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* bpo-37337: Add _PyObject_CallMethodNoArgs() (GH-14267)Jeroen Demeyer2019-07-081-2/+2
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* bpo-36974: tp_print -> tp_vectorcall_offset and tp_reserved -> tp_as_async ↵Jeroen Demeyer2019-05-311-2/+2
| | | | | | | | | (GH-13464) Automatically replace tp_print -> tp_vectorcall_offset tp_compare -> tp_as_async tp_reserved -> tp_as_async
* bpo-36829: PyErr_WriteUnraisable() normalizes exception (GH-13507)Victor Stinner2019-05-221-2/+13
| | | | | | PyErr_WriteUnraisable() now creates a traceback object if there is no current traceback. Moreover, call PyErr_NormalizeException() and PyException_SetTraceback() to normalize the exception value. Ignore silently any error.
* bpo-35983: skip trashcan for subclasses (GH-11841)Jeroen Demeyer2019-05-101-2/+2
| | | | | Add new trashcan macros to deal with a double deallocation that could occur when the `tp_dealloc` of a subclass calls the `tp_dealloc` of a base class and that base class uses the trashcan mechanism. Patch by Jeroen Demeyer.
* bpo-33029: Fix signatures of getter and setter functions. (GH-10746)Serhiy Storchaka2018-11-271-1/+2
| | | Fix also return type for few other functions (clear, releasebuffer).
* bpo-35081: Rename internal headers (GH-10275)Victor Stinner2018-11-121-1/+1
| | | | | | | | | | | | | | Rename Include/internal/ headers: * pycore_hash.h -> pycore_pyhash.h * pycore_lifecycle.h -> pycore_pylifecycle.h * pycore_mem.h -> pycore_pymem.h * pycore_state.h -> pycore_pystate.h Add missing headers to Makefile.pre.in and PCbuild: * pycore_condvar.h. * pycore_hamt.h * pycore_pyhash.h
* bpo-35081: Add pycore_ prefix to internal header files (GH-10263)Victor Stinner2018-10-311-1/+1
| | | | | | | | | | | | | | | | | | | | * Rename Include/internal/ header files: * pyatomic.h -> pycore_atomic.h * ceval.h -> pycore_ceval.h * condvar.h -> pycore_condvar.h * context.h -> pycore_context.h * pygetopt.h -> pycore_getopt.h * gil.h -> pycore_gil.h * hamt.h -> pycore_hamt.h * hash.h -> pycore_hash.h * mem.h -> pycore_mem.h * pystate.h -> pycore_state.h * warnings.h -> pycore_warnings.h * PCbuild project, Makefile.pre.in, Modules/Setup: add the Include/internal/ directory to the search paths of header files. * Update includes. For example, replace #include "internal/mem.h" with #include "pycore_mem.h".
* bpo-34588: Fix an off-by-one error in traceback formatting. (GH-9077)Benjamin Peterson2018-09-101-14/+16
| | | | | | | | The recursive frame pruning code always undercounted the number of elided frames by one. That is, in the "[Previous line repeated N more times]" message, N would always be one too few. Near the recursive pruning cutoff, one frame could be silently dropped. That situation is demonstrated in the OP of the bug report. The fix is to start the identical frame counter at 1.
* bpo-33012: Fix invalid function cast warnings with gcc 8 for METH_NOARGS. ↵Siddhesh Poyarekar2018-04-291-1/+1
| | | | | | | | | (GH-6030) METH_NOARGS functions need only a single argument but they are cast into a PyCFunction, which takes two arguments. This triggers an invalid function cast warning in gcc8 due to the argument mismatch. Fix this by adding a dummy unused argument.
* bpo-30579: Allow TracebackType creation and tb_next mutation from Python ↵Nathaniel J. Smith2018-01-071-26/+123
| | | | | | | | | | | | | | | | | (GH-4793) Third party projects may wish to hide their own internal machinery in order to present more comprehensible tracebacks to end users (e.g. Jinja2 and Trio both do this). Previously such projects have had to rely on ctypes to do so: https://github.com/pallets/jinja/blob/fe3dadacdf4cf411d0a5b6bbd4d5234697a28af2/jinja2/debug.py#L345 https://github.com/python-trio/trio/blob/1e86b1aee8c0c759f6f239ae53a05d0d3963c629/trio/_core/_multierror.py#L296 This provides a Python level API for creating and modifying real Traceback objects, allowing tracebacks to be edited at runtime. Patch by Nathaniel Smith.
* bpo-31949: Fixed several issues in printing tracebacks ↵Serhiy Storchaka2017-11-151-51/+51
| | | | | | | | | | | | (PyTraceBack_Print()). (#4289) * Setting sys.tracebacklimit to 0 or less now suppresses printing tracebacks. * Setting sys.tracebacklimit to None now causes using the default limit. * Setting sys.tracebacklimit to an integer larger than LONG_MAX now means using the limit LONG_MAX rather than the default limit. * Fixed integer overflows in the case of more than 2**31 traceback items on Windows. * Fixed output errors handling.
* bpo-25658: Implement PEP 539 for Thread Specific Storage (TSS) API (GH-1362)Masayuki Yamamoto2017-10-061-1/+1
| | | | | | | | | See PEP 539 for details. Highlights of changes: - Add Thread Specific Storage (TSS) API - Document the Thread Local Storage (TLS) API as deprecated - Update code that used TLS API to use TSS API
* bpo-30860: Consolidate stateful runtime globals. (#3397)Eric Snow2017-09-081-0/+1
| | | | | | | * group the (stateful) runtime globals into various topical structs * consolidate the topical structs under a single top-level _PyRuntimeState struct * add a check-c-globals.py script that helps identify runtime globals Other globals are excluded (see globals.txt and check-c-globals.py).
* bpo-31370: Remove support for threads-less builds (#3385)Antoine Pitrou2017-09-071-16/+0
| | | | | | * Remove Setup.config * Always define WITH_THREAD for compatibility.
* bpo-6532: Make the thread id an unsigned integer. (#781)Serhiy Storchaka2017-03-231-1/+1
| | | | | | | | | | | * bpo-6532: Make the thread id an unsigned integer. From C API side the type of results of PyThread_start_new_thread() and PyThread_get_thread_ident(), the id parameter of PyThreadState_SetAsyncExc(), and the thread_id field of PyThreadState changed from "long" to "unsigned long". * Restore a check in thread_get_ident().
* Issue #23782: Fixed possible memory leak in _PyTraceback_Add() and exceptionSerhiy Storchaka2016-10-181-20/+26
|\ | | | | | | loss in PyTraceBack_Here().
| * Issue #23782: Fixed possible memory leak in _PyTraceback_Add() and exceptionSerhiy Storchaka2016-10-181-20/+26
| | | | | | | | loss in PyTraceBack_Here().
* | Avoid calling functions with an empty string as format stringVictor Stinner2016-09-061-2/+2
| | | | | | | | Directly pass NULL rather than an empty string.
* | Fix reference leak in tb_printinternal()Victor Stinner2016-08-201-0/+2
| | | | | | | | Issue #26823.
* | Issue #26823: Abbreviate recursive tracebacksNick Coghlan2016-08-151-4/+32
| | | | | | | | | | | | | | | | Large sections of repeated lines in tracebacks are now abbreviated as "[Previous line repeated {count} more times]" by both the traceback module and the builtin traceback rendering. Patch by Emanuel Barry.
* | Issue #27336: Fix compilation failures --without-threadsBerker Peksag2016-06-171-1/+1
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* | Rework _Py_DumpASCII() to make Coverity happyVictor Stinner2016-03-231-8/+8
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* | Issue #23848: Expose _Py_DumpHexadecimal()Victor Stinner2016-03-231-8/+9
| | | | | | | | This function will be reused by faulthandler.
* | faulthandler now works in non-Python threadsVictor Stinner2016-03-161-2/+47
| | | | | | | | | | | | | | | | | | | | | | Issue #26563: * Add _PyGILState_GetInterpreterStateUnsafe() function: the single PyInterpreterState used by this process' GILState implementation. * Enhance _Py_DumpTracebackThreads() to retrieve the interpreter state from autoInterpreterState in last resort. The function now accepts NULL for interp and current_tstate parameters. * test_faulthandler: fix a ResourceWarning when test is interrupted by CTRL+c
* | Fix compilation error of traceback.c on WindowsVictor Stinner2016-03-161-3/+3
| | | | | | | | Issue #26564.
* | Enhance and rewrite traceback dump C functionsVictor Stinner2016-03-151-53/+56
|/ | | | | | | | | | | | | Issue #26564: * Expose _Py_DumpASCII() and _Py_DumpDecimal() in traceback.h * Change the type of the second _Py_DumpASCII() parameter from int to unsigned long * Rewrite _Py_DumpDecimal() and dump_hexadecimal() to write directly characters in the expected order, avoid the need of reversing the string. * dump_hexadecimal() limits width to the size of the buffer * _Py_DumpASCII() does nothing if the object is not a Unicode string * dump_frame() wrtites "???" as the line number if the line number is negative
* Issue #24436: Added const qualifiers for char* arguments of _PyTraceback_Add.Serhiy Storchaka2015-06-211-1/+1
|\ | | | | | | Patch by Michael Ensslin.
| * Issue #24436: Added const qualifiers for char* arguments of _PyTraceback_Add.Serhiy Storchaka2015-06-211-1/+1
| | | | | | | | Patch by Michael Ensslin.
* | Issue #23524: Replace _PyVerify_fd function with calls to ↵Steve Dower2015-04-121-0/+2
| | | | | | | | _set_thread_local_invalid_parameter_handler.
* | Issue #23836: Use _Py_write_noraise() to retry on EINTR in _Py_DumpTraceback()Victor Stinner2015-04-011-8/+20
| | | | | | | | | | and _Py_DumpTracebackThreads(). Document also these functions to explain that the caller is responsible to call PyErr_CheckSignals().
* | Merge 3.4 (traceback)Victor Stinner2015-03-251-1/+8
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| * Issue #23571: If io.TextIOWrapper constructor fails in _Py_DisplaySourceLine(),Victor Stinner2015-03-251-1/+8
| | | | | | | | close the binary file to fix a resource warning.
* | (Merge 3.4) Issue #22762: Fix _Py_DisplaySourceLine(), clear the exception ifVictor Stinner2014-10-301-0/+1
|\ \ | |/ | | | | PyFile_GetLine() failed. Patch written by Xavier de Gaye.
| * Issue #22762: Fix _Py_DisplaySourceLine(), clear the exception ifVictor Stinner2014-10-301-0/+1
| | | | | | | | PyFile_GetLine() failed. Patch written by Xavier de Gaye.
* | Issue #22462: Fix pyexpat's creation of a dummy frame to make it appear in ↵Antoine Pitrou2014-10-081-0/+33
|\ \ | |/ | | | | | | | | exception tracebacks. Initial patch by Mark Shannon.
| * Issue #22462: Fix pyexpat's creation of a dummy frame to make it appear in ↵Antoine Pitrou2014-10-081-0/+33
| | | | | | | | | | | | exception tracebacks. Initial patch by Mark Shannon.
* | faulthandler: enhance dump_ascii() to escape also non-printable ASCIIVictor Stinner2014-10-031-4/+5
| | | | | | | | characters (U+0000..U+001f and U+007f).
* | Issue #22156: Fix "comparison between signed and unsigned integers" compilerVictor Stinner2014-08-151-1/+1
|/ | | | warnings in the Python/ subdirectory.
* Fix _Py_DisplaySourceLine(), if PyTokenizer_FindEncodingFilename() fails, clearVictor Stinner2013-12-191-0/+2
| | | | the exception to not call open() with an exception set.
* Issue #19512, #19515: remove shared identifiers, move identifiers where theyVictor Stinner2013-11-071-5/+6
| | | | | | | are used. Move also _Py_IDENTIFIER() defintions to the top in modified files to remove identifiers duplicated in the same file.
* Issue #19512: add some common identifiers to only create common strings once,Victor Stinner2013-11-061-1/+1
| | | | | | | instead of creating temporary Unicode string objects Add also more identifiers in pythonrun.c to avoid temporary Unicode string objets for the interactive interpreter.
* Issue 19306: Add extra hints to faulthandler stack dumps that they are ↵Guido van Rossum2013-10-211-8/+8
| | | | upside down.
* merge 3.3Benjamin Peterson2013-07-211-1/+1
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| * fix spacingBenjamin Peterson2013-07-211-1/+1
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* | merge 3.3Benjamin Peterson2013-07-211-2/+2
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| * let's not return NULL from functions that should return intsBenjamin Peterson2013-07-211-2/+2
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* | Check return value of lseek() in _Py_DisplaySourceLine().Christian Heimes2013-07-211-1/+7
|\ \ | |/ | | | | | | Also use portable SEEK_SET instead of 0. CID 1040639
| * Check return value of lseek() in _Py_DisplaySourceLine().Christian Heimes2013-07-211-1/+7
| | | | | | | | | | Also use portable SEEK_SET instead of 0. CID 1040639
* | Check return value of PyObject_AsFileDescriptor() in _Py_DisplaySourceLine() ↵Christian Heimes2013-07-201-0/+5
|\ \ | |/ | | | | | | | | for error CID 486768
| * Check return value of PyObject_AsFileDescriptor() in _Py_DisplaySourceLine() ↵Christian Heimes2013-07-201-0/+5
| | | | | | | | | | | | for error CID 486768
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://www.hdfgroup.org/licenses.               *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/* Programmer:     Quincey Koziol
 *               Thursday, April 24, 2008
 *
 * Purpose:    Abstract indexed (chunked) I/O functions.  The logical
 *        multi-dimensional dataspace is regularly partitioned into
 *        same-sized "chunks", the first of which is aligned with the
 *        logical origin.  The chunks are indexed by different methods,
 *        that map a chunk index to disk address.  Each chunk can be
 *              compressed independently and the chunks may move around in the
 *              file as their storage requirements change.
 *
 * Cache:    Disk I/O is performed in units of chunks and H5MF_alloc()
 *        contains code to optionally align chunks on disk block
 *        boundaries for performance.
 *
 *        The chunk cache is an extendible hash indexed by a function
 *        of storage B-tree address and chunk N-dimensional offset
 *        within the dataset.  Collisions are not resolved -- one of
 *        the two chunks competing for the hash slot must be preempted
 *        from the cache.  All entries in the hash also participate in
 *        a doubly-linked list and entries are penalized by moving them
 *        toward the front of the list.  When a new chunk is about to
 *        be added to the cache the heap is pruned by preempting
 *        entries near the front of the list to make room for the new
 *        entry which is added to the end of the list.
 */

/****************/
/* Module Setup */
/****************/

#include "H5Dmodule.h" /* This source code file is part of the H5D module */

/***********/
/* Headers */
/***********/
#include "H5private.h" /* Generic Functions            */
#ifdef H5_HAVE_PARALLEL
#include "H5ACprivate.h" /* Metadata cache            */
#endif                   /* H5_HAVE_PARALLEL */
#include "H5CXprivate.h" /* API Contexts                         */
#include "H5Dpkg.h"      /* Dataset functions            */
#include "H5Eprivate.h"  /* Error handling              */
#include "H5Fprivate.h"  /* File functions            */
#include "H5FLprivate.h" /* Free Lists                           */
#include "H5Iprivate.h"  /* IDs                      */
#include "H5MMprivate.h" /* Memory management            */
#include "H5MFprivate.h" /* File memory management               */
#include "H5PBprivate.h" /* Page Buffer	                         */
#include "H5VMprivate.h" /* Vector and array functions        */

/****************/
/* Local Macros */
/****************/

/* Macros for iterating over chunks to operate on */
#define H5D_CHUNK_GET_FIRST_NODE(map) (map->use_single ? (H5SL_node_t *)(1) : H5SL_first(map->sel_chunks))
#define H5D_CHUNK_GET_NODE_INFO(map, node)                                                                   \
    (map->use_single ? map->single_chunk_info : (H5D_chunk_info_t *)H5SL_item(node))
#define H5D_CHUNK_GET_NEXT_NODE(map, node) (map->use_single ? (H5SL_node_t *)NULL : H5SL_next(node))
#define H5D_CHUNK_GET_NODE_COUNT(map)      (map->use_single ? (size_t)1 : H5SL_count(map->sel_chunks))

/* Sanity check on chunk index types: commonly used by a lot of routines in this file */
#define H5D_CHUNK_STORAGE_INDEX_CHK(storage)                                                                 \
    HDassert((H5D_CHUNK_IDX_EARRAY == (storage)->idx_type && H5D_COPS_EARRAY == (storage)->ops) ||           \
             (H5D_CHUNK_IDX_FARRAY == (storage)->idx_type && H5D_COPS_FARRAY == (storage)->ops) ||           \
             (H5D_CHUNK_IDX_BT2 == (storage)->idx_type && H5D_COPS_BT2 == (storage)->ops) ||                 \
             (H5D_CHUNK_IDX_BTREE == (storage)->idx_type && H5D_COPS_BTREE == (storage)->ops) ||             \
             (H5D_CHUNK_IDX_SINGLE == (storage)->idx_type && H5D_COPS_SINGLE == (storage)->ops) ||           \
             (H5D_CHUNK_IDX_NONE == (storage)->idx_type && H5D_COPS_NONE == (storage)->ops));

/*
 * Feature: If this constant is defined then every cache preemption and load
 *        causes a character to be printed on the standard error stream:
 *
 *     `.': Entry was preempted because it has been completely read or
 *        completely written but not partially read and not partially
 *        written. This is often a good reason for preemption because such
 *        a chunk will be unlikely to be referenced in the near future.
 *
 *     `:': Entry was preempted because it hasn't been used recently.
 *
 *     `#': Entry was preempted because another chunk collided with it. This
 *        is usually a relatively bad thing.  If there are too many of
 *        these then the number of entries in the cache can be increased.
 *
 *       c: Entry was preempted because the file is closing.
 *
 *     w: A chunk read operation was eliminated because the library is
 *        about to write new values to the entire chunk.  This is a good
 *        thing, especially on files where the chunk size is the same as
 *        the disk block size, chunks are aligned on disk block boundaries,
 *        and the operating system can also eliminate a read operation.
 */

/*#define H5D_CHUNK_DEBUG */

/* Flags for the "edge_chunk_state" field below */
#define H5D_RDCC_DISABLE_FILTERS 0x01U /* Disable filters on this chunk */
#define H5D_RDCC_NEWLY_DISABLED_FILTERS                                                                      \
    0x02U /* Filters have been disabled since                                                                \
           * the last flush */

/******************/
/* Local Typedefs */
/******************/

/* Raw data chunks are cached.  Each entry in the cache is: */
typedef struct H5D_rdcc_ent_t {
    hbool_t                locked;                   /*entry is locked in cache        */
    hbool_t                dirty;                    /*needs to be written to disk?        */
    hbool_t                deleted;                  /*chunk about to be deleted        */
    unsigned               edge_chunk_state;         /*states related to edge chunks (see above) */
    hsize_t                scaled[H5O_LAYOUT_NDIMS]; /*scaled chunk 'name' (coordinates) */
    uint32_t               rd_count;                 /*bytes remaining to be read        */
    uint32_t               wr_count;                 /*bytes remaining to be written        */
    H5F_block_t            chunk_block;              /*offset/length of chunk in file        */
    hsize_t                chunk_idx;                /*index of chunk in dataset             */
    uint8_t *              chunk;                    /*the unfiltered chunk data        */
    unsigned               idx;                      /*index in hash table            */
    struct H5D_rdcc_ent_t *next;                     /*next item in doubly-linked list    */
    struct H5D_rdcc_ent_t *prev;                     /*previous item in doubly-linked list    */
    struct H5D_rdcc_ent_t *tmp_next;                 /*next item in temporary doubly-linked list */
    struct H5D_rdcc_ent_t *tmp_prev;                 /*previous item in temporary doubly-linked list */
} H5D_rdcc_ent_t;
typedef H5D_rdcc_ent_t *H5D_rdcc_ent_ptr_t; /* For free lists */

/* Callback info for iteration to prune chunks */
typedef struct H5D_chunk_it_ud1_t {
    H5D_chunk_common_ud_t     common;          /* Common info for B-tree user data (must be first) */
    const H5D_chk_idx_info_t *idx_info;        /* Chunked index info */
    const H5D_io_info_t *     io_info;         /* I/O info for dataset operation */
    const hsize_t *           space_dim;       /* New dataset dimensions    */
    const hbool_t *           shrunk_dim;      /* Dimensions which have been shrunk */
    H5S_t *                   chunk_space;     /* Dataspace for a chunk */
    uint32_t                  elmts_per_chunk; /* Elements in chunk */
    hsize_t *                 hyper_start;     /* Starting location of hyperslab */
    H5D_fill_buf_info_t       fb_info;         /* Dataset's fill buffer info */
    hbool_t                   fb_info_init;    /* Whether the fill value buffer has been initialized */
} H5D_chunk_it_ud1_t;

/* Callback info for iteration to obtain chunk address and the index of the chunk for all chunks in the
 * B-tree. */
typedef struct H5D_chunk_it_ud2_t {
    /* down */
    H5D_chunk_common_ud_t common; /* Common info for B-tree user data (must be first) */

    /* up */
    haddr_t *chunk_addr; /* Array of chunk addresses to fill in */
} H5D_chunk_it_ud2_t;

/* Callback info for iteration to copy data */
typedef struct H5D_chunk_it_ud3_t {
    H5D_chunk_common_ud_t common;       /* Common info for B-tree user data (must be first) */
    H5F_t *               file_src;     /* Source file for copy */
    H5D_chk_idx_info_t *  idx_info_dst; /* Dest. chunk index info object */
    void *                buf;          /* Buffer to hold chunk data for read/write */
    void *                bkg;          /* Buffer for background information during type conversion */
    size_t                buf_size;     /* Buffer size */
    hbool_t               do_convert;   /* Whether to perform type conversions */

    /* needed for converting variable-length data */
    hid_t        tid_src;          /* Datatype ID for source datatype */
    hid_t        tid_dst;          /* Datatype ID for destination datatype */
    hid_t        tid_mem;          /* Datatype ID for memory datatype */
    const H5T_t *dt_src;           /* Source datatype */
    H5T_path_t * tpath_src_mem;    /* Datatype conversion path from source file to memory */
    H5T_path_t * tpath_mem_dst;    /* Datatype conversion path from memory to dest. file */
    void *       reclaim_buf;      /* Buffer for reclaiming data */
    size_t       reclaim_buf_size; /* Reclaim buffer size */
    uint32_t     nelmts;           /* Number of elements in buffer */
    H5S_t *      buf_space;        /* Dataspace describing buffer */

    /* needed for compressed variable-length data */
    const H5O_pline_t *pline;      /* Filter pipeline */
    unsigned           dset_ndims; /* Number of dimensions in dataset */
    const hsize_t *    dset_dims;  /* Dataset dimensions */

    /* needed for copy object pointed by refs */
    H5O_copy_t *cpy_info; /* Copy options */

    /* needed for getting raw data from chunk cache */
    hbool_t  chunk_in_cache;
    uint8_t *chunk; /* the unfiltered chunk data        */
} H5D_chunk_it_ud3_t;

/* Callback info for iteration to dump index */
typedef struct H5D_chunk_it_ud4_t {
    FILE *    stream;           /* Output stream    */
    hbool_t   header_displayed; /* Node's header is displayed? */
    unsigned  ndims;            /* Number of dimensions for chunk/dataset */
    uint32_t *chunk_dim;        /* Chunk dimensions */
} H5D_chunk_it_ud4_t;

/* Callback info for iteration to format convert chunks */
typedef struct H5D_chunk_it_ud5_t {
    H5D_chk_idx_info_t *new_idx_info; /* Dest. chunk index info object */
    unsigned            dset_ndims;   /* Number of dimensions in dataset */
    hsize_t *           dset_dims;    /* Dataset dimensions */
} H5D_chunk_it_ud5_t;

/* Callback info for nonexistent readvv operation */
typedef struct H5D_chunk_readvv_ud_t {
    unsigned char *rbuf; /* Read buffer to initialize */
    const H5D_t *  dset; /* Dataset to operate on */
} H5D_chunk_readvv_ud_t;

/* Typedef for chunk info iterator callback */
typedef struct H5D_chunk_info_iter_ud_t {
    hsize_t  scaled[H5O_LAYOUT_NDIMS]; /* Logical offset of the chunk */
    hsize_t  ndims;                    /* Number of dimensions in the dataset */
    uint32_t nbytes;                   /* Size of stored data in the chunk */
    unsigned filter_mask;              /* Excluded filters */
    haddr_t  chunk_addr;               /* Address of the chunk in file */
    hsize_t  chunk_idx;                /* Chunk index, where the iteration needs to stop */
    hsize_t  curr_idx;                 /* Current index, where the iteration is */
    unsigned idx_hint;                 /* Index of chunk in cache, if present */
    hbool_t  found;                    /* Whether the chunk was found */
} H5D_chunk_info_iter_ud_t;

/* Callback info for file selection iteration */
typedef struct H5D_chunk_file_iter_ud_t {
    H5D_chunk_map_t *fm; /* File->memory chunk mapping info */
#ifdef H5_HAVE_PARALLEL
    const H5D_io_info_t *io_info; /* I/O info for operation */
#endif                            /* H5_HAVE_PARALLEL */
} H5D_chunk_file_iter_ud_t;

#ifdef H5_HAVE_PARALLEL
/* information to construct a collective I/O operation for filling chunks */
typedef struct H5D_chunk_coll_fill_info_t {
    size_t num_chunks; /* Number of chunks in the write operation */
    struct chunk_coll_fill_info {
        haddr_t addr;       /* File address of the chunk */
        size_t  chunk_size; /* Size of the chunk in the file */
        hbool_t unfiltered_partial_chunk;
    } * chunk_info;
} H5D_chunk_coll_fill_info_t;
#endif /* H5_HAVE_PARALLEL */

typedef struct H5D_chunk_iter_ud_t {
    H5D_chunk_iter_op_t op;      /* User defined callback */
    void *              op_data; /* User data for user defined callback */
} H5D_chunk_iter_ud_t;

/********************/
/* Local Prototypes */
/********************/

/* Chunked layout operation callbacks */
static herr_t H5D__chunk_construct(H5F_t *f, H5D_t *dset);
static herr_t H5D__chunk_init(H5F_t *f, const H5D_t *dset, hid_t dapl_id);
static herr_t H5D__chunk_io_init(H5D_io_info_t *io_info, const H5D_type_info_t *type_info, hsize_t nelmts,
                                 H5S_t *file_space, H5S_t *mem_space, H5D_chunk_map_t *fm);
static herr_t H5D__chunk_io_init_selections(const H5D_io_info_t *io_info, const H5D_type_info_t *type_info,
                                            H5D_chunk_map_t *fm);
static herr_t H5D__chunk_read(H5D_io_info_t *io_info, const H5D_type_info_t *type_info, hsize_t nelmts,
                              H5S_t *file_space, H5S_t *mem_space, H5D_chunk_map_t *fm);
static herr_t H5D__chunk_write(H5D_io_info_t *io_info, const H5D_type_info_t *type_info, hsize_t nelmts,
                               H5S_t *file_space, H5S_t *mem_space, H5D_chunk_map_t *fm);
static herr_t H5D__chunk_flush(H5D_t *dset);
static herr_t H5D__chunk_io_term(const H5D_chunk_map_t *fm);
static herr_t H5D__chunk_dest(H5D_t *dset);

/* Chunk query operation callbacks */
static int H5D__get_num_chunks_cb(const H5D_chunk_rec_t *chunk_rec, void *_udata);
static int H5D__get_chunk_info_cb(const H5D_chunk_rec_t *chunk_rec, void *_udata);
static int H5D__get_chunk_info_by_coord_cb(const H5D_chunk_rec_t *chunk_rec, void *_udata);
static int H5D__chunk_iter_cb(const H5D_chunk_rec_t *chunk_rec, void *udata);

/* "Nonexistent" layout operation callback */
static ssize_t H5D__nonexistent_readvv(const H5D_io_info_t *io_info, size_t chunk_max_nseq,
                                       size_t *chunk_curr_seq, size_t chunk_len_arr[],
                                       hsize_t chunk_offset_arr[], size_t mem_max_nseq, size_t *mem_curr_seq,
                                       size_t mem_len_arr[], hsize_t mem_offset_arr[]);

/* Format convert cb */
static int H5D__chunk_format_convert_cb(const H5D_chunk_rec_t *chunk_rec, void *_udata);

/* Helper routines */
static herr_t   H5D__chunk_set_info_real(H5O_layout_chunk_t *layout, unsigned ndims, const hsize_t *curr_dims,
                                         const hsize_t *max_dims);
static herr_t   H5D__chunk_cinfo_cache_reset(H5D_chunk_cached_t *last);
static herr_t   H5D__chunk_cinfo_cache_update(H5D_chunk_cached_t *last, const H5D_chunk_ud_t *udata);
static hbool_t  H5D__chunk_cinfo_cache_found(const H5D_chunk_cached_t *last, H5D_chunk_ud_t *udata);
static herr_t   H5D__free_chunk_info(void *item, void *key, void *opdata);
static herr_t   H5D__create_chunk_map_single(H5D_chunk_map_t *fm, const H5D_io_info_t *io_info);
static herr_t   H5D__create_chunk_file_map_all(H5D_chunk_map_t *fm, const H5D_io_info_t *io_info);
static herr_t   H5D__create_chunk_file_map_hyper(H5D_chunk_map_t *fm, const H5D_io_info_t *io_info);
static herr_t   H5D__create_chunk_mem_map_1d(const H5D_chunk_map_t *fm);
static herr_t   H5D__create_chunk_mem_map_hyper(const H5D_chunk_map_t *fm);
static herr_t   H5D__chunk_file_cb(void *elem, const H5T_t *type, unsigned ndims, const hsize_t *coords,
                                   void *fm);
static herr_t   H5D__chunk_mem_cb(void *elem, const H5T_t *type, unsigned ndims, const hsize_t *coords,
                                  void *fm);
static htri_t   H5D__chunk_may_use_select_io(const H5D_io_info_t *io_info);
static unsigned H5D__chunk_hash_val(const H5D_shared_t *shared, const hsize_t *scaled);
static herr_t   H5D__chunk_flush_entry(const H5D_t *dset, H5D_rdcc_ent_t *ent, hbool_t reset);
static herr_t   H5D__chunk_cache_evict(const H5D_t *dset, H5D_rdcc_ent_t *ent, hbool_t flush);
static void *   H5D__chunk_lock(const H5D_io_info_t *io_info, H5D_chunk_ud_t *udata, hbool_t relax,
                                hbool_t prev_unfilt_chunk);
static herr_t   H5D__chunk_unlock(const H5D_io_info_t *io_info, const H5D_chunk_ud_t *udata, hbool_t dirty,
                                  void *chunk, uint32_t naccessed);
static herr_t   H5D__chunk_cache_prune(const H5D_t *dset, size_t size);
static herr_t   H5D__chunk_prune_fill(H5D_chunk_it_ud1_t *udata, hbool_t new_unfilt_chunk);
#ifdef H5_HAVE_PARALLEL
static herr_t H5D__chunk_collective_fill(const H5D_t *dset, H5D_chunk_coll_fill_info_t *chunk_fill_info,
                                         const void *fill_buf, const void *partial_chunk_fill_buf);
static int    H5D__chunk_cmp_coll_fill_info(const void *_entry1, const void *_entry2);
#endif /* H5_HAVE_PARALLEL */

/* Debugging helper routine callback */
static int H5D__chunk_dump_index_cb(const H5D_chunk_rec_t *chunk_rec, void *_udata);

/*********************/
/* Package Variables */
/*********************/

/* Chunked storage layout I/O ops */
const H5D_layout_ops_t H5D_LOPS_CHUNK[1] = {{
    H5D__chunk_construct,      /* construct */
    H5D__chunk_init,           /* init */
    H5D__chunk_is_space_alloc, /* is_space_alloc */
    H5D__chunk_is_data_cached, /* is_data_cached */
    H5D__chunk_io_init,        /* io_init */
    H5D__chunk_read,           /* ser_read */
    H5D__chunk_write,          /* ser_write */
#ifdef H5_HAVE_PARALLEL
    H5D__chunk_collective_read,  /* par_read */
    H5D__chunk_collective_write, /* par_write */
#endif
    NULL,               /* readvv */
    NULL,               /* writevv */
    H5D__chunk_flush,   /* flush */
    H5D__chunk_io_term, /* io_term */
    H5D__chunk_dest     /* dest */
}};

/*******************/
/* Local Variables */
/*******************/

/* "nonexistent" storage layout I/O ops */
const H5D_layout_ops_t H5D_LOPS_NONEXISTENT[1] = {{NULL, NULL, NULL, NULL, NULL, NULL, NULL,
#ifdef H5_HAVE_PARALLEL
                                                   NULL, NULL,
#endif /* H5_HAVE_PARALLEL */
                                                   H5D__nonexistent_readvv, NULL, NULL, NULL, NULL}};

/* Declare a free list to manage the H5F_rdcc_ent_ptr_t sequence information */
H5FL_SEQ_DEFINE_STATIC(H5D_rdcc_ent_ptr_t);

/* Declare a free list to manage H5D_rdcc_ent_t objects */
H5FL_DEFINE_STATIC(H5D_rdcc_ent_t);

/* Declare a free list to manage the H5D_chunk_info_t struct */
H5FL_DEFINE(H5D_chunk_info_t);

/* Declare a free list to manage the chunk sequence information */
H5FL_BLK_DEFINE_STATIC(chunk);

/* Declare extern free list to manage the H5S_sel_iter_t struct */
H5FL_EXTERN(H5S_sel_iter_t);

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_direct_write
 *
 * Purpose:    Internal routine to write a chunk directly into the file.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Raymond Lu
 *              30 July 2012
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_direct_write(const H5D_t *dset, uint32_t filters, hsize_t *offset, uint32_t data_size,
                        const void *buf)
{
    const H5O_layout_t *layout = &(dset->shared->layout); /* Dataset layout */
    H5D_chunk_ud_t      udata;                            /* User data for querying chunk info */
    H5F_block_t         old_chunk;                        /* Offset/length of old chunk */
    H5D_chk_idx_info_t  idx_info;                         /* Chunked index info */
    hsize_t             scaled[H5S_MAX_RANK];             /* Scaled coordinates for this chunk */
    hbool_t             need_insert = FALSE;   /* Whether the chunk needs to be inserted into the index */
    herr_t              ret_value   = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE_TAG(dset->oloc.addr)

    /* Sanity checks */
    HDassert(layout->type == H5D_CHUNKED);

    /* Allocate dataspace and initialize it if it hasn't been. */
    if (!H5D__chunk_is_space_alloc(&layout->storage)) {
        H5D_io_info_t io_info; /* to hold the dset info */

        io_info.dset = dset;
        io_info.f_sh = H5F_SHARED(dset->oloc.file);

        /* Allocate storage */
        if (H5D__alloc_storage(&io_info, H5D_ALLOC_WRITE, FALSE, NULL) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to initialize storage")
    }

    /* Calculate the index of this chunk */
    H5VM_chunk_scaled(dset->shared->ndims, offset, layout->u.chunk.dim, scaled);
    scaled[dset->shared->ndims] = 0;

    /* Find out the file address of the chunk (if any) */
    if (H5D__chunk_lookup(dset, scaled, &udata) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "error looking up chunk address")

    /* Sanity check */
    HDassert((H5F_addr_defined(udata.chunk_block.offset) && udata.chunk_block.length > 0) ||
             (!H5F_addr_defined(udata.chunk_block.offset) && udata.chunk_block.length == 0));

    /* Set the file block information for the old chunk */
    /* (Which is only defined when overwriting an existing chunk) */
    old_chunk.offset = udata.chunk_block.offset;
    old_chunk.length = udata.chunk_block.length;

    /* Check if the chunk needs to be inserted (it also could exist already
     *      and the chunk allocate operation could resize it)
     */

    /* Compose chunked index info struct */
    idx_info.f       = dset->oloc.file;
    idx_info.pline   = &(dset->shared->dcpl_cache.pline);
    idx_info.layout  = &(dset->shared->layout.u.chunk);
    idx_info.storage = &(dset->shared->layout.storage.u.chunk);

    /* Set up the size of chunk for user data */
    udata.chunk_block.length = data_size;

    if (0 == idx_info.pline->nused && H5F_addr_defined(old_chunk.offset))
        /* If there are no filters and we are overwriting the chunk we can just set values */
        need_insert = FALSE;
    else {
        /* Otherwise, create the chunk it if it doesn't exist, or reallocate the chunk
         * if its size has changed.
         */
        if (H5D__chunk_file_alloc(&idx_info, &old_chunk, &udata.chunk_block, &need_insert, scaled) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "unable to allocate chunk")

        /* Cache the new chunk information */
        H5D__chunk_cinfo_cache_update(&dset->shared->cache.chunk.last, &udata);
    } /* end else */

    /* Make sure the address of the chunk is returned. */
    if (!H5F_addr_defined(udata.chunk_block.offset))
        HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "chunk address isn't defined")

    /* Evict the (old) entry from the cache if present, but do not flush
     * it to disk */
    if (UINT_MAX != udata.idx_hint) {
        const H5D_rdcc_t *rdcc = &(dset->shared->cache.chunk); /*raw data chunk cache */

        if (H5D__chunk_cache_evict(dset, rdcc->slot[udata.idx_hint], FALSE) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTREMOVE, FAIL, "unable to evict chunk")
    } /* end if */

    /* Write the data to the file */
    if (H5F_shared_block_write(H5F_SHARED(dset->oloc.file), H5FD_MEM_DRAW, udata.chunk_block.offset,
                               data_size, buf) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_WRITEERROR, FAIL, "unable to write raw data to file")

    /* Insert the chunk record into the index */
    if (need_insert && layout->storage.u.chunk.ops->insert) {
        /* Set the chunk's filter mask to the new settings */
        udata.filter_mask = filters;

        if ((layout->storage.u.chunk.ops->insert)(&idx_info, &udata, dset) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTINSERT, FAIL, "unable to insert chunk addr into index")
    } /* end if */

done:
    FUNC_LEAVE_NOAPI_TAG(ret_value)
} /* end H5D__chunk_direct_write() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_direct_read
 *
 * Purpose:     Internal routine to read a chunk directly from the file.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Matthew Strong (GE Healthcare)
 *              14 February 2016
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_direct_read(const H5D_t *dset, hsize_t *offset, uint32_t *filters, void *buf)
{
    const H5O_layout_t *layout = &(dset->shared->layout);      /* Dataset layout */
    const H5D_rdcc_t *  rdcc   = &(dset->shared->cache.chunk); /* raw data chunk cache */
    H5D_chunk_ud_t      udata;                                 /* User data for querying chunk info */
    hsize_t             scaled[H5S_MAX_RANK];                  /* Scaled coordinates for this chunk */
    herr_t              ret_value = SUCCEED;                   /* Return value */

    FUNC_ENTER_PACKAGE_TAG(dset->oloc.addr)

    /* Check args */
    HDassert(dset && H5D_CHUNKED == layout->type);
    HDassert(offset);
    HDassert(filters);
    HDassert(buf);

    *filters = 0;

    /* Allocate dataspace and initialize it if it hasn't been. */
    if (!H5D__chunk_is_space_alloc(&layout->storage) && !H5D__chunk_is_data_cached(dset->shared))
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "storage is not initialized")

    /* Calculate the index of this chunk */
    H5VM_chunk_scaled(dset->shared->ndims, offset, layout->u.chunk.dim, scaled);
    scaled[dset->shared->ndims] = 0;

    /* Reset fields about the chunk we are looking for */
    udata.filter_mask        = 0;
    udata.chunk_block.offset = HADDR_UNDEF;
    udata.chunk_block.length = 0;
    udata.idx_hint           = UINT_MAX;

    /* Find out the file address of the chunk */
    if (H5D__chunk_lookup(dset, scaled, &udata) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "error looking up chunk address")

    /* Sanity check */
    HDassert((H5F_addr_defined(udata.chunk_block.offset) && udata.chunk_block.length > 0) ||
             (!H5F_addr_defined(udata.chunk_block.offset) && udata.chunk_block.length == 0));

    /* Check if the requested chunk exists in the chunk cache */
    if (UINT_MAX != udata.idx_hint) {
        H5D_rdcc_ent_t *ent = rdcc->slot[udata.idx_hint];
        hbool_t         flush;

        /* Sanity checks  */
        HDassert(udata.idx_hint < rdcc->nslots);
        HDassert(rdcc->slot[udata.idx_hint]);

        flush = (ent->dirty == TRUE) ? TRUE : FALSE;

        /* Flush the chunk to disk and clear the cache entry */
        if (H5D__chunk_cache_evict(dset, rdcc->slot[udata.idx_hint], flush) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTREMOVE, FAIL, "unable to evict chunk")

        /* Reset fields about the chunk we are looking for */
        udata.filter_mask        = 0;
        udata.chunk_block.offset = HADDR_UNDEF;
        udata.chunk_block.length = 0;
        udata.idx_hint           = UINT_MAX;

        /* Get the new file address / chunk size after flushing */
        if (H5D__chunk_lookup(dset, scaled, &udata) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "error looking up chunk address")
    }

    /* Make sure the address of the chunk is returned. */
    if (!H5F_addr_defined(udata.chunk_block.offset))
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "chunk address isn't defined")

    /* Read the chunk data into the supplied buffer */
    if (H5F_shared_block_read(H5F_SHARED(dset->oloc.file), H5FD_MEM_DRAW, udata.chunk_block.offset,
                              udata.chunk_block.length, buf) < 0)
        HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "unable to read raw data chunk")

    /* Return the filter mask */
    *filters = udata.filter_mask;

done:
    FUNC_LEAVE_NOAPI_TAG(ret_value)
} /* end H5D__chunk_direct_read() */

/*-------------------------------------------------------------------------
 * Function:    H5D__get_chunk_storage_size
 *
 * Purpose:     Internal routine to read the storage size of a chunk on disk.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Matthew Strong (GE Healthcare)
 *              20 October 2016
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__get_chunk_storage_size(H5D_t *dset, const hsize_t *offset, hsize_t *storage_size)
{
    const H5O_layout_t *layout = &(dset->shared->layout);      /* Dataset layout */
    const H5D_rdcc_t *  rdcc   = &(dset->shared->cache.chunk); /* raw data chunk cache */
    hsize_t             scaled[H5S_MAX_RANK];                  /* Scaled coordinates for this chunk */
    H5D_chunk_ud_t      udata;                                 /* User data for querying chunk info */
    herr_t              ret_value = SUCCEED;                   /* Return value */

    FUNC_ENTER_PACKAGE_TAG(dset->oloc.addr)

    /* Check args */
    HDassert(dset && H5D_CHUNKED == layout->type);
    HDassert(offset);
    HDassert(storage_size);

    /* Allocate dataspace and initialize it if it hasn't been. */
    if (!(*layout->ops->is_space_alloc)(&layout->storage))
        HGOTO_DONE(SUCCEED)

    /* Calculate the index of this chunk */
    H5VM_chunk_scaled(dset->shared->ndims, offset, layout->u.chunk.dim, scaled);
    scaled[dset->shared->ndims] = 0;

