Implement selection I/O with type conversion (#2823)

Initial implementation of selection I/O with type conversion.  Allows
Parallel collective I/O with type conversion, as long as selection I/O
is enabled.

13 files changed, 3282 insertions, 1 deletions

diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index da98f15..c3365b7 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -337,6 +337,7 @@ set (H5_TESTS
     page_buffer
     dtypes
     dsets
+    select_io_dset
     chunk_info # compression lib link
     cmpd_dset
     mdset
diff --git a/test/Makefile.am b/test/Makefile.am
index bad52c8..291907c 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -65,7 +65,7 @@ TEST_PROG= testhdf5 \
            accum hyperslab istore bittests dt_arith page_buffer \
            dtypes dsets chunk_info cmpd_dset mdset cmpd_dtransform filter_fail extend direct_chunk \
            external efc objcopy objcopy_ref links unlink twriteorder big mtime \
-           fillval mount \
+           fillval mount select_io_dset\
            flush1 flush2 app_ref enum set_extent ttsafe enc_dec_plist \
            enc_dec_plist_cross_platform getname vfd ros3 s3comms hdfs ntypes \
            dangle dtransform reserved cross_read freespace mf vds file_image \
diff --git a/test/enc_dec_plist.c b/test/enc_dec_plist.c
index fd4ae5e..5b75178 100644
--- a/test/enc_dec_plist.c
+++ b/test/enc_dec_plist.c
@@ -367,6 +367,12 @@ main(void)
             if ((H5Pset_data_transform(dxpl, c_to_f)) < 0)
                 FAIL_STACK_ERROR;
 
+            if (H5Pset_selection_io(dxpl, H5D_SELECTION_IO_MODE_ON) < 0)
+                FAIL_STACK_ERROR;
+
+            if (H5Pset_modify_write_buf(dxpl, TRUE) < 0)
+                FAIL_STACK_ERROR;
+
             /* Test encoding & decoding property list */
             if (test_encode_decode(dxpl, low, high) < 0)
                 FAIL_PUTS_ERROR("DXPL encoding/decoding failed\n");
diff --git a/test/gen_plist.c b/test/gen_plist.c
index afe8494..5302dc7 100644
--- a/test/gen_plist.c
+++ b/test/gen_plist.c
@@ -183,6 +183,11 @@ main(void)
         assert(ret > 0);
     if ((ret = H5Pset_data_transform(dxpl1, c_to_f)) < 0)
         assert(ret > 0);
+    if ((ret = H5Pset_selection_io(dxpl1, H5D_SELECTION_IO_MODE_ON)) < 0)
+        assert(ret > 0);
+
+    if ((ret = H5Pset_modify_write_buf(dxpl1, TRUE)) < 0)
+        assert(ret > 0);
 
     if ((ret = encode_plist(dxpl1, little_endian, word_length, "testfiles/plist_files/dxpl_")) < 0)
         assert(ret > 0);
diff --git a/test/select_io_dset.c b/test/select_io_dset.c
new file mode 100644
index 0000000..9a1de06
--- /dev/null
+++ b/test/select_io_dset.c
@@ -0,0 +1,3269 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * 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://www.hdfgroup.org/licenses.               *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Programmer:
+ *
+ * Purpose:    Tests selection IO for the dataset interface (H5D)
+ */
+
+#include "testhdf5.h"
+#include "H5srcdir.h"
+
+const char *FILENAME[] = {"select_io", /* 0 */
+                          NULL};
+
+#define FILENAME_BUF_SIZE 1024
+
+/*
+ * Test configurations
+ */
+typedef enum {
+    TEST_NO_TYPE_CONV,           /* no type conversion (null case) */
+    TEST_NO_SIZE_CHANGE_NO_BKG,  /* no size change, no bkg buffer */
+    TEST_LARGER_MEM_NO_BKG,      /* larger memory type, no bkg buffer */
+    TEST_SMALLER_MEM_NO_BKG,     /* smaller memory type, no bkg buffer */
+    TEST_CMPD_WITH_BKG,          /* compound types with bkg buffer */
+    TEST_MULTI_CONV_NO_BKG,      /* multi dataset test 1 */
+    TEST_MULTI_CONV_BKG,         /* multi dataset test 2 */
+    TEST_MULTI_CONV_SIZE_CHANGE, /* multi dataset test 3 */
+    TEST_MULTI_ALL,              /* multi dataset test 4 */
+    TEST_SELECT_NTESTS
+} test_select_config_t;
+
+#define DSET_SELECT_DIM       100
+#define DSET_SELECT_CHUNK_DIM 10
+
+#define MULTI_NUM_DSETS 3
+#define MULTI_MIN_DSETS 3
+#define DSET_NAME_LEN   64
+
+/* Compound type */
+typedef struct s1_t {
+    int a;
+    int b;
+    int c;
+    int d;
+} s1_t;
+
+/*
+ * Variation of s1 with:
+ * --no conversion for 2 member types
+ * --1 larger mem type,
+ * --1 smaller mem type
+ */
+typedef struct s2_t {
+    int   a;
+    long  b;
+    int   c;
+    short d;
+} s2_t;
+
+/* Variation of s1: reverse of s1_t */
+typedef struct s3_t {
+    int d;
+    int c;
+    int b;
+    int a;
+} s3_t;
+
+/* Variations of s1: only 2 members in s1_t */
+typedef struct s4_t {
+    unsigned int b;
+    unsigned int d;
+} s4_t;
+
+/* Defines for test_multi_dsets_all() */
+typedef enum {
+    DSET_WITH_NO_CONV,         /* Dataset with no type conversion */
+    DSET_WITH_CONV_AND_NO_BKG, /* Dataset with type conversion but no background buffer */
+    DSET_WITH_CONV_AND_BKG,    /* Dataset with type conversion and background buffer */
+    DSET_NTTYPES
+} multi_dset_type_t;
+
+/* Test setting A and B */
+#define SETTING_A 1
+#define SETTING_B 2
+
+/* Definitions of the test modes for test_get_no_selection_io_cause() */
+#define TEST_DISABLE_BY_API                    0x001
+#define TEST_DATATYPE_CONVERSION               0x002
+#define TEST_NOT_CONTIGUOUS_OR_CHUNKED_DATASET 0x004
+#define TEST_CONTIGUOUS_SIEVE_BUFFER           0x008
+#define TEST_NO_VECTOR_OR_SELECTION_IO_CB      0x010
+#define TEST_PAGE_BUFFER                       0x020
+#define TEST_DATASET_FILTER                    0x040
+#define TEST_CHUNK_CACHE                       0x080
+#define TEST_TCONV_BUF_TOO_SMALL               0x100
+#define TEST_IN_PLACE_TCONV                    0x200
+
+/*
+ *  Case 1: single dataset read/write, no type conversion (null case)
+ *  --create dataset with H5T_NATIVE_INT
+ *  --write/read dataset with H5T_NATIVE_INT
+ */
+static herr_t
+test_no_type_conv(hid_t fid, unsigned chunked, unsigned dtrans, unsigned mwbuf)
+{
+    int         i;
+    hid_t       did         = H5I_INVALID_HID;
+    hid_t       sid         = H5I_INVALID_HID;
+    hid_t       dcpl        = H5I_INVALID_HID;
+    hid_t       dxpl        = H5I_INVALID_HID;
+    hid_t       ntrans_dxpl = H5I_INVALID_HID;
+    hsize_t     dims[1];
+    hsize_t     cdims[1];
+    int         wbuf[DSET_SELECT_DIM];
+    int         wbuf_bak[DSET_SELECT_DIM];
+    int         trans_wbuf[DSET_SELECT_DIM];
+    int         rbuf[DSET_SELECT_DIM];
+    char        dset_name[DSET_NAME_LEN];
+    const char *expr = "2*x";
+
+    /* Create 1d data space */
+    dims[0] = DSET_SELECT_DIM;
+    if ((sid = H5Screate_simple(1, dims, NULL)) < 0)
+        FAIL_STACK_ERROR;
+    if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (chunked) {
+        cdims[0] = DSET_SELECT_CHUNK_DIM;
+        if (H5Pset_chunk(dcpl, 1, cdims) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    /* Generate dataset name */
+    HDsnprintf(dset_name, sizeof(dset_name), "no_tconv_%s_%s_%s", chunked ? "chunked" : "contig",
+               dtrans ? "xform" : "noxform", mwbuf ? "mwbuf" : "nomwbuf");
+
+    /* Create dataset */
+    if ((did = H5Dcreate2(fid, dset_name, H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Initialize data */
+    for (i = 0; i < DSET_SELECT_DIM; i++) {
+        wbuf[i]       = i;
+        trans_wbuf[i] = 2 * wbuf[i];
+    }
+
+    /* Create dataset transfer property list */
+    if ((dxpl = H5Pcreate(H5P_DATASET_XFER)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (H5Pset_selection_io(dxpl, H5D_SELECTION_IO_MODE_ON) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Set modify write buffer if requested */
+    if (mwbuf)
+        if (H5Pset_modify_write_buf(dxpl, TRUE) < 0)
+            FAIL_STACK_ERROR;
+
+    if ((ntrans_dxpl = H5Pcopy(dxpl)) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Set data transform */
+    if (dtrans)
+        if (H5Pset_data_transform(dxpl, expr) < 0)
+            FAIL_STACK_ERROR;
+
+    /* Copy wbuf if the library will be modifying it */
+    if (mwbuf)
+        HDmemcpy(wbuf_bak, wbuf, sizeof(wbuf));
+
+    /* Write data to the dataset with/without data transform */
+    if (H5Dwrite(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, dxpl, wbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Restore wbuf from backup if the library modified it */
+    if (mwbuf)
+        HDmemcpy(wbuf, wbuf_bak, sizeof(wbuf));
+
+    /* Read data from the dataset without data transform set in dxpl */
+    if (H5Dread(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, ntrans_dxpl, rbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Verify data or transformed data read */
+    for (i = 0; i < DSET_SELECT_DIM; i++)
+        if (rbuf[i] != (dtrans ? trans_wbuf[i] : wbuf[i])) {
+            H5_FAILED();
+            HDprintf("    Read different values than written.\n");
+            HDprintf("    At index %d\n", i);
+            TEST_ERROR;
+        }
+
+    if (dtrans) {
+
+        /* Read the data from the dataset with data transform set in dxpl */
+        if (H5Dread(did, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, dxpl, rbuf) < 0)
+            FAIL_STACK_ERROR;
+
+        /* Verify data read is transformed a second time */
+        for (i = 0; i < DSET_SELECT_DIM; i++)
+            if (rbuf[i] != (2 * trans_wbuf[i])) {
+                H5_FAILED();
+                HDprintf("    Read different values than written.\n");
+                HDprintf("    At index %d\n", i);
+                TEST_ERROR;
+            }
+    }
+
+    if (H5Sclose(sid) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Dclose(did) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(dcpl) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(dxpl) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(ntrans_dxpl) < 0)
+        FAIL_STACK_ERROR;
+
+    PASSED();
+
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY
+    {
+        H5Sclose(sid);
+        H5Dclose(did);
+        H5Pclose(dcpl);
+        H5Pclose(dxpl);
+        H5Pclose(ntrans_dxpl);
+    }
+    H5E_END_TRY;
+
+    return FAIL;
+
+} /* test_no_type_conv() */
+
+/*
+ *  Case 2: single dataset read/write, no size change, no background buffer
+ *  --create dataset with H5T_STD_I32BE
+ *  --write/read dataset with H5T_STD_I32LE
+ *  --read again with H5T_STD_I32BE
+ */
+static herr_t
+test_no_size_change_no_bkg(hid_t fid, unsigned chunked, unsigned mwbuf)
+{
+    int     i;
+    hid_t   did  = H5I_INVALID_HID;
+    hid_t   sid  = H5I_INVALID_HID;
+    hid_t   dcpl = H5I_INVALID_HID;
+    hid_t   dxpl = H5I_INVALID_HID;
+    hsize_t dims[1];
+    hsize_t cdims[1];
+    char   *wbuf     = NULL;
+    char   *wbuf_bak = NULL;
+    char   *rbuf     = NULL;
+    char    dset_name[DSET_NAME_LEN];
+
+    if ((wbuf = (char *)HDmalloc((size_t)(4 * DSET_SELECT_DIM))) == NULL)
+        FAIL_STACK_ERROR;
+    if (mwbuf && (wbuf_bak = (char *)HDmalloc((size_t)(4 * DSET_SELECT_DIM))) == NULL)
+        FAIL_STACK_ERROR;
+    if ((rbuf = (char *)HDmalloc((size_t)(4 * DSET_SELECT_DIM))) == NULL)
+        FAIL_STACK_ERROR;
+
+    /* Create dataset transfer property list */
+    if ((dxpl = H5Pcreate(H5P_DATASET_XFER)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (H5Pset_selection_io(dxpl, H5D_SELECTION_IO_MODE_ON) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Set modify write buffer if requested */
+    if (mwbuf)
+        if (H5Pset_modify_write_buf(dxpl, TRUE) < 0)
+            FAIL_STACK_ERROR;
+
+    /* Create 1d data space */
+    dims[0] = DSET_SELECT_DIM;
+    if ((sid = H5Screate_simple(1, dims, NULL)) < 0)
+        FAIL_STACK_ERROR;
+    if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (chunked) {
+        cdims[0] = DSET_SELECT_CHUNK_DIM;
+        if (H5Pset_chunk(dcpl, 1, cdims) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    /* Generate dataset name */
+    HDsnprintf(dset_name, sizeof(dset_name), "no_size_change_%s_%s", chunked ? "chunked" : "contig",
+               mwbuf ? "mwbuf" : "nomwbuf");
+
+    /* Create 1d dataset */
+    if ((did = H5Dcreate2(fid, dset_name, H5T_STD_I32BE, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Initialize data */
+    for (i = 0; i < DSET_SELECT_DIM; i++) {
+        wbuf[i * 4 + 3] = 0x1;
+        wbuf[i * 4 + 2] = 0x2;
+        wbuf[i * 4 + 1] = 0x3;
+        wbuf[i * 4 + 0] = 0x4;
+    }
+
+    /* Copy wbuf if the library will be modifying it */
+    if (mwbuf)
+        HDmemcpy(wbuf_bak, wbuf, (size_t)(4 * DSET_SELECT_DIM));
+
+    /* Write the data to the dataset with little endian */
+    if (H5Dwrite(did, H5T_STD_I32LE, H5S_ALL, H5S_ALL, dxpl, wbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Restore wbuf from backup if the library modified it */
+    if (mwbuf)
+        HDmemcpy(wbuf, wbuf_bak, (size_t)(4 * DSET_SELECT_DIM));
+
+    /* Read the data from the dataset with little endian */
+    if (H5Dread(did, H5T_STD_I32LE, H5S_ALL, H5S_ALL, dxpl, rbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Verify data read little endian */
+    for (i = 0; i < DSET_SELECT_DIM; i++)
+        if (rbuf[4 * i + 0] != wbuf[4 * i + 0] || rbuf[4 * i + 1] != wbuf[4 * i + 1] ||
+            rbuf[4 * i + 2] != wbuf[4 * i + 2] || rbuf[4 * i + 3] != wbuf[4 * i + 3]) {
+            H5_FAILED();
+            HDprintf("    Read different values than written.\n");
+            HDprintf("    At index %d\n", i);
+            TEST_ERROR;
+        }
+
+    /* Read the data from the dataset with big endian */
+    if (H5Dread(did, H5T_STD_I32BE, H5S_ALL, H5S_ALL, dxpl, rbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Verify data read in big endian */
+    for (i = 0; i < DSET_SELECT_DIM; i++)
+        if (rbuf[4 * i + 0] != wbuf[4 * i + 3] || rbuf[4 * i + 1] != wbuf[4 * i + 2] ||
+            rbuf[4 * i + 2] != wbuf[4 * i + 1] || rbuf[4 * i + 3] != wbuf[4 * i + 0]) {
+            H5_FAILED();
+            HDprintf("    Read different values than written.\n");
+            HDprintf("    At index %d\n", i);
+            TEST_ERROR;
+        }
+
+    if (H5Sclose(sid) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Dclose(did) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(dcpl) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(dxpl) < 0)
+        FAIL_STACK_ERROR;
+
+    HDfree(wbuf);
+    HDfree(wbuf_bak);
+    HDfree(rbuf);
+
+    PASSED();
+
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY
+    {
+        H5Sclose(sid);
+        H5Dclose(did);
+        H5Pclose(dcpl);
+        H5Pclose(dxpl);
+    }
+    H5E_END_TRY;
+
+    if (wbuf)
+        HDfree(wbuf);
+    if (wbuf_bak)
+        HDfree(wbuf_bak);
+    if (wbuf)
+        HDfree(rbuf);
+
+    return FAIL;
+
+} /* test_no_size_change_no_bkg() */
+
+/*
+ *  Case 3: single dataset read/write, larger mem type, no background buffer
+ *  --create dataset with H5T_NATIVE_INT
+ *  --write dataset with H5T_NATIVE_LONG
+ *  --read dataset with H5T_NATIVE_LLONG
+ *
+ */
+static herr_t
