[svn-r16356] Description:

	Bring r16354 back from trunk:

        Refactor internal layout information, making it easier to add another
type of chunk index.

Tested on:
	FreeBSD/32 (duty)
	(other configurations tested with original change)

14 files changed, 520 insertions, 245 deletions

diff --git a/src/H5Dbtree.c b/src/H5Dbtree.c
index baa4c6b..b0988c1 100644
--- a/src/H5Dbtree.c
+++ b/src/H5Dbtree.c
@@ -156,6 +156,7 @@ static herr_t H5D_btree_debug_key(FILE *stream, H5F_t *f, hid_t dxpl_id,
 /* Chunked layout indexing callbacks */
 static herr_t H5D_btree_idx_init(const H5D_chk_idx_info_t *idx_info);
 static herr_t H5D_btree_idx_create(const H5D_chk_idx_info_t *idx_info);
+static hbool_t H5D_btree_idx_is_space_alloc(const H5O_layout_t *layout);
 static herr_t H5D_btree_idx_insert(const H5D_chk_idx_info_t *idx_info,
     H5D_chunk_ud_t *udata);
 static herr_t H5D_btree_idx_get_addr(const H5D_chk_idx_info_t *idx_info,
@@ -171,6 +172,9 @@ static herr_t H5D_btree_idx_copy_shutdown(H5O_layout_t *layout_src,
     H5O_layout_t *layout_dst);
 static herr_t H5D_btree_idx_size(const H5D_chk_idx_info_t *idx_info,
     hsize_t *size);
+static herr_t H5D_btree_idx_reset(H5O_layout_t *layout);
+static herr_t H5D_btree_idx_dump(const H5D_chk_idx_info_t *idx_info,
+    FILE *stream);
 static herr_t H5D_btree_idx_dest(const H5D_chk_idx_info_t *idx_info);
 
 
@@ -182,6 +186,7 @@ static herr_t H5D_btree_idx_dest(const H5D_chk_idx_info_t *idx_info);
 const H5D_chunk_ops_t H5D_COPS_BTREE[1] = {{
     H5D_btree_idx_init,
     H5D_btree_idx_create,
+    H5D_btree_idx_is_space_alloc,
     H5D_btree_idx_insert,
     H5D_btree_idx_get_addr,
     H5D_btree_idx_iterate,
@@ -190,6 +195,8 @@ const H5D_chunk_ops_t H5D_COPS_BTREE[1] = {{
     H5D_btree_idx_copy_setup,
     H5D_btree_idx_copy_shutdown,
     H5D_btree_idx_size,
+    H5D_btree_idx_reset,
+    H5D_btree_idx_dump,
     H5D_btree_idx_dest
 }};
 
@@ -246,13 +253,14 @@ H5D_btree_get_shared(const H5F_t UNUSED *f, const void *_udata)
 
     HDassert(udata);
     HDassert(udata->mesg);
-    HDassert(udata->mesg->u.chunk.btree_shared);
+    HDassert(udata->mesg->u.chunk.idx_type == H5D_CHUNK_BTREE);
+    HDassert(udata->mesg->u.chunk.u.btree.shared);
 
     /* Increment reference count on B-tree info */
-    H5RC_INC(udata->mesg->u.chunk.btree_shared);
+    H5RC_INC(udata->mesg->u.chunk.u.btree.shared);
 
     /* Return the pointer to the ref-count object */
-    FUNC_LEAVE_NOAPI(udata->mesg->u.chunk.btree_shared)
+    FUNC_LEAVE_NOAPI(udata->mesg->u.chunk.u.btree.shared)
 } /* end H5D_btree_get_shared() */
 
 
@@ -832,7 +840,7 @@ H5D_btree_shared_create(const H5F_t *f, H5O_layout_t *layout)
         /* <none> */
 
     /* Make shared B-tree info reference counted */
-    if(NULL == (layout->u.chunk.btree_shared = H5RC_create(shared, H5B_shared_free)))
+    if(NULL == (layout->u.chunk.u.btree.shared = H5RC_create(shared, H5B_shared_free)))
 	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't create ref-count wrapper for shared B-tree info")
 
 done:
@@ -903,12 +911,13 @@ H5D_btree_idx_create(const H5D_chk_idx_info_t *idx_info)
     HDassert(idx_info);
     HDassert(idx_info->f);
     HDassert(idx_info->layout);
+    HDassert(!H5F_addr_defined(idx_info->layout->u.chunk.u.btree.addr));
 
     /* Initialize "user" data for B-tree callbacks, etc. */
     udata.mesg = idx_info->layout;
 
     /* Create the v1 B-tree for the chunk index */
-    if(H5B_create(idx_info->f, idx_info->dxpl_id, H5B_BTREE, &udata, &(idx_info->layout->u.chunk.addr)/*out*/) < 0)
+    if(H5B_create(idx_info->f, idx_info->dxpl_id, H5B_BTREE, &udata, &(idx_info->layout->u.chunk.u.btree.addr)/*out*/) < 0)
 	HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't create B-tree")
 
 done:
@@ -917,6 +926,35 @@ done:
 
 
 /*-------------------------------------------------------------------------
+ * Function:	H5D_btree_idx_is_space_alloc
+ *
+ * Purpose:	Query if space is allocated for index method
+ *
+ * Return:	Non-negative on success/Negative on failure
+ *
+ * Programmer:	Quincey Koziol
+ *		Thursday, January 15, 2009
+ *
+ *-------------------------------------------------------------------------
+ */
+static hbool_t
+H5D_btree_idx_is_space_alloc(const H5O_layout_t *layout)
+{
+    hbool_t ret_value;          /* Return value */
+
+    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_btree_idx_is_space_alloc)
+
+    /* Check args */
+    HDassert(layout);
+
+    /* Set return value */
+    ret_value = (hbool_t)H5F_addr_defined(layout->u.chunk.u.btree.addr);
+
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5D_btree_idx_is_space_alloc() */
+
+
+/*-------------------------------------------------------------------------
  * Function:	H5D_btree_idx_insert
  *
  * Purpose:	Create the chunk it if it doesn't exist, or reallocate the
@@ -939,13 +977,14 @@ H5D_btree_idx_insert(const H5D_chk_idx_info_t *idx_info, H5D_chunk_ud_t *udata)
     HDassert(idx_info);
     HDassert(idx_info->f);
     HDassert(idx_info->layout);
+    HDassert(H5F_addr_defined(idx_info->layout->u.chunk.u.btree.addr));
     HDassert(udata);
 
     /*
      * Create the chunk it if it doesn't exist, or reallocate the chunk if
      * its size changed.
      */
-    if(H5B_insert(idx_info->f, idx_info->dxpl_id, H5B_BTREE, idx_info->layout->u.chunk.addr, udata) < 0)
+    if(H5B_insert(idx_info->f, idx_info->dxpl_id, H5B_BTREE, idx_info->layout->u.chunk.u.btree.addr, udata) < 0)
         HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to allocate chunk")
 
 done:
@@ -981,7 +1020,7 @@ H5D_btree_idx_get_addr(const H5D_chk_idx_info_t *idx_info, H5D_chunk_ud_t *udata
     HDassert(udata);
 
     /* Go get the chunk information from the B-tree */
-    if(H5B_find(idx_info->f, idx_info->dxpl_id, H5B_BTREE, idx_info->layout->u.chunk.addr, udata) < 0)
+    if(H5B_find(idx_info->f, idx_info->dxpl_id, H5B_BTREE, idx_info->layout->u.chunk.u.btree.addr, udata) < 0)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get chunk info")
 
 done:
@@ -1062,6 +1101,7 @@ H5D_btree_idx_iterate(const H5D_chk_idx_info_t *idx_info,
     HDassert(idx_info);
     HDassert(idx_info->f);
     HDassert(idx_info->layout);
+    HDassert(H5F_addr_defined(idx_info->layout->u.chunk.u.btree.addr));
     HDassert(chunk_cb);
     HDassert(chunk_udata);
 
@@ -1072,7 +1112,7 @@ H5D_btree_idx_iterate(const H5D_chk_idx_info_t *idx_info,
     udata.udata = chunk_udata;
 
     /* Iterate over existing chunks */
-    if((ret_value = H5B_iterate(idx_info->f, idx_info->dxpl_id, H5B_BTREE, idx_info->layout->u.chunk.addr, H5D_btree_idx_iterate_cb, &udata)) < 0)
+    if((ret_value = H5B_iterate(idx_info->f, idx_info->dxpl_id, H5B_BTREE, idx_info->layout->u.chunk.u.btree.addr, H5D_btree_idx_iterate_cb, &udata)) < 0)
         HERROR(H5E_DATASET, H5E_BADITER, "unable to iterate over chunk B-tree");
 
     FUNC_LEAVE_NOAPI(ret_value)
@@ -1101,12 +1141,13 @@ H5D_btree_idx_remove(const H5D_chk_idx_info_t *idx_info, H5D_chunk_common_ud_t *
     HDassert(idx_info);
     HDassert(idx_info->f);
     HDassert(idx_info->layout);
+    HDassert(H5F_addr_defined(idx_info->layout->u.chunk.u.btree.addr));
     HDassert(udata);
 