    /* Reset fields about the chunk we are looking for */
    udata.chunk_block.offset = HADDR_UNDEF;
    udata.chunk_block.length = 0;
    udata.idx_hint           = UINT_MAX;

    /* Find out the file address of the chunk */
    if (H5D__chunk_lookup(dset, scaled, &udata) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "error looking up chunk address")

    /* Sanity check */
    HDassert((H5F_addr_defined(udata.chunk_block.offset) && udata.chunk_block.length > 0) ||
             (!H5F_addr_defined(udata.chunk_block.offset) && udata.chunk_block.length == 0));

    /* The requested chunk is not in cache or on disk */
    if (!H5F_addr_defined(udata.chunk_block.offset) && UINT_MAX == udata.idx_hint)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "chunk storage is not allocated")

    /* Check if there are filters registered to the dataset */
    if (dset->shared->dcpl_cache.pline.nused > 0) {
        /* Check if the requested chunk exists in the chunk cache */
        if (UINT_MAX != udata.idx_hint) {
            H5D_rdcc_ent_t *ent = rdcc->slot[udata.idx_hint];

            /* Sanity checks  */
            HDassert(udata.idx_hint < rdcc->nslots);
            HDassert(rdcc->slot[udata.idx_hint]);

            /* If the cached chunk is dirty, it must be flushed to get accurate size */
            if (ent->dirty == TRUE) {
                /* Flush the chunk to disk and clear the cache entry */
                if (H5D__chunk_cache_evict(dset, rdcc->slot[udata.idx_hint], TRUE) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTREMOVE, FAIL, "unable to evict chunk")

                /* Reset fields about the chunk we are looking for */
                udata.chunk_block.offset = HADDR_UNDEF;
                udata.chunk_block.length = 0;
                udata.idx_hint           = UINT_MAX;

                /* Get the new file address / chunk size after flushing */
                if (H5D__chunk_lookup(dset, scaled, &udata) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "error looking up chunk address")
            }
        }

        /* Make sure the address of the chunk is returned. */
        if (!H5F_addr_defined(udata.chunk_block.offset))
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "chunk address isn't defined")

        /* Return the chunk size on disk */
        *storage_size = udata.chunk_block.length;
    }
    /* There are no filters registered, return the chunk size from the storage layout */
    else
        *storage_size = dset->shared->layout.u.chunk.size;

done:
    FUNC_LEAVE_NOAPI_TAG(ret_value)
} /* H5D__get_chunk_storage_size */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_set_info_real
 *
 * Purpose:    Internal routine to set the information about chunks for a dataset
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *              Tuesday, June 30, 2009
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_set_info_real(H5O_layout_chunk_t *layout, unsigned ndims, const hsize_t *curr_dims,
                         const hsize_t *max_dims)
{
    unsigned u;                   /* Local index variable */
    herr_t   ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(layout);
    HDassert(ndims > 0);
    HDassert(curr_dims);

    /* Compute the # of chunks in dataset dimensions */
    for (u = 0, layout->nchunks = 1, layout->max_nchunks = 1; u < ndims; u++) {
        /* Round up to the next integer # of chunks, to accommodate partial chunks */
        layout->chunks[u] = ((curr_dims[u] + layout->dim[u]) - 1) / layout->dim[u];
        if (H5S_UNLIMITED == max_dims[u])
            layout->max_chunks[u] = H5S_UNLIMITED;
        else {
            /* Sanity check */
            if (layout->dim[u] == 0)
                HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "dimension size must be > 0, dim = %u ", u)

            layout->max_chunks[u] = ((max_dims[u] + layout->dim[u]) - 1) / layout->dim[u];
        }

        /* Accumulate the # of chunks */
        layout->nchunks *= layout->chunks[u];
        layout->max_nchunks *= layout->max_chunks[u];
    } /* end for */

    /* Get the "down" sizes for each dimension */
    H5VM_array_down(ndims, layout->chunks, layout->down_chunks);
    H5VM_array_down(ndims, layout->max_chunks, layout->max_down_chunks);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_set_info_real() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_set_info
 *
 * Purpose:    Sets the information about chunks for a dataset
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *              Tuesday, June 30, 2009
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_set_info(const H5D_t *dset)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(dset);

    /* Set the base layout information */
    if (H5D__chunk_set_info_real(&dset->shared->layout.u.chunk, dset->shared->ndims, dset->shared->curr_dims,
                                 dset->shared->max_dims) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "can't set layout's chunk info")

    /* Call the index's "resize" callback */
    if (dset->shared->layout.storage.u.chunk.ops->resize &&
        (dset->shared->layout.storage.u.chunk.ops->resize)(&dset->shared->layout.u.chunk) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "unable to resize chunk index information")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_set_info() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_set_sizes
 *
 * Purpose:     Sets chunk and type sizes.
 *
 * Return:      SUCCEED/FAIL
 *
 * Programmer:    Dana Robinson
 *              December 2015
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_set_sizes(H5D_t *dset)
{
    uint64_t chunk_size;            /* Size of chunk in bytes */
    unsigned max_enc_bytes_per_dim; /* Max. number of bytes required to encode this dimension */
    unsigned u;                     /* Iterator */
    herr_t   ret_value = SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    HDassert(dset);

    /* Increment # of chunk dimensions, to account for datatype size as last element */
    dset->shared->layout.u.chunk.ndims++;

    /* Set the last dimension of the chunk size to the size of the datatype */
    dset->shared->layout.u.chunk.dim[dset->shared->layout.u.chunk.ndims - 1] =
        (uint32_t)H5T_GET_SIZE(dset->shared->type);

    /* Compute number of bytes to use for encoding chunk dimensions */
    max_enc_bytes_per_dim = 0;
    for (u = 0; u < (unsigned)dset->shared->layout.u.chunk.ndims; u++) {
        unsigned enc_bytes_per_dim; /* Number of bytes required to encode this dimension */

        /* Get encoded size of dim, in bytes */
        enc_bytes_per_dim = (H5VM_log2_gen(dset->shared->layout.u.chunk.dim[u]) + 8) / 8;

        /* Check if this is the largest value so far */
        if (enc_bytes_per_dim > max_enc_bytes_per_dim)
            max_enc_bytes_per_dim = enc_bytes_per_dim;
    } /* end for */
    HDassert(max_enc_bytes_per_dim > 0 && max_enc_bytes_per_dim <= 8);
    dset->shared->layout.u.chunk.enc_bytes_per_dim = max_enc_bytes_per_dim;

    /* Compute and store the total size of a chunk */
    /* (Use 64-bit value to ensure that we can detect >4GB chunks) */
    for (u = 1, chunk_size = (uint64_t)dset->shared->layout.u.chunk.dim[0];
         u < dset->shared->layout.u.chunk.ndims; u++)
        chunk_size *= (uint64_t)dset->shared->layout.u.chunk.dim[u];

    /* Check for chunk larger than can be represented in 32-bits */
    /* (Chunk size is encoded in 32-bit value in v1 B-tree records) */
    if (chunk_size > (uint64_t)0xffffffff)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "chunk size must be < 4GB")

    H5_CHECKED_ASSIGN(dset->shared->layout.u.chunk.size, uint32_t, chunk_size, uint64_t);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_set_sizes */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_construct
 *
 * Purpose:    Constructs new chunked layout information for dataset
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *              Thursday, May 22, 2008
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_construct(H5F_t H5_ATTR_UNUSED *f, H5D_t *dset)
{
    unsigned u;                   /* Local index variable */
    herr_t   ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(f);
    HDassert(dset);

    /* Check for invalid chunk dimension rank */
    if (0 == dset->shared->layout.u.chunk.ndims)
        HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "no chunk information set?")
    if (dset->shared->layout.u.chunk.ndims != dset->shared->ndims)
        HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "dimensionality of chunks doesn't match the dataspace")

    /* Set chunk sizes */
    if (H5D__chunk_set_sizes(dset) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "unable to set chunk sizes")
    HDassert((unsigned)(dset->shared->layout.u.chunk.ndims) <= NELMTS(dset->shared->layout.u.chunk.dim));

    /* Chunked storage is not compatible with external storage (currently) */
    if (dset->shared->dcpl_cache.efl.nused > 0)
        HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "external storage not supported with chunked layout")

    /* Sanity check dimensions */
    for (u = 0; u < dset->shared->layout.u.chunk.ndims - 1; u++) {
        /* Don't allow zero-sized chunk dimensions */
        if (0 == dset->shared->layout.u.chunk.dim[u])
            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "chunk size must be > 0, dim = %u ", u)

        /*
         * The chunk size of a dimension with a fixed size cannot exceed
         * the maximum dimension size. If any dimension size is zero, there
         * will be no such restriction.
         */
        if (dset->shared->curr_dims[u] && dset->shared->max_dims[u] != H5S_UNLIMITED &&
            dset->shared->max_dims[u] < dset->shared->layout.u.chunk.dim[u])
            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL,
                        "chunk size must be <= maximum dimension size for fixed-sized dimensions")
    } /* end for */

    /* Reset address and pointer of the array struct for the chunked storage index */
    if (H5D_chunk_idx_reset(&dset->shared->layout.storage.u.chunk, TRUE) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to reset chunked storage index")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_construct() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_init
 *
 * Purpose:    Initialize the raw data chunk cache for a dataset.  This is
 *        called when the dataset is initialized.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *              Monday, May 18, 1998
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_init(H5F_t *f, const H5D_t *const dset, hid_t dapl_id)
{
    H5D_chk_idx_info_t idx_info;                            /* Chunked index info */
    H5D_rdcc_t *       rdcc = &(dset->shared->cache.chunk); /* Convenience pointer to dataset's chunk cache */
    H5P_genplist_t *   dapl;                                /* Data access property list object pointer */
    H5O_storage_chunk_t *sc        = &(dset->shared->layout.storage.u.chunk);
    herr_t               ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    HDassert(f);
    HDassert(dset);
    H5D_CHUNK_STORAGE_INDEX_CHK(sc);

    if (NULL == (dapl = (H5P_genplist_t *)H5I_object(dapl_id)))
        HGOTO_ERROR(H5E_ID, H5E_BADID, FAIL, "can't find object for fapl ID")

    /* Use the properties in dapl_id if they have been set, otherwise use the properties from the file */
    if (H5P_get(dapl, H5D_ACS_DATA_CACHE_NUM_SLOTS_NAME, &rdcc->nslots) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get data cache number of slots")
    if (rdcc->nslots == H5D_CHUNK_CACHE_NSLOTS_DEFAULT)
        rdcc->nslots = H5F_RDCC_NSLOTS(f);

    if (H5P_get(dapl, H5D_ACS_DATA_CACHE_BYTE_SIZE_NAME, &rdcc->nbytes_max) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get data cache byte size")
    if (rdcc->nbytes_max == H5D_CHUNK_CACHE_NBYTES_DEFAULT)
        rdcc->nbytes_max = H5F_RDCC_NBYTES(f);

    if (H5P_get(dapl, H5D_ACS_PREEMPT_READ_CHUNKS_NAME, &rdcc->w0) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get preempt read chunks")
    if (rdcc->w0 < 0)
        rdcc->w0 = H5F_RDCC_W0(f);

    /* If nbytes_max or nslots is 0, set them both to 0 and avoid allocating space */
    if (!rdcc->nbytes_max || !rdcc->nslots)
        rdcc->nbytes_max = rdcc->nslots = 0;
    else {
        rdcc->slot = H5FL_SEQ_CALLOC(H5D_rdcc_ent_ptr_t, rdcc->nslots);
        if (NULL == rdcc->slot)
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")

        /* Reset any cached chunk info for this dataset */
        H5D__chunk_cinfo_cache_reset(&(rdcc->last));
    } /* end else */

    /* Compute scaled dimension info, if dataset dims > 1 */
    if (dset->shared->ndims > 1) {
        unsigned u; /* Local index value */

        for (u = 0; u < dset->shared->ndims; u++) {
            hsize_t scaled_power2up; /* Scaled value, rounded to next power of 2 */

            /* Initial scaled dimension sizes */
            if (dset->shared->layout.u.chunk.dim[u] == 0)
                HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "chunk size must be > 0, dim = %u ", u)

            /* Round up to the next integer # of chunks, to accommodate partial chunks */
            rdcc->scaled_dims[u] = (dset->shared->curr_dims[u] + dset->shared->layout.u.chunk.dim[u] - 1) /
                                   dset->shared->layout.u.chunk.dim[u];

            if (!(scaled_power2up = H5VM_power2up(rdcc->scaled_dims[u])))
                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "unable to get the next power of 2")

            /* Initial 'power2up' values for scaled dimensions */
            rdcc->scaled_power2up[u] = scaled_power2up;

            /* Number of bits required to encode scaled dimension size */
            rdcc->scaled_encode_bits[u] = H5VM_log2_gen(rdcc->scaled_power2up[u]);
        } /* end for */
    }     /* end if */

    /* Compose chunked index info struct */
    idx_info.f       = f;
    idx_info.pline   = &dset->shared->dcpl_cache.pline;
    idx_info.layout  = &dset->shared->layout.u.chunk;
    idx_info.storage = sc;

    /* Allocate any indexing structures */
    if (sc->ops->init && (sc->ops->init)(&idx_info, dset->shared->space, dset->oloc.addr) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't initialize indexing information")

    /* Set the number of chunks in dataset, etc. */
    if (H5D__chunk_set_info(dset) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to set # of chunks for dataset")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_init() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_is_space_alloc
 *
 * Purpose:    Query if space is allocated for layout
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *              Thursday, January 15, 2009
 *
 *-------------------------------------------------------------------------
 */
hbool_t
H5D__chunk_is_space_alloc(const H5O_storage_t *storage)
{
    const H5O_storage_chunk_t *sc        = &(storage->u.chunk);
    hbool_t                    ret_value = FALSE; /* Return value */

    FUNC_ENTER_PACKAGE_NOERR

    /* Sanity checks */
    HDassert(storage);
    H5D_CHUNK_STORAGE_INDEX_CHK(sc);

    /* Query index layer */
    ret_value = (sc->ops->is_space_alloc)(sc);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_is_space_alloc() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_is_data_cached
 *
 * Purpose:     Query if raw data is cached for dataset
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Neil Fortner
 *              Wednessday, March 6, 2016
 *
 *-------------------------------------------------------------------------
 */
hbool_t
H5D__chunk_is_data_cached(const H5D_shared_t *shared_dset)
{
    FUNC_ENTER_PACKAGE_NOERR

    /* Sanity checks */
    HDassert(shared_dset);

    FUNC_LEAVE_NOAPI(shared_dset->cache.chunk.nused > 0)
} /* end H5D__chunk_is_data_cached() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_io_init
 *
 * Purpose:    Performs initialization before any sort of I/O on the raw data
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *              Thursday, March 20, 2008
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_io_init(H5D_io_info_t *io_info, const H5D_type_info_t *type_info, hsize_t nelmts,
                   H5S_t *file_space, H5S_t *mem_space, H5D_chunk_map_t *fm)
{
    const H5D_t *dataset = io_info->dset;       /* Local pointer to dataset info */
    hssize_t     old_offset[H5O_LAYOUT_NDIMS];  /* Old selection offset */
    htri_t       file_space_normalized = FALSE; /* File dataspace was normalized */
    unsigned     f_ndims;                       /* The number of dimensions of the file's dataspace */
    int          sm_ndims; /* The number of dimensions of the memory buffer's dataspace (signed) */
    htri_t       use_selection_io = FALSE; /* Whether to use selection I/O */
    unsigned     u;                        /* Local index variable */
    herr_t       ret_value = SUCCEED;      /* Return value        */

    FUNC_ENTER_PACKAGE

    /* Get layout for dataset */
    fm->layout = &(dataset->shared->layout);
    fm->nelmts = nelmts;

    /* Check if the memory space is scalar & make equivalent memory space */
    if ((sm_ndims = H5S_GET_EXTENT_NDIMS(mem_space)) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "unable to get dimension number")
    /* Set the number of dimensions for the memory dataspace */
    H5_CHECKED_ASSIGN(fm->m_ndims, unsigned, sm_ndims, int);

    /* Get rank for file dataspace */
    fm->f_ndims = f_ndims = dataset->shared->layout.u.chunk.ndims - 1;

    /* Normalize hyperslab selections by adjusting them by the offset */
    /* (It might be worthwhile to normalize both the file and memory dataspaces
     * before any (contiguous, chunked, etc) file I/O operation, in order to
     * speed up hyperslab calculations by removing the extra checks and/or
     * additions involving the offset and the hyperslab selection -QAK)
     */
    if ((file_space_normalized = H5S_hyper_normalize_offset(file_space, old_offset)) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "unable to normalize selection")

    /* Decide the number of chunks in each dimension */
    for (u = 0; u < f_ndims; u++)
        /* Keep the size of the chunk dimensions as hsize_t for various routines */
        fm->chunk_dim[u] = fm->layout->u.chunk.dim[u];

#ifdef H5_HAVE_PARALLEL
    /* Calculate total chunk in file map*/
    fm->select_chunk = NULL;
    if (io_info->using_mpi_vfd) {
        H5_CHECK_OVERFLOW(fm->layout->u.chunk.nchunks, hsize_t, size_t);
        if (fm->layout->u.chunk.nchunks)
            if (NULL == (fm->select_chunk = (H5D_chunk_info_t **)H5MM_calloc(
                             (size_t)fm->layout->u.chunk.nchunks * sizeof(H5D_chunk_info_t *))))
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't allocate chunk info")
    }  /* end if */
#endif /* H5_HAVE_PARALLEL */

    /* Initialize "last chunk" information */
    fm->last_index      = (hsize_t)-1;
    fm->last_chunk_info = NULL;

    /* Point at the dataspaces */
    fm->file_space = file_space;
    fm->mem_space  = mem_space;

    if (H5D__chunk_io_init_selections(io_info, type_info, fm) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to create file and memory chunk selections")

    /* Check if we're performing selection I/O and save the result */
    if ((use_selection_io = H5D__chunk_may_use_select_io(io_info)) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't check if selection I/O is possible")
    io_info->use_select_io = (hbool_t)use_selection_io;

done:
    /* Reset the global dataspace info */
    fm->file_space = NULL;
    fm->mem_space  = NULL;

    if (file_space_normalized == TRUE)
        if (H5S_hyper_denormalize_offset(file_space, old_offset) < 0)
            HDONE_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "can't denormalize selection")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_io_init() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_io_init_selections
 *
 * Purpose:        Initialize the chunk mappings
 *
 * Return:        Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *              Thursday, March 20, 2008
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_io_init_selections(const H5D_io_info_t *io_info, const H5D_type_info_t *type_info,
                              H5D_chunk_map_t *fm)
{
    const H5D_t *dataset    = io_info->dset;       /* Local pointer to dataset info */
    const H5T_t *mem_type   = type_info->mem_type; /* Local pointer to memory datatype */
    H5S_t *      tmp_mspace = NULL;                /* Temporary memory dataspace */
    H5T_t *      file_type  = NULL;                /* Temporary copy of file datatype for iteration */
    hbool_t      iter_init  = FALSE;               /* Selection iteration info has been initialized */
    char         bogus;                            /* "bogus" buffer to pass to selection iterator */
    herr_t       ret_value = SUCCEED;              /* Return value        */

    FUNC_ENTER_PACKAGE

    /* Special case for only one element in selection */
    /* (usually appending a record) */
    if (fm->nelmts == 1
#ifdef H5_HAVE_PARALLEL
        && !(io_info->using_mpi_vfd)
#endif /* H5_HAVE_PARALLEL */
        && H5S_SEL_ALL != H5S_GET_SELECT_TYPE(fm->file_space)) {
        /* Initialize skip list for chunk selections */
        fm->sel_chunks = NULL;
        fm->use_single = TRUE;

        /* Initialize single chunk dataspace */
        if (NULL == dataset->shared->cache.chunk.single_space) {
            /* Make a copy of the dataspace for the dataset */
            if ((dataset->shared->cache.chunk.single_space = H5S_copy(fm->file_space, TRUE, FALSE)) == NULL)
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "unable to copy file space")

            /* Resize chunk's dataspace dimensions to size of chunk */
            if (H5S_set_extent_real(dataset->shared->cache.chunk.single_space, fm->chunk_dim) < 0)
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTSET, FAIL, "can't adjust chunk dimensions")

            /* Set the single chunk dataspace to 'all' selection */
            if (H5S_select_all(dataset->shared->cache.chunk.single_space, TRUE) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTSELECT, FAIL, "unable to set all selection")
        } /* end if */
        fm->single_space = dataset->shared->cache.chunk.single_space;
        HDassert(fm->single_space);

        /* Allocate the single chunk information */
        if (NULL == dataset->shared->cache.chunk.single_chunk_info)
            if (NULL == (dataset->shared->cache.chunk.single_chunk_info = H5FL_MALLOC(H5D_chunk_info_t)))
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't allocate chunk info")
        fm->single_chunk_info = dataset->shared->cache.chunk.single_chunk_info;
        HDassert(fm->single_chunk_info);

        /* Reset chunk template information */
        fm->mchunk_tmpl = NULL;

        /* Set up chunk mapping for single element */
        if (H5D__create_chunk_map_single(fm, io_info) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL,
                        "unable to create chunk selections for single element")
    } /* end if */
    else {
        hbool_t sel_hyper_flag; /* Whether file selection is a hyperslab */

        /* Initialize skip list for chunk selections */
        if (NULL == dataset->shared->cache.chunk.sel_chunks)
            if (NULL == (dataset->shared->cache.chunk.sel_chunks = H5SL_create(H5SL_TYPE_HSIZE, NULL)))
                HGOTO_ERROR(H5E_DATASET, H5E_CANTCREATE, FAIL, "can't create skip list for chunk selections")
        fm->sel_chunks = dataset->shared->cache.chunk.sel_chunks;
        HDassert(fm->sel_chunks);

        /* We are not using single element mode */
        fm->use_single = FALSE;

        /* Get type of selection on disk & in memory */
        if ((fm->fsel_type = H5S_GET_SELECT_TYPE(fm->file_space)) < H5S_SEL_NONE)
            HGOTO_ERROR(H5E_DATASET, H5E_BADSELECT, FAIL, "unable to get type of selection")
        if ((fm->msel_type = H5S_GET_SELECT_TYPE(fm->mem_space)) < H5S_SEL_NONE)
            HGOTO_ERROR(H5E_DATASET, H5E_BADSELECT, FAIL, "unable to get type of selection")

        /* If the selection is NONE or POINTS, set the flag to FALSE */
        if (fm->fsel_type == H5S_SEL_POINTS || fm->fsel_type == H5S_SEL_NONE)
            sel_hyper_flag = FALSE;
        else
            sel_hyper_flag = TRUE;

        /* Check if file selection is a not a hyperslab selection */
        if (sel_hyper_flag) {
            /* Build the file selection for each chunk */
            if (H5S_SEL_ALL == fm->fsel_type) {
                if (H5D__create_chunk_file_map_all(fm, io_info) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to create file chunk selections")
            } /* end if */
            else {
                /* Sanity check */
                HDassert(fm->fsel_type == H5S_SEL_HYPERSLABS);

                if (H5D__create_chunk_file_map_hyper(fm, io_info) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to create file chunk selections")
            } /* end else */
        }     /* end if */
        else {
            H5S_sel_iter_op_t        iter_op; /* Operator for iteration */
            H5D_chunk_file_iter_ud_t udata;   /* User data for iteration */

            /* Create temporary datatypes for selection iteration */
            if (NULL == (file_type = H5T_copy(dataset->shared->type, H5T_COPY_ALL)))
                HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCOPY, FAIL, "unable to copy file datatype")

            /* Initialize the user data */
            udata.fm = fm;
#ifdef H5_HAVE_PARALLEL
            udata.io_info = io_info;
#endif /* H5_HAVE_PARALLEL */

            iter_op.op_type  = H5S_SEL_ITER_OP_LIB;
            iter_op.u.lib_op = H5D__chunk_file_cb;

            /* Spaces might not be the same shape, iterate over the file selection directly */
            if (H5S_select_iterate(&bogus, file_type, fm->file_space, &iter_op, &udata) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to create file chunk selections")

            /* Reset "last chunk" info */
            fm->last_index      = (hsize_t)-1;
            fm->last_chunk_info = NULL;
        } /* end else */

        /* Build the memory selection for each chunk */
        if (sel_hyper_flag && H5S_SELECT_SHAPE_SAME(fm->file_space, fm->mem_space) == TRUE) {
            /* Reset chunk template information */
            fm->mchunk_tmpl = NULL;

            /* If the selections are the same shape, use the file chunk information
             * to generate the memory chunk information quickly.
             */
            if (H5D__create_chunk_mem_map_hyper(fm) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to create memory chunk selections")
        } /* end if */
        else if (sel_hyper_flag && fm->f_ndims == 1 && fm->m_ndims == 1 &&
                 H5S_SELECT_IS_REGULAR(fm->mem_space) && H5S_SELECT_IS_SINGLE(fm->mem_space)) {
            if (H5D__create_chunk_mem_map_1d(fm) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to create file chunk selections")
        } /* end else-if */
        else {
            H5S_sel_iter_op_t iter_op;   /* Operator for iteration */
            size_t            elmt_size; /* Memory datatype size */

            /* Make a copy of equivalent memory space */
            if ((tmp_mspace = H5S_copy(fm->mem_space, TRUE, FALSE)) == NULL)
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "unable to copy memory space")

            /* De-select the mem space copy */
            if (H5S_select_none(tmp_mspace) < 0)
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "unable to de-select memory space")

            /* Save chunk template information */
            fm->mchunk_tmpl = tmp_mspace;

            /* Create temporary datatypes for selection iteration */
            if (!file_type)
                if (NULL == (file_type = H5T_copy(dataset->shared->type, H5T_COPY_ALL)))
                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCOPY, FAIL, "unable to copy file datatype")

            /* Create selection iterator for memory selection */
            if (0 == (elmt_size = H5T_get_size(mem_type)))
                HGOTO_ERROR(H5E_DATATYPE, H5E_BADSIZE, FAIL, "datatype size invalid")
            if (H5S_select_iter_init(&(fm->mem_iter), fm->mem_space, elmt_size, 0) < 0)
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "unable to initialize selection iterator")
            iter_init = TRUE; /* Selection iteration info has been initialized */

            iter_op.op_type  = H5S_SEL_ITER_OP_LIB;
            iter_op.u.lib_op = H5D__chunk_mem_cb;

            /* Spaces aren't the same shape, iterate over the memory selection directly */
            if (H5S_select_iterate(&bogus, file_type, fm->file_space, &iter_op, fm) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to create memory chunk selections")
        } /* end else */
    }     /* end else */

done:
    /* Release the [potentially partially built] chunk mapping information if an error occurs */
    if (ret_value < 0) {
        if (tmp_mspace && !fm->mchunk_tmpl)
            if (H5S_close(tmp_mspace) < 0)
                HDONE_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL,
                            "can't release memory chunk dataspace template")
        if (H5D__chunk_io_term(fm) < 0)
            HDONE_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "unable to release chunk mapping")
    } /* end if */

    if (iter_init && H5S_SELECT_ITER_RELEASE(&(fm->mem_iter)) < 0)
        HDONE_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "unable to release selection iterator")
    if (file_type && (H5T_close_real(file_type) < 0))
        HDONE_ERROR(H5E_DATATYPE, H5E_CANTFREE, FAIL, "Can't free temporary datatype")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_io_init_selections() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_mem_alloc
 *
 * Purpose:    Allocate space for a chunk in memory.  This routine allocates
 *              memory space for non-filtered chunks from a block free list
 *              and uses malloc()/free() for filtered chunks.
 *
 * Return:    Pointer to memory for chunk on success/NULL on failure
 *
 * Programmer:    Quincey Koziol
 *              April 22, 2004
 *
 *-------------------------------------------------------------------------
 */
void *
H5D__chunk_mem_alloc(size_t size, void *pline)
{
    H5O_pline_t *_pline    = (H5O_pline_t *)pline;
    void *       ret_value = NULL; /* Return value */

    FUNC_ENTER_PACKAGE_NOERR

    HDassert(size);

    if (_pline && _pline->nused)
        ret_value = H5MM_malloc(size);
    else
        ret_value = H5FL_BLK_MALLOC(chunk, size);

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D__chunk_mem_alloc() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_mem_xfree
 *
 * Purpose:    Free space for a chunk in memory.  This routine releases
 *              memory space for non-filtered chunks from a block free list
 *              and uses malloc()/free() for filtered chunks.
 *
 * Return:    NULL (never fails)
 *
 * Programmer:    Quincey Koziol
 *              April 22, 2004
 *
 *-------------------------------------------------------------------------
 */
void *
H5D__chunk_mem_xfree(void *chk, const void *pline)
{
    const H5O_pline_t *_pline = (const H5O_pline_t *)pline;

    FUNC_ENTER_PACKAGE_NOERR

    if (chk) {
        if (_pline && _pline->nused)
            H5MM_xfree(chk);
        else
            chk = H5FL_BLK_FREE(chunk, chk);
    } /* end if */

    FUNC_LEAVE_NOAPI(NULL)
} /* H5D__chunk_mem_xfree() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_mem_free
 *
 * Purpose:    Wrapper with H5MM_free_t-compatible signature that just
 *             calls H5D__chunk_mem_xfree and discards the return value.
 *-------------------------------------------------------------------------
 */
void
H5D__chunk_mem_free(void *chk, void *pline)
{
    (void)H5D__chunk_mem_xfree(chk, pline);
}

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_mem_realloc
 *
 * Purpose:     Reallocate space for a chunk in memory.  This routine allocates
 *              memory space for non-filtered chunks from a block free list
 *              and uses malloc()/free() for filtered chunks.
 *
 * Return:      Pointer to memory for chunk on success/NULL on failure
 *
 * Programmer:  Neil Fortner
 *              May 3, 2010
 *
 *-------------------------------------------------------------------------
 */
void *
H5D__chunk_mem_realloc(void *chk, size_t size, const H5O_pline_t *pline)
{
    void *ret_value = NULL; /* Return value */

    FUNC_ENTER_PACKAGE_NOERR

    HDassert(size);
    HDassert(pline);

    if (pline->nused > 0)
        ret_value = H5MM_realloc(chk, size);
    else
        ret_value = H5FL_BLK_REALLOC(chunk, chk, size);

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D__chunk_mem_realloc() */

/*--------------------------------------------------------------------------
 NAME
    H5D__free_chunk_info
 PURPOSE
    Internal routine to destroy a chunk info node
 USAGE
    void H5D__free_chunk_info(chunk_info)
        void *chunk_info;    IN: Pointer to chunk info to destroy
 RETURNS
    No return value
 DESCRIPTION
    Releases all the memory for a chunk info node.  Called by H5SL_free
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
static herr_t
H5D__free_chunk_info(void *item, void H5_ATTR_UNUSED *key, void H5_ATTR_UNUSED *opdata)
{
    H5D_chunk_info_t *chunk_info = (H5D_chunk_info_t *)item;

    FUNC_ENTER_PACKAGE_NOERR

    HDassert(chunk_info);

    /* Close the chunk's file dataspace, if it's not shared */
    if (!chunk_info->fspace_shared)
        (void)H5S_close(chunk_info->fspace);
    else
        H5S_select_all(chunk_info->fspace, TRUE);

    /* Close the chunk's memory dataspace, if it's not shared */
    if (!chunk_info->mspace_shared && chunk_info->mspace)
        (void)H5S_close(chunk_info->mspace);

    /* Free the actual chunk info */
    chunk_info = H5FL_FREE(H5D_chunk_info_t, chunk_info);

    FUNC_LEAVE_NOAPI(0)
} /* H5D__free_chunk_info() */

/*-------------------------------------------------------------------------
 * Function:    H5D__create_chunk_map_single
 *
 * Purpose:    Create chunk selections when appending a single record
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *        Tuesday, November 20, 2007
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__create_chunk_map_single(H5D_chunk_map_t *fm, const H5D_io_info_t
#ifndef H5_HAVE_PARALLEL
                                                      H5_ATTR_UNUSED
#endif /* H5_HAVE_PARALLEL */
                                                          *io_info)
{
    H5D_chunk_info_t *chunk_info;                  /* Chunk information to insert into skip list */
    hsize_t           coords[H5O_LAYOUT_NDIMS];    /* Coordinates of chunk */
    hsize_t           sel_start[H5O_LAYOUT_NDIMS]; /* Offset of low bound of file selection */
    hsize_t           sel_end[H5O_LAYOUT_NDIMS];   /* Offset of high bound of file selection */
    unsigned          u;                           /* Local index variable */
    herr_t            ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    HDassert(fm->f_ndims > 0);

    /* Get coordinate for selection */
    if (H5S_SELECT_BOUNDS(fm->file_space, sel_start, sel_end) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "can't get file selection bound info")

    /* Initialize the 'single chunk' file & memory chunk information */
    chunk_info               = fm->single_chunk_info;
    chunk_info->chunk_points = 1;

    /* Set chunk location & hyperslab size */
    for (u = 0; u < fm->f_ndims; u++) {
        /* Validate this chunk dimension */
        if (fm->layout->u.chunk.dim[u] == 0)
            HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "chunk size must be > 0, dim = %u ", u)
        HDassert(sel_start[u] == sel_end[u]);
        chunk_info->scaled[u] = sel_start[u] / fm->layout->u.chunk.dim[u];
        coords[u]             = chunk_info->scaled[u] * fm->layout->u.chunk.dim[u];
    } /* end for */
    chunk_info->scaled[fm->f_ndims] = 0;

    /* Calculate the index of this chunk */
    chunk_info->index =
        H5VM_array_offset_pre(fm->f_ndims, fm->layout->u.chunk.down_chunks, chunk_info->scaled);

    /* Copy selection for file's dataspace into chunk dataspace */
    if (H5S_select_copy(fm->single_space, fm->file_space, FALSE) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "unable to copy file selection")

    /* Move selection back to have correct offset in chunk */
    if (H5S_SELECT_ADJUST_U(fm->single_space, coords) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTSELECT, FAIL, "can't adjust chunk selection")

#ifdef H5_HAVE_PARALLEL
    /* store chunk selection information */
    if (io_info->using_mpi_vfd)
        fm->select_chunk[chunk_info->index] = chunk_info;
#endif /* H5_HAVE_PARALLEL */

    /* Set the file dataspace for the chunk to the shared 'single' dataspace */
    chunk_info->fspace = fm->single_space;

    /* Indicate that the chunk's file dataspace is shared */
    chunk_info->fspace_shared = TRUE;

    /* Just point at the memory dataspace & selection */
    chunk_info->mspace = fm->mem_space;

    /* Indicate that the chunk's memory dataspace is shared */
    chunk_info->mspace_shared = TRUE;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__create_chunk_map_single() */

/*-------------------------------------------------------------------------
 * Function:    H5D__create_chunk_file_map_all
 *
 * Purpose:    Create all chunk selections in file, for an "all" selection.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *        Monday, January 21, 2019
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__create_chunk_file_map_all(H5D_chunk_map_t *fm, const H5D_io_info_t
#ifndef H5_HAVE_PARALLEL
                                                        H5_ATTR_UNUSED
#endif /* H5_HAVE_PARALLEL */
                                                            *io_info)
{
    H5S_t * tmp_fchunk = NULL;       /* Temporary file dataspace */
    hsize_t file_dims[H5S_MAX_RANK]; /* File dataspace dims */
    hsize_t sel_points;              /* Number of elements in file selection */
    hsize_t zeros[H5S_MAX_RANK];     /* All zero vector (for start parameter to setting hyperslab on partial
                                        chunks) */
    hsize_t  coords[H5S_MAX_RANK];   /* Current coordinates of chunk */
    hsize_t  end[H5S_MAX_RANK];      /* Final coordinates of chunk */
    hsize_t  scaled[H5S_MAX_RANK];   /* Scaled coordinates for this chunk */
    hsize_t  chunk_index;            /* "Index" of chunk */
    hsize_t  curr_partial_clip[H5S_MAX_RANK]; /* Current partial dimension sizes to clip against */
    hsize_t  partial_dim_size[H5S_MAX_RANK];  /* Size of a partial dimension */
    hbool_t  is_partial_dim[H5S_MAX_RANK];    /* Whether a dimension is currently a partial chunk */
    unsigned num_partial_dims;                /* Current number of partial dimensions */
    unsigned u;                               /* Local index variable */
    herr_t   ret_value = SUCCEED;             /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    HDassert(fm->f_ndims > 0);

    /* Get number of elements selected in file */
    sel_points = fm->nelmts;

    /* Get dataspace dimensions */
    if (H5S_get_simple_extent_dims(fm->file_space, file_dims, NULL) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "can't get file selection bound info")

    /* Set initial chunk location, partial dimensions, etc */
    num_partial_dims = 0;
    HDmemset(zeros, 0, sizeof(zeros));
    for (u = 0; u < fm->f_ndims; u++) {
        /* Validate this chunk dimension */
        if (fm->layout->u.chunk.dim[u] == 0)
            HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "chunk size must be > 0, dim = %u ", u)

        /* Set up start / end coordinates for first chunk */
        scaled[u] = 0;
        coords[u] = 0;
        end[u]    = fm->chunk_dim[u] - 1;

        /* Iniitialize partial chunk dimension information */
        partial_dim_size[u] = file_dims[u] % fm->chunk_dim[u];
        if (file_dims[u] < fm->chunk_dim[u]) {
            curr_partial_clip[u] = partial_dim_size[u];
            is_partial_dim[u]    = TRUE;
            num_partial_dims++;
        } /* end if */
        else {
            curr_partial_clip[u] = fm->chunk_dim[u];
            is_partial_dim[u]    = FALSE;
        } /* end else */
    }     /* end for */

    /* Set the index of this chunk */
    chunk_index = 0;

    /* Create "temporary" chunk for selection operations (copy file space) */
    if (NULL == (tmp_fchunk = H5S_create_simple(fm->f_ndims, fm->chunk_dim, NULL)))
        HGOTO_ERROR(H5E_DATASET, H5E_CANTCREATE, FAIL, "unable to create dataspace for chunk")

    /* Iterate through each chunk in the dataset */
    while (sel_points) {
        H5D_chunk_info_t *new_chunk_info; /* chunk information to insert into skip list */
        hsize_t           chunk_points;   /* Number of elements in chunk selection */

        /* Add temporary chunk to the list of chunks */

        /* Allocate the file & memory chunk information */
        if (NULL == (new_chunk_info = H5FL_MALLOC(H5D_chunk_info_t)))
            HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "can't allocate chunk info")

        /* Initialize the chunk information */

        /* Set the chunk index */
        new_chunk_info->index = chunk_index;

#ifdef H5_HAVE_PARALLEL
        /* Store chunk selection information, for multi-chunk I/O */
        if (io_info->using_mpi_vfd)
            fm->select_chunk[chunk_index] = new_chunk_info;
#endif /* H5_HAVE_PARALLEL */

        /* Set the file chunk dataspace */
        if (NULL == (new_chunk_info->fspace = H5S_copy(tmp_fchunk, TRUE, FALSE)))
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "unable to copy chunk dataspace")
        new_chunk_info->fspace_shared = FALSE;

        /* If there are partial dimensions for this chunk, set the hyperslab for them */
        if (num_partial_dims > 0)
            if (H5S_select_hyperslab(new_chunk_info->fspace, H5S_SELECT_SET, zeros, NULL, curr_partial_clip,
                                     NULL) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTSELECT, FAIL, "can't create chunk selection")

        /* Set the memory chunk dataspace */
        new_chunk_info->mspace        = NULL;
        new_chunk_info->mspace_shared = FALSE;

        /* Copy the chunk's scaled coordinates */
        H5MM_memcpy(new_chunk_info->scaled, scaled, sizeof(hsize_t) * fm->f_ndims);
        new_chunk_info->scaled[fm->f_ndims] = 0;

        /* Insert the new chunk into the skip list */
        if (H5SL_insert(fm->sel_chunks, new_chunk_info, &new_chunk_info->index) < 0) {
            H5D__free_chunk_info(new_chunk_info, NULL, NULL);
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINSERT, FAIL, "can't insert chunk into skip list")
        } /* end if */

        /* Get number of elements selected in chunk */
        chunk_points = H5S_GET_SELECT_NPOINTS(new_chunk_info->fspace);
        H5_CHECKED_ASSIGN(new_chunk_info->chunk_points, uint32_t, chunk_points, hsize_t);

        /* Decrement # of points left in file selection */
        sel_points -= chunk_points;

        /* Advance to next chunk if we are not done */
        if (sel_points > 0) {
            int curr_dim; /* Current dimension to increment */

            /* Increment chunk index */
            chunk_index++;

            /* Set current increment dimension */
            curr_dim = (int)fm->f_ndims - 1;

            /* Increment chunk location in fastest changing dimension */
            coords[curr_dim] += fm->chunk_dim[curr_dim];
            scaled[curr_dim]++;
            end[curr_dim] += fm->chunk_dim[curr_dim];

            /* Bring chunk location back into bounds, if necessary */
            if (coords[curr_dim] >= file_dims[curr_dim]) {
                do {
                    /* Reset current dimension's location to 0 */
                    coords[curr_dim] = 0;
                    scaled[curr_dim] = 0;
                    end[curr_dim]    = fm->chunk_dim[curr_dim] - 1;

                    /* Check for previous partial chunk in this dimension */
                    if (is_partial_dim[curr_dim] && end[curr_dim] < file_dims[curr_dim]) {
                        /* Sanity check */
                        HDassert(num_partial_dims > 0);

                        /* Reset partial chunk information for this dimension */
                        curr_partial_clip[curr_dim] = fm->chunk_dim[curr_dim];
                        is_partial_dim[curr_dim]    = FALSE;
                        num_partial_dims--;
                    } /* end if */

                    /* Decrement current dimension */
                    curr_dim--;

                    /* Check for valid current dim */
                    if (curr_dim >= 0) {
                        /* Increment chunk location in current dimension */
                        coords[curr_dim] += fm->chunk_dim[curr_dim];
                        scaled[curr_dim]++;
                        end[curr_dim] = (coords[curr_dim] + fm->chunk_dim[curr_dim]) - 1;
                    } /* end if */
                } while (curr_dim >= 0 && (coords[curr_dim] >= file_dims[curr_dim]));
            } /* end if */

            /* Check for valid current dim */
            if (curr_dim >= 0) {
                /* Check for partial chunk in this dimension */
                if (!is_partial_dim[curr_dim] && file_dims[curr_dim] <= end[curr_dim]) {
                    /* Set partial chunk information for this dimension */
                    curr_partial_clip[curr_dim] = partial_dim_size[curr_dim];
                    is_partial_dim[curr_dim]    = TRUE;
                    num_partial_dims++;

                    /* Sanity check */
                    HDassert(num_partial_dims <= fm->f_ndims);
                } /* end if */
            }     /* end if */
        }         /* end if */
    }             /* end while */

done:
    /* Clean up */
    if (tmp_fchunk && H5S_close(tmp_fchunk) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CANTRELEASE, FAIL, "can't release temporary dataspace")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__create_chunk_file_map_all() */