+test_larger_mem_type_no_bkg(hid_t fid, unsigned chunked, unsigned dtrans, unsigned mwbuf)
+{
+    int         i;
+    hid_t       did         = H5I_INVALID_HID;
+    hid_t       sid         = H5I_INVALID_HID;
+    hid_t       dcpl        = H5I_INVALID_HID;
+    hid_t       dxpl        = H5I_INVALID_HID;
+    hid_t       ntrans_dxpl = H5I_INVALID_HID;
+    hsize_t     dims[1];
+    hsize_t     cdims[1];
+    long        wbuf[DSET_SELECT_DIM];
+    long        wbuf_bak[DSET_SELECT_DIM];
+    long        trans_wbuf[DSET_SELECT_DIM];
+    long long   rbuf[DSET_SELECT_DIM];
+    char        dset_name[DSET_NAME_LEN];
+    const char *expr = "5 * (10 - x)";
+
+    /* Create 1d data space */
+    dims[0] = DSET_SELECT_DIM;
+    if ((sid = H5Screate_simple(1, dims, NULL)) < 0)
+        FAIL_STACK_ERROR;
+    if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (chunked) {
+        cdims[0] = DSET_SELECT_CHUNK_DIM;
+        if (H5Pset_chunk(dcpl, 1, cdims) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    /* Generate dataset name */
+    HDsnprintf(dset_name, sizeof(dset_name), "larger_no_bkg_%s_%s_%s", chunked ? "chunked" : "contig",
+               dtrans ? "xform" : "noxform", mwbuf ? "mwbuf" : "nomwbuf");
+
+    /* Create dataset */
+    if ((did = H5Dcreate2(fid, dset_name, H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Initialize data */
+    for (i = 0; i < DSET_SELECT_DIM; i++) {
+        wbuf[i]       = i;
+        trans_wbuf[i] = 5 * (10 - wbuf[i]);
+    }
+
+    /* Create dataset transfer property list */
+    if ((dxpl = H5Pcreate(H5P_DATASET_XFER)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (H5Pset_selection_io(dxpl, H5D_SELECTION_IO_MODE_ON) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Set modify write buffer if requested */
+    if (mwbuf)
+        if (H5Pset_modify_write_buf(dxpl, TRUE) < 0)
+            FAIL_STACK_ERROR;
+
+    if ((ntrans_dxpl = H5Pcopy(dxpl)) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Set data transform */
+    if (dtrans)
+        if (H5Pset_data_transform(dxpl, expr) < 0)
+            FAIL_STACK_ERROR;
+
+    /* Copy wbuf if the library will be modifying it */
+    if (mwbuf)
+        HDmemcpy(wbuf_bak, wbuf, sizeof(wbuf));
+
+    /* Write data to the dataset with/without data transform set in dxpl */
+    if (H5Dwrite(did, H5T_NATIVE_LONG, H5S_ALL, H5S_ALL, dxpl, wbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Restore wbuf from backup if the library modified it */
+    if (mwbuf)
+        HDmemcpy(wbuf, wbuf_bak, sizeof(wbuf));
+
+    /* Read the data from the dataset without data transform in dxpl */
+    if (H5Dread(did, H5T_NATIVE_LLONG, H5S_ALL, H5S_ALL, ntrans_dxpl, rbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Verify data or transformed data read */
+    for (i = 0; i < DSET_SELECT_DIM; i++)
+        if (rbuf[i] != (long long)(dtrans ? trans_wbuf[i] : wbuf[i])) {
+            H5_FAILED();
+            HDprintf("    Read different values than written.\n");
+            HDprintf("    At index %d\n", i);
+            TEST_ERROR;
+        }
+
+    if (dtrans) {
+
+        /* Read data from the dataset with data transform set in dxpl */
+        if (H5Dread(did, H5T_NATIVE_LLONG, H5S_ALL, H5S_ALL, dxpl, rbuf) < 0)
+            FAIL_STACK_ERROR;
+
+        /* Verify data read is transformed a second time */
+        for (i = 0; i < DSET_SELECT_DIM; i++)
+            if (rbuf[i] != (long long)(5 * (10 - trans_wbuf[i]))) {
+                H5_FAILED();
+                HDprintf("    Read different values than written.\n");
+                HDprintf("    At index %d\n", i);
+                TEST_ERROR;
+            }
+    }
+
+    if (H5Sclose(sid) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Dclose(did) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(dcpl) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(dxpl) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(ntrans_dxpl) < 0)
+        FAIL_STACK_ERROR;
+
+    PASSED();
+
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY
+    {
+        H5Sclose(sid);
+        H5Dclose(did);
+        H5Pclose(dcpl);
+        H5Pclose(dxpl);
+        H5Pclose(ntrans_dxpl);
+    }
+    H5E_END_TRY;
+
+    return FAIL;
+
+} /* test_larger_mem_type_no_bkg() */
+
+/*
+ *  Case 4: single dataset reader/write, smaller mem type, no background buffer
+ *  --create dataset with H5T_NATIVE_INT
+ *  --write dataset with H5T_NATIVE_SHORT
+ *  --read dataset with H5T_NATIVE_SHORT
+ */
+static herr_t
+test_smaller_mem_type_no_bkg(hid_t fid, unsigned chunked, unsigned dtrans, unsigned mwbuf)
+{
+    int         i;
+    hid_t       did         = H5I_INVALID_HID;
+    hid_t       sid         = H5I_INVALID_HID;
+    hid_t       dcpl        = H5I_INVALID_HID;
+    hid_t       dxpl        = H5I_INVALID_HID;
+    hid_t       ntrans_dxpl = H5I_INVALID_HID;
+    hsize_t     dims[1];
+    hsize_t     cdims[1];
+    short       wbuf[DSET_SELECT_DIM];
+    int         wbuf_bak[DSET_SELECT_DIM];
+    short       trans_wbuf[DSET_SELECT_DIM];
+    short       rbuf[DSET_SELECT_DIM];
+    char        dset_name[DSET_NAME_LEN];
+    const char *expr = "2 * (10 + x)";
+
+    /* Create 1d data space */
+    dims[0] = DSET_SELECT_DIM;
+    if ((sid = H5Screate_simple(1, dims, NULL)) < 0)
+        FAIL_STACK_ERROR;
+    if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (chunked) {
+        cdims[0] = DSET_SELECT_CHUNK_DIM;
+        if (H5Pset_chunk(dcpl, 1, cdims) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    /* Generate dataset name */
+    HDsnprintf(dset_name, sizeof(dset_name), "smaller_no_bkg_%s_%s_%s", chunked ? "chunked" : "contig",
+               dtrans ? "xform" : "noxform", mwbuf ? "mwbuf" : "nomwbuf");
+
+    /* Create 1d chunked dataset with/without data transform */
+    if ((did = H5Dcreate2(fid, dset_name, H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Initialize data */
+    for (i = 0; i < DSET_SELECT_DIM; i++) {
+        wbuf[i]       = (short)i;
+        trans_wbuf[i] = (short)(2 * (10 + wbuf[i]));
+    }
+
+    /* Create dataset transfer property list */
+    if ((dxpl = H5Pcreate(H5P_DATASET_XFER)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (H5Pset_selection_io(dxpl, H5D_SELECTION_IO_MODE_ON) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Set modify write buffer if requested */
+    if (mwbuf)
+        if (H5Pset_modify_write_buf(dxpl, TRUE) < 0)
+            FAIL_STACK_ERROR;
+
+    if ((ntrans_dxpl = H5Pcopy(dxpl)) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Set data transform */
+    if (dtrans) {
+        if (H5Pset_data_transform(dxpl, expr) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    /* Copy wbuf if the library will be modifying it */
+    if (mwbuf)
+        HDmemcpy(wbuf_bak, wbuf, sizeof(wbuf));
+
+    /* Write data to the dataset with/without data transform in dxpl */
+    if (H5Dwrite(did, H5T_NATIVE_SHORT, H5S_ALL, H5S_ALL, dxpl, wbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Restore wbuf from backup if the library modified it */
+    if (mwbuf)
+        HDmemcpy(wbuf, wbuf_bak, sizeof(wbuf));
+
+    /* Read data from the dataset without data transform in dxpl */
+    if (H5Dread(did, H5T_NATIVE_SHORT, H5S_ALL, H5S_ALL, ntrans_dxpl, rbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Verify data or transformed data read */
+    for (i = 0; i < DSET_SELECT_DIM; i++)
+        if (rbuf[i] != (dtrans ? trans_wbuf[i] : wbuf[i])) {
+            H5_FAILED();
+            HDprintf("    Read different values than written.\n");
+            HDprintf("    At index %d\n", i);
+            TEST_ERROR;
+        }
+
+    if (dtrans) {
+
+        /* Read data from the dataset with data transform set in dxpl */
+        if (H5Dread(did, H5T_NATIVE_SHORT, H5S_ALL, H5S_ALL, dxpl, rbuf) < 0)
+            FAIL_STACK_ERROR;
+
+        /* Verify data read is transformed a second time */
+        for (i = 0; i < DSET_SELECT_DIM; i++)
+            if (rbuf[i] != (2 * (10 + trans_wbuf[i]))) {
+                H5_FAILED();
+                HDprintf("    Read different values than written.\n");
+                HDprintf("    At index %d\n", i);
+                TEST_ERROR;
+            }
+    }
+
+    if (H5Sclose(sid) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Dclose(did) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(dcpl) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(dxpl) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(ntrans_dxpl) < 0)
+        FAIL_STACK_ERROR;
+
+    PASSED();
+
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY
+    {
+        H5Sclose(sid);
+        H5Dclose(did);
+        H5Pclose(dcpl);
+        H5Pclose(dxpl);
+        H5Pclose(ntrans_dxpl);
+    }
+    H5E_END_TRY;
+
+    return FAIL;
+
+} /* test_smaller_mem_type_no_bkg() */
+
+/*
+ *  Case 5: single dataset reade/write, compound types with background buffer
+ *
+ *  (a) Initialize compound buffer in memory with unique values
+ *      Write all compound fields to disk
+ *      Verify values read
+ *  (b) Update all fields of the compound type in memory write buffer with new unique values
+ *      Write some but not all all compound fields to disk
+ *      Read the entire compound type
+ *      Verify the fields have the correct (old or new) values
+ *  (c) Update all fields of the compound type in memory read buffer with new unique values
+ *      Read some but not all the compound fields to memory
+ *      Verify the fields have the correct (old, middle  or new) values
+ *  (d) Set up a different compound type which has:
+ *      --no conversion for member types
+ *      --a field with larger mem type
+ *      --a field with smaller mem type
+ *      Write this compound type to disk
+ *      Read the entire compound type
+ *      Verify the values read
+ *
+ */
+static herr_t
+test_cmpd_with_bkg(hid_t fid, unsigned chunked, unsigned mwbuf)
+{
+    int     i;
+    hid_t   did       = H5I_INVALID_HID;
+    hid_t   sid       = H5I_INVALID_HID;
+    hid_t   dcpl      = H5I_INVALID_HID;
+    hid_t   dxpl      = H5I_INVALID_HID;
+    hid_t   s1_tid    = H5I_INVALID_HID;
+    hid_t   s2_tid    = H5I_INVALID_HID;
+    hid_t   ss_ac_tid = H5I_INVALID_HID;
+    hid_t   ss_bc_tid = H5I_INVALID_HID;
+    hsize_t dims[1];
+    hsize_t cdims[1];
+    s1_t   *s1_wbuf     = NULL;
+    s1_t   *s1_wbuf_bak = NULL;
+    s1_t   *s1_rbuf     = NULL;
+    s2_t   *s2_wbuf     = NULL;
+    s2_t   *s2_wbuf_bak = NULL;
+    s2_t   *s2_rbuf     = NULL;
+    char    dset_name[DSET_NAME_LEN];
+
+    /* Create dataset transfer property list */
+    if ((dxpl = H5Pcreate(H5P_DATASET_XFER)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (H5Pset_selection_io(dxpl, H5D_SELECTION_IO_MODE_ON) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Set modify write buffer if requested */
+    if (mwbuf)
+        if (H5Pset_modify_write_buf(dxpl, TRUE) < 0)
+            FAIL_STACK_ERROR;
+
+    /* Allocate buffers for datasets */
+    if (NULL == (s1_wbuf = (s1_t *)HDmalloc(sizeof(s1_t) * DSET_SELECT_DIM)))
+        FAIL_STACK_ERROR;
+    if (mwbuf && NULL == (s1_wbuf_bak = (s1_t *)HDmalloc(sizeof(s1_t) * DSET_SELECT_DIM)))
+        FAIL_STACK_ERROR;
+    if (NULL == (s1_rbuf = (s1_t *)HDmalloc(sizeof(s1_t) * DSET_SELECT_DIM)))
+        FAIL_STACK_ERROR;
+    if (NULL == (s2_wbuf = (s2_t *)HDmalloc(sizeof(s2_t) * DSET_SELECT_DIM)))
+        FAIL_STACK_ERROR;
+    if (mwbuf && NULL == (s2_wbuf_bak = (s2_t *)HDmalloc(sizeof(s2_t) * DSET_SELECT_DIM)))
+        FAIL_STACK_ERROR;
+    if (NULL == (s2_rbuf = (s2_t *)HDmalloc(sizeof(s2_t) * DSET_SELECT_DIM)))
+        FAIL_STACK_ERROR;
+
+    /* Create the memory data type */
+    if ((s1_tid = H5Tcreate(H5T_COMPOUND, sizeof(s1_t))) < 0)
+        FAIL_STACK_ERROR;
+
+    if (H5Tinsert(s1_tid, "a", HOFFSET(s1_t, a), H5T_NATIVE_INT) < 0 ||
+        H5Tinsert(s1_tid, "b", HOFFSET(s1_t, b), H5T_NATIVE_INT) < 0 ||
+        H5Tinsert(s1_tid, "c", HOFFSET(s1_t, c), H5T_NATIVE_INT) < 0 ||
+        H5Tinsert(s1_tid, "d", HOFFSET(s1_t, d), H5T_NATIVE_INT) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Create 1d data space */
+    dims[0] = DSET_SELECT_DIM;
+    if ((sid = H5Screate_simple(1, dims, NULL)) < 0)
+        FAIL_STACK_ERROR;
+    if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (chunked) {
+        cdims[0] = DSET_SELECT_CHUNK_DIM;
+        if (H5Pset_chunk(dcpl, 1, cdims) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    /* Case 5(a) */
+
+    /* Generate dataset name */
+    HDsnprintf(dset_name, sizeof(dset_name), "cmpd_with_bkg_%s_%s", chunked ? "chunked" : "contig",
+               mwbuf ? "mwbuf" : "nomwbuf");
+
+    /* Create 1d dataset */
+    if ((did = H5Dcreate2(fid, dset_name, s1_tid, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Initialize data */
+    for (i = 0; i < DSET_SELECT_DIM; i++) {
+        s1_wbuf[i].a = 4 * i;
+        s1_wbuf[i].b = (4 * i) + 1;
+        s1_wbuf[i].c = (4 * i) + 2;
+        s1_wbuf[i].d = (4 * i) + 3;
+    }
+
+    /* Copy wbuf if the library will be modifying it */
+    if (mwbuf)
+        HDmemcpy(s1_wbuf_bak, s1_wbuf, sizeof(s1_t) * DSET_SELECT_DIM);
+
+    /* Write all the data to the dataset */
+    if (H5Dwrite(did, s1_tid, H5S_ALL, H5S_ALL, dxpl, s1_wbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Restore wbuf from backup if the library modified it */
+    if (mwbuf)
+        HDmemcpy(s1_wbuf, s1_wbuf_bak, sizeof(s1_t) * DSET_SELECT_DIM);
+
+    /* Read all the data from the dataset */
+    if (H5Dread(did, s1_tid, H5S_ALL, H5S_ALL, dxpl, s1_rbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Verify data read */
+    for (i = 0; i < DSET_SELECT_DIM; i++) {
+        if (s1_wbuf[i].a != s1_rbuf[i].a || s1_wbuf[i].b != s1_rbuf[i].b || s1_wbuf[i].c != s1_rbuf[i].c ||
+            s1_wbuf[i].d != s1_rbuf[i].d) {
+            H5_FAILED();
+            HDprintf("    Read different values than written.\n");
+            HDprintf("    At index %d\n", i);
+            TEST_ERROR;
+        }
+    }
+
+    /* Case 5(b) */
+
+    /* Update s1_wbuf with unique values */
+    for (i = 0; i < DSET_SELECT_DIM; i++) {
+        s1_wbuf[i].a = (4 * i) + DSET_SELECT_DIM;
+        s1_wbuf[i].b = (4 * i) + DSET_SELECT_DIM + 1;
+        s1_wbuf[i].c = (4 * i) + DSET_SELECT_DIM + 2;
+        s1_wbuf[i].d = (4 * i) + DSET_SELECT_DIM + 3;
+    }
+
+    /* Create a compound type same size as s1_t */
+    if ((ss_ac_tid = H5Tcreate(H5T_COMPOUND, sizeof(s1_t))) < 0)
+        FAIL_STACK_ERROR;
+
+    /* but contains only subset members of s1_t */
+    if (H5Tinsert(ss_ac_tid, "a", HOFFSET(s1_t, a), H5T_NATIVE_INT) < 0 ||
+        H5Tinsert(ss_ac_tid, "c", HOFFSET(s1_t, c), H5T_NATIVE_INT) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Copy wbuf if the library will be modifying it */
+    if (mwbuf)
+        HDmemcpy(s1_wbuf_bak, s1_wbuf, sizeof(s1_t) * DSET_SELECT_DIM);