     /* Remove the chunk from the v1 B-tree index and release the space for the
      * chunk (in the B-tree callback).
      */
-    if(H5B_remove(idx_info->f, idx_info->dxpl_id, H5B_BTREE, idx_info->layout->u.chunk.addr, udata) < 0)
+    if(H5B_remove(idx_info->f, idx_info->dxpl_id, H5B_BTREE, idx_info->layout->u.chunk.u.btree.addr, udata) < 0)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTDELETE, FAIL, "unable to remove chunk entry")
 
 done:
@@ -1131,8 +1172,6 @@ done:
 static herr_t
 H5D_btree_idx_delete(const H5D_chk_idx_info_t *idx_info)
 {
-    H5O_layout_t tmp_layout;        /* Local copy of layout info */
-    H5D_btree_ud0_t	udata;      /* User data for B-tree iterator call */
     herr_t ret_value = SUCCEED;     /* Return value */
 
     FUNC_ENTER_NOAPI_NOINIT(H5D_btree_idx_delete)
@@ -1141,26 +1180,31 @@ H5D_btree_idx_delete(const H5D_chk_idx_info_t *idx_info)
     HDassert(idx_info);
     HDassert(idx_info->f);
     HDassert(idx_info->layout);
-    HDassert(H5F_addr_defined(idx_info->layout->u.chunk.addr));
 
-    /* Set up user data for B-tree deletion */
-    HDmemset(&udata, 0, sizeof udata);
-    tmp_layout = *idx_info->layout;
-    udata.mesg = &tmp_layout;
+    /* Check if the index data structure has been allocated */
+    if(H5F_addr_defined(idx_info->layout->u.chunk.u.btree.addr)) {
+        H5O_layout_t tmp_layout;        /* Local copy of layout info */
+        H5D_btree_ud0_t	udata;          /* User data for B-tree iterator call */
 
-    /* Set up the shared structure */
-    if(H5D_btree_shared_create(idx_info->f, &tmp_layout) < 0)
-        HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't create wrapper for shared B-tree info")
+        /* Set up user data for B-tree deletion */
+        HDmemset(&udata, 0, sizeof udata);
+        tmp_layout = *idx_info->layout;
+        udata.mesg = &tmp_layout;
 
-    /* Delete entire B-tree */
-    if(H5B_delete(idx_info->f, idx_info->dxpl_id, H5B_BTREE, tmp_layout.u.chunk.addr, &udata) < 0)
-        HGOTO_ERROR(H5E_DATASET, H5E_CANTDELETE, FAIL, "unable to delete chunk B-tree")
+        /* Set up the shared structure */
+        if(H5D_btree_shared_create(idx_info->f, &tmp_layout) < 0)
+            HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't create wrapper for shared B-tree info")
 
-    /* Free the raw B-tree node buffer */
-    if(NULL == tmp_layout.u.chunk.btree_shared)
-        HGOTO_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "ref-counted page nil")
-    if(H5RC_DEC(tmp_layout.u.chunk.btree_shared) < 0)
-        HGOTO_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "unable to decrement ref-counted page")
+        /* Delete entire B-tree */
+        if(H5B_delete(idx_info->f, idx_info->dxpl_id, H5B_BTREE, tmp_layout.u.chunk.u.btree.addr, &udata) < 0)
+            HGOTO_ERROR(H5E_DATASET, H5E_CANTDELETE, FAIL, "unable to delete chunk B-tree")
+
+        /* Free the raw B-tree node buffer */
+        if(NULL == tmp_layout.u.chunk.u.btree.shared)
+            HGOTO_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "ref-counted page nil")
+        if(H5RC_DEC(tmp_layout.u.chunk.u.btree.shared) < 0)
+            HGOTO_ERROR(H5E_DATASET, H5E_CANTFREE, FAIL, "unable to decrement ref-counted page")
+    } /* end if */
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
@@ -1193,7 +1237,7 @@ H5D_btree_idx_copy_setup(const H5D_chk_idx_info_t *idx_info_src,
     HDassert(idx_info_dst);
     HDassert(idx_info_dst->f);
     HDassert(idx_info_dst->layout);
-    HDassert(!H5F_addr_defined(idx_info_dst->layout->u.chunk.addr));
+    HDassert(!H5F_addr_defined(idx_info_dst->layout->u.chunk.u.btree.addr));
 
     /* Create shared B-tree info for each file */
     if(H5D_btree_shared_create(idx_info_src->f, idx_info_src->layout) < 0)
@@ -1204,6 +1248,7 @@ H5D_btree_idx_copy_setup(const H5D_chk_idx_info_t *idx_info_src,
     /* Create the root of the B-tree that describes chunked storage in the dest. file */
     if(H5D_btree_idx_create(idx_info_dst) < 0)
         HGOTO_ERROR(H5E_IO, H5E_CANTINIT, FAIL, "unable to initialize chunked storage")
+    HDassert(H5F_addr_defined(idx_info_dst->layout->u.chunk.u.btree.addr));
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
@@ -1233,9 +1278,9 @@ H5D_btree_idx_copy_shutdown(H5O_layout_t *layout_src, H5O_layout_t *layout_dst)
     HDassert(layout_dst);
 
     /* Decrement refcount on shared B-tree info */
-    if(H5RC_DEC(layout_src->u.chunk.btree_shared) < 0)
+    if(H5RC_DEC(layout_src->u.chunk.u.btree.shared) < 0)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTDEC, FAIL, "unable to decrement ref-counted page")
-    if(H5RC_DEC(layout_dst->u.chunk.btree_shared) < 0)
+    if(H5RC_DEC(layout_dst->u.chunk.u.btree.shared) < 0)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTDEC, FAIL, "unable to decrement ref-counted page")
 
 done:
@@ -1282,7 +1327,7 @@ H5D_btree_idx_size(const H5D_chk_idx_info_t *idx_info, hsize_t *index_size)
     udata.mesg = idx_info->layout;
 
     /* Get metadata information for B-tree */
-    if(H5B_get_info(idx_info->f, idx_info->dxpl_id, H5B_BTREE, idx_info->layout->u.chunk.addr, &bt_info, NULL, &udata) < 0)
+    if(H5B_get_info(idx_info->f, idx_info->dxpl_id, H5B_BTREE, idx_info->layout->u.chunk.u.btree.addr, &bt_info, NULL, &udata) < 0)
         HGOTO_ERROR(H5E_BTREE, H5E_CANTINIT, FAIL, "unable to iterate over chunk B-tree")
 
     /* Set the size of the B-tree */
@@ -1290,9 +1335,9 @@ H5D_btree_idx_size(const H5D_chk_idx_info_t *idx_info, hsize_t *index_size)
 
 done:
     if(shared_init) {
-        if(idx_info->layout->u.chunk.btree_shared == NULL)
+        if(NULL == idx_info->layout->u.chunk.u.btree.shared)
             HDONE_ERROR(H5E_IO, H5E_CANTFREE, FAIL, "ref-counted page nil")
-        if(H5RC_DEC(idx_info->layout->u.chunk.btree_shared) < 0)
+        if(H5RC_DEC(idx_info->layout->u.chunk.u.btree.shared) < 0)
             HDONE_ERROR(H5E_IO, H5E_CANTFREE, FAIL, "unable to decrement ref-counted page")
     } /* end if */
 
@@ -1301,6 +1346,61 @@ done:
 
 
 /*-------------------------------------------------------------------------
+ * Function:	H5D_btree_idx_reset
+ *
+ * Purpose:	Reset indexing information.
+ *
+ * Return:	Non-negative on success/Negative on failure
+ *
+ * Programmer:	Quincey Koziol
+ *              Thursday, January 15, 2009
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5D_btree_idx_reset(H5O_layout_t *layout)
+{
+    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_btree_idx_reset)
+
+    HDassert(layout);
+
+    /* Reset index info */
+    layout->u.chunk.u.btree.addr = HADDR_UNDEF;
+    layout->u.chunk.u.btree.shared = NULL;
+
+    FUNC_LEAVE_NOAPI(SUCCEED)
+} /* end H5D_btree_idx_reset() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5D_btree_idx_dump
+ *
+ * Purpose:	Dump indexing information to a stream.
+ *
+ * Return:	Non-negative on success/Negative on failure
+ *
+ * Programmer:	Quincey Koziol
+ *              Thursday, January 15, 2009
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5D_btree_idx_dump(const H5D_chk_idx_info_t *idx_info, FILE *stream)
+{
+    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_btree_idx_dump)
+
+    HDassert(idx_info);
+    HDassert(idx_info->f);
+    HDassert(idx_info->layout);
+    HDassert(stream);
+
+    HDfprintf(stream, "    Address: %a\n", idx_info->layout->u.chunk.u.btree.addr);
+
+    FUNC_LEAVE_NOAPI(SUCCEED)
+} /* end H5D_btree_idx_dump() */
+
+
+/*-------------------------------------------------------------------------
  * Function:	H5D_btree_idx_dest
  *
  * Purpose:	Release indexing information in memory.
@@ -1324,9 +1424,9 @@ H5D_btree_idx_dest(const H5D_chk_idx_info_t *idx_info)
     HDassert(idx_info->layout);
 
