[svn-r16062] Purpose: Allow per-dataset rdcc configuration

Description: Adds 3 new public functions: H5Pset_chunk_cache,
H5Pget_chunk_cache, and H5Dget_access_list.  First implementation of dataset
access properties.  See RFC_chunk_cache_functions for details.

Tested: kagiso, linew, smirom (h5committest)

27 files changed, 514 insertions, 117 deletions

diff --git a/src/H5A.c b/src/H5A.c
index bfe1b9b..0af4aaf 100644
--- a/src/H5A.c
+++ b/src/H5A.c
@@ -2040,7 +2040,7 @@ H5Aiterate_by_name(hid_t loc_id, const char *obj_name, H5_index_t idx_type,
     loc_found = TRUE;
 
     /* Open the object */
-    if((obj_loc_id = H5O_open_by_loc(&obj_loc, H5AC_ind_dxpl_id, TRUE)) < 0)
+    if((obj_loc_id = H5O_open_by_loc(&obj_loc, lapl_id, H5AC_ind_dxpl_id, TRUE)) < 0)
         HGOTO_ERROR(H5E_ATTR, H5E_CANTOPENOBJ, FAIL, "unable to open object")
 
     /* Build attribute operator info */
diff --git a/src/H5D.c b/src/H5D.c
index a6ad488..516103d 100644
--- a/src/H5D.c
+++ b/src/H5D.c
@@ -249,7 +249,7 @@ H5Dcreate_anon(hid_t loc_id, hid_t type_id, hid_t space_id, hid_t dcpl_id,
             HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not dataset access property list")
 
     /* build and open the new dataset */
-    if(NULL == (dset = H5D_create(loc.oloc->file, type_id, space, dcpl_id, H5AC_dxpl_id)))
+    if(NULL == (dset = H5D_create(loc.oloc->file, type_id, space, dcpl_id, dapl_id, H5AC_dxpl_id)))
 	HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to create dataset")
 
     /* Register the new dataset to get an ID for it */
@@ -328,7 +328,7 @@ H5Dopen2(hid_t loc_id, const char *name, hid_t dapl_id)
         HGOTO_ERROR(H5E_DATASET, H5E_BADTYPE, FAIL, "not a dataset")
 
     /* Open the dataset */
-    if((dset = H5D_open(&dset_loc, dxpl_id)) == NULL)
+    if((dset = H5D_open(&dset_loc, dapl_id, dxpl_id)) == NULL)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't open dataset")
 
     /* Register an atom for the dataset */
@@ -652,6 +652,85 @@ done:
 
