[svn-r1204] Changes since 19990415

----------------------

./config/depend.in
	Fixed automatic dependencies. We were storing dependencies for
	*.o files instead of *.lo files after shared libraries were
	added.

./config/gnu-flags
./config/linux-gnulibc1
	Moved `-march=pentiumpro -mcpu=pentiumpro -malign-double' from
	the linux file to this file and caused it to depend on the CPU
	name.  This fixes one of Elena's bugs.

./src/H5B.c
./src/H5Bprivate.h
./src/H5D.c
./src/H5Dprivate.h
./src/H5Dpublic.h
./src/H5F.c
./src/H5Farray.c
./src/H5Fistore.c
./src/H5Fmpio.c
./src/H5Fprivate.h
./src/H5Fpublic.h
./src/H5Gnode.c
./src/H5P.c
./src/H5RA.c
./src/H5Sall.c
./src/H5Shyper.c
./src/H5Smpio.c
./src/H5Spoint.c
./src/H5Sprivate.h
./src/H5Tpublic.h
./test/istore.c
	Added an H5Dget_storage_size() function that reports the
	amount of storage allocated for raw data in a dataset.

	Changed H5D_xfer_* to H5F_xfer_* because these properties are
	more general than datasets. This also allows some of the
	lower-level I/O functions to get this information easier.

./src/H5S.c
./src/H5Sall.c
	Added two new functions H5S_all_read() and H5S_all_write()
	which are optimizations that copy data directly between file
	and memory without having to go through the scatter gather
	step.  This knocks quite a bit of time off the I/O and
	reading/writing entire datasets is a fairly common operation.

./tools/h5ls.c
	Reports the logical size of data, the allocated size of data,
	and the percent utilization.

./MANIFEST
	Removed old pablo files, added new files. Snapshots should now
	start to work again.

./src/H5D.c
./src/H5Fmpio.c
	Removed two warnings signed vs. unsigned comparisons and check
	for overflow.

22 files changed, 617 insertions, 199 deletions

diff --git a/src/H5B.c b/src/H5B.c
index 09bb967..ffc829e 100644
--- a/src/H5B.c
+++ b/src/H5B.c
@@ -1482,6 +1482,8 @@ H5B_insert_helper(H5F_t *f, const haddr_t *addr, const H5B_class_t *type,
  *		Jun 23 1997
  *
  * Modifications:
+ * 		Robb Matzke, 1999-04-21
+ *		The key values are passed to the function which is called.
  *
  *-------------------------------------------------------------------------
  */
@@ -1493,6 +1495,7 @@ H5B_iterate (H5F_t *f, const H5B_class_t *type, const haddr_t *addr,
     haddr_t		next_addr;
     const haddr_t	*cur_addr = NULL;
     haddr_t		*child = NULL;
+    uint8_t		*key = NULL;
     intn		i, nchildren;
     herr_t		ret_value = FAIL;
 
@@ -1507,7 +1510,7 @@ H5B_iterate (H5F_t *f, const H5B_class_t *type, const haddr_t *addr,
     assert(addr && H5F_addr_defined(addr));
     assert(udata);
 
-    if (NULL == (bt = H5AC_find(f, H5AC_BT, addr, type, udata))) {
+    if (NULL == (bt=H5AC_find(f, H5AC_BT, addr, type, udata))) {
 	HGOTO_ERROR(H5E_BTREE, H5E_CANTLOAD, FAIL,
 		    "unable to load B-tree node");
     }
@@ -1524,7 +1527,8 @@ H5B_iterate (H5F_t *f, const H5B_class_t *type, const haddr_t *addr,
 	 * We've reached the left-most leaf.  Now follow the right-sibling
 	 * pointer from leaf to leaf until we've processed all leaves.
 	 */
-	if (NULL==(child = H5MM_malloc (2*H5B_K(f,type)*sizeof(haddr_t)))) {
+	if (NULL==(child=H5MM_malloc(2*H5B_K(f,type)*sizeof(haddr_t))) ||
+	    NULL==(key=H5MM_malloc((2*H5B_K(f, type)+1)*type->sizeof_nkey))) {
 	    HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL,
 			 "memory allocation failed");
 	}
@@ -1533,8 +1537,9 @@ H5B_iterate (H5F_t *f, const H5B_class_t *type, const haddr_t *addr,
 	     cur_addr=&next_addr) {
 
 	    /*
-	     * Save all the child addresses since we can't leave the B-tree
-	     * node protected during an application callback.
+	     * Save all the child addresses and native keys since we can't
+	     * leave the B-tree node protected during an application
+	     * callback.
 	     */
 	    if (NULL==(bt=H5AC_find (f, H5AC_BT, cur_addr, type, udata))) {
 		HGOTO_ERROR (H5E_BTREE, H5E_CANTLOAD, FAIL, "B-tree node");
@@ -1542,6 +1547,11 @@ H5B_iterate (H5F_t *f, const H5B_class_t *type, const haddr_t *addr,
 	    for (i=0; i<bt->nchildren; i++) {
 		child[i] = bt->child[i];
 	    }
+	    for (i=0; i<bt->nchildren+1; i++) {
+		H5B_decode_key(f, bt, i);
+		memcpy(key+i*type->sizeof_nkey, bt->key[i].nkey,
+		       type->sizeof_nkey);
+	    }
 	    next_addr = bt->right;
 	    nchildren = bt->nchildren;
 	    bt = NULL;
@@ -1551,10 +1561,13 @@ H5B_iterate (H5F_t *f, const H5B_class_t *type, const haddr_t *addr,
 	     * application  callback.
 	     */
 	    for (i=0, ret_value=0; i<nchildren && !ret_value; i++) {
-		ret_value = (type->list)(f, child+i, udata);
+		ret_value = (type->list)(f, key+i*type->sizeof_nkey,
+					 child+i, key+(i+1)*type->sizeof_nkey,
+					 udata);
 	    }
 	}
-	H5MM_xfree (child);
+	H5MM_xfree(child);
+	H5MM_xfree(key);
     }
 
   done:
diff --git a/src/H5Bprivate.h b/src/H5Bprivate.h
index 4cdfd9e..8dcbaea 100644
--- a/src/H5Bprivate.h
+++ b/src/H5Bprivate.h
@@ -87,8 +87,11 @@ typedef struct H5B_class_t {
     /* remove existing data */
     H5B_ins_t	(*remove)(H5F_t*, const haddr_t*, void*, hbool_t*,
 			  void*, void*, hbool_t*);
-    
-    herr_t	(*list)(H5F_t*, const haddr_t*, void*); /*walk leaf nodes*/
+
+    /* iterate through the leaf nodes */
+    herr_t	(*list)(H5F_t*, void*, const haddr_t*, void*, void*);
+
+    /* encode, decode, debug key values */
     herr_t	(*decode)(H5F_t*, struct H5B_t*, uint8_t*, void*);
     herr_t	(*encode)(H5F_t*, struct H5B_t*, uint8_t*, void*);
     herr_t	(*debug_key)(FILE*, intn, intn, const void*, const void*);
diff --git a/src/H5D.c b/src/H5D.c
index 656b7a5..03fce3d 100644
--- a/src/H5D.c
+++ b/src/H5D.c
@@ -66,28 +66,6 @@ const H5D_create_t	H5D_create_dflt = {
     {0, 0, NULL} 		/* No filters in pipeline		*/
 };
 
-/* Default dataset transfer property list */
-const H5D_xfer_t	H5D_xfer_dflt = {
-    1024*1024,			/* Temporary buffer size		*/
-    NULL,			/* Type conversion buffer or NULL	*/
-    NULL, 			/* Background buffer or NULL		*/
-    H5T_BKG_NO,			/* Type of background buffer needed	*/
-    {0.1, 0.5, 0.9},		/* B-tree node splitting ratios		*/
-#ifndef HAVE_PARALLEL
-    1,				/* Cache the hyperslab blocks by default*/
-#else
-    0,				/*
-				 * Don't cache the hyperslab blocks by
-				 * default (for parallel)
-				 */
-#endif /* HAVE_PARALLEL */
-    0,              		/*
-				 * Default to no upper limit on hyperslab
-				 * block size to cache
-				 */
-    H5D_XFER_DFLT,      	/* Independent data transfer      	*/
-};
-
 /* Interface initialization? */
 static intn interface_initialize_g = 0;
 #define INTERFACE_INIT H5D_init_interface
@@ -604,7 +582,7 @@ H5Dread(hid_t dset_id, hid_t mem_type_id, hid_t mem_space_id,
     const H5T_t		   *mem_type = NULL;
     const H5S_t		   *mem_space = NULL;
     const H5S_t		   *file_space = NULL;
-    const H5D_xfer_t	   *xfer_parms = NULL;
+    const H5F_xfer_t	   *xfer_parms = NULL;
 
     FUNC_ENTER(H5Dread, FAIL);
     H5TRACE6("e","iiiiix",dset_id,mem_type_id,mem_space_id,file_space_id,
@@ -643,7 +621,7 @@ H5Dread(hid_t dset_id, hid_t mem_type_id, hid_t mem_space_id,
 	}
     }
     if (H5P_DEFAULT == plist_id) {
-	xfer_parms = &H5D_xfer_dflt;
+	xfer_parms = &H5F_xfer_dflt;
     } else if (H5P_DATASET_XFER != H5P_get_class(plist_id) ||
 	       NULL == (xfer_parms = H5I_object(plist_id))) {
 	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not xfer parms");
@@ -703,7 +681,7 @@ H5Dwrite(hid_t dset_id, hid_t mem_type_id, hid_t mem_space_id,
     const H5T_t		   *mem_type = NULL;
     const H5S_t		   *mem_space = NULL;
     const H5S_t		   *file_space = NULL;
-    const H5D_xfer_t	   *xfer_parms = NULL;
+    const H5F_xfer_t	   *xfer_parms = NULL;
 
     FUNC_ENTER(H5Dwrite, FAIL);
     H5TRACE6("e","iiiiix",dset_id,mem_type_id,mem_space_id,file_space_id,
@@ -742,7 +720,7 @@ H5Dwrite(hid_t dset_id, hid_t mem_type_id, hid_t mem_space_id,
 	}
     }
     if (H5P_DEFAULT == plist_id) {
-	xfer_parms = &H5D_xfer_dflt;
+	xfer_parms = &H5F_xfer_dflt;
     } else if (H5P_DATASET_XFER != H5P_get_class(plist_id) ||
 	       NULL == (xfer_parms = H5I_object(plist_id))) {
 	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not xfer parms");
@@ -784,9 +762,9 @@ H5Dextend(hid_t dset_id, const hsize_t *size)
     H5TRACE2("e","i*h",dset_id,size);
 
     /* Check args */
-    if (H5I_DATASET!=H5I_get_type (dset_id) ||
-	NULL==(dset=H5I_object (dset_id))) {
-	HRETURN_ERROR (H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset");
+    if (H5I_DATASET!=H5I_get_type(dset_id) ||
+	NULL==(dset=H5I_object(dset_id))) {
+	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset");
     }
     if (!size) {
 	HRETURN_ERROR (H5E_ARGS, H5E_BADVALUE, FAIL, "no size specified");
@@ -846,7 +824,7 @@ H5D_new(const H5D_create_t *create_parms)
 
 done:
     FUNC_LEAVE(ret_value);
-}   /* end H5D_new() */
+}
 
 
 /*-------------------------------------------------------------------------
@@ -1211,7 +1189,7 @@ H5D_open(H5G_entry_t *loc, const char *name)
 
 done:
     FUNC_LEAVE(ret_value);
-}   /* end H5D_open() */
+}
 
 /*-------------------------------------------------------------------------
  * Function:	H5D_open_oid
@@ -1364,7 +1342,7 @@ done:
         H5MM_xfree(dataset);
     }
     FUNC_LEAVE(ret_value);
-}   /* end H5D_open_oid() */
+}
 