     /* Free the raw B-tree node buffer */
-    if(idx_info->layout->u.chunk.btree_shared == NULL)
+    if(NULL == idx_info->layout->u.chunk.u.btree.shared)
         HGOTO_ERROR(H5E_IO, H5E_CANTFREE, FAIL, "ref-counted page nil")
-    if(H5RC_DEC(idx_info->layout->u.chunk.btree_shared) < 0)
+    if(H5RC_DEC(idx_info->layout->u.chunk.u.btree.shared) < 0)
 	HGOTO_ERROR(H5E_IO, H5E_CANTFREE, FAIL, "unable to decrement ref-counted page")
 
 done:
@@ -1374,9 +1474,9 @@ H5D_btree_debug(H5F_t *f, hid_t dxpl_id, haddr_t addr, FILE * stream, int indent
 done:
     if(shared_init) {
         /* Free the raw B-tree node buffer */
-        if(layout.u.chunk.btree_shared == NULL)
+        if(NULL == layout.u.chunk.u.btree.shared)
             HDONE_ERROR(H5E_IO, H5E_CANTFREE, FAIL, "ref-counted page nil")
-        if(H5RC_DEC(layout.u.chunk.btree_shared) < 0)
+        if(H5RC_DEC(layout.u.chunk.u.btree.shared) < 0)
             HDONE_ERROR(H5E_IO, H5E_CANTFREE, FAIL, "unable to decrement ref-counted page")
     } /* end if */
 
diff --git a/src/H5Dchunk.c b/src/H5Dchunk.c
index c56ff85..afcdc6d 100644
--- a/src/H5Dchunk.c
+++ b/src/H5Dchunk.c
@@ -192,9 +192,10 @@ static herr_t H5D_chunk_mem_cb(void *elem, hid_t type_id, unsigned ndims,
 /* Package Variables */
 /*********************/
 
-/* Compact storage layout I/O ops */
+/* Chunked storage layout I/O ops */
 const H5D_layout_ops_t H5D_LOPS_CHUNK[1] = {{
     H5D_chunk_new,
+    H5D_chunk_is_space_alloc,
     H5D_chunk_io_init,
     H5D_chunk_read,
     H5D_chunk_write,
@@ -218,6 +219,7 @@ const H5D_layout_ops_t H5D_LOPS_NULL[1] = {{
     NULL,
     NULL,
     NULL,
+    NULL,
 #ifdef H5_HAVE_PARALLEL
     NULL,
     NULL,
@@ -283,7 +285,6 @@ H5D_chunk_new(H5F_t *f, hid_t dapl_id, hid_t dxpl_id, H5D_t *dset,
     /* Increment # of chunk dimensions, to account for datatype size as last element */
     dset->shared->layout.u.chunk.ndims++;
     HDassert((unsigned)(dset->shared->layout.u.chunk.ndims) <= NELMTS(dset->shared->layout.u.chunk.dim));
-    HDassert(!H5F_addr_defined(dset->shared->layout.u.chunk.addr));
 
     /* Chunked storage is not compatible with external storage (currently) */
     if(dset->shared->dcpl_cache.efl.nused > 0)
@@ -328,6 +329,35 @@ done:
 
 
 /*-------------------------------------------------------------------------
+ * 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_layout_t *layout)
+{
+    hbool_t ret_value;                  /* Return value */
+
+    FUNC_ENTER_NOAPI_NOFUNC(H5D_chunk_is_space_alloc)
+
+    /* Sanity checks */
+    HDassert(layout);
+
+    /* Query index layer */
+    ret_value = (layout->u.chunk.ops->is_space_alloc)(layout);
+
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5D_chunk_is_space_alloc() */
+
+
+/*-------------------------------------------------------------------------
  * Function:	H5D_chunk_io_init
  *
  * Purpose:	Performs initialization before any sort of I/O on the raw data
@@ -1795,6 +1825,38 @@ done:
 
 
 /*-------------------------------------------------------------------------
+ * 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_layout_t *layout)
+{
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_NOAPI(H5D_chunk_idx_reset, FAIL)
+
+    /* Sanity checks */
+    HDassert(layout);
+    HDassert(layout->u.chunk.ops);
+
+    /* Reset index structures */
+    if((layout->u.chunk.ops->reset)(layout) < 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
@@ -2879,7 +2941,6 @@ H5D_chunk_allocate(H5D_t *dset, hid_t dxpl_id, hbool_t full_overwrite)
     /* Check args */
     HDassert(dset && H5D_CHUNKED == layout->type);
     HDassert(layout->u.chunk.ndims > 0 && layout->u.chunk.ndims <= H5O_LAYOUT_NDIMS);
-    HDassert(H5F_addr_defined(layout->u.chunk.addr));
     HDassert(TRUE == H5P_isa_class(dxpl_id, H5P_DATASET_XFER));
 
     /* Retrieve the dataset dimensions */
@@ -3451,7 +3512,6 @@ H5D_chunk_prune_by_extent(H5D_t *dset, hid_t dxpl_id, const hsize_t *old_dims)
     /* Check args */
     HDassert(dset && H5D_CHUNKED == layout->type);
     HDassert(layout->u.chunk.ndims > 0 && layout->u.chunk.ndims <= H5O_LAYOUT_NDIMS);
-    HDassert(H5F_addr_defined(layout->u.chunk.addr));
     HDassert(dxpl_cache);
 
     /* Fill the DXPL cache values for later use */
@@ -3670,12 +3730,9 @@ H5D_chunk_delete(H5F_t *f, hid_t dxpl_id, H5O_layout_t *layout)
     idx_info.dxpl_id = dxpl_id;
     idx_info.layout = layout;
 
-    /* Check if the index has been created in the file */
-    if(H5F_addr_defined(layout->u.chunk.addr)) {
-        /* Delete the chunked storage information in the file */
-        if((layout->u.chunk.ops->delete)(&idx_info) < 0)
-            HGOTO_ERROR(H5E_DATASET, H5E_CANTDELETE, FAIL, "unable to delete chunk index")
-    } /* end if */
+    /* Delete the chunked storage information in the file */
+    if((layout->u.chunk.ops->delete)(&idx_info) < 0)
+        HGOTO_ERROR(H5E_DATASET, H5E_CANTDELETE, FAIL, "unable to delete chunk index")
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
@@ -4010,7 +4067,6 @@ H5D_chunk_copy(H5F_t *f_src, H5O_layout_t *layout_src, H5F_t *f_dst,
     /* Call the index-specific "copy setup" routine */
     if((layout_src->u.chunk.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")
-    HDassert(H5F_addr_defined(layout_dst->u.chunk.addr));
     copy_setup_done = TRUE;
 
     /* Create datatype ID for src datatype */
@@ -4273,7 +4329,6 @@ H5D_chunk_dump_index_cb(const H5D_chunk_rec_t *chunk_rec, void *_udata)
 herr_t
 H5D_chunk_dump_index(H5D_t *dset, hid_t dxpl_id, FILE *stream)
 {
-    H5D_chunk_it_ud4_t	udata;          /* User data for callback */
     herr_t ret_value = SUCCEED;       /* Return value */
 
     FUNC_ENTER_NOAPI(H5D_chunk_dump_index, FAIL)
@@ -4283,21 +4338,23 @@ H5D_chunk_dump_index(H5D_t *dset, hid_t dxpl_id, FILE *stream)
 
     /* Only display info if stream is defined */
     if(stream) {
-        H5D_chk_idx_info_t idx_info;        /* Chunked index info */
+        H5D_chk_idx_info_t idx_info;    /* Chunked index info */
+        H5D_chunk_it_ud4_t udata;       /* User data for callback */
 
-        /* Display address of index */
-        HDfprintf(stream, "    Address: %a\n", dset->shared->layout.u.chunk.addr);
+        /* Compose chunked index info struct */
+        idx_info.f = dset->oloc.file;
+        idx_info.dxpl_id = dxpl_id;
+        idx_info.layout = &dset->shared->layout;
+
+        /* Display info for index */
+        if((dset->shared->layout.u.chunk.ops->dump)(&idx_info, stream) < 0)
+            HGOTO_ERROR(H5E_DATASET, H5E_UNSUPPORTED, FAIL, "unable to dump chunk index info")
 
         /* Set up user data for callback */
         udata.stream = stream;
         udata.header_displayed = FALSE;
         udata.ndims = dset->shared->layout.u.chunk.ndims;
 
-        /* Compose chunked index info struct */
-        idx_info.f = dset->oloc.file;
-        idx_info.dxpl_id = dxpl_id;
-        idx_info.layout = &dset->shared->layout;
-
         /* Iterate over index and dump chunk info */
         if((dset->shared->layout.u.chunk.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")
diff --git a/src/H5Dcompact.c b/src/H5Dcompact.c
index 00471d6..ad95e18 100644
--- a/src/H5Dcompact.c
+++ b/src/H5Dcompact.c
@@ -59,6 +59,7 @@
 /* Layout operation callbacks */
 static herr_t H5D_compact_new(H5F_t *f, hid_t dapl_id, hid_t dxpl_id, H5D_t *dset,
     const H5P_genplist_t *dc_plist);
+static hbool_t H5D_compact_is_space_alloc(const H5O_layout_t *layout);
 static herr_t H5D_compact_io_init(const H5D_io_info_t *io_info, const H5D_type_info_t *type_info,
     hsize_t nelmts, const H5S_t *file_space, const H5S_t *mem_space,
     H5D_chunk_map_t *cm);
@@ -77,6 +78,7 @@ static ssize_t H5D_compact_writevv(const H5D_io_info_t *io_info,
 /* Compact storage layout I/O ops */
 const H5D_layout_ops_t H5D_LOPS_COMPACT[1] = {{
     H5D_compact_new,
+    H5D_compact_is_space_alloc,
     H5D_compact_io_init,
     H5D_contig_read,
     H5D_contig_write,
@@ -199,6 +201,31 @@ done:
 