 
 /*-------------------------------------------------------------------------
+ * Function:	H5Dget_access_plist
+ *
+ * Purpose:	Returns a copy of the dataset creation property list.
+ *
+ * Description: H5Dget_access_plist returns the dataset access property
+ *      list identifier of the specified dataset.
+ *
+ *      The chunk cache parameters in the returned property lists will be
+ *      those used by the dataset.  If the properties in the file access
+ *      property list were used to determine the dataset’s chunk cache
+ *      configuration, then those properties will be present in the
+ *      returned dataset access property list.  If the dataset does not
+ *      use a chunked layout, then the chunk cache properties will be set
+ *      to the default.  The chunk cache properties in the returned list
+ *      are considered to be “set”, and any use of this list will override
+ *      the corresponding properties in the file’s file access property
+ *      list. 
+ *
+ *      All link access properties in the returned list will be set to the
+ *      default values.
+ *
+ * Return:	Success:	ID for a copy of the dataset access
+ *				property list.  The template should be
+ *				released by calling H5Pclose().
+ *
+ *		Failure:	FAIL
+ *
+ * Programmer:	Neil Fortner
+ *		Wednesday, October 29, 2008
+ *
+ *-------------------------------------------------------------------------
+ */
+hid_t
+H5Dget_access_plist(hid_t dset_id)
+{
+    H5D_t           *dset;          /* Dataset structure */
+    H5P_genplist_t  *old_plist;     /* Default DAPL */
+    H5P_genplist_t  *new_plist;     /* New DAPL */
+    hid_t           new_dapl_id = FAIL;
+    hid_t           ret_value;      /* Return value */
+
+    FUNC_ENTER_API(H5Dget_access_plist, FAIL)
+    H5TRACE1("i", "i", dset_id);
+
+    /* Check args */
+    if (NULL == (dset = (H5D_t *)H5I_object_verify(dset_id, H5I_DATASET)))
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset")
+
+    /* Make a copy of the default dataset access property list */
+    if (NULL == (old_plist = (H5P_genplist_t *)H5I_object(H5P_LST_DATASET_ACCESS_g)))
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list")
+    if ((new_dapl_id = H5P_copy_plist(old_plist, TRUE)) < 0)
+        HGOTO_ERROR(H5E_INTERNAL, H5E_CANTINIT, FAIL, "can't copy dataset access property list")
+    if (NULL == (new_plist = (H5P_genplist_t *)H5I_object(new_dapl_id)))
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list")
+
+    /* If the dataset is chunked then copy the rdcc parameters */
+    if (dset->shared->layout.type == H5D_CHUNKED) {
+        if (H5P_set(new_plist, H5D_ACS_DATA_CACHE_NUM_SLOTS_NAME, &(dset->shared->cache.chunk.nslots)) < 0)
+            HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set data cache number of slots")
+        if (H5P_set(new_plist, H5D_ACS_DATA_CACHE_BYTE_SIZE_NAME, &(dset->shared->cache.chunk.nbytes)) < 0)
+            HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set data cache byte size")
+        if (H5P_set(new_plist, H5D_ACS_PREEMPT_READ_CHUNKS_NAME, &(dset->shared->cache.chunk.w0)) < 0)
+            HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set preempt read chunks")
+    } /* end if */
+
+    /* Set the return value */
+    ret_value = new_dapl_id;
+
+done:
+    if(ret_value < 0)
+        if(new_dapl_id >= 0)
+            (void)H5I_dec_ref(new_dapl_id, TRUE);
+
+    FUNC_LEAVE_API(ret_value)
+} /* end H5Dget_access_plist() */
+
+
+/*-------------------------------------------------------------------------
  * Function:	H5Dget_storage_size
  *
  * Purpose:	Returns the amount of storage that is required for the
diff --git a/src/H5Dchunk.c b/src/H5Dchunk.c
index 202da75..d8e13a5 100644
--- a/src/H5Dchunk.c
+++ b/src/H5Dchunk.c
@@ -154,7 +154,7 @@ typedef struct H5D_chunk_it_ud4_t {
 /********************/
 
 /* Chunked layout operation callbacks */
-static herr_t H5D_chunk_new(H5F_t *f, hid_t dxpl_id, H5D_t *dset,
+static herr_t H5D_chunk_new(H5F_t *f, hid_t dapl_id, hid_t dxpl_id, H5D_t *dset,
     const H5P_genplist_t *dc_plist);
 static herr_t H5D_chunk_io_init(const H5D_io_info_t *io_info,
     const H5D_type_info_t *type_info, hsize_t nelmts, const H5S_t *file_space,
@@ -257,7 +257,7 @@ H5FL_DEFINE_STATIC(H5D_chunk_sl_ck_t);
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5D_chunk_new(H5F_t *f, hid_t dxpl_id, H5D_t *dset,
+H5D_chunk_new(H5F_t *f, hid_t dapl_id, hid_t dxpl_id, H5D_t *dset,
     const H5P_genplist_t *dc_plist)
 {
     const H5T_t *type = dset->shared->type;     /* Convenience pointer to dataset's datatype */
@@ -326,7 +326,7 @@ H5D_chunk_new(H5F_t *f, hid_t dxpl_id, H5D_t *dset,
     H5_ASSIGN_OVERFLOW(dset->shared->layout.u.chunk.size, chunk_size, uint64_t, uint32_t);
 