+
+    /* Write s1_wbuf to the dataset with only subset members in ss_tid */
+    if (H5Dwrite(did, ss_ac_tid, H5S_ALL, H5S_ALL, dxpl, s1_wbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Restore wbuf from backup if the library modified it */
+    if (mwbuf)
+        HDmemcpy(s1_wbuf, s1_wbuf_bak, sizeof(s1_t) * DSET_SELECT_DIM);
+
+    /* Read the whole compound back */
+    if (H5Dread(did, ss_ac_tid, H5S_ALL, H5S_ALL, dxpl, s1_rbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Verify the compound fields have the correct (old or new) values */
+    for (i = 0; i < DSET_SELECT_DIM; i++) {
+        if (s1_rbuf[i].a != s1_wbuf[i].a || s1_rbuf[i].b != ((4 * i) + 1) || s1_rbuf[i].c != s1_wbuf[i].c ||
+            s1_rbuf[i].d != ((4 * i) + 3)) {
+            H5_FAILED();
+            HDprintf("    Read different values than written.\n");
+            HDprintf("    At index %d\n", i);
+            TEST_ERROR;
+        }
+    }
+
+    /* Case 5(c) */
+
+    /* Update s1_rbuf with new unique values */
+    for (i = 0; i < DSET_SELECT_DIM; i++) {
+        s1_rbuf[i].a = (4 * i) + (2 * DSET_SELECT_DIM);
+        s1_rbuf[i].b = (4 * i) + (2 * DSET_SELECT_DIM) + 1;
+        s1_rbuf[i].c = (4 * i) + (2 * DSET_SELECT_DIM) + 2;
+        s1_rbuf[i].d = (4 * i) + (2 * DSET_SELECT_DIM) + 3;
+    }
+
+    /* Create a compound type same size as s1_t */
+    if ((ss_bc_tid = H5Tcreate(H5T_COMPOUND, sizeof(s1_t))) < 0)
+        FAIL_STACK_ERROR;
+
+    /* but contains only subset members of s1_t */
+    if (H5Tinsert(ss_bc_tid, "b", HOFFSET(s1_t, b), H5T_NATIVE_INT) < 0 ||
+        H5Tinsert(ss_bc_tid, "c", HOFFSET(s1_t, c), H5T_NATIVE_INT) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Read the dataset: will read only what is set in */
+    if (H5Dread(did, ss_bc_tid, H5S_ALL, H5S_ALL, dxpl, s1_rbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Verify data read */
+    for (i = 0; i < DSET_SELECT_DIM; i++) {
+        if (s1_rbuf[i].a != ((4 * i) + (2 * DSET_SELECT_DIM)) || s1_rbuf[i].b != ((4 * i) + 1) ||
+            s1_rbuf[i].c != ((4 * i) + DSET_SELECT_DIM + 2) ||
+            s1_rbuf[i].d != ((4 * i) + (2 * DSET_SELECT_DIM) + 3)) {
+            H5_FAILED();
+            HDprintf("    Read different values than written.\n");
+            HDprintf("    At index %d\n", i);
+            TEST_ERROR;
+        }
+    }
+
+    /* Case 5(d) */
+
+    /* Create s2_t compound type with:
+     * --no conversion for 2 member types,
+     * --1 larger mem type
+     * --1 smaller mem type
+     */
+    if ((s2_tid = H5Tcreate(H5T_COMPOUND, sizeof(s2_t))) < 0)
+        FAIL_STACK_ERROR;
+
+    if (H5Tinsert(s2_tid, "a", HOFFSET(s2_t, a), H5T_NATIVE_INT) < 0 ||
+        H5Tinsert(s2_tid, "b", HOFFSET(s2_t, b), H5T_NATIVE_LONG) < 0 ||
+        H5Tinsert(s2_tid, "c", HOFFSET(s2_t, c), H5T_NATIVE_INT) < 0 ||
+        H5Tinsert(s2_tid, "d", HOFFSET(s2_t, d), H5T_NATIVE_SHORT) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Update s2_wbuf with unique values */
+    for (i = 0; i < DSET_SELECT_DIM; i++) {
+        s2_wbuf[i].a = 8 * i;
+        s2_wbuf[i].b = (long)((8 * i) + 1);
+        s2_wbuf[i].c = (8 * i) + 2;
+        s2_wbuf[i].d = (short)((8 * i) + 3);
+    }
+
+    /* Copy wbuf if the library will be modifying it */
+    if (mwbuf)
+        HDmemcpy(s2_wbuf_bak, s2_wbuf, sizeof(s2_t) * DSET_SELECT_DIM);
+
+    if (H5Dwrite(did, s2_tid, H5S_ALL, H5S_ALL, dxpl, s2_wbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Restore wbuf from backup if the library modified it */
+    if (mwbuf)
+        HDmemcpy(s2_wbuf, s2_wbuf_bak, sizeof(s2_t) * DSET_SELECT_DIM);
+
+    /* Read it back */
+    if (H5Dread(did, s2_tid, H5S_ALL, H5S_ALL, dxpl, s2_rbuf) < 0) {
+        goto error;
+    }
+
+    /* Verify data read */
+    for (i = 0; i < DSET_SELECT_DIM; i++) {
+        if (s2_wbuf[i].a != s2_rbuf[i].a || s2_wbuf[i].b != s2_rbuf[i].b || s2_wbuf[i].c != s2_rbuf[i].c ||
+            s2_wbuf[i].d != s2_rbuf[i].d) {
+            H5_FAILED();
+            HDprintf("    Read different values than written.\n");
+            HDprintf("    At index %d\n", i);
+            TEST_ERROR;
+        }
+    }
+
+    if (H5Sclose(sid) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Tclose(s1_tid) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Tclose(s2_tid) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Tclose(ss_ac_tid) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Tclose(ss_bc_tid) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Dclose(did) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(dcpl) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(dxpl) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Release buffers */
+    HDfree(s1_wbuf);
+    HDfree(s1_wbuf_bak);
+    HDfree(s1_rbuf);
+    HDfree(s2_wbuf);
+    HDfree(s2_wbuf_bak);
+    HDfree(s2_rbuf);
+
+    PASSED();
+
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY
+    {
+        H5Sclose(sid);
+        H5Tclose(s1_tid);
+        H5Tclose(s2_tid);
+        H5Tclose(ss_ac_tid);
+        H5Tclose(ss_bc_tid);
+        H5Dclose(did);
+        H5Pclose(dcpl);
+        H5Pclose(dxpl);
+    }
+    H5E_END_TRY;
+
+    if (s1_wbuf)
+        HDfree(s1_wbuf);
+    if (s1_wbuf_bak)
+        HDfree(s1_wbuf_bak);
+    if (s1_rbuf)
+        HDfree(s1_rbuf);
+    if (s2_wbuf)
+        HDfree(s2_wbuf);
+    if (s2_wbuf_bak)
+        HDfree(s2_wbuf_bak);
+    if (s2_rbuf)
+        HDfree(s2_rbuf);
+    return FAIL;
+
+} /* test_cmpd_with_bkg() */
+
+/*
+ *  Test 1 for multi-dataset:
+ *  --Datasets with/without type conversion+smaller/larger mem type+no background buffer
+ *
+ *  Create datasets: randomized H5T_NATIVE_INT or H5T_NATIVE_LONG
+ *
+ *  Case a--setting for multi write/read to ndsets:
+ *    Datatype for all datasets: H5T_NATIVE_INT
+ *
+ *  Case b--setting for multi write/read to ndsets:
+ *    Datatype for all datasets: H5T_NATIVE_LONG
+ */
+static herr_t
+test_multi_dsets_no_bkg(hid_t fid, unsigned chunked, unsigned dtrans, unsigned mwbuf)
+{
+    size_t  ndsets;
+    int     i, j;
+    hid_t   dcpl        = H5I_INVALID_HID;
+    hid_t   dxpl        = H5I_INVALID_HID;
+    hid_t   ntrans_dxpl = H5I_INVALID_HID;
+    hsize_t dims[1];
+    hsize_t cdims[1];
+
+    hid_t file_sids[MULTI_NUM_DSETS];
+    hid_t mem_sids[MULTI_NUM_DSETS];
+    hid_t mem_tids[MULTI_NUM_DSETS];
+
+    char  dset_names[MULTI_NUM_DSETS][DSET_NAME_LEN];
+    hid_t dset_dids[MULTI_NUM_DSETS];
+
+    size_t buf_size;
+    int   *total_wbuf        = NULL;
+    int   *total_wbuf_bak    = NULL;
+    int   *total_trans_wbuf  = NULL;
+    int   *total_rbuf        = NULL;
+    long  *total_lwbuf       = NULL;
+    long  *total_lwbuf_bak   = NULL;
+    long  *total_trans_lwbuf = NULL;
+    long  *total_lrbuf       = NULL;
+
+    int *wbufi[MULTI_NUM_DSETS];
+    int *trans_wbufi[MULTI_NUM_DSETS];
+    int *rbufi[MULTI_NUM_DSETS];
+
+    long *lwbufi[MULTI_NUM_DSETS];
+    long *trans_lwbufi[MULTI_NUM_DSETS];
+    long *lrbufi[MULTI_NUM_DSETS];
+
+    const void *wbufs[MULTI_NUM_DSETS];
+    void       *rbufs[MULTI_NUM_DSETS];
+    const char *expr = "2*x";
+
+    ndsets = MAX(MULTI_MIN_DSETS, MULTI_NUM_DSETS);
+
+    dims[0] = DSET_SELECT_DIM;
+
+    if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (chunked) {
+        cdims[0] = DSET_SELECT_CHUNK_DIM;
+        if (H5Pset_chunk(dcpl, 1, cdims) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    /* Create dataset transfer property list */
+    if ((dxpl = H5Pcreate(H5P_DATASET_XFER)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (H5Pset_selection_io(dxpl, H5D_SELECTION_IO_MODE_ON) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Set modify write buffer if requested */
+    if (mwbuf)
+        if (H5Pset_modify_write_buf(dxpl, TRUE) < 0)
+            FAIL_STACK_ERROR;
+
+    if ((ntrans_dxpl = H5Pcopy(dxpl)) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Set data transform */
+    if (dtrans)
+        if (H5Pset_data_transform(dxpl, expr) < 0)
+            FAIL_STACK_ERROR;
+
+    /* Set up file space ids, mem space ids, and dataset ids */
+    for (i = 0; i < (int)ndsets; i++) {
+        if ((file_sids[i] = H5Screate_simple(1, dims, NULL)) < 0)
+            FAIL_STACK_ERROR;
+
+        if ((mem_sids[i] = H5Screate_simple(1, dims, NULL)) < 0)
+            FAIL_STACK_ERROR;
+
+        /* Generate dataset name */
+        HDsnprintf(dset_names[i], sizeof(dset_names[i]), "multi_dset%d_%s_%s_%s", i,
+                   chunked ? "chunked" : "contig", dtrans ? "xform" : "noxform", mwbuf ? "mwbuf" : "nomwbuf");
+
+        /* Create ith dataset */
+        if ((dset_dids[i] =
+                 H5Dcreate2(fid, dset_names[i], ((HDrandom() % 2) ? H5T_NATIVE_LONG : H5T_NATIVE_INT),
+                            file_sids[i], H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    buf_size = ndsets * DSET_SELECT_DIM * sizeof(int);
+
+    /* Allocate buffers for all datasets */
+    if (NULL == (total_wbuf = (int *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+    if (mwbuf && NULL == (total_wbuf_bak = (int *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+    if (NULL == (total_trans_wbuf = (int *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+    if (NULL == (total_rbuf = (int *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+
+    buf_size = ndsets * DSET_SELECT_DIM * sizeof(long);
+
+    if (NULL == (total_lwbuf = (long *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+    if (mwbuf && NULL == (total_lwbuf_bak = (long *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+    if (NULL == (total_trans_lwbuf = (long *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+    if (NULL == (total_lrbuf = (long *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+
+    /* Initialize buffer indices */
+    for (i = 0; i < (int)ndsets; i++) {
+        wbufi[i]       = total_wbuf + (i * DSET_SELECT_DIM);
+        trans_wbufi[i] = total_trans_wbuf + (i * DSET_SELECT_DIM);
+        rbufi[i]       = total_rbuf + (i * DSET_SELECT_DIM);
+
+        wbufs[i] = wbufi[i];
+        rbufs[i] = rbufi[i];
+    }
+
+    /* Initialize the buffer data */
+    for (i = 0; i < (int)ndsets; i++)
+        for (j = 0; j < DSET_SELECT_DIM; j++) {
+            wbufi[i][j]       = (int)j;
+            trans_wbufi[i][j] = 2 * wbufi[i][j];
+        }
+
+    /* Case a */
+
+    /* Datatype setting for multi write/read */
+    for (i = 0; i < (int)ndsets; i++)
+        mem_tids[i] = H5T_NATIVE_INT;
+
+    /* Copy wbuf if the library will be modifying it */
+    if (mwbuf)
+        HDmemcpy(total_wbuf_bak, total_wbuf, ndsets * DSET_SELECT_DIM * sizeof(int));
+
+    /* Write data to the dataset with/without data transform */
+    if (H5Dwrite_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, wbufs) < 0)
+        TEST_ERROR;
+
+    /* Restore wbuf from backup if the library modified it */
+    if (mwbuf)
+        HDmemcpy(total_wbuf, total_wbuf_bak, ndsets * DSET_SELECT_DIM * sizeof(int));
+
+    /* Read data from the dataset (if dtrans, without data transform set in dxpl) */
+    if (H5Dread_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, ntrans_dxpl, rbufs) < 0)
+        TEST_ERROR;
+
+    /* Verify */
+    for (i = 0; i < (int)ndsets; i++)
+        for (j = 0; j < DSET_SELECT_DIM; j++)
+            if (rbufi[i][j] != (dtrans ? trans_wbufi[i][j] : wbufi[i][j])) {
+                H5_FAILED();
+                HDprintf("    Read different values than written.\n");
+                HDprintf("    For dset %d at index %d\n", i, j);
+                TEST_ERROR;
+            }
+
+    if (dtrans) {
+
+        /* Read the data from the dataset with data transform set in dxpl */
+        if (H5Dread_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, rbufs) < 0)
+            TEST_ERROR;
+
+        /* Verify */
+        for (i = 0; i < (int)ndsets; i++)
+            for (j = 0; j < DSET_SELECT_DIM; j++)
+                if (rbufi[i][j] != (2 * trans_wbufi[i][j])) {
+                    H5_FAILED();
+                    HDprintf("    Read different values than written.\n");
+                    HDprintf("    For dset %d at index %d\n", i, j);
+                    TEST_ERROR;
+                }
+    }
+
+    /* Case b */
+
+    /* Datatype setting for multi write/read */
+    for (i = 0; i < (int)ndsets; i++)
+        mem_tids[i] = H5T_NATIVE_LONG;
+
+    /* Initialize buffer indices */
+    for (i = 0; i < (int)ndsets; i++) {
+        lwbufi[i]       = total_lwbuf + (i * DSET_SELECT_DIM);
+        trans_lwbufi[i] = total_trans_lwbuf + (i * DSET_SELECT_DIM);
+        lrbufi[i]       = total_lrbuf + (i * DSET_SELECT_DIM);
+        wbufs[i]        = lwbufi[i];
+        rbufs[i]        = lrbufi[i];
+    }
+
+    /* Initialize the buffer data */
+    for (i = 0; i < (int)ndsets; i++)
+        for (j = 0; j < DSET_SELECT_DIM; j++) {
+            lwbufi[i][j]       = (long)j + DSET_SELECT_DIM;
+            trans_lwbufi[i][j] = 2 * lwbufi[i][j];
+        }
+
+    /* Copy wbuf if the library will be modifying it */
+    if (mwbuf)
+        HDmemcpy(total_lwbuf_bak, total_lwbuf, ndsets * DSET_SELECT_DIM * sizeof(long));
+
+    /* Write data to the dataset with/without data transform */
+    if (H5Dwrite_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, wbufs) < 0)
+        TEST_ERROR;
+
+    /* Restore wbuf from backup if the library modified it */
+    if (mwbuf)
+        HDmemcpy(total_lwbuf, total_lwbuf_bak, ndsets * DSET_SELECT_DIM * sizeof(long));
+
+    /* Read data from the dataset (if dtrans, with data transform again in dxpl) */
+    if (H5Dread_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, rbufs) < 0)
+        TEST_ERROR;
+
+    for (i = 0; i < (int)ndsets; i++) {
+        for (j = 0; j < DSET_SELECT_DIM; j++) {
+            if (lrbufi[i][j] != (dtrans ? (2 * trans_lwbufi[i][j]) : lwbufi[i][j])) {
+                H5_FAILED();
+                HDprintf("    Read different values than written.\n");
+                HDprintf("    For dset %d at index %d\n", i, j);
+                TEST_ERROR;
+            }
+        }
+    }
+
+    if (H5Pclose(dcpl) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(dxpl) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(ntrans_dxpl) < 0)
+        FAIL_STACK_ERROR;
+
+    for (i = 0; i < (int)ndsets; i++) {
+        if (H5Sclose(file_sids[i]) < 0)
+            FAIL_STACK_ERROR;
+        if (H5Sclose(mem_sids[i]) < 0)
+            FAIL_STACK_ERROR;
+        if (H5Dclose(dset_dids[i]) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    HDfree(total_wbuf);
+    HDfree(total_wbuf_bak);
+    HDfree(total_rbuf);
+    HDfree(total_trans_wbuf);
+    HDfree(total_lwbuf);
+    HDfree(total_lwbuf_bak);
+    HDfree(total_lrbuf);
+    HDfree(total_trans_lwbuf);
+
+    PASSED();
+
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY
+    H5Pclose(dcpl);
+    H5Pclose(dxpl);
+    H5Pclose(ntrans_dxpl);
+    for (i = 0; i < (int)ndsets; i++) {
+        H5Sclose(file_sids[i]);
+        H5Sclose(mem_sids[i]);
+        H5Dclose(dset_dids[i]);
+    }
+    H5E_END_TRY;
+
+    if (total_wbuf)
+        HDfree(total_wbuf);
+    if (total_wbuf_bak)
+        HDfree(total_wbuf_bak);
+    if (total_trans_wbuf)
+        HDfree(total_trans_wbuf);
+    if (total_rbuf)
+        HDfree(total_rbuf);
+    if (total_lwbuf)
+        HDfree(total_lwbuf);
+    if (total_lwbuf_bak)
+        HDfree(total_lwbuf_bak);
+    if (total_lrbuf)
+        HDfree(total_lrbuf);
+    if (total_trans_lwbuf)
+        HDfree(total_lrbuf);
+
+    return FAIL;
+
+} /* test_multi_dsets_no_bkg() */
+
+/*
+ * Test 2 for multi-dataset:
+ *
+ *   Datasets with compound types+background buffer
+ *
+ *   Create datasets with the same compound type
+ *   (a) Initialize compound buffer in memory with unique values
+ *       All datasets:
+ *       --Write all compound fields to disk
+ *       --Read the entire compound type for all datasets
+ *       --Verify values read
+ *   (b) Update all fields of the compound type in memory write buffer with new unique values
+ *       dset0:
+ *       --Write some but not all all compound fields to disk
+ *       --Read and verify the fields have the correct (old(a) or new) values
+ *       Remaining datasets:
+ *       --Untouched
+ *       --Read and verify the fields have the correct old(a) values
+ *   (c) Update all fields of the compound type in memory read buffer with new unique values
+ *       Randomized <mm> dataset:
+ *       --Read some but not all the compound fields to memory
+ *       --Verify the fields have the correct (old(a) or new) values
+ *       dset0:
+ *       --Untouched
+ *       --Read and verify the fields have the correct (old(a) or middle(b)) values
+ *       Remaining datasets:
+ *       --Untouched
+ *       --Read and verify the fields have the correct old(a) values
+ *  (d)  Set up a different compound type which has:
+ *      --no type conversion for 2 member types
+ *      --a field with larger mem type
+ *      --a field with smaller mem type
+ *      All datasets:
+ *      --Write the compound fields to disk
+ *      --Read the entire compound type
+ *      --Verify values read
+ */
+static herr_t
+test_multi_dsets_cmpd_with_bkg(hid_t fid, unsigned chunked, unsigned mwbuf)
+{
+    size_t  ndsets;
+    int     i, j, mm;
+    hid_t   dcpl = H5I_INVALID_HID;
+    hid_t   dxpl = H5I_INVALID_HID;
+    hsize_t dims[1];
+    hsize_t cdims[1];
+
+    hid_t file_sids[MULTI_NUM_DSETS];
+    hid_t mem_sids[MULTI_NUM_DSETS];
+    hid_t mem_tids[MULTI_NUM_DSETS];
+
+    hid_t s1_tid    = H5I_INVALID_HID;
+    hid_t ss_ac_tid = H5I_INVALID_HID;
+    hid_t ss_bc_tid = H5I_INVALID_HID;
+    hid_t s2_tid    = H5I_INVALID_HID;
+
+    char  dset_names[MULTI_NUM_DSETS][DSET_NAME_LEN];
+    hid_t dset_dids[MULTI_NUM_DSETS];
+
+    size_t buf_size;
+    size_t s2_buf_size;
+
+    s1_t *total_wbuf     = NULL;
+    s1_t *total_wbuf_bak = NULL;
+    s1_t *total_rbuf     = NULL;
+
+    s2_t *s2_total_wbuf     = NULL;
+    s2_t *s2_total_wbuf_bak = NULL;
+    s2_t *s2_total_rbuf     = NULL;
+
+    s1_t *wbufi[MULTI_NUM_DSETS];
+    s1_t *rbufi[MULTI_NUM_DSETS];
+
+    s2_t *s2_wbufi[MULTI_NUM_DSETS];
+    s2_t *s2_rbufi[MULTI_NUM_DSETS];
+
+    const void *wbufs[MULTI_NUM_DSETS];
+    void       *rbufs[MULTI_NUM_DSETS];
+
+    ndsets = MAX(MULTI_MIN_DSETS, MULTI_NUM_DSETS);
+
+    /* Create dataset transfer property list */
+    if ((dxpl = H5Pcreate(H5P_DATASET_XFER)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (H5Pset_selection_io(dxpl, H5D_SELECTION_IO_MODE_ON) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Set modify write buffer if requested */
+    if (mwbuf)
+        if (H5Pset_modify_write_buf(dxpl, TRUE) < 0)
+            FAIL_STACK_ERROR;
+
+    dims[0] = DSET_SELECT_DIM;
+    if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (chunked) {
+        cdims[0] = DSET_SELECT_CHUNK_DIM;
+        if (H5Pset_chunk(dcpl, 1, cdims) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    /* Create the memory data type */
+    if ((s1_tid = H5Tcreate(H5T_COMPOUND, sizeof(s1_t))) < 0)
+        FAIL_STACK_ERROR;
+
+    if (H5Tinsert(s1_tid, "a", HOFFSET(s1_t, a), H5T_NATIVE_INT) < 0 ||
+        H5Tinsert(s1_tid, "b", HOFFSET(s1_t, b), H5T_NATIVE_INT) < 0 ||
+        H5Tinsert(s1_tid, "c", HOFFSET(s1_t, c), H5T_NATIVE_INT) < 0 ||
+        H5Tinsert(s1_tid, "d", HOFFSET(s1_t, d), H5T_NATIVE_INT) < 0)
+        FAIL_STACK_ERROR;
+
+    for (i = 0; i < (int)ndsets; i++) {
+        if ((file_sids[i] = H5Screate_simple(1, dims, NULL)) < 0)
+            FAIL_STACK_ERROR;
+        if ((mem_sids[i] = H5Screate_simple(1, dims, NULL)) < 0)
+            FAIL_STACK_ERROR;
+
+        /* Generate dataset name */
+        HDsnprintf(dset_names[i], sizeof(dset_names[i]), "multi_cmpd_dset%d_%s_%s", i,
+                   chunked ? "chunked" : "contig", mwbuf ? "mwbuf" : "nomwbuf");
+
+        /* Create ith dataset */
+        if ((dset_dids[i] =
+                 H5Dcreate2(fid, dset_names[i], s1_tid, file_sids[i], H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    buf_size    = ndsets * DSET_SELECT_DIM * sizeof(s1_t);
+    s2_buf_size = ndsets * DSET_SELECT_DIM * sizeof(s2_t);
+
+    /* Allocate buffers */
+    if (NULL == (total_wbuf = (s1_t *)HDmalloc(buf_size)))
+        TEST_ERROR;
+    if (mwbuf && NULL == (total_wbuf_bak = (s1_t *)HDmalloc(buf_size)))
+        TEST_ERROR;
+    if (NULL == (total_rbuf = (s1_t *)HDmalloc(buf_size)))
+        TEST_ERROR;
+
+    if (NULL == (s2_total_wbuf = (s2_t *)HDmalloc(s2_buf_size)))
+        TEST_ERROR;
+    if (mwbuf && NULL == (s2_total_wbuf_bak = (s2_t *)HDmalloc(s2_buf_size)))
+        TEST_ERROR;
+    if (NULL == (s2_total_rbuf = (s2_t *)HDmalloc(s2_buf_size)))
+        TEST_ERROR;
+
+    /* Initialize buffer indices */
+    for (i = 0; i < (int)ndsets; i++) {
+        wbufi[i] = total_wbuf + (i * DSET_SELECT_DIM);
+        rbufi[i] = total_rbuf + (i * DSET_SELECT_DIM);
+
+        wbufs[i] = wbufi[i];
+        rbufs[i] = rbufi[i];
+    }
+
+    /* Case a */
+
+    /* Initialize the buffer data for all the datasets */
+    for (i = 0; i < (int)ndsets; i++)
+        for (j = 0; j < DSET_SELECT_DIM; j++) {
+            wbufi[i][j].a = (4 * j);
+            wbufi[i][j].b = (4 * j) + 1;
+            wbufi[i][j].c = (4 * j) + 2;
+            wbufi[i][j].d = (4 * j) + 3;
+        }
+
+    /* Datatype setting for multi write */
+    for (i = 0; i < (int)ndsets; i++)
+        mem_tids[i] = s1_tid;
+
+    /* Copy wbuf if the library will be modifying it */
+    if (mwbuf)
+        HDmemcpy(total_wbuf_bak, total_wbuf, buf_size);
+
+    if (H5Dwrite_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, wbufs) < 0)
+        TEST_ERROR;
+
+    /* Restore wbuf from backup if the library modified it */
+    if (mwbuf)
+        HDmemcpy(total_wbuf, total_wbuf_bak, buf_size);
+
+    if (H5Dread_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, rbufs) < 0)
+        TEST_ERROR;
+
+    /* Verify data read */
+    for (i = 0; i < (int)ndsets; i++)
+        for (j = 0; j < DSET_SELECT_DIM; j++) {
+            if (wbufi[i][j].a != rbufi[i][j].a || wbufi[i][j].b != rbufi[i][j].b ||
+                wbufi[i][j].c != rbufi[i][j].c || wbufi[i][j].d != rbufi[i][j].d) {
+                H5_FAILED();
+                HDprintf("    Read different values than written.\n");
+                HDprintf("    For dset %d at index %d\n", i, j);
+                TEST_ERROR;
+            }
+        }
+
+    /* Case b */
+
+    /* Update data in wbufi for dset0 with unique values */
+    for (j = 0; j < DSET_SELECT_DIM; j++) {
+        wbufi[0][j].a = (4 * j) + DSET_SELECT_DIM;
+        wbufi[0][j].b = (4 * j) + DSET_SELECT_DIM + 1;
+        wbufi[0][j].c = (4 * j) + DSET_SELECT_DIM + 2;
+        wbufi[0][j].d = (4 * j) + DSET_SELECT_DIM + 3;
+    }
+
+    /* Create a compound type same size as s1_t */
+    if ((ss_ac_tid = H5Tcreate(H5T_COMPOUND, sizeof(s1_t))) < 0)
+        FAIL_STACK_ERROR;
+
+    /* but contains only subset members of s1_t */
+    if (H5Tinsert(ss_ac_tid, "a", HOFFSET(s1_t, a), H5T_NATIVE_INT) < 0 ||
+        H5Tinsert(ss_ac_tid, "c", HOFFSET(s1_t, c), H5T_NATIVE_INT) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Untouched memory and file spaces for other datasets */
+    for (i = 0; i < (int)ndsets; i++) {
+        if (i == 0)
+            continue;
+
+        if (H5Sselect_none(mem_sids[i]) < 0)
+            TEST_ERROR;
+        if (H5Sselect_none(file_sids[i]) < 0)
+            TEST_ERROR;
+    }
+
+    /* Datatype setting for write to dset0 */
+    mem_tids[0] = ss_ac_tid;
+
+    /* Copy wbuf if the library will be modifying it */
+    if (mwbuf)
+        HDmemcpy(total_wbuf_bak, total_wbuf, buf_size);
+
+    if (H5Dwrite_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, wbufs) < 0)
+        TEST_ERROR;
+
+    /* Restore wbuf from backup if the library modified it */
+    if (mwbuf)
+        HDmemcpy(total_wbuf, total_wbuf_bak, buf_size);
+
+    if (H5Dread_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, rbufs) < 0)
+        TEST_ERROR;
+
+    /* Verify data read */
+    for (i = 0; i < (int)ndsets; i++)
+        for (j = 0; j < DSET_SELECT_DIM; j++)
+            if (i == 0) { /* dset0 */
+                if (wbufi[i][j].a != rbufi[i][j].a || ((4 * (int)j) + 1) != rbufi[i][j].b ||
+                    wbufi[i][j].c != rbufi[i][j].c || ((4 * (int)j) + 3) != rbufi[i][j].d) {
+                    H5_FAILED();
+                    HDprintf("    Read different values than written.\n");
+                    HDprintf("    For dset %d at index %d\n", i, j);
+                    TEST_ERROR;
+                }
+            }
+            else { /* other datasets */
+                for (j = 0; j < DSET_SELECT_DIM; j++)
+                    if ((4 * (int)j) != rbufi[i][j].a || ((4 * (int)j) + 1) != rbufi[i][j].b ||
+                        ((4 * (int)j) + 2) != rbufi[i][j].c || ((4 * (int)j) + 3) != rbufi[i][j].d) {
+                        H5_FAILED();
+                        HDprintf("    Read different values than written.\n");
+                        HDprintf("    For dset %d at index %d\n", i, j);
+                        TEST_ERROR;
+                    }
+            }
+
+    /* Case c */
+    mm = HDrandom() % (int)ndsets;
+    if (!mm)
+        mm++;
+
+    /* Update data in rbufi for dset1 with new unique values */
+    for (j = 0; j < DSET_SELECT_DIM; j++) {
+        rbufi[mm][j].a = (4 * j) + (2 * DSET_SELECT_DIM);
+        rbufi[mm][j].b = (4 * j) + (2 * DSET_SELECT_DIM) + 1;
+        rbufi[mm][j].c = (4 * j) + (2 * DSET_SELECT_DIM) + 2;
+        rbufi[mm][j].d = (4 * j) + (2 * DSET_SELECT_DIM) + 3;
+    }
+
+    /* Create a compound type same size as s1_t */
+    if ((ss_bc_tid = H5Tcreate(H5T_COMPOUND, sizeof(s1_t))) < 0)
+        FAIL_STACK_ERROR;
+
+    /* but contains only subset members of s1_t */
+    if (H5Tinsert(ss_bc_tid, "b", HOFFSET(s1_t, b), H5T_NATIVE_INT) < 0 ||
+        H5Tinsert(ss_bc_tid, "c", HOFFSET(s1_t, c), H5T_NATIVE_INT) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Reset memory and file space for <mm> dataset */
+    if (H5Sselect_all(mem_sids[mm]) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Sselect_all(file_sids[mm]) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Untouched memory and file space for other datasets */
+    for (i = 0; i < (int)ndsets; i++) {
+        if (i == 0 || i == mm)
+            continue;
+        if (H5Sselect_none(mem_sids[i]) < 0)
+            TEST_ERROR;
+        if (H5Sselect_none(file_sids[i]) < 0)
+            TEST_ERROR;
+    }
+
+    /* Datatype setting for read from <mm> dataset */
+    mem_tids[mm] = ss_bc_tid;
+
+    if (H5Dread_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, rbufs) < 0)
+        TEST_ERROR;
+
+    /* Verify data read */
+    /* dset0 */
+    for (j = 0; j < DSET_SELECT_DIM; j++)
+        if (wbufi[0][j].a != rbufi[0][j].a || ((4 * (int)j) + 1) != rbufi[0][j].b ||
+            wbufi[0][j].c != rbufi[0][j].c || ((4 * (int)j) + 3) != rbufi[0][j].d) {
+            H5_FAILED();
+            HDprintf("    Read different values than written.\n");
+            HDprintf("    For dset0 at index %d\n", j);
+            TEST_ERROR;
+        }
+
+    /* <mm> dset */
+    for (j = 0; j < DSET_SELECT_DIM; j++)
+        if (rbufi[mm][j].a != ((4 * (int)j) + (2 * DSET_SELECT_DIM)) ||
+            rbufi[mm][j].b != ((4 * (int)j) + 1) || rbufi[mm][j].c != ((4 * (int)j) + 2) ||
+            rbufi[mm][j].d != ((4 * (int)j) + (2 * DSET_SELECT_DIM) + 3)) {
+            H5_FAILED();
+            HDprintf("    Read different values than written.\n");
+            HDprintf("    For dset1 at index %d\n", j);
+            TEST_ERROR;
+        }
+
+    /* other datasets */
+    for (i = 0; i < (int)ndsets; i++) {
+        if (i == 0 || i == mm)
+            continue;
+
+        for (j = 0; j < DSET_SELECT_DIM; j++)
+            if (rbufi[i][j].a != (4 * (int)j) || rbufi[i][j].b != ((4 * (int)j) + 1) ||
+                rbufi[i][j].c != ((4 * (int)j) + 2) || rbufi[i][j].d != ((4 * (int)j) + 3)) {
+                H5_FAILED();
+                HDprintf("    Read different values than written.\n");
+                HDprintf("    For dset %d at index %d\n", i, j);
+                TEST_ERROR;
+            }
+    }
+
+    /* Case d */
+
+    /* Create s2_t compound type with:
+     * --no conversion for 2 member types,
+     * --1 larger mem type
+     * --1 smaller mem type
+     */
+    if ((s2_tid = H5Tcreate(H5T_COMPOUND, sizeof(s2_t))) < 0)
+        FAIL_STACK_ERROR;
+
+    if (H5Tinsert(s2_tid, "a", HOFFSET(s2_t, a), H5T_NATIVE_INT) < 0 ||
+        H5Tinsert(s2_tid, "b", HOFFSET(s2_t, b), H5T_NATIVE_LONG) < 0 ||
+        H5Tinsert(s2_tid, "c", HOFFSET(s2_t, c), H5T_NATIVE_INT) < 0 ||
+        H5Tinsert(s2_tid, "d", HOFFSET(s2_t, d), H5T_NATIVE_SHORT) < 0)
+        FAIL_STACK_ERROR;
+
+    for (i = 0; i < (int)ndsets; i++) {
+        s2_wbufi[i] = s2_total_wbuf + (i * DSET_SELECT_DIM);
+        s2_rbufi[i] = s2_total_rbuf + (i * DSET_SELECT_DIM);
+
+        wbufs[i] = s2_wbufi[i];
+        rbufs[i] = s2_rbufi[i];
+
+        mem_tids[i] = s2_tid;
+
+        if (H5Sselect_all(mem_sids[i]) < 0)
+            TEST_ERROR;
+        if (H5Sselect_all(file_sids[i]) < 0)
+            TEST_ERROR;
+    }
+
+    /* Initialize the buffer data for all the datasets */
+    for (i = 0; i < (int)ndsets; i++)
+        for (j = 0; j < DSET_SELECT_DIM; j++) {
+            s2_wbufi[i][j].a = 8 * j;
+            s2_wbufi[i][j].b = (long)((8 * j) + 1);
+            s2_wbufi[i][j].c = (8 * j) + 2;
+            s2_wbufi[i][j].d = (short)((8 * j) + 3);
+        }
+