/*-------------------------------------------------------------------------
 * Function:    H5D__create_chunk_file_map_hyper
 *
 * Purpose:    Create all chunk selections in file, for a hyperslab selection.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *        Thursday, May 29, 2003
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__create_chunk_file_map_hyper(H5D_chunk_map_t *fm, const H5D_io_info_t
#ifndef H5_HAVE_PARALLEL
                                                          H5_ATTR_UNUSED
#endif /* H5_HAVE_PARALLEL */
                                                              *io_info)
{
    H5S_t *  tmp_fchunk = NULL;              /* Temporary file dataspace */
    hsize_t  sel_start[H5O_LAYOUT_NDIMS];    /* Offset of low bound of file selection */
    hsize_t  sel_end[H5O_LAYOUT_NDIMS];      /* Offset of high bound of file selection */
    hsize_t  sel_points;                     /* Number of elements in file selection */
    hsize_t  start_coords[H5O_LAYOUT_NDIMS]; /* Starting coordinates of selection */
    hsize_t  coords[H5O_LAYOUT_NDIMS];       /* Current coordinates of chunk */
    hsize_t  end[H5O_LAYOUT_NDIMS];          /* Final coordinates of chunk */
    hsize_t  chunk_index;                    /* Index of chunk */
    hsize_t  start_scaled[H5S_MAX_RANK];     /* Starting scaled coordinates of selection */
    hsize_t  scaled[H5S_MAX_RANK];           /* Scaled coordinates for this chunk */
    int      curr_dim;                       /* Current dimension to increment */
    unsigned u;                              /* Local index variable */
    herr_t   ret_value = SUCCEED;            /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    HDassert(fm->f_ndims > 0);

    /* Get number of elements selected in file */
    sel_points = fm->nelmts;

    /* Get bounding box for selection (to reduce the number of chunks to iterate over) */
    if (H5S_SELECT_BOUNDS(fm->file_space, sel_start, sel_end) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "can't get file selection bound info")

    /* Set initial chunk location & hyperslab size */
    for (u = 0; u < fm->f_ndims; u++) {
        /* Validate this chunk dimension */
        if (fm->layout->u.chunk.dim[u] == 0)
            HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "chunk size must be > 0, dim = %u ", u)
        scaled[u] = start_scaled[u] = sel_start[u] / fm->layout->u.chunk.dim[u];
        coords[u] = start_coords[u] = scaled[u] * fm->layout->u.chunk.dim[u];
        end[u]                      = (coords[u] + fm->chunk_dim[u]) - 1;
    } /* end for */

    /* Calculate the index of this chunk */
    chunk_index = H5VM_array_offset_pre(fm->f_ndims, fm->layout->u.chunk.down_chunks, scaled);

    /* Iterate through each chunk in the dataset */
    while (sel_points) {
        /* Check for intersection of current chunk and file selection */
        if (TRUE == H5S_SELECT_INTERSECT_BLOCK(fm->file_space, coords, end)) {
            H5D_chunk_info_t *new_chunk_info; /* chunk information to insert into skip list */
            hsize_t           chunk_points;   /* Number of elements in chunk selection */

            /* Create dataspace for chunk, 'AND'ing the overall selection with
             *  the current chunk.
             */
            if (H5S_combine_hyperslab(fm->file_space, H5S_SELECT_AND, coords, NULL, fm->chunk_dim, NULL,
                                      &tmp_fchunk) < 0)
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL,
                            "unable to combine file space selection with chunk block")

            /* Resize chunk's dataspace dimensions to size of chunk */
            if (H5S_set_extent_real(tmp_fchunk, fm->chunk_dim) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTSELECT, FAIL, "can't adjust chunk dimensions")

            /* Move selection back to have correct offset in chunk */
            if (H5S_SELECT_ADJUST_U(tmp_fchunk, coords) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTSELECT, FAIL, "can't adjust chunk selection")

            /* Add temporary chunk to the list of chunks */

            /* Allocate the file & memory chunk information */
            if (NULL == (new_chunk_info = H5FL_MALLOC(H5D_chunk_info_t)))
                HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "can't allocate chunk info")

            /* Initialize the chunk information */

            /* Set the chunk index */
            new_chunk_info->index = chunk_index;

#ifdef H5_HAVE_PARALLEL
            /* Store chunk selection information, for multi-chunk I/O */
            if (io_info->using_mpi_vfd)
                fm->select_chunk[chunk_index] = new_chunk_info;
#endif /* H5_HAVE_PARALLEL */

            /* Set the file chunk dataspace */
            new_chunk_info->fspace        = tmp_fchunk;
            new_chunk_info->fspace_shared = FALSE;
            tmp_fchunk                    = NULL;

            /* Set the memory chunk dataspace */
            new_chunk_info->mspace        = NULL;
            new_chunk_info->mspace_shared = FALSE;

            /* Copy the chunk's scaled coordinates */
            H5MM_memcpy(new_chunk_info->scaled, scaled, sizeof(hsize_t) * fm->f_ndims);
            new_chunk_info->scaled[fm->f_ndims] = 0;

            /* Insert the new chunk into the skip list */
            if (H5SL_insert(fm->sel_chunks, new_chunk_info, &new_chunk_info->index) < 0) {
                H5D__free_chunk_info(new_chunk_info, NULL, NULL);
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINSERT, FAIL, "can't insert chunk into skip list")
            } /* end if */

            /* Get number of elements selected in chunk */
            chunk_points = H5S_GET_SELECT_NPOINTS(new_chunk_info->fspace);
            H5_CHECKED_ASSIGN(new_chunk_info->chunk_points, uint32_t, chunk_points, hsize_t);

            /* Decrement # of points left in file selection */
            sel_points -= chunk_points;

            /* Leave if we are done */
            if (sel_points == 0)
                HGOTO_DONE(SUCCEED)
        } /* end if */

        /* Increment chunk index */
        chunk_index++;

        /* Set current increment dimension */
        curr_dim = (int)fm->f_ndims - 1;

        /* Increment chunk location in fastest changing dimension */
        coords[curr_dim] += fm->chunk_dim[curr_dim];
        end[curr_dim] += fm->chunk_dim[curr_dim];
        scaled[curr_dim]++;

        /* Bring chunk location back into bounds, if necessary */
        if (coords[curr_dim] > sel_end[curr_dim]) {
            do {
                /* Reset current dimension's location to 0 */
                scaled[curr_dim] = start_scaled[curr_dim];
                coords[curr_dim] =
                    start_coords[curr_dim]; /*lint !e771 The start_coords will always be initialized */
                end[curr_dim] = (coords[curr_dim] + fm->chunk_dim[curr_dim]) - 1;

                /* Decrement current dimension */
                curr_dim--;

                /* Check for valid current dim */
                if (curr_dim >= 0) {
                    /* Increment chunk location in current dimension */
                    scaled[curr_dim]++;
                    coords[curr_dim] += fm->chunk_dim[curr_dim];
                    end[curr_dim] = (coords[curr_dim] + fm->chunk_dim[curr_dim]) - 1;
                } /* end if */
            } while (curr_dim >= 0 && (coords[curr_dim] > sel_end[curr_dim]));

            /* Re-calculate the index of this chunk */
            chunk_index = H5VM_array_offset_pre(fm->f_ndims, fm->layout->u.chunk.down_chunks, scaled);
        } /* end if */
    }     /* end while */

done:
    /* Clean up on failure */
    if (ret_value < 0)
        if (tmp_fchunk && H5S_close(tmp_fchunk) < 0)
            HDONE_ERROR(H5E_DATASET, H5E_CANTRELEASE, FAIL, "can't release temporary dataspace")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__create_chunk_file_map_hyper() */

/*-------------------------------------------------------------------------
 * Function:    H5D__create_chunk_mem_map_hyper
 *
 * Purpose:    Create all chunk selections in memory by copying the file
 *              chunk selections and adjusting their offsets to be correct
 *              for the memory.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *        Thursday, May 29, 2003
 *
 * Assumptions: That the file and memory selections are the same shape.
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__create_chunk_mem_map_hyper(const H5D_chunk_map_t *fm)
{
    H5D_chunk_info_t *chunk_info;                   /* Pointer to chunk information */
    H5SL_node_t *     curr_node;                    /* Current node in skip list */
    hsize_t           file_sel_start[H5S_MAX_RANK]; /* Offset of low bound of file selection */
    hsize_t           file_sel_end[H5S_MAX_RANK];   /* Offset of high bound of file selection */
    hsize_t           mem_sel_start[H5S_MAX_RANK];  /* Offset of low bound of file selection */
    hsize_t           mem_sel_end[H5S_MAX_RANK];    /* Offset of high bound of file selection */
    hssize_t          adjust[H5S_MAX_RANK];         /* Adjustment to make to all file chunks */
    unsigned          u;                            /* Local index variable */
    herr_t            ret_value = SUCCEED;          /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    HDassert(fm->f_ndims > 0);

    /* Check for all I/O going to a single chunk */
    if (H5SL_count(fm->sel_chunks) == 1) {
        /* Get the node */
        curr_node = H5SL_first(fm->sel_chunks);

        /* Get pointer to chunk's information */
        chunk_info = (H5D_chunk_info_t *)H5SL_item(curr_node);
        HDassert(chunk_info);

        /* Just point at the memory dataspace & selection */
        chunk_info->mspace = fm->mem_space;

        /* Indicate that the chunk's memory space is shared */
        chunk_info->mspace_shared = TRUE;
    } /* end if */
    else {
        /* Get bounding box for file selection */
        if (H5S_SELECT_BOUNDS(fm->file_space, file_sel_start, file_sel_end) < 0)
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "can't get file selection bound info")

        /* Get bounding box for memory selection */
        if (H5S_SELECT_BOUNDS(fm->mem_space, mem_sel_start, mem_sel_end) < 0)
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "can't get file selection bound info")

        /* Calculate the adjustment for memory selection from file selection */
        HDassert(fm->m_ndims == fm->f_ndims);
        for (u = 0; u < fm->f_ndims; u++) {
            H5_CHECK_OVERFLOW(file_sel_start[u], hsize_t, hssize_t);
            H5_CHECK_OVERFLOW(mem_sel_start[u], hsize_t, hssize_t);
            adjust[u] = (hssize_t)file_sel_start[u] - (hssize_t)mem_sel_start[u];
        } /* end for */

        /* Iterate over each chunk in the chunk list */
        curr_node = H5SL_first(fm->sel_chunks);
        while (curr_node) {
            hsize_t      coords[H5S_MAX_RANK];       /* Current coordinates of chunk */
            hssize_t     chunk_adjust[H5S_MAX_RANK]; /* Adjustment to make to a particular chunk */
            H5S_sel_type chunk_sel_type;             /* Chunk's selection type */

            /* Get pointer to chunk's information */
            chunk_info = (H5D_chunk_info_t *)H5SL_item(curr_node);
            HDassert(chunk_info);

            /* Compute the chunk coordinates from the scaled coordinates */
            for (u = 0; u < fm->f_ndims; u++)
                coords[u] = chunk_info->scaled[u] * fm->layout->u.chunk.dim[u];

            /* Copy the information */

            /* Copy the memory dataspace */
            if ((chunk_info->mspace = H5S_copy(fm->mem_space, TRUE, FALSE)) == NULL)
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "unable to copy memory space")

            /* Get the chunk's selection type */
            if ((chunk_sel_type = H5S_GET_SELECT_TYPE(chunk_info->fspace)) < H5S_SEL_NONE)
                HGOTO_ERROR(H5E_DATASET, H5E_BADSELECT, FAIL, "unable to get type of selection")

            /* Set memory selection for "all" chunk selections */
            if (H5S_SEL_ALL == chunk_sel_type) {
                /* Adjust the chunk coordinates */
                for (u = 0; u < fm->f_ndims; u++)
                    coords[u] = (hsize_t)((hssize_t)coords[u] - adjust[u]);

                /* Set to same shape as chunk */
                if (H5S_select_hyperslab(chunk_info->mspace, H5S_SELECT_SET, coords, NULL, fm->chunk_dim,
                                         NULL) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTSELECT, FAIL, "can't create chunk memory selection")
            } /* end if */
            else {
                /* Sanity check */
                HDassert(H5S_SEL_HYPERSLABS == chunk_sel_type);

                /* Copy the file chunk's selection */
                if (H5S_SELECT_COPY(chunk_info->mspace, chunk_info->fspace, FALSE) < 0)
                    HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "unable to copy selection")

                /* Compute the adjustment for this chunk */
                for (u = 0; u < fm->f_ndims; u++) {
                    /* Compensate for the chunk offset */
                    H5_CHECK_OVERFLOW(coords[u], hsize_t, hssize_t);
                    chunk_adjust[u] = adjust[u] - (hssize_t)coords[u];
                } /* end for */

                /* Adjust the selection */
                if (H5S_SELECT_ADJUST_S(chunk_info->mspace, chunk_adjust) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "unable to adjust selection")
            } /* end else */

            /* Get the next chunk node in the skip list */
            curr_node = H5SL_next(curr_node);
        } /* end while */
    }     /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__create_chunk_mem_map_hyper() */

/*-------------------------------------------------------------------------
 * Function:    H5D__create_mem_map_1d
 *
 * Purpose:    Create all chunk selections for 1-dimensional regular memory space
 *          that has only one single block in the selection
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Vailin Choi
 *                Sept 18, 2019
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__create_chunk_mem_map_1d(const H5D_chunk_map_t *fm)
{
    H5D_chunk_info_t *chunk_info;          /* Pointer to chunk information */
    H5SL_node_t *     curr_node;           /* Current node in skip list */
    herr_t            ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    HDassert(fm->f_ndims > 0);

    /* Check for all I/O going to a single chunk */
    if (H5SL_count(fm->sel_chunks) == 1) {
        /* Get the node */
        curr_node = H5SL_first(fm->sel_chunks);

        /* Get pointer to chunk's information */
        chunk_info = (H5D_chunk_info_t *)H5SL_item(curr_node);
        HDassert(chunk_info);

        /* Just point at the memory dataspace & selection */
        chunk_info->mspace = fm->mem_space;

        /* Indicate that the chunk's memory space is shared */
        chunk_info->mspace_shared = TRUE;
    } /* end if */
    else {
        hsize_t mem_sel_start[H5S_MAX_RANK]; /* Offset of low bound of file selection */
        hsize_t mem_sel_end[H5S_MAX_RANK];   /* Offset of high bound of file selection */

        HDassert(fm->m_ndims == 1);

        if (H5S_SELECT_BOUNDS(fm->mem_space, mem_sel_start, mem_sel_end) < 0)
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, FAIL, "can't get file selection bound info")

        /* Iterate over each chunk in the chunk list */
        curr_node = H5SL_first(fm->sel_chunks);
        while (curr_node) {
            hsize_t chunk_points; /* Number of elements in chunk selection */
            hsize_t tmp_count = 1;

            /* Get pointer to chunk's information */
            chunk_info = (H5D_chunk_info_t *)H5SL_item(curr_node);
            HDassert(chunk_info);

            /* Copy the memory dataspace */
            if ((chunk_info->mspace = H5S_copy(fm->mem_space, TRUE, FALSE)) == NULL)
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, FAIL, "unable to copy memory space")

            chunk_points = H5S_GET_SELECT_NPOINTS(chunk_info->fspace);

            if (H5S_select_hyperslab(chunk_info->mspace, H5S_SELECT_SET, mem_sel_start, NULL, &tmp_count,
                                     &chunk_points) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTSELECT, FAIL, "can't create chunk memory selection")

            mem_sel_start[0] += chunk_points;

            /* Get the next chunk node in the skip list */
            curr_node = H5SL_next(curr_node);
        } /* end while */
    }     /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__create_chunk_mem_map_1d() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_file_cb
 *
 * Purpose:    Callback routine for file selection iterator.  Used when
 *              creating selections in file for each point selected.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *        Wednesday, July 23, 2003
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_file_cb(void H5_ATTR_UNUSED *elem, const H5T_t H5_ATTR_UNUSED *type, unsigned ndims,
                   const hsize_t *coords, void *_udata)
{
    H5D_chunk_file_iter_ud_t *udata = (H5D_chunk_file_iter_ud_t *)_udata; /* User data for operation */
    H5D_chunk_map_t *         fm    = udata->fm;                 /* File<->memory chunk mapping info */
    H5D_chunk_info_t *        chunk_info;                        /* Chunk information for current chunk */
    hsize_t                   coords_in_chunk[H5O_LAYOUT_NDIMS]; /* Coordinates of element in chunk */
    hsize_t                   chunk_index;                       /* Chunk index */
    hsize_t                   scaled[H5S_MAX_RANK];              /* Scaled coordinates for this chunk */
    unsigned                  u;                                 /* Local index variable */
    herr_t                    ret_value = SUCCEED;               /* Return value        */

    FUNC_ENTER_PACKAGE

    /* Calculate the index of this chunk */
    chunk_index = H5VM_chunk_index_scaled(ndims, coords, fm->layout->u.chunk.dim,
                                          fm->layout->u.chunk.down_chunks, scaled);

    /* Find correct chunk in file & memory skip list */
    if (chunk_index == fm->last_index) {
        /* If the chunk index is the same as the last chunk index we used,
         * get the cached info to operate on.
         */
        chunk_info = fm->last_chunk_info;
    } /* end if */
    else {
        /* If the chunk index is not the same as the last chunk index we used,
         * find the chunk in the skip list.
         */
        /* Get the chunk node from the skip list */
        if (NULL == (chunk_info = (H5D_chunk_info_t *)H5SL_search(fm->sel_chunks, &chunk_index))) {
            H5S_t *fspace; /* Memory chunk's dataspace */

            /* Allocate the file & memory chunk information */
            if (NULL == (chunk_info = H5FL_MALLOC(H5D_chunk_info_t)))
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't allocate chunk info")

            /* Initialize the chunk information */

            /* Set the chunk index */
            chunk_info->index = chunk_index;

            /* Create a dataspace for the chunk */
            if ((fspace = H5S_create_simple(fm->f_ndims, fm->chunk_dim, NULL)) == NULL) {
                chunk_info = H5FL_FREE(H5D_chunk_info_t, chunk_info);
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCREATE, FAIL, "unable to create dataspace for chunk")
            } /* end if */

            /* De-select the chunk space */
            if (H5S_select_none(fspace) < 0) {
                (void)H5S_close(fspace);
                chunk_info = H5FL_FREE(H5D_chunk_info_t, chunk_info);
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "unable to de-select dataspace")
            } /* end if */

            /* Set the file chunk dataspace */
            chunk_info->fspace        = fspace;
            chunk_info->fspace_shared = FALSE;

            /* Set the memory chunk dataspace */
            chunk_info->mspace        = NULL;
            chunk_info->mspace_shared = FALSE;

            /* Set the number of selected elements in chunk to zero */
            chunk_info->chunk_points = 0;

            /* Set the chunk's scaled coordinates */
            H5MM_memcpy(chunk_info->scaled, scaled, sizeof(hsize_t) * fm->f_ndims);
            chunk_info->scaled[fm->f_ndims] = 0;

            /* Insert the new chunk into the skip list */
            if (H5SL_insert(fm->sel_chunks, chunk_info, &chunk_info->index) < 0) {
                H5D__free_chunk_info(chunk_info, NULL, NULL);
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINSERT, FAIL, "can't insert chunk into skip list")
            } /* end if */
        }     /* end if */

#ifdef H5_HAVE_PARALLEL
        /* Store chunk selection information, for collective multi-chunk I/O */
        if (udata->io_info->using_mpi_vfd)
            fm->select_chunk[chunk_index] = chunk_info;
#endif /* H5_HAVE_PARALLEL */

        /* Update the "last chunk seen" information */
        fm->last_index      = chunk_index;
        fm->last_chunk_info = chunk_info;
    } /* end else */

    /* Get the offset of the element within the chunk */
    for (u = 0; u < fm->f_ndims; u++)
        coords_in_chunk[u] = coords[u] - (scaled[u] * fm->layout->u.chunk.dim[u]);

    /* Add point to file selection for chunk */
    if (H5S_select_elements(chunk_info->fspace, H5S_SELECT_APPEND, (size_t)1, coords_in_chunk) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTSELECT, FAIL, "unable to select element")

    /* Increment the number of elemented selected in chunk */
    chunk_info->chunk_points++;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_file_cb() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_mem_cb
 *
 * Purpose:    Callback routine for file selection iterator.  Used when
 *              creating selections in memory for each chunk.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Raymond Lu
 *        Thursday, April 10, 2003
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_mem_cb(void H5_ATTR_UNUSED *elem, const H5T_t H5_ATTR_UNUSED *type, unsigned ndims,
                  const hsize_t *coords, void *_fm)
{
    H5D_chunk_map_t * fm = (H5D_chunk_map_t *)_fm; /* File<->memory chunk mapping info */
    H5D_chunk_info_t *chunk_info;                  /* Chunk information for current chunk */
    hsize_t           coords_in_mem[H5S_MAX_RANK]; /* Coordinates of element in memory */
    hsize_t           chunk_index;                 /* Chunk index */
    herr_t            ret_value = SUCCEED;         /* Return value        */

    FUNC_ENTER_PACKAGE

    /* Calculate the index of this chunk */
    chunk_index = H5VM_chunk_index(ndims, coords, fm->layout->u.chunk.dim, fm->layout->u.chunk.down_chunks);

    /* Find correct chunk in file & memory skip list */
    if (chunk_index == fm->last_index) {
        /* If the chunk index is the same as the last chunk index we used,
         * get the cached spaces to operate on.
         */
        chunk_info = fm->last_chunk_info;
    } /* end if */
    else {
        /* If the chunk index is not the same as the last chunk index we used,
         * find the chunk in the skip list.
         */
        /* Get the chunk node from the skip list */
        if (NULL == (chunk_info = (H5D_chunk_info_t *)H5SL_search(fm->sel_chunks, &chunk_index)))
            HGOTO_ERROR(H5E_DATASPACE, H5E_NOTFOUND, H5_ITER_ERROR, "can't locate chunk in skip list")

        /* Check if the chunk already has a memory space */
        if (NULL == chunk_info->mspace)
            /* Copy the template memory chunk dataspace */
            if (NULL == (chunk_info->mspace = H5S_copy(fm->mchunk_tmpl, FALSE, FALSE)))
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOPY, H5_ITER_ERROR, "unable to copy file space")

        /* Update the "last chunk seen" information */
        fm->last_index      = chunk_index;
        fm->last_chunk_info = chunk_info;
    } /* end else */

    /* Get coordinates of selection iterator for memory */
    if (H5S_SELECT_ITER_COORDS(&fm->mem_iter, coords_in_mem) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGET, H5_ITER_ERROR, "unable to get iterator coordinates")

    /* Add point to memory selection for chunk */
    if (fm->msel_type == H5S_SEL_POINTS) {
        if (H5S_select_elements(chunk_info->mspace, H5S_SELECT_APPEND, (size_t)1, coords_in_mem) < 0)
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTSELECT, H5_ITER_ERROR, "unable to select element")
    } /* end if */
    else {
        if (H5S_hyper_add_span_element(chunk_info->mspace, fm->m_ndims, coords_in_mem) < 0)
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTSELECT, H5_ITER_ERROR, "unable to select element")
    } /* end else */

    /* Move memory selection iterator to next element in selection */
    if (H5S_SELECT_ITER_NEXT(&fm->mem_iter, (size_t)1) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTNEXT, H5_ITER_ERROR, "unable to move to next iterator location")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_mem_cb() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_cacheable
 *
 * Purpose:    A small internal function to if it's possible to load the
 *              chunk into cache.
 *
 * Return:    TRUE or FALSE
 *
 * Programmer:    Raymond Lu
 *        17 July 2007
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5D__chunk_cacheable(const H5D_io_info_t *io_info, haddr_t caddr, hbool_t write_op)
{
    const H5D_t *dataset     = io_info->dset; /* Local pointer to dataset info */
    hbool_t      has_filters = FALSE;         /* Whether there are filters on the chunk or not */
    htri_t       ret_value   = FAIL;          /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    HDassert(io_info);
    HDassert(dataset);

    /* Must bring the whole chunk in if there are any filters on the chunk.
     * Make sure to check if filters are on the dataset but disabled for the
     * chunk because it is a partial edge chunk. */
    if (dataset->shared->dcpl_cache.pline.nused > 0) {
        if (dataset->shared->layout.u.chunk.flags & H5O_LAYOUT_CHUNK_DONT_FILTER_PARTIAL_BOUND_CHUNKS) {
            has_filters = !H5D__chunk_is_partial_edge_chunk(
                io_info->dset->shared->ndims, io_info->dset->shared->layout.u.chunk.dim,
                io_info->store->chunk.scaled, io_info->dset->shared->curr_dims);
        } /* end if */
        else
            has_filters = TRUE;
    } /* end if */

    if (has_filters)
        ret_value = TRUE;
    else {
#ifdef H5_HAVE_PARALLEL
        /* If MPI based VFD is used and the file is opened for write access, must
         *         bypass the chunk-cache scheme because other MPI processes could
         *         be writing to other elements in the same chunk.  Do a direct
         *         write-through of only the elements requested.
         */
        if (io_info->using_mpi_vfd && (H5F_ACC_RDWR & H5F_INTENT(dataset->oloc.file)))
            ret_value = FALSE;
        else {
#endif /* H5_HAVE_PARALLEL */
            /* If the chunk is too large to keep in the cache and if we don't
             * need to write the fill value, then don't load the chunk into the
             * cache, just write the data to it directly.
             */
            H5_CHECK_OVERFLOW(dataset->shared->layout.u.chunk.size, uint32_t, size_t);
            if ((size_t)dataset->shared->layout.u.chunk.size > dataset->shared->cache.chunk.nbytes_max) {
                if (write_op && !H5F_addr_defined(caddr)) {
                    const H5O_fill_t *fill = &(dataset->shared->dcpl_cache.fill); /* Fill value info */
                    H5D_fill_value_t  fill_status;                                /* Fill value status */

                    /* Revtrieve the fill value status */
                    if (H5P_is_fill_value_defined(fill, &fill_status) < 0)
                        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't tell if fill value defined")

                    /* If the fill value needs to be written then we will need
                     * to use the cache to write the fill value */
                    if (fill->fill_time == H5D_FILL_TIME_ALLOC ||
                        (fill->fill_time == H5D_FILL_TIME_IFSET &&
                         (fill_status == H5D_FILL_VALUE_USER_DEFINED ||
                          fill_status == H5D_FILL_VALUE_DEFAULT)))
                        ret_value = TRUE;
                    else
                        ret_value = FALSE;
                }
                else
                    ret_value = FALSE;
            }
            else
                ret_value = TRUE;
#ifdef H5_HAVE_PARALLEL
        } /* end else */
#endif    /* H5_HAVE_PARALLEL */
    }     /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_cacheable() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_may_use_select_io
 *
 * Purpose:    A small internal function to if it may be possible to use
 *             selection I/O.
 *
 * Return:    TRUE or FALSE
 *
 * Programmer:    Neil Fortner
 *        4 May 2021
 *
 *-------------------------------------------------------------------------
 */
static htri_t
H5D__chunk_may_use_select_io(const H5D_io_info_t *io_info)
{
    const H5D_t *dataset   = NULL; /* Local pointer to dataset info */
    htri_t       ret_value = FAIL; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    HDassert(io_info);

    dataset = io_info->dset;
    HDassert(dataset);

    /* Don't use selection I/O if it's globally disabled, there is a type
     * conversion, or if there are filters on the dataset (for now) */
    if (!H5_use_selection_io_g || io_info->io_ops.single_read != H5D__select_read ||
        dataset->shared->dcpl_cache.pline.nused > 0)
        ret_value = FALSE;
    else {
        hbool_t page_buf_enabled;

        HDassert(io_info->io_ops.single_write == H5D__select_write);

        /* Check if the page buffer is enabled */
        if (H5PB_enabled(io_info->f_sh, H5FD_MEM_DRAW, &page_buf_enabled) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't check if page buffer is enabled")
        if (page_buf_enabled)
            ret_value = FALSE;
        else {
            /* Check if chunks in this dataset may be cached, if so don't use
             * selection I/O (for now).  Note that chunks temporarily cached for
             * the purpose of writing the fill value don't count, since they are
             * immediately evicted. */
#ifdef H5_HAVE_PARALLEL
            /* If MPI based VFD is used and the file is opened for write access,
             * must bypass the chunk-cache scheme because other MPI processes
             * could be writing to other elements in the same chunk.
             */
            if (io_info->using_mpi_vfd && (H5F_ACC_RDWR & H5F_INTENT(dataset->oloc.file)))
                ret_value = TRUE;
            else {
#endif /* H5_HAVE_PARALLEL */
                /* Check if the chunk is too large to keep in the cache */
                H5_CHECK_OVERFLOW(dataset->shared->layout.u.chunk.size, uint32_t, size_t);
                if ((size_t)dataset->shared->layout.u.chunk.size > dataset->shared->cache.chunk.nbytes_max)
                    ret_value = TRUE;
                else
                    ret_value = FALSE;
#ifdef H5_HAVE_PARALLEL
            } /* end else */
#endif        /* H5_HAVE_PARALLEL */
        }     /* end else */
    }         /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_may_use_select_io() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_read
 *
 * Purpose:    Read from a chunked dataset.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Raymond Lu
 *        Thursday, April 10, 2003
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_read(H5D_io_info_t *io_info, const H5D_type_info_t *type_info, hsize_t H5_ATTR_UNUSED nelmts,
                H5S_t H5_ATTR_UNUSED *file_space, H5S_t H5_ATTR_UNUSED *mem_space, H5D_chunk_map_t *fm)
{
    H5SL_node_t * chunk_node;                  /* Current node in chunk skip list */
    H5D_io_info_t nonexistent_io_info;         /* "nonexistent" I/O info object */
    uint32_t      src_accessed_bytes  = 0;     /* Total accessed size in a chunk */
    hbool_t       skip_missing_chunks = FALSE; /* Whether to skip missing chunks */
    H5S_t **      chunk_mem_spaces    = NULL;  /* Array of chunk memory spaces */
    H5S_t *       chunk_mem_spaces_static[8];  /* Static buffer for chunk_mem_spaces */
    H5S_t **      chunk_file_spaces = NULL;    /* Array of chunk file spaces */
    H5S_t *       chunk_file_spaces_static[8]; /* Static buffer for chunk_file_spaces */
    haddr_t *     chunk_addrs = NULL;          /* Array of chunk addresses */
    haddr_t       chunk_addrs_static[8];       /* Static buffer for chunk_addrs */
    herr_t        ret_value = SUCCEED;         /*return value        */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    HDassert(io_info);
    HDassert(io_info->u.rbuf);
    HDassert(type_info);
    HDassert(fm);

    /* Set up "nonexistent" I/O info object */
    H5MM_memcpy(&nonexistent_io_info, io_info, sizeof(nonexistent_io_info));
    nonexistent_io_info.layout_ops = *H5D_LOPS_NONEXISTENT;

    {
        const H5O_fill_t *fill = &(io_info->dset->shared->dcpl_cache.fill); /* Fill value info */
        H5D_fill_value_t  fill_status;                                      /* Fill value status */

        /* Check the fill value status */
        if (H5P_is_fill_value_defined(fill, &fill_status) < 0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't tell if fill value defined")

        /* If we are never to return fill values, or if we would return them
         * but they aren't set, set the flag to skip missing chunks.
         */
        if (fill->fill_time == H5D_FILL_TIME_NEVER ||
            (fill->fill_time == H5D_FILL_TIME_IFSET && fill_status != H5D_FILL_VALUE_USER_DEFINED &&
             fill_status != H5D_FILL_VALUE_DEFAULT))
            skip_missing_chunks = TRUE;
    }

    /* Different blocks depending on whether we're using selection I/O */
    if (io_info->use_select_io) {
        size_t num_chunks;
        size_t element_sizes[2] = {type_info->dst_type_size, 0};
        void * bufs[2]          = {io_info->u.rbuf, NULL};

        /* Cache number of chunks */
        num_chunks = H5D_CHUNK_GET_NODE_COUNT(fm);

        /* Allocate arrays of dataspaces and offsets for use with selection I/O,
         * or point to static buffers */
        HDassert(sizeof(chunk_mem_spaces_static) / sizeof(chunk_mem_spaces_static[0]) ==
                 sizeof(chunk_file_spaces_static) / sizeof(chunk_file_spaces_static[0]));
        HDassert(sizeof(chunk_mem_spaces_static) / sizeof(chunk_mem_spaces_static[0]) ==
                 sizeof(chunk_addrs_static) / sizeof(chunk_addrs_static[0]));
        if (num_chunks > (sizeof(chunk_mem_spaces_static) / sizeof(chunk_mem_spaces_static[0]))) {
            if (NULL == (chunk_mem_spaces = H5MM_malloc(num_chunks * sizeof(H5S_t *))))
                HGOTO_ERROR(H5E_RESOURCE, H5E_CANTALLOC, FAIL,
                            "memory allocation failed for memory space list")
            if (NULL == (chunk_file_spaces = H5MM_malloc(num_chunks * sizeof(H5S_t *))))
                HGOTO_ERROR(H5E_RESOURCE, H5E_CANTALLOC, FAIL, "memory allocation failed for file space list")
            if (NULL == (chunk_addrs = H5MM_malloc(num_chunks * sizeof(haddr_t))))
                HGOTO_ERROR(H5E_RESOURCE, H5E_CANTALLOC, FAIL,
                            "memory allocation failed for chunk address list")
        } /* end if */
        else {
            chunk_mem_spaces  = chunk_mem_spaces_static;
            chunk_file_spaces = chunk_file_spaces_static;
            chunk_addrs       = chunk_addrs_static;
        } /* end else */

        /* Reset num_chunks */
        num_chunks = 0;

        /* Iterate through nodes in chunk skip list */
        chunk_node = H5D_CHUNK_GET_FIRST_NODE(fm);
        while (chunk_node) {
            H5D_chunk_info_t *chunk_info; /* Chunk information */
            H5D_chunk_ud_t    udata;      /* Chunk index pass-through    */

            /* Get the actual chunk information from the skip list node */
            chunk_info = H5D_CHUNK_GET_NODE_INFO(fm, chunk_node);

            /* Get the info for the chunk in the file */
            if (H5D__chunk_lookup(io_info->dset, chunk_info->scaled, &udata) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "error looking up chunk address")

            /* There should be no chunks cached */
            HDassert(UINT_MAX == udata.idx_hint);

            /* Sanity check */
            HDassert((H5F_addr_defined(udata.chunk_block.offset) && udata.chunk_block.length > 0) ||
                     (!H5F_addr_defined(udata.chunk_block.offset) && udata.chunk_block.length == 0));

            /* Check for non-existent chunk & skip it if appropriate */
            if (H5F_addr_defined(udata.chunk_block.offset)) {
                /* Add chunk to list for selection I/O */
                chunk_mem_spaces[num_chunks]  = chunk_info->mspace;
                chunk_file_spaces[num_chunks] = chunk_info->fspace;
                chunk_addrs[num_chunks]       = udata.chunk_block.offset;
                num_chunks++;
            } /* end if */
            else if (!skip_missing_chunks) {
                /* Perform the actual read operation from the nonexistent chunk
                 */
                if ((io_info->io_ops.single_read)(&nonexistent_io_info, type_info,
                                                  (hsize_t)chunk_info->chunk_points, chunk_info->fspace,
                                                  chunk_info->mspace) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "chunked read failed")
            } /* end if */

            /* Advance to next chunk in list */
            chunk_node = H5D_CHUNK_GET_NEXT_NODE(fm, chunk_node);
        } /* end while */

        /* Issue selection I/O call (we can skip the page buffer because we've
         * already verified it won't be used, and the metadata accumulator
         * because this is raw data) */
        if (H5F_shared_select_read(H5F_SHARED(io_info->dset->oloc.file), H5FD_MEM_DRAW, (uint32_t)num_chunks,
                                   chunk_mem_spaces, chunk_file_spaces, chunk_addrs, element_sizes, bufs) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "chunk selection read failed")

        /* Clean up memory */
        if (chunk_mem_spaces != chunk_mem_spaces_static) {
            HDassert(chunk_mem_spaces);
            HDassert(chunk_file_spaces != chunk_file_spaces_static);
            HDassert(chunk_addrs != chunk_addrs_static);
            H5MM_free(chunk_mem_spaces);
            chunk_mem_spaces = NULL;
            H5MM_free(chunk_file_spaces);
            chunk_file_spaces = NULL;
            H5MM_free(chunk_addrs);
            chunk_addrs = NULL;
        } /* end if */
    }     /* end if */
    else {
        H5D_io_info_t ctg_io_info; /* Contiguous I/O info object */
        H5D_storage_t ctg_store;   /* Chunk storage information as contiguous dataset */
        H5D_io_info_t cpt_io_info; /* Compact I/O info object */
        H5D_storage_t cpt_store;   /* Chunk storage information as compact dataset */
        hbool_t       cpt_dirty;   /* Temporary placeholder for compact storage "dirty" flag */

        /* Set up contiguous I/O info object */
        H5MM_memcpy(&ctg_io_info, io_info, sizeof(ctg_io_info));
        ctg_io_info.store      = &ctg_store;
        ctg_io_info.layout_ops = *H5D_LOPS_CONTIG;

        /* Initialize temporary contiguous storage info */
        H5_CHECKED_ASSIGN(ctg_store.contig.dset_size, hsize_t, io_info->dset->shared->layout.u.chunk.size,
                          uint32_t);

        /* Set up compact I/O info object */
        H5MM_memcpy(&cpt_io_info, io_info, sizeof(cpt_io_info));
        cpt_io_info.store      = &cpt_store;
        cpt_io_info.layout_ops = *H5D_LOPS_COMPACT;

        /* Initialize temporary compact storage info */
        cpt_store.compact.dirty = &cpt_dirty;

        /* Iterate through nodes in chunk skip list */
        chunk_node = H5D_CHUNK_GET_FIRST_NODE(fm);
        while (chunk_node) {
            H5D_chunk_info_t *chunk_info; /* Chunk information */
            H5D_chunk_ud_t    udata;      /* Chunk index pass-through    */
            htri_t            cacheable;  /* Whether the chunk is cacheable */

            /* Get the actual chunk information from the skip list node */
            chunk_info = H5D_CHUNK_GET_NODE_INFO(fm, chunk_node);

            /* Get the info for the chunk in the file */
            if (H5D__chunk_lookup(io_info->dset, chunk_info->scaled, &udata) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "error looking up chunk address")

            /* Sanity check */
            HDassert((H5F_addr_defined(udata.chunk_block.offset) && udata.chunk_block.length > 0) ||
                     (!H5F_addr_defined(udata.chunk_block.offset) && udata.chunk_block.length == 0));

            /* Check for non-existent chunk & skip it if appropriate */
            if (H5F_addr_defined(udata.chunk_block.offset) || UINT_MAX != udata.idx_hint ||
                !skip_missing_chunks) {
                H5D_io_info_t *chk_io_info;  /* Pointer to I/O info object for this chunk */
                void *         chunk = NULL; /* Pointer to locked chunk buffer */

                /* Set chunk's [scaled] coordinates */
                io_info->store->chunk.scaled = chunk_info->scaled;

                /* Determine if we should use the chunk cache */
                if ((cacheable = H5D__chunk_cacheable(io_info, udata.chunk_block.offset, FALSE)) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't tell if chunk is cacheable")
                if (cacheable) {
                    /* Load the chunk into cache and lock it. */

                    /* Compute # of bytes accessed in chunk */
                    H5_CHECK_OVERFLOW(type_info->src_type_size, /*From:*/ size_t, /*To:*/ uint32_t);
                    src_accessed_bytes = chunk_info->chunk_points * (uint32_t)type_info->src_type_size;

                    /* Lock the chunk into the cache */
                    if (NULL == (chunk = H5D__chunk_lock(io_info, &udata, FALSE, FALSE)))
                        HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "unable to read raw data chunk")

                    /* Set up the storage buffer information for this chunk */
                    cpt_store.compact.buf = chunk;

                    /* Point I/O info at contiguous I/O info for this chunk */
                    chk_io_info = &cpt_io_info;
                } /* end if */
                else if (H5F_addr_defined(udata.chunk_block.offset)) {
                    /* Set up the storage address information for this chunk */
                    ctg_store.contig.dset_addr = udata.chunk_block.offset;

                    /* Point I/O info at temporary I/O info for this chunk */
                    chk_io_info = &ctg_io_info;
                } /* end else if */
                else {
                    /* Point I/O info at "nonexistent" I/O info for this chunk */
                    chk_io_info = &nonexistent_io_info;
                } /* end else */

                /* Perform the actual read operation */
                if ((io_info->io_ops.single_read)(chk_io_info, type_info, (hsize_t)chunk_info->chunk_points,
                                                  chunk_info->fspace, chunk_info->mspace) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "chunked read failed")

                /* Release the cache lock on the chunk. */
                if (chunk && H5D__chunk_unlock(io_info, &udata, FALSE, chunk, src_accessed_bytes) < 0)
                    HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "unable to unlock raw data chunk")
            } /* end if */

            /* Advance to next chunk in list */
            chunk_node = H5D_CHUNK_GET_NEXT_NODE(fm, chunk_node);
        } /* end while */
    }     /* end else */

done:
    /* Cleanup on failure */
    if (ret_value < 0) {
        if (chunk_mem_spaces != chunk_mem_spaces_static)
            chunk_mem_spaces = H5MM_xfree(chunk_mem_spaces);
        if (chunk_file_spaces != chunk_file_spaces_static)
            chunk_file_spaces = H5MM_xfree(chunk_file_spaces);
        if (chunk_addrs != chunk_addrs_static)
            chunk_addrs = H5MM_xfree(chunk_addrs);
    } /* end if */

    /* Make sure we cleaned up */
    HDassert(!chunk_mem_spaces || chunk_mem_spaces == chunk_mem_spaces_static);
    HDassert(!chunk_file_spaces || chunk_file_spaces == chunk_file_spaces_static);
    HDassert(!chunk_addrs || chunk_addrs == chunk_addrs_static);

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D__chunk_read() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_write
 *
 * Purpose:    Writes to a chunked dataset.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Raymond Lu
 *        Thursday, April 10, 2003
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_write(H5D_io_info_t *io_info, const H5D_type_info_t *type_info, hsize_t H5_ATTR_UNUSED nelmts,
                 H5S_t H5_ATTR_UNUSED *file_space, H5S_t H5_ATTR_UNUSED *mem_space, H5D_chunk_map_t *fm)
{
    H5SL_node_t * chunk_node;                  /* Current node in chunk skip list */
    H5D_io_info_t ctg_io_info;                 /* Contiguous I/O info object */
    H5D_storage_t ctg_store;                   /* Chunk storage information as contiguous dataset */
    H5D_io_info_t cpt_io_info;                 /* Compact I/O info object */
    H5D_storage_t cpt_store;                   /* Chunk storage information as compact dataset */
    hbool_t       cpt_dirty;                   /* Temporary placeholder for compact storage "dirty" flag */
    uint32_t      dst_accessed_bytes = 0;      /* Total accessed size in a chunk */
    H5S_t **      chunk_mem_spaces   = NULL;   /* Array of chunk memory spaces */
    H5S_t *       chunk_mem_spaces_static[8];  /* Static buffer for chunk_mem_spaces */
    H5S_t **      chunk_file_spaces = NULL;    /* Array of chunk file spaces */
    H5S_t *       chunk_file_spaces_static[8]; /* Static buffer for chunk_file_spaces */
    haddr_t *     chunk_addrs = NULL;          /* Array of chunk addresses */
    haddr_t       chunk_addrs_static[8];       /* Static buffer for chunk_addrs */
    herr_t        ret_value = SUCCEED;         /* Return value        */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    HDassert(io_info);
    HDassert(io_info->u.wbuf);
    HDassert(type_info);
    HDassert(fm);

