Add support for datasets, including I/O and partial I/O. Also support

type conversion (untested). Add more example programs. Other bug fixes/cleanup.

11 files changed, 887 insertions, 1 deletions

diff --git a/examples/Makefile.am b/examples/Makefile.am
index c8c96e8..18cafb6 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -22,7 +22,10 @@
 include $(top_srcdir)/config/commence.am
 
 if BUILD_PARALLEL_CONDITIONAL
-  EXAMPLE_PROG_PARA = ph5example
+  EXAMPLE_PROG_PARA = ph5example h5rados_file_create h5rados_file_open \
+           h5rados_group_create h5rados_group_open h5rados_dset_create \
+           h5rados_dset_open h5rados_dset_write h5rados_dset_read \
+           h5rados_dset_wpartial h5rados_dset_rpartial
 endif
 
 INSTALL_SCRIPT_FILES = run-c-ex.sh
@@ -57,6 +60,10 @@ INSTALL_FILES = h5_write.c h5_read.c h5_extend_write.c h5_chunk_read.c   \
 	  h5_vds.c h5_vds-exc.c \
           h5_vds-exclim.c h5_vds-eiger.c h5_vds-simpleIO.c h5_vds-percival.c \
           h5_vds-percival-unlim.c h5_vds-percival-unlim-maxmin.c
+          h5rados_file_create.c h5rados_file_open.c h5rados_group_create.c \
+          h5rados_group_open.c h5rados_dset_create.c \
+          h5rados_dset_open.c h5rados_dset_write.c h5rados_dset_read.c \
+          h5rados_dset_wpartial.c h5rados_dset_rpartial.c
 
 
 
@@ -134,6 +141,16 @@ h5_vds-simpleIO: $(srcdir)/h5_vds-simpleIO.c
 h5_vds-percival: $(srcdir)/h5_vds-percival.c
 h5_vds-percival-unlim: $(srcdir)/h5_vds-percival-unlim.c
 h5_vds-percival-unlim-maxmin: $(srcdir)/h5_vds-percival-unlim-maxmin.c
+h5rados_file_create: $(srcdir)/h5rados_file_create.c
+h5rados_file_open: $(srcdir)/h5rados_file_open.c
+h5rados_group_create: $(srcdir)/h5rados_group_create.c
+h5rados_group_open: $(srcdir)/h5rados_group_open.c
+h5rados_dset_create: $(srcdir)/h5rados_dset_create.c
+h5rados_dset_open: $(srcdir)/h5rados_dset_open.c
+h5rados_dset_write: $(srcdir)/h5rados_dset_write.c
+h5rados_dset_read: $(srcdir)/h5rados_dset_read.c
+h5rados_dset_wpartial: $(srcdir)/h5rados_dset_wpartial.c
+h5rados_dset_rpartial: $(srcdir)/h5rados_dset_rpartial.c
 
 if BUILD_SHARED_SZIP_CONDITIONAL
 LD_LIBRARY_PATH=$(LL_PATH)
diff --git a/examples/h5rados_dset_create.c b/examples/h5rados_dset_create.c
new file mode 100644
index 0000000..3bf1fa9
--- /dev/null
+++ b/examples/h5rados_dset_create.c
@@ -0,0 +1,71 @@
+#include "h5rados_example.h"
+
+int main(int argc, char *argv[]) {
+    rados_t cluster;
+    char *pool = "mypool";
+    hid_t file = -1, dset = -1, space = -1, fapl = -1;
+    hsize_t dims[2] = {4, 6};
+
+    (void)MPI_Init(&argc, &argv);
+
+    if(argc != 3)
+        PRINTF_ERROR("argc != 3\n");
+
+    if(rados_create(&cluster, NULL) < 0)
+        ERROR;
+    if(rados_conf_read_file(cluster, "ceph.conf") < 0)
+        ERROR;
+
+    /* Initialize VOL */
+    if(H5VLrados_init(cluster, pool) < 0)
+        ERROR;
+
+    /* Set up FAPL */
+    if((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        ERROR;
+    if(H5Pset_fapl_rados(fapl, MPI_COMM_WORLD, MPI_INFO_NULL) < 0)
+        ERROR;
+    if(H5Pset_all_coll_metadata_ops(fapl, true) < 0)
