[svn-r17624] Description:

	Don't allow reads to change or add to the metadata accumulator, since
they might be speculative and could bring raw data into the metadata
accumulator.

Tested on:
        FreeBSD/32 6.3 (duty) in debug mode
        FreeBSD/64 6.3 (liberty) w/C++ & FORTRAN, in debug mode
        Linux/32 2.6 (jam) w/PGI compilers, w/default API=1.8.x,
                w/C++ & FORTRAN, w/threadsafe, in debug mode
        Linux/64-amd64 2.6 (smirom) w/Intel compilers, w/default API=1.6.x,
                w/C++ & FORTRAN, in production mode
        Solaris/32 2.10 (linew) w/deprecated symbols disabled, w/C++ & FORTRAN,
                w/szip filter, in production mode
        Linux/64-ia64 2.6 (cobalt) w/Intel compilers, w/C++ & FORTRAN,
                in production mode
        Linux/64-ia64 2.4 (tg-login3) w/parallel, w/FORTRAN, in debug mode
        Linux/64-amd64 2.6 (abe) w/parallel, w/FORTRAN, in production mode
        Mac OS X/32 10.6.1 (amazon) in debug mode
        Mac OS X/32 10.6.1 (amazon) w/C++ & FORTRAN, w/threadsafe,
                in production mode

1 files changed, 96 insertions, 0 deletions

diff --git a/test/gen_specmetaread.c b/test/gen_specmetaread.c
new file mode 100644
index 0000000..f489119
--- /dev/null
+++ b/test/gen_specmetaread.c
@@ -0,0 +1,96 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
+ * access to either file, you may request a copy from help@hdfgroup.org.     *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * Programmer:  Quincey Koziol <koziol@hdfgroup.org>
+ *              Thursday, October  8, 2009
+ *
+ * Purpose:	Create a file with a dataset who's raw data immediately follows
+ *      its object header, so that when the dataset is unlinked from its parent
+ *      group, a speculative read of the object header would get the raw data
+ *      into the metadata accumulator, "polluting" it.
+ *		To build the test file, this program MUST be compiled and linked with
+ *      the library on the trunk as of when this file is checked in.
+ */
+
+#include "hdf5.h"
+#include <assert.h>
+
+#define FILENAME        "specmetaread.h5"
+#define DIM             10
+
+int
+main(void)
+{
+    hid_t	fid;
+    hid_t	fapl;
+    hid_t       did;
+    hid_t 	space;
+    hsize_t     dim[1] = {DIM};
+    unsigned    data[DIM];
+    unsigned    u;
+    herr_t      ret;         /* Generic return value */
+
+    /* Initialize the data */
+    for(u = 0; u < DIM; u++)
+	data[u] = u;
+
+    /* Create a FAPL with the metadata and small data aggregators turned off */
+    fapl = H5Pcreate(H5P_FILE_ACCESS);
+    assert(fapl > 0);
+    ret = H5Pset_meta_block_size(fapl, (hsize_t)0);
+    assert(ret >= 0);
+    ret = H5Pset_small_data_block_size(fapl, (hsize_t)0);
+    assert(ret >= 0);
+
+    /* Create file */
+    fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl);
+    assert(fid > 0);
+
+    /* Close FAPL */
+    ret = H5Pclose(fapl);
+    assert(ret >= 0);
+
+    /* Create dataspace */
+    space = H5Screate_simple(1, dim, NULL);
+    assert(space > 0);
+
+    /* Create dataset #1 */
+    did = H5Dcreate2(fid, "dset1", H5T_NATIVE_UINT, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    assert(did > 0);
+    ret = H5Dwrite(did, H5T_NATIVE_UINT, H5S_ALL, H5S_ALL, H5P_DEFAULT, data);
+    assert(ret >= 0);
+    ret = H5Dclose(did);
+    assert(ret >= 0);
+
+    /* Create dataset #2 */
+    did = H5Dcreate2(fid, "dset2", H5T_NATIVE_UINT, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    assert(did > 0);
+    ret = H5Dwrite(did, H5T_NATIVE_UINT, H5S_ALL, H5S_ALL, H5P_DEFAULT, data);
+    assert(ret >= 0);
+    ret = H5Dclose(did);
+    assert(ret >= 0);
+
+    /* Close dataspace */
+    ret = H5Sclose(space);
+    assert(ret >= 0);
+
+    /* Close file */
+    ret = H5Fclose(fid);
+    assert(ret >= 0);
+
+    return 0;
+}
+