     /* Initialize the chunk cache for the dataset */
-    if(H5D_chunk_init(f, dxpl_id, dset) < 0)
+    if(H5D_chunk_init(f, dapl_id, dxpl_id, dset) < 0)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't initialize chunk cache")
 
 done:
@@ -649,7 +649,7 @@ H5D_chunk_alloc(size_t size, const H5O_pline_t *pline)
 {
     void *ret_value = NULL;		/* Return value */
 
-    FUNC_ENTER_NOAPI_NOINIT(H5D_chunk_alloc)
+    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_chunk_alloc)
 
     HDassert(size);
     HDassert(pline);
@@ -1743,10 +1743,11 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5D_chunk_init(H5F_t *f, hid_t dxpl_id, const H5D_t *dset)
+H5D_chunk_init(H5F_t *f, hid_t dapl_id, hid_t dxpl_id, const H5D_t *dset)
 {
     H5D_chk_idx_info_t idx_info;        /* Chunked index info */
     H5D_rdcc_t	*rdcc = &(dset->shared->cache.chunk);   /* Convenience pointer to dataset's chunk cache */
+    H5P_genplist_t *dapl;               /* Data access property list object pointer */
     herr_t      ret_value = SUCCEED;    /* Return value */
 
     FUNC_ENTER_NOAPI(H5D_chunk_init, FAIL)
@@ -1755,16 +1756,36 @@ H5D_chunk_init(H5F_t *f, hid_t dxpl_id, const H5D_t *dset)
     HDassert(f);
     HDassert(dset);
 
-    if(H5F_RDCC_NBYTES(f) > 0 && H5F_RDCC_NELMTS(f) > 0) {
+    if(NULL == (dapl = (H5P_genplist_t *)H5I_object(dapl_id)))
+        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for fapl ID");
+
+    /* Use the properties in dapl_id if they have been set, otherwise use the properties from the file */
+    if(H5P_get(dapl, H5D_ACS_DATA_CACHE_NUM_SLOTS_NAME, &rdcc->nslots) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET,FAIL, "can't get data cache number of slots");
+    if(rdcc->nslots == H5D_CHUNK_CACHE_NSLOTS_DEFAULT)
+        rdcc->nslots = H5F_RDCC_NSLOTS(f);
+
+    if(H5P_get(dapl, H5D_ACS_DATA_CACHE_BYTE_SIZE_NAME, &rdcc->nbytes) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET,FAIL, "can't get data cache byte size");
+    if(rdcc->nbytes == H5D_CHUNK_CACHE_NBYTES_DEFAULT)
         rdcc->nbytes = H5F_RDCC_NBYTES(f);
-	rdcc->nslots = H5F_RDCC_NELMTS(f);
-	rdcc->slot = H5FL_SEQ_CALLOC(H5D_rdcc_ent_ptr_t, rdcc->nslots);
-	if(NULL == rdcc->slot)
-	    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
+
+    if(H5P_get(dapl, H5D_ACS_PREEMPT_READ_CHUNKS_NAME, &rdcc->w0) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET,FAIL, "can't get preempt read chunks");
+    if(rdcc->w0 < 0)
+        rdcc->w0 = H5F_RDCC_W0(f);
+
+    /* If nbytes or nslots is 0, set them both to 0 and avoid allocating space */
+    if(!rdcc->nbytes || !rdcc->nslots)
+        rdcc->nbytes = rdcc->nslots = 0;
+    else {
+        rdcc->slot = H5FL_SEQ_CALLOC(H5D_rdcc_ent_ptr_t, rdcc->nslots);
+        if(NULL == rdcc->slot)
+            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
 
         /* Reset any cached chunk info for this dataset */
         H5D_chunk_cinfo_cache_reset(&(rdcc->last));
-    } /* end if */
+    } /* end else */
 