+        ERROR;
+
+    /* Set up dataspace */
+    if((space = H5Screate_simple(2, dims, NULL)) < 0)
+        ERROR;
+
+    /* Open file */
+    if((file = H5Fopen(argv[1], H5F_ACC_RDWR, fapl)) < 0)
+        ERROR;
+
+    printf("Creating dataset\n");
+
+    /* Create dataset */
+    if((dset = H5Dcreate2(file, argv[2], H5T_NATIVE_INT, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
+        ERROR;
+
+    /* Close */
+    if(H5Dclose(dset) < 0)
+        ERROR;
+    if(H5Fclose(file) < 0)
+        ERROR;
+    if(H5Sclose(space) < 0)
+        ERROR;
+    if(H5Pclose(fapl) < 0)
+        ERROR;
+
+    printf("Success\n");
+
+    (void)MPI_Finalize();
+    return 0;
+
+error:
+    H5E_BEGIN_TRY {
+        H5Dclose(dset);
+        H5Fclose(file);
+        H5Sclose(space);
+        H5Pclose(fapl);
+    } H5E_END_TRY;
+
+    (void)MPI_Finalize();
+    return 1;
+}
+
diff --git a/examples/h5rados_dset_open.c b/examples/h5rados_dset_open.c
new file mode 100644
index 0000000..19e29ed
--- /dev/null
+++ b/examples/h5rados_dset_open.c
@@ -0,0 +1,126 @@
+#include "h5rados_example.h"
+
+int main(int argc, char *argv[]) {
+    rados_t cluster;
+    char *pool = "mypool";
+    hid_t file = -1, dset = -1, fapl = -1, space = -1, type = -1, dcpl = -1, dapl = -1, def_dcpl = -1, def_dapl = -1;
+    int ndims;
+    hsize_t dims[2];
+    htri_t tri_ret;
+
+    (void)MPI_Init(&argc, &argv);
+
+    if(argc != 3)
+        PRINTF_ERROR("argc != 3\n");
+
+    if(rados_create(&cluster, NULL) < 0)
+        ERROR;
+    if(rados_conf_read_file(cluster, "ceph.conf") < 0)
+        ERROR;
+
+    /* Initialize VOL */
+    if(H5VLrados_init(cluster, pool) < 0)
+        ERROR;
+
+    /* Set up FAPL */
+    if((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        ERROR;
+    if(H5Pset_fapl_rados(fapl, MPI_COMM_WORLD, MPI_INFO_NULL) < 0)
+        ERROR;
+    if(H5Pset_all_coll_metadata_ops(fapl, true) < 0)
+        ERROR;
+
+    /* Open file */
+    if((file = H5Fopen(argv[1], H5F_ACC_RDONLY, fapl)) < 0)
+        ERROR;
+
+    printf("Opening dataset\n");
+
+    /* Open dataset */
+    if((dset = H5Dopen2(file, argv[2], H5P_DEFAULT)) < 0)
+        ERROR;
+
+    /* Check dataset dataspace */
+    if((space = H5Dget_space(dset)) < 0)
+        ERROR;
+    if((ndims = H5Sget_simple_extent_ndims(space)) < 0)
+        ERROR;
+    if(ndims != 2)
+        PRINTF_ERROR("ndims == %d, expected 2\n", ndims);
+    if(H5Sget_simple_extent_dims(space, dims, NULL) < 0)
+        ERROR;
+    if(dims[0] != 4)
+        PRINTF_ERROR("dims[0] == %d, expected 4\n", (int)dims[0]);
+    if(dims[1] != 6)
+        PRINTF_ERROR("dims[1] == %d, expected 6\n", (int)dims[1]);
+
+    /* Check dataset datatype */
+    if((type = H5Dget_type(dset)) < 0)
+        ERROR;
+    if((tri_ret = H5Tequal(type, H5T_NATIVE_INT)) < 0)
+        ERROR;
+    if(!tri_ret)
+        PRINTF_ERROR("datatype does not equal H5T_NATIVE_INT\n");
+
+    /* Check DCPL */
+    if((dcpl = H5Dget_create_plist(dset)) < 0)
+        ERROR;
+    if((def_dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