 
 /*-------------------------------------------------------------------------
+ * Function:	H5D_compact_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
+ *
+ *-------------------------------------------------------------------------
+ */
+static hbool_t
+H5D_compact_is_space_alloc(const H5O_layout_t UNUSED *layout)
+{
+    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_compact_is_space_alloc)
+
+    /* Sanity checks */
+    HDassert(layout);
+
+    /* Compact storage is currently always allocated */
+    FUNC_LEAVE_NOAPI(TRUE)
+} /* end H5D_compact_is_space_alloc() */
+
+
+/*-------------------------------------------------------------------------
  * Function:	H5D_compact_io_init
  *
  * Purpose:	Performs initialization before any sort of I/O on the raw data
diff --git a/src/H5Dcontig.c b/src/H5Dcontig.c
index 4b7a5df..112eea5 100644
--- a/src/H5Dcontig.c
+++ b/src/H5Dcontig.c
@@ -63,6 +63,7 @@
 /* Layout operation callbacks */
 static herr_t H5D_contig_new(H5F_t *f, hid_t dapl_id, hid_t dxpl_id, H5D_t *dset,
     const H5P_genplist_t *dc_plist);
+static hbool_t H5D_contig_is_space_alloc(const H5O_layout_t *layout);
 static herr_t H5D_contig_io_init(const H5D_io_info_t *io_info, const H5D_type_info_t *type_info,
     hsize_t nelmts, const H5S_t *file_space, const H5S_t *mem_space,
     H5D_chunk_map_t *cm);
@@ -79,6 +80,7 @@ static herr_t H5D_contig_write_one(H5D_io_info_t *io_info, hsize_t offset,
 /* Contiguous storage layout I/O ops */
 const H5D_layout_ops_t H5D_LOPS_CONTIG[1] = {{
     H5D_contig_new,
+    H5D_contig_is_space_alloc,
     H5D_contig_io_init,
     H5D_contig_read,
     H5D_contig_write,
@@ -413,6 +415,35 @@ done:
 
 
 /*-------------------------------------------------------------------------
+ * Function:	H5D_contig_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
+ *
+ *-------------------------------------------------------------------------
+ */
+static hbool_t
+H5D_contig_is_space_alloc(const H5O_layout_t *layout)
+{
+    hbool_t ret_value;                  /* Return value */
+
+    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_contig_is_space_alloc)
+
+    /* Sanity checks */
+    HDassert(layout);
+
+    /* Set return value */
+    ret_value = (hbool_t)H5F_addr_defined(layout->u.contig.addr);
+
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5D_contig_is_space_alloc() */
+
+
+/*-------------------------------------------------------------------------
  * Function:	H5D_contig_io_init
  *
  * Purpose:	Performs initialization before any sort of I/O on the raw data
diff --git a/src/H5Defl.c b/src/H5Defl.c
index 880edfd..f3b346e 100644
--- a/src/H5Defl.c
+++ b/src/H5Defl.c
@@ -51,6 +51,7 @@
 /* Layout operation callbacks */
 static herr_t H5D_efl_new(H5F_t *f, hid_t dapl_id, hid_t dxpl_id, H5D_t *dset,
     const H5P_genplist_t *dc_plist);
+static hbool_t H5D_efl_is_space_alloc(const H5O_layout_t *layout);
 static herr_t H5D_efl_io_init(const H5D_io_info_t *io_info, const H5D_type_info_t *type_info,
     hsize_t nelmts, const H5S_t *file_space, const H5S_t *mem_space,
     H5D_chunk_map_t *cm);
@@ -75,6 +76,7 @@ static herr_t H5D_efl_write(const H5O_efl_t *efl, haddr_t addr, size_t size,
 /* External File List (EFL) storage layout I/O ops */
 const H5D_layout_ops_t H5D_LOPS_EFL[1] = {{
     H5D_efl_new,
+    H5D_efl_is_space_alloc,
     H5D_efl_io_init,
     H5D_contig_read,
     H5D_contig_write,
@@ -169,6 +171,31 @@ done:
 
 
 /*-------------------------------------------------------------------------
+ * Function:	H5D_efl_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
+ *
+ *-------------------------------------------------------------------------
+ */
+static hbool_t
+H5D_efl_is_space_alloc(const H5O_layout_t UNUSED *layout)
+{
+    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_efl_is_space_alloc)
+
+    /* Sanity checks */
+    HDassert(layout);
+
+    /* EFL storage is currently treated as allocated */
+    FUNC_LEAVE_NOAPI(TRUE)
+} /* end H5D_efl_is_space_alloc() */
+
+
+/*-------------------------------------------------------------------------
  * Function:	H5D_efl_io_init
  *
  * Purpose:	Performs initialization before any sort of I/O on the raw data
diff --git a/src/H5Dint.c b/src/H5Dint.c
index 37a4701..0e71ef8 100644
--- a/src/H5Dint.c
+++ b/src/H5Dint.c
@@ -966,6 +966,9 @@ H5D_update_oh_info(H5F_t *file, hid_t dxpl_id, H5D_t *dset)
 #endif /* H5O_ENABLE_BOGUS */
 
     /* Add a modification time message, if using older format. */
+    /* (If using the latest format, the modification time is part of the object
+     *  header and doesn't use a separate message -QAK)
+     */
     if(!use_latest_format)
         if(H5O_touch_oh(file, dxpl_id, oh, TRUE) < 0)
             HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to update modification time message")
@@ -1109,7 +1112,7 @@ H5D_create(H5F_t *file, hid_t type_id, const H5S_t *space, hid_t dcpl_id,
             HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't retrieve external file list")
     } /* end if */
 
-    /* Set the latest version of the pline & fill messages, if requested */
+    /* Set the latest version of the layout, pline & fill messages, if requested */
     if(H5F_USE_LATEST_FORMAT(file)) {
         /* Set the latest version for the I/O pipeline message */
         if(H5Z_set_latest_version(&new_dset->shared->dcpl_cache.pline) < 0)
@@ -1223,7 +1226,7 @@ H5D_open(const H5G_loc_t *loc, hid_t dapl_id, hid_t dxpl_id)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTCOPY, NULL, "can't copy path")
 
     /* Check if dataset was already open */
-    if((shared_fo = (H5D_shared_t *)H5FO_opened(dataset->oloc.file, dataset->oloc.addr)) == NULL) {
+    if(NULL == (shared_fo = (H5D_shared_t *)H5FO_opened(dataset->oloc.file, dataset->oloc.addr))) {
         /* Clear any errors from H5FO_opened() */
         H5E_clear_stack(NULL);
 
@@ -1352,38 +1355,36 @@ H5D_open_oid(H5D_t *dataset, hid_t dapl_id, hid_t dxpl_id)
      */
     if(NULL == H5O_msg_read(&(dataset->oloc), H5O_LAYOUT_ID, &(dataset->shared->layout), dxpl_id))
         HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to read data layout message")
+
+    /* Check for external file list message (which might not exist) */
+    if((msg_exists = H5O_msg_exists(&(dataset->oloc), H5O_EFL_ID, dxpl_id)) < 0)
+        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't check if message exists")
+    if(msg_exists) {
+        /* Retrieve the EFL  message */
+        if(NULL == H5O_msg_read(&(dataset->oloc), H5O_EFL_ID, &dataset->shared->dcpl_cache.efl, dxpl_id))
+            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't retrieve message")
+
+        /* Set the EFL info in the property list */
+        if(H5P_set(plist, H5D_CRT_EXT_FILE_LIST_NAME, &dataset->shared->dcpl_cache.efl) < 0)
+            HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "can't set external file list")
+
+        /* Set the dataset's I/O operations */
+        dataset->shared->layout.ops = H5D_LOPS_EFL;
+    } /* end if */
+
+    /* Sanity check that the layout operations are set up */
+    HDassert(dataset->shared->layout.ops);
+
     /* Adjust chunk dimensions to omit datatype size (in last dimension) for creation property */
     if(H5D_CHUNKED == dataset->shared->layout.type)
         dataset->shared->layout.u.chunk.ndims--;
+    /* Copy layout to the DCPL */
     if(H5P_set(plist, H5D_CRT_LAYOUT_NAME, &dataset->shared->layout) < 0)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "can't set layout")
     /* Adjust chunk dimensions back again (*sigh*) */
     if(H5D_CHUNKED == dataset->shared->layout.type)
         dataset->shared->layout.u.chunk.ndims++;
 