     /* Compose chunked index info struct */
     idx_info.f = f;
@@ -2252,7 +2273,7 @@ H5D_chunk_cache_prune(const H5D_t *dset, hid_t dxpl_id,
      * begins.  The pointers participating in the list traversal are each
      * given a chance at preemption before any of the pointers are advanced.
      */
-    w[0] = (int)(rdcc->nused * H5F_RDCC_W0(dset->oloc.file));
+    w[0] = (int)(rdcc->nused * rdcc->w0);
     p[0] = rdcc->head;
     p[1] = NULL;
 
diff --git a/src/H5Dcompact.c b/src/H5Dcompact.c
index 8469442..c48dee4 100644
--- a/src/H5Dcompact.c
+++ b/src/H5Dcompact.c
@@ -57,7 +57,7 @@
 /********************/
 
 /* Layout operation callbacks */
-static herr_t H5D_compact_new(H5F_t *f, hid_t dxpl_id, H5D_t *dset,
+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 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,
@@ -165,7 +165,7 @@ done:
  */
 /* ARGSUSED */
 static herr_t
-H5D_compact_new(H5F_t *f, hid_t UNUSED dxpl_id, H5D_t *dset,
+H5D_compact_new(H5F_t *f, hid_t UNUSED dapl_id, hid_t UNUSED dxpl_id, H5D_t *dset,
     const H5P_genplist_t UNUSED *dc_plist)
 {
     hssize_t tmp_size;          /* Temporary holder for raw data size */
diff --git a/src/H5Dcontig.c b/src/H5Dcontig.c
index 01ee5e2..de79203 100644
--- a/src/H5Dcontig.c
+++ b/src/H5Dcontig.c
@@ -61,7 +61,7 @@
 /********************/
 
 /* Layout operation callbacks */
-static herr_t H5D_contig_new(H5F_t *f, hid_t dxpl_id, H5D_t *dset,
+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 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,
@@ -371,7 +371,7 @@ H5D_contig_get_addr(const H5D_t *dset)
  */
 /* ARGSUSED */
 static herr_t
-H5D_contig_new(H5F_t *f, hid_t UNUSED dxpl_id, H5D_t *dset,
+H5D_contig_new(H5F_t *f, hid_t UNUSED dapl_id, hid_t UNUSED dxpl_id, H5D_t *dset,
     const H5P_genplist_t UNUSED *dc_plist)
 {
     hssize_t tmp_size;                  /* Temporary holder for raw data size */
diff --git a/src/H5Ddeprec.c b/src/H5Ddeprec.c
index b1f6586..5b0621e 100644
--- a/src/H5Ddeprec.c
+++ b/src/H5Ddeprec.c
@@ -209,6 +209,7 @@ H5Dopen1(hid_t loc_id, const char *name)
     H5O_loc_t    oloc;            	/* Dataset object location */
     H5O_type_t   obj_type;              /* Type of object at location */
     hbool_t      loc_found = FALSE;     /* Location at 'name' found */
+    hid_t        dapl_id = H5P_DATASET_ACCESS_DEFAULT; /* dapl to use to open dataset */
     hid_t        dxpl_id = H5AC_dxpl_id;    /* dxpl to use to open datset */
     hid_t        ret_value;
 
@@ -238,7 +239,7 @@ H5Dopen1(hid_t loc_id, const char *name)
         HGOTO_ERROR(H5E_DATASET, H5E_BADTYPE, FAIL, "not a dataset")
 
     /* Open the dataset */
-    if((dset = H5D_open(&dset_loc, dxpl_id)) == NULL)
+    if((dset = H5D_open(&dset_loc, dapl_id, dxpl_id)) == NULL)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't open dataset")
 
     /* Register an atom for the dataset */
diff --git a/src/H5Defl.c b/src/H5Defl.c
index 1fe0f37..2dcad4d 100644
--- a/src/H5Defl.c
+++ b/src/H5Defl.c
@@ -49,7 +49,7 @@
 /********************/
 