    /* Set up contiguous I/O info object */
    H5MM_memcpy(&ctg_io_info, io_info, sizeof(ctg_io_info));
    ctg_io_info.store      = &ctg_store;
    ctg_io_info.layout_ops = *H5D_LOPS_CONTIG;

    /* Initialize temporary contiguous storage info */
    H5_CHECKED_ASSIGN(ctg_store.contig.dset_size, hsize_t, io_info->dset->shared->layout.u.chunk.size,
                      uint32_t);

    /* Set up compact I/O info object */
    H5MM_memcpy(&cpt_io_info, io_info, sizeof(cpt_io_info));
    cpt_io_info.store      = &cpt_store;
    cpt_io_info.layout_ops = *H5D_LOPS_COMPACT;

    /* Initialize temporary compact storage info */
    cpt_store.compact.dirty = &cpt_dirty;

    /* Different blocks depending on whether we're using selection I/O */
    if (io_info->use_select_io) {
        size_t      num_chunks;
        size_t      element_sizes[2] = {type_info->dst_type_size, 0};
        const void *bufs[2]          = {io_info->u.wbuf, NULL};

        /* Cache number of chunks */
        num_chunks = H5D_CHUNK_GET_NODE_COUNT(fm);

        /* Allocate arrays of dataspaces and offsets for use with selection I/O,
         * or point to static buffers */
        HDassert(sizeof(chunk_mem_spaces_static) / sizeof(chunk_mem_spaces_static[0]) ==
                 sizeof(chunk_file_spaces_static) / sizeof(chunk_file_spaces_static[0]));
        HDassert(sizeof(chunk_mem_spaces_static) / sizeof(chunk_mem_spaces_static[0]) ==
                 sizeof(chunk_addrs_static) / sizeof(chunk_addrs_static[0]));
        if (num_chunks > (sizeof(chunk_mem_spaces_static) / sizeof(chunk_mem_spaces_static[0]))) {
            if (NULL == (chunk_mem_spaces = H5MM_malloc(num_chunks * sizeof(H5S_t *))))
                HGOTO_ERROR(H5E_RESOURCE, H5E_CANTALLOC, FAIL,
                            "memory allocation failed for memory space list")
            if (NULL == (chunk_file_spaces = H5MM_malloc(num_chunks * sizeof(H5S_t *))))
                HGOTO_ERROR(H5E_RESOURCE, H5E_CANTALLOC, FAIL, "memory allocation failed for file space list")
            if (NULL == (chunk_addrs = H5MM_malloc(num_chunks * sizeof(haddr_t))))
                HGOTO_ERROR(H5E_RESOURCE, H5E_CANTALLOC, FAIL,
                            "memory allocation failed for chunk address list")
        } /* end if */
        else {
            chunk_mem_spaces  = chunk_mem_spaces_static;
            chunk_file_spaces = chunk_file_spaces_static;
            chunk_addrs       = chunk_addrs_static;
        } /* end else */

        /* Reset num_chunks */
        num_chunks = 0;

        /* Iterate through nodes in chunk skip list */
        chunk_node = H5D_CHUNK_GET_FIRST_NODE(fm);
        while (chunk_node) {
            H5D_chunk_info_t * chunk_info; /* Chunk information */
            H5D_chk_idx_info_t idx_info;   /* Chunked index info */
            H5D_chunk_ud_t     udata;      /* Index pass-through    */
            htri_t             cacheable;  /* Whether the chunk is cacheable */
            hbool_t need_insert = FALSE;   /* Whether the chunk needs to be inserted into the index */

            /* Get the actual chunk information from the skip list node */
            chunk_info = H5D_CHUNK_GET_NODE_INFO(fm, chunk_node);

            /* Get the info for the chunk in the file */
            if (H5D__chunk_lookup(io_info->dset, chunk_info->scaled, &udata) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "error looking up chunk address")

            /* There should be no chunks cached */
            HDassert(UINT_MAX == udata.idx_hint);

            /* Sanity check */
            HDassert((H5F_addr_defined(udata.chunk_block.offset) && udata.chunk_block.length > 0) ||
                     (!H5F_addr_defined(udata.chunk_block.offset) && udata.chunk_block.length == 0));

            /* Set chunk's [scaled] coordinates */
            io_info->store->chunk.scaled = chunk_info->scaled;

            /* Determine if we should use the chunk cache */
            if ((cacheable = H5D__chunk_cacheable(io_info, udata.chunk_block.offset, TRUE)) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't tell if chunk is cacheable")
            if (cacheable) {
                /* Load the chunk into cache.  But if the whole chunk is written,
                 * simply allocate space instead of load the chunk. */
                void *  chunk;               /* Pointer to locked chunk buffer */
                hbool_t entire_chunk = TRUE; /* Whether whole chunk is selected */

                /* Compute # of bytes accessed in chunk */
                H5_CHECK_OVERFLOW(type_info->dst_type_size, /*From:*/ size_t, /*To:*/ uint32_t);
                dst_accessed_bytes = chunk_info->chunk_points * (uint32_t)type_info->dst_type_size;

                /* Determine if we will access all the data in the chunk */
                if (dst_accessed_bytes != ctg_store.contig.dset_size ||
                    (chunk_info->chunk_points * type_info->src_type_size) != ctg_store.contig.dset_size ||
                    fm->fsel_type == H5S_SEL_POINTS)
                    entire_chunk = FALSE;

                /* Lock the chunk into the cache */
                if (NULL == (chunk = H5D__chunk_lock(io_info, &udata, entire_chunk, FALSE)))
                    HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "unable to read raw data chunk")

                /* Set up the storage buffer information for this chunk */
                cpt_store.compact.buf = chunk;

                /* Perform the actual write operation */
                if ((io_info->io_ops.single_write)(&cpt_io_info, type_info, (hsize_t)chunk_info->chunk_points,
                                                   chunk_info->fspace, chunk_info->mspace) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "chunked write failed")

                /* Release the cache lock on the chunk */
                if (H5D__chunk_unlock(io_info, &udata, TRUE, chunk, dst_accessed_bytes) < 0)
                    HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "unable to unlock raw data chunk")
            } /* end if */
            else {
                /* If the chunk hasn't been allocated on disk, do so now. */
                if (!H5F_addr_defined(udata.chunk_block.offset)) {
                    /* Compose chunked index info struct */
                    idx_info.f       = io_info->dset->oloc.file;
                    idx_info.pline   = &(io_info->dset->shared->dcpl_cache.pline);
                    idx_info.layout  = &(io_info->dset->shared->layout.u.chunk);
                    idx_info.storage = &(io_info->dset->shared->layout.storage.u.chunk);

                    /* Set up the size of chunk for user data */
                    udata.chunk_block.length = io_info->dset->shared->layout.u.chunk.size;

                    /* Allocate the chunk */
                    if (H5D__chunk_file_alloc(&idx_info, NULL, &udata.chunk_block, &need_insert,
                                              chunk_info->scaled) < 0)
                        HGOTO_ERROR(H5E_DATASET, H5E_CANTINSERT, FAIL,
                                    "unable to insert/resize chunk on chunk level")

                    /* Make sure the address of the chunk is returned. */
                    if (!H5F_addr_defined(udata.chunk_block.offset))
                        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "chunk address isn't defined")

                    /* Cache the new chunk information */
                    H5D__chunk_cinfo_cache_update(&io_info->dset->shared->cache.chunk.last, &udata);

                    /* Insert chunk into index */
                    if (need_insert && io_info->dset->shared->layout.storage.u.chunk.ops->insert)
                        if ((io_info->dset->shared->layout.storage.u.chunk.ops->insert)(&idx_info, &udata,
                                                                                        NULL) < 0)
                            HGOTO_ERROR(H5E_DATASET, H5E_CANTINSERT, FAIL,
                                        "unable to insert chunk addr into index")
                } /* end if */

                /* Add chunk to list for selection I/O */
                chunk_mem_spaces[num_chunks]  = chunk_info->mspace;
                chunk_file_spaces[num_chunks] = chunk_info->fspace;
                chunk_addrs[num_chunks]       = udata.chunk_block.offset;
                num_chunks++;
            } /* end else */

            /* Advance to next chunk in list */
            chunk_node = H5D_CHUNK_GET_NEXT_NODE(fm, chunk_node);
        } /* end while */

        /* Issue selection I/O call (we can skip the page buffer because we've
         * already verified it won't be used, and the metadata accumulator
         * because this is raw data) */
        if (H5F_shared_select_write(H5F_SHARED(io_info->dset->oloc.file), H5FD_MEM_DRAW, (uint32_t)num_chunks,
                                    chunk_mem_spaces, chunk_file_spaces, chunk_addrs, element_sizes,
                                    bufs) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "chunk selection read failed")

        /* Clean up memory */
        if (chunk_mem_spaces != chunk_mem_spaces_static) {
            HDassert(chunk_mem_spaces);
            HDassert(chunk_file_spaces != chunk_file_spaces_static);
            HDassert(chunk_addrs != chunk_addrs_static);
            H5MM_free(chunk_mem_spaces);
            chunk_mem_spaces = NULL;
            H5MM_free(chunk_file_spaces);
            chunk_file_spaces = NULL;
            H5MM_free(chunk_addrs);
            chunk_addrs = NULL;
        } /* end if */
    }     /* end if */
    else {
        /* Iterate through nodes in chunk skip list */
        chunk_node = H5D_CHUNK_GET_FIRST_NODE(fm);
        while (chunk_node) {
            H5D_chunk_info_t * chunk_info;  /* Chunk information */
            H5D_chk_idx_info_t idx_info;    /* Chunked index info */
            H5D_io_info_t *    chk_io_info; /* Pointer to I/O info object for this chunk */
            void *             chunk;       /* Pointer to locked chunk buffer */
            H5D_chunk_ud_t     udata;       /* Index pass-through    */
            htri_t             cacheable;   /* Whether the chunk is cacheable */
            hbool_t need_insert = FALSE;    /* Whether the chunk needs to be inserted into the index */

            /* Get the actual chunk information from the skip list node */
            chunk_info = H5D_CHUNK_GET_NODE_INFO(fm, chunk_node);

            /* Look up the chunk */
            if (H5D__chunk_lookup(io_info->dset, chunk_info->scaled, &udata) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "error looking up chunk address")

            /* Sanity check */
            HDassert((H5F_addr_defined(udata.chunk_block.offset) && udata.chunk_block.length > 0) ||
                     (!H5F_addr_defined(udata.chunk_block.offset) && udata.chunk_block.length == 0));

            /* Set chunk's [scaled] coordinates */
            io_info->store->chunk.scaled = chunk_info->scaled;

            /* Determine if we should use the chunk cache */
            if ((cacheable = H5D__chunk_cacheable(io_info, udata.chunk_block.offset, TRUE)) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't tell if chunk is cacheable")
            if (cacheable) {
                /* Load the chunk into cache.  But if the whole chunk is written,
                 * simply allocate space instead of load the chunk. */
                hbool_t entire_chunk = TRUE; /* Whether whole chunk is selected */

                /* Compute # of bytes accessed in chunk */
                H5_CHECK_OVERFLOW(type_info->dst_type_size, /*From:*/ size_t, /*To:*/ uint32_t);
                dst_accessed_bytes = chunk_info->chunk_points * (uint32_t)type_info->dst_type_size;

                /* Determine if we will access all the data in the chunk */
                if (dst_accessed_bytes != ctg_store.contig.dset_size ||
                    (chunk_info->chunk_points * type_info->src_type_size) != ctg_store.contig.dset_size ||
                    fm->fsel_type == H5S_SEL_POINTS)
                    entire_chunk = FALSE;

                /* Lock the chunk into the cache */
                if (NULL == (chunk = H5D__chunk_lock(io_info, &udata, entire_chunk, FALSE)))
                    HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "unable to read raw data chunk")

                /* Set up the storage buffer information for this chunk */
                cpt_store.compact.buf = chunk;

                /* Point I/O info at main I/O info for this chunk */
                chk_io_info = &cpt_io_info;
            } /* end if */
            else {
                /* If the chunk hasn't been allocated on disk, do so now. */
                if (!H5F_addr_defined(udata.chunk_block.offset)) {
                    /* Compose chunked index info struct */
                    idx_info.f       = io_info->dset->oloc.file;
                    idx_info.pline   = &(io_info->dset->shared->dcpl_cache.pline);
                    idx_info.layout  = &(io_info->dset->shared->layout.u.chunk);
                    idx_info.storage = &(io_info->dset->shared->layout.storage.u.chunk);

                    /* Set up the size of chunk for user data */
                    udata.chunk_block.length = io_info->dset->shared->layout.u.chunk.size;

                    /* Allocate the chunk */
                    if (H5D__chunk_file_alloc(&idx_info, NULL, &udata.chunk_block, &need_insert,
                                              chunk_info->scaled) < 0)
                        HGOTO_ERROR(H5E_DATASET, H5E_CANTINSERT, FAIL,
                                    "unable to insert/resize chunk on chunk level")

                    /* Make sure the address of the chunk is returned. */
                    if (!H5F_addr_defined(udata.chunk_block.offset))
                        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "chunk address isn't defined")

                    /* Cache the new chunk information */
                    H5D__chunk_cinfo_cache_update(&io_info->dset->shared->cache.chunk.last, &udata);
                } /* end if */

                /* Set up the storage address information for this chunk */
                ctg_store.contig.dset_addr = udata.chunk_block.offset;

                /* No chunk cached */
                chunk = NULL;

                /* Point I/O info at temporary I/O info for this chunk */
                chk_io_info = &ctg_io_info;
            } /* end else */

            /* Perform the actual write operation */
            if ((io_info->io_ops.single_write)(chk_io_info, type_info, (hsize_t)chunk_info->chunk_points,
                                               chunk_info->fspace, chunk_info->mspace) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "chunked write failed")

            /* Release the cache lock on the chunk, or insert chunk into index. */
            if (chunk) {
                if (H5D__chunk_unlock(io_info, &udata, TRUE, chunk, dst_accessed_bytes) < 0)
                    HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "unable to unlock raw data chunk")
            } /* end if */
            else {
                if (need_insert && io_info->dset->shared->layout.storage.u.chunk.ops->insert)
                    if ((io_info->dset->shared->layout.storage.u.chunk.ops->insert)(&idx_info, &udata, NULL) <
                        0)
                        HGOTO_ERROR(H5E_DATASET, H5E_CANTINSERT, FAIL,
                                    "unable to insert chunk addr into index")
            } /* end else */

            /* Advance to next chunk in list */
            chunk_node = H5D_CHUNK_GET_NEXT_NODE(fm, chunk_node);
        } /* end while */
    }     /* end else */

done:
    /* Cleanup on failure */
    if (ret_value < 0) {
        if (chunk_mem_spaces != chunk_mem_spaces_static)
            chunk_mem_spaces = H5MM_xfree(chunk_mem_spaces);
        if (chunk_file_spaces != chunk_file_spaces_static)
            chunk_file_spaces = H5MM_xfree(chunk_file_spaces);
        if (chunk_addrs != chunk_addrs_static)
            chunk_addrs = H5MM_xfree(chunk_addrs);
    } /* end if */

    /* Make sure we cleaned up */
    HDassert(!chunk_mem_spaces || chunk_mem_spaces == chunk_mem_spaces_static);
    HDassert(!chunk_file_spaces || chunk_file_spaces == chunk_file_spaces_static);
    HDassert(!chunk_addrs || chunk_addrs == chunk_addrs_static);

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D__chunk_write() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_flush
 *
 * Purpose:    Writes all dirty chunks to disk and optionally preempts them
 *        from the cache.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *              Thursday, May 21, 1998
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_flush(H5D_t *dset)
{
    H5D_rdcc_t *    rdcc = &(dset->shared->cache.chunk);
    H5D_rdcc_ent_t *ent, *next;
    unsigned        nerrors   = 0;       /* Count of any errors encountered when flushing chunks */
    herr_t          ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    HDassert(dset);

    /* Loop over all entries in the chunk cache */
    for (ent = rdcc->head; ent; ent = next) {
        next = ent->next;
        if (H5D__chunk_flush_entry(dset, ent, FALSE) < 0)
            nerrors++;
    } /* end for */
    if (nerrors)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTFLUSH, FAIL, "unable to flush one or more raw data chunks")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_flush() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_io_term
 *
 * Purpose:    Destroy I/O operation information.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *        Saturday, May 17, 2003
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_io_term(const H5D_chunk_map_t *fm)
{
    herr_t ret_value = SUCCEED; /*return value        */

    FUNC_ENTER_PACKAGE

    /* Single element I/O vs. multiple element I/O cleanup */
    if (fm->use_single) {
        /* Sanity checks */
        HDassert(fm->sel_chunks == NULL);
        HDassert(fm->single_chunk_info);
        HDassert(fm->single_chunk_info->fspace_shared);
        HDassert(fm->single_chunk_info->mspace_shared);

        /* Reset the selection for the single element I/O */
        H5S_select_all(fm->single_space, TRUE);
    } /* end if */
    else {
        /* Release the nodes on the list of selected chunks */
        if (fm->sel_chunks)
            if (H5SL_free(fm->sel_chunks, H5D__free_chunk_info, NULL) < 0)
                HGOTO_ERROR(H5E_PLIST, H5E_CANTNEXT, FAIL, "can't iterate over chunks")
    } /* end else */

    /* Free the memory chunk dataspace template */
    if (fm->mchunk_tmpl)
        if (H5S_close(fm->mchunk_tmpl) < 0)
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "can't release memory chunk dataspace template")
#ifdef H5_HAVE_PARALLEL
    if (fm->select_chunk)
        H5MM_xfree(fm->select_chunk);
#endif /* H5_HAVE_PARALLEL */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_io_term() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_dest
 *
 * Purpose:    Destroy the entire chunk cache by flushing dirty entries,
 *        preempting all entries, and freeing the cache itself.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *              Thursday, May 21, 1998
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_dest(H5D_t *dset)
{
    H5D_chk_idx_info_t   idx_info;                            /* Chunked index info */
    H5D_rdcc_t *         rdcc = &(dset->shared->cache.chunk); /* Dataset's chunk cache */
    H5D_rdcc_ent_t *     ent = NULL, *next = NULL;            /* Pointer to current & next cache entries */
    int                  nerrors   = 0;                       /* Accumulated count of errors */
    H5O_storage_chunk_t *sc        = &(dset->shared->layout.storage.u.chunk);
    herr_t               ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE_TAG(dset->oloc.addr)

    /* Sanity checks */
    HDassert(dset);
    H5D_CHUNK_STORAGE_INDEX_CHK(sc);

    /* Flush all the cached chunks */
    for (ent = rdcc->head; ent; ent = next) {
        next = ent->next;
        if (H5D__chunk_cache_evict(dset, ent, TRUE) < 0)
            nerrors++;
    } /* end for */

    /* Continue even if there are failures. */
    if (nerrors)
        HDONE_ERROR(H5E_IO, H5E_CANTFLUSH, FAIL, "unable to flush one or more raw data chunks")

    /* Release cache structures */
    if (rdcc->slot)
        rdcc->slot = H5FL_SEQ_FREE(H5D_rdcc_ent_ptr_t, rdcc->slot);
    HDmemset(rdcc, 0, sizeof(H5D_rdcc_t));

    /* Compose chunked index info struct */
    idx_info.f       = dset->oloc.file;
    idx_info.pline   = &dset->shared->dcpl_cache.pline;
    idx_info.layout  = &dset->shared->layout.u.chunk;
    idx_info.storage = sc;

    /* Free any index structures */
    if (sc->ops->dest && (sc->ops->dest)(&idx_info) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "unable to release chunk index info")

done:
    FUNC_LEAVE_NOAPI_TAG(ret_value)
} /* end H5D__chunk_dest() */

/*-------------------------------------------------------------------------
 * Function:    H5D_chunk_idx_reset
 *
 * Purpose:    Reset index information
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *              Thursday, January 15, 2009
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_chunk_idx_reset(H5O_storage_chunk_t *storage, hbool_t reset_addr)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    HDassert(storage);
    HDassert(storage->ops);
    H5D_CHUNK_STORAGE_INDEX_CHK(storage);

    /* Reset index structures */
    if ((storage->ops->reset)(storage, reset_addr) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "unable to reset chunk index info")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_chunk_idx_reset() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_cinfo_cache_reset
 *
 * Purpose:    Reset the cached chunk info
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *              November 27, 2007
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_cinfo_cache_reset(H5D_chunk_cached_t *last)
{
    FUNC_ENTER_PACKAGE_NOERR

    /* Sanity check */
    HDassert(last);

    /* Indicate that the cached info is not valid */
    last->valid = FALSE;

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* H5D__chunk_cinfo_cache_reset() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_cinfo_cache_update
 *
 * Purpose:    Update the cached chunk info
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *              November 27, 2007
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_cinfo_cache_update(H5D_chunk_cached_t *last, const H5D_chunk_ud_t *udata)
{
    FUNC_ENTER_PACKAGE_NOERR

    /* Sanity check */
    HDassert(last);
    HDassert(udata);
    HDassert(udata->common.layout);
    HDassert(udata->common.scaled);

    /* Stored the information to cache */
    H5MM_memcpy(last->scaled, udata->common.scaled, sizeof(hsize_t) * udata->common.layout->ndims);
    last->addr = udata->chunk_block.offset;
    H5_CHECKED_ASSIGN(last->nbytes, uint32_t, udata->chunk_block.length, hsize_t);
    last->chunk_idx   = udata->chunk_idx;
    last->filter_mask = udata->filter_mask;

    /* Indicate that the cached info is valid */
    last->valid = TRUE;

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* H5D__chunk_cinfo_cache_update() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_cinfo_cache_found
 *
 * Purpose:    Look for chunk info in cache
 *
 * Return:    TRUE/FALSE/FAIL
 *
 * Programmer:    Quincey Koziol
 *              November 27, 2007
 *
 *-------------------------------------------------------------------------
 */
static hbool_t
H5D__chunk_cinfo_cache_found(const H5D_chunk_cached_t *last, H5D_chunk_ud_t *udata)
{
    hbool_t ret_value = FALSE; /* Return value */

    FUNC_ENTER_PACKAGE_NOERR

    /* Sanity check */
    HDassert(last);
    HDassert(udata);
    HDassert(udata->common.layout);
    HDassert(udata->common.scaled);

    /* Check if the cached information is what is desired */
    if (last->valid) {
        unsigned u; /* Local index variable */

        /* Check that the scaled offset is the same */
        for (u = 0; u < udata->common.layout->ndims; u++)
            if (last->scaled[u] != udata->common.scaled[u])
                HGOTO_DONE(FALSE)

        /* Retrieve the information from the cache */
        udata->chunk_block.offset = last->addr;
        udata->chunk_block.length = last->nbytes;
        udata->chunk_idx          = last->chunk_idx;
        udata->filter_mask        = last->filter_mask;

        /* Indicate that the data was found */
        HGOTO_DONE(TRUE)
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D__chunk_cinfo_cache_found() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_create
 *
 * Purpose:    Creates a new chunked storage index and initializes the
 *        layout information with information about the storage.  The
 *        layout info should be immediately written to the object header.
 *
 * Return:    Non-negative on success (with the layout information initialized
 *        and ready to write to an object header). Negative on failure.
 *
 * Programmer:    Quincey Koziol
 *        Thursday, May 22, 2008
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_create(const H5D_t *dset /*in,out*/)
{
    H5D_chk_idx_info_t   idx_info; /* Chunked index info */
    H5O_storage_chunk_t *sc        = &(dset->shared->layout.storage.u.chunk);
    herr_t               ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Check args */
    HDassert(dset);
    HDassert(H5D_CHUNKED == dset->shared->layout.type);
    HDassert(dset->shared->layout.u.chunk.ndims > 0 &&
             dset->shared->layout.u.chunk.ndims <= H5O_LAYOUT_NDIMS);
    H5D_CHUNK_STORAGE_INDEX_CHK(sc);

#ifndef NDEBUG
    {
        unsigned u; /* Local index variable */

        for (u = 0; u < dset->shared->layout.u.chunk.ndims; u++)
            HDassert(dset->shared->layout.u.chunk.dim[u] > 0);
    }
#endif

    /* Compose chunked index info struct */
    idx_info.f       = dset->oloc.file;
    idx_info.pline   = &dset->shared->dcpl_cache.pline;
    idx_info.layout  = &dset->shared->layout.u.chunk;
    idx_info.storage = sc;

    /* Create the index for the chunks */
    if ((sc->ops->create)(&idx_info) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't create chunk index")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_create() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_hash_val
 *
 * Purpose:     To calculate an index based on the dataset's scaled
 *              coordinates and sizes of the faster dimensions.
 *
 * Return:    Hash value index
 *
 * Programmer:    Vailin Choi; Nov 2014
 *
 *-------------------------------------------------------------------------
 */
static unsigned
H5D__chunk_hash_val(const H5D_shared_t *shared, const hsize_t *scaled)
{
    hsize_t  val;                   /* Intermediate value */
    unsigned ndims = shared->ndims; /* Rank of dataset */
    unsigned ret   = 0;             /* Value to return */
    unsigned u;                     /* Local index variable */

    FUNC_ENTER_PACKAGE_NOERR

    /* Sanity check */
    HDassert(shared);
    HDassert(scaled);

    /* If the fastest changing dimension doesn't have enough entropy, use
     *  other dimensions too
     */
    val = scaled[0];
    for (u = 1; u < ndims; u++) {
        val <<= shared->cache.chunk.scaled_encode_bits[u];
        val ^= scaled[u];
    } /* end for */

    /* Modulo value against the number of array slots */
    ret = (unsigned)(val % shared->cache.chunk.nslots);

    FUNC_LEAVE_NOAPI(ret)
} /* H5D__chunk_hash_val() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_lookup
 *
 * Purpose:    Loops up a chunk in cache and on disk, and retrieves
 *              information about that chunk.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Albert Cheng
 *              June 27, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_lookup(const H5D_t *dset, const hsize_t *scaled, H5D_chunk_ud_t *udata)
{
    H5D_rdcc_ent_t *     ent   = NULL; /* Cache entry */
    H5O_storage_chunk_t *sc    = &(dset->shared->layout.storage.u.chunk);
    unsigned             idx   = 0;     /* Index of chunk in cache, if present */
    hbool_t              found = FALSE; /* In cache? */
#ifdef H5_HAVE_PARALLEL
    H5P_coll_md_read_flag_t md_reads_file_flag;
    hbool_t                 md_reads_context_flag;
    hbool_t                 restore_md_reads_state = FALSE;
#endif
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(dset);
    HDassert(dset->shared->layout.u.chunk.ndims > 0);
    H5D_CHUNK_STORAGE_INDEX_CHK(sc);
    HDassert(scaled);
    HDassert(udata);

    /* Initialize the query information about the chunk we are looking for */
    udata->common.layout  = &(dset->shared->layout.u.chunk);
    udata->common.storage = sc;
    udata->common.scaled  = scaled;

    /* Reset information about the chunk we are looking for */
    udata->chunk_block.offset = HADDR_UNDEF;
    udata->chunk_block.length = 0;
    udata->filter_mask        = 0;
    udata->new_unfilt_chunk   = FALSE;

    /* Check for chunk in cache */
    if (dset->shared->cache.chunk.nslots > 0) {
        /* Determine the chunk's location in the hash table */
        idx = H5D__chunk_hash_val(dset->shared, scaled);

        /* Get the chunk cache entry for that location */
        ent = dset->shared->cache.chunk.slot[idx];
        if (ent) {
            unsigned u; /* Counter */

            /* Speculatively set the 'found' flag */
            found = TRUE;

            /* Verify that the cache entry is the correct chunk */
            for (u = 0; u < dset->shared->ndims; u++)
                if (scaled[u] != ent->scaled[u]) {
                    found = FALSE;
                    break;
                } /* end if */
        }         /* end if */
    }             /* end if */

    /* Retrieve chunk addr */
    if (found) {
        udata->idx_hint           = idx;
        udata->chunk_block.offset = ent->chunk_block.offset;
        udata->chunk_block.length = ent->chunk_block.length;
        ;
        udata->chunk_idx = ent->chunk_idx;
    } /* end if */
    else {
        /* Invalidate idx_hint, to signal that the chunk is not in cache */
        udata->idx_hint = UINT_MAX;

        /* Check for cached information */
        if (!H5D__chunk_cinfo_cache_found(&dset->shared->cache.chunk.last, udata)) {
            H5D_chk_idx_info_t idx_info; /* Chunked index info */

            /* Compose chunked index info struct */
            idx_info.f       = dset->oloc.file;
            idx_info.pline   = &dset->shared->dcpl_cache.pline;
            idx_info.layout  = &dset->shared->layout.u.chunk;
            idx_info.storage = sc;

#ifdef H5_HAVE_PARALLEL
            /* Disable collective metadata read for chunk indexes as it is
             * highly unlikely that users would read the same chunks from all
             * processes.
             */
            if (H5F_HAS_FEATURE(idx_info.f, H5FD_FEAT_HAS_MPI)) {
                md_reads_file_flag    = H5P_FORCE_FALSE;
                md_reads_context_flag = FALSE;
                H5F_set_coll_metadata_reads(idx_info.f, &md_reads_file_flag, &md_reads_context_flag);
                restore_md_reads_state = TRUE;
            }
#endif /* H5_HAVE_PARALLEL */

            /* Go get the chunk information */
            if ((sc->ops->get_addr)(&idx_info, udata) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't query chunk address")

                /*
                 * Cache the information retrieved.
                 *
                 * Note that if we are writing to the dataset in parallel and filters
                 * are involved, we skip caching this information as it is highly likely
                 * that the chunk information will be invalidated as a result of the
                 * filter operation (e.g. the chunk gets re-allocated to a different
                 * address in the file and/or gets re-allocated with a different size).
                 * If we were to cache this information, subsequent reads/writes would
                 * retrieve the invalid information and cause a variety of issues.
                 *
                 * It has been verified that in the serial library, when writing to chunks
                 * with the real chunk cache disabled and with filters involved, the
                 * functions within this file are correctly called in such a manner that
                 * this single chunk cache is always updated correctly. Therefore, this
                 * check is not needed for the serial library.
                 *
                 * This is an ugly and potentially frail check, but the
                 * H5D__chunk_cinfo_cache_reset() function is not currently available
                 * to functions outside of this file, so outside functions can not
                 * invalidate this single chunk cache. Even if the function were available,
                 * this check prevents us from doing the work of going through and caching
                 * each chunk in the write operation, when we're only going to invalidate
                 * the cache at the end of a parallel write anyway.
                 *
                 *  - JTH (7/13/2018)
                 */
#ifdef H5_HAVE_PARALLEL
            if (!((H5F_HAS_FEATURE(idx_info.f, H5FD_FEAT_HAS_MPI)) &&
                  (H5F_INTENT(dset->oloc.file) & H5F_ACC_RDWR) && dset->shared->dcpl_cache.pline.nused))
#endif
                H5D__chunk_cinfo_cache_update(&dset->shared->cache.chunk.last, udata);
        } /* end if */
    }     /* end else */

done:
#ifdef H5_HAVE_PARALLEL
    /* Re-enable collective metadata reads if we disabled them */
    if (restore_md_reads_state)
        H5F_set_coll_metadata_reads(dset->oloc.file, &md_reads_file_flag, &md_reads_context_flag);
#endif /* H5_HAVE_PARALLEL */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D__chunk_lookup() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_flush_entry
 *
 * Purpose:    Writes a chunk to disk.  If RESET is non-zero then the
 *        entry is cleared -- it's slightly faster to flush a chunk if
 *        the RESET flag is turned on because it results in one fewer
 *        memory copy.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *              Thursday, May 21, 1998
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_flush_entry(const H5D_t *dset, H5D_rdcc_ent_t *ent, hbool_t reset)
{
    void *               buf                = NULL; /* Temporary buffer        */
    hbool_t              point_of_no_return = FALSE;
    H5O_storage_chunk_t *sc                 = &(dset->shared->layout.storage.u.chunk);
    herr_t               ret_value          = SUCCEED; /* Return value            */

    FUNC_ENTER_PACKAGE

    HDassert(dset);
    HDassert(dset->shared);
    H5D_CHUNK_STORAGE_INDEX_CHK(sc);
    HDassert(ent);
    HDassert(!ent->locked);

    buf = ent->chunk;
    if (ent->dirty) {
        H5D_chk_idx_info_t idx_info;            /* Chunked index info */
        H5D_chunk_ud_t     udata;               /* pass through B-tree        */
        hbool_t            must_alloc  = FALSE; /* Whether the chunk must be allocated */
        hbool_t            need_insert = FALSE; /* Whether the chunk needs to be inserted into the index */

        /* Set up user data for index callbacks */
        udata.common.layout      = &dset->shared->layout.u.chunk;
        udata.common.storage     = sc;
        udata.common.scaled      = ent->scaled;
        udata.chunk_block.offset = ent->chunk_block.offset;
        udata.chunk_block.length = dset->shared->layout.u.chunk.size;
        udata.filter_mask        = 0;
        udata.chunk_idx          = ent->chunk_idx;

        /* Should the chunk be filtered before writing it to disk? */
        if (dset->shared->dcpl_cache.pline.nused && !(ent->edge_chunk_state & H5D_RDCC_DISABLE_FILTERS)) {
            H5Z_EDC_t err_detect;                       /* Error detection info */
            H5Z_cb_t  filter_cb;                        /* I/O filter callback function */
            size_t    alloc = udata.chunk_block.length; /* Bytes allocated for BUF    */
            size_t    nbytes;                           /* Chunk size (in bytes) */

            /* Retrieve filter settings from API context */
            if (H5CX_get_err_detect(&err_detect) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get error detection info")
            if (H5CX_get_filter_cb(&filter_cb) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get I/O filter callback function")

            if (!reset) {
                /*
                 * Copy the chunk to a new buffer before running it through
                 * the pipeline because we'll want to save the original buffer
                 * for later.
                 */
                if (NULL == (buf = H5MM_malloc(alloc)))
                    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for pipeline")
                H5MM_memcpy(buf, ent->chunk, alloc);
            } /* end if */
            else {
                /*
                 * If we are resetting and something goes wrong after this
                 * point then it's too late to recover because we may have
                 * destroyed the original data by calling H5Z_pipeline().
                 * The only safe option is to continue with the reset
                 * even if we can't write the data to disk.
                 */
                point_of_no_return = TRUE;
                ent->chunk         = NULL;
            } /* end else */
            H5_CHECKED_ASSIGN(nbytes, size_t, udata.chunk_block.length, hsize_t);
            if (H5Z_pipeline(&(dset->shared->dcpl_cache.pline), 0, &(udata.filter_mask), err_detect,
                             filter_cb, &nbytes, &alloc, &buf) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTFILTER, FAIL, "output pipeline failed")
#if H5_SIZEOF_SIZE_T > 4
            /* Check for the chunk expanding too much to encode in a 32-bit value */
            if (nbytes > ((size_t)0xffffffff))
                HGOTO_ERROR(H5E_DATASET, H5E_BADRANGE, FAIL, "chunk too large for 32-bit length")
#endif /* H5_SIZEOF_SIZE_T > 4 */
            H5_CHECKED_ASSIGN(udata.chunk_block.length, hsize_t, nbytes, size_t);

            /* Indicate that the chunk must be allocated */
            must_alloc = TRUE;
        } /* end if */
        else if (!H5F_addr_defined(udata.chunk_block.offset)) {
            /* Indicate that the chunk must be allocated */
            must_alloc = TRUE;

            /* This flag could be set for this chunk, just remove and ignore it
             */
            ent->edge_chunk_state &= ~H5D_RDCC_NEWLY_DISABLED_FILTERS;
        } /* end else */
        else if (ent->edge_chunk_state & H5D_RDCC_NEWLY_DISABLED_FILTERS) {
            /* Chunk on disk is still filtered, must insert to allocate correct
             * size */
            must_alloc = TRUE;

            /* Set the disable filters field back to the standard disable
             * filters setting, as it no longer needs to be inserted with every
             * flush */
            ent->edge_chunk_state &= ~H5D_RDCC_NEWLY_DISABLED_FILTERS;
        } /* end else */

        HDassert(!(ent->edge_chunk_state & H5D_RDCC_NEWLY_DISABLED_FILTERS));

        /* Check if the chunk needs to be allocated (it also could exist already
         *      and the chunk alloc operation could resize it)
         */
        if (must_alloc) {
            /* Compose chunked index info struct */
            idx_info.f       = dset->oloc.file;
            idx_info.pline   = &dset->shared->dcpl_cache.pline;
            idx_info.layout  = &dset->shared->layout.u.chunk;
            idx_info.storage = sc;

            /* Create the chunk it if it doesn't exist, or reallocate the chunk
             *  if its size changed.
             */
            if (H5D__chunk_file_alloc(&idx_info, &(ent->chunk_block), &udata.chunk_block, &need_insert,
                                      ent->scaled) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTINSERT, FAIL, "unable to insert/resize chunk on chunk level")

            /* Update the chunk entry's info, in case it was allocated or relocated */
            ent->chunk_block.offset = udata.chunk_block.offset;
            ent->chunk_block.length = udata.chunk_block.length;
        } /* end if */

        /* Write the data to the file */
        HDassert(H5F_addr_defined(udata.chunk_block.offset));
        H5_CHECK_OVERFLOW(udata.chunk_block.length, hsize_t, size_t);
        if (H5F_shared_block_write(H5F_SHARED(dset->oloc.file), H5FD_MEM_DRAW, udata.chunk_block.offset,
                                   (size_t)udata.chunk_block.length, buf) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_WRITEERROR, FAIL, "unable to write raw data to file")

        /* Insert the chunk record into the index */
        if (need_insert && sc->ops->insert)
            if ((sc->ops->insert)(&idx_info, &udata, dset) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTINSERT, FAIL, "unable to insert chunk addr into index")

        /* Cache the chunk's info, in case it's accessed again shortly */
        H5D__chunk_cinfo_cache_update(&dset->shared->cache.chunk.last, &udata);

        /* Mark cache entry as clean */
        ent->dirty = FALSE;

        /* Increment # of flushed entries */
        dset->shared->cache.chunk.stats.nflushes++;
    } /* end if */

    /* Reset, but do not free or removed from list */
    if (reset) {
        point_of_no_return = FALSE;
        if (buf == ent->chunk)
            buf = NULL;
        if (ent->chunk != NULL)
            ent->chunk = (uint8_t *)H5D__chunk_mem_xfree(ent->chunk,
                                                         ((ent->edge_chunk_state & H5D_RDCC_DISABLE_FILTERS)
                                                              ? NULL
                                                              : &(dset->shared->dcpl_cache.pline)));
    } /* end if */

done:
    /* Free the temp buffer only if it's different than the entry chunk */
    if (buf != ent->chunk)
        H5MM_xfree(buf);

    /*
     * If we reached the point of no return then we have no choice but to
     * reset the entry.  This can only happen if RESET is true but the
     * output pipeline failed.  Do not free the entry or remove it from the
     * list.
     */
    if (ret_value < 0 && point_of_no_return)
        if (ent->chunk)
            ent->chunk = (uint8_t *)H5D__chunk_mem_xfree(ent->chunk,
                                                         ((ent->edge_chunk_state & H5D_RDCC_DISABLE_FILTERS)
                                                              ? NULL
                                                              : &(dset->shared->dcpl_cache.pline)));

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_flush_entry() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_cache_evict
 *
 * Purpose:     Preempts the specified entry from the cache, flushing it to
 *              disk if necessary.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Robb Matzke
 *              Thursday, May 21, 1998
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_cache_evict(const H5D_t *dset, H5D_rdcc_ent_t *ent, hbool_t flush)
{
    H5D_rdcc_t *rdcc      = &(dset->shared->cache.chunk);
    herr_t      ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(dset);
    HDassert(ent);
    HDassert(!ent->locked);
    HDassert(ent->idx < rdcc->nslots);

    if (flush) {
        /* Flush */
        if (H5D__chunk_flush_entry(dset, ent, TRUE) < 0)
            HDONE_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "cannot flush indexed storage buffer")
    } /* end if */
    else {
        /* Don't flush, just free chunk */
        if (ent->chunk != NULL)
            ent->chunk = (uint8_t *)H5D__chunk_mem_xfree(ent->chunk,
                                                         ((ent->edge_chunk_state & H5D_RDCC_DISABLE_FILTERS)
                                                              ? NULL
                                                              : &(dset->shared->dcpl_cache.pline)));
    } /* end else */

    /* Unlink from list */
    if (ent->prev)
        ent->prev->next = ent->next;
    else
        rdcc->head = ent->next;
    if (ent->next)
        ent->next->prev = ent->prev;
    else
        rdcc->tail = ent->prev;
    ent->prev = ent->next = NULL;

    /* Unlink from temporary list */
    if (ent->tmp_prev) {
        HDassert(rdcc->tmp_head->tmp_next);
        ent->tmp_prev->tmp_next = ent->tmp_next;
        if (ent->tmp_next) {
            ent->tmp_next->tmp_prev = ent->tmp_prev;
            ent->tmp_next           = NULL;
        } /* end if */
        ent->tmp_prev = NULL;
    } /* end if */
    else
        /* Only clear hash table slot if the chunk was not on the temporary list
         */
        rdcc->slot[ent->idx] = NULL;

    /* Remove from cache */
    HDassert(rdcc->slot[ent->idx] != ent);
    ent->idx = UINT_MAX;
    rdcc->nbytes_used -= dset->shared->layout.u.chunk.size;
    --rdcc->nused;

    /* Free */
    ent = H5FL_FREE(H5D_rdcc_ent_t, ent);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_cache_evict() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_cache_prune
 *
 * Purpose:    Prune the cache by preempting some things until the cache has
 *        room for something which is SIZE bytes.  Only unlocked
 *        entries are considered for preemption.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *              Thursday, May 21, 1998
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_cache_prune(const H5D_t *dset, size_t size)
{
    const H5D_rdcc_t *rdcc  = &(dset->shared->cache.chunk);
    size_t            total = rdcc->nbytes_max;
    const int         nmeth = 2;           /* Number of methods */
    int               w[1];                /* Weighting as an interval */
    H5D_rdcc_ent_t *  p[2], *cur;          /* List pointers */
    H5D_rdcc_ent_t *  n[2];                /* List next pointers */
    int               nerrors   = 0;       /* Accumulated error count during preemptions */
    herr_t            ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /*
     * Preemption is accomplished by having multiple pointers (currently two)
     * slide down the list beginning at the head. Pointer p(N+1) will start
     * traversing the list when pointer pN reaches wN percent of the original
     * list.  In other words, preemption method N gets to consider entries in
     * approximate least recently used order w0 percent before method N+1
     * where 100% means the method N will run to completion before method N+1
     * begins.  The pointers participating in the list traversal are each
     * given a chance at preemption before any of the pointers are advanced.
     */
    w[0] = (int)(rdcc->nused * rdcc->w0);
    p[0] = rdcc->head;
    p[1] = NULL;

    while ((p[0] || p[1]) && (rdcc->nbytes_used + size) > total) {
        int i; /* Local index variable */

