECT_BINARY_DIR}/H5EX-shared)
       if (NOT "${last_test}" STREQUAL "")
-        set_tests_properties (EXAMPLES-shared-ph5example PROPERTIES DEPENDS ${last_test})
+        set_tests_properties (EXAMPLES_PAR-shared-ph5example PROPERTIES DEPENDS ${last_test})
       endif ()
-      set (last_test "EXAMPLES-shared-ph5example")
+      set (last_test "EXAMPLES_PAR-shared-ph5example")
     endif ()
   endif ()
diff --git a/fortran/src/H5Fff.F90 b/fortran/src/H5Fff.F90
index 9c8b941..cc51f37 100644
--- a/fortran/src/H5Fff.F90
+++ b/fortran/src/H5Fff.F90
@@ -946,4 +946,97 @@ CONTAINS
 
   END SUBROUTINE h5fget_file_image_f
 
+!****s* H5F (F03)/h5fget_dset_no_attrs_hint_f_F03
+!
+! NAME
+!  h5fget_dset_no_attrs_hint_f
+!
+! PURPOSE
+!  Gets the value of the "minimize dataset headers" value which creates
+!  smaller dataset object headers when its set and no attributes are present.
+!
+! INPUTS
+!  file_id    - Target file identifier.
+!
+! OUTPUTS
+!  minimize   - Value of the setting.
+!  hdferr     - error code:
+!                 0 on success and -1 on failure
+!
+! AUTHOR
+!  Dana Robinson
+!  January 2019
+!
+! Fortran2003 Interface:
+  SUBROUTINE h5fget_dset_no_attrs_hint_f(file_id, minimize, hdferr)
+    IMPLICIT NONE
+    INTEGER(HID_T) , INTENT(IN)              :: file_id
+    LOGICAL        , INTENT(OUT)             :: minimize
+    INTEGER        , INTENT(OUT)             :: hdferr
+!*****
+    LOGICAL(C_BOOL) :: c_minimize
+
+    INTERFACE
+       INTEGER FUNCTION h5fget_dset_no_attrs_hint_c(file_id, minimize) BIND(C, NAME='H5Fget_dset_no_attrs_hint')
+         IMPORT :: HID_T, C_BOOL
+         IMPLICIT NONE
+         INTEGER(HID_T), INTENT(IN), VALUE :: file_id
+         LOGICAL(C_BOOL), INTENT(OUT) :: minimize
+       END FUNCTION h5fget_dset_no_attrs_hint_c
+    END INTERFACE
+
+    hdferr = INT(h5fget_dset_no_attrs_hint_c(file_id, c_minimize))
+
+    ! Transfer value of C C_BOOL type to Fortran LOGICAL 
+    minimize = c_minimize
+
+  END SUBROUTINE h5fget_dset_no_attrs_hint_f
+
+!****s* H5F (F03)/h5fset_dset_no_attrs_hint_f_F03
+!
+! NAME
+!  h5fset_dset_no_attrs_hint_f
+!
+! PURPOSE
+!  Sets the value of the "minimize dataset headers" value which creates
+!  smaller dataset object headers when its set and no attributes are present.
+!
+! INPUTS
+!  file_id    - Target file identifier.
+!  minimize   - Value of the setting.
+!
+! OUTPUTS
+!  hdferr     - error code:
+!                 0 on success and -1 on failure
+!
+! AUTHOR
+!  Dana Robinson
+!  January 2019
+!
+! Fortran2003 Interface:
+  SUBROUTINE h5fset_dset_no_attrs_hint_f(file_id, minimize, hdferr)
+    IMPLICIT NONE
+    INTEGER(HID_T) , INTENT(IN)              :: file_id
+    LOGICAL        , INTENT(IN)              :: minimize
+    INTEGER        , INTENT(OUT)             :: hdferr
+!*****
+    LOGICAL(C_BOOL) :: c_minimize
+
+    INTERFACE
+       INTEGER FUNCTION h5fset_dset_no_attrs_hint_c(file_id, minimize) BIND(C, NAME='H5Fset_dset_no_attrs_hint')
+         IMPORT :: HID_T, C_BOOL
+         IMPLICIT NONE
+         INTEGER(HID_T), INTENT(IN), VALUE :: file_id
+         LOGICAL(C_BOOL), INTENT(IN), VALUE :: minimize
+       END FUNCTION h5fset_dset_no_attrs_hint_c
+    END INTERFACE
+
+    ! Transfer value of Fortran LOGICAL to C C_BOOL type
+    c_minimize = minimize
+
+    hdferr = INT(h5fset_dset_no_attrs_hint_c(file_id, c_minimize))
+
+  END SUBROUTINE h5fset_dset_no_attrs_hint_f
+
 END MODULE H5F
+
diff --git a/fortran/src/H5Of.c b/fortran/src/H5Of.c
index 45b7f09..08305ea 100644
--- a/fortran/src/H5Of.c
+++ b/fortran/src/H5Of.c
@@ -27,11 +27,15 @@ fill_h5o_info_t_f(H5O_info_t Oinfo, H5O_info_t_f *object_info);
 int_f
 fill_h5o_info_t_f(H5O_info_t Oinfo, H5O_info_t_f *object_info) {
 
+  /* This function does not used the field parameter because we want 
+   * this function to fill the unfilled fields with C's default values.
+   */
+
   struct tm *ts;
 
   object_info->fileno    = Oinfo.fileno;
   object_info->addr      = (haddr_t_f)Oinfo.addr;
- 
+
   object_info->type      = (int_f)Oinfo.type;
   object_info->rc        = (int_f)Oinfo.rc;
 
@@ -96,6 +100,8 @@ fill_h5o_info_t_f(H5O_info_t Oinfo, H5O_info_t_f *object_info) {
 
   object_info->meta_size.obj.index_size = (hsize_t_f)Oinfo.meta_size.obj.index_size;
   object_info->meta_size.obj.heap_size  = (hsize_t_f)Oinfo.meta_size.obj.heap_size;
+  object_info->meta_size.attr.index_size = (hsize_t_f)Oinfo.meta_size.attr.index_size;
+  object_info->meta_size.attr.heap_size  = (hsize_t_f)Oinfo.meta_size.attr.heap_size;
 
   return 0;
 
@@ -138,7 +144,7 @@ h5olink_c (hid_t_f *object_id, hid_t_f *new_loc_id, _fcd name, size_t_f *namelen
    * Call H5Olink function.
    */
   if((hid_t_f)H5Olink((hid_t)*object_id, (hid_t)*new_loc_id, c_name,
-		       (hid_t)*lcpl_id, (hid_t)*lapl_id) < 0)
+                      (hid_t)*lcpl_id, (hid_t)*lapl_id) < 0)
     HGOTO_DONE(FAIL);
 
  done:
@@ -229,6 +235,7 @@ h5oclose_c ( hid_t_f *object_id )
  *  idx - Iteration position at which to start
  *  op - Callback function passing data regarding the link to the calling application
  *  op_data - User-defined pointer to data required by the application for its processing of the link
+ *  fields - Flags specifying the fields to include in object_info.
  *
  * OUTPUTS
  *  idx - Position at which an interrupted iteration may be restarted
@@ -241,7 +248,7 @@ h5oclose_c ( hid_t_f *object_id )
  * SOURCE
 */
 int_f
-h5ovisit_c(hid_t_f *group_id, int_f *index_type, int_f *order, H5O_iterate_t op, void *op_data )
+h5ovisit_c(hid_t_f *group_id, int_f *index_type, int_f *order, H5O_iterate_t op, void *op_data, int_f *fields )
 /******/
 {
   int_f ret_value = -1;       /* Return value */
@@ -250,7 +257,8 @@ h5ovisit_c(hid_t_f *group_id, int_f *index_type, int_f *order, H5O_iterate_t op,
   /*
    * Call H5Ovisit2
    */
-  func_ret_value = H5Ovisit2( (hid_t)*group_id, (H5_index_t)*index_type, (H5_iter_order_t)*order, op, op_data, H5O_INFO_ALL);
+
+  func_ret_value = H5Ovisit2( (hid_t)*group_id, (H5_index_t)*index_type, (H5_iter_order_t)*order, op, op_data, (unsigned)*fields);
 
   ret_value = (int_f)func_ret_value;
 
@@ -302,6 +310,7 @@ h5oopen_by_addr_c (hid_t_f *loc_id, haddr_t_f *addr, hid_t_f *obj_id)
  *  name         - Name of group, relative to loc_id.
  *  namelen      - Name length.
  *  lapl_id      - Link access property list.
+ *  fields       - Flags specifying the fields to include in object_info.
  * OUTPUTS
  *  object_info  - Buffer in which to return object information.
  *
@@ -314,7 +323,7 @@ h5oopen_by_addr_c (hid_t_f *loc_id, haddr_t_f *addr, hid_t_f *obj_id)
 */
 int_f
 h5oget_info_by_name_c (hid_t_f *loc_id, _fcd name, size_t_f *namelen, hid_t_f *lapl_id,
-			H5O_info_t_f *object_info)
+                       H5O_info_t_f *object_info, int_f *fields)
 /******/
 {
   char *c_name = NULL;          /* Buffer to hold C string */
@@ -331,10 +340,10 @@ h5oget_info_by_name_c (hid_t_f *loc_id, _fcd name, size_t_f *namelen, hid_t_f *l
    * Call H5Oinfo_by_name function.
    */
   if(H5Oget_info_by_name2((hid_t)*loc_id, c_name,
-			 &Oinfo, H5O_INFO_ALL, (hid_t)*lapl_id) < 0)
+                          &Oinfo, (unsigned)*fields, (hid_t)*lapl_id) < 0)
     HGOTO_DONE(FAIL);
 
-  ret_value = fill_h5o_info_t_f(Oinfo,object_info);
+  ret_value = fill_h5o_info_t_f(Oinfo, object_info);
 
  done:
   if(c_name)
@@ -354,6 +363,7 @@ h5oget_info_by_name_c (hid_t_f *loc_id, _fcd name, size_t_f *namelen, hid_t_f *l
  *  lapl_id      - Link access property list.
  * OUTPUTS
  *  object_info  - Buffer in which to return object information.
+ *  fields       - Flags specifying the fields to include in object_info.
  *
  * RETURNS
  *  0 on success, -1 on failure
@@ -364,7 +374,7 @@ h5oget_info_by_name_c (hid_t_f *loc_id, _fcd name, size_t_f *namelen, hid_t_f *l
 */
 int_f
 h5oget_info_by_idx_c (hid_t_f *loc_id, _fcd  group_name, size_t_f *namelen, 
-		       int_f *index_field, int_f *order, hsize_t_f *n, hid_t_f *lapl_id, H5O_info_t_f *object_info)
+                      int_f *index_field, int_f *order, hsize_t_f *n, hid_t_f *lapl_id, H5O_info_t_f *object_info, int_f *fields)
 /******/
 {
   char *c_group_name = NULL;     /* Buffer to hold C string */
@@ -386,7 +396,7 @@ h5oget_info_by_idx_c (hid_t_f *loc_id, _fcd  group_name, size_t_f *namelen,
    * Call H5Oinfo_by_idx function.
    */
   if(H5Oget_info_by_idx2((hid_t)*loc_id, c_group_name, c_index_field, c_order, (hsize_t)*n,
-			 &Oinfo, H5O_INFO_ALL, (hid_t)*lapl_id) < 0)
+                         &Oinfo, (unsigned)*fields, (hid_t)*lapl_id) < 0)
     HGOTO_DONE(FAIL);
 
   ret_value = fill_h5o_info_t_f(Oinfo,object_info);
@@ -404,6 +414,7 @@ h5oget_info_by_idx_c (hid_t_f *loc_id, _fcd  group_name, size_t_f *namelen,
  *  Calls H5Oget_info
  * INPUTS
  *  object_id   - Identifier for target object.
+ *  fields      - Flags specifying the fields to include in object_info.
  * OUTPUTS
  *  object_info - Buffer in which to return object information.
  *
@@ -415,7 +426,7 @@ h5oget_info_by_idx_c (hid_t_f *loc_id, _fcd  group_name, size_t_f *namelen,
  * SOURCE
 */
 int_f
-h5oget_info_c (hid_t_f *object_id, H5O_info_t_f *object_info)
+h5oget_info_c (hid_t_f *object_id, H5O_info_t_f *object_info, int_f *fields)
 /******/
 {
   int_f ret_value = 0;          /* Return value */
@@ -424,7 +435,7 @@ h5oget_info_c (hid_t_f *object_id, H5O_info_t_f *object_info)
   /*
    * Call H5Oinfo_by_name function.
    */
-  if(H5Oget_info2((hid_t)*object_id, &Oinfo, H5O_INFO_ALL) < 0)
+  if(H5Oget_info2((hid_t)*object_id, &Oinfo, (unsigned)*fields) < 0)
     HGOTO_DONE(FAIL);
 
   ret_value = fill_h5o_info_t_f(Oinfo,object_info);
@@ -457,8 +468,8 @@ h5oget_info_c (hid_t_f *object_id, H5O_info_t_f *object_info)
 */
 int_f
 h5ocopy_c (hid_t_f *src_loc_id, _fcd src_name, size_t_f *src_name_len,
-	    hid_t_f *dst_loc_id, _fcd dst_name, size_t_f *dst_name_len, 
-	    hid_t_f *ocpypl_id, hid_t_f *lcpl_id )
+           hid_t_f *dst_loc_id, _fcd dst_name, size_t_f *dst_name_len, 
+           hid_t_f *ocpypl_id, hid_t_f *lcpl_id )
 /******/
 {
   char *c_src_name = NULL;  /* Buffer to hold C string */
@@ -478,7 +489,7 @@ h5ocopy_c (hid_t_f *src_loc_id, _fcd src_name, size_t_f *src_name_len,
    * Call H5Ocopy function.
    */
   if(H5Ocopy( (hid_t)*src_loc_id, c_src_name, (hid_t)*dst_loc_id, c_dst_name, 
-	      (hid_t)*ocpypl_id, (hid_t)*lcpl_id) < 0)
+              (hid_t)*ocpypl_id, (hid_t)*lcpl_id) < 0)
     HGOTO_DONE(FAIL);
 
  done:
@@ -503,6 +514,7 @@ h5ocopy_c (hid_t_f *src_loc_id, _fcd src_name, size_t_f *src_name_len,
  *  idx - Iteration position at which to start
  *  op - Callback function passing data regarding the link to the calling application
  *  op_data - User-defined pointer to data required by the application for its processing of the link
+ *  fields - Flags specifying the fields to include in object_info.
  *
  * OUTPUTS
  *  idx - Position at which an interrupted iteration may be restarted
@@ -516,7 +528,7 @@ h5ocopy_c (hid_t_f *src_loc_id, _fcd src_name, size_t_f *src_name_len,
 */
 int_f
 h5ovisit_by_name_c(hid_t_f *loc_id,  _fcd object_name, size_t_f *namelen, int_f *index_type, int_f *order,
-		    H5O_iterate_t op, void *op_data, hid_t_f *lapl_id )
+                   H5O_iterate_t op, void *op_data, hid_t_f *lapl_id, int_f *fields )
 /******/
 {
   int_f ret_value = -1;       /* Return value */
@@ -533,7 +545,7 @@ h5ovisit_by_name_c(hid_t_f *loc_id,  _fcd object_name, size_t_f *namelen, int_f
    * Call H5Ovisit
    */
   func_ret_value = H5Ovisit_by_name2( (hid_t)*loc_id, c_object_name, (H5_index_t)*index_type, (H5_iter_order_t)*order,
-				     op, op_data, H5O_INFO_ALL, (hid_t)*lapl_id);
+                                      op, op_data, (unsigned)*fields, (hid_t)*lapl_id);
   ret_value = (int_f)func_ret_value;
 
  done:
@@ -763,7 +775,7 @@ h5oset_comment_by_name_c (hid_t_f *object_id, _fcd name, size_t_f *namelen,  _fc
 */
 int_f
 h5oopen_by_idx_c (hid_t_f *loc_id, _fcd  group_name, size_t_f *group_namelen, 
-		       int_f *index_type, int_f *order, hsize_t_f *n, hid_t_f *obj_id, hid_t_f *lapl_id)
+                  int_f *index_type, int_f *order, hsize_t_f *n, hid_t_f *obj_id, hid_t_f *lapl_id)
 /******/
 {
   char *c_group_name = NULL;     /* Buffer to hold C string */
@@ -868,7 +880,7 @@ h5oget_comment_c (hid_t_f *object_id, _fcd comment, size_t_f *commentsize,  hssi
 */
 int_f
 h5oget_comment_by_name_c (hid_t_f *loc_id, _fcd name, size_t_f *name_size, 
-			   _fcd comment, size_t_f *commentsize, size_t_f *bufsize, hid_t_f *lapl_id)
+                          _fcd comment, size_t_f *commentsize, size_t_f *bufsize, hid_t_f *lapl_id)
 /******/
 {
   char *c_comment = NULL;  /* Buffer to hold C string */
diff --git a/fortran/src/H5Off.F90 b/fortran/src/H5Off.F90
index 243ec29..8c77230 100644
--- a/fortran/src/H5Off.F90
+++ b/fortran/src/H5Off.F90
@@ -69,6 +69,15 @@ MODULE H5O
      TYPE(mesg_t)   :: mesg
   END TYPE hdr_t
 
+  TYPE, BIND(C) :: c_hdr_t
+     INTEGER(C_INT) :: version ! Version number of header format in file
+     INTEGER(C_INT) :: nmesgs  ! Number of object header messages
+     INTEGER(C_INT) :: nchunks ! Number of object header chunks
+     INTEGER(C_INT) :: flags   ! Object header status flags
+     TYPE(space_t)  :: space   
+     TYPE(mesg_t)   :: mesg
+  END TYPE c_hdr_t
+
   ! Extra metadata storage for obj & attributes
   TYPE, BIND(C) :: H5_ih_info_t
      INTEGER(hsize_t) :: index_size ! btree and/or list
@@ -83,7 +92,7 @@ MODULE H5O
   TYPE, BIND(C) :: h5o_info_t
      INTEGER(C_LONG)  :: fileno     ! File number that object is located in
      INTEGER(haddr_t) :: addr       ! Object address in file  
-     INTEGER(C_INT)   :: type       ! Basic object type (group, dataset, etc.) 
+     INTEGER(C_INT)   :: type       ! Basic object type (group, dataset, etc.)
      INTEGER          :: rc         ! Reference count of object
 
      INTEGER, DIMENSION(8) :: atime ! Access time         !    -- NOTE --
@@ -98,6 +107,28 @@ MODULE H5O
      TYPE(meta_size_t) :: meta_size
   END TYPE h5o_info_t
 
+! C interoperable structure for h5o_info_t. The Fortran derived type returns the time
+! values as an integer array as specified in the Fortran intrinsic DATE_AND_TIME(VALUES).
+! Whereas, this derived type does not.
+
+  TYPE, BIND(C) :: c_h5o_info_t
+     INTEGER(C_LONG)  :: fileno     ! File number that object is located in
+     INTEGER(haddr_t) :: addr       ! Object address in file  
+     INTEGER(C_INT)   :: type       ! Basic object type (group, dataset, etc.)
+     INTEGER(C_INT)   :: rc         ! Reference count of object
+
+     INTEGER(KIND=TIME_T) :: atime ! Access time
+     INTEGER(KIND=TIME_T) :: mtime ! modify time
+     INTEGER(KIND=TIME_T) :: ctime ! create time
+     INTEGER(KIND=TIME_T) :: btime ! Access time
+
+     INTEGER(hsize_t) :: num_attrs  ! # of attributes attached to object
+
+     TYPE(c_hdr_t) :: hdr
+
+     TYPE(meta_size_t) :: meta_size
+  END TYPE c_h5o_info_t
+
 !*****
 
 CONTAINS
@@ -834,12 +865,16 @@ CONTAINS
 !  return_value - returns the return value of the first operator that returns a positive value, or 
 !                 zero if all members were processed with no operator returning non-zero.
 !  hdferr       - Returns 0 if successful and -1 if fails
+!
+! Optional parameters:
+!  fields      - Flags specifying the fields to include in object_info.
+!
 ! AUTHOR
 !  M. Scot Breitenfeld
 !  November 19, 2008
 !
 ! Fortran2003 Interface:
-  SUBROUTINE h5ovisit_f(object_id, index_type, order, op, op_data, return_value, hdferr)
+  SUBROUTINE h5ovisit_f(object_id, index_type, order, op, op_data, return_value, hdferr, fields)
     IMPLICIT NONE
     INTEGER(HID_T), INTENT(IN) :: object_id
     INTEGER, INTENT(IN) :: index_type 
@@ -849,10 +884,12 @@ CONTAINS
     TYPE(C_PTR)   :: op_data
     INTEGER, INTENT(OUT) :: return_value
     INTEGER, INTENT(OUT) :: hdferr
+    INTEGER, INTENT(IN), OPTIONAL  :: fields 
 !*****
+    INTEGER :: fields_c
 
     INTERFACE
-       INTEGER FUNCTION h5ovisit_c(object_id, index_type, order, op, op_data) &
+       INTEGER FUNCTION h5ovisit_c(object_id, index_type, order, op, op_data, fields) &
             BIND(C, NAME='h5ovisit_c')
          IMPORT :: C_FUNPTR, C_PTR
          IMPORT :: HID_T
@@ -862,10 +899,14 @@ CONTAINS
          INTEGER, INTENT(IN) :: order
          TYPE(C_FUNPTR), VALUE :: op
          TYPE(C_PTR), VALUE :: op_data
+         INTEGER, INTENT(IN) :: fields
        END FUNCTION h5ovisit_c
     END INTERFACE
 
-    return_value = h5ovisit_c(object_id, index_type, order, op, op_data)
+    fields_c = H5O_INFO_ALL_F
+    IF(PRESENT(fields)) fields_c = fields
+
+    return_value = h5ovisit_c(object_id, index_type, order, op, op_data, fields_c)
 
     IF(return_value.GE.0)THEN
        hdferr = 0
@@ -894,26 +935,29 @@ CONTAINS
 !
 ! Optional parameters:
 !  lapl_id     - Link access property list.
+!  fields      - Flags specifying the fields to include in object_info.
 !
 ! AUTHOR
 !  M. Scot Breitenfeld
 !  December 1, 2008
 !
 ! Fortran2003 Interface:
-  SUBROUTINE h5oget_info_by_name_f(loc_id, name, object_info, hdferr, lapl_id)
+  SUBROUTINE h5oget_info_by_name_f(loc_id, name, object_info, hdferr, lapl_id, fields)
     IMPLICIT NONE
     INTEGER(HID_T)  , INTENT(IN)            :: loc_id
     CHARACTER(LEN=*), INTENT(IN)            :: name
     TYPE(h5o_info_t), INTENT(OUT), TARGET   :: object_info
     INTEGER         , INTENT(OUT)           :: hdferr
     INTEGER(HID_T)  , INTENT(IN) , OPTIONAL :: lapl_id
+    INTEGER         , INTENT(IN) , OPTIONAL :: fields 
 !*****
     INTEGER(SIZE_T) :: namelen
     INTEGER(HID_T)  :: lapl_id_default
     TYPE(C_PTR)     :: ptr
+    INTEGER :: fields_c
     
     INTERFACE
-       INTEGER FUNCTION h5oget_info_by_name_c(loc_id, name, namelen, lapl_id_default, object_info) &
+       INTEGER FUNCTION h5oget_info_by_name_c(loc_id, name, namelen, lapl_id_default, object_info, fields) &
             BIND(C, NAME='h5oget_info_by_name_c')
          IMPORT :: c_char, c_ptr
          IMPORT :: HID_T, SIZE_T
@@ -923,10 +967,13 @@ CONTAINS
          INTEGER(SIZE_T) , INTENT(IN)  :: namelen
          INTEGER(HID_T)  , INTENT(IN)  :: lapl_id_default
          TYPE(C_PTR),VALUE             :: object_info
-
+         INTEGER         , INTENT(IN)  :: fields
        END FUNCTION h5oget_info_by_name_c
     END INTERFACE
 
+    fields_c = H5O_INFO_ALL_F
+    IF(PRESENT(fields)) fields_c = fields
+
     namelen = LEN(name)
 
     lapl_id_default = H5P_DEFAULT_F
@@ -934,7 +981,7 @@ CONTAINS
 
     ptr = C_LOC(object_info)
 
-    hdferr = H5Oget_info_by_name_c(loc_id, name, namelen, lapl_id_default, ptr)
+    hdferr = H5Oget_info_by_name_c(loc_id, name, namelen, lapl_id_default, ptr, fields_c)
 
   END SUBROUTINE H5Oget_info_by_name_f
 
@@ -953,34 +1000,43 @@ CONTAINS
 !  object_info - Buffer in which to return object information.
 !  hdferr      - Returns 0 if successful and -1 if fails.
 !
+! Optional parameters:
+!  fields      - Flags specifying the fields to include in object_info.
+!
 ! AUTHOR
 !  M. Scot Breitenfeld
 !  May 11, 2012
 !
 ! Fortran2003 Interface:
-  SUBROUTINE h5oget_info_f(object_id, object_info, hdferr)
+  SUBROUTINE h5oget_info_f(object_id, object_info, hdferr, fields)
 
     USE, INTRINSIC :: ISO_C_BINDING
     IMPLICIT NONE
     INTEGER(HID_T)  , INTENT(IN)            :: object_id
     TYPE(h5o_info_t), INTENT(OUT), TARGET   :: object_info
     INTEGER         , INTENT(OUT)           :: hdferr
+    INTEGER         , INTENT(IN), OPTIONAL  :: fields 
 !*****
     TYPE(C_PTR) :: ptr
-    
+    INTEGER :: fields_c
+
     INTERFACE
-       INTEGER FUNCTION h5oget_info_c(object_id, object_info) &
+       INTEGER FUNCTION h5oget_info_c(object_id, object_info, fields) &
             BIND(C, NAME='h5oget_info_c')
          IMPORT :: C_PTR
          IMPORT :: HID_T
          IMPLICIT NONE
          INTEGER(HID_T), INTENT(IN)  :: object_id
          TYPE(C_PTR), VALUE          :: object_info
+         INTEGER, INTENT(IN)         :: fields
        END FUNCTION h5oget_info_c
     END INTERFACE
 
+    fields_c = H5O_INFO_ALL_F
+    IF(PRESENT(fields)) fields_c = fields
+
     ptr = C_LOC(object_info)
-    hdferr = H5Oget_info_c(object_id, ptr)
+    hdferr = H5Oget_info_c(object_id, ptr, fields_c)
 
   END SUBROUTINE H5Oget_info_f
 
@@ -1006,6 +1062,7 @@ CONTAINS
 !
 ! Optional parameters:
 !  lapl_id     - Link access property list. (Not currently used.)
+!  fields      - Flags specifying the fields to include in object_info.
 !
 ! AUTHOR
 !  M. Scot Breitenfeld
@@ -1013,7 +1070,7 @@ CONTAINS
 !
 ! Fortran2003 Interface:
   SUBROUTINE h5oget_info_by_idx_f(loc_id, group_name, index_field, order, n, &
-       object_info, hdferr, lapl_id)
+       object_info, hdferr, lapl_id, fields)
 
     USE, INTRINSIC :: ISO_C_BINDING
     IMPLICIT NONE
@@ -1025,14 +1082,16 @@ CONTAINS
     TYPE(h5o_info_t), INTENT(OUT), TARGET   :: object_info
     INTEGER         , INTENT(OUT)           :: hdferr
     INTEGER(HID_T)  , INTENT(IN) , OPTIONAL :: lapl_id
+    INTEGER         , INTENT(IN) , OPTIONAL :: fields 
 !*****
     INTEGER(SIZE_T) :: namelen
     INTEGER(HID_T)  :: lapl_id_default
     TYPE(C_PTR)     :: ptr
+    INTEGER         :: fields_c
     
     INTERFACE
        INTEGER FUNCTION h5oget_info_by_idx_c(loc_id, group_name, namelen, &
-            index_field, order, n, lapl_id_default, object_info) BIND(C, NAME='h5oget_info_by_idx_c')
+            index_field, order, n, lapl_id_default, object_info, fields) BIND(C, NAME='h5oget_info_by_idx_c')
          IMPORT :: c_char, c_ptr, c_funptr
          IMPORT :: HID_T, SIZE_T, HSIZE_T
          INTEGER(HID_T)  , INTENT(IN)  :: loc_id
@@ -1043,17 +1102,20 @@ CONTAINS
          INTEGER(HSIZE_T), INTENT(IN)  :: n
          INTEGER(HID_T)  , INTENT(IN)  :: lapl_id_default
          TYPE(C_PTR), VALUE            :: object_info
-
+         INTEGER, INTENT(IN)           :: fields
        END FUNCTION h5oget_info_by_idx_c
     END INTERFACE
 
+    fields_c = H5O_INFO_ALL_F
+    IF(PRESENT(fields)) fields_c = fields
+
     namelen = LEN(group_name)
 
     lapl_id_default = H5P_DEFAULT_F
     IF(PRESENT(lapl_id)) lapl_id_default = lapl_id
 
     ptr = C_LOC(object_info)
-    hdferr = H5Oget_info_by_idx_c(loc_id, group_name, namelen, index_field, order, n, lapl_id_default, ptr)
+    hdferr = H5Oget_info_by_idx_c(loc_id, group_name, namelen, index_field, order, n, lapl_id_default, ptr, fields_c)
 
   END SUBROUTINE H5Oget_info_by_idx_f
 
@@ -1086,6 +1148,7 @@ CONTAINS
 !
 ! Optional parameters:
 !  lapl_id      - Link access property list identifier.
+!  fields       - Flags specifying the fields to include in object_info.
 !
 ! AUTHOR
 !  M. Scot Breitenfeld
@@ -1093,7 +1156,7 @@ CONTAINS
 !
 ! Fortran2003 Interface:
   SUBROUTINE h5ovisit_by_name_f(loc_id, object_name, index_type, order, op, op_data, &
-       return_value, hdferr, lapl_id)
+       return_value, hdferr, lapl_id, fields)
     IMPLICIT NONE
     INTEGER(HID_T)  , INTENT(IN)             :: loc_id
     CHARACTER(LEN=*), INTENT(IN)             :: object_name
@@ -1105,14 +1168,16 @@ CONTAINS
     INTEGER         , INTENT(OUT)            :: return_value
     INTEGER         , INTENT(OUT)            :: hdferr
     INTEGER(HID_T)  , INTENT(IN) , OPTIONAL  :: lapl_id
+    INTEGER         , INTENT(IN) , OPTIONAL  :: fields 
 !*****
 
     INTEGER(SIZE_T) :: namelen
     INTEGER(HID_T)  :: lapl_id_default
+    INTEGER :: fields_c
 
     INTERFACE
        INTEGER FUNCTION h5ovisit_by_name_c(loc_id, object_name, namelen, index_type, order, &
-            op, op_data, lapl_id) BIND(C, NAME='h5ovisit_by_name_c')
+            op, op_data, lapl_id, fields) BIND(C, NAME='h5ovisit_by_name_c')
          IMPORT :: C_CHAR, C_PTR, C_FUNPTR
          IMPORT :: HID_T, SIZE_T
          IMPLICIT NONE
@@ -1124,16 +1189,20 @@ CONTAINS
          TYPE(C_FUNPTR)  , VALUE      :: op
          TYPE(C_PTR)     , VALUE      :: op_data
          INTEGER(HID_T)  , INTENT(IN) :: lapl_id
+         INTEGER         , INTENT(IN) :: fields
        END FUNCTION h5ovisit_by_name_c
     END INTERFACE
 
+    fields_c = H5O_INFO_ALL_F
+    IF(PRESENT(fields)) fields_c = fields
+
     namelen = LEN(object_name)
 
     lapl_id_default = H5P_DEFAULT_F
     IF(PRESENT(lapl_id)) lapl_id_default = lapl_id
 
     return_value = h5ovisit_by_name_c(loc_id, object_name, namelen, index_type, order, &
-         op, op_data, lapl_id_default)
+         op, op_data, lapl_id_default, fields_c)
 
     IF(return_value.GE.0)THEN
        hdferr = 0
diff --git a/fortran/src/H5Pff.F90 b/fortran/src/H5Pff.F90
index 455c72e..13a2953 100644
--- a/fortran/src/H5Pff.F90
+++ b/fortran/src/H5Pff.F90
@@ -8023,8 +8023,97 @@ SUBROUTINE h5pget_virtual_dsetname_f(dcpl_id, index, name, hdferr, name_len)
 
 END SUBROUTINE h5pget_virtual_dsetname_f
 
+!****s* H5P (F03)/h5pget_dset_no_attrs_hint_f_F03
+!
+! NAME
+!  h5pget_dset_no_attrs_hint_f
+!
+! PURPOSE
+!  Gets the value of the "minimize dataset headers" value which creates
+!  smaller dataset object headers when its set and no attributes are present.
+!
+! INPUTS
+!  dcpl_id    - Target dataset creation property list identifier.
+!
+! OUTPUTS
+!  minimize   - Value of the setting.
+!  hdferr     - error code:
+!                 0 on success and -1 on failure
+!
+! AUTHOR
+!  Dana Robinson
+!  January 2019
+!
+! Fortran2003 Interface:
+  SUBROUTINE h5pget_dset_no_attrs_hint_f(dcpl_id, minimize, hdferr)
+    IMPLICIT NONE
+    INTEGER(HID_T) , INTENT(IN)              :: dcpl_id
+    LOGICAL        , INTENT(OUT)             :: minimize
+    INTEGER        , INTENT(OUT)             :: hdferr
+!*****
+    LOGICAL(C_BOOL) :: c_minimize
 
-END MODULE H5P
+    INTERFACE
+       INTEGER FUNCTION h5pget_dset_no_attrs_hint_c(dcpl_id, minimize) BIND(C, NAME='H5Pget_dset_no_attrs_hint')
+         IMPORT :: HID_T, C_BOOL
+         IMPLICIT NONE
+         INTEGER(HID_T), INTENT(IN), VALUE :: dcpl_id
+         LOGICAL(C_BOOL), INTENT(OUT) :: minimize
+       END FUNCTION h5pget_dset_no_attrs_hint_c
+    END INTERFACE
+
+    hdferr = INT(h5pget_dset_no_attrs_hint_c(dcpl_id, c_minimize))
 
+    ! Transfer value of C C_BOOL type to Fortran LOGICAL 
+    minimize = c_minimize
 
+   END SUBROUTINE h5pget_dset_no_attrs_hint_f
+
+!****s* H5P (F03)/h5pset_dset_no_attrs_hint_f_F03
+!
+! NAME
+!  h5pset_dset_no_attrs_hint_f
+!
+! PURPOSE
+!  Sets the value of the "minimize dataset headers" value which creates
+!  smaller dataset object headers when its set and no attributes are present.
+!
+! INPUTS
+!  dcpl_id    - Target dataset creation property list identifier.
+!  minimize   - Value of the setting.
+!
+! OUTPUTS
+!  hdferr     - error code:
+!                 0 on success and -1 on failure
+!
+! AUTHOR
+!  Dana Robinson
+!  January 2019
+!
+! Fortran2003 Interface:
+  SUBROUTINE h5pset_dset_no_attrs_hint_f(dcpl_id, minimize, hdferr)
+    IMPLICIT NONE
+    INTEGER(HID_T) , INTENT(IN)              :: dcpl_id
+    LOGICAL        , INTENT(IN)              :: minimize
+    INTEGER        , INTENT(OUT)             :: hdferr
+!*****
+    LOGICAL(C_BOOL) :: c_minimize
+
+    INTERFACE
+       INTEGER FUNCTION h5pset_dset_no_attrs_hint_c(dcpl_id, minimize) BIND(C, NAME='H5Pset_dset_no_attrs_hint')
+         IMPORT :: HID_T, C_BOOL
+         IMPLICIT NONE
+         INTEGER(HID_T), INTENT(IN), VALUE :: dcpl_id
+         LOGICAL(C_BOOL), INTENT(IN), VALUE :: minimize
+       END FUNCTION h5pset_dset_no_attrs_hint_c
+    END INTERFACE
+
+    ! Transfer value of Fortran LOGICAL to C C_BOOL type
+    c_minimize = minimize
+
+    hdferr = INT(h5pset_dset_no_attrs_hint_c(dcpl_id, c_minimize))
+
+  END SUBROUTINE h5pset_dset_no_attrs_hint_f
+
+END MODULE H5P
 
diff --git a/fortran/src/H5_f.c b/fortran/src/H5_f.c
index 352ffab..69ba8b3 100644
--- a/fortran/src/H5_f.c
+++ b/fortran/src/H5_f.c
@@ -556,6 +556,17 @@ h5init_flags_c( int_f *h5d_flags, size_t_f *h5d_size_flags,
       h5o_flags[24] = (int_f)H5O_TYPE_DATASET;        /* Object is a dataset */
       h5o_flags[25] = (int_f)H5O_TYPE_NAMED_DATATYPE; /* Object is a named data type */
       h5o_flags[26] = (int_f)H5O_TYPE_NTYPES;         /* Number of different object types */
+
+/* Flags for H5Oget_info.
+ * These flags determine which fields will be filled in in the H5O_info_t
+ * struct. 
+ */
+      h5o_flags[27] = (int_f)H5O_INFO_ALL; /* (H5O_INFO_BASIC|H5O_INFO_TIME|H5O_INFO_NUM_ATTRS|H5O_INFO_HDR|H5O_INFO_META_SIZE) */
+      h5o_flags[28] = (int_f)H5O_INFO_BASIC; /* Fill in the fileno, addr, type, and rc fields */
+      h5o_flags[29] = (int_f)H5O_INFO_TIME;  /* Fill in the atime, mtime, ctime, and btime fields */
+      h5o_flags[30] = (int_f)H5O_INFO_NUM_ATTRS; /* Fill in the num_attrs field */
+      h5o_flags[31] = (int_f)H5O_INFO_HDR;       /* Fill in the hdr field */
+      h5o_flags[32] = (int_f)H5O_INFO_META_SIZE; /* Fill in the meta_size field */
 /*
  *  H5P flags
  */
diff --git a/fortran/src/H5_ff.F90 b/fortran/src/H5_ff.F90
index f63e734..84529e4 100644
--- a/fortran/src/H5_ff.F90
+++ b/fortran/src/H5_ff.F90
@@ -98,8 +98,8 @@ MODULE H5LIB
   !
   ! H5O flags declaration
   !
-  INTEGER, PARAMETER :: H5O_FLAGS_LEN = 27
-  INTEGER, DIMENSION(1:H5O_FLAGS_LEN) :: H5o_flags
+  INTEGER, PARAMETER :: H5O_FLAGS_LEN = 33
+  INTEGER, DIMENSION(1:H5O_FLAGS_LEN) :: H5O_flags
   !
   ! H5P flags declaration
   !
@@ -139,8 +139,8 @@ MODULE H5LIB
   !
   INTEGER, PARAMETER :: H5LIB_FLAGS_LEN =  2
   INTEGER, DIMENSION(1:H5LIB_FLAGS_LEN) :: H5LIB_flags
-  
-  PUBLIC :: h5open_f, h5close_f, h5get_libversion_f, h5dont_atexit_f, h5kind_to_type, h5offsetof
+
+  PUBLIC :: h5open_f, h5close_f, h5get_libversion_f, h5dont_atexit_f, h5kind_to_type, h5offsetof, h5gmtime
   PUBLIC :: h5garbage_collect_f, h5check_version_f
 
 CONTAINS
@@ -488,7 +488,13 @@ CONTAINS
     H5O_TYPE_GROUP_F               = h5o_flags(24) 
     H5O_TYPE_DATASET_F             = h5o_flags(25) 
     H5O_TYPE_NAMED_DATATYPE_F      = h5o_flags(26) 
-    H5O_TYPE_NTYPES_F              = h5o_flags(27) 
+    H5O_TYPE_NTYPES_F              = h5o_flags(27)
+    H5O_INFO_ALL_F                 = h5o_flags(28)
+    H5O_INFO_BASIC_F               = h5o_flags(29)
+    H5O_INFO_TIME_F                = h5o_flags(30)
+    H5O_INFO_NUM_ATTRS_F           = h5o_flags(31)
+    H5O_INFO_HDR_F                 = h5o_flags(32)
+    H5O_INFO_META_SIZE_F           = h5o_flags(33)
     !
     ! H5P flags
     !    
@@ -898,4 +904,62 @@ CONTAINS
 
   END FUNCTION h5offsetof
 
+!****f* H5LIB_PROVISIONAL/h5gmtime
+!
+! NAME
+!  h5gmtime
+!
+! PURPOSE
+!  Convert time_t structure (C) to Fortran DATE AND TIME storage format.
+!
+! Inputs:
+!  stdtime_t - Object of type time_t that contains a time value
+!
+! Outputs:
+!   datetime - A date/time array using Fortran conventions:
+!   datetime(1)     = year
+!   datetime(2)     = month
+!   datetime(3)     = day
+!   datetime(4)     = 0 ! time is expressed as UTC (or GMT timezone) */
+!   datetime(5)     = hour
+!   datetime(6)     = minute
+!   datetime(7)     = second
+!   datetime(8)     = millisecond -- not available, assigned - HUGE(0)
+!
+! AUTHOR
+!  M. Scot Breitenfeld
+!  January, 2019
+!
+! Fortran Interface:
+  FUNCTION h5gmtime(stdtime_t)
+    IMPLICIT NONE
+    INTEGER(KIND=TIME_T), INTENT(IN) :: stdtime_t
+    INTEGER, DIMENSION(1:8) :: h5gmtime
+!*****
+    TYPE(C_PTR) :: cptr
+    INTEGER(C_INT), DIMENSION(:), POINTER :: c_time
+
+    INTERFACE
+       FUNCTION gmtime(stdtime_t) BIND(C, NAME='gmtime')
+         IMPORT :: TIME_T, C_PTR
+         IMPLICIT NONE
+         INTEGER(KIND=TIME_T) :: stdtime_t
+         TYPE(C_PTR) :: gmtime
+       END FUNCTION gmtime
+    END INTERFACE
+
+    cptr = gmtime(stdtime_t)
+    CALL C_F_POINTER(cptr, c_time, [9])
+
+    h5gmtime(1) = INT(c_time(6)+1900) ! year starts at 1900
+    h5gmtime(2) = INT(c_time(5)+1)    ! month starts at 0 in C
+    h5gmtime(3) = INT(c_time(4))      ! day
+    h5gmtime(4) = 0                   ! time is expressed as UTC (or GMT timezone)
+    h5gmtime(5) = INT(c_time(3))      ! hour
+    h5gmtime(6) = INT(c_time(2))      ! minute
+    h5gmtime(7) = INT(c_time(1))      ! second
+    h5gmtime(8) = -32767              ! millisecond is not available, assign it -HUGE(0)
+
+  END FUNCTION h5gmtime
+
 END MODULE H5LIB
diff --git a/fortran/src/H5f90global.F90 b/fortran/src/H5f90global.F90
index 078778a..b705cc1 100644
--- a/fortran/src/H5f90global.F90
+++ b/fortran/src/H5f90global.F90
@@ -493,6 +493,13 @@ MODULE H5GLOBAL
   !DEC$ATTRIBUTES DLLEXPORT :: H5O_TYPE_DATASET_F
   !DEC$ATTRIBUTES DLLEXPORT :: H5O_TYPE_NAMED_DATATYPE_F
   !DEC$ATTRIBUTES DLLEXPORT :: H5O_TYPE_NTYPES_F
+  !DEC$ATTRIBUTES DLLEXPORT :: H5O_INFO_ALL_F
+  !DEC$ATTRIBUTES DLLEXPORT :: H5O_INFO_BASIC_F
+  !DEC$ATTRIBUTES DLLEXPORT :: H5O_INFO_TIME_F
+  !DEC$ATTRIBUTES DLLEXPORT :: H5O_INFO_NUM_ATTRS_F
+  !DEC$ATTRIBUTES DLLEXPORT :: H5O_INFO_HDR_F
+  !DEC$ATTRIBUTES DLLEXPORT :: H5O_INFO_META_SIZE_F
+  !
   !DEC$endif
   
   INTEGER :: H5O_COPY_SHALLOW_HIERARCHY_F ! *** THESE VARIABLES DO
@@ -522,6 +529,12 @@ MODULE H5GLOBAL
   INTEGER :: H5O_TYPE_DATASET_F
   INTEGER :: H5O_TYPE_NAMED_DATATYPE_F
   INTEGER :: H5O_TYPE_NTYPES_F
+  INTEGER :: H5O_INFO_ALL_F
+  INTEGER :: H5O_INFO_BASIC_F
+  INTEGER :: H5O_INFO_TIME_F
+  INTEGER :: H5O_INFO_NUM_ATTRS_F
+  INTEGER :: H5O_INFO_HDR_F
+  INTEGER :: H5O_INFO_META_SIZE_F
   !
   ! H5P flags declaration
   !
diff --git a/fortran/src/H5f90proto.h b/fortran/src/H5f90proto.h
index 0884eb6..56b7f22 100644
--- a/fortran/src/H5f90proto.h
+++ b/fortran/src/H5f90proto.h
@@ -314,14 +314,14 @@ H5_FCDLL int_f h5oclose_c(hid_t_f *object_id );
 H5_FCDLL int_f h5oopen_by_addr_c(hid_t_f *loc_id, haddr_t_f *addr, hid_t_f *obj_id);
 H5_FCDLL int_f h5olink_c(hid_t_f *object_id, hid_t_f *new_loc_id, _fcd name, size_t_f *namelen,
 			   hid_t_f *lcpl_id, hid_t_f *lapl_id);
-H5_FCDLL int_f h5ovisit_c(hid_t_f *group_id, int_f *index_type, int_f *order, H5O_iterate_t op, void *op_data);
+H5_FCDLL int_f h5ovisit_c(hid_t_f *group_id, int_f *index_type, int_f *order, H5O_iterate_t op, void *op_data, int_f *fields);
 H5_FCDLL int_f h5ovisit_by_name_c(hid_t_f *loc_id,  _fcd object_name, size_t_f *namelen, int_f *index_type, int_f *order,
-				   H5O_iterate_t op, void *op_data, hid_t_f *lapl_id );
-H5_FCDLL int_f h5oget_info_c(hid_t_f *object_id, H5O_info_t_f *object_info);
+				   H5O_iterate_t op, void *op_data, hid_t_f *lapl_id, int_f *fields );
+H5_FCDLL int_f h5oget_info_c(hid_t_f *object_id, H5O_info_t_f *object_info, int_f *fields);
 H5_FCDLL int_f h5oget_info_by_idx_c(hid_t_f *loc_id, _fcd  group_name, size_t_f *namelen, 
-				      int_f *index_field, int_f *order, hsize_t_f *n, hid_t_f *lapl_id, H5O_info_t_f *object_info);
+				      int_f *index_field, int_f *order, hsize_t_f *n, hid_t_f *lapl_id, H5O_info_t_f *object_info, int_f *fields);
 H5_FCDLL int_f h5oget_info_by_name_c(hid_t_f *loc_id, _fcd name, size_t_f *namelen, hid_t_f *lapl_id,
-				       H5O_info_t_f *object_info);
+				       H5O_info_t_f *object_info, int_f *fields);
 H5_FCDLL int_f h5ocopy_c(hid_t_f *src_loc_id, _fcd src_name, size_t_f *src_name_len,
 			   hid_t_f *dst_loc_id, _fcd dst_name, size_t_f *dst_name_len, 
 			   hid_t_f *ocpypl_id, hid_t_f *lcpl_id );
diff --git a/fortran/src/H5match_types.c b/fortran/src/H5match_types.c
index 7e0b7e8..57f7dda 100644
--- a/fortran/src/H5match_types.c
+++ b/fortran/src/H5match_types.c
@@ -191,6 +191,8 @@ int main(void)
       }
     if(sizeof(size_t) == IntKinds_SizeOf[i])
       writeTypedef("size_t", "size_t", IntKinds[i]);
+    if(sizeof(time_t) == IntKinds_SizeOf[i])
+      writeTypedef("time_t", "time_t", IntKinds[i]);
     if(sizeof(hsize_t) == IntKinds_SizeOf[i])
       writeTypedef("hsize_t", "hsize_t", IntKinds[i]);
   }
@@ -306,6 +308,17 @@ int main(void)
       return -1;
   }
 
+  /* time_t */
+  for(i=0;i< FORTRAN_NUM_INTEGER_KINDS;i++) {
+    if(IntKinds_SizeOf[i] == H5_SIZEOF_TIME_T) {
+      writeToFiles("time_t","TIME_T", "time_t_f", IntKinds[i]);
+      break;
+    }
+    if(i == (FORTRAN_NUM_INTEGER_KINDS-1) )
+      /* Error: couldn't find a size for time_t */
+      return -1;
+  }
+
   /* int */
   writeToFiles("int","Fortran_INTEGER", "int_f", H5_FORTRAN_NATIVE_INTEGER_KIND);
 
diff --git a/fortran/src/hdf5_fortrandll.def.in b/fortran/src/hdf5_fortrandll.def.in
index 2edba5a..a99efad 100644
--- a/fortran/src/hdf5_fortrandll.def.in
+++ b/fortran/src/hdf5_fortrandll.def.in
@@ -8,6 +8,7 @@ H5LIB_mp_H5GARBAGE_COLLECT_F
 H5LIB_mp_H5DONT_ATEXIT_F
 H5LIB_mp_H5KIND_TO_TYPE
 H5LIB_mp_H5OFFSETOF
+H5LIB_mp_H5GMTIME
 ; H5A
 H5A_mp_H5AWRITE_CHAR_SCALAR
 H5A_mp_H5AREAD_CHAR_SCALAR
@@ -99,6 +100,8 @@ H5F_mp_H5FIS_HDF5_F
 H5F_mp_H5FGET_NAME_F
 H5F_mp_H5FGET_FILESIZE_F
 H5F_mp_H5FGET_FILE_IMAGE_F
+H5F_mp_H5FGET_DSET_NO_ATTRS_HINT_F
+H5F_mp_H5FSET_DSET_NO_ATTRS_HINT_F
 ; H5G
 H5G_mp_H5GOPEN_F
 H5G_mp_H5GCREATE_F
@@ -329,6 +332,8 @@ H5P_mp_H5PGET_VIRTUAL_VSPACE_F
 H5P_mp_H5PGET_VIRTUAL_SRCSPACE_F
 H5P_mp_H5PGET_VIRTUAL_FILENAME_F
 H5P_mp_H5PGET_VIRTUAL_DSETNAME_F
+H5P_mp_H5PGET_DSET_NO_ATTRS_HINT_F
+H5P_mp_H5PSET_DSET_NO_ATTRS_HINT_F
 ; Parallel
 @H5_NOPAREXP@H5P_mp_H5PSET_FAPL_MPIO_F
 @H5_NOPAREXP@H5P_mp_H5PGET_FAPL_MPIO_F
diff --git a/fortran/test/tH5F.F90 b/fortran/test/tH5F.F90
index d51803b..2501996 100644
--- a/fortran/test/tH5F.F90
+++ b/fortran/test/tH5F.F90
@@ -858,5 +858,4 @@ CONTAINS
 
         END SUBROUTINE file_space
 
-
 END MODULE TH5F
diff --git a/fortran/test/tH5O_F03.F90 b/fortran/test/tH5O_F03.F90
index 44c4bff..d1a9ddb 100644
--- a/fortran/test/tH5O_F03.F90
+++ b/fortran/test/tH5O_F03.F90
@@ -58,21 +58,224 @@ MODULE visit_cb
   TYPE, bind(c) :: ovisit_ud_t
      INTEGER :: idx              ! Index in object visit structure
      TYPE(obj_visit_t), DIMENSION(1:info_size) :: info   ! Pointer to the object visit structure to use
+     INTEGER :: field
   END TYPE ovisit_ud_t
 
 CONTAINS
 
-  INTEGER FUNCTION visit_obj_cb( group_id, name, oinfo, op_data) bind(C)
+! Compares the field values of a C h5O_info_t and a Fortran H5O_info_t. 
+
+  INTEGER FUNCTION compare_h5o_info_t( oinfo_f, oinfo_c, field, full_f_field ) RESULT(status)
+    
+    IMPLICIT NONE
+    TYPE(h5o_info_t)   :: oinfo_f
+    TYPE(c_h5o_info_t) :: oinfo_c
+    INTEGER :: field
+    LOGICAL :: full_f_field ! All the fields of Fortran H5O_info_t where filled 
+!   local
+    INTEGER(C_INT), DIMENSION(1:8) :: atime, btime, ctime, mtime
+    INTEGER :: i
+
+    status = 0
+    
+    IF( (field .EQ. H5O_INFO_BASIC_F).OR.(field .EQ. H5O_INFO_ALL_F) )THEN
+       IF( (oinfo_f%fileno.LE.0) .OR. (oinfo_c%fileno .NE. oinfo_f%fileno) )THEN
+          status = -1
+          RETURN
+       ENDIF
+       IF( (oinfo_f%addr.LE.0) .OR. (oinfo_c%addr .NE. oinfo_f%addr) )THEN
+          status = -1
+          RETURN
+       ENDIF
+       IF( (oinfo_f%type.LT.0) .OR. (oinfo_c%type .NE. oinfo_f%type) )THEN
+          status = -1
+          RETURN
+       ENDIF
+       IF( (oinfo_f%rc.LT.0) .OR. (oinfo_c%rc .NE. oinfo_f%rc) )THEN
+          status = -1
+          RETURN
+       ENDIF
+
+    ENDIF
+
+    IF((field .EQ. H5O_INFO_TIME_F).OR.(field .EQ. H5O_INFO_ALL_F))THEN
+
+       atime(1:8) = h5gmtime(oinfo_c%atime)
+       btime(1:8) = h5gmtime(oinfo_c%btime)
+       ctime(1:8) = h5gmtime(oinfo_c%ctime)
+       mtime(1:8) = h5gmtime(oinfo_c%mtime)
+
+       DO i = 1, 8
+          IF( (atime(i) .NE. oinfo_f%atime(i)) )THEN
+             status = -1
+             RETURN
+          ENDIF
+
+          IF( (btime(i) .NE. oinfo_f%btime(i)) )THEN
+             status = -1
+             RETURN
+          ENDIF
+
+          IF( (ctime(i) .NE. oinfo_f%ctime(i)) )THEN
+             status = -1
+             RETURN
+          ENDIF
+
+          IF( (mtime(i) .NE. oinfo_f%mtime(i)) )THEN
+             status = -1
+             RETURN
+          ENDIF
+       ENDDO
+
+    ELSE IF(field .EQ. H5O_INFO_TIME_F.AND. full_f_field)THEN
+       ! check other field values are not filled (using only a small subset to check)
+       status = 0
+       IF( oinfo_c%fileno .NE. oinfo_f%fileno) status = status + 1
+       IF( oinfo_c%addr .NE. oinfo_f%addr) status = status + 1
+       IF( oinfo_c%type .NE. oinfo_f%type) status = status + 1
+       IF( oinfo_c%rc .NE. oinfo_f%rc) status = status + 1
+       IF(status.EQ.0) THEN ! There was no difference found, which is only possible if the field was filled.
+          status = -1
+          RETURN
+       ENDIF
+       status = 0 ! reset
+    ENDIF
+
+    IF((field .EQ. H5O_INFO_NUM_ATTRS_F).OR.(field .EQ. H5O_INFO_ALL_F))THEN
+       IF( (oinfo_f%num_attrs.LT.0) .OR. (oinfo_c%num_attrs .NE. oinfo_f%num_attrs) )THEN
+          status = -1
+          RETURN
+       ENDIF
+    ELSE IF( field .EQ. H5O_INFO_ALL_F.AND.full_f_field)THEN
+       ! check other field values are not filled (using only a small subset to check)
+       status = 0
+       IF( oinfo_c%fileno .NE. oinfo_f%fileno) status = status + 1
+       IF( oinfo_c%addr .NE. oinfo_f%addr) status = status + 1
+       IF( oinfo_c%type .NE. oinfo_f%type) status = status + 1
+       IF( oinfo_c%rc .NE. oinfo_f%rc) status = status + 1
+       IF(status.EQ.0) THEN ! There was no difference found, which is only possible if the field was filled.
+          status = -1
+          RETURN
+       ENDIF
+       status = 0 ! reset
+       
+    ENDIF
+
+    IF((field).EQ.H5O_INFO_HDR_F.OR.(field .EQ. H5O_INFO_ALL_F))THEN
+       IF( (oinfo_f%hdr%version.LT.0) .OR. (oinfo_c%hdr%version .NE. oinfo_f%hdr%version) )THEN
+          status = -1
+          RETURN
+       ENDIF
+       IF( (oinfo_f%hdr%nmesgs.LT.0) .OR. (oinfo_c%hdr%nmesgs .NE. oinfo_f%hdr%nmesgs) )THEN
+          status = -1
+          RETURN
+       ENDIF
+       IF( (oinfo_f%hdr%nchunks.LT.0) .OR. (oinfo_c%hdr%nchunks .NE. oinfo_f%hdr%nchunks) )THEN
+          status = -1
+          RETURN
+       ENDIF
+       IF( (oinfo_f%hdr%flags.LT.0) .OR. (oinfo_c%hdr%flags .NE. oinfo_f%hdr%flags) )THEN
+          status = -1
+          RETURN
+       ENDIF
+       IF( (oinfo_f%hdr%space%total.LT.0) .OR. (oinfo_c%hdr%space%total .NE. oinfo_f%hdr%space%total) )THEN
+          status = -1
+          RETURN
+       ENDIF
+       IF( (oinfo_f%hdr%space%meta.LT.0) .OR. (oinfo_c%hdr%space%meta .NE. oinfo_f%hdr%space%meta) )THEN
+          status = -1
+          RETURN
+       ENDIF
+       IF( (oinfo_f%hdr%space%mesg.LT.0) .OR. (oinfo_c%hdr%space%mesg .NE. oinfo_f%hdr%space%mesg) )THEN
+          status = -1
+          RETURN
+       ENDIF
+       IF( (oinfo_f%hdr%space%free.LT.0) .OR. (oinfo_c%hdr%space%free .NE. oinfo_f%hdr%space%free) )THEN
+          status = -1
+          RETURN
+       ENDIF
+       IF( (oinfo_f%hdr%mesg%present.LT.0) .OR. (oinfo_c%hdr%mesg%present .NE. oinfo_f%hdr%mesg%present) )THEN
+          status = -1
+          RETURN
+       ENDIF
+       IF( (oinfo_f%hdr%mesg%shared.LT.0) .OR. (oinfo_c%hdr%mesg%shared .NE. oinfo_f%hdr%mesg%shared) )THEN
+          status = -1
+          RETURN
+       ENDIF
+    ELSE IF( field .EQ. H5O_INFO_HDR_F.AND.full_f_field)THEN
+       ! check other field values are not filled (using only a small subset to check)
+       status = 0
+       IF( oinfo_c%fileno .NE. oinfo_f%fileno) status = status + 1
+       IF( oinfo_c%addr .NE. oinfo_f%addr) status = status + 1
+       IF( oinfo_c%type .NE. oinfo_f%type) status = status + 1
+       IF( oinfo_c%rc .NE. oinfo_f%rc) status = status + 1
+       IF(status.EQ.0) THEN ! There was no difference found, which is only possible if the field was filled.
+          status = -1
+          RETURN
+       ENDIF
+       status = 0 ! reset
+    ENDIF
+    IF((field).EQ.H5O_INFO_META_SIZE_F.OR.(field .EQ. H5O_INFO_ALL_F))THEN
+       IF((oinfo_f%meta_size%obj%index_size.LT.0).OR.(oinfo_c%meta_size%obj%index_size.NE.oinfo_f%meta_size%obj%index_size))THEN
+          status = -1
+          RETURN
+       ENDIF
+       IF((oinfo_f%meta_size%obj%heap_size.LT.0).OR.(oinfo_c%meta_size%obj%heap_size.NE.oinfo_f%meta_size%obj%heap_size))THEN
+          status = -1
+          RETURN
+       ENDIF
+       IF((oinfo_f%meta_size%attr%index_size.LT.0).OR.(oinfo_c%meta_size%attr%index_size.NE.oinfo_f%meta_size%attr%index_size))THEN
+          status = -1
+          RETURN
+       ENDIF
+       IF((oinfo_f%meta_size%attr%heap_size.LT.0).OR.(oinfo_c%meta_size%attr%heap_size.NE.oinfo_f%meta_size%attr%heap_size))THEN
+          status = -1
+          RETURN
+       ENDIF
+    ELSE IF( field .EQ. H5O_INFO_META_SIZE_F.AND.full_f_field)THEN
+       ! check other field values are not filled (using only a small subset to check)
+       status = 0
+       IF( oinfo_c%fileno .NE. oinfo_f%fileno) status = status + 1
+       IF( oinfo_c%addr .NE. oinfo_f%addr) status = status + 1
+       IF( oinfo_c%type .NE. oinfo_f%type) status = status + 1
+       IF( oinfo_c%rc .NE. oinfo_f%rc) status = status + 1
+       IF(status.EQ.0) THEN ! There was no difference found, which is only possible if the field was filled.
+          status = -1
+          RETURN
+       ENDIF
+       status = 0 ! reset
+    ENDIF
+
+  END FUNCTION compare_h5o_info_t
+
+  INTEGER FUNCTION visit_obj_cb( group_id, name, oinfo_c, op_data) bind(C)
 
     IMPLICIT NONE
 
     INTEGER(HID_T), VALUE :: group_id
     CHARACTER(LEN=1), DIMENSION(1:180) :: name
-    TYPE(h5o_info_t) :: oinfo
+    CHARACTER(LEN=180) :: name2
+    TYPE(c_h5o_info_t) :: oinfo_c
     TYPE(ovisit_ud_t) :: op_data
-
+    TYPE(h5o_info_t) ::  oinfo_f
+!
+!   MEMBER      | TYPE | MEANING                 | RANGE
+! A(1) = tm_sec	  int   seconds after the minute   0-61*
+! A(2) = tm_min	  int   minutes after the hour     0-59
+! A(3) = tm_hour  int   hours since midnight       0-23
+! A(4) = tm_mday  int   day of the month           1-31
+! A(5) = tm_mon	  int   months since January       0-11
+! A(6) = tm_year  int   years since 1900
+! A(7) = tm_wday  int   days since Sunday          0-6
+! A(8) = tm_yday  int   days since January 1       0-365
+! A(9) = tm_isdst int   Daylight Saving Time flag
+!
+    INTEGER(C_INT), DIMENSION(:), POINTER :: c_atime, c_btime, c_ctime, c_mtime
+    INTEGER(C_INT), DIMENSION(1:8) :: atime, btime, ctime, mtime
     INTEGER :: len, i
     INTEGER :: idx
+    INTEGER :: ierr
+    TYPE(C_PTR) :: cptr
 
     visit_obj_cb = 0
 
@@ -87,21 +290,53 @@ CONTAINS
     len = len - 1
 
     ! Check for correct object information
+    name2(1:180) = ""
+    DO i = 1, len
+       name2(i:i) = name(i)(1:1)
+    ENDDO
 
-    idx = op_data%idx
+    IF(op_data%field .EQ. H5O_INFO_ALL_F)THEN
 
-    DO i = 1, len
-       IF(op_data%info(idx)%path(i)(1:1) .NE. name(i)(1:1))THEN
-          visit_obj_cb = -1
-          RETURN
-       ENDIF
-       
-       IF(op_data%info(idx)%type_obj .NE. oinfo%type)THEN
-          visit_obj_cb = -1
-          RETURN
-       ENDIF
+       idx = op_data%idx
+     
+       DO i = 1, len
+          IF(op_data%info(idx)%path(i)(1:1) .NE. name(i)(1:1))THEN
+             visit_obj_cb = -1
+             RETURN
+          ENDIF
+          
+          IF(op_data%info(idx)%type_obj .NE. oinfo_c%type)THEN
+             visit_obj_cb = -1
+             RETURN
+          ENDIF
+       ENDDO
 
-    ENDDO
+    ENDIF
+
+    ! Check H5Oget_info_by_name_f; if partial field values where filled correctly
+    CALL H5Oget_info_by_name_f(group_id, name2, oinfo_f, ierr);
+    visit_obj_cb =  compare_h5o_info_t( oinfo_f, oinfo_c, op_data%field, .TRUE. )
+    IF(visit_obj_cb.EQ.-1) RETURN
+
+    ! Check H5Oget_info_by_name_f, only check field values
+    CALL H5Oget_info_by_name_f(group_id, name2, oinfo_f, ierr, fields = op_data%field);
+    visit_obj_cb =  compare_h5o_info_t( oinfo_f, oinfo_c, op_data%field, .FALSE. )
+    IF(visit_obj_cb.EQ.-1) RETURN
+
+
+    IF(op_data%idx.EQ.1)THEN
+
+       ! Check H5Oget_info_f, only check field values
+       CALL H5Oget_info_f(group_id, oinfo_f, ierr, fields = op_data%field);
+       visit_obj_cb =  compare_h5o_info_t( oinfo_f, oinfo_c, op_data%field, .FALSE.  )
+       IF(visit_obj_cb.EQ.-1) RETURN
+
+       ! Check H5Oget_info_f; if partial field values where filled correctly
+       CALL H5Oget_info_f(group_id, oinfo_f, ierr);
+       visit_obj_cb =  compare_h5o_info_t( oinfo_f, oinfo_c, op_data%field, .TRUE.  )
+       IF(visit_obj_cb.EQ.-1) RETURN
+
+    ENDIF
 
     ! Advance to next location in expected output
     op_data%idx = op_data%idx + 1
@@ -110,7 +345,6 @@ CONTAINS
 
 END MODULE visit_cb
 
-
 MODULE TH5O_F03
 
 CONTAINS
@@ -310,29 +544,110 @@ SUBROUTINE obj_visit(total_error)
   udata%info(9)%type_obj = H5O_TYPE_NAMED_DATATYPE_F
 
   ! Visit all the objects reachable from the root group (with file ID)
-  udata%idx = 1
 
   fun_ptr = C_FUNLOC(visit_obj_cb)
   f_ptr = C_LOC(udata)
 
   ! Test h5ovisit_f
+  udata%field = H5O_INFO_ALL_F
+  udata%idx = 1
   CALL h5ovisit_f(fid, H5_INDEX_NAME_F, H5_ITER_INC_F, fun_ptr, f_ptr, ret_val, error)
   CALL check("h5ovisit_f", error, total_error)
   IF(ret_val.LT.0)THEN
      CALL check("h5ovisit_f", -1, total_error)
   ENDIF
 
-  ! Test h5ovisit_by_name_f
+  ! Test fields option
+  udata%field = H5O_INFO_ALL_F
+  udata%idx = 1
+  CALL h5ovisit_f(fid, H5_INDEX_NAME_F, H5_ITER_INC_F, fun_ptr, f_ptr, ret_val, error, fields=udata%field)
+  CALL check("h5ovisit_f", error, total_error)
+  IF(ret_val.LT.0)THEN
+     CALL check("h5ovisit_f", -1, total_error)
+  ENDIF
+  udata%field = H5O_INFO_BASIC_F
+  udata%idx = 1
+  CALL h5ovisit_f(fid, H5_INDEX_NAME_F, H5_ITER_INC_F, fun_ptr, f_ptr, ret_val, error, fields=udata%field)
+  CALL check("h5ovisit_f", error, total_error)
+  IF(ret_val.LT.0)THEN
+     CALL check("h5ovisit_f", -1, total_error)
+  ENDIF
+  udata%field = H5O_INFO_TIME_F
+  udata%idx = 1
+  CALL h5ovisit_f(fid, H5_INDEX_NAME_F, H5_ITER_INC_F, fun_ptr, f_ptr, ret_val, error, fields=udata%field)
+  CALL check("h5ovisit_f", error, total_error)
+  IF(ret_val.LT.0)THEN
+     CALL check("h5ovisit_f", -1, total_error)
+  ENDIF
+  udata%field = H5O_INFO_NUM_ATTRS_F
+  udata%idx = 1
+  CALL h5ovisit_f(fid, H5_INDEX_NAME_F, H5_ITER_INC_F, fun_ptr, f_ptr, ret_val, error, fields=udata%field)
+  CALL check("h5ovisit_f", error, total_error)
+  IF(ret_val.LT.0)THEN
+     CALL check("h5ovisit_f", -1, total_error)
+  ENDIF
+  udata%field = H5O_INFO_HDR_F
+  udata%idx = 1
+  CALL h5ovisit_f(fid, H5_INDEX_NAME_F, H5_ITER_INC_F, fun_ptr, f_ptr, ret_val, error, fields=udata%field)
+  CALL check("h5ovisit_f", error, total_error)
+  IF(ret_val.LT.0)THEN
+     CALL check("h5ovisit_f", -1, total_error)
+  ENDIF
+  udata%field = H5O_INFO_META_SIZE_F
+  udata%idx = 1
+  CALL h5ovisit_f(fid, H5_INDEX_NAME_F, H5_ITER_INC_F, fun_ptr, f_ptr, ret_val, error, fields=udata%field)
+  CALL check("h5ovisit_f", error, total_error)
+  IF(ret_val.LT.0)THEN
+     CALL check("h5ovisit_f", -1, total_error)
+  ENDIF
 
+  ! Test h5ovisit_by_name_f
   object_name = "/"
   udata%idx = 1
-
-  CALL h5ovisit_by_name_f(fid, object_name, H5_INDEX_NAME_F, H5_ITER_INC_F, fun_ptr, f_ptr, ret_val, error)
+  udata%field = H5O_INFO_ALL_F
+  CALL h5ovisit_by_name_f(fid, object_name, H5_INDEX_NAME_F, H5_ITER_INC_F, fun_ptr, f_ptr, ret_val, error, fields=udata%field)
   CALL check("h5ovisit_by_name_f", error, total_error)
   IF(ret_val.LT.0)THEN
      CALL check("h5ovisit_by_name_f", -1, total_error)
   ENDIF
 
+  ! Test fields option
+  udata%idx = 1
+  udata%field = H5O_INFO_BASIC_F
+  CALL h5ovisit_by_name_f(fid, object_name, H5_INDEX_NAME_F, H5_ITER_INC_F, fun_ptr, f_ptr, ret_val, error, fields=udata%field)
+  CALL check("h5ovisit_by_name_f", error, total_error)
+  IF(ret_val.LT.0)THEN
+     CALL check("h5ovisit_by_name_f", -1, total_error)
+  ENDIF
+  udata%idx = 1
+  udata%field = H5O_INFO_TIME_F
+  CALL h5ovisit_by_name_f(fid, object_name, H5_INDEX_NAME_F, H5_ITER_INC_F, fun_ptr, f_ptr, ret_val, error, fields=udata%field)
+  CALL check("h5ovisit_by_name_f", error, total_error)
+  IF(ret_val.LT.0)THEN
+     CALL check("h5ovisit_by_name_f", -1, total_error)
+  ENDIF
+  udata%idx = 1
+  udata%field =  H5O_INFO_NUM_ATTRS_F
+  CALL h5ovisit_by_name_f(fid, object_name, H5_INDEX_NAME_F, H5_ITER_INC_F, fun_ptr, f_ptr, ret_val, error, fields=udata%field)
+  CALL check("h5ovisit_by_name_f", error, total_error)
+  IF(ret_val.LT.0)THEN
+     CALL check("h5ovisit_by_name_f", -1, total_error)
+  ENDIF
+  udata%idx = 1
+  udata%field = H5O_INFO_HDR_F
+  CALL h5ovisit_by_name_f(fid, object_name, H5_INDEX_NAME_F, H5_ITER_INC_F, fun_ptr, f_ptr, ret_val, error, fields=udata%field)
+  CALL check("h5ovisit_by_name_f", error, total_error)
+  IF(ret_val.LT.0)THEN
+     CALL check("h5ovisit_by_name_f", -1, total_error)
+  ENDIF
+  udata%idx = 1
+  udata%field = H5O_INFO_META_SIZE_F
+  CALL h5ovisit_by_name_f(fid, object_name, H5_INDEX_NAME_F, H5_ITER_INC_F, fun_ptr, f_ptr, ret_val, error, fields=udata%field)
+  CALL check("h5ovisit_by_name_f", error, total_error)
+  IF(ret_val.LT.0)THEN
+     CALL check("h5ovisit_by_name_f", -1, total_error)
+  ENDIF
+  
   CALL h5fclose_f(fid, error)
   CALL check("h5fclose_f",error, total_error)
 
@@ -450,11 +765,32 @@ SUBROUTINE obj_info(total_error)
   IF(oinfo%rc.NE.1)THEN
      CALL check("h5oget_info_by_idx_f", -1, total_error)
   ENDIF
+  IF(oinfo%type.NE.H5O_TYPE_DATASET_F)THEN
+     CALL check("h5oget_info_by_idx_f", -1, total_error)
+  ENDIF
 
+  ! Check partial fields
+  CALL h5oget_info_by_idx_f(gid, ".", H5_INDEX_NAME_F, H5_ITER_INC_F, 0_hsize_t, oinfo, error, fields=H5O_INFO_BASIC_F )
+  CALL check("h5oget_info_by_idx_f", error, total_error)
+
+  IF(oinfo%rc.NE.1)THEN
+     CALL check("h5oget_info_by_idx_f", -1, total_error)
+  ENDIF
   IF(oinfo%type.NE.H5O_TYPE_DATASET_F)THEN
      CALL check("h5oget_info_by_idx_f", -1, total_error)
   ENDIF
 
+  CALL h5oget_info_by_idx_f(gid, ".", H5_INDEX_NAME_F, H5_ITER_INC_F, 0_hsize_t, oinfo, error, fields=H5O_INFO_TIME_F )
+  CALL check("h5oget_info_by_idx_f", error, total_error)
+  ! These field values should not be filled
+  IF(oinfo%rc.EQ.1)THEN
+     CALL check("h5oget_info_by_idx_f", -1, total_error)
+  ENDIF
+  IF(oinfo%type.EQ.H5O_TYPE_DATASET_F)THEN
+     CALL check("h5oget_info_by_idx_f", -1, total_error)
+  ENDIF
+
+
   ! Close objects
   CALL h5dclose_f(did, error)
   CALL check("h5dclose_f", error, total_error)
@@ -483,11 +819,12 @@ SUBROUTINE build_visit_file(fid)
   USE TH5_MISC
   IMPLICIT NONE
 
-  INTEGER(hid_t) :: fid                  ! File ID 
-  INTEGER(hid_t) :: gid = -1, gid2 = -1     ! Group IDs
+  INTEGER(hid_t) :: fid                   ! File ID 
+  INTEGER(hid_t) :: gid = -1, gid2 = -1   ! Group IDs
   INTEGER(hid_t) :: sid = -1              ! Dataspace ID
   INTEGER(hid_t) :: did = -1              ! Dataset ID
   INTEGER(hid_t) :: tid = -1              ! Datatype ID
+  INTEGER(hid_t) :: aid = -1, aid2 = -1, aid3 = -1 ! Attribute ID
   CHARACTER(LEN=20) :: filename = 'visit.h5'
   INTEGER :: error
   
@@ -500,6 +837,15 @@ SUBROUTINE build_visit_file(fid)
   ! Create nested group
   CALL H5Gcreate_f(gid, "Group2", gid2, error)
 
+  CALL H5Screate_f(H5S_SCALAR_F, sid, error)
+  CALL H5Acreate_f(gid2, "Attr1", H5T_NATIVE_INTEGER, sid, aid, error)
+  CALL H5Acreate_f(gid2, "Attr2", H5T_NATIVE_INTEGER, sid, aid2, error)
+  CALL H5Acreate_f(gid2, "Attr3", H5T_NATIVE_INTEGER, sid, aid3, error)
+  CALL H5Aclose_f(aid,error)
+  CALL H5Aclose_f(aid2,error)
+  CALL H5Aclose_f(aid3,error)
+  CALL H5Sclose_f(sid,error)
+
   ! Close groups
   CALL h5gclose_f(gid2, error)
   CALL h5gclose_f(gid, error)
diff --git a/fortran/test/tH5P.F90 b/fortran/test/tH5P.F90
index 563926b..c42dd7e 100644
--- a/fortran/test/tH5P.F90
+++ b/fortran/test/tH5P.F90
@@ -444,6 +444,7 @@ SUBROUTINE test_chunk_cache(cleanup, total_error)
   INTEGER(size_t) rdcc_nelmts
   INTEGER(size_t) rdcc_nbytes
   REAL :: rdcc_w0
+  LOGICAL :: minimize              ! Flag for minimized headers
 
   CALL h5_fixname_f(filename, fix_filename, H5P_DEFAULT_F, error)
   IF (error .NE. 0) THEN
@@ -648,6 +649,57 @@ SUBROUTINE test_chunk_cache(cleanup, total_error)
   CALL verify("H5Pget_chunk_cache_f", INT(nbytes_2), INT(nbytes_4), total_error)
   CALL verify("H5Pget_chunk_cache_f", w0_3, w0_4, total_error)
 
+  ! Check that the dataset object header minimization hint
+  ! can be set and retrieved.
+
+  ! H5P version
+  ! Check the default value
+  minimize = .TRUE.
+  CALL h5pget_dset_no_attrs_hint_f(dcpl, minimize, error)
+  CALL check("h5pget_dset_no_attrs_hint_f",error,total_error)
+  if(minimize .neqv. .FALSE.) then
+    total_error = total_error + 1
+    write(*,*) "Default dataset minimize flag was incorrect (H5P)"
+  endif
+
+  ! Check setter
+  minimize = .TRUE.
+  CALL h5pset_dset_no_attrs_hint_f(dcpl, minimize, error)
+  CALL check("h5pset_dset_no_attrs_hint_f",error,total_error)
+
+  ! Check getter
+  minimize = .FALSE.
+  CALL h5pget_dset_no_attrs_hint_f(dcpl, minimize, error)
+  CALL check("h5pget_dset_no_attrs_hint_f",error,total_error)
+  if(minimize .neqv. .TRUE.) then
+    total_error = total_error + 1
+    write(*,*) "Unable to get correct dataset minimize flag (H5P)"
+  endif
+
+  ! H5F version
+  ! Check the default value
+  minimize = .TRUE.
+  CALL h5fget_dset_no_attrs_hint_f(fid, minimize, error)
+  CALL check("h5fget_dset_no_attrs_hint_f",error,total_error)
+  if(minimize .neqv. .FALSE.) then
+    total_error = total_error + 1
+    write(*,*) "Default dataset minimize flag was incorrect (H5F)"
+  endif
+
+  ! Check setter
+  minimize = .TRUE.
+  CALL h5fset_dset_no_attrs_hint_f(fid, minimize, error)
+  CALL check("h5fset_dset_no_attrs_hint_f",error,total_error)
+
+  ! Check getter
+  minimize = .FALSE.
+  CALL h5fget_dset_no_attrs_hint_f(fid, minimize, error)
+  CALL check("h5fget_dset_no_attrs_hint_f",error,total_error)
+  if(minimize .neqv. .TRUE.) then
+    total_error = total_error + 1
+    write(*,*) "Unable to get correct dataset minimize flag (H5F)"
+  endif
+
 ! Close
 
   CALL H5Dclose_f(dsid, error)
diff --git a/hl/fortran/src/Makefile.am b/hl/fortran/src/Makefile.am
index a495e220..37e074c 100644
--- a/hl/fortran/src/Makefile.am
+++ b/hl/fortran/src/Makefile.am
@@ -50,6 +50,21 @@ libhdf5hl_fortran_la_SOURCES=H5DSfc.c H5LTfc.c H5IMfc.c H5IMcc.c H5TBfc.c \
 # HDF5 HL Fortran library depends on HDF5 Library.
 libhdf5hl_fortran_la_LIBADD=$(LIBH5_HL) $(LIBH5F)
 
+# The name of the lib file doesn't follow the same pattern as the other hl lib
+# files, namely libhdf5_hl_*.  Add a symlink with the compliant name to the
+# actual lib file.
+install-exec-hook:
+	cd $(DESTDIR)$(libdir) && \
+	    if test -f libhdf5hl_fortran.a -a \
+	    ! -f libhdf5_hl_fortran.a; then \
+	        $(LN_S) libhdf5hl_fortran.a libhdf5_hl_fortran.a; \
+	    fi; \
+	    if test -f libhdf5hl_fortran.so -a \
+	    ! -f libhdf5_hl_fortran.so; then \
+	        $(LN_S) libhdf5hl_fortran.so libhdf5_hl_fortran.so; \
+	    fi;
+
+
 # Fortran module files can have different extensions and different names
 # (e.g., different capitalizations) on different platforms.  Write rules
 # for them explicitly rather than trying to teach automake about them.
@@ -72,6 +87,7 @@ uninstall-local:
 	    set -x; $(RM) $(includedir)/*.$(F9XMODEXT);                 \
 	  fi;                                                           \
 	fi
+	$(RM) $(DESTDIR)$(libdir)/libhdf5_hl_fortran*
 
 # These are the helper programs we need to build.
 noinst_PROGRAMS = H5HL_buildiface
diff --git a/hl/tools/h5watch/CMakeTests.cmake b/hl/tools/h5watch/CMakeTests.cmake
index 0b7b4d4..13d5e47 100644
--- a/hl/tools/h5watch/CMakeTests.cmake
+++ b/hl/tools/h5watch/CMakeTests.cmake
@@ -18,16 +18,16 @@
 
 set (H5WATCH_TEST_FILES
     w-help1.ddl
-    w-err-cmpd1.ddl
-    w-err-cmpd2.ddl
-    w-err-cmpd3.ddl
-    w-err-cmpd4.ddl
-    w-err-cmpd5.ddl
-    w-err-dset1.ddl
-    w-err-dset2.ddl
-    w-err-dset-nomax.ddl
-    w-err-dset-none.ddl
-    w-err-file.ddl
+    w-err-cmpd1.err
+    w-err-cmpd2.err
+    w-err-cmpd3.err
+    w-err-cmpd4.err
+    w-err-cmpd5.err
+    w-err-dset1.err
+    w-err-dset2.err
+    w-err-dset-nomax.err
+    w-err-dset-none.err
+    w-err-file.err
     w-err-poll.ddl
     w-err-poll0.ddl
     w-err-width.ddl
@@ -86,6 +86,25 @@ add_custom_target(H5WATCH_files ALL COMMENT "Copying files needed by H5WATCH tes
     endif ()
   endmacro ()
 
+  macro (ADD_H5_ERR_TEST resultfile resultcode)
+    if (NOT HDF5_ENABLE_USING_MEMCHECKER)
+      add_test (
+          NAME H5WATCH_ARGS-h5watch-${resultfile}
+          COMMAND "${CMAKE_COMMAND}"
+              -D "TEST_PROGRAM=$<TARGET_FILE:h5watch>"
+              -D "TEST_ARGS:STRING=${ARGN}"
+              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/testfiles"
+              -D "TEST_OUTPUT=${resultfile}.out"
+              -D "TEST_EXPECT=${resultcode}"
+              -D "TEST_REFERENCE=${resultfile}.mty"
+              -D "TEST_ERRREF=${resultfile}.err"
+              -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
+      )
+      set_tests_properties (H5WATCH_ARGS-h5watch-${resultfile} PROPERTIES DEPENDS ${last_test})
+      set (last_test "H5WATCH_ARGS-h5watch-${resultfile}")
+    endif ()
+  endmacro ()
+
   macro (ADD_H5_WATCH resultfile resultcode)
     if (NOT HDF5_ENABLE_USING_MEMCHECKER)
       add_test (
@@ -162,20 +181,20 @@ if (NOT SWMR_INCOMPAT)
   ADD_H5_TEST (w-help1 0 --help)
 #
 # Tests on expected failures
-  ADD_H5_TEST (w-err-dset1 1 WATCH.h5)
-  ADD_H5_TEST (w-err-dset2 1 WATCH.h5/group/DSET_CMPD)
-  ADD_H5_TEST (w-err-dset-none 1 WATCH.h5/DSET_NONE)
-  ADD_H5_TEST (w-err-dset-nomax 1 WATCH.h5/DSET_NOMAX)
-  ADD_H5_TEST (w-err-file 1 ../WATCH.h5/DSET_CMPD)
+  ADD_H5_ERR_TEST (w-err-dset1 1 WATCH.h5)
+  ADD_H5_ERR_TEST (w-err-dset2 1 WATCH.h5/group/DSET_CMPD)
+  ADD_H5_ERR_TEST (w-err-dset-none 1 WATCH.h5/DSET_NONE)
+  ADD_H5_ERR_TEST (w-err-dset-nomax 1 WATCH.h5/DSET_NOMAX)
+  ADD_H5_ERR_TEST (w-err-file 1 ../WATCH.h5/DSET_CMPD)
   ADD_H5_TEST (w-err-width 1 --width=-8 WATCH.h5/DSET_ONE)
   ADD_H5_TEST (w-err-poll 1 --polling=-8 WATCH.h5/DSET_ONE)
   ADD_H5_TEST (w-err-poll0 1 --polling=0 WATCH.h5/DSET_ONE)
 #
 # Tests on invalid field names via --fields option for a compound typed dataset: DSET_CMPD
-  ADD_H5_TEST (w-err-cmpd1 1 --fields=fieldx WATCH.h5/DSET_CMPD)
-  ADD_H5_TEST (w-err-cmpd2 1 --fields=field1,field2. WATCH.h5/DSET_CMPD)
-  ADD_H5_TEST (w-err-cmpd3 1 --fields=field1,field2, WATCH.h5/DSET_CMPD)
-  ADD_H5_TEST (w-err-cmpd4 1 --fields=field1,field2.b.k WATCH.h5/DSET_CMPD)
-  ADD_H5_TEST (w-err-cmpd5 1 --fields=field1 --fields=field2.b.k WATCH.h5/DSET_CMPD)
+  ADD_H5_ERR_TEST (w-err-cmpd1 1 --fields=fieldx WATCH.h5/DSET_CMPD)
+  ADD_H5_ERR_TEST (w-err-cmpd2 1 --fields=field1,field2. WATCH.h5/DSET_CMPD)
+  ADD_H5_ERR_TEST (w-err-cmpd3 1 --fields=field1,field2, WATCH.h5/DSET_CMPD)
+  ADD_H5_ERR_TEST (w-err-cmpd4 1 --fields=field1,field2.b.k WATCH.h5/DSET_CMPD)
+  ADD_H5_ERR_TEST (w-err-cmpd5 1 --fields=field1 --fields=field2.b.k WATCH.h5/DSET_CMPD)
 #
 endif ()
diff --git a/hl/tools/h5watch/testh5watch.sh.in b/hl/tools/h5watch/testh5watch.sh.in
index 3f8f5ae..d31bcc3 100644
--- a/hl/tools/h5watch/testh5watch.sh.in
+++ b/hl/tools/h5watch/testh5watch.sh.in
@@ -32,19 +32,19 @@ fi
 #echo
 #exit 0
 
-H5WATCH=h5watch               	# The tool name
-H5WATCH_BIN=`pwd`/$H5WATCH    	# The path of H5WATCH
-EXTEND_DSET=extend_dset 	# Routine to extend the dataset when watching
-EXTEND_BIN=`pwd`/$EXTEND_DSET 	# The path of EXTEND_DSET
+H5WATCH=h5watch                   # The tool name
+H5WATCH_BIN=`pwd`/$H5WATCH        # The path of H5WATCH
+EXTEND_DSET=extend_dset     # Routine to extend the dataset when watching
+EXTEND_BIN=`pwd`/$EXTEND_DSET     # The path of EXTEND_DSET
 #
 EXIT_SUCCESS=0
 EXIT_FAILURE=1
 #
-GEN_TEST=h5watchgentest	      	# Generate HDF5 file with various datasets
-GEN_TEST_BIN=`pwd`/$GEN_TEST 	# Path of the binary GEN_TEST
+GEN_TEST=h5watchgentest              # Generate HDF5 file with various datasets
+GEN_TEST_BIN=`pwd`/$GEN_TEST     # Path of the binary GEN_TEST
 WATCHFILE=`pwd`/WATCH.h5        # The HDF5 file generated to test h5watch
 TESTFILE=TEST.h5                # The temporary file (a copy of WATCH.h5) used by tests
-TRY_MAX=30                      # Try running the test again 
+TRY_MAX=30                      # Try running the test again
 #
 # These 3 defines should be the same as the defines in ./extend_dset.c
 WRITER_MESSAGE=writer_message   # The message file created by the "extend" process
@@ -53,7 +53,7 @@ MESSAGE_TIMEOUT=300             # Message timeout length in secs
 #
 CMP='cmp -s'
 DIFF='diff -c'
-NLINES=20			# Max. lines of output to display if test fails
+NLINES=20            # Max. lines of output to display if test fails
 #
 # Mac OS: just to make sure echo "backslash backslash" behaves properly
 if test `uname -s` = 'Darwin'; then
@@ -83,9 +83,9 @@ TESTING() {
 # Overall algorithm:
 #
 # Run a test and print PASSED or FAILED
-# If a test did not return with the expected return code, 
+# If a test did not return with the expected return code,
 # increment the `nerrors' global variable and (if $verbose is set) display up to $NLINES
-# lines of the actual output from the test.  
+# lines of the actual output from the test.
 # If the test did return the expected code,
 # compare the actual output with the expected output;
 # If the outputs are the same, print PASSED,
@@ -137,7 +137,54 @@ TOOLTEST() {
 
     # Clean up output file
     if test -z "$HDF5_NOCLEANUP"; then
-	rm -f $actual $actual_err
+    rm -f $actual $actual_err
+    fi
+}
+#
+# TOOLTEST_ERR():
+# same as toolset only compare error file
+#
+# Arguments:
+#
+# $1 -- expected output
+# $2 -- expected return code
+# $3 and on -- arguments for h5watch
+TOOLTEST_ERR() {
+    expect="$srcdir/../testfiles/$1"
+    expect_err="$srcdir/../testfiles/`basename $1 .ddl`.err"
+    actual="../testfiles/`basename $1 .ddl`.out"
+    actual_err="../testfiles/`basename $1 .ddl`.out.err"
+    shift
+    retvalexpect=$1
+    shift
+    # Run test.
+    TESTING $H5WATCH $@
+    (
+        $RUNSERIAL $H5WATCH_BIN "$@"
+    ) > $actual 2>$actual_err
+    exitcode=$?
+    if [ $exitcode -ne $retvalexpect ]; then
+        $ECHO "*FAILED*"
+        nerrors="`expr $nerrors + 1`"
+        if [ yes = "$verbose" ]; then
+            $ECHO "test returned with exit code $exitcode"
+            $ECHO "test output: (up to $NLINES lines)"
+            head -$NLINES $actual
+            $ECHO "***end of test output***"
+            $ECHO ""
+        fi
+        elif $CMP $expect_err $actual_err; then
+            $ECHO " PASSED"
+        else
+            $ECHO "*FAILED*"
+            $ECHO "    Expected result differs from actual result"
+            nerrors="`expr $nerrors + 1`"
+            test yes = "$verbose" && $DIFF $expect_err $actual_err |sed 's/^/    /'
+        fi
+
+    # Clean up output file
+    if test -z "$HDF5_NOCLEANUP"; then
+    rm -f $actual $actual_err
     fi
 }
 
@@ -176,15 +223,15 @@ do
     # Wait for message from "extend_dset" process to start h5watch--
     # To wait for the writer message file or till the maximum # of seconds is reached
     # This performs similar function as the routine h5_wait_message() in test/h5test.c
-    mexist=0                                    	# Indicate whether the message file is found
-    t0=`date +%s`                               	# Get current time in seconds
-    difft=0                                     	# Initialize the time difference
-    while [ $difft -lt $MESSAGE_TIMEOUT ] ;     	# Loop till message times out
+    mexist=0                                        # Indicate whether the message file is found
+    t0=`date +%s`                                   # Get current time in seconds
+    difft=0                                         # Initialize the time difference
+    while [ $difft -lt $MESSAGE_TIMEOUT ] ;         # Loop till message times out
     do
-        t1=`date +%s`                           	# Get current time in seconds
-        difft=`expr $t1 - $t0`                  	# Calculate the time difference
+        t1=`date +%s`                               # Get current time in seconds
+        difft=`expr $t1 - $t0`                      # Calculate the time difference
         if [ -e $WRITER_MESSAGE ]; then             # If message file is found:
-            mexist=1                            	#       indicate the message file is found
+            mexist=1                                #       indicate the message file is found
             rm $WRITER_MESSAGE                      #       remove the message file
             break                                   #       get out of the while loop
         fi
@@ -211,8 +258,8 @@ do
         wait $extend_pid                                # Wait for "extend" process to complete
         extend_exit=$?                                  # Collect "extend" process' exit code
         sleep 1                                         # Sleep to make sure output is flushed
-        kill $watch_pid                              	# Kill h5watch
-        wait $watch_pid					                # Wait for "h5watch" process to complete
+        kill $watch_pid                                  # Kill h5watch
+        wait $watch_pid                                    # Wait for "h5watch" process to complete
         #
         if [ $extend_exit -ne 0 ]; then                 # Error returned from "extend" process
             $ECHO "*FAILED*"
@@ -265,7 +312,7 @@ done;
 #       DSET_ONE: one-dimensional dataset                                                       #
 #       DSET_TWO: two-dimensional dataset                                                       #
 #       DSET_CMPD: one-dimensional dataset with compound type                                   #
-#       DSET_CMPD_ESC: one-dimensional dataset with compound type & escape/separator characters	#
+#       DSET_CMPD_ESC: one-dimensional dataset with compound type & escape/separator characters    #
 #       DSET_CMPD_TWO: two-dimensional dataset with compound type                               #
 #                                                                                               #
 #   The following datasets are one-dimensional, chunked, max. dimension setting:                #
@@ -282,11 +329,11 @@ done;
 #################################################################################################
 #                                                                                               #
 # Tests on expected failures:                                                                   #
-#	Invalid file name                                                                           #
-#	Unable to find dataset, invalid dataset                                                     #
-#	  DSET_NONE and DSET_NOMAX                                                                  #
-#	Invalid input to options --width and --polling                                              #
-#	Invalid field names for -f option                                                           #
+#    Invalid file name                                                                           #
+#    Unable to find dataset, invalid dataset                                                     #
+#      DSET_NONE and DSET_NOMAX                                                                  #
+#    Invalid input to options --width and --polling                                              #
+#    Invalid field names for -f option                                                           #
 #                                                                                               #
 #################################################################################################
 #
@@ -296,21 +343,21 @@ $GEN_TEST_BIN
 TOOLTEST w-help1.ddl 0 --help
 #
 # Tests on expected failures
-TOOLTEST w-err-dset1.ddl 1 WATCH.h5
-TOOLTEST w-err-dset2.ddl 1 WATCH.h5/group/DSET_CMPD
-TOOLTEST w-err-dset-none.ddl 1 WATCH.h5/DSET_NONE
-TOOLTEST w-err-dset-nomax.ddl 1 WATCH.h5/DSET_NOMAX
-TOOLTEST w-err-file.ddl 1 ../WATCH.h5/DSET_CMPD
+TOOLTEST_ERR w-err-dset1.ddl 1 WATCH.h5
+TOOLTEST_ERR w-err-dset2.ddl 1 WATCH.h5/group/DSET_CMPD
+TOOLTEST_ERR w-err-dset-none.ddl 1 WATCH.h5/DSET_NONE
+TOOLTEST_ERR w-err-dset-nomax.ddl 1 WATCH.h5/DSET_NOMAX
+TOOLTEST_ERR w-err-file.ddl 1 ../WATCH.h5/DSET_CMPD
 TOOLTEST w-err-width.ddl 1 --width=-8 WATCH.h5/DSET_ONE
 TOOLTEST w-err-poll.ddl 1 --polling=-8 WATCH.h5/DSET_ONE
 TOOLTEST w-err-poll0.ddl 1 --polling=0 WATCH.h5/DSET_ONE
 #
 # Tests on invalid field names via --fields option for a compound typed dataset: DSET_CMPD
-TOOLTEST w-err-cmpd1.ddl 1 --fields=fieldx WATCH.h5/DSET_CMPD
-TOOLTEST w-err-cmpd2.ddl 1 --fields=field1,field2. WATCH.h5/DSET_CMPD
-TOOLTEST w-err-cmpd3.ddl 1 --fields=field1,field2, WATCH.h5/DSET_CMPD
-TOOLTEST w-err-cmpd4.ddl 1 --fields=field1,field2.b.k WATCH.h5/DSET_CMPD
-TOOLTEST w-err-cmpd5.ddl 1 --fields=field1 --fields=field2.b.k WATCH.h5/DSET_CMPD
+TOOLTEST_ERR w-err-cmpd1.ddl 1 --fields=fieldx WATCH.h5/DSET_CMPD
+TOOLTEST_ERR w-err-cmpd2.ddl 1 --fields=field1,field2. WATCH.h5/DSET_CMPD
+TOOLTEST_ERR w-err-cmpd3.ddl 1 --fields=field1,field2, WATCH.h5/DSET_CMPD
+TOOLTEST_ERR w-err-cmpd4.ddl 1 --fields=field1,field2.b.k WATCH.h5/DSET_CMPD
+TOOLTEST_ERR w-err-cmpd5.ddl 1 --fields=field1 --fields=field2.b.k WATCH.h5/DSET_CMPD
 #
 echo "DONE WITH 1st SET OF TESTS"
 #
diff --git a/hl/tools/testfiles/w-err-cmpd1.ddl b/hl/tools/testfiles/w-err-cmpd1.err
index 775d6a0..9c165fb 100644
--- a/hl/tools/testfiles/w-err-cmpd1.ddl
+++ b/hl/tools/testfiles/w-err-cmpd1.err
@@ -1,2 +1 @@
-Opened "WATCH.h5" with sec2 driver.
 h5watch error: error in processing <list_of_fields>
diff --git a/hl/tools/testfiles/w-err-cmpd2.ddl b/hl/tools/testfiles/w-err-cmpd2.err
index 775d6a0..9c165fb 100644
--- a/hl/tools/testfiles/w-err-cmpd2.ddl
+++ b/hl/tools/testfiles/w-err-cmpd2.err
@@ -1,2 +1 @@
-Opened "WATCH.h5" with sec2 driver.
 h5watch error: error in processing <list_of_fields>
diff --git a/hl/tools/testfiles/w-err-cmpd3.ddl b/hl/tools/testfiles/w-err-cmpd3.err
index 775d6a0..9c165fb 100644
--- a/hl/tools/testfiles/w-err-cmpd3.ddl
+++ b/hl/tools/testfiles/w-err-cmpd3.err
@@ -1,2 +1 @@
-Opened "WATCH.h5" with sec2 driver.
 h5watch error: error in processing <list_of_fields>
diff --git a/hl/tools/testfiles/w-err-cmpd4.ddl b/hl/tools/testfiles/w-err-cmpd4.err
index 775d6a0..9c165fb 100644
--- a/hl/tools/testfiles/w-err-cmpd4.ddl
+++ b/hl/tools/testfiles/w-err-cmpd4.err
@@ -1,2 +1 @@
-Opened "WATCH.h5" with sec2 driver.
 h5watch error: error in processing <list_of_fields>
diff --git a/hl/tools/testfiles/w-err-cmpd5.err b/hl/tools/testfiles/w-err-cmpd5.err
new file mode 100644
index 0000000..9c165fb
--- /dev/null
+++ b/hl/tools/testfiles/w-err-cmpd5.err
@@ -0,0 +1 @@
+h5watch error: error in processing <list_of_fields>
diff --git a/hl/tools/testfiles/w-err-dset-nomax.ddl b/hl/tools/testfiles/w-err-dset-nomax.err
index b99cf84..fd5ca7e 100644
--- a/hl/tools/testfiles/w-err-dset-nomax.ddl
+++ b/hl/tools/testfiles/w-err-dset-nomax.err
@@ -1,2 +1 @@
-Opened "WATCH.h5" with sec2 driver.
 h5watch error: "/DSET_NOMAX" should have unlimited or max. dimension setting
diff --git a/hl/tools/testfiles/w-err-dset-none.ddl b/hl/tools/testfiles/w-err-dset-none.err
index cbf6770..db781c3 100644
--- a/hl/tools/testfiles/w-err-dset-none.ddl
+++ b/hl/tools/testfiles/w-err-dset-none.err
@@ -1,2 +1 @@
-Opened "WATCH.h5" with sec2 driver.
 h5watch error: "/DSET_NONE" should be a chunked or virtual dataset
diff --git a/hl/tools/testfiles/w-err-dset1.ddl b/hl/tools/testfiles/w-err-dset1.err
index 433c4d6..d6b2a6e 100644
--- a/hl/tools/testfiles/w-err-dset1.ddl
+++ b/hl/tools/testfiles/w-err-dset1.err
@@ -1,2 +1 @@
-Opened "WATCH.h5" with sec2 driver.
 h5watch error: no dataset specified
diff --git a/hl/tools/testfiles/w-err-dset2.ddl b/hl/tools/testfiles/w-err-dset2.err
index 81b52de..3f77ec8 100644
--- a/hl/tools/testfiles/w-err-dset2.ddl
+++ b/hl/tools/testfiles/w-err-dset2.err
@@ -1,2 +1 @@
-Opened "WATCH.h5" with sec2 driver.
 h5watch error: unable to open dataset "/group/DSET_CMPD"
diff --git a/hl/tools/testfiles/w-err-file.ddl b/hl/tools/testfiles/w-err-file.err
index 015661f..015661f 100644
--- a/hl/tools/testfiles/w-err-file.ddl
+++ b/hl/tools/testfiles/w-err-file.err
diff --git a/hl/tools/testfiles/w-err-cmpd5.ddl b/hl/tools/testfiles/w-err-std.ddl
index 775d6a0..775d6a0 100644
--- a/hl/tools/testfiles/w-err-cmpd5.ddl
+++ b/hl/tools/testfiles/w-err-std.ddl
diff --git a/java/src/hdf/hdf5lib/H5.java b/java/src/hdf/hdf5lib/H5.java
index f9f9b65..807c613 100644
--- a/java/src/hdf/hdf5lib/H5.java
+++ b/java/src/hdf/hdf5lib/H5.java
@@ -499,9 +499,9 @@ public class H5 implements java.io.Serializable {
     private synchronized static native boolean H5is_library_threadsafe();
 
     // /////// unimplemented ////////
-    // H5_DLL herr_t H5free_memory(void *mem);
-    // H5_DLL void *H5allocate_memory(size_t size, hbool_t clear);
-    // H5_DLL void *H5resize_memory(void *mem, size_t size);
+    //  herr_t H5free_memory(void *mem);
+    //  void *H5allocate_memory(size_t size, hbool_t clear);
+    //  void *H5resize_memory(void *mem, size_t size);
 
     // ////////////////////////////////////////////////////////////
     // //
@@ -852,7 +852,8 @@ public class H5 implements java.io.Serializable {
      * @exception HDF5LibraryException
      *                - Error from the HDF-5 Library.
      **/
-    public static long H5Aget_space(long attr_id) throws HDF5LibraryException {
+    public static long H5Aget_space(long attr_id) throws HDF5LibraryException
+    {
         long id = _H5Aget_space(attr_id);
         if (id > 0) {
             log.trace("OPEN_IDS: H5Aget_space add {}", id);
@@ -888,7 +889,8 @@ public class H5 implements java.io.Serializable {
      * @exception HDF5LibraryException
      *                - Error from the HDF-5 Library.
      **/
-    public static long H5Aget_type(long attr_id) throws HDF5LibraryException {
+    public static long H5Aget_type(long attr_id) throws HDF5LibraryException
+    {
         long id = _H5Aget_type(attr_id);
         if (id > 0) {
             log.trace("OPEN_IDS: H5Aget_type add {}", id);
@@ -918,8 +920,9 @@ public class H5 implements java.io.Serializable {
      * @exception NullPointerException
      *                - Name is null.
      **/
-    public static long H5Aopen(long obj_id, String attr_name, long aapl_id) throws HDF5LibraryException,
-            NullPointerException {
+    public static long H5Aopen(long obj_id, String attr_name, long aapl_id)
+            throws HDF5LibraryException, NullPointerException
+    {
         long id = _H5Aopen(obj_id, attr_name, aapl_id);
         if (id > 0) {
             log.trace("OPEN_IDS: H5Aopen add {}", id);
@@ -959,7 +962,8 @@ public class H5 implements java.io.Serializable {
      *                - Name is null.
      **/
     public static long H5Aopen_by_idx(long loc_id, String obj_name, int idx_type, int order, long n, long aapl_id,
-            long lapl_id) throws HDF5LibraryException, NullPointerException {
+            long lapl_id) throws HDF5LibraryException, NullPointerException
+    {
         long id = _H5Aopen_by_idx(loc_id, obj_name, idx_type, order, n, aapl_id, lapl_id);
         if (id > 0) {
             log.trace("OPEN_IDS: H5Aopen_by_idx add {}", id);
@@ -994,7 +998,8 @@ public class H5 implements java.io.Serializable {
      *                - obj_name is null.
      **/
     public static long H5Aopen_by_name(long loc_id, String obj_name, String attr_name, long aapl_id, long lapl_id)
-            throws HDF5LibraryException, NullPointerException {
+            throws HDF5LibraryException, NullPointerException
+    {
         long id = _H5Aopen_by_name(loc_id, obj_name, attr_name, aapl_id, lapl_id);
         if (id > 0) {
             log.trace("OPEN_IDS: H5Aopen_by_name add {}", id);
@@ -1015,8 +1020,10 @@ public class H5 implements java.io.Serializable {
      *            IN: Identifier of an attribute to read.
      * @param mem_type_id
      *            IN: Identifier of the attribute datatype (in memory).
-     * @param buf
-     *            IN: Buffer for data to be read.
+     * @param obj
+     *            Buffer to store data read from the file.
+     * @param isCriticalPinning
+     *            request lock on data reference.
      *
      * @return a non-negative value if successful
      *
@@ -1025,9 +1032,19 @@ public class H5 implements java.io.Serializable {
      * @exception NullPointerException
      *                - data buffer is null.
      **/
-    public synchronized static native int H5Aread(long attr_id, long mem_type_id, byte[] buf)
+    public synchronized static native int H5Aread(long attr_id, long mem_type_id, byte[] obj, boolean isCriticalPinning)
             throws HDF5LibraryException, NullPointerException;
 
+    public synchronized static int H5Aread(long attr_id, long mem_type_id, byte[] buf) throws HDF5LibraryException, NullPointerException
+    {
+        return H5Aread(attr_id, mem_type_id, buf, true);
+    }
+
+    public synchronized static int H5Aread(long attr_id, long mem_type_id, Object obj) throws HDF5Exception, HDF5LibraryException, NullPointerException
+    {
+        return H5Aread(attr_id, mem_type_id, obj, true);
+    }
+
     /**
      * H5Aread reads an attribute, specified with attr_id. The attribute's memory datatype is specified with
      * mem_type_id. The entire attribute is read into data object from the file.
@@ -1038,31 +1055,143 @@ public class H5 implements java.io.Serializable {
      *            IN: Identifier of the attribute datatype (in memory).
      * @param obj
      *            IN: Object for data to be read.
+     * @param isCriticalPinning
+     *            request lock on data reference.
      *
      * @return a non-negative value if successful
      *
+     * @exception HDF5Exception
+     *                - Failure in the data conversion.
      * @exception HDF5LibraryException
      *                - Error from the HDF-5 Library.
      * @exception NullPointerException
      *                - data buffer is null. See public synchronized static native int H5Aread( )
      **/
-    public synchronized static int H5Aread(long attr_id, long mem_type_id, Object obj) throws HDF5Exception,
-            NullPointerException {
-        HDFArray theArray = new HDFArray(obj);
-        byte[] buf = theArray.emptyBytes();
+    public synchronized static int H5Aread(long attr_id, long mem_type_id, Object obj, boolean isCriticalPinning)
+            throws HDF5Exception, HDF5LibraryException, NullPointerException
+    {
+        int status = -1;
+        boolean is1D = false;
+
+        Class dataClass = obj.getClass();
+        if (!dataClass.isArray()) {
+            throw (new HDF5JavaException("H5Aread: data is not an array"));
+        }
 
-        // This will raise an exception if there is an error
-        int status = H5Aread(attr_id, mem_type_id, buf);
+        String cname = dataClass.getName();
+        is1D = (cname.lastIndexOf('[') == cname.indexOf('['));
+        char dname = cname.charAt(cname.lastIndexOf("[") + 1);
+        log.trace("H5Aread: cname={} is1D={} dname={}", cname, is1D, dname);
 
-        // No exception: status really ought to be OK
-        if (status >= 0) {
-            obj = theArray.arrayify(buf);
+        if (is1D && (dname == 'B')) {
+            log.trace("H5Aread_dname_B");
+            status = H5Aread(attr_id, mem_type_id, (byte[]) obj, isCriticalPinning);
+        }
+        else if (is1D && (dname == 'S')) {
+            log.trace("H5Aread_dname_S");
+            status = H5Aread_short(attr_id, mem_type_id, (short[]) obj, isCriticalPinning);
+        }
+        else if (is1D && (dname == 'I')) {
+            log.trace("H5Aread_dname_I");
+            status = H5Aread_int(attr_id, mem_type_id, (int[]) obj, isCriticalPinning);
+        }
+        else if (is1D && (dname == 'J')) {
+            log.trace("H5Aread_dname_J");
+            status = H5Aread_long(attr_id, mem_type_id, (long[]) obj, isCriticalPinning);
+        }
+        else if (is1D && (dname == 'F')) {
+            log.trace("H5Aread_dname_F");
+            status = H5Aread_float(attr_id, mem_type_id, (float[]) obj, isCriticalPinning);
+        }
+        else if (is1D && (dname == 'D')) {
+            log.trace("H5Aread_dname_D");
+            status = H5Aread_double(attr_id, mem_type_id, (double[]) obj, isCriticalPinning);
+        }
+        else if ((H5.H5Tdetect_class(mem_type_id, HDF5Constants.H5T_REFERENCE) && (is1D && (dataClass.getComponentType() == String.class))) || H5.H5Tequal(mem_type_id, HDF5Constants.H5T_STD_REF_DSETREG)) {
+            log.trace("H5Aread_reg_ref");
+            status = H5Aread_reg_ref(attr_id, mem_type_id, (String[]) obj);
+        }
+        else if (is1D && (dataClass.getComponentType() == String.class)) {
+            log.trace("H5Aread_string type");
+            status = H5Aread_string(attr_id, mem_type_id, (String[]) obj);
+        }
+        else {
+            // Create a data buffer to hold the data into a Java Array
+            HDFArray theArray = new HDFArray(obj);
+            byte[] buf = theArray.emptyBytes();
+            log.trace("H5Aread_else");
+
+            // This will raise an exception if there is an error
+            status = H5Aread(attr_id, mem_type_id, buf, isCriticalPinning);
+
+            // No exception: status really ought to be OK
+            if (status >= 0) {
+                obj = theArray.arrayify(buf);
+            }
+
+            // clean up these: assign 'null' as hint to gc()
+            buf = null;
+            theArray = null;
         }
 
         return status;
     }
 
-    public synchronized static native int H5AreadVL(long attr_id, long mem_type_id, String[] buf)
+    public synchronized static native int H5Aread_double(long attr_id, long mem_type_id, double[] buf, boolean isCriticalPinning)
+            throws HDF5LibraryException, NullPointerException;
+
+    public synchronized static int H5Aread_double(long attr_id, long mem_type_id, double[] buf)
+            throws HDF5LibraryException, NullPointerException
+    {
+        return H5Aread_double(attr_id, mem_type_id, buf, true);
+    }
+
+    public synchronized static native int H5Aread_float(long attr_id, long mem_type_id, float[] buf, boolean isCriticalPinning)
+            throws HDF5LibraryException, NullPointerException;
+
+    public synchronized static int H5Aread_float(long attr_id, long mem_type_id, float[] buf)
+            throws HDF5LibraryException, NullPointerException
+    {
+        return H5Aread_float(attr_id, mem_type_id, buf, true);
+    }
+
+    public synchronized static native int H5Aread_int(long attr_id, long mem_type_id, int[] buf, boolean isCriticalPinning)
+            throws HDF5LibraryException, NullPointerException;
+
+    public synchronized static int H5Aread_int(long attr_id, long mem_type_id, int[] buf)
+            throws HDF5LibraryException, NullPointerException
+    {
+        return H5Aread_int(attr_id, mem_type_id, buf, true);
+    }
+
+    public synchronized static native int H5Aread_long(long attr_id, long mem_type_id, long[] buf, boolean isCriticalPinning)
+            throws HDF5LibraryException, NullPointerException;
+
+    public synchronized static int H5Aread_long(long attr_id, long mem_type_id, long[] buf)
+            throws HDF5LibraryException, NullPointerException
+    {
+        return H5Aread_long(attr_id, mem_type_id, buf, true);
+    }
+
+    public synchronized static native int H5Aread_reg_ref(long attr_id, long mem_type_id, String[] buf)
+            throws HDF5LibraryException, NullPointerException;
+
+    public synchronized static native int H5Aread_short(long attr_id, long mem_type_id, short[] buf, boolean isCriticalPinning)
+            throws HDF5LibraryException, NullPointerException;
+
+    public synchronized static int H5Aread_short(long attr_id, long mem_type_id, short[] buf)
+            throws HDF5LibraryException, NullPointerException
+    {
+        return H5Aread_short(attr_id, mem_type_id, buf, true);
+    }
+
+    public synchronized static native int H5AreadVL(long attr_id, long mem_type_id, Object[] buf)
+            throws HDF5LibraryException, NullPointerException;
+
+    public synchronized static native int H5Aread_string(long attr_id, long mem_type_id, String[] buf)
+            throws HDF5LibraryException, NullPointerException;
+
+    public synchronized static native int H5Aread_VLStrings(long attr_id, long mem_type_id, Object[] buf)
             throws HDF5LibraryException, NullPointerException;
 
     public synchronized static native int H5AreadComplex(long attr_id, long mem_type_id, String[] buf)
@@ -1123,7 +1252,9 @@ public class H5 implements java.io.Serializable {
      * @param mem_type_id
      *            IN: Identifier of the attribute datatype (in memory).
      * @param buf
-     *            IN: Data to be written.
+     *            IN: Buffer with data to be written to the file.
+     * @param isCriticalPinning
+     *            IN: request lock on data reference.
      *
      * @return a non-negative value if successful
      *
@@ -1132,9 +1263,21 @@ public class H5 implements java.io.Serializable {
      * @exception NullPointerException
      *                - data is null.
      **/
-    public synchronized static native int H5Awrite(long attr_id, long mem_type_id, byte[] buf)
+    public synchronized static native int H5Awrite(long attr_id, long mem_type_id, byte[] buf, boolean isCriticalPinning)
             throws HDF5LibraryException, NullPointerException;
 
+    public synchronized static int H5Awrite(long attr_id, long mem_type_id, byte[] buf)
+            throws HDF5LibraryException, NullPointerException
+    {
+        return H5Awrite(attr_id, mem_type_id, buf, true);
+    }
+
+    public synchronized static int H5Awrite(long attr_id, long mem_type_id, Object obj)
+            throws HDF5Exception, HDF5LibraryException, NullPointerException
+    {
+        return H5Awrite(attr_id, mem_type_id, obj, true);
+    }
+
     /**
      * H5Awrite writes an attribute, specified with attr_id. The attribute's memory datatype is specified with
      * mem_type_id. The entire attribute is written from data object to the file.
@@ -1145,28 +1288,140 @@ public class H5 implements java.io.Serializable {
      *            IN: Identifier of the attribute datatype (in memory).
      * @param obj
      *            IN: Data object to be written.
+     * @param isCriticalPinning
+     *            request lock on data reference.
      *
      * @return a non-negative value if successful
      *
+     * @exception HDF5Exception
+     *                - Failure in the data conversion.
      * @exception HDF5LibraryException
      *                - Error from the HDF-5 Library.
      * @exception NullPointerException
-     *                - data object is null. See public synchronized static native int H5Awrite(int attr_id, int
-     *                mem_type_id, byte[] buf);
+     *                - data object is null
      **/
-    public synchronized static int H5Awrite(long attr_id, long mem_type_id, Object obj)
-            throws HDF5Exception, NullPointerException
+    public synchronized static int H5Awrite(long attr_id, long mem_type_id, Object obj, boolean isCriticalPinning)
+            throws HDF5Exception, HDF5LibraryException, NullPointerException
     {
-        HDFArray theArray = new HDFArray(obj);
-        byte[] buf = theArray.byteify();
+        int status = -1;
+        boolean is1D = false;
 
-        int retVal = H5Awrite(attr_id, mem_type_id, buf);
-        buf = null;
-        theArray = null;
-        return retVal;
+        Class dataClass = obj.getClass();
+        if (!dataClass.isArray()) {
+            throw (new HDF5JavaException("H5Dwrite: data is not an array"));
+        }
+
+        String cname = dataClass.getName();
+        is1D = (cname.lastIndexOf('[') == cname.indexOf('['));
+        char dname = cname.charAt(cname.lastIndexOf("[") + 1);
+
+        if (is1D && (dname == 'B')) {
+            status = H5Awrite(attr_id, mem_type_id, (byte[]) obj, isCriticalPinning);
+        }
+        else if (is1D && (dname == 'S')) {
+            status = H5Awrite_short(attr_id, mem_type_id, (short[]) obj, isCriticalPinning);
+        }
+        else if (is1D && (dname == 'I')) {
+            status = H5Awrite_int(attr_id, mem_type_id, (int[]) obj, isCriticalPinning);
+        }
+        else if (is1D && (dname == 'J')) {
+            status = H5Awrite_long(attr_id, mem_type_id, (long[]) obj, isCriticalPinning);
+        }
+        else if (is1D && (dname == 'F')) {
+            status = H5Awrite_float(attr_id, mem_type_id, (float[]) obj, isCriticalPinning);
+        }
+        else if (is1D && (dname == 'D')) {
+            status = H5Awrite_double(attr_id, mem_type_id, (double[]) obj, isCriticalPinning);
+        }
+        else if (is1D && (dataClass.getComponentType() == String.class)) {
+            log.trace("H5Dwrite_string type");
+            status = H5Awrite_string(attr_id, mem_type_id, (String[]) obj);
+        }
+        else {
+            HDFArray theArray = new HDFArray(obj);
+            byte[] buf = theArray.byteify();
+
+            status = H5Awrite(attr_id, mem_type_id, buf);
+            buf = null;
+            theArray = null;
+        }
+
+        return status;
+    }
+
+    public synchronized static native int H5Awrite_double(long attr_id, long mem_type_id, double[] buf, boolean isCriticalPinning)
+            throws HDF5LibraryException, NullPointerException;
+
+    public synchronized static int H5Awrite_double(long attr_id, long mem_type_id, double[] buf)
+            throws HDF5LibraryException, NullPointerException
+    {
+        return H5Awrite_double(attr_id, mem_type_id, buf, true);
+    }
+
+    public synchronized static native int H5Awrite_float(long attr_id, long mem_type_id, float[] buf, boolean isCriticalPinning)
+            throws HDF5LibraryException, NullPointerException;
+
+    public synchronized static int H5Awrite_float(long attr_id, long mem_type_id, float[] buf)
+            throws HDF5LibraryException, NullPointerException
+    {
+        return H5Awrite_float(attr_id, mem_type_id, buf, true);
     }
 
-    public synchronized static native int H5AwriteVL(long attr_id, long mem_type_id, String[] buf)
+    public synchronized static native int H5Awrite_int(long attr_id, long mem_type_id, int[] buf, boolean isCriticalPinning)
+            throws HDF5LibraryException, NullPointerException;
+
+    public synchronized static int H5Awrite_int(long attr_id, long mem_type_id, int[] buf)
+            throws HDF5LibraryException, NullPointerException
+    {
+        return H5Awrite_int(attr_id, mem_type_id, buf, true);
+    }
+
+    public synchronized static native int H5Awrite_long(long attr_id, long mem_type_id, long[] buf, boolean isCriticalPinning)
+            throws HDF5LibraryException, NullPointerException;
+
+    public synchronized static int H5Awrite_long(long attr_id, long mem_type_id, long[] buf)
+            throws HDF5LibraryException, NullPointerException
+    {
+        return H5Awrite_long(attr_id, mem_type_id, buf, true);
+    }
+
+    public synchronized static native int H5Awrite_short(long attr_id, long mem_type_id, short[] buf, boolean isCriticalPinning)
+            throws HDF5LibraryException, NullPointerException;
+
+    public synchronized static int H5Awrite_short(long attr_id, long mem_type_id, short[] buf)
+            throws HDF5LibraryException, NullPointerException
+    {
+        return H5Awrite_short(attr_id, mem_type_id, buf, true);
+    }
+
+    public synchronized static native int H5Awrite_string(long attr_id, long mem_type_id, String[] buf)
+            throws HDF5LibraryException, NullPointerException;
+
+    public synchronized static native int H5AwriteVL(long attr_id, long mem_type_id, Object[] buf)
+            throws HDF5LibraryException, NullPointerException;
+
+    /**
+     * H5Awrite_VLStrings writes a variable length String dataset, specified by its identifier attr_id, from
+     * the application memory buffer buf into the file.
+     *
+     * ---- contributed by Rosetta Biosoftware
+     *
+     * @param attr_id
+     *            Identifier of the attribute read from.
+     * @param mem_type_id
+     *            Identifier of the memory datatype.
+     * @param buf
+     *            Buffer with data to be written to the file.
+     *
+     * @return a non-negative value if successful
+     *
+     * @exception HDF5LibraryException
+     *                - Error from the HDF-5 Library.
+     * @exception NullPointerException
+     *                - name is null.
+     **/
+
+    public synchronized static native int H5Awrite_VLStrings(long attr_id, long mem_type_id, Object[] buf)
             throws HDF5LibraryException, NullPointerException;
 
     /**
@@ -1614,8 +1869,8 @@ public class H5 implements java.io.Serializable {
      * @exception NullPointerException
      *                - name is null.
      **/
-    public static long H5Dopen(long loc_id, String name, long dapl_id) throws HDF5LibraryException,
-    NullPointerException {
+    public static long H5Dopen(long loc_id, String name, long dapl_id) throws HDF5LibraryException,  NullPointerException
+    {
         long id = _H5Dopen2(loc_id, name, dapl_id);
         if (id > 0) {
             log.trace("OPEN_IDS: H5Dopen add {}", id);
@@ -1664,12 +1919,14 @@ public class H5 implements java.io.Serializable {
             NullPointerException;
 
     public synchronized static int H5Dread(long dataset_id, long mem_type_id, long mem_space_id, long file_space_id,
-            long xfer_plist_id, byte[] buf) throws HDF5LibraryException, NullPointerException {
+            long xfer_plist_id, byte[] buf) throws HDF5LibraryException, NullPointerException
+    {
         return H5Dread(dataset_id, mem_type_id, mem_space_id, file_space_id, xfer_plist_id, buf, true);
     }
 
     public synchronized static int H5Dread(long dataset_id, long mem_type_id, long mem_space_id, long file_space_id,
-            long xfer_plist_id, Object obj) throws HDF5Exception, HDF5LibraryException, NullPointerException {
+            long xfer_plist_id, Object obj) throws HDF5Exception, HDF5LibraryException, NullPointerException
+    {
         return H5Dread(dataset_id, mem_type_id, mem_space_id, file_space_id, xfer_plist_id, obj, true);
     }
 
@@ -1703,7 +1960,8 @@ public class H5 implements java.io.Serializable {
      **/
     public synchronized static int H5Dread(long dataset_id, long mem_type_id, long mem_space_id, long file_space_id,
             long xfer_plist_id, Object obj, boolean isCriticalPinning) throws HDF5Exception, HDF5LibraryException,
-            NullPointerException {
+            NullPointerException
+    {
         int status = -1;
         boolean is1D = false;
 
@@ -1734,7 +1992,8 @@ public class H5 implements java.io.Serializable {
         }
         else if (is1D && (dname == 'J')) {
             log.trace("H5Dread_dname_J");
-            status = H5Dread_long(dataset_id, mem_type_id, mem_space_id, file_space_id, xfer_plist_id, (long[]) obj);
+            status = H5Dread_long(dataset_id, mem_type_id, mem_space_id, file_space_id, xfer_plist_id, (long[]) obj,
+                    isCriticalPinning);
         }
         else if (is1D && (dname == 'F')) {
             log.trace("H5Dread_dname_F");
@@ -1783,7 +2042,8 @@ public class H5 implements java.io.Serializable {
                     throws HDF5LibraryException, NullPointerException;
 
     public synchronized static int H5Dread_double(long dataset_id, long mem_type_id, long mem_space_id,
-            long file_space_id, long xfer_plist_id, double[] buf) throws HDF5LibraryException, NullPointerException {
+            long file_space_id, long xfer_plist_id, double[] buf) throws HDF5LibraryException, NullPointerException
+    {
         return H5Dread_double(dataset_id, mem_type_id, mem_space_id, file_space_id, xfer_plist_id, buf, true);
     }
 
@@ -1792,7 +2052,8 @@ public class H5 implements java.io.Serializable {
                     throws HDF5LibraryException, NullPointerException;
 
     public synchronized static int H5Dread_float(long dataset_id, long mem_type_id, long mem_space_id,
-            long file_space_id, long xfer_plist_id, float[] buf) throws HDF5LibraryException, NullPointerException {
+            long file_space_id, long xfer_plist_id, float[] buf) throws HDF5LibraryException, NullPointerException
+    {
         return H5Dread_float(dataset_id, mem_type_id, mem_space_id, file_space_id, xfer_plist_id, buf, true);
     }
 
@@ -1801,7 +2062,8 @@ public class H5 implements java.io.Serializable {
             NullPointerException;
 
     public synchronized static int H5Dread_int(long dataset_id, long mem_type_id, long mem_space_id,
-            long file_space_id, long xfer_plist_id, int[] buf) throws HDF5LibraryException, NullPointerException {
+            long file_space_id, long xfer_plist_id, int[] buf) throws HDF5LibraryException, NullPointerException
+    {
         return H5Dread_int(dataset_id, mem_type_id, mem_space_id, file_space_id, xfer_plist_id, buf, true);
     }
 
@@ -1810,22 +2072,21 @@ public class H5 implements java.io.Serializable {
             NullPointerException;
 
     public synchronized static int H5Dread_long(long dataset_id, long mem_type_id, long mem_space_id,
-            long file_space_id, long xfer_plist_id, long[] buf) throws HDF5LibraryException, NullPointerException {
+            long file_space_id, long xfer_plist_id, long[] buf) throws HDF5LibraryException, NullPointerException
+    {
         return H5Dread_long(dataset_id, mem_type_id, mem_space_id, file_space_id, xfer_plist_id, buf, true);
     }
 
     public synchronized static native int H5Dread_reg_ref(long dataset_id, long mem_type_id, long mem_space_id,
             long file_space_id, long xfer_plist_id, String[] buf) throws HDF5LibraryException, NullPointerException;
 
-    public synchronized static native int H5Dread_reg_ref_data(long dataset_id, long mem_type_id, long mem_space_id,
-            long file_space_id, long xfer_plist_id, String[] buf) throws HDF5LibraryException, NullPointerException;
-
     public synchronized static native int H5Dread_short(long dataset_id, long mem_type_id, long mem_space_id,
             long file_space_id, long xfer_plist_id, short[] buf, boolean isCriticalPinning)
                     throws HDF5LibraryException, NullPointerException;
 
     public synchronized static int H5Dread_short(long dataset_id, long mem_type_id, long mem_space_id,
-            long file_space_id, long xfer_plist_id, short[] buf) throws HDF5LibraryException, NullPointerException {
+            long file_space_id, long xfer_plist_id, short[] buf) throws HDF5LibraryException, NullPointerException
+    {
         return H5Dread_short(dataset_id, mem_type_id, mem_space_id, file_space_id, xfer_plist_id, buf, true);
     }
 
@@ -1929,12 +2190,14 @@ public class H5 implements java.io.Serializable {
             NullPointerException;
 
     public synchronized static int H5Dwrite(long dataset_id, long mem_type_id, long mem_space_id, long file_space_id,
-            long xfer_plist_id, byte[] buf) throws HDF5LibraryException, NullPointerException {
+            long xfer_plist_id, byte[] buf) throws HDF5LibraryException, NullPointerException
+    {
         return H5Dwrite(dataset_id, mem_type_id, mem_space_id, file_space_id, xfer_plist_id, buf, true);
     }
 
     public synchronized static int H5Dwrite(long dataset_id, long mem_type_id, long mem_space_id, long file_space_id,
-            long xfer_plist_id, Object obj) throws HDF5Exception, HDF5LibraryException, NullPointerException {
+            long xfer_plist_id, Object obj) throws HDF5Exception, HDF5LibraryException, NullPointerException
+    {
         return H5Dwrite(dataset_id, mem_type_id, mem_space_id, file_space_id, xfer_plist_id, obj, true);
     }
 
@@ -1968,7 +2231,8 @@ public class H5 implements java.io.Serializable {
      **/
     public synchronized static int H5Dwrite(long dataset_id, long mem_type_id, long mem_space_id, long file_space_id,
             long xfer_plist_id, Object obj, boolean isCriticalPinning) throws HDF5Exception, HDF5LibraryException,
-            NullPointerException {
+            NullPointerException
+    {
         int status = -1;
         boolean is1D = false;
 
@@ -2031,7 +2295,8 @@ public class H5 implements java.io.Serializable {
                     throws HDF5LibraryException, NullPointerException;
 
     public synchronized static int H5Dwrite_double(long dataset_id, long mem_type_id, long mem_space_id,
-            long file_space_id, long xfer_plist_id, double[] buf) throws HDF5LibraryException, NullPointerException {
+            long file_space_id, long xfer_plist_id, double[] buf) throws HDF5LibraryException, NullPointerException
+    {
         return H5Dwrite_double(dataset_id, mem_type_id, mem_space_id, file_space_id, xfer_plist_id, buf, true);
     }
 
@@ -2040,7 +2305,8 @@ public class H5 implements java.io.Serializable {
                     throws HDF5LibraryException, NullPointerException;
 
     public synchronized static int H5Dwrite_float(long dataset_id, long mem_type_id, long mem_space_id,
-            long file_space_id, long xfer_plist_id, float[] buf) throws HDF5LibraryException, NullPointerException {
+            long file_space_id, long xfer_plist_id, float[] buf) throws HDF5LibraryException, NullPointerException
+    {
         return H5Dwrite_float(dataset_id, mem_type_id, mem_space_id, file_space_id, xfer_plist_id, buf, true);
     }
 
@@ -2049,7 +2315,8 @@ public class H5 implements java.io.Serializable {
             NullPointerException;
 
     public synchronized static int H5Dwrite_int(long dataset_id, long mem_type_id, long mem_space_id,
-            long file_space_id, long xfer_plist_id, int[] buf) throws HDF5LibraryException, NullPointerException {
+            long file_space_id, long xfer_plist_id, int[] buf) throws HDF5LibraryException, NullPointerException
+    {
         return H5Dwrite_int(dataset_id, mem_type_id, mem_space_id, file_space_id, xfer_plist_id, buf, true);
     }
 
@@ -2058,7 +2325,8 @@ public class H5 implements java.io.Serializable {
             NullPointerException;
 
     public synchronized static int H5Dwrite_long(long dataset_id, long mem_type_id, long mem_space_id,
-            long file_space_id, long xfer_plist_id, long[] buf) throws HDF5LibraryException, NullPointerException {
+            long file_space_id, long xfer_plist_id, long[] buf) throws HDF5LibraryException, NullPointerException
+    {
         return H5Dwrite_long(dataset_id, mem_type_id, mem_space_id, file_space_id, xfer_plist_id, buf, true);
     }
 
@@ -2067,7 +2335,8 @@ public class H5 implements java.io.Serializable {
                     throws HDF5LibraryException, NullPointerException;
 
     public synchronized static int H5Dwrite_short(long dataset_id, long mem_type_id, long mem_space_id,
-            long file_space_id, long xfer_plist_id, short[] buf) throws HDF5LibraryException, NullPointerException {
+            long file_space_id, long xfer_plist_id, short[] buf) throws HDF5LibraryException, NullPointerException
+    {
         return H5Dwrite_short(dataset_id, mem_type_id, mem_space_id, file_space_id, xfer_plist_id, buf, true);
     }
 
@@ -2133,10 +2402,10 @@ public class H5 implements java.io.Serializable {
     public synchronized static native void H5Drefresh(long dset_id) throws HDF5LibraryException;
 
     // /////// unimplemented ////////
-    // H5_DLL herr_t H5Ddebug(hid_t dset_id);
-    // H5_DLL herr_t H5Dget_chunk_storage_size(hid_t dset_id, const hsize_t *offset, hsize_t *chunk_bytes);
-    // H5_DLL herr_t H5Dformat_convert(hid_t dset_id);
-    // H5_DLL herr_t H5Dget_chunk_index_type(hid_t did, H5D_chunk_index_t *idx_type);
+    //  herr_t H5Ddebug(hid_t dset_id);
+    //  herr_t H5Dget_chunk_storage_size(hid_t dset_id, const hsize_t *offset, hsize_t *chunk_bytes);
+    //  herr_t H5Dformat_convert(hid_t dset_id);
+    //  herr_t H5Dget_chunk_index_type(hid_t did, H5D_chunk_index_t *idx_type);
 
     // herr_t H5Dgather(hid_t src_space_id, const void *src_buf, hid_t type_id,
     //                  size_t dst_buf_size, void *dst_buf, H5D_gather_func_t op, void *op_data);
@@ -2808,10 +3077,29 @@ public class H5 implements java.io.Serializable {
      *                - Error from the HDF-5 Library.
      * @exception NullPointerException
      *                - name is null.
+     *
+     * @deprecated As of HDF5 1.10.5 in favor of H5Fis_accessible.
      **/
     public synchronized static native boolean H5Fis_hdf5(String name) throws HDF5LibraryException, NullPointerException;
 
     /**
+     * H5Fis_accessible determines if the file can be opened with the given fapl.
+     *
+     * @param name
+     *            IN: File name to check.
+     * @param file_id
+     *            IN: File identifier for a currently-open HDF5 file
+     *
+     * @return true if file is accessible, false if not.
+     *
+     * @exception HDF5LibraryException
+     *                - Error from the HDF-5 Library.
+     * @exception NullPointerException
+     *                - name is null.
+     **/
+    public synchronized static native boolean H5Fis_accessible(String name, long file_id) throws HDF5LibraryException, NullPointerException;
+
+    /**
      * H5Fmount mounts the file specified by child_id onto the group specified by loc_id and name using the mount
      * properties plist_id.
      *
@@ -2941,21 +3229,64 @@ public class H5 implements java.io.Serializable {
     public synchronized static native void H5Fget_mdc_logging_status(long file_id, boolean[] mdc_logging_status)
             throws HDF5LibraryException, NullPointerException;
 
+    /**
+     * H5Fget_dset_no_attrs_hint gets the file-level setting to create minimized dataset object headers.
+     *
+     * @param file_id
+     *            IN: Identifier of the target file.
+     *
+     * @exception HDF5LibraryException
+     *                - Error from the HDF-5 Library.
+     **/
+    public synchronized static native boolean H5Fget_dset_no_attrs_hint(long file_id)
+            throws HDF5LibraryException;
+
+
+    /**
+     * H5Fset_dset_no_attrs_hint sets the file-level setting to create minimized dataset object headers.
+     *
+     * @param file_id
+     *            IN: Identifier of the target file.
+     * @param minimize
+     *          the minimize hint setting
+     *
+     * @exception HDF5LibraryException
+     *                - Error from the HDF-5 Library.
+     **/
+    public synchronized static native void H5Fset_dset_no_attrs_hint(long file_id, boolean minimize)
+            throws HDF5LibraryException;
+
+
+    /**
+     * H5Fset_libver_bounds sets a different low and high bounds while a file is open.
+     *
+     * @param file_id
+     *            IN: Identifier of the target file.
+     * @param low
+     *            IN: The earliest version of the library that will be used for writing objects
+     * @param high
+     *            IN: The latest version of the library that will be used for writing objects.
+     *
+     * @exception HDF5LibraryException
+     *                - Error from the HDF-5 Library.
+     **/
+    public synchronized static native void H5Fset_libver_bounds(long file_id, int low, int high)
+            throws HDF5LibraryException;
+
     // /////// unimplemented ////////
-    // H5_DLL herr_t H5Fget_eoa(hid_t file_id, haddr_t *eoa);
-    // H5_DLL herr_t H5Fincrement_filesize(hid_t file_id, hsize_t increment);
+    //  herr_t H5Fget_eoa(hid_t file_id, haddr_t *eoa);
+    //  herr_t H5Fincrement_filesize(hid_t file_id, hsize_t increment);
     // ssize_t H5Fget_file_image(hid_t file_id, void * buf_ptr, size_t buf_len);
     // herr_t H5Fget_metadata_read_retry_info(hid_t file_id, H5F_retry_info_t *info);
     // ssize_t H5Fget_free_sections(hid_t file_id, H5F_mem_t type, size_t nsects, H5F_sect_info_t *sect_info/*out*/);
-    // H5_DLL herr_t H5Fset_libver_bounds(hid_t file_id, H5F_libver_t low, H5F_libver_t high);
-    // H5_DLL herr_t H5Fformat_convert(hid_t fid);
-    // H5_DLL herr_t H5Freset_page_buffering_stats(hid_t file_id);
-    // H5_DLL herr_t H5Fget_page_buffering_stats(hid_t file_id, unsigned accesses[2],
+    //  herr_t H5Fformat_convert(hid_t fid);
+    //  herr_t H5Freset_page_buffering_stats(hid_t file_id);
+    //  herr_t H5Fget_page_buffering_stats(hid_t file_id, unsigned accesses[2],
     //     unsigned hits[2], unsigned misses[2], unsigned evictions[2], unsigned bypasses[2]);
-    // H5_DLL herr_t H5Fget_mdc_image_info(hid_t file_id, haddr_t *image_addr, hsize_t *image_size);
+    //  herr_t H5Fget_mdc_image_info(hid_t file_id, haddr_t *image_addr, hsize_t *image_size);
     // #ifdef H5_HAVE_PARALLEL
-    //   H5_DLL herr_t H5Fset_mpi_atomicity(hid_t file_id, hbool_t flag);
-    //   H5_DLL herr_t H5Fget_mpi_atomicity(hid_t file_id, hbool_t *flag);
+    //    herr_t H5Fset_mpi_atomicity(hid_t file_id, hbool_t flag);
+    //    herr_t H5Fget_mpi_atomicity(hid_t file_id, hbool_t *flag);
     // #endif /* H5_HAVE_PARALLEL */
 
     // /**
@@ -3015,25 +3346,25 @@ public class H5 implements java.io.Serializable {
     // ////////////////////////////////////////////////////////////
 
     // /////// unimplemented ////////
-    // H5_DLL hid_t H5FDregister(const H5FD_class_t *cls);
-    // H5_DLL herr_t H5FDunregister(hid_t driver_id);
-    // H5_DLL H5FD_t *H5FDopen(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxaddr);
-    // H5_DLL herr_t H5FDclose(H5FD_t *file);
-    // H5_DLL int H5FDcmp(const H5FD_t *f1, const H5FD_t *f2);
-    // H5_DLL int H5FDquery(const H5FD_t *f, unsigned long *flags);
-    // H5_DLL haddr_t H5FDalloc(H5FD_t *file, H5FD_mem_t type, hid_t dxpl_id, hsize_t size);
-    // H5_DLL herr_t H5FDfree(H5FD_t *file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr, hsize_t size);
-    // H5_DLL haddr_t H5FDget_eoa(H5FD_t *file, H5FD_mem_t type);
-    // H5_DLL herr_t H5FDset_eoa(H5FD_t *file, H5FD_mem_t type, haddr_t eoa);
-    // H5_DLL haddr_t H5FDget_eof(H5FD_t *file, H5FD_mem_t type);
-    // H5_DLL herr_t H5FDget_vfd_handle(H5FD_t *file, hid_t fapl, void**file_handle);
-    // H5_DLL herr_t H5FDread(H5FD_t *file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr, size_t size, void *buf/*out*/);
-    // H5_DLL herr_t H5FDwrite(H5FD_t *file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr, size_t size, const void *buf);
-    // H5_DLL herr_t H5FDflush(H5FD_t *file, hid_t dxpl_id, hbool_t closing);
-    // H5_DLL herr_t H5FDtruncate(H5FD_t *file, hid_t dxpl_id, hbool_t closing);
-    // H5_DLL herr_t H5FDlock(H5FD_t *file, hbool_t rw);
-    // H5_DLL herr_t H5FDunlock(H5FD_t *file);
-    // H5_DLL herr_t H5FDdriver_query(hid_t driver_id, unsigned long *flags/*out*/);
+    //  hid_t H5FDregister(const H5FD_class_t *cls);
+    //  herr_t H5FDunregister(hid_t driver_id);
+    //  H5FD_t *H5FDopen(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxaddr);
+    //  herr_t H5FDclose(H5FD_t *file);
+    //  int H5FDcmp(const H5FD_t *f1, const H5FD_t *f2);
+    //  int H5FDquery(const H5FD_t *f, unsigned long *flags);
+    //  haddr_t H5FDalloc(H5FD_t *file, H5FD_mem_t type, hid_t dxpl_id, hsize_t size);
+    //  herr_t H5FDfree(H5FD_t *file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr, hsize_t size);
+    //  haddr_t H5FDget_eoa(H5FD_t *file, H5FD_mem_t type);
+    //  herr_t H5FDset_eoa(H5FD_t *file, H5FD_mem_t type, haddr_t eoa);
+    //  haddr_t H5FDget_eof(H5FD_t *file, H5FD_mem_t type);
+    //  herr_t H5FDget_vfd_handle(H5FD_t *file, hid_t fapl, void**file_handle);
+    //  herr_t H5FDread(H5FD_t *file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr, size_t size, void *buf/*out*/);
+    //  herr_t H5FDwrite(H5FD_t *file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr, size_t size, const void *buf);
+    //  herr_t H5FDflush(H5FD_t *file, hid_t dxpl_id, hbool_t closing);
+    //  herr_t H5FDtruncate(H5FD_t *file, hid_t dxpl_id, hbool_t closing);
+    //  herr_t H5FDlock(H5FD_t *file, hbool_t rw);
+    //  herr_t H5FDunlock(H5FD_t *file);
+    //  herr_t H5FDdriver_query(hid_t driver_id, unsigned long *flags/*out*/);
 
     // ////////////////////////////////////////////////////////////
     // //
@@ -3506,7 +3837,7 @@ public class H5 implements java.io.Serializable {
 
     // ////////////////////////////////////////////////////////////
     // //
-    // H5I: HDF5 1.8 Identifier Interface API Functions //
+    // H5I: HDF5 Identifier Interface API Functions //
     // //
     // ////////////////////////////////////////////////////////////
 
@@ -3662,12 +3993,20 @@ public class H5 implements java.io.Serializable {
 
     // hid_t H5Iregister(H5I_type_t type, const void *object);
 
+    // typedef herr_t (*H5I_free_t)(void *);
     // H5I_type_t H5Iregister_type(size_t hash_size, unsigned reserved, H5I_free_t free_func);
 
     // void *H5Iremove_verify(hid_t id, H5I_type_t id_type);
 
+    // Type of the function to compare objects & keys
+    // typedef int (*H5I_search_func_t)(void *obj, hid_t id, void *key);
     // void *H5Isearch(H5I_type_t type, H5I_search_func_t func, void *key);
 
+    // Type of the H5Iiterate callback function
+    // typedef herr_t (*H5I_iterate_func_t)(hid_t id, void *udata);
+    // herr_t H5Iiterate(H5I_type_t type, H5I_iterate_func_t op, void *op_data);
+
+
     // //////////////////////////////////////////////////////////////////
     // H5L: Link Interface Functions //
     // //////////////////////////////////////////////////////////////////
@@ -4695,9 +5034,9 @@ public class H5 implements java.io.Serializable {
     public synchronized static native void H5Orefresh(long object_id) throws HDF5LibraryException;
 
     // /////// unimplemented ////////
-    // H5_DLL herr_t H5Odisable_mdc_flushes(hid_t object_id);
-    // H5_DLL herr_t H5Oenable_mdc_flushes(hid_t object_id);
-    // H5_DLL herr_t H5Oare_mdc_flushes_disabled(hid_t object_id, hbool_t *are_disabled);
+    //  herr_t H5Odisable_mdc_flushes(hid_t object_id);
+    //  herr_t H5Oenable_mdc_flushes(hid_t object_id);
+    //  herr_t H5Oare_mdc_flushes_disabled(hid_t object_id, hbool_t *are_disabled);
 
     // ////////////////////////////////////////////////////////////
     // //
@@ -4982,6 +5321,27 @@ public class H5 implements java.io.Serializable {
 
     private synchronized static native long _H5Pcopy(long plist) throws HDF5LibraryException;
 
+    // Define property list class callback function pointer types
+    // typedef herr_t (*H5P_cls_create_func_t)(hid_t prop_id, void *create_data);
+    // typedef herr_t (*H5P_cls_copy_func_t)(hid_t new_prop_id, hid_t old_prop_id, void *copy_data);
+    // typedef herr_t (*H5P_cls_close_func_t)(hid_t prop_id, void *close_data);
+
+    // Define property list callback function pointer types
+    // typedef herr_t (*H5P_prp_cb1_t)(const char *name, size_t size, void *value);
+    // typedef herr_t (*H5P_prp_cb2_t)(hid_t prop_id, const char *name, size_t size, void *value);
+    // typedef H5P_prp_cb1_t H5P_prp_create_func_t;
+    // typedef H5P_prp_cb2_t H5P_prp_set_func_t;
+    // typedef H5P_prp_cb2_t H5P_prp_get_func_t;
+    // typedef herr_t (*H5P_prp_encode_func_t)(const void *value, void **buf, size_t *size);
+    // typedef herr_t (*H5P_prp_decode_func_t)(const void **buf, void *value);
+    // typedef H5P_prp_cb2_t H5P_prp_delete_func_t;
+    // typedef H5P_prp_cb1_t H5P_prp_copy_func_t;
+    // typedef int (*H5P_prp_compare_func_t)(const void *value1, const void *value2, size_t size);
+    // typedef H5P_prp_cb1_t H5P_prp_close_func_t;
+
+    // Define property list iteration function type
+    // typedef herr_t (*H5P_iterate_t)(hid_t id, const char *name, void *iter_data);
+
     public static long H5Pcreate_class_nocb(long parent_class, String name) throws HDF5LibraryException {
         long id = _H5Pcreate_class_nocb(parent_class, name);
           if (id > 0) {
@@ -6145,6 +6505,11 @@ public class H5 implements java.io.Serializable {
     public synchronized static native void H5Pset_evict_on_close(long fapl_id, boolean evict_on_close)
             throws HDF5LibraryException;
 
+    //  /////  unimplemented /////
+    // herr_t H5Pset_vol(hid_t plist_id, hid_t new_vol_id, const void *new_vol_info);
+    // herr_t H5Pget_vol_id(hid_t plist_id, hid_t *vol_id);
+    // herr_t H5Pget_vol_info(hid_t plist_id, void **vol_info);
+
     // Dataset creation property list (DCPL) routines //
 
     /**
@@ -6600,8 +6965,6 @@ public class H5 implements java.io.Serializable {
     public synchronized static native int H5Pset_fill_time(long plist_id, int fill_time) throws HDF5LibraryException,
     NullPointerException;
 
-    // /////// Dataset creation property list (DCPL) routines ///////
-
     /**
      * H5Pset_chunk_opts Sets the edge chunk option in a dataset creation property list.
      *
@@ -6630,6 +6993,36 @@ public class H5 implements java.io.Serializable {
      **/
     public synchronized static native int H5Pget_chunk_opts(long dcpl_id) throws HDF5LibraryException;
 
+    /**
+     * H5Pget_dset_no_attrs_hint accesses the flag for whether or not datasets created by the given dcpl
+     *     will be created with a "minimized" object header.
+     *
+     * @param dcpl_id
+     *            IN: Dataset creation property list
+     *
+     * @exception HDF5LibraryException
+     *                - Error from the HDF-5 Library.
+     **/
+    public synchronized static native boolean H5Pget_dset_no_attrs_hint(long dcpl_id)
+            throws HDF5LibraryException;
+
+
+    /**
+     * H5Pset_dset_no_attrs_hint sets the dcpl to minimize (or explicitly to not minimized) dataset object
+     *     headers upon creation.
+     *
+     * @param dcpl_id
+     *            IN: Dataset creation property list
+     *
+     * @param minimize
+     *          the minimize hint setting
+     *
+     * @exception HDF5LibraryException
+     *                - Error from the HDF-5 Library.
+     **/
+    public synchronized static native void H5Pset_dset_no_attrs_hint(long dcpl_id, boolean minimize)
+            throws HDF5LibraryException;
+
     // /////// Dataset access property list (DAPL) routines ///////
 
     /**
@@ -7336,34 +7729,6 @@ public class H5 implements java.io.Serializable {
     public synchronized static native void H5Pset_copy_object(long ocp_plist_id, int copy_options)
             throws HDF5LibraryException;
 
-    // /////// Other/Older property list routines ///////
-
-    /**
-     * H5Pget_version retrieves the version information of various objects for a file creation property list.
-     *
-     * @param plist
-     *            IN: Identifier of the file creation property list.
-     * @param version_info
-     *            OUT: version information.
-     *
-     *            <pre>
-     *      version_info[0] = boot  // boot block version number
-     *      version_info[1] = freelist  // global freelist version
-     *      version_info[2] = stab  // symbol tabl version number
-     *      version_info[3] = shhdr  // shared object header version
-     * </pre>
-     * @return a non-negative value, with the values of version_info initialized, if successful
-     *
-     * @exception HDF5LibraryException
-     *                - Error from the HDF-5 Library.
-     * @exception NullPointerException
-     *                - version_info is null.
-     * @exception IllegalArgumentException
-     *                - version_info is illegal.
-     **/
-    public synchronized static native int H5Pget_version(long plist, int[] version_info) throws HDF5LibraryException,
-    NullPointerException, IllegalArgumentException;
-
     // /////// file drivers property list routines ///////
 
     public synchronized static native void H5Pget_fapl_core(long fapl_id, long[] increment, boolean[] backing_store)
@@ -7523,13 +7888,13 @@ public class H5 implements java.io.Serializable {
     // herr_t H5Pget_core_write_tracking(hid_t fapl_id, hbool_t *is_enabled, size_t *page_size);
     // #ifdef H5_HAVE_PARALLEL
     // herr_t H5Pset_all_coll_metadata_ops(hid_t accpl_id, hbool_t is_collective);
-    // H5_DLL herr_t H5Pget_all_coll_metadata_ops(hid_t plist_id, hbool_t *is_collective);
+    //  herr_t H5Pget_all_coll_metadata_ops(hid_t plist_id, hbool_t *is_collective);
     // herr_t H5Pset_coll_metadata_write(hid_t fapl_id, hbool_t is_collective);
     // herr_t H5Pget_coll_metadata_write(hid_t fapl_id, hbool_t *is_collective);
     // #endif /* H5_HAVE_PARALLEL */
-    // H5_DLL herr_t H5Pset_mdc_image_config(hid_t plist_id, H5AC_cache_image_config_t *config_ptr);
-    // H5_DLL herr_t H5Pget_mdc_image_config(hid_t plist_id, H5AC_cache_image_config_t *config_ptr /*out*/);
-    // H5_DLL herr_t H5Pset_page_buffer_size(hid_t plist_id, size_t buf_size, unsigned min_meta_per, unsigned min_raw_per);
+    //  herr_t H5Pset_mdc_image_config(hid_t plist_id, H5AC_cache_image_config_t *config_ptr);
+    //  herr_t H5Pget_mdc_image_config(hid_t plist_id, H5AC_cache_image_config_t *config_ptr /*out*/);
+    //  herr_t H5Pset_page_buffer_size(hid_t plist_id, size_t buf_size, unsigned min_meta_per, unsigned min_raw_per);
     // herr_t H5Pget_page_buffer_size(hid_t fapl_id, size_t *buf_size, unsigned *min_meta_perc, unsigned *min_raw_perc);
     // herr_t H5Pset_object_flush_cb (hid_t fapl_id, H5F_flush_cb_t func, void *user_data);
     // herr_t H5Pget_object_flush_cb (hid_t fapl_id, H5F_flush_cb_t *func, void **user_data);
@@ -7552,9 +7917,9 @@ public class H5 implements java.io.Serializable {
     // herr_t H5Pget_type_conv_cb(hid_t plist, H5T_conv_except_func_t *func, void **op_data)
     // herr_t H5Pset_type_conv_cb( hid_t plist, H5T_conv_except_func_t func, void *op_data)
     // #ifdef H5_HAVE_PARALLEL
-    // H5_DLL herr_t H5Pget_mpio_actual_chunk_opt_mode(hid_t plist_id, H5D_mpio_actual_chunk_opt_mode_t *actual_chunk_opt_mode);
-    // H5_DLL herr_t H5Pget_mpio_actual_io_mode(hid_t plist_id, H5D_mpio_actual_io_mode_t *actual_io_mode);
-    // H5_DLL herr_t H5Pget_mpio_no_collective_cause(hid_t plist_id, uint32_t *local_no_collective_cause, uint32_t *global_no_collective_cause);
+    //  herr_t H5Pget_mpio_actual_chunk_opt_mode(hid_t plist_id, H5D_mpio_actual_chunk_opt_mode_t *actual_chunk_opt_mode);
+    //  herr_t H5Pget_mpio_actual_io_mode(hid_t plist_id, H5D_mpio_actual_io_mode_t *actual_io_mode);
+    //  herr_t H5Pget_mpio_no_collective_cause(hid_t plist_id, uint32_t *local_no_collective_cause, uint32_t *global_no_collective_cause);
     // #endif /* H5_HAVE_PARALLEL */
 
     // Link creation property list (LCPL) routines //
@@ -8497,16 +8862,17 @@ public class H5 implements java.io.Serializable {
 
     // /////// unimplemented ////////
     // #ifdef NEW_HYPERSLAB_API
-    // H5_DLL hid_t H5Scombine_hyperslab(hid_t space_id, H5S_seloper_t op,
+    //  hid_t H5Scombine_hyperslab(hid_t space_id, H5S_seloper_t op,
     //                                  const hsize_t start[],
     //                                  const hsize_t _stride[],
     //                                  const hsize_t count[],
     //                                  const hsize_t _block[]);
-    // H5_DLL herr_t H5Sselect_select(hid_t space1_id, H5S_seloper_t op,
+    // herr_t H5Sselect_select(hid_t space1_id, H5S_seloper_t op,
     //                                  hid_t space2_id);
-    // H5_DLL hid_t H5Scombine_select(hid_t space1_id, H5S_seloper_t op,
+    // hid_t H5Scombine_select(hid_t space1_id, H5S_seloper_t op,
     //                                  hid_t space2_id);
     // #endif /* NEW_HYPERSLAB_API */
+    // herr_t H5Sselect_copy(hid_t dst_id, hid_t src_id);
 
 
 
@@ -9985,6 +10351,25 @@ public class H5 implements java.io.Serializable {
 
     // ////////////////////////////////////////////////////////////
     // //
+    // H5VL: VOL Interface Functions //
+    // //
+    // ////////////////////////////////////////////////////////////
+
+    /// VOL Connector Functionality
+    public synchronized static native long H5VLregister_connector_by_name(String connector_name, long vipl_id);
+    public synchronized static native long H5VLregister_connector_by_value(int connector_value, long vipl_id);
+    public synchronized static native boolean H5VLis_connector_registered(String name);
+    public synchronized static native long H5VLget_connector_id(String name);
+    public synchronized static native String H5VLget_connector_name(long object_id);
+    public synchronized static native void H5VLclose(long connector_id);
+    public synchronized static native void H5VLunregister_connector(long connector_id);
+
+    // /////// unimplemented ////////
+    // hid_t H5VLregister_connector(const H5VL_class_t *cls, hid_t vipl_id);
+
+
+    // ////////////////////////////////////////////////////////////
+    // //
     // H5Z: Filter Interface Functions //
     // //
     // ////////////////////////////////////////////////////////////
@@ -9995,9 +10380,9 @@ public class H5 implements java.io.Serializable {
 
     public synchronized static native int H5Zunregister(int filter) throws HDF5LibraryException, NullPointerException;
 
-}
+    // /////// unimplemented ////////
 
-// /////// unimplemented ////////
+    // herr_t H5Zregister(const void *cls);
 
-// herr_t H5Zregister(const void *cls);
+}
 
diff --git a/java/src/hdf/hdf5lib/HDF5Constants.java b/java/src/hdf/hdf5lib/HDF5Constants.java
index b530f4b..a0c2ed6 100644
--- a/java/src/hdf/hdf5lib/HDF5Constants.java
+++ b/java/src/hdf/hdf5lib/HDF5Constants.java
@@ -195,6 +195,11 @@ public class HDF5Constants {
     public static final long H5E_WALK_UPWARD = H5E_WALK_UPWARD();
     public static final long H5E_WRITEERROR = H5E_WRITEERROR();
 
+    private static final int H5ES_STATUS_IN_PROGRESS = H5ES_STATUS_IN_PROGRESS();
+    private static final int H5ES_STATUS_SUCCEED = H5ES_STATUS_SUCCEED();
+    private static final int H5ES_STATUS_FAIL = H5ES_STATUS_FAIL();
+    private static final int H5ES_STATUS_CANCELED = H5ES_STATUS_CANCELED();
+
     public static final int H5F_ACC_CREAT = H5F_ACC_CREAT();
     public static final int H5F_ACC_EXCL = H5F_ACC_EXCL();
     public static final int H5F_ACC_RDONLY = H5F_ACC_RDONLY();
@@ -315,7 +320,6 @@ public class HDF5Constants {
     public static final int H5I_GROUP = H5I_GROUP();
     public static final int H5I_INVALID_HID = H5I_INVALID_HID();
     public static final int H5I_NTYPES = H5I_NTYPES();
-    public static final int H5I_REFERENCE = H5I_REFERENCE();
     public static final int H5I_UNINIT = H5I_UNINIT();
     public static final int H5I_VFL = H5I_VFL();
     public static final int H5I_VOL = H5I_VOL();
@@ -390,7 +394,10 @@ public class HDF5Constants {
 
     public static final int H5PL_TYPE_ERROR = H5PL_TYPE_ERROR();
     public static final int H5PL_TYPE_FILTER = H5PL_TYPE_FILTER();
+    public static final int H5PL_TYPE_VOL = H5PL_TYPE_VOL();
+    public static final int H5PL_TYPE_NONE = H5PL_TYPE_NONE();
     public static final int H5PL_FILTER_PLUGIN = H5PL_FILTER_PLUGIN();
+    public static final int H5PL_VOL_PLUGIN = H5PL_VOL_PLUGIN();
     public static final int H5PL_ALL_PLUGIN = H5PL_ALL_PLUGIN();
 
     public static final int H5R_BADTYPE = H5R_BADTYPE();
@@ -626,6 +633,18 @@ public class HDF5Constants {
     public static final long H5T_VARIABLE = H5T_VARIABLE();
     public static final int H5T_VLEN = H5T_VLEN();
     public static final int H5T_VL_T = H5T_VL_T();
+
+    public static final int H5VL_CAP_FLAG_NONE = H5VL_CAP_FLAG_NONE();
+    public static final int H5VL_CAP_FLAG_THREADSAFE = H5VL_CAP_FLAG_THREADSAFE();
+    public static final long H5VL_NATIVE = H5VL_NATIVE();
+    public static final String H5VL_NATIVE_NAME = H5VL_NATIVE_NAME();
+    public static final int H5VL_NATIVE_VALUE = H5VL_NATIVE_VALUE();
+    public static final int H5VL_NATIVE_VERSION = H5VL_NATIVE_VERSION();
+    public static final int H5_VOL_INVALID = H5_VOL_INVALID();
+    public static final int H5_VOL_NATIVE = H5_VOL_NATIVE();
+    public static final int H5_VOL_RESERVED = H5_VOL_RESERVED();
+    public static final int H5_VOL_MAX = H5_VOL_MAX();
+
     public static final int H5Z_CB_CONT = H5Z_CB_CONT();
     public static final int H5Z_CB_ERROR = H5Z_CB_ERROR();
     public static final int H5Z_CB_FAIL = H5Z_CB_FAIL();
@@ -990,6 +1009,14 @@ public class HDF5Constants {
 
     private static native final long H5E_WRITEERROR();
 
+    private static native final int H5ES_STATUS_IN_PROGRESS();
+
+    private static native final int H5ES_STATUS_SUCCEED();
+
+    private static native final int H5ES_STATUS_FAIL();
+
+    private static native final int H5ES_STATUS_CANCELED();
+
     private static native final int H5F_ACC_CREAT();
 
     private static native final int H5F_ACC_EXCL();
@@ -1222,8 +1249,6 @@ public class HDF5Constants {
 
     private static native final int H5I_NTYPES();
 
-    private static native final int H5I_REFERENCE();
-
     private static native final int H5I_UNINIT();
 
     private static native final int H5I_VFL();
@@ -1364,10 +1389,16 @@ public class HDF5Constants {
 
     private static native final int H5PL_TYPE_FILTER();
 
+    private static native final int H5PL_TYPE_VOL();
+
+    private static native final int H5PL_TYPE_NONE();
+
     private static native final int H5PL_FILTER_PLUGIN();
 
     private static native final int H5PL_ALL_PLUGIN();
 
+    private static native final int H5PL_VOL_PLUGIN();
+
     private static native final int H5R_BADTYPE();
 
     private static native final int H5R_DATASET_REGION();
@@ -1834,6 +1865,26 @@ public class HDF5Constants {
 
     private static native final int H5T_VL_T();
 
+    private static native final int H5VL_CAP_FLAG_NONE();
+
+    private static native final int H5VL_CAP_FLAG_THREADSAFE();
+
+    private static native final long H5VL_NATIVE();
+
+    private static native final String H5VL_NATIVE_NAME();
+
+    private static native final int H5VL_NATIVE_VALUE();
+
+    private static native final int H5VL_NATIVE_VERSION();
+
+    private static native final int H5_VOL_INVALID();
+
+    private static native final int H5_VOL_NATIVE();
+
+    private static native final int H5_VOL_RESERVED();
+
+    private static native final int H5_VOL_MAX();
+
     private static native final int H5Z_CB_CONT();
 
     private static native final int H5Z_CB_ERROR();
diff --git a/java/src/jni/CMakeLists.txt b/java/src/jni/CMakeLists.txt
index 7b95e0b..00c2b34 100644
--- a/java/src/jni/CMakeLists.txt
+++ b/java/src/jni/CMakeLists.txt
@@ -19,6 +19,7 @@ set (HDF5_JAVA_JNI_CSRCS
     ${HDF5_JAVA_JNI_SOURCE_DIR}/h5sImp.c
     ${HDF5_JAVA_JNI_SOURCE_DIR}/h5tImp.c
     ${HDF5_JAVA_JNI_SOURCE_DIR}/h5util.c
+    ${HDF5_JAVA_JNI_SOURCE_DIR}/h5vlImp.c
     ${HDF5_JAVA_JNI_SOURCE_DIR}/h5zImp.c
     ${HDF5_JAVA_JNI_SOURCE_DIR}/nativeData.c
 )
@@ -40,6 +41,7 @@ set (HDF5_JAVA_JNI_CHDRS
     ${HDF5_JAVA_JNI_SOURCE_DIR}/h5sImp.h
     ${HDF5_JAVA_JNI_SOURCE_DIR}/h5tImp.h
     ${HDF5_JAVA_JNI_SOURCE_DIR}/h5util.h
+    ${HDF5_JAVA_JNI_SOURCE_DIR}/h5vlImp.h
     ${HDF5_JAVA_JNI_SOURCE_DIR}/h5zImp.h
     ${HDF5_JAVA_JNI_SOURCE_DIR}/nativeData.h
 )
@@ -48,7 +50,9 @@ set (CMAKE_INCLUDE_CURRENT_DIR_IN_INTERFACE ON)
 
 ########### JNI libraries always must be built shared  ###############
 add_library (${HDF5_JAVA_JNI_LIB_TARGET} SHARED ${HDF5_JAVA_JNI_CSRCS} ${HDF5_JAVA_JNI_CHDRS})
-target_include_directories(${HDF5_JAVA_JNI_LIB_TARGET} PRIVATE ${HDF5_BINARY_DIR} ${HDF5_JAVA_JNI_SOURCE_DIR})
+target_include_directories(${HDF5_JAVA_JNI_LIB_TARGET}
+    PRIVATE "${HDF5_BINARY_DIR};${HDF5_JAVA_JNI_SOURCE_DIR};$<$<BOOL:${HDF5_ENABLE_PARALLEL}>:${MPI_C_INCLUDE_DIRS}>"
+)
 TARGET_C_PROPERTIES (${HDF5_JAVA_JNI_LIB_TARGET} SHARED)
 target_link_libraries (${HDF5_JAVA_JNI_LIB_TARGET} PUBLIC ${HDF5_LIBSH_TARGET})
 set_target_properties (${HDF5_JAVA_JNI_LIB_TARGET} PROPERTIES FOLDER libraries/jni)
diff --git a/java/src/jni/Makefile.am b/java/src/jni/Makefile.am
index 6ded371..370b08b 100644
--- a/java/src/jni/Makefile.am
+++ b/java/src/jni/Makefile.am
@@ -34,7 +34,7 @@ libhdf5_java_la_LDFLAGS = -avoid-version -shared -export-dynamic -version-info $
 # Source files for the library
 libhdf5_java_la_SOURCES=exceptionImp.c h5Constants.c nativeData.c h5util.c h5Imp.c \
 	h5aImp.c h5dImp.c h5eImp.c h5fImp.c h5gImp.c h5iImp.c h5lImp.c h5oImp.c    \
-	h5pImp.c h5plImp.c h5rImp.c h5sImp.c h5tImp.c h5zImp.c
+	h5pImp.c h5plImp.c h5rImp.c h5sImp.c h5tImp.c h5vlImp.c h5zImp.c
 
 # HDF5 Java (JNI) library depends on HDF5 Library.
 libhdf5_java_la_LIBADD=$(LIBHDF5)
diff --git a/java/src/jni/h5Constants.c b/java/src/jni/h5Constants.c
index fdec61a..e88fa55 100644
--- a/java/src/jni/h5Constants.c
+++ b/java/src/jni/h5Constants.c
@@ -21,8 +21,10 @@
 extern "C" {
 #endif /* __cplusplus */
 
-#include <jni.h>
 #include "hdf5.h"
+#include <jni.h>
+#include <stdlib.h>
+#include "h5jni.h"
 
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wmissing-prototypes"
@@ -352,6 +354,15 @@ Java_hdf_hdf5lib_HDF5Constants_H5E_1WALK_1UPWARD(JNIEnv *env, jclass cls) { retu
 JNIEXPORT jlong JNICALL
 Java_hdf_hdf5lib_HDF5Constants_H5E_1WRITEERROR(JNIEnv *env, jclass cls) { return H5E_WRITEERROR; }
 
+JNIEXPORT jlong JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5ES_1STATUS_1IN_1PROGRESS(JNIEnv *env, jclass cls) { return H5ES_STATUS_IN_PROGRESS; }
+JNIEXPORT jlong JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5ES_1STATUS_1SUCCEED(JNIEnv *env, jclass cls) { return H5ES_STATUS_SUCCEED; }
+JNIEXPORT jlong JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5ES_1STATUS_1FAIL(JNIEnv *env, jclass cls) { return H5ES_STATUS_FAIL; }
+JNIEXPORT jlong JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5ES_1STATUS_1CANCELED(JNIEnv *env, jclass cls) { return H5ES_STATUS_CANCELED; }
+
 /* Java does not have unsigned native types */
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wsign-conversion"
@@ -603,8 +614,6 @@ Java_hdf_hdf5lib_HDF5Constants_H5I_1DATASET(JNIEnv *env, jclass cls) { return H5
 JNIEXPORT jint JNICALL
 Java_hdf_hdf5lib_HDF5Constants_H5I_1ATTR(JNIEnv *env, jclass cls) { return H5I_ATTR; }
 JNIEXPORT jint JNICALL
-Java_hdf_hdf5lib_HDF5Constants_H5I_1REFERENCE(JNIEnv *env, jclass cls) { return H5I_REFERENCE; }
-JNIEXPORT jint JNICALL
 Java_hdf_hdf5lib_HDF5Constants_H5I_1VFL(JNIEnv *env, jclass cls) { return H5I_VFL; }
 JNIEXPORT jint JNICALL
 Java_hdf_hdf5lib_HDF5Constants_H5I_1VOL(JNIEnv *env, jclass cls) { return H5I_VOL; }
@@ -763,8 +772,14 @@ Java_hdf_hdf5lib_HDF5Constants_H5PL_1TYPE_1ERROR(JNIEnv *env, jclass cls) { retu
 JNIEXPORT jint JNICALL
 Java_hdf_hdf5lib_HDF5Constants_H5PL_1TYPE_1FILTER(JNIEnv *env, jclass cls) { return H5PL_TYPE_FILTER; }
 JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5PL_1TYPE_1VOL(JNIEnv *env, jclass cls) { return H5PL_TYPE_VOL; }
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5PL_1TYPE_1NONE(JNIEnv *env, jclass cls) { return H5PL_TYPE_NONE; }
+JNIEXPORT jint JNICALL
 Java_hdf_hdf5lib_HDF5Constants_H5PL_1FILTER_1PLUGIN(JNIEnv *env, jclass cls) { return H5PL_FILTER_PLUGIN; }
 JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5PL_1VOL_1PLUGIN(JNIEnv *env, jclass cls) { return H5PL_VOL_PLUGIN; }
+JNIEXPORT jint JNICALL
 Java_hdf_hdf5lib_HDF5Constants_H5PL_1ALL_1PLUGIN(JNIEnv *env, jclass cls) { return H5PL_ALL_PLUGIN; }
 
 JNIEXPORT jint JNICALL
@@ -1239,6 +1254,28 @@ JNIEXPORT jint JNICALL
 Java_hdf_hdf5lib_HDF5Constants_H5T_1VL_1T(JNIEnv *env, jclass cls) { return sizeof(hvl_t); }
 
 JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5VL_1CAP_1FLAG_1NONE(JNIEnv *env, jclass cls) { return H5VL_CAP_FLAG_NONE; }
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5VL_1CAP_1FLAG_1THREADSAFE(JNIEnv *env, jclass cls) { return H5VL_CAP_FLAG_THREADSAFE; }
+JNIEXPORT jlong JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5VL_1NATIVE(JNIEnv *env, jclass cls) { return H5VL_NATIVE; }
+JNIEXPORT jobject JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5VL_1NATIVE_1NAME(JNIEnv *env, jclass cls) { return (jstring)ENVPTR->NewStringUTF(ENVPAR H5VL_NATIVE_NAME); }
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5VL_1NATIVE_1VALUE(JNIEnv *env, jclass cls) { return H5VL_NATIVE_VALUE; }
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5VL_1NATIVE_1VERSION(JNIEnv *env, jclass cls) { return H5VL_NATIVE_VERSION; }
+
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5_1VOL_1INVALID(JNIEnv *env, jclass cls) { return H5_VOL_INVALID; }
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5_1VOL_1NATIVE(JNIEnv *env, jclass cls) { return H5_VOL_NATIVE; }
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5_1VOL_1RESERVED(JNIEnv *env, jclass cls) { return H5_VOL_RESERVED; }
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_HDF5Constants_H5_1VOL_1MAX(JNIEnv *env, jclass cls) { return H5_VOL_MAX; }
+
+JNIEXPORT jint JNICALL
 Java_hdf_hdf5lib_HDF5Constants_H5Z_1CB_1CONT(JNIEnv *env, jclass cls) { return H5Z_CB_CONT; }
 JNIEXPORT jint JNICALL
 Java_hdf_hdf5lib_HDF5Constants_H5Z_1CB_1ERROR(JNIEnv *env, jclass cls) { return H5Z_CB_ERROR; }
diff --git a/java/src/jni/h5aImp.c b/java/src/jni/h5aImp.c
index aba2240..e0ec4ca 100644
--- a/java/src/jni/h5aImp.c
+++ b/java/src/jni/h5aImp.c
@@ -60,6 +60,94 @@ static herr_t H5AreadVL_str (JNIEnv *env, hid_t attr_id, hid_t mem_id, jobjectAr
 
 static herr_t H5A_iterate_cb(hid_t g_id, const char *name, const H5A_info_t *info, void *cb_data);
 
+/********************/
+/* Local Macros     */
+/********************/
+
+#define PIN_BYTE_ARRAY() { \
+    if (isCriticalPinning) \
+        buffP = (jbyte*)ENVPTR->GetPrimitiveArrayCritical(ENVPAR buf, &isCopy); \
+    else \
+        buffP = ENVPTR->GetByteArrayElements(ENVPAR buf, &isCopy); \
+}
+
+#define UNPIN_BYTE_ARRAY(mode) { \
+    if (isCriticalPinning) \
+        ENVPTR->ReleasePrimitiveArrayCritical(ENVPAR buf, buffP, mode); \
+    else \
+        ENVPTR->ReleaseByteArrayElements(ENVPAR buf, buffP, mode); \
+}
+
+#define PIN_SHORT_ARRAY() { \
+    if (isCriticalPinning) \
+        buffP = (jshort*)ENVPTR->GetPrimitiveArrayCritical(ENVPAR buf, &isCopy); \
+    else \
+        buffP = ENVPTR->GetShortArrayElements(ENVPAR buf, &isCopy); \
+}
+
+#define UNPIN_SHORT_ARRAY(mode) { \
+    if (isCriticalPinning) \
+        ENVPTR->ReleasePrimitiveArrayCritical(ENVPAR buf, buffP, mode); \
+    else \
+        ENVPTR->ReleaseShortArrayElements(ENVPAR buf, buffP, mode); \
+}
+
+#define PIN_INT_ARRAY() { \
+    if (isCriticalPinning) \
+        buffP = (jint*)ENVPTR->GetPrimitiveArrayCritical(ENVPAR buf, &isCopy); \
+    else \
+        buffP = ENVPTR->GetIntArrayElements(ENVPAR buf, &isCopy); \
+}
+
+#define UNPIN_INT_ARRAY(mode) { \
+    if (isCriticalPinning) \
+        ENVPTR->ReleasePrimitiveArrayCritical(ENVPAR buf, buffP, mode); \
+    else \
+        ENVPTR->ReleaseIntArrayElements(ENVPAR buf, buffP, mode); \
+}
+
+#define PIN_LONG_ARRAY() { \
+    if (isCriticalPinning) \
+        buffP = (jlong*)ENVPTR->GetPrimitiveArrayCritical(ENVPAR buf, &isCopy); \
+    else \
+        buffP = ENVPTR->GetLongArrayElements(ENVPAR buf,&isCopy); \
+}
+
+#define UNPIN_LONG_ARRAY(mode) { \
+    if (isCriticalPinning) \
+        ENVPTR->ReleasePrimitiveArrayCritical(ENVPAR buf, buffP, mode); \
+    else \
+        ENVPTR->ReleaseLongArrayElements(ENVPAR buf, buffP, mode); \
+}
+
+#define PIN_FLOAT_ARRAY() { \
+    if (isCriticalPinning) \
+        buffP = (jfloat*)ENVPTR->GetPrimitiveArrayCritical(ENVPAR buf, &isCopy); \
+    else \
+        buffP = ENVPTR->GetFloatArrayElements(ENVPAR buf, &isCopy); \
+}
+
+#define UNPIN_FLOAT_ARRAY(mode) { \
+    if (isCriticalPinning) \
+        ENVPTR->ReleasePrimitiveArrayCritical(ENVPAR buf, buffP, mode); \
+    else \
+        ENVPTR->ReleaseFloatArrayElements(ENVPAR buf, buffP, mode); \
+}
+
+#define PIN_DOUBLE_ARRAY() { \
+    if (isCriticalPinning) \
+        buffP = (jdouble*)ENVPTR->GetPrimitiveArrayCritical(ENVPAR buf, &isCopy); \
+    else \
+        buffP = ENVPTR->GetDoubleArrayElements(ENVPAR buf, &isCopy); \
+}
+
+#define UNPIN_DOUBLE_ARRAY(mode) { \
+    if (isCriticalPinning) \
+        ENVPTR->ReleasePrimitiveArrayCritical(ENVPAR buf, buffP, mode); \
+    else \
+        ENVPTR->ReleaseDoubleArrayElements(ENVPAR buf, buffP, mode); \
+}
+
 
 /*
  * Class:     hdf_hdf5lib_H5
@@ -129,36 +217,129 @@ Java_hdf_hdf5lib_H5__1H5Aopen_1idx
     return (jlong)attr_id;
 } /* end Java_hdf_hdf5lib_H5__1H5Aopen_1idx */
 
+static htri_t
+H5Tdetect_variable_str
+    (hid_t tid) {
+    htri_t ret_val = 0;
+
+    if (H5Tget_class(tid) == H5T_COMPOUND) {
+        unsigned i;
+        unsigned nm = (unsigned)H5Tget_nmembers(tid);
+        for(i = 0; i < nm; i++) {
+            htri_t status = 0;
+            hid_t mtid = 0;
+            if((mtid = H5Tget_member_type(tid, i)) < 0)
+                return -1; /* exit immediately on error */
+            if((status = H5Tdetect_variable_str(mtid)) < 0)
+                return status; /* exit immediately on error */
+            ret_val |= status;
+            H5Tclose (mtid);
+        } /* end for */
+    } /* end if */
+    else
+        ret_val = H5Tis_variable_str(tid);
+
+    return ret_val;
+} /* end H5Tdetect_variable_str */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Aread
+ * Signature: (JJ[BZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Aread
+    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jbyteArray buf, jboolean isCriticalPinning)
+{
+    herr_t   status = -1;
+    jbyte   *buffP;
+    jboolean isCopy;
+    htri_t data_class;
+
+    if (buf == NULL) {
+        h5nullArgument( env,"H5Aread:  buf is NULL");
+    } /* end if */
+    else if((data_class = H5Tdetect_class(mem_type_id, H5T_VLEN)) < 0) {
+        h5JNIFatalError(env, "H5Aread: H5Tdetect_class() failed");
+    } /* end else if */
+    else  if(data_class == 1) {
+        h5badArgument(env, "H5Aread:  buf does not support variable length type");
+    } /* end else if */
+    else {
+        /* recursive detect any vlen string in type (compound, array ...) */
+        if((data_class = H5Tdetect_variable_str(mem_type_id)) < 0) {
+            h5JNIFatalError(env, "H5Aread: H5Tdetect_variable_str() failed");
+        } /* end if */
+        else  if(data_class == 1) {
+            h5badArgument(env, "H5Aread:  buf does not support variable length type");
+        } /* end else if */
+        else {
+            PIN_BYTE_ARRAY();
+
+            if (buffP == NULL) {
+                h5JNIFatalError(env, "H5Aread:  buf not pinned");
+            } /* end if */
+            else {
+                status = H5Aread((hid_t)attr_id, (hid_t)mem_type_id, buffP);
+                if (status < 0) {
+                    UNPIN_BYTE_ARRAY(JNI_ABORT);
+                    h5libraryError(env);
+                } /* end if */
+                else {
+                    UNPIN_BYTE_ARRAY(0); /* update java buffer for return */
+                } /* end else */
+            } /* end else */
+        } /* end else */
+    } /* end else */
+
+    return (jint)status;
+} /* end Java_hdf_hdf5lib_H5_H5Aread */
+
 /*
  * Class:     hdf_hdf5lib_H5
  * Method:    H5Awrite
- * Signature: (JJ[B)I
+ * Signature: (JJ[BZ)I
  */
 JNIEXPORT jint JNICALL
 Java_hdf_hdf5lib_H5_H5Awrite
-    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jbyteArray buf)
+    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jbyteArray buf, jboolean isCriticalPinning)
 {
     herr_t   status = -1;
-    jbyte   *byteP;
+    jbyte   *buffP;
     jboolean isCopy;
+    htri_t data_class;
 
     if (buf == NULL) {
         h5nullArgument( env,"H5Awrite:  buf is NULL");
     } /* end if */
+    else if((data_class = H5Tdetect_class(mem_type_id, H5T_VLEN)) < 0) {
+        h5JNIFatalError(env, "H5Awrite: H5Tdetect_class() failed");
+    } /* end else if */
+    else  if(data_class == 1) {
+        h5badArgument(env, "H5Awrite:  buf does not support variable length type");
+    } /* end else if */
     else {
-        byteP = ENVPTR->GetByteArrayElements(ENVPAR buf, &isCopy);
-        if (byteP == NULL) {
-            h5JNIFatalError(env,"H5Awrite: buf is not pinned");
+        /* recursive detect any vlen string in type (compound, array ...) */
+        if((data_class = H5Tdetect_variable_str(mem_type_id)) < 0) {
+            h5JNIFatalError(env, "H5Awrite: H5Tdetect_variable_str() failed");
         } /* end if */
+        else  if(data_class == 1) {
+            h5badArgument(env, "H5Awrite:  buf does not support variable length type");
+        } /* end else if */
         else {
-            status = H5Awrite((hid_t)attr_id, (hid_t)mem_type_id, byteP);
+            PIN_BYTE_ARRAY();
+            if (buffP == NULL) {
+                h5JNIFatalError(env, "H5Awrite:  buf not pinned");
+            } /* end if */
+            else {
+                status = H5Awrite((hid_t)attr_id, (hid_t)mem_type_id, buffP);
 
-            /* free the buffer without copying back */
-            ENVPTR->ReleaseByteArrayElements(ENVPAR buf, byteP, JNI_ABORT);
+                UNPIN_BYTE_ARRAY(JNI_ABORT); /* no need to update buffer */
 
-            if (status < 0)
-                h5libraryError(env);
-        }
+                if (status < 0)
+                    h5libraryError(env);
+            } /* end else */
+        } /* end else */
     } /* end else */
 
     return (jint)status;
@@ -166,190 +347,653 @@ Java_hdf_hdf5lib_H5_H5Awrite
 
 /*
  * Class:     hdf_hdf5lib_H5
- * Method:    H5Aread
- * Signature: (JJ[B)I
+ * Method:    H5Aread_short
+ * Signature: (JJ[SZ)I
  */
 JNIEXPORT jint JNICALL
-Java_hdf_hdf5lib_H5_H5Aread
-    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jbyteArray buf)
+Java_hdf_hdf5lib_H5_H5Aread_1short
+    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jshortArray buf, jboolean isCriticalPinning)
 {
     herr_t   status = -1;
-    jbyte   *byteP;
+    jshort  *buffP;
     jboolean isCopy;
+    htri_t data_class;
 
     if (buf == NULL) {
-        h5nullArgument( env,"H5Aread:  buf is NULL");
+        h5nullArgument(env, "H5Aread_short:  buf is NULL");
     } /* end if */
+    else if((data_class = H5Tdetect_class(mem_type_id, H5T_VLEN)) < 0) {
+        h5JNIFatalError(env, "H5Aread: H5Tdetect_class() failed");
+    } /* end else if */
+    else  if(data_class == 1) {
+        h5badArgument(env, "H5Aread_short:  buf does not support variable length type");
+    } /* end else if */
     else {
-        byteP = ENVPTR->GetByteArrayElements(ENVPAR buf, &isCopy);
-        if (byteP == NULL) {
-            h5JNIFatalError( env,"H5Aread: buf is not pinned");
+        /* recursive detect any vlen string in type (compound, array ...) */
+        if((data_class = H5Tdetect_variable_str(mem_type_id)) < 0) {
+            h5JNIFatalError(env, "H5Aread_short: H5Tdetect_variable_str() failed");
         } /* end if */
+        else  if(data_class == 1) {
+            h5badArgument(env, "H5Aread_short:  buf does not support variable length type");
+        } /* end else if */
         else {
-            status = H5Aread((hid_t)attr_id, (hid_t)mem_type_id, byteP);
-            if (status < 0) {
-                ENVPTR->ReleaseByteArrayElements(ENVPAR buf, byteP, JNI_ABORT);
-                h5libraryError(env);
+            PIN_SHORT_ARRAY();
+            if (buffP == NULL) {
+                h5JNIFatalError(env, "H5Aread_short:  buf not pinned");
             } /* end if */
-            else  {
-                ENVPTR->ReleaseByteArrayElements(ENVPAR buf, byteP, 0);
+            else {
+                status = H5Aread((hid_t)attr_id, (hid_t)mem_type_id, buffP);
+
+                if (status < 0) {
+                    UNPIN_SHORT_ARRAY(JNI_ABORT);
+                    h5libraryError(env);
+                } /* end if */
+                else {
+                    UNPIN_SHORT_ARRAY(0);
+                } /* end else */
             } /* end else */
         } /* end else */
     } /* end else */
 
     return (jint)status;
-} /* end Java_hdf_hdf5lib_H5_H5Aread */
+} /* end Java_hdf_hdf5lib_H5_H5Aread_1short */
 
 /*
  * Class:     hdf_hdf5lib_H5
- * Method:    H5AwriteVL
- * Signature: (JJ[Ljava/lang/String;)I
+ * Method:    H5Awrite_short
+ * Signature: (JJ[SZ)I
  */
 JNIEXPORT jint JNICALL
-Java_hdf_hdf5lib_H5_H5AwriteVL
-    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jobjectArray buf)
+Java_hdf_hdf5lib_H5_H5Awrite_1short
+    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jshortArray buf, jboolean isCriticalPinning)
 {
-    herr_t  status = -1;
-    htri_t  isStr = 0;
-    htri_t  isVlenStr = 0;
-    htri_t  isComplex = 0;
+    herr_t   status = -1;
+    jshort  *buffP;
+    jboolean isCopy;
+    htri_t data_class;
+
+    if (buf == NULL ) {
+        h5nullArgument(env, "H5Awrite_short:  buf is NULL");
+    } /* end if */
+    else if((data_class = H5Tdetect_class(mem_type_id, H5T_VLEN)) < 0) {
+        h5JNIFatalError(env, "H5Awrite_short: H5Tdetect_class() failed");
+    } /* end else if */
+    else  if(data_class == 1) {
+        h5badArgument(env, "H5Awrite_short:  buf does not support variable length type");
+    } /* end else if */
+    else {
+        /* recursive detect any vlen string in type (compound, array ...) */
+        if((data_class = H5Tdetect_variable_str(mem_type_id)) < 0) {
+            h5JNIFatalError(env, "H5Awrite_short: H5Tdetect_variable_str() failed");
+        } /* end if */
+        else  if(data_class == 1) {
+            h5badArgument(env, "H5Awrite_short:  buf does not support variable length type");
+        } /* end else if */
+        else {
+            PIN_SHORT_ARRAY();
+            if (buffP == NULL) {
+                h5JNIFatalError(env, "H5Awrite_short:  buf not pinned");
+            } /* end if */
+            else {
+                status = H5Awrite((hid_t)attr_id, (hid_t)mem_type_id, buffP);
+
+                UNPIN_SHORT_ARRAY(JNI_ABORT);
+
+                if (status < 0)
+                    h5libraryError(env);
+            } /* end else */
+        } /* end else */
+    } /* end else */
+
+    return (jint)status;
+} /* end Java_hdf_hdf5lib_H5_H5Awrite_1short */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Aread_int
+ * Signature: (JJ[IZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Aread_1int
+    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jintArray buf, jboolean isCriticalPinning)
+{
+    herr_t   status = -1;
+    jint    *buffP;
+    jboolean isCopy;
+    htri_t data_class;
 
     if (buf == NULL) {
-        h5nullArgument(env, "H5AwriteVL:  buf is NULL");
+        h5nullArgument(env, "H5Aread_int:  buf is NULL");
     } /* end if */
+    else if((data_class = H5Tdetect_class(mem_type_id, H5T_VLEN)) < 0) {
+        h5JNIFatalError(env, "H5Aread_int: H5Tdetect_class() failed");
+    } /* end else if */
+    else  if(data_class == 1) {
+        h5badArgument(env, "H5Aread_int:  buf does not support variable length type");
+    } /* end else if */
     else {
-        isStr = H5Tdetect_class((hid_t)mem_type_id, H5T_STRING);
-        if (H5Tget_class((hid_t)mem_type_id) == H5T_COMPOUND) {
-            unsigned i;
-            int nm = H5Tget_nmembers(mem_type_id);
-            for(i = 0; i <nm; i++) {
-                hid_t nested_tid = H5Tget_member_type((hid_t)mem_type_id, i);
-                isComplex = H5Tdetect_class((hid_t)nested_tid, H5T_COMPOUND) ||
-                            H5Tdetect_class((hid_t)nested_tid, H5T_VLEN);
-                H5Tclose(nested_tid);
-            }
-        }
-        else if (H5Tget_class((hid_t)mem_type_id) == H5T_VLEN) {
-            isVlenStr = 1; /* strings created by H5Tvlen_create(H5T_C_S1) */
-        }
-        if (isStr == 0 || isComplex>0 || isVlenStr) {
-            status = H5AwriteVL_asstr(env, (hid_t)attr_id, (hid_t)mem_type_id, buf);
-        }
-        else if (isStr > 0) {
-            status = H5AwriteVL_str(env, (hid_t)attr_id, (hid_t)mem_type_id, buf);
-        }
+        /* recursive detect any vlen string in type (compound, array ...) */
+        if((data_class = H5Tdetect_variable_str(mem_type_id)) < 0) {
+            h5JNIFatalError(env, "H5Aread_int: H5Tdetect_variable_str() failed");
+        } /* end if */
+        else  if(data_class == 1) {
+            h5badArgument(env, "H5Aread_int:  buf does not support variable length type");
+        } /* end else if */
+        else {
+            PIN_INT_ARRAY();
+            if (buffP == NULL) {
+                h5JNIFatalError(env, "H5Aread_int:  buf not pinned");
+            } /* end if */
+            else {
+                status = H5Aread((hid_t)attr_id, (hid_t)mem_type_id, buffP);
+
+                if (status < 0) {
+                    UNPIN_INT_ARRAY(JNI_ABORT);
+                    h5libraryError(env);
+                } /* end if */
+                else {
+                    UNPIN_INT_ARRAY(0);
+                } /* end else */
+            } /* end else */
+        } /* end else */
     } /* end else */
 
     return (jint)status;
-} /* end Java_hdf_hdf5lib_H5_H5Awrite_1VL */
+} /* end Java_hdf_hdf5lib_H5_H5Aread_1int */
 
-herr_t
-H5AwriteVL_str
-    (JNIEnv *env, hid_t aid, hid_t tid, jobjectArray buf)
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Awrite_int
+ * Signature: (JJ[IZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Awrite_1int
+    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jintArray buf, jboolean isCriticalPinning)
 {
-    herr_t  status = -1;
-    char  **wdata;
-    jsize   size;
-    jint    i;
+    herr_t   status = -1;
+    jint    *buffP;
+    jboolean isCopy;
+    htri_t data_class;
 
-    size = ENVPTR->GetArrayLength(ENVPAR (jarray) buf);
+    if (buf == NULL) {
+        h5nullArgument(env, "H5Awrite_int:  buf is NULL");
+    } /* end if */
+    else if((data_class = H5Tdetect_class(mem_type_id, H5T_VLEN)) < 0) {
+        h5JNIFatalError(env, "H5Awrite_int: H5Tdetect_class() failed");
+    } /* end else if */
+    else  if(data_class == 1) {
+        h5badArgument(env, "H5Awrite_int:  buf does not support variable length type");
+    } /* end else if */
+    else {
+        /* recursive detect any vlen string in type (compound, array ...) */
+        if((data_class = H5Tdetect_variable_str(mem_type_id)) < 0) {
+            h5JNIFatalError(env, "H5Awrite_int: H5Tdetect_variable_str() failed");
+        } /* end if */
+        else  if(data_class == 1) {
+            h5badArgument(env, "H5Awrite_int:  buf does not support variable length type");
+        } /* end else if */
+        else {
+            PIN_INT_ARRAY();
+            if (buffP == NULL) {
+                h5JNIFatalError(env, "H5Awrite_int:  buf not pinned");
+            } /* end if */
+            else {
+                status = H5Awrite((hid_t)attr_id, (hid_t)mem_type_id, buffP);
 
-    wdata = (char**)HDcalloc((size_t)size + 1, sizeof(char*));
-    if (!wdata) {
-        h5JNIFatalError(env, "H5AwriteVL_str:  cannot allocate buffer");
+                UNPIN_INT_ARRAY(JNI_ABORT);
+
+                if (status < 0)
+                    h5libraryError(env);
+            } /* end else */
+        } /* end else */
+    } /* end else */
+
+    return (jint)status;
+} /* end Java_hdf_hdf5lib_H5_H5Awrite_1int */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Aread_long
+ * Signature: (JJ[JZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Aread_1long
+    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jlongArray buf, jboolean isCriticalPinning)
+{
+    herr_t   status = -1;
+    jlong   *buffP;
+    jboolean isCopy;
+    htri_t data_class;
+
+    if (buf == NULL) {
+        h5nullArgument(env, "H5Aread_long:  buf is NULL");
     } /* end if */
+    else if((data_class = H5Tdetect_class(mem_type_id, H5T_VLEN)) < 0) {
+        h5JNIFatalError(env, "H5Aread_long: H5Tdetect_class() failed");
+    } /* end else if */
+    else  if(data_class == 1) {
+        h5badArgument(env, "H5Aread_long:  buf does not support variable length type");
+    } /* end else if */
     else {
-        HDmemset(wdata, 0, (size_t)size * sizeof(char*));
-        for (i = 0; i < size; ++i) {
-            jstring obj = (jstring) ENVPTR->GetObjectArrayElement(ENVPAR (jobjectArray) buf, i);
-            if (obj != 0) {
-                jsize length = ENVPTR->GetStringUTFLength(ENVPAR obj);
-                const char *utf8 = ENVPTR->GetStringUTFChars(ENVPAR obj, 0);
+        /* recursive detect any vlen string in type (compound, array ...) */
+        if((data_class = H5Tdetect_variable_str(mem_type_id)) < 0) {
+            h5JNIFatalError(env, "H5Aread_long: H5Tdetect_variable_str() failed");
+        } /* end if */
+        else  if(data_class == 1) {
+            h5badArgument(env, "H5Aread_long:  buf does not support variable length type");
+        } /* end else if */
+        else {
+            PIN_LONG_ARRAY();
+            if (buffP == NULL) {
+                h5JNIFatalError(env, "H5Aread_long:  buf not pinned");
+            } /* end if */
+            else {
+                status = H5Aread((hid_t)attr_id, (hid_t)mem_type_id, buffP);
 
-                if (utf8) {
-                    wdata[i] = (char*)HDmalloc((size_t)length + 1);
-                    if (wdata[i]) {
-                        HDmemset(wdata[i], 0, ((size_t)length + 1));
-                        HDstrncpy(wdata[i], utf8, (size_t)length);
-                    } /* end if */
+                if (status < 0) {
+                    UNPIN_LONG_ARRAY(JNI_ABORT);
+                    h5libraryError(env);
                 } /* end if */
+                else {
+                    UNPIN_LONG_ARRAY(0);
+                } /* end else */
+            } /* end else */
+        } /* end else */
+    } /* end else */
 
-                ENVPTR->ReleaseStringUTFChars(ENVPAR obj, utf8);
-                ENVPTR->DeleteLocalRef(ENVPAR obj);
+    return (jint)status;
+} /* end Java_hdf_hdf5lib_H5_H5Aread_1long */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Awrite_long
+ * Signature: (JJ[JZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Awrite_1long
+    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jlongArray buf, jboolean isCriticalPinning)
+{
+    herr_t   status = -1;
+    jlong   *buffP;
+    jboolean isCopy;
+    htri_t data_class;
+
+    if (buf == NULL) {
+        h5nullArgument(env, "H5Awrite_long:  buf is NULL");
+    } /* end if */
+    else if((data_class = H5Tdetect_class(mem_type_id, H5T_VLEN)) < 0) {
+        h5JNIFatalError(env, "H5Dwrite_long: H5Tdetect_class() failed");
+    } /* end else if */
+    else  if(data_class == 1) {
+        h5badArgument(env, "H5Awrite_long:  buf does not support variable length type");
+    } /* end else if */
+    else {
+        /* recursive detect any vlen string in type (compound, array ...) */
+        if((data_class = H5Tdetect_variable_str(mem_type_id)) < 0) {
+            h5JNIFatalError(env, "H5Awrite_long: H5Tdetect_variable_str() failed");
+        } /* end if */
+        else  if(data_class == 1) {
+            h5badArgument(env, "H5Awrite_long:  buf does not support variable length type");
+        } /* end else if */
+        else {
+            PIN_LONG_ARRAY();
+            if (buffP == NULL) {
+                h5JNIFatalError(env, "H5Awrite_long:  buf not pinned");
             } /* end if */
-        } /* end for (i = 0; i < size; ++i) */
+            else {
+                status = H5Awrite((hid_t)attr_id, (hid_t)mem_type_id, buffP);
 
-        status = H5Awrite((hid_t)aid, (hid_t)tid, wdata);
+                UNPIN_LONG_ARRAY(JNI_ABORT);
+                if (status < 0)
+                    h5libraryError(env);
+            } /* end else */
+        } /* end else */
+    } /* end else */
 
-        for (i = 0; i < size; i++) {
-            if(wdata[i]) {
-                HDfree(wdata[i]);
+    return (jint)status;
+} /* end Java_hdf_hdf5lib_H5_H5Awrite_1long */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Aread_float
+ * Signature: (JJ[FZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Aread_1float
+    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jfloatArray buf, jboolean isCriticalPinning)
+{
+    herr_t   status = -1;
+    jfloat  *buffP;
+    jboolean isCopy;
+    htri_t data_class;
+
+    if (buf == NULL) {
+        h5nullArgument(env, "H5Aread_float:  buf is NULL");
+    } /* end if */
+    else if((data_class = H5Tdetect_class(mem_type_id, H5T_VLEN)) < 0) {
+        h5JNIFatalError(env, "H5Dread_float: H5Tdetect_class() failed");
+    } /* end else if */
+    else  if(data_class == 1) {
+        h5badArgument(env, "H5Aread_float:  buf does not support variable length type");
+    } /* end else if */
+    else {
+        /* recursive detect any vlen string in type (compound, array ...) */
+        if((data_class = H5Tdetect_variable_str(mem_type_id)) < 0) {
+            h5JNIFatalError(env, "H5Aread_float: H5Tdetect_variable_str() failed");
+        } /* end if */
+        else  if(data_class == 1) {
+            h5badArgument(env, "H5Aread_float:  buf does not support variable length type");
+        } /* end else if */
+        else {
+            PIN_FLOAT_ARRAY();
+            if (buffP == NULL) {
+                h5JNIFatalError(env, "H5Aread_float:  buf not pinned");
             } /* end if */
-        } /* end for */
-        HDfree(wdata);
+            else {
+                status = H5Aread((hid_t)attr_id, (hid_t)mem_type_id, buffP);
 
-        if (status < 0)
-            h5libraryError(env);
+                if (status < 0) {
+                    UNPIN_FLOAT_ARRAY(JNI_ABORT);
+                    h5libraryError(env);
+                } /* end if */
+                else {
+                    UNPIN_FLOAT_ARRAY(0);
+                } /* end else */
+            } /* end else */
+        } /* end else */
     } /* end else */
 
     return (jint)status;
-}
+} /* end Java_hdf_hdf5lib_H5_H5Aread_1float */
 
-herr_t
-H5AwriteVL_asstr
-    (JNIEnv *env, hid_t aid, hid_t tid, jobjectArray buf)
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Awrite_float
+ * Signature: (JJ[FZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Awrite_1float
+    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jfloatArray buf, jboolean isCriticalPinning)
 {
-    char  **strs;
-    jstring jstr;
-    jint    i;
-    jint    n;
-    hid_t   sid;
-    hsize_t dims[H5S_MAX_RANK];
-    herr_t  status = -1;
+    herr_t   status = -1;
+    jfloat  *buffP;
+    jboolean isCopy;
+    htri_t data_class;
 
-    n = ENVPTR->GetArrayLength(ENVPAR buf);
-    strs =(hvl_t*)HDcalloc((size_t)n, sizeof(hvl_t));
+    if (buf == NULL) {
+        h5nullArgument(env, "H5Awrite_float:  buf is NULL");
+    } /* end if */
+    else if((data_class = H5Tdetect_class(mem_type_id, H5T_VLEN)) < 0) {
+        h5JNIFatalError(env, "H5Awrite_float: H5Tdetect_class() failed");
+    } /* end else if */
+    else  if(data_class == 1) {
+        h5badArgument(env, "H5Awrite_float:  buf does not support variable length type");
+    } /* end else if */
+    else {
+        /* recursive detect any vlen string in type (compound, array ...) */
+        if((data_class = H5Tdetect_variable_str(mem_type_id)) < 0) {
+            h5JNIFatalError(env, "H5Awrite_float: H5Tdetect_variable_str() failed");
+        } /* end if */
+        else  if(data_class == 1) {
+            h5badArgument(env, "H5Awrite_float:  buf does not support variable length type");
+        } /* end else if */
+        else {
+            PIN_FLOAT_ARRAY();
+            if (buffP == NULL) {
+                h5JNIFatalError(env, "H5Awrite_float:  buf not pinned");
+            } /* end if */
+            else {
+                status = H5Awrite((hid_t)attr_id, (hid_t)mem_type_id, buffP);
 
-    if (strs == NULL) {
-        h5JNIFatalError(env, "H5AwriteVL_asstr:  failed to allocate buff for read variable length strings");
+                UNPIN_FLOAT_ARRAY(JNI_ABORT);
+                if (status < 0)
+                    h5libraryError(env);
+            } /* end else */
+        } /* end else */
+    } /* end else */
+
+    return (jint)status;
+} /* end Java_hdf_hdf5lib_H5_H5Awrite_1float */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Aread_double
+ * Signature: (JJ[DZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Aread_1double
+    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jdoubleArray buf, jboolean isCriticalPinning)
+{
+    herr_t   status = -1;
+    jdouble *buffP;
+    jboolean isCopy;
+    htri_t data_class;
+
+    if (buf == NULL) {
+        h5nullArgument(env, "H5Aread_double:  buf is NULL");
     } /* end if */
+    else if((data_class = H5Tdetect_class(mem_type_id, H5T_VLEN)) < 0) {
+        h5JNIFatalError(env, "H5Aread_double: H5Tdetect_class() failed");
+    } /* end else if */
+    else  if(data_class == 1) {
+        h5badArgument(env, "H5Aread_double:  buf does not support variable length type");
+    } /* end else if */
     else {
-        status = H5Awrite(aid, tid, strs);
+        /* recursive detect any vlen string in type (compound, array ...) */
+        if((data_class = H5Tdetect_variable_str(mem_type_id)) < 0) {
+            h5JNIFatalError(env, "H5Aread_double: H5Tdetect_variable_str() failed");
+        } /* end if */
+        else  if(data_class == 1) {
+            h5badArgument(env, "H5Aread_double:  buf does not support variable length type");
+        } /* end else if */
+        else {
+            PIN_DOUBLE_ARRAY();
+            if (buffP == NULL) {
+                h5JNIFatalError(env, "H5Aread_double:  buf not pinned");
+            } /* end if */
+            else {
+                status = H5Aread((hid_t)attr_id, (hid_t)mem_type_id, buffP);
 
-        if (status < 0) {
-            dims[0] = (hsize_t)n;
-            sid = H5Screate_simple(1, dims, NULL);
-            H5Dvlen_reclaim(tid, sid, H5P_DEFAULT, strs);
-            H5Sclose(sid);
-            HDfree(strs);
-            h5JNIFatalError(env, "H5AwriteVL_str: failed to read variable length strings");
+                if (status < 0) {
+                    UNPIN_DOUBLE_ARRAY(JNI_ABORT);
+                    h5libraryError(env);
+                } /* end if */
+                else {
+                    UNPIN_DOUBLE_ARRAY(0);
+                } /* end else */
+            } /* end else */
+        } /* end else */
+    } /* end else */
+
+    return (jint)status;
+} /* end Java_hdf_hdf5lib_H5_H5Aread_1double */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Awrite_double
+ * Signature: (JJ[DZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Awrite_1double
+    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jdoubleArray buf, jboolean isCriticalPinning)
+{
+    herr_t   status = -1;
+    jdouble *buffP;
+    jboolean isCopy;
+    htri_t data_class;
+
+    if (buf == NULL) {
+        h5nullArgument(env, "H5Awrite_double:  buf is NULL");
+    } /* end if */
+    else if((data_class = H5Tdetect_class(mem_type_id, H5T_VLEN)) < 0) {
+        h5JNIFatalError(env, "H5Awrite_double: H5Tdetect_class() failed");
+    } /* end else if */
+    else  if(data_class == 1) {
+        h5badArgument(env, "H5Awrite_double:  buf does not support variable length type");
+    } /* end else if */
+    else {
+        /* recursive detect any vlen string in type (compound, array ...) */
+        if((data_class = H5Tdetect_variable_str(mem_type_id)) < 0) {
+            h5JNIFatalError(env, "H5Awrite_double: H5Tdetect_variable_str() failed");
         } /* end if */
+        else  if(data_class == 1) {
+            h5badArgument(env, "H5Awrite_double:  buf does not support variable length type");
+        } /* end else if */
         else {
-            for (i=0; i < n; i++) {
-                jstr = ENVPTR->NewStringUTF(ENVPAR strs[i]);
-                ENVPTR->SetObjectArrayElement(ENVPAR buf, i, jstr);
-                H5free_memory (strs[i]);
+            PIN_DOUBLE_ARRAY();
+            if (buffP == NULL) {
+                h5JNIFatalError(env, "H5Awrite_double:  buf not pinned");
+            } /* end if */
+            else {
+                status = H5Awrite((hid_t)attr_id, (hid_t)mem_type_id, buffP);
+
+                UNPIN_DOUBLE_ARRAY(JNI_ABORT);
+                if (status < 0)
+                    h5libraryError(env);
+            } /* end else */
+        } /* end else */
+    } /* end else */
+
+    return (jint)status;
+} /* end Java_hdf_hdf5lib_H5_H5Awrite_1double */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Aread_string
+ * Signature: (JJ[Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Aread_1string
+    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jobjectArray j_buf)
+{
+    herr_t  status = -1;
+    char   *c_buf;
+    char   *cstr;
+    size_t  str_len;
+    jsize   i;
+    jsize   n;
+    size_t  pos;
+    jstring jstr;
+
+    c_buf = cstr = NULL;
+    if (j_buf == NULL) {
+        h5nullArgument(env, "H5Aread_string:  buf is NULL");
+    } /* end if */
+    else if ((n = ENVPTR->GetArrayLength(ENVPAR j_buf)) <= 0) {
+        h5nullArgument(env, "H5Aread_string:  buf length <= 0");
+    } /* end else if */
+    else if ((str_len = H5Tget_size((hid_t)mem_type_id)) <=0) {
+        h5libraryError(env);
+    } /* end else if */
+    else {
+        if ((cstr = (char*)HDmalloc(str_len + 1)) == NULL) {
+            h5JNIFatalError(env, "H5Aread_string: memory allocation failed.");
+        } /* end if */
+        else {
+            if ((c_buf = (char*)HDmalloc((size_t)n * str_len)) == NULL) {
+                if (cstr)
+                    HDfree(cstr);
+                cstr = NULL;
+                h5JNIFatalError(env, "H5Aread_string: memory allocation failed.");
+            } /* end if */
+            else {
+                status = H5Aread((hid_t)attr_id, (hid_t)mem_type_id, c_buf);
+
+                if (status < 0) {
+                    if (cstr)
+                        HDfree(cstr);
+                    cstr = NULL;
+                    if (c_buf)
+                        HDfree(c_buf);
+                    c_buf = NULL;
+                    h5libraryError(env);
+                } /* end if */
+                else {
+                    pos = 0;
+                    for (i = 0; i < n; i++) {
+                        HDmemcpy(cstr, c_buf+pos, str_len);
+                        cstr[str_len] = '\0';
+                        jstr = ENVPTR->NewStringUTF(ENVPAR cstr);
+                        ENVPTR->SetObjectArrayElement(ENVPAR j_buf, i, jstr);
+                        pos += str_len;
+                    } /* end for */
+                } /* end else */
+
+                if (c_buf)
+                    HDfree(c_buf);
+            } /* end else cbuf allocation*/
+
+            if (cstr)
+                HDfree(cstr);
+        } /* end else cstr allocation*/
+    } /* end else */
+
+    return (jint)status;
+} /* end Java_hdf_hdf5lib_H5_H5Aread_1string */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Awrite_string
+ * Signature: (JJ[Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Awrite_1string
+    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jobjectArray j_buf)
+{
+    herr_t  status = -1;
+    char   *c_buf;
+    jsize   str_len;
+    jsize   i;
+    jsize   n;
+
+    if (j_buf == NULL) {
+        h5nullArgument(env, "H5Awrite_string:  buf is NULL");
+    } /* end if */
+    else if ((n = ENVPTR->GetArrayLength(ENVPAR j_buf)) <= 0) {
+        h5nullArgument(env, "H5Awrite_string:  buf length <= 0");
+    } /* end else if */
+    else if ((str_len = (jsize)H5Tget_size((hid_t)mem_type_id)) <=0) {
+        h5libraryError(env);
+    } /* end else if */
+    else {
+        if ((c_buf = (char*)HDmalloc((size_t)n * (size_t)str_len)) == NULL) {
+            h5JNIFatalError(env, "H5Awrite_string: memory allocation failed.");
+        } /* end if */
+        else {
+            for (i = 0; i < n; i++) {
+                jstring obj = (jstring)ENVPTR->GetObjectArrayElement(ENVPAR (jobjectArray)j_buf, i);
+                if (obj != 0) {
+                    jsize length = ENVPTR->GetStringUTFLength(ENVPAR obj);
+                    const char *utf8 = ENVPTR->GetStringUTFChars(ENVPAR obj, 0);
+
+                    if (utf8) {
+                        HDstrncpy(&c_buf[i * str_len], utf8, str_len);
+                    } /* end if */
+
+                    ENVPTR->ReleaseStringUTFChars(ENVPAR obj, utf8);
+                    ENVPTR->DeleteLocalRef(ENVPAR obj);
+                } /* end if */
             } /* end for */
 
-            /*
-            for repeatedly reading a dataset with a large number of strs (e.g., 1,000,000 strings,
-            H5Dvlen_reclaim() may crash on Windows because the Java GC will not be able to collect
-            free space in time. Instead, use "H5free_memory(strs[i])" above to free individual strings
-            after it is done.
-            H5Dvlen_reclaim(tid, mem_sid, xfer_plist_id, strs);
-            */
+            status = H5Awrite((hid_t)attr_id, (hid_t)mem_type_id, c_buf);
 
-            HDfree(strs);
+            if (c_buf)
+                HDfree(c_buf);
+            c_buf = NULL;
+
+            if (status < 0) {
+                h5libraryError(env);
+            } /* end if */
         } /* end else */
     } /* end else */
 
-    return status;
-} /* end H5AwriteVL_str */
+    return (jint)status;
+} /* end Java_hdf_hdf5lib_H5_H5Awrite_1string */
 
 /*
  * Class:     hdf_hdf5lib_H5
  * Method:    H5AreadVL
- * Signature: (JJJJJ[Ljava/lang/String;)I
+ * Signature: (JJ[Ljava/lang/String;)I
  */
 JNIEXPORT jint JNICALL
 Java_hdf_hdf5lib_H5_H5AreadVL
@@ -519,6 +1163,206 @@ H5AreadVL_str
 
 /*
  * Class:     hdf_hdf5lib_H5
+ * Method:    H5AwriteVL
+ * Signature: (JJ[Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5AwriteVL
+    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jobjectArray buf)
+{
+    herr_t  status = -1;
+    htri_t  isStr = 0;
+    htri_t  isVlenStr = 0;
+    htri_t  isComplex = 0;
+
+    if (buf == NULL) {
+        h5nullArgument(env, "H5AwriteVL:  buf is NULL");
+    } /* end if */
+    else {
+        isStr = H5Tdetect_class((hid_t)mem_type_id, H5T_STRING);
+        if (H5Tget_class((hid_t)mem_type_id) == H5T_COMPOUND) {
+            unsigned i;
+            int nm = H5Tget_nmembers(mem_type_id);
+            for(i = 0; i <nm; i++) {
+                hid_t nested_tid = H5Tget_member_type((hid_t)mem_type_id, i);
+                isComplex = H5Tdetect_class((hid_t)nested_tid, H5T_COMPOUND) ||
+                            H5Tdetect_class((hid_t)nested_tid, H5T_VLEN);
+                H5Tclose(nested_tid);
+            }
+        }
+        else if (H5Tget_class((hid_t)mem_type_id) == H5T_VLEN) {
+            isVlenStr = 1; /* strings created by H5Tvlen_create(H5T_C_S1) */
+        }
+        if (isStr == 0 || isComplex>0 || isVlenStr) {
+            status = H5AwriteVL_asstr(env, (hid_t)attr_id, (hid_t)mem_type_id, buf);
+        }
+        else if (isStr > 0) {
+            status = H5AwriteVL_str(env, (hid_t)attr_id, (hid_t)mem_type_id, buf);
+        }
+    } /* end else */
+
+    return (jint)status;
+} /* end Java_hdf_hdf5lib_H5_H5Awrite_1VL */
+
+herr_t
+H5AwriteVL_str
+    (JNIEnv *env, hid_t aid, hid_t tid, jobjectArray buf)
+{
+    herr_t  status = -1;
+    char  **wdata;
+    jsize   size;
+    jint    i;
+
+    size = ENVPTR->GetArrayLength(ENVPAR (jarray) buf);
+
+    wdata = (char**)HDcalloc((size_t)size + 1, sizeof(char*));
+    if (!wdata) {
+        h5JNIFatalError(env, "H5AwriteVL_str:  cannot allocate buffer");
+    } /* end if */
+    else {
+        HDmemset(wdata, 0, (size_t)size * sizeof(char*));
+        for (i = 0; i < size; ++i) {
+            jstring obj = (jstring) ENVPTR->GetObjectArrayElement(ENVPAR (jobjectArray) buf, i);
+            if (obj != 0) {
+                jsize length = ENVPTR->GetStringUTFLength(ENVPAR obj);
+                const char *utf8 = ENVPTR->GetStringUTFChars(ENVPAR obj, 0);
+
+                if (utf8) {
+                    wdata[i] = (char*)HDmalloc((size_t)length + 1);
+                    if (wdata[i]) {
+                        HDmemset(wdata[i], 0, ((size_t)length + 1));
+                        HDstrncpy(wdata[i], utf8, (size_t)length);
+                    } /* end if */
+                } /* end if */
+
+                ENVPTR->ReleaseStringUTFChars(ENVPAR obj, utf8);
+                ENVPTR->DeleteLocalRef(ENVPAR obj);
+            } /* end if */
+        } /* end for (i = 0; i < size; ++i) */
+
+        status = H5Awrite((hid_t)aid, (hid_t)tid, wdata);
+
+        for (i = 0; i < size; i++) {
+            if(wdata[i]) {
+                HDfree(wdata[i]);
+            } /* end if */
+        } /* end for */
+        HDfree(wdata);
+
+        if (status < 0)
+            h5libraryError(env);
+    } /* end else */
+
+    return (jint)status;
+}
+
+herr_t
+H5AwriteVL_asstr
+    (JNIEnv *env, hid_t aid, hid_t tid, jobjectArray buf)
+{
+    char  **strs;
+    jstring jstr;
+    jint    i;
+    jint    n;
+    hid_t   sid;
+    hsize_t dims[H5S_MAX_RANK];
+    herr_t  status = -1;
+
+    n = ENVPTR->GetArrayLength(ENVPAR buf);
+    strs =(hvl_t*)HDcalloc((size_t)n, sizeof(hvl_t));
+
+    if (strs == NULL) {
+        h5JNIFatalError(env, "H5AwriteVL_asstr:  failed to allocate buff for read variable length strings");
+    } /* end if */
+    else {
+        status = H5Awrite(aid, tid, strs);
+
+        if (status < 0) {
+            dims[0] = (hsize_t)n;
+            sid = H5Screate_simple(1, dims, NULL);
+            H5Dvlen_reclaim(tid, sid, H5P_DEFAULT, strs);
+            H5Sclose(sid);
+            HDfree(strs);
+            h5JNIFatalError(env, "H5AwriteVL_str: failed to read variable length strings");
+        } /* end if */
+        else {
+            for (i=0; i < n; i++) {
+                jstr = ENVPTR->NewStringUTF(ENVPAR strs[i]);
+                ENVPTR->SetObjectArrayElement(ENVPAR buf, i, jstr);
+                H5free_memory (strs[i]);
+            } /* end for */
+
+            /*
+            for repeatedly reading a dataset with a large number of strs (e.g., 1,000,000 strings,
+            H5Dvlen_reclaim() may crash on Windows because the Java GC will not be able to collect
+            free space in time. Instead, use "H5free_memory(strs[i])" above to free individual strings
+            after it is done.
+            H5Dvlen_reclaim(tid, mem_sid, xfer_plist_id, strs);
+            */
+
+            HDfree(strs);
+        } /* end else */
+    } /* end else */
+
+    return status;
+} /* end H5AwriteVL_str */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Aread_reg_ref
+ * Signature: (JJ[Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Aread_1reg_1ref
+    (JNIEnv *env, jclass clss, jlong attr_id, jlong mem_type_id, jobjectArray buf)
+{
+    herr_t    status = -1;
+    h5str_t   h5str;
+    size_t    size;
+    hdset_reg_ref_t *ref_data;
+    jint      i;
+    jint      n;
+    jstring   jstr;
+
+    hid_t region = -1;
+    hid_t aid = (hid_t) attr_id;
+    hid_t tid = (hid_t) mem_type_id;
+
+    n = ENVPTR->GetArrayLength(ENVPAR buf);
+    size = sizeof(hdset_reg_ref_t); /*H5Tget_size(tid);*/
+    ref_data = (hdset_reg_ref_t*)HDmalloc(size * (size_t)n);
+
+    if (ref_data == NULL) {
+        h5JNIFatalError(env, "H5Aread_reg_ref:  failed to allocate buff for read");
+        return -1;
+    } /* end if */
+
+    status = H5Aread(aid, tid, ref_data);
+
+    if (status < 0) {
+        HDfree(ref_data);
+        h5JNIFatalError(env, "H5Aread_reg_ref: failed to read data");
+        return -1;
+    } /* end if */
+
+    HDmemset(&h5str, 0, sizeof(h5str_t));
+    h5str_new(&h5str, 1024);
+    for (i=0; i<n; i++) {
+        h5str.s[0] = '\0';
+        h5str_sprintf(&h5str, aid, tid, ref_data[i], 0, 0);
+        jstr = ENVPTR->NewStringUTF(ENVPAR h5str.s);
+
+        ENVPTR->SetObjectArrayElement(ENVPAR buf, i, jstr);
+    } /* end for */
+
+    h5str_free(&h5str);
+    HDfree(ref_data);
+
+    return (jint)status;
+} /* end Java_hdf_hdf5lib_H5_H5Aread_1reg_1ref */
+
+/*
+ * Class:     hdf_hdf5lib_H5
  * Method:    H5Aget_space
  * Signature: (J)J
  */
diff --git a/java/src/jni/h5aImp.h b/java/src/jni/h5aImp.h
index f3758eb..15cc83e 100644
--- a/java/src/jni/h5aImp.h
+++ b/java/src/jni/h5aImp.h
@@ -51,21 +51,120 @@ Java_hdf_hdf5lib_H5__1H5Aopen_1idx
 
 /*
  * Class:     hdf_hdf5lib_H5
+ * Method:    H5Aread
+ * Signature: (JJ[B)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Aread
+  (JNIEnv *, jclass, jlong, jlong, jbyteArray, jboolean);
+
+/*
+ * Class:     hdf_hdf5lib_H5
  * Method:    H5Awrite
  * Signature: (JJ[B)I
  */
 JNIEXPORT jint JNICALL
 Java_hdf_hdf5lib_H5_H5Awrite
-  (JNIEnv *, jclass, jlong, jlong, jbyteArray);
+  (JNIEnv *, jclass, jlong, jlong, jbyteArray, jboolean);
 
 /*
  * Class:     hdf_hdf5lib_H5
- * Method:    H5Aread
- * Signature: (JJ[B)I
+ * Method:    H5Aread_short
+ * Signature: (JJ[SZ)I
  */
 JNIEXPORT jint JNICALL
-Java_hdf_hdf5lib_H5_H5Aread
-  (JNIEnv *, jclass, jlong, jlong, jbyteArray);
+Java_hdf_hdf5lib_H5_H5Aread_1short
+  (JNIEnv*, jclass, jlong, jlong, jshortArray, jboolean);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Awrite_short
+ * Signature: (JJ[SZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Awrite_1short
+  (JNIEnv*, jclass, jlong, jlong, jshortArray, jboolean);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Aread_int
+ * Signature: (JJ[IZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Aread_1int
+  (JNIEnv*, jclass, jlong, jlong, jintArray, jboolean);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Awrite_int
+ * Signature: (JJ[IZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Awrite_1int
+  (JNIEnv*, jclass, jlong, jlong, jintArray, jboolean);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Aread_long
+ * Signature: (JJ[JZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Aread_1long
+  (JNIEnv*, jclass, jlong, jlong, jlongArray, jboolean);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Awrite_long
+ * Signature: (JJ[JZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Awrite_1long
+  (JNIEnv*, jclass, jlong, jlong, jlongArray, jboolean);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Aread_float
+ * Signature: (JJ[FZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Aread_1float
+  (JNIEnv*, jclass, jlong, jlong, jfloatArray, jboolean);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Awrite_float
+ * Signature: (JJ[FZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Awrite_1float
+  (JNIEnv*, jclass, jlong, jlong, jfloatArray, jboolean);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Aread_double
+ * Signature: (JJ[DZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Aread_1double
+  (JNIEnv*, jclass, jlong, jlong, jdoubleArray, jboolean);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Awrite_double
+ * Signature: (JJ[DZ)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Awrite_1double
+  (JNIEnv*, jclass, jlong, jlong, jdoubleArray, jboolean);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5AreadVL
+ * Signature: (JJ[Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5AreadVL
+  (JNIEnv *, jclass, jlong, jlong, jobjectArray);
 
 /*
  * Class:     hdf_hdf5lib_H5
@@ -78,12 +177,48 @@ Java_hdf_hdf5lib_H5_H5AwriteVL
 
 /*
  * Class:     hdf_hdf5lib_H5
- * Method:    H5AreadVL
+ * Method:    H5Aread_string
  * Signature: (JJ[Ljava/lang/String;)I
  */
 JNIEXPORT jint JNICALL
-Java_hdf_hdf5lib_H5_H5AreadVL
-  (JNIEnv *, jclass, jlong, jlong, jobjectArray);
+Java_hdf_hdf5lib_H5_H5Aread_1string
+  (JNIEnv*, jclass, jlong, jlong, jobjectArray);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Awrite_string
+ * Signature: (JJ[Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Awrite_1string
+(JNIEnv*, jclass, jlong, jlong, jobjectArray);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Aread_VLStrings
+ * Signature: (JJ[Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Aread_1VLStrings
+(JNIEnv*, jclass, jlong, jlong, jobjectArray);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Awrite_VLStrings
+ * Signature: (JJ[B)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Awrite_1VLStrings
+  (JNIEnv*, jclass, jlong, jlong, jobjectArray);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Aread_reg_ref
+ * Signature: (JJ[Ljava/lang/String;)I
+ */
+JNIEXPORT jint JNICALL
+Java_hdf_hdf5lib_H5_H5Aread_1reg_1ref
+(JNIEnv*, jclass, jlong, jlong, jobjectArray);
 
 /*
  * Class:     hdf_hdf5lib_H5
diff --git a/java/src/jni/h5dImp.c b/java/src/jni/h5dImp.c
index 652c873..79a5d0a 100644
--- a/java/src/jni/h5dImp.c
+++ b/java/src/jni/h5dImp.c
@@ -1574,84 +1574,6 @@ Java_hdf_hdf5lib_H5_H5Dread_1reg_1ref
 
 /*
  * Class:     hdf_hdf5lib_H5
- * Method:    H5Dread_reg_ref_data
- * Signature: (JJJJJ[Ljava/lang/String;)I
- */
-JNIEXPORT jint JNICALL
-Java_hdf_hdf5lib_H5_H5Dread_1reg_1ref_1data
-    (JNIEnv *env, jclass clss,
-        jlong dataset_id, jlong mem_type_id, jlong mem_space_id,
-        jlong file_space_id, jlong xfer_plist_id, jobjectArray buf)
-{
-    herr_t    status = -1;
-    h5str_t   h5str;
-    size_t    size;
-    hdset_reg_ref_t *ref_data;
-    jint      i;
-    jint      n;
-    jstring   jstr;
-
-    hid_t        region_obj;
-    H5S_sel_type region_type;
-
-    hid_t region = -1;
-    hid_t did = (hid_t) dataset_id;
-    hid_t tid = (hid_t) mem_type_id;
-    hid_t mem_sid = (hid_t) mem_space_id;
-    hid_t file_sid = (hid_t) file_space_id;
-
-    n = ENVPTR->GetArrayLength(ENVPAR buf);
-    size = sizeof(hdset_reg_ref_t); /*H5Tget_size(tid);*/
-    ref_data = (hdset_reg_ref_t*)HDmalloc(size * (size_t)n);
-
-    if (ref_data == NULL) {
-        h5JNIFatalError(env, "H5Dread_reg_ref_data:  failed to allocate buff for read");
-        return -1;
-    } /* end if */
-
-    status = H5Dread(did, tid, mem_sid, file_sid, xfer_plist_id, ref_data);
-
-    if (status < 0) {
-        HDfree(ref_data);
-        h5JNIFatalError(env, "H5Dread_reg_ref_data: failed to read data");
-        return -1;
-    } /* end if */
-
-    HDmemset(&h5str, 0, sizeof(h5str_t));
-    h5str_new(&h5str, 1024);
-    for (i=0; i<n; i++) {
-        h5str.s[0] = '\0';
-
-        /* get name of the dataset the region reference points to using H5Rget_name */
-        region_obj = H5Rdereference2(did, H5P_DEFAULT, H5R_DATASET_REGION, ref_data[i]);
-        if (region_obj >= 0) {
-            region = H5Rget_region(did, H5R_DATASET_REGION, ref_data[i]);
-            if (region >= 0) {
-                region_type = H5Sget_select_type(region);
-                if(region_type==H5S_SEL_POINTS) {
-                    h5str_dump_region_points_data(&h5str, region, region_obj);
-                } /* end if */
-                else {
-                    h5str_dump_region_blocks_data(&h5str, region, region_obj);
-                } /* end else */
-
-                H5Sclose(region);
-            } /* end if */
-            H5Dclose(region_obj);
-        } /* end if */
-        jstr = ENVPTR->NewStringUTF(ENVPAR h5str.s);
-
-        ENVPTR->SetObjectArrayElement(ENVPAR buf, i, jstr);
-    } /* end for */
-
-    h5str_free(&h5str);
-    HDfree(ref_data);
-
-    return (jint)status;
-} /* end Java_hdf_hdf5lib_H5_H5Dread_1reg_1ref_1data */
-
-/*
- * Class:     hdf_hdf5lib_H5
  * Method:    _H5Dcreate2
  * Signature: (JLjava/lang/String;JJJJJ)J
  */
diff --git a/java/src/jni/h5dImp.h b/java/src/jni/h5dImp.h
index 1fe71a8..f824452 100644
--- a/java/src/jni/h5dImp.h
+++ b/java/src/jni/h5dImp.h
@@ -250,7 +250,7 @@ Java_hdf_hdf5lib_H5_H5Dread_1VLStrings
 /*
  * Class:     hdf_hdf5lib_H5
  * Method:    H5Dwrite_VLStrings
- * Signature: (JJJJJ[BZ)I
+ * Signature: (JJJJJ[B)I
  */
 JNIEXPORT jint JNICALL
 Java_hdf_hdf5lib_H5_H5Dwrite_1VLStrings
@@ -267,15 +267,6 @@ Java_hdf_hdf5lib_H5_H5Dread_1reg_1ref
 