-    /* Get the external file list message, which might not exist.  Space is
-     * also undefined when space allocate time is H5D_ALLOC_TIME_LATE. */
-    if((dataset->shared->layout.type == H5D_CONTIGUOUS && !H5F_addr_defined(dataset->shared->layout.u.contig.addr))
-            || (dataset->shared->layout.type == H5D_CHUNKED && !H5F_addr_defined(dataset->shared->layout.u.chunk.addr))) {
-        if((msg_exists = H5O_msg_exists(&(dataset->oloc), H5O_EFL_ID, dxpl_id)) < 0)
-            HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't check if message exists")
-        if(msg_exists) {
-            /* Retrieve the EFL  message */
-            if(NULL == H5O_msg_read(&(dataset->oloc), H5O_EFL_ID, &dataset->shared->dcpl_cache.efl, dxpl_id))
-                HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't retrieve message")
-
-            /* Set the EFL info in the property list */
-            if(H5P_set(plist, H5D_CRT_EXT_FILE_LIST_NAME, &dataset->shared->dcpl_cache.efl) < 0)
-            	HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "can't set external file list")
-
-            /* Set the dataset's I/O operations */
-            dataset->shared->layout.ops = H5D_LOPS_EFL;
-        } /* end if */
-    } /* end if */
-
-    /* Sanity check that the layout operations are set up */
-    HDassert(dataset->shared->layout.ops);
-
     switch(dataset->shared->layout.type) {
         case H5D_CONTIGUOUS:
             /* Compute the size of the contiguous storage for versions of the
@@ -1476,8 +1477,7 @@ H5D_open_oid(H5D_t *dataset, hid_t dapl_id, hid_t dxpl_id)
      * be fully allocated before I/O can happen.
      */
     if((H5F_INTENT(dataset->oloc.file) & H5F_ACC_RDWR)
-            && ((dataset->shared->layout.type == H5D_CONTIGUOUS && !H5F_addr_defined(dataset->shared->layout.u.contig.addr))
-                || (dataset->shared->layout.type == H5D_CHUNKED && !H5F_addr_defined(dataset->shared->layout.u.chunk.addr)))
+            && !(*dataset->shared->layout.ops->is_space_alloc)(&dataset->shared->layout)
             && IS_H5FD_MPI(dataset->oloc.file)) {
         if(H5D_alloc_storage(dataset, dxpl_id, H5D_ALLOC_OPEN, FALSE) < 0)
             HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to initialize file storage")
@@ -1758,7 +1758,7 @@ H5D_alloc_storage(H5D_t *dset/*in,out*/, hid_t dxpl_id, H5D_time_alloc_t time_al
 
         switch(layout->type) {
             case H5D_CONTIGUOUS:
-                if(!H5F_addr_defined(layout->u.contig.addr)) {
+                if(!(*dset->shared->layout.ops->is_space_alloc)(&dset->shared->layout)) {
                     /* Reserve space in the file for the entire array */
                     if(H5D_contig_alloc(f, dxpl_id, layout/*out*/) < 0)
                         HGOTO_ERROR(H5E_IO, H5E_CANTINIT, FAIL, "unable to initialize contiguous storage")
@@ -1772,7 +1772,7 @@ H5D_alloc_storage(H5D_t *dset/*in,out*/, hid_t dxpl_id, H5D_time_alloc_t time_al
                 break;
 
             case H5D_CHUNKED:
-                if(!H5F_addr_defined(layout->u.chunk.addr)) {
+                if(!(*dset->shared->layout.ops->is_space_alloc)(&dset->shared->layout)) {
                     /* Create the root of the B-tree that describes chunked storage */
                     if(H5D_chunk_create(dset /*in,out*/, dxpl_id) < 0)
                         HGOTO_ERROR(H5E_IO, H5E_CANTINIT, FAIL, "unable to initialize chunked storage")
@@ -1954,19 +1954,20 @@ H5D_get_storage_size(H5D_t *dset, hid_t dxpl_id)
 
     switch(dset->shared->layout.type) {
         case H5D_CHUNKED:
-            if(dset->shared->layout.u.chunk.addr == HADDR_UNDEF)
-                ret_value = 0;
-            else
+            if((*dset->shared->layout.ops->is_space_alloc)(&dset->shared->layout)) {
                 if(H5D_chunk_allocated(dset, dxpl_id, &ret_value) < 0)
                     HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, 0, "can't retrieve chunked dataset allocated size")
+            } /* end if */
+            else
+                ret_value = 0;
             break;
 
         case H5D_CONTIGUOUS:
             /* Datasets which are not allocated yet are using no space on disk */
-            if(dset->shared->layout.u.contig.addr == HADDR_UNDEF)
-                ret_value = 0;
+            if((*dset->shared->layout.ops->is_space_alloc)(&dset->shared->layout))
+                ret_value = dset->shared->layout.u.contig.size;
             else
-                 ret_value = dset->shared->layout.u.contig.size;
+                ret_value = 0;
             break;
 
         case H5D_COMPACT:
@@ -2285,18 +2286,10 @@ H5D_set_extent(H5D_t *dset, const hsize_t *size, hid_t dxpl_id)
     HGOTO_ERROR(H5E_DATASET, H5E_WRITEERROR, FAIL, "no write intent on file")
 
     /* Check if we are allowed to modify the space; only datasets with chunked and external storage are allowed to be modified */
-    if( H5D_COMPACT == dset->shared->layout.type )
-    {
+    if(H5D_COMPACT == dset->shared->layout.type)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "dataset has compact storage")
-    }
-    if( H5D_CONTIGUOUS == dset->shared->layout.type  )
-    {             
-        if( 0 == dset->shared->dcpl_cache.efl.nused)
-        {
-            HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, FAIL, "dataset has contiguous storage")
-        }
-            
-    }
+    if(H5D_CONTIGUOUS == dset->shared->layout.type && 0 == dset->shared->dcpl_cache.efl.nused)
+        HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, FAIL, "dataset has contiguous storage")
  
     /* Check if the filters in the DCPL will need to encode, and if so, can they? */
     if(H5D_check_filters(dset) < 0)
@@ -2314,15 +2307,13 @@ H5D_set_extent(H5D_t *dset, const hsize_t *size, hid_t dxpl_id)
     HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to modify size of data space")
 
     /* Don't bother updating things, unless they've changed */
-    if(changed) 
-    {
+    if(changed) {
         hbool_t shrink = FALSE;             /* Flag to indicate a dimension has shrank */
         hbool_t expand = FALSE;             /* Flag to indicate a dimension has grown */
         unsigned u;                         /* Local index variable */
 
         /* Determine if we are shrinking and/or expanding any dimensions */
-        for(u = 0; u < (unsigned)rank; u++) 
-        {
+        for(u = 0; u < (unsigned)rank; u++) {
             if(size[u] < curr_dims[u])
                 shrink = TRUE;
             if(size[u] > curr_dims[u])
@@ -2350,10 +2341,8 @@ H5D_set_extent(H5D_t *dset, const hsize_t *size, hid_t dxpl_id)
          * and if the chunks are written 
          *-------------------------------------------------------------------------
          */
-         if( shrink && 
-             H5D_CHUNKED == dset->shared->layout.type &&
-             H5F_addr_defined(dset->shared->layout.u.chunk.addr)) 
-         {
+        if(shrink && H5D_CHUNKED == dset->shared->layout.type &&
+                (*dset->shared->layout.ops->is_space_alloc)(&dset->shared->layout)) {
              /* Remove excess chunks */
              if(H5D_chunk_prune_by_extent(dset, dxpl_id, curr_dims) < 0)
                  HGOTO_ERROR(H5E_DATASET, H5E_WRITEERROR, FAIL, "unable to remove chunks ")
diff --git a/src/H5Dio.c b/src/H5Dio.c
index 9308c33..c1d57fd 100644
--- a/src/H5Dio.c
+++ b/src/H5Dio.c
@@ -351,8 +351,7 @@ H5D_read(H5D_t *dataset, hid_t mem_type_id, const H5S_t *mem_space,
      * has been overwritten.  So just proceed in reading.
      */
     if(nelmts > 0 && dataset->shared->dcpl_cache.efl.nused == 0 &&
-            ((dataset->shared->layout.type == H5D_CONTIGUOUS && !H5F_addr_defined(dataset->shared->layout.u.contig.addr))
-                || (dataset->shared->layout.type == H5D_CHUNKED && !H5F_addr_defined(dataset->shared->layout.u.chunk.addr)))) {
+            !(*dataset->shared->layout.ops->is_space_alloc)(&dataset->shared->layout)) {
         H5D_fill_value_t fill_status;   /* Whether/How the fill value is defined */
 
         /* Retrieve dataset's fill-value properties */
@@ -386,8 +385,7 @@ H5D_read(H5D_t *dataset, hid_t mem_type_id, const H5S_t *mem_space,
 
     /* Sanity check that space is allocated, if there are elements */
     if(nelmts > 0)
-        HDassert(((dataset->shared->layout.type == H5D_CONTIGUOUS && H5F_addr_defined(dataset->shared->layout.u.contig.addr))
-                || (dataset->shared->layout.type == H5D_CHUNKED && H5F_addr_defined(dataset->shared->layout.u.chunk.addr)))
+        HDassert((*dataset->shared->layout.ops->is_space_alloc)(&dataset->shared->layout)
                 || dataset->shared->dcpl_cache.efl.nused > 0
                 || dataset->shared->layout.type == H5D_COMPACT);
 
@@ -537,8 +535,7 @@ H5D_write(H5D_t *dataset, hid_t mem_type_id, const H5S_t *mem_space,
 
     /* Allocate data space and initialize it if it hasn't been. */
     if(nelmts > 0 && dataset->shared->dcpl_cache.efl.nused == 0 &&
-            ((dataset->shared->layout.type == H5D_CONTIGUOUS && !H5F_addr_defined(dataset->shared->layout.u.contig.addr))
-                || (dataset->shared->layout.type == H5D_CHUNKED && !H5F_addr_defined(dataset->shared->layout.u.chunk.addr)))) {
+            !(*dataset->shared->layout.ops->is_space_alloc)(&dataset->shared->layout)) {
         hssize_t file_nelmts;   /* Number of elements in file dataset's dataspace */
         hbool_t full_overwrite; /* Whether we are over-writing all the elements */
 
diff --git a/src/H5Doh.c b/src/H5Doh.c
index 88ab971..be4c5bd 100644
--- a/src/H5Doh.c
+++ b/src/H5Doh.c
@@ -376,7 +376,7 @@ H5O_dset_bh_info(H5F_t *f, hid_t dxpl_id, H5O_t *oh, H5_ih_info_t *bh_info)
 	HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't find LAYOUT message")
 