        /* Introduce new pointers */
        for (i = 0; i < nmeth - 1; i++)
            if (0 == w[i])
                p[i + 1] = rdcc->head;

        /* Compute next value for each pointer */
        for (i = 0; i < nmeth; i++)
            n[i] = p[i] ? p[i]->next : NULL;

        /* Give each method a chance */
        for (i = 0; i < nmeth && (rdcc->nbytes_used + size) > total; i++) {
            if (0 == i && p[0] && !p[0]->locked &&
                ((0 == p[0]->rd_count && 0 == p[0]->wr_count) ||
                 (0 == p[0]->rd_count && dset->shared->layout.u.chunk.size == p[0]->wr_count) ||
                 (dset->shared->layout.u.chunk.size == p[0]->rd_count && 0 == p[0]->wr_count))) {
                /*
                 * Method 0: Preempt entries that have been completely written
                 * and/or completely read but not entries that are partially
                 * written or partially read.
                 */
                cur = p[0];
            }
            else if (1 == i && p[1] && !p[1]->locked) {
                /*
                 * Method 1: Preempt the entry without regard to
                 * considerations other than being locked.  This is the last
                 * resort preemption.
                 */
                cur = p[1];
            }
            else {
                /* Nothing to preempt at this point */
                cur = NULL;
            }

            if (cur) {
                int j; /* Local index variable */

                for (j = 0; j < nmeth; j++) {
                    if (p[j] == cur)
                        p[j] = NULL;
                    if (n[j] == cur)
                        n[j] = cur->next;
                } /* end for */
                if (H5D__chunk_cache_evict(dset, cur, TRUE) < 0)
                    nerrors++;
            } /* end if */
        }     /* end for */

        /* Advance pointers */
        for (i = 0; i < nmeth; i++)
            p[i] = n[i];
        for (i = 0; i < nmeth - 1; i++)
            w[i] -= 1;
    } /* end while */

    if (nerrors)
        HGOTO_ERROR(H5E_IO, H5E_CANTFLUSH, FAIL, "unable to preempt one or more raw data cache entry")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_cache_prune() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_lock
 *
 * Purpose:    Return a pointer to a dataset chunk.  The pointer points
 *        directly into the chunk cache and should not be freed
 *        by the caller but will be valid until it is unlocked.  The
 *        input value IDX_HINT is used to speed up cache lookups and
 *        it's output value should be given to H5D__chunk_unlock().
 *        IDX_HINT is ignored if it is out of range, and if it points
 *        to the wrong entry then we fall back to the normal search
 *        method.
 *
 *        If RELAX is non-zero and the chunk isn't in the cache then
 *        don't try to read it from the file, but just allocate an
 *        uninitialized buffer to hold the result.  This is intended
 *        for output functions that are about to overwrite the entire
 *        chunk.
 *
 * Return:    Success:    Ptr to a file chunk.
 *
 *        Failure:    NULL
 *
 * Programmer:    Robb Matzke
 *              Thursday, May 21, 1998
 *
 *-------------------------------------------------------------------------
 */
static void *
H5D__chunk_lock(const H5D_io_info_t *io_info, H5D_chunk_ud_t *udata, hbool_t relax, hbool_t prev_unfilt_chunk)
{
    const H5D_t *dset = io_info->dset; /* Local pointer to the dataset info */
    H5O_pline_t *pline =
        &(dset->shared->dcpl_cache
              .pline); /* I/O pipeline info - always equal to the pline passed to H5D__chunk_mem_alloc */
    H5O_pline_t *       old_pline = pline; /* Old pipeline, i.e. pipeline used to read the chunk */
    const H5O_layout_t *layout    = &(dset->shared->layout);          /* Dataset layout */
    const H5O_fill_t *  fill      = &(dset->shared->dcpl_cache.fill); /* Fill value info */
    H5D_fill_buf_info_t fb_info;                                      /* Dataset's fill buffer info */
    hbool_t             fb_info_init = FALSE; /* Whether the fill value buffer has been initialized */
    H5D_rdcc_t *        rdcc         = &(dset->shared->cache.chunk); /*raw data chunk cache*/
    H5D_rdcc_ent_t *    ent;                                         /*cache entry        */
    size_t              chunk_size;                                  /*size of a chunk    */
    hbool_t             disable_filters = FALSE; /* Whether to disable filters (when adding to cache) */
    void *              chunk           = NULL;  /*the file chunk    */
    void *              ret_value       = NULL;  /* Return value         */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(io_info);
    HDassert(io_info->store);
    HDassert(udata);
    HDassert(dset);
    HDassert(!(udata->new_unfilt_chunk && prev_unfilt_chunk));
    HDassert(!rdcc->tmp_head);

    /* Get the chunk's size */
    HDassert(layout->u.chunk.size > 0);
    H5_CHECKED_ASSIGN(chunk_size, size_t, layout->u.chunk.size, uint32_t);

    /* Check if the chunk is in the cache */
    if (UINT_MAX != udata->idx_hint) {
        /* Sanity check */
        HDassert(udata->idx_hint < rdcc->nslots);
        HDassert(rdcc->slot[udata->idx_hint]);

        /* Get the entry */
        ent = rdcc->slot[udata->idx_hint];

#ifndef NDEBUG
        {
            unsigned u; /*counters        */

            /* Make sure this is the right chunk */
            for (u = 0; u < layout->u.chunk.ndims - 1; u++)
                HDassert(io_info->store->chunk.scaled[u] == ent->scaled[u]);
        }
#endif /* NDEBUG */

        /*
         * Already in the cache.  Count a hit.
         */
        rdcc->stats.nhits++;

        /* Make adjustments if the edge chunk status changed recently */
        if (pline->nused) {
            /* If the chunk recently became an unfiltered partial edge chunk
             * while in cache, we must make some changes to the entry */
            if (udata->new_unfilt_chunk) {
                /* If this flag is set then partial chunk filters must be
                 * disabled, and the chunk must not have previously been a
                 * partial chunk (with disabled filters) */
                HDassert(layout->u.chunk.flags & H5O_LAYOUT_CHUNK_DONT_FILTER_PARTIAL_BOUND_CHUNKS);
                HDassert(!(ent->edge_chunk_state & H5D_RDCC_DISABLE_FILTERS));
                HDassert(old_pline->nused);

                /* Disable filters.  Set pline to NULL instead of just the
                 * default pipeline to make a quick failure more likely if the
                 * code is changed in an inappropriate/incomplete way. */
                pline = NULL;

                /* Reallocate the chunk so H5D__chunk_mem_xfree doesn't get confused
                 */
                if (NULL == (chunk = H5D__chunk_mem_alloc(chunk_size, pline)))
                    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL,
                                "memory allocation failed for raw data chunk")
                H5MM_memcpy(chunk, ent->chunk, chunk_size);
                ent->chunk = (uint8_t *)H5D__chunk_mem_xfree(ent->chunk, old_pline);
                ent->chunk = (uint8_t *)chunk;
                chunk      = NULL;

                /* Mark the chunk as having filters disabled as well as "newly
                 * disabled" so it is inserted on flush */
                ent->edge_chunk_state |= H5D_RDCC_DISABLE_FILTERS;
                ent->edge_chunk_state |= H5D_RDCC_NEWLY_DISABLED_FILTERS;
            } /* end if */
            else if (prev_unfilt_chunk) {
                /* If this flag is set then partial chunk filters must be
                 * disabled, and the chunk must have previously been a partial
                 * chunk (with disabled filters) */
                HDassert(layout->u.chunk.flags & H5O_LAYOUT_CHUNK_DONT_FILTER_PARTIAL_BOUND_CHUNKS);
                HDassert((ent->edge_chunk_state & H5D_RDCC_DISABLE_FILTERS));
                HDassert(pline->nused);

                /* Mark the old pipeline as having been disabled */
                old_pline = NULL;

                /* Reallocate the chunk so H5D__chunk_mem_xfree doesn't get confused
                 */
                if (NULL == (chunk = H5D__chunk_mem_alloc(chunk_size, pline)))
                    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL,
                                "memory allocation failed for raw data chunk")
                H5MM_memcpy(chunk, ent->chunk, chunk_size);

                ent->chunk = (uint8_t *)H5D__chunk_mem_xfree(ent->chunk, old_pline);
                ent->chunk = (uint8_t *)chunk;
                chunk      = NULL;

                /* Mark the chunk as having filters enabled */
                ent->edge_chunk_state &= ~(H5D_RDCC_DISABLE_FILTERS | H5D_RDCC_NEWLY_DISABLED_FILTERS);
            } /* end else */
        }     /* end if */

        /*
         * If the chunk is not at the beginning of the cache; move it backward
         * by one slot.  This is how we implement the LRU preemption
         * algorithm.
         */
        if (ent->next) {
            if (ent->next->next)
                ent->next->next->prev = ent;
            else
                rdcc->tail = ent;
            ent->next->prev = ent->prev;
            if (ent->prev)
                ent->prev->next = ent->next;
            else
                rdcc->head = ent->next;
            ent->prev       = ent->next;
            ent->next       = ent->next->next;
            ent->prev->next = ent;
        } /* end if */
    }     /* end if */
    else {
        haddr_t chunk_addr;  /* Address of chunk on disk */
        hsize_t chunk_alloc; /* Length of chunk on disk */

        /* Save the chunk info so the cache stays consistent */
        chunk_addr  = udata->chunk_block.offset;
        chunk_alloc = udata->chunk_block.length;

        /* Check if we should disable filters on this chunk */
        if (pline->nused) {
            if (udata->new_unfilt_chunk) {
                HDassert(layout->u.chunk.flags & H5O_LAYOUT_CHUNK_DONT_FILTER_PARTIAL_BOUND_CHUNKS);

                /* Disable the filters for writing */
                disable_filters = TRUE;
                pline           = NULL;
            } /* end if */
            else if (prev_unfilt_chunk) {
                HDassert(layout->u.chunk.flags & H5O_LAYOUT_CHUNK_DONT_FILTER_PARTIAL_BOUND_CHUNKS);

                /* Mark the filters as having been previously disabled (for the
                 * chunk as currently on disk) - disable the filters for reading
                 */
                old_pline = NULL;
            } /* end if */
            else if (layout->u.chunk.flags & H5O_LAYOUT_CHUNK_DONT_FILTER_PARTIAL_BOUND_CHUNKS) {
                /* Check if this is an edge chunk */
                if (H5D__chunk_is_partial_edge_chunk(io_info->dset->shared->ndims, layout->u.chunk.dim,
                                                     io_info->store->chunk.scaled,
                                                     io_info->dset->shared->curr_dims)) {
                    /* Disable the filters for both writing and reading */
                    disable_filters = TRUE;
                    old_pline       = NULL;
                    pline           = NULL;
                } /* end if */
            }     /* end if */
        }         /* end if */

        if (relax) {
            /*
             * Not in the cache, but we're about to overwrite the whole thing
             * anyway, so just allocate a buffer for it but don't initialize that
             * buffer with the file contents. Count this as a hit instead of a
             * miss because we saved ourselves lots of work.
             */
            rdcc->stats.nhits++;

            if (NULL == (chunk = H5D__chunk_mem_alloc(chunk_size, pline)))
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed for raw data chunk")

            /* In the case that some dataset functions look through this data,
             * clear it to all 0s. */
            HDmemset(chunk, 0, chunk_size);
        } /* end if */
        else {
            /*
             * Not in the cache.  Count this as a miss if it's in the file
             *      or an init if it isn't.
             */

            /* Check if the chunk exists on disk */
            if (H5F_addr_defined(chunk_addr)) {
                size_t my_chunk_alloc = chunk_alloc; /* Allocated buffer size */
                size_t buf_alloc      = chunk_alloc; /* [Re-]allocated buffer size */

                /* Chunk size on disk isn't [likely] the same size as the final chunk
                 * size in memory, so allocate memory big enough. */
                if (NULL == (chunk = H5D__chunk_mem_alloc(my_chunk_alloc,
                                                          (udata->new_unfilt_chunk ? old_pline : pline))))
                    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL,
                                "memory allocation failed for raw data chunk")
                if (H5F_shared_block_read(H5F_SHARED(dset->oloc.file), H5FD_MEM_DRAW, chunk_addr,
                                          my_chunk_alloc, chunk) < 0)
                    HGOTO_ERROR(H5E_IO, H5E_READERROR, NULL, "unable to read raw data chunk")

                if (old_pline && old_pline->nused) {
                    H5Z_EDC_t err_detect; /* Error detection info */
                    H5Z_cb_t  filter_cb;  /* I/O filter callback function */

                    /* Retrieve filter settings from API context */
                    if (H5CX_get_err_detect(&err_detect) < 0)
                        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, NULL, "can't get error detection info")
                    if (H5CX_get_filter_cb(&filter_cb) < 0)
                        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, NULL, "can't get I/O filter callback function")

                    if (H5Z_pipeline(old_pline, H5Z_FLAG_REVERSE, &(udata->filter_mask), err_detect,
                                     filter_cb, &my_chunk_alloc, &buf_alloc, &chunk) < 0)
                        HGOTO_ERROR(H5E_DATASET, H5E_CANTFILTER, NULL, "data pipeline read failed")

                    /* Reallocate chunk if necessary */
                    if (udata->new_unfilt_chunk) {
                        void *tmp_chunk = chunk;

                        if (NULL == (chunk = H5D__chunk_mem_alloc(my_chunk_alloc, pline))) {
                            (void)H5D__chunk_mem_xfree(tmp_chunk, old_pline);
                            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL,
                                        "memory allocation failed for raw data chunk")
                        } /* end if */
                        H5MM_memcpy(chunk, tmp_chunk, chunk_size);
                        (void)H5D__chunk_mem_xfree(tmp_chunk, old_pline);
                    } /* end if */
                }     /* end if */

                /* Increment # of cache misses */
                rdcc->stats.nmisses++;
            } /* end if */
            else {
                H5D_fill_value_t fill_status;

                /* Sanity check */
                HDassert(fill->alloc_time != H5D_ALLOC_TIME_EARLY);

                /* Chunk size on disk isn't [likely] the same size as the final chunk
                 * size in memory, so allocate memory big enough. */
                if (NULL == (chunk = H5D__chunk_mem_alloc(chunk_size, pline)))
                    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL,
                                "memory allocation failed for raw data chunk")

                if (H5P_is_fill_value_defined(fill, &fill_status) < 0)
                    HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't tell if fill value defined")

                if (fill->fill_time == H5D_FILL_TIME_ALLOC ||
                    (fill->fill_time == H5D_FILL_TIME_IFSET &&
                     (fill_status == H5D_FILL_VALUE_USER_DEFINED || fill_status == H5D_FILL_VALUE_DEFAULT))) {
                    /*
                     * The chunk doesn't exist in the file.  Replicate the fill
                     * value throughout the chunk, if the fill value is defined.
                     */

                    /* Initialize the fill value buffer */
                    /* (use the compact dataset storage buffer as the fill value buffer) */
                    if (H5D__fill_init(&fb_info, chunk, NULL, NULL, NULL, NULL,
                                       &dset->shared->dcpl_cache.fill, dset->shared->type,
                                       dset->shared->type_id, (size_t)0, chunk_size) < 0)
                        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "can't initialize fill buffer info")
                    fb_info_init = TRUE;

                    /* Check for VL datatype & non-default fill value */
                    if (fb_info.has_vlen_fill_type)
                        /* Fill the buffer with VL datatype fill values */
                        if (H5D__fill_refill_vl(&fb_info, fb_info.elmts_per_buf) < 0)
                            HGOTO_ERROR(H5E_DATASET, H5E_CANTCONVERT, NULL, "can't refill fill value buffer")
                } /* end if */
                else
                    HDmemset(chunk, 0, chunk_size);

                /* Increment # of creations */
                rdcc->stats.ninits++;
            } /* end else */
        }     /* end else */

        /* See if the chunk can be cached */
        if (rdcc->nslots > 0 && chunk_size <= rdcc->nbytes_max) {
            /* Calculate the index */
            udata->idx_hint = H5D__chunk_hash_val(io_info->dset->shared, udata->common.scaled);

            /* Add the chunk to the cache only if the slot is not already locked */
            ent = rdcc->slot[udata->idx_hint];
            if (!ent || !ent->locked) {
                /* Preempt enough things from the cache to make room */
                if (ent) {
                    if (H5D__chunk_cache_evict(io_info->dset, ent, TRUE) < 0)
                        HGOTO_ERROR(H5E_IO, H5E_CANTINIT, NULL, "unable to preempt chunk from cache")
                } /* end if */
                if (H5D__chunk_cache_prune(io_info->dset, chunk_size) < 0)
                    HGOTO_ERROR(H5E_IO, H5E_CANTINIT, NULL, "unable to preempt chunk(s) from cache")

                /* Create a new entry */
                if (NULL == (ent = H5FL_CALLOC(H5D_rdcc_ent_t)))
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, NULL, "can't allocate raw data chunk entry")

                ent->edge_chunk_state = disable_filters ? H5D_RDCC_DISABLE_FILTERS : 0;
                if (udata->new_unfilt_chunk)
                    ent->edge_chunk_state |= H5D_RDCC_NEWLY_DISABLED_FILTERS;

                /* Initialize the new entry */
                ent->chunk_block.offset = chunk_addr;
                ent->chunk_block.length = chunk_alloc;
                ent->chunk_idx          = udata->chunk_idx;
                H5MM_memcpy(ent->scaled, udata->common.scaled, sizeof(hsize_t) * layout->u.chunk.ndims);
                H5_CHECKED_ASSIGN(ent->rd_count, uint32_t, chunk_size, size_t);
                H5_CHECKED_ASSIGN(ent->wr_count, uint32_t, chunk_size, size_t);
                ent->chunk = (uint8_t *)chunk;

                /* Add it to the cache */
                HDassert(NULL == rdcc->slot[udata->idx_hint]);
                rdcc->slot[udata->idx_hint] = ent;
                ent->idx                    = udata->idx_hint;
                rdcc->nbytes_used += chunk_size;
                rdcc->nused++;

                /* Add it to the linked list */
                if (rdcc->tail) {
                    rdcc->tail->next = ent;
                    ent->prev        = rdcc->tail;
                    rdcc->tail       = ent;
                } /* end if */
                else
                    rdcc->head = rdcc->tail = ent;
                ent->tmp_next = NULL;
                ent->tmp_prev = NULL;

            } /* end if */
            else
                /* We did not add the chunk to cache */
                ent = NULL;
        }    /* end else */
        else /* No cache set up, or chunk is too large: chunk is uncacheable */
            ent = NULL;
    } /* end else */

    /* Lock the chunk into the cache */
    if (ent) {
        HDassert(!ent->locked);
        ent->locked = TRUE;
        chunk       = ent->chunk;
    } /* end if */
    else
        /*
         * The chunk cannot be placed in cache so we don't cache it. This is the
         * reason all those arguments have to be repeated for the unlock
         * function.
         */
        udata->idx_hint = UINT_MAX;

    /* Set return value */
    ret_value = chunk;

done:
    /* Release the fill buffer info, if it's been initialized */
    if (fb_info_init && H5D__fill_term(&fb_info) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CANTFREE, NULL, "Can't release fill buffer info")

    /* Release the chunk allocated, on error */
    if (!ret_value)
        if (chunk)
            chunk = H5D__chunk_mem_xfree(chunk, pline);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_lock() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_unlock
 *
 * Purpose:    Unlocks a previously locked chunk. The LAYOUT, COMP, and
 *        OFFSET arguments should be the same as for H5D__chunk_lock().
 *        The DIRTY argument should be set to non-zero if the chunk has
 *        been modified since it was locked. The IDX_HINT argument is
 *        the returned index hint from the lock operation and BUF is
 *        the return value from the lock.
 *
 *        The NACCESSED argument should be the number of bytes accessed
 *        for reading or writing (depending on the value of DIRTY).
 *        It's only purpose is to provide additional information to the
 *        preemption policy.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *              Thursday, May 21, 1998
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_unlock(const H5D_io_info_t *io_info, const H5D_chunk_ud_t *udata, hbool_t dirty, void *chunk,
                  uint32_t naccessed)
{
    const H5O_layout_t *layout    = &(io_info->dset->shared->layout); /* Dataset layout */
    const H5D_rdcc_t *  rdcc      = &(io_info->dset->shared->cache.chunk);
    herr_t              ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    HDassert(io_info);
    HDassert(udata);

    if (UINT_MAX == udata->idx_hint) {
        /*
         * It's not in the cache, probably because it's too big.  If it's
         * dirty then flush it to disk.  In any case, free the chunk.
         */
        hbool_t is_unfiltered_edge_chunk = FALSE; /* Whether the chunk is an unfiltered edge chunk */

        /* Check if we should disable filters on this chunk */
        if (udata->new_unfilt_chunk) {
            HDassert(layout->u.chunk.flags & H5O_LAYOUT_CHUNK_DONT_FILTER_PARTIAL_BOUND_CHUNKS);

            is_unfiltered_edge_chunk = TRUE;
        } /* end if */
        else if (layout->u.chunk.flags & H5O_LAYOUT_CHUNK_DONT_FILTER_PARTIAL_BOUND_CHUNKS) {
            /* Check if the chunk is an edge chunk, and disable filters if so */
            is_unfiltered_edge_chunk = H5D__chunk_is_partial_edge_chunk(
                io_info->dset->shared->ndims, layout->u.chunk.dim, io_info->store->chunk.scaled,
                io_info->dset->shared->curr_dims);
        } /* end if */

        if (dirty) {
            H5D_rdcc_ent_t fake_ent; /* "fake" chunk cache entry */

            HDmemset(&fake_ent, 0, sizeof(fake_ent));
            fake_ent.dirty = TRUE;
            if (is_unfiltered_edge_chunk)
                fake_ent.edge_chunk_state = H5D_RDCC_DISABLE_FILTERS;
            if (udata->new_unfilt_chunk)
                fake_ent.edge_chunk_state |= H5D_RDCC_NEWLY_DISABLED_FILTERS;
            H5MM_memcpy(fake_ent.scaled, udata->common.scaled, sizeof(hsize_t) * layout->u.chunk.ndims);
            HDassert(layout->u.chunk.size > 0);
            fake_ent.chunk_idx          = udata->chunk_idx;
            fake_ent.chunk_block.offset = udata->chunk_block.offset;
            fake_ent.chunk_block.length = udata->chunk_block.length;
            fake_ent.chunk              = (uint8_t *)chunk;

            if (H5D__chunk_flush_entry(io_info->dset, &fake_ent, TRUE) < 0)
                HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "cannot flush indexed storage buffer")
        } /* end if */
        else {
            if (chunk)
                chunk = H5D__chunk_mem_xfree(
                    chunk, (is_unfiltered_edge_chunk ? NULL : &(io_info->dset->shared->dcpl_cache.pline)));
        } /* end else */
    }     /* end if */
    else {
        H5D_rdcc_ent_t *ent; /* Chunk's entry in the cache */

        /* Sanity check */
        HDassert(udata->idx_hint < rdcc->nslots);
        HDassert(rdcc->slot[udata->idx_hint]);
        HDassert(rdcc->slot[udata->idx_hint]->chunk == chunk);

        /*
         * It's in the cache so unlock it.
         */
        ent = rdcc->slot[udata->idx_hint];
        HDassert(ent->locked);
        if (dirty) {
            ent->dirty = TRUE;
            ent->wr_count -= MIN(ent->wr_count, naccessed);
        } /* end if */
        else
            ent->rd_count -= MIN(ent->rd_count, naccessed);
        ent->locked = FALSE;
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_unlock() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_allocated_cb
 *
 * Purpose:    Simply counts the number of chunks for a dataset.
 *
 * Return:    Success:    Non-negative
 *        Failure:    Negative
 *
 * Programmer:    Robb Matzke
 *              Wednesday, April 21, 1999
 *
 *-------------------------------------------------------------------------
 */
static int
H5D__chunk_allocated_cb(const H5D_chunk_rec_t *chunk_rec, void *_udata)
{
    hsize_t *nbytes = (hsize_t *)_udata;

    FUNC_ENTER_PACKAGE_NOERR

    *(hsize_t *)nbytes += chunk_rec->nbytes;

    FUNC_LEAVE_NOAPI(H5_ITER_CONT)
} /* H5D__chunk_allocated_cb() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_allocated
 *
 * Purpose:    Return the number of bytes allocated in the file for storage
 *        of raw data in the chunked dataset
 *
 * Return:    Success:    Number of bytes stored in all chunks.
 *        Failure:    0
 *
 * Programmer:    Quincey Koziol
 *              Tuesday, May 20, 2008
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_allocated(const H5D_t *dset, hsize_t *nbytes)
{
    H5D_chk_idx_info_t   idx_info;                            /* Chunked index info */
    const H5D_rdcc_t *   rdcc = &(dset->shared->cache.chunk); /* Raw data chunk cache */
    H5D_rdcc_ent_t *     ent;                                 /* Cache entry  */
    hsize_t              chunk_bytes = 0;                     /* Number of bytes allocated for chunks */
    H5O_storage_chunk_t *sc          = &(dset->shared->layout.storage.u.chunk);
    herr_t               ret_value   = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    HDassert(dset);
    HDassert(dset->shared);
    H5D_CHUNK_STORAGE_INDEX_CHK(sc);

    /* Search for cached chunks that haven't been written out */
    for (ent = rdcc->head; ent; ent = ent->next)
        /* Flush the chunk out to disk, to make certain the size is correct later */
        if (H5D__chunk_flush_entry(dset, ent, FALSE) < 0)
            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "cannot flush indexed storage buffer")

    /* Compose chunked index info struct */
    idx_info.f       = dset->oloc.file;
    idx_info.pline   = &dset->shared->dcpl_cache.pline;
    idx_info.layout  = &dset->shared->layout.u.chunk;
    idx_info.storage = sc;

    /* Iterate over the chunks */
    if ((sc->ops->iterate)(&idx_info, H5D__chunk_allocated_cb, &chunk_bytes) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL,
                    "unable to retrieve allocated chunk information from index")

    /* Set number of bytes for caller */
    *nbytes = chunk_bytes;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_allocated() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_allocate
 *
 * Purpose:    Allocate file space for all chunks that are not allocated yet.
 *        Return SUCCEED if all needed allocation succeed, otherwise
 *        FAIL.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Albert Cheng
 *        June 26, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_allocate(const H5D_io_info_t *io_info, hbool_t full_overwrite, const hsize_t old_dim[])
{
    const H5D_t *          dset = io_info->dset;                           /* the dataset pointer */
    H5D_chk_idx_info_t     idx_info;                                       /* Chunked index info */
    const H5D_chunk_ops_t *ops = dset->shared->layout.storage.u.chunk.ops; /* Chunk operations */
    hsize_t min_unalloc[H5O_LAYOUT_NDIMS]; /* First chunk in each dimension that is unallocated (in scaled
                                              coordinates) */
    hsize_t max_unalloc[H5O_LAYOUT_NDIMS]; /* Last chunk in each dimension that is unallocated (in scaled
                                              coordinates) */
    hsize_t           scaled[H5O_LAYOUT_NDIMS]; /* Offset of current chunk (in scaled coordinates) */
    size_t            orig_chunk_size;          /* Original size of chunk in bytes */
    size_t            chunk_size;               /* Actual size of chunk in bytes, possibly filtered */
    unsigned          filter_mask = 0;          /* Filter mask for chunks that have them */
    H5O_layout_t *    layout      = &(dset->shared->layout);           /* Dataset layout */
    H5O_pline_t *     pline       = &(dset->shared->dcpl_cache.pline); /* I/O pipeline info */
    H5O_pline_t       def_pline   = H5O_CRT_PIPELINE_DEF;              /* Default pipeline */
    const H5O_fill_t *fill        = &(dset->shared->dcpl_cache.fill);  /* Fill value info */
    H5D_fill_value_t  fill_status;                                     /* The fill value status */
    hbool_t           should_fill     = FALSE; /* Whether fill values should be written */
    void *            unfilt_fill_buf = NULL;  /* Unfiltered fill value buffer */
    void **           fill_buf        = NULL;  /* Pointer to the fill buffer to use for a chunk */
#ifdef H5_HAVE_PARALLEL
    hbool_t blocks_written = FALSE; /* Flag to indicate that chunk was actually written */
    hbool_t using_mpi =
        FALSE; /* Flag to indicate that the file is being accessed with an MPI-capable file driver */
    H5D_chunk_coll_fill_info_t chunk_fill_info; /* chunk address information for doing I/O */
#endif                                          /* H5_HAVE_PARALLEL */
    hbool_t             carry; /* Flag to indicate that chunk increment carrys to higher dimension (sorta) */
    unsigned            space_ndims;                     /* Dataset's space rank */
    const hsize_t *     space_dim;                       /* Dataset's dataspace dimensions */
    const uint32_t *    chunk_dim = layout->u.chunk.dim; /* Convenience pointer to chunk dimensions */
    unsigned            op_dim;                          /* Current operating dimension */
    H5D_fill_buf_info_t fb_info;                         /* Dataset's fill buffer info */
    hbool_t             fb_info_init = FALSE; /* Whether the fill value buffer has been initialized */
    hbool_t has_unfilt_edge_chunks = FALSE; /* Whether there are partial edge chunks with disabled filters */
    hbool_t unfilt_edge_chunk_dim[H5O_LAYOUT_NDIMS]; /* Whether there are unfiltered edge chunks at the edge
                                                        of each dimension */
    hsize_t edge_chunk_scaled[H5O_LAYOUT_NDIMS]; /* Offset of the unfiltered edge chunks at the edge of each
                                                    dimension */
    unsigned             nunfilt_edge_chunk_dims = 0; /* Number of dimensions on an edge */
    H5O_storage_chunk_t *sc                      = &(layout->storage.u.chunk); /* Convenience variable */
    herr_t               ret_value               = SUCCEED;                    /* Return value */

    FUNC_ENTER_PACKAGE

    /* Check args */
    HDassert(dset && H5D_CHUNKED == layout->type);
    HDassert(layout->u.chunk.ndims > 0 && layout->u.chunk.ndims <= H5O_LAYOUT_NDIMS);
    H5D_CHUNK_STORAGE_INDEX_CHK(sc);

    /* Retrieve the dataset dimensions */
    space_dim   = dset->shared->curr_dims;
    space_ndims = dset->shared->ndims;

    /* The last dimension in scaled chunk coordinates is always 0 */
    scaled[space_ndims] = (hsize_t)0;

    /* Check if any space dimensions are 0, if so we do not have to do anything
     */
    for (op_dim = 0; op_dim < (unsigned)space_ndims; op_dim++)
        if (space_dim[op_dim] == 0) {
            /* Reset any cached chunk info for this dataset */
            H5D__chunk_cinfo_cache_reset(&dset->shared->cache.chunk.last);
            HGOTO_DONE(SUCCEED)
        } /* end if */

#ifdef H5_HAVE_PARALLEL
    /* Retrieve MPI parameters */
    if (H5F_HAS_FEATURE(dset->oloc.file, H5FD_FEAT_HAS_MPI)) {
        /* Set the MPI-capable file driver flag */
        using_mpi = TRUE;

        /* init chunk info stuff for collective I/O */
        chunk_fill_info.num_chunks = 0;
        chunk_fill_info.chunk_info = NULL;
    }  /* end if */
#endif /* H5_HAVE_PARALLEL */

    /* Calculate the minimum and maximum chunk offsets in each dimension, and
     * determine if there are any unfiltered partial edge chunks.  Note that we
     * assume here that all elements of space_dim are > 0.  This is checked at
     * the top of this function. */
    for (op_dim = 0; op_dim < space_ndims; op_dim++) {
        /* Validate this chunk dimension */
        if (chunk_dim[op_dim] == 0)
            HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "chunk size must be > 0, dim = %u ", op_dim)
        min_unalloc[op_dim] = (old_dim[op_dim] + chunk_dim[op_dim] - 1) / chunk_dim[op_dim];
        max_unalloc[op_dim] = (space_dim[op_dim] - 1) / chunk_dim[op_dim];

        /* Calculate if there are unfiltered edge chunks at the edge of this
         * dimension.  Note the edge_chunk_scaled is uninitialized for
         * dimensions where unfilt_edge_chunk_dim is FALSE.  Also  */
        if ((layout->u.chunk.flags & H5O_LAYOUT_CHUNK_DONT_FILTER_PARTIAL_BOUND_CHUNKS) && pline->nused > 0 &&
            space_dim[op_dim] % chunk_dim[op_dim] != 0) {
            has_unfilt_edge_chunks        = TRUE;
            unfilt_edge_chunk_dim[op_dim] = TRUE;
            edge_chunk_scaled[op_dim]     = max_unalloc[op_dim];
        } /* end if */
        else
            unfilt_edge_chunk_dim[op_dim] = FALSE;
    } /* end for */

    /* Get original chunk size */
    H5_CHECKED_ASSIGN(orig_chunk_size, size_t, layout->u.chunk.size, uint32_t);

    /* Check the dataset's fill-value status */
    if (H5P_is_fill_value_defined(fill, &fill_status) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't tell if fill value defined")

    /* If we are filling the dataset on allocation or "if set" and
     * the fill value _is_ set, _and_ we are not overwriting the new blocks,
     * or if there are any pipeline filters defined,
     * set the "should fill" flag
     */
    if ((!full_overwrite &&
         (fill->fill_time == H5D_FILL_TIME_ALLOC ||
          (fill->fill_time == H5D_FILL_TIME_IFSET &&
           (fill_status == H5D_FILL_VALUE_USER_DEFINED || fill_status == H5D_FILL_VALUE_DEFAULT)))) ||
        pline->nused > 0)
        should_fill = TRUE;

    /* Check if fill values should be written to chunks */
    if (should_fill) {
        /* Initialize the fill value buffer */
        /* (delay allocating fill buffer for VL datatypes until refilling) */
        if (H5D__fill_init(&fb_info, NULL, H5D__chunk_mem_alloc, pline, H5D__chunk_mem_free, pline,
                           &dset->shared->dcpl_cache.fill, dset->shared->type, dset->shared->type_id,
                           (size_t)0, orig_chunk_size) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't initialize fill buffer info")
        fb_info_init = TRUE;

        /* Initialize the fill_buf pointer to the buffer in fb_info.  If edge
         * chunk filters are disabled, we will switch the buffer as appropriate
         * for each chunk. */
        fill_buf = &fb_info.fill_buf;

        /* Check if there are filters which need to be applied to the chunk */
        /* (only do this in advance when the chunk info can be re-used (i.e.
         *      it doesn't contain any non-default VL datatype fill values)
         */
        if (!fb_info.has_vlen_fill_type && pline->nused > 0) {
            H5Z_EDC_t err_detect; /* Error detection info */
            H5Z_cb_t  filter_cb;  /* I/O filter callback function */
            size_t    buf_size = orig_chunk_size;

            /* If the dataset has disabled partial chunk filters, create a copy
             * of the unfiltered fill_buf to use for partial chunks */
            if (has_unfilt_edge_chunks) {
                if (NULL == (unfilt_fill_buf = H5D__chunk_mem_alloc(orig_chunk_size, &def_pline)))
                    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
                                "memory allocation failed for raw data chunk")
                H5MM_memcpy(unfilt_fill_buf, fb_info.fill_buf, orig_chunk_size);
            } /* end if */

            /* Retrieve filter settings from API context */
            if (H5CX_get_err_detect(&err_detect) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get error detection info")
            if (H5CX_get_filter_cb(&filter_cb) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get I/O filter callback function")

            /* Push the chunk through the filters */
            if (H5Z_pipeline(pline, 0, &filter_mask, err_detect, filter_cb, &orig_chunk_size, &buf_size,
                             &fb_info.fill_buf) < 0)
                HGOTO_ERROR(H5E_PLINE, H5E_WRITEERROR, FAIL, "output pipeline failed")
#if H5_SIZEOF_SIZE_T > 4
            /* Check for the chunk expanding too much to encode in a 32-bit value */
            if (orig_chunk_size > ((size_t)0xffffffff))
                HGOTO_ERROR(H5E_DATASET, H5E_BADRANGE, FAIL, "chunk too large for 32-bit length")
#endif    /* H5_SIZEOF_SIZE_T > 4 */
        } /* end if */
    }     /* end if */

    /* Compose chunked index info struct */
    idx_info.f       = dset->oloc.file;
    idx_info.pline   = &dset->shared->dcpl_cache.pline;
    idx_info.layout  = &dset->shared->layout.u.chunk;
    idx_info.storage = sc;

    /* Loop over all chunks */
    /* The algorithm is:
     *  For each dimension:
     *   -Allocate all chunks in the new dataspace that are beyond the original
     *    dataspace in the operating dimension, except those that have already
     *    been allocated.
     *
     * This is accomplished mainly using the min_unalloc and max_unalloc arrays.
     * min_unalloc represents the lowest offset in each dimension of chunks that
     * have not been allocated (whether or not they need to be).  max_unalloc
     * represents the highest offset in each dimension of chunks in the new
     * dataset that have not been allocated by this routine (they may have been
     * allocated previously).
     *
     * Every time the algorithm finishes allocating chunks allocated beyond a
     * certain dimension, max_unalloc is updated in order to avoid allocating
     * those chunks again.
     *
     * Note that min_unalloc & max_unalloc are in scaled coordinates.
     *
     */
    chunk_size = orig_chunk_size;
    for (op_dim = 0; op_dim < space_ndims; op_dim++) {
        H5D_chunk_ud_t udata; /* User data for querying chunk info */
        unsigned       u;     /* Local index variable */
        int            i;     /* Local index variable */

        /* Check if allocation along this dimension is really necessary */
        if (min_unalloc[op_dim] > max_unalloc[op_dim])
            continue;
        else {
            /* Reset the chunk offset indices */
            HDmemset(scaled, 0, (space_ndims * sizeof(scaled[0])));
            scaled[op_dim] = min_unalloc[op_dim];

            if (has_unfilt_edge_chunks) {
                /* Initialize nunfilt_edge_chunk_dims */
                nunfilt_edge_chunk_dims = 0;
                for (u = 0; u < space_ndims; u++)
                    if (unfilt_edge_chunk_dim[u] && scaled[u] == edge_chunk_scaled[u])
                        nunfilt_edge_chunk_dims++;

                /* Initialize chunk_size and fill_buf */
                if (should_fill && !fb_info.has_vlen_fill_type) {
                    HDassert(fb_info_init);
                    HDassert(unfilt_fill_buf);
                    if (nunfilt_edge_chunk_dims) {
                        fill_buf   = &unfilt_fill_buf;
                        chunk_size = layout->u.chunk.size;
                    } /* end if */
                    else {
                        fill_buf   = &fb_info.fill_buf;
                        chunk_size = orig_chunk_size;
                    } /* end else */
                }     /* end if */
            }         /* end if */

            carry = FALSE;
        } /* end else */

        while (!carry) {
            hbool_t need_insert = FALSE; /* Whether the chunk needs to be inserted into the index */

            /* Look up this chunk */
            if (H5D__chunk_lookup(dset, scaled, &udata) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "error looking up chunk address")
#ifndef NDEBUG
            /* None of the chunks should be allocated */
            if (H5D_CHUNK_IDX_NONE != sc->idx_type)
                HDassert(!H5F_addr_defined(udata.chunk_block.offset));

            /* Make sure the chunk is really in the dataset and outside the
             * original dimensions */
            {
                unsigned v; /* Local index variable */
                hbool_t  outside_orig = FALSE;

                for (v = 0; v < space_ndims; v++) {
                    HDassert((scaled[v] * chunk_dim[v]) < space_dim[v]);
                    if ((scaled[v] * chunk_dim[v]) >= old_dim[v])
                        outside_orig = TRUE;
                } /* end for */
                HDassert(outside_orig);
            } /* end block */
#endif        /* NDEBUG */

            /* Check for VL datatype & non-default fill value */
            if (fb_info_init && fb_info.has_vlen_fill_type) {
                /* Sanity check */
                HDassert(should_fill);
                HDassert(!unfilt_fill_buf);
#ifdef H5_HAVE_PARALLEL
                HDassert(!using_mpi); /* Can't write VL datatypes in parallel currently */
#endif

                /* Check to make sure the buffer is large enough.  It is
                 * possible (though ill-advised) for the filter to shrink the
                 * buffer.
                 */
                if (fb_info.fill_buf_size < orig_chunk_size) {
                    if (NULL ==
                        (fb_info.fill_buf = H5D__chunk_mem_realloc(fb_info.fill_buf, orig_chunk_size, pline)))
                        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
                                    "memory reallocation failed for raw data chunk")
                    fb_info.fill_buf_size = orig_chunk_size;
                } /* end if */

                /* Fill the buffer with VL datatype fill values */
                if (H5D__fill_refill_vl(&fb_info, fb_info.elmts_per_buf) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTCONVERT, FAIL, "can't refill fill value buffer")

                /* Check if there are filters which need to be applied to the chunk */
                if ((pline->nused > 0) && !nunfilt_edge_chunk_dims) {
                    H5Z_EDC_t err_detect; /* Error detection info */
                    H5Z_cb_t  filter_cb;  /* I/O filter callback function */
                    size_t    nbytes = orig_chunk_size;

                    /* Retrieve filter settings from API context */
                    if (H5CX_get_err_detect(&err_detect) < 0)
                        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get error detection info")
                    if (H5CX_get_filter_cb(&filter_cb) < 0)
                        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get I/O filter callback function")

                    /* Push the chunk through the filters */
                    if (H5Z_pipeline(pline, 0, &filter_mask, err_detect, filter_cb, &nbytes,
                                     &fb_info.fill_buf_size, &fb_info.fill_buf) < 0)
                        HGOTO_ERROR(H5E_PLINE, H5E_WRITEERROR, FAIL, "output pipeline failed")

#if H5_SIZEOF_SIZE_T > 4
                    /* Check for the chunk expanding too much to encode in a 32-bit value */
                    if (nbytes > ((size_t)0xffffffff))
                        HGOTO_ERROR(H5E_DATASET, H5E_BADRANGE, FAIL, "chunk too large for 32-bit length")
#endif /* H5_SIZEOF_SIZE_T > 4 */

                    /* Keep the number of bytes the chunk turned in to */
                    chunk_size = nbytes;
                } /* end if */
                else
                    chunk_size = layout->u.chunk.size;

                HDassert(*fill_buf == fb_info.fill_buf);
            } /* end if */

            /* Initialize the chunk information */
            udata.common.layout      = &layout->u.chunk;
            udata.common.storage     = sc;
            udata.common.scaled      = scaled;
            udata.chunk_block.offset = HADDR_UNDEF;
            H5_CHECKED_ASSIGN(udata.chunk_block.length, uint32_t, chunk_size, size_t);
            udata.filter_mask = filter_mask;

            /* Allocate the chunk (with all processes) */
            if (H5D__chunk_file_alloc(&idx_info, NULL, &udata.chunk_block, &need_insert, scaled) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTINSERT, FAIL, "unable to insert/resize chunk on chunk level")
            HDassert(H5F_addr_defined(udata.chunk_block.offset));

            /* Check if fill values should be written to chunks */
            if (should_fill) {
                /* Sanity check */
                HDassert(fb_info_init);
                HDassert(udata.chunk_block.length == chunk_size);