 /*-------------------------------------------------------------------------
  * Function:	H5D_close
@@ -1451,7 +1429,7 @@ H5D_close(H5D_t *dataset)
  */
 herr_t
 H5D_read(H5D_t *dataset, const H5T_t *mem_type, const H5S_t *mem_space,
-	 const H5S_t *file_space, const H5D_xfer_t *xfer_parms,
+	 const H5S_t *file_space, const H5F_xfer_t *xfer_parms,
 	 void *buf/*out*/)
 {
     hssize_t    	nelmts;			/*number of elements	*/
@@ -1570,8 +1548,8 @@ H5D_read(H5D_t *dataset, const H5T_t *mem_type, const H5S_t *mem_space,
 			       &(dataset->create_parms->pline),
 			       &(dataset->create_parms->efl),
 			       H5T_get_size (dataset->type), file_space,
-			       mem_space, xfer_parms->xfer_mode,
-			       buf/*out*/, &must_convert );
+			       mem_space, xfer_parms, buf/*out*/,
+			       &must_convert);
         if (status<0) {
 	    /* Supports only no conversion, type or space, for now. */
 	    HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL,
@@ -1655,7 +1633,10 @@ H5D_read(H5D_t *dataset, const H5T_t *mem_type, const H5S_t *mem_space,
 #endif
     
     /* Start strip mining... */
-    for (smine_start=0; smine_start<nelmts; smine_start+=smine_nelmts) {
+    assert(nelmts==(hssize_t)(size_t)nelmts); /*check for overflow*/
+    for (smine_start=0;
+	 smine_start<(size_t)nelmts;
+	 smine_start+=smine_nelmts) {
         /* Go figure out how many elements to read from the file */
         smine_nelmts = (sconv->f->avail)(file_space,&file_iter,
 					 MIN(request_nelmts,
@@ -1803,7 +1784,7 @@ H5D_read(H5D_t *dataset, const H5T_t *mem_type, const H5S_t *mem_space,
  */
 herr_t
 H5D_write(H5D_t *dataset, const H5T_t *mem_type, const H5S_t *mem_space,
-	  const H5S_t *file_space, const H5D_xfer_t *xfer_parms,
+	  const H5S_t *file_space, const H5F_xfer_t *xfer_parms,
 	  const void *buf)
 {
     hssize_t		nelmts;			/*total number of elmts	*/
@@ -1934,8 +1915,8 @@ H5D_write(H5D_t *dataset, const H5T_t *mem_type, const H5S_t *mem_space,
 				&(dataset->create_parms->pline),
 				&(dataset->create_parms->efl),
 				H5T_get_size (dataset->type), file_space,
-				mem_space, xfer_parms->xfer_mode, buf,
-				&must_convert /*out*/ );
+				mem_space, xfer_parms, buf,
+				&must_convert/*out*/);
         if (status<0) {
 	    /* Supports only no conversion, type or space, for now. */
 	    HGOTO_ERROR(H5E_DATASET, H5E_READERROR, FAIL,
@@ -2020,7 +2001,10 @@ H5D_write(H5D_t *dataset, const H5T_t *mem_type, const H5S_t *mem_space,
 #endif
 
     /* Start strip mining... */
-    for (smine_start=0; smine_start<nelmts; smine_start+=smine_nelmts) {
+    assert(nelmts==(hssize_t)(size_t)nelmts); /*check for overflow*/
+    for (smine_start=0;
+	 smine_start<(size_t)nelmts;
+	 smine_start+=smine_nelmts) {
         /* Go figure out how many elements to read from the file */
         smine_nelmts = (sconv->f->avail)(file_space,&file_iter,
 					 MIN(request_nelmts,
@@ -2422,7 +2406,7 @@ H5D_init_storage(H5D_t *dset, const H5S_t *space)
 	    ndims++;
 
 	    if (H5F_istore_allocate(dset->ent.file, &(dset->layout),
-				    dim, H5D_xfer_dflt.split_ratios,
+				    dim, H5F_xfer_dflt.split_ratios,
 				    &(dset->create_parms->pline),
 				    &(dset->create_parms->fill))<0) {
 		HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL,
@@ -2441,3 +2425,80 @@ H5D_init_storage(H5D_t *dset, const H5S_t *space)
     FUNC_LEAVE(ret_value);
 }
 
+
+/*-------------------------------------------------------------------------
+ * Function:	H5Dget_storage_size
+ *
+ * Purpose:	Returns the amount of storage that is required for the
+ *		dataset. For chunked datasets this is the number of allocated
+ *		chunks times the chunk size.
+ *
+ * Return:	Success:	The amount of storage space allocated for the
+ *				dataset, not counting meta data. The return
+ *				value may be zero if no data has been stored.
+ *
+ *		Failure:	Zero
+ *
+ * Programmer:	Robb Matzke
+ *              Wednesday, April 21, 1999
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+hsize_t
+H5Dget_storage_size(hid_t dset_id)
+{
+    H5D_t	*dset=NULL;
+    hsize_t	size;
+    
+    FUNC_ENTER(H5Dget_storage_size, 0);
+    H5TRACE1("h","i",dset_id);
+
+    /* Check args */
+    if (H5I_DATASET!=H5I_get_type(dset_id) ||
+	NULL==(dset=H5I_object(dset_id))) {
+	HRETURN_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset");
+    }
+
+    size = H5D_get_storage_size(dset);
+    FUNC_LEAVE(size);
+}
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5D_get_storage_size
+ *
+ * Purpose:	Determines how much space has been reserved to store the raw
+ *		data of a dataset.
+ *
+ * Return:	Success:	Number of bytes reserved to hold raw data.
+ *
+ *		Failure:	0
+ *
+ * Programmer:	Robb Matzke
+ *              Wednesday, April 21, 1999
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+hsize_t
+H5D_get_storage_size(H5D_t *dset)
+{
+    hsize_t	size;
+    int		i;
+    
+    FUNC_ENTER(H5D_get_storage_size, 0);
+
+    if (H5D_CHUNKED==dset->layout.type) {
+	size = H5F_istore_allocated(dset->ent.file, dset->layout.ndims,
+				    &(dset->layout.addr));
+    } else {
+	for (i=0, size=1; i<dset->layout.ndims; i++) {
+	    size *= dset->layout.dim[i];
+	}
+    }
+	
+    FUNC_LEAVE(size);
+}
diff --git a/src/H5Distore.c b/src/H5Distore.c
index 89e262b..d3435a9 100644
--- a/src/H5Distore.c
+++ b/src/H5Distore.c
@@ -108,6 +108,9 @@ static H5B_ins_t H5F_istore_insert(H5F_t *f, const haddr_t *addr,
 				   void *_md_key, void *_udata,
 				   void *_rt_key, hbool_t *rt_key_changed,
 				   haddr_t *new_node/*out*/);
+static herr_t H5F_istore_iterate (H5F_t *f, void *left_key,
+				  const haddr_t *addr, void *right_key,
+				  void *_udata);
 static herr_t H5F_istore_decode_key(H5F_t *f, H5B_t *bt, uint8_t *raw,
 				    void *_key);
 static herr_t H5F_istore_encode_key(H5F_t *f, H5B_t *bt, uint8_t *raw,
@@ -143,6 +146,7 @@ typedef struct H5F_istore_ud1_t {
     H5F_istore_key_t	key;			/*key values		*/
     haddr_t		addr;			/*file address of chunk */
     H5O_layout_t	mesg;			/*layout message	*/
+    hsize_t		total_storage;		/*output from iterator	*/
 } H5F_istore_ud1_t;
 
 /* inherits B-tree like properties from H5B */
@@ -158,7 +162,7 @@ H5B_class_t H5B_ISTORE[1] = {{
     FALSE,					/*follow min branch?	*/
     FALSE,					/*follow max branch?	*/
     NULL,					/*remove		*/
-    NULL,					/*list			*/
+    H5F_istore_iterate,				/*iterator		*/
     H5F_istore_decode_key,			/*decode		*/
     H5F_istore_encode_key,			/*encode		*/
     H5F_istore_debug_key,			/*debug			*/
@@ -718,6 +722,36 @@ H5F_istore_insert(H5F_t *f, const haddr_t *addr, void *_lt_key,
 
 
 /*-------------------------------------------------------------------------
+ * Function:	H5F_istore_iterate
+ *
+ * Purpose:	Simply counts the number of chunks for a dataset.
+ *
+ * Return:	Success:	Non-negative
+ *
+ *		Failure:	Negative
+ *
+ * Programmer:	Robb Matzke
+ *              Wednesday, April 21, 1999
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5F_istore_iterate (H5F_t UNUSED *f, void *_lt_key,
+		    const haddr_t UNUSED *addr,
+		    void UNUSED *_rt_key, void *_udata)
+{
+    H5F_istore_ud1_t	*bt_udata = (H5F_istore_ud1_t *)_udata;
+    H5F_istore_key_t	*lt_key = (H5F_istore_key_t *)_lt_key;
+
+    FUNC_ENTER(H5F_istore_iterate, FAIL);
+    bt_udata->total_storage += lt_key->nbytes;
+    FUNC_LEAVE(SUCCEED);
+}
+
+
+/*-------------------------------------------------------------------------
  * Function:	H5F_istore_init
  *
  * Purpose:	Initialize the raw data chunk cache for a file.  This is
@@ -1513,7 +1547,7 @@ H5F_istore_unlock (H5F_t *f, const H5O_layout_t *layout,
  *-------------------------------------------------------------------------
  */
 herr_t
-H5F_istore_read(H5F_t *f, const H5D_xfer_t *xfer, const H5O_layout_t *layout,
+H5F_istore_read(H5F_t *f, const H5F_xfer_t *xfer, const H5O_layout_t *layout,
 		const H5O_pline_t *pline, const H5O_fill_t *fill,
 		const hssize_t offset_f[], const hsize_t size[], void *buf)
 {
@@ -1601,7 +1635,7 @@ H5F_istore_read(H5F_t *f, const H5D_xfer_t *xfer, const H5O_layout_t *layout,
 	 if (f->shared->access_parms->driver==H5F_LOW_MPIO){
 	    H5F_istore_ud1_t	udata;
 	    H5O_layout_t	l;	/* temporary layout */
-	    H5D_xfer_t		tmp_xfer = *xfer;
+	    H5F_xfer_t		tmp_xfer = *xfer;
 	    if (H5F_istore_get_addr(f, layout, chunk_offset, &udata)<0){
 		HRETURN_ERROR (H5E_IO, H5E_WRITEERROR, FAIL,
 				"unable to locate raw data chunk");
@@ -1683,7 +1717,7 @@ H5F_istore_read(H5F_t *f, const H5D_xfer_t *xfer, const H5O_layout_t *layout,
  *-------------------------------------------------------------------------
  */
 herr_t
-H5F_istore_write(H5F_t *f, const H5D_xfer_t *xfer, const H5O_layout_t *layout,
+H5F_istore_write(H5F_t *f, const H5F_xfer_t *xfer, const H5O_layout_t *layout,
 		 const H5O_pline_t *pline, const H5O_fill_t *fill,
 		 const hssize_t offset_f[], const hsize_t size[],
 		 const void *buf)
@@ -1776,7 +1810,7 @@ H5F_istore_write(H5F_t *f, const H5D_xfer_t *xfer, const H5O_layout_t *layout,
 	 if (f->shared->access_parms->driver==H5F_LOW_MPIO){
 	    H5F_istore_ud1_t	udata;
 	    H5O_layout_t	l;	/* temporary layout */
-	    H5D_xfer_t		tmp_xfer = *xfer;
+	    H5F_xfer_t		tmp_xfer = *xfer;
 	    if (H5F_istore_get_addr(f, layout, chunk_offset, &udata)<0){
 		HRETURN_ERROR (H5E_IO, H5E_WRITEERROR, FAIL,
 				"unable to locate raw data chunk");
@@ -1895,6 +1929,40 @@ H5F_istore_create(H5F_t *f, H5O_layout_t *layout /*out */ )
 