+        ERROR;
+    if((tri_ret = H5Pequal(dcpl, def_dcpl)) < 0)
+        ERROR;
+    if(!tri_ret)
+        PRINTF_ERROR("DCPL does not equal default\n");
+
+    /* Check DAPL */
+    if((dapl = H5Dget_access_plist(dset)) < 0)
+        ERROR;
+    if((def_dapl = H5Pcreate(H5P_DATASET_ACCESS)) < 0)
+        ERROR;
+    if((tri_ret = H5Pequal(dapl, def_dapl)) < 0)
+        ERROR;
+    if(!tri_ret)
+        PRINTF_ERROR("DAPL does not equal default\n");
+
+    /* Close */
+    if(H5Dclose(dset) < 0)
+        ERROR;
+    if(H5Fclose(file) < 0)
+        ERROR;
+    if(H5Pclose(fapl) < 0)
+        ERROR;
+    if(H5Sclose(space) < 0)
+        ERROR;
+    if(H5Tclose(type) < 0)
+        ERROR;
+    if(H5Pclose(dcpl) < 0)
+        ERROR;
+    if(H5Pclose(dapl) < 0)
+        ERROR;
+    if(H5Pclose(def_dcpl) < 0)
+        ERROR;
+    if(H5Pclose(def_dapl) < 0)
+        ERROR;
+
+    printf("Success\n");
+
+    (void)MPI_Finalize();
+    return 0;
+
+error:
+    H5E_BEGIN_TRY {
+        H5Dclose(dset);
+        H5Fclose(file);
+        H5Pclose(fapl);
+        H5Sclose(space);
+        H5Tclose(type);
+        H5Pclose(dcpl);
+        H5Pclose(dapl);
+        H5Pclose(def_dcpl);
+        H5Pclose(def_dapl);
+    } H5E_END_TRY;
+
+    (void)MPI_Finalize();
+    return 1;
+}
+
diff --git a/examples/h5rados_dset_read.c b/examples/h5rados_dset_read.c
new file mode 100644
index 0000000..fc7292c
--- /dev/null
+++ b/examples/h5rados_dset_read.c
@@ -0,0 +1,86 @@
+#include "h5rados_example.h"
+#include <time.h>
+
+int main(int argc, char *argv[]) {
+    rados_t cluster;
+    char *pool = "mypool";
+    hid_t file = -1, dset = -1, fapl = -1;
+    int buf[4][6];
+    int i, j;
+
+    (void)MPI_Init(&argc, &argv);
+
+    /* Seed random number generator */
+    srand(time(NULL));
+
+    if(argc != 3)
+        PRINTF_ERROR("argc != 3\n");
+
+    if(rados_create(&cluster, NULL) < 0)
+        ERROR;
+    if(rados_conf_read_file(cluster, "ceph.conf") < 0)
+        ERROR;
+
+    /* Initialize VOL */
+    if(H5VLrados_init(cluster, pool) < 0)
+        ERROR;
+
+    /* Set up FAPL */
+    if((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        ERROR;
+    if(H5Pset_fapl_rados(fapl, MPI_COMM_WORLD, MPI_INFO_NULL) < 0)
+        ERROR;
+    if(H5Pset_all_coll_metadata_ops(fapl, true) < 0)
+        ERROR;
+
+    /* Open file */
+    if((file = H5Fopen(argv[1], H5F_ACC_RDONLY, fapl)) < 0)
+        ERROR;
+
+    /* Open dataset */
+    if((dset = H5Dopen2(file, argv[2], H5P_DEFAULT)) < 0)
+        ERROR;
+
+    printf("Reading dataset\n");
+
+    /* Initialize buffer */
+    for(i = 0; i < 4; i++)
+        for(j = 0; j < 6; j++)
+            buf[i][j] = -1;
+
+    /* Read data */
+    if(H5Dread(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf) < 0)
+        ERROR;
+
+    /* Print buffer */
+    printf("Successfully read data. Buffer is:\n");
+    for(i = 0; i < 4; i++) {
+        for(j = 0; j < 6; j++)
+            printf("%d ", buf[i][j]);
+        printf("\n");
+    }
+
+    /* Close */
+    if(H5Dclose(dset) < 0)
+        ERROR;
+    if(H5Fclose(file) < 0)