     /* Check for chunked dataset storage */
-    if((layout.type == H5D_CHUNKED) && H5F_addr_defined(layout.u.chunk.addr))
+    if(layout.type == H5D_CHUNKED && H5D_chunk_is_space_alloc(&layout))
         if(H5D_chunk_bh_info(f, dxpl_id, &layout, &(bh_info->index_size)) < 0)
             HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't determine chunked dataset btree info")
 
diff --git a/src/H5Dpkg.h b/src/H5Dpkg.h
index b0d7d6a..4bf4e75 100644
--- a/src/H5Dpkg.h
+++ b/src/H5Dpkg.h
@@ -102,6 +102,7 @@ struct H5D_chunk_map_t;
 /* Function pointers for I/O on particular types of dataset layouts */
 typedef herr_t (*H5D_layout_new_func_t)(H5F_t *f, hid_t dapl_id, hid_t dxpl_id,
     H5D_t *dset, const H5P_genplist_t *dc_plist);
+typedef hbool_t (*H5D_layout_is_space_alloc_func_t)(const H5O_layout_t *layout);
 typedef herr_t (*H5D_layout_io_init_func_t)(const struct H5D_io_info_t *io_info,
     const H5D_type_info_t *type_info,
     hsize_t nelmts, const H5S_t *file_space, const H5S_t *mem_space,
@@ -123,6 +124,7 @@ typedef herr_t (*H5D_layout_io_term_func_t)(const struct H5D_chunk_map_t *cm);
 /* Typedef for grouping layout I/O routines */
 typedef struct H5D_layout_ops_t {
     H5D_layout_new_func_t new;          /* Layout constructor for new datasets */
+    H5D_layout_is_space_alloc_func_t is_space_alloc;    /* Query routine to determine if storage is allocated */
     H5D_layout_io_init_func_t io_init;  /* I/O initialization routine */
     H5D_layout_read_func_t ser_read;    /* High-level I/O routine for reading data in serial */
     H5D_layout_write_func_t ser_write;  /* High-level I/O routine for writing data in serial */
@@ -262,6 +264,7 @@ typedef int (*H5D_chunk_cb_func_t)(const H5D_chunk_rec_t *chunk_rec,
 /* Typedefs for chunk operations */
 typedef herr_t (*H5D_chunk_init_func_t)(const H5D_chk_idx_info_t *idx_info);
 typedef herr_t (*H5D_chunk_create_func_t)(const H5D_chk_idx_info_t *idx_info);
+typedef hbool_t (*H5D_chunk_is_space_alloc_func_t)(const H5O_layout_t *layout);
 typedef herr_t (*H5D_chunk_insert_func_t)(const H5D_chk_idx_info_t *idx_info,
     H5D_chunk_ud_t *udata);
 typedef herr_t (*H5D_chunk_get_addr_func_t)(const H5D_chk_idx_info_t *idx_info,
@@ -277,12 +280,16 @@ typedef herr_t (*H5D_chunk_copy_shutdown_func_t)(H5O_layout_t *layout_src,
     H5O_layout_t *layout_dst);
 typedef herr_t (*H5D_chunk_size_func_t)(const H5D_chk_idx_info_t *idx_info,
     hsize_t *idx_size);
+typedef herr_t (*H5D_chunk_reset_func_t)(H5O_layout_t *layout);
+typedef herr_t (*H5D_chunk_dump_func_t)(const H5D_chk_idx_info_t *idx_info,
+    FILE *stream);
 typedef herr_t (*H5D_chunk_dest_func_t)(const H5D_chk_idx_info_t *idx_info);
 
 /* Typedef for grouping chunk I/O routines */
 typedef struct H5D_chunk_ops_t {
     H5D_chunk_init_func_t init;             /* Routine to initialize indexing information in memory */
     H5D_chunk_create_func_t create;         /* Routine to create chunk index */
+    H5D_chunk_is_space_alloc_func_t is_space_alloc;    /* Query routine to determine if storage/index is allocated */
     H5D_chunk_insert_func_t insert;         /* Routine to insert a chunk into an index */
     H5D_chunk_get_addr_func_t get_addr;     /* Routine to retrieve address of chunk in file */
     H5D_chunk_iterate_func_t iterate;       /* Routine to iterate over chunks */
@@ -291,6 +298,8 @@ typedef struct H5D_chunk_ops_t {
     H5D_chunk_copy_setup_func_t copy_setup; /* Routine to perform any necessary setup for copying chunks */
     H5D_chunk_copy_shutdown_func_t copy_shutdown; /* Routine to perform any necessary shutdown for copying chunks */
     H5D_chunk_size_func_t size;             /* Routine to get size of indexing information */
+    H5D_chunk_reset_func_t reset;           /* Routine to reset indexing information */
+    H5D_chunk_dump_func_t dump;             /* Routine to dump indexing information */
     H5D_chunk_dest_func_t dest;             /* Routine to destroy indexing information in memory */
 } H5D_chunk_ops_t;
 
@@ -566,6 +575,7 @@ H5_DLL hbool_t H5D_chunk_cacheable(const H5D_io_info_t *io_info, haddr_t caddr);
 H5_DLL herr_t H5D_chunk_cinfo_cache_reset(H5D_chunk_cached_t *last);
 H5_DLL herr_t H5D_chunk_create(H5D_t *dset /*in,out*/, hid_t dxpl_id);
 H5_DLL herr_t H5D_chunk_init(H5F_t *f, hid_t dapl_id, hid_t dxpl_id, const H5D_t *dset);
+H5_DLL hbool_t H5D_chunk_is_space_alloc(const H5O_layout_t *layout);
 H5_DLL herr_t H5D_chunk_get_info(const H5D_t *dset, hid_t dxpl_id,
     const hsize_t *chunk_offset, H5D_chunk_ud_t *udata);
 H5_DLL void *H5D_chunk_lock(const H5D_io_info_t *io_info,
diff --git a/src/H5Dprivate.h b/src/H5Dprivate.h
index 7f044e5..7c78d71 100644
--- a/src/H5Dprivate.h
+++ b/src/H5Dprivate.h
@@ -28,6 +28,7 @@
 #include "H5Sprivate.h"		/* Dataspaces 				*/
 #include "H5Zprivate.h"		/* Data filters				*/
 
+
 /**************************/
 /* Library Private Macros */
 /**************************/
@@ -106,6 +107,7 @@
 #define H5D_VLEN_FREE           NULL
 #define H5D_VLEN_FREE_INFO      NULL
 
+
 /****************************/
 /* Library Private Typedefs */
 /****************************/
@@ -137,10 +139,12 @@ typedef struct H5D_dcpl_cache_t {
     H5O_efl_t efl;              /* External file list info (H5D_CRT_EXT_FILE_LIST_NAME) */
 } H5D_dcpl_cache_t;
 
+
 /*****************************/
 /* Library Private Variables */
 /*****************************/
 
+
 /******************************/
 /* Library Private Prototypes */
 /******************************/
@@ -162,6 +166,7 @@ H5_DLL herr_t H5D_contig_delete(H5F_t *f, hid_t dxpl_id,
     const H5O_layout_t *layout);
 
 /* Functions that operate on chunked storage */
+H5_DLL herr_t H5D_chunk_idx_reset(H5O_layout_t *layout);
 H5_DLL herr_t H5D_chunk_delete(H5F_t *f, hid_t dxpl_id, H5O_layout_t *layout);
 
 /* Functions that operate on indexed storage */
diff --git a/src/H5Dpublic.h b/src/H5Dpublic.h
index 636c449..bae5dcf 100644
--- a/src/H5Dpublic.h
+++ b/src/H5Dpublic.h
@@ -48,6 +48,11 @@ typedef enum H5D_layout_t {
     H5D_NLAYOUTS	= 3	/*this one must be last!		     */
 } H5D_layout_t;
 
+/* Types of chunk index data structures */
+typedef enum H5D_chunk_index_t {
+    H5D_CHUNK_BTREE	= 0,	/* v1 B-tree index			     */
+} H5D_chunk_index_t;
+
 /* Values for the space allocation time property */
 typedef enum H5D_alloc_time_t {
     H5D_ALLOC_TIME_ERROR	= -1,
diff --git a/src/H5Olayout.c b/src/H5Olayout.c
index 59cd7db..a23e3ef 100644
--- a/src/H5Olayout.c
+++ b/src/H5Olayout.c
@@ -110,7 +110,6 @@ H5O_layout_decode(H5F_t *f, hid_t UNUSED dxpl_id, unsigned UNUSED mesg_flags,
     if(NULL == (mesg = H5FL_CALLOC(H5O_layout_t)))
         HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")
 
-    /* Version. 1 when space allocated; 2 when space allocation is delayed */
     mesg->version = *p++;
     if(mesg->version < H5O_LAYOUT_VERSION_1 || mesg->version > H5O_LAYOUT_VERSION_3)
         HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, NULL, "bad version number for layout message")
@@ -138,13 +137,14 @@ H5O_layout_decode(H5F_t *f, hid_t UNUSED dxpl_id, unsigned UNUSED mesg_flags,
             mesg->ops = H5D_LOPS_CONTIG;
         } /* end if */
         else if(mesg->type == H5D_CHUNKED) {
-            H5F_addr_decode(f, &p, &(mesg->u.chunk.addr));
+            H5F_addr_decode(f, &p, &(mesg->u.chunk.u.btree.addr));
 