+    /* Copy wbuf if the library will be modifying it */
+    if (mwbuf)
+        HDmemcpy(s2_total_wbuf_bak, s2_total_wbuf, s2_buf_size);
+
+    if (H5Dwrite_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, wbufs) < 0)
+        TEST_ERROR;
+
+    /* Restore wbuf from backup if the library modified it */
+    if (mwbuf)
+        HDmemcpy(s2_total_wbuf, s2_total_wbuf_bak, s2_buf_size);
+
+    if (H5Dread_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, rbufs) < 0)
+        TEST_ERROR;
+
+    /* Verify data read */
+    for (i = 0; i < (int)ndsets; i++)
+        for (j = 0; j < DSET_SELECT_DIM; j++)
+            if (s2_wbufi[i][j].a != s2_rbufi[i][j].a || s2_wbufi[i][j].b != s2_rbufi[i][j].b ||
+                s2_wbufi[i][j].c != s2_rbufi[i][j].c || s2_wbufi[i][j].d != s2_rbufi[i][j].d) {
+                H5_FAILED();
+                HDprintf("    Read different values than written.\n");
+                HDprintf("    For dset %d at index %d\n", i, j);
+                TEST_ERROR;
+            }
+
+    if (H5Pclose(dcpl) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(dxpl) < 0)
+        FAIL_STACK_ERROR;
+
+    for (i = 0; i < (int)ndsets; i++) {
+        if (H5Sclose(file_sids[i]) < 0)
+            FAIL_STACK_ERROR;
+        if (H5Sclose(mem_sids[i]) < 0)
+            FAIL_STACK_ERROR;
+        if (H5Dclose(dset_dids[i]) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    HDfree(total_wbuf);
+    HDfree(total_wbuf_bak);
+    HDfree(total_rbuf);
+    HDfree(s2_total_wbuf);
+    HDfree(s2_total_wbuf_bak);
+    HDfree(s2_total_rbuf);
+
+    PASSED();
+
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY
+    H5Pclose(dcpl);
+    H5Pclose(dxpl);
+    for (i = 0; i < (int)ndsets; i++) {
+        H5Sclose(file_sids[i]);
+        H5Sclose(mem_sids[i]);
+        H5Dclose(dset_dids[i]);
+    }
+    H5E_END_TRY;
+
+    if (total_wbuf)
+        HDfree(total_wbuf);
+    if (total_wbuf_bak)
+        HDfree(total_wbuf_bak);
+    if (total_rbuf)
+        HDfree(total_rbuf);
+    if (s2_total_wbuf)
+        HDfree(s2_total_wbuf);
+    if (s2_total_wbuf_bak)
+        HDfree(s2_total_wbuf_bak);
+    if (s2_total_rbuf)
+        HDfree(s2_total_rbuf);
+
+    return FAIL;
+
+} /* test_multi_dsets_cmpd_with_bkg() */
+
+/*
+ *  Test 3 for multi-dataset:
+ *  --Datasets with/without type conv+size change+no background buffer
+ *
+ *  Create dset0: H5T_STD_I32BE
+ *  Create other dateasets: randomized H5T_STD_I64LE or H5T_STD_I16LE
+ *
+ *  Case a--setting for write/read to ndsets:
+ *    Datatype for all datasets: H5T_STD_I32BE
+ *
+ *  Case b--setting for write/read to ndsets
+ *    Datatype for all datasets: H5T_STD_I64BE
+ *
+ *  Case c--setting for write/read to ndsets
+ *    Datatype for all datasets: H5T_STD_I16BE
+ */
+static herr_t
+test_multi_dsets_size_change_no_bkg(hid_t fid, unsigned chunked, unsigned mwbuf)
+{
+    size_t  ndsets;
+    int     i, j;
+    hid_t   dcpl = H5I_INVALID_HID;
+    hid_t   dxpl = H5I_INVALID_HID;
+    hsize_t dims[1];
+    hsize_t cdims[1];
+
+    hid_t file_sids[MULTI_NUM_DSETS];
+    hid_t mem_sids[MULTI_NUM_DSETS];
+    hid_t mem_tids[MULTI_NUM_DSETS];
+
+    char  dset_names[MULTI_NUM_DSETS][DSET_NAME_LEN];
+    hid_t dset_dids[MULTI_NUM_DSETS];
+
+    size_t   buf_size, ss;
+    uint8_t *total_wbuf      = NULL;
+    uint8_t *total_wbuf_bak  = NULL;
+    uint8_t *total_rbuf      = NULL;
+    uint8_t *total_lwbuf     = NULL;
+    uint8_t *total_lwbuf_bak = NULL;
+    uint8_t *total_lrbuf     = NULL;
+    uint8_t *total_swbuf     = NULL;
+    uint8_t *total_swbuf_bak = NULL;
+    uint8_t *total_srbuf     = NULL;
+
+    uint8_t *wbufi[MULTI_NUM_DSETS];
+    uint8_t *rbufi[MULTI_NUM_DSETS];
+    uint8_t *lwbufi[MULTI_NUM_DSETS];
+    uint8_t *lrbufi[MULTI_NUM_DSETS];
+    uint8_t *swbufi[MULTI_NUM_DSETS];
+    uint8_t *srbufi[MULTI_NUM_DSETS];
+
+    const void *wbufs[MULTI_NUM_DSETS];
+    void       *rbufs[MULTI_NUM_DSETS];
+
+    ndsets = MAX(MULTI_MIN_DSETS, MULTI_NUM_DSETS);
+
+    /* Create dataset transfer property list */
+    if ((dxpl = H5Pcreate(H5P_DATASET_XFER)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (H5Pset_selection_io(dxpl, H5D_SELECTION_IO_MODE_ON) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Set modify write buffer if requested */
+    if (mwbuf)
+        if (H5Pset_modify_write_buf(dxpl, TRUE) < 0)
+            FAIL_STACK_ERROR;
+
+    dims[0] = DSET_SELECT_DIM;
+
+    if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (chunked) {
+        cdims[0] = DSET_SELECT_CHUNK_DIM;
+        if (H5Pset_chunk(dcpl, 1, cdims) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    /* Set up file space ids, mem space ids, and dataset ids */
+    for (i = 0; i < (int)ndsets; i++) {
+        if ((file_sids[i] = H5Screate_simple(1, dims, NULL)) < 0)
+            FAIL_STACK_ERROR;
+
+        if ((mem_sids[i] = H5Screate_simple(1, dims, NULL)) < 0)
+            FAIL_STACK_ERROR;
+
+        /* Generate dataset name */
+        HDsnprintf(dset_names[i], sizeof(dset_names[i]), "multi_size_dset%d_%s_%s", i,
+                   chunked ? "chunked" : "contig", mwbuf ? "mwbuf" : "nomwbuf");
+
+        /* Create ith dataset */
+        if ((dset_dids[i] = H5Dcreate2(fid, dset_names[i], H5T_STD_I32BE, file_sids[i], H5P_DEFAULT, dcpl,
+                                       H5P_DEFAULT)) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    /* Case a */
+
+    ss       = H5Tget_size(H5T_STD_I32BE);
+    buf_size = ndsets * ss * DSET_SELECT_DIM;
+
+    /* Allocate buffers for all datasets */
+    if (NULL == (total_wbuf = (uint8_t *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+    if (NULL == (total_wbuf_bak = (uint8_t *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+    if (NULL == (total_rbuf = (uint8_t *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+
+    /* Initialize buffer indices */
+    for (i = 0; i < (int)ndsets; i++) {
+        wbufi[i] = total_wbuf + (i * (int)ss * DSET_SELECT_DIM);
+        rbufi[i] = total_rbuf + (i * (int)ss * DSET_SELECT_DIM);
+
+        wbufs[i] = wbufi[i];
+        rbufs[i] = rbufi[i];
+    }
+
+    /* Initialize the buffer data: big endian */
+    for (i = 0; i < (int)ndsets; i++)
+        for (j = 0; j < DSET_SELECT_DIM; j++) {
+            wbufi[i][j * (int)ss + 0] = 0x1;
+            wbufi[i][j * (int)ss + 1] = 0x2;
+            wbufi[i][j * (int)ss + 2] = 0x3;
+            wbufi[i][j * (int)ss + 3] = (uint8_t)(0x4 + j);
+        }
+
+    /* Datatype setting for multi write/read */
+    for (i = 0; i < (int)ndsets; i++)
+        mem_tids[i] = H5T_STD_I32BE;
+
+    /* Copy wbuf if the library will be modifying it */
+    if (mwbuf)
+        HDmemcpy(total_wbuf_bak, total_wbuf, buf_size);
+
+    /* Write data to the dataset */
+    if (H5Dwrite_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, wbufs) < 0)
+        TEST_ERROR;
+
+    /* Restore wbuf from backup if the library modified it */
+    if (mwbuf)
+        HDmemcpy(total_wbuf, total_wbuf_bak, buf_size);
+
+    /* Read data from the dataset */
+    if (H5Dread_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, rbufs) < 0)
+        TEST_ERROR;
+
+    /* Verify */
+    for (i = 0; i < (int)ndsets; i++)
+        /* Only compare when it's at least the size of H5T_STD_I32BE */
+        if (H5Tget_size(H5Dget_type(dset_dids[i])) >= ss) {
+            for (j = 0; j < DSET_SELECT_DIM; j++)
+                if (rbufi[i][(int)ss * j + 0] != wbufi[i][(int)ss * j + 0] ||
+                    rbufi[i][(int)ss * j + 1] != wbufi[i][(int)ss * j + 1] ||
+                    rbufi[i][(int)ss * j + 2] != wbufi[i][(int)ss * j + 2] ||
+                    rbufi[i][(int)ss * j + 3] != wbufi[i][(int)ss * j + 3]) {
+                    H5_FAILED();
+                    HDprintf("    Read different values than written.\n");
+                    HDprintf("    For dset %d at index %d\n", i, j);
+                    TEST_ERROR;
+                }
+        }
+
+    /* Case b */
+
+    ss       = H5Tget_size(H5T_STD_I64BE);
+    buf_size = ndsets * (ss * DSET_SELECT_DIM);
+
+    /* Allocate buffers for all datasets */
+    if (NULL == (total_lwbuf = (uint8_t *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+    if (NULL == (total_lwbuf_bak = (uint8_t *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+    if (NULL == (total_lrbuf = (uint8_t *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+
+    /* Initialize buffer indices */
+    for (i = 0; i < (int)ndsets; i++) {
+        lwbufi[i] = total_lwbuf + (i * (int)ss * DSET_SELECT_DIM);
+        lrbufi[i] = total_lrbuf + (i * (int)ss * DSET_SELECT_DIM);
+
+        wbufs[i] = lwbufi[i];
+        rbufs[i] = lrbufi[i];
+    }
+
+    /* Initialize the buffer data: big endian */
+    for (i = 0; i < (int)ndsets; i++)
+        for (j = 0; j < DSET_SELECT_DIM; j++) {
+            lwbufi[i][j * (int)ss + 0] = 0x1;
+            lwbufi[i][j * (int)ss + 1] = 0x2;
+            lwbufi[i][j * (int)ss + 2] = 0x3;
+            lwbufi[i][j * (int)ss + 3] = 0x4;
+            lwbufi[i][j * (int)ss + 4] = 0x5;
+            lwbufi[i][j * (int)ss + 5] = 0x6;
+            lwbufi[i][j * (int)ss + 6] = 0x7;
+            lwbufi[i][j * (int)ss + 7] = (uint8_t)(0x8 + j);
+        }
+
+    /* Datatype setting for multi write/read */
+    for (i = 0; i < (int)ndsets; i++)
+        mem_tids[i] = H5T_STD_I64BE;
+
+    /* Copy wbuf if the library will be modifying it */
+    if (mwbuf)
+        HDmemcpy(total_lwbuf_bak, total_lwbuf, buf_size);
+
+    /* Write data to the dataset */
+    if (H5Dwrite_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, wbufs) < 0)
+        TEST_ERROR;
+
+    /* Restore wbuf from backup if the library modified it */
+    if (mwbuf)
+        HDmemcpy(total_lwbuf, total_lwbuf_bak, buf_size);
+
+    /* Read data from the dataset */
+    if (H5Dread_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, rbufs) < 0)
+        TEST_ERROR;
+
+    /* Verify */
+    for (i = 0; i < (int)ndsets; i++)
+        /* Only compare when it's the size of H5T_STD_I64BE */
+        if (H5Tget_size(H5Dget_type(dset_dids[i])) >= ss) {
+            for (j = 0; j < DSET_SELECT_DIM; j++)
+                if (lrbufi[i][(int)ss * j + 0] != lwbufi[i][(int)ss * j + 0] ||
+                    lrbufi[i][(int)ss * j + 1] != lwbufi[i][(int)ss * j + 1] ||
+                    lrbufi[i][(int)ss * j + 2] != lwbufi[i][(int)ss * j + 2] ||
+                    lrbufi[i][(int)ss * j + 3] != lwbufi[i][(int)ss * j + 3] ||
+                    lrbufi[i][(int)ss * j + 4] != lwbufi[i][(int)ss * j + 4] ||
+                    lrbufi[i][(int)ss * j + 5] != lwbufi[i][(int)ss * j + 5] ||
+                    lrbufi[i][(int)ss * j + 6] != lwbufi[i][(int)ss * j + 6] ||
+                    lrbufi[i][(int)ss * j + 7] != lwbufi[i][(int)ss * j + 7]) {
+                    H5_FAILED();
+                    HDprintf("    Read different values than written.\n");
+                    HDprintf("    For dset %d at index %d\n", i, j);
+                    TEST_ERROR;
+                }
+        }
+
+    /* Case c */
+
+    ss       = H5Tget_size(H5T_STD_I16BE);
+    buf_size = ndsets * (ss * DSET_SELECT_DIM);
+
+    /* Allocate buffers for all datasets */
+    if (NULL == (total_swbuf = (uint8_t *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+    if (NULL == (total_swbuf_bak = (uint8_t *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+    if (NULL == (total_srbuf = (uint8_t *)HDmalloc(buf_size)))
+        FAIL_STACK_ERROR;
+
+    /* Initialize buffer indices */
+    for (i = 0; i < (int)ndsets; i++) {
+        swbufi[i] = total_swbuf + (i * (int)ss * DSET_SELECT_DIM);
+        srbufi[i] = total_srbuf + (i * (int)ss * DSET_SELECT_DIM);
+
+        wbufs[i] = swbufi[i];
+        rbufs[i] = srbufi[i];
+    }
+
+    /* Initialize the buffer data: big endian */
+    for (i = 0; i < (int)ndsets; i++)
+        for (j = 0; j < DSET_SELECT_DIM; j++) {
+            swbufi[i][j * (int)ss + 0] = 0x1;
+            swbufi[i][j * (int)ss + 1] = (uint8_t)(0x2 + j);
+        }
+
+    /* Datatype setting for multi write/read */
+    for (i = 0; i < (int)ndsets; i++)
+        mem_tids[i] = H5T_STD_I16BE;
+
+    /* Copy wbuf if the library will be modifying it */
+    if (mwbuf)
+        HDmemcpy(total_swbuf_bak, total_swbuf, buf_size);
+
+    /* Write data to the dataset */
+    if (H5Dwrite_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, wbufs) < 0)
+        TEST_ERROR;
+
+    /* Restore wbuf from backup if the library modified it */
+    if (mwbuf)
+        HDmemcpy(total_swbuf, total_swbuf_bak, buf_size);
+
+    /* Read data from the dataset */
+    if (H5Dread_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, rbufs) < 0)
+        TEST_ERROR;
+
+    /* Verify */
+    for (i = 0; i < (int)ndsets; i++)
+        /* Can compare for all cases */
+        for (j = 0; j < DSET_SELECT_DIM; j++)
+            if (srbufi[i][(int)ss * j + 0] != swbufi[i][(int)ss * j + 0] ||
+                srbufi[i][(int)ss * j + 1] != swbufi[i][(int)ss * j + 1]) {
+                H5_FAILED();
+                HDprintf("    Read different values than written.\n");
+                HDprintf("    For dset %d at index %d\n", i, j);
+                TEST_ERROR;
+            }
+
+    if (H5Pclose(dcpl) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(dxpl) < 0)
+        FAIL_STACK_ERROR;
+
+    for (i = 0; i < (int)ndsets; i++) {
+        if (H5Sclose(file_sids[i]) < 0)
+            FAIL_STACK_ERROR;
+        if (H5Sclose(mem_sids[i]) < 0)
+            FAIL_STACK_ERROR;
+        if (H5Dclose(dset_dids[i]) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    HDfree(total_wbuf);
+    HDfree(total_wbuf_bak);
+    HDfree(total_rbuf);
+    HDfree(total_lwbuf);
+    HDfree(total_lwbuf_bak);
+    HDfree(total_lrbuf);
+    HDfree(total_swbuf);
+    HDfree(total_swbuf_bak);
+    HDfree(total_srbuf);
+
+    PASSED();
+
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY
+    H5Pclose(dcpl);
+    H5Pclose(dxpl);
+    for (i = 0; i < (int)ndsets; i++) {
+        H5Sclose(file_sids[i]);
+        H5Sclose(mem_sids[i]);
+        H5Dclose(dset_dids[i]);
+    }
+    H5E_END_TRY;
+
+    if (total_wbuf)
+        HDfree(total_wbuf);
+    if (total_wbuf_bak)
+        HDfree(total_wbuf_bak);
+    if (total_rbuf)
+        HDfree(total_rbuf);
+    if (total_lwbuf)
+        HDfree(total_lwbuf);
+    if (total_lwbuf_bak)
+        HDfree(total_lwbuf_bak);
+    if (total_lrbuf)
+        HDfree(total_lrbuf);
+    if (total_swbuf)
+        HDfree(total_swbuf);
+    if (total_swbuf_bak)
+        HDfree(total_swbuf_bak);
+    if (total_srbuf)
+        HDfree(total_srbuf);
+
+    return FAIL;
+
+} /* test_multi_dsets_size_change_no_bkg() */
+
+/*
+ * Test 4 for multi-dataset:
+ *
+ * Repeat the following test for niter times to ensure the
+ * random combinations of all dataset types are hit.