 
 /*-------------------------------------------------------------------------
+ * Function:	H5F_istore_allocated
+ *
+ * Purpose:	Return the number of bytes allocated in the file for storage
+ *		of raw data under the specified B-tree (ADDR is the address
+ *		of the B-tree).
+ *
+ * Return:	Success:	Number of bytes stored in all chunks.
+ *
+ *		Failure:	0
+ *
+ * Programmer:	Robb Matzke
+ *              Wednesday, April 21, 1999
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+hsize_t
+H5F_istore_allocated(H5F_t *f, int ndims, haddr_t *addr)
+{
+    H5F_istore_ud1_t	udata;
+
+    FUNC_ENTER(H5F_istore_nchunks, 0);
+    udata.mesg.ndims = ndims;
+    udata.total_storage = 0;
+    if (H5B_iterate(f, H5B_ISTORE, addr, &udata)<0) {
+	HRETURN_ERROR(H5E_IO, H5E_INTERNAL, 0,
+		      "unable to iterate over chunk B-tree");
+    }
+    FUNC_LEAVE(udata.total_storage);
+}
+
+
+/*-------------------------------------------------------------------------
  * Function:	H5F_istore_stats
  *
  * Purpose:	Print raw data cache statistics to the debug stream.  If
diff --git a/src/H5Dprivate.h b/src/H5Dprivate.h
index 7ce4dbc..e420619 100644
--- a/src/H5Dprivate.h
+++ b/src/H5Dprivate.h
@@ -50,21 +50,8 @@ typedef struct H5D_create_t {
     H5O_pline_t		pline;		/*data filter pipeline		     */
 } H5D_create_t;
 
-/* Dataset transfer property list */
-typedef struct H5D_xfer_t {
-    size_t		buf_size;	/*max temp buffer size		     */
-    void		*tconv_buf;	/*type conversion buffer or null     */
-    void		*bkg_buf;	/*background buffer or null	     */
-    H5T_bkg_t		need_bkg;	/*type of background buffer needed   */
-    double		split_ratios[3];/*B-tree node splitting ratios	     */
-    uintn       	cache_hyper;    /*cache hyperslab blocks during I/O? */
-    uintn       	block_limit;    /*largest hyperslab block to cache   */
-    H5D_transfer_t	xfer_mode;	/*independent or collective transfer */
-} H5D_xfer_t;
-
 typedef struct H5D_t H5D_t;
 __DLLVAR__ const H5D_create_t H5D_create_dflt;
-__DLLVAR__ const H5D_xfer_t H5D_xfer_dflt;
 
 /* Functions defined in H5D.c */
 __DLL__ H5D_t *H5D_create(H5G_entry_t *loc, const char *name,
@@ -75,15 +62,16 @@ __DLL__ herr_t H5D_close(H5D_t *dataset);
 __DLL__ htri_t H5D_isa(H5G_entry_t *ent);
 __DLL__ herr_t H5D_read(H5D_t *dataset, const H5T_t *mem_type,
 			const H5S_t *mem_space, const H5S_t *file_space,
-			const H5D_xfer_t *xfer_parms, void *buf/*out*/);
+			const H5F_xfer_t *xfer_parms, void *buf/*out*/);
 __DLL__ herr_t H5D_write(H5D_t *dataset, const H5T_t *mem_type,
 			 const H5S_t *mem_space, const H5S_t *file_space,
-			 const H5D_xfer_t *xfer_parms, const void *buf);
+			 const H5F_xfer_t *xfer_parms, const void *buf);
 __DLL__ herr_t H5D_extend(H5D_t *dataset, const hsize_t *size);
 __DLL__ H5G_entry_t *H5D_entof(H5D_t *dataset);
 __DLL__ H5T_t *H5D_typeof(H5D_t *dset);
 __DLL__ H5S_t *H5D_get_space(H5D_t *dset);
 __DLL__ H5D_t * H5D_open_oid(H5G_entry_t *ent);
 __DLL__ H5F_t * H5D_get_file(const H5D_t *dset);
+__DLL__ hsize_t H5D_get_storage_size(H5D_t *dset);
 
 #endif
diff --git a/src/H5Dpublic.h b/src/H5Dpublic.h
index 9e6cba3..6130715 100644
--- a/src/H5Dpublic.h
+++ b/src/H5Dpublic.h
@@ -50,6 +50,7 @@ __DLL__ herr_t H5Dclose (hid_t dset_id);
 __DLL__ hid_t H5Dget_space (hid_t dset_id);
 __DLL__ hid_t H5Dget_type (hid_t dset_id);
 __DLL__ hid_t H5Dget_create_plist (hid_t dset_id);
+__DLL__ hsize_t H5Dget_storage_size(hid_t dset_id);
 __DLL__ herr_t H5Dread (hid_t dset_id, hid_t mem_type_id, hid_t mem_space_id,
 			hid_t file_space_id, hid_t plist_id, void *buf/*out*/);
 __DLL__ herr_t H5Dwrite (hid_t dset_id, hid_t mem_type_id, hid_t mem_space_id,
diff --git a/src/H5F.c b/src/H5F.c
index 42884cf..f74745a 100644
--- a/src/H5F.c
+++ b/src/H5F.c
@@ -65,6 +65,28 @@ const H5F_create_t	H5F_create_dflt = {
  */
 H5F_access_t H5F_access_dflt;
 
+/* Default data transfer property list */
+const H5F_xfer_t	H5F_xfer_dflt = {
+    1024*1024,			/* Temporary buffer size		*/
+    NULL,			/* Type conversion buffer or NULL	*/
+    NULL, 			/* Background buffer or NULL		*/
+    H5T_BKG_NO,			/* Type of background buffer needed	*/
+    {0.1, 0.5, 0.9},		/* B-tree node splitting ratios		*/
+#ifndef HAVE_PARALLEL
+    1,				/* Cache the hyperslab blocks by default*/
+#else
+    0,				/*
+				 * Don't cache the hyperslab blocks by
+				 * default (for parallel)
+				 */
+#endif /* HAVE_PARALLEL */
+    0,              		/*
+				 * Default to no upper limit on hyperslab
+				 * block size to cache
+				 */
+    H5D_XFER_DFLT,      	/* Independent data transfer      	*/
+};
+
 /*
  * Define the default mount property list.
  */
diff --git a/src/H5Farray.c b/src/H5Farray.c
index 88423ca..3141007 100644
--- a/src/H5Farray.c
+++ b/src/H5Farray.c
@@ -113,7 +113,7 @@ H5F_arr_create (H5F_t *f, struct H5O_layout_t *layout/*in,out*/)
  *-------------------------------------------------------------------------
  */
 herr_t
-H5F_arr_read (H5F_t *f, const H5D_xfer_t *xfer,
+H5F_arr_read (H5F_t *f, const H5F_xfer_t *xfer,
 	      const struct H5O_layout_t *layout,
 	      const struct H5O_pline_t *pline, const H5O_fill_t *fill,
 	      const struct H5O_efl_t *efl, const hsize_t _hslab_size[],
@@ -330,12 +330,12 @@ H5F_arr_read (H5F_t *f, const H5D_xfer_t *xfer,
  *
  * 		Sep 28, 1998	Robb Matzke
  *		Added `xfer' argument, removed `xfer_mode' argument since it
- *		is a member of H5D_xfer_t.
+ *		is a member of H5F_xfer_t.
  *
  *-------------------------------------------------------------------------
  */
 herr_t
-H5F_arr_write (H5F_t *f, const H5D_xfer_t *xfer,
+H5F_arr_write (H5F_t *f, const H5F_xfer_t *xfer,
 	       const struct H5O_layout_t *layout,
 	       const struct H5O_pline_t *pline,
 	       const struct H5O_fill_t *fill, const struct H5O_efl_t *efl,
diff --git a/src/H5Fistore.c b/src/H5Fistore.c
index 89e262b..d3435a9 100644
--- a/src/H5Fistore.c
+++ b/src/H5Fistore.c
@@ -108,6 +108,9 @@ static H5B_ins_t H5F_istore_insert(H5F_t *f, const haddr_t *addr,
 				   void *_md_key, void *_udata,
 				   void *_rt_key, hbool_t *rt_key_changed,
 				   haddr_t *new_node/*out*/);
+static herr_t H5F_istore_iterate (H5F_t *f, void *left_key,
+				  const haddr_t *addr, void *right_key,
+				  void *_udata);
 static herr_t H5F_istore_decode_key(H5F_t *f, H5B_t *bt, uint8_t *raw,
 				    void *_key);
 static herr_t H5F_istore_encode_key(H5F_t *f, H5B_t *bt, uint8_t *raw,
@@ -143,6 +146,7 @@ typedef struct H5F_istore_ud1_t {
     H5F_istore_key_t	key;			/*key values		*/
     haddr_t		addr;			/*file address of chunk */
     H5O_layout_t	mesg;			/*layout message	*/
+    hsize_t		total_storage;		/*output from iterator	*/
 } H5F_istore_ud1_t;
 
 /* inherits B-tree like properties from H5B */
@@ -158,7 +162,7 @@ H5B_class_t H5B_ISTORE[1] = {{
     FALSE,					/*follow min branch?	*/
     FALSE,					/*follow max branch?	*/
     NULL,					/*remove		*/
-    NULL,					/*list			*/
+    H5F_istore_iterate,				/*iterator		*/
     H5F_istore_decode_key,			/*decode		*/
     H5F_istore_encode_key,			/*encode		*/
     H5F_istore_debug_key,			/*debug			*/
@@ -718,6 +722,36 @@ H5F_istore_insert(H5F_t *f, const haddr_t *addr, void *_lt_key,
 