 /*
  * Class:     hdf_hdf5lib_H5
- * Method:    H5Dread_reg_ref_data
- * Signature: (JJJJJ[Ljava/lang/String;)I
- */
-JNIEXPORT jint JNICALL
-Java_hdf_hdf5lib_H5_H5Dread_1reg_1ref_1data
-  (JNIEnv*, jclass, jlong, jlong, jlong, jlong, jlong, jobjectArray);
-
-/*
- * Class:     hdf_hdf5lib_H5
  * Method:    _H5Dcreate2
  * Signature: (JLjava/lang/String;JJJJJ)J
  */
diff --git a/java/src/jni/h5fImp.c b/java/src/jni/h5fImp.c
index 9d68290..80adffb 100644
--- a/java/src/jni/h5fImp.c
+++ b/java/src/jni/h5fImp.c
@@ -149,6 +149,9 @@ Java_hdf_hdf5lib_H5_H5Fis_1hdf5
     (JNIEnv *env, jclass clss, jstring name)
 {
     htri_t      bval = JNI_FALSE;
+#ifdef H5_NO_DEPRECATED_SYMBOLS
+    h5unimplemented(env, "H5Fis_hdf5:  not implemented");
+#else
     const char *fileName;
 
     PIN_JAVA_STRING(name, fileName);
@@ -162,12 +165,39 @@ Java_hdf_hdf5lib_H5_H5Fis_1hdf5
         else if (bval < 0)
             h5libraryError(env);
     }
-
+#endif
     return (jboolean)bval;
 } /* end Java_hdf_hdf5lib_H5_H5Fis_1hdf5 */
 
 /*
  * Class:     hdf_hdf5lib_H5
+ * Method:    H5Fis_accessible
+ * Signature: (Ljava/lang/String;J)Z
+ */
+JNIEXPORT jboolean JNICALL
+Java_hdf_hdf5lib_H5_H5Fis_1accessible
+    (JNIEnv *env, jclass clss, jstring name, jlong file_id)
+{
+    htri_t      bval = JNI_FALSE;
+    const char *fileName;
+
+    PIN_JAVA_STRING(name, fileName);
+    if (fileName != NULL) {
+        bval = H5Fis_accessible(fileName, (hid_t)file_id);
+
+        UNPIN_JAVA_STRING(name, fileName);
+
+        if (bval > 0)
+            bval = JNI_TRUE;
+        else if (bval < 0)
+            h5libraryError(env);
+    }
+
+    return (jboolean)bval;
+} /* end Java_hdf_hdf5lib_H5_H5Fis_1accessible */
+
+/*
+ * Class:     hdf_hdf5lib_H5
  * Method:    H5Fget_create_plist
  * Signature: (J)J
  */
@@ -177,7 +207,7 @@ Java_hdf_hdf5lib_H5__1H5Fget_1create_1plist
 {
     hid_t retVal = -1;
 
-    retVal =  H5Fget_create_plist((hid_t)file_id );
+    retVal =  H5Fget_create_plist((hid_t)file_id);
     if (retVal < 0)
         h5libraryError(env);
 
@@ -609,6 +639,66 @@ Java_hdf_hdf5lib_H5_H5Fget_1mdc_1logging_1status
     } /* end else */
 } /* end Java_hdf_hdf5lib_H5_H5Fget_1mdc_1logging_1status */
 
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Fset_dset_no_attrs_hint
+ * Signature: (JZ)V
+ */
+JNIEXPORT void JNICALL
+Java_hdf_hdf5lib_H5_H5Fset_1dset_1no_1attrs_1hint
+(JNIEnv *env, jclass clss, jlong file_id, jboolean minimize)
+{
+    herr_t   retVal = -1;
+    hbool_t  minimize_val;
+
+    if (minimize == JNI_TRUE)
+        minimize_val = TRUE;
+    else
+        minimize_val = FALSE;
+
+    retVal = H5Fset_dset_no_attrs_hint((hid_t)file_id, (hbool_t)minimize_val);
+    if (retVal < 0)
+        h5libraryError(env);
+}
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Fget_dset_no_attrs_hint
+ * Signature: (J)Z
+ */
+JNIEXPORT jboolean JNICALL
+Java_hdf_hdf5lib_H5_H5Fget_1dset_1no_1attrs_1hint
+(JNIEnv *env, jclass clss, jlong file_id)
+{
+    hbool_t    minimize = FALSE;
+    jboolean  bval = JNI_FALSE;
+
+    if (H5Fget_dset_no_attrs_hint((hid_t)file_id, (hbool_t *)&minimize) < 0) {
+        h5libraryError(env);
+    }
+    else {
+        if (minimize == TRUE)
+            bval =  JNI_TRUE;
+    } /* end else */
+
+    return bval;
+}
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Fset_libver_bounds
+ * Signature: (JII)V
+ */
+JNIEXPORT void JNICALL
+Java_hdf_hdf5lib_H5_H5Fset_1libver_1bounds
+    (JNIEnv *env, jclass clss, jlong file_id, jint low, jint high)
+{
+    herr_t retVal = -1;
+
+    retVal = H5Fset_libver_bounds((hid_t)file_id, (H5F_libver_t)low, (H5F_libver_t)high);
+    if(retVal < 0)
+        h5libraryError(env);
+} /* end Java_hdf_hdf5lib_H5_H5Fset_1libver_1bounds */
 
 
 #ifdef __cplusplus
diff --git a/java/src/jni/h5fImp.h b/java/src/jni/h5fImp.h
index fcfdedf..fe253f9 100644
--- a/java/src/jni/h5fImp.h
+++ b/java/src/jni/h5fImp.h
@@ -68,6 +68,15 @@ Java_hdf_hdf5lib_H5_H5Fis_1hdf5
 
 /*
  * Class:     hdf_hdf5lib_H5
+ * Method:    H5Fis_accessible
+ * Signature: (Ljava/lang/String;J)Z
+ */
+JNIEXPORT jboolean JNICALL
+Java_hdf_hdf5lib_H5_H5Fis_1ccessible
+  (JNIEnv*, jclass, jstring, jlong);
+
+/*
+ * Class:     hdf_hdf5lib_H5
  * Method:    H5Fget_create_plist
  * Signature: (J)J
  */
@@ -246,6 +255,33 @@ JNIEXPORT void JNICALL
 Java_hdf_hdf5lib_H5_H5Fget_1mdc_1logging_1status
   (JNIEnv *, jclass, jlong, jbooleanArray);
 
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Fset_dset_no_attrs_hint
+ * Signature: (JZ)V
+ */
+JNIEXPORT void JNICALL
+Java_hdf_hdf5lib_H5_H5Fset_1dset_1no_1attrs_1hint
+  (JNIEnv *, jclass, jlong, jboolean);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Fget_dset_no_attrs_hint
+ * Signature: (J)Z
+ */
+JNIEXPORT jboolean JNICALL
+Java_hdf_hdf5lib_H5_H5Fget_1dset_1no_1attrs_1hint
+  (JNIEnv *, jclass, jlong);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Fset_libver_bounds
+ * Signature: (JII)V
+ */
+JNIEXPORT void JNICALL
+Java_hdf_hdf5lib_H5_H5Fset_1libver_1bounds
+(JNIEnv *, jclass, jlong, jint, jint);
+
 #ifdef __cplusplus
 } /* end extern "C" */
 #endif /* __cplusplus */
diff --git a/java/src/jni/h5pImp.c b/java/src/jni/h5pImp.c
index 52008ce..ac21d1d 100644
--- a/java/src/jni/h5pImp.c
+++ b/java/src/jni/h5pImp.c
@@ -134,45 +134,6 @@ Java_hdf_hdf5lib_H5__1H5Pcopy
 
 /*
  * Class:     hdf_hdf5lib_H5
- * Method:    H5Pget_version
- * Signature: (J[I)I
- */
-JNIEXPORT jint JNICALL
-Java_hdf_hdf5lib_H5_H5Pget_1version
-    (JNIEnv *env, jclass clss, jlong plist, jintArray version_info)
-{
-    herr_t   status = -1;
-    jint    *theArray;
-    jboolean isCopy;
-
-    if (version_info == NULL) {
-        h5nullArgument(env, "H5Pget_version:  version_info input array is NULL");
-    } /* end if */
-    else if (ENVPTR->GetArrayLength(ENVPAR version_info) < 4) {
-        h5badArgument(env, "H5Pget_version:  version_info input array < 4");
-    } /* end else if */
-    else {
-        theArray = (jint *)ENVPTR->GetIntArrayElements(ENVPAR version_info, &isCopy);
-        if (theArray == NULL) {
-            h5JNIFatalError(env, "H5Pget_version:  version_info not pinned");
-        } /* end if */
-        else {
-            status = H5Pget_version((hid_t)plist, (unsigned *)&(theArray[0]),
-                    (unsigned *)&(theArray[1]), (unsigned *)&(theArray[2]), (unsigned *)&(theArray[3]));
-            if (status < 0) {
-                ENVPTR->ReleaseIntArrayElements(ENVPAR version_info, theArray, JNI_ABORT);
-                h5libraryError(env);
-            } /* end if */
-            else
-                ENVPTR->ReleaseIntArrayElements(ENVPAR version_info, theArray, 0);
-        } /* end else */
-    } /* end else */
-
-    return (jint)status;
-} /* end Java_hdf_hdf5lib_H5_H5Pget_1version */
-
-/*
- * Class:     hdf_hdf5lib_H5
  * Method:    H5Pset_userblock
  * Signature: (JJ)I
  */
@@ -5946,6 +5907,51 @@ Java_hdf_hdf5lib_H5_H5Pget_1chunk_1opts
     return (jint)opts;
 } /* end Java_hdf_hdf5lib_H5_H5Pget_1chunk_1opts */
 
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Pset_dset_no_attrs_hint
+ * Signature: (JZ)V
+ */
+JNIEXPORT void JNICALL
+Java_hdf_hdf5lib_H5_H5Pset_1dset_1no_1attrs_1hint
+(JNIEnv *env, jclass clss, jlong dcpl_id, jboolean minimize)
+{
+    herr_t   retVal = -1;
+    hbool_t  minimize_val;
+
+    if (minimize == JNI_TRUE)
+        minimize_val = TRUE;
+    else
+        minimize_val = FALSE;
+
+    retVal = H5Pset_dset_no_attrs_hint((hid_t)dcpl_id, (hbool_t)minimize_val);
+    if (retVal < 0)
+        h5libraryError(env);
+}
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Pget_dset_no_attrs_hint
+ * Signature: (J)Z
+ */
+JNIEXPORT jboolean JNICALL
+Java_hdf_hdf5lib_H5_H5Pget_1dset_1no_1attrs_1hint
+(JNIEnv *env, jclass clss, jlong dcpl_id)
+{
+    hbool_t    minimize = FALSE;
+    jboolean  bval = JNI_FALSE;
+
+    if (H5Pget_dset_no_attrs_hint((hid_t)dcpl_id, (hbool_t *)&minimize) < 0) {
+        h5libraryError(env);
+    }
+    else {
+        if (minimize == TRUE)
+            bval =  JNI_TRUE;
+    } /* end else */
+
+    return bval;
+}
+
 #ifdef __cplusplus
 } /* end extern "C" */
 #endif /* __cplusplus */
diff --git a/java/src/jni/h5pImp.h b/java/src/jni/h5pImp.h
index 1d12e3d..056c569 100644
--- a/java/src/jni/h5pImp.h
+++ b/java/src/jni/h5pImp.h
@@ -59,15 +59,6 @@ Java_hdf_hdf5lib_H5__1H5Pcopy
 
 /*
  * Class:     hdf_hdf5lib_H5
- * Method:    H5Pget_version
- * Signature: (J[I)I
- */
-JNIEXPORT jint JNICALL
-Java_hdf_hdf5lib_H5_H5Pget_1version
-(JNIEnv *, jclass, jlong, jintArray);
-
-/*
- * Class:     hdf_hdf5lib_H5
  * Method:    H5Pset_userblock
  * Signature: (JJ)I
  */
@@ -1614,6 +1605,24 @@ JNIEXPORT jint JNICALL
 Java_hdf_hdf5lib_H5_H5Pget_1chunk_1opts
 (JNIEnv *, jclass, jlong);
 
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Pset_dset_no_attrs_hint
+ * Signature: (JZ)V
+ */
+JNIEXPORT void JNICALL
+Java_hdf_hdf5lib_H5_H5Pset_1dset_1no_1attrs_1hint
+  (JNIEnv *, jclass, jlong, jboolean);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5Pget_dset_no_attrs_hint
+ * Signature: (J)Z
+ */
+JNIEXPORT jboolean JNICALL
+Java_hdf_hdf5lib_H5_H5Pget_1dset_1no_1attrs_1hint
+  (JNIEnv *, jclass, jlong);
+
 
 #ifdef __cplusplus
 } /* end extern "C" */
diff --git a/java/src/jni/h5vlImp.c b/java/src/jni/h5vlImp.c
new file mode 100644
index 0000000..89ea703
--- /dev/null
+++ b/java/src/jni/h5vlImp.c
@@ -0,0 +1,206 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ *  For details of the HDF libraries, see the HDF Documentation at:
+ *    http://hdfgroup.org/HDF5/doc/
+ *
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#include "hdf5.h"
+#include <jni.h>
+#include <stdlib.h>
+#include "h5jni.h"
+#include "h5vlImp.h"
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLregister_connector_by_name
+ * Signature: (Ljava/lang/String;J)J
+ */
+JNIEXPORT jlong JNICALL
+Java_hdf_hdf5lib_H5_H5VLregister_1connector_1by_1name
+  (JNIEnv *env, jclass clss, jobject connector_name, jlong vipl_id)
+{
+    hid_t       status = -1;
+    const char *vlName;
+
+    PIN_JAVA_STRING(connector_name, vlName);
+    if (vlName != NULL) {
+        status = H5VLregister_connector_by_name(vlName, (hid_t)vipl_id);
+
+        UNPIN_JAVA_STRING(connector_name, vlName);
+
+        if (status < 0)
+            h5libraryError(env);
+    }
+
+    return (jlong)status;
+} /* end Java_hdf_hdf5lib_H5_H5VLregister_1connector_1by_1name */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLregister_connector_by_value
+ * Signature: (IJ)J
+ */
+JNIEXPORT jlong JNICALL
+Java_hdf_hdf5lib_H5_H5VLregister_1connector_1by_1value
+  (JNIEnv *env, jclass clss, jint connector_value, jlong vipl_id)
+{
+    hid_t status = H5VLregister_connector_by_value((H5VL_class_value_t)connector_value, (hid_t)vipl_id);
+
+    if (status < 0)
+        h5libraryError(env);
+
+    return (jlong)status;
+} /* end Java_hdf_hdf5lib_H5_H5VLregister_1connector_1by_1value */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLis_connector_registered
+ * Signature: (Ljava/lang/String;)Z
+ */
+JNIEXPORT jboolean JNICALL
+Java_hdf_hdf5lib_H5_H5VLis_1connector_1registered
+  (JNIEnv *env, jclass clss, jobject connector_name)
+{
+    htri_t      bval = JNI_FALSE;
+    const char *vlName;
+
+    PIN_JAVA_STRING(connector_name, vlName);
+    if (vlName != NULL) {
+        bval = H5VLis_connector_registered(vlName);
+
+        UNPIN_JAVA_STRING(connector_name, vlName);
+
+        if (bval > 0)
+            bval = JNI_TRUE;
+        else if (bval < 0)
+            h5libraryError(env);
+    }
+
+    return (jboolean)bval;
+} /* end Java_hdf_hdf5lib_H5_H5VLis_1connector_1registered */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLget_connector_id
+ * Signature: (Ljava/lang/String;)J
+ */
+JNIEXPORT jlong JNICALL
+Java_hdf_hdf5lib_H5_H5VLget_1connector_1id
+  (JNIEnv *env, jclass clss, jobject connector_name)
+{
+    hid_t       status = -1;
+    const char *vlName;
+
+    PIN_JAVA_STRING(connector_name, vlName);
+    if (vlName != NULL) {
+        status = H5VLget_connector_id(vlName);
+
+        UNPIN_JAVA_STRING(connector_name, vlName);
+
+        if (status < 0)
+            h5libraryError(env);
+    }
+
+    return (jlong)status;
+} /* end Java_hdf_hdf5lib_H5_H5VLget_1connector_1id */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLget_connector_name
+ * Signature: (J)Ljava/lang/String;
+ */
+
+JNIEXPORT jobject JNICALL
+Java_hdf_hdf5lib_H5_H5VLget_1connector_1name
+  (JNIEnv *env, jclass clss, jlong object_id)
+{
+    char    *vlName;
+    ssize_t  buf_size;
+    ssize_t  status;
+    jstring  str = NULL;
+
+    /* get the length of the comment */
+    buf_size = H5VLget_connector_name((hid_t)object_id, NULL, 0);
+    if (buf_size < 0) {
+        H5Eprint2(H5E_DEFAULT, NULL);
+
+        h5badArgument(env, "H5VLget_connector_name:  buf_size < 0");
+    } /* end if */
+    else if (buf_size > 0) {
+        buf_size++; /* add extra space for the null terminator */
+        vlName = (char *)HDmalloc(sizeof(char) * (size_t)buf_size);
+        if (vlName == NULL) {
+            /* exception -- out of memory */
+            h5outOfMemory(env, "H5VLget_connector_name:  malloc failed");
+        } /* end if */
+        else {
+            status = H5VLget_connector_name((hid_t)object_id, vlName, (size_t)buf_size);
+
+            if (status < 0) {
+                h5libraryError(env);
+            } /* end if */
+            else {
+                /*  may throw OutOfMemoryError */
+                str = ENVPTR->NewStringUTF(ENVPAR vlName);
+                if (str == NULL) {
+                    h5JNIFatalError(env, "H5VLget_connector_name:  return string not allocated");
+                } /* end if */
+            } /* end else */
+            HDfree(vlName);
+        }
+    } /* end else if */
+
+    return (jstring)str;
+} /* end Java_hdf_hdf5lib_H5_H5VLget_1connector_1name */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLclose
+ * Signature: (J)V
+ */
+JNIEXPORT void JNICALL
+Java_hdf_hdf5lib_H5_H5VLclose
+  (JNIEnv *env, jclass clss, jlong connector_id)
+{
+    herr_t retValue = H5VLclose((hid_t)connector_id);
+
+    if (retValue < 0)
+        h5libraryError(env);
+} /* end Java_hdf_hdf5lib_H5_H5VLclose */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLunregister_connector
+ * Signature: (J)V
+ */
+JNIEXPORT void JNICALL
+Java_hdf_hdf5lib_H5_H5VLunregister_1connector
+    (JNIEnv *env, jclass clss, jlong connector_id)
+{
+    herr_t retValue = H5VLunregister_connector((hid_t)connector_id);
+
+    if (retValue < 0)
+        h5libraryError(env);
+} /* end Java_hdf_hdf5lib_H5_H5VLunregister_1connector */
+
+
+#ifdef __cplusplus
+} /* end extern "C" */
+#endif /* __cplusplus */
diff --git a/java/src/jni/h5vlImp.h b/java/src/jni/h5vlImp.h
new file mode 100644
index 0000000..af824a9
--- /dev/null
+++ b/java/src/jni/h5vlImp.h
@@ -0,0 +1,91 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#include <jni.h>
+/* Header for class hdf_hdf5lib_H5_H5VL */
+
+#ifndef _Included_hdf_hdf5lib_H5_H5VL
+#define _Included_hdf_hdf5lib_H5_H5VL
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLregister_connector_by_name
+ * Signature: (Ljava/lang/String;J)J
+ */
+JNIEXPORT jlong JNICALL
+Java_hdf_hdf5lib_H5_H5VLregister_1connector_1by_1name
+  (JNIEnv *, jclass, jobject, jlong);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLregister_connector_by_value
+ * Signature: (IJ)J
+ */
+JNIEXPORT jlong JNICALL
+Java_hdf_hdf5lib_H5_H5VLregister_1connector_1by_1value
+  (JNIEnv *, jclass, jint, jlong);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLis_connector_registered
+ * Signature: (Ljava/lang/String;)Z
+ */
+JNIEXPORT jboolean JNICALL
+Java_hdf_hdf5lib_H5_H5VLis_connector_registered
+  (JNIEnv *, jclass, jobject);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLget_connector_id
+ * Signature: (Ljava/lang/String;)J
+ */
+JNIEXPORT jlong JNICALL
+Java_hdf_hdf5lib_H5_H5VLget_1connector_1id
+  (JNIEnv *, jclass, jobject);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLget_connector_name
+ * Signature: (J)Ljava/lang/String;
+ */
+
+JNIEXPORT jobject JNICALL
+Java_hdf_hdf5lib_H5_H5VLget_1connector_1name
+  (JNIEnv *, jclass, jlong);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLclose
+ * Signature: (J)V
+ */
+JNIEXPORT void JNICALL
+Java_hdf_hdf5lib_H5_H5VLclose
+  (JNIEnv *, jclass, jlong);
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLunregister_connector
+ * Signature: (J)V
+ */
+JNIEXPORT void JNICALL
+Java_hdf_hdf5lib_H5_H5VLunregister_1connector
+  (JNIEnv *, jclass, jlong);
+
+#ifdef __cplusplus
+} /* end extern "C" */
+#endif /* __cplusplus */
+
+#endif /* _Included_hdf_hdf5lib_H5_H5VL */
diff --git a/java/test/CMakeLists.txt b/java/test/CMakeLists.txt
index b76f572..937b129 100644
--- a/java/test/CMakeLists.txt
+++ b/java/test/CMakeLists.txt
@@ -38,6 +38,7 @@ set (HDF5_JAVA_TEST_SOURCES
     TestH5Ocreate
     TestH5Ocopy
     TestH5PL
+    TestH5VL
     TestH5Z
 )
 
diff --git a/java/test/Makefile.am b/java/test/Makefile.am
index 6635ef7..af99d92 100644
--- a/java/test/Makefile.am
+++ b/java/test/Makefile.am
@@ -69,6 +69,7 @@ noinst_JAVA = \
     TestH5Ocreate.java \
     TestH5Ocopy.java \
     TestH5PL.java \
+    TestH5VL.java \
     TestH5Z.java \
     TestH5E.java \
     TestH5Edefault.java \
diff --git a/java/test/TestH5Dplist.java b/java/test/TestH5Dplist.java
index 406a1d3..1b5acfa 100644
--- a/java/test/TestH5Dplist.java
+++ b/java/test/TestH5Dplist.java
@@ -13,6 +13,7 @@
 
 package test;
 
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
@@ -211,4 +212,23 @@ public class TestH5Dplist {
       assertTrue("testH5Dset_extent - H5.H5Dread: ", extend_dset_data[4][8] == 99);
   }
 
+  @Test
+  public void testH5P_dset_no_attrs_hint() {
+      boolean ret_val_id = true;
+
+      _createPDataset(H5fid, H5dsid, "dset", HDF5Constants.H5P_DATASET_CREATE);
+
+      try {
+          ret_val_id = H5.H5Pget_dset_no_attrs_hint(H5dcpl_id);
+          assertFalse("H5P_dset_no_attrs_hint", ret_val_id);
+          H5.H5Pset_dset_no_attrs_hint(H5dcpl_id, true);
+          ret_val_id = H5.H5Pget_dset_no_attrs_hint(H5dcpl_id);
+          assertTrue("H5P_dset_no_attrs_hint", ret_val_id);
+      }
+      catch (Throwable err) {
+          err.printStackTrace();
+          fail("H5P_dset_no_attrs_hint: " + err);
+      }
+  }
+
 }
diff --git a/java/test/TestH5Fbasic.java b/java/test/TestH5Fbasic.java
index 11d6644..72a3c23 100644
--- a/java/test/TestH5Fbasic.java
+++ b/java/test/TestH5Fbasic.java
@@ -14,6 +14,7 @@
 package test;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
@@ -69,14 +70,14 @@ public class TestH5Fbasic {
     }
 
     @Test
-    public void testH5Fis_hdf5() {
+    public void testH5Fis_accessible() {
         boolean isH5 = false;
 
         try {
-            isH5 = H5.H5Fis_hdf5(H5_FILE);
+            isH5 = H5.H5Fis_accessible(H5_FILE, HDF5Constants.H5P_DEFAULT);
         }
         catch (Throwable err) {
-            fail("H5.H5Fis_hdf5 failed on " + H5_FILE + ": " + err);
+            fail("H5.H5Fis_accessible failed on " + H5_FILE + ": " + err);
         }
         assertTrue(isH5 == true);
     }
@@ -315,4 +316,20 @@ public class TestH5Fbasic {
             fail("H5.H5Freset_mdc_hit_rate_stats: " + err);
         }
     }
+
+    @Test
+    public void testH5F_dset_no_attrs_hint() {
+        boolean ret_val_id = true;
+        try {
+            ret_val_id = H5.H5Fget_dset_no_attrs_hint(H5fid);
+            assertFalse("H5F_dset_no_attrs_hint", ret_val_id);
+            H5.H5Fset_dset_no_attrs_hint(H5fid, true);
+            ret_val_id = H5.H5Fget_dset_no_attrs_hint(H5fid);
+            assertTrue("H5F_dset_no_attrs_hint", ret_val_id);
+        }
+        catch (Throwable err) {
+            err.printStackTrace();
+            fail("H5F_dset_no_attrs_hint: " + err);
+        }
+    }
 }
diff --git a/java/test/TestH5Fparams.java b/java/test/TestH5Fparams.java
index fffded1..40cbe4b 100644
--- a/java/test/TestH5Fparams.java
+++ b/java/test/TestH5Fparams.java
@@ -22,10 +22,12 @@ import java.io.File;
 
 import hdf.hdf5lib.H5;
 import hdf.hdf5lib.HDF5Constants;
+import hdf.hdf5lib.exceptions.HDF5FunctionArgumentException;
 import hdf.hdf5lib.structs.H5F_info2_t;
 
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Ignore;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.TestName;
@@ -55,8 +57,8 @@ public class TestH5Fparams {
     }
 
     @Test(expected = NullPointerException.class)
-    public void testH5Fis_hdf5_null() throws Throwable {
-        H5.H5Fis_hdf5(null);
+    public void testH5Fis_accessible_null() throws Throwable {
+        H5.H5Fis_accessible(null, -1);
     }
 
     @Test(expected = NullPointerException.class)
@@ -69,7 +71,7 @@ public class TestH5Fparams {
         H5.H5Funmount(-1, null);
     }
 
-    @Test
+    @Ignore
     public void testH5Fis_hdf5_text() {
         File txtFile = null;
         boolean isH5 = false;
@@ -190,7 +192,7 @@ public class TestH5Fparams {
                         HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
             }
             catch (Throwable err) {
-                fail("H5.H5Fopen: " + err);
+                fail("H5.H5Fcreate: " + err);
             }
 
             try {
@@ -210,4 +212,42 @@ public class TestH5Fparams {
             try {H5.H5Fclose(fid);} catch (Exception ex) {}
         }
     }
+
+    @Ignore//(expected = HDF5FunctionArgumentException.class)
+    public void testH5Fset_libver_bounds_invalidlow() throws Throwable {
+        long fid = -1;
+
+        try {
+            try {
+                fid = H5.H5Fcreate("test.h5", HDF5Constants.H5F_ACC_TRUNC,
+                        HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
+            }
+            catch (Throwable err) {
+                fail("H5.H5Fcreate: " + err);
+            }
+            H5.H5Fset_libver_bounds(fid, 5, HDF5Constants.H5F_LIBVER_LATEST);
+        }
+        finally {
+            try {H5.H5Fclose(fid);} catch (Exception ex) {}
+        }
+    }
+
+    @Ignore//(expected = HDF5FunctionArgumentException.class)
+    public void testH5Fset_libver_bounds_invalidhigh() throws Throwable {
+        long fid = -1;
+
+        try {
+            try {
+                fid = H5.H5Fcreate("test.h5", HDF5Constants.H5F_ACC_TRUNC,
+                        HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
+            }
+            catch (Throwable err) {
+                fail("H5.H5Fcreate: " + err);
+            }
+            H5.H5Fset_libver_bounds(fid, HDF5Constants.H5F_LIBVER_V110, HDF5Constants.H5F_LIBVER_V110+1);
+        }
+        finally {
+            try {H5.H5Fclose(fid);} catch (Exception ex) {}
+        }
+    }
 }
diff --git a/java/test/TestH5P.java b/java/test/TestH5P.java
index e6105d9..981f34e 100644
--- a/java/test/TestH5P.java
+++ b/java/test/TestH5P.java
@@ -25,6 +25,7 @@ import hdf.hdf5lib.HDF5Constants;
 import hdf.hdf5lib.exceptions.HDF5Exception;
 import hdf.hdf5lib.exceptions.HDF5FunctionArgumentException;
 import hdf.hdf5lib.exceptions.HDF5LibraryException;
+import hdf.hdf5lib.structs.H5F_info2_t;
 
 import org.junit.After;
 import org.junit.Before;
@@ -887,37 +888,12 @@ public class TestH5P {
     }
 
     @Test(expected = NullPointerException.class)
-    public void testH5Pget_version_null() throws Throwable {
-        H5.H5Pget_version(fcpl_id, null);
-    }
-
-    @Test
-    public void testH5Pget_version() {
-        int[] version_info = {255,255,255,255};
-
-        try {
-            _createH5File(fcpl_id, fapl_id);
-            H5.H5Pget_version(fcpl_id, version_info);
-            deleteH5file();
-        }
-        catch (Throwable err) {
-            err.printStackTrace();
-            fail("H5Pget_version: " + err);
-        }
-        assertTrue("super block version: "+version_info[0], version_info[0] == 0);
-        assertTrue("global freelist version: "+version_info[1], version_info[1] == 0);
-        assertTrue("symbol table version: "+version_info[2], version_info[2] == 0);
-        assertTrue("shared object header version: "+version_info[3], version_info[3] == 0);
-    }
-
-    @Test(expected = NullPointerException.class)
     public void testH5Pget_userblock_null() throws Throwable {
         H5.H5Pget_userblock(fcpl_id, null);
     }
 
     @Test
     public void testH5P_userblock() {
-        int[] version_info = {255,255,255,255};
         long[] size = {0};
 
         try {
@@ -931,7 +907,10 @@ public class TestH5P {
             fcpl_id =  H5.H5Fget_create_plist(H5fid);
 
             /* Get the file's version information */
-            H5.H5Pget_version(fcpl_id, version_info);
+            H5F_info2_t finfo = H5.H5Fget_info(H5fid);
+            assertTrue("super block version: "+finfo.super_version, finfo.super_version == 0);
+            assertTrue("free-space manager version: "+finfo.free_version, finfo.free_version == 0);
+            assertTrue("shared object header version: "+finfo.sohm_version, finfo.sohm_version == 0);
             H5.H5Pget_userblock(fcpl_id, size);
             deleteH5file();
         }
@@ -939,10 +918,6 @@ public class TestH5P {
             err.printStackTrace();
             fail("H5Pget_userblock: " + err);
         }
-        assertTrue("super block version: "+version_info[0], version_info[0] == 0);
-        assertTrue("global freelist version: "+version_info[1], version_info[1] == 0);
-        assertTrue("symbol table version: "+version_info[2], version_info[2] == 0);
-        assertTrue("shared object header version: "+version_info[3], version_info[3] == 0);
         assertTrue("user block size: "+size[0], size[0] == 1024);
     }
 
@@ -953,7 +928,6 @@ public class TestH5P {
 
     @Test
     public void testH5P_sizes() {
-        int[] version_info = {255,255,255,255};
         long[] size = {0,0};
 
         try {
@@ -967,7 +941,10 @@ public class TestH5P {
             fcpl_id =  H5.H5Fget_create_plist(H5fid);
 
             /* Get the file's version information */
-            H5.H5Pget_version(fcpl_id, version_info);
+            H5F_info2_t finfo = H5.H5Fget_info(H5fid);
+            assertTrue("super block version: "+finfo.super_version, finfo.super_version == 0);
+            assertTrue("free-space manager version: "+finfo.free_version, finfo.free_version == 0);
+            assertTrue("shared object header version: "+finfo.sohm_version, finfo.sohm_version == 0);
             H5.H5Pget_sizes(fcpl_id, size);
             deleteH5file();
         }
@@ -975,10 +952,6 @@ public class TestH5P {
             err.printStackTrace();
             fail("H5Pget_sizes: " + err);
         }
-        assertTrue("super block version: "+version_info[0], version_info[0] == 0);
-        assertTrue("global freelist version: "+version_info[1], version_info[1] == 0);
-        assertTrue("symbol table version: "+version_info[2], version_info[2] == 0);
-        assertTrue("shared object header version: "+version_info[3], version_info[3] == 0);
         assertTrue("sizeof_addr size: "+size[0], size[0] == 4);
         assertTrue("sizeof_size size: "+size[1], size[1] == 8);
     }
@@ -990,7 +963,6 @@ public class TestH5P {
 
     @Test
     public void testH5P_sym_k() {
-        int[] version_info = {255,255,255,255};
         int[] size = {0,0};
 
         try {
@@ -1004,7 +976,10 @@ public class TestH5P {
             fcpl_id =  H5.H5Fget_create_plist(H5fid);
 
             /* Get the file's version information */
-            H5.H5Pget_version(fcpl_id, version_info);
+            H5F_info2_t finfo = H5.H5Fget_info(H5fid);
+            assertTrue("super block version: "+finfo.super_version, finfo.super_version == 0);
+            assertTrue("free-space manager version: "+finfo.free_version, finfo.free_version == 0);
+            assertTrue("shared object header version: "+finfo.sohm_version, finfo.sohm_version == 0);
             H5.H5Pget_sym_k(fcpl_id, size);
             deleteH5file();
         }
@@ -1012,10 +987,6 @@ public class TestH5P {
             err.printStackTrace();
             fail("H5Pget_sym_k: " + err);
         }
-        assertTrue("super block version: "+version_info[0], version_info[0] == 0);
-        assertTrue("global freelist version: "+version_info[1], version_info[1] == 0);
-        assertTrue("symbol table version: "+version_info[2], version_info[2] == 0);
-        assertTrue("shared object header version: "+version_info[3], version_info[3] == 0);
         assertTrue("symbol table tree rank: "+size[0], size[0] == 32);
         assertTrue("symbol table node size: "+size[1], size[1] == 8);
     }
@@ -1027,7 +998,6 @@ public class TestH5P {
 
     @Test
     public void testH5P_istore_k() {
-        int[] version_info = {255,255,255,255};
         int[] size = {0};
 
         try {
@@ -1041,7 +1011,10 @@ public class TestH5P {
             fcpl_id =  H5.H5Fget_create_plist(H5fid);
 
             /* Get the file's version information */
-            H5.H5Pget_version(fcpl_id, version_info);
+            H5F_info2_t finfo = H5.H5Fget_info(H5fid);
+            assertTrue("super block version: "+finfo.super_version, finfo.super_version == 1);
+            assertTrue("free-space manager version: "+finfo.free_version, finfo.free_version == 0);
+            assertTrue("shared object header version: "+finfo.sohm_version, finfo.sohm_version == 0);
             H5.H5Pget_istore_k(fcpl_id, size);
             deleteH5file();
         }
@@ -1049,10 +1022,6 @@ public class TestH5P {
             err.printStackTrace();
             fail("H5Pget_sym_k: " + err);
         }
-        assertTrue("super block version: "+version_info[0], version_info[0] == 1);
-        assertTrue("global freelist version: "+version_info[1], version_info[1] == 0);
-        assertTrue("symbol table version: "+version_info[2], version_info[2] == 0);
-        assertTrue("shared object header version: "+version_info[3], version_info[3] == 0);
         assertTrue("chunked storage b-tree 1/2-rank: "+size[0], size[0] == 64);
     }
 
diff --git a/java/test/TestH5VL.java b/java/test/TestH5VL.java
new file mode 100644
index 0000000..0397be1
--- /dev/null
+++ b/java/test/TestH5VL.java
@@ -0,0 +1,117 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+package test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+import hdf.hdf5lib.H5;
+import hdf.hdf5lib.HDF5Constants;
+import hdf.hdf5lib.exceptions.HDF5LibraryException;
+
+import java.io.File;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TestName;
+
+public class TestH5VL {
+    @Rule public TestName testname = new TestName();
+
+    private final void _deleteFile(String filename) {
+        File file = new File(filename);
+
+        if (file.exists()) {
+            try {file.delete();} catch (SecurityException e) {}
+        }
+    }
+
+    @Before
+    public void checkOpenIDs() {
+        assertTrue("H5 open ids is 0",H5.getOpenIDCount()==0);
+        System.out.print(testname.getMethodName());
+    }
+    @After
+    public void nextTestName() {
+        System.out.println();
+    }
+
+    @Test
+    public void testH5VLnative_init() {
+        try {
+            boolean is_registered;
+
+            is_registered = H5.H5VLis_connector_registered(HDF5Constants.H5VL_NATIVE_NAME);
+            assertTrue("H5.H5VLis_connector_registered H5VL_NATIVE_NAME", is_registered);
+
+            is_registered = H5.H5VLis_connector_registered("FAKE_VOL_NAME");
+            assertFalse("H5.H5VLis_connector_registered FAKE_VOL_NAME", is_registered);
+        }
+        catch (Throwable err) {
+            err.printStackTrace();
+            fail("H5.H5VLis_connector_registered " + err);
+        }
+    }
+
+    @Test
+    public void testH5VLget_connector_id() {
+        try {
+            long native_id = H5.H5VLget_connector_id(HDF5Constants.H5VL_NATIVE_NAME);
+            assertTrue("H5.H5VLget_connector_id H5VL_NATIVE_NAME", native_id >= 0);
+            assertEquals(HDF5Constants.H5VL_NATIVE, native_id);
+        }
+        catch (Throwable err) {
+            err.printStackTrace();
+            fail("H5.H5VLget_connector_id " + err);
+        }
+    }
+
+    @Test
+    public void testH5VLget_connector_name() {
+        String H5_FILE = "testFvl.h5";
+
+        long H5fid = H5.H5Fcreate(H5_FILE, HDF5Constants.H5F_ACC_TRUNC,
+                HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
+        H5.H5Fflush(H5fid, HDF5Constants.H5F_SCOPE_LOCAL);
+
+        try {
+            String native_name = H5.H5VLget_connector_name(H5fid);
+            assertTrue("H5.H5VLget_connector_name H5VL_NATIVE", native_name.compareToIgnoreCase(HDF5Constants.H5VL_NATIVE_NAME)==0);
+        }
+        catch (Throwable err) {
+            err.printStackTrace();
+            fail("H5.H5VLget_connector_name " + err);
+        }
+        finally {
+            if (H5fid > 0) {
+                try {H5.H5Fclose(H5fid);} catch (Exception ex) {}
+            }
+            _deleteFile(H5_FILE);
+        }
+    }
+
+    @Test(expected = HDF5LibraryException.class)
+    public void testH5VLclose_NegativeID() throws Throwable {
+        H5.H5VLclose(-1);
+    }
+
+    @Test(expected = HDF5LibraryException.class)
+    public void testH5VLunregister_connector_NegativeID() throws Throwable {
+        H5.H5VLunregister_connector(-1);
+    }
+}
+
diff --git a/java/test/junit.sh.in b/java/test/junit.sh.in
index 350fb7b..7fb1bae 100644
--- a/java/test/junit.sh.in
+++ b/java/test/junit.sh.in
@@ -101,6 +101,7 @@ $HDFTEST_HOME/testfiles/JUnit-TestH5Obasic.txt
 $HDFTEST_HOME/testfiles/JUnit-TestH5Ocreate.txt
 $HDFTEST_HOME/testfiles/JUnit-TestH5Ocopy.txt
 $HDFTEST_HOME/testfiles/JUnit-TestH5PL.txt
+$HDFTEST_HOME/testfiles/JUnit-TestH5VL.txt
 $HDFTEST_HOME/testfiles/JUnit-TestH5Z.txt
 $HDFTEST_HOME/testfiles/JUnit-TestH5E.txt
 $HDFTEST_HOME/testfiles/JUnit-TestH5Edefault.txt
@@ -324,7 +325,7 @@ TESTING JUnit-TestH5
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5.ext > JUnit-TestH5.out
@@ -345,7 +346,7 @@ TESTING JUnit-TestH5Eparams
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Eparams.ext > JUnit-TestH5Eparams.out
@@ -366,7 +367,7 @@ TESTING JUnit-TestH5Eregister
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Eregister.ext > JUnit-TestH5Eregister.out
@@ -387,7 +388,7 @@ TESTING JUnit-TestH5Fparams
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Fparams.ext > JUnit-TestH5Fparams.out
@@ -408,7 +409,7 @@ TESTING JUnit-TestH5Fbasic
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Fbasic.ext > JUnit-TestH5Fbasic.out
@@ -429,7 +430,7 @@ TESTING JUnit-TestH5F
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5F.ext > JUnit-TestH5F.out
@@ -450,7 +451,7 @@ TESTING JUnit-TestH5Fswmr
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Fswmr.ext > JUnit-TestH5Fswmr.out
@@ -471,7 +472,7 @@ TESTING JUnit-TestH5Gbasic
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Gbasic.ext > JUnit-TestH5Gbasic.out
@@ -492,7 +493,7 @@ TESTING JUnit-TestH5G
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5G.ext > JUnit-TestH5G.out
@@ -513,7 +514,7 @@ TESTING JUnit-TestH5Sbasic
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Sbasic.ext > JUnit-TestH5Sbasic.out
@@ -534,7 +535,7 @@ TESTING JUnit-TestH5S
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5S.ext > JUnit-TestH5S.out
@@ -555,7 +556,7 @@ TESTING JUnit-TestH5Tparams
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Tparams.ext > JUnit-TestH5Tparams.out
@@ -576,7 +577,7 @@ TESTING JUnit-TestH5Tbasic
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Tbasic.ext > JUnit-TestH5Tbasic.out
@@ -597,7 +598,7 @@ TESTING JUnit-TestH5T
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5T.ext > JUnit-TestH5T.out
@@ -618,7 +619,7 @@ TESTING JUnit-TestH5Dparams
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Dparams.ext > JUnit-TestH5Dparams.out
@@ -639,7 +640,7 @@ TESTING JUnit-TestH5D
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5D.ext > JUnit-TestH5D.out
@@ -660,7 +661,7 @@ TESTING JUnit-TestH5Dplist
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Dplist.ext > JUnit-TestH5Dplist.out
@@ -681,7 +682,7 @@ TESTING JUnit-TestH5Lparams
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Lparams.ext > JUnit-TestH5Lparams.out
@@ -702,7 +703,7 @@ TESTING JUnit-TestH5Lbasic
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Lbasic.ext > JUnit-TestH5Lbasic.out
@@ -723,7 +724,7 @@ TESTING JUnit-TestH5Lcreate
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Lcreate.ext > JUnit-TestH5Lcreate.out
@@ -744,7 +745,7 @@ TESTING JUnit-TestH5R
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5R.ext > JUnit-TestH5R.out
@@ -765,7 +766,7 @@ TESTING JUnit-TestH5P
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5P.ext > JUnit-TestH5P.out
@@ -786,7 +787,7 @@ TESTING JUnit-TestH5PData
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5PData.ext > JUnit-TestH5PData.out
@@ -807,7 +808,7 @@ TESTING JUnit-TestH5Pfapl
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Pfapl.ext > JUnit-TestH5Pfapl.out
@@ -828,7 +829,7 @@ TESTING JUnit-TestH5Pvirtual
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Pvirtual.ext > JUnit-TestH5Pvirtual.out
@@ -849,7 +850,7 @@ TESTING JUnit-TestH5Plist
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Plist.ext > JUnit-TestH5Plist.out
@@ -870,7 +871,7 @@ TESTING JUnit-TestH5A
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5A.ext > JUnit-TestH5A.out
@@ -891,7 +892,7 @@ TESTING JUnit-TestH5Oparams
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Oparams.ext > JUnit-TestH5Oparams.out
@@ -912,7 +913,7 @@ TESTING JUnit-TestH5Obasic
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Obasic.ext > JUnit-TestH5Obasic.out
@@ -933,7 +934,7 @@ TESTING JUnit-TestH5Ocreate
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Ocreate.ext > JUnit-TestH5Ocreate.out
@@ -954,7 +955,7 @@ TESTING JUnit-TestH5Ocopy
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Ocopy.ext > JUnit-TestH5Ocopy.out
@@ -975,7 +976,7 @@ TESTING JUnit-TestH5PL
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5PL.ext > JUnit-TestH5PL.out
@@ -989,6 +990,27 @@ else
     test yes = "$verbose" && $DIFF JUnit-TestH5PL.txt JUnit-TestH5PL.out |sed 's/^/    /'
 fi
 
+echo "$JAVAEXE $JAVAEXEFLAGS -Xmx1024M -Dorg.slf4j.simpleLogger.defaultLog=trace -Djava.library.path=$BLDLIBDIR -cp $CLASSPATH -ea org.junit.runner.JUnitCore test.TestH5VL"
+TESTING JUnit-TestH5VL
+($RUNSERIAL $JAVAEXE $JAVAEXEFLAGS -Xmx1024M -Dorg.slf4j.simpleLogger.defaultLog=trace -Djava.library.path=$BLDLIBDIR -cp $CLASSPATH -ea org.junit.runner.JUnitCore test.TestH5VL > JUnit-TestH5VL.ext)
+
+# Extract file name, line number, version and thread IDs because they may be different
+sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
+    -e 's/line [0-9]*/line (number)/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
+    -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
+    -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
+    JUnit-TestH5VL.ext > JUnit-TestH5VL.out
+
+if diff JUnit-TestH5VL.out JUnit-TestH5VL.txt > /dev/null; then
+    echo "  PASSED      JUnit-TestH5VL"
+else
+    echo "**FAILED**    JUnit-TestH5VL"
+    echo "    Expected result differs from actual result"
+    nerrors="`expr $nerrors + 1`"
+    test yes = "$verbose" && $DIFF JUnit-TestH5VL.txt JUnit-TestH5VL.out |sed 's/^/    /'
+fi
+
 echo "$JAVAEXE $JAVAEXEFLAGS -Xmx1024M -Dorg.slf4j.simpleLogger.defaultLog=trace -Djava.library.path=$BLDLIBDIR -cp $CLASSPATH -ea org.junit.runner.JUnitCore test.TestH5Z"
 TESTING JUnit-TestH5Z
 ($RUNSERIAL $JAVAEXE $JAVAEXEFLAGS -Xmx1024M -Dorg.slf4j.simpleLogger.defaultLog=trace -Djava.library.path=$BLDLIBDIR -cp $CLASSPATH -ea org.junit.runner.JUnitCore test.TestH5Z > JUnit-TestH5Z.ext)
@@ -996,7 +1018,7 @@ TESTING JUnit-TestH5Z
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Z.ext > JUnit-TestH5Z.out
@@ -1017,7 +1039,7 @@ TESTING JUnit-TestH5E
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5E.ext > JUnit-TestH5E.out
@@ -1038,7 +1060,7 @@ TESTING JUnit-TestH5Edefault
 # Extract file name, line number, version and thread IDs because they may be different
 sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
     -e 's/line [0-9]*/line (number)/' \
-    -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+    -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
     -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
     -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
     JUnit-TestH5Edefault.ext > JUnit-TestH5Edefault.out
@@ -1060,7 +1082,7 @@ if test $USE_FILTER_SZIP = "yes"; then
     # Extract file name, line number, version and thread IDs because they may be different
     sed -e 's/thread [0-9]*/thread (IDs)/' -e 's/: .*\.c /: (file name) /' \
         -e 's/line [0-9]*/line (number)/' \
-        -e 's/Time: [0-9]*\.[0-9]*/Time:  XXXX/' \
+        -e 's/Time: [0-9]*[\.[0-9]*]*/Time:  XXXX/' \
         -e 's/v[1-9]*\.[0-9]*\./version (number)\./' \
         -e 's/[1-9]*\.[0-9]*\.[0-9]*[^)]*/version (number)/' \
         JUnit-TestH5Giterate.ext > JUnit-TestH5Giterate.out
diff --git a/java/test/testfiles/JUnit-TestH5Dplist.txt b/java/test/testfiles/JUnit-TestH5Dplist.txt
index 1dfbed1..64e924a 100644
--- a/java/test/testfiles/JUnit-TestH5Dplist.txt
+++ b/java/test/testfiles/JUnit-TestH5Dplist.txt
@@ -1,7 +1,8 @@
 JUnit version 4.11
+.testH5P_dset_no_attrs_hint
 .testH5Dset_extent
 
 Time:  XXXX
 
-OK (1 test)
+OK (2 tests)
 
diff --git a/java/test/testfiles/JUnit-TestH5Edefault.txt b/java/test/testfiles/JUnit-TestH5Edefault.txt
index 71d1431..48c6254 100644
--- a/java/test/testfiles/JUnit-TestH5Edefault.txt
+++ b/java/test/testfiles/JUnit-TestH5Edefault.txt
@@ -38,17 +38,20 @@ HDF5-DIAG: Error detected in HDF5 (version (number)) thread (IDs):
     minor: Unable to open file
   #001: (file name) line (number) in H5VL_file_open(): open failed
     major: Virtual Object Layer
-    minor: Unable to initialize object
-  #002: (file name) line (number) in H5VL_native_file_open(): unable to open file
+    minor: Can't open object
+  #002: (file name) line (number) in H5VL__file_open(): open failed
+    major: Virtual Object Layer
+    minor: Can't open object
+  #003: (file name) line (number) in H5VL__native_file_open(): unable to open file
     major: File accessibility
     minor: Unable to open file
-  #003: (file name) line (number) in H5F_open(): unable to open file: name = 'test', tent_flags = 1
+  #004: (file name) line (number) in H5F_open(): unable to open file: name = 'test', tent_flags = 1
     major: File accessibility
     minor: Unable to open file
-  #004: (file name) line (number) in H5FD_open(): open failed
+  #005: (file name) line (number) in H5FD_open(): open failed
     major: Virtual File Layer
     minor: Unable to initialize object
-  #005: (file name) line (number) in H5FD_sec2_open(): unable to open file: name = 'test', errno = 2, error message = 'No such file or directory', flags = 1, o_flags = 2
+  #006: (file name) line (number) in H5FD_sec2_open(): unable to open file: name = 'test', errno = 2, error message = 'No such file or directory', flags = 1, o_flags = 2
     major: File accessibility
     minor: Unable to open file
 HDF5-DIAG: Error detected in HDF5 (version (number)) thread (IDs):
@@ -57,16 +60,19 @@ HDF5-DIAG: Error detected in HDF5 (version (number)) thread (IDs):
     minor: Unable to open file
   #001: (file name) line (number) in H5VL_file_open(): open failed
     major: Virtual Object Layer
-    minor: Unable to initialize object
-  #002: (file name) line (number) in H5VL_native_file_open(): unable to open file
+    minor: Can't open object
+  #002: (file name) line (number) in H5VL__file_open(): open failed
+    major: Virtual Object Layer
+    minor: Can't open object
+  #003: (file name) line (number) in H5VL__native_file_open(): unable to open file
     major: File accessibility
     minor: Unable to open file
-  #003: (file name) line (number) in H5F_open(): unable to open file: name = 'test', tent_flags = 1
+  #004: (file name) line (number) in H5F_open(): unable to open file: name = 'test', tent_flags = 1
     major: File accessibility
     minor: Unable to open file
-  #004: (file name) line (number) in H5FD_open(): open failed
+  #005: (file name) line (number) in H5FD_open(): open failed
     major: Virtual File Layer
     minor: Unable to initialize object
-  #005: (file name) line (number) in H5FD_sec2_open(): unable to open file: name = 'test', errno = 2, error message = 'No such file or directory', flags = 1, o_flags = 2
+  #006: (file name) line (number) in H5FD_sec2_open(): unable to open file: name = 'test', errno = 2, error message = 'No such file or directory', flags = 1, o_flags = 2
     major: File accessibility
     minor: Unable to open file
diff --git a/java/test/testfiles/JUnit-TestH5Fbasic.txt b/java/test/testfiles/JUnit-TestH5Fbasic.txt
index 467e2fb..cd4e282 100644
--- a/java/test/testfiles/JUnit-TestH5Fbasic.txt
+++ b/java/test/testfiles/JUnit-TestH5Fbasic.txt
@@ -1,7 +1,7 @@
 JUnit version 4.11
 .testH5Fget_mdc_size
 .testH5Fget_mdc_hit_rate
-.testH5Fis_hdf5
+.testH5F_dset_no_attrs_hint
 .testH5Fget_freespace
 .testH5Fclose
 .testH5Fget_filesize
@@ -9,6 +9,7 @@ JUnit version 4.11
 .testH5Freopen_closed
 .testH5Freset_mdc_hit_rate_stats
 .testH5Fget_name
+.testH5Fis_accessible
 .testH5Fcreate
 .testH5Fclear_elink_file_cache
 .testH5Fclose_twice
@@ -17,5 +18,5 @@ JUnit version 4.11
 
 Time:  XXXX
 
-OK (15 tests)
+OK (16 tests)
 
diff --git a/java/test/testfiles/JUnit-TestH5Fparams.txt b/java/test/testfiles/JUnit-TestH5Fparams.txt
index 9d35220..91a8435 100644
--- a/java/test/testfiles/JUnit-TestH5Fparams.txt
+++ b/java/test/testfiles/JUnit-TestH5Fparams.txt
@@ -1,4 +1,5 @@
 JUnit version 4.11
+.testH5Fis_accessible_null
 .testH5Fcreate_null
 .testH5Fflush_local
 .testH5Fget_info
@@ -8,10 +9,8 @@ JUnit version 4.11
 .testH5Funmount_null
 .testH5Fclose_negative
 .testH5Fopen_null
-.testH5Fis_hdf5_null
-.testH5Fis_hdf5_text
 
 Time:  XXXX
 
-OK (11 tests)
+OK (10 tests)
 
diff --git a/java/test/testfiles/JUnit-TestH5P.txt b/java/test/testfiles/JUnit-TestH5P.txt
index c937ae2..01acadd 100644
--- a/java/test/testfiles/JUnit-TestH5P.txt
+++ b/java/test/testfiles/JUnit-TestH5P.txt
@@ -48,7 +48,6 @@ JUnit version 4.11
 .testH5Pset_link_creation_order_invalidvalue
 .testH5P_sym_k
 .testH5PH5Pset_shared_mesg_phase_change_MinbtreeGreaterThanMaxlist
-.testH5Pget_version_null
 .testH5Pset_scaleoffset_Invalidscale_factor
 .testH5Pget_elink_prefix_null
 .testH5Pget_data_transform_IllegalSize
@@ -74,7 +73,6 @@ JUnit version 4.11
 .testH5Pget_shared_mesg_index
 .testH5Pset_link_phase_change
 .testH5Pget_shared_mesg_nindexes
-.testH5Pget_version
 .testH5Pset_elink_acc_flags_InvalidFlag1
 .testH5Pset_elink_acc_flags_InvalidFlag2
 .testH5Pget_link_phase_change_EqualsSet
@@ -87,5 +85,5 @@ JUnit version 4.11
 
 Time:  XXXX
 
-OK (85 tests)
+OK (83 tests)
 
diff --git a/java/test/testfiles/JUnit-TestH5VL.txt b/java/test/testfiles/JUnit-TestH5VL.txt
new file mode 100644
index 0000000..caadf26
--- /dev/null
+++ b/java/test/testfiles/JUnit-TestH5VL.txt
@@ -0,0 +1,11 @@
+JUnit version 4.11
+.testH5VLget_connector_id
+.testH5VLnative_init
+.testH5VLget_connector_name
+.testH5VLclose_NegativeID
+.testH5VLunregister_connector_NegativeID
+
+Time:  XXXX
+
+OK (5 tests)
+
diff --git a/release_docs/INSTALL_CMake.txt b/release_docs/INSTALL_CMake.txt
index edd876a..26cf3ce 100644
--- a/release_docs/INSTALL_CMake.txt
+++ b/release_docs/INSTALL_CMake.txt
@@ -641,7 +641,6 @@ HDF5_GENERATE_HEADERS          "Rebuild Generated Files"
 HDF5_BUILD_GENERATORS          "Build Test Generators"                                        OFF
 HDF5_JAVA_PACK_JRE             "Package a JRE installer directory"                            OFF
 HDF5_MEMORY_ALLOC_SANITY_CHECK "Indicate that internal memory allocation sanity checks are enabled" OFF
-HDF5_METADATA_TRACE_FILE       "Enable metadata trace file collection"                        OFF
 HDF5_NO_PACKAGES               "Do not include CPack Packaging"                               OFF
 HDF5_PACK_EXAMPLES             "Package the HDF5 Library Examples Compressed File"            OFF
 HDF5_PACK_MACOSX_FRAMEWORK     "Package the HDF5 Library in a Frameworks"                     OFF
@@ -651,6 +650,7 @@ HDF5_PACKAGE_EXTLIBS           "CPACK - include external libraries"
 HDF5_STRICT_FORMAT_CHECKS      "Whether to perform strict file format checks"                 OFF
 HDF_TEST_EXPRESS               "Control testing framework (0-3)"                              "0"
 HDF5_TEST_VFD                  "Execute tests with different VFDs"                            OFF
+HDF5_TEST_VOL                  "Execute tests with different VOL connectors"                  OFF
 HDF5_USE_16_API_DEFAULT        "Use the HDF5 1.6.x API by default"                            OFF
 HDF5_USE_18_API_DEFAULT        "Use the HDF5 1.8.x API by default"                            OFF
 HDF5_USE_110_API_DEFAULT       "Use the HDF5 1.10.x API by default"                           OFF
diff --git a/release_docs/INSTALL_parallel b/release_docs/INSTALL_parallel
index f32fffc..d3d7830 100644
--- a/release_docs/INSTALL_parallel
+++ b/release_docs/INSTALL_parallel
@@ -102,7 +102,7 @@ qsub -I -q debug -l mppwidth=8
 - configure HDF5:
   RUNSERIAL="aprun -q -n 1" RUNPARALLEL="aprun -q -n 6" FC=ftn CC=cc /path/to/source/configure --enable-fortran --enable-parallel --disable-shared
 
-  RUNSERIAL and RUNPARALLEL tells the library how it should launch programs that are part of the build procedure.
+  RUNSERIAL and RUNPARALLEL tell the library how it should launch programs that are part of the build procedure.
 
 - Compile HDF5: 
   gmake
@@ -155,12 +155,16 @@ to run a parallel application on one processor and on many processors. If the
 compiler is `mpicc' and the user hasn't specified values for RUNSERIAL and
 RUNPARALLEL then configure chooses `mpiexec' from the same directory as `mpicc':
 
-    RUNSERIAL:    /usr/local/mpi/bin/mpiexec -np 1
-    RUNPARALLEL:  /usr/local/mpi/bin/mpiexec -np $${NPROCS:=6}
+    RUNSERIAL:    mpiexec -n 1
+    RUNPARALLEL:  mpiexec -n $${NPROCS:=6}
 
 The `$${NPROCS:=6}' will be substituted with the value of the NPROCS
 environment variable at the time `make check' is run (or the value 6).
 
+Note that some MPI implementations (e.g. OpenMPI 4.0) disallow oversubscribing
+nodes by default so you'll have to either set NPROCS equal to the number of
+processors available (or fewer) or redefine RUNPARALLEL with appropriate
+flag(s) (--oversubscribe in OpenMPI).
 
 4. Parallel test suite
 ----------------------
diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt
index c5c8300..2dfcfc1 100644
--- a/release_docs/RELEASE.txt
+++ b/release_docs/RELEASE.txt
@@ -1,4 +1,4 @@
-HDF5 version 1.11.4 currently under development
+ version 1.11.4 currently under development
 ================================================================================
 
 
@@ -48,6 +48,15 @@ New Features
 
     Configuration:
     -------------
+    - Keep stderr and stdout separate in tests
+
+      Changed test handling of output capture. Tests now keep the stderr
+      output separate from the stdout output. It is up to the test to decide
+      which output to check against a reference. Also added the option
+      to grep for a string in either output.
+
+      (ADB - 2018/12/12, HDFFV-10632)
+
     - Add toolchain and cross-compile support
 
       Added info on using a toolchain file to INSTALL_CMAKE.txt. A
@@ -110,7 +119,7 @@ New Features
 
       (ADB - 2018/07/16)
 
- 
+
     Library:
     --------
     - Allow pre-generated H5Tinit.c and H5make_libsettings.c to be used.
@@ -120,14 +129,41 @@ New Features
 
       (ADB - 2018/09/18, HDFFV-10332)
 
+    - Remove H5I_REFERENCE from the library
+
+      This ID class was never used by the library and has been removed.
+
+      (DER - 2018/12/08, HDFFV-10252)
+
 
     Parallel Library:
     -----------------
-    -
+    - Changed the default behavior in parallel when reading the same dataset in its entirely
+      (i.e. H5S_ALL dataset selection) which is being read by all the processes collectively.
+      The dataset mush be contiguous, less than 2GB, and of an atomic datatype.
+      The new behavior is the HDF5 library will use an MPI_Bcast to pass the data read from 
+      the disk by the root process to the remain processes in the MPI communicator associated 
+      with the HDF5 file.
+
+      (MSB - 2019/01/02, HDFFV-10652)
 
     Fortran Library:
     ----------------
-    -
+    - Added new Fortran derived type, c_h5o_info_t, which is interoperable with
+      C's h5o_info_t. This is needed for callback functions which
+      pass C's h5o_info_t data type definition.
+
+      (MSB, 2019/01/08, HDFFV-10443)
+
+    - Added new Fortran API, H5gmtime, which converts (C) 'time_t' structure
+      to Fortran DATE AND TIME storage format.
+      
+      (MSB, 2019/01/08, HDFFV-10443)
+
+    - Added new Fortran 'fields' optional parameter to: h5ovisit_f, h5oget_info_by_name_f, 
+      h5oget_info, h5oget_info_by_idx and h5ovisit_by_name_f.
+
+      (MSB, 2019/01/08, HDFFV-10443)
 
     C++ Library:
     ------------
@@ -181,6 +217,23 @@ New Features
 
     Java Library:
     ----------------
+    - Duplicate the data read/write functions of Datasets for Attributes.
+
+      Region references could not be displayed for attributes as they could
+      for datasets. Datasets had overloaded read and write functions for different
+      datatypes that were not available for attributes. After adding similar
+      functions, attribute region references work normally.
+
+      (ADB - 2018/12/12, HDFVIEW-4)
+
+
+    - Removed H5I_REFERENCE from the Java wrappers
+
+      This ID class was never used by the library and has been removed
+      from the Java wrappers.
+
+      (DER - 2018/12/08, HDFFV-10252)
+
 
     Tools:
     ------
@@ -211,6 +264,19 @@ Bug Fixes since HDF5-1.10.3 release
 
     Library
     -------
+    - Deleting attributes in dense storage
+
+      The library aborts with "infinite loop closing library" after
+      attributes in dense storage are created and then deleted.
+
+      When deleting the attribute nodes from the name index v2 B-tree,
+      if an attribute is found in the intermediate B-tree nodes,
+      which may be merged/redistributed in the process, we need to 
+      free the dynamically allocated spaces for the intermediate 
+      decoded attribute.
+
+      (VC - 2018/12/26, HDFFV-10659)
+
     - Allow H5detect and H5make_libsettings to take a file as an argument.
 
       Rather than only writing to stdout, add a command argument to name
@@ -282,12 +348,27 @@ Bug Fixes since HDF5-1.10.3 release
 
     Fortran
     --------
+    - Added symbolic links libhdf5_hl_fortran.so to libhdf5hl_fortran.so and
+      libhdf5_hl_fortran.a to libhdf5hl_fortran.a in hdf5/lib directory for 
+      autotools installs.  These were added to match the name of the files 
+      installed by cmake and the general pattern of hl lib files.  We will 
+      change the names of the installed lib files to the matching name in 
+      the next major release.
+
+      (LRK - 2019/01/04, HDFFV-10596)
+
     - Made Fortran specific subroutines PRIVATE in generic procedures.
 
       Effected generic procedures were functions in H5A, H5D, H5P, H5R and H5T.
-    
+
       (MSB, 2018/12/04, HDFFV-10511)
- 
+
+    - Fixed issue with Fortran not returning h5o_info_t field values 
+      meta_size%attr%index_size and  meta_size%attr%heap_size.
+
+      (MSB, 2018/1/8, HDFFV-10443)
+
+
     Tools
     -----
     -
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index cd81ba5..ff7402b 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -39,7 +39,6 @@ IDE_GENERATED_PROPERTIES ("H5A" "${H5A_HDRS}" "${H5A_SOURCES}" )
 set (H5AC_SOURCES
     ${HDF5_SRC_DIR}/H5AC.c
     ${HDF5_SRC_DIR}/H5ACdbg.c
-    ${HDF5_SRC_DIR}/H5AClog.c
     ${HDF5_SRC_DIR}/H5ACmpio.c
     ${HDF5_SRC_DIR}/H5ACproxy_entry.c
 )
@@ -81,6 +80,8 @@ set (H5C_SOURCES
     ${HDF5_SRC_DIR}/H5Cepoch.c
     ${HDF5_SRC_DIR}/H5Cimage.c
     ${HDF5_SRC_DIR}/H5Clog.c
+    ${HDF5_SRC_DIR}/H5Clog_json.c
+    ${HDF5_SRC_DIR}/H5Clog_trace.c
     ${HDF5_SRC_DIR}/H5Cmpio.c
     ${HDF5_SRC_DIR}/H5Cprefetched.c
     ${HDF5_SRC_DIR}/H5Cquery.c
@@ -628,6 +629,13 @@ set (H5VL_SOURCES
     ${HDF5_SRC_DIR}/H5VLcallback.c
     ${HDF5_SRC_DIR}/H5VLint.c
     ${HDF5_SRC_DIR}/H5VLnative.c
+    ${HDF5_SRC_DIR}/H5VLnative_attr.c
+    ${HDF5_SRC_DIR}/H5VLnative_dataset.c
+    ${HDF5_SRC_DIR}/H5VLnative_datatype.c
+    ${HDF5_SRC_DIR}/H5VLnative_file.c
+    ${HDF5_SRC_DIR}/H5VLnative_group.c
+    ${HDF5_SRC_DIR}/H5VLnative_link.c
+    ${HDF5_SRC_DIR}/H5VLnative_object.c
     ${HDF5_SRC_DIR}/H5VLpassthru.c
 )
 set (H5VL_HDRS
@@ -772,6 +780,7 @@ set (H5_PRIVATE_HEADERS
     ${HDF5_SRC_DIR}/H5B2pkg.h
     ${HDF5_SRC_DIR}/H5B2private.h
 
+    ${HDF5_SRC_DIR}/H5Clog.h
     ${HDF5_SRC_DIR}/H5Cpkg.h
     ${HDF5_SRC_DIR}/H5Cprivate.h
 
@@ -869,6 +878,7 @@ set (H5_PRIVATE_HEADERS
 
     ${HDF5_SRC_DIR}/H5UCprivate.h
 
+    ${HDF5_SRC_DIR}/H5VLnative_private.h
     ${HDF5_SRC_DIR}/H5VLpkg.h
     ${HDF5_SRC_DIR}/H5VLprivate.h
 
@@ -933,6 +943,21 @@ if (BUILD_SHARED_LIBS)
   file (MAKE_DIRECTORY "${HDF5_BINARY_DIR}/shared")
 endif ()
 
+if (LOCAL_BATCH_TEST)
+  if (LOCAL_BATCH_SCRIPT_NAME)
+    configure_file (
+        ${HDF5_SOURCE_DIR}/bin/batch/${LOCAL_BATCH_SCRIPT_NAME}.in.cmake
+        ${HDF5_BINARY_DIR}/${LOCAL_BATCH_SCRIPT_NAME} ESCAPE_QUOTES @ONLY
+    )
+  endif ()
+  if (LOCAL_BATCH_SCRIPT_PARALLEL_NAME)
+    configure_file (
+        ${HDF5_SOURCE_DIR}/bin/batch/${LOCAL_BATCH_SCRIPT_PARALLEL_NAME}.in.cmake
+        ${HDF5_BINARY_DIR}/${LOCAL_BATCH_SCRIPT_PARALLEL_NAME} ESCAPE_QUOTES @ONLY
+    )
+  endif ()
+endif ()
+
 if (NOT EXISTS ${HDF5_GENERATED_SOURCE_DIR}/H5Tinit.c)
   add_executable (H5detect ${HDF5_SRC_DIR}/H5detect.c)
   target_include_directories(H5detect PRIVATE "${HDF5_SRC_DIR};${HDF5_BINARY_DIR};$<$<BOOL:${HDF5_ENABLE_PARALLEL}>:${MPI_C_INCLUDE_DIRS}>")
@@ -950,10 +975,13 @@ if (NOT EXISTS ${HDF5_GENERATED_SOURCE_DIR}/H5Tinit.c)
     )
     add_custom_command (
         OUTPUT ${HDF5_GENERATED_SOURCE_DIR}/H5Tinit.c
+               ${HDF5_GENERATED_SOURCE_DIR}/gen_SRCS.stamp1
         COMMAND ${HDF5_BATCH_CMD}
         ARGS ${HDF5_BINARY_DIR}/${HDF5_BATCH_H5DETECT_SCRIPT}
         COMMAND ${CMAKE_COMMAND}
         ARGS -E echo "Executed batch command to create H5Tinit.c"
+        COMMAND    ${CMAKE_COMMAND}
+        ARGS       -E touch ${HDF5_GENERATED_SOURCE_DIR}/gen_SRCS.stamp1
         DEPENDS H5detect
         WORKING_DIRECTORY ${HDF5_GENERATED_SOURCE_DIR}
     )
@@ -963,31 +991,62 @@ if (NOT EXISTS ${HDF5_GENERATED_SOURCE_DIR}/H5Tinit.c)
     if (BUILD_SHARED_LIBS)
       add_custom_command (
           OUTPUT     ${HDF5_GENERATED_SOURCE_DIR}/shared/H5Tinit.c
+                     ${HDF5_GENERATED_SOURCE_DIR}/shared/shared_gen_SRCS.stamp1
           COMMAND    ${CMAKE_COMMAND}
           ARGS       -E copy_if_different "${HDF5_GENERATED_SOURCE_DIR}/H5Tinit.c" "${HDF5_GENERATED_SOURCE_DIR}/shared/H5Tinit.c"
+          COMMAND    ${CMAKE_COMMAND}
+          ARGS       -E touch ${HDF5_GENERATED_SOURCE_DIR}/shared/shared_gen_SRCS.stamp1
           DEPENDS    gen_H5Tinit ${HDF5_GENERATED_SOURCE_DIR}/H5Tinit_created
+          WORKING_DIRECTORY ${HDF5_GENERATED_SOURCE_DIR}
       )
       set_source_files_properties (${HDF5_GENERATED_SOURCE_DIR}/shared/H5Tinit.c PROPERTIES GENERATED TRUE)
     endif ()
   else ()
     add_custom_command (
         OUTPUT ${HDF5_GENERATED_SOURCE_DIR}/H5Tinit.c
+               ${HDF5_GENERATED_SOURCE_DIR}/gen_SRCS.stamp1
         COMMAND ${CMAKE_CROSSCOMPILING_EMULATOR}$<TARGET_FILE:H5detect>
         ARGS ${HDF5_GENERATED_SOURCE_DIR}/H5Tinit.c
+        COMMAND    ${CMAKE_COMMAND}
+        ARGS       -E touch ${HDF5_GENERATED_SOURCE_DIR}/gen_SRCS.stamp1
         DEPENDS H5detect
         WORKING_DIRECTORY ${HDF5_GENERATED_SOURCE_DIR}
     )
     if (BUILD_SHARED_LIBS)
       add_custom_command (
           OUTPUT     ${HDF5_GENERATED_SOURCE_DIR}/shared/H5Tinit.c
+                     ${HDF5_GENERATED_SOURCE_DIR}/shared/shared_gen_SRCS.stamp1
           COMMAND    ${CMAKE_COMMAND}
           ARGS       -E copy_if_different "${HDF5_GENERATED_SOURCE_DIR}/H5Tinit.c" "${HDF5_GENERATED_SOURCE_DIR}/shared/H5Tinit.c"
+          COMMAND    ${CMAKE_COMMAND}
+          ARGS       -E touch ${HDF5_GENERATED_SOURCE_DIR}/shared/shared_gen_SRCS.stamp1
           DEPENDS    ${HDF5_GENERATED_SOURCE_DIR}/H5Tinit.c
+          WORKING_DIRECTORY ${HDF5_GENERATED_SOURCE_DIR}
       )
       set_source_files_properties (${HDF5_GENERATED_SOURCE_DIR}/shared/H5Tinit.c PROPERTIES GENERATED TRUE)
     endif ()
   endif ()
   set_source_files_properties (${HDF5_GENERATED_SOURCE_DIR}/H5Tinit.c PROPERTIES GENERATED TRUE)
+else ()
+  add_custom_command (
+      OUTPUT ${HDF5_GENERATED_SOURCE_DIR}/gen_SRCS.stamp1
+      COMMAND    ${CMAKE_COMMAND}
+      ARGS       -E touch ${HDF5_GENERATED_SOURCE_DIR}/gen_SRCS.stamp1
+      DEPENDS    ${HDF5_GENERATED_SOURCE_DIR}/H5Tinit.c
+      WORKING_DIRECTORY ${HDF5_GENERATED_SOURCE_DIR}
+  )
+  if (BUILD_SHARED_LIBS)
+    add_custom_command (
+        OUTPUT     ${HDF5_GENERATED_SOURCE_DIR}/shared/shared_gen_SRCS.stamp1
+        COMMAND    ${CMAKE_COMMAND}
+        ARGS       -E copy_if_different "${HDF5_GENERATED_SOURCE_DIR}/H5Tinit.c" "${HDF5_GENERATED_SOURCE_DIR}/shared/H5Tinit.c"
+        COMMAND    ${CMAKE_COMMAND}
+        ARGS       -E touch ${HDF5_GENERATED_SOURCE_DIR}/shared/shared_gen_SRCS.stamp1
+        DEPENDS    ${HDF5_GENERATED_SOURCE_DIR}/H5Tinit.c
+        WORKING_DIRECTORY ${HDF5_GENERATED_SOURCE_DIR}
+    )
+    set_source_files_properties (${HDF5_GENERATED_SOURCE_DIR}/shared/H5Tinit.c PROPERTIES GENERATED TRUE)
+  endif ()
 endif ()
 
 add_executable (H5make_libsettings ${HDF5_SRC_DIR}/H5make_libsettings.c)
@@ -1001,8 +1060,11 @@ target_link_libraries (H5make_libsettings
 
 add_custom_command (
     OUTPUT ${HDF5_BINARY_DIR}/H5lib_settings.c
+           ${HDF5_BINARY_DIR}/gen_SRCS.stamp2
     COMMAND ${CMAKE_CROSSCOMPILING_EMULATOR}$<TARGET_FILE:H5make_libsettings>
     ARGS ${HDF5_BINARY_DIR}/H5lib_settings.c
+    COMMAND    ${CMAKE_COMMAND}
+    ARGS       -E touch ${HDF5_GENERATED_SOURCE_DIR}/gen_SRCS.stamp2
     DEPENDS H5make_libsettings
     WORKING_DIRECTORY ${HDF5_BINARY_DIR}
 )
@@ -1010,9 +1072,13 @@ set_source_files_properties (${HDF5_BINARY_DIR}/H5lib_settings.c PROPERTIES GENE
 if (BUILD_SHARED_LIBS)
   add_custom_command (
       OUTPUT ${HDF5_BINARY_DIR}/shared/H5lib_settings.c
+             ${HDF5_BINARY_DIR}/shared/shared_gen_SRCS.stamp2
       COMMAND    ${CMAKE_COMMAND}
       ARGS       -E copy_if_different "${HDF5_BINARY_DIR}/H5lib_settings.c" "${HDF5_BINARY_DIR}/shared/H5lib_settings.c"
+      COMMAND    ${CMAKE_COMMAND}
+      ARGS       -E touch ${HDF5_GENERATED_SOURCE_DIR}/shared/shared_gen_SRCS.stamp2
       DEPENDS    ${HDF5_BINARY_DIR}/H5lib_settings.c
+      WORKING_DIRECTORY ${HDF5_BINARY_DIR}
   )
   set_source_files_properties (${HDF5_BINARY_DIR}/shared/H5lib_settings.c PROPERTIES GENERATED TRUE)
 endif ()
@@ -1025,8 +1091,8 @@ option (HDF5_ENABLE_DEBUG_APIS "Turn on extra debug output in all packages" OFF)
 # Add H5Tinit source to build - generated by H5detect/CMake at configure time
 #-----------------------------------------------------------------------------
 set (gen_SRCS ${HDF5_GENERATED_SOURCE_DIR}/H5Tinit.c ${HDF5_BINARY_DIR}/H5lib_settings.c)
+add_custom_target (gen_${HDF5_LIB_TARGET} ALL DEPENDS ${HDF5_GENERATED_SOURCE_DIR}/gen_SRCS.stamp1 ${HDF5_GENERATED_SOURCE_DIR}/gen_SRCS.stamp2)
 
-add_custom_target (gen_${HDF5_LIB_TARGET} ALL DEPENDS ${gen_SRCS})
 add_library (${HDF5_LIB_TARGET} STATIC ${common_SRCS} ${gen_SRCS} ${H5_PUBLIC_HEADERS} ${H5_PRIVATE_HEADERS} ${H5_GENERATED_HEADERS})
 target_include_directories(${HDF5_LIB_TARGET}
     PRIVATE "${HDF5_SRC_DIR};${HDF5_BINARY_DIR};$<$<BOOL:${HDF5_ENABLE_PARALLEL}>:${MPI_C_INCLUDE_DIRS}>"
@@ -1055,8 +1121,8 @@ set (install_targets ${HDF5_LIB_TARGET})
 
 if (BUILD_SHARED_LIBS)
   set (shared_gen_SRCS ${HDF5_GENERATED_SOURCE_DIR}/shared/H5Tinit.c ${HDF5_BINARY_DIR}/shared/H5lib_settings.c)
+  add_custom_target (gen_${HDF5_LIBSH_TARGET} ALL DEPENDS ${HDF5_GENERATED_SOURCE_DIR}/shared/shared_gen_SRCS.stamp1 ${HDF5_GENERATED_SOURCE_DIR}/shared/shared_gen_SRCS.stamp2)
 
-  add_custom_target (gen_${HDF5_LIBSH_TARGET} ALL DEPENDS ${shared_gen_SRCS})
   add_library (${HDF5_LIBSH_TARGET} SHARED ${common_SRCS} ${shared_gen_SRCS} ${H5_PUBLIC_HEADERS} ${H5_PRIVATE_HEADERS} ${H5_GENERATED_HEADERS})
   target_include_directories(${HDF5_LIBSH_TARGET}
       PRIVATE "${HDF5_SRC_DIR};${HDF5_BINARY_DIR};$<$<BOOL:${HDF5_ENABLE_PARALLEL}>:${MPI_C_INCLUDE_DIRS}>"
diff --git a/src/H5A.c b/src/H5A.c
index 0d20912..9c3ad7e 100644
--- a/src/H5A.c
+++ b/src/H5A.c
@@ -951,6 +951,8 @@ H5Aget_name_by_idx(hid_t loc_id, const char *obj_name, H5_index_t idx_type,
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
     if(!obj_name || !*obj_name)
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name")
+    if(!name && size)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "name cannot be NULL if size is non-zero")
     if(idx_type <= H5_INDEX_UNKNOWN || idx_type >= H5_INDEX_N)
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid index type specified")
     if(order <= H5_ITER_UNKNOWN || order >= H5_ITER_N)
@@ -1046,6 +1048,8 @@ H5Aget_info(hid_t attr_id, H5A_info_t *ainfo)
     /* Check arguments */
     if(NULL == (vol_obj = (H5VL_object_t *)H5I_object_verify(attr_id, H5I_ATTR)))
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not an attribute")
+    if(!ainfo)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "attribute_info parameter cannot be NULL")
 
     loc_params.type = H5VL_OBJECT_BY_SELF;
     loc_params.obj_type = H5I_get_type(attr_id);
@@ -1199,10 +1203,16 @@ H5Arename(hid_t loc_id, const char *old_name, const char *new_name)
     H5TRACE3("e", "i*s*s", loc_id, old_name, new_name);
 
     /* check arguments */
-    if(!old_name || !new_name)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "name is nil")
     if(H5I_ATTR == H5I_get_type(loc_id))
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "location is not valid for an attribute")
+    if(!old_name)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "old attribute name cannot be NULL")
+    if(!*old_name)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "old attribute name cannot be an empty string")
+    if(!new_name)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "new attribute name cannot be NULL")
+    if(!*new_name)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "new attribute name cannot be an empty string")
 
     /* Avoid thrashing things if the names are the same */
     if(HDstrcmp(old_name, new_name)) {
@@ -1358,7 +1368,7 @@ H5Aiterate2(hid_t loc_id, H5_index_t idx_type, H5_iter_order_t order,
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid location identifier")
 
     /* Iterate over attributes */
-    if((ret_value = H5VL_attr_specific(vol_obj, &loc_params, H5VL_ATTR_ITER, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, idx_type, order, idx, op, op_data)) < 0)
+    if((ret_value = H5VL_attr_specific(vol_obj, &loc_params, H5VL_ATTR_ITER, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, (int)idx_type, (int)order, idx, op, op_data)) < 0)
         HERROR(H5E_ATTR, H5E_BADITER, "error iterating over attributes");
 
 done:
@@ -1446,7 +1456,7 @@ H5Aiterate_by_name(hid_t loc_id, const char *obj_name, H5_index_t idx_type,
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid location identifier")
 
     /* Iterate over attributes */
-    if((ret_value = H5VL_attr_specific(vol_obj, &loc_params, H5VL_ATTR_ITER, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, idx_type, order, idx, op, op_data)) < 0)
+    if((ret_value = H5VL_attr_specific(vol_obj, &loc_params, H5VL_ATTR_ITER, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, (int)idx_type, (int)order, idx, op, op_data)) < 0)
         HERROR(H5E_ATTR, H5E_BADITER, "attribute iteration failed");
 
 done:
diff --git a/src/H5AC.c b/src/H5AC.c
index 9894e39..0a5411a 100644
--- a/src/H5AC.c
+++ b/src/H5AC.c
@@ -30,22 +30,24 @@
 /****************/
 
 #include "H5ACmodule.h"         /* This source code file is part of the H5AC module */
-#define H5F_FRIEND		/* Suppress error about including H5Fpkg            */
+#define H5C_FRIEND              /* Suppress error about including H5Cpkg            */
+#define H5F_FRIEND              /* Suppress error about including H5Fpkg            */
 
 
 /***********/
 /* Headers */
 /***********/
-#include "H5private.h"		/* Generic Functions			*/
-#include "H5ACpkg.h"		/* Metadata cache			*/
-#include "H5Cprivate.h"		/* Cache                                */
-#include "H5CXprivate.h"        /* API Contexts                         */
-#include "H5Eprivate.h"		/* Error handling		  	*/
-#include "H5Fpkg.h"		/* Files				*/
-#include "H5FDprivate.h"	/* File drivers				*/
-#include "H5Iprivate.h"		/* IDs			  		*/
-#include "H5Pprivate.h"         /* Property lists                       */
-#include "H5SLprivate.h"        /* Skip Lists                           */
+#include "H5private.h"          /* Generic Functions                        */
+#include "H5ACpkg.h"            /* Metadata cache                           */
+#include "H5Clog.h"             /* Cache logging                            */
+#include "H5Cpkg.h"             /* Cache                                    */
+#include "H5CXprivate.h"        /* API Contexts                             */
+#include "H5Eprivate.h"         /* Error handling                           */
+#include "H5Fpkg.h"             /* Files                                    */
+#include "H5FDprivate.h"        /* File drivers                             */
+#include "H5Iprivate.h"         /* IDs                                      */
+#include "H5Pprivate.h"         /* Property lists                           */
+#include "H5SLprivate.h"        /* Skip Lists                               */
 
 
 /****************/
@@ -128,7 +130,7 @@ static const H5AC_class_t *const H5AC_class_s[] = {
     H5AC_DRVRINFO,              /* (26) driver info block (supplements superblock) */
     H5AC_EPOCH_MARKER,          /* (27) epoch marker - always internal to cache */
     H5AC_PROXY_ENTRY,           /* (28) cache entry proxy               */
-    H5AC_PREFETCHED_ENTRY  	/* (29) prefetched entry - always internal to cache */
+    H5AC_PREFETCHED_ENTRY       /* (29) prefetched entry - always internal to cache */
 };
 
 
@@ -178,13 +180,16 @@ H5AC__init_package(void)
 
 #ifdef H5_HAVE_PARALLEL
     /* check whether to enable strict collective function calling
-       sanity checks using MPI barriers */
+     * sanity checks using MPI barriers
+     */
     {
         const char *s;  /* String for environment variables */
 
         s = HDgetenv("H5_COLL_API_SANITY_CHECK");
-        if(s && HDisdigit(*s))
-            H5_coll_api_sanity_check_g = (hbool_t)HDstrtol(s, NULL, 0);
+        if(s && HDisdigit(*s)) {
+            long env_val = HDstrtol(s, NULL, 0);
+            H5_coll_api_sanity_check_g = (0 == env_val) ? FALSE : TRUE;
+        }
     }
 #endif /* H5_HAVE_PARALLEL */
 
@@ -403,15 +408,13 @@ H5AC_create(const H5F_t *f, H5AC_cache_config_t *config_ptr, H5AC_cache_image_co
             HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "H5C_set_prefix() failed")
 #endif /* H5_HAVE_PARALLEL */
 
-    /* Turn on metadata cache logging, if being used */
-    if(H5F_USE_MDC_LOGGING(f)) {
-        if(H5C_set_up_logging(f->shared->cache, H5F_MDC_LOG_LOCATION(f), H5F_START_MDC_LOG_ON_ACCESS(f)) < 0)
-            HGOTO_ERROR(H5E_CACHE, H5E_CANTINIT, FAIL, "mdc logging setup failed")
-
-        /* Write the log header regardless of current logging status */
-        if(H5AC__write_create_cache_log_msg(f->shared->cache) < 0)
-            HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-    } /* end if */
+    /* Turn on metadata cache logging, if being used
+     * This will be JSON until we create a special API call. Trace output
+     * is generated when logging is controlled by the struct.
+     */
+    if(H5F_USE_MDC_LOGGING(f))
+        if(H5C_log_set_up(f->shared->cache, H5F_MDC_LOG_LOCATION(f), H5C_LOG_STYLE_JSON, H5F_START_MDC_LOG_ON_ACCESS(f)) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "mdc logging setup failed")
 
     /* Set the cache parameters */
     if(H5AC_set_cache_auto_resize_config(f->shared->cache, config_ptr) < 0)
@@ -431,6 +434,11 @@ H5AC_create(const H5F_t *f, H5AC_cache_config_t *config_ptr, H5AC_cache_image_co
         HGOTO_ERROR(H5E_CACHE, H5E_CANTSET, FAIL, "auto resize configuration failed")
 
 done:
+    /* If currently logging, generate a message */
+    if(f->shared->cache->log_info->logging)
+        if(H5C_log_write_create_cache_msg(f->shared->cache, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
 #ifdef H5_HAVE_PARALLEL
     /* if there is a failure, try to tidy up the auxiliary structure */
     if(ret_value < 0) {
@@ -469,6 +477,8 @@ done:
 herr_t
 H5AC_dest(H5F_t *f)
 {
+    hbool_t log_enabled;             /* TRUE if logging was set up */
+    hbool_t curr_logging;            /* TRUE if currently logging */
 #ifdef H5_HAVE_PARALLEL
     H5AC_aux_t * aux_ptr = NULL;
 #endif /* H5_HAVE_PARALLEL */
@@ -486,18 +496,16 @@ H5AC_dest(H5F_t *f)
     H5AC_stats(f);
 #endif /* H5AC_DUMP_STATS_ON_CLOSE */
 
-#if H5AC__TRACE_FILE_ENABLED
-    if(H5AC__close_trace_file(f->shared->cache) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "H5AC__close_trace_file() failed")
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
-    if(H5F_USE_MDC_LOGGING(f)) {
-        /* Write the log footer regardless of current logging status */
-        if(H5AC__write_destroy_cache_log_msg(f->shared->cache) < 0)
-            HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-        if(H5C_tear_down_logging(f->shared->cache) < 0)
-            HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "mdc logging tear-down failed")
-    } /* end if */
+    /* Check if log messages are being emitted */
+    if(H5C_get_logging_status(f->shared->cache, &log_enabled, &curr_logging) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to get logging status")
+    if(log_enabled && curr_logging)
+        if(H5C_log_write_destroy_cache_msg(f->shared->cache) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+    /* Tear down logging */
+    if(log_enabled)
+        if(H5C_log_tear_down(f->shared->cache) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "mdc logging tear-down failed")
 
 #ifdef H5_HAVE_PARALLEL
     /* destroying the cache, so clear all collective entries */
@@ -565,8 +573,6 @@ done:
 herr_t
 H5AC_evict(H5F_t *f)
 {
-    hbool_t log_enabled;             /* TRUE if logging was set up */
-    hbool_t curr_logging;            /* TRUE if currently logging */
     herr_t ret_value = SUCCEED;      /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
@@ -576,10 +582,6 @@ H5AC_evict(H5F_t *f)
     HDassert(f->shared);
     HDassert(f->shared->cache);
 
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(f->shared->cache, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to get logging status")
-
     /* Evict all entries in the cache except the pinned superblock entry */
     if(H5C_evict(f) < 0)
         HGOTO_ERROR(H5E_CACHE, H5E_CANTFREE, FAIL, "can't evict cache")
@@ -587,9 +589,9 @@ H5AC_evict(H5F_t *f)
 done:
 
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_evict_cache_log_msg(f->shared->cache, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(f->shared->cache->log_info->logging)
+        if(H5C_log_write_evict_cache_msg(f->shared->cache, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_evict() */
@@ -613,12 +615,6 @@ herr_t
 H5AC_expunge_entry(H5F_t *f, const H5AC_class_t *type, haddr_t addr,
     unsigned flags)
 {
-#if H5AC__TRACE_FILE_ENABLED
-    char                trace[128] = "";
-    FILE *              trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-    hbool_t log_enabled;              /* TRUE if logging was set up */
-    hbool_t curr_logging;             /* TRUE if currently logging */
     herr_t  ret_value = SUCCEED;      /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
@@ -631,36 +627,14 @@ H5AC_expunge_entry(H5F_t *f, const H5AC_class_t *type, haddr_t addr,
     HDassert(type->serialize);
     HDassert(H5F_addr_defined(addr));
 
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(f->shared->cache, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to get logging status")
-
-#if H5AC__TRACE_FILE_ENABLED
-{
-    H5AC_t * cache_ptr = f->shared->cache;
-
-    /* For the expunge entry call, only the addr, and type id are really
-     * necessary in the trace file.  Write the return value to catch occult
-     * errors.
-     */
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr(cache_ptr)))
-        sprintf(trace, "%s 0x%lx %d", FUNC, (unsigned long)addr, (int)(type->id));
-}
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     if(H5C_expunge_entry(f, type, addr, flags) < 0)
         HGOTO_ERROR(H5E_CACHE, H5E_CANTEXPUNGE, FAIL, "H5C_expunge_entry() failed")
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr != NULL)
-	HDfprintf(trace_file_ptr, "%s %d\n", trace, (int)ret_value);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_expunge_entry_log_msg(f->shared->cache, addr, type->id, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(f->shared->cache->log_info->logging)
+        if(H5C_log_write_expunge_entry_msg(f->shared->cache, addr, type->id, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_expunge_entry() */
@@ -689,12 +663,6 @@ done:
 herr_t
 H5AC_flush(H5F_t *f)
 {
-#if H5AC__TRACE_FILE_ENABLED
-    char 	  trace[128] = "";
-    FILE *	  trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-    hbool_t log_enabled;              /* TRUE if logging was set up */
-    hbool_t curr_logging;             /* TRUE if currently logging */
     herr_t ret_value = SUCCEED;      /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
@@ -704,18 +672,6 @@ H5AC_flush(H5F_t *f)
     HDassert(f->shared);
     HDassert(f->shared->cache);
 
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(f->shared->cache, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to get logging status")
-
-#if H5AC__TRACE_FILE_ENABLED
-    /* For the flush, only the flags are really necessary in the trace file.
-     * Write the result to catch occult errors.
-     */
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr(cache_ptr)))
-	sprintf(trace, "%s", FUNC);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
 #ifdef H5_HAVE_PARALLEL
     /* flushing the cache, so clear all collective entries */
     if(H5C_clear_coll_entries(f->shared->cache, FALSE) < 0)
@@ -732,15 +688,10 @@ H5AC_flush(H5F_t *f)
         HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "Can't flush cache")
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr != NULL)
-        HDfprintf(trace_file_ptr, "%s %d\n", trace, (int)ret_value);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_flush_cache_log_msg(f->shared->cache, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(f->shared->cache->log_info->logging)
+        if(H5C_log_write_flush_cache_msg(f->shared->cache, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_flush() */
@@ -873,13 +824,6 @@ herr_t
 H5AC_insert_entry(H5F_t *f, const H5AC_class_t *type, haddr_t addr, void *thing,
     unsigned int flags)
 {
-#if H5AC__TRACE_FILE_ENABLED
-    char          	trace[128] = "";
-    size_t              trace_entry_size = 0;
-    FILE *        	trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-    hbool_t log_enabled;             /* TRUE if logging was set up */
-    hbool_t curr_logging;            /* TRUE if currently logging */
     herr_t ret_value = SUCCEED;      /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
@@ -893,26 +837,9 @@ H5AC_insert_entry(H5F_t *f, const H5AC_class_t *type, haddr_t addr, void *thing,
     HDassert(H5F_addr_defined(addr));
     HDassert(thing);
 
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(f->shared->cache, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to get logging status")
-
     /* Check for invalid access request */
     if(0 == (H5F_INTENT(f) & H5F_ACC_RDWR))
-	HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "no write intent on file")
-
-#if H5AC__TRACE_FILE_ENABLED
-    /* For the insert, only the addr, size, type id and flags are really
-     * necessary in the trace file.  Write the result to catch occult
-     * errors.
-     *
-     * Note that some data is not available right now -- put what we can
-     * in the trace buffer now, and fill in the rest at the end.
-     */
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr(cache_ptr)))
-        sprintf(trace, "%s 0x%lx %d 0x%x", FUNC, (unsigned long)addr, type->id,
-            flags);
-#endif /* H5AC__TRACE_FILE_ENABLED */
+        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "no write intent on file")
 
 #if H5AC_DO_TAGGING_SANITY_CHECKS
     if(!H5C_get_ignore_tags(f->shared->cache) && H5AC__verify_tag(type) < 0)
@@ -923,12 +850,6 @@ H5AC_insert_entry(H5F_t *f, const H5AC_class_t *type, haddr_t addr, void *thing,
     if(H5C_insert_entry(f, type, addr, thing, flags) < 0)
         HGOTO_ERROR(H5E_CACHE, H5E_CANTINS, FAIL, "H5C_insert_entry() failed")
 
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr != NULL)
-        /* make note of the entry size */
-        trace_entry_size = ((H5C_cache_entry_t *)thing)->size;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
 #ifdef H5_HAVE_PARALLEL
 {
     H5AC_aux_t *aux_ptr;
@@ -947,14 +868,10 @@ H5AC_insert_entry(H5F_t *f, const H5AC_class_t *type, haddr_t addr, void *thing,
 #endif /* H5_HAVE_PARALLEL */
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr != NULL)
-	HDfprintf(trace_file_ptr, "%s %d %d\n", trace, (int)trace_entry_size, (int)ret_value);
-#endif /* H5AC__TRACE_FILE_ENABLED */
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_insert_entry_log_msg(f->shared->cache, addr, type->id, flags, ((H5C_cache_entry_t *)thing)->size, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(f->shared->cache->log_info->logging)
+        if(H5C_log_write_insert_entry_msg(f->shared->cache, addr, type->id, flags, ((H5C_cache_entry_t *)thing)->size, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_insert_entry() */
@@ -1011,12 +928,6 @@ done:
 herr_t
 H5AC_mark_entry_dirty(void *thing)
 {
-#if H5AC__TRACE_FILE_ENABLED
-    char          	trace[128] = "";
-    FILE *        	trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-    hbool_t log_enabled;              /* TRUE if logging was set up */
-    hbool_t curr_logging;             /* TRUE if currently logging */
     H5AC_info_t *entry_ptr = NULL;    /* Pointer to the cache entry */
     H5C_t *cache_ptr = NULL;          /* Pointer to the entry's associated metadata cache */
     herr_t ret_value = SUCCEED;       /* Return value */
@@ -1030,19 +941,6 @@ H5AC_mark_entry_dirty(void *thing)
     entry_ptr = (H5AC_info_t *)thing;
     cache_ptr = entry_ptr->cache_ptr;
 
-#if H5AC__TRACE_FILE_ENABLED
-    /* For the mark pinned or protected entry dirty call, only the addr
-     * is really necessary in the trace file.  Write the result to catch
-     * occult errors.
-     */
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr_from_entry(thing)))
-        sprintf(trace, "%s 0x%lx", FUNC, (unsigned long)(entry_ptr->addr));
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(cache_ptr, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to get logging status")
-
 #ifdef H5_HAVE_PARALLEL
 {
     H5AC_aux_t *aux_ptr;
@@ -1059,15 +957,10 @@ H5AC_mark_entry_dirty(void *thing)
         HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKDIRTY, FAIL, "can't mark pinned or protected entry dirty")
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr)
-	HDfprintf(trace_file_ptr, "%s %d\n", trace, (int)ret_value);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_mark_dirty_entry_log_msg(cache_ptr, entry_ptr, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(cache_ptr->log_info->logging)
+        if(H5C_log_write_mark_entry_dirty_msg(cache_ptr, entry_ptr, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_mark_entry_dirty() */
@@ -1076,7 +969,7 @@ done:
 /*-------------------------------------------------------------------------
  * Function:    H5AC_mark_entry_clean
  *
- * Purpose:	Mark a pinned entry as dirty.  The target
+ * Purpose:	Mark a pinned entry as clean.  The target
  * 		entry MUST be pinned.
  *
  * Return:      Non-negative on success/Negative on failure
@@ -1089,12 +982,6 @@ done:
 herr_t
 H5AC_mark_entry_clean(void *thing)
 {
-#if H5AC__TRACE_FILE_ENABLED
-    char          	trace[128] = "";
-    FILE *        	trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-    hbool_t log_enabled;              /* TRUE if logging was set up */
-    hbool_t curr_logging;             /* TRUE if currently logging */
     H5AC_info_t *entry_ptr = NULL;    /* Pointer to the cache entry */
     H5C_t *cache_ptr = NULL;          /* Pointer to the entry's associated metadata cache */
     herr_t ret_value = SUCCEED;       /* Return value */
@@ -1104,23 +991,9 @@ H5AC_mark_entry_clean(void *thing)
     /* Sanity check */
     HDassert(thing);
 
-#if H5AC__TRACE_FILE_ENABLED
-    /* For the mark pinned or protected entry clean call, only the addr
-     * is really necessary in the trace file.  Write the result to catch
-     * occult errors.
-     */
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr_from_entry(thing)))
-        sprintf(trace, "%s 0x%lx", FUNC,
-	        (unsigned long)(((H5C_cache_entry_t *)thing)->addr));
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     entry_ptr = (H5AC_info_t *)thing;
     cache_ptr = entry_ptr->cache_ptr;
 
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(cache_ptr, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to get logging status")
-
 #ifdef H5_HAVE_PARALLEL
 {
     H5AC_aux_t *aux_ptr;
@@ -1137,15 +1010,10 @@ H5AC_mark_entry_clean(void *thing)
         HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKCLEAN, FAIL, "can't mark pinned or protected entry clean")
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr)
-	HDfprintf(trace_file_ptr, "%s %d\n", trace, (int)ret_value);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_mark_clean_entry_log_msg(cache_ptr, entry_ptr, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(cache_ptr->log_info->logging)
+        if(H5C_log_write_mark_entry_clean_msg(cache_ptr, entry_ptr, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_mark_entry_clean() */
@@ -1167,12 +1035,6 @@ done:
 herr_t
 H5AC_mark_entry_unserialized(void *thing)
 {
-#if H5AC__TRACE_FILE_ENABLED
-    char          	trace[128] = "";
-    FILE *        	trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-    hbool_t log_enabled;              /* TRUE if logging was set up */
-    hbool_t curr_logging;             /* TRUE if currently logging */
     H5AC_info_t *entry_ptr = NULL;    /* Pointer to the cache entry */
     H5C_t *cache_ptr = NULL;          /* Pointer to the entry's associated metadata cache */
     herr_t ret_value = SUCCEED;       /* Return value */
@@ -1186,32 +1048,14 @@ H5AC_mark_entry_unserialized(void *thing)
     entry_ptr = (H5AC_info_t *)thing;
     cache_ptr = entry_ptr->cache_ptr;
 
-#if H5AC__TRACE_FILE_ENABLED
-    /* For the mark entry unserialized call, only the addr
-     * is really necessary in the trace file.  Write the result to catch
-     * occult errors.
-     */
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr_from_entry(thing)))
-        sprintf(trace, "%s 0x%lx", FUNC, (unsigned long)(entry_ptr->addr));
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(cache_ptr, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_CANTGET, FAIL, "unable to get logging status")
-
     if(H5C_mark_entry_unserialized(thing) < 0)
         HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKUNSERIALIZED, FAIL, "can't mark entry unserialized")
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr)
-	HDfprintf(trace_file_ptr, "%s %d\n", trace, (int)ret_value);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_mark_unserialized_entry_log_msg(cache_ptr, entry_ptr, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(cache_ptr->log_info->logging)
+        if(H5C_log_write_mark_unserialized_entry_msg(cache_ptr, entry_ptr, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_mark_entry_unserialized() */
@@ -1233,12 +1077,6 @@ done:
 herr_t
 H5AC_mark_entry_serialized(void *thing)
 {
-#if H5AC__TRACE_FILE_ENABLED
-    char          	trace[128] = "";
-    FILE *        	trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-    hbool_t log_enabled;              /* TRUE if logging was set up */
-    hbool_t curr_logging;             /* TRUE if currently logging */
     H5AC_info_t *entry_ptr = NULL;    /* Pointer to the cache entry */
     H5C_t *cache_ptr = NULL;          /* Pointer to the entry's associated metadata cache */
     herr_t ret_value = SUCCEED;       /* Return value */
@@ -1248,36 +1086,17 @@ H5AC_mark_entry_serialized(void *thing)
     /* Sanity check */
     HDassert(thing);
 
-#if H5AC__TRACE_FILE_ENABLED
-    /* For the mark entry serializedn call, only the addr
-     * is really necessary in the trace file.  Write the result to catch
-     * occult errors.
-     */
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr_from_entry(thing)))
-        sprintf(trace, "%s 0x%lx", FUNC,
-	        (unsigned long)(((H5C_cache_entry_t *)thing)->addr));
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     entry_ptr = (H5AC_info_t *)thing;
     cache_ptr = entry_ptr->cache_ptr;
 
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(cache_ptr, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_CANTGET, FAIL, "unable to get logging status")
-
     if(H5C_mark_entry_serialized(thing) < 0)
         HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKSERIALIZED, FAIL, "can't mark entry serialized")
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr)
-	HDfprintf(trace_file_ptr, "%s %d\n", trace, (int)ret_value);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_mark_serialized_entry_log_msg(cache_ptr, entry_ptr, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(cache_ptr->log_info->logging)
+        if(H5C_log_write_mark_serialized_entry_msg(cache_ptr, entry_ptr, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_mark_entry_serialized() */
@@ -1300,15 +1119,9 @@ done:
 herr_t
 H5AC_move_entry(H5F_t *f, const H5AC_class_t *type, haddr_t old_addr, haddr_t new_addr)
 {
-#if H5AC__TRACE_FILE_ENABLED
-    char          	trace[128] = "";
-    FILE *        	trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
 #ifdef H5_HAVE_PARALLEL
     H5AC_aux_t        *aux_ptr;
 #endif /* H5_HAVE_PARALLEL */
-    hbool_t log_enabled;           /* TRUE if logging was set up */
-    hbool_t curr_logging;          /* TRUE if currently logging */
     herr_t ret_value = SUCCEED;    /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
@@ -1321,20 +1134,6 @@ H5AC_move_entry(H5F_t *f, const H5AC_class_t *type, haddr_t old_addr, haddr_t ne
     HDassert(H5F_addr_defined(new_addr));
     HDassert(H5F_addr_ne(old_addr, new_addr));
 
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(f->shared->cache, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to get logging status")
-
-#if H5AC__TRACE_FILE_ENABLED
-    /* For the move call, only the old addr and new addr are really
-     * necessary in the trace file.  Include the type id so we don't have to
-     * look it up.  Also write the result to catch occult errors.
-     */
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr(cache_ptr)))
-        sprintf(trace, "%s 0x%lx 0x%lx %d", FUNC, (unsigned long)old_addr,
-		(unsigned long)new_addr, (int)(type->id));
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
 #ifdef H5_HAVE_PARALLEL
     /* Log moving the entry */
     if(NULL != (aux_ptr = (H5AC_aux_t *)H5C_get_aux_ptr(f->shared->cache)))
@@ -1353,15 +1152,10 @@ H5AC_move_entry(H5F_t *f, const H5AC_class_t *type, haddr_t old_addr, haddr_t ne
 #endif /* H5_HAVE_PARALLEL */
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr != NULL)
-	HDfprintf(trace_file_ptr, "%s %d\n", trace, (int)ret_value);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_move_entry_log_msg(f->shared->cache, old_addr, new_addr, type->id, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(f->shared->cache->log_info->logging)
+        if(H5C_log_write_move_entry_msg(f->shared->cache, old_addr, new_addr, type->id, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_move_entry() */
@@ -1383,12 +1177,6 @@ done:
 herr_t
 H5AC_pin_protected_entry(void *thing)
 {
-#if H5AC__TRACE_FILE_ENABLED
-    char        trace[128] = "";
-    FILE *      trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-    hbool_t log_enabled;                /* TRUE if logging was set up */
-    hbool_t curr_logging;               /* TRUE if currently logging */
     H5AC_info_t *entry_ptr = NULL;      /* Pointer to the cache entry */
     H5C_t *cache_ptr = NULL;            /* Pointer to the entry's associated metadata cache */
     herr_t      ret_value = SUCCEED;    /* Return value */
@@ -1398,37 +1186,19 @@ H5AC_pin_protected_entry(void *thing)
     /* Sanity check */
     HDassert(thing);
 
-#if H5AC__TRACE_FILE_ENABLED
-    /* For the pin protected entry call, only the addr is really necessary
-     * in the trace file.  Also write the result to catch occult errors.
-     */
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr_from_entry(thing)))
-        sprintf(trace, "%s 0x%lx", FUNC,
-	        (unsigned long)(((H5C_cache_entry_t *)thing)->addr));
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     entry_ptr = (H5AC_info_t *)thing;
     cache_ptr = entry_ptr->cache_ptr;
     HDassert(cache_ptr);
 
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(cache_ptr, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to get logging status")
-
     /* Pin entry */
     if(H5C_pin_protected_entry(thing) < 0)
         HGOTO_ERROR(H5E_CACHE, H5E_CANTPIN, FAIL, "can't pin entry")
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr)
-	HDfprintf(trace_file_ptr, "%s %d\n", trace, (int)ret_value);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_pin_entry_log_msg(cache_ptr, entry_ptr, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(cache_ptr->log_info->logging)
+        if(H5C_log_write_pin_entry_msg(cache_ptr, entry_ptr, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_pin_protected_entry() */
@@ -1488,12 +1258,6 @@ done:
 herr_t
 H5AC_create_flush_dependency(void * parent_thing, void * child_thing)
 {
-#if H5AC__TRACE_FILE_ENABLED
-    char        trace[128] = "";
-    FILE *      trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-    hbool_t log_enabled;                /* TRUE if logging was set up */
-    hbool_t curr_logging;               /* TRUE if currently logging */
     H5AC_info_t *entry_ptr = NULL;      /* Pointer to the cache entry */
     H5C_t *cache_ptr = NULL;            /* Pointer to the entry's associated metadata cache */
     herr_t      ret_value = SUCCEED;    /* Return value */
@@ -1504,35 +1268,19 @@ H5AC_create_flush_dependency(void * parent_thing, void * child_thing)
     HDassert(parent_thing);
     HDassert(child_thing);
 
-#if H5AC__TRACE_FILE_ENABLED
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr_from_entry(parent_thing)))
-        sprintf(trace, "%s %lx %lx", FUNC,
-	        (unsigned long)(((H5C_cache_entry_t *)parent_thing)->addr),
-	        (unsigned long)(((H5C_cache_entry_t *)child_thing)->addr));
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     entry_ptr = (H5AC_info_t *)parent_thing;
     cache_ptr = entry_ptr->cache_ptr;
     HDassert(cache_ptr);
 
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(cache_ptr, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to get logging status")
-
     /* Create the flush dependency */
     if(H5C_create_flush_dependency(parent_thing, child_thing) < 0)
         HGOTO_ERROR(H5E_CACHE, H5E_CANTDEPEND, FAIL, "H5C_create_flush_dependency() failed")
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr != NULL)
-	HDfprintf(trace_file_ptr, "%s %d\n", trace, (int)ret_value);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_create_fd_log_msg(cache_ptr, (H5AC_info_t *)parent_thing, (H5AC_info_t *)child_thing, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(cache_ptr->log_info->logging)
+        if(H5C_log_write_create_fd_msg(cache_ptr, (H5AC_info_t *)parent_thing, (H5AC_info_t *)child_thing, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_create_flush_dependency() */
@@ -1566,14 +1314,7 @@ void *
 H5AC_protect(H5F_t *f, const H5AC_class_t *type, haddr_t addr, void *udata,
     unsigned flags)
 {
-#if H5AC__TRACE_FILE_ENABLED
-    char                trace[128] = "";
-    size_t		trace_entry_size = 0;
-    FILE *              trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
     void *              thing = NULL;           /* Pointer to native data structure for entry */
-    hbool_t             log_enabled;            /* TRUE if logging was set up */
-    hbool_t             curr_logging;           /* TRUE if currently logging */
     void *              ret_value = NULL;       /* Return value */
 
     FUNC_ENTER_NOAPI(NULL)
@@ -1586,10 +1327,6 @@ H5AC_protect(H5F_t *f, const H5AC_class_t *type, haddr_t addr, void *udata,
     HDassert(type->serialize);
     HDassert(H5F_addr_defined(addr));
 
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(f->shared->cache, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, NULL, "unable to get logging status")
-
     /* Check for unexpected flags -- H5C__FLUSH_COLLECTIVELY_FLAG
      * only permitted in the parallel case.
      */
@@ -1606,16 +1343,6 @@ H5AC_protect(H5F_t *f, const H5AC_class_t *type, haddr_t addr, void *udata,
     if((0 == (H5F_INTENT(f) & H5F_ACC_RDWR)) && (0 == (flags & H5C__READ_ONLY_FLAG)))
 	HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, NULL, "no write intent on file")
 
-#if H5AC__TRACE_FILE_ENABLED
-    /* For the protect call, only the addr, size, type id, and flags are 
-     * necessary in the trace file.  Also indicate whether the call was 
-     * successful to catch occult errors.
-     */
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr(cache_ptr)))
-        sprintf(trace, "%s 0x%lx %d 0x%x", FUNC, (unsigned long)addr,
-		(int)(type->id), flags);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
 #if H5AC_DO_TAGGING_SANITY_CHECKS
     if(!H5C_get_ignore_tags(f->shared->cache) && H5AC__verify_tag(type) < 0)
         HGOTO_ERROR(H5E_CACHE, H5E_CANTTAG, NULL, "Bad tag value")
@@ -1624,28 +1351,18 @@ H5AC_protect(H5F_t *f, const H5AC_class_t *type, haddr_t addr, void *udata,
     if(NULL == (thing = H5C_protect(f, type, addr, udata, flags)))
         HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, NULL, "H5C_protect() failed")
 
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr != NULL)
-        /* Make note of the entry size */
-        trace_entry_size = ((H5C_cache_entry_t *)thing)->size;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* Set return value */
     ret_value = thing;
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr != NULL)
-	HDfprintf(trace_file_ptr, "%s %d %d\n", trace, (int)trace_entry_size, (int)(ret_value != NULL));
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* If currently logging, generate a message */
-    if(curr_logging) {
+    {
         herr_t fake_ret_value = (NULL == ret_value) ? FAIL : SUCCEED;
 
-        if(H5AC__write_protect_entry_log_msg(f->shared->cache, (H5AC_info_t *)thing, flags, fake_ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, NULL, "unable to emit log message")
-    } /* end if */
+        if(f->shared->cache->log_info->logging)
+            if(H5C_log_write_protect_entry_msg(f->shared->cache, (H5AC_info_t *)thing, type->id, flags, fake_ret_value) < 0)
+                HDONE_ERROR(H5E_CACHE, H5E_LOGGING, NULL, "unable to emit log message")
+    }
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_protect() */
@@ -1666,12 +1383,6 @@ done:
 herr_t
 H5AC_resize_entry(void *thing, size_t new_size)
 {
-#if H5AC__TRACE_FILE_ENABLED
-    char          	trace[128] = "";
-    FILE *        	trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-    hbool_t log_enabled;              /* TRUE if logging was set up */
-    hbool_t curr_logging;             /* TRUE if currently logging */
     H5AC_info_t *entry_ptr = NULL;    /* Pointer to the cache entry */
     H5C_t *cache_ptr = NULL;          /* Pointer to the entry's associated metadata cache */
     herr_t ret_value = SUCCEED;       /* Return value */
@@ -1681,25 +1392,10 @@ H5AC_resize_entry(void *thing, size_t new_size)
     /* Sanity check */
     HDassert(thing);
 
-#if H5AC__TRACE_FILE_ENABLED
-    /* For the resize pinned entry call, only the addr, and new_size are
-     * really necessary in the trace file. Write the result to catch
-     * occult errors.
-     */
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr_from_entry(thing)))
-        sprintf(trace, "%s 0x%lx %d", FUNC,
-	        (unsigned long)(((H5C_cache_entry_t *)thing)->addr),
-		(int)new_size);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     entry_ptr = (H5AC_info_t *)thing;
     cache_ptr = entry_ptr->cache_ptr;
     HDassert(cache_ptr);
 
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(cache_ptr, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to get logging status")
-
     /* Resize the entry */
     if(H5C_resize_entry(thing, new_size) < 0)
         HGOTO_ERROR(H5E_CACHE, H5E_CANTRESIZE, FAIL, "can't resize entry")
@@ -1716,15 +1412,10 @@ H5AC_resize_entry(void *thing, size_t new_size)
 #endif /* H5_HAVE_PARALLEL */
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr)
-	HDfprintf(trace_file_ptr, "%s %d\n", trace, (int)ret_value);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_resize_entry_log_msg(cache_ptr, entry_ptr, new_size, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(cache_ptr->log_info->logging)
+        if(H5C_log_write_resize_entry_msg(cache_ptr, entry_ptr, new_size, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_resize_entry() */
@@ -1746,12 +1437,6 @@ done:
 herr_t
 H5AC_unpin_entry(void *thing)
 {
-#if H5AC__TRACE_FILE_ENABLED
-    char                trace[128] = "";
-    FILE *              trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-    hbool_t log_enabled;              /* TRUE if logging was set up */
-    hbool_t curr_logging;             /* TRUE if currently logging */
     H5AC_info_t *entry_ptr = NULL;    /* Pointer to the cache entry */
     H5C_t *cache_ptr = NULL;          /* Pointer to the entry's associated metadata cache */
     herr_t      ret_value = SUCCEED;    /* Return value */
@@ -1761,37 +1446,19 @@ H5AC_unpin_entry(void *thing)
     /* Sanity check */
     HDassert(thing);
 
-#if H5AC__TRACE_FILE_ENABLED
-    /* For the unpin entry call, only the addr is really necessary
-     * in the trace file.  Also write the result to catch occult errors.
-     */
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr_from_entry(thing)))
-        sprintf(trace, "%s 0x%lx", FUNC,
-	        (unsigned long)(((H5C_cache_entry_t *)thing)->addr));
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     entry_ptr = (H5AC_info_t *)thing;
     cache_ptr = entry_ptr->cache_ptr;
     HDassert(cache_ptr);
 
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(cache_ptr, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to get logging status")
-
     /* Unpin the entry */
     if(H5C_unpin_entry(thing) < 0)
         HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPIN, FAIL, "can't unpin entry")
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr)
-	HDfprintf(trace_file_ptr, "%s %d\n", trace, (int)ret_value);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_unpin_entry_log_msg(cache_ptr, entry_ptr, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(cache_ptr->log_info->logging)
+        if(H5C_log_write_unpin_entry_msg(cache_ptr, entry_ptr, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_unpin_entry() */
@@ -1812,12 +1479,6 @@ done:
 herr_t
 H5AC_destroy_flush_dependency(void * parent_thing, void * child_thing)
 {
-#if H5AC__TRACE_FILE_ENABLED
-    char                trace[128] = "";
-    FILE *              trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-    hbool_t log_enabled;                /* TRUE if logging was set up */
-    hbool_t curr_logging;               /* TRUE if currently logging */
     H5AC_info_t *entry_ptr = NULL;      /* Pointer to the cache entry */
     H5C_t *cache_ptr = NULL;            /* Pointer to the entry's associated metadata cache */
     herr_t      ret_value = SUCCEED;    /* Return value */
@@ -1828,35 +1489,19 @@ H5AC_destroy_flush_dependency(void * parent_thing, void * child_thing)
     HDassert(parent_thing);
     HDassert(child_thing);
 
-#if H5AC__TRACE_FILE_ENABLED
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr_from_entry(parent_thing)))
-        sprintf(trace, "%s %llx %llx", FUNC,
-	        (unsigned long long)(((H5C_cache_entry_t *)parent_thing)->addr),
-	        (unsigned long long)(((H5C_cache_entry_t *)child_thing)->addr));
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     entry_ptr = (H5AC_info_t *)parent_thing;
     cache_ptr = entry_ptr->cache_ptr;
     HDassert(cache_ptr);
 
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(cache_ptr, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to get logging status")
-
     /* Destroy the flush dependency */
     if(H5C_destroy_flush_dependency(parent_thing, child_thing) < 0)
         HGOTO_ERROR(H5E_CACHE, H5E_CANTUNDEPEND, FAIL, "H5C_destroy_flush_dependency() failed")
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr != NULL)
-	HDfprintf(trace_file_ptr, "%s %d\n", trace, (int)ret_value);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_destroy_fd_log_msg(cache_ptr, (H5AC_info_t *)parent_thing, (H5AC_info_t *)child_thing, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(cache_ptr->log_info->logging)
+        if(H5C_log_write_destroy_fd_msg(cache_ptr, (H5AC_info_t *)parent_thing, (H5AC_info_t *)child_thing, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_destroy_flush_dependency() */
@@ -1904,17 +1549,11 @@ herr_t
 H5AC_unprotect(H5F_t *f, const H5AC_class_t *type, haddr_t addr, void *thing,
     unsigned flags)
 {
-#if H5AC__TRACE_FILE_ENABLED
-    char                trace[128] = "";
-    FILE *              trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
     hbool_t		dirtied;
     hbool_t		deleted;
 #ifdef H5_HAVE_PARALLEL
     H5AC_aux_t        * aux_ptr = NULL;
 #endif /* H5_HAVE_PARALLEL */
-    hbool_t log_enabled;              /* TRUE if logging was set up */
-    hbool_t curr_logging;             /* TRUE if currently logging */
     herr_t              ret_value=SUCCEED;      /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
@@ -1931,19 +1570,6 @@ H5AC_unprotect(H5F_t *f, const H5AC_class_t *type, haddr_t addr, void *thing,
     HDassert( ((H5AC_info_t *)thing)->addr == addr );
     HDassert( ((H5AC_info_t *)thing)->type == type );
 
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(f->shared->cache, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to get logging status")
-
-#if H5AC__TRACE_FILE_ENABLED
-    /* For the unprotect call, only the addr, type id, flags, and possible
-     * new size are really necessary in the trace file.  Write the return
-     * value to catch occult errors.
-     */
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr(cache_ptr)))
-        sprintf(trace, "%s 0x%lx %d", FUNC, (unsigned long)addr, (int)(type->id));
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     dirtied = (hbool_t)(((flags & H5AC__DIRTIED_FLAG) == H5AC__DIRTIED_FLAG) ||
 		(((H5AC_info_t *)thing)->dirtied));
     deleted = (hbool_t)((flags & H5C__DELETED_FLAG) == H5C__DELETED_FLAG);
@@ -1984,15 +1610,10 @@ H5AC_unprotect(H5F_t *f, const H5AC_class_t *type, haddr_t addr, void *thing,
 #endif /* H5_HAVE_PARALLEL */
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr != NULL)
-	HDfprintf(trace_file_ptr, "%s 0x%x %d\n", trace, (unsigned)flags, (int)ret_value);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_unprotect_entry_log_msg(f->shared->cache, (H5AC_info_t *)thing, type->id, flags, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(f->shared->cache->log_info->logging)
+        if(H5C_log_write_unprotect_entry_msg(f->shared->cache, (H5AC_info_t *)thing, type->id, flags, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_unprotect() */
@@ -2191,12 +1812,6 @@ done:
 herr_t
 H5AC_set_cache_auto_resize_config(H5AC_t *cache_ptr, H5AC_cache_config_t *config_ptr)
 {
-#if H5AC__TRACE_FILE_ENABLED
-    H5AC_cache_config_t trace_config = H5AC__DEFAULT_CACHE_CONFIG;
-    FILE *              trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-    hbool_t log_enabled;                /* TRUE if logging was set up */
-    hbool_t curr_logging;               /* TRUE if currently logging */
     H5C_auto_size_ctl_t internal_config;
     herr_t  ret_value = SUCCEED;      	/* Return value */
 
@@ -2205,18 +1820,6 @@ H5AC_set_cache_auto_resize_config(H5AC_t *cache_ptr, H5AC_cache_config_t *config
     /* Sanity checks */
     HDassert(cache_ptr);
 
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(cache_ptr, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to get logging status")
-
-#if H5AC__TRACE_FILE_ENABLED
-    /* Make note of the new configuration.  Don't look up the trace file
-     * pointer, as that may change before we use it.
-     */
-    if(config_ptr != NULL)
-        trace_config = *config_ptr;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     if(cache_ptr == NULL)
         HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "bad cache_ptr on entry")
 #ifdef H5_HAVE_PARALLEL
@@ -2233,23 +1836,25 @@ H5AC_set_cache_auto_resize_config(H5AC_t *cache_ptr, H5AC_cache_config_t *config
     if(H5AC_validate_config(config_ptr) != SUCCEED)
         HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "Bad cache configuration")
 
-    if(config_ptr->open_trace_file) {
-	FILE * file_ptr;
-
-	if(NULL == (file_ptr = H5C_get_trace_file_ptr(cache_ptr)))
-	    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "H5C_get_trace_file_ptr() failed")
-
-	if((!(config_ptr->close_trace_file)) && (file_ptr != NULL))
-            HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "Trace file already open")
-    } /* end if */
-
-    /* Close & reopen trace file, if requested */
+    /* If the cache config struct is being used to control logging, perform
+     * the open/close operations. Note that this is the only place where the
+     * struct-based control opens and closes the log files so we also have
+     * to write start/stop messages.
+     */
+    /* close */
     if(config_ptr->close_trace_file)
-	if(H5AC__close_trace_file(cache_ptr) < 0)
-            HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "H5AC__close_trace_file() failed")
-    if(config_ptr->open_trace_file)
-        if(H5AC__open_trace_file(cache_ptr, config_ptr->trace_file_name) < 0)
-	    HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "H5AC__open_trace_file() failed")
+        if(H5C_log_tear_down((H5C_t *)cache_ptr) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "mdc logging tear-down failed")
+
+    /* open */
+    if(config_ptr->open_trace_file) {
+        /* Turn on metadata cache logging.
+         * This will be trace output until we create a special API call. JSON
+         * output is generated when logging is controlled by the H5P calls.
+         */
+        if(H5C_log_set_up((H5C_t *)cache_ptr, config_ptr->trace_file_name, H5C_LOG_STYLE_TRACE, TRUE) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "mdc logging setup failed")
+    }
 
     /* Convert external configuration to internal representation */
     if(H5AC__ext_config_2_int_config(config_ptr, &internal_config) < 0)
@@ -2275,52 +1880,10 @@ H5AC_set_cache_auto_resize_config(H5AC_t *cache_ptr, H5AC_cache_config_t *config
 #endif /* H5_HAVE_PARALLEL */
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    /* For the set cache auto resize config call, only the contents
-     * of the config is necessary in the trace file. Write the return
-     * value to catch occult errors.
-     */
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr(cache_ptr)))
-	HDfprintf(trace_file_ptr,
-                  "%s %d %d %d %d \"%s\" %d %d %d %f %d %d %ld %d %f %f %d %f %f %d %d %d %f %f %d %d %d %d %f %zu %d %d\n",
-		  "H5AC_set_cache_auto_resize_config",
-		  trace_config.version,
-		  (int)(trace_config.rpt_fcn_enabled),
-		  (int)(trace_config.open_trace_file),
-		  (int)(trace_config.close_trace_file),
-		  trace_config.trace_file_name,
-		  (int)(trace_config.evictions_enabled),
-		  (int)(trace_config.set_initial_size),
-		  (int)(trace_config.initial_size),
-		  trace_config.min_clean_fraction,
-		  (int)(trace_config.max_size),
-		  (int)(trace_config.min_size),
-		  trace_config.epoch_length,
-		  (int)(trace_config.incr_mode),
-		  trace_config.lower_hr_threshold,
-		  trace_config.increment,
-		  (int)(trace_config.flash_incr_mode),
-		  trace_config.flash_multiple,
-		  trace_config.flash_threshold,
-		  (int)(trace_config.apply_max_increment),
-		  (int)(trace_config.max_increment),
-		  (int)(trace_config.decr_mode),
-		  trace_config.upper_hr_threshold,
-		  trace_config.decrement,
-		  (int)(trace_config.apply_max_decrement),
-		  (int)(trace_config.max_decrement),
-		  trace_config.epochs_before_eviction,
-		  (int)(trace_config.apply_empty_reserve),
-		  trace_config.empty_reserve,
-		  trace_config.dirty_bytes_threshold,
-		  trace_config.metadata_write_strategy,
-		  (int)ret_value);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_set_cache_config_log_msg(cache_ptr, config_ptr, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(cache_ptr->log_info->logging)
+        if(H5C_log_write_set_cache_config_msg(cache_ptr, config_ptr, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_set_cache_auto_resize_config() */
@@ -2366,12 +1929,12 @@ H5AC_validate_config(H5AC_cache_config_t *config_ptr)
     if(config_ptr->open_trace_file) {
         size_t	        name_len;
 
-	/* Can't really test the trace_file_name field without trying to
-	 * open the file, so we will content ourselves with a couple of
-	 * sanity checks on the length of the file name.
-	 */
-	name_len = HDstrlen(config_ptr->trace_file_name);
-	if(name_len == 0)
+        /* Can't really test the trace_file_name field without trying to
+         * open the file, so we will content ourselves with a couple of
+         * sanity checks on the length of the file name.
+         */
+        name_len = HDstrlen(config_ptr->trace_file_name);
+        if(name_len == 0)
             HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "config_ptr->trace_file_name is empty")
         else if(name_len > H5AC__MAX_TRACE_FILE_NAME_LEN)
             HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "config_ptr->trace_file_name too long")
@@ -3062,12 +2625,6 @@ H5AC_remove_entry(void *_entry)
 {
     H5AC_info_t *entry = (H5AC_info_t *)_entry; /* Entry to remove */
     H5C_t *cache = NULL;                /* Pointer to the entry's associated metadata cache */
-#if H5AC__TRACE_FILE_ENABLED
-    char                trace[128] = "";
-    FILE *              trace_file_ptr = NULL;
-#endif /* H5AC__TRACE_FILE_ENABLED */
-    hbool_t log_enabled;                /* TRUE if logging was set up */
-    hbool_t curr_logging;               /* TRUE if currently logging */
     herr_t ret_value = SUCCEED;         /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
@@ -3077,32 +2634,15 @@ H5AC_remove_entry(void *_entry)
     cache = entry->cache_ptr;
     HDassert(cache);
 
-#if H5AC__TRACE_FILE_ENABLED
-    /* For the remove entry call, only the addr is really necessary
-     * in the trace file.  Also write the result to catch occult errors.
-     */
-    if(NULL != (trace_file_ptr = H5C_get_trace_file_ptr_from_entry(entry)))
-        sprintf(trace, "%s 0x%lx", FUNC, (unsigned long)(entry->addr));
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(cache, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_CANTGET, FAIL, "unable to get logging status")
-
     /* Remove the entry from the cache*/
     if(H5C_remove_entry(entry) < 0)
         HGOTO_ERROR(H5E_CACHE, H5E_CANTREMOVE, FAIL, "can't remove entry")
 
 done:
-#if H5AC__TRACE_FILE_ENABLED
-    if(trace_file_ptr)
-	HDfprintf(trace_file_ptr, "%s %d\n", trace, (int)ret_value);
-#endif /* H5AC__TRACE_FILE_ENABLED */
-
     /* If currently logging, generate a message */
-    if(curr_logging)
-        if(H5AC__write_remove_entry_log_msg(cache, entry, ret_value) < 0)
-            HDONE_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to emit log message")
+    if(cache->log_info->logging)
+        if(H5C_log_write_remove_entry_msg(cache, entry, ret_value) < 0)
+            HDONE_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* H5AC_remove_entry() */
diff --git a/src/H5ACdbg.c b/src/H5ACdbg.c
index c6d71a8..1235206 100644
--- a/src/H5ACdbg.c
+++ b/src/H5ACdbg.c
@@ -136,121 +136,6 @@ done:
 
 
 /*-------------------------------------------------------------------------
- * Function:    H5AC__close_trace_file()
- *
- * Purpose:     If a trace file is open, stop logging calls to the cache,
- *              and close the file.
- *
- *              Note that the function does nothing if there is no trace
- *              file.
- *
- * Return:      Non-negative on success/Negative on failure
- *
- * Programmer:  John Mainzer
- *              6/2/06
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__close_trace_file(H5AC_t *cache_ptr)
-{
-    FILE *   trace_file_ptr;
-    herr_t   ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_PACKAGE
-
-    if(cache_ptr == NULL)
-        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "NULL cache_ptr on entry.")
-
-    if(NULL == (trace_file_ptr = H5C_get_trace_file_ptr(cache_ptr)))
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "H5C_get_trace_file_ptr() failed.")
-
-    if(trace_file_ptr != NULL) {
-        if(H5C_set_trace_file_ptr(cache_ptr, NULL) < 0)
-            HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "H5C_set_trace_file_ptr() failed.")
-
-        if(HDfclose(trace_file_ptr) != 0)
-            HGOTO_ERROR(H5E_FILE, H5E_CANTCLOSEFILE, FAIL, "can't close metadata cache trace file")
-    } /* end if */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__close_trace_file() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__open_trace_file()
- *
- * Purpose:     Open a trace file, and start logging calls to the cache.
- *
- * 		This logging is done at the H5C level, and will only take
- * 		place if H5C_TRACE_FILE_ENABLED (defined in H5Cprivate.h)
- * 		is TRUE.
- *
- * Return:      Non-negative on success/Negative on failure
- *
- * Programmer:  John Mainzer
- *              6/1/06
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__open_trace_file(H5AC_t *cache_ptr, const char *trace_file_name)
-{
-    char     file_name[H5AC__MAX_TRACE_FILE_NAME_LEN + H5C__PREFIX_LEN + 2];
-    FILE *   file_ptr;
-    herr_t   ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_PACKAGE
-
-    HDassert(cache_ptr);
-
-    /* Check args */
-    if(cache_ptr == NULL)
-        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "cache_ptr NULL on entry.")
-    if(trace_file_name == NULL)
-        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "NULL trace_file_name on entry.")
-    if(HDstrlen(trace_file_name) > H5AC__MAX_TRACE_FILE_NAME_LEN)
-        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "trace file name too long.")
-    if(NULL != (file_ptr = H5C_get_trace_file_ptr(cache_ptr)))
-        HGOTO_ERROR(H5E_CACHE, H5E_FILEOPEN, FAIL, "trace file already open.")
-
-#ifdef H5_HAVE_PARALLEL
-{
-    H5AC_aux_t * aux_ptr;
-
-    aux_ptr = (H5AC_aux_t *)H5C_get_aux_ptr(cache_ptr);
-    if(aux_ptr == NULL)
-        sprintf(file_name, "%s", trace_file_name);
-    else {
-	if(aux_ptr->magic != H5AC__H5AC_AUX_T_MAGIC)
-            HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad aux_ptr->magic.")
-
-        sprintf(file_name, "%s.%d", trace_file_name, aux_ptr->mpi_rank);
-    } /* end else */
-
-    if(HDstrlen(file_name) > H5AC__MAX_TRACE_FILE_NAME_LEN + H5C__PREFIX_LEN + 1)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "cooked trace file name too long.")
-}
-#else /* H5_HAVE_PARALLEL */
-    HDsnprintf(file_name, (size_t)(H5AC__MAX_TRACE_FILE_NAME_LEN + H5C__PREFIX_LEN + 1), 
-               "%s", trace_file_name);
-#endif /* H5_HAVE_PARALLEL */
-
-    if((file_ptr = HDfopen(file_name, "w")) == NULL)
-        HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, FAIL, "trace file open failed.")
-
-    HDfprintf(file_ptr, "### HDF5 metadata cache trace file version 1 ###\n");
-
-    if(H5C_set_trace_file_ptr(cache_ptr, file_ptr) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "H5C_set_trace_file_ptr() failed.")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__open_trace_file() */
-
-
-/*-------------------------------------------------------------------------
  *
  * Function:    H5AC_get_entry_ptr_from_addr()
  *
diff --git a/src/H5AClog.c b/src/H5AClog.c
deleted file mode 100644
index 51a2050..0000000
--- a/src/H5AClog.c
+++ /dev/null
@@ -1,1105 +0,0 @@
-/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- * Copyright by The HDF Group.                                               *
- * Copyright by the Board of Trustees of the University of Illinois.         *
- * All rights reserved.                                                      *
- *                                                                           *
- * This file is part of HDF5.  The full HDF5 copyright notice, including     *
- * terms governing use, modification, and redistribution, is contained in    *
- * the COPYING file, which can be found at the root of the source code       *
- * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
- * If you do not have access to either file, you may request a copy from     *
- * help@hdfgroup.org.                                                        *
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
-
-/*-------------------------------------------------------------------------
- *
- * Created:             H5AClog.c
- *
- * Purpose:             Functions for metadata cache logging in JSON format
- *
- *-------------------------------------------------------------------------
- */
-
-/****************/
-/* Module Setup */
-/****************/
-#include "H5ACmodule.h"         /* This source code file is part of the H5AC module */
-
-/***********/
-/* Headers */
-/***********/
-#include "H5private.h"          /* Generic Functions                    */
-#include "H5ACpkg.h"            /* Metadata cache                       */
-#include "H5Cprivate.h"		/* Cache                                */
-#include "H5Eprivate.h"         /* Error handling                       */
-
-
-/****************/
-/* Local Macros */
-/****************/
-
-#define MSG_SIZE 128
-
-
-/******************/
-/* Local Typedefs */
-/******************/
-
-
-/********************/
-/* Package Typedefs */
-/********************/
-
-
-/********************/
-/* Local Prototypes */
-/********************/
-
-
-/*********************/
-/* Package Variables */
-/*********************/
-
-
-/*****************************/
-/* Library Private Variables */
-/*****************************/
-
-
-/*******************/
-/* Local Variables */
-/*******************/
-
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_create_cache_log_msg
- *
- * Purpose:     Write a log message for cache creation.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_create_cache_log_msg(H5AC_t *cache) 
-{
-    char msg[MSG_SIZE];
-    hbool_t log_enabled;                /* TRUE if logging was set up */
-    hbool_t curr_logging;               /* TRUE if currently logging */
-    herr_t ret_value = SUCCEED;         /* Return value */
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(cache, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to get logging status")
-
-    /* Since we're about to override the current logging flag,
-     * check the "log enabled" flag to see if we didn't get here
-     * by mistake.
-     */
-    if(!log_enabled)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "attempt to write opening log message when logging is disabled")
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\n\
-\"create_time\":%lld,\n\
-\"messages\":\n\
-[\n\
-"
-    , (long long)HDtime(NULL));
-
-    /* Have to temporarily enable logging, if it isn't currently  */
-    if(!curr_logging)
-        if(H5C_start_logging(cache) < 0)
-            HGOTO_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to start mdc logging")
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-    /* Stop logging, if it wasn't started originally */
-    if(!curr_logging)
-        if(H5C_stop_logging(cache) < 0)
-            HGOTO_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to stop mdc logging")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_create_cache_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_destroy_cache_log_msg
- *
- * Purpose:     Write a log message for cache destruction.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_destroy_cache_log_msg(H5AC_t *cache)
-{
-    char msg[MSG_SIZE];
-    hbool_t log_enabled;                /* TRUE if logging was set up */
-    hbool_t curr_logging;               /* TRUE if currently logging */
-    herr_t ret_value = SUCCEED;         /* Return value */
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-
-    /* Check if log messages are being emitted */
-    if(H5C_get_logging_status(cache, &log_enabled, &curr_logging) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to get logging status")
-
-    /* Since we're about to override the current logging flag,
-     * check the "log enabled" flag to see if we didn't get here
-     * by mistake.
-     */
-    if(!log_enabled)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "attempt to write closing log message when logging is disabled")
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-],\n\
-\"close_time\":%lld,\n\
-}\n\
-"
-    , (long long)HDtime(NULL));
-
-    /* Have to temporarily enable logging, if it isn't currently  */
-    if(!curr_logging)
-        if(H5C_start_logging(cache) < 0)
-            HGOTO_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to start mdc logging")
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-    /* Stop logging, if it wasn't started originally */
-    if(!curr_logging)
-        if(H5C_stop_logging(cache) < 0)
-            HGOTO_ERROR(H5E_CACHE, H5E_LOGFAIL, FAIL, "unable to stop mdc logging")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_destroy_cache_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_evict_cache_log_msg
- *
- * Purpose:     Write a log message for eviction of cache entries.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_evict_cache_log_msg(const H5AC_t *cache,
-                                herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];
-    herr_t ret_value = SUCCEED;
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"evict\",\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (int)fxn_ret_value);
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_evict_cache_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_expunge_entry_log_msg
- *
- * Purpose:     Write a log message for expunge of cache entries.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_expunge_entry_log_msg(const H5AC_t *cache,
-                                  haddr_t address,
-                                  int type_id,
-                                  herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];
-    herr_t ret_value = SUCCEED;
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"expunge\",\
-\"address\":0x%lx,\
-\"type_id\":%d,\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (unsigned long)address, (int)type_id, (int)fxn_ret_value);
-
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_expunge_entry_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_flush_cache_log_msg
- *
- * Purpose:     Write a log message for cache flushes.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_flush_cache_log_msg(const H5AC_t *cache,
-                                herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];
-    herr_t ret_value = SUCCEED;
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"flush\",\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (int)fxn_ret_value);
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_flush_cache_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_insert_entry_log_msg
- *
- * Purpose:     Write a log message for insertion of cache entries.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_insert_entry_log_msg(const H5AC_t *cache,
-                                 haddr_t address,
-                                 int type_id,
-                                 unsigned flags,
-                                 size_t size,
-                                 herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];
-    herr_t ret_value = SUCCEED;
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"insert\",\
-\"address\":0x%lx,\
-\"flags\":0x%x,\
-\"type_id\":%d,\
-\"size\":%d,\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (unsigned long)address, flags, type_id, 
-      (int)size, (int)fxn_ret_value);
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_insert_entry_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_mark_dirty_entry_log_msg
- *
- * Purpose:     Write a log message for marking cache entries as dirty.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_mark_dirty_entry_log_msg(const H5AC_t *cache,
-                                     const H5AC_info_t *entry,
-                                     herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];
-    herr_t ret_value = SUCCEED;
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-    HDassert(entry);
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"dirty\",\
-\"address\":0x%lx,\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_mark_dirty_entry_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_mark_clean_entry_log_msg
- *
- * Purpose:     Write a log message for marking cache entries as clean.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Quincey Koziol
- *              Saturday, July 23, 2016
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_mark_clean_entry_log_msg(const H5AC_t *cache, const H5AC_info_t *entry,
-    herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];                 /* Log message buffer */
-    herr_t ret_value = SUCCEED;         /* Return value */
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-    HDassert(entry);
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"clean\",\
-\"address\":0x%lx,\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_mark_clean_entry_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_mark_unserialized_entry_log_msg
- *
- * Purpose:     Write a log message for marking cache entries as unserialized.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Quincey Koziol
- *              Thursday, December 22, 2016
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_mark_unserialized_entry_log_msg(const H5AC_t *cache,
-                                     const H5AC_info_t *entry,
-                                     herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];
-    herr_t ret_value = SUCCEED;
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-    HDassert(entry);
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"unserialized\",\
-\"address\":0x%lx,\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_mark_unserialized_entry_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_mark_serialize_entry_log_msg
- *
- * Purpose:     Write a log message for marking cache entries as serialize.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Quincey Koziol
- *              Thursday, December 22, 2016
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_mark_serialized_entry_log_msg(const H5AC_t *cache, const H5AC_info_t *entry,
-    herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];                 /* Log message buffer */
-    herr_t ret_value = SUCCEED;         /* Return value */
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-    HDassert(entry);
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"serialized\",\
-\"address\":0x%lx,\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_mark_serialized_entry_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_move_entry_log_msg
- *
- * Purpose:     Write a log message for moving a cache entry.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_move_entry_log_msg(const H5AC_t *cache,
-                               haddr_t old_addr,
-                               haddr_t new_addr,
-                               int type_id,
-                               herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];
-    herr_t ret_value = SUCCEED;
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"move\",\
-\"old_address\":0x%lx,\
-\"new_address\":0x%lx,\
-\"type_id\":%d,\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (unsigned long)old_addr, 
-      (unsigned long)new_addr, type_id, (int)fxn_ret_value);
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_move_entry_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_pin_entry_log_msg
- *
- * Purpose:     Write a log message for pinning a cache entry.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_pin_entry_log_msg(const H5AC_t *cache,
-                              const H5AC_info_t *entry,
-                              herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];
-    herr_t ret_value = SUCCEED;
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-    HDassert(entry);
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"pin\",\
-\"address\":0x%lx,\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
-      (int)fxn_ret_value);
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_pin_entry_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_create_fd_log_msg
- *
- * Purpose:     Write a log message for creating a flush dependency between
- *              two cache entries.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_create_fd_log_msg(const H5AC_t *cache,
-                              const H5AC_info_t *parent,
-                              const H5AC_info_t *child,
-                              herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];
-    herr_t ret_value = SUCCEED;
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-    HDassert(parent);
-    HDassert(child);
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"create_fd\",\
-\"parent_addr\":0x%lx,\
-\"child_addr\":0x%lx,\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (unsigned long)parent->addr, 
-      (unsigned long)child->addr, (int)fxn_ret_value);
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_create_fd_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_protect_entry_log_msg
- *
- * Purpose:     Write a log message for protecting a cache entry.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_protect_entry_log_msg(const H5AC_t *cache,
-                                  const H5AC_info_t *entry,
-                                  unsigned flags,
-                                  herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];
-    char rw_s[16];
-    herr_t ret_value = SUCCEED;
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-    HDassert(entry);
-
-    if(H5AC__READ_ONLY_FLAG == flags)
-        HDstrcpy(rw_s, "READ");
-    else 
-        HDstrcpy(rw_s, "WRITE");
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"protect\",\
-\"address\":0x%lx,\
-\"readwrite\":\"%s\",\
-\"size\":%d,\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
-      rw_s, (int)entry->size, (int)fxn_ret_value);
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_protect_entry_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_resize_entry_log_msg
- *
- * Purpose:     Write a log message for resizing a cache entry.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_resize_entry_log_msg(const H5AC_t *cache,
-                                 const H5AC_info_t *entry,
-                                 size_t new_size,
-                                 herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];
-    herr_t ret_value = SUCCEED;
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-    HDassert(entry);
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"resize\",\
-\"address\":0x%lx,\
-\"new_size\":%d,\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
-      (int)new_size, (int)fxn_ret_value);
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_resize_entry_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_unpin_entry_log_msg
- *
- * Purpose:     Write a log message for unpinning a cache entry.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_unpin_entry_log_msg(const H5AC_t *cache,
-                                const H5AC_info_t *entry,
-                                herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];
-    herr_t ret_value = SUCCEED;
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-    HDassert(entry);
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"unpin\",\
-\"address\":0x%lx,\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
-      (int)fxn_ret_value);
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_unpin_entry_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_destroy_fd_log_msg
- *
- * Purpose:     Write a log message for destroying a flush dependency
- *              between two cache entries.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_destroy_fd_log_msg(const H5AC_t *cache,
-                               const H5AC_info_t *parent,
-                               const H5AC_info_t *child,
-                               herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];
-    herr_t ret_value = SUCCEED;
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-    HDassert(parent);
-    HDassert(child);
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"destroy_fd\",\
-\"parent_addr\":0x%lx,\
-\"child_addr\":0x%lx,\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (unsigned long)parent->addr, 
-      (unsigned long)child->addr, (int)fxn_ret_value);
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_destroy_fd_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_unprotect_entry_log_msg
- *
- * Purpose:     Write a log message for unprotecting a cache entry.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_unprotect_entry_log_msg(const H5AC_t *cache,
-                                    const H5AC_info_t *entry,
-                                    int type_id,
-                                    unsigned flags,
-                                    herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];
-    herr_t ret_value = SUCCEED;
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-    HDassert(entry);
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"unprotect\",\
-\"address\":0x%lx,\
-\"id\":%d,\
-\"flags\":%x,\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
-      type_id, flags, (int)fxn_ret_value);
-
-    HDsnprintf(msg, MSG_SIZE, " ");
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_unprotect_entry_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_set_cache_config_log_msg
- *
- * Purpose:     Write a log message for setting the cache configuration.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_set_cache_config_log_msg(const H5AC_t *cache,
-                                     const H5AC_cache_config_t *config,
-                                     herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];
-    herr_t ret_value = SUCCEED;
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-    HDassert(config);
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"set_config\",\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (int)fxn_ret_value);
-
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_set_cache_config_log_msg() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5AC__write_remove_entry_log_msg
- *
- * Purpose:     Write a log message for removing a cache entry.
- *
- * Return:      Success:        SUCCEED
- *              Failure:        FAIL
- *
- * Programmer:  Quincey Koziol
- *              September 17, 2016
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5AC__write_remove_entry_log_msg(const H5AC_t *cache, const H5AC_info_t *entry,
-    herr_t fxn_ret_value)
-{
-    char msg[MSG_SIZE];
-    herr_t ret_value = SUCCEED;
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* Sanity checks */
-    HDassert(cache);
-    HDassert(entry);
-
-    /* Create the log message string */
-    HDsnprintf(msg, MSG_SIZE, 
-"\
-{\
-\"timestamp\":%lld,\
-\"action\":\"remove\",\
-\"address\":0x%lx,\
-\"returned\":%d\
-},\n\
-"
-    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
-      (int)fxn_ret_value);
-
-    /* Write the log message to the file */
-    if(H5C_write_log_message(cache, msg) < 0)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unable to emit log message")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5AC__write_remove_entry_log_msg() */
-
diff --git a/src/H5ACpkg.h b/src/H5ACpkg.h
index 9bf84bf..8997382 100644
--- a/src/H5ACpkg.h
+++ b/src/H5ACpkg.h
@@ -433,74 +433,5 @@ H5_DLL herr_t H5AC__set_write_done_callback(H5C_t * cache_ptr,
     void (* write_done)(void));
 #endif /* H5_HAVE_PARALLEL */
 
-/* Trace file routines */
-H5_DLL herr_t H5AC__close_trace_file(H5AC_t *cache_ptr);
-H5_DLL herr_t H5AC__open_trace_file(H5AC_t *cache_ptr, const char *trace_file_name);
-
-/* Cache logging routines */
-H5_DLL herr_t H5AC__write_create_cache_log_msg(H5AC_t *cache);
-H5_DLL herr_t H5AC__write_destroy_cache_log_msg(H5AC_t *cache);
-H5_DLL herr_t H5AC__write_evict_cache_log_msg(const H5AC_t *cache,
-                                        herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_expunge_entry_log_msg(const H5AC_t *cache,
-                                                haddr_t address,
-                                                int type_id,
-                                                herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_flush_cache_log_msg(const H5AC_t *cache,
-                                              herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_insert_entry_log_msg(const H5AC_t *cache,
-                                               haddr_t address,
-                                               int type_id,
-                                               unsigned flags,
-                                               size_t size,
-                                               herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_mark_dirty_entry_log_msg(const H5AC_t *cache,
-                                                   const H5AC_info_t *entry,
-                                                   herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_mark_clean_entry_log_msg(const H5AC_t *cache,
-    const H5AC_info_t *entry, herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_mark_unserialized_entry_log_msg(const H5AC_t *cache,
-        const H5AC_info_t *entry, herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_mark_serialized_entry_log_msg(const H5AC_t *cache,
-    const H5AC_info_t *entry, herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_move_entry_log_msg(const H5AC_t *cache,
-                                             haddr_t old_addr,
-                                             haddr_t new_addr,
-                                             int type_id,
-                                             herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_pin_entry_log_msg(const H5AC_t *cache,
-                                            const H5AC_info_t *entry,
-                                            herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_create_fd_log_msg(const H5AC_t *cache,
-                                            const H5AC_info_t *parent,
-                                            const H5AC_info_t *child,
-                                            herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_protect_entry_log_msg(const H5AC_t *cache,
-                                                const H5AC_info_t *entry,
-                                                unsigned flags,
-                                                herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_resize_entry_log_msg(const H5AC_t *cache,
-                                               const H5AC_info_t *entry,
-                                               size_t new_size,
-                                               herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_unpin_entry_log_msg(const H5AC_t *cache,
-                                              const H5AC_info_t *entry,
-                                              herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_destroy_fd_log_msg(const H5AC_t *cache,
-                                             const H5AC_info_t *parent,
-                                             const H5AC_info_t *child,
-                                             herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_unprotect_entry_log_msg(const H5AC_t *cache,
-                                                  const H5AC_info_t *entry,
-                                                  int type_id,
-                                                  unsigned flags,
-                                                  herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_set_cache_config_log_msg(const H5AC_t *cache,
-                                                   const H5AC_cache_config_t *config,
-                                                   herr_t fxn_ret_value);
-H5_DLL herr_t H5AC__write_remove_entry_log_msg(const H5AC_t *cache,
-                                              const H5AC_info_t *entry,
-                                              herr_t fxn_ret_value);
-
 #endif /* _H5ACpkg_H */
 
diff --git a/src/H5ACprivate.h b/src/H5ACprivate.h
index 0e8620d..e1fdedf 100644
--- a/src/H5ACprivate.h
+++ b/src/H5ACprivate.h
@@ -35,12 +35,6 @@
 #include "H5Pprivate.h"		/* Property lists			*/
 #include "H5SLprivate.h"        /* Skip lists 				*/
 
-#ifdef H5_METADATA_TRACE_FILE
-#define H5AC__TRACE_FILE_ENABLED	1
-#else /* H5_METADATA_TRACE_FILE */
-#define H5AC__TRACE_FILE_ENABLED	0
-#endif /* H5_METADATA_TRACE_FILE */
-
 /* Global metadata tag values */
 #define H5AC__INVALID_TAG      (haddr_t)0
 #define H5AC__IGNORE_TAG       (haddr_t)1
diff --git a/src/H5Adense.c b/src/H5Adense.c
index 5bed82d..021fa76 100644
--- a/src/H5Adense.c
+++ b/src/H5Adense.c
@@ -300,18 +300,49 @@ static herr_t
 H5A__dense_fnd_cb(const H5A_t *attr, hbool_t *took_ownership, void *_user_attr)
 {
     H5A_t const **user_attr = (H5A_t const **)_user_attr; /* User data from v2 B-tree attribute lookup */
+    herr_t ret_value = SUCCEED;         /* Return value */
 
-    FUNC_ENTER_STATIC_NOERR
+    FUNC_ENTER_STATIC
 
     /* Check arguments */
     HDassert(attr);
     HDassert(user_attr);
+    HDassert(took_ownership);
+    /*
+     *  If there is an attribute already stored in "user_attr", 
+     *  we need to free the dynamially allocated spaces for the 
+     *  attribute, otherwise we got infinite loop closing library due to 
+     *  outstanding allocation. (HDFFV-10659)
+     *
+     *  This callback is used by H5A__dense_remove() to close/free the
+     *  attribute stored in "user_attr" (via H5O__msg_free_real()) after
+     *  the attribute node is deleted from the name index v2 B-tree.
+     *  The issue is: 
+     *      When deleting the attribute node from the B-tree, 
+     *      if the attribute is found in the intermediate B-tree nodes, 
+     *      which may be merged/redistributed, we need to free the dynamically
+     *      allocated spaces for the intermediate decoded attribute.
+     */
+    if(*user_attr != NULL) {
+        H5A_t *old_attr = *user_attr;
+        if(old_attr->shared) {
+            /* Free any dynamically allocated items */
+            if(H5A__free(old_attr) < 0)
+                HGOTO_ERROR(H5E_ATTR, H5E_CANTRELEASE, FAIL, "can't release attribute info")
+
+            /* Destroy shared attribute struct */
+            old_attr->shared = H5FL_FREE(H5A_shared_t, old_attr->shared);
+        } /* end if */
+
+        old_attr = H5FL_FREE(H5A_t, old_attr);
+     } /* end if */
 
     /* Take over attribute ownership */
     *user_attr = attr;
     *took_ownership = TRUE;
 
-    FUNC_LEAVE_NOAPI(SUCCEED)
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5A__dense_fnd_cb() */
 
 
diff --git a/src/H5Adeprec.c b/src/H5Adeprec.c
index b43e41d..b438cd2 100644
--- a/src/H5Adeprec.c
+++ b/src/H5Adeprec.c
@@ -45,6 +45,8 @@
 #include "H5Opkg.h"             /* Object headers                           */
 #include "H5VLprivate.h"        /* Virtual object layer                     */
 
+#include "H5VLnative_private.h" /* Native VOL connector                     */
+
 
 /****************/
 /* Local Macros */
@@ -343,7 +345,7 @@ H5Aget_num_attrs(hid_t loc_id)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, (-1), "invalid location identifier")
 
     /* Get the number of attributes for the object */
-    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_OBJECT_GET_INFO, &loc_params, &oinfo, H5O_INFO_ALL) < 0)
+    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_OBJECT_GET_INFO, &loc_params, &oinfo, H5O_INFO_ALL) < 0)
         HGOTO_ERROR(H5E_ATTR, H5E_CANTGET, (-1), "unable to get attribute count for object")
 
     H5_CHECKED_ASSIGN(ret_value, int, oinfo.num_attrs, hsize_t);
@@ -408,7 +410,7 @@ H5Aiterate1(hid_t loc_id, unsigned *attr_num, H5A_operator1_t op, void *op_data)
         HGOTO_ERROR(H5E_VOL, H5E_BADTYPE, H5_ITER_ERROR, "invalid location identifier")
 
     /* Call attribute iteration routine */
-    if((ret_value = H5VL_attr_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_ATTR_ITERATE_OLD, loc_id, attr_num, op, op_data)) < 0)
+    if((ret_value = H5VL_attr_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_ATTR_ITERATE_OLD, loc_id, attr_num, op, op_data)) < 0)
         HERROR(H5E_VOL, H5E_BADITER, "error iterating over attributes");
 
 done:
diff --git a/src/H5Apkg.h b/src/H5Apkg.h
index cfe9dae..91061cd 100644
--- a/src/H5Apkg.h
+++ b/src/H5Apkg.h
@@ -155,21 +155,6 @@ typedef struct {
     H5A_t       **attrs;        /* Pointer to array of attribute pointers */
 } H5A_attr_table_t;
 
-/* Types for optional attribute VOL operations */
-typedef enum H5VL_attr_optional_t {
-    H5VL_ATTR_ITERATE_OLD               /* H5Aiterate (deprecated routine) */
-                                        /* (This enum value should have an
-                                         *      "#ifndefH5_NO_DEPRECATED_SYMBOLS"
-                                         *      around it, but the compiler
-                                         *      complains about an empty enum
-                                         *      when deprecated symbols are
-                                         *      disabled currently.  When
-                                         *      another enum value is added,
-                                         *      please put the #ifdef around
-                                         *      this symbol.  QAK - 2018/12/06
-                                         */
-} H5VL_attr_optional_t;
-
 
 /*****************************/
 /* Package Private Variables */
diff --git a/src/H5Apublic.h b/src/H5Apublic.h
index 586940b..7162f6e 100644
--- a/src/H5Apublic.h
+++ b/src/H5Apublic.h
@@ -22,10 +22,6 @@
 #include "H5Opublic.h"		/* Object Headers			*/
 #include "H5Tpublic.h"		/* Datatypes				*/
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /* Information struct for attribute (for H5Aget_info/H5Aget_info_by_idx) */
 typedef struct {
     hbool_t             corder_valid;   /* Indicate if creation order is valid */
@@ -38,7 +34,19 @@ typedef struct {
 typedef herr_t (*H5A_operator2_t)(hid_t location_id/*in*/,
     const char *attr_name/*in*/, const H5A_info_t *ainfo/*in*/, void *op_data/*in,out*/);
 
-/* Public function prototypes */
+
+/********************/
+/* Public Variables */
+/********************/
+
+
+/*********************/
+/* Public Prototypes */
+/*********************/
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 H5_DLL hid_t   H5Acreate2(hid_t loc_id, const char *attr_name, hid_t type_id,
     hid_t space_id, hid_t acpl_id, hid_t aapl_id);
 H5_DLL hid_t   H5Acreate_by_name(hid_t loc_id, const char *obj_name, const char *attr_name,
diff --git a/src/H5C.c b/src/H5C.c
index a22eca0..b5dc6a5 100644
--- a/src/H5C.c
+++ b/src/H5C.c
@@ -282,13 +282,8 @@ H5C_create(size_t		      max_cache_size,
 
     cache_ptr->flush_in_progress		= FALSE;
 
-    cache_ptr->logging_enabled                  = FALSE;
-
-    cache_ptr->currently_logging                = FALSE;
-
-    cache_ptr->log_file_ptr			= NULL;
-
-    cache_ptr->trace_file_ptr			= NULL;
+    if(NULL == (cache_ptr->log_info = (H5C_log_info_t *)H5MM_calloc(sizeof(H5C_log_info_t))))
+        HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, NULL, "memory allocation failed")
 
     cache_ptr->aux_ptr				= aux_ptr;
 
@@ -493,6 +488,9 @@ done:
             if(cache_ptr->tag_list != NULL)
                 H5SL_close(cache_ptr->tag_list);
 
+            if(cache_ptr->log_info != NULL)
+                H5MM_xfree(cache_ptr->log_info);
+
             cache_ptr->magic = 0;
             cache_ptr = H5FL_FREE(H5C_t, cache_ptr);
         } /* end if */
@@ -865,6 +863,9 @@ H5C_dest(H5F_t * f)
         cache_ptr->tag_list = NULL;
     } /* end if */
 
+    if(cache_ptr->log_info != NULL)
+        H5MM_xfree(cache_ptr->log_info);
+
 #ifndef NDEBUG
 #if H5C_DO_SANITY_CHECKS
     if(cache_ptr->get_entry_ptr_from_addr_counter > 0)
diff --git a/src/H5CX.c b/src/H5CX.c
index 1d9cf3d..0d20132 100644
--- a/src/H5CX.c
+++ b/src/H5CX.c
@@ -198,6 +198,7 @@ typedef struct H5CX_t {
     MPI_Datatype btype;         /* MPI datatype for buffer, when using collective I/O */
     MPI_Datatype ftype;         /* MPI datatype for file, when using collective I/O */
     hbool_t mpi_file_flushing;  /* Whether an MPI-opened file is being flushed */
+    hbool_t rank0_bcast;        /* Whether a dataset meets read-with-rank0-and-bcast requirements */
 #endif /* H5_HAVE_PARALLEL */
 
     /* Cached DXPL properties */
@@ -261,6 +262,8 @@ typedef struct H5CX_t {
     hbool_t mpio_coll_chunk_multi_ratio_coll_set; /* Whether instrumented "collective chunk multi ratio coll" value is set */
     int mpio_coll_chunk_multi_ratio_ind;  /* Instrumented "collective chunk multi ratio ind" value (H5D_XFER_COLL_CHUNK_MULTI_RATIO_IND_NAME) */
     hbool_t mpio_coll_chunk_multi_ratio_ind_set; /* Whether instrumented "collective chunk multi ratio ind" value is set */
+    hbool_t mpio_coll_rank0_bcast;  /* Instrumented "collective chunk multi ratio ind" value (H5D_XFER_COLL_CHUNK_MULTI_RATIO_IND_NAME) */
+    hbool_t mpio_coll_rank0_bcast_set; /* Whether instrumented "collective chunk multi ratio ind" value is set */
 #endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
 #endif /* H5_HAVE_PARALLEL */
 
@@ -268,9 +271,11 @@ typedef struct H5CX_t {
     size_t nlinks;              /* Number of soft / UD links to traverse (H5L_ACS_NLINKS_NAME) */
     hbool_t nlinks_valid;       /* Whether number of soft / UD links to traverse is valid */
 
-    /* Cached VOL properties */
-    void *vol_wrap_ctx;         /* VOL plugin's "wrap context" for creating IDs */
-    hbool_t vol_wrap_ctx_valid; /* Whether VOL plugin's "wrap context" for creating IDs is valid */
+    /* Cached VOL settings */
+    H5VL_connector_prop_t vol_connector_prop;  /* Property for VOL connector ID & info */
+    hbool_t vol_connector_prop_valid; /* Whether property for VOL connector ID & info is valid */
+    void *vol_wrap_ctx;         /* VOL connector's "wrap context" for creating IDs */
+    hbool_t vol_wrap_ctx_valid; /* Whether VOL connector's "wrap context" for creating IDs is valid */
 } H5CX_t;
 
 /* Typedef for nodes on the API context stack */
@@ -956,6 +961,40 @@ done:
 
 
 /*-------------------------------------------------------------------------
+ * Function:    H5CX_set_vol_connector_prop
+ *
+ * Purpose:     Sets the VOL connector ID & info for an operation.
+ *
+ * Return:      Non-negative on success / Negative on failure
+ *
+ * Programmer:  Quincey Koziol
+ *              January 3, 2019
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5CX_set_vol_connector_prop(const H5VL_connector_prop_t *vol_connector_prop)
+{
+    H5CX_node_t **head = H5CX_get_my_context();  /* Get the pointer to the head of the API context, for this thread */
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity check */
+    HDassert(head && *head);
+
+    /* Set the API context value */
+    HDmemcpy(&(*head)->ctx.vol_connector_prop, vol_connector_prop, sizeof(H5VL_connector_prop_t));
+
+    /* Mark the value as valid */
+    (*head)->ctx.vol_connector_prop_valid = TRUE;
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5CX_set_vol_connector_prop() */
+
+
+/*-------------------------------------------------------------------------
  * Function:    H5CX_get_dxpl
  *
  * Purpose:     Retrieves the DXPL ID for the current API call context.
@@ -1044,6 +1083,42 @@ done:
 
 
 /*-------------------------------------------------------------------------
+ * Function:    H5CX_get_vol_connector_prop
+ *
+ * Purpose:     Retrieves the VOL connector ID & info for an operation.
+ *
+ * Return:      Non-negative on success / Negative on failure
+ *
+ * Programmer:  Quincey Koziol
+ *              January 3, 2019
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5CX_get_vol_connector_prop(H5VL_connector_prop_t *vol_connector_prop)
+{
+    H5CX_node_t **head = H5CX_get_my_context();  /* Get the pointer to the head of the API context, for this thread */
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity check */
+    HDassert(vol_connector_prop);
+    HDassert(head && *head);
+
+    /* Check for value that was set */
+    if((*head)->ctx.vol_connector_prop_valid)
+        /* Get the value */
+        HDmemcpy(vol_connector_prop, &(*head)->ctx.vol_connector_prop, sizeof(H5VL_connector_prop_t));
+    else
+        HDmemset(vol_connector_prop, 0, sizeof(H5VL_connector_prop_t));
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5CX_get_vol_connector_prop() */
+
+
+/*-------------------------------------------------------------------------
  * Function:    H5CX_get_tag
  *
  * Purpose:     Retrieves the object tag for the current API call context.
@@ -1182,6 +1257,32 @@ H5CX_get_mpi_file_flushing(void)
 
     FUNC_LEAVE_NOAPI((*head)->ctx.mpi_file_flushing)
 } /* end H5CX_get_mpi_file_flushing() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5CX_get_mpio_rank0_bcast 
+ *
+ * Purpose:     Retrieves if the dataset meets read-with-rank0-and-bcast requirements for the current API call context.
+ *
+ * Return:      Non-negative on success / Negative on failure
+ *
+ * Programmer:  M. Breitenfeld
+ *              December 31, 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+hbool_t
+H5CX_get_mpio_rank0_bcast(void)
+{
+    H5CX_node_t **head = H5CX_get_my_context();  /* Get the pointer to the head of the API context, for this thread */
+
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    /* Sanity check */
+    HDassert(head && *head);
+
+    FUNC_LEAVE_NOAPI((*head)->ctx.rank0_bcast)
+} /* end H5CX_get_mpio_rank0_bcast() */
 #endif /* H5_HAVE_PARALLEL */
 
 
@@ -2113,6 +2214,34 @@ H5CX_set_mpi_file_flushing(hbool_t flushing)
 
     FUNC_LEAVE_NOAPI_VOID
 } /* end H5CX_set_mpi_file_flushing() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5CX_set_mpio_rank0_bcast
+ *
+ * Purpose:     Sets the "dataset meets read-with-rank0-and-bcast requirements" flag for the current API call context.
+ *
+ * Return:      <none>
+ *
+ * Programmer:  M. Breitenfeld
+ *              December 31, 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+void
+H5CX_set_mpio_rank0_bcast(hbool_t rank0_bcast)
+{
+    H5CX_node_t **head = H5CX_get_my_context();  /* Get the pointer to the head of the API context, for this thread */
+
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    /* Sanity checks */
+    HDassert(head && *head);
+
+    (*head)->ctx.rank0_bcast = rank0_bcast;
+
+    FUNC_LEAVE_NOAPI_VOID
+} /* end H5CX_set_mpio_rank0_bcast() */
 #endif /* H5_HAVE_PARALLEL */
 
 
@@ -2524,6 +2653,40 @@ H5CX_test_set_mpio_coll_chunk_multi_ratio_ind(int mpio_coll_chunk_multi_ratio_in
 done:
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5CX_test_set_mpio_coll_chunk_multi_ratio_ind() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5CX_test_set_mpio_coll_rank0_bcast
+ *
+ * Purpose:     Sets the instrumented "read-with-rank0-bcast" flag for the current API call context.
+ *
+ * Note:        Only sets value if property set in DXPL
+ *
+ * Return:      Non-negative on success / Negative on failure
+ *
+ * Programmer:  Quincey Koziol
+ *              January 2, 2019
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5CX_test_set_mpio_coll_rank0_bcast(hbool_t mpio_coll_rank0_bcast)
+{
+    H5CX_node_t **head = H5CX_get_my_context();  /* Get the pointer to the head of the API context, for this thread */
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_NOAPI_NOINIT
+
+    /* Sanity checks */
+    HDassert(head && *head);
+    HDassert(!((*head)->ctx.dxpl_id == H5P_DEFAULT || 
+            (*head)->ctx.dxpl_id == H5P_DATASET_XFER_DEFAULT));
+
+    H5CX_TEST_SET_PROP(H5D_XFER_COLL_RANK0_BCAST_NAME, mpio_coll_rank0_bcast)
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5CX_test_set_mpio_coll_rank0_bcast() */
 #endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
 #endif /* H5_HAVE_PARALLEL */
 
@@ -2568,6 +2731,7 @@ H5CX__pop_common(void)
     H5CX_SET_PROP(H5D_XFER_COLL_CHUNK_LINK_NUM_FALSE_NAME, mpio_coll_chunk_link_num_false)
     H5CX_SET_PROP(H5D_XFER_COLL_CHUNK_MULTI_RATIO_COLL_NAME, mpio_coll_chunk_multi_ratio_coll)
     H5CX_SET_PROP(H5D_XFER_COLL_CHUNK_MULTI_RATIO_IND_NAME, mpio_coll_chunk_multi_ratio_ind)
+    H5CX_SET_PROP(H5D_XFER_COLL_RANK0_BCAST_NAME, mpio_coll_rank0_bcast)
 #endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
 #endif /* H5_HAVE_PARALLEL */
 
diff --git a/src/H5CXprivate.h b/src/H5CXprivate.h
index 57ca5cd..46d25d0 100644
--- a/src/H5CXprivate.h
+++ b/src/H5CXprivate.h
@@ -64,17 +64,20 @@ H5_DLL herr_t H5CX_set_apl(hid_t *acspl_id, const H5P_libclass_t *libclass,
     hid_t loc_id, hbool_t is_collective);
 H5_DLL herr_t H5CX_set_loc(hid_t loc_id);
 H5_DLL herr_t H5CX_set_vol_wrap_ctx(void *wrap_ctx);
+H5_DLL herr_t H5CX_set_vol_connector_prop(const H5VL_connector_prop_t *vol_connector_prop);
 
 /* "Getter" routines for API context info */
 H5_DLL hid_t H5CX_get_dxpl(void);
 H5_DLL hid_t H5CX_get_lapl(void);
 H5_DLL herr_t H5CX_get_vol_wrap_ctx(void **wrap_ctx);
+H5_DLL herr_t H5CX_get_vol_connector_prop(H5VL_connector_prop_t *vol_connector_prop);
 H5_DLL haddr_t H5CX_get_tag(void);
 H5_DLL H5AC_ring_t H5CX_get_ring(void);
 #ifdef H5_HAVE_PARALLEL
 H5_DLL hbool_t H5CX_get_coll_metadata_read(void);
 H5_DLL herr_t H5CX_get_mpi_coll_datatypes(MPI_Datatype *btype, MPI_Datatype *ftype);
 H5_DLL hbool_t H5CX_get_mpi_file_flushing(void);
+H5_DLL hbool_t H5CX_get_mpio_rank0_bcast(void);
 #endif /* H5_HAVE_PARALLEL */
 
 /* "Getter" routines for DXPL properties cached in API context */
@@ -110,6 +113,7 @@ H5_DLL void H5CX_set_coll_metadata_read(hbool_t cmdr);
 H5_DLL herr_t H5CX_set_mpi_coll_datatypes(MPI_Datatype btype, MPI_Datatype ftype);
 H5_DLL herr_t H5CX_set_mpio_coll_opt(H5FD_mpio_collective_opt_t mpio_coll_opt);
 H5_DLL void H5CX_set_mpi_file_flushing(hbool_t flushing);
+H5_DLL void H5CX_set_mpio_rank0_bcast(hbool_t rank0_bcast);
 #endif /* H5_HAVE_PARALLEL */
 
 /* "Setter" routines for DXPL properties cached in API context */
@@ -135,6 +139,7 @@ H5_DLL herr_t H5CX_test_set_mpio_coll_chunk_link_num_true(int mpio_coll_chunk_li
 H5_DLL herr_t H5CX_test_set_mpio_coll_chunk_link_num_false(int mpio_coll_chunk_link_num_false);
 H5_DLL herr_t H5CX_test_set_mpio_coll_chunk_multi_ratio_coll(int mpio_coll_chunk_multi_ratio_coll);
 H5_DLL herr_t H5CX_test_set_mpio_coll_chunk_multi_ratio_ind(int mpio_coll_chunk_multi_ratio_ind);
+H5_DLL herr_t H5CX_test_set_mpio_coll_rank0_bcast(hbool_t rank0_bcast);
 #endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
 #endif /* H5_HAVE_PARALLEL */
 
diff --git a/src/H5Cdbg.c b/src/H5Cdbg.c
index 08c70d9..1f55e86 100644
--- a/src/H5Cdbg.c
+++ b/src/H5Cdbg.c
@@ -476,42 +476,6 @@ done:
 
 
 /*-------------------------------------------------------------------------
- * Function:    H5C_set_trace_file_ptr
- *
- * Purpose:     Set the trace_file_ptr field for the cache.
- *
- *              This field must either be NULL (which turns of trace
- *              file logging), or be a pointer to an open file to which
- *              trace file data is to be written.
- *
- * Return:      Non-negative on success/Negative on failure
- *
- * Programmer:  John Mainzer
- *              1/20/06
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5C_set_trace_file_ptr(H5C_t * cache_ptr, FILE * trace_file_ptr)
-{
-    herr_t		ret_value = SUCCEED;   /* Return value */
-
-    FUNC_ENTER_NOAPI(FAIL)
-
-    /* This would normally be an assert, but we need to use an HGOTO_ERROR
-     * call to shut up the compiler.
-     */
-    if((NULL == cache_ptr) || (cache_ptr->magic != H5C__H5C_T_MAGIC))
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr")
-
-    cache_ptr->trace_file_ptr = trace_file_ptr;
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* H5C_set_trace_file_ptr() */
-
-
-/*-------------------------------------------------------------------------
  * Function:    H5C_stats
  *
  * Purpose:     Prints statistics about the cache.
diff --git a/src/H5Clog.c b/src/H5Clog.c
index 3353619..0ae7f13 100644
--- a/src/H5Clog.c
+++ b/src/H5Clog.c
@@ -13,11 +13,9 @@
 
 /*-------------------------------------------------------------------------
  *
- * Created:             H5Clog.c
- *                      May 30 2016
- *                      Quincey Koziol
+ * Created:     H5Clog.c
  *
- * Purpose:             Functions for generic cache logging in JSON format
+ * Purpose:     Functions for metadata cache logging
  *
  *-------------------------------------------------------------------------
  */
@@ -30,14 +28,12 @@
 /***********/
 /* Headers */
 /***********/
-#include "H5private.h"          /* Generic Functions                    */
-#ifdef H5_HAVE_PARALLEL
-#define H5AC_FRIEND		/*suppress error about including H5ACpkg	  */
-#include "H5ACpkg.h"            /* Metadata cache                       */
-#endif /* H5_HAVE_PARALLEL */
-#include "H5Cpkg.h"            /* Metadata cache                       */
-#include "H5Eprivate.h"         /* Error handling                       */
-#include "H5MMprivate.h"	/* Memory management			*/
+#include "H5private.h"          /* Generic Functions                        */
+#define H5AC_FRIEND     /* Suppress error about including H5ACpkg */
+#include "H5ACpkg.h"            /* Metadata cache                           */
+#include "H5Cpkg.h"             /* Cache                                    */
+#include "H5Clog.h"             /* Cache logging                            */
+#include "H5Eprivate.h"         /* Error handling                           */
 
 
 /****************/
@@ -77,133 +73,109 @@
 
 
 /*-------------------------------------------------------------------------
- * Function:    H5C_set_up_logging
+ * Function:    H5C_log_set_up
  *
  * Purpose:     Setup for metadata cache logging.
  *
- *              Metadata logging is enabled and disabled at two levels. This
- *              function and the associated tear_down function open and close
- *              the log file. the start_ and stop_logging functions are then
- *              used to switch logging on/off. Optionally, logging can begin
- *              as soon as the log file is opened (set via the start_immediately
- *              parameter to this function).
- *
- *              The log functionality is split between the H5C and H5AC
- *              packages. Log state and direct log manipulation resides in
- *              H5C. Log messages are generated in H5AC and sent to
- *              the H5C_write_log_message function.
+ * Return:      SUCCEED/FAIL
  *
- * Return:      Non-negative on success/Negative on failure
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
+ * Programmer:  Dana Robinson
+ *              Fall 2018
  *
  *-------------------------------------------------------------------------
  */
 herr_t
-H5C_set_up_logging(H5C_t *cache_ptr, const char log_location[],
-    hbool_t start_immediately)
+H5C_log_set_up(H5C_t *cache, const char log_location[], H5C_log_style_t style, hbool_t start_immediately)
 {
-#ifdef H5_HAVE_PARALLEL
-    H5AC_aux_t *aux_ptr = NULL;
-#endif /*H5_HAVE_PARALLEL*/
-    char *file_name = NULL;
-    size_t n_chars;
-    herr_t ret_value = SUCCEED;      /* Return value */
+    int mpi_rank = -1;              /* -1 indicates serial (no MPI rank) */
+    herr_t ret_value = SUCCEED;     /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
 
     /* Sanity checks */
-    if(NULL == cache_ptr)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "cache_ptr == NULL")
-    if(H5C__H5C_T_MAGIC != cache_ptr->magic)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "cache magic value incorrect")
-    if(cache_ptr->logging_enabled)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "logging already set up")
-    if(NULL == log_location)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "NULL log location not allowed")
-
-    /* Possibly fix up the log file name.
-     * The extra 39 characters are for adding the rank to the file name
-     * under parallel HDF5. 39 characters allows > 2^127 processes which
-     * should be enough for anybody.
-     *
-     * allocation size = <path length> + dot + <rank # length> + \0
-     */
-    n_chars = HDstrlen(log_location) + 1 + 39 + 1;
-    if(NULL == (file_name = (char *)H5MM_calloc(n_chars * sizeof(char))))
-        HGOTO_ERROR(H5E_RESOURCE, H5E_CANTALLOC, FAIL, "can't allocate memory for mdc log file name manipulation")
+    HDassert(cache);
+    HDassert(log_location);
 
+    /* Check logging flags */
+    if(cache->log_info->enabled)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "logging already set up")
+
+    /* Get the rank when MPI is in use. Logging clients will usually
+     * use that to create per-process logs.
+     */
 #ifdef H5_HAVE_PARALLEL
-    /* Add the rank to the log file name when MPI is in use */
-    aux_ptr = (H5AC_aux_t *)(cache_ptr->aux_ptr);
-
-    if(NULL == aux_ptr)
-        HDsnprintf(file_name, n_chars, "%s", log_location);
-    else {
-        if(aux_ptr->magic != H5AC__H5AC_AUX_T_MAGIC)
-            HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "bad aux_ptr->magic")
-        HDsnprintf(file_name, n_chars, "%s.%d", log_location, aux_ptr->mpi_rank);
-    } /* end else */
-#else /* H5_HAVE_PARALLEL */
-    HDsnprintf(file_name, n_chars, "%s", log_location);
-#endif /* H5_HAVE_PARALLEL */
-
-    /* Open log file */
-    if(NULL == (cache_ptr->log_file_ptr = HDfopen(file_name, "w")))
-        HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, FAIL, "can't create mdc log file")
+    if(NULL != cache->aux_ptr)
+        mpi_rank = ((H5AC_aux_t *)(cache->aux_ptr))->mpi_rank;
+#endif /*H5_HAVE_PARALLEL*/
+
+    /* Set up logging */
+    if(H5C_LOG_STYLE_JSON == style) {
+        if(H5C_log_json_set_up(cache->log_info, log_location, mpi_rank) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to set up json logging")
+    }
+    else if(H5C_LOG_STYLE_TRACE == style) {
+        if(H5C_log_trace_set_up(cache->log_info, log_location, mpi_rank) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to set up trace logging")
+    }
+    else
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unknown logging style")
 
     /* Set logging flags */
-    cache_ptr->logging_enabled = TRUE;
-    cache_ptr->currently_logging = start_immediately;
+    cache->log_info->enabled = TRUE;
+
+    /* Start logging if requested */
+    if(start_immediately)
+        if(H5C_start_logging(cache) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to start logging")
 
  done:
-    if(file_name)
-        file_name = (char *)H5MM_xfree(file_name);
 
     FUNC_LEAVE_NOAPI(ret_value)
-} /* H5C_set_up_logging() */
+} /* H5C_log_set_up() */
 
 
 /*-------------------------------------------------------------------------
- * Function:    H5C_tear_down_logging
+ * Function:    H5C_log_tear_down
  *
  * Purpose:     Tear-down for metadata cache logging.
  *
- * Return:      Non-negative on success/Negative on failure
+ * Return:      SUCCEED/FAIL
  *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
+ * Programmer:  Dana Robinson
+ *              Fall 2018
  *
  *-------------------------------------------------------------------------
  */
 herr_t
-H5C_tear_down_logging(H5C_t *cache_ptr)
+H5C_log_tear_down(H5C_t *cache)
 {
     herr_t ret_value = SUCCEED;      /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
 
     /* Sanity checks */
-    if(NULL == cache_ptr)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "cache_ptr == NULL")
-    if(H5C__H5C_T_MAGIC != cache_ptr->magic)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "cache magic value incorrect")
-    if(FALSE == cache_ptr->logging_enabled)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "logging not enabled")
+    HDassert(cache);
 
-    /* Unset logging flags */
-    cache_ptr->logging_enabled = FALSE;
-    cache_ptr->currently_logging = FALSE;
+    /* Check logging flags */
+    if(FALSE == cache->log_info->enabled)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "logging not enabled")
 
-    /* Close log file */
-    if(EOF == HDfclose(cache_ptr->log_file_ptr))
-        HGOTO_ERROR(H5E_FILE, H5E_CANTCLOSEFILE, FAIL, "problem closing mdc log file")
-    cache_ptr->log_file_ptr = NULL;
+    /* Stop logging if that's going on */
+    if(cache->log_info->logging)
+        if(H5C_stop_logging(cache) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to stop logging")
+
+    /* Tear down logging */
+    if(cache->log_info->cls->tear_down_logging)
+        if(cache->log_info->cls->tear_down_logging(cache->log_info) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific tear down call failed")
+
+    /* Unset logging flags */
+    cache->log_info->enabled = FALSE;
 
  done:
     FUNC_LEAVE_NOAPI(ret_value)
-} /* H5C_tear_down_logging() */
+} /* H5C_log_tear_down() */
 
 
 /*-------------------------------------------------------------------------
@@ -211,37 +183,39 @@ H5C_tear_down_logging(H5C_t *cache_ptr)
  *
  * Purpose:     Start logging metadata cache operations.
  *
- *              TODO: Add a function that dumps the current state of the
- *                    metadata cache.
+ * Return:      SUCCEED/FAIL
  *
- * Return:      Non-negative on success/Negative on failure
- *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
+ * Programmer:  Dana Robinson
+ *              Fall 2018
  *
  *-------------------------------------------------------------------------
  */
 herr_t
-H5C_start_logging(H5C_t *cache_ptr)
+H5C_start_logging(H5C_t *cache)
 {
     herr_t ret_value = SUCCEED;      /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
 
     /* Sanity checks */
-    if(NULL == cache_ptr)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "cache_ptr == NULL")
-    if(H5C__H5C_T_MAGIC != cache_ptr->magic)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "cache magic value incorrect")
-    if(FALSE == cache_ptr->logging_enabled)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "logging not enabled")
-    if(cache_ptr->currently_logging)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "logging already in progress")
+    HDassert(cache);
+
+    /* Check logging flags */
+    if(FALSE == cache->log_info->enabled)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "logging not enabled")
+
+    /* Start logging */
+    if(cache->log_info->cls->start_logging)
+        if(cache->log_info->cls->start_logging(cache->log_info) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific start call failed")
 
     /* Set logging flags */
-    cache_ptr->currently_logging = TRUE;
+    cache->log_info->logging = TRUE;
 
-    /* TODO - Dump cache state */
+    /* Write a log message */
+    if(cache->log_info->cls->write_start_log_msg)
+        if(cache->log_info->cls->write_start_log_msg(cache->log_info->udata) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific write start call failed")
 
  done:
     FUNC_LEAVE_NOAPI(ret_value)
@@ -253,32 +227,41 @@ H5C_start_logging(H5C_t *cache_ptr)
  *
  * Purpose:     Stop logging metadata cache operations.
  *
- * Return:      Non-negative on success/Negative on failure
+ * Return:      SUCCEED/FAIL
  *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
+ * Programmer:  Dana Robinson
+ *              Fall 2018
  *
  *-------------------------------------------------------------------------
  */
 herr_t
-H5C_stop_logging(H5C_t *cache_ptr)
+H5C_stop_logging(H5C_t *cache)
 {
     herr_t ret_value = SUCCEED;      /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
 
     /* Sanity checks */
-    if(NULL == cache_ptr)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "cache_ptr == NULL")
-    if(H5C__H5C_T_MAGIC != cache_ptr->magic)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "cache magic value incorrect")
-    if(FALSE == cache_ptr->logging_enabled)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "logging not enabled")
-    if(FALSE == cache_ptr->currently_logging)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "logging not in progress")
+    HDassert(cache);
+
+    /* Check logging flags */
+    if(FALSE == cache->log_info->enabled)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "logging not enabled")
+    if(FALSE == cache->log_info->logging)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "logging not in progress")
+
+    /* Write a log message */
+    if(cache->log_info->cls->write_stop_log_msg)
+        if(cache->log_info->cls->write_stop_log_msg(cache->log_info->udata) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific write stop call failed")
+
+    /* Stop logging */
+    if(cache->log_info->cls->stop_logging)
+        if(cache->log_info->cls->stop_logging(cache->log_info) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific stop call failed")
 
     /* Set logging flags */
-    cache_ptr->currently_logging = FALSE;
+    cache->log_info->logging = FALSE;
 
  done:
     FUNC_LEAVE_NOAPI(ret_value)
@@ -289,80 +272,706 @@ H5C_stop_logging(H5C_t *cache_ptr)
  * Function:    H5C_get_logging_status
  *
  * Purpose:     Determines if the cache is actively logging (via the OUT
- *              parameter).
+ *              parameters).
  *
- * Return:      Non-negative on success/Negative on failure
+ * Return:      SUCCEED/FAIL
  *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
+ * Programmer:  Dana Robinson
+ *              Fall 2018
  *
  *-------------------------------------------------------------------------
  */
 herr_t
-H5C_get_logging_status(const H5C_t *cache_ptr, /*OUT*/ hbool_t *is_enabled,
+H5C_get_logging_status(const H5C_t *cache, /*OUT*/ hbool_t *is_enabled,
                        /*OUT*/ hbool_t *is_currently_logging)
 {
-    herr_t ret_value = SUCCEED;      /* Return value */
+    FUNC_ENTER_NOAPI_NOERR
+
+    /* Sanity checks */
+    HDassert(cache);
+    HDassert(is_enabled);
+    HDassert(is_currently_logging);
+
+    /* Get logging flags */
+    *is_enabled = cache->log_info->enabled;
+    *is_currently_logging = cache->log_info->logging;
+
+    FUNC_LEAVE_NOAPI(SUCCEED)
+} /* H5C_get_logging_status() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_create_cache_msg
+ *
+ * Purpose:     Write a log message for cache creation.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_create_cache_msg(H5C_t *cache, herr_t fxn_ret_value) 
+{
+    herr_t ret_value = SUCCEED;         /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
 
     /* Sanity checks */
-    if(NULL == cache_ptr)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "cache_ptr == NULL")
-    if(H5C__H5C_T_MAGIC != cache_ptr->magic)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "cache magic value incorrect")
-    if(NULL == is_enabled)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "cache magic value incorrect")
-    if(NULL == is_currently_logging)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "cache magic value incorrect")
-
-    *is_enabled = cache_ptr->logging_enabled;
-    *is_currently_logging = cache_ptr->currently_logging;
+    HDassert(cache);
+
+    /* Write a log message */
+    if(cache->log_info->cls->write_create_cache_log_msg)
+        if(cache->log_info->cls->write_create_cache_log_msg(cache->log_info->udata, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific write create cache call failed")
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
-} /* H5C_get_logging_status() */
+} /* H5C_log_write_create_cache_msg() */
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_destroy_cache_msg
+ *
+ * Purpose:     Write a log message for cache destruction.
+ *
+ * NOTE:        This can't print out the H5AC call return value, since we
+ *              won't know that until the cache is destroyed and at that
+ *              point we no longer have pointers to the logging information.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_destroy_cache_msg(H5C_t *cache) 
+{
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    if(cache->log_info->cls->write_destroy_cache_log_msg)
+        if(cache->log_info->cls->write_destroy_cache_log_msg(cache->log_info->udata) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific write destroy cache call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_destroy_cache_msg() */
 
 
 /*-------------------------------------------------------------------------
- * Function:    H5C_write_log_message
+ * Function:    H5C_log_write_evict_cache_msg
  *
- * Purpose:     Write a message to the log file and flush the file. 
- *              The message string is neither modified nor freed.
+ * Purpose:     Write a log message for eviction of cache entries.
  *
- * Return:      Non-negative on success/Negative on failure
+ * Return:      SUCCEED/FAIL
  *
- * Programmer:	Dana Robinson
- *              Sunday, March 16, 2014
+ * Programmer:  Dana Robinson
+ *              Fall 2018
  *
  *-------------------------------------------------------------------------
  */
 herr_t
-H5C_write_log_message(const H5C_t *cache_ptr, const char message[])
+H5C_log_write_evict_cache_msg(H5C_t *cache, herr_t fxn_ret_value)
 {
-    size_t n_chars;
-    herr_t ret_value = SUCCEED;      /* Return value */
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    if(cache->log_info->cls->write_evict_cache_log_msg)
+        if(cache->log_info->cls->write_evict_cache_log_msg(cache->log_info->udata, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific write evict cache call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_evict_cache_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_expunge_entry_msg
+ *
+ * Purpose:     Write a log message for expunge of cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_expunge_entry_msg(H5C_t *cache, haddr_t address,
+    int type_id, herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;
 
     FUNC_ENTER_NOAPI(FAIL)
 
     /* Sanity checks */
-    if(NULL == cache_ptr)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "cache_ptr == NULL")
-    if(H5C__H5C_T_MAGIC != cache_ptr->magic)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "cache magic value incorrect")
-    if(FALSE == cache_ptr->currently_logging)
-        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "not currently logging")
-    if(NULL == message)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "NULL log message not allowed")
-
-    /* Write the log message and flush */
-    n_chars = HDstrlen(message);
-    if((int)n_chars != HDfprintf(cache_ptr->log_file_ptr, message))
-        HGOTO_ERROR(H5E_FILE, H5E_WRITEERROR, FAIL, "error writing log message")
-    if(EOF == HDfflush(cache_ptr->log_file_ptr))
-        HGOTO_ERROR(H5E_FILE, H5E_WRITEERROR, FAIL, "error flushing log message")
+    HDassert(cache);
+
+    /* Write a log message */
+    if(cache->log_info->cls->write_expunge_entry_log_msg)
+        if(cache->log_info->cls->write_expunge_entry_log_msg(cache->log_info->udata, address, type_id, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific write expunge entry call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_expunge_entry_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_flush_cache_msg
+ *
+ * Purpose:     Write a log message for cache flushes.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_flush_cache_msg(H5C_t *cache, herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    if(cache->log_info->cls->write_flush_cache_log_msg)
+        if(cache->log_info->cls->write_flush_cache_log_msg(cache->log_info->udata, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific flush cache call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_flush_cache_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_insert_entry_msg
+ *
+ * Purpose:     Write a log message for insertion of cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_insert_entry_msg(H5C_t *cache, haddr_t address,
+    int type_id, unsigned flags, size_t size, herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    if(cache->log_info->cls->write_insert_entry_log_msg)
+        if(cache->log_info->cls->write_insert_entry_log_msg(cache->log_info->udata, address, type_id, flags, size, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific insert entry call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_insert_entry_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_mark_entry_dirty_msg
+ *
+ * Purpose:     Write a log message for marking cache entries as dirty.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_mark_entry_dirty_msg(H5C_t *cache, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    HDassert(entry);
+    if(cache->log_info->cls->write_mark_entry_dirty_log_msg)
+        if(cache->log_info->cls->write_mark_entry_dirty_log_msg(cache->log_info->udata, entry, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific mark dirty entry call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_mark_entry_dirty_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_mark_entry_clean_msg
+ *
+ * Purpose:     Write a log message for marking cache entries as clean.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_mark_entry_clean_msg(H5C_t *cache, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    HDassert(entry);
+    if(cache->log_info->cls->write_mark_entry_clean_log_msg)
+        if(cache->log_info->cls->write_mark_entry_clean_log_msg(cache->log_info->udata, entry, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific mark clean entry call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_mark_entry_clean_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_mark_unserialized_entry_msg
+ *
+ * Purpose:     Write a log message for marking cache entries as unserialized.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_mark_unserialized_entry_msg(H5C_t *cache,
+    const H5C_cache_entry_t *entry, herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    HDassert(entry);
+    if(cache->log_info->cls->write_mark_unserialized_entry_log_msg)
+        if(cache->log_info->cls->write_mark_unserialized_entry_log_msg(cache->log_info->udata, entry, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific mark unserialized entry call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_mark_unserialized_entry_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_mark_serialized_entry_msg
+ *
+ * Purpose:     Write a log message for marking cache entries as serialize.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_mark_serialized_entry_msg(H5C_t *cache, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    HDassert(entry);
+    if(cache->log_info->cls->write_mark_serialized_entry_log_msg)
+        if(cache->log_info->cls->write_mark_serialized_entry_log_msg(cache->log_info->udata, entry, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific mark serialized entry call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_mark_serialized_entry_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_move_entry_msg
+ *
+ * Purpose:     Write a log message for moving a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_move_entry_msg(H5C_t *cache, haddr_t old_addr, haddr_t new_addr,
+    int type_id, herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    if(cache->log_info->cls->write_move_entry_log_msg)
+        if(cache->log_info->cls->write_move_entry_log_msg(cache->log_info->udata, old_addr, new_addr, type_id, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific move entry call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_move_entry_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_pin_entry_msg
+ *
+ * Purpose:     Write a log message for pinning a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_pin_entry_msg(H5C_t *cache, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    HDassert(entry);
+    if(cache->log_info->cls->write_pin_entry_log_msg)
+        if(cache->log_info->cls->write_pin_entry_log_msg(cache->log_info->udata, entry, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific pin entry call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_pin_entry_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_create_fd_msg
+ *
+ * Purpose:     Write a log message for creating a flush dependency between
+ *              two cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_create_fd_msg(H5C_t *cache, const H5C_cache_entry_t *parent,
+    const H5C_cache_entry_t *child, herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    HDassert(parent);
+    HDassert(child);
+    if(cache->log_info->cls->write_create_fd_log_msg)
+        if(cache->log_info->cls->write_create_fd_log_msg(cache->log_info->udata, parent, child, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific create fd call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_create_fd_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_protect_entry_msg
+ *
+ * Purpose:     Write a log message for protecting a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_protect_entry_msg(H5C_t *cache, const H5C_cache_entry_t *entry,
+    int type_id, unsigned flags, herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    HDassert(entry);
+    if(cache->log_info->cls->write_protect_entry_log_msg)
+        if(cache->log_info->cls->write_protect_entry_log_msg(cache->log_info->udata, entry, type_id, flags, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific protect entry call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_protect_entry_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_resize_entry_msg
+ *
+ * Purpose:     Write a log message for resizing a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_resize_entry_msg(H5C_t *cache, const H5C_cache_entry_t *entry,
+    size_t new_size, herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    HDassert(entry);
+    if(cache->log_info->cls->write_resize_entry_log_msg)
+        if(cache->log_info->cls->write_resize_entry_log_msg(cache->log_info->udata, entry, new_size, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific resize entry call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_resize_entry_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_unpin_entry_msg
+ *
+ * Purpose:     Write a log message for unpinning a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_unpin_entry_msg(H5C_t *cache, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    HDassert(entry);
+    if(cache->log_info->cls->write_unpin_entry_log_msg)
+        if(cache->log_info->cls->write_unpin_entry_log_msg(cache->log_info->udata, entry, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific unpin entry call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_unpin_entry_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_destroy_fd_msg
+ *
+ * Purpose:     Write a log message for destroying a flush dependency
+ *              between two cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_destroy_fd_msg(H5C_t *cache, const H5C_cache_entry_t *parent,
+    const H5C_cache_entry_t *child, herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    HDassert(parent);
+    HDassert(child);
+    if(cache->log_info->cls->write_destroy_fd_log_msg)
+        if(cache->log_info->cls->write_destroy_fd_log_msg(cache->log_info->udata, parent, child, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific destroy fd call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_destroy_fd_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_unprotect_entry_msg
+ *
+ * Purpose:     Write a log message for unprotecting a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_unprotect_entry_msg(H5C_t *cache, const H5C_cache_entry_t *entry,
+    int type_id, unsigned flags, herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    HDassert(entry);
+    if(cache->log_info->cls->write_unprotect_entry_log_msg)
+        if(cache->log_info->cls->write_unprotect_entry_log_msg(cache->log_info->udata, entry, type_id, flags, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific unprotect entry call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_unprotect_entry_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_set_cache_config_msg
+ *
+ * Purpose:     Write a log message for setting the cache configuration.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_set_cache_config_msg(H5C_t *cache, const H5AC_cache_config_t *config,
+    herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    HDassert(config);
+    if(cache->log_info->cls->write_set_cache_config_log_msg)
+        if(cache->log_info->cls->write_set_cache_config_log_msg(cache->log_info->udata, config, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific set cache config call failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_write_set_cache_config_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_write_remove_entry_msg
+ *
+ * Purpose:     Write a log message for removing a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_write_remove_entry_msg(H5C_t *cache, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(cache);
+
+    /* Write a log message */
+    HDassert(entry);
+    if(cache->log_info->cls->write_remove_entry_log_msg)
+        if(cache->log_info->cls->write_remove_entry_log_msg(cache->log_info->udata, entry, fxn_ret_value) < 0)
+            HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "log-specific remove entry call failed")
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
-} /* H5C_write_log_message() */
+} /* H5C_log_write_remove_entry_msg() */
 
diff --git a/src/H5Clog.h b/src/H5Clog.h
new file mode 100644
index 0000000..9ba6786
--- /dev/null
+++ b/src/H5Clog.h
@@ -0,0 +1,114 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Purpose:     Cache logging header file
+ */
+
+#ifndef _H5Clog_H
+#define _H5Clog_H
+
+/* Get package's private header */
+#include "H5Cprivate.h"         /* Cache                                    */
+
+/**************************/
+/* Package Private Macros */
+/**************************/
+
+/****************************/
+/* Package Private Typedefs */
+/****************************/
+
+/* Forward declaration for class struct */
+typedef struct H5C_log_info_t H5C_log_info_t;
+
+/* Class for generating logging messages */
+typedef struct H5C_log_class_t {
+    const char	*name;				/* String for debugging */
+
+    /* Callbacks for writing log messages */
+    herr_t (*tear_down_logging)(H5C_log_info_t *log_info);
+    herr_t (*start_logging)(H5C_log_info_t *log_info);
+    herr_t (*stop_logging)(H5C_log_info_t *log_info);
+    herr_t (*write_start_log_msg)(void *udata);
+    herr_t (*write_stop_log_msg)(void *udata);
+    herr_t (*write_create_cache_log_msg)(void *udata, herr_t fxn_ret_value);
+    herr_t (*write_destroy_cache_log_msg)(void *udata);
+    herr_t (*write_evict_cache_log_msg)(void *udata, herr_t fxn_ret_value);
+    herr_t (*write_expunge_entry_log_msg)(void *udata, haddr_t address, int type_id, herr_t fxn_ret_value);
+    herr_t (*write_flush_cache_log_msg)(void *udata, herr_t fxn_ret_value);
+    herr_t (*write_insert_entry_log_msg)(void *udata, haddr_t address, int type_id, unsigned flags, size_t size, herr_t fxn_ret_value);
+    herr_t (*write_mark_entry_dirty_log_msg)(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+    herr_t (*write_mark_entry_clean_log_msg)(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+    herr_t (*write_mark_unserialized_entry_log_msg)(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+    herr_t (*write_mark_serialized_entry_log_msg)(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+    herr_t (*write_move_entry_log_msg)(void *udata, haddr_t old_addr, haddr_t new_addr, int type_id, herr_t fxn_ret_value);
+    herr_t (*write_pin_entry_log_msg)(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+    herr_t (*write_create_fd_log_msg)(void *udata, const H5C_cache_entry_t *parent, const H5C_cache_entry_t *child, herr_t fxn_ret_value);
+    herr_t (*write_protect_entry_log_msg)(void *udata, const H5C_cache_entry_t *entry, int type_id, unsigned flags, herr_t fxn_ret_value);
+    herr_t (*write_resize_entry_log_msg)(void *udata, const H5C_cache_entry_t *entry, size_t new_size, herr_t fxn_ret_value);
+    herr_t (*write_unpin_entry_log_msg)(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+    herr_t (*write_destroy_fd_log_msg)(void *udata, const H5C_cache_entry_t *parent, const H5C_cache_entry_t *child, herr_t fxn_ret_value);
+    herr_t (*write_unprotect_entry_log_msg)(void *udata, const H5C_cache_entry_t *entry, int type_id, unsigned flags, herr_t fxn_ret_value);
+    herr_t (*write_set_cache_config_log_msg)(void *udata, const H5AC_cache_config_t *config, herr_t fxn_ret_value);
+    herr_t (*write_remove_entry_log_msg)(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+
+} H5C_log_class_t;
+
+/* Logging information */
+struct H5C_log_info_t {
+    hbool_t             enabled;                /* Was the logging set up? */
+    hbool_t             logging;                /* Are we currently logging? */
+    H5C_log_class_t    *cls;                    /* Callbacks for writing log messages */
+    void               *udata;                  /* Log-specific data */
+};
+
+
+/*****************************/
+/* Package Private Variables */
+/*****************************/
+
+
+/******************************/
+/* Package Private Prototypes */
+/******************************/
+H5_DLL herr_t H5C_log_set_up(H5C_t *cache, const char log_location[], H5C_log_style_t style, hbool_t start_immediately);
+H5_DLL herr_t H5C_log_tear_down(H5C_t *cache);
+
+H5_DLL herr_t H5C_log_write_create_cache_msg(H5C_t *cache, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_destroy_cache_msg(H5C_t *cache);
+H5_DLL herr_t H5C_log_write_evict_cache_msg(H5C_t *cache, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_expunge_entry_msg(H5C_t *cache, haddr_t address, int type_id, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_flush_cache_msg(H5C_t *cache, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_insert_entry_msg(H5C_t *cache, haddr_t address, int type_id, unsigned flags, size_t size, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_mark_entry_dirty_msg(H5C_t *cache, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_mark_entry_clean_msg(H5C_t *cache, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_mark_unserialized_entry_msg(H5C_t *cache, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_mark_serialized_entry_msg(H5C_t *cache, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_move_entry_msg(H5C_t *cache, haddr_t old_addr, haddr_t new_addr, int type_id, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_pin_entry_msg(H5C_t *cache, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_create_fd_msg(H5C_t *cache, const H5C_cache_entry_t *parent, const H5C_cache_entry_t *child, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_protect_entry_msg(H5C_t *cache, const H5C_cache_entry_t *entry, int type_id, unsigned flags, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_resize_entry_msg(H5C_t *cache, const H5C_cache_entry_t *entry, size_t new_size, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_unpin_entry_msg(H5C_t *cache, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_destroy_fd_msg(H5C_t *cache, const H5C_cache_entry_t *parent, const H5C_cache_entry_t *child, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_unprotect_entry_msg(H5C_t *cache, const H5C_cache_entry_t *entry, int type_id, unsigned flags, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_set_cache_config_msg(H5C_t *cache, const H5AC_cache_config_t *config, herr_t fxn_ret_value);
+H5_DLL herr_t H5C_log_write_remove_entry_msg(H5C_t *cache, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+
+/* Logging-specific setup functions */
+H5_DLL herr_t H5C_log_json_set_up(H5C_log_info_t *log_info, const char log_location[], int mpi_rank);
+H5_DLL herr_t H5C_log_trace_set_up(H5C_log_info_t *log_info, const char log_location[], int mpi_rank);
+
+#endif /* _H5Clog_H */
+
diff --git a/src/H5Clog_json.c b/src/H5Clog_json.c
new file mode 100644
index 0000000..ccfa222
--- /dev/null
+++ b/src/H5Clog_json.c
@@ -0,0 +1,1365 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*-------------------------------------------------------------------------
+ *
+ * Created:     H5Clog_json.c
+ *
+ * Purpose:     Cache log implementation that emits JSON-formatted log
+ *              entries for consumption by new-fangled data analysis tools.
+ *
+ *-------------------------------------------------------------------------
+ */
+
+/****************/
+/* Module Setup */
+/****************/
+#include "H5Cmodule.h"         /* This source code file is part of the H5C module */
+
+/***********/
+/* Headers */
+/***********/
+#include "H5private.h"          /* Generic Functions                        */
+#include "H5Cpkg.h"             /* Cache                                    */
+#include "H5Clog.h"             /* Cache logging                            */
+#include "H5Eprivate.h"         /* Error handling                           */
+#include "H5MMprivate.h"        /* Memory management                        */
+
+
+/****************/
+/* Local Macros */
+/****************/
+
+/* Max log message size */
+#define H5C_MAX_JSON_LOG_MSG_SIZE 128
+
+
+/******************/
+/* Local Typedefs */
+/******************/
+
+
+/********************/
+/* Package Typedefs */
+/********************/
+
+typedef struct H5C_log_json_udata_t {
+    FILE *outfile;
+    char *message;
+} H5C_log_json_udata_t;
+
+
+/********************/
+/* Local Prototypes */
+/********************/
+
+/* Internal message handling calls */
+static herr_t H5C__json_write_log_message(H5C_log_json_udata_t *json_udata);
+
+/* Log message callbacks */
+static herr_t H5C__json_tear_down_logging(H5C_log_info_t *log_info);
+static herr_t H5C__json_write_start_log_msg(void *udata);
+static herr_t H5C__json_write_stop_log_msg(void *udata);
+static herr_t H5C__json_write_create_cache_log_msg(void *udata, herr_t fxn_ret_value);
+static herr_t H5C__json_write_destroy_cache_log_msg(void *udata);
+static herr_t H5C__json_write_evict_cache_log_msg(void *udata, herr_t fxn_ret_value);
+static herr_t H5C__json_write_expunge_entry_log_msg(void *udata, haddr_t address, int type_id, herr_t fxn_ret_value);
+static herr_t H5C__json_write_flush_cache_log_msg(void *udata, herr_t fxn_ret_value);
+static herr_t H5C__json_write_insert_entry_log_msg(void *udata, haddr_t address, int type_id, unsigned flags, size_t size, herr_t fxn_ret_value);
+static herr_t H5C__json_write_mark_entry_dirty_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__json_write_mark_entry_clean_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__json_write_mark_unserialized_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__json_write_mark_serialized_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__json_write_move_entry_log_msg(void *udata, haddr_t old_addr, haddr_t new_addr, int type_id, herr_t fxn_ret_value);
+static herr_t H5C__json_write_pin_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__json_write_create_fd_log_msg(void *udata, const H5C_cache_entry_t *parent, const H5C_cache_entry_t *child, herr_t fxn_ret_value);
+static herr_t H5C__json_write_protect_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, int type_id, unsigned flags, herr_t fxn_ret_value);
+static herr_t H5C__json_write_resize_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, size_t new_size, herr_t fxn_ret_value);
+static herr_t H5C__json_write_unpin_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__json_write_destroy_fd_log_msg(void *udata, const H5C_cache_entry_t *parent, const H5C_cache_entry_t *child, herr_t fxn_ret_value);
+static herr_t H5C__json_write_unprotect_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, int type_id, unsigned flags, herr_t fxn_ret_value);
+static herr_t H5C__json_write_set_cache_config_log_msg(void *udata, const H5AC_cache_config_t *config, herr_t fxn_ret_value);
+static herr_t H5C__json_write_remove_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+
+
+/*********************/
+/* Package Variables */
+/*********************/
+
+
+/*****************************/
+/* Library Private Variables */
+/*****************************/
+
+
+/*******************/
+/* Local Variables */
+/*******************/
+
+/* Note that there's no cache set up call since that's the
+ * place where this struct is wired into the cache.
+ */
+static H5C_log_class_t H5C_json_log_class_g = {
+    "json",
+    H5C__json_tear_down_logging,
+    NULL,                               /* start logging */
+    NULL,                               /* stop logging */
+    H5C__json_write_start_log_msg,
+    H5C__json_write_stop_log_msg,
+    H5C__json_write_create_cache_log_msg,
+    H5C__json_write_destroy_cache_log_msg,
+    H5C__json_write_evict_cache_log_msg,
+    H5C__json_write_expunge_entry_log_msg,
+    H5C__json_write_flush_cache_log_msg,
+    H5C__json_write_insert_entry_log_msg,
+    H5C__json_write_mark_entry_dirty_log_msg,
+    H5C__json_write_mark_entry_clean_log_msg,
+    H5C__json_write_mark_unserialized_entry_log_msg,
+    H5C__json_write_mark_serialized_entry_log_msg,
+    H5C__json_write_move_entry_log_msg,
+    H5C__json_write_pin_entry_log_msg,
+    H5C__json_write_create_fd_log_msg,
+    H5C__json_write_protect_entry_log_msg,
+    H5C__json_write_resize_entry_log_msg,
+    H5C__json_write_unpin_entry_log_msg,
+    H5C__json_write_destroy_fd_log_msg,
+    H5C__json_write_unprotect_entry_log_msg,
+    H5C__json_write_set_cache_config_log_msg,
+    H5C__json_write_remove_entry_log_msg
+};
+
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_log_message
+ *
+ * Purpose:     Write a message to the log file and flush the file. 
+ *              The message string is neither modified nor freed.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_log_message(H5C_log_json_udata_t *json_udata)
+{
+    size_t n_chars;
+    herr_t ret_value = SUCCEED;      /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->outfile);
+    HDassert(json_udata->message);
+
+    /* Write the log message and flush */
+    n_chars = HDstrlen(json_udata->message);
+    if((int)n_chars != HDfprintf(json_udata->outfile, json_udata->message))
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "error writing log message")
+    HDmemset((void *)(json_udata->message), 0, (size_t)(n_chars * sizeof(char)));
+            
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_log_message() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_json_set_up
+ *
+ * Purpose:     Setup for metadata cache logging.
+ *
+ *              Metadata logging is enabled and disabled at two levels. This
+ *              function and the associated tear_down function open and close
+ *              the log file. the start_ and stop_logging functions are then
+ *              used to switch logging on/off. Optionally, logging can begin
+ *              as soon as the log file is opened (set via the start_immediately
+ *              parameter to this function).
+ *
+ *              The log functionality is split between the H5C and H5AC
+ *              packages. Log state and direct log manipulation resides in
+ *              H5C. Log messages are generated in H5AC and sent to
+ *              the H5C__json_write_log_message function.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_json_set_up(H5C_log_info_t *log_info, const char log_location[], int mpi_rank)
+{
+    H5C_log_json_udata_t *json_udata = NULL;
+    char *file_name = NULL;
+    size_t n_chars;
+    herr_t ret_value = SUCCEED;      /* Return value */
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(log_info);
+    HDassert(log_location);
+
+    /* Set up the class struct */
+    log_info->cls = &H5C_json_log_class_g;
+
+    /* Allocate memory for the JSON-specific data */
+    if(NULL == (log_info->udata = H5MM_calloc(sizeof(H5C_log_json_udata_t))))
+        HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "memory allocation failed")
+    json_udata = (H5C_log_json_udata_t *)(log_info->udata);
+    
+    /* Allocate memory for the message buffer */
+    if(NULL == (json_udata->message = (char *)H5MM_calloc(H5C_MAX_JSON_LOG_MSG_SIZE * sizeof(char))))
+        HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "memory allocation failed")
+
+    /* Possibly fix up the log file name.
+     * The extra 39 characters are for adding the rank to the file name
+     * under parallel HDF5. 39 characters allows > 2^127 processes which
+     * should be enough for anybody.
+     *
+     * allocation size = "RANK_" + <rank # length> + dot + <path length> + \0
+     */
+    n_chars = 5 + 39 + 1 + HDstrlen(log_location) + 1;
+    if(NULL == (file_name = (char *)H5MM_calloc(n_chars * sizeof(char))))
+        HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "can't allocate memory for mdc log file name manipulation")
+
+    /* Add the rank to the log file name when MPI is in use */
+    if(-1 == mpi_rank)
+        HDsnprintf(file_name, n_chars, "%s", log_location);
+    else
+        HDsnprintf(file_name, n_chars, "RANK_%d.%s", mpi_rank, log_location);
+
+    /* Open log file and set it to be unbuffered */
+    if(NULL == (json_udata->outfile = HDfopen(file_name, "w")))
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "can't create mdc log file")
+    HDsetbuf(json_udata->outfile, NULL);
+
+ done:
+    if(file_name)
+        H5MM_xfree(file_name);
+
+    /* Free and reset the log info struct on errors */
+    if(FAIL == ret_value) {
+        /* Free */
+        if(json_udata && json_udata->message)
+            H5MM_xfree(json_udata->message);
+        if(json_udata)
+            H5MM_xfree(json_udata);
+
+        /* Reset */
+        log_info->udata = NULL;
+        log_info->cls = NULL;
+    }
+
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_json_set_up() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_tear_down_logging
+ *
+ * Purpose:     Tear-down for metadata cache logging.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_tear_down_logging(H5C_log_info_t *log_info)
+{
+    H5C_log_json_udata_t *json_udata = NULL;
+    herr_t ret_value = SUCCEED;      /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(log_info);
+
+    /* Alias */
+    json_udata = (H5C_log_json_udata_t *)(log_info->udata);
+
+    /* Free the message buffer */
+    H5MM_xfree(json_udata->message);
+
+    /* Close log file */
+    if(EOF == HDfclose(json_udata->outfile))
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "problem closing mdc log file")
+    json_udata->outfile = NULL;
+
+    /* Fre the udata */
+    H5MM_xfree(json_udata);
+
+    /* Reset the log class info and udata */
+    log_info->cls = NULL;
+    log_info->udata = NULL;
+
+ done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_tear_down_logging() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_start_log_msg
+ *
+ * Purpose:     Write a log message when logging starts.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_start_log_msg(void *udata)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string (opens the JSON array) */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\n\
+\"HDF5 metadata cache log messages\" : [\n\
+{\
+\"timestamp\":%lld,\
+\"action\":\"logging start\"\
+},\n\
+"
+    , (long long)HDtime(NULL));
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_start_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_stop_log_msg
+ *
+ * Purpose:     Write a log message when logging ends.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_stop_log_msg(void *udata)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string (closes the JSON array) */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"logging stop\"\
+}\n\
+]}\n\
+"
+    , (long long)HDtime(NULL));
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+ 
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_stop_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_create_cache_log_msg
+ *
+ * Purpose:     Write a log message for cache creation.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_create_cache_log_msg(void *udata, herr_t fxn_ret_value) 
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"create\",\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_create_cache_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_destroy_cache_log_msg
+ *
+ * Purpose:     Write a log message for cache destruction.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_destroy_cache_log_msg(void *udata)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"destroy\"\
+},\n\
+"
+    , (long long)HDtime(NULL));
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_destroy_cache_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_evict_cache_log_msg
+ *
+ * Purpose:     Write a log message for eviction of cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_evict_cache_log_msg(void *udata, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"evict\",\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_evict_cache_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_expunge_entry_log_msg
+ *
+ * Purpose:     Write a log message for expunge of cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_expunge_entry_log_msg(void *udata, haddr_t address,
+    int type_id, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"expunge\",\
+\"address\":0x%lx,\
+\"type_id\":%d,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)address, (int)type_id, (int)fxn_ret_value);
+
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_expunge_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_flush_cache_log_msg
+ *
+ * Purpose:     Write a log message for cache flushes.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_flush_cache_log_msg(void *udata, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"flush\",\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_flush_cache_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_insert_entry_log_msg
+ *
+ * Purpose:     Write a log message for insertion of cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_insert_entry_log_msg(void *udata, haddr_t address,
+    int type_id, unsigned flags, size_t size, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"insert\",\
+\"address\":0x%lx,\
+\"type_id\":%d,\
+\"flags\":0x%x,\
+\"size\":%d,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)address, type_id, flags,
+      (int)size, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_insert_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_mark_entry_dirty_log_msg
+ *
+ * Purpose:     Write a log message for marking cache entries as dirty.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_mark_entry_dirty_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"dirty\",\
+\"address\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_mark_entry_dirty_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_mark_entry_clean_log_msg
+ *
+ * Purpose:     Write a log message for marking cache entries as clean.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_mark_entry_clean_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"clean\",\
+\"address\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_mark_entry_clean_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_mark_unserialized_entry_log_msg
+ *
+ * Purpose:     Write a log message for marking cache entries as unserialized.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_mark_unserialized_entry_log_msg(void *udata,
+    const H5C_cache_entry_t *entry, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"unserialized\",\
+\"address\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_mark_unserialized_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_mark_serialize_entry_log_msg
+ *
+ * Purpose:     Write a log message for marking cache entries as serialize.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_mark_serialized_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"serialized\",\
+\"address\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_mark_serialized_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_move_entry_log_msg
+ *
+ * Purpose:     Write a log message for moving a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_move_entry_log_msg(void *udata, haddr_t old_addr, haddr_t new_addr,
+    int type_id, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"move\",\
+\"old_address\":0x%lx,\
+\"new_address\":0x%lx,\
+\"type_id\":%d,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)old_addr, 
+      (unsigned long)new_addr, type_id, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_move_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_pin_entry_log_msg
+ *
+ * Purpose:     Write a log message for pinning a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_pin_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"pin\",\
+\"address\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
+      (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_pin_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_create_fd_log_msg
+ *
+ * Purpose:     Write a log message for creating a flush dependency between
+ *              two cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_create_fd_log_msg(void *udata, const H5C_cache_entry_t *parent,
+    const H5C_cache_entry_t *child, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(parent);
+    HDassert(child);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"create_fd\",\
+\"parent_addr\":0x%lx,\
+\"child_addr\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)parent->addr, 
+      (unsigned long)child->addr, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_create_fd_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_protect_entry_log_msg
+ *
+ * Purpose:     Write a log message for protecting a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_protect_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    int type_id, unsigned flags, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    char rw_s[16];
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    if(H5C__READ_ONLY_FLAG == flags)
+        HDstrcpy(rw_s, "READ");
+    else 
+        HDstrcpy(rw_s, "WRITE");
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"protect\",\
+\"address\":0x%lx,\
+\"type_id\":%d,\
+\"readwrite\":\"%s\",\
+\"size\":%d,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
+      type_id, rw_s, (int)entry->size, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_protect_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_resize_entry_log_msg
+ *
+ * Purpose:     Write a log message for resizing a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_resize_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    size_t new_size, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"resize\",\
+\"address\":0x%lx,\
+\"new_size\":%d,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
+      (int)new_size, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_resize_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_unpin_entry_log_msg
+ *
+ * Purpose:     Write a log message for unpinning a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_unpin_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"unpin\",\
+\"address\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
+      (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_unpin_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_destroy_fd_log_msg
+ *
+ * Purpose:     Write a log message for destroying a flush dependency
+ *              between two cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_destroy_fd_log_msg(void *udata, const H5C_cache_entry_t *parent,
+    const H5C_cache_entry_t *child, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(parent);
+    HDassert(child);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"destroy_fd\",\
+\"parent_addr\":0x%lx,\
+\"child_addr\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)parent->addr, 
+      (unsigned long)child->addr, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_destroy_fd_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_unprotect_entry_log_msg
+ *
+ * Purpose:     Write a log message for unprotecting a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_unprotect_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    int type_id, unsigned flags, herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"unprotect\",\
+\"address\":0x%lx,\
+\"id\":%d,\
+\"flags\":%x,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
+      type_id, flags, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_unprotect_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_set_cache_config_log_msg
+ *
+ * Purpose:     Write a log message for setting the cache configuration.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_set_cache_config_log_msg(void *udata, const H5AC_cache_config_t *config,
+    herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(config);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"set_config\",\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (int)fxn_ret_value);
+
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_set_cache_config_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__json_write_remove_entry_log_msg
+ *
+ * Purpose:     Write a log message for removing a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__json_write_remove_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_json_udata_t *json_udata = (H5C_log_json_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(json_udata);
+    HDassert(json_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(json_udata->message, H5C_MAX_JSON_LOG_MSG_SIZE, 
+"\
+{\
+\"timestamp\":%lld,\
+\"action\":\"remove\",\
+\"address\":0x%lx,\
+\"returned\":%d\
+},\n\
+"
+    , (long long)HDtime(NULL), (unsigned long)entry->addr, 
+      (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__json_write_log_message(json_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__json_write_remove_entry_log_msg() */
+
diff --git a/src/H5Clog_trace.c b/src/H5Clog_trace.c
new file mode 100644
index 0000000..f7d6889
--- /dev/null
+++ b/src/H5Clog_trace.c
@@ -0,0 +1,1008 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*-------------------------------------------------------------------------
+ *
+ * Created:     H5Clog_trace.c
+ *
+ * Purpose:     Cache log implementation that emits trace entries intended
+ *              for consumption by a future 'cache replay' feature.
+ *
+ *-------------------------------------------------------------------------
+ */
+
+/****************/
+/* Module Setup */
+/****************/
+#include "H5Cmodule.h"         /* This source code file is part of the H5C module */
+
+/***********/
+/* Headers */
+/***********/
+#include "H5private.h"          /* Generic Functions                        */
+#include "H5Cpkg.h"             /* Cache                                    */
+#include "H5Clog.h"             /* Cache logging                            */
+#include "H5Eprivate.h"         /* Error handling                           */
+#include "H5MMprivate.h"        /* Memory management                        */
+
+
+/****************/
+/* Local Macros */
+/****************/
+
+/* Max log message size */
+#define H5C_MAX_TRACE_LOG_MSG_SIZE 2048
+
+
+/******************/
+/* Local Typedefs */
+/******************/
+
+
+/********************/
+/* Package Typedefs */
+/********************/
+
+typedef struct H5C_log_trace_udata_t {
+    FILE *outfile;
+    char *message;
+} H5C_log_trace_udata_t;
+
+
+/********************/
+/* Local Prototypes */
+/********************/
+
+/* Internal message handling calls */
+static herr_t H5C__trace_write_log_message(H5C_log_trace_udata_t *trace_udata);
+
+/* Log message callbacks */
+static herr_t H5C__trace_tear_down_logging(H5C_log_info_t *log_info);
+static herr_t H5C__trace_write_expunge_entry_log_msg(void *udata, haddr_t address, int type_id, herr_t fxn_ret_value);
+static herr_t H5C__trace_write_flush_cache_log_msg(void *udata, herr_t fxn_ret_value);
+static herr_t H5C__trace_write_insert_entry_log_msg(void *udata, haddr_t address, int type_id, unsigned flags, size_t size, herr_t fxn_ret_value);
+static herr_t H5C__trace_write_mark_entry_dirty_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__trace_write_mark_entry_clean_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__trace_write_mark_unserialized_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__trace_write_mark_serialized_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__trace_write_move_entry_log_msg(void *udata, haddr_t old_addr, haddr_t new_addr, int type_id, herr_t fxn_ret_value);
+static herr_t H5C__trace_write_pin_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__trace_write_create_fd_log_msg(void *udata, const H5C_cache_entry_t *parent, const H5C_cache_entry_t *child, herr_t fxn_ret_value);
+static herr_t H5C__trace_write_protect_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, int type_id, unsigned flags, herr_t fxn_ret_value);
+static herr_t H5C__trace_write_resize_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, size_t new_size, herr_t fxn_ret_value);
+static herr_t H5C__trace_write_unpin_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+static herr_t H5C__trace_write_destroy_fd_log_msg(void *udata, const H5C_cache_entry_t *parent, const H5C_cache_entry_t *child, herr_t fxn_ret_value);
+static herr_t H5C__trace_write_unprotect_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, int type_id, unsigned flags, herr_t fxn_ret_value);
+static herr_t H5C__trace_write_set_cache_config_log_msg(void *udata, const H5AC_cache_config_t *config, herr_t fxn_ret_value);
+static herr_t H5C__trace_write_remove_entry_log_msg(void *udata, const H5C_cache_entry_t *entry, herr_t fxn_ret_value);
+
+
+/*********************/
+/* Package Variables */
+/*********************/
+
+
+/*****************************/
+/* Library Private Variables */
+/*****************************/
+
+
+/*******************/
+/* Local Variables */
+/*******************/
+
+/* Note that there's no cache set up call since that's the
+ * place where this struct is wired into the cache.
+ */
+static H5C_log_class_t H5C_trace_log_class_g = {
+    "trace",
+    H5C__trace_tear_down_logging,
+    NULL,                               /* start logging */
+    NULL,                               /* stop logging */
+    NULL,                               /* write start message */
+    NULL,                               /* write stop message */
+    NULL,                               /* write create cache message */
+    NULL,                               /* write destroy cache message */
+    NULL,                               /* write evict cache message */
+    H5C__trace_write_expunge_entry_log_msg,
+    H5C__trace_write_flush_cache_log_msg,
+    H5C__trace_write_insert_entry_log_msg,
+    H5C__trace_write_mark_entry_dirty_log_msg,
+    H5C__trace_write_mark_entry_clean_log_msg,
+    H5C__trace_write_mark_unserialized_entry_log_msg,
+    H5C__trace_write_mark_serialized_entry_log_msg,
+    H5C__trace_write_move_entry_log_msg,
+    H5C__trace_write_pin_entry_log_msg,
+    H5C__trace_write_create_fd_log_msg,
+    H5C__trace_write_protect_entry_log_msg,
+    H5C__trace_write_resize_entry_log_msg,
+    H5C__trace_write_unpin_entry_log_msg,
+    H5C__trace_write_destroy_fd_log_msg,
+    H5C__trace_write_unprotect_entry_log_msg,
+    H5C__trace_write_set_cache_config_log_msg,
+    H5C__trace_write_remove_entry_log_msg
+};
+
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_log_message
+ *
+ * Purpose:     Write a message to the log file and flush the file. 
+ *              The message string is neither modified nor freed.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_log_message(H5C_log_trace_udata_t *trace_udata)
+{
+    size_t n_chars;
+    herr_t ret_value = SUCCEED;      /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->outfile);
+    HDassert(trace_udata->message);
+
+    /* Write the log message and flush */
+    n_chars = HDstrlen(trace_udata->message);
+    if((int)n_chars != HDfprintf(trace_udata->outfile, trace_udata->message))
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "error writing log message")
+    HDmemset((void *)(trace_udata->message), 0, (size_t)(n_chars * sizeof(char)));
+            
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_log_message() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C_log_trace_set_up
+ *
+ * Purpose:     Setup for metadata cache logging.
+ *
+ *              Metadata logging is enabled and disabled at two levels. This
+ *              function and the associated tear_down function open and close
+ *              the log file. the start_ and stop_logging functions are then
+ *              used to switch logging on/off. Optionally, logging can begin
+ *              as soon as the log file is opened (set via the start_immediately
+ *              parameter to this function).
+ *
+ *              The log functionality is split between the H5C and H5AC
+ *              packages. Log state and direct log manipulation resides in
+ *              H5C. Log messages are generated in H5AC and sent to
+ *              the H5C__trace_write_log_message function.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5C_log_trace_set_up(H5C_log_info_t *log_info, const char log_location[], int mpi_rank)
+{
+    H5C_log_trace_udata_t *trace_udata = NULL;
+    char *file_name = NULL;
+    size_t n_chars;
+    herr_t ret_value = SUCCEED;      /* Return value */
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity checks */
+    HDassert(log_info);
+    HDassert(log_location);
+
+    /* Set up the class struct */
+    log_info->cls = &H5C_trace_log_class_g;
+
+    /* Allocate memory for the JSON-specific data */
+    if(NULL == (log_info->udata = H5MM_calloc(sizeof(H5C_log_trace_udata_t))))
+        HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "memory allocation failed")
+    trace_udata = (H5C_log_trace_udata_t *)(log_info->udata);
+    
+    /* Allocate memory for the message buffer */
+    if(NULL == (trace_udata->message = (char *)H5MM_calloc(H5C_MAX_TRACE_LOG_MSG_SIZE * sizeof(char))))
+        HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "memory allocation failed")
+
+    /* Possibly fix up the log file name.
+     * The extra 39 characters are for adding the rank to the file name
+     * under parallel HDF5. 39 characters allows > 2^127 processes which
+     * should be enough for anybody.
+     *
+     * allocation size = <path length> + dot + <rank # length> + \0
+     */
+    n_chars = HDstrlen(log_location) + 1 + 39 + 1;
+    if(NULL == (file_name = (char *)H5MM_calloc(n_chars * sizeof(char))))
+        HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "can't allocate memory for mdc log file name manipulation")
+
+    /* Add the rank to the log file name when MPI is in use */
+    if(-1 == mpi_rank)
+        HDsnprintf(file_name, n_chars, "%s", log_location);
+    else
+        HDsnprintf(file_name, n_chars, "%s.%d", log_location, mpi_rank);
+
+    /* Open log file and set it to be unbuffered */
+    if(NULL == (trace_udata->outfile = HDfopen(file_name, "w")))
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "can't create mdc log file")
+    HDsetbuf(trace_udata->outfile, NULL);
+
+    /* Write the header */
+    HDfprintf(trace_udata->outfile, "### HDF5 metadata cache trace file version 1 ###\n");
+
+ done:
+    if(file_name)
+        H5MM_xfree(file_name);
+
+    /* Free and reset the log info struct on errors */
+    if(FAIL == ret_value) {
+        /* Free */
+        if(trace_udata && trace_udata->message)
+            H5MM_xfree(trace_udata->message);
+        if(trace_udata)
+            H5MM_xfree(trace_udata);
+
+        /* Reset */
+        log_info->udata = NULL;
+        log_info->cls = NULL;
+    }
+
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C_log_trace_set_up() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_tear_down_logging
+ *
+ * Purpose:     Tear-down for metadata cache logging.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_tear_down_logging(H5C_log_info_t *log_info)
+{
+    H5C_log_trace_udata_t *trace_udata = NULL;
+    herr_t ret_value = SUCCEED;      /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(log_info);
+
+    /* Alias */
+    trace_udata = (H5C_log_trace_udata_t *)(log_info->udata);
+
+    /* Free the message buffer */
+    H5MM_xfree(trace_udata->message);
+
+    /* Close log file */
+    if(EOF == HDfclose(trace_udata->outfile))
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "problem closing mdc log file")
+    trace_udata->outfile = NULL;
+
+    /* Fre the udata */
+    H5MM_xfree(trace_udata);
+
+    /* Reset the log class info and udata */
+    log_info->cls = NULL;
+    log_info->udata = NULL;
+
+ done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_tear_down_logging() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_expunge_entry_log_msg
+ *
+ * Purpose:     Write a log message for expunge of cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_expunge_entry_log_msg(void *udata, haddr_t address,
+    int type_id, herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE, "H5AC_expunge_entry 0x%lx %d %d\n", 
+            (unsigned long)address, type_id, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_expunge_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_flush_cache_log_msg
+ *
+ * Purpose:     Write a log message for cache flushes.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_flush_cache_log_msg(void *udata, herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE, "H5AC_flush %d\n", 
+            (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_flush_cache_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_insert_entry_log_msg
+ *
+ * Purpose:     Write a log message for insertion of cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_insert_entry_log_msg(void *udata, haddr_t address,
+    int type_id, unsigned flags, size_t size, herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE, "H5AC_insert_entry 0x%lx %d 0x%x %d %d\n", 
+            (unsigned long)address, type_id, flags, (int)size, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_insert_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_mark_entry_dirty_log_msg
+ *
+ * Purpose:     Write a log message for marking cache entries as dirty.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_mark_entry_dirty_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE, "H5AC_mark_entry_dirty 0x%lx %d\n", 
+            (unsigned long)(entry->addr), (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_mark_entry_dirty_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_mark_entry_clean_log_msg
+ *
+ * Purpose:     Write a log message for marking cache entries as clean.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_mark_entry_clean_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE, "H5AC_mark_entry_clean 0x%lx %d\n", 
+            (unsigned long)(entry->addr), (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_mark_entry_clean_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_mark_unserialized_entry_log_msg
+ *
+ * Purpose:     Write a log message for marking cache entries as unserialized.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_mark_unserialized_entry_log_msg(void *udata,
+    const H5C_cache_entry_t *entry, herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE, "H5AC_mark_entry_unserialized 0x%lx %d\n", 
+            (unsigned long)(entry->addr), (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_mark_unserialized_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_mark_serialized_entry_log_msg
+ *
+ * Purpose:     Write a log message for marking cache entries as serialize.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_mark_serialized_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE, "H5AC_mark_entry_serialized 0x%lx %d\n", 
+            (unsigned long)(entry->addr), (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_mark_serialized_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_move_entry_log_msg
+ *
+ * Purpose:     Write a log message for moving a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_move_entry_log_msg(void *udata, haddr_t old_addr, haddr_t new_addr,
+    int type_id, herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE, "H5AC_move_entry 0x%lx 0x%lx %d %d\n", 
+            (unsigned long)old_addr, (unsigned long)new_addr, type_id, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_move_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_pin_entry_log_msg
+ *
+ * Purpose:     Write a log message for pinning a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_pin_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE, "H5AC_pin_protected_entry 0x%lx %d\n", 
+            (unsigned long)(entry->addr), (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_pin_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_create_fd_log_msg
+ *
+ * Purpose:     Write a log message for creating a flush dependency between
+ *              two cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_create_fd_log_msg(void *udata, const H5C_cache_entry_t *parent,
+    const H5C_cache_entry_t *child, herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+    HDassert(parent);
+    HDassert(child);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE, "H5AC_create_flush_dependency 0x%lx 0x%lx %d\n", 
+            (unsigned long)(parent->addr), (unsigned long)(child->addr), (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_create_fd_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_protect_entry_log_msg
+ *
+ * Purpose:     Write a log message for protecting a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_protect_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    int type_id, unsigned flags, herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE, "H5AC_protect 0x%lx %d 0x%x %d %d\n", 
+            (unsigned long)(entry->addr), type_id, flags, (int)(entry->size), (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_protect_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_resize_entry_log_msg
+ *
+ * Purpose:     Write a log message for resizing a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_resize_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    size_t new_size, herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE, "H5AC_resize_entry 0x%lx %d %d\n", 
+            (unsigned long)(entry->addr), (int)new_size, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_resize_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_unpin_entry_log_msg
+ *
+ * Purpose:     Write a log message for unpinning a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_unpin_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE, "H5AC_unpin_entry 0x%lx %d\n", 
+            (unsigned long)(entry->addr), (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_unpin_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_destroy_fd_log_msg
+ *
+ * Purpose:     Write a log message for destroying a flush dependency
+ *              between two cache entries.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_destroy_fd_log_msg(void *udata, const H5C_cache_entry_t *parent,
+    const H5C_cache_entry_t *child, herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+    HDassert(parent);
+    HDassert(child);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE, "H5AC_destroy_flush_dependency 0x%lx 0x%lx %d\n", 
+            (unsigned long)(parent->addr), (unsigned long)(child->addr), (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_destroy_fd_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_unprotect_entry_log_msg
+ *
+ * Purpose:     Write a log message for unprotecting a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_unprotect_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    int type_id, unsigned flags, herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE, "H5AC_unprotect 0x%lx %d 0x%x %d\n", 
+            (unsigned long)(entry->addr), type_id, flags, (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_unprotect_entry_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_set_cache_config_log_msg
+ *
+ * Purpose:     Write a log message for setting the cache configuration.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_set_cache_config_log_msg(void *udata, const H5AC_cache_config_t *config,
+    herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+    HDassert(config);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE,
+            "H5AC_set_cache_auto_resize_config %d %d %d %d \"%s\" %d %d %d %f %d %d %ld %d %f %f %d %f %f %d %d %d %f %f %d %d %d %d %f %zu %d %d\n",
+            config->version,
+            (int)(config->rpt_fcn_enabled),
+            (int)(config->open_trace_file),
+            (int)(config->close_trace_file),
+            config->trace_file_name,
+            (int)(config->evictions_enabled),
+            (int)(config->set_initial_size),
+            (int)(config->initial_size),
+            config->min_clean_fraction,
+            (int)(config->max_size),
+            (int)(config->min_size),
+            config->epoch_length,
+            (int)(config->incr_mode),
+            config->lower_hr_threshold,
+            config->increment,
+            (int)(config->flash_incr_mode),
+            config->flash_multiple,
+            config->flash_threshold,
+            (int)(config->apply_max_increment),
+            (int)(config->max_increment),
+            (int)(config->decr_mode),
+            config->upper_hr_threshold,
+            config->decrement,
+            (int)(config->apply_max_decrement),
+            (int)(config->max_decrement),
+            config->epochs_before_eviction,
+            (int)(config->apply_empty_reserve),
+            config->empty_reserve,
+            config->dirty_bytes_threshold,
+            config->metadata_write_strategy,
+            (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_set_cache_config_log_msg() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5C__trace_write_remove_entry_log_msg
+ *
+ * Purpose:     Write a log message for removing a cache entry.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:  Dana Robinson
+ *              Fall 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5C__trace_write_remove_entry_log_msg(void *udata, const H5C_cache_entry_t *entry,
+    herr_t fxn_ret_value)
+{
+    H5C_log_trace_udata_t *trace_udata = (H5C_log_trace_udata_t *)(udata);
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    /* Sanity checks */
+    HDassert(trace_udata);
+    HDassert(trace_udata->message);
+    HDassert(entry);
+
+    /* Create the log message string */
+    HDsnprintf(trace_udata->message, H5C_MAX_TRACE_LOG_MSG_SIZE, "H5AC_remove_entry 0x%lx %d\n", 
+            (unsigned long)(entry->addr), (int)fxn_ret_value);
+
+    /* Write the log message to the file */
+    if(H5C__trace_write_log_message(trace_udata) < 0)
+        HGOTO_ERROR(H5E_CACHE, H5E_LOGGING, FAIL, "unable to emit log message")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5C__trace_write_remove_entry_log_msg() */
+
diff --git a/src/H5Cpkg.h b/src/H5Cpkg.h
index 98d7a01..9201afb 100644
--- a/src/H5Cpkg.h
+++ b/src/H5Cpkg.h
@@ -37,6 +37,7 @@
 #include "H5Cprivate.h"
 