#ifdef H5_HAVE_PARALLEL
                /* Check if this file is accessed with an MPI-capable file driver */
                if (using_mpi) {
                    /* collect all chunk addresses to be written to
                       write collectively at the end */

                    /* allocate/resize chunk info array if no more space left */
                    if (0 == chunk_fill_info.num_chunks % 1024) {
                        void *tmp_realloc;

                        if (NULL == (tmp_realloc = H5MM_realloc(chunk_fill_info.chunk_info,
                                                                (chunk_fill_info.num_chunks + 1024) *
                                                                    sizeof(struct chunk_coll_fill_info))))
                            HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL,
                                        "memory allocation failed for chunk fill info")

                        chunk_fill_info.chunk_info = tmp_realloc;
                    }

                    /* Store info about the chunk for later */
                    chunk_fill_info.chunk_info[chunk_fill_info.num_chunks].addr = udata.chunk_block.offset;
                    chunk_fill_info.chunk_info[chunk_fill_info.num_chunks].chunk_size = chunk_size;
                    chunk_fill_info.chunk_info[chunk_fill_info.num_chunks].unfiltered_partial_chunk =
                        (*fill_buf == unfilt_fill_buf);
                    chunk_fill_info.num_chunks++;

                    /* Indicate that blocks will be written */
                    blocks_written = TRUE;
                } /* end if */
                else {
#endif /* H5_HAVE_PARALLEL */
                    if (H5F_shared_block_write(H5F_SHARED(dset->oloc.file), H5FD_MEM_DRAW,
                                               udata.chunk_block.offset, chunk_size, *fill_buf) < 0)
                        HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to write raw data to file")
#ifdef H5_HAVE_PARALLEL
                } /* end else */
#endif            /* H5_HAVE_PARALLEL */
            }     /* end if */

            /* Insert the chunk record into the index */
            if (need_insert && ops->insert)
                if ((ops->insert)(&idx_info, &udata, dset) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTINSERT, FAIL, "unable to insert chunk addr into index")

            /* Increment indices and adjust the edge chunk state */
            carry = TRUE;
            for (i = ((int)space_ndims - 1); i >= 0; --i) {
                scaled[i]++;
                if (scaled[i] > max_unalloc[i]) {
                    if ((unsigned)i == op_dim)
                        scaled[i] = min_unalloc[i];
                    else
                        scaled[i] = 0;

                    /* Check if we just left the edge in this dimension */
                    if (unfilt_edge_chunk_dim[i] && edge_chunk_scaled[i] == max_unalloc[i] &&
                        scaled[i] < edge_chunk_scaled[i]) {
                        nunfilt_edge_chunk_dims--;
                        if (should_fill && nunfilt_edge_chunk_dims == 0 && !fb_info.has_vlen_fill_type) {
                            HDassert(
                                !H5D__chunk_is_partial_edge_chunk(space_ndims, chunk_dim, scaled, space_dim));
                            fill_buf   = &fb_info.fill_buf;
                            chunk_size = orig_chunk_size;
                        } /* end if */
                    }     /* end if */
                }         /* end if */
                else {
                    /* Check if we just entered the edge in this dimension */
                    if (unfilt_edge_chunk_dim[i] && scaled[i] == edge_chunk_scaled[i]) {
                        HDassert(edge_chunk_scaled[i] == max_unalloc[i]);
                        nunfilt_edge_chunk_dims++;
                        if (should_fill && nunfilt_edge_chunk_dims == 1 && !fb_info.has_vlen_fill_type) {
                            HDassert(
                                H5D__chunk_is_partial_edge_chunk(space_ndims, chunk_dim, scaled, space_dim));
                            fill_buf   = &unfilt_fill_buf;
                            chunk_size = layout->u.chunk.size;
                        } /* end if */
                    }     /* end if */

                    carry = FALSE;
                    break;
                } /* end else */
            }     /* end for */
        }         /* end while(!carry) */

        /* Adjust max_unalloc so we don't allocate the same chunk twice.  Also
         * check if this dimension started from 0 (and hence allocated all of
         * the chunks. */
        if (min_unalloc[op_dim] == 0)
            break;
        else
            max_unalloc[op_dim] = min_unalloc[op_dim] - 1;
    } /* end for(op_dim=0...) */

#ifdef H5_HAVE_PARALLEL
    /* do final collective I/O */
    if (using_mpi && blocks_written)
        if (H5D__chunk_collective_fill(dset, &chunk_fill_info, fb_info.fill_buf, unfilt_fill_buf) < 0)
            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to write raw data to file")
#endif /* H5_HAVE_PARALLEL */

    /* Reset any cached chunk info for this dataset */
    H5D__chunk_cinfo_cache_reset(&dset->shared->cache.chunk.last);

done:
    /* Release the fill buffer info, if it's been initialized */
    if (fb_info_init && H5D__fill_term(&fb_info) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "Can't release fill buffer info")

    /* Free the unfiltered fill value buffer */
    unfilt_fill_buf = H5D__chunk_mem_xfree(unfilt_fill_buf, &def_pline);

#ifdef H5_HAVE_PARALLEL
    if (using_mpi && chunk_fill_info.chunk_info)
        H5MM_free(chunk_fill_info.chunk_info);
#endif

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_allocate() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_update_old_edge_chunks
 *
 * Purpose:     Update all chunks which were previously partial edge
 *              chunks and are now complete.  Determines exactly which
 *              chunks need to be updated and locks each into cache using
 *              the 'prev_unfilt_chunk' flag, then unlocks it, causing
 *              filters to be applied as necessary.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Neil Fortner
 *              April 14, 2010
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_update_old_edge_chunks(H5D_t *dset, hsize_t old_dim[])
{
    hsize_t old_edge_chunk_sc[H5O_LAYOUT_NDIMS]; /* Offset of first previously incomplete chunk in each
                                                    dimension */
    hsize_t max_edge_chunk_sc[H5O_LAYOUT_NDIMS]; /* largest offset of chunks that might need to be modified in
                                                    each dimension */
    hbool_t new_full_dim[H5O_LAYOUT_NDIMS];      /* Whether the plane of chunks in this dimension needs to be
                                                    modified */
    const H5O_layout_t *layout = &(dset->shared->layout); /* Dataset layout */
    hsize_t             chunk_sc[H5O_LAYOUT_NDIMS];       /* Offset of current chunk */
    const uint32_t *    chunk_dim = layout->u.chunk.dim;  /* Convenience pointer to chunk dimensions */
    unsigned            space_ndims;                      /* Dataset's space rank */
    const hsize_t *     space_dim;                        /* Dataset's dataspace dimensions */
    unsigned            op_dim;                           /* Current operationg dimension */
    H5D_io_info_t       chk_io_info;                      /* Chunked I/O info object */
    H5D_chunk_ud_t      chk_udata;                        /* User data for locking chunk */
    H5D_storage_t       chk_store;                        /* Chunk storage information */
    void *              chunk;                            /* The file chunk  */
    hbool_t             carry; /* Flag to indicate that chunk increment carrys to higher dimension (sorta) */
    herr_t              ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Check args */
    HDassert(dset && H5D_CHUNKED == layout->type);
    HDassert(layout->u.chunk.ndims > 0 && layout->u.chunk.ndims <= H5O_LAYOUT_NDIMS);
    H5D_CHUNK_STORAGE_INDEX_CHK(&layout->storage.u.chunk);
    HDassert(dset->shared->dcpl_cache.pline.nused > 0);
    HDassert(layout->u.chunk.flags & H5O_LAYOUT_CHUNK_DONT_FILTER_PARTIAL_BOUND_CHUNKS);

    /* Retrieve the dataset dimensions */
    space_dim   = dset->shared->curr_dims;
    space_ndims = dset->shared->ndims;

    /* The last dimension in chunk_offset is always 0 */
    chunk_sc[space_ndims] = (hsize_t)0;

    /* Check if any current dimensions are smaller than the chunk size, or if
     * any old dimensions are 0.  If so we do not have to do anything. */
    for (op_dim = 0; op_dim < space_ndims; op_dim++)
        if ((space_dim[op_dim] < chunk_dim[op_dim]) || old_dim[op_dim] == 0) {
            /* Reset any cached chunk info for this dataset */
            H5D__chunk_cinfo_cache_reset(&dset->shared->cache.chunk.last);
            HGOTO_DONE(SUCCEED)
        } /* end if */

    /* Set up chunked I/O info object, for operations on chunks (in callback).
     * Note that we only need to set chunk_offset once, as the array's address
     * will never change. */
    chk_store.chunk.scaled = chunk_sc;
    H5D_BUILD_IO_INFO_RD(&chk_io_info, dset, &chk_store, NULL);

    /*
     * Determine the edges of the dataset which need to be modified
     */
    for (op_dim = 0; op_dim < space_ndims; op_dim++) {
        /* Start off with this dimension marked as not needing to be modified */
        new_full_dim[op_dim] = FALSE;

        /* Validate this chunk dimension */
        if (chunk_dim[op_dim] == 0)
            HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "chunk size must be > 0, dim = %u ", op_dim)

        /* Calculate offset of first previously incomplete chunk in this
         * dimension */
        old_edge_chunk_sc[op_dim] = (old_dim[op_dim] / chunk_dim[op_dim]);

        /* Calculate the largest offset of chunks that might need to be
         * modified in this dimension */
        max_edge_chunk_sc[op_dim] = MIN((old_dim[op_dim] - 1) / chunk_dim[op_dim],
                                        MAX((space_dim[op_dim] / chunk_dim[op_dim]), 1) - 1);

        /* Check for old_dim aligned with chunk boundary in this dimension, if
         * so we do not need to modify chunks along the edge in this dimension
         */
        if (old_dim[op_dim] % chunk_dim[op_dim] == 0)
            continue;

        /* Check if the dataspace expanded enough to cause the old edge chunks
         * in this dimension to become full */
        if ((space_dim[op_dim] / chunk_dim[op_dim]) >= (old_edge_chunk_sc[op_dim] + 1))
            new_full_dim[op_dim] = TRUE;
    } /* end for */

    /* Main loop: fix old edge chunks */
    for (op_dim = 0; op_dim < space_ndims; op_dim++) {
        /* Check if allocation along this dimension is really necessary */
        if (!new_full_dim[op_dim])
            continue;
        else {
            HDassert(max_edge_chunk_sc[op_dim] == old_edge_chunk_sc[op_dim]);

            /* Reset the chunk offset indices */
            HDmemset(chunk_sc, 0, (space_ndims * sizeof(chunk_sc[0])));
            chunk_sc[op_dim] = old_edge_chunk_sc[op_dim];

            carry = FALSE;
        } /* end if */

        while (!carry) {
            int i; /* Local index variable */

            /* Make sure the chunk is really a former edge chunk */
            HDassert(H5D__chunk_is_partial_edge_chunk(space_ndims, chunk_dim, chunk_sc, old_dim) &&
                     !H5D__chunk_is_partial_edge_chunk(space_ndims, chunk_dim, chunk_sc, space_dim));

            /* Lookup the chunk */
            if (H5D__chunk_lookup(dset, chunk_sc, &chk_udata) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "error looking up chunk address")

            /* If this chunk does not exist in cache or on disk, no need to do
             * anything */
            if (H5F_addr_defined(chk_udata.chunk_block.offset) || (UINT_MAX != chk_udata.idx_hint)) {
                /* Lock the chunk into cache.  H5D__chunk_lock will take care of
                 * updating the chunk to no longer be an edge chunk. */
                if (NULL == (chunk = (void *)H5D__chunk_lock(&chk_io_info, &chk_udata, FALSE, TRUE)))
                    HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "unable to lock raw data chunk")

                /* Unlock the chunk */
                if (H5D__chunk_unlock(&chk_io_info, &chk_udata, TRUE, chunk, (uint32_t)0) < 0)
                    HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to unlock raw data chunk")
            } /* end if */

            /* Increment indices */
            carry = TRUE;
            for (i = ((int)space_ndims - 1); i >= 0; --i) {
                if ((unsigned)i != op_dim) {
                    ++chunk_sc[i];
                    if (chunk_sc[i] > (hsize_t)max_edge_chunk_sc[i])
                        chunk_sc[i] = 0;
                    else {
                        carry = FALSE;
                        break;
                    } /* end else */
                }     /* end if */
            }         /* end for */
        }             /* end while(!carry) */

        /* Adjust max_edge_chunk_sc so we don't modify the same chunk twice.
         * Also check if this dimension started from 0 (and hence modified all
         * of the old edge chunks. */
        if (old_edge_chunk_sc[op_dim] == 0)
            break;
        else
            --max_edge_chunk_sc[op_dim];
    } /* end for(op_dim=0...) */

    /* Reset any cached chunk info for this dataset */
    H5D__chunk_cinfo_cache_reset(&dset->shared->cache.chunk.last);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_update_old_edge_chunks() */

#ifdef H5_HAVE_PARALLEL

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_collective_fill
 *
 * Purpose:     Use MPIO collective write to fill the chunks (if number of
 *              chunks to fill is greater than the number of MPI procs;
 *              otherwise use independent I/O).
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Mohamad Chaarawi
 *         July 30, 2014
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_collective_fill(const H5D_t *dset, H5D_chunk_coll_fill_info_t *chunk_fill_info,
                           const void *fill_buf, const void *partial_chunk_fill_buf)
{
    MPI_Comm         mpi_comm = MPI_COMM_NULL; /* MPI communicator for file */
    int              mpi_rank = (-1);          /* This process's rank  */
    int              mpi_size = (-1);          /* MPI Comm size  */
    int              mpi_code;                 /* MPI return code */
    size_t           num_blocks;               /* Number of blocks between processes. */
    size_t           leftover_blocks;          /* Number of leftover blocks to handle */
    int              blocks, leftover;         /* converted to int for MPI */
    MPI_Aint *       chunk_disp_array = NULL;
    MPI_Aint *       block_disps      = NULL;
    int *            block_lens       = NULL;
    MPI_Datatype     mem_type = MPI_BYTE, file_type = MPI_BYTE;
    H5FD_mpio_xfer_t prev_xfer_mode;         /* Previous data xfer mode */
    hbool_t          have_xfer_mode = FALSE; /* Whether the previous xffer mode has been retrieved */
    hbool_t          need_sort      = FALSE;
    size_t           i;                   /* Local index variable */
    herr_t           ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /*
     * If a separate fill buffer is provided for partial chunks, ensure
     * that the "don't filter partial edge chunks" flag is set.
     */
    if (partial_chunk_fill_buf)
        HDassert(dset->shared->layout.u.chunk.flags & H5O_LAYOUT_CHUNK_DONT_FILTER_PARTIAL_BOUND_CHUNKS);

    /* Get the MPI communicator */
    if (MPI_COMM_NULL == (mpi_comm = H5F_mpi_get_comm(dset->oloc.file)))
        HGOTO_ERROR(H5E_INTERNAL, H5E_MPI, FAIL, "Can't retrieve MPI communicator")

    /* Get the MPI rank */
    if ((mpi_rank = H5F_mpi_get_rank(dset->oloc.file)) < 0)
        HGOTO_ERROR(H5E_INTERNAL, H5E_MPI, FAIL, "Can't retrieve MPI rank")

    /* Get the MPI size */
    if ((mpi_size = H5F_mpi_get_size(dset->oloc.file)) < 0)
        HGOTO_ERROR(H5E_INTERNAL, H5E_MPI, FAIL, "Can't retrieve MPI size")

    /* Distribute evenly the number of blocks between processes. */
    if (mpi_size == 0)
        HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "Resulted in division by zero")
    num_blocks =
        (size_t)(chunk_fill_info->num_chunks / (size_t)mpi_size); /* value should be the same on all procs */

    /* After evenly distributing the blocks between processes, are there any
     * leftover blocks for each individual process (round-robin)?
     */
    leftover_blocks = (size_t)(chunk_fill_info->num_chunks % (size_t)mpi_size);

    /* Cast values to types needed by MPI */
    H5_CHECKED_ASSIGN(blocks, int, num_blocks, size_t);
    H5_CHECKED_ASSIGN(leftover, int, leftover_blocks, size_t);

    /* Check if we have any chunks to write on this rank */
    if (num_blocks > 0 || (leftover && leftover > mpi_rank)) {
        MPI_Aint partial_fill_buf_disp = 0;
        hbool_t  all_same_block_len    = TRUE;

        /* Allocate buffers */
        if (NULL == (chunk_disp_array = (MPI_Aint *)H5MM_malloc((size_t)(blocks + 1) * sizeof(MPI_Aint))))
            HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "couldn't allocate chunk file displacement buffer")

        if (partial_chunk_fill_buf) {
            MPI_Aint fill_buf_addr;
            MPI_Aint partial_fill_buf_addr;

            /* Calculate the displacement between the fill buffer and partial chunk fill buffer */
            if (MPI_SUCCESS != (mpi_code = MPI_Get_address(fill_buf, &fill_buf_addr)))
                HMPI_GOTO_ERROR(FAIL, "MPI_Get_address failed", mpi_code)
            if (MPI_SUCCESS != (mpi_code = MPI_Get_address(partial_chunk_fill_buf, &partial_fill_buf_addr)))
                HMPI_GOTO_ERROR(FAIL, "MPI_Get_address failed", mpi_code)

#if H5_CHECK_MPI_VERSION(3, 1)
            partial_fill_buf_disp = MPI_Aint_diff(partial_fill_buf_addr, fill_buf_addr);
#else
            partial_fill_buf_disp = partial_fill_buf_addr - fill_buf_addr;
#endif

            /*
             * Allocate all-zero block displacements array. If a block's displacement
             * is left as zero, that block will be written to from the regular fill
             * buffer. If a block represents an unfiltered partial edge chunk, its
             * displacement will be set so that the block is written to from the
             * unfiltered fill buffer.
             */
            if (NULL == (block_disps = (MPI_Aint *)H5MM_calloc((size_t)(blocks + 1) * sizeof(MPI_Aint))))
                HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "couldn't allocate block displacements buffer")
        }

        /*
         * Perform initial scan of chunk info list to:
         *  - make sure that chunk addresses are monotonically non-decreasing
         *  - check if all blocks have the same length
         */
        for (i = 1; i < chunk_fill_info->num_chunks; i++) {
            if (chunk_fill_info->chunk_info[i].addr < chunk_fill_info->chunk_info[i - 1].addr)
                need_sort = TRUE;

            if (chunk_fill_info->chunk_info[i].chunk_size != chunk_fill_info->chunk_info[i - 1].chunk_size)
                all_same_block_len = FALSE;
        }

        if (need_sort)
            HDqsort(chunk_fill_info->chunk_info, chunk_fill_info->num_chunks,
                    sizeof(struct chunk_coll_fill_info), H5D__chunk_cmp_coll_fill_info);

        /* Allocate buffer for block lengths if necessary */
        if (!all_same_block_len)
            if (NULL == (block_lens = (int *)H5MM_malloc((size_t)(blocks + 1) * sizeof(int))))
                HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "couldn't allocate chunk lengths buffer")

        for (i = 0; i < (size_t)blocks; i++) {
            size_t idx = i + (size_t)(mpi_rank * blocks);

            /* store the chunk address as an MPI_Aint */
            chunk_disp_array[i] = (MPI_Aint)(chunk_fill_info->chunk_info[idx].addr);

            if (!all_same_block_len)
                H5_CHECKED_ASSIGN(block_lens[i], int, chunk_fill_info->chunk_info[idx].chunk_size, size_t);

            if (chunk_fill_info->chunk_info[idx].unfiltered_partial_chunk) {
                HDassert(partial_chunk_fill_buf);
                block_disps[i] = partial_fill_buf_disp;
            }
        } /* end for */

        /* Calculate if there are any leftover blocks after evenly
         * distributing. If there are, then round-robin the distribution
         * to processes 0 -> leftover.
         */
        if (leftover && leftover > mpi_rank) {
            chunk_disp_array[blocks] =
                (MPI_Aint)chunk_fill_info->chunk_info[(blocks * mpi_size) + mpi_rank].addr;

            if (!all_same_block_len)
                H5_CHECKED_ASSIGN(block_lens[blocks], int,
                                  chunk_fill_info->chunk_info[(blocks * mpi_size) + mpi_rank].chunk_size,
                                  size_t);

            if (chunk_fill_info->chunk_info[(blocks * mpi_size) + mpi_rank].unfiltered_partial_chunk) {
                HDassert(partial_chunk_fill_buf);
                block_disps[blocks] = partial_fill_buf_disp;
            }

            blocks++;
        }

        /* Create file and memory types for the write operation */
        if (all_same_block_len) {
            int block_len;

            H5_CHECKED_ASSIGN(block_len, int, chunk_fill_info->chunk_info[0].chunk_size, size_t);

            mpi_code =
                MPI_Type_create_hindexed_block(blocks, block_len, chunk_disp_array, MPI_BYTE, &file_type);
            if (mpi_code != MPI_SUCCESS)
                HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_hindexed_block failed", mpi_code)

            if (partial_chunk_fill_buf) {
                /*
                 * If filters are disabled for partial edge chunks, those chunks could
                 * potentially have the same block length as the other chunks, but still
                 * need to be written to using the unfiltered fill buffer. Use an hindexed
                 * block type rather than an hvector.
                 */
                mpi_code =
                    MPI_Type_create_hindexed_block(blocks, block_len, block_disps, MPI_BYTE, &mem_type);
                if (mpi_code != MPI_SUCCESS)
                    HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_hindexed_block failed", mpi_code)
            }
            else {
                mpi_code = MPI_Type_create_hvector(blocks, block_len, 0, MPI_BYTE, &mem_type);
                if (mpi_code != MPI_SUCCESS)
                    HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_hvector failed", mpi_code)
            }
        }
        else {
            /*
             * Currently, different block lengths implies that there are partial
             * edge chunks and the "don't filter partial edge chunks" flag is set.
             */
            HDassert(partial_chunk_fill_buf);
            HDassert(block_lens);
            HDassert(block_disps);

            mpi_code = MPI_Type_create_hindexed(blocks, block_lens, chunk_disp_array, MPI_BYTE, &file_type);
            if (mpi_code != MPI_SUCCESS)
                HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_hindexed failed", mpi_code)

            mpi_code = MPI_Type_create_hindexed(blocks, block_lens, block_disps, MPI_BYTE, &mem_type);
            if (mpi_code != MPI_SUCCESS)
                HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_hindexed failed", mpi_code)
        }

        if (MPI_SUCCESS != (mpi_code = MPI_Type_commit(&file_type)))
            HMPI_GOTO_ERROR(FAIL, "MPI_Type_commit failed", mpi_code)
        if (MPI_SUCCESS != (mpi_code = MPI_Type_commit(&mem_type)))
            HMPI_GOTO_ERROR(FAIL, "MPI_Type_commit failed", mpi_code)
    } /* end if */

    /* Set MPI-IO VFD properties */

    /* Set MPI datatypes for operation */
    if (H5CX_set_mpi_coll_datatypes(mem_type, file_type) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "can't set MPI-I/O properties")

    /* Get current transfer mode */
    if (H5CX_get_io_xfer_mode(&prev_xfer_mode) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "can't set transfer mode")
    have_xfer_mode = TRUE;

    /* Set transfer mode */
    if (H5CX_set_io_xfer_mode(H5FD_MPIO_COLLECTIVE) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "can't set transfer mode")

    /* Low-level write (collective) */
    if (H5F_shared_block_write(H5F_SHARED(dset->oloc.file), H5FD_MEM_DRAW, (haddr_t)0,
                               (blocks) ? (size_t)1 : (size_t)0, fill_buf) < 0)
        HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to write raw data to file")

    /* Barrier so processes don't race ahead */
    if (MPI_SUCCESS != (mpi_code = MPI_Barrier(mpi_comm)))
        HMPI_GOTO_ERROR(FAIL, "MPI_Barrier failed", mpi_code)

done:
    if (have_xfer_mode)
        /* Set transfer mode */
        if (H5CX_set_io_xfer_mode(prev_xfer_mode) < 0)
            HDONE_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "can't set transfer mode")

    /* free things */
    if (MPI_BYTE != file_type)
        if (MPI_SUCCESS != (mpi_code = MPI_Type_free(&file_type)))
            HMPI_DONE_ERROR(FAIL, "MPI_Type_free failed", mpi_code)
    if (MPI_BYTE != mem_type)
        if (MPI_SUCCESS != (mpi_code = MPI_Type_free(&mem_type)))
            HMPI_DONE_ERROR(FAIL, "MPI_Type_free failed", mpi_code)
    H5MM_xfree(chunk_disp_array);
    H5MM_xfree(block_disps);
    H5MM_xfree(block_lens);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_collective_fill() */

static int
H5D__chunk_cmp_coll_fill_info(const void *_entry1, const void *_entry2)
{
    const struct chunk_coll_fill_info *entry1;
    const struct chunk_coll_fill_info *entry2;

    FUNC_ENTER_PACKAGE_NOERR

    entry1 = (const struct chunk_coll_fill_info *)_entry1;
    entry2 = (const struct chunk_coll_fill_info *)_entry2;

    FUNC_LEAVE_NOAPI(H5F_addr_cmp(entry1->addr, entry2->addr))
} /* end H5D__chunk_cmp_coll_fill_info() */
#endif /* H5_HAVE_PARALLEL */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_prune_fill
 *
 * Purpose:    Write the fill value to the parts of the chunk that are no
 *              longer part of the dataspace
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Pedro Vicente
 *              March 26, 2002
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__chunk_prune_fill(H5D_chunk_it_ud1_t *udata, hbool_t new_unfilt_chunk)
{
    const H5D_io_info_t *io_info         = udata->io_info;          /* Local pointer to I/O info */
    const H5D_t *        dset            = io_info->dset;           /* Local pointer to the dataset info */
    const H5O_layout_t * layout          = &(dset->shared->layout); /* Dataset's layout */
    unsigned             rank            = udata->common.layout->ndims - 1; /* Dataset rank */
    const hsize_t *      scaled          = udata->common.scaled;            /* Scaled chunk offset */
    H5S_sel_iter_t *     chunk_iter      = NULL;  /* Memory selection iteration info */
    hbool_t              chunk_iter_init = FALSE; /* Whether the chunk iterator has been initialized */
    hsize_t              sel_nelmts;              /* Number of elements in selection */
    hsize_t              count[H5O_LAYOUT_NDIMS]; /* Element count of hyperslab */
    size_t               chunk_size;              /*size of a chunk       */
    void *               chunk;                   /* The file chunk  */
    H5D_chunk_ud_t       chk_udata;               /* User data for locking chunk */
    uint32_t             bytes_accessed;          /* Bytes accessed in chunk */
    unsigned             u;                       /* Local index variable */
    herr_t               ret_value = SUCCEED;     /* Return value */

    FUNC_ENTER_PACKAGE

    /* Get the chunk's size */
    HDassert(layout->u.chunk.size > 0);
    H5_CHECKED_ASSIGN(chunk_size, size_t, layout->u.chunk.size, uint32_t);

    /* Get the info for the chunk in the file */
    if (H5D__chunk_lookup(dset, scaled, &chk_udata) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "error looking up chunk address")
    chk_udata.new_unfilt_chunk = new_unfilt_chunk;

    /* If this chunk does not exist in cache or on disk, no need to do anything */
    if (!H5F_addr_defined(chk_udata.chunk_block.offset) && UINT_MAX == chk_udata.idx_hint)
        HGOTO_DONE(SUCCEED)

    /* Initialize the fill value buffer, if necessary */
    if (!udata->fb_info_init) {
        H5_CHECK_OVERFLOW(udata->elmts_per_chunk, uint32_t, size_t);
        if (H5D__fill_init(&udata->fb_info, NULL, NULL, NULL, NULL, NULL, &dset->shared->dcpl_cache.fill,
                           dset->shared->type, dset->shared->type_id, (size_t)udata->elmts_per_chunk,
                           chunk_size) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't initialize fill buffer info")
        udata->fb_info_init = TRUE;
    } /* end if */

    /* Compute the # of elements to leave with existing value, in each dimension */
    for (u = 0; u < rank; u++) {
        count[u] = MIN(layout->u.chunk.dim[u], (udata->space_dim[u] - (scaled[u] * layout->u.chunk.dim[u])));
        HDassert(count[u] > 0);
    } /* end for */

    /* Select all elements in chunk, to begin with */
    if (H5S_select_all(udata->chunk_space, TRUE) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTSELECT, FAIL, "unable to select space")

    /* "Subtract out" the elements to keep */
    if (H5S_select_hyperslab(udata->chunk_space, H5S_SELECT_NOTB, udata->hyper_start, NULL, count, NULL) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTSELECT, FAIL, "unable to select hyperslab")

    /* Lock the chunk into the cache, to get a pointer to the chunk buffer */
    if (NULL == (chunk = (void *)H5D__chunk_lock(io_info, &chk_udata, FALSE, FALSE)))
        HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL, "unable to lock raw data chunk")

    /* Fill the selection in the memory buffer */
    /* Use the size of the elements in the chunk directly instead of */
    /* relying on the fill.size, which might be set to 0 if there is */
    /* no fill-value defined for the dataset -QAK */

    /* Get the number of elements in the selection */
    sel_nelmts = H5S_GET_SELECT_NPOINTS(udata->chunk_space);
    H5_CHECK_OVERFLOW(sel_nelmts, hsize_t, size_t);

    /* Check for VL datatype & non-default fill value */
    if (udata->fb_info.has_vlen_fill_type)
        /* Re-fill the buffer to use for this I/O operation */
        if (H5D__fill_refill_vl(&udata->fb_info, (size_t)sel_nelmts) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTCONVERT, FAIL, "can't refill fill value buffer")

    /* Allocate the chunk selection iterator */
    if (NULL == (chunk_iter = H5FL_MALLOC(H5S_sel_iter_t)))
        HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "can't allocate chunk selection iterator")

    /* Create a selection iterator for scattering the elements to memory buffer */
    if (H5S_select_iter_init(chunk_iter, udata->chunk_space, layout->u.chunk.dim[rank], 0) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to initialize chunk selection information")
    chunk_iter_init = TRUE;

    /* Scatter the data into memory */
    if (H5D__scatter_mem(udata->fb_info.fill_buf, chunk_iter, (size_t)sel_nelmts, chunk /*out*/) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_WRITEERROR, FAIL, "scatter failed")

    /* The number of bytes accessed in the chunk */
    /* (i.e. the bytes replaced with fill values) */
    H5_CHECK_OVERFLOW(sel_nelmts, hsize_t, uint32_t);
    bytes_accessed = (uint32_t)sel_nelmts * layout->u.chunk.dim[rank];

    /* Release lock on chunk */
    if (H5D__chunk_unlock(io_info, &chk_udata, TRUE, chunk, bytes_accessed) < 0)
        HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to unlock raw data chunk")

done:
    /* Release the selection iterator */
    if (chunk_iter_init && H5S_SELECT_ITER_RELEASE(chunk_iter) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "Can't release selection iterator")
    if (chunk_iter)
        chunk_iter = H5FL_FREE(H5S_sel_iter_t, chunk_iter);

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D__chunk_prune_fill */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_prune_by_extent
 *
 * Purpose:    This function searches for chunks that are no longer necessary
 *              both in the raw data cache and in the chunk index.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Pedro Vicente
 * Algorithm:    Robb Matzke
 *         March 27, 2002
 *
 * The algorithm is:
 *
 *  For chunks that are no longer necessary:
 *
 *  1. Search in the raw data cache for each chunk
 *  2. If found then preempt it from the cache
 *  3. Search in the B-tree for each chunk
 *  4. If found then remove it from the B-tree and deallocate file storage for the chunk
 *
 * This example shows a 2d dataset of 90x90 with a chunk size of 20x20.
 *
 *
 *     0         20        40        60        80    90   100
 *    0 +---------+---------+---------+---------+-----+...+
 *      |:::::X::::::::::::::         :         :     |   :
 *      |:::::::X::::::::::::         :         :     |   :   Key
 *      |::::::::::X:::::::::         :         :     |   :   --------
 *      |::::::::::::X:::::::         :         :     |   :  +-+ Dataset
 *    20+::::::::::::::::::::.........:.........:.....+...:  | | Extent
 *      |         :::::X:::::         :         :     |   :  +-+
 *      |         :::::::::::         :         :     |   :
 *      |         :::::::::::         :         :     |   :  ... Chunk
 *      |         :::::::X:::         :         :     |   :  : : Boundary
 *    40+.........:::::::::::.........:.........:.....+...:  :.:
 *      |         :         :         :         :     |   :
 *      |         :         :         :         :     |   :  ... Allocated
 *      |         :         :         :         :     |   :  ::: & Filled
 *      |         :         :         :         :     |   :  ::: Chunk
 *    60+.........:.........:.........:.........:.....+...:
 *      |         :         :::::::X:::         :     |   :   X  Element
 *      |         :         :::::::::::         :     |   :      Written
 *      |         :         :::::::::::         :     |   :
 *      |         :         :::::::::::         :     |   :
 *    80+.........:.........:::::::::::.........:.....+...:   O  Fill Val
 *      |         :         :         :::::::::::     |   :      Explicitly
 *      |         :         :         ::::::X::::     |   :      Written
 *    90+---------+---------+---------+---------+-----+   :
 *      :         :         :         :::::::::::         :
 *   100:.........:.........:.........:::::::::::.........:
 *
 *
 * We have 25 total chunks for this dataset, 5 of which have space
 * allocated in the file because they were written to one or more
 * elements. These five chunks (and only these five) also have entries in
 * the storage B-tree for this dataset.
 *
 * Now lets say we want to shrink the dataset down to 70x70:
 *
 *
 *      0         20        40        60   70   80    90   100
 *    0 +---------+---------+---------+----+----+-----+...+
 *      |:::::X::::::::::::::         :    |    :     |   :
 *      |:::::::X::::::::::::         :    |    :     |   :    Key
 *      |::::::::::X:::::::::         :    |    :     |   :    --------
 *      |::::::::::::X:::::::         :    |    :     |   :   +-+ Dataset
 *    20+::::::::::::::::::::.........:....+....:.....|...:   | | Extent
 *      |         :::::X:::::         :    |    :     |   :   +-+
 *      |         :::::::::::         :    |    :     |   :
 *      |         :::::::::::         :    |    :     |   :   ... Chunk
 *      |         :::::::X:::         :    |    :     |   :   : : Boundary
 *    40+.........:::::::::::.........:....+....:.....|...:   :.:
 *      |         :         :         :    |    :     |   :
 *      |         :         :         :    |    :     |   :   ... Allocated
 *      |         :         :         :    |    :     |   :   ::: & Filled
 *      |         :         :         :    |    :     |   :   ::: Chunk
 *    60+.........:.........:.........:....+....:.....|...:
 *      |         :         :::::::X:::    |    :     |   :    X  Element
 *      |         :         :::::::::::    |    :     |   :       Written
 *      +---------+---------+---------+----+    :     |   :
 *      |         :         :::::::::::         :     |   :
 *    80+.........:.........:::::::::X:.........:.....|...:    O  Fill Val
 *      |         :         :         :::::::::::     |   :       Explicitly
 *      |         :         :         ::::::X::::     |   :       Written
 *    90+---------+---------+---------+---------+-----+   :
 *      :         :         :         :::::::::::         :
 *   100:.........:.........:.........:::::::::::.........:
 *
 *
 * That means that the nine chunks along the bottom and right side should
 * no longer exist. Of those nine chunks, (0,80), (20,80), (40,80),
 * (60,80), (80,80), (80,60), (80,40), (80,20), and (80,0), one is actually allocated
 * that needs to be released.
 * To release the chunks, we traverse the B-tree to obtain a list of unused
 * allocated chunks, and then call H5B_remove() for each chunk.
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_prune_by_extent(H5D_t *dset, const hsize_t *old_dim)
{
    hsize_t min_mod_chunk_sc[H5O_LAYOUT_NDIMS]; /* Scaled offset of first chunk to modify in each dimension */
    hsize_t max_mod_chunk_sc[H5O_LAYOUT_NDIMS]; /* Scaled offset of last chunk to modify in each dimension */
    hssize_t max_fill_chunk_sc[H5O_LAYOUT_NDIMS]; /* Scaled offset of last chunk that might be filled in each
                                                     dimension */
    hbool_t fill_dim[H5O_LAYOUT_NDIMS]; /* Whether the plane of edge chunks in this dimension needs to be
                                           filled */
    hsize_t min_partial_chunk_sc[H5O_LAYOUT_NDIMS]; /* Offset of first partial (or empty) chunk in each
                                                       dimension */
    hbool_t new_unfilt_dim[H5O_LAYOUT_NDIMS]; /* Whether the plane of edge chunks in this dimension are newly
                                                 unfiltered */
    H5D_chk_idx_info_t  idx_info;             /* Chunked index info */
    H5D_io_info_t       chk_io_info;          /* Chunked I/O info object */
    H5D_storage_t       chk_store;            /* Chunk storage information */
    const H5O_layout_t *layout = &(dset->shared->layout);      /* Dataset's layout */
    const H5D_rdcc_t *  rdcc   = &(dset->shared->cache.chunk); /*raw data chunk cache */
    unsigned            space_ndims;                           /* Dataset's space rank */
    const hsize_t *     space_dim;                             /* Current dataspace dimensions */
    unsigned            op_dim;                                /* Current operating dimension */
    hbool_t             shrunk_dim[H5O_LAYOUT_NDIMS];          /* Dimensions which have shrunk */
    H5D_chunk_it_ud1_t  udata;                                 /* Chunk index iterator user data */
    hbool_t udata_init = FALSE;      /* Whether the chunk index iterator user data has been initialized */
    H5D_chunk_common_ud_t idx_udata; /* User data for index removal routine */
    H5S_t *               chunk_space = NULL;            /* Dataspace for a chunk */
    hsize_t               chunk_dim[H5O_LAYOUT_NDIMS];   /* Chunk dimensions */
    hsize_t               scaled[H5O_LAYOUT_NDIMS];      /* Scaled offset of current chunk */
    hsize_t               hyper_start[H5O_LAYOUT_NDIMS]; /* Starting location of hyperslab */
    uint32_t              elmts_per_chunk;               /* Elements in chunk */
    hbool_t  disable_edge_filters = FALSE; /* Whether to disable filters on partial edge chunks */
    hbool_t  new_unfilt_chunk     = FALSE; /* Whether the chunk is newly unfiltered */
    unsigned u;                            /* Local index variable */
    const H5O_storage_chunk_t *sc        = &(layout->storage.u.chunk);
    herr_t                     ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Check args */
    HDassert(dset && H5D_CHUNKED == layout->type);
    HDassert(layout->u.chunk.ndims > 0 && layout->u.chunk.ndims <= H5O_LAYOUT_NDIMS);
    H5D_CHUNK_STORAGE_INDEX_CHK(sc);

    /* Go get the rank & dimensions (including the element size) */
    space_dim   = dset->shared->curr_dims;
    space_ndims = dset->shared->ndims;

    /* The last dimension in scaled is always 0 */
    scaled[space_ndims] = (hsize_t)0;

    /* Check if any old dimensions are 0, if so we do not have to do anything */
    for (op_dim = 0; op_dim < (unsigned)space_ndims; op_dim++)
        if (old_dim[op_dim] == 0) {
            /* Reset any cached chunk info for this dataset */
            H5D__chunk_cinfo_cache_reset(&dset->shared->cache.chunk.last);
            HGOTO_DONE(SUCCEED)
        } /* end if */

    /* Round up to the next integer # of chunks, to accommodate partial chunks */
    /* Use current dims because the indices have already been updated! -NAF */
    /* (also compute the number of elements per chunk) */
    /* (also copy the chunk dimensions into 'hsize_t' array for creating dataspace) */
    /* (also compute the dimensions which have been shrunk) */
    elmts_per_chunk = 1;
    for (u = 0; u < space_ndims; u++) {
        elmts_per_chunk *= layout->u.chunk.dim[u];
        chunk_dim[u]  = layout->u.chunk.dim[u];
        shrunk_dim[u] = (space_dim[u] < old_dim[u]);
    } /* end for */

    /* Create a dataspace for a chunk & set the extent */
    if (NULL == (chunk_space = H5S_create_simple(space_ndims, chunk_dim, NULL)))
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCREATE, FAIL, "can't create simple dataspace")

    /* Reset hyperslab start array */
    /* (hyperslabs will always start from origin) */
    HDmemset(hyper_start, 0, sizeof(hyper_start));

    /* Set up chunked I/O info object, for operations on chunks (in callback)
     * Note that we only need to set scaled once, as the array's address
     * will never change. */
    chk_store.chunk.scaled = scaled;
    H5D_BUILD_IO_INFO_RD(&chk_io_info, dset, &chk_store, NULL);

    /* Compose chunked index info struct */
    idx_info.f       = dset->oloc.file;
    idx_info.pline   = &dset->shared->dcpl_cache.pline;
    idx_info.layout  = &dset->shared->layout.u.chunk;
    idx_info.storage = &dset->shared->layout.storage.u.chunk;

    /* Initialize the user data for the iteration */
    HDmemset(&udata, 0, sizeof udata);
    udata.common.layout   = &layout->u.chunk;
    udata.common.storage  = sc;
    udata.common.scaled   = scaled;
    udata.io_info         = &chk_io_info;
    udata.idx_info        = &idx_info;
    udata.space_dim       = space_dim;
    udata.shrunk_dim      = shrunk_dim;
    udata.elmts_per_chunk = elmts_per_chunk;
    udata.chunk_space     = chunk_space;
    udata.hyper_start     = hyper_start;
    udata_init            = TRUE;

    /* Initialize user data for removal */
    idx_udata.layout  = &layout->u.chunk;
    idx_udata.storage = sc;

    /* Determine if partial edge chunk filters are disabled */
    disable_edge_filters = (layout->u.chunk.flags & H5O_LAYOUT_CHUNK_DONT_FILTER_PARTIAL_BOUND_CHUNKS) &&
                           (idx_info.pline->nused > 0);

    /*
     * Determine the chunks which need to be filled or removed
     */
    HDmemset(min_mod_chunk_sc, 0, sizeof(min_mod_chunk_sc));
    HDmemset(max_mod_chunk_sc, 0, sizeof(max_mod_chunk_sc));
    for (op_dim = 0; op_dim < (unsigned)space_ndims; op_dim++) {
        /* Validate this chunk dimension */
        if (chunk_dim[op_dim] == 0)
            HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "chunk size must be > 0, dim = %u ", op_dim)

        /* Calculate the largest offset of chunks that might need to be
         * modified in this dimension */
        max_mod_chunk_sc[op_dim] = (old_dim[op_dim] - 1) / chunk_dim[op_dim];

        /* Calculate the largest offset of chunks that might need to be
         * filled in this dimension */
        if (0 == space_dim[op_dim])
            max_fill_chunk_sc[op_dim] = -1;
        else
            max_fill_chunk_sc[op_dim] =
                (hssize_t)(((MIN(space_dim[op_dim], old_dim[op_dim]) - 1) / chunk_dim[op_dim]));

        if (shrunk_dim[op_dim]) {
            /* Calculate the smallest offset of chunks that might need to be
             * modified in this dimension.  Note that this array contains
             * garbage for all dimensions which are not shrunk.  These locations
             * must not be read from! */
            min_mod_chunk_sc[op_dim] = space_dim[op_dim] / chunk_dim[op_dim];