 
 /*-------------------------------------------------------------------------
+ * Function:	H5F_istore_iterate
+ *
+ * Purpose:	Simply counts the number of chunks for a dataset.
+ *
+ * Return:	Success:	Non-negative
+ *
+ *		Failure:	Negative
+ *
+ * Programmer:	Robb Matzke
+ *              Wednesday, April 21, 1999
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5F_istore_iterate (H5F_t UNUSED *f, void *_lt_key,
+		    const haddr_t UNUSED *addr,
+		    void UNUSED *_rt_key, void *_udata)
+{
+    H5F_istore_ud1_t	*bt_udata = (H5F_istore_ud1_t *)_udata;
+    H5F_istore_key_t	*lt_key = (H5F_istore_key_t *)_lt_key;
+
+    FUNC_ENTER(H5F_istore_iterate, FAIL);
+    bt_udata->total_storage += lt_key->nbytes;
+    FUNC_LEAVE(SUCCEED);
+}
+
+
+/*-------------------------------------------------------------------------
  * Function:	H5F_istore_init
  *
  * Purpose:	Initialize the raw data chunk cache for a file.  This is
@@ -1513,7 +1547,7 @@ H5F_istore_unlock (H5F_t *f, const H5O_layout_t *layout,
  *-------------------------------------------------------------------------
  */
 herr_t
-H5F_istore_read(H5F_t *f, const H5D_xfer_t *xfer, const H5O_layout_t *layout,
+H5F_istore_read(H5F_t *f, const H5F_xfer_t *xfer, const H5O_layout_t *layout,
 		const H5O_pline_t *pline, const H5O_fill_t *fill,
 		const hssize_t offset_f[], const hsize_t size[], void *buf)
 {
@@ -1601,7 +1635,7 @@ H5F_istore_read(H5F_t *f, const H5D_xfer_t *xfer, const H5O_layout_t *layout,
 	 if (f->shared->access_parms->driver==H5F_LOW_MPIO){
 	    H5F_istore_ud1_t	udata;
 	    H5O_layout_t	l;	/* temporary layout */
-	    H5D_xfer_t		tmp_xfer = *xfer;
+	    H5F_xfer_t		tmp_xfer = *xfer;
 	    if (H5F_istore_get_addr(f, layout, chunk_offset, &udata)<0){
 		HRETURN_ERROR (H5E_IO, H5E_WRITEERROR, FAIL,
 				"unable to locate raw data chunk");
@@ -1683,7 +1717,7 @@ H5F_istore_read(H5F_t *f, const H5D_xfer_t *xfer, const H5O_layout_t *layout,
  *-------------------------------------------------------------------------
  */
 herr_t
-H5F_istore_write(H5F_t *f, const H5D_xfer_t *xfer, const H5O_layout_t *layout,
+H5F_istore_write(H5F_t *f, const H5F_xfer_t *xfer, const H5O_layout_t *layout,
 		 const H5O_pline_t *pline, const H5O_fill_t *fill,
 		 const hssize_t offset_f[], const hsize_t size[],
 		 const void *buf)
@@ -1776,7 +1810,7 @@ H5F_istore_write(H5F_t *f, const H5D_xfer_t *xfer, const H5O_layout_t *layout,
 	 if (f->shared->access_parms->driver==H5F_LOW_MPIO){
 	    H5F_istore_ud1_t	udata;
 	    H5O_layout_t	l;	/* temporary layout */
-	    H5D_xfer_t		tmp_xfer = *xfer;
+	    H5F_xfer_t		tmp_xfer = *xfer;
 	    if (H5F_istore_get_addr(f, layout, chunk_offset, &udata)<0){
 		HRETURN_ERROR (H5E_IO, H5E_WRITEERROR, FAIL,
 				"unable to locate raw data chunk");
@@ -1895,6 +1929,40 @@ H5F_istore_create(H5F_t *f, H5O_layout_t *layout /*out */ )
 
 
 /*-------------------------------------------------------------------------
+ * Function:	H5F_istore_allocated
+ *
+ * Purpose:	Return the number of bytes allocated in the file for storage
+ *		of raw data under the specified B-tree (ADDR is the address
+ *		of the B-tree).
+ *
+ * Return:	Success:	Number of bytes stored in all chunks.
+ *
+ *		Failure:	0
+ *
+ * Programmer:	Robb Matzke
+ *              Wednesday, April 21, 1999
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+hsize_t
+H5F_istore_allocated(H5F_t *f, int ndims, haddr_t *addr)
+{
+    H5F_istore_ud1_t	udata;
+
+    FUNC_ENTER(H5F_istore_nchunks, 0);
+    udata.mesg.ndims = ndims;
+    udata.total_storage = 0;
+    if (H5B_iterate(f, H5B_ISTORE, addr, &udata)<0) {
+	HRETURN_ERROR(H5E_IO, H5E_INTERNAL, 0,
+		      "unable to iterate over chunk B-tree");
+    }
+    FUNC_LEAVE(udata.total_storage);
+}
+
+
+/*-------------------------------------------------------------------------
  * Function:	H5F_istore_stats
  *
  * Purpose:	Print raw data cache statistics to the debug stream.  If
diff --git a/src/H5Fmpio.c b/src/H5Fmpio.c
index aba0200..91be471 100644
--- a/src/H5Fmpio.c
+++ b/src/H5Fmpio.c
@@ -106,17 +106,16 @@ static H5F_low_t *H5F_mpio_open(const char *name,
 				H5F_search_t *key/*out*/);
 static herr_t H5F_mpio_close(H5F_low_t *lf, const H5F_access_t *access_parms);
 static herr_t H5F_mpio_read(H5F_low_t *lf, H5F_access_t *access_parms,
-			    const H5D_transfer_t xfer_mode,
-			    const haddr_t *addr, size_t size,
-			    uint8_t *buf/*out*/);
+			    const H5F_xfer_t *xfer_parms, const haddr_t *addr,
+			    size_t size, uint8_t *buf/*out*/);
 htri_t H5F_mpio_tas_allsame(H5F_low_t *lf, hbool_t newval );
 static herr_t H5F_mpio_write(H5F_low_t *lf, H5F_access_t *access_parms,
-			     const H5D_transfer_t xfer_mode,
-			     const haddr_t *addr, size_t size,
-			     const uint8_t *buf);
+			     const H5F_xfer_t *xfer_parms, const haddr_t *addr,
+			     size_t size, const uint8_t *buf);
 static herr_t H5F_mpio_flush(H5F_low_t *lf, const H5F_access_t *access_parms);
-static herr_t H5F_MPIOff_to_haddr(MPI_Offset mpi_off, haddr_t *addr);
-static herr_t H5F_haddr_to_MPIOff(haddr_t addr, MPI_Offset *mpi_off);
+static herr_t H5F_MPIOff_to_haddr(MPI_Offset mpi_off, haddr_t *addr/*out*/);
+static herr_t H5F_haddr_to_MPIOff(const haddr_t *addr,
+				  MPI_Offset *mpi_off/*out*/);
 
 const H5F_low_class_t	H5F_LOW_MPIO_g[1] = {{
     H5F_mpio_access,		/*access method				*/
@@ -497,11 +496,14 @@ H5F_mpio_close(H5F_low_t *lf, const H5F_access_t UNUSED *access_parms)
  *	The guts of H5F_mpio_read and H5F_mpio_write
  *	should be replaced by a single dual-purpose routine.
  *
+ * 	Robb Matzke, 19990421
+ *	Changed xfer_mode to xfer_parms for all H5F_*_read() callbacks.
+ *
  *-------------------------------------------------------------------------
  */
 static herr_t
 H5F_mpio_read(H5F_low_t *lf, H5F_access_t *access_parms,
-	      const H5D_transfer_t xfer_mode,
+	      const H5F_xfer_t *xfer_parms,
 	      const haddr_t *addr, size_t size, uint8_t *buf/*out*/)
 {
     MPI_Offset  mpi_off, mpi_disp;
@@ -518,7 +520,7 @@ H5F_mpio_read(H5F_low_t *lf, H5F_access_t *access_parms,
 #endif
 
     /* some numeric conversions */
-    if (SUCCEED != H5F_haddr_to_MPIOff( *addr, &mpi_off )) {
+    if (SUCCEED != H5F_haddr_to_MPIOff(addr, &mpi_off)) {
 	HRETURN_ERROR(H5E_IO, H5E_BADTYPE, FAIL,
 			"couldn't convert addr to MPIOffset" );
     }
@@ -545,8 +547,9 @@ H5F_mpio_read(H5F_low_t *lf, H5F_access_t *access_parms,
 	buf_type = access_parms->u.mpio.btype;
 	file_type = access_parms->u.mpio.ftype;
 	if (SUCCEED !=
-	    H5F_haddr_to_MPIOff( access_parms->u.mpio.disp, &mpi_disp)) {
-	    HRETURN_ERROR(H5E_IO, H5E_BADTYPE, FAIL, "couldn't convert addr to MPIOffset" );
+	    H5F_haddr_to_MPIOff(&(access_parms->u.mpio.disp), &mpi_disp)) {
+	    HRETURN_ERROR(H5E_IO, H5E_BADTYPE, FAIL,
+			  "couldn't convert addr to MPIOffset" );
 	}
     } else {
 	/* Prepare for a simple xfer of a contiguous block of bytes.
@@ -576,7 +579,7 @@ H5F_mpio_read(H5F_low_t *lf, H5F_access_t *access_parms,
     access_parms->u.mpio.use_types = 0;
 
     /* Read the data.  */
-    switch (xfer_mode){
+    switch (xfer_parms->xfer_mode){
     case H5D_XFER_INDEPENDENT:
     case H5D_XFER_DFLT:
 	mpierr = MPI_File_read_at     ( lf->u.mpio.f, mpi_off, (void*) buf,
@@ -744,11 +747,14 @@ H5F_mpio_tas_allsame(H5F_low_t *lf, hbool_t newval )
  * 	rky, 980828
  *	Added allsame parameter to make all but proc 0 skip the actual write.
  *
+ * 	Robb Matzke, 19990421
+ *	Changed xfer_mode to xfer_parms for all H5F_*_write() callbacks.
+ *
  *-------------------------------------------------------------------------
  */
 static herr_t
 H5F_mpio_write(H5F_low_t *lf, H5F_access_t *access_parms,
-	       const H5D_transfer_t xfer_mode,
+	       const H5F_xfer_t *xfer_parms,
 	       const haddr_t *addr, size_t size, const uint8_t *buf)
 {
     MPI_Offset  mpi_off, mpi_disp;
@@ -766,18 +772,19 @@ H5F_mpio_write(H5F_low_t *lf, H5F_access_t *access_parms,
 #endif
 
     /* some numeric conversions */
-    if (SUCCEED != H5F_haddr_to_MPIOff( *addr, &mpi_off )) {
+    if (SUCCEED != H5F_haddr_to_MPIOff(addr, &mpi_off)) {
 	HRETURN_ERROR(H5E_IO, H5E_BADTYPE, FAIL,
-			"couldn't convert addr to MPIOffset" );
+		      "couldn't convert addr to MPIOffset" );
     }
-    if (SUCCEED!=H5F_haddr_to_MPIOff( access_parms->u.mpio.disp, &mpi_disp)) {
+    if (SUCCEED!=H5F_haddr_to_MPIOff(&(access_parms->u.mpio.disp),
+				     &mpi_disp)) {
 	HRETURN_ERROR(H5E_IO, H5E_BADTYPE, FAIL,
-			"couldn't convert addr to MPIOffset" );
+		      "couldn't convert addr to MPIOffset" );
     }
     size_i = (int)size;
     if ((size_t)size_i != size) {	/* check type conversion */
 	HRETURN_ERROR(H5E_IO, H5E_BADTYPE, FAIL,
-			"couldn't convert size to int" );
+		      "couldn't convert size to int" );
     }
 
 #ifdef H5Fmpio_DEBUG
@@ -813,8 +820,9 @@ H5F_mpio_write(H5F_low_t *lf, H5F_access_t *access_parms,
 	buf_type = access_parms->u.mpio.btype;
 	file_type = access_parms->u.mpio.ftype;
 	if (SUCCEED !=
-	    H5F_haddr_to_MPIOff( access_parms->u.mpio.disp, &mpi_disp)) {
-	    HRETURN_ERROR(H5E_IO, H5E_BADTYPE, FAIL, "couldn't convert addr to MPIOffset" );
+	    H5F_haddr_to_MPIOff(&(access_parms->u.mpio.disp), &mpi_disp)) {
+	    HRETURN_ERROR(H5E_IO, H5E_BADTYPE, FAIL,
+			  "couldn't convert addr to MPIOffset" );
 	}
     } else {
 	/* Prepare for a simple xfer of a contiguous block of bytes.
@@ -844,7 +852,7 @@ H5F_mpio_write(H5F_low_t *lf, H5F_access_t *access_parms,
     access_parms->u.mpio.use_types = 0;
 
     /* Write the data.  */
-    switch (xfer_mode){
+    switch (xfer_parms->xfer_mode){
     case H5D_XFER_INDEPENDENT:
     case H5D_XFER_DFLT:
 	mpierr = MPI_File_write_at    ( lf->u.mpio.f, mpi_off, (void*) buf,
@@ -959,20 +967,25 @@ H5F_mpio_flush(H5F_low_t *lf, const H5F_access_t UNUSED *access_parms)
  *              January 30, 1998
  *
  * Modifications:
+ * 		Robb Matzke, 1999-04-23
+ *		An error is reported for address overflows. The ADDR output
+ *		argument is optional.
  *
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5F_MPIOff_to_haddr( MPI_Offset mpi_off, haddr_t *addr )
+H5F_MPIOff_to_haddr(MPI_Offset mpi_off, haddr_t *addr/*out*/)
 {
-    herr_t ret_val = FAIL;
-
-    addr->offset = (uint64_t) mpi_off;
-    if (addr->offset == mpi_off)
-	ret_val = SUCCEED;
+    FUNC_ENTER(H5F_MPIOff_to_haddr, FAIL);
 