 /* Layout operation callbacks */
-static herr_t H5D_efl_new(H5F_t *f, hid_t dxpl_id, H5D_t *dset,
+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 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,
@@ -107,7 +107,7 @@ const H5D_layout_ops_t H5D_LOPS_EFL[1] = {{
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5D_efl_new(H5F_t *f, hid_t UNUSED dxpl_id, H5D_t *dset,
+H5D_efl_new(H5F_t *f, hid_t UNUSED dapl_id, hid_t UNUSED dxpl_id, H5D_t *dset,
     const H5P_genplist_t *dc_plist)
 {
     size_t dt_size;                     /* Size of datatype */
diff --git a/src/H5Dint.c b/src/H5Dint.c
index aa91db5..02be08c 100644
--- a/src/H5Dint.c
+++ b/src/H5Dint.c
@@ -66,7 +66,7 @@ static herr_t H5D_init_type(H5F_t *file, const H5D_t *dset, hid_t type_id,
 static herr_t H5D_init_space(H5F_t *file, const H5D_t *dset, const H5S_t *space);
 static herr_t H5D_set_io_ops(H5D_t *dataset);
 static herr_t H5D_update_oh_info(H5F_t *file, hid_t dxpl_id, H5D_t *dset);
-static herr_t H5D_open_oid(H5D_t *dataset, hid_t dxpl_id);
+static herr_t H5D_open_oid(H5D_t *dataset, hid_t dapl_id, hid_t dxpl_id);
 static herr_t H5D_flush_real(H5D_t *dataset, hid_t dxpl_id, unsigned flags);
 
 
@@ -418,6 +418,7 @@ H5D_create_named(const H5G_loc_t *loc, const char *name, hid_t type_id,
     dcrt_info.type_id = type_id;
     dcrt_info.space = space;
     dcrt_info.dcpl_id = dcpl_id;
+    dcrt_info.dapl_id = dapl_id;
 
     /* Set up object creation information */
     ocrt_info.obj_type = H5O_TYPE_DATASET;
@@ -1001,7 +1002,7 @@ done:
  */
 H5D_t *
 H5D_create(H5F_t *file, hid_t type_id, const H5S_t *space, hid_t dcpl_id,
-    hid_t dxpl_id)
+    hid_t dapl_id, hid_t dxpl_id)
 {
     const H5T_t         *type;                  /* Datatype for dataset */
     H5D_t		*new_dset = NULL;
@@ -1128,7 +1129,7 @@ H5D_create(H5F_t *file, hid_t type_id, const H5S_t *space, hid_t dcpl_id,
         HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to initialize I/O operations")
 
     /* Create the layout information for the new dataset */
-    if((new_dset->shared->layout.ops->new)(file, dxpl_id, new_dset, dc_plist) < 0)
+    if((new_dset->shared->layout.ops->new)(file, dapl_id, dxpl_id, new_dset, dc_plist) < 0)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to initialize layout information")
 
     /* Indicate that the layout information was initialized */
@@ -1198,7 +1199,7 @@ done:
  *-------------------------------------------------------------------------
  */
 H5D_t *
-H5D_open(const H5G_loc_t *loc, hid_t dxpl_id)
+H5D_open(const H5G_loc_t *loc, hid_t dapl_id, hid_t dxpl_id)
 {
     H5D_shared_t    *shared_fo = NULL;
     H5D_t           *dataset = NULL;
@@ -1227,7 +1228,7 @@ H5D_open(const H5G_loc_t *loc, hid_t dxpl_id)
         H5E_clear_stack(NULL);
 
         /* Open the dataset object */
-        if(H5D_open_oid(dataset, dxpl_id) < 0)
+        if(H5D_open_oid(dataset, dapl_id, dxpl_id) < 0)
             HGOTO_ERROR(H5E_DATASET, H5E_NOTFOUND, NULL, "not found")
 