 /* Other private headers needed by this file */
+#include "H5Clog.h"             /* Cache logging */
 #include "H5SLprivate.h"        /* Skip lists */
 
 /**************************/
@@ -3497,40 +3498,8 @@ typedef struct H5C_tag_info_t {
  * flush_in_progress: Boolean flag indicating whether a flush is in
  * 		progress.
  *
- * trace_file_ptr:  File pointer pointing to the trace file, which is used
- *              to record cache operations for use in simulations and design
- *              studies.  This field will usually be NULL, indicating that
- *              no trace file should be recorded.
- *
- *              Since much of the code supporting the parallel metadata
- *              cache is in H5AC, we don't write the trace file from
- *              H5C.  Instead, H5AC reads the trace_file_ptr as needed.
- *
- *              When we get to using H5C in other places, we may add
- *              code to write trace file data at the H5C level as well.
- *
- * logging_enabled: Boolean flag indicating whether cache logging
- *              which is used to record cache operations for use in
- *              debugging and performance analysis. When this flag is set
- *              to TRUE, it means that the log file is open and ready to
- *              receive log entries. It does NOT mean that cache operations
- *              are currently being recorded. That is controlled by the
- *              currently_logging flag (below).
- *
- *              Since much of the code supporting the parallel metadata
- *              cache is in H5AC, we don't write the trace file from
- *              H5C.  Instead, H5AC reads the trace_file_ptr as needed.
- *
- *              When we get to using H5C in other places, we may add
- *              code to write trace file data at the H5C level as well.
- *
- * currently_logging: Boolean flag that indicates if cache operations are
- *              currently being logged. This flag is flipped by the
- *              H5Fstart/stop_mdc_logging functions.
- *
- * log_file_ptr:  File pointer pointing to the log file. The I/O functions
- *              in stdio.h are used to write to the log file regardless of
- *              the VFD selected.
+ * log_info:    Information used by the MDC logging functionality.
+ *              Described in H5Clog.h.
  *
  * aux_ptr:	Pointer to void used to allow wrapper code to associate
  *		its data with an instance of H5C_t.  The H5C cache code
@@ -4676,10 +4645,7 @@ typedef struct H5C_tag_info_t {
 struct H5C_t {
     uint32_t			magic;
     hbool_t			flush_in_progress;
-    FILE *			trace_file_ptr;
-    hbool_t                     logging_enabled;
-    hbool_t                     currently_logging;
-    FILE *			log_file_ptr;
+    H5C_log_info_t  *log_info;
     void *			aux_ptr;
     int32_t			max_type_id;
     const H5C_class_t * const   *class_table_ptr;
diff --git a/src/H5Cprivate.h b/src/H5Cprivate.h
index 38a86ee..c39c1df 100644
--- a/src/H5Cprivate.h
+++ b/src/H5Cprivate.h
@@ -2219,6 +2219,12 @@ typedef struct H5C_cache_image_ctl_t {
     unsigned				flags;
 } H5C_cache_image_ctl_t;
 
+/* The cache logging output style */
+typedef enum H5C_log_style_t {
+    H5C_LOG_STYLE_JSON,
+    H5C_LOG_STYLE_TRACE
+} H5C_log_style_t;
+
 /***************************************/
 /* Library-private Function Prototypes */
 /***************************************/
@@ -2227,13 +2233,6 @@ H5_DLL H5C_t *H5C_create(size_t max_cache_size, size_t min_clean_size,
     int max_type_id, const H5C_class_t * const *class_table_ptr,
     H5C_write_permitted_func_t check_write_permitted, hbool_t write_permitted,
     H5C_log_flush_func_t log_flush, void *aux_ptr);
-H5_DLL herr_t H5C_set_up_logging(H5C_t *cache_ptr, const char log_location[], hbool_t start_immediately);
-H5_DLL herr_t H5C_tear_down_logging(H5C_t *cache_ptr);
-H5_DLL herr_t H5C_start_logging(H5C_t *cache_ptr);
-H5_DLL herr_t H5C_stop_logging(H5C_t *cache_ptr);
-H5_DLL herr_t H5C_get_logging_status(const H5C_t *cache_ptr, /*OUT*/ hbool_t *is_enabled,
-    /*OUT*/ hbool_t *is_currently_logging);
-H5_DLL herr_t H5C_write_log_message(const H5C_t *cache_ptr, const char message[]);
 H5_DLL void H5C_def_auto_resize_rpt_fcn(H5C_t *cache_ptr, int32_t version,
     double hit_rate, enum H5C_resize_status status,
     size_t old_max_cache_size, size_t new_max_cache_size,
@@ -2267,8 +2266,6 @@ H5_DLL herr_t H5C_get_entry_status(const H5F_t *f, haddr_t addr,
     hbool_t *image_up_to_date_ptr);
 H5_DLL herr_t H5C_get_evictions_enabled(const H5C_t *cache_ptr, hbool_t *evictions_enabled_ptr);
 H5_DLL void * H5C_get_aux_ptr(const H5C_t *cache_ptr);
-H5_DLL FILE *H5C_get_trace_file_ptr(const H5C_t *cache_ptr);
-H5_DLL FILE *H5C_get_trace_file_ptr_from_entry(const H5C_cache_entry_t *entry_ptr);
 H5_DLL herr_t H5C_image_stats(H5C_t * cache_ptr, hbool_t print_header);
 H5_DLL herr_t H5C_insert_entry(H5F_t *f, const H5C_class_t *type, haddr_t addr,
     void *thing, unsigned int flags);
@@ -2292,7 +2289,6 @@ H5_DLL herr_t H5C_set_cache_image_config(const H5F_t *f, H5C_t *cache_ptr,
     H5C_cache_image_ctl_t *config_ptr);
 H5_DLL herr_t H5C_set_evictions_enabled(H5C_t *cache_ptr, hbool_t evictions_enabled);
 H5_DLL herr_t H5C_set_prefix(H5C_t *cache_ptr, char *prefix);
-H5_DLL herr_t H5C_set_trace_file_ptr(H5C_t *cache_ptr, FILE *trace_file_ptr);
 H5_DLL herr_t H5C_stats(H5C_t *cache_ptr, const char *cache_name,
     hbool_t display_detailed_stats);
 H5_DLL void H5C_stats__reset(H5C_t *cache_ptr);
@@ -2316,6 +2312,11 @@ H5_DLL herr_t H5C_cache_image_status(H5F_t * f, hbool_t *load_ci_ptr,
 H5_DLL hbool_t H5C_cache_image_pending(const H5C_t *cache_ptr);
 H5_DLL herr_t H5C_get_mdc_image_info(H5C_t *cache_ptr, haddr_t *image_addr, hsize_t *image_len);
 
+/* Logging functions */
+H5_DLL herr_t H5C_start_logging(H5C_t *cache);
+H5_DLL herr_t H5C_stop_logging(H5C_t *cache);
+H5_DLL herr_t H5C_get_logging_status(const H5C_t *cache, /*OUT*/ hbool_t *is_enabled, /*OUT*/ hbool_t *is_currently_logging);
+
 #ifdef H5_HAVE_PARALLEL
 H5_DLL herr_t H5C_apply_candidate_list(H5F_t *f, H5C_t *cache_ptr,
     unsigned num_candidates, haddr_t *candidates_list_ptr, int mpi_rank,
diff --git a/src/H5Cquery.c b/src/H5Cquery.c
index e4f3133..51ce1c2 100644
--- a/src/H5Cquery.c
+++ b/src/H5Cquery.c
@@ -351,64 +351,6 @@ H5C_get_aux_ptr(const H5C_t *cache_ptr)
 
 
 /*-------------------------------------------------------------------------
- * Function:    H5C_get_trace_file_ptr
- *
- * Purpose:     Get the trace_file_ptr field from the cache.
- *
- *              This field will either be NULL (which indicates that trace
- *              file logging is turned off), or contain a pointer to the
- *              open file to which trace file data is to be written.
- *
- * Return:      Non-NULL trace file pointer (can't fail)
- *
- * Programmer:  John Mainzer
- *              1/20/06
- *
- *-------------------------------------------------------------------------
- */
-FILE *
-H5C_get_trace_file_ptr(const H5C_t *cache_ptr)
-{
-    FUNC_ENTER_NOAPI_NOERR
-
-    /* Check arguments */
-    HDassert(cache_ptr);
-    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
-
-    FUNC_LEAVE_NOAPI(cache_ptr->trace_file_ptr)
-} /* H5C_get_trace_file_ptr() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5C_get_trace_file_ptr_from_entry
- *
- * Purpose:     Get the trace_file_ptr field from the cache, via an entry.
- *
- *              This field will either be NULL (which indicates that trace
- *              file logging is turned off), or contain a pointer to the
- *              open file to which trace file data is to be written.
- *
- * Return:      Non-NULL trace file pointer (can't fail)
- *
- * Programmer:  Quincey Koziol
- *              6/9/08
- *
- *-------------------------------------------------------------------------
- */
-FILE *
-H5C_get_trace_file_ptr_from_entry(const H5C_cache_entry_t *entry_ptr)
-{
-    FUNC_ENTER_NOAPI_NOERR
-
-    /* Sanity checks */
-    HDassert(entry_ptr);
-    HDassert(entry_ptr->cache_ptr);
-
-    FUNC_LEAVE_NOAPI(H5C_get_trace_file_ptr(entry_ptr->cache_ptr))
-} /* H5C_get_trace_file_ptr_from_entry() */
-
-
-/*-------------------------------------------------------------------------
  * Function:    H5C_get_entry_ring
  *
  * Purpose:     Given a file address, retrieve the ring for an entry at that
diff --git a/src/H5D.c b/src/H5D.c
index 1e16868..fc350f2 100644
--- a/src/H5D.c
+++ b/src/H5D.c
@@ -29,6 +29,8 @@
 #include "H5Iprivate.h"         /* IDs                                      */
 #include "H5VLprivate.h"        /* Virtual Object Layer                     */
 
+#include "H5VLnative_private.h" /* Native VOL connector                     */
+
 
 /****************/
 /* Local Macros */
@@ -1027,7 +1029,7 @@ H5Dformat_convert(hid_t dset_id)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "can't set collective metadata read info")
 
     /* Convert the dataset */
-    if(H5VL_dataset_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_DATASET_FORMAT_CONVERT) < 0)
+    if(H5VL_dataset_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_DATASET_FORMAT_CONVERT) < 0)
         HGOTO_ERROR(H5E_DATASET, H5E_INTERNAL, FAIL, "can't convert dataset format")
 
 done:
@@ -1063,7 +1065,7 @@ H5Dget_chunk_index_type(hid_t dset_id, H5D_chunk_index_t *idx_type)
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "idx_type parameter cannot be NULL")
 
     /* Get the chunk indexing type */
-    if(H5VL_dataset_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_DATASET_GET_CHUNK_INDEX_TYPE, idx_type) < 0)
+    if(H5VL_dataset_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_DATASET_GET_CHUNK_INDEX_TYPE, idx_type) < 0)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get chunk index type")
 
 done:
@@ -1104,7 +1106,7 @@ H5Dget_chunk_storage_size(hid_t dset_id, const hsize_t *offset, hsize_t *chunk_n
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "chunk_nbytes parameter cannot be NULL")
 
     /* Get the dataset creation property list */
-    if(H5VL_dataset_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_DATASET_GET_CHUNK_STORAGE_SIZE, offset, chunk_nbytes) < 0)
+    if(H5VL_dataset_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_DATASET_GET_CHUNK_STORAGE_SIZE, offset, chunk_nbytes) < 0)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get storage size of chunk")
 
 done:
diff --git a/src/H5Dchunk.c b/src/H5Dchunk.c
index 91f3b91..e165569 100644
--- a/src/H5Dchunk.c
+++ b/src/H5Dchunk.c
@@ -1493,6 +1493,9 @@ H5D__create_chunk_map_single(H5D_chunk_map_t *fm, const H5D_io_info_t
 
     /* Set chunk location & hyperslab size */
     for(u = 0; u < fm->f_ndims; u++) {
+        /* Validate this chunk dimension */
+        if(fm->layout->u.chunk.dim[u] == 0)
+            HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "chunk size must be > 0, dim = %u ", u)
         HDassert(sel_start[u] == sel_end[u]);
         chunk_info->scaled[u] = sel_start[u] / fm->layout->u.chunk.dim[u];
         coords[u] = chunk_info->scaled[u] * fm->layout->u.chunk.dim[u];
@@ -1580,6 +1583,9 @@ H5D__create_chunk_file_map_hyper(H5D_chunk_map_t *fm, const H5D_io_info_t
 
     /* Set initial chunk location & hyperslab size */
     for(u = 0; u < fm->f_ndims; u++) {
+        /* Validate this chunk dimension */
+        if(fm->layout->u.chunk.dim[u] == 0)
+            HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "chunk size must be > 0, dim = %u ", u)
         scaled[u] = start_scaled[u] = sel_start[u] / fm->layout->u.chunk.dim[u];
         coords[u] = start_coords[u] = scaled[u] * fm->layout->u.chunk.dim[u];
         end[u] = (coords[u] + fm->chunk_dim[u]) - 1;
@@ -1992,13 +1998,13 @@ H5D__chunk_mem_cb(void H5_ATTR_UNUSED *elem, const H5T_t H5_ATTR_UNUSED *type, u
          */
         /* Get the chunk node from the skip list */
         if(NULL == (chunk_info = (H5D_chunk_info_t *)H5SL_search(fm->sel_chunks, &chunk_index)))
-            HGOTO_ERROR(H5E_DATASPACE, H5E_NOTFOUND, FAIL, "can't locate chunk in skip list")
+            HGOTO_ERROR(H5E_DATASPACE, H5E_NOTFOUND, H5_ITER_ERROR, "can't locate chunk in skip list")
 
         /* Check if the chunk already has a memory space */
         if(NULL == chunk_info->mspace) {
             /* Copy the template memory chunk dataspace */
             if(NULL == (chunk_info->mspace = H5S_copy(fm->mchunk_tmpl, FALSE, FALSE)))
-                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "unable to copy file space")
+                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, H5_ITER_ERROR, "unable to copy file space")
         } /* end else */
 
         /* Update the "last chunk seen" information */
@@ -2008,21 +2014,21 @@ H5D__chunk_mem_cb(void H5_ATTR_UNUSED *elem, const H5T_t H5_ATTR_UNUSED *type, u
 
     /* Get coordinates of selection iterator for memory */
     if(H5S_SELECT_ITER_COORDS(&fm->mem_iter, coords_in_mem) < 0)
-        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "unable to get iterator coordinates")
+        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, H5_ITER_ERROR, "unable to get iterator coordinates")
 
     /* Add point to memory selection for chunk */
     if(fm->msel_type == H5S_SEL_POINTS) {
         if(H5S_select_elements(chunk_info->mspace, H5S_SELECT_APPEND, (size_t)1, coords_in_mem) < 0)
-            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTSELECT, FAIL, "unable to select element")
+            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTSELECT, H5_ITER_ERROR, "unable to select element")
     } /* end if */
     else {
         if(H5S_hyper_add_span_element(chunk_info->mspace, fm->m_ndims, coords_in_mem) < 0)
-            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTSELECT, FAIL, "unable to select element")
+            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTSELECT, H5_ITER_ERROR, "unable to select element")
     } /* end else */
 
     /* Move memory selection iterator to next element in selection */
     if(H5S_SELECT_ITER_NEXT(&fm->mem_iter, (size_t)1) < 0)
-        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTNEXT, FAIL, "unable to move to next iterator location")
+        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTNEXT, H5_ITER_ERROR, "unable to move to next iterator location")
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
@@ -4043,6 +4049,9 @@ H5D__chunk_allocate(const H5D_io_info_t *io_info, hbool_t full_overwrite, hsize_
      * assume here that all elements of space_dim are > 0.  This is checked at
      * the top of this function. */
     for(op_dim=0; op_dim<space_ndims; op_dim++) {
+        /* Validate this chunk dimension */
+        if(chunk_dim[op_dim] == 0)
+            HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "chunk size must be > 0, dim = %u ", op_dim)
         min_unalloc[op_dim] = (old_dim[op_dim] + chunk_dim[op_dim] - 1) / chunk_dim[op_dim];
         max_unalloc[op_dim] = (space_dim[op_dim] - 1) / chunk_dim[op_dim];
 
@@ -4484,13 +4493,17 @@ H5D__chunk_update_old_edge_chunks(H5D_t *dset, hsize_t old_dim[])
         /* Start off with this dimension marked as not needing to be modified */
         new_full_dim[op_dim] = FALSE;
 
+        /* Validate this chunk dimension */
+        if(chunk_dim[op_dim] == 0)
+            HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "chunk size must be > 0, dim = %u ", op_dim)
+
         /* Calculate offset of first previously incomplete chunk in this
          * dimension */
-	old_edge_chunk_sc[op_dim] = (old_dim[op_dim] / chunk_dim[op_dim]);
+	    old_edge_chunk_sc[op_dim] = (old_dim[op_dim] / chunk_dim[op_dim]);
 
         /* Calculate the largest offset of chunks that might need to be
          * modified in this dimension */
-	max_edge_chunk_sc[op_dim] = MIN((old_dim[op_dim] - 1) / chunk_dim[op_dim],
+	    max_edge_chunk_sc[op_dim] = MIN((old_dim[op_dim] - 1) / chunk_dim[op_dim],
 					  MAX((space_dim[op_dim] / chunk_dim[op_dim]), 1) - 1);
 
         /* Check for old_dim aligned with chunk boundary in this dimension, if
@@ -4626,6 +4639,8 @@ H5D__chunk_collective_fill(const H5D_t *dset, H5D_chunk_coll_info_t *chunk_info,
         HGOTO_ERROR(H5E_INTERNAL, H5E_MPI, FAIL, "Can't retrieve MPI size")
 
     /* Distribute evenly the number of blocks between processes. */
+    if(mpi_size == 0)
+        HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "Resulted in division by zero")
     num_blocks = chunk_info->num_io / mpi_size; /* value should be the same on all procs */
 
     /* after evenly distributing the blocks between processes, are
@@ -5066,6 +5081,10 @@ H5D__chunk_prune_by_extent(H5D_t *dset, const hsize_t *old_dim)
     HDmemset(min_mod_chunk_sc, 0, sizeof(min_mod_chunk_sc));
     HDmemset(max_mod_chunk_sc, 0, sizeof(max_mod_chunk_sc));
     for(op_dim = 0; op_dim < (unsigned)space_ndims; op_dim++) {
+        /* Validate this chunk dimension */
+        if(chunk_dim[op_dim] == 0)
+            HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "chunk size must be > 0, dim = %u ", op_dim)
+
         /* Calculate the largest offset of chunks that might need to be
          * modified in this dimension */
         max_mod_chunk_sc[op_dim] = (old_dim[op_dim] - 1) / chunk_dim[op_dim];
@@ -5721,9 +5740,12 @@ H5D__chunk_copy_cb(const H5D_chunk_rec_t *chunk_rec, void *_udata)
         /* (background buffer has already been zeroed out, if not expanding) */
         if(udata->cpy_info->expand_ref) {
             size_t ref_count;
+            size_t dt_size;
 
             /* Determine # of reference elements to copy */
-            ref_count = nbytes / H5T_get_size(udata->dt_src);
+            if((dt_size = H5T_get_size(udata->dt_src)) == 0)
+                HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "size must not be 0")
+            ref_count = nbytes / dt_size;
 
             /* Copy the reference elements */
             if(H5O_copy_expand_ref(udata->file_src, buf, udata->idx_info_dst->f, bkg, ref_count, H5T_get_ref_type(udata->dt_src), udata->cpy_info) < 0)
diff --git a/src/H5Dint.c b/src/H5Dint.c
index 6bb3343..7eb1aaf 100644
--- a/src/H5Dint.c
+++ b/src/H5Dint.c
@@ -25,6 +25,7 @@
 #include "H5CXprivate.h"        /* API Contexts                             */
 #include "H5Dpkg.h"             /* Datasets                                 */
 #include "H5Eprivate.h"         /* Error handling                           */
+#include "H5Fprivate.h"         /* Files                                    */
 #include "H5FLprivate.h"        /* Free Lists                               */
 #include "H5FOprivate.h"        /* File objects                             */
 #include "H5Iprivate.h"         /* IDs                                      */
@@ -59,6 +60,9 @@ static herr_t H5D__init_storage(const H5D_io_info_t *io_info, hbool_t full_overw
         hsize_t old_dim[]);
 static herr_t H5D__append_flush_setup(H5D_t *dset, hid_t dapl_id);
 static herr_t H5D__close_cb(H5VL_object_t *dset_vol_obj);
+static herr_t H5D__use_minimized_dset_headers(H5F_t *file, H5D_t *dset, hbool_t *minimize);
+static herr_t H5D__prepare_minimized_oh(H5F_t *file, H5D_t *dset, H5O_loc_t *oloc);
+static size_t H5D__calculate_minimum_header_size(H5F_t *file, H5D_t *dset, H5O_t *ohdr);
 
 
 /*********************/
@@ -658,6 +662,211 @@ done:
 
 
 /*-------------------------------------------------------------------------
+ * Function:   H5D__use_minimized_dset_headers
+ *
+ * Purpose:    Compartmentalize check for file- or dcpl-set values indicating
+ *             to create a "minimized" dataset object header.
+ *             Upon success, write resulting value to out pointer `minimize`.
+ *
+ * Return:     Success: SUCCEED (0) (non-negative value)
+ *             Failure: FAIL (-1) (negative value)
+ *
+ * Programmer: Jacob Smith
+ *             16 August 2018
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5D__use_minimized_dset_headers(H5F_t *file, H5D_t *dset, hbool_t *minimize)
+{
+    H5P_genplist_t *plist     = NULL;
+    herr_t          ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI_NOINIT;
+
+    HDassert(file);
+    HDassert(dset);
+    HDassert(minimize);
+
+    plist = H5P_object_verify(dset->shared->dcpl_id, H5P_DATASET_CREATE);
+    if(NULL == plist)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "problem getting dcpl")
+    if(H5P_get(plist, H5D_CRT_MIN_DSET_HDR_SIZE_NAME, minimize) == FAIL)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get minimize value from dcpl")
+
+    if(FALSE == *minimize)
+        *minimize = H5F_get_min_dset_ohdr(file);
+
+done:
+    if(FAIL == ret_value)
+        *minimize = FALSE;
+    FUNC_LEAVE_NOAPI(ret_value);
+} /* H5D__use_minimized_dset_headers */
+
+
+/*-------------------------------------------------------------------------
+ * Function:   H5D__calculate_minimium_header_size
+ *
+ * Purpose:    Calculate the size required for the minimized object header.
+ *
+ * Return:     Success: Positive value > 0
+ *             Failure: 0
+ *
+ * Programmer: Jacob Smith
+ *             16 August 2018
+ *-------------------------------------------------------------------------
+ */
+static size_t
+H5D__calculate_minimum_header_size(H5F_t *file, H5D_t *dset, H5O_t *ohdr)
+{
+    H5T_t      *type             = NULL;
+    H5O_fill_t *fill_prop        = NULL;
+    hbool_t     use_at_least_v18 = FALSE;
+    const char  continuation[1]  = ""; /* requred for work-around */
+    size_t      get_value        = 0;
+    size_t      ret_value        = 0;
+
+    FUNC_ENTER_NOAPI_NOINIT;
+
+    HDassert(file);
+    HDassert(dset);
+    HDassert(ohdr);
+
+    type = dset->shared->type;
+    fill_prop = &(dset->shared->dcpl_cache.fill);
+    use_at_least_v18 = (H5F_LOW_BOUND(file) >= H5F_LIBVER_V18);
+
+    /* Datatype message size */
+    get_value = H5O_msg_size_oh(file, ohdr, H5O_DTYPE_ID, type, 0);
+    if (get_value == 0)
+        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, 0, "Can't get size of datatype message")
+    ret_value += get_value;
+
+    /* Shared Dataspace message size */
+    get_value = H5O_msg_size_oh(file, ohdr, H5O_SDSPACE_ID, dset->shared->space, 0);
+    if (get_value == 0)
+        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, 0, "can't get size of dataspace message")
+    ret_value += get_value;
+
+    /* "Layout" message size */
+    get_value = H5O_msg_size_oh(file, ohdr, H5O_LAYOUT_ID, &dset->shared->layout, 0);
+    if (get_value == 0)
+        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, 0, "can't get size of layout message")
+    ret_value += get_value;
+
+    /* Fill Value message size */
+    get_value = H5O_msg_size_oh(file, ohdr, H5O_FILL_NEW_ID, fill_prop, 0);
+    if (get_value == 0)
+        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, 0, "can't get size of fill value message")
+    ret_value += get_value;
+
+    /* "Continuation" message size */
+    /* message pointer "continuation" is unused by raw get function, however,
+     * a null pointer would be intercepted by an assert in H5O_msg_size_oh().
+     */
+    get_value = H5O_msg_size_oh(file, ohdr, H5O_CONT_ID, continuation, 0);
+    if (get_value == 0)
+        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, 0, "can't get size of continuation message")
+    ret_value += get_value;
+
+    /* Fill Value (backwards compatability) message size */
+    if(fill_prop->buf && !use_at_least_v18) {
+        H5O_fill_t old_fill_prop; /* Copy for writing "old" fill value */
+
+        /* Shallow copy the fill value property */
+        /* guards against shared component modification */
+        HDmemcpy(&old_fill_prop, fill_prop, sizeof(old_fill_prop));
+
+        if (H5O_msg_reset_share(H5O_FILL_ID, &old_fill_prop) < 0)
+            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, 0, "can't reset the copied fill property")
+
+        get_value = H5O_msg_size_oh(file, ohdr, H5O_FILL_ID, &old_fill_prop, 0);
+        if (get_value == 0)
+            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, 0, "can't get size of fill value (backwards compat) message")
+        ret_value += get_value;
+    }
+
+    /* Filter/Pipeline message size */
+    if(H5D_CHUNKED == dset->shared->layout.type) {
+        H5O_pline_t *pline = &dset->shared->dcpl_cache.pline;
+        if(pline->nused > 0) {
+            get_value = H5O_msg_size_oh(file, ohdr, H5O_PLINE_ID, pline, 0);
+            if (get_value == 0)
+                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, 0, "can't get size of filter message")
+            ret_value += get_value;
+        }
+    }
+
+    /* External File Link message size */
+    if(dset->shared->dcpl_cache.efl.nused > 0) {
+        get_value = H5O_msg_size_oh(file, ohdr, H5O_EFL_ID, &dset->shared->dcpl_cache.efl, 0);
+        if (get_value == 0)
+            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, 0, "can't get size of external file link message")
+        ret_value += get_value;
+    }
+
+    /* Modification Time message size */
+    if(H5O_HDR_STORE_TIMES & H5O_OH_GET_FLAGS(ohdr)) {
+        HDassert(H5O_OH_GET_VERSION(ohdr) >= 1); /* 1 :: H5O_VERSION_1 (H5Opkg.h) */
+
+        if(H5O_OH_GET_VERSION(ohdr) == 1) {
+            /* v1 object headers store modification time as a message */
+            time_t mtime;
+            get_value = H5O_msg_size_oh(file, ohdr, H5O_MTIME_NEW_ID, &mtime, 0);
+            if (get_value == 0)
+                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, 0, "can't get size of modification time message")
+            ret_value += get_value;
+        }
+    }
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value);
+} /* H5D__calculate_minimum_header_size */
+
+
+/*-------------------------------------------------------------------------
+ * Function:   H5D__prepare_minimized_oh
+ *
+ * Purpose:    Create an object header (H5O_t) allocated with the smallest
+ *             possible size.
+ *
+ * Return:     Success: SUCCEED (0) (non-negative value)
+ *             Failure: FAIL (-1) (negative value)
+ *
+ * Programmer: Jacob Smith
+ *             16 August 2018
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5D__prepare_minimized_oh(H5F_t *file, H5D_t *dset, H5O_loc_t *oloc)
+{
+    H5O_t  *oh        = NULL;
+    size_t  ohdr_size = 0;
+    herr_t  ret_value = SUCCEED;
+
+    FUNC_ENTER_NOAPI_NOINIT;
+
+    HDassert(file);
+    HDassert(dset);
+    HDassert(oloc);
+
+    oh = H5O__create_ohdr(file, dset->shared->dcpl_id);
+    if(NULL == oh)
+        HGOTO_ERROR(H5E_OHDR, H5E_BADVALUE, FAIL, "can't instantiate object header")
+
+    ohdr_size = H5D__calculate_minimum_header_size(file, dset, oh);
+    if (ohdr_size == 0)
+       HGOTO_ERROR(H5E_OHDR, H5E_BADVALUE, FAIL, "computed header size is invalid")
+
+    /* Special allocation of space for compact datsets is handled by the call here. */
+    if(H5O__apply_ohdr(file, oh, dset->shared->dcpl_id, ohdr_size, (size_t)1, oloc) == FAIL)
+        HGOTO_ERROR(H5E_OHDR, H5E_BADVALUE, FAIL, "can't apply object header to file")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value);
+} /* H5D__prepare_minimized_oh */
+
+
+/*-------------------------------------------------------------------------
  * Function: H5D__update_oh_info
  *
  * Purpose:  Create and fill object header for dataset
@@ -669,17 +878,18 @@ done:
 static herr_t
 H5D__update_oh_info(H5F_t *file, H5D_t *dset, hid_t dapl_id)
 {
-    H5O_t              *oh = NULL;      /* Pointer to dataset's object header */
-    size_t              ohdr_size = H5D_MINHDR_SIZE;    /* Size of dataset's object header */
-    H5O_loc_t          *oloc = NULL;    /* Dataset's object location */
-    H5O_layout_t       *layout;         /* Dataset's layout information */
-    H5T_t              *type;           /* Dataset's datatype */
-    H5O_fill_t         *fill_prop;      /* Pointer to dataset's fill value information */
-    H5D_fill_value_t    fill_status;    /* Fill value status */
-    hbool_t             fill_changed = FALSE;   /* Flag indicating the fill value was changed */
-    hbool_t             layout_init = FALSE;    /* Flag to indicate that chunk information was initialized */
-    hbool_t             use_at_least_v18;       /* Flag indicating to use at least v18 format versions */
-    herr_t ret_value = SUCCEED;         /* Return value */
+    H5O_t            *oh = NULL;      /* Pointer to dataset's object header */
+    size_t            ohdr_size = H5D_MINHDR_SIZE;    /* Size of dataset's object header */
+    H5O_loc_t        *oloc = NULL;    /* Dataset's object location */
+    H5O_layout_t     *layout;         /* Dataset's layout information */
+    H5T_t            *type;           /* Dataset's datatype */
+    H5O_fill_t       *fill_prop;      /* Pointer to dataset's fill value information */
+    H5D_fill_value_t  fill_status;    /* Fill value status */
+    hbool_t           fill_changed = FALSE;   /* Flag indicating the fill value was changed */
+    hbool_t           layout_init = FALSE;    /* Flag to indicate that chunk information was initialized */
+    hbool_t           use_at_least_v18;       /* Flag indicating to use at least v18 format versions */
+    hbool_t           minimize_header = FALSE;
+    herr_t            ret_value = SUCCEED;         /* Return value */
 
     FUNC_ENTER_STATIC
 
@@ -747,13 +957,24 @@ H5D__update_oh_info(H5F_t *file, H5D_t *dset, hid_t dapl_id)
             HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set fill value info")
     } /* end if */
 
-    /* Add the dataset's raw data size to the size of the header, if the raw data will be stored as compact */
-    if(layout->type == H5D_COMPACT)
-        ohdr_size += layout->storage.u.compact.size;
+    if(H5D__use_minimized_dset_headers(file, dset, &minimize_header) == FAIL)
+        HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get minimize settings")
+
+    if(TRUE == minimize_header) {
+        if(H5D__prepare_minimized_oh(file, dset, oloc) == FAIL)
+            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't create minimized dataset object header")
+    } else {
+        /* Add the dataset's raw data size to the size of the header, if the
+         * raw data will be stored as compact
+         */
+        if(H5D_COMPACT == layout->type)
+            ohdr_size += layout->storage.u.compact.size;
+
+        /* Create an object header for the dataset */
+        if(H5O_create(file, ohdr_size, (size_t)1, dset->shared->dcpl_id, oloc/*out*/) < 0)
+            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to create dataset object header")
+    } /* If use minimum/standard object header space */
 
-    /* Create an object header for the dataset */
-    if(H5O_create(file, ohdr_size, (size_t)1, dset->shared->dcpl_id, oloc/*out*/) < 0)
-        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to create dataset object header")
     HDassert(file == dset->oloc.file);
 
     /* Pin the object header */
@@ -910,7 +1131,7 @@ H5D__build_file_prefix(const H5D_t *dset, hid_t dapl_id, const char *prefix_type
             HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
     } /* end if */
     else {
-        if (HDstrncmp(prefix, "${ORIGIN}", HDstrlen("${ORIGIN}")) == 0) {
+        if(HDstrncmp(prefix, "${ORIGIN}", HDstrlen("${ORIGIN}")) == 0) {
             /* Replace ${ORIGIN} at beginning of prefix by directory of HDF5 file */
             filepath_len = HDstrlen(filepath);
             prefix_len = HDstrlen(prefix);
diff --git a/src/H5Dio.c b/src/H5Dio.c
index f977b0e..607bfcf 100644
--- a/src/H5Dio.c
+++ b/src/H5Dio.c
@@ -30,6 +30,8 @@
 #include "H5MMprivate.h"        /* Memory management                        */
 #include "H5Sprivate.h"         /* Dataspace                                */
 
+#include "H5VLnative_private.h" /* Native VOL connector                     */
+
 #ifdef H5_HAVE_PARALLEL
 /* Remove this if H5R_DATASET_REGION is no longer used in this file */
 #include "H5Rpublic.h"
@@ -242,7 +244,7 @@ H5Dread_chunk(hid_t dset_id, hid_t dxpl_id, const hsize_t *offset, uint32_t *fil
     H5CX_set_dxpl(dxpl_id);
 
     /* Read the raw chunk */
-    if(H5VL_dataset_optional(vol_obj, dxpl_id, H5_REQUEST_NULL, H5VL_DATASET_CHUNK_READ, offset, filters, buf) < 0)
+    if(H5VL_dataset_optional(vol_obj, dxpl_id, H5_REQUEST_NULL, H5VL_NATIVE_DATASET_CHUNK_READ, offset, filters, buf) < 0)
         HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "can't read unprocessed chunk data")
 
 done:
@@ -370,7 +372,7 @@ H5Dwrite_chunk(hid_t dset_id, hid_t dxpl_id, uint32_t filters, const hsize_t *of
     H5CX_set_dxpl(dxpl_id);
 
     /* Write chunk */
-    if(H5VL_dataset_optional(vol_obj, dxpl_id, H5_REQUEST_NULL, H5VL_DATASET_CHUNK_WRITE, filters, offset, data_size_32, buf) < 0)
+    if(H5VL_dataset_optional(vol_obj, dxpl_id, H5_REQUEST_NULL, H5VL_NATIVE_DATASET_CHUNK_WRITE, filters, offset, data_size_32, buf) < 0)
         HGOTO_ERROR(H5E_DATASET, H5E_WRITEERROR, FAIL, "can't write unprocessed chunk data")
 
 done:
@@ -655,22 +657,12 @@ H5D__write(H5D_t *dataset, hid_t mem_type_id, const H5S_t *mem_space,
 
     /* Various MPI based checks */
 #ifdef H5_HAVE_PARALLEL
-    if H5F_HAS_FEATURE(dataset->oloc.file, H5FD_FEAT_HAS_MPI) {
-        /* If MPI based VFD is used, no VL datatype support yet. */
-        /* This is because they use the global heap in the file and we don't */
-        /* support parallel access of that yet */
-        if(H5T_detect_class(type_info.mem_type, H5T_VLEN, FALSE) > 0)
-            HGOTO_ERROR(H5E_DATASET, H5E_UNSUPPORTED, FAIL, "Parallel IO does not support writing VL datatypes yet")
-
-        /* If MPI based VFD is used, no VL datatype support yet. */
+    if(H5F_HAS_FEATURE(dataset->oloc.file, H5FD_FEAT_HAS_MPI)) {
+        /* If MPI based VFD is used, no VL or region reference datatype support yet. */
         /* This is because they use the global heap in the file and we don't */
         /* support parallel access of that yet */
-        /* We should really use H5T_detect_class() here, but it will be difficult
-         * to detect the type of the reference if it is nested... -QAK
-         */
-        if(H5T_get_class(type_info.mem_type, TRUE) == H5T_REFERENCE &&
-                H5T_get_ref_type(type_info.mem_type) == H5R_DATASET_REGION)
-            HGOTO_ERROR(H5E_DATASET, H5E_UNSUPPORTED, FAIL, "Parallel IO does not support writing region reference datatypes yet")
+        if(H5T_is_vl_storage(type_info.mem_type) > 0)
+            HGOTO_ERROR(H5E_DATASET, H5E_UNSUPPORTED, FAIL, "Parallel IO does not support writing VL or region reference datatypes yet")
     } /* end if */
     else {
         H5FD_mpio_xfer_t io_xfer_mode;      /* MPI I/O transfer mode */
@@ -1151,15 +1143,19 @@ H5D__ioinfo_adjust(H5D_io_info_t *io_info, const H5D_t *dset,
                 hbool_t                         local_error_message_previously_written = FALSE;
                 hbool_t                         global_error_message_previously_written = FALSE;
                 size_t                          index;
-                char                            local_no_collective_cause_string[256] = "";
-                char                            global_no_collective_cause_string[256] = "";
+                size_t                          cause_strings_len;
+                char                            local_no_collective_cause_string[512] = "";
+                char                            global_no_collective_cause_string[512] = "";
                 const char                     *cause_strings[] = { "independent I/O was requested",
                                                                     "datatype conversions were required",
                                                                     "data transforms needed to be applied",
                                                                     "optimized MPI types flag wasn't set",
                                                                     "one of the dataspaces was neither simple nor scalar",
                                                                     "dataset was not contiguous or chunked",
-                                                                    "parallel writes to filtered datasets are disabled" };
+                                                                    "parallel writes to filtered datasets are disabled",
+                                                                    "an error occurred while checking if collective I/O was possible" };
+
+                cause_strings_len = sizeof(cause_strings) / sizeof(cause_strings[0]);
 
                 if(H5CX_get_mpio_local_no_coll_cause(&local_no_collective_cause) < 0)
                     HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "unable to get local no collective cause value")
@@ -1168,7 +1164,7 @@ H5D__ioinfo_adjust(H5D_io_info_t *io_info, const H5D_t *dset,
 
                 /* Append each of the "reason for breaking collective I/O" error messages to the
                  * local and global no collective cause strings */
-                for (cause = 1, index = 0; cause < H5D_MPIO_NO_COLLECTIVE_MAX_CAUSE; cause <<= 1, index++) {
+                for (cause = 1, index = 0; (cause < H5D_MPIO_NO_COLLECTIVE_MAX_CAUSE) && (index < cause_strings_len); cause <<= 1, index++) {
                     size_t cause_strlen = HDstrlen(cause_strings[index]);
 
                     if (cause & local_no_collective_cause) {
diff --git a/src/H5Dmpio.c b/src/H5Dmpio.c
index 2c06800..f5da33d 100644
--- a/src/H5Dmpio.c
+++ b/src/H5Dmpio.c
@@ -37,7 +37,6 @@
 #include "H5Eprivate.h"       /* Error handling    */
 #include "H5Fprivate.h"       /* File access       */
 #include "H5FDprivate.h"      /* File drivers      */
-#include "H5FDmpi.h"          /* MPI-based file drivers	*/
 #include "H5Iprivate.h"       /* IDs               */
 #include "H5MMprivate.h"      /* Memory management */
 #include "H5Oprivate.h"       /* Object headers    */
@@ -89,10 +88,20 @@
 /******************/
 /* Combine chunk address and chunk info into a struct for better performance. */
 typedef struct H5D_chunk_addr_info_t {
-  haddr_t chunk_addr;
-  H5D_chunk_info_t chunk_info;
+    haddr_t chunk_addr;
+    H5D_chunk_info_t chunk_info;
 } H5D_chunk_addr_info_t;
 
+/* Rank 0 Bcast values */
+typedef enum H5D_mpio_no_rank0_bcast_cause_t {
+    H5D_MPIO_RANK0_BCAST = 0x00,
+    H5D_MPIO_RANK0_NOT_H5S_ALL = 0x01,
+    H5D_MPIO_RANK0_NOT_CONTIGUOUS = 0x02,
+    H5D_MPIO_RANK0_NOT_FIXED_SIZE = 0x04,
+    H5D_MPIO_RANK0_GREATER_THAN_2GB = 0x08
+} H5D_mpio_no_rank0_bcast_cause_t;
+
+
 /*
  * Information about a single chunk when performing collective filtered I/O. All
  * of the fields of one of these structs are initialized at the start of collective
@@ -281,8 +290,10 @@ H5D__mpio_opt_possible(const H5D_io_info_t *io_info, const H5S_t *file_space,
     const H5S_t *mem_space, const H5D_type_info_t *type_info)
 {
     H5FD_mpio_xfer_t io_xfer_mode;      /* MPI I/O transfer mode */
-    unsigned local_cause = 0;                /* Local reason(s) for breaking collective mode */
-    unsigned global_cause = 0;               /* Global reason(s) for breaking collective mode */
+    unsigned local_cause[2] = {0,0};    /* [0] Local reason(s) for breaking collective mode */
+                                        /* [1] Flag if dataset is both: H5S_ALL and small */
+    unsigned global_cause[2] = {0,0};   /* Global reason(s) for breaking collective mode */
+    htri_t is_vl_storage;               /* Whether the dataset's datatype is stored in a variable-length form */
     htri_t ret_value = SUCCEED;         /* Return value */
 
     FUNC_ENTER_PACKAGE
@@ -296,36 +307,37 @@ H5D__mpio_opt_possible(const H5D_io_info_t *io_info, const H5S_t *file_space,
 
     /* For independent I/O, get out quickly and don't try to form consensus */
     if(H5CX_get_io_xfer_mode(&io_xfer_mode) < 0)
-        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get MPI-I/O transfer mode")
+        /* Set error flag, but keep going */
+        local_cause[0] |= H5D_MPIO_ERROR_WHILE_CHECKING_COLLECTIVE_POSSIBLE;
     if(io_xfer_mode == H5FD_MPIO_INDEPENDENT)
-        local_cause |= H5D_MPIO_SET_INDEPENDENT;
+        local_cause[0] |= H5D_MPIO_SET_INDEPENDENT;
 
     /* Optimized MPI types flag must be set */
     /* (based on 'HDF5_MPI_OPT_TYPES' environment variable) */
     if(!H5FD_mpi_opt_types_g)
-        local_cause |= H5D_MPIO_MPI_OPT_TYPES_ENV_VAR_DISABLED;
+        local_cause[0] |= H5D_MPIO_MPI_OPT_TYPES_ENV_VAR_DISABLED;
 
     /* Don't allow collective operations if datatype conversions need to happen */
     if(!type_info->is_conv_noop)
-        local_cause |= H5D_MPIO_DATATYPE_CONVERSION;
+        local_cause[0] |= H5D_MPIO_DATATYPE_CONVERSION;
 
     /* Don't allow collective operations if data transform operations should occur */
     if(!type_info->is_xform_noop)
-        local_cause |= H5D_MPIO_DATA_TRANSFORMS;
+        local_cause[0] |= H5D_MPIO_DATA_TRANSFORMS;
 
     /* Check whether these are both simple or scalar dataspaces */
     if(!((H5S_SIMPLE == H5S_GET_EXTENT_TYPE(mem_space) || H5S_SCALAR == H5S_GET_EXTENT_TYPE(mem_space))
             && (H5S_SIMPLE == H5S_GET_EXTENT_TYPE(file_space) || H5S_SCALAR == H5S_GET_EXTENT_TYPE(file_space))))
-        local_cause |= H5D_MPIO_NOT_SIMPLE_OR_SCALAR_DATASPACES;
+        local_cause[0] |= H5D_MPIO_NOT_SIMPLE_OR_SCALAR_DATASPACES;
 
     /* Dataset storage must be contiguous or chunked */
     if(!(io_info->dset->shared->layout.type == H5D_CONTIGUOUS ||
             io_info->dset->shared->layout.type == H5D_CHUNKED))
-        local_cause |= H5D_MPIO_NOT_CONTIGUOUS_OR_CHUNKED_DATASET;
+        local_cause[0] |= H5D_MPIO_NOT_CONTIGUOUS_OR_CHUNKED_DATASET;
 
     /* check if external-file storage is used */
     if(io_info->dset->shared->dcpl_cache.efl.nused > 0)
-        local_cause |= H5D_MPIO_NOT_CONTIGUOUS_OR_CHUNKED_DATASET;
+        local_cause[0] |= H5D_MPIO_NOT_CONTIGUOUS_OR_CHUNKED_DATASET;
 
     /* The handling of memory space is different for chunking and contiguous
      *  storage.  For contiguous storage, mem_space and file_space won't change
@@ -340,31 +352,84 @@ H5D__mpio_opt_possible(const H5D_io_info_t *io_info, const H5S_t *file_space,
      * is less than 3. The functions needed (MPI_Mprobe and MPI_Imrecv) will
      * not be available.
      */
-    if (io_info->op_type == H5D_IO_OP_WRITE &&
-        io_info->dset->shared->layout.type == H5D_CHUNKED &&
-        io_info->dset->shared->dcpl_cache.pline.nused > 0)
-        local_cause |= H5D_MPIO_PARALLEL_FILTERED_WRITES_DISABLED;
+    if(io_info->op_type == H5D_IO_OP_WRITE &&
+            io_info->dset->shared->layout.type == H5D_CHUNKED &&
+            io_info->dset->shared->dcpl_cache.pline.nused > 0)
+        local_cause[0] |= H5D_MPIO_PARALLEL_FILTERED_WRITES_DISABLED;
 #endif
 
+    /* Check if we are able to do a MPI_Bcast of the data from one rank
+     * instead of having all the processes involved in the collective I/O call.
+     */
+
+    /* Check to see if the process is reading the entire dataset */
+    if(H5S_GET_SELECT_TYPE(file_space) != H5S_SEL_ALL)
+        local_cause[1] |= H5D_MPIO_RANK0_NOT_H5S_ALL; 
+    /* Only perform this optimization for contigous datasets, currently */
+    else if(H5D_CONTIGUOUS != io_info->dset->shared->layout.type)
+        /* Flag to do a MPI_Bcast of the data from one proc instead of 
+         * having all the processes involved in the collective I/O.
+         */
+        local_cause[1] |= H5D_MPIO_RANK0_NOT_CONTIGUOUS; 
+    else if((is_vl_storage = H5T_is_vl_storage(type_info->dset_type)) < 0)
+        local_cause[0] |= H5D_MPIO_ERROR_WHILE_CHECKING_COLLECTIVE_POSSIBLE;
+    else if(is_vl_storage)
+        local_cause[1] |= H5D_MPIO_RANK0_NOT_FIXED_SIZE;
+    else {
+        size_t type_size;       /* Size of dataset's datatype */
+
+        /* Retrieve the size of the dataset's datatype */
+        if(0 == (type_size = H5T_GET_SIZE(type_info->dset_type)))
+            local_cause[0] |= H5D_MPIO_ERROR_WHILE_CHECKING_COLLECTIVE_POSSIBLE;
+        else {
+            hssize_t snelmts;   /* [Signed] # of elements in dataset's dataspace */
+
+            /* Retrieve the size of the dataset's datatype */
+            if((snelmts = H5S_GET_EXTENT_NPOINTS(file_space)) < 0)
+                local_cause[0] |= H5D_MPIO_ERROR_WHILE_CHECKING_COLLECTIVE_POSSIBLE;
+            else {
+                hsize_t dset_size;
+
+                /* Determine dataset size */
+                dset_size = ((hsize_t)snelmts) * type_size;
+
+               /* If the size of the dataset is less than 2GB then do an MPI_Bcast
+                * of the data from one process instead of having all the processes 
+                * involved in the collective I/O.
+                */
+                if(dset_size > ((hsize_t)(2.0F * H5_GB) - 1))
+                    local_cause[1] |= H5D_MPIO_RANK0_GREATER_THAN_2GB;
+            } /* end else */
+        } /* end else */
+    } /* end else */
+    
     /* Check for independent I/O */
-    if(local_cause & H5D_MPIO_SET_INDEPENDENT)
-        global_cause = local_cause;
+    if(local_cause[0] & H5D_MPIO_SET_INDEPENDENT)
+        global_cause[0] = local_cause[0];
     else {
         int mpi_code;               /* MPI error code */
 
         /* Form consensus opinion among all processes about whether to perform
          * collective I/O
          */
-        if(MPI_SUCCESS != (mpi_code = MPI_Allreduce(&local_cause, &global_cause, 1, MPI_UNSIGNED, MPI_BOR, io_info->comm)))
+        if(MPI_SUCCESS != (mpi_code = MPI_Allreduce(&local_cause, &global_cause, 2, MPI_UNSIGNED, MPI_BOR, io_info->comm)))
             HMPI_GOTO_ERROR(FAIL, "MPI_Allreduce failed", mpi_code)
     } /* end else */
 
     /* Set the local & global values of no-collective-cause in the API context */
-    H5CX_set_mpio_local_no_coll_cause(local_cause);
-    H5CX_set_mpio_global_no_coll_cause(global_cause);
+    H5CX_set_mpio_local_no_coll_cause(local_cause[0]);
+    H5CX_set_mpio_global_no_coll_cause(global_cause[0]);
+
+    /* Set read-with-rank0-and-bcast flag if possible */
+    if(global_cause[0] == 0 && global_cause[1] == 0) {
+        H5CX_set_mpio_rank0_bcast(TRUE);
+#ifdef H5_HAVE_INSTRUMENTED_LIBRARY
+        H5CX_test_set_mpio_coll_rank0_bcast(TRUE);
+#endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
+    } /* end if */
 
     /* Set the return value, based on the global cause */
-    ret_value = global_cause > 0 ? FALSE : TRUE;
+    ret_value = global_cause[0] > 0 ? FALSE : TRUE;
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
@@ -3069,8 +3134,8 @@ H5D__filtered_collective_chunk_entry_io(H5D_filtered_collective_io_info_t *chunk
         chunk_entry->chunk_states.new_chunk.length = chunk_entry->chunk_states.chunk_current.length;
 
         /* Currently, these chunk reads are done independently and will likely
-	 * cause issues with collective metadata reads enabled. In the future,
-	 * this should be refactored to use collective chunk reads - JTH */
+         * cause issues with collective metadata reads enabled. In the future,
+         * this should be refactored to use collective chunk reads - JTH */
 
         /* Get the original state of parallel I/O transfer mode */
         if(H5CX_get_io_xfer_mode(&xfer_mode) < 0)
diff --git a/src/H5Dpkg.h b/src/H5Dpkg.h
index 30652a5..2767aa1 100644
--- a/src/H5Dpkg.h
+++ b/src/H5Dpkg.h
@@ -110,15 +110,6 @@ typedef struct H5D_type_info_t {
     hbool_t  bkg_buf_allocated;          /* Whether the background buffer was allocated */
 } H5D_type_info_t;
 
-/* Types for dataset optional VOL operations */
-typedef enum H5VL_dataset_optional_t {
-    H5VL_DATASET_FORMAT_CONVERT,            /* H5Dformat_convert (internal) */
-    H5VL_DATASET_GET_CHUNK_INDEX_TYPE,      /* H5Dget_chunk_index_type      */
-    H5VL_DATASET_GET_CHUNK_STORAGE_SIZE,    /* H5Dget_chunk_storage_size    */
-    H5VL_DATASET_CHUNK_READ,                /* H5Dchunk_read                */
-    H5VL_DATASET_CHUNK_WRITE,               /* H5Dchunk_write               */
-} H5VL_dataset_optional_t;
-
 /* Forward declaration of structs used below */
 struct H5D_io_info_t;
 struct H5D_chunk_map_t;
diff --git a/src/H5Dprivate.h b/src/H5Dprivate.h
index 4e9cda8..6fb7889 100644
--- a/src/H5Dprivate.h
+++ b/src/H5Dprivate.h
@@ -45,6 +45,7 @@
 #define H5D_CRT_FILL_VALUE_NAME    "fill_value"          /* Fill value */
 #define H5D_CRT_ALLOC_TIME_STATE_NAME "alloc_time_state" /* Space allocation time state */
 #define H5D_CRT_EXT_FILE_LIST_NAME "efl"                 /* External file list */
+#define H5D_CRT_MIN_DSET_HDR_SIZE_NAME "dset_oh_minimize"/* Minimize object header */
 
 /* ========  Dataset access property names ======== */
 #define H5D_ACS_DATA_CACHE_NUM_SLOTS_NAME   "rdcc_nslots"    /* Size of raw data chunk cache(slots) */
@@ -94,7 +95,13 @@
 /* Definitions for all collective chunk instrumentation properties */
 #define H5D_XFER_COLL_CHUNK_SIZE        sizeof(unsigned)
 #define H5D_XFER_COLL_CHUNK_DEF         1
-#define H5D_XFER_COLL_CHUNK_FIX         0
+
+/* General collective I/O instrumentation properties */
+#define H5D_XFER_COLL_RANK0_BCAST_NAME  "coll_rank0_bcast"
+
+/* Definitions for general collective I/O instrumentation properties */
+#define H5D_XFER_COLL_RANK0_BCAST_SIZE  sizeof(hbool_t)
+#define H5D_XFER_COLL_RANK0_BCAST_DEF   FALSE
 #endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
 
 /* Default temporary buffer size */
diff --git a/src/H5Dpublic.h b/src/H5Dpublic.h
index a1ccda0..63f1a24 100644
--- a/src/H5Dpublic.h
+++ b/src/H5Dpublic.h
@@ -104,17 +104,6 @@ typedef enum H5D_vds_view_t {
 /* Callback for H5Pset_append_flush() in a dataset access property list */
 typedef herr_t (*H5D_append_cb_t)(hid_t dataset_id, hsize_t *cur_dims, void *op_data);
 
-/********************/
-/* Public Variables */
-/********************/
-
-/*********************/
-/* Public Prototypes */
-/*********************/
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /* Define the operator function pointer for H5Diterate() */
 typedef herr_t (*H5D_operator_t)(void *elem, hid_t type_id, unsigned ndim,
 				 const hsize_t *point, void *operator_data);
@@ -128,6 +117,18 @@ typedef herr_t (*H5D_scatter_func_t)(const void **src_buf/*out*/,
 typedef herr_t (*H5D_gather_func_t)(const void *dst_buf,
                                     size_t dst_buf_bytes_used, void *op_data);
 
+
+/********************/
+/* Public Variables */
+/********************/
+
+/*********************/
+/* Public Prototypes */
+/*********************/
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 H5_DLL hid_t H5Dcreate2(hid_t loc_id, const char *name, hid_t type_id,
     hid_t space_id, hid_t lcpl_id, hid_t dcpl_id, hid_t dapl_id);
 H5_DLL hid_t H5Dcreate_anon(hid_t file_id, hid_t type_id, hid_t space_id,
diff --git a/src/H5F.c b/src/H5F.c
index a5017d8..9df8140 100644
--- a/src/H5F.c
+++ b/src/H5F.c
@@ -38,6 +38,8 @@
 #include "H5Tprivate.h"         /* Datatypes                                */
 #include "H5VLprivate.h"        /* Virtual Object Layer                     */
 
+#include "H5VLnative_private.h" /* Native VOL connector                     */
+
 
 /****************/
 /* Local Macros */
@@ -545,7 +547,7 @@ H5Fget_vfd_handle(hid_t file_id, hid_t fapl_id, void **file_handle)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid file identifier")
 
     /* Retrieve the VFD handle for the file */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_GET_VFD_HANDLE, file_handle, fapl_id) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_VFD_HANDLE, file_handle, fapl_id) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to get VFD handle")
 
 done:
@@ -651,11 +653,17 @@ H5Fcreate(const char *filename, unsigned flags, hid_t fcpl_id, hid_t fapl_id)
     if(H5CX_set_apl(&fapl_id, H5P_CLS_FACC, H5I_INVALID_HID, TRUE) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTSET, H5I_INVALID_HID, "can't set access property list info")
 
-    /* get the VOL info from the fapl */
+    /* Get the VOL info from the fapl */
     if(NULL == (plist = (H5P_genplist_t *)H5I_object(fapl_id)))
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, H5I_INVALID_HID, "not a file access property list")
     if(H5P_peek(plist, H5F_ACS_VOL_CONN_NAME, &connector_prop) < 0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, H5I_INVALID_HID, "can't get VOL connector info")
+        HGOTO_ERROR(H5E_FILE, H5E_CANTGET, H5I_INVALID_HID, "can't get VOL connector info")
+
+    /* Stash a copy of the "top-level" connector property, before any pass-through
+     *  connectors modify or unwrap it.
+     */
+    if(H5CX_set_vol_connector_prop(&connector_prop) < 0)
+        HGOTO_ERROR(H5E_FILE, H5E_CANTSET, H5I_INVALID_HID, "can't set VOL connector info in API context")
 
     /* Adjust bit flags by turning on the creation bit and making sure that
      * the EXCL or TRUNC bit is set.  All newly-created files are opened for
@@ -731,7 +739,13 @@ H5Fopen(const char *filename, unsigned flags, hid_t fapl_id)
     if(NULL == (plist = (H5P_genplist_t *)H5I_object(fapl_id)))
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, H5I_INVALID_HID, "not a file access property list")
     if(H5P_peek(plist, H5F_ACS_VOL_CONN_NAME, &connector_prop) < 0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, H5I_INVALID_HID, "can't get VOL connector info")
+        HGOTO_ERROR(H5E_FILE, H5E_CANTGET, H5I_INVALID_HID, "can't get VOL connector info")
+
+    /* Stash a copy of the "top-level" connector property, before any pass-through
+     *  connectors modify or unwrap it.
+     */
+    if(H5CX_set_vol_connector_prop(&connector_prop) < 0)
+        HGOTO_ERROR(H5E_FILE, H5E_CANTSET, H5I_INVALID_HID, "can't set VOL connector info in API context")
 
     /* Open the file through the VOL layer */
     if(NULL == (new_file = (H5F_t *)H5VL_file_open(&connector_prop, filename, flags, fapl_id, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL)))
@@ -778,7 +792,7 @@ H5Fflush(hid_t object_id, H5F_scope_t scope)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid object identifier")
 
     /* Flush the object */
-    if(H5VL_file_specific(vol_obj, H5VL_FILE_FLUSH, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, obj_type, scope) < 0)
+    if(H5VL_file_specific(vol_obj, H5VL_FILE_FLUSH, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, (int)obj_type, (int)scope) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTFLUSH, FAIL, "unable to flush file")
 
 done:
@@ -931,7 +945,7 @@ H5Fget_freespace(hid_t file_id)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, (-1), "invalid file identifier")
 
     /* Get the amount of free space in the file */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_GET_FREE_SPACE, &ret_value) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_FREE_SPACE, &ret_value) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTGET, (-1), "unable to get file free space")
 
 done:
@@ -966,7 +980,7 @@ H5Fget_filesize(hid_t file_id, hsize_t *size)
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "not a file ID")
 
     /* Get the file size */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_GET_SIZE, size) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_SIZE, size) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to get file size")
 
 done:
@@ -1027,7 +1041,7 @@ H5Fget_file_image(hid_t file_id, void *buf_ptr, size_t buf_len)
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, (-1), "not a file ID")
 
     /* Get the file image */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_GET_FILE_IMAGE, buf_ptr, &ret_value, buf_len) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_FILE_IMAGE, buf_ptr, &ret_value, buf_len) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTGET, (-1), "unable to get file image")
 
 done:
@@ -1067,7 +1081,7 @@ H5Fget_mdc_config(hid_t file_id, H5AC_cache_config_t *config_ptr)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid file identifier")
 
     /* Get the metadata cache configuration */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_GET_MDC_CONF, config_ptr) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_MDC_CONF, config_ptr) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to get metadata cache configuration")
 
 done:
@@ -1100,7 +1114,7 @@ H5Fset_mdc_config(hid_t file_id, H5AC_cache_config_t *config_ptr)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid file identifier")
 
     /* Set the metadata cache configuration  */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_SET_MDC_CONFIG, config_ptr) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_SET_MDC_CONFIG, config_ptr) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "unable to set metadata cache configuration")
 
 done:
@@ -1136,7 +1150,7 @@ H5Fget_mdc_hit_rate(hid_t file_id, double *hit_rate_ptr)
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "not a file ID")
 
     /* Get the current hit rate */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_GET_MDC_HR, hit_rate_ptr) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_MDC_HR, hit_rate_ptr) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to get MDC hit rate")
 
 done:
@@ -1173,7 +1187,7 @@ H5Fget_mdc_size(hid_t file_id, size_t *max_size_ptr, size_t *min_clean_size_ptr,
          HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "not a file ID")
 
     /* Get the size data */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_GET_MDC_SIZE, max_size_ptr, min_clean_size_ptr, cur_size_ptr, cur_num_entries_ptr) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_MDC_SIZE, max_size_ptr, min_clean_size_ptr, cur_size_ptr, cur_num_entries_ptr) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to get MDC size")
 
 done:
@@ -1211,7 +1225,7 @@ H5Freset_mdc_hit_rate_stats(hid_t file_id)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid file identifier")
 
     /* Reset the hit rate statistic */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_RESET_MDC_HIT_RATE) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_RESET_MDC_HIT_RATE) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "can't reset cache hit rate")
 
 done:
@@ -1260,7 +1274,7 @@ H5Fget_name(hid_t obj_id, char *name/*out*/, size_t size)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, (-1), "invalid file identifier")
 
     /* Get the filename via the VOL */
-    if(H5VL_file_get(vol_obj, H5VL_FILE_GET_NAME, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, type, size, name, &ret_value) < 0)
+    if(H5VL_file_get(vol_obj, H5VL_FILE_GET_NAME, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, (int)type, size, name, &ret_value) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTGET, (-1), "unable to get file name")
 
 done:
@@ -1305,7 +1319,7 @@ H5Fget_info2(hid_t obj_id, H5F_info2_t *finfo)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid object identifier")
 
     /* Get the file information */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_GET_INFO, type, finfo) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_INFO, (int)type, finfo) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to retrieve file info")
 
 done:
@@ -1333,7 +1347,7 @@ H5Fget_metadata_read_retry_info(hid_t file_id, H5F_retry_info_t *info)
     H5TRACE2("e", "i*x", file_id, info);
 
     /* Check args */
-    if (!info)
+    if(!info)
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no info struct")
 
     /* Get the file pointer */
@@ -1341,7 +1355,7 @@ H5Fget_metadata_read_retry_info(hid_t file_id, H5F_retry_info_t *info)
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "not a file ID")
 
     /* Get the retry info */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_GET_METADATA_READ_RETRY_INFO, info) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_METADATA_READ_RETRY_INFO, info) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTRELEASE, FAIL, "can't get metadata read retry info")
 
 done:
@@ -1380,7 +1394,7 @@ H5Fget_free_sections(hid_t file_id, H5F_mem_t type, size_t nsects,
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, (-1), "nsects must be > 0")
 
     /* Get the free-space section information in the file */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_GET_FREE_SECTIONS, sect_info, &ret_value, type, nsects) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_FREE_SECTIONS, sect_info, &ret_value, (int)type, nsects) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTGET, (-1), "unable to get file free sections")
 
 done:
@@ -1413,7 +1427,7 @@ H5Fclear_elink_file_cache(hid_t file_id)
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "not a file ID")
 
     /* Release the EFC */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_CLEAR_ELINK_CACHE) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_CLEAR_ELINK_CACHE) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTRELEASE, FAIL, "can't release external file cache")
 
 done:
@@ -1473,7 +1487,7 @@ H5Fstart_swmr_write(hid_t file_id)
         HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "can't set collective metadata read info")
 
     /* Start SWMR writing */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_START_SWMR_WRITE) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_START_SWMR_WRITE) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_SYSTEM, FAIL, "unable to start SWMR writing")
 
 done:
@@ -1505,8 +1519,8 @@ H5Fstart_mdc_logging(hid_t file_id)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "hid_t identifier is not a file ID")
 
     /* Call mdc logging function */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_START_MDC_LOGGING) < 0)
-        HGOTO_ERROR(H5E_FILE, H5E_LOGFAIL, FAIL, "unable to start mdc logging")
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_START_MDC_LOGGING) < 0)
+        HGOTO_ERROR(H5E_FILE, H5E_LOGGING, FAIL, "unable to start mdc logging")
 
 done:
     FUNC_LEAVE_API(ret_value)
@@ -1538,8 +1552,8 @@ H5Fstop_mdc_logging(hid_t file_id)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "hid_t identifier is not a file ID")
 
     /* Call mdc logging function */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_STOP_MDC_LOGGING) < 0)
-        HGOTO_ERROR(H5E_FILE, H5E_LOGFAIL, FAIL, "unable to stop mdc logging")
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_STOP_MDC_LOGGING) < 0)
+        HGOTO_ERROR(H5E_FILE, H5E_LOGGING, FAIL, "unable to stop mdc logging")
 
 done:
     FUNC_LEAVE_API(ret_value)
@@ -1572,8 +1586,8 @@ H5Fget_mdc_logging_status(hid_t file_id, hbool_t *is_enabled,
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "hid_t identifier is not a file ID")
 
     /* Call mdc logging function */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_GET_MDC_LOGGING_STATUS, is_enabled, is_currently_logging) < 0)
-        HGOTO_ERROR(H5E_FILE, H5E_LOGFAIL, FAIL, "unable to get logging status")
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_MDC_LOGGING_STATUS, is_enabled, is_currently_logging) < 0)
+        HGOTO_ERROR(H5E_FILE, H5E_LOGGING, FAIL, "unable to get logging status")
 
 done:
     FUNC_LEAVE_API(ret_value)
@@ -1610,7 +1624,7 @@ H5Fset_libver_bounds(hid_t file_id, H5F_libver_t low, H5F_libver_t high)
         HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "can't set collective metadata read info")
 
     /* Set the library's version bounds */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_SET_LIBVER_BOUNDS, low, high) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_SET_LIBVER_BOUNDS, low, high) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "can't set library version bounds")
 
 done:
@@ -1647,7 +1661,7 @@ H5Fformat_convert(hid_t file_id)
         HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "can't set collective metadata read info")
 
     /* Convert the format */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_FORMAT_CONVERT) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_FORMAT_CONVERT) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTCONVERT, FAIL, "can't convert file format")
 
 done:
@@ -1678,7 +1692,7 @@ H5Freset_page_buffering_stats(hid_t file_id)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid file identifier")
 
     /* Reset the statistics */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_RESET_PAGE_BUFFERING_STATS) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_RESET_PAGE_BUFFERING_STATS) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "can't reset stats for page buffering")
 
 done:
@@ -1713,7 +1727,7 @@ H5Fget_page_buffering_stats(hid_t file_id, unsigned accesses[2], unsigned hits[2
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "NULL input parameters for stats")
 
     /* Get the statistics */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_GET_PAGE_BUFFERING_STATS, accesses, hits, misses, evictions, bypasses) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_PAGE_BUFFERING_STATS, accesses, hits, misses, evictions, bypasses) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't retrieve stats for page buffering")
 
 done:
@@ -1748,7 +1762,7 @@ H5Fget_mdc_image_info(hid_t file_id, haddr_t *image_addr, hsize_t *image_len)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "hid_t identifier is not a file ID")
 
     /* Go get the address and size of the cache image */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_GET_MDC_IMAGE_INFO, image_addr, image_len) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_MDC_IMAGE_INFO, image_addr, image_len) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't retrieve cache image info")
 
 done:
@@ -1782,7 +1796,7 @@ H5Fget_eoa(hid_t file_id, haddr_t *eoa)
     /* Only do work if valid pointer to fill in */
     if(eoa) {
         /* Retrieve the EOA for the file */
-        if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_GET_EOA, eoa) < 0)
+        if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_EOA, eoa) < 0)
             HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to get EOA")
     } /* end if */
 
@@ -1813,10 +1827,96 @@ H5Fincrement_filesize(hid_t file_id, hsize_t increment)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "hid_t identifier is not a file ID")
 
     /* Increment the file size */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_INCR_FILESIZE, increment) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_INCR_FILESIZE, increment) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "unable to increment file size")
 
 done:
     FUNC_LEAVE_API(ret_value)
 } /* H5Fincrement_filesize() */
 
+
+/*-------------------------------------------------------------------------
+ * Function: H5Fget_dset_no_attrs_hint
+ *
+ * Purpose:
+ *
+ *     Get the file-level setting to create minimized dataset object headers.
+ *     Result is stored at pointer `minimize`.
+ *
+ * Return:
+ *
+ *     Success: SUCCEED (0) (non-negative value)
+ *     Failure: FAIL (-1) (negative value)
+ *
+ * Programmer:
+ *
+ *     Jacob Smith
+ *     15 August 2018
+ *
+ * Changes: None.
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5Fget_dset_no_attrs_hint(hid_t file_id, hbool_t *minimize)
+{
+    H5VL_object_t  *vol_obj   = NULL;
+    herr_t          ret_value = SUCCEED;
+
+    FUNC_ENTER_API(FAIL)
+    H5TRACE2("e", "i*b", file_id, minimize);
+
+    if(NULL == minimize)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "out pointer 'minimize' cannot be NULL")
+
+    vol_obj = (H5VL_object_t *)H5I_object_verify(file_id, H5I_FILE);
+    if(NULL == vol_obj)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid file identifier")
+
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_MIN_DSET_OHDR_FLAG, minimize) < 0)
+        HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "unable to set file's dataset header minimization flag")
+
+done:
+    FUNC_LEAVE_API(ret_value)
+} /* H5Fget_dset_no_attrs_hint */
+
+
+/*-------------------------------------------------------------------------
+ * Function: H5Fset_dset_no_attrs_hint
+ *
+ * Purpose:
+ *
+ *     Set the file-level setting to create minimized dataset object headers.
+ *
+ * Return:
+ *
+ *     Success: SUCCEED (0) (non-negative value)
+ *     Failure: FAIL (-1) (negative value)
+ *
+ * Programmer:
+ *
+ *     Jacob Smith
+ *     15 August 2018
+ *
+ * Changes: None.
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5Fset_dset_no_attrs_hint(hid_t file_id, hbool_t minimize)
+{
+    H5VL_object_t *vol_obj   = NULL;
+    herr_t         ret_value = SUCCEED;
+
+    FUNC_ENTER_API(FAIL)
+    H5TRACE2("e", "ib", file_id, minimize);
+
+    vol_obj = (H5VL_object_t *)H5I_object_verify(file_id, H5I_FILE);
+    if(NULL == vol_obj)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid file identifier")
+
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_SET_MIN_DSET_OHDR_FLAG, minimize) < 0)
+        HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "unable to set file's dataset header minimization flag")
+
+done:
+    FUNC_LEAVE_API(ret_value)
+} /* H5Fset_dset_no_attrs_hint */
+
diff --git a/src/H5FDcore.c b/src/H5FDcore.c
index 2ab04dc..ed05e95 100644
--- a/src/H5FDcore.c
+++ b/src/H5FDcore.c
@@ -54,6 +54,7 @@ typedef struct H5FD_core_t {
     haddr_t eof;                /* current allocated size               */
     size_t  increment;          /* multiples for mem allocation         */
     hbool_t backing_store;      /* write to file name on flush          */
+    hbool_t write_tracking;     /* Whether to track writes              */
     size_t  bstore_page_size;   /* backing store page size              */
     int     fd;                 /* backing store file descriptor        */
     /* Information for determining uniqueness of a file with a backing store */
@@ -93,10 +94,14 @@ typedef struct H5FD_core_t {
 typedef struct H5FD_core_fapl_t {
     size_t  increment;          /* how much to grow memory */
     hbool_t backing_store;      /* write to file name on flush */
+    hbool_t write_tracking;     /* Whether to track writes */
+    size_t page_size;           /* Page size for tracked writes */
 } H5FD_core_fapl_t;
 
 /* Allocate memory in multiples of this size by default */
-#define H5FD_CORE_INCREMENT 8192
+#define H5FD_CORE_INCREMENT                     8192
+#define H5FD_CORE_WRITE_TRACKING_FLAG           FALSE
+#define H5FD_CORE_WRITE_TRACKING_PAGE_SIZE      524288
 
 /* These macros check for overflow of various quantities.  These macros
  * assume that file_offset_t is signed and haddr_t and size_t are unsigned.
@@ -415,8 +420,8 @@ done:
  * Purpose:     Initialize this driver by registering the driver with the
  *              library.
  *
- * Return:      Success:    The driver ID for the core driver.
- *              Failure:    Negative.
+ * Return:      Success:    The driver ID for the core driver
+ *              Failure:    H5I_INVALID_HID
  *
  * Programmer:  Robb Matzke
  *              Thursday, July 29, 1999
@@ -428,7 +433,7 @@ H5FD_core_init(void)
 {
     hid_t ret_value = H5I_INVALID_HID;  /* Return value */
 
-    FUNC_ENTER_NOAPI(FAIL)
+    FUNC_ENTER_NOAPI(H5I_INVALID_HID)
 
     if(H5I_VFL != H5I_get_type(H5FD_CORE_g))
         H5FD_CORE_g = H5FD_register(&H5FD_core_g, sizeof(H5FD_class_t), FALSE);
@@ -466,6 +471,100 @@ H5FD__core_term(void)
 
 
 /*-------------------------------------------------------------------------
+ * Function:    H5Pset_core_write_tracking
+ *
+ * Purpose:    Enables/disables core VFD write tracking and page
+ *              aggregation size.
+ *
+ * Return:    Non-negative on success/Negative on failure
+ *
+ * Programmer:  Dana Robinson
+ *              Tuesday, April 8, 2014
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5Pset_core_write_tracking(hid_t plist_id, hbool_t is_enabled, size_t page_size)
+{
+    H5P_genplist_t *plist;              /* Property list pointer */
+    H5FD_core_fapl_t fa;                /* Core VFD info */
+    const H5FD_core_fapl_t *old_fa;     /* Old core VFD info */
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_API(FAIL)
+    H5TRACE3("e", "ibz", plist_id, is_enabled, page_size);
+
+    /* The page size cannot be zero */
+    if(page_size == 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "page_size cannot be zero")
+
+    /* Get the plist structure */
+    if(NULL == (plist = H5P_object_verify(plist_id, H5P_FILE_ACCESS)))
+        HGOTO_ERROR(H5E_PLIST, H5E_BADATOM, FAIL, "can't find object for ID")
+    if(H5FD_CORE != H5P_peek_driver(plist))
+        HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "incorrect VFL driver")
+    if(NULL == (old_fa = (const H5FD_core_fapl_t *)H5P_peek_driver_info(plist)))
+        HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "bad VFL driver info")
+
+    /* Set VFD info values */
+    HDmemset(&fa, 0, sizeof(H5FD_core_fapl_t));
+    fa.increment = old_fa->increment;
+    fa.backing_store = old_fa->backing_store;
+    fa.write_tracking = is_enabled;
+    fa.page_size = page_size;
+
+    /* Set the property values & the driver for the FAPL */
+    if(H5P_set_driver(plist, H5FD_CORE, &fa) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set core VFD as driver")
+
+done:
+    FUNC_LEAVE_API(ret_value)
+} /* end H5Pset_core_write_tracking() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5Pget_core_write_tracking
+ *
+ * Purpose:    Gets information about core VFD write tracking and page
+ *              aggregation size.
+ *
+ * Return:    Non-negative on success/Negative on failure
+ *
+ * Programmer:  Dana Robinson
+ *              Tuesday, April 8, 2014
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5Pget_core_write_tracking(hid_t plist_id, hbool_t *is_enabled, size_t *page_size)
+{
+    H5P_genplist_t *plist;      /* Property list pointer */
+    const H5FD_core_fapl_t *fa; /* Core VFD info */
+    herr_t ret_value = SUCCEED; /* Return value */
+
+    FUNC_ENTER_API(FAIL)
+    H5TRACE3("e", "i*b*z", plist_id, is_enabled, page_size);
+
+    /* Get the plist structure */
+    if(NULL == (plist = H5P_object_verify(plist_id, H5P_FILE_ACCESS)))
+        HGOTO_ERROR(H5E_PLIST, H5E_BADATOM, FAIL, "can't find object for ID")
+    if(H5FD_CORE != H5P_peek_driver(plist))
+        HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "incorrect VFL driver")
+    if(NULL == (fa = (const H5FD_core_fapl_t *)H5P_peek_driver_info(plist)))
+        HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "bad VFL driver info")
+
+    /* Get values */
+    if(is_enabled)
+        *is_enabled = fa->write_tracking;
+    if(page_size)
+        *page_size = fa->page_size;
+
+done:
+    FUNC_LEAVE_API(ret_value)
+} /* end H5Pget_core_write_tracking() */
+
+
+/*-------------------------------------------------------------------------
  * Function:    H5Pset_fapl_core
  *
  * Purpose:     Modify the file access property list to use the H5FD_CORE
@@ -482,9 +581,9 @@ H5FD__core_term(void)
 herr_t
 H5Pset_fapl_core(hid_t fapl_id, size_t increment, hbool_t backing_store)
 {
-    H5FD_core_fapl_t    fa;
-    H5P_genplist_t      *plist;         /* Property list pointer */
-    herr_t              ret_value;
+    H5P_genplist_t *plist;      /* Property list pointer */
+    H5FD_core_fapl_t fa;        /* Core VFD info */
+    herr_t ret_value = SUCCEED; /* Return value */
 
     FUNC_ENTER_API(FAIL)
     H5TRACE3("e", "izb", fapl_id, increment, backing_store);
@@ -493,10 +592,16 @@ H5Pset_fapl_core(hid_t fapl_id, size_t increment, hbool_t backing_store)
     if(NULL == (plist = H5P_object_verify(fapl_id,H5P_FILE_ACCESS)))
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file access property list")
 
+    /* Set VFD info values */
+    HDmemset(&fa, 0, sizeof(H5FD_core_fapl_t));
     fa.increment = increment;
     fa.backing_store = backing_store;
+    fa.write_tracking = H5FD_CORE_WRITE_TRACKING_FLAG;
+    fa.page_size = H5FD_CORE_WRITE_TRACKING_PAGE_SIZE;
 
-    ret_value = H5P_set_driver(plist, H5FD_CORE, &fa);
+    /* Set the property values & the driver for the FAPL */
+    if(H5P_set_driver(plist, H5FD_CORE, &fa) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set core VFD as driver")
 
 done:
     FUNC_LEAVE_API(ret_value)
@@ -518,9 +623,9 @@ done:
 herr_t
 H5Pget_fapl_core(hid_t fapl_id, size_t *increment /*out*/, hbool_t *backing_store /*out*/)
 {
-    H5P_genplist_t      *plist;                 /* Property list pointer */
-    const H5FD_core_fapl_t    *fa;
-    herr_t              ret_value = SUCCEED;    /* Return value */
+    H5P_genplist_t *plist;      /* Property list pointer */
+    const H5FD_core_fapl_t *fa; /* Core VFD info */
+    herr_t ret_value = SUCCEED; /* Return value */
 
     FUNC_ENTER_API(FAIL)
     H5TRACE3("e", "ixx", fapl_id, increment, backing_store);
@@ -559,7 +664,7 @@ static void *
 H5FD__core_fapl_get(H5FD_t *_file)
 {
     H5FD_core_t         *file = (H5FD_core_t*)_file;
-    H5FD_core_fapl_t    *fa;
+    H5FD_core_fapl_t    *fa;                    /* Core VFD info */
     void                *ret_value = NULL;      /* Return value */
 
     FUNC_ENTER_STATIC
@@ -569,6 +674,8 @@ H5FD__core_fapl_get(H5FD_t *_file)
 
     fa->increment = file->increment;
     fa->backing_store = (hbool_t)(file->fd >= 0);
+    fa->write_tracking = file->write_tracking;
+    fa->page_size = file->bstore_page_size;
 
     /* Set return value */
     ret_value = fa;
@@ -776,35 +883,28 @@ H5FD__core_open(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxaddr
         } /* end if */
     } /* end if */
 
+    /* Get the write tracking & page size */
+    file->write_tracking = fa->write_tracking;
+    file->bstore_page_size = fa->page_size;
+
     /* Set up write tracking if the backing store is on */
     file->dirty_list = NULL;
     if(fa->backing_store) {
-        hbool_t write_tracking_flag = FALSE;    /* what the user asked for */
         hbool_t use_write_tracking = FALSE;     /* what we're actually doing */
 
-        /* Get the write tracking flag */
-        if(H5P_get(plist, H5F_ACS_CORE_WRITE_TRACKING_FLAG_NAME, &write_tracking_flag) < 0)
-            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get core VFD write tracking flag");
-
-        /* Get the page size */
-        if(H5P_get(plist, H5F_ACS_CORE_WRITE_TRACKING_PAGE_SIZE_NAME, &(file->bstore_page_size)) < 0)
-            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get core VFD write tracking page size");
-
         /* default is to have write tracking OFF for create (hence the check to see
          * if the user explicitly set a page size) and ON with the default page size
          * on open (when not read-only).
          */
         /* Only use write tracking if the file is open for writing */
-        use_write_tracking = 
-            TRUE == write_tracking_flag         /* user asked for write tracking */
-            && !(o_flags & O_RDONLY)            /* file is open for writing (i.e. not read-only) */
-            && file->bstore_page_size != 0;     /* page size is not zero */
+        use_write_tracking = (TRUE == fa->write_tracking)    /* user asked for write tracking */
+                    && !(o_flags & O_RDONLY)                /* file is open for writing (i.e. not read-only) */
+                    && (file->bstore_page_size != 0);         /* page size is not zero */
 
         /* initialize the dirty list */
-        if(use_write_tracking) {
+        if(use_write_tracking)
             if(NULL == (file->dirty_list = H5SL_create(H5SL_TYPE_HADDR, NULL)))
                 HGOTO_ERROR(H5E_SLIST, H5E_CANTCREATE, NULL, "can't create core vfd dirty region list");
-        } /* end if */
     } /* end if */
 
     /* Set return value */
diff --git a/src/H5FDdirect.c b/src/H5FDdirect.c
index 906ec28..10c368a 100644
--- a/src/H5FDdirect.c
+++ b/src/H5FDdirect.c
@@ -206,30 +206,27 @@ done:
 
 
 /*-------------------------------------------------------------------------
- * Function:  H5FD_direct_init
+ * Function:    H5FD_direct_init
  *
- * Purpose:  Initialize this driver by registering the driver with the
- *    library.
+ * Purpose:     Initialize this driver by registering the driver with the
+ *              library.
  *
- * Return:  Success:  The driver ID for the direct driver.
- *
- *    Failure:  Negative.
+ * Return:      Success:    The driver ID for the direct driver
+ *              Failure:    H5I_INVALID_HID
  *
  * Programmer:  Raymond Lu
  *              Wednesday, 20 September 2006
  *
- * Modifications:
- *
  *-------------------------------------------------------------------------
  */
 hid_t
 H5FD_direct_init(void)
 {
-    hid_t ret_value;        /* Return value */
+    hid_t ret_value = H5I_INVALID_HID;        /* Return value */
 
-    FUNC_ENTER_NOAPI(FAIL)
+    FUNC_ENTER_NOAPI(H5I_INVALID_HID)
 
-    if (H5I_VFL!=H5I_get_type(H5FD_DIRECT_g))
+    if (H5I_VFL != H5I_get_type(H5FD_DIRECT_g))
         H5FD_DIRECT_g = H5FD_register(&H5FD_direct_g,sizeof(H5FD_class_t),FALSE);
 
     /* Set return value */
@@ -237,7 +234,7 @@ H5FD_direct_init(void)
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
-}
+} /* end H5FD_direct_init() */
 
 
 /*---------------------------------------------------------------------------
@@ -291,6 +288,7 @@ H5Pset_fapl_direct(hid_t fapl_id, size_t boundary, size_t block_size, size_t cbu
     if(NULL == (plist = H5P_object_verify(fapl_id,H5P_FILE_ACCESS)))
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file access property list")
 
+    HDmemset(&fa, 0, sizeof(H5FD_direct_fapl_t));
     if(boundary != 0)
         fa.mboundary = boundary;
     else
@@ -417,7 +415,7 @@ static void *
 H5FD_direct_fapl_copy(const void *_old_fa)
 {
     const H5FD_direct_fapl_t *old_fa = (const H5FD_direct_fapl_t*)_old_fa;
-    H5FD_direct_fapl_t *new_fa = H5MM_malloc(sizeof(H5FD_direct_fapl_t));
+    H5FD_direct_fapl_t *new_fa = H5MM_calloc(sizeof(H5FD_direct_fapl_t));
 
     FUNC_ENTER_NOAPI_NOINIT_NOERR
 
diff --git a/src/H5FDfamily.c b/src/H5FDfamily.c
index e52a71a..4d40cf3 100644
--- a/src/H5FDfamily.c
+++ b/src/H5FDfamily.c
@@ -171,28 +171,25 @@ done:
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5FD_family_init
+ * Function:    H5FD_family_init
  *
- * Purpose:	Initialize this driver by registering the driver with the
- *		library.
+ * Purpose:     Initialize this driver by registering the driver with the
+ *              library.
  *
- * Return:	Success:	The driver ID for the family driver.
+ * Return:      Success:    The driver ID for the family driver
+ *              Failure:    H5I_INVALID_HID
  *
- *		Failure:	Negative
- *
- * Programmer:	Robb Matzke
+ * Programmer:  Robb Matzke
  *              Wednesday, August  4, 1999
  *
- * Modifications:
- *
  *-------------------------------------------------------------------------
  */
 hid_t
 H5FD_family_init(void)
 {
-    hid_t ret_value = H5FD_FAMILY_g;   /* Return value */
+    hid_t ret_value = H5I_INVALID_HID;   /* Return value */
 
-    FUNC_ENTER_NOAPI(FAIL)
+    FUNC_ENTER_NOAPI(H5I_INVALID_HID)
 
     if(H5I_VFL != H5I_get_type(H5FD_FAMILY_g))
         H5FD_FAMILY_g = H5FD_register(&H5FD_family_g, sizeof(H5FD_class_t), FALSE);
diff --git a/src/H5FDlog.c b/src/H5FDlog.c
index 3dcd7f5..97d1b41 100644
--- a/src/H5FDlog.c
+++ b/src/H5FDlog.c
@@ -252,8 +252,8 @@ done:
  * Purpose:     Initialize this driver by registering the driver with the
  *              library.
  *
- * Return:      Success:    The driver ID for the log driver.
- *              Failure:    Negative.
+ * Return:      Success:    The driver ID for the log driver
+ *              Failure:    H5I_INVALID_HID
  *
  * Programmer:  Robb Matzke
  *              Thursday, July 29, 1999
@@ -265,7 +265,7 @@ H5FD_log_init(void)
 {
     hid_t ret_value = H5I_INVALID_HID;  /* Return value */
 
-    FUNC_ENTER_NOAPI(FAIL)
+    FUNC_ENTER_NOAPI(H5I_INVALID_HID)
 
     if(H5I_VFL != H5I_get_type(H5FD_LOG_g))
         H5FD_LOG_g = H5FD_register(&H5FD_log_g, sizeof(H5FD_class_t), FALSE);
@@ -329,6 +329,8 @@ H5Pset_fapl_log(hid_t fapl_id, const char *logfile, unsigned long long flags, si
     if(NULL == (plist = H5P_object_verify(fapl_id, H5P_FILE_ACCESS)))
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file access property list")
 
+    HDmemset(&fa, 0, sizeof(H5FD_log_fapl_t));
+
     /* This shallow copy is correct! The string will be properly 
      * copied deep down in the H5P code. 
      */
diff --git a/src/H5FDmpio.c b/src/H5FDmpio.c
index 87f8b6a..3ab90aa 100644
--- a/src/H5FDmpio.c
+++ b/src/H5FDmpio.c
@@ -73,69 +73,69 @@ typedef struct H5FD_mpio_t {
 /* Private Prototypes */
 
 /* Callbacks */
-static herr_t H5FD_mpio_term(void);
-static void *H5FD_mpio_fapl_get(H5FD_t *_file);
-static void *H5FD_mpio_fapl_copy(const void *_old_fa);
-static herr_t H5FD_mpio_fapl_free(void *_fa);
-static H5FD_t *H5FD_mpio_open(const char *name, unsigned flags, hid_t fapl_id,
+static herr_t H5FD__mpio_term(void);
+static void *H5FD__mpio_fapl_get(H5FD_t *_file);
+static void *H5FD__mpio_fapl_copy(const void *_old_fa);
+static herr_t H5FD__mpio_fapl_free(void *_fa);
+static H5FD_t *H5FD__mpio_open(const char *name, unsigned flags, hid_t fapl_id,
 			      haddr_t maxaddr);
-static herr_t H5FD_mpio_close(H5FD_t *_file);
-static herr_t H5FD_mpio_query(const H5FD_t *_f1, unsigned long *flags);
-static haddr_t H5FD_mpio_get_eoa(const H5FD_t *_file, H5FD_mem_t type);
-static herr_t H5FD_mpio_set_eoa(H5FD_t *_file, H5FD_mem_t type, haddr_t addr);
-static haddr_t H5FD_mpio_get_eof(const H5FD_t *_file, H5FD_mem_t type);
-static herr_t  H5FD_mpio_get_handle(H5FD_t *_file, hid_t fapl, void** file_handle);
-static herr_t H5FD_mpio_read(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr,
+static herr_t H5FD__mpio_close(H5FD_t *_file);
+static herr_t H5FD__mpio_query(const H5FD_t *_f1, unsigned long *flags);
+static haddr_t H5FD__mpio_get_eoa(const H5FD_t *_file, H5FD_mem_t type);
+static herr_t H5FD__mpio_set_eoa(H5FD_t *_file, H5FD_mem_t type, haddr_t addr);
+static haddr_t H5FD__mpio_get_eof(const H5FD_t *_file, H5FD_mem_t type);
+static herr_t H5FD__mpio_get_handle(H5FD_t *_file, hid_t fapl, void** file_handle);
+static herr_t H5FD__mpio_read(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr,
             size_t size, void *buf);
-static herr_t H5FD_mpio_write(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr,
+static herr_t H5FD__mpio_write(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id, haddr_t addr,
             size_t size, const void *buf);
-static herr_t H5FD_mpio_flush(H5FD_t *_file, hid_t dxpl_id, hbool_t closing);
-static herr_t H5FD_mpio_truncate(H5FD_t *_file, hid_t dxpl_id, hbool_t closing);
-static int H5FD_mpio_mpi_rank(const H5FD_t *_file);
-static int H5FD_mpio_mpi_size(const H5FD_t *_file);
-static MPI_Comm H5FD_mpio_communicator(const H5FD_t *_file);
-static herr_t  H5FD_mpio_get_info(H5FD_t *_file, void** mpi_info);
+static herr_t H5FD__mpio_flush(H5FD_t *_file, hid_t dxpl_id, hbool_t closing);
+static herr_t H5FD__mpio_truncate(H5FD_t *_file, hid_t dxpl_id, hbool_t closing);
+static int H5FD__mpio_mpi_rank(const H5FD_t *_file);
+static int H5FD__mpio_mpi_size(const H5FD_t *_file);
+static MPI_Comm H5FD__mpio_communicator(const H5FD_t *_file);
+static herr_t H5FD__mpio_get_info(H5FD_t *_file, void** mpi_info);
 
 /* The MPIO file driver information */
 static const H5FD_class_mpi_t H5FD_mpio_g = {
     {   /* Start of superclass information */
     "mpio",					/*name			*/
     HADDR_MAX,					/*maxaddr		*/
-    H5F_CLOSE_SEMI,				/* fc_degree		*/
-    H5FD_mpio_term,                             /*terminate             */
+    H5F_CLOSE_SEMI,				/*fc_degree		*/
+    H5FD__mpio_term,                            /*terminate             */
     NULL,					/*sb_size		*/
     NULL,					/*sb_encode		*/
     NULL,					/*sb_decode		*/
     sizeof(H5FD_mpio_fapl_t),			/*fapl_size		*/
-    H5FD_mpio_fapl_get,				/*fapl_get		*/
-    H5FD_mpio_fapl_copy,			/*fapl_copy		*/
-    H5FD_mpio_fapl_free, 			/*fapl_free		*/
+    H5FD__mpio_fapl_get,			/*fapl_get		*/
+    H5FD__mpio_fapl_copy,			/*fapl_copy		*/
+    H5FD__mpio_fapl_free, 			/*fapl_free		*/
     0,		                		/*dxpl_size		*/
     NULL,					/*dxpl_copy		*/
     NULL,					/*dxpl_free		*/
-    H5FD_mpio_open,				/*open			*/
-    H5FD_mpio_close,				/*close			*/
+    H5FD__mpio_open,				/*open			*/
+    H5FD__mpio_close,				/*close			*/
     NULL,					/*cmp			*/
-    H5FD_mpio_query,		                /*query			*/
+    H5FD__mpio_query,		                /*query			*/
     NULL,					/*get_type_map		*/
     NULL,					/*alloc			*/
     NULL,					/*free			*/
-    H5FD_mpio_get_eoa,				/*get_eoa		*/
-    H5FD_mpio_set_eoa, 				/*set_eoa		*/
-    H5FD_mpio_get_eof,				/*get_eof		*/
-    H5FD_mpio_get_handle,                       /*get_handle            */
-    H5FD_mpio_read,				/*read			*/
-    H5FD_mpio_write,				/*write			*/
-    H5FD_mpio_flush,				/*flush			*/
-    H5FD_mpio_truncate,				/*truncate		*/
+    H5FD__mpio_get_eoa,				/*get_eoa		*/
+    H5FD__mpio_set_eoa, 			/*set_eoa		*/
+    H5FD__mpio_get_eof,				/*get_eof		*/
+    H5FD__mpio_get_handle,                      /*get_handle            */
+    H5FD__mpio_read,				/*read			*/
+    H5FD__mpio_write,				/*write			*/
+    H5FD__mpio_flush,				/*flush			*/
+    H5FD__mpio_truncate,			/*truncate		*/
     NULL,                                       /*lock                  */
     NULL,                                       /*unlock                */
     H5FD_FLMAP_DICHOTOMY                        /*fl_map                */
     },  /* End of superclass information */
-    H5FD_mpio_mpi_rank,                         /*get_rank              */
-    H5FD_mpio_mpi_size,                         /*get_size              */
-    H5FD_mpio_communicator,                     /*get_comm              */
-    H5FD_mpio_get_info                          /*get_info              */
+    H5FD__mpio_mpi_rank,                        /*get_rank              */
+    H5FD__mpio_mpi_size,                        /*get_size              */
+    H5FD__mpio_communicator,                    /*get_comm              */
+    H5FD__mpio_get_info                         /*get_info              */
 };
 
 #ifdef H5FDmpio_DEBUG
@@ -162,10 +162,13 @@ static int H5FD_mpio_Debug[256] =
 /*--------------------------------------------------------------------------
 NAME
    H5FD__init_package -- Initialize interface-specific information
+
 USAGE
     herr_t H5FD__init_package()
+
 RETURNS
     Non-negative on success/Negative on failure
+
 DESCRIPTION
     Initializes any interface-specific data or routines.  (Just calls
     H5FD_mpio_init currently).
@@ -187,15 +190,15 @@ done:
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5FD_mpio_init
+ * Function:    H5FD_mpio_init
  *
- * Purpose:	Initialize this driver by registering the driver with the
- *		library.
+ * Purpose:     Initialize this driver by registering the driver with the
+ *              library.
  *
- * Return:	Success:	The driver ID for the mpio driver.
- *		Failure:	Negative.
+ * Return:      Success:    The driver ID for the mpio driver
+ *              Failure:    H5I_INVALID_HID
  *
- * Programmer:	Robb Matzke
+ * Programmer:  Robb Matzke
  *              Thursday, August 5, 1999
  *
  *-------------------------------------------------------------------------
@@ -206,10 +209,10 @@ H5FD_mpio_init(void)
 #ifdef H5FDmpio_DEBUG
     static int H5FD_mpio_Debug_inited = 0;
 #endif /* H5FDmpio_DEBUG */
-    const char *s;              /* String for environment variables */
-    hid_t ret_value;        	/* Return value */
+    const char *s;                          /* String for environment variables */
+    hid_t ret_value = H5I_INVALID_HID;      /* Return value */
 
-    FUNC_ENTER_NOAPI(FAIL)
+    FUNC_ENTER_NOAPI(H5I_INVALID_HID)
 
     /* Register the MPI-IO VFD, if it isn't already */
     if(H5I_VFL != H5I_get_type(H5FD_MPIO_g))
@@ -217,8 +220,10 @@ H5FD_mpio_init(void)
 
     /* Allow MPI buf-and-file-type optimizations? */
     s = HDgetenv("HDF5_MPI_OPT_TYPES");
-    if(s && HDisdigit(*s))
-        H5FD_mpi_opt_types_g = (hbool_t)HDstrtol(s, NULL, 0);
+    if(s && HDisdigit(*s)) {
+        long env_val = HDstrtol(s, NULL, 0);
+        H5FD_mpi_opt_types_g = (0 == env_val) ? FALSE : TRUE;
+    }
 
 #ifdef H5FDmpio_DEBUG
     if(!H5FD_mpio_Debug_inited) {
@@ -226,12 +231,12 @@ H5FD_mpio_init(void)
         s = HDgetenv("H5FD_mpio_Debug");
         if(s) {
             /* Set debug mask */
-	    while(*s) {
-		H5FD_mpio_Debug[(int)*s]++;
-		s++;
-	    } /* end while */
+            while(*s) {
+                H5FD_mpio_Debug[(int)*s]++;
+                s++;
+            } /* end while */
         } /* end if */
-	H5FD_mpio_Debug_inited++;
+        H5FD_mpio_Debug_inited++;
     } /* end if */
 #endif /* H5FDmpio_DEBUG */
 
@@ -244,7 +249,7 @@ done:
 
 
 /*---------------------------------------------------------------------------
- * Function:	H5FD_mpio_term
+ * Function:	H5FD__mpio_term
  *
  * Purpose:	Shut down the VFD
  *
@@ -256,15 +261,15 @@ done:
  *---------------------------------------------------------------------------
  */
 static herr_t
-H5FD_mpio_term(void)
+H5FD__mpio_term(void)
 {
-    FUNC_ENTER_NOAPI_NOINIT_NOERR
+    FUNC_ENTER_STATIC
 
     /* Reset VFL ID */
-    H5FD_MPIO_g=0;
+    H5FD_MPIO_g = 0;
 
     FUNC_LEAVE_NOAPI(SUCCEED)
-} /* end H5FD_mpio_term() */
+} /* end H5FD__mpio_term() */
 
 
 /*-------------------------------------------------------------------------
@@ -291,7 +296,6 @@ H5FD_mpio_term(void)
  *              are freed.
  *
  * Return:	Success:	Non-negative
- *
  * 		Failure:	Negative
  *
  * Programmer:	Albert Cheng
@@ -309,16 +313,16 @@ H5Pset_fapl_mpio(hid_t fapl_id, MPI_Comm comm, MPI_Info info)
     FUNC_ENTER_API(FAIL)
     H5TRACE3("e", "iMcMi", fapl_id, comm, info);
 
+    /* Check arguments */
     if(fapl_id == H5P_DEFAULT)
         HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "can't set values in default property list")
-
-    /* Check arguments */
     if(NULL == (plist = H5P_object_verify(fapl_id, H5P_FILE_ACCESS)))
         HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "not a file access list")
     if(MPI_COMM_NULL == comm)
 	HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "not a valid communicator")
 
     /* Initialize driver specific properties */
+    HDmemset(&fa, 0, sizeof(H5FD_mpio_fapl_t));
     fa.comm = comm;
     fa.info = info;
 
@@ -346,7 +350,6 @@ done:
  *				modifications to the access property list do
  *				not affect them and it is the responsibility
  *				of the application to free them.
- *
  * 		Failure:	Negative
  *
  * Programmer:	Robb Matzke
@@ -367,6 +370,7 @@ H5Pget_fapl_mpio(hid_t fapl_id, MPI_Comm *comm/*out*/, MPI_Info *info/*out*/)
     FUNC_ENTER_API(FAIL)
     H5TRACE3("e", "ixx", fapl_id, comm, info);
 
+    /* Check arguments */
     if(NULL == (plist = H5P_object_verify(fapl_id, H5P_FILE_ACCESS)))
         HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "not a file access list")
     if(H5FD_MPIO != H5P_peek_driver(plist))
@@ -439,10 +443,9 @@ H5Pset_dxpl_mpio(hid_t dxpl_id, H5FD_mpio_xfer_t xfer_mode)
     FUNC_ENTER_API(FAIL)
     H5TRACE2("e", "iDt", dxpl_id, xfer_mode);
 
+    /* Check arguments */
     if(dxpl_id == H5P_DEFAULT)
         HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "can't set values in default property list")
-
-    /* Check arguments */
     if(NULL == (plist = H5P_object_verify(dxpl_id, H5P_DATASET_XFER)))
         HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "not a dxpl")
     if(H5FD_MPIO_INDEPENDENT != xfer_mode && H5FD_MPIO_COLLECTIVE != xfer_mode)
@@ -466,7 +469,6 @@ done:
  * Return:	Success:	Non-negative, with the transfer mode returned
  *				through the XFER_MODE argument if it is
  *				non-null.
- *
  * 		Failure:	Negative
  *
  * Programmer:	Albert Cheng
@@ -483,6 +485,7 @@ H5Pget_dxpl_mpio(hid_t dxpl_id, H5FD_mpio_xfer_t *xfer_mode/*out*/)
     FUNC_ENTER_API(FAIL)
     H5TRACE2("e", "ix", dxpl_id, xfer_mode);
 
+    /* Check arguments */
     if(NULL == (plist = H5P_object_verify(dxpl_id, H5P_DATASET_XFER)))
         HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "not a dxpl")
 
@@ -524,10 +527,9 @@ H5Pset_dxpl_mpio_collective_opt(hid_t dxpl_id, H5FD_mpio_collective_opt_t opt_mo
     FUNC_ENTER_API(FAIL)
     H5TRACE2("e", "iDc", dxpl_id, opt_mode);
 
+    /* Check arguments */
     if(dxpl_id == H5P_DEFAULT)
         HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "can't set values in default property list")
-
-    /* Check arguments */
     if(NULL == (plist = H5P_object_verify(dxpl_id, H5P_DATASET_XFER)))
         HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "not a dxpl")
 
@@ -568,10 +570,9 @@ H5Pset_dxpl_mpio_chunk_opt(hid_t dxpl_id, H5FD_mpio_chunk_opt_t opt_mode)
     FUNC_ENTER_API(FAIL)
     H5TRACE2("e", "iDh", dxpl_id, opt_mode);
 
+    /* Check arguments */
     if(dxpl_id == H5P_DEFAULT)
         HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "can't set values in default property list")
-
-    /* Check arguments */
     if(NULL == (plist = H5P_object_verify(dxpl_id, H5P_DATASET_XFER)))
         HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "not a dxpl")
 
@@ -610,10 +611,9 @@ H5Pset_dxpl_mpio_chunk_opt_num(hid_t dxpl_id, unsigned num_chunk_per_proc)
     FUNC_ENTER_API(FAIL)
     H5TRACE2("e", "iIu", dxpl_id, num_chunk_per_proc);
 
+    /* Check arguments */
     if(dxpl_id == H5P_DEFAULT)
         HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "can't set values in default property list")
-
-    /* Check arguments */
     if(NULL == (plist = H5P_object_verify(dxpl_id, H5P_DATASET_XFER)))
         HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "not a dxpl")
 
@@ -655,10 +655,9 @@ H5Pset_dxpl_mpio_chunk_opt_ratio(hid_t dxpl_id, unsigned percent_num_proc_per_ch
     FUNC_ENTER_API(FAIL)
     H5TRACE2("e", "iIu", dxpl_id, percent_num_proc_per_chunk);
 
+    /* Check arguments */
     if(dxpl_id == H5P_DEFAULT)
         HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "can't set values in default property list")
-
-    /* Check arguments */
     if(NULL == (plist = H5P_object_verify(dxpl_id, H5P_DATASET_XFER)))
         HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "not a dxpl")
 
@@ -672,14 +671,13 @@ done:
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5FD_mpio_fapl_get
+ * Function:	H5FD__mpio_fapl_get
  *
  * Purpose:	Returns a file access property list which could be used to
  *		create another file the same as this one.
  *
  * Return:	Success:	Ptr to new file access property list with all
  *				fields copied from the file pointer.
- *
  *		Failure:	NULL
  *
  * Programmer:	Robb Matzke
@@ -688,17 +686,19 @@ done:
  *-------------------------------------------------------------------------
  */
 static void *
-H5FD_mpio_fapl_get(H5FD_t *_file)
+H5FD__mpio_fapl_get(H5FD_t *_file)
 {
     H5FD_mpio_t		*file = (H5FD_mpio_t*)_file;
     H5FD_mpio_fapl_t	*fa = NULL;
     void      *ret_value;       /* Return value */
 
-    FUNC_ENTER_NOAPI_NOINIT
+    FUNC_ENTER_STATIC
 
+    /* Sanity checks */
     HDassert(file);
     HDassert(H5FD_MPIO == file->pub.driver_id);
 
+    /* Check arguments */
     if(NULL == (fa = (H5FD_mpio_fapl_t *)H5MM_calloc(sizeof(H5FD_mpio_fapl_t))))
         HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")
 
@@ -711,16 +711,15 @@ H5FD_mpio_fapl_get(H5FD_t *_file)
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
-}
+} /* end H5FD__mpio_fapl_get() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5FD_mpio_fapl_copy
+ * Function:	H5FD__mpio_fapl_copy
  *
  * Purpose:	Copies the mpio-specific file access properties.
  *
  * Return:	Success:	Ptr to a new property list
- *
  *		Failure:	NULL
  *
  * Programmer:	Albert Cheng
@@ -729,16 +728,17 @@ done:
  *-------------------------------------------------------------------------
  */
 static void *
-H5FD_mpio_fapl_copy(const void *_old_fa)
+H5FD__mpio_fapl_copy(const void *_old_fa)
 {
-    void		*ret_value = NULL;
     const H5FD_mpio_fapl_t *old_fa = (const H5FD_mpio_fapl_t*)_old_fa;
     H5FD_mpio_fapl_t	*new_fa = NULL;
+    void		*ret_value = NULL;
+
+    FUNC_ENTER_STATIC
 
-    FUNC_ENTER_NOAPI_NOINIT
 #ifdef H5FDmpio_DEBUG
-if (H5FD_mpio_Debug[(int)'t'])
-fprintf(stderr, "enter H5FD_mpio_fapl_copy\n");
+if(H5FD_mpio_Debug[(int)'t'])
+    HDfprintf(stderr, "%s: entering\n", FUNC);
 #endif
 
     if(NULL == (new_fa = (H5FD_mpio_fapl_t *)H5MM_malloc(sizeof(H5FD_mpio_fapl_t))))
@@ -748,65 +748,68 @@ fprintf(stderr, "enter H5FD_mpio_fapl_copy\n");
     HDmemcpy(new_fa, old_fa, sizeof(H5FD_mpio_fapl_t));
 
     /* Duplicate communicator and Info object. */
-    if(FAIL == H5FD_mpi_comm_info_dup(old_fa->comm, old_fa->info, &new_fa->comm, &new_fa->info))
+    if(H5FD_mpi_comm_info_dup(old_fa->comm, old_fa->info, &new_fa->comm, &new_fa->info) < 0)
 	HGOTO_ERROR(H5E_INTERNAL, H5E_CANTCOPY, NULL, "Communicator/Info duplicate failed")
+
+    /* Set return value */
     ret_value = new_fa;
 
 done:
-    if (NULL == ret_value){
+    if(NULL == ret_value)
 	/* cleanup */
-	if (new_fa)
+	if(new_fa)
 	    H5MM_xfree(new_fa);
-    }
 
 #ifdef H5FDmpio_DEBUG
-if (H5FD_mpio_Debug[(int)'t'])
-fprintf(stderr, "leaving H5FD_mpio_fapl_copy\n");
+if(H5FD_mpio_Debug[(int)'t'])
+    HDfprintf(stderr, "%s: leaving\n", FUNC);
 #endif
+
     FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5FD_mpio_fapl_copy() */
+} /* end H5FD__mpio_fapl_copy() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5FD_mpio_fapl_free
+ * Function:	H5FD__mpio_fapl_free
  *
  * Purpose:	Frees the mpio-specific file access properties.
  *
  * Return:	Success:	0
- *
  *		Failure:	-1
  *
  * Programmer:	Albert Cheng
  *              Jan  8, 2003
  *
- * Modifications:
- *
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5FD_mpio_fapl_free(void *_fa)
+H5FD__mpio_fapl_free(void *_fa)
 {
-    herr_t		ret_value = SUCCEED;
     H5FD_mpio_fapl_t	*fa = (H5FD_mpio_fapl_t*)_fa;
+    herr_t		ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
 
-    FUNC_ENTER_NOAPI_NOINIT_NOERR
 #ifdef H5FDmpio_DEBUG
-if (H5FD_mpio_Debug[(int)'t'])
-fprintf(stderr, "in H5FD_mpio_fapl_free\n");
+if(H5FD_mpio_Debug[(int)'t'])
+    HDfprintf(stderr, "%s: Entering\n", FUNC);
 #endif
+
+    /* Sanity checks */
     HDassert(fa);
 
     /* Free the internal communicator and INFO object */
-    HDassert(MPI_COMM_NULL!=fa->comm);
+    HDassert(MPI_COMM_NULL != fa->comm);
     H5FD_mpi_comm_info_free(&fa->comm, &fa->info);
     H5MM_xfree(fa);
 
 #ifdef H5FDmpio_DEBUG
-if (H5FD_mpio_Debug[(int)'t'])
-fprintf(stderr, "leaving H5FD_mpio_fapl_free\n");
+if(H5FD_mpio_Debug[(int)'t'])
+    HDfprintf(stderr, "%s: leaving\n", FUNC);
 #endif
+
     FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5FD_mpio_fapl_free() */
+} /* end H5FD__mpio_fapl_free() */
 
 
 /*-------------------------------------------------------------------------
@@ -834,26 +837,27 @@ H5FD_set_mpio_atomicity(H5FD_t *_file, hbool_t flag)
     FUNC_ENTER_NOAPI_NOINIT
 
 #ifdef H5FDmpio_DEBUG
-    if (H5FD_mpio_Debug[(int)'t'])
-    	fprintf(stdout, "Entering H5FD_set_mpio_atomicity\n");
+    if(H5FD_mpio_Debug[(int)'t'])
+    	HDfprintf(stdout, "%s: Entering\n", FUNC);
 #endif
 
-    if (FALSE == flag)
+    if(FALSE == flag)
         temp_flag = 0;
     else
         temp_flag = 1;
 
     /* set atomicity value */
-    if (MPI_SUCCESS != (mpi_code=MPI_File_set_atomicity(file->f, temp_flag)))
+    if(MPI_SUCCESS != (mpi_code = MPI_File_set_atomicity(file->f, temp_flag)))
         HMPI_GOTO_ERROR(FAIL, "MPI_File_set_atomicity", mpi_code)
 
 done:
 #ifdef H5FDmpio_DEBUG
-    if (H5FD_mpio_Debug[(int)'t'])
-    	fprintf(stdout, "Leaving H5FD_set_mpio_atomicity\n");
+    if(H5FD_mpio_Debug[(int)'t'])
+    	HDfprintf(stdout, "%s: Leaving\n", FUNC);
 #endif
+
     FUNC_LEAVE_NOAPI(ret_value)
-}
+} /* end H5FD_set_mpio_atomicity() */
 
 
 /*-------------------------------------------------------------------------
@@ -881,30 +885,31 @@ H5FD_get_mpio_atomicity(H5FD_t *_file, hbool_t *flag)
     FUNC_ENTER_NOAPI_NOINIT
 
 #ifdef H5FDmpio_DEBUG
-    if (H5FD_mpio_Debug[(int)'t'])
-    	fprintf(stdout, "Entering H5FD_get_mpio_atomicity\n");
+    if(H5FD_mpio_Debug[(int)'t'])
+    	HDfprintf(stdout, "%s: Entering\n", FUNC);
 #endif
 
-    /* get atomicity value */
-    if (MPI_SUCCESS != (mpi_code=MPI_File_get_atomicity(file->f, &temp_flag)))
+    /* Get atomicity value */
+    if(MPI_SUCCESS != (mpi_code = MPI_File_get_atomicity(file->f, &temp_flag)))
         HMPI_GOTO_ERROR(FAIL, "MPI_File_get_atomicity", mpi_code)
 
-    if (0 != temp_flag)
+    if(0 != temp_flag)
         *flag = TRUE;
     else
         *flag = FALSE;
 
 done:
 #ifdef H5FDmpio_DEBUG
-    if (H5FD_mpio_Debug[(int)'t'])
-    	fprintf(stdout, "Leaving H5FD_get_mpio_atomicity\n");
+    if(H5FD_mpio_Debug[(int)'t'])
+    	HDfprintf(stdout, "%s: Leaving\n", FUNC);
 #endif
+
     FUNC_LEAVE_NOAPI(ret_value)
-}
+} /* end H5FD_get_mpio_atomicity() */
 
 
 /*-------------------------------------------------------------------------
- * Function:    H5FD_mpio_open
+ * Function:    H5FD__mpio_open
  *
  * Purpose:     Opens a file with name NAME.  The FLAGS are a bit field with
  *		purpose similar to the second argument of open(2) and which
@@ -914,21 +919,20 @@ done:
  *		access.  This is collective.
  *
  * Return:      Success:        A new file pointer.
- *
  *              Failure:        NULL
  *
- * Programmer:
+ * Programmer:  Robert Kim Yates
  *              January 30, 1998
  *
  *-------------------------------------------------------------------------
  */
 static H5FD_t *
-H5FD_mpio_open(const char *name, unsigned flags, hid_t fapl_id,
-	       haddr_t H5_ATTR_UNUSED maxaddr)
+H5FD__mpio_open(const char *name, unsigned flags, hid_t fapl_id,
+    haddr_t H5_ATTR_UNUSED maxaddr)
 {
-    H5FD_mpio_t			*file=NULL;
+    H5FD_mpio_t			*file = NULL;
     MPI_File			fh;
-    unsigned                    file_opened=0;  /* Flag to indicate that the file was successfully opened */
+    unsigned                    file_opened = 0; /* Flag to indicate that the file was successfully opened */
     int				mpi_amode;
     int				mpi_rank;       /* MPI rank of this process */
     int				mpi_size;       /* Total number of MPI processes */
@@ -941,13 +945,11 @@ H5FD_mpio_open(const char *name, unsigned flags, hid_t fapl_id,
     MPI_Info                    info_dup = MPI_INFO_NULL;
     H5FD_t			*ret_value;     /* Return value */
 
-    FUNC_ENTER_NOAPI_NOINIT
+    FUNC_ENTER_STATIC
 
 #ifdef H5FDmpio_DEBUG
-    if (H5FD_mpio_Debug[(int)'t']) {
-    	fprintf(stdout, "Entering H5FD_mpio_open(name=\"%s\", flags=0x%x, "
-		"fapl_id=%d, maxaddr=%lu)\n", name, flags, (int)fapl_id, (unsigned long)maxaddr);
-    }
+    if(H5FD_mpio_Debug[(int)'t'])
+    	HDfprintf(stdout, "%s: Entering - name = \"%s\", flags = 0x%x, fapl_id = %d, maxaddr = %lu\n", FUNC, name, flags, (int)fapl_id, (unsigned long)maxaddr);
 #endif
 
     /* Obtain a pointer to mpio-specific file access properties */
@@ -958,10 +960,9 @@ H5FD_mpio_open(const char *name, unsigned flags, hid_t fapl_id,
 	_fa.info = MPI_INFO_NULL; /*default*/
 	fa = &_fa;
     } /* end if */
-    else {
+    else
         if(NULL == (fa = (const H5FD_mpio_fapl_t *)H5P_peek_driver_info(plist)))
 	    HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, NULL, "bad VFL driver info")
-    } /* end else */
 
     /* Duplicate communicator and Info object for use by this file. */
     if(FAIL == H5FD_mpi_comm_info_dup(fa->comm, fa->info, &comm_dup, &info_dup))
@@ -977,21 +978,19 @@ H5FD_mpio_open(const char *name, unsigned flags, hid_t fapl_id,
 
 #ifdef H5FDmpio_DEBUG
     /* Check for debug commands in the info parameter */
-    {
-        if(MPI_INFO_NULL != info_dup) {
-            char debug_str[128];
-            int flag;
-
-            MPI_Info_get(fa->info, H5F_MPIO_DEBUG_KEY, sizeof(debug_str) - 1, debug_str, &flag);
-            if(flag) {
-                int i;
-
-                fprintf(stdout, "H5FD_mpio debug flags = '%s'\n", debug_str);
-                for(i = 0; debug_str[i]/*end of string*/ && i < 128/*just in case*/; ++i)
-                    H5FD_mpio_Debug[(int)debug_str[i]] = 1;
-            }
-        }
-    }
+    if(MPI_INFO_NULL != info_dup) {
+        char debug_str[128];
+        int flag;
+
+        MPI_Info_get(fa->info, H5F_MPIO_DEBUG_KEY, sizeof(debug_str) - 1, debug_str, &flag);
+        if(flag) {
+            int i;
+
+            HDfprintf(stdout, "H5FD_mpio debug flags = '%s'\n", debug_str);
+            for(i = 0; debug_str[i]/*end of string*/ && i < 128/*just in case*/; ++i)
+                H5FD_mpio_Debug[(int)debug_str[i]] = 1;
+        } /* end if */
+    } /* end if */
 #endif
 
     if(MPI_SUCCESS != (mpi_code = MPI_File_open(comm_dup, name, mpi_amode, info_dup, &fh)))
@@ -1041,69 +1040,62 @@ H5FD_mpio_open(const char *name, unsigned flags, hid_t fapl_id,
     file->local_eof = file->eof;
 
     /* Set return value */
-    ret_value=(H5FD_t*)file;
+    ret_value = (H5FD_t*)file;
 
 done:
-    if(ret_value==NULL) {
+    if(ret_value == NULL) {
         if(file_opened)
             MPI_File_close(&fh);
-	if (MPI_COMM_NULL != comm_dup)
+	if(MPI_COMM_NULL != comm_dup)
 	    MPI_Comm_free(&comm_dup);
-	if (MPI_INFO_NULL != info_dup)
+	if(MPI_INFO_NULL != info_dup)
 	    MPI_Info_free(&info_dup);
-	if (file)
+	if(file)
 	    H5MM_xfree(file);
     } /* end if */
 
 #ifdef H5FDmpio_DEBUG
-    if (H5FD_mpio_Debug[(int)'t'])
-        fprintf(stdout, "Leaving H5FD_mpio_open\n" );
+    if(H5FD_mpio_Debug[(int)'t'])
+        HDfprintf(stdout, "%s: Leaving\n", FUNC);
 #endif
+
     FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5FD_mpio_open() */
+} /* end H5FD__mpio_open() */
 
 
 /*-------------------------------------------------------------------------
- * Function:    H5FD_mpio_close
+ * Function:    H5FD__mpio_close
  *
  * Purpose:     Closes a file.  This is collective.
  *
  * Return:      Success:	Non-negative
- *
  * 		Failure:	Negative
  *
  * Programmer:  Unknown
  *              January 30, 1998
  *
- * Modifications:
- * 		Robb Matzke, 1998-02-18
- *		Added the ACCESS_PARMS argument.
- *
- * 		Robb Matzke, 1999-08-06
- *		Modified to work with the virtual file layer.
- *
- * 		Albert Cheng, 2003-04-17
- *		Free the communicator stored.
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5FD_mpio_close(H5FD_t *_file)
+H5FD__mpio_close(H5FD_t *_file)
 {
     H5FD_mpio_t	*file = (H5FD_mpio_t*)_file;
     int		mpi_code;	        /* MPI return code */
-    herr_t      ret_value=SUCCEED;      /* Return value */
+    herr_t      ret_value = SUCCEED;    /* Return value */
 
-    FUNC_ENTER_NOAPI_NOINIT
+    FUNC_ENTER_STATIC
 
 #ifdef H5FDmpio_DEBUG
-    if (H5FD_mpio_Debug[(int)'t'])
-    	fprintf(stdout, "Entering H5FD_mpio_close\n");
+    if(H5FD_mpio_Debug[(int)'t'])
+    	HDfprintf(stdout, "%s: Entering\n", FUNC);
 #endif
+
+    /* Sanity checks */
     HDassert(file);
-    HDassert(H5FD_MPIO==file->pub.driver_id);
+    HDassert(H5FD_MPIO == file->pub.driver_id);
 
     /* MPI_File_close sets argument to MPI_FILE_NULL */
-    if (MPI_SUCCESS != (mpi_code=MPI_File_close(&(file->f)/*in,out*/)))
+    if(MPI_SUCCESS != (mpi_code = MPI_File_close(&(file->f)/*in,out*/)))
         HMPI_GOTO_ERROR(FAIL, "MPI_File_close failed", mpi_code)
 
     /* Clean up other stuff */
@@ -1112,45 +1104,36 @@ H5FD_mpio_close(H5FD_t *_file)
 
 done:
 #ifdef H5FDmpio_DEBUG
-    if (H5FD_mpio_Debug[(int)'t'])
-    	fprintf(stdout, "Leaving H5FD_mpio_close\n");
+    if(H5FD_mpio_Debug[(int)'t'])
+    	HDfprintf(stdout, "%s: Leaving\n", FUNC);
 #endif
+
     FUNC_LEAVE_NOAPI(ret_value)
-}
+} /* end H5FD__mpio_close() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5FD_mpio_query
+ * Function:	H5FD__mpio_query
  *
  * Purpose:	Set the flags that this VFL driver is capable of supporting.
  *              (listed in H5FDpublic.h)
  *
  * Return:	Success:	non-negative
- *
  *		Failure:	negative
  *
  * Programmer:	Quincey Koziol
  *              Friday, August 25, 2000
  *
- * Modifications:
- *
- *		John Mainzer -- 9/21/05
- *		Modified code to turn off the
- *		H5FD_FEAT_ACCUMULATE_METADATA_WRITE flag.
- *              With the movement of
- *		all cache writes to process 0, this flag has become
- *		problematic in PHDF5.
- *
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5FD_mpio_query(const H5FD_t H5_ATTR_UNUSED *_file, unsigned long *flags /* out */)
+H5FD__mpio_query(const H5FD_t H5_ATTR_UNUSED *_file, unsigned long *flags /* out */)
 {
-    FUNC_ENTER_NOAPI_NOINIT_NOERR
+    FUNC_ENTER_STATIC
 
     /* Set the VFL feature flags that this driver supports */
     if(flags) {
-        *flags=0;
+        *flags = 0;
         *flags |= H5FD_FEAT_AGGREGATE_METADATA;     /* OK to aggregate metadata allocations                             */
         *flags |= H5FD_FEAT_AGGREGATE_SMALLDATA;    /* OK to aggregate "small" raw data allocations                     */
         *flags |= H5FD_FEAT_HAS_MPI;                /* This driver uses MPI                                             */
@@ -1159,83 +1142,73 @@ H5FD_mpio_query(const H5FD_t H5_ATTR_UNUSED *_file, unsigned long *flags /* out
     } /* end if */
 
     FUNC_LEAVE_NOAPI(SUCCEED)
-}
+} /* end H5FD__mpio_query() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5FD_mpio_get_eoa
+ * Function:	H5FD__mpio_get_eoa
  *
  * Purpose:	Gets the end-of-address marker for the file. The EOA marker
  *		is the first address past the last byte allocated in the
  *		format address space.
  *
  * Return:	Success:	The end-of-address marker.
- *
  *		Failure:	HADDR_UNDEF
  *
  * Programmer:	Robb Matzke
  *              Friday, August  6, 1999
  *
- * Modifications:
- *              Raymond Lu
- *              21 Dec. 2006
- *              Added the parameter TYPE.  It's only used for MULTI driver.
- *
  *-------------------------------------------------------------------------
  */
 static haddr_t
-H5FD_mpio_get_eoa(const H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type)
+H5FD__mpio_get_eoa(const H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type)
 {
     const H5FD_mpio_t	*file = (const H5FD_mpio_t*)_file;
 
-    FUNC_ENTER_NOAPI_NOINIT_NOERR
+    FUNC_ENTER_STATIC
 
+    /* Sanity checks */
     HDassert(file);
-    HDassert(H5FD_MPIO==file->pub.driver_id);
+    HDassert(H5FD_MPIO == file->pub.driver_id);
 
     FUNC_LEAVE_NOAPI(file->eoa)
-}
+} /* end H5FD__mpio_get_eoa() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5FD_mpio_set_eoa
+ * Function:	H5FD__mpio_set_eoa
  *
  * Purpose:	Set the end-of-address marker for the file. This function is
  *		called shortly after an existing HDF5 file is opened in order
  *		to tell the driver where the end of the HDF5 data is located.
  *
  * Return:	Success:	0
- *
  *		Failure:	-1
  *
  * Programmer:	Robb Matzke
  *              Friday, August 6, 1999
  *
- * Modifications:
- *              Raymond Lu
- *              21 Dec. 2006
- *              Added the parameter TYPE.  It's only used for MULTI driver.
- *
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5FD_mpio_set_eoa(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type, haddr_t addr)
+H5FD__mpio_set_eoa(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type, haddr_t addr)
 {
     H5FD_mpio_t	*file = (H5FD_mpio_t*)_file;
 
-    FUNC_ENTER_NOAPI_NOINIT_NOERR
+    FUNC_ENTER_STATIC
 
+    /* Sanity checks */
     HDassert(file);
-    HDassert(H5FD_MPIO==file->pub.driver_id);
+    HDassert(H5FD_MPIO == file->pub.driver_id);
 
     file->eoa = addr;
 
     FUNC_LEAVE_NOAPI(SUCCEED)
-}
+} /* end H5FD__mpio_set_eoa() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5FD_mpio_get_eof
+ * Function:	H5FD__mpio_get_eof
  *
  * Purpose:	Gets the end-of-file marker for the file. The EOF marker
  *		is the real size of the file.
@@ -1253,32 +1226,30 @@ H5FD_mpio_set_eoa(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type, haddr_t addr)
  *              file. -QAK
  *
  * Return:	Success:	The end-of-address marker.
- *
  *		Failure:	HADDR_UNDEF
  *
  * Programmer:	Robb Matzke
  *              Friday, August  6, 1999
  *
- * Modifications:
- *
  *-------------------------------------------------------------------------
  */
 static haddr_t
-H5FD_mpio_get_eof(const H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type)
+H5FD__mpio_get_eof(const H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type)
 {
     const H5FD_mpio_t	*file = (const H5FD_mpio_t*)_file;
 
-    FUNC_ENTER_NOAPI_NOINIT_NOERR
+    FUNC_ENTER_STATIC
 
+    /* Sanity checks */
     HDassert(file);
-    HDassert(H5FD_MPIO==file->pub.driver_id);
+    HDassert(H5FD_MPIO == file->pub.driver_id);
 
     FUNC_LEAVE_NOAPI(file->eof)
-}
+} /* end H5FD__mpio_get_eof() */
 
 
 /*-------------------------------------------------------------------------
- * Function:       H5FD_mpio_get_handle
+ * Function:       H5FD__mpio_get_handle
  *
  * Purpose:        Returns the file handle of MPIO file driver.
  *
@@ -1287,17 +1258,15 @@ H5FD_mpio_get_eof(const H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type)
  * Programmer:     Raymond Lu
  *                 Sept. 16, 2002
  *
- * Modifications:
- *
  *-------------------------------------------------------------------------
 */
 static herr_t
-H5FD_mpio_get_handle(H5FD_t *_file, hid_t H5_ATTR_UNUSED fapl, void** file_handle)
+H5FD__mpio_get_handle(H5FD_t *_file, hid_t H5_ATTR_UNUSED fapl, void** file_handle)
 {
-    H5FD_mpio_t         *file = (H5FD_mpio_t *)_file;
-    herr_t              ret_value = SUCCEED;
+    H5FD_mpio_t *file = (H5FD_mpio_t *)_file;
+    herr_t      ret_value = SUCCEED;
 
-    FUNC_ENTER_NOAPI_NOINIT
+    FUNC_ENTER_STATIC
 
     if(!file_handle)
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "file handle not valid")
@@ -1306,7 +1275,7 @@ H5FD_mpio_get_handle(H5FD_t *_file, hid_t H5_ATTR_UNUSED fapl, void** file_handl
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
-}
+} /* end H5FD__mpio_get_handle() */
 
 
 /*-------------------------------------------------------------------------
@@ -1343,7 +1312,7 @@ done:
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5FD_mpio_read
+ * Function:	H5FD__mpio_read
  *
  * Purpose:	Reads SIZE bytes of data from FILE beginning at address ADDR
  *		into buffer BUF according to data transfer properties in
@@ -1361,85 +1330,41 @@ done:
  *
  * Programmer:	rky, 1998-01-30
  *
- * Modifications:
- * 		Robb Matzke, 1998-02-18
- *		Added the ACCESS_PARMS argument.
- *
- * 		rky, 1998-04-10
- *		Call independent or collective MPI read, based on
- *		ACCESS_PARMS.
- *
- * 		Albert Cheng, 1998-06-01
- *		Added XFER_MODE to control independent or collective MPI
- *		read.
- *
- * 		rky, 1998-08-16
- *		Use BTYPE, FTYPE, and DISP from access parms. The guts of
- *		H5FD_mpio_read and H5FD_mpio_write should be replaced by a
- *		single dual-purpose routine.
- *
- * 		Robb Matzke, 1999-04-21
- *		Changed XFER_MODE to XFER_PARMS for all H5F_*_read()
- *		callbacks.
- *
- * 		Robb Matzke, 1999-07-28
- *		The ADDR argument is passed by value.
- *
- * 		Robb Matzke, 1999-08-06
- *		Modified to work with the virtual file layer.
- *
- *		Quincey Koziol,  2002-05-14
- *		Only call MPI_Get_count if we can use MPI_BYTE for the MPI type
- *              for the I/O transfer.  Someday we might include code to decode
- *              the MPI type used for more complicated transfers and call
- *              MPI_Get_count all the time.
- *
- *              Quincey Koziol - 2002/06/17
- *              Removed 'disp' parameter from H5FD_mpio_setup routine and use
- *              the address of the dataset in MPI_File_set_view() calls, as
- *              necessary.
- *
- *              Quincey Koziol - 2002/06/24
- *              Removed "lazy" MPI_File_set_view() calls, since they would fail
- *              if the first I/O was a collective I/O using MPI derived types
- *              and the next I/O was an independent I/O.
- *
- *              Quincey Koziol - 2003/10/22-31
- *              Restructured code massively, straightening out logic and finally
- *              getting the bytes_read stuff working.
- *
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5FD_mpio_read(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type,
+H5FD__mpio_read(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type,
     hid_t H5_ATTR_UNUSED dxpl_id, haddr_t addr, size_t size, void *buf/*out*/)
 {
-    H5FD_mpio_t			*file = (H5FD_mpio_t*)_file;
-    MPI_Offset			mpi_off;
-    MPI_Status  		mpi_stat;       /* Status from I/O operation */
-    int				mpi_code;	/* mpi return code */
-    MPI_Datatype		buf_type = MPI_BYTE;      /* MPI description of the selection in memory */
-    int         		size_i;         /* Integer copy of 'size' to read */
+    H5FD_mpio_t *file = (H5FD_mpio_t*)_file;
+    MPI_Offset  mpi_off;
+    MPI_Status  mpi_stat;       /* Status from I/O operation */
+    int         mpi_code;       /* mpi return code */
+    MPI_Datatype buf_type = MPI_BYTE;      /* MPI description of the selection in memory */
+    int         size_i;         /* Integer copy of 'size' to read */
 #if MPI_VERSION >= 3
-    MPI_Count         		bytes_read;     /* Number of bytes read in */
-    MPI_Count                   type_size;      /* MPI datatype used for I/O's size */
-    MPI_Count                   io_size;        /* Actual number of bytes requested */
-    MPI_Count                   n;
+    MPI_Count   bytes_read = 0; /* Number of bytes read in */
+    MPI_Count   type_size;      /* MPI datatype used for I/O's size */
+    MPI_Count   io_size;        /* Actual number of bytes requested */
+    MPI_Count   n;
 #else
-    int                         bytes_read;     /* Number of bytes read in */
-    int                         type_size;      /* MPI datatype used for I/O's size */
-    int                         io_size;        /* Actual number of bytes requested */
-    int         		n;
+    int         bytes_read = 0; /* Number of bytes read in */
+    int         type_size;      /* MPI datatype used for I/O's size */
+    int         io_size;        /* Actual number of bytes requested */
+    int         n;
 #endif
-    hbool_t			use_view_this_time = FALSE;
-    herr_t              	ret_value = SUCCEED;
+    hbool_t     use_view_this_time = FALSE;
+    hbool_t     rank0_bcast = FALSE; /* If read-with-rank0-and-bcast flag was used */
+    herr_t      ret_value = SUCCEED;
 
-    FUNC_ENTER_NOAPI_NOINIT
+    FUNC_ENTER_STATIC
 
 #ifdef H5FDmpio_DEBUG
-    if (H5FD_mpio_Debug[(int)'t'])
-    	fprintf(stdout, "Entering H5FD_mpio_read\n" );
+    if(H5FD_mpio_Debug[(int)'t'])
+        HDfprintf(stdout, "%s: Entering\n", FUNC);
 #endif
+
+    /* Sanity checks */
     HDassert(file);
     HDassert(H5FD_MPIO==file->pub.driver_id);
     HDassert(buf);
@@ -1448,21 +1373,20 @@ H5FD_mpio_read(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type,
     HDmemset(&mpi_stat,0,sizeof(MPI_Status));
 
     /* some numeric conversions */
-    if (H5FD_mpi_haddr_to_MPIOff(addr, &mpi_off/*out*/)<0)
+    if(H5FD_mpi_haddr_to_MPIOff(addr, &mpi_off/*out*/) < 0)
         HGOTO_ERROR(H5E_INTERNAL, H5E_BADRANGE, FAIL, "can't convert from haddr to MPI off")
     size_i = (int)size;
-    if ((hsize_t)size_i != size)
+    if((hsize_t)size_i != size)
         HGOTO_ERROR(H5E_INTERNAL, H5E_BADRANGE, FAIL, "can't convert from size to size_i")
 
 #ifdef H5FDmpio_DEBUG
-    if (H5FD_mpio_Debug[(int)'r'])
-        fprintf(stdout, "in H5FD_mpio_read  mpi_off=%ld  size_i=%d\n",
-		(long)mpi_off, size_i );
+    if(H5FD_mpio_Debug[(int)'r'])
+        HDfprintf(stdout, "%s: mpi_off = %ld  size_i = %d\n", FUNC, (long)mpi_off, size_i);
 #endif
 
     /* Only look for MPI views for raw data transfers */
     if(type == H5FD_MEM_DRAW) {
-        H5FD_mpio_xfer_t            xfer_mode;   /* I/O transfer mode */
+        H5FD_mpio_xfer_t xfer_mode;   /* I/O transfer mode */
 
         /* Get the transfer mode from the API context */
         if(H5CX_get_io_xfer_mode(&xfer_mode) < 0)
@@ -1474,8 +1398,8 @@ H5FD_mpio_read(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type,
          * us to test that btype=ftype=MPI_BYTE (or even MPI_TYPE_NULL, which
          * could mean "use MPI_BYTE" by convention).
          */
-        if(xfer_mode==H5FD_MPIO_COLLECTIVE) {
-            MPI_Datatype		file_type;
+        if(xfer_mode == H5FD_MPIO_COLLECTIVE) {
+            MPI_Datatype file_type;
 
             /* Remember that views are used */
             use_view_this_time = TRUE;
@@ -1502,8 +1426,8 @@ H5FD_mpio_read(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type,
         H5FD_mpio_collective_opt_t coll_opt_mode;
 
 #ifdef H5FDmpio_DEBUG
-	if (H5FD_mpio_Debug[(int)'t'])
-	    fprintf(stdout, "H5FD_mpio_read: using MPIO collective mode\n");
+        if(H5FD_mpio_Debug[(int)'r'])
+            HDfprintf(stdout, "%s: using MPIO collective mode\n", FUNC);
 #endif
         /* Get the collective_opt property to check whether the application wants to do IO individually. */
         if(H5CX_get_mpio_coll_opt(&coll_opt_mode) < 0)
@@ -1511,16 +1435,33 @@ H5FD_mpio_read(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type,
 
         if(coll_opt_mode == H5FD_MPIO_COLLECTIVE_IO) {
 #ifdef H5FDmpio_DEBUG
-            if(H5FD_mpio_Debug[(int)'t'])
-                fprintf(stdout, "H5FD_mpio_read: doing MPI collective IO\n");
+            if(H5FD_mpio_Debug[(int)'r'])
+                HDfprintf(stdout, "%s: doing MPI collective IO\n", FUNC);
 #endif
-            if(MPI_SUCCESS != (mpi_code = MPI_File_read_at_all(file->f, mpi_off, buf, size_i, buf_type, &mpi_stat)))
-                HMPI_GOTO_ERROR(FAIL, "MPI_File_read_at_all failed", mpi_code)
+            /* Check whether we should read from rank 0 and broadcast to other ranks */
+            if(H5CX_get_mpio_rank0_bcast()) {
+#ifdef H5FDmpio_DEBUG
+                if(H5FD_mpio_Debug[(int)'r'])
+                    HDfprintf(stdout, "%s: doing read-rank0-and-MPI_Bcast\n", FUNC);
+#endif
+                /* Indicate path we've taken */
+                rank0_bcast = TRUE;
+
+                /* Read on rank 0 Bcast to other ranks */
+                if(file->mpi_rank == 0)
+                    if(MPI_SUCCESS != (mpi_code = MPI_File_read_at(file->f, mpi_off, buf, size_i, buf_type, &mpi_stat)))
+                        HMPI_GOTO_ERROR(FAIL, "MPI_File_read_at failed", mpi_code)
+                if(MPI_SUCCESS != (mpi_code = MPI_Bcast(buf, size_i, buf_type, 0, file->comm)))
+                    HMPI_GOTO_ERROR(FAIL, "MPI_Bcast failed", mpi_code)
+            } /* end if */
+            else
+                if(MPI_SUCCESS != (mpi_code = MPI_File_read_at_all(file->f, mpi_off, buf, size_i, buf_type, &mpi_stat)))
+                    HMPI_GOTO_ERROR(FAIL, "MPI_File_read_at_all failed", mpi_code)
         } /* end if */
         else {
 #ifdef H5FDmpio_DEBUG
-            if(H5FD_mpio_Debug[(int)'t'])
-                fprintf(stdout, "H5FD_mpio_read: doing MPI independent IO\n");
+            if(H5FD_mpio_Debug[(int)'r'])
+                HDfprintf(stdout, "%s: doing MPI independent IO\n", FUNC);
 #endif
 
             if(MPI_SUCCESS != (mpi_code = MPI_File_read_at(file->f, mpi_off, buf, size_i, buf_type, &mpi_stat)))
@@ -1532,52 +1473,65 @@ H5FD_mpio_read(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type,
          */
         if(MPI_SUCCESS != (mpi_code = MPI_File_set_view(file->f, (MPI_Offset)0, MPI_BYTE, MPI_BYTE, H5FD_mpi_native_g, file->info)))
             HMPI_GOTO_ERROR(FAIL, "MPI_File_set_view failed", mpi_code)
-    } else {
+    } /* end if */
+    else
         if(MPI_SUCCESS != (mpi_code = MPI_File_read_at(file->f, mpi_off, buf, size_i, buf_type, &mpi_stat)))
             HMPI_GOTO_ERROR(FAIL, "MPI_File_read_at failed", mpi_code)
-    }
 
-    /* How many bytes were actually read? */
+    /* Only retrieve bytes read if this rank _actually_ participated in I/O */
+    if(!rank0_bcast || (rank0_bcast && file->mpi_rank == 0) ) {
+        /* How many bytes were actually read? */
 #if MPI_VERSION >= 3
-    if (MPI_SUCCESS != (mpi_code = MPI_Get_elements_x(&mpi_stat, buf_type, &bytes_read)))
+        if(MPI_SUCCESS != (mpi_code = MPI_Get_elements_x(&mpi_stat, buf_type, &bytes_read)))
 #else
-    if (MPI_SUCCESS != (mpi_code = MPI_Get_elements(&mpi_stat, MPI_BYTE, &bytes_read)))
+        if(MPI_SUCCESS != (mpi_code = MPI_Get_elements(&mpi_stat, MPI_BYTE, &bytes_read)))
 #endif
-        HMPI_GOTO_ERROR(FAIL, "MPI_Get_elements failed", mpi_code)
+            HMPI_GOTO_ERROR(FAIL, "MPI_Get_elements failed", mpi_code)
+    } /* end if */
+ 
+    /* If the rank0-bcast feature was used, broadcast the # of bytes read to
+     * other ranks, which didn't perform any I/O.
+     */
+    /* NOTE: This could be optimized further to be combined with the broadcast
+     *          of the data.  (QAK - 2019/1/2)
+     */
+    if(rank0_bcast)
+        if(MPI_SUCCESS != MPI_Bcast(&bytes_read, 1, MPI_LONG_LONG, 0, file->comm))
+            HMPI_GOTO_ERROR(FAIL, "MPI_Bcast failed", 0)
 
     /* Get the type's size */
 #if MPI_VERSION >= 3
-    if (MPI_SUCCESS != (mpi_code = MPI_Type_size_x(buf_type, &type_size)))
+    if(MPI_SUCCESS != (mpi_code = MPI_Type_size_x(buf_type, &type_size)))
 #else
-    if (MPI_SUCCESS != (mpi_code = MPI_Type_size(buf_type, &type_size)))
+    if(MPI_SUCCESS != (mpi_code = MPI_Type_size(buf_type, &type_size)))
 #endif
         HMPI_GOTO_ERROR(FAIL, "MPI_Type_size failed", mpi_code)
 
     /* Compute the actual number of bytes requested */
-    io_size=type_size*size_i;
+    io_size = type_size * size_i;
 
     /* Check for read failure */
-    if (bytes_read<0 || bytes_read>io_size)
+    if(bytes_read < 0 || bytes_read > io_size)
         HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "file read failed")
 
     /*
      * This gives us zeroes beyond end of physical MPI file.
      */
-    if ((n=(io_size-bytes_read)) > 0)
+    if((n = (io_size - bytes_read)) > 0)
         HDmemset((char*)buf+bytes_read, 0, (size_t)n);
 
 done:
 #ifdef H5FDmpio_DEBUG
-    if (H5FD_mpio_Debug[(int)'t'])
-    	fprintf(stdout, "Leaving H5FD_mpio_read\n" );
+    if(H5FD_mpio_Debug[(int)'t'])
+       HDfprintf(stdout, "%s: Leaving\n", FUNC);
 #endif
 
     FUNC_LEAVE_NOAPI(ret_value)
-}
+} /* end H5FD__mpio_read() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5FD_mpio_write
+ * Function:	H5FD__mpio_write
  *
  * Purpose:	Writes SIZE bytes of data to FILE beginning at address ADDR
  *		from buffer BUF according to data transfer properties in
@@ -1589,116 +1543,16 @@ done:
  *
  * Return:	Success:	Zero. USE_TYPES and OLD_USE_TYPES in the
  *				access params are altered.
- *
  *		Failure:	-1, USE_TYPES and OLD_USE_TYPES in the
  *				access params may be altered.
  *
- * Programmer:	Unknown
+ * Programmer:	Robert Kim Yates
  *              January 30, 1998
  *
- * Modifications:
- *		rky, 1998-08-28
- *		If the file->allsame flag is set, we assume that all the
- *		procs in the relevant MPI communicator will write identical
- *		data at identical offsets in the file, so only proc 0 will
- *		write, and all other procs will wait for p0 to finish. This
- *		is useful for writing metadata, for example. Note that we
- *		don't _check_ that the data is identical. Also, the mechanism
- *		we use to eliminate the redundant writes is by requiring a
- *		call to H5FD_mpio_tas_allsame before the write, which is
- *		rather klugey. Would it be better to pass a parameter to
- *		low-level writes like H5F_block_write and H5F_low_write,
- *		instead?  Or...??? Also, when I created this mechanism I
- *		wanted to minimize the difference in behavior between the old
- *		way of doing things (i.e., all procs write) and the new way,
- *		so the writes are eliminated at the very lowest level, here
- *		in H5FD_mpio_write. It may be better to rethink that, and
- *		short-circuit the writes at a higher level (e.g., at the
- *		points in the code where H5FD_mpio_tas_allsame is called).
- *
- *
- * 		Robb Matzke, 1998-02-18
- *		Added the ACCESS_PARMS argument.
- *
- * 		rky, 1998-04-10
- *		Call independent or collective MPI write, based on
- *		ACCESS_PARMS.
- *
- * 		rky, 1998-04-24
- *		Removed redundant write from H5FD_mpio_write.
- *
- * 		Albert Cheng, 1998-06-01
- *		Added XFER_MODE to control independent or collective MPI
- *		write.
- *
- * 		rky, 1998-08-16
- *		Use BTYPE, FTYPE, and DISP from access parms. The guts of
- *		H5FD_mpio_read and H5FD_mpio_write should be replaced by a
- *		single dual-purpose routine.
- *
- * 		rky, 1998-08-28
- *		Added ALLSAME parameter to make all but proc 0 skip the
- *		actual write.
- *
- * 		Robb Matzke, 1999-04-21
- *		Changed XFER_MODE to XFER_PARMS for all H5FD_*_write()
- *		callbacks.
- *
- * 		Robb Matzke, 1999-07-28
- *		The ADDR argument is passed by value.
- *
- * 		Robb Matzke, 1999-08-06
- *		Modified to work with the virtual file layer.
- *
- *		Albert Cheng, 1999-12-19
- *		When only-p0-write-allsame-data, p0 Bcasts the
- *		ret_value to other processes.  This prevents
- *		a racing condition (that other processes try to
- *		read the file before p0 finishes writing) and also
- *		allows all processes to report the same ret_value.
- *
- *		Kim Yates, Pat Weidhaas,  2000-09-26
- *		Move block of coding where only p0 writes after the
- *              MPI_File_set_view call.
- *
- *		Quincey Koziol,  2002-05-10
- *		Instead of always writing metadata from process 0, spread the
- *              burden among all the processes by using a round-robin rotation
- *              scheme.
- *
- *		Quincey Koziol,  2002-05-10
- *		Removed allsame code, keying off the type parameter instead.
- *
- *		Quincey Koziol,  2002-05-14
- *		Only call MPI_Get_count if we can use MPI_BYTE for the MPI type
- *              for the I/O transfer.  Someday we might include code to decode
- *              the MPI type used for more complicated transfers and call
- *              MPI_Get_count all the time.
- *
- *              Quincey Koziol - 2002/06/17
- *              Removed 'disp' parameter from H5FD_mpio_setup routine and use
- *              the address of the dataset in MPI_File_set_view() calls, as
- *              necessary.
- *
- *              Quincey Koziol - 2002/06/24
- *              Removed "lazy" MPI_File_set_view() calls, since they would fail
- *              if the first I/O was a collective I/O using MPI derived types
- *              and the next I/O was an independent I/O.
- *
- *              Quincey Koziol - 2002/07/18
- *              Added "block_before_meta_write" dataset transfer flag, which
- *              is set during writes from a metadata cache flush and indicates
- *              that all the processes must sync up before (one of them)
- *              writing metadata.
- *
- *              Quincey Koziol - 2003/10/22-31
- *              Restructured code massively, straightening out logic and finally
- *              getting the bytes_written stuff working.
- *
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5FD_mpio_write(H5FD_t *_file, H5FD_mem_t type, hid_t H5_ATTR_UNUSED dxpl_id,
+H5FD__mpio_write(H5FD_t *_file, H5FD_mem_t type, hid_t H5_ATTR_UNUSED dxpl_id,
     haddr_t addr, size_t size, const void *buf)
 {
     H5FD_mpio_t			*file = (H5FD_mpio_t*)_file;
@@ -1720,12 +1574,14 @@ H5FD_mpio_write(H5FD_t *_file, H5FD_mem_t type, hid_t H5_ATTR_UNUSED dxpl_id,
     H5FD_mpio_xfer_t            xfer_mode;   /* I/O transfer mode */
     herr_t              	ret_value = SUCCEED;
 
-    FUNC_ENTER_NOAPI_NOINIT
+    FUNC_ENTER_STATIC
 
 #ifdef H5FDmpio_DEBUG
-    if (H5FD_mpio_Debug[(int)'t'])
-    	fprintf(stdout, "Entering H5FD_mpio_write\n" );
+    if(H5FD_mpio_Debug[(int)'t'])
+    	HDfprintf(stdout, "%s: Entering\n", FUNC);
 #endif
+
+    /* Sanity checks */
     HDassert(file);
     HDassert(H5FD_MPIO==file->pub.driver_id);
     HDassert(buf);
@@ -1745,7 +1601,7 @@ H5FD_mpio_write(H5FD_t *_file, H5FD_mem_t type, hid_t H5_ATTR_UNUSED dxpl_id,
 
 #ifdef H5FDmpio_DEBUG
     if(H5FD_mpio_Debug[(int)'w'])
-        fprintf(stdout, "in H5FD_mpio_write  mpi_off=%ld  size_i=%d\n", (long)mpi_off, size_i);
+        HDfprintf(stdout, "%s: mpi_off = %ld  size_i = %d\n", FUNC, (long)mpi_off, size_i);
 #endif
 
     /* Get the transfer mode from the API context */
@@ -1785,8 +1641,8 @@ H5FD_mpio_write(H5FD_t *_file, H5FD_mem_t type, hid_t H5_ATTR_UNUSED dxpl_id,
         H5FD_mpio_collective_opt_t coll_opt_mode;
 
 #ifdef H5FDmpio_DEBUG
-        if(H5FD_mpio_Debug[(int)'t'])
-            fprintf(stdout, "H5FD_mpio_write: using MPIO collective mode\n");
+        if(H5FD_mpio_Debug[(int)'w'])
+            HDfprintf(stdout, "%s: using MPIO collective mode\n", FUNC);
 #endif
 
         /* Get the collective_opt property to check whether the application wants to do IO individually. */
@@ -1795,8 +1651,8 @@ H5FD_mpio_write(H5FD_t *_file, H5FD_mem_t type, hid_t H5_ATTR_UNUSED dxpl_id,
 
         if(coll_opt_mode == H5FD_MPIO_COLLECTIVE_IO) {
 #ifdef H5FDmpio_DEBUG
-            if(H5FD_mpio_Debug[(int)'t'])
-                fprintf(stdout, "H5FD_mpio_write: doing MPI collective IO\n");
+            if(H5FD_mpio_Debug[(int)'w'])
+                HDfprintf(stdout, "%s: doing MPI collective IO\n", FUNC);
 #endif
             if(MPI_SUCCESS != (mpi_code = MPI_File_write_at_all(file->f, mpi_off, buf, size_i, buf_type, &mpi_stat)))
                 HMPI_GOTO_ERROR(FAIL, "MPI_File_write_at_all failed", mpi_code)
@@ -1805,8 +1661,8 @@ H5FD_mpio_write(H5FD_t *_file, H5FD_mem_t type, hid_t H5_ATTR_UNUSED dxpl_id,
             if(type != H5FD_MEM_DRAW)
                 HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "Metadata Coll opt property should be collective at this point")
 #ifdef H5FDmpio_DEBUG
-            if(H5FD_mpio_Debug[(int)'t'])
-                fprintf(stdout, "H5FD_mpio_write: doing MPI independent IO\n");
+            if(H5FD_mpio_Debug[(int)'w'])
+                HDfprintf(stdout, "%s: doing MPI independent IO\n", FUNC);
 #endif
             if(MPI_SUCCESS != (mpi_code = MPI_File_write_at(file->f, mpi_off, buf, size_i, buf_type, &mpi_stat)))
                 HMPI_GOTO_ERROR(FAIL, "MPI_File_write_at failed", mpi_code)
@@ -1815,10 +1671,10 @@ H5FD_mpio_write(H5FD_t *_file, H5FD_mem_t type, hid_t H5_ATTR_UNUSED dxpl_id,
         /* Reset the file view when we used MPI derived types */
         if(MPI_SUCCESS != (mpi_code = MPI_File_set_view(file->f, (MPI_Offset)0, MPI_BYTE, MPI_BYTE, H5FD_mpi_native_g,  file->info)))
             HMPI_GOTO_ERROR(FAIL, "MPI_File_set_view failed", mpi_code)
-    } else {
+    } /* end if */
+    else
         if(MPI_SUCCESS != (mpi_code = MPI_File_write_at(file->f, mpi_off, buf, size_i, buf_type, &mpi_stat)))
             HMPI_GOTO_ERROR(FAIL, "MPI_File_write_at failed", mpi_code)
-    }
 
     /* How many bytes were actually written? */
 #if MPI_VERSION >= 3
@@ -1857,15 +1713,15 @@ H5FD_mpio_write(H5FD_t *_file, H5FD_mem_t type, hid_t H5_ATTR_UNUSED dxpl_id,
 done:
 #ifdef H5FDmpio_DEBUG
     if(H5FD_mpio_Debug[(int)'t'])
-    	fprintf(stdout, "proc %d: Leaving H5FD_mpio_write with ret_value=%d\n",
-	    file->mpi_rank, ret_value );
+    	HDfprintf(stdout, "%s: Leaving, proc %d: ret_value = %d\n", FUNC, file->mpi_rank, ret_value );
 #endif
+
     FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5FD_mpio_write() */
+} /* end H5FD__mpio_write() */
 
 
 /*-------------------------------------------------------------------------
- * Function:    H5FD_mpio_flush
+ * Function:    H5FD__mpio_flush
  *
  * Purpose:     Makes sure that all data is on disk.  This is collective.
  *
@@ -1879,18 +1735,20 @@ done:
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5FD_mpio_flush(H5FD_t *_file, hid_t H5_ATTR_UNUSED dxpl_id, hbool_t closing)
+H5FD__mpio_flush(H5FD_t *_file, hid_t H5_ATTR_UNUSED dxpl_id, hbool_t closing)
 {
     H5FD_mpio_t		*file = (H5FD_mpio_t*)_file;
     int			mpi_code;	/* mpi return code */
     herr_t              ret_value = SUCCEED;
 
-    FUNC_ENTER_NOAPI_NOINIT
+    FUNC_ENTER_STATIC
 
 #ifdef H5FDmpio_DEBUG
     if(H5FD_mpio_Debug[(int)'t'])
-    	HDfprintf(stdout, "Entering %s\n", FUNC);
+    	HDfprintf(stdout, "%s: Entering\n", FUNC);
 #endif
+
+    /* Sanity checks */
     HDassert(file);
     HDassert(H5FD_MPIO == file->pub.driver_id);
 
@@ -1902,15 +1760,15 @@ H5FD_mpio_flush(H5FD_t *_file, hid_t H5_ATTR_UNUSED dxpl_id, hbool_t closing)
 done:
 #ifdef H5FDmpio_DEBUG
     if(H5FD_mpio_Debug[(int)'t'])
-    	HDfprintf(stdout, "Leaving %s\n", FUNC);
+    	HDfprintf(stdout, "%s: Leaving\n", FUNC);
 #endif
 
     FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5FD_mpio_flush() */
+} /* end H5FD__mpio_flush() */
 
 
 /*-------------------------------------------------------------------------
- * Function:    H5FD_mpio_truncate
+ * Function:    H5FD__mpio_truncate
  *
  * Purpose:     Make certain the file's size matches it's allocated size
  *
@@ -1930,31 +1788,22 @@ done:
  * Programmer:  Quincey Koziol
  *              January 31, 2008
  *
- * Changes:     Heavily reworked to avoid unnecessary MPI_File_set_size()
- *              calls.  The hope is that these calls are superfluous in the
- *              typical case, allowing us to avoid truncates most of the 
- *              time.
- *
- *              The basic idea is to query the file system to get the 
- *              current eof, and only truncate if the file systems 
- *              conception of the eof disagrees with our eoa.
- *
- *                                                 JRM -- 10/27/17
- *
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5FD_mpio_truncate(H5FD_t *_file, hid_t H5_ATTR_UNUSED dxpl_id, hbool_t H5_ATTR_UNUSED closing)
+H5FD__mpio_truncate(H5FD_t *_file, hid_t H5_ATTR_UNUSED dxpl_id, hbool_t H5_ATTR_UNUSED closing)
 {
-    H5FD_mpio_t		*file = (H5FD_mpio_t*)_file;
-    herr_t              ret_value = SUCCEED;
+    H5FD_mpio_t	*file = (H5FD_mpio_t*)_file;
+    herr_t      ret_value = SUCCEED;
 
-    FUNC_ENTER_NOAPI_NOINIT
+    FUNC_ENTER_STATIC
 
 #ifdef H5FDmpio_DEBUG
     if(H5FD_mpio_Debug[(int)'t'])
-    	HDfprintf(stdout, "Entering %s\n", FUNC);
+    	HDfprintf(stdout, "%s: Entering\n", FUNC);
 #endif
+
+    /* Sanity checks */
     HDassert(file);
     HDassert(H5FD_MPIO == file->pub.driver_id);
 
@@ -2020,15 +1869,15 @@ H5FD_mpio_truncate(H5FD_t *_file, hid_t H5_ATTR_UNUSED dxpl_id, hbool_t H5_ATTR_
 done:
 #ifdef H5FDmpio_DEBUG
     if(H5FD_mpio_Debug[(int)'t'])
-    	HDfprintf(stdout, "Leaving %s\n", FUNC);
+    	HDfprintf(stdout, "%s: Leaving\n", FUNC);
 #endif
 
     FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5FD_mpio_truncate() */
+} /* end H5FD__mpio_truncate() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5FD_mpio_mpi_rank
+ * Function:	H5FD__mpio_mpi_rank
  *
  * Purpose:	Returns the MPI rank for a process
  *
@@ -2038,26 +1887,25 @@ done:
  * Programmer:	Quincey Koziol
  *              Thursday, May 16, 2002
  *
- * Modifications:
- *
  *-------------------------------------------------------------------------
  */
 static int
-H5FD_mpio_mpi_rank(const H5FD_t *_file)
+H5FD__mpio_mpi_rank(const H5FD_t *_file)
 {
     const H5FD_mpio_t	*file = (const H5FD_mpio_t*)_file;
 
-    FUNC_ENTER_NOAPI_NOINIT_NOERR
+    FUNC_ENTER_STATIC
 
+    /* Sanity checks */
     HDassert(file);
-    HDassert(H5FD_MPIO==file->pub.driver_id);
+    HDassert(H5FD_MPIO == file->pub.driver_id);
 
     FUNC_LEAVE_NOAPI(file->mpi_rank)
-} /* end H5FD_mpio_mpi_rank() */
+} /* end H5FD__mpio_mpi_rank() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5FD_mpio_mpi_size
+ * Function:	H5FD__mpio_mpi_size
  *
  * Purpose:	Returns the number of MPI processes
  *
@@ -2067,26 +1915,25 @@ H5FD_mpio_mpi_rank(const H5FD_t *_file)
  * Programmer:	Quincey Koziol
  *              Thursday, May 16, 2002
  *
- * Modifications:
- *
  *-------------------------------------------------------------------------
  */
 static int
-H5FD_mpio_mpi_size(const H5FD_t *_file)
+H5FD__mpio_mpi_size(const H5FD_t *_file)
 {
     const H5FD_mpio_t	*file = (const H5FD_mpio_t*)_file;
 
-    FUNC_ENTER_NOAPI_NOINIT_NOERR
+    FUNC_ENTER_STATIC
 
+    /* Sanity checks */
     HDassert(file);
-    HDassert(H5FD_MPIO==file->pub.driver_id);
+    HDassert(H5FD_MPIO == file->pub.driver_id);
 
     FUNC_LEAVE_NOAPI(file->mpi_size)
-} /* end H5FD_mpio_mpi_size() */
+} /* end H5FD__mpio_mpi_size() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5FD_mpio_communicator
+ * Function:	H5FD__mpio_communicator
  *
  * Purpose:	Returns the MPI communicator for the file.
  *
@@ -2097,22 +1944,53 @@ H5FD_mpio_mpi_size(const H5FD_t *_file)
  * Programmer:	Robb Matzke
  *              Monday, August  9, 1999
  *
- * Modifications:
- *
  *-------------------------------------------------------------------------
  */
 static MPI_Comm
-H5FD_mpio_communicator(const H5FD_t *_file)
+H5FD__mpio_communicator(const H5FD_t *_file)
 {
     const H5FD_mpio_t	*file = (const H5FD_mpio_t*)_file;
 
-    FUNC_ENTER_NOAPI_NOINIT_NOERR
+    FUNC_ENTER_STATIC
 
+    /* Sanity checks */
     HDassert(file);
-    HDassert(H5FD_MPIO==file->pub.driver_id);
+    HDassert(H5FD_MPIO == file->pub.driver_id);
 
     FUNC_LEAVE_NOAPI(file->comm)
-} /* end H5FD_mpio_communicator() */
+} /* end H5FD__mpio_communicator() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:       H5FD__mpio_get_info
+ *
+ * Purpose:        Returns the file info of MPIO file driver.
+ *
+ * Returns:        Non-negative if succeed or negative if fails.
+ *
+ * Programmer:     John Mainzer
+ *                 April 4, 2017
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+*/
+static herr_t
+H5FD__mpio_get_info(H5FD_t *_file, void **mpi_info)
+{
+    H5FD_mpio_t *file = (H5FD_mpio_t *)_file;
+    herr_t      ret_value = SUCCEED;
+
+    FUNC_ENTER_STATIC
+
+    if(!mpi_info)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "mpi info not valid")
+
+    *mpi_info = &(file->info);
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5FD__mpio_get_info() */
 
 #endif /* H5_HAVE_PARALLEL */
 
diff --git a/src/H5FDmulti.c b/src/H5FDmulti.c
index aa1b118..fac0909 100644
--- a/src/H5FDmulti.c
+++ b/src/H5FDmulti.c
@@ -26,11 +26,6 @@
 #include <stdlib.h>
 #include <string.h>
 
-/* Disable certain warnings in PC-Lint: */
-/*lint --emacro( {534, 830}, H5P_DEFAULT, H5P_FILE_ACCESS, H5P_DATASET_XFER) */
-/*lint --emacro( {534, 830}, H5FD_MULTI) */
-/*lint -esym( 534, H5Eclear2, H5Epush2) */
-
 #include "hdf5.h"
 
 
@@ -211,16 +206,15 @@ my_strdup(const char *s)
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5FD_multi_init
- *
- * Purpose:	Initialize this driver by registering the driver with the
- *		library.
+ * Function:    H5FD_multi_init
  *
- * Return:	Success:	The driver ID for the multi driver.
+ * Purpose:     Initialize this driver by registering the driver with the
+ *              library.
  *
- *		Failure:	Negative
+ * Return:      Success:    The driver ID for the multi driver
+ *              Failure:    H5I_INVALID_HID
  *
- * Programmer:	Robb Matzke
+ * Programmer:  Robb Matzke
  *              Wednesday, August  4, 1999
  *
  *-------------------------------------------------------------------------
@@ -231,11 +225,11 @@ H5FD_multi_init(void)
     /* Clear the error stack */
     H5Eclear2(H5E_DEFAULT);
 
-    if(H5I_VFL!=H5Iget_type(H5FD_MULTI_g))
+    if(H5I_VFL != H5Iget_type(H5FD_MULTI_g))
         H5FD_MULTI_g = H5FDregister(&H5FD_multi_g);
 
     return H5FD_MULTI_g;
-}
+} /* end H5FD_multi_init() */
 
 
 /*---------------------------------------------------------------------------
@@ -497,6 +491,7 @@ H5Pset_fapl_multi(hid_t fapl_id, const H5FD_mem_t *memb_map,
      * Initialize driver specific information. No need to copy it into the FA
      * struct since all members will be copied by H5Pset_driver().
      */
+    memset(&fa, 0, sizeof(H5FD_multi_fapl_t));
     memcpy(fa.memb_map, memb_map, H5FD_MEM_NTYPES*sizeof(H5FD_mem_t));
     memcpy(fa.memb_fapl, memb_fapl, H5FD_MEM_NTYPES*sizeof(hid_t));
     memcpy(fa.memb_name, memb_name, H5FD_MEM_NTYPES*sizeof(char*));
@@ -892,7 +887,7 @@ static void *
 H5FD_multi_fapl_copy(const void *_old_fa)
 {
     const H5FD_multi_fapl_t *old_fa = (const H5FD_multi_fapl_t*)_old_fa;
-    H5FD_multi_fapl_t *new_fa = (H5FD_multi_fapl_t *)malloc(sizeof(H5FD_multi_fapl_t));
+    H5FD_multi_fapl_t *new_fa = (H5FD_multi_fapl_t *)calloc(1, sizeof(H5FD_multi_fapl_t));
     int nerrors = 0;
     static const char *func="H5FD_multi_fapl_copy";  /* Function Name for error reporting */
 
diff --git a/src/H5FDsec2.c b/src/H5FDsec2.c
index 06c008d..c507387 100644
--- a/src/H5FDsec2.c
+++ b/src/H5FDsec2.c
@@ -208,8 +208,8 @@ done:
  * Purpose:     Initialize this driver by registering the driver with the
  *              library.
  *
- * Return:      Success:    The driver ID for the sec2 driver.
- *              Failure:    Negative
+ * Return:      Success:    The driver ID for the sec2 driver
+ *              Failure:    H5I_INVALID_HID
  *
  * Programmer:  Robb Matzke
  *              Thursday, July 29, 1999
@@ -221,7 +221,7 @@ H5FD_sec2_init(void)
 {
     hid_t ret_value = H5I_INVALID_HID;          /* Return value */
 
-    FUNC_ENTER_NOAPI(FAIL)
+    FUNC_ENTER_NOAPI(H5I_INVALID_HID)
 
     if(H5I_VFL != H5I_get_type(H5FD_SEC2_g))
         H5FD_SEC2_g = H5FD_register(&H5FD_sec2_g, sizeof(H5FD_class_t), FALSE);
diff --git a/src/H5Fdeprec.c b/src/H5Fdeprec.c
index dfc1441..18e915f 100644
--- a/src/H5Fdeprec.c
+++ b/src/H5Fdeprec.c
@@ -42,6 +42,8 @@
 #include "H5Iprivate.h"         /* IDs                                      */
 #include "H5SMprivate.h"        /* Shared object header messages            */
 
+#include "H5VLnative_private.h" /* Native VOL connector                     */
+
 
 /****************/
 /* Local Macros */
@@ -118,7 +120,7 @@ H5Fget_info1(hid_t obj_id, H5F_info1_t *finfo)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid object identifier")
 
     /* Get the file information */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_GET_INFO, type, &finfo2) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_INFO, type, &finfo2) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to retrieve file info")
 
     /* Copy the compatible fields into the older struct */
@@ -225,7 +227,7 @@ H5Fset_latest_format(hid_t file_id, hbool_t latest_format)
         low = H5F_LIBVER_EARLIEST;
 
     /* Set the library's version bounds */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_SET_LIBVER_BOUNDS, low, high) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_SET_LIBVER_BOUNDS, (int)low, (int)high) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "can't set library version bounds")
 
 done:
diff --git a/src/H5Fefc.c b/src/H5Fefc.c
index a394071..f3881d4 100644
--- a/src/H5Fefc.c
+++ b/src/H5Fefc.c
@@ -29,8 +29,10 @@
 
 /* Packages needed by this file... */
 #include "H5private.h"          /* Generic Functions                    */
+#include "H5CXprivate.h"        /* API Contexts                         */
 #include "H5Eprivate.h"         /* Error handling                       */
 #include "H5Fpkg.h"             /* File access                          */
+#include "H5Iprivate.h"         /* IDs                                  */
 #include "H5MMprivate.h"        /* Memory management                    */
 #include "H5Pprivate.h"         /* Property lists                       */
 
@@ -144,6 +146,8 @@ H5F__efc_open(H5F_t *parent, const char *name, unsigned flags, hid_t fcpl_id, hi
     H5F_efc_t   *efc = NULL;    /* External file cache for parent file */
     H5F_efc_ent_t *ent = NULL;  /* Entry for target file in efc */
     hbool_t     open_file = FALSE; /* Whether ent->file needs to be closed in case of error */
+    H5P_genplist_t *plist;      /* Property list pointer for FAPL */
+    H5VL_connector_prop_t connector_prop; /* Property for VOL connector ID & info        */
     H5F_t       *ret_value = NULL; /* Return value */
 
     FUNC_ENTER_PACKAGE
@@ -153,6 +157,18 @@ H5F__efc_open(H5F_t *parent, const char *name, unsigned flags, hid_t fcpl_id, hi
     HDassert(parent->shared);
     HDassert(name);
 
+    /* Get the VOL info from the fapl */
+    if(NULL == (plist = (H5P_genplist_t *)H5I_object(fapl_id)))
+        HGOTO_ERROR(H5E_FILE, H5E_BADTYPE, NULL, "not a file access property list")
+    if(H5P_peek(plist, H5F_ACS_VOL_CONN_NAME, &connector_prop) < 0)
+        HGOTO_ERROR(H5E_FILE, H5E_CANTGET, NULL, "can't get VOL connector info")
+
+    /* Stash a copy of the "top-level" connector property, before any pass-through
+     *  connectors modify or unwrap it.
+     */
+    if(H5CX_set_vol_connector_prop(&connector_prop) < 0)
+        HGOTO_ERROR(H5E_FILE, H5E_CANTSET, NULL, "can't set VOL connector info in API context")
+
     /* Get external file cache */
     efc = parent->shared->efc;
 
diff --git a/src/H5Fint.c b/src/H5Fint.c
index 056a98b..8a7019d 100644
--- a/src/H5Fint.c
+++ b/src/H5Fint.c
@@ -39,6 +39,8 @@
 #include "H5Tprivate.h"         /* Datatypes                                */
 #include "H5VLprivate.h"        /* Virtual Object Layer                     */
 
+#include "H5VLnative_private.h" /* Native VOL connector                     */
+
 
 /****************/
 /* Local Macros */
@@ -74,6 +76,7 @@ typedef struct H5F_olist_t {
 /* Local Prototypes */
 /********************/
 
+static herr_t H5F__set_vol_conn(H5F_t *file);
 static herr_t H5F__get_objects(const H5F_t *f, unsigned types, size_t max_index, hid_t *obj_id_list, hbool_t app_ref, size_t *obj_id_count_ptr);
 static int H5F__get_objects_cb(void *obj_ptr, hid_t obj_id, void *key);
 static herr_t H5F__build_name(const char *prefix, const char *file_name, char **full_name/*out*/);
@@ -115,39 +118,46 @@ H5FL_DEFINE(H5F_file_t);
  *
  *-------------------------------------------------------------------------
  */
-herr_t
-H5F__set_vol_conn(H5F_t *file, hid_t vol_id, const void *vol_info)
+static herr_t
+H5F__set_vol_conn(H5F_t *file)
 {
+    H5VL_connector_prop_t connector_prop; /* Property for VOL connector ID & info */
     void *new_connector_info = NULL;    /* Copy of connector info */
     herr_t ret_value = SUCCEED;         /* Return value */
 
-    FUNC_ENTER_PACKAGE
+    FUNC_ENTER_STATIC
 
     /* Sanity check */
     HDassert(file);
 
-    /* Only cache VOL connector ID & info the first time the file is opened */
-    if(file->shared->nrefs == 1) {
-        /* Copy connector info, if it exists */
-        if(vol_info) {
-            H5VL_class_t *connector;           /* Pointer to connector */
+    /* Retrieve a copy of the "top-level" connector property, before any pass-through
+     *  connectors modified or unwrapped it.
+     */
+    if(H5CX_get_vol_connector_prop(&connector_prop) < 0)
+        HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't get VOL connector info from API context")
 
-            /* Retrieve the connector for the ID */
-            if(NULL == (connector = (H5VL_class_t *)H5I_object(vol_id)))
-                HGOTO_ERROR(H5E_FILE, H5E_BADTYPE, FAIL, "not a VOL connector ID")
+    /* Sanity check */
+    HDassert(0 != connector_prop.connector_id);
 
-            /* Allocate and copy connector info */
-            if(H5VL_copy_connector_info(connector, &new_connector_info, vol_info) < 0)
-                HGOTO_ERROR(H5E_FILE, H5E_CANTCOPY, FAIL, "connector info copy failed")
-        } /* end if */
+    /* Copy connector info, if it exists */
+    if(connector_prop.connector_info) {
+        H5VL_class_t *connector;           /* Pointer to connector */
 
-        /* Cache the connector ID & info for the container */
-        file->shared->vol_id = vol_id;
-        file->shared->vol_info = new_connector_info;
-        if(H5I_inc_ref(file->shared->vol_id, FALSE) < 0)
-            HGOTO_ERROR(H5E_FILE, H5E_CANTINC, FAIL, "incrementing VOL connector ID failed")
+        /* Retrieve the connector for the ID */
+        if(NULL == (connector = (H5VL_class_t *)H5I_object(connector_prop.connector_id)))
+            HGOTO_ERROR(H5E_FILE, H5E_BADTYPE, FAIL, "not a VOL connector ID")
+
+        /* Allocate and copy connector info */
+        if(H5VL_copy_connector_info(connector, &new_connector_info, connector_prop.connector_info) < 0)
+            HGOTO_ERROR(H5E_FILE, H5E_CANTCOPY, FAIL, "connector info copy failed")
     } /* end if */
 
+    /* Cache the connector ID & info for the container */
+    file->shared->vol_id = connector_prop.connector_id;
+    file->shared->vol_info = new_connector_info;
+    if(H5I_inc_ref(file->shared->vol_id, FALSE) < 0)
+        HGOTO_ERROR(H5E_FILE, H5E_CANTINC, FAIL, "incrementing VOL connector ID failed")
+
 done:
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5F__set_vol_conn() */
@@ -492,7 +502,6 @@ H5F__get_objects_cb(void *obj_ptr, hid_t obj_id, void *key)
             case H5I_BADID:
             case H5I_FILE:
             case H5I_DATASPACE:
-            case H5I_REFERENCE:
             case H5I_VFL:
             case H5I_VOL:
             case H5I_GENPROP_CLS:
@@ -793,14 +802,12 @@ H5F_prefix_open_file(H5F_t *primary_file, H5F_prefix_open_t prefix_type,
 
         /* get last component of file_name */
         H5_GET_LAST_DELIMITER(actual_file_name, ptr)
-        if(!ptr)
-            HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to open file, file name = '%s', temp_file_name = '%s'", file_name, temp_file_name)
-
-        /* Truncate filename portion from actual file name path */
-        *ptr = '\0';
+        if(ptr)
+            /* Truncate filename portion from actual file name path */
+            *ptr = '\0';
 
         /* Build new file name for the external file */
-        if(H5F__build_name(actual_file_name, temp_file_name, &full_name/*out*/) < 0)
+        if(H5F__build_name((ptr ? actual_file_name : ""), temp_file_name, &full_name/*out*/) < 0)
             HGOTO_ERROR(H5E_FILE, H5E_CANTGET, NULL, "can't prepend prefix to filename")
         actual_file_name = (char *)H5MM_xfree(actual_file_name);
 
@@ -816,7 +823,7 @@ H5F_prefix_open_file(H5F_t *primary_file, H5F_prefix_open_t prefix_type,
             H5E_clear_stack(NULL);
     } /* end if */
 
-    /* Success */
+    /* Set return value (possibly NULL or valid H5F_t *) */
     ret_value = src_file;
 
 done:
@@ -1090,6 +1097,10 @@ H5F__new(H5F_file_t *shared, unsigned flags, hid_t fcpl_id, hid_t fapl_id, H5FD_
         if(H5P_get(plist, H5F_ACS_OBJECT_FLUSH_CB_NAME, &(f->shared->object_flush)) < 0)
             HGOTO_ERROR(H5E_FILE, H5E_CANTGET, NULL, "can't get object flush cb info")
 
+        /* Get the VOL connector info */
+        if(H5F__set_vol_conn(f) < 0)
+            HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, NULL, "can't cache VOL connector info")
+
         /* Create a metadata cache with the specified number of elements.
          * The cache might be created with a different number of elements and
          * the access property list should be updated to reflect that.
@@ -3601,7 +3612,6 @@ H5F__get_file(void *obj, H5I_type_t type)
         case H5I_UNINIT:
         case H5I_BADID:
         case H5I_DATASPACE:
-        case H5I_REFERENCE:
         case H5I_VFL:
         case H5I_VOL:
         case H5I_GENPROP_CLS:
@@ -3695,7 +3705,7 @@ H5F_get_file_id(hid_t obj_id, H5I_type_t type)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, H5I_INVALID_HID, "invalid identifier")
 
     /* Get the file through the VOL */
-    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_FILE_GET_FILE_ID, type, &file_id) < 0)
+    if(H5VL_file_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_FILE_GET_FILE_ID, (int)type, &file_id) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, H5I_INVALID_HID, "unable to get file ID")
     if(H5I_INVALID_HID == file_id)
         HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, H5I_INVALID_HID, "unable to get the file ID through the VOL")
@@ -3707,3 +3717,27 @@ done:
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5F_get_file_id() */
 
+
+/*-------------------------------------------------------------------------
+ * Function:    H5F_set_min_dset_ohdr
+ *
+ * Purpose:     Set the crt_dset_ohdr_flag field with a new value.
+ *
+ * Return:      SUCCEED/FAIL
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5F_set_min_dset_ohdr(H5F_t *f, hbool_t minimize)
+{
+    /* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    /* Sanity check */
+    HDassert(f);
+    HDassert(f->shared);
+
+    f->shared->crt_dset_min_ohdr_flag = minimize;
+
+    FUNC_LEAVE_NOAPI(SUCCEED)
+} /* H5F_set_min_dset_ohdr() */
+
diff --git a/src/H5Fmount.c b/src/H5Fmount.c
index d7f8915..13d95aa 100644
--- a/src/H5Fmount.c
+++ b/src/H5Fmount.c
@@ -482,7 +482,7 @@ H5Fmount(hid_t loc_id, const char *name, hid_t child_id, hid_t plist_id)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "Can't mount file onto object from different VOL connector")
 
     /* Perform the mount operation */
-    if(H5VL_file_specific(loc_vol_obj, H5VL_FILE_MOUNT, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, loc_type, name, child_vol_obj->data, plist_id) < 0)
+    if(H5VL_file_specific(loc_vol_obj, H5VL_FILE_MOUNT, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, (int)loc_type, name, child_vol_obj->data, plist_id) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_MOUNT, FAIL, "unable to mount file")
 
 done:
@@ -534,7 +534,7 @@ H5Funmount(hid_t loc_id, const char *name)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "could not get location object")
 
     /* Perform the unmount operation */
-    if(H5VL_file_specific(vol_obj, H5VL_FILE_UNMOUNT, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, loc_type, name) < 0)
+    if(H5VL_file_specific(vol_obj, H5VL_FILE_UNMOUNT, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, (int)loc_type, name) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_MOUNT, FAIL, "unable to unmount file")
 
 done:
diff --git a/src/H5Fpkg.h b/src/H5Fpkg.h
index fc902b0..335d0a7 100644
--- a/src/H5Fpkg.h
+++ b/src/H5Fpkg.h
@@ -358,6 +358,7 @@ struct H5F_file_t {
 
     /* Object flush info */
     H5F_object_flush_t 	object_flush;	    /* Information for object flush callback */
+    hbool_t crt_dset_min_ohdr_flag; /* flag to minimize created dataset object header */
 };
 
 /*
@@ -382,36 +383,6 @@ struct H5F_t {
 #endif /* H5_HAVE_PARALLEL */
 };
 
-/* types for file optional VOL operations */
-typedef enum H5VL_file_optional_t {
-    H5VL_FILE_CLEAR_ELINK_CACHE,        /* Clear external link cache            */
-    H5VL_FILE_GET_FILE_IMAGE,           /* file image                           */
-    H5VL_FILE_GET_FREE_SECTIONS,        /* file free selections                 */
-    H5VL_FILE_GET_FREE_SPACE,	        /* file freespace         		*/
-    H5VL_FILE_GET_INFO,	                /* file info             		*/
-    H5VL_FILE_GET_MDC_CONF,	        /* file metadata cache configuration	*/
-    H5VL_FILE_GET_MDC_HR,	        /* file metadata cache hit rate		*/
-    H5VL_FILE_GET_MDC_SIZE,             /* file metadata cache size		*/
-    H5VL_FILE_GET_SIZE,	                /* file size             		*/
-    H5VL_FILE_GET_VFD_HANDLE,	        /* file VFD handle       		*/
-    H5VL_FILE_GET_FILE_ID,              /* retrieve or resurrect file ID of object */
-    H5VL_FILE_RESET_MDC_HIT_RATE,       /* get metadata cache hit rate          */
-    H5VL_FILE_SET_MDC_CONFIG,           /* set metadata cache configuration     */
-    H5VL_FILE_GET_METADATA_READ_RETRY_INFO,
-    H5VL_FILE_START_SWMR_WRITE,
-    H5VL_FILE_START_MDC_LOGGING,
-    H5VL_FILE_STOP_MDC_LOGGING,
-    H5VL_FILE_GET_MDC_LOGGING_STATUS,
-    H5VL_FILE_FORMAT_CONVERT,
-    H5VL_FILE_RESET_PAGE_BUFFERING_STATS,
-    H5VL_FILE_GET_PAGE_BUFFERING_STATS,
-    H5VL_FILE_GET_MDC_IMAGE_INFO,
-    H5VL_FILE_GET_EOA,
-    H5VL_FILE_INCR_FILESIZE,
-    H5VL_FILE_SET_LIBVER_BOUNDS
-} H5VL_file_optional_t;
-
-
 /*****************************/
 /* Package Private Variables */
 /*****************************/
@@ -440,7 +411,6 @@ H5_DLL herr_t H5F__close(H5F_t *f);
 H5_DLL herr_t H5F__set_libver_bounds(H5F_t *f, H5F_libver_t low, H5F_libver_t high);
 H5_DLL H5F_t *H5F__get_file(void *obj, H5I_type_t type);
 H5_DLL hid_t H5F__get_file_id(H5F_t *file);
-H5_DLL herr_t H5F__set_vol_conn(H5F_t *file, hid_t vol_id, const void *vol_info);
 
 /* File mount related routines */
 H5_DLL herr_t H5F__mount(H5G_loc_t *loc, const char *name, H5F_t *child, hid_t plist_id);
diff --git a/src/H5Fprivate.h b/src/H5Fprivate.h
index 83513a5..5f7a1b2 100644
--- a/src/H5Fprivate.h
+++ b/src/H5Fprivate.h
@@ -331,6 +331,8 @@ typedef struct H5F_t H5F_t;
 #define H5F_POINT_OF_NO_RETURN(F) ((F)->shared->fs.point_of_no_return)
 #define H5F_FIRST_ALLOC_DEALLOC(F) ((F)->shared->first_alloc_dealloc)
 #define H5F_EOA_PRE_FSM_FSALLOC(F) ((F)->shared->eoa_pre_fsm_fsalloc)
+#define H5F_GET_MIN_DSET_OHDR(F) ((F)->shared->crt_dset_min_ohdr_flag)
+#define H5F_SET_MIN_DSET_OHDR(F, V) ((F)->shared->crt_dset_min_ohdr_flag = (V))
 #else /* H5F_MODULE */
 #define H5F_LOW_BOUND(F)        (H5F_get_low_bound(F))
 #define H5F_HIGH_BOUND(F)       (H5F_get_high_bound(F))
@@ -388,6 +390,8 @@ typedef struct H5F_t H5F_t;
 #define H5F_POINT_OF_NO_RETURN(F) (H5F_get_point_of_no_return(F))
 #define H5F_FIRST_ALLOC_DEALLOC(F) (H5F_get_first_alloc_dealloc(F))
 #define H5F_EOA_PRE_FSM_FSALLOC(F) (H5F_get_eoa_pre_fsm_fsalloc(F))
+#define H5F_GET_MIN_DSET_OHDR(F) (H5F_get_min_dset_ohdr(F))
+#define H5F_SET_MIN_DSET_OHDR(F, V) (H5F_set_min_dset_ohdr((F), (V)))
 #endif /* H5F_MODULE */
 
 
@@ -500,9 +504,7 @@ typedef struct H5F_t H5F_t;
 #define H5F_ACS_USE_MDC_LOGGING_NAME            "use_mdc_logging" /* Whether to use metadata cache logging */
 #define H5F_ACS_MDC_LOG_LOCATION_NAME           "mdc_log_location" /* Name of metadata cache log location */
 #define H5F_ACS_START_MDC_LOG_ON_ACCESS_NAME    "start_mdc_log_on_access" /* Whether logging starts on file create/open */
-#define H5F_ACS_CORE_WRITE_TRACKING_FLAG_NAME   "core_write_tracking_flag" /* Whether or not core VFD backing store write tracking is enabled */
 #define H5F_ACS_EVICT_ON_CLOSE_FLAG_NAME        "evict_on_close_flag" /* Whether or not the metadata cache will evict objects on close */
-#define H5F_ACS_CORE_WRITE_TRACKING_PAGE_SIZE_NAME "core_write_tracking_page_size" /* The page size in kiB when core VFD write tracking is enabled */
 #define H5F_ACS_COLL_MD_WRITE_FLAG_NAME         "collective_metadata_write" /* property indicating whether metadata writes are done collectively or not */
 #define H5F_ACS_META_CACHE_INIT_IMAGE_CONFIG_NAME "mdc_initCacheImageCfg" /* Initial metadata cache image creation configuration */
 #define H5F_ACS_PAGE_BUFFER_SIZE_NAME           "page_buffer_size" /* the maximum size for the page buffer cache */
@@ -742,6 +744,8 @@ H5_DLL hsize_t H5F_get_pgend_meta_thres(const H5F_t *f);
 H5_DLL hbool_t H5F_get_point_of_no_return(const H5F_t *f);
 H5_DLL hbool_t H5F_get_first_alloc_dealloc(const H5F_t *f);
 H5_DLL haddr_t H5F_get_eoa_pre_fsm_fsalloc(const H5F_t *f);
+H5_DLL hbool_t H5F_get_min_dset_ohdr(const H5F_t *f);
+H5_DLL herr_t H5F_set_min_dset_ohdr(H5F_t *f, hbool_t minimize);
 
 /* Functions than retrieve values set/cached from the superblock/FCPL */
 H5_DLL haddr_t H5F_get_base_addr(const H5F_t *f);
diff --git a/src/H5Fpublic.h b/src/H5Fpublic.h
index 8e54e7f..9f1ed01 100644
--- a/src/H5Fpublic.h
+++ b/src/H5Fpublic.h
@@ -217,12 +217,13 @@ typedef struct H5F_retry_info_t {
 /* Callback for H5Pset_object_flush_cb() in a file access property list */
 typedef herr_t (*H5F_flush_cb_t)(hid_t object_id, void *udata);
 
-
+/*********************/
+/* Public Prototypes */
+/*********************/
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-/* Functions in H5F.c */
 H5_DLL htri_t H5Fis_accessible(const char *container_name, hid_t fapl_id);
 H5_DLL hid_t  H5Fcreate(const char *filename, unsigned flags,
 		  	  hid_t create_plist, hid_t access_plist);
@@ -233,7 +234,7 @@ H5_DLL herr_t H5Fflush(hid_t object_id, H5F_scope_t scope);
 H5_DLL herr_t H5Fclose(hid_t file_id);
 H5_DLL hid_t  H5Fget_create_plist(hid_t file_id);
 H5_DLL hid_t  H5Fget_access_plist(hid_t file_id);
-H5_DLL herr_t H5Fget_intent(hid_t file_id, unsigned * intent);
+H5_DLL herr_t H5Fget_intent(hid_t file_id, unsigned *intent);
 H5_DLL ssize_t H5Fget_obj_count(hid_t file_id, unsigned types);
 H5_DLL ssize_t H5Fget_obj_ids(hid_t file_id, unsigned types, size_t max_objs, hid_t *obj_id_list);
 H5_DLL herr_t H5Fget_vfd_handle(hid_t file_id, hid_t fapl, void **file_handle);
@@ -273,6 +274,8 @@ H5_DLL herr_t H5Freset_page_buffering_stats(hid_t file_id);
 H5_DLL herr_t H5Fget_page_buffering_stats(hid_t file_id, unsigned accesses[2],
     unsigned hits[2], unsigned misses[2], unsigned evictions[2], unsigned bypasses[2]);
 H5_DLL herr_t H5Fget_mdc_image_info(hid_t file_id, haddr_t *image_addr, hsize_t *image_size);
+H5_DLL herr_t H5Fget_dset_no_attrs_hint(hid_t file_id, hbool_t *minimize);
+H5_DLL herr_t H5Fset_dset_no_attrs_hint(hid_t file_id, hbool_t minimize);
 
 #ifdef H5_HAVE_PARALLEL
 H5_DLL herr_t H5Fset_mpi_atomicity(hid_t file_id, hbool_t flag);
diff --git a/src/H5Fquery.c b/src/H5Fquery.c
index 3147e95..103ad3b 100644
--- a/src/H5Fquery.c
+++ b/src/H5Fquery.c
@@ -514,6 +514,25 @@ H5F_sym_leaf_k(const H5F_t *f)
 
 
 /*-------------------------------------------------------------------------
+ * Function: H5F_get_min_dset_ohdr
+ *
+ * Purpose:  Get the setting flag for minimized dataset object headers
+ *
+ * Return:   TRUE/FALSE as set in file
+ *-------------------------------------------------------------------------
+ */
+hbool_t
+H5F_get_min_dset_ohdr(const H5F_t *f)
+{
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    HDassert(f);
+
+    FUNC_LEAVE_NOAPI(f->shared->crt_dset_min_ohdr_flag)
+} /* end H5F_get_min_dset_ohdr */
+
+
+/*-------------------------------------------------------------------------
  * Function: H5F_Kvalue
  *
  * Purpose:  Replaced a macro to retrieve a B-tree key value for a certain
diff --git a/src/H5Gdeprec.c b/src/H5Gdeprec.c
index a15703e..cb03b5e 100644
--- a/src/H5Gdeprec.c
+++ b/src/H5Gdeprec.c
@@ -45,6 +45,8 @@
 #include "H5Pprivate.h"         /* Property lists                       */
 #include "H5VLprivate.h"        /* Virtual Object Layer                 */
 
+#include "H5VLnative_private.h" /* Native VOL connector                     */
+
 
 /****************/
 /* Local Macros */
@@ -734,7 +736,7 @@ H5Gset_comment(hid_t loc_id, const char *name, const char *comment)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid location identifier")
 
     /* Set the comment */
-    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_OBJECT_SET_COMMENT, &loc_params, comment) < 0)
+    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_OBJECT_SET_COMMENT, &loc_params, comment) < 0)
         HGOTO_ERROR(H5E_SYM, H5E_CANTSET, FAIL, "unable to set comment value")
 
 done:
@@ -770,19 +772,20 @@ H5Gget_comment(hid_t loc_id, const char *name, size_t bufsize, char *buf)
 {
     H5VL_object_t *vol_obj;             /* Object token of loc_id */
     H5VL_loc_params_t loc_params;
+    ssize_t op_ret;                     /* Return value from operation */
     int	ret_value;                      /* Return value */
 
-    FUNC_ENTER_API(FAIL)
+    FUNC_ENTER_API(-1)
     H5TRACE4("Is", "i*sz*s", loc_id, name, bufsize, buf);
 
     if(!name || !*name)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name specified")
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, -1, "no name specified")
     if(bufsize > 0 && !buf)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no buffer specified")
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, -1, "no buffer specified")
 
     /* Set up collective metadata if appropriate */
     if(H5CX_set_loc(loc_id) < 0)
-        HGOTO_ERROR(H5E_SYM, H5E_CANTSET, FAIL, "can't set collective metadata read info")
+        HGOTO_ERROR(H5E_SYM, H5E_CANTSET, -1, "can't set collective metadata read info")
 
     /* Fill in location struct fields */
     loc_params.type                         = H5VL_OBJECT_BY_NAME;
@@ -792,11 +795,14 @@ H5Gget_comment(hid_t loc_id, const char *name, size_t bufsize, char *buf)
 
     /* Get the location object */
     if(NULL == (vol_obj = H5VL_vol_object(loc_id)))
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid location identifier")
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, -1, "invalid location identifier")
 
     /* Get the comment */
-    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_OBJECT_GET_COMMENT, &loc_params, buf, bufsize, &ret_value) < 0)
-        HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "unable to get comment value")
+    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_OBJECT_GET_COMMENT, &loc_params, buf, bufsize, &op_ret) < 0)
+        HGOTO_ERROR(H5E_SYM, H5E_CANTGET, -1, "unable to get comment value")
+
+    /* Set return value */
+    ret_value = (int)op_ret;
 
 done:
     FUNC_LEAVE_API(ret_value)
@@ -868,7 +874,7 @@ H5Giterate(hid_t loc_id, const char *name, int *idx_p, H5G_iterate_t op,
         HGOTO_ERROR(H5E_ATOM, H5E_BADTYPE, (-1), "invalid identifier")
 
     /* Call private iteration function, through VOL callback */
-    if((ret_value = H5VL_group_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_GROUP_ITERATE_OLD, &loc_params, idx, &last_obj, &lnk_op, op_data)) < 0)
+    if((ret_value = H5VL_group_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_GROUP_ITERATE_OLD, &loc_params, idx, &last_obj, &lnk_op, op_data)) < 0)
         HERROR(H5E_SYM, H5E_BADITER, "error iterating over group's links");
 
     /* Set the index we stopped at */
@@ -985,7 +991,7 @@ H5Gget_objinfo(hid_t loc_id, const char *name, hbool_t follow_link,
             HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid location identifier")
 
         /* Retrieve the object's information */
-        if(H5VL_group_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_GROUP_GET_OBJINFO, &loc_params, (unsigned)follow_link, statbuf) < 0)
+        if(H5VL_group_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_GROUP_GET_OBJINFO, &loc_params, (unsigned)follow_link, statbuf) < 0)
             HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't get info for object: '%s'", name)
     } /* end if */
 
@@ -1239,7 +1245,7 @@ H5Gget_objtype_by_idx(hid_t loc_id, hsize_t idx)
 
     /* Retrieve the object's basic information (which includes its type) */
     fields = H5O_INFO_BASIC;
-    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_OBJECT_GET_INFO, &loc_params, &oinfo, fields) < 0)
+    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_OBJECT_GET_INFO, &loc_params, &oinfo, fields) < 0)
         HGOTO_ERROR(H5E_SYM, H5E_BADTYPE, H5G_UNKNOWN, "can't get object info")
 
     /* Map to group object type */
diff --git a/src/H5Gloc.c b/src/H5Gloc.c
index 2dacd94..5724031 100644
--- a/src/H5Gloc.c
+++ b/src/H5Gloc.c
@@ -210,9 +210,6 @@ H5G_loc_real(void *obj, H5I_type_t type, H5G_loc_t *loc)
             break;
         }
 
-        case H5I_REFERENCE:
-            HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "unable to get group location of reference")
-
         case H5I_DATASPACE:
             HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "unable to get group location of dataspace")
 
diff --git a/src/H5Gname.c b/src/H5Gname.c
index f6ddeeb..2aece2b 100644
--- a/src/H5Gname.c
+++ b/src/H5Gname.c
@@ -821,7 +821,6 @@ H5G_name_replace_cb(void *obj_ptr, hid_t obj_id, void *key)
         case H5I_FILE:
         case H5I_DATASPACE:
         case H5I_ATTR:
-        case H5I_REFERENCE:
         case H5I_VFL:
         case H5I_VOL:
         case H5I_GENPROP_CLS:
diff --git a/src/H5Gpkg.h b/src/H5Gpkg.h
index 159b6f5..f475bde 100644
--- a/src/H5Gpkg.h
+++ b/src/H5Gpkg.h
@@ -299,22 +299,6 @@ typedef struct H5G_copy_file_ud_t {
     H5G_cache_t cache;                  /* Cached data for symbol table entry */
 } H5G_copy_file_ud_t;
 
-/* Types for optional group VOL operations */
-typedef enum H5VL_group_optional_t {
-    H5VL_GROUP_ITERATE_OLD,             /* HG5Giterate (deprecated routine) */
-    H5VL_GROUP_GET_OBJINFO              /* HG5Gget_objinfo (deprecated routine) */
-                                        /* (These two enum values should have an
-                                         *      "#ifndefH5_NO_DEPRECATED_SYMBOLS"
-                                         *      around them, but the compiler
-                                         *      complains about an empty enum
-                                         *      when deprecated symbols are
-                                         *      disabled currently.  When
-                                         *      another enum value is added,
-                                         *      please put the #ifdef around
-                                         *      these symbols.  QAK - 2018/12/06
-                                         */
-} H5VL_group_optional_t;
-
 
 /*****************************/
 /* Package Private Variables */
diff --git a/src/H5Gpublic.h b/src/H5Gpublic.h
index ab6f200..170b74d 100644
--- a/src/H5Gpublic.h
+++ b/src/H5Gpublic.h
@@ -37,10 +37,6 @@
 /* Public Macros */
 /*****************/
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /*******************/
 /* Public Typedefs */
 /*******************/
@@ -62,6 +58,7 @@ typedef struct H5G_info_t {
     hbool_t     mounted;                /* Whether group has a file mounted on it */
 } H5G_info_t;
 
+
 /********************/
 /* Public Variables */
 /********************/
@@ -70,6 +67,10 @@ typedef struct H5G_info_t {
 /*********************/
 /* Public Prototypes */
 /*********************/
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 H5_DLL hid_t H5Gcreate2(hid_t loc_id, const char *name, hid_t lcpl_id,
     hid_t gcpl_id, hid_t gapl_id);
 H5_DLL hid_t H5Gcreate_anon(hid_t loc_id, hid_t gcpl_id, hid_t gapl_id);
diff --git a/src/H5Gtest.c b/src/H5Gtest.c
index 1995015..af6acb3 100644
--- a/src/H5Gtest.c
+++ b/src/H5Gtest.c
@@ -609,7 +609,6 @@ H5G__user_path_test(hid_t obj_id, char *user_path, size_t *user_path_len, unsign
         case H5I_FILE:
         case H5I_DATASPACE:
         case H5I_ATTR:
-        case H5I_REFERENCE:
         case H5I_VFL:
         case H5I_VOL:
         case H5I_GENPROP_CLS:
diff --git a/src/H5I.c b/src/H5I.c
index 68cbe55..ca9ff61 100644
--- a/src/H5I.c
+++ b/src/H5I.c
@@ -2372,7 +2372,6 @@ H5I__id_dump_cb(void *_item, void H5_ATTR_UNUSED *_key, void *_udata)
         case H5I_FILE:
         case H5I_DATASPACE:
         case H5I_ATTR:
-        case H5I_REFERENCE:
         case H5I_VFL:
         case H5I_VOL:
         case H5I_GENPROP_CLS:
diff --git a/src/H5Ipublic.h b/src/H5Ipublic.h
index f4b5cc9..56873ec 100644
--- a/src/H5Ipublic.h
+++ b/src/H5Ipublic.h
@@ -29,9 +29,6 @@
  *
  * When adding types here, add a section to the 'misc19' test in test/tmisc.c
  * to verify that the H5I{inc|dec|get}_ref() routines work correctly with it.
- *
- * NOTE: H5I_REFERENCE is not used by the library and has been deprecated
- *       with a tentative removal version of 1.12.0. (DER, July 2017)
  */
 typedef enum H5I_type_t {
     H5I_UNINIT      = (-2),     /* uninitialized type                           */
@@ -42,7 +39,6 @@ typedef enum H5I_type_t {
     H5I_DATASPACE,              /* type ID for Dataspace objects                */
     H5I_DATASET,                /* type ID for Dataset objects                  */
     H5I_ATTR,                   /* type ID for Attribute objects                */
-    H5I_REFERENCE,              /* *DEPRECATED* type ID for Reference objects   */
     H5I_VFL,                    /* type ID for virtual file layer               */
     H5I_VOL,                    /* type ID for virtual object layer             */
     H5I_GENPROP_CLS,            /* type ID for generic property list classes    */
diff --git a/src/H5L.c b/src/H5L.c
index 9506e7d..1f45740 100644
--- a/src/H5L.c
+++ b/src/H5L.c
@@ -648,6 +648,8 @@ H5Lcreate_ud(hid_t link_loc_id, const char *link_name, H5L_type_t link_type,
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no link name specified")
     if(link_type < H5L_TYPE_UD_MIN || link_type > H5L_TYPE_MAX)
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid link class")
+    if(!udata && udata_size)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "udata cannot be NULL if udata_size is non-zero")
 
     /* Check the group access property list */
     if(H5P_DEFAULT == lcpl_id)
@@ -1332,7 +1334,7 @@ H5Literate(hid_t group_id, H5_index_t idx_type, H5_iter_order_t order,
     loc_params.obj_type = H5I_get_type(group_id);
 
     /* Iterate over the links */
-    if((ret_value = H5VL_link_specific(vol_obj, &loc_params, H5VL_LINK_ITER, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, FALSE, idx_type, order, idx_p, op, op_data)) < 0)
+    if((ret_value = H5VL_link_specific(vol_obj, &loc_params, H5VL_LINK_ITER, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, (unsigned)FALSE, (int)idx_type, (int)order, idx_p, op, op_data)) < 0)
         HGOTO_ERROR(H5E_LINK, H5E_BADITER, FAIL, "link iteration failed")
 
 done:
diff --git a/src/H5O.c b/src/H5O.c
index 2ea8c10..4e2f603 100644
--- a/src/H5O.c
+++ b/src/H5O.c
@@ -38,6 +38,8 @@
 #include "H5Lprivate.h"         /* Links                                    */
 #include "H5Opkg.h"             /* Object headers                           */
 
+#include "H5VLnative_private.h" /* Native VOL connector                     */
+
 
 /****************/
 /* Local Macros */
@@ -575,7 +577,7 @@ H5Oget_info2(hid_t loc_id, H5O_info_t *oinfo, unsigned fields)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid location identifier")
 
     /* Retrieve the object's information */
-    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_OBJECT_GET_INFO, &loc_params, oinfo, fields) < 0)
+    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_OBJECT_GET_INFO, &loc_params, oinfo, fields) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't get info for object")
 
 done:
@@ -633,7 +635,7 @@ H5Oget_info_by_name2(hid_t loc_id, const char *name, H5O_info_t *oinfo,
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid location identifier")
 
     /* Retrieve the object's information */
-    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_OBJECT_GET_INFO, &loc_params, oinfo, fields) < 0)
+    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_OBJECT_GET_INFO, &loc_params, oinfo, fields) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't get info for object: '%s'", name)
 
 done:
@@ -698,7 +700,7 @@ H5Oget_info_by_idx2(hid_t loc_id, const char *group_name, H5_index_t idx_type,
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid location identifier")
 
     /* Retrieve the object's information */
-    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_OBJECT_GET_INFO, &loc_params, oinfo, fields) < 0)
+    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_OBJECT_GET_INFO, &loc_params, oinfo, fields) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't get info for object")
 
 done:
@@ -746,7 +748,7 @@ H5Oset_comment(hid_t obj_id, const char *comment)
     loc_params.obj_type = H5I_get_type(obj_id);
 
     /* (Re)set the object's comment */
-    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_OBJECT_SET_COMMENT, &loc_params, comment) < 0)
+    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_OBJECT_SET_COMMENT, &loc_params, comment) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_CANTSET, FAIL, "can't set comment for object")
 
 done:
@@ -801,7 +803,7 @@ H5Oset_comment_by_name(hid_t loc_id, const char *name, const char *comment,
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid location identifier")
 
     /* (Re)set the object's comment */
-    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_OBJECT_SET_COMMENT, &loc_params, comment) < 0)
+    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_OBJECT_SET_COMMENT, &loc_params, comment) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_CANTSET, FAIL, "can't set comment for object: '%s'", name)
 
 done:
@@ -844,7 +846,7 @@ H5Oget_comment(hid_t obj_id, char *comment, size_t bufsize)
     loc_params.obj_type     = H5I_get_type(obj_id);
 
     /* Retrieve the object's comment */
-    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_OBJECT_GET_COMMENT, &loc_params, comment, bufsize, &ret_value) < 0)
+    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_OBJECT_GET_COMMENT, &loc_params, comment, bufsize, &ret_value) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, (-1), "can't get comment for object")
 
 done:
@@ -898,7 +900,7 @@ H5Oget_comment_by_name(hid_t loc_id, const char *name, char *comment, size_t buf
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, (-1), "invalid location identifier")
 
     /* Retrieve the object's comment */
-    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_OBJECT_GET_COMMENT, &loc_params, comment, bufsize, &ret_value) < 0)
+    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_OBJECT_GET_COMMENT, &loc_params, comment, bufsize, &ret_value) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, (-1), "can't get comment for object: '%s'", name)
 
 done:
@@ -971,7 +973,7 @@ H5Ovisit2(hid_t obj_id, H5_index_t idx_type, H5_iter_order_t order,
     loc_params.obj_type     = H5I_get_type(obj_id);
 
     /* Visit the objects */
-    if((ret_value = H5VL_object_specific(vol_obj, &loc_params, H5VL_OBJECT_VISIT, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, idx_type, order, op, op_data, fields)) < 0)
+    if((ret_value = H5VL_object_specific(vol_obj, &loc_params, H5VL_OBJECT_VISIT, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, (int)idx_type, (int)order, op, op_data, fields)) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_BADITER, FAIL, "object iteration failed")
 
 done:
@@ -1055,7 +1057,7 @@ H5Ovisit_by_name2(hid_t loc_id, const char *obj_name, H5_index_t idx_type,
     loc_params.obj_type                     = H5I_get_type(loc_id);
 
     /* Visit the objects */
-    if((ret_value = H5VL_object_specific(vol_obj, &loc_params, H5VL_OBJECT_VISIT, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, idx_type, order, op, op_data, fields)) < 0)
+    if((ret_value = H5VL_object_specific(vol_obj, &loc_params, H5VL_OBJECT_VISIT, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, (int)idx_type, (int)order, op, op_data, fields)) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_BADITER, FAIL, "object iteration failed")
 
 done:
@@ -1104,7 +1106,6 @@ H5Oclose(hid_t object_id)
         case H5I_FILE:
         case H5I_DATASPACE:
         case H5I_ATTR:
-        case H5I_REFERENCE:
         case H5I_VFL:
         case H5I_VOL:
         case H5I_GENPROP_CLS:
diff --git a/src/H5Obogus.c b/src/H5Obogus.c
index fbf04f2..f3cca0f 100644
--- a/src/H5Obogus.c
+++ b/src/H5Obogus.c
@@ -49,7 +49,7 @@ const H5O_msg_class_t H5O_MSG_BOGUS_VALID[1] = {{
     H5O_BOGUS_VALID_ID,		/*message id number             */
     "bogus valid",             	/*message name for debugging    */
     0,     	                /*native message size           */
-    0,				/* messages are sharable?       */
+    H5O_SHARE_IS_SHARABLE,      /* messages are sharable?       */
     H5O__bogus_decode,        	/*decode message                */
     H5O_bogus_encode,        	/*encode message                */
     NULL,          	        /*copy the native value         */
@@ -73,7 +73,7 @@ const H5O_msg_class_t H5O_MSG_BOGUS_INVALID[1] = {{
     H5O_BOGUS_INVALID_ID, 	/*message id number             */
     "bogus invalid",          	/*message name for debugging    */
     0,                          /*native message size           */
-    0,                          /* messages are sharable?       */
+    H5O_SHARE_IS_SHARABLE,      /* messages are sharable?       */
     H5O__bogus_decode,          /*decode message                */
     H5O_bogus_encode,           /*encode message                */
     NULL,                       /*copy the native value         */
diff --git a/src/H5Ocache.c b/src/H5Ocache.c
index fba4f6e..578cff0 100644
--- a/src/H5Ocache.c
+++ b/src/H5Ocache.c
@@ -1390,7 +1390,8 @@ H5O__chunk_deserialize(H5O_t *oh, haddr_t addr, size_t len, const uint8_t *image
 
         /* Message size */
         UINT16DECODE(chunk_image, mesg_size);
-        HDassert(mesg_size == H5O_ALIGN_OH(oh, mesg_size));
+        if(mesg_size != H5O_ALIGN_OH(oh, mesg_size))
+            HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, FAIL, "message not aligned")
 
         /* Message flags */
         flags = *chunk_image++;
@@ -1402,10 +1403,9 @@ H5O__chunk_deserialize(H5O_t *oh, haddr_t addr, size_t len, const uint8_t *image
             HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, FAIL, "bad flag combination for message")
         if((flags & H5O_MSG_FLAG_WAS_UNKNOWN) && !(flags & H5O_MSG_FLAG_MARK_IF_UNKNOWN))
             HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, FAIL, "bad flag combination for message")
-        if((flags & H5O_MSG_FLAG_SHAREABLE)
-                && H5O_msg_class_g[id]
-                && !(H5O_msg_class_g[id]->share_flags & H5O_SHARE_IS_SHARABLE))
-            HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, FAIL, "message of unsharable class flagged as sharable")
+        /* Delay checking the "shareable" flag until we've made sure id
+         * references a valid message class that this version of the library
+         * knows about */
 
         /* Reserved bytes/creation index */
         if(oh->version == H5O_VERSION_1)
@@ -1517,9 +1517,17 @@ H5O__chunk_deserialize(H5O_t *oh, haddr_t addr, size_t len, const uint8_t *image
                     mesgs_modified = TRUE;
                 } /* end if */
             } /* end if */
-            else
+            else {
+                /* Check for message of unshareable class marked as "shareable"
+                 */
+                if((flags & H5O_MSG_FLAG_SHAREABLE)
+                        && H5O_msg_class_g[id]
+                        && !(H5O_msg_class_g[id]->share_flags & H5O_SHARE_IS_SHARABLE))
+                    HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, FAIL, "message of unshareable class flagged as shareable")
+
                 /* Set message class for "known" messages */
                 mesg->type = H5O_msg_class_g[id];
+            } /* end else */
 
             /* Do some inspection/interpretation of new messages from this chunk */
             /* (detect continuation messages, ref. count messages, etc.) */
diff --git a/src/H5Odeprec.c b/src/H5Odeprec.c
index 93fc18a..7aefc67 100644
--- a/src/H5Odeprec.c
+++ b/src/H5Odeprec.c
@@ -37,6 +37,8 @@
 #include "H5Iprivate.h"         /* IDs                                      */
 #include "H5Opkg.h"             /* Object headers                           */
 
+#include "H5VLnative_private.h" /* Native VOL connector                     */
+
 
 /****************/
 /* Local Macros */
@@ -109,7 +111,7 @@ H5Oget_info1(hid_t loc_id, H5O_info_t *oinfo)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid location identifier")
 
     /* Retrieve the object's information */
-    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_OBJECT_GET_INFO, &loc_params, oinfo, H5O_INFO_ALL) < 0)
+    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_OBJECT_GET_INFO, &loc_params, oinfo, H5O_INFO_ALL) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't get info for object")
 
 done:
@@ -160,7 +162,7 @@ H5Oget_info_by_name1(hid_t loc_id, const char *name, H5O_info_t *oinfo, hid_t la
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid location identifier")
 
     /* Retrieve the object's information */
-    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_OBJECT_GET_INFO, &loc_params, oinfo, H5O_INFO_ALL) < 0)
+    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_OBJECT_GET_INFO, &loc_params, oinfo, H5O_INFO_ALL) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't get info for object: '%s'", name)
 
 done:
@@ -221,7 +223,7 @@ H5Oget_info_by_idx1(hid_t loc_id, const char *group_name, H5_index_t idx_type,
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid location identifier")
 
     /* Retrieve the object's information */
-    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_OBJECT_GET_INFO, &loc_params, oinfo, H5O_INFO_ALL) < 0)
+    if(H5VL_object_optional(vol_obj, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, H5VL_NATIVE_OBJECT_GET_INFO, &loc_params, oinfo, H5O_INFO_ALL) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't get info for object")
 
 done:
@@ -289,7 +291,7 @@ H5Ovisit1(hid_t obj_id, H5_index_t idx_type, H5_iter_order_t order,
     loc_params.obj_type     = H5I_get_type(obj_id);
 
     /* Visit the objects */
-    if((ret_value = H5VL_object_specific(vol_obj, &loc_params, H5VL_OBJECT_VISIT, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, idx_type, order, op, op_data, H5O_INFO_ALL)) < 0)
+    if((ret_value = H5VL_object_specific(vol_obj, &loc_params, H5VL_OBJECT_VISIT, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, (int)idx_type, (int)order, op, op_data, H5O_INFO_ALL)) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_BADITER, FAIL, "object visitation failed")
 
 done:
@@ -368,7 +370,7 @@ H5Ovisit_by_name1(hid_t loc_id, const char *obj_name, H5_index_t idx_type,
     loc_params.obj_type                     = H5I_get_type(loc_id);
 
     /* Visit the objects */
-    if((ret_value = H5VL_object_specific(vol_obj, &loc_params, H5VL_OBJECT_VISIT, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, idx_type, order, op, op_data, H5O_INFO_ALL)) < 0)
+    if((ret_value = H5VL_object_specific(vol_obj, &loc_params, H5VL_OBJECT_VISIT, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, (int)idx_type, (int)order, op, op_data, H5O_INFO_ALL)) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_BADITER, FAIL, "object visitation failed")
 
 done:
diff --git a/src/H5Oflush.c b/src/H5Oflush.c
index 3e1ae46..da9d1d0 100644
--- a/src/H5Oflush.c
+++ b/src/H5Oflush.c
@@ -484,7 +484,6 @@ H5O_refresh_metadata_reopen(hid_t oid, H5G_loc_t *obj_loc, H5VL_t *vol_connector
         case H5I_FILE:
         case H5I_DATASPACE:
         case H5I_ATTR:
-        case H5I_REFERENCE:
         case H5I_VFL:
         case H5I_VOL:
         case H5I_GENPROP_CLS:
diff --git a/src/H5Oint.c b/src/H5Oint.c
index 52290f2..d3a409c 100644
--- a/src/H5Oint.c
+++ b/src/H5Oint.c
@@ -83,7 +83,6 @@ static herr_t H5O__visit_cb(hid_t group, const char *name, const H5L_info_t *lin
     void *_udata);
 static const H5O_obj_class_t *H5O__obj_class_real(const H5O_t *oh);
 
-
 /*********************/
 /* Package Variables */
 /*********************/
@@ -126,12 +125,7 @@ const H5O_msg_class_t *const H5O_msg_class_g[] = {
     H5O_MSG_REFCOUNT,		/*0x0016 Object's ref. count		*/
     H5O_MSG_FSINFO,		/*0x0017 Free-space manager info        */
     H5O_MSG_MDCI,               /*0x0018 Metadata cache image           */
-    H5O_MSG_UNKNOWN,		/*0x0019 Placeholder for unknown message */
-#ifdef H5O_ENABLE_BOGUS
-    H5O_MSG_BOGUS_INVALID, 	/*0x001A "Bogus invalid" (for testing) 	*/
-#else /* H5O_ENABLE_BOGUS */
-    NULL,                       /*0x001A "Bogus invalid" (for testing) 	*/
-#endif /* H5O_ENABLE_BOGUS */
+    H5O_MSG_UNKNOWN		/*0x0019 Placeholder for unknown message */
 };
 