             /* Set the layout operations */
             mesg->ops = H5D_LOPS_CHUNK;
 
             /* Set the chunk operations */
-            /* (Only "btree" indexing type currently supported */
+            /* (Only "btree" indexing type currently supported in this version) */
+            mesg->u.chunk.idx_type = H5D_CHUNK_BTREE;
             mesg->u.chunk.ops = H5D_COPS_BTREE;
         } /* end if */
         else {
@@ -219,7 +219,7 @@ H5O_layout_decode(H5F_t *f, hid_t UNUSED dxpl_id, unsigned UNUSED mesg_flags,
                     HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, NULL, "dimensionality is too large")
 
                 /* B-tree address */
-                H5F_addr_decode(f, &p, &(mesg->u.chunk.addr));
+                H5F_addr_decode(f, &p, &(mesg->u.chunk.u.btree.addr));
 
                 /* Chunk dimensions */
                 for(u = 0; u < mesg->u.chunk.ndims; u++)
@@ -229,12 +229,13 @@ H5O_layout_decode(H5F_t *f, hid_t UNUSED dxpl_id, unsigned UNUSED mesg_flags,
                 for(u = 1, mesg->u.chunk.size = mesg->u.chunk.dim[0]; u < mesg->u.chunk.ndims; u++)
                     mesg->u.chunk.size *= mesg->u.chunk.dim[u];
 
-                /* Set the layout operations */
-                mesg->ops = H5D_LOPS_CHUNK;
-
                 /* Set the chunk operations */
-                /* (Only "btree" indexing type currently supported */
+                /* (Only "btree" indexing type supported with v3 of message format) */
+                mesg->u.chunk.idx_type = H5D_CHUNK_BTREE;
                 mesg->u.chunk.ops = H5D_COPS_BTREE;
+
+                /* Set the layout operations */
+                mesg->ops = H5D_LOPS_CHUNK;
                 break;
 
             default:
@@ -298,8 +299,8 @@ H5O_layout_encode(H5F_t *f, hbool_t UNUSED disable_shared, uint8_t *p, const voi
     HDassert(mesg);
     HDassert(p);
 
-    /* Version 3 by default now. */
-    *p++ = H5O_LAYOUT_VERSION_3;
+    /* Message version */
+    *p++ = (uint8_t)mesg->version;
 
     /* Layout class */
     *p++ = mesg->type;
@@ -331,7 +332,7 @@ H5O_layout_encode(H5F_t *f, hbool_t UNUSED disable_shared, uint8_t *p, const voi
             *p++ = (uint8_t)mesg->u.chunk.ndims;
 
             /* B-tree address */
-            H5F_addr_encode(f, &p, mesg->u.chunk.addr);
+            H5F_addr_encode(f, &p, mesg->u.chunk.u.btree.addr);
 
             /* Dimension sizes */
             for(u = 0; u < mesg->u.chunk.ndims; u++)
@@ -398,69 +399,6 @@ done:
 
 
 /*-------------------------------------------------------------------------
- * Function:    H5O_layout_meta_size
- *
- * Purpose:     Returns the size of the raw message in bytes except raw data
- *              part for compact dataset.  This function doesn't take into
- *              account message alignment.
- *
- * Return:      Success:        Message data size in bytes(except raw data
- *                              for compact dataset)
- *              Failure:        0
- *
- * Programmer:  Raymond Lu
- *              August 14, 2002
- *
- *-------------------------------------------------------------------------
- */
-size_t
-H5O_layout_meta_size(const H5F_t *f, const void *_mesg)
-{
-    const H5O_layout_t      *mesg = (const H5O_layout_t *) _mesg;
-    size_t                  ret_value;
-
-    FUNC_ENTER_NOAPI_NOINIT(H5O_layout_meta_size)
-
-    /* check args */
-    HDassert(f);
-    HDassert(mesg);
-
-    ret_value = 1 +                     /* Version number                       */
-                1;                      /* layout class type                    */
-
-    switch(mesg->type) {
-        case H5D_COMPACT:
-            /* Size of raw data */
-            ret_value += 2;
-            break;
-
-        case H5D_CONTIGUOUS:
-            ret_value += H5F_SIZEOF_ADDR(f);    /* Address of data */
-            ret_value += H5F_SIZEOF_SIZE(f);    /* Length of data */
-            break;
-
-        case H5D_CHUNKED:
-            /* Number of dimensions (1 byte) */
-            assert(mesg->u.chunk.ndims > 0 && mesg->u.chunk.ndims <= H5O_LAYOUT_NDIMS);
-            ret_value++;
-
-            /* B-tree address */
-            ret_value += H5F_SIZEOF_ADDR(f);    /* Address of data */
-
-            /* Dimension sizes */
-            ret_value += mesg->u.chunk.ndims * 4;
-            break;
-
-        default:
-            HGOTO_ERROR(H5E_OHDR, H5E_CANTENCODE, 0, "Invalid layout class")
-    } /* end switch */
-
-done:
-    FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5O_layout_meta_size() */
-
-
-/*-------------------------------------------------------------------------
  * Function:    H5O_layout_size
  *
  * Purpose:     Returns the size of the raw message in bytes.  If it's
@@ -666,9 +604,6 @@ H5O_layout_copy_file(H5F_t *file_src, void *mesg_src, H5F_t *file_dst,
                     HGOTO_ERROR(H5E_IO, H5E_CANTINIT, NULL, "unable to copy chunked storage")
 
             	layout_dst->u.compact.dirty = TRUE;
-
-                /* Freed by copy routine */
-                udata->src_dtype = NULL;
 	    } /* end if */
             break;
 
@@ -685,23 +620,18 @@ H5O_layout_copy_file(H5F_t *file_src, void *mesg_src, H5F_t *file_dst,
                 /* create contig layout */
                 if(H5D_contig_copy(file_src, layout_src, file_dst, layout_dst, udata->src_dtype, cpy_info, dxpl_id) < 0)
                     HGOTO_ERROR(H5E_IO, H5E_CANTINIT, NULL, "unable to copy contiguous storage")
-
-                /* Freed by copy routine */
-                udata->src_dtype = NULL;
             } /*  if ( H5F_addr_defined(layout_src->u.contig.addr)) */
             break;
 
         case H5D_CHUNKED:
-            if(H5F_addr_defined(layout_src->u.chunk.addr)) {
-                /* layout is not created in the destination file, undef btree address */
-                layout_dst->u.chunk.addr = HADDR_UNDEF;
+            if(H5D_chunk_is_space_alloc(layout_src)) {
+                /* Layout is not created in the destination file, reset index address */
+                if(H5D_chunk_idx_reset(layout_dst) < 0)
+                    HGOTO_ERROR(H5E_IO, H5E_CANTINIT, NULL, "unable to reset chunked storage index in dest")
 
-                /* create chunked layout */
+                /* Create chunked layout */
                 if(H5D_chunk_copy(file_src, layout_src, file_dst, layout_dst, udata->src_dtype, cpy_info, udata->src_pline, dxpl_id) < 0)
                     HGOTO_ERROR(H5E_IO, H5E_CANTINIT, NULL, "unable to copy chunked storage")
-
-                /* Freed by copy routine */
-                udata->src_dtype = NULL;
             } /* if ( H5F_addr_defined(layout_srct->u.chunk.addr)) */
             break;
 
@@ -709,6 +639,9 @@ H5O_layout_copy_file(H5F_t *file_src, void *mesg_src, H5F_t *file_dst,
             HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, NULL, "Invalid layout class")
     } /* end switch */
 
+    /* Freed by copy routine */
+    udata->src_dtype = NULL;
+
     /* Set return value */
     ret_value = layout_dst;
 
@@ -742,7 +675,7 @@ H5O_layout_debug(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, const void *_mesg,
     const H5O_layout_t     *mesg = (const H5O_layout_t *) _mesg;
     unsigned                    u;
 
-    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5O_layout_debug);
+    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5O_layout_debug)
 
     /* check args */
     HDassert(f);
@@ -753,37 +686,121 @@ H5O_layout_debug(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, const void *_mesg,
 
