[svn-r16354] Description:

Bring r16353 back from revise_chunks branch:

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

Tested on:
	FreeBSD/32 6.3 (duty)
	(other platforms tested with original patch)

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,
@@ -167,6 +169,31 @@ done:
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5D_efl_new() */
 
+
+/*-------------------------------------------------------------------------
+ * 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