+        ERROR;
+    if(H5Pclose(fapl) < 0)
+        ERROR;
+
+    printf("Success\n");
+
+    (void)MPI_Finalize();
+    return 0;
+
+error:
+    H5E_BEGIN_TRY {
+        H5Dclose(dset);
+        H5Fclose(file);
+        H5Pclose(fapl);
+    } H5E_END_TRY;
+
+    (void)MPI_Finalize();
+    return 1;
+}
+
diff --git a/examples/h5rados_dset_rpartial.c b/examples/h5rados_dset_rpartial.c
new file mode 100644
index 0000000..622b961
--- /dev/null
+++ b/examples/h5rados_dset_rpartial.c
@@ -0,0 +1,142 @@
+#include "h5rados_example.h"
+#include <time.h>
+
+int main(int argc, char *argv[]) {
+    rados_t cluster;
+    char *pool = "mypool";
+    hid_t file = -1, dset = -1, file_space = -1, mem_space = -1, fapl = -1;
+    hsize_t dims[2] = {4, 6};
+    hsize_t start[2], count[2];
+    int buf[4][6];
+    int rank, mpi_size;
+    char *file_sel_str[2] = {"XXX...", "...XXX"};
+    int i, j;
+
+    (void)MPI_Init(&argc, &argv);
+
+    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+    MPI_Comm_size(MPI_COMM_WORLD, &mpi_size);
+
+    if(mpi_size > 2)
+        PRINTF_ERROR("mpi_size > 2\n");
+
+    /* Seed random number generator */
+    srand(time(NULL));
+
+    if(argc != 3)
+        PRINTF_ERROR("argc != 3\n");
+
+    if(rados_create(&cluster, NULL) < 0)
+        ERROR;
+    if(rados_conf_read_file(cluster, "ceph.conf") < 0)
+        ERROR;
+
+    /* Initialize VOL */
+    if(H5VLrados_init(cluster, pool) < 0)
+        ERROR;
+
+    /* Set up FAPL */
+    if((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        ERROR;
+    if(H5Pset_fapl_rados(fapl, MPI_COMM_WORLD, MPI_INFO_NULL) < 0)
+        ERROR;
+    if(H5Pset_all_coll_metadata_ops(fapl, true) < 0)
+        ERROR;
+
+    /* Open file */
+    if((file = H5Fopen(argv[1], H5F_ACC_RDWR, fapl)) < 0)
+        ERROR;
+
+    /* Open dataset */
+    if((dset = H5Dopen2(file, argv[2], H5P_DEFAULT)) < 0)
+        ERROR;
+
+    if(rank == 1)
+        MPI_Barrier(MPI_COMM_WORLD);
+
+    printf("---------------Rank %d---------------\n", rank);
+    printf("Selecting elements denoted with X\n");
+    printf("Memory File\n");
+    printf("...... %s\n", file_sel_str[rank]);
+    for(i = 1; i < 4; i++)
+        printf(".XXXX. %s\n", file_sel_str[rank]);
+
+    if(rank == 0)
+        MPI_Barrier(MPI_COMM_WORLD);
+    else
+        printf("Reading dataset\n");
+
+    MPI_Barrier(MPI_COMM_WORLD);
+
+    /* Set up dataspaces */
+    if((file_space = H5Screate_simple(2, dims, NULL)) < 0)
+        ERROR;
+    if((mem_space = H5Screate_simple(2, dims, NULL)) < 0)
+        ERROR;
+    start[0] = 0;
+    start[1] = 3 * rank;
+    count[0] = 4;
+    count[1] = 3;
+    if(H5Sselect_hyperslab(file_space, H5S_SELECT_SET, start, NULL, count, NULL) < 0)
+        ERROR;
+    start[0] = 1;
+    start[1] = 1;
+    count[0] = 3;
+    count[1] = 4;
+    if(H5Sselect_hyperslab(mem_space, H5S_SELECT_SET, start, NULL, count, NULL) < 0)
+        ERROR;
+
+    /* Initialize buffer */
+    for(i = 0; i < 4; i++)
+        for(j = 0; j < 6; j++)
+            buf[i][j] = -1;
+
+    /* Read data */