-    return (ret_val);
+    if (addr) addr->offset = (uint64_t) mpi_off;
+    if (mpi_off != (MPI_Offset)(uint64_t)mpi_off) {
+	HRETURN_ERROR(H5E_IO, H5E_OVERFLOW, FAIL, "bad MPI address");
+    }
+    
+    FUNC_LEAVE(SUCCEED);
 }
+
 
 /*-------------------------------------------------------------------------
  * Function:    H5F_haddr_to_MPIOff
@@ -988,20 +1001,26 @@ H5F_MPIOff_to_haddr( MPI_Offset mpi_off, haddr_t *addr )
  *              January 30, 1998
  *
  * Modifications:
+ * 		Robb Matzke, 1999-04-23
+ *		An error is reported for address overflows. The ADDR output
+ *		argument is optional.
  *
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5F_haddr_to_MPIOff( haddr_t addr, MPI_Offset *mpi_off )
+H5F_haddr_to_MPIOff(const haddr_t *addr, MPI_Offset *mpi_off/*out*/)
 {
-    herr_t ret_val = FAIL;
-
-    *mpi_off = (MPI_Offset) addr.offset;
-    if (*mpi_off ==  addr.offset)
-	ret_val = SUCCEED;
+    FUNC_ENTER(H5F_haddr_to_MPIOff, FAIL);
 
-    return (ret_val);
+    if (mpi_off) *mpi_off = (MPI_Offset)addr->offset;
+    if (addr->offset != (uint64_t)(MPI_Offset)(addr->offset)) {
+	HRETURN_ERROR(H5E_IO, H5E_OVERFLOW, FAIL,
+		      "hdf5 address overflows MPI address");
+    }
+    
+    FUNC_LEAVE(SUCCEED);
 }
+
 
 /*-------------------------------------------------------------------------
  * Function:	H5PC_Wait_for_left_neighbor
diff --git a/src/H5Fprivate.h b/src/H5Fprivate.h
index 55048b3..0d46f07 100644
--- a/src/H5Fprivate.h
+++ b/src/H5Fprivate.h
@@ -512,6 +512,18 @@ typedef struct H5F_t {
     H5F_mtab_t		mtab;		/* File mount table		*/
 } H5F_t;
 
+/* Dataset transfer property list */
+typedef struct H5F_xfer_t {
+    size_t		buf_size;	/*max temp buffer size		     */
+    void		*tconv_buf;	/*type conversion buffer or null     */
+    void		*bkg_buf;	/*background buffer or null	     */
+    H5T_bkg_t		need_bkg;	/*type of background buffer needed   */
+    double		split_ratios[3];/*B-tree node splitting ratios	     */
+    uintn       	cache_hyper;    /*cache hyperslab blocks during I/O? */
+    uintn       	block_limit;    /*largest hyperslab block to cache   */
+    H5D_transfer_t	xfer_mode;	/*independent or collective transfer */
+} H5F_xfer_t;
+
 #ifdef NOT_YET
 #define H5F_ENCODE_OFFSET(f,p,o) (H5F_SIZEOF_ADDR(f)==4 ? UINT32ENCODE(p,o) \
     : H5F_SIZEOF_ADDR(f)==8 ? UINT64ENCODE(p,o) \
@@ -556,13 +568,14 @@ typedef struct H5F_t {
 struct H5O_layout_t;
 struct H5O_efl_t;
 struct H5O_pline_t;
-struct H5D_xfer_t;
+struct H5F_xfer_t;
 struct H5O_fill_t;
 struct H5G_entry_t;
 
 /* library variables */
 __DLLVAR__ const H5F_create_t H5F_create_dflt;
 __DLLVAR__ H5F_access_t H5F_access_dflt;
+__DLLVAR__ const H5F_xfer_t H5F_xfer_dflt;
 __DLLVAR__ const H5F_mprop_t H5F_mount_dflt;
 
 #ifdef HAVE_PARALLEL
@@ -588,7 +601,7 @@ __DLL__ herr_t H5F_mountpoint(struct H5G_entry_t *find/*in,out*/);
 /* Functions that operate on array storage */
 __DLL__ herr_t H5F_arr_create(H5F_t *f,
 			      struct H5O_layout_t *layout /*in,out*/);
-__DLL__ herr_t H5F_arr_read (H5F_t *f, const struct H5D_xfer_t *xfer,
+__DLL__ herr_t H5F_arr_read (H5F_t *f, const struct H5F_xfer_t *xfer,
 			     const struct H5O_layout_t *layout,
 			     const struct H5O_pline_t *pline,
 			     const struct H5O_fill_t *fill,
@@ -597,7 +610,7 @@ __DLL__ herr_t H5F_arr_read (H5F_t *f, const struct H5D_xfer_t *xfer,
 			     const hsize_t mem_size[],
 			     const hssize_t mem_offset[],
 			     const hssize_t file_offset[], void *_buf/*out*/);
-__DLL__ herr_t H5F_arr_write (H5F_t *f, const struct H5D_xfer_t *xfer,
+__DLL__ herr_t H5F_arr_write (H5F_t *f, const struct H5F_xfer_t *xfer,
 			      const struct H5O_layout_t *layout,
 			      const struct H5O_pline_t *pline,
 			      const struct H5O_fill_t *fill,
@@ -611,16 +624,17 @@ __DLL__ herr_t H5F_arr_write (H5F_t *f, const struct H5D_xfer_t *xfer,
 __DLL__ herr_t H5F_istore_init (H5F_t *f);
 __DLL__ herr_t H5F_istore_flush (H5F_t *f, hbool_t preempt);
 __DLL__ herr_t H5F_istore_dest (H5F_t *f);
+__DLL__ hsize_t H5F_istore_allocated(H5F_t *f, int ndims, haddr_t *addr);
 __DLL__ herr_t H5F_istore_stats (H5F_t *f, hbool_t headers);
 __DLL__ herr_t H5F_istore_create(H5F_t *f,
 				 struct H5O_layout_t *layout/*in,out*/);
-__DLL__ herr_t H5F_istore_read(H5F_t *f, const struct H5D_xfer_t *xfer,
+__DLL__ herr_t H5F_istore_read(H5F_t *f, const struct H5F_xfer_t *xfer,
 			       const struct H5O_layout_t *layout,
 			       const struct H5O_pline_t *pline,
 			       const struct H5O_fill_t *fill,
 			       const hssize_t offset[], const hsize_t size[],
 			       void *buf/*out*/);
-__DLL__ herr_t H5F_istore_write(H5F_t *f, const struct H5D_xfer_t *xfer,
+__DLL__ herr_t H5F_istore_write(H5F_t *f, const struct H5F_xfer_t *xfer,
 				const struct H5O_layout_t *layout,
 				const struct H5O_pline_t *pline,
 				const struct H5O_fill_t *fill,
diff --git a/src/H5Fpublic.h b/src/H5Fpublic.h
index 8646f02..177a17b 100644
--- a/src/H5Fpublic.h
+++ b/src/H5Fpublic.h
@@ -78,6 +78,13 @@ typedef enum H5F_scope_t {
 /* Unlimited file size for H5Pset_external() */
 #define H5F_UNLIMITED	((hsize_t)(-1L))
 
+/* How is the `bkg' buffer used by the conversion function? */
+typedef enum H5T_bkg_t {
+    H5T_BKG_NO		= 0, 	/*background buffer is not needed, send NULL */
+    H5T_BKG_TEMP	= 1, 	/*bkg buffer used as temp storage only	     */
+    H5T_BKG_YES		= 2	/*init bkg buf with data before conversion   */
+} H5T_bkg_t;
+
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/src/H5Gnode.c b/src/H5Gnode.c
index 7f95906..09cc40c 100644
--- a/src/H5Gnode.c
+++ b/src/H5Gnode.c
@@ -61,7 +61,8 @@ static H5B_ins_t H5G_node_insert(H5F_t *f, const haddr_t *addr,
 static H5B_ins_t H5G_node_remove(H5F_t *f, const haddr_t *addr, void *lt_key,
 				 hbool_t *lt_key_changed, void *udata,
 				 void *rt_key, hbool_t *rt_key_changed);
-static herr_t H5G_node_iterate(H5F_t *f, const haddr_t *addr, void *_udata);
+static herr_t H5G_node_iterate(H5F_t *f, void *_lt_key, const haddr_t *addr,
+			       void *_rt_key, void *_udata);
 static size_t H5G_node_sizeof_rkey(H5F_t *f, const void *_udata);
 
 /* H5G inherits cache-like properties from H5AC */
@@ -1034,7 +1035,8 @@ H5G_node_remove(H5F_t *f, const haddr_t *addr, void *_lt_key/*in,out*/,
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5G_node_iterate (H5F_t *f, const haddr_t *addr, void *_udata)
+H5G_node_iterate (H5F_t *f, void UNUSED *_lt_key, const haddr_t *addr,
+		  void UNUSED *_rt_key, void *_udata)
 {
     H5G_bt_ud2_t	*bt_udata = (H5G_bt_ud2_t *)_udata;
     H5G_node_t		*sn = NULL;
diff --git a/src/H5P.c b/src/H5P.c
index 99bc563..2bbc54c 100644
--- a/src/H5P.c
+++ b/src/H5P.c
@@ -182,11 +182,11 @@ H5Pcreate(H5P_class_t type)
 	break;
 
     case H5P_DATASET_XFER:
-	if (NULL==(plist = H5MM_malloc(sizeof(H5D_xfer_t)))) {
+	if (NULL==(plist = H5MM_malloc(sizeof(H5F_xfer_t)))) {
 	    HRETURN_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL,
 			   "memory allocation failed");
 	}
-	HDmemcpy(plist, &H5D_xfer_dflt, sizeof(H5D_xfer_t));
+	HDmemcpy(plist, &H5F_xfer_dflt, sizeof(H5F_xfer_t));
 	break;
 
     case H5P_MOUNT:
@@ -1979,7 +1979,7 @@ H5Pget_cache(hid_t plist_id, int *mdc_nelmts,
 herr_t
 H5Pset_buffer(hid_t plist_id, size_t size, void *tconv, void *bkg)
 {
-    H5D_xfer_t		*plist = NULL;
+    H5F_xfer_t		*plist = NULL;
     
     FUNC_ENTER (H5Pset_buffer, FAIL);
     H5TRACE4("e","izxx",plist_id,size,tconv,bkg);
@@ -2023,7 +2023,7 @@ H5Pset_buffer(hid_t plist_id, size_t size, void *tconv, void *bkg)
 size_t
 H5Pget_buffer(hid_t plist_id, void **tconv/*out*/, void **bkg/*out*/)
 {
-    H5D_xfer_t		*plist = NULL;
+    H5F_xfer_t		*plist = NULL;
     
     FUNC_ENTER (H5Pget_buffer, 0);
     H5TRACE3("z","ixx",plist_id,tconv,bkg);
@@ -2069,7 +2069,7 @@ H5Pget_buffer(hid_t plist_id, void **tconv/*out*/, void **bkg/*out*/)
 herr_t
 H5Pset_hyper_cache(hid_t plist_id, unsigned cache, unsigned limit)
 {
-    H5D_xfer_t		*plist = NULL;
+    H5F_xfer_t		*plist = NULL;
     