     HDfprintf(stream, "%*s%-*s %u\n", indent, "", fwidth,
               "Version:", mesg->version);
-    if(mesg->type==H5D_CHUNKED) {
-        HDfprintf(stream, "%*s%-*s %s\n", indent, "", fwidth,
-                  "Type:", "Chunked");
-        HDfprintf(stream, "%*s%-*s %a\n", indent, "", fwidth,
-                  "B-tree address:", mesg->u.chunk.addr);
-        HDfprintf(stream, "%*s%-*s %lu\n", indent, "", fwidth,
-                  "Number of dimensions:",
-                  (unsigned long) (mesg->u.chunk.ndims));
-        /* Size */
-        HDfprintf(stream, "%*s%-*s {", indent, "", fwidth, "Size:");
-        for (u = 0; u < mesg->u.chunk.ndims; u++) {
-            HDfprintf(stream, "%s%lu", u ? ", " : "",
-                      (unsigned long) (mesg->u.chunk.dim[u]));
-        }
-        HDfprintf(stream, "}\n");
-    } /* end if */
-    else if(mesg->type==H5D_CONTIGUOUS) {
-        HDfprintf(stream, "%*s%-*s %s\n", indent, "", fwidth,
-                  "Type:", "Contiguous");
-        HDfprintf(stream, "%*s%-*s %a\n", indent, "", fwidth,
-                  "Data address:", mesg->u.contig.addr);
-        HDfprintf(stream, "%*s%-*s %Hu\n", indent, "", fwidth,
-                  "Data Size:", mesg->u.contig.size);
-    } /* end if */
-    else {
-        HDfprintf(stream, "%*s%-*s %s\n", indent, "", fwidth,
-                  "Type:", "Compact");
-        HDfprintf(stream, "%*s%-*s %Zu\n", indent, "", fwidth,
-                  "Data Size:", mesg->u.compact.size);
-    } /* end else */
+    switch(mesg->type) {
+        case H5D_CHUNKED:
+            HDfprintf(stream, "%*s%-*s %s\n", indent, "", fwidth,
+                      "Type:", "Chunked");
+
+            /* Chunk # of dims & size */
+            HDfprintf(stream, "%*s%-*s %lu\n", indent, "", fwidth,
+                      "Number of dimensions:",
+                      (unsigned long)(mesg->u.chunk.ndims));
+            HDfprintf(stream, "%*s%-*s {", indent, "", fwidth, "Size:");
+            for(u = 0; u < mesg->u.chunk.ndims; u++)
+                HDfprintf(stream, "%s%lu", u ? ", " : "", (unsigned long)(mesg->u.chunk.dim[u]));
+            HDfprintf(stream, "}\n");
+
+            /* Index information */
+            switch(mesg->u.chunk.idx_type) {
+                case H5D_CHUNK_BTREE:
+                    HDfprintf(stream, "%*s%-*s %s\n", indent, "", fwidth,
+                              "Index Type:", "v1 B-tree");
+                    HDfprintf(stream, "%*s%-*s %a\n", indent, "", fwidth,
+                              "B-tree address:", mesg->u.chunk.u.btree.addr);
+                    break;
+
+                default:
+                    HDfprintf(stream, "%*s%-*s %s (%u)\n", indent, "", fwidth,
+                              "Index Type:", "Unknown", (unsigned)mesg->u.chunk.idx_type);
+                    break;
+            } /* end switch */
+            break;
 
-    FUNC_LEAVE_NOAPI(SUCCEED);
+        case H5D_CONTIGUOUS:
+            HDfprintf(stream, "%*s%-*s %s\n", indent, "", fwidth,
+                      "Type:", "Contiguous");
+            HDfprintf(stream, "%*s%-*s %a\n", indent, "", fwidth,
+                      "Data address:", mesg->u.contig.addr);
+            HDfprintf(stream, "%*s%-*s %Hu\n", indent, "", fwidth,
+                      "Data Size:", mesg->u.contig.size);
+            break;
+
+        case H5D_COMPACT:
+            HDfprintf(stream, "%*s%-*s %s\n", indent, "", fwidth,
+                      "Type:", "Compact");
+            HDfprintf(stream, "%*s%-*s %Zu\n", indent, "", fwidth,
+                      "Data Size:", mesg->u.compact.size);
+            break;
+
+        default:
+            HDfprintf(stream, "%*s%-*s %s (%u)\n", indent, "", fwidth,
+                      "Type:", "Unknown", (unsigned)mesg->type);
+            break;
+    } /* end switch */
+
+    FUNC_LEAVE_NOAPI(SUCCEED)
 } /* end H5O_layout_debug() */
 
+
+/*-------------------------------------------------------------------------
+ * Function:    H5O_layout_meta_size
+ *
+ * Purpose:     Returns the size of the raw message in bytes except raw data
+ *              part for compact dataset.  This function doesn't take into
+ *              account message alignment.
+ *
+ * Return:      Success:        Message data size in bytes(except raw data
+ *                              for compact dataset)
+ *              Failure:        0
+ *
+ * Programmer:  Raymond Lu
+ *              August 14, 2002
+ *
+ *-------------------------------------------------------------------------
+ */
+size_t
+H5O_layout_meta_size(const H5F_t *f, const void *_mesg)
+{
+    const H5O_layout_t      *mesg = (const H5O_layout_t *) _mesg;
+    size_t                  ret_value;
+
+    FUNC_ENTER_NOAPI_NOINIT(H5O_layout_meta_size)
+
+    /* check args */
+    HDassert(f);
+    HDassert(mesg);
+
+    ret_value = 1 +                     /* Version number                       */
+                1;                      /* layout class type                    */
+
+    switch(mesg->type) {
+        case H5D_COMPACT:
+            /* Size of raw data */
+            ret_value += 2;
+            break;
+
+        case H5D_CONTIGUOUS:
+            ret_value += H5F_SIZEOF_ADDR(f);    /* Address of data */
+            ret_value += H5F_SIZEOF_SIZE(f);    /* Length of data */
+            break;
+
+        case H5D_CHUNKED:
+            /* Number of dimensions (1 byte) */
+            HDassert(mesg->u.chunk.ndims > 0 && mesg->u.chunk.ndims <= H5O_LAYOUT_NDIMS);
+            ret_value++;
+
+            /* Dimension sizes */
+            ret_value += mesg->u.chunk.ndims * 4;
+
+            /* B-tree address */
+            ret_value += H5F_SIZEOF_ADDR(f);    /* Address of data */
+            break;
+
+        default:
+            HGOTO_ERROR(H5E_OHDR, H5E_CANTENCODE, 0, "Invalid layout class")
+    } /* end switch */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5O_layout_meta_size() */
+
diff --git a/src/H5Oprivate.h b/src/H5Oprivate.h
index 39dfb5c..40bb096 100644
--- a/src/H5Oprivate.h
+++ b/src/H5Oprivate.h
@@ -349,13 +349,20 @@ typedef struct H5O_layout_contig_t {
     hsize_t     size;                   /* Size of data in bytes             */
 } H5O_layout_contig_t;
 
-typedef struct H5O_layout_chunk_t {
+typedef struct H5O_layout_chunk_btree_t {
     haddr_t	addr;			/* File address of B-tree            */
+    H5RC_t     *shared;			/* Ref-counted shared info for B-tree nodes */
+} H5O_layout_chunk_btree_t;
+
+typedef struct H5O_layout_chunk_t {
+    H5D_chunk_index_t idx_type;		/* Type of chunk index               */
     unsigned	ndims;			/* Num dimensions in chunk           */
     uint32_t	dim[H5O_LAYOUT_NDIMS];	/* Size of chunk in elements         */
     uint32_t    size;                   /* Size of chunk in bytes            */
-    H5RC_t     *btree_shared;           /* Ref-counted info for B-tree nodes */
     const struct H5D_chunk_ops_t *ops;  /* Pointer to chunked layout operations */
+    union {
+        H5O_layout_chunk_btree_t btree; /* Information for v1 B-tree index   */
+    } u;
 } H5O_layout_chunk_t;
 
 typedef struct H5O_layout_compact_t {
diff --git a/src/H5Pdcpl.c b/src/H5Pdcpl.c
index d84997a..43696fc 100644
--- a/src/H5Pdcpl.c
+++ b/src/H5Pdcpl.c
@@ -50,7 +50,7 @@
 /* Define default layout information */
 #define H5D_DEF_LAYOUT_COMPACT_INIT  {(hbool_t)FALSE, (size_t)0, NULL}
 #define H5D_DEF_LAYOUT_CONTIG_INIT   {HADDR_UNDEF, (hsize_t)0}
-#define H5D_DEF_LAYOUT_CHUNK_INIT    {HADDR_UNDEF, (unsigned)1, {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}, (uint32_t)0, NULL, NULL}
+#define H5D_DEF_LAYOUT_CHUNK_INIT    {H5D_CHUNK_BTREE, (unsigned)1, {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}, (uint32_t)0, NULL, {{HADDR_UNDEF, NULL}}}
 #ifdef H5_HAVE_C99_DESIGNATED_INITIALIZER
 #define H5D_DEF_LAYOUT_COMPACT  {H5D_COMPACT, H5O_LAYOUT_VERSION_3, NULL, { .compact = H5D_DEF_LAYOUT_COMPACT_INIT }}
 #define H5D_DEF_LAYOUT_CONTIG   {H5D_CONTIGUOUS, H5O_LAYOUT_VERSION_3, NULL, { .contig = H5D_DEF_LAYOUT_CONTIG_INIT }}
@@ -222,9 +222,6 @@ done:
  * Programmer:     Raymond Lu
  *                 Tuesday, October 2, 2001
  *
- * Modifications:  pvn, April 02, 2007
- *  Reset external file list slots name_offset to a state when created
- *
  *-------------------------------------------------------------------------
  */
 /* ARGSUSED */
@@ -277,9 +274,15 @@ H5P_dcrt_copy(hid_t dst_plist_id, hid_t src_plist_id, void UNUSED *copy_data)
             break;
 
         case H5D_CHUNKED:
-            dst_layout.u.chunk.addr = HADDR_UNDEF;
+            /* Reset chunk size */
             dst_layout.u.chunk.size = 0;
-            dst_layout.u.chunk.btree_shared = NULL;
+
+            /* Reset index info, if the chunk ops are set */
+            if(dst_layout.u.chunk.ops)
+                if(H5D_chunk_idx_reset(&dst_layout) < 0)
+                    HGOTO_ERROR(H5E_PLIST, H5E_CANTINIT, FAIL, "unable to reset chunked storage index in dest")
+
+            /* Reset chunk index ops */
             dst_layout.u.chunk.ops = NULL;
             break;