+    if(H5Dread(dset, H5T_NATIVE_INT, mem_space, file_space, H5P_DEFAULT, buf) < 0)
+        ERROR;
+
+    if(rank == 1)
+        MPI_Barrier(MPI_COMM_WORLD);
+
+    /* Fill and print buffer */
+    printf("---------------Rank %d---------------\n", rank);
+    printf("Successfully read data. Buffer is:\n");
+    for(i = 0; i < 4; i++) {
+        for(j = 0; j < 6; j++)
+            printf("%d ", buf[i][j]);
+        printf("\n");
+    }
+
+    if(rank == 0)
+        MPI_Barrier(MPI_COMM_WORLD);
+
+    /* Close */
+    if(H5Dclose(dset) < 0)
+        ERROR;
+    if(H5Fclose(file) < 0)
+        ERROR;
+    if(H5Sclose(file_space) < 0)
+        ERROR;
+    if(H5Sclose(mem_space) < 0)
+        ERROR;
+    if(H5Pclose(fapl) < 0)
+        ERROR;
+
+    printf("Success\n");
+
+    (void)MPI_Finalize();
+    return 0;
+
+error:
+    H5E_BEGIN_TRY {
+        H5Dclose(dset);
+        H5Fclose(file);
+        H5Sclose(file_space);
+        H5Sclose(mem_space);
+        H5Pclose(fapl);
+    } H5E_END_TRY;
+
+    (void)MPI_Finalize();
+    return 1;
+}
+
diff --git a/examples/h5rados_dset_wpartial.c b/examples/h5rados_dset_wpartial.c
new file mode 100644
index 0000000..bb53982
--- /dev/null
+++ b/examples/h5rados_dset_wpartial.c
@@ -0,0 +1,129 @@
+#include "h5rados_example.h"
+#include <time.h>
+
+int main(int argc, char *argv[]) {
+    rados_t cluster;
+    char *pool = "mypool";
+    hid_t file = -1, dset = -1, file_space = -1, mem_space = -1, fapl = -1;
+    hsize_t dims[2] = {4, 6};
+    hsize_t start[2], count[2];
+    int buf[4][6];
+    int rank, mpi_size;
+    char *file_sel_str[2] = {"XXX...", "...XXX"};
+    int i, j;
+
+    (void)MPI_Init(&argc, &argv);
+
+    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
+    MPI_Comm_size(MPI_COMM_WORLD, &mpi_size);
+
+    if(mpi_size != 2)
+        PRINTF_ERROR("mpi_size != 2\n");
+
+    /* Seed random number generator */
+    srand(time(NULL));
+
+    if(argc != 3)
+        PRINTF_ERROR("argc != 3\n");
+
+    if(rados_create(&cluster, NULL) < 0)
+        ERROR;
+    if(rados_conf_read_file(cluster, "ceph.conf") < 0)
+        ERROR;
+
+    /* Initialize VOL */
+    if(H5VLrados_init(cluster, pool) < 0)
+        ERROR;
+
+    /* Set up FAPL */
+    if((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        ERROR;
+    if(H5Pset_fapl_rados(fapl, MPI_COMM_WORLD, MPI_INFO_NULL) < 0)
+        ERROR;
+    if(H5Pset_all_coll_metadata_ops(fapl, true) < 0)
+        ERROR;
+
+    /* Open file */
+    if((file = H5Fopen(argv[1], H5F_ACC_RDWR, fapl)) < 0)
+        ERROR;
+
+    /* Open dataset */
+    if((dset = H5Dopen2(file, argv[2], H5P_DEFAULT)) < 0)
+        ERROR;
+
+    if(rank == 1)
+        MPI_Barrier(MPI_COMM_WORLD);
+
+    printf("---------------Rank %d---------------\n", rank);
+    printf("Selecting elements denoted with X\n");
+    printf("Memory File\n");
+    printf("...... %s\n", file_sel_str[rank]);
+    for(i = 1; i < 4; i++)
+        printf(".XXXX. %s\n", file_sel_str[rank]);
+
+    /* Fill and print buffer */
+    printf("Writing data. Buffer is:\n");
+    for(i = 0; i < 4; i++) {
+        for(j = 0; j < 6; j++) {