     FUNC_ENTER (H5Pset_hyper_cache, FAIL);
     H5TRACE3("e","iIuIu",plist_id,cache,limit);
@@ -2107,7 +2107,7 @@ herr_t
 H5Pget_hyper_cache(hid_t plist_id, unsigned *cache/*out*/,
 		   unsigned *limit/*out*/)
 {
-    H5D_xfer_t		*plist = NULL;
+    H5F_xfer_t		*plist = NULL;
     
     FUNC_ENTER (H5Pget_hyper_cache, 0);
     H5TRACE3("e","ixx",plist_id,cache,limit);
@@ -2148,7 +2148,7 @@ H5Pget_hyper_cache(hid_t plist_id, unsigned *cache/*out*/,
 herr_t
 H5Pset_preserve(hid_t plist_id, hbool_t status)
 {
-    H5D_xfer_t		*plist = NULL;
+    H5F_xfer_t		*plist = NULL;
     
     FUNC_ENTER (H5Pset_preserve, FAIL);
     H5TRACE2("e","ib",plist_id,status);
@@ -2186,7 +2186,7 @@ H5Pset_preserve(hid_t plist_id, hbool_t status)
 int
 H5Pget_preserve(hid_t plist_id)
 {
-    H5D_xfer_t		*plist = NULL;
+    H5F_xfer_t		*plist = NULL;
     
     FUNC_ENTER (H5Pset_preserve, FAIL);
     H5TRACE1("Is","i",plist_id);
@@ -2497,7 +2497,7 @@ herr_t
 H5Pget_btree_ratios(hid_t plist_id, double *left/*out*/, double *middle/*out*/,
 		    double *right/*out*/)
 {
-    H5D_xfer_t		*plist = NULL;
+    H5F_xfer_t		*plist = NULL;
 
     FUNC_ENTER(H5Pget_btree_ratios, FAIL);
     H5TRACE4("e","ixxx",plist_id,left,middle,right);
@@ -2544,7 +2544,7 @@ herr_t
 H5Pset_btree_ratios(hid_t plist_id, double left, double middle,
 		    double right)
 {
-    H5D_xfer_t		*plist = NULL;
+    H5F_xfer_t		*plist = NULL;
 
     FUNC_ENTER(H5Pget_btree_ratios, FAIL);
     H5TRACE4("e","iddd",plist_id,left,middle,right);
@@ -2903,7 +2903,7 @@ H5Pget_mpi(hid_t plist_id, MPI_Comm *comm, MPI_Info *info)
 herr_t
 H5Pset_xfer(hid_t plist_id, H5D_transfer_t data_xfer_mode)
 {
-    H5D_xfer_t		*plist = NULL;
+    H5F_xfer_t		*plist = NULL;
 
     FUNC_ENTER(H5Pset_xfer, FAIL);
     H5TRACE2("e","iDt",plist_id,data_xfer_mode);
@@ -2951,7 +2951,7 @@ H5Pset_xfer(hid_t plist_id, H5D_transfer_t data_xfer_mode)
 herr_t
 H5Pget_xfer(hid_t plist_id, H5D_transfer_t *data_xfer_mode)
 {
-    H5D_xfer_t		*plist = NULL;
+    H5F_xfer_t		*plist = NULL;
 
     FUNC_ENTER (H5Pget_xfer, FAIL);
     H5TRACE2("e","i*Dt",plist_id,data_xfer_mode);
@@ -3151,7 +3151,7 @@ H5P_copy (H5P_class_t type, const void *src)
 	break;
 
     case H5P_DATASET_XFER:
-	size = sizeof(H5D_xfer_t);
+	size = sizeof(H5F_xfer_t);
 	break;
 
     case H5P_MOUNT:
diff --git a/src/H5RA.c b/src/H5RA.c
index bf0f5ef..389e8dc 100644
--- a/src/H5RA.c
+++ b/src/H5RA.c
@@ -738,7 +738,7 @@ H5RA_write(H5RA_t *ra, hssize_t start_row, hsize_t nrows, H5T_t *type,
 		    "memory allocation failed for meta data");
     }
     if (H5D_read(ra->meta, H5RA_meta_type_g, mm_space, mf_space,
-		 &H5D_xfer_dflt, meta)<0) {
+		 &H5F_xfer_dflt, meta)<0) {
 	HGOTO_ERROR(H5E_RAGGED, H5E_READERROR, FAIL,
 		    "unable to read meta data");
     }
@@ -779,7 +779,7 @@ H5RA_write(H5RA_t *ra, hssize_t start_row, hsize_t nrows, H5T_t *type,
 	HGOTO_ERROR(H5E_RAGGED, H5E_CANTINIT, FAIL,
 		    "unable to set meta data selection");
     }
-    if (H5D_write(ra->raw, type, rm_space, rf_space, &H5D_xfer_dflt,
+    if (H5D_write(ra->raw, type, rm_space, rf_space, &H5F_xfer_dflt,
 		  raw_buf)<0) {
 	HGOTO_ERROR(H5E_RAGGED, H5E_WRITEERROR, FAIL,
 		    "unable to write raw data");
@@ -809,7 +809,7 @@ H5RA_write(H5RA_t *ra, hssize_t start_row, hsize_t nrows, H5T_t *type,
 		    "unable to set meta data selection");
     }
     if (H5D_write(ra->meta, H5RA_meta_type_g, mm_space, mf_space,
-		  &H5D_xfer_dflt, meta)<0) {
+		  &H5F_xfer_dflt, meta)<0) {
 	HGOTO_ERROR(H5E_RAGGED, H5E_WRITEERROR, FAIL,
 		    "unable to write meta data");
     }
@@ -926,7 +926,7 @@ H5RA_fix_overflow(H5RA_t *ra, H5T_t *type, H5RA_meta_t *meta, hsize_t nelmts,
 	    HGOTO_ERROR(H5E_RAGGED, H5E_CANTINIT, FAIL,
 			"unable to set overflow selection");
 	}
-	if (H5D_write(ra->over, type, om_space, of_space, &H5D_xfer_dflt,
+	if (H5D_write(ra->over, type, om_space, of_space, &H5F_xfer_dflt,
 		      buf)<0) {
 	    HGOTO_ERROR(H5E_RAGGED, H5E_WRITEERROR, FAIL,
 			"unable to write to overflow dataset");
@@ -1103,7 +1103,7 @@ H5RA_read(H5RA_t *ra, hssize_t start_row, hsize_t nrows, H5T_t *type,
 	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
 		    "memory allocation failed for raw dataset");
     }
-    if (H5D_read(ra->raw, type, rm_space, rf_space, &H5D_xfer_dflt,
+    if (H5D_read(ra->raw, type, rm_space, rf_space, &H5F_xfer_dflt,
 		 raw_buf)<0) {
 	HGOTO_ERROR(H5E_RAGGED, H5E_READERROR, FAIL,
 		    "unable to read raw dataset");
@@ -1134,7 +1134,7 @@ H5RA_read(H5RA_t *ra, hssize_t start_row, hsize_t nrows, H5T_t *type,
 		    "unable to set meta data selection");
     }
     if (H5D_read(ra->meta, H5RA_meta_type_g, mm_space, mf_space,
-		 &H5D_xfer_dflt, meta)<0) {
+		 &H5F_xfer_dflt, meta)<0) {
 	HGOTO_ERROR(H5E_RAGGED, H5E_READERROR, FAIL,
 		    "unable to read meta data");
     }
@@ -1182,7 +1182,7 @@ H5RA_read(H5RA_t *ra, hssize_t start_row, hsize_t nrows, H5T_t *type,
 		HGOTO_ERROR(H5E_RAGGED, H5E_CANTINIT, FAIL,
 			    "unable to set overflow selection");
 	    }
-	    if (H5D_read(ra->over, type, om_space, of_space, &H5D_xfer_dflt,
+	    if (H5D_read(ra->over, type, om_space, of_space, &H5F_xfer_dflt,
 			 buf_out[i])<0) {
 		HGOTO_ERROR(H5E_RAGGED, H5E_CANTINIT, FAIL,
 			    "unable to read overflow dataset");
diff --git a/src/H5S.c b/src/H5S.c
index ff0a31c..d9e5c49 100644
--- a/src/H5S.c
+++ b/src/H5S.c
@@ -1462,7 +1462,8 @@ H5S_find (const H5S_t *mem_space, const H5S_t *file_space)
      * We can't do conversion if the source and destination select a
      * different number of data points.
      */
-    if (H5S_get_select_npoints (mem_space) != H5S_get_select_npoints (file_space)) {
+    if (H5S_get_select_npoints(mem_space) !=
+	H5S_get_select_npoints (file_space)) {
         HRETURN_ERROR (H5E_DATASPACE, H5E_BADRANGE, NULL,
 		       "memory and file data spaces are different sizes");
     }
@@ -1489,7 +1490,27 @@ H5S_find (const H5S_t *mem_space, const H5S_t *file_space)
     }
 
     /*
-     * Extend the table.
+     * Create a new path.
+     */
+    if (NULL==(path = H5MM_calloc(sizeof(*path)))) {
+	HRETURN_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL,
+		      "memory allocation failed for data space conversion "
+		      "path");
+    }
+    path->f = H5S_fconv_g[file_space->select.type];
+    path->m = H5S_mconv_g[mem_space->select.type];
+
+    /*
+     * Initialize direct read/write functions
+     */
+    if (H5S_SEL_ALL==file_space->select.type &&
+	H5S_SEL_ALL==mem_space->select.type) {
+	path->read = H5S_all_read;
+	path->write = H5S_all_write;
+    }
+    
+    /*
+     * Add the new path to the table.
      */
     if (H5S_nconv_g>=H5S_aconv_g) {
 	size_t n = MAX(10, 2*H5S_aconv_g);
@@ -1502,17 +1523,6 @@ H5S_find (const H5S_t *mem_space, const H5S_t *file_space)
 	H5S_aconv_g = n;
 	H5S_conv_g = p;
     }
-
-    /*
-     * Create a new path and add it to the table.
-     */
-    if (NULL==(path = H5MM_calloc(sizeof(*path)))) {
-	HRETURN_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL,
-		      "memory allocation failed for data space conversion "
-		      "path");
-    }
-    path->f = H5S_fconv_g[file_space->select.type];
-    path->m = H5S_mconv_g[mem_space->select.type];
     H5S_conv_g[H5S_nconv_g++] = path;
 