+ *
+ * Create randomized contiguous or chunked datasets with:
+ * --DSET_WITH_NO_CONV:
+ *   --with no type conversion
+ *   --dataset with H5T_NATIVE_INT
+ * --DSET_WITH_CONV_AND_NO_BKG:
+ *   --type conversion without background buffer
+ *   --dataset with H5T_NATIVE_LONG
+ * --DSET_WITH_CONV_AND_BKG:
+ *   --type conversion with background buffer
+ *   --dataset with compound type s1_t
+ *
+ * Do H5Dwrite_multi() and H5Dread_multi() for the above datasets:
+ * Setting A:
+ * --DSET_WITH_NO_CONV:
+ *   --write: mem_tids[] = H5T_NATIVE_INT
+ *   --read: r_mem_tids[] = H5T_NATIVE_INT
+ * --DSET_WITH_CONV_AND_NO_BKG:
+ *   --write: mem_tids[] = H5T_NATIVE_ULONG
+ *   --read: r_mem_tids[] = H5T_NATIVE_LONG
+ * --DSET_WITH_CONV_AND_BKG:
+ *   --write: mem_tids[] = s1_tid;
+ *   --read: r_mem_tids[i] = s3_tid;
+ *
+ * Setting B:
+ * --DSET_WITH_NO_CONV:
+ *   --write: mem_tids[] = H5T_NATIVE_INT
+ *   --read: r_mem_tids[] = H5T_NATIVE_INT
+ * --DSET_WITH_CONV_AND_NO_BKG:
+ *   --write: mem_tids[] = H5T_NATIVE_LONG;
+ *   --read: r_mem_tids[] = H5T_NATIVE_SHORT;
+ * --DSET_WITH_CONV_AND_BKG:
+ *   --write: mem_tids[] = s4_tid;
+ *   --read: r_mem_tids[i] = s1_tid;
+ *
+ * Verify the result read as below:
+ * Setting A:
+ * --DSET_WITH_NO_CONV:
+ *   --verify data read in rbufi1[i][j] is same as wbufi1[i][j]
+ * --DSET_WITH_CONV_AND_NO_BKG:
+ *   --verify data read in l_rbufi2[i][j] is all LONG_MAX
+ * --DSET_WITH_CONV_AND_BKG:
+ *   --verify all fields read in s3_rbufi3[i][j] is the
+ *     reverse of s1_wbufi3[i][j]
+ * Setting B:
+ * --DSET_WITH_NO_CONV:
+ *   --verify data read in rbufi1[i][j] is same as wbufi1[i][j]
+ * --DSET_WITH_CONV_AND_NO_BKG:
+ *   --verify data read in s_rbufi2[i][j] is all SHRT_MAX
+ * --DSET_WITH_CONV_AND_BKG:
+ *   --verify fields read in s1_rbufi3[i][j] is as follows:
+ *     --fields 'a' and 'c' are as  s1_wbufi3[i][j].a and s1_wbufi3[i][j].c
+ *     --fields 'b' and 'd' are (DSET_SELECT_DIM + j + start[0])
+ *
+ */
+static herr_t
+test_multi_dsets_all(int niter, hid_t fid, unsigned chunked, unsigned mwbuf)
+{
+    size_t  ndsets;
+    int     i, j, mm;
+    int     s, n;
+    hid_t   dcpl = H5I_INVALID_HID;
+    hid_t   dxpl = H5I_INVALID_HID;
+    hsize_t dims[1];
+    hsize_t cdims[1];
+
+    hid_t file_sids[MULTI_NUM_DSETS];
+    hid_t mem_sids[MULTI_NUM_DSETS];
+    hid_t mem_tids[MULTI_NUM_DSETS];
+    hid_t r_mem_tids[MULTI_NUM_DSETS];
+
+    multi_dset_type_t dset_types[MULTI_NUM_DSETS];
+
+    hid_t s1_tid = H5I_INVALID_HID;
+    hid_t s3_tid = H5I_INVALID_HID;
+    hid_t s4_tid = H5I_INVALID_HID;
+
+    char  dset_names[MULTI_NUM_DSETS][DSET_NAME_LEN];
+    hid_t dset_dids[MULTI_NUM_DSETS];
+
+    size_t buf_size;
+
+    int *total_wbuf1     = NULL;
+    int *total_wbuf1_bak = NULL;
+    int *total_rbuf1     = NULL;
+
+    int *wbufi1[MULTI_NUM_DSETS];
+    int *rbufi1[MULTI_NUM_DSETS];
+
+    unsigned long *ul_total_wbuf2     = NULL;
+    unsigned long *ul_total_wbuf2_bak = NULL;
+    long          *l_total_rbuf2      = NULL;
+    unsigned long *ul_wbufi2[MULTI_NUM_DSETS];
+    long          *l_rbufi2[MULTI_NUM_DSETS];
+
+    long  *l_total_wbuf2     = NULL;
+    long  *l_total_wbuf2_bak = NULL;
+    short *s_total_rbuf2     = NULL;
+    long  *l_wbufi2[MULTI_NUM_DSETS];
+    short *s_rbufi2[MULTI_NUM_DSETS];
+
+    s1_t *s1_total_wbuf3     = NULL;
+    s1_t *s1_total_wbuf3_bak = NULL;
+    s3_t *s3_total_rbuf3     = NULL;
+    s1_t *s1_wbufi3[MULTI_NUM_DSETS];
+    s3_t *s3_rbufi3[MULTI_NUM_DSETS];
+
+    s4_t *s4_total_wbuf3     = NULL;
+    s4_t *s4_total_wbuf3_bak = NULL;
+    s1_t *s1_total_rbuf3     = NULL;
+    s4_t *s4_wbufi3[MULTI_NUM_DSETS];
+    s1_t *s1_rbufi3[MULTI_NUM_DSETS];
+
+    const void *wbufs[MULTI_NUM_DSETS];
+    void       *rbufs[MULTI_NUM_DSETS];
+
+    /* for n niter to ensure that all randomized dset_types with multi_dset_type_t will be covered */
+    for (n = 0; n < niter; n++) {
+
+        /* Set up the number of datasets for testing */
+        ndsets = MAX(MULTI_MIN_DSETS, MULTI_NUM_DSETS);
+
+        /* Create dataset transfer property list */
+        if ((dxpl = H5Pcreate(H5P_DATASET_XFER)) < 0)
+            FAIL_STACK_ERROR;
+
+        /* Enable selection I/O */
+        if (H5Pset_selection_io(dxpl, H5D_SELECTION_IO_MODE_ON) < 0)
+            FAIL_STACK_ERROR;
+
+        /* Set modify write buffer if requested */
+        if (mwbuf)
+            if (H5Pset_modify_write_buf(dxpl, TRUE) < 0)
+                FAIL_STACK_ERROR;
+
+        /* Set dataset layout: contiguous or chunked */
+        dims[0] = DSET_SELECT_DIM;
+        if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+            FAIL_STACK_ERROR;
+
+        if (chunked) {
+            cdims[0] = DSET_SELECT_CHUNK_DIM;
+            if (H5Pset_chunk(dcpl, 1, cdims) < 0)
+                FAIL_STACK_ERROR;
+        }
+
+        /* Create compound data type: s1_t  */
+        if ((s1_tid = H5Tcreate(H5T_COMPOUND, sizeof(s1_t))) < 0)
+            FAIL_STACK_ERROR;
+
+        if (H5Tinsert(s1_tid, "a", HOFFSET(s1_t, a), H5T_NATIVE_INT) < 0 ||
+            H5Tinsert(s1_tid, "b", HOFFSET(s1_t, b), H5T_NATIVE_INT) < 0 ||
+            H5Tinsert(s1_tid, "c", HOFFSET(s1_t, c), H5T_NATIVE_INT) < 0 ||
+            H5Tinsert(s1_tid, "d", HOFFSET(s1_t, d), H5T_NATIVE_INT) < 0)
+            FAIL_STACK_ERROR;
+
+        /* Create compound data type: s3_t  */
+        if ((s3_tid = H5Tcreate(H5T_COMPOUND, sizeof(s3_t))) < 0)
+            FAIL_STACK_ERROR;
+
+        if (H5Tinsert(s3_tid, "a", HOFFSET(s3_t, a), H5T_NATIVE_INT) < 0 ||
+            H5Tinsert(s3_tid, "b", HOFFSET(s3_t, b), H5T_NATIVE_INT) < 0 ||
+            H5Tinsert(s3_tid, "c", HOFFSET(s3_t, c), H5T_NATIVE_INT) < 0 ||
+            H5Tinsert(s3_tid, "d", HOFFSET(s3_t, d), H5T_NATIVE_INT) < 0)
+            FAIL_STACK_ERROR;
+
+        /* Create compound data type: s4_t  */
+        if ((s4_tid = H5Tcreate(H5T_COMPOUND, sizeof(s4_t))) < 0)
+            FAIL_STACK_ERROR;
+
+        if (H5Tinsert(s4_tid, "b", HOFFSET(s4_t, b), H5T_NATIVE_UINT) < 0 ||
+            H5Tinsert(s4_tid, "d", HOFFSET(s4_t, d), H5T_NATIVE_UINT) < 0)
+            FAIL_STACK_ERROR;
+
+        /* Create dataset for i ndsets */
+        for (i = 0; i < (int)ndsets; i++) {
+
+            /* File space ids */
+            if ((file_sids[i] = H5Screate_simple(1, dims, NULL)) < 0)
+                FAIL_STACK_ERROR;
+
+            /* Memory space ids */
+            if ((mem_sids[i] = H5Screate_simple(1, dims, NULL)) < 0)
+                FAIL_STACK_ERROR;
+
+            mm = HDrandom() % (int)ndsets;
+            if (mm == 0) {
+                dset_types[i] = DSET_WITH_NO_CONV;
+                HDsnprintf(dset_names[i], sizeof(dset_names[i]), "multi_all_nconv_dset%d_%s_%s", i,
+                           chunked ? "chunked" : "contig", mwbuf ? "mwbuf" : "nomwbuf");
+                if ((dset_dids[i] = H5Dcreate2(fid, dset_names[i], H5T_NATIVE_INT, file_sids[i], H5P_DEFAULT,
+                                               dcpl, H5P_DEFAULT)) < 0)
+                    FAIL_STACK_ERROR;
+            }
+            else if (mm == 1) {
+                dset_types[i] = DSET_WITH_CONV_AND_NO_BKG;
+                HDsnprintf(dset_names[i], sizeof(dset_names[i]), "multi_all_conv_nbkg_dset%d_%s_%s", i,
+                           chunked ? "chunked" : "contig", mwbuf ? "mwbuf" : "nomwbuf");
+                if ((dset_dids[i] = H5Dcreate2(fid, dset_names[i], H5T_NATIVE_LONG, file_sids[i], H5P_DEFAULT,
+                                               dcpl, H5P_DEFAULT)) < 0)
+                    FAIL_STACK_ERROR;
+            }
+            else {
+                dset_types[i] = DSET_WITH_CONV_AND_BKG;
+                HDsnprintf(dset_names[i], sizeof(dset_names[i]), "multi_all_conv_bkg_dset%d_%s_%s", i,
+                           chunked ? "chunked" : "contig", mwbuf ? "mwbuf" : "nomwbuf");
+                if ((dset_dids[i] = H5Dcreate2(fid, dset_names[i], s1_tid, file_sids[i], H5P_DEFAULT, dcpl,
+                                               H5P_DEFAULT)) < 0)
+                    FAIL_STACK_ERROR;
+            }
+
+        } /* end for i ndsets */
+
+        /* Allocate buffers for all datasets */
+
+        /* DSET_WITH_NO_CONV */
+        buf_size = ndsets * DSET_SELECT_DIM * sizeof(int);
+        if (NULL == (total_wbuf1 = (int *)HDmalloc(buf_size)))
+            FAIL_STACK_ERROR;
+        if (mwbuf && NULL == (total_wbuf1_bak = (int *)HDmalloc(buf_size)))
+            FAIL_STACK_ERROR;
+        if (NULL == (total_rbuf1 = (int *)HDmalloc(buf_size)))
+            FAIL_STACK_ERROR;
+
+        /* DSET_WITH_CONV_AND_NO_BKG */
+        buf_size = ndsets * DSET_SELECT_DIM * sizeof(unsigned long);
+        if (NULL == (ul_total_wbuf2 = (unsigned long *)HDmalloc(buf_size)))
+            FAIL_STACK_ERROR;
+        if (mwbuf && NULL == (ul_total_wbuf2_bak = (unsigned long *)HDmalloc(buf_size)))
+            FAIL_STACK_ERROR;
+        buf_size = ndsets * DSET_SELECT_DIM * sizeof(long);
+        if (NULL == (l_total_rbuf2 = (long *)HDmalloc(buf_size)))
+            FAIL_STACK_ERROR;
+
+        buf_size = ndsets * DSET_SELECT_DIM * sizeof(long);
+        if (NULL == (l_total_wbuf2 = (long *)HDmalloc(buf_size)))
+            FAIL_STACK_ERROR;
+        if (mwbuf && NULL == (l_total_wbuf2_bak = (long *)HDmalloc(buf_size)))
+            FAIL_STACK_ERROR;
+        buf_size = ndsets * DSET_SELECT_DIM * sizeof(short);
+        if (NULL == (s_total_rbuf2 = (short *)HDmalloc(buf_size)))
+            FAIL_STACK_ERROR;
+
+        /* DSET_WITH_CONV_AND_BKG */
+        buf_size = ndsets * DSET_SELECT_DIM * sizeof(s1_t);
+        if (NULL == (s1_total_wbuf3 = (s1_t *)HDmalloc(buf_size)))
+            FAIL_STACK_ERROR;
+        if (mwbuf && NULL == (s1_total_wbuf3_bak = (s1_t *)HDmalloc(buf_size)))
+            FAIL_STACK_ERROR;
+        buf_size = ndsets * DSET_SELECT_DIM * sizeof(s3_t);
+        if (NULL == (s3_total_rbuf3 = (s3_t *)HDmalloc(buf_size)))
+            FAIL_STACK_ERROR;
+
+        buf_size = ndsets * DSET_SELECT_DIM * sizeof(s4_t);
+        if (NULL == (s4_total_wbuf3 = (s4_t *)HDmalloc(buf_size)))
+            FAIL_STACK_ERROR;
+        if (mwbuf && NULL == (s4_total_wbuf3_bak = (s4_t *)HDmalloc(buf_size)))
+            FAIL_STACK_ERROR;
+        buf_size = ndsets * DSET_SELECT_DIM * sizeof(s1_t);
+        if (NULL == (s1_total_rbuf3 = (s1_t *)HDmalloc(buf_size)))
+            FAIL_STACK_ERROR;
+
+        /* Test with s settings for ndsets */
+        for (s = SETTING_A; s <= SETTING_B; s++) {
+
+            /* for i ndsets */
+            for (i = 0; i < (int)ndsets; i++) {
+
+                switch (dset_types[i]) {
+
+                    case DSET_WITH_NO_CONV:
+                        /* Initialize buffer indices */
+                        wbufi1[i] = total_wbuf1 + (i * DSET_SELECT_DIM);
+                        rbufi1[i] = total_rbuf1 + (i * DSET_SELECT_DIM);
+
+                        wbufs[i] = wbufi1[i];
+                        rbufs[i] = rbufi1[i];
+
+                        /* Initialize the buffer data */
+                        for (j = 0; j < DSET_SELECT_DIM; j++)
+                            wbufi1[i][j] = (int)j;
+
+                        /* Same for all cases */
+                        mem_tids[i]   = H5T_NATIVE_INT;
+                        r_mem_tids[i] = H5T_NATIVE_INT;
+
+                        break;
+
+                    case DSET_WITH_CONV_AND_NO_BKG:
+
+                        if (s == SETTING_A) {
+                            /* Initialize buffer indices */
+                            ul_wbufi2[i] = ul_total_wbuf2 + (i * DSET_SELECT_DIM);
+                            l_rbufi2[i]  = l_total_rbuf2 + (i * DSET_SELECT_DIM);
+
+                            wbufs[i] = ul_wbufi2[i];
+                            rbufs[i] = l_rbufi2[i];
+
+                            for (j = 0; j < DSET_SELECT_DIM; j++)
+                                ul_wbufi2[i][j] = ULONG_MAX - (unsigned long)j;
+
+                            mem_tids[i]   = H5T_NATIVE_ULONG;
+                            r_mem_tids[i] = H5T_NATIVE_LONG;
+                        }
+                        else if (s == SETTING_B) {
+                            /* Initialize buffer indices */
+                            l_wbufi2[i] = l_total_wbuf2 + (i * DSET_SELECT_DIM);
+                            s_rbufi2[i] = s_total_rbuf2 + (i * DSET_SELECT_DIM);
+
+                            wbufs[i] = l_wbufi2[i];
+                            rbufs[i] = s_rbufi2[i];
+
+                            /* Initialize the buffer data */
+                            for (j = 0; j < DSET_SELECT_DIM; j++)
+                                l_wbufi2[i][j] = LONG_MAX - (long)j;
+
+                            mem_tids[i]   = H5T_NATIVE_LONG;
+                            r_mem_tids[i] = H5T_NATIVE_SHORT;
+                        }
+
+                        break;
+
+                    case DSET_WITH_CONV_AND_BKG:
+
+                        if (s == SETTING_A) {
+                            /* Initialize buffer indices */
+                            s1_wbufi3[i] = s1_total_wbuf3 + (i * DSET_SELECT_DIM);