 /* Format version bounds for object header */
@@ -277,99 +271,183 @@ done:
  *		matzke@llnl.gov
  *		Aug  5 1997
  *
+ * Changes:     2018 August 17
+ *              Jacob Smith 
+ *              Refactor out the operations into two separate steps --
+ *              preparation and application -- to facilitate overriding the
+ *              library-default size allocated for the object header. This
+ *              function is retained as a wrapper, to minimize changes to
+ *              unaffected calling functions.
+ *
  *-------------------------------------------------------------------------
  */
 herr_t
-H5O_create(H5F_t *f, size_t size_hint, size_t initial_rc, hid_t ocpl_id,
-    H5O_loc_t *loc/*out*/)
+H5O_create(H5F_t *f, size_t size_hint, size_t initial_rc, hid_t ocpl_id, H5O_loc_t *loc /*out*/)
 {
-    H5P_genplist_t  *oc_plist;          /* Object creation property list */
-    H5O_t      *oh = NULL;              /* Object header created */
-    haddr_t     oh_addr;                /* Address of initial object header */
-    size_t      oh_size;                /* Size of initial object header */
-    uint8_t	oh_flags;		/* Object header's initial status flags */
-    unsigned    insert_flags = H5AC__NO_FLAGS_SET; /* Flags for inserting object header into cache */
-    hbool_t     store_msg_crt_idx;      /* Whether to always store message creation indices for this file */
-    herr_t      ret_value = SUCCEED;    /* return value */
+    H5O_t  *oh        = NULL;
+    herr_t  ret_value = SUCCEED;
 
     FUNC_ENTER_NOAPI(FAIL)
 
-    /* check args */
     HDassert(f);
     HDassert(loc);
     HDassert(TRUE == H5P_isa_class(ocpl_id, H5P_OBJECT_CREATE));
 
+    /* create object header in freelist
+     * header version is set internally
+     */
+    oh = H5O__create_ohdr(f, ocpl_id);
+    if(NULL == oh)
+        HGOTO_ERROR(H5E_OHDR, H5E_BADVALUE, FAIL, "Can't instantiate object header")
+
+    /* apply object header information to file
+     */
+    if(H5O__apply_ohdr(f, oh, ocpl_id, size_hint, initial_rc, loc) < 0)
+        HGOTO_ERROR(H5E_OHDR, H5E_BADVALUE, FAIL, "Can't apply object header to file")
+
+done:
+    if((FAIL == ret_value) && (NULL != oh) && (H5O__free(oh) < 0))
+        HDONE_ERROR(H5E_OHDR, H5E_CANTFREE, FAIL, "can't delete object header")
+
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5O_create() */
+
+
+/*-----------------------------------------------------------------------------
+ * Function:   H5O__create_ohdr
+ *
+ * Purpose:    Create the object header, set version and flags.
+ *
+ * Return:     Success: Pointer to the newly-crated header object.
+ *             Failure: NULL
+ *
+ * Programmer: Jacob Smith
+ *             2018 August 17 
+ *
+ *-----------------------------------------------------------------------------
+ */
+H5O_t *
+H5O__create_ohdr(H5F_t *f, hid_t ocpl_id)
+{
+    H5P_genplist_t *oc_plist;
+    H5O_t          *oh = NULL;        /* Object header in Freelist */
+    uint8_t         oh_flags;         /* Initial status flags */
+    H5O_t          *ret_value = NULL;
+
+    FUNC_ENTER_NOAPI(NULL)
+
+    HDassert(f);
+    HDassert(TRUE == H5P_isa_class(ocpl_id, H5P_OBJECT_CREATE));
+
     /* Check for invalid access request */
     if(0 == (H5F_INTENT(f) & H5F_ACC_RDWR))
-        HGOTO_ERROR(H5E_OHDR, H5E_BADVALUE, FAIL, "no write intent on file")
+        HGOTO_ERROR(H5E_OHDR, H5E_BADVALUE, NULL, "no write intent on file")
 
-    /* Make certain we allocate at least a reasonable size for the object header */
-    size_hint = H5O_ALIGN_F(f, MAX(H5O_MIN_SIZE, size_hint));
+    oh = H5FL_CALLOC(H5O_t);
+    if(NULL == oh)
+        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")
 
-    /* Get the property list */
-    if(NULL == (oc_plist = (H5P_genplist_t *)H5I_object(ocpl_id)))
-        HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "not a property list")
+    oc_plist = (H5P_genplist_t *)H5I_object(ocpl_id);
+    if(NULL == oc_plist)
+        HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, NULL, "not a property list")
 
     /* Get any object header status flags set by properties */
     if(H5P_get(oc_plist, H5O_CRT_OHDR_FLAGS_NAME, &oh_flags) < 0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get object header flags")
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get object header flags")
 
-    /* Allocate the object header and zero out header fields */
-    if(NULL == (oh = H5FL_CALLOC(H5O_t)))
-        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
+    if(H5O_set_version(f, oh, oh_flags, H5F_STORE_MSG_CRT_IDX(f)) < 0)
+        HGOTO_ERROR(H5E_OHDR, H5E_CANTSET, NULL, "can't set version of object header")
+
+    oh->flags = oh_flags;
+
+    ret_value = oh;
+
+done:
+    if((NULL == ret_value) && (NULL != oh) && (H5O__free(oh) < 0))
+        HDONE_ERROR(H5E_OHDR, H5E_CANTFREE, NULL, "can't delete object header")
+
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* H5O__create_ohdr() */
+
+
+/*-----------------------------------------------------------------------------
+ * Function:   H5O__apply_ohdr
+ *
+ * Purpose:    Initialize and set the object header in the file.
+ *             Record some information at `loc_out`.
+ *
+ * Return:     Success: SUCCEED (0) (non-negative value)
+ *             Failure: FAIL (-1) (negative value)
+ *
+ * Programmer: Jacob Smith
+ *             2018 August 17
+ *
+ *-----------------------------------------------------------------------------
+ */
+herr_t
+H5O__apply_ohdr(H5F_t *f, H5O_t *oh, hid_t ocpl_id, size_t size_hint, size_t initial_rc, H5O_loc_t *loc_out)
+{
+    haddr_t         oh_addr;
+    size_t          oh_size;
+    H5P_genplist_t *oc_plist     = NULL;
+    unsigned        insert_flags = H5AC__NO_FLAGS_SET;
+    herr_t          ret_value    = SUCCEED;
 
-    /* Initialize file-specific information for object header */
-    store_msg_crt_idx = H5F_STORE_MSG_CRT_IDX(f);
+    FUNC_ENTER_NOAPI(FAIL)
 
-    if(H5O_set_version(f, oh, oh_flags, store_msg_crt_idx) < 0)
-        HGOTO_ERROR(H5E_OHDR, H5E_CANTSET, FAIL, "can't set version of objecdt header")
+    HDassert(f);
+    HDassert(loc_out);
+    HDassert(oh);
+    HDassert(TRUE == H5P_isa_class(ocpl_id, H5P_OBJECT_CREATE));
+
+    /* Allocate at least a reasonable size for the object header */
+    size_hint = H5O_ALIGN_F(f, MAX(H5O_MIN_SIZE, size_hint));
 
     oh->sizeof_size = H5F_SIZEOF_SIZE(f);
     oh->sizeof_addr = H5F_SIZEOF_ADDR(f);
-    oh->swmr_write = !!(H5F_INTENT(f) & H5F_ACC_SWMR_WRITE);
+    oh->swmr_write = !!(H5F_INTENT(f) & H5F_ACC_SWMR_WRITE); /* funky cast */
+
 #ifdef H5O_ENABLE_BAD_MESG_COUNT
     /* Check whether the "bad message count" property is set */
-    if(H5P_exist_plist(oc_plist, H5O_BAD_MESG_COUNT_NAME) > 0) {
-        /* Retrieve bad message count flag */
+    if(0 < H5P_exist_plist(oc_plist, H5O_BAD_MESG_COUNT_NAME))
+        /* Get bad message count flag -- from property list */
         if(H5P_get(oc_plist, H5O_BAD_MESG_COUNT_NAME, &oh->store_bad_mesg_count) < 0)
             HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't get bad message count flag")
-    }
 #endif /* H5O_ENABLE_BAD_MESG_COUNT */
 
     /* Create object header proxy if doing SWMR writes */
     if(oh->swmr_write) {
-        /* Create virtual entry, for use as proxy */
-        if(NULL == (oh->proxy = H5AC_proxy_entry_create()))
+        oh->proxy = H5AC_proxy_entry_create();
+        if(NULL == oh->proxy)
             HGOTO_ERROR(H5E_OHDR, H5E_CANTCREATE, FAIL, "can't create object header proxy")
-    }
-    else
+    } else {
         oh->proxy = NULL;
+    }
 
-    /* Set initial status flags */
-    oh->flags = oh_flags;
+    oc_plist = (H5P_genplist_t *)H5I_object(ocpl_id);
+    if(NULL == oc_plist)
+        HGOTO_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "not a property list")
 
     /* Initialize version-specific fields */
     if(oh->version > H5O_VERSION_1) {
-        /* Initialize all time fields with current time, if we are storing them */
+        /* Initialize all time fields */
         if(oh->flags & H5O_HDR_STORE_TIMES)
             oh->atime = oh->mtime = oh->ctime = oh->btime = H5_now();
         else
             oh->atime = oh->mtime = oh->ctime = oh->btime = 0;
 
-        /* Make certain attribute creation order tracking is enabled if
-         *      attributes can be shared in this file.
-         */
-        if(store_msg_crt_idx)
+        if(H5F_STORE_MSG_CRT_IDX(f))
+            /* flag to record message creation indices */
             oh->flags |= H5O_HDR_ATTR_CRT_ORDER_TRACKED;
 
-        /* Retrieve attribute storage phase change values from property list */
+        /* Get attribute storage phase change values -- from property list */
         if(H5P_get(oc_plist, H5O_CRT_ATTR_MAX_COMPACT_NAME, &oh->max_compact) < 0)
             HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get max. # of compact attributes")
         if(H5P_get(oc_plist, H5O_CRT_ATTR_MIN_DENSE_NAME, &oh->min_dense) < 0)
             HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get min. # of dense attributes")
 
         /* Check for non-default attribute storage phase change values */
-        if(oh->max_compact != H5O_CRT_ATTR_MAX_COMPACT_DEF || oh->min_dense != H5O_CRT_ATTR_MIN_DENSE_DEF)
+        if(H5O_CRT_ATTR_MAX_COMPACT_DEF != oh->max_compact  || H5O_CRT_ATTR_MIN_DENSE_DEF != oh->min_dense )
             oh->flags |= H5O_HDR_ATTR_STORE_PHASE_CHANGE;
 
         /* Determine correct value for chunk #0 size bits */
@@ -383,23 +461,25 @@ H5O_create(H5F_t *f, size_t size_hint, size_t initial_rc, hid_t ocpl_id,
             oh->flags |= H5O_HDR_CHUNK0_4;
         else if(size_hint > 255)
             oh->flags |= H5O_HDR_CHUNK0_2;
-    } /* end if */
-    else {
+    } else {
         /* Reset unused time fields */
         oh->atime = oh->mtime = oh->ctime = oh->btime = 0;
-    } /* end else */
+    } /* end if/else header version >1 */
 
     /* Compute total size of initial object header */
     /* (i.e. object header prefix and first chunk) */
     oh_size = (size_t)H5O_SIZEOF_HDR(oh) + size_hint;
 
     /* Allocate disk space for header and first chunk */
-    if(HADDR_UNDEF == (oh_addr = H5MF_alloc(f, H5FD_MEM_OHDR, (hsize_t)oh_size)))
+    oh_addr = H5MF_alloc(f, H5FD_MEM_OHDR, (hsize_t)oh_size);
+    if(HADDR_UNDEF == oh_addr)
         HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "file allocation failed for object header")
 
     /* Create the chunk list */
-    oh->nchunks = oh->alloc_nchunks = 1;
-    if(NULL == (oh->chunk = H5FL_SEQ_MALLOC(H5O_chunk_t, (size_t)oh->alloc_nchunks)))
+    oh->nchunks = 1;
+    oh->alloc_nchunks = 1;
+    oh->chunk = H5FL_SEQ_MALLOC(H5O_chunk_t, (size_t)oh->alloc_nchunks);
+    if(NULL == oh->chunk)
         HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
 
     /* Initialize the first chunk */
@@ -409,25 +489,27 @@ H5O_create(H5F_t *f, size_t size_hint, size_t initial_rc, hid_t ocpl_id,
 
     /* Allocate enough space for the first chunk */
     /* (including space for serializing the object header prefix */
-    if(NULL == (oh->chunk[0].image = H5FL_BLK_CALLOC(chunk_image, oh_size)))
+    oh->chunk[0].image = H5FL_BLK_CALLOC(chunk_image, oh_size);
+    if(NULL == oh->chunk[0].image)
         HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
     oh->chunk[0].chunk_proxy = NULL;
 
     /* Put magic # for object header in first chunk */
-    if(oh->version > H5O_VERSION_1)
+    if(H5O_VERSION_1 < oh->version)
         HDmemcpy(oh->chunk[0].image, H5O_HDR_MAGIC, (size_t)H5_SIZEOF_MAGIC);
 
     /* Create the message list */
     oh->nmesgs = 1;
     oh->alloc_nmesgs = H5O_NMESGS;
-    if(NULL == (oh->mesg = H5FL_SEQ_CALLOC(H5O_mesg_t, oh->alloc_nmesgs)))
+    oh->mesg = H5FL_SEQ_CALLOC(H5O_mesg_t, oh->alloc_nmesgs);
+    if(NULL == oh->mesg)
         HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
 
-    /* Initialize the initial "null" message, covering the entire first chunk */
+    /* Initialize the initial "null" message; covers the entire first chunk */
     oh->mesg[0].type = H5O_MSG_NULL;
     oh->mesg[0].dirty = TRUE;
     oh->mesg[0].native = NULL;
-    oh->mesg[0].raw = oh->chunk[0].image + (H5O_SIZEOF_HDR(oh) - H5O_SIZEOF_CHKSUM_OH(oh)) + H5O_SIZEOF_MSGHDR_OH(oh);
+    oh->mesg[0].raw = oh->chunk[0].image + H5O_SIZEOF_HDR(oh) - H5O_SIZEOF_CHKSUM_OH(oh) + H5O_SIZEOF_MSGHDR_OH(oh);
     oh->mesg[0].raw_size = size_hint - (size_t)H5O_SIZEOF_MSGHDR_OH(oh);
     oh->mesg[0].chunkno = 0;
 
@@ -452,20 +534,15 @@ H5O_create(H5F_t *f, size_t size_hint, size_t initial_rc, hid_t ocpl_id,
     H5_END_TAG
 
     /* Set up object location */
-    loc->file = f;
-    loc->addr = oh_addr;
+    loc_out->file = f;
+    loc_out->addr = oh_addr;
 
-    /* Open it */
-    if(H5O_open(loc) < 0)
+    if(H5O_open(loc_out) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_CANTOPENOBJ, FAIL, "unable to open object header")
 
 done:
-    if(ret_value < 0 && oh)
-        if(H5O__free(oh) < 0)
-            HDONE_ERROR(H5E_OHDR, H5E_CANTFREE, FAIL, "unable to destroy object header data")
-
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5O_create() */
+    FUNC_LEAVE_NOAPI(ret_value);
+} /* H5O__apply_ohdr() */
 
 
 /*-------------------------------------------------------------------------
@@ -1765,7 +1842,6 @@ H5O_get_loc(hid_t object_id)
         case H5I_FILE:
         case H5I_DATASPACE:
         case H5I_ATTR:
-        case H5I_REFERENCE:
         case H5I_VFL:
         case H5I_VOL:
         case H5I_GENPROP_CLS:
@@ -2421,6 +2497,63 @@ H5O_get_oh_addr(const H5O_t *oh)
 
 
 /*-------------------------------------------------------------------------
+ * Function:	H5O_get_oh_flags
+ *
+ * Programmer:	Jacob Smith
+ *		2018 August 17
+ *
+ *-------------------------------------------------------------------------
+ */
+uint8_t
+H5O_get_oh_flags(const H5O_t *oh)
+{
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+    HDassert(oh);
+    FUNC_LEAVE_NOAPI(oh->flags); /* flags can be 0 */
+} /* H5O_get_oh_flags() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5O_get_oh_mtime
+ *
+ * Purpose:	Retrieve an object's modification time. Assumes that the
+ *              caller has verified that accessing this variable is appropriate
+ *              to the header in question.
+ *
+ * Programmer:	Jacob Smith
+ *		2018 August 17
+ *
+ *-------------------------------------------------------------------------
+ */
+time_t
+H5O_get_oh_mtime(const H5O_t *oh)
+{
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+    HDassert(oh);
+    HDassert(oh->mtime);
+    FUNC_LEAVE_NOAPI(oh->mtime);
+} /* H5O_get_oh_mtime() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5O_get_oh_version
+ *
+ * Programmer:	Jacob Smith
+ *		2018 August 17
+ *
+ *-------------------------------------------------------------------------
+ */
+uint8_t
+H5O_get_oh_version(const H5O_t *oh)
+{
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+    HDassert(oh);
+    HDassert(oh->version);
+    FUNC_LEAVE_NOAPI(oh->version);
+} /* H5O_get_oh_version() */
+
+
+/*-------------------------------------------------------------------------
  * Function:	H5O_get_rc_and_type
  *
  * Purpose:	Retrieve an object's reference count and type
diff --git a/src/H5Omessage.c b/src/H5Omessage.c
index d6e3dce..18f3706 100644
--- a/src/H5Omessage.c
+++ b/src/H5Omessage.c
@@ -1598,16 +1598,23 @@ H5O_msg_is_shared(unsigned type_id, const void *mesg)
     FUNC_ENTER_NOAPI_NOINIT_NOERR
 
     /* Check args */
-    HDassert(type_id < NELMTS(H5O_msg_class_g));
-    type = H5O_msg_class_g[type_id];    /* map the type ID to the actual type object */
-    HDassert(type);
-    HDassert(mesg);
-
-    /* If messages in a class aren't sharable, then obviously this message isn't shared! :-) */
-    if(type->share_flags & H5O_SHARE_IS_SHARABLE)
-        ret_value = H5O_IS_STORED_SHARED(((const H5O_shared_t *)mesg)->type);
-    else
+#ifdef H5O_ENABLE_BOGUS
+    if(type_id >= NELMTS(H5O_msg_class_g))
         ret_value = FALSE;
+    else
+#endif /* H5O_ENABLE_BOGUS */
+    {
+        HDassert(type_id < NELMTS(H5O_msg_class_g));
+        type = H5O_msg_class_g[type_id];    /* map the type ID to the actual type object */
+        HDassert(type);
+        HDassert(mesg);
+
+        /* If messages in a class aren't sharable, then obviously this message isn't shared! :-) */
+        if(type->share_flags & H5O_SHARE_IS_SHARABLE)
+            ret_value = H5O_IS_STORED_SHARED(((const H5O_shared_t *)mesg)->type);
+        else
+            ret_value = FALSE;
+    } /* end block/else */
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5O_msg_is_shared() */
diff --git a/src/H5Opkg.h b/src/H5Opkg.h
index dbc8089..668f4f0 100644
--- a/src/H5Opkg.h
+++ b/src/H5Opkg.h
@@ -29,7 +29,7 @@
 #define H5O_NMESGS	8 		/*initial number of messages	     */
 #define H5O_NCHUNKS	2		/*initial number of chunks	     */
 #define H5O_MIN_SIZE	22		/* Min. obj header data size (must be big enough for a message prefix and a continuation message) */
-#define H5O_MSG_TYPES   27              /* # of types of messages            */
+#define H5O_MSG_TYPES   26              /* # of types of messages            */
 #define H5O_MAX_CRT_ORDER_IDX 65535     /* Max. creation order index value   */
 
 /* Versions of object header structure */
diff --git a/src/H5Oprivate.h b/src/H5Oprivate.h
index e8565b9..5987ecf 100644
--- a/src/H5Oprivate.h
+++ b/src/H5Oprivate.h
@@ -121,8 +121,14 @@ typedef struct H5O_mesg_t H5O_mesg_t;
 /* If the module using this macro is allowed access to the private variables, access them directly */
 #ifdef H5O_MODULE
 #define H5O_OH_GET_ADDR(O)    ((O)->chunk[0].addr)
+#define H5O_OH_GET_VERSION(O) ((O)->version)
+#define H5O_OH_GET_FLAGS(O)   ((O)->flags)
+#define H5O_OH_GET_MTIME(O)   ((O)->mtime)
 #else /* H5O_MODULE */
 #define H5O_OH_GET_ADDR(O)    (H5O_get_oh_addr(O))
+#define H5O_OH_GET_VERSION(O) (H5O_get_oh_version(O))
+#define H5O_OH_GET_FLAGS(O)   (H5O_get_oh_flags(O))
+#define H5O_OH_GET_MTIME(O)   (H5O_get_oh_mtime(O))
 #endif /* H5O_MODULE */
 
 /* Set the fields in a shared message structure */
@@ -221,11 +227,11 @@ typedef struct H5O_copy_t {
  * Note: Must increment H5O_MSG_TYPES in H5Opkg.h and update H5O_msg_class_g
  *      in H5O.c when creating a new message type.  Also bump the value of
  *      H5O_BOGUS_INVALID_ID, below, to be one greater than the value of
- *      H5O_UNKNOWN_ID.
+ *      H5O_UNKNOWN_ID, and re-run gen_bogus.c.
  *
  * (this should never exist in a file)
  */
-#define H5O_BOGUS_INVALID_ID	0x001A  /* "Bogus invalid" Message.  */
+#define H5O_BOGUS_INVALID_ID	0x001a  /* "Bogus invalid" Message.  */
 
 /* Shared object message types.
  * Shared objects can be committed, in which case the shared message contains
@@ -645,6 +651,7 @@ typedef struct H5O_layout_t {
  */
 #define H5O_BOGUS_VALUE         0xdeadbeef
 typedef struct H5O_bogus_t {
+    H5O_shared_t        sh_loc;         /* Shared message info (must be first) */
     unsigned u;                         /* Hold the bogus info */
 } H5O_bogus_t;
 #endif /* H5O_ENABLE_BOGUS */
@@ -851,13 +858,6 @@ typedef struct {
     } u;
 } H5O_mesg_operator_t;
 
-/* Types for object optional VOL operations */
-typedef enum H5VL_object_optional_t {
-    H5VL_OBJECT_GET_COMMENT,            /* get object comment                   */
-    H5VL_OBJECT_GET_INFO,               /* get object info                      */
-    H5VL_OBJECT_SET_COMMENT             /* set object comment                   */
-} H5VL_object_optional_t;
-
 /* Typedef for abstract object creation */
 typedef struct {
     H5O_type_t obj_type;        /* Type of object to create */
@@ -872,6 +872,9 @@ struct H5P_genplist_t;
 H5_DLL herr_t H5O_init(void);
 H5_DLL herr_t H5O_create(H5F_t *f, size_t size_hint, size_t initial_rc,
     hid_t ocpl_id, H5O_loc_t *loc/*out*/);
+H5_DLL H5O_t *H5O__create_ohdr(H5F_t *f, hid_t ocpl_id);
+H5_DLL herr_t H5O__apply_ohdr(H5F_t *f, H5O_t *oh, hid_t ocpl_id,
+    size_t size_hint, size_t initial_rc, H5O_loc_t *loc_out);
 H5_DLL herr_t H5O_open(H5O_loc_t *loc);
 H5_DLL void *H5O_open_by_idx(const H5G_loc_t *loc, const char *name,
     H5_index_t idx_type, H5_iter_order_t order, hsize_t n, H5I_type_t *opened_type/*out*/);
@@ -898,6 +901,9 @@ H5_DLL void *H5O_open_name(const H5G_loc_t *loc, const char *name, H5I_type_t *o
 H5_DLL herr_t H5O_get_nlinks(const H5O_loc_t *loc, hsize_t *nlinks);
 H5_DLL void *H5O_obj_create(H5F_t *f, H5O_type_t obj_type, void *crt_info, H5G_loc_t *obj_loc);
 H5_DLL haddr_t H5O_get_oh_addr(const H5O_t *oh);
+H5_DLL uint8_t H5O_get_oh_flags(const H5O_t *oh);
+H5_DLL time_t H5O_get_oh_mtime(const H5O_t *oh);
+H5_DLL uint8_t H5O_get_oh_version(const H5O_t *oh);
 H5_DLL herr_t H5O_get_rc_and_type(const H5O_loc_t *oloc, unsigned *rc, H5O_type_t *otype);
 H5_DLL H5AC_proxy_entry_t *H5O_get_proxy(const H5O_t *oh);
 
diff --git a/src/H5Opublic.h b/src/H5Opublic.h
index da2910d..c868e72 100644
--- a/src/H5Opublic.h
+++ b/src/H5Opublic.h
@@ -150,18 +150,19 @@ typedef enum H5O_mcdt_search_ret_t {
 /* Callback to invoke when completing the search for a matching committed datatype from the committed dtype list */
 typedef H5O_mcdt_search_ret_t (*H5O_mcdt_search_cb_t)(void *op_data);
 
+
 /********************/
 /* Public Variables */
 /********************/
 
 
+/*********************/
+/* Public Prototypes */
+/*********************/
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-/*********************/
-/* Public Prototypes */
-/*********************/
 H5_DLL hid_t H5Oopen(hid_t loc_id, const char *name, hid_t lapl_id);
 H5_DLL hid_t H5Oopen_by_addr(hid_t loc_id, haddr_t addr);
 H5_DLL hid_t H5Oopen_by_idx(hid_t loc_id, const char *group_name,
diff --git a/src/H5PLint.c b/src/H5PLint.c
index bbe71fe..8dec14b 100644
--- a/src/H5PLint.c
+++ b/src/H5PLint.c
@@ -262,7 +262,7 @@ H5PL_load(H5PL_type_t type, const H5PL_key_t *key)
 
     /* Set up the search parameters */
     search_params.type = type;
-    search_params.key.id = key->id;
+    search_params.key = key;
 
     /* Search in the table of already loaded plugin libraries */
     if(H5PL__find_plugin_in_cache(&search_params, &found, &plugin_info) < 0)
@@ -311,6 +311,7 @@ H5PL__open(const char *path, H5PL_type_t type, const H5PL_key_t *key,
     hbool_t *success, const void **plugin_info)
 {
     H5PL_HANDLE             handle = NULL;
+    H5PL_get_plugin_type_t  get_plugin_type = NULL;
     H5PL_get_plugin_info_t  get_plugin_info = NULL;
     herr_t                  ret_value = SUCCEED;
 
@@ -333,12 +334,22 @@ H5PL__open(const char *path, H5PL_type_t type, const H5PL_key_t *key,
         HGOTO_DONE(SUCCEED)
     }
 
+    /* Return a handle for the function H5PLget_plugin_type in the dynamic library.
+     * The plugin library is supposed to define this function.
+     */
+    if (NULL == (get_plugin_type = (H5PL_get_plugin_type_t)H5PL_GET_LIB_FUNC(handle, "H5PLget_plugin_type")))
+        HGOTO_DONE(SUCCEED)
+
     /* Return a handle for the function H5PLget_plugin_info in the dynamic library.
-     * The plugin library is suppose to define this function.
+     * The plugin library is supposed to define this function.
      */
     if (NULL == (get_plugin_info = (H5PL_get_plugin_info_t)H5PL_GET_LIB_FUNC(handle, "H5PLget_plugin_info")))
         HGOTO_DONE(SUCCEED)
 
+    /* Check the plugin type and return if it doesn't match the one passed in */
+    if(type != (H5PL_type_t)(*get_plugin_type)())
+        HGOTO_DONE(SUCCEED)
+
     /* Get the plugin information */
     switch (type) {
         case H5PL_TYPE_FILTER:
@@ -364,7 +375,7 @@ H5PL__open(const char *path, H5PL_type_t type, const H5PL_key_t *key,
 
             /* Get the plugin info */
             if(NULL == (cls = (const H5VL_class_t *)(*get_plugin_info)()))
-                HGOTO_ERROR(H5E_PLUGIN, H5E_CANTGET, FAIL, "can't get VOL driver info from plugin")
+                HGOTO_ERROR(H5E_PLUGIN, H5E_CANTGET, FAIL, "can't get VOL connector info from plugin")
 
             /* Which kind of key are we looking for? */
             if(key->vol.kind == H5VL_GET_CONNECTOR_BY_NAME) {
diff --git a/src/H5PLpath.c b/src/H5PLpath.c
index d53007b..04248b5 100644
--- a/src/H5PLpath.c
+++ b/src/H5PLpath.c
@@ -242,6 +242,7 @@ H5PL__create_path_table(void)
                                          * environment variable or the default.
                                          */
     char        *next_path = NULL;      /* A path tokenized from the paths string */
+    char        *lasts = NULL;          /* Context pointer for strtok_r() call */
     herr_t      ret_value = SUCCEED;    /* Return value */
 
     FUNC_ENTER_PACKAGE
@@ -265,8 +266,7 @@ H5PL__create_path_table(void)
         HGOTO_ERROR(H5E_PLUGIN, H5E_CANTALLOC, FAIL, "can't allocate memory for path copy")
 
     /* Separate the paths and store them */
-    /* XXX: strtok() is not thread-safe */
-    next_path = HDstrtok(paths, H5PL_PATH_SEPARATOR);
+    next_path = HDstrtok_r(paths, H5PL_PATH_SEPARATOR, &lasts);
     while (next_path) {
 
         /* Insert the path into the table */
@@ -274,7 +274,7 @@ H5PL__create_path_table(void)
             HGOTO_ERROR(H5E_PLUGIN, H5E_CANTALLOC, FAIL, "can't insert path: %s", next_path)
 
         /* Get the next path from the environment string */
-        next_path = HDstrtok(NULL, H5PL_PATH_SEPARATOR);
+        next_path = HDstrtok_r(NULL, H5PL_PATH_SEPARATOR, &lasts);
     } /* end while */
 
 done:
@@ -689,7 +689,7 @@ H5PL__find_plugin_in_path(const H5PL_search_params_t *search_params, hbool_t *fo
                 continue;
 
             /* attempt to open the dynamic library as a filter library */
-            if (H5PL__open(path, search_params->type, &(search_params->key), found, plugin_info) < 0)
+            if (H5PL__open(path, search_params->type, search_params->key, found, plugin_info) < 0)
                 HGOTO_ERROR(H5E_PLUGIN, H5E_CANTGET, FAIL, "search in directory failed")
             if (*found)
                 HGOTO_DONE(SUCCEED)
@@ -755,7 +755,7 @@ H5PL__find_plugin_in_path(const H5PL_search_params_t *search_params, hbool_t *fo
                 continue;
 
             /* attempt to open the dynamic library as a filter library */
-            if (H5PL__open(path, search_params->type, &(search_params->key), found, plugin_info) < 0)
+            if (H5PL__open(path, search_params->type, search_params->key, found, plugin_info) < 0)
                 HGOTO_ERROR(H5E_PLUGIN, H5E_CANTGET, FAIL, "search in directory failed")
             if (*found)
                 HGOTO_DONE(SUCCEED)
diff --git a/src/H5PLpkg.h b/src/H5PLpkg.h
index d60da82..8c2367f 100644
--- a/src/H5PLpkg.h
+++ b/src/H5PLpkg.h
@@ -79,6 +79,7 @@
     /* maximum size for expanding env vars */
 #   define H5PL_EXPAND_BUFFER_SIZE 32767
 
+    typedef H5PL_type_t(__cdecl *H5PL_get_plugin_type_t)(void);
     typedef const void *(__cdecl *H5PL_get_plugin_info_t)(void);
 
 #else /* H5_HAVE_WIN32_API */
@@ -105,6 +106,7 @@
     /* Clear error */
 #   define H5PL_CLR_ERROR HERROR(H5E_PLUGIN, H5E_CANTGET, "can't dlopen:%s", dlerror())
 
+    typedef H5PL_type_t(*H5PL_get_plugin_type_t)(void);
     typedef const void *(*H5PL_get_plugin_info_t)(void);
 #endif /* H5_HAVE_WIN32_API */
 
@@ -116,7 +118,7 @@
 /* Data used to search for plugins */
 typedef struct H5PL_search_params_t {
     H5PL_type_t         type;
-    H5PL_key_t          key;
+    const H5PL_key_t   *key;
 } H5PL_search_params_t;
 
 
diff --git a/src/H5PLplugin_cache.c b/src/H5PLplugin_cache.c
index 7fe676d..cd0b4d6 100644
--- a/src/H5PLplugin_cache.c
+++ b/src/H5PLplugin_cache.c
@@ -276,7 +276,7 @@ H5PL__find_plugin_in_cache(const H5PL_search_params_t *search_params, hbool_t *f
     for (u = 0; u < H5PL_num_plugins_g; u++) {
 
         /* If the plugin type (filter, etc.) and ID match, query the plugin for its info */
-        if ((search_params->type == (H5PL_cache_g[u]).type) && (search_params->key.id == (H5PL_cache_g[u]).key.id)) {
+        if ((search_params->type == (H5PL_cache_g[u]).type) && (search_params->key->id == (H5PL_cache_g[u]).key.id)) {
 
             H5PL_get_plugin_info_t      get_plugin_info_function;
             const H5Z_class2_t          *filter_info;
diff --git a/src/H5Pdcpl.c b/src/H5Pdcpl.c
index a5a16bb..b85f105 100644
--- a/src/H5Pdcpl.c
+++ b/src/H5Pdcpl.c
@@ -117,6 +117,11 @@
 #define H5D_CRT_EXT_FILE_LIST_COPY H5P__dcrt_ext_file_list_copy
 #define H5D_CRT_EXT_FILE_LIST_CMP  H5P__dcrt_ext_file_list_cmp
 #define H5D_CRT_EXT_FILE_LIST_CLOSE H5P__dcrt_ext_file_list_close
+/* Definitions for dataset object header minimization */
+#define H5D_CRT_MIN_DSET_HDR_SIZE_SIZE sizeof(hbool_t)
+#define H5D_CRT_MIN_DSET_HDR_SIZE_DEF  FALSE
+#define H5D_CRT_MIN_DSET_HDR_SIZE_ENC  H5P__encode_hbool_t
+#define H5D_CRT_MIN_DSET_HDR_SIZE_DEC  H5P__decode_hbool_t
 
 
 /******************/
@@ -209,6 +214,7 @@ static const H5O_layout_t H5D_def_layout_g = H5D_CRT_LAYOUT_DEF;        /* Defau
 static const H5O_fill_t H5D_def_fill_g = H5D_CRT_FILL_VALUE_DEF;        /* Default fill value */
 static const unsigned H5D_def_alloc_time_state_g = H5D_CRT_ALLOC_TIME_STATE_DEF;  /* Default allocation time state */
 static const H5O_efl_t H5D_def_efl_g = H5D_CRT_EXT_FILE_LIST_DEF;                 /* Default external file list */
+static const unsigned H5O_ohdr_min_g = H5D_CRT_MIN_DSET_HDR_SIZE_DEF; /* Default object header minimization */
 
 /* Defaults for each type of layout */
 #ifdef H5_HAVE_C99_DESIGNATED_INITIALIZER
@@ -271,6 +277,12 @@ H5P__dcrt_reg_prop(H5P_genclass_t *pclass)
             H5D_CRT_EXT_FILE_LIST_DEL, H5D_CRT_EXT_FILE_LIST_COPY, H5D_CRT_EXT_FILE_LIST_CMP, H5D_CRT_EXT_FILE_LIST_CLOSE) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class")
 
+    /* Register the object header minimization property */
+    if(H5P__register_real(pclass, H5D_CRT_MIN_DSET_HDR_SIZE_NAME, H5D_CRT_MIN_DSET_HDR_SIZE_SIZE, &H5O_ohdr_min_g,
+            NULL, NULL, NULL, H5D_CRT_MIN_DSET_HDR_SIZE_ENC, H5D_CRT_MIN_DSET_HDR_SIZE_DEC,
+            NULL, NULL, NULL, NULL) < 0)
+       HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class")
+
     /* Register the type ID property*/
     if(H5P__register_real(pclass, H5VL_PROP_DSET_TYPE_ID, sizeof(hid_t), &type_id, 
                          NULL, NULL, NULL, NULL, NULL, NULL, NULL, H5P_ignore_cmp, NULL) < 0)
@@ -3749,3 +3761,95 @@ done:
     FUNC_LEAVE_API(ret_value)
 } /* end H5Pget_fill_time() */
 
+
+/*-----------------------------------------------------------------------------
+ * Function: H5Pget_dset_no_attrs_hint
+ *
+ * Purpose:
+ *
+ *     Access the flag for whether or not datasets created by the given dcpl
+ *     will be created with a "minimized" object header.
+ *
+ * Return:
+ *
+ *     Failure: Negative value (FAIL)
+ *     Success: Non-negative value (SUCCEED)
+ *
+ * Programmer: Jacob Smith
+ *             2018 August 14
+ *
+ * Modifications: None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+herr_t
+H5Pget_dset_no_attrs_hint(hid_t dcpl_id, hbool_t *minimize)
+{
+    hbool_t         setting   = FALSE;
+    H5P_genplist_t *plist     = NULL;
+    herr_t          ret_value = SUCCEED;
+
+    FUNC_ENTER_API(FAIL)
+    H5TRACE2("e", "i*b", dcpl_id, minimize);
+
+    if(NULL == minimize)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "receiving pointer cannot be NULL")
+
+    plist = H5P_object_verify(dcpl_id, H5P_DATASET_CREATE);
+    if(NULL == plist)
+        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID")
+
+    if(H5P_peek(plist, H5D_CRT_MIN_DSET_HDR_SIZE_NAME, &setting) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get dset oh minimize flag value")
+
+    *minimize = setting;
+
+done:
+    FUNC_LEAVE_API(ret_value)
+} /* H5Pget_dset_no_attrs_hint() */
+
+
+/*-----------------------------------------------------------------------------
+ * Function: H5Pset_dset_no_attrs_hint
+ *
+ * Purpose:
+ *
+ *     Set the dcpl to minimize (or explicitly to not minimized) dataset object
+ *     headers upon creation.
+ *
+ * Return:
+ *
+ *     Failure: Negative value (FAIL)
+ *     Success: Non-negative value (SUCCEED)
+ *
+ * Programmer: Jacob Smith
+ *             2018 August 14
+ *
+ * Modifications: None.
+ *
+ *-----------------------------------------------------------------------------
+ */
+herr_t
+H5Pset_dset_no_attrs_hint(hid_t dcpl_id, hbool_t minimize)
+{
+    H5P_genplist_t *plist     = NULL;
+    hbool_t         prev_set  = FALSE;
+    herr_t          ret_value = SUCCEED;
+
+    FUNC_ENTER_API(FAIL)
+    H5TRACE2("e", "ib", dcpl_id, minimize);
+
+    plist = H5P_object_verify(dcpl_id, H5P_DATASET_CREATE);
+    if(NULL == plist)
+        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID")
+
+    if(H5P_peek(plist, H5D_CRT_MIN_DSET_HDR_SIZE_NAME, &prev_set) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get extant dset oh minimize flag value")
+
+    if(H5P_poke(plist, H5D_CRT_MIN_DSET_HDR_SIZE_NAME, &minimize) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't get dset oh minimize flag value")
+
+done:
+    FUNC_LEAVE_API(ret_value)
+} /* H5Pset_dset_no_attrs_hint() */
+
diff --git a/src/H5Pdxpl.c b/src/H5Pdxpl.c
index bfc1d93..8338d84 100644
--- a/src/H5Pdxpl.c
+++ b/src/H5Pdxpl.c
@@ -2017,6 +2017,7 @@ done:
     FUNC_LEAVE_API(ret_value)
 } /* end H5Pget_mpio_actual_io_mode() */
 
+
 /*-------------------------------------------------------------------------
  * Function:	H5Pget_mpio_no_collective_cause
  *
@@ -2053,8 +2054,6 @@ H5Pget_mpio_no_collective_cause(hid_t plist_id, uint32_t *local_no_collective_ca
 done:
     FUNC_LEAVE_API(ret_value)
 } /* end H5Pget_mpio_no_collective_cause() */
-
-
 #endif /* H5_HAVE_PARALLEL */
 
 
diff --git a/src/H5Pfapl.c b/src/H5Pfapl.c
index 923c792..452ea3f 100644
--- a/src/H5Pfapl.c
+++ b/src/H5Pfapl.c
@@ -49,7 +49,7 @@
 #endif
 
 /* Includes needed to set default VOL connector */
-#include "H5VLnative.h"         /* Native VOL connector                 */
+#include "H5VLnative_private.h" /* Native VOL connector                     */
 
 
 /****************/
@@ -177,16 +177,6 @@
 #define H5F_ACS_FILE_IMAGE_INFO_COPY            H5P__facc_file_image_info_copy
 #define H5F_ACS_FILE_IMAGE_INFO_CMP             H5P__facc_file_image_info_cmp
 #define H5F_ACS_FILE_IMAGE_INFO_CLOSE           H5P__facc_file_image_info_close
-/* Definition of core VFD write tracking flag */
-#define H5F_ACS_CORE_WRITE_TRACKING_FLAG_SIZE   sizeof(hbool_t)
-#define H5F_ACS_CORE_WRITE_TRACKING_FLAG_DEF    FALSE
-#define H5F_ACS_CORE_WRITE_TRACKING_FLAG_ENC    H5P__encode_hbool_t
-#define H5F_ACS_CORE_WRITE_TRACKING_FLAG_DEC    H5P__decode_hbool_t
-/* Definition of core VFD write tracking page size */
-#define H5F_ACS_CORE_WRITE_TRACKING_PAGE_SIZE_SIZE      sizeof(size_t)
-#define H5F_ACS_CORE_WRITE_TRACKING_PAGE_SIZE_DEF       524288
-#define H5F_ACS_CORE_WRITE_TRACKING_PAGE_SIZE_ENC       H5P__encode_size_t
-#define H5F_ACS_CORE_WRITE_TRACKING_PAGE_SIZE_DEC       H5P__decode_size_t
 /* Definition for # of metadata read attempts */
 #define H5F_ACS_METADATA_READ_ATTEMPTS_SIZE    sizeof(unsigned)
 #define H5F_ACS_METADATA_READ_ATTEMPTS_DEF         0
@@ -401,8 +391,6 @@ static const H5F_libver_t H5F_def_libver_high_bound_g = H5F_ACS_LIBVER_HIGH_BOUN
 static const hbool_t H5F_def_want_posix_fd_g = H5F_ACS_WANT_POSIX_FD_DEF;          /* Default setting for retrieving 'handle' from core VFD */
 static const unsigned H5F_def_efc_size_g = H5F_ACS_EFC_SIZE_DEF;                   /* Default external file cache size */
 static const H5FD_file_image_info_t H5F_def_file_image_info_g = H5F_ACS_FILE_IMAGE_INFO_DEF;                 /* Default file image info and callbacks */
-static const hbool_t H5F_def_core_write_tracking_flag_g = H5F_ACS_CORE_WRITE_TRACKING_FLAG_DEF;              /* Default setting for core VFD write tracking */
-static const size_t H5F_def_core_write_tracking_page_size_g = H5F_ACS_CORE_WRITE_TRACKING_PAGE_SIZE_DEF;     /* Default core VFD write tracking page size */
 static const unsigned H5F_def_metadata_read_attempts_g = H5F_ACS_METADATA_READ_ATTEMPTS_DEF;  /* Default setting for the # of metadata read attempts */
 static const H5F_object_flush_t H5F_def_object_flush_cb_g = H5F_ACS_OBJECT_FLUSH_CB_DEF;      /* Default setting for object flush callback */
 static const hbool_t H5F_def_clear_status_flags_g = H5F_ACS_CLEAR_STATUS_FLAGS_DEF;           /* Default to clear the superblock status_flags */
@@ -572,18 +560,6 @@ H5P__facc_reg_prop(H5P_genclass_t *pclass)
             H5F_ACS_FILE_IMAGE_INFO_DEL, H5F_ACS_FILE_IMAGE_INFO_COPY, H5F_ACS_FILE_IMAGE_INFO_CMP, H5F_ACS_FILE_IMAGE_INFO_CLOSE) < 0)
         HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class")
 
-    /* Register the core VFD backing store write tracking flag */
-    if(H5P__register_real(pclass, H5F_ACS_CORE_WRITE_TRACKING_FLAG_NAME, H5F_ACS_CORE_WRITE_TRACKING_FLAG_SIZE, &H5F_def_core_write_tracking_flag_g,
-            NULL, NULL, NULL, H5F_ACS_CORE_WRITE_TRACKING_FLAG_ENC, H5F_ACS_CORE_WRITE_TRACKING_FLAG_DEC,
-            NULL, NULL, NULL, NULL) < 0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class")
-
-    /* Register the size of the core VFD backing store page size */
-    if(H5P__register_real(pclass, H5F_ACS_CORE_WRITE_TRACKING_PAGE_SIZE_NAME, H5F_ACS_CORE_WRITE_TRACKING_PAGE_SIZE_SIZE, &H5F_def_core_write_tracking_page_size_g,
-            NULL, NULL, NULL, H5F_ACS_CORE_WRITE_TRACKING_PAGE_SIZE_ENC, H5F_ACS_CORE_WRITE_TRACKING_PAGE_SIZE_DEC,
-            NULL, NULL, NULL, NULL) < 0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class")
-
     /* Register the # of read attempts */
     if(H5P__register_real(pclass, H5F_ACS_METADATA_READ_ATTEMPTS_NAME, H5F_ACS_METADATA_READ_ATTEMPTS_SIZE, &H5F_def_metadata_read_attempts_g,
             NULL, NULL, NULL, H5F_ACS_METADATA_READ_ATTEMPTS_ENC, H5F_ACS_METADATA_READ_ATTEMPTS_DEC,
@@ -3957,89 +3933,6 @@ H5P__facc_libver_type_dec(const void **_pp, void *_value)
     FUNC_LEAVE_NOAPI(SUCCEED)
 } /* end H5P__facc_libver_type_dec() */
 
-
-/*-------------------------------------------------------------------------
- * Function:    H5Pset_core_write_tracking
- *
- * Purpose:    Enables/disables core VFD write tracking and page
- *              aggregation size.
- *
- * Return:    Non-negative on success/Negative on failure
- *
- * Programmer:  Dana Robinson
- *              Tuesday, April 8, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5Pset_core_write_tracking(hid_t plist_id, hbool_t is_enabled, size_t page_size)
-{
-    H5P_genplist_t *plist;        /* Property list pointer */
-    herr_t ret_value = SUCCEED;   /* return value */
-
-    FUNC_ENTER_API(FAIL)
-    H5TRACE3("e", "ibz", plist_id, is_enabled, page_size);
-
-    /* The page size cannot be zero */
-    if(page_size == 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "page_size cannot be zero")
-
-    /* Get the plist structure */
-    if(NULL == (plist = H5P_object_verify(plist_id, H5P_FILE_ACCESS)))
-        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID")
-
-    /* Set values */
-    if(H5P_set(plist, H5F_ACS_CORE_WRITE_TRACKING_FLAG_NAME, &is_enabled) < 0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set core VFD write tracking flag")
-    if(H5P_set(plist, H5F_ACS_CORE_WRITE_TRACKING_PAGE_SIZE_NAME, &page_size) < 0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set core VFD write tracking page size")
-
-done:
-    FUNC_LEAVE_API(ret_value)
-} /* end H5Pset_core_write_tracking() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5Pget_core_write_tracking
- *
- * Purpose:    Gets information about core VFD write tracking and page
- *              aggregation size.
- *
- * Return:    Non-negative on success/Negative on failure
- *
- * Programmer:  Dana Robinson
- *              Tuesday, April 8, 2014
- *
- *-------------------------------------------------------------------------
- */
-herr_t
-H5Pget_core_write_tracking(hid_t plist_id, hbool_t *is_enabled, size_t *page_size)
-{
-    H5P_genplist_t *plist;      /* Property list pointer */
-    herr_t ret_value = SUCCEED;   /* return value */
-
-    FUNC_ENTER_API(FAIL)
-    H5TRACE3("e", "i*b*z", plist_id, is_enabled, page_size);
-
-    /* Get the plist structure */
-    if(NULL == (plist = H5P_object_verify(plist_id, H5P_FILE_ACCESS)))
-        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID")
-
-    /* Get values */
-    if(is_enabled) {
-        if(H5P_get(plist, H5F_ACS_CORE_WRITE_TRACKING_FLAG_NAME, is_enabled) < 0)
-            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get core VFD write tracking flag")
-    } /* end if */
-
-    if(page_size) {
-        if(H5P_get(plist, H5F_ACS_CORE_WRITE_TRACKING_PAGE_SIZE_NAME, page_size) < 0)
-            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get core VFD write tracking page size")
-    } /* end if */
-
-done:
-    FUNC_LEAVE_API(ret_value)
-} /* end H5Pget_core_write_tracking() */
-
 
 /*-------------------------------------------------------------------------
  * Function:    H5Pset_metadata_read_attempts
diff --git a/src/H5Ppublic.h b/src/H5Ppublic.h
index 86c6687..078fe74 100644
--- a/src/H5Ppublic.h
+++ b/src/H5Ppublic.h
@@ -167,7 +167,8 @@ typedef enum H5D_mpio_no_collective_cause_t {
     H5D_MPIO_NOT_SIMPLE_OR_SCALAR_DATASPACES = 0x10,
     H5D_MPIO_NOT_CONTIGUOUS_OR_CHUNKED_DATASET = 0x20,
     H5D_MPIO_PARALLEL_FILTERED_WRITES_DISABLED = 0x40,
-    H5D_MPIO_NO_COLLECTIVE_MAX_CAUSE = 0x80
+    H5D_MPIO_ERROR_WHILE_CHECKING_COLLECTIVE_POSSIBLE = 0x80,
+    H5D_MPIO_NO_COLLECTIVE_MAX_CAUSE = 0x100
 } H5D_mpio_no_collective_cause_t;
 
 /********************/
@@ -412,6 +413,8 @@ H5_DLL herr_t H5Pget_alloc_time(hid_t plist_id, H5D_alloc_time_t
 H5_DLL herr_t H5Pset_fill_time(hid_t plist_id, H5D_fill_time_t fill_time);
 H5_DLL herr_t H5Pget_fill_time(hid_t plist_id, H5D_fill_time_t
     *fill_time/*out*/);
+H5_DLL herr_t H5Pget_dset_no_attrs_hint(hid_t dcpl_id, hbool_t *minimize);
+H5_DLL herr_t H5Pset_dset_no_attrs_hint(hid_t dcpl_id, hbool_t minimize);
 
 /* Dataset access property list (DAPL) routines */
 H5_DLL herr_t H5Pset_chunk_cache(hid_t dapl_id, size_t rdcc_nslots,
diff --git a/src/H5R.c b/src/H5R.c
index b7866b1..7d3686e 100644
--- a/src/H5R.c
+++ b/src/H5R.c
@@ -127,7 +127,7 @@ H5Rcreate(void *ref, hid_t loc_id, const char *name, H5R_type_t ref_type, hid_t
         HGOTO_ERROR(H5E_REFERENCE, H5E_CANTSET, FAIL, "can't set access property list info")
 
     /* Create reference */
-    if((ret_value = H5VL_object_specific(vol_obj, &loc_params, H5VL_REF_CREATE, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, ref, name, ref_type, space_id)) < 0)
+    if((ret_value = H5VL_object_specific(vol_obj, &loc_params, H5VL_REF_CREATE, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, ref, name, (int)ref_type, space_id)) < 0)
         HGOTO_ERROR(H5E_REFERENCE, H5E_CANTCREATE, FAIL, "unable to create reference")
 
 done:
@@ -257,7 +257,7 @@ H5Rget_region(hid_t id, H5R_type_t ref_type, const void *ref)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, H5I_INVALID_HID, "invalid file identifier")
 
     /* Get the dataspace with the correct region selected */
-    if(H5VL_object_get(vol_obj, &loc_params, H5VL_REF_GET_REGION, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, &ret_value, ref_type, ref) < 0)
+    if(H5VL_object_get(vol_obj, &loc_params, H5VL_REF_GET_REGION, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, &ret_value, (int)ref_type, ref) < 0)
         HGOTO_ERROR(H5E_REFERENCE, H5E_CANTGET, H5I_INVALID_HID, "unable to retrieve dataspace")
 
 done:
@@ -314,7 +314,7 @@ H5Rget_obj_type2(hid_t id, H5R_type_t ref_type, const void *ref,
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid file identifier")
 
     /* Get the object type */
-    if(H5VL_object_get(vol_obj, &loc_params, H5VL_REF_GET_TYPE, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, obj_type, ref_type, ref) < 0)
+    if(H5VL_object_get(vol_obj, &loc_params, H5VL_REF_GET_TYPE, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, obj_type, (int)ref_type, ref) < 0)
         HGOTO_ERROR(H5E_REFERENCE, H5E_CANTGET, FAIL, "unable to determine object type")
 
 done:
@@ -381,7 +381,7 @@ H5Rget_name(hid_t id, H5R_type_t ref_type, const void *_ref, char *name,
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, (-1), "invalid file identifier")
 
     /* Get name */
-    if(H5VL_object_get(vol_obj, &loc_params, H5VL_REF_GET_NAME, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, &ret_value, name, size, ref_type, _ref) < 0)
+    if(H5VL_object_get(vol_obj, &loc_params, H5VL_REF_GET_NAME, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, &ret_value, name, size, (int)ref_type, _ref) < 0)
         HGOTO_ERROR(H5E_REFERENCE, H5E_CANTGET, (-1), "unable to determine object path")
 
 done:
diff --git a/src/H5Rdeprec.c b/src/H5Rdeprec.c
index 827506e..ab8d3b4 100644
--- a/src/H5Rdeprec.c
+++ b/src/H5Rdeprec.c
@@ -126,7 +126,7 @@ H5Rget_obj_type1(hid_t id, H5R_type_t ref_type, const void *ref)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, H5G_UNKNOWN, "invalid file identifier")
 
     /* Get the object information */
-    if(H5VL_object_get(vol_obj, &loc_params, H5VL_REF_GET_TYPE, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, &obj_type, ref_type, ref) < 0)
+    if(H5VL_object_get(vol_obj, &loc_params, H5VL_REF_GET_TYPE, H5P_DATASET_XFER_DEFAULT, H5_REQUEST_NULL, &obj_type, (int)ref_type, ref) < 0)
         HGOTO_ERROR(H5E_REFERENCE, H5E_CANTGET, H5G_UNKNOWN, "unable to determine object type")
 
     /* Set return value */
diff --git a/src/H5Rint.c b/src/H5Rint.c
index 365facd..a4f76ce 100644
--- a/src/H5Rint.c
+++ b/src/H5Rint.c
@@ -62,18 +62,6 @@ hbool_t H5_PKG_INIT_VAR = FALSE;
 /* Local Variables */
 /*******************/
 
-/* Reference ID class
- *
- * NOTE: H5I_REFERENCE is not used by the library and has been deprecated
- *       with a tentative removal version of 1.12.0. (DER, July 2017)
- */
-static const H5I_class_t H5I_REFERENCE_CLS[1] = {{
-    H5I_REFERENCE,          /* ID class value                                       */
-    0,                      /* Class flags                                          */
-    0,                      /* # of reserved IDs for class                          */
-    NULL                    /* Callback routine for closing objects of this class   */
-}};
-
 /* Flag indicating "top" of interface has been initialized */
 static hbool_t H5R_top_package_initialize_s = FALSE;
 
@@ -97,11 +85,7 @@ H5R__init_package(void)
 
     FUNC_ENTER_NOAPI_NOINIT
 
-    /* Initialize the atom group for the file IDs */
-    if (H5I_register_type(H5I_REFERENCE_CLS) < 0)
-        HGOTO_ERROR(H5E_REFERENCE, H5E_CANTINIT, FAIL, "unable to initialize interface")
-
-    /* Mark "top" of interface as initialized, too */
+    /* Mark "top" of interface as initialized */
     H5R_top_package_initialize_s = TRUE;
 
 done:
@@ -134,16 +118,10 @@ H5R_top_term_package(void)
 
     FUNC_ENTER_NOAPI_NOINIT_NOERR
 
-    if (H5R_top_package_initialize_s) {
-        if (H5I_nmembers(H5I_REFERENCE) > 0) {
-            (void)H5I_clear_type(H5I_REFERENCE, FALSE, FALSE);
-            n++;
-	    }
-
-        /* Mark closed */
-        if (0 == n)
+    /* Mark closed if initialized */
+    if(H5R_top_package_initialize_s)
+        if(0 == n)
             H5R_top_package_initialize_s = FALSE;
-    }
 
     FUNC_LEAVE_NOAPI(n)
 } /* end H5R_top_term_package() */
@@ -176,16 +154,12 @@ H5R_term_package(void)
 
     FUNC_ENTER_NOAPI_NOINIT_NOERR
 
-    if (H5_PKG_INIT_VAR) {
+    if(H5_PKG_INIT_VAR) {
         /* Sanity checks */
-        HDassert(0 == H5I_nmembers(H5I_REFERENCE));
         HDassert(FALSE == H5R_top_package_initialize_s);
 
-        /* Destroy the reference id group */
-        n += (H5I_dec_type_ref(H5I_REFERENCE) > 0);
-
         /* Mark closed */
-        if (0 == n)
+        if(0 == n)
             H5_PKG_INIT_VAR = FALSE;
     }
 
diff --git a/src/H5S.c b/src/H5S.c
index 4c11268..2faf540 100644
--- a/src/H5S.c
+++ b/src/H5S.c
@@ -237,26 +237,25 @@ H5S_get_validated_dataspace(hid_t space_id, const H5S_t **space)
 
     HDassert(space);
 
-    if (space_id < 0)
+    /* Check for invalid ID */
+    if(space_id < 0)
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid space_id (ID cannot be a negative number)")
  
-    if (H5S_ALL == space_id) {
-        /* No special dataspace struct for H5S_ALL */
+    /* No special dataspace struct for H5S_ALL */
+    if(H5S_ALL == space_id)
         *space = NULL;
-    }
     else {
         /* Get the dataspace pointer */
-        if (NULL == (*space = (const H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))
+        if(NULL == (*space = (const H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))
             HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "space_id is not a dataspace ID")
 
         /* Check for valid selection */
-        if (H5S_SELECT_VALID(*space) != TRUE)
+        if(H5S_SELECT_VALID(*space) != TRUE)
             HGOTO_ERROR(H5E_DATASPACE, H5E_BADRANGE, FAIL, "selection + offset not within extent")
-    }
+    } /* end else */
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
-
 } /* end H5S_get_validated_dataspace() */
 
 
diff --git a/src/H5Shyper.c b/src/H5Shyper.c
index ed3fa45..88c570d 100644
--- a/src/H5Shyper.c
+++ b/src/H5Shyper.c
@@ -278,11 +278,8 @@ H5S__hyper_print_diminfo(FILE *f, const H5S_t *space)
 static herr_t
 H5S__hyper_iter_init(H5S_sel_iter_t *iter, const H5S_t *space)
 {
-    const H5S_hyper_dim_t *tdiminfo;    /* Temporary pointer to diminfo information */
-    H5S_hyper_span_info_t *spans;   /* Pointer to hyperslab span info node */
     unsigned rank;                  /* Dataspace's dimension rank */
     unsigned u;                     /* Index variable */
-    int i;                          /* Index variable */
 
     FUNC_ENTER_STATIC_NOERR
 
@@ -298,16 +295,16 @@ H5S__hyper_iter_init(H5S_sel_iter_t *iter, const H5S_t *space)
     /* Get the rank of the dataspace */
     rank = space->extent.rank;
 
-    /* Set the temporary pointer to the dimension information */
-    tdiminfo = space->select.sel_info.hslab->opt_diminfo;
-
     /* Check for the special case of just one H5Sselect_hyperslab call made */
     if(space->select.sel_info.hslab->diminfo_valid) {
 /* Initialize the information needed for regular hyperslab I/O */
+        const H5S_hyper_dim_t *tdiminfo;    /* Temporary pointer to diminfo information */
         const hsize_t *mem_size;    /* Temporary pointer to dataspace extent's dimension sizes */
-        hsize_t acc;                /* Accumulator for "flattened" dimension's sizes */
         unsigned cont_dim = 0;      /* # of contiguous dimensions */
 
+        /* Set the temporary pointer to the dimension information */
+        tdiminfo = space->select.sel_info.hslab->opt_diminfo;
+
         /* Set the temporary pointer to the dataspace extent's dimension sizes */
         mem_size = space->extent.size;
 
@@ -336,9 +333,11 @@ H5S__hyper_iter_init(H5S_sel_iter_t *iter, const H5S_t *space)
 
         /* Check if the regular selection can be "flattened" */
         if(cont_dim > 0) {
+            hsize_t acc;                /* Accumulator for "flattened" dimension's sizes */
             unsigned last_dim_flattened = 1;    /* Flag to indicate that the last dimension was flattened */
             unsigned flat_rank = rank-cont_dim; /* Number of dimensions after flattening */
             unsigned curr_dim;                  /* Current dimension */
+            int i;                      /* Index variable */
 
             /* Set the iterator's rank to the contiguous dimensions */
             iter->u.hyp.iter_rank = flat_rank;
@@ -416,6 +415,8 @@ H5S__hyper_iter_init(H5S_sel_iter_t *iter, const H5S_t *space)
         iter->u.hyp.spans = NULL;
     } /* end if */
     else {
+        H5S_hyper_span_info_t *spans;   /* Pointer to hyperslab span info node */
+
 /* Initialize the information needed for non-regular hyperslab I/O */
         HDassert(space->select.sel_info.hslab->span_lst);
         /* Make a copy of the span tree to iterate over */
@@ -1443,70 +1444,65 @@ H5S__hyper_cmp_spans(const H5S_hyper_span_info_t *span_info1, const H5S_hyper_sp
 
     FUNC_ENTER_STATIC_NOERR
 
-    /* Check for redundant comparison */
+    /* Check for redundant comparison (or both spans being NULL) */
     if(span_info1 == span_info2)
         ret_value = TRUE;
     else {
-        const H5S_hyper_span_t *span1;
-        const H5S_hyper_span_t *span2;
-
-        /* Check for both spans being NULL */
-        if(span_info1 == NULL && span_info2 == NULL)
-            ret_value = TRUE;
+        /* Check for one span being NULL */
+        if(span_info1 == NULL || span_info2 == NULL)
+            ret_value = FALSE;
         else {
-            /* Check for one span being NULL */
-            if(span_info1 == NULL || span_info2 == NULL)
-                ret_value = FALSE;
-            else {
-                /* Get the pointers to the actual lists of spans */
-                span1 = span_info1->head;
-                span2 = span_info2->head;
-
-                /* Sanity checking */
-                HDassert(span1);
-                HDassert(span2);
-
-                /* infinite loop which must be broken out of */
-                while(1) {
-                    /* Check for both spans being NULL */
-                    if(span1 == NULL && span2 == NULL) {
-                        ret_value = TRUE;
+            const H5S_hyper_span_t *span1;
+            const H5S_hyper_span_t *span2;
+
+            /* Get the pointers to the actual lists of spans */
+            span1 = span_info1->head;
+            span2 = span_info2->head;
+
+            /* Sanity checking */
+            HDassert(span1);
+            HDassert(span2);
+
+            /* infinite loop which must be broken out of */
+            while(1) {
+                /* Check for both spans being NULL */
+                if(span1 == NULL && span2 == NULL) {
+                    ret_value = TRUE;
+                    break;
+                } /* end if */
+                else {
+                    /* Check for one span being NULL */
+                    if(span1 == NULL || span2 == NULL) {
+                        ret_value = FALSE;
                         break;
                     } /* end if */
                     else {
-                        /* Check for one span being NULL */
-                        if(span1 == NULL || span2 == NULL) {
+                        /* Check if the actual low & high span information is the same */
+                        if(span1->low != span2->low || span1->high != span2->high) {
                             ret_value = FALSE;
                             break;
                         } /* end if */
                         else {
-                            /* Check if the actual low & high span information is the same */
-                            if(span1->low != span2->low || span1->high != span2->high) {
-                                ret_value = FALSE;
-                                break;
-                            } /* end if */
-                            else {
-                                if(span1->down != NULL || span2 != NULL) {
-                                    if(!H5S__hyper_cmp_spans(span1->down, span2->down)) {
-                                        ret_value = FALSE;
-                                        break;
-                                    } /* end if */
-                                    else {
-                                        /* Keep going... */
-                                    } /* end else */
+                            if(span1->down != NULL || span2 != NULL) {
+                                if(!H5S__hyper_cmp_spans(span1->down, span2->down)) {
+                                    ret_value = FALSE;
+                                    break;
                                 } /* end if */
                                 else {
                                     /* Keep going... */
                                 } /* end else */
+                            } /* end if */
+                            else {
+                                /* Keep going... */
                             } /* end else */
                         } /* end else */
                     } /* end else */
+                } /* end else */
 
-                    /* Advance to the next nodes in the span list */
-                    span1 = span1->next;
-                    span2 = span2->next;
-                } /* end while */
-            } /* end else */
+                /* Advance to the next nodes in the span list */
+                span1 = span1->next;
+                span2 = span2->next;
+            } /* end while */
         } /* end else */
     } /* end else */
 
@@ -2368,17 +2364,17 @@ H5S__hyper_deserialize(H5S_t *space, uint32_t H5_ATTR_UNUSED version, uint8_t fl
         hsize_t *tstart;	/* Temporary hyperslab pointers */
         hsize_t *tend;		/* Temporary hyperslab pointers */
         hsize_t *tblock;	/* Temporary hyperslab pointers */
-        size_t num_elem;      	/* Number of elements in selection */
+        size_t block_count;     /* Number of blocks in selection */
         unsigned v;            	/* Local counting variable */
 
-        /* Decode the number of points */
-        UINT32DECODE(pp, num_elem);
+        /* Decode the number of blocks */
+        UINT32DECODE(pp, block_count);
 
         /* Set the count & stride for all blocks */
         stride = count = H5S_hyper_ones_g;
 
         /* Retrieve the coordinates from the buffer */
-        for(u = 0; u < num_elem; u++) {
+        for(u = 0; u < block_count; u++) {
             /* Decode the starting points */
             for(tstart = start, v = 0; v < rank; v++, tstart++)
                 UINT32DECODE(pp, *tstart);
@@ -3283,10 +3279,9 @@ H5S__hyper_is_single(const H5S_t *space)
          */
 
         /* Check for a single block */
-        for(u = 0; u < space->extent.rank; u++) {
+        for(u = 0; u < space->extent.rank; u++)
             if(space->select.sel_info.hslab->opt_diminfo[u].count > 1)
                 HGOTO_DONE(FALSE)
-        } /* end for */
     } /* end if */
     else {
         H5S_hyper_span_info_t *spans;   /* Hyperslab span info node */
@@ -4019,13 +4014,12 @@ done:
  PURPOSE
     Helper routine to detect intersections in span trees
  USAGE
-    htri_t H5S_hyper_intersect_block_helper(spans, start, end)
+    hbool_t H5S__hyper_intersect_block_helper(spans, start, end)
         H5S_hyper_span_info_t *spans;     IN: First span tree to operate with
-        hssize_t *offset;   IN: Selection offset coordinate
         hsize_t *start;    IN: Starting coordinate for block
         hsize_t *end;      IN: Ending coordinate for block
  RETURN
-    Non-negative on success, negative on failure
+    Non-negative (TRUE/FALSE) on success, can't fail
  DESCRIPTION
     Quickly detect intersections between span tree and block
  GLOBAL VARIABLES
@@ -4369,6 +4363,7 @@ static herr_t
 H5S__hyper_project_simple_higher(const H5S_t *base_space, H5S_t *new_space)
 {
     H5S_hyper_span_t *prev_span = NULL; /* Pointer to previous list of spans */
+    unsigned delta_rank;                /* Difference in dataspace ranks */
     unsigned curr_dim;                  /* Current dimension being operated on */
     herr_t ret_value = SUCCEED;         /* Return value */
 
@@ -4382,7 +4377,8 @@ H5S__hyper_project_simple_higher(const H5S_t *base_space, H5S_t *new_space)
     /* Create nodes until reaching the correct # of dimensions */
     new_space->select.sel_info.hslab->span_lst = NULL;
     curr_dim = 0;
-    while(curr_dim < (new_space->extent.rank - base_space->extent.rank)) {
+    delta_rank = (new_space->extent.rank - base_space->extent.rank);
+    while(curr_dim < delta_rank) {
         H5S_hyper_span_info_t *new_span_info;  /* Pointer to list of spans */
         H5S_hyper_span_t *new_span;     /* Temporary hyperslab span */
 
@@ -4723,11 +4719,11 @@ done:
     "Normalize" a hyperslab selection by adjusting it's coordinates by the
     amount of the selection offset.
  USAGE
-    hbool_t H5S_hyper_normalize_offset(space, old_offset)
+    htri_t H5S_hyper_normalize_offset(space, old_offset)
         H5S_t *space;           IN/OUT: Pointer to dataspace to move
         hssize_t *old_offset;   OUT: Pointer to space to store old offset
  RETURNS
-    TRUE if space has been normalized, FALSE if not
+    TRUE/FALSE for hyperslab selection, FAIL on error
  DESCRIPTION
     Copies the current selection offset into the array provided, then
     inverts the selection offset, subtracts the offset from the hyperslab
@@ -4740,7 +4736,7 @@ done:
 htri_t
 H5S_hyper_normalize_offset(H5S_t *space, hssize_t *old_offset)
 {
-    htri_t ret_value = FALSE;           /* Return value */
+    htri_t ret_value = FALSE;          /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
 
@@ -5101,10 +5097,10 @@ H5S__hyper_clip_spans(H5S_hyper_span_info_t *a_spans, H5S_hyper_span_info_t *b_s
                     /* Split off upper part of span 'b' at upper span of span 'a' */
 
                     /* Check if there is actually an upper part of span 'b' to split off */
-                    if(span_a->high<span_b->high) {
+                    if(span_a->high < span_b->high) {
                         /* Allocate new span node for upper part of span 'b' */
                         if(NULL == (tmp_span = H5S__hyper_new_span(span_a->high + 1, span_b->high, span_b->down, span_b->next)))
-                            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't allocate hyperslab span")
+                            HGOTO_ERROR(H5E_DATASPACE, H5E_NOSPACE, FAIL, "can't allocate hyperslab span")
 
                         /* Advance span 'a' */
                         H5S__hyper_recover_span(&recover_a,&span_a,span_a->next);
@@ -5269,12 +5265,12 @@ H5S__hyper_clip_spans(H5S_hyper_span_info_t *a_spans, H5S_hyper_span_info_t *b_s
                     } /* end else */
 
                     /* Check if there is actually an upper part of span 'b' to split off */
-                    if(span_a->high<span_b->high) {
+                    if(span_a->high < span_b->high) {
                         /* Split off upper part of span 'b' at upper span of span 'a' */
 
                         /* Allocate new span node for upper part of spans 'a' */
                         if(NULL == (tmp_span = H5S__hyper_new_span(span_a->high + 1, span_b->high, span_b->down, span_b->next)))
-                            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't allocate hyperslab span")
+                            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate hyperslab span")
 
                         /* And advance span 'a' */
                         H5S__hyper_recover_span(&recover_a,&span_a,span_a->next);
@@ -5294,9 +5290,9 @@ H5S__hyper_clip_spans(H5S_hyper_span_info_t *a_spans, H5S_hyper_span_info_t *b_s
                 /*                AAAAAAAAAA             */
                 /* <-----------------------------------> */
                 /*             BBBBBBBBBB                */
-                else if((span_a->low>=span_b->low && span_a->low<=span_b->high) && span_a->high>span_b->high) {
+                else if((span_a->low >= span_b->low && span_a->low <= span_b->high) && span_a->high > span_b->high) {
                     /* Check if there is actually a lower part of span 'b' to split off */
-                    if(span_a->low>span_b->low) {
+                    if(span_a->low > span_b->low) {
                         /* Split off lower part of span 'b' at lower span of span 'a' */
 
                         /* Merge/add lower part of span 'b' with/to b_not_a list */
@@ -5364,7 +5360,7 @@ H5S__hyper_clip_spans(H5S_hyper_span_info_t *a_spans, H5S_hyper_span_info_t *b_s
 
                     /* Allocate new span node for upper part of span 'a' */
                     if(NULL == (tmp_span = H5S__hyper_new_span(span_b->high + 1, span_a->high, span_a->down, span_a->next)))
-                        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't allocate hyperslab span")
+                        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate hyperslab span")
 
                     /* Make upper part of span 'a' into new span 'a' */
                     H5S__hyper_recover_span(&recover_a,&span_a,tmp_span);
@@ -5448,12 +5444,6 @@ static H5S_hyper_span_info_t *
 H5S__hyper_merge_spans_helper(H5S_hyper_span_info_t *a_spans, H5S_hyper_span_info_t *b_spans)
 {
     H5S_hyper_span_info_t *merged_spans = NULL; /* Pointer to the merged span tree */
-    H5S_hyper_span_info_t *tmp_spans;   /* Pointer to temporary new span tree */
-    H5S_hyper_span_t *tmp_span;         /* Pointer to temporary new span */
-    H5S_hyper_span_t *span_a;           /* Pointer to current span 'a' working on */
-    H5S_hyper_span_t *span_b;           /* Pointer to current span 'b' working on */
-    H5S_hyper_span_t *prev_span_merge;  /* Pointer to previous merged span */
-    hbool_t recover_a, recover_b;         /* Flags to indicate when to recover temporary spans */
     H5S_hyper_span_info_t *ret_value = NULL;    /* Return value */
 
     FUNC_ENTER_STATIC
@@ -5472,6 +5462,11 @@ H5S__hyper_merge_spans_helper(H5S_hyper_span_info_t *a_spans, H5S_hyper_span_inf
         } /* end else */
     } /* end if */
     else {
+        H5S_hyper_span_t *span_a;           /* Pointer to current span 'a' working on */
+        H5S_hyper_span_t *span_b;           /* Pointer to current span 'b' working on */
+        H5S_hyper_span_t *prev_span_merge;  /* Pointer to previous merged span */
+        hbool_t recover_a, recover_b;       /* Flags to indicate when to recover temporary spans */
+
         /* Get the pointers to the 'a' and 'b' span lists */
         span_a = a_spans->head;
         span_b = b_spans->head;
@@ -5484,6 +5479,9 @@ H5S__hyper_merge_spans_helper(H5S_hyper_span_info_t *a_spans, H5S_hyper_span_inf
 
         /* Work through the list of spans in the new list */
         while(span_a != NULL && span_b != NULL) {
+            H5S_hyper_span_info_t *tmp_spans;   /* Pointer to temporary new span tree */
+            H5S_hyper_span_t *tmp_span;         /* Pointer to temporary new span */
+
             /* Check if the 'a' span is completely before 'b' span */
             /*    AAAAAAA                            */
             /* <-----------------------------------> */
@@ -5766,7 +5764,7 @@ done:
 static herr_t
 H5S__hyper_merge_spans(H5S_t *space, H5S_hyper_span_info_t *new_spans, hbool_t can_own)
 {
-    FUNC_ENTER_NOAPI_NOINIT_NOERR
+    FUNC_ENTER_STATIC_NOERR
 
     /* Check args */
     HDassert(space);
@@ -9317,21 +9315,17 @@ H5S__hyper_project_intersection(const H5S_t *src_space, const H5S_t *dst_space,
         
     /* Assert that src_space and src_intersect_space have same extent and there
      * are no point selections */
-    HDassert(H5S_GET_EXTENT_NDIMS(src_space)
-            == H5S_GET_EXTENT_NDIMS(src_intersect_space));
+    HDassert(H5S_GET_EXTENT_NDIMS(src_space) == H5S_GET_EXTENT_NDIMS(src_intersect_space));
     HDassert(!HDmemcmp(src_space->extent.size, src_intersect_space->extent.size,
-            (size_t)H5S_GET_EXTENT_NDIMS(src_space)
-            * sizeof(src_space->extent.size[0])));
+            (size_t)H5S_GET_EXTENT_NDIMS(src_space) * sizeof(src_space->extent.size[0])));
     HDassert(H5S_GET_SELECT_TYPE(src_space) != H5S_SEL_POINTS);
     HDassert(H5S_GET_SELECT_TYPE(dst_space) != H5S_SEL_POINTS);
     HDassert(H5S_GET_SELECT_TYPE(src_intersect_space) != H5S_SEL_POINTS);
 
     /* Initialize prev_space, curr_span_tree, and curr_span_up_dim */
-    for(i = 0; i < H5S_MAX_RANK; i++) {
-        curr_span_tree[i] = NULL;
-        prev_span[i] = NULL;
-        curr_span_up_dim[i] = (hsize_t)0;
-    } /* end for */
+    HDmemset(curr_span_tree, 0, sizeof(curr_span_tree));
+    HDmemset(prev_span, 0, sizeof(prev_span));
+    HDmemset(curr_span_up_dim, 0, sizeof(curr_span_up_dim));
 
     /* Save rank of projected space */
     proj_rank = proj_space->extent.rank;
@@ -9343,8 +9337,7 @@ H5S__hyper_project_intersection(const H5S_t *src_space, const H5S_t *dst_space,
     sis_nelem = (size_t)H5S_GET_SELECT_NPOINTS(src_intersect_space);
     HDassert(ss_nelem == ds_nelem);
 
-    /* Calculate proj_down_dims (note loop relies on unsigned i wrapping around)
-     */
+    /* Calculate proj_down_dims */
     if(H5VM_array_down(proj_rank, proj_space->extent.size, proj_down_dims) < 0)
         HGOTO_ERROR(H5E_DATASPACE, H5E_CANTSET, FAIL, "can't compute 'down' chunk size value")
 
@@ -9358,7 +9351,7 @@ H5S__hyper_project_intersection(const H5S_t *src_space, const H5S_t *dst_space,
 
     /* Allocate space for the hyperslab selection information (note this sets
      * diminfo_valid to FALSE, diminfo arrays to 0, and span list to NULL) */
-    if((proj_space->select.sel_info.hslab = H5FL_CALLOC(H5S_hyper_sel_t)) == NULL)
+    if(NULL == (proj_space->select.sel_info.hslab = H5FL_CALLOC(H5S_hyper_sel_t)))
         HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate hyperslab info")
 
     /* Set selection type */
@@ -9367,9 +9360,9 @@ H5S__hyper_project_intersection(const H5S_t *src_space, const H5S_t *dst_space,
     /* Set unlim_dim */
     proj_space->select.sel_info.hslab->unlim_dim = -1;
 
-    /* Allocate the source space iterator */
+    /* Allocate the source selection iterator */
     if(NULL == (ss_iter = H5FL_MALLOC(H5S_sel_iter_t)))
-        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate source space iterator")
+        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate source selection iterator")
 
     /* Initialize source space iterator */
     if(H5S_select_iter_init(ss_iter, src_space, (size_t)1) < 0)
@@ -9382,9 +9375,9 @@ H5S__hyper_project_intersection(const H5S_t *src_space, const H5S_t *dst_space,
     ss_nelem -= nelem;
     HDassert(ss_nseq > 0);
 
-    /* Allocate the destination space iterator */
+    /* Allocate the destination selection iterator */
     if(NULL == (ds_iter = H5FL_MALLOC(H5S_sel_iter_t)))
-        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate destination space iterator")
+        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate destination selection iterator")
 
     /* Initialize destination space iterator */
     if(H5S_select_iter_init(ds_iter, dst_space, (size_t)1) < 0)
@@ -9443,9 +9436,8 @@ H5S__hyper_project_intersection(const H5S_t *src_space, const H5S_t *dst_space,
 
             /* Reset advance_ss */
             advance_ss = FALSE;
-        } /* end if */
-        if(advance_sis
-                || (sis_off[sis_i] + sis_len[sis_i] <= ss_off[ss_i])) {
+        } /* end while */
+        if(advance_sis || (sis_off[sis_i] + sis_len[sis_i] <= ss_off[ss_i])) {
             do {
                 /* Either we finished the current source intersect sequence or
                  * the sequences do not intersect.  Advance source intersect
@@ -9524,8 +9516,7 @@ H5S__hyper_project_intersection(const H5S_t *src_space, const H5S_t *dst_space,
                 HDassert(ds_sel_off <= int_sel_off);
                 proj_off = ds_off[ds_i] + int_sel_off - ds_sel_off;
                 proj_len = proj_len_rem = (size_t)MIN(int_len,
-                        (size_t)(ds_sel_off + (hsize_t)ds_len[ds_i]
-                        - int_sel_off));
+                        (size_t)(ds_sel_off + (hsize_t)ds_len[ds_i] - int_sel_off));
 
                 /* Add to span tree */
                 while(proj_len_rem > (size_t)0) {
@@ -9565,7 +9556,7 @@ H5S__hyper_project_intersection(const H5S_t *src_space, const H5S_t *dst_space,
                             (size_t)(proj_space->extent.size[proj_rank - 1]
                             - low));
                     HDassert(proj_len_rem >= span_len);
-                    high = low + (hsize_t)span_len - (hsize_t)1;
+                    high = (low + (hsize_t)span_len) - (hsize_t)1;
 
                     /* Append span in lowest dimension */
                     if(H5S__hyper_append_span(&prev_span[proj_rank - 1], &curr_span_tree[proj_rank - 1], low, high, NULL, NULL) < 0)
@@ -9791,11 +9782,11 @@ done:
  EXAMPLES
  REVISION LOG
 --------------------------------------------------------------------------*/
-void
+static void
 H5S__hyper_get_clip_diminfo(hsize_t start, hsize_t stride, hsize_t *count,
     hsize_t *block, hsize_t clip_size)
 {
-    FUNC_ENTER_PACKAGE_NOERR
+    FUNC_ENTER_STATIC_NOERR
 
     /* Check for selection outside clip size */
     if(start >= clip_size) {
@@ -9819,7 +9810,7 @@ H5S__hyper_get_clip_diminfo(hsize_t start, hsize_t stride, hsize_t *count,
     } /* end else */
 
     FUNC_LEAVE_NOAPI_VOID
-} /* end H5S_hyper_get_clip_diminfo() */
+} /* end H5S__hyper_get_clip_diminfo() */
 
 
 /*--------------------------------------------------------------------------
@@ -9836,8 +9827,7 @@ H5S__hyper_get_clip_diminfo(hsize_t start, hsize_t stride, hsize_t *count,
     Non-negative on success/Negative on failure.
  DESCRIPTION
     This function changes the unlimited selection into a limited selection
-    with the extent of the formerly unlimited dimension specified by
-    * clip_size.
+    with the extent of the formerly unlimited dimension specified by clip_size.
  GLOBAL VARIABLES
  COMMENTS, BUGS, ASSUMPTIONS
     Note this function does not take the offset into account.
@@ -9892,8 +9882,7 @@ H5S_hyper_clip_unlim(H5S_t *space, hsize_t clip_size)
     } /* end if */
     else {
         /* Calculate number of elements */
-        space->select.num_elem = diminfo->count * diminfo->block
-                * hslab->num_elem_non_unlim;
+        space->select.num_elem = diminfo->count * diminfo->block * hslab->num_elem_non_unlim;
 
         /* Check if last block is partial.  If superset is set, just keep the
          * last block complete to speed computation. */
@@ -9924,8 +9913,7 @@ H5S_hyper_clip_unlim(H5S_t *space, hsize_t clip_size)
             /* Indicate that the regular dimensions are no longer valid */
             hslab->diminfo_valid = FALSE;
 
-            /* "And" selection with calculated block to perform clip operation
-             */
+            /* "And" selection with calculated block to perform clip operation */
             if(H5S__generate_hyperslab(space, H5S_SELECT_AND, start, H5S_hyper_ones_g, H5S_hyper_ones_g, block) < 0)
                 HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINSERT, FAIL, "can't generate hyperslabs")
         } /* end if */
@@ -10369,7 +10357,7 @@ done:
 
 /*--------------------------------------------------------------------------
  NAME
-    H5Sgetregular_hyperslab
+    H5Sget_regular_hyperslab
  PURPOSE
     Retrieve a regular hyperslab selection
  USAGE
diff --git a/src/H5Spkg.h b/src/H5Spkg.h
index d895f40..9ad97dc 100644
--- a/src/H5Spkg.h
+++ b/src/H5Spkg.h
@@ -124,7 +124,7 @@ typedef struct {
          * information. */
     int unlim_dim;                      /* Dimension where selection is unlimited, or -1 if none */
     hsize_t num_elem_non_unlim;         /* # of elements in a "slice" excluding the unlimited dimension */
-    H5S_hyper_span_info_t *span_lst;    /* List of hyperslab span information */
+    H5S_hyper_span_info_t *span_lst;    /* List of hyperslab span information of all dimensions */
 } H5S_hyper_sel_t;
 
 /* Selection information methods */
@@ -275,8 +275,7 @@ H5_DLL herr_t H5S_extent_copy_real(H5S_extent_t *dst, const H5S_extent_t *src,
 
 /* Operations on selections */
 H5_DLL herr_t H5S__hyper_project_intersection(const H5S_t *src_space,
-    const H5S_t *dst_space, const H5S_t *src_intersect_space,
-    H5S_t *proj_space);
+    const H5S_t *dst_space, const H5S_t *src_intersect_space, H5S_t *proj_space);
 H5_DLL herr_t H5S__hyper_subtract(H5S_t *space, H5S_t *subtract_space);
 
 /* Testing functions */
diff --git a/src/H5Spoint.c b/src/H5Spoint.c
index 9924920..aea7d5c 100644
--- a/src/H5Spoint.c
+++ b/src/H5Spoint.c
@@ -775,7 +775,6 @@ done:
 static hssize_t
 H5S_point_serial_size (const H5S_t *space)
 {
-    H5S_pnt_node_t *curr;       /* Point information nodes */
     hssize_t ret_value = -1;    /* Return value */
 
     FUNC_ENTER_NOAPI_NOINIT_NOERR
@@ -789,12 +788,8 @@ H5S_point_serial_size (const H5S_t *space)
     ret_value = 24;
 
     /* Count points in selection */
-    curr=space->select.sel_info.pnt_lst->head;
-    while(curr!=NULL) {
-        /* Add 4 bytes times the rank for each element selected */
-        ret_value+=4*space->extent.rank;
-        curr=curr->next;
-    } /* end while */
+    /* (Add 4 bytes times the rank for each element selected) */
+    ret_value += (4 * space->extent.rank) * (hssize_t)H5S_GET_SELECT_NPOINTS(space);
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5S_point_serial_size() */
diff --git a/src/H5Sselect.c b/src/H5Sselect.c
index ea10517..dd656b1 100644
--- a/src/H5Sselect.c
+++ b/src/H5Sselect.c
@@ -1515,14 +1515,20 @@ H5S_select_iterate(void *buf, const H5T_t *type, const H5S_t *space,
                         /* Make the application callback */
                         user_ret = (op->u.app_op.op)(loc, op->u.app_op.type_id, ndims, coords, op_data);
                     break;
+
                     case H5S_SEL_ITER_OP_LIB:
                         /* Call the library's callback */
                         user_ret = (op->u.lib_op)(loc, type, ndims, coords, op_data);
                     break;
+
                     default:
                         HGOTO_ERROR(H5E_DATASPACE, H5E_UNSUPPORTED, FAIL, "unsupported op type")
                 } /* end switch */
 
+                /* Check for error return from iterator */
+                if(user_ret < 0)
+                    HERROR(H5E_DATASPACE, H5E_CANTNEXT, "iteration operator failed");
+
                 /* Increment offset in dataspace */
                 curr_off += elmt_size;
 
@@ -1709,10 +1715,6 @@ H5S_select_shape_same(const H5S_t *space1, const H5S_t *space2)
         HDassert(space_a_rank >= space_b_rank);
         HDassert(space_b_rank > 0);
 
-        /* Check for different number of elements selected */
-        if(H5S_GET_SELECT_NPOINTS(space_a) != H5S_GET_SELECT_NPOINTS(space_b))
-            HGOTO_DONE(FALSE)
-
         /* Check for "easy" cases before getting into generalized block iteration code */
         if((H5S_GET_SELECT_TYPE(space_a) == H5S_SEL_ALL) && (H5S_GET_SELECT_TYPE(space_b) == H5S_SEL_ALL)) {
             hsize_t dims1[H5O_LAYOUT_NDIMS];    /* End point of selection block in dataspace #1 */
diff --git a/src/H5T.c b/src/H5T.c
index cd54183..9544488 100644
--- a/src/H5T.c
+++ b/src/H5T.c
@@ -295,6 +295,7 @@ static htri_t H5T__compiler_conv(H5T_t *src, H5T_t *dst);
 static herr_t H5T__set_size(H5T_t *dt, size_t size);
 static herr_t H5T__close_cb(H5T_t *dt);
 static H5T_path_t *H5T__path_find_real(const H5T_t *src, const H5T_t *dst, const char *name, H5T_conv_func_t *conv);
+static hbool_t H5T__detect_reg_ref(const H5T_t *dt);
 
 
 /*****************************/
@@ -1729,7 +1730,6 @@ H5Tcopy(hid_t type_id)
         case H5I_GROUP:
         case H5I_DATASPACE:
         case H5I_ATTR:
-        case H5I_REFERENCE:
         case H5I_VFL:
         case H5I_VOL:
         case H5I_GENPROP_CLS:
@@ -5507,6 +5507,111 @@ done:
 
 
 /*-------------------------------------------------------------------------
+ * Function:   H5T_detect_reg_ref
+ *
+ * Purpose:    Check whether a datatype contains (or is) a region reference
+ *             datatype.
+ *
+ * Return:      TRUE (1) or FALSE (0) on success
+ *		(Can't fail)
+ *
+ * Programmer:  Quincey Koziol
+ *              Saturday, January 5, 2019
+ *
+ *-------------------------------------------------------------------------
+ */
+static hbool_t
+H5T__detect_reg_ref(const H5T_t *dt)
+{
+    unsigned    u;                      /* Local index variable */
+    hbool_t     ret_value = FALSE;      /* Return value */
+
+    FUNC_ENTER_STATIC_NOERR
+
+    /* Sanity checks */
+    HDassert(dt);
+
+    /* Check if this datatype is a region reference */
+    if(H5T_REFERENCE == dt->shared->type && H5R_DATASET_REGION == dt->shared->u.atomic.u.r.rtype)
+        HGOTO_DONE(TRUE);
+
+    /* Check for types that might have the correct type as a component */
+    switch(dt->shared->type) {
+        case H5T_COMPOUND:
+            /* Iterate over all the compound datatype's fields */
+            for(u = 0; u < dt->shared->u.compnd.nmembs; u++)
+                /* Recurse on field's datatype */
+                if(H5T__detect_reg_ref(dt->shared->u.compnd.memb[u].type))
+                    HGOTO_DONE(TRUE);
+            break;
+
+        case H5T_ARRAY:
+        case H5T_VLEN:
+        case H5T_ENUM:
+            HGOTO_DONE(H5T__detect_reg_ref(dt->shared->parent));
+            break;
+
+        case H5T_NO_CLASS:
+        case H5T_INTEGER:
+        case H5T_FLOAT:
+        case H5T_TIME:
+        case H5T_STRING:
+        case H5T_BITFIELD:
+        case H5T_OPAQUE:
+        case H5T_REFERENCE:
+        case H5T_NCLASSES:
+        default:
+            break;
+    } /* end if */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5T__detect_reg_ref() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5T_is_vl_storage
+ *
+ * Purpose:     Check if a datatype will be stored in a variable-length form.
+ *
+ * Notes:       Currently, only variable-length string & sequences and region
+ *              references are stored in a variable-length form.
+ *
+ * Return:
+ *  One of two values on success:
+ *      TRUE - If the datatype will be stored in a variable-length form
+ *      FALSE - If the datatype will NOT be stored in a variable-length form
+ *  <0 is returned on failure
+ *
+ * Programmer:  Quincey Koziol
+ *              Saturday, January 5, 2019
+ *
+ *-------------------------------------------------------------------------
+ */
+htri_t
+H5T_is_vl_storage(const H5T_t *dt)
+{
+    htri_t ret_value = FALSE;
+
+    FUNC_ENTER_NOAPI(FAIL)
+
+    /* Sanity check */
+    HDassert(dt);
+
+    /* VL and region reference datatypes are stored in variable-length form */
+    if(H5T_detect_class(dt, H5T_VLEN, FALSE))
+        ret_value = TRUE;
+    else if(H5T_detect_class(dt, H5T_REFERENCE, FALSE))
+        ret_value = H5T__detect_reg_ref(dt);
+    else
+        ret_value = FALSE;
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5T_is_vl_storage() */
+
+
+/*-------------------------------------------------------------------------
  * Function:    H5T_upgrade_version_cb
  *
  * Purpose:     H5T__visit callback to Upgrade the version of a datatype
diff --git a/src/H5Tcommit.c b/src/H5Tcommit.c
index 610c628..712b264 100644
--- a/src/H5Tcommit.c
+++ b/src/H5Tcommit.c
@@ -155,7 +155,7 @@ H5Tcommit2(hid_t loc_id, const char *name, hid_t type_id, hid_t lcpl_id,
 
     /* Set up VOL object */
     if(NULL == (new_obj = H5FL_CALLOC(H5VL_object_t)))
-        HGOTO_ERROR(H5E_VOL, H5E_NOSPACE, FAIL, "can't allocate top object structure")
+        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTALLOC, FAIL, "can't allocate top object structure")
     new_obj->connector = vol_obj->connector;
     new_obj->connector->nrefs ++;
     new_obj->data = data;
@@ -308,7 +308,7 @@ H5Tcommit_anon(hid_t loc_id, hid_t type_id, hid_t tcpl_id, hid_t tapl_id)
 
     /* Setup VOL object */
     if(NULL == (new_obj = H5FL_CALLOC(H5VL_object_t)))
-        HGOTO_ERROR(H5E_VOL, H5E_NOSPACE, FAIL, "can't allocate top object structure")
+        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTALLOC, FAIL, "can't allocate top object structure")
     new_obj->connector = vol_obj->connector;
     new_obj->connector->nrefs ++;
     new_obj->data = dt;
diff --git a/src/H5Tprivate.h b/src/H5Tprivate.h
index 6b6446f..3dcbb2c 100644
--- a/src/H5Tprivate.h
+++ b/src/H5Tprivate.h
@@ -145,6 +145,7 @@ H5_DLL H5T_t *H5T_get_actual_type(H5T_t *dt);
 H5_DLL herr_t H5T_save_refresh_state(hid_t tid, struct H5O_shared_t *cached_H5O_shared);
 H5_DLL herr_t H5T_restore_refresh_state(hid_t tid, struct H5O_shared_t *cached_H5O_shared);
 H5_DLL hbool_t H5T_already_vol_managed(const H5T_t *dt);
+H5_DLL htri_t H5T_is_vl_storage(const H5T_t *dt);
 
 /* Reference specific functions */
 H5_DLL H5R_type_t H5T_get_ref_type(const H5T_t *dt);
diff --git a/src/H5VL.c b/src/H5VL.c
index eedf68d..37ad187 100644
--- a/src/H5VL.c
+++ b/src/H5VL.c
@@ -11,7 +11,7 @@
  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
 /*
- * Purpose:	The Virtual Object Layer as described in documentation.
+ * Purpose:     The Virtual Object Layer as described in documentation.
  *              The pupose is to provide an abstraction on how to access the
  *              underlying HDF5 container, whether in a local file with
  *              a specific file format, or remotely on other machines, etc...
@@ -295,7 +295,7 @@ H5VLregister_connector_by_value(H5VL_class_value_t value, hid_t vipl_id)
         const H5VL_class_t *cls;
 
         /* Try loading the connector */
-        key.vol.kind = H5VL_GET_CONNECTOR_BY_NAME;
+        key.vol.kind = H5VL_GET_CONNECTOR_BY_VALUE;
         key.vol.u.value = value;
         if(NULL == (cls = (const H5VL_class_t *)H5PL_load(H5PL_TYPE_VOL, &key)))
             HGOTO_ERROR(H5E_VOL, H5E_CANTINIT, H5I_INVALID_HID, "unable to load VOL connector")
@@ -486,14 +486,11 @@ done:
 /*---------------------------------------------------------------------------
  * Function:    H5VLcmp_connector_cls
  *
- * Purpose:     Compares two connector classes
+ * Purpose:     Compares two connector classes (based on their value field)
  *
- * Return:      Success:    Non-negative, with *cmp set to positive if
- *		connector_id1 is greater than connector_id2, negative if connector_id2
- *		is greater than connector_id1 and zero if connector_id1 and connector_id2
- *		are equal.
+ * Return:      Success:    Non-negative, *cmp set to a value like strcmp
  *
- *              Failure:    Negative
+ *              Failure:    Negative, *cmp unset
  *
  *---------------------------------------------------------------------------
  */
@@ -520,3 +517,73 @@ done:
     FUNC_LEAVE_API(ret_value)
 } /* H5VLcmp_connector_cls() */
 
+
+/*---------------------------------------------------------------------------
+ * Function:    H5VLwrap_register
+ *
+ * Purpose:     Wrap an internal object with a "wrap context" and register an
+ *		hid_t for the resulting object.
+ *
+ * Note:	This routine is mainly targeted toward wrapping objects for
+ *		iteration routine callbacks (i.e. the callbacks from H5Aiterate*,
+ *		H5Literate* / H5Lvisit*, and H5Ovisit* ).
+ *
+ * Return:      Success:    Non-negative hid_t for the object.
+ *              Failure:    Negative (H5I_INVALID_HID)
+ *
+ *---------------------------------------------------------------------------
+ */
+hid_t
+H5VLwrap_register(void *obj, H5I_type_t type)
+{
+    hid_t ret_value;            /* Return value */
+
+    /* Use FUNC_ENTER_API_NOINIT here, so the API context doesn't get reset */
+    FUNC_ENTER_API_NOINIT
+    H5TRACE2("i", "*xIt", obj, type);
+
+    /* Check args */
+    if(type <= H5I_BADID || type >= H5I_NTYPES)
+        HGOTO_ERROR(H5E_VOL, H5E_BADRANGE, H5I_INVALID_HID, "invalid type number")
+    if(NULL == obj)
+        HGOTO_ERROR(H5E_VOL, H5E_BADVALUE, H5I_INVALID_HID, "obj is NULL")
+
+    /* Wrap the object and register an ID for it */
+    if((ret_value = H5VL_wrap_register(type, obj, TRUE)) < 0)
+        HGOTO_ERROR(H5E_VOL, H5E_CANTREGISTER, H5I_INVALID_HID, "unable to wrap object")
+
+done:
+    FUNC_LEAVE_API_NOINIT(ret_value)
+} /* H5VLwrap_register() */
+
+
+/*---------------------------------------------------------------------------
+ * Function:    H5VLobject
+ *
+ * Purpose:     Retrieve the object pointer associated with an hid_t for a.
+ *		VOL object.
+ *
+ * Note:	This routine is mainly targeted toward unwrapping objects for
+ *		testing.
+ *
+ * Return:      Success:    Object pointer
+ *              Failure:    NULL
+ *
+ *---------------------------------------------------------------------------
+ */
+void *
+H5VLobject(hid_t id)
+{
+    void *ret_value;            /* Return value */
+
+    FUNC_ENTER_API(NULL)
+    H5TRACE1("*x", "i", id);
+
+    /* Retrieve the object pointer for the ID */
+    if(NULL == (ret_value = H5VL_object(id)))
+        HGOTO_ERROR(H5E_VOL, H5E_CANTGET, NULL, "unable to retrieve object")
+
+done:
+    FUNC_LEAVE_API(ret_value)
+} /* H5VLobject() */
+
diff --git a/src/H5VLcallback.c b/src/H5VLcallback.c
index 2828262..811162d 100644
--- a/src/H5VLcallback.c
+++ b/src/H5VLcallback.c
@@ -95,8 +95,6 @@ static herr_t H5VL__dataset_optional(void *obj, const H5VL_class_t *cls,
     hid_t dxpl_id, void **req, va_list arguments);
 static herr_t H5VL__dataset_close(void *obj, const H5VL_class_t *cls, hid_t dxpl_id,
     void **req);
-static herr_t H5VL__file_cache_connector(void *obj, const H5VL_class_t *cls,
-    hid_t dxpl_id, void **req, ...);
 static void * H5VL__file_create(const H5VL_class_t *cls, const char *name,
     unsigned flags, hid_t fcpl_id, hid_t fapl_id, hid_t dxpl_id, void **req);
 static void * H5VL__file_open(const H5VL_class_t *cls, const char *name,
@@ -1360,7 +1358,7 @@ H5VL_attr_get(const H5VL_object_t *vol_obj, H5VL_attr_get_t get_type,
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if(H5VL__attr_get(vol_obj->data, vol_obj->connector->cls, get_type, dxpl_id, req, arguments) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "attribute get failed")
@@ -1368,7 +1366,7 @@ H5VL_attr_get(const H5VL_object_t *vol_obj, H5VL_attr_get_t get_type,
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -1473,7 +1471,7 @@ H5VL_attr_specific(const H5VL_object_t *vol_obj, const H5VL_loc_params_t *loc_pa
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if((ret_value = H5VL__attr_specific(vol_obj->data, loc_params, vol_obj->connector->cls, specific_type, dxpl_id, req, arguments)) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTOPERATE, FAIL, "unable to execute attribute specific callback")
@@ -1481,7 +1479,7 @@ H5VL_attr_specific(const H5VL_object_t *vol_obj, const H5VL_loc_params_t *loc_pa
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -1584,7 +1582,7 @@ H5VL_attr_optional(const H5VL_object_t *vol_obj, hid_t dxpl_id, void **req, ...)
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if((ret_value = H5VL__attr_optional(vol_obj->data, vol_obj->connector->cls, dxpl_id, req, arguments)) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTOPERATE, FAIL, "unable to execute attribute optional callback")
@@ -1592,7 +1590,7 @@ H5VL_attr_optional(const H5VL_object_t *vol_obj, hid_t dxpl_id, void **req, ...)
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -2207,7 +2205,7 @@ H5VL_dataset_get(const H5VL_object_t *vol_obj, H5VL_dataset_get_t get_type,
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if(H5VL__dataset_get(vol_obj->data, vol_obj->connector->cls, get_type, dxpl_id, req, arguments) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "dataset get failed")
@@ -2215,7 +2213,7 @@ H5VL_dataset_get(const H5VL_object_t *vol_obj, H5VL_dataset_get_t get_type,
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -2319,7 +2317,7 @@ H5VL_dataset_specific(const H5VL_object_t *vol_obj, H5VL_dataset_specific_t spec
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if(H5VL__dataset_specific(vol_obj->data, vol_obj->connector->cls, specific_type, dxpl_id, req, arguments) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTOPERATE, FAIL, "unable to execute dataset specific callback")
@@ -2327,7 +2325,7 @@ H5VL_dataset_specific(const H5VL_object_t *vol_obj, H5VL_dataset_specific_t spec
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -2432,7 +2430,7 @@ H5VL_dataset_optional(const H5VL_object_t *vol_obj, hid_t dxpl_id,
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if(H5VL__dataset_optional(vol_obj->data, vol_obj->connector->cls, dxpl_id, req, arguments) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTOPERATE, FAIL, "unable to execute dataset optional callback")
@@ -2440,7 +2438,7 @@ H5VL_dataset_optional(const H5VL_object_t *vol_obj, hid_t dxpl_id,
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -2596,42 +2594,6 @@ done:
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL__file_cache_connector
- *
- * Purpose:	Wrap varargs and reissue 'cache VOL connector' operation
- *		to file specific call
- *
- * Return:      Success:    Non-negative
- *              Failure:    Negative
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__file_cache_connector(void *obj, const H5VL_class_t *cls, hid_t dxpl_id,
-    void **req, ...)
-{
-    va_list arguments;                  /* Argument list passed from the API call */
-    hbool_t arg_started = FALSE;        /* Whether the va_list has been started */
-    herr_t ret_value = SUCCEED;         /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    /* Re-issue call to internal file specific callback routine */
-    va_start(arguments, req);
-    arg_started = TRUE;
-    if(H5VL__file_specific(obj, cls, H5VL_FILE_CACHE_VOL_CONN, dxpl_id, req, arguments) < 0)
-        HGOTO_ERROR(H5E_VOL, H5E_CANTOPERATE, FAIL, "file specific failed")
-
-done:
-    /* End access to the va_list, if we started it */
-    if(arg_started)
-        va_end(arguments);
-
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__file_cache_connector() */
-
-
-/*-------------------------------------------------------------------------
  * Function:	H5VL__file_create
  *
  * Purpose:	Creates a file through the VOL
@@ -2695,10 +2657,6 @@ H5VL_file_create(const H5VL_connector_prop_t *connector_prop, const char *name,
     if(NULL == (ret_value = H5VL__file_create(cls, name, flags, fcpl_id, fapl_id, dxpl_id, req)))
         HGOTO_ERROR(H5E_VOL, H5E_CANTCREATE, NULL, "file create failed")
 
-    /* Cache the connector ID & info */
-    if(H5VL__file_cache_connector(ret_value, cls, dxpl_id, req, connector_prop->connector_id, connector_prop->connector_info) < 0)
-        HGOTO_ERROR(H5E_VOL, H5E_CANTSET, NULL, "caching VOL connector ID & info failed")
-
 done:
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5VL_file_create() */
@@ -2806,10 +2764,6 @@ H5VL_file_open(const H5VL_connector_prop_t *connector_prop, const char *name,
     if(NULL == (ret_value = H5VL__file_open(cls, name, flags, fapl_id, dxpl_id, req)))
         HGOTO_ERROR(H5E_VOL, H5E_CANTOPENOBJ, NULL, "open failed")
 
-    /* Cache the connector ID & info */
-    if(H5VL__file_cache_connector(ret_value, cls, dxpl_id, req, connector_prop->connector_id, connector_prop->connector_info) < 0)
-        HGOTO_ERROR(H5E_VOL, H5E_CANTSET, NULL, "caching VOL connector ID & info failed")
-
 done:
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5VL_file_open() */
@@ -2914,7 +2868,7 @@ H5VL_file_get(const H5VL_object_t *vol_obj, H5VL_file_get_t get_type,
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if(H5VL__file_get(vol_obj->data, vol_obj->connector->cls, get_type, dxpl_id, req, arguments) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "file get failed")
@@ -2922,7 +2876,7 @@ H5VL_file_get(const H5VL_object_t *vol_obj, H5VL_file_get_t get_type,
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -3022,7 +2976,7 @@ H5VL_file_specific(const H5VL_object_t *vol_obj, H5VL_file_specific_t specific_t
     FUNC_ENTER_NOAPI(FAIL)
 
     /* Start access to the varargs, so they are available in all situations below */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
 
     /* Special treatment of file access check */
@@ -3033,9 +2987,9 @@ H5VL_file_specific(const H5VL_object_t *vol_obj, H5VL_file_specific_t specific_t
         hid_t               fapl_id;        /* File access property list for accessing the file */
 
         /* Get the file access property list to access the file */
-        va_copy(tmp_args, arguments);
+        HDva_copy(tmp_args, arguments);
         fapl_id = va_arg(tmp_args, hid_t);
-        va_end(tmp_args);
+        HDva_end(tmp_args);
 
         /* Get the VOL info from the FAPL */
         if(NULL == (plist = (H5P_genplist_t *)H5I_object(fapl_id)))
@@ -3067,7 +3021,7 @@ H5VL_file_specific(const H5VL_object_t *vol_obj, H5VL_file_specific_t specific_t
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -3170,7 +3124,7 @@ H5VL_file_optional(const H5VL_object_t *vol_obj, hid_t dxpl_id, void **req, ...)
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if(H5VL__file_optional(vol_obj->data, vol_obj->connector->cls, dxpl_id, req, arguments) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTOPERATE, FAIL, "file optional failed")
@@ -3178,7 +3132,7 @@ H5VL_file_optional(const H5VL_object_t *vol_obj, hid_t dxpl_id, void **req, ...)
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -3593,7 +3547,7 @@ H5VL_group_get(const H5VL_object_t *vol_obj, H5VL_group_get_t get_type,
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if(H5VL__group_get(vol_obj->data, vol_obj->connector->cls, get_type, dxpl_id, req, arguments) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "group get failed")
@@ -3601,7 +3555,7 @@ H5VL_group_get(const H5VL_object_t *vol_obj, H5VL_group_get_t get_type,
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -3705,7 +3659,7 @@ H5VL_group_specific(const H5VL_object_t *vol_obj, H5VL_group_specific_t specific
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if(H5VL__group_specific(vol_obj->data, vol_obj->connector->cls, specific_type, dxpl_id, req, arguments) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTOPERATE, FAIL, "unable to execute group specific callback")
@@ -3713,7 +3667,7 @@ H5VL_group_specific(const H5VL_object_t *vol_obj, H5VL_group_specific_t specific
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -3816,7 +3770,7 @@ H5VL_group_optional(const H5VL_object_t *vol_obj, hid_t dxpl_id, void **req, ...
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if((ret_value = H5VL__group_optional(vol_obj->data, vol_obj->connector->cls, dxpl_id, req, arguments)) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTOPERATE, FAIL, "unable to execute group optional callback")
@@ -3824,7 +3778,7 @@ H5VL_group_optional(const H5VL_object_t *vol_obj, hid_t dxpl_id, void **req, ...
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -4372,7 +4326,7 @@ H5VL_link_get(const H5VL_object_t *vol_obj, const H5VL_loc_params_t *loc_params,
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if(H5VL__link_get(vol_obj->data, loc_params, vol_obj->connector->cls, get_type, dxpl_id, req, arguments) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "link get failed")
@@ -4380,7 +4334,7 @@ H5VL_link_get(const H5VL_object_t *vol_obj, const H5VL_loc_params_t *loc_params,
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -4484,7 +4438,7 @@ H5VL_link_specific(const H5VL_object_t *vol_obj, const H5VL_loc_params_t *loc_pa
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if((ret_value = H5VL__link_specific(vol_obj->data, loc_params, vol_obj->connector->cls, specific_type, dxpl_id, req, arguments)) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTOPERATE, FAIL, "unable to execute link specific callback")
@@ -4492,7 +4446,7 @@ H5VL_link_specific(const H5VL_object_t *vol_obj, const H5VL_loc_params_t *loc_pa
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -4595,7 +4549,7 @@ H5VL_link_optional(const H5VL_object_t *vol_obj, hid_t dxpl_id, void **req, ...)
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if(H5VL__link_optional(vol_obj->data, vol_obj->connector->cls, dxpl_id, req, arguments) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTOPERATE, FAIL, "unable to execute link optional callback")
@@ -4603,7 +4557,7 @@ H5VL_link_optional(const H5VL_object_t *vol_obj, hid_t dxpl_id, void **req, ...)
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -4924,7 +4878,7 @@ H5VL_object_get(const H5VL_object_t *vol_obj, const H5VL_loc_params_t *loc_param
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if(H5VL__object_get(vol_obj->data, loc_params, vol_obj->connector->cls, get_type, dxpl_id, req, arguments) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "get failed")
@@ -4932,7 +4886,7 @@ H5VL_object_get(const H5VL_object_t *vol_obj, const H5VL_loc_params_t *loc_param
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -5037,7 +4991,7 @@ H5VL_object_specific(const H5VL_object_t *vol_obj, const H5VL_loc_params_t *loc_
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if((ret_value = H5VL__object_specific(vol_obj->data, loc_params, vol_obj->connector->cls, specific_type, dxpl_id, req, arguments)) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTOPERATE, FAIL, "object specific failed")
@@ -5045,7 +4999,7 @@ H5VL_object_specific(const H5VL_object_t *vol_obj, const H5VL_loc_params_t *loc_
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -5152,7 +5106,7 @@ H5VL_object_optional(const H5VL_object_t *vol_obj, hid_t dxpl_id, void **req, ..
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if(H5VL__object_optional(vol_obj->data, vol_obj->connector->cls, dxpl_id, req, arguments) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTOPERATE, FAIL, "unable to execute object optional callback")
@@ -5160,7 +5114,7 @@ H5VL_object_optional(const H5VL_object_t *vol_obj, hid_t dxpl_id, void **req, ..
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -5473,7 +5427,7 @@ H5VL_datatype_get(const H5VL_object_t *vol_obj, H5VL_datatype_get_t get_type,
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if(H5VL__datatype_get(vol_obj->data, vol_obj->connector->cls, get_type, dxpl_id, req, arguments) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "datatype get failed")
@@ -5481,7 +5435,7 @@ H5VL_datatype_get(const H5VL_object_t *vol_obj, H5VL_datatype_get_t get_type,
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -5589,7 +5543,7 @@ H5VL_datatype_specific(const H5VL_object_t *vol_obj, H5VL_datatype_specific_t sp
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if(H5VL__datatype_specific(vol_obj->data, vol_obj->connector->cls, specific_type, dxpl_id, req, arguments) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTOPERATE, FAIL, "unable to execute datatype specific callback")
@@ -5597,7 +5551,7 @@ H5VL_datatype_specific(const H5VL_object_t *vol_obj, H5VL_datatype_specific_t sp
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -5701,7 +5655,7 @@ H5VL_datatype_optional(const H5VL_object_t *vol_obj, hid_t dxpl_id,
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, req);
+    HDva_start(arguments, req);
     arg_started = TRUE;
     if(H5VL__datatype_optional(vol_obj->data, vol_obj->connector->cls, dxpl_id, req, arguments) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTOPERATE, FAIL, "unable to execute datatype optional callback")
@@ -5709,7 +5663,7 @@ H5VL_datatype_optional(const H5VL_object_t *vol_obj, hid_t dxpl_id,
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -6265,7 +6219,7 @@ H5VL_request_specific(const H5VL_object_t *vol_obj,
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, specific_type);
+    HDva_start(arguments, specific_type);
     arg_started = TRUE;
     if((ret_value = H5VL__request_specific(vol_obj->data, vol_obj->connector->cls, specific_type, arguments)) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTOPERATE, FAIL, "unable to execute asynchronous request specific callback")
@@ -6273,7 +6227,7 @@ H5VL_request_specific(const H5VL_object_t *vol_obj,
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
@@ -6379,7 +6333,7 @@ H5VL_request_optional(const H5VL_object_t *vol_obj, ...)
     vol_wrapper_set = TRUE;
 
     /* Call the corresponding internal VOL routine */
-    va_start(arguments, vol_obj);
+    HDva_start(arguments, vol_obj);
     arg_started = TRUE;
     if((ret_value = H5VL__request_optional(vol_obj->data, vol_obj->connector->cls, arguments)) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTOPERATE, FAIL, "unable to execute asynchronous request optional callback")
@@ -6387,7 +6341,7 @@ H5VL_request_optional(const H5VL_object_t *vol_obj, ...)
 done:
     /* End access to the va_list, if we started it */
     if(arg_started)
-        va_end(arguments);
+        HDva_end(arguments);
 
     /* Reset object wrapping info in API context */
     if(vol_wrapper_set && H5VL_reset_vol_wrapper() < 0)
diff --git a/src/H5VLint.c b/src/H5VLint.c
index 82886cd..bdb2908 100644
--- a/src/H5VLint.c
+++ b/src/H5VLint.c
@@ -625,9 +625,12 @@ H5VL_register_connector(const void *_cls, hbool_t app_ref, hid_t vipl_id)
         HGOTO_ERROR(H5E_VOL, H5E_CANTREGISTER, H5I_INVALID_HID, "unable to register VOL connector ID")
 
 done:
-    if (ret_value < 0)
-        if (saved)
-            H5FL_FREE(H5VL_class_t, saved);
+    if (ret_value < 0 && saved) {
+        if (saved->name)
+            H5MM_xfree((void *)(saved->name));  /* Casting away const OK -QAK */
+
+        H5FL_FREE(H5VL_class_t, saved);
+    }
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5VL_register_connector() */
@@ -793,7 +796,6 @@ H5VL__object(hid_t id, H5I_type_t obj_type)
         case H5I_UNINIT:
         case H5I_BADID:
         case H5I_DATASPACE:
-        case H5I_REFERENCE:
         case H5I_VFL:
         case H5I_VOL:
         case H5I_GENPROP_CLS:
@@ -877,9 +879,11 @@ done:
  *
  * Purpose:     Compare VOL class for a connector
  *
- * Return:      Positive if VALUE1 is greater than VALUE2, negative if
- *              VALUE2 is greater than VALUE1 and zero if VALUE1 and
- *              VALUE2 are equal.
+ * Note:        Sets *cmp_value positive if VALUE1 is greater than VALUE2,
+ *		negative if VALUE2 is greater than VALUE1, and zero if VALUE1
+ *              and VALUE2 are equal (like strcmp).
+ *
+ * Return:      SUCCEED / FAIL
  *
  *-------------------------------------------------------------------------
  */
diff --git a/src/H5VLnative.c b/src/H5VLnative.c
index 3fc1a7c..fe0fd4e 100644
--- a/src/H5VLnative.c
+++ b/src/H5VLnative.c
@@ -11,113 +11,25 @@
  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
 /*
- * Purpose:	The native VOL connector where access is to a single HDF5 file 
+ * Purpose:     The native VOL connector where access is to a single HDF5 file 
  *              using HDF5 VFDs. 
  */
 
-#define H5A_FRIEND              /* Suppress error about including H5Apkg    */
-#define H5D_FRIEND              /* Suppress error about including H5Dpkg    */
-#define H5F_FRIEND              /* Suppress error about including H5Fpkg    */
-#define H5G_FRIEND              /* Suppress error about including H5Gpkg    */
-#define H5L_FRIEND              /* Suppress error about including H5Lpkg    */
-#define H5O_FRIEND              /* Suppress error about including H5Opkg    */
-#define H5R_FRIEND              /* Suppress error about including H5Rpkg    */
-#define H5T_FRIEND              /* Suppress error about including H5Tpkg    */
-
-
 #include "H5private.h"          /* Generic Functions                        */
-#include "H5Apkg.h"             /* Attributes                               */
-#include "H5Dpkg.h"             /* Datasets                                 */
 #include "H5Eprivate.h"         /* Error handling                           */
-#include "H5Fpkg.h"             /* Files                                    */
-#include "H5Gpkg.h"             /* Groups                                   */
 #include "H5Iprivate.h"         /* IDs                                      */
-#include "H5Lpkg.h"             /* Links                                    */
-#include "H5MFprivate.h"        /* File memory management                   */
-#include "H5MMprivate.h"        /* Memory management                        */
-#include "H5Opkg.h"             /* Object headers                           */
 #include "H5Pprivate.h"         /* Property lists                           */
-#include "H5Rpkg.h"             /* References                               */
-#include "H5SMprivate.h"        /* Shared Object Header Messages            */
-#include "H5Tpkg.h"             /* Datatypes                                */
 #include "H5VLprivate.h"        /* Virtual Object Layer                     */
-#include "H5VLnative.h"         /* Native VOL connector                     */
 
-/*
- * The VOL connector identification number.
- */
-static hid_t H5VL_NATIVE_ID_g = H5I_INVALID_HID;
+#include "H5VLnative_private.h" /* Native VOL connector                     */
 
 
+/* The VOL connector identification number */
+static hid_t H5VL_NATIVE_ID_g = H5I_INVALID_HID;
+
 /* Prototypes */
 static herr_t H5VL__native_term(void);
 
-/* Atrribute callbacks */
-static void *H5VL__native_attr_create(void *obj, const H5VL_loc_params_t *loc_params, const char *attr_name, hid_t acpl_id, hid_t aapl_id, hid_t dxpl_id, void **req);
-static void *H5VL__native_attr_open(void *obj, const H5VL_loc_params_t *loc_params, const char *attr_name, hid_t aapl_id, hid_t dxpl_id, void **req);
-static herr_t H5VL__native_attr_read(void *attr, hid_t dtype_id, void *buf, hid_t dxpl_id, void **req);
-static herr_t H5VL__native_attr_write(void *attr, hid_t dtype_id, const void *buf, hid_t dxpl_id, void **req);
-static herr_t H5VL__native_attr_get(void *obj, H5VL_attr_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_attr_specific(void *obj, const H5VL_loc_params_t *loc_params, H5VL_attr_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_attr_optional(void *obj, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_attr_close(void *attr, hid_t dxpl_id, void **req);
-
-/* Dataset callbacks */
-static void *H5VL__native_dataset_create(void *obj, const H5VL_loc_params_t *loc_params, const char *name, hid_t dcpl_id, hid_t dapl_id, hid_t dxpl_id, void **req);
-static void *H5VL__native_dataset_open(void *obj, const H5VL_loc_params_t *loc_params, const char *name, hid_t dapl_id, hid_t dxpl_id, void **req);
-static herr_t H5VL__native_dataset_read(void *dset, hid_t mem_type_id, hid_t mem_space_id,
-                                       hid_t file_space_id, hid_t plist_id, void *buf, void **req);
-static herr_t H5VL__native_dataset_write(void *dset, hid_t mem_type_id, hid_t mem_space_id,
-                                        hid_t file_space_id, hid_t plist_id, const void *buf, void **req);
-static herr_t H5VL__native_dataset_get(void *dset, H5VL_dataset_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_dataset_specific(void *dset, H5VL_dataset_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_dataset_optional(void *dset, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_dataset_close(void *dset, hid_t dxpl_id, void **req);
-
-/* File callbacks */
-static void *H5VL__native_file_create(const char *name, unsigned flags, hid_t fcpl_id, hid_t fapl_id, hid_t dxpl_id, void **req);
-static void *H5VL__native_file_open(const char *name, unsigned flags, hid_t fapl_id, hid_t dxpl_id, void **req);
-static herr_t H5VL__native_file_get(void *file, H5VL_file_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_file_specific(void *file, H5VL_file_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_file_optional(void *file, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_file_close(void *file, hid_t dxpl_id, void **req);
-
-/* Group callbacks */
-static void *H5VL__native_group_create(void *obj, const H5VL_loc_params_t *loc_params, const char *name, hid_t gcpl_id, hid_t gapl_id, hid_t dxpl_id, void **req);
-static void *H5VL__native_group_open(void *obj, const H5VL_loc_params_t *loc_params, const char *name, hid_t gapl_id, hid_t dxpl_id, void **req);
-static herr_t H5VL__native_group_get(void *obj, H5VL_group_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_group_specific(void *obj, H5VL_group_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_group_optional(void *obj, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_group_close(void *grp, hid_t dxpl_id, void **req);
-
-/* Link callbacks */
-static herr_t H5VL__native_link_create(H5VL_link_create_type_t create_type, void *obj, 
-                                      const H5VL_loc_params_t *loc_params, hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req);
-static herr_t H5VL__native_link_copy(void *src_obj, const H5VL_loc_params_t *loc_params1,
-                                    void *dst_obj, const H5VL_loc_params_t *loc_params2,
-                                    hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req);
-static herr_t H5VL__native_link_move(void *src_obj, const H5VL_loc_params_t *loc_params1,
-                                    void *dst_obj, const H5VL_loc_params_t *loc_params2,
-                                    hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req);
-static herr_t H5VL__native_link_get(void *obj, const H5VL_loc_params_t *loc_params, H5VL_link_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_link_specific(void *obj, const H5VL_loc_params_t *loc_params, H5VL_link_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
-
-/* Object callbacks */
-static void *H5VL__native_object_open(void *obj, const H5VL_loc_params_t *loc_params, H5I_type_t *opened_type, hid_t dxpl_id, void **req);
-static herr_t H5VL__native_object_copy(void *src_obj, const H5VL_loc_params_t *loc_params1, const char *src_name, 
-                                      void *dst_obj, const H5VL_loc_params_t *loc_params2, const char *dst_name, 
-                                      hid_t ocpypl_id, hid_t lcpl_id, hid_t dxpl_id, void **req);
-static herr_t H5VL__native_object_get(void *obj, const H5VL_loc_params_t *loc_params, H5VL_object_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_object_specific(void *obj, const H5VL_loc_params_t *loc_params, H5VL_object_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_object_optional(void *obj, hid_t dxpl_id, void **req, va_list arguments);
-
-/* Datatype callbacks */
-static void *H5VL__native_datatype_commit(void *obj, const H5VL_loc_params_t *loc_params, const char *name, hid_t type_id, hid_t lcpl_id, hid_t tcpl_id, hid_t tapl_id, hid_t dxpl_id, void **req);
-static void *H5VL__native_datatype_open(void *obj, const H5VL_loc_params_t *loc_params, const char *name, hid_t tapl_id, hid_t dxpl_id, void **req);
-static herr_t H5VL__native_datatype_get(void *dt, H5VL_datatype_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_datatype_specific(void *dt, H5VL_datatype_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
-static herr_t H5VL__native_datatype_close(void *dt, hid_t dxpl_id, void **req);
-
 /* Native VOL connector class struct */
 static H5VL_class_t H5VL_native_cls_g = {
     H5VL_NATIVE_VERSION,                            /* version      */
@@ -210,7 +122,7 @@ static H5VL_class_t H5VL_native_cls_g = {
 /*-------------------------------------------------------------------------
  * Function:    H5VL_native_register
  *
- * Purpose:	Register the native VOL connector and retrieve an ID for it.
+ * Purpose:     Register the native VOL connector and retrieve an ID for it.
  *
  * Return:      Success:    The ID for the native connector
  *              Failure:    H5I_INVALID_HID
@@ -257,3380 +169,3 @@ H5VL__native_term(void)
     FUNC_LEAVE_NOAPI(SUCCEED)
 } /* end H5VL__native_term() */
 
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_attr_create
- *
- * Purpose:	Creates an attribute on an object.
- *
- * Return:	Success:	Pointer to attribute object
- *		Failure:	NULL
- *
- *-------------------------------------------------------------------------
- */
-static void *
-H5VL__native_attr_create(void *obj, const H5VL_loc_params_t *loc_params, const char *attr_name,
-    hid_t acpl_id, hid_t H5_ATTR_UNUSED aapl_id, hid_t H5_ATTR_UNUSED dxpl_id,
-    void H5_ATTR_UNUSED **req)
-{
-    H5G_loc_t       loc;                /* Object location */
-    H5G_loc_t       obj_loc;            /* Location used to open group */
-    hbool_t         loc_found = FALSE;  
-    H5P_genplist_t  *plist;             /* Property list pointer */
-    hid_t           type_id, space_id;
-    H5T_t	    *type, *dt;         /* Datatype to use for attribute */
-    H5S_t	    *space;             /* Dataspace to use for attribute */
-    H5A_t           *attr = NULL;
-    void            *ret_value = NULL;
-
-    FUNC_ENTER_STATIC
-
-    /* Get the plist structure */
-    if(NULL == (plist = (H5P_genplist_t *)H5I_object(acpl_id)))
-        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, NULL, "can't find object for ID")
-
-    /* get creation properties */
-    if(H5P_get(plist, H5VL_PROP_ATTR_TYPE_ID, &type_id) < 0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get property value for datatype id")
-    if(H5P_get(plist, H5VL_PROP_ATTR_SPACE_ID, &space_id) < 0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get property value for space id")
-
-    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
-    if(0 == (H5F_INTENT(loc.oloc->file) & H5F_ACC_RDWR))
-        HGOTO_ERROR(H5E_ARGS, H5E_WRITEERROR, NULL, "no write intent on file")
-
-    if(NULL == (dt = (H5T_t *)H5I_object_verify(type_id, H5I_DATATYPE)))
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a datatype")
-    /* If this is a named datatype, get the connector's pointer to the datatype */
-    type = H5T_get_actual_type(dt);
-
-    if(NULL == (space = (H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a data space")
-
-    if(loc_params->type == H5VL_OBJECT_BY_SELF) {
-        /* H5Acreate */
-        /* Go do the real work for attaching the attribute to the dataset */
-        if(NULL == (attr = H5A__create(&loc, attr_name, type, space, acpl_id)))
-            HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, NULL, "unable to create attribute")
-    } /* end if */
-    else if(loc_params->type == H5VL_OBJECT_BY_NAME) {
-        /* H5Acreate_by_name */
-        if(NULL == (attr = H5A__create_by_name(&loc, loc_params->loc_data.loc_by_name.name, attr_name, type, space, acpl_id)))
-            HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, NULL, "unable to create attribute")
-    } /* end else-if */
-    else
-        HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, NULL, "unknown attribute create parameters")
-
-    ret_value = (void *)attr;
-
-done:
-    /* Release resources */
-    if(loc_found && H5G_loc_free(&obj_loc) < 0)
-        HDONE_ERROR(H5E_ATTR, H5E_CANTRELEASE, NULL, "can't free location") 
-
-   FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_attr_create() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_attr_open
- *
- * Purpose:	Opens an attr inside a native H5 file.
- *
- * Return:	Success:	Pointer to attribute object
- *		Failure:	NULL
- *
- * Programmer:  Mohamad Chaarawi
- *              March, 2012
- *
- *-------------------------------------------------------------------------
- */
-static void *
-H5VL__native_attr_open(void *obj, const H5VL_loc_params_t *loc_params, const char *attr_name, 
-    hid_t H5_ATTR_UNUSED aapl_id, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
-{
-    H5G_loc_t    loc;             /* Object location */
-    H5A_t        *attr = NULL;    /* Attribute opened */
-    void         *ret_value;
-
-    FUNC_ENTER_STATIC
-
-    /* check arguments */
-    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
-
-    if(loc_params->type == H5VL_OBJECT_BY_SELF) {
-        /* H5Aopen */
-        /* Open the attribute */
-        if(NULL == (attr = H5A__open(&loc, attr_name)))
-            HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, NULL, "unable to open attribute: '%s'", attr_name)
-    } /* end if */
-    else if(loc_params->type == H5VL_OBJECT_BY_NAME) {
-        /* H5Aopen_by_name */
-        /* Open the attribute on the object header */
-        if(NULL == (attr = H5A__open_by_name(&loc, loc_params->loc_data.loc_by_name.name, attr_name)))
-            HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, NULL, "can't open attribute")
-    } /* end else-if */
-    else if(loc_params->type == H5VL_OBJECT_BY_IDX) {
-        /* H5Aopen_by_idx */
-        /* Open the attribute in the object header */
-        if(NULL == (attr = H5A__open_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, 
-                                           loc_params->loc_data.loc_by_idx.idx_type, 
-                                           loc_params->loc_data.loc_by_idx.order, 
-                                           loc_params->loc_data.loc_by_idx.n)))
-            HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, NULL, "unable to open attribute")
-    } /* end else-if */
-    else
-        HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, NULL, "unknown attribute open parameters")
-
-    ret_value = (void *)attr;
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_attr_open() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_attr_read
- *
- * Purpose:	Reads data from attribute.
- *
- * Return:	Non-negative on success/Negative on failure
- *
- * Programmer:  Mohamad Chaarawi
- *              March, 2012
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_attr_read(void *attr, hid_t dtype_id, void *buf,
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
-{
-    H5T_t *mem_type;            /* Memory datatype */
-    herr_t ret_value;           /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    if(NULL == (mem_type = (H5T_t *)H5I_object_verify(dtype_id, H5I_DATATYPE)))
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
-
-    /* Go write the actual data to the attribute */
-    if((ret_value = H5A__read((H5A_t*)attr, mem_type, buf)) < 0)
-        HGOTO_ERROR(H5E_ATTR, H5E_READERROR, FAIL, "unable to read attribute")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_attr_read() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_attr_write
- *
- * Purpose:	Writes data to attribute.
- *
- * Return:	Non-negative on success/Negative on failure
- *
- * Programmer:  Mohamad Chaarawi
- *              March, 2012
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_attr_write(void *attr, hid_t dtype_id, const void *buf,
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
-{
-    H5T_t *mem_type;            /* Memory datatype */
-    herr_t ret_value;           /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    if(NULL == (mem_type = (H5T_t *)H5I_object_verify(dtype_id, H5I_DATATYPE)))
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
-
-    /* Go write the actual data to the attribute */
-    if((ret_value = H5A__write((H5A_t*)attr, mem_type, buf)) < 0)
-        HGOTO_ERROR(H5E_ATTR, H5E_WRITEERROR, FAIL, "unable to write attribute")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_attr_write() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_attr_get
- *
- * Purpose:	Gets information about an attribute
- *
- * Return:	Success:	0
- *		Failure:	-1
- *
- * Programmer:  Mohamad Chaarawi
- *              March, 2012
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_attr_get(void *obj, H5VL_attr_get_t get_type,
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    herr_t      ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    switch(get_type) {
-        /* H5Aget_space */
-        case H5VL_ATTR_GET_SPACE:
-            {
-                hid_t	*ret_id = va_arg(arguments, hid_t *);
-                H5A_t   *attr = (H5A_t *)obj;
-
-                if((*ret_id = H5A_get_space(attr)) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get space ID of attribute")
-                break;
-            }
-
-        /* H5Aget_type */
-        case H5VL_ATTR_GET_TYPE:
-            {
-                hid_t	*ret_id = va_arg(arguments, hid_t *);
-                H5A_t   *attr = (H5A_t *)obj;
-
-                if((*ret_id = H5A__get_type(attr)) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get datatype ID of attribute")
-                break;
-            }
-
-        /* H5Aget_create_plist */
-        case H5VL_ATTR_GET_ACPL:
-            {
-                hid_t	*ret_id = va_arg(arguments, hid_t *);
-                H5A_t   *attr = (H5A_t *)obj;
-
-                if((*ret_id = H5A__get_create_plist(attr)) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get creation property list for attr")
-
-                break;
-            }
-
-        /* H5Aget_name */
-        case H5VL_ATTR_GET_NAME:
-            {
-                const H5VL_loc_params_t *loc_params = va_arg(arguments, const H5VL_loc_params_t *);
-                size_t	buf_size = va_arg(arguments, size_t);
-                char    *buf = va_arg(arguments, char *);
-                ssize_t	*ret_val = va_arg(arguments, ssize_t *);
-                H5A_t   *attr = NULL;
-
-                if(H5VL_OBJECT_BY_SELF == loc_params->type) {
-                    attr = (H5A_t *)obj;
-                    /* Call private function in turn */
-                    if(0 > (*ret_val = H5A__get_name(attr, buf_size, buf)))
-                        HGOTO_ERROR(H5E_ATTR, H5E_CANTGET, FAIL, "can't get attribute name")
-                }
-                else if(H5VL_OBJECT_BY_IDX == loc_params->type) {
-                    H5G_loc_t loc;
-                    
-                    /* check arguments */
-                    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-                        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-                    /* Open the attribute on the object header */
-                    if(NULL == (attr = H5A__open_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, 
-                                                       loc_params->loc_data.loc_by_idx.idx_type, 
-                                                       loc_params->loc_data.loc_by_idx.order, 
-                                                       loc_params->loc_data.loc_by_idx.n)))
-                        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "can't open attribute")
-
-                    /* Get the length of the name */
-                    *ret_val = (ssize_t)HDstrlen(attr->shared->name);
-
-                    /* Copy the name into the user's buffer, if given */
-                    if(buf) {
-                        HDstrncpy(buf, attr->shared->name, MIN((size_t)(*ret_val + 1), buf_size));
-                        if((size_t)(*ret_val) >= buf_size)
-                            buf[buf_size - 1]='\0';
-                    } /* end if */
-
-                    /* Release resources */
-                    if(attr && H5A__close(attr) < 0)
-                        HGOTO_ERROR(H5E_ATTR, H5E_CANTFREE, FAIL, "can't close attribute")
-                }
-                else
-                    HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't get name of attr")
-
-                break;
-            }
-
-        /* H5Aget_info */
-        case H5VL_ATTR_GET_INFO:
-            {
-                const H5VL_loc_params_t *loc_params = va_arg(arguments, const H5VL_loc_params_t *);
-                H5A_info_t   *ainfo = va_arg(arguments, H5A_info_t *);
-                H5A_t   *attr = NULL;
-
-                if(H5VL_OBJECT_BY_SELF == loc_params->type) {
-                    attr = (H5A_t *)obj;
-                    if(H5A__get_info(attr, ainfo) < 0)
-                        HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get attribute info")
-                }
-                else if(H5VL_OBJECT_BY_NAME == loc_params->type) {
-                    char *attr_name = va_arg(arguments, char *);
-                    H5G_loc_t loc;
-                    
-                    /* check arguments */
-                    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-                        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-                    /* Open the attribute on the object header */
-                    if(NULL == (attr = H5A__open_by_name(&loc, loc_params->loc_data.loc_by_name.name, attr_name)))
-                        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "can't open attribute")
-
-                    /* Get the attribute information */
-                    if(H5A__get_info(attr, ainfo) < 0)
-                        HGOTO_ERROR(H5E_ATTR, H5E_CANTGET, FAIL, "unable to get attribute info")
-
-                    /* Release resources */
-                    if(attr && H5A__close(attr) < 0)
-                        HGOTO_ERROR(H5E_ATTR, H5E_CANTFREE, FAIL, "can't close attribute")
-                }
-                else if(H5VL_OBJECT_BY_IDX == loc_params->type) {
-                    H5G_loc_t loc;
-                    
-                    /* check arguments */
-                    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-                        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-                    /* Open the attribute on the object header */
-                    if(NULL == (attr = H5A__open_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, 
-                                                       loc_params->loc_data.loc_by_idx.idx_type, 
-                                                       loc_params->loc_data.loc_by_idx.order, 
-                                                       loc_params->loc_data.loc_by_idx.n)))
-                        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "can't open attribute")
-
-                    /* Get the attribute information */
-                    if(H5A__get_info(attr, ainfo) < 0)
-                        HGOTO_ERROR(H5E_ATTR, H5E_CANTGET, FAIL, "unable to get attribute info")
-
-                    /* Release resources */
-                    if(attr && H5A__close(attr) < 0)
-                        HGOTO_ERROR(H5E_ATTR, H5E_CANTFREE, FAIL, "can't close attribute")
-                }
-                else
-                    HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't get name of attr")
-
-                break;
-            }
-
-        case H5VL_ATTR_GET_STORAGE_SIZE:
-            {
-                hsize_t *ret = va_arg(arguments, hsize_t *);
-                H5A_t   *attr = (H5A_t *)obj;
-
-                /* Set return value */
-                *ret = attr->shared->data_size;
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't get this type of information from attr")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_attr_get() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_attr_specific
- *
- * Purpose:	Specific operation on attribute
- *
- * Return:	Success:	0
- *		Failure:	-1
- *
- * Programmer:  Mohamad Chaarawi
- *              August, 2014
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_attr_specific(void *obj, const H5VL_loc_params_t *loc_params, H5VL_attr_specific_t specific_type, 
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    H5G_loc_t   loc;
-    herr_t      ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    /* Get location for passed-in object */
-    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-    switch(specific_type) {
-        case H5VL_ATTR_DELETE:
-            {
-                char    *attr_name = va_arg(arguments, char *);
-
-                if(H5VL_OBJECT_BY_SELF == loc_params->type) {
-                    /* H5Adelete */
-                    /* Delete the attribute from the location */
-                    if(H5O__attr_remove(loc.oloc, attr_name) < 0)
-                        HGOTO_ERROR(H5E_ATTR, H5E_CANTDELETE, FAIL, "unable to delete attribute")
-                } /* end if */
-                else if(H5VL_OBJECT_BY_NAME == loc_params->type) {
-                    /* H5Adelete_by_name */
-                    /* Delete the attribute */
-                    if(H5A__delete_by_name(&loc, loc_params->loc_data.loc_by_name.name, attr_name) < 0)
-                        HGOTO_ERROR(H5E_ATTR, H5E_CANTDELETE, FAIL, "unable to delete attribute")
-                } /* end else-if */
-                else if(H5VL_OBJECT_BY_IDX == loc_params->type) {
-                    /* H5Adelete_by_idx */
-                    /* Delete the attribute from the location */
-                    if(H5A__delete_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, loc_params->loc_data.loc_by_idx.idx_type,
-                            loc_params->loc_data.loc_by_idx.order, loc_params->loc_data.loc_by_idx.n) < 0)
-                        HGOTO_ERROR(H5E_ATTR, H5E_CANTDELETE, FAIL, "unable to delete attribute")
-                } /* end else-if */
-                else
-                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown attribute remove parameters")
-                break;
-            }
-
-        case H5VL_ATTR_EXISTS:
-            {
-                const char *attr_name = va_arg(arguments, const char *);
-                htri_t	*ret = va_arg(arguments, htri_t *);
-
-                if(loc_params->type == H5VL_OBJECT_BY_SELF) { /* H5Aexists */
-                    /* Check if the attribute exists */
-                    if((*ret = H5O__attr_exists(loc.oloc, attr_name)) < 0)
-                        HGOTO_ERROR(H5E_ATTR, H5E_CANTGET, FAIL, "unable to determine if attribute exists")
-                } /* end if */
-                else if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Aexists_by_name */
-                    /* Check if the attribute exists */
-                    if((*ret = H5A__exists_by_name(loc, loc_params->loc_data.loc_by_name.name, attr_name)) < 0)
-                        HGOTO_ERROR(H5E_ATTR, H5E_CANTGET, FAIL, "unable to determine if attribute exists")
-                } /* end else-if */
-                else
-                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown parameters")
-                break;
-            }
-
-        case H5VL_ATTR_ITER:
-            {
-                H5_index_t          idx_type    = va_arg(arguments, H5_index_t);
-                H5_iter_order_t     order       = va_arg(arguments, H5_iter_order_t);
-                hsize_t            *idx         = va_arg(arguments, hsize_t *);
-                H5A_operator2_t     op          = va_arg(arguments, H5A_operator2_t);
-                void               *op_data     = va_arg(arguments, void *);
-
-                if(loc_params->type == H5VL_OBJECT_BY_SELF) { /* H5Aiterate2 */
-                    /* Iterate over attributes */
-                    if((ret_value = H5A__iterate(&loc, ".", idx_type, order, idx, op, op_data)) < 0)
-                        HGOTO_ERROR(H5E_ATTR, H5E_BADITER, FAIL, "error iterating over attributes")
-                } /* end if */
-                else if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Aiterate_by_name */
-                    /* Iterate over attributes by name */
-                    if((ret_value = H5A__iterate(&loc, loc_params->loc_data.loc_by_name.name, idx_type, order, idx, op, op_data)) < 0)
-                        HGOTO_ERROR(H5E_ATTR, H5E_BADITER, FAIL, "attribute iteration failed");
-                } /* end else-if */
-                else
-                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown parameters")
-                break;
-            }
-
-        /* H5Arename/rename_by_name */
-        case H5VL_ATTR_RENAME:
-            {
-                const char *old_name  = va_arg(arguments, const char *);
-                const char *new_name  = va_arg(arguments, const char *);
-
-                if(loc_params->type == H5VL_OBJECT_BY_SELF) { /* H5Arename */
-                    /* Call attribute rename routine */
-                    if(H5O__attr_rename(loc.oloc, old_name, new_name) < 0)
-                        HGOTO_ERROR(H5E_ATTR, H5E_CANTRENAME, FAIL, "can't rename attribute")
-                } /* end if */
-                else if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Arename_by_name */
-                    /* Call attribute rename routine */
-                    if(H5A__rename_by_name(loc, loc_params->loc_data.loc_by_name.name, old_name, new_name) < 0)
-                        HGOTO_ERROR(H5E_ATTR, H5E_CANTRENAME, FAIL, "can't rename attribute")
-                } /* end else-if */
-                else
-                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown attribute rename parameters")
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid specific operation")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_attr_specific() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_attr_optional
- *
- * Purpose:     Perform a connector-specific operation on a native attribute
- *
- * Return:      SUCCEED/FAIL
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_attr_optional(void H5_ATTR_UNUSED *obj, hid_t H5_ATTR_UNUSED dxpl_id,
-    void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    H5VL_attr_optional_t optional_type;
-    herr_t ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    optional_type = va_arg(arguments, H5VL_attr_optional_t);
-    switch(optional_type) {
-#ifndef H5_NO_DEPRECATED_SYMBOLS
-        case H5VL_ATTR_ITERATE_OLD:
-            {
-                hid_t loc_id = va_arg(arguments, hid_t);
-                unsigned *attr_num = va_arg(arguments, unsigned *);
-                H5A_operator1_t op = va_arg(arguments, H5A_operator1_t);
-                void *op_data = va_arg(arguments, void *);
-
-                /* Call the actual iteration routine */
-                if((ret_value = H5A__iterate_old(loc_id, attr_num, op, op_data)) < 0)
-                    HERROR(H5E_VOL, H5E_BADITER, "error iterating over attributes");
-
-                break;
-            }
-#endif /* H5_NO_DEPRECATED_SYMBOLS */
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid optional operation")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_attr_optional() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_attr_close
- *
- * Purpose:	Closes an attribute.
- *
- * Return:	Success:	0
- *		Failure:	-1, attr not closed.
- *
- * Programmer:  Mohamad Chaarawi
- *              March, 2012
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_attr_close(void *attr, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
-{
-    herr_t ret_value = SUCCEED;                 /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    if(H5A__close((H5A_t*)attr) < 0)
-        HGOTO_ERROR(H5E_SYM, H5E_CANTDEC, FAIL, "can't close attribute")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_attr_close() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_dataset_create
- *
- * Purpose:     Creates a dataset in a native HDF5 file
- *
- * Return:      Success:    Pointer to a dataset struct
- *              Failure:    NULL
- *
- *-------------------------------------------------------------------------
- */
-static void *
-H5VL__native_dataset_create(void *obj, const H5VL_loc_params_t *loc_params,
-    const char *name, hid_t dcpl_id, hid_t dapl_id, hid_t H5_ATTR_UNUSED dxpl_id,
-    void H5_ATTR_UNUSED **req)
-{
-    H5P_genplist_t *plist;              /* Property list pointer */
-    H5G_loc_t	    loc;                 /* Object location to insert dataset into */
-    hid_t           type_id = H5I_INVALID_HID;
-    hid_t           space_id = H5I_INVALID_HID;
-    hid_t           lcpl_id = H5I_INVALID_HID;
-    H5D_t          *dset = NULL;        /* New dataset's info */
-    const H5S_t    *space;              /* Dataspace for dataset */
-    void           *ret_value;
-
-    FUNC_ENTER_STATIC
-
-    /* Get the plist structure */
-    if(NULL == (plist = (H5P_genplist_t *)H5I_object(dcpl_id)))
-        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, NULL, "can't find object for ID")
-
-    /* Get creation properties */
-    if(H5P_get(plist, H5VL_PROP_DSET_TYPE_ID, &type_id) < 0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get property value for datatype id")
-    if(H5P_get(plist, H5VL_PROP_DSET_SPACE_ID, &space_id) < 0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get property value for space id")
-    if(H5P_get(plist, H5VL_PROP_DSET_LCPL_ID, &lcpl_id) < 0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get property value for lcpl id")
-
-    /* Check arguments */
-    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
-    if(H5I_DATATYPE != H5I_get_type(type_id))
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a datatype ID")
-    if(NULL == (space = (const H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a dataspace ID")
-
-    /* H5Dcreate_anon */
-    if(NULL == name) {
-        /* build and open the new dataset */
-        if(NULL == (dset = H5D__create(loc.oloc->file, type_id, space, dcpl_id, dapl_id)))
-            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to create dataset")
-    } /* end if */
-    /* H5Dcreate2 */
-    else {
-        /* Create the new dataset & get its ID */
-        if(NULL == (dset = H5D__create_named(&loc, name, type_id, space, lcpl_id, dcpl_id, dapl_id)))
-            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to create dataset")
-    } /* end else */
-
-    ret_value = (void *)dset;
-
-done:
-    if(NULL == name) {
-        /* Release the dataset's object header, if it was created */
-        if(dset) {
-            H5O_loc_t *oloc;         /* Object location for dataset */
-
-            /* Get the new dataset's object location */
-            if(NULL == (oloc = H5D_oloc(dset)))
-                HDONE_ERROR(H5E_DATASET, H5E_CANTGET, NULL, "unable to get object location of dataset")
-
-            /* Decrement refcount on dataset's object header in memory */
-            if(H5O_dec_rc_by_loc(oloc) < 0)
-                HDONE_ERROR(H5E_DATASET, H5E_CANTDEC, NULL, "unable to decrement refcount on newly created object")
-        } /* end if */
-    } /* end if */
-
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_dataset_create() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_dataset_open
- *
- * Purpose:     Opens a dataset in a native HDF5 file.
- *
- * Return:      Success:    Pointer to a dataset struct
- *              Failure:    NULL
- *
- *-------------------------------------------------------------------------
- */
-static void *
-H5VL__native_dataset_open(void *obj, const H5VL_loc_params_t *loc_params, const char *name, 
-    hid_t dapl_id, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
-{
-    H5D_t       *dset = NULL;
-    H5G_loc_t	 loc;		        /* Object location of group */
-    void         *ret_value = NULL;
-
-    FUNC_ENTER_STATIC
-
-    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
-
-    /* Open the dataset */
-    if(NULL == (dset = H5D__open_name(&loc, name, dapl_id)))
-        HGOTO_ERROR(H5E_DATASET, H5E_CANTOPENOBJ, NULL, "unable to open dataset")
-
-    ret_value = (void *)dset;
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_dataset_open() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_dataset_read
- *
- * Purpose:     Reads raw data from a dataset into a buffer.
- *
- * Return:      SUCCEED/FAIL
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_dataset_read(void *obj, hid_t mem_type_id, hid_t mem_space_id,
-    hid_t file_space_id, hid_t H5_ATTR_UNUSED dxpl_id, void *buf,
-    void H5_ATTR_UNUSED **req)
-{
-    H5D_t         *dset = (H5D_t *)obj;
-    const H5S_t   *mem_space = NULL;
-    const H5S_t   *file_space = NULL;
-    herr_t         ret_value = SUCCEED;                 /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    /* Check arguments */
-    if(NULL == dset->oloc.file)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "dataset is not associated with a file")
-
-    /* Get validated dataspace pointers */
-    if(H5S_get_validated_dataspace(mem_space_id, &mem_space) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "could not get a validated dataspace from mem_space_id")
-    if(H5S_get_validated_dataspace(file_space_id, &file_space) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "could not get a validated dataspace from file_space_id")
-
-    /* Read raw data */
-    if(H5D__read(dset, mem_type_id, mem_space, file_space, buf/*out*/) < 0)
-        HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "can't read data")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_dataset_read() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_dataset_write
- *
- * Purpose:     Writes raw data from a buffer into a dataset.
- *
- * Return:      SUCCEED/FAIL
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_dataset_write(void *obj, hid_t mem_type_id, hid_t mem_space_id,
-    hid_t file_space_id, hid_t H5_ATTR_UNUSED dxpl_id, const void *buf,
-    void H5_ATTR_UNUSED **req)
-{
-    H5D_t           *dset = (H5D_t *)obj;
-    const H5S_t     *mem_space = NULL;
-    const H5S_t     *file_space = NULL;
-    herr_t           ret_value = SUCCEED;        /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    /* check arguments */
-    if(NULL == dset->oloc.file)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "dataset is not associated with a file")
-
-    /* Get validated dataspace pointers */
-    if(H5S_get_validated_dataspace(mem_space_id, &mem_space) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "could not get a validated dataspace from mem_space_id")
-    if(H5S_get_validated_dataspace(file_space_id, &file_space) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "could not get a validated dataspace from file_space_id")
-
-    /* Write the data */
-    if(H5D__write(dset, mem_type_id, mem_space, file_space, buf) < 0) 
-        HGOTO_ERROR(H5E_DATASET, H5E_WRITEERROR, FAIL, "can't write data")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_dataset_write() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_dataset_get
- *
- * Purpose:     Gets certain information about a dataset
- *
- * Return:      SUCCEED/FAIL
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_dataset_get(void *obj, H5VL_dataset_get_t get_type,
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    H5D_t       *dset = (H5D_t *)obj;
-    herr_t       ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    switch(get_type) {
-        /* H5Dget_space */
-        case H5VL_DATASET_GET_SPACE:
-            {
-                hid_t	*ret_id = va_arg(arguments, hid_t *);
-
-                if((*ret_id = H5D__get_space(dset)) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get space ID of dataset")
-
-                break;
-            }
-
-        /* H5Dget_space_statuc */
-        case H5VL_DATASET_GET_SPACE_STATUS:
-            {
-                H5D_space_status_t *allocation = va_arg(arguments, H5D_space_status_t *);
-
-                /* Read data space address and return */
-                if(H5D__get_space_status(dset, allocation) < 0)
-                    HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to get space status")
-
-                break;
-            }
-
-        /* H5Dget_type */
-        case H5VL_DATASET_GET_TYPE:
-            {
-                hid_t	*ret_id = va_arg(arguments, hid_t *);
-
-                if((*ret_id = H5D__get_type(dset)) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get datatype ID of dataset")
-
-                break;
-            }
-
-        /* H5Dget_create_plist */
-        case H5VL_DATASET_GET_DCPL:
-            {
-                hid_t	*ret_id = va_arg(arguments, hid_t *);
-
-                if((*ret_id = H5D_get_create_plist(dset)) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get creation property list for dataset")
-
-                break;
-            }
-
-        /* H5Dget_access_plist */
-        case H5VL_DATASET_GET_DAPL:
-            {
-                hid_t	*ret_id = va_arg(arguments, hid_t *);
-
-                if((*ret_id = H5D_get_access_plist(dset)) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get access property list for dataset")
-
-                break;
-            }
-
-        /* H5Dget_storage_size */
-        case H5VL_DATASET_GET_STORAGE_SIZE:
-            {
-                hsize_t *ret = va_arg(arguments, hsize_t *);
-
-                /* Set return value */
-                if(H5D__get_storage_size(dset, ret) < 0)
-                    HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get size of dataset's storage")
-                break;
-            }
-
-        /* H5Dget_offset */
-        case H5VL_DATASET_GET_OFFSET:
-            {
-                haddr_t *ret = va_arg(arguments, haddr_t *);
-
-                /* Set return value */
-                *ret = H5D__get_offset(dset);
-                if(!H5F_addr_defined(*ret))
-                    *ret = HADDR_UNDEF;
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't get this type of information from dataset")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_dataset_get() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_dataset_specific
- *
- * Purpose:     Specific operation on dataset
- *
- * Return:      SUCCEED/FAIL
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_dataset_specific(void *obj, H5VL_dataset_specific_t specific_type, 
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    H5D_t       *dset = (H5D_t *)obj;
-    herr_t       ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    switch(specific_type) {
-        /* H5Dspecific_space */
-        case H5VL_DATASET_SET_EXTENT:
-            {
-                const hsize_t *size = va_arg(arguments, const hsize_t *); 
-
-                if(H5D__set_extent(dset, size) < 0)
-                    HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to set extent of dataset")
-                break;
-            }
-
-        case H5VL_DATASET_FLUSH:
-            {
-                hid_t dset_id = va_arg(arguments, hid_t);
-
-                /* Flush the dataset */
-                if(H5D__flush(dset, dset_id) < 0)
-                    HGOTO_ERROR(H5E_DATASET, H5E_CANTFLUSH, FAIL, "unable to flush dataset")
-
-                break;
-            }
-
-        case H5VL_DATASET_REFRESH:
-            {
-                hid_t dset_id = va_arg(arguments, hid_t);
-
-                /* Refresh the dataset */
-                if((H5D__refresh(dset_id, dset)) < 0)
-                    HGOTO_ERROR(H5E_DATASET, H5E_CANTLOAD, FAIL, "unable to refresh dataset")
-
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid specific operation")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_dataset_specific() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_dataset_optional
- *
- * Purpose:     Perform a connector-specific operation on a native dataset
- *
- * Return:      SUCCEED/FAIL
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_dataset_optional(void *obj, hid_t H5_ATTR_UNUSED dxpl_id,
-    void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    H5D_t *dset = NULL;             /* Dataset */
-    H5VL_dataset_optional_t optional_type = va_arg(arguments, H5VL_dataset_optional_t);
-    herr_t ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    switch(optional_type) {
-        case H5VL_DATASET_FORMAT_CONVERT:
-            {
-                dset = (H5D_t *)obj;
-
-                switch(dset->shared->layout.type) {
-                    case H5D_CHUNKED:
-                        /* Convert the chunk indexing type to version 1 B-tree if not */
-                        if(dset->shared->layout.u.chunk.idx_type != H5D_CHUNK_IDX_BTREE)
-                            if((H5D__format_convert(dset)) < 0)
-                                HGOTO_ERROR(H5E_DATASET, H5E_CANTLOAD, FAIL, "unable to downgrade chunk indexing type for dataset")
-                        break;
-
-                    case H5D_CONTIGUOUS:
-                    case H5D_COMPACT:
-                        /* Downgrade the layout version to 3 if greater than 3 */
-                        if(dset->shared->layout.version > H5O_LAYOUT_VERSION_DEFAULT)
-                            if((H5D__format_convert(dset)) < 0)
-                                HGOTO_ERROR(H5E_DATASET, H5E_CANTLOAD, FAIL, "unable to downgrade layout version for dataset")
-                        break;
-
-                    case H5D_VIRTUAL:
-                        /* Nothing to do even though layout is version 4 */
-                        break;
-
-                    case H5D_LAYOUT_ERROR:
-                    case H5D_NLAYOUTS:
-                        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid dataset layout type")
-
-                    default: 
-                        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "unknown dataset layout type")
-                } /* end switch */
-
-                break;
-            }
-
-        case H5VL_DATASET_GET_CHUNK_INDEX_TYPE:
-            {
-                H5D_chunk_index_t *idx_type = va_arg(arguments, H5D_chunk_index_t *);
-
-                dset = (H5D_t *)obj;
-
-                /* Make sure the dataset is chunked */
-                if(H5D_CHUNKED != dset->shared->layout.type)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a chunked dataset")
-
-                /* Get the chunk indexing type */
-                *idx_type = dset->shared->layout.u.chunk.idx_type;
-
-                break;
-            }
-
-        case H5VL_DATASET_GET_CHUNK_STORAGE_SIZE:
-            {
-                hsize_t *offset = va_arg(arguments, hsize_t *);
-                hsize_t *chunk_nbytes = va_arg(arguments, hsize_t *);
-
-                dset = (H5D_t *)obj;
-
-                /* Make sure the dataset is chunked */
-                if(H5D_CHUNKED != dset->shared->layout.type)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a chunked dataset")
-
-                /* Call private function */
-                if(H5D__get_chunk_storage_size(dset, offset, chunk_nbytes) < 0)
-                    HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get storage size of chunk")
-
-                break;
-            }
-
-        case H5VL_DATASET_CHUNK_READ:
-            {
-                const       hsize_t *offset     = va_arg(arguments, hsize_t *);
-                uint32_t   *filters             = va_arg(arguments, uint32_t *);
-                void       *buf                 = va_arg(arguments, void *);
-                hsize_t     offset_copy[H5O_LAYOUT_NDIMS];  /* Internal copy of chunk offset */
-
-                dset = (H5D_t *)obj;
-
-                /* Check arguments */
-                if(NULL == dset->oloc.file)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "dataset is not associated with a file")
-                if(H5D_CHUNKED != dset->shared->layout.type)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a chunked dataset")
-
-                /* Copy the user's offset array so we can be sure it's terminated properly.
-                 * (we don't want to mess with the user's buffer).
-                 */
-                if(H5D__get_offset_copy(dset, offset, offset_copy) < 0)
-                    HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "failure to copy offset array")
-
-                /* Read the raw chunk */
-                if(H5D__chunk_direct_read(dset, offset_copy, filters, buf) < 0)
-                    HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "can't read unprocessed chunk data")
-
-                break;
-            }
-
-        case H5VL_DATASET_CHUNK_WRITE:
-            {
-                uint32_t        filters             = va_arg(arguments, uint32_t);
-                const  hsize_t *offset              = va_arg(arguments, const hsize_t *);
-                uint32_t        data_size_32        = va_arg(arguments, uint32_t);
-                const void     *buf                 = va_arg(arguments, const void *);
-                hsize_t         offset_copy[H5O_LAYOUT_NDIMS];  /* Internal copy of chunk offset */
-
-                dset = (H5D_t *)obj;
-
-                /* Check arguments */
-                if(NULL == dset->oloc.file)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "dataset is not associated with a file")
-                if(H5D_CHUNKED != dset->shared->layout.type)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a chunked dataset")
-
-                /* Copy the user's offset array so we can be sure it's terminated properly.
-                 * (we don't want to mess with the user's buffer).
-                 */
-                if(H5D__get_offset_copy(dset, offset, offset_copy) < 0)
-                    HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "failure to copy offset array")
-
-                /* Write chunk */
-                if(H5D__chunk_direct_write(dset, filters, offset_copy, data_size_32, buf) < 0)
-                    HGOTO_ERROR(H5E_DATASET, H5E_WRITEERROR, FAIL, "can't write unprocessed chunk data")
-
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid optional operation")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_dataset_optional() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_dataset_close
- *
- * Purpose:     Closes a dataset.
- *
- * Return:      Success:    SUCCEED
- *              Failure:    FAIL (dataset will not be closed)
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_dataset_close(void *dset, hid_t H5_ATTR_UNUSED dxpl_id,
-    void H5_ATTR_UNUSED **req)
-{
-    herr_t ret_value = SUCCEED;                 /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    if(H5D_close((H5D_t*)dset) < 0)
-        HGOTO_ERROR(H5E_DATASET, H5E_CANTDEC, FAIL, "can't close dataset")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_dataset_close() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_file_create
- *
- * Purpose:     Creates a file as a native HDF5 file.
- *
- * Return:      Success:    A pointer to an H5F_t file struct
- *
- *              Failure:    NULL
- *
- *-------------------------------------------------------------------------
- */
-static void *
-H5VL__native_file_create(const char *name, unsigned flags, hid_t fcpl_id, hid_t fapl_id, 
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
-{
-    H5F_t *new_file = NULL;
-    void  *ret_value = NULL;
-
-    FUNC_ENTER_STATIC
-
-    /* Adjust bit flags by turning on the creation bit and making sure that
-     * the EXCL or TRUNC bit is set.  All newly-created files are opened for
-     * reading and writing.
-     */
-    if(0 == (flags & (H5F_ACC_EXCL|H5F_ACC_TRUNC)))
-        flags |= H5F_ACC_EXCL;	 /*default*/
-    flags |= H5F_ACC_RDWR | H5F_ACC_CREAT;
-
-    /* Create the file */ 
-    if(NULL == (new_file = H5F_open(name, flags, fcpl_id, fapl_id)))
-        HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to create file")
-    new_file->id_exists = TRUE;
-
-    ret_value = (void *)new_file;
-
-done:
-    if(NULL == ret_value && new_file) 
-        if(H5F__close(new_file) < 0)
-            HDONE_ERROR(H5E_FILE, H5E_CANTCLOSEFILE, NULL, "problems closing file")
-
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_file_create() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_file_open
- *
- * Purpose:     Opens a file as a native HDF5 file.
- *
- * Return:      Success:    A pointer to an H5F_t file struct
- *
- *              Failure:    NULL
- *
- *-------------------------------------------------------------------------
- */
-static void *
-H5VL__native_file_open(const char *name, unsigned flags, hid_t fapl_id,
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
-{
-    H5F_t *new_file = NULL;
-    void  *ret_value = NULL;
-
-    FUNC_ENTER_STATIC
-
-    /* Open the file */ 
-    if(NULL == (new_file = H5F_open(name, flags, H5P_FILE_CREATE_DEFAULT, fapl_id)))
-        HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to open file")
-    new_file->id_exists = TRUE;
-
-    ret_value = (void *)new_file;
-
-done:
-    if(NULL == ret_value && new_file && H5F_try_close(new_file, NULL) < 0)
-        HDONE_ERROR(H5E_FILE, H5E_CANTCLOSEFILE, NULL, "problems closing file")
-
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_file_open() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_file_get
- *
- * Purpose:     Get info about a file
- *
- * Return:      SUCCEED/FAIL
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_file_get(void *obj, H5VL_file_get_t get_type,
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    H5F_t       *f = NULL;              /* File struct */
-    herr_t      ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    switch(get_type) {
-        /* H5Fget_access_plist */
-        case H5VL_FILE_GET_FAPL:
-            {
-                H5P_genplist_t *new_plist;              /* New property list */
-                hid_t          *plist_id = va_arg(arguments, hid_t *);
-
-                f = (H5F_t *)obj;
-
-                /* Retrieve the file's access property list */
-                if((*plist_id = H5F_get_access_plist(f, TRUE)) < 0)
-                    HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get file access property list")
-
-                if(NULL == (new_plist = (H5P_genplist_t *)H5I_object(*plist_id)))
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list")
-                break;
-            }
-
-        /* H5Fget_create_plist */
-        case H5VL_FILE_GET_FCPL:
-            {
-                H5P_genplist_t *plist;      /* Property list */
-                hid_t          *plist_id = va_arg(arguments, hid_t *);
-
-                f = (H5F_t *)obj;
-                if(NULL == (plist = (H5P_genplist_t *)H5I_object(f->shared->fcpl_id)))
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list")
-
-                /* Create the property list object to return */
-                if((*plist_id = H5P_copy_plist(plist, TRUE)) < 0)
-                    HGOTO_ERROR(H5E_PLIST, H5E_CANTINIT, FAIL, "unable to copy file creation properties")
-
-                break;
-            }
-
-        /* H5Fget_obj_count */
-        case H5VL_FILE_GET_OBJ_COUNT:
-            {
-                unsigned    types = va_arg(arguments, unsigned);
-                ssize_t    *ret = va_arg(arguments, ssize_t *);
-                size_t      obj_count = 0;      /* Number of opened objects */
-
-                f = (H5F_t *)obj;
-                /* Perform the query */
-                if(H5F_get_obj_count(f, types, TRUE, &obj_count) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_BADITER, FAIL, "H5F_get_obj_count failed")
-
-                /* Set the return value */
-                *ret = (ssize_t)obj_count;
-                break;
-            }
-
-        /* H5Fget_obj_ids */
-        case H5VL_FILE_GET_OBJ_IDS:
-            {
-                unsigned    types = va_arg(arguments, unsigned);
-                size_t      max_objs = va_arg(arguments, size_t);
-                hid_t      *oid_list = va_arg(arguments, hid_t *);
-                ssize_t    *ret = va_arg(arguments, ssize_t *);
-                size_t      obj_count = 0;      /* Number of opened objects */
-
-                f = (H5F_t *)obj;
-                /* Perform the query */
-                if(H5F_get_obj_ids(f, types, max_objs, oid_list, TRUE, &obj_count) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_BADITER, FAIL, "H5F_get_obj_ids failed")
-
-                /* Set the return value */
-                *ret = (ssize_t)obj_count;
-                break;
-            }
-
-        /* H5Fget_intent */
-        case H5VL_FILE_GET_INTENT:
-            {
-                unsigned *intent_flags = va_arg(arguments, unsigned *);
-
-                f = (H5F_t *)obj;
-
-                /* HDF5 uses some flags internally that users don't know about.
-                 * Simplify things for them so that they only get either H5F_ACC_RDWR
-                 * or H5F_ACC_RDONLY and any SWMR flags.
-                 */
-                if(H5F_INTENT(f) & H5F_ACC_RDWR) {
-                    *intent_flags = H5F_ACC_RDWR;
-
-                    /* Check for SWMR write access on the file */
-                    if(H5F_INTENT(f) & H5F_ACC_SWMR_WRITE)
-                        *intent_flags |= H5F_ACC_SWMR_WRITE;
-                } /* end if */
-                else {
-                    *intent_flags = H5F_ACC_RDONLY;
-
-                    /* Check for SWMR read access on the file */
-                    if(H5F_INTENT(f) & H5F_ACC_SWMR_READ)
-                        *intent_flags |= H5F_ACC_SWMR_READ;
-                } /* end else */
-
-                break;
-            }
-
-        /* H5Fget_name */
-        case H5VL_FILE_GET_NAME:
-            {
-                H5I_type_t  type = va_arg(arguments, H5I_type_t);
-                size_t      size = va_arg(arguments, size_t);
-                char       *name = va_arg(arguments, char *);
-                ssize_t    *ret  = va_arg(arguments, ssize_t *);
-                size_t      len;
-
-                if(NULL == (f = H5F__get_file(obj, type)))
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-                len = HDstrlen(H5F_OPEN_NAME(f));
-
-                if(name) {
-                    HDstrncpy(name, H5F_OPEN_NAME(f), MIN(len + 1,size));
-                    if(len >= size)
-                        name[size-1]='\0';
-                } /* end if */
-
-                /* Set the return value for the API call */
-                *ret = (ssize_t)len;
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't get this type of information")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_file_get() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_file_specific
- *
- * Purpose:	Specific operation on file
- *
- * Return:      SUCCEED/FAIL
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_file_specific(void *obj, H5VL_file_specific_t specific_type,
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    herr_t       ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    switch(specific_type) {
-        /* H5Fflush */
-        case H5VL_FILE_FLUSH:
-            {
-                H5I_type_t      type = va_arg(arguments, H5I_type_t);
-                H5F_scope_t     scope = va_arg(arguments, H5F_scope_t);
-                H5F_t	       *f = NULL;              /* File to flush */
-
-                /* Get the file for the object */
-                if(NULL == (f = H5F__get_file(obj, type)))
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-                /* Nothing to do if the file is read only. This determination is
-                 * made at the shared open(2) flags level, implying that opening a
-                 * file twice, once for read-only and once for read-write, and then
-                 * calling H5Fflush() with the read-only handle, still causes data
-                 * to be flushed.
-                 */
-                 if(H5F_ACC_RDWR & H5F_INTENT(f)) {
-                     /* Flush other files, depending on scope */
-                     if(H5F_SCOPE_GLOBAL == scope) {
-                         /* Call the flush routine for mounted file hierarchies */
-                         if(H5F_flush_mounts(f) < 0)
-                             HGOTO_ERROR(H5E_FILE, H5E_CANTFLUSH, FAIL, "unable to flush mounted file hierarchy")
-                     } /* end if */
-                     else {
-                         /* Call the flush routine, for this file */
-                         if(H5F__flush(f) < 0)
-                             HGOTO_ERROR(H5E_FILE, H5E_CANTFLUSH, FAIL, "unable to flush file's cached information")
-                     } /* end else */
-                 } /* end if */
-                break;
-            }
-
-        /* H5Freopen */
-        case H5VL_FILE_REOPEN:
-            {
-                void   **ret        = va_arg(arguments, void **);
-                H5F_t  *new_file    = NULL;
-
-                /* Reopen the file through the VOL connector */
-                if(NULL == (new_file = H5F__reopen((H5F_t *)obj)))
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, FAIL, "unable to reopen file")
-                new_file->id_exists = TRUE;
-
-                *ret = (void *)new_file;
-                break;
-            }
-
-        /* H5Fmount */
-        case H5VL_FILE_MOUNT:
-            {
-                H5I_type_t  type       = va_arg(arguments, H5I_type_t);
-                const char *name       = va_arg(arguments, const char *);
-                H5F_t      *child      = va_arg(arguments, H5F_t *);
-                hid_t       plist_id   = va_arg(arguments, hid_t);
-                H5G_loc_t   loc;
-
-                if(H5G_loc_real(obj, type, &loc) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-                /* Do the mount */
-                if(H5F__mount(&loc, name, child, plist_id) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_MOUNT, FAIL, "unable to mount file")
-
-                break;
-            }
-
-        /* H5Funmount */
-        case H5VL_FILE_UNMOUNT:
-            {
-                H5I_type_t  type       = va_arg(arguments, H5I_type_t);
-                const char *name       = va_arg(arguments, const char *);
-                H5G_loc_t   loc;
-
-                if(H5G_loc_real(obj, type, &loc) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-                /* Unmount */
-                if(H5F__unmount(&loc, name) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_MOUNT, FAIL, "unable to unmount file")
-
-                break;
-            }
-
-        /* H5Fis_accessible */
-        case H5VL_FILE_IS_ACCESSIBLE:
-            {
-                hid_t       fapl_id = va_arg(arguments, hid_t);
-                const char *name    = va_arg(arguments, const char *);
-                htri_t     *ret     = va_arg(arguments, htri_t *);
-
-                /* Call private routine */
-                if((*ret = H5F__is_hdf5(name, fapl_id)) < 0)
-                    HGOTO_ERROR(H5E_IO, H5E_CANTINIT, FAIL, "error in HDF5 file check")
-                break;
-            }
-
-        /* H5Fcreate / H5Fopen */
-        case H5VL_FILE_CACHE_VOL_CONN:
-            {
-                hid_t      vol_id   = va_arg(arguments, hid_t);
-                void      *vol_info = va_arg(arguments, void *);
-
-                /* Call private routine */
-                if(H5F__set_vol_conn((H5F_t *)obj, vol_id, vol_info) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "cache VOL connector ID & info failed")
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid specific operation")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_file_specific() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_file_optional
- *
- * Purpose:     Perform a connector-specific operation on a native file
- *
- * Return:      SUCCEED/FAIL
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_file_optional(void *obj, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    H5F_t *f = NULL;           /* File */
-    H5VL_file_optional_t optional_type = va_arg(arguments, H5VL_file_optional_t);
-    herr_t ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    f = (H5F_t *)obj;
-    switch(optional_type) {
-        /* H5Fget_filesize */
-        case H5VL_FILE_GET_SIZE:
-            {
-                haddr_t     max_eof_eoa;            /* Maximum of the EOA & EOF */
-                haddr_t     base_addr;              /* Base address for the file */
-                hsize_t    *size = va_arg(arguments, hsize_t *);
-
-                /* Go get the actual file size */
-                if(H5F__get_max_eof_eoa(f, &max_eof_eoa) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "file can't get max eof/eoa ")
-
-                base_addr = H5FD_get_base_addr(f->shared->lf);
-
-                if(size)
-                    *size = (hsize_t)(max_eof_eoa + base_addr);     /* Convert relative base address for file to absolute address */
-
-                break;
-            }
-
-        /* H5Fget_file_image */
-        case H5VL_FILE_GET_FILE_IMAGE:
-            {
-                void       *buf_ptr   = va_arg(arguments, void *);
-                ssize_t    *ret       = va_arg(arguments, ssize_t *);
-                size_t      buf_len   = va_arg(arguments, size_t );
-
-                /* Do the actual work */
-                if((*ret = H5F__get_file_image(f, buf_ptr, buf_len)) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "get file image failed")
-                break;
-            }
-
-        /* H5Fget_freespace */
-        case H5VL_FILE_GET_FREE_SPACE:
-            {
-                hsize_t	tot_space;	/* Amount of free space in the file */
-                hssize_t    *ret = va_arg(arguments, hssize_t *);
-
-                /* Go get the actual amount of free space in the file */
-                if(H5MF_get_freespace(f, &tot_space, NULL) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to check free space for file")
-                *ret = (hssize_t)tot_space;
-                break;
-            }
-
-        case H5VL_FILE_GET_FREE_SECTIONS:
-            {
-                H5F_sect_info_t *sect_info = va_arg(arguments, H5F_sect_info_t *);
-                ssize_t         *ret       = va_arg(arguments, ssize_t *);
-                H5F_mem_t       type       = va_arg(arguments, H5F_mem_t);
-                size_t          nsects     = va_arg(arguments, size_t);
-
-                /* Go get the free-space section information in the file */
-                if((*ret = H5MF_get_free_sections(f, type, nsects, sect_info)) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to check free space for file")
-                break;
-            }
-
-        /* H5Fget_info2 */
-        case H5VL_FILE_GET_INFO:
-            {
-                H5I_type_t  type   = va_arg(arguments, H5I_type_t);
-                H5F_info2_t *finfo = va_arg(arguments, H5F_info2_t *);
-
-                /* Get the file struct. This call is careful to not return the file pointer
-                 * for the top file in a mount hierarchy.
-                 */
-                if(NULL == (f = H5F__get_file(obj, type)))
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "could not get a file struct")
-
-                /* Get the file info */
-                if(H5F__get_info(f, finfo) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to retrieve file info")
-
-                break;
-            }
-
-        /* H5Fget_mdc_config */
-        case H5VL_FILE_GET_MDC_CONF:
-            {
-                H5AC_cache_config_t *config_ptr = va_arg(arguments, H5AC_cache_config_t *);
-
-                /* Go get the resize configuration */
-                if(H5AC_get_cache_auto_resize_config(f->shared->cache, config_ptr) < 0)
-                    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "H5AC_get_cache_auto_resize_config() failed.")
-                break;
-            }
-
-        /* H5Fget_mdc_hit_rate */
-        case H5VL_FILE_GET_MDC_HR:
-            {
-                double *hit_rate_ptr = va_arg(arguments, double *);
-
-                /* Go get the current hit rate */
-                if(H5AC_get_cache_hit_rate(f->shared->cache, hit_rate_ptr) < 0)
-                    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "H5AC_get_cache_hit_rate() failed.")
-                break;
-            }
-
-        /* H5Fget_mdc_size */
-        case H5VL_FILE_GET_MDC_SIZE:
-            {
-                size_t *max_size_ptr        = va_arg(arguments, size_t *);
-                size_t *min_clean_size_ptr  = va_arg(arguments, size_t *);
-                size_t *cur_size_ptr        = va_arg(arguments, size_t *); 
-                int    *cur_num_entries_ptr = va_arg(arguments, int *); 
-                uint32_t cur_num_entries;
-
-                /* Go get the size data */
-                if(H5AC_get_cache_size(f->shared->cache, max_size_ptr, min_clean_size_ptr, 
-                                       cur_size_ptr, &cur_num_entries) < 0)
-                    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "H5AC_get_cache_size() failed.")
-
-                if(cur_num_entries_ptr != NULL)
-                    *cur_num_entries_ptr = (int)cur_num_entries;
-                break;
-            }
-
-        /* H5Fget_vfd_handle */
-        case H5VL_FILE_GET_VFD_HANDLE:
-            {
-                void **file_handle  = va_arg(arguments, void **);
-                hid_t  fapl_id      = va_arg(arguments, hid_t);
-
-                /* Retrieve the VFD handle for the file */
-                if(H5F_get_vfd_handle(f, fapl_id, file_handle) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't retrieve VFD handle")
-                break;
-            }
-
-        /* H5Iget_file_id */
-        case H5VL_FILE_GET_FILE_ID:
-            {
-                H5I_type_t  type = va_arg(arguments, H5I_type_t);
-                hid_t      *file_id = va_arg(arguments, hid_t *);
-
-                if(NULL == (f = H5F__get_file(obj, type)))
-                    HGOTO_ERROR(H5E_FILE, H5E_BADTYPE, FAIL, "not a file or file object")
-                if((*file_id = H5F__get_file_id(f)) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't get file ID")
-                break;
-            }
-
-        /* H5Fclear_elink_file_cache */
-        case H5VL_FILE_CLEAR_ELINK_CACHE:
-            {
-                /* Release the EFC */
-                if(f->shared->efc)
-                    if(H5F__efc_release(f->shared->efc) < 0)
-                        HGOTO_ERROR(H5E_FILE, H5E_CANTRELEASE, FAIL, "can't release external file cache")
-                break;
-            }
-
-        /* H5Freset_mdc_hit_rate_stats */
-        case H5VL_FILE_RESET_MDC_HIT_RATE:
-            {
-                /* Reset the hit rate statistic */
-                if(H5AC_reset_cache_hit_rate_stats(f->shared->cache) < 0)
-                    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "can't reset cache hit rate")
-                break;
-            }
-
-        case H5VL_FILE_SET_MDC_CONFIG:
-            {
-                H5AC_cache_config_t *config_ptr = va_arg(arguments, H5AC_cache_config_t *);
-
-                /* set the resize configuration  */
-                if(H5AC_set_cache_auto_resize_config(f->shared->cache, config_ptr) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "H5AC_set_cache_auto_resize_config() failed")
-                break;
-            }
-
-        case H5VL_FILE_GET_METADATA_READ_RETRY_INFO:
-            {
-                H5F_retry_info_t *info = va_arg(arguments, H5F_retry_info_t *);
-
-                if(H5F_get_metadata_read_retry_info(f, info) < 0)
-                    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "can't get metadata read retry info")
-
-                break;
-            }
-
-        case H5VL_FILE_START_SWMR_WRITE:
-            {
-                if(H5F__start_swmr_write(f) < 0)
-                    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "can't start SWMR write")
-
-                break;
-            }
-
-        case H5VL_FILE_START_MDC_LOGGING:
-            {
-                /* Call mdc logging function */
-                if(H5C_start_logging(f->shared->cache) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_LOGFAIL, FAIL, "unable to start mdc logging")
-
-                break;
-            }
-
-        case H5VL_FILE_STOP_MDC_LOGGING:
-            {
-                /* Call mdc logging function */
-                if(H5C_stop_logging(f->shared->cache) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_LOGFAIL, FAIL, "unable to stop mdc logging")
-
-                break;
-            }
-
-        case H5VL_FILE_GET_MDC_LOGGING_STATUS:
-            {
-                hbool_t *is_enabled				= va_arg(arguments, hbool_t *);
-                hbool_t *is_currently_logging	= va_arg(arguments, hbool_t *);
-
-                /* Call mdc logging function */
-                if(H5C_get_logging_status(f->shared->cache, is_enabled, is_currently_logging) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_LOGFAIL, FAIL, "unable to get logging status")
-
-                break;
-            }
-
-        case H5VL_FILE_FORMAT_CONVERT:
-            {
-                /* Convert the format */
-                if(H5F__format_convert(f) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTCONVERT, FAIL, "can't convert file format")
-
-                break;
-            }
-
-        case H5VL_FILE_RESET_PAGE_BUFFERING_STATS:
-            {
-                /* Sanity check */
-                if(NULL == f->shared->page_buf)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "page buffering not enabled on file")
-
-                /* Reset the statistics */
-                if (H5PB_reset_stats(f->shared->page_buf) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't reset stats for page buffering")
-
-                break;
-            }
-
-        case H5VL_FILE_GET_PAGE_BUFFERING_STATS:
-            {
-                unsigned *accesses      = va_arg(arguments, unsigned *);
-                unsigned *hits          = va_arg(arguments, unsigned *);
-                unsigned *misses        = va_arg(arguments, unsigned *);
-                unsigned *evictions     = va_arg(arguments, unsigned *);
-                unsigned *bypasses      = va_arg(arguments, unsigned *);
-                
-                /* Sanity check */
-                if(NULL == f->shared->page_buf)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "page buffering not enabled on file")
-
-                /* Get the statistics */
-                if(H5PB_get_stats(f->shared->page_buf, accesses, hits, misses, evictions, bypasses) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't retrieve stats for page buffering")
-
-                break;
-            }
-
-        case H5VL_FILE_GET_MDC_IMAGE_INFO:
-            {
-                haddr_t *image_addr = va_arg(arguments, haddr_t *);
-                hsize_t *image_len = va_arg(arguments, hsize_t *);
-
-                /* Go get the address and size of the cache image */
-                if(H5AC_get_mdc_image_info(f->shared->cache, image_addr, image_len) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't retrieve cache image info")
-
-                break;
-            }
-
-        case H5VL_FILE_GET_EOA:
-            {
-                haddr_t *eoa = va_arg(arguments, haddr_t *);
-                haddr_t rel_eoa;        /* Relative address of EOA */
-
-                /* Sanity check */
-                HDassert(eoa);
-
-                /* This routine will work only for drivers with this feature enabled.*/
-                /* We might introduce a new feature flag in the future */
-                if(!H5F_HAS_FEATURE(f, H5FD_FEAT_SUPPORTS_SWMR_IO))
-                    HGOTO_ERROR(H5E_FILE, H5E_BADVALUE, FAIL, "must use a SWMR-compatible VFD for this public routine")
-
-                /* The real work */
-                if(HADDR_UNDEF == (rel_eoa = H5F_get_eoa(f, H5FD_MEM_DEFAULT)))
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "get_eoa request failed")
-
-                /* Set return value */
-                /* (Note compensating for base address subtraction in internal routine) */
-                *eoa = rel_eoa + H5F_get_base_addr(f);
-
-                break;
-            }
-
-        case H5VL_FILE_INCR_FILESIZE:
-            {
-                hsize_t increment = va_arg(arguments, hsize_t);
-                haddr_t max_eof_eoa;        /* Maximum of the relative EOA & EOF */
-
-                /* This public routine will work only for drivers with this feature enabled.*/
-                /* We might introduce a new feature flag in the future */
-                if(!H5F_HAS_FEATURE(f, H5FD_FEAT_SUPPORTS_SWMR_IO))
-                    HGOTO_ERROR(H5E_FILE, H5E_BADVALUE, FAIL, "must use a SWMR-compatible VFD for this public routine")
-
-                /* Get the maximum of EOA and EOF */
-                if(H5F__get_max_eof_eoa(f, &max_eof_eoa) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "file can't get max eof/eoa ")
-
-                /* Set EOA to the maximum value + increment */
-                if(H5F__set_eoa(f, H5FD_MEM_DEFAULT, max_eof_eoa + increment) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "driver set_eoa request failed")
-
-                break;
-            }
-
-        case H5VL_FILE_SET_LIBVER_BOUNDS:
-            {
-                H5F_libver_t low = va_arg(arguments, H5F_libver_t);
-                H5F_libver_t high = va_arg(arguments, H5F_libver_t);
-
-                /* Call internal set_libver_bounds function */
-                if(H5F__set_libver_bounds(f, low, high) < 0)
-                    HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "cannot set low/high bounds")
-
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid optional operation")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_file_optional() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_file_close
- *
- * Purpose:     Closes a file.
- *
- * Return:      SUCCEED/FAIL (the file will not be closed on failure)
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_file_close(void *file, hid_t H5_ATTR_UNUSED dxpl_id,
-    void H5_ATTR_UNUSED **req)
-{
-    int     nref;
-    H5F_t   *f          = (H5F_t *)file;
-    hid_t   file_id     = H5I_INVALID_HID;
-    herr_t  ret_value   = SUCCEED;                  /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    /* This routine should only be called when a file ID's ref count drops to zero */
-    HDassert(H5F_ID_EXISTS(f));
-
-    /* Flush file if this is the last reference to this id and we have write
-     * intent, unless it will be flushed by the "shared" file being closed.
-     * This is only necessary to replicate previous behaviour, and could be
-     * disabled by an option/property to improve performance.
-     */
-    if((H5F_NREFS(f) > 1) && (H5F_INTENT(f) & H5F_ACC_RDWR)) {
-        /* Get the file ID corresponding to the H5F_t struct */
-        if(H5I_find_id(f, H5I_FILE, &file_id) < 0 || H5I_INVALID_HID == file_id)
-            HGOTO_ERROR(H5E_ATOM, H5E_CANTGET, FAIL, "invalid atom")
-
-        /* Get the number of references outstanding for this file ID */
-        if((nref = H5I_get_ref(file_id, FALSE)) < 0)
-            HGOTO_ERROR(H5E_ATOM, H5E_CANTGET, FAIL, "can't get ID ref count")
-        if(nref == 1)
-            if(H5F__flush(f) < 0)
-                HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "unable to flush cache")
-    } /* end if */
-
-    /* Close the file */
-    if(H5F__close(f) < 0)
-        HGOTO_ERROR(H5E_FILE, H5E_CANTDEC, FAIL, "can't close file")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_file_close() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_group_create
- *
- * Purpose:     Creates a group inside a native h5 file.
- *
- * Return:      Success:    Pointer to a group struct
- *
- *              Failure:    NULL
- *
- *-------------------------------------------------------------------------
- */
-static void *
-H5VL__native_group_create(void *obj, const H5VL_loc_params_t *loc_params, const char *name,
-    hid_t gcpl_id, hid_t H5_ATTR_UNUSED gapl_id, hid_t H5_ATTR_UNUSED dxpl_id,
-    void H5_ATTR_UNUSED **req)
-{
-    H5P_genplist_t *plist;              /* Property list pointer        */
-    H5G_loc_t       loc;                /* Location to create group     */
-    H5G_t          *grp = NULL;         /* New group created            */
-    hid_t           lcpl_id;
-    void           *ret_value;
-
-    FUNC_ENTER_STATIC
-
-    /* Get the property list structure */
-    if(NULL == (plist = (H5P_genplist_t *)H5I_object(gcpl_id)))
-        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, NULL, "can't find object for ID")
-
-    /* Get creation properties */
-    if(H5P_get(plist, H5VL_PROP_GRP_LCPL_ID, &lcpl_id) < 0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get property value for lcpl id")
-
-    /* Set up the location */
-    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
-
-    /* if name is NULL then this is from H5Gcreate_anon */
-    if(name == NULL) {
-        H5G_obj_create_t gcrt_info;         /* Information for group creation */
-
-        /* Set up group creation info */
-        gcrt_info.gcpl_id = gcpl_id;
-        gcrt_info.cache_type = H5G_NOTHING_CACHED;
-        HDmemset(&gcrt_info.cache, 0, sizeof(gcrt_info.cache));
-
-        /* Create the new group & get its ID */
-        if(NULL == (grp = H5G__create(loc.oloc->file, &gcrt_info)))
-            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, NULL, "unable to create group")            
-    } /* end if */
-    /* otherwise it's from H5Gcreate */
-    else {
-        /* Create the new group & get its ID */
-        if(NULL == (grp = H5G__create_named(&loc, name, lcpl_id, gcpl_id)))
-            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, NULL, "unable to create group")
-    } /* end else */
-
-    ret_value = (void *)grp;
-
-done:
-    if(name == NULL) {
-        /* Release the group's object header, if it was created */
-        if(grp) {
-            H5O_loc_t *oloc;         /* Object location for group */
-
-            /* Get the new group's object location */
-            if(NULL == (oloc = H5G_oloc(grp)))
-                HDONE_ERROR(H5E_SYM, H5E_CANTGET, NULL, "unable to get object location of group")
-
-            /* Decrement refcount on group's object header in memory */
-            if(H5O_dec_rc_by_loc(oloc) < 0)
-                HDONE_ERROR(H5E_SYM, H5E_CANTDEC, NULL, "unable to decrement refcount on newly created object")
-         } /* end if */
-    } /* end if */
-
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_group_create() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_group_open
- *
- * Purpose:     Opens a group inside a native h5 file.
- *
- * Return:      Success:    Pointer to a group struct
- *
- *              Failure:    NULL
- *
- *-------------------------------------------------------------------------
- */
-static void *
-H5VL__native_group_open(void *obj, const H5VL_loc_params_t *loc_params, const char *name, 
-    hid_t H5_ATTR_UNUSED gapl_id, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
-{
-    H5G_loc_t       loc;                /* Location to open group   */
-    H5G_t          *grp = NULL;         /* New group opend          */
-    void           *ret_value;
-
-    FUNC_ENTER_STATIC
-
-    /* Set up the location */
-    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
-
-    /* Open the group */
-    if((grp = H5G__open_name(&loc, name)) == NULL)
-        HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, NULL, "unable to open group")
-
-    ret_value = (void *)grp;
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_group_open() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_group_get
- *
- * Purpose:     Get info about a group
- *
- * Return:      SUCCEED/FAIL
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_group_get(void *obj, H5VL_group_get_t get_type,
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    herr_t      ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    switch(get_type) {
-        /* H5Gget_create_plist */
-        case H5VL_GROUP_GET_GCPL:
-            {
-                hid_t      *new_gcpl_id     = va_arg(arguments, hid_t *);
-                H5G_t      *grp             = (H5G_t *)obj;
-
-                if((*new_gcpl_id = H5G_get_create_plist(grp)) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get creation property list for group")
-                break;
-            }
-
-        /* H5Gget_info */
-        case H5VL_GROUP_GET_INFO:
-            {
-                const H5VL_loc_params_t  *loc_params  = va_arg(arguments, const H5VL_loc_params_t *);
-                H5G_info_t         *group_info  = va_arg(arguments, H5G_info_t *);
-                H5G_loc_t           loc;
-
-                if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-                if(loc_params->type == H5VL_OBJECT_BY_SELF) {
-                    /* H5Gget_info */
-
-                    /* Retrieve the group's information */
-                    if(H5G__obj_info(loc.oloc, group_info) < 0)
-                        HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't retrieve group info")
-                } /* end if */
-                else if(loc_params->type == H5VL_OBJECT_BY_NAME) {
-                    /* H5Gget_info_by_name */
-
-                    /* Retrieve the group's information */
-                    if(H5G__get_info_by_name(&loc, loc_params->loc_data.loc_by_name.name, group_info) < 0)
-                        HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't retrieve group info")
-                } /* end else-if */
-                else if(loc_params->type == H5VL_OBJECT_BY_IDX) {
-                    /* H5Gget_info_by_idx */
-
-                    /* Retrieve the group's information */
-                    if(H5G__get_info_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, loc_params->loc_data.loc_by_idx.idx_type,
-                            loc_params->loc_data.loc_by_idx.order, loc_params->loc_data.loc_by_idx.n, group_info) < 0)
-                        HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't retrieve group info")
-                } /* end else-if */
-                else
-                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown get info parameters")
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't get this type of information from group")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_group_get() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_group_specific
- *
- * Purpose:     Specific operations for groups
- *
- * Return:      SUCCEED/FAIL
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_group_specific(void *obj, H5VL_group_specific_t specific_type, 
-                             hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    H5G_t       *grp = (H5G_t *)obj;
-    herr_t       ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    switch(specific_type) {
-        case H5VL_GROUP_FLUSH:
-            {
-                hid_t group_id = va_arg(arguments, hid_t);
-
-                /* Flush object's metadata to file */
-                if(H5O_flush_common(&grp->oloc, group_id) < 0)
-                    HGOTO_ERROR(H5E_SYM, H5E_CANTFLUSH, FAIL, "unable to flush group")
-
-                break;
-            }
-
-        case H5VL_GROUP_REFRESH:
-            {
-                hid_t group_id = va_arg(arguments, hid_t);
-
-                /* Call private function to refresh group object */
-                if((H5O_refresh_metadata(group_id, grp->oloc)) < 0)
-                    HGOTO_ERROR(H5E_SYM, H5E_CANTLOAD, FAIL, "unable to refresh group")
-
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid specific operation")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_group_specific() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_group_optional
- *
- * Purpose:     Perform a connector-specific operation on a native group
- *
- * Return:      SUCCEED/FAIL
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_group_optional(void *obj, hid_t H5_ATTR_UNUSED dxpl_id,
-    void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    H5VL_group_optional_t optional_type;
-    herr_t ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    optional_type = va_arg(arguments, H5VL_group_optional_t);
-    switch(optional_type) {
-#ifndef H5_NO_DEPRECATED_SYMBOLS
-        /* H5Giterate (deprecated) */
-        case H5VL_GROUP_ITERATE_OLD:
-            {
-                const H5VL_loc_params_t *loc_params = va_arg(arguments, const H5VL_loc_params_t *);
-                hsize_t idx = va_arg(arguments, hsize_t);
-                hsize_t *last_obj = va_arg(arguments, hsize_t *);
-                const H5G_link_iterate_t *lnk_op = va_arg(arguments, const H5G_link_iterate_t *);
-                void *op_data = va_arg(arguments, void *);
-                H5G_loc_t grp_loc;
-
-                /* Get the location struct for the object */
-                if(H5G_loc_real(obj, loc_params->obj_type, &grp_loc) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-                /* Call the actual iteration routine */
-                if((ret_value = H5G_iterate(&grp_loc, loc_params->loc_data.loc_by_name.name, H5_INDEX_NAME, H5_ITER_INC, idx, last_obj, lnk_op, op_data)) < 0)
-                    HERROR(H5E_VOL, H5E_BADITER, "error iterating over group's links");
-
-                break;
-            }
-
-        /* H5Gget_objinfo (deprecated) */
-        case H5VL_GROUP_GET_OBJINFO:
-            {
-                const H5VL_loc_params_t *loc_params = va_arg(arguments, const H5VL_loc_params_t *);
-                hbool_t follow_link = va_arg(arguments, unsigned);
-                H5G_stat_t *statbuf = va_arg(arguments, H5G_stat_t *);
-                H5G_loc_t grp_loc;
-
-                /* Get the location struct for the object */
-                if(H5G_loc_real(obj, loc_params->obj_type, &grp_loc) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-                /* Call the actual group objinfo routine */
-                if(H5G__get_objinfo(&grp_loc, loc_params->loc_data.loc_by_name.name, follow_link, statbuf) < 0)
-                    HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "cannot stat object")
-
-                break;
-            }
-#endif /* H5_NO_DEPRECATED_SYMBOLS */
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid optional operation")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_group_optional() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_group_close
- *
- * Purpose:     Closes a group.
- *
- * Return:      SUCCEED/FAIL (the group will not be closed on failure)
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_group_close(void *grp, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
-{
-    herr_t ret_value = SUCCEED;                 /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    if(H5G_close((H5G_t *)grp) < 0)
-        HGOTO_ERROR(H5E_SYM, H5E_CLOSEERROR, FAIL, "can't close group")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_group_close() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_link_create
- *
- * Purpose:	Creates an hard/soft/UD/external links.
- *
- * Return:	Non-negative on success/Negative on failure
- *
- * Programmer:  Mohamad Chaarawi
- *              April, 2012
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_link_create(H5VL_link_create_type_t create_type, void *obj,
-    const H5VL_loc_params_t *loc_params, hid_t lcpl_id, hid_t H5_ATTR_UNUSED lapl_id,
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
-{
-    H5P_genplist_t   *plist;                     /* Property list pointer */
-    herr_t           ret_value = SUCCEED;        /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    /* Get the plist structure */
-    if(NULL == (plist = (H5P_genplist_t *)H5I_object(lcpl_id)))
-        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID");
-
-    switch(create_type) {
-        case H5VL_LINK_CREATE_HARD:
-            {
-                H5G_loc_t    cur_loc;
-                H5G_loc_t    link_loc;
-                void         *cur_obj;
-                H5VL_loc_params_t cur_params;
-
-                if(H5P_get(plist, H5VL_PROP_LINK_TARGET, &cur_obj) < 0)
-                    HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get property value for current location id")
-                if(H5P_get(plist, H5VL_PROP_LINK_TARGET_LOC_PARAMS, &cur_params) < 0)
-                    HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get property value for current name")
-
-                if(NULL != cur_obj && H5G_loc_real(cur_obj, cur_params.obj_type, &cur_loc) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-                if(NULL != obj && H5G_loc_real(obj, loc_params->obj_type, &link_loc) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-                /* H5Lcreate_hard */
-                if(H5VL_OBJECT_BY_NAME == cur_params.type) {
-                    H5G_loc_t *cur_loc_p, *link_loc_p;
-
-                    /* Set up current & new location pointers */
-                    cur_loc_p = &cur_loc;
-                    link_loc_p = &link_loc;
-                    if(NULL == cur_obj)
-                        cur_loc_p = link_loc_p;
-                    else if(NULL == obj)
-                        link_loc_p = cur_loc_p;
-                    else if(cur_loc_p->oloc->file != link_loc_p->oloc->file)
-                        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "source and destination should be in the same file.")
-
-                    /* Create the link */
-                    if((ret_value = H5L_create_hard(cur_loc_p, cur_params.loc_data.loc_by_name.name, 
-                                                    link_loc_p, loc_params->loc_data.loc_by_name.name, lcpl_id)) < 0)
-                        HGOTO_ERROR(H5E_LINK, H5E_CANTINIT, FAIL, "unable to create link")
-                } /* end if */
-                else { /* H5Olink */
-                    /* Link to the object */
-                    if(H5L_link(&link_loc, loc_params->loc_data.loc_by_name.name, &cur_loc, lcpl_id) < 0)
-                        HGOTO_ERROR(H5E_OHDR, H5E_CANTINIT, FAIL, "unable to create link")
-                } /* end else */
-                break;
-            }
-
-        case H5VL_LINK_CREATE_SOFT:
-            {
-                char        *target_name;
-                H5G_loc_t   link_loc;               /* Group location for new link */
-
-                if(H5G_loc_real(obj, loc_params->obj_type, &link_loc) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-                if(H5P_get(plist, H5VL_PROP_LINK_TARGET_NAME, &target_name) < 0)
-                    HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get property value for targe name")
-
-                /* Create the link */
-                if((ret_value = H5L_create_soft(target_name, &link_loc, loc_params->loc_data.loc_by_name.name, lcpl_id)) < 0)
-                    HGOTO_ERROR(H5E_LINK, H5E_CANTINIT, FAIL, "unable to create link")
-                break;
-            }
-
-        case H5VL_LINK_CREATE_UD:
-            {
-                H5G_loc_t   link_loc;               /* Group location for new link */
-                H5L_type_t link_type;
-                void *udata;
-                size_t udata_size;
-
-                if(H5G_loc_real(obj, loc_params->obj_type, &link_loc) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-                if(H5P_get(plist, H5VL_PROP_LINK_TYPE, &link_type) < 0)
-                    HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get property value for link type")
-                if(H5P_get(plist, H5VL_PROP_LINK_UDATA, &udata) < 0)
-                    HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get property value for udata")
-                if(H5P_get(plist, H5VL_PROP_LINK_UDATA_SIZE, &udata_size) < 0)
-                    HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get property value for udata size")
-
-                /* Create link */
-                if(H5L__create_ud(&link_loc, loc_params->loc_data.loc_by_name.name, udata, udata_size, 
-                                 link_type, lcpl_id) < 0)
-                    HGOTO_ERROR(H5E_LINK, H5E_CANTINIT, FAIL, "unable to create link")
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_LINK, H5E_CANTINIT, FAIL, "invalid link creation call")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_link_create() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_link_copy
- *
- * Purpose:	Renames an object within an HDF5 file and copies it to a new
- *              group.  The original name SRC is unlinked from the group graph
- *              and then inserted with the new name DST (which can specify a
- *              new path for the object) as an atomic operation. The names
- *              are interpreted relative to SRC_LOC_ID and
- *              DST_LOC_ID, which are either file IDs or group ID.
- *
- * Return:	Non-negative on success/Negative on failure
- *
- * Programmer:  Mohamad Chaarawi
- *              April, 2012
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_link_copy(void *src_obj, const H5VL_loc_params_t *loc_params1, 
-    void *dst_obj, const H5VL_loc_params_t *loc_params2, hid_t lcpl_id,
-    hid_t H5_ATTR_UNUSED lapl_id, hid_t H5_ATTR_UNUSED dxpl_id,
-    void H5_ATTR_UNUSED **req)
-{
-    H5G_loc_t	src_loc, *src_loc_p;
-    H5G_loc_t	dst_loc, *dst_loc_p;
-    herr_t      ret_value = SUCCEED;        /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    if(NULL != src_obj && H5G_loc_real(src_obj, loc_params1->obj_type, &src_loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-    if(NULL != dst_obj && H5G_loc_real(dst_obj, loc_params2->obj_type, &dst_loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-    /* Set up src & dst location pointers */
-    src_loc_p = &src_loc;
-    dst_loc_p = &dst_loc;
-    if(NULL == src_obj)
-        src_loc_p = dst_loc_p;
-    else if(NULL == dst_obj)
-        dst_loc_p = src_loc_p;
-
-    /* Copy the link */
-    if(H5L_move(src_loc_p, loc_params1->loc_data.loc_by_name.name, 
-                dst_loc_p, loc_params2->loc_data.loc_by_name.name, 
-                TRUE, lcpl_id) < 0)
-        HGOTO_ERROR(H5E_LINK, H5E_CANTCOPY, FAIL, "unable to copy link")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_link_copy() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_link_move
- *
- * Purpose:	Renames an object within an HDF5 file and moves it to a new
- *              group.  The original name SRC is unlinked from the group graph
- *              and then inserted with the new name DST (which can specify a
- *              new path for the object) as an atomic operation. The names
- *              are interpreted relative to SRC_LOC_ID and
- *              DST_LOC_ID, which are either file IDs or group ID.
- *
- * Return:	Non-negative on success/Negative on failure
- *
- * Programmer:  Mohamad Chaarawi
- *              April, 2012
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_link_move(void *src_obj, const H5VL_loc_params_t *loc_params1, 
-    void *dst_obj, const H5VL_loc_params_t *loc_params2, hid_t lcpl_id,
-    hid_t H5_ATTR_UNUSED lapl_id, hid_t H5_ATTR_UNUSED dxpl_id,
-    void H5_ATTR_UNUSED **req)
-{
-    H5G_loc_t	src_loc, *src_loc_p;
-    H5G_loc_t	dst_loc, *dst_loc_p;
-    herr_t      ret_value = SUCCEED;        /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    if(NULL != src_obj && H5G_loc_real(src_obj, loc_params1->obj_type, &src_loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-    if(NULL != dst_obj && H5G_loc_real(dst_obj, loc_params2->obj_type, &dst_loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-    /* Set up src & dst location pointers */
-    src_loc_p = &src_loc;
-    dst_loc_p = &dst_loc;
-    if(NULL == src_obj)
-        src_loc_p = dst_loc_p;
-    else if(NULL == dst_obj)
-        dst_loc_p = src_loc_p;
-
-    /* Move the link */
-    if(H5L_move(src_loc_p, loc_params1->loc_data.loc_by_name.name, 
-                dst_loc_p, loc_params2->loc_data.loc_by_name.name, 
-                FALSE, lcpl_id) < 0)
-        HGOTO_ERROR(H5E_LINK, H5E_CANTMOVE, FAIL, "unable to move link")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_link_move() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_link_get
- *
- * Purpose:	Get info about a link
- *
- * Return:	Success:	0
- *		Failure:	-1
- *
- * Programmer:  Mohamad Chaarawi
- *              April, 2012
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_link_get(void *obj, const H5VL_loc_params_t *loc_params, H5VL_link_get_t get_type, 
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    H5G_loc_t	loc;
-    herr_t      ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-    switch(get_type) {
-        /* H5Lget_info/H5Lget_info_by_idx */
-        case H5VL_LINK_GET_INFO:
-            {
-                H5L_info_t *linfo  = va_arg(arguments, H5L_info_t *);
-
-                /* Get the link information */
-                if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Lget_info */
-                    if(H5L_get_info(&loc, loc_params->loc_data.loc_by_name.name, linfo) < 0)
-                        HGOTO_ERROR(H5E_LINK, H5E_NOTFOUND, FAIL, "unable to get link info")
-                } /* end if */
-                else if(loc_params->type == H5VL_OBJECT_BY_IDX) { /* H5Lget_info_by_idx */
-                    if(H5L_get_info_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, loc_params->loc_data.loc_by_idx.idx_type,
-                            loc_params->loc_data.loc_by_idx.order, loc_params->loc_data.loc_by_idx.n, linfo) < 0)
-                        HGOTO_ERROR(H5E_LINK, H5E_NOTFOUND, FAIL, "unable to get link info")
-                } /* end else-if */
-                else
-                    HGOTO_ERROR(H5E_LINK, H5E_NOTFOUND, FAIL, "unable to get link info")
-                break;
-            }
-
-        /* H5Lget_name_by_idx */
-        case H5VL_LINK_GET_NAME:
-            {
-                char       *name   = va_arg(arguments, char *);
-                size_t      size   = va_arg(arguments, size_t);
-                ssize_t    *ret    = va_arg(arguments, ssize_t *);
-
-                /* Get the link name */
-                if((*ret = H5L_get_name_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, loc_params->loc_data.loc_by_idx.idx_type,
-                            loc_params->loc_data.loc_by_idx.order, loc_params->loc_data.loc_by_idx.n, name, size)) < 0)
-                    HGOTO_ERROR(H5E_LINK, H5E_NOTFOUND, FAIL, "unable to get link info")
-
-                break;
-            }
-
-        /* H5Lget_val/H5Lget_val_by_idx */
-        case H5VL_LINK_GET_VAL:
-            {
-                void       *buf    = va_arg(arguments, void *);
-                size_t     size    = va_arg(arguments, size_t);
-
-                /* Get the link information */
-                if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Lget_val */
-                    if(H5L_get_val(&loc, loc_params->loc_data.loc_by_name.name, buf, size) < 0)
-                        HGOTO_ERROR(H5E_LINK, H5E_NOTFOUND, FAIL, "unable to get link value")
-                }
-                else if(loc_params->type == H5VL_OBJECT_BY_IDX) { /* H5Lget_val_by_idx */
-
-                    if(H5L_get_val_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, loc_params->loc_data.loc_by_idx.idx_type,
-                            loc_params->loc_data.loc_by_idx.order, loc_params->loc_data.loc_by_idx.n, buf, size) < 0)
-                        HGOTO_ERROR(H5E_LINK, H5E_NOTFOUND, FAIL, "unable to get link val")                    
-                }
-                else
-                    HGOTO_ERROR(H5E_LINK, H5E_NOTFOUND, FAIL, "unable to get link val")
-
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't get this type of information from link")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_link_get() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_link_specific
- *
- * Purpose:	Specific operation on a link
- *
- * Return:	Success:	0
- *		Failure:	-1
- *
- * Programmer:  Mohamad Chaarawi
- *              April, 2012
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_link_specific(void *obj, const H5VL_loc_params_t *loc_params, H5VL_link_specific_t specific_type, 
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    herr_t      ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    switch(specific_type) {
-        case H5VL_LINK_EXISTS:
-            {
-                htri_t *ret = va_arg(arguments, htri_t *);
-                H5G_loc_t loc;
-
-                if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-                /* Check for the existence of the link */
-                if((*ret = H5L_exists(&loc, loc_params->loc_data.loc_by_name.name)) < 0)
-                    HGOTO_ERROR(H5E_LINK, H5E_NOTFOUND, FAIL, "unable to specific link info")
-                break;
-            }
-
-        case H5VL_LINK_ITER:
-            {
-                H5G_loc_t loc;
-                hbool_t recursive = va_arg(arguments, int);                     
-                H5_index_t idx_type = va_arg(arguments, H5_index_t);
-                H5_iter_order_t order = va_arg(arguments, H5_iter_order_t);
-                hsize_t *idx_p = va_arg(arguments, hsize_t *);
-                H5L_iterate_t op = va_arg(arguments, H5L_iterate_t);
-                void *op_data = va_arg(arguments, void *);
-
-                /* Get the location */
-                if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
-
-                /* Visit or iterate over the links */
-                if(loc_params->type == H5VL_OBJECT_BY_SELF) {
-                    if(recursive) {
-                        /* H5Lvisit */
-                        if((ret_value = H5G_visit(&loc, ".", idx_type, order, op, op_data)) < 0)
-                            HGOTO_ERROR(H5E_LINK, H5E_BADITER, FAIL, "link visitation failed")
-                    } /* end if */
-                    else {
-                        /* H5Literate */
-                        if((ret_value = H5L_iterate(&loc, ".", idx_type, order, idx_p, op, op_data)) < 0)
-                            HGOTO_ERROR(H5E_LINK, H5E_BADITER, FAIL, "error iterating over links")
-                    } /* end else */
-                } /* end if */
-                else if(loc_params->type == H5VL_OBJECT_BY_NAME) {
-                    if(recursive) {
-                        /* H5Lvisit_by_name */
-                        if((ret_value = H5G_visit(&loc, loc_params->loc_data.loc_by_name.name, idx_type, order, op, op_data)) < 0)
-                            HGOTO_ERROR(H5E_LINK, H5E_BADITER, FAIL, "link visitation failed")
-                    } /* end if */
-                    else {
-                        /* H5Literate_by_name */
-                        if((ret_value = H5L_iterate(&loc, loc_params->loc_data.loc_by_name.name, idx_type, order, idx_p, op, op_data)) < 0)
-                            HGOTO_ERROR(H5E_LINK, H5E_BADITER, FAIL, "error iterating over links")
-                    } /* end else */
-                } /* end else-if */
-                else
-                    HGOTO_ERROR(H5E_LINK, H5E_UNSUPPORTED, FAIL, "unknown link iterate params")
-
-                break;
-            }
-
-        case H5VL_LINK_DELETE:
-            {
-                H5G_loc_t loc;
-
-                if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-                /* Unlink */
-                if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Ldelete */
-                    if(H5L_delete(&loc, loc_params->loc_data.loc_by_name.name) < 0)
-                        HGOTO_ERROR(H5E_LINK, H5E_CANTDELETE, FAIL, "unable to delete link")
-                } /* end if */
-                else if(loc_params->type == H5VL_OBJECT_BY_IDX) { /* H5Ldelete_by_idx */
-                    if(H5L_delete_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, loc_params->loc_data.loc_by_idx.idx_type,
-                            loc_params->loc_data.loc_by_idx.order, loc_params->loc_data.loc_by_idx.n) < 0)
-                        HGOTO_ERROR(H5E_LINK, H5E_CANTDELETE, FAIL, "unable to delete link")
-                } /* end else-if */
-                else
-                    HGOTO_ERROR(H5E_LINK, H5E_CANTDELETE, FAIL, "unable to delete link")
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid specific operation")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_link_specific() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_object_open
- *
- * Purpose:	Opens an object inside a native h5 file.
- *
- * Return:	Success:	object id. 
- *		Failure:	NULL
- *
- * Programmer:  Mohamad Chaarawi
- *              March, 2012
- *
- *-------------------------------------------------------------------------
- */
-static void *
-H5VL__native_object_open(void *obj, const H5VL_loc_params_t *loc_params, H5I_type_t *opened_type, 
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
-{
-    H5G_loc_t   loc;
-    void       *ret_value = NULL;
-
-    FUNC_ENTER_STATIC
-
-    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
-
-    switch(loc_params->type) {
-        case H5VL_OBJECT_BY_NAME:
-            {
-                /* Open the object */
-                if(NULL == (ret_value = H5O_open_name(&loc, loc_params->loc_data.loc_by_name.name, opened_type)))
-                    HGOTO_ERROR(H5E_OHDR, H5E_CANTOPENOBJ, NULL, "unable to open object by name")
-                break;
-            }
-
-        case H5VL_OBJECT_BY_IDX:
-            {
-                /* Open the object */
-                if(NULL == (ret_value = H5O_open_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, loc_params->loc_data.loc_by_idx.idx_type,
-                        loc_params->loc_data.loc_by_idx.order, loc_params->loc_data.loc_by_idx.n, opened_type)))
-                    HGOTO_ERROR(H5E_OHDR, H5E_CANTOPENOBJ, NULL, "unable to open object by index")
-                break;
-            }
-
-        case H5VL_OBJECT_BY_ADDR:
-            {
-                /* Open the object */
-                if(NULL == (ret_value = H5O_open_by_addr(&loc, loc_params->loc_data.loc_by_addr.addr, opened_type)))
-                    HGOTO_ERROR(H5E_OHDR, H5E_CANTOPENOBJ, NULL, "unable to open object by address")
-                break;
-            }
-
-        case H5VL_OBJECT_BY_REF:
-            {
-                hid_t temp_id = H5I_INVALID_HID;
-                H5F_t *file = NULL;
-
-                /* Get the file pointer from the entry */
-                file = loc.oloc->file;
-
-                /* Create reference */
-                if((temp_id = H5R__dereference(file, loc_params->loc_data.loc_by_ref.lapl_id, 
-                                              loc_params->loc_data.loc_by_ref.ref_type, 
-                                              loc_params->loc_data.loc_by_ref._ref)) < 0)
-                    HGOTO_ERROR(H5E_REFERENCE, H5E_CANTOPENOBJ, NULL, "unable to dereference object")
-
-                *opened_type = H5I_get_type(temp_id);
-                if(NULL == (ret_value = H5I_remove(temp_id)))
-                    HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, NULL, "unable to open object")
-                break;
-            }
-
-        case H5VL_OBJECT_BY_SELF:
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, NULL, "unknown open parameters")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_object_open() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_object_copy
- *
- * Purpose:	Copies an object inside a native h5 file.
- *
- * Return:	Success:	0
- *		Failure:	-1
- *
- * Programmer:  Mohamad Chaarawi
- *              March, 2012
- *
- *-------------------------------------------------------------------------
- */
-static herr_t 
-H5VL__native_object_copy(void *src_obj, const H5VL_loc_params_t *loc_params1, const char *src_name, 
-    void *dst_obj, const H5VL_loc_params_t *loc_params2, const char *dst_name, 
-    hid_t ocpypl_id, hid_t lcpl_id, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
-{
-    H5G_loc_t	src_loc;                /* Source object group location */
-    H5G_loc_t	dst_loc;                /* Destination group location */
-    herr_t      ret_value = FAIL;
-    
-    FUNC_ENTER_STATIC
-
-    /* get location for objects */
-    if(H5G_loc_real(src_obj, loc_params1->obj_type, &src_loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-    if(H5G_loc_real(dst_obj, loc_params2->obj_type, &dst_loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-    /* Copy the object */
-    if((ret_value = H5O_copy(&src_loc, src_name, &dst_loc, dst_name, ocpypl_id, lcpl_id)) < 0)
-        HGOTO_ERROR(H5E_SYM, H5E_CANTCOPY, FAIL, "unable to copy object")    
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_object_copy() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_object_get
- *
- * Purpose:     Gets certain data about an object
- *
- * Return:      SUCCEED/FAIL
- *
- * Programmer:  Mohamad Chaarawi
- *              March, 2012
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_object_get(void *obj, const H5VL_loc_params_t *loc_params, H5VL_object_get_t get_type, 
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    herr_t      ret_value = SUCCEED;    /* Return value */
-    H5G_loc_t	loc;                    /* Location of group */
-
-    FUNC_ENTER_STATIC
-
-    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-    switch(get_type) {
-        /* H5Rget_region */
-        case H5VL_REF_GET_REGION:
-            {
-                hid_t       *ret                    =  va_arg(arguments, hid_t *);
-                H5R_type_t  H5_ATTR_UNUSED ref_type =  va_arg(arguments, H5R_type_t);
-                void        *ref                    =  va_arg(arguments, void *);
-                H5S_t       *space = NULL;    /* Dataspace object */
-
-                /* Get the dataspace with the correct region selected */
-                if((space = H5R__get_region(loc.oloc->file, ref)) == NULL)
-                    HGOTO_ERROR(H5E_REFERENCE, H5E_CANTGET, FAIL, "unable to retrieve region")
-
-                /* Atomize */
-                if((*ret = H5I_register(H5I_DATASPACE, space, TRUE)) < 0)
-                    HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register dataspace atom")
-
-                break;
-            }
-
-        /* H5Rget_obj_type2 */
-        case H5VL_REF_GET_TYPE:
-            {
-                H5O_type_t  *obj_type  =  va_arg(arguments, H5O_type_t *);
-                H5R_type_t  ref_type   =  va_arg(arguments, H5R_type_t);
-                void        *ref       =  va_arg(arguments, void *);
-
-                /* Get the object information */
-                if(H5R__get_obj_type(loc.oloc->file, ref_type, ref, obj_type) < 0)
-                    HGOTO_ERROR(H5E_REFERENCE, H5E_CANTGET, FAIL, "unable to determine object type")
-                break;
-            }
-
-        /* H5Rget_name */
-        case H5VL_REF_GET_NAME:
-            {
-                ssize_t     *ret       = va_arg(arguments, ssize_t *);
-                char        *name      = va_arg(arguments, char *);
-                size_t      size       = va_arg(arguments, size_t);
-                H5R_type_t  ref_type   = va_arg(arguments, H5R_type_t);
-                void        *ref       = va_arg(arguments, void *);
-
-                /* Get name */
-                if((*ret = H5R__get_name(loc.oloc->file, ref_type, ref, name, size)) < 0)
-                    HGOTO_ERROR(H5E_REFERENCE, H5E_CANTGET, FAIL, "unable to determine object path")
-                break;
-            }
-
-        /* H5Iget_name */
-        case H5VL_ID_GET_NAME:
-            {
-                ssize_t *ret = va_arg(arguments, ssize_t *);
-                char *name = va_arg(arguments, char *);
-                size_t size = va_arg(arguments, size_t);
-
-                /* Retrieve object's name */
-                if((*ret = H5G_get_name(&loc, name, size, NULL)) < 0)
-                    HGOTO_ERROR(H5E_ATOM, H5E_CANTGET, FAIL, "can't retrieve object name")
-
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't get this type of information from object")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_object_get() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_object_specific
- *
- * Purpose:	Specific operation on an object
- *
- * Return:      SUCCEED/FAIL
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_object_specific(void *obj, const H5VL_loc_params_t *loc_params, H5VL_object_specific_t specific_type, 
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    H5G_loc_t    loc;
-    herr_t       ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-    switch(specific_type) {
-        /* H5Oincr_refcount / H5Odecr_refcount */
-        case H5VL_OBJECT_CHANGE_REF_COUNT:
-            {
-                int update_ref  = va_arg(arguments, int);
-                H5O_loc_t  *oloc = loc.oloc;
-
-                if(H5O_link(oloc, update_ref) < 0)
-                    HGOTO_ERROR(H5E_OHDR, H5E_LINKCOUNT, FAIL, "modifying object link count failed")
-
-                break;
-            }
-
-        /* H5Oexists_by_name */
-        case H5VL_OBJECT_EXISTS:
-            {
-                htri_t *ret = va_arg(arguments, htri_t *);
-
-                if(loc_params->type == H5VL_OBJECT_BY_NAME) {
-                    /* Check if the object exists */
-                    if((*ret = H5G_loc_exists(&loc, loc_params->loc_data.loc_by_name.name)) < 0)
-                        HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "unable to determine if '%s' exists", loc_params->loc_data.loc_by_name.name)
-                } /* end if */
-                else
-                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown object exists parameters")
-                break;
-            }
-
-        case H5VL_OBJECT_VISIT:
-            {
-                H5_index_t idx_type     = va_arg(arguments, H5_index_t);
-                H5_iter_order_t order   = va_arg(arguments, H5_iter_order_t);
-                H5O_iterate_t op        = va_arg(arguments, H5O_iterate_t);
-                void *op_data           = va_arg(arguments, void *);
-                unsigned fields         = va_arg(arguments, unsigned);
-
-                /* Call internal object visitation routine */
-                if(loc_params->type == H5VL_OBJECT_BY_SELF) {
-                    /* H5Ovisit */
-                    if((ret_value = H5O__visit(&loc, ".", idx_type, order, op, op_data, fields)) < 0)
-                        HGOTO_ERROR(H5E_OHDR, H5E_BADITER, FAIL, "object visitation failed")
-                } /* end if */
-                else if(loc_params->type == H5VL_OBJECT_BY_NAME) {
-                    /* H5Ovisit_by_name */
-                    if((ret_value = H5O__visit(&loc, loc_params->loc_data.loc_by_name.name, idx_type, order, op, op_data, fields)) < 0)
-                        HGOTO_ERROR(H5E_OHDR, H5E_BADITER, FAIL, "object visitation failed")
-                } /* end else-if */
-                else
-                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown object visit params");
-                break;
-            }
-
-        case H5VL_OBJECT_FLUSH:
-            {
-                hid_t   oid     = va_arg(arguments, hid_t);
-
-                /* Flush the object's metadata */
-                if(H5O_flush(loc.oloc, oid) < 0)
-                    HGOTO_ERROR(H5E_OHDR, H5E_CANTFLUSH, FAIL, "unable to flush object")
-
-                break;
-            }
-
-        case H5VL_OBJECT_REFRESH:
-            {
-                hid_t                   oid         = va_arg(arguments, hid_t);
-                H5O_loc_t              *oloc        = loc.oloc;
-
-                /* Refresh the metadata */
-                if(H5O_refresh_metadata(oid, *oloc) < 0)
-                    HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, FAIL, "unable to refresh object")
-
-                break;
-            }
-
-        case H5VL_REF_CREATE:
-            {
-                void        *ref      = va_arg(arguments, void *);
-                const char  *name     = va_arg(arguments, char *);
-                H5R_type_t  ref_type  = va_arg(arguments, H5R_type_t);
-                hid_t       space_id  = va_arg(arguments, hid_t);
-                H5S_t       *space = NULL;   /* Pointer to dataspace containing region */
-                
-                if(space_id != (-1) && (NULL == (space = (H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE))))
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataspace")
-
-                /* Create reference */
-                if(H5R__create(ref, &loc, name, ref_type, space) < 0)
-                    HGOTO_ERROR(H5E_REFERENCE, H5E_CANTCREATE, FAIL, "unable to create reference")
-
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't recognize this operation type")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_object_specific() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_object_optional
- *
- * Purpose:	Perform a connector-specific operation for an objectibute
- *
- * Return:	Success:	0
- *		Failure:	-1
- *
- * Programmer:  Mohamad Chaarawi
- *              April, 2012
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_object_optional(void *obj, hid_t H5_ATTR_UNUSED dxpl_id,
-    void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    H5VL_object_optional_t optional_type = va_arg(arguments, H5VL_object_optional_t);
-    H5VL_loc_params_t *loc_params = va_arg(arguments, H5VL_loc_params_t *);
-    H5G_loc_t	loc;                    /* Location of group */
-    herr_t       ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
-
-    switch(optional_type) {
-        /* H5Oget_info / H5Oget_info_by_name / H5Oget_info_by_idx */
-        case H5VL_OBJECT_GET_INFO:
-            {
-                H5O_info_t  *obj_info = va_arg(arguments, H5O_info_t *);
-                unsigned fields         = va_arg(arguments, unsigned);
-
-                if(loc_params->type == H5VL_OBJECT_BY_SELF) { /* H5Oget_info */
-                    /* Retrieve the object's information */
-                    if(H5G_loc_info(&loc, ".", obj_info, fields) < 0)
-                        HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "object not found")
-                } /* end if */
-                else if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Oget_info_by_name */
-                    /* Retrieve the object's information */
-                    if(H5G_loc_info(&loc, loc_params->loc_data.loc_by_name.name, obj_info, fields) < 0)
-                        HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "object not found")
-                } /* end else-if */
-                else if(loc_params->type == H5VL_OBJECT_BY_IDX) { /* H5Oget_info_by_idx */
-                    H5G_loc_t   obj_loc;                /* Location used to open group */
-                    H5G_name_t  obj_path;            	/* Opened object group hier. path */
-                    H5O_loc_t   obj_oloc;            	/* Opened object object location */
-
-                    /* Set up opened group location to fill in */
-                    obj_loc.oloc = &obj_oloc;
-                    obj_loc.path = &obj_path;
-                    H5G_loc_reset(&obj_loc);
-
-                    /* Find the object's location, according to the order in the index */
-                    if(H5G_loc_find_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, 
-                                           loc_params->loc_data.loc_by_idx.idx_type, 
-                                           loc_params->loc_data.loc_by_idx.order, 
-                                           loc_params->loc_data.loc_by_idx.n, &obj_loc/*out*/) < 0)
-                        HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "group not found")
-
-                    /* Retrieve the object's information */
-                    if(H5O_get_info(obj_loc.oloc, obj_info, fields) < 0) {
-                        H5G_loc_free(&obj_loc);
-                        HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't retrieve object info")
-                    } /* end if */
-
-                    /* Release the object location */
-                    if(H5G_loc_free(&obj_loc) < 0)
-                        HGOTO_ERROR(H5E_OHDR, H5E_CANTRELEASE, FAIL, "can't free location")
-                } /* end else-if */
-                else
-                    HGOTO_ERROR(H5E_OHDR, H5E_UNSUPPORTED, FAIL, "unknown get info parameters")
-                break;
-            }
-
-        /* H5Oget_comment / H5Oget_comment_by_name */
-        case H5VL_OBJECT_GET_COMMENT:
-            {
-                char     *comment =  va_arg(arguments, char *);
-                size_t   bufsize  =  va_arg(arguments, size_t);
-                ssize_t  *ret     =  va_arg(arguments, ssize_t *);
-
-                /* Retrieve the object's comment */
-                if(loc_params->type == H5VL_OBJECT_BY_SELF) { /* H5Oget_comment */
-                    if((*ret = H5G_loc_get_comment(&loc, ".", comment/*out*/, bufsize)) < 0)
-                        HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "object not found")
-                } /* end if */
-                else if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Oget_comment_by_name */
-                    if((*ret = H5G_loc_get_comment(&loc, loc_params->loc_data.loc_by_name.name, comment/*out*/, bufsize)) < 0)
-                        HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "object not found")
-                } /* end else-if */
-                else
-                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown set_coment parameters")
-                break;
-            }
-
-        /* H5Oset_comment */
-        case H5VL_OBJECT_SET_COMMENT:
-            {
-                const char    *comment  = va_arg(arguments, char *);
-
-                if(loc_params->type == H5VL_OBJECT_BY_SELF) { /* H5Oset_comment */
-                    /* (Re)set the object's comment */
-                    if(H5G_loc_set_comment(&loc, ".", comment) < 0)
-                        HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "object not found")
-                } /* end if */
-                else if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Oset_comment_by_name */
-                    /* (Re)set the object's comment */
-                    if(H5G_loc_set_comment(&loc, loc_params->loc_data.loc_by_name.name, comment) < 0)
-                        HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "object not found")
-                } /* end else-if */
-                else
-                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown set_coment parameters")
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't perform this operation on object");       
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_object_optional() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_datatype_commit
- *
- * Purpose:	Commits a datatype inside a native h5 file.
- *
- * Return:	Success:	datatype id. 
- *		Failure:	NULL
- *
- * Programmer:  Mohamad Chaarawi
- *              March, 2012
- *
- *-------------------------------------------------------------------------
- */
-static void *
-H5VL__native_datatype_commit(void *obj, const H5VL_loc_params_t *loc_params, const char *name,
-    hid_t type_id, hid_t lcpl_id, hid_t tcpl_id, hid_t H5_ATTR_UNUSED tapl_id,
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
-{
-    H5G_loc_t	loc;                    /* Location to commit datatype */
-    H5T_t	*dt;                    /* Datatype for ID */
-    H5T_t	*type = NULL;           /* copy of the original type which will be committed */
-    void        *ret_value = NULL;      /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    /* check arguments */
-    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
-
-    if(NULL == (dt = (H5T_t *)H5I_object_verify(type_id, H5I_DATATYPE)))
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a datatype")
-
-    /* Check arguments.  We cannot commit an immutable type because H5Tclose()
-     * normally fails on such types (try H5Tclose(H5T_NATIVE_INT)) but closing
-     * a named type should always succeed.
-     */
-    if(H5T_STATE_NAMED == dt->shared->state || H5T_STATE_OPEN == dt->shared->state)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "datatype is already committed")
-    if(H5T_STATE_IMMUTABLE == dt->shared->state)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "datatype is immutable")
-
-    /* Check for a "sensible" datatype to store on disk */
-    if(H5T_is_sensible(dt) <= 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "datatype is not sensible")
-
-    /* Copy the datatype - the copied one will be the type that is
-     * committed, and attached to original datatype above the VOL
-     * layer
-     */
-    if(NULL == (type = H5T_copy(dt, H5T_COPY_TRANSIENT)))
-        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "unable to copy");
-
-    /* Commit the datatype */
-    if(NULL != name) {
-        /* H5Tcommit */
-        if(H5T__commit_named(&loc, name, type, lcpl_id, tcpl_id) < 0)
-            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "unable to commit datatype")
-    } /* end if */
-    else {
-        /* H5Tcommit_anon */
-        if(H5T__commit_anon(loc.oloc->file, type, tcpl_id) < 0)
-            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "unable to commit datatype")
-    } /* end else */
-
-    ret_value = (void *)type;
-
-done:
-    if(NULL == ret_value && type)
-        H5T_close(type);
-
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_datatype_commit() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_datatype_open
- *
- * Purpose:     Opens a named datatype inside a native h5 file.
- *
- * Return:      Success:    datatype pointer
- *              Failure:    NULL
- *
- *-------------------------------------------------------------------------
- */
-static void *
-H5VL__native_datatype_open(void *obj, const H5VL_loc_params_t *loc_params, const char *name, 
-    hid_t H5_ATTR_UNUSED tapl_id, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
-{
-    H5T_t       *type = NULL;           /* Datatype opened in file */
-    H5G_loc_t    loc;                   /* Group location of object to open */
-    void        *ret_value = NULL;
-
-    FUNC_ENTER_STATIC
-
-    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
-
-    /* Open the datatype */
-    if(NULL == (type = H5T__open_name(&loc, name)))
-        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTOPENOBJ, NULL, "unable to open named datatype")
-
-    type->vol_obj = NULL;
-
-    ret_value = (void *)type;
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_datatype_open() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_datatype_get
- *
- * Purpose:	Get information about a datatype
- *
- * Return:	Success:	0
- *		Failure:	-1
- *
- * Programmer:  Mohamad Chaarawi
- *              June, 2013
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_datatype_get(void *obj, H5VL_datatype_get_t get_type, 
-    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    H5T_t       *dt = (H5T_t *)obj;
-    herr_t       ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    switch (get_type) {
-        case H5VL_DATATYPE_GET_BINARY:
-            {
-                ssize_t *nalloc = va_arg(arguments, ssize_t *);
-                void *buf = va_arg(arguments, void *);
-                size_t size = va_arg(arguments, size_t);
-
-                if(H5T_encode(dt, (unsigned char *)buf, &size) < 0)
-                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "can't determine serialized length of datatype")
-
-                *nalloc = (ssize_t) size;
-                break;
-            }
-
-        /* H5Tget_create_plist */
-        case H5VL_DATATYPE_GET_TCPL:
-            {
-                hid_t *ret_id = va_arg(arguments, hid_t *);
-
-                if(H5I_INVALID_HID == (*ret_id = H5T__get_create_plist(dt)))
-                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "can't get object creation info");
-
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't get this type of information from datatype")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_datatype_get() */
-
-
-/*-------------------------------------------------------------------------
- * Function:    H5VL__native_datatype_specific
- *
- * Purpose:     Specific operations for datatype
- *
- * Return:      SUCCEED/FAIL
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_datatype_specific(void *obj, H5VL_datatype_specific_t specific_type, 
-                             hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
-{
-    H5T_t       *dt = (H5T_t *)obj;
-    herr_t       ret_value = SUCCEED;    /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    switch(specific_type) {
-        case H5VL_DATATYPE_FLUSH:
-            {
-                hid_t type_id = va_arg(arguments, hid_t);
-
-                /* To flush metadata and invoke flush callback if there is */
-                if (H5O_flush_common(&dt->oloc, type_id) < 0)
-                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTFLUSH, FAIL, "unable to flush datatype")
-
-                break;
-            }
-
-        case H5VL_DATATYPE_REFRESH:
-            {
-                hid_t type_id = va_arg(arguments, hid_t);
-
-                /* Call private function to refresh datatype object */
-                if ((H5O_refresh_metadata(type_id, dt->oloc)) < 0)
-                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTLOAD, FAIL, "unable to refresh datatype")
-
-                break;
-            }
-
-        default:
-            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid specific operation")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_datatype_specific() */
-
-
-/*-------------------------------------------------------------------------
- * Function:	H5VL__native_datatype_close
- *
- * Purpose:	Closes a datatype.
- *
- * Return:	Success:	0
- *		Failure:	-1, datatype not closed.
- *
- * Programmer:  Mohamad Chaarawi
- *              March, 2012
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-H5VL__native_datatype_close(void *dt, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
-{
-    herr_t ret_value = SUCCEED;                 /* Return value */
-
-    FUNC_ENTER_STATIC
-
-    if(H5T_close((H5T_t*)dt) < 0)
-        HGOTO_ERROR(H5E_SYM, H5E_CANTDEC, FAIL, "can't close datatype")
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__native_datatype_close() */
-
diff --git a/src/H5VLnative.h b/src/H5VLnative.h
index 8ae3a66..1a3007a 100644
--- a/src/H5VLnative.h
+++ b/src/H5VLnative.h
@@ -25,14 +25,70 @@
 #define H5VL_NATIVE_VALUE       H5_VOL_NATIVE   /* enum value */
 #define H5VL_NATIVE_VERSION     0
 