     FUNC_LEAVE(path);
diff --git a/src/H5Sall.c b/src/H5Sall.c
index 5e91b6f..6ebd241 100644
--- a/src/H5Sall.c
+++ b/src/H5Sall.c
@@ -28,14 +28,14 @@ static size_t H5S_all_fgath (H5F_t *f, const struct H5O_layout_t *layout,
 			     const struct H5O_efl_t *efl, size_t elmt_size,
 			     const H5S_t *file_space,
 			     H5S_sel_iter_t *file_iter, size_t nelmts,
-			     const H5D_xfer_t *xfer_parms, void *buf/*out*/);
+			     const H5F_xfer_t *xfer_parms, void *buf/*out*/);
 static herr_t H5S_all_fscat (H5F_t *f, const struct H5O_layout_t *layout,
 			     const struct H5O_pline_t *pline,
 			     const struct H5O_fill_t *fill,
 			     const struct H5O_efl_t *efl, size_t elmt_size,
 			     const H5S_t *file_space,
 			     H5S_sel_iter_t *file_iter, size_t nelmts,
-			     const H5D_xfer_t *xfer_parms, const void *buf);
+			     const H5F_xfer_t *xfer_parms, const void *buf);
 static size_t H5S_all_mgath (const void *_buf, size_t elmt_size,
 			     const H5S_t *mem_space, H5S_sel_iter_t *mem_iter,
 			     size_t nelmts, void *_tconv_buf/*out*/);
@@ -172,7 +172,7 @@ H5S_all_fgath (H5F_t *f, const struct H5O_layout_t *layout,
 	       const struct H5O_fill_t *fill, const struct H5O_efl_t *efl,
 	       size_t elmt_size, const H5S_t *file_space,
 	       H5S_sel_iter_t *file_iter, size_t nelmts,
-	       const H5D_xfer_t *xfer_parms, void *_buf/*out*/)
+	       const H5F_xfer_t *xfer_parms, void *_buf/*out*/)
 {
     hssize_t	file_offset[H5O_LAYOUT_NDIMS];	/*offset of slab in file*/
     hsize_t	hsize[H5O_LAYOUT_NDIMS];	/*size of hyperslab	*/
@@ -260,7 +260,7 @@ H5S_all_fscat (H5F_t *f, const struct H5O_layout_t *layout,
 	       const struct H5O_pline_t *pline, const struct H5O_fill_t *fill,
 	       const struct H5O_efl_t *efl, size_t elmt_size,
 	       const H5S_t *file_space, H5S_sel_iter_t *file_iter,
-	       size_t nelmts, const H5D_xfer_t *xfer_parms, const void *_buf)
+	       size_t nelmts, const H5F_xfer_t *xfer_parms, const void *_buf)
 {
     hssize_t	file_offset[H5O_LAYOUT_NDIMS];	/*offset of hyperslab	*/
     hsize_t	hsize[H5O_LAYOUT_NDIMS];	/*size of hyperslab	*/
@@ -499,7 +499,144 @@ H5S_all_mscat (const void *_tconv_buf, size_t elmt_size,
     mem_iter->all.offset+=nelmts;
     
     FUNC_LEAVE (SUCCEED);
-}   /* H5S_all_mscat() */
+}
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5S_all_read
+ *
+ * Purpose:	Reads directly from file into application memory if possible.
+ *
+ * Return:	Success:	Non-negative. If data was read directly then
+ *				MUST_CONVERT is set to zero, otherwise
+ *				MUST_CONVERT is set to non-zero.
+ *
+ *		Failure:	Negative. Return value of MUST_CONVERT is
+ *				undefined.
+ *
+ * Programmer:	Robb Matzke
+ *              Thursday, April 22, 1999
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5S_all_read(H5F_t *f, const H5O_layout_t *layout, const H5O_pline_t *pline,
+	     const H5O_efl_t *efl, size_t elmt_size, const H5S_t *file_space,
+	     const H5S_t *mem_space, const H5F_xfer_t *xfer_parms,
+	     void *buf/*out*/, hbool_t *must_convert/*out*/)
+{
+    hsize_t	size[H5S_MAX_RANK];
+    hssize_t	offset[H5S_MAX_RANK];
+    int		i;
+
+    FUNC_ENTER(H5S_all_read, FAIL);
+    *must_convert = TRUE;
+
+    /* Check whether we can handle this */
+    if (H5S_SIMPLE!=mem_space->extent.type) goto fall_through;
+    if (H5S_SIMPLE!=file_space->extent.type) goto fall_through;
+    if (mem_space->extent.u.simple.rank!=
+	file_space->extent.u.simple.rank) goto fall_through;
+
+    /* Get information about memory and file */
+    for (i=0; i<mem_space->extent.u.simple.rank; i++) {
+	if (mem_space->extent.u.simple.max &&
+	    mem_space->extent.u.simple.size[i]!=
+	    mem_space->extent.u.simple.max[i]) goto fall_through;
+	if (file_space->extent.u.simple.max &&
+	    file_space->extent.u.simple.size[i]!=
+	    file_space->extent.u.simple.max[i]) goto fall_through;
+	if (mem_space->extent.u.simple.size[i]!=
+	    file_space->extent.u.simple.size[i]) goto fall_through;
+	size[i] = mem_space->extent.u.simple.size[i];
+	offset[i] = 0;
+    }
+    size[i] = elmt_size;
+    offset[i] = 0;
+
+    /* Read data from the file */
+    if (H5F_arr_read(f, xfer_parms, layout, pline, NULL, efl, size,
+		     size, offset, offset, buf/*out*/)<0) {
+	HRETURN_ERROR(H5E_IO, H5E_INTERNAL, FAIL,
+		      "unable to write data to the file");
+    }
+    *must_convert = FALSE;
+
+ fall_through:
+    FUNC_LEAVE(SUCCEED);
+}
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5S_all_write
+ *
+ * Purpose:	Writes data directly to the file if possible.
+ *
+ * Return:	Success:	Non-negative. If data was written directly
+ *				then MUST_CONVERT is set to zero, otherwise
+ *				MUST_CONVERT is set to non-zero.
+ *
+ *		Failure:	Negative. Return value of MUST_CONVERT is
+ *				undefined.
+ *
+ * Programmer:	Robb Matzke
+ *              Wednesday, April 21, 1999
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5S_all_write(H5F_t *f, const struct H5O_layout_t *layout,
+	      const H5O_pline_t *pline, const H5O_efl_t *efl,
+	      size_t elmt_size, const H5S_t *file_space,
+	      const H5S_t *mem_space, const H5F_xfer_t *xfer_parms,
+	      const void *buf, hbool_t *must_convert/*out*/)
+{
+    hsize_t	size[H5S_MAX_RANK];
+    hssize_t	offset[H5S_MAX_RANK];
+    int		i;
+    
+    FUNC_ENTER(H5S_all_write, FAIL);
+    *must_convert = TRUE;
+
+    /* Check whether we can handle this */
+    if (H5S_SIMPLE!=mem_space->extent.type) goto fall_through;
+    if (H5S_SIMPLE!=file_space->extent.type) goto fall_through;
+    if (mem_space->extent.u.simple.rank!=
+	file_space->extent.u.simple.rank) goto fall_through;
+
+    /* Get information about memory and file */
+    for (i=0; i<mem_space->extent.u.simple.rank; i++) {
+	if (mem_space->extent.u.simple.max &&
+	    mem_space->extent.u.simple.size[i]!=
+	    mem_space->extent.u.simple.max[i]) goto fall_through;
+	if (file_space->extent.u.simple.max &&
+	    file_space->extent.u.simple.size[i]!=
+	    file_space->extent.u.simple.max[i]) goto fall_through;
+	if (mem_space->extent.u.simple.size[i]!=
+	    file_space->extent.u.simple.size[i]) goto fall_through;
+	size[i] = mem_space->extent.u.simple.size[i];
+	offset[i] = 0;
+    }
+    size[i] = elmt_size;
+    offset[i] = 0;
+
+    /* Write data to the file */
+    if (H5F_arr_write(f, xfer_parms, layout, pline, NULL, efl, size,
+		      size, offset, offset, buf)<0) {
+	HRETURN_ERROR(H5E_IO, H5E_INTERNAL, FAIL,
+		      "unable to write data to the file");
+    }
+    *must_convert = FALSE;
+
+
+ fall_through:
+    FUNC_LEAVE(SUCCEED);
+}
+
 
 /*--------------------------------------------------------------------------
  NAME
diff --git a/src/H5Shyper.c b/src/H5Shyper.c
index 082d033..2fba497 100644
--- a/src/H5Shyper.c
+++ b/src/H5Shyper.c
@@ -32,7 +32,7 @@ typedef struct {
     const H5S_t *space;
     H5S_sel_iter_t *iter;
 	size_t nelmts;
-    const H5D_xfer_t *xfer_parms;
+    const H5F_xfer_t *xfer_parms;
     const void *src;
     void *dst;
     H5S_hyper_bound_t **lo_bounds;
@@ -60,14 +60,14 @@ static size_t H5S_hyper_fgath (H5F_t *f, const struct H5O_layout_t *layout,
 			       const struct H5O_efl_t *efl, size_t elmt_size,
 			       const H5S_t *file_space,
 			       H5S_sel_iter_t *file_iter, size_t nelmts,
-			       const H5D_xfer_t *xfer_parms, void *buf/*out*/);
+			       const H5F_xfer_t *xfer_parms, void *buf/*out*/);
 static herr_t H5S_hyper_fscat (H5F_t *f, const struct H5O_layout_t *layout,
 			       const struct H5O_pline_t *pline,
 			       const struct H5O_fill_t *fill,
 			       const struct H5O_efl_t *efl, size_t elmt_size,
 			       const H5S_t *file_space,
 			       H5S_sel_iter_t *file_iter, size_t nelmts,
-			       const H5D_xfer_t *xfer_parms, const void *buf);
+			       const H5F_xfer_t *xfer_parms, const void *buf);
 static size_t H5S_hyper_mgath (const void *_buf, size_t elmt_size,
 			       const H5S_t *mem_space,
 			       H5S_sel_iter_t *mem_iter, size_t nelmts,
@@ -809,7 +809,7 @@ H5S_hyper_fgath (H5F_t *f, const struct H5O_layout_t *layout,
 		 const struct H5O_fill_t *fill,
 		 const struct H5O_efl_t *efl, size_t elmt_size,
 		 const H5S_t *file_space, H5S_sel_iter_t *file_iter,
-		 size_t nelmts, const H5D_xfer_t *xfer_parms,
+		 size_t nelmts, const H5F_xfer_t *xfer_parms,
 		 void *_buf/*out*/)
 {
     H5S_hyper_bound_t **lo_bounds;    /* Lower (closest to the origin) bound array for each dimension */
@@ -1070,7 +1070,7 @@ H5S_hyper_fscat (H5F_t *f, const struct H5O_layout_t *layout,
 		 const struct H5O_fill_t *fill,
 		 const struct H5O_efl_t *efl, size_t elmt_size,
 		 const H5S_t *file_space, H5S_sel_iter_t *file_iter,
-		 size_t nelmts, const H5D_xfer_t *xfer_parms,
+		 size_t nelmts, const H5F_xfer_t *xfer_parms,
 		 const void *_buf)
 {
     H5S_hyper_bound_t **lo_bounds;    /* Lower (closest to the origin) bound array for each dimension */
diff --git a/src/H5Smpio.c b/src/H5Smpio.c
index a4e090b..19cbbbf 100644
--- a/src/H5Smpio.c
+++ b/src/H5Smpio.c
@@ -50,13 +50,12 @@ H5S_mpio_space_type( const H5S_t *space, const size_t elmt_size,
 		     hsize_t *count,
 		     hbool_t *is_derived_type );
 static herr_t
-H5S_mpio_spaces_xfer (H5F_t *f, const struct H5O_layout_t *layout,
+H5S_mpio_spaces_xfer(H5F_t *f, const struct H5O_layout_t *layout,
                      const struct H5O_pline_t UNUSED *pline,
                      const struct H5O_efl_t UNUSED *efl, size_t elmt_size,
                      const H5S_t *file_space, const H5S_t *mem_space,
-                     const H5D_transfer_t xfer_mode, void *buf /*out*/,
-		     hbool_t *must_convert /*out*/,
-		     const hbool_t do_write );
+                     const H5F_xfer_t *xfer_parms, void *buf/*out*/,
+		     hbool_t *must_convert/*out*/, const hbool_t do_write);
 