+                            s3_rbufi3[i] = s3_total_rbuf3 + (i * DSET_SELECT_DIM);
+
+                            wbufs[i] = s1_wbufi3[i];
+                            rbufs[i] = s3_rbufi3[i];
+
+                            /* Initialize buffer data for s1_t */
+                            for (j = 0; j < DSET_SELECT_DIM; j++) {
+                                s1_wbufi3[i][j].a = (4 * j);
+                                s1_wbufi3[i][j].b = (4 * j) + 1;
+                                s1_wbufi3[i][j].c = (4 * j) + 2;
+                                s1_wbufi3[i][j].d = (4 * j) + 3;
+                            }
+                            mem_tids[i]   = s1_tid;
+                            r_mem_tids[i] = s3_tid;
+                        }
+                        else if (s == SETTING_B) {
+                            /* Initialize buffer indices */
+                            s4_wbufi3[i] = s4_total_wbuf3 + (i * DSET_SELECT_DIM);
+                            s1_rbufi3[i] = s1_total_rbuf3 + (i * DSET_SELECT_DIM);
+
+                            wbufs[i] = s4_wbufi3[i];
+                            rbufs[i] = s1_rbufi3[i];
+
+                            /* Initialize buffer data for s4_t */
+                            for (j = 0; j < DSET_SELECT_DIM; j++) {
+                                s4_wbufi3[i][j].b = DSET_SELECT_DIM + (unsigned int)j;
+                                s4_wbufi3[i][j].d = DSET_SELECT_DIM + (unsigned int)j;
+                            }
+                            mem_tids[i]   = s4_tid;
+                            r_mem_tids[i] = s1_tid;
+                        }
+
+                        break;
+
+                    case DSET_NTTYPES:
+                    default:
+                        TEST_ERROR;
+
+                } /* end switch dset_types */
+
+            } /* end for i ndsets */
+
+            /* Copy wbufs if the library will be modifying them */
+            if (mwbuf) {
+                HDmemcpy(total_wbuf1_bak, total_wbuf1, ndsets * DSET_SELECT_DIM * sizeof(int));
+                HDmemcpy(ul_total_wbuf2_bak, ul_total_wbuf2,
+                         ndsets * DSET_SELECT_DIM * sizeof(unsigned long));
+                HDmemcpy(l_total_wbuf2_bak, l_total_wbuf2, ndsets * DSET_SELECT_DIM * sizeof(long));
+                HDmemcpy(s1_total_wbuf3_bak, s1_total_wbuf3, ndsets * DSET_SELECT_DIM * sizeof(s1_t));
+                HDmemcpy(s4_total_wbuf3_bak, s4_total_wbuf3, ndsets * DSET_SELECT_DIM * sizeof(s4_t));
+            }
+
+            if (H5Dwrite_multi(ndsets, dset_dids, mem_tids, mem_sids, file_sids, dxpl, wbufs) < 0)
+                TEST_ERROR;
+
+            /* Restore wbufs from backup if the library modified them */
+            if (mwbuf) {
+                HDmemcpy(total_wbuf1, total_wbuf1_bak, ndsets * DSET_SELECT_DIM * sizeof(int));
+                HDmemcpy(ul_total_wbuf2, ul_total_wbuf2_bak,
+                         ndsets * DSET_SELECT_DIM * sizeof(unsigned long));
+                HDmemcpy(l_total_wbuf2, l_total_wbuf2_bak, ndsets * DSET_SELECT_DIM * sizeof(long));
+                HDmemcpy(s1_total_wbuf3, s1_total_wbuf3_bak, ndsets * DSET_SELECT_DIM * sizeof(s1_t));
+                HDmemcpy(s4_total_wbuf3, s4_total_wbuf3_bak, ndsets * DSET_SELECT_DIM * sizeof(s4_t));
+            }
+
+            if (H5Dread_multi(ndsets, dset_dids, r_mem_tids, mem_sids, file_sids, dxpl, rbufs) < 0)
+                TEST_ERROR;
+
+            /* Verify result read */
+            /* for i ndsets */
+            for (i = 0; i < (int)ndsets; i++) {
+                switch (dset_types[i]) {
+
+                    case DSET_WITH_NO_CONV:
+                        for (j = 0; j < DSET_SELECT_DIM; j++)
+                            if (rbufi1[i][j] != wbufi1[i][j]) {
+                                H5_FAILED();
+                                HDprintf("    Read different values than written.\n");
+                                HDprintf("    For dset %d at index %d\n", i, j);
+                                TEST_ERROR;
+                            }
+
+                        break;
+
+                    case DSET_WITH_CONV_AND_NO_BKG:
+                        if (s == SETTING_A) {
+                            for (j = 0; j < DSET_SELECT_DIM; j++)
+                                if (l_rbufi2[i][j] != LONG_MAX) {
+                                    H5_FAILED();
+                                    HDprintf("    Read different values than written.\n");
+                                    HDprintf("    For dset %d at index %d\n", i, j);
+                                    TEST_ERROR;
+                                }
+                        }
+                        else if (s == SETTING_B) {
+                            for (j = 0; j < DSET_SELECT_DIM; j++)
+                                if (s_rbufi2[i][j] != SHRT_MAX) {
+                                    H5_FAILED();
+                                    HDprintf("    Read different values than written.\n");
+                                    HDprintf("    For dset %d at index %d\n", i, j);
+                                }
+                        }
+
+                        break;
+
+                    case DSET_WITH_CONV_AND_BKG:
+                        if (s == SETTING_A) {
+                            for (j = 0; j < DSET_SELECT_DIM; j++)
+                                if (s3_rbufi3[i][j].a != s1_wbufi3[i][j].a ||
+                                    s3_rbufi3[i][j].b != s1_wbufi3[i][j].b ||
+                                    s3_rbufi3[i][j].c != s1_wbufi3[i][j].c ||
+                                    s3_rbufi3[i][j].d != s1_wbufi3[i][j].d) {
+                                    H5_FAILED();
+                                    HDprintf("    Read different values than written.\n");
+                                    HDprintf("    For dset %d at index %d\n", i, j);
+                                }
+                        }
+                        else if (s == SETTING_B) {
+                            for (j = 0; j < DSET_SELECT_DIM; j++)
+                                if (s1_rbufi3[i][j].a != s1_wbufi3[i][j].a ||
+                                    s1_rbufi3[i][j].b != (DSET_SELECT_DIM + j) ||
+                                    s1_rbufi3[i][j].c != s1_wbufi3[i][j].c ||
+                                    s1_rbufi3[i][j].d != (DSET_SELECT_DIM + j)) {
+                                    H5_FAILED();
+                                    HDprintf("    Read different values than written.\n");
+                                    HDprintf("    For dset %d at index %d\n", i, j);
+                                }
+                        }
+
+                        break;
+
+                    case DSET_NTTYPES:
+                    default:
+                        TEST_ERROR;
+
+                } /* end switch dset_types */
+
+            } /* end for i ndsets */
+
+        } /* end for s settings */
+
+        /* Closing */
+        if (H5Pclose(dcpl) < 0)
+            FAIL_STACK_ERROR;
+        if (H5Pclose(dxpl) < 0)
+            FAIL_STACK_ERROR;
+
+        if (H5Tclose(s1_tid) < 0)
+            FAIL_STACK_ERROR;
+        if (H5Tclose(s3_tid) < 0)
+            FAIL_STACK_ERROR;
+        if (H5Tclose(s4_tid) < 0)
+            FAIL_STACK_ERROR;
+
+        for (i = 0; i < (int)ndsets; i++) {
+            if (H5Sclose(file_sids[i]) < 0)
+                FAIL_STACK_ERROR;
+            if (H5Dclose(dset_dids[i]) < 0)
+                FAIL_STACK_ERROR;
+            /* Don't delete the last set of datasets */
+            if ((n + 1) != niter)
+                if (H5Ldelete(fid, dset_names[i], H5P_DEFAULT) < 0)
+                    FAIL_STACK_ERROR;
+        }
+
+        /* Freeing */
+        HDfree(total_wbuf1);
+        total_wbuf1 = NULL;
+        HDfree(total_wbuf1_bak);
+        total_wbuf1_bak = NULL;
+        HDfree(total_rbuf1);
+        total_rbuf1 = NULL;
+
+        HDfree(ul_total_wbuf2);
+        ul_total_wbuf2 = NULL;
+        HDfree(ul_total_wbuf2_bak);
+        ul_total_wbuf2_bak = NULL;
+        HDfree(l_total_rbuf2);
+        l_total_rbuf2 = NULL;
+        HDfree(l_total_wbuf2);
+        l_total_wbuf2 = NULL;
+        HDfree(l_total_wbuf2_bak);
+        l_total_wbuf2_bak = NULL;
+        HDfree(s_total_rbuf2);
+        s_total_rbuf2 = NULL;
+
+        HDfree(s1_total_wbuf3);
+        s1_total_wbuf3 = NULL;
+        HDfree(s1_total_wbuf3_bak);
+        s1_total_wbuf3_bak = NULL;
+        HDfree(s3_total_rbuf3);
+        s3_total_rbuf3 = NULL;
+        HDfree(s4_total_wbuf3);
+        s4_total_wbuf3 = NULL;
+        HDfree(s4_total_wbuf3_bak);
+        s4_total_wbuf3_bak = NULL;
+        HDfree(s1_total_rbuf3);
+        s1_total_rbuf3 = NULL;
+
+    } /* end for n niter */
+
+    PASSED();
+
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY
+    H5Pclose(dcpl);
+    H5Pclose(dxpl);
+    H5Tclose(s1_tid);
+    H5Tclose(s3_tid);
+    H5Tclose(s4_tid);
+    for (i = 0; i < (int)ndsets; i++) {
+        H5Sclose(file_sids[i]);
+        H5Sclose(mem_sids[i]);
+        H5Dclose(dset_dids[i]);
+    }
+    H5E_END_TRY;
+
+    if (total_wbuf1)
+        HDfree(total_wbuf1);
+    if (total_wbuf1_bak)
+        HDfree(total_wbuf1_bak);
+    if (total_rbuf1)
+        HDfree(total_rbuf1);
+
+    if (ul_total_wbuf2)
+        HDfree(ul_total_wbuf2);
+    if (ul_total_wbuf2_bak)
+        HDfree(ul_total_wbuf2_bak);
+    if (l_total_rbuf2)
+        HDfree(l_total_rbuf2);
+    if (l_total_wbuf2)
+        HDfree(l_total_wbuf2);
+    if (l_total_wbuf2_bak)
+        HDfree(l_total_wbuf2_bak);
+    if (s_total_rbuf2)
+        HDfree(s_total_rbuf2);
+
+    if (s1_total_wbuf3)
+        HDfree(s1_total_wbuf3);
+    if (s1_total_wbuf3_bak)
+        HDfree(s1_total_wbuf3_bak);
+    if (s3_total_rbuf3)
+        HDfree(s3_total_rbuf3);
+    if (s4_total_wbuf3)
+        HDfree(s4_total_wbuf3);
+    if (s4_total_wbuf3_bak)
+        HDfree(s4_total_wbuf3_bak);
+    if (s1_total_rbuf3)
+        HDfree(s1_total_rbuf3);
+
+    return FAIL;
+
+} /* test_multi_dsets_all() */
+
+/*
+ * Verify H5Pset/get_selection_io API works as expected
+ */
+static herr_t
+test_set_get_select_io_mode(hid_t fid)
+{
+    hid_t                   did  = H5I_INVALID_HID;
+    hid_t                   sid  = H5I_INVALID_HID;
+    hid_t                   dcpl = H5I_INVALID_HID;
+    hid_t                   dxpl = H5I_INVALID_HID;
+    hsize_t                 dims[1];
+    hsize_t                 cdims[1];
+    int                     i;
+    long                    wbuf[DSET_SELECT_DIM];
+    H5D_selection_io_mode_t selection_io_mode;
+
+    HDprintf("\n");
+    TESTING("H5Pget/set_selection_io_mode()");
+
+    if ((dxpl = H5Pcreate(H5P_DATASET_XFER)) < 0)
+        TEST_ERROR;
+
+    /* default case */
+    if (H5Pget_selection_io(dxpl, &selection_io_mode) < 0)
+        TEST_ERROR;
+
+    if (selection_io_mode != H5D_SELECTION_IO_MODE_DEFAULT)
+        TEST_ERROR;
+
+    /* Disable case */
+    if (H5Pset_selection_io(dxpl, H5D_SELECTION_IO_MODE_OFF) < 0)
+        TEST_ERROR;
+
+    if (H5Pget_selection_io(dxpl, &selection_io_mode) < 0)
+        TEST_ERROR;
+
+    if (selection_io_mode != H5D_SELECTION_IO_MODE_OFF)
+        TEST_ERROR;
+
+    /* Enable case */
+    if (H5Pset_selection_io(dxpl, H5D_SELECTION_IO_MODE_ON) < 0)
+        TEST_ERROR;
+
+    if (H5Pget_selection_io(dxpl, &selection_io_mode) < 0)
+        TEST_ERROR;
+
+    if (selection_io_mode != H5D_SELECTION_IO_MODE_ON)
+        TEST_ERROR;
+
+    /* Create 1d data space */
+    dims[0] = DSET_SELECT_DIM;
+    if ((sid = H5Screate_simple(1, dims, NULL)) < 0)
+        FAIL_STACK_ERROR;
+    if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        FAIL_STACK_ERROR;
+
+    cdims[0] = DSET_SELECT_CHUNK_DIM;
+    if (H5Pset_chunk(dcpl, 1, cdims) < 0)
+        FAIL_STACK_ERROR;
+
+    if ((did = H5Dcreate2(fid, "test_chk_dset", H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl, H5P_DEFAULT)) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Initialize data */
+    for (i = 0; i < DSET_SELECT_DIM; i++)
+        wbuf[i] = i;
+
+    /* May change the selection io actually performed */
+    if (H5Dwrite(did, H5T_NATIVE_LONG, H5S_ALL, H5S_ALL, dxpl, wbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    if (H5Pget_selection_io(dxpl, &selection_io_mode) < 0)
+        TEST_ERROR;
+
+    /* Should still be enabled */
+    if (selection_io_mode != H5D_SELECTION_IO_MODE_ON)
+        TEST_ERROR;
+
+    if (H5Dclose(did) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(dcpl) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(dxpl) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Sclose(sid) < 0)
+        FAIL_STACK_ERROR;
+
+    PASSED();
+
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY
+    {
+        H5Sclose(sid);
+        H5Dclose(did);
+        H5Pclose(dcpl);
+        H5Pclose(dxpl);
+    }
+    H5E_END_TRY;
+
+    return FAIL;
+} /* test_set_get_select_io_mode() */
+
+/*
+ * To test with various test_mode that no selelction I/O is performed
+ *
+ * Note: It's the responsibility of the tester to feed proper combination
+ *       of test_mode as needed.