+/* Typedef and values for native VOL connector attribute optional VOL operations */
+typedef int H5VL_native_attr_optional_t;
+#ifndef H5_NO_DEPRECATED_SYMBOLS
+#define H5VL_NATIVE_ATTR_ITERATE_OLD    0   /* H5Aiterate (deprecated routine) */
+#endif /* H5_NO_DEPRECATED_SYMBOLS */
+
+/* Typedef and values for native VOL connector dataset optional VOL operations */
+typedef int H5VL_native_dataset_optional_t;
+#define H5VL_NATIVE_DATASET_FORMAT_CONVERT          0   /* H5Dformat_convert (internal) */
+#define H5VL_NATIVE_DATASET_GET_CHUNK_INDEX_TYPE    1   /* H5Dget_chunk_index_type      */
+#define H5VL_NATIVE_DATASET_GET_CHUNK_STORAGE_SIZE  2   /* H5Dget_chunk_storage_size    */
+#define H5VL_NATIVE_DATASET_CHUNK_READ              3   /* H5Dchunk_read                */
+#define H5VL_NATIVE_DATASET_CHUNK_WRITE             4   /* H5Dchunk_write               */
+
+/* Typedef and values for native VOL connector file optional VOL operations */
+typedef int H5VL_native_file_optional_t;
+#define H5VL_NATIVE_FILE_CLEAR_ELINK_CACHE              0   /* H5Fclear_elink_file_cache            */
+#define H5VL_NATIVE_FILE_GET_FILE_IMAGE                 1   /* H5Fget_file_image                    */
+#define H5VL_NATIVE_FILE_GET_FREE_SECTIONS              2   /* H5Fget_free_sections                 */
+#define H5VL_NATIVE_FILE_GET_FREE_SPACE                 3   /* H5Fget_freespace                     */
+#define H5VL_NATIVE_FILE_GET_INFO                       4   /* H5Fget_info1/2                       */
+#define H5VL_NATIVE_FILE_GET_MDC_CONF                   5   /* H5Fget_mdc_config                    */
+#define H5VL_NATIVE_FILE_GET_MDC_HR                     6   /* H5Fget_mdc_hit_rate                  */
+#define H5VL_NATIVE_FILE_GET_MDC_SIZE                   7   /* H5Fget_mdc_size                      */
+#define H5VL_NATIVE_FILE_GET_SIZE                       8   /* H5Fget_filesize                      */
+#define H5VL_NATIVE_FILE_GET_VFD_HANDLE                 9   /* H5Fget_vfd_handle                    */
+#define H5VL_NATIVE_FILE_GET_FILE_ID                    10  /* H5Fget_file_id                       */
+#define H5VL_NATIVE_FILE_RESET_MDC_HIT_RATE             11  /* H5Freset_mdc_hit_rate_stats          */
+#define H5VL_NATIVE_FILE_SET_MDC_CONFIG                 12  /* H5Fset_mdc_config                    */
+#define H5VL_NATIVE_FILE_GET_METADATA_READ_RETRY_INFO   13  /* H5Fget_metadata_read_retry_info      */
+#define H5VL_NATIVE_FILE_START_SWMR_WRITE               14  /* H5Fstart_swmr_write                  */
+#define H5VL_NATIVE_FILE_START_MDC_LOGGING              15  /* H5Fstart_mdc_logging                 */
+#define H5VL_NATIVE_FILE_STOP_MDC_LOGGING               16  /* H5Fstop_mdc_logging                  */
+#define H5VL_NATIVE_FILE_GET_MDC_LOGGING_STATUS         17  /* H5Fget_mdc_logging_status            */
+#define H5VL_NATIVE_FILE_FORMAT_CONVERT                 18  /* H5Fformat_convert                    */
+#define H5VL_NATIVE_FILE_RESET_PAGE_BUFFERING_STATS     19  /* H5Freset_page_buffering_stats        */
+#define H5VL_NATIVE_FILE_GET_PAGE_BUFFERING_STATS       20  /* H5Fget_page_buffering_stats          */
+#define H5VL_NATIVE_FILE_GET_MDC_IMAGE_INFO             21  /* H5Fget_mdc_image_info                */
+#define H5VL_NATIVE_FILE_GET_EOA                        22  /* H5Fget_eoa                           */
+#define H5VL_NATIVE_FILE_INCR_FILESIZE                  23  /* H5Fincrement_filesize                */
+#define H5VL_NATIVE_FILE_SET_LIBVER_BOUNDS              24  /* H5Fset_latest_format/libver_bounds   */
+#define H5VL_NATIVE_FILE_GET_MIN_DSET_OHDR_FLAG         25  /* H5Fget_dset_no_attrs_hint            */
+#define H5VL_NATIVE_FILE_SET_MIN_DSET_OHDR_FLAG         26  /* H5Fset_dset_no_attrs_hint            */
+
+/* Typedef and values for native VOL connector group optional VOL operations */
+typedef int H5VL_native_group_optional_t;
+#ifndef H5_NO_DEPRECATED_SYMBOLS
+#define H5VL_NATIVE_GROUP_ITERATE_OLD   0   /* HG5Giterate (deprecated routine) */
+#define H5VL_NATIVE_GROUP_GET_OBJINFO   1   /* HG5Gget_objinfo (deprecated routine) */
+#endif /* H5_NO_DEPRECATED_SYMBOLS */
+
+/* Typedef and values for native VOL connector object optional VOL operations */
+typedef int H5VL_native_object_optional_t;
+#define H5VL_NATIVE_OBJECT_GET_COMMENT      0   /* H5G|H5Oget_comment, H5Oget_comment_by_name   */
+#define H5VL_NATIVE_OBJECT_GET_INFO         1   /* H5Oget_info(_by_idx, _by_name)(2)            */
+#define H5VL_NATIVE_OBJECT_SET_COMMENT      2   /* H5G|H5Oset_comment, H5Oset_comment_by_name   */
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+/* Private functions */
 H5_DLL hid_t H5VL_native_register(void);
 
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/H5VLnative_attr.c b/src/H5VLnative_attr.c
new file mode 100644
index 0000000..7d9f0ac
--- /dev/null
+++ b/src/H5VLnative_attr.c
@@ -0,0 +1,597 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Purpose:     Attribute callbacks for the native VOL connector
+ *
+ */
+
+#define H5A_FRIEND              /* Suppress error about including H5Apkg    */
+
+#include "H5private.h"          /* Generic Functions                        */
+#include "H5Apkg.h"             /* Attributes                               */
+#include "H5Eprivate.h"         /* Error handling                           */
+#include "H5Fprivate.h"         /* Files                                    */
+#include "H5Gprivate.h"         /* Groups                                   */
+#include "H5Iprivate.h"         /* IDs                                      */
+#include "H5Pprivate.h"         /* Property lists                           */
+#include "H5Sprivate.h"         /* Dataspaces                               */
+#include "H5Tprivate.h"         /* Datatypes                                */
+#include "H5VLprivate.h"        /* Virtual Object Layer                     */
+
+#include "H5VLnative_private.h" /* Native VOL connector                     */
+
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_attr_create
+ *
+ * Purpose:     Handles the attribute create callback
+ *
+ * Return:      Success:    attribute pointer
+ *              Failure:    NULL
+ *
+ *-------------------------------------------------------------------------
+ */
+void *
+H5VL__native_attr_create(void *obj, const H5VL_loc_params_t *loc_params, const char *attr_name,
+    hid_t acpl_id, hid_t H5_ATTR_UNUSED aapl_id, hid_t H5_ATTR_UNUSED dxpl_id,
+    void H5_ATTR_UNUSED **req)
+{
+    H5G_loc_t       loc;                /* Object location */
+    H5G_loc_t       obj_loc;            /* Location used to open group */
+    hbool_t         loc_found = FALSE;  
+    H5P_genplist_t  *plist;             /* Property list pointer */
+    hid_t           type_id, space_id;
+    H5T_t           *type, *dt;         /* Datatype to use for attribute */
+    H5S_t           *space;             /* Dataspace to use for attribute */
+    H5A_t           *attr = NULL;
+    void            *ret_value = NULL;
+
+    FUNC_ENTER_PACKAGE
+
+    /* Get the plist structure */
+    if(NULL == (plist = (H5P_genplist_t *)H5I_object(acpl_id)))
+        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, NULL, "can't find object for ID")
+
+    /* get creation properties */
+    if(H5P_get(plist, H5VL_PROP_ATTR_TYPE_ID, &type_id) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get property value for datatype id")
+    if(H5P_get(plist, H5VL_PROP_ATTR_SPACE_ID, &space_id) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get property value for space id")
+
+    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
+    if(0 == (H5F_INTENT(loc.oloc->file) & H5F_ACC_RDWR))
+        HGOTO_ERROR(H5E_ARGS, H5E_WRITEERROR, NULL, "no write intent on file")
+
+    if(NULL == (dt = (H5T_t *)H5I_object_verify(type_id, H5I_DATATYPE)))
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a datatype")
+    /* If this is a named datatype, get the connector's pointer to the datatype */
+    type = H5T_get_actual_type(dt);
+
+    if(NULL == (space = (H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a data space")
+
+    if(loc_params->type == H5VL_OBJECT_BY_SELF) {
+        /* H5Acreate */
+        /* Go do the real work for attaching the attribute to the dataset */
+        if(NULL == (attr = H5A__create(&loc, attr_name, type, space, acpl_id)))
+            HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, NULL, "unable to create attribute")
+    } /* end if */
+    else if(loc_params->type == H5VL_OBJECT_BY_NAME) {
+        /* H5Acreate_by_name */
+        if(NULL == (attr = H5A__create_by_name(&loc, loc_params->loc_data.loc_by_name.name, attr_name, type, space, acpl_id)))
+            HGOTO_ERROR(H5E_ATTR, H5E_CANTINIT, NULL, "unable to create attribute")
+    } /* end else-if */
+    else
+        HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, NULL, "unknown attribute create parameters")
+
+    ret_value = (void *)attr;
+
+done:
+    /* Release resources */
+    if(loc_found && H5G_loc_free(&obj_loc) < 0)
+        HDONE_ERROR(H5E_ATTR, H5E_CANTRELEASE, NULL, "can't free location") 
+
+   FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_attr_create() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_attr_open
+ *
+ * Purpose:     Handles the attribute open callback
+ *
+ * Return:      Success:    attribute pointer
+ *              Failure:    NULL
+ *
+ *-------------------------------------------------------------------------
+ */
+void *
+H5VL__native_attr_open(void *obj, const H5VL_loc_params_t *loc_params, const char *attr_name, 
+    hid_t H5_ATTR_UNUSED aapl_id, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
+{
+    H5G_loc_t    loc;             /* Object location */
+    H5A_t        *attr = NULL;    /* Attribute opened */
+    void         *ret_value;
+
+    FUNC_ENTER_PACKAGE
+
+    /* check arguments */
+    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
+
+    if(loc_params->type == H5VL_OBJECT_BY_SELF) {
+        /* H5Aopen */
+        /* Open the attribute */
+        if(NULL == (attr = H5A__open(&loc, attr_name)))
+            HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, NULL, "unable to open attribute: '%s'", attr_name)
+    } /* end if */
+    else if(loc_params->type == H5VL_OBJECT_BY_NAME) {
+        /* H5Aopen_by_name */
+        /* Open the attribute on the object header */
+        if(NULL == (attr = H5A__open_by_name(&loc, loc_params->loc_data.loc_by_name.name, attr_name)))
+            HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, NULL, "can't open attribute")
+    } /* end else-if */
+    else if(loc_params->type == H5VL_OBJECT_BY_IDX) {
+        /* H5Aopen_by_idx */
+        /* Open the attribute in the object header */
+        if(NULL == (attr = H5A__open_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, 
+                                           loc_params->loc_data.loc_by_idx.idx_type, 
+                                           loc_params->loc_data.loc_by_idx.order, 
+                                           loc_params->loc_data.loc_by_idx.n)))
+            HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, NULL, "unable to open attribute")
+    } /* end else-if */
+    else
+        HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, NULL, "unknown attribute open parameters")
+
+    ret_value = (void *)attr;
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_attr_open() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_attr_read
+ *
+ * Purpose:     Handles the attribute read callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_attr_read(void *attr, hid_t dtype_id, void *buf,
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
+{
+    H5T_t *mem_type;            /* Memory datatype */
+    herr_t ret_value;           /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    if(NULL == (mem_type = (H5T_t *)H5I_object_verify(dtype_id, H5I_DATATYPE)))
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
+
+    /* Go write the actual data to the attribute */
+    if((ret_value = H5A__read((H5A_t*)attr, mem_type, buf)) < 0)
+        HGOTO_ERROR(H5E_ATTR, H5E_READERROR, FAIL, "unable to read attribute")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_attr_read() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_attr_write
+ *
+ * Purpose:     Handles the attribute write callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_attr_write(void *attr, hid_t dtype_id, const void *buf,
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
+{
+    H5T_t *mem_type;            /* Memory datatype */
+    herr_t ret_value;           /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    if(NULL == (mem_type = (H5T_t *)H5I_object_verify(dtype_id, H5I_DATATYPE)))
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype")
+
+    /* Go write the actual data to the attribute */
+    if((ret_value = H5A__write((H5A_t*)attr, mem_type, buf)) < 0)
+        HGOTO_ERROR(H5E_ATTR, H5E_WRITEERROR, FAIL, "unable to write attribute")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_attr_write() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_attr_get
+ *
+ * Purpose:     Handles the attribute get callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_attr_get(void *obj, H5VL_attr_get_t get_type,
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    herr_t      ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    switch(get_type) {
+        /* H5Aget_space */
+        case H5VL_ATTR_GET_SPACE:
+            {
+                hid_t   *ret_id = HDva_arg(arguments, hid_t *);
+                H5A_t   *attr = (H5A_t *)obj;
+
+                if((*ret_id = H5A_get_space(attr)) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get space ID of attribute")
+                break;
+            }
+
+        /* H5Aget_type */
+        case H5VL_ATTR_GET_TYPE:
+            {
+                hid_t   *ret_id = HDva_arg(arguments, hid_t *);
+                H5A_t   *attr = (H5A_t *)obj;
+
+                if((*ret_id = H5A__get_type(attr)) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get datatype ID of attribute")
+                break;
+            }
+
+        /* H5Aget_create_plist */
+        case H5VL_ATTR_GET_ACPL:
+            {
+                hid_t   *ret_id = HDva_arg(arguments, hid_t *);
+                H5A_t   *attr = (H5A_t *)obj;
+
+                if((*ret_id = H5A__get_create_plist(attr)) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get creation property list for attr")
+
+                break;
+            }
+
+        /* H5Aget_name */
+        case H5VL_ATTR_GET_NAME:
+            {
+                const H5VL_loc_params_t *loc_params = HDva_arg(arguments, const H5VL_loc_params_t *);
+                size_t  buf_size = HDva_arg(arguments, size_t);
+                char    *buf = HDva_arg(arguments, char *);
+                ssize_t *ret_val = HDva_arg(arguments, ssize_t *);
+                H5A_t   *attr = NULL;
+
+                if(H5VL_OBJECT_BY_SELF == loc_params->type) {
+                    attr = (H5A_t *)obj;
+                    /* Call private function in turn */
+                    if(0 > (*ret_val = H5A__get_name(attr, buf_size, buf)))
+                        HGOTO_ERROR(H5E_ATTR, H5E_CANTGET, FAIL, "can't get attribute name")
+                }
+                else if(H5VL_OBJECT_BY_IDX == loc_params->type) {
+                    H5G_loc_t loc;
+                    
+                    /* check arguments */
+                    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+                        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+                    /* Open the attribute on the object header */
+                    if(NULL == (attr = H5A__open_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, 
+                                                       loc_params->loc_data.loc_by_idx.idx_type, 
+                                                       loc_params->loc_data.loc_by_idx.order, 
+                                                       loc_params->loc_data.loc_by_idx.n)))
+                        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "can't open attribute")
+
+                    /* Get the length of the name */
+                    *ret_val = (ssize_t)HDstrlen(attr->shared->name);
+
+                    /* Copy the name into the user's buffer, if given */
+                    if(buf) {
+                        HDstrncpy(buf, attr->shared->name, MIN((size_t)(*ret_val + 1), buf_size));
+                        if((size_t)(*ret_val) >= buf_size)
+                            buf[buf_size - 1]='\0';
+                    } /* end if */
+
+                    /* Release resources */
+                    if(attr && H5A__close(attr) < 0)
+                        HGOTO_ERROR(H5E_ATTR, H5E_CANTFREE, FAIL, "can't close attribute")
+                }
+                else
+                    HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't get name of attr")
+
+                break;
+            }
+
+        /* H5Aget_info */
+        case H5VL_ATTR_GET_INFO:
+            {
+                const H5VL_loc_params_t *loc_params = HDva_arg(arguments, const H5VL_loc_params_t *);
+                H5A_info_t   *ainfo = HDva_arg(arguments, H5A_info_t *);
+                H5A_t   *attr = NULL;
+
+                if(H5VL_OBJECT_BY_SELF == loc_params->type) {
+                    attr = (H5A_t *)obj;
+                    if(H5A__get_info(attr, ainfo) < 0)
+                        HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get attribute info")
+                }
+                else if(H5VL_OBJECT_BY_NAME == loc_params->type) {
+                    char *attr_name = HDva_arg(arguments, char *);
+                    H5G_loc_t loc;
+                    
+                    /* check arguments */
+                    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+                        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+                    /* Open the attribute on the object header */
+                    if(NULL == (attr = H5A__open_by_name(&loc, loc_params->loc_data.loc_by_name.name, attr_name)))
+                        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "can't open attribute")
+
+                    /* Get the attribute information */
+                    if(H5A__get_info(attr, ainfo) < 0)
+                        HGOTO_ERROR(H5E_ATTR, H5E_CANTGET, FAIL, "unable to get attribute info")
+
+                    /* Release resources */
+                    if(attr && H5A__close(attr) < 0)
+                        HGOTO_ERROR(H5E_ATTR, H5E_CANTFREE, FAIL, "can't close attribute")
+                }
+                else if(H5VL_OBJECT_BY_IDX == loc_params->type) {
+                    H5G_loc_t loc;
+                    
+                    /* check arguments */
+                    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+                        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+                    /* Open the attribute on the object header */
+                    if(NULL == (attr = H5A__open_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, 
+                                                       loc_params->loc_data.loc_by_idx.idx_type, 
+                                                       loc_params->loc_data.loc_by_idx.order, 
+                                                       loc_params->loc_data.loc_by_idx.n)))
+                        HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "can't open attribute")
+
+                    /* Get the attribute information */
+                    if(H5A__get_info(attr, ainfo) < 0)
+                        HGOTO_ERROR(H5E_ATTR, H5E_CANTGET, FAIL, "unable to get attribute info")
+
+                    /* Release resources */
+                    if(attr && H5A__close(attr) < 0)
+                        HGOTO_ERROR(H5E_ATTR, H5E_CANTFREE, FAIL, "can't close attribute")
+                }
+                else
+                    HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't get name of attr")
+
+                break;
+            }
+
+        case H5VL_ATTR_GET_STORAGE_SIZE:
+            {
+                hsize_t *ret = HDva_arg(arguments, hsize_t *);
+                H5A_t   *attr = (H5A_t *)obj;
+
+                /* Set return value */
+                *ret = attr->shared->data_size;
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't get this type of information from attr")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_attr_get() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_attr_specific
+ *
+ * Purpose:     Handles the attribute specific callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_attr_specific(void *obj, const H5VL_loc_params_t *loc_params, H5VL_attr_specific_t specific_type, 
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    H5G_loc_t   loc;
+    herr_t      ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    /* Get location for passed-in object */
+    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+    switch(specific_type) {
+        case H5VL_ATTR_DELETE:
+            {
+                char    *attr_name = HDva_arg(arguments, char *);
+
+                if(H5VL_OBJECT_BY_SELF == loc_params->type) {
+                    /* H5Adelete */
+                    /* Delete the attribute from the location */
+                    if(H5O__attr_remove(loc.oloc, attr_name) < 0)
+                        HGOTO_ERROR(H5E_ATTR, H5E_CANTDELETE, FAIL, "unable to delete attribute")
+                } /* end if */
+                else if(H5VL_OBJECT_BY_NAME == loc_params->type) {
+                    /* H5Adelete_by_name */
+                    /* Delete the attribute */
+                    if(H5A__delete_by_name(&loc, loc_params->loc_data.loc_by_name.name, attr_name) < 0)
+                        HGOTO_ERROR(H5E_ATTR, H5E_CANTDELETE, FAIL, "unable to delete attribute")
+                } /* end else-if */
+                else if(H5VL_OBJECT_BY_IDX == loc_params->type) {
+                    /* H5Adelete_by_idx */
+                    /* Delete the attribute from the location */
+                    if(H5A__delete_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, loc_params->loc_data.loc_by_idx.idx_type,
+                            loc_params->loc_data.loc_by_idx.order, loc_params->loc_data.loc_by_idx.n) < 0)
+                        HGOTO_ERROR(H5E_ATTR, H5E_CANTDELETE, FAIL, "unable to delete attribute")
+                } /* end else-if */
+                else
+                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown attribute remove parameters")
+                break;
+            }
+
+        case H5VL_ATTR_EXISTS:
+            {
+                const char *attr_name = HDva_arg(arguments, const char *);
+                htri_t  *ret = HDva_arg(arguments, htri_t *);
+
+                if(loc_params->type == H5VL_OBJECT_BY_SELF) { /* H5Aexists */
+                    /* Check if the attribute exists */
+                    if((*ret = H5O__attr_exists(loc.oloc, attr_name)) < 0)
+                        HGOTO_ERROR(H5E_ATTR, H5E_CANTGET, FAIL, "unable to determine if attribute exists")
+                } /* end if */
+                else if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Aexists_by_name */
+                    /* Check if the attribute exists */
+                    if((*ret = H5A__exists_by_name(loc, loc_params->loc_data.loc_by_name.name, attr_name)) < 0)
+                        HGOTO_ERROR(H5E_ATTR, H5E_CANTGET, FAIL, "unable to determine if attribute exists")
+                } /* end else-if */
+                else
+                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown parameters")
+                break;
+            }
+
+        case H5VL_ATTR_ITER:
+            {
+                H5_index_t          idx_type    = (H5_index_t)HDva_arg(arguments, int); /* enum work-around */
+                H5_iter_order_t     order       = (H5_iter_order_t)HDva_arg(arguments, int); /* enum work-around */
+                hsize_t            *idx         = HDva_arg(arguments, hsize_t *);
+                H5A_operator2_t     op          = HDva_arg(arguments, H5A_operator2_t);
+                void               *op_data     = HDva_arg(arguments, void *);
+
+                if(loc_params->type == H5VL_OBJECT_BY_SELF) { /* H5Aiterate2 */
+                    /* Iterate over attributes */
+                    if((ret_value = H5A__iterate(&loc, ".", idx_type, order, idx, op, op_data)) < 0)
+                        HGOTO_ERROR(H5E_ATTR, H5E_BADITER, FAIL, "error iterating over attributes")
+                } /* end if */
+                else if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Aiterate_by_name */
+                    /* Iterate over attributes by name */
+                    if((ret_value = H5A__iterate(&loc, loc_params->loc_data.loc_by_name.name, idx_type, order, idx, op, op_data)) < 0)
+                        HGOTO_ERROR(H5E_ATTR, H5E_BADITER, FAIL, "attribute iteration failed");
+                } /* end else-if */
+                else
+                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown parameters")
+                break;
+            }
+
+        /* H5Arename/rename_by_name */
+        case H5VL_ATTR_RENAME:
+            {
+                const char *old_name  = HDva_arg(arguments, const char *);
+                const char *new_name  = HDva_arg(arguments, const char *);
+
+                if(loc_params->type == H5VL_OBJECT_BY_SELF) { /* H5Arename */
+                    /* Call attribute rename routine */
+                    if(H5O__attr_rename(loc.oloc, old_name, new_name) < 0)
+                        HGOTO_ERROR(H5E_ATTR, H5E_CANTRENAME, FAIL, "can't rename attribute")
+                } /* end if */
+                else if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Arename_by_name */
+                    /* Call attribute rename routine */
+                    if(H5A__rename_by_name(loc, loc_params->loc_data.loc_by_name.name, old_name, new_name) < 0)
+                        HGOTO_ERROR(H5E_ATTR, H5E_CANTRENAME, FAIL, "can't rename attribute")
+                } /* end else-if */
+                else
+                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown attribute rename parameters")
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid specific operation")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_attr_specific() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_attr_optional
+ *
+ * Purpose:     Handles the attribute optional callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_attr_optional(void H5_ATTR_UNUSED *obj, hid_t H5_ATTR_UNUSED dxpl_id,
+    void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    H5VL_native_attr_optional_t optional_type;
+    herr_t ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    optional_type = HDva_arg(arguments, H5VL_native_attr_optional_t);
+    switch(optional_type) {
+#ifndef H5_NO_DEPRECATED_SYMBOLS
+        case H5VL_NATIVE_ATTR_ITERATE_OLD:
+            {
+                hid_t loc_id = HDva_arg(arguments, hid_t);
+                unsigned *attr_num = HDva_arg(arguments, unsigned *);
+                H5A_operator1_t op = HDva_arg(arguments, H5A_operator1_t);
+                void *op_data = HDva_arg(arguments, void *);
+
+                /* Call the actual iteration routine */
+                if((ret_value = H5A__iterate_old(loc_id, attr_num, op, op_data)) < 0)
+                    HERROR(H5E_VOL, H5E_BADITER, "error iterating over attributes");
+
+                break;
+            }
+#endif /* H5_NO_DEPRECATED_SYMBOLS */
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid optional operation")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_attr_optional() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_attr_close
+ *
+ * Purpose:     Handles the attribute close callback
+ *
+ * Return:      Success:    SUCCEED
+ *              Failure:    FAIL (attribute will not be closed)
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_attr_close(void *attr, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
+{
+    herr_t ret_value = SUCCEED;                 /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    if(H5A__close((H5A_t*)attr) < 0)
+        HGOTO_ERROR(H5E_SYM, H5E_CANTDEC, FAIL, "can't close attribute")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_attr_close() */
+
diff --git a/src/H5VLnative_dataset.c b/src/H5VLnative_dataset.c
new file mode 100644
index 0000000..8f7351c
--- /dev/null
+++ b/src/H5VLnative_dataset.c
@@ -0,0 +1,575 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Purpose:     Dataset callbacks for the native VOL connector
+ *
+ */
+
+#define H5D_FRIEND              /* Suppress error about including H5Dpkg    */
+
+#include "H5private.h"          /* Generic Functions                        */
+#include "H5Dpkg.h"             /* Datasets                                 */
+#include "H5Eprivate.h"         /* Error handling                           */
+#include "H5Fprivate.h"         /* Files                                    */
+#include "H5Gprivate.h"         /* Groups                                   */
+#include "H5Iprivate.h"         /* IDs                                      */
+#include "H5Pprivate.h"         /* Property lists                           */
+#include "H5Sprivate.h"         /* Dataspaces                               */
+#include "H5VLprivate.h"        /* Virtual Object Layer                     */
+
+#include "H5VLnative_private.h" /* Native VOL connector                     */
+
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_dataset_create
+ *
+ * Purpose:     Handles the dataset create callback
+ *
+ * Return:      Success:    dataset pointer
+ *              Failure:    NULL
+ *
+ *-------------------------------------------------------------------------
+ */
+void *
+H5VL__native_dataset_create(void *obj, const H5VL_loc_params_t *loc_params,
+    const char *name, hid_t dcpl_id, hid_t dapl_id, hid_t H5_ATTR_UNUSED dxpl_id,
+    void H5_ATTR_UNUSED **req)
+{
+    H5P_genplist_t *plist;              /* Property list pointer */
+    H5G_loc_t       loc;                 /* Object location to insert dataset into */
+    hid_t           type_id = H5I_INVALID_HID;
+    hid_t           space_id = H5I_INVALID_HID;
+    hid_t           lcpl_id = H5I_INVALID_HID;
+    H5D_t          *dset = NULL;        /* New dataset's info */
+    const H5S_t    *space;              /* Dataspace for dataset */
+    void           *ret_value;
+
+    FUNC_ENTER_PACKAGE
+
+    /* Get the plist structure */
+    if(NULL == (plist = (H5P_genplist_t *)H5I_object(dcpl_id)))
+        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, NULL, "can't find object for ID")
+
+    /* Get creation properties */
+    if(H5P_get(plist, H5VL_PROP_DSET_TYPE_ID, &type_id) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get property value for datatype id")
+    if(H5P_get(plist, H5VL_PROP_DSET_SPACE_ID, &space_id) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get property value for space id")
+    if(H5P_get(plist, H5VL_PROP_DSET_LCPL_ID, &lcpl_id) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get property value for lcpl id")
+
+    /* Check arguments */
+    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
+    if(H5I_DATATYPE != H5I_get_type(type_id))
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a datatype ID")
+    if(NULL == (space = (const H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE)))
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a dataspace ID")
+
+    /* H5Dcreate_anon */
+    if(NULL == name) {
+        /* build and open the new dataset */
+        if(NULL == (dset = H5D__create(loc.oloc->file, type_id, space, dcpl_id, dapl_id)))
+            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to create dataset")
+    } /* end if */
+    /* H5Dcreate2 */
+    else {
+        /* Create the new dataset & get its ID */
+        if(NULL == (dset = H5D__create_named(&loc, name, type_id, space, lcpl_id, dcpl_id, dapl_id)))
+            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to create dataset")
+    } /* end else */
+
+    ret_value = (void *)dset;
+
+done:
+    if(NULL == name) {
+        /* Release the dataset's object header, if it was created */
+        if(dset) {
+            H5O_loc_t *oloc;         /* Object location for dataset */
+
+            /* Get the new dataset's object location */
+            if(NULL == (oloc = H5D_oloc(dset)))
+                HDONE_ERROR(H5E_DATASET, H5E_CANTGET, NULL, "unable to get object location of dataset")
+
+            /* Decrement refcount on dataset's object header in memory */
+            if(H5O_dec_rc_by_loc(oloc) < 0)
+                HDONE_ERROR(H5E_DATASET, H5E_CANTDEC, NULL, "unable to decrement refcount on newly created object")
+        } /* end if */
+    } /* end if */
+
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_dataset_create() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_dataset_open
+ *
+ * Purpose:     Handles the dataset open callback
+ *
+ * Return:      Success:    dataset pointer
+ *              Failure:    NULL
+ *
+ *-------------------------------------------------------------------------
+ */
+void *
+H5VL__native_dataset_open(void *obj, const H5VL_loc_params_t *loc_params, const char *name, 
+    hid_t dapl_id, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
+{
+    H5D_t       *dset = NULL;
+    H5G_loc_t   loc;                /* Object location of group */
+    void         *ret_value = NULL;
+
+    FUNC_ENTER_PACKAGE
+
+    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
+
+    /* Open the dataset */
+    if(NULL == (dset = H5D__open_name(&loc, name, dapl_id)))
+        HGOTO_ERROR(H5E_DATASET, H5E_CANTOPENOBJ, NULL, "unable to open dataset")
+
+    ret_value = (void *)dset;
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_dataset_open() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_dataset_read
+ *
+ * Purpose:     Handles the dataset read callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_dataset_read(void *obj, hid_t mem_type_id, hid_t mem_space_id,
+    hid_t file_space_id, hid_t H5_ATTR_UNUSED dxpl_id, void *buf,
+    void H5_ATTR_UNUSED **req)
+{
+    H5D_t         *dset = (H5D_t *)obj;
+    const H5S_t   *mem_space = NULL;
+    const H5S_t   *file_space = NULL;
+    herr_t         ret_value = SUCCEED;                 /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    /* Check arguments */
+    if(NULL == dset->oloc.file)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "dataset is not associated with a file")
+
+    /* Get validated dataspace pointers */
+    if(H5S_get_validated_dataspace(mem_space_id, &mem_space) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "could not get a validated dataspace from mem_space_id")
+    if(H5S_get_validated_dataspace(file_space_id, &file_space) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "could not get a validated dataspace from file_space_id")
+
+    /* Read raw data */
+    if(H5D__read(dset, mem_type_id, mem_space, file_space, buf/*out*/) < 0)
+        HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "can't read data")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_dataset_read() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_dataset_write
+ *
+ * Purpose:     Handles the dataset write callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_dataset_write(void *obj, hid_t mem_type_id, hid_t mem_space_id,
+    hid_t file_space_id, hid_t H5_ATTR_UNUSED dxpl_id, const void *buf,
+    void H5_ATTR_UNUSED **req)
+{
+    H5D_t           *dset = (H5D_t *)obj;
+    const H5S_t     *mem_space = NULL;
+    const H5S_t     *file_space = NULL;
+    herr_t           ret_value = SUCCEED;        /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    /* check arguments */
+    if(NULL == dset->oloc.file)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "dataset is not associated with a file")
+
+    /* Get validated dataspace pointers */
+    if(H5S_get_validated_dataspace(mem_space_id, &mem_space) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "could not get a validated dataspace from mem_space_id")
+    if(H5S_get_validated_dataspace(file_space_id, &file_space) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "could not get a validated dataspace from file_space_id")
+
+    /* Write the data */
+    if(H5D__write(dset, mem_type_id, mem_space, file_space, buf) < 0) 
+        HGOTO_ERROR(H5E_DATASET, H5E_WRITEERROR, FAIL, "can't write data")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_dataset_write() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_dataset_get
+ *
+ * Purpose:     Handles the dataset get callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_dataset_get(void *obj, H5VL_dataset_get_t get_type,
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    H5D_t       *dset = (H5D_t *)obj;
+    herr_t       ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    switch(get_type) {
+        /* H5Dget_space */
+        case H5VL_DATASET_GET_SPACE:
+            {
+                hid_t   *ret_id = HDva_arg(arguments, hid_t *);
+
+                if((*ret_id = H5D__get_space(dset)) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get space ID of dataset")
+
+                break;
+            }
+
+        /* H5Dget_space_statuc */
+        case H5VL_DATASET_GET_SPACE_STATUS:
+            {
+                H5D_space_status_t *allocation = HDva_arg(arguments, H5D_space_status_t *);
+
+                /* Read data space address and return */
+                if(H5D__get_space_status(dset, allocation) < 0)
+                    HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to get space status")
+
+                break;
+            }
+
+        /* H5Dget_type */
+        case H5VL_DATASET_GET_TYPE:
+            {
+                hid_t   *ret_id = HDva_arg(arguments, hid_t *);
+
+                if((*ret_id = H5D__get_type(dset)) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get datatype ID of dataset")
+
+                break;
+            }
+
+        /* H5Dget_create_plist */
+        case H5VL_DATASET_GET_DCPL:
+            {
+                hid_t   *ret_id = HDva_arg(arguments, hid_t *);
+
+                if((*ret_id = H5D_get_create_plist(dset)) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get creation property list for dataset")
+
+                break;
+            }
+
+        /* H5Dget_access_plist */
+        case H5VL_DATASET_GET_DAPL:
+            {
+                hid_t   *ret_id = HDva_arg(arguments, hid_t *);
+
+                if((*ret_id = H5D_get_access_plist(dset)) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get access property list for dataset")
+
+                break;
+            }
+
+        /* H5Dget_storage_size */
+        case H5VL_DATASET_GET_STORAGE_SIZE:
+            {
+                hsize_t *ret = HDva_arg(arguments, hsize_t *);
+
+                /* Set return value */
+                if(H5D__get_storage_size(dset, ret) < 0)
+                    HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get size of dataset's storage")
+                break;
+            }
+
+        /* H5Dget_offset */
+        case H5VL_DATASET_GET_OFFSET:
+            {
+                haddr_t *ret = HDva_arg(arguments, haddr_t *);
+
+                /* Set return value */
+                *ret = H5D__get_offset(dset);
+                if(!H5F_addr_defined(*ret))
+                    *ret = HADDR_UNDEF;
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't get this type of information from dataset")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_dataset_get() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_dataset_specific
+ *
+ * Purpose:     Handles the dataset specific callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_dataset_specific(void *obj, H5VL_dataset_specific_t specific_type, 
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    H5D_t       *dset = (H5D_t *)obj;
+    herr_t       ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    switch(specific_type) {
+        /* H5Dspecific_space */
+        case H5VL_DATASET_SET_EXTENT:
+            {
+                const hsize_t *size = HDva_arg(arguments, const hsize_t *); 
+
+                if(H5D__set_extent(dset, size) < 0)
+                    HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to set extent of dataset")
+                break;
+            }
+
+        case H5VL_DATASET_FLUSH:
+            {
+                hid_t dset_id = HDva_arg(arguments, hid_t);
+
+                /* Flush the dataset */
+                if(H5D__flush(dset, dset_id) < 0)
+                    HGOTO_ERROR(H5E_DATASET, H5E_CANTFLUSH, FAIL, "unable to flush dataset")
+
+                break;
+            }
+
+        case H5VL_DATASET_REFRESH:
+            {
+                hid_t dset_id = HDva_arg(arguments, hid_t);
+
+                /* Refresh the dataset */
+                if((H5D__refresh(dset_id, dset)) < 0)
+                    HGOTO_ERROR(H5E_DATASET, H5E_CANTLOAD, FAIL, "unable to refresh dataset")
+
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid specific operation")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_dataset_specific() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_dataset_optional
+ *
+ * Purpose:     Handles the dataset optional callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_dataset_optional(void *obj, hid_t H5_ATTR_UNUSED dxpl_id,
+    void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    H5D_t *dset = NULL;             /* Dataset */
+    H5VL_native_dataset_optional_t optional_type = HDva_arg(arguments, H5VL_native_dataset_optional_t);
+    herr_t ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    switch(optional_type) {
+        case H5VL_NATIVE_DATASET_FORMAT_CONVERT:
+            {
+                dset = (H5D_t *)obj;
+
+                switch(dset->shared->layout.type) {
+                    case H5D_CHUNKED:
+                        /* Convert the chunk indexing type to version 1 B-tree if not */
+                        if(dset->shared->layout.u.chunk.idx_type != H5D_CHUNK_IDX_BTREE)
+                            if((H5D__format_convert(dset)) < 0)
+                                HGOTO_ERROR(H5E_DATASET, H5E_CANTLOAD, FAIL, "unable to downgrade chunk indexing type for dataset")
+                        break;
+
+                    case H5D_CONTIGUOUS:
+                    case H5D_COMPACT:
+                        /* Downgrade the layout version to 3 if greater than 3 */
+                        if(dset->shared->layout.version > H5O_LAYOUT_VERSION_DEFAULT)
+                            if((H5D__format_convert(dset)) < 0)
+                                HGOTO_ERROR(H5E_DATASET, H5E_CANTLOAD, FAIL, "unable to downgrade layout version for dataset")
+                        break;
+
+                    case H5D_VIRTUAL:
+                        /* Nothing to do even though layout is version 4 */
+                        break;
+
+                    case H5D_LAYOUT_ERROR:
+                    case H5D_NLAYOUTS:
+                        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid dataset layout type")
+
+                    default: 
+                        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "unknown dataset layout type")
+                } /* end switch */
+
+                break;
+            }
+
+        case H5VL_NATIVE_DATASET_GET_CHUNK_INDEX_TYPE:
+            {
+                H5D_chunk_index_t *idx_type = HDva_arg(arguments, H5D_chunk_index_t *);
+
+                dset = (H5D_t *)obj;
+
+                /* Make sure the dataset is chunked */
+                if(H5D_CHUNKED != dset->shared->layout.type)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a chunked dataset")
+
+                /* Get the chunk indexing type */
+                *idx_type = dset->shared->layout.u.chunk.idx_type;
+
+                break;
+            }
+
+        case H5VL_NATIVE_DATASET_GET_CHUNK_STORAGE_SIZE:
+            {
+                hsize_t *offset = HDva_arg(arguments, hsize_t *);
+                hsize_t *chunk_nbytes = HDva_arg(arguments, hsize_t *);
+
+                dset = (H5D_t *)obj;
+
+                /* Make sure the dataset is chunked */
+                if(H5D_CHUNKED != dset->shared->layout.type)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a chunked dataset")
+
+                /* Call private function */
+                if(H5D__get_chunk_storage_size(dset, offset, chunk_nbytes) < 0)
+                    HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get storage size of chunk")
+
+                break;
+            }
+
+        case H5VL_NATIVE_DATASET_CHUNK_READ:
+            {
+                const       hsize_t *offset     = HDva_arg(arguments, hsize_t *);
+                uint32_t   *filters             = HDva_arg(arguments, uint32_t *);
+                void       *buf                 = HDva_arg(arguments, void *);
+                hsize_t     offset_copy[H5O_LAYOUT_NDIMS];  /* Internal copy of chunk offset */
+
+                dset = (H5D_t *)obj;
+
+                /* Check arguments */
+                if(NULL == dset->oloc.file)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "dataset is not associated with a file")
+                if(H5D_CHUNKED != dset->shared->layout.type)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a chunked dataset")
+
+                /* Copy the user's offset array so we can be sure it's terminated properly.
+                 * (we don't want to mess with the user's buffer).
+                 */
+                if(H5D__get_offset_copy(dset, offset, offset_copy) < 0)
+                    HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "failure to copy offset array")
+
+                /* Read the raw chunk */
+                if(H5D__chunk_direct_read(dset, offset_copy, filters, buf) < 0)
+                    HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "can't read unprocessed chunk data")
+
+                break;
+            }
+
+        case H5VL_NATIVE_DATASET_CHUNK_WRITE:
+            {
+                uint32_t        filters             = HDva_arg(arguments, uint32_t);
+                const  hsize_t *offset              = HDva_arg(arguments, const hsize_t *);
+                uint32_t        data_size_32        = HDva_arg(arguments, uint32_t);
+                const void     *buf                 = HDva_arg(arguments, const void *);
+                hsize_t         offset_copy[H5O_LAYOUT_NDIMS];  /* Internal copy of chunk offset */
+
+                dset = (H5D_t *)obj;
+
+                /* Check arguments */
+                if(NULL == dset->oloc.file)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "dataset is not associated with a file")
+                if(H5D_CHUNKED != dset->shared->layout.type)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a chunked dataset")
+
+                /* Copy the user's offset array so we can be sure it's terminated properly.
+                 * (we don't want to mess with the user's buffer).
+                 */
+                if(H5D__get_offset_copy(dset, offset, offset_copy) < 0)
+                    HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "failure to copy offset array")
+
+                /* Write chunk */
+                if(H5D__chunk_direct_write(dset, filters, offset_copy, data_size_32, buf) < 0)
+                    HGOTO_ERROR(H5E_DATASET, H5E_WRITEERROR, FAIL, "can't write unprocessed chunk data")
+
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid optional operation")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_dataset_optional() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_dataset_close
+ *
+ * Purpose:     Handles the dataset close callback
+ *
+ * Return:      Success:    SUCCEED
+ *              Failure:    FAIL (dataset will not be closed)
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_dataset_close(void *dset, hid_t H5_ATTR_UNUSED dxpl_id,
+    void H5_ATTR_UNUSED **req)
+{
+    herr_t ret_value = SUCCEED;                 /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    if(H5D_close((H5D_t*)dset) < 0)
+        HGOTO_ERROR(H5E_DATASET, H5E_CANTDEC, FAIL, "can't close dataset")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_dataset_close() */
+
diff --git a/src/H5VLnative_datatype.c b/src/H5VLnative_datatype.c
new file mode 100644
index 0000000..3c9463d
--- /dev/null
+++ b/src/H5VLnative_datatype.c
@@ -0,0 +1,265 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Purpose:     Datatype callbacks for the native VOL connector
+ *
+ */
+
+#define H5T_FRIEND              /* Suppress error about including H5Tpkg    */
+
+#include "H5private.h"          /* Generic Functions                        */
+#include "H5Eprivate.h"         /* Error handling                           */
+#include "H5Gprivate.h"         /* Groups                                   */
+#include "H5Iprivate.h"         /* IDs                                      */
+#include "H5Oprivate.h"         /* Object headers                           */
+#include "H5Pprivate.h"         /* Property lists                           */
+#include "H5Tpkg.h"             /* Datatypes                                */
+#include "H5VLprivate.h"        /* Virtual Object Layer                     */
+
+#include "H5VLnative_private.h" /* Native VOL connector                     */
+
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_datatype_commit
+ *
+ * Purpose:     Handles the datatype commit callback
+ *
+ * Return:      Success:    datatype pointer
+ *              Failure:    NULL
+ *
+ *-------------------------------------------------------------------------
+ */
+void *
+H5VL__native_datatype_commit(void *obj, const H5VL_loc_params_t *loc_params, const char *name,
+    hid_t type_id, hid_t lcpl_id, hid_t tcpl_id, hid_t H5_ATTR_UNUSED tapl_id,
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
+{
+    H5G_loc_t   loc;                    /* Location to commit datatype */
+    H5T_t       *dt;                    /* Datatype for ID */
+    H5T_t       *type = NULL;           /* copy of the original type which will be committed */
+    void        *ret_value = NULL;      /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    /* check arguments */
+    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
+
+    if(NULL == (dt = (H5T_t *)H5I_object_verify(type_id, H5I_DATATYPE)))
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a datatype")
+
+    /* Check arguments.  We cannot commit an immutable type because H5Tclose()
+     * normally fails on such types (try H5Tclose(H5T_NATIVE_INT)) but closing
+     * a named type should always succeed.
+     */
+    if(H5T_STATE_NAMED == dt->shared->state || H5T_STATE_OPEN == dt->shared->state)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "datatype is already committed")
+    if(H5T_STATE_IMMUTABLE == dt->shared->state)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "datatype is immutable")
+
+    /* Check for a "sensible" datatype to store on disk */
+    if(H5T_is_sensible(dt) <= 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "datatype is not sensible")
+
+    /* Copy the datatype - the copied one will be the type that is
+     * committed, and attached to original datatype above the VOL
+     * layer
+     */
+    if(NULL == (type = H5T_copy(dt, H5T_COPY_TRANSIENT)))
+        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "unable to copy");
+
+    /* Commit the datatype */
+    if(NULL != name) {
+        /* H5Tcommit */
+        if(H5T__commit_named(&loc, name, type, lcpl_id, tcpl_id) < 0)
+            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "unable to commit datatype")
+    } /* end if */
+    else {
+        /* H5Tcommit_anon */
+        if(H5T__commit_anon(loc.oloc->file, type, tcpl_id) < 0)
+            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "unable to commit datatype")
+    } /* end else */
+
+    ret_value = (void *)type;
+
+done:
+    if(NULL == ret_value && type)
+        H5T_close(type);
+
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_datatype_commit() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_datatype_open
+ *
+ * Purpose:     Handles the datatype open callback
+ *
+ * Return:      Success:    datatype pointer
+ *              Failure:    NULL
+ *
+ *-------------------------------------------------------------------------
+ */
+void *
+H5VL__native_datatype_open(void *obj, const H5VL_loc_params_t *loc_params, const char *name, 
+    hid_t H5_ATTR_UNUSED tapl_id, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
+{
+    H5T_t       *type = NULL;           /* Datatype opened in file */
+    H5G_loc_t    loc;                   /* Group location of object to open */
+    void        *ret_value = NULL;
+
+    FUNC_ENTER_PACKAGE
+
+    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
+
+    /* Open the datatype */
+    if(NULL == (type = H5T__open_name(&loc, name)))
+        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTOPENOBJ, NULL, "unable to open named datatype")
+
+    type->vol_obj = NULL;
+
+    ret_value = (void *)type;
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_datatype_open() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_datatype_get
+ *
+ * Purpose:     Handles the datatype get callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_datatype_get(void *obj, H5VL_datatype_get_t get_type, 
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    H5T_t       *dt = (H5T_t *)obj;
+    herr_t       ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    switch (get_type) {
+        case H5VL_DATATYPE_GET_BINARY:
+            {
+                ssize_t *nalloc = HDva_arg(arguments, ssize_t *);
+                void *buf = HDva_arg(arguments, void *);
+                size_t size = HDva_arg(arguments, size_t);
+
+                if(H5T_encode(dt, (unsigned char *)buf, &size) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "can't determine serialized length of datatype")
+
+                *nalloc = (ssize_t) size;
+                break;
+            }
+
+        /* H5Tget_create_plist */
+        case H5VL_DATATYPE_GET_TCPL:
+            {
+                hid_t *ret_id = HDva_arg(arguments, hid_t *);
+
+                if(H5I_INVALID_HID == (*ret_id = H5T__get_create_plist(dt)))
+                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTGET, FAIL, "can't get object creation info");
+
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't get this type of information from datatype")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_datatype_get() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_datatype_specific
+ *
+ * Purpose:     Handles the datatype specific callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_datatype_specific(void *obj, H5VL_datatype_specific_t specific_type, 
+                             hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    H5T_t       *dt = (H5T_t *)obj;
+    herr_t       ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    switch(specific_type) {
+        case H5VL_DATATYPE_FLUSH:
+            {
+                hid_t type_id = HDva_arg(arguments, hid_t);
+
+                /* To flush metadata and invoke flush callback if there is */
+                if(H5O_flush_common(&dt->oloc, type_id) < 0)
+                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTFLUSH, FAIL, "unable to flush datatype")
+
+                break;
+            }
+
+        case H5VL_DATATYPE_REFRESH:
+            {
+                hid_t type_id = HDva_arg(arguments, hid_t);
+
+                /* Call private function to refresh datatype object */
+                if((H5O_refresh_metadata(type_id, dt->oloc)) < 0)
+                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTLOAD, FAIL, "unable to refresh datatype")
+
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid specific operation")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_datatype_specific() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_datatype_close
+ *
+ * Purpose:     Handles the datatype close callback
+ *
+ * Return:      Success:    SUCCEED
+ *              Failure:    FAIL (datatype will not be closed)
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_datatype_close(void *dt, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
+{
+    herr_t ret_value = SUCCEED;                 /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    if(H5T_close((H5T_t*)dt) < 0)
+        HGOTO_ERROR(H5E_SYM, H5E_CANTDEC, FAIL, "can't close datatype")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_datatype_close() */
+
diff --git a/src/H5VLnative_file.c b/src/H5VLnative_file.c
new file mode 100644
index 0000000..e7f27e1
--- /dev/null
+++ b/src/H5VLnative_file.c
@@ -0,0 +1,830 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Purpose:     File callbacks for the native VOL connector
+ *
+ */
+
+#define H5F_FRIEND              /* Suppress error about including H5Fpkg    */
+
+#include "H5private.h"          /* Generic Functions                        */
+#include "H5ACprivate.h"        /* Metadata cache                           */
+#include "H5Cprivate.h"         /* Cache                                    */
+#include "H5Eprivate.h"         /* Error handling                           */
+#include "H5Fpkg.h"             /* Files                                    */
+#include "H5Gprivate.h"         /* Groups                                   */
+#include "H5Iprivate.h"         /* IDs                                      */
+#include "H5MFprivate.h"        /* File memory management                   */
+#include "H5Pprivate.h"         /* Property lists                           */
+#include "H5PBprivate.h"        /* Page buffering                           */
+#include "H5VLprivate.h"        /* Virtual Object Layer                     */
+
+#include "H5VLnative_private.h" /* Native VOL connector                     */
+
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_file_create
+ *
+ * Purpose:     Handles the file create callback
+ *
+ * Return:      Success:    file pointer
+ *              Failure:    NULL
+ *
+ *-------------------------------------------------------------------------
+ */
+void *
+H5VL__native_file_create(const char *name, unsigned flags, hid_t fcpl_id, hid_t fapl_id, 
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
+{
+    H5F_t *new_file = NULL;
+    void  *ret_value = NULL;
+
+    FUNC_ENTER_PACKAGE
+
+    /* Adjust bit flags by turning on the creation bit and making sure that
+     * the EXCL or TRUNC bit is set.  All newly-created files are opened for
+     * reading and writing.
+     */
+    if(0 == (flags & (H5F_ACC_EXCL|H5F_ACC_TRUNC)))
+        flags |= H5F_ACC_EXCL;              /* default */
+    flags |= H5F_ACC_RDWR | H5F_ACC_CREAT;
+
+    /* Create the file */ 
+    if(NULL == (new_file = H5F_open(name, flags, fcpl_id, fapl_id)))
+        HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to create file")
+    new_file->id_exists = TRUE;
+
+    ret_value = (void *)new_file;
+
+done:
+    if(NULL == ret_value && new_file) 
+        if(H5F__close(new_file) < 0)
+            HDONE_ERROR(H5E_FILE, H5E_CANTCLOSEFILE, NULL, "problems closing file")
+
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_file_create() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_file_open
+ *
+ * Purpose:     Handles the file open callback
+ *
+ * Return:      Success:    file pointer
+ *              Failure:    NULL
+ *
+ *-------------------------------------------------------------------------
+ */
+void *
+H5VL__native_file_open(const char *name, unsigned flags, hid_t fapl_id,
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
+{
+    H5F_t *new_file = NULL;
+    void  *ret_value = NULL;
+
+    FUNC_ENTER_PACKAGE
+
+    /* Open the file */ 
+    if(NULL == (new_file = H5F_open(name, flags, H5P_FILE_CREATE_DEFAULT, fapl_id)))
+        HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to open file")
+    new_file->id_exists = TRUE;
+
+    ret_value = (void *)new_file;
+
+done:
+    if(NULL == ret_value && new_file && H5F_try_close(new_file, NULL) < 0)
+        HDONE_ERROR(H5E_FILE, H5E_CANTCLOSEFILE, NULL, "problems closing file")
+
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_file_open() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_file_get
+ *
+ * Purpose:     Handles the file get callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_file_get(void *obj, H5VL_file_get_t get_type,
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    H5F_t       *f = NULL;              /* File struct */
+    herr_t      ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    switch(get_type) {
+        /* H5Fget_access_plist */
+        case H5VL_FILE_GET_FAPL:
+            {
+                H5P_genplist_t *new_plist;              /* New property list */
+                hid_t          *plist_id = HDva_arg(arguments, hid_t *);
+
+                f = (H5F_t *)obj;
+
+                /* Retrieve the file's access property list */
+                if((*plist_id = H5F_get_access_plist(f, TRUE)) < 0)
+                    HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get file access property list")
+
+                if(NULL == (new_plist = (H5P_genplist_t *)H5I_object(*plist_id)))
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list")
+                break;
+            }
+
+        /* H5Fget_create_plist */
+        case H5VL_FILE_GET_FCPL:
+            {
+                H5P_genplist_t *plist;      /* Property list */
+                hid_t          *plist_id = HDva_arg(arguments, hid_t *);
+
+                f = (H5F_t *)obj;
+                if(NULL == (plist = (H5P_genplist_t *)H5I_object(f->shared->fcpl_id)))
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list")
+
+                /* Create the property list object to return */
+                if((*plist_id = H5P_copy_plist(plist, TRUE)) < 0)
+                    HGOTO_ERROR(H5E_PLIST, H5E_CANTINIT, FAIL, "unable to copy file creation properties")
+
+                break;
+            }
+
+        /* H5Fget_obj_count */
+        case H5VL_FILE_GET_OBJ_COUNT:
+            {
+                unsigned    types = HDva_arg(arguments, unsigned);
+                ssize_t    *ret = HDva_arg(arguments, ssize_t *);
+                size_t      obj_count = 0;      /* Number of opened objects */
+
+                f = (H5F_t *)obj;
+                /* Perform the query */
+                if(H5F_get_obj_count(f, types, TRUE, &obj_count) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_BADITER, FAIL, "H5F_get_obj_count failed")
+
+                /* Set the return value */
+                *ret = (ssize_t)obj_count;
+                break;
+            }
+
+        /* H5Fget_obj_ids */
+        case H5VL_FILE_GET_OBJ_IDS:
+            {
+                unsigned    types = HDva_arg(arguments, unsigned);
+                size_t      max_objs = HDva_arg(arguments, size_t);
+                hid_t      *oid_list = HDva_arg(arguments, hid_t *);
+                ssize_t    *ret = HDva_arg(arguments, ssize_t *);
+                size_t      obj_count = 0;      /* Number of opened objects */
+
+                f = (H5F_t *)obj;
+                /* Perform the query */
+                if(H5F_get_obj_ids(f, types, max_objs, oid_list, TRUE, &obj_count) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_BADITER, FAIL, "H5F_get_obj_ids failed")
+
+                /* Set the return value */
+                *ret = (ssize_t)obj_count;
+                break;
+            }
+
+        /* H5Fget_intent */
+        case H5VL_FILE_GET_INTENT:
+            {
+                unsigned *intent_flags = HDva_arg(arguments, unsigned *);
+
+                f = (H5F_t *)obj;
+
+                /* HDF5 uses some flags internally that users don't know about.
+                 * Simplify things for them so that they only get either H5F_ACC_RDWR
+                 * or H5F_ACC_RDONLY and any SWMR flags.
+                 */
+                if(H5F_INTENT(f) & H5F_ACC_RDWR) {
+                    *intent_flags = H5F_ACC_RDWR;
+
+                    /* Check for SWMR write access on the file */
+                    if(H5F_INTENT(f) & H5F_ACC_SWMR_WRITE)
+                        *intent_flags |= H5F_ACC_SWMR_WRITE;
+                } /* end if */
+                else {
+                    *intent_flags = H5F_ACC_RDONLY;
+
+                    /* Check for SWMR read access on the file */
+                    if(H5F_INTENT(f) & H5F_ACC_SWMR_READ)
+                        *intent_flags |= H5F_ACC_SWMR_READ;
+                } /* end else */
+
+                break;
+            }
+
+        /* H5Fget_name */
+        case H5VL_FILE_GET_NAME:
+            {
+                H5I_type_t  type = (H5I_type_t)HDva_arg(arguments, int); /* enum work-around */
+                size_t      size = HDva_arg(arguments, size_t);
+                char       *name = HDva_arg(arguments, char *);
+                ssize_t    *ret  = HDva_arg(arguments, ssize_t *);
+                size_t      len;
+
+                if(NULL == (f = H5F__get_file(obj, type)))
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+                len = HDstrlen(H5F_OPEN_NAME(f));
+
+                if(name) {
+                    HDstrncpy(name, H5F_OPEN_NAME(f), MIN(len + 1,size));
+                    if(len >= size)
+                        name[size-1]='\0';
+                } /* end if */
+
+                /* Set the return value for the API call */
+                *ret = (ssize_t)len;
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't get this type of information")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_file_get() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_file_specific
+ *
+ * Purpose:     Handles the file specific callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_file_specific(void *obj, H5VL_file_specific_t specific_type,
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    herr_t       ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    switch(specific_type) {
+        /* H5Fflush */
+        case H5VL_FILE_FLUSH:
+            {
+                H5I_type_t      type = (H5I_type_t)HDva_arg(arguments, int); /* enum work-around */
+                H5F_scope_t     scope = (H5F_scope_t)HDva_arg(arguments, int); /* enum work-around */
+                H5F_t           *f = NULL;              /* File to flush */
+
+                /* Get the file for the object */
+                if(NULL == (f = H5F__get_file(obj, type)))
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+                /* Nothing to do if the file is read only. This determination is
+                 * made at the shared open(2) flags level, implying that opening a
+                 * file twice, once for read-only and once for read-write, and then
+                 * calling H5Fflush() with the read-only handle, still causes data
+                 * to be flushed.
+                 */
+                 if(H5F_ACC_RDWR & H5F_INTENT(f)) {
+                     /* Flush other files, depending on scope */
+                     if(H5F_SCOPE_GLOBAL == scope) {
+                         /* Call the flush routine for mounted file hierarchies */
+                         if(H5F_flush_mounts(f) < 0)
+                             HGOTO_ERROR(H5E_FILE, H5E_CANTFLUSH, FAIL, "unable to flush mounted file hierarchy")
+                     } /* end if */
+                     else {
+                         /* Call the flush routine, for this file */
+                         if(H5F__flush(f) < 0)
+                             HGOTO_ERROR(H5E_FILE, H5E_CANTFLUSH, FAIL, "unable to flush file's cached information")
+                     } /* end else */
+                 } /* end if */
+                break;
+            }
+
+        /* H5Freopen */
+        case H5VL_FILE_REOPEN:
+            {
+                void   **ret        = HDva_arg(arguments, void **);
+                H5F_t  *new_file    = NULL;
+
+                /* Reopen the file through the VOL connector */
+                if(NULL == (new_file = H5F__reopen((H5F_t *)obj)))
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, FAIL, "unable to reopen file")
+                new_file->id_exists = TRUE;
+
+                *ret = (void *)new_file;
+                break;
+            }
+
+        /* H5Fmount */
+        case H5VL_FILE_MOUNT:
+            {
+                H5I_type_t  type       = (H5I_type_t)HDva_arg(arguments, int); /* enum work-around */
+                const char *name       = HDva_arg(arguments, const char *);
+                H5F_t      *child      = HDva_arg(arguments, H5F_t *);
+                hid_t       plist_id   = HDva_arg(arguments, hid_t);
+                H5G_loc_t   loc;
+
+                if(H5G_loc_real(obj, type, &loc) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+                /* Do the mount */
+                if(H5F__mount(&loc, name, child, plist_id) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_MOUNT, FAIL, "unable to mount file")
+
+                break;
+            }
+
+        /* H5Funmount */
+        case H5VL_FILE_UNMOUNT:
+            {
+                H5I_type_t  type       = (H5I_type_t)HDva_arg(arguments, int); /* enum work-around */
+                const char *name       = HDva_arg(arguments, const char *);
+                H5G_loc_t   loc;
+
+                if(H5G_loc_real(obj, type, &loc) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+                /* Unmount */
+                if(H5F__unmount(&loc, name) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_MOUNT, FAIL, "unable to unmount file")
+
+                break;
+            }
+
+        /* H5Fis_accessible */
+        case H5VL_FILE_IS_ACCESSIBLE:
+            {
+                hid_t       fapl_id = HDva_arg(arguments, hid_t);
+                const char *name    = HDva_arg(arguments, const char *);
+                htri_t     *ret     = HDva_arg(arguments, htri_t *);
+
+                /* Call private routine */
+                if((*ret = H5F__is_hdf5(name, fapl_id)) < 0)
+                    HGOTO_ERROR(H5E_IO, H5E_CANTINIT, FAIL, "error in HDF5 file check")
+                break;
+            }
+
+
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid specific operation")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_file_specific() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_file_optional
+ *
+ * Purpose:     Handles the file optional callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_file_optional(void *obj, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    H5F_t *f = NULL;           /* File */
+    H5VL_native_file_optional_t optional_type = HDva_arg(arguments, H5VL_native_file_optional_t);
+    herr_t ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    f = (H5F_t *)obj;
+    switch(optional_type) {
+        /* H5Fget_filesize */
+        case H5VL_NATIVE_FILE_GET_SIZE:
+            {
+                haddr_t     max_eof_eoa;            /* Maximum of the EOA & EOF */
+                haddr_t     base_addr;              /* Base address for the file */
+                hsize_t    *size = HDva_arg(arguments, hsize_t *);
+
+                /* Go get the actual file size */
+                if(H5F__get_max_eof_eoa(f, &max_eof_eoa) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "file can't get max eof/eoa ")
+
+                base_addr = H5FD_get_base_addr(f->shared->lf);
+
+                if(size)
+                    *size = (hsize_t)(max_eof_eoa + base_addr);     /* Convert relative base address for file to absolute address */
+
+                break;
+            }
+
+        /* H5Fget_file_image */
+        case H5VL_NATIVE_FILE_GET_FILE_IMAGE:
+            {
+                void       *buf_ptr   = HDva_arg(arguments, void *);
+                ssize_t    *ret       = HDva_arg(arguments, ssize_t *);
+                size_t      buf_len   = HDva_arg(arguments, size_t );
+
+                /* Do the actual work */
+                if((*ret = H5F__get_file_image(f, buf_ptr, buf_len)) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "get file image failed")
+                break;
+            }
+
+        /* H5Fget_freespace */
+        case H5VL_NATIVE_FILE_GET_FREE_SPACE:
+            {
+                hsize_t     tot_space;  /* Amount of free space in the file */
+                hssize_t    *ret = HDva_arg(arguments, hssize_t *);
+
+                /* Go get the actual amount of free space in the file */
+                if(H5MF_get_freespace(f, &tot_space, NULL) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to check free space for file")
+                *ret = (hssize_t)tot_space;
+                break;
+            }
+
+        /* H5Fget_free_sections */
+        case H5VL_NATIVE_FILE_GET_FREE_SECTIONS:
+            {
+                H5F_sect_info_t *sect_info = HDva_arg(arguments, H5F_sect_info_t *);
+                ssize_t         *ret       = HDva_arg(arguments, ssize_t *);
+                H5F_mem_t       type       = (H5F_mem_t)HDva_arg(arguments, int); /* enum work-around */
+                size_t          nsects     = HDva_arg(arguments, size_t);
+
+                /* Go get the free-space section information in the file */
+                if((*ret = H5MF_get_free_sections(f, type, nsects, sect_info)) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to check free space for file")
+                break;
+            }
+
+        /* H5Fget_info1/2 */
+        case H5VL_NATIVE_FILE_GET_INFO:
+            {
+                H5I_type_t  type   = (H5I_type_t)HDva_arg(arguments, int); /* enum work-around */
+                H5F_info2_t *finfo = HDva_arg(arguments, H5F_info2_t *);
+
+                /* Get the file struct. This call is careful to not return the file pointer
+                 * for the top file in a mount hierarchy.
+                 */
+                if(NULL == (f = H5F__get_file(obj, type)))
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "could not get a file struct")
+
+                /* Get the file info */
+                if(H5F__get_info(f, finfo) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to retrieve file info")
+
+                break;
+            }
+
+        /* H5Fget_mdc_config */
+        case H5VL_NATIVE_FILE_GET_MDC_CONF:
+            {
+                H5AC_cache_config_t *config_ptr = HDva_arg(arguments, H5AC_cache_config_t *);
+
+                /* Go get the resize configuration */
+                if(H5AC_get_cache_auto_resize_config(f->shared->cache, config_ptr) < 0)
+                    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "H5AC_get_cache_auto_resize_config() failed.")
+                break;
+            }
+
+        /* H5Fget_mdc_hit_rate */
+        case H5VL_NATIVE_FILE_GET_MDC_HR:
+            {
+                double *hit_rate_ptr = HDva_arg(arguments, double *);
+
+                /* Go get the current hit rate */
+                if(H5AC_get_cache_hit_rate(f->shared->cache, hit_rate_ptr) < 0)
+                    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "H5AC_get_cache_hit_rate() failed.")
+                break;
+            }
+
+        /* H5Fget_mdc_size */
+        case H5VL_NATIVE_FILE_GET_MDC_SIZE:
+            {
+                size_t *max_size_ptr        = HDva_arg(arguments, size_t *);
+                size_t *min_clean_size_ptr  = HDva_arg(arguments, size_t *);
+                size_t *cur_size_ptr        = HDva_arg(arguments, size_t *); 
+                int    *cur_num_entries_ptr = HDva_arg(arguments, int *); 
+                uint32_t cur_num_entries;
+
+                /* Go get the size data */
+                if(H5AC_get_cache_size(f->shared->cache, max_size_ptr, min_clean_size_ptr, 
+                                       cur_size_ptr, &cur_num_entries) < 0)
+                    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "H5AC_get_cache_size() failed.")
+
+                if(cur_num_entries_ptr != NULL)
+                    *cur_num_entries_ptr = (int)cur_num_entries;
+                break;
+            }
+
+        /* H5Fget_vfd_handle */
+        case H5VL_NATIVE_FILE_GET_VFD_HANDLE:
+            {
+                void **file_handle  = HDva_arg(arguments, void **);
+                hid_t  fapl_id      = HDva_arg(arguments, hid_t);
+
+                /* Retrieve the VFD handle for the file */
+                if(H5F_get_vfd_handle(f, fapl_id, file_handle) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't retrieve VFD handle")
+                break;
+            }
+
+        /* H5Iget_file_id */
+        case H5VL_NATIVE_FILE_GET_FILE_ID:
+            {
+                H5I_type_t  type = (H5I_type_t)HDva_arg(arguments, int); /* enum work-around */
+                hid_t      *file_id = HDva_arg(arguments, hid_t *);
+
+                if(NULL == (f = H5F__get_file(obj, type)))
+                    HGOTO_ERROR(H5E_FILE, H5E_BADTYPE, FAIL, "not a file or file object")
+                if((*file_id = H5F__get_file_id(f)) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't get file ID")
+                break;
+            }
+
+        /* H5Fclear_elink_file_cache */
+        case H5VL_NATIVE_FILE_CLEAR_ELINK_CACHE:
+            {
+                /* Release the EFC */
+                if(f->shared->efc)
+                    if(H5F__efc_release(f->shared->efc) < 0)
+                        HGOTO_ERROR(H5E_FILE, H5E_CANTRELEASE, FAIL, "can't release external file cache")
+                break;
+            }
+
+        /* H5Freset_mdc_hit_rate_stats */
+        case H5VL_NATIVE_FILE_RESET_MDC_HIT_RATE:
+            {
+                /* Reset the hit rate statistic */
+                if(H5AC_reset_cache_hit_rate_stats(f->shared->cache) < 0)
+                    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "can't reset cache hit rate")
+                break;
+            }
+
+        /* H5Fset_mdc_config */
+        case H5VL_NATIVE_FILE_SET_MDC_CONFIG:
+            {
+                H5AC_cache_config_t *config_ptr = HDva_arg(arguments, H5AC_cache_config_t *);
+
+                /* set the resize configuration  */
+                if(H5AC_set_cache_auto_resize_config(f->shared->cache, config_ptr) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "H5AC_set_cache_auto_resize_config() failed")
+                break;
+            }
+
+        /* H5Fget_metadata_read_retry_info */
+        case H5VL_NATIVE_FILE_GET_METADATA_READ_RETRY_INFO:
+            {
+                H5F_retry_info_t *info = HDva_arg(arguments, H5F_retry_info_t *);
+
+                if(H5F_get_metadata_read_retry_info(f, info) < 0)
+                    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "can't get metadata read retry info")
+
+                break;
+            }
+
+        /* H5Fstart_swmr_write */
+        case H5VL_NATIVE_FILE_START_SWMR_WRITE:
+            {
+                if(H5F__start_swmr_write(f) < 0)
+                    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "can't start SWMR write")
+
+                break;
+            }
+
+        /* H5Fstart_mdc_logging */
+        case H5VL_NATIVE_FILE_START_MDC_LOGGING:
+            {
+                /* Call mdc logging function */
+                if(H5C_start_logging(f->shared->cache) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_LOGGING, FAIL, "unable to start mdc logging")
+
+                break;
+            }
+
+        /* H5Fstop_mdc_logging */
+        case H5VL_NATIVE_FILE_STOP_MDC_LOGGING:
+            {
+                /* Call mdc logging function */
+                if(H5C_stop_logging(f->shared->cache) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_LOGGING, FAIL, "unable to stop mdc logging")
+
+                break;
+            }
+
+        /* H5Fget_mdc_logging_status */
+        case H5VL_NATIVE_FILE_GET_MDC_LOGGING_STATUS:
+            {
+                hbool_t *is_enabled             = HDva_arg(arguments, hbool_t *);
+                hbool_t *is_currently_logging   = HDva_arg(arguments, hbool_t *);
+
+                /* Call mdc logging function */
+                if(H5C_get_logging_status(f->shared->cache, is_enabled, is_currently_logging) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_LOGGING, FAIL, "unable to get logging status")
+
+                break;
+            }
+
+        /* H5Fformat_convert */
+        case H5VL_NATIVE_FILE_FORMAT_CONVERT:
+            {
+                /* Convert the format */
+                if(H5F__format_convert(f) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTCONVERT, FAIL, "can't convert file format")
+
+                break;
+            }
+
+        /* H5Freset_page_buffering_stats */
+        case H5VL_NATIVE_FILE_RESET_PAGE_BUFFERING_STATS:
+            {
+                /* Sanity check */
+                if(NULL == f->shared->page_buf)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "page buffering not enabled on file")
+
+                /* Reset the statistics */
+                if(H5PB_reset_stats(f->shared->page_buf) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't reset stats for page buffering")
+
+                break;
+            }
+
+        /* H5Fget_page_buffering_stats */
+        case H5VL_NATIVE_FILE_GET_PAGE_BUFFERING_STATS:
+            {
+                unsigned *accesses      = HDva_arg(arguments, unsigned *);
+                unsigned *hits          = HDva_arg(arguments, unsigned *);
+                unsigned *misses        = HDva_arg(arguments, unsigned *);
+                unsigned *evictions     = HDva_arg(arguments, unsigned *);
+                unsigned *bypasses      = HDva_arg(arguments, unsigned *);
+                
+                /* Sanity check */
+                if(NULL == f->shared->page_buf)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "page buffering not enabled on file")
+
+                /* Get the statistics */
+                if(H5PB_get_stats(f->shared->page_buf, accesses, hits, misses, evictions, bypasses) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't retrieve stats for page buffering")
+
+                break;
+            }
+
+        /* H5Fget_mdc_image_info */
+        case H5VL_NATIVE_FILE_GET_MDC_IMAGE_INFO:
+            {
+                haddr_t *image_addr = HDva_arg(arguments, haddr_t *);
+                hsize_t *image_len = HDva_arg(arguments, hsize_t *);
+
+                /* Go get the address and size of the cache image */
+                if(H5AC_get_mdc_image_info(f->shared->cache, image_addr, image_len) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't retrieve cache image info")
+
+                break;
+            }
+
+        /* H5Fget_eoa */
+        case H5VL_NATIVE_FILE_GET_EOA:
+            {
+                haddr_t *eoa = HDva_arg(arguments, haddr_t *);
+                haddr_t rel_eoa;        /* Relative address of EOA */
+
+                /* Sanity check */
+                HDassert(eoa);
+
+                /* This routine will work only for drivers with this feature enabled.*/
+                /* We might introduce a new feature flag in the future */
+                if(!H5F_HAS_FEATURE(f, H5FD_FEAT_SUPPORTS_SWMR_IO))
+                    HGOTO_ERROR(H5E_FILE, H5E_BADVALUE, FAIL, "must use a SWMR-compatible VFD for this public routine")
+
+                /* The real work */
+                if(HADDR_UNDEF == (rel_eoa = H5F_get_eoa(f, H5FD_MEM_DEFAULT)))
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "get_eoa request failed")
+
+                /* Set return value */
+                /* (Note compensating for base address subtraction in internal routine) */
+                *eoa = rel_eoa + H5F_get_base_addr(f);
+
+                break;
+            }
+
+        /* H5Fincrement_filesize */
+        case H5VL_NATIVE_FILE_INCR_FILESIZE:
+            {
+                hsize_t increment = HDva_arg(arguments, hsize_t);
+                haddr_t max_eof_eoa;        /* Maximum of the relative EOA & EOF */
+
+                /* This public routine will work only for drivers with this feature enabled.*/
+                /* We might introduce a new feature flag in the future */
+                if(!H5F_HAS_FEATURE(f, H5FD_FEAT_SUPPORTS_SWMR_IO))
+                    HGOTO_ERROR(H5E_FILE, H5E_BADVALUE, FAIL, "must use a SWMR-compatible VFD for this public routine")
+
+                /* Get the maximum of EOA and EOF */
+                if(H5F__get_max_eof_eoa(f, &max_eof_eoa) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "file can't get max eof/eoa ")
+
+                /* Set EOA to the maximum value + increment */
+                if(H5F__set_eoa(f, H5FD_MEM_DEFAULT, max_eof_eoa + increment) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "driver set_eoa request failed")
+
+                break;
+            }
+
+        /* H5Fset_latest_format, H5Fset_libver_bounds */
+        case H5VL_NATIVE_FILE_SET_LIBVER_BOUNDS:
+            {
+                H5F_libver_t low = (H5F_libver_t)HDva_arg(arguments, int); /* enum work-around */
+                H5F_libver_t high = (H5F_libver_t)HDva_arg(arguments, int); /* enum work-around */
+
+                /* Call internal set_libver_bounds function */
+                if(H5F__set_libver_bounds(f, low, high) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "cannot set low/high bounds")
+
+                break;
+            }
+
+        /* H5Fget_dset_no_attrs_hint */
+        case H5VL_NATIVE_FILE_GET_MIN_DSET_OHDR_FLAG:
+            {
+                hbool_t *minimize = va_arg(arguments, hbool_t *);
+                *minimize = H5F_GET_MIN_DSET_OHDR(f);
+                break;
+            }
+
+        /* H5Fset_dset_no_attrs_hint */
+        case H5VL_NATIVE_FILE_SET_MIN_DSET_OHDR_FLAG:
+            {
+                int minimize = va_arg(arguments, int);
+                if(H5F_set_min_dset_ohdr(f, (hbool_t)minimize) < 0)
+                    HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "cannot set file's dataset object header minimization flag")
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid optional operation")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_file_optional() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_file_close
+ *
+ * Purpose:     Handles the file close callback
+ *
+ * Return:      Success:    SUCCEED
+ *              Failure:    FAIL (file will not be closed)
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_file_close(void *file, hid_t H5_ATTR_UNUSED dxpl_id,
+    void H5_ATTR_UNUSED **req)
+{
+    int     nref;
+    H5F_t   *f          = (H5F_t *)file;
+    hid_t   file_id     = H5I_INVALID_HID;
+    herr_t  ret_value   = SUCCEED;                  /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    /* This routine should only be called when a file ID's ref count drops to zero */
+    HDassert(H5F_ID_EXISTS(f));
+
+    /* Flush file if this is the last reference to this id and we have write
+     * intent, unless it will be flushed by the "shared" file being closed.
+     * This is only necessary to replicate previous behaviour, and could be
+     * disabled by an option/property to improve performance.
+     */
+    if((H5F_NREFS(f) > 1) && (H5F_INTENT(f) & H5F_ACC_RDWR)) {
+        /* Get the file ID corresponding to the H5F_t struct */
+        if(H5I_find_id(f, H5I_FILE, &file_id) < 0 || H5I_INVALID_HID == file_id)
+            HGOTO_ERROR(H5E_ATOM, H5E_CANTGET, FAIL, "invalid atom")
+
+        /* Get the number of references outstanding for this file ID */
+        if((nref = H5I_get_ref(file_id, FALSE)) < 0)
+            HGOTO_ERROR(H5E_ATOM, H5E_CANTGET, FAIL, "can't get ID ref count")
+        if(nref == 1)
+            if(H5F__flush(f) < 0)
+                HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "unable to flush cache")
+    } /* end if */
+
+    /* Close the file */
+    if(H5F__close(f) < 0)
+        HGOTO_ERROR(H5E_FILE, H5E_CANTDEC, FAIL, "can't close file")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_file_close() */
+
diff --git a/src/H5VLnative_group.c b/src/H5VLnative_group.c
new file mode 100644
index 0000000..9c07b3d
--- /dev/null
+++ b/src/H5VLnative_group.c
@@ -0,0 +1,363 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Purpose:     Group callbacks for the native VOL connector
+ *
+ */
+
+#define H5G_FRIEND              /* Suppress error about including H5Gpkg    */
+
+#include "H5private.h"          /* Generic Functions                        */
+#include "H5Eprivate.h"         /* Error handling                           */
+#include "H5Gpkg.h"             /* Groups                                   */
+#include "H5Iprivate.h"         /* IDs                                      */
+#include "H5Oprivate.h"         /* Object headers                           */
+#include "H5Pprivate.h"         /* Property lists                           */
+#include "H5VLprivate.h"        /* Virtual Object Layer                     */
+
+#include "H5VLnative_private.h" /* Native VOL connector                     */
+
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_group_create
+ *
+ * Purpose:     Handles the group create callback
+ *
+ * Return:      Success:    group pointer
+ *              Failure:    NULL
+ *
+ *-------------------------------------------------------------------------
+ */
+void *
+H5VL__native_group_create(void *obj, const H5VL_loc_params_t *loc_params, const char *name,
+    hid_t gcpl_id, hid_t H5_ATTR_UNUSED gapl_id, hid_t H5_ATTR_UNUSED dxpl_id,
+    void H5_ATTR_UNUSED **req)
+{
+    H5P_genplist_t *plist;              /* Property list pointer        */
+    H5G_loc_t       loc;                /* Location to create group     */
+    H5G_t          *grp = NULL;         /* New group created            */
+    hid_t           lcpl_id;
+    void           *ret_value;
+
+    FUNC_ENTER_PACKAGE
+
+    /* Get the property list structure */
+    if(NULL == (plist = (H5P_genplist_t *)H5I_object(gcpl_id)))
+        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, NULL, "can't find object for ID")
+
+    /* Get creation properties */
+    if(H5P_get(plist, H5VL_PROP_GRP_LCPL_ID, &lcpl_id) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get property value for lcpl id")
+
+    /* Set up the location */
+    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
+
+    /* if name is NULL then this is from H5Gcreate_anon */
+    if(name == NULL) {
+        H5G_obj_create_t gcrt_info;         /* Information for group creation */
+
+        /* Set up group creation info */
+        gcrt_info.gcpl_id = gcpl_id;
+        gcrt_info.cache_type = H5G_NOTHING_CACHED;
+        HDmemset(&gcrt_info.cache, 0, sizeof(gcrt_info.cache));
+
+        /* Create the new group & get its ID */
+        if(NULL == (grp = H5G__create(loc.oloc->file, &gcrt_info)))
+            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, NULL, "unable to create group")            
+    } /* end if */
+    /* otherwise it's from H5Gcreate */
+    else {
+        /* Create the new group & get its ID */
+        if(NULL == (grp = H5G__create_named(&loc, name, lcpl_id, gcpl_id)))
+            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, NULL, "unable to create group")
+    } /* end else */
+
+    ret_value = (void *)grp;
+
+done:
+    if(name == NULL) {
+        /* Release the group's object header, if it was created */
+        if(grp) {
+            H5O_loc_t *oloc;         /* Object location for group */
+
+            /* Get the new group's object location */
+            if(NULL == (oloc = H5G_oloc(grp)))
+                HDONE_ERROR(H5E_SYM, H5E_CANTGET, NULL, "unable to get object location of group")
+
+            /* Decrement refcount on group's object header in memory */
+            if(H5O_dec_rc_by_loc(oloc) < 0)
+                HDONE_ERROR(H5E_SYM, H5E_CANTDEC, NULL, "unable to decrement refcount on newly created object")
+         } /* end if */
+    } /* end if */
+
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_group_create() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_group_open
+ *
+ * Purpose:     Handles the group open callback
+ *
+ * Return:      Success:    group pointer
+ *              Failure:    NULL
+ *
+ *-------------------------------------------------------------------------
+ */
+void *
+H5VL__native_group_open(void *obj, const H5VL_loc_params_t *loc_params, const char *name, 
+    hid_t H5_ATTR_UNUSED gapl_id, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
+{
+    H5G_loc_t       loc;                /* Location to open group   */
+    H5G_t          *grp = NULL;         /* New group opend          */
+    void           *ret_value;
+
+    FUNC_ENTER_PACKAGE
+
+    /* Set up the location */
+    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
+
+    /* Open the group */
+    if((grp = H5G__open_name(&loc, name)) == NULL)
+        HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, NULL, "unable to open group")
+
+    ret_value = (void *)grp;
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_group_open() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_group_get
+ *
+ * Purpose:     Handles the group get callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_group_get(void *obj, H5VL_group_get_t get_type,
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    herr_t      ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    switch(get_type) {
+        /* H5Gget_create_plist */
+        case H5VL_GROUP_GET_GCPL:
+            {
+                hid_t      *new_gcpl_id     = HDva_arg(arguments, hid_t *);
+                H5G_t      *grp             = (H5G_t *)obj;
+
+                if((*new_gcpl_id = H5G_get_create_plist(grp)) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_CANTGET, FAIL, "can't get creation property list for group")
+                break;
+            }
+
+        /* H5Gget_info */
+        case H5VL_GROUP_GET_INFO:
+            {
+                const H5VL_loc_params_t  *loc_params  = HDva_arg(arguments, const H5VL_loc_params_t *);
+                H5G_info_t         *group_info  = HDva_arg(arguments, H5G_info_t *);
+                H5G_loc_t           loc;
+
+                if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+                if(loc_params->type == H5VL_OBJECT_BY_SELF) {
+                    /* H5Gget_info */
+
+                    /* Retrieve the group's information */
+                    if(H5G__obj_info(loc.oloc, group_info) < 0)
+                        HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't retrieve group info")
+                } /* end if */
+                else if(loc_params->type == H5VL_OBJECT_BY_NAME) {
+                    /* H5Gget_info_by_name */
+
+                    /* Retrieve the group's information */
+                    if(H5G__get_info_by_name(&loc, loc_params->loc_data.loc_by_name.name, group_info) < 0)
+                        HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't retrieve group info")
+                } /* end else-if */
+                else if(loc_params->type == H5VL_OBJECT_BY_IDX) {
+                    /* H5Gget_info_by_idx */
+
+                    /* Retrieve the group's information */
+                    if(H5G__get_info_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, loc_params->loc_data.loc_by_idx.idx_type,
+                            loc_params->loc_data.loc_by_idx.order, loc_params->loc_data.loc_by_idx.n, group_info) < 0)
+                        HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't retrieve group info")
+                } /* end else-if */
+                else
+                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown get info parameters")
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't get this type of information from group")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_group_get() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_group_specific
+ *
+ * Purpose:     Handles the group specific callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_group_specific(void *obj, H5VL_group_specific_t specific_type, 
+                             hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    H5G_t       *grp = (H5G_t *)obj;
+    herr_t       ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    switch(specific_type) {
+        case H5VL_GROUP_FLUSH:
+            {
+                hid_t group_id = HDva_arg(arguments, hid_t);
+
+                /* Flush object's metadata to file */
+                if(H5O_flush_common(&grp->oloc, group_id) < 0)
+                    HGOTO_ERROR(H5E_SYM, H5E_CANTFLUSH, FAIL, "unable to flush group")
+
+                break;
+            }
+
+        case H5VL_GROUP_REFRESH:
+            {
+                hid_t group_id = HDva_arg(arguments, hid_t);
+
+                /* Call private function to refresh group object */
+                if((H5O_refresh_metadata(group_id, grp->oloc)) < 0)
+                    HGOTO_ERROR(H5E_SYM, H5E_CANTLOAD, FAIL, "unable to refresh group")
+
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid specific operation")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_group_specific() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_group_optional
+ *
+ * Purpose:     Handles the group optional callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_group_optional(void *obj, hid_t H5_ATTR_UNUSED dxpl_id,
+    void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    H5VL_native_group_optional_t optional_type;
+    herr_t ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    optional_type = HDva_arg(arguments, H5VL_native_group_optional_t);
+    switch(optional_type) {
+#ifndef H5_NO_DEPRECATED_SYMBOLS
+        /* H5Giterate (deprecated) */
+        case H5VL_NATIVE_GROUP_ITERATE_OLD:
+            {
+                const H5VL_loc_params_t *loc_params = HDva_arg(arguments, const H5VL_loc_params_t *);
+                hsize_t idx = HDva_arg(arguments, hsize_t);
+                hsize_t *last_obj = HDva_arg(arguments, hsize_t *);
+                const H5G_link_iterate_t *lnk_op = HDva_arg(arguments, const H5G_link_iterate_t *);
+                void *op_data = HDva_arg(arguments, void *);
+                H5G_loc_t grp_loc;
+
+                /* Get the location struct for the object */
+                if(H5G_loc_real(obj, loc_params->obj_type, &grp_loc) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+                /* Call the actual iteration routine */
+                if((ret_value = H5G_iterate(&grp_loc, loc_params->loc_data.loc_by_name.name, H5_INDEX_NAME, H5_ITER_INC, idx, last_obj, lnk_op, op_data)) < 0)
+                    HERROR(H5E_VOL, H5E_BADITER, "error iterating over group's links");
+
+                break;
+            }
+
+        /* H5Gget_objinfo (deprecated) */
+        case H5VL_NATIVE_GROUP_GET_OBJINFO:
+            {
+                const H5VL_loc_params_t *loc_params = HDva_arg(arguments, const H5VL_loc_params_t *);
+                hbool_t follow_link = (hbool_t)HDva_arg(arguments, unsigned);
+                H5G_stat_t *statbuf = HDva_arg(arguments, H5G_stat_t *);
+                H5G_loc_t grp_loc;
+
+                /* Get the location struct for the object */
+                if(H5G_loc_real(obj, loc_params->obj_type, &grp_loc) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+                /* Call the actual group objinfo routine */
+                if(H5G__get_objinfo(&grp_loc, loc_params->loc_data.loc_by_name.name, follow_link, statbuf) < 0)
+                    HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "cannot stat object")
+
+                break;
+            }
+#endif /* H5_NO_DEPRECATED_SYMBOLS */
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid optional operation")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_group_optional() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_group_close
+ *
+ * Purpose:     Handles the group close callback
+ *
+ * Return:      Success:    SUCCEED
+ *              Failure:    FAIL (group will not be closed)
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_group_close(void *grp, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
+{
+    herr_t ret_value = SUCCEED;                 /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    if(H5G_close((H5G_t *)grp) < 0)
+        HGOTO_ERROR(H5E_SYM, H5E_CLOSEERROR, FAIL, "can't close group")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_group_close() */
+
diff --git a/src/H5VLnative_link.c b/src/H5VLnative_link.c
new file mode 100644
index 0000000..98d2ccd
--- /dev/null
+++ b/src/H5VLnative_link.c
@@ -0,0 +1,435 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Purpose:     Link callbacks for the native VOL connector
+ *
+ */
+
+#define H5L_FRIEND              /* Suppress error about including H5Lpkg    */
+
+#include "H5private.h"          /* Generic Functions                        */
+#include "H5Eprivate.h"         /* Error handling                           */
+#include "H5Gprivate.h"         /* Groups                                   */
+#include "H5Iprivate.h"         /* IDs                                      */
+#include "H5Lpkg.h"             /* Links                                    */
+#include "H5Pprivate.h"         /* Property lists                           */
+#include "H5VLprivate.h"        /* Virtual Object Layer                     */
+
+#include "H5VLnative_private.h" /* Native VOL connector                     */
+
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_link_create
+ *
+ * Purpose:     Handles the link create callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_link_create(H5VL_link_create_type_t create_type, void *obj,
+    const H5VL_loc_params_t *loc_params, hid_t lcpl_id, hid_t H5_ATTR_UNUSED lapl_id,
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
+{
+    H5P_genplist_t   *plist;                     /* Property list pointer */
+    herr_t           ret_value = SUCCEED;        /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    /* Get the plist structure */
+    if(NULL == (plist = (H5P_genplist_t *)H5I_object(lcpl_id)))
+        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID");
+
+    switch(create_type) {
+        case H5VL_LINK_CREATE_HARD:
+            {
+                H5G_loc_t    cur_loc;
+                H5G_loc_t    link_loc;
+                void         *cur_obj;
+                H5VL_loc_params_t cur_params;
+
+                if(H5P_get(plist, H5VL_PROP_LINK_TARGET, &cur_obj) < 0)
+                    HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get property value for current location id")
+                if(H5P_get(plist, H5VL_PROP_LINK_TARGET_LOC_PARAMS, &cur_params) < 0)
+                    HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get property value for current name")
+
+                if(NULL != cur_obj && H5G_loc_real(cur_obj, cur_params.obj_type, &cur_loc) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+                if(NULL != obj && H5G_loc_real(obj, loc_params->obj_type, &link_loc) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+                /* H5Lcreate_hard */
+                if(H5VL_OBJECT_BY_NAME == cur_params.type) {
+                    H5G_loc_t *cur_loc_p, *link_loc_p;
+
+                    /* Set up current & new location pointers */
+                    cur_loc_p = &cur_loc;
+                    link_loc_p = &link_loc;
+                    if(NULL == cur_obj)
+                        cur_loc_p = link_loc_p;
+                    else if(NULL == obj)
+                        link_loc_p = cur_loc_p;
+                    else if(cur_loc_p->oloc->file != link_loc_p->oloc->file)
+                        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "source and destination should be in the same file.")
+
+                    /* Create the link */
+                    if((ret_value = H5L_create_hard(cur_loc_p, cur_params.loc_data.loc_by_name.name, 
+                                                    link_loc_p, loc_params->loc_data.loc_by_name.name, lcpl_id)) < 0)
+                        HGOTO_ERROR(H5E_LINK, H5E_CANTINIT, FAIL, "unable to create link")
+                } /* end if */
+                else { /* H5Olink */
+                    /* Link to the object */
+                    if(H5L_link(&link_loc, loc_params->loc_data.loc_by_name.name, &cur_loc, lcpl_id) < 0)
+                        HGOTO_ERROR(H5E_OHDR, H5E_CANTINIT, FAIL, "unable to create link")
+                } /* end else */
+                break;
+            }
+
+        case H5VL_LINK_CREATE_SOFT:
+            {
+                char        *target_name;
+                H5G_loc_t   link_loc;               /* Group location for new link */
+
+                if(H5G_loc_real(obj, loc_params->obj_type, &link_loc) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+                if(H5P_get(plist, H5VL_PROP_LINK_TARGET_NAME, &target_name) < 0)
+                    HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get property value for targe name")
+
+                /* Create the link */
+                if((ret_value = H5L_create_soft(target_name, &link_loc, loc_params->loc_data.loc_by_name.name, lcpl_id)) < 0)
+                    HGOTO_ERROR(H5E_LINK, H5E_CANTINIT, FAIL, "unable to create link")
+                break;
+            }
+
+        case H5VL_LINK_CREATE_UD:
+            {
+                H5G_loc_t   link_loc;               /* Group location for new link */
+                H5L_type_t link_type;
+                void *udata;
+                size_t udata_size;
+
+                if(H5G_loc_real(obj, loc_params->obj_type, &link_loc) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+                if(H5P_get(plist, H5VL_PROP_LINK_TYPE, &link_type) < 0)
+                    HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get property value for link type")
+                if(H5P_get(plist, H5VL_PROP_LINK_UDATA, &udata) < 0)
+                    HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get property value for udata")
+                if(H5P_get(plist, H5VL_PROP_LINK_UDATA_SIZE, &udata_size) < 0)
+                    HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get property value for udata size")
+
+                /* Create link */
+                if(H5L__create_ud(&link_loc, loc_params->loc_data.loc_by_name.name, udata, udata_size, 
+                                 link_type, lcpl_id) < 0)
+                    HGOTO_ERROR(H5E_LINK, H5E_CANTINIT, FAIL, "unable to create link")
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_LINK, H5E_CANTINIT, FAIL, "invalid link creation call")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_link_create() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_link_copy
+ *
+ * Purpose:     Handles the link copy callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_link_copy(void *src_obj, const H5VL_loc_params_t *loc_params1, 
+    void *dst_obj, const H5VL_loc_params_t *loc_params2, hid_t lcpl_id,
+    hid_t H5_ATTR_UNUSED lapl_id, hid_t H5_ATTR_UNUSED dxpl_id,
+    void H5_ATTR_UNUSED **req)
+{
+    H5G_loc_t   src_loc, *src_loc_p;
+    H5G_loc_t   dst_loc, *dst_loc_p;
+    herr_t      ret_value = SUCCEED;        /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    if(NULL != src_obj && H5G_loc_real(src_obj, loc_params1->obj_type, &src_loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+    if(NULL != dst_obj && H5G_loc_real(dst_obj, loc_params2->obj_type, &dst_loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+    /* Set up src & dst location pointers */
+    src_loc_p = &src_loc;
+    dst_loc_p = &dst_loc;
+    if(NULL == src_obj)
+        src_loc_p = dst_loc_p;
+    else if(NULL == dst_obj)
+        dst_loc_p = src_loc_p;
+
+    /* Copy the link */
+    if(H5L_move(src_loc_p, loc_params1->loc_data.loc_by_name.name, 
+                dst_loc_p, loc_params2->loc_data.loc_by_name.name, 
+                TRUE, lcpl_id) < 0)
+        HGOTO_ERROR(H5E_LINK, H5E_CANTCOPY, FAIL, "unable to copy link")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_link_copy() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_link_move
+ *
+ * Purpose:     Handles the link move callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_link_move(void *src_obj, const H5VL_loc_params_t *loc_params1, 
+    void *dst_obj, const H5VL_loc_params_t *loc_params2, hid_t lcpl_id,
+    hid_t H5_ATTR_UNUSED lapl_id, hid_t H5_ATTR_UNUSED dxpl_id,
+    void H5_ATTR_UNUSED **req)
+{
+    H5G_loc_t   src_loc, *src_loc_p;
+    H5G_loc_t   dst_loc, *dst_loc_p;
+    herr_t      ret_value = SUCCEED;        /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    if(NULL != src_obj && H5G_loc_real(src_obj, loc_params1->obj_type, &src_loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+    if(NULL != dst_obj && H5G_loc_real(dst_obj, loc_params2->obj_type, &dst_loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+    /* Set up src & dst location pointers */
+    src_loc_p = &src_loc;
+    dst_loc_p = &dst_loc;
+    if(NULL == src_obj)
+        src_loc_p = dst_loc_p;
+    else if(NULL == dst_obj)
+        dst_loc_p = src_loc_p;
+
+    /* Move the link */
+    if(H5L_move(src_loc_p, loc_params1->loc_data.loc_by_name.name, 
+                dst_loc_p, loc_params2->loc_data.loc_by_name.name, 
+                FALSE, lcpl_id) < 0)
+        HGOTO_ERROR(H5E_LINK, H5E_CANTMOVE, FAIL, "unable to move link")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_link_move() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_link_get
+ *
+ * Purpose:     Handles the link get callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_link_get(void *obj, const H5VL_loc_params_t *loc_params, H5VL_link_get_t get_type, 
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    H5G_loc_t   loc;
+    herr_t      ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+    switch(get_type) {
+        /* H5Lget_info/H5Lget_info_by_idx */
+        case H5VL_LINK_GET_INFO:
+            {
+                H5L_info_t *linfo  = HDva_arg(arguments, H5L_info_t *);
+
+                /* Get the link information */
+                if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Lget_info */
+                    if(H5L_get_info(&loc, loc_params->loc_data.loc_by_name.name, linfo) < 0)
+                        HGOTO_ERROR(H5E_LINK, H5E_NOTFOUND, FAIL, "unable to get link info")
+                } /* end if */
+                else if(loc_params->type == H5VL_OBJECT_BY_IDX) { /* H5Lget_info_by_idx */
+                    if(H5L_get_info_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, loc_params->loc_data.loc_by_idx.idx_type,
+                            loc_params->loc_data.loc_by_idx.order, loc_params->loc_data.loc_by_idx.n, linfo) < 0)
+                        HGOTO_ERROR(H5E_LINK, H5E_NOTFOUND, FAIL, "unable to get link info")
+                } /* end else-if */
+                else
+                    HGOTO_ERROR(H5E_LINK, H5E_NOTFOUND, FAIL, "unable to get link info")
+                break;
+            }
+
+        /* H5Lget_name_by_idx */
+        case H5VL_LINK_GET_NAME:
+            {
+                char       *name   = HDva_arg(arguments, char *);
+                size_t      size   = HDva_arg(arguments, size_t);
+                ssize_t    *ret    = HDva_arg(arguments, ssize_t *);
+
+                /* Get the link name */
+                if((*ret = H5L_get_name_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, loc_params->loc_data.loc_by_idx.idx_type,
+                            loc_params->loc_data.loc_by_idx.order, loc_params->loc_data.loc_by_idx.n, name, size)) < 0)
+                    HGOTO_ERROR(H5E_LINK, H5E_NOTFOUND, FAIL, "unable to get link info")
+
+                break;
+            }
+
+        /* H5Lget_val/H5Lget_val_by_idx */
+        case H5VL_LINK_GET_VAL:
+            {
+                void       *buf    = HDva_arg(arguments, void *);
+                size_t     size    = HDva_arg(arguments, size_t);
+
+                /* Get the link information */
+                if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Lget_val */
+                    if(H5L_get_val(&loc, loc_params->loc_data.loc_by_name.name, buf, size) < 0)
+                        HGOTO_ERROR(H5E_LINK, H5E_NOTFOUND, FAIL, "unable to get link value")
+                }
+                else if(loc_params->type == H5VL_OBJECT_BY_IDX) { /* H5Lget_val_by_idx */
+
+                    if(H5L_get_val_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, loc_params->loc_data.loc_by_idx.idx_type,
+                            loc_params->loc_data.loc_by_idx.order, loc_params->loc_data.loc_by_idx.n, buf, size) < 0)
+                        HGOTO_ERROR(H5E_LINK, H5E_NOTFOUND, FAIL, "unable to get link val")                    
+                }
+                else
+                    HGOTO_ERROR(H5E_LINK, H5E_NOTFOUND, FAIL, "unable to get link val")
+
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't get this type of information from link")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_link_get() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_link_specific
+ *
+ * Purpose:     Handles the link specific callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_link_specific(void *obj, const H5VL_loc_params_t *loc_params, H5VL_link_specific_t specific_type, 
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    herr_t      ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    switch(specific_type) {
+        case H5VL_LINK_EXISTS:
+            {
+                htri_t *ret = HDva_arg(arguments, htri_t *);
+                H5G_loc_t loc;
+
+                if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+                /* Check for the existence of the link */
+                if((*ret = H5L_exists(&loc, loc_params->loc_data.loc_by_name.name)) < 0)
+                    HGOTO_ERROR(H5E_LINK, H5E_NOTFOUND, FAIL, "unable to specific link info")
+                break;
+            }
+
+        case H5VL_LINK_ITER:
+            {
+                H5G_loc_t loc;
+                hbool_t recursive       = (hbool_t)HDva_arg(arguments, unsigned);
+                H5_index_t idx_type     = (H5_index_t)HDva_arg(arguments, int); /* enum work-around */
+                H5_iter_order_t order   = (H5_iter_order_t)HDva_arg(arguments, int); /* enum work-around */
+                hsize_t *idx_p          = HDva_arg(arguments, hsize_t *);
+                H5L_iterate_t op        = HDva_arg(arguments, H5L_iterate_t);
+                void *op_data           = HDva_arg(arguments, void *);
+
+                /* Get the location */
+                if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
+
+                /* Visit or iterate over the links */
+                if(loc_params->type == H5VL_OBJECT_BY_SELF) {
+                    if(recursive) {
+                        /* H5Lvisit */
+                        if((ret_value = H5G_visit(&loc, ".", idx_type, order, op, op_data)) < 0)
+                            HGOTO_ERROR(H5E_LINK, H5E_BADITER, FAIL, "link visitation failed")
+                    } /* end if */
+                    else {
+                        /* H5Literate */
+                        if((ret_value = H5L_iterate(&loc, ".", idx_type, order, idx_p, op, op_data)) < 0)
+                            HGOTO_ERROR(H5E_LINK, H5E_BADITER, FAIL, "error iterating over links")
+                    } /* end else */
+                } /* end if */
+                else if(loc_params->type == H5VL_OBJECT_BY_NAME) {
+                    if(recursive) {
+                        /* H5Lvisit_by_name */
+                        if((ret_value = H5G_visit(&loc, loc_params->loc_data.loc_by_name.name, idx_type, order, op, op_data)) < 0)
+                            HGOTO_ERROR(H5E_LINK, H5E_BADITER, FAIL, "link visitation failed")
+                    } /* end if */
+                    else {
+                        /* H5Literate_by_name */
+                        if((ret_value = H5L_iterate(&loc, loc_params->loc_data.loc_by_name.name, idx_type, order, idx_p, op, op_data)) < 0)
+                            HGOTO_ERROR(H5E_LINK, H5E_BADITER, FAIL, "error iterating over links")
+                    } /* end else */
+                } /* end else-if */
+                else
+                    HGOTO_ERROR(H5E_LINK, H5E_UNSUPPORTED, FAIL, "unknown link iterate params")
+
+                break;
+            }
+
+        case H5VL_LINK_DELETE:
+            {
+                H5G_loc_t loc;
+
+                if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+                /* Unlink */
+                if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Ldelete */
+                    if(H5L_delete(&loc, loc_params->loc_data.loc_by_name.name) < 0)
+                        HGOTO_ERROR(H5E_LINK, H5E_CANTDELETE, FAIL, "unable to delete link")
+                } /* end if */
+                else if(loc_params->type == H5VL_OBJECT_BY_IDX) { /* H5Ldelete_by_idx */
+                    if(H5L_delete_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, loc_params->loc_data.loc_by_idx.idx_type,
+                            loc_params->loc_data.loc_by_idx.order, loc_params->loc_data.loc_by_idx.n) < 0)
+                        HGOTO_ERROR(H5E_LINK, H5E_CANTDELETE, FAIL, "unable to delete link")
+                } /* end else-if */
+                else
+                    HGOTO_ERROR(H5E_LINK, H5E_CANTDELETE, FAIL, "unable to delete link")
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "invalid specific operation")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_link_specific() */
+
diff --git a/src/H5VLnative_object.c b/src/H5VLnative_object.c
new file mode 100644
index 0000000..0b1d73a
--- /dev/null
+++ b/src/H5VLnative_object.c
@@ -0,0 +1,482 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Purpose:     Object callbacks for the native VOL connector
+ *
+ */
+
+#define H5O_FRIEND              /* Suppress error about including H5Opkg    */
+#define H5R_FRIEND              /* Suppress error about including H5Rpkg    */
+
+#include "H5private.h"          /* Generic Functions                        */
+#include "H5Eprivate.h"         /* Error handling                           */
+#include "H5Fprivate.h"         /* Files                                    */
+#include "H5Gprivate.h"         /* Groups                                   */
+#include "H5Iprivate.h"         /* IDs                                      */
+#include "H5Opkg.h"             /* Object headers                           */
+#include "H5Pprivate.h"         /* Property lists                           */
+#include "H5Rpkg.h"             /* References                               */
+#include "H5VLprivate.h"        /* Virtual Object Layer                     */
+
+#include "H5VLnative_private.h" /* Native VOL connector                     */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_object_open
+ *
+ * Purpose:     Handles the object open callback
+ *
+ * Return:      Success:    object pointer
+ *              Failure:    NULL
+ *
+ *-------------------------------------------------------------------------
+ */
+void *
+H5VL__native_object_open(void *obj, const H5VL_loc_params_t *loc_params, H5I_type_t *opened_type, 
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
+{
+    H5G_loc_t   loc;
+    void       *ret_value = NULL;
+
+    FUNC_ENTER_PACKAGE
+
+    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file or file object")
+
+    switch(loc_params->type) {
+        case H5VL_OBJECT_BY_NAME:
+            {
+                /* Open the object */
+                if(NULL == (ret_value = H5O_open_name(&loc, loc_params->loc_data.loc_by_name.name, opened_type)))
+                    HGOTO_ERROR(H5E_OHDR, H5E_CANTOPENOBJ, NULL, "unable to open object by name")
+                break;
+            }
+
+        case H5VL_OBJECT_BY_IDX:
+            {
+                /* Open the object */
+                if(NULL == (ret_value = H5O_open_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, loc_params->loc_data.loc_by_idx.idx_type,
+                        loc_params->loc_data.loc_by_idx.order, loc_params->loc_data.loc_by_idx.n, opened_type)))
+                    HGOTO_ERROR(H5E_OHDR, H5E_CANTOPENOBJ, NULL, "unable to open object by index")
+                break;
+            }
+
+        case H5VL_OBJECT_BY_ADDR:
+            {
+                /* Open the object */
+                if(NULL == (ret_value = H5O_open_by_addr(&loc, loc_params->loc_data.loc_by_addr.addr, opened_type)))
+                    HGOTO_ERROR(H5E_OHDR, H5E_CANTOPENOBJ, NULL, "unable to open object by address")
+                break;
+            }
+
+        case H5VL_OBJECT_BY_REF:
+            {
+                hid_t temp_id = H5I_INVALID_HID;
+                H5F_t *file = NULL;
+
+                /* Get the file pointer from the entry */
+                file = loc.oloc->file;
+
+                /* Create reference */
+                if((temp_id = H5R__dereference(file, loc_params->loc_data.loc_by_ref.lapl_id, 
+                                              loc_params->loc_data.loc_by_ref.ref_type, 
+                                              loc_params->loc_data.loc_by_ref._ref)) < 0)
+                    HGOTO_ERROR(H5E_REFERENCE, H5E_CANTOPENOBJ, NULL, "unable to dereference object")
+
+                *opened_type = H5I_get_type(temp_id);
+                if(NULL == (ret_value = H5I_remove(temp_id)))
+                    HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, NULL, "unable to open object")
+                break;
+            }
+
+        case H5VL_OBJECT_BY_SELF:
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, NULL, "unknown open parameters")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_object_open() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_object_copy
+ *
+ * Purpose:     Handles the object copy callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t 
+H5VL__native_object_copy(void *src_obj, const H5VL_loc_params_t *loc_params1, const char *src_name, 
+    void *dst_obj, const H5VL_loc_params_t *loc_params2, const char *dst_name, 
+    hid_t ocpypl_id, hid_t lcpl_id, hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req)
+{
+    H5G_loc_t   src_loc;                /* Source object group location */
+    H5G_loc_t   dst_loc;                /* Destination group location */
+    herr_t      ret_value = FAIL;
+    
+    FUNC_ENTER_PACKAGE
+
+    /* get location for objects */
+    if(H5G_loc_real(src_obj, loc_params1->obj_type, &src_loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+    if(H5G_loc_real(dst_obj, loc_params2->obj_type, &dst_loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+    /* Copy the object */
+    if((ret_value = H5O_copy(&src_loc, src_name, &dst_loc, dst_name, ocpypl_id, lcpl_id)) < 0)
+        HGOTO_ERROR(H5E_SYM, H5E_CANTCOPY, FAIL, "unable to copy object")    
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_object_copy() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_object_get
+ *
+ * Purpose:     Handles the object get callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_object_get(void *obj, const H5VL_loc_params_t *loc_params, H5VL_object_get_t get_type, 
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    herr_t      ret_value = SUCCEED;    /* Return value */
+    H5G_loc_t   loc;                    /* Location of group */
+
+    FUNC_ENTER_PACKAGE
+
+    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+    switch(get_type) {
+        /* H5Rget_region */
+        case H5VL_REF_GET_REGION:
+            {
+                hid_t       *ret                    =  HDva_arg(arguments, hid_t *);
+                H5R_type_t  H5_ATTR_UNUSED ref_type =  (H5R_type_t)HDva_arg(arguments, int); /* enum work-around */
+                void        *ref                    =  HDva_arg(arguments, void *);
+                H5S_t       *space = NULL;    /* Dataspace object */
+
+                /* Get the dataspace with the correct region selected */
+                if((space = H5R__get_region(loc.oloc->file, ref)) == NULL)
+                    HGOTO_ERROR(H5E_REFERENCE, H5E_CANTGET, FAIL, "unable to retrieve region")
+
+                /* Atomize */
+                if((*ret = H5I_register(H5I_DATASPACE, space, TRUE)) < 0)
+                    HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register dataspace atom")
+
+                break;
+            }
+
+        /* H5Rget_obj_type1/2 */
+        case H5VL_REF_GET_TYPE:
+            {
+                H5O_type_t  *obj_type  =  HDva_arg(arguments, H5O_type_t *);
+                H5R_type_t  ref_type   =  (H5R_type_t)HDva_arg(arguments, int); /* enum work-around */
+                void        *ref       =  HDva_arg(arguments, void *);
+
+                /* Get the object information */
+                if(H5R__get_obj_type(loc.oloc->file, ref_type, ref, obj_type) < 0)
+                    HGOTO_ERROR(H5E_REFERENCE, H5E_CANTGET, FAIL, "unable to determine object type")
+                break;
+            }
+
+        /* H5Rget_name */
+        case H5VL_REF_GET_NAME:
+            {
+                ssize_t     *ret       = HDva_arg(arguments, ssize_t *);
+                char        *name      = HDva_arg(arguments, char *);
+                size_t      size       = HDva_arg(arguments, size_t);
+                H5R_type_t  ref_type   = (H5R_type_t)HDva_arg(arguments, int); /* enum work-around */
+                void        *ref       = HDva_arg(arguments, void *);
+
+                /* Get name */
+                if((*ret = H5R__get_name(loc.oloc->file, ref_type, ref, name, size)) < 0)
+                    HGOTO_ERROR(H5E_REFERENCE, H5E_CANTGET, FAIL, "unable to determine object path")
+                break;
+            }
+
+        /* H5Iget_name */
+        case H5VL_ID_GET_NAME:
+            {
+                ssize_t *ret = HDva_arg(arguments, ssize_t *);
+                char *name = HDva_arg(arguments, char *);
+                size_t size = HDva_arg(arguments, size_t);
+
+                /* Retrieve object's name */
+                if((*ret = H5G_get_name(&loc, name, size, NULL)) < 0)
+                    HGOTO_ERROR(H5E_ATOM, H5E_CANTGET, FAIL, "can't retrieve object name")
+
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't get this type of information from object")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_object_get() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_object_specific
+ *
+ * Purpose:     Handles the object specific callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_object_specific(void *obj, const H5VL_loc_params_t *loc_params, H5VL_object_specific_t specific_type, 
+    hid_t H5_ATTR_UNUSED dxpl_id, void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    H5G_loc_t    loc;
+    herr_t       ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+    switch(specific_type) {
+        /* H5Oincr_refcount / H5Odecr_refcount */
+        case H5VL_OBJECT_CHANGE_REF_COUNT:
+            {
+                int update_ref  = HDva_arg(arguments, int);
+                H5O_loc_t  *oloc = loc.oloc;
+
+                if(H5O_link(oloc, update_ref) < 0)
+                    HGOTO_ERROR(H5E_OHDR, H5E_LINKCOUNT, FAIL, "modifying object link count failed")
+
+                break;
+            }
+
+        /* H5Oexists_by_name */
+        case H5VL_OBJECT_EXISTS:
+            {
+                htri_t *ret = HDva_arg(arguments, htri_t *);
+
+                if(loc_params->type == H5VL_OBJECT_BY_NAME) {
+                    /* Check if the object exists */
+                    if((*ret = H5G_loc_exists(&loc, loc_params->loc_data.loc_by_name.name)) < 0)
+                        HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "unable to determine if '%s' exists", loc_params->loc_data.loc_by_name.name)
+                } /* end if */
+                else
+                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown object exists parameters")
+                break;
+            }
+
+        case H5VL_OBJECT_VISIT:
+            {
+                H5_index_t idx_type     = (H5_index_t)HDva_arg(arguments, int); /* enum work-around */
+                H5_iter_order_t order   = (H5_iter_order_t)HDva_arg(arguments, int); /* enum work-around */
+                H5O_iterate_t op        = HDva_arg(arguments, H5O_iterate_t);
+                void *op_data           = HDva_arg(arguments, void *);
+                unsigned fields         = HDva_arg(arguments, unsigned);
+
+                /* Call internal object visitation routine */
+                if(loc_params->type == H5VL_OBJECT_BY_SELF) {
+                    /* H5Ovisit */
+                    if((ret_value = H5O__visit(&loc, ".", idx_type, order, op, op_data, fields)) < 0)
+                        HGOTO_ERROR(H5E_OHDR, H5E_BADITER, FAIL, "object visitation failed")
+                } /* end if */
+                else if(loc_params->type == H5VL_OBJECT_BY_NAME) {
+                    /* H5Ovisit_by_name */
+                    if((ret_value = H5O__visit(&loc, loc_params->loc_data.loc_by_name.name, idx_type, order, op, op_data, fields)) < 0)
+                        HGOTO_ERROR(H5E_OHDR, H5E_BADITER, FAIL, "object visitation failed")
+                } /* end else-if */
+                else
+                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown object visit params");
+                break;
+            }
+
+        case H5VL_OBJECT_FLUSH:
+            {
+                hid_t   oid     = HDva_arg(arguments, hid_t);
+
+                /* Flush the object's metadata */
+                if(H5O_flush(loc.oloc, oid) < 0)
+                    HGOTO_ERROR(H5E_OHDR, H5E_CANTFLUSH, FAIL, "unable to flush object")
+
+                break;
+            }
+
+        case H5VL_OBJECT_REFRESH:
+            {
+                hid_t                   oid         = HDva_arg(arguments, hid_t);
+                H5O_loc_t              *oloc        = loc.oloc;
+
+                /* Refresh the metadata */
+                if(H5O_refresh_metadata(oid, *oloc) < 0)
+                    HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, FAIL, "unable to refresh object")
+
+                break;
+            }
+
+        case H5VL_REF_CREATE:
+            {
+                void        *ref      = HDva_arg(arguments, void *);
+                const char  *name     = HDva_arg(arguments, char *);
+                H5R_type_t  ref_type  = (H5R_type_t)HDva_arg(arguments, int); /* enum work-around */
+                hid_t       space_id  = HDva_arg(arguments, hid_t);
+                H5S_t       *space = NULL;   /* Pointer to dataspace containing region */
+                
+                if(space_id != (-1) && (NULL == (space = (H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE))))
+                    HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataspace")
+
+                /* Create reference */
+                if(H5R__create(ref, &loc, name, ref_type, space) < 0)
+                    HGOTO_ERROR(H5E_REFERENCE, H5E_CANTCREATE, FAIL, "unable to create reference")
+
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't recognize this operation type")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_object_specific() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__native_object_optional
+ *
+ * Purpose:     Handles the object optional callback
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__native_object_optional(void *obj, hid_t H5_ATTR_UNUSED dxpl_id,
+    void H5_ATTR_UNUSED **req, va_list arguments)
+{
+    H5VL_native_object_optional_t optional_type = HDva_arg(arguments, H5VL_native_object_optional_t);
+    H5VL_loc_params_t *loc_params = HDva_arg(arguments, H5VL_loc_params_t *);
+    H5G_loc_t   loc;                    /* Location of group */
+    herr_t       ret_value = SUCCEED;    /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    if(H5G_loc_real(obj, loc_params->obj_type, &loc) < 0)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
+
+    switch(optional_type) {
+        /* H5Oget_info / H5Oget_info_by_name / H5Oget_info_by_idx */
+        case H5VL_NATIVE_OBJECT_GET_INFO:
+            {
+                H5O_info_t  *obj_info = HDva_arg(arguments, H5O_info_t *);
+                unsigned fields         = HDva_arg(arguments, unsigned);
+
+                if(loc_params->type == H5VL_OBJECT_BY_SELF) { /* H5Oget_info */
+                    /* Retrieve the object's information */
+                    if(H5G_loc_info(&loc, ".", obj_info, fields) < 0)
+                        HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "object not found")
+                } /* end if */
+                else if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Oget_info_by_name */
+                    /* Retrieve the object's information */
+                    if(H5G_loc_info(&loc, loc_params->loc_data.loc_by_name.name, obj_info, fields) < 0)
+                        HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "object not found")
+                } /* end else-if */
+                else if(loc_params->type == H5VL_OBJECT_BY_IDX) { /* H5Oget_info_by_idx */
+                    H5G_loc_t   obj_loc;                /* Location used to open group */
+                    H5G_name_t  obj_path;               /* Opened object group hier. path */
+                    H5O_loc_t   obj_oloc;               /* Opened object object location */
+
+                    /* Set up opened group location to fill in */
+                    obj_loc.oloc = &obj_oloc;
+                    obj_loc.path = &obj_path;
+                    H5G_loc_reset(&obj_loc);
+
+                    /* Find the object's location, according to the order in the index */
+                    if(H5G_loc_find_by_idx(&loc, loc_params->loc_data.loc_by_idx.name, 
+                                           loc_params->loc_data.loc_by_idx.idx_type, 
+                                           loc_params->loc_data.loc_by_idx.order, 
+                                           loc_params->loc_data.loc_by_idx.n, &obj_loc/*out*/) < 0)
+                        HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "group not found")
+
+                    /* Retrieve the object's information */
+                    if(H5O_get_info(obj_loc.oloc, obj_info, fields) < 0) {
+                        H5G_loc_free(&obj_loc);
+                        HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't retrieve object info")
+                    } /* end if */
+
+                    /* Release the object location */
+                    if(H5G_loc_free(&obj_loc) < 0)
+                        HGOTO_ERROR(H5E_OHDR, H5E_CANTRELEASE, FAIL, "can't free location")
+                } /* end else-if */
+                else
+                    HGOTO_ERROR(H5E_OHDR, H5E_UNSUPPORTED, FAIL, "unknown get info parameters")
+                break;
+            }
+
+        /* H5Oget_comment / H5Oget_comment_by_name */
+        case H5VL_NATIVE_OBJECT_GET_COMMENT:
+            {
+                char     *comment =  HDva_arg(arguments, char *);
+                size_t   bufsize  =  HDva_arg(arguments, size_t);
+                ssize_t  *ret     =  HDva_arg(arguments, ssize_t *);
+
+                /* Retrieve the object's comment */
+                if(loc_params->type == H5VL_OBJECT_BY_SELF) { /* H5Oget_comment */
+                    if((*ret = H5G_loc_get_comment(&loc, ".", comment/*out*/, bufsize)) < 0)
+                        HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "object not found")
+                } /* end if */
+                else if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Oget_comment_by_name */
+                    if((*ret = H5G_loc_get_comment(&loc, loc_params->loc_data.loc_by_name.name, comment/*out*/, bufsize)) < 0)
+                        HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "object not found")
+                } /* end else-if */
+                else
+                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown set_coment parameters")
+                break;
+            }
+
+        /* H5Oset_comment */
+        case H5VL_NATIVE_OBJECT_SET_COMMENT:
+            {
+                const char    *comment  = HDva_arg(arguments, char *);
+
+                if(loc_params->type == H5VL_OBJECT_BY_SELF) { /* H5Oset_comment */
+                    /* (Re)set the object's comment */
+                    if(H5G_loc_set_comment(&loc, ".", comment) < 0)
+                        HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "object not found")
+                } /* end if */
+                else if(loc_params->type == H5VL_OBJECT_BY_NAME) { /* H5Oset_comment_by_name */
+                    /* (Re)set the object's comment */
+                    if(H5G_loc_set_comment(&loc, loc_params->loc_data.loc_by_name.name, comment) < 0)
+                        HGOTO_ERROR(H5E_OHDR, H5E_NOTFOUND, FAIL, "object not found")
+                } /* end else-if */
+                else
+                    HGOTO_ERROR(H5E_VOL, H5E_UNSUPPORTED, FAIL, "unknown set_coment parameters")
+                break;
+            }
+
+        default:
+            HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't perform this operation on object");       
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__native_object_optional() */
+
diff --git a/src/H5VLnative_private.h b/src/H5VLnative_private.h
new file mode 100644
index 0000000..1bf4da2
--- /dev/null
+++ b/src/H5VLnative_private.h
@@ -0,0 +1,88 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Purpose:	The private header file for the native VOL connector.
+ */
+
+#ifndef _H5VLnative_private_H
+#define _H5VLnative_private_H
+
+#include "H5VLnative.h"             /* Native VOL connector                 */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Atrribute callbacks */
+H5_DLL void *H5VL__native_attr_create(void *obj, const H5VL_loc_params_t *loc_params, const char *attr_name, hid_t acpl_id, hid_t aapl_id, hid_t dxpl_id, void **req);
+void *H5VL__native_attr_open(void *obj, const H5VL_loc_params_t *loc_params, const char *attr_name, hid_t aapl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VL__native_attr_read(void *attr, hid_t dtype_id, void *buf, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VL__native_attr_write(void *attr, hid_t dtype_id, const void *buf, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VL__native_attr_get(void *obj, H5VL_attr_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_attr_specific(void *obj, const H5VL_loc_params_t *loc_params, H5VL_attr_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_attr_optional(void *obj, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_attr_close(void *attr, hid_t dxpl_id, void **req);
+
+/* Dataset callbacks */
+H5_DLL void *H5VL__native_dataset_create(void *obj, const H5VL_loc_params_t *loc_params, const char *name, hid_t dcpl_id, hid_t dapl_id, hid_t dxpl_id, void **req);
+H5_DLL void *H5VL__native_dataset_open(void *obj, const H5VL_loc_params_t *loc_params, const char *name, hid_t dapl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VL__native_dataset_read(void *dset, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id, hid_t plist_id, void *buf, void **req);
+H5_DLL herr_t H5VL__native_dataset_write(void *dset, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id, hid_t plist_id, const void *buf, void **req);
+H5_DLL herr_t H5VL__native_dataset_get(void *dset, H5VL_dataset_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_dataset_specific(void *dset, H5VL_dataset_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_dataset_optional(void *dset, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_dataset_close(void *dset, hid_t dxpl_id, void **req);
+
+/* File callbacks */
+H5_DLL void *H5VL__native_file_create(const char *name, unsigned flags, hid_t fcpl_id, hid_t fapl_id, hid_t dxpl_id, void **req);
+H5_DLL void *H5VL__native_file_open(const char *name, unsigned flags, hid_t fapl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VL__native_file_get(void *file, H5VL_file_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_file_specific(void *file, H5VL_file_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_file_optional(void *file, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_file_close(void *file, hid_t dxpl_id, void **req);
+
+/* Group callbacks */
+H5_DLL void *H5VL__native_group_create(void *obj, const H5VL_loc_params_t *loc_params, const char *name, hid_t gcpl_id, hid_t gapl_id, hid_t dxpl_id, void **req);
+H5_DLL void *H5VL__native_group_open(void *obj, const H5VL_loc_params_t *loc_params, const char *name, hid_t gapl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VL__native_group_get(void *obj, H5VL_group_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_group_specific(void *obj, H5VL_group_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_group_optional(void *obj, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_group_close(void *grp, hid_t dxpl_id, void **req);
+
+/* Link callbacks */
+H5_DLL herr_t H5VL__native_link_create(H5VL_link_create_type_t create_type, void *obj, const H5VL_loc_params_t *loc_params, hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VL__native_link_copy(void *src_obj, const H5VL_loc_params_t *loc_params1, void *dst_obj, const H5VL_loc_params_t *loc_params2, hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VL__native_link_move(void *src_obj, const H5VL_loc_params_t *loc_params1, void *dst_obj, const H5VL_loc_params_t *loc_params2, hid_t lcpl_id, hid_t lapl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VL__native_link_get(void *obj, const H5VL_loc_params_t *loc_params, H5VL_link_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_link_specific(void *obj, const H5VL_loc_params_t *loc_params, H5VL_link_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
+
+/* Object callbacks */
+H5_DLL void *H5VL__native_object_open(void *obj, const H5VL_loc_params_t *loc_params, H5I_type_t *opened_type, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VL__native_object_copy(void *src_obj, const H5VL_loc_params_t *loc_params1, const char *src_name, void *dst_obj, const H5VL_loc_params_t *loc_params2, const char *dst_name, hid_t ocpypl_id, hid_t lcpl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VL__native_object_get(void *obj, const H5VL_loc_params_t *loc_params, H5VL_object_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_object_specific(void *obj, const H5VL_loc_params_t *loc_params, H5VL_object_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_object_optional(void *obj, hid_t dxpl_id, void **req, va_list arguments);
+
+/* Datatype callbacks */
+H5_DLL void *H5VL__native_datatype_commit(void *obj, const H5VL_loc_params_t *loc_params, const char *name, hid_t type_id, hid_t lcpl_id, hid_t tcpl_id, hid_t tapl_id, hid_t dxpl_id, void **req);
+H5_DLL void *H5VL__native_datatype_open(void *obj, const H5VL_loc_params_t *loc_params, const char *name, hid_t tapl_id, hid_t dxpl_id, void **req);
+H5_DLL herr_t H5VL__native_datatype_get(void *dt, H5VL_datatype_get_t get_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_datatype_specific(void *dt, H5VL_datatype_specific_t specific_type, hid_t dxpl_id, void **req, va_list arguments);
+H5_DLL herr_t H5VL__native_datatype_close(void *dt, hid_t dxpl_id, void **req);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _H5VLnative_private_H */
+
diff --git a/src/H5VLpassthru.c b/src/H5VLpassthru.c
index a93ac9a..13d8d8e 100644
--- a/src/H5VLpassthru.c
+++ b/src/H5VLpassthru.c
@@ -11,14 +11,14 @@
  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
 /*
- * Purpose:	This is a "pass through" VOL connector, which forwards each
- *		VOL callback to an underlying connector.
- *
- *		It is designed as an example VOL connector for developers to
- *		use when creating new connectors, especially connectors that
- *		are outside of the HDF5 library.  As such, it should _NOT_
- *		include _any_ private HDF5 header files.  This connector should
- *		therefore only make public HDF5 API calls and use standard C /
+ * Purpose:     This is a "pass through" VOL connector, which forwards each
+ *              VOL callback to an underlying connector.
+ *
+ *              It is designed as an example VOL connector for developers to
+ *              use when creating new connectors, especially connectors that
+ *              are outside of the HDF5 library.  As such, it should _NOT_
+ *              include _any_ private HDF5 header files.  This connector should
+ *              therefore only make public HDF5 API calls and use standard C /
  *              POSIX calls.
  */
 
@@ -26,6 +26,7 @@
 /* Header files needed */
 /* (Public HDF5 and standard C / POSIX only) */
 #include <assert.h>
+#include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -39,8 +40,14 @@
 
 /* Whether to display log messge when callback is invoked */
 /* (Uncomment to enable) */
-/* #define ENABLE_LOGGING */
+/* #define ENABLE_PASSTHRU_LOGGING */
 
+/* Hack for missing va_copy() in old Visual Studio editions
+ * (from H5win2_defs.h - used on VS2012 and earlier)
+ */
+#if defined(_WIN32) && defined(_MSC_VER) && (_MSC_VER < 1800)
+#define va_copy(D,S)      ((D) = (S))
+#endif
 
 /************/
 /* Typedefs */
@@ -161,11 +168,11 @@ static herr_t H5VL_pass_through_request_free(void *req);
 static const H5VL_class_t H5VL_pass_through_g = {
     H5VL_PASSTHRU_VERSION,                          /* version      */
     (H5VL_class_value_t)H5VL_PASSTHRU_VALUE,        /* value        */
-    H5VL_PASSTHRU_NAME,				    /* name         */
+    H5VL_PASSTHRU_NAME,                             /* name         */
     0,                                              /* capability flags */
     H5VL_pass_through_init,                         /* initialize   */
     H5VL_pass_through_term,                         /* terminate    */
-    sizeof(H5VL_pass_through_t),                    /* info size    */
+    sizeof(H5VL_pass_through_info_t),               /* info size    */
     H5VL_pass_through_info_copy,                    /* info copy    */
     H5VL_pass_through_info_cmp,                     /* info compare */
     H5VL_pass_through_info_free,                    /* info free    */
@@ -252,10 +259,10 @@ static hid_t H5VL_PASSTHRU_g = H5I_INVALID_HID;
 /*-------------------------------------------------------------------------
  * Function:    H5VL__pass_through_new_obj
  *
- * Purpose:	Create a new pass through object for an underlying object
+ * Purpose:     Create a new pass through object for an underlying object
  *
- * Return:	Success:	Pointer to the new pass through object
- *		Failure:	NULL
+ * Return:      Success:    Pointer to the new pass through object
+ *              Failure:    NULL
  *
  * Programmer:  Quincey Koziol
  *              Monday, December 3, 2018
@@ -272,17 +279,17 @@ H5VL_pass_through_new_obj(void *under_obj, hid_t under_vol_id)
     new_obj->under_vol_id = under_vol_id;
     H5Iinc_ref(new_obj->under_vol_id);
 
-    return(new_obj);
+    return new_obj;
 } /* end H5VL__pass_through_new_obj() */
 
 
 /*-------------------------------------------------------------------------
  * Function:    H5VL__pass_through_free_obj
  *
- * Purpose:	Release a pass through object
+ * Purpose:     Release a pass through object
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  * Programmer:  Quincey Koziol
  *              Monday, December 3, 2018
@@ -295,18 +302,18 @@ H5VL_pass_through_free_obj(H5VL_pass_through_t *obj)
     H5Idec_ref(obj->under_vol_id);
     free(obj);
 
-    return(0);
+    return 0;
 } /* end H5VL__pass_through_free_obj() */
 
 
 /*-------------------------------------------------------------------------
  * Function:    H5VL_pass_through_register
  *
- * Purpose:	Register the pass-through VOL connector and retrieve an ID
- *		for it.
+ * Purpose:     Register the pass-through VOL connector and retrieve an ID
+ *              for it.
  *
- * Return:	Success:	The ID for the pass-through VOL connector
- *		Failure:	-1
+ * Return:      Success:    The ID for the pass-through VOL connector
+ *              Failure:    -1
  *
  * Programmer:  Quincey Koziol
  *              Wednesday, November 28, 2018
@@ -323,7 +330,7 @@ H5VL_pass_through_register(void)
     if(H5I_VOL != H5Iget_type(H5VL_PASSTHRU_g))
         H5VL_PASSTHRU_g = H5VLregister_connector(&H5VL_pass_through_g, H5P_DEFAULT);
 
-    return(H5VL_PASSTHRU_g);
+    return H5VL_PASSTHRU_g;
 } /* end H5VL_pass_through_register() */
 
 
@@ -331,25 +338,25 @@ H5VL_pass_through_register(void)
  * Function:    H5VL_pass_through_init
  *
  * Purpose:     Initialize this VOL connector, performing any necessary
- *		operations for the connector that will apply to all containers
+ *              operations for the connector that will apply to all containers
  *              accessed with the connector.
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
 static herr_t
 H5VL_pass_through_init(hid_t vipl_id)
 {
-#ifdef ENABLE_LOGGING
+#ifdef ENABLE_PASSTHRU_LOGGING
     printf("------- PASS THROUGH VOL INIT\n");
 #endif
 
     /* Shut compiler up about unused parameter */
     vipl_id = vipl_id;
 
-    return(0);
+    return 0;
 } /* end H5VL_pass_through_init() */
 
 
@@ -357,26 +364,26 @@ H5VL_pass_through_init(hid_t vipl_id)
  * Function:    H5VL_pass_through_term
  *
  * Purpose:     Terminate this VOL connector, performing any necessary
- *		operations for the connector that release connector-wide
- *		resources (usually created / initialized with the 'init'
- *		callback).
+ *              operations for the connector that release connector-wide
+ *              resources (usually created / initialized with the 'init'
+ *              callback).
  *
- * Return:	Success:	0
- *		Failure:	(Can't fail)
+ * Return:      Success:    0
+ *              Failure:    (Can't fail)
  *
  *---------------------------------------------------------------------------
  */
 static herr_t
 H5VL_pass_through_term(void)
 {
-#ifdef ENABLE_LOGGING
+#ifdef ENABLE_PASSTHRU_LOGGING
     printf("------- PASS THROUGH VOL TERM\n");
 #endif
 
     /* Reset VOL ID */
     H5VL_PASSTHRU_g = H5I_INVALID_HID;
 
-    return(0);
+    return 0;
 } /* end H5VL_pass_through_term() */
 
 
@@ -385,8 +392,8 @@ H5VL_pass_through_term(void)
  *
  * Purpose:     Duplicate the connector's info object.
  *
- * Returns:	Success:	New connector info object
- *		Failure:	NULL
+ * Returns:     Success:    New connector info object
+ *              Failure:    NULL
  *
  *---------------------------------------------------------------------------
  */
@@ -396,7 +403,7 @@ H5VL_pass_through_info_copy(const void *_info)
     const H5VL_pass_through_info_t *info = (const H5VL_pass_through_info_t *)_info;
     H5VL_pass_through_info_t *new_info;
 
-#ifdef ENABLE_LOGGING
+#ifdef ENABLE_PASSTHRU_LOGGING
     printf("------- PASS THROUGH VOL INFO Copy\n");
 #endif
 
@@ -409,7 +416,7 @@ H5VL_pass_through_info_copy(const void *_info)
     if(info->under_vol_info)
         H5VLcopy_connector_info(new_info->under_vol_id, &(new_info->under_vol_info), info->under_vol_info);
 
-    return(new_info);
+    return new_info;
 } /* end H5VL_pass_through_info_copy() */
 
 
@@ -417,10 +424,10 @@ H5VL_pass_through_info_copy(const void *_info)
  * Function:    H5VL_pass_through_info_cmp
  *
  * Purpose:     Compare two of the connector's info objects, setting *cmp_value,
- *		following the same rules as strcmp().
+ *              following the same rules as strcmp().
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *---------------------------------------------------------------------------
  */
@@ -430,7 +437,7 @@ H5VL_pass_through_info_cmp(int *cmp_value, const void *_info1, const void *_info
     const H5VL_pass_through_info_t *info1 = (const H5VL_pass_through_info_t *)_info1;
     const H5VL_pass_through_info_t *info2 = (const H5VL_pass_through_info_t *)_info2;
 
-#ifdef ENABLE_LOGGING
+#ifdef ENABLE_PASSTHRU_LOGGING
     printf("------- PASS THROUGH VOL INFO Compare\n");
 #endif
 
@@ -444,14 +451,14 @@ H5VL_pass_through_info_cmp(int *cmp_value, const void *_info1, const void *_info
     /* Compare under VOL connector classes */
     H5VLcmp_connector_cls(cmp_value, info1->under_vol_id, info2->under_vol_id);
     if(*cmp_value != 0)
-        return(0);
+        return 0;
 
     /* Compare under VOL connector info objects */
     H5VLcmp_connector_info(cmp_value, info1->under_vol_id, info1->under_vol_info, info2->under_vol_info);
     if(*cmp_value != 0)
-        return(0);
+        return 0;
 
-    return(0);
+    return 0;
 } /* end H5VL_pass_through_info_cmp() */
 
 
@@ -460,8 +467,8 @@ H5VL_pass_through_info_cmp(int *cmp_value, const void *_info1, const void *_info
  *
  * Purpose:     Release an info object for the connector.
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *---------------------------------------------------------------------------
  */
@@ -470,7 +477,7 @@ H5VL_pass_through_info_free(void *_info)
 {
     H5VL_pass_through_info_t *info = (H5VL_pass_through_info_t *)_info;
 
-#ifdef ENABLE_LOGGING
+#ifdef ENABLE_PASSTHRU_LOGGING
     printf("------- PASS THROUGH VOL INFO Free\n");
 #endif
 
@@ -482,7 +489,7 @@ H5VL_pass_through_info_free(void *_info)
     /* Free pass through info object itself */
     free(info);
 
-    return(0);
+    return 0;
 } /* end H5VL_pass_through_info_free() */
 
 
@@ -491,8 +498,8 @@ H5VL_pass_through_info_free(void *_info)
  *
  * Purpose:     Serialize an info object for this connector into a string
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *---------------------------------------------------------------------------
  */
@@ -504,7 +511,7 @@ H5VL_pass_through_info_to_str(const void *_info, char **str)
     char *under_vol_string = NULL;
     size_t under_vol_str_len = 0;
 
-#ifdef ENABLE_LOGGING
+#ifdef ENABLE_PASSTHRU_LOGGING
     printf("------- PASS THROUGH VOL INFO To String\n");
 #endif
 
@@ -520,10 +527,14 @@ H5VL_pass_through_info_to_str(const void *_info, char **str)
     *str = (char *)H5allocate_memory(32 + under_vol_str_len, (hbool_t)0);
     assert(*str);
 
-    /* Encode our info */
-    snprintf(*str, 32 + under_vol_str_len, "under_vol=%u;under_info={%s}", (unsigned)under_value, (under_vol_string ? under_vol_string : ""));
+    /* Encode our info
+     * Normally we'd use snprintf() here for a little extra safety, but that
+     * call had problems on Windows until recently. So, to be as platform-independent
+     * as we can, we're using sprintf() instead.
+     */
+    sprintf(*str, "under_vol=%u;under_info={%s}", (unsigned)under_value, (under_vol_string ? under_vol_string : ""));
 
-    return(0);
+    return 0;
 } /* end H5VL_pass_through_info_to_str() */
 
 
@@ -532,8 +543,8 @@ H5VL_pass_through_info_to_str(const void *_info, char **str)
  *
  * Purpose:     Deserialize a string into an info object for this connector.
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *---------------------------------------------------------------------------
  */
@@ -546,7 +557,7 @@ H5VL_pass_through_str_to_info(const char *str, void **_info)
     hid_t under_vol_id;
     void *under_vol_info = NULL;
     
-#ifdef ENABLE_LOGGING
+#ifdef ENABLE_PASSTHRU_LOGGING
     printf("------- PASS THROUGH VOL INFO String To Info\n");
 #endif
 
@@ -576,7 +587,7 @@ H5VL_pass_through_str_to_info(const char *str, void **_info)
     /* Set return value */
     *_info = info;
 
-    return(0);
+    return 0;
 } /* end H5VL_pass_through_str_to_info() */
 
 
@@ -585,8 +596,8 @@ H5VL_pass_through_str_to_info(const char *str, void **_info)
  *
  * Purpose:     Retrieve the 'data' for a VOL object.
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *---------------------------------------------------------------------------
  */
@@ -595,11 +606,11 @@ H5VL_pass_through_get_object(const void *obj)
 {
     const H5VL_pass_through_t *o = (const H5VL_pass_through_t *)obj;
 
-#ifdef ENABLE_LOGGING
+#ifdef ENABLE_PASSTHRU_LOGGING
     printf("------- PASS THROUGH VOL Get object\n");
 #endif
 
-    return(H5VLget_object(o->under_object, o->under_vol_id));
+    return H5VLget_object(o->under_object, o->under_vol_id);
 } /* end H5VL_pass_through_get_object() */
 
 
@@ -608,8 +619,8 @@ H5VL_pass_through_get_object(const void *obj)
  *
  * Purpose:     Retrieve a "wrapper context" for an object
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *---------------------------------------------------------------------------
  */
@@ -619,7 +630,7 @@ H5VL_pass_through_get_wrap_ctx(const void *obj, void **wrap_ctx)
     const H5VL_pass_through_t *o = (const H5VL_pass_through_t *)obj;
     H5VL_pass_through_wrap_ctx_t *new_wrap_ctx;
 
-#ifdef ENABLE_LOGGING
+#ifdef ENABLE_PASSTHRU_LOGGING
     printf("------- PASS THROUGH VOL WRAP CTX Get\n");
 #endif
 
@@ -634,7 +645,7 @@ H5VL_pass_through_get_wrap_ctx(const void *obj, void **wrap_ctx)
     /* Set wrap context to return */
     *wrap_ctx = new_wrap_ctx;
 
-    return(0);
+    return 0;
 } /* end H5VL_pass_through_get_wrap_ctx() */
 
 
@@ -643,8 +654,8 @@ H5VL_pass_through_get_wrap_ctx(const void *obj, void **wrap_ctx)
  *
  * Purpose:     Use a "wrapper context" to wrap a data object
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *---------------------------------------------------------------------------
  */
@@ -655,7 +666,7 @@ H5VL_pass_through_wrap_object(void *obj, void *_wrap_ctx)
     H5VL_pass_through_t *new_obj;
     void *under;
 
-#ifdef ENABLE_LOGGING
+#ifdef ENABLE_PASSTHRU_LOGGING
     printf("------- PASS THROUGH VOL WRAP Object\n");
 #endif
 
@@ -666,7 +677,7 @@ H5VL_pass_through_wrap_object(void *obj, void *_wrap_ctx)
     else
         new_obj = NULL;
 
-    return(new_obj);
+    return new_obj;
 } /* end H5VL_pass_through_wrap_object() */
 
 
@@ -675,8 +686,8 @@ H5VL_pass_through_wrap_object(void *obj, void *_wrap_ctx)
  *
  * Purpose:     Release a "wrapper context" for an object
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *---------------------------------------------------------------------------
  */
@@ -685,7 +696,7 @@ H5VL_pass_through_free_wrap_ctx(void *_wrap_ctx)
 {
     H5VL_pass_through_wrap_ctx_t *wrap_ctx = (H5VL_pass_through_wrap_ctx_t *)_wrap_ctx;
 
-#ifdef ENABLE_LOGGING
+#ifdef ENABLE_PASSTHRU_LOGGING
     printf("------- PASS THROUGH VOL WRAP CTX Free\n");
 #endif
 
@@ -697,17 +708,17 @@ H5VL_pass_through_free_wrap_ctx(void *_wrap_ctx)
     /* Free pass through wrap context object itself */
     free(wrap_ctx);
 
-    return(0);
+    return 0;
 } /* end H5VL_pass_through_free_wrap_ctx() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_attr_create
+ * Function:    H5VL_pass_through_attr_create
  *
- * Purpose:	Creates an attribute on an object.
+ * Purpose:     Creates an attribute on an object.
  *
- * Return:	Success:	Pointer to attribute object
- *		Failure:	NULL
+ * Return:      Success:    Pointer to attribute object
+ *              Failure:    NULL
  *
  *-------------------------------------------------------------------------
  */
@@ -719,7 +730,7 @@ H5VL_pass_through_attr_create(void *obj, const H5VL_loc_params_t *loc_params,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     void *under;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL ATTRIBUTE Create\n");
 #endif
 
@@ -734,17 +745,17 @@ H5VL_pass_through_attr_create(void *obj, const H5VL_loc_params_t *loc_params,
     else
         attr = NULL;
 
-    return((void*)attr);
+    return (void*)attr;
 } /* end H5VL_pass_through_attr_create() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_attr_open
+ * Function:    H5VL_pass_through_attr_open
  *
- * Purpose:	Opens an attribute on an object.
+ * Purpose:     Opens an attribute on an object.
  *
- * Return:	Success:	Pointer to attribute object
- *		Failure:	NULL
+ * Return:      Success:    Pointer to attribute object
+ *              Failure:    NULL
  *
  *-------------------------------------------------------------------------
  */
@@ -756,7 +767,7 @@ H5VL_pass_through_attr_open(void *obj, const H5VL_loc_params_t *loc_params,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     void *under;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL ATTRIBUTE Open\n");
 #endif
 
@@ -771,17 +782,17 @@ H5VL_pass_through_attr_open(void *obj, const H5VL_loc_params_t *loc_params,
     else
         attr = NULL;
 
-    return((void *)attr);
+    return (void *)attr;
 } /* end H5VL_pass_through_attr_open() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_attr_read
+ * Function:    H5VL_pass_through_attr_read
  *
- * Purpose:	Reads data from attribute.
+ * Purpose:     Reads data from attribute.
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -792,7 +803,7 @@ H5VL_pass_through_attr_read(void *attr, hid_t mem_type_id, void *buf,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)attr;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL ATTRIBUTE Read\n");
 #endif
 
@@ -802,17 +813,17 @@ H5VL_pass_through_attr_read(void *attr, hid_t mem_type_id, void *buf,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_attr_read() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_attr_write
+ * Function:    H5VL_pass_through_attr_write
  *
- * Purpose:	Writes data to attribute.
+ * Purpose:     Writes data to attribute.
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -823,7 +834,7 @@ H5VL_pass_through_attr_write(void *attr, hid_t mem_type_id, const void *buf,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)attr;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL ATTRIBUTE Write\n");
 #endif
 
@@ -833,17 +844,17 @@ H5VL_pass_through_attr_write(void *attr, hid_t mem_type_id, const void *buf,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_attr_write() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_attr_get
+ * Function:    H5VL_pass_through_attr_get
  *
- * Purpose:	Gets information about an attribute
+ * Purpose:     Gets information about an attribute
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -854,7 +865,7 @@ H5VL_pass_through_attr_get(void *obj, H5VL_attr_get_t get_type, hid_t dxpl_id,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL ATTRIBUTE Get\n");
 #endif
 
@@ -864,17 +875,17 @@ H5VL_pass_through_attr_get(void *obj, H5VL_attr_get_t get_type, hid_t dxpl_id,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_attr_get() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_attr_specific
+ * Function:    H5VL_pass_through_attr_specific
  *
- * Purpose:	Specific operation on attribute
+ * Purpose:     Specific operation on attribute
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -885,7 +896,7 @@ H5VL_pass_through_attr_specific(void *obj, const H5VL_loc_params_t *loc_params,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL ATTRIBUTE Specific\n");
 #endif
 
@@ -895,7 +906,7 @@ H5VL_pass_through_attr_specific(void *obj, const H5VL_loc_params_t *loc_params,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_attr_specific() */
 
 
@@ -904,8 +915,8 @@ H5VL_pass_through_attr_specific(void *obj, const H5VL_loc_params_t *loc_params,
  *
  * Purpose:     Perform a connector-specific operation on an attribute
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -916,7 +927,7 @@ H5VL_pass_through_attr_optional(void *obj, hid_t dxpl_id, void **req,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL ATTRIBUTE Optional\n");
 #endif
 
@@ -926,17 +937,17 @@ H5VL_pass_through_attr_optional(void *obj, hid_t dxpl_id, void **req,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_attr_optional() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_attr_close
+ * Function:    H5VL_pass_through_attr_close
  *
- * Purpose:	Closes an attribute.
+ * Purpose:     Closes an attribute.
  *
- * Return:	Success:	0
- *		Failure:	-1, attr not closed.
+ * Return:      Success:    0
+ *              Failure:    -1, attr not closed.
  *
  *-------------------------------------------------------------------------
  */
@@ -946,7 +957,7 @@ H5VL_pass_through_attr_close(void *attr, hid_t dxpl_id, void **req)
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)attr;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL ATTRIBUTE Close\n");
 #endif
 
@@ -960,7 +971,7 @@ H5VL_pass_through_attr_close(void *attr, hid_t dxpl_id, void **req)
     if(ret_value >= 0)
         H5VL_pass_through_free_obj(o);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_attr_close() */
 
 
@@ -982,7 +993,7 @@ H5VL_pass_through_dataset_create(void *obj, const H5VL_loc_params_t *loc_params,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     void *under;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL DATASET Create\n");
 #endif
 
@@ -997,7 +1008,7 @@ H5VL_pass_through_dataset_create(void *obj, const H5VL_loc_params_t *loc_params,
     else
         dset = NULL;
 
-    return((void *)dset);
+    return (void *)dset;
 } /* end H5VL_pass_through_dataset_create() */
 
 
@@ -1019,7 +1030,7 @@ H5VL_pass_through_dataset_open(void *obj, const H5VL_loc_params_t *loc_params,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     void *under;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL DATASET Open\n");
 #endif
 
@@ -1034,7 +1045,7 @@ H5VL_pass_through_dataset_open(void *obj, const H5VL_loc_params_t *loc_params,
     else
         dset = NULL;
 
-    return((void *)dset);
+    return (void *)dset;
 } /* end H5VL_pass_through_dataset_open() */
 
 
@@ -1043,8 +1054,8 @@ H5VL_pass_through_dataset_open(void *obj, const H5VL_loc_params_t *loc_params,
  *
  * Purpose:     Reads data elements from a dataset into a buffer.
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -1055,7 +1066,7 @@ H5VL_pass_through_dataset_read(void *dset, hid_t mem_type_id, hid_t mem_space_id
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)dset;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL DATASET Read\n");
 #endif
 
@@ -1065,7 +1076,7 @@ H5VL_pass_through_dataset_read(void *dset, hid_t mem_type_id, hid_t mem_space_id
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_dataset_read() */
 
 
@@ -1074,8 +1085,8 @@ H5VL_pass_through_dataset_read(void *dset, hid_t mem_type_id, hid_t mem_space_id
  *
  * Purpose:     Writes data elements from a buffer into a dataset.
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -1086,7 +1097,7 @@ H5VL_pass_through_dataset_write(void *dset, hid_t mem_type_id, hid_t mem_space_i
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)dset;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL DATASET Write\n");
 #endif
 
@@ -1096,7 +1107,7 @@ H5VL_pass_through_dataset_write(void *dset, hid_t mem_type_id, hid_t mem_space_i
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_dataset_write() */
 
 
@@ -1105,8 +1116,8 @@ H5VL_pass_through_dataset_write(void *dset, hid_t mem_type_id, hid_t mem_space_i
  *
  * Purpose:     Gets information about a dataset
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -1117,7 +1128,7 @@ H5VL_pass_through_dataset_get(void *dset, H5VL_dataset_get_t get_type,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)dset;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL DATASET Get\n");
 #endif
 
@@ -1127,17 +1138,17 @@ H5VL_pass_through_dataset_get(void *dset, H5VL_dataset_get_t get_type,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_dataset_get() */
 
 
 /*-------------------------------------------------------------------------
  * Function:    H5VL_pass_through_dataset_specific
  *
- * Purpose:	Specific operation on a dataset
+ * Purpose:     Specific operation on a dataset
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -1148,7 +1159,7 @@ H5VL_pass_through_dataset_specific(void *obj, H5VL_dataset_specific_t specific_t
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL H5Dspecific\n");
 #endif
 
@@ -1158,7 +1169,7 @@ H5VL_pass_through_dataset_specific(void *obj, H5VL_dataset_specific_t specific_t
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_dataset_specific() */
 
 
@@ -1167,8 +1178,8 @@ H5VL_pass_through_dataset_specific(void *obj, H5VL_dataset_specific_t specific_t
  *
  * Purpose:     Perform a connector-specific operation on a dataset
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -1179,7 +1190,7 @@ H5VL_pass_through_dataset_optional(void *obj, hid_t dxpl_id, void **req,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL DATASET Optional\n");
 #endif
 
@@ -1189,7 +1200,7 @@ H5VL_pass_through_dataset_optional(void *obj, hid_t dxpl_id, void **req,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_dataset_optional() */
 
 
@@ -1198,8 +1209,8 @@ H5VL_pass_through_dataset_optional(void *obj, hid_t dxpl_id, void **req,
  *
  * Purpose:     Closes a dataset.
  *
- * Return:	Success:	0
- *		Failure:	-1, dataset not closed.
+ * Return:      Success:    0
+ *              Failure:    -1, dataset not closed.
  *
  *-------------------------------------------------------------------------
  */
@@ -1209,7 +1220,7 @@ H5VL_pass_through_dataset_close(void *dset, hid_t dxpl_id, void **req)
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)dset;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL DATASET Close\n");
 #endif
 
@@ -1223,17 +1234,17 @@ H5VL_pass_through_dataset_close(void *dset, hid_t dxpl_id, void **req)
     if(ret_value >= 0)
         H5VL_pass_through_free_obj(o);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_dataset_close() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_datatype_commit
+ * Function:    H5VL_pass_through_datatype_commit
  *
- * Purpose:	Commits a datatype inside a container.
+ * Purpose:     Commits a datatype inside a container.
  *
- * Return:	Success:	Pointer to datatype object
- *		Failure:	NULL
+ * Return:      Success:    Pointer to datatype object
+ *              Failure:    NULL
  *
  *-------------------------------------------------------------------------
  */
@@ -1246,7 +1257,7 @@ H5VL_pass_through_datatype_commit(void *obj, const H5VL_loc_params_t *loc_params
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     void *under;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL DATATYPE Commit\n");
 #endif
 
@@ -1261,7 +1272,7 @@ H5VL_pass_through_datatype_commit(void *obj, const H5VL_loc_params_t *loc_params
     else
         dt = NULL;
 
-    return((void *)dt);
+    return (void *)dt;
 } /* end H5VL_pass_through_datatype_commit() */
 
 
@@ -1283,7 +1294,7 @@ H5VL_pass_through_datatype_open(void *obj, const H5VL_loc_params_t *loc_params,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;  
     void *under;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL DATATYPE Open\n");
 #endif
 
@@ -1298,17 +1309,17 @@ H5VL_pass_through_datatype_open(void *obj, const H5VL_loc_params_t *loc_params,
     else
         dt = NULL;
 
-    return((void *)dt);
+    return (void *)dt;
 } /* end H5VL_pass_through_datatype_open() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_datatype_get
+ * Function:    H5VL_pass_through_datatype_get
  *
- * Purpose:	Get information about a datatype
+ * Purpose:     Get information about a datatype
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -1319,7 +1330,7 @@ H5VL_pass_through_datatype_get(void *dt, H5VL_datatype_get_t get_type,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)dt;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL DATATYPE Get\n");
 #endif
 
@@ -1329,7 +1340,7 @@ H5VL_pass_through_datatype_get(void *dt, H5VL_datatype_get_t get_type,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_datatype_get() */
 
 
@@ -1338,8 +1349,8 @@ H5VL_pass_through_datatype_get(void *dt, H5VL_datatype_get_t get_type,
  *
  * Purpose:     Specific operations for datatypes
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -1350,7 +1361,7 @@ H5VL_pass_through_datatype_specific(void *obj, H5VL_datatype_specific_t specific
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL DATATYPE Specific\n");
 #endif
 
@@ -1360,7 +1371,7 @@ H5VL_pass_through_datatype_specific(void *obj, H5VL_datatype_specific_t specific
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_datatype_specific() */
 
 
@@ -1369,8 +1380,8 @@ H5VL_pass_through_datatype_specific(void *obj, H5VL_datatype_specific_t specific
  *
  * Purpose:     Perform a connector-specific operation on a datatype
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -1381,7 +1392,7 @@ H5VL_pass_through_datatype_optional(void *obj, hid_t dxpl_id, void **req,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL DATATYPE Optional\n");
 #endif
 
@@ -1391,17 +1402,17 @@ H5VL_pass_through_datatype_optional(void *obj, hid_t dxpl_id, void **req,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_datatype_optional() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_datatype_close
+ * Function:    H5VL_pass_through_datatype_close
  *
- * Purpose:	Closes a datatype.
+ * Purpose:     Closes a datatype.
  *
- * Return:	Success:	0
- *		Failure:	-1, datatype not closed.
+ * Return:      Success:    0
+ *              Failure:    -1, datatype not closed.
  *
  *-------------------------------------------------------------------------
  */
@@ -1411,7 +1422,7 @@ H5VL_pass_through_datatype_close(void *dt, hid_t dxpl_id, void **req)
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)dt;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL DATATYPE Close\n");
 #endif
 
@@ -1427,7 +1438,7 @@ H5VL_pass_through_datatype_close(void *dt, hid_t dxpl_id, void **req)
     if(ret_value >= 0)
         H5VL_pass_through_free_obj(o);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_datatype_close() */
 
 
@@ -1450,7 +1461,7 @@ H5VL_pass_through_file_create(const char *name, unsigned flags, hid_t fcpl_id,
     hid_t under_fapl_id;
     void *under;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL FILE Create\n");
 #endif
 
@@ -1481,7 +1492,7 @@ H5VL_pass_through_file_create(const char *name, unsigned flags, hid_t fcpl_id,
     /* Release copy of our VOL info */
     H5VL_pass_through_info_free(info);
 
-    return((void *)file);
+    return (void *)file;
 } /* end H5VL_pass_through_file_create() */
 
 
@@ -1504,7 +1515,7 @@ H5VL_pass_through_file_open(const char *name, unsigned flags, hid_t fapl_id,
     hid_t under_fapl_id;
     void *under;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL FILE Open\n");
 #endif
 
@@ -1535,7 +1546,7 @@ H5VL_pass_through_file_open(const char *name, unsigned flags, hid_t fapl_id,
     /* Release copy of our VOL info */
     H5VL_pass_through_info_free(info);
 
-    return((void *)file);
+    return (void *)file;
 } /* end H5VL_pass_through_file_open() */
 
 
@@ -1544,8 +1555,8 @@ H5VL_pass_through_file_open(const char *name, unsigned flags, hid_t fapl_id,
  *
  * Purpose:     Get info about a file
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -1556,7 +1567,7 @@ H5VL_pass_through_file_get(void *file, H5VL_file_get_t get_type, hid_t dxpl_id,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)file;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL FILE Get\n");
 #endif
 
@@ -1566,18 +1577,18 @@ H5VL_pass_through_file_get(void *file, H5VL_file_get_t get_type, hid_t dxpl_id,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_file_get() */
 
 
 /*-------------------------------------------------------------------------
  * Function:    H5VL_pass_through_file_specific_reissue
  *
- * Purpose:	Re-wrap vararg arguments into a va_list and reissue the
- *		file specific callback to the underlying VOL connector.
+ * Purpose:     Re-wrap vararg arguments into a va_list and reissue the
+ *              file specific callback to the underlying VOL connector.
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -1592,17 +1603,17 @@ H5VL_pass_through_file_specific_reissue(void *obj, hid_t connector_id,
     ret_value = H5VLfile_specific(obj, connector_id, specific_type, dxpl_id, req, arguments);
     va_end(arguments);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_file_specific_reissue() */
 
 
 /*-------------------------------------------------------------------------
  * Function:    H5VL_pass_through_file_specific
  *
- * Purpose:	Specific operation on file
+ * Purpose:     Specific operation on file
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -1614,7 +1625,7 @@ H5VL_pass_through_file_specific(void *file, H5VL_file_specific_t specific_type,
     hid_t under_vol_id = -1;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL FILE Specific\n");
 #endif
 
@@ -1626,7 +1637,7 @@ H5VL_pass_through_file_specific(void *file, H5VL_file_specific_t specific_type,
         hid_t plist_id;
 
         /* Retrieve parameters for 'mount' operation, so we can unwrap the child file */
-        loc_type = va_arg(arguments, H5I_type_t);
+        loc_type = (H5I_type_t)va_arg(arguments, int); /* enum work-around */
         name = va_arg(arguments, const char *);
         child_file = (H5VL_pass_through_t *)va_arg(arguments, void *);
         plist_id = va_arg(arguments, hid_t);
@@ -1635,7 +1646,7 @@ H5VL_pass_through_file_specific(void *file, H5VL_file_specific_t specific_type,
         under_vol_id = o->under_vol_id;
 
         /* Re-issue 'file specific' call, using the unwrapped pieces */
-        ret_value = H5VL_pass_through_file_specific_reissue(o->under_object, o->under_vol_id, specific_type, dxpl_id, req, loc_type, name, child_file->under_object, plist_id);
+        ret_value = H5VL_pass_through_file_specific_reissue(o->under_object, o->under_vol_id, specific_type, dxpl_id, req, (int)loc_type, name, child_file->under_object, plist_id);
     } /* end if */
     else if(specific_type == H5VL_FILE_IS_ACCESSIBLE) {
         H5VL_pass_through_info_t *info;
@@ -1699,7 +1710,7 @@ H5VL_pass_through_file_specific(void *file, H5VL_file_specific_t specific_type,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_file_specific() */
 
 
@@ -1708,8 +1719,8 @@ H5VL_pass_through_file_specific(void *file, H5VL_file_specific_t specific_type,
  *
  * Purpose:     Perform a connector-specific operation on a file
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -1720,7 +1731,7 @@ H5VL_pass_through_file_optional(void *file, hid_t dxpl_id, void **req,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)file;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL File Optional\n");
 #endif
 
@@ -1730,7 +1741,7 @@ H5VL_pass_through_file_optional(void *file, hid_t dxpl_id, void **req,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_file_optional() */
 
 
@@ -1739,8 +1750,8 @@ H5VL_pass_through_file_optional(void *file, hid_t dxpl_id, void **req,
  *
  * Purpose:     Closes a file.
  *
- * Return:	Success:	0
- *		Failure:	-1, file not closed.
+ * Return:      Success:    0
+ *              Failure:    -1, file not closed.
  *
  *-------------------------------------------------------------------------
  */
@@ -1750,7 +1761,7 @@ H5VL_pass_through_file_close(void *file, hid_t dxpl_id, void **req)
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)file;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL FILE Close\n");
 #endif
 
@@ -1764,7 +1775,7 @@ H5VL_pass_through_file_close(void *file, hid_t dxpl_id, void **req)
     if(ret_value >= 0)
         H5VL_pass_through_free_obj(o);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_file_close() */
 
 
@@ -1786,7 +1797,7 @@ H5VL_pass_through_group_create(void *obj, const H5VL_loc_params_t *loc_params,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     void *under;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL GROUP Create\n");
 #endif
 
@@ -1801,7 +1812,7 @@ H5VL_pass_through_group_create(void *obj, const H5VL_loc_params_t *loc_params,
     else
         group = NULL;
 
-    return((void *)group);
+    return (void *)group;
 } /* end H5VL_pass_through_group_create() */
 
 
@@ -1823,7 +1834,7 @@ H5VL_pass_through_group_open(void *obj, const H5VL_loc_params_t *loc_params,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     void *under;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL GROUP Open\n");
 #endif
 
@@ -1838,7 +1849,7 @@ H5VL_pass_through_group_open(void *obj, const H5VL_loc_params_t *loc_params,
     else
         group = NULL;
 
-    return((void *)group);
+    return (void *)group;
 } /* end H5VL_pass_through_group_open() */
 
 
@@ -1847,8 +1858,8 @@ H5VL_pass_through_group_open(void *obj, const H5VL_loc_params_t *loc_params,
  *
  * Purpose:     Get info about a group
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -1859,7 +1870,7 @@ H5VL_pass_through_group_get(void *obj, H5VL_group_get_t get_type, hid_t dxpl_id,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL GROUP Get\n");
 #endif
 
@@ -1869,17 +1880,17 @@ H5VL_pass_through_group_get(void *obj, H5VL_group_get_t get_type, hid_t dxpl_id,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_group_get() */
 
 
 /*-------------------------------------------------------------------------
  * Function:    H5VL_pass_through_group_specific
  *
- * Purpose:	Specific operation on a group
+ * Purpose:     Specific operation on a group
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -1890,7 +1901,7 @@ H5VL_pass_through_group_specific(void *obj, H5VL_group_specific_t specific_type,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL GROUP Specific\n");
 #endif
 
@@ -1900,7 +1911,7 @@ H5VL_pass_through_group_specific(void *obj, H5VL_group_specific_t specific_type,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_group_specific() */
 
 
@@ -1909,8 +1920,8 @@ H5VL_pass_through_group_specific(void *obj, H5VL_group_specific_t specific_type,
  *
  * Purpose:     Perform a connector-specific operation on a group
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -1921,7 +1932,7 @@ H5VL_pass_through_group_optional(void *obj, hid_t dxpl_id, void **req,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL GROUP Optional\n");
 #endif
 
@@ -1931,7 +1942,7 @@ H5VL_pass_through_group_optional(void *obj, hid_t dxpl_id, void **req,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_group_optional() */
 
 
@@ -1940,8 +1951,8 @@ H5VL_pass_through_group_optional(void *obj, hid_t dxpl_id, void **req,
  *
  * Purpose:     Closes a group.
  *
- * Return:	Success:	0
- *		Failure:	-1, group not closed.
+ * Return:      Success:    0
+ *              Failure:    -1, group not closed.
  *
  *-------------------------------------------------------------------------
  */
@@ -1951,7 +1962,7 @@ H5VL_pass_through_group_close(void *grp, hid_t dxpl_id, void **req)
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)grp;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL H5Gclose\n");
 #endif
 
@@ -1965,17 +1976,17 @@ H5VL_pass_through_group_close(void *grp, hid_t dxpl_id, void **req)
     if(ret_value >= 0)
         H5VL_pass_through_free_obj(o);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_group_close() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_link_create
+ * Function:    H5VL_pass_through_link_create
  *
- * Purpose:	Creates a hard / soft / UD / external link.
+ * Purpose:     Creates a hard / soft / UD / external link.
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -1986,7 +1997,7 @@ H5VL_pass_through_link_create(H5VL_link_create_type_t create_type, void *obj, co
     hid_t under_vol_id = -1;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL LINK Create\n");
 #endif
 
@@ -2018,22 +2029,22 @@ H5VL_pass_through_link_create(H5VL_link_create_type_t create_type, void *obj, co
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_link_create() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_link_copy
+ * Function:    H5VL_pass_through_link_copy
  *
- * Purpose:	Renames an object within an HDF5 container and copies it to a new
+ * Purpose:     Renames an object within an HDF5 container and copies it to a new
  *              group.  The original name SRC is unlinked from the group graph
  *              and then inserted with the new name DST (which can specify a
  *              new path for the object) as an atomic operation. The names
  *              are interpreted relative to SRC_LOC_ID and
  *              DST_LOC_ID, which are either file IDs or group ID.
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -2047,7 +2058,7 @@ H5VL_pass_through_link_copy(void *src_obj, const H5VL_loc_params_t *loc_params1,
     hid_t under_vol_id = -1;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL LINK Copy\n");
 #endif
 
@@ -2064,23 +2075,22 @@ H5VL_pass_through_link_copy(void *src_obj, const H5VL_loc_params_t *loc_params1,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, under_vol_id);
             
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_link_copy() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	
-H5VL_pass_through_link_move(void *src_obj, const H5VL_loc_params_t *loc_params1,
+ * Function:    H5VL_pass_through_link_move
  *
- * Purpose:	Moves a link within an HDF5 file to a new group.  The original
- *		name SRC is unlinked from the group graph
+ * Purpose:     Moves a link within an HDF5 file to a new group.  The original
+ *              name SRC is unlinked from the group graph
  *              and then inserted with the new name DST (which can specify a
  *              new path for the object) as an atomic operation. The names
  *              are interpreted relative to SRC_LOC_ID and
  *              DST_LOC_ID, which are either file IDs or group ID.
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -2094,7 +2104,7 @@ H5VL_pass_through_link_move(void *src_obj, const H5VL_loc_params_t *loc_params1,
     hid_t under_vol_id = -1;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL LINK Move\n");
 #endif
 
@@ -2111,17 +2121,17 @@ H5VL_pass_through_link_move(void *src_obj, const H5VL_loc_params_t *loc_params1,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_link_move() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_link_get
+ * Function:    H5VL_pass_through_link_get
  *
- * Purpose:	Get info about a link
+ * Purpose:     Get info about a link
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -2132,7 +2142,7 @@ H5VL_pass_through_link_get(void *obj, const H5VL_loc_params_t *loc_params,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL LINK Get\n");
 #endif
 
@@ -2142,17 +2152,17 @@ H5VL_pass_through_link_get(void *obj, const H5VL_loc_params_t *loc_params,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
             
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_link_get() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_link_specific
+ * Function:    H5VL_pass_through_link_specific
  *
- * Purpose:	Specific operation on a link
+ * Purpose:     Specific operation on a link
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -2163,7 +2173,7 @@ H5VL_pass_through_link_specific(void *obj, const H5VL_loc_params_t *loc_params,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL LINK Specific\n");
 #endif
 
@@ -2173,7 +2183,7 @@ H5VL_pass_through_link_specific(void *obj, const H5VL_loc_params_t *loc_params,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_link_specific() */
 
 
@@ -2182,8 +2192,8 @@ H5VL_pass_through_link_specific(void *obj, const H5VL_loc_params_t *loc_params,
  *
  * Purpose:     Perform a connector-specific operation on a link
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -2194,7 +2204,7 @@ H5VL_pass_through_link_optional(void *obj, hid_t dxpl_id, void **req,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL LINK Optional\n");
 #endif
 
@@ -2204,17 +2214,17 @@ H5VL_pass_through_link_optional(void *obj, hid_t dxpl_id, void **req,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_link_optional() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_object_open
+ * Function:    H5VL_pass_through_object_open
  *
- * Purpose:	Opens an object inside a container.
+ * Purpose:     Opens an object inside a container.
  *
- * Return:	Success:	Pointer to object
- *		Failure:	NULL
+ * Return:      Success:    Pointer to object
+ *              Failure:    NULL
  *
  *-------------------------------------------------------------------------
  */
@@ -2226,7 +2236,7 @@ H5VL_pass_through_object_open(void *obj, const H5VL_loc_params_t *loc_params,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     void *under;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL OBJECT Open\n");
 #endif
 
@@ -2241,17 +2251,17 @@ H5VL_pass_through_object_open(void *obj, const H5VL_loc_params_t *loc_params,
     else
         new_obj = NULL;
 
-    return((void *)new_obj);
+    return (void *)new_obj;
 } /* end H5VL_pass_through_object_open() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_object_copy
+ * Function:    H5VL_pass_through_object_copy
  *
- * Purpose:	Copies an object inside a container.
+ * Purpose:     Copies an object inside a container.
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -2265,7 +2275,7 @@ H5VL_pass_through_object_copy(void *src_obj, const H5VL_loc_params_t *src_loc_pa
     H5VL_pass_through_t *o_dst = (H5VL_pass_through_t *)dst_obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL OBJECT Copy\n");
 #endif
 
@@ -2275,17 +2285,17 @@ H5VL_pass_through_object_copy(void *src_obj, const H5VL_loc_params_t *src_loc_pa
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o_src->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_object_copy() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_object_get
+ * Function:    H5VL_pass_through_object_get
  *
- * Purpose:	Get info about an object
+ * Purpose:     Get info about an object
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -2295,7 +2305,7 @@ H5VL_pass_through_object_get(void *obj, const H5VL_loc_params_t *loc_params, H5V
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL OBJECT Get\n");
 #endif
 
@@ -2305,17 +2315,17 @@ H5VL_pass_through_object_get(void *obj, const H5VL_loc_params_t *loc_params, H5V
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_object_get() */
 
 
 /*-------------------------------------------------------------------------
  * Function:    H5VL_pass_through_object_specific
  *
- * Purpose:	Specific operation on an object
+ * Purpose:     Specific operation on an object
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -2327,7 +2337,7 @@ H5VL_pass_through_object_specific(void *obj, const H5VL_loc_params_t *loc_params
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL OBJECT Specific\n");
 #endif
 
@@ -2337,17 +2347,17 @@ H5VL_pass_through_object_specific(void *obj, const H5VL_loc_params_t *loc_params
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_object_specific() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_object_optional
+ * Function:    H5VL_pass_through_object_optional
  *
- * Purpose:	Perform a connector-specific operation for an object
+ * Purpose:     Perform a connector-specific operation for an object
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -2358,7 +2368,7 @@ H5VL_pass_through_object_optional(void *obj, hid_t dxpl_id, void **req,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL OBJECT Optional\n");
 #endif
 
@@ -2368,20 +2378,20 @@ H5VL_pass_through_object_optional(void *obj, hid_t dxpl_id, void **req,
     if(req && *req)
         *req = H5VL_pass_through_new_obj(*req, o->under_vol_id);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_object_optional() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_request_wait
+ * Function:    H5VL_pass_through_request_wait
  *
- * Purpose:	Wait (with a timeout) for an async operation to complete
+ * Purpose:     Wait (with a timeout) for an async operation to complete
  *
- * Note:	Releases the request if the operation has completed and the
- *		connector callback succeeds
+ * Note:        Releases the request if the operation has completed and the
+ *              connector callback succeeds
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -2392,7 +2402,7 @@ H5VL_pass_through_request_wait(void *obj, uint64_t timeout,
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL REQUEST Wait\n");
 #endif
 
@@ -2401,20 +2411,20 @@ H5VL_pass_through_request_wait(void *obj, uint64_t timeout,
     if(ret_value >= 0 && *status != H5ES_STATUS_IN_PROGRESS)
         H5VL_pass_through_free_obj(o);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_request_wait() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_request_notify
+ * Function:    H5VL_pass_through_request_notify
  *
  * Purpose:     Registers a user callback to be invoked when an asynchronous
- *		operation completes
+ *              operation completes
  *
- * Note:	Releases the request, if connector callback succeeds
+ * Note:        Releases the request, if connector callback succeeds
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -2424,7 +2434,7 @@ H5VL_pass_through_request_notify(void *obj, H5VL_request_notify_t cb, void *ctx)
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL REQUEST Wait\n");
 #endif
 
@@ -2433,19 +2443,19 @@ H5VL_pass_through_request_notify(void *obj, H5VL_request_notify_t cb, void *ctx)
     if(ret_value >= 0)
         H5VL_pass_through_free_obj(o);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_request_notify() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_request_cancel
+ * Function:    H5VL_pass_through_request_cancel
  *
  * Purpose:     Cancels an asynchronous operation
  *
- * Note:	Releases the request, if connector callback succeeds
+ * Note:        Releases the request, if connector callback succeeds
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -2455,7 +2465,7 @@ H5VL_pass_through_request_cancel(void *obj)
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL REQUEST Cancel\n");
 #endif
 
@@ -2464,18 +2474,18 @@ H5VL_pass_through_request_cancel(void *obj)
     if(ret_value >= 0)
         H5VL_pass_through_free_obj(o);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_request_cancel() */
 
 
 /*-------------------------------------------------------------------------
  * Function:    H5VL_pass_through_request_specific_reissue
  *
- * Purpose:	Re-wrap vararg arguments into a va_list and reissue the
- *		request specific callback to the underlying VOL connector.
+ * Purpose:     Re-wrap vararg arguments into a va_list and reissue the
+ *              request specific callback to the underlying VOL connector.
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -2490,17 +2500,17 @@ H5VL_pass_through_request_specific_reissue(void *obj, hid_t connector_id,
     ret_value = H5VLrequest_specific(obj, connector_id, specific_type, arguments);
     va_end(arguments);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_request_specific_reissue() */
 
 
 /*-------------------------------------------------------------------------
  * Function:    H5VL_pass_through_request_specific
  *
- * Purpose:	Specific operation on a request
+ * Purpose:     Specific operation on a request
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -2510,7 +2520,7 @@ H5VL_pass_through_request_specific(void *obj, H5VL_request_specific_t specific_t
 {
     herr_t ret_value = -1;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL REQUEST Specific\n");
 #endif
 
@@ -2632,17 +2642,17 @@ H5VL_pass_through_request_specific(void *obj, H5VL_request_specific_t specific_t
     else
         assert(0 && "Unknown 'specific' operation");
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_request_specific() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_request_optional
+ * Function:    H5VL_pass_through_request_optional
  *
- * Purpose:	Perform a connector-specific operation for a request
+ * Purpose:     Perform a connector-specific operation for a request
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -2652,24 +2662,24 @@ H5VL_pass_through_request_optional(void *obj, va_list arguments)
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL REQUEST Optional\n");
 #endif
 
     ret_value = H5VLrequest_optional(o->under_object, o->under_vol_id, arguments);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_request_optional() */
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5VL_pass_through_request_free
+ * Function:    H5VL_pass_through_request_free
  *
  * Purpose:     Releases a request, allowing the operation to complete without
- *		application tracking
+ *              application tracking
  *
- * Return:	Success:	0
- *		Failure:	-1
+ * Return:      Success:    0
+ *              Failure:    -1
  *
  *-------------------------------------------------------------------------
  */
@@ -2679,7 +2689,7 @@ H5VL_pass_through_request_free(void *obj)
     H5VL_pass_through_t *o = (H5VL_pass_through_t *)obj;
     herr_t ret_value;
 
-#ifdef ENABLE_LOGGING 
+#ifdef ENABLE_PASSTHRU_LOGGING 
     printf("------- PASS THROUGH VOL REQUEST Free\n");
 #endif
 
@@ -2688,6 +2698,6 @@ H5VL_pass_through_request_free(void *obj)
     if(ret_value >= 0)
         H5VL_pass_through_free_obj(o);
 
-    return(ret_value);
+    return ret_value;
 } /* end H5VL_pass_through_request_free() */
 
diff --git a/src/H5VLpublic.h b/src/H5VLpublic.h
index b276128..dd1ed54 100644
--- a/src/H5VLpublic.h
+++ b/src/H5VLpublic.h
@@ -115,7 +115,7 @@ typedef enum H5VL_file_get_t {
     H5VL_FILE_GET_INTENT,	            /* file intent           		*/
     H5VL_FILE_GET_NAME,	                    /* file name             		*/
     H5VL_FILE_GET_OBJ_COUNT,	            /* object count in file	       	*/
-    H5VL_FILE_GET_OBJ_IDS 	            /* object ids in file     		*/
+    H5VL_FILE_GET_OBJ_IDS	            /* object ids in file     		*/
 } H5VL_file_get_t;
 
 /* types for file SPECIFIC callback */
@@ -124,8 +124,7 @@ typedef enum H5VL_file_specific_t {
     H5VL_FILE_REOPEN,                       /* Reopen the file                  */
     H5VL_FILE_MOUNT,                        /* Mount a file                     */
     H5VL_FILE_UNMOUNT,                      /* Unmount a file                   */
-    H5VL_FILE_IS_ACCESSIBLE,                /* Check if a file is accessible    */
-    H5VL_FILE_CACHE_VOL_CONN                /* Cache VOL connector ID & info    */
+    H5VL_FILE_IS_ACCESSIBLE                 /* Check if a file is accessible    */
 } H5VL_file_specific_t;
 
 /* types for group GET callback */
@@ -434,6 +433,8 @@ H5_DLL herr_t H5VLunregister_connector(hid_t connector_id);
 
 /* Helper routines for VOL connector authors */
 H5_DLL herr_t H5VLcmp_connector_cls(int *cmp, hid_t connector_id1, hid_t connector_id2);
+H5_DLL hid_t H5VLwrap_register(void *obj, H5I_type_t type);
+H5_DLL void *H5VLobject(hid_t obj_id);
 
 
 /* Public wrappers for generic callbacks */
diff --git a/src/H5VM.c b/src/H5VM.c
index 4c0b837..452d378 100644
--- a/src/H5VM.c
+++ b/src/H5VM.c
@@ -1548,7 +1548,7 @@ done:
  *
  * Purpose:	Given source and destination buffers in memory (SRC & DST)
  *              copy sequences of from the source buffer into the destination
- *              buffer.  Each set of sequnces has an array of lengths, an
+ *              buffer.  Each set of sequences has an array of lengths, an
  *              array of offsets, the maximum number of sequences and the
  *              current sequence to start at in the sequence.
  *
diff --git a/src/H5err.txt b/src/H5err.txt
index 3965242..93a3abd 100644
--- a/src/H5err.txt
+++ b/src/H5err.txt
@@ -181,7 +181,7 @@ MINOR, CACHE, H5E_CANTRESIZE, Unable to resize a metadata cache entry
 MINOR, CACHE, H5E_CANTDEPEND, Unable to create a flush dependency
 MINOR, CACHE, H5E_CANTUNDEPEND, Unable to destroy a flush dependency
 MINOR, CACHE, H5E_CANTNOTIFY, Unable to notify object about action
-MINOR, CACHE, H5E_LOGFAIL, Failure in the cache logging framework
+MINOR, CACHE, H5E_LOGGING, Failure in the cache logging framework
 MINOR, CACHE, H5E_CANTCORK, Unable to cork an object
 MINOR, CACHE, H5E_CANTUNCORK, Unable to uncork an object
 
diff --git a/src/H5private.h b/src/H5private.h
index b654bae..f58faec 100644
--- a/src/H5private.h
+++ b/src/H5private.h
@@ -1393,6 +1393,9 @@ typedef off_t               h5_stat_size_t;
 #ifndef HDstrtok
     #define HDstrtok(X,Y)    strtok(X,Y)
 #endif /* HDstrtok */
+#ifndef HDstrtok_r
+    #define HDstrtok_r(X,Y,Z) strtok_r(X,Y,Z)
+#endif /* HDstrtok */
 #ifndef HDstrtol
     #define HDstrtol(S,R,N)    strtol(S,R,N)
 #endif /* HDstrtol */
@@ -1495,6 +1498,9 @@ typedef off_t               h5_stat_size_t;
 #ifndef HDva_arg
     #define HDva_arg(A,T)    va_arg(A,T)
 #endif /* HDva_arg */
+#ifndef HDva_copy
+#define HDva_copy(D,S)    va_copy(D,S)
+#endif /* HDva_copy */
 #ifndef HDva_end
     #define HDva_end(A)    va_end(A)
 #endif /* HDva_end */
diff --git a/src/H5system.c b/src/H5system.c
index 2d29650..f47d057 100644
--- a/src/H5system.c
+++ b/src/H5system.c
@@ -121,7 +121,7 @@ HDfprintf(FILE *stream, const char *fmt, ...)
     HDassert(stream);
     HDassert(fmt);
 
-    va_start (ap, fmt);
+    HDva_start (ap, fmt);
     while (*fmt) {
         fwidth = prec = 0;
         zerofill = 0;
@@ -170,7 +170,7 @@ HDfprintf(FILE *stream, const char *fmt, ...)
                 s = rest;
             } /* end if */
             else if ('*'==*s) {
-                fwidth = va_arg(ap, int);
+                fwidth = HDva_arg(ap, int);
                 if(fwidth < 0) {
                     leftjust = 1;
                     fwidth = -fwidth;
@@ -185,7 +185,7 @@ HDfprintf(FILE *stream, const char *fmt, ...)
                     prec = (int)HDstrtol(s, &rest, 10);
                     s = rest;
                 } else if('*'==*s) {
-                    prec = va_arg(ap, int);
+                    prec = HDva_arg(ap, int);
                     s++;
                 }
                 if(prec < 1)
@@ -272,16 +272,16 @@ HDfprintf(FILE *stream, const char *fmt, ...)
                 case 'd':
                 case 'i':
                     if(!HDstrcmp(modifier, "h")) {
-                        short x = (short)va_arg(ap, int);
+                        short x = (short)HDva_arg(ap, int);
                         n = fprintf(stream, format_templ, x);
                     } else if(!*modifier) {
-                        int x = va_arg(ap, int);
+                        int x = HDva_arg(ap, int);
                         n = fprintf(stream, format_templ, x);
                     } else if(!HDstrcmp(modifier, "l")) {
-                        long x = va_arg(ap, long);
+                        long x = HDva_arg(ap, long);
                         n = fprintf(stream, format_templ, x);
                     } else {
-                        int64_t x = va_arg(ap, int64_t);
+                        int64_t x = HDva_arg(ap, int64_t);
                         n = fprintf(stream, format_templ, x);
                     }
                     break;
@@ -291,16 +291,16 @@ HDfprintf(FILE *stream, const char *fmt, ...)
                 case 'x':
                 case 'X':
                     if(!HDstrcmp(modifier, "h")) {
-                        unsigned short x = (unsigned short)va_arg(ap, unsigned int);
+                        unsigned short x = (unsigned short)HDva_arg(ap, unsigned int);
                         n = fprintf(stream, format_templ, x);
                     } else if(!*modifier) {
-                        unsigned int x = va_arg(ap, unsigned int);
+                        unsigned int x = HDva_arg(ap, unsigned int);
                         n = fprintf(stream, format_templ, x);
                     } else if(!HDstrcmp(modifier, "l")) {
-                        unsigned long x = va_arg(ap, unsigned long);
+                        unsigned long x = HDva_arg(ap, unsigned long);
                         n = fprintf(stream, format_templ, x);
                     } else {
-                        uint64_t x = va_arg(ap, uint64_t);
+                        uint64_t x = HDva_arg(ap, uint64_t);
                         n = fprintf(stream, format_templ, x);
                     }
                     break;
@@ -311,10 +311,10 @@ HDfprintf(FILE *stream, const char *fmt, ...)
                 case 'g':
                 case 'G':
                     if(!HDstrcmp(modifier, "h")) {
-                        float x = (float)va_arg(ap, double);
+                        float x = (float)HDva_arg(ap, double);
                         n = fprintf(stream, format_templ, (double)x);
                     } else if(!*modifier || !HDstrcmp(modifier, "l")) {
-                        double x = va_arg(ap, double);
+                        double x = HDva_arg(ap, double);
                         n = fprintf(stream, format_templ, x);
                     } else {
                     /*
@@ -322,10 +322,10 @@ HDfprintf(FILE *stream, const char *fmt, ...)
                     * `double' are the same thing.
                     */
 #if H5_SIZEOF_LONG_DOUBLE != H5_SIZEOF_DOUBLE
-                        long double x = va_arg(ap, long double);
+                        long double x = HDva_arg(ap, long double);
                         n = fprintf(stream, format_templ, x);
 #else
-                        double x = va_arg(ap, double);
+                        double x = HDva_arg(ap, double);
                         n = fprintf(stream, format_templ, x);
 #endif
                     }
@@ -333,7 +333,7 @@ HDfprintf(FILE *stream, const char *fmt, ...)
 
                 case 'a':
                     {
-                        haddr_t x = va_arg(ap, haddr_t);
+                        haddr_t x = HDva_arg(ap, haddr_t);
 
                         if(H5F_addr_defined(x)) {
                             len = 0;
@@ -379,7 +379,7 @@ HDfprintf(FILE *stream, const char *fmt, ...)
 
                 case 'c':
                     {
-                        char x = (char)va_arg(ap, int);
+                        char x = (char)HDva_arg(ap, int);
                         n = fprintf(stream, format_templ, x);
                     }
                     break;
@@ -387,7 +387,7 @@ HDfprintf(FILE *stream, const char *fmt, ...)
                 case 's':
                 case 'p':
                     {
-                        char *x = va_arg(ap, char*);
+                        char *x = HDva_arg(ap, char*);
                         n = fprintf(stream, format_templ, x);
                     }
                     break;
@@ -399,7 +399,7 @@ HDfprintf(FILE *stream, const char *fmt, ...)
 
                 case 't':
                     {
-                        htri_t tri_var = va_arg(ap, htri_t);
+                        htri_t tri_var = HDva_arg(ap, htri_t);
 
                         if(tri_var > 0)
                             fprintf(stream, "TRUE");
@@ -423,7 +423,7 @@ HDfprintf(FILE *stream, const char *fmt, ...)
             nout++;
         }
     }
-    va_end(ap);
+    HDva_end(ap);
     return nout;
 } /* end HDfprintf() */
 
@@ -492,7 +492,8 @@ HDstrtoll(const char *s, const char **rest, int base)
     /* Optional minus or plus sign */
     if ('+'==*s) {
         s++;
-    } else if ('-'==*s) {
+    }
+    else if ('-'==*s) {
         sign = -1;
         s++;
     }
@@ -501,10 +502,12 @@ HDstrtoll(const char *s, const char **rest, int base)
     if (0==base && '0'==*s && ('x'==s[1] || 'X'==s[1])) {
         base = 16;
         s += 2;
-    } else if (0==base && '0'==*s) {
+    }
+    else if (0==base && '0'==*s) {
         base = 8;
         s++;
-    } else if (0==base) {
+    }
+    else if (0==base) {
         base = 10;
     }
 
@@ -525,7 +528,8 @@ HDstrtoll(const char *s, const char **rest, int base)
 
             if (acc*base+digit < acc) {
                 overflow = TRUE;
-            } else {
+            }
+            else {
                 acc = acc*base + digit;
             }
         }
@@ -536,7 +540,8 @@ HDstrtoll(const char *s, const char **rest, int base)
     if (overflow) {
         if (sign>0) {
             acc = ((uint64_t)1<<(8*sizeof(int64_t)-1))-1;
-        } else {
+        }
+        else {
             acc = (int64_t)((uint64_t)1<<(8*sizeof(int64_t)-1));
         }
         errno = ERANGE;
@@ -843,9 +848,9 @@ int c99_snprintf(char* str, size_t size, const char* format, ...)
     int count;
     va_list ap;
 
-    va_start(ap, format);
+    HDva_start(ap, format);
     count = c99_vsnprintf(str, size, format, ap);
-    va_end(ap);
+    HDva_end(ap);
 
     return count;
 }
diff --git a/src/H5trace.c b/src/H5trace.c
index d5aad06..9a13193 100644
--- a/src/H5trace.c
+++ b/src/H5trace.c
@@ -135,7 +135,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
 
     if(!out)
         return 0.0F;	/*tracing is off*/
-    va_start(ap, type);
+    HDva_start(ap, type);
 
     if(H5_debug_g.ttop) {
         if(returning) {
@@ -227,7 +227,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
          * name is the null pointer then don't print the argument or the
          * following `='.  This is used for return values.
          */
-        argname = va_arg(ap, char *);
+        argname = HDva_arg(ap, char *);
         if(argname) {
             unsigned n = (unsigned)MAX (0, (int)HDstrlen(argname) - 3);
 
@@ -243,7 +243,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
 
         /* The value */
         if(ptr)
-            vp = va_arg(ap, void *);
+            vp = HDva_arg(ap, void *);
         switch(type[0]) {
             case 'a':
                 if(ptr) {
@@ -253,7 +253,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                         HDfprintf(out, "NULL");
                 } /* end if */
                 else {
-                    haddr_t addr = va_arg(ap, haddr_t);
+                    haddr_t addr = HDva_arg(ap, haddr_t);
 
                     HDfprintf(out, "%a", addr);
                 } /* end else */
@@ -267,8 +267,8 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                         HDfprintf(out, "NULL");
                     } /* end if */
                 else {
-                    /* Can't pass hbool_t to va_arg() */
-                    hbool_t bool_var = (hbool_t)va_arg(ap, int);
+                    /* Can't pass hbool_t to HDva_arg() */
+                    hbool_t bool_var = (hbool_t)HDva_arg(ap, int);
                     if(TRUE == bool_var)
                         HDfprintf(out, "TRUE");
                     else if(!bool_var)
@@ -286,7 +286,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                         HDfprintf(out, "NULL");
                 } /* end if */
                 else {
-                    double dbl = va_arg(ap, double);
+                    double dbl = HDva_arg(ap, double);
 
                     HDfprintf(out, "%g", dbl);
                 } /* end else */
@@ -302,7 +302,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5D_alloc_time_t alloc_time = (H5D_alloc_time_t)va_arg(ap, int);
+                            H5D_alloc_time_t alloc_time = (H5D_alloc_time_t)HDva_arg(ap, int);
 
                             switch(alloc_time) {
                                 case H5D_ALLOC_TIME_ERROR:
@@ -340,7 +340,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5FD_mpio_collective_opt_t opt = (H5FD_mpio_collective_opt_t)va_arg(ap, int);
+                            H5FD_mpio_collective_opt_t opt = (H5FD_mpio_collective_opt_t)HDva_arg(ap, int);
 
                             switch(opt) {
                                 case H5FD_MPIO_COLLECTIVE_IO:
@@ -366,7 +366,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5D_fill_time_t fill_time = (H5D_fill_time_t)va_arg(ap, int);
+                            H5D_fill_time_t fill_time = (H5D_fill_time_t)HDva_arg(ap, int);
 
                             switch(fill_time) {
                                 case H5D_FILL_TIME_ERROR:
@@ -400,7 +400,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5D_fill_value_t fill_value = (H5D_fill_value_t)va_arg(ap, int);
+                            H5D_fill_value_t fill_value = (H5D_fill_value_t)HDva_arg(ap, int);
 
                             switch(fill_value) {
                                 case H5D_FILL_VALUE_ERROR:
@@ -434,7 +434,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5FD_mpio_chunk_opt_t opt = (H5FD_mpio_chunk_opt_t)va_arg(ap, int);
+                            H5FD_mpio_chunk_opt_t opt = (H5FD_mpio_chunk_opt_t)HDva_arg(ap, int);
 
                             switch(opt) {
                                 case H5FD_MPIO_CHUNK_DEFAULT:
@@ -464,7 +464,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5D_mpio_actual_io_mode_t actual_io_mode = (H5D_mpio_actual_io_mode_t)va_arg(ap, int);
+                            H5D_mpio_actual_io_mode_t actual_io_mode = (H5D_mpio_actual_io_mode_t)HDva_arg(ap, int);
 
                             switch(actual_io_mode) {
                                 case H5D_MPIO_NO_COLLECTIVE:
@@ -502,7 +502,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5D_chunk_index_t idx = (H5D_chunk_index_t)va_arg(ap, int);
+                            H5D_chunk_index_t idx = (H5D_chunk_index_t)HDva_arg(ap, int);
 
                             switch(idx) {
                                 case H5D_CHUNK_IDX_BTREE:
@@ -548,7 +548,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5D_layout_t layout = (H5D_layout_t)va_arg(ap, int);
+                            H5D_layout_t layout = (H5D_layout_t)HDva_arg(ap, int);
 
                             switch(layout) {
                                 case H5D_LAYOUT_ERROR:
@@ -590,7 +590,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5D_mpio_no_collective_cause_t nocol_cause_mode = (H5D_mpio_no_collective_cause_t)va_arg(ap, int);
+                            H5D_mpio_no_collective_cause_t nocol_cause_mode = (H5D_mpio_no_collective_cause_t)HDva_arg(ap, int);
                             hbool_t flag_already_displayed = FALSE;
 
                             /* Check for all bit-flags which might be set */
@@ -637,7 +637,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5D_mpio_actual_chunk_opt_mode_t chunk_opt_mode = (H5D_mpio_actual_chunk_opt_mode_t)va_arg(ap, int);
+                            H5D_mpio_actual_chunk_opt_mode_t chunk_opt_mode = (H5D_mpio_actual_chunk_opt_mode_t)HDva_arg(ap, int);
 
                             switch(chunk_opt_mode) {
                                 case H5D_MPIO_NO_CHUNK_OPTIMIZATION:
@@ -667,7 +667,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5D_space_status_t space_status = (H5D_space_status_t)va_arg(ap, int);
+                            H5D_space_status_t space_status = (H5D_space_status_t)HDva_arg(ap, int);
 
                             switch(space_status) {
                                 case H5D_SPACE_STATUS_NOT_ALLOCATED:
@@ -701,7 +701,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5FD_mpio_xfer_t transfer = (H5FD_mpio_xfer_t)va_arg(ap, int);
+                            H5FD_mpio_xfer_t transfer = (H5FD_mpio_xfer_t)HDva_arg(ap, int);
 
                             switch(transfer) {
                                 case H5FD_MPIO_INDEPENDENT:
@@ -727,7 +727,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5D_vds_view_t view = (H5D_vds_view_t)va_arg(ap, int);
+                            H5D_vds_view_t view = (H5D_vds_view_t)HDva_arg(ap, int);
 
                             switch(view) {
                                 case H5D_VDS_ERROR:
@@ -763,7 +763,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                        HDfprintf(out, "NULL");
                 } /* end if */
                 else {
-                    herr_t status = va_arg(ap, herr_t);
+                    herr_t status = HDva_arg(ap, herr_t);
 
                     if(status >= 0)
                        HDfprintf(out, "SUCCEED");
@@ -782,7 +782,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5E_direction_t direction = (H5E_direction_t)va_arg(ap, int);
+                            H5E_direction_t direction = (H5E_direction_t)HDva_arg(ap, int);
 
                             switch(direction) {
                                 case H5E_WALK_UPWARD:
@@ -808,7 +808,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5E_error2_t *error = va_arg(ap, H5E_error2_t *);
+                            H5E_error2_t *error = HDva_arg(ap, H5E_error2_t *);
 
                            HDfprintf(out, "0x%lx", (unsigned long)error);
                         } /* end else */
@@ -822,7 +822,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5ES_status_t status = (H5ES_status_t)va_arg(ap, int);
+                            H5ES_status_t status = (H5ES_status_t)HDva_arg(ap, int);
 
                             switch(status) {
                                 case H5ES_STATUS_IN_PROGRESS:
@@ -853,7 +853,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5E_type_t etype = (H5E_type_t)va_arg(ap, int);
+                            H5E_type_t etype = (H5E_type_t)HDva_arg(ap, int);
 
                             switch(etype) {
                                 case H5E_MAJOR:
@@ -887,7 +887,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5F_close_degree_t degree = (H5F_close_degree_t)va_arg(ap, int);
+                            H5F_close_degree_t degree = (H5F_close_degree_t)HDva_arg(ap, int);
 
                             switch(degree) {
                                 case H5F_CLOSE_DEFAULT:
@@ -921,7 +921,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5F_fspace_strategy_t fs_strategy = (H5F_fspace_strategy_t)va_arg(ap, int);
+                            H5F_fspace_strategy_t fs_strategy = (H5F_fspace_strategy_t)HDva_arg(ap, int);
 
                             switch(fs_strategy) {
                                 case H5F_FSPACE_STRATEGY_FSM_AGGR:
@@ -956,7 +956,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5F_mem_t mem_type = (H5F_mem_t)va_arg(ap, int);
+                            H5F_mem_t mem_type = (H5F_mem_t)HDva_arg(ap, int);
 
                             switch(mem_type) {
                                 case H5FD_MEM_NOLIST:
@@ -1007,7 +1007,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5F_scope_t scope = (H5F_scope_t)va_arg(ap, int);
+                            H5F_scope_t scope = (H5F_scope_t)HDva_arg(ap, int);
 
                             switch(scope) {
                                 case H5F_SCOPE_LOCAL:
@@ -1042,7 +1042,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5F_libver_t libver_vers = (H5F_libver_t)va_arg(ap, int);
+                            H5F_libver_t libver_vers = (H5F_libver_t)HDva_arg(ap, int);
 
                             switch(libver_vers) {
                                 case H5F_LIBVER_EARLIEST:
@@ -1084,7 +1084,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5G_obj_t obj_type = (H5G_obj_t)va_arg(ap, int);
+                            H5G_obj_t obj_type = (H5G_obj_t)HDva_arg(ap, int);
 
                             switch(obj_type) {
                                 case H5G_UNKNOWN:
@@ -1132,7 +1132,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5G_stat_t *statbuf = va_arg(ap, H5G_stat_t*);
+                            H5G_stat_t *statbuf = HDva_arg(ap, H5G_stat_t*);
 
                             HDfprintf(out, "0x%lx", (unsigned long)statbuf);
                         }
@@ -1166,7 +1166,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                         HDfprintf(out, "NULL");
                 } /* end if */
                 else {
-                    hsize_t hsize = va_arg(ap, hsize_t);
+                    hsize_t hsize = HDva_arg(ap, hsize_t);
 
                     if(H5S_UNLIMITED == hsize)
                         HDfprintf(out, "H5S_UNLIMITED");
@@ -1196,7 +1196,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            hssize_t hssize = va_arg(ap, hssize_t);
+                            hssize_t hssize = HDva_arg(ap, hssize_t);
 
                             HDfprintf(out, "%Hd", hssize);
                             asize[argno] = (hssize_t)hssize;
@@ -1217,7 +1217,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                         HDfprintf(out, "NULL");
                 } /* end if */
                 else {
-                    hid_t obj = va_arg(ap, hid_t);
+                    hid_t obj = HDva_arg(ap, hid_t);
 
                     if(H5P_DEFAULT == obj)
                         HDfprintf(out, "H5P_DEFAULT");
@@ -1355,10 +1355,6 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "%ld (attr)", (long)obj);
                                 break;
 
-                            case H5I_REFERENCE:
-                                HDfprintf(out, "%ld (reference)", (long)obj);
-                                break;
-
                             case H5I_VFL:
                                 HDfprintf(out, "%ld (file driver)", (long)obj);
                                 break;
@@ -1409,7 +1405,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5_index_t idx_type = (H5_index_t)va_arg(ap, int);
+                            H5_index_t idx_type = (H5_index_t)HDva_arg(ap, int);
 
                             switch(idx_type) {
                                 case H5_INDEX_UNKNOWN:
@@ -1443,7 +1439,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5_iter_order_t order = (H5_iter_order_t)va_arg(ap, int);
+                            H5_iter_order_t order = (H5_iter_order_t)HDva_arg(ap, int);
 
                             switch(order) {
                                 case H5_ITER_UNKNOWN:
@@ -1490,7 +1486,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            int is = va_arg(ap, int);
+                            int is = HDva_arg(ap, int);
 
                             HDfprintf (out, "%d", is);
                             asize[argno] = is;
@@ -1505,7 +1501,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5I_type_t id_type = (H5I_type_t)va_arg(ap, int);
+                            H5I_type_t id_type = (H5I_type_t)HDva_arg(ap, int);
 
                             switch (id_type) {
                                 case H5I_UNINIT:
@@ -1540,10 +1536,6 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                     HDfprintf(out, "H5I_ATTR");
                                     break;
 
-                                case H5I_REFERENCE:
-                                    HDfprintf(out, "H5I_REFERENCE");
-                                    break;
-
                                 case H5I_VFL:
                                     HDfprintf(out, "H5I_VFL");
                                     break;
@@ -1600,7 +1592,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            unsigned iu = va_arg(ap, unsigned);
+                            unsigned iu = HDva_arg(ap, unsigned);
 
                             HDfprintf(out, "%u", iu);
                             asize[argno] = iu;
@@ -1623,7 +1615,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5L_type_t link_type = (H5L_type_t)va_arg(ap, int);
+                            H5L_type_t link_type = (H5L_type_t)HDva_arg(ap, int);
 
                             switch(link_type) {
                                 case H5L_TYPE_ERROR:
@@ -1670,7 +1662,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                         } /* end if */
 #ifdef H5_HAVE_PARALLEL
                         else {
-                            MPI_Comm comm = va_arg(ap, MPI_Comm);
+                            MPI_Comm comm = HDva_arg(ap, MPI_Comm);
 
                             HDfprintf(out, "%ld", (long)comm);
                         } /* end else */
@@ -1686,7 +1678,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                         } /* end if */
 #ifdef H5_HAVE_PARALLEL
                         else {
-                            MPI_Info info = va_arg(ap, MPI_Info);
+                            MPI_Info info = HDva_arg(ap, MPI_Info);
 
                             HDfprintf(out, "%ld", (long)info);
                         } /* end else */
@@ -1701,7 +1693,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5FD_mem_t mt = (H5FD_mem_t)va_arg(ap, int);
+                            H5FD_mem_t mt = (H5FD_mem_t)HDva_arg(ap, int);
 
                             switch(mt) {
                                 case H5FD_MEM_NOLIST:
@@ -1760,7 +1752,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                         HDfprintf(out, "NULL");
                 } /* end if */
                 else {
-                    off_t offset = va_arg(ap, off_t);
+                    off_t offset = HDva_arg(ap, off_t);
 
                     HDfprintf (out, "%ld", (long)offset);
                 } /* end else */
@@ -1776,7 +1768,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5O_type_t objtype = (H5O_type_t)va_arg(ap, int);
+                            H5O_type_t objtype = (H5O_type_t)HDva_arg(ap, int);
 
                             switch(objtype) {
                                 case H5O_TYPE_UNKNOWN:
@@ -1820,7 +1812,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                         HDfprintf(out, "NULL");
                 } /* end if */
                 else {
-                    hid_t pclass_id = va_arg(ap, hid_t);
+                    hid_t pclass_id = HDva_arg(ap, hid_t);
                     char *class_name = NULL;
                     H5P_genclass_t *pclass;
 
@@ -1844,7 +1836,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                         HDfprintf(out, "NULL");
                 } /* end if */
                 else {
-                    hobj_ref_t ref = va_arg(ap, hobj_ref_t);
+                    hobj_ref_t ref = HDva_arg(ap, hobj_ref_t);
 
                     HDfprintf(out, "Reference Object=%a", ref);
                 } /* end else */
@@ -1860,7 +1852,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5R_type_t reftype = (H5R_type_t)va_arg(ap, int);
+                            H5R_type_t reftype = (H5R_type_t)HDva_arg(ap, int);
 
                             switch(reftype) {
                                 case H5R_BADTYPE:
@@ -1902,7 +1894,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5S_class_t cls = (H5S_class_t)va_arg(ap, int);
+                            H5S_class_t cls = (H5S_class_t)HDva_arg(ap, int);
 
                             switch(cls) {
                                 case H5S_NO_CLASS:
@@ -1936,7 +1928,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5S_seloper_t so = (H5S_seloper_t)va_arg(ap, int);
+                            H5S_seloper_t so = (H5S_seloper_t)HDva_arg(ap, int);
 
                             switch(so) {
                                 case H5S_SELECT_NOOP:
@@ -1994,7 +1986,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5S_sel_type st = (H5S_sel_type)va_arg(ap, int);
+                            H5S_sel_type st = (H5S_sel_type)HDva_arg(ap, int);
 
                             switch(st) {
                                 case H5S_SEL_ERROR:
@@ -2042,7 +2034,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                         HDfprintf(out, "NULL");
                 } /* end if */
                 else {
-                    const char *str = va_arg(ap, const char *);
+                    const char *str = HDva_arg(ap, const char *);
 
                     HDfprintf(out, "\"%s\"", str);
                 } /* end else */
@@ -2058,7 +2050,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5T_cset_t cset = (H5T_cset_t)va_arg(ap, int);
+                            H5T_cset_t cset = (H5T_cset_t)HDva_arg(ap, int);
 
                             switch(cset) {
                                 case H5T_CSET_ERROR:
@@ -2105,7 +2097,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5T_direction_t direct = (H5T_direction_t)va_arg(ap, int);
+                            H5T_direction_t direct = (H5T_direction_t)HDva_arg(ap, int);
 
                             switch(direct) {
                                 case H5T_DIR_DEFAULT:
@@ -2135,7 +2127,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5T_pers_t pers = (H5T_pers_t)va_arg(ap, int);
+                            H5T_pers_t pers = (H5T_pers_t)HDva_arg(ap, int);
 
                             switch(pers) {
                                 case H5T_PERS_DONTCARE:
@@ -2165,7 +2157,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5T_norm_t norm = (H5T_norm_t)va_arg(ap, int);
+                            H5T_norm_t norm = (H5T_norm_t)HDva_arg(ap, int);
 
                             switch(norm) {
                                 case H5T_NORM_ERROR:
@@ -2199,7 +2191,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5T_order_t order = (H5T_order_t)va_arg(ap, int);
+                            H5T_order_t order = (H5T_order_t)HDva_arg(ap, int);
 
                             switch(order) {
                                 case H5T_ORDER_ERROR:
@@ -2241,7 +2233,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5T_pad_t pad = (H5T_pad_t)va_arg(ap, int);
+                            H5T_pad_t pad = (H5T_pad_t)HDva_arg(ap, int);
 
                             switch(pad) {
                                 case H5T_PAD_ERROR:
@@ -2279,7 +2271,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5T_sign_t sign = (H5T_sign_t)va_arg(ap, int);
+                            H5T_sign_t sign = (H5T_sign_t)HDva_arg(ap, int);
 
                             switch(sign) {
                                 case H5T_SGN_ERROR:
@@ -2313,7 +2305,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5T_class_t type_class = (H5T_class_t)va_arg(ap, int);
+                            H5T_class_t type_class = (H5T_class_t)HDva_arg(ap, int);
 
                             switch(type_class) {
                                 case H5T_NO_CLASS:
@@ -2383,7 +2375,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5T_str_t str = (H5T_str_t)va_arg(ap, int);
+                            H5T_str_t str = (H5T_str_t)HDva_arg(ap, int);
 
                             switch(str) {
                                 case H5T_STR_ERROR:
@@ -2439,7 +2431,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                         HDfprintf(out, "NULL");
                 } /* end if */
                 else {
-                    htri_t tri_var = va_arg (ap, htri_t);
+                    htri_t tri_var = HDva_arg (ap, htri_t);
 
                     if(tri_var>0)
                         HDfprintf (out, "TRUE");
@@ -2469,7 +2461,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            unsigned long iul = va_arg(ap, unsigned long);
+                            unsigned long iul = HDva_arg(ap, unsigned long);
 
                             HDfprintf(out, "%lu", iul);
                             asize[argno] = (hssize_t)iul;
@@ -2493,7 +2485,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            unsigned long long iull = va_arg(ap, unsigned long long);
+                            unsigned long long iull = HDva_arg(ap, unsigned long long);
 
                             HDfprintf(out, "%llu", iull);
                             asize[argno] = (hssize_t)iull;
@@ -2516,7 +2508,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_attr_get_t get = (H5VL_attr_get_t)va_arg(ap, int);
+                            H5VL_attr_get_t get = (H5VL_attr_get_t)HDva_arg(ap, int);
 
                             switch(get) {
                                 case H5VL_ATTR_GET_SPACE:
@@ -2551,7 +2543,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_attr_specific_t specific = (H5VL_attr_specific_t)va_arg(ap, int);
+                            H5VL_attr_specific_t specific = (H5VL_attr_specific_t)HDva_arg(ap, int);
 
                             switch(specific) {
                                 case H5VL_ATTR_DELETE:
@@ -2580,7 +2572,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_class_value_t class_val = (H5VL_class_value_t)va_arg(ap, H5VL_class_value_t);
+                            H5VL_class_value_t class_val = (H5VL_class_value_t)HDva_arg(ap, H5VL_class_value_t);
 
                             if(H5_VOL_NATIVE == class_val)
                                 HDfprintf(out, "H5_VOL_NATIVE");
@@ -2596,7 +2588,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_dataset_get_t get = (H5VL_dataset_get_t)va_arg(ap, int);
+                            H5VL_dataset_get_t get = (H5VL_dataset_get_t)HDva_arg(ap, int);
 
                             switch(get) {
                                 case H5VL_DATASET_GET_SPACE:
@@ -2634,7 +2626,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_dataset_specific_t specific = (H5VL_dataset_specific_t)va_arg(ap, int);
+                            H5VL_dataset_specific_t specific = (H5VL_dataset_specific_t)HDva_arg(ap, int);
 
                             switch(specific) {
                                 case H5VL_DATASET_SET_EXTENT:
@@ -2660,7 +2652,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_datatype_get_t get = (H5VL_datatype_get_t)va_arg(ap, int);
+                            H5VL_datatype_get_t get = (H5VL_datatype_get_t)HDva_arg(ap, int);
 
                             switch(get) {
                                 case H5VL_DATATYPE_GET_BINARY:
@@ -2683,7 +2675,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_datatype_specific_t specific = (H5VL_datatype_specific_t)va_arg(ap, int);
+                            H5VL_datatype_specific_t specific = (H5VL_datatype_specific_t)HDva_arg(ap, int);
 
                             switch(specific) {
                                 case H5VL_DATATYPE_FLUSH:
@@ -2706,7 +2698,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_file_get_t get = (H5VL_file_get_t)va_arg(ap, int);
+                            H5VL_file_get_t get = (H5VL_file_get_t)HDva_arg(ap, int);
 
                             switch(get) {
                                 case H5VL_FILE_GET_FAPL:
@@ -2741,7 +2733,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_file_specific_t specific = (H5VL_file_specific_t)va_arg(ap, int);
+                            H5VL_file_specific_t specific = (H5VL_file_specific_t)HDva_arg(ap, int);
 
                             switch(specific) {
                                 case H5VL_FILE_FLUSH:
@@ -2759,9 +2751,6 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 case H5VL_FILE_IS_ACCESSIBLE:
                                     HDfprintf(out, "H5VL_FILE_IS_ACCESSIBLE");
                                     break;
-                                case H5VL_FILE_CACHE_VOL_CONN:
-                                    HDfprintf(out, "H5VL_FILE_CACHE_VOL_CONN");
-                                    break;
                                 default:
                                     HDfprintf(out, "%ld", (long)specific);
                                     break;
@@ -2776,7 +2765,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_group_get_t get = (H5VL_group_get_t)va_arg(ap, int);
+                            H5VL_group_get_t get = (H5VL_group_get_t)HDva_arg(ap, int);
 
                             switch(get) {
                                 case H5VL_GROUP_GET_GCPL:
@@ -2799,7 +2788,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_group_specific_t specific = (H5VL_group_specific_t)va_arg(ap, int);
+                            H5VL_group_specific_t specific = (H5VL_group_specific_t)HDva_arg(ap, int);
 
                             switch(specific) {
                                 case H5VL_GROUP_FLUSH:
@@ -2822,7 +2811,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_link_create_type_t create = (H5VL_link_create_type_t)va_arg(ap, int);
+                            H5VL_link_create_type_t create = (H5VL_link_create_type_t)HDva_arg(ap, int);
 
                             switch(create) {
                                 case H5VL_LINK_CREATE_HARD:
@@ -2848,7 +2837,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_link_get_t get = (H5VL_link_get_t)va_arg(ap, int);
+                            H5VL_link_get_t get = (H5VL_link_get_t)HDva_arg(ap, int);
 
                             switch(get) {
                                 case H5VL_LINK_GET_INFO:
@@ -2874,7 +2863,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_link_specific_t specific = (H5VL_link_specific_t)va_arg(ap, int);
+                            H5VL_link_specific_t specific = (H5VL_link_specific_t)HDva_arg(ap, int);
 
                             switch(specific) {
                                 case H5VL_LINK_DELETE:
@@ -2900,7 +2889,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_object_get_t get = (H5VL_object_get_t)va_arg(ap, int);
+                            H5VL_object_get_t get = (H5VL_object_get_t)HDva_arg(ap, int);
 
                             switch(get) {
                                 case H5VL_REF_GET_REGION:
@@ -2929,7 +2918,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_object_specific_t specific = (H5VL_object_specific_t)va_arg(ap, int);
+                            H5VL_object_specific_t specific = (H5VL_object_specific_t)HDva_arg(ap, int);
 
                             switch(specific) {
                                 case H5VL_OBJECT_CHANGE_REF_COUNT:
@@ -2964,7 +2953,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5VL_request_specific_t specific = (H5VL_request_specific_t)va_arg(ap, int);
+                            H5VL_request_specific_t specific = (H5VL_request_specific_t)HDva_arg(ap, int);
 
                             switch(specific) {
                                 case H5VL_REQUEST_WAITANY:
@@ -3009,7 +2998,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                         HDfprintf(out, "NULL");
                 } /* end if */
                 else {
-                    vp = va_arg (ap, void *);
+                    vp = HDva_arg (ap, void *);
 
                     if(vp)
                         HDfprintf(out, "0x%lx", (unsigned long)vp);
@@ -3035,7 +3024,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                         HDfprintf(out, "NULL");
                 } /* end if */
                 else {
-                    size_t size = va_arg(ap, size_t);
+                    size_t size = HDva_arg(ap, size_t);
 
                     HDfprintf(out, "%Zu", size);
                     asize[argno] = (hssize_t)size;
@@ -3052,7 +3041,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5Z_SO_scale_type_t scale_type = (H5Z_SO_scale_type_t)va_arg(ap, int);
+                            H5Z_SO_scale_type_t scale_type = (H5Z_SO_scale_type_t)HDva_arg(ap, int);
 
                             switch(scale_type) {
                                 case H5Z_SO_FLOAT_DSCALE:
@@ -3082,7 +3071,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5Z_class2_t *filter = va_arg(ap, H5Z_class2_t*);
+                            H5Z_class2_t *filter = HDva_arg(ap, H5Z_class2_t*);
 
                             HDfprintf(out, "0x%lx", (unsigned long)filter);
                         } /* end else */
@@ -3096,7 +3085,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5Z_EDC_t edc = (H5Z_EDC_t)va_arg(ap, int);
+                            H5Z_EDC_t edc = (H5Z_EDC_t)HDva_arg(ap, int);
 
                             if(H5Z_DISABLE_EDC == edc)
                                 HDfprintf(out, "H5Z_DISABLE_EDC");
@@ -3115,7 +3104,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            H5Z_filter_t id = va_arg(ap, H5Z_filter_t);
+                            H5Z_filter_t id = HDva_arg(ap, H5Z_filter_t);
 
                             if(H5Z_FILTER_DEFLATE == id)
                                 HDfprintf(out, "H5Z_FILTER_DEFLATE");
@@ -3141,7 +3130,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                                 HDfprintf(out, "NULL");
                         } /* end if */
                         else {
-                            ssize_t ssize = va_arg(ap, ssize_t);
+                            ssize_t ssize = HDva_arg(ap, ssize_t);
 
                             HDfprintf(out, "%Zd", ssize);
                             asize[argno] = (hssize_t)ssize;
@@ -3169,7 +3158,7 @@ H5_trace(const double *returning, const char *func, const char *type, ...)
                 (event_time.etime - *returning));
 
 error:
-    va_end(ap);
+    HDva_end(ap);
     if(returning)
         HDfprintf(out, ";\n");
     else {
diff --git a/src/H5win32defs.h b/src/H5win32defs.h
index 4522228..140afc3 100644
--- a/src/H5win32defs.h
+++ b/src/H5win32defs.h
@@ -62,9 +62,17 @@ typedef __int64             h5_stat_size_t;
 #define HDstat(S,B)         _stati64(S,B)
 #define HDstrcasecmp(A,B)   _stricmp(A,B)
 #define HDstrdup(S)         _strdup(S)
+#define HDstrtok_r(X,Y,Z)   strtok_s(X,Y,Z)
 #define HDtzset()           _tzset()
 #define HDunlink(S)         _unlink(S)
 #define HDwrite(F,M,Z)      _write(F,M,Z)
+#if (_MSC_VER < 1800)
+/* va_copy() does not exist on pre-2013 Visual Studio. Since va_lists are
+ * just pointers into the stack in those CRTs, the usual work-around
+ * is to just define the operation as a pointer copy.
+ */
+#define HDva_copy(D,S)      ((D) = (S))
+#endif /* MSC_VER < 1800 */
 