 /*-------------------------------------------------------------------------
  * Function:	H5S_mpio_all_type
@@ -448,7 +447,7 @@ H5S_mpio_spaces_xfer (H5F_t *f, const struct H5O_layout_t *layout,
                      const struct H5O_pline_t UNUSED *pline,
                      const struct H5O_efl_t UNUSED *efl, size_t elmt_size,
                      const H5S_t *file_space, const H5S_t *mem_space,
-                     const H5D_transfer_t xfer_mode, void *buf /*out*/,
+                     const H5F_xfer_t *xfer_parms, void *buf /*out*/,
 		     hbool_t *must_convert /*out*/,
 		     const hbool_t do_write )
 {
@@ -526,13 +525,13 @@ H5S_mpio_spaces_xfer (H5F_t *f, const struct H5O_layout_t *layout,
     	HRETURN_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL,"transfer size overflows size_t");
     if (do_write) {
     	err = H5F_low_write( f->shared->lf, f->shared->access_parms,
-			     xfer_mode, &addr, mpi_count, buf );
+			     xfer_parms->xfer_mode, &addr, mpi_count, buf );
     	if (err) {
 	    HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, FAIL,"MPI write failed");
 	}
     } else {
     	err = H5F_low_read ( f->shared->lf, f->shared->access_parms,
-			     xfer_mode, &addr, mpi_count, buf );
+			     xfer_parms->xfer_mode, &addr, mpi_count, buf );
     	if (err) {
 	    HRETURN_ERROR(H5E_IO, H5E_READERROR, FAIL,"MPI read failed");
 	}
@@ -577,16 +576,16 @@ H5S_mpio_spaces_read (H5F_t *f, const struct H5O_layout_t *layout,
                      const struct H5O_pline_t *pline,
                      const struct H5O_efl_t *efl, size_t elmt_size,
                      const H5S_t *file_space, const H5S_t *mem_space,
-                     const H5D_transfer_t xfer_mode, void *buf /*out*/,
-		     hbool_t *must_convert /*out*/ )
+                     const H5F_xfer_t *xfer_parms, void *buf/*out*/,
+		     hbool_t *must_convert/*out*/)
 {
     herr_t ret_value = FAIL;
 
     FUNC_ENTER (H5S_mpio_spaces_read, FAIL);
 
-    ret_value = H5S_mpio_spaces_xfer( f, layout, pline, efl, elmt_size,
-			file_space, mem_space, xfer_mode, (void*)buf,
-			must_convert /*out*/, 0 /*read*/ );
+    ret_value = H5S_mpio_spaces_xfer(f, layout, pline, efl, elmt_size,
+				     file_space, mem_space, xfer_parms,
+				     buf, must_convert/*out*/, 0/*read*/);
 
     FUNC_LEAVE (ret_value);
 } /* H5S_mpio_spaces_read() */
@@ -612,16 +611,17 @@ H5S_mpio_spaces_write(H5F_t *f, const struct H5O_layout_t *layout,
                      const struct H5O_pline_t *pline,
                      const struct H5O_efl_t *efl, size_t elmt_size,
                      const H5S_t *file_space, const H5S_t *mem_space,
-                     const H5D_transfer_t xfer_mode, const void *buf,
-		     hbool_t *must_convert /*out*/ )
+                     const H5F_xfer_t *xfer_parms, const void *buf,
+		     hbool_t *must_convert/*out*/)
 {
     herr_t ret_value = FAIL;
 
     FUNC_ENTER (H5S_mpio_spaces_write, FAIL);
 
-    ret_value = H5S_mpio_spaces_xfer( f, layout, pline, efl, elmt_size,
-			file_space, mem_space, xfer_mode, (void*)buf,
-			must_convert /*out*/, 1 /*write*/ );
+    ret_value = H5S_mpio_spaces_xfer(f, layout, pline, efl, elmt_size,
+				     file_space, mem_space, xfer_parms,
+				     (void*)buf, must_convert/*out*/,
+				     1/*write*/);
 
     FUNC_LEAVE (ret_value);
 } /* H5S_mpio_spaces_write() */
diff --git a/src/H5Spoint.c b/src/H5Spoint.c
index a4f4931..a58461b 100644
--- a/src/H5Spoint.c
+++ b/src/H5Spoint.c
@@ -29,7 +29,7 @@ static size_t H5S_point_fgath (H5F_t *f, const struct H5O_layout_t *layout,
 			       const struct H5O_efl_t *efl, size_t elmt_size,
 			       const H5S_t *file_space,
 			       H5S_sel_iter_t *file_iter, size_t nelmts,
-			       const H5D_xfer_t *xfer_parms,
+			       const H5F_xfer_t *xfer_parms,
 			       void *buf/*out*/);
 static herr_t H5S_point_fscat (H5F_t *f, const struct H5O_layout_t *layout,
 			       const struct H5O_pline_t *pline,
@@ -37,7 +37,7 @@ static herr_t H5S_point_fscat (H5F_t *f, const struct H5O_layout_t *layout,
 			       const struct H5O_efl_t *efl, size_t elmt_size,
 			       const H5S_t *file_space,
 			       H5S_sel_iter_t *file_iter, size_t nelmts,
-			       const H5D_xfer_t *xfer_parms,
+			       const H5F_xfer_t *xfer_parms,
 			       const void *buf);
 static size_t H5S_point_mgath (const void *_buf, size_t elmt_size,
 			       const H5S_t *mem_space,
@@ -270,7 +270,7 @@ H5S_point_fgath (H5F_t *f, const struct H5O_layout_t *layout,
 		 const struct H5O_fill_t *fill, const struct H5O_efl_t *efl,
 		 size_t elmt_size, const H5S_t *file_space,
 		 H5S_sel_iter_t *file_iter, size_t nelmts,
-		 const H5D_xfer_t *xfer_parms, void *_buf/*out*/)
+		 const H5F_xfer_t *xfer_parms, void *_buf/*out*/)
 {
     hssize_t	file_offset[H5O_LAYOUT_NDIMS];	/*offset of slab in file*/
     hsize_t	hsize[H5O_LAYOUT_NDIMS];	/*size of hyperslab	*/
@@ -377,7 +377,7 @@ H5S_point_fscat (H5F_t *f, const struct H5O_layout_t *layout,
 		 const struct H5O_fill_t *fill, const struct H5O_efl_t *efl,
 		 size_t elmt_size, const H5S_t *file_space,
 		 H5S_sel_iter_t *file_iter, size_t nelmts,
-		 const H5D_xfer_t *xfer_parms, const void *_buf)
+		 const H5F_xfer_t *xfer_parms, const void *_buf)
 {
     hssize_t	file_offset[H5O_LAYOUT_NDIMS];	/*offset of hyperslab	*/
     hsize_t	hsize[H5O_LAYOUT_NDIMS];	/*size of hyperslab	*/
diff --git a/src/H5Sprivate.h b/src/H5Sprivate.h
index 2710d9d..ff0a021 100644
--- a/src/H5Sprivate.h
+++ b/src/H5Sprivate.h
@@ -194,7 +194,7 @@ typedef struct H5S_fconv_t {
 		   const struct H5O_fill_t *fill,
 		   const struct H5O_efl_t *efl, size_t elmt_size,
 		   const H5S_t *file_space, H5S_sel_iter_t *file_iter,
-		   size_t nelmts, const struct H5D_xfer_t *xfer_parms,
+		   size_t nelmts, const struct H5F_xfer_t *xfer_parms,
 		   void *tconv_buf/*out*/);
 
     /* Scatter elements from type conversion buffer to disk */
@@ -203,7 +203,7 @@ typedef struct H5S_fconv_t {
 		   const struct H5O_fill_t *fill,
 		   const struct H5O_efl_t *efl, size_t elmt_size,
 		   const H5S_t *file_space, H5S_sel_iter_t *file_iter,
-		   size_t nelmts, const struct H5D_xfer_t *xfer_parms,
+		   size_t nelmts, const struct H5F_xfer_t *xfer_parms,
 		   const void *tconv_buf);
 } H5S_fconv_t;
 
@@ -253,8 +253,8 @@ typedef struct H5S_conv_t {
 		   const struct H5O_pline_t *pline,
 		   const struct H5O_efl_t *efl, size_t elmt_size,
 		   const H5S_t *file_space, const H5S_t *mem_space,
-		   const H5D_transfer_t xfer_mode, void *buf/*out*/,
-		   hbool_t *must_convert/*out*/ );
+		   const H5F_xfer_t *xfer_parms, void *buf/*out*/,
+		   hbool_t *must_convert/*out*/);
 
 
     /* Write directly from app buffer to file */
@@ -262,8 +262,8 @@ typedef struct H5S_conv_t {
 		    const struct H5O_pline_t *pline,
 		    const struct H5O_efl_t *efl, size_t elmt_size,
 		    const H5S_t *file_space, const H5S_t *mem_space,
-		    const H5D_transfer_t xfer_mode, const void *buf,
-		    hbool_t *must_convert/*out*/ );
+		    const H5F_xfer_t *xfer_parms, const void *buf,
+		    hbool_t *must_convert/*out*/);
     
 #ifdef H5S_DEBUG
     struct {
@@ -352,6 +352,18 @@ __DLL__ hsize_t H5S_all_npoints(const H5S_t *space);
 __DLL__ herr_t H5S_all_select_serialize(const H5S_t *space, uint8_t *buf);
 __DLL__ herr_t H5S_all_select_deserialize(H5S_t *space, const uint8_t *buf);
 __DLL__ herr_t H5S_all_bounds(H5S_t *space, hsize_t *start, hsize_t *end);
+__DLL__ herr_t H5S_all_read(H5F_t *f, const struct H5O_layout_t *layout,
+			    const struct H5O_pline_t *pline,
+			    const struct H5O_efl_t *efl, size_t elmt_size,
+			    const H5S_t *file_space, const H5S_t *mem_space,
+			    const H5F_xfer_t *xfer_parms, void *buf/*out*/,
+			    hbool_t *must_convert/*out*/);
+__DLL__ herr_t H5S_all_write(H5F_t *f, const struct H5O_layout_t *layout,
+			     const struct H5O_pline_t *pline,
+			     const struct H5O_efl_t *efl, size_t elmt_size,
+			     const H5S_t *file_space, const H5S_t *mem_space,
+			     const H5F_xfer_t *xfer_parms, const void *buf,
+			     hbool_t *must_convert/*out*/);
 
 /* Hyperslab selection functions */
 __DLL__ herr_t H5S_hyper_add(H5S_t *space, const hssize_t *start,
@@ -386,7 +398,7 @@ __DLL__ herr_t H5S_mpio_spaces_read(H5F_t *f,
 				    const struct H5O_efl_t *efl,
 				    size_t elmt_size, const H5S_t *file_space,
 				    const H5S_t *mem_space,
-				    const H5D_transfer_t xfer_mode,
+				    const H5F_xfer_t *xfer_parms,
 				    void *buf/*out*/,
 				    hbool_t *must_convert /*out*/ );
 
@@ -397,7 +409,7 @@ __DLL__ herr_t H5S_mpio_spaces_write(H5F_t *f,
 				     const struct H5O_efl_t *efl,
 				     size_t elmt_size, const H5S_t *file_space,
 				     const H5S_t *mem_space,
-				     const H5D_transfer_t xfer_mode,
+				     const H5F_xfer_t *xfer_parms,
 				     const void *buf,
 				     hbool_t *must_convert /*out*/ );
 #ifndef _H5S_IN_H5S_C
diff --git a/src/H5Tpublic.h b/src/H5Tpublic.h
index 495c63a..e3b6248 100644
--- a/src/H5Tpublic.h
+++ b/src/H5Tpublic.h
@@ -126,13 +126,6 @@ typedef enum H5T_pad_t {
     H5T_NPAD             = 3    /*THIS MUST BE LAST                          */
 } H5T_pad_t;
 
-/* How is the `bkg' buffer used by the conversion function? */
-typedef enum H5T_bkg_t {
-    H5T_BKG_NO		= 0, 	/*background buffer is not needed, send NULL */
-    H5T_BKG_TEMP	= 1, 	/*bkg buffer used as temp storage only	     */
-    H5T_BKG_YES		= 2	/*init bkg buf with data before conversion   */
-} H5T_bkg_t;
-
 /* Commands sent to conversion functions */
 typedef enum H5T_cmd_t {
     H5T_CONV_INIT	= 0,	/*query and/or initialize private data	     */