            /* Determine if we need to fill chunks in this dimension */
            if ((hssize_t)min_mod_chunk_sc[op_dim] == max_fill_chunk_sc[op_dim]) {
                fill_dim[op_dim] = TRUE;

                /* If necessary, check if chunks in this dimension that need to
                 * be filled are new partial edge chunks */
                if (disable_edge_filters && old_dim[op_dim] >= (min_mod_chunk_sc[op_dim] + 1))
                    new_unfilt_dim[op_dim] = TRUE;
                else
                    new_unfilt_dim[op_dim] = FALSE;
            } /* end if */
            else {
                fill_dim[op_dim]       = FALSE;
                new_unfilt_dim[op_dim] = FALSE;
            } /* end else */
        }     /* end if */
        else {
            fill_dim[op_dim]       = FALSE;
            new_unfilt_dim[op_dim] = FALSE;
        } /* end else */

        /* If necessary, calculate the smallest offset of non-previously full
         * chunks in this dimension, so we know these chunks were previously
         * unfiltered */
        if (disable_edge_filters)
            min_partial_chunk_sc[op_dim] = old_dim[op_dim] / chunk_dim[op_dim];
    } /* end for */

    /* Main loop: fill or remove chunks */
    for (op_dim = 0; op_dim < (unsigned)space_ndims; op_dim++) {
        hbool_t dims_outside_fill[H5O_LAYOUT_NDIMS]; /* Dimensions in chunk offset outside fill dimensions */
        int     ndims_outside_fill; /* Number of dimensions in chunk offset outside fill dimensions */
        hbool_t carry; /* Flag to indicate that chunk increment carrys to higher dimension (sorta) */

        /* Check if modification along this dimension is really necessary */
        if (!shrunk_dim[op_dim])
            continue;
        else {
            HDassert(max_mod_chunk_sc[op_dim] >= min_mod_chunk_sc[op_dim]);

            /* Reset the chunk offset indices */
            HDmemset(scaled, 0, (space_ndims * sizeof(scaled[0])));
            scaled[op_dim] = min_mod_chunk_sc[op_dim];

            /* Initialize "dims_outside_fill" array */
            ndims_outside_fill = 0;
            for (u = 0; u < space_ndims; u++)
                if ((hssize_t)scaled[u] > max_fill_chunk_sc[u]) {
                    dims_outside_fill[u] = TRUE;
                    ndims_outside_fill++;
                } /* end if */
                else
                    dims_outside_fill[u] = FALSE;
        } /* end else */

        carry = FALSE;
        while (!carry) {
            int i; /* Local index variable */

            udata.common.scaled = scaled;

            if (0 == ndims_outside_fill) {
                HDassert(fill_dim[op_dim]);
                HDassert(scaled[op_dim] == min_mod_chunk_sc[op_dim]);

                /* Make sure this is an edge chunk */
                HDassert(
                    H5D__chunk_is_partial_edge_chunk(space_ndims, layout->u.chunk.dim, scaled, space_dim));

                /* Determine if the chunk just became an unfiltered chunk */
                if (new_unfilt_dim[op_dim]) {
                    new_unfilt_chunk = TRUE;
                    for (u = 0; u < space_ndims; u++)
                        if (scaled[u] == min_partial_chunk_sc[u]) {
                            new_unfilt_chunk = FALSE;
                            break;
                        } /* end if */
                }         /* end if */

                /* Make sure that, if we think this is a new unfiltered chunk,
                 * it was previously not an edge chunk */
                HDassert(!new_unfilt_dim[op_dim] ||
                         (!new_unfilt_chunk != !H5D__chunk_is_partial_edge_chunk(
                                                   space_ndims, layout->u.chunk.dim, scaled, old_dim)));
                HDassert(!new_unfilt_chunk || new_unfilt_dim[op_dim]);

                /* Fill the unused parts of the chunk */
                if (H5D__chunk_prune_fill(&udata, new_unfilt_chunk) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_WRITEERROR, FAIL, "unable to write fill value")
            } /* end if */
            else {
                H5D_chunk_ud_t chk_udata; /* User data for getting chunk info */

#ifndef NDEBUG
                /* Make sure this chunk is really outside the new dimensions */
                {
                    hbool_t outside_dim = FALSE;

                    for (u = 0; u < space_ndims; u++)
                        if ((scaled[u] * chunk_dim[u]) >= space_dim[u]) {
                            outside_dim = TRUE;
                            break;
                        } /* end if */
                    HDassert(outside_dim);
                } /* end block */
#endif            /* NDEBUG */

                /* Check if the chunk exists in cache or on disk */
                if (H5D__chunk_lookup(dset, scaled, &chk_udata) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "error looking up chunk")

                /* Evict the entry from the cache if present, but do not flush
                 * it to disk */
                if (UINT_MAX != chk_udata.idx_hint)
                    if (H5D__chunk_cache_evict(dset, rdcc->slot[chk_udata.idx_hint], FALSE) < 0)
                        HGOTO_ERROR(H5E_DATASET, H5E_CANTREMOVE, FAIL, "unable to evict chunk")

                /* Remove the chunk from disk, if present */
                if (H5F_addr_defined(chk_udata.chunk_block.offset)) {
                    /* Update the offset in idx_udata */
                    idx_udata.scaled = udata.common.scaled;

                    /* Remove the chunk from disk */
                    if ((sc->ops->remove)(&idx_info, &idx_udata) < 0)
                        HGOTO_ERROR(H5E_DATASET, H5E_CANTDELETE, FAIL,
                                    "unable to remove chunk entry from index")
                } /* end if */
            }     /* end else */

            /* Increment indices */
            carry = TRUE;
            for (i = (int)(space_ndims - 1); i >= 0; --i) {
                scaled[i]++;
                if (scaled[i] > max_mod_chunk_sc[i]) {
                    /* Left maximum dimensions, "wrap around" and check if this
                     * dimension is no longer outside the fill dimension */
                    if ((unsigned)i == op_dim) {
                        scaled[i] = min_mod_chunk_sc[i];
                        if (dims_outside_fill[i] && fill_dim[i]) {
                            dims_outside_fill[i] = FALSE;
                            ndims_outside_fill--;
                        } /* end if */
                    }     /* end if */
                    else {
                        scaled[i] = 0;
                        if (dims_outside_fill[i] && max_fill_chunk_sc[i] >= 0) {
                            dims_outside_fill[i] = FALSE;
                            ndims_outside_fill--;
                        } /* end if */
                    }     /* end else */
                }         /* end if */
                else {
                    /* Check if we just went outside the fill dimension */
                    if (!dims_outside_fill[i] && (hssize_t)scaled[i] > max_fill_chunk_sc[i]) {
                        dims_outside_fill[i] = TRUE;
                        ndims_outside_fill++;
                    } /* end if */

                    /* We found the next chunk, so leave the loop */
                    carry = FALSE;
                    break;
                } /* end else */
            }     /* end for */
        }         /* end while(!carry) */

        /* Adjust max_mod_chunk_sc so we don't modify the same chunk twice.
         * Also check if this dimension started from 0 (and hence removed all
         * of the chunks). */
        if (min_mod_chunk_sc[op_dim] == 0)
            break;
        else
            max_mod_chunk_sc[op_dim] = min_mod_chunk_sc[op_dim] - 1;
    } /* end for(op_dim=0...) */

    /* Reset any cached chunk info for this dataset */
    H5D__chunk_cinfo_cache_reset(&dset->shared->cache.chunk.last);

done:
    /* Release resources */
    if (chunk_space && H5S_close(chunk_space) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CLOSEERROR, FAIL, "unable to release dataspace")
    if (udata_init)
        if (udata.fb_info_init && H5D__fill_term(&udata.fb_info) < 0)
            HDONE_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "Can't release fill buffer info")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_prune_by_extent() */

#ifdef H5_HAVE_PARALLEL

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_addrmap_cb
 *
 * Purpose:     Callback when obtaining the chunk addresses for all existing chunks
 *
 * Return:    Success:    Non-negative
 *        Failure:    Negative
 *
 * Programmer:    Kent Yang
 *              Tuesday, November 15, 2005
 *
 *-------------------------------------------------------------------------
 */
static int
H5D__chunk_addrmap_cb(const H5D_chunk_rec_t *chunk_rec, void *_udata)
{
    H5D_chunk_it_ud2_t *udata = (H5D_chunk_it_ud2_t *)_udata;    /* User data for callback */
    unsigned            rank  = udata->common.layout->ndims - 1; /* # of dimensions of dataset */
    hsize_t             chunk_index;

    FUNC_ENTER_PACKAGE_NOERR

    /* Compute the index for this chunk */
    chunk_index = H5VM_array_offset_pre(rank, udata->common.layout->down_chunks, chunk_rec->scaled);

    /* Set it in the userdata to return */
    udata->chunk_addr[chunk_index] = chunk_rec->chunk_addr;

    FUNC_LEAVE_NOAPI(H5_ITER_CONT)
} /* H5D__chunk_addrmap_cb() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_addrmap
 *
 * Purpose:     Obtain the chunk addresses for all existing chunks
 *
 * Return:    Success:    Non-negative on succeed.
 *        Failure:    negative value
 *
 * Programmer:  Kent Yang
 *              November 15, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_addrmap(const H5D_io_info_t *io_info, haddr_t chunk_addr[])
{
    H5D_chk_idx_info_t   idx_info;             /* Chunked index info */
    const H5D_t *        dset = io_info->dset; /* Local pointer to dataset info */
    H5D_chunk_it_ud2_t   udata;                /* User data for iteration callback */
    H5O_storage_chunk_t *sc        = &(dset->shared->layout.storage.u.chunk);
    herr_t               ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    HDassert(dset);
    HDassert(dset->shared);
    H5D_CHUNK_STORAGE_INDEX_CHK(sc);
    HDassert(chunk_addr);

    /* Set up user data for B-tree callback */
    HDmemset(&udata, 0, sizeof(udata));
    udata.common.layout  = &dset->shared->layout.u.chunk;
    udata.common.storage = sc;
    udata.chunk_addr     = chunk_addr;

    /* Compose chunked index info struct */
    idx_info.f       = dset->oloc.file;
    idx_info.pline   = &dset->shared->dcpl_cache.pline;
    idx_info.layout  = &dset->shared->layout.u.chunk;
    idx_info.storage = sc;

    /* Iterate over chunks to build mapping of chunk addresses */
    if ((sc->ops->iterate)(&idx_info, H5D__chunk_addrmap_cb, &udata) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "unable to iterate over chunk index to build address map")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_addrmap() */
#endif /* H5_HAVE_PARALLEL */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_delete
 *
 * Purpose:    Delete raw data storage for entire dataset (i.e. all chunks)
 *
 * Return:    Success:    Non-negative
 *        Failure:    negative
 *
 * Programmer:    Quincey Koziol
 *              Thursday, March 20, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_delete(H5F_t *f, H5O_t *oh, H5O_storage_t *storage)
{
    H5D_chk_idx_info_t idx_info;            /* Chunked index info */
    H5O_layout_t       layout;              /* Dataset layout  message */
    hbool_t            layout_read = FALSE; /* Whether the layout message was read from the file */
    H5O_pline_t        pline;               /* I/O pipeline message */
    hbool_t            pline_read = FALSE;  /* Whether the I/O pipeline message was read from the file */
    htri_t             exists;              /* Flag if header message of interest exists */
    herr_t             ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    HDassert(f);
    HDassert(oh);
    HDassert(storage);
    H5D_CHUNK_STORAGE_INDEX_CHK(&storage->u.chunk);

    /* Check for I/O pipeline message */
    if ((exists = H5O_msg_exists_oh(oh, H5O_PLINE_ID)) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to check for object header message")
    else if (exists) {
        if (NULL == H5O_msg_read_oh(f, oh, H5O_PLINE_ID, &pline))
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get I/O pipeline message")
        pline_read = TRUE;
    } /* end else if */
    else
        HDmemset(&pline, 0, sizeof(pline));

    /* Retrieve dataset layout message */
    if ((exists = H5O_msg_exists_oh(oh, H5O_LAYOUT_ID)) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to check for object header message")
    else if (exists) {
        if (NULL == H5O_msg_read_oh(f, oh, H5O_LAYOUT_ID, &layout))
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get layout message")
        layout_read = TRUE;
    } /* end else if */
    else
        HGOTO_ERROR(H5E_DATASET, H5E_NOTFOUND, FAIL, "can't find layout message")

    /* Compose chunked index info struct */
    idx_info.f       = f;
    idx_info.pline   = &pline;
    idx_info.layout  = &layout.u.chunk;
    idx_info.storage = &storage->u.chunk;

    /* Delete the chunked storage information in the file */
    if ((storage->u.chunk.ops->idx_delete)(&idx_info) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTDELETE, FAIL, "unable to delete chunk index")

done:
    /* Clean up any messages read in */
    if (pline_read)
        if (H5O_msg_reset(H5O_PLINE_ID, &pline) < 0)
            HDONE_ERROR(H5E_DATASET, H5E_CANTRESET, FAIL, "unable to reset I/O pipeline message")
    if (layout_read)
        if (H5O_msg_reset(H5O_LAYOUT_ID, &layout) < 0)
            HDONE_ERROR(H5E_DATASET, H5E_CANTRESET, FAIL, "unable to reset layout message")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_delete() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_update_cache
 *
 * Purpose:    Update any cached chunks index values after the dataspace
 *              size has changed
 *
 * Return:    Success:    Non-negative
 *        Failure:    negative
 *
 * Programmer:    Quincey Koziol
 *              Saturday, May 29, 2004
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_update_cache(H5D_t *dset)
{
    H5D_rdcc_t *    rdcc = &(dset->shared->cache.chunk); /*raw data chunk cache */
    H5D_rdcc_ent_t *ent, *next;                          /*cache entry  */
    H5D_rdcc_ent_t  tmp_head;                            /* Sentinel entry for temporary entry list */
    H5D_rdcc_ent_t *tmp_tail;                            /* Tail pointer for temporary entry list */
    herr_t          ret_value = SUCCEED;                 /* Return value */

    FUNC_ENTER_PACKAGE

    /* Check args */
    HDassert(dset && H5D_CHUNKED == dset->shared->layout.type);
    HDassert(dset->shared->layout.u.chunk.ndims > 0 &&
             dset->shared->layout.u.chunk.ndims <= H5O_LAYOUT_NDIMS);

    /* Check the rank */
    HDassert((dset->shared->layout.u.chunk.ndims - 1) > 1);

    /* Add temporary entry list to rdcc */
    (void)HDmemset(&tmp_head, 0, sizeof(tmp_head));
    rdcc->tmp_head = &tmp_head;
    tmp_tail       = &tmp_head;

    /* Recompute the index for each cached chunk that is in a dataset */
    for (ent = rdcc->head; ent; ent = next) {
        unsigned old_idx; /* Previous index number    */

        /* Get the pointer to the next cache entry */
        next = ent->next;

        /* Compute the index for the chunk entry */
        old_idx  = ent->idx; /* Save for later */
        ent->idx = H5D__chunk_hash_val(dset->shared, ent->scaled);

        if (old_idx != ent->idx) {
            H5D_rdcc_ent_t *old_ent; /* Old cache entry  */

            /* Check if there is already a chunk at this chunk's new location */
            old_ent = rdcc->slot[ent->idx];
            if (old_ent != NULL) {
                HDassert(old_ent->locked == FALSE);
                HDassert(old_ent->deleted == FALSE);

                /* Insert the old entry into the temporary list, but do not
                 * evict (yet).  Make sure we do not make any calls to the index
                 * until all chunks have updated indices! */
                HDassert(!old_ent->tmp_next);
                HDassert(!old_ent->tmp_prev);
                tmp_tail->tmp_next = old_ent;
                old_ent->tmp_prev  = tmp_tail;
                tmp_tail           = old_ent;
            } /* end if */

            /* Insert this chunk into correct location in hash table */
            rdcc->slot[ent->idx] = ent;

            /* If this chunk was previously on the temporary list and therefore
             * not in the hash table, remove it from the temporary list.
             * Otherwise clear the old hash table slot. */
            if (ent->tmp_prev) {
                HDassert(tmp_head.tmp_next);
                HDassert(tmp_tail != &tmp_head);
                ent->tmp_prev->tmp_next = ent->tmp_next;
                if (ent->tmp_next) {
                    ent->tmp_next->tmp_prev = ent->tmp_prev;
                    ent->tmp_next           = NULL;
                } /* end if */
                else {
                    HDassert(tmp_tail == ent);
                    tmp_tail = ent->tmp_prev;
                } /* end else */
                ent->tmp_prev = NULL;
            } /* end if */
            else
                rdcc->slot[old_idx] = NULL;
        } /* end if */
    }     /* end for */

    /* tmp_tail is no longer needed, and will be invalidated by
     * H5D_chunk_cache_evict anyways. */
    tmp_tail = NULL;

    /* Evict chunks that are still on the temporary list */
    while (tmp_head.tmp_next) {
        ent = tmp_head.tmp_next;

        /* Remove the old entry from the cache */
        if (H5D__chunk_cache_evict(dset, ent, TRUE) < 0)
            HGOTO_ERROR(H5E_IO, H5E_CANTFLUSH, FAIL, "unable to flush one or more raw data chunks")
    } /* end while */

done:
    /* Remove temporary list from rdcc */
    rdcc->tmp_head = NULL;

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_update_cache() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_copy_cb
 *
 * Purpose:     Copy chunked raw data from source file and insert to the
 *              index in the destination file
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Peter Cao
 *              August 20, 2005
 *
 *-------------------------------------------------------------------------
 */
static int
H5D__chunk_copy_cb(const H5D_chunk_rec_t *chunk_rec, void *_udata)
{
    H5D_chunk_it_ud3_t *udata = (H5D_chunk_it_ud3_t *)_udata; /* User data for callback */
    H5D_chunk_ud_t      udata_dst;                            /* User data about new destination chunk */
    hbool_t             is_vlen     = FALSE;                  /* Whether datatype is variable-length */
    hbool_t             fix_ref     = FALSE; /* Whether to fix up references in the dest. file */
    hbool_t             need_insert = FALSE; /* Whether the chunk needs to be inserted into the index */

    /* General information about chunk copy */
    void *             bkg      = udata->bkg;      /* Background buffer for datatype conversion */
    void *             buf      = udata->buf;      /* Chunk buffer for I/O & datatype conversions */
    size_t             buf_size = udata->buf_size; /* Size of chunk buffer */
    const H5O_pline_t *pline    = udata->pline;    /* I/O pipeline for applying filters */

    /* needed for compressed variable length data */
    hbool_t  must_filter = FALSE;      /* Whether chunk must be filtered during copy */
    size_t   nbytes;                   /* Size of chunk in file (in bytes) */
    H5Z_cb_t filter_cb;                /* Filter failure callback struct */
    int      ret_value = H5_ITER_CONT; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Get 'size_t' local value for number of bytes in chunk */
    H5_CHECKED_ASSIGN(nbytes, size_t, chunk_rec->nbytes, uint32_t);

    /* Initialize the filter callback struct */
    filter_cb.op_data = NULL;
    filter_cb.func    = NULL; /* no callback function when failed */

    /* Check for filtered chunks */
    /* Check for an edge chunk that is not filtered */
    if (pline && pline->nused) {
        must_filter = TRUE;
        if ((udata->common.layout->flags & H5O_LAYOUT_CHUNK_DONT_FILTER_PARTIAL_BOUND_CHUNKS) &&
            H5D__chunk_is_partial_edge_chunk(udata->dset_ndims, udata->common.layout->dim, chunk_rec->scaled,
                                             udata->dset_dims))
            must_filter = FALSE;
    }

    /* Check parameter for type conversion */
    if (udata->do_convert) {
        if (H5T_detect_class(udata->dt_src, H5T_VLEN, FALSE) > 0)
            is_vlen = TRUE;
        else if ((H5T_get_class(udata->dt_src, FALSE) == H5T_REFERENCE) &&
                 (udata->file_src != udata->idx_info_dst->f))
            fix_ref = TRUE;
        else
            HGOTO_ERROR(H5E_DATASET, H5E_CANTCOPY, H5_ITER_ERROR, "unable to copy dataset elements")
    } /* end if */

    /* Resize the buf if it is too small to hold the data */
    if (nbytes > buf_size) {
        void *new_buf; /* New buffer for data */

        /* Re-allocate memory for copying the chunk */
        if (NULL == (new_buf = H5MM_realloc(udata->buf, nbytes)))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, H5_ITER_ERROR,
                        "memory allocation failed for raw data chunk")
        udata->buf = new_buf;
        if (udata->bkg) {
            if (NULL == (new_buf = H5MM_realloc(udata->bkg, nbytes)))
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, H5_ITER_ERROR,
                            "memory allocation failed for raw data chunk")
            udata->bkg = new_buf;
            if (!udata->cpy_info->expand_ref)
                HDmemset((uint8_t *)udata->bkg + buf_size, 0, (size_t)(nbytes - buf_size));

            bkg = udata->bkg;
        } /* end if */

        buf             = udata->buf;
        udata->buf_size = buf_size = nbytes;
    } /* end if */

    if (udata->chunk_in_cache && udata->chunk) {
        HDassert(!H5F_addr_defined(chunk_rec->chunk_addr));
        H5MM_memcpy(buf, udata->chunk, nbytes);
        udata->chunk = NULL;
    }
    else {
        H5D_rdcc_ent_t *ent = NULL; /* Cache entry */
        unsigned        idx;        /* Index of chunk in cache, if present */
        unsigned        u;          /* Counter */
        H5D_shared_t *  shared_fo = (H5D_shared_t *)udata->cpy_info->shared_fo;

        /* See if the written chunk is in the chunk cache */
        if (shared_fo && shared_fo->cache.chunk.nslots > 0) {
            /* Determine the chunk's location in the hash table */
            idx = H5D__chunk_hash_val(shared_fo, chunk_rec->scaled);

            /* Get the chunk cache entry for that location */
            ent = shared_fo->cache.chunk.slot[idx];
            if (ent) {
                /* Speculatively set the 'found' flag */
                udata->chunk_in_cache = TRUE;

                /* Verify that the cache entry is the correct chunk */
                for (u = 0; u < shared_fo->ndims; u++)
                    if (chunk_rec->scaled[u] != ent->scaled[u]) {
                        udata->chunk_in_cache = FALSE;
                        break;
                    } /* end if */
            }         /* end if */
        }             /* end if */

        if (udata->chunk_in_cache) {
            HDassert(H5F_addr_defined(chunk_rec->chunk_addr));
            HDassert(ent);
            HDassert(H5F_addr_defined(ent->chunk_block.offset));

            H5_CHECKED_ASSIGN(nbytes, size_t, shared_fo->layout.u.chunk.size, uint32_t);
            H5MM_memcpy(buf, ent->chunk, nbytes);
        }
        else {
            /* read chunk data from the source file */
            if (H5F_block_read(udata->file_src, H5FD_MEM_DRAW, chunk_rec->chunk_addr, nbytes, buf) < 0)
                HGOTO_ERROR(H5E_IO, H5E_READERROR, H5_ITER_ERROR, "unable to read raw data chunk")
        }
    }

    /* Need to uncompress filtered variable-length & reference data elements that are not found in chunk cache
     */
    if (must_filter && (is_vlen || fix_ref) && !udata->chunk_in_cache) {
        unsigned filter_mask = chunk_rec->filter_mask;

        if (H5Z_pipeline(pline, H5Z_FLAG_REVERSE, &filter_mask, H5Z_NO_EDC, filter_cb, &nbytes, &buf_size,
                         &buf) < 0)
            HGOTO_ERROR(H5E_PLINE, H5E_CANTFILTER, H5_ITER_ERROR, "data pipeline read failed")
    } /* end if */

    /* Perform datatype conversion, if necessary */
    if (is_vlen) {
        H5T_path_t *tpath_src_mem    = udata->tpath_src_mem;
        H5T_path_t *tpath_mem_dst    = udata->tpath_mem_dst;
        H5S_t *     buf_space        = udata->buf_space;
        hid_t       tid_src          = udata->tid_src;
        hid_t       tid_dst          = udata->tid_dst;
        hid_t       tid_mem          = udata->tid_mem;
        void *      reclaim_buf      = udata->reclaim_buf;
        size_t      reclaim_buf_size = udata->reclaim_buf_size;

        /* Convert from source file to memory */
        H5_CHECK_OVERFLOW(udata->nelmts, uint32_t, size_t);
        if (H5T_convert(tpath_src_mem, tid_src, tid_mem, (size_t)udata->nelmts, (size_t)0, (size_t)0, buf,
                        bkg) < 0)
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, H5_ITER_ERROR, "datatype conversion failed")

        /* Copy into another buffer, to reclaim memory later */
        H5MM_memcpy(reclaim_buf, buf, reclaim_buf_size);

        /* Set background buffer to all zeros */
        HDmemset(bkg, 0, buf_size);

        /* Convert from memory to destination file */
        if (H5T_convert(tpath_mem_dst, tid_mem, tid_dst, udata->nelmts, (size_t)0, (size_t)0, buf, bkg) < 0)
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, H5_ITER_ERROR, "datatype conversion failed")

        /* Reclaim space from variable length data */
        if (H5T_reclaim(tid_mem, buf_space, reclaim_buf) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_BADITER, H5_ITER_ERROR, "unable to reclaim variable-length data")
    } /* end if */
    else if (fix_ref) {
        /* Check for expanding references */
        /* (background buffer has already been zeroed out, if not expanding) */
        if (udata->cpy_info->expand_ref) {
            /* Copy the reference elements */
            if (H5O_copy_expand_ref(udata->file_src, udata->tid_src, udata->dt_src, buf, nbytes,
                                    udata->idx_info_dst->f, bkg, udata->cpy_info) < 0)
                HGOTO_ERROR(H5E_DATASET, H5E_CANTCOPY, H5_ITER_ERROR, "unable to copy reference attribute")
        } /* end if */

        /* After fix ref, copy the new reference elements to the buffer to write out */
        H5MM_memcpy(buf, bkg, buf_size);
    } /* end if */

    /* Set up destination chunk callback information for insertion */
    udata_dst.common.layout      = udata->idx_info_dst->layout;
    udata_dst.common.storage     = udata->idx_info_dst->storage;
    udata_dst.common.scaled      = chunk_rec->scaled;
    udata_dst.chunk_block.offset = HADDR_UNDEF;
    udata_dst.chunk_block.length = chunk_rec->nbytes;
    udata_dst.filter_mask        = chunk_rec->filter_mask;

    /* Need to compress variable-length or reference data elements or a chunk found in cache before writing to
     * file */
    if (must_filter && (is_vlen || fix_ref || udata->chunk_in_cache)) {
        if (H5Z_pipeline(pline, 0, &(udata_dst.filter_mask), H5Z_NO_EDC, filter_cb, &nbytes, &buf_size,
                         &buf) < 0)
            HGOTO_ERROR(H5E_PLINE, H5E_CANTFILTER, H5_ITER_ERROR, "output pipeline failed")
#if H5_SIZEOF_SIZE_T > 4
        /* Check for the chunk expanding too much to encode in a 32-bit value */
        if (nbytes > ((size_t)0xffffffff))
            HGOTO_ERROR(H5E_DATASET, H5E_BADRANGE, H5_ITER_ERROR, "chunk too large for 32-bit length")
#endif /* H5_SIZEOF_SIZE_T > 4 */
        H5_CHECKED_ASSIGN(udata_dst.chunk_block.length, uint32_t, nbytes, size_t);
        udata->buf      = buf;
        udata->buf_size = buf_size;
    } /* end if */

    udata->chunk_in_cache = FALSE;

    udata_dst.chunk_idx =
        H5VM_array_offset_pre(udata_dst.common.layout->ndims - 1, udata_dst.common.layout->max_down_chunks,
                              udata_dst.common.scaled);

    /* Allocate chunk in the file */
    if (H5D__chunk_file_alloc(udata->idx_info_dst, NULL, &udata_dst.chunk_block, &need_insert,
                              udata_dst.common.scaled) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINSERT, FAIL, "unable to insert/resize chunk on chunk level")

    /* Write chunk data to destination file */
    HDassert(H5F_addr_defined(udata_dst.chunk_block.offset));
    if (H5F_block_write(udata->idx_info_dst->f, H5FD_MEM_DRAW, udata_dst.chunk_block.offset, nbytes, buf) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_WRITEERROR, H5_ITER_ERROR, "unable to write raw data to file")

    /* Set metadata tag in API context */
    H5_BEGIN_TAG(H5AC__COPIED_TAG);

    /* Insert chunk record into index */
    if (need_insert && udata->idx_info_dst->storage->ops->insert)
        if ((udata->idx_info_dst->storage->ops->insert)(udata->idx_info_dst, &udata_dst, NULL) < 0)
            HGOTO_ERROR_TAG(H5E_DATASET, H5E_CANTINSERT, H5_ITER_ERROR,
                            "unable to insert chunk addr into index")

    /* Reset metadata tag in API context */
    H5_END_TAG

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_copy_cb() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_copy
 *
 * Purpose:    Copy chunked storage from SRC file to DST file.
 *
 * Return:    Success:    Non-negative
 *        Failure:    negative
 *
 * Programmer:  Peter Cao
 *            August 20, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_copy(H5F_t *f_src, H5O_storage_chunk_t *storage_src, H5O_layout_chunk_t *layout_src, H5F_t *f_dst,
                H5O_storage_chunk_t *storage_dst, const H5S_extent_t *ds_extent_src, const H5T_t *dt_src,
                const H5O_pline_t *pline_src, H5O_copy_t *cpy_info)
{
    H5D_chunk_it_ud3_t udata;                                       /* User data for iteration callback */
    H5D_chk_idx_info_t idx_info_dst;                                /* Dest. chunked index info */
    H5D_chk_idx_info_t idx_info_src;                                /* Source chunked index info */
    int                sndims;                                      /* Rank of dataspace */
    hsize_t            curr_dims[H5O_LAYOUT_NDIMS];                 /* Curr. size of dataset dimensions */
    hsize_t            max_dims[H5O_LAYOUT_NDIMS];                  /* Curr. size of dataset dimensions */
    H5O_pline_t        _pline;                                      /* Temporary pipeline info */
    const H5O_pline_t *pline;                                       /* Pointer to pipeline info to use */
    H5T_path_t *       tpath_src_mem = NULL, *tpath_mem_dst = NULL; /* Datatype conversion paths */
    hid_t              tid_src = -1;                                /* Datatype ID for source datatype */
    hid_t              tid_dst = -1;                                /* Datatype ID for destination datatype */
    hid_t              tid_mem = -1;                                /* Datatype ID for memory datatype */
    size_t             buf_size;                                    /* Size of copy buffer */
    size_t             reclaim_buf_size;                            /* Size of reclaim buffer */
    void *             buf             = NULL;                      /* Buffer for copying data */
    void *             bkg             = NULL;    /* Buffer for background during type conversion */
    void *             reclaim_buf     = NULL;    /* Buffer for reclaiming data */
    H5S_t *            buf_space       = NULL;    /* Dataspace describing buffer */
    hid_t              sid_buf         = -1;      /* ID for buffer dataspace */
    uint32_t           nelmts          = 0;       /* Number of elements in buffer */
    hbool_t            do_convert      = FALSE;   /* Indicate that type conversions should be performed */
    hbool_t            copy_setup_done = FALSE;   /* Indicate that 'copy setup' is done */
    herr_t             ret_value       = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Check args */
    HDassert(f_src);
    HDassert(storage_src);
    H5D_CHUNK_STORAGE_INDEX_CHK(storage_src);
    HDassert(layout_src);
    HDassert(f_dst);
    HDassert(storage_dst);
    H5D_CHUNK_STORAGE_INDEX_CHK(storage_dst);
    HDassert(ds_extent_src);
    HDassert(dt_src);

    /* Initialize the temporary pipeline info */
    if (NULL == pline_src) {
        HDmemset(&_pline, 0, sizeof(_pline));
        pline = &_pline;
    } /* end if */
    else
        pline = pline_src;

    /* Layout is not created in the destination file, reset index address */
    if (H5D_chunk_idx_reset(storage_dst, TRUE) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to reset chunked storage index in dest")

    /* Initialize layout information */
    {
        unsigned ndims; /* Rank of dataspace */

        /* Get the dim info for dataset */
        if ((sndims = H5S_extent_get_dims(ds_extent_src, curr_dims, max_dims)) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get dataspace dimensions")
        H5_CHECKED_ASSIGN(ndims, unsigned, sndims, int);

        /* Set the source layout chunk information */
        if (H5D__chunk_set_info_real(layout_src, ndims, curr_dims, max_dims) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "can't set layout's chunk info")
    } /* end block */

    /* Compose source & dest chunked index info structs */
    idx_info_src.f       = f_src;
    idx_info_src.pline   = pline;
    idx_info_src.layout  = layout_src;
    idx_info_src.storage = storage_src;

    idx_info_dst.f       = f_dst;
    idx_info_dst.pline   = pline; /* Use same I/O filter pipeline for dest. */
    idx_info_dst.layout  = layout_src /* Use same layout for dest. */;
    idx_info_dst.storage = storage_dst;

    /* Call the index-specific "copy setup" routine */
    if ((storage_src->ops->copy_setup)(&idx_info_src, &idx_info_dst) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL,
                    "unable to set up index-specific chunk copying information")
    copy_setup_done = TRUE;

    /* Create datatype ID for src datatype */
    if ((tid_src = H5I_register(H5I_DATATYPE, dt_src, FALSE)) < 0)
        HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL, "unable to register source file datatype")

    /* If there's a VLEN source datatype, set up type conversion information */
    if (H5T_detect_class(dt_src, H5T_VLEN, FALSE) > 0) {
        H5T_t *  dt_dst;      /* Destination datatype */
        H5T_t *  dt_mem;      /* Memory datatype */
        size_t   mem_dt_size; /* Memory datatype size */
        size_t   tmp_dt_size; /* Temp. datatype size */
        size_t   max_dt_size; /* Max atatype size */
        hsize_t  buf_dim;     /* Dimension for buffer */
        unsigned u;

        /* create a memory copy of the variable-length datatype */
        if (NULL == (dt_mem = H5T_copy(dt_src, H5T_COPY_TRANSIENT)))
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to copy")
        if ((tid_mem = H5I_register(H5I_DATATYPE, dt_mem, FALSE)) < 0) {
            (void)H5T_close_real(dt_mem);
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL, "unable to register memory datatype")
        } /* end if */

        /* create variable-length datatype at the destinaton file */
        if (NULL == (dt_dst = H5T_copy(dt_src, H5T_COPY_TRANSIENT)))
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to copy")
        if (H5T_set_loc(dt_dst, H5F_VOL_OBJ(f_dst), H5T_LOC_DISK) < 0) {
            (void)H5T_close_real(dt_dst);
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "cannot mark datatype on disk")
        } /* end if */
        if ((tid_dst = H5I_register(H5I_DATATYPE, dt_dst, FALSE)) < 0) {
            (void)H5T_close_real(dt_dst);
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL, "unable to register destination file datatype")
        } /* end if */

        /* Set up the conversion functions */
        if (NULL == (tpath_src_mem = H5T_path_find(dt_src, dt_mem)))
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to convert between src and mem datatypes")
        if (NULL == (tpath_mem_dst = H5T_path_find(dt_mem, dt_dst)))
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to convert between mem and dst datatypes")

        /* Determine largest datatype size */
        if (0 == (max_dt_size = H5T_get_size(dt_src)))
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to determine datatype size")
        if (0 == (mem_dt_size = H5T_get_size(dt_mem)))
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to determine datatype size")
        max_dt_size = MAX(max_dt_size, mem_dt_size);
        if (0 == (tmp_dt_size = H5T_get_size(dt_dst)))
            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to determine datatype size")
        max_dt_size = MAX(max_dt_size, tmp_dt_size);

        /* Compute the number of elements per chunk */
        nelmts = 1;
        for (u = 0; u < (layout_src->ndims - 1); u++)
            nelmts *= layout_src->dim[u];

        /* Create the space and set the initial extent */
        buf_dim = nelmts;
        if (NULL == (buf_space = H5S_create_simple((unsigned)1, &buf_dim, NULL)))
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCREATE, FAIL, "can't create simple dataspace")

        /* Register */
        if ((sid_buf = H5I_register(H5I_DATASPACE, buf_space, FALSE)) < 0) {
            (void)H5S_close(buf_space);
            HGOTO_ERROR(H5E_ID, H5E_CANTREGISTER, FAIL, "unable to register dataspace ID")
        } /* end if */

        /* Set initial buffer sizes */
        buf_size         = nelmts * max_dt_size;
        reclaim_buf_size = nelmts * mem_dt_size;

        /* Allocate memory for reclaim buf */
        if (NULL == (reclaim_buf = H5MM_malloc(reclaim_buf_size)))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for raw data chunk")

        /* Indicate that type conversion should be performed */
        do_convert = TRUE;
    } /* end if */
    else {
        if (H5T_get_class(dt_src, FALSE) == H5T_REFERENCE) {
            /* Indicate that type conversion should be performed */
            do_convert = TRUE;
        } /* end if */

        H5_CHECKED_ASSIGN(buf_size, size_t, layout_src->size, uint32_t);
        reclaim_buf_size = 0;
    } /* end else */

    /* Set up conversion buffer, if appropriate */
    if (do_convert) {
        /* Allocate background memory for converting the chunk */
        if (NULL == (bkg = H5MM_malloc(buf_size)))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for raw data chunk")

        /* Check for reference datatype and no expanding references & clear background buffer */
        if (!cpy_info->expand_ref && ((H5T_get_class(dt_src, FALSE) == H5T_REFERENCE) && (f_src != f_dst)))
            /* Reset value to zero */
            HDmemset(bkg, 0, buf_size);
    } /* end if */

    /* Allocate memory for copying the chunk */
    if (NULL == (buf = H5MM_malloc(buf_size)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for raw data chunk")

    /* Initialize the callback structure for the source */
    HDmemset(&udata, 0, sizeof udata);
    udata.common.layout    = layout_src;
    udata.common.storage   = storage_src;
    udata.file_src         = f_src;
    udata.idx_info_dst     = &idx_info_dst;
    udata.buf              = buf;
    udata.bkg              = bkg;
    udata.buf_size         = buf_size;
    udata.tid_src          = tid_src;
    udata.tid_mem          = tid_mem;
    udata.tid_dst          = tid_dst;
    udata.dt_src           = dt_src;
    udata.do_convert       = do_convert;
    udata.tpath_src_mem    = tpath_src_mem;
    udata.tpath_mem_dst    = tpath_mem_dst;
    udata.reclaim_buf      = reclaim_buf;
    udata.reclaim_buf_size = reclaim_buf_size;
    udata.buf_space        = buf_space;
    udata.nelmts           = nelmts;
    udata.pline            = pline;
    udata.dset_ndims       = (unsigned)sndims;
    udata.dset_dims        = curr_dims;
    udata.cpy_info         = cpy_info;
    udata.chunk_in_cache   = FALSE;
    udata.chunk            = NULL;

    /* Iterate over chunks to copy data */
    if ((storage_src->ops->iterate)(&idx_info_src, H5D__chunk_copy_cb, &udata) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_BADITER, FAIL, "unable to iterate over chunk index to copy data")

    /* Iterate over the chunk cache to copy data for chunks with undefined address */
    if (udata.cpy_info->shared_fo) {
        H5D_rdcc_ent_t *ent, *next;
        H5D_chunk_rec_t chunk_rec;
        H5D_shared_t *  shared_fo = (H5D_shared_t *)udata.cpy_info->shared_fo;

        chunk_rec.nbytes      = layout_src->size;
        chunk_rec.filter_mask = 0;
        chunk_rec.chunk_addr  = HADDR_UNDEF;

        for (ent = shared_fo->cache.chunk.head; ent; ent = next) {
            if (!H5F_addr_defined(ent->chunk_block.offset)) {
                H5MM_memcpy(chunk_rec.scaled, ent->scaled, sizeof(chunk_rec.scaled));
                udata.chunk          = ent->chunk;
                udata.chunk_in_cache = TRUE;
                if (H5D__chunk_copy_cb(&chunk_rec, &udata) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTCOPY, FAIL, "unable to copy chunk data in cache")
            }
            next = ent->next;
        } /* end for */
    }

    /* I/O buffers may have been re-allocated */
    buf = udata.buf;
    bkg = udata.bkg;

done:
    if (sid_buf > 0 && H5I_dec_ref(sid_buf) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "can't decrement temporary dataspace ID")
    if (tid_src > 0 && H5I_dec_ref(tid_src) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "Can't decrement temporary datatype ID")
    if (tid_dst > 0 && H5I_dec_ref(tid_dst) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "Can't decrement temporary datatype ID")
    if (tid_mem > 0 && H5I_dec_ref(tid_mem) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "Can't decrement temporary datatype ID")
    if (buf)
        H5MM_xfree(buf);
    if (bkg)
        H5MM_xfree(bkg);
    if (reclaim_buf)
        H5MM_xfree(reclaim_buf);

    /* Clean up any index information */
    if (copy_setup_done)
        if (storage_src->ops->copy_shutdown &&
            (storage_src->ops->copy_shutdown)(storage_src, storage_dst) < 0)
            HDONE_ERROR(H5E_DATASET, H5E_CANTRELEASE, FAIL, "unable to shut down index copying info")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_copy() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_bh_info
 *
 * Purpose:     Retrieve the amount of index storage for chunked dataset
 *
 * Return:      Success:        Non-negative
 *              Failure:        negative
 *
 * Programmer:  Vailin Choi
 *              June 8, 2007
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_bh_info(const H5O_loc_t *loc, H5O_t *oh, H5O_layout_t *layout, hsize_t *index_size)
{
    H5D_chk_idx_info_t   idx_info;     /* Chunked index info */
    H5S_t *              space = NULL; /* Dataset's dataspace */
    H5O_pline_t          pline;        /* I/O pipeline message */
    H5O_storage_chunk_t *sc = &(layout->storage.u.chunk);
    htri_t               exists;                  /* Flag if header message of interest exists */
    hbool_t              idx_info_init = FALSE;   /* Whether the chunk index info has been initialized */
    hbool_t              pline_read    = FALSE;   /* Whether the I/O pipeline message was read */
    herr_t               ret_value     = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Check args */
    HDassert(loc);
    HDassert(loc->file);
    HDassert(H5F_addr_defined(loc->addr));
    HDassert(layout);
    H5D_CHUNK_STORAGE_INDEX_CHK(sc);
    HDassert(index_size);

    /* Check for I/O pipeline message */
    if ((exists = H5O_msg_exists_oh(oh, H5O_PLINE_ID)) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to read object header")
    else if (exists) {
        if (NULL == H5O_msg_read_oh(loc->file, oh, H5O_PLINE_ID, &pline))
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't find I/O pipeline message")
        pline_read = TRUE;
    } /* end else if */
    else
        HDmemset(&pline, 0, sizeof(pline));

    /* Compose chunked index info struct */
    idx_info.f       = loc->file;
    idx_info.pline   = &pline;
    idx_info.layout  = &layout->u.chunk;
    idx_info.storage = sc;

    /* Get the dataspace for the dataset */
    if (NULL == (space = H5S_read(loc)))
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to load dataspace info from dataset header")