 #ifdef H5_HAVE_VISUAL_STUDIO
 
diff --git a/src/Makefile.am b/src/Makefile.am
index ebe3632..86012cd 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -40,12 +40,12 @@ DISTCLEANFILES=H5pubconf.h
 # library sources
 libhdf5_la_SOURCES= H5.c H5checksum.c H5dbg.c H5system.c H5timer.c H5trace.c \
         H5A.c H5Abtree2.c H5Adense.c H5Adeprec.c H5Aint.c H5Atest.c \
-        H5AC.c H5ACdbg.c H5AClog.c H5ACproxy_entry.c \
+        H5AC.c H5ACdbg.c H5ACproxy_entry.c \
         H5B.c H5Bcache.c H5Bdbg.c \
         H5B2.c H5B2cache.c H5B2dbg.c H5B2hdr.c H5B2int.c H5B2internal.c \
         H5B2leaf.c H5B2stat.c H5B2test.c \
-        H5C.c H5Cdbg.c H5Cepoch.c H5Cimage.c H5Clog.c H5Cprefetched.c \
-        H5Cquery.c H5Ctag.c H5Ctest.c \
+        H5C.c H5Cdbg.c H5Cepoch.c H5Cimage.c H5Clog.c H5Clog_json.c H5Clog_trace.c \
+        H5Cprefetched.c H5Cquery.c H5Ctag.c H5Ctest.c \
         H5CS.c \
         H5CX.c \
         H5D.c H5Dbtree.c H5Dbtree2.c H5Dchunk.c H5Dcompact.c H5Dcontig.c H5Ddbg.c \
@@ -114,7 +114,10 @@ libhdf5_la_SOURCES= H5.c H5checksum.c H5dbg.c H5system.c H5timer.c H5trace.c \
         H5Topaque.c \
         H5Torder.c \
         H5Tpad.c H5Tprecis.c H5Tstrpad.c H5Tvisit.c H5Tvlen.c H5TS.c \
-        H5VL.c H5VLcallback.c H5VLint.c H5VLnative.c H5VLpassthru.c \
+        H5VL.c H5VLcallback.c H5VLint.c H5VLnative.c \
+		H5VLnative_attr.c H5VLnative_dataset.c H5VLnative_datatype.c \
+		H5VLnative_file.c H5VLnative_group.c H5VLnative_link.c H5VLnative_object.c \
+		H5VLpassthru.c \
         H5VLrados.c \
         H5VM.c H5WB.c H5Z.c  \
         H5Zdeflate.c H5Zfletcher32.c H5Znbit.c H5Zshuffle.c \
diff --git a/src/libhdf5.settings.in b/src/libhdf5.settings.in
index 531cd00..9d0e29f 100644
--- a/src/libhdf5.settings.in
+++ b/src/libhdf5.settings.in
@@ -82,7 +82,6 @@ Parallel Filtered Dataset Writes: @PARALLEL_FILTERED_WRITES@
                      API tracing: @TRACE_API@
             Using memory checker: @USINGMEMCHECKER@
  Memory allocation sanity checks: @MEMORYALLOCSANITYCHECK@
-             Metadata trace file: @METADATATRACEFILE@
           Function stack tracing: @CODESTACK@
        Strict file format checks: @STRICT_FORMAT_CHECKS@
     Optimization instrumentation: @INSTRUMENT_LIBRARY@
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index ed6bacc..0d67485 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -133,7 +133,7 @@ if (BUILD_SHARED_LIBS)
   # Define VOL Plugin Test Sources
   #-----------------------------------------------------------------------------
   set (VOL_PLUGIN_LIBS
-      echo_vol
+      null_vol_connector
   )
 
   foreach (vol_lib ${VOL_PLUGIN_LIBS})
@@ -374,6 +374,7 @@ set (H5_CHECK_TESTS
     atomic_reader
     links_env
     filenotclosed
+    del_many_dense_attrs
     flushrefresh
 )
 
diff --git a/test/CMakeTests.cmake b/test/CMakeTests.cmake
index 3ad9de7..c0d4813 100644
--- a/test/CMakeTests.cmake
+++ b/test/CMakeTests.cmake
@@ -359,6 +359,9 @@ set (test_CLEANFILES
     lheap.h5
     fheap.h5
     ohdr.h5
+    ohdr_min_a.h5
+    ohdr_min_b.h5
+    min_dset_ohdr_testfile.h5
     stab.h5
     extern_*.h5
     extern_*.raw
@@ -517,6 +520,7 @@ set (test_CLEANFILES
     flushrefresh_VERIFICATION_CHECKPOINT2
     flushrefresh_VERIFICATION_DONE
     filenotclosed.h5
+    del_many_dense_attrs.h5
     atomic_data
     accum_swmr_big.h5
     ohdr_swmr.h5
@@ -793,6 +797,7 @@ set_tests_properties (H5TEST-tcheck_version-release PROPERTIES
 #    atomic_reader
 #    links_env
 #    filenotclosed
+#    del_many_dense_attrs
 #    flushrefresh
 ##############################################################################
 # autotools script tests
@@ -800,7 +805,7 @@ set_tests_properties (H5TEST-tcheck_version-release PROPERTIES
 # NOT CONVERTED accum_swmr_reader is used by accum.c.
 # NOT CONVERTED atomic_writer and atomic_reader are standalone programs.
 # links_env is used by testlinks_env.sh
-# filenotclosed is used by test_filenotclosed.sh
+# filenotclosed and del_many_dense_attrs are used by testabort_fail.sh
 # NOT CONVERTED flushrefresh is used by testflushrefresh.sh.
 # NOT CONVERTED use_append_chunk, use_append_mchunks and use_disable_mdc_flushes are used by test_usecases.sh
 # NOT CONVERTED swmr_* files (besides swmr.c) are used by testswmr.sh.
@@ -827,6 +832,23 @@ set_tests_properties (H5TEST-filenotclosed PROPERTIES
     WORKING_DIRECTORY ${HDF5_TEST_BINARY_DIR}/H5TEST
 )
 
+#-- Adding test for del_many_dense_attrs
+add_test (
+    NAME H5TEST-clear-del_many_dense_attrs-objects
+    COMMAND    ${CMAKE_COMMAND}
+        -E remove
+        del_many_dense_attrs.h5
+    WORKING_DIRECTORY
+        ${HDF5_TEST_BINARY_DIR}/H5TEST
+)
+set_tests_properties (H5TEST-clear-del_many_dense_attrs-objects PROPERTIES FIXTURES_SETUP  del_many_dense_attrs_clear_objects)
+add_test (NAME H5TEST-del_many_dense_attrs COMMAND $<TARGET_FILE:del_many_dense_attrs>)
+set_tests_properties (H5TEST-del_many_dense_attrs PROPERTIES
+    FIXTURES_REQUIRED del_many_dense_attrs_clear_objects
+    ENVIRONMENT "srcdir=${HDF5_TEST_BINARY_DIR}/H5TEST"
+    WORKING_DIRECTORY ${HDF5_TEST_BINARY_DIR}/H5TEST
+)
+
 #-- Adding test for err_compat
 if (HDF5_ENABLE_DEPRECATED_SYMBOLS)
   add_test (NAME H5TEST-clear-err_compat-objects
@@ -843,6 +865,7 @@ if (HDF5_ENABLE_DEPRECATED_SYMBOLS)
       -D "TEST_ARGS:STRING="
       -D "TEST_EXPECT=0"
       -D "TEST_MASK_ERROR=true"
+      -D "ERROR_APPEND=1"
       -D "TEST_OUTPUT=err_compat.txt"
       -D "TEST_REFERENCE=err_compat_1"
       -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/H5TEST"
@@ -877,6 +900,7 @@ else ()
       -D "TEST_ARGS:STRING="
       -D "TEST_EXPECT=0"
       -D "TEST_MASK_ERROR=true"
+      -D "ERROR_APPEND=1"
       -D "TEST_OUTPUT=error_test.txt"
       -D "TEST_REFERENCE=error_test_1"
       -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/H5TEST"
@@ -943,6 +967,7 @@ if (BUILD_SHARED_LIBS)
         -D "TEST_ARGS:STRING="
         -D "TEST_EXPECT=0"
         -D "TEST_MASK_ERROR=true"
+        -D "ERROR_APPEND=1"
         -D "TEST_OUTPUT=err_compat.txt"
         -D "TEST_REFERENCE=err_compat_1"
         -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/H5TEST-shared"
@@ -977,6 +1002,7 @@ if (BUILD_SHARED_LIBS)
         -D "TEST_ARGS:STRING="
         -D "TEST_EXPECT=0"
         -D "TEST_MASK_ERROR=true"
+        -D "ERROR_APPEND=1"
         -D "TEST_OUTPUT=error_test.txt"
         -D "TEST_REFERENCE=error_test_1"
         -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/H5TEST-shared"
@@ -1123,6 +1149,16 @@ endif ()
 
 ##############################################################################
 ##############################################################################
+###                         V O L   T E S T S                              ###
+##############################################################################
+##############################################################################
+
+if (HDF5_TEST_VOL)
+  include (CMakeVOLTests.cmake)
+endif ()
+
+##############################################################################
+##############################################################################
 ###           T H E   G E N E R A T O R S                                  ###
 ##############################################################################
 ##############################################################################
diff --git a/test/CMakeVOLTests.cmake b/test/CMakeVOLTests.cmake
new file mode 100644
index 0000000..39fa2a6
--- /dev/null
+++ b/test/CMakeVOLTests.cmake
@@ -0,0 +1,322 @@
+
+# Copyright by The HDF Group.
+# All rights reserved.
+#
+# This file is part of HDF5.  The full HDF5 copyright notice, including
+# terms governing use, modification, and redistribution, is contained in
+# the COPYING file, which can be found at the root of the source code
+# distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.
+# If you do not have access to either file, you may request a copy from
+# help@hdfgroup.org.
+#
+
+##############################################################################
+##############################################################################
+###           T E S T I N G                                                ###
+##############################################################################
+##############################################################################
+# included from CMakeTests.cmake
+
+set (VOL_LIST
+    vol_native
+    vol_pass_through1
+    vol_pass_through2
+)
+
+set (vol_native native)
+set (vol_pass_through1 "pass_through under_vol=0\;under_info={}")
+set (vol_pass_through2 "pass_through under_vol=505\;under_info={under_vol=0\;under_info={}}")
+
+foreach (voltest ${VOL_LIST})
+  file (MAKE_DIRECTORY "${PROJECT_BINARY_DIR}/${voltest}")
+  file (MAKE_DIRECTORY "${PROJECT_BINARY_DIR}/${voltest}/testfiles")
+  file (MAKE_DIRECTORY "${PROJECT_BINARY_DIR}/${voltest}/testfiles/plist_files")
+  if (BUILD_SHARED_LIBS)
+    file (MAKE_DIRECTORY "${PROJECT_BINARY_DIR}/${voltest}-shared")
+    file (MAKE_DIRECTORY "${PROJECT_BINARY_DIR}/${voltest}-shared/testfiles")
+    file (MAKE_DIRECTORY "${PROJECT_BINARY_DIR}/${voltest}-shared/testfiles/plist_files")
+  endif ()
+endforeach ()
+
+foreach (voltest ${VOL_LIST})
+  foreach (h5_tfile ${HDF5_TEST_FILES})
+    HDFTEST_COPY_FILE("${HDF5_TOOLS_DIR}/testfiles/${h5_tfile}" "${PROJECT_BINARY_DIR}/${voltest}/${h5_tfile}" "HDF5_VOLTEST_LIB_files")
+    if (BUILD_SHARED_LIBS)
+      HDFTEST_COPY_FILE("${HDF5_TOOLS_DIR}/testfiles/${h5_tfile}" "${PROJECT_BINARY_DIR}/${voltest}-shared/${h5_tfile}" "HDF5_VOLTEST_LIBSH_files")
+    endif ()
+  endforeach ()
+endforeach ()
+
+foreach (voltest ${VOL_LIST})
+  foreach (ref_file ${HDF5_REFERENCE_FILES})
+    HDFTEST_COPY_FILE("${HDF5_TEST_SOURCE_DIR}/testfiles/${ref_file}" "${PROJECT_BINARY_DIR}/${voltest}/${ref_file}" "HDF5_VOLTEST_LIB_files")
+    if (BUILD_SHARED_LIBS)
+      HDFTEST_COPY_FILE("${HDF5_TEST_SOURCE_DIR}/testfiles/${ref_file}" "${PROJECT_BINARY_DIR}/${voltest}-shared/${ref_file}" "HDF5_VOLTEST_LIBSH_files")
+    endif ()
+  endforeach ()
+endforeach ()
+
+foreach (voltest ${VOL_LIST})
+  foreach (h5_file ${HDF5_REFERENCE_TEST_FILES})
+    HDFTEST_COPY_FILE("${HDF5_TEST_SOURCE_DIR}/${h5_file}" "${HDF5_TEST_BINARY_DIR}/${voltest}/${h5_file}" "HDF5_VOLTEST_LIB_files")
+    if (BUILD_SHARED_LIBS)
+      HDFTEST_COPY_FILE("${HDF5_TEST_SOURCE_DIR}/${h5_file}" "${HDF5_TEST_BINARY_DIR}/${voltest}-shared/${h5_file}" "HDF5_VOLTEST_LIBSH_files")
+    endif ()
+  endforeach ()
+endforeach ()
+
+foreach (voltest ${VOL_LIST})
+  foreach (plistfile ${HDF5_REFERENCE_PLIST_FILES})
+    HDFTEST_COPY_FILE("${HDF5_TEST_SOURCE_DIR}/testfiles/plist_files/${plistfile}" "${PROJECT_BINARY_DIR}/${voltest}/testfiles/plist_files/${plistfile}" "HDF5_VOLTEST_LIB_files")
+    HDFTEST_COPY_FILE("${HDF5_TEST_SOURCE_DIR}/testfiles/plist_files/def_${plistfile}" "${PROJECT_BINARY_DIR}/${voltest}/testfiles/plist_files/def_${plistfile}" "HDF5_VOLTEST_LIB_files")
+    if (BUILD_SHARED_LIBS)
+      HDFTEST_COPY_FILE("${HDF5_TEST_SOURCE_DIR}/testfiles/plist_files/${plistfile}" "${PROJECT_BINARY_DIR}/${voltest}-shared/testfiles/plist_files/${plistfile}" "HDF5_VOLTEST_LIBSH_files")
+      HDFTEST_COPY_FILE("${HDF5_TEST_SOURCE_DIR}/testfiles/plist_files/def_${plistfile}" "${PROJECT_BINARY_DIR}/${voltest}-shared/testfiles/plist_files/def_${plistfile}" "HDF5_VOLTEST_LIBSH_files")
+    endif ()
+  endforeach ()
+endforeach ()
+
+add_custom_target(HDF5_VOLTEST_LIB_files ALL COMMENT "Copying files needed by HDF5_VOLTEST_LIB tests" DEPENDS ${HDF5_VOLTEST_LIB_files_list})
+if (BUILD_SHARED_LIBS)
+  add_custom_target(HDF5_VOLTEST_LIBSH_files ALL COMMENT "Copying files needed by HDF5_VOLTEST_LIBSH tests" DEPENDS ${HDF5_VOLTEST_LIBSH_files_list})
+endif ()
+
+##############################################################################
+##############################################################################
+###                         V O L   T E S T S                              ###
+##############################################################################
+##############################################################################
+
+  set (H5_VOL_SKIP_TESTS
+      cache
+      accum
+      fheap
+      big
+      vol
+      error_test
+      err_compat
+      tcheck_version
+      testmeta
+      links_env
+  )
+  if (NOT CYGWIN)
+    list (REMOVE_ITEM H5_VOL_SKIP_TESTS big cache)
+  endif ()
+
+  # Windows only macro
+  macro (CHECK_VOL_TEST voltest volname volinfo resultcode)
+    if ("${voltest}" STREQUAL "flush1" OR "${voltest}" STREQUAL "flush2")
+      if ("${volname}" STREQUAL "multi" OR "${volname}" STREQUAL "split")
+        if (NOT BUILD_SHARED_LIBS AND NOT ${HDF_CFG_NAME} MATCHES "Debug")
+          add_test (NAME VOL-${volname}-${voltest}
+              COMMAND "${CMAKE_COMMAND}"
+                  -D "TEST_PROGRAM=$<TARGET_FILE:${voltest}>"
+                  -D "TEST_ARGS:STRING="
+                  -D "TEST_VOL:STRING=${volinfo}"
+                  -D "TEST_EXPECT=${resultcode}"
+                  -D "TEST_OUTPUT=${volname}-${voltest}"
+                  -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/${volname}"
+                  -P "${HDF_RESOURCES_DIR}/volTest.cmake"
+          )
+          set_tests_properties (VOL-${volname}-${voltest} PROPERTIES
+              ENVIRONMENT "srcdir=${HDF5_TEST_BINARY_DIR}/${volname}"
+              WORKING_DIRECTORY ${HDF5_TEST_BINARY_DIR}/${volname}
+          )
+          if (BUILD_SHARED_LIBS)
+            add_test (NAME VOL-${volname}-${test}-shared
+                COMMAND "${CMAKE_COMMAND}"
+                    -D "TEST_PROGRAM=$<TARGET_FILE:${voltest}-shared>"
+                    -D "TEST_ARGS:STRING="
+                    -D "TEST_VOL:STRING=${volinfo}"
+                    -D "TEST_EXPECT=${resultcode}"
+                    -D "TEST_OUTPUT=${volname}-${voltest}-shared"
+                    -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/${volname}-shared"
+                    -P "${HDF_RESOURCES_DIR}/volTest.cmake"
+            )
+            set_tests_properties (VOL-${volname}-${voltest}-shared PROPERTIES
+                ENVIRONMENT "srcdir=${HDF5_TEST_BINARY_DIR}/${volname}-shared"
+                WORKING_DIRECTORY ${HDF5_TEST_BINARY_DIR}/${volname}-shared
+            )
+          endif ()
+        else ()
+          add_test (NAME VOL-${volname}-${voltest}
+              COMMAND ${CMAKE_COMMAND} -E echo "SKIP VOL-${volname}-${voltest}"
+          )
+          if (BUILD_SHARED_LIBS)
+            add_test (NAME VOL-${volname}-${test}-shared
+                COMMAND ${CMAKE_COMMAND} -E echo "SKIP VOL-${volname}-${voltest}-shared"
+            )
+          endif ()
+        endif ()
+      else ()
+        add_test (NAME VOL-${volname}-${voltest}
+            COMMAND "${CMAKE_COMMAND}"
+                -D "TEST_PROGRAM=$<TARGET_FILE:${voltest}>"
+                -D "TEST_ARGS:STRING="
+                -D "TEST_VOL:STRING=${volinfo}"
+                -D "TEST_EXPECT=${resultcode}"
+                -D "TEST_OUTPUT=${volname}-${voltest}"
+                -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/${volname}"
+                -P "${HDF_RESOURCES_DIR}/volTest.cmake"
+        )
+        set_tests_properties (VOL-${volname}-${voltest} PROPERTIES
+            ENVIRONMENT "srcdir=${HDF5_TEST_BINARY_DIR}/${volname}"
+            WORKING_DIRECTORY ${HDF5_TEST_BINARY_DIR}/${volname}
+        )
+        if (BUILD_SHARED_LIBS)
+          add_test (NAME VOL-${volname}-${test}-shared
+              COMMAND "${CMAKE_COMMAND}"
+                -D "TEST_PROGRAM=$<TARGET_FILE:${voltest}-shared>"
+                -D "TEST_ARGS:STRING="
+                -D "TEST_VOL:STRING=${volinfo}"
+                -D "TEST_EXPECT=${resultcode}"
+                -D "TEST_OUTPUT=${volname}-${voltest}-shared"
+                -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/${volname}-shared"
+                -P "${HDF_RESOURCES_DIR}/volTest.cmake"
+          )
+          set_tests_properties (VOL-${volname}-${voltest}-shared PROPERTIES
+              ENVIRONMENT "srcdir=${HDF5_TEST_BINARY_DIR}/${volname}-shared"
+              WORKING_DIRECTORY ${HDF5_TEST_BINARY_DIR}/${volname}-shared
+          )
+        endif ()
+      endif ()
+    else ()
+      add_test (NAME VOL-${volname}-${voltest}
+          COMMAND "${CMAKE_COMMAND}"
+              -D "TEST_PROGRAM=$<TARGET_FILE:${voltest}>"
+              -D "TEST_ARGS:STRING="
+              -D "TEST_VOL:STRING=${volinfo}"
+              -D "TEST_EXPECT=${resultcode}"
+              -D "TEST_OUTPUT=${volname}-${voltest}"
+              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/${volname}"
+              -P "${HDF_RESOURCES_DIR}/volTest.cmake"
+      )
+      set_tests_properties (VOL-${volname}-${voltest} PROPERTIES
+          ENVIRONMENT "srcdir=${HDF5_TEST_BINARY_DIR}/${volname};HDF5TestExpress=${HDF_TEST_EXPRESS}"
+          WORKING_DIRECTORY ${HDF5_TEST_BINARY_DIR}/${volname}
+      )
+      if (BUILD_SHARED_LIBS AND NOT "${voltest}" STREQUAL "cache")
+        add_test (NAME VOL-${volname}-${voltest}-shared
+            COMMAND "${CMAKE_COMMAND}"
+                -D "TEST_PROGRAM=$<TARGET_FILE:${voltest}-shared>"
+                -D "TEST_ARGS:STRING="
+                -D "TEST_VOL:STRING=${volinfo}"
+                -D "TEST_EXPECT=${resultcode}"
+                -D "TEST_OUTPUT=${volname}-${voltest}-shared"
+                -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/${volname}-shared"
+                -P "${HDF_RESOURCES_DIR}/volTest.cmake"
+        )
+        set_tests_properties (VOL-${volname}-${voltest}-shared PROPERTIES
+            ENVIRONMENT "srcdir=${HDF5_TEST_BINARY_DIR}/${volname}-shared;HDF5TestExpress=${HDF_TEST_EXPRESS}"
+            WORKING_DIRECTORY ${HDF5_TEST_BINARY_DIR}/${volname}-shared
+        )
+        endif ()
+    endif ()
+  endmacro ()
+
+  macro (DO_VOL_TEST voltest volname volinfo resultcode)
+      #message(STATUS "${voltest}-${volname} with ${volinfo}")
+      add_test (NAME VOL-${volname}-${voltest}
+          COMMAND "${CMAKE_COMMAND}"
+              -D "TEST_PROGRAM=$<TARGET_FILE:${voltest}>"
+              -D "TEST_ARGS:STRING="
+              -D "TEST_VOL:STRING=${volinfo}"
+              -D "TEST_EXPECT=${resultcode}"
+              -D "TEST_OUTPUT=${volname}-${voltest}"
+              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/${volname}"
+              -P "${HDF_RESOURCES_DIR}/volTest.cmake"
+      )
+      set_tests_properties (VOL-${volname}-${voltest} PROPERTIES
+          ENVIRONMENT "srcdir=${HDF5_TEST_BINARY_DIR}/${volname}"
+          WORKING_DIRECTORY ${HDF5_TEST_BINARY_DIR}/${volname}
+      )
+      if (BUILD_SHARED_LIBS)
+        add_test (NAME VOL-${volname}-${voltest}-shared
+            COMMAND "${CMAKE_COMMAND}"
+                -D "TEST_PROGRAM=$<TARGET_FILE:${voltest}-shared>"
+                -D "TEST_ARGS:STRING="
+                -D "TEST_VOL:STRING=${volinfo}"
+                -D "TEST_EXPECT=${resultcode}"
+                -D "TEST_OUTPUT=${volname}-${voltest}-shared"
+                -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/${volname}-shared"
+                -P "${HDF_RESOURCES_DIR}/volTest.cmake"
+        )
+        set_tests_properties (VOL-${volname}-${voltest}-shared PROPERTIES
+            ENVIRONMENT "srcdir=${HDF5_TEST_BINARY_DIR}/${volname}-shared"
+            WORKING_DIRECTORY ${HDF5_TEST_BINARY_DIR}/${volname}-shared
+        )
+      endif ()
+  endmacro ()
+
+  macro (ADD_VOL_TEST volname volinfo resultcode)
+    #message(STATUS "volname=${volname} volinfo=${volinfo}")
+    foreach (test ${H5_TESTS})
+      if (NOT ${test} IN_LIST H5_VOL_SKIP_TESTS)
+        if (WIN32)
+          CHECK_VOL_TEST (${test} ${volname} "${volinfo}" ${resultcode})
+        else ()
+          DO_VOL_TEST (${test} ${volname} "${volinfo}" ${resultcode})
+        endif ()
+      endif ()
+    endforeach ()
+    set_tests_properties (VOL-${volname}-flush2 PROPERTIES DEPENDS VOL-${volname}-flush1)
+    set_tests_properties (VOL-${volname}-flush1 PROPERTIES TIMEOUT 10)
+    set_tests_properties (VOL-${volname}-flush2 PROPERTIES TIMEOUT 10)
+    set_tests_properties (VOL-${volname}-istore PROPERTIES TIMEOUT 1800)
+    if (NOT CYGWIN)
+      set_tests_properties (VOL-${volname}-cache PROPERTIES TIMEOUT 1800)
+    endif ()
+    if (BUILD_SHARED_LIBS)
+      set_tests_properties (VOL-${volname}-flush2-shared PROPERTIES DEPENDS VOL-${volname}-flush1-shared)
+      set_tests_properties (VOL-${volname}-flush1-shared PROPERTIES TIMEOUT 10)
+      set_tests_properties (VOL-${volname}-flush2-shared PROPERTIES TIMEOUT 10)
+      set_tests_properties (VOL-${volname}-istore-shared PROPERTIES TIMEOUT 1800)
+      if (NOT CYGWIN AND NOT WIN32)
+        set_tests_properties (VOL-${volname}-cache-shared PROPERTIES TIMEOUT 1800)
+      endif ()
+    endif ()
+    if (HDF5_TEST_FHEAP_VOL)
+      add_test (NAME VOL-${volname}-fheap
+          COMMAND "${CMAKE_COMMAND}"
+              -D "TEST_PROGRAM=$<TARGET_FILE:fheap>"
+              -D "TEST_ARGS:STRING="
+              -D "TEST_VOL:STRING=${volinfo}"
+              -D "TEST_EXPECT=${resultcode}"
+              -D "TEST_OUTPUT=${volname}-fheap"
+              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/${volname}"
+              -P "${HDF_RESOURCES_DIR}/volTest.cmake"
+      )
+      set_tests_properties (VOL-${volname}-fheap PROPERTIES
+          TIMEOUT 1800
+          ENVIRONMENT "srcdir=${HDF5_TEST_BINARY_DIR}/${volname};HDF5TestExpress=${HDF_TEST_EXPRESS}"
+          WORKING_DIRECTORY ${HDF5_TEST_BINARY_DIR}/${volname}
+      )
+      if (BUILD_SHARED_LIBS)
+        add_test (NAME VOL-${volname}-fheap-shared
+            COMMAND "${CMAKE_COMMAND}"
+                -D "TEST_PROGRAM=$<TARGET_FILE:fheap-shared>"
+                -D "TEST_ARGS:STRING="
+                -D "TEST_VOL:STRING=${volinfo}"
+                -D "TEST_EXPECT=${resultcode}"
+                -D "TEST_OUTPUT=${volname}-fheap-shared"
+                -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/${volname}-shared"
+                -P "${HDF_RESOURCES_DIR}/volTest.cmake"
+        )
+        set_tests_properties (VOL-${volname}-fheap-shared PROPERTIES
+            TIMEOUT 1800
+            ENVIRONMENT "srcdir=${HDF5_TEST_BINARY_DIR}/${volname}-shared;HDF5TestExpress=${HDF_TEST_EXPRESS}"
+            WORKING_DIRECTORY ${HDF5_TEST_BINARY_DIR}/${volname}-shared
+        )
+      endif ()
+    endif ()
+  endmacro ()
+
+  # Run test with different Virtual File Driver
+  foreach (volname ${VOL_LIST})
+    #message(STATUS "volname=${volname}")
+    foreach (volinfo IN LISTS ${volname})
+      #message(STATUS "${volname} volinfo=${volinfo}")
+      ADD_VOL_TEST (${volname} "${volinfo}" 0)
+    endforeach ()
+  endforeach ()
+
diff --git a/test/Makefile.am b/test/Makefile.am
index 1526eca..88dc542 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -29,20 +29,21 @@ AM_CPPFLAGS+=-I$(top_srcdir)/src -I$(top_builddir)/src
 #       testflushrefresh.sh: flushrefresh
 #       testswmr.sh: swmr*
 #       testvdsswmr.sh: vds_swmr*
-#       test_filenotclosed.sh: filenotclosed.c
+#       testabort_fail.sh: filenotclosed.c and del_many_dense_attrs.c
 #       test_filter_plugin.sh: filter_plugin.c
 #       test_usecases.sh: use_append_chunk, use_append_mchunks, use_disable_mdc_flushes
-TEST_SCRIPT = testerror.sh testlibinfo.sh testcheck_version.sh testlinks_env.sh test_filenotclosed.sh\
-    testswmr.sh testvdsswmr.sh testflushrefresh.sh test_usecases.sh
-SCRIPT_DEPEND = error_test$(EXEEXT) err_compat$(EXEEXT) links_env$(EXEEXT) filenotclosed$(EXEEXT) \
+TEST_SCRIPT = testerror.sh testlibinfo.sh testcheck_version.sh testlinks_env.sh \
+    testswmr.sh testvdsswmr.sh testflushrefresh.sh test_usecases.sh testabort_fail.sh
+SCRIPT_DEPEND = error_test$(EXEEXT) err_compat$(EXEEXT) links_env$(EXEEXT) \
+    filenotclosed$(EXEEXT) del_many_dense_attrs$(EXEEXT) \
     flushrefresh$(EXEEXT) use_append_chunk$(EXEEXT) use_append_mchunks$(EXEEXT) use_disable_mdc_flushes$(EXEEXT) \
     swmr_generator$(EXEEXT) swmr_reader$(EXEEXT) swmr_writer$(EXEEXT) \
     swmr_remove_reader$(EXEEXT) swmr_remove_writer$(EXEEXT) swmr_addrem_writer$(EXEEXT) \
     swmr_sparse_reader$(EXEEXT) swmr_sparse_writer$(EXEEXT) swmr_start_write$(EXEEXT) \
     vds_swmr_gen$(EXEEXT) vds_swmr_reader$(EXEEXT) vds_swmr_writer$(EXEEXT)
 if HAVE_SHARED_CONDITIONAL
-  TEST_SCRIPT += test_filter_plugin.sh
-  SCRIPT_DEPEND += filter_plugin$(EXEEXT)
+  TEST_SCRIPT += test_filter_plugin.sh test_vol_plugin.sh
+  SCRIPT_DEPEND += filter_plugin$(EXEEXT) vol_plugin$(EXEEXT)
 endif
 
 check_SCRIPTS = $(TEST_SCRIPT)
@@ -52,8 +53,8 @@ check_SCRIPTS = $(TEST_SCRIPT)
 # As an exception, long-running tests should occur earlier in the list.
 # This gives them more time to run when tests are executing in parallel.
 TEST_PROG= testhdf5 \
-           cache cache_api cache_image cache_tagging lheap ohdr stab gheap \
-           evict_on_close farray earray btree2 fheap \
+           cache cache_api cache_image cache_tagging lheap ohdr \
+           stab gheap evict_on_close farray earray btree2 fheap \
            pool accum hyperslab istore bittests dt_arith page_buffer \
            dtypes dsets cmpd_dset filter_fail extend direct_chunk external efc \
            objcopy links unlink twriteorder big mtime fillval mount \
@@ -68,7 +69,7 @@ TEST_PROG= testhdf5 \
 # accum_swmr_reader is used by accum.c.
 # atomic_writer and atomic_reader are standalone programs.
 # links_env is used by testlinks_env.sh
-# filenotclosed is used by test_filenotclosed.sh
+# filenotclosed and del_many_dense_attrs are used by testabort_fail.sh
 # flushrefresh is used by testflushrefresh.sh.
 # use_append_chunk, use_append_mchunks and use_disable_mdc_flushes are used by test_usecases.sh
 # swmr_* files (besides swmr.c) are used by testswmr.sh.
@@ -78,12 +79,13 @@ TEST_PROG= testhdf5 \
 # and this lets automake keep all its test programs in one place.
 check_PROGRAMS=$(TEST_PROG) error_test err_compat tcheck_version \
     testmeta accum_swmr_reader atomic_writer atomic_reader \
-    links_env filenotclosed flushrefresh use_append_chunk use_append_mchunks use_disable_mdc_flushes \
+    links_env filenotclosed del_many_dense_attrs flushrefresh \
+    use_append_chunk use_append_mchunks use_disable_mdc_flushes \
     swmr_generator swmr_start_write swmr_reader swmr_writer swmr_remove_reader \
     swmr_remove_writer swmr_addrem_writer swmr_sparse_reader swmr_sparse_writer \
     swmr_check_compat_vfd vds_swmr_gen vds_swmr_reader vds_swmr_writer
 if HAVE_SHARED_CONDITIONAL
-  check_PROGRAMS+= filter_plugin
+  check_PROGRAMS+= filter_plugin vol_plugin
 endif
 
 # These programs generate test files for the tests.  They don't need to be
@@ -106,9 +108,7 @@ if HAVE_SHARED_CONDITIONAL
   # The libh5test library provides common support code for the tests.
   # The filter_plugin* libraries are for use in filter_plugin.c.
   # Build them as shared libraries if that option was enabled in configure.
-  #
-  # echo_vol is used for testing VOL plugin functionality.
-  noinst_LTLIBRARIES=libh5test.la libfilter_plugin1_dsets.la libfilter_plugin2_dsets.la libfilter_plugin3_dsets.la libfilter_plugin4_groups.la echo_vol.la
+  noinst_LTLIBRARIES=libh5test.la libfilter_plugin1_dsets.la libfilter_plugin2_dsets.la libfilter_plugin3_dsets.la libfilter_plugin4_groups.la libnull_vol_connector.la
   libfilter_plugin1_dsets_la_SOURCES=filter_plugin1_dsets.c
   libfilter_plugin2_dsets_la_SOURCES=filter_plugin2_dsets.c
   libfilter_plugin3_dsets_la_SOURCES=filter_plugin3_dsets.c
@@ -121,8 +121,10 @@ if HAVE_SHARED_CONDITIONAL
   libfilter_plugin4_groups_la_LIBADD=$(LIBHDF5)
 
   # VOL plugin test libraries
-  echo_vol_la_SOURCES=echo_vol.c
-  echo_vol_la_LDFLAGS=$(AM_LDFLAGS) -avoid-version -module -shared -export-dynamic -rpath /nowhere
+  #
+  # null_vol_connector is used for testing basic VOL plugin functionality.
+  libnull_vol_connector_la_SOURCES=null_vol_connector.c
+  libnull_vol_connector_la_LDFLAGS=$(AM_LDFLAGS) -avoid-version -module -shared -export-dynamic -rpath /nowhere
 
 else
   # The libh5test library provides common support code for the tests.
@@ -177,6 +179,7 @@ CHECK_CLEANFILES+=accum.h5 cmpd_dset.h5 compact_dataset.h5 dataset.h5 dset_offse
     extend.h5 istore.h5 extlinks*.h5 frspace.h5 links*.h5 \
     sys_file1 tfile[1-7].h5 th5s[1-4].h5 lheap.h5 fheap.h5 ohdr.h5 \
     stab.h5 extern_[1-5].h5 extern_[1-4][rw].raw gheap[0-4].h5 \
+    ohdr_min_a.h5 ohdr_min_b.h5 min_dset_ohdr_testfile.h5\
     dt_arith[1-2] links.h5 links[0-6]*.h5 extlinks[0-15].h5 tmp \
     big.data big[0-9][0-9][0-9][0-9][0-9].h5  \
     stdio.h5 sec2.h5 dtypes[0-9].h5 dtypes1[0].h5 dt_arith[1-2].h5 tattr.h5 \
@@ -220,6 +223,7 @@ use_disable_mdc_flushes_SOURCES=use_disable_mdc_flushes.c
 
 # Temporary files.
 DISTCLEANFILES=testerror.sh testlibinfo.sh testcheck_version.sh testlinks_env.sh test_filter_plugin.sh \
-    testswmr.sh testvdsswmr.sh test_usecases.sh testflushrefresh.sh test_filenotclosed.sh
+    testswmr.sh testvdsswmr.sh test_usecases.sh testflushrefresh.sh testabort_fail.sh \
+	test_vol_plugin.sh
 
 include $(top_srcdir)/config/conclude.am
diff --git a/test/ShellTests.cmake b/test/ShellTests.cmake
index 58dc85d..98f3daf 100644
--- a/test/ShellTests.cmake
+++ b/test/ShellTests.cmake
@@ -171,6 +171,7 @@ if (UNIX)
     #    atomic_writer
     #    atomic_reader
     #    filenotclosed
+    #    del_many_dense_attrs
     #    flushrefresh
     ##############################################################################
     # autotools script tests
@@ -178,7 +179,7 @@ if (UNIX)
     # NOT CONVERTED accum_swmr_reader is used by accum.c.
     # NOT CONVERTED atomic_writer and atomic_reader are standalone programs.
     # links_env is used by testlinks_env.sh
-    # filenotclosed is used by test_filenotclosed.sh
+    # filenotclosed and del_many_dense_attrs are used by testabort_fail.sh
     # NOT CONVERTED flushrefresh is used by testflushrefresh.sh.
     # NOT CONVERTED use_append_chunk, use_append_mchunks and use_disable_mdc_flushes are used by test_usecases.sh
     # NOT CONVERTED swmr_* files (besides swmr.c) are used by testswmr.sh.
diff --git a/test/accum.c b/test/accum.c
index 87628d8..7af353c 100644
--- a/test/accum.c
+++ b/test/accum.c
@@ -26,10 +26,13 @@
 #include "H5VLprivate.h"        /* Virtual Object Layer                     */
 
 /* Filename */
-#define FILENAME "accum.h5"
+/* (The file names are the same as the define in accum_swmr_reader.c) */
+const char *FILENAME[] = {
+    "accum",
+    "accum_swmr_big",
+    NULL
+};
 
-/* The file name is the same as the define in accum_swmr_reader.c */
-#define SWMR_FILENAME "accum_swmr_big.h5"
 /* The reader forked by test_swmr_write_big() */
 #define SWMR_READER "accum_swmr_reader"
 
@@ -92,6 +95,7 @@ main(void)
     hbool_t     api_ctx_pushed = FALSE;             /* Whether API context pushed */
     hid_t fid = -1;
     hid_t fapl = -1;			/* File access property list */
+    char  filename[1024];
     H5F_t * f = NULL;           /* File for all tests */
 
 
@@ -99,15 +103,13 @@ main(void)
     puts("Testing the metadata accumulator");
 
     /* File access property list */
+    h5_reset();
     if((fapl = h5_fileaccess()) < 0)
         FAIL_STACK_ERROR
+    h5_fixname(FILENAME[0], fapl, filename, sizeof filename);
 
     /* Create a test file */
-    if((fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0) FAIL_STACK_ERROR
-
-    /* Closing and remove the file */
-    if(H5Pclose(fapl) < 0)
-        FAIL_STACK_ERROR
+    if((fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0) FAIL_STACK_ERROR
 
     /* Push API context */
     if(H5CX_push() < 0) FAIL_STACK_ERROR
@@ -143,7 +145,6 @@ main(void)
 
     /* End of test code, close and delete file */
     if(H5Fclose(fid) < 0) TEST_ERROR
-    HDremove(FILENAME);
 
     /* This test uses a different file */
     nerrors += test_swmr_write_big(TRUE);
@@ -152,6 +153,7 @@ main(void)
     if(nerrors)
         goto error;
     puts("All metadata accumulator tests passed.");
+    h5_cleanup(FILENAME, fapl);
 
     return 0;
 
@@ -1828,6 +1830,7 @@ test_swmr_write_big(hbool_t newest_format)
     hid_t fid = -1;			    /* File ID */
     hid_t fapl = -1;			/* File access property list */
     H5F_t *rf = NULL;			/* File pointer */
+    char  filename[1024];
     uint8_t *wbuf2 = NULL, *rbuf = NULL;      /* Buffers for reading & writing */
     uint8_t wbuf[1024];			/* Buffer for reading & writing */
     unsigned u;                 /* Local index variable */
@@ -1865,17 +1868,18 @@ test_swmr_write_big(hbool_t newest_format)
     /* File access property list */
     if((fapl = h5_fileaccess()) < 0)
         FAIL_STACK_ERROR
+    h5_fixname(FILENAME[1], fapl, filename, sizeof filename);
 
     /* Both cases will result in v3 superblock and version 2 object header for SWMR */
     if(newest_format) { /* latest format */
         if(H5Pset_libver_bounds(fapl, H5F_LIBVER_LATEST, H5F_LIBVER_LATEST) < 0)
             FAIL_STACK_ERROR
 
-	if((fid = H5Fcreate(SWMR_FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0)
+	if((fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0)
 	    FAIL_STACK_ERROR
     }
     else { /* non-latest-format */
-        if((fid = H5Fcreate(SWMR_FILENAME, H5F_ACC_TRUNC|H5F_ACC_SWMR_WRITE, H5P_DEFAULT, fapl)) < 0)
+        if((fid = H5Fcreate(filename, H5F_ACC_TRUNC|H5F_ACC_SWMR_WRITE, H5P_DEFAULT, fapl)) < 0)
             FAIL_STACK_ERROR
     } /* end if */
 
@@ -1884,7 +1888,7 @@ test_swmr_write_big(hbool_t newest_format)
         FAIL_STACK_ERROR
 
     /* Open the file with SWMR_WRITE */
-    if((fid = H5Fopen(SWMR_FILENAME, H5F_ACC_RDWR | H5F_ACC_SWMR_WRITE, fapl)) < 0)
+    if((fid = H5Fopen(filename, H5F_ACC_RDWR | H5F_ACC_SWMR_WRITE, fapl)) < 0)
         FAIL_STACK_ERROR
 
     /* Push API context */
@@ -1979,20 +1983,19 @@ test_swmr_write_big(hbool_t newest_format)
         /* Flush the accumulator */
         if(accum_reset(rf) < 0)
             FAIL_STACK_ERROR;
-        /* Close the property list */
-        if(H5Pclose(fapl) < 0) 
-            FAIL_STACK_ERROR;
 
         /* Close and remove the file */
         if(H5Fclose(fid) < 0) 
             FAIL_STACK_ERROR;
 
+        /* Close the property list */
+        if(H5Pclose(fapl) < 0) 
+            FAIL_STACK_ERROR;
+
         /* Pop API context */
         if(api_ctx_pushed && H5CX_pop() < 0) FAIL_STACK_ERROR
         api_ctx_pushed = FALSE;
 
-        HDremove(SWMR_FILENAME);
-
         /* Release memory */
         if(wbuf2)
             HDfree(wbuf2);
@@ -2004,12 +2007,11 @@ test_swmr_write_big(hbool_t newest_format)
 
 error:
     /* Closing and remove the file */
-    H5Pclose(fapl);
     H5Fclose(fid);
 
     if(api_ctx_pushed) H5CX_pop();
 
-    HDremove(SWMR_FILENAME);
+    H5Pclose(fapl);
 
     /* Release memory */
     if(wbuf2)
diff --git a/test/accum_swmr_reader.c b/test/accum_swmr_reader.c
index 16e0ddc..ac48a13 100644
--- a/test/accum_swmr_reader.c
+++ b/test/accum_swmr_reader.c
@@ -23,7 +23,12 @@
 #include "H5VLprivate.h"        /* Virtual Object Layer                     */
 
 /* Filename: this is the same as the define in accum.c used by test_swmr_write_big() */
-#define SWMR_FILENAME "accum_swmr_big.h5"
+const char *FILENAME[] = {
+    "accum",
+    "accum_swmr_big",
+    NULL
+};
+
 
 
 /*-------------------------------------------------------------------------
@@ -47,6 +52,7 @@ main(void)
     hid_t fid = -1;	        /* File ID */
     hid_t fapl = -1;        /* file access property list ID */
     H5F_t *f = NULL;	    /* File pointer */
+    char  filename[1024];
     unsigned u;		        /* Local index variable */
     uint8_t rbuf[1024];	    /* Buffer for reading */
     uint8_t buf[1024];	    /* Buffer for holding the expected data */
@@ -68,10 +74,11 @@ main(void)
 
     if((fapl = h5_fileaccess()) < 0)
         FAIL_STACK_ERROR
+    h5_fixname(FILENAME[1], fapl, filename, sizeof filename);
 
     /* Open the file with SWMR_READ */
-    if((fid = H5Fopen(SWMR_FILENAME, H5F_ACC_RDONLY | H5F_ACC_SWMR_READ, fapl)) < 0)
-	    FAIL_STACK_ERROR
+    if((fid = H5Fopen(filename, H5F_ACC_RDONLY | H5F_ACC_SWMR_READ, fapl)) < 0)
+        FAIL_STACK_ERROR
 
     /* Push API context */
     if(H5CX_push() < 0) FAIL_STACK_ERROR
@@ -79,21 +86,21 @@ main(void)
 
     /* Get H5F_t * to internal file structure */
     if(NULL == (f = (H5F_t *)H5VL_object(fid))) 
-	    FAIL_STACK_ERROR
+        FAIL_STACK_ERROR
 
     /* Should read in [1024, 2024] with buf data */
     if(H5F_block_read(f, H5FD_MEM_DEFAULT, (haddr_t)1024, (size_t)1024, rbuf) < 0)
-	    FAIL_STACK_ERROR;
+        FAIL_STACK_ERROR;
 
     /* Verify the data read is correct */
     if(HDmemcmp(buf, rbuf, (size_t)1024) != 0) 
-	    TEST_ERROR;
+        TEST_ERROR;
 
     /* CLose the file */
     if(H5Pclose(fapl) < 0)
-	    FAIL_STACK_ERROR;
+        FAIL_STACK_ERROR;
     if(H5Fclose(fid) < 0)
-	    FAIL_STACK_ERROR;
+        FAIL_STACK_ERROR;
 
     /* Pop API context */
     if(api_ctx_pushed && H5CX_pop() < 0) FAIL_STACK_ERROR
diff --git a/test/cache_image.c b/test/cache_image.c
index 10e9a8a..10c37f0 100644
--- a/test/cache_image.c
+++ b/test/cache_image.c
@@ -40,27 +40,27 @@ static void attempt_swmr_open_hdf5_file(hbool_t create_file,
 static void verify_datasets(hid_t file_id, int min_dset, int max_dset);
 
 /* local test function declarations */
-static unsigned check_cache_image_ctl_flow_1(void);
-static unsigned check_cache_image_ctl_flow_2(void);
-static unsigned check_cache_image_ctl_flow_3(void);
-static unsigned check_cache_image_ctl_flow_4(void);
-static unsigned check_cache_image_ctl_flow_5(void);
-static unsigned check_cache_image_ctl_flow_6(void);
-
-static unsigned cache_image_smoke_check_1(void);
-static unsigned cache_image_smoke_check_2(void);
-static unsigned cache_image_smoke_check_3(void);
-static unsigned cache_image_smoke_check_4(void);
-static unsigned cache_image_smoke_check_5(void);
-static unsigned cache_image_smoke_check_6(void);
-
-static unsigned cache_image_api_error_check_1(void);
-static unsigned cache_image_api_error_check_2(void);
-static unsigned cache_image_api_error_check_3(void);
-static unsigned cache_image_api_error_check_4(void);
-
-static unsigned get_free_sections_test(void);
-static unsigned evict_on_close_test(void);
+static unsigned check_cache_image_ctl_flow_1(hbool_t single_file_vfd);
+static unsigned check_cache_image_ctl_flow_2(hbool_t single_file_vfd);
+static unsigned check_cache_image_ctl_flow_3(hbool_t single_file_vfd);
+static unsigned check_cache_image_ctl_flow_4(hbool_t single_file_vfd);
+static unsigned check_cache_image_ctl_flow_5(hbool_t single_file_vfd);
+static unsigned check_cache_image_ctl_flow_6(hbool_t single_file_vfd);
+
+static unsigned cache_image_smoke_check_1(hbool_t single_file_vfd);
+static unsigned cache_image_smoke_check_2(hbool_t single_file_vfd);
+static unsigned cache_image_smoke_check_3(hbool_t single_file_vfd);
+static unsigned cache_image_smoke_check_4(hbool_t single_file_vfd);
+static unsigned cache_image_smoke_check_5(hbool_t single_file_vfd);
+static unsigned cache_image_smoke_check_6(hbool_t single_file_vfd);
+
+static unsigned cache_image_api_error_check_1(hbool_t single_file_vfd);
+static unsigned cache_image_api_error_check_2(hbool_t single_file_vfd);
+static unsigned cache_image_api_error_check_3(hbool_t single_file_vfd);
+static unsigned cache_image_api_error_check_4(hbool_t single_file_vfd);
+
+static unsigned get_free_sections_test(hbool_t single_file_vfd);
+static unsigned evict_on_close_test(hbool_t single_file_vfd);
 
 
 /****************************************************************************/
@@ -1329,7 +1329,7 @@ verify_datasets(hid_t file_id, int min_dset, int max_dset)
  */
 
 static unsigned
-check_cache_image_ctl_flow_1(void)
+check_cache_image_ctl_flow_1(hbool_t single_file_vfd)
 {
     const char * fcn_name = "check_cache_image_ctl_flow_1()";
     char filename[512];
@@ -1341,6 +1341,13 @@ check_cache_image_ctl_flow_1(void)
 
     TESTING("metadata cache image control flow test 1");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) 
@@ -1608,7 +1615,7 @@ check_cache_image_ctl_flow_1(void)
  */
 
 static unsigned
-check_cache_image_ctl_flow_2(void)
+check_cache_image_ctl_flow_2(hbool_t single_file_vfd)
 {
     const char * fcn_name = "check_cache_image_ctl_flow_2()";
     char filename[512];
@@ -1620,6 +1627,13 @@ check_cache_image_ctl_flow_2(void)
 
     TESTING("metadata cache image control flow test 2");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) 
@@ -1871,7 +1885,7 @@ check_cache_image_ctl_flow_2(void)
  */
 
 static unsigned
-check_cache_image_ctl_flow_3(void)
+check_cache_image_ctl_flow_3(hbool_t single_file_vfd)
 {
     const char * fcn_name = "check_cache_image_ctl_flow_3()";
     char filename[512];
@@ -1883,6 +1897,13 @@ check_cache_image_ctl_flow_3(void)
 
     TESTING("metadata cache image control flow test 3");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) /* 0 */
@@ -2242,7 +2263,7 @@ check_cache_image_ctl_flow_3(void)
  */
 
 static unsigned
-check_cache_image_ctl_flow_4(void)
+check_cache_image_ctl_flow_4(hbool_t single_file_vfd)
 {
     const char * fcn_name = "check_cache_image_ctl_flow_4()";
     char filename[512];
@@ -2254,6 +2275,13 @@ check_cache_image_ctl_flow_4(void)
 
     TESTING("metadata cache image control flow test 4");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) /* 0 */
@@ -2573,7 +2601,7 @@ check_cache_image_ctl_flow_4(void)
  */
 
 static unsigned
-check_cache_image_ctl_flow_5(void)
+check_cache_image_ctl_flow_5(hbool_t single_file_vfd)
 {
     const char * fcn_name = "check_cache_image_ctl_flow_5()";
     char filename[512];
@@ -2585,6 +2613,13 @@ check_cache_image_ctl_flow_5(void)
 
     TESTING("metadata cache image control flow test 5");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) /* 0 */
@@ -2854,7 +2889,7 @@ check_cache_image_ctl_flow_5(void)
  */
 
 static unsigned
-check_cache_image_ctl_flow_6(void)
+check_cache_image_ctl_flow_6(hbool_t single_file_vfd)
 {
     const char * fcn_name = "check_cache_image_ctl_flow_6()";
     char filename[512];
@@ -2866,6 +2901,13 @@ check_cache_image_ctl_flow_6(void)
 
     TESTING("metadata cache image control flow test 6");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) /* 0 */
@@ -3139,7 +3181,7 @@ check_cache_image_ctl_flow_6(void)
  */
 
 static unsigned
-cache_image_smoke_check_1(void)
+cache_image_smoke_check_1(hbool_t single_file_vfd)
 {
     const char * fcn_name = "cache_image_smoke_check_1()";
     char filename[512];
@@ -3151,6 +3193,13 @@ cache_image_smoke_check_1(void)
 
     TESTING("metadata cache image smoke check 1");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) 
@@ -3562,7 +3611,7 @@ cache_image_smoke_check_1(void)
  */
 
 static unsigned
-cache_image_smoke_check_2(void)
+cache_image_smoke_check_2(hbool_t single_file_vfd)
 {
     const char * fcn_name = "cache_image_smoke_check_2()";
     char filename[512];
@@ -3574,6 +3623,13 @@ cache_image_smoke_check_2(void)
 
     TESTING("metadata cache image smoke check 2");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) 
@@ -3863,7 +3919,7 @@ cache_image_smoke_check_2(void)
  */
 
 static unsigned
-cache_image_smoke_check_3(void)
+cache_image_smoke_check_3(hbool_t single_file_vfd)
 {
     const char * fcn_name = "cache_image_smoke_check_3()";
     char filename[512];
@@ -3875,6 +3931,13 @@ cache_image_smoke_check_3(void)
 
     TESTING("metadata cache image smoke check 3");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) 
@@ -4248,7 +4311,7 @@ cache_image_smoke_check_3(void)
  */
 
 static unsigned
-cache_image_smoke_check_4(void)
+cache_image_smoke_check_4(hbool_t single_file_vfd)
 {
     const char * fcn_name = "cache_image_smoke_check_4()";
     char filename[512];
@@ -4262,6 +4325,13 @@ cache_image_smoke_check_4(void)
 
     TESTING("metadata cache image smoke check 4");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) 
@@ -4653,7 +4723,7 @@ cache_image_smoke_check_4(void)
 #define MAX_NUM_GROUPS 128
 
 static unsigned
-cache_image_smoke_check_5(void)
+cache_image_smoke_check_5(hbool_t single_file_vfd)
 {
     const char * fcn_name = "cache_image_smoke_check_5()";
     char filename[512];
@@ -4670,6 +4740,13 @@ cache_image_smoke_check_5(void)
 
     TESTING("metadata cache image smoke check 5");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) 
@@ -5168,7 +5245,7 @@ cache_image_smoke_check_5(void)
  */
 
 static unsigned
-cache_image_smoke_check_6(void)
+cache_image_smoke_check_6(hbool_t single_file_vfd)
 {
     const char * fcn_name = "cache_image_smoke_check_6()";
     char filename[512];
@@ -5183,6 +5260,13 @@ cache_image_smoke_check_6(void)
 
     TESTING("metadata cache image smoke check 6");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) 
@@ -5578,7 +5662,7 @@ cache_image_smoke_check_6(void)
  */
 
 static unsigned
-cache_image_api_error_check_1(void)
+cache_image_api_error_check_1(hbool_t single_file_vfd)
 {
     const char * fcn_name = "cache_image_api_error_check_1()";
     char filename[512];
@@ -5590,6 +5674,13 @@ cache_image_api_error_check_1(void)
 
     TESTING("metadata cache image api error check 1");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) 
@@ -5954,7 +6045,7 @@ cache_image_api_error_check_1(void)
  */
 
 static unsigned
-cache_image_api_error_check_2(void)
+cache_image_api_error_check_2(hbool_t single_file_vfd)
 {
     const char * fcn_name = "cache_image_api_error_check_2()";
     char filename[512];
@@ -5966,6 +6057,13 @@ cache_image_api_error_check_2(void)
 
     TESTING("metadata cache image api error check 2");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) 
@@ -6365,7 +6463,7 @@ cache_image_api_error_check_2(void)
  */
 
 static unsigned
-cache_image_api_error_check_3(void)
+cache_image_api_error_check_3(hbool_t single_file_vfd)
 {
     const char * fcn_name = "cache_image_api_error_check_3()";
     char filename[512];
@@ -6377,6 +6475,13 @@ cache_image_api_error_check_3(void)
 
     TESTING("metadata cache image api error check 3");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) 
@@ -6649,7 +6754,7 @@ cache_image_api_error_check_3(void)
  */
 
 static unsigned
-cache_image_api_error_check_4(void)
+cache_image_api_error_check_4(hbool_t single_file_vfd)
 {
     const char * fcn_name = "cache_image_api_error_check_4()";
     char filename[512];
@@ -6663,6 +6768,13 @@ cache_image_api_error_check_4(void)
 
     TESTING("metadata cache image api error check 4");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) 
@@ -7238,7 +7350,7 @@ cache_image_api_error_check_4(void)
  *-------------------------------------------------------------------------
  */
 static unsigned
-get_free_sections_test(void)
+get_free_sections_test(hbool_t single_file_vfd)
 {
     const char * fcn_name = "get_free_sections_test()";
     char filename[512];
@@ -7251,6 +7363,13 @@ get_free_sections_test(void)
 
     TESTING("Cache image / H5Fget_free_sections() interaction");
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) 
@@ -7710,7 +7829,7 @@ get_free_sections_test(void)
  *-------------------------------------------------------------------------
  */
 static unsigned
-evict_on_close_test(void)
+evict_on_close_test(hbool_t single_file_vfd)
 {
 #ifndef H5_HAVE_PARALLEL
     const char * fcn_name = "evict_on_close_test()";
@@ -7731,6 +7850,13 @@ evict_on_close_test(void)
     return 0;
 #else
 
+    /* Check for VFD that is a single file */
+    if(!single_file_vfd) {
+        SKIPPED();
+        HDputs("    Cache image not supported with the current VFD.");
+        return 0;
+    }
+
     pass = TRUE;
 
     if ( show_progress ) 
@@ -8041,9 +8167,16 @@ evict_on_close_test(void)
 int
 main(void)
 {
+    const char  *env_h5_drvr;   /* File driver value from environment */
+    hbool_t single_file_vfd;    /* Whether VFD used stores data in a single file */
     unsigned nerrs = 0;
     int express_test;
 
+    /* Get the VFD to use */
+    env_h5_drvr = HDgetenv("HDF5_DRIVER");
+    if(env_h5_drvr == NULL)
+        env_h5_drvr = "nomatch";
+
     H5open();
 
     express_test = GetTestExpress();
@@ -8053,27 +8186,30 @@ main(void)
     printf("        express_test = %d\n", express_test);
     printf("=========================================\n");
 
-    nerrs += check_cache_image_ctl_flow_1();
-    nerrs += check_cache_image_ctl_flow_2();
-    nerrs += check_cache_image_ctl_flow_3();
-    nerrs += check_cache_image_ctl_flow_4();
-    nerrs += check_cache_image_ctl_flow_5();
-    nerrs += check_cache_image_ctl_flow_6();
-
-    nerrs += cache_image_smoke_check_1();
-    nerrs += cache_image_smoke_check_2();
-    nerrs += cache_image_smoke_check_3();
-    nerrs += cache_image_smoke_check_4();
-    nerrs += cache_image_smoke_check_5();
-    nerrs += cache_image_smoke_check_6();
-
-    nerrs += cache_image_api_error_check_1();
-    nerrs += cache_image_api_error_check_2();
-    nerrs += cache_image_api_error_check_3();
-    nerrs += cache_image_api_error_check_4();
-
-    nerrs += get_free_sections_test();
-    nerrs += evict_on_close_test();
+    /* Check for VFD which stores data in multiple files */
+    single_file_vfd = (hbool_t)(HDstrcmp(env_h5_drvr, "split") && HDstrcmp(env_h5_drvr, "multi") && HDstrcmp(env_h5_drvr, "family"));
+
+    nerrs += check_cache_image_ctl_flow_1(single_file_vfd);
+    nerrs += check_cache_image_ctl_flow_2(single_file_vfd);
+    nerrs += check_cache_image_ctl_flow_3(single_file_vfd);
+    nerrs += check_cache_image_ctl_flow_4(single_file_vfd);
+    nerrs += check_cache_image_ctl_flow_5(single_file_vfd);
+    nerrs += check_cache_image_ctl_flow_6(single_file_vfd);
+
+    nerrs += cache_image_smoke_check_1(single_file_vfd);
+    nerrs += cache_image_smoke_check_2(single_file_vfd);
+    nerrs += cache_image_smoke_check_3(single_file_vfd);
+    nerrs += cache_image_smoke_check_4(single_file_vfd);
+    nerrs += cache_image_smoke_check_5(single_file_vfd);
+    nerrs += cache_image_smoke_check_6(single_file_vfd);
+
+    nerrs += cache_image_api_error_check_1(single_file_vfd);
+    nerrs += cache_image_api_error_check_2(single_file_vfd);
+    nerrs += cache_image_api_error_check_3(single_file_vfd);
+    nerrs += cache_image_api_error_check_4(single_file_vfd);
+
+    nerrs += get_free_sections_test(single_file_vfd);
+    nerrs += evict_on_close_test(single_file_vfd);
 
     return(nerrs > 0);
 
diff --git a/test/cache_tagging.c b/test/cache_tagging.c
index 752dd27..b91f013 100644
--- a/test/cache_tagging.c
+++ b/test/cache_tagging.c
@@ -448,7 +448,7 @@ check_file_creation_tags(hid_t fcpl_id, int type)
     TESTING("tag application during file creation");
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create a test file with provided fcpl_t */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, fapl)) < 0 ) TEST_ERROR;
@@ -539,7 +539,7 @@ check_file_open_tags(hid_t fcpl, int type)
     /* ===== */
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create a test file with provided fcpl_t */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl, fapl)) < 0 ) TEST_ERROR;
@@ -652,7 +652,7 @@ check_group_creation_tags(void)
     /* ===== */
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create a test file with provided fcpl_t */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0 ) TEST_ERROR;
@@ -751,7 +751,7 @@ check_multi_group_creation_tags(void)
     TESTING("tag application during multiple group creation");
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Set latest version of library */
     if ( H5Pset_libver_bounds(fapl, H5F_LIBVER_LATEST, H5F_LIBVER_LATEST) < 0 ) TEST_ERROR;
@@ -881,7 +881,7 @@ check_link_iteration_tags(void)
     TESTING("tag application during iteration over links in a group");
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* =========== */
     /* Create File */
@@ -1000,7 +1000,7 @@ check_dense_attribute_tags(void)
     TESTING("tag application during dense attribute manipulation");
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
     if ( H5Pset_libver_bounds(fapl, H5F_LIBVER_LATEST, H5F_LIBVER_LATEST) < 0 ) TEST_ERROR;
 
     /* Create Dcpl */
@@ -1184,7 +1184,7 @@ check_group_open_tags(void)
     /* ===== */
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create a test file with provided fcpl_t */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0 ) TEST_ERROR;
@@ -1295,7 +1295,7 @@ check_attribute_creation_tags(hid_t fcpl, int type)
     /* ===== */
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create a test file with provided fcpl_t */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl, fapl)) < 0 ) TEST_ERROR;
@@ -1429,7 +1429,7 @@ check_attribute_open_tags(hid_t fcpl, int type)
     /* ===== */
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create a test file with provided fcpl_t */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl, fapl)) < 0 ) TEST_ERROR;
@@ -1576,7 +1576,7 @@ check_attribute_rename_tags(hid_t fcpl, int type)
     if ( (NULL == (data = (int *)HDcalloc(DIMS * DIMS, sizeof(int)))) ) TEST_ERROR;
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create a test file with provided fcpl_t */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl, fapl)) < 0 ) TEST_ERROR;
@@ -1761,7 +1761,7 @@ check_attribute_delete_tags(hid_t fcpl, int type)
     if ( (NULL == (data = (int *)HDcalloc(DIMS * DIMS, sizeof(int)))) ) TEST_ERROR;
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create a test file with provided fcpl_t */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl, fapl)) < 0 ) TEST_ERROR;
@@ -1917,7 +1917,7 @@ check_dataset_creation_tags(hid_t fcpl, int type)
     /* ===== */
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl, fapl)) < 0 ) TEST_ERROR;
 
@@ -2051,7 +2051,7 @@ check_dataset_creation_earlyalloc_tags(hid_t fcpl, int type)
     /* ===== */
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl, fapl)) < 0 ) TEST_ERROR;
 
@@ -2187,7 +2187,7 @@ check_dataset_open_tags(void)
     /* ========= */
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create file */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0 ) TEST_ERROR;
@@ -2318,7 +2318,7 @@ check_dataset_write_tags(void)
     if ( (NULL == (data = (int *)HDcalloc(DIMS * DIMS, sizeof(int)))) ) TEST_ERROR;
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create file */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0 ) TEST_ERROR;
@@ -2457,7 +2457,7 @@ check_attribute_write_tags(hid_t fcpl, int type)
     if ( (NULL == (data = (int *)HDcalloc(DIMS * DIMS, sizeof(int)))) ) TEST_ERROR;
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create a test file with provided fcpl_t */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl, fapl)) < 0 ) TEST_ERROR;
@@ -2613,7 +2613,7 @@ check_dataset_read_tags(void)
     if ( (NULL == (data = (int *)HDcalloc(DIMS * DIMS, sizeof(int)))) ) TEST_ERROR;
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create file */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0 ) TEST_ERROR;
@@ -2751,7 +2751,7 @@ check_dataset_size_retrieval(void)
     if ( (NULL == (data = (int *)HDcalloc(DIMS * DIMS, sizeof(int)))) ) TEST_ERROR;
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create file */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0 ) TEST_ERROR;
@@ -2890,7 +2890,7 @@ check_dataset_extend_tags(void)
     if ( (NULL == (data = (int *)HDcalloc(DIMS * DIMS, sizeof(int)))) ) TEST_ERROR;
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create file */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0 ) TEST_ERROR;
@@ -3017,7 +3017,7 @@ check_object_info_tags(void)
     /* ===== */
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create a test file */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0 ) TEST_ERROR;
@@ -3126,7 +3126,7 @@ check_object_copy_tags(void)
     /* ===== */
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create a test file */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0 ) TEST_ERROR;
@@ -3257,7 +3257,7 @@ check_link_removal_tags(hid_t fcpl, int type)
     if ( (NULL == (data = (int *)HDcalloc(DIMS * DIMS, sizeof(int)))) ) TEST_ERROR;
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create file */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl, fapl)) < 0 ) TEST_ERROR;
@@ -3416,7 +3416,7 @@ check_link_getname_tags(void)
     if ( (NULL == (data = (int *)HDcalloc(DIMS * DIMS, sizeof(int)))) ) TEST_ERROR;
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create file */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0 ) TEST_ERROR;
@@ -3553,7 +3553,7 @@ check_external_link_creation_tags(void)
     /* ===== */
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create a test file */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0 ) TEST_ERROR;
@@ -3660,7 +3660,7 @@ check_external_link_open_tags(void)
     /* ===== */
 
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create a test file */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0 ) TEST_ERROR;
@@ -3671,8 +3671,6 @@ check_external_link_open_tags(void)
     /* Create a second file */
     if ( (fid2 = H5Fcreate(FILENAME2, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0 ) TEST_ERROR;
 
-    if ( H5Pclose(fapl) < 0 ) TEST_ERROR;
-
     /* determine tag value of root group's object header */
     if ( get_object_header_tag(fid2, &root2_tag) < 0 ) TEST_ERROR;
 
@@ -3688,7 +3686,9 @@ check_external_link_open_tags(void)
 
     /* Close and Reopen the file */
     if ( H5Fclose(fid) < 0 ) TEST_ERROR;
-    if ( (fid = H5Fopen(FILENAME, H5F_ACC_RDWR, H5P_DEFAULT)) < 0 ) TEST_ERROR;
+    if ( (fid = H5Fopen(FILENAME, H5F_ACC_RDWR, fapl)) < 0 ) TEST_ERROR;
+
+    if ( H5Pclose(fapl) < 0 ) TEST_ERROR;
 
     /* Evict as much as we can from the cache so we can track full tag path */
     if ( evict_entries(fid) < 0 ) TEST_ERROR;
@@ -3787,7 +3787,7 @@ check_invalid_tag_application(void)
     
 #if H5C_DO_TAGGING_SANITY_CHECKS
     /* Create Fapl */
-    if ( (fapl = h5_fileaccess()) < 0 ) TEST_ERROR;
+    if ( (fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0 ) TEST_ERROR;
 
     /* Create a test file */
     if ( (fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0 ) TEST_ERROR;
diff --git a/test/cmpd_dset.c b/test/cmpd_dset.c
index b011bc2..a8baeac 100644
--- a/test/cmpd_dset.c
+++ b/test/cmpd_dset.c
@@ -2070,7 +2070,7 @@ test_ooo_order(char *filename, hid_t fapl_id)
     /* Close and reopen the file */
     if(H5Tclose(dtype)) TEST_ERROR
     if(H5Fclose(file)) TEST_ERROR
-    if((file = H5Fopen(filename, H5F_ACC_RDWR, H5P_DEFAULT)) < 0) TEST_ERROR
+    if((file = H5Fopen(filename, H5F_ACC_RDWR, fapl_id)) < 0) TEST_ERROR
 
     /* Open the type */
     if((dtype_tmp = H5Topen2(file, "dtype", H5P_DEFAULT)) < 0) TEST_ERROR
@@ -2123,7 +2123,7 @@ test_ooo_order(char *filename, hid_t fapl_id)
     if(H5Tclose(dtype_tmp)) TEST_ERROR
     if(H5Tclose(dtype)) TEST_ERROR
     if(H5Fclose(file)) TEST_ERROR
-    if((file = H5Fopen(filename, H5F_ACC_RDONLY, H5P_DEFAULT)) < 0) TEST_ERROR
+    if((file = H5Fopen(filename, H5F_ACC_RDONLY, fapl_id)) < 0) TEST_ERROR
 
     /* Open the type, and verify status */
     if((dtype_tmp = H5Topen2(file, "dtype2", H5P_DEFAULT)) < 0) TEST_ERROR
diff --git a/test/del_many_dense_attrs.c b/test/del_many_dense_attrs.c
new file mode 100644
index 0000000..d88045c
--- /dev/null
+++ b/test/del_many_dense_attrs.c
@@ -0,0 +1,203 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Purpose:	Test to verify that the infinite loop closing library/abort failure
+ *          is fixed when the application creates and removes dense attributes 
+ *          (See HDFFV-10659).
+ */
+
+
+#include "h5test.h"
+
+/* The test file name */
+const char *FILENAME[] = {
+    "del_many_dense_attrs", 
+    NULL
+};
+
+#define ATTR_COUNT  64          /* The number of attributes */
+
+/*-------------------------------------------------------------------------
+ * Function:    catch_signal
+ *
+ * Purpose:     The signal handler to catch the SIGABRT signal.
+ *
+ * Return:      No return
+ *
+ * Programmer:  Vailin Choi
+ *
+ *-------------------------------------------------------------------------
+ */
+static void catch_signal(int H5_ATTR_UNUSED signo)
+{
+    HDexit(1);
+} /* catch_signal() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:	main
+ *
+ * Purpose:	Test to verify that the infinite loop closing library/abort failure
+ *          is fixed when the application creates and removes dense attributes 
+ *          (See HDFFV-10659).
+ *
+ * Return:	Success:	exit(EXIT_SUCCESS)
+ *		    Failure:	exit(EXIT_FAILURE)
+ *
+ * Programmer:  Vailin Choi; Dec 2018
+ *
+ *-------------------------------------------------------------------------
+ */
+int
+main(void)
+{
+    hid_t fid = -1;             /* HDF5 File ID                 */
+    hid_t gid = -1;             /* Group ID                     */
+    hid_t sid = -1;             /* Dataspace ID                 */
+    hid_t aid = -1;             /* Attribute ID                 */
+    hid_t tid = -1;             /* Datatype ID                  */
+    hid_t fapl = -1;            /* File access property lists   */
+    hid_t gcpl = -1;            /* Group creation property list */
+    char aname[50];             /* Name of attribute            */
+    char *basename="attr";      /* Name prefix for attribute    */
+    char filename[100];         /* File name                    */
+    int i;                      /* Local index variable         */
+
+    /* Testing setup */
+    h5_reset();
+
+    /* To exit from the file for SIGABRT signal */
+    if(HDsignal(SIGABRT, catch_signal) == SIG_ERR)
+       TEST_ERROR
+
+    fapl = h5_fileaccess();
+    h5_fixname(FILENAME[0], fapl, filename, sizeof(filename));
+
+    /* Set to latest format */
+    if(H5Pset_libver_bounds(fapl, H5F_LIBVER_LATEST, H5F_LIBVER_LATEST) < 0)
+        TEST_ERROR
+
+    /* Create the file  */
+    if((fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0)
+        TEST_ERROR
+
+    /* Close the file */
+    if(H5Fclose(fid) < 0)
+        TEST_ERROR
+
+     /* Re-open the file */
+    if((fid = H5Fopen(filename, H5F_ACC_RDWR, fapl)) < 0)
+        TEST_ERROR
+
+    /* Create the group creation property list */
+    if((gcpl = H5Pcreate(H5P_GROUP_CREATE)) < 0)
+        TEST_ERROR
+
+    /* Set to use dense storage for all attributes on the group */
+    if(H5Pset_attr_phase_change(gcpl, 0, 0) < 0)
+        TEST_ERROR
+
+    /* Create the group in the file */
+    if((gid = H5Gcreate2(fid, "group", H5P_DEFAULT, gcpl, H5P_DEFAULT)) < 0)
+        TEST_ERROR
+
+    /* Create dataspace */
+    if((sid = H5Screate(H5S_SCALAR)) < 0)
+        TEST_ERROR
+
+    /* Get a copy of the datatype */
+    if((tid = H5Tcopy(H5T_NATIVE_FLOAT)) < 0)
+        TEST_ERROR
+
+    /* Create attributes in the group */
+    for(i = ATTR_COUNT; i >= 0; i--) {
+        /* Set up the attribute name */
+        HDsprintf(aname, "%s%d", basename, i);
+
+        /* Create the attribute */
+        if((aid = H5Acreate2(gid, aname, tid, sid, H5P_DEFAULT, H5P_DEFAULT)) < 0)
+            TEST_ERROR
+
+        /* Write to the attribute */
+        if(H5Awrite(aid, tid, &i) < 0)
+            TEST_ERROR
+
+        /* Close the attribute */
+        if(H5Aclose(aid) < 0)
+            TEST_ERROR
+    }
+    
+    /* Close the datatype */
+    if(H5Tclose(tid) < 0)
+       TEST_ERROR
+
+    /* Close the dataspace */
+    if(H5Sclose(sid) < 0)
+        TEST_ERROR
+
+    /* Close the group */
+    if(H5Gclose(gid) < 0)
+        TEST_ERROR
+
+    /* Close the group creation property list */
+    if(H5Pclose(gcpl) < 0)
+        TEST_ERROR
+
+    /* Close the file */
+    if(H5Fclose(fid) < 0)
+        TEST_ERROR
+
+    /* Re-open the file */
+    if((fid = H5Fopen(filename, H5F_ACC_RDWR, fapl)) < 0)
+        TEST_ERROR
+
+    /* Open the group */
+    if((gid = H5Gopen2(fid, "group", H5P_DEFAULT)) < 0)
+        TEST_ERROR
+
+    /* Delete the attributes */
+    for (i = 0; i <= ATTR_COUNT; i++) {
+        /* Set up the attribute name */
+        HDsprintf(aname, "%s%d", basename, i);
+
+        /* Delete the attribute */
+        if(H5Adelete(gid, aname) < 0)
+            TEST_ERROR
+    } /* end for */
+
+    /* Close the group */
+    if(H5Gclose(gid) < 0)
+        TEST_ERROR
+
+    /* Close the file */
+    if(H5Fclose(fid) < 0)
+        TEST_ERROR
+
+    h5_cleanup(FILENAME, fapl);
+
+    return(EXIT_SUCCESS);
+
+error:
+    H5E_BEGIN_TRY {
+        H5Gclose(gid);
+        H5Sclose(sid);
+        H5Tclose(tid);
+        H5Aclose(aid);
+        H5Fclose(fid);
+        H5Pclose(gcpl);
+        H5Pclose(fapl);
+    } H5E_END_TRY
+
+    return EXIT_FAILURE;
+}
diff --git a/test/dsets.c b/test/dsets.c
index 5cd376a..5de9cfa 100644
--- a/test/dsets.c
+++ b/test/dsets.c
@@ -86,6 +86,9 @@ const char *FILENAME[] = {
     NULL
 };
 
+#define OHMIN_FILENAME_A "ohdr_min_a"
+
+
 #define FILENAME_BUF_SIZE       1024
 #define KB                      1024
 
@@ -338,7 +341,7 @@ filter_count(unsigned int flags, size_t H5_ATTR_UNUSED cd_nelmts,
         count_nbytes_written += nbytes;
 
     return nbytes;
-}
+} /* end filter_count() */
 
 
 /*-------------------------------------------------------------------------
@@ -481,11 +484,11 @@ test_create(hid_t file)
     if(H5Dclose(dataset) < 0) goto error;
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
  error:
-    return -1;
-}
+    return FAIL;
+} /* end test_create() */
 
 
 /*-------------------------------------------------------------------------
@@ -605,7 +608,7 @@ test_simple_io(const char *env_h5_drvr, hid_t fapl)
         puts("    Current VFD doesn't support continuous address space");
     } /* end else */
 
-    return 0;
+    return SUCCEED;
 
 error:
     if(space > 0)
@@ -620,8 +623,8 @@ error:
         HDclose(f);
     if(tconv_buf)
         HDfree(tconv_buf);
-    return -1;
-}
+    return FAIL;
+} /* end test_simple_io() */
 
 
 /*-------------------------------------------------------------------------
@@ -713,7 +716,7 @@ test_userblock_offset(const char *env_h5_drvr, hid_t fapl, hbool_t new_format)
         puts("    Current VFD doesn't support continuous address space");
     } /* end else */
 
-    return 0;
+    return SUCCEED;
 
 error:
     if(space > 0)
@@ -726,8 +729,8 @@ error:
         if(H5Fclose(file) < 0) TEST_ERROR
     if(f > 0)
         HDclose(f);
-    return -1;
-}
+    return FAIL;
+} /* end test_userblock_offset() */
 
 
 /*-------------------------------------------------------------------------
@@ -826,7 +829,7 @@ test_compact_io(hid_t fapl)
      **************************************/
 
     /* Create a copy of file access property list */
-    if((new_fapl = new_fapl = h5_fileaccess()) < 0) TEST_ERROR
+    if((new_fapl = h5_fileaccess()) < 0) TEST_ERROR
 
     /* Loop through all the combinations of low/high library format bounds,
        skipping invalid combinations.
@@ -907,7 +910,7 @@ test_compact_io(hid_t fapl)
     if(H5Pclose(plist) < 0) TEST_ERROR
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
  error:
     H5E_BEGIN_TRY {
@@ -919,8 +922,8 @@ test_compact_io(hid_t fapl)
         H5Fclose(verfile);
     } H5E_END_TRY;
 
-    return -1;
-}
+    return FAIL;
+} /* end test_compact_io() */
 
 
 /*-------------------------------------------------------------------------
@@ -1056,7 +1059,7 @@ test_max_compact(hid_t fapl)
          FAIL_STACK_ERROR
 
      PASSED();
-     return 0;
+     return SUCCEED;
 
 error:
     if(wbuf)
@@ -1072,7 +1075,7 @@ error:
         H5Fclose(file);
     } H5E_END_TRY;
 
-     return -1;
+     return FAIL;
 } /* end test_max_compact() */
 
 
@@ -1181,7 +1184,7 @@ test_layout_extend(hid_t fapl)
     if(H5Fclose(fid) < 0) FAIL_STACK_ERROR
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -1195,7 +1198,7 @@ error:
         H5Fclose(fid);
     } H5E_END_TRY;
 
-     return -1;
+     return FAIL;
 } /* end test_layout_extend() */
 
 
@@ -1331,7 +1334,7 @@ test_conv_buffer(hid_t fid)
   HDfree(cf);
   HDfree(cfrR);
   puts(" PASSED");
-  return 0;
+  return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -1347,8 +1350,8 @@ error:
         H5Dclose(dataset);
     } H5E_END_TRY;
 
-  return -1;
-}
+  return FAIL;
+} /* end test_conv_buffer() */
 
 
 /*-------------------------------------------------------------------------
@@ -1418,7 +1421,7 @@ test_tconv(hid_t file)
     HDfree(in);
 
     puts(" PASSED");
-    return 0;
+    return SUCCEED;
 
 error:
     if(out)
@@ -1431,8 +1434,8 @@ error:
         H5Sclose(space);
     } H5E_END_TRY;
 
-    return -1;
-}
+    return FAIL;
+} /* end test_tconv() */
 
 /* This message derives from H5Z */
 const H5Z_class2_t H5Z_BOGUS[1] = {{
@@ -1465,7 +1468,7 @@ can_apply_bogus(hid_t H5_ATTR_UNUSED dcpl_id, hid_t type_id, hid_t H5_ATTR_UNUSE
         return 1;
     else
         return -1;
-}
+} /* end can_apply_bogus() */
 
 
 /*-------------------------------------------------------------------------
@@ -1483,7 +1486,7 @@ filter_bogus(unsigned int H5_ATTR_UNUSED flags, size_t H5_ATTR_UNUSED cd_nelmts,
       size_t H5_ATTR_UNUSED *buf_size, void H5_ATTR_UNUSED **buf)
 {
     return nbytes;
-}
+} /* end filter_bogus() */
 
 
 /*-------------------------------------------------------------------------
@@ -1583,7 +1586,7 @@ filter_bogus2(unsigned int flags, size_t cd_nelmts,
     /* Filter is "no op" */
     else
         return(nbytes);
-}
+} /* end filter_bogus2() */
 
 
 /*-------------------------------------------------------------------------
@@ -1601,7 +1604,7 @@ filter_bogus3(unsigned int H5_ATTR_UNUSED flags, size_t H5_ATTR_UNUSED cd_nelmts
       size_t H5_ATTR_UNUSED *buf_size, void H5_ATTR_UNUSED **buf)
 {
     return 0;
-}
+} /* end filter_bogus3() */
 
 /* This message derives from H5Z */
 const H5Z_class2_t H5Z_CORRUPT[1] = {{
@@ -1690,7 +1693,7 @@ filter_cb_cont(H5Z_filter_t filter, void H5_ATTR_UNUSED *buf, size_t H5_ATTR_UNU
        return H5Z_CB_CONT;
     else
         return H5Z_CB_FAIL;
-}
+} /* end filter_cb_cont() */
 
 
 /*-------------------------------------------------------------------------
@@ -1709,7 +1712,7 @@ filter_cb_fail(H5Z_filter_t filter, void H5_ATTR_UNUSED *buf, size_t H5_ATTR_UNU
        return H5Z_CB_FAIL;
     else
        return H5Z_CB_CONT;
-}
+} /* end filter_cb_fail() */
 
 
 /*-------------------------------------------------------------------------
@@ -2052,13 +2055,13 @@ test_filter_internal(hid_t fid, const char *name, hid_t dcpl, int if_fletcher32,
     if(H5Pclose (write_dxpl) < 0) goto error;
     HDfree (tconv_buf);
 
-    return(0);
+    return SUCCEED;
 
 error:
     if(tconv_buf)
         HDfree (tconv_buf);
-    return -1;
-}
+    return FAIL;
+} /* end test_filter_internal() */
 
 /*-------------------------------------------------------------------------
  * Function:  test_filter_noencoder
@@ -2160,7 +2163,7 @@ test_filter_noencoder(const char *dset_name)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5_FAILED();
@@ -2175,8 +2178,8 @@ error:
     if(file_id != -1)
         H5Fclose(file_id);
 
-    return -1;
-}
+    return FAIL;
+} /* end test_filter_noencoder() */
 #endif /* H5_HAVE_FILTER_SZIP */
 
 /*-------------------------------------------------------------------------
@@ -2242,11 +2245,11 @@ test_get_filter_info(void)
   if(err >= 0) TEST_ERROR
 
   PASSED();
-  return 0;
+  return SUCCEED;
 
 error:
-  return -1;
-}
+  return FAIL;
+} /* end test_get_filter_info() */
 
 /*-------------------------------------------------------------------------
  * Function:  test_filters
@@ -2517,11 +2520,11 @@ H5_ATTR_UNUSED
     SKIPPED();
     puts("    szip filter not enabled");
 #endif /* H5_HAVE_FILTER_SZIP */
-    return 0;
+    return SUCCEED;
 
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_filters() */
 
 
 /*-------------------------------------------------------------------------
@@ -2856,11 +2859,11 @@ test_onebyte_shuffle(hid_t file)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_onebyte_shuffle() */
 
 
 /*-------------------------------------------------------------------------
@@ -2974,11 +2977,11 @@ test_nbit_int(hid_t file)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_nbit_int() */
 
 
 /*-------------------------------------------------------------------------
@@ -3092,11 +3095,11 @@ test_nbit_float(hid_t file)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_nbit_float() */
 
 
 /*-------------------------------------------------------------------------
@@ -3224,11 +3227,11 @@ test_nbit_double(hid_t file)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_nbit_double() */
 
 
 /*-------------------------------------------------------------------------
@@ -3351,11 +3354,11 @@ test_nbit_array(hid_t file)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_nbit_array() */
 
 
 /*-------------------------------------------------------------------------
@@ -3568,11 +3571,11 @@ test_nbit_compound(hid_t file)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_nbit_compound() */
 
 
 /*-------------------------------------------------------------------------
@@ -3913,11 +3916,11 @@ out:
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_nbit_compound_2() */
 
 
 /*-------------------------------------------------------------------------
@@ -4093,11 +4096,11 @@ test_nbit_compound_3(hid_t file)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_nbit_compound_3() */
 
 
 /*-------------------------------------------------------------------------
@@ -4261,10 +4264,10 @@ test_nbit_int_size(hid_t file)
 
     PASSED();
 
-   return 0;
+   return SUCCEED;
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_nbit_int_size() */
 
 
 /*-------------------------------------------------------------------------
@@ -4458,10 +4461,10 @@ test_nbit_flt_size(hid_t file)
 
     PASSED();
 
-   return 0;
+   return SUCCEED;
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_nbit_flt_size() */
 
 /*-------------------------------------------------------------------------
  * Function:    test_scaleoffset_int
@@ -4569,10 +4572,10 @@ test_scaleoffset_int(hid_t file)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_scaleoffset_int() */
 
 
 /*-------------------------------------------------------------------------
@@ -4697,10 +4700,10 @@ test_scaleoffset_int_2(hid_t file)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_scaleoffset_int_2() */
 
 
 /*-------------------------------------------------------------------------
@@ -4810,10 +4813,10 @@ test_scaleoffset_float(hid_t file)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_scaleoffset_float() */
 
 
 /*-------------------------------------------------------------------------
@@ -4939,10 +4942,10 @@ test_scaleoffset_float_2(hid_t file)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_scaleoffset_float_2() */
 
 
 /*-------------------------------------------------------------------------
@@ -5052,10 +5055,10 @@ test_scaleoffset_double(hid_t file)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_scaleoffset_double() */
 
 
 /*-------------------------------------------------------------------------
@@ -5182,10 +5185,10 @@ test_scaleoffset_double_2(hid_t file)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 error:
-    return -1;
-}
+    return FAIL;
+} /* end test_scaleoffset_double_2() */
 
 
 /*-------------------------------------------------------------------------
@@ -5242,17 +5245,17 @@ test_multiopen (hid_t file)
     if(H5Pclose(dcpl) < 0) goto error;
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
  error:
     H5E_BEGIN_TRY {
-    H5Dclose(dset1);
-    H5Dclose(dset2);
-    H5Sclose(space);
-    H5Pclose(dcpl);
+        H5Dclose(dset1);
+        H5Dclose(dset2);
+        H5Sclose(space);
+        H5Pclose(dcpl);
     } H5E_END_TRY;
-    return -1;
-}
+    return FAIL;
+} /* end test_multiopen() */
 
 
 /*-------------------------------------------------------------------------
@@ -5338,7 +5341,7 @@ test_types(hid_t file)
     /* Cleanup */
     if(H5Gclose(grp) < 0) goto error;
     PASSED();
-    return 0;
+    return SUCCEED;
 
  error:
     H5E_BEGIN_TRY {
@@ -5347,8 +5350,8 @@ test_types(hid_t file)
     H5Sclose(space);
     H5Dclose(dset);
     } H5E_END_TRY;
-    return -1;
-}
+    return FAIL;
+} /* end test_types() */
 
 /* This message derives from H5Z */
 const H5Z_class2_t H5Z_CAN_APPLY_TEST[1] = {{
@@ -5525,10 +5528,10 @@ test_can_apply(hid_t file)
 
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
-    return -1;
+    return FAIL;
 } /* end test_can_apply() */
 
 /* This message derives from H5Z */
@@ -5684,10 +5687,10 @@ test_can_apply2(hid_t file)
 
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
-    return -1;
+    return FAIL;
 } /* end test_can_apply2() */
 
 
@@ -5876,11 +5879,11 @@ file)
     SKIPPED();
     puts("    Szip filter is not enabled.");
 #endif /* H5_HAVE_FILTER_SZIP */
-    return 0;
+    return SUCCEED;
 
 #ifdef H5_HAVE_FILTER_SZIP
 error:
-    return -1;
+    return FAIL;
 #endif /* H5_HAVE_FILTER_SZIP */
 } /* end test_can_apply_szip() */
 
@@ -6155,10 +6158,10 @@ test_set_local(hid_t fapl)
 
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
-    return -1;
+    return FAIL;
 } /* end test_set_local() */
 
 
@@ -6233,7 +6236,7 @@ test_compare_dcpl(hid_t file)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -6243,7 +6246,7 @@ error:
         H5Pclose(dcpl1);
         H5Pclose(dcpl2);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_compare_dcpl() */
 
 
@@ -6360,7 +6363,7 @@ test_copy_dcpl(hid_t file, hid_t fapl)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -6375,7 +6378,7 @@ error:
         H5Pclose(dcpl1_copy);
         H5Pclose(dcpl2_copy);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_copy_dcpl() */
 
 
@@ -6492,7 +6495,7 @@ test_filter_delete(hid_t file)
 #else
     SKIPPED();
 #endif
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -6501,7 +6504,7 @@ error:
         H5Dclose(dsid);
         H5Sclose(sid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_filter_delete() */
 
 
@@ -6574,7 +6577,7 @@ auxread_fdata(hid_t fid, const char *name)
     if(buf)
         HDfree(buf);
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -6586,8 +6589,8 @@ error:
         if(buf)
             HDfree(buf);
     } H5E_END_TRY;
-    return -1;
-}
+    return FAIL;
+} /* end auxread_fdata() */
 
 
 /*-------------------------------------------------------------------------
@@ -6647,7 +6650,7 @@ test_filters_endianess(void)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -6656,7 +6659,7 @@ error:
         H5Sclose(sid);
         H5Fclose(fid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_filters_endianess() */
 
 
@@ -6806,7 +6809,7 @@ test_zero_dims(hid_t file)
     if(H5Sclose(s2) < 0) FAIL_STACK_ERROR
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -6820,7 +6823,7 @@ error:
         H5Dclose(d2);
         H5Sclose(s2);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_zero_dims() */
 
 
@@ -6999,7 +7002,7 @@ test_missing_chunk(hid_t file)
     if(H5Dclose(did2) < 0) TEST_ERROR;
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -7012,7 +7015,7 @@ error:
         H5Sclose(s);
         H5Sclose(sid2);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_missing_chunk() */
 
 
@@ -7370,7 +7373,7 @@ test_random_chunks_real(const char *testname, hbool_t early_alloc, hid_t fapl)
     if(H5Fclose(file) < 0) TEST_ERROR;
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -7380,7 +7383,7 @@ error:
         H5Dclose(d);
         H5Fclose(file);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_random_chunks_real() */
 
 
@@ -7627,10 +7630,10 @@ test_deprec(hid_t file)
 
     if(H5Pclose(dcpl) < 0) goto error;
 
-    return 0;
+    return SUCCEED;
 
  error:
-    return -1;
+    return FAIL;
 } /* end test_deprec() */
 #endif /* H5_NO_DEPRECATED_SYMBOLS */
 
@@ -7734,7 +7737,7 @@ test_huge_chunks(hid_t fapl)
     if(H5Fclose(fid) < 0) FAIL_STACK_ERROR
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -7743,7 +7746,7 @@ error:
         H5Sclose(sid);
         H5Fclose(fid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_huge_chunks() */
 
 
@@ -7938,7 +7941,7 @@ test_chunk_cache(hid_t fapl)
     if (H5Fclose(fid) < 0) FAIL_STACK_ERROR
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -7951,7 +7954,7 @@ error:
         H5Sclose(sid);
         H5Fclose(fid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_chunk_cache() */
 
 
@@ -8225,7 +8228,7 @@ test_big_chunks_bypass_cache(hid_t fapl)
     HDfree(rdata2);
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -8244,7 +8247,7 @@ error:
         HDfree(rdata1);
     if(rdata2)
         HDfree(rdata2);
-    return -1;
+    return FAIL;
 } /* end test_big_chunks_bypass_cache() */
 
 
@@ -8580,7 +8583,7 @@ test_chunk_fast(const char *env_h5_driver, hid_t fapl)
     if(H5Pclose(my_fapl) < 0) FAIL_STACK_ERROR
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -8591,7 +8594,7 @@ error:
         H5Fclose(fid);
         H5Pclose(my_fapl);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_chunk_fast() */
 
 
@@ -8704,7 +8707,7 @@ test_reopen_chunk_fast(hid_t fapl)
     } /* end for */
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -8714,7 +8717,7 @@ error:
         H5Sclose(scalar_sid);
         H5Fclose(fid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_reopen_chunk_fast() */
 
 
@@ -8813,7 +8816,7 @@ test_chunk_fast_bug1(hid_t fapl)
     if(H5Sclose(sid) < 0) FAIL_STACK_ERROR
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -8822,7 +8825,7 @@ error:
         H5Sclose(sid);
         H5Fclose(fid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_chunk_fast_bug1() */
 
 /* This message derives from H5Z */
@@ -9268,7 +9271,7 @@ test_chunk_expand(hid_t fapl)
         PASSED();
     } /* end else */
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -9281,7 +9284,7 @@ error:
         H5Sclose(scalar_sid);
         H5Fclose(fid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_chunk_expand() */
 
 
@@ -9686,7 +9689,7 @@ test_fixed_array(hid_t fapl)
     HDfree(rbuf_big);
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -9700,7 +9703,7 @@ error:
         HDfree(wbuf_big);
     if(rbuf_big)
         HDfree(rbuf_big);
-    return -1;
+    return FAIL;
 } /* end test_fixed_array() */
 
 
@@ -9944,7 +9947,7 @@ test_single_chunk(hid_t fapl)
     HDfree(t_rbuf);
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -9964,7 +9967,7 @@ error:
         HDfree(t_wbuf);
     if(t_rbuf)
         HDfree(t_rbuf);
-    return -1;
+    return FAIL;
 } /* end test_single_chunk() */
 
 
@@ -10030,15 +10033,15 @@ test_idx_compatible(void)
     }
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
         H5Dclose(did);
     H5Fclose(fid);
     } H5E_END_TRY;
-    return -1;
-} /* test_idx_compatible */
+    return FAIL;
+} /* end test_idx_compatible() */
 
 /*-------------------------------------------------------------------------
  *
@@ -10168,7 +10171,7 @@ test_unfiltered_edge_chunks(hid_t fapl)
         TEST_ERROR
 
     PASSED();
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -10177,8 +10180,8 @@ error:
         H5Sclose(sid);
         H5Fclose(fid);
     } H5E_END_TRY;
-    return -1;
-} /* test_unfiltered_edge_chunks */
+    return FAIL;
+} /* end test_unfiltered_edge_chunks() */
 
 
 /*-------------------------------------------------------------------------
@@ -10282,7 +10285,7 @@ test_large_chunk_shrink(hid_t fapl)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -10292,7 +10295,7 @@ error:
         H5Sclose(scalar_sid);
         H5Fclose(fid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_large_chunk_shrink() */
 
 
@@ -10376,7 +10379,7 @@ test_zero_dim_dset(hid_t fapl)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -10385,7 +10388,7 @@ error:
         H5Sclose(sid);
         H5Fclose(fid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_zero_dim_dset() */
 
 
@@ -10426,7 +10429,7 @@ test_swmr_non_latest(const char *env_h5_driver, hid_t fapl)
     if(!H5FD__supports_swmr_test(env_h5_driver)) {
         SKIPPED();
         HDputs("    Test skipped due to VFD not supporting SWMR I/O.");
-        return 0;
+        return SUCCEED;
     }
 
     /* Check if we are using the latest version of the format */
@@ -10625,7 +10628,7 @@ test_swmr_non_latest(const char *env_h5_driver, hid_t fapl)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -10635,7 +10638,7 @@ error:
         H5Gclose(gid);
         H5Fclose(fid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* test_swmr_non_latest() */
 
 
@@ -10676,7 +10679,7 @@ test_earray_hdr_fd(const char *env_h5_driver, hid_t fapl)
     if(!H5FD__supports_swmr_test(env_h5_driver)) {
         SKIPPED();
         HDputs("    Test skipped due to VFD not supporting SWMR I/O.");
-        return 0;
+        return SUCCEED;
     }
 
     if((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
@@ -10743,7 +10746,7 @@ test_earray_hdr_fd(const char *env_h5_driver, hid_t fapl)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -10755,7 +10758,7 @@ error:
         H5Sclose(sid);
         H5Sclose(msid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* test_earray_hdr_fd() */
 
 
@@ -10796,7 +10799,7 @@ test_farray_hdr_fd(const char *env_h5_driver, hid_t fapl)
     if(!H5FD__supports_swmr_test(env_h5_driver)) {
         SKIPPED();
         HDputs("    Test skipped due to VFD not supporting SWMR I/O.");
-        return 0;
+        return SUCCEED;
     }
 
     if((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
@@ -10863,7 +10866,7 @@ test_farray_hdr_fd(const char *env_h5_driver, hid_t fapl)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -10875,8 +10878,8 @@ error:
         H5Sclose(sid);
         H5Sclose(msid);
     } H5E_END_TRY;
-    return -1;
-} /* test_farray_hdr_fd() */
+    return FAIL;
+} /* end test_farray_hdr_fd() */
 
 
 /*-------------------------------------------------------------------------
@@ -10916,7 +10919,7 @@ test_bt2_hdr_fd(const char *env_h5_driver, hid_t fapl)
     if(!H5FD__supports_swmr_test(env_h5_driver)) {
         SKIPPED();
         HDputs("    Test skipped due to VFD not supporting SWMR I/O.");
-        return 0;
+        return SUCCEED;
     }
 
     if((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
@@ -10983,7 +10986,7 @@ test_bt2_hdr_fd(const char *env_h5_driver, hid_t fapl)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -10995,8 +10998,8 @@ error:
         H5Sclose(sid);
         H5Sclose(msid);
     } H5E_END_TRY;
-    return -1;
-} /* test_bt2_hdr_fd() */
+    return FAIL;
+} /* end test_bt2_hdr_fd() */
 
 
 /*-------------------------------------------------------------------------
@@ -11379,7 +11382,7 @@ test_storage_size(hid_t fapl)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -11389,7 +11392,7 @@ error:
         H5Sclose(sid);
         H5Fclose(fid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_storage_size() */
 
 
@@ -11470,7 +11473,7 @@ test_power2up(hid_t fapl)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -11480,7 +11483,7 @@ error:
         H5Pclose(dcpl);
         H5Fclose(fid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_power2up() */
 
 
@@ -11792,13 +11795,13 @@ test_scatter(void)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
         H5Sclose(sid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_scatter() */
 
 
@@ -11860,7 +11863,7 @@ gather_cb(const void *dst_buf, size_t dst_buf_bytes_used,
 
 error:
     return FAIL;
-}
+} /* end gather_cb() */
 
 static herr_t
 test_gather(void)
@@ -12154,13 +12157,13 @@ test_gather(void)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
         H5Sclose(sid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_gather() */
 
 
@@ -12194,7 +12197,7 @@ scatter_error_cb_fail(void **src_buf/*out*/, size_t *src_buf_bytes_used/*out*/,
     *src_buf_bytes_used = nelmts * sizeof(scatter_info->src_buf[0]);
 
     return FAIL;
-}
+} /* end scatter_error_cb_fail() */
 
 static herr_t
 scatter_error_cb_null(void **src_buf/*out*/, size_t *src_buf_bytes_used/*out*/,
@@ -12212,7 +12215,7 @@ scatter_error_cb_null(void **src_buf/*out*/, size_t *src_buf_bytes_used/*out*/,
     *src_buf_bytes_used = nelmts * sizeof(scatter_info->src_buf[0]);
 
     return SUCCEED;
-}
+} /* end scatter_error_cb_null() */
 
 static herr_t
 scatter_error_cb_unalign(void **src_buf/*out*/, size_t *src_buf_bytes_used/*out*/,
@@ -12223,7 +12226,7 @@ scatter_error_cb_unalign(void **src_buf/*out*/, size_t *src_buf_bytes_used/*out*
     *src_buf_bytes_used = *(size_t *)_src_buf_bytes_used;
 
     return SUCCEED;
-}
+} /* endscatter_error_cb_unalign() */
 
 static herr_t
 test_scatter_error(void)
@@ -12357,13 +12360,13 @@ test_scatter_error(void)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
         H5Sclose(sid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_scatter_error() */
 
 
@@ -12386,7 +12389,7 @@ gather_error_cb_fail(const void H5_ATTR_UNUSED *dst_buf,
     size_t H5_ATTR_UNUSED dst_buf_bytes_used, void H5_ATTR_UNUSED *op_data)
 {
     return FAIL;
-}
+} /* end gather_error_cb_fail() */
 
 static herr_t
 test_gather_error(void)
@@ -12496,13 +12499,13 @@ test_gather_error(void)
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
         H5Sclose(sid);
     } H5E_END_TRY;
-    return -1;
+    return FAIL;
 } /* end test_gather_error() */
 
 /*-------------------------------------------------------------------------
@@ -12599,8 +12602,8 @@ static herr_t dls_01_read_stuff( hid_t fid );
 static herr_t dls_01_main( void );
 
 static herr_t
-dls_01_setup_file( hid_t fid ) {
-
+dls_01_setup_file( hid_t fid )
+{
     int status = 0;
     hid_t sid = 0, did = 0, tid = 0, dcpl = 0;
     int ndims = 1;
@@ -12638,17 +12641,15 @@ dls_01_setup_file( hid_t fid ) {
     status = H5Sclose( sid );
     if ( status != 0 ) TEST_ERROR
 
-    return 0;
+    return SUCCEED;
 
 error:
-
-    return -1;
-
-} /* dls_01_setup_file */
+    return FAIL;
+} /* end dls_01_setup_file() */
 
 static herr_t
-dls_01_write_data( hid_t fid, char* buffer ) {
-
+dls_01_write_data( hid_t fid, char* buffer )
+{
     int status = 0;
     hid_t did = 0, tid = 0;
     hsize_t extent[1] = {4};
@@ -12674,17 +12675,15 @@ dls_01_write_data( hid_t fid, char* buffer ) {
     status = H5Dclose( did );
     if ( status != 0 ) TEST_ERROR
 
-    return 0;
+    return SUCCEED;
 
 error:
-
-    return -1;
-
-} /* dls_01_write_data */
+    return FAIL;
+} /* end dls_01_write_data() */
 
 static herr_t
-dls_01_read_stuff( hid_t fid ) {
-
+dls_01_read_stuff( hid_t fid )
+{
     int status = 0;
     hid_t did = 0;
     H5O_info_t info;
@@ -12698,17 +12697,15 @@ dls_01_read_stuff( hid_t fid ) {
     status = H5Dclose( did );
     if ( status != 0 ) TEST_ERROR
 
-    return 0;
+    return SUCCEED;
 
 error:
-
-    return -1;
-
-} /* dls_01_read_stuff() */
+    return FAIL;
+} /* end dls_01_read_stuff() */
 
 static herr_t
-dls_01_main( void ) {
-
+dls_01_main( void )
+{
     char filename[512];
     int status = 0;
     hid_t fapl = 0, fid = 0;
@@ -12765,15 +12762,12 @@ dls_01_main( void ) {
 
     PASSED();
 
-    return 0;
+    return SUCCEED;
 
 error:
-
     if ( buffer ) HDfree(buffer);
-
-    return -1;
-
-} /* dls_01_main() */
+    return FAIL;
+} /* end dls_01_main() */
 
 /*-------------------------------------------------------------------------
  * Function:    test_compact_open_close_dirty
@@ -12881,7 +12875,7 @@ test_compact_open_close_dirty(hid_t fapl)
         TEST_ERROR
 
      PASSED();
-     return 0;
+     return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
@@ -12890,8 +12884,8 @@ error:
         H5Dclose(did);
         H5Fclose(fid);
     } H5E_END_TRY;
-    return -1;
-} /* test_compact_open_close_dirty() */
+    return FAIL;
+} /* end test_compact_open_close_dirty() */
 
 
 /*-------------------------------------------------------------------------
@@ -13030,7 +13024,7 @@ test_versionbounds(void)
         TEST_ERROR
     dcpl = -1;
     PASSED();
-    return 0;
+    return SUCCEED;
 
  error:
     H5E_BEGIN_TRY {
@@ -13043,8 +13037,119 @@ test_versionbounds(void)
         H5Fclose(srcfile);
         H5Fclose(vfile);
     } H5E_END_TRY;
-    return -1;
-} /* test_versionbounds() */
+    return FAIL;
+} /* end test_versionbounds() */
+
+
+/*-----------------------------------------------------------------------------
+ * Function:   test_object_header_minimization_dcpl
+ *
+ * Purpose:    Test the "datset object header minimization" property as part of
+ *             the DCPL.
+ *
+ * Return:     Success/pass:   0
+ *             Failure/error: -1
+ *
+ * Programmer: Jacob Smith
+ *             2018 August 15
+ *
+ * Changes:    None.
+ *-----------------------------------------------------------------------------
+ */
+static herr_t
+test_object_header_minimization_dcpl(void)
+{
+    hid_t    dcpl_id  = -1;
+    hid_t    file_id  = -1;
+    char     filename[FILENAME_BUF_SIZE] = "";
+    hbool_t  minimize = FALSE;
+    herr_t   ret;
+
+    TESTING("dcpl flags to minimize dataset object header");
+
+    /*********/
+    /* SETUP */
+    /*********/
+
+    if(NULL == h5_fixname(OHMIN_FILENAME_A, H5P_DEFAULT, filename, sizeof(filename)))
+        TEST_ERROR
+
+    file_id = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+    if (0 > file_id) TEST_ERROR
+
+    dcpl_id = H5Pcreate(H5P_DATASET_CREATE);
+    if (0 > dcpl_id) TEST_ERROR
+
+    /*********/
+    /* TESTS */
+    /*********/
+
+    /* default value (not set explicitly)
+     */
+    if (H5Pget_dset_no_attrs_hint(dcpl_id, &minimize) == FAIL) TEST_ERROR
+    if (FALSE != minimize)
+        TEST_ERROR
+
+    /* FALSE-set value
+     */
+    if (H5Pset_dset_no_attrs_hint(dcpl_id, FALSE) == FAIL) TEST_ERROR
+    if (H5Pget_dset_no_attrs_hint(dcpl_id, &minimize) == FAIL) TEST_ERROR
+    if (FALSE != minimize)
+        TEST_ERROR
+
+    /* TRUE-set value
+     */
+    if (H5Pset_dset_no_attrs_hint(dcpl_id, TRUE) == FAIL) TEST_ERROR
+    if (H5Pget_dset_no_attrs_hint(dcpl_id, &minimize) == FAIL) TEST_ERROR
+    if (TRUE != minimize)
+        TEST_ERROR
+
+    /* error cases
+     */
+    H5E_BEGIN_TRY {
+        ret = H5Pget_dset_no_attrs_hint(-1, &minimize);
+    } H5E_END_TRY;
+    if (ret == SUCCEED)
+        TEST_ERROR /* Invalid DCPL ID should fail */
+
+    H5E_BEGIN_TRY {
+        ret = H5Pset_dset_no_attrs_hint(-1, FALSE);
+    } H5E_END_TRY;
+    if (ret == SUCCEED)
+        TEST_ERROR /* Invalid DCPL ID should fail */
+
+    H5E_BEGIN_TRY {
+        ret = H5Pset_dset_no_attrs_hint(-1, TRUE);
+    } H5E_END_TRY;
+    if (ret == SUCCEED)
+        TEST_ERROR /* Invalid DCPL ID should fail */
+
+    H5E_BEGIN_TRY {
+        ret = H5Pget_dset_no_attrs_hint(dcpl_id, NULL);
+    } H5E_END_TRY;
+    if (ret == SUCCEED)
+        TEST_ERROR /* NULL out pointer should fail */
+
+    /************/
+    /* TEARDOWN */
+    /************/
+
+    if (H5Fclose(file_id) == FAIL)
+        TEST_ERROR
+
+    if (H5Pclose(dcpl_id) == FAIL)
+        TEST_ERROR
+
+    PASSED();
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY {
+        H5Pclose(dcpl_id);
+        H5Fclose(file_id);
+    } H5E_END_TRY;
+    return FAIL;
+} /* end test_object_header_minimization_dcpl() */
 
 
 /*-------------------------------------------------------------------------
@@ -13068,6 +13173,7 @@ main(void)
     hid_t    fcpl = -1, fcpl2 = -1;
     unsigned new_format;
     unsigned paged;
+    unsigned minimized_ohdr;
     int      mdc_nelmts;
     size_t   rdcc_nelmts;
     size_t   rdcc_nbytes;
@@ -13118,10 +13224,12 @@ main(void)
     /* Test with paged aggregation enabled or not */
     for(paged = FALSE; paged <= TRUE; paged++) {
 
-        /* Temporary: skip testing for multi/split drivers:
-             fail file create when persisting free-space or using paged aggregation strategy */
-        if(!contig_addr_vfd && paged)
-            continue;
+      /* Temporary: skip testing for multi/split drivers:
+           fail file create when persisting free-space or using paged aggregation strategy */
+      if(!contig_addr_vfd && paged)
+          continue;
+
+      for (minimized_ohdr = FALSE; minimized_ohdr <= TRUE; minimized_ohdr++) {
 
         /* Test with old & new format groups */
         for(new_format = FALSE; new_format <= TRUE; new_format++) {
@@ -13153,6 +13261,12 @@ main(void)
             if((file = H5Fcreate(filename, H5F_ACC_TRUNC, my_fcpl, my_fapl)) < 0)
                 goto error;
 
+            if (TRUE == minimized_ohdr) {
+                if (0 > H5Fset_dset_no_attrs_hint(file, TRUE))
+                    goto error;
+                puts("(minimized dataset object headers with file setting)");
+            }
+
             /* Cause the library to emit initial messages */
             if((grp = H5Gcreate2(file, "emit diagnostics", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
                 goto error;
@@ -13230,6 +13344,7 @@ main(void)
             if(H5Fclose(file) < 0)
                 goto error;
         } /* end for new_format */
+      } /* for minimized dset object headers */
     } /* end for paged */
 
     /* Close property lists */
@@ -13246,6 +13361,8 @@ main(void)
     /* Tests version bounds using its own file */
     nerrors += (test_versionbounds() < 0             ? 1 : 0);
 
+    nerrors += (test_object_header_minimization_dcpl() < 0 ? 1 : 0);
+
     /* Run misc tests */
     nerrors += dls_01_main();
 
@@ -13261,12 +13378,12 @@ main(void)
 #endif /* H5_HAVE_FILTER_SZIP */
     h5_cleanup(FILENAME, fapl);
 
-    return 0;
+    return EXIT_SUCCESS;
 
 error:
     nerrors = MAX(1, nerrors);
     printf("***** %d DATASET TEST%s FAILED! *****\n",
             nerrors, 1 == nerrors ? "" : "S");
-    return 1;
-}
+    return EXIT_FAILURE;
+} /* end main() */
 
diff --git a/test/dt_arith.c b/test/dt_arith.c
index c7f2986..2729ba1 100644
--- a/test/dt_arith.c
+++ b/test/dt_arith.c
@@ -4883,7 +4883,24 @@ run_fp_tests(const char *name)
 #if H5_SIZEOF_LONG_DOUBLE!=H5_SIZEOF_DOUBLE && H5_SIZEOF_LONG_DOUBLE!=0
     nerrors += test_conv_flt_1(name, TEST_DENORM, H5T_NATIVE_FLOAT, H5T_NATIVE_LDOUBLE);
     nerrors += test_conv_flt_1(name, TEST_DENORM, H5T_NATIVE_DOUBLE, H5T_NATIVE_LDOUBLE);
+#ifndef H5_DISABLE_SOME_LDOUBLE_CONV
     nerrors += test_conv_flt_1(name, TEST_DENORM, H5T_NATIVE_LDOUBLE, H5T_NATIVE_FLOAT);
+#else
+    {
+        char		str[256];		/*string		*/
+
+        HDsnprintf(str, sizeof(str), "Testing %s denormalized %s -> %s conversions",
+                name, "long double", "float");
+        printf("%-70s", str);
+        SKIPPED();
+#if H5_SIZEOF_LONG_DOUBLE!=0
+        HDputs("    Test skipped due to the conversion problem on IBM ppc64le cpu.");
+#else
+        HDputs("    Test skipped due to disabled long double.");
+#endif
+    }
+#endif
+
     nerrors += test_conv_flt_1(name, TEST_DENORM, H5T_NATIVE_LDOUBLE, H5T_NATIVE_DOUBLE);
 #endif
 
@@ -4893,8 +4910,24 @@ run_fp_tests(const char *name)
 #if H5_SIZEOF_LONG_DOUBLE!=H5_SIZEOF_DOUBLE && H5_SIZEOF_LONG_DOUBLE!=0
     nerrors += test_conv_flt_1(name, TEST_SPECIAL, H5T_NATIVE_FLOAT, H5T_NATIVE_LDOUBLE);
     nerrors += test_conv_flt_1(name, TEST_SPECIAL, H5T_NATIVE_DOUBLE, H5T_NATIVE_LDOUBLE);
+#ifndef H5_DISABLE_SOME_LDOUBLE_CONV
     nerrors += test_conv_flt_1(name, TEST_SPECIAL, H5T_NATIVE_LDOUBLE, H5T_NATIVE_FLOAT);
     nerrors += test_conv_flt_1(name, TEST_SPECIAL, H5T_NATIVE_LDOUBLE, H5T_NATIVE_DOUBLE);
+#else
+    {
+        char		str[256];		/*string		*/
+
+        HDsnprintf(str, sizeof(str), "Testing %s special %s -> %s conversions",
+                name, "long double", "float or double");
+        printf("%-70s", str);
+        SKIPPED();
+#if H5_SIZEOF_LONG_DOUBLE!=0
+        HDputs("    Test skipped due to the conversion problem on IBM ppc64le cpu.");
+#else
+        HDputs("    Test skipped due to disabled long double.");
+#endif
+    }
+#endif
 #endif
 
 done:
@@ -4963,7 +4996,7 @@ run_int_fp_conv(const char *name)
     nerrors += test_conv_int_fp(name, TEST_NORMAL, H5T_NATIVE_INT, H5T_NATIVE_LDOUBLE);
     nerrors += test_conv_int_fp(name, TEST_NORMAL, H5T_NATIVE_UINT, H5T_NATIVE_LDOUBLE);
 #if H5_SIZEOF_LONG!=H5_SIZEOF_INT
-#ifndef H5_LONG_TO_LDOUBLE_SPECIAL
+#if !defined(H5_LONG_TO_LDOUBLE_SPECIAL) && !defined(H5_DISABLE_SOME_LDOUBLE_CONV)
     nerrors += test_conv_int_fp(name, TEST_NORMAL, H5T_NATIVE_LONG, H5T_NATIVE_LDOUBLE);
     nerrors += test_conv_int_fp(name, TEST_NORMAL, H5T_NATIVE_ULONG, H5T_NATIVE_LDOUBLE);
 #else
@@ -5077,16 +5110,46 @@ run_fp_int_conv(const char *name)
 #endif
 
 #if H5_SIZEOF_LONG_DOUBLE!=H5_SIZEOF_DOUBLE
-        nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_SCHAR);
-        nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_UCHAR);
-        nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_SHORT);
-        nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_USHORT);
-        nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_INT);
-        nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_UINT);
+        if(test_values != TEST_SPECIAL) {
+	    nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_SCHAR);
+            nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_UCHAR);
+            nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_SHORT);
+            nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_USHORT);
+            nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_INT);
+            nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_UINT);
+        } else {
+#ifndef H5_DISABLE_SOME_LDOUBLE_CONV
+	    nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_SCHAR);
+            nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_UCHAR);
+            nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_SHORT);
+            nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_USHORT);
+            nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_INT);
+            nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_UINT);
+#else
+            char		str[256];		/*string		*/
+
+            HDsnprintf(str, sizeof(str), "Testing %s special %s -> %s conversions",
+                name, "long double", "signed and unsigned char, short, int, long");
+            printf("%-70s", str);
+            SKIPPED();
+#if H5_SIZEOF_LONG_DOUBLE!=0
+            HDputs("    Test skipped due to the conversion problem on IBM ppc64le cpu.");
+#else
+            HDputs("    Test skipped due to disabled long double.");
+#endif
+#endif
+        }
 #if H5_SIZEOF_LONG!=H5_SIZEOF_INT && H5_SIZEOF_LONG_DOUBLE!=0
 #ifndef H5_LDOUBLE_TO_LONG_SPECIAL
-        nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_LONG);
-        nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_ULONG);
+        if(test_values != TEST_SPECIAL && test_values != TEST_NORMAL) {
+            nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_LONG);
+            nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_ULONG);
+        } else {
+#ifndef H5_DISABLE_SOME_LDOUBLE_CONV
+            nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_LONG);
+            nerrors += test_conv_int_fp(name, test_values, H5T_NATIVE_LDOUBLE, H5T_NATIVE_ULONG);
+#endif
+        }
 #else
         {
             char		str[256];		/*string		*/
diff --git a/test/efc.c b/test/efc.c
index d63ef34..b427884 100644
--- a/test/efc.c
+++ b/test/efc.c
@@ -20,6 +20,7 @@
 #include "H5Fpkg.h"
 #include "H5CXprivate.h"        /* API Contexts                         */
 #include "H5Iprivate.h"
+#include "H5Pprivate.h"         /* Property lists                       */
 
 const char *FILENAME[] = {
     "efc0",
@@ -2896,6 +2897,8 @@ int
 main(void)
 {
     unsigned nerrors = 0;        /* track errors */
+    H5P_genplist_t *plist;      /* Property list pointer for FAPL */
+    H5VL_connector_prop_t connector_prop; /* Property for VOL connector ID & info        */
     hbool_t     api_ctx_pushed = FALSE;             /* Whether API context pushed */
 
     /* Test Setup */
@@ -2917,6 +2920,15 @@ main(void)
     if(H5CX_push() < 0) FAIL_STACK_ERROR
     api_ctx_pushed = TRUE;
 
+    /* Get the VOL info from the fapl */
+    plist = (H5P_genplist_t *)H5I_object(fapl_id);
+    H5P_peek(plist, H5F_ACS_VOL_CONN_NAME, &connector_prop);
+
+    /* Stash a copy of the "top-level" connector property, before any pass-through
+     *  connectors modify or unwrap it.
+     */
+    H5CX_set_vol_connector_prop(&connector_prop);
+
     /* Test Functions */
     nerrors += test_single();
     nerrors += test_graph_nocycle();
diff --git a/test/enc_dec_plist.c b/test/enc_dec_plist.c
index 36db2d0..33d23dc 100644
--- a/test/enc_dec_plist.c
+++ b/test/enc_dec_plist.c
@@ -146,6 +146,9 @@ main(void)
     if((H5Pset_fill_value(dcpl, H5T_NATIVE_DOUBLE, &fill)) < 0)
         FAIL_STACK_ERROR
 
+    if((H5Pset_dset_no_attrs_hint(dcpl, FALSE)) < 0)
+        FAIL_STACK_ERROR
+
     max_size[0] = 100;
     if((H5Pset_external(dcpl, "ext1.data", (off_t)0, 
                          (hsize_t)(max_size[0] * sizeof(int)/4))) < 0)
@@ -460,8 +463,6 @@ main(void)
         FAIL_STACK_ERROR
     if((H5Pset_mdc_image_config(fapl, &my_cache_image_config)) < 0)
         FAIL_STACK_ERROR
-    if((H5Pset_core_write_tracking(fapl, TRUE, 1024 * 1024)) < 0)
-        FAIL_STACK_ERROR
 
     /* Test encoding & decoding property list */
     if(test_encode_decode(fapl) < 0)
diff --git a/test/gen_bogus.c b/test/gen_bogus.c
index ec29eb9..237b024 100644
--- a/test/gen_bogus.c
+++ b/test/gen_bogus.c
@@ -89,6 +89,14 @@ generate_datasets(hid_t loc_id, unsigned bogus_id)
     if((did = H5Dcreate2(loc_id, "Dataset4", H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0) goto error;
     if(H5Dclose(did) < 0) goto error;
 
+    /* Set "shareable" message flag for bogus message */
+    bogus_flags = H5O_MSG_FLAG_SHAREABLE;
+    if(H5Pset(dcpl, H5O_BOGUS_MSG_FLAGS_NAME, &bogus_flags) < 0) goto error;
+
+    /* Create fourth dataset, with "shareable" message flag */
+    if((did = H5Dcreate2(loc_id, "Dataset5", H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0) goto error;
+    if(H5Dclose(did) < 0) goto error;
+
     /* Close dataset creation property list */
     if(H5Pclose(dcpl) < 0) goto error;
 
diff --git a/test/gen_plist.c b/test/gen_plist.c
index 62693bd..68da6cc 100644
--- a/test/gen_plist.c
+++ b/test/gen_plist.c
@@ -125,6 +125,9 @@ main(void)
     if((ret = H5Pset_fill_value(dcpl1, H5T_STD_I32BE, &fill)) < 0)
         assert(ret > 0);
 
+    if((ret = H5Pset_dset_no_attrs_hint(dcpl1, FALSE)) < 0)
+        assert(ret > 0);
+
     max_size[0] = 100;
     if((ret = H5Pset_external(dcpl1, "ext1.data", (off_t)0, 
                          (hsize_t)(max_size[0] * sizeof(int)/4))) < 0)
@@ -363,9 +366,6 @@ main(void)
     if((ret = H5Pset_mdc_image_config(fapl1, &my_cache_image_config)) < 0)
         assert(ret > 0);
 
-    if((ret = H5Pset_core_write_tracking(fapl1, TRUE, (size_t)(1024 * 1024))) < 0)
-        assert(ret > 0);
-
     if((ret = encode_plist(fapl1, little_endian, word_length, "testfiles/plist_files/fapl_")) < 0)
         assert(ret > 0);
 
@@ -476,7 +476,7 @@ encode_plist(hid_t plist_id, int little_endian, int word_length, const char *fil
         HDassert(ret > 0);
 
     fd = HDopen(filename, O_RDWR | O_CREAT | O_TRUNC, H5_POSIX_CREATE_MODE_RW);
-    HDassert(fd > 0);
+    HDassert(fd >= 0);
 
     write_size = HDwrite(fd, temp_buf, temp_size);
     HDassert(write_size == (ssize_t)temp_size);
diff --git a/test/h5test.c b/test/h5test.c
index 0805f06..dfa6a31 100644
--- a/test/h5test.c
+++ b/test/h5test.c
@@ -158,47 +158,8 @@ h5_clean_files(const char *base_name[], hid_t fapl)
     int i;
 
     for(i = 0; base_name[i]; i++) {
-        char filename[1024];
-        char temp[2048];
-        hid_t driver;
-
-        if(NULL == h5_fixname(base_name[i], fapl, filename, sizeof(filename)))
-            continue;
-
-        driver = H5Pget_driver(fapl);
-
-        if(driver == H5FD_FAMILY) {
-            int j;
-
-            for(j = 0; /*void*/; j++) {
-                HDsnprintf(temp, sizeof temp, filename, j);
-
-                if(HDaccess(temp, F_OK) < 0)
-                    break;
-
-                HDremove(temp);
-            } /* end for */
-        } else if(driver == H5FD_CORE) {
-            hbool_t backing;        /* Whether the core file has backing store */
-
-            H5Pget_fapl_core(fapl, NULL, &backing);
-
-            /* If the file was stored to disk with bacing store, remove it */
-            if(backing)
-                HDremove(filename);
-        } else if (driver == H5FD_MULTI) {
-            H5FD_mem_t mt;
-
-            HDassert(HDstrlen(multi_letters)==H5FD_MEM_NTYPES);
-
-            for(mt = H5FD_MEM_DEFAULT; mt < H5FD_MEM_NTYPES; H5_INC_ENUM(H5FD_mem_t,mt)) {
-                HDsnprintf(temp, sizeof temp, "%s-%c.h5", filename, multi_letters[mt]);
-                HDremove(temp); /*don't care if it fails*/
-            } /* end for */
-        } else {
-            HDremove(filename);
-        }
-    } /* end for */
+        h5_delete_test_file(base_name[i], fapl);
+    }
 
     /* Close the FAPL used to access the file */
     H5Pclose(fapl);
@@ -266,10 +227,10 @@ h5_delete_test_file(const char *base_name, hid_t fapl)
         for(mt = H5FD_MEM_DEFAULT; mt < H5FD_MEM_NTYPES; H5_INC_ENUM(H5FD_mem_t,mt)) {
             HDsnprintf(sub_filename, sizeof(sub_filename), "%s-%c.h5", filename, multi_letters[mt]);
             HDremove(sub_filename);
-        } /* end for */
+        }
     } else {
         HDremove(filename);
-    } /* end if */
+    } /* end driver selection tree */
 
     return;
 } /* end h5_delete_test_file() */
@@ -652,7 +613,7 @@ h5_fixname_real(const char *base_name, hid_t fapl, const char *_suffix,
                 printf("*** Hint ***\n"
                        "You can use environment variable HDF5_PARAPREFIX to "
                        "run parallel test files in a\n"
-                       "different directory or to add file type prefix. E.g.,\n"
+                       "different directory or to add file type prefix. e.g.,\n"
                        "   HDF5_PARAPREFIX=pfs:/PFS/user/me\n"
                        "   export HDF5_PARAPREFIX\n"
                        "*** End of Hint ***\n");
@@ -802,10 +763,10 @@ h5_rmprefix(const char *filename)
  *
  * Purpose:     Returns a file access template which is the default template
  *              but with a file driver, VOL connector, or libver bound set
- *		according to a constant or environment variable
+ *              according to a constant or environment variable
  *
- * Return:      Success:  A file access property list
- *              Failure:  -1
+ * Return:      Success:    A file access property list
+ *              Failure:    H5I_INVALID_HID
  *
  * Programmer:  Robb Matzke
  *              Thursday, November 19, 1998
@@ -815,28 +776,77 @@ h5_rmprefix(const char *filename)
 hid_t
 h5_fileaccess(void)
 {
-    hid_t       fapl = -1;
+    hid_t       fapl_id = H5I_INVALID_HID;
 
-    if((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
-        return -1;
+    if((fapl_id = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        goto error;
 
     /* Attempt to set up a file driver first */
-    if(h5_get_vfd_fapl(fapl) < 0)
-         return -1;
+    if(h5_get_vfd_fapl(fapl_id) < 0)
+        goto error;
 
     /* Next, try to set up a VOL connector */
-    if(h5_get_vol_fapl(fapl) < 0)
-        return -1;
+    if(h5_get_vol_fapl(fapl_id) < 0)
+        goto error;
  
     /* Finally, check for libver bounds */
-    if(h5_get_libver_fapl(fapl) < 0)
-        return -1;
+    if(h5_get_libver_fapl(fapl_id) < 0)
+        goto error;
  
-    return(fapl);
+    return fapl_id;
+
+error:
+    if(fapl_id != H5I_INVALID_HID)
+        H5Pclose(fapl_id);
+    return H5I_INVALID_HID;
 } /* end h5_fileaccess() */
 
 
 /*-------------------------------------------------------------------------
+ * Function:    h5_fileaccess_flags
+ *
+ * Purpose:     Returns a file access template which is the default template
+ *              but with a file driver, VOL connector, or libver bound set
+ *              according to a constant or environment variable
+ *
+ * Return:      Success:    A file access property list
+ *              Failure:    H5I_INVALID_HID
+ *
+ * Programmer:  Robb Matzke
+ *              Thursday, November 19, 1998
+ *
+ *-------------------------------------------------------------------------
+ */
+hid_t
+h5_fileaccess_flags(unsigned flags)
+{
+    hid_t       fapl_id = H5I_INVALID_HID;
+
+    if((fapl_id = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        goto error;
+
+    /* Attempt to set up a file driver first */
+    if((flags & H5_FILEACCESS_VFD) && h5_get_vfd_fapl(fapl_id) < 0)
+        goto error;
+
+    /* Next, try to set up a VOL connector */
+    if((flags & H5_FILEACCESS_VOL) && h5_get_vol_fapl(fapl_id) < 0)
+        goto error;
+ 
+    /* Finally, check for libver bounds */
+    if((flags & H5_FILEACCESS_LIBVER) && h5_get_libver_fapl(fapl_id) < 0)
+        goto error;
+ 
+    return fapl_id;
+
+error:
+    if(fapl_id != H5I_INVALID_HID)
+        H5Pclose(fapl_id);
+    return H5I_INVALID_HID;
+} /* end h5_fileaccess_flags() */
+
+
+/*-------------------------------------------------------------------------
  * Function:    h5_get_vfd_fapl
  *
  * Purpose:     Sets the file driver for a FAPL according to the value specified
@@ -855,6 +865,7 @@ h5_get_vfd_fapl(hid_t fapl)
 {
     const char  *env = NULL;    /* HDF5_DRIVER environment variable     */
     const char  *tok = NULL;    /* strtok pointer                       */
+    char        *lasts = NULL;  /* Context pointer for strtok_r() call */
     char        buf[1024];      /* buffer for tokenizing HDF5_DRIVER    */
 
     /* Get the environment variable, if it exists */
@@ -877,7 +888,7 @@ h5_get_vfd_fapl(hid_t fapl)
      */
     HDstrncpy(buf, env, sizeof(buf));
     buf[sizeof(buf) - 1] = '\0';
-    if(NULL == (tok = HDstrtok(buf, " \t\n\r")))
+    if(NULL == (tok = HDstrtok_r(buf, " \t\n\r", &lasts)))
         goto done;
 
     if(!HDstrcmp(tok, "sec2")) {
@@ -890,11 +901,11 @@ h5_get_vfd_fapl(hid_t fapl)
             goto error;
     } else if(!HDstrcmp(tok, "core")) {
         /* In-memory driver settings (backing store on, 1 MB increment) */
-        if(H5Pset_fapl_core(fapl, (size_t)1, TRUE) < 0)
+        if(H5Pset_fapl_core(fapl, (size_t)H5_MB, TRUE) < 0)
             goto error;
     } else if(!HDstrcmp(tok, "core_paged")) {
         /* In-memory driver with write tracking and paging on */
-        if(H5Pset_fapl_core(fapl, (size_t)1, TRUE) < 0)
+        if(H5Pset_fapl_core(fapl, (size_t)H5_MB, TRUE) < 0)
             goto error;
         if(H5Pset_core_write_tracking(fapl, TRUE, (size_t)4096) < 0)
             goto error;
@@ -936,7 +947,7 @@ h5_get_vfd_fapl(hid_t fapl)
         hsize_t fam_size = 100 * 1024 * 1024;   /* 100 MB */
 
         /* Was a family size specified in the environment variable? */
-        if((tok = HDstrtok(NULL, " \t\n\r")))
+        if((tok = HDstrtok_r(NULL, " \t\n\r", &lasts)))
             fam_size = (hsize_t)(HDstrtod(tok, NULL) * 1024 * 1024);
         if(H5Pset_fapl_family(fapl, fam_size, H5P_DEFAULT) < 0)
             goto error;
@@ -945,7 +956,7 @@ h5_get_vfd_fapl(hid_t fapl)
         unsigned log_flags = H5FD_LOG_LOC_IO | H5FD_LOG_ALLOC;
 
         /* Were special log file flags specified in the environment variable? */
-        if((tok = HDstrtok(NULL, " \t\n\r")))
+        if((tok = HDstrtok_r(NULL, " \t\n\r", &lasts)))
             log_flags = (unsigned)HDstrtol(tok, NULL, 0);
 
         if(H5Pset_fapl_log(fapl, NULL, log_flags, (size_t)0) < 0)
@@ -990,6 +1001,7 @@ h5_get_libver_fapl(hid_t fapl)
 {
     const char  *env = NULL;    /* HDF5_DRIVER environment variable     */
     const char  *tok = NULL;    /* strtok pointer                       */
+    char        *lasts = NULL;  /* Context pointer for strtok_r() call */
     char        buf[1024];      /* buffer for tokenizing HDF5_DRIVER    */
 
     /* Get the environment variable, if it exists */
@@ -1012,7 +1024,7 @@ h5_get_libver_fapl(hid_t fapl)
      */
     HDstrncpy(buf, env, sizeof(buf));
     buf[sizeof(buf) - 1] = '\0';
-    if(NULL == (tok = HDstrtok(buf, " \t\n\r")))
+    if(NULL == (tok = HDstrtok_r(buf, " \t\n\r", &lasts)))
         goto done;
 
     if(!HDstrcmp(tok, "latest")) {
@@ -1040,7 +1052,7 @@ error:
  *              fapl but with a VOL connector set according to the constant
  *              or environment variable HDF5_VOL_CONNECTOR.
  *
- * Return:      Success:    A file access property list ID
+ * Return:      Success:    0
  *              Failure:    -1
  *
  * Programmer:  Jordan Henderson
@@ -1053,6 +1065,7 @@ h5_get_vol_fapl(hid_t fapl)
 {
     const char *env = NULL;
     const char *tok = NULL;
+    char        *lasts = NULL;  /* Context pointer for strtok_r() call */
     htri_t      connector_is_registered;
     char        buf[1024];              /* Buffer for tokenizing HDF5_VOL_CONNECTOR */
     void       *vol_info = NULL;        /* VOL connector info */
@@ -1075,7 +1088,7 @@ h5_get_vol_fapl(hid_t fapl)
      */
     HDstrncpy(buf, env, sizeof(buf));
     buf[sizeof(buf) - 1] = '\0';
-    if(NULL == (tok = HDstrtok(buf, " \t\n\r")))
+    if(NULL == (tok = HDstrtok_r(buf, " \t\n\r", &lasts)))
         goto done;
 
     /* First, check to see if the connector is already registered */
@@ -1105,7 +1118,7 @@ h5_get_vol_fapl(hid_t fapl)
     } /* end else */
 
     /* Was there any connector info specified in the environment variable? */
-    if(NULL != (tok = HDstrtok(NULL, " \t\n\r")))
+    if(NULL != (tok = HDstrtok_r(NULL, " \t\n\r", &lasts)))
         if(H5VLconnector_str_to_info(tok, connector_id, &vol_info) < 0)
             goto error;
 
@@ -1925,6 +1938,42 @@ static herr_t dummy_vfd_read(H5FD_t H5_ATTR_UNUSED *_file, H5FD_mem_t H5_ATTR_UN
 static herr_t dummy_vfd_write(H5FD_t *_file, H5FD_mem_t type, hid_t fapl_id, haddr_t addr, size_t size, const void *buf);
 static herr_t dummy_vfd_write(H5FD_t H5_ATTR_UNUSED *_file, H5FD_mem_t H5_ATTR_UNUSED type, hid_t H5_ATTR_UNUSED fapl_id, haddr_t H5_ATTR_UNUSED addr, size_t H5_ATTR_UNUSED size, const void H5_ATTR_UNUSED *buf) { return FAIL; }
 
+/* Dummy VFD with the minimum parameters to make a VFD that can be registered */
+static const H5FD_class_t H5FD_dummy_g = {
+    "dummy",                    /* name         */
+    1,                          /* maxaddr      */
+    H5F_CLOSE_WEAK,             /* fc_degree    */
+    NULL,                       /* terminate    */
+    NULL,                       /* sb_size      */
+    NULL,                       /* sb_encode    */
+    NULL,                       /* sb_decode    */
+    0,                          /* fapl_size    */
+    NULL,                       /* fapl_get     */
+    NULL,                       /* fapl_copy    */
+    NULL,                       /* fapl_free    */
+    0,                          /* dxpl_size    */
+    NULL,                       /* dxpl_copy    */
+    NULL,                       /* dxpl_free    */
+    dummy_vfd_open,             /* open         */
+    dummy_vfd_close,            /* close        */
+    NULL,                       /* cmp          */
+    NULL,                       /* query        */
+    NULL,                       /* get_type_map */
+    NULL,                       /* alloc        */
+    NULL,                       /* free         */
+    dummy_vfd_get_eoa,          /* get_eoa      */
+    dummy_vfd_set_eoa,          /* set_eoa      */
+    dummy_vfd_get_eof,          /* get_eof      */
+    NULL,                       /* get_handle   */
+    dummy_vfd_read,             /* read         */
+    dummy_vfd_write,            /* write        */
+    NULL,                       /* flush        */
+    NULL,                       /* truncate     */
+    NULL,                       /* lock         */
+    NULL,                       /* unlock       */
+    H5FD_FLMAP_DICHOTOMY	/* fl_map       */
+};
+
 
 /*-------------------------------------------------------------------------
  * Function:    h5_get_dummy_vfd_class()
@@ -1952,21 +2001,11 @@ h5_get_dummy_vfd_class(void)
     H5FD_class_t *vfd_class = NULL;     /* Dummy VFD that will be returned */
 
     /* Create the class and initialize everything to zero/NULL */
-    if(NULL == (vfd_class = (H5FD_class_t *)HDcalloc((size_t)1, sizeof(H5FD_class_t))))
+    if(NULL == (vfd_class = (H5FD_class_t *)HDmalloc(sizeof(H5FD_class_t))))
         TEST_ERROR;
 
-    /* Fill in the minimum parameters to make a VFD that
-     * can be registered.
-     */
-    vfd_class->name = "dummy";
-    vfd_class->maxaddr = 1;
-    vfd_class->open = dummy_vfd_open;
-    vfd_class->close = dummy_vfd_close;
-    vfd_class->get_eoa = dummy_vfd_get_eoa;
-    vfd_class->set_eoa = dummy_vfd_set_eoa;
-    vfd_class->get_eof = dummy_vfd_get_eof;
-    vfd_class->read = dummy_vfd_read;
-    vfd_class->write = dummy_vfd_write;
+    /* Copy the dummy VFD */
+    HDmemcpy(vfd_class, &H5FD_dummy_g, sizeof(H5FD_class_t));
 
     return vfd_class;
 
diff --git a/test/h5test.h b/test/h5test.h
index c72f389..66a7863 100644
--- a/test/h5test.h
+++ b/test/h5test.h
@@ -102,7 +102,7 @@ H5TEST_DLLVAR MPI_Info h5_io_info_g;         /* MPI INFO object for IO */
  * the H5_FAILED() macro is invoked automatically when an API function fails.
  */
 #define TESTING(WHAT)  {printf("Testing %-62s",WHAT); fflush(stdout);}
-#define TESTING_2(WHAT)  {printf(" Testing %-62s",WHAT); fflush(stdout);}
+#define TESTING_2(WHAT)  {printf("  Testing %-60s",WHAT); fflush(stdout);}
 #define PASSED()  {puts(" PASSED");fflush(stdout);}
 #define H5_FAILED()  {puts("*FAILED*");fflush(stdout);}
 #define H5_WARNING()  {puts("*WARNING*");fflush(stdout);}
@@ -121,6 +121,11 @@ H5TEST_DLLVAR MPI_Info h5_io_info_g;         /* MPI INFO object for IO */
 #define ALARM_ON  TestAlarmOn()
 #define ALARM_OFF  HDalarm(0)
 
+/* Flags for h5_fileaccess_flags() */
+#define H5_FILEACCESS_VFD       0x01
+#define H5_FILEACCESS_VOL       0x02
+#define H5_FILEACCESS_LIBVER    0x04
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -132,6 +137,7 @@ H5TEST_DLL char *h5_fixname(const char *base_name, hid_t fapl, char *fullname, s
 H5TEST_DLL char *h5_fixname_no_suffix(const char *base_name, hid_t fapl, char *fullname, size_t size);
 H5TEST_DLL char *h5_fixname_printf(const char *base_name, hid_t fapl, char *fullname, size_t size);
 H5TEST_DLL hid_t h5_fileaccess(void);
+H5TEST_DLL hid_t h5_fileaccess_flags(unsigned flags);
 H5TEST_DLL void h5_no_hwconv(void);
 H5TEST_DLL const char *h5_rmprefix(const char *filename);
 H5TEST_DLL void h5_reset(void);
diff --git a/test/links.c b/test/links.c
index e0dc39e..520f784 100644
--- a/test/links.c
+++ b/test/links.c
@@ -315,6 +315,8 @@ typedef struct {
     const obj_visit_t *info;    /* Pointer to the object visit structure to use */
 } ovisit_ud_t;
 
+static hid_t dcpl_g; /* for [un]minimized dataset object headers */
+
 
 
 /*-------------------------------------------------------------------------
@@ -377,7 +379,7 @@ mklinks(hid_t fapl, hbool_t new_format)
     if(H5Gclose(grp) < 0) TEST_ERROR
 
     /* Create a dataset */
-    if((d1 = H5Dcreate2(file, "d1", H5T_NATIVE_INT, scalar, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) TEST_ERROR
+    if((d1 = H5Dcreate2(file, "d1", H5T_NATIVE_INT, scalar, H5P_DEFAULT, dcpl_g, H5P_DEFAULT)) < 0) TEST_ERROR
     if(H5Dclose(d1) < 0) TEST_ERROR
 
     /* Create a hard link */
@@ -451,8 +453,8 @@ new_links(hid_t fapl, hbool_t new_format)
     if((grp2_b = H5Gcreate2(file_b, "grp2", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) TEST_ERROR
 
     /* Create datasets */
-    if((dset1 = H5Dcreate2(file_a, "dataset1", H5T_NATIVE_INT, scalar, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) TEST_ERROR
-    if((dset2 = H5Dcreate2(grp1_a, "dataset2", H5T_NATIVE_INT, scalar, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) TEST_ERROR
+    if((dset1 = H5Dcreate2(file_a, "dataset1", H5T_NATIVE_INT, scalar, H5P_DEFAULT, dcpl_g, H5P_DEFAULT)) < 0) TEST_ERROR
+    if((dset2 = H5Dcreate2(grp1_a, "dataset2", H5T_NATIVE_INT, scalar, H5P_DEFAULT, dcpl_g, H5P_DEFAULT)) < 0) TEST_ERROR
 
     /* Create links within a file.  Both of source and destination use
      * H5L_SAME_LOC.  Both hard and soft links should fail. */
@@ -545,7 +547,7 @@ cklinks(hid_t fapl, hbool_t new_format)
     if(H5Oget_info_by_name2(file, "grp1/hard", &oinfo2, H5O_INFO_BASIC, H5P_DEFAULT) < 0) FAIL_STACK_ERROR
     if(H5O_TYPE_DATASET != oinfo2.type) {
 	H5_FAILED();
-	printf("    %d: Unexpected object type should have been a dataset\n", __LINE__);
+	HDprintf("    %d: Unexpected object type should have been a dataset\n", __LINE__);
 	TEST_ERROR
     } /* end if */
     if(H5F_addr_ne(oinfo1.addr, oinfo2.addr)) {
@@ -580,7 +582,7 @@ cklinks(hid_t fapl, hbool_t new_format)
     if(H5Oget_info_by_name2(file, "grp1/soft", &oinfo2, H5O_INFO_BASIC, H5P_DEFAULT) < 0) FAIL_STACK_ERROR
     if(H5O_TYPE_DATASET != oinfo2.type) {
 	H5_FAILED();
-	printf("    %d: Unexpected object type should have been a dataset\n", __LINE__);
+	HDprintf("    %d: Unexpected object type should have been a dataset\n", __LINE__);
 	TEST_ERROR
     } /* end if */
     if(H5F_addr_ne(oinfo1.addr, oinfo2.addr)) {
@@ -609,12 +611,12 @@ cklinks(hid_t fapl, hbool_t new_format)
     if(H5Lget_info(file, "grp1/dangle", &linfo2, H5P_DEFAULT) < 0) FAIL_STACK_ERROR
     if(H5L_TYPE_SOFT != linfo2.type) {
 	H5_FAILED();
-	printf("    %d: Unexpected object type should have been a symbolic link\n", __LINE__);
+	HDprintf("    %d: Unexpected object type should have been a symbolic link\n", __LINE__);
 	TEST_ERROR
     } /* end if */
     if(H5Lget_val(file, "grp1/dangle", linkval, sizeof linkval, H5P_DEFAULT) < 0) {
 	H5_FAILED();
-	printf("    %d: Can't retrieve link value\n", __LINE__);
+	HDprintf("    %d: Can't retrieve link value\n", __LINE__);
 	TEST_ERROR
     } /* end if */
     if(HDstrcmp(linkval, "foobar")) {
@@ -636,12 +638,12 @@ cklinks(hid_t fapl, hbool_t new_format)
     if(H5Lget_info(file, "grp1/recursive", &linfo2, H5P_DEFAULT) < 0) FAIL_STACK_ERROR
     if(H5L_TYPE_SOFT != linfo2.type) {
 	H5_FAILED();
-	printf("    %d: Unexpected object type should have been a symbolic link\n", __LINE__);
+	HDprintf("    %d: Unexpected object type should have been a symbolic link\n", __LINE__);
 	TEST_ERROR
     } /* end if */
     if(H5Lget_val(file, "grp1/recursive", linkval, sizeof linkval, H5P_DEFAULT) < 0) {
 	H5_FAILED();
-	printf("    %d: Can't retrieve link value\n", __LINE__);
+	HDprintf("    %d: Can't retrieve link value\n", __LINE__);
 	TEST_ERROR
     } /* end if */
     if(HDstrcmp(linkval, "/grp1/recursive")) {
@@ -706,7 +708,7 @@ ck_new_links(hid_t fapl, hbool_t new_format)
     /* Check hard links */
     if(H5O_TYPE_DATASET != oi_hard1.type || H5O_TYPE_DATASET != oi_hard2.type) {
 	H5_FAILED();
-	printf("    %d: Unexpected object type should have been a dataset\n", __LINE__);
+	HDprintf("    %d: Unexpected object type should have been a dataset\n", __LINE__);
 	TEST_ERROR
     }
     if(H5F_addr_ne(oi_dset.addr, oi_hard1.addr) || H5F_addr_ne(oi_dset.addr, oi_hard2.addr)) {
@@ -1014,7 +1016,7 @@ test_lcpl(hid_t fapl, hbool_t new_format)
     if((space_id=H5Screate_simple(2 ,dims, NULL)) < 0) TEST_ERROR
 
     /* Create a dataset using the default LCPL */
-    if((dset_id = H5Dcreate2(file_id, "/dataset", H5T_NATIVE_INT, space_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) TEST_ERROR
+    if((dset_id = H5Dcreate2(file_id, "/dataset", H5T_NATIVE_INT, space_id, H5P_DEFAULT, dcpl_g, H5P_DEFAULT)) < 0) TEST_ERROR
     if(H5Dclose(dset_id) < 0) TEST_ERROR
 
     /* Check that its character encoding is the default */
@@ -1043,7 +1045,7 @@ test_lcpl(hid_t fapl, hbool_t new_format)
     if(linfo.cset != H5T_CSET_UTF8) TEST_ERROR
 
     /* Create a dataset using the new LCPL */
-    if((dset_id = H5Dcreate2(file_id, "/dataset2", H5T_NATIVE_INT, space_id, lcpl_id, H5P_DEFAULT, H5P_DEFAULT)) < 0) TEST_ERROR
+    if((dset_id = H5Dcreate2(file_id, "/dataset2", H5T_NATIVE_INT, space_id, lcpl_id, dcpl_g, H5P_DEFAULT)) < 0) TEST_ERROR
     if(H5Dclose(dset_id) < 0) TEST_ERROR
 
     /* Check that its character encoding is UTF-8 */
@@ -2602,7 +2604,7 @@ external_link_toomany(hid_t fapl, hbool_t new_format)
     } H5E_END_TRY;
     if (gid >= 0) {
 	H5_FAILED();
-	printf("%d:    Should have failed for sequence of too many nested links.", __LINE__);
+	HDprintf("%d:    Should have failed for sequence of too many nested links.", __LINE__);
 	goto error;
     }
 
@@ -3758,7 +3760,11 @@ external_set_elink_fapl2(hid_t fapl, hbool_t new_format)
     if((space = H5Screate_simple(2, dims, NULL)) < 0) TEST_ERROR
 
     /* Create dataset creation property list */
-    if((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0) TEST_ERROR;
+    if (dcpl_g == H5P_DEFAULT)
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+    else
+        dcpl = H5Pcopy(dcpl_g);
+    if (0 > dcpl) TEST_ERROR;
     if(H5Pset_alloc_time(dcpl, H5D_ALLOC_TIME_LATE) < 0) TEST_ERROR;
 
     /* create "Dataset" in group "A" of target file */
@@ -6100,7 +6106,7 @@ external_link_closing(hid_t fapl, hbool_t new_format)
     /* Test creating each kind of object */
     if((gid = H5Gcreate2(fid1, "elink/elink/elink/group1", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) TEST_ERROR
     if(H5Tcommit2(fid1, "elink/elink/elink/type1", tid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT) < 0) TEST_ERROR
-    if((did = H5Dcreate2(fid1, "elink/elink/elink/dataset1", tid2, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) TEST_ERROR
+    if((did = H5Dcreate2(fid1, "elink/elink/elink/dataset1", tid2, sid, H5P_DEFAULT, dcpl_g, H5P_DEFAULT)) < 0) TEST_ERROR
 
     /* Close objects */
     if(H5Gclose(gid) < 0) TEST_ERROR
@@ -7298,7 +7304,7 @@ external_open_twice(hid_t fapl, hbool_t new_format)
     if((space = H5Screate(H5S_SCALAR)) < 0)
         TEST_ERROR
     if((oid1 = H5Dcreate2(fid2, "dset", H5T_NATIVE_INT, space, H5P_DEFAULT,
-            H5P_DEFAULT, H5P_DEFAULT)) < 0)
+            dcpl_g, H5P_DEFAULT)) < 0)
         TEST_ERROR
     if(H5Dclose(oid1) < 0)
         TEST_ERROR
@@ -7514,8 +7520,11 @@ external_link_with_committed_datatype(hid_t fapl, hbool_t new_format)
     if((sid2 = H5Screate_simple(2, dims, NULL)) < 0)
         FAIL_STACK_ERROR
 
-    if((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
-        FAIL_STACK_ERROR
+    if (dcpl_g == H5P_DEFAULT)
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+    else
+        dcpl = H5Pcopy(dcpl_g);
+    if (0 > dcpl) FAIL_STACK_ERROR
     if(H5Pset_chunk(dcpl, 2, chunks) < 0)
         FAIL_STACK_ERROR
 
@@ -7743,7 +7752,6 @@ done:
             case H5I_FILE:
             case H5I_DATASPACE:
             case H5I_ATTR:
-            case H5I_REFERENCE:
             case H5I_VFL:
             case H5I_VOL:
             case H5I_GENPROP_CLS:
@@ -7832,7 +7840,6 @@ done:
             case H5I_FILE:
             case H5I_DATASPACE:
             case H5I_ATTR:
-            case H5I_REFERENCE:
             case H5I_VFL:
             case H5I_VOL:
             case H5I_GENPROP_CLS:
@@ -8816,6 +8823,12 @@ ud_link_errors(hid_t fapl, hbool_t new_format)
             TEST_ERROR
     } H5E_END_TRY
 
+    /* Try to create a link with H5Lcreate_ud that has a NULL udata pointer, but a non-zero udata_size value */
+    H5E_BEGIN_TRY {
+        if(H5Lcreate_ud(fid, "/ud_link", (H5L_type_t)UD_CBFAIL_TYPE, NULL, 1, H5P_DEFAULT, H5P_DEFAULT) >= 0)
+            TEST_ERROR
+    } H5E_END_TRY;
+
     /* Create a user-defined link to the group. */
     strcpy(group_name, "/group");
     if(H5Lcreate_ud(fid, "/ud_link", (H5L_type_t)UD_CBFAIL_TYPE, &group_name, HDstrlen(group_name) + 1, H5P_DEFAULT, H5P_DEFAULT) < 0) FAIL_STACK_ERROR
@@ -9060,7 +9073,7 @@ lapl_nlinks(hid_t fapl, hbool_t new_format)
     dims[0] = 2;
     dims[1] = 2;
     if((sid = H5Screate_simple(2, dims, NULL)) < 0) TEST_ERROR
-    if((did = H5Dcreate2(gid, "dataset", H5T_NATIVE_INT, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) TEST_ERROR
+    if((did = H5Dcreate2(gid, "dataset", H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl_g, H5P_DEFAULT)) < 0) TEST_ERROR
     if(H5Dclose(did) < 0) TEST_ERROR
 
     /* Close group */
@@ -9172,7 +9185,7 @@ linkinfo(hid_t fapl, hbool_t new_format)
     if(H5Lcreate_soft("group", fid, "softlink", H5P_DEFAULT, H5P_DEFAULT) < 0) FAIL_STACK_ERROR
 
     if((sid = H5Screate(H5S_SCALAR)) < 0) TEST_ERROR
-    if((did = H5Dcreate2(fid, "dataset", H5T_NATIVE_INT, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) TEST_ERROR
+    if((did = H5Dcreate2(fid, "dataset", H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl_g, H5P_DEFAULT)) < 0) TEST_ERROR
 
     if(H5Lcreate_ud(fid, "ud_link", (H5L_type_t)UD_PLIST_TYPE, NULL, (size_t)0, H5P_DEFAULT, H5P_DEFAULT) < 0) TEST_ERROR
     if(H5Lcreate_external("file_name", "obj_path", fid, "ext_link", H5P_DEFAULT, H5P_DEFAULT) < 0) TEST_ERROR
@@ -9337,13 +9350,13 @@ build_visit_file(hid_t fapl)
     /* Create dataset in each group */
     if((sid = H5Screate(H5S_SCALAR)) < 0) TEST_ERROR
 
-    if((did = H5Dcreate2(fid, "/Dataset_zero", H5T_NATIVE_INT, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) TEST_ERROR
+    if((did = H5Dcreate2(fid, "/Dataset_zero", H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl_g, H5P_DEFAULT)) < 0) TEST_ERROR
     if(H5Dclose(did) < 0) TEST_ERROR
 
-    if((did = H5Dcreate2(fid, "/Group1/Dataset_one", H5T_NATIVE_INT, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) TEST_ERROR
+    if((did = H5Dcreate2(fid, "/Group1/Dataset_one", H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl_g, H5P_DEFAULT)) < 0) TEST_ERROR
     if(H5Dclose(did) < 0) TEST_ERROR
 
-    if((did = H5Dcreate2(fid, "/Group1/Group2/Dataset_two", H5T_NATIVE_INT, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) TEST_ERROR
+    if((did = H5Dcreate2(fid, "/Group1/Group2/Dataset_two", H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl_g, H5P_DEFAULT)) < 0) TEST_ERROR
     if(H5Dclose(did) < 0) TEST_ERROR
 
     if(H5Sclose(sid) < 0) TEST_ERROR
@@ -14892,6 +14905,7 @@ main(void)
     hid_t	fapl, fapl2;    /* File access property lists */
     int	nerrors = 0;
     unsigned new_format;    /* Whether to use the new format or not */
+    unsigned minimize_dset_oh;
     unsigned efc;           /* Whether to use the external file cache */
     const char  *env_h5_drvr;      /* File Driver value from environment */
 
@@ -14902,165 +14916,187 @@ main(void)
     h5_reset();
     fapl = h5_fileaccess();
 
-    /* Copy the file access property list */
+    /* fapl2 uses "latest version bounds" */
     if((fapl2 = H5Pcopy(fapl)) < 0) TEST_ERROR
-
-    /* Set the "use the latest version of the format" bounds for creating objects in the file */
     if(H5Pset_libver_bounds(fapl2, H5F_LIBVER_LATEST, H5F_LIBVER_LATEST) < 0) TEST_ERROR
 
-    /* Loop over using new group format */
-    for(new_format = FALSE; new_format <= TRUE; new_format++) {
-        hid_t my_fapl;
+    for (minimize_dset_oh = 0; minimize_dset_oh <= 1; minimize_dset_oh++) {
+        if (minimize_dset_oh) {
+            HDprintf("\n-Testing with minimzed dataset object headers-\n");
+            dcpl_g = H5Pcreate(H5P_DATASET_CREATE);
+            if (0 > dcpl_g) TEST_ERROR
+        } else {
+            HDprintf("\n-Testing with unminimzed dataset object headers-\n");
+            dcpl_g = H5P_DEFAULT;
+        }
 
-        /* Check for FAPL to use */
-        if(new_format)
-            my_fapl = fapl2;
-        else
-            my_fapl = fapl;
-
-        /* General tests... (on both old & new format groups */
-        nerrors += mklinks(my_fapl, new_format) < 0 ? 1 : 0;
-        nerrors += cklinks(my_fapl, new_format) < 0 ? 1 : 0;
-        nerrors += new_links(my_fapl, new_format) < 0 ? 1 : 0;
-        nerrors += ck_new_links(my_fapl, new_format) < 0 ? 1 : 0;
-        nerrors += long_links(my_fapl, new_format) < 0 ? 1 : 0;
-        nerrors += toomany(my_fapl, new_format) < 0 ? 1 : 0;
-
-        /* Test new H5L link creation routine */
-        nerrors += test_lcpl(my_fapl, new_format);
-        nerrors += test_move(my_fapl, new_format);
-        nerrors += test_copy(my_fapl, new_format);
-        nerrors += test_move_preserves(my_fapl, new_format);
+        for(new_format = FALSE; new_format <= TRUE; new_format++) {
+            hid_t my_fapl;
+
+            /* Check for FAPL to use */
+            if(new_format) {
+                my_fapl = fapl2;
+                HDprintf("\n--Testing with 'new format'--\n");
+            } else {
+                my_fapl = fapl;
+                HDprintf("\n--Testing with 'old format'--\n");
+            }
+
+            /* always enter tests without external cache */
+            if(H5Pset_elink_file_cache_size(my_fapl, 0) < 0)
+                TEST_ERROR
+
+            /* General tests... (on both old & new format groups */
+            nerrors += mklinks(my_fapl, new_format) < 0 ? 1 : 0;
+            nerrors += cklinks(my_fapl, new_format) < 0 ? 1 : 0;
+            nerrors += new_links(my_fapl, new_format) < 0 ? 1 : 0;
+            nerrors += ck_new_links(my_fapl, new_format) < 0 ? 1 : 0;
+            nerrors += long_links(my_fapl, new_format) < 0 ? 1 : 0;
+            nerrors += toomany(my_fapl, new_format) < 0 ? 1 : 0;
+
+            /* Test new H5L link creation routine */
+            nerrors += test_lcpl(my_fapl, new_format);
+            nerrors += test_move(my_fapl, new_format);
+            nerrors += test_copy(my_fapl, new_format);
+            nerrors += test_move_preserves(my_fapl, new_format);
 #ifndef H5_NO_DEPRECATED_SYMBOLS
-        nerrors += test_deprec(my_fapl, new_format);
+            nerrors += test_deprec(my_fapl, new_format);
 #endif /* H5_NO_DEPRECATED_SYMBOLS */
 
-        /* tests for external link */
-        /* Test external file cache first, so it sees the default efc setting on
-         * the fapl */
-        nerrors += external_file_cache(my_fapl, new_format) < 0 ? 1 : 0;
-
-        /* This test cannot run with the EFC because it assumes that an
-         * intermediate file is not held open */
-        nerrors += external_link_mult(my_fapl, new_format) < 0 ? 1 : 0;
-
-        /* This test cannot run with the EFC because the EFC cannot currently
-         * reopen a cached file with a different intent */
-        nerrors += external_set_elink_acc_flags(env_h5_drvr, my_fapl, new_format) < 0 ? 1 : 0;
-
-        /* Try external link tests both with and without the external file cache
-         */
-        for(efc = FALSE; efc <= TRUE; efc++) {
-            if(efc) {
-                if(H5Pset_elink_file_cache_size(my_fapl, 8) < 0)
-                    TEST_ERROR
-                printf("\n---Testing with external file cache---\n");
-            } /* end if */
-            else {
-                if(H5Pset_elink_file_cache_size(my_fapl, 0) < 0)
-                    TEST_ERROR
-                printf("\n---Testing without external file cache---\n");
-            } /* end else */
+            /* tests for external link */
+            /* Test external file cache first, so it sees the default efc setting on
+             * the fapl */
+            nerrors += external_file_cache(my_fapl, new_format) < 0 ? 1 : 0;
+
+            /* This test cannot run with the EFC because it assumes that an
+             * intermediate file is not held open */
+            nerrors += external_link_mult(my_fapl, new_format) < 0 ? 1 : 0;
+
+            /* This test cannot run with the EFC because the EFC cannot currently
+             * reopen a cached file with a different intent */
+            nerrors += external_set_elink_acc_flags(env_h5_drvr, my_fapl, new_format) < 0 ? 1 : 0;
+
+            /* Try external link tests both with and without the external file cache
+             */
+            for(efc = FALSE; efc <= TRUE; efc++) {
+                if(efc) {
+                    if(H5Pset_elink_file_cache_size(my_fapl, 8) < 0)
+                        TEST_ERROR
+                    HDprintf("\n---Testing with external file cache---\n");
+                } /* end if */
+                else {
+                    if(H5Pset_elink_file_cache_size(my_fapl, 0) < 0)
+                        TEST_ERROR
+                    HDprintf("\n---Testing without external file cache---\n");
+                } /* end else */
 
-            nerrors += external_link_root(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_path(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_self(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_pingpong(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_toomany(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_dangling(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_recursive(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_query(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_unlink_compact(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_unlink_dense(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_move(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_ride(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_closing(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_endian(new_format) < 0 ? 1 : 0;
-            nerrors += external_link_strong(my_fapl, new_format) < 0 ? 1 : 0;
-
-            nerrors += external_link_prefix(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_abs_mainpath(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_rel_mainpath(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_cwd(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_abstar(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_abstar_cur(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_reltar(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_chdir(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_set_elink_fapl1(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_set_elink_fapl2(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_set_elink_fapl3(new_format) < 0 ? 1 : 0;
-            nerrors += external_set_elink_cb(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_root(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_path(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_self(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_pingpong(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_toomany(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_dangling(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_recursive(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_query(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_unlink_compact(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_unlink_dense(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_move(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_ride(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_closing(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_endian(new_format) < 0 ? 1 : 0;
+                nerrors += external_link_strong(my_fapl, new_format) < 0 ? 1 : 0;
+
+                nerrors += external_link_prefix(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_abs_mainpath(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_rel_mainpath(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_cwd(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_abstar(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_abstar_cur(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_reltar(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_chdir(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_set_elink_fapl1(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_set_elink_fapl2(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_set_elink_fapl3(new_format) < 0 ? 1 : 0;
+                nerrors += external_set_elink_cb(my_fapl, new_format) < 0 ? 1 : 0;
 #ifdef H5_HAVE_WINDOW_PATH
-            nerrors += external_link_win1(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_win2(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_win3(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_win4(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_win5(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_win6(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_win7(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_win8(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_win9(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_win1(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_win2(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_win3(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_win4(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_win5(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_win6(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_win7(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_win8(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_link_win9(my_fapl, new_format) < 0 ? 1 : 0;
 #endif
-            nerrors += external_symlink(env_h5_drvr, my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_copy_invalid_object(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_dont_fail_to_source(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_open_twice(my_fapl, new_format) < 0 ? 1 : 0;
-            nerrors += external_link_with_committed_datatype(my_fapl, new_format) < 0 ? 1 : 0;
-        } /* end for */
-
-        /* These tests assume that external links are a form of UD links,
-         * so assume that everything that passed for external links
-         * above has already been tested for UD links.
-         */
-        if(new_format == TRUE) {
-            nerrors += ud_hard_links(fapl2) < 0 ? 1 : 0;     /* requires new format groups */
-            nerrors += ud_link_reregister(fapl2) < 0 ? 1 : 0;        /* requires new format groups */
-        } /* end if */
-        nerrors += ud_callbacks(my_fapl, new_format) < 0 ? 1 : 0;
-        nerrors += ud_link_errors(my_fapl, new_format) < 0 ? 1 : 0;
-        nerrors += lapl_udata(my_fapl, new_format) < 0 ? 1 : 0;
-        nerrors += lapl_nlinks(my_fapl, new_format) < 0 ? 1 : 0;
-        nerrors += linkinfo(my_fapl, new_format) < 0 ? 1 : 0;
-
-        /* Misc. extra tests, useful for both new & old format files */
-        nerrors += link_visit(my_fapl, new_format) < 0 ? 1 : 0;
-        nerrors += link_visit_by_name(my_fapl, new_format) < 0 ? 1 : 0;
-        nerrors += obj_visit(my_fapl, new_format) < 0 ? 1 : 0;
-        nerrors += obj_visit_by_name(my_fapl, new_format) < 0 ? 1 : 0;
-        nerrors += obj_visit_stop(my_fapl, new_format) < 0 ? 1 : 0;
-        nerrors += link_filters(my_fapl, new_format) < 0 ? 1 : 0;
-        nerrors += obj_exists(my_fapl, new_format) < 0 ? 1 : 0;
-
-        /* Keep this test last, it's testing files that are used above */
-        /* do not do this for files used by external link tests */
-        nerrors += check_all_closed(my_fapl, new_format, EXTSTOP) < 0 ? 1 : 0;
-    } /* end for */
+                nerrors += external_symlink(env_h5_drvr, my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_copy_invalid_object(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_dont_fail_to_source(my_fapl, new_format) < 0 ? 1 : 0;
+                nerrors += external_open_twice(my_fapl, new_format) < 0 ? 1 : 0;
+	        nerrors += external_link_with_committed_datatype(my_fapl, new_format) < 0 ? 1 : 0;
+            } /* with/without external file cache */
+
+            /* These tests assume that external links are a form of UD links,
+             * so assume that everything that passed for external links
+             * above has already been tested for UD links.
+             */
+            if(new_format == TRUE) {
+                nerrors += ud_hard_links(fapl2) < 0 ? 1 : 0;     /* requires new format groups */
+                nerrors += ud_link_reregister(fapl2) < 0 ? 1 : 0;        /* requires new format groups */
+            } /* end if */
+            nerrors += ud_callbacks(my_fapl, new_format) < 0 ? 1 : 0;
+            nerrors += ud_link_errors(my_fapl, new_format) < 0 ? 1 : 0;
+            nerrors += lapl_udata(my_fapl, new_format) < 0 ? 1 : 0;
+            nerrors += lapl_nlinks(my_fapl, new_format) < 0 ? 1 : 0;
+            nerrors += linkinfo(my_fapl, new_format) < 0 ? 1 : 0;
+
+            /* Misc. extra tests, useful for both new & old format files */
+            nerrors += link_visit(my_fapl, new_format) < 0 ? 1 : 0;
+            nerrors += link_visit_by_name(my_fapl, new_format) < 0 ? 1 : 0;
+            nerrors += obj_visit(my_fapl, new_format) < 0 ? 1 : 0;
+            nerrors += obj_visit_by_name(my_fapl, new_format) < 0 ? 1 : 0;
+            nerrors += obj_visit_stop(my_fapl, new_format) < 0 ? 1 : 0;
+            nerrors += link_filters(my_fapl, new_format) < 0 ? 1 : 0;
+            nerrors += obj_exists(my_fapl, new_format) < 0 ? 1 : 0;
+
+            /* Keep this test last, it's testing files that are used above */
+            /* do not do this for files used by external link tests */
+            nerrors += check_all_closed(my_fapl, new_format, EXTSTOP) < 0 ? 1 : 0;
+        } /* new/old format */
+
+        /* New group revision feature tests */
+        nerrors += corder_create_empty(fapl2) < 0 ? 1 : 0;
 
-    /* New group revision feature tests */
-    nerrors += corder_create_empty(fapl2) < 0 ? 1 : 0;
 /* XXX: when creation order indexing is fully working, go back and add checks
 *      to these tests to make certain that the creation order values are
 *      correct.
 */
-    nerrors += corder_create_compact(fapl2) < 0 ? 1 : 0;
-    nerrors += corder_create_dense(fapl2) < 0 ? 1 : 0;
-    nerrors += corder_transition(fapl2) < 0 ? 1 : 0;
-    nerrors += corder_delete(fapl2) < 0 ? 1 : 0;
-    nerrors += link_info_by_idx(fapl2) < 0 ? 1 : 0;
-    nerrors += delete_by_idx(fapl2) < 0 ? 1 : 0;
-    nerrors += link_iterate(fapl2) < 0 ? 1 : 0;
-    nerrors += open_by_idx(fapl2) < 0 ? 1 : 0;
-    nerrors += object_info(fapl2) < 0 ? 1 : 0;
-    nerrors += group_info(fapl2) < 0 ? 1 : 0;
-    nerrors += timestamps(fapl2) < 0 ? 1 : 0;
-
-    /* Test new API calls on old-style groups */
-    nerrors += link_info_by_idx_old(fapl) < 0 ? 1 : 0;
-    nerrors += delete_by_idx_old(fapl) < 0 ? 1 : 0;
-    nerrors += link_iterate_old(fapl) < 0 ? 1 : 0;
-    nerrors += open_by_idx_old(fapl) < 0 ? 1 : 0;
-    nerrors += object_info_old(fapl) < 0 ? 1 : 0;
-    nerrors += group_info_old(fapl) < 0 ? 1 : 0;
+        nerrors += corder_create_compact(fapl2) < 0 ? 1 : 0;
+        nerrors += corder_create_dense(fapl2) < 0 ? 1 : 0;
+        nerrors += corder_transition(fapl2) < 0 ? 1 : 0;
+        nerrors += corder_delete(fapl2) < 0 ? 1 : 0;
+        nerrors += link_info_by_idx(fapl2) < 0 ? 1 : 0;
+        nerrors += delete_by_idx(fapl2) < 0 ? 1 : 0;
+        nerrors += link_iterate(fapl2) < 0 ? 1 : 0;
+        nerrors += open_by_idx(fapl2) < 0 ? 1 : 0;
+        nerrors += object_info(fapl2) < 0 ? 1 : 0;
+        nerrors += group_info(fapl2) < 0 ? 1 : 0;
+        nerrors += timestamps(fapl2) < 0 ? 1 : 0;
+
+        /* Test new API calls on old-style groups */
+        nerrors += link_info_by_idx_old(fapl) < 0 ? 1 : 0;
+        nerrors += delete_by_idx_old(fapl) < 0 ? 1 : 0;
+        nerrors += link_iterate_old(fapl) < 0 ? 1 : 0;
+        nerrors += open_by_idx_old(fapl) < 0 ? 1 : 0;
+        nerrors += object_info_old(fapl) < 0 ? 1 : 0;
+        nerrors += group_info_old(fapl) < 0 ? 1 : 0;
+
+        if (minimize_dset_oh) {
+            if (H5Pclose(dcpl_g) < 0)
+                TEST_ERROR;
+            dcpl_g = -1;
+        }
+    } /* [un]minimized dataset object headers */
 
     /* Close 2nd FAPL */
     H5Pclose(fapl2);
@@ -15077,11 +15113,11 @@ main(void)
 
     /* Results */
     if(nerrors) {
-        printf("***** %d LINK TEST%s FAILED! *****\n",
+        HDprintf("***** %d LINK TEST%s FAILED! *****\n",
                 nerrors, 1 == nerrors ? "" : "S");
         HDexit(EXIT_FAILURE);
     }
-    printf("All link tests passed.\n");
+    HDprintf("All link tests passed.\n");
 
     /* clean up symlink created by external link tests */
     HDremove(SYMLINK1);
diff --git a/test/echo_vol.c b/test/null_vol_connector.c
index 7f59832..b62b370 100644
--- a/test/echo_vol.c
+++ b/test/null_vol_connector.c
@@ -10,19 +10,20 @@
  * help@hdfgroup.org.                                                        *
  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
-/*
- * Purpose:     A simple virtual object layer (VOL) plugin that just echoes
- *              the name of the API call.
+/* Purpose:     A simple virtual object layer (VOL) connector with almost no
+ *              functionality that is used for testing basic plugin handling
+ *              (registration, etc.).
  */
 
 #include "H5PLextern.h"
 
-/* The VOL class struct.
- */
-static const H5VL_class_t echo_vol_g = {
+#include "null_vol_connector.h"
+
+/* The VOL class struct */
+static const H5VL_class_t null_vol_g = {
     0,                                              /* version      */
-    (H5VL_class_value_t)501,                        /* value        */
-    "echo",                                         /* name         */
+    NULL_VOL_CONNECTOR_VALUE,                       /* value        */
+    NULL_VOL_CONNECTOR_NAME,                        /* name         */
     0,                                              /* capability flags */
     NULL,                                           /* initialize   */
     NULL,                                           /* terminate    */
@@ -106,22 +107,10 @@ static const H5VL_class_t echo_vol_g = {
     NULL                                            /* optional     */
 };
 
-
-
 /* These two functions are necessary to load this plugin using
  * the HDF5 library.
  */
 
-H5PL_type_t
-H5PLget_plugin_type(void)
-{
-    return H5PL_TYPE_VOL;
-}
-
-
-const void*
-H5PLget_plugin_info(void)
-{
-    return &echo_vol_g;
-}
+H5PL_type_t H5PLget_plugin_type(void) {return H5PL_TYPE_VOL;}
+const void *H5PLget_plugin_info(void) {return &null_vol_g;}
 
diff --git a/test/null_vol_connector.h b/test/null_vol_connector.h
new file mode 100644
index 0000000..11c8826
--- /dev/null
+++ b/test/null_vol_connector.h
@@ -0,0 +1,25 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/* Purpose:     A simple virtual object layer (VOL) connector with almost no
+ *              functionality that is used for testing basic plugin handling
+ *              (registration, etc.).
+ */
+
+#ifndef _null_vol_connector_H
+#define _null_vol_connector_H
+
+#define NULL_VOL_CONNECTOR_VALUE    ((H5VL_class_value_t)160)
+#define NULL_VOL_CONNECTOR_NAME     "null_vol_connector"
+
+#endif /* _null_vol_connector_H */
+
diff --git a/test/objcopy.c b/test/objcopy.c
index 6ee2f72..eb4927f 100644
--- a/test/objcopy.c
+++ b/test/objcopy.c
@@ -7871,7 +7871,7 @@ test_copy_old_layout(hid_t fcpl_dst, hid_t fapl, hbool_t test_open)
     addr_reset();
 
     /* Setup */
-    if((src_fapl = h5_fileaccess()) < 0) TEST_ERROR
+    if((src_fapl = h5_fileaccess_flags(H5_FILEACCESS_VOL | H5_FILEACCESS_LIBVER)) < 0) TEST_ERROR
 
     /* open source file (read-only) */
     if((fid_src = H5Fopen(src_filename, H5F_ACC_RDONLY, src_fapl)) < 0) TEST_ERROR
diff --git a/test/ohdr.c b/test/ohdr.c
index cca7e7e..85554a5 100644
--- a/test/ohdr.c
+++ b/test/ohdr.c
@@ -36,9 +36,16 @@
 
 const char *FILENAME[] = {
     "ohdr",
+    "ohdr_min_a",
+    "ohdr_min_b",
     NULL
 };
 
+/* used for object header size comparison */
+#define EQ 1
+#define LT 2
+#define GT 3
+
 /* The tbogus.h5 is generated from gen_bogus.c in HDF5 'test' directory.
  * To get this data file, define H5O_ENABLE_BOGUS in src/H5Oprivate, rebuild
  * the library and simply compile gen_bogus.c with that HDF5 library and run it.
@@ -514,6 +521,16 @@ test_unknown(unsigned bogus_id, char *filename, hid_t fapl)
 
     PASSED();
 
+    TESTING("object with unknown header message & 'shareable' flag set");
+
+    /* Open the dataset with the unknown header message, adn "shareable" flag */
+    if((did = H5Dopen2(loc_bogus, "Dataset5", H5P_DEFAULT)) < 0)
+        FAIL_STACK_ERROR
+    if(H5Dclose(did) < 0)
+        FAIL_STACK_ERROR
+
+    PASSED();
+
     TESTING("object in r/o file with unknown header message & 'fail if unknown and open for write' flag set");
 
     /* Open the dataset with the unknown header message, and "fail if unknown and open for write" flag */
@@ -733,6 +750,883 @@ error:
     return FAIL;
 } /* test_unknown() */
 
+/*
+ * Set an attribute with the given information.
+ * If the out parameter `attr_id` is negative, a new attribute will be
+ * created with the given information. Else, it will attempt to update the
+ * attribute with the new value.
+ *
+ * `dataspace_id` ignored if `attribute_id` >= 0
+ */
+static herr_t
+put_attribute(hid_t loc_id, const char *attrname, const void *attrvalue, hid_t datatype_id, hid_t dataspace_id, hid_t *attribute_id)
+{   
+    if((*attribute_id) < 0) {
+        hid_t id = -1;
+        id = H5Acreate2(loc_id, attrname, datatype_id, dataspace_id, H5P_DEFAULT, H5P_DEFAULT);
+        if(id < 0) 
+            return FAIL;
+        *attribute_id = id;
+    }
+    return H5Awrite(*attribute_id, datatype_id, attrvalue);
+} /* put_attribute */
+
+/*
+ * Count the number of attributes attached to an object.
+ * Returns negative in event of error.
+ */
+static int
+count_attributes(hid_t dset_id)
+{   
+    H5O_info_t info;
+    
+    if(H5Oget_info2(dset_id, &info, H5O_INFO_ALL) < 0)
+        return -1;
+    else
+        return (int)info.num_attrs; /* should never exceed int bounds */
+} /* count_attributes */
+
+/*
+ * Get the total space used by the object header.
+ * Used by oh_compare()
+ * On success, stores size in `size_out` pointer.
+ */
+static herr_t
+_oh_getsize(hid_t did, hsize_t *size_out)
+{
+    H5O_info_t info;
+    if(FAIL == H5Oget_info2(did, &info, H5O_INFO_HDR))
+        return FAIL;
+    *size_out = info.hdr.space.total;
+    return SUCCEED;
+} /* _oh_getsize */
+
+/*
+ * Compare the TOTAL space used by datasets' object headers.
+ * Returns negative value if an error occurred,
+ * else positive #defined indicator value EQ, LT, GT.
+ */
+static int
+oh_compare(hid_t did1, hid_t did2)
+{
+    hsize_t space1 = 0;
+    hsize_t space2 = 0;
+
+    if(FAIL == _oh_getsize(did1, &space1))
+        return -1;
+    if(FAIL == _oh_getsize(did2, &space2))
+        return -2;
+
+    if(space1 < space2)
+        return LT;
+    else if(space1 > space2)
+        return GT;
+    else
+        return EQ;
+} /* oh_compare() */
+
+/*
+ * Demonstrate attribute addition to datasets.
+ * Conduct additions side-by-side with a standard datataset and one with
+ * minimized dataset object headers.
+ */
+static herr_t
+test_minimized_dset_ohdr_attribute_addition(hid_t fapl_id)
+{
+    hsize_t array_10[1]      = {10}; /* dataspace extent */
+    char    buffer[10]       = "";   /* to inspect string attribute */
+    int     a_out            = 0;
+    char    filename[512]    = "";
+    hid_t   int_type_id      = -1;
+    hid_t   char_type_id     = -1;
+    hid_t   dcpl_id          = -1;
+    hid_t   dspace_id        = -1;
+    hid_t   dspace_scalar_id = -1;
+    hid_t   dset_id          = -1;
+    hid_t   mindset_id       = -1;
+    hid_t   attr_1_id        = -1;
+    hid_t   attr_1a_id       = -1;
+    hid_t   attr_2_id        = -1;
+    hid_t   attr_2a_id       = -1;
+    hid_t   attr_3_id        = -1;
+    hid_t   attr_3a_id       = -1;
+    hid_t   file_id          = -1;
+    herr_t  ret;
+    int     count = 0;
+
+    TESTING("minimized dset object headers attribute additions")
+
+    /*********
+     * SETUP *
+     *********/
+
+    if(h5_fixname(FILENAME[1], fapl_id, filename, sizeof(filename)) == NULL)
+        TEST_ERROR
+
+    dspace_id = H5Screate_simple(1, array_10, NULL);
+    if(dspace_id < 0) TEST_ERROR
+
+    dspace_scalar_id = H5Screate(H5S_SCALAR);
+    if(dspace_scalar_id < 0) TEST_ERROR
+
+    char_type_id = H5Tcopy(H5T_NATIVE_CHAR);
+    if(char_type_id < 0) TEST_ERROR
+
+    int_type_id = H5Tcopy(H5T_NATIVE_INT);
+    if(int_type_id < 0) TEST_ERROR
+
+    dcpl_id = H5Pcreate(H5P_DATASET_CREATE);
+    if(dcpl_id < 0) TEST_ERROR
+
+    ret = H5Pset_dset_no_attrs_hint(dcpl_id, TRUE);
+    if(ret < 0) TEST_ERROR
+
+    file_id = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id);
+    if(file_id < 0) TEST_ERROR
+
+    H5E_BEGIN_TRY {
+        count = count_attributes(dset_id);
+    } H5E_END_TRY;
+    if(count != -1) TEST_ERROR
+
+    dset_id = H5Dcreate2(file_id, "dataset", int_type_id, dspace_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    if(dset_id < 0) TEST_ERROR
+
+    mindset_id  = H5Dcreate2(file_id, "mindataset", int_type_id, dspace_id, H5P_DEFAULT, dcpl_id, H5P_DEFAULT);
+    if(mindset_id < 0) TEST_ERROR
+
+    /********************
+     * TEST/DEMONSTRATE *
+     ********************/
+
+    /* -------------------
+     * no attributes added
+     */
+
+    count = count_attributes(dset_id);
+    if(count != 0) TEST_ERROR
+    count = count_attributes(mindset_id);
+    if(count != 0) TEST_ERROR
+
+    /* -----------------
+     * add one attribute
+     */
+    ret = put_attribute(dset_id, "PURPOSE", "DEMO", char_type_id, dspace_id, &attr_1_id);
+    if(ret < 0) TEST_ERROR
+
+    ret = put_attribute(mindset_id, "PURPOSE", "DEMO", char_type_id, dspace_id, &attr_1a_id);
+    if(ret < 0) TEST_ERROR
+
+    count = count_attributes(dset_id);
+    if(count != 1) TEST_ERROR
+    count = count_attributes(mindset_id);
+    if(count != 1) TEST_ERROR
+
+    ret = H5Aread(attr_1_id, char_type_id, buffer);
+    if(ret < 0) TEST_ERROR
+    if(HDstrcmp("DEMO", buffer)) TEST_ERROR
+
+    ret = H5Aread(attr_1a_id, char_type_id, buffer);
+    if(ret < 0) TEST_ERROR
+    if(HDstrcmp("DEMO", buffer)) TEST_ERROR
+
+    /* -----------------
+     * modify one attribute
+     */
+
+    ret = put_attribute(dset_id, "PURPOSE", "REWRITE", char_type_id, -1, &attr_1_id);
+    if(ret < 0) TEST_ERROR
+
+    ret = put_attribute(mindset_id, "PURPOSE", "REWRITE", char_type_id, -1, &attr_1a_id);
+    if(ret < 0) TEST_ERROR
+
+    count = count_attributes(dset_id);
+    if(count != 1) TEST_ERROR
+    count = count_attributes(mindset_id);
+    if(count != 1) TEST_ERROR
+
+    ret = H5Aread(attr_1_id, char_type_id, buffer);
+    if(ret < 0) TEST_ERROR
+    if(HDstrcmp("REWRITE", buffer)) TEST_ERROR
+
+    ret = H5Aread(attr_1a_id, char_type_id, buffer);
+    if(ret < 0) TEST_ERROR
+    if(HDstrcmp("REWRITE", buffer)) TEST_ERROR
+
+    /* -----------------
+     * add second attribute
+     */
+
+    a_out = 5;
+    ret = put_attribute(dset_id, "RANK", &a_out, int_type_id, dspace_scalar_id, &attr_2_id);
+    if(ret < 0) TEST_ERROR
+
+    a_out = 3;
+    ret = put_attribute(mindset_id, "RANK", &a_out, int_type_id, dspace_scalar_id, &attr_2a_id);
+    if(ret < 0) TEST_ERROR
+
+    count = count_attributes(dset_id);
+    if(count != 2) TEST_ERROR
+    count = count_attributes(mindset_id);
+    if(count != 2) TEST_ERROR
+
+    ret = H5Aread(attr_2_id, int_type_id, &a_out);
+    if(ret < 0) TEST_ERROR
+    if(a_out != 5) TEST_ERROR
+
+    ret = H5Aread(attr_2a_id, int_type_id, &a_out);
+    if(ret < 0) TEST_ERROR
+    if(a_out != 3) TEST_ERROR
+
+    /* -----------------
+     * add third attribute
+     */
+
+    a_out = -86;
+    ret = put_attribute(dset_id, "FLAVOR", &a_out, int_type_id, dspace_scalar_id, &attr_3_id);
+    if(ret < 0) TEST_ERROR
+
+    a_out = 2185;
+    ret = put_attribute(mindset_id, "FLAVOR", &a_out, int_type_id, dspace_scalar_id, &attr_3a_id);
+    if(ret < 0) TEST_ERROR
+
+    count = count_attributes(dset_id);
+    if(count != 3) TEST_ERROR
+    count = count_attributes(mindset_id);
+    if(count != 3) TEST_ERROR
+
+    ret = H5Aread(attr_3_id, int_type_id, &a_out);
+    if(ret < 0) TEST_ERROR
+    if(a_out != -86) TEST_ERROR
+
+    ret = H5Aread(attr_3a_id, int_type_id, &a_out);
+    if(ret < 0) TEST_ERROR
+    if(a_out != 2185) TEST_ERROR
+
+    /************
+     * TEARDOWN *
+     ************/
+
+    if(H5Tclose(int_type_id) < 0) TEST_ERROR
+    if(H5Tclose(char_type_id) < 0) TEST_ERROR
+    if(H5Pclose(dcpl_id) < 0) TEST_ERROR
+    if(H5Sclose(dspace_id) < 0) TEST_ERROR
+    if(H5Dclose(dset_id) < 0) TEST_ERROR
+    if(H5Dclose(mindset_id) < 0) TEST_ERROR
+    if(H5Aclose(attr_1_id) < 0) TEST_ERROR
+    if(H5Aclose(attr_1a_id) < 0) TEST_ERROR
+    if(H5Aclose(attr_2_id) < 0) TEST_ERROR
+    if(H5Aclose(attr_2a_id) < 0) TEST_ERROR
+    if(H5Aclose(attr_3_id) < 0) TEST_ERROR
+    if(H5Aclose(attr_3a_id) < 0) TEST_ERROR
+    if(H5Fclose(file_id) < 0) TEST_ERROR
+
+    PASSED()
+    return SUCCEED;
+
+error :
+    H5E_BEGIN_TRY {
+        (void)H5Tclose(int_type_id);
+        (void)H5Tclose(char_type_id);
+        (void)H5Pclose(dcpl_id);
+        (void)H5Sclose(dspace_id);
+        (void)H5Dclose(dset_id);
+        (void)H5Dclose(mindset_id);
+        (void)H5Aclose(attr_1_id);
+        (void)H5Aclose(attr_1a_id);
+        (void)H5Aclose(attr_2_id);
+        (void)H5Aclose(attr_2a_id);
+        (void)H5Aclose(attr_3_id);
+        (void)H5Aclose(attr_3a_id);
+        (void)H5Fclose(file_id);
+    } H5E_END_TRY;
+    return FAIL;
+} /* test_minimized_dset_ohdr_attribute_addition */
+
+/*
+ * Compare header sizes against when headers have been minimized.
+ * Repeats tests with headers "compact" and normal.
+ */
+static herr_t
+test_minimized_dset_ohdr_size_comparisons(hid_t fapl_id)
+{
+    hsize_t  array_10[1] = {10}; /* dataspace extents */
+    unsigned compact     = 0;
+
+    /* IDs that are file-agnostic */
+    hid_t dspace_id     = -1;
+    hid_t int_type_id   = -1;
+    hid_t dcpl_minimize = -1;
+    hid_t dcpl_dontmin  = -1;
+    hid_t dcpl_default  = -1;
+
+    /* IDs for non-minimized file open */
+    hid_t file_f_id   = -1; /* lower 'f' for standard file setting */
+    hid_t dset_f_x_id = -1; /* 'x' for default */
+    hid_t dset_f_N_id = -1; /* 'N' for explcit non-minimized dset */
+    hid_t dset_f_Y_id = -1; /* 'Y' for minimized dset */
+
+    /* IDs for minimized file open */
+    hid_t file_F_id   = -1; /* upper 'F' for minimized file setting */
+    hid_t dset_F_x_id = -1; /* 'x' for default */
+    hid_t dset_F_N_id = -1; /* 'N' for explcit non-minimized dset */
+    hid_t dset_F_Y_id = -1; /* 'Y' for minimized dset */
+
+    char filename_a[512] = "";
+    char filename_b[512] = "";
+
+    herr_t ret;
+
+    /* dataset suffixes:
+     *                | default | minimize | don't minimize (dcpl-set)
+     * ---------------+---------+----------+---------------
+     * file-default   |   f_x   |   f_Y    |   f_N
+     * ---------------+---------+----------+---------------
+     * file-minimized |   F_x   |   F_Y    |   F_N
+     */
+
+    TESTING("minimized dset object headers size comparisons");
+
+    /*********
+     * SETUP *
+     *********/
+
+    if(h5_fixname(FILENAME[1], fapl_id, filename_a, sizeof(filename_a)) == NULL)
+        TEST_ERROR
+
+    if(h5_fixname(FILENAME[2], fapl_id, filename_b, sizeof(filename_b)) == NULL)
+        TEST_ERROR
+
+    for (compact = 0; compact < 2; compact++) { /* 0 or 1 */
+        dcpl_default = H5Pcreate(H5P_DATASET_CREATE);
+        if(dcpl_default < 0) TEST_ERROR
+ 
+        dcpl_minimize = H5Pcreate(H5P_DATASET_CREATE);
+        if(dcpl_minimize < 0) TEST_ERROR
+        ret = H5Pset_dset_no_attrs_hint(dcpl_minimize, TRUE);
+        if(ret < 0) TEST_ERROR
+
+        dcpl_dontmin = H5Pcreate(H5P_DATASET_CREATE);
+        if(dcpl_dontmin < 0) TEST_ERROR
+        ret = H5Pset_dset_no_attrs_hint(dcpl_dontmin, FALSE);
+        if(ret < 0) TEST_ERROR
+
+        if(compact) {
+            HDprintf("...compact ");
+            ret = H5Pset_layout(dcpl_default, H5D_COMPACT);
+            if(ret < 0) TEST_ERROR
+            ret = H5Pset_layout(dcpl_minimize, H5D_COMPACT);
+            if(ret < 0) TEST_ERROR
+            ret = H5Pset_layout(dcpl_dontmin, H5D_COMPACT);
+            if(ret < 0) TEST_ERROR
+        } else 
+            HDprintf("...not compact ");
+
+        dspace_id = H5Screate_simple(1, array_10, NULL);
+        if(dspace_id < 0) TEST_ERROR
+
+        int_type_id = H5Tcopy(H5T_NATIVE_INT);
+        if(int_type_id < 0) TEST_ERROR
+
+        file_f_id = H5Fcreate(filename_a, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id);
+        if(file_f_id < 0) TEST_ERROR
+
+        dset_f_x_id = H5Dcreate2(file_f_id, "default", int_type_id, dspace_id, H5P_DEFAULT, dcpl_default, H5P_DEFAULT);
+        if(dset_f_x_id < 0) TEST_ERROR
+
+        dset_f_N_id = H5Dcreate2(file_f_id, "dsetNOT", int_type_id, dspace_id, H5P_DEFAULT, dcpl_dontmin, H5P_DEFAULT);
+        if(dset_f_N_id < 0) TEST_ERROR
+
+        dset_f_Y_id = H5Dcreate2(file_f_id, "dsetMIN", int_type_id, dspace_id, H5P_DEFAULT, dcpl_minimize, H5P_DEFAULT);
+        if(dset_f_x_id < 0) TEST_ERROR
+
+        file_F_id = H5Fcreate(filename_b, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id);
+        if(file_F_id < 0) TEST_ERROR
+        ret = H5Fset_dset_no_attrs_hint(file_F_id, TRUE);
+        if(ret < 0) TEST_ERROR
+
+        dset_F_x_id = H5Dcreate2(file_F_id, "default", int_type_id, dspace_id, H5P_DEFAULT, dcpl_default, H5P_DEFAULT);
+        if(dset_F_x_id < 0) TEST_ERROR
+
+        dset_F_N_id = H5Dcreate2(file_F_id, "dsetNOT", int_type_id, dspace_id, H5P_DEFAULT, dcpl_dontmin, H5P_DEFAULT);
+        if(dset_F_N_id < 0) TEST_ERROR
+
+        dset_F_Y_id = H5Dcreate2(file_F_id, "dsetMIN", int_type_id, dspace_id, H5P_DEFAULT, dcpl_minimize, H5P_DEFAULT);
+        if(dset_F_Y_id < 0) TEST_ERROR
+
+        /*********
+         * TESTS *
+         *********/
+
+        if(oh_compare(dset_f_x_id, dset_f_x_id) != EQ) TEST_ERROR /* identity */
+
+        if(oh_compare(dset_f_x_id, dset_f_N_id) != EQ) TEST_ERROR
+        if(oh_compare(dset_f_x_id, dset_f_Y_id) != GT) TEST_ERROR
+        if(oh_compare(dset_f_N_id, dset_f_Y_id) != GT) TEST_ERROR
+
+        if(oh_compare(dset_F_x_id, dset_F_N_id) != EQ) TEST_ERROR
+        if(oh_compare(dset_F_x_id, dset_F_Y_id) != EQ) TEST_ERROR
+        if(oh_compare(dset_F_N_id, dset_F_Y_id) != EQ) TEST_ERROR
+
+        if(oh_compare(dset_F_x_id, dset_f_Y_id) != EQ) TEST_ERROR
+        if(oh_compare(dset_F_x_id, dset_f_x_id) != LT) TEST_ERROR
+
+        /************
+         * TEARDOWN *
+         ************/
+
+        if(H5Sclose(dspace_id) < 0) TEST_ERROR
+        if(H5Tclose(int_type_id) < 0) TEST_ERROR
+        if(H5Pclose(dcpl_default) < 0) TEST_ERROR
+        if(H5Pclose(dcpl_minimize) < 0) TEST_ERROR
+        if(H5Pclose(dcpl_dontmin) < 0) TEST_ERROR
+
+        if(H5Fclose(file_f_id) < 0) TEST_ERROR
+        if(H5Dclose(dset_f_x_id) < 0) TEST_ERROR
+        if(H5Dclose(dset_f_N_id) < 0) TEST_ERROR
+        if(H5Dclose(dset_f_Y_id) < 0) TEST_ERROR
+
+        if(H5Fclose(file_F_id) < 0) TEST_ERROR
+        if(H5Dclose(dset_F_x_id) < 0) TEST_ERROR
+        if(H5Dclose(dset_F_N_id) < 0) TEST_ERROR
+        if(H5Dclose(dset_F_Y_id) < 0) TEST_ERROR
+
+    } /* compact and non-compact */
+
+    PASSED()
+    return SUCCEED;
+
+error :
+    H5E_BEGIN_TRY {
+        (void)H5Pclose(dcpl_default);
+        (void)H5Pclose(dcpl_minimize);
+        (void)H5Pclose(dcpl_dontmin);
+        (void)H5Sclose(dspace_id);
+        (void)H5Tclose(int_type_id);
+
+        (void)H5Fclose(file_f_id);
+        (void)H5Dclose(dset_f_x_id);
+        (void)H5Dclose(dset_f_N_id);
+        (void)H5Dclose(dset_f_Y_id);
+
+        (void)H5Fclose(file_F_id);
+        (void)H5Dclose(dset_F_x_id);
+        (void)H5Dclose(dset_F_N_id);
+        (void)H5Dclose(dset_F_Y_id);
+    } H5E_END_TRY;
+    return FAIL;
+} /* test_minimized_dset_ohdr_size_comparisons */
+
+/*
+ * Test minimized dataset object header with filter/pipeline message
+ */
+static herr_t
+test_minimized_dset_ohdr_with_filter(hid_t fapl_id)
+{
+    char           filename[512]   = "";
+    const hsize_t  extents[1]      = {1024}; /* extents of dataspace */
+    const unsigned filter_values[] = {0};  /* TBD */
+    const hsize_t  chunk_dim[]     = {32};  /* needed for filter */
+    const int      ndims           = 1;
+    hid_t          dspace_id       = -1;
+    hid_t          dtype_id        = -1;
+    hid_t          dcpl_xZ_id      = -1;
+    hid_t          dcpl_mx_id      = -1;
+    hid_t          dcpl_mZ_id      = -1;
+    hid_t          dset_xx_id      = -1;
+    hid_t          dset_xZ_id      = -1;
+    hid_t          dset_mx_id      = -1;
+    hid_t          dset_mZ_id      = -1;
+    hid_t          file_id         = -1;
+    herr_t         ret;
+
+    /* dcpl suffixes:
+     *           | default | minimize
+     * ----------+---------+---------
+     * no filter |    xx   |   mx
+     * ----------+---------+---------
+     * filter    |    xZ   |   mZ
+     */
+
+    TESTING("minimized dset object headers with filter message");
+
+    /*********
+     * SETUP *
+     *********/
+
+    if(h5_fixname(FILENAME[1], fapl_id, filename, sizeof(filename)) == NULL)
+        TEST_ERROR
+
+    dcpl_mx_id = H5Pcreate(H5P_DATASET_CREATE);
+    if(dcpl_mx_id < 0) TEST_ERROR
+    ret = H5Pset_dset_no_attrs_hint(dcpl_mx_id, TRUE);
+    if(ret < 0) TEST_ERROR
+
+    dcpl_xZ_id = H5Pcreate(H5P_DATASET_CREATE);
+    if(dcpl_xZ_id < 0) TEST_ERROR
+    ret = H5Pset_chunk(dcpl_xZ_id, ndims, chunk_dim);
+    if(ret < 0) TEST_ERROR
+    ret = H5Pset_filter(dcpl_xZ_id, H5Z_FILTER_DEFLATE, H5Z_FLAG_OPTIONAL, 0, filter_values);
+    if(ret < 0) TEST_ERROR
+    dcpl_mZ_id = H5Pcreate(H5P_DATASET_CREATE);
+    if(dcpl_mZ_id < 0) TEST_ERROR
+    ret = H5Pset_dset_no_attrs_hint(dcpl_mZ_id, TRUE);
+    if(ret < 0) TEST_ERROR
+    ret = H5Pset_chunk(dcpl_mZ_id, ndims, chunk_dim);
+    if(ret < 0) TEST_ERROR
+    ret = H5Pset_filter( dcpl_mZ_id, H5Z_FILTER_DEFLATE, H5Z_FLAG_OPTIONAL, 0, filter_values);
+    if(ret < 0) TEST_ERROR
+
+    dspace_id = H5Screate_simple(1, extents, extents);
+    if(dspace_id < 0) TEST_ERROR
+
+    dtype_id = H5Tcopy(H5T_NATIVE_INT);
+    if(dtype_id < 0) TEST_ERROR
+
+    file_id = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id);
+    if(file_id < 0) TEST_ERROR
+
+    dset_xx_id = H5Dcreate2(file_id, "xx", dtype_id, dspace_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    if(dset_xx_id < 0) TEST_ERROR
+
+    dset_mx_id = H5Dcreate2(file_id, "Mx", dtype_id, dspace_id, H5P_DEFAULT, dcpl_mx_id, H5P_DEFAULT);
+    if(dset_mx_id < 0) TEST_ERROR
+
+    dset_xZ_id = H5Dcreate2(file_id, "xZ", dtype_id, dspace_id, H5P_DEFAULT, dcpl_xZ_id, H5P_DEFAULT);
+    if(dset_xZ_id < 0) TEST_ERROR
+
+    dset_mZ_id = H5Dcreate2(file_id, "MZ", dtype_id, dspace_id, H5P_DEFAULT, dcpl_mZ_id, H5P_DEFAULT);
+    if(dset_mZ_id < 0) TEST_ERROR
+
+    /*********
+     * TESTS *
+     *********/
+
+    if(oh_compare(dset_mx_id, dset_xx_id) != LT) TEST_ERROR
+    if(oh_compare(dset_mx_id, dset_xZ_id) != LT) TEST_ERROR
+    if(oh_compare(dset_mZ_id, dset_mx_id) != GT) TEST_ERROR
+    if(oh_compare(dset_mZ_id, dset_xZ_id) != LT) TEST_ERROR
+
+    /************
+     * TEARDOWN *
+     ************/
+
+    if(H5Sclose(dspace_id) < 0) TEST_ERROR
+    if(H5Tclose(dtype_id) < 0) TEST_ERROR
+    if(H5Pclose(dcpl_xZ_id) < 0) TEST_ERROR
+    if(H5Pclose(dcpl_mx_id) < 0) TEST_ERROR
+    if(H5Pclose(dcpl_mZ_id) < 0) TEST_ERROR
+    if(H5Dclose(dset_xx_id) < 0) TEST_ERROR
+    if(H5Dclose(dset_xZ_id) < 0) TEST_ERROR
+    if(H5Dclose(dset_mx_id) < 0) TEST_ERROR
+    if(H5Dclose(dset_mZ_id) < 0) TEST_ERROR
+    if(H5Fclose(file_id) < 0) TEST_ERROR
+
+    PASSED()
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY {
+        (void)H5Sclose(dspace_id);
+        (void)H5Tclose(dtype_id);
+        (void)H5Pclose(dcpl_xZ_id);
+        (void)H5Pclose(dcpl_mx_id);
+        (void)H5Pclose(dcpl_mZ_id);
+        (void)H5Dclose(dset_xx_id);
+        (void)H5Dclose(dset_xZ_id);
+        (void)H5Dclose(dset_mx_id);
+        (void)H5Dclose(dset_mZ_id);
+        (void)H5Fclose(file_id);
+    } H5E_END_TRY;
+    return FAIL;
+} /* test_minimized_dset_ohdr_with_filter */
+
+/*
+ * Test minimized dataset object header and recording modification times.
+ */
+static herr_t
+test_minimized_dset_ohdr_modification_times(hid_t _fapl_id)
+{
+    /* test-local structure for parameterized testing
+     */
+    struct testcase {
+        unsigned oh_version;
+    };
+
+    char          filename[512] = "";
+    const hsize_t extents[1]    = {128}; /* extents of dataspace */
+    hid_t         dspace_id     = -1;
+    hid_t         dtype_id      = -1;
+    hid_t         dcpl_xT_id    = -1; /* Track modtime */
+    hid_t         dcpl_mx_id    = -1; /* minimized */
+    hid_t         dcpl_mT_id    = -1; /* minimized, Track */
+    hid_t         dcpl_mN_id    = -1; /* minimized, do Not track */
+    hid_t         dset_xx_id    = -1;
+    hid_t         dset_xT_id    = -1;
+    hid_t         dset_mx_id    = -1;
+    hid_t         dset_mT_id    = -1;
+    hid_t         dset_mN_id    = -1;
+    hid_t         file_id       = -1;
+    hid_t         fapl_id       = -1;
+    herr_t        ret;
+
+    unsigned i       = 0; /* for testcase loop */
+    unsigned n_cases = 2; /* must match `cases` array size below */
+    struct testcase cases[2] = {
+        { 1, }, /* version 1 object header */
+        { 2, }, /* version 2 object header */
+    };
+
+    /* dcpl suffixes:
+     *             | default | minimize
+     * ------------+---------+---------
+     * default     |    xx   |   mx
+     * ------------+---------+---------
+     * don't track |    xN   |   mN
+     * ------------+---------+---------
+     * track       |    xT   |   mT
+     */
+
+    TESTING("minimized dset object headers with modification times");
+
+    /*********
+     * SETUP *
+     *********/
+
+    if(h5_fixname(FILENAME[1], _fapl_id, filename, sizeof(filename)) == NULL)
+        TEST_ERROR
+
+    dcpl_mx_id = H5Pcreate(H5P_DATASET_CREATE);
+    if(dcpl_mx_id < 0) TEST_ERROR
+    ret = H5Pset_dset_no_attrs_hint(dcpl_mx_id, TRUE);
+    if(ret < 0) TEST_ERROR
+
+    dcpl_xT_id = H5Pcreate(H5P_DATASET_CREATE);
+    if(dcpl_xT_id < 0) TEST_ERROR
+    ret = H5Pset_obj_track_times(dcpl_xT_id, TRUE);
+    if(ret < 0) TEST_ERROR
+
+    dcpl_mT_id = H5Pcreate(H5P_DATASET_CREATE);
+    if(dcpl_mT_id < 0) TEST_ERROR
+    ret = H5Pset_dset_no_attrs_hint(dcpl_mT_id, TRUE);
+    if(ret < 0) TEST_ERROR
+    ret = H5Pset_obj_track_times(dcpl_mT_id, TRUE);
+    if(ret < 0) TEST_ERROR
+
+    dcpl_mN_id = H5Pcreate(H5P_DATASET_CREATE);
+    if(dcpl_mN_id < 0) TEST_ERROR
+    ret = H5Pset_dset_no_attrs_hint(dcpl_mN_id, TRUE);
+    if(ret < 0) TEST_ERROR
+    ret = H5Pset_obj_track_times(dcpl_mN_id, FALSE);
+    if(ret < 0) TEST_ERROR
+
+    dspace_id = H5Screate_simple(1, extents, extents);
+    if(dspace_id < 0) TEST_ERROR
+
+    dtype_id = H5Tcopy(H5T_NATIVE_INT);
+    if(dtype_id < 0) TEST_ERROR
+
+    for (i = 0; i < n_cases; i++) {
+
+        /* -------------- *
+         * per-case setup *
+         * -------------- */
+
+        fapl_id = H5Pcopy(_fapl_id);
+        if(fapl_id < 0) TEST_ERROR
+
+        if(cases[i].oh_version > 1) {
+            ret = H5Pset_libver_bounds(fapl_id, H5F_LIBVER_V18, H5F_LIBVER_V110);
+            if(ret < 0) TEST_ERROR
+        }
+
+        file_id = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id);
+        if(file_id < 0) TEST_ERROR
+
+        dset_xx_id = H5Dcreate2( file_id, "xx", dtype_id, dspace_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+        if(dset_xx_id < 0) TEST_ERROR
+
+        dset_mx_id = H5Dcreate2(file_id, "mx", dtype_id, dspace_id, H5P_DEFAULT, dcpl_mx_id, H5P_DEFAULT);
+        if(dset_mx_id < 0) TEST_ERROR
+
+        dset_xT_id = H5Dcreate2(file_id, "xT", dtype_id, dspace_id, H5P_DEFAULT, dcpl_xT_id, H5P_DEFAULT);
+        if(dset_xT_id < 0) TEST_ERROR
+        dset_mT_id = H5Dcreate2(file_id, "mT", dtype_id, dspace_id, H5P_DEFAULT, dcpl_mT_id, H5P_DEFAULT);
+        if(dset_mT_id < 0) TEST_ERROR
+
+        dset_mN_id = H5Dcreate2(file_id, "mN", dtype_id, dspace_id, H5P_DEFAULT, dcpl_mN_id, H5P_DEFAULT);
+        if(dset_mN_id < 0) TEST_ERROR
+
+        /* ----- *
+         * TESTS *
+         * ----- */
+
+        /* sanity check */
+        if(oh_compare(dset_mx_id, dset_xx_id) != LT) TEST_ERROR
+        if(oh_compare(dset_mx_id, dset_xT_id) != LT) TEST_ERROR
+
+        if(oh_compare(dset_xx_id, dset_xT_id) != EQ) TEST_ERROR
+        if(oh_compare(dset_mx_id, dset_mT_id) != EQ) TEST_ERROR
+        if(oh_compare(dset_mN_id, dset_mT_id) != LT) TEST_ERROR
+
+        if(oh_compare(dset_mT_id, dset_xT_id) != LT) TEST_ERROR
+
+        /* ----------------- *
+         * per-case teardown *
+         * ----------------- */
+
+        if(H5Dclose(dset_xx_id) < 0) TEST_ERROR
+        if(H5Dclose(dset_xT_id) < 0) TEST_ERROR
+        if(H5Dclose(dset_mx_id) < 0) TEST_ERROR
+        if(H5Dclose(dset_mT_id) < 0) TEST_ERROR
+        if(H5Dclose(dset_mN_id) < 0) TEST_ERROR
+        if(H5Fclose(file_id) < 0) TEST_ERROR
+        if(H5Pclose(fapl_id) < 0) TEST_ERROR
+
+    } /* for each version tested */
+
+    /************
+     * TEARDOWN *
+     ************/
+
+    if(H5Sclose(dspace_id) < 0) TEST_ERROR
+    if(H5Tclose(dtype_id) < 0) TEST_ERROR
+    if(H5Pclose(dcpl_xT_id) < 0) TEST_ERROR
+    if(H5Pclose(dcpl_mx_id) < 0) TEST_ERROR
+    if(H5Pclose(dcpl_mT_id) < 0) TEST_ERROR
+    if(H5Pclose(dcpl_mN_id) < 0) TEST_ERROR
+
+    PASSED()
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY {
+        (void)H5Sclose(dspace_id);
+        (void)H5Tclose(dtype_id);
+        (void)H5Pclose(dcpl_xT_id);
+        (void)H5Pclose(dcpl_mx_id);
+        (void)H5Pclose(dcpl_mT_id);
+        (void)H5Pclose(dcpl_mN_id);
+        (void)H5Dclose(dset_xx_id);
+        (void)H5Dclose(dset_xT_id);
+        (void)H5Dclose(dset_mx_id);
+        (void)H5Dclose(dset_mT_id);
+        (void)H5Dclose(dset_mN_id);
+        (void)H5Fclose(file_id);
+        (void)H5Pclose(fapl_id);
+    } H5E_END_TRY;
+    return FAIL;
+} /* test_minimized_dset_ohdr_modification_times */
+
+/*
+ * Test minimized dataset object header with a fill value set.
+ */
+static herr_t
+test_minimized_dset_ohdr_fillvalue_backwards_compatability(hid_t _fapl_id)
+{
+    char          filename[512] = "";
+    const hsize_t extents[1]    = {64}; /* extents of dataspace */
+    const int     fill[1]       = {343}; /* fill value of dataset */
+    hid_t         file_id       = -1;
+    hid_t         dtype_id      = -1;
+    hid_t         dspace_id     = -1;
+    hid_t         dcpl_id       = -1;
+    hid_t         fapl_id       = -1;
+    hid_t         dset_0_id     = -1;
+    hid_t         dset_1_id     = -1;
+    herr_t        ret;
+
+    /*********
+     * SETUP *
+     *********/
+
+    TESTING("minimized dset object headers with fill values and different libver support");
+
+    fapl_id = H5Pcopy(_fapl_id);
+    if(fapl_id < 0) TEST_ERROR
+
+    if(h5_fixname(FILENAME[1], fapl_id, filename, sizeof(filename)) == NULL)
+        TEST_ERROR
+
+    dspace_id = H5Screate_simple(1, extents, extents);
+    if(dspace_id < 0) TEST_ERROR
+
+    dtype_id = H5Tcopy(H5T_NATIVE_INT);
+    if(dtype_id < 0) TEST_ERROR
+
+    dcpl_id = H5Pcreate(H5P_DATASET_CREATE);
+    if(dcpl_id < 0) TEST_ERROR
+
+    ret = H5Pset_dset_no_attrs_hint(dcpl_id, TRUE);
+    if(ret == FAIL) TEST_ERROR;
+
+    ret = H5Pset_fill_value(dcpl_id, dtype_id, fill);
+    if(ret == FAIL) TEST_ERROR;
+
+    ret = H5Pset_libver_bounds(fapl_id, H5F_LIBVER_EARLIEST, H5F_LIBVER_LATEST);
+    if(ret == FAIL) TEST_ERROR;
+
+    file_id = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id);
+    if(file_id < 0) TEST_ERROR
+
+    dset_0_id = H5Dcreate2(file_id, "fullrange", dtype_id, dspace_id, H5P_DEFAULT, dcpl_id, H5P_DEFAULT);
+    if(dset_0_id < 0) TEST_ERROR
+
+    /* Close file and re-open with different libver bounds.
+     * Dataset "fullrange" must also be closed for expected reopen behavior.
+     */
+    if(H5Fclose(file_id) < 0) TEST_ERROR;
+    if(H5Dclose(dset_0_id) < 0) TEST_ERROR
+
+    ret = H5Pset_libver_bounds(fapl_id, H5F_LIBVER_V18, H5F_LIBVER_LATEST);
+    if(ret == FAIL) TEST_ERROR;
+
+    file_id = H5Fopen(filename, H5F_ACC_RDWR, fapl_id);
+    if(file_id < 0) TEST_ERROR
+
+    dset_1_id = H5Dcreate2(file_id, "upperrange", dtype_id, dspace_id, H5P_DEFAULT, dcpl_id, H5P_DEFAULT);
+    if(dset_1_id < 0) TEST_ERROR
+
+    /* re-open "fullrange" dataset
+     */
+     dset_0_id = H5Dopen2(file_id, "fullrange", H5P_DEFAULT);
+     if(dset_0_id < 0) TEST_ERROR
+
+    /*********
+     * TESTS *
+     *********/
+
+    /* dset not supporting pre-1.08 should be smaller? */
+    if(oh_compare(dset_1_id, dset_0_id) != LT) TEST_ERROR
+
+    /************
+     * TEARDOWN *
+     ************/
+
+    if(H5Sclose(dspace_id) < 0) TEST_ERROR
+    if(H5Tclose(dtype_id) < 0) TEST_ERROR
+    if(H5Pclose(dcpl_id) < 0) TEST_ERROR
+    if(H5Pclose(fapl_id) < 0) TEST_ERROR
+    if(H5Dclose(dset_0_id) < 0) TEST_ERROR
+    if(H5Dclose(dset_1_id) < 0) TEST_ERROR
+    if(H5Fclose(file_id) < 0) TEST_ERROR;
+
+    PASSED()
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY {
+        (void)H5Sclose(dspace_id);
+        (void)H5Tclose(dtype_id);
+        (void)H5Pclose(dcpl_id);
+        (void)H5Pclose(fapl_id);
+        (void)H5Dclose(dset_0_id);
+        (void)H5Dclose(dset_1_id);
+        (void)H5Fclose(file_id);
+    } H5E_END_TRY;
+    return FAIL;
+} /* test_minimized_dset_ohdr_fillvalue_backwards_compatability */
+
 #define STR_EARLIEST "earliest"
 #define STR_V18 "v18"
 #define STR_LATEST "latest"
@@ -792,6 +1686,8 @@ main(void)
     hid_t fapl = -1;
     hid_t file = -1;
     H5F_t *f = NULL;
+    const char  *env_h5_drvr;   /* File driver value from environment */
+    hbool_t single_file_vfd;    /* Whether VFD used stores data in a single file */
     char  filename[1024];
     H5O_hdr_info_t hdr_info;  /* Object info */
     H5O_loc_t      oh_loc;    /* Object header locations */
@@ -802,6 +1698,14 @@ main(void)
     hbool_t     api_ctx_pushed = FALSE;             /* Whether API context pushed */
     herr_t ret;               /* Generic return value */
 
+    /* Get the VFD to use */
+    env_h5_drvr = HDgetenv("HDF5_DRIVER");
+    if(env_h5_drvr == NULL)
+        env_h5_drvr = "nomatch";
+
+    /* Check for VFD which stores data in multiple files */
+    single_file_vfd = (hbool_t)(HDstrcmp(env_h5_drvr, "split") && HDstrcmp(env_h5_drvr, "multi") && HDstrcmp(env_h5_drvr, "family"));
+
     /* Reset library */
     h5_reset();
     fapl = h5_fileaccess();
@@ -1020,16 +1924,43 @@ main(void)
          * and the various "fail/mark if unknown" object header message flags
          */
         HDputs("Accessing objects with unknown header messages: H5O_BOGUS_VALID_ID");
-        if(test_unknown(H5O_BOGUS_VALID_ID, filename, fapl) < 0)
-            TEST_ERROR
+        if(single_file_vfd) {
+            if(test_unknown(H5O_BOGUS_VALID_ID, filename, fapl) < 0)
+                TEST_ERROR
+        } /* end if */
+        else {
+            SKIPPED();
+            HDputs("    Unknown header message test not supported with the current VFD.");
+        } /* end else */
         HDputs("Accessing objects with unknown header messages: H5O_BOGUS_INVALID_ID");
-        if(test_unknown(H5O_BOGUS_INVALID_ID, filename, fapl) < 0)
-            TEST_ERROR
+        if(single_file_vfd) {
+            if(test_unknown(H5O_BOGUS_INVALID_ID, filename, fapl) < 0)
+                TEST_ERROR
+        } /* end if */
+        else {
+            SKIPPED();
+            HDputs("    Unknown header message test not supported with the current VFD.");
+        } /* end else */
 
         /* Test object header creation metadata cache issues */
         if(test_ohdr_cache(filename, fapl) < 0)
             TEST_ERROR
 
+        if(test_minimized_dset_ohdr_attribute_addition(fapl) < 0)
+            TEST_ERROR
+
+        if(test_minimized_dset_ohdr_size_comparisons(fapl) < 0)
+            TEST_ERROR
+
+        if(test_minimized_dset_ohdr_with_filter(fapl) < 0)
+            TEST_ERROR
+
+        if(test_minimized_dset_ohdr_modification_times(fapl) < 0)
+            TEST_ERROR
+
+        if(test_minimized_dset_ohdr_fillvalue_backwards_compatability(fapl) < 0)
+            TEST_ERROR
+
       } /* high */
     } /* low */
 
diff --git a/test/tattr.c b/test/tattr.c
index 3a7cf2c..454ea71 100644
--- a/test/tattr.c
+++ b/test/tattr.c
@@ -143,6 +143,16 @@ float attr_data5=-5.123F;        /* Test data for 5th attribute */
 #define DIM1 100
 #define RANK 2
 
+/* Used by test_attr_info_null_info_pointer() */
+#define GET_INFO_NULL_POINTER_ATTR_NAME "NullInfoPointerAttr"
+
+/* Used by test_attr_rename_invalid_name() */
+#define INVALID_RENAME_TEST_ATTR_NAME "InvalidRenameTestAttr"
+#define INVALID_RENAME_TEST_NEW_ATTR_NAME "InvalidRenameTestNewAttr"
+
+/* Used by test_attr_get_name_invalid_buf() */
+#define GET_NAME_INVALID_BUF_TEST_ATTR_NAME "InvalidNameBufferTestAttr"
+
 /* Attribute iteration struct */
 typedef struct {
     H5_iter_order_t order;      /* Direction of iteration */
@@ -157,6 +167,12 @@ typedef struct {
 static herr_t attr_op1(hid_t loc_id, const char *name, const H5A_info_t *ainfo,
     void *op_data);
 
+/* Global dcpl ID, can be re-set as a generated dcpl for various operations
+ * across multiple tests.
+ * e.g., minimized dataset object headers
+ */
+static hid_t dcpl_g = H5P_DEFAULT;
+
 
 
 /****************************************************************
@@ -196,7 +212,7 @@ test_attr_basic_write(hid_t fapl)
     CHECK(sid1, FAIL, "H5Screate_simple");
 
     /* Create a dataset */
-    dataset = H5Dcreate2(fid1, DSET1_NAME, H5T_NATIVE_UCHAR, sid1, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    dataset = H5Dcreate2(fid1, DSET1_NAME, H5T_NATIVE_UCHAR, sid1, H5P_DEFAULT, dcpl_g, H5P_DEFAULT);
     CHECK(dataset, FAIL, "H5Dcreate2");
 
     /* Create dataspace for attribute */
@@ -516,7 +532,7 @@ test_attr_flush(hid_t fapl)
     spc = H5Screate(H5S_SCALAR);
     CHECK(spc, FAIL, "H5Screate");
 
-    set = H5Dcreate2(fil, DSET1_NAME, H5T_NATIVE_DOUBLE, spc, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    set = H5Dcreate2(fil, DSET1_NAME, H5T_NATIVE_DOUBLE, spc, H5P_DEFAULT, dcpl_g, H5P_DEFAULT);
     CHECK(set, FAIL, "H5Dcreate2");
 
     att = H5Acreate2(set, ATTR1_NAME, H5T_NATIVE_DOUBLE, spc, H5P_DEFAULT, H5P_DEFAULT);
@@ -587,7 +603,7 @@ test_attr_plist(hid_t fapl)
     CHECK(sid1, FAIL, "H5Screate_simple");
 
     /* Create a dataset */
-    dataset = H5Dcreate2(fid1, DSET1_NAME, H5T_NATIVE_UCHAR, sid1, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    dataset = H5Dcreate2(fid1, DSET1_NAME, H5T_NATIVE_UCHAR, sid1, H5P_DEFAULT, dcpl_g, H5P_DEFAULT);
     CHECK(dataset, FAIL, "H5Dcreate2");
 
     /* Create dataspace for attribute */
@@ -701,7 +717,7 @@ test_attr_compound_write(hid_t fapl)
     CHECK(sid1, FAIL, "H5Screate_simple");
 
     /* Create a dataset */
-    dataset = H5Dcreate2(fid1, DSET1_NAME, H5T_NATIVE_UCHAR, sid1, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    dataset = H5Dcreate2(fid1, DSET1_NAME, H5T_NATIVE_UCHAR, sid1, H5P_DEFAULT, dcpl_g, H5P_DEFAULT);
     CHECK(dataset, FAIL, "H5Dcreate2");
 
     /* Close dataset's dataspace */
@@ -937,7 +953,7 @@ test_attr_scalar_write(hid_t fapl)
     CHECK(sid1, FAIL, "H5Screate_simple");
 
     /* Create a dataset */
-    dataset = H5Dcreate2(fid1, DSET1_NAME, H5T_NATIVE_UCHAR, sid1, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    dataset = H5Dcreate2(fid1, DSET1_NAME, H5T_NATIVE_UCHAR, sid1, H5P_DEFAULT, dcpl_g, H5P_DEFAULT);
     CHECK(dataset, FAIL, "H5Dcreate2");
 
     /* Create dataspace for attribute */
@@ -1078,7 +1094,7 @@ test_attr_mult_write(hid_t fapl)
     CHECK(sid1, FAIL, "H5Screate_simple");
 
     /* Create a dataset */
-    dataset = H5Dcreate2(fid1, DSET1_NAME, H5T_NATIVE_UCHAR, sid1, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    dataset = H5Dcreate2(fid1, DSET1_NAME, H5T_NATIVE_UCHAR, sid1, H5P_DEFAULT, dcpl_g, H5P_DEFAULT);
     CHECK(dataset, FAIL, "H5Dcreate2");
 
     /* Close dataset's dataspace */
@@ -1456,7 +1472,7 @@ test_attr_iterate(hid_t fapl)
     CHECK(sid, FAIL, "H5Screate");
 
     /* Create a new dataset */
-    dataset = H5Dcreate2(file, DSET2_NAME, H5T_NATIVE_INT, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    dataset = H5Dcreate2(file, DSET2_NAME, H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl_g, H5P_DEFAULT);
     CHECK(dataset, FAIL, "H5Dcreate2");
 
     /* Close dataspace */
@@ -1680,7 +1696,7 @@ test_attr_dtype_shared(hid_t fapl)
     CHECK(space_id, FAIL, "H5Screate");
 
     /* Create dataset */
-    dset_id = H5Dcreate2(file_id, DSET1_NAME, type_id, space_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    dset_id = H5Dcreate2(file_id, DSET1_NAME, type_id, space_id, H5P_DEFAULT, dcpl_g, H5P_DEFAULT);
     CHECK(dset_id, FAIL, "H5Dcreate2");
 
     /* Check reference count on named datatype */
@@ -1834,7 +1850,7 @@ test_attr_duplicate_ids(hid_t fapl)
 
     /* Create a dataset */
     dataset = H5Dcreate2(fid1, DSET1_NAME, H5T_NATIVE_UCHAR, sid1, H5P_DEFAULT,
-            H5P_DEFAULT, H5P_DEFAULT);
+            dcpl_g, H5P_DEFAULT);
     CHECK(dataset, FAIL, "H5Dcreate2");
 
     /* Create dataspace for attribute */
@@ -2159,9 +2175,14 @@ test_attr_dense_create(hid_t fcpl, hid_t fapl)
     sid = H5Screate(H5S_SCALAR);
     CHECK(sid, FAIL, "H5Screate");
 
-    /* Query the group creation properties */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    /* need DCPL to query the group creation properties */
+    if (dcpl_g == H5P_DEFAULT) {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    } else {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    }
 
     /* Create a dataset */
     dataset = H5Dcreate2(fid, DSET1_NAME, H5T_NATIVE_UCHAR, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT);
@@ -2290,9 +2311,14 @@ test_attr_dense_open(hid_t fcpl, hid_t fapl)
     sid = H5Screate(H5S_SCALAR);
     CHECK(sid, FAIL, "H5Screate");
 
-    /* Query the group creation properties */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    /* need DCPL to query the group creation properties */
+    if (dcpl_g == H5P_DEFAULT) {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    } else {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    }
 
     /* Enable creation order tracking on attributes, so creation order tests work */
     ret = H5Pset_attr_creation_order(dcpl, H5P_CRT_ORDER_TRACKED);
@@ -2404,14 +2430,25 @@ test_attr_dense_delete(hid_t fcpl, hid_t fapl)
     h5_stat_size_t empty_filesize;       /* Size of empty file */
     h5_stat_size_t filesize;             /* Size of file after modifications */
     H5O_info_t  oinfo;          /* Object info                  */
+    int         use_min_dset_oh = (dcpl_g != H5P_DEFAULT);
     herr_t      ret;            /* Generic return value        */
 
     /* Output message about test being performed */
     MESSAGE(5, ("Testing Deleting Attributes in Dense Storage\n"));
 
-    /* Create file */
+    if (use_min_dset_oh) { /* using minimized dataset headers */
+        /* modify fcpl...
+         * sidestep "bug" where file space is lost with minimized dset ohdrs
+         */
+        fcpl = H5Pcopy(fcpl);
+        CHECK(fcpl, FAIL, "H5Pcopy");
+        ret = H5Pset_file_space_strategy(fcpl, H5F_FSPACE_STRATEGY_FSM_AGGR, TRUE, 1);
+        CHECK(ret, FAIL, "H5Pset_file_space_strategy");
+    }
     fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl, fapl);
     CHECK(fid, FAIL, "H5Fcreate");
+    if (use_min_dset_oh)
+        CHECK(H5Pclose(fcpl), FAIL, "H5Pclose");
 
     /* Close file */
     ret = H5Fclose(fid);
@@ -2430,9 +2467,14 @@ test_attr_dense_delete(hid_t fcpl, hid_t fapl)
     sid = H5Screate(H5S_SCALAR);
     CHECK(sid, FAIL, "H5Screate");
 
-    /* Query the group creation properties */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    /* need DCPL to query the group creation properties */
+    if (use_min_dset_oh) {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    } else {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    }
 
     /* Enable creation order tracking on attributes, so creation order tests work */
     ret = H5Pset_attr_creation_order(dcpl, H5P_CRT_ORDER_TRACKED);
@@ -2583,14 +2625,25 @@ test_attr_dense_rename(hid_t fcpl, hid_t fapl)
     h5_stat_size_t filesize;             /* Size of file after modifications */
     H5O_info_t  oinfo;          /* Object info */
     unsigned    u;              /* Local index variable */
+    int         use_min_dset_oh = (dcpl_g != H5P_DEFAULT);
     herr_t      ret;            /* Generic return value        */
 
     /* Output message about test being performed */
     MESSAGE(5, ("Testing Renaming Attributes in Dense Storage\n"));
 
-    /* Create file */
+    if (use_min_dset_oh) { /* using minimized dataset headers */
+        /* modify fcpl...
+         * sidestep "bug" where file space is lost with minimized dset ohdrs
+         */
+        fcpl = H5Pcopy(fcpl);
+        CHECK(fcpl, FAIL, "H5Pcopy");
+        ret = H5Pset_file_space_strategy(fcpl, H5F_FSPACE_STRATEGY_FSM_AGGR, TRUE, 1);
+        CHECK(ret, FAIL, "H5Pset_file_space_strategy");
+    }
     fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl, fapl);
     CHECK(fid, FAIL, "H5Fcreate");
+    if (use_min_dset_oh)
+        CHECK(H5Pclose(fcpl), FAIL, "H5Pclose");
 