+            buf[i][j] = rand() % 10;
+            printf("%d ", buf[i][j]);
+        }
+        printf("\n");
+    }
+
+    if(rank == 0)
+        MPI_Barrier(MPI_COMM_WORLD);
+
+
+    /* Set up dataspaces */
+    if((file_space = H5Screate_simple(2, dims, NULL)) < 0)
+        ERROR;
+    if((mem_space = H5Screate_simple(2, dims, NULL)) < 0)
+        ERROR;
+    start[0] = 0;
+    start[1] = 3 * rank;
+    count[0] = 4;
+    count[1] = 3;
+    if(H5Sselect_hyperslab(file_space, H5S_SELECT_SET, start, NULL, count, NULL) < 0)
+        ERROR;
+    start[0] = 1;
+    start[1] = 1;
+    count[0] = 3;
+    count[1] = 4;
+    if(H5Sselect_hyperslab(mem_space, H5S_SELECT_SET, start, NULL, count, NULL) < 0)
+        ERROR;
+
+    /* Write data */
+    if(H5Dwrite(dset, H5T_NATIVE_INT, mem_space, file_space, H5P_DEFAULT, buf) < 0)
+        ERROR;
+
+    /* Close */
+    if(H5Dclose(dset) < 0)
+        ERROR;
+    if(H5Fclose(file) < 0)
+        ERROR;
+    if(H5Sclose(file_space) < 0)
+        ERROR;
+    if(H5Sclose(mem_space) < 0)
+        ERROR;
+    if(H5Pclose(fapl) < 0)
+        ERROR;
+
+    printf("Success\n");
+
+    (void)MPI_Finalize();
+    return 0;
+
+error:
+    H5E_BEGIN_TRY {
+        H5Dclose(dset);
+        H5Fclose(file);
+        H5Sclose(file_space);
+        H5Sclose(mem_space);
+        H5Pclose(fapl);
+    } H5E_END_TRY;
+
+    (void)MPI_Finalize();
+    return 1;
+}
+
diff --git a/examples/h5rados_dset_write.c b/examples/h5rados_dset_write.c
new file mode 100644
index 0000000..dad96fa
--- /dev/null
+++ b/examples/h5rados_dset_write.c
@@ -0,0 +1,81 @@
+#include "h5rados_example.h"
+#include <time.h>
+
+int main(int argc, char *argv[]) {
+    rados_t cluster;
+    char *pool = "mypool";
+    hid_t file = -1, dset = -1, fapl = -1;
+    int buf[4][6];
+    int i, j;
+
+    (void)MPI_Init(&argc, &argv);
+
+    /* Seed random number generator */
+    srand(time(NULL));
+
+    if(argc != 3)
+        PRINTF_ERROR("argc != 3\n");
+
+    if(rados_create(&cluster, NULL) < 0)
+        ERROR;
+    if(rados_conf_read_file(cluster, "ceph.conf") < 0)
+        ERROR;
+
+    /* Initialize VOL */
+    if(H5VLrados_init(cluster, pool) < 0)
+        ERROR;
+
+    /* Set up FAPL */
+    if((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        ERROR;
+    if(H5Pset_fapl_rados(fapl, MPI_COMM_WORLD, MPI_INFO_NULL) < 0)
+        ERROR;
+    if(H5Pset_all_coll_metadata_ops(fapl, true) < 0)
+        ERROR;
+
+    /* Open file */
+    if((file = H5Fopen(argv[1], H5F_ACC_RDWR, fapl)) < 0)
+        ERROR;
+
+    /* Open dataset */
+    if((dset = H5Dopen2(file, argv[2], H5P_DEFAULT)) < 0)
+        ERROR;
+
+    /* Fill and print buffer */
+    printf("Writing data. Buffer is:\n");
+    for(i = 0; i < 4; i++) {
+        for(j = 0; j < 6; j++) {
+            buf[i][j] = rand() % 10;
+            printf("%d ", buf[i][j]);
+        }
+        printf("\n");
+    }
+
+    /* Write data */
+    if(H5Dwrite(dset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, buf) < 0)
+        ERROR;
+
+    /* Close */
+    if(H5Dclose(dset) < 0)