    /* Allocate any indexing structures */
    if (sc->ops->init && (sc->ops->init)(&idx_info, space, loc->addr) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't initialize indexing information")
    idx_info_init = TRUE;

    /* Get size of index structure */
    if (sc->ops->size && (sc->ops->size)(&idx_info, index_size) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "unable to retrieve chunk index info")

done:
    /* Free resources, if they've been initialized */
    if (idx_info_init && sc->ops->dest && (sc->ops->dest)(&idx_info) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "unable to release chunk index info")
    if (pline_read && H5O_msg_reset(H5O_PLINE_ID, &pline) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CANTRESET, FAIL, "unable to reset I/O pipeline message")
    if (space && H5S_close(space) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CLOSEERROR, FAIL, "unable to release dataspace")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_bh_info() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_dump_index_cb
 *
 * Purpose:    If the UDATA.STREAM member is non-null then debugging
 *              information is written to that stream.
 *
 * Return:    Success:    Non-negative
 *
 *        Failure:    Negative
 *
 * Programmer:    Robb Matzke
 *              Wednesday, April 21, 1999
 *
 *-------------------------------------------------------------------------
 */
static int
H5D__chunk_dump_index_cb(const H5D_chunk_rec_t *chunk_rec, void *_udata)
{
    H5D_chunk_it_ud4_t *udata = (H5D_chunk_it_ud4_t *)_udata; /* User data from caller */

    FUNC_ENTER_PACKAGE_NOERR

    if (udata->stream) {
        unsigned u; /* Local index variable */

        /* Print header if not already displayed */
        if (!udata->header_displayed) {
            HDfprintf(udata->stream, "           Flags    Bytes     Address          Logical Offset\n");
            HDfprintf(udata->stream,
                      "        ========== ======== ========== ==============================\n");

            /* Set flag that the headers has been printed */
            udata->header_displayed = TRUE;
        } /* end if */

        /* Print information about this chunk */
        HDfprintf(udata->stream, "        0x%08x %8" PRIu32 " %10" PRIuHADDR " [", chunk_rec->filter_mask,
                  chunk_rec->nbytes, chunk_rec->chunk_addr);
        for (u = 0; u < udata->ndims; u++)
            HDfprintf(udata->stream, "%s%" PRIuHSIZE, (u ? ", " : ""),
                      (chunk_rec->scaled[u] * udata->chunk_dim[u]));
        HDfputs("]\n", udata->stream);
    } /* end if */

    FUNC_LEAVE_NOAPI(H5_ITER_CONT)
} /* H5D__chunk_dump_index_cb() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_dump_index
 *
 * Purpose:    Prints information about the storage index to the specified
 *        stream.
 *
 * Return:    Success:    Non-negative
 *        Failure:    negative
 *
 * Programmer:    Robb Matzke
 *              Wednesday, April 28, 1999
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_dump_index(H5D_t *dset, FILE *stream)
{
    H5O_storage_chunk_t *sc        = &(dset->shared->layout.storage.u.chunk);
    herr_t               ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    HDassert(dset);
    H5D_CHUNK_STORAGE_INDEX_CHK(sc);

    /* Only display info if stream is defined */
    if (stream) {
        H5D_chk_idx_info_t idx_info; /* Chunked index info */
        H5D_chunk_it_ud4_t udata;    /* User data for callback */

        /* Display info for index */
        if ((sc->ops->dump)(sc, stream) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_UNSUPPORTED, FAIL, "unable to dump chunk index info")

        /* Compose chunked index info struct */
        idx_info.f       = dset->oloc.file;
        idx_info.pline   = &dset->shared->dcpl_cache.pline;
        idx_info.layout  = &dset->shared->layout.u.chunk;
        idx_info.storage = sc;

        /* Set up user data for callback */
        udata.stream           = stream;
        udata.header_displayed = FALSE;
        udata.ndims            = dset->shared->layout.u.chunk.ndims;
        udata.chunk_dim        = dset->shared->layout.u.chunk.dim;

        /* Iterate over index and dump chunk info */
        if ((sc->ops->iterate)(&idx_info, H5D__chunk_dump_index_cb, &udata) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_BADITER, FAIL,
                        "unable to iterate over chunk index to dump chunk info")
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_dump_index() */

#ifdef H5D_CHUNK_DEBUG

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_stats
 *
 * Purpose:    Print raw data cache statistics to the debug stream.  If
 *        HEADERS is non-zero then print table column headers,
 *        otherwise assume that the H5AC layer has already printed them.
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Robb Matzke
 *              Thursday, May 21, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_stats(const H5D_t *dset, hbool_t headers)
{
    H5D_rdcc_t *rdcc = &(dset->shared->cache.chunk);
    double      miss_rate;
    char        ascii[32];
    herr_t      ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE_NOERR

    if (!H5DEBUG(AC))
        HGOTO_DONE(SUCCEED)

    if (headers) {
        HDfprintf(H5DEBUG(AC), "H5D: raw data cache statistics\n");
        HDfprintf(H5DEBUG(AC), "   %-18s %8s %8s %8s %8s+%-8s\n", "Layer", "Hits", "Misses", "MissRate",
                  "Inits", "Flushes");
        HDfprintf(H5DEBUG(AC), "   %-18s %8s %8s %8s %8s-%-8s\n", "-----", "----", "------", "--------",
                  "-----", "-------");
    }

#ifdef H5AC_DEBUG
    if (H5DEBUG(AC))
        headers = TRUE;
#endif

    if (headers) {
        if (rdcc->stats.nhits > 0 || rdcc->stats.nmisses > 0) {
            miss_rate = 100.0 * rdcc->stats.nmisses / (rdcc->stats.nhits + rdcc->stats.nmisses);
        }
        else {
            miss_rate = 0.0;
        }
        if (miss_rate > 100) {
            HDsnprintf(ascii, sizeof(ascii), "%7d%%", (int)(miss_rate + 0.5));
        }
        else {
            HDsnprintf(ascii, sizeof(ascii), "%7.2f%%", miss_rate);
        }

        HDfprintf(H5DEBUG(AC), "   %-18s %8u %8u %7s %8d+%-9ld\n", "raw data chunks", rdcc->stats.nhits,
                  rdcc->stats.nmisses, ascii, rdcc->stats.ninits,
                  (long)(rdcc->stats.nflushes) - (long)(rdcc->stats.ninits));
    }

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_stats() */
#endif /* H5D_CHUNK_DEBUG */

/*-------------------------------------------------------------------------
 * Function:    H5D__nonexistent_readvv_cb
 *
 * Purpose:    Callback operation for performing fill value I/O operation
 *              on memory buffer.
 *
 * Note:    This algorithm is pretty inefficient about initializing and
 *              terminating the fill buffer info structure and it would be
 *              faster to refactor this into a "real" initialization routine,
 *              and a "vectorized fill" routine. -QAK
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Quincey Koziol
 *        30 Sep 2010
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D__nonexistent_readvv_cb(hsize_t H5_ATTR_UNUSED dst_off, hsize_t src_off, size_t len, void *_udata)
{
    H5D_chunk_readvv_ud_t *udata = (H5D_chunk_readvv_ud_t *)_udata; /* User data for H5VM_opvv() operator */
    H5D_fill_buf_info_t    fb_info;                                 /* Dataset's fill buffer info */
    hbool_t                fb_info_init = FALSE;   /* Whether the fill value buffer has been initialized */
    herr_t                 ret_value    = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Initialize the fill value buffer */
    if (H5D__fill_init(&fb_info, (udata->rbuf + src_off), NULL, NULL, NULL, NULL,
                       &udata->dset->shared->dcpl_cache.fill, udata->dset->shared->type,
                       udata->dset->shared->type_id, (size_t)0, len) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't initialize fill buffer info")
    fb_info_init = TRUE;

    /* Check for VL datatype & fill the buffer with VL datatype fill values */
    if (fb_info.has_vlen_fill_type && H5D__fill_refill_vl(&fb_info, fb_info.elmts_per_buf) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTCONVERT, FAIL, "can't refill fill value buffer")

done:
    /* Release the fill buffer info, if it's been initialized */
    if (fb_info_init && H5D__fill_term(&fb_info) < 0)
        HDONE_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "Can't release fill buffer info")

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D__nonexistent_readvv_cb() */

/*-------------------------------------------------------------------------
 * Function:    H5D__nonexistent_readvv
 *
 * Purpose:    When the chunk doesn't exist on disk and the chunk is bigger
 *              than the cache size, performs fill value I/O operation on
 *              memory buffer, advancing through two I/O vectors, until one
 *              runs out.
 *
 * Note:    This algorithm is pretty inefficient about initializing and
 *              terminating the fill buffer info structure and it would be
 *              faster to refactor this into a "real" initialization routine,
 *              and a "vectorized fill" routine. -QAK
 *
 * Return:    Non-negative on success/Negative on failure
 *
 * Programmer:    Raymond Lu
 *        6 Feb 2009
 *
 *-------------------------------------------------------------------------
 */
static ssize_t
H5D__nonexistent_readvv(const H5D_io_info_t *io_info, size_t chunk_max_nseq, size_t *chunk_curr_seq,
                        size_t chunk_len_arr[], hsize_t chunk_off_arr[], size_t mem_max_nseq,
                        size_t *mem_curr_seq, size_t mem_len_arr[], hsize_t mem_off_arr[])
{
    H5D_chunk_readvv_ud_t udata;          /* User data for H5VM_opvv() operator */
    ssize_t               ret_value = -1; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Check args */
    HDassert(io_info);
    HDassert(chunk_curr_seq);
    HDassert(chunk_len_arr);
    HDassert(chunk_off_arr);
    HDassert(mem_curr_seq);
    HDassert(mem_len_arr);
    HDassert(mem_off_arr);

    /* Set up user data for H5VM_opvv() */
    udata.rbuf = (unsigned char *)io_info->u.rbuf;
    udata.dset = io_info->dset;

    /* Call generic sequence operation routine */
    if ((ret_value = H5VM_opvv(chunk_max_nseq, chunk_curr_seq, chunk_len_arr, chunk_off_arr, mem_max_nseq,
                               mem_curr_seq, mem_len_arr, mem_off_arr, H5D__nonexistent_readvv_cb, &udata)) <
        0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTOPERATE, FAIL, "can't perform vectorized fill value init")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D__nonexistent_readvv() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_is_partial_edge_chunk
 *
 * Purpose:     Checks to see if the chunk is a partial edge chunk.
 *              Either dset or (dset_dims and dset_ndims) must be
 *              provided.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Neil Fortner
 *              19 Nov 2009
 *
 *-------------------------------------------------------------------------
 */
hbool_t
H5D__chunk_is_partial_edge_chunk(unsigned dset_ndims, const uint32_t *chunk_dims, const hsize_t scaled[],
                                 const hsize_t *dset_dims)
{
    unsigned u;                 /* Local index variable */
    hbool_t  ret_value = FALSE; /* Return value */

    FUNC_ENTER_PACKAGE_NOERR

    /* Check args */
    HDassert(scaled);
    HDassert(dset_ndims > 0);
    HDassert(dset_dims);
    HDassert(chunk_dims);

    /* check if this is a partial edge chunk */
    for (u = 0; u < dset_ndims; u++)
        if (((scaled[u] + 1) * chunk_dims[u]) > dset_dims[u])
            HGOTO_DONE(TRUE);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D__chunk_is_partial_edge_chunk() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_file_alloc()
 *
 * Purpose:     Chunk allocation:
 *          Create the chunk if it doesn't exist, or reallocate the
 *                chunk if its size changed.
 *          The coding is moved and modified from each index structure.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Vailin Choi; June 2014
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_file_alloc(const H5D_chk_idx_info_t *idx_info, const H5F_block_t *old_chunk,
                      H5F_block_t *new_chunk, hbool_t *need_insert, const hsize_t *scaled)
{
    hbool_t alloc_chunk = FALSE;   /* Whether to allocate chunk */
    herr_t  ret_value   = SUCCEED; /* Return value         */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    HDassert(idx_info);
    HDassert(idx_info->f);
    HDassert(idx_info->pline);
    HDassert(idx_info->layout);
    HDassert(idx_info->storage);
    HDassert(new_chunk);
    HDassert(need_insert);

    *need_insert = FALSE;

    /* Check for filters on chunks */
    if (idx_info->pline->nused > 0) {
        /* Sanity/error checking block */
        HDassert(idx_info->storage->idx_type != H5D_CHUNK_IDX_NONE);
        {
            unsigned allow_chunk_size_len; /* Allowed size of encoded chunk size */
            unsigned new_chunk_size_len;   /* Size of encoded chunk size */

            /* Compute the size required for encoding the size of a chunk, allowing
             * for an extra byte, in case the filter makes the chunk larger.
             */
            allow_chunk_size_len = 1 + ((H5VM_log2_gen((uint64_t)(idx_info->layout->size)) + 8) / 8);
            if (allow_chunk_size_len > 8)
                allow_chunk_size_len = 8;

            /* Compute encoded size of chunk */
            new_chunk_size_len = (H5VM_log2_gen((uint64_t)(new_chunk->length)) + 8) / 8;
            if (new_chunk_size_len > 8)
                HGOTO_ERROR(H5E_DATASET, H5E_BADRANGE, FAIL, "encoded chunk size is more than 8 bytes?!?")

            /* Check if the chunk became too large to be encoded */
            if (new_chunk_size_len > allow_chunk_size_len)
                HGOTO_ERROR(H5E_DATASET, H5E_BADRANGE, FAIL, "chunk size can't be encoded")
        } /* end block */

        if (old_chunk && H5F_addr_defined(old_chunk->offset)) {
            /* Sanity check */
            HDassert(!H5F_addr_defined(new_chunk->offset) ||
                     H5F_addr_eq(new_chunk->offset, old_chunk->offset));

            /* Check for chunk being same size */
            if (new_chunk->length != old_chunk->length) {
                /* Release previous chunk */
                /* Only free the old location if not doing SWMR writes - otherwise
                 * we must keep the old chunk around in case a reader has an
                 * outdated version of the B-tree node
                 */
                if (!(H5F_INTENT(idx_info->f) & H5F_ACC_SWMR_WRITE))
                    if (H5MF_xfree(idx_info->f, H5FD_MEM_DRAW, old_chunk->offset, old_chunk->length) < 0)
                        HGOTO_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "unable to free chunk")
                alloc_chunk = TRUE;
            } /* end if */
            else {
                /* Don't need to reallocate chunk, but send its address back up */
                if (!H5F_addr_defined(new_chunk->offset))
                    new_chunk->offset = old_chunk->offset;
            } /* end else */
        }     /* end if */
        else {
            HDassert(!H5F_addr_defined(new_chunk->offset));
            alloc_chunk = TRUE;
        } /* end else */
    }     /* end if */
    else {
        HDassert(!H5F_addr_defined(new_chunk->offset));
        HDassert(new_chunk->length == idx_info->layout->size);
        alloc_chunk = TRUE;
    } /* end else */

    /* Actually allocate space for the chunk in the file */
    if (alloc_chunk) {
        switch (idx_info->storage->idx_type) {
            case H5D_CHUNK_IDX_NONE: {
                H5D_chunk_ud_t udata;

                udata.common.scaled = scaled;
                if ((idx_info->storage->ops->get_addr)(idx_info, &udata) < 0)
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't query chunk address")
                new_chunk->offset = udata.chunk_block.offset;
                HDassert(new_chunk->length == udata.chunk_block.length);
                break;
            }

            case H5D_CHUNK_IDX_EARRAY:
            case H5D_CHUNK_IDX_FARRAY:
            case H5D_CHUNK_IDX_BT2:
            case H5D_CHUNK_IDX_BTREE:
            case H5D_CHUNK_IDX_SINGLE:
                HDassert(new_chunk->length > 0);
                H5_CHECK_OVERFLOW(new_chunk->length, /*From: */ uint32_t, /*To: */ hsize_t);
                new_chunk->offset = H5MF_alloc(idx_info->f, H5FD_MEM_DRAW, (hsize_t)new_chunk->length);
                if (!H5F_addr_defined(new_chunk->offset))
                    HGOTO_ERROR(H5E_DATASET, H5E_CANTALLOC, FAIL, "file allocation failed")
                *need_insert = TRUE;
                break;

            case H5D_CHUNK_IDX_NTYPES:
            default:
                HDassert(0 && "This should never be executed!");
                break;
        } /* end switch */
    }     /* end if */

    HDassert(H5F_addr_defined(new_chunk->offset));

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D__chunk_file_alloc() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_format_convert_cb
 *
 * Purpose:     Callback routine to insert chunk address into v1 B-tree
 *              chunk index.
 *
 * Return:      Success:        Non-negative
 *              Failure:        Negative
 *
 * Programmer:  Vailin Choi
 *              Feb 2015
 *
 *-------------------------------------------------------------------------
 */
static int
H5D__chunk_format_convert_cb(const H5D_chunk_rec_t *chunk_rec, void *_udata)
{
    H5D_chunk_it_ud5_t *udata = (H5D_chunk_it_ud5_t *)_udata; /* User data */
    H5D_chk_idx_info_t *new_idx_info;                         /* The new chunk index information */
    H5D_chunk_ud_t      insert_udata;                         /* Chunk information to be inserted */
    haddr_t             chunk_addr;                           /* Chunk address */
    size_t              nbytes;                               /* Chunk size */
    void *              buf       = NULL;                     /* Pointer to buffer of chunk data */
    int                 ret_value = H5_ITER_CONT;             /* Return value */

    FUNC_ENTER_PACKAGE

    /* Set up */
    new_idx_info = udata->new_idx_info;
    H5_CHECKED_ASSIGN(nbytes, size_t, chunk_rec->nbytes, uint32_t);
    chunk_addr = chunk_rec->chunk_addr;

    if (new_idx_info->pline->nused &&
        (new_idx_info->layout->flags & H5O_LAYOUT_CHUNK_DONT_FILTER_PARTIAL_BOUND_CHUNKS) &&
        (H5D__chunk_is_partial_edge_chunk(udata->dset_ndims, new_idx_info->layout->dim, chunk_rec->scaled,
                                          udata->dset_dims))) {

        /* This is a partial non-filtered edge chunk */
        /* Convert the chunk to a filtered edge chunk for v1 B-tree chunk index */

        unsigned filter_mask = chunk_rec->filter_mask;
        H5Z_cb_t filter_cb;          /* Filter failure callback struct */
        size_t   read_size = nbytes; /* Bytes to read */

        HDassert(read_size == new_idx_info->layout->size);

        /* Initialize the filter callback struct */
        filter_cb.op_data = NULL;
        filter_cb.func    = NULL; /* no callback function when failed */

        /* Allocate buffer for chunk data */
        if (NULL == (buf = H5MM_malloc(read_size)))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, H5_ITER_ERROR,
                        "memory allocation failed for raw data chunk")

        /* Read the non-filtered edge chunk */
        if (H5F_block_read(new_idx_info->f, H5FD_MEM_DRAW, chunk_addr, read_size, buf) < 0)
            HGOTO_ERROR(H5E_IO, H5E_READERROR, H5_ITER_ERROR, "unable to read raw data chunk")

        /* Pass the chunk through the pipeline */
        if (H5Z_pipeline(new_idx_info->pline, 0, &filter_mask, H5Z_NO_EDC, filter_cb, &nbytes, &read_size,
                         &buf) < 0)
            HGOTO_ERROR(H5E_PLINE, H5E_CANTFILTER, H5_ITER_ERROR, "output pipeline failed")

#if H5_SIZEOF_SIZE_T > 4
        /* Check for the chunk expanding too much to encode in a 32-bit value */
        if (nbytes > ((size_t)0xffffffff))
            HGOTO_ERROR(H5E_DATASET, H5E_BADRANGE, H5_ITER_ERROR, "chunk too large for 32-bit length")
#endif /* H5_SIZEOF_SIZE_T > 4 */

        /* Allocate space for the filtered chunk */
        if ((chunk_addr = H5MF_alloc(new_idx_info->f, H5FD_MEM_DRAW, (hsize_t)nbytes)) == HADDR_UNDEF)
            HGOTO_ERROR(H5E_DATASET, H5E_NOSPACE, H5_ITER_ERROR, "file allocation failed for filtered chunk")
        HDassert(H5F_addr_defined(chunk_addr));

        /* Write the filtered chunk to disk */
        if (H5F_block_write(new_idx_info->f, H5FD_MEM_DRAW, chunk_addr, nbytes, buf) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_WRITEERROR, H5_ITER_ERROR, "unable to write raw data to file")
    } /* end if */

    /* Set up chunk information for insertion to chunk index */
    insert_udata.chunk_block.offset = chunk_addr;
    insert_udata.chunk_block.length = nbytes;
    insert_udata.filter_mask        = chunk_rec->filter_mask;
    insert_udata.common.scaled      = chunk_rec->scaled;
    insert_udata.common.layout      = new_idx_info->layout;
    insert_udata.common.storage     = new_idx_info->storage;

    /* Insert chunk into the v1 B-tree chunk index */
    if ((new_idx_info->storage->ops->insert)(new_idx_info, &insert_udata, NULL) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTINSERT, H5_ITER_ERROR, "unable to insert chunk addr into index")

done:
    if (buf)
        H5MM_xfree(buf);

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D__chunk_format_convert_cb() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_format_convert
 *
 * Purpose:     Iterate over the chunks for the current chunk index and insert the
 *        the chunk addresses into v1 B-tree chunk index via callback.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Vailin Choi
 *              Feb 2015
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_format_convert(H5D_t *dset, H5D_chk_idx_info_t *idx_info, H5D_chk_idx_info_t *new_idx_info)
{
    H5D_chunk_it_ud5_t udata;               /* User data */
    herr_t             ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Check args */
    HDassert(dset);

    /* Set up user data */
    udata.new_idx_info = new_idx_info;
    udata.dset_ndims   = dset->shared->ndims;
    udata.dset_dims    = dset->shared->curr_dims;

    /* Iterate over the chunks in the current index and insert the chunk addresses into version 1 B-tree index
     */
    if ((idx_info->storage->ops->iterate)(idx_info, H5D__chunk_format_convert_cb, &udata) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_BADITER, FAIL, "unable to iterate over chunk index to chunk info")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_format_convert() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_index_empty_cb
 *
 * Purpose:     Callback function that simply stops iteration and sets the
 *              `empty` parameter to FALSE if called. If this callback is
 *              entered, it means that the chunk index contains at least
 *              one chunk, so is not empty.
 *
 * Return:      H5_ITER_STOP
 *
 *-------------------------------------------------------------------------
 */
static int
H5D__chunk_index_empty_cb(const H5D_chunk_rec_t H5_ATTR_UNUSED *chunk_rec, void *_udata)
{
    hbool_t *empty     = (hbool_t *)_udata;
    int      ret_value = H5_ITER_STOP;

    FUNC_ENTER_PACKAGE_NOERR

    *empty = FALSE;

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_index_empty_cb() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_index_empty
 *
 * Purpose:     Determines whether a chunk index is empty (has no chunks
 *              inserted into it yet).
 *
 * Note:        This routine is meant to be a little more performant than
 *              just counting the number of chunks in the index. In the
 *              future, this is probably a callback that the chunk index
 *              ops structure should provide.
 *
 * Return:      Non-negative on Success/Negative on failure
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_index_empty(const H5D_t *dset, hbool_t *empty)
{
    H5D_chk_idx_info_t idx_info;            /* Chunked index info */
    H5D_rdcc_ent_t *   ent;                 /* Cache entry  */
    const H5D_rdcc_t * rdcc      = NULL;    /* Raw data chunk cache */
    herr_t             ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE_TAG(dset->oloc.addr)

    HDassert(dset);
    HDassert(dset->shared);
    HDassert(empty);

    rdcc = &(dset->shared->cache.chunk); /* raw data chunk cache */
    HDassert(rdcc);

    /* Search for cached chunks that haven't been written out */
    for (ent = rdcc->head; ent; ent = ent->next)
        /* Flush the chunk out to disk, to make certain the size is correct later */
        if (H5D__chunk_flush_entry(dset, ent, FALSE) < 0)
            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "cannot flush indexed storage buffer")

    /* Compose chunked index info struct */
    idx_info.f       = dset->oloc.file;
    idx_info.pline   = &dset->shared->dcpl_cache.pline;
    idx_info.layout  = &dset->shared->layout.u.chunk;
    idx_info.storage = &dset->shared->layout.storage.u.chunk;

    *empty = TRUE;

    if (H5F_addr_defined(idx_info.storage->idx_addr)) {
        /* Iterate over the allocated chunks */
        if ((dset->shared->layout.storage.u.chunk.ops->iterate)(&idx_info, H5D__chunk_index_empty_cb, empty) <
            0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL,
                        "unable to retrieve allocated chunk information from index")
    }

done:
    FUNC_LEAVE_NOAPI_TAG(ret_value)
} /* end H5D__chunk_index_empty() */

/*-------------------------------------------------------------------------
 * Function:    H5D__get_num_chunks_cb
 *
 * Purpose:     Callback function that increments the number of written
 *              chunks in the dataset.
 *
 * Note:        Currently, this function only gets the number of all written
 *              chunks, regardless the dataspace.
 *
 * Return:      H5_ITER_CONT
 *
 * Programmer:  Binh-Minh Ribler
 *              June 2019 (HDFFV-10677)
 *
 *-------------------------------------------------------------------------
 */
static int
H5D__get_num_chunks_cb(const H5D_chunk_rec_t H5_ATTR_UNUSED *chunk_rec, void *_udata)
{
    hsize_t *num_chunks = (hsize_t *)_udata;
    int      ret_value  = H5_ITER_CONT; /* Callback return value */

    FUNC_ENTER_PACKAGE_NOERR

    HDassert(num_chunks);

    (*num_chunks)++;

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D__get_num_chunks_cb() */

/*-------------------------------------------------------------------------
 * Function:    H5D__get_num_chunks
 *
 * Purpose:     Gets the number of written chunks in a dataset.
 *
 * Note:        Currently, this function only gets the number of all written
 *              chunks, regardless the dataspace.
 *
 * Return:      Success:    Non-negative
 *              Failure:    Negative
 *
 * Programmer:  Binh-Minh Ribler
 *              June 2019 (HDFFV-10677)
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__get_num_chunks(const H5D_t *dset, const H5S_t H5_ATTR_UNUSED *space, hsize_t *nchunks)
{
    H5D_chk_idx_info_t idx_info;            /* Chunked index info */
    hsize_t            num_chunks = 0;      /* Number of written chunks */
    H5D_rdcc_ent_t *   ent;                 /* Cache entry  */
    const H5D_rdcc_t * rdcc      = NULL;    /* Raw data chunk cache */
    herr_t             ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE_TAG(dset->oloc.addr)

    HDassert(dset);
    HDassert(dset->shared);
    HDassert(space);
    HDassert(nchunks);

    rdcc = &(dset->shared->cache.chunk); /* raw data chunk cache */
    HDassert(rdcc);

    /* Search for cached chunks that haven't been written out */
    for (ent = rdcc->head; ent; ent = ent->next)
        /* Flush the chunk out to disk, to make certain the size is correct later */
        if (H5D__chunk_flush_entry(dset, ent, FALSE) < 0)
            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "cannot flush indexed storage buffer")

    /* Compose chunked index info struct */
    idx_info.f       = dset->oloc.file;
    idx_info.pline   = &dset->shared->dcpl_cache.pline;
    idx_info.layout  = &dset->shared->layout.u.chunk;
    idx_info.storage = &dset->shared->layout.storage.u.chunk;

    /* If the dataset is not written, number of chunks will be 0 */
    if (!H5F_addr_defined(idx_info.storage->idx_addr))
        *nchunks = 0;
    else {
        /* Iterate over the allocated chunks */
        if ((dset->shared->layout.storage.u.chunk.ops->iterate)(&idx_info, H5D__get_num_chunks_cb,
                                                                &num_chunks) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL,
                        "unable to retrieve allocated chunk information from index")
        *nchunks = num_chunks;
    }

done:
    FUNC_LEAVE_NOAPI_TAG(ret_value)
} /* end H5D__get_num_chunks() */

/*-------------------------------------------------------------------------
 * Function:    H5D__get_chunk_info_cb
 *
 * Purpose:     Get the chunk info of the queried chunk, given by its index.
 *
 * Return:      Success:    H5_ITER_CONT or H5_ITER_STOP
 *                          H5_ITER_STOP indicates the queried chunk is found
 *              Failure:    Negative (H5_ITER_ERROR)
 *
 * Programmer:  Binh-Minh Ribler
 *              June 2019 (HDFFV-10677)
 *
 *-------------------------------------------------------------------------
 */
static int
H5D__get_chunk_info_cb(const H5D_chunk_rec_t *chunk_rec, void *_udata)
{
    H5D_chunk_info_iter_ud_t *chunk_info = (H5D_chunk_info_iter_ud_t *)_udata;
    int                       ret_value  = H5_ITER_CONT; /* Callback return value */

    FUNC_ENTER_PACKAGE_NOERR

    /* Check args */
    HDassert(chunk_rec);
    HDassert(chunk_info);

    /* If this is the queried chunk, retrieve its info and stop iterating */
    if (chunk_info->curr_idx == chunk_info->chunk_idx) {
        hsize_t ii = 0; /* Dimension index */

        /* Copy info */
        chunk_info->filter_mask = chunk_rec->filter_mask;
        chunk_info->chunk_addr  = chunk_rec->chunk_addr;
        chunk_info->nbytes      = chunk_rec->nbytes;
        for (ii = 0; ii < chunk_info->ndims; ii++)
            chunk_info->scaled[ii] = chunk_rec->scaled[ii];
        chunk_info->found = TRUE;

        /* Stop iterating */
        ret_value = H5_ITER_STOP;
    }
    /* Go to the next chunk */
    else
        chunk_info->curr_idx++;

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D__get_chunk_info_cb() */

/*-------------------------------------------------------------------------
 * Function:    H5D__get_chunk_info
 *
 * Purpose:     Iterate over the chunks in the dataset to get the info
 *              of the desired chunk.
 *
 * Note:        Currently, the domain of the index in this function is of all
 *              the written chunks, regardless the dataspace.
 *
 * Return:      Success: SUCCEED
 *              Failure: FAIL
 *
 * Programmer:  Binh-Minh Ribler
 *              June 2019 (HDFFV-10677)
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__get_chunk_info(const H5D_t *dset, const H5S_t H5_ATTR_UNUSED *space, hsize_t chk_index, hsize_t *offset,
                    unsigned *filter_mask, haddr_t *addr, hsize_t *size)
{
    H5D_chk_idx_info_t       idx_info;            /* Chunked index info */
    H5D_chunk_info_iter_ud_t udata;               /* User data for callback */
    const H5D_rdcc_t *       rdcc = NULL;         /* Raw data chunk cache */
    H5D_rdcc_ent_t *         ent;                 /* Cache entry index */
    hsize_t                  ii        = 0;       /* Dimension index */
    herr_t                   ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE_TAG(dset->oloc.addr)

    HDassert(dset);
    HDassert(dset->shared);
    HDassert(space);

    /* Get the raw data chunk cache */
    rdcc = &(dset->shared->cache.chunk);
    HDassert(rdcc);

    /* Search for cached chunks that haven't been written out */
    for (ent = rdcc->head; ent; ent = ent->next)
        /* Flush the chunk out to disk, to make certain the size is correct later */
        if (H5D__chunk_flush_entry(dset, ent, FALSE) < 0)
            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "cannot flush indexed storage buffer")

    /* Compose chunked index info struct */
    idx_info.f       = dset->oloc.file;
    idx_info.pline   = &dset->shared->dcpl_cache.pline;
    idx_info.layout  = &dset->shared->layout.u.chunk;
    idx_info.storage = &dset->shared->layout.storage.u.chunk;

    /* Set addr & size for when dset is not written or queried chunk is not found */
    if (addr)
        *addr = HADDR_UNDEF;
    if (size)
        *size = 0;

    /* If the chunk is written, get its info, otherwise, return without error */
    if (H5F_addr_defined(idx_info.storage->idx_addr)) {
        /* Initialize before iteration */
        udata.chunk_idx   = chk_index;
        udata.curr_idx    = 0;
        udata.ndims       = dset->shared->ndims;
        udata.nbytes      = 0;
        udata.filter_mask = 0;
        udata.chunk_addr  = HADDR_UNDEF;
        udata.found       = FALSE;

        /* Iterate over the allocated chunks */
        if ((dset->shared->layout.storage.u.chunk.ops->iterate)(&idx_info, H5D__get_chunk_info_cb, &udata) <
            0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL,
                        "unable to retrieve allocated chunk information from index")

        /* Obtain requested info if the chunk is found */
        if (udata.found) {
            if (filter_mask)
                *filter_mask = udata.filter_mask;
            if (addr)
                *addr = udata.chunk_addr;
            if (size)
                *size = udata.nbytes;
            if (offset)
                for (ii = 0; ii < udata.ndims; ii++)
                    offset[ii] = udata.scaled[ii] * dset->shared->layout.u.chunk.dim[ii];
        } /* end if */
    }     /* end if H5F_addr_defined */

done:
    FUNC_LEAVE_NOAPI_TAG(ret_value)
} /* end H5D__get_chunk_info() */

/*-------------------------------------------------------------------------
 * Function:    H5D__get_chunk_info_by_coord_cb
 *
 * Purpose:     Get the chunk info of the desired chunk, given its offset
 *              coordinates.
 *
 * Return:      Success:    H5_ITER_CONT or H5_ITER_STOP
 *              Failure:    Negative (H5_ITER_ERROR)
 *
 * Programmer:  Binh-Minh Ribler
 *              June 2019 (HDFFV-10677)
 *
 *-------------------------------------------------------------------------
 */
static int
H5D__get_chunk_info_by_coord_cb(const H5D_chunk_rec_t *chunk_rec, void *_udata)
{
    H5D_chunk_info_iter_ud_t *chunk_info = (H5D_chunk_info_iter_ud_t *)_udata;
    hbool_t                   different  = FALSE;       /* TRUE when a scaled value pair mismatch */
    hsize_t                   ii;                       /* Local index value */
    int                       ret_value = H5_ITER_CONT; /* Callback return value */

    FUNC_ENTER_PACKAGE_NOERR

    /* Check args */
    HDassert(chunk_rec);
    HDassert(chunk_info);

    /* Going through the scaled, stop when a mismatch is found */
    for (ii = 0; ii < chunk_info->ndims && !different; ii++)
        if (chunk_info->scaled[ii] != chunk_rec->scaled[ii])
            different = TRUE;

    /* Same scaled coords means the chunk is found, copy the chunk info */
    if (!different) {
        chunk_info->nbytes      = chunk_rec->nbytes;
        chunk_info->filter_mask = chunk_rec->filter_mask;
        chunk_info->chunk_addr  = chunk_rec->chunk_addr;
        chunk_info->found       = TRUE;

        /* Stop iterating */
        ret_value = H5_ITER_STOP;
    }

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D__get_chunk_info_by_coord_cb() */

/*-------------------------------------------------------------------------
 * Function:    H5D__get_chunk_info_by_coord
 *
 * Purpose:     Iterate over the chunks in the dataset to get the info
 *              of the desired chunk, given by its offset coordinates.
 *
 * Return:      Success:        Non-negative
 *              Failure:        Negative
 *
 * Programmer:  Binh-Minh Ribler
 *              June 2019 (HDFFV-10677)
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__get_chunk_info_by_coord(const H5D_t *dset, const hsize_t *offset, unsigned *filter_mask, haddr_t *addr,
                             hsize_t *size)
{
    const H5O_layout_t *     layout = NULL;       /* Dataset layout */
    const H5D_rdcc_t *       rdcc   = NULL;       /* Raw data chunk cache */
    H5D_rdcc_ent_t *         ent;                 /* Cache entry index */
    H5D_chk_idx_info_t       idx_info;            /* Chunked index info */
    H5D_chunk_info_iter_ud_t udata;               /* User data for callback */
    herr_t                   ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE_TAG(dset->oloc.addr)

    /* Check args */
    HDassert(dset);
    HDassert(dset->shared);
    HDassert(offset);

    /* Get dataset layout and raw data chunk cache */
    layout = &(dset->shared->layout);
    rdcc   = &(dset->shared->cache.chunk);
    HDassert(layout);
    HDassert(rdcc);
    HDassert(H5D_CHUNKED == layout->type);

    /* Search for cached chunks that haven't been written out */
    for (ent = rdcc->head; ent; ent = ent->next)
        /* Flush the chunk out to disk, to make certain the size is correct later */
        if (H5D__chunk_flush_entry(dset, ent, FALSE) < 0)
            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "cannot flush indexed storage buffer")

    /* Set addr & size for when dset is not written or queried chunk is not found */
    if (addr)
        *addr = HADDR_UNDEF;
    if (size)
        *size = 0;

    /* Compose chunked index info struct */
    idx_info.f       = dset->oloc.file;
    idx_info.pline   = &dset->shared->dcpl_cache.pline;
    idx_info.layout  = &dset->shared->layout.u.chunk;
    idx_info.storage = &dset->shared->layout.storage.u.chunk;

    /* If the dataset is not written, return without errors */
    if (H5F_addr_defined(idx_info.storage->idx_addr)) {
        /* Calculate the scaled of this chunk */
        H5VM_chunk_scaled(dset->shared->ndims, offset, layout->u.chunk.dim, udata.scaled);
        udata.scaled[dset->shared->ndims] = 0;

        /* Initialize before iteration */
        udata.ndims       = dset->shared->ndims;
        udata.nbytes      = 0;
        udata.filter_mask = 0;
        udata.chunk_addr  = HADDR_UNDEF;
        udata.found       = FALSE;

        /* Iterate over the allocated chunks to find the requested chunk */
        if ((dset->shared->layout.storage.u.chunk.ops->iterate)(&idx_info, H5D__get_chunk_info_by_coord_cb,
                                                                &udata) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL,
                        "unable to retrieve information of the chunk by its scaled coordinates")

        /* Obtain requested info if the chunk is found */
        if (udata.found) {
            if (filter_mask)
                *filter_mask = udata.filter_mask;
            if (addr)
                *addr = udata.chunk_addr;
            if (size)
                *size = udata.nbytes;
        } /* end if */
    }     /* end if H5F_addr_defined */

done:
    FUNC_LEAVE_NOAPI_TAG(ret_value)
} /* end H5D__get_chunk_info_by_coord() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_iter_cb
 *
 * Purpose:     Call the user-defined function with the chunk data. The iterator continues if
 *              the user-defined function returns H5_ITER_CONT, and stops if H5_ITER_STOP is
 *              returned.
 *
 * Return:      Success:    H5_ITER_CONT or H5_ITER_STOP
 *              Failure:    Negative (H5_ITER_ERROR)
 *
 * Programmer:  Gaute Hope
 *              August 2020
 *
 *-------------------------------------------------------------------------
 */
static int
H5D__chunk_iter_cb(const H5D_chunk_rec_t *chunk_rec, void *udata)
{
    const H5D_chunk_iter_ud_t *data      = (H5D_chunk_iter_ud_t *)udata;
    int                        ret_value = H5_ITER_CONT;

    FUNC_ENTER_PACKAGE_NOERR

    /* Check for callback failure and pass along return value */
    if ((ret_value = (data->op)(chunk_rec->scaled, chunk_rec->filter_mask, chunk_rec->chunk_addr,
                                chunk_rec->nbytes, data->op_data)) < 0)
        HERROR(H5E_DATASET, H5E_CANTNEXT, "iteration operator failed");

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_iter_cb */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_iter
 *
 * Purpose:     Iterate over all the chunks in the dataset with given callback.
 *
 * Return:      Success:        Non-negative
 *              Failure:        Negative
 *
 * Programmer:  Gaute Hope
 *              August 2020
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_iter(H5D_t *dset, H5D_chunk_iter_op_t op, void *op_data)
{
    const H5D_rdcc_t * rdcc   = NULL;       /* Raw data chunk cache */
    H5O_layout_t *     layout = NULL;       /* Dataset layout */
    H5D_rdcc_ent_t *   ent;                 /* Cache entry index */
    H5D_chk_idx_info_t idx_info;            /* Chunked index info */
    herr_t             ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE_TAG(dset->oloc.addr)

    /* Check args */
    HDassert(dset);
    HDassert(dset->shared);

    /* Get dataset layout and raw data chunk cache */
    layout = &(dset->shared->layout);
    rdcc   = &(dset->shared->cache.chunk);
    HDassert(layout);
    HDassert(rdcc);
    HDassert(H5D_CHUNKED == layout->type);

    /* Search for cached chunks that haven't been written out */
    for (ent = rdcc->head; ent; ent = ent->next)
        /* Flush the chunk out to disk, to make certain the size is correct later */
        if (H5D__chunk_flush_entry(dset, ent, FALSE) < 0)
            HGOTO_ERROR(H5E_DATASET, H5E_CANTFLUSH, FAIL, "cannot flush indexed storage buffer")

    /* Compose chunked index info struct */
    idx_info.f       = dset->oloc.file;
    idx_info.pline   = &dset->shared->dcpl_cache.pline;
    idx_info.layout  = &layout->u.chunk;
    idx_info.storage = &layout->storage.u.chunk;

    /* If the dataset is not written, return without errors */
    if (H5F_addr_defined(idx_info.storage->idx_addr)) {
        H5D_chunk_iter_ud_t ud;

        /* Set up info for iteration callback */
        ud.op      = op;
        ud.op_data = op_data;

        /* Iterate over the allocated chunks calling the iterator callback */
        if ((ret_value = (layout->storage.u.chunk.ops->iterate)(&idx_info, H5D__chunk_iter_cb, &ud)) < 0)
            HERROR(H5E_DATASET, H5E_CANTNEXT, "chunk iteration failed");
    } /* end if H5F_addr_defined */

done:
    FUNC_LEAVE_NOAPI_TAG(ret_value)
} /* end H5D__chunk_iter() */

/*-------------------------------------------------------------------------
 * Function:    H5D__chunk_get_offset_copy
 *
 * Purpose:     Copies an offset buffer and performs bounds checks on the
 *              values.
 *
 *              This helper function ensures that the offset buffer given
 *              by the user is suitable for use with the rest of the library.
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D__chunk_get_offset_copy(const H5D_t *dset, const hsize_t *offset, hsize_t *offset_copy)
{
    unsigned u;
    herr_t   ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    HDassert(dset);
    HDassert(offset);
    HDassert(offset_copy);

    /* The library's chunking code requires the offset to terminate with a zero.
     * So transfer the offset array to an internal offset array that we
     * can properly terminate (handled via the memset call).
     */
    HDmemset(offset_copy, 0, H5O_LAYOUT_NDIMS * sizeof(hsize_t));

    for (u = 0; u < dset->shared->ndims; u++) {
        /* Make sure the offset doesn't exceed the dataset's dimensions */
        if (offset[u] > dset->shared->curr_dims[u])
            HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "offset exceeds dimensions of dataset")

        /* Make sure the offset fall right on a chunk's boundary */
        if (offset[u] % dset->shared->layout.u.chunk.dim[u])
            HGOTO_ERROR(H5E_DATASET, H5E_BADVALUE, FAIL, "offset doesn't fall on chunks's boundary")

        offset_copy[u] = offset[u];
    }

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D__chunk_get_offset_copy() */