+ */
+static herr_t
+test_no_selection_io_cause_mode(const char *filename, hid_t fapl, uint32_t test_mode)
+{
+    hid_t    dcpl = H5I_INVALID_HID;
+    hid_t    dxpl = H5I_INVALID_HID;
+    hid_t    fid  = H5I_INVALID_HID;
+    hid_t    fcpl = H5I_INVALID_HID;
+    hid_t    did  = H5I_INVALID_HID;
+    hid_t    sid  = H5I_INVALID_HID;
+    hsize_t  dims[1];
+    hsize_t  cdims[1];
+    hbool_t  is_chunked                           = FALSE;
+    hid_t    tid                                  = H5T_NATIVE_INT;
+    uint32_t no_selection_io_cause_write          = 0;
+    uint32_t no_selection_io_cause_read           = 0;
+    uint32_t no_selection_io_cause_write_expected = 0;
+    uint32_t no_selection_io_cause_read_expected  = 0;
+    int      wbuf[DSET_SELECT_DIM];
+    int      rbuf[DSET_SELECT_DIM];
+    int      i;
+
+    if ((fcpl = H5Pcreate(H5P_FILE_CREATE)) < 0)
+        FAIL_STACK_ERROR;
+
+    if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        FAIL_STACK_ERROR;
+    if ((dxpl = H5Pcreate(H5P_DATASET_XFER)) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Enable page buffering to trigger H5D_PAGE_BUFFER */
+    if (test_mode & TEST_PAGE_BUFFER) {
+        if (H5Pset_page_buffer_size(fapl, 4096, 0, 0) < 0)
+            FAIL_STACK_ERROR;
+        if (H5Pset_file_space_strategy(fcpl, H5F_FSPACE_STRATEGY_PAGE, 0, (hsize_t)1) < 0)
+            FAIL_STACK_ERROR;
+    }
+    else {
+        /* Not page buffer test, reset to default */
+        if (H5Pset_page_buffer_size(fapl, 0, 0, 0) < 0)
+            FAIL_STACK_ERROR;
+        if (H5Pset_file_space_strategy(fcpl, H5F_FSPACE_STRATEGY_FSM_AGGR, 0, (hsize_t)1) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    if ((fid = H5Fcreate(filename, H5F_ACC_TRUNC, fcpl, fapl)) < 0)
+        FAIL_STACK_ERROR;
+
+    /* If default mode, 1st write will trigger cb, 2nd write will trigger sieve */
+    /* If on mode, will trigger nothing because the on mode path is different */
+    /* Need 2 writes */
+    if (test_mode & TEST_CONTIGUOUS_SIEVE_BUFFER) {
+        no_selection_io_cause_write_expected |= H5D_SEL_IO_CONTIGUOUS_SIEVE_BUFFER;
+        no_selection_io_cause_read_expected |= H5D_SEL_IO_CONTIGUOUS_SIEVE_BUFFER;
+    }
+
+    if (test_mode & TEST_NOT_CONTIGUOUS_OR_CHUNKED_DATASET) {
+        if (H5Pset_layout(dcpl, H5D_COMPACT) < 0)
+            FAIL_STACK_ERROR;
+        no_selection_io_cause_write_expected |= H5D_SEL_IO_NOT_CONTIGUOUS_OR_CHUNKED_DATASET;
+        no_selection_io_cause_read_expected |= H5D_SEL_IO_NOT_CONTIGUOUS_OR_CHUNKED_DATASET;
+    }
+
+    if (test_mode == TEST_DATASET_FILTER) {
+        if (H5Pset_deflate(dcpl, 9) < 0)
+            FAIL_STACK_ERROR;
+        is_chunked = TRUE;
+        no_selection_io_cause_write_expected |= H5D_SEL_IO_DATASET_FILTER;
+        no_selection_io_cause_read_expected |= H5D_SEL_IO_DATASET_FILTER;
+    }
+
+    if (test_mode == TEST_CHUNK_CACHE) {
+        is_chunked = TRUE;
+        no_selection_io_cause_write_expected |= H5D_SEL_IO_CHUNK_CACHE;
+        no_selection_io_cause_read_expected |= H5D_SEL_IO_CHUNK_CACHE;
+    }
+
+    if (test_mode == TEST_DISABLE_BY_API) {
+        if (H5Pset_selection_io(dxpl, H5D_SELECTION_IO_MODE_OFF) < 0)
+            FAIL_STACK_ERROR;
+        no_selection_io_cause_write_expected |= H5D_SEL_IO_DISABLE_BY_API;
+        no_selection_io_cause_read_expected |= H5D_SEL_IO_DISABLE_BY_API;
+    }
+
+    if (test_mode & TEST_NO_VECTOR_OR_SELECTION_IO_CB) {
+        no_selection_io_cause_write_expected |= H5D_SEL_IO_DEFAULT_OFF;
+        no_selection_io_cause_read_expected |= H5D_SEL_IO_DEFAULT_OFF;
+    }
+
+    /* Datatype conversion */
+    if (test_mode & TEST_DATATYPE_CONVERSION) {
+        if (H5Pset_selection_io(dxpl, H5D_SELECTION_IO_MODE_ON) < 0)
+            FAIL_STACK_ERROR;
+        tid = H5T_NATIVE_UINT;
+
+        /* If we're testing a too small tconv buffer, set the buffer to be too small */
+        if (test_mode & TEST_TCONV_BUF_TOO_SMALL) {
+            if (H5Pset_buffer(dxpl, sizeof(int), NULL, NULL) < 0)
+                FAIL_STACK_ERROR;
+
+            /* If we're using in-place type conversion sel io will succeed and only switch to scalar at the
+             * VFL */
+            if (test_mode & TEST_IN_PLACE_TCONV) {
+                if (H5Pset_modify_write_buf(dxpl, TRUE) < 0)
+                    FAIL_STACK_ERROR;
+                no_selection_io_cause_write_expected |= H5D_SEL_IO_NO_VECTOR_OR_SELECTION_IO_CB;
+            }
+            else
+                no_selection_io_cause_write_expected |= H5D_SEL_IO_TCONV_BUF_TOO_SMALL;
+
+            /* In-place type conversion for read doesn't require modify_write_buf */
+            no_selection_io_cause_read_expected |= H5D_SEL_IO_NO_VECTOR_OR_SELECTION_IO_CB;
+        }
+        else {
+            /* sel io will succeed and only switch to scalar at the VFL */
+            no_selection_io_cause_write_expected |= H5D_SEL_IO_NO_VECTOR_OR_SELECTION_IO_CB;
+            no_selection_io_cause_read_expected |= H5D_SEL_IO_NO_VECTOR_OR_SELECTION_IO_CB;
+        }
+    }
+
+    if (test_mode & TEST_PAGE_BUFFER) {
+        no_selection_io_cause_write_expected |= H5D_SEL_IO_PAGE_BUFFER;
+        no_selection_io_cause_read_expected |= H5D_SEL_IO_PAGE_BUFFER;
+    }
+
+    /* Create 1d data space */
+    dims[0] = DSET_SELECT_DIM;
+    if ((sid = H5Screate_simple(1, dims, NULL)) < 0)
+        FAIL_STACK_ERROR;
+
+    if (is_chunked) {
+        cdims[0] = DSET_SELECT_CHUNK_DIM;
+        if (H5Pset_chunk(dcpl, 1, cdims) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    if ((did = H5Dcreate2(fid, "no_selection_io_cause", H5T_NATIVE_INT, sid, H5P_DEFAULT, dcpl,
+                          H5P_DEFAULT)) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Initialize data */
+    for (i = 0; i < DSET_SELECT_DIM; i++)
+        wbuf[i] = i;
+
+    if (H5Dwrite(did, tid, H5S_ALL, H5S_ALL, dxpl, wbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    if (test_mode & TEST_CONTIGUOUS_SIEVE_BUFFER) {
+        if (H5Dwrite(did, tid, H5S_ALL, H5S_ALL, dxpl, wbuf) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    if (H5Pget_no_selection_io_cause(dxpl, &no_selection_io_cause_write) < 0)
+        TEST_ERROR;
+
+    /* Verify causes of no selection I/O for write are as expected */
+    if (no_selection_io_cause_write != no_selection_io_cause_write_expected)
+        TEST_ERROR;
+
+    /* Flush to clear the sieve buf */
+    if (test_mode & TEST_NO_VECTOR_OR_SELECTION_IO_CB || test_mode & TEST_DATATYPE_CONVERSION ||
+        test_mode & TEST_PAGE_BUFFER) {
+
+        if (H5Dflush(did) < 0)
+            FAIL_STACK_ERROR;
+    }
+
+    if (H5Dread(did, tid, H5S_ALL, H5S_ALL, dxpl, rbuf) < 0)
+        FAIL_STACK_ERROR;
+
+    /* Verify causes of no selection I/O for write is as expected */
+    if (H5Pget_no_selection_io_cause(dxpl, &no_selection_io_cause_read) < 0)
+        TEST_ERROR;
+
+    /* Verify causes of no selection I/O for read are as expected */
+    if (no_selection_io_cause_read != no_selection_io_cause_read_expected)
+        TEST_ERROR;
+
+    if (H5Dclose(did) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Sclose(sid) < 0)
+        FAIL_STACK_ERROR;
+
+    if (H5Pclose(dcpl) < 0)
+        FAIL_STACK_ERROR;
+    if (H5Pclose(dxpl) < 0)
+        FAIL_STACK_ERROR;
+
+    if (H5Fclose(fid) < 0)
+        FAIL_STACK_ERROR;
+
+    if (H5Pclose(fcpl) < 0)
+        FAIL_STACK_ERROR;
+
+    return SUCCEED;
+
+error:
+    H5E_BEGIN_TRY
+    {
+        H5Pclose(fcpl);
+        H5Pclose(dcpl);
+        H5Pclose(dxpl);
+        H5Dclose(did);
+        H5Dclose(sid);
+        H5Fclose(fid);
+    }
+    H5E_END_TRY;
+
+    return FAIL;
+} /* test_no_selection_io_cause_mode() */
+
+/*
+ * Test for causes of not performing selection I/O
+ */
+static herr_t
+test_get_no_selection_io_cause(const char *filename, hid_t fapl)
+{
+
+    int errs = 0;
+
+    HDprintf("\n");
+    TESTING("H5Pget_no_selection_io_cause()");
+
+    errs += test_no_selection_io_cause_mode(filename, fapl, TEST_DISABLE_BY_API);
+    errs += test_no_selection_io_cause_mode(filename, fapl, TEST_NOT_CONTIGUOUS_OR_CHUNKED_DATASET);
+    errs += test_no_selection_io_cause_mode(filename, fapl, TEST_CONTIGUOUS_SIEVE_BUFFER);
+    errs += test_no_selection_io_cause_mode(filename, fapl, TEST_DATASET_FILTER);
+    errs += test_no_selection_io_cause_mode(filename, fapl, TEST_CHUNK_CACHE);
+    errs += test_no_selection_io_cause_mode(filename, fapl, TEST_NO_VECTOR_OR_SELECTION_IO_CB);
+    errs += test_no_selection_io_cause_mode(filename, fapl, TEST_DATATYPE_CONVERSION);
+    errs +=
+        test_no_selection_io_cause_mode(filename, fapl, TEST_DATATYPE_CONVERSION | TEST_TCONV_BUF_TOO_SMALL);
+    errs += test_no_selection_io_cause_mode(
+        filename, fapl, TEST_DATATYPE_CONVERSION | TEST_TCONV_BUF_TOO_SMALL | TEST_IN_PLACE_TCONV);
+#ifndef H5_HAVE_PARALLEL
+    errs += test_no_selection_io_cause_mode(filename, fapl, TEST_PAGE_BUFFER);
+#endif
+
+    if (errs) {
+        HDprintf(" FAILED\n");
+        return FAIL;
+    }
+    else {
+        PASSED();
+        return SUCCEED;
+    }
+}
+
+/*-------------------------------------------------------------------------
+ * Function:    main
+ *
+ * Purpose:     Test cases for selection I/O
+ *
+ * Return:      EXIT_SUCCESS/EXIT_FAILURE
+ *
+ * Programmer:
+ *
+ *-------------------------------------------------------------------------
+ */
+int
+main(void)
+{
+    int      nerrors = 0;
+    char     filename[FILENAME_BUF_SIZE];
+    hid_t    fapl = H5I_INVALID_HID;
+    hid_t    fid  = H5I_INVALID_HID;
+    int      test_select_config;
+    unsigned chunked;
+    unsigned dtrans;
+    unsigned mwbuf;
+
+    /* Testing setup */
+    h5_reset();
+    fapl = h5_fileaccess();
+
+    h5_fixname(FILENAME[0], fapl, filename, sizeof filename);
+
+    if ((fid = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0)
+        TEST_ERROR;
+
+    /* Test with contiguous or chunked dataset */
+    for (chunked = FALSE; chunked <= TRUE; chunked++) {
+
+        /* Data transforms only apply to integer or floating-point datasets */
+        /* therefore, not all tests are run with data transform */
+        for (dtrans = FALSE; dtrans <= TRUE; dtrans++) {
+
+            /* Test with and without modify_write_buf turned on */
+            for (mwbuf = FALSE; mwbuf <= TRUE; mwbuf++) {
+                /* Print configuration message */
+                printf("Testing for selection I/O ");
+                if (chunked)
+                    printf("with chunked dataset, ");
+                else
+                    printf("with contiguous dataset, ");
+                if (dtrans)
+                    printf("data transform, ");
+                else
+                    printf("without data transform, ");
+                if (mwbuf)
+                    printf("and with modifying write buffers\n");
+                else
+                    printf("and without modifying write buffers\n");
+
+                for (test_select_config = (int)TEST_NO_TYPE_CONV;
+                     test_select_config < (int)TEST_SELECT_NTESTS; test_select_config++) {
+
+                    switch (test_select_config) {
+                        case TEST_NO_TYPE_CONV: /* case 1 */
+                            TESTING_2("No type conversion (null case)");
+
+                            nerrors += (test_no_type_conv(fid, chunked, dtrans, mwbuf) < 0 ? 1 : 0);
+
+                            break;
+
+                        case TEST_NO_SIZE_CHANGE_NO_BKG: /* case 2 */
+                            TESTING_2("No size change, no background buffer");
+
+                            /* Data transforms does not apply to the dataset datatype for this test */
+                            if (dtrans)
+                                SKIPPED();
+                            else
+                                nerrors += (test_no_size_change_no_bkg(fid, chunked, mwbuf) < 0 ? 1 : 0);
+
+                            break;
+
+                        case TEST_LARGER_MEM_NO_BKG: /* case 3 */
+                            TESTING_2("Larger memory type, no background buffer");
+
+                            nerrors += (test_larger_mem_type_no_bkg(fid, chunked, dtrans, mwbuf) < 0 ? 1 : 0);
+
+                            break;
+
+                        case TEST_SMALLER_MEM_NO_BKG: /* case 4 */
+                            TESTING_2("Smaller memory type, no background buffer");
+
+                            nerrors +=
+                                (test_smaller_mem_type_no_bkg(fid, chunked, dtrans, mwbuf) < 0 ? 1 : 0);
+
+                            break;
+
+                        case TEST_CMPD_WITH_BKG: /* case 5 */
+                            TESTING_2("Compound types with background buffer");
+
+                            /* Data transforms does not apply to the dataset datatype for this test */
+                            if (dtrans)
+                                SKIPPED();
+                            else
+                                nerrors += (test_cmpd_with_bkg(fid, chunked, mwbuf) < 0 ? 1 : 0);
+
+                            break;
+
+                        case TEST_MULTI_CONV_NO_BKG: /* case 6 */
+                            TESTING_2("multi-datasets: type conv + no bkg buffer");
+
+                            nerrors += test_multi_dsets_no_bkg(fid, chunked, dtrans, mwbuf);
+                            break;
+
+                        case TEST_MULTI_CONV_BKG: /* case 7 */
+                            TESTING_2("multi-datasets: type conv + bkg buffer");
+
+                            /* Data transforms does not apply to the dataset datatype for this test */
+                            if (dtrans)
+                                SKIPPED();
+                            else
+                                nerrors += test_multi_dsets_cmpd_with_bkg(fid, chunked, mwbuf);
+
+                            break;
+
+                        case TEST_MULTI_CONV_SIZE_CHANGE: /* case 8 */
+                            TESTING_2("multi-datasets: type conv + size change + no bkg buffer");
+
+                            /* Data transforms does not apply to the dataset datatype for this test */
+                            if (dtrans)
+                                SKIPPED();
+                            else
+                                nerrors += test_multi_dsets_size_change_no_bkg(fid, chunked, mwbuf);
+
+                            break;
+
+                        case TEST_MULTI_ALL: /* case 9 */
+                            TESTING_2("multi-datasets: no conv + conv without bkg + conv with bkg");
+
+                            /* Data transforms does not apply to the dataset datatype for this test */
+                            if (dtrans)
+                                SKIPPED();
+                            else
+                                nerrors += test_multi_dsets_all(10, fid, chunked, mwbuf);
+
+                            break;
+
+                        case TEST_SELECT_NTESTS:
+                        default:
+                            TEST_ERROR;
+
+                    } /* end switch */
+                }     /* end for test_select_config */
+
+            } /* end mwbuf */
+
+        } /* end dtrans */
+
+    } /* end chunked */
+
+    nerrors += test_set_get_select_io_mode(fid);
+
+    if (H5Fclose(fid) < 0)
+        TEST_ERROR;
+
+    /* Use own file */
+    nerrors += test_get_no_selection_io_cause(filename, fapl);
+
+    if (nerrors)
+        goto error;
+
+    printf("\n===================================\n");
+    HDprintf("All selection I/O dataset tests passed.\n");
+    printf("===================================\n");
+
+    h5_cleanup(FILENAME, fapl);
+
+    HDexit(EXIT_SUCCESS);
+
+error:
+    nerrors = MAX(1, nerrors);
+    HDprintf("***** %d SELECTION I/O DATASET TEST%s FAILED! *****\n", nerrors, 1 == nerrors ? "" : "S");
+    HDexit(EXIT_FAILURE);
+
+} /* end main() */
diff --git a/test/testfiles/plist_files/def_dxpl_32be b/test/testfiles/plist_files/def_dxpl_32be
index b13f456..77ed5d1 100644
--- a/test/testfiles/plist_files/def_dxpl_32be
+++ b/test/testfiles/plist_files/def_dxpl_32be
diff --git a/test/testfiles/plist_files/def_dxpl_32le b/test/testfiles/plist_files/def_dxpl_32le
index b13f456..77ed5d1 100644
--- a/test/testfiles/plist_files/def_dxpl_32le
+++ b/test/testfiles/plist_files/def_dxpl_32le
diff --git a/test/testfiles/plist_files/def_dxpl_64be b/test/testfiles/plist_files/def_dxpl_64be
index b13f456..77ed5d1 100644
--- a/test/testfiles/plist_files/def_dxpl_64be
+++ b/test/testfiles/plist_files/def_dxpl_64be
diff --git a/test/testfiles/plist_files/def_dxpl_64le b/test/testfiles/plist_files/def_dxpl_64le
index b13f456..77ed5d1 100644
--- a/test/testfiles/plist_files/def_dxpl_64le
+++ b/test/testfiles/plist_files/def_dxpl_64le
diff --git a/test/testfiles/plist_files/dxpl_32be b/test/testfiles/plist_files/dxpl_32be
index 5ff2ea0..b6ff37d 100644
--- a/test/testfiles/plist_files/dxpl_32be
+++ b/test/testfiles/plist_files/dxpl_32be
diff --git a/test/testfiles/plist_files/dxpl_32le b/test/testfiles/plist_files/dxpl_32le
index 5ff2ea0..b6ff37d 100644
--- a/test/testfiles/plist_files/dxpl_32le
+++ b/test/testfiles/plist_files/dxpl_32le
diff --git a/test/testfiles/plist_files/dxpl_64be b/test/testfiles/plist_files/dxpl_64be
index 5ff2ea0..b6ff37d 100644
--- a/test/testfiles/plist_files/dxpl_64be
+++ b/test/testfiles/plist_files/dxpl_64be
diff --git a/test/testfiles/plist_files/dxpl_64le b/test/testfiles/plist_files/dxpl_64le
index 5ff2ea0..b6ff37d 100644
--- a/test/testfiles/plist_files/dxpl_64le
+++ b/test/testfiles/plist_files/dxpl_64le