     /* Close file */
     ret = H5Fclose(fid);
@@ -2609,9 +2662,14 @@ test_attr_dense_rename(hid_t fcpl, hid_t fapl)
     sid = H5Screate(H5S_SCALAR);
     CHECK(sid, FAIL, "H5Screate");
 
-    /* Query the group creation properties */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    /* need DCPL to query the group creation properties */
+    if (use_min_dset_oh) {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    } else {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    }
 
     /* Create a dataset */
     dataset = H5Dcreate2(fid, DSET1_NAME, H5T_NATIVE_UCHAR, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT);
@@ -2742,20 +2800,29 @@ test_attr_dense_unlink(hid_t fcpl, hid_t fapl)
     h5_stat_size_t filesize;             /* Size of file after modifications */
     H5O_info_t  oinfo;          /* Object info */
     unsigned    u;              /* Local index variable */
+    int         use_min_dset_oh = (dcpl_g != H5P_DEFAULT);
     herr_t      ret;            /* Generic return value        */
 
     /* Output message about test being performed */
     MESSAGE(5, ("Testing Unlinking Object with Attributes in Dense Storage\n"));
 
-    /* Create file */
+    if (use_min_dset_oh) { /* using minimized dataset headers */
+        /* modify fcpl...
+         * sidestep "bug" where file space is lost with minimized dset ohdrs
+         */
+        fcpl = H5Pcopy(fcpl);
+        CHECK(fcpl, FAIL, "H5Pcopy");
+        ret = H5Pset_file_space_strategy(fcpl, H5F_FSPACE_STRATEGY_FSM_AGGR, TRUE, 1);
+        CHECK(ret, FAIL, "H5Pset_file_space_strategy");
+    }
     fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl, fapl);
     CHECK(fid, FAIL, "H5Fcreate");
+    if (use_min_dset_oh)
+        CHECK(H5Pclose(fcpl), FAIL, "H5Pclose");
 
-    /* Close file */
     ret = H5Fclose(fid);
     CHECK(ret, FAIL, "H5Fclose");
 
-    /* Get size of file */
     empty_filesize = h5_get_file_size(FILENAME, fapl);
     if(empty_filesize < 0)
         TestErrPrintf("Line %d: file size wrong!\n", __LINE__);
@@ -2768,9 +2835,14 @@ test_attr_dense_unlink(hid_t fcpl, hid_t fapl)
     sid = H5Screate(H5S_SCALAR);
     CHECK(sid, FAIL, "H5Screate");
 
-    /* Query the group creation properties */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    /* need DCPL to query the group creation properties */
+    if (use_min_dset_oh) {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    } else {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    }
 
     /* Create a dataset */
     dataset = H5Dcreate2(fid, DSET1_NAME, H5T_NATIVE_UCHAR, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT);
@@ -2896,9 +2968,14 @@ test_attr_dense_limits(hid_t fcpl, hid_t fapl)
     sid = H5Screate(H5S_SCALAR);
     CHECK(sid, FAIL, "H5Screate");
 
-    /* Query the group creation properties */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    /* need DCPL to query the group creation properties */
+    if (dcpl_g == H5P_DEFAULT) {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    } else {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    }
 
     /* Change limits on compact/dense attribute storage */
     max_compact = 0;
@@ -3063,9 +3140,14 @@ test_attr_dense_dup_ids(hid_t fcpl, hid_t fapl)
     sid = H5Screate(H5S_SCALAR);
     CHECK(sid, FAIL, "H5Screate");
 
-    /* Query the group creation properties */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    /* need DCPL to query the group creation properties */
+    if (dcpl_g == H5P_DEFAULT) {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    } else {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    }
 
     /* Create a dataset */
     dataset = H5Dcreate2(fid, DSET1_NAME, H5T_NATIVE_UCHAR, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT);
@@ -3593,9 +3675,14 @@ test_attr_big(hid_t fcpl, hid_t fapl)
     big_sid = H5Screate_simple(ATTR6_RANK, dims, NULL);
     CHECK(big_sid, FAIL, "H5Screate_simple");
 
-    /* Query the group creation properties */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    /* need DCPL to query the group creation properties */
+    if (dcpl_g == H5P_DEFAULT) {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    } else {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    }
 
     /* Retrieve limits for compact/dense attribute storage */
     ret = H5Pget_attr_phase_change(dcpl, &max_compact, &min_dense);
@@ -3860,7 +3947,7 @@ test_attr_null_space(hid_t fcpl, hid_t fapl)
     CHECK(null_sid, FAIL, "H5Screate");
 
     /* Create a dataset */
-    dataset = H5Dcreate2(fid, DSET1_NAME, H5T_NATIVE_UCHAR, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    dataset = H5Dcreate2(fid, DSET1_NAME, H5T_NATIVE_UCHAR, sid, H5P_DEFAULT, dcpl_g, H5P_DEFAULT);
     CHECK(dataset, FAIL, "H5Dcreate2");
 
 
@@ -4053,7 +4140,7 @@ test_attr_deprec(hid_t fcpl, hid_t fapl)
     CHECK(sid, FAIL, "H5Screate");
 
     /* Create a dataset */
-    dataset = H5Dcreate2(fid, DSET1_NAME, H5T_NATIVE_UCHAR, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    dataset = H5Dcreate2(fid, DSET1_NAME, H5T_NATIVE_UCHAR, sid, H5P_DEFAULT, dcpl_g, H5P_DEFAULT);
     CHECK(dataset, FAIL, "H5Dcreate2");
 
 
@@ -4288,8 +4375,13 @@ test_attr_corder_create_basic(hid_t fcpl, hid_t fapl)
     CHECK(fid, FAIL, "H5Fcreate");
 
     /* Create dataset creation property list */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    if (dcpl_g == H5P_DEFAULT) {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    } else {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    }
 
     /* Get creation order indexing on object */
     ret = H5Pget_attr_creation_order(dcpl, &crt_order_flags);
@@ -4411,8 +4503,13 @@ test_attr_corder_create_compact(hid_t fcpl, hid_t fapl)
     CHECK(fid, FAIL, "H5Fcreate");
 
     /* Create dataset creation property list */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    if (dcpl_g == H5P_DEFAULT) {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    } else {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    }
 
     /* Set attribute creation order tracking & indexing for object */
     ret = H5Pset_attr_creation_order(dcpl, (H5P_CRT_ORDER_TRACKED | H5P_CRT_ORDER_INDEXED));
@@ -4611,8 +4708,13 @@ test_attr_corder_create_dense(hid_t fcpl, hid_t fapl)
     CHECK(fid, FAIL, "H5Fcreate");
 
     /* Create dataset creation property list */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    if (dcpl_g == H5P_DEFAULT) {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    } else {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    }
 
     /* Set attribute creation order tracking & indexing for object */
     ret = H5Pset_attr_creation_order(dcpl, (H5P_CRT_ORDER_TRACKED | H5P_CRT_ORDER_INDEXED));
@@ -4946,8 +5048,13 @@ test_attr_corder_transition(hid_t fcpl, hid_t fapl)
     CHECK(fid, FAIL, "H5Fcreate");
 
     /* Create dataset creation property list */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    if (dcpl_g == H5P_DEFAULT) {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    } else {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    }
 
     /* Set attribute creation order tracking & indexing for object */
     ret = H5Pset_attr_creation_order(dcpl, (H5P_CRT_ORDER_TRACKED | H5P_CRT_ORDER_INDEXED));
@@ -5357,8 +5464,13 @@ test_attr_corder_delete(hid_t fcpl, hid_t fapl)
     CHECK(sid, FAIL, "H5Screate");
 
     /* Create dataset creation property list */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    if (dcpl_g == H5P_DEFAULT) {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    } else {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    }
 
     /* Set attribute creation order tracking & indexing for object */
     ret = H5Pset_attr_creation_order(dcpl, (H5P_CRT_ORDER_TRACKED | H5P_CRT_ORDER_INDEXED));
@@ -5700,8 +5812,13 @@ test_attr_info_by_idx(hbool_t new_format, hid_t fcpl, hid_t fapl)
     CHECK(sid, FAIL, "H5Screate");
 
     /* Create dataset creation property list */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    if (dcpl_g == H5P_DEFAULT) {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    } else {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    }
 
     /* Query the attribute creation properties */
     ret = H5Pget_attr_phase_change(dcpl, &max_compact, &min_dense);
@@ -5875,6 +5992,208 @@ test_attr_info_by_idx(hbool_t new_format, hid_t fcpl, hid_t fapl)
 }   /* test_attr_info_by_idx() */
 
 
+/***************************************************************
+**
+**  test_attr_info_null_info_pointer(): A test to ensure that
+**      passing a NULL attribute info pointer to H5Aget_info
+**      (_by_name/_by_idx) doesn't cause bad behavior.
+**
+****************************************************************/
+static void
+test_attr_info_null_info_pointer(hid_t fcpl, hid_t fapl)
+{
+    herr_t err_ret = -1;
+    hid_t  fid;
+    hid_t  attr;
+    hid_t  sid;
+
+    /* Create dataspace for attribute */
+    sid = H5Screate(H5S_SCALAR);
+    CHECK(sid, FAIL, "H5Screate");
+
+    /* Create file */
+    fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl, fapl);
+    CHECK(fid, FAIL, "H5Fcreate");
+
+    /* Create attribute */
+    attr = H5Acreate2(fid, GET_INFO_NULL_POINTER_ATTR_NAME, H5T_NATIVE_UINT, sid, H5P_DEFAULT, H5P_DEFAULT);
+    CHECK(attr, FAIL, "H5Acreate2");
+
+    H5E_BEGIN_TRY {
+        err_ret = H5Aget_info(attr, NULL);
+    } H5E_END_TRY;
+
+    CHECK(err_ret, SUCCEED, "H5Aget_info");
+
+    H5E_BEGIN_TRY {
+        err_ret = H5Aget_info_by_name(fid, ".", GET_INFO_NULL_POINTER_ATTR_NAME, NULL, H5P_DEFAULT);
+    } H5E_END_TRY;
+
+    CHECK(err_ret, SUCCEED, "H5Aget_info_by_name");
+
+    H5E_BEGIN_TRY {
+        err_ret = H5Aget_info_by_idx(fid, ".", H5_INDEX_NAME, H5_ITER_INC, 0, NULL, H5P_DEFAULT);
+    } H5E_END_TRY;
+
+    CHECK(err_ret, SUCCEED, "H5Aget_info_by_idx");
+
+    /* Close dataspace */
+    err_ret = H5Sclose(sid);
+    CHECK(err_ret, FAIL, "H5Sclose");
+
+    /* Close attribute */
+    err_ret = H5Aclose(attr);
+    CHECK(err_ret, FAIL, "H5Aclose");
+
+    /* Close file */
+    err_ret = H5Fclose(fid);
+    CHECK(err_ret, FAIL, "H5Fclose");
+}
+
+
+/***************************************************************
+**
+**  test_attr_rename_invalid_name(): A test to ensure that
+**      passing a NULL or empty attribute name to
+**      H5Arename(_by_name) doesn't cause bad behavior.
+**
+****************************************************************/
+static void
+test_attr_rename_invalid_name(hid_t fcpl, hid_t fapl)
+{
+    herr_t err_ret = -1;
+    hid_t  fid;
+    hid_t  attr;
+    hid_t  sid;
+
+    /* Create dataspace for attribute */
+    sid = H5Screate(H5S_SCALAR);
+    CHECK(sid, FAIL, "H5Screate");
+
+    /* Create file */
+    fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl, fapl);
+    CHECK(fid, FAIL, "H5Fcreate");
+
+    /* Create attribute */
+    attr = H5Acreate2(fid, INVALID_RENAME_TEST_ATTR_NAME, H5T_NATIVE_UINT, sid, H5P_DEFAULT, H5P_DEFAULT);
+    CHECK(attr, FAIL, "H5Acreate2");
+
+    H5E_BEGIN_TRY {
+        err_ret = H5Arename(fid, NULL, INVALID_RENAME_TEST_NEW_ATTR_NAME);
+    } H5E_END_TRY;
+
+    CHECK(err_ret, SUCCEED, "H5Arename");
+
+    H5E_BEGIN_TRY {
+        err_ret = H5Arename(fid, "", INVALID_RENAME_TEST_NEW_ATTR_NAME);
+    } H5E_END_TRY;
+
+    CHECK(err_ret, SUCCEED, "H5Arename");
+
+    H5E_BEGIN_TRY {
+        err_ret = H5Arename(fid, INVALID_RENAME_TEST_ATTR_NAME, NULL);
+    } H5E_END_TRY;
+
+    CHECK(err_ret, SUCCEED, "H5Arename");
+
+    H5E_BEGIN_TRY {
+        err_ret = H5Arename(fid, INVALID_RENAME_TEST_ATTR_NAME, "");
+    } H5E_END_TRY;
+
+    CHECK(err_ret, SUCCEED, "H5Arename");
+
+    H5E_BEGIN_TRY {
+        err_ret = H5Arename_by_name(fid, ".", NULL, INVALID_RENAME_TEST_NEW_ATTR_NAME, H5P_DEFAULT);
+    } H5E_END_TRY;
+
+    CHECK(err_ret, SUCCEED, "H5Arename_by_name");
+
+    H5E_BEGIN_TRY {
+        err_ret = H5Arename_by_name(fid, ".", "", INVALID_RENAME_TEST_NEW_ATTR_NAME, H5P_DEFAULT);
+    } H5E_END_TRY;
+
+    CHECK(err_ret, SUCCEED, "H5Arename_by_name");
+
+    H5E_BEGIN_TRY {
+        err_ret = H5Arename_by_name(fid, ".", INVALID_RENAME_TEST_ATTR_NAME, NULL, H5P_DEFAULT);
+    } H5E_END_TRY;
+
+    CHECK(err_ret, SUCCEED, "H5Arename_by_name");
+
+    H5E_BEGIN_TRY {
+        err_ret = H5Arename_by_name(fid, ".", INVALID_RENAME_TEST_ATTR_NAME, "", H5P_DEFAULT);
+    } H5E_END_TRY;
+
+    CHECK(err_ret, SUCCEED, "H5Arename_by_name");
+
+    /* Close dataspace */
+    err_ret = H5Sclose(sid);
+    CHECK(err_ret, FAIL, "H5Sclose");
+
+    /* Close attribute */
+    err_ret = H5Aclose(attr);
+    CHECK(err_ret, FAIL, "H5Aclose");
+
+    /* Close file */
+    err_ret = H5Fclose(fid);
+    CHECK(err_ret, FAIL, "H5Fclose");
+}
+
+
+/***************************************************************
+**
+**  test_attr_get_name_invalid_buf(): A test to ensure that
+**      passing a NULL buffer to H5Aget_name(_by_idx) when
+**      the 'size' parameter is non-zero doesn't cause bad
+**      behavior.
+**
+****************************************************************/
+static void
+test_attr_get_name_invalid_buf(hid_t fcpl, hid_t fapl)
+{
+    ssize_t err_ret = -1;
+    hid_t   fid;
+    hid_t   attr;
+    hid_t   sid;
+
+    /* Create dataspace for attribute */
+    sid = H5Screate(H5S_SCALAR);
+    CHECK(sid, FAIL, "H5Screate");
+
+    /* Create file */
+    fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl, fapl);
+    CHECK(fid, FAIL, "H5Fcreate");
+
+    /* Create attribute */
+    attr = H5Acreate2(fid, GET_NAME_INVALID_BUF_TEST_ATTR_NAME, H5T_NATIVE_UINT, sid, H5P_DEFAULT, H5P_DEFAULT);
+    CHECK(attr, FAIL, "H5Acreate2");
+
+    H5E_BEGIN_TRY {
+        err_ret = H5Aget_name(attr, 1, NULL);
+    } H5E_END_TRY;
+
+    VERIFY(err_ret, FAIL, "H5Aget_name");
+
+    H5E_BEGIN_TRY {
+        err_ret = H5Aget_name_by_idx(fid, ".", H5_INDEX_NAME, H5_ITER_INC, 0, NULL, 1, H5P_DEFAULT);
+    } H5E_END_TRY;
+
+    VERIFY(err_ret, FAIL, "H5Aget_name_by_idx");
+
+    /* Close dataspace */
+    err_ret = H5Sclose(sid);
+    CHECK(err_ret, FAIL, "H5Sclose");
+
+    /* Close attribute */
+    err_ret = H5Aclose(attr);
+    CHECK(err_ret, FAIL, "H5Aclose");
+
+    /* Close file */
+    err_ret = H5Fclose(fid);
+    CHECK(err_ret, FAIL, "H5Fclose");
+}
+
+
 /****************************************************************
 **
 **  test_attr_delete_by_idx(): Test basic H5A (attribute) code.
@@ -5912,8 +6231,13 @@ test_attr_delete_by_idx(hbool_t new_format, hid_t fcpl, hid_t fapl)
     CHECK(sid, FAIL, "H5Screate");
 
     /* Create dataset creation property list */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    if (dcpl_g == H5P_DEFAULT) {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    } else {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    }
 
     /* Query the attribute creation properties */
     ret = H5Pget_attr_phase_change(dcpl, &max_compact, &min_dense);
@@ -6855,8 +7179,13 @@ test_attr_iterate2(hbool_t new_format, hid_t fcpl, hid_t fapl)
     CHECK(sid, FAIL, "H5Screate");
 
     /* Create dataset creation property list */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    if (dcpl_g == H5P_DEFAULT) {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    } else {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    }
 
     /* Query the attribute creation properties */
     ret = H5Pget_attr_phase_change(dcpl, &max_compact, &min_dense);
@@ -7216,8 +7545,13 @@ test_attr_open_by_idx(hbool_t new_format, hid_t fcpl, hid_t fapl)
     CHECK(sid, FAIL, "H5Screate");
 
     /* Create dataset creation property list */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    if (dcpl_g == H5P_DEFAULT) {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    } else {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    }
 
     /* Query the attribute creation properties */
     ret = H5Pget_attr_phase_change(dcpl, &max_compact, &min_dense);
@@ -7563,8 +7897,13 @@ test_attr_open_by_name(hbool_t new_format, hid_t fcpl, hid_t fapl)
     CHECK(sid, FAIL, "H5Screate");
 
     /* Create dataset creation property list */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    if (dcpl_g == H5P_DEFAULT) {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    } else {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    }
 
     /* Query the attribute creation properties */
     ret = H5Pget_attr_phase_change(dcpl, &max_compact, &min_dense);
@@ -7817,8 +8156,13 @@ test_attr_create_by_name(hbool_t new_format, hid_t fcpl, hid_t fapl)
     CHECK(sid, FAIL, "H5Screate");
 
     /* Create dataset creation property list */
-    dcpl = H5Pcreate(H5P_DATASET_CREATE);
-    CHECK(dcpl, FAIL, "H5Pcreate");
+    if (dcpl_g == H5P_DEFAULT) {
+        dcpl = H5Pcreate(H5P_DATASET_CREATE);
+        CHECK(dcpl, FAIL, "H5Pcreate");
+    } else {
+        dcpl = H5Pcopy(dcpl_g);
+        CHECK(dcpl, FAIL, "H5Pcopy");
+    }
 
     /* Query the attribute creation properties */
     ret = H5Pget_attr_phase_change(dcpl, &max_compact, &min_dense);
@@ -8118,8 +8462,13 @@ test_attr_shared_write(hid_t fcpl, hid_t fapl)
         } /* end if */
 
         /* Set up to query the object creation properties */
-        dcpl = H5Pcreate(H5P_DATASET_CREATE);
-        CHECK(dcpl, FAIL, "H5Pcreate");
+        if (dcpl_g == H5P_DEFAULT) {
+            dcpl = H5Pcreate(H5P_DATASET_CREATE);
+            CHECK(dcpl, FAIL, "H5Pcreate");
+        } else {
+            dcpl = H5Pcopy(dcpl_g);
+            CHECK(dcpl, FAIL, "H5Pcopy");
+        }
 
         /* Create datasets */
         dataset = H5Dcreate2(fid, DSET1_NAME, H5T_NATIVE_UCHAR, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT);
@@ -8449,8 +8798,13 @@ test_attr_shared_rename(hid_t fcpl, hid_t fapl)
         } /* end if */
 
         /* Set up to query the object creation properties */
-        dcpl = H5Pcreate(H5P_DATASET_CREATE);
-        CHECK(dcpl, FAIL, "H5Pcreate");
+        if (dcpl_g == H5P_DEFAULT) {
+            dcpl = H5Pcreate(H5P_DATASET_CREATE);
+            CHECK(dcpl, FAIL, "H5Pcreate");
+        } else {
+            dcpl = H5Pcopy(dcpl_g);
+            CHECK(dcpl, FAIL, "H5Pcopy");
+        }
 
         /* Create datasets */
         dataset = H5Dcreate2(fid, DSET1_NAME, H5T_NATIVE_UCHAR, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT);
@@ -8895,8 +9249,13 @@ test_attr_shared_delete(hid_t fcpl, hid_t fapl)
         } /* end if */
 
         /* Set up to query the object creation properties */
-        dcpl = H5Pcreate(H5P_DATASET_CREATE);
-        CHECK(dcpl, FAIL, "H5Pcreate");
+        if (dcpl_g == H5P_DEFAULT) {
+            dcpl = H5Pcreate(H5P_DATASET_CREATE);
+            CHECK(dcpl, FAIL, "H5Pcreate");
+        } else {
+            dcpl = H5Pcopy(dcpl_g);
+            CHECK(dcpl, FAIL, "H5Pcopy");
+        }
 
         /* Create datasets */
         dataset = H5Dcreate2(fid, DSET1_NAME, H5T_NATIVE_UCHAR, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT);
@@ -9264,8 +9623,13 @@ test_attr_shared_unlink(hid_t fcpl, hid_t fapl)
         } /* end if */
 
         /* Set up to query the object creation properties */
-        dcpl = H5Pcreate(H5P_DATASET_CREATE);
-        CHECK(dcpl, FAIL, "H5Pcreate");
+        if (dcpl_g == H5P_DEFAULT) {
+            dcpl = H5Pcreate(H5P_DATASET_CREATE);
+            CHECK(dcpl, FAIL, "H5Pcreate");
+        } else {
+            dcpl = H5Pcopy(dcpl_g);
+            CHECK(dcpl, FAIL, "H5Pcopy");
+        }
 
         /* Create datasets */
         dataset = H5Dcreate2(fid, DSET1_NAME, H5T_NATIVE_UCHAR, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT);
@@ -9856,7 +10220,7 @@ test_attr_bug3(hid_t fcpl, hid_t fapl)
     CHECK(ret, FAIL, "H5Tcommit2");
 
     /* Create dataset */
-    did = H5Dcreate2(fid, "dset", tid2, sid2, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    did = H5Dcreate2(fid, "dset", tid2, sid2, H5P_DEFAULT, dcpl_g, H5P_DEFAULT);
     CHECK(did, FAIL, "H5Dcreate2");
 
     /* Create attribute on datatype, using that datatype as its datatype */
@@ -9991,7 +10355,7 @@ test_attr_bug4(hid_t fcpl, hid_t fapl)
     CHECK(ret, FAIL, "H5Tcommit2");
 
     /* Create dataset */
-    did = H5Dcreate2(fid, "dset", tid, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    did = H5Dcreate2(fid, "dset", tid, sid, H5P_DEFAULT, dcpl_g, H5P_DEFAULT);
     CHECK(did, FAIL, "H5Dcreate2");
 
     /* Create attributes on group and dataset */
@@ -10073,7 +10437,7 @@ test_attr_bug5(hid_t fcpl, hid_t fapl)
     CHECK(ret, FAIL, "H5Tcommit2");
 
     /* Create dataset */
-    did1 = H5Dcreate2(fid1, BUG3_DSET_NAME, tid1, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    did1 = H5Dcreate2(fid1, BUG3_DSET_NAME, tid1, sid, H5P_DEFAULT, dcpl_g, H5P_DEFAULT);
     CHECK(did1, FAIL, "H5Dcreate2");
 
     /* Create attribute on root group */
@@ -10771,120 +11135,107 @@ test_attr(void)
 {
     hid_t    fapl = (-1), fapl2 = (-1);    /* File access property lists */
     hid_t    fcpl = (-1), fcpl2 = (-1);    /* File creation property lists */
-    unsigned new_format;        /* Whether to use the new format or not */
-    unsigned use_shared;        /* Whether to use shared attributes or not */
-    herr_t ret;                 /* Generic return value */
+    hid_t    dcpl = -1;
+    unsigned new_format;       /* Whether to use the new format or not */
+    unsigned use_shared;       /* Whether to use shared attributes or not */
+    unsigned minimize_dset_oh; /* Whether to use minimized dataset object headers */
+    herr_t ret;                /* Generic return value */
 
-    /* Output message about test being performed */
     MESSAGE(5, ("Testing Attributes\n"));
 
-    /* Create a default file access property list */
     fapl = H5Pcreate(H5P_FILE_ACCESS);
     CHECK(fapl, FAIL, "H5Pcreate");
 
-    /* Copy the file access property list */
     fapl2 = H5Pcopy(fapl);
     CHECK(fapl2, FAIL, "H5Pcopy");
-
-    /* Set the "use the latest version of the format" bounds for creating objects in the file */
     ret = H5Pset_libver_bounds(fapl2, H5F_LIBVER_LATEST, H5F_LIBVER_LATEST);
     CHECK(ret, FAIL, "H5Pset_libver_bounds");
 
-    /* Create a default file creation property list */
     fcpl = H5Pcreate(H5P_FILE_CREATE);
     CHECK(fcpl, FAIL, "H5Pcreate");
 
-    /* Copy the file creation property list */
+    /* files with fcpl2 make all attributes ( > 1 byte) shared
+     * (i.e. all of them :-) */
     fcpl2 = H5Pcopy(fcpl);
     CHECK(fcpl2, FAIL, "H5Pcopy");
-
-    /* Make attributes > 1 byte shared (i.e. all of them :-) */
     ret = H5Pset_shared_mesg_nindexes(fcpl2, (unsigned)1);
     CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
     ret = H5Pset_shared_mesg_index(fcpl2, (unsigned)0, H5O_SHMESG_ATTR_FLAG, (unsigned)1);
     CHECK_I(ret, "H5Pset_shared_mesg_index");
 
-    /* Loop over using new group format */
-    for(new_format = FALSE; new_format <= TRUE; new_format++) {
-        hid_t my_fapl;
+    for(minimize_dset_oh = 0; minimize_dset_oh <= 1; minimize_dset_oh++) {
+        if(minimize_dset_oh == 0) {
+            MESSAGE(7, ("testing with default dataset object headers\n"));
+            dcpl_g = H5P_DEFAULT;
+        } else {
+            MESSAGE(7, ("testing with minimzied dataset object headers\n"));
+            dcpl = H5Pcreate(H5P_DATASET_CREATE);
+            CHECK(dcpl, FAIL, "H5Pcreate");
+            ret = H5Pset_dset_no_attrs_hint(dcpl, TRUE);
+            CHECK_I(ret, "H5Pset_dset_no_attrs_hint");
+            dcpl_g = dcpl;
+        }
+
+        for(new_format = FALSE; new_format <= TRUE; new_format++) {
+            hid_t my_fapl;
 
-        /* Set the FAPL for the type of format */
-        if(new_format) {
-            MESSAGE(7, ("testing with new file format\n"));
-            my_fapl = fapl2;
-        } /* end if */
-        else {
-            MESSAGE(7, ("testing with old file format\n"));
-            my_fapl = fapl;
-        } /* end else */
+            if(new_format) {
+                MESSAGE(7, ("testing with new file format\n"));
+                my_fapl = fapl2;
+            } else {
+                MESSAGE(7, ("testing with old file format\n"));
+                my_fapl = fapl;
+            }
 
-        /* These next two tests use the same file information */
-        test_attr_basic_write(my_fapl);    /* Test basic H5A writing code */
-        test_attr_basic_read(my_fapl);     /* Test basic H5A reading code */
+            /* These next two tests use the same file information */
+            test_attr_basic_write(my_fapl);    /* Test basic H5A writing code */
+            test_attr_basic_read(my_fapl);     /* Test basic H5A reading code */
 
-        /* These next two tests use their own file information */
-        test_attr_flush(my_fapl);          /* Test H5A I/O in the presence of H5Fflush calls */
-        test_attr_plist(my_fapl);          /* Test attribute property lists */
+            /* These next two tests use their own file information */
+            test_attr_flush(my_fapl);          /* Test H5A I/O in the presence of H5Fflush calls */
+            test_attr_plist(my_fapl);          /* Test attribute property lists */
 
-        /* These next two tests use the same file information */
-        test_attr_compound_write(my_fapl);  /* Test complex datatype H5A writing code */
-        test_attr_compound_read(my_fapl);   /* Test complex datatype H5A reading code */
+            /* These next two tests use the same file information */
+            test_attr_compound_write(my_fapl);  /* Test complex datatype H5A writing code */
+            test_attr_compound_read(my_fapl);   /* Test complex datatype H5A reading code */
 
-        /* These next two tests use the same file information */
-        test_attr_scalar_write(my_fapl);  /* Test scalar dataspace H5A writing code */
-        test_attr_scalar_read(my_fapl);   /* Test scalar dataspace H5A reading code */
+            /* These next two tests use the same file information */
+            test_attr_scalar_write(my_fapl);  /* Test scalar dataspace H5A writing code */
+            test_attr_scalar_read(my_fapl);   /* Test scalar dataspace H5A reading code */
 
-        /* These next four tests use the same file information */
-        test_attr_mult_write(my_fapl);     /* Test H5A writing code for multiple attributes */
-        test_attr_mult_read(my_fapl);      /* Test H5A reading code for multiple attributes */
-        test_attr_iterate(my_fapl);        /* Test H5A iterator code */
-        test_attr_delete(my_fapl);         /* Test H5A code for deleting attributes */
+            /* These next four tests use the same file information */
+            test_attr_mult_write(my_fapl);     /* Test H5A writing code for multiple attributes */
+            test_attr_mult_read(my_fapl);      /* Test H5A reading code for multiple attributes */
+            test_attr_iterate(my_fapl);        /* Test H5A iterator code */
+            test_attr_delete(my_fapl);         /* Test H5A code for deleting attributes */
 
-        /* This next test uses its own file information */
-        test_attr_dtype_shared(my_fapl);   /* Test using shared dataypes in attributes */
+            /* This next test uses its own file information */
+            test_attr_dtype_shared(my_fapl);   /* Test using shared dataypes in attributes */
 
-        /* This next test uses its own file information */
-        test_attr_duplicate_ids(my_fapl);
+            /* This next test uses its own file information */
+            test_attr_duplicate_ids(my_fapl);
 
-        /* Tests on "new format" attribute storage */
-        if(new_format == TRUE) {
-            /* Loop over using shared attributes */
             for(use_shared = FALSE; use_shared <= TRUE; use_shared++) {
                 hid_t my_fcpl;
 
-                /* Set the FCPL for shared or not */
-                if(use_shared) {
+                if(new_format == TRUE && use_shared) {
                     MESSAGE(7, ("testing with shared attributes\n"));
                     my_fcpl = fcpl2;
-                } /* end if */
-                else {
+                } else {
                     MESSAGE(7, ("testing without shared attributes\n"));
                     my_fcpl = fcpl;
-                } /* end else */
-
-                /* General attribute tests */
-                test_attr_dense_create(my_fcpl, my_fapl);       /* Test dense attribute storage creation */
-                test_attr_dense_open(my_fcpl, my_fapl);         /* Test opening attributes in dense storage */
-                test_attr_dense_delete(my_fcpl, my_fapl);       /* Test deleting attributes in dense storage */
-                test_attr_dense_rename(my_fcpl, my_fapl);       /* Test renaming attributes in dense storage */
-                test_attr_dense_unlink(my_fcpl, my_fapl);       /* Test unlinking object with attributes in dense storage */
-                test_attr_dense_limits(my_fcpl, my_fapl);       /* Test dense attribute storage limits */
-                test_attr_dense_dup_ids(my_fcpl, my_fapl);      /* Test duplicated IDs for dense attribute storage */
+                }
 
                 test_attr_big(my_fcpl, my_fapl);                /* Test storing big attribute */
                 test_attr_null_space(my_fcpl, my_fapl);         /* Test storing attribute with NULL dataspace */
                 test_attr_deprec(fcpl, my_fapl);                /* Test deprecated API routines */
                 test_attr_many(new_format, my_fcpl, my_fapl);               /* Test storing lots of attributes */
+                test_attr_info_null_info_pointer(my_fcpl, my_fapl); /* Test passing a NULL attribute info pointer to H5Aget_info(_by_name/_by_idx) */
+                test_attr_rename_invalid_name(my_fcpl, my_fapl); /* Test passing a NULL or empty attribute name to H5Arename(_by_name) */
+                test_attr_get_name_invalid_buf(my_fcpl, my_fapl); /* Test passing NULL buffer to H5Aget_name(_by_idx) */
 
-                /* Attribute creation order tests */
-                test_attr_corder_create_basic(my_fcpl, my_fapl);/* Test creating an object w/attribute creation order info */
-                test_attr_corder_create_compact(my_fcpl, my_fapl);  /* Test compact attribute storage on an object w/attribute creation order info */
-                test_attr_corder_create_dense(my_fcpl, my_fapl);/* Test dense attribute storage on an object w/attribute creation order info */
-                test_attr_corder_create_reopen(my_fcpl, my_fapl);/* Test creating attributes w/reopening file from using new format to using old format */
-                test_attr_corder_transition(my_fcpl, my_fapl);  /* Test attribute storage transitions on an object w/attribute creation order info */
-                test_attr_corder_delete(my_fcpl, my_fapl);      /* Test deleting object using dense storage w/attribute creation order info */
-
-                /* New attribute API routine tests */
+                /* New attribute API routine tests
+                 */
                 test_attr_info_by_idx(new_format, my_fcpl, my_fapl);    /* Test querying attribute info by index */
                 test_attr_delete_by_idx(new_format, my_fcpl, my_fapl);  /* Test deleting attribute by index */
                 test_attr_iterate2(new_format, my_fcpl, my_fapl);       /* Test iterating over attributes by index */
@@ -10892,56 +11243,68 @@ test_attr(void)
                 test_attr_open_by_name(new_format, my_fcpl, my_fapl);   /* Test opening attributes by name */
                 test_attr_create_by_name(new_format, my_fcpl, my_fapl); /* Test creating attributes by name */
 
-                /* More complex tests with both "new format" and "shared" attributes */
-                if(use_shared == TRUE) {
-                    test_attr_shared_write(my_fcpl, my_fapl);   /* Test writing to shared attributes in compact & dense storage */
-                    test_attr_shared_rename(my_fcpl, my_fapl);  /* Test renaming shared attributes in compact & dense storage */
-                    test_attr_shared_delete(my_fcpl, my_fapl);  /* Test deleting shared attributes in compact & dense storage */
-                    test_attr_shared_unlink(my_fcpl, my_fapl);  /* Test unlinking object with shared attributes in compact & dense storage */
-                } /* end if */
-
-                /* Tests that address specific bugs */
+                /* Tests that address specific bugs
+                 */
                 test_attr_bug1(my_fcpl, my_fapl);               /* Test odd allocation operations */
                 test_attr_bug2(my_fcpl, my_fapl);               /* Test many deleted attributes */
                 test_attr_bug3(my_fcpl, my_fapl);               /* Test "self referential" attributes */
                 test_attr_bug4(my_fcpl, my_fapl);               /* Test attributes on named datatypes */
                 test_attr_bug5(my_fcpl, my_fapl);               /* Test opening/closing attributes through different file handles */
                 test_attr_bug6(my_fcpl, my_fapl);               /* Test reading empty attribute */
-                test_attr_bug7(my_fcpl, my_fapl);               /* Test creating and deleting large attributes in ohdr chunk 0 */
+                /* test_attr_bug7 is specific to the "new" object header format,
+                 * and in fact fails if used with the old format due to the
+                 * attributes being larger than 64K */
                 test_attr_bug8(my_fcpl, my_fapl);               /* Test attribute expanding object header with undecoded messages */
                 test_attr_bug9(my_fcpl, my_fapl);               /* Test large attributes converting to dense storage */
-                test_attr_delete_last_dense(my_fcpl, my_fapl);  /* Test */
-            } /* end for */
-        } /* end if */
-        else {
-            /* General attribute tests */
-            test_attr_big(fcpl, my_fapl);                       /* Test storing big attribute */
-            test_attr_null_space(fcpl, my_fapl);                /* Test storing attribute with NULL dataspace */
-            test_attr_deprec(fcpl, my_fapl);                    /* Test deprecated API routines */
-            test_attr_many(new_format, fcpl, my_fapl);               /* Test storing lots of attributes */
-
-            /* New attribute API routine tests, on old-format storage */
-            test_attr_info_by_idx(new_format, fcpl, my_fapl);   /* Test querying attribute info by index */
-            test_attr_delete_by_idx(new_format, fcpl, my_fapl); /* Test deleting attribute by index */
-            test_attr_iterate2(new_format, fcpl, my_fapl);      /* Test iterating over attributes by index */
-            test_attr_open_by_idx(new_format, fcpl, my_fapl);   /* Test opening attributes by index */
-            test_attr_open_by_name(new_format, fcpl, my_fapl);  /* Test opening attributes by name */
-            test_attr_create_by_name(new_format, fcpl, my_fapl); /* Test creating attributes by name */
-
-            /* Tests that address specific bugs */
-            test_attr_bug1(fcpl, my_fapl);                      /* Test odd allocation operations */
-            test_attr_bug2(fcpl, my_fapl);                      /* Test many deleted attributes */
-            test_attr_bug3(fcpl, my_fapl);                      /* Test "self referential" attributes */
-            test_attr_bug4(fcpl, my_fapl);                      /* Test attributes on named datatypes */
-            test_attr_bug5(fcpl, my_fapl);                      /* Test opening/closing attributes through different file handles */
-            test_attr_bug6(fcpl, my_fapl);                      /* Test reading empty attribute */
-            /* Skip test_attr_bug7 because it is specific to the new object
-             * header format and in fact fails if used with the old format, due
-             * to the attributes being larger than 64K */
-            test_attr_bug8(fcpl, my_fapl);                      /* Test attribute expanding object header with undecoded messages */
-            test_attr_bug9(fcpl, my_fapl);                      /* Test large attributes converting to dense storage */
-        } /* end else */
-    } /* end for */
+
+                /* tests specific to the "new format"
+                 */
+                if (new_format == TRUE) {
+                    /* General attribute tests */
+                    test_attr_dense_create(my_fcpl, my_fapl);       /* Test dense attribute storage creation */
+                    test_attr_dense_open(my_fcpl, my_fapl);         /* Test opening attributes in dense storage */
+                    test_attr_dense_delete(my_fcpl, my_fapl);       /* Test deleting attributes in dense storage */
+                    test_attr_dense_rename(my_fcpl, my_fapl);       /* Test renaming attributes in dense storage */
+                    test_attr_dense_unlink(my_fcpl, my_fapl);       /* Test unlinking object with attributes in dense storage */
+                    test_attr_dense_limits(my_fcpl, my_fapl);       /* Test dense attribute storage limits */
+                    test_attr_dense_dup_ids(my_fcpl, my_fapl);      /* Test duplicated IDs for dense attribute storage */
+
+                    /* Attribute creation order tests
+                     */
+                    test_attr_corder_create_basic(my_fcpl, my_fapl);/* Test creating an object w/attribute creation order info */
+                    test_attr_corder_create_compact(my_fcpl, my_fapl);  /* Test compact attribute storage on an object w/attribute creation order info */
+                    test_attr_corder_create_dense(my_fcpl, my_fapl);/* Test dense attribute storage on an object w/attribute creation order info */
+                    test_attr_corder_create_reopen(my_fcpl, my_fapl);/* Test creating attributes w/reopening file from using new format to using old format */
+                    test_attr_corder_transition(my_fcpl, my_fapl);  /* Test attribute storage transitions on an object w/attribute creation order info */
+                    test_attr_corder_delete(my_fcpl, my_fapl);      /* Test deleting object using dense storage w/attribute creation order info */
+
+                    /* More complex tests with exclusively both "new format" and "shared" attributes
+                     */
+                    if(use_shared == TRUE) {
+                        test_attr_shared_write(my_fcpl, my_fapl);   /* Test writing to shared attributes in compact & dense storage */
+                        test_attr_shared_rename(my_fcpl, my_fapl);  /* Test renaming shared attributes in compact & dense storage */
+                        test_attr_shared_delete(my_fcpl, my_fapl);  /* Test deleting shared attributes in compact & dense storage */
+                        test_attr_shared_unlink(my_fcpl, my_fapl);  /* Test unlinking object with shared attributes in compact & dense storage */
+                    } /* if using shared attributes */
+
+                    test_attr_delete_last_dense(my_fcpl, my_fapl);
+
+                    /* test_attr_bug7 is specific to the "new" object header format,
+                     * and in fact fails if used with the old format due to the
+                     * attributes being larger than 64K */
+                    test_attr_bug7(my_fcpl, my_fapl);               /* Test creating and deleting large attributes in ohdr chunk 0 */
+
+                } /* if using "new format" */
+            } /* for unshared/shared attributes */
+        } /* for old/new format */
+
+        if (minimize_dset_oh != 0) {
+            ret = H5Pclose(dcpl);
+            CHECK(ret, FAIL, "H5Pclose");
+            dcpl_g = H5P_DEFAULT;
+        }
+
+    } /* for default/minimized dataset object headers */
 
     /* Close  FCPLs */
     ret = H5Pclose(fcpl);
diff --git a/test/tbogus.h5 b/test/tbogus.h5
index 91ab76f..efcbd79 100644
--- a/test/tbogus.h5
+++ b/test/tbogus.h5
diff --git a/test/test_vol_plugin.sh.in b/test/test_vol_plugin.sh.in
new file mode 100644
index 0000000..38220ef
--- /dev/null
+++ b/test/test_vol_plugin.sh.in
@@ -0,0 +1,84 @@
+#! /bin/sh
+#
+# Copyright by The HDF Group.                                              
+# All rights reserved.                                                     
+#                                                                          
+# This file is part of HDF5. The full HDF5 copyright notice, including     
+# terms governing use, modification, and redistribution, is contained in   
+# the COPYING file, which can be found at the root of the source code
+# distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.
+# If you do not have access to either file, you may request a copy from
+# help@hdfgroup.org.
+#
+# This shell script is for testing VOL connector plugins.
+#
+srcdir=@srcdir@
+TOP_BUILDDIR=@top_builddir@
+
+EXIT_SUCCESS=0
+EXIT_FAILURE=1
+
+nerrors=0
+verbose=yes
+exit_code=$EXIT_SUCCESS
+
+TEST_NAME=vol_plugin
+TEST_BIN=`pwd`/$TEST_NAME
+FROM_DIR=`pwd`/.libs
+case $(uname) in
+    CYGWIN* )
+        NULL_VOL_PLUGIN="$FROM_DIR/cygnull_vol_connector*"
+        ;;
+    *)
+        NULL_VOL_PLUGIN="$FROM_DIR/libnull_vol_connector*"
+        ;;
+esac
+TEMP_PLUGIN_DIR=null_vol_plugin_dir
+CP="cp -p"    # Use -p to preserve mode,ownership, timestamps
+RM="rm -rf"
+
+# Print a line-line message left justified in a field of 70 characters
+# beginning with the word "Testing".
+#
+TESTING() {
+    SPACES="                                                               "
+    echo "Testing $* $SPACES" | cut -c1-70 | tr -d '\012'
+}
+
+# Main Body
+# Create test directory if necessary.
+test -d $TEMP_PLUGIN_DIR || mkdir -p $TEMP_PLUGIN_DIR
+if [ $? != 0 ]; then
+    echo "Failed to create VOL connector plugin test directory ($TEMP_PLUGIN_DIR)"
+    exit $EXIT_FAILURE
+fi
+
+# Copy plugin for the tests.
+$CP $NULL_VOL_PLUGIN $TEMP_PLUGIN_DIR
+if [ $? != 0 ]; then
+    echo "Failed to copy NULL VOL plugin ($NULL_VOL_PLUGIN) to test directory."
+    exit $EXIT_FAILURE
+fi
+
+# setup plugin path
+ENVCMD="env HDF5_PLUGIN_PATH=${TEMP_PLUGIN_DIR}"
+
+# Run the test
+$ENVCMD $TEST_BIN
+if [ $? != 0 ]; then
+    nerrors=`expr $nerrors + 1`
+fi
+
+# print results
+if test $nerrors -ne 0 ; then
+    echo "$nerrors errors encountered"
+    exit_code=$EXIT_FAILURE
+else
+    echo "All VOL plugin tests passed."
+    exit_code=$EXIT_SUCCESS
+fi
+
+# Clean up temporary files/directories and leave
+$RM $TEMP_PLUGIN_DIR
+
+exit $exit_code
diff --git a/test/test_filenotclosed.sh.in b/test/testabort_fail.sh.in
index 0b43c5b..925d8a4 100644
--- a/test/test_filenotclosed.sh.in
+++ b/test/testabort_fail.sh.in
@@ -13,6 +13,9 @@
 #
 # Test to verify that the assertion/abort failure is fixed when the application
 # does not close the file. (See HDFFV-10160)
+#
+# Test to verify that the infinite loop closing library/abort failure is fixed 
+# when the application creates and removes dense attributes (See HDFFV-10659)
 
 srcdir=@srcdir@
 
@@ -20,22 +23,44 @@ nerrors=0
 
 ##############################################################################
 ##############################################################################
-###			  T H E   T E S T                                              ###
+###			  T H E   T E S T S                                            ###
 ##############################################################################
 ##############################################################################
-
+#
+#
 echo "Testing file not closed assertion/abort failure"
 TEST_NAME=filenotclosed     # The test name
-TEST_BIN=`pwd`/$TEST_NAME 	# The path of the test binary
+TEST_BIN=`pwd`/$TEST_NAME   # The path of the test binary
 #
 # Run the test
-#$RUNSERIAL $TEST_BIN >/dev/null 2>&1 
-$RUNSERIAL $TEST_BIN 2>&1 
+$RUNSERIAL $TEST_BIN >/dev/null 2>&1 
 exitcode=$?
 if [ $exitcode -eq 0 ]; then
     echo "Test PASSED"
 else
+    echo "Test FAILED"
  	nerrors="`expr $nerrors + 1`"
-	echo "***Error encountered***"
 fi
-exit $nerrors
+#
+#
+echo "Testing infinite loop closing library/abort failure"
+TEST_NAME=del_many_dense_attrs  # The test name
+TEST_BIN=`pwd`/$TEST_NAME 	    # The path of the test binary
+# Run the test
+$RUNSERIAL $TEST_BIN >/dev/null 2>&1 
+exitcode=$?
+if [ $exitcode -eq 0 ]; then
+    echo "Test PASSED"
+else
+    echo "Test FAILED"
+ 	nerrors="`expr $nerrors + 1`"
+fi
+#
+#
+if test $nerrors -eq 0 ; then
+    echo "All tests for abort failure passed."
+    exit 0
+else
+    echo "Tests for abort failure failed with $nerrors errors."
+    exit 1
+fi
diff --git a/test/testfiles/plist_files/def_fapl_32be b/test/testfiles/plist_files/def_fapl_32be
index 6e94011..53ef572 100644
--- a/test/testfiles/plist_files/def_fapl_32be
+++ b/test/testfiles/plist_files/def_fapl_32be
diff --git a/test/testfiles/plist_files/def_fapl_32le b/test/testfiles/plist_files/def_fapl_32le
index 6e94011..53ef572 100644
--- a/test/testfiles/plist_files/def_fapl_32le
+++ b/test/testfiles/plist_files/def_fapl_32le
diff --git a/test/testfiles/plist_files/def_fapl_64be b/test/testfiles/plist_files/def_fapl_64be
index 6e94011..53ef572 100644
--- a/test/testfiles/plist_files/def_fapl_64be
+++ b/test/testfiles/plist_files/def_fapl_64be
diff --git a/test/testfiles/plist_files/def_fapl_64le b/test/testfiles/plist_files/def_fapl_64le
index 6e94011..53ef572 100644
--- a/test/testfiles/plist_files/def_fapl_64le
+++ b/test/testfiles/plist_files/def_fapl_64le
diff --git a/test/testfiles/plist_files/fapl_32be b/test/testfiles/plist_files/fapl_32be
index 237b291..d89a44c 100644
--- a/test/testfiles/plist_files/fapl_32be
+++ b/test/testfiles/plist_files/fapl_32be
diff --git a/test/testfiles/plist_files/fapl_32le b/test/testfiles/plist_files/fapl_32le
index 237b291..d89a44c 100644
--- a/test/testfiles/plist_files/fapl_32le
+++ b/test/testfiles/plist_files/fapl_32le
diff --git a/test/testfiles/plist_files/fapl_64be b/test/testfiles/plist_files/fapl_64be
index 237b291..d89a44c 100644
--- a/test/testfiles/plist_files/fapl_64be
+++ b/test/testfiles/plist_files/fapl_64be
diff --git a/test/testfiles/plist_files/fapl_64le b/test/testfiles/plist_files/fapl_64le
index 237b291..d89a44c 100644
--- a/test/testfiles/plist_files/fapl_64le
+++ b/test/testfiles/plist_files/fapl_64le
diff --git a/test/testfiles/plist_files/lapl_32be b/test/testfiles/plist_files/lapl_32be
index 9d81759..eee238e 100644
--- a/test/testfiles/plist_files/lapl_32be
+++ b/test/testfiles/plist_files/lapl_32be
diff --git a/test/testfiles/plist_files/lapl_32le b/test/testfiles/plist_files/lapl_32le
index 9d81759..eee238e 100644
--- a/test/testfiles/plist_files/lapl_32le
+++ b/test/testfiles/plist_files/lapl_32le
diff --git a/test/testfiles/plist_files/lapl_64be b/test/testfiles/plist_files/lapl_64be
index 9d81759..eee238e 100644
--- a/test/testfiles/plist_files/lapl_64be
+++ b/test/testfiles/plist_files/lapl_64be
diff --git a/test/testfiles/plist_files/lapl_64le b/test/testfiles/plist_files/lapl_64le
index 9d81759..eee238e 100644
--- a/test/testfiles/plist_files/lapl_64le
+++ b/test/testfiles/plist_files/lapl_64le
diff --git a/test/tfile.c b/test/tfile.c
index e342da0..c5e913c 100644
--- a/test/tfile.c
+++ b/test/tfile.c
@@ -1430,7 +1430,6 @@ test_obj_count_and_id(hid_t fid1, hid_t fid2, hid_t did, hid_t gid1,
                     case H5I_DATATYPE:
                     case H5I_DATASPACE:
                     case H5I_ATTR:
-                    case H5I_REFERENCE:
                     case H5I_VFL:
                     case H5I_VOL:
                     case H5I_GENPROP_CLS:
@@ -1596,16 +1595,18 @@ test_file_perm2(void)
 **
 *****************************************************************/
 static void
-test_file_is_accessible(void)
+test_file_is_accessible(const char *env_h5_drvr)
 {
     hid_t    fid;               /* File opened with read-write permission */
     hid_t    fcpl_id;           /* File creation property list */
     hid_t    fapl = -1;         /* File access property list */
     int      fd;                /* POSIX file descriptor */
+    char filename[FILENAME_LEN]; /* Filename to use */
     ssize_t  nbytes;            /* Number of bytes written */
     unsigned u;                 /* Local index variable */
     unsigned char buf[1024];    /* Buffer of data to write */
     htri_t   status;            /* Whether a file is an HDF5 file */
+    hbool_t  single_file_vfd;   /* Whether VFD used is a single file */
     herr_t   ret;
 
     /* Output message about test being performed */
@@ -1614,9 +1615,10 @@ test_file_is_accessible(void)
     /* Get FAPL */
     fapl = h5_fileaccess();
     CHECK(fapl, FAIL, "H5Pcreate");
+    h5_fixname(FILE1, fapl, filename, sizeof filename);
 
     /* Create a file */
-    fid = H5Fcreate(FILE1, H5F_ACC_TRUNC, H5P_DEFAULT, fapl);
+    fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl);
     CHECK(fid, FAIL, "H5Fcreate");
 
     /* Close file */
@@ -1624,53 +1626,60 @@ test_file_is_accessible(void)
     CHECK(ret, FAIL, "H5Fclose");
 
     /* Verify that the file is an HDF5 file */
-    status = H5Fis_accessible(FILE1, fapl);
+    status = H5Fis_accessible(filename, fapl);
     VERIFY(status, TRUE, "H5Fis_accessible");
 
 
-    /* Create a file creation property list with a non-default user block size */
-    fcpl_id = H5Pcreate(H5P_FILE_CREATE);
-    CHECK(fcpl_id, FAIL, "H5Pcreate");
+    /* This test is not currently working for the family VFD */
+    if(0 != HDstrcmp(env_h5_drvr, "family")) {
+        /* Create a file creation property list with a non-default user block size */
+        fcpl_id = H5Pcreate(H5P_FILE_CREATE);
+        CHECK(fcpl_id, FAIL, "H5Pcreate");
 
-    ret = H5Pset_userblock(fcpl_id, (hsize_t)2048);
-    CHECK(ret, FAIL, "H5Pset_userblock");
+        ret = H5Pset_userblock(fcpl_id, (hsize_t)2048);
+        CHECK(ret, FAIL, "H5Pset_userblock");
 
-    /* Create file with non-default user block */
-    fid = H5Fcreate(FILE1, H5F_ACC_TRUNC, fcpl_id, fapl);
-    CHECK(fid, FAIL, "H5Fcreate");
+        /* Create file with non-default user block */
+        fid = H5Fcreate(filename, H5F_ACC_TRUNC, fcpl_id, fapl);
+        CHECK(fid, FAIL, "H5Fcreate");
 
-    /* Release file-creation property list */
-    ret = H5Pclose(fcpl_id);
-    CHECK(ret, FAIL, "H5Pclose");
+        /* Release file-creation property list */
+        ret = H5Pclose(fcpl_id);
+        CHECK(ret, FAIL, "H5Pclose");
 
-    /* Close file */
-    ret = H5Fclose(fid);
-    CHECK(ret, FAIL, "H5Fclose");
+        /* Close file */
+        ret = H5Fclose(fid);
+        CHECK(ret, FAIL, "H5Fclose");
 
-    /* Verify that the file is an HDF5 file */
-    status = H5Fis_accessible(FILE1, fapl);
-    VERIFY(status, TRUE, "H5Fis_accessible");
+        /* Verify that the file is an HDF5 file */
+        status = H5Fis_accessible(filename, fapl);
+        VERIFY(status, TRUE, "H5Fis_accessible");
+    } /* end if */
 
 
-    /* Create non-HDF5 file and check it */
-    fd = HDopen(FILE1, O_RDWR|O_CREAT|O_TRUNC, H5_POSIX_CREATE_MODE_RW);
-    CHECK(fd, FAIL, "HDopen");
+    /* This test only works for VFDs with a single file */
+    single_file_vfd = (hbool_t)(HDstrcmp(env_h5_drvr, "split") && HDstrcmp(env_h5_drvr, "multi") && HDstrcmp(env_h5_drvr, "family"));
+    if(single_file_vfd) {
+        /* Create non-HDF5 file and check it */
+        fd = HDopen(filename, O_RDWR|O_CREAT|O_TRUNC, H5_POSIX_CREATE_MODE_RW);
+        CHECK(fd, FAIL, "HDopen");
 
-    /* Initialize information to write */
-    for (u=0; u<1024; u++)
-        buf[u]=(unsigned char)u;
+        /* Initialize information to write */
+        for (u=0; u<1024; u++)
+            buf[u]=(unsigned char)u;
 
-    /* Write some information */
-    nbytes = HDwrite(fd, buf, (size_t)1024);
-    VERIFY(nbytes, 1024, "HDwrite");
+        /* Write some information */
+        nbytes = HDwrite(fd, buf, (size_t)1024);
+        VERIFY(nbytes, 1024, "HDwrite");
 
-    /* Close the file */
-    ret = HDclose(fd);
-    CHECK(ret, FAIL, "HDclose");
+        /* Close the file */
+        ret = HDclose(fd);
+        CHECK(ret, FAIL, "HDclose");
 
-    /* Verify that the file is not an HDF5 file */
-    status = H5Fis_accessible(FILE1, fapl);
-    VERIFY(status, FALSE, "H5Fis_accessible");
+        /* Verify that the file is not an HDF5 file */
+        status = H5Fis_accessible(filename, fapl);
+        VERIFY(status, FALSE, "H5Fis_accessible");
+    } /* end if */
 
     /* Close property list */
     ret = H5Pclose(fapl);
@@ -1694,6 +1703,7 @@ test_file_ishdf5(void)
     hid_t    fcpl;      /* File creation property list */
     hid_t    fapl = -1; /* File access property list */
     int      fd;        /* File Descriptor */
+    char filename[FILENAME_LEN]; /* Filename to use */
     ssize_t  nbytes;    /* Number of bytes written */
     unsigned u;         /* Local index variable */
     unsigned char buf[1024];    /* Buffer of data to write */
@@ -1706,9 +1716,10 @@ test_file_ishdf5(void)
     /* Get FAPL */
     fapl = h5_fileaccess();
     CHECK(fapl, FAIL, "H5Pcreate");
+    h5_fixname(FILE1, fapl, filename, sizeof filename);
 
     /* Create a file */
-    file = H5Fcreate(FILE1, H5F_ACC_TRUNC, H5P_DEFAULT, fapl);
+    file = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl);
     CHECK(file, FAIL, "H5Fcreate");
 
     /* Close file */
@@ -1716,7 +1727,7 @@ test_file_ishdf5(void)
     CHECK(ret, FAIL, "H5Fclose");
 
     /* Verify that the file is an HDF5 file */
-    status = H5Fis_hdf5(FILE1);
+    status = H5Fis_hdf5(filename);
     VERIFY(status, TRUE, "H5Fis_hdf5");
 
 
@@ -1728,7 +1739,7 @@ test_file_ishdf5(void)
     CHECK(ret, FAIL, "H5Pset_userblock");
 
     /* Create file with non-default user block */
-    file = H5Fcreate(FILE1, H5F_ACC_TRUNC, fcpl, fapl);
+    file = H5Fcreate(filename, H5F_ACC_TRUNC, fcpl, fapl);
     CHECK(file, FAIL, "H5Fcreate");
 
     /* Release file-creation property list */
@@ -1740,12 +1751,12 @@ test_file_ishdf5(void)
     CHECK(ret, FAIL, "H5Fclose");
 
     /* Verify that the file is an HDF5 file */
-    status = H5Fis_hdf5(FILE1);
+    status = H5Fis_hdf5(filename);
     VERIFY(status, TRUE, "H5Fis_hdf5");
 
 
     /* Create non-HDF5 file and check it */
-    fd = HDopen(FILE1, O_RDWR|O_CREAT|O_TRUNC, H5_POSIX_CREATE_MODE_RW);
+    fd = HDopen(filename, O_RDWR|O_CREAT|O_TRUNC, H5_POSIX_CREATE_MODE_RW);
     CHECK(fd, FAIL, "HDopen");
 
     /* Initialize information to write */
@@ -1761,7 +1772,7 @@ test_file_ishdf5(void)
     CHECK(ret, FAIL, "HDclose");
 
     /* Verify that the file is not an HDF5 file */
-    status = H5Fis_hdf5(FILE1);
+    status = H5Fis_hdf5(filename);
     VERIFY(status, FALSE, "H5Fis_hdf5");
 
     /* Close property list */
@@ -2248,6 +2259,7 @@ test_file_double_file_dataset_open(hbool_t new_format)
     hsize_t max_dims2[2] = {H5S_UNLIMITED, H5S_UNLIMITED};    /* Maximum dimension sizes for v2 B-tree index */
     hsize_t chunks[1] = {2}, chunks2[2] = {4, 5};        /* Chunk dimension sizes */
     hsize_t size;                               /* File size */
+    char filename[FILENAME_LEN];    /* Filename to use */
     const char* data[] = {"String 1", "String 2", "String 3", "String 4", "String 5"};    /* Input Data */
     const char* e_data[] = {"String 1", "String 2", "String 3", "String 4", "String 5", "String 6", "String 7"};    /* Input Data */
     char* buffer[5];                /* Output buffer */
@@ -2264,9 +2276,10 @@ test_file_double_file_dataset_open(hbool_t new_format)
         ret = H5Pset_libver_bounds(fapl, H5F_LIBVER_LATEST, H5F_LIBVER_LATEST);
         CHECK(ret, FAIL, "H5Pset_libver_bounds");
     } /* end if */
+    h5_fixname(FILE1, fapl, filename, sizeof filename);
 
     /* Create the test file */
-    fid1 = H5Fcreate(FILE1, H5F_ACC_TRUNC, H5P_DEFAULT, fapl);
+    fid1 = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl);
     CHECK(fid1, FAIL, "H5Fcreate");
 
     /* Create a chunked dataset with fixed array indexing */
@@ -2348,8 +2361,6 @@ test_file_double_file_dataset_open(hbool_t new_format)
     CHECK(ret, FAIL, "H5Sclose");
     ret = H5Pclose(dcpl);
     CHECK(ret, FAIL, "H5Pclose");
-    ret = H5Pclose(fapl);
-    CHECK(ret, FAIL, "H5Pclose");
     ret = H5Fclose(fid1);
     CHECK(ret, FAIL, "H5Fclose");
 
@@ -2358,7 +2369,7 @@ test_file_double_file_dataset_open(hbool_t new_format)
      */
 
     /* First file open */
-    fid1 = H5Fopen(FILE1, H5F_ACC_RDWR, H5P_DEFAULT);
+    fid1 = H5Fopen(filename, H5F_ACC_RDWR, fapl);
     CHECK(fid1, FAIL, "H5Fopen");
 
     /* First file's dataset open */
@@ -2373,7 +2384,7 @@ test_file_double_file_dataset_open(hbool_t new_format)
     CHECK(ret, FAIL, "H5Dwrite");
 
     /* Second file open */
-    fid2 = H5Fopen(FILE1, H5F_ACC_RDWR, H5P_DEFAULT);
+    fid2 = H5Fopen(filename, H5F_ACC_RDWR, fapl);
     CHECK(fid2, FAIL, "H5Fopen");
 
     /* Second file's dataset open */
@@ -2414,11 +2425,11 @@ test_file_double_file_dataset_open(hbool_t new_format)
      */
 
     /* First file open */
-    fid1 = H5Fopen(FILE1, H5F_ACC_RDONLY, H5P_DEFAULT);
+    fid1 = H5Fopen(filename, H5F_ACC_RDONLY, fapl);
     CHECK(fid1, FAIL, "H5Fopen");
 
     /* Second file open */
-    fid2 = H5Fopen(FILE1, H5F_ACC_RDONLY, H5P_DEFAULT);
+    fid2 = H5Fopen(filename, H5F_ACC_RDONLY, fapl);
     CHECK(fid2, FAIL, "H5Fopen");
 
     /* Second file's dataset open */
@@ -2479,7 +2490,7 @@ test_file_double_file_dataset_open(hbool_t new_format)
      */
 
     /* First file open */
-    fid1 = H5Fopen(FILE1, H5F_ACC_RDONLY, H5P_DEFAULT);
+    fid1 = H5Fopen(filename, H5F_ACC_RDONLY, fapl);
     CHECK(fid1, FAIL, "H5Fopen");
 
     /* First file's dataset open */
@@ -2491,7 +2502,7 @@ test_file_double_file_dataset_open(hbool_t new_format)
     CHECK(size, 0, "H5Dget_storage_size");
 
     /* Second file open */
-    fid2 = H5Fopen(FILE1, H5F_ACC_RDONLY, H5P_DEFAULT);
+    fid2 = H5Fopen(filename, H5F_ACC_RDONLY, fapl);
     CHECK(fid2, FAIL, "H5Fopen");
 
     /* Second file's dataset open */
@@ -2524,7 +2535,7 @@ test_file_double_file_dataset_open(hbool_t new_format)
      *     from second call to H5Dset_extent->...H5D__earray_idx_remove->H5EA_get...H5EA__iblock_protect...H5AC_protect
      */
     /* First file open */
-    fid1 = H5Fopen(FILE1, H5F_ACC_RDWR, H5P_DEFAULT);
+    fid1 = H5Fopen(filename, H5F_ACC_RDWR, fapl);
     CHECK(fid1, FAIL, "H5Fopen");
 
     /* First file's dataset open */
@@ -2543,7 +2554,7 @@ test_file_double_file_dataset_open(hbool_t new_format)
     CHECK(ret, FAIL, "H5Dwrite");
 
     /* Second file open */
-    fid2 = H5Fopen(FILE1, H5F_ACC_RDWR, H5P_DEFAULT);
+    fid2 = H5Fopen(filename, H5F_ACC_RDWR, fapl);
     CHECK(fid2, FAIL, "H5Fopen");
 
     /* Second file's dataset open */
@@ -2574,6 +2585,9 @@ test_file_double_file_dataset_open(hbool_t new_format)
     ret = H5Tclose(tid1);
     CHECK(ret, FAIL, "H5Tclose");
 
+    /* Close FAPL */
+    ret = H5Pclose(fapl);
+    CHECK(ret, FAIL, "H5Pclose");
 } /* end test_file_double_dataset_open() */
 
 /****************************************************************
@@ -7142,6 +7156,132 @@ test_incr_filesize(void)
 
 /****************************************************************
 **
+**  test_min_dset_ohdr():
+**    Test API calls to toggle dataset object header minimization.
+**
+**  TODO (as separate function?):
+**    + setting persists between close and (re)open?
+**    + dataset header sizes created while changing value of toggle
+**
+****************************************************************/
+static void
+test_min_dset_ohdr(void)
+{
+    const char basename[]       = "min_dset_ohdr_testfile";
+    char filename[FILENAME_LEN] = "";
+    hid_t      file_id          = -1;
+    hid_t      file2_id         = -1;
+    hbool_t    minimize;
+    herr_t     ret;
+
+    MESSAGE(5, ("Testing dataset object header minimization\n"));
+
+    /*********/
+    /* SETUP */
+    /*********/
+
+    h5_fixname(basename, H5P_DEFAULT, filename, sizeof(filename));
+
+    file_id = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+    CHECK_I(file_id, "H5Fcreate");
+
+    /*********/
+    /* TESTS */
+    /*********/
+
+    /*----------------------------------------
+     * TEST default value
+     */
+    ret = H5Fget_dset_no_attrs_hint(file_id, &minimize);
+    CHECK(ret, FAIL, "H5Fget_dset_no_attrs_hint");
+    VERIFY(minimize, FALSE, "minimize flag");
+
+    /*----------------------------------------
+     * TEST set to TRUE
+     */
+    ret = H5Fset_dset_no_attrs_hint(file_id, TRUE);
+    CHECK(ret, FAIL, "H5Fset_dset_no_attrs_hint");
+
+    ret = H5Fget_dset_no_attrs_hint(file_id, &minimize);
+    CHECK(ret, FAIL, "H5Fget_dset_no_attrs_hint");
+    VERIFY(minimize, TRUE, "minimize flag");
+
+    /*----------------------------------------
+     * TEST second file open on same filename
+     */
+    file2_id = H5Fopen(filename, H5F_ACC_RDWR, H5P_DEFAULT);
+    CHECK_I(file2_id, "H5Fopen");
+
+    /* verify TRUE setting on second open
+     */
+    ret = H5Fget_dset_no_attrs_hint(file_id, &minimize);
+    CHECK(ret, FAIL, "H5Fget_dset_no_attrs_hint");
+    VERIFY(minimize, TRUE, "minimize flag");
+
+    /* re-set to FALSE on first open
+     */
+    ret = H5Fset_dset_no_attrs_hint(file_id, FALSE);
+    CHECK(ret, FAIL, "H5Fset_dset_no_attrs_hint");
+
+    /* verify FALSE set on both opens
+     */
+    ret = H5Fget_dset_no_attrs_hint(file_id, &minimize);
+    CHECK(ret, FAIL, "H5Fget_dset_no_attrs_hint");
+    VERIFY(minimize, FALSE, "minimize flag");
+
+    ret = H5Fget_dset_no_attrs_hint(file2_id, &minimize);
+    CHECK(ret, FAIL, "H5Fget_dset_no_attrs_hint");
+    VERIFY(minimize, FALSE, "minimize flag");
+
+    /* re-set to TRUE on second open
+     */
+    ret = H5Fset_dset_no_attrs_hint(file2_id, TRUE);
+    CHECK(ret, FAIL, "H5Fset_dset_no_attrs_hint");
+
+    /* verify TRUE set on both opens
+     */
+    ret = H5Fget_dset_no_attrs_hint(file_id, &minimize);
+    CHECK(ret, FAIL, "H5Fget_dset_no_attrs_hint");
+    VERIFY(minimize, TRUE, "minimize flag");
+
+    ret = H5Fget_dset_no_attrs_hint(file2_id, &minimize);
+    CHECK(ret, FAIL, "H5Fget_dset_no_attrs_hint");
+    VERIFY(minimize, TRUE, "minimize flag");
+
+    /*----------------------------------------
+     * TEST error cases
+     */
+
+    /* trying to set with invalid file ID */
+    H5E_BEGIN_TRY {
+        ret = H5Fset_dset_no_attrs_hint(-1, TRUE);
+    } H5E_END_TRY;
+    VERIFY(ret, FAIL, "H5Fset_dset_no_attrs_hint");
+
+    /* trying to get with invalid file ID */
+    H5E_BEGIN_TRY {
+        ret = H5Fget_dset_no_attrs_hint(-1, &minimize);
+    } H5E_END_TRY;
+    VERIFY(ret, FAIL, "H5Fget_dset_no_attrs_hint");
+
+    /* trying to get with invalid pointer */
+    H5E_BEGIN_TRY {
+        ret = H5Fget_dset_no_attrs_hint(file_id, NULL);
+    } H5E_END_TRY;
+    VERIFY(ret, FAIL, "H5Fget_dset_no_attrs_hint");
+
+    /************/
+    /* TEARDOWN */
+    /************/
+
+    ret = H5Fclose(file_id);
+    CHECK(ret, FAIL, "H5Fclose");
+    ret = H5Fclose(file2_id);
+    CHECK(ret, FAIL, "H5Fclose");
+} /* end test_min_dset_ohdr() */
+
+/****************************************************************
+**
 **  test_deprec():
 **    Test deprecated functionality.
 **
@@ -7375,6 +7515,7 @@ test_deprec(void)
 void
 test_file(void)
 {
+    hbool_t  single_file_vfd;   /* Whether VFD used is a single file */
     const char  *env_h5_drvr;         /* File Driver value from environment */
 
     /* Output message about test being performed */
@@ -7384,6 +7525,7 @@ test_file(void)
     env_h5_drvr = HDgetenv("HDF5_DRIVER");
     if(env_h5_drvr == NULL)
         env_h5_drvr = "nomatch";
+    single_file_vfd = (hbool_t)(HDstrcmp(env_h5_drvr, "split") && HDstrcmp(env_h5_drvr, "multi") && HDstrcmp(env_h5_drvr, "family"));
 
     test_file_create();                         /* Test file creation(also creation templates)*/
     test_file_open();                           /* Test file opening */
@@ -7393,7 +7535,7 @@ test_file(void)
     test_get_obj_ids();                         /* Test H5Fget_obj_ids for Jira Issue 8528 */
     test_file_perm();                           /* Test file access permissions */
     test_file_perm2();                          /* Test file access permission again */
-    test_file_is_accessible();                  /* Test detecting HDF5 files correctly */
+    test_file_is_accessible(env_h5_drvr);       /* Test detecting HDF5 files correctly */
     test_file_open_dot();                       /* Test opening objects with "." for a name */
     test_file_open_overlap();                   /* Test opening files in an overlapping manner */
     test_file_getname();                        /* Test basic H5Fget_name() functionality */
@@ -7427,8 +7569,12 @@ test_file(void)
     test_libver_macros();                       /* Test the macros for library version comparison */
     test_libver_macros2();                      /* Test the macros for library version comparison */
     test_incr_filesize();                       /* Test H5Fincrement_filesize() and H5Fget_eoa() */
+    test_min_dset_ohdr();                       /* Test datset object header minimization */
 #ifndef H5_NO_DEPRECATED_SYMBOLS
-    test_file_ishdf5();                         /* Test detecting HDF5 files correctly */
+    if(single_file_vfd)
+        test_file_ishdf5();                         /* Test detecting HDF5 files correctly */
+    else
+        MESSAGE(5, ("Skipping testing detection of HDF5 Files (using deprecated H5Fis_hdf5() call for non-single file VFDs)\n"));
     test_deprec();                              /* Test deprecated routines */
 #endif /* H5_NO_DEPRECATED_SYMBOLS */
 } /* test_file() */
diff --git a/test/tselect.c b/test/tselect.c
index 3c93e7a..bcc2a5b 100644
--- a/test/tselect.c
+++ b/test/tselect.c
@@ -1308,14 +1308,8 @@ test_select_hyper_contig(hid_t dset_type, hid_t xfer_plist)
     CHECK(ret, FAIL, "H5Dread");
 
     /* Compare data read with data written out */
-    if(HDmemcmp(rbuf, wbuf, sizeof(uint16_t) * 30 * 12)) {
+    if(HDmemcmp(rbuf, wbuf, sizeof(uint16_t) * 30 * 12))
         TestErrPrintf("hyperslab values don't match! Line=%d\n",__LINE__);
-#ifdef QAK
-        for(i=0, tbuf=wbuf; i<12; i++)
-            for(j=0; j<30; j++)
-                printf("i=%d, j=%d, *wbuf=%u, *rbuf=%u\n",i,j,(unsigned)*(wbuf+i*30+j),(unsigned)*(rbuf+i*30+j));
-#endif /* QAK */
-    } /* end if */
 
     /* Close memory dataspace */
     ret = H5Sclose(sid2);
@@ -1432,14 +1426,8 @@ test_select_hyper_contig2(hid_t dset_type, hid_t xfer_plist)
     CHECK(ret, FAIL, "H5Dread");
 
     /* Compare data read with data written out */
-    if(HDmemcmp(rbuf,wbuf,sizeof(uint16_t)*2*SPACE8_DIM3*SPACE8_DIM2*SPACE8_DIM1)) {
+    if(HDmemcmp(rbuf,wbuf,sizeof(uint16_t)*2*SPACE8_DIM3*SPACE8_DIM2*SPACE8_DIM1))
         TestErrPrintf("Error: hyperslab values don't match!\n");
-#ifdef QAK
-        for(i=0, tbuf=wbuf; i<12; i++)
-            for(j=0; j<30; j++)
-                printf("i=%d, j=%d, *wbuf=%u, *rbuf=%u\n",i,j,(unsigned)*(wbuf+i*30+j),(unsigned)*(rbuf+i*30+j));
-#endif /* QAK */
-    } /* end if */
 
     /* Close memory dataspace */
     ret = H5Sclose(sid2);
@@ -3743,15 +3731,8 @@ test_select_hyper_copy(void)
     CHECK(ret, FAIL, "H5Dread");
 
     /* Compare data read with data written out */
-    if(HDmemcmp(rbuf,rbuf2,sizeof(uint16_t)*SPACE3_DIM1*SPACE3_DIM2)) {
+    if(HDmemcmp(rbuf,rbuf2,sizeof(uint16_t)*SPACE3_DIM1*SPACE3_DIM2))
         TestErrPrintf("hyperslab values don't match! Line=%d\n",__LINE__);
-#ifdef QAK
-        for(i=0; i<SPACE3_DIM1; i++)
-            for(j=0; j<SPACE3_DIM2; j++)
-                if((unsigned)*(rbuf+i*SPACE3_DIM2+j)!=(unsigned)*(rbuf2+i*SPACE3_DIM2+j))
-                    printf("i=%d, j=%d, *rbuf=%u, *rbuf2=%u\n",i,j,(unsigned)*(rbuf+i*SPACE3_DIM2+j),(unsigned)*(rbuf2+i*SPACE3_DIM2+j));
-#endif /* QAK */
-    } /* end if */
 
     /* Close memory dataspace */
     ret = H5Sclose(sid2);
@@ -5220,7 +5201,7 @@ test_select_hyper_union_3d(void)
     tmp2_space = H5Scombine_select(sid2,H5S_SELECT_OR,tmp_space);
     CHECK(tmp2_space, FAIL, "H5Scombin_select");
 
-    npoints = H5Sget_select_npoints(tmp2_space);
+    npoints = (hsize_t)H5Sget_select_npoints(tmp2_space);
     VERIFY(npoints, 15*26, "H5Sget_select_npoints");
 
     /* Create a dataset */
@@ -5902,37 +5883,20 @@ test_select_hyper_union_random_5d(hid_t read_plist)
     CHECK(sid2, FAIL, "H5Screate_simple");
 
     /* Get initial random # seed */
-    seed=(unsigned)time(NULL)+(unsigned)clock();
+    seed = (unsigned)HDtime(NULL) + (unsigned)HDclock();
 
     /* Crunch through a bunch of random hyperslab reads from the file dataset */
     for(test_num=0; test_num<NRAND_HYPER; test_num++) {
         /* Save random # seed for later use */
         /* (Used in case of errors, to regenerate the hyperslab sequence) */
-#ifndef QAK
-        seed+=(unsigned)clock();
-#else /* QAK */
-        seed=987909620;
-#endif /* QAK */
+        seed += (unsigned)HDclock();
         HDsrandom(seed);
 
-#ifdef QAK
-printf("test_num=%d, seed=%u\n",test_num,seed);
-#endif /* QAK */
-#ifndef QAK
         for(i=0; i<NHYPERSLABS; i++) {
-#else /* QAK */
-        for(i=0; i<2; i++) {
-#endif /* QAK */
-#ifdef QAK
-printf("hyperslab=%d\n",i);
-#endif /* QAK */
             /* Select random hyperslab location & size for selection */
             for(j=0; j<SPACE5_RANK; j++) {
                 start[j] = ((hsize_t)HDrandom() % dims1[j]);
                 count[j] = (((hsize_t)HDrandom() % (dims1[j] - start[j])) + 1);
-#ifdef QAK
-printf("start[%d]=%d, count[%d]=%d (end[%d]=%d)\n",j,(int)start[j],j,(int)count[j],j,(int)(start[j]+count[j]-1));
-#endif /* QAK */
             } /* end for */
 
             /* Select hyperslab */
@@ -5953,41 +5917,9 @@ printf("start[%d]=%d, count[%d]=%d (end[%d]=%d)\n",j,(int)start[j],j,(int)count[
         npoints2 = H5Sget_select_npoints(sid2);
         VERIFY(npoints, npoints2, "H5Sget_select_npoints");
 
-#ifdef QAK
-printf("random I/O, before H5Dread(), npoints=%lu\n",(unsigned long)npoints);
-{
-    hsize_t blocks[128][2][SPACE5_RANK];
-    hssize_t nblocks;
-    int k;
-
-    nblocks=H5Sget_select_hyper_nblocks(sid1);
-    printf("nblocks=%d\n",(int)nblocks);
-    H5Sget_select_hyper_blocklist(sid1,0,nblocks,blocks);
-    for(j=0; j<nblocks; j++) {
-        printf("Block #%d, start = {",j);
-        for(k=0; k<SPACE5_RANK; k++) {
-            printf("%d",blocks[j][0][k]);
-            if(k<(SPACE5_RANK-1))
-                printf(", ");
-            else
-                printf("}, end = {");
-        } /* end for */
-        for(k=0; k<SPACE5_RANK; k++) {
-            printf("%d",blocks[j][1][k]);
-            if(k<(SPACE5_RANK-1))
-                printf(", ");
-            else
-                printf("}\n");
-        } /* end for */
-    } /* end for */
-}
-#endif /* QAK */
         /* Read selection from disk */
         ret=H5Dread(dataset,H5T_NATIVE_INT,sid2,sid1,read_plist,rbuf);
         CHECK(ret, FAIL, "H5Dread");
-#ifdef QAK
-printf("random I/O, after H5Dread()\n");
-#endif /* QAK */
 
         /* Compare data read with data written out */
         tbuf=rbuf;
diff --git a/test/tsohm.c b/test/tsohm.c
index 718b12f..bd73d00 100644
--- a/test/tsohm.c
+++ b/test/tsohm.c
@@ -13,7 +13,7 @@
 
 /***********************************************************
 *
-* Test program:	 tsohm
+* Test program: tsohm
 *
 * Test Shared Object Header Messages
 *
@@ -25,9 +25,9 @@
  * This file needs to access private information from the H5F package.
  * This file also needs to access the file testing code.
  */
-#define H5F_FRIEND		/*suppress error about including H5Fpkg	  */
+#define H5F_FRIEND   /* suppress error about including H5Fpkg      */
 #define H5F_TESTING
-#include "H5Fpkg.h"		/* File access	 			*/
+#include "H5Fpkg.h"  /* File access */
 
 /* Default SOHM values */
 #define DEF_NUM_INDEXES 0
@@ -178,40 +178,39 @@ static void test_sohm_extlink(void);
 
 /****************************************************************
 **
-**  check_fcpl_values(): Helper function for test_sohm_fcpl.
-**         Verifies that the *_in and *_out parameters are equal.
+**  verify_fcpl_values(): Verifies that FCPL is set as expected.
 **
 ****************************************************************/
-static void check_fcpl_values(hid_t fcpl_id, const unsigned nindexes_in,
-                const unsigned *flags_in, const unsigned *minsizes_in,
-                unsigned l2b, unsigned b2l)
+static void
+verify_fcpl_values(hid_t fcpl_id, const unsigned nindexes_expected, const unsigned *flags_expected, const unsigned *minsizes_expected, unsigned l2b, unsigned b2l)
 {
-    unsigned    num_indexes;
-    unsigned    index_flags, min_mesg_size;
-    unsigned    list_size, btree_size;
-    unsigned     x;
-    herr_t      ret;
-
-    /* Verify number of indexes is set to default */
-    ret = H5Pget_shared_mesg_nindexes(fcpl_id, &num_indexes);
+    unsigned  nindexes_actual;
+    unsigned  list_size;
+    unsigned  btree_size;
+    unsigned  x;
+    herr_t    ret;
+
+    /* Number of indexes */
+    ret = H5Pget_shared_mesg_nindexes(fcpl_id, &nindexes_actual);
     CHECK_I(ret, "H5Pget_shared_mesg_nindexes");
-    VERIFY(num_indexes, nindexes_in, "H5Pget_shared_mesg_nindexes");
+    VERIFY(nindexes_actual, nindexes_expected, "H5Pget_shared_mesg_nindexes");
 
-    /* Verify index flags and minsizes are set */
-    for(x=0; x<num_indexes; ++x)
-    {
-        ret = H5Pget_shared_mesg_index(fcpl_id, x, &index_flags, &min_mesg_size);
+    /* Index flags and minsizes */
+    for(x=0; x<nindexes_actual; ++x) {
+        unsigned flags_i;
+        unsigned min_mesg_size;
+        ret = H5Pget_shared_mesg_index(fcpl_id, x, &flags_i, &min_mesg_size);
         CHECK_I(ret, "H5Pget_shared_mesg_index");
-        VERIFY(index_flags, flags_in[x], "H5Pget_shared_mesg_index");
-        VERIFY(min_mesg_size, minsizes_in[x], "H5Pget_shared_mesg_index");
+        VERIFY(flags_i, flags_expected[x], "H5Pget_shared_mesg_index");
+        VERIFY(min_mesg_size, minsizes_expected[x], "H5Pget_shared_mesg_index");
     }
 
-    /* Check list-to-btree and btree-to-list values */
+    /* List-to-btree and btree-to-list values */
     ret = H5Pget_shared_mesg_phase_change(fcpl_id, &list_size, &btree_size);
     CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
     VERIFY(list_size, l2b, "H5Pset_shared_mesg_phase_change");
     VERIFY(btree_size, b2l, "H5Pset_shared_mesg_phase_change");
-}
+} /* verify_fcpl_values */
 
 
 /****************************************************************
@@ -219,22 +218,21 @@ static void check_fcpl_values(hid_t fcpl_id, const unsigned nindexes_in,
 **  test_sohm_fcpl(): Test File Creation Property Lists.
 **
 ****************************************************************/
-static void test_sohm_fcpl(void)
+static void
+test_sohm_fcpl(void)
 {
-    hid_t       fid = -1;
-    hid_t       fcpl_id = -1;
-    hid_t       fcpl2_id = -1;
-    unsigned    x;
-    herr_t	ret;		/* Generic return value	*/
+    hid_t    fid = -1;
+    hid_t    fcpl_id = -1;
+    hid_t    fcpl2_id = -1;
+    unsigned x;
+    herr_t   ret;
 
-    /* Output message about test being performed */
     MESSAGE(5, ("Testing File Creation Properties for Shared Messages\n"));
 
     fcpl_id = H5Pcreate(H5P_FILE_CREATE);
     CHECK_I(fcpl_id, "H5Pcreate");
 
-    /* Verify fcpl values */
-    check_fcpl_values(fcpl_id, DEF_NUM_INDEXES, def_type_flags, def_minsizes, DEF_L2B, DEF_B2L);
+    verify_fcpl_values(fcpl_id, DEF_NUM_INDEXES, def_type_flags, def_minsizes, DEF_L2B, DEF_B2L);
 
     /* Create a file with this fcpl and make sure that all the values can be
      * retrieved.
@@ -245,8 +243,7 @@ static void test_sohm_fcpl(void)
     fcpl2_id = H5Fget_create_plist(fid);
     CHECK_I(fcpl2_id, "H5Fcreate");
 
-    /* Verify fcpl values */
-    check_fcpl_values(fcpl2_id, DEF_NUM_INDEXES, def_type_flags, def_minsizes, DEF_L2B, DEF_B2L);
+    verify_fcpl_values(fcpl2_id, DEF_NUM_INDEXES, def_type_flags, def_minsizes, DEF_L2B, DEF_B2L);
 
     ret = H5Pclose(fcpl2_id);
     CHECK_I(ret, "H5Pclose");
@@ -262,8 +259,7 @@ static void test_sohm_fcpl(void)
     fcpl2_id = H5Fget_create_plist(fid);
     CHECK_I(ret, "H5Fcreate");
 
-    /* Verify fcpl values */
-    check_fcpl_values(fcpl2_id, DEF_NUM_INDEXES, def_type_flags, def_minsizes, DEF_L2B, DEF_B2L);
+    verify_fcpl_values(fcpl2_id, DEF_NUM_INDEXES, def_type_flags, def_minsizes, DEF_L2B, DEF_B2L);
 
     /* Clean up */
     ret = H5Pclose(fcpl2_id);
@@ -289,7 +285,7 @@ static void test_sohm_fcpl(void)
     ret = H5Pset_shared_mesg_phase_change(fcpl_id, TEST_L2B, TEST_B2L);
     CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
 
-    check_fcpl_values(fcpl_id, TEST_NUM_INDEXES, test_type_flags, test_minsizes, TEST_L2B, TEST_B2L);
+    verify_fcpl_values(fcpl_id, TEST_NUM_INDEXES, test_type_flags, test_minsizes, TEST_L2B, TEST_B2L);
 
     /* Use the fcpl to create a file and get it back again */
     fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, H5P_DEFAULT);
@@ -297,8 +293,7 @@ static void test_sohm_fcpl(void)
     fcpl2_id = H5Fget_create_plist(fid);
     CHECK_I(fcpl2_id, "H5Fcreate");
 
-    /* Verify fcpl values */
-    check_fcpl_values(fcpl2_id, TEST_NUM_INDEXES, test_type_flags, test_minsizes, TEST_L2B, TEST_B2L);
+    verify_fcpl_values(fcpl2_id, TEST_NUM_INDEXES, test_type_flags, test_minsizes, TEST_L2B, TEST_B2L);
 
     ret = H5Pclose(fcpl2_id);
     CHECK_I(ret, "H5Pclose");
@@ -314,8 +309,7 @@ static void test_sohm_fcpl(void)
     fcpl2_id = H5Fget_create_plist(fid);
     CHECK_I(ret, "H5Fcreate");
 
-    /* Verify fcpl values */
-    check_fcpl_values(fcpl2_id, TEST_NUM_INDEXES, test_type_flags, test_minsizes, TEST_L2B, TEST_B2L);
+    verify_fcpl_values(fcpl2_id, TEST_NUM_INDEXES, test_type_flags, test_minsizes, TEST_L2B, TEST_B2L);
 
     /* Clean up */
     ret = H5Pclose(fcpl2_id);
@@ -323,7 +317,70 @@ static void test_sohm_fcpl(void)
     ret = H5Fclose(fid);
     CHECK_I(ret, "H5Fclose");
 
-    /* Test giving bogus values to H5P* functions */
+    /* Actually, the list max can be exactly 1 greater than the
+     * btree min, but no more.
+     * Reset the second index.
+     */
+    ret = H5Pset_shared_mesg_index(fcpl_id, 1, test_type_flags[1], 15);
+    CHECK_I(ret, "H5Pset_shared_mesg_index");
+    ret = H5Pset_shared_mesg_phase_change(fcpl_id, 10, 11);
+    CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
+    fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, H5P_DEFAULT);
+    CHECK_I(fid, "H5Fcreate");
+    ret = H5Fclose(fid);
+    CHECK_I(ret, "H5Fclose");
+
+    /* Test edge cases:
+     * H5O_SHMESG_MAX_NINDEXES and H5O_SHMESG_MAX_LIST_SIZE should be valid
+     * values.
+     * Creating a file with uninitialized indexes should work. (TODO: not implemented?)
+     */
+    ret = H5Pset_shared_mesg_nindexes(fcpl_id, H5O_SHMESG_MAX_NINDEXES);
+    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+    ret = H5Pset_shared_mesg_phase_change(fcpl_id, H5O_SHMESG_MAX_LIST_SIZE, H5O_SHMESG_MAX_LIST_SIZE);
+    CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
+    fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, H5P_DEFAULT);
+    CHECK_I(fid, "H5Fcreate");
+
+    /* Clean up */
+    ret = H5Pclose(fcpl_id);
+    CHECK_I(ret, "H5Pclose");
+    ret = H5Fclose(fid);
+    CHECK_I(ret, "H5Fclose");
+} /* test_sohm_fcpl */
+
+
+/****************************************************************
+**
+**  test_sohm_fcpl_errors(): Test bogus FCPL settings for SOHMs
+**
+****************************************************************/
+static void
+test_sohm_fcpl_errors(void)
+{
+    hid_t    fcpl_id = -1;
+    hid_t    fid     = -1;
+    unsigned x;
+    herr_t   ret;
+
+    MESSAGE(5, ("Testing bogus file creation properties for shared messages\n"));
+
+    fcpl_id = H5Pcreate(H5P_FILE_CREATE);
+    CHECK_I(fcpl_id, "H5Pcreate");
+
+    /* Set up index values */
+    ret = H5Pset_shared_mesg_nindexes(fcpl_id, TEST_NUM_INDEXES);
+    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+    for(x = 0; x < TEST_NUM_INDEXES; ++x) {
+        ret = H5Pset_shared_mesg_index(fcpl_id, x, test_type_flags[x], test_minsizes[x]);
+        CHECK_I(ret, "H5Pset_shared_mesg_index");
+    }
+
+    ret = H5Pset_shared_mesg_phase_change(fcpl_id, TEST_L2B, TEST_B2L);
+    CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
+
+    verify_fcpl_values(fcpl_id, TEST_NUM_INDEXES, test_type_flags, test_minsizes, TEST_L2B, TEST_B2L);
+
     H5E_BEGIN_TRY {
         /* Trying to create too many indexes should fail */
         ret = H5Pset_shared_mesg_nindexes(fcpl_id, H5O_SHMESG_MAX_NINDEXES + 1);
@@ -370,40 +427,7 @@ static void test_sohm_fcpl(void)
         ret = H5Pset_shared_mesg_phase_change(fcpl_id, H5O_SHMESG_MAX_LIST_SIZE, H5O_SHMESG_MAX_LIST_SIZE+1);
         VERIFY(ret, -1, "H5Pset_shared_mesg_phase_change");
     } H5E_END_TRY
-
-
-    /* Actually, the list max can be exactly 1 greater than the
-     * btree min, but no more.  Also, the errors above shouldn't
-     * have corrupted the fcpl, although we do need to reset the
-     * second index that we changed above.
-     */
-    ret = H5Pset_shared_mesg_index(fcpl_id, 1, test_type_flags[1], 15);
-    CHECK_I(ret, "H5Pset_shared_mesg_index");
-    ret = H5Pset_shared_mesg_phase_change(fcpl_id, 10, 11);
-    CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
-    fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, H5P_DEFAULT);
-    CHECK_I(fid, "H5Fcreate");
-    ret = H5Fclose(fid);
-    CHECK_I(ret, "H5Fclose");
-
-    /* Test edge cases; H5O_SHMESG_MAX_NINDEXES and H5O_SHMESG_MAX_LIST_SIZE should be
-     * valid values.  Also, creating a file with uninitialized indexes
-     * (indexes 3-5) should work.
-     */
-    ret = H5Pset_shared_mesg_nindexes(fcpl_id, H5O_SHMESG_MAX_NINDEXES);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
-    ret = H5Pset_shared_mesg_phase_change(fcpl_id, H5O_SHMESG_MAX_LIST_SIZE, H5O_SHMESG_MAX_LIST_SIZE);
-    CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
-    fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, H5P_DEFAULT);
-    CHECK_I(fid, "H5Fcreate");
-
-
-    /* Clean up */
-    ret = H5Pclose(fcpl_id);
-    CHECK_I(ret, "H5Pclose");
-    ret = H5Fclose(fid);
-    CHECK_I(ret, "H5Fclose");
-}
+} /* test_sohm_fcpl_errors */
 
 
 /*-------------------------------------------------------------------------
@@ -455,7 +479,8 @@ error:
       H5Tclose(dtype1_id);
     } H5E_END_TRY
     return -1;
-}
+} /* make_dtype1 */
+
 
 /*-------------------------------------------------------------------------
  * Function:    make_dtype_2
@@ -518,9 +543,9 @@ error:
       H5Tclose(int_id);
     } H5E_END_TRY
     return -1;
-}
-
+} /* make_dtype2 */
 
+
 /*-------------------------------------------------------------------------
  * Function:    close_reopen_file
  *
@@ -540,16 +565,16 @@ error:
 static hid_t
 close_reopen_file(hid_t file, const char* filename, hid_t fapl_id)
 {
-    hid_t fid;
-
-    if(H5Fclose(file) < 0) FAIL_STACK_ERROR
-    if((fid = H5Fopen(filename, H5F_ACC_RDWR, fapl_id)) < 0) FAIL_STACK_ERROR
-
-    return(fid);
+    if (H5Fclose(file) < 0)
+        FAIL_STACK_ERROR
+    file = H5Fopen(filename, H5F_ACC_RDWR, fapl_id);
+    if (file < 0)
+        FAIL_STACK_ERROR
+    return(file);
 
 error:
     return -1;
-}
+} /* close_reopen_file */
 
 
 /*-------------------------------------------------------------------------
@@ -557,7 +582,6 @@ error:
  *
  * Purpose:     Creates object headers that use a large datatype message.
  *
- *              Used in test_sohm_basic.  Should close the file ID passed in.
  *              Set test_file_closing to 1 to add file closing and reopening
  *              whenever possible (to test that SOHMs are written correctly
  *              on disk and not just in memory).
@@ -571,7 +595,7 @@ error:
  *-------------------------------------------------------------------------
  */
 static hid_t
-size1_helper(hid_t file, const char* filename, hid_t fapl_id, int test_file_closing)
+size1_helper(hid_t file, const char *filename, hid_t fapl_id, int test_file_closing)
 {
     dtype1_struct wdata;
     dtype1_struct rdata;
@@ -581,6 +605,32 @@ size1_helper(hid_t file, const char* filename, hid_t fapl_id, int test_file_clos
     hsize_t     dim1[1];
     int         x;
 
+/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+ * Macro:      TSOHM_S1H_VERIFY_DATA
+ *
+ * Purpose:    Encapsulate a common pattern:
+ *             Reads the dataset and verifies that [a subset of] the data
+ *             are as expected.
+ *
+ * Programmer: Jacob Smith
+ *             2018 November 1
+ * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+ */
+#define TSOHM_S1H_VERIFY_DATA(dset_id, dtype_id) \
+{                                                \
+    HDmemset(&rdata, 0, sizeof(rdata));          \
+    if (0 > H5Dread((dset_id), (dtype_id), H5S_ALL, H5S_ALL, H5P_DEFAULT, &rdata)) { \
+        H5_FAILED(); AT();                       \
+        printf("Can't read data\n");             \
+        goto error;                              \
+    }                                            \
+    if ((rdata.i1 != wdata.i1) || (rdata.i2 != wdata.i2) || HDstrcmp(rdata.str, wdata.str)) { \
+        H5_FAILED(); AT();                       \
+        printf("incorrect read data\n");         \
+        goto error;                              \
+    }                                            \
+} /* TSOHM_S1H_VERIFY_DATA() definition */
+
     /* Closing and re-opening the file takes a long time on systems without
      * local disks.  Don't close and reopen if express testing is enabled.
      */
@@ -603,107 +653,68 @@ size1_helper(hid_t file, const char* filename, hid_t fapl_id, int test_file_clos
     /* Intialize rdata */
     HDmemset(&rdata, 0, sizeof(rdata));
 
-    if((dtype1_id = make_dtype_1()) < 0) TEST_ERROR
+    dtype1_id = make_dtype_1();
+    if(dtype1_id < 0) TEST_ERROR
 
-    /* Create the dataspace and dataset */
     dim1[0] = 1;
-    if((space_id = H5Screate_simple(1, dim1, NULL)) < 0) TEST_ERROR
+    space_id = H5Screate_simple(1, dim1, NULL);
+    if(space_id < 0) TEST_ERROR
 
-    if((dset_id = H5Dcreate2(file, DSETNAME[0], dtype1_id, space_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) FAIL_STACK_ERROR
+    dset_id = H5Dcreate2(file, DSETNAME[0], dtype1_id, space_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    if(dset_id < 0) FAIL_STACK_ERROR
 
     /* Test writing and reading */
     if(H5Dwrite(dset_id, dtype1_id, H5S_ALL, H5S_ALL, H5P_DEFAULT, &wdata) < 0) FAIL_STACK_ERROR
-
-    if(H5Dread(dset_id, dtype1_id, H5S_ALL, H5S_ALL, H5P_DEFAULT, &rdata) < 0) FAIL_STACK_ERROR
-
-    if(rdata.i1 != wdata.i1 || rdata.i2 != wdata.i2 || HDstrcmp(rdata.str, wdata.str)) {
-        H5_FAILED(); AT();
-        printf("incorrect read data\n");
-        goto error;
-    } /* end if */
+    TSOHM_S1H_VERIFY_DATA(dset_id, dtype1_id)
     if(H5Dclose(dset_id) < 0) FAIL_STACK_ERROR
 
-    /* Close and re-open the file if requested*/
     if(test_file_closing)
         if((file = close_reopen_file(file, filename, fapl_id)) < 0) TEST_ERROR
 
-    /* Create more datasets with the same datatype */
-    if((dset_id = H5Dcreate2(file, DSETNAME[1], dtype1_id, space_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) FAIL_STACK_ERROR
-    if(H5Dclose(dset_id) < 0) FAIL_STACK_ERROR
+    /* Create 3 more datasets with the same datatype/dataspace */
+    for (x = 1; x < 4; x++) {
+        dset_id = H5Dcreate2(file, DSETNAME[x], dtype1_id, space_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+        if (0 > dset_id) FAIL_STACK_ERROR
+        if (x == 3)
+            if(H5Dwrite(dset_id, dtype1_id, H5S_ALL, H5S_ALL, H5P_DEFAULT, &wdata) < 0) TEST_ERROR
+        if (H5Dclose(dset_id) < 0) FAIL_STACK_ERROR
 
-    /* Close and re-open the file if requested*/
-    if(test_file_closing)
-        if((file = close_reopen_file(file, filename, fapl_id)) < 0) TEST_ERROR
-
-    if((dset_id = H5Dcreate2(file, DSETNAME[2], dtype1_id, space_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) TEST_ERROR
-    if(H5Dclose(dset_id) < 0) TEST_ERROR
-
-    /* Close and re-open the file if requested*/
-    if(test_file_closing)
-        if((file = close_reopen_file(file, filename, fapl_id)) < 0) TEST_ERROR
-
-    if((dset_id = H5Dcreate2(file,DSETNAME[3],dtype1_id,space_id,H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) TEST_ERROR
-
-    /* Write data to dataset 3 for later */
-    if(H5Dwrite(dset_id, dtype1_id, H5S_ALL, H5S_ALL, H5P_DEFAULT, &wdata) < 0) TEST_ERROR
+        if (test_file_closing)
+            if((file = close_reopen_file(file, filename, fapl_id)) < 0) TEST_ERROR
+    }
 
-    if(H5Dclose(dset_id) < 0) TEST_ERROR
     if(H5Tclose(dtype1_id) < 0) TEST_ERROR
 
-    /* Close and re-open the file if requested*/
-    if(test_file_closing)
-        if((file = close_reopen_file(file, filename, fapl_id)) < 0) TEST_ERROR
-
     /* Make sure the data has been written successfully */
-    if((dset_id = H5Dopen2(file, DSETNAME[0], H5P_DEFAULT)) < 0) TEST_ERROR
-    if((dtype1_id = H5Dget_type(dset_id)) < 0) TEST_ERROR
-
-    /* Read data back again */
-    HDmemset(&rdata, 0, sizeof(rdata));
-    if(H5Dread(dset_id, dtype1_id, H5S_ALL, H5S_ALL, H5P_DEFAULT, &rdata) < 0) {
-        H5_FAILED(); AT();
-        printf("Can't read data\n");
-        goto error;
-    } /* end if */
-
-    if(rdata.i1 != wdata.i1 || rdata.i2 != wdata.i2 || HDstrcmp(rdata.str, wdata.str)) {
-        H5_FAILED(); AT();
-        printf("incorrect read data\n");
-        goto error;
-    } /* end if */
+    dset_id = H5Dopen2(file, DSETNAME[0], H5P_DEFAULT);
+    if(dset_id < 0) TEST_ERROR
+    dtype1_id = H5Dget_type(dset_id);
+    if(dtype1_id < 0) TEST_ERROR
+    TSOHM_S1H_VERIFY_DATA(dset_id, dtype1_id)
 
     if(H5Dclose(dset_id) < 0) TEST_ERROR
 
-    /* Create several copies of the dataset (this increases the amount of space saved by sharing the datatype message) */
+    /* Create several copies of the dataset
+     * this increases the amount of space saved by sharing the datatype message
+     */
     for(x = 0; x < SOHM_HELPER_NUM_EX_DSETS; x++) {
-        if((dset_id = H5Dcreate2(file, EXTRA_DSETNAME[x], dtype1_id, space_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) TEST_ERROR
+        dset_id = H5Dcreate2(file, EXTRA_DSETNAME[x], dtype1_id, space_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+        if(dset_id < 0) TEST_ERROR
         if(H5Dclose(dset_id) < 0) TEST_ERROR
 
-        /* Close and re-open the file if requested*/
         if(test_file_closing)
             if((file = close_reopen_file(file, filename, fapl_id)) < 0) TEST_ERROR
-    } /* end for */
+    }
 
     if(H5Tclose(dtype1_id) < 0) TEST_ERROR
     if(H5Sclose(space_id) < 0) TEST_ERROR
 
     /* Ensure that we can still read data back from dataset 3 */
-    if((dset_id = H5Dopen2(file, DSETNAME[3], H5P_DEFAULT)) < 0) TEST_ERROR
-    if((dtype1_id = H5Dget_type(dset_id)) < 0) TEST_ERROR
-
-    /* Read data back again */
-    HDmemset(&rdata, 0, sizeof(rdata));
-    if(H5Dread(dset_id, dtype1_id, H5S_ALL, H5S_ALL, H5P_DEFAULT, &rdata) < 0) {
-        H5_FAILED(); AT();
-        printf("Can't read data\n");
-        goto error;
-    } /* end if */
-
-    if(rdata.i1 != wdata.i1 || rdata.i2 != wdata.i2 || HDstrcmp(rdata.str, wdata.str)) {
-        H5_FAILED(); AT();
-        printf("incorrect read data\n");
-        goto error;
-    } /* end if */
+    dset_id = H5Dopen2(file, DSETNAME[3], H5P_DEFAULT);
+    if(dset_id < 0) TEST_ERROR
+    dtype1_id = H5Dget_type(dset_id);
+    if(dtype1_id < 0) TEST_ERROR
+    TSOHM_S1H_VERIFY_DATA(dset_id, dtype1_id)
 
     if(H5Dclose(dset_id) < 0) TEST_ERROR
     if(H5Tclose(dtype1_id) < 0) TEST_ERROR
@@ -717,7 +728,42 @@ size1_helper(hid_t file, const char* filename, hid_t fapl_id, int test_file_clos
         H5Fclose(file);
     } H5E_END_TRY
     return -1;
-}
+#undef TSOHM_S1H_VERIFY_DATA /* macro is exclusive to this function */
+} /* size1_helper */
+
+
+/*----------------------------------------------------------------------------
+ * Function: getsize_testsize1
+ *
+ * Purpose: Creates a test file, populates it, and returns its file size.
+ *          Oject header information from the "first" dataset in the file
+ *          is stored in pointer `oinfo`.
+ *
+ * Programmer: Jacob Smith
+ *             2018 November 1
+ *----------------------------------------------------------------------------
+ */
+static h5_stat_size_t
+getsize_testsize1(const char *filename, hid_t fcpl_id, hid_t fapl_id, unsigned open_close, H5O_info_t *oinfo)
+{
+    hid_t file = -1;
+    herr_t ret;
+
+    file = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, fapl_id);
+    CHECK_I(file, "H5Fcreate");
+
+    file = size1_helper(file, FILENAME, fapl_id, open_close);
+    CHECK_I(file, "size1_helper");
+
+    ret = H5Oget_info_by_name2(file, DSETNAME[0], oinfo, H5O_INFO_HDR, H5P_DEFAULT);
+    CHECK_I(ret, "H5Oget_info_by_name");
+
+    ret = H5Fclose(file);
+    CHECK_I(ret, "H5Fclose");
+
+    return h5_get_file_size(FILENAME, fapl_id);
+} /* getsize_testsize1 */
+
 
 /*-------------------------------------------------------------------------
  * Function:    test_sohm_size1
@@ -727,17 +773,26 @@ size1_helper(hid_t file, const char* filename, hid_t fapl_id, int test_file_clos
  * Programmer:  James Laird
  *              Monday, April 10, 2006
  *
- * Modifications:
- *
  *-------------------------------------------------------------------------
  */
-static void test_sohm_size1(void)
+static void
+test_sohm_size1(void)
 {
     hid_t       file = -1;
     hid_t       fcpl_id = -1;
     hid_t       fapl_id = -1;
-    hsize_t     sohm_oh_size;
-    hsize_t     sohm_btree_oh_size;
+
+    unsigned       use_shared = 0;
+    unsigned       use_btree = 0;
+    unsigned       open_close = 0;
+    h5_stat_size_t file_sizes[9];
+    unsigned       size_index = 0;
+    hsize_t        oh_sizes[3];
+    unsigned       oh_size_index = 0;
+
+    hsize_t        norm_oh_size;
+    hsize_t        sohm_oh_size;
+    hsize_t        sohm_btree_oh_size;
     h5_stat_size_t norm_empty_filesize;
     h5_stat_size_t sohm_empty_filesize;
     h5_stat_size_t sohm_btree_empty_filesize;
@@ -747,6 +802,7 @@ static void test_sohm_size1(void)
     h5_stat_size_t norm_final_filesize2;
     h5_stat_size_t sohm_final_filesize2;
     h5_stat_size_t sohm_btree_final_filesize2;
+
     H5O_info_t  oinfo;
     unsigned    num_indexes = 1;
     unsigned    index_flags = H5O_SHMESG_DTYPE_FLAG;
@@ -757,177 +813,103 @@ static void test_sohm_size1(void)
 
     MESSAGE(5, ("Testing that shared datatypes save space\n"));
 
-
     /* Create a FAPL with "semi" close degree, to detect dangling IDs */
     fapl_id = H5Pcreate(H5P_FILE_ACCESS);
     CHECK_I(fapl_id, "H5Pcreate");
-
     ret = H5Pset_fclose_degree(fapl_id, H5F_CLOSE_SEMI);
     CHECK_I(ret, "H5Pset_fclose_degree");
 
-    /* Create a file with SOHMs disabled and get its size */
-    fcpl_id = H5Pcreate(H5P_FILE_CREATE);
-    CHECK_I(fcpl_id, "H5Pcreate");
-
-    ret = H5Pset_shared_mesg_nindexes(fcpl_id, 0);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
-
-    file = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, fapl_id);
-    CHECK_I(file, "H5Fcreate");
-
-    ret = H5Fclose(file);
-    CHECK_I(ret, "H5Fclose");
-
-    /* Get the file size */
-    norm_empty_filesize = h5_get_file_size(FILENAME, fapl_id);
-
-    /* Add a bunch of large datatypes to the file */
-    file = H5Fopen(FILENAME, H5F_ACC_RDWR, fapl_id);
-    CHECK_I(file, "H5Fopen");
-    file = size1_helper(file, FILENAME, fapl_id, 0);
-    CHECK_I(file, "size1_helper");
-    ret = H5Fclose(file);
-    CHECK_I(ret, "H5Fclose");
-
-    /* Get the new file size */
-    norm_final_filesize = h5_get_file_size(FILENAME, fapl_id);
-
-    /* Use the same property list to create a new file. */
-    file = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, fapl_id);
-    CHECK_I(file, "H5Fcreate");
-
-    ret = H5Pclose(fcpl_id);
-    CHECK_I(ret, "H5Pclose");
-
-    /* Add the same large datatypes, but keep closing and re-opening the file */
-    file = size1_helper(file, FILENAME, fapl_id, 1);
-    CHECK_I(file, "size1_helper");
-    ret = H5Fclose(file);
-    CHECK_I(ret, "H5Fclose");
-
-    /* Get the file size */
-    norm_final_filesize2 = h5_get_file_size(FILENAME, fapl_id);
-
-
-
-    /* Now do the same thing for a file with SOHMs enabled */
-    /* Create FCPL with SOHMs enabled */
-    fcpl_id = H5Pcreate(H5P_FILE_CREATE);
-    CHECK_I(fcpl_id, "H5Pcreate");
-
-    /* Tests one index holding only datatype messages */
-    ret = H5Pset_shared_mesg_nindexes(fcpl_id, num_indexes);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
-    ret = H5Pset_shared_mesg_index(fcpl_id, 0, index_flags, min_mesg_size);
-    CHECK_I(ret, "H5Pset_shared_mesg_index");
-    ret = H5Pset_shared_mesg_phase_change(fcpl_id, list_max, btree_min);
-    CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
-
-    /* Create a file */
-    file = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, fapl_id);
-    CHECK_I(file, "H5Fcreate");
-
-    ret = H5Fclose(file);
-    CHECK_I(ret, "H5Fclose");
-
-    sohm_empty_filesize = h5_get_file_size(FILENAME, fapl_id);
-
-    /* Add a bunch of datatypes to this file */
-    file = H5Fopen(FILENAME, H5F_ACC_RDWR, fapl_id);
-    CHECK_I(file, "H5Fopen");
-    file = size1_helper(file, FILENAME, fapl_id, 0);
-    CHECK_I(file, "size1_helper");
+    /* ----------------------------------------
+     * Run operations, accumulating file sizes to compare later.
+     */
+
+    for (use_shared = 0; use_shared < 2; use_shared++) {
+        for (use_btree = 0; use_btree < 2; use_btree++) {
+
+            /* cannot use btree indexing without shared messages; skip case */
+            if (use_btree && !use_shared)
+                continue;
+
+            fcpl_id = H5Pcreate(H5P_FILE_CREATE);
+            CHECK_I(fcpl_id, "H5Pcreate");
+
+            if (use_shared) {
+                /* Tests one index holding only datatype messages */
+                ret = H5Pset_shared_mesg_nindexes(fcpl_id, num_indexes);
+                CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+                ret = H5Pset_shared_mesg_index(fcpl_id, 0, index_flags, min_mesg_size);
+                CHECK_I(ret, "H5Pset_shared_mesg_index");
+
+                if (use_btree) {
+                    ret = H5Pset_shared_mesg_phase_change(fcpl_id, 0, 0);
+                } else {
+                    ret = H5Pset_shared_mesg_phase_change(fcpl_id, list_max, btree_min);
+                }
+                CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
+            } else {
+                ret = H5Pset_shared_mesg_nindexes(fcpl_id, 0);
+                CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+            }
+
+            file = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, fapl_id);
+            CHECK_I(file, "H5Fcreate");
+            ret = H5Fclose(file);
+            CHECK_I(ret, "H5Fclose");
 
-    /* Get the size of a dataset object header */
-    ret = H5Oget_info_by_name2(file, DSETNAME[0], &oinfo, H5O_INFO_HDR, H5P_DEFAULT);
-    CHECK_I(ret, "H5Oget_info_by_name");
-    ret = H5Fclose(file);
-    CHECK_I(ret, "H5Fclose");
-    sohm_oh_size = oinfo.hdr.space.total;
+            /* size of empty file */
+            file_sizes[size_index++] = h5_get_file_size(FILENAME, fapl_id);
 
-    /* Get the new file size */
-    sohm_final_filesize = h5_get_file_size(FILENAME, fapl_id);
+            /* size of populated file, with different populating behaviors */
+            for (open_close = 0; open_close < 2; open_close++)
+                file_sizes[size_index++] = getsize_testsize1(FILENAME, fcpl_id, fapl_id, open_close, &oinfo);
+            oh_sizes[oh_size_index++] = oinfo.hdr.space.total;
 
-    /* Use the same property list to create a new file. */
-    file = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, fapl_id);
-    CHECK_I(file, "H5Fcreate");
+            ret = H5Pclose(fcpl_id);
+            CHECK_I(ret, "H5Pclose");
+        } /* for btree/listed messages */
+    } /* for normal/shared messages */
 
-    ret = H5Pclose(fcpl_id);
+    ret = H5Pclose(fapl_id);
     CHECK_I(ret, "H5Pclose");
 
-    /* Add the same large datatypes, but keep closing and re-opening the file */
-    file = size1_helper(file, FILENAME, fapl_id, 1);
-    CHECK_I(file, "size1_helper");
-    ret = H5Fclose(file);
-    CHECK_I(ret, "H5Fclose");
-
-    /* Get the file size */
-    sohm_final_filesize2 = h5_get_file_size(FILENAME, fapl_id);
-
-
-
-    /* Create FCPL with SOHMs enabled that uses a B-tree index */
-    fcpl_id = H5Pcreate(H5P_FILE_CREATE);
-    CHECK_I(fcpl_id, "H5Pcreate");
-
-    /* Tests one index holding only datatype messages */
-    ret = H5Pset_shared_mesg_nindexes(fcpl_id, num_indexes);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
-    ret = H5Pset_shared_mesg_index(fcpl_id, 0, index_flags, min_mesg_size);
-    CHECK_I(ret, "H5Pset_shared_mesg_index");
-    ret = H5Pset_shared_mesg_phase_change(fcpl_id, 0, 0);
-    CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
-
-    /* Create a file */
-    file = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, fapl_id);
-    CHECK_I(file, "H5Fcreate");
-
-    ret = H5Fclose(file);
-    CHECK_I(ret, "H5Fclose");
+    /* sanity-check state of arrays */
+    VERIFY(9, size_index, "size_index");
+    VERIFY(3, oh_size_index, "oh_size_index");
 
-    sohm_btree_empty_filesize = h5_get_file_size(FILENAME, fapl_id);
-
-    /* Add a bunch of datatypes to this file */
-    file = H5Fopen(FILENAME, H5F_ACC_RDWR, fapl_id);
-    CHECK_I(file, "H5Fopen");
-    file = size1_helper(file, FILENAME, fapl_id, 0);
-    CHECK_I(file, "size1_helper");
-
-    /* Get the size of a dataset object header */
-    ret = H5Oget_info_by_name2(file, DSETNAME[0], &oinfo, H5O_INFO_HDR, H5P_DEFAULT);
-    CHECK_I(ret, "H5Oget_info_by_name");
-    ret = H5Fclose(file);
-    CHECK_I(ret, "H5Fclose");
-    sohm_btree_oh_size = oinfo.hdr.space.total;
-
-    /* Get the new file size */
-    sohm_btree_final_filesize = h5_get_file_size(FILENAME, fapl_id);
-
-    /* Use the same property list to create a new file. */
-    file = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, fapl_id);
-    CHECK_I(file, "H5Fcreate");
-
-    ret = H5Pclose(fcpl_id);
-    CHECK_I(ret, "H5Pclose");
+    /* ----------------------------------------
+     * Check that all sizes make sense.
+     */
 
-    /* Add the same large datatypes, but keep closing and re-opening the file */
-    file = size1_helper(file, FILENAME, fapl_id, 1);
-    CHECK_I(file, "size1_helper");
-    ret = H5Fclose(file);
-    CHECK_I(ret, "H5Fclose");
+    /* Put result sizes into human-readable symbolic names.
+     * Order dependent on loop execution above.
+     */
+    norm_empty_filesize = file_sizes[0];
+    norm_final_filesize = file_sizes[1];
+    norm_final_filesize2 = file_sizes[2];
+    norm_oh_size = oh_sizes[0];
 
-    /* Get the file size */
-    sohm_btree_final_filesize2 = h5_get_file_size(FILENAME, fapl_id);
+    sohm_empty_filesize = file_sizes[3];
+    sohm_final_filesize = file_sizes[4];
+    sohm_final_filesize2 = file_sizes[5];
+    sohm_oh_size = oh_sizes[1];
 
+    sohm_btree_empty_filesize = file_sizes[6];
+    sohm_btree_final_filesize = file_sizes[7];
+    sohm_btree_final_filesize2 = file_sizes[8];
+    sohm_btree_oh_size = oh_sizes[2];
 
+    /* How the SOHM messages are stored shouldn't affect the
+     * size of the object header.
+     */
+    VERIFY(sohm_btree_oh_size, sohm_oh_size, "H5Oget_info_by_name");
 
-    /* Check that all sizes make sense */
+#if 0 /* TBD: lying comment or bug. See Jira HDFFV-10646 */
     /* Object headers in SOHM files should be smaller than normal object
-     * headers.  How the SOHM messages are stored shouldn't affect the
-     * size of the object header.
+     * headers.
      */
-    if(sohm_oh_size != sohm_btree_oh_size)
-        VERIFY(sohm_btree_oh_size, 1, "H5Oget_info_by_name");
+    if (sohm_oh_size >= norm_oh_size)
+        VERIFY(norm_oh_size, 1, "H5Oget_info_by_name");
+#endif /* Jira HDFFV-10646 */
 
     /* Both sohm files should be bigger than a normal file when empty.
      * It's hard to say whether a B-tree with no nodes allocated should be
@@ -942,23 +924,127 @@ static void test_sohm_size1(void)
         VERIFY(sohm_btree_empty_filesize, 1, "h5_get_file_size");
 
     /* When full, the sohm btree file should be smaller than the normal file.
-     * The sohm list file should be at least as small, since it doesn't need the
-     * overhead of a B-tree.
+     * The sohm list file should be at least as small, since it doesn't need
+     * the overhead of a B-tree.
      */
     if(sohm_btree_final_filesize >= norm_final_filesize)
         VERIFY(sohm_btree_final_filesize, 1, "h5_get_file_size");
     if(sohm_final_filesize > sohm_btree_final_filesize)
         VERIFY(sohm_final_filesize, 1, "h5_get_file_size");
 
-    /* This shouldn't change even if we open and close the file */
+    /* Comparative sizes shouldn't change even if we open and close the file
+     */
     if(sohm_btree_final_filesize2 >= norm_final_filesize2)
         VERIFY(sohm_btree_final_filesize2, 1, "h5_get_file_size");
     if(sohm_final_filesize2 > sohm_btree_final_filesize2)
         VERIFY(sohm_final_filesize2, 1, "h5_get_file_size");
 
+} /* test_sohm_size1 */
+
+
+/*---------------------------------------------------------------------------
+ * Function:    test_sohm_size_consistency_open_create
+ *
+ * Purpose:     Tests that header size is different depending on file open
+ *              procedure?
+ *              Uses "size1_helper" for file setup directed to a specific
+ *              file handle.
+ *
+ * Programmer:  Jacob Smith
+ *              2018 November 1
+ *
+ *---------------------------------------------------------------------------
+ */
+static void
+test_sohm_size_consistency_open_create(void)
+{
+    hid_t       file = -1;
+    hid_t       fcpl_id = -1;
+    hid_t       fapl_id = -1;
+    unsigned    use_btree;
+    hsize_t     oh_size_open;
+    hsize_t     oh_size_create;
+    H5O_info_t  oinfo;
+    unsigned    num_indexes = 1;
+    unsigned    index_flags = H5O_SHMESG_DTYPE_FLAG;
+    unsigned    min_mesg_size = 50;
+    unsigned    list_max = 11;
+    unsigned    btree_min = 10;
+    herr_t      ret;
+
+    MESSAGE(5, \
+    ("Testing that header size is consistent between H5Fopen and H5Fcreate\n"));
+
+    /* Create a FAPL with "semi" close degree, to detect dangling IDs */
+    fapl_id = H5Pcreate(H5P_FILE_ACCESS);
+    CHECK_I(fapl_id, "H5Pcreate");
+    ret = H5Pset_fclose_degree(fapl_id, H5F_CLOSE_SEMI);
+    CHECK_I(ret, "H5Pset_fclose_degree");
+
+    for (use_btree = 0; use_btree < 2; use_btree++) {
+        /* Create FCPL with SOHMs enabled
+         */
+        fcpl_id = H5Pcreate(H5P_FILE_CREATE);
+        CHECK_I(fcpl_id, "H5Pcreate");
+        ret = H5Pset_shared_mesg_nindexes(fcpl_id, num_indexes);
+        CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+        ret = H5Pset_shared_mesg_index(fcpl_id, 0, index_flags, min_mesg_size);
+        CHECK_I(ret, "H5Pset_shared_mesg_index");
+        if (use_btree) {
+            MESSAGE(5, ("----testing with btree index----\n"));
+            ret = H5Pset_shared_mesg_phase_change(fcpl_id, 0, 0);
+            CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
+        } else {
+            MESSAGE(5, ("----testing with normal index----\n"));
+            ret = H5Pset_shared_mesg_phase_change(fcpl_id, list_max, btree_min);
+            CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
+        }
+
+        /* Create empty file */
+        file = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, fapl_id);
+        CHECK_I(file, "H5Fcreate");
+        ret = H5Fclose(file);
+        CHECK_I(ret, "H5Fclose");
+
+        /* Test Open/Write
+         * Add messages to previously-created file */
+        file = H5Fopen(FILENAME, H5F_ACC_RDWR, fapl_id);
+        CHECK_I(file, "H5Fopen");
+        file = size1_helper(file, FILENAME, fapl_id, 0);
+        CHECK_I(file, "size1_helper");
+
+        /* Get the size of a dataset object header */
+        ret = H5Oget_info_by_name2(file, DSETNAME[0], &oinfo, H5O_INFO_HDR, H5P_DEFAULT);
+        CHECK_I(ret, "H5Oget_info_by_name");
+        oh_size_open = oinfo.hdr.space.total;
+
+        ret = H5Fclose(file);
+        CHECK_I(ret, "H5Fclose");
+
+        /* Test Create/Write
+         * Add messages to a newly-created file */
+        file = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, fapl_id);
+        CHECK_I(file, "H5Fcreate");
+        file = size1_helper(file, FILENAME, fapl_id, 0);
+        CHECK_I(file, "size1_helper");
+
+        /* Get the size of a dataset object header */
+        ret = H5Oget_info_by_name2(file, DSETNAME[0], &oinfo, H5O_INFO_HDR, H5P_DEFAULT);
+        CHECK_I(ret, "H5Oget_info_by_name");
+        oh_size_create = oinfo.hdr.space.total;
+
+        ret = H5Fclose(file);
+        CHECK_I(ret, "H5Fclose");
+
+        VERIFY(oh_size_create, oh_size_open, "H5Oget_info_by_name2");
+
+        ret = H5Pclose(fcpl_id);
+        CHECK_I(ret, "H5Pclose");
+    } /* for normal/btree indexing */
+
     ret = H5Pclose(fapl_id);
     CHECK_I(ret, "H5Pclose");
-}
+} /* test_sohm_size_consistency_open_create */
 
 
 /*-------------------------------------------------------------------------
@@ -966,149 +1052,110 @@ static void test_sohm_size1(void)
  *
  * Purpose:     Given an fcpl, tests creating attributes with and without
  *              committed datatypes.
+ *              Verify that an attribute can be written and read back.
+ *              Tests attribute on a Group.
+ *              Tests committed and non-committed datatypes.
+ *              Tests attribute access through `H5Aopen()`.
  *
  * Programmer:  James Laird
  *              Thursday, November 30, 2006
  *
  *-------------------------------------------------------------------------
  */
-static void sohm_attr_helper(hid_t fcpl_id)
+static void
+sohm_attr_helper(hid_t fcpl_id)
 {
     hid_t file_id;
-    hid_t type_id;
     hid_t space_id;
-    hid_t group_id;
-    hid_t attr_id, attr_id2;
     hsize_t dims = 2;
     int wdata[2] = {7, 42};
     int rdata[2];
     herr_t ret;
     size_t x;
+    unsigned op_index=0;
+#define TSOHM_SAH_OP_COUNT 3
+    const char *groupnames[TSOHM_SAH_OP_COUNT] = {
+        "group_for_nothing_special",
+        "group_for_commited_dtype",
+        "group_for_commited_dtype_and_other_ID_access",
+    };
 
-    /*----------------------------------------------------------------------------
-     *    Test attribute with transient datatype
-     */
-    /* Create a file using the fcpl */
     file_id = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, H5P_DEFAULT);
     CHECK_I(file_id, "H5Fcreate");
 
-    /* Create a normal datatype and dataset */
-    type_id = H5Tcopy(H5T_NATIVE_INT);
-    CHECK_I(type_id, "H5Tcopy");
     space_id = H5Screate_simple(1, &dims, &dims);
     CHECK_I(space_id, "H5Screate_simple");
 
-    /* Create and verify an attribute on a group */
-    group_id = H5Gcreate2(file_id, "group", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
-    CHECK_I(group_id, "H5Gcreate2");
-    attr_id = H5Acreate2(group_id, "attribute", type_id, space_id, H5P_DEFAULT, H5P_DEFAULT);
-    CHECK_I(attr_id, "H5Acreate2");
-    ret = H5Awrite(attr_id, H5T_NATIVE_INT, wdata);
-    CHECK_I(ret, "H5Awrite");
-
-    /* Close the datatype and group */
-    ret = H5Tclose(type_id);
-    CHECK_I(ret, "H5Tclose");
-    ret = H5Gclose(group_id);
-    CHECK_I(ret, "H5Gclose");
-
-    /* Flush the file to force data to be written */
-    ret = H5Fflush(file_id, H5F_SCOPE_GLOBAL);
-    CHECK_I(ret, "H5Fflush");
-
-    /* Verify */
-    HDmemset(rdata, 0, sizeof(rdata));
-    ret = H5Aread(attr_id, H5T_NATIVE_INT, rdata);
-    CHECK_I(ret, "H5Aread");
-    for(x = 0; x < (size_t)dims; ++x)
-        VERIFY(rdata[x], wdata[x], "H5Aread");
-
-    /* Cleanup */
-    ret = H5Aclose(attr_id);
-    CHECK_I(ret, "H5Aclose");
-
-    /*----------------------------------------------------------------------------
-     *    Test attribute with committed datatype
+    /* loop:
+     * 0 - nothing special
+     * 1 - committed datatype
+     * 2 - committed datatype, read through second ID
      */
-    /* Repeat with a committed datatype */
-    type_id = H5Tcopy(H5T_NATIVE_INT);
-    CHECK_I(type_id, "H5Tcopy");
-    ret = H5Tcommit2(file_id, "datatype", type_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
-    CHECK_I(ret, "H5Tcommit2");
+    for (op_index = 0; op_index < TSOHM_SAH_OP_COUNT; op_index++) {
+        hid_t type_id  = -1;
+        hid_t group_id = -1;
+        hid_t attr_id  = -1;
+        hid_t attr_id2 = -1;
+        hid_t attr_read_id;
 
-    /* Create and verify an attribute */
-    group_id = H5Gcreate2(file_id, "another_group", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
-    CHECK_I(group_id, "H5Gcreate2");
-    attr_id = H5Acreate2(group_id, "attribute", type_id, space_id, H5P_DEFAULT, H5P_DEFAULT);
-    CHECK_I(attr_id, "H5Acreate2");
-    ret = H5Awrite(attr_id, H5T_NATIVE_INT, wdata);
-    CHECK_I(ret, "H5Awrite");
-
-    /* Close the datatype and group */
-    ret = H5Tclose(type_id);
-    CHECK_I(ret, "H5Tclose");
-    ret = H5Gclose(group_id);
-    CHECK_I(ret, "H5Gclose");
+        /* create group in file with name unique to op_index */
+        group_id = H5Gcreate2(file_id, groupnames[op_index], H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+        CHECK_I(group_id, "H5Gcreate2");
 
-    /* Flush the file to force data to be written */
-    ret = H5Fflush(file_id, H5F_SCOPE_GLOBAL);
-    CHECK_I(ret, "H5Fflush");
+        type_id = H5Tcopy(H5T_NATIVE_INT);
+        CHECK_I(type_id, "H5Tcopy");
 
-    /* Verify */
-    HDmemset(rdata, 0, sizeof(rdata));
-    ret = H5Aread(attr_id, H5T_NATIVE_INT, rdata);
-    CHECK_I(ret, "H5Aread");
-    for(x = 0; x < (size_t)dims; ++x)
-        VERIFY(rdata[x], wdata[x], "H5Aread");
-
-    /* Cleanup */
-    ret = H5Aclose(attr_id);
-    CHECK_I(ret, "H5Aclose");
-
-    /*----------------------------------------------------------------------------
-     *    Test attribute operation with two ID handles
-     */
-    /* Create and verify an attribute */
-    group_id = H5Gcreate2(file_id, "yet_another_group", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
-    CHECK_I(group_id, "H5Gcreate2");
-
-    attr_id = H5Acreate2(group_id, "attribute", H5T_NATIVE_INT, space_id, H5P_DEFAULT, H5P_DEFAULT);
-    CHECK_I(attr_id, "H5Acreate2");
+        /* Commit the datatype for the latter iterations.
+         * Only do this ONCE.
+         */
+        if (op_index == 1) {
+            ret = H5Tcommit2(file_id, "datatype", type_id, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+            CHECK_I(ret, "H5Tcommit2");
+        }
 
-    /* Open the attribute to get another handle */
-    attr_id2 = H5Aopen(group_id, "attribute", H5P_DEFAULT);
-    CHECK_I(attr_id2, "H5Aopen");
+        attr_id = H5Acreate2(group_id, "attribute", type_id, space_id, H5P_DEFAULT, H5P_DEFAULT);
+        CHECK_I(attr_id, "H5Acreate2");
 
-    ret = H5Awrite(attr_id, H5T_NATIVE_INT, wdata);
-    CHECK_I(ret, "H5Awrite");
+        if (op_index == 2) {
+            /* Open the attribute to get another handle */
+            attr_id2 = H5Aopen(group_id, "attribute", H5P_DEFAULT);
+            CHECK_I(attr_id2, "H5Aopen");
+        }
 
-    /* Close the group */
-    ret = H5Gclose(group_id);
-    CHECK_I(ret, "H5Gclose");
+        ret = H5Awrite(attr_id, H5T_NATIVE_INT, wdata);
+        CHECK_I(ret, "H5Awrite");
 
-    /* Flush the file to force data to be written */
-    ret = H5Fflush(file_id, H5F_SCOPE_GLOBAL);
-    CHECK_I(ret, "H5Fflush");
+        ret = H5Gclose(group_id);
+        CHECK_I(ret, "H5Gclose");
+        ret = H5Tclose(type_id);
+        CHECK_I(ret, "H5Tclose");
 
-    /* Verify the data with another ID handle */
-    HDmemset(rdata, 0, sizeof(rdata));
-    ret = H5Aread(attr_id2, H5T_NATIVE_INT, rdata);
-    CHECK_I(ret, "H5Aread");
+        /* Flush the file to force data to be written */
+        ret = H5Fflush(file_id, H5F_SCOPE_GLOBAL);
+        CHECK_I(ret, "H5Fflush");
 
-    for(x = 0; x < (size_t)dims; ++x)
-        VERIFY(rdata[x], wdata[x], "H5Aread");
+        /* Verify */
+        attr_read_id = (op_index == 2) ? attr_id2 : attr_id;
+        HDmemset(rdata, 0, sizeof(rdata));
+        ret = H5Aread(attr_read_id, H5T_NATIVE_INT, rdata);
+        CHECK_I(ret, "H5Aread");
+        for(x = 0; x < (size_t)dims; ++x)
+            VERIFY(rdata[x], wdata[x], "H5Aread");
 
-    /* Cleanup */
-    ret = H5Aclose(attr_id);
-    CHECK_I(ret, "H5Aclose");
-    ret = H5Aclose(attr_id2);
-    CHECK_I(ret, "H5Aclose");
+        ret = H5Aclose(attr_id);
+        CHECK_I(ret, "H5Aclose");
+        if (attr_id2 > -1 ) {
+            ret = H5Aclose(attr_id2);
+            CHECK_I(ret, "H5Aclose");
+        }
+    } /* for each attribute operation */
 
     ret = H5Sclose(space_id);
     CHECK_I(ret, "H5Sclose");
     ret = H5Fclose(file_id);
     CHECK_I(ret, "H5Fclose");
-}
+#undef TSOHM_SAH_OP_COUNT
+} /* sohm_attr_helper */
 
 
 /*-------------------------------------------------------------------------
@@ -1125,101 +1172,160 @@ static void sohm_attr_helper(hid_t fcpl_id)
  *
  *-------------------------------------------------------------------------
  */
-static void test_sohm_attrs(void)
+static void
+test_sohm_attrs(void)
 {
     hid_t fcpl_id;
+    unsigned i = 0;
+#define TSOHM_TSA_NFLAGS_1 7
+    unsigned flags1[TSOHM_TSA_NFLAGS_1] = {
+        H5O_SHMESG_ATTR_FLAG,
+        H5O_SHMESG_SDSPACE_FLAG,
+        H5O_SHMESG_DTYPE_FLAG,
+        H5O_SHMESG_ATTR_FLAG | H5O_SHMESG_SDSPACE_FLAG,
+        H5O_SHMESG_SDSPACE_FLAG | H5O_SHMESG_DTYPE_FLAG,
+        H5O_SHMESG_ATTR_FLAG | H5O_SHMESG_DTYPE_FLAG,
+        H5O_SHMESG_ATTR_FLAG | H5O_SHMESG_SDSPACE_FLAG | H5O_SHMESG_DTYPE_FLAG,
+    };
+#define TSOHM_TSA_NFLAGS_2 6
+    unsigned flags2[TSOHM_TSA_NFLAGS_2][2] = {
+        {   H5O_SHMESG_ATTR_FLAG,
+            H5O_SHMESG_SDSPACE_FLAG | H5O_SHMESG_DTYPE_FLAG,
+        },
+        {   H5O_SHMESG_SDSPACE_FLAG,
+            H5O_SHMESG_ATTR_FLAG | H5O_SHMESG_DTYPE_FLAG,
+        },
+        {   H5O_SHMESG_DTYPE_FLAG,
+            H5O_SHMESG_ATTR_FLAG | H5O_SHMESG_SDSPACE_FLAG,
+        },
+        {   H5O_SHMESG_SDSPACE_FLAG | H5O_SHMESG_DTYPE_FLAG,
+            H5O_SHMESG_ATTR_FLAG,
+        },
+        {   H5O_SHMESG_ATTR_FLAG | H5O_SHMESG_DTYPE_FLAG,
+            H5O_SHMESG_SDSPACE_FLAG,
+        },
+        {   H5O_SHMESG_ATTR_FLAG | H5O_SHMESG_SDSPACE_FLAG,
+            H5O_SHMESG_DTYPE_FLAG,
+        },
+    };
+#define TSOHM_TSA_NFLAGS_3 5
+    unsigned flags3[TSOHM_TSA_NFLAGS_3][3] = {
+        {   H5O_SHMESG_ATTR_FLAG,
+            H5O_SHMESG_SDSPACE_FLAG,
+            H5O_SHMESG_DTYPE_FLAG,
+        },
+        {   H5O_SHMESG_DTYPE_FLAG,
+            H5O_SHMESG_ATTR_FLAG,
+            H5O_SHMESG_SDSPACE_FLAG,
+        },
+        {   H5O_SHMESG_SDSPACE_FLAG,
+            H5O_SHMESG_DTYPE_FLAG,
+            H5O_SHMESG_ATTR_FLAG,
+        },
+        {   0, /* first index does not hold a shared message type? */
+            H5O_SHMESG_SDSPACE_FLAG | H5O_SHMESG_DTYPE_FLAG,
+            H5O_SHMESG_ATTR_FLAG,
+        },
+        {   0, /* missing SDSPACE flag */
+            H5O_SHMESG_DTYPE_FLAG,
+            H5O_SHMESG_ATTR_FLAG,
+        },
+    };
     herr_t ret;
 
     MESSAGE(5, ("Testing that shared messages work with attributes\n"));
 
-    /* Create an fcpl with no shared messages */
+    /* No shared messages
+     */
     fcpl_id = H5Pcreate(H5P_FILE_CREATE);
     CHECK_I(fcpl_id, "H5Pcreate");
     ret = H5Pset_shared_mesg_nindexes(fcpl_id, 0);
     CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
 
-    /* Make sure attributes can be read with these settings (they'd better!) */
-    sohm_attr_helper(fcpl_id);
-
-
-    /* Run tests with only one kind of message to be shared */
-    ret = H5Pset_shared_mesg_nindexes(fcpl_id, 1);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
-    ret = H5Pset_shared_mesg_index(fcpl_id, 0, H5O_SHMESG_ATTR_FLAG, 2);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
-
-    /* Verify */
-    sohm_attr_helper(fcpl_id);
-
-    ret = H5Pset_shared_mesg_index(fcpl_id, 0, H5O_SHMESG_SDSPACE_FLAG, 2);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
-
-    sohm_attr_helper(fcpl_id);
-
-    ret = H5Pset_shared_mesg_index(fcpl_id, 0, H5O_SHMESG_DTYPE_FLAG, 2);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
-
-    sohm_attr_helper(fcpl_id);
-
-
-    /* Run with any two types shared */
-    ret = H5Pset_shared_mesg_index(fcpl_id, 0, H5O_SHMESG_SDSPACE_FLAG | H5O_SHMESG_DTYPE_FLAG, 2);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
-
     sohm_attr_helper(fcpl_id);
 
-    ret = H5Pset_shared_mesg_index(fcpl_id, 0, H5O_SHMESG_ATTR_FLAG | H5O_SHMESG_DTYPE_FLAG, 2);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
-
-    sohm_attr_helper(fcpl_id);
-
-    ret = H5Pset_shared_mesg_index(fcpl_id, 0, H5O_SHMESG_SDSPACE_FLAG | H5O_SHMESG_ATTR_FLAG, 2);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
-
-    sohm_attr_helper(fcpl_id);
-
-
-    /* Run test with all three kinds of message shared */
-    ret = H5Pset_shared_mesg_index(fcpl_id, 0, H5O_SHMESG_SDSPACE_FLAG | H5O_SHMESG_DTYPE_FLAG | H5O_SHMESG_ATTR_FLAG, 2);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+    ret = H5Pclose(fcpl_id);
+    CHECK_I(ret, "H5Pclose");
 
-    sohm_attr_helper(fcpl_id);
+    /* One shared message index
+     */
+    for (i=0; i < TSOHM_TSA_NFLAGS_1; i++) {
+        fcpl_id = H5Pcreate(H5P_FILE_CREATE);
+        CHECK_I(fcpl_id, "H5Pcreate");
+        ret = H5Pset_shared_mesg_nindexes(fcpl_id, 1);
+        CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+        ret = H5Pset_shared_mesg_index(fcpl_id, 0, flags1[i], 2);
+        CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
 
+        sohm_attr_helper(fcpl_id);
 
-    /* Try using two indexes */
-    ret = H5Pset_shared_mesg_nindexes(fcpl_id, 2);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
-    ret = H5Pset_shared_mesg_index(fcpl_id, 0, H5O_SHMESG_ATTR_FLAG | H5O_SHMESG_DTYPE_FLAG, 2);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
-    ret = H5Pset_shared_mesg_index(fcpl_id, 1, H5O_SHMESG_SDSPACE_FLAG, 2);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+        ret = H5Pclose(fcpl_id);
+        CHECK_I(ret, "H5Pclose");
+    }
 
-    sohm_attr_helper(fcpl_id);
+    /* two shared message indices
+     */
+    for (i=0; i < TSOHM_TSA_NFLAGS_2; i++) {
+        fcpl_id = H5Pcreate(H5P_FILE_CREATE);
+        CHECK_I(fcpl_id, "H5Pcreate");
+        ret = H5Pset_shared_mesg_nindexes(fcpl_id, 2);
+        CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+        ret = H5Pset_shared_mesg_index(fcpl_id, 0, flags2[i][0], 2);
+        CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+        ret = H5Pset_shared_mesg_index(fcpl_id, 1, flags2[i][1], 2);
+        CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
 
-    ret = H5Pset_shared_mesg_index(fcpl_id, 0, H5O_SHMESG_DTYPE_FLAG, 2);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+        sohm_attr_helper(fcpl_id);
 
-    sohm_attr_helper(fcpl_id);
+        ret = H5Pclose(fcpl_id);
+        CHECK_I(ret, "H5Pclose");
+    }
 
-    ret = H5Pset_shared_mesg_index(fcpl_id, 1, H5O_SHMESG_ATTR_FLAG, 2);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+    /* duplicate flags in separate indices causes problems
+     */
+    H5E_BEGIN_TRY {
+        fcpl_id = H5Pcreate(H5P_FILE_CREATE);
+        CHECK_I(fcpl_id, "H5Pcreate");
+        ret = H5Pset_shared_mesg_nindexes(fcpl_id, 2);
+        CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+        ret = H5Pset_shared_mesg_index(fcpl_id, 0, H5O_SHMESG_ATTR_FLAG, 2);
+        CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+        ret = H5Pset_shared_mesg_index(fcpl_id, 1, H5O_SHMESG_ATTR_FLAG, 2);
+        CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+
+        ret = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, H5P_DEFAULT);
+        VERIFY(ret, -1, "H5Fcreate");
+
+        ret = H5Pclose(fcpl_id);
+        CHECK_I(ret, "H5Pclose");
+    } H5E_END_TRY;
 
-    sohm_attr_helper(fcpl_id);
+    /* three shared message indices
+     */
+    for (i=0; i < TSOHM_TSA_NFLAGS_3; i++) {
+        fcpl_id = H5Pcreate(H5P_FILE_CREATE);
+        CHECK_I(fcpl_id, "H5Pcreate");
+        ret = H5Pset_shared_mesg_nindexes(fcpl_id, 3);
+        CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+        ret = H5Pset_shared_mesg_index(fcpl_id, 0, flags3[i][0], 2);
+        CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+        ret = H5Pset_shared_mesg_index(fcpl_id, 1, flags3[i][1], 2);
+        CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+        ret = H5Pset_shared_mesg_index(fcpl_id, 2, flags3[i][2], 2);
+        CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
 
+        sohm_attr_helper(fcpl_id);
 
-    /* One index for each kind of message */
-    ret = H5Pset_shared_mesg_nindexes(fcpl_id, 3);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
-    ret = H5Pset_shared_mesg_index(fcpl_id, 2, H5O_SHMESG_SDSPACE_FLAG, 2);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
+        ret = H5Pclose(fcpl_id);
+        CHECK_I(ret, "H5Pclose");
+    }
 
-    sohm_attr_helper(fcpl_id);
+#undef TSOHM_TSA_NFLAGS_1
+#undef TSOHM_TSA_NFLAGS_2
+#undef TSOHM_TSA_NFLAGS_3
 
+} /* test_sohm_attrs */
 
-    /* Close the FCPL */
-    ret = H5Pclose(fcpl_id);
-    CHECK_I(ret, "H5Pclose");
-}
 
 /*-------------------------------------------------------------------------
  * Function:    size2_verify_plist1
@@ -1233,7 +1339,8 @@ static void test_sohm_attrs(void)
  *
  *-------------------------------------------------------------------------
  */
-static void size2_verify_plist1(hid_t plist)
+static void
+size2_verify_plist1(hid_t plist)
 {
     size_t cd_nelmts;
     unsigned int cd_value;
@@ -1281,7 +1388,8 @@ static void size2_verify_plist1(hid_t plist)
 
     ret = H5Tclose(dtype1_id);
     CHECK_I(ret, "H5Tclose");
-}
+} /* size2_verify_plist1 */
+
 
 /*-------------------------------------------------------------------------
  * Function:    size2_verify_plist2
@@ -1295,7 +1403,8 @@ static void size2_verify_plist1(hid_t plist)
  *
  *-------------------------------------------------------------------------
  */
-static void size2_verify_plist2(hid_t plist)
+static void
+size2_verify_plist2(hid_t plist)
 {
     size_t cd_nelmts;
     unsigned int cd_value;
@@ -1352,7 +1461,7 @@ static void size2_verify_plist2(hid_t plist)
 
     ret = H5Tclose(dtype2_id);
     CHECK_I(ret, "H5Tclose");
-}
+} /* size2_verify_plist2 */
 
 #ifdef NOT_NOW
 
@@ -1382,7 +1491,7 @@ size2_dump_struct(const char *name, size2_helper_struct *sizes)
   printf("   interleaved: %llu \tdelta: %llu\n", (unsigned long long)sizes->interleaved, (unsigned long long)(sizes->interleaved - sizes->dsets2));
   printf("    attributes: %llu \tdelta: %llu\n", (unsigned long long)sizes->attrs1, (unsigned long long)(sizes->attrs1 - sizes->interleaved));
   printf("  attributes 2: %llu \tdelta: %llu\n", (unsigned long long)sizes->attrs2, (unsigned long long)(sizes->attrs2 - sizes->attrs1));
-}
+} /* size2_dump_struct */
 #endif /* NOT_NOW */
 
 
@@ -1573,15 +1682,14 @@ size2_helper(hid_t fcpl_id, int test_file_closing, size2_helper_struct *ret_size
     ret_sizes->dsets1 = h5_get_file_size(FILENAME, H5P_DEFAULT);
 
 
-    /* Now create a new group filled with datasets that use all different messages */
+    /* Create new group filled with datasets that use all different messages */
     file_id = H5Fopen(FILENAME, H5F_ACC_RDWR, H5P_DEFAULT);
     CHECK_I(file_id, "H5Fopen");
     group_id = H5Gcreate2(file_id, "group", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
     CHECK_I(group_id, "H5Gcreate2");
 
     /* Create NUM_DATASETS datasets in the new group */
-    for(x=0; x<NUM_DATASETS; ++x)
-    {
+    for(x=0; x<NUM_DATASETS; ++x) {
         dset_id = H5Dcreate2(group_id, DSETNAME[x], dtype2_id, dspace2_id, H5P_DEFAULT, dcpl2_id, H5P_DEFAULT);
         CHECK_I(dset_id, "H5Dcreate2");
 
@@ -1768,7 +1876,7 @@ size2_helper(hid_t fcpl_id, int test_file_closing, size2_helper_struct *ret_size
     CHECK_I(ret, "H5Pclose");
 
     return 0;
-}
+} /* size2_helper */
 
 
 /*-------------------------------------------------------------------------
@@ -1785,7 +1893,8 @@ size2_helper(hid_t fcpl_id, int test_file_closing, size2_helper_struct *ret_size
  *
  *-------------------------------------------------------------------------
  */
-static void size2_verify(void)
+static void
+size2_verify(void)
 {
     hid_t file_id = -1;
     hid_t dset_id=-1;
@@ -1968,7 +2077,7 @@ static void size2_verify(void)
     CHECK_I(ret, "H5Gclose");
     ret = H5Fclose(file_id);
     CHECK_I(ret, "H5Fclose");
-}
+} /* size2_verify */
 
 
 /*-------------------------------------------------------------------------
@@ -1993,7 +2102,8 @@ static void size2_verify(void)
  *
  *-------------------------------------------------------------------------
  */
-static void test_sohm_size2(int close_reopen)
+static void
+test_sohm_size2(int close_reopen)
 {
     hid_t       fcpl_id = -1;
     /* Sizes for file with no shared messages at all */
@@ -2585,7 +2695,7 @@ static void test_sohm_size2(int close_reopen)
         VERIFY(0, 1, "h5_get_file_size");
     if((h5_stat_size_t)((float)share_tiny_index.attrs2 * OVERHEAD_ALLOWED) < type_space_index.attrs2)
         VERIFY(0, 1, "h5_get_file_size");
-} /* end test_sohm_size2() */
+} /* test_sohm_size2 */
 
 
 /*-------------------------------------------------------------------------
@@ -2601,27 +2711,22 @@ static void test_sohm_size2(int close_reopen)
  *
  *-------------------------------------------------------------------------
  */
-static void delete_helper_write(hid_t file_id, hid_t *dspace_id, hid_t *dcpl_id, int x)
+static void
+delete_helper_write(hid_t file_id, hid_t *dspace_id, hid_t *dcpl_id, int x)
 {
-    hid_t dset_id = -1;
-    hid_t attr_id = -1;
-    char wdata;
+    hid_t  dset_id = -1;
+    hid_t  attr_id = -1;
+    char   wdata;
     herr_t ret;
 
-    /* Create dataset */
     dset_id = H5Dcreate2(file_id, DSETNAME[x], H5T_NATIVE_CHAR, dspace_id[x], H5P_DEFAULT, dcpl_id[x], H5P_DEFAULT);
     CHECK_I(dset_id, "H5Dcreate2");
-
-    /* Write data to dataset */
     wdata = (char)(x + 'a');
     ret = H5Dwrite(dset_id, H5T_NATIVE_CHAR, dspace_id[x], dspace_id[x], H5P_DEFAULT, &wdata);
     CHECK_I(ret, "H5Dwrite");
 
-    /* Create an attribute on the dataset. */
     attr_id = H5Acreate2(dset_id, "attr_name", H5T_NATIVE_CHAR, dspace_id[x], H5P_DEFAULT, H5P_DEFAULT);
     CHECK_I(attr_id, "H5Acreate2");
-
-    /* Write to attribute */
     ret = H5Awrite(attr_id, H5T_NATIVE_CHAR, &wdata);
     CHECK_I(ret, "H5Awrite");
 
@@ -2629,7 +2734,7 @@ static void delete_helper_write(hid_t file_id, hid_t *dspace_id, hid_t *dcpl_id,
     CHECK_I(ret, "H5Aclose");
     ret = H5Dclose(dset_id);
     CHECK_I(ret, "H5Dclose");
-}
+} /* delete_helper_write */
 
 
 /*-------------------------------------------------------------------------
@@ -2645,39 +2750,33 @@ static void delete_helper_write(hid_t file_id, hid_t *dspace_id, hid_t *dcpl_id,
  *
  *-------------------------------------------------------------------------
  */
-static void delete_helper_read(hid_t file_id, hid_t *dspace_id, int x)
+static void
+delete_helper_read(hid_t file_id, hid_t *dspace_id, int x)
 {
     hid_t dset_id = -1;
     hid_t attr_id = -1;
     char rdata;
     herr_t ret;
 
-    /* Open dataset */
     dset_id = H5Dopen2(file_id, DSETNAME[x], H5P_DEFAULT);
     CHECK_I(dset_id, "H5Dopen2");
-
-    /* Read */
     rdata = '\0';
     ret = H5Dread(dset_id, H5T_NATIVE_CHAR, dspace_id[x], dspace_id[x], H5P_DEFAULT, &rdata);
     CHECK_I(ret, "H5Dread");
     VERIFY(rdata, (x + 'a'), "H5Dread");
 
-    /* Open attribute */
     attr_id = H5Aopen(dset_id, "attr_name", H5P_DEFAULT);
     CHECK_I(attr_id, "H5Aopen");
-
-    /* Read */
     rdata = '\0';
     ret = H5Aread(attr_id, H5T_NATIVE_CHAR, &rdata);
     CHECK_I(ret, "H5Dread");
     VERIFY(rdata, (x + 'a'), "H5Dread");
 
-    /* Cleanup */
     ret = H5Aclose(attr_id);
     CHECK_I(ret, "H5Aclose");
     ret = H5Dclose(dset_id);
     CHECK_I(ret, "H5Dclose");
-}
+} /* delete_helper_read */
 
 
 /*-------------------------------------------------------------------------
@@ -2701,7 +2800,8 @@ static void delete_helper_read(hid_t file_id, hid_t *dspace_id, int x)
  *
  *-------------------------------------------------------------------------
  */
-static void delete_helper(hid_t fcpl_id, hid_t *dspace_id, hid_t *dcpl_id)
+static void
+delete_helper(hid_t fcpl_id, hid_t *dspace_id, hid_t *dcpl_id)
 {
     hid_t file_id=-1;
     int x;
@@ -2765,7 +2865,7 @@ static void delete_helper(hid_t fcpl_id, hid_t *dspace_id, hid_t *dcpl_id)
         VERIFY(norm_filesize, deleted_filesize, "h5_get_file_size");
     if(deleted_filesize > (h5_stat_size_t)((float)norm_filesize * OVERHEAD_ALLOWED))
         VERIFY(deleted_filesize, norm_filesize, "h5_get_file_size");
-}
+} /* delete_helper */
 
 
 /*-------------------------------------------------------------------------
@@ -2799,6 +2899,8 @@ test_sohm_delete(void)
     hsize_t dims[] = DELETE_DIMS;
     herr_t ret;
 
+    MESSAGE(5, ("Testing deletion of SOHMs\n"));
+
     /* Create a number of different dataspaces.
      * For simplicity, each dataspace has only one element.
      */
@@ -2910,17 +3012,18 @@ test_sohm_delete(void)
         ret = H5Pclose(dcpl_id[x]);
         CHECK_I(ret, "H5Pclose");
     } /* end for */
-} /* end test_sohm_delete() */
+} /* test_sohm_delete */
 
 
 /*-------------------------------------------------------------------------
- * Function:    test_sohm_delete_revert_helper
+ * Function:    verify_dset_create_and_delete_does_not_grow_file
  *
  * Purpose:     Tests that shared object header message deletion returns
  *              the file to its previous state using the supplied FCPL.
  *
- *              Creates shared messages and then deletes them.  Ensures
- *              that the file has not grown in size.
+ *              Creates a file according to the supplied FCPL,
+ *              then creates datasets and deletes them.
+ *              Done in two passes: once with one dataset, once with two.
  *
  * Programmer:  James Laird
  *              Wednesday, January 3, 2007
@@ -2930,7 +3033,7 @@ test_sohm_delete(void)
  *-------------------------------------------------------------------------
  */
 static int
-test_sohm_delete_revert_helper(hid_t fcpl_id)
+verify_dset_create_and_delete_does_not_grow_file(hid_t fcpl_id)
 {
     hid_t file_id;
     hid_t dspace_id;
@@ -3017,13 +3120,14 @@ test_sohm_delete_revert_helper(hid_t fcpl_id)
         return(0);
     else
         return(-1);
-} /* test_sohm_delete_revert_helper() */
+} /* verify_dset_create_and_delete_does_not_grow_file */
 
 
 /*-------------------------------------------------------------------------
  * Function:    test_sohm_delete_revert
  *
- * Purpose:     Calls test_sohm_delete_revert_helper with different FCPLs.
+ * Purpose:     Verifies that creation and deletion of datasets with shared
+ *              message headers will not increase file size.
  *
  * Programmer:  James Laird
  *              Wednesday, January 3, 2007
@@ -3038,6 +3142,8 @@ test_sohm_delete_revert(void)
     hid_t fcpl_id;
     herr_t ret;
 
+    MESSAGE(5, ("Testing that file reverts to original size on SOHM deletion\n"));
+
     /* Create an fcpl with messages in two indexes */
     fcpl_id = H5Pcreate(H5P_FILE_CREATE);
     CHECK_I(fcpl_id, "H5Pcreate");
@@ -3049,14 +3155,14 @@ test_sohm_delete_revert(void)
     CHECK_I(ret, "H5Pset_shared_mesg_index");
 
     /* Call the helper function to test this FCPL. */
-    ret = test_sohm_delete_revert_helper(fcpl_id);
-    CHECK_I(ret, "test_sohm_delete_revert_helper");
+    ret = verify_dset_create_and_delete_does_not_grow_file(fcpl_id);
+    CHECK_I(ret, "verify_dset_create_and_delete_does_not_grow_file");
 
     /* Try using B-trees */
     ret = H5Pset_shared_mesg_phase_change(fcpl_id, 0, 0);
     CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
-    ret = test_sohm_delete_revert_helper(fcpl_id);
-    CHECK_I(ret, "test_sohm_delete_revert_helper");
+    ret = verify_dset_create_and_delete_does_not_grow_file(fcpl_id);
+    CHECK_I(ret, "verify_dset_create_and_delete_does_not_grow_file");
 
 
     /* Try sharing all messages */
@@ -3067,14 +3173,14 @@ test_sohm_delete_revert(void)
     ret = H5Pset_shared_mesg_phase_change(fcpl_id, 10, 5);
     CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
 
-    ret = test_sohm_delete_revert_helper(fcpl_id);
-    CHECK_I(ret, "test_sohm_delete_revert_helper");
+    ret = verify_dset_create_and_delete_does_not_grow_file(fcpl_id);
+    CHECK_I(ret, "verify_dset_create_and_delete_does_not_grow_file");
 
     /* Try using B-trees */
     ret = H5Pset_shared_mesg_phase_change(fcpl_id, 0, 0);
     CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
-    ret = test_sohm_delete_revert_helper(fcpl_id);
-    CHECK_I(ret, "test_sohm_delete_revert_helper");
+    ret = verify_dset_create_and_delete_does_not_grow_file(fcpl_id);
+    CHECK_I(ret, "verify_dset_create_and_delete_does_not_grow_file");
 
     /* There should be at least two messages in the test (datatype and
      * dataspace).  Use an index that will transition from a list to
@@ -3082,8 +3188,8 @@ test_sohm_delete_revert(void)
      */
     ret = H5Pset_shared_mesg_phase_change(fcpl_id, 1, 2);
     CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
-    ret = test_sohm_delete_revert_helper(fcpl_id);
-    CHECK_I(ret, "test_sohm_delete_revert_helper");
+    ret = verify_dset_create_and_delete_does_not_grow_file(fcpl_id);
+    CHECK_I(ret, "verify_dset_create_and_delete_does_not_grow_file");
 
 
     /* Try with shared messages enabled, but when messages are too big
@@ -3091,16 +3197,16 @@ test_sohm_delete_revert(void)
      */
     ret = H5Pset_shared_mesg_index(fcpl_id, 0, H5O_SHMESG_ALL_FLAG, 35);
     CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
-    ret = test_sohm_delete_revert_helper(fcpl_id);
-    CHECK_I(ret, "test_sohm_delete_revert_helper");
+    ret = verify_dset_create_and_delete_does_not_grow_file(fcpl_id);
+    CHECK_I(ret, "verify_dset_create_and_delete_does_not_grow_file");
 
     ret = H5Pclose(fcpl_id);
     CHECK_I(ret, "H5Pclose");
-}
+} /* test_sohm_delete_revert */
 
 
 /*-------------------------------------------------------------------------
- * Function:    test_sohm_extlink_helper
+ * Function:    verify_dset_create_and_open_through_extlink_with_sohm
  *
  * Purpose:     Tests that a dataset created through an external link can
  *              be opened (that shared messages were created or not and
@@ -3113,7 +3219,8 @@ test_sohm_delete_revert(void)
  *
  *-------------------------------------------------------------------------
  */
-static void test_sohm_extlink_helper(hid_t src_fcpl_id, hid_t dst_fcpl_id)
+static void
+verify_dset_create_and_open_through_extlink_with_sohm(hid_t src_fcpl_id, hid_t dst_fcpl_id)
 {
     hid_t src_file_id = -1;
     hid_t dst_file_id = -1;
@@ -3164,7 +3271,7 @@ static void test_sohm_extlink_helper(hid_t src_fcpl_id, hid_t dst_fcpl_id)
     CHECK_I(ret, "H5Dclose");
     ret = H5Fclose(dst_file_id);
     CHECK_I(ret, "H5Fclose");
-}
+} /* verify_dset_create_and_open_through_extlink_with_sohm */
 
 
 /*-------------------------------------------------------------------------
@@ -3186,7 +3293,8 @@ test_sohm_extlink(void)
     hid_t fcpl_id = -1;
     herr_t ret;
 
-    /* Create fcpl */
+    MESSAGE(5, ("Testing SOHM creation through external links\n"));
+
     fcpl_id = H5Pcreate(H5P_FILE_CREATE);
     CHECK_I(fcpl_id, "H5Pcreate");
     ret = H5Pset_shared_mesg_nindexes(fcpl_id, 1);
@@ -3194,20 +3302,17 @@ test_sohm_extlink(void)
     ret = H5Pset_shared_mesg_index(fcpl_id, 0, H5O_SHMESG_ALL_FLAG, 16);
     CHECK_I(ret, "H5Pset_shared_mesg_index");
 
-    /* Test using external links when the source or destination file uses
-     * shared messages
-     */
-    test_sohm_extlink_helper(fcpl_id, H5P_DEFAULT);
-    test_sohm_extlink_helper(H5P_DEFAULT, fcpl_id);
-    test_sohm_extlink_helper(fcpl_id, fcpl_id);
+    verify_dset_create_and_open_through_extlink_with_sohm(fcpl_id, H5P_DEFAULT);
+    verify_dset_create_and_open_through_extlink_with_sohm(H5P_DEFAULT, fcpl_id);
+    verify_dset_create_and_open_through_extlink_with_sohm(fcpl_id, fcpl_id);
 
     ret = H5Pclose(fcpl_id);
     CHECK_I(ret, "H5Pclose");
-}
+} /* test_sohm_extlink */
 
 
 /*-------------------------------------------------------------------------
- * Function:    test_sohm_extend_dset_helper
+ * Function:    verify_dataset_extension
  *
  * Purpose:     Tests extending a dataset's dataspace when sharing is
  *              enabled.
@@ -3223,7 +3328,7 @@ test_sohm_extlink(void)
  *-------------------------------------------------------------------------
  */
 static int
-test_sohm_extend_dset_helper(hid_t fcpl_id, hbool_t close_reopen)
+verify_dataset_extension(hid_t fcpl_id, hbool_t close_reopen)
 {
     hid_t file_id = -1;
     hid_t orig_space_id = -1;
@@ -3236,13 +3341,98 @@ test_sohm_extend_dset_helper(hid_t fcpl_id, hbool_t close_reopen)
     hsize_t out_dims[2];
     hsize_t out_maxdims[2];
     int x;
-    int old_nerrs;              /* Number of errors when entering this routine */
+    int old_nerrs;           /* Number of errors when entering this routine */
     herr_t ret;
 
-    /* Retrieve the current # of reported errors */
+    hsize_t *space_dims[3];
+
+/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+ * Macro:      TSOHM_VDE_VERIFY_SPACES
+ *
+ * Purpose:    Encapsulate a common pattern
+ *             Open, read-verify, and close the dataspaces for datasets 1-3
+ *
+ * Programmer: Jacob Smith
+ *             2018 November 5
+ * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+ */
+#define TSOHM_VDE_VERIFY_SPACES(dims)                                     \
+{                                                                         \
+    /* Open dataspaces                                                    \
+     */                                                                   \
+    space1_id = H5Dget_space(dset1_id);                                   \
+    CHECK_I(space1_id, "H5Dget_space");                                   \
+    space2_id = H5Dget_space(dset2_id);                                   \
+    CHECK_I(space2_id, "H5Dget_space");                                   \
+    space3_id = H5Dget_space(dset3_id);                                   \
+    CHECK_I(space3_id, "H5Dget_space");                                   \
+    /* Verify dataspaces                                                  \
+     */                                                                   \
+    ret = H5Sget_simple_extent_dims(space1_id, out_dims, out_maxdims);    \
+    CHECK_I(ret, "H5Sget_simple_extent_dims");                            \
+    for(x=0; x<EXTEND_NDIMS; ++x) {                                       \
+        VERIFY(out_dims[x], (dims)[0][x], "H5Sget_simple_extent_dims");   \
+        VERIFY(out_maxdims[x], max_dims[x], "H5Sget_simple_extent_dims"); \
+    }                                                                     \
+    ret = H5Sget_simple_extent_dims(space2_id, out_dims, out_maxdims);    \
+    CHECK_I(ret, "H5Sget_simple_extent_dims");                            \
+    for(x=0; x<EXTEND_NDIMS; ++x) {                                       \
+        VERIFY(out_dims[x], (dims)[1][x], "H5Sget_simple_extent_dims");   \
+        VERIFY(out_maxdims[x], max_dims[x], "H5Sget_simple_extent_dims"); \
+    }                                                                     \
+    ret = H5Sget_simple_extent_dims(space3_id, out_dims, out_maxdims);    \
+    CHECK_I(ret, "H5Sget_simple_extent_dims");                            \
+    for(x=0; x<EXTEND_NDIMS; ++x) {                                       \
+        VERIFY(out_dims[x], (dims)[2][x], "H5Sget_simple_extent_dims");   \
+        VERIFY(out_maxdims[x], max_dims[x], "H5Sget_simple_extent_dims"); \
+    }                                                                     \
+    /* Close dataspaces                                                   \
+     */                                                                   \
+    CHECK_I(H5Sclose(space1_id), "H5Sclose");                             \
+    CHECK_I(H5Sclose(space2_id), "H5Sclose");                             \
+    CHECK_I(H5Sclose(space3_id), "H5Sclose");                             \
+} /* define TSOHM_VDE_VERIFY_SPACES */
+
+/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+ * Macro:      TSOHM_VDE_CLOSE_REOPEN_FILE_AND_DSETS()
+ *
+ * Purpose:    Encapsulate a common pattern
+ *             Wrapper to close and reopen file and datasets:
+ *                + "dataset" (dset_id)
+ *                + if n > 1 then include "dataset2" (dset_id2)
+ *                + if n > 2 then include "dataset3" (dset_id3)
+ *                + file (file_id)
+ *
+ * Programmer: Jacob Smith
+ *             2018 November 5
+ * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+ */
+#define TSOHM_VDE_CLOSE_REOPEN_FILE_AND_DSETS(n)               \
+{                                                              \
+    CHECK_I(H5Dclose(dset1_id), "H5Dclose");                   \
+    if ((n) > 1)                                               \
+        CHECK_I(H5Dclose(dset2_id), "H5Dclose");               \
+    if ((n) > 2)                                               \
+        CHECK_I(H5Dclose(dset3_id), "H5Dclose");               \
+    CHECK_I(H5Fclose(file_id), "H5Fclose");                    \
+                                                               \
+    file_id = H5Fopen(FILENAME, H5F_ACC_RDWR, H5P_DEFAULT);    \
+    CHECK_I(file_id, "H5Fopen");                               \
+    dset1_id = H5Dopen2(file_id, "dataset", H5P_DEFAULT);      \
+    CHECK_I(dset1_id, "H5Dopen2");                             \
+    if ((n) > 1) {                                             \
+        dset2_id = H5Dopen2(file_id, "dataset2", H5P_DEFAULT); \
+        CHECK_I(dset2_id, "H5Dopen2");                         \
+    }                                                          \
+    if ((n) > 2) {                                             \
+        dset3_id = H5Dopen2(file_id, "dataset3", H5P_DEFAULT); \
+        CHECK_I(dset3_id, "H5Dopen2");                         \
+    }                                                          \
+} /* define TSOHM_VDE_CLOSE_REOPEN_FILE_AND_DSETS */
+
+    /* Remember the current # of reported errors */
     old_nerrs = GetTestNumErrs();
 
-    /* Create file */
     file_id = H5Fcreate(FILENAME, H5F_ACC_TRUNC, fcpl_id, H5P_DEFAULT);
     CHECK_I(file_id, "H5Fcreate");
 
@@ -3257,251 +3447,49 @@ test_sohm_extend_dset_helper(hid_t fcpl_id, hbool_t close_reopen)
     CHECK_I(orig_space_id, "H5Screate_simple");
     dset1_id = H5Dcreate2(file_id, "dataset", H5T_NATIVE_LONG, orig_space_id, H5P_DEFAULT, dcpl_id, H5P_DEFAULT);
     CHECK_I(dset1_id, "H5Dcreate2");
-
-    if(close_reopen) {
-        /* If requested, close all open IDs and reopen them */
-        ret = H5Dclose(dset1_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Fclose(file_id);
-        CHECK_I(ret, "H5Fclose");
-
-        file_id = H5Fopen(FILENAME, H5F_ACC_RDWR, H5P_DEFAULT);
-        CHECK_I(file_id, "H5Fopen");
-        dset1_id = H5Dopen2(file_id, "dataset", H5P_DEFAULT);
-        CHECK_I(dset1_id, "H5Dopen2");
-    }
+    if(close_reopen)
+        TSOHM_VDE_CLOSE_REOPEN_FILE_AND_DSETS(1);
 
     /* Create another dataset starting with the same dataspace */
     dset2_id = H5Dcreate2(file_id, "dataset2", H5T_NATIVE_LONG, orig_space_id, H5P_DEFAULT, dcpl_id, H5P_DEFAULT);
     CHECK_I(dset2_id, "H5Dcreate2");
-
-    if(close_reopen) {
-        /* If requested, close all open IDs and reopen them */
-        ret = H5Dclose(dset1_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Dclose(dset2_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Fclose(file_id);
-        CHECK_I(ret, "H5Fclose");
-
-        file_id = H5Fopen(FILENAME, H5F_ACC_RDWR, H5P_DEFAULT);
-        CHECK_I(file_id, "H5Fopen");
-        dset1_id = H5Dopen2(file_id, "dataset", H5P_DEFAULT);
-        CHECK_I(dset1_id, "H5Dopen2");
-        dset2_id = H5Dopen2(file_id, "dataset2", H5P_DEFAULT);
-        CHECK_I(dset2_id, "H5Dopen2");
-    }
+    if (close_reopen)
+        TSOHM_VDE_CLOSE_REOPEN_FILE_AND_DSETS(2);
 
     /* Create a third dataset with the same dataspace */
     dset3_id = H5Dcreate2(file_id, "dataset3", H5T_NATIVE_LONG, orig_space_id, H5P_DEFAULT, dcpl_id, H5P_DEFAULT);
     CHECK_I(dset3_id, "H5Dcreate2");
-
-    if(close_reopen) {
-        /* If requested, close all open IDs and reopen them */
-        ret = H5Dclose(dset1_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Dclose(dset2_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Dclose(dset3_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Fclose(file_id);
-        CHECK_I(ret, "H5Fclose");
-
-        file_id = H5Fopen(FILENAME, H5F_ACC_RDWR, H5P_DEFAULT);
-        CHECK_I(file_id, "H5Fopen");
-        dset1_id = H5Dopen2(file_id, "dataset", H5P_DEFAULT);
-        CHECK_I(dset1_id, "H5Dopen2");
-        dset2_id = H5Dopen2(file_id, "dataset2", H5P_DEFAULT);
-        CHECK_I(dset2_id, "H5Dopen2");
-        dset3_id = H5Dopen2(file_id, "dataset3", H5P_DEFAULT);
-        CHECK_I(dset3_id, "H5Dopen2");
-    }
+    if (close_reopen)
+        TSOHM_VDE_CLOSE_REOPEN_FILE_AND_DSETS(3);
 
     /* Extend the first dataset */
     ret = H5Dset_extent(dset1_id, dims2);
     CHECK_I(ret, "H5Dset_extent");
-    if(close_reopen) {
-        /* If requested, close all open IDs and reopen them */
-        ret = H5Dclose(dset1_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Dclose(dset2_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Dclose(dset3_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Fclose(file_id);
-        CHECK_I(ret, "H5Fclose");
-
-        file_id = H5Fopen(FILENAME, H5F_ACC_RDWR, H5P_DEFAULT);
-        CHECK_I(file_id, "H5Fopen");
-        dset1_id = H5Dopen2(file_id, "dataset", H5P_DEFAULT);
-        CHECK_I(dset1_id, "H5Dopen2");
-        dset2_id = H5Dopen2(file_id, "dataset2", H5P_DEFAULT);
-        CHECK_I(dset2_id, "H5Dopen2");
-        dset3_id = H5Dopen2(file_id, "dataset3", H5P_DEFAULT);
-        CHECK_I(dset3_id, "H5Dopen2");
-    }
+    if (close_reopen)
+        TSOHM_VDE_CLOSE_REOPEN_FILE_AND_DSETS(3);
 
-    /* Get the dataspaces from the datasets */
-    space1_id = H5Dget_space(dset1_id);
-    CHECK_I(space1_id, "H5Dget_space");
-    space2_id = H5Dget_space(dset2_id);
-    CHECK_I(space2_id, "H5Dget_space");
-    space3_id = H5Dget_space(dset3_id);
-    CHECK_I(space3_id, "H5Dget_space");
-
-    /* Verify the dataspaces */
-    ret = H5Sget_simple_extent_dims(space1_id, out_dims, out_maxdims);
-    CHECK_I(ret, "H5Sget_simple_extent_dims");
-    for(x=0; x<EXTEND_NDIMS; ++x) {
-        VERIFY(out_dims[x], dims2[x], "H5Sget_simple_extent_dims");
-        VERIFY(out_maxdims[x], max_dims[x], "H5Sget_simple_extent_dims");
-    }
-
-    ret = H5Sget_simple_extent_dims(space2_id, out_dims, out_maxdims);
-    CHECK_I(ret, "H5Sget_simple_extent_dims");
-    for(x=0; x<EXTEND_NDIMS; ++x) {
-        VERIFY(out_dims[x], dims1[x], "H5Sget_simple_extent_dims");
-        VERIFY(out_maxdims[x], max_dims[x], "H5Sget_simple_extent_dims");
-    }
-
-    ret = H5Sget_simple_extent_dims(space3_id, out_dims, out_maxdims);
-    CHECK_I(ret, "H5Sget_simple_extent_dims");
-    for(x=0; x<EXTEND_NDIMS; ++x) {
-        VERIFY(out_dims[x], dims1[x], "H5Sget_simple_extent_dims");
-        VERIFY(out_maxdims[x], max_dims[x], "H5Sget_simple_extent_dims");
-    }
-
-    /* Close all three dataspaces */
-    ret = H5Sclose(space1_id);
-    CHECK_I(ret, "H5Sclose");
-    ret = H5Sclose(space2_id);
-    CHECK_I(ret, "H5Sclose");
-    ret = H5Sclose(space3_id);
-    CHECK_I(ret, "H5Sclose");
+    space_dims[0] = dims2;
+    space_dims[1] = dims1;
+    space_dims[2] = dims1;
+    TSOHM_VDE_VERIFY_SPACES(space_dims);
 
     /* Extend the second dataset */
     ret = H5Dset_extent(dset2_id, dims2);
     CHECK_I(ret, "H5Dset_extent");
-    if(close_reopen) {
-        /* If requested, close all open IDs and reopen them */
-        ret = H5Dclose(dset1_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Dclose(dset2_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Dclose(dset3_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Fclose(file_id);
-        CHECK_I(ret, "H5Fclose");
-
-        file_id = H5Fopen(FILENAME, H5F_ACC_RDWR, H5P_DEFAULT);
-        CHECK_I(file_id, "H5Fopen");
-        dset1_id = H5Dopen2(file_id, "dataset", H5P_DEFAULT);
-        CHECK_I(dset1_id, "H5Dopen2");
-        dset2_id = H5Dopen2(file_id, "dataset2", H5P_DEFAULT);
-        CHECK_I(dset2_id, "H5Dopen2");
-        dset3_id = H5Dopen2(file_id, "dataset3", H5P_DEFAULT);
-        CHECK_I(dset3_id, "H5Dopen2");
-    }
-
-    /* Get the dataspaces from the datasets */
-    space1_id = H5Dget_space(dset1_id);
-    CHECK_I(space1_id, "H5Dget_space");
-    space2_id = H5Dget_space(dset2_id);
-    CHECK_I(space2_id, "H5Dget_space");
-    space3_id = H5Dget_space(dset3_id);
-    CHECK_I(space3_id, "H5Dget_space");
-
-    /* Verify the dataspaces */
-    ret = H5Sget_simple_extent_dims(space1_id, out_dims, out_maxdims);
-    CHECK_I(ret, "H5Sget_simple_extent_dims");
-    for(x=0; x<EXTEND_NDIMS; ++x) {
-        VERIFY(out_dims[x], dims2[x], "H5Sget_simple_extent_dims");
-        VERIFY(out_maxdims[x], max_dims[x], "H5Sget_simple_extent_dims");
-    }
-
-    ret = H5Sget_simple_extent_dims(space2_id, out_dims, out_maxdims);
-    CHECK_I(ret, "H5Sget_simple_extent_dims");
-    for(x=0; x<EXTEND_NDIMS; ++x) {
-        VERIFY(out_dims[x], dims2[x], "H5Sget_simple_extent_dims");
-        VERIFY(out_maxdims[x], max_dims[x], "H5Sget_simple_extent_dims");
-    }
+    if(close_reopen)
+        TSOHM_VDE_CLOSE_REOPEN_FILE_AND_DSETS(3);
 
-    ret = H5Sget_simple_extent_dims(space3_id, out_dims, out_maxdims);
-    CHECK_I(ret, "H5Sget_simple_extent_dims");
-    for(x=0; x<EXTEND_NDIMS; ++x) {
-        VERIFY(out_dims[x], dims1[x], "H5Sget_simple_extent_dims");
-        VERIFY(out_maxdims[x], max_dims[x], "H5Sget_simple_extent_dims");
-    }
-
-    /* Close all three dataspaces */
-    ret = H5Sclose(space1_id);
-    CHECK_I(ret, "H5Sclose");
-    ret = H5Sclose(space2_id);
-    CHECK_I(ret, "H5Sclose");
-    ret = H5Sclose(space3_id);
-    CHECK_I(ret, "H5Sclose");
+    space_dims[1] = dims2;
+    TSOHM_VDE_VERIFY_SPACES(space_dims);
 
     /* Extend the third dataset */
     ret = H5Dset_extent(dset3_id, dims2);
     CHECK_I(ret, "H5Dset_extent");
-    if(close_reopen) {
-        /* If requested, close all open IDs and reopen them */
-        ret = H5Dclose(dset1_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Dclose(dset2_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Dclose(dset3_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Fclose(file_id);
-        CHECK_I(ret, "H5Fclose");
-
-        file_id = H5Fopen(FILENAME, H5F_ACC_RDWR, H5P_DEFAULT);
-        CHECK_I(file_id, "H5Fopen");
-        dset1_id = H5Dopen2(file_id, "dataset", H5P_DEFAULT);
-        CHECK_I(dset1_id, "H5Dopen2");
-        dset2_id = H5Dopen2(file_id, "dataset2", H5P_DEFAULT);
-        CHECK_I(dset2_id, "H5Dopen2");
-        dset3_id = H5Dopen2(file_id, "dataset3", H5P_DEFAULT);
-        CHECK_I(dset3_id, "H5Dopen2");
-    }
-
-    /* Get the dataspaces from the datasets */
-    space1_id = H5Dget_space(dset1_id);
-    CHECK_I(space1_id, "H5Dget_space");
-    space2_id = H5Dget_space(dset2_id);
-    CHECK_I(space2_id, "H5Dget_space");
-    space3_id = H5Dget_space(dset3_id);
-    CHECK_I(space3_id, "H5Dget_space");
-
-    /* Verify the dataspaces */
-    ret = H5Sget_simple_extent_dims(space1_id, out_dims, out_maxdims);
-    CHECK_I(ret, "H5Sget_simple_extent_dims");
-    for(x=0; x<EXTEND_NDIMS; ++x) {
-        VERIFY(out_dims[x], dims2[x], "H5Sget_simple_extent_dims");
-        VERIFY(out_maxdims[x], max_dims[x], "H5Sget_simple_extent_dims");
-    }
-
-    ret = H5Sget_simple_extent_dims(space2_id, out_dims, out_maxdims);
-    CHECK_I(ret, "H5Sget_simple_extent_dims");
-    for(x=0; x<EXTEND_NDIMS; ++x) {
-        VERIFY(out_dims[x], dims2[x], "H5Sget_simple_extent_dims");
-        VERIFY(out_maxdims[x], max_dims[x], "H5Sget_simple_extent_dims");
-    }
-
-    ret = H5Sget_simple_extent_dims(space3_id, out_dims, out_maxdims);
-    CHECK_I(ret, "H5Sget_simple_extent_dims");
-    for(x=0; x<EXTEND_NDIMS; ++x) {
-        VERIFY(out_dims[x], dims2[x], "H5Sget_simple_extent_dims");
-        VERIFY(out_maxdims[x], max_dims[x], "H5Sget_simple_extent_dims");
-    }
+    if(close_reopen)
+        TSOHM_VDE_CLOSE_REOPEN_FILE_AND_DSETS(3);
 
-    /* Close all three dataspaces */
-    ret = H5Sclose(space1_id);
-    CHECK_I(ret, "H5Sclose");
-    ret = H5Sclose(space2_id);
-    CHECK_I(ret, "H5Sclose");
-    ret = H5Sclose(space3_id);
-    CHECK_I(ret, "H5Sclose");
+    space_dims[2] = dims2;
+    TSOHM_VDE_VERIFY_SPACES(space_dims);
 
     /* Close the datasets and file */
     ret = H5Dclose(dset1_id);
@@ -3523,164 +3511,44 @@ test_sohm_extend_dset_helper(hid_t fcpl_id, hbool_t close_reopen)
     CHECK_I(file_id, "H5Fcreate");
     dset1_id = H5Dcreate2(file_id, "dataset", H5T_NATIVE_LONG, orig_space_id, H5P_DEFAULT, dcpl_id, H5P_DEFAULT);
     CHECK_I(dset1_id, "H5Dcreate2");
-    if(close_reopen) {
-        /* If requested, close all open IDs and reopen them */
-        ret = H5Dclose(dset1_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Fclose(file_id);
-        CHECK_I(ret, "H5Fclose");
-
-        file_id = H5Fopen(FILENAME, H5F_ACC_RDWR, H5P_DEFAULT);
-        CHECK_I(file_id, "H5Fopen");
-        dset1_id = H5Dopen2(file_id, "dataset", H5P_DEFAULT);
-        CHECK_I(dset1_id, "H5Dopen2");
-    }
+    if (close_reopen)
+        TSOHM_VDE_CLOSE_REOPEN_FILE_AND_DSETS(1);
 
     /* Extend the first dataset */
     ret = H5Dset_extent(dset1_id, dims2);
     CHECK_I(ret, "H5Dset_extent");
-    if(close_reopen) {
-        /* If requested, close all open IDs and reopen them */
-        ret = H5Dclose(dset1_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Fclose(file_id);
-        CHECK_I(ret, "H5Fclose");
-
-        file_id = H5Fopen(FILENAME, H5F_ACC_RDWR, H5P_DEFAULT);
-        CHECK_I(file_id, "H5Fopen");
-        dset1_id = H5Dopen2(file_id, "dataset", H5P_DEFAULT);
-        CHECK_I(dset1_id, "H5Dopen2");
-    }
+    if (close_reopen)
+        TSOHM_VDE_CLOSE_REOPEN_FILE_AND_DSETS(1);
 
     /* Create the second dataset.  Its dataspace will be unshared and then
      * become shared when extended.
      */
     dset2_id = H5Dcreate2(file_id, "dataset2", H5T_NATIVE_LONG, orig_space_id, H5P_DEFAULT, dcpl_id, H5P_DEFAULT);
     CHECK_I(dset2_id, "H5Dcreate2");
-    if(close_reopen) {
-        /* If requested, close all open IDs and reopen them */
-        ret = H5Dclose(dset1_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Dclose(dset2_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Fclose(file_id);
-        CHECK_I(ret, "H5Fclose");
-
-        file_id = H5Fopen(FILENAME, H5F_ACC_RDWR, H5P_DEFAULT);
-        CHECK_I(file_id, "H5Fopen");
-        dset1_id = H5Dopen2(file_id, "dataset", H5P_DEFAULT);
-        CHECK_I(dset1_id, "H5Dopen2");
-        dset2_id = H5Dopen2(file_id, "dataset2", H5P_DEFAULT);
-        CHECK_I(dset2_id, "H5Dopen2");
-    }
+    if (close_reopen)
+        TSOHM_VDE_CLOSE_REOPEN_FILE_AND_DSETS(2);
 
     /* Extend the second dataset */
     ret = H5Dset_extent(dset2_id, dims2);
     CHECK_I(ret, "H5Dset_extent");
-    if(close_reopen) {
-        /* If requested, close all open IDs and reopen them */
-        ret = H5Dclose(dset1_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Dclose(dset2_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Fclose(file_id);
-        CHECK_I(ret, "H5Fclose");
-
-        file_id = H5Fopen(FILENAME, H5F_ACC_RDWR, H5P_DEFAULT);
-        CHECK_I(file_id, "H5Fopen");
-        dset1_id = H5Dopen2(file_id, "dataset", H5P_DEFAULT);
-        CHECK_I(dset1_id, "H5Dopen2");
-        dset2_id = H5Dopen2(file_id, "dataset2", H5P_DEFAULT);
-        CHECK_I(dset2_id, "H5Dopen2");
-    }
+    if (close_reopen)
+        TSOHM_VDE_CLOSE_REOPEN_FILE_AND_DSETS(2);
 
     /* Create the third dataset.  Its dataspace will be unshared and then
      * become shared when extended.
      */
     dset3_id = H5Dcreate2(file_id, "dataset3", H5T_NATIVE_LONG, orig_space_id, H5P_DEFAULT, dcpl_id, H5P_DEFAULT);
     CHECK_I(dset3_id, "H5Dcreate2");
-    if(close_reopen) {
-        /* If requested, close all open IDs and reopen them */
-        ret = H5Dclose(dset1_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Dclose(dset2_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Dclose(dset3_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Fclose(file_id);
-        CHECK_I(ret, "H5Fclose");
-
-        file_id = H5Fopen(FILENAME, H5F_ACC_RDWR, H5P_DEFAULT);
-        CHECK_I(file_id, "H5Fopen");
-        dset1_id = H5Dopen2(file_id, "dataset", H5P_DEFAULT);
-        CHECK_I(dset1_id, "H5Dopen2");
-        dset2_id = H5Dopen2(file_id, "dataset2", H5P_DEFAULT);
-        CHECK_I(dset2_id, "H5Dopen2");
-        dset3_id = H5Dopen2(file_id, "dataset3", H5P_DEFAULT);
-        CHECK_I(dset3_id, "H5Dopen2");
-    }
+    if(close_reopen)
+        TSOHM_VDE_CLOSE_REOPEN_FILE_AND_DSETS(3);
 
     /* Extend the third dataset */
     ret = H5Dset_extent(dset3_id, dims2);
     CHECK_I(ret, "H5Dset_extent");
-    if(close_reopen) {
-        /* If requested, close all open IDs and reopen them */
-        ret = H5Dclose(dset1_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Dclose(dset2_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Dclose(dset3_id);
-        CHECK_I(ret, "H5Dclose");
-        ret = H5Fclose(file_id);
-        CHECK_I(ret, "H5Fclose");
-
-        file_id = H5Fopen(FILENAME, H5F_ACC_RDWR, H5P_DEFAULT);
-        CHECK_I(file_id, "H5Fopen");
-        dset1_id = H5Dopen2(file_id, "dataset", H5P_DEFAULT);
-        CHECK_I(dset1_id, "H5Dopen2");
-        dset2_id = H5Dopen2(file_id, "dataset2", H5P_DEFAULT);
-        CHECK_I(dset2_id, "H5Dopen2");
-        dset3_id = H5Dopen2(file_id, "dataset3", H5P_DEFAULT);
-        CHECK_I(dset3_id, "H5Dopen2");
-    }
+    if(close_reopen)
+        TSOHM_VDE_CLOSE_REOPEN_FILE_AND_DSETS(3);
 
-    /* Get the dataspaces from the datasets */
-    space1_id = H5Dget_space(dset1_id);
-    CHECK_I(space1_id, "H5Dget_space");
-    space2_id = H5Dget_space(dset2_id);
-    CHECK_I(space2_id, "H5Dget_space");
-    space3_id = H5Dget_space(dset3_id);
-    CHECK_I(space3_id, "H5Dget_space");
-
-    /* Verify the dataspaces */
-    ret = H5Sget_simple_extent_dims(space1_id, out_dims, out_maxdims);
-    CHECK_I(ret, "H5Sget_simple_extent_dims");
-    for(x=0; x<EXTEND_NDIMS; ++x) {
-        VERIFY(out_dims[x], dims2[x], "H5Sget_simple_extent_dims");
-        VERIFY(out_maxdims[x], max_dims[x], "H5Sget_simple_extent_dims");
-    }
-
-    ret = H5Sget_simple_extent_dims(space2_id, out_dims, out_maxdims);
-    CHECK_I(ret, "H5Sget_simple_extent_dims");
-    for(x=0; x<EXTEND_NDIMS; ++x) {
-        VERIFY(out_dims[x], dims2[x], "H5Sget_simple_extent_dims");
-        VERIFY(out_maxdims[x], max_dims[x], "H5Sget_simple_extent_dims");
-    }
-
-    ret = H5Sget_simple_extent_dims(space3_id, out_dims, out_maxdims);
-    CHECK_I(ret, "H5Sget_simple_extent_dims");
-    for(x=0; x<EXTEND_NDIMS; ++x) {
-        VERIFY(out_dims[x], dims2[x], "H5Sget_simple_extent_dims");
-        VERIFY(out_maxdims[x], max_dims[x], "H5Sget_simple_extent_dims");
-    }
-
-    /* Close all three dataspaces */
-    ret = H5Sclose(space1_id);
-    CHECK_I(ret, "H5Sclose");
-    ret = H5Sclose(space2_id);
-    CHECK_I(ret, "H5Sclose");
-    ret = H5Sclose(space3_id);
-    CHECK_I(ret, "H5Sclose");
+    TSOHM_VDE_VERIFY_SPACES(space_dims);
 
     /* Close the datasets and file */
     ret = H5Dclose(dset1_id);
@@ -3698,12 +3566,15 @@ test_sohm_extend_dset_helper(hid_t fcpl_id, hbool_t close_reopen)
     ret = H5Pclose(dcpl_id);
     CHECK_I(ret, "H5Pclose");
 
-    /* Retrieve current # of errors */
+    /* Complain if this test generated errors */
     if(old_nerrs == GetTestNumErrs())
         return(0);
     else
         return(-1);
-} /* end test_sohm_extend_dset_helper() */
+/* macros are exclusive to this function */
+#undef TSOHM_VDE_CLOSE_REOPEN_FILE_AND_DSETS
+#undef TSOHM_VDE_VERIFY_SPACES
+} /* verify_dataset_extension */
 
 
 /*-------------------------------------------------------------------------
@@ -3726,74 +3597,71 @@ test_sohm_extend_dset(void)
     hid_t fcpl_id = -1;
     herr_t ret;
 
-    /* Create fcpl */
+    MESSAGE(5, ("Testing extending shared dataspaces\n"));
+
     fcpl_id = H5Pcreate(H5P_FILE_CREATE);
     CHECK_I(fcpl_id, "H5Pcreate");
-
-    /* Test extending datasets with different FCPLs */
     ret = H5Pset_shared_mesg_nindexes(fcpl_id, 1);
     CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
 
     /* No shared messages */
-    ret = test_sohm_extend_dset_helper(fcpl_id, FALSE);
-    CHECK_I(ret, "test_sohm_extend_dset_helper");
-    ret = test_sohm_extend_dset_helper(fcpl_id, TRUE);
-    CHECK_I(ret, "test_sohm_extend_dset_helper");
+    ret = verify_dataset_extension(fcpl_id, FALSE);
+    CHECK_I(ret, "verify_dataset_extension");
+    ret = verify_dataset_extension(fcpl_id, TRUE);
+    CHECK_I(ret, "verify_dataset_extension");
 
 
     /* Only dataspaces */
     ret = H5Pset_shared_mesg_index(fcpl_id, 0, H5O_SHMESG_SDSPACE_FLAG, 16);
     CHECK_I(ret, "H5Pset_shared_mesg_index");
 
-    ret = test_sohm_extend_dset_helper(fcpl_id, FALSE);
-    CHECK_I(ret, "test_sohm_extend_dset_helper");
-    ret = test_sohm_extend_dset_helper(fcpl_id, TRUE);
-    CHECK_I(ret, "test_sohm_extend_dset_helper");
+    ret = verify_dataset_extension(fcpl_id, FALSE);
+    CHECK_I(ret, "verify_dataset_extension");
+    ret = verify_dataset_extension(fcpl_id, TRUE);
+    CHECK_I(ret, "verify_dataset_extension");
 
     /* All messages */
-    ret = H5Pset_shared_mesg_nindexes(fcpl_id, 1);
-    CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
     ret = H5Pset_shared_mesg_index(fcpl_id, 0, H5O_SHMESG_ALL_FLAG, 16);
     CHECK_I(ret, "H5Pset_shared_mesg_index");
 
-    ret = test_sohm_extend_dset_helper(fcpl_id, FALSE);
-    CHECK_I(ret, "test_sohm_extend_dset_helper");
-    ret = test_sohm_extend_dset_helper(fcpl_id, TRUE);
-    CHECK_I(ret, "test_sohm_extend_dset_helper");
+    ret = verify_dataset_extension(fcpl_id, FALSE);
+    CHECK_I(ret, "verify_dataset_extension");
+    ret = verify_dataset_extension(fcpl_id, TRUE);
+    CHECK_I(ret, "verify_dataset_extension");
 
 
     /* All messages in lists */
     ret = H5Pset_shared_mesg_phase_change(fcpl_id, 100, 50);
     CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
 
-    ret = test_sohm_extend_dset_helper(fcpl_id, FALSE);
-    CHECK_I(ret, "test_sohm_extend_dset_helper");
-    ret = test_sohm_extend_dset_helper(fcpl_id, TRUE);
-    CHECK_I(ret, "test_sohm_extend_dset_helper");
+    ret = verify_dataset_extension(fcpl_id, FALSE);
+    CHECK_I(ret, "verify_dataset_extension");
+    ret = verify_dataset_extension(fcpl_id, TRUE);
+    CHECK_I(ret, "verify_dataset_extension");
 
 
     /* All messages in lists converted to B-trees */
     ret = H5Pset_shared_mesg_phase_change(fcpl_id, 1, 0);
     CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
 
-    ret = test_sohm_extend_dset_helper(fcpl_id, FALSE);
-    CHECK_I(ret, "test_sohm_extend_dset_helper");
-    ret = test_sohm_extend_dset_helper(fcpl_id, TRUE);
-    CHECK_I(ret, "test_sohm_extend_dset_helper");
+    ret = verify_dataset_extension(fcpl_id, FALSE);
+    CHECK_I(ret, "verify_dataset_extension");
+    ret = verify_dataset_extension(fcpl_id, TRUE);
+    CHECK_I(ret, "verify_dataset_extension");
 
 
     /* All messages in B-trees */
     ret = H5Pset_shared_mesg_phase_change(fcpl_id, 0, 0);
     CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
 
-    ret = test_sohm_extend_dset_helper(fcpl_id, FALSE);
-    CHECK_I(ret, "test_sohm_extend_dset_helper");
-    ret = test_sohm_extend_dset_helper(fcpl_id, TRUE);
-    CHECK_I(ret, "test_sohm_extend_dset_helper");
+    ret = verify_dataset_extension(fcpl_id, FALSE);
+    CHECK_I(ret, "verify_dataset_extension");
+    ret = verify_dataset_extension(fcpl_id, TRUE);
+    CHECK_I(ret, "verify_dataset_extension");
 
     ret = H5Pclose(fcpl_id);
     CHECK_I(ret, "H5Pclose");
-}
+} /* test_sohm_extend_dset */
 
 
 /*-------------------------------------------------------------------------
@@ -3827,37 +3695,31 @@ test_sohm_external_dtype(void)
     unsigned x, i;
     herr_t ret;
 
+    MESSAGE(5, ("Testing shared external datatype\n"));
+
     fcpl = H5Pcreate(H5P_FILE_CREATE);
     CHECK_I(fcpl, "H5Pcreate");
-
-    /* Set up index values for sohm */
     ret = H5Pset_shared_mesg_nindexes(fcpl, TEST_NUM_INDEXES);
     CHECK_I(ret, "H5Pset_shared_mesg_nindexes");
-
-    for(x=0; x<TEST_NUM_INDEXES; ++x)
-    {
+    for(x=0; x<TEST_NUM_INDEXES; ++x) {
         ret = H5Pset_shared_mesg_index(fcpl, x, test_type_flags[x], test_minsizes[x]);
         CHECK_I(ret, "H5Pset_shared_mesg_index");
     }
-
     ret = H5Pset_shared_mesg_phase_change(fcpl, TEST_L2B, TEST_B2L);
     CHECK_I(ret, "H5Pset_shared_mesg_phase_change");
 
-    /* Create the data space */
     space = H5Screate_simple(2, dims, NULL);
     CHECK_I(space, "H5Screate_simple");
 
-    /* Create a data type for s1_t */
     s1_tid = H5Tcreate(H5T_COMPOUND, sizeof(s1_t));
     CHECK_I(s1_tid, "H5Tcreate");
-
     ret = H5Tinsert(s1_tid, "a", HOFFSET(s1_t,a), H5T_NATIVE_INT);
     CHECK_I(ret, "H5Tinsert");
-
     ret = H5Tinsert (s1_tid, "b", HOFFSET(s1_t,b), H5T_NATIVE_INT);
     CHECK_I(ret, "H5Tinsert");
 
-    /* Create the first file for this test */
+    /* Set up dataset in first file
+     */
     file1 = H5Fcreate(FILENAME_SRC, H5F_ACC_TRUNC, fcpl, H5P_DEFAULT);
     CHECK_I(file1, "H5Fcreate");
 
@@ -3866,7 +3728,6 @@ test_sohm_external_dtype(void)
     CHECK(ret, FAIL, "H5F__get_sohm_mesg_count_test");
     VERIFY(dmsg_count, 0, "H5F__get_sohm_mesg_count_test");
 
-    /* Create data set */
     dataset1 = H5Dcreate2(file1, "dataset_1", s1_tid, space, H5P_DEFAULT, H5P_DEFAULT,
         H5P_DEFAULT);
     CHECK_I(dataset1, "H5Dcreate2");
@@ -3876,26 +3737,26 @@ test_sohm_external_dtype(void)
     CHECK(ret, FAIL, "H5F__get_sohm_mesg_count_test");
     VERIFY(dmsg_count, 1, "H5F__get_sohm_mesg_count_test");
 
-    /* Retieve the dataset's datatype */
     dset1_tid = H5Dget_type(dataset1);
     CHECK_I(dset1_tid, "H5Dget_type");
 
     /* Allocate space and initialize data */
     orig = (s1_t*)HDmalloc(NX * NY * sizeof(s1_t));
+    if (orig == NULL)
+        CHECK_I(-1, "HDmalloc");
     for(i=0; i<NX*NY; i++) {
         s_ptr = (s1_t*)orig + i;
         s_ptr->a = (int)(i * 3 + 1);
         s_ptr->b = (int)(i * 3 + 2);
     }
 
-    /* Write the data to the dataset1 */
     ret = H5Dwrite(dataset1, s1_tid, H5S_ALL, H5S_ALL, H5P_DEFAULT, orig);
     CHECK_I(ret, "H5Dwrite");
-
     ret = H5Dclose(dataset1);
     CHECK_I(ret, "H5Dclose");
 
-    /* Create the second file for this test */
+    /* Create dataset in second file using datatype from dataset in the first file
+     */
     file2 = H5Fcreate(FILENAME_DST, H5F_ACC_TRUNC, fcpl, H5P_DEFAULT);
     CHECK_I(file2, "H5Fcreate");
 
@@ -3904,7 +3765,6 @@ test_sohm_external_dtype(void)
     CHECK(ret, FAIL, "H5F__get_sohm_mesg_count_test");
     VERIFY(dmsg_count, 0, "H5F__get_sohm_mesg_count_test");
 
-    /* Create a data set using the datatype of the dataset in the first file. */
     dataset2 = H5Dcreate2(file2, "dataset_2", dset1_tid, space, H5P_DEFAULT, H5P_DEFAULT,
         H5P_DEFAULT);
     CHECK_I(dataset2, "H5Dcreate2");
@@ -3914,54 +3774,44 @@ test_sohm_external_dtype(void)
     CHECK(ret, FAIL, "H5F__get_sohm_mesg_count_test");
     VERIFY(dmsg_count, 1, "H5F__get_sohm_mesg_count_test");
 
-    /* Write the data to the dataset2 */
     ret = H5Dwrite(dataset2, s1_tid, H5S_ALL, H5S_ALL, H5P_DEFAULT, orig);
     CHECK_I(ret, "H5Dwrite");
 
+    /* Close references to the first file */
     ret = H5Dclose(dataset2);
     CHECK_I(ret, "H5Dclose");
-
-    /* Close file 1 and the dataset's datatype in file 1.  Verify that the datatype in
-     * file 2 is still accessible. */
     ret = H5Tclose(dset1_tid);
     CHECK_I(ret, "H5Tclose");
-
     ret = H5Fclose(file1);
     CHECK_I(ret, "H5Fclose");
 
-    /* Open the dataset in file 2 */
+    /* Verify that datatype details are still accessible by second file
+     */
     dataset2 = H5Dopen2(file2, "dataset_2", H5P_DEFAULT);
     CHECK_I(dataset2, "H5Dopen2");
 
-    /* Retieve the dataset's datatype */
     dset2_tid = H5Dget_type(dataset2);
     CHECK_I(dset2_tid, "H5Dget_type");
 
-    /* Verify the datatype is compound */
     dtype_class = H5Tget_class(dset2_tid);
     VERIFY(dtype_class, H5T_COMPOUND, "H5Tget_class");
 
+    /* Cleanup
+     */
     ret = H5Tclose(dset2_tid);
     CHECK_I(ret, "H5Tclose");
-
     ret = H5Dclose(dataset2);
     CHECK_I(ret, "H5Dclose");
-
-    /* Finishing test and release resources */
     ret = H5Sclose(space);
     CHECK_I(ret, "H5Sclose");
-
     ret = H5Tclose(s1_tid);
     CHECK_I(ret, "H5Tclose");
-
     ret = H5Pclose(fcpl);
     CHECK_I(ret, "H5Pclose");
-
     ret = H5Fclose(file2);
     CHECK_I(ret, "H5Fclose");
-
     HDfree(orig);
-}
+} /* test_sohm_external_dtype */
 
 
 /****************************************************************
@@ -3972,11 +3822,14 @@ test_sohm_external_dtype(void)
 void
 test_sohm(void)
 {
-    /* Output message about test being performed */
     MESSAGE(5, ("Testing Shared Object Header Messages\n"));
 
-    test_sohm_fcpl();		/* Test SOHMs and file creation plists */
+    test_sohm_fcpl();           /* Test SOHMs and file creation plists */
+    test_sohm_fcpl_errors();    /* Bogus H5P* calls for SOHMs */
     test_sohm_size1();          /* Tests the sizes of files with one SOHM */
+#if 0 /* TODO: REVEALS BUG TO BE FIXED - SEE JIRA HDFFV-10645 */
+    test_sohm_size_consistency_open_create();
+#endif /* Jira HDFFV-10645 */
     test_sohm_attrs();          /* Tests shared messages in attributes */
     test_sohm_size2(0);         /* Tests the sizes of files with multiple SOHMs */
     test_sohm_size2(1);         /* Tests the sizes of files with multiple
@@ -3989,17 +3842,17 @@ test_sohm(void)
 
     test_sohm_extend_dset();    /* Test extending shared datasets */
     test_sohm_external_dtype(); /* Test using datatype in another file */
-} /* test_sohm() */
+} /* test_sohm */
 
 
 /*-------------------------------------------------------------------------
- * Function:	cleanup_sohm
+ * Function:    cleanup_sohm
  *
- * Purpose:	Cleanup temporary test files
+ * Purpose:     Cleanup temporary test files
  *
- * Return:	none
+ * Return:      none
  *
- * Programmer:	James Laird
+ * Programmer:  James Laird
  *              October 9, 2006
  *
  * Modifications:
@@ -4012,5 +3865,5 @@ cleanup_sohm(void)
     remove(FILENAME);
     remove(FILENAME_SRC);
     remove(FILENAME_DST);
-}
+} /* cleanup_sohm */
 
diff --git a/test/tvlstr.c b/test/tvlstr.c
index 68d1070..da6195c 100644
--- a/test/tvlstr.c
+++ b/test/tvlstr.c
@@ -880,7 +880,7 @@ static void test_write_same_element(void)
     fspace = H5Screate_simple(SPACE1_RANK, fdim, NULL);
     CHECK(fspace, FAIL, "H5Screate_simple");
 
-    dataset1 = H5Dcreate(file1, DATASET, dtype, fspace, H5P_DEFAULT,
+    dataset1 = H5Dcreate2(file1, DATASET, dtype, fspace, H5P_DEFAULT,
                           H5P_DEFAULT, H5P_DEFAULT);
     CHECK(dataset1, FAIL, "H5Dcreate");
 
@@ -905,7 +905,7 @@ static void test_write_same_element(void)
     file1 = H5Fopen(DATAFILE3, H5F_ACC_RDWR, H5P_DEFAULT);
     CHECK(file1, FAIL, "H5Fopen");
 
-    dataset1 = H5Dopen(file1, DATASET, H5P_DEFAULT);
+    dataset1 = H5Dopen2(file1, DATASET, H5P_DEFAULT);
     CHECK(dataset1, FAIL, "H5Dopen");
 
     fspace = H5Dget_space(dataset1);
diff --git a/test/vol.c b/test/vol.c
index b70c0ca..c55874a 100644
--- a/test/vol.c
+++ b/test/vol.c
@@ -20,8 +20,12 @@
 
 #include "h5test.h"
 
+/* Filename */
+const char *FILENAME[] = {
+    "native_vol_test",
+    NULL
+};
 
-#define NATIVE_VOL_TEST_FILENAME        "native_vol_test"
 #define NATIVE_VOL_TEST_GROUP_NAME      "test_group"
 #define NATIVE_VOL_TEST_DATASET_NAME    "test_dataset"
 #define NATIVE_VOL_TEST_ATTRIBUTE_NAME  "test_dataset"
@@ -237,7 +241,7 @@ error:
  *-------------------------------------------------------------------------
  */
 static herr_t
-test_basic_file_operation(void)
+test_basic_file_operation(const char *env_h5_drvr)
 {
     hid_t fid           = H5I_INVALID_HID;
     hid_t fid_reopen    = H5I_INVALID_HID;
@@ -245,6 +249,7 @@ test_basic_file_operation(void)
     hid_t fapl_id2      = H5I_INVALID_HID;
     hid_t fcpl_id       = H5I_INVALID_HID;
 
+    char            filename[1024];
     ssize_t         obj_count;
     hid_t           obj_id_list[1];
     hsize_t         file_size;
@@ -257,6 +262,7 @@ test_basic_file_operation(void)
 
     /* Retrieve the file access property for testing */
     fapl_id = h5_fileaccess();
+    h5_fixname(FILENAME[0], fapl_id, filename, sizeof filename);
 
     /* Set the file close degree to a non-default value, to make the H5Pequal
      *  work out.  This is kinda odd, but the library's current behavior with
@@ -273,7 +279,7 @@ test_basic_file_operation(void)
         FAIL_STACK_ERROR
 
     /* H5Fcreate */
-    if ((fid = H5Fcreate(NATIVE_VOL_TEST_FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id)) < 0)
+    if ((fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id)) < 0)
         TEST_ERROR;
 
     /* H5Fget_obj_count */
@@ -290,13 +296,16 @@ test_basic_file_operation(void)
     if ((obj_count = H5Fget_obj_ids((hid_t)H5F_OBJ_ALL, H5F_OBJ_DATASET, 2, obj_id_list)) < 0)
         TEST_ERROR;
 
-    /* H5Fget_access_plist */
-    if ((fapl_id2 = H5Fget_access_plist(fid)) < 0)
-        TEST_ERROR;
-    if (H5Pequal(fapl_id, fapl_id2) != TRUE)
-        TEST_ERROR;
-    if (H5Pclose(fapl_id2) < 0)
-        TEST_ERROR;
+    /* Can't compare VFD properties for split / multi / family VFDs */
+    if((hbool_t)(HDstrcmp(env_h5_drvr, "split") && HDstrcmp(env_h5_drvr, "multi") && HDstrcmp(env_h5_drvr, "family"))) {
+        /* H5Fget_access_plist */
+        if ((fapl_id2 = H5Fget_access_plist(fid)) < 0)
+            TEST_ERROR;
+        if (H5Pequal(fapl_id, fapl_id2) != TRUE)
+            TEST_ERROR;
+        if (H5Pclose(fapl_id2) < 0)
+            TEST_ERROR;
+    } /* end if */
 
     /* H5Fget_create_plist */
     if ((fcpl_id = H5Fget_create_plist(fid)) < 0)
@@ -308,9 +317,12 @@ test_basic_file_operation(void)
     if (H5Fget_filesize(fid, &file_size) < 0)
         TEST_ERROR;
 
-    /* H5Fget_vfd_handle */
-    if (H5Fget_vfd_handle(fid, H5P_DEFAULT, &os_file_handle) < 0)
-        TEST_ERROR;
+    /* Can't retrieve VFD handle for split / multi / family VFDs */
+    if((hbool_t)(HDstrcmp(env_h5_drvr, "split") && HDstrcmp(env_h5_drvr, "multi") && HDstrcmp(env_h5_drvr, "family"))) {
+        /* H5Fget_vfd_handle */
+        if (H5Fget_vfd_handle(fid, H5P_DEFAULT, &os_file_handle) < 0)
+            TEST_ERROR;
+    } /* end if */
 
     /* H5Fget_intent */
     if (H5Fget_intent(fid, &intent) < 0)
@@ -337,43 +349,49 @@ test_basic_file_operation(void)
         TEST_ERROR;
 
     /* H5Fis_accessible */
-    if (H5Fis_accessible(NATIVE_VOL_TEST_FILENAME, fapl_id) < 0)
+    if (H5Fis_accessible(filename, fapl_id) < 0)
         TEST_ERROR;
 
     /* H5Fopen */
-    if ((fid = H5Fopen(NATIVE_VOL_TEST_FILENAME, H5F_ACC_RDWR, fapl_id)) < 0)
+    if ((fid = H5Fopen(filename, H5F_ACC_RDWR, fapl_id)) < 0)
         TEST_ERROR;
 
-    /* H5Fget_access_plist */
-    if ((fapl_id2 = H5Fget_access_plist(fid)) < 0)
-        TEST_ERROR;
-    if (H5Pequal(fapl_id, fapl_id2) != TRUE)
-        TEST_ERROR;
-    if (H5Pclose(fapl_id2) < 0)
-        TEST_ERROR;
+    /* Can't compare VFD properties for split / multi / family VFDs */
+    if((hbool_t)(HDstrcmp(env_h5_drvr, "split") && HDstrcmp(env_h5_drvr, "multi") && HDstrcmp(env_h5_drvr, "family"))) {
+        /* H5Fget_access_plist */
+        if((fapl_id2 = H5Fget_access_plist(fid)) < 0)
+            TEST_ERROR;
+        if(H5Pequal(fapl_id, fapl_id2) != TRUE)
+            TEST_ERROR;
+        if(H5Pclose(fapl_id2) < 0)
+            TEST_ERROR;
+    } /* end if */
 
     if ((fid_reopen = H5Freopen(fid)) < 0)
         TEST_ERROR;
 
-    /* H5Fget_access_plist */
-    if ((fapl_id2 = H5Fget_access_plist(fid_reopen)) < 0)
-        TEST_ERROR;
-    if (H5Pequal(fapl_id, fapl_id2) != TRUE)
-        TEST_ERROR;
-    if (H5Pclose(fapl_id2) < 0)
-        TEST_ERROR;
+    /* Can't compare VFD properties for split / multi / family VFDs */
+    if((hbool_t)(HDstrcmp(env_h5_drvr, "split") && HDstrcmp(env_h5_drvr, "multi") && HDstrcmp(env_h5_drvr, "family"))) {
+        /* H5Fget_access_plist */
+        if((fapl_id2 = H5Fget_access_plist(fid_reopen)) < 0)
+            TEST_ERROR;
+        if(H5Pequal(fapl_id, fapl_id2) != TRUE)
+            TEST_ERROR;
+        if(H5Pclose(fapl_id2) < 0)
+            TEST_ERROR;
+    } /* end if */
 
     if (H5Fclose(fid) < 0)
         TEST_ERROR;
     if (H5Fclose(fid_reopen) < 0)
         TEST_ERROR;
 
+    h5_delete_test_file(FILENAME[0], fapl_id);
+
     /* H5Pclose */
     if (H5Pclose(fapl_id) < 0)
         TEST_ERROR;
 
-    HDremove(NATIVE_VOL_TEST_FILENAME);
-
     PASSED();
     return SUCCEED;
 
@@ -404,14 +422,20 @@ static herr_t
 test_basic_group_operation(void)
 {
     hid_t fid = H5I_INVALID_HID;
+    hid_t fapl_id = H5I_INVALID_HID;
     hid_t gid = H5I_INVALID_HID;
     hid_t gid_a = H5I_INVALID_HID;
     hid_t gcpl_id = H5I_INVALID_HID;
+    char filename[1024];
     H5G_info_t info;
 
     TESTING("Basic VOL group operations");
 
-    if ((fid = H5Fcreate(NATIVE_VOL_TEST_FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT)) < 0)
+    /* Retrieve the file access property for testing */
+    fapl_id = h5_fileaccess();
+    h5_fixname(FILENAME[0], fapl_id, filename, sizeof filename);
+
+    if ((fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id)) < 0)
         TEST_ERROR;
 
     /* H5Gcreate */
@@ -465,7 +489,11 @@ test_basic_group_operation(void)
     if (H5Fclose(fid) < 0)
         TEST_ERROR;
 
-    HDremove(NATIVE_VOL_TEST_FILENAME);
+    h5_delete_test_file(FILENAME[0], fapl_id);
+
+    /* H5Pclose */
+    if (H5Pclose(fapl_id) < 0)
+        TEST_ERROR;
 
     PASSED();
     return SUCCEED;
@@ -474,6 +502,7 @@ error:
     H5E_BEGIN_TRY {
         H5Fclose(fid);
         H5Gclose(gid);
+        H5Pclose(fapl_id);
         H5Pclose(gcpl_id);
     } H5E_END_TRY;
 
@@ -495,6 +524,7 @@ static herr_t
 test_basic_dataset_operation(void)
 {
     hid_t fid       = H5I_INVALID_HID;
+    hid_t fapl_id   = H5I_INVALID_HID;
     hid_t dcpl_id   = H5I_INVALID_HID;
     hid_t dapl_id   = H5I_INVALID_HID;
     hid_t did       = H5I_INVALID_HID;
@@ -502,6 +532,8 @@ test_basic_dataset_operation(void)
     hid_t sid       = H5I_INVALID_HID;
     hid_t tid       = H5I_INVALID_HID;
 
+    char filename[1024];
+
     hsize_t curr_dims   = 0;
     hsize_t max_dims    = H5S_UNLIMITED;
 
@@ -516,7 +548,11 @@ test_basic_dataset_operation(void)
 
     TESTING("Basic VOL dataset operations");
 
-    if ((fid = H5Fcreate(NATIVE_VOL_TEST_FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT)) < 0)
+    /* Retrieve the file access property for testing */
+    fapl_id = h5_fileaccess();
+    h5_fixname(FILENAME[0], fapl_id, filename, sizeof filename);
+
+    if ((fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id)) < 0)
         TEST_ERROR;
     for (i = 0; i < N_ELEMENTS; i++) {
         in_buf[i] = i;
@@ -630,7 +666,11 @@ test_basic_dataset_operation(void)
     if (H5Fclose(fid) < 0)
         TEST_ERROR;
 
-    HDremove(NATIVE_VOL_TEST_FILENAME);
+    h5_delete_test_file(FILENAME[0], fapl_id);
+
+    /* H5Pclose */
+    if (H5Pclose(fapl_id) < 0)
+        TEST_ERROR;
 
     PASSED();
     return SUCCEED;
@@ -642,6 +682,7 @@ error:
         H5Dclose(did_a);
         H5Sclose(sid);
         H5Tclose(tid);
+        H5Pclose(fapl_id);
         H5Pclose(dapl_id);
         H5Pclose(dcpl_id);
     } H5E_END_TRY;
@@ -664,11 +705,14 @@ static herr_t
 test_basic_attribute_operation(void)
 {
     hid_t fid       = H5I_INVALID_HID;
+    hid_t fapl_id   = H5I_INVALID_HID;
     hid_t gid       = H5I_INVALID_HID;
     hid_t aid       = H5I_INVALID_HID;
     hid_t aid_name  = H5I_INVALID_HID;
     hid_t sid       = H5I_INVALID_HID;
 
+    char    filename[1024];
+
     hsize_t dims    = 1;
 
     int     data_in     = 42;
@@ -676,7 +720,11 @@ test_basic_attribute_operation(void)
 
     TESTING("Basic VOL attribute operations");
 
-    if ((fid = H5Fcreate(NATIVE_VOL_TEST_FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT)) < 0)
+    /* Retrieve the file access property for testing */
+    fapl_id = h5_fileaccess();
+    h5_fixname(FILENAME[0], fapl_id, filename, sizeof filename);
+
+    if ((fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id)) < 0)
         TEST_ERROR;
     if ((gid = H5Gcreate2(fid, NATIVE_VOL_TEST_GROUP_NAME, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
         TEST_ERROR;
@@ -730,7 +778,11 @@ test_basic_attribute_operation(void)
     if (H5Fclose(fid) < 0)
         TEST_ERROR;
 
-    HDremove(NATIVE_VOL_TEST_FILENAME);
+    h5_delete_test_file(FILENAME[0], fapl_id);
+
+    /* H5Pclose */
+    if (H5Pclose(fapl_id) < 0)
+        TEST_ERROR;
 
     PASSED();
     return SUCCEED;
@@ -738,6 +790,7 @@ test_basic_attribute_operation(void)
 error:
     H5E_BEGIN_TRY {
         H5Fclose(fid);
+        H5Pclose(fapl_id);
         H5Gclose(gid);
         H5Sclose(sid);
         H5Aclose(aid);
@@ -762,14 +815,20 @@ static herr_t
 test_basic_object_operation(void)
 {
     hid_t fid       = H5I_INVALID_HID;
+    hid_t fapl_id   = H5I_INVALID_HID;
     hid_t gid       = H5I_INVALID_HID;
     hid_t oid       = H5I_INVALID_HID;
 
+    char filename[1024];
     H5O_info_t object_info;
 
     TESTING("Basic VOL object operations");
 
-    if ((fid = H5Fcreate(NATIVE_VOL_TEST_FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT)) < 0)
+    /* Retrieve the file access property for testing */
+    fapl_id = h5_fileaccess();
+    h5_fixname(FILENAME[0], fapl_id, filename, sizeof filename);
+
+    if ((fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id)) < 0)
         TEST_ERROR;
     if ((gid = H5Gcreate2(fid, NATIVE_VOL_TEST_GROUP_NAME, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
         TEST_ERROR;
@@ -797,7 +856,12 @@ test_basic_object_operation(void)
     if (H5Gclose(gid) < 0)
         TEST_ERROR;
 
-    HDremove(NATIVE_VOL_TEST_FILENAME);
+    h5_delete_test_file(FILENAME[0], fapl_id);
+
+    /* H5Pclose */
+    if (H5Pclose(fapl_id) < 0)
+        TEST_ERROR;
+
 
     PASSED();
     return SUCCEED;
@@ -805,6 +869,7 @@ test_basic_object_operation(void)
 error:
     H5E_BEGIN_TRY {
         H5Fclose(fid);
+        H5Pclose(fapl_id);
         H5Gclose(gid);
     } H5E_END_TRY;
 
@@ -827,10 +892,16 @@ test_basic_link_operation(void)
 {
     hid_t fid       = H5I_INVALID_HID;
     hid_t gid       = H5I_INVALID_HID;
+    hid_t fapl_id   = H5I_INVALID_HID;
+    char filename[1024];
 
     TESTING("Basic VOL link operations");
 
-    if ((fid = H5Fcreate(NATIVE_VOL_TEST_FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT)) < 0)
+    /* Retrieve the file access property for testing */
+    fapl_id = h5_fileaccess();
+    h5_fixname(FILENAME[0], fapl_id, filename, sizeof filename);
+
+    if ((fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id)) < 0)
         TEST_ERROR;
     if ((gid = H5Gcreate2(fid, NATIVE_VOL_TEST_GROUP_NAME, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
         TEST_ERROR;
@@ -862,7 +933,12 @@ test_basic_link_operation(void)
     if (H5Gclose(gid) < 0)
         TEST_ERROR;
 
-    HDremove(NATIVE_VOL_TEST_FILENAME);
+    h5_delete_test_file(FILENAME[0], fapl_id);
+
+    /* H5Pclose */
+    if (H5Pclose(fapl_id) < 0)
+        TEST_ERROR;
+
 
     PASSED();
     return SUCCEED;
@@ -871,6 +947,7 @@ error:
     H5E_BEGIN_TRY {
         H5Fclose(fid);
         H5Fclose(gid);
+        H5Pclose(fapl_id);
     } H5E_END_TRY;
 
     return FAIL;
@@ -891,13 +968,19 @@ static herr_t
 test_basic_datatype_operation(void)
 {
     hid_t fid       = H5I_INVALID_HID;
+    hid_t fapl_id   = H5I_INVALID_HID;
     hid_t tid       = H5I_INVALID_HID;
     hid_t tid_anon  = H5I_INVALID_HID;
     hid_t tcpl_id   = H5I_INVALID_HID;
+    char filename[1024];
 
     TESTING("Basic VOL datatype operations");
 
-    if ((fid = H5Fcreate(NATIVE_VOL_TEST_FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT)) < 0)
+    /* Retrieve the file access property for testing */
+    fapl_id = h5_fileaccess();
+    h5_fixname(FILENAME[0], fapl_id, filename, sizeof filename);
+
+    if ((fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id)) < 0)
         TEST_ERROR;
     if ((tid = H5Tcopy(H5T_NATIVE_INT)) < 0)
         TEST_ERROR;
@@ -941,7 +1024,11 @@ test_basic_datatype_operation(void)
     if (H5Fclose(fid) < 0)
         TEST_ERROR;
 
-    HDremove(NATIVE_VOL_TEST_FILENAME);
+    h5_delete_test_file(FILENAME[0], fapl_id);
+
+    /* H5Pclose */
+    if (H5Pclose(fapl_id) < 0)
+        TEST_ERROR;
 
     PASSED();
     return SUCCEED;
@@ -950,6 +1037,7 @@ error:
     H5E_BEGIN_TRY {
         H5Pclose(tcpl_id);
         H5Fclose(fid);
+        H5Pclose(fapl_id);
         H5Tclose(tid);
         H5Tclose(tid_anon);
     } H5E_END_TRY;
@@ -958,34 +1046,6 @@ error:
 
 } /* end test_basic_datatype_operation() */
 
-#if 0
-
-/*-------------------------------------------------------------------------
- * Function:    test_echo_vol_operation()
- *
- * Purpose:     Uses the echo VOL connector to test basic VOL operations
- *              via the H5VL public API.
- *
- * Return:      SUCCEED/FAIL
- *
- *-------------------------------------------------------------------------
- */
-static herr_t
-test_echo_vol_operation(void)
-{
-    char name[25];
-
-    TESTING("Echo VOL operations");
-
-    PASSED();
-    return SUCCEED;
-
-error:
-    return FAIL;
-
-} /* end test_basic_vol_operation() */
-#endif
-
 
 /*-------------------------------------------------------------------------
  * Function:    main
@@ -999,15 +1059,21 @@ error:
 int
 main(void)
 {
+    const char  *env_h5_drvr;   /* File driver value from environment */
     int nerrors = 0;
 
+    /* Get the VFD to use */
+    env_h5_drvr = HDgetenv("HDF5_DRIVER");
+    if(env_h5_drvr == NULL)
+        env_h5_drvr = "nomatch";
+
     h5_reset();
 