+        ERROR;
+    if(H5Fclose(file) < 0)
+        ERROR;
+    if(H5Pclose(fapl) < 0)
+        ERROR;
+
+    printf("Success\n");
+
+    (void)MPI_Finalize();
+    return 0;
+
+error:
+    H5E_BEGIN_TRY {
+        H5Dclose(dset);
+        H5Fclose(file);
+        H5Pclose(fapl);
+    } H5E_END_TRY;
+
+    (void)MPI_Finalize();
+    return 1;
+}
+
diff --git a/examples/h5rados_file_create.c b/examples/h5rados_file_create.c
new file mode 100644
index 0000000..493be18
--- /dev/null
+++ b/examples/h5rados_file_create.c
@@ -0,0 +1,54 @@
+#include "h5rados_example.h"
+
+int main(int argc, char *argv[]) {
+    rados_t cluster;
+    char *pool = "mypool";
+    hid_t file = -1, fapl = -1;
+
+    (void)MPI_Init(&argc, &argv);
+
+    if(argc != 2)
+        PRINTF_ERROR("argc != 2\n");
+
+    if(rados_create(&cluster, NULL) < 0)
+        ERROR;
+    if(rados_conf_read_file(cluster, "ceph.conf") < 0)
+        ERROR;
+
+    /* Initialize VOL */
+    if(H5VLrados_init(cluster, pool) < 0)
+        ERROR;
+
+    /* Set up FAPL */
+    if((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        ERROR;
+    if(H5Pset_fapl_rados(fapl, MPI_COMM_WORLD, MPI_INFO_NULL) < 0)
+        ERROR;
+    if(H5Pset_all_coll_metadata_ops(fapl, true) < 0)
+        ERROR;
+
+    /* Create file */
+    if((file = H5Fcreate(argv[1], H5F_ACC_TRUNC, H5P_DEFAULT, fapl)) < 0)
+        ERROR;
+
+    /* Close */
+    if(H5Fclose(file) < 0)
+        ERROR;
+    if(H5Pclose(fapl) < 0)
+        ERROR;
+
+    printf("Success\n");
+
+    (void)MPI_Finalize();
+    return 0;
+
+error:
+    H5E_BEGIN_TRY {
+        H5Fclose(file);
+        H5Pclose(fapl);
+    } H5E_END_TRY;
+
+    (void)MPI_Finalize();
+    return 1;
+}
+
diff --git a/examples/h5rados_file_open.c b/examples/h5rados_file_open.c
new file mode 100644
index 0000000..176d26e
--- /dev/null
+++ b/examples/h5rados_file_open.c
@@ -0,0 +1,54 @@
+#include "h5rados_example.h"
+
+int main(int argc, char *argv[]) {
+    rados_t cluster;
+    char *pool = "mypool";
+    hid_t file = -1, fapl = -1;
+
+    (void)MPI_Init(&argc, &argv);
+
+    if(argc != 2)
+        PRINTF_ERROR("argc != 2\n");
+
+    if(rados_create(&cluster, NULL) < 0)
+        ERROR;
+    if(rados_conf_read_file(cluster, "ceph.conf") < 0)
+        ERROR;
+
+    /* Initialize VOL */
+    if(H5VLrados_init(cluster, pool) < 0)
+        ERROR;
+
+    /* Set up FAPL */
+    if((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        ERROR;
+    if(H5Pset_fapl_rados(fapl, MPI_COMM_WORLD, MPI_INFO_NULL) < 0)
+        ERROR;
+    if(H5Pset_all_coll_metadata_ops(fapl, true) < 0)
+        ERROR;
+
+    /* Create file */
+    if((file = H5Fopen(argv[1], H5F_ACC_RDONLY, fapl)) < 0)
+        ERROR;
+
+    /* Close */
+    if(H5Fclose(file) < 0)
+        ERROR;
+    if(H5Pclose(fapl) < 0)
+        ERROR;
+
+    printf("Success\n");
+
+    (void)MPI_Finalize();
+    return 0;
+
+error:
+    H5E_BEGIN_TRY {
+        H5Fclose(file);
+        H5Pclose(fapl);
+    } H5E_END_TRY;
+
+    (void)MPI_Finalize();
+    return 1;
+}
+
diff --git a/examples/h5rados_group_create.c b/examples/h5rados_group_create.c
new file mode 100644
index 0000000..fcfbbc0
--- /dev/null
+++ b/examples/h5rados_group_create.c
@@ -0,0 +1,63 @@
+#include "h5rados_example.h"
+
+int main(int argc, char *argv[]) {
+    rados_t cluster;
+    char *pool = "mypool";
+    hid_t file = -1, fapl = -1, grp = -1;
+
+    (void)MPI_Init(&argc, &argv);
+
+    if(argc != 3)
+        PRINTF_ERROR("argc != 3\n");
+
+    if(rados_create(&cluster, NULL) < 0)
+        ERROR;
+    if(rados_conf_read_file(cluster, "ceph.conf") < 0)
+        ERROR;
+
+    /* Initialize VOL */
+    if(H5VLrados_init(cluster, pool) < 0)
+        ERROR;
+
+    /* Set up FAPL */
+    if((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        ERROR;
+    if(H5Pset_fapl_rados(fapl, MPI_COMM_WORLD, MPI_INFO_NULL) < 0)
+        ERROR;
+    if(H5Pset_all_coll_metadata_ops(fapl, true) < 0)
+        ERROR;
+
+    /* OPEN file */
+    if((file = H5Fopen(argv[1], H5F_ACC_RDWR, fapl)) < 0)
+        ERROR;
+
+    printf("Creating group\n");
+
+    /* Create group */
+    if((grp = H5Gcreate2(file, argv[2], H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT)) < 0)
+        ERROR;
+
+    /* Close */
+    if(H5Gclose(grp) < 0)
+        ERROR;
+    if(H5Fclose(file) < 0)
+        ERROR;
+    if(H5Pclose(fapl) < 0)
+        ERROR;
+
+    printf("Success\n");
+
+    (void)MPI_Finalize();
+    return 0;
+
+error:
+    H5E_BEGIN_TRY {
+        H5Gclose(grp);
+        H5Fclose(file);
+        H5Pclose(fapl);
+    } H5E_END_TRY;
+
+    (void)MPI_Finalize();
+    return 1;
+}
+
diff --git a/examples/h5rados_group_open.c b/examples/h5rados_group_open.c
new file mode 100644
index 0000000..3339480
--- /dev/null
+++ b/examples/h5rados_group_open.c
@@ -0,0 +1,63 @@
+#include "h5rados_example.h"
+
+int main(int argc, char *argv[]) {
+    rados_t cluster;
+    char *pool = "mypool";
+    hid_t file = -1, fapl = -1, grp = -1;
+
+    (void)MPI_Init(&argc, &argv);
+
+    if(argc != 3)
+        PRINTF_ERROR("argc != 3\n");
+
+    if(rados_create(&cluster, NULL) < 0)
+        ERROR;
+    if(rados_conf_read_file(cluster, "ceph.conf") < 0)
+        ERROR;
+
+    /* Initialize VOL */
+    if(H5VLrados_init(cluster, pool) < 0)
+        ERROR;
+
+    /* Set up FAPL */
+    if((fapl = H5Pcreate(H5P_FILE_ACCESS)) < 0)
+        ERROR;
+    if(H5Pset_fapl_rados(fapl, MPI_COMM_WORLD, MPI_INFO_NULL) < 0)
+        ERROR;
+    if(H5Pset_all_coll_metadata_ops(fapl, true) < 0)
+        ERROR;
+
+    /* Open file */
+    if((file = H5Fopen(argv[1], H5F_ACC_RDONLY, fapl)) < 0)
+        ERROR;
+
+    printf("Opening group\n");
+
+    /* Open group */
+    if((grp = H5Gopen2(file, argv[2], H5P_DEFAULT)) < 0)
+        ERROR;
+
+    /* Close */
+    if(H5Gclose(grp) < 0)
+        ERROR;
+    if(H5Fclose(file) < 0)
+        ERROR;
+    if(H5Pclose(fapl) < 0)
+        ERROR;
+
+    printf("Success\n");
+
+    (void)MPI_Finalize();
+    return 0;
+
+error:
+    H5E_BEGIN_TRY {
+        H5Gclose(grp);
+        H5Fclose(file);
+        H5Pclose(fapl);
+    } H5E_END_TRY;
+
+    (void)MPI_Finalize();
+    return 1;
+}
+