     HDputs("Testing basic Virtual Object Layer (VOL) functionality.");
 
     nerrors += test_vol_registration() < 0          ? 1 : 0;
     nerrors += test_native_vol_init() < 0           ? 1 : 0;
-    nerrors += test_basic_file_operation() < 0      ? 1 : 0;
+    nerrors += test_basic_file_operation(env_h5_drvr) < 0 ? 1 : 0;
     nerrors += test_basic_group_operation() < 0     ? 1 : 0;
     nerrors += test_basic_dataset_operation() < 0   ? 1 : 0;
     nerrors += test_basic_attribute_operation() < 0 ? 1 : 0;
diff --git a/test/vol_plugin.c b/test/vol_plugin.c
new file mode 100644
index 0000000..236a67e
--- /dev/null
+++ b/test/vol_plugin.c
@@ -0,0 +1,291 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Purpose:     Tests basic VOL plugin operations (registration, etc.).
+ *              Uses the null VOL connector (built with the testing code)
+ *              which is loaded as a dynamic plugin.
+ *
+ * TO DO:       Adapt the null VOL connector to do something interesting with
+ *              the property list.
+ */
+
+#include "h5test.h"
+
+#include "null_vol_connector.h"
+
+
+/*-------------------------------------------------------------------------
+ * Function:    test_registration_by_value()
+ *
+ * Purpose:     Tests if we can load, register, and close a VOL
+ *              connector by value.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+test_registration_by_value(void)
+{
+    htri_t  is_registered   = FAIL;
+    hid_t   vol_id          = H5I_INVALID_HID;
+
+    TESTING("VOL registration by value");
+
+    /* The null VOL connector should not be registered at the start of the test */
+    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+        TEST_ERROR;
+    if(TRUE == is_registered)
+        FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
+
+    /* Register the connector by value */
+    if((vol_id = H5VLregister_connector_by_value(NULL_VOL_CONNECTOR_VALUE, H5P_DEFAULT)) < 0)
+        TEST_ERROR;
+
+    /* The connector should be registered now */
+    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+        TEST_ERROR;
+    if(FALSE == is_registered)
+        FAIL_PUTS_ERROR("NULL VOL connector was not registered");
+
+    /* Unregister the connector */
+    if(H5VLunregister_connector(vol_id) < 0)
+        TEST_ERROR;
+
+    /* The connector should not be registered now */
+    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+        TEST_ERROR;
+    if(TRUE == is_registered)
+        FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
+
+    PASSED();
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY {
+        H5VLunregister_connector(vol_id);
+    } H5E_END_TRY;
+    return FAIL;
+
+} /* end test_registration_by_value() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    test_registration_by_name()
+ *
+ * Purpose:     Tests if we can load, register, and close a VOL
+ *              connector by name.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+test_registration_by_name(void)
+{
+    htri_t  is_registered   = FAIL;
+    hid_t   vol_id          = H5I_INVALID_HID;
+
+    TESTING("VOL registration by name");
+
+    /* The null VOL connector should not be registered at the start of the test */
+    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+        TEST_ERROR;
+    if(TRUE == is_registered)
+        FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
+
+    /* Register the connector by name */
+    if((vol_id = H5VLregister_connector_by_name(NULL_VOL_CONNECTOR_NAME, H5P_DEFAULT)) < 0)
+        TEST_ERROR;
+
+    /* The connector should be registered now */
+    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+        TEST_ERROR;
+    if(FALSE == is_registered)
+        FAIL_PUTS_ERROR("NULL VOL connector was not registered");
+
+    /* Unregister the connector */
+    if(H5VLunregister_connector(vol_id) < 0)
+        TEST_ERROR;
+
+    /* The connector should not be registered now */
+    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+        TEST_ERROR;
+    if(TRUE == is_registered)
+        FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
+
+    PASSED();
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY {
+        H5VLunregister_connector(vol_id);
+    } H5E_END_TRY;
+    return FAIL;
+
+} /* end test_registration_by_name() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    test_multiple_registration()
+ *
+ * Purpose:     Tests if we can register a VOL connector multiple times.
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+#define N_REGISTRATIONS 10
+static herr_t
+test_multiple_registration(void)
+{
+    htri_t  is_registered   = FAIL;
+    hid_t   vol_ids[N_REGISTRATIONS];
+    int     i;
+
+    TESTING("registering a VOL connector multiple times");
+
+    /* The null VOL connector should not be registered at the start of the test */
+    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+        TEST_ERROR;
+    if(TRUE == is_registered)
+        FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
+
+    /* Register the connector multiple times */
+    for(i = 0; i < N_REGISTRATIONS; i++) {
+        if((vol_ids[i] = H5VLregister_connector_by_name(NULL_VOL_CONNECTOR_NAME, H5P_DEFAULT)) < 0)
+            TEST_ERROR;
+    }
+
+    /* The connector should be registered now */
+    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+        TEST_ERROR;
+    if(FALSE == is_registered)
+        FAIL_PUTS_ERROR("NULL VOL connector was not registered");
+
+    /* Unregister the connector */
+    for(i = 0; i < N_REGISTRATIONS; i++) {
+        if(H5VLunregister_connector(vol_ids[i]) < 0)
+            TEST_ERROR;
+        /* Also test close on some of the IDs. This call currently works
+         * identically to unregister.
+         */
+        i++;
+        if(H5VLclose(vol_ids[i]) < 0)
+            TEST_ERROR;
+    }
+
+    /* The connector should not be registered now */
+    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+        TEST_ERROR;
+    if(TRUE == is_registered)
+        FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
+
+    PASSED();
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY {
+        for(i = 0; i < N_REGISTRATIONS; i++)
+            H5VLunregister_connector(vol_ids[i]);
+    } H5E_END_TRY;
+    return FAIL;
+
+} /* end test_multiple_registration() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    test_getters()
+ *
+ * Purpose:     Tests H5VL getters
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+test_getters(void)
+{
+    htri_t  is_registered   = FAIL;
+    hid_t   vol_id          = H5I_INVALID_HID;
+    hid_t   vol_id_out      = H5I_INVALID_HID;
+
+    TESTING("VOL getters");
+
+    /* The null VOL connector should not be registered at the start of the test */
+    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+        TEST_ERROR;
+    if(TRUE == is_registered)
+        FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
+
+    /* Register the connector by name */
+    if((vol_id = H5VLregister_connector_by_name(NULL_VOL_CONNECTOR_NAME, H5P_DEFAULT)) < 0)
+        TEST_ERROR;
+
+    /* Get the connector's ID */
+    if((vol_id_out = H5VLget_connector_id(NULL_VOL_CONNECTOR_NAME)) < 0)
+        TEST_ERROR;
+    if(vol_id != vol_id_out)
+        FAIL_PUTS_ERROR("VOL connector IDs don't match");
+
+    /* Unregister the connector */
+    if(H5VLunregister_connector(vol_id) < 0)
+        TEST_ERROR;
+
+    PASSED();
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY {
+        H5VLunregister_connector(vol_id);
+    } H5E_END_TRY;
+    return FAIL;
+
+} /* end test_getters() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    main
+ *
+ * Purpose:     Tests VOL connector plugin operations
+ *
+ * Return:      EXIT_SUCCESS/EXIT_FAILURE
+ *
+ *-------------------------------------------------------------------------
+ */
+int
+main(void)
+{
+    int nerrors = 0;
+
+    h5_reset();
+
+    HDputs("Testing VOL connector plugin functionality.");
+
+    nerrors += test_registration_by_name() < 0          ? 1 : 0;
+    nerrors += test_registration_by_value() < 0         ? 1 : 0;
+    nerrors += test_multiple_registration() < 0         ? 1 : 0;
+    nerrors += test_getters() < 0                       ? 1 : 0;
+
+    if(nerrors) {
+        HDprintf("***** %d VOL connector plugin TEST%s FAILED! *****\n",
+            nerrors, nerrors > 1 ? "S" : "");
+        HDexit(EXIT_FAILURE);
+    }
+
+    HDputs("All VOL connector plugin tests passed.");
+
+    HDexit(EXIT_SUCCESS);
+
+} /* end main() */
+
diff --git a/testpar/CMakeTests.cmake b/testpar/CMakeTests.cmake
index 87470f3..a0d7f59 100644
--- a/testpar/CMakeTests.cmake
+++ b/testpar/CMakeTests.cmake
@@ -22,52 +22,17 @@ foreach (testp ${H5P_TESTS})
   add_test (NAME TEST_PAR_${testp} COMMAND ${MPIEXEC_EXECUTABLE} ${MPIEXEC_NUMPROC_FLAG} ${MPIEXEC_MAX_NUMPROCS} ${MPIEXEC_PREFLAGS} $<TARGET_FILE:${testp}> ${MPIEXEC_POSTFLAGS})
 endforeach ()
 
-# The following will only be correct on windows shared
-#set_tests_properties (TEST_PAR_t_pflush1 PROPERTIES WILL_FAIL "true")
-set_property (TEST TEST_PAR_t_pflush1 PROPERTY PASS_REGULAR_EXPRESSION "PASSED")
+# The t_pflush1 test is hard-coded to fail.
+set_tests_properties (TEST_PAR_t_pflush1 PROPERTIES WILL_FAIL "true")
+#set_property (TEST TEST_PAR_t_pflush1 PROPERTY PASS_REGULAR_EXPRESSION "PASSED")
 set_tests_properties (TEST_PAR_t_pflush2 PROPERTIES DEPENDS TEST_PAR_t_pflush1)
 
-if (HDF5_TEST_VFD)
-
-  set (VFD_LIST
-      sec2
-      stdio
-      core
-      split
-      multi
-      family
-  )
-
-  set (H5P_VFD_TESTS
-      t_pflush1
-      t_pflush2
-  )
-
-  if (DIRECT_VFD)
-    set (VFD_LIST ${VFD_LIST} direct)
-  endif ()
-
-  macro (ADD_VFD_TEST vfdname resultcode)
-    if (NOT HDF5_ENABLE_USING_MEMCHECKER)
-      foreach (test ${H5P_VFD_TESTS})
-        add_test (
-          NAME TEST_PAR_VFD-${vfdname}-${test}
-          COMMAND "${CMAKE_COMMAND}"
-              -D "TEST_PROGRAM=$<TARGET_FILE:${test}>"
-              -D "TEST_ARGS:STRING="
-              -D "TEST_VFD:STRING=${vfdname}"
-              -D "TEST_EXPECT=${resultcode}"
-              -D "TEST_OUTPUT=${test}"
-              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}"
-              -P "${HDF_RESOURCES_DIR}/vfdTest.cmake"
-        )
-      endforeach ()
-    endif ()
-  endmacro ()
-
-  # Run test with different Virtual File Driver
-  foreach (vfd ${VFD_LIST})
-    ADD_VFD_TEST (${vfd} 0)
-  endforeach ()
+##############################################################################
+##############################################################################
+###                         V F D   T E S T S                              ###
+##############################################################################
+##############################################################################
 
+if (HDF5_TEST_VFD)
+  include (CMakeVFDTests.cmake)
 endif ()
diff --git a/testpar/CMakeVFDTests.cmake b/testpar/CMakeVFDTests.cmake
new file mode 100644
index 0000000..b6b065f
--- /dev/null
+++ b/testpar/CMakeVFDTests.cmake
@@ -0,0 +1,57 @@
+#
+# Copyright by The HDF Group.
+# All rights reserved.
+#
+# This file is part of HDF5.  The full HDF5 copyright notice, including
+# terms governing use, modification, and redistribution, is contained in
+# the COPYING file, which can be found at the root of the source code
+# distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.
+# If you do not have access to either file, you may request a copy from
+# help@hdfgroup.org.
+#
+
+##############################################################################
+##############################################################################
+###           T E S T I N G                                                ###
+##############################################################################
+##############################################################################
+  set (VFD_LIST
+      sec2
+      stdio
+      core
+      split
+      multi
+      family
+  )
+
+  set (H5P_VFD_TESTS
+      t_pflush1
+      t_pflush2
+  )
+
+  if (DIRECT_VFD)
+    set (VFD_LIST ${VFD_LIST} direct)
+  endif ()
+
+  macro (ADD_VFD_TEST vfdname resultcode)
+    if (NOT HDF5_ENABLE_USING_MEMCHECKER)
+      foreach (test ${H5P_VFD_TESTS})
+        add_test (
+          NAME TEST_PAR_VFD-${vfdname}-${test}
+          COMMAND "${CMAKE_COMMAND}"
+              -D "TEST_PROGRAM=$<TARGET_FILE:${test}>"
+              -D "TEST_ARGS:STRING="
+              -D "TEST_VFD:STRING=${vfdname}"
+              -D "TEST_EXPECT=${resultcode}"
+              -D "TEST_OUTPUT=${test}"
+              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}"
+              -P "${HDF_RESOURCES_DIR}/vfdTest.cmake"
+        )
+      endforeach ()
+    endif ()
+  endmacro ()
+
+  # Run test with different Virtual File Driver
+  foreach (vfd ${VFD_LIST})
+    ADD_VFD_TEST (${vfd} 0)
+  endforeach ()
diff --git a/testpar/Makefile.am b/testpar/Makefile.am
index 7262ca6..a11099d 100644
--- a/testpar/Makefile.am
+++ b/testpar/Makefile.am
@@ -21,11 +21,19 @@ include $(top_srcdir)/config/commence.am
 
 AM_CPPFLAGS+=-I$(top_srcdir)/src -I$(top_srcdir)/test
 
+# Test scripts--
+#       testpflush.sh:
+TEST_SCRIPT_PARA = testpflush.sh
+SCRIPT_DEPEND = t_pflush1$(EXEEXT) t_pflush2$(EXEEXT) 
+
+check_SCRIPTS = $(TEST_SCRIPT_PARA)
+
 # Test programs.  These are our main targets.
 #
-TEST_PROG_PARA=t_mpi t_bigio testphdf5 t_cache t_cache_image t_pflush1 t_pflush2 t_pread t_pshutdown t_prestart t_init_term t_shapesame t_filters_parallel
+TEST_PROG_PARA=t_mpi t_bigio testphdf5 t_cache t_cache_image t_pread t_pshutdown t_prestart t_init_term t_shapesame t_filters_parallel
 
-check_PROGRAMS = $(TEST_PROG_PARA)
+# t_pflush1 and t_pflush2 are used by testpflush.sh
+check_PROGRAMS = $(TEST_PROG_PARA) t_pflush1 t_pflush2
 
 testphdf5_SOURCES=testphdf5.c t_dset.c t_file.c t_file_image.c t_mdset.c \
 	t_ph5basic.c t_coll_chunk.c t_span_tree.c t_chunk_alloc.c t_filter_read.c \
diff --git a/testpar/t_bigio.c b/testpar/t_bigio.c
index fdd3488..1d882b8 100644
--- a/testpar/t_bigio.c
+++ b/testpar/t_bigio.c
@@ -671,7 +671,7 @@ dataset_big_write(void)
     /* create a memory dataspace independently */
     mem_dataspace = H5Screate_simple (RANK, dims, NULL);
     VRFY((mem_dataspace >= 0), "");
-    if(!mpi_rank == 0) {
+    if(mpi_rank != 0) {
         ret = H5Sselect_none(mem_dataspace);
         VRFY((ret >= 0), "H5Sset_none succeeded");
     }
@@ -980,7 +980,7 @@ dataset_big_read(void)
     /* create a memory dataspace independently */
     mem_dataspace = H5Screate_simple (RANK, dims, NULL);
     VRFY((mem_dataspace >= 0), "");
-    if(!mpi_rank == 0) {
+    if(mpi_rank != 0) {
         ret = H5Sselect_none(mem_dataspace);
         VRFY((ret >= 0), "H5Sset_none succeeded");
     }
diff --git a/testpar/t_cache.c b/testpar/t_cache.c
index da83884..7488728 100644
--- a/testpar/t_cache.c
+++ b/testpar/t_cache.c
@@ -467,9 +467,7 @@ static void lock_and_unlock_random_entry(H5F_t * file_ptr,
 static void lock_entry(H5F_t * file_ptr, int32_t idx);
 static void mark_entry_dirty(int32_t idx);
 static void pin_entry(H5F_t * file_ptr, int32_t idx, hbool_t global, hbool_t dirty);
-#ifdef H5_METADATA_TRACE_FILE
 static void pin_protected_entry(int32_t idx, hbool_t global);
-#endif /* H5_METADATA_TRACE_FILE */
 static void move_entry(H5F_t * file_ptr, int32_t old_idx, int32_t new_idx);
 static hbool_t reset_server_counts(void);
 static void resize_entry(int32_t idx, size_t  new_size);
@@ -3693,7 +3691,6 @@ pin_entry(H5F_t * file_ptr,
 
 } /* pin_entry() */
 
-#ifdef H5_METADATA_TRACE_FILE
 
 /*****************************************************************************
  * Function:    pin_protected_entry()
@@ -3762,7 +3759,6 @@ pin_protected_entry(int32_t idx,
     return;
 
 } /* pin_protected_entry() */
-#endif /* H5_METADATA_TRACE_FILE */
 
 
 /*****************************************************************************
@@ -6809,8 +6805,6 @@ smoke_check_5(int metadata_write_strategy)
  *                    - H5AC_expunge_entry()
  *                    - H5AC_resize_entry()
  *
- *              This test is skipped if H5_METADATA_TRACE_FILE is undefined.
- *
  * Return:    Success:    TRUE
  *
  *        Failure:    FALSE
@@ -6823,63 +6817,63 @@ trace_file_check(int metadata_write_strategy)
 {
     hbool_t success = TRUE;
 
-#ifdef H5_METADATA_TRACE_FILE
-
     const char *((* expected_output)[]) = NULL;
     const char * expected_output_0[] =
     {
       "### HDF5 metadata cache trace file version 1 ###\n",
-      "H5AC_set_cache_auto_resize_config 1 0 1 0 \"t_cache_trace.txt\" 1 0 2097152 0.300000 33554432 1048576 50000 1 0.900000 2.000000 1 1.000000 0.250000 1 4194304 3 0.999000 0.900000 1 1048576 3 1 0.100000 262144 0 0\n",
-      "H5AC_insert_entry 0x400 27 0x0 2 0\n",
-      "H5AC_insert_entry 0x402 27 0x0 2 0\n",
-      "H5AC_insert_entry 0x404 27 0x0 4 0\n",
-      "H5AC_insert_entry 0x408 27 0x0 6 0\n",
-      "H5AC_protect 0x400 27 0x0 2 1\n",
-      "H5AC_mark_entry_dirty 0x400 0\n",
-      "H5AC_unprotect 0x400 27 0x0 0\n",
-      "H5AC_protect 0x402 27 0x0 2 1\n",
-      "H5AC_pin_protected_entry 0x402 0\n",
-      "H5AC_unprotect 0x402 27 0x0 0\n",
-      "H5AC_unpin_entry 0x402 0\n",
-      "H5AC_expunge_entry 0x402 27 0\n",
-      "H5AC_protect 0x404 27 0x0 4 1\n",
-      "H5AC_pin_protected_entry 0x404 0\n",
-      "H5AC_unprotect 0x404 27 0x0 0\n",
-      "H5AC_mark_entry_dirty 0x404 0\n",
-      "H5AC_resize_entry 0x404 2 0\n",
-      "H5AC_resize_entry 0x404 4 0\n",
-      "H5AC_unpin_entry 0x404 0\n",
-      "H5AC_move_entry 0x400 0x8e65 27 0\n",
-      "H5AC_move_entry 0x8e65 0x400 27 0\n",
-      "H5AC_flush 0\n",
+      "H5AC_set_cache_auto_resize_config",
+      "H5AC_insert_entry",
+      "H5AC_insert_entry",
+      "H5AC_insert_entry",
+      "H5AC_insert_entry",
+      "H5AC_protect",
+      "H5AC_mark_entry_dirty",
+      "H5AC_unprotect",
+      "H5AC_protect",
+      "H5AC_pin_protected_entry",
+      "H5AC_unprotect",
+      "H5AC_unpin_entry",
+      "H5AC_expunge_entry",
+      "H5AC_protect",
+      "H5AC_pin_protected_entry",
+      "H5AC_unprotect",
+      "H5AC_mark_entry_dirty",
+      "H5AC_resize_entry",
+      "H5AC_resize_entry",
+      "H5AC_unpin_entry",
+      "H5AC_move_entry",
+      "H5AC_move_entry",
+      "H5AC_flush",
+      "H5AC_flush",
       NULL
     };
     const char * expected_output_1[] =
     {
       "### HDF5 metadata cache trace file version 1 ###\n",
-      "H5AC_set_cache_auto_resize_config 1 0 1 0 \"t_cache_trace.txt\" 1 0 2097152 0.300000 33554432 1048576 50000 1 0.900000 2.000000 1 1.000000 0.250000 1 4194304 3 0.999000 0.900000 1 1048576 3 1 0.100000 262144 1 0\n",
-      "H5AC_insert_entry 0x400 27 0x0 2 0\n",
-      "H5AC_insert_entry 0x402 27 0x0 2 0\n",
-      "H5AC_insert_entry 0x404 27 0x0 4 0\n",
-      "H5AC_insert_entry 0x408 27 0x0 6 0\n",
-      "H5AC_protect 0x400 27 0x0 2 1\n",
-      "H5AC_mark_entry_dirty 0x400 0\n",
-      "H5AC_unprotect 0x400 27 0x0 0\n",
-      "H5AC_protect 0x402 27 0x0 2 1\n",
-      "H5AC_pin_protected_entry 0x402 0\n",
-      "H5AC_unprotect 0x402 27 0x0 0\n",
-      "H5AC_unpin_entry 0x402 0\n",
-      "H5AC_expunge_entry 0x402 27 0\n",
-      "H5AC_protect 0x404 27 0x0 4 1\n",
-      "H5AC_pin_protected_entry 0x404 0\n",
-      "H5AC_unprotect 0x404 27 0x0 0\n",
-      "H5AC_mark_entry_dirty 0x404 0\n",
-      "H5AC_resize_entry 0x404 2 0\n",
-      "H5AC_resize_entry 0x404 4 0\n",
-      "H5AC_unpin_entry 0x404 0\n",
-      "H5AC_move_entry 0x400 0x8e65 27 0\n",
-      "H5AC_move_entry 0x8e65 0x400 27 0\n",
-      "H5AC_flush 0\n",
+      "H5AC_set_cache_auto_resize_config",
+      "H5AC_insert_entry",
+      "H5AC_insert_entry",
+      "H5AC_insert_entry",
+      "H5AC_insert_entry",
+      "H5AC_protect",
+      "H5AC_mark_entry_dirty",
+      "H5AC_unprotect",
+      "H5AC_protect",
+      "H5AC_pin_protected_entry",
+      "H5AC_unprotect",
+      "H5AC_unpin_entry",
+      "H5AC_expunge_entry",
+      "H5AC_protect",
+      "H5AC_pin_protected_entry",
+      "H5AC_unprotect",
+      "H5AC_mark_entry_dirty",
+      "H5AC_resize_entry",
+      "H5AC_resize_entry",
+      "H5AC_unpin_entry",
+      "H5AC_move_entry",
+      "H5AC_move_entry",
+      "H5AC_flush",
+      "H5AC_flush",
       NULL
     };
     char buffer[256];
@@ -6887,8 +6881,8 @@ trace_file_check(int metadata_write_strategy)
     hbool_t done = FALSE;
     int i;
     int max_nerrors;
-    int expected_line_len;
-    int actual_line_len;
+    size_t expected_line_len;
+    size_t actual_line_len;
     hid_t fid = -1;
     H5F_t * file_ptr = NULL;
     H5C_t * cache_ptr = NULL;
@@ -6896,188 +6890,151 @@ trace_file_check(int metadata_write_strategy)
     H5AC_cache_config_t config;
     struct mssg_t mssg;
 
-#endif /* H5_METADATA_TRACE_FILE */
 
-    switch ( metadata_write_strategy ) {
+    switch(metadata_write_strategy) {
+
+        case H5AC_METADATA_WRITE_STRATEGY__PROCESS_0_ONLY:
 
-    case H5AC_METADATA_WRITE_STRATEGY__PROCESS_0_ONLY:
-#ifdef H5_METADATA_TRACE_FILE
             expected_output = &expected_output_0;
-#endif /* H5_METADATA_TRACE_FILE */
-            if ( world_mpi_rank == 0 ) {
-            TESTING(
-            "trace file collection -- process 0 only md write strategy");
-            }
-        break;
 
-    case H5AC_METADATA_WRITE_STRATEGY__DISTRIBUTED:
-#ifdef H5_METADATA_TRACE_FILE
+            if(world_mpi_rank == 0)
+                TESTING("trace file collection -- process 0 only md write strategy");
+            break;
+
+        case H5AC_METADATA_WRITE_STRATEGY__DISTRIBUTED:
+
             expected_output = &expected_output_1;
-#endif /* H5_METADATA_TRACE_FILE */
-            if ( world_mpi_rank == 0 ) {
-            TESTING(
-            "trace file collection -- distributed md write strategy");
-            }
-        break;
+
+            if(world_mpi_rank == 0)
+                TESTING("trace file collection -- distributed md write strategy");
+            break;
 
         default:
-#ifdef H5_METADATA_TRACE_FILE
+
             /* this will almost certainly cause a failure, but it keeps us
              * from de-referenceing a NULL pointer.
              */
             expected_output = &expected_output_0;
-#endif /* H5_METADATA_TRACE_FILE */
-            if ( world_mpi_rank == 0 ) {
-            TESTING("trace file collection -- unknown md write strategy");
-            }
-        break;
-    }
 
-#ifdef H5_METADATA_TRACE_FILE
+            if(world_mpi_rank == 0)
+                TESTING("trace file collection -- unknown md write strategy");
+            break;
+    } /* end switch */
+
 
     nerrors = 0;
     init_data();
     reset_stats();
 
-    if ( world_mpi_rank == world_server_mpi_rank ) {
+    if(world_mpi_rank == world_server_mpi_rank) {
 
-    if ( ! server_main() ) {
+        if(!server_main()) {
 
             /* some error occured in the server -- report failure */
             nerrors++;
-            if ( verbose ) {
-        HDfprintf(stdout, "%d:%s: server_main() failed.\n",
-                          world_mpi_rank, FUNC);
-            }
+            if ( verbose )
+                HDfprintf(stdout, "%d:%s: server_main() failed.\n", world_mpi_rank, FUNC);
         }
     }
-    else /* run the clients */
-    {
+    else {
+        /* run the clients */
 
-        if ( ! setup_cache_for_test(&fid, &file_ptr, &cache_ptr,
-                                    metadata_write_strategy) ) {
+        if(!setup_cache_for_test(&fid, &file_ptr, &cache_ptr, metadata_write_strategy) ) {
 
             nerrors++;
             fid = -1;
             cache_ptr = NULL;
-            if ( verbose ) {
-        HDfprintf(stdout, "%d:%s: setup_cache_for_test() failed.\n",
-                          world_mpi_rank, FUNC);
-            }
+            if(verbose)
+                HDfprintf(stdout, "%d:%s: setup_cache_for_test() failed.\n", world_mpi_rank, FUNC);
         }
 
-        if ( nerrors == 0 ) {
+        if(nerrors == 0) {
 
             config.version = H5AC__CURR_CACHE_CONFIG_VERSION;
 
-            if ( H5AC_get_cache_auto_resize_config(cache_ptr, &config)
-                 != SUCCEED ) {
-
-        nerrors++;
-            HDfprintf(stdout,
-                        "%d:%s: H5AC_get_cache_auto_resize_config() failed.\n",
-                        world_mpi_rank, FUNC);
-
-            } else {
-
+            if(H5AC_get_cache_auto_resize_config(cache_ptr, &config) != SUCCEED) {
+                nerrors++;
+                HDfprintf(stdout, "%d:%s: H5AC_get_cache_auto_resize_config() failed.\n", world_mpi_rank, FUNC);
+            }
+            else {
                 config.open_trace_file = TRUE;
-        strcpy(config.trace_file_name, "t_cache_trace.txt");
+                strcpy(config.trace_file_name, "t_cache_trace.txt");
 
-                if ( H5AC_set_cache_auto_resize_config(cache_ptr, &config)
-            != SUCCEED ) {
-
-            nerrors++;
-                HDfprintf(stdout,
-                         "%d:%s: H5AC_set_cache_auto_resize_config() failed.\n",
-                          world_mpi_rank, FUNC);
+                if(H5AC_set_cache_auto_resize_config(cache_ptr, &config) != SUCCEED) {
+                    nerrors++;
+                    HDfprintf(stdout, "%d:%s: H5AC_set_cache_auto_resize_config() failed.\n", world_mpi_rank, FUNC);
                 }
             }
-        }
+        } /* end if */
 
-    insert_entry(cache_ptr, file_ptr, 0, H5AC__NO_FLAGS_SET);
-    insert_entry(cache_ptr, file_ptr, 1, H5AC__NO_FLAGS_SET);
-    insert_entry(cache_ptr, file_ptr, 2, H5AC__NO_FLAGS_SET);
-    insert_entry(cache_ptr, file_ptr, 3, H5AC__NO_FLAGS_SET);
+        insert_entry(cache_ptr, file_ptr, 0, H5AC__NO_FLAGS_SET);
+        insert_entry(cache_ptr, file_ptr, 1, H5AC__NO_FLAGS_SET);
+        insert_entry(cache_ptr, file_ptr, 2, H5AC__NO_FLAGS_SET);
+        insert_entry(cache_ptr, file_ptr, 3, H5AC__NO_FLAGS_SET);
 
-    lock_entry(file_ptr, 0);
-    mark_entry_dirty(0);
-    unlock_entry(file_ptr, 0, H5AC__NO_FLAGS_SET);
+        lock_entry(file_ptr, 0);
+        mark_entry_dirty(0);
+        unlock_entry(file_ptr, 0, H5AC__NO_FLAGS_SET);
 
-    lock_entry(file_ptr, 1);
+        lock_entry(file_ptr, 1);
         pin_protected_entry(1, TRUE);
-    unlock_entry(file_ptr, 1, H5AC__NO_FLAGS_SET);
+        unlock_entry(file_ptr, 1, H5AC__NO_FLAGS_SET);
         unpin_entry(file_ptr, 1, TRUE, FALSE, FALSE);
 
         expunge_entry(file_ptr, 1);
 
-    lock_entry(file_ptr, 2);
+        lock_entry(file_ptr, 2);
         pin_protected_entry(2, TRUE);
-    unlock_entry(file_ptr, 2, H5AC__NO_FLAGS_SET);
-    mark_entry_dirty(2);
+        unlock_entry(file_ptr, 2, H5AC__NO_FLAGS_SET);
+        mark_entry_dirty(2);
         resize_entry(2, data[2].len / 2);
         resize_entry(2, data[2].len);
         unpin_entry(file_ptr, 2, TRUE, FALSE, FALSE);
 
-    move_entry(file_ptr, 0, 20);
-    move_entry(file_ptr, 0, 20);
+        move_entry(file_ptr, 0, 20);
+        move_entry(file_ptr, 0, 20);
 
-        if ( H5Fflush(fid, H5F_SCOPE_GLOBAL) < 0 ) {
+        if(H5Fflush(fid, H5F_SCOPE_GLOBAL) < 0) {
             nerrors++;
-            if ( verbose ) {
-            HDfprintf(stdout, "%d:%s: H5Fflush() failed.\n",
-                          world_mpi_rank, FUNC);
-            }
+            if(verbose)
+                HDfprintf(stdout, "%d:%s: H5Fflush() failed.\n", world_mpi_rank, FUNC);
         }
 
-        if ( nerrors == 0 ) {
-
+        if(nerrors == 0) {
             config.version = H5AC__CURR_CACHE_CONFIG_VERSION;
 
-            if ( H5AC_get_cache_auto_resize_config(cache_ptr, &config)
-                 != SUCCEED ) {
-
-        nerrors++;
-            HDfprintf(stdout,
-                        "%d:%s: H5AC_get_cache_auto_resize_config() failed.\n",
-                        world_mpi_rank, FUNC);
-
-            } else {
-
+            if(H5AC_get_cache_auto_resize_config(cache_ptr, &config) != SUCCEED) {
+                nerrors++;
+                HDfprintf(stdout, "%d:%s: H5AC_get_cache_auto_resize_config() failed.\n", world_mpi_rank, FUNC);
+            }
+            else {
                 config.open_trace_file = FALSE;
                 config.close_trace_file = TRUE;
-        config.trace_file_name[0] = '\0';
+                config.trace_file_name[0] = '\0';
 
-                if ( H5AC_set_cache_auto_resize_config(cache_ptr, &config)
-            != SUCCEED ) {
-
-            nerrors++;
-                HDfprintf(stdout,
-                        "%d:%s: H5AC_set_cache_auto_resize_config() failed.\n",
-                        world_mpi_rank, FUNC);
+                if(H5AC_set_cache_auto_resize_config(cache_ptr, &config) != SUCCEED) {
+                    nerrors++;
+                    HDfprintf(stdout, "%d:%s: H5AC_set_cache_auto_resize_config() failed.\n", world_mpi_rank, FUNC);
                 }
             }
-        }
-
-        if ( fid >= 0 ) {
+        } /* end if */
 
-            if ( ! take_down_cache(fid, cache_ptr) ) {
+        if(fid >= 0) {
+            if(!take_down_cache(fid, cache_ptr)) {
 
                 nerrors++;
-                if ( verbose ) {
-            HDfprintf(stdout, "%d:%s: take_down_cache() failed.\n",
-                              world_mpi_rank, FUNC);
-                }
+                if(verbose)
+                    HDfprintf(stdout, "%d:%s: take_down_cache() failed.\n", world_mpi_rank, FUNC);
             }
-        }
+        } /* end if */
 
         /* verify that all instance of datum are back where the started
          * and are clean.
          */
 
-        for ( i = 0; i < NUM_DATA_ENTRIES; i++ )
-        {
-            HDassert( data_index[i] == i );
-            HDassert( ! (data[i].dirty) );
+        for(i = 0; i < NUM_DATA_ENTRIES; i++) {
+            HDassert(data_index[i] == i);
+            HDassert(!(data[i].dirty));
         }
 
         /* compose the done message */
@@ -7091,117 +7048,121 @@ trace_file_check(int metadata_write_strategy)
         mssg.count     = 0; /* not used */
         mssg.magic     = MSSG_MAGIC;
 
-        if ( success ) {
-
+        if(success) {
             success = send_mssg(&mssg, FALSE);
 
-            if ( ! success ) {
-
+            if(!success) {
                 nerrors++;
-                if ( verbose ) {
-                    HDfprintf(stdout, "%d:%s: send_mssg() failed on done.\n",
-                              world_mpi_rank, FUNC);
-                }
+                if(verbose)
+                    HDfprintf(stdout, "%d:%s: send_mssg() failed on done.\n", world_mpi_rank, FUNC);
             }
-        }
+        } /* end if */
 
-        if ( nerrors == 0 ) {
+        if(nerrors == 0) {
+            HDsprintf(trace_file_name, "t_cache_trace.txt.%d", (int)file_mpi_rank);
 
-        sprintf(trace_file_name, "t_cache_trace.txt.%d",
-            (int)file_mpi_rank);
-
-        if ( (trace_file_ptr = HDfopen(trace_file_name, "r")) == NULL ) {
+            if((trace_file_ptr = HDfopen(trace_file_name, "r")) == NULL ) {
 
                 nerrors++;
-                if ( verbose ) {
-                    HDfprintf(stdout, "%d:%s: HDfopen failed.\n",
-                              world_mpi_rank, FUNC);
-                }
+                if(verbose)
+                    HDfprintf(stdout, "%d:%s: HDfopen failed.\n", world_mpi_rank, FUNC);
             }
-    }
-
-    i = 0;
-    while ( ( nerrors == 0 ) && ( ! done ) )
-    {
-        if ( (*expected_output)[i] == NULL ) {
-
-        expected_line_len = 0;
-
-        } else {
-
-        expected_line_len = HDstrlen((*expected_output)[i]);
-        }
+        } /* end if */
 
-        if ( HDfgets(buffer, 255, trace_file_ptr) != NULL ) {
 
-            actual_line_len = HDstrlen(buffer);
-
-        } else {
-
-            actual_line_len = 0;
-        }
+        i = 0;
+        while((nerrors == 0) && (!done)) {
+            /* Get lines of actual and expected data */
+            if((*expected_output)[i] == NULL)
+                expected_line_len = (size_t)0;
+            else
+                expected_line_len = HDstrlen((*expected_output)[i]);
+
+            if(HDfgets(buffer, 255, trace_file_ptr) != NULL)
+                actual_line_len = HDstrlen(buffer);
+            else
+                actual_line_len = (size_t)0;
+
+            /* Compare the lines */
+            /* Handle running out of data */
+            if((actual_line_len == 0) || (expected_line_len == 0)) {
+                if((actual_line_len == 0) && (expected_line_len == 0)) {
+                    /* Both ran out at the same time - we're done */
+                    done = TRUE;
+                }
+                else {
+                    /* One ran out before the other - BADNESS */
+                    nerrors++;
+                    if(verbose) {
+                        HDfprintf(stdout, "%d:%s: Unexpected data in trace file line %d.\n", world_mpi_rank, FUNC, i);
+                        if(expected_line_len == 0) {
+                            HDfprintf(stdout, "%d:%s: expected = \"%s\" %d\n", world_mpi_rank, FUNC, "<EMPTY>", expected_line_len);
+                            HDfprintf(stdout, "%d:%s: actual   = \"%s\" %d\n", world_mpi_rank, FUNC, buffer, actual_line_len);
+                        }
+                        if(actual_line_len == 0) {
+                            HDfprintf(stdout, "%d:%s: expected = \"%s\" %d\n", world_mpi_rank, FUNC, (*expected_output)[i], expected_line_len);
+                            HDfprintf(stdout, "%d:%s: actual   = \"%s\" %d\n", world_mpi_rank, FUNC, "<EMPTY>", actual_line_len);
+                        }
+                    }
+                    HDfprintf(stdout, "BADNESS BADNESS BADNESS\n");
+                }
+            }
+            /* We directly compare the header line (line 0) */
+            else if(0 == i) {
+                if((actual_line_len != expected_line_len) || (HDstrcmp(buffer, (*expected_output)[i]) != 0 )) {
 
-        if ( ( actual_line_len == 0 ) && ( expected_line_len == 0 ) ) {
+                    nerrors++;
+                    if(verbose) {
+                        HDfprintf(stdout, "%d:%s: Unexpected data in trace file line %d.\n", world_mpi_rank, FUNC, i);
+                        HDfprintf(stdout, "%d:%s: expected = \"%s\" %d\n", world_mpi_rank, FUNC, (*expected_output)[i], expected_line_len);
+                        HDfprintf(stdout, "%d:%s: actual   = \"%s\" %d\n", world_mpi_rank, FUNC, buffer, actual_line_len);
+                    }
+                }
+            }
+            /* All other lines we tokenize and just compare the function name. This
+             * keeps the test from being too fragile.
+             */
+            else {
+                char *tok = NULL;     /* token for actual line */
 
-            done = TRUE;
+                tok = HDstrtok(buffer, " ");
 
-        } else if ( ( actual_line_len != expected_line_len ) ||
-                ( HDstrcmp(buffer, (*expected_output)[i]) != 0 ) ) {
+                if(HDstrcmp(tok, (*expected_output)[i]) != 0 ) {
 
-            nerrors++;
-                if ( verbose ) {
-                    HDfprintf(stdout,
-                "%d:%s: Unexpected data in trace file line %d.\n",
-                              world_mpi_rank, FUNC, i);
-            HDfprintf(stdout, "%d:%s: expected = \"%s\" %d\n",
-                world_mpi_rank, FUNC, (*expected_output)[i],
-                expected_line_len);
-            HDfprintf(stdout, "%d:%s: actual   = \"%s\" %d\n",
-                world_mpi_rank, FUNC, buffer,
-                actual_line_len);
+                    nerrors++;
+                    if(verbose) {
+                        HDfprintf(stdout, "%d:%s: Unexpected data in trace file line %d.\n", world_mpi_rank, FUNC, i);
+                        HDfprintf(stdout, "%d:%s: expected = \"%s\"\n", world_mpi_rank, FUNC, (*expected_output)[i]);
+                        HDfprintf(stdout, "%d:%s: actual   = \"%s\"\n", world_mpi_rank, FUNC, tok);
+                    }
                 }
-        } else {
-            i++;
-        }
-    }
+            } /* end else */
 
-    if ( trace_file_ptr != NULL ) {
+            i++;
+        } /* end while */
 
-        HDfclose(trace_file_ptr);
-        trace_file_ptr = NULL;
-#if 1
-        HDremove(trace_file_name);
-#endif
+        /* Clean up the trace file */
+        if(trace_file_ptr != NULL) {
+            HDfclose(trace_file_ptr);
+            trace_file_ptr = NULL;
+            HDremove(trace_file_name);
         }
-    }
+    } /* end giant else that runs clients */
 
     max_nerrors = get_max_nerrors();
 
-    if ( world_mpi_rank == 0 ) {
-
-    if ( max_nerrors == 0 ) {
-
-        PASSED();
-
-        } else {
+    if(world_mpi_rank == 0) {
 
+        if(max_nerrors == 0) {
+            PASSED();
+        }
+        else {
             failures++;
             H5_FAILED();
         }
     }
 
-    success = ( ( success ) && ( max_nerrors == 0 ) );
-
-#else /* H5_METADATA_TRACE_FILE */
-
-    if ( world_mpi_rank == 0 ) {
-
-        SKIPPED();
-
-        HDfprintf(stdout, " trace file support disabled.\n");
-    }
-
-#endif /* H5_METADATA_TRACE_FILE */
+    success = ((success) && (max_nerrors == 0));
 
     return(success);
 
diff --git a/testpar/t_dset.c b/testpar/t_dset.c
index 281d027..35501d8 100644
--- a/testpar/t_dset.c
+++ b/testpar/t_dset.c
@@ -2649,7 +2649,7 @@ compress_readAll(void)
 
             /* Try reading the data */
             ret = H5Dread(dataset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, xfer_plist, data_read);
-            VRFY((ret >= 0), "H5Pset_dxpl_mpio succeeded");
+            VRFY((ret >= 0), "H5Dread succeeded");
 
             /* Verify data read */
             for(u=0; u<dim; u++)
diff --git a/testpar/t_mdset.c b/testpar/t_mdset.c
index 5d989bb..16eb13c 100644
--- a/testpar/t_mdset.c
+++ b/testpar/t_mdset.c
@@ -12,6 +12,7 @@
  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
 #include "testphdf5.h"
+#include "H5Dprivate.h"
 
 #define DIM  2
 #define SIZE 32
@@ -311,13 +312,27 @@ void compact_dataset(void)
      VRFY((ret>= 0),"set independent IO collectively succeeded");
     }
 
-
     dataset = H5Dopen2(iof, dname, H5P_DEFAULT);
     VRFY((dataset >= 0), "H5Dopen2 succeeded");
 
+#ifdef H5_HAVE_INSTRUMENTED_LIBRARY
+    hbool_t prop_value;
+    prop_value = H5D_XFER_COLL_RANK0_BCAST_DEF;
+    ret = H5Pinsert2(dxpl, H5D_XFER_COLL_RANK0_BCAST_NAME, H5D_XFER_COLL_RANK0_BCAST_SIZE, &prop_value,
+                     NULL, NULL, NULL, NULL, NULL, NULL);
+    VRFY((ret >= 0), "H5Pinsert2() succeeded");
+#endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
+
     ret = H5Dread(dataset, H5T_NATIVE_DOUBLE, H5S_ALL, H5S_ALL, dxpl, inme);
     VRFY((ret >= 0), "H5Dread succeeded");
 
+#ifdef H5_HAVE_INSTRUMENTED_LIBRARY
+    prop_value = FALSE;
+    ret = H5Pget(dxpl, H5D_XFER_COLL_RANK0_BCAST_NAME, &prop_value);
+    VRFY((ret >= 0), "H5Pget succeeded");
+    VRFY((prop_value == FALSE && dxfer_coll_type == DXFER_COLLECTIVE_IO),"rank 0 Bcast optimization was performed for a compact dataset");
+#endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
+
     /* Verify data value */
     for(i = 0; i < size; i++)
         for(j = 0; j < size; j++)
@@ -603,8 +618,8 @@ void dataset_fillvalue(void)
     hsize_t     req_count[4] = {1, 6, 7, 8};
     hsize_t     dset_size;      /* Dataset size */
     int *rdata, *wdata;         /* Buffers for data to read and write */
-    int *twdata, *trdata;        /* Temporary pointer into buffer */
-    int acc, i, j, k, l;        /* Local index variables */
+    int *twdata, *trdata;       /* Temporary pointer into buffer */
+    int acc, i, j, k, l, ii;    /* Local index variables */
     herr_t ret;                 /* Generic return value */
     const char *filename;
 
@@ -645,27 +660,60 @@ void dataset_fillvalue(void)
     /*
      * Read dataset before any data is written.
      */
-    /* set entire read buffer with the constant 2 */
-    HDmemset(rdata,2,(size_t)(dset_size*sizeof(int)));
-    /* Independently read the entire dataset back */
-    ret = H5Dread(dataset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, rdata);
-    VRFY((ret >= 0), "H5Dread succeeded");
 
-    /* Verify all data read are the fill value 0 */
-    trdata = rdata;
-    err_num = 0;
-    for(i = 0; i < (int)dset_dims[0]; i++)
+    /* Create DXPL for I/O */
+    dxpl = H5Pcreate(H5P_DATASET_XFER);
+    VRFY((dxpl >= 0), "H5Pcreate succeeded");
+
+#ifdef H5_HAVE_INSTRUMENTED_LIBRARY
+      hbool_t prop_value;
+      prop_value = H5D_XFER_COLL_RANK0_BCAST_DEF;
+      ret = H5Pinsert2(dxpl, H5D_XFER_COLL_RANK0_BCAST_NAME, H5D_XFER_COLL_RANK0_BCAST_SIZE, &prop_value,
+                   NULL, NULL, NULL, NULL, NULL, NULL);
+      VRFY((ret >= 0),"testing property list inserted succeeded");
+#endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
+
+    for(ii = 0; ii < 2; ii++) {
+
+      if(ii == 0)
+        ret = H5Pset_dxpl_mpio(dxpl, H5FD_MPIO_INDEPENDENT);
+      else
+        ret = H5Pset_dxpl_mpio(dxpl, H5FD_MPIO_COLLECTIVE);
+      VRFY((ret >= 0), "H5Pset_dxpl_mpio succeeded");
+
+      /* set entire read buffer with the constant 2 */
+      HDmemset(rdata,2,(size_t)(dset_size*sizeof(int)));
+
+      /* Read the entire dataset back */
+      ret = H5Dread(dataset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, dxpl, rdata);
+      VRFY((ret >= 0), "H5Dread succeeded");
+
+#ifdef H5_HAVE_INSTRUMENTED_LIBRARY
+      prop_value = FALSE;
+      ret = H5Pget(dxpl, H5D_XFER_COLL_RANK0_BCAST_NAME, &prop_value);
+      VRFY((ret >= 0), "testing property list get succeeded");
+      if(ii == 0)
+        VRFY((prop_value == FALSE), "correctly handled rank 0 Bcast");
+      else
+        VRFY((prop_value == TRUE), "correctly handled rank 0 Bcast");
+#endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
+
+      /* Verify all data read are the fill value 0 */
+      trdata = rdata;
+      err_num = 0;
+      for(i = 0; i < (int)dset_dims[0]; i++)
         for(j = 0; j < (int)dset_dims[1]; j++)
-            for(k = 0; k < (int)dset_dims[2]; k++)
-                for(l = 0; l < (int)dset_dims[3]; l++, twdata++, trdata++)
-		    if(*trdata != 0)
-			if(err_num++ < MAX_ERR_REPORT || VERBOSE_MED)
-			    printf("Dataset Verify failed at [%d][%d][%d][%d]: expect 0, got %d\n", i, j, k, l, *trdata);
-    if(err_num > MAX_ERR_REPORT && !VERBOSE_MED)
+          for(k = 0; k < (int)dset_dims[2]; k++)
+            for(l = 0; l < (int)dset_dims[3]; l++, twdata++, trdata++)
+              if(*trdata != 0)
+                if(err_num++ < MAX_ERR_REPORT || VERBOSE_MED)
+                  printf("Dataset Verify failed at [%d][%d][%d][%d]: expect 0, got %d\n", i, j, k, l, *trdata);
+      if(err_num > MAX_ERR_REPORT && !VERBOSE_MED)
         printf("[more errors ...]\n");
-    if(err_num){
+      if(err_num) {
         printf("%d errors found in check_value\n", err_num);
-	nerrors++;
+        nerrors++;
+      }
     }
 
     /* Barrier to ensure all processes have completed the above test. */
@@ -681,10 +729,6 @@ void dataset_fillvalue(void)
     ret = H5Sselect_hyperslab(memspace, H5S_SELECT_SET, req_start, NULL, req_count, NULL);
     VRFY((ret >= 0), "H5Sselect_hyperslab succeeded on memory dataspace");
 
-    /* Create DXPL for collective I/O */
-    dxpl = H5Pcreate(H5P_DATASET_XFER);
-    VRFY((dxpl >= 0), "H5Pcreate succeeded");
-
     ret = H5Pset_dxpl_mpio(dxpl, H5FD_MPIO_COLLECTIVE);
     VRFY((ret >= 0), "H5Pset_dxpl_mpio succeeded");
     if(dxfer_coll_type == DXFER_INDEPENDENT_IO) {
@@ -711,37 +755,64 @@ void dataset_fillvalue(void)
     /*
      * Read dataset after partial write.
      */
-    /* set entire read buffer with the constant 2 */
-    HDmemset(rdata,2,(size_t)(dset_size*sizeof(int)));
-    /* Independently read the entire dataset back */
-    ret = H5Dread(dataset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, rdata);
-    VRFY((ret >= 0), "H5Dread succeeded");
 
-    /* Verify correct data read */
-    twdata=wdata;
-    trdata=rdata;
-    err_num=0;
-    for(i=0; i<(int)dset_dims[0]; i++)
+#ifdef H5_HAVE_INSTRUMENTED_LIBRARY
+      prop_value = H5D_XFER_COLL_RANK0_BCAST_DEF;
+      ret = H5Pset(dxpl, H5D_XFER_COLL_RANK0_BCAST_NAME, &prop_value);
+      VRFY((ret >= 0), " H5Pset succeeded");
+#endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
+
+    for(ii = 0; ii < 2; ii++) {
+
+      if(ii == 0)
+        ret = H5Pset_dxpl_mpio(dxpl, H5FD_MPIO_INDEPENDENT);
+      else
+        ret = H5Pset_dxpl_mpio(dxpl, H5FD_MPIO_COLLECTIVE);
+      VRFY((ret >= 0), "H5Pset_dxpl_mpio succeeded");
+
+      /* set entire read buffer with the constant 2 */
+      HDmemset(rdata,2,(size_t)(dset_size*sizeof(int)));
+
+      /* Read the entire dataset back */
+      ret = H5Dread(dataset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, dxpl, rdata);
+      VRFY((ret >= 0), "H5Dread succeeded");
+
+#ifdef H5_HAVE_INSTRUMENTED_LIBRARY
+      prop_value = FALSE;
+      ret = H5Pget(dxpl, H5D_XFER_COLL_RANK0_BCAST_NAME, &prop_value);
+      VRFY((ret >= 0), "testing property list get succeeded");
+      if(ii == 0)
+        VRFY((prop_value == FALSE), "correctly handled rank 0 Bcast");
+      else
+        VRFY((prop_value == TRUE), "correctly handled rank 0 Bcast");
+#endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
+
+      /* Verify correct data read */
+      twdata=wdata;
+      trdata=rdata;
+      err_num=0;
+      for(i=0; i<(int)dset_dims[0]; i++)
         for(j=0; j<(int)dset_dims[1]; j++)
-            for(k=0; k<(int)dset_dims[2]; k++)
-                for(l=0; l<(int)dset_dims[3]; l++, twdata++, trdata++)
-                    if(i<mpi_size) {
-                        if(*twdata != *trdata )
-                            if(err_num++ < MAX_ERR_REPORT || VERBOSE_MED)
-                                printf("Dataset Verify failed at [%d][%d][%d][%d]: expect %d, got %d\n", i,j,k,l, *twdata, *trdata);
-                    } /* end if */
-                    else {
-                        if(*trdata != 0)
-                            if(err_num++ < MAX_ERR_REPORT || VERBOSE_MED)
-                                printf("Dataset Verify failed at [%d][%d][%d][%d]: expect 0, got %d\n", i,j,k,l, *trdata);
-                    } /* end else */
-    if(err_num > MAX_ERR_REPORT && !VERBOSE_MED)
+          for(k=0; k<(int)dset_dims[2]; k++)
+            for(l=0; l<(int)dset_dims[3]; l++, twdata++, trdata++)
+              if(i<mpi_size) {
+                if(*twdata != *trdata )
+                  if(err_num++ < MAX_ERR_REPORT || VERBOSE_MED)
+                    printf("Dataset Verify failed at [%d][%d][%d][%d]: expect %d, got %d\n", i,j,k,l, *twdata, *trdata);
+              } /* end if */
+              else {
+                if(*trdata != 0)
+                  if(err_num++ < MAX_ERR_REPORT || VERBOSE_MED)
+                    printf("Dataset Verify failed at [%d][%d][%d][%d]: expect 0, got %d\n", i,j,k,l, *trdata);
+              } /* end else */
+      if(err_num > MAX_ERR_REPORT && !VERBOSE_MED)
         printf("[more errors ...]\n");
-    if(err_num){
+      if(err_num){
         printf("%d errors found in check_value\n", err_num);
-	nerrors++;
+        nerrors++;
+      }
     }
-
+    
     /* Close all file objects */
     ret = H5Dclose(dataset);
     VRFY((ret >= 0), "H5Dclose succeeded");
@@ -856,7 +927,7 @@ void collective_group_write(void)
         if(!((m+1) % 10)) {
             printf("created %d groups\n", m+1);
             MPI_Barrier(MPI_COMM_WORLD);
-	}
+        }
 #endif /* BARRIER_CHECKS */
     }
 
diff --git a/testpar/t_pflush1.c b/testpar/t_pflush1.c
index 4677bfe..27b561b 100644
--- a/testpar/t_pflush1.c
+++ b/testpar/t_pflush1.c
@@ -15,11 +15,11 @@
  * Programmer:  Leon Arber  <larber@uiuc.edu>
  *              Sept. 28, 2006.
  *
- * Purpose:    This is the first half of a two-part test that makes sure
- *        that a file can be read after a parallel application crashes as long
- *        as the file was flushed first.  We simulate a crash by
- *        calling _exit(0) since this doesn't flush HDF5 caches but
- *        still exits with success.
+ * Purpose:     This is the first half of a two-part test that makes sure
+ *              that a file can be read after a parallel application crashes
+ *              as long as the file was flushed first.  We simulate a crash by
+ *              calling _exit() since this doesn't flush HDF5 caches but
+ *              still exits with success.
  */
 #include "h5test.h"
 
@@ -29,171 +29,190 @@ const char *FILENAME[] = {
     NULL
 };
 
-static double    the_data[100][100];
+static int  data_g[100][100];
 
+#define N_GROUPS    100
+
+
 /*-------------------------------------------------------------------------
- * Function:    create_file
- *
- * Purpose:    Creates file used in part 1 of the test
+ * Function:    create_test_file
  *
- * Return:    Success:    0
+ * Purpose:     Creates the file used in part 1 of the test
  *
- *        Failure:    1
+ * Return:      Success:    A valid file ID
+ *              Failure:    H5I_INVALID_HID
  *
- * Programmer:    Leon Arber
+ * Programmer:  Leon Arber
  *              Sept. 26, 2006
  *
- * Modifications:
- *
  *-------------------------------------------------------------------------
  */
 static hid_t
-create_file(char* name, hid_t fapl)
+create_test_file(char *name, hid_t fapl_id)
 {
-    hid_t    file, dcpl, space, dset, groups, grp, plist;
-    hsize_t    ds_size[2] = {100, 100};
-    hsize_t    ch_size[2] = {5, 5};
-    hsize_t    i, j;
-
-
-
-    if((file=H5Fcreate(name, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0) goto error;
+    hid_t       fid             = H5I_INVALID_HID;
+    hid_t       dcpl_id         = H5I_INVALID_HID;
+    hid_t       sid             = H5I_INVALID_HID;
+    hid_t       did             = H5I_INVALID_HID;
+    hid_t       top_level_gid   = H5I_INVALID_HID;
+    hid_t       gid             = H5I_INVALID_HID;
+    hid_t       dxpl_id         = H5I_INVALID_HID;
+    hsize_t     dims[2]         = {100, 100};
+    hsize_t     chunk_dims[2]   = {5, 5};
+    hsize_t     i, j;
+
+    if((fid = H5Fcreate(name, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id)) < 0)
+        goto error;
 
     /* Create a chunked dataset */
-    if((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0) goto error;
-    if(H5Pset_chunk(dcpl, 2, ch_size) < 0) goto error;
-    if((space = H5Screate_simple(2, ds_size, NULL)) < 0) goto error;
-    if((dset = H5Dcreate2(file, "dset", H5T_NATIVE_FLOAT, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
-    goto error;
-
-    plist = H5Pcreate(H5P_DATASET_XFER);
-    H5Pset_dxpl_mpio(plist, H5FD_MPIO_COLLECTIVE);
-
+    if((dcpl_id = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        goto error;
+    if(H5Pset_chunk(dcpl_id, 2, chunk_dims) < 0)
+        goto error;
+    if((sid = H5Screate_simple(2, dims, NULL)) < 0)
+        goto error;
+    if((did = H5Dcreate2(fid, "dset", H5T_NATIVE_INT, sid, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
+        goto error;
+
+    if((dxpl_id = H5Pcreate(H5P_DATASET_XFER)) < 0)
+        goto error;
+    if(H5Pset_dxpl_mpio(dxpl_id, H5FD_MPIO_COLLECTIVE) < 0)
+        goto error;
 
     /* Write some data */
-    for(i = 0; i < ds_size[0]; i++) {
-    /*
-    * The extra cast in the following statement is a bug workaround
-    * for the Win32 version 5.0 compiler.
-    * 1998-11-06 ptl
-    */
-    for(j = 0; j < ds_size[1]; j++)
-        the_data[i][j] = (double)(hssize_t)i/(hssize_t)(j+1);
-    }
-    if(H5Dwrite(dset, H5T_NATIVE_DOUBLE, space, space, plist, the_data) < 0) goto error;
+    for(i = 0; i < dims[0]; i++)
+        for(j = 0; j < dims[1]; j++)
+            data_g[i][j] = (int)(i + (i * j) + j);
+
+    if(H5Dwrite(did, H5T_NATIVE_INT, sid, sid, dxpl_id, data_g) < 0)
+        goto error;
 
     /* Create some groups */
-    if((groups = H5Gcreate2(file, "some_groups", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) goto error;
-    for(i = 0; i < 100; i++) {
-    sprintf(name, "grp%02u", (unsigned)i);
-    if((grp = H5Gcreate2(groups, name, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0) goto error;
-    if(H5Gclose(grp) < 0) goto error;
+    if((top_level_gid = H5Gcreate2(fid, "some_groups", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
+        goto error;
+    for(i = 0; i < N_GROUPS; i++) {
+        HDsprintf(name, "grp%02u", (unsigned)i);
+        if((gid = H5Gcreate2(top_level_gid, name, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
+            goto error;
+        if(H5Gclose(gid) < 0)
+            goto error;
     }
 
-    return file;
+    return fid;
 
 error:
-    HD_exit(1);
-}
+    return H5I_INVALID_HID;
+} /* end create_test_file() */
 
+
 /*-------------------------------------------------------------------------
  * Function:    main
  *
- * Purpose:    Part 1 of a two-part H5Fflush() test.
- *
- * Return:    Success:    0
+ * Purpose:     Part 1 of a two-part parallel H5Fflush() test.
  *
- *        Failure:    1
+ * Return:      EXIT_FAILURE (always)
  *
- * Programmer:    Robb Matzke
+ * Programmer:  Robb Matzke
  *              Friday, October 23, 1998
  *
- * Modifications:
- *         Leon Arber
- *         Sept. 26, 2006, expand test to check for failure if H5Fflush is not called.
- *
- *
  *-------------------------------------------------------------------------
  */
 int
 main(int argc, char* argv[])
 {
-    hid_t file1, file2, fapl;
-    MPI_File    *mpifh_p = NULL;
-    char    name[1024];
-    const char  *envval = NULL;
-    int mpi_size, mpi_rank;
-    MPI_Comm comm  = MPI_COMM_WORLD;
-    MPI_Info info  = MPI_INFO_NULL;
+    hid_t       fid1        = H5I_INVALID_HID;
+    hid_t       fid2        = H5I_INVALID_HID;
+    hid_t       fapl_id     = H5I_INVALID_HID;
+    MPI_File    *mpifh_p    = NULL;
+    char        name[1024];
+    const char  *envval     = NULL;
+    int         mpi_size;
+    int         mpi_rank;
+    MPI_Comm    comm        = MPI_COMM_WORLD;
+    MPI_Info    info        = MPI_INFO_NULL;
 
     MPI_Init(&argc, &argv);
     MPI_Comm_size(comm, &mpi_size);
     MPI_Comm_rank(comm, &mpi_rank);
 
-    fapl = H5Pcreate(H5P_FILE_ACCESS);
-    H5Pset_fapl_mpio(fapl, comm, info);
-
     if(mpi_rank == 0)
-    TESTING("H5Fflush (part1)");
+        TESTING("H5Fflush (part1)");
+
+    /* Don't run using the split VFD */
     envval = HDgetenv("HDF5_DRIVER");
     if(envval == NULL)
         envval = "nomatch";
-    if(HDstrcmp(envval, "split")) {
+
+    if(!HDstrcmp(envval, "split")) {
+        if(mpi_rank == 0) {
+            SKIPPED();
+            HDputs("    Test not compatible with current Virtual File Driver");
+        }
+        MPI_Finalize();
+        HDexit(EXIT_FAILURE);
+    }
+
+    if((fapl_id = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        goto error;
+    if(H5Pset_fapl_mpio(fapl_id, comm, info) < 0)
+        goto error;
+
     /* Create the file */
-    h5_fixname(FILENAME[0], fapl, name, sizeof name);
-    file1 = create_file(name, fapl);
+    h5_fixname(FILENAME[0], fapl_id, name, sizeof(name));
+    if((fid1 = create_test_file(name, fapl_id)) < 0)
+        goto error;
     /* Flush and exit without closing the library */
-    if(H5Fflush(file1, H5F_SCOPE_GLOBAL) < 0) goto error;
+    if(H5Fflush(fid1, H5F_SCOPE_GLOBAL) < 0)
+        goto error;
 
     /* Create the other file which will not be flushed */
-    h5_fixname(FILENAME[1], fapl, name, sizeof name);
-    file2 = create_file(name, fapl);
-
+    h5_fixname(FILENAME[1], fapl_id, name, sizeof(name));
+    if((fid2 = create_test_file(name, fapl_id)) < 0)
+        goto error;
 
     if(mpi_rank == 0)
         PASSED();
-    fflush(stdout);
-    fflush(stderr);
-    } /* end if */
-    else {
-        SKIPPED();
-        puts("    Test not compatible with current Virtual File Driver");
-    } /* end else */
-
-    /*
-     * Some systems like AIX do not like files not closed when MPI_Finalize
+
+    HDfflush(stdout);
+    HDfflush(stderr);
+
+    /* Some systems like AIX do not like files not being closed when MPI_Finalize
      * is called.  So, we need to get the MPI file handles, close them by hand.
      * Then the _exit is still needed to stop at_exit from happening in some systems.
      * Note that MPIO VFD returns the address of the file-handle in the VFD struct
      * because MPI_File_close wants to modify the file-handle variable.
      */
 
-    /* close file1 */
-    if(H5Fget_vfd_handle(file1, fapl, (void **)&mpifh_p) < 0) {
-    printf("H5Fget_vfd_handle for file1 failed\n");
-    goto error;
-    } /* end if */
-    if(MPI_File_close(mpifh_p) != MPI_SUCCESS) {
-    printf("MPI_File_close for file1 failed\n");
-    goto error;
-    } /* end if */
-    /* close file2 */
-    if(H5Fget_vfd_handle(file2, fapl, (void **)&mpifh_p) < 0) {
-    printf("H5Fget_vfd_handle for file2 failed\n");
-    goto error;
-    } /* end if */
-    if(MPI_File_close(mpifh_p) != MPI_SUCCESS) {
-    printf("MPI_File_close for file2 failed\n");
-    goto error;
-    } /* end if */
-
-    fflush(stdout);
-    fflush(stderr);
-    HD_exit(0);
+    /* Close file 1 */
+    if(H5Fget_vfd_handle(fid1, fapl_id, (void **)&mpifh_p) < 0)
+        goto error;
+    if(MPI_File_close(mpifh_p) != MPI_SUCCESS)
+        goto error;
+
+    /* Close file 2 */
+    if(H5Fget_vfd_handle(fid2, fapl_id, (void **)&mpifh_p) < 0)
+        goto error;
+    if(MPI_File_close(mpifh_p) != MPI_SUCCESS)
+        goto error;
+
+    HDfflush(stdout);
+    HDfflush(stderr);
+
+    /* Always exit with a failure code!
+     *
+     * In accordance with the standard, not having all processes
+     * call MPI_Finalize() can be considered an error, so mpiexec
+     * et al. may indicate failure on return. It's much easier to
+     * always ignore the failure condition than to handle some
+     * platforms returning success and others failure.
+     */
+    HD_exit(EXIT_FAILURE);
 
 error:
-    fflush(stdout);
-    fflush(stderr);
-    HD_exit(1);
-}
+    HDfflush(stdout);
+    HDfflush(stderr);
+    HDprintf("*** ERROR ***\n");
+    HDprintf("THERE WAS A REAL ERROR IN t_pflush1.\n");
+    HD_exit(EXIT_FAILURE);
+} /* end main() */
 
diff --git a/testpar/t_pflush2.c b/testpar/t_pflush2.c
index 2051f4e..f58e5a5 100644
--- a/testpar/t_pflush2.c
+++ b/testpar/t_pflush2.c
@@ -30,116 +30,124 @@ const char *FILENAME[] = {
     NULL
 };
 
-static double	the_data[100][100];
+static int  data_g[100][100];
 
+#define N_GROUPS    100
 
 /*-------------------------------------------------------------------------
- * Function:	check_file
+ * Function:    check_test_file
  *
- * Purpose:	Part 2 of a two-part H5Fflush() test.
+ * Purpose:     Part 2 of a two-part H5Fflush() test.
  *
- * Return:	Success:	0
+ * Return:      SUCCEED/FAIL
  *
- *		Failure:	1
- *
- * Programmer:	Leon Arber
+ * Programmer:  Leon Arber
  *              Sept. 26, 2006.
  *
  *-------------------------------------------------------------------------
  */
-static int
-check_file(char* name, hid_t fapl)
+static herr_t
+check_test_file(char* name, hid_t fapl_id)
 {
-    hid_t	file, space, dset, groups, grp, plist;
-    hsize_t	ds_size[2];
-    double	error;
-    hsize_t	i, j;
-
-    plist = H5Pcreate(H5P_DATASET_XFER);
-    H5Pset_dxpl_mpio(plist, H5FD_MPIO_COLLECTIVE);
-    if((file = H5Fopen(name, H5F_ACC_RDONLY, fapl)) < 0) goto error;
+    hid_t       fid             = H5I_INVALID_HID;
+    hid_t       sid             = H5I_INVALID_HID;
+    hid_t       did             = H5I_INVALID_HID;
+    hid_t       top_level_gid   = H5I_INVALID_HID;
+    hid_t       gid             = H5I_INVALID_HID;
+    hid_t       dxpl_id         = H5I_INVALID_HID;
+    hsize_t     dims[2];
+    int         val;
+    hsize_t     i, j;
+
+    if((dxpl_id = H5Pcreate(H5P_DATASET_XFER)) < 0)
+        goto error;
+    if(H5Pset_dxpl_mpio(dxpl_id, H5FD_MPIO_COLLECTIVE) < 0)
+        goto error;
+    if((fid = H5Fopen(name, H5F_ACC_RDONLY, fapl_id)) < 0)
+        goto error;
 
     /* Open the dataset */
-    if((dset = H5Dopen2(file, "dset", H5P_DEFAULT)) < 0) goto error;
-    if((space = H5Dget_space(dset)) < 0) goto error;
-    if(H5Sget_simple_extent_dims(space, ds_size, NULL) < 0) goto error;
-    assert(100==ds_size[0] && 100==ds_size[1]);
+    if((did = H5Dopen2(fid, "dset", H5P_DEFAULT)) < 0)
+        goto error;
+    if((sid = H5Dget_space(did)) < 0)
+        goto error;
+    if(H5Sget_simple_extent_dims(sid, dims, NULL) < 0)
+        goto error;
+    HDassert(100 == dims[0] && 100 == dims[1]);
 
     /* Read some data */
-    if (H5Dread(dset, H5T_NATIVE_DOUBLE, space, space, plist,
-		the_data) < 0) goto error;
-    for (i=0; i<ds_size[0]; i++) {
-	for (j=0; j<ds_size[1]; j++) {
-	    /*
-	     * The extra cast in the following statement is a bug workaround
-	     * for the Win32 version 5.0 compiler.
-	     * 1998-11-06 ptl
-	     */
-	    error = fabs(the_data[i][j]-(double)(hssize_t)i/((hssize_t)j+1));
-	    if (error>0.0001) {
-		H5_FAILED();
-		printf("    dset[%lu][%lu] = %g\n",
-			(unsigned long)i, (unsigned long)j, the_data[i][j]);
-		printf("    should be %g\n",
-			(double)(hssize_t)i/(hssize_t)(j+1));
-		goto error;
-	    }
-	}
+    if(H5Dread(did, H5T_NATIVE_INT, sid, sid, dxpl_id, data_g) < 0)
+        goto error;
+    for(i = 0; i < dims[0]; i++) {
+        for(j = 0; j < dims[1]; j++) {
+            val = (int)(i + (i * j) + j);
+            if(data_g[i][j] != val) {
+                H5_FAILED();
+                HDprintf("    data_g[%lu][%lu] = %d\n", (unsigned long)i, (unsigned long)j, data_g[i][j]);
+                HDprintf("    should be %d\n", val);
+            }
+        }
     }
 
     /* Open some groups */
-    if((groups = H5Gopen2(file, "some_groups", H5P_DEFAULT)) < 0) goto error;
-    for(i = 0; i < 100; i++) {
-	sprintf(name, "grp%02u", (unsigned)i);
-	if((grp = H5Gopen2(groups, name, H5P_DEFAULT)) < 0) goto error;
-	if(H5Gclose(grp) < 0) goto error;
+    if((top_level_gid = H5Gopen2(fid, "some_groups", H5P_DEFAULT)) < 0)
+        goto error;
+    for(i = 0; i < N_GROUPS; i++) {
+        HDsprintf(name, "grp%02u", (unsigned)i);
+        if((gid = H5Gopen2(top_level_gid, name, H5P_DEFAULT)) < 0)
+            goto error;
+        if(H5Gclose(gid) < 0)
+            goto error;
     }
 
-    if(H5Gclose(groups) < 0) goto error;
-    if(H5Dclose(dset) < 0) goto error;
-    if(H5Fclose(file) < 0) goto error;
-    if(H5Pclose(plist) < 0) goto error;
-    if(H5Sclose(space) < 0) goto error;
+    if(H5Gclose(top_level_gid) < 0)
+        goto error;
+    if(H5Dclose(did) < 0)
+        goto error;
+    if(H5Fclose(fid) < 0)
+        goto error;
+    if(H5Pclose(dxpl_id) < 0)
+        goto error;
+    if(H5Sclose(sid) < 0)
+        goto error;
 
-    return 0;
+    return SUCCEED;
 
 error:
     H5E_BEGIN_TRY {
-        H5Pclose(plist);
-        H5Gclose(groups);
-        H5Dclose(dset);
-        H5Fclose(file);
-        H5Sclose(space);
+        H5Pclose(dxpl_id);
+        H5Gclose(top_level_gid);
+        H5Dclose(did);
+        H5Fclose(fid);
+        H5Sclose(sid);
+        H5Gclose(gid);
     } H5E_END_TRY;
-    return 1;
-}
+    return FAIL;
+} /* end check_test_file() */
 
 /*-------------------------------------------------------------------------
- * Function:	main
+ * Function:    main
  *
- * Purpose:	Part 2 of a two-part H5Fflush() test.
+ * Purpose:     Part 2 of a two-part H5Fflush() test.
  *
- * Return:	Success:	0
+ * Return:      EXIT_SUCCESS/EXIT_FAIL
  *
- *		Failure:	1
- *
- * Programmer:	Robb Matzke
+ * Programmer:  Robb Matzke
  *              Friday, October 23, 1998
  *
- * Modifications:
- * 		Leon Arber
- * 		Sept. 26, 2006, expand to check for case where the was file not flushed.
- *
  *-------------------------------------------------------------------------
  */
 int
-main(int argc, char* argv[])
+main(int argc, char *argv[])
 {
+    hid_t       fapl_id1    = H5I_INVALID_HID;
+    hid_t       fapl_id2    = H5I_INVALID_HID;
     H5E_auto2_t func;
-    char	name[1024];
+    char        name[1024];
     const char *envval = NULL;
 
-    int mpi_size, mpi_rank;
+    int mpi_size;
+    int mpi_rank;
     MPI_Comm comm  = MPI_COMM_WORLD;
     MPI_Info info  = MPI_INFO_NULL;
 
@@ -148,69 +156,70 @@ main(int argc, char* argv[])
     MPI_Comm_rank(comm, &mpi_rank);
 
     if(mpi_rank == 0)
-	TESTING("H5Fflush (part2 with flush)");
+        TESTING("H5Fflush (part2 with flush)");
 
-    /* Don't run this test using the core or split file drivers */
+    /* Don't run using the split VFD */
     envval = HDgetenv("HDF5_DRIVER");
-    if (envval == NULL)
+    if(envval == NULL)
         envval = "nomatch";
-    if (HDstrcmp(envval, "core") && HDstrcmp(envval, "split")) {
-        hid_t fapl1, fapl2;
-
-        fapl1 = H5Pcreate(H5P_FILE_ACCESS);
-        H5Pset_fapl_mpio(fapl1, comm, info);
-
-        fapl2 = H5Pcreate(H5P_FILE_ACCESS);
-        H5Pset_fapl_mpio(fapl2, comm, info);
-
-	/* Check the case where the file was flushed */
-	h5_fixname(FILENAME[0], fapl1, name, sizeof name);
-	if(check_file(name, fapl1))
-	{
-	    H5_FAILED()
-	    goto error;
-	}
-	else if(mpi_rank == 0)
-	{
-	    PASSED()
-	}
-
-	/* Check the case where the file was not flushed.  This should give an error
-	 * so we turn off the error stack temporarily */
-	if(mpi_rank == 0)
-	    TESTING("H5Fflush (part2 without flush)");
-	H5Eget_auto2(H5E_DEFAULT,&func,NULL);
-	H5Eset_auto2(H5E_DEFAULT, NULL, NULL);
-
-	h5_fixname(FILENAME[1], fapl2, name, sizeof name);
-	if(check_file(name, fapl2))
-	{
-	    if(mpi_rank == 0)
-	    {
-		PASSED()
-	    }
-	}
-	else
-	{
-	    H5_FAILED()
-	    goto error;
-	}
-	H5Eset_auto2(H5E_DEFAULT, func, NULL);
-
-
-	h5_clean_files(&FILENAME[0], fapl1);
-	h5_clean_files(&FILENAME[1], fapl2);
+
+    if(!HDstrcmp(envval, "split")) {
+        if(mpi_rank == 0) {
+            SKIPPED();
+            HDputs("    Test not compatible with current Virtual File Driver");
+        }
+        MPI_Finalize();
+        HDexit(EXIT_FAILURE);
+    }
+
+    if((fapl_id1 = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        goto error;
+    if(H5Pset_fapl_mpio(fapl_id1, comm, info) < 0)
+        goto error;
+
+    if((fapl_id2 = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        goto error;
+    if(H5Pset_fapl_mpio(fapl_id2, comm, info) < 0)
+        goto error;
+
+    /* Check the case where the file was flushed */
+    h5_fixname(FILENAME[0], fapl_id1, name, sizeof(name));
+    if(check_test_file(name, fapl_id1)) {
+        H5_FAILED()
+        goto error;
     }
-    else
-    {
-        SKIPPED();
-        puts("    Test not compatible with current Virtual File Driver");
+    else if(mpi_rank == 0) {
+        PASSED()
     }
 
+    /* Check the case where the file was not flushed.  This should give an error
+     * so we turn off the error stack temporarily.
+     */
+    if(mpi_rank == 0)
+        TESTING("H5Fflush (part2 without flush)");
+    H5Eget_auto2(H5E_DEFAULT,&func, NULL);
+    H5Eset_auto2(H5E_DEFAULT, NULL, NULL);
+
+    h5_fixname(FILENAME[1], fapl_id2, name, sizeof(name));
+    if(check_test_file(name, fapl_id2)) {
+        if(mpi_rank == 0)
+            PASSED()
+    }
+    else {
+        H5_FAILED()
+        goto error;
+    }
+
+    H5Eset_auto2(H5E_DEFAULT, func, NULL);
+
+    h5_clean_files(&FILENAME[0], fapl_id1);
+    h5_clean_files(&FILENAME[1], fapl_id2);
+
     MPI_Finalize();
-    return 0;
 
-    error:
-        return 1;
-}
+    HDexit(EXIT_SUCCESS);
+
+error:
+    HDexit(EXIT_FAILURE);
+} /* end main() */
 
diff --git a/testpar/t_pread.c b/testpar/t_pread.c
index 0905d44..74feeb6 100644
--- a/testpar/t_pread.c
+++ b/testpar/t_pread.c
@@ -17,6 +17,7 @@
  */
 
 #include "testpar.h"
+#include "H5Dprivate.h"
 
 /* The collection of files is included below to aid
  * an external "cleanup" process if required.
@@ -34,6 +35,8 @@ const char *FILENAMES[NFILENAME + 1]={"reloc_t_pread_data_file",
 
 #define COUNT 1000
 
+#define LIMIT_NPROC 6
+
 hbool_t pass = true;
 static const char *random_hdf5_text =
 "Now is the time for all first-time-users of HDF5 to read their \
@@ -46,7 +49,7 @@ completely foolproof is to underestimate the ingenuity of complete\n\
 fools.\n";
 
 static int generate_test_file(MPI_Comm comm, int mpi_rank, int group);
-static int test_parallel_read(MPI_Comm comm, int mpi_rank, int group);
+static int test_parallel_read(MPI_Comm comm, int mpi_rank, int mpi_size, int group);
 
 static char *test_argv0 = NULL;
 
@@ -108,6 +111,9 @@ generate_test_file( MPI_Comm comm, int mpi_rank, int group_id )
     hid_t fapl_id   = -1;
     hid_t dxpl_id   = -1;
     hid_t dset_id   = -1;
+    hid_t dset_id_ch = -1;
+    hid_t dcpl_id = H5P_DEFAULT;
+    hsize_t chunk[1];
     float nextValue;
     float *data_slice = NULL;
 
@@ -272,6 +278,55 @@ generate_test_file( MPI_Comm comm, int mpi_rank, int group_id )
         }
     }
 
+
+    /* create a chunked dataset */
+    chunk[0] = COUNT/8;
+    
+    if ( pass ) {
+      if ( (dcpl_id = H5Pcreate (H5P_DATASET_CREATE)) < 0 ) {
+        pass = false;
+          failure_mssg = "H5Pcreate() failed.\n";
+      }
+    }
+
+    if ( pass ) {
+      if ( (H5Pset_chunk (dcpl_id, 1, chunk) ) < 0 ) {
+        pass = false;
+        failure_mssg = "H5Pset_chunk() failed.\n";
+      }
+    }
+    
+    if ( pass ) {
+      
+      if ( (dset_id_ch = H5Dcreate2(file_id, "dataset0_chunked", H5T_NATIVE_FLOAT,
+                                    filespace, H5P_DEFAULT, dcpl_id,
+                                    H5P_DEFAULT)) < 0 ) {
+        pass = false;
+        failure_mssg = "H5Dcreate2() failed.\n";
+      }
+    }
+
+    if ( pass ) {
+      if ( (H5Dwrite(dset_id_ch, H5T_NATIVE_FLOAT, memspace,
+                     filespace, dxpl_id, data_slice)) < 0 ) {
+        pass = false;
+        failure_mssg = "H5Dwrite() failed.\n";
+      }
+    }
+    if ( pass || (dcpl_id != -1)) {
+      if ( H5Pclose(dcpl_id) < 0 ) {
+        pass = false;
+        failure_mssg = "H5Pclose(dcpl_id) failed.\n";
+      }
+    }
+    
+    if ( pass || (dset_id_ch != -1)) {
+      if ( H5Dclose(dset_id_ch) < 0 ) {
+        pass = false;
+        failure_mssg = "H5Dclose(dset_id_ch) failed.\n";
+      }
+    }
+
     /* close file, etc. */
     if ( pass || (dset_id != -1)) {
         if ( H5Dclose(dset_id) < 0 ) {
@@ -413,7 +468,7 @@ generate_test_file( MPI_Comm comm, int mpi_rank, int group_id )
  * Function:    test_parallel_read
  *
  * Purpose:     This actually tests the superblock optimization
- *              and covers the two primary cases we're interested in.
+ *              and covers the three primary cases we're interested in.
  *              1). That HDF5 files can be opened in parallel by
  *                  the rank 0 process and that the superblock
  *                  offset is correctly broadcast to the other
@@ -423,6 +478,10 @@ generate_test_file( MPI_Comm comm, int mpi_rank, int group_id )
  *                  subgroups of MPI_COMM_WORLD and that each
  *                  subgroup operates as described in (1) to
  *                  collectively read the data.
+ *              3). Testing proc0-read-and-MPI_Bcast using
+ *                  sub-communicators, and reading into
+ *                  a memory space that is different from the
+ *                  file space, and chunked datasets.
  *
  *              The global MPI rank is used for reading and
  *              writing data for process specific data in the
@@ -444,7 +503,7 @@ generate_test_file( MPI_Comm comm, int mpi_rank, int group_id )
  *-------------------------------------------------------------------------
  */
 static int
-test_parallel_read(MPI_Comm comm, int mpi_rank, int group_id)
+test_parallel_read(MPI_Comm comm, int mpi_rank, int mpi_size, int group_id)
 {
     const char *failure_mssg;
     const char *fcn_name = "test_parallel_read()";
@@ -457,8 +516,13 @@ test_parallel_read(MPI_Comm comm, int mpi_rank, int group_id)
     hid_t fapl_id   = -1;
     hid_t file_id   = -1;
     hid_t dset_id   = -1;
+    hid_t dset_id_ch = -1;
+    hid_t dxpl_id   = H5P_DEFAULT;
     hid_t memspace  = -1;
     hid_t filespace = -1;
+    hid_t filetype  = -1;
+    size_t filetype_size;
+    hssize_t dset_size;
     hsize_t i;
     hsize_t offset;
     hsize_t count = COUNT;
@@ -552,6 +616,14 @@ test_parallel_read(MPI_Comm comm, int mpi_rank, int group_id)
         }
     }
 
+    /* open the chunked data set */
+    if ( pass ) {
+      if ( (dset_id_ch = H5Dopen2(file_id, "dataset0_chunked", H5P_DEFAULT)) < 0 ) {
+        pass = FALSE;
+        failure_mssg = "H5Dopen2() failed\n";
+      }
+    }
+
     /* setup memspace */
     if ( pass ) {
         dims[0] = count;
@@ -606,14 +678,6 @@ test_parallel_read(MPI_Comm comm, int mpi_rank, int group_id)
         }
     }
 
-    /* close file, etc. */
-    if ( pass || (dset_id != -1) ) {
-        if ( H5Dclose(dset_id) < 0 ) {
-            pass = false;
-            failure_mssg = "H5Dclose(dset_id) failed.\n";
-        }
-    }
-
     if ( pass || (memspace != -1) ) {
         if ( H5Sclose(memspace) < 0 ) {
             pass = false;
@@ -628,6 +692,330 @@ test_parallel_read(MPI_Comm comm, int mpi_rank, int group_id)
         }
     }
 
+    /* free data_slice if it has been allocated */
+    if ( data_slice != NULL ) {
+        HDfree(data_slice);
+        data_slice = NULL;
+    }
+
+    /* 
+     * Test reading proc0-read-and-bcast with sub-communicators 
+     */
+
+    /* Don't test with more than LIMIT_NPROC processes to avoid memory issues */
+
+    if( group_size <= LIMIT_NPROC ) {
+#ifdef H5_HAVE_INSTRUMENTED_LIBRARY
+      hbool_t prop_value;
+#endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
+
+      if ( (filespace = H5Dget_space(dset_id )) < 0 ) {
+        pass = FALSE;
+        failure_mssg = "H5Dget_space failed.\n";
+      }
+
+      if ( (dset_size = H5Sget_simple_extent_npoints(filespace)) < 0 ) {
+        pass = FALSE;
+        failure_mssg = "H5Sget_simple_extent_npoints failed.\n";
+      }
+
+      if ( (filetype = H5Dget_type(dset_id)) < 0 ) {
+        pass = FALSE;
+        failure_mssg = "H5Dget_type failed.\n";
+      }
+
+      if ( (filetype_size = H5Tget_size(filetype)) == 0 ) {
+        pass = FALSE;
+        failure_mssg = "H5Tget_size failed.\n";
+      }
+
+      if ( H5Tclose(filetype) < 0 ) {
+        pass = FALSE;
+        failure_mssg = "H5Tclose failed.\n";
+      };
+
+      if ( (data_slice = (float *)HDmalloc((size_t)dset_size*filetype_size)) == NULL ) {
+        pass = FALSE;
+        failure_mssg = "malloc of data_slice failed.\n";
+      }
+
+      if ( pass ) {
+        if ( (dxpl_id = H5Pcreate(H5P_DATASET_XFER)) < 0 ) {
+          pass = FALSE;
+          failure_mssg = "H5Pcreate(H5P_DATASET_XFER) failed.\n";
+        }
+      }
+
+      if ( pass ) {
+        if ( (H5Pset_dxpl_mpio(dxpl_id, H5FD_MPIO_COLLECTIVE)) < 0 ) {
+          pass = FALSE;
+          failure_mssg = "H5Pset_dxpl_mpio() failed.\n";
+        }
+      }
+
+#ifdef H5_HAVE_INSTRUMENTED_LIBRARY
+      if ( pass ) {
+        prop_value = H5D_XFER_COLL_RANK0_BCAST_DEF;
+        if(H5Pinsert2(dxpl_id, H5D_XFER_COLL_RANK0_BCAST_NAME, H5D_XFER_COLL_RANK0_BCAST_SIZE, &prop_value,
+                   NULL, NULL, NULL, NULL, NULL, NULL) < 0) {
+            pass = FALSE;
+            failure_mssg = "H5Pinsert2() failed\n";
+        }
+      }
+#endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
+
+      /* read H5S_ALL section */
+      if ( pass ) {
+        if ( (H5Dread(dset_id, H5T_NATIVE_FLOAT, H5S_ALL,
+                      H5S_ALL, dxpl_id, data_slice)) < 0 ) {
+          pass = FALSE;
+          failure_mssg = "H5Dread() failed\n";
+        }
+      }
+
+#ifdef H5_HAVE_INSTRUMENTED_LIBRARY
+      if ( pass ) {
+        prop_value = FALSE;
+        if(H5Pget(dxpl_id, H5D_XFER_COLL_RANK0_BCAST_NAME, &prop_value) < 0) {
+            pass = FALSE;
+            failure_mssg = "H5Pget() failed\n";
+        }
+        if (pass) {
+          if(prop_value != TRUE) {
+            pass = FALSE;
+            failure_mssg = "rank 0 Bcast optimization was mistakenly not performed\n";
+          }
+        }
+      }
+#endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
+
+      /* verify the data */
+      if ( pass ) {
+
+        if ( comm == MPI_COMM_WORLD )       /* test 1 */
+          nextValue = 0;
+        else if ( group_id == 0 )           /* test 2 group 0 */
+          nextValue = 0;
+        else                                /* test 2 group 1 */
+          nextValue = (float)((hsize_t)( mpi_size / 2 )*count);
+        
+        i = 0;
+        while ( ( pass ) && ( i < (hsize_t)dset_size ) ) {
+          /* what we really want is data_slice[i] != nextValue --
+           * the following is a circumlocution to shut up the
+           * the compiler.
+           */
+          if ( ( data_slice[i] > nextValue ) ||
+               ( data_slice[i] < nextValue ) ) {
+            pass = FALSE;
+            failure_mssg = "Unexpected dset contents.\n";
+          }
+          nextValue += 1;
+          i++;
+        }
+      }
+
+      /* read H5S_ALL section for the chunked dataset */
+
+#ifdef H5_HAVE_INSTRUMENTED_LIBRARY
+      if ( pass ) {
+        prop_value = H5D_XFER_COLL_RANK0_BCAST_DEF;
+        if(H5Pset(dxpl_id, H5D_XFER_COLL_RANK0_BCAST_NAME, &prop_value) < 0) {
+            pass = FALSE;
+            failure_mssg = "H5Pset() failed\n";
+        }
+      }
+#endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
+
+      for ( i = 0; i < (hsize_t)dset_size; i++) {
+        data_slice[i] = 0;
+      }
+      if ( pass ) {
+        if ( (H5Dread(dset_id_ch, H5T_NATIVE_FLOAT, H5S_ALL,
+                      H5S_ALL, dxpl_id, data_slice)) < 0 ) {
+          pass = FALSE;
+          failure_mssg = "H5Dread() failed\n";
+        }
+      }
+
+#ifdef H5_HAVE_INSTRUMENTED_LIBRARY
+      if ( pass ) {
+        prop_value = FALSE;
+        if(H5Pget(dxpl_id, H5D_XFER_COLL_RANK0_BCAST_NAME, &prop_value) < 0) {
+            pass = FALSE;
+            failure_mssg = "H5Pget() failed\n";
+        }
+        if (pass) {
+          if(prop_value == TRUE) {
+            pass = FALSE;
+            failure_mssg = "rank 0 Bcast optimization was mistakenly performed for chunked dataset\n";
+          }
+        }
+      }
+#endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
+
+      /* verify the data */
+      if ( pass ) {
+
+        if ( comm == MPI_COMM_WORLD )       /* test 1 */
+          nextValue = 0;
+        else if ( group_id == 0 )           /* test 2 group 0 */
+          nextValue = 0;
+        else                                /* test 2 group 1 */
+          nextValue = (float)((hsize_t)( mpi_size / 2 )*count);
+        
+        i = 0;
+        while ( ( pass ) && ( i < (hsize_t)dset_size ) ) {
+          /* what we really want is data_slice[i] != nextValue --
+           * the following is a circumlocution to shut up the
+           * the compiler.
+           */
+          if ( ( data_slice[i] > nextValue ) ||
+               ( data_slice[i] < nextValue ) ) {
+            pass = FALSE;
+            failure_mssg = "Unexpected chunked dset contents.\n";
+          }
+          nextValue += 1;
+          i++;
+        }
+      }
+
+      if ( pass || (filespace != -1) ) {
+        if ( H5Sclose(filespace) < 0 ) {
+          pass = false;
+          failure_mssg = "H5Sclose(filespace) failed.\n";
+        }
+      }
+
+      /* free data_slice if it has been allocated */
+      if ( data_slice != NULL ) {
+        HDfree(data_slice);
+        data_slice = NULL;
+      }
+
+      /* 
+       * Read an H5S_ALL filespace into a hyperslab defined memory space 
+       */
+
+      if ( (data_slice = (float *)HDmalloc((size_t)(dset_size*2)*filetype_size)) == NULL ) {
+        pass = FALSE;
+        failure_mssg = "malloc of data_slice failed.\n";
+      }
+
+      /* setup memspace */
+      if ( pass ) {
+        dims[0] = (hsize_t)dset_size*2;
+        if ( (memspace = H5Screate_simple(1, dims, NULL)) < 0 ) {
+          pass = FALSE;
+          failure_mssg = "H5Screate_simple(1, dims, NULL) failed\n";
+        }
+      }
+      if ( pass ) {
+        offset = (hsize_t)dset_size;
+        if ( (H5Sselect_hyperslab(memspace, H5S_SELECT_SET,
+                                  &offset, NULL, &offset, NULL)) < 0 ) {
+          pass = FALSE;
+          failure_mssg = "H5Sselect_hyperslab() failed\n";
+        }
+      }
+
+#ifdef H5_HAVE_INSTRUMENTED_LIBRARY
+      if ( pass ) {
+        prop_value = H5D_XFER_COLL_RANK0_BCAST_DEF;
+        if(H5Pset(dxpl_id, H5D_XFER_COLL_RANK0_BCAST_NAME, &prop_value) < 0) {
+            pass = FALSE;
+            failure_mssg = "H5Pset() failed\n";
+        }
+      }
+#endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
+
+      /* read this processes section of the data */
+      if ( pass ) {
+        if ( (H5Dread(dset_id, H5T_NATIVE_FLOAT, memspace,
+                      H5S_ALL, dxpl_id, data_slice)) < 0 ) {
+          pass = FALSE;
+          failure_mssg = "H5Dread() failed\n";
+        }
+      }
+
+#ifdef H5_HAVE_INSTRUMENTED_LIBRARY
+      if ( pass ) {
+        prop_value = FALSE;
+        if(H5Pget(dxpl_id, H5D_XFER_COLL_RANK0_BCAST_NAME, &prop_value) < 0) {
+            pass = FALSE;
+            failure_mssg = "H5Pget() failed\n";
+        }
+        if (pass) {
+          if(prop_value != TRUE) {
+            pass = FALSE;
+            failure_mssg = "rank 0 Bcast optimization was mistakenly not performed\n";
+          }
+        }
+      }
+#endif /* H5_HAVE_INSTRUMENTED_LIBRARY */
+
+      /* verify the data */
+      if ( pass ) {
+
+        if ( comm == MPI_COMM_WORLD )       /* test 1 */
+          nextValue = 0;
+        else if ( group_id == 0 )           /* test 2 group 0 */
+          nextValue = 0;
+        else                                /* test 2 group 1 */
+          nextValue = (float)((hsize_t)(mpi_size / 2)*count);
+
+        i = (hsize_t)dset_size;
+        while ( ( pass ) && ( i < (hsize_t)dset_size ) ) {
+          /* what we really want is data_slice[i] != nextValue --
+           * the following is a circumlocution to shut up the
+           * the compiler.
+           */
+          if ( ( data_slice[i] > nextValue ) ||
+               ( data_slice[i] < nextValue ) ) {
+            pass = FALSE;
+            failure_mssg = "Unexpected dset contents.\n";
+          }
+          nextValue += 1;
+          i++;
+        }
+      }
+      
+      if ( pass || (memspace != -1) ) {
+        if ( H5Sclose(memspace) < 0 ) {
+          pass = false;
+          failure_mssg = "H5Sclose(memspace) failed.\n";
+        }
+      }
+      
+      /* free data_slice if it has been allocated */
+      if ( data_slice != NULL ) {
+        HDfree(data_slice);
+        data_slice = NULL;
+      }
+
+      if ( pass || (dxpl_id != -1) ) {
+        if ( H5Pclose(dxpl_id) < 0 ) {
+          pass = false;
+          failure_mssg = "H5Pclose(dxpl_id) failed.\n";
+        }
+      }
+    }
+
+    /* close file, etc. */
+    if ( pass || (dset_id != -1) ) {
+        if ( H5Dclose(dset_id) < 0 ) {
+            pass = false;
+            failure_mssg = "H5Dclose(dset_id) failed.\n";
+        }
+    }
+
+    if ( pass || (dset_id_ch != -1) ) {
+        if ( H5Dclose(dset_id_ch) < 0 ) {
+            pass = false;
+            failure_mssg = "H5Dclose(dset_id_ch) failed.\n";
+        }
+    }
+
     if ( pass || (file_id != -1) ) {
         if ( H5Fclose(file_id) < 0 ) {
             pass = false;
@@ -668,17 +1056,9 @@ test_parallel_read(MPI_Comm comm, int mpi_rank, int group_id)
             HDfprintf(stdout, "%s: failure_mssg = \"%s\"\n",
                       fcn_name, failure_mssg);
         }
-
         HDremove(reloc_data_filename);
     }
 
-    /* free data_slice if it has been allocated */
-    if ( data_slice != NULL ) {
-        HDfree(data_slice);
-        data_slice = NULL;
-    }
-
-
     return( ! pass );
 
 } /* test_parallel_read() */
@@ -803,7 +1183,7 @@ main( int argc, char **argv)
     }
 
     /* Now read the generated test file (stil using MPI_COMM_WORLD) */
-    nerrs += test_parallel_read( MPI_COMM_WORLD, mpi_rank, which_group);
+    nerrs += test_parallel_read( MPI_COMM_WORLD, mpi_rank, mpi_size, which_group);
 
     if ( nerrs > 0 ) {
         if ( mpi_rank == 0 ) {
@@ -819,7 +1199,7 @@ main( int argc, char **argv)
     }
 
     /* run the 2nd set of tests */
-    nerrs += test_parallel_read(group_comm, mpi_rank, which_group);
+    nerrs += test_parallel_read(group_comm, mpi_rank, mpi_size, which_group);
 
     if ( nerrs > 0 ) {
         if ( mpi_rank == 0 ) {
diff --git a/testpar/testpflush.sh.in b/testpar/testpflush.sh.in
new file mode 100644
index 0000000..02f0e26
--- /dev/null
+++ b/testpar/testpflush.sh.in
@@ -0,0 +1,64 @@
+#! /bin/sh
+#
+# Copyright by The HDF Group.
+# Copyright by the Board of Trustees of the University of Illinois.
+# All rights reserved.
+#
+# This file is part of HDF5.  The full HDF5 copyright notice, including
+# terms governing use, modification, and redistribution, is contained in
+# the COPYING file, which can be found at the root of the source code
+# distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.
+# If you do not have access to either file, you may request a copy from
+# help@hdfgroup.org.
+#
+#
+# Test script for the parallel flush test
+#
+# The parallel flush test uses two programs to test flush operations
+# in parallel HDF5. The first program purposely exits without calling
+# MPI_Finalize(), which is an error under the MPI standard and mpiexec
+# in some implementations will return an error code even though all
+# processes exit successfully. This script lets us swallow the error
+# from the first program.
+#
+# True errors in the first program will be detected as errors in the
+# second program, so watch out for that.
+#
+# Programmer:   Dana Robinson
+#               Fall 2018
+
+# The build (current) directory might be different than the source directory.
+if test -z "$srcdir"; then
+   srcdir=.
+fi
+
+# Turn the $$ we use to avoid Autotools munging into $
+#
+# Allowing $$ to substitute in both the RUNPARALLEL string and the
+# regexp is intentional. There doesn't seem to be a way around
+# this using quote shenanigans. The downside is that there is a remote
+# chance that the shell's pid will match a number in the RUNPARALLEL
+# variable, but that seems less likely to cause problems than expecting
+# library builders to specify two almost identical versions of the
+# RUNPARALLEL command, one for use in scripts and one via Makefiles.
+RUNPARALLELSCRIPT=`echo "@RUNPARALLEL@" | sed "s/$$/\$/g"`
+
+# ==========================================
+# Run the first parallel flush test program
+# (note that we ignore any errors here)
+# ==========================================
+echo "*** NOTE ***********************************************************"
+echo "You may see complaints from mpiexec et al. that not all processes"
+echo "called MPI_Finalize(). This is an intended characteristic of the"
+echo "test and should not be considered an  error."
+echo "********************************************************************"
+eval ${RUNPARALLELSCRIPT} ./t_pflush1
+
+
+# ===========================================
+# Run the second parallel flush test program
+# The return code of this call is the return
+# code of the script.
+# ===========================================
+eval ${RUNPARALLELSCRIPT} ./t_pflush2
+
diff --git a/tools/lib/h5tools_utils.c b/tools/lib/h5tools_utils.c
index 8ac0d32..e7e017f 100644
--- a/tools/lib/h5tools_utils.c
+++ b/tools/lib/h5tools_utils.c
@@ -561,6 +561,8 @@ herr_t
 init_objs(hid_t fid, find_objs_t *info, table_t **group_table,
     table_t **dset_table, table_t **type_table)
 {
+    herr_t ret_value = SUCCEED;
+
     /* Initialize the tables */
     init_table(group_table);
     init_table(dset_table);
@@ -573,7 +575,20 @@ init_objs(hid_t fid, find_objs_t *info, table_t **group_table,
     info->dset_table = *dset_table;
 
     /* Find all shared objects */
-    return(h5trav_visit(fid, "/", TRUE, TRUE, find_objs_cb, NULL, info, H5O_INFO_BASIC));
+    if((ret_value = h5trav_visit(fid, "/", TRUE, TRUE, find_objs_cb, NULL, info, H5O_INFO_BASIC)) < 0)
+        HGOTO_ERROR(FAIL, H5E_tools_min_id_g, "finding shared objects failed")
+
+done:
+    /* Release resources */
+    if(ret_value < 0) {
+        free_table(*group_table);
+        info->group_table = NULL;
+        free_table(*type_table);
+        info->type_table = NULL;
+        free_table(*dset_table);
+        info->dset_table = NULL;
+    }
+    return ret_value;
 }
 
 
diff --git a/tools/test/h5copy/CMakeTests.cmake b/tools/test/h5copy/CMakeTests.cmake
index 924ade1..f31068b 100644
--- a/tools/test/h5copy/CMakeTests.cmake
+++ b/tools/test/h5copy/CMakeTests.cmake
@@ -30,6 +30,7 @@
 
   set (LIST_OTHER_TEST_FILES
       ${HDF5_TOOLS_TEST_H5COPY_SOURCE_DIR}/testfiles/h5copy_misc1.out
+      ${HDF5_TOOLS_TEST_H5COPY_SOURCE_DIR}/testfiles/h5copy_misc1.err
       ${HDF5_TOOLS_TEST_H5COPY_SOURCE_DIR}/testfiles/tudfilter.h5.txt
       ${HDF5_TOOLS_TEST_H5COPY_SOURCE_DIR}/testfiles/tudfilter.h5_ERR.txt
       ${HDF5_TOOLS_TEST_H5COPY_SOURCE_DIR}/testfiles/h5copy_plugin_fail_ERR.out.h5.txt
@@ -250,6 +251,7 @@
               -D "TEST_OUTPUT=./testfiles/${testname}.out.out"
               -D "TEST_EXPECT=${resultcode}"
               -D "TEST_REFERENCE=./testfiles/${testname}.out"
+              -D "TEST_ERRREF=./testfiles/${testname}.err"
               -D "TEST_MASK=true"
               -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
       )
diff --git a/tools/test/h5copy/testfiles/h5copy_misc1.err b/tools/test/h5copy/testfiles/h5copy_misc1.err
new file mode 100644
index 0000000..2c2c867
--- /dev/null
+++ b/tools/test/h5copy/testfiles/h5copy_misc1.err
@@ -0,0 +1 @@
+h5copy error: group </g1> doesn't exist. Use -p to create parent groups.
diff --git a/tools/test/h5copy/testfiles/h5copy_misc1.out b/tools/test/h5copy/testfiles/h5copy_misc1.out
index 1624f2b..1c7181b 100644
--- a/tools/test/h5copy/testfiles/h5copy_misc1.out
+++ b/tools/test/h5copy/testfiles/h5copy_misc1.out
@@ -1,3 +1,2 @@
 Copying file <./testfiles/h5copytst.h5> and object </simple> to file <./testfiles/h5copy_misc1.out.h5> and object </g1/g2/simple>
 Error in copy...Exiting
-h5copy error: group </g1> doesn't exist. Use -p to create parent groups.
diff --git a/tools/test/h5copy/testh5copy.sh.in b/tools/test/h5copy/testh5copy.sh.in
index 203bfef..50758b5 100644
--- a/tools/test/h5copy/testh5copy.sh.in
+++ b/tools/test/h5copy/testh5copy.sh.in
@@ -60,6 +60,7 @@ $SRC_H5COPY_TESTFILES/h5copy_extlinks_trg.h5
 # List of expect files that will be copied over to local test dir
 LIST_OTHER_TEST_FILES="
 $SRC_H5COPY_TESTFILES/h5copy_misc1.out
+$SRC_H5COPY_TESTFILES/h5copy_misc1.err
 "
 
 H5COPY=../../src/h5copy/h5copy               # The tool name
@@ -396,6 +397,7 @@ CMP_OUTPUT()
 TOOLTEST_FAIL()
 {
     expectout="$TESTDIR/$1"
+    expecterr="$TESTDIR/`basename $1 .out`.err"
     actualout="$TESTDIR/$1.actualout"
     actualerr="$TESTDIR/$1.actualerr"
     actualout_sav=${actualout}-sav
@@ -426,10 +428,7 @@ TOOLTEST_FAIL()
         echo " PASSED"
         # Verifying output text from h5copy
         if [ "$expectout" != "SKIP" ]; then
-            # combine stderr to stdout to compare the output at once.
-            # We may seperate stdout and stderr later.
-            cat $actualerr >> $actualout
-            CMP_OUTPUT $expectout $actualout
+            CMP_OUTPUT $expecterr $actualerr
         fi
     else
         echo "*FAILED*"
diff --git a/tools/test/h5diff/CMakeTests.cmake b/tools/test/h5diff/CMakeTests.cmake
index e06f069..24646b0 100644
--- a/tools/test/h5diff/CMakeTests.cmake
+++ b/tools/test/h5diff/CMakeTests.cmake
@@ -168,21 +168,12 @@
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_452.txt
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_453.txt
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_454.txt
-      ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_454_ERR.txt
-      ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_454_ERR.err
+      ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/dangling_link.err
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_455.txt
-      ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_455_ERR.txt
-      ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_455_ERR.err
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_456.txt
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_457.txt
-      ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_457_ERR.txt
-      ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_457_ERR.err
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_458.txt
-      ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_458_ERR.txt
-      ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_458_ERR.err
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_459.txt
-      ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_459_ERR.txt
-      ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_459_ERR.err
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_465.txt
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_466.txt
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_467.txt
@@ -238,7 +229,6 @@
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_63.txt
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_600.txt
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_601.txt
-      ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_601_ERR.txt
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_601_ERR.err
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_603.txt
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_604.txt
@@ -293,6 +283,7 @@
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_8625.txt
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_8639.txt
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_ud.txt
+      ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_udfail.err
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_udfail.txt
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_v1.txt
       ${HDF5_TOOLS_TEST_H5DIFF_SOURCE_DIR}/testfiles/h5diff_v2.txt
@@ -400,47 +391,6 @@
     endif ()
   endmacro ()
 
-  macro (ADD_H5_ERR_TEST resultfile resultcode)
-    # If using memchecker add tests without using scripts
-    if (HDF5_ENABLE_USING_MEMCHECKER)
-      add_test (NAME H5DIFF_ERR-${resultfile} COMMAND $<TARGET_FILE:h5diff> --enable-error-stack ${ARGN})
-      set_tests_properties (H5DIFF_ERR-${resultfile} PROPERTIES WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/testfiles")
-      if (NOT "${resultcode}" STREQUAL "0")
-        set_tests_properties (H5DIFF_ERR-${resultfile} PROPERTIES WILL_FAIL "true")
-      endif ()
-      if (NOT "${last_test}" STREQUAL "")
-        set_tests_properties (H5DIFF_ERR-${resultfile} PROPERTIES DEPENDS ${last_test})
-      endif ()
-    else ()
-      # Remove any output file left over from previous test run
-      add_test (
-          NAME H5DIFF_ERR-${resultfile}-clear-objects
-          COMMAND    ${CMAKE_COMMAND}
-              -E remove
-              testfiles/${resultfile}_ERR.out
-              testfiles/${resultfile}_ERR.out.err
-      )
-      if (NOT "${last_test}" STREQUAL "")
-        set_tests_properties (H5DIFF_ERR-${resultfile}-clear-objects PROPERTIES DEPENDS ${last_test})
-      endif ()
-      add_test (
-          NAME H5DIFF_ERR-${resultfile}
-          COMMAND "${CMAKE_COMMAND}"
-              -D "TEST_PROGRAM=$<TARGET_FILE:h5diff>"
-              -D "TEST_ARGS:STRING=--enable-error-stack;${ARGN}"
-              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/testfiles"
-              -D "TEST_OUTPUT=${resultfile}_ERR.out"
-              -D "TEST_EXPECT=${resultcode}"
-              -D "TEST_REFERENCE=${resultfile}_ERR.txt"
-              -D "TEST_MASK_ERROR=true"
-              -D "TEST_APPEND=EXIT CODE:"
-              -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
-      )
-      set_tests_properties (H5DIFF_ERR-${resultfile} PROPERTIES DEPENDS H5DIFF_ERR-${resultfile}-clear-objects)
-    endif ()
-    set (last_test "H5DIFF_ERR-${resultfile}")
-  endmacro ()
-
   macro (ADD_PH5_TEST resultfile resultcode)
     # If using memchecker add tests without using scripts
     if (HDF5_ENABLE_USING_MEMCHECKER)
@@ -529,53 +479,6 @@
     endif ()
   endmacro ()
 
-  macro (ADD_H5_UD_ERR_TEST testname resultcode resultfile)
-    if (NOT HDF5_ENABLE_USING_MEMCHECKER)
-      # Remove any output file left over from previous test run
-      add_test (
-          NAME H5DIFF_UD_ERR-${testname}-clearall-objects
-          COMMAND    ${CMAKE_COMMAND}
-              -E remove
-              testfiles/${resultfile}_ERR.out
-              testfiles/${resultfile}_ERR.out.err
-      )
-      if ("${resultcode}" STREQUAL "2")
-        add_test (
-            NAME H5DIFF_UD_ERR-${testname}
-            COMMAND "${CMAKE_COMMAND}"
-                -D "TEST_PROGRAM=$<TARGET_FILE:h5diff-shared>"
-                -D "TEST_ARGS:STRING=--enable-error-stack;${ARGN}"
-                -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/testfiles"
-                -D "TEST_OUTPUT=${resultfile}_ERR.out"
-                -D "TEST_EXPECT=${resultcode}"
-                -D "TEST_REFERENCE=${resultfile}_ERR.txt"
-                -D "TEST_MASK_ERROR=true"
-                -D "TEST_APPEND=EXIT CODE:"
-                -D "TEST_ENV_VAR=HDF5_PLUGIN_PATH"
-                -D "TEST_ENV_VALUE=${CMAKE_BINARY_DIR}"
-                -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
-        )
-      else ()
-        add_test (
-            NAME H5DIFF_UD_ERR-${testname}
-            COMMAND "${CMAKE_COMMAND}"
-                -D "TEST_PROGRAM=$<TARGET_FILE:h5diff-shared>"
-                -D "TEST_ARGS:STRING=--enable-error-stack;${ARGN}"
-                -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/testfiles"
-                -D "TEST_OUTPUT=${resultfile}_ERR.out"
-                -D "TEST_EXPECT=${resultcode}"
-                -D "TEST_REFERENCE=${resultfile}_ERR.txt"
-                -D "TEST_MASK_ERROR=true"
-                -D "TEST_APPEND=EXIT CODE:"
-                -D "TEST_ENV_VAR=HDF5_PLUGIN_PATH"
-                -D "TEST_ENV_VALUE=${CMAKE_BINARY_DIR}/plugins"
-                -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
-        )
-      endif ()
-      set_tests_properties (H5DIFF_UD_ERR-${testname} PROPERTIES DEPENDS H5DIFF_UD_ERR-${testname}-clearall-objects)
-    endif ()
-  endmacro ()
-
 ##############################################################################
 ##############################################################################
 ###           T H E   T E S T S                                            ###
@@ -798,26 +701,16 @@
           h5diff_453.out.err
           h5diff_454.out
           h5diff_454.out.err
-          h5diff_454_ERR.out
-          h5diff_454_ERR.out.err
           h5diff_455.out
           h5diff_455.out.err
-          h5diff_455_ERR.out
-          h5diff_455_ERR.out.err
           h5diff_456.out
           h5diff_456.out.err
           h5diff_457.out
           h5diff_457.out.err
-          h5diff_457_ERR.out
-          h5diff_457_ERR.out.err
           h5diff_458.out
           h5diff_458.out.err
-          h5diff_458_ERR.out
-          h5diff_458_ERR.out.err
           h5diff_459.out
           h5diff_459.out.err
-          h5diff_459_ERR.out
-          h5diff_459_ERR.out.err
           h5diff_465.out
           h5diff_465.out.err
           h5diff_466.out
@@ -922,8 +815,6 @@
           h5diff_600.out.err
           h5diff_601.out
           h5diff_601.out.err
-          h5diff_601_ERR.out
-          h5diff_601_ERR.out.err
           h5diff_603.out
           h5diff_603.out.err
           h5diff_604.out
@@ -1181,7 +1072,6 @@ ADD_H5_TEST (h5diff_600 1 ${FILE1})
 
 # 6.1: Check if non-exist object name is specified
 ADD_H5_TEST (h5diff_601 2 ${FILE1} ${FILE1} nono_obj)
-ADD_H5_ERR_TEST (h5diff_601 2 ${FILE1} ${FILE1} nono_obj)
 
 # ##############################################################################
 # # -d
@@ -1481,26 +1371,21 @@ ADD_H5_TEST (h5diff_453 2  --follow-symlinks -v --no-dangling-links  ${FILE13} $
 
 # dangling link found for soft links (obj to obj)
 ADD_H5_TEST (h5diff_454 2  --follow-symlinks -v --no-dangling-links  ${FILE13} ${FILE13} /softlink_dset2 /softlink_noexist)
-ADD_H5_ERR_TEST (h5diff_454 2  --follow-symlinks -v --no-dangling-links  ${FILE13} ${FILE13} /softlink_dset2 /softlink_noexist)
 
 # dangling link found for soft links (obj to obj) Both dangle links
 ADD_H5_TEST (h5diff_455 2  --follow-symlinks -v --no-dangling-links  ${FILE13} ${FILE13} /softlink_noexist /softlink_noexist)
-ADD_H5_ERR_TEST (h5diff_455 2  --follow-symlinks -v --no-dangling-links  ${FILE13} ${FILE13} /softlink_noexist /softlink_noexist)
 
 # dangling link found for ext links (FILE to FILE)
 ADD_H5_TEST (h5diff_456 2  --follow-symlinks -v --no-dangling-links  ${FILE15} ${FILE15})
 
 # dangling link found for ext links (obj to obj). target file exist
 ADD_H5_TEST (h5diff_457 2  --follow-symlinks -v --no-dangling-links  ${FILE15} ${FILE15} /ext_link_dset1 /ext_link_noexist1)
-ADD_H5_ERR_TEST (h5diff_457 2  --follow-symlinks -v --no-dangling-links  ${FILE15} ${FILE15} /ext_link_dset1 /ext_link_noexist1)
 
 # dangling link found for ext links (obj to obj). target file NOT exist
 ADD_H5_TEST (h5diff_458 2  --follow-symlinks -v --no-dangling-links  ${FILE15} ${FILE15} /ext_link_dset1 /ext_link_noexist2)
-ADD_H5_ERR_TEST (h5diff_458 2  --follow-symlinks -v --no-dangling-links  ${FILE15} ${FILE15} /ext_link_dset1 /ext_link_noexist2)
 
 # dangling link found for ext links (obj to obj). Both dangle links
 ADD_H5_TEST (h5diff_459 2  --follow-symlinks -v --no-dangling-links  ${FILE15} ${FILE15} /ext_link_noexist1 /ext_link_noexist2)
-ADD_H5_ERR_TEST (h5diff_459 2  --follow-symlinks -v --no-dangling-links  ${FILE15} ${FILE15} /ext_link_noexist1 /ext_link_noexist2)
 
 # dangling link --follow-symlinks (obj vs obj)
 # (HDFFV-7836)
diff --git a/tools/test/h5diff/h5diff_plugin.sh.in b/tools/test/h5diff/h5diff_plugin.sh.in
index 212f5d6..341cba5 100644
--- a/tools/test/h5diff/h5diff_plugin.sh.in
+++ b/tools/test/h5diff/h5diff_plugin.sh.in
@@ -62,6 +62,7 @@ LIST_HDF5_TEST_FILES="
 $SRC_H5DIFF_TESTFILES/tudfilter.h5
 $SRC_H5DIFF_TESTFILES/tudfilter2.h5
 $SRC_H5DIFF_TESTFILES/h5diff_ud.txt
+$SRC_H5DIFF_TESTFILES/h5diff_udfail.err
 $SRC_H5DIFF_TESTFILES/h5diff_udfail.txt
 "
 
@@ -204,7 +205,7 @@ VERIFY() {
 TOOLTEST() {
     expect="$TESTDIR/$1"
     actual="$TESTDIR/`basename $1 .txt`.out"
-    actual_err="$TESTDIR/`basename $1 .txt`.err"
+    actual_err="$TESTDIR/`basename $1 .txt`.out.err"
     actual_sav=${actual}-sav
     actual_err_sav=${actual_err}-sav
     shift
@@ -287,6 +288,90 @@ TOOLTEST() {
       rm -f $actual_sorted $expect_sorted
     fi
 }
+# Same as TOOLSET except only err file checked
+TOOLTEST_ERR() {
+    expect="$TESTDIR/$1"
+    expect_err="$TESTDIR/`basename $1 .txt`.err"
+    actual="$TESTDIR/`basename $1 .txt`.out"
+    actual_err="$TESTDIR/`basename $1 .txt`.out.err"
+    actual_sav=${actual}-sav
+    actual_err_sav=${actual_err}-sav
+    shift
+    if test -n "$pmode"; then
+        RUNCMD=$RUNPARALLEL
+    else
+        RUNCMD=$RUNSERIAL
+    fi
+
+    # Run test.
+    TESTING $H5DIFF $@
+    (
+    #echo "#############################"
+    #echo "Expected output for '$H5DIFF $@'"
+    #echo "#############################"
+    cd $TESTDIR
+    eval $ENVCMD $RUNCMD $H5DIFF_BIN "$@"
+    ) >$actual 2>$actual_err
+    EXIT_CODE=$?
+    # save actual and actual_err in case they are needed later.
+    cp $actual $actual_sav
+    STDOUT_FILTER $actual
+    cp $actual_err $actual_err_sav
+    STDERR_FILTER $actual_err
+    # don't add exit code check in pmode, as it causes failure. (exit code
+    # is from mpirun not tool)
+    # if any problem occurs relate to an exit code, it will be caught in
+    # serial mode, so the test is fullfilled.
+    if test $h5haveexitcode = 'yes' -a -z "$pmode"; then
+      echo "EXIT CODE: $EXIT_CODE" >> $actual
+    fi
+
+    if [ ! -f $expect ]; then
+        # Create the expect file if it doesn't yet exist.
+        echo " CREATED"
+        cp $actual $expect
+        echo "    Expected result (*.ddl) missing"
+        nerrors="`expr $nerrors + 1`"
+    elif $CMP $expect_err $actual_err; then
+        echo " PASSED"
+    elif test $h5haveexitcode = 'yes' -a -z "$pmode"; then
+        echo "*FAILED*"
+        echo "    Expected result ($expect_err) differs from actual result ($actual_err)"
+        nerrors="`expr $nerrors + 1`"
+        test yes = "$verbose" && $DIFF $expect_err $actual_err |sed 's/^/    /'
+    else
+        # parallel mode output are often of different ordering from serial
+        # output.  If the sorted expect_err and actual_err files compare the same,
+        # it is safe to assume the actual output match the expected file.
+        expect_sorted=expect_sorted
+        actual_sorted=actual_sorted
+        sort $expect_err -o $expect_sorted
+        sort $actual_err -o $actual_sorted
+        mv $expect_sorted.noexit $expect_sorted
+    if $CMP $expect_sorted $actual_sorted; then
+        echo " PASSED"
+    else
+        echo "*FAILED*"
+        nerrors="`expr $nerrors + 1`"
+        if test yes = "$verbose"; then
+        echo "====Expected result ($expect_sorted) differs from actual result ($actual_sorted)"
+        $DIFF $expect_sorted $actual_sorted |sed 's/^/    /'
+        echo "====The actual output ($actual_sav)"
+        sed 's/^/    /' < $actual_sav
+        echo "====The actual stderr ($actual_err_sav)"
+        sed 's/^/    /' < $actual_err_sav
+        echo "====End of actual stderr ($actual_err_sav)"
+        echo ""
+        fi
+    fi
+    fi
+
+    # Clean up output file
+    if test -z "$HDF5_NOCLEANUP"; then
+      rm -f $actual $actual_err $actual_sav $actual_err_sav
+      rm -f $actual_sorted $expect_sorted
+    fi
+}
 
 ##############################################################################
 ###           T H E   T E S T S
diff --git a/tools/test/h5diff/testfiles/h5diff_459_ERR.err b/tools/test/h5diff/testfiles/dangling_link.err
index 82802a1..82802a1 100644
--- a/tools/test/h5diff/testfiles/h5diff_459_ERR.err
+++ b/tools/test/h5diff/testfiles/dangling_link.err
diff --git a/tools/test/h5diff/testfiles/h5diff_454_ERR.err b/tools/test/h5diff/testfiles/h5diff_454_ERR.err
deleted file mode 100644
index 82802a1..0000000
--- a/tools/test/h5diff/testfiles/h5diff_454_ERR.err
+++ /dev/null
@@ -1,4 +0,0 @@
-H5tools-DIAG: Error detected in HDF5:tools (version (number)) thread (IDs):
-  #000: (file name) line (number) in h5diff(): treat dangling link as error
-    major: Failure in tools library
-    minor: error in function
diff --git a/tools/test/h5diff/testfiles/h5diff_454_ERR.txt b/tools/test/h5diff/testfiles/h5diff_454_ERR.txt
deleted file mode 100644
index 4501071..0000000
--- a/tools/test/h5diff/testfiles/h5diff_454_ERR.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-Warning: </softlink_noexist> is a dangling link.
-H5tools-DIAG: Error detected in HDF5:tools (version (number)) thread (IDs):
-  #000: (file name) line (number) in h5diff(): treat dangling link as error
-    major: Failure in tools library
-    minor: error in function
-EXIT CODE: 2
diff --git a/tools/test/h5diff/testfiles/h5diff_455_ERR.err b/tools/test/h5diff/testfiles/h5diff_455_ERR.err
deleted file mode 100644
index 82802a1..0000000
--- a/tools/test/h5diff/testfiles/h5diff_455_ERR.err
+++ /dev/null
@@ -1,4 +0,0 @@
-H5tools-DIAG: Error detected in HDF5:tools (version (number)) thread (IDs):
-  #000: (file name) line (number) in h5diff(): treat dangling link as error
-    major: Failure in tools library
-    minor: error in function
diff --git a/tools/test/h5diff/testfiles/h5diff_455_ERR.txt b/tools/test/h5diff/testfiles/h5diff_455_ERR.txt
deleted file mode 100644
index 4501071..0000000
--- a/tools/test/h5diff/testfiles/h5diff_455_ERR.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-Warning: </softlink_noexist> is a dangling link.
-H5tools-DIAG: Error detected in HDF5:tools (version (number)) thread (IDs):
-  #000: (file name) line (number) in h5diff(): treat dangling link as error
-    major: Failure in tools library
-    minor: error in function
-EXIT CODE: 2
diff --git a/tools/test/h5diff/testfiles/h5diff_457_ERR.err b/tools/test/h5diff/testfiles/h5diff_457_ERR.err
deleted file mode 100644
index 82802a1..0000000
--- a/tools/test/h5diff/testfiles/h5diff_457_ERR.err
+++ /dev/null
@@ -1,4 +0,0 @@
-H5tools-DIAG: Error detected in HDF5:tools (version (number)) thread (IDs):
-  #000: (file name) line (number) in h5diff(): treat dangling link as error
-    major: Failure in tools library
-    minor: error in function
diff --git a/tools/test/h5diff/testfiles/h5diff_457_ERR.txt b/tools/test/h5diff/testfiles/h5diff_457_ERR.txt
deleted file mode 100644
index 9d73750..0000000
--- a/tools/test/h5diff/testfiles/h5diff_457_ERR.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-Warning: </ext_link_noexist1> is a dangling link.
-H5tools-DIAG: Error detected in HDF5:tools (version (number)) thread (IDs):
-  #000: (file name) line (number) in h5diff(): treat dangling link as error
-    major: Failure in tools library
-    minor: error in function
-EXIT CODE: 2
diff --git a/tools/test/h5diff/testfiles/h5diff_458_ERR.err b/tools/test/h5diff/testfiles/h5diff_458_ERR.err
deleted file mode 100644
index 82802a1..0000000
--- a/tools/test/h5diff/testfiles/h5diff_458_ERR.err
+++ /dev/null
@@ -1,4 +0,0 @@
-H5tools-DIAG: Error detected in HDF5:tools (version (number)) thread (IDs):
-  #000: (file name) line (number) in h5diff(): treat dangling link as error
-    major: Failure in tools library
-    minor: error in function
diff --git a/tools/test/h5diff/testfiles/h5diff_458_ERR.txt b/tools/test/h5diff/testfiles/h5diff_458_ERR.txt
deleted file mode 100644
index b084914..0000000
--- a/tools/test/h5diff/testfiles/h5diff_458_ERR.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-Warning: </ext_link_noexist2> is a dangling link.
-H5tools-DIAG: Error detected in HDF5:tools (version (number)) thread (IDs):
-  #000: (file name) line (number) in h5diff(): treat dangling link as error
-    major: Failure in tools library
-    minor: error in function
-EXIT CODE: 2
diff --git a/tools/test/h5diff/testfiles/h5diff_459_ERR.txt b/tools/test/h5diff/testfiles/h5diff_459_ERR.txt
deleted file mode 100644
index 9d73750..0000000
--- a/tools/test/h5diff/testfiles/h5diff_459_ERR.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-Warning: </ext_link_noexist1> is a dangling link.
-H5tools-DIAG: Error detected in HDF5:tools (version (number)) thread (IDs):
-  #000: (file name) line (number) in h5diff(): treat dangling link as error
-    major: Failure in tools library
-    minor: error in function
-EXIT CODE: 2
diff --git a/tools/test/h5diff/testfiles/h5diff_600.txt b/tools/test/h5diff/testfiles/h5diff_600.txt
index f3b346a..13d627c 100644
--- a/tools/test/h5diff/testfiles/h5diff_600.txt
+++ b/tools/test/h5diff/testfiles/h5diff_600.txt
@@ -142,5 +142,4 @@ usage: h5diff [OPTIONS] file1 file2 [obj1[ obj2]]
   Use h5diff file1 file1 /g1/dset1 /g1/dset2 to compare
   '/g1/dset1' and '/g1/dset2' in the same file
 
-h5diff error: missing file names
 EXIT CODE: 1
diff --git a/tools/test/h5diff/testfiles/h5diff_601_ERR.txt b/tools/test/h5diff/testfiles/h5diff_601_ERR.txt
deleted file mode 100644
index b58124a..0000000
--- a/tools/test/h5diff/testfiles/h5diff_601_ERR.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-Object </nono_obj> could not be found in <h5diff_basic1.h5>
-H5tools-DIAG: Error detected in HDF5:tools (version (number)) thread (IDs):
-  #000: (file name) line (number) in h5diff(): Error: Object could not be found
-    major: Failure in tools library
-    minor: error in function
-EXIT CODE: 2
diff --git a/tools/test/h5diff/testfiles/h5diff_udfail.err b/tools/test/h5diff/testfiles/h5diff_udfail.err
new file mode 100644
index 0000000..d51de38
--- /dev/null
+++ b/tools/test/h5diff/testfiles/h5diff_udfail.err
@@ -0,0 +1,12 @@
+
+file1     file2
+---------------------------------------
+    x      x    /              
+    x      x    /dynlibud      
+
+group  : </> and </>
+0 differences found
+dataset: </dynlibud> and </dynlibud>
+0 differences found
+Warning: dataset </dynlibud> cannot be read, user defined filter is not available
+EXIT CODE: 2
diff --git a/tools/test/h5diff/testfiles/h5diff_udfail.txt b/tools/test/h5diff/testfiles/h5diff_udfail.txt
index d51de38..e6000fc 100644
--- a/tools/test/h5diff/testfiles/h5diff_udfail.txt
+++ b/tools/test/h5diff/testfiles/h5diff_udfail.txt
@@ -8,5 +8,4 @@ group  : </> and </>
 0 differences found
 dataset: </dynlibud> and </dynlibud>
 0 differences found
-Warning: dataset </dynlibud> cannot be read, user defined filter is not available
 EXIT CODE: 2
diff --git a/tools/test/h5diff/testh5diff.sh.in b/tools/test/h5diff/testh5diff.sh.in
index c464f94..557d2ff 100644
--- a/tools/test/h5diff/testh5diff.sh.in
+++ b/tools/test/h5diff/testh5diff.sh.in
@@ -226,6 +226,7 @@ $SRC_H5DIFF_TESTFILES/h5diff_451.txt
 $SRC_H5DIFF_TESTFILES/h5diff_452.txt
 $SRC_H5DIFF_TESTFILES/h5diff_453.txt
 $SRC_H5DIFF_TESTFILES/h5diff_454.txt
+$SRC_H5DIFF_TESTFILES/dangling_link.err
 $SRC_H5DIFF_TESTFILES/h5diff_455.txt
 $SRC_H5DIFF_TESTFILES/h5diff_456.txt
 $SRC_H5DIFF_TESTFILES/h5diff_457.txt
@@ -286,6 +287,7 @@ $SRC_H5DIFF_TESTFILES/h5diff_62.txt
 $SRC_H5DIFF_TESTFILES/h5diff_63.txt
 $SRC_H5DIFF_TESTFILES/h5diff_600.txt
 $SRC_H5DIFF_TESTFILES/h5diff_601.txt
+$SRC_H5DIFF_TESTFILES/h5diff_601_ERR.err
 $SRC_H5DIFF_TESTFILES/h5diff_603.txt
 $SRC_H5DIFF_TESTFILES/h5diff_604.txt
 $SRC_H5DIFF_TESTFILES/h5diff_605.txt
@@ -462,8 +464,9 @@ TESTING() {
 #
 TOOLTEST() {
     expect="$TESTDIR/$1"
+    expect_err="$TESTDIR/`basename $1 .txt`.err"
     actual="$TESTDIR/`basename $1 .txt`.out"
-    actual_err="$TESTDIR/`basename $1 .txt`.err"
+    actual_err="$TESTDIR/`basename $1 .txt`.out.err"
     actual_sav=${actual}-sav
     actual_err_sav=${actual_err}-sav
     shift
@@ -488,7 +491,6 @@ TOOLTEST() {
     STDOUT_FILTER $actual
     cp $actual_err $actual_err_sav
     STDERR_FILTER $actual_err
-    cat $actual_err >> $actual
     # don't add exit code check in pmode, as it causes failure. (exit code
     # is from mpirun not tool)
     # if any problem occurs relate to an exit code, it will be caught in
diff --git a/tools/test/h5dump/errfiles/tall-1.err b/tools/test/h5dump/errfiles/tall-1.err
index 2d2b289..84140f2 100644
--- a/tools/test/h5dump/errfiles/tall-1.err
+++ b/tools/test/h5dump/errfiles/tall-1.err
@@ -32,6 +32,3 @@ HDF5-DIAG: Error detected in HDF5 (version (number)) thread (IDs):
   #010: (file name) line (number) in H5L__extern_traverse(): unable to open external file, external link file name = 'somefile'
     major: Links
     minor: Unable to open file
-  #011: (file name) line (number) in H5F_prefix_open_file(): unable to open file, file name = 'somefile', temp_file_name = 'somefile'
-    major: File accessibility
-    minor: Unable to open file
diff --git a/tools/test/h5dump/errfiles/tall-2A.err b/tools/test/h5dump/errfiles/tall-2A.err
index 2d2b289..84140f2 100644
--- a/tools/test/h5dump/errfiles/tall-2A.err
+++ b/tools/test/h5dump/errfiles/tall-2A.err
@@ -32,6 +32,3 @@ HDF5-DIAG: Error detected in HDF5 (version (number)) thread (IDs):
   #010: (file name) line (number) in H5L__extern_traverse(): unable to open external file, external link file name = 'somefile'
     major: Links
     minor: Unable to open file
-  #011: (file name) line (number) in H5F_prefix_open_file(): unable to open file, file name = 'somefile', temp_file_name = 'somefile'
-    major: File accessibility
-    minor: Unable to open file
diff --git a/tools/test/h5dump/errfiles/tall-2A0.err b/tools/test/h5dump/errfiles/tall-2A0.err
index 2d2b289..84140f2 100644
--- a/tools/test/h5dump/errfiles/tall-2A0.err
+++ b/tools/test/h5dump/errfiles/tall-2A0.err
@@ -32,6 +32,3 @@ HDF5-DIAG: Error detected in HDF5 (version (number)) thread (IDs):
   #010: (file name) line (number) in H5L__extern_traverse(): unable to open external file, external link file name = 'somefile'
     major: Links
     minor: Unable to open file
-  #011: (file name) line (number) in H5F_prefix_open_file(): unable to open file, file name = 'somefile', temp_file_name = 'somefile'
-    major: File accessibility
-    minor: Unable to open file
diff --git a/tools/test/h5dump/errfiles/tall-2B.err b/tools/test/h5dump/errfiles/tall-2B.err
index 2d2b289..84140f2 100644
--- a/tools/test/h5dump/errfiles/tall-2B.err
+++ b/tools/test/h5dump/errfiles/tall-2B.err
@@ -32,6 +32,3 @@ HDF5-DIAG: Error detected in HDF5 (version (number)) thread (IDs):
   #010: (file name) line (number) in H5L__extern_traverse(): unable to open external file, external link file name = 'somefile'
     major: Links
     minor: Unable to open file
-  #011: (file name) line (number) in H5F_prefix_open_file(): unable to open file, file name = 'somefile', temp_file_name = 'somefile'
-    major: File accessibility
-    minor: Unable to open file
diff --git a/tools/test/h5dump/errfiles/textlink.err b/tools/test/h5dump/errfiles/textlink.err
index aaf3144..3f77f38 100644
--- a/tools/test/h5dump/errfiles/textlink.err
+++ b/tools/test/h5dump/errfiles/textlink.err
@@ -32,9 +32,6 @@ HDF5-DIAG: Error detected in HDF5 (version (number)) thread (IDs):
   #010: (file name) line (number) in H5L__extern_traverse(): unable to open external file, external link file name = 'filename'
     major: Links
     minor: Unable to open file
-  #011: (file name) line (number) in H5F_prefix_open_file(): unable to open file, file name = 'filename', temp_file_name = 'filename'
-    major: File accessibility
-    minor: Unable to open file
 HDF5-DIAG: Error detected in HDF5 (version (number)) thread (IDs):
   #000: (file name) line (number) in H5Oopen(): unable to open object
     major: Object header
@@ -69,6 +66,3 @@ HDF5-DIAG: Error detected in HDF5 (version (number)) thread (IDs):
   #010: (file name) line (number) in H5L__extern_traverse(): unable to open external file, external link file name = 'anotherfile'
     major: Links
     minor: Unable to open file
-  #011: (file name) line (number) in H5F_prefix_open_file(): unable to open file, file name = 'anotherfile', temp_file_name = 'anotherfile'
-    major: File accessibility
-    minor: Unable to open file
diff --git a/tools/test/h5dump/errfiles/torderlinks1.err b/tools/test/h5dump/errfiles/torderlinks1.err
index ce31ced..caeef27 100644
--- a/tools/test/h5dump/errfiles/torderlinks1.err
+++ b/tools/test/h5dump/errfiles/torderlinks1.err
@@ -32,6 +32,3 @@ HDF5-DIAG: Error detected in HDF5 (version (number)) thread (IDs):
   #010: (file name) line (number) in H5L__extern_traverse(): unable to open external file, external link file name = 'fname'
     major: Links
     minor: Unable to open file
-  #011: (file name) line (number) in H5F_prefix_open_file(): unable to open file, file name = 'fname', temp_file_name = 'fname'
-    major: File accessibility
-    minor: Unable to open file
diff --git a/tools/test/h5dump/errfiles/torderlinks2.err b/tools/test/h5dump/errfiles/torderlinks2.err
index ce31ced..caeef27 100644
--- a/tools/test/h5dump/errfiles/torderlinks2.err
+++ b/tools/test/h5dump/errfiles/torderlinks2.err
@@ -32,6 +32,3 @@ HDF5-DIAG: Error detected in HDF5 (version (number)) thread (IDs):
   #010: (file name) line (number) in H5L__extern_traverse(): unable to open external file, external link file name = 'fname'
     major: Links
     minor: Unable to open file
-  #011: (file name) line (number) in H5F_prefix_open_file(): unable to open file, file name = 'fname', temp_file_name = 'fname'
-    major: File accessibility
-    minor: Unable to open file
diff --git a/tools/test/h5dump/testh5dump.sh.in b/tools/test/h5dump/testh5dump.sh.in
index 42e4b07..af5d547 100644
--- a/tools/test/h5dump/testh5dump.sh.in
+++ b/tools/test/h5dump/testh5dump.sh.in
@@ -490,7 +490,6 @@ TOOLTEST() {
     STDOUT_FILTER $actual
     cp $actual_err $actual_err_sav
     STDERR_FILTER $actual_err
-    cat $actual_err >> $actual
 
   if [ ! -f $expect ]; then
     # Create the expect file if it doesn't yet exist.
@@ -534,7 +533,6 @@ TOOLTEST2() {
       cd $TESTDIR
       $RUNSERIAL $DUMPER_BIN "$@"
     ) >$actual 2>$actual_err
-    cat $actual_err >> $actual
 
     if [ ! -f $expect ]; then
     # Create the expect file if it doesn't yet exist.
@@ -593,7 +591,6 @@ TOOLTEST2A() {
       cd $TESTDIR
       $RUNSERIAL $DUMPER_BIN "$@"
     ) >$actual 2>$actual_err
-    cat $actual_err >> $actual
 
     if [ ! -f $expect ]; then
     # Create the expect file if it doesn't yet exist.
@@ -660,7 +657,6 @@ TOOLTEST2B() {
       cd $TESTDIR
       $RUNSERIAL $DUMPER_BIN "$@"
     ) >$actual 2>$actual_err
-    cat $actual_err >> $actual
 
     if [ ! -f $expectdata ]; then
     # Create the expect data file if it doesn't yet exist.
@@ -717,7 +713,6 @@ TOOLTEST3() {
         -e 's/H5Eget_auto[1-2]*/H5Eget_auto(1 or 2)/' \
         -e 's/H5Eset_auto[1-2]*/H5Eset_auto(1 or 2)/' \
      $actual_err > $actual_ext
-    cat $actual_ext >> $actual
 
     if [ ! -f $expect ]; then
     # Create the expect file if it doesn't yet exist.
@@ -776,7 +771,6 @@ TOOLTEST4() {
         -e 's/H5Eget_auto[1-2]*/H5Eget_auto(1 or 2)/' \
         -e 's/H5Eset_auto[1-2]*/H5Eset_auto(1 or 2)/' \
      $actual_err > $actual_ext
-    #cat $actual_ext >> $actual
 
     if [ ! -f $expect ]; then
     # Create the expect file if it doesn't yet exist.
@@ -842,7 +836,6 @@ TOOLTEST5() {
         -e 's/H5Eget_auto[1-2]*/H5Eget_auto(1 or 2)/' \
         -e 's/H5Eset_auto[1-2]*/H5Eset_auto(1 or 2)/' \
      $actual_err > $actual_ext
-    #cat $actual_ext >> $actual
 
     if [ ! -f $expect ]; then
     # Create the expect file if it doesn't yet exist.
@@ -886,7 +879,6 @@ TOOLTEST_HELP() {
       cd $TESTDIR
       $RUNSERIAL $DUMPER_BIN "$@"
     ) >$actual 2>$actual_err
-    cat $actual_err >> $actual
 
     if [ ! -f $expectdata ]; then
     # Create the expect data file if it doesn't yet exist.
diff --git a/tools/test/h5dump/testh5dumppbits.sh.in b/tools/test/h5dump/testh5dumppbits.sh.in
index 9cf5c99..febce2c 100644
--- a/tools/test/h5dump/testh5dumppbits.sh.in
+++ b/tools/test/h5dump/testh5dumppbits.sh.in
@@ -235,7 +235,6 @@ TOOLTEST() {
     STDOUT_FILTER $actual
     cp $actual_err $actual_err_sav
     STDERR_FILTER $actual_err
-    cat $actual_err >> $actual
 
   if [ ! -f $expect ]; then
     # Create the expect file if it doesn't yet exist.
@@ -278,7 +277,6 @@ TOOLTEST2() {
       cd $TESTDIR
       $RUNSERIAL $DUMPER_BIN "$@"
     ) >$actual 2>$actual_err
-    cat $actual_err >> $actual
 
     if [ ! -f $expect ]; then
     # Create the expect file if it doesn't yet exist.
@@ -348,7 +346,6 @@ TOOLTEST3() {
         -e 's/H5Eget_auto[1-2]*/H5Eget_auto(1 or 2)/' \
         -e 's/H5Eset_auto[1-2]*/H5Eset_auto(1 or 2)/' \
      $actual_err > $actual_ext
-    cat $actual_ext >> $actual
 
     if [ ! -f $expect ]; then
     # Create the expect file if it doesn't yet exist.
@@ -406,7 +403,6 @@ TOOLTEST4() {
         -e 's/H5Eget_auto[1-2]*/H5Eget_auto(1 or 2)/' \
         -e 's/H5Eset_auto[1-2]*/H5Eset_auto(1 or 2)/' \
      $actual_err > $actual_ext
-    #cat $actual_ext >> $actual
 
     if [ ! -f $expect ]; then
     # Create the expect file if it doesn't yet exist.
diff --git a/tools/test/h5format_convert/CMakeTests.cmake b/tools/test/h5format_convert/CMakeTests.cmake
index 2240813..5792d40 100644
--- a/tools/test/h5format_convert/CMakeTests.cmake
+++ b/tools/test/h5format_convert/CMakeTests.cmake
@@ -22,10 +22,8 @@
   set (HDF5_REFERENCE_FILES
       h5fc_help.ddl
       h5fc_nooption.ddl
-      h5fc_nonexistfile.ddl
       h5fc_d_file.ddl
       h5fc_dname.ddl
-      h5fc_nonexistdset_file.ddl
       h5fc_v_non_chunked.ddl
       h5fc_v_bt1.ddl
       h5fc_v_ndata_bt1.ddl
@@ -49,6 +47,12 @@
       h5fc_v_err.ddl
       h5fc_v_err.ddl.err
   )
+  set (HDF5_REFERENCE_ERR_FILES
+      h5fc_d_file.ddl.err
+      h5fc_dname.err
+      h5fc_nonexistfile.ddl.err
+      h5fc_nonexistdset_file.ddl.err
+  )
   set (HDF5_REFERENCE_TEST_FILES
       h5fc_non_v3.h5
       h5fc_edge_v3.h5
@@ -78,6 +82,10 @@
     HDFTEST_COPY_FILE("${HDF5_TOOLS_TEST_H5FC_SOURCE_DIR}/testfiles/${ddl_file}" "${PROJECT_BINARY_DIR}/testfiles/${ddl_file}" "h5fc_files")
   endforeach ()
 
+  foreach (h5_file ${HDF5_REFERENCE_ERR_FILES})
+    HDFTEST_COPY_FILE("${HDF5_TOOLS_TEST_H5FC_SOURCE_DIR}/testfiles/${h5_file}" "${PROJECT_BINARY_DIR}/testfiles/${h5_file}" "h5fc_files")
+  endforeach ()
+
   foreach (h5_file ${HDF5_REFERENCE_TEST_FILES})
     HDFTEST_COPY_FILE("${HDF5_TOOLS_TEST_H5FC_SOURCE_DIR}/testfiles/${h5_file}" "${PROJECT_BINARY_DIR}/testfiles/${h5_file}" "h5fc_files")
   endforeach ()
@@ -119,6 +127,7 @@
                   -D "TEST_OUTPUT=${testname}.out"
                   -D "TEST_EXPECT=${resultcode}"
                   -D "TEST_REFERENCE=${resultfile}"
+                  -D "TEST_ERRREF=${resultfile}.err"
                   -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
           )
           set_tests_properties (H5FC-${testname}-${testfile} PROPERTIES DEPENDS "H5FC-${testname}-${testfile}-tmpfile")
@@ -141,6 +150,42 @@
     endif ()
   endmacro ()
 
+  macro (ADD_H5_NOERR_OUTPUT testname resultfile resultcode testfile)
+    # If using memchecker add tests without using scripts
+    if (NOT HDF5_ENABLE_USING_MEMCHECKER)
+      add_test (
+          NAME H5FC-${testname}-clear-objects
+          COMMAND    ${CMAKE_COMMAND}
+              -E remove
+              ./testfiles/outtmp.h5
+              ./testfiles/${testname}.out
+              ./testfiles/${testname}.out.err
+      )
+      if (NOT "${last_test}" STREQUAL "")
+        set_tests_properties (H5FC-${testname}-clear-objects PROPERTIES DEPENDS ${last_test})
+      endif ()
+      add_test (
+          NAME H5FC-${testname}-${testfile}-tmpfile
+          COMMAND    ${CMAKE_COMMAND}
+              -E copy_if_different ${HDF5_TOOLS_TEST_H5FC_SOURCE_DIR}/testfiles/${testfile} ./testfiles/outtmp.h5
+      )
+      set_tests_properties (H5FC-${testname}-${testfile}-tmpfile PROPERTIES DEPENDS "H5FC-${testname}-clear-objects")
+      add_test (
+          NAME H5FC-${testname}-${testfile}
+          COMMAND "${CMAKE_COMMAND}"
+              -D "TEST_PROGRAM=$<TARGET_FILE:h5format_convert>"
+              -D "TEST_ARGS=${ARGN};outtmp.h5"
+              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/testfiles"
+              -D "TEST_OUTPUT=${testname}.out"
+              -D "TEST_EXPECT=${resultcode}"
+              -D "TEST_REFERENCE=${resultfile}"
+              -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
+      )
+      set_tests_properties (H5FC-${testname}-${testfile} PROPERTIES DEPENDS "H5FC-${testname}-${testfile}-tmpfile")
+      set (last_test "H5FC-${testname}-${testfile}")
+    endif ()
+  endmacro ()
+
   macro (ADD_H5_MASK_OUTPUT testname resultfile resultcode testfile)
     # If using memchecker add tests without using scripts
     if (NOT HDF5_ENABLE_USING_MEMCHECKER)
@@ -433,17 +478,17 @@
 # h5format_convert -d /GROUP/DSET_BT2 --verbose old_h5fc_ext_none.h5 (verbose, bt1 dataset)
 # h5format_convert -d /DSET_NDATA_BT2 -v -n old_h5fc_ext_none.h5 (verbose, noop, bt1+nodata dataset)
 # h5format_convert -v old_h5fc_ext_none.h5 (verbose, all datasets)
-  ADD_H5_OUTPUT (h5fc_v_non_chunked h5fc_v_non_chunked.ddl 0 old_h5fc_ext_none.h5 -d /DSET_CONTIGUOUS -v)
-  ADD_H5_OUTPUT (h5fc_v_bt1 h5fc_v_bt1.ddl 0 old_h5fc_ext_none.h5 -d /GROUP/DSET_BT2 --verbose)
-  ADD_H5_OUTPUT (h5fc_v_ndata_bt1 h5fc_v_ndata_bt1.ddl 0 old_h5fc_ext_none.h5 -d /DSET_NDATA_BT2 -v -n)
-  ADD_H5_OUTPUT (h5fc_v_all h5fc_v_all.ddl 0 old_h5fc_ext_none.h5 -v)
+  ADD_H5_NOERR_OUTPUT (h5fc_v_non_chunked h5fc_v_non_chunked.ddl 0 old_h5fc_ext_none.h5 -d /DSET_CONTIGUOUS -v)
+  ADD_H5_NOERR_OUTPUT (h5fc_v_bt1 h5fc_v_bt1.ddl 0 old_h5fc_ext_none.h5 -d /GROUP/DSET_BT2 --verbose)
+  ADD_H5_NOERR_OUTPUT (h5fc_v_ndata_bt1 h5fc_v_ndata_bt1.ddl 0 old_h5fc_ext_none.h5 -d /DSET_NDATA_BT2 -v -n)
+  ADD_H5_NOERR_OUTPUT (h5fc_v_all h5fc_v_all.ddl 0 old_h5fc_ext_none.h5 -v)
 #
 #
 #
 # h5format_convert -d /DSET_EA -v -n h5fc_ext_none.h5 (verbose, noop, one ea dataset)
 # h5format_convert -v -n h5fc_non_v3.h5 (verbose, noop, all datasets)
-  ADD_H5_OUTPUT (h5fc_v_n_1d h5fc_v_n_1d.ddl 0 h5fc_ext_none.h5 -d /DSET_EA -v -n)
-  ADD_H5_OUTPUT (h5fc_v_n_all h5fc_v_n_all.ddl 0 h5fc_non_v3.h5 -v -n)
+  ADD_H5_NOERR_OUTPUT (h5fc_v_n_1d h5fc_v_n_1d.ddl 0 h5fc_ext_none.h5 -d /DSET_EA -v -n)
+  ADD_H5_NOERR_OUTPUT (h5fc_v_n_all h5fc_v_n_all.ddl 0 h5fc_non_v3.h5 -v -n)
 #
 #
 #
diff --git a/tools/test/h5format_convert/testfiles/h5fc_d_file-d.ddl b/tools/test/h5format_convert/testfiles/h5fc_d_file-d.ddl
new file mode 100644
index 0000000..bc0229c
--- /dev/null
+++ b/tools/test/h5format_convert/testfiles/h5fc_d_file-d.ddl
@@ -0,0 +1,25 @@
+usage: h5format_convert [OPTIONS] file_name
+  OPTIONS
+   -h, --help                Print a usage message and exit
+   -V, --version             Print version number and exit
+   -v, --verbose             Turn on verbose mode
+   -d dname, --dname=dataset_name    Pathname for the dataset
+   -n, --noop                Perform all the steps except the actual conversion
+
+Examples of use:
+
+h5format_convert -d /group/dataset file_name
+  Convert the dataset </group/dataset> in the HDF5 file <file_name>:
+    a. chunked dataset: convert the chunk indexing type to version 1 B-tree
+    b. compact/contiguous dataset: downgrade the layout version to 3
+    c. virtual dataset: no action
+
+h5format_convert file_name
+  Convert all datasets in the HDF5 file <file_name>:
+    a. chunked dataset: convert the chunk indexing type to version 1 B-tree
+    b. compact/contiguous dataset: downgrade the layout version to 3
+    c. virtual dataset: no action
+
+h5format_convert -n -d /group/dataset file_name
+  Go through all the steps except the actual conversion when 
+  converting the dataset </group/dataset> in the HDF5 file <file_name>.
diff --git a/tools/test/h5format_convert/testfiles/h5fc_d_file.ddl b/tools/test/h5format_convert/testfiles/h5fc_d_file.ddl
index 38fc432..bc0229c 100644
--- a/tools/test/h5format_convert/testfiles/h5fc_d_file.ddl
+++ b/tools/test/h5format_convert/testfiles/h5fc_d_file.ddl
@@ -23,4 +23,3 @@ h5format_convert file_name
 h5format_convert -n -d /group/dataset file_name
   Go through all the steps except the actual conversion when 
   converting the dataset </group/dataset> in the HDF5 file <file_name>.
-h5format_convert error: missing file name
diff --git a/tools/test/h5format_convert/testfiles/h5fc_d_file.ddl.err b/tools/test/h5format_convert/testfiles/h5fc_d_file.ddl.err
new file mode 100644
index 0000000..ceb0fe4
--- /dev/null
+++ b/tools/test/h5format_convert/testfiles/h5fc_d_file.ddl.err
@@ -0,0 +1 @@
+h5format_convert error: missing file name
diff --git a/tools/test/h5format_convert/testfiles/h5fc_dname.ddl b/tools/test/h5format_convert/testfiles/h5fc_dname.ddl
index 48564b7..bc0229c 100644
--- a/tools/test/h5format_convert/testfiles/h5fc_dname.ddl
+++ b/tools/test/h5format_convert/testfiles/h5fc_dname.ddl
@@ -23,4 +23,3 @@ h5format_convert file_name
 h5format_convert -n -d /group/dataset file_name
   Go through all the steps except the actual conversion when 
   converting the dataset </group/dataset> in the HDF5 file <file_name>.
-h5format_convert error: No dataset name
diff --git a/tools/test/h5format_convert/testfiles/h5fc_dname.err b/tools/test/h5format_convert/testfiles/h5fc_dname.err
new file mode 100644
index 0000000..361d8a9
--- /dev/null
+++ b/tools/test/h5format_convert/testfiles/h5fc_dname.err
@@ -0,0 +1 @@
+h5format_convert error: No dataset name
diff --git a/tools/test/h5format_convert/testfiles/h5fc_nonexistdset_file.ddl b/tools/test/h5format_convert/testfiles/h5fc_nonexistdset_file.ddl.err
index 39450c0..39450c0 100644
--- a/tools/test/h5format_convert/testfiles/h5fc_nonexistdset_file.ddl
+++ b/tools/test/h5format_convert/testfiles/h5fc_nonexistdset_file.ddl.err
diff --git a/tools/test/h5format_convert/testfiles/h5fc_nonexistfile.ddl b/tools/test/h5format_convert/testfiles/h5fc_nonexistfile.ddl.err
index 706ea9d..706ea9d 100644
--- a/tools/test/h5format_convert/testfiles/h5fc_nonexistfile.ddl
+++ b/tools/test/h5format_convert/testfiles/h5fc_nonexistfile.ddl.err
diff --git a/tools/test/h5format_convert/testh5fc.sh.in b/tools/test/h5format_convert/testh5fc.sh.in
index 585d389..2cdd445 100644
--- a/tools/test/h5format_convert/testh5fc.sh.in
+++ b/tools/test/h5format_convert/testh5fc.sh.in
@@ -103,13 +103,18 @@ $SRC_H5FORMCONV_TESTFILES/old_h5fc_ext3_isf.h5
 $SRC_H5FORMCONV_TESTFILES/h5fc_err_level.h5
 "
 
+LIST_ERR_TEST_FILES="
+$SRC_H5FORMCONV_TESTFILES/h5fc_d_file.ddl.err
+$SRC_H5FORMCONV_TESTFILES/h5fc_dname.err
+$SRC_H5FORMCONV_TESTFILES/h5fc_nonexistfile.ddl.err
+$SRC_H5FORMCONV_TESTFILES/h5fc_nonexistdset_file.ddl.err
+"
+
 LIST_OTHER_TEST_FILES="
 $SRC_H5FORMCONV_TESTFILES/h5fc_help.ddl
 $SRC_H5FORMCONV_TESTFILES/h5fc_nooption.ddl
-$SRC_H5FORMCONV_TESTFILES/h5fc_nonexistfile.ddl
 $SRC_H5FORMCONV_TESTFILES/h5fc_d_file.ddl
 $SRC_H5FORMCONV_TESTFILES/h5fc_dname.ddl
-$SRC_H5FORMCONV_TESTFILES/h5fc_nonexistdset_file.ddl
 $SRC_H5FORMCONV_TESTFILES/h5fc_v_non_chunked.ddl
 $SRC_H5FORMCONV_TESTFILES/h5fc_v_bt1.ddl
 $SRC_H5FORMCONV_TESTFILES/h5fc_v_ndata_bt1.ddl
@@ -137,7 +142,7 @@ $SRC_H5FORMCONV_TESTFILES/h5fc_v_err.ddl.err
 #
 # copy test files and expected output files from source dirs to test dir
 #
-COPY_TESTFILES="$LIST_HDF5_TEST_FILES $LIST_OTHER_TEST_FILES"
+COPY_TESTFILES="$LIST_HDF5_TEST_FILES $LIST_ERR_TEST_FILES $LIST_OTHER_TEST_FILES"
 
 COPY_TESTFILES_TO_TESTDIR()
 {
@@ -193,6 +198,9 @@ TESTING() {
    echo "Testing $* $SPACES" | cut -c1-80 | tr -d '\012'
 }
 
+# Source in the output filter function definitions.
+. $srcdir/../../../bin/output_filter.sh
+
 # Run a test and print PASS or *FAIL*.  If a test fails then increment
 # the `nerrors' global variable and (if $verbose is set) display the
 # difference between the actual output and the expected output. The
@@ -212,8 +220,9 @@ TESTING() {
 TOOLTEST_OUT() {
     # Prepare expected and actual output
     expect="$TESTDIR/$1"
+    expect_err="$TESTDIR/`basename $1 .ddl`.err"
     actual="$TESTDIR/`basename $1 .ddl`.out"
-    actual_err="$TESTDIR/`basename $1 .ddl`.err"
+    actual_err="$TESTDIR/`basename $1 .ddl`.out.err"
     actual_sav=${actual}-sav
     actual_err_sav=${actual_err}-sav
 
@@ -233,7 +242,6 @@ TOOLTEST_OUT() {
     ) >$actual 2>$actual_err
     cp $actual $actual_sav
     cp $actual_err $actual_err_sav
-    cat $actual_err >> $actual
 
     # Compare output
     COMPARE_OUT $expect $actual
@@ -251,7 +259,7 @@ TOOLTEST_MASK_OUT() {
     expect_err="$TESTDIR/$1.err"
     actual_ext="$TESTDIR/$1.ext"
     actual="$TESTDIR/`basename $1 .ddl`.out"
-    actual_err="$TESTDIR/`basename $1 .ddl`.err"
+    actual_err="$TESTDIR/`basename $1 .ddl`.out.err"
     actual_sav=${actual}-sav
     actual_err_sav=${actual_err}-sav
 
@@ -305,6 +313,42 @@ TOOLTEST_MASK_OUT() {
     $RM $actual $actual_err $actual_sav $actual_err_sav
     fi
 }
+# Same as TOOLTEST_OUT except only compares error outout
+TOOLTEST_ERR() {
+    # Prepare expected and actual output
+    expect="$TESTDIR/$1"
+    expect_err="$TESTDIR/$1.err"
+    actual="$TESTDIR/`basename $1 .ddl`.out"
+    actual_err="$TESTDIR/`basename $1 .ddl`.out.err"
+    actual_sav=${actual}-sav
+    actual_err_sav=${actual_err}-sav
+
+    # Prepare the test file
+    $RM $TESTDIR/$TMPOUTFILE
+    TFILE=$2
+    if [ ! -z "$2" ] && [ -e $TESTDIR/$2 ] ; then
+    $CP $TESTDIR/$2 $TESTDIR/$TMPOUTFILE
+    TFILE=$TMPOUTFILE
+    fi
+
+    # Run test.
+    TESTING $FORMCONV $3 $4 $5 $6 $2
+    (
+    cd $TESTDIR
+    $RUNSERIAL $FORMCONV_BIN $3 $4 $5 $6 $TFILE
+    ) >$actual 2>$actual_err
+    cp $actual $actual_sav
+    cp $actual_err $actual_err_sav
+
+    # Compare output
+    COMPARE_OUT $expect_err $actual_err
+
+    # Clean up output file
+    if test -z "$HDF5_NOCLEANUP"; then
+    $RM $actual $actual_err
+    $RM $actual $actual_err $actual_sav $actual_err_sav
+    fi
+}
 
 # To check that the tool exits success, no output
 # Assume all short options
@@ -406,7 +450,7 @@ COPY_TESTFILES_TO_TESTDIR
 # h5format_convert nonexist.h5  (no options, file does not exist)
 TOOLTEST_OUT h5fc_help.ddl '' --help
 TOOLTEST_OUT h5fc_nooption.ddl ''
-TOOLTEST_OUT h5fc_nonexistfile.ddl nonexist.h5
+TOOLTEST_ERR h5fc_nonexistfile.ddl nonexist.h5
 #
 #
 # h5format_convert -d old_h5fc_ext_none.h5 (just -d option, file exists)
@@ -416,7 +460,7 @@ TOOLTEST_OUT h5fc_nonexistfile.ddl nonexist.h5
 TOOLTEST_OUT h5fc_d_file.ddl old_h5fc_ext_none.h5 -d
 TOOLTEST_OUT h5fc_d_file.ddl old_h5fc_ext_none.h5 --dname
 TOOLTEST_OUT h5fc_dname.ddl '' --dname
-TOOLTEST_OUT h5fc_nonexistdset_file.ddl old_h5fc_ext_none.h5 --dname=nonexist
+TOOLTEST_ERR h5fc_nonexistdset_file.ddl old_h5fc_ext_none.h5 --dname=nonexist
 #
 #
 #
diff --git a/tools/test/h5jam/CMakeTests.cmake b/tools/test/h5jam/CMakeTests.cmake
index 66ff715..2d00b86 100644
--- a/tools/test/h5jam/CMakeTests.cmake
+++ b/tools/test/h5jam/CMakeTests.cmake
@@ -74,6 +74,8 @@
               -D "TEST_FOLDER=${PROJECT_BINARY_DIR}"
               -D "TEST_OUTPUT=${expectfile}.out"
               -D "TEST_EXPECT=${resultcode}"
+              -D "TEST_ERRREF=testfiles/${expectfile}.txt"
+              -D "TEST_SKIP_COMPARE=1"
               -D "TEST_REFERENCE=testfiles/${expectfile}.txt"
               -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
       )
diff --git a/tools/test/h5jam/tellub.c b/tools/test/h5jam/tellub.c
index 26c725d..559c677 100644
--- a/tools/test/h5jam/tellub.c
+++ b/tools/test/h5jam/tellub.c
@@ -53,7 +53,7 @@ usage (const char *prog)
 /*-------------------------------------------------------------------------
  * Function:    parse_command_line
  *
- * Purpose:     Parse the command line for the h5dumper.
+ * Purpose:     Parse the command line.
  *
  * Return:      Success:    void
  *              Failure:    Exits program with EXIT_FAILURE value.
@@ -89,7 +89,7 @@ parse_command_line (int argc, const char *argv[])
 /*-------------------------------------------------------------------------
  * Function:    main
  *
- * Purpose:     HDF5 user block unjammer
+ * Purpose:     HDF5 user block tell size
  *
  * Return:      EXIT_SUCCESS/EXIT_FAILURE
  *-------------------------------------------------------------------------
@@ -104,7 +104,7 @@ main (int argc, const char *argv[])
     hsize_t usize;
     htri_t testval;
     herr_t status;
-    hid_t plist = -1;
+    hid_t plist = H5I_INVALID_HID;
 
     h5tools_setprogname(PROGRAMNAME);
     h5tools_setstatus(EXIT_SUCCESS);
diff --git a/tools/test/h5ls/CMakeTests.cmake b/tools/test/h5ls/CMakeTests.cmake
index 488b271..116d097 100644
--- a/tools/test/h5ls/CMakeTests.cmake
+++ b/tools/test/h5ls/CMakeTests.cmake
@@ -47,6 +47,12 @@
       ${HDF5_TOOLS_DIR}/testfiles/tdset_idx.h5
   )
 
+  set (LIST_ERR_TEST_FILES
+      ${HDF5_TOOLS_DIR}/test/h5ls/errfiles/nosuchfile.err
+      ${HDF5_TOOLS_DIR}/test/h5ls/errfiles/textlinksrc-nodangle-1.err
+      ${HDF5_TOOLS_DIR}/test/h5ls/errfiles/tgroup-1.err
+  )
+
   set (LIST_OTHER_TEST_FILES
       ${HDF5_TOOLS_DIR}/testfiles/help-1.ls
       ${HDF5_TOOLS_DIR}/testfiles/help-2.ls
@@ -116,6 +122,10 @@
     get_filename_component(fname "${listfiles}" NAME)
     HDFTEST_COPY_FILE("${listfiles}" "${PROJECT_BINARY_DIR}/testfiles/${fname}" "h5ls_files")
   endforeach ()
+  foreach (listfiles ${LIST_ERR_TEST_FILES})
+    get_filename_component(fname "${listfiles}" NAME)
+    HDFTEST_COPY_FILE("${listfiles}" "${PROJECT_BINARY_DIR}/testfiles/${fname}" "h5ls_files")
+  endforeach ()
   add_custom_target(h5ls_files ALL COMMENT "Copying files needed by h5ls tests" DEPENDS ${h5ls_files_list})
 
 ##############################################################################
@@ -159,6 +169,42 @@
     endif ()
   endmacro ()
 
+  macro (ADD_H5_ERR_TEST resultfile resultcode)
+    # If using memchecker add tests without using scripts
+    if (HDF5_ENABLE_USING_MEMCHECKER)
+      add_test (NAME H5LS-${resultfile} COMMAND $<TARGET_FILE:h5ls> ${ARGN})
+      set_tests_properties (H5LS-${resultfile} PROPERTIES WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/testfiles")
+      if ("${resultcode}" STREQUAL "1")
+        set_tests_properties (H5LS-${resultfile} PROPERTIES WILL_FAIL "true")
+      endif ()
+      if (NOT "${last_test}" STREQUAL "")
+        set_tests_properties (H5LS-${resultfile} PROPERTIES DEPENDS ${last_test})
+      endif ()
+    else ()
+      # Remove any output file left over from previous test run
+      add_test (
+          NAME H5LS-${resultfile}-clear-objects
+          COMMAND    ${CMAKE_COMMAND}
+              -E remove
+              testfiles/${resultfile}.out
+              testfiles/${resultfile}.out.err
+      )
+      add_test (
+          NAME H5LS-${resultfile}
+          COMMAND "${CMAKE_COMMAND}"
+              -D "TEST_PROGRAM=$<TARGET_FILE:h5ls>"
+              -D "TEST_ARGS=${ARGN}"
+              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/testfiles"
+              -D "TEST_OUTPUT=${resultfile}.out"
+              -D "TEST_EXPECT=${resultcode}"
+              -D "TEST_REFERENCE=${resultfile}.ls"
+              -D "TEST_ERRREF=${resultfile}.err"
+              -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
+      )
+      set_tests_properties (H5LS-${resultfile} PROPERTIES DEPENDS H5LS-${resultfile}-clear-objects)
+    endif ()
+  endmacro ()
+
   macro (ADD_H5_UD_TEST testname resultcode resultfile)
     if (NOT HDF5_ENABLE_USING_MEMCHECKER)
       # Remove any output file left over from previous test run
@@ -341,7 +387,7 @@
   # test for displaying groups
   # The following combination of arguments is expected to return an error message
   # and return value 1
-  ADD_H5_TEST (tgroup-1 1 -w80 -r -g tgroup.h5)
+  ADD_H5_ERR_TEST (tgroup-1 1 -w80 -r -g tgroup.h5)
   ADD_H5_TEST (tgroup-2 0 -w80 -g tgroup.h5/g1)
 
   # test for files with groups that have long comments
@@ -382,7 +428,7 @@
   # tests for no-dangling-links
   # if this option is given on dangling link, h5ls should return exit code 1
   # when used alone , expect to print out help and return exit code 1
-  ADD_H5_TEST (textlinksrc-nodangle-1 1 -w80 --no-dangling-links textlinksrc.h5)
+  ADD_H5_ERR_TEST (textlinksrc-nodangle-1 1 -w80 --no-dangling-links textlinksrc.h5)
   # external dangling link - expected exit code 1
   ADD_H5_TEST (textlinksrc-nodangle-2 1 -w80 --follow-symlinks --no-dangling-links textlinksrc.h5)
   # soft dangling link - expected exit code 1
@@ -444,7 +490,7 @@
   endif ()
 
   # test for non-existing file
-  ADD_H5_TEST (nosuchfile 1 nosuchfile.h5)
+  ADD_H5_ERR_TEST (nosuchfile 1 nosuchfile.h5)
 
   # test for variable length data types in verbose mode
   if (H5_WORDS_BIGENDIAN)
diff --git a/tools/test/h5ls/errfiles/nosuchfile.err b/tools/test/h5ls/errfiles/nosuchfile.err
new file mode 100644
index 0000000..8c4ee42
--- /dev/null
+++ b/tools/test/h5ls/errfiles/nosuchfile.err
@@ -0,0 +1 @@
+nosuchfile.h5: unable to open file
diff --git a/tools/test/h5ls/errfiles/textlinksrc-nodangle-1.err b/tools/test/h5ls/errfiles/textlinksrc-nodangle-1.err
new file mode 100644
index 0000000..8991fc1
--- /dev/null
+++ b/tools/test/h5ls/errfiles/textlinksrc-nodangle-1.err
@@ -0,0 +1,2 @@
+Error: --no-dangling-links must be used along with --follow-symlinks option!
+
diff --git a/tools/test/h5ls/errfiles/tgroup-1.err b/tools/test/h5ls/errfiles/tgroup-1.err
new file mode 100644
index 0000000..ba4cf07
--- /dev/null
+++ b/tools/test/h5ls/errfiles/tgroup-1.err
@@ -0,0 +1,2 @@
+Error: 'recursive' option not compatible with 'group info' option!
+
diff --git a/tools/test/h5ls/testh5ls.sh.in b/tools/test/h5ls/testh5ls.sh.in
index 8c6551b..353f1bb 100644
--- a/tools/test/h5ls/testh5ls.sh.in
+++ b/tools/test/h5ls/testh5ls.sh.in
@@ -53,6 +53,7 @@ SRC_H5REPACK_TESTFILES="$SRC_TOOLS/test/h5repack/testfiles"
 SRC_H5JAM_TESTFILES="$SRC_TOOLS/test/h5jam/testfiles"
 SRC_H5STAT_TESTFILES="$SRC_TOOLS/test/h5stat/testfiles"
 SRC_H5IMPORT_TESTFILES="$SRC_TOOLS/test/h5import/testfiles"
+SRC_H5LS_ERRFILES="$SRC_TOOLS/test/h5ls/errfiles"
 
 TESTDIR=./testfiles
 test -d $TESTDIR || mkdir $TESTDIR
@@ -93,6 +94,12 @@ $SRC_H5LS_TESTFILES/tvldtypes1.h5
 $SRC_H5LS_TESTFILES/tdset_idx.h5
 "
 
+LIST_ERROR_TEST_FILES="
+$SRC_H5LS_ERRFILES/nosuchfile.err
+$SRC_H5LS_ERRFILES/textlinksrc-nodangle-1.err
+$SRC_H5LS_ERRFILES/tgroup-1.err
+"
+
 LIST_OTHER_TEST_FILES="
 $SRC_H5LS_TESTFILES/help-1.ls
 $SRC_H5LS_TESTFILES/help-2.ls
@@ -228,8 +235,9 @@ TESTING() {
 # $2 and on -- argument for the h5ls tool
 TOOLTEST() {
     expect="$TESTDIR/$1"
+    expect_err="$TESTDIR/`basename $1 .ls`.err"
     actual="$TESTDIR/`basename $1 .ls`.out"
-    actual_err="$TESTDIR/`basename $1 .ls`.err"
+    actual_err="$TESTDIR/`basename $1 .ls`.out.err"
     actual_sav=${actual}-sav
     actual_err_sav=${actual_err}-sav
     shift
@@ -251,7 +259,6 @@ TOOLTEST() {
     STDOUT_FILTER $actual
     cp $actual_err $actual_err_sav
     STDERR_FILTER $actual_err
-    cat $actual_err >> $actual
     if [ $h5haveexitcode = 'yes' -a $exitcode -ne $retvalexpect ]; then
         echo "*FAILED*"
         nerrors="`expr $nerrors + 1`"
diff --git a/tools/test/h5repack/CMakeTests.cmake b/tools/test/h5repack/CMakeTests.cmake
index 3ee5e27..c2a2be7 100644
--- a/tools/test/h5repack/CMakeTests.cmake
+++ b/tools/test/h5repack/CMakeTests.cmake
@@ -16,39 +16,6 @@
 ##############################################################################
 ##############################################################################
 
-  if (HDF5_TEST_VFD)
-    set (VFD_LIST
-        sec2
-        stdio
-        core
-        split
-        multi
-        family
-    )
-
-    if (DIRECT_VFD)
-      set (VFD_LIST ${VFD_LIST} direct)
-    endif ()
-
-    macro (ADD_VFD_TEST vfdname resultcode)
-      add_test (
-        NAME H5REPACK-VFD-${vfdname}-h5repacktest
-        COMMAND "${CMAKE_COMMAND}"
-            -D "TEST_PROGRAM=$<TARGET_FILE:h5repacktest>"
-            -D "TEST_ARGS:STRING="
-            -D "TEST_VFD:STRING=${vfdname}"
-            -D "TEST_EXPECT=${resultcode}"
-            -D "TEST_OUTPUT=h5repacktest"
-            -D "TEST_FOLDER=${PROJECT_BINARY_DIR}"
-            -P "${HDF_RESOURCES_DIR}/vfdTest.cmake"
-      )
-      if (NOT "${last_test}" STREQUAL "")
-        set_tests_properties (H5REPACK-VFD-${vfdname}-h5repacktest PROPERTIES DEPENDS ${last_test})
-      endif ()
-      set (last_test "H5REPACK-VFD-${vfdname}-h5repacktest")
-    endmacro ()
-  endif ()
-
   # --------------------------------------------------------------------
   # Copy all the HDF5 files from the source directory into the test directory
   # --------------------------------------------------------------------
@@ -377,7 +344,8 @@
                 -D "TEST_OUTPUT=${resultfile}-${testname}.out"
                 -D "TEST_EXPECT=${resultcode}"
                 -D "TEST_MASK_ERROR=true"
-                -D "TEST_REFERENCE=${resultfile}-${testname}.tst"
+                -D "TEST_REFERENCE=${resultfile}.mty"
+                -D "TEST_ERRREF=${resultfile}-${testname}.tst"
                 -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
         )
         set_tests_properties (H5REPACK_MASK-${testname} PROPERTIES DEPENDS H5REPACK_MASK-${testname}-clear-objects)
@@ -1458,9 +1426,12 @@ if (BUILD_SHARED_LIBS)
   ADD_H5_UD_TEST (plugin_zero 0 h5repack_layout.h5 -v -f UD=250,0,0)
 endif ()
 
-  if (HDF5_TEST_VFD)
-    # Run test with different Virtual File Driver
-    foreach (vfd ${VFD_LIST})
-      ADD_VFD_TEST (${vfd} 0)
-    endforeach ()
-  endif ()
+##############################################################################
+##############################################################################
+###                         V F D   T E S T S                              ###
+##############################################################################
+##############################################################################
+
+if (HDF5_TEST_VFD)
+  include (CMakeVFDTests.cmake)
+endif ()
diff --git a/tools/test/h5repack/CMakeVFDTests.cmake b/tools/test/h5repack/CMakeVFDTests.cmake
new file mode 100644
index 0000000..2042f31
--- /dev/null
+++ b/tools/test/h5repack/CMakeVFDTests.cmake
@@ -0,0 +1,65 @@
+#
+# Copyright by The HDF Group.
+# All rights reserved.
+#
+# This file is part of HDF5.  The full HDF5 copyright notice, including
+# terms governing use, modification, and redistribution, is contained in
+# the COPYING file, which can be found at the root of the source code
+# distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.
+# If you do not have access to either file, you may request a copy from
+# help@hdfgroup.org.
+#
+
+##############################################################################
+##############################################################################
+###           T E S T I N G                                                ###
+##############################################################################
+##############################################################################
+
+    set (VFD_LIST
+        sec2
+        stdio
+        core
+        split
+        multi
+        family
+    )
+
+    if (DIRECT_VFD)
+      set (VFD_LIST ${VFD_LIST} direct)
+    endif ()
+
+##############################################################################
+##############################################################################
+###           T H E   T E S T S  M A C R O S                               ###
+##############################################################################
+##############################################################################
+
+  macro (ADD_VFD_TEST vfdname resultcode)
+    add_test (
+      NAME H5REPACK-VFD-${vfdname}-h5repacktest
+      COMMAND "${CMAKE_COMMAND}"
+          -D "TEST_PROGRAM=$<TARGET_FILE:h5repacktest>"
+          -D "TEST_ARGS:STRING="
+          -D "TEST_VFD:STRING=${vfdname}"
+          -D "TEST_EXPECT=${resultcode}"
+          -D "TEST_OUTPUT=h5repacktest"
+          -D "TEST_FOLDER=${PROJECT_BINARY_DIR}"
+          -P "${HDF_RESOURCES_DIR}/vfdTest.cmake"
+    )
+    if (NOT "${last_test}" STREQUAL "")
+      set_tests_properties (H5REPACK-VFD-${vfdname}-h5repacktest PROPERTIES DEPENDS ${last_test})
+    endif ()
+    set (last_test "H5REPACK-VFD-${vfdname}-h5repacktest")
+  endmacro ()
+
+##############################################################################
+##############################################################################
+###           T H E   T E S T S                                            ###
+##############################################################################
+##############################################################################
+
+  # Run test with different Virtual File Driver
+  foreach (vfd ${VFD_LIST})
+    ADD_VFD_TEST (${vfd} 0)
+  endforeach ()
diff --git a/tools/test/h5stat/CMakeTests.cmake b/tools/test/h5stat/CMakeTests.cmake
index bd55ac1..ec8c9b1 100644
--- a/tools/test/h5stat/CMakeTests.cmake
+++ b/tools/test/h5stat/CMakeTests.cmake
@@ -39,23 +39,30 @@
       h5stat_newgrat
       h5stat_newgrat-UG
       h5stat_newgrat-UA
-      h5stat_err1_links
       h5stat_idx
       h5stat_links1
       h5stat_links2
       h5stat_links3
       h5stat_links4
       h5stat_links5
-      h5stat_err1_dims
       h5stat_dims1
       h5stat_dims2
-      h5stat_err1_numattrs
-      h5stat_err2_numattrs
       h5stat_numattrs1
       h5stat_numattrs2
       h5stat_numattrs3
       h5stat_numattrs4
   )
+  set (HDF5_REFERENCE_ERR_FILES
+      h5stat_err_refcount
+      h5stat_err_old_layout
+      h5stat_err_old_fill
+      h5stat_err1_dims
+      h5stat_err1_links
+      h5stat_err1_numattrs
+      h5stat_err2_numattrs
+      h5stat_notexist
+      h5stat_nofile
+  )
   set (HDF5_REFERENCE_TEST_FILES
       h5stat_err_refcount.h5
       h5stat_err_old_layout.h5
@@ -71,6 +78,10 @@
     HDFTEST_COPY_FILE("${HDF5_TOOLS_TEST_H5STAT_SOURCE_DIR}/testfiles/${ddl_file}.ddl" "${PROJECT_BINARY_DIR}/${ddl_file}.ddl" "h5stat_files")
   endforeach ()
 
+  foreach (h5_file ${HDF5_REFERENCE_ERR_FILES})
+    HDFTEST_COPY_FILE("${HDF5_TOOLS_TEST_H5STAT_SOURCE_DIR}/testfiles/${h5_file}.err" "${PROJECT_BINARY_DIR}/${h5_file}.err" "h5stat_files")
+  endforeach ()
+
   foreach (h5_file ${HDF5_REFERENCE_TEST_FILES})
     HDFTEST_COPY_FILE("${HDF5_TOOLS_TEST_H5STAT_SOURCE_DIR}/testfiles/${h5_file}" "${PROJECT_BINARY_DIR}/${h5_file}" "h5stat_files")
   endforeach ()
@@ -118,6 +129,43 @@
     endif ()
   endmacro ()
 
+  macro (ADD_H5_ERR_TEST resultfile resultcode)
+    # If using memchecker add tests without using scripts
+    if (HDF5_ENABLE_USING_MEMCHECKER)
+      add_test (NAME H5STAT-${resultfile} COMMAND $<TARGET_FILE:h5stat> ${ARGN})
+      if (NOT "${resultcode}" STREQUAL "0")
+        set_tests_properties (H5STAT-${resultfile} PROPERTIES WILL_FAIL "true")
+      endif ()
+      if (NOT "${last_test}" STREQUAL "")
+        set_tests_properties (H5STAT-${resultfile} PROPERTIES DEPENDS ${last_test})
+      endif ()
+    else (HDF5_ENABLE_USING_MEMCHECKER)
+      add_test (
+          NAME H5STAT-${resultfile}-clear-objects
+          COMMAND    ${CMAKE_COMMAND}
+              -E remove
+              ${resultfile}.out
+              ${resultfile}.out.err
+      )
+      if (NOT "${last_test}" STREQUAL "")
+        set_tests_properties (H5STAT-${resultfile}-clear-objects PROPERTIES DEPENDS ${last_test})
+      endif ()
+      add_test (
+          NAME H5STAT-${resultfile}
+          COMMAND "${CMAKE_COMMAND}"
+              -D "TEST_PROGRAM=$<TARGET_FILE:h5stat>"
+              -D "TEST_ARGS=${ARGN}"
+              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}"
+              -D "TEST_OUTPUT=${resultfile}.out"
+              -D "TEST_EXPECT=${resultcode}"
+              -D "TEST_REFERENCE=${resultfile}.mty"
+              -D "TEST_ERRREF=${resultfile}.err"
+              -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
+      )
+      set_tests_properties (H5STAT-${resultfile} PROPERTIES DEPENDS H5STAT-${resultfile}-clear-objects)
+    endif ()
+  endmacro ()
+
 ##############################################################################
 ##############################################################################
 ###           T H E   T E S T S                                            ###
@@ -173,7 +221,7 @@
 #   -g -l 8
 #   --links=8
 #   --links=20 -g
-  ADD_H5_TEST (h5stat_err1_links 1 -l 0 h5stat_threshold.h5)
+  ADD_H5_ERR_TEST (h5stat_err1_links 1 -l 0 h5stat_threshold.h5)
   ADD_H5_TEST (h5stat_links1 0 -g -l 8 h5stat_threshold.h5)
   ADD_H5_TEST (h5stat_links2 0 --links=8 h5stat_threshold.h5)
   ADD_H5_TEST (h5stat_links3 0 --links=20 -g h5stat_threshold.h5)
@@ -188,7 +236,7 @@
 #   -d --dims=-1 (incorrect threshold value)
 #   -gd -m 5
 #   -d --di=15
-  ADD_H5_TEST (h5stat_err1_dims 1 -d --dims=-1 h5stat_threshold.h5)
+  ADD_H5_ERR_TEST (h5stat_err1_dims 1 -d --dims=-1 h5stat_threshold.h5)
   ADD_H5_TEST (h5stat_dims1 0 -gd -m 5 h5stat_threshold.h5)
   ADD_H5_TEST (h5stat_dims2 0 -d --di=15 h5stat_threshold.h5)
 #
@@ -198,8 +246,8 @@
 #   -AS -a 10
 #   -a 1
 #   -A --numattrs=25
-  ADD_H5_TEST (h5stat_err1_numattrs 1 -a -2 h5stat_threshold.h5)
-  ADD_H5_TEST (h5stat_err2_numattrs 1 --numattrs h5stat_threshold.h5)
+  ADD_H5_ERR_TEST (h5stat_err1_numattrs 1 -a -2 h5stat_threshold.h5)
+  ADD_H5_ERR_TEST (h5stat_err2_numattrs 1 --numattrs h5stat_threshold.h5)
   ADD_H5_TEST (h5stat_numattrs1 0 -AS -a 10 h5stat_threshold.h5)
   ADD_H5_TEST (h5stat_numattrs2 0 -a 1 h5stat_threshold.h5)
   ADD_H5_TEST (h5stat_numattrs3 0 -A --numattrs=25 h5stat_threshold.h5)
diff --git a/tools/test/h5stat/testfiles/h5stat_err1_dims.ddl b/tools/test/h5stat/testfiles/h5stat_err1_dims.err
index 86d375b..86d375b 100644
--- a/tools/test/h5stat/testfiles/h5stat_err1_dims.ddl
+++ b/tools/test/h5stat/testfiles/h5stat_err1_dims.err
diff --git a/tools/test/h5stat/testfiles/h5stat_err1_links.ddl b/tools/test/h5stat/testfiles/h5stat_err1_links.err
index d43207c..d43207c 100644
--- a/tools/test/h5stat/testfiles/h5stat_err1_links.ddl
+++ b/tools/test/h5stat/testfiles/h5stat_err1_links.err
diff --git a/tools/test/h5stat/testfiles/h5stat_err2_numattrs.ddl b/tools/test/h5stat/testfiles/h5stat_err1_numattrs.err
index 01b6c18..01b6c18 100644
--- a/tools/test/h5stat/testfiles/h5stat_err2_numattrs.ddl
+++ b/tools/test/h5stat/testfiles/h5stat_err1_numattrs.err
diff --git a/tools/test/h5stat/testfiles/h5stat_err1_numattrs.ddl b/tools/test/h5stat/testfiles/h5stat_err2_numattrs.err
index 01b6c18..01b6c18 100644
--- a/tools/test/h5stat/testfiles/h5stat_err1_numattrs.ddl
+++ b/tools/test/h5stat/testfiles/h5stat_err2_numattrs.err
diff --git a/tools/test/h5stat/testfiles/h5stat_err_old_fill.ddl b/tools/test/h5stat/testfiles/h5stat_err_old_fill.ddl
index e751b7f..5cc1e32 100644
--- a/tools/test/h5stat/testfiles/h5stat_err_old_fill.ddl
+++ b/tools/test/h5stat/testfiles/h5stat_err_old_fill.ddl
@@ -1,2 +1 @@
 Filename: h5stat_err_old_fill.h5
-h5stat error: unable to traverse objects/links in file "h5stat_err_old_fill.h5"
diff --git a/tools/test/h5stat/testfiles/h5stat_err_old_fill.err b/tools/test/h5stat/testfiles/h5stat_err_old_fill.err
new file mode 100644
index 0000000..8b886d2
--- /dev/null
+++ b/tools/test/h5stat/testfiles/h5stat_err_old_fill.err
@@ -0,0 +1 @@
+h5stat error: unable to traverse objects/links in file "h5stat_err_old_fill.h5"
diff --git a/tools/test/h5stat/testfiles/h5stat_err_old_layout.ddl b/tools/test/h5stat/testfiles/h5stat_err_old_layout.ddl
index a3e27e2..112190c 100644
--- a/tools/test/h5stat/testfiles/h5stat_err_old_layout.ddl
+++ b/tools/test/h5stat/testfiles/h5stat_err_old_layout.ddl
@@ -1,2 +1 @@
 Filename: h5stat_err_old_layout.h5
-h5stat error: unable to traverse objects/links in file "h5stat_err_old_layout.h5"
diff --git a/tools/test/h5stat/testfiles/h5stat_err_old_layout.err b/tools/test/h5stat/testfiles/h5stat_err_old_layout.err
new file mode 100644
index 0000000..7aa2fa7
--- /dev/null
+++ b/tools/test/h5stat/testfiles/h5stat_err_old_layout.err
@@ -0,0 +1 @@
+h5stat error: unable to traverse objects/links in file "h5stat_err_old_layout.h5"
diff --git a/tools/test/h5stat/testfiles/h5stat_err_refcount.ddl b/tools/test/h5stat/testfiles/h5stat_err_refcount.ddl
index 1f1b491..41e533e 100644
--- a/tools/test/h5stat/testfiles/h5stat_err_refcount.ddl
+++ b/tools/test/h5stat/testfiles/h5stat_err_refcount.ddl
@@ -1,2 +1 @@
 Filename: h5stat_err_refcount.h5
-h5stat error: unable to traverse objects/links in file "h5stat_err_refcount.h5"
diff --git a/tools/test/h5stat/testfiles/h5stat_err_refcount.err b/tools/test/h5stat/testfiles/h5stat_err_refcount.err
new file mode 100644
index 0000000..d176996
--- /dev/null
+++ b/tools/test/h5stat/testfiles/h5stat_err_refcount.err
@@ -0,0 +1 @@
+h5stat error: unable to traverse objects/links in file "h5stat_err_refcount.h5"
diff --git a/tools/test/h5stat/testfiles/h5stat_nofile.ddl b/tools/test/h5stat/testfiles/h5stat_nofile.ddl
index 7171320..01e39af 100644
--- a/tools/test/h5stat/testfiles/h5stat_nofile.ddl
+++ b/tools/test/h5stat/testfiles/h5stat_nofile.ddl
@@ -23,4 +23,3 @@ Usage: h5stat [OPTIONS] file
      -s, --freespace       Print free space information
      -S, --summary         Print summary of file space information
      --enable-error-stack  Prints messages from the HDF5 error stack as they occur
-h5stat error: missing file name
diff --git a/tools/test/h5stat/testfiles/h5stat_nofile.err b/tools/test/h5stat/testfiles/h5stat_nofile.err
new file mode 100644
index 0000000..3b7e979
--- /dev/null
+++ b/tools/test/h5stat/testfiles/h5stat_nofile.err
@@ -0,0 +1 @@
+h5stat error: missing file name
diff --git a/tools/test/h5stat/testfiles/h5stat_notexist.ddl b/tools/test/h5stat/testfiles/h5stat_notexist.ddl
index cc25e43..7f71941 100644
--- a/tools/test/h5stat/testfiles/h5stat_notexist.ddl
+++ b/tools/test/h5stat/testfiles/h5stat_notexist.ddl
@@ -1,2 +1 @@
 Filename: notexist.h5
-h5stat error: unable to open file "notexist.h5"
diff --git a/tools/test/h5stat/testfiles/h5stat_notexist.err b/tools/test/h5stat/testfiles/h5stat_notexist.err
new file mode 100644
index 0000000..c1d9e54
--- /dev/null
+++ b/tools/test/h5stat/testfiles/h5stat_notexist.err
@@ -0,0 +1 @@
+h5stat error: unable to open file "notexist.h5"
diff --git a/tools/test/h5stat/testh5stat.sh.in b/tools/test/h5stat/testh5stat.sh.in
index 0a5127f..69b856e 100644
--- a/tools/test/h5stat/testh5stat.sh.in
+++ b/tools/test/h5stat/testh5stat.sh.in
@@ -79,6 +79,18 @@ $SRC_H5STAT_TESTFILES/h5stat_idx.h5
 $SRC_H5STAT_TESTFILES/h5stat_threshold.h5
 "
 
+LIST_ERR_TEST_FILES="
+$SRC_H5STAT_TESTFILES/h5stat_err_refcount.err
+$SRC_H5STAT_TESTFILES/h5stat_err_old_layout.err
+$SRC_H5STAT_TESTFILES/h5stat_err_old_fill.err
+$SRC_H5STAT_TESTFILES/h5stat_err1_links.err
+$SRC_H5STAT_TESTFILES/h5stat_err1_dims.err
+$SRC_H5STAT_TESTFILES/h5stat_err1_numattrs.err
+$SRC_H5STAT_TESTFILES/h5stat_err2_numattrs.err
+$SRC_H5STAT_TESTFILES/h5stat_notexist.err
+$SRC_H5STAT_TESTFILES/h5stat_nofile.err
+"
+
 LIST_OTHER_TEST_FILES="
 $SRC_H5STAT_TESTFILES/h5stat_err_refcount.ddl
 $SRC_H5STAT_TESTFILES/h5stat_err_old_layout.ddl
@@ -100,17 +112,13 @@ $SRC_H5STAT_TESTFILES/h5stat_newgrat.ddl
 $SRC_H5STAT_TESTFILES/h5stat_newgrat-UG.ddl
 $SRC_H5STAT_TESTFILES/h5stat_newgrat-UA.ddl
 $SRC_H5STAT_TESTFILES/h5stat_idx.ddl
-$SRC_H5STAT_TESTFILES/h5stat_err1_links.ddl
 $SRC_H5STAT_TESTFILES/h5stat_links1.ddl
 $SRC_H5STAT_TESTFILES/h5stat_links2.ddl
 $SRC_H5STAT_TESTFILES/h5stat_links3.ddl
 $SRC_H5STAT_TESTFILES/h5stat_links4.ddl
 $SRC_H5STAT_TESTFILES/h5stat_links5.ddl
-$SRC_H5STAT_TESTFILES/h5stat_err1_dims.ddl
 $SRC_H5STAT_TESTFILES/h5stat_dims1.ddl
 $SRC_H5STAT_TESTFILES/h5stat_dims2.ddl
-$SRC_H5STAT_TESTFILES/h5stat_err1_numattrs.ddl
-$SRC_H5STAT_TESTFILES/h5stat_err2_numattrs.ddl
 $SRC_H5STAT_TESTFILES/h5stat_numattrs1.ddl
 $SRC_H5STAT_TESTFILES/h5stat_numattrs2.ddl
 $SRC_H5STAT_TESTFILES/h5stat_numattrs3.ddl
@@ -120,7 +128,7 @@ $SRC_H5STAT_TESTFILES/h5stat_numattrs4.ddl
 #
 # copy test files and expected output files from source dirs to test dir
 #
-COPY_TESTFILES="$LIST_HDF5_TEST_FILES $LIST_OTHER_TEST_FILES"
+COPY_TESTFILES="$LIST_HDF5_TEST_FILES $LIST_ERR_TEST_FILES $LIST_OTHER_TEST_FILES"
 
 COPY_TESTFILES_TO_TESTDIR()
 {
@@ -184,8 +192,9 @@ TESTING() {
 #
 TOOLTEST() {
    expect="$TESTDIR/$1"
+   expect_err="$TESTDIR/`basename $1 .ddl`.err"
    actual="$TESTDIR/`basename $1 .ddl`.out"
-   actual_err="$TESTDIR/`basename $1 .ddl`.err"
+   actual_err="$TESTDIR/`basename $1 .ddl`.out.err"
    actual_sav=${actual}-sav
    actual_err_sav=${actual_err}-sav
    shift
@@ -202,14 +211,17 @@ TOOLTEST() {
    STDOUT_FILTER $actual
    cp $actual_err $actual_err_sav
    STDERR_FILTER $actual_err
-   cat $actual_err >> $actual
 
    if [ ! -f $expect ]; then
-      # Create the expect file if it doesn't yet exist.
-      echo " CREATED"
-      cp $actual $expect
-      echo "    Expected result (*.ddl) missing"
-      nerrors="`expr $nerrors + 1`"
+      # Compare error files if the expect file doesn't exist.
+      if $CMP $expect_err $actual_err; then
+         echo " PASSED"
+      else
+         echo "*FAILED*"
+         echo "    Expected result (*.err) differs from actual result (*.out.err)"
+         nerrors="`expr $nerrors + 1`"
+         test yes = "$verbose" && $DIFF $expect_err $actual_err |sed 's/^/    /'
+      fi
    elif $CMP $expect $actual; then
       echo " PASSED"
    else
diff --git a/tools/test/misc/CMakeTestsClear.cmake b/tools/test/misc/CMakeTestsClear.cmake
index a51d0e9..c46ac59 100644
--- a/tools/test/misc/CMakeTestsClear.cmake
+++ b/tools/test/misc/CMakeTestsClear.cmake
@@ -49,8 +49,6 @@
       h5clear_missing_file.ddl
       h5clear_noclose_after_size.ddl
       h5clear_noclose_before_size.ddl
-      h5clear_no_mdc_image.ddl
-      h5clear_open_fail.ddl
       h5clear_status_noclose_after_size.ddl
       h5clear_usage.ddl
       h5clear_user_equal_after_size.ddl
@@ -60,10 +58,17 @@
       h5clear_user_less_after_size.ddl
       h5clear_user_less_before_size.ddl
   )
+  set (HDF5_REFERENCE_ERR_FILES
+      h5clear_no_mdc_image.err
+      h5clear_open_fail.err
+  )
 
   foreach (h5_file ${HDF5_TEST_FILES} ${HDF5_SEC2_TEST_FILES} ${HDF5_REFERENCE_TEST_FILES})
     HDFTEST_COPY_FILE("${PROJECT_SOURCE_DIR}/testfiles/${h5_file}" "${PROJECT_BINARY_DIR}/testfiles/${h5_file}" "h5clear_files")
   endforeach ()
+  foreach (h5_file ${HDF5_REFERENCE_ERR_FILES})
+    HDFTEST_COPY_FILE("${PROJECT_SOURCE_DIR}/testfiles/${h5_file}" "${PROJECT_BINARY_DIR}/testfiles/${h5_file}" "h5clear_files")
+  endforeach ()
   # make second copy of h5clear_sec2.h5
   foreach (h5_file ${HDF5_SEC2_TEST_FILES})
     HDFTEST_COPY_FILE("${PROJECT_SOURCE_DIR}/testfiles/${h5_file}" "${PROJECT_BINARY_DIR}/testfiles/orig_${h5_file}" "h5clear_files")
@@ -108,6 +113,35 @@
     endif ()
   endmacro ()
 
+  macro (ADD_H5_ERR_CMP testname resultfile resultcode)
+    if (NOT HDF5_ENABLE_USING_MEMCHECKER)
+      add_test (
+          NAME H5CLEAR_CMP-${testname}-clear-objects
+          COMMAND    ${CMAKE_COMMAND}
+              -E remove
+                  testfiles/${testname}.out
+                  testfiles/${testname}.out.err
+      )
+      if (NOT "${last_test}" STREQUAL "")
+        set_tests_properties (H5CLEAR_CMP-${testname}-clear-objects PROPERTIES DEPENDS ${last_test})
+      endif ()
+      add_test (
+          NAME H5CLEAR_CMP-${testname}
+          COMMAND "${CMAKE_COMMAND}"
+              -D "TEST_PROGRAM=$<TARGET_FILE:h5clear>"
+              -D "TEST_ARGS:STRING=${ARGN}"
+              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/testfiles"
+              -D "TEST_OUTPUT=${testname}.out"
+              -D "TEST_EXPECT=${resultcode}"
+              -D "TEST_REFERENCE=${resultfile}.mty"
+              -D "TEST_ERRREF=${resultfile}.err"
+              -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
+      )
+      set_tests_properties (H5CLEAR_CMP-${testname} PROPERTIES DEPENDS H5CLEAR_CMP-${testname}-clear-objects)
+      set (last_test "H5CLEAR_CMP-${testname}")
+    endif ()
+  endmacro ()
+
   macro (ADD_H5_CMP_WITH_COPY testname resultcode resultfile testfile)
     if (NOT HDF5_ENABLE_USING_MEMCHECKER)
       add_test (
@@ -144,6 +178,43 @@
     endif ()
   endmacro ()
 
+  macro (ADD_H5_ERR_CMP_WITH_COPY testname resultcode resultfile testfile)
+    if (NOT HDF5_ENABLE_USING_MEMCHECKER)
+      add_test (
+          NAME H5CLEAR_CMP-${testname}-clear-objects
+          COMMAND    ${CMAKE_COMMAND}
+              -E remove
+                  testfiles/${testname}.out
+                  testfiles/${testname}.out.err
+                  testfiles/${testfile}
+      )
+      if (NOT "${last_test}" STREQUAL "")
+        set_tests_properties (H5CLEAR_CMP-${testname}-clear-objects PROPERTIES DEPENDS ${last_test})
+      endif ()
+      add_test (
+          NAME H5CLEAR_CMP-copy_${testname}
+          COMMAND    ${CMAKE_COMMAND}
+              -E copy_if_different
+              "${PROJECT_SOURCE_DIR}/testfiles/${testfile}" "${PROJECT_BINARY_DIR}/testfiles/${testfile}"
+      )
+      set_tests_properties (H5CLEAR_CMP-copy_${testname} PROPERTIES DEPENDS H5CLEAR_CMP-${testname}-clear-objects)
+      add_test (
+          NAME H5CLEAR_CMP-${testname}
+          COMMAND "${CMAKE_COMMAND}"
+              -D "TEST_PROGRAM=$<TARGET_FILE:h5clear>"
+              -D "TEST_ARGS:STRING=${ARGN};${testfile}"
+              -D "TEST_FOLDER=${PROJECT_BINARY_DIR}/testfiles"
+              -D "TEST_OUTPUT=${testname}.out"
+              -D "TEST_EXPECT=${resultcode}"
+              -D "TEST_REFERENCE=${resultfile}.mty"
+              -D "TEST_ERRREF=${resultfile}.err"
+              -P "${HDF_RESOURCES_EXT_DIR}/runTest.cmake"
+      )
+      set_tests_properties (H5CLEAR_CMP-${testname} PROPERTIES DEPENDS H5CLEAR_CMP-copy_${testname})
+      set (last_test "H5CLEAR_CMP-${testname}")
+    endif ()
+  endmacro ()
+
   macro (ADD_H5_RETTEST testname resultcode)
     if (NOT HDF5_ENABLE_USING_MEMCHECKER)
       add_test (
@@ -347,11 +418,11 @@ endif()
   ADD_H5_CMP (h5clr_usage_junk h5clear_usage 1 "" junk.h5)
   ADD_H5_CMP (h5clr_usage_none h5clear_usage 1 "" orig_h5clear_sec2_v3.h5)
   ADD_H5_CMP (h5clr_missing_file_m h5clear_missing_file 1 "-m")
-  ADD_H5_CMP (h5clr_open_fail_s h5clear_open_fail 1 "-s" junk.h5)
+  ADD_H5_ERR_CMP (h5clr_open_fail_s h5clear_open_fail 1 "-s" junk.h5)
   ADD_H5_CMP (h5clr_missing_file_ms h5clear_missing_file 1 "-m" "-s")
-  ADD_H5_CMP (h5clr_open_fail_ms h5clear_open_fail 1 "-m" "-s"  junk.h5)
-  ADD_H5_CMP (h5clr_no_mdc_image_m h5clear_no_mdc_image 0 "-m" orig_h5clear_sec2_v2.h5)
-  ADD_H5_CMP (h5clr_no_mdc_image_ms h5clear_no_mdc_image 0 "-s" "-m" orig_h5clear_sec2_v0.h5)
+  ADD_H5_ERR_CMP (h5clr_open_fail_ms h5clear_open_fail 1 "-m" "-s"  junk.h5)
+  ADD_H5_ERR_CMP (h5clr_no_mdc_image_m h5clear_no_mdc_image 0 "-m" orig_h5clear_sec2_v2.h5)
+  ADD_H5_ERR_CMP (h5clr_no_mdc_image_ms h5clear_no_mdc_image 0 "-s" "-m" orig_h5clear_sec2_v0.h5)
 #
 #
 #
@@ -382,8 +453,8 @@ endif()
 #
 #
 # h5clear_mdc_image.h5 already has cache image removed earlier, verify the expected warning from h5clear:
-  ADD_H5_CMP (h5clr_mdc_image_m h5clear_no_mdc_image 0 "-m" mod_h5clear_mdc_image.h5)
-  ADD_H5_CMP (h5clr_mdc_image_sm h5clear_no_mdc_image 0 "-s" "-m" mod_h5clear_mdc_image2.h5)
+  ADD_H5_ERR_CMP (h5clr_mdc_image_m h5clear_no_mdc_image 0 "-m" mod_h5clear_mdc_image.h5)
+  ADD_H5_ERR_CMP (h5clr_mdc_image_sm h5clear_no_mdc_image 0 "-s" "-m" mod_h5clear_mdc_image2.h5)
 #
 #
 #
@@ -404,7 +475,7 @@ endif()
 # "h5clear -s --increment=0 h5clear_status_noclose.h5"  (clear status_flag, EOA = MAX(EOA, EOF) + 0)
 #                                                       (no output, check exit code)
 # "h5clear --filesize h5clear_status_noclose.h5"        (print EOA/EOF after the last action)
-  ADD_H5_CMP_WITH_COPY (h5clr_open_fail_nc_s 1 h5clear_open_fail h5clear_status_noclose.h5 "--filesize")
+  ADD_H5_ERR_CMP_WITH_COPY (h5clr_open_fail_nc_s 1 h5clear_open_fail h5clear_status_noclose.h5 "--filesize")
   ADD_H5_RETTEST (h5clr_mdc_image_nc "false" "-s" "--increment=0" h5clear_status_noclose.h5)
   ADD_H5_CMP (h5clr_no_mdc_image_nc_m h5clear_status_noclose_after_size 0 "--filesize" h5clear_status_noclose.h5)
 #
diff --git a/tools/test/misc/testfiles/h5clear_missing_file.ddl b/tools/test/misc/testfiles/h5clear_missing_file.ddl
index 13eb2c9..32dd549 100644
--- a/tools/test/misc/testfiles/h5clear_missing_file.ddl
+++ b/tools/test/misc/testfiles/h5clear_missing_file.ddl
@@ -20,4 +20,3 @@ h5clear --increment file_name
 
 h5clear --increment=512 file_name
   Set the EOA to the maximum of (EOA, EOF) + 512 for the file <file_name>.
-h5clear error: missing file name
diff --git a/tools/test/misc/testfiles/h5clear_missing_file.err b/tools/test/misc/testfiles/h5clear_missing_file.err
new file mode 100644
index 0000000..ea21b76
--- /dev/null
+++ b/tools/test/misc/testfiles/h5clear_missing_file.err
@@ -0,0 +1 @@
+h5clear error: missing file name
diff --git a/tools/test/misc/testfiles/h5clear_no_mdc_image.ddl b/tools/test/misc/testfiles/h5clear_no_mdc_image.err
index f5acd71..f5acd71 100644
--- a/tools/test/misc/testfiles/h5clear_no_mdc_image.ddl
+++ b/tools/test/misc/testfiles/h5clear_no_mdc_image.err
diff --git a/tools/test/misc/testfiles/h5clear_open_fail.ddl b/tools/test/misc/testfiles/h5clear_open_fail.err
index 895ecd4..895ecd4 100644
--- a/tools/test/misc/testfiles/h5clear_open_fail.ddl
+++ b/tools/test/misc/testfiles/h5clear_open_fail.err
diff --git a/tools/test/misc/testh5clear.sh.in b/tools/test/misc/testh5clear.sh.in
index 11c2ff9..3f2b32f 100644
--- a/tools/test/misc/testh5clear.sh.in
+++ b/tools/test/misc/testh5clear.sh.in
@@ -62,10 +62,10 @@ test -d $TESTDIR || mkdir -p $TESTDIR
 # copy test files and expected output files from source dirs to test dir
 #
 COPY_TESTFILES="
+$SRC_H5CLEAR_TESTFILES/h5clear_open_fail.err
+$SRC_H5CLEAR_TESTFILES/h5clear_no_mdc_image.err
 $SRC_H5CLEAR_TESTFILES/h5clear_usage.ddl
-$SRC_H5CLEAR_TESTFILES/h5clear_open_fail.ddl
 $SRC_H5CLEAR_TESTFILES/h5clear_missing_file.ddl
-$SRC_H5CLEAR_TESTFILES/h5clear_no_mdc_image.ddl
 $SRC_H5CLEAR_TESTFILES/h5clear_status_noclose_after_size.ddl
 $SRC_H5CLEAR_TESTFILES/h5clear_noclose_before_size.ddl
 $SRC_H5CLEAR_TESTFILES/h5clear_noclose_after_size.ddl
@@ -179,8 +179,9 @@ TOOLTEST_OUT() {
     expected=$5
     # Prepare expected and actual output
     expect="$TESTDIR/$expected"
+    expect_err="$TESTDIR/`basename $expected .ddl`.err"
     actual="$TESTDIR/`basename $expected .ddl`.out"
-    actual_err="$TESTDIR/`basename $expected .ddl`.err"
+    actual_err="$TESTDIR/`basename $expected .ddl`.out.err"
     actual_sav=${actual}-sav
     actual_err_sav=${actual_err}-sav
 
@@ -192,7 +193,6 @@ TOOLTEST_OUT() {
     ) >$actual 2>$actual_err
     cp $actual $actual_sav
     cp $actual_err $actual_err_sav
-    cat $actual_err >> $actual
 
     # Compare output
     COMPARE_OUT $expect $actual
@@ -202,6 +202,38 @@ TOOLTEST_OUT() {
         $RM $actual $actual_err $actual_sav $actual_err_sav
     fi
 }
+# same as TOOLTEST_OUT just compare stderr
+TOOLTEST_ERR() {
+    fname=$1
+    option1=$2
+    option2=$3
+    option3=$4
+    expected=$5
+    # Prepare expected and actual output
+    expect_err="$TESTDIR/$expected"
+    expect="$TESTDIR/`basename $expected .err`.ddl"
+    actual="$TESTDIR/`basename $expected .err`.out"
+    actual_err="$TESTDIR/`basename $expected .err`.out.err"
+    actual_sav=${actual}-sav
+    actual_err_sav=${actual_err}-sav
+
+    # Run test.
+    TESTING $H5CLEAR $option1 $option2 $option3 $option4 $fname
+    (
+        cd $TESTDIR
+        $RUNSERIAL $H5CLEAR_BIN $option1 $option2 $option3 $option4 $fname
+    ) >$actual 2>$actual_err
+    cp $actual $actual_sav
+    cp $actual_err $actual_err_sav
+
+    # Compare output
+    COMPARE_OUT $expect_err $actual_err
+
+    # Clean up output file
+    if test -z "$HDF5_NOCLEANUP"; then
+        $RM $actual $actual_err $actual_sav $actual_err_sav
+    fi
+}
 
 # $1 is the filename to open
 # $2 is the expected return from the open/check program
@@ -274,11 +306,11 @@ TOOLTEST_OUT "" "" "" "" h5clear_usage.ddl
 TOOLTEST_OUT junk.h5 "" "" "" h5clear_usage.ddl
 TOOLTEST_OUT orig_h5clear_sec2_v3.h5 "" "" "" h5clear_usage.ddl
 TOOLTEST_OUT "" -m "" "" h5clear_missing_file.ddl
-TOOLTEST_OUT junk.h5 -s "" "" h5clear_open_fail.ddl
+TOOLTEST_ERR junk.h5 -s "" "" h5clear_open_fail.err
 TOOLTEST_OUT "" -m -s "" h5clear_missing_file.ddl
-TOOLTEST_OUT junk.h5 -m -s "" h5clear_open_fail.ddl
-TOOLTEST_OUT orig_h5clear_sec2_v2.h5 -m "" "" h5clear_no_mdc_image.ddl
-TOOLTEST_OUT orig_h5clear_sec2_v0.h5 -s -m "" h5clear_no_mdc_image.ddl
+TOOLTEST_ERR junk.h5 -m -s "" h5clear_open_fail.err
+TOOLTEST_ERR orig_h5clear_sec2_v2.h5 -m "" "" h5clear_no_mdc_image.err
+TOOLTEST_ERR orig_h5clear_sec2_v0.h5 -s -m "" h5clear_no_mdc_image.err
 #
 #
 # The following are tests to verify the expected exit code from h5clear:
@@ -308,8 +340,8 @@ TOOLTEST h5clear_sec2_v0.h5 -l -m $FAIL
 #
 #
 # h5clear_mdc_image.h5 already has cache image removed earlier, verify the expected warning from h5clear:
-TOOLTEST_OUT mod_h5clear_mdc_image.h5 -m "" "" h5clear_no_mdc_image.ddl
-TOOLTEST_OUT mod_h5clear_mdc_image.h5 -s -m "" h5clear_no_mdc_image.ddl
+TOOLTEST_ERR mod_h5clear_mdc_image.h5 -m "" "" h5clear_no_mdc_image.err
+TOOLTEST_ERR mod_h5clear_mdc_image.h5 -s -m "" h5clear_no_mdc_image.err
 #
 #
 #
@@ -342,16 +374,16 @@ OPEN_CHK h5clear_sec2_v2.h5 $SUCCEED
 #
 #
 #
-# (1) h5clear_status_noclose.h5 
+# (1) h5clear_status_noclose.h5
 # "h5clear --filesize h5clear_status_noclose.h5"        (unable to open the file because status_flag is on)
-# "h5clear -s --increment=0 h5clear_status_noclose.h5"  (clear status_flag, EOA = MAX(EOA, EOF) + 0) 
+# "h5clear -s --increment=0 h5clear_status_noclose.h5"  (clear status_flag, EOA = MAX(EOA, EOF) + 0)
 #                                                       (no output, check exit code)
 # "h5clear --filesize h5clear_status_noclose_user.h5"   (print EOA/EOF after the last action)
-TOOLTEST_OUT h5clear_status_noclose.h5 --filesize "" "" h5clear_open_fail.ddl
+TOOLTEST_ERR h5clear_status_noclose.h5 --filesize "" "" h5clear_open_fail.err
 TOOLTEST h5clear_status_noclose.h5 -s --increment=0 $SUCCEED
 TOOLTEST_OUT h5clear_status_noclose.h5 --filesize "" "" h5clear_status_noclose_after_size.ddl
 #
-# (2) h5clear_fsm_persist_noclose.h5 
+# (2) h5clear_fsm_persist_noclose.h5
 # "h5clear --filesize h5clear_fsm_persist_noclose.h5"       (print EOA/EOF before the next action)
 # "h5clear --increment=0 h5clear_fsm_persist_noclose.h5"    (EOA = MAX(EOA, EOF)) (no output, check exit code)
 # "h5clear --filesize h5clear_fsm_persist_noclose.h5"       (print EOA/EOF after the last action)
@@ -364,7 +396,7 @@ TOOLTEST_OUT h5clear_fsm_persist_noclose.h5 --filesize "" "" h5clear_noclose_aft
 # "h5clear --increment h5clear_fsm_persist_equal.h5"    (EOA = MAX(EOA, EOF) + 1M) (no output, check exit code)
 # "h5clear --filesize h5clear_fsm_persist_equal.h5"     (print EOA/EOF after the last action)
 TOOLTEST_OUT h5clear_fsm_persist_equal.h5 --filesize "" "" h5clear_equal_before_size.ddl
-TOOLTEST h5clear_fsm_persist_equal.h5 --increment "" $SUCCEED 
+TOOLTEST h5clear_fsm_persist_equal.h5 --increment "" $SUCCEED
 TOOLTEST_OUT h5clear_fsm_persist_equal.h5 --filesize "" "" h5clear_equal_after_size.ddl
 #
 # (4) h5clear_fsm_persist_greater.h5
@@ -372,7 +404,7 @@ TOOLTEST_OUT h5clear_fsm_persist_equal.h5 --filesize "" "" h5clear_equal_after_s
 # "h5clear --increment=0 h5clear_fsm_persist_greater.h5"    (EOA = MAX(EOA, EOF) + 0) (no output, check exit code)
 # "h5clear --filesize h5clear_fsm_persist_greater.h5"       (print EOA/EOF after the last action)
 TOOLTEST_OUT h5clear_fsm_persist_greater.h5 --filesize "" "" h5clear_greater_before_size.ddl
-TOOLTEST h5clear_fsm_persist_greater.h5 --increment=0 "" $SUCCEED 
+TOOLTEST h5clear_fsm_persist_greater.h5 --increment=0 "" $SUCCEED
 TOOLTEST_OUT h5clear_fsm_persist_greater.h5 --filesize "" "" h5clear_greater_after_size.ddl
 #
 # (5) h5clear_fsm_persist_less.h5
@@ -380,7 +412,7 @@ TOOLTEST_OUT h5clear_fsm_persist_greater.h5 --filesize "" "" h5clear_greater_aft
 # "h5clear --increment=200 h5clear_fsm_persist_less.h5" (EOA = MAX(EOA, EOF) + 200) (no output, check exit code)
 # "h5clear --filesize h5clear_fsm_persist_less.h5"      (print EOA/EOF after the last action)
 TOOLTEST_OUT h5clear_fsm_persist_less.h5 --filesize "" "" h5clear_less_before_size.ddl
-TOOLTEST h5clear_fsm_persist_less.h5 --increment=200 "" $SUCCEED 
+TOOLTEST h5clear_fsm_persist_less.h5 --increment=200 "" $SUCCEED
 TOOLTEST_OUT h5clear_fsm_persist_less.h5 --filesize "" "" h5clear_less_after_size.ddl
 #
 # (6) h5clear_fsm_persist_user_equal.h5
@@ -388,7 +420,7 @@ TOOLTEST_OUT h5clear_fsm_persist_less.h5 --filesize "" "" h5clear_less_after_siz
 # "h5clear --increment h5clear_fsm_persist_user_equal.h5"   (EOA = MAX(EOA, EOF) + 1M) (no output, check exit code)
 # "h5clear --filesize h5clear_fsm_persist_user_equal.h5"    (print EOA/EOF after the last action)
 TOOLTEST_OUT h5clear_fsm_persist_user_equal.h5 --filesize "" "" h5clear_user_equal_before_size.ddl
-TOOLTEST h5clear_fsm_persist_user_equal.h5 --increment "" $SUCCEED 
+TOOLTEST h5clear_fsm_persist_user_equal.h5 --increment "" $SUCCEED
 TOOLTEST_OUT h5clear_fsm_persist_user_equal.h5 --filesize "" "" h5clear_user_equal_after_size.ddl
 #
 # (7) h5clear_fsm_persist_user_greater.h5
@@ -396,7 +428,7 @@ TOOLTEST_OUT h5clear_fsm_persist_user_equal.h5 --filesize "" "" h5clear_user_equ
 # "h5clear --increment=0 h5clear_fsm_persist_user_greater.h5"   (EOA = MAX(EOA, EOF) + 0) (no output, check exit code)
 # "h5clear --filesize h5clear_fsm_persist_user_greater.h5"      (print EOA/EOF after the last action)
 TOOLTEST_OUT h5clear_fsm_persist_user_greater.h5 --filesize "" "" h5clear_user_greater_before_size.ddl
-TOOLTEST h5clear_fsm_persist_user_greater.h5 --increment=0 "" $SUCCEED 
+TOOLTEST h5clear_fsm_persist_user_greater.h5 --increment=0 "" $SUCCEED
 TOOLTEST_OUT h5clear_fsm_persist_user_greater.h5 --filesize "" "" h5clear_user_greater_after_size.ddl
 #
 # (8) h5clear_fsm_persist_user_less.h5
@@ -404,7 +436,7 @@ TOOLTEST_OUT h5clear_fsm_persist_user_greater.h5 --filesize "" "" h5clear_user_g
 # "h5clear --increment=200 h5clear_fsm_persist_user_less.h5"    (EOA = MAX(EOA, EOF) + 200) (no output, check exit code)
 # "h5clear --filesize h5clear_fsm_persist_user_less.h5"         (print EOA/EOF after the last action)
 TOOLTEST_OUT h5clear_fsm_persist_user_less.h5 --filesize "" "" h5clear_user_less_before_size.ddl
-TOOLTEST h5clear_fsm_persist_user_less.h5 --increment=200 "" $SUCCEED 
+TOOLTEST h5clear_fsm_persist_user_less.h5 --increment=200 "" $SUCCEED
 TOOLTEST_OUT h5clear_fsm_persist_user_less.h5 --filesize "" "" h5clear_user_less_after_size.ddl
 #
 #
diff --git a/tools/testfiles/err_attr_dspace.ddl b/tools/testfiles/err_attr_dspace.ddl
index 6c45322..48ef659 100644
--- a/tools/testfiles/err_attr_dspace.ddl
+++ b/tools/testfiles/err_attr_dspace.ddl
@@ -2,4 +2,3 @@ HDF5 "err_attr_dspace.h5" {
 GROUP "/" {
 }
 }
-h5dump error: error getting attribute information
diff --git a/tools/testfiles/non_existing.ddl b/tools/testfiles/non_existing.ddl
index 4377f8d..4407eae 100644
--- a/tools/testfiles/non_existing.ddl
+++ b/tools/testfiles/non_existing.ddl
@@ -28,4 +28,3 @@ GROUP "/" {
    }
 }
 }
-h5dump error: unable to open file "non_existing.h5"
diff --git a/tools/testfiles/nosuchfile.ls b/tools/testfiles/nosuchfile.ls
index 8c4ee42..e69de29 100644
--- a/tools/testfiles/nosuchfile.ls
+++ b/tools/testfiles/nosuchfile.ls
@@ -1 +0,0 @@
-nosuchfile.h5: unable to open file
diff --git a/tools/testfiles/pbits/tnofilename-with-packed-bits.ddl b/tools/testfiles/pbits/tnofilename-with-packed-bits.ddl
index 0a3beb0..19de76f 100644
--- a/tools/testfiles/pbits/tnofilename-with-packed-bits.ddl
+++ b/tools/testfiles/pbits/tnofilename-with-packed-bits.ddl
@@ -135,4 +135,3 @@ usage: h5dump [OPTIONS] files
 
       h5dump -d /foo -f family fam%05d.h5
 
-h5dump error: missing file name
diff --git a/tools/testfiles/pbits/tpbitsCharLengthExceeded.ddl b/tools/testfiles/pbits/tpbitsCharLengthExceeded.ddl
index b0683a7..b281827 100644
--- a/tools/testfiles/pbits/tpbitsCharLengthExceeded.ddl
+++ b/tools/testfiles/pbits/tpbitsCharLengthExceeded.ddl
@@ -15,4 +15,3 @@ DATASET "/DS08BITS" {
    }
 }
 }
-h5dump error: Packed Bit offset+length value(9) too large. Max is 8
diff --git a/tools/testfiles/pbits/tpbitsCharOffsetExceeded.ddl b/tools/testfiles/pbits/tpbitsCharOffsetExceeded.ddl
index 530fa05..ee56a5c 100644
--- a/tools/testfiles/pbits/tpbitsCharOffsetExceeded.ddl
+++ b/tools/testfiles/pbits/tpbitsCharOffsetExceeded.ddl
@@ -15,4 +15,3 @@ DATASET "/DS08BITS" {
    }
 }
 }
-h5dump error: Packed Bit offset+length value(9) too large. Max is 8
diff --git a/tools/testfiles/pbits/tpbitsIncomplete.ddl b/tools/testfiles/pbits/tpbitsIncomplete.ddl
index b353065..19de76f 100644
--- a/tools/testfiles/pbits/tpbitsIncomplete.ddl
+++ b/tools/testfiles/pbits/tpbitsIncomplete.ddl
@@ -135,4 +135,3 @@ usage: h5dump [OPTIONS] files
 
       h5dump -d /foo -f family fam%05d.h5
 
-h5dump error: Bad mask list(0,2,2,1,0,2,2,)
diff --git a/tools/testfiles/pbits/tpbitsIntLengthExceeded.ddl b/tools/testfiles/pbits/tpbitsIntLengthExceeded.ddl
index 1c919cd..1cba6d5 100644
--- a/tools/testfiles/pbits/tpbitsIntLengthExceeded.ddl
+++ b/tools/testfiles/pbits/tpbitsIntLengthExceeded.ddl
@@ -15,4 +15,3 @@ DATASET "/DS16BITS" {
    }
 }
 }
-h5dump error: Packed Bit offset+length value(17) too large. Max is 16
diff --git a/tools/testfiles/pbits/tpbitsIntOffsetExceeded.ddl b/tools/testfiles/pbits/tpbitsIntOffsetExceeded.ddl
index f3b2a8c..330d61f 100644
--- a/tools/testfiles/pbits/tpbitsIntOffsetExceeded.ddl
+++ b/tools/testfiles/pbits/tpbitsIntOffsetExceeded.ddl
@@ -15,4 +15,3 @@ DATASET "/DS16BITS" {
    }
 }
 }
-h5dump error: Packed Bit offset+length value(17) too large. Max is 16
diff --git a/tools/testfiles/pbits/tpbitsLengthExceeded.ddl b/tools/testfiles/pbits/tpbitsLengthExceeded.ddl
index ffe0da9..19de76f 100644
--- a/tools/testfiles/pbits/tpbitsLengthExceeded.ddl
+++ b/tools/testfiles/pbits/tpbitsLengthExceeded.ddl
@@ -135,4 +135,3 @@ usage: h5dump [OPTIONS] files
 
       h5dump -d /foo -f family fam%05d.h5
 
-h5dump error: Packed Bit offset+length value(65) too large. Max is 64
diff --git a/tools/testfiles/pbits/tpbitsLengthPositive.ddl b/tools/testfiles/pbits/tpbitsLengthPositive.ddl
index 4502143..19de76f 100644
--- a/tools/testfiles/pbits/tpbitsLengthPositive.ddl
+++ b/tools/testfiles/pbits/tpbitsLengthPositive.ddl
@@ -135,4 +135,3 @@ usage: h5dump [OPTIONS] files
 
       h5dump -d /foo -f family fam%05d.h5
 
-h5dump error: Packed Bit length value(0) must be positive.
diff --git a/tools/testfiles/pbits/tpbitsLongLengthExceeded.ddl b/tools/testfiles/pbits/tpbitsLongLengthExceeded.ddl
index 812c300..44ec077 100644
--- a/tools/testfiles/pbits/tpbitsLongLengthExceeded.ddl
+++ b/tools/testfiles/pbits/tpbitsLongLengthExceeded.ddl
@@ -23,4 +23,3 @@ DATASET "/DS32BITS" {
    }
 }
 }
-h5dump error: Packed Bit offset+length value(33) too large. Max is 32
diff --git a/tools/testfiles/pbits/tpbitsLongOffsetExceeded.ddl b/tools/testfiles/pbits/tpbitsLongOffsetExceeded.ddl
index cbea722..c775557 100644
--- a/tools/testfiles/pbits/tpbitsLongOffsetExceeded.ddl
+++ b/tools/testfiles/pbits/tpbitsLongOffsetExceeded.ddl
@@ -23,4 +23,3 @@ DATASET "/DS32BITS" {
    }
 }
 }
-h5dump error: Packed Bit offset+length value(33) too large. Max is 32
diff --git a/tools/testfiles/pbits/tpbitsMaxExceeded.ddl b/tools/testfiles/pbits/tpbitsMaxExceeded.ddl
index 011f6c9..19de76f 100644
--- a/tools/testfiles/pbits/tpbitsMaxExceeded.ddl
+++ b/tools/testfiles/pbits/tpbitsMaxExceeded.ddl
@@ -135,4 +135,3 @@ usage: h5dump [OPTIONS] files
 
       h5dump -d /foo -f family fam%05d.h5
 
-h5dump error: Too many masks requested (max. 8). Mask list(0,1,0,1,1,1,2,1,3,1,4,1,5,1,6,1,7,1)
diff --git a/tools/testfiles/pbits/tpbitsOffsetExceeded.ddl b/tools/testfiles/pbits/tpbitsOffsetExceeded.ddl
index 857fe62..19de76f 100644
--- a/tools/testfiles/pbits/tpbitsOffsetExceeded.ddl
+++ b/tools/testfiles/pbits/tpbitsOffsetExceeded.ddl
@@ -135,4 +135,3 @@ usage: h5dump [OPTIONS] files
 
       h5dump -d /foo -f family fam%05d.h5
 
-h5dump error: Packed Bit offset value(64) must be between 0 and 63
diff --git a/tools/testfiles/pbits/tpbitsOffsetNegative.ddl b/tools/testfiles/pbits/tpbitsOffsetNegative.ddl
index 9ac1160..19de76f 100644
--- a/tools/testfiles/pbits/tpbitsOffsetNegative.ddl
+++ b/tools/testfiles/pbits/tpbitsOffsetNegative.ddl
@@ -135,4 +135,3 @@ usage: h5dump [OPTIONS] files
 
       h5dump -d /foo -f family fam%05d.h5
 
-h5dump error: Bad mask list(-1,1)
diff --git a/tools/testfiles/texceedsubblock.ddl b/tools/testfiles/texceedsubblock.ddl
index 499e0d2..69ec706 100644
--- a/tools/testfiles/texceedsubblock.ddl
+++ b/tools/testfiles/texceedsubblock.ddl
@@ -1,3 +1,2 @@
 HDF5 "taindices.h5" {
 }
-h5dump error: number of block dims (2) exceed dataset dims (1)
diff --git a/tools/testfiles/texceedsubcount.ddl b/tools/testfiles/texceedsubcount.ddl
index 81e8c4a..69ec706 100644
--- a/tools/testfiles/texceedsubcount.ddl
+++ b/tools/testfiles/texceedsubcount.ddl
@@ -1,3 +1,2 @@
 HDF5 "taindices.h5" {
 }
-h5dump error: number of count dims (2) exceed dataset dims (1)
diff --git a/tools/testfiles/texceedsubstart.ddl b/tools/testfiles/texceedsubstart.ddl
index cb535a0..69ec706 100644
--- a/tools/testfiles/texceedsubstart.ddl
+++ b/tools/testfiles/texceedsubstart.ddl
@@ -1,3 +1,2 @@
 HDF5 "taindices.h5" {
 }
-h5dump error: number of start dims (2) exceed dataset dims (1)
diff --git a/tools/testfiles/texceedsubstride.ddl b/tools/testfiles/texceedsubstride.ddl
index bf85997..69ec706 100644
--- a/tools/testfiles/texceedsubstride.ddl
+++ b/tools/testfiles/texceedsubstride.ddl
@@ -1,3 +1,2 @@
 HDF5 "taindices.h5" {
 }
-h5dump error: number of stride dims (2) exceed dataset dims (1)
diff --git a/tools/testfiles/textlinksrc-nodangle-1.ls b/tools/testfiles/textlinksrc-nodangle-1.ls
index 6d1da9e..491f696 100644
--- a/tools/testfiles/textlinksrc-nodangle-1.ls
+++ b/tools/testfiles/textlinksrc-nodangle-1.ls
@@ -56,5 +56,3 @@ usage: h5ls [OPTIONS] file[/OBJECT] [file[/[OBJECT]...]
                       Replaced by --follow-symlinks.
    -e, --errors       Show all HDF5 error reporting
                       Replaced by --enable-error-stack.
-Error: --no-dangling-links must be used along with --follow-symlinks option!
-
diff --git a/tools/testfiles/tgroup-1.ls b/tools/testfiles/tgroup-1.ls
index 069d43e..491f696 100644
--- a/tools/testfiles/tgroup-1.ls
+++ b/tools/testfiles/tgroup-1.ls
@@ -56,5 +56,3 @@ usage: h5ls [OPTIONS] file[/OBJECT] [file[/[OBJECT]...]
                       Replaced by --follow-symlinks.
    -e, --errors       Show all HDF5 error reporting
                       Replaced by --enable-error-stack.
-Error: 'recursive' option not compatible with 'group info' option!
-
diff --git a/tools/testfiles/tstarfile.ddl b/tools/testfiles/tstarfile.ddl
index 87c3f87..1cd87f7 100644
--- a/tools/testfiles/tstarfile.ddl
+++ b/tools/testfiles/tstarfile.ddl
@@ -86,4 +86,3 @@ HDF5-DIAG: Error detected in HDF5 (version (number)) thread (IDs):
   #004: (file name) line (number) in H5L_get_info_cb(): name doesn't exist
     major: Symbol table
     minor: Object not found
-h5dump error: unable to get link info from "Dataset1"