         /* Add the dataset to the list of opened objects in the file */
@@ -1295,7 +1296,7 @@ done:
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5D_open_oid(H5D_t *dataset, hid_t dxpl_id)
+H5D_open_oid(H5D_t *dataset, hid_t dapl_id, hid_t dxpl_id)
 {
     H5P_genplist_t *plist;              /* Property list */
     H5O_fill_t *fill_prop;              /* Pointer to dataset's fill value info */
@@ -1411,7 +1412,7 @@ H5D_open_oid(H5D_t *dataset, hid_t dxpl_id)
                      HGOTO_ERROR(H5E_DATASET, H5E_CANTSET, FAIL, "can't set chunk size")
 
                 /* Initialize the chunk cache for the dataset */
-                if(H5D_chunk_init(dataset->oloc.file, dxpl_id, dataset) < 0)
+                if(H5D_chunk_init(dataset->oloc.file, dapl_id, dxpl_id, dataset) < 0)
                     HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "can't initialize chunk cache")
             }
             break;
diff --git a/src/H5Doh.c b/src/H5Doh.c
index 5268075..88ab971 100644
--- a/src/H5Doh.c
+++ b/src/H5Doh.c
@@ -48,8 +48,8 @@
 static void *H5O_dset_get_copy_file_udata(void);
 static void H5O_dset_free_copy_file_udata(void *);
 static htri_t H5O_dset_isa(H5O_t *loc);
-static hid_t H5O_dset_open(const H5G_loc_t *obj_loc, hid_t dxpl_id,
-    hbool_t app_ref);
+static hid_t H5O_dset_open(const H5G_loc_t *obj_loc, hid_t lapl_id,
+    hid_t dxpl_id, hbool_t app_ref);
 static void *H5O_dset_create(H5F_t *f, void *_crt_info, H5G_loc_t *obj_loc,
     hid_t dxpl_id);
 static H5O_loc_t *H5O_dset_get_oloc(hid_t obj_id);
@@ -220,17 +220,31 @@ done:
  *-------------------------------------------------------------------------
  */
 static hid_t
-H5O_dset_open(const H5G_loc_t *obj_loc, hid_t dxpl_id, hbool_t app_ref)
+H5O_dset_open(const H5G_loc_t *obj_loc, hid_t lapl_id, hid_t dxpl_id, hbool_t app_ref)
 {
     H5D_t       *dset = NULL;           /* Dataset opened */
+    htri_t  isdapl;                 /* lapl_id is a dapl */
+    hid_t   dapl_id;                /* dapl to use to open this dataset */
     hid_t	ret_value;              /* Return value */
 
     FUNC_ENTER_NOAPI_NOINIT(H5O_dset_open)
 
     HDassert(obj_loc);
 
+    /* If the lapl passed in is a dapl, use it.  Otherwise, use the default dapl */
+    if(lapl_id == H5P_DEFAULT)
+        isdapl = FALSE;
+    else
+        if((isdapl = H5P_isa_class(lapl_id, H5P_DATASET_ACCESS)) < 0)
+            HGOTO_ERROR(H5E_PLIST, H5E_CANTCOMPARE, FAIL, "unable to compare property list classes")
+
+    if(isdapl)
+        dapl_id = lapl_id;
+    else
+        dapl_id = H5P_DATASET_ACCESS_DEFAULT;
+
     /* Open the dataset */
-    if(NULL == (dset = H5D_open(obj_loc, dxpl_id)))
+    if(NULL == (dset = H5D_open(obj_loc, dapl_id, dxpl_id)))
         HGOTO_ERROR(H5E_DATASET, H5E_CANTOPENOBJ, FAIL, "unable to open dataset")
 
     /* Register an ID for the dataset */
@@ -274,7 +288,8 @@ H5O_dset_create(H5F_t *f, void *_crt_info, H5G_loc_t *obj_loc, hid_t dxpl_id)
     HDassert(obj_loc);
 
     /* Create the the dqtaset */
-    if(NULL == (dset = H5D_create(f, crt_info->type_id, crt_info->space, crt_info->dcpl_id, dxpl_id)))
+    if(NULL == (dset = H5D_create(f, crt_info->type_id, crt_info->space,
+        crt_info->dcpl_id, crt_info->dapl_id, dxpl_id)))
         HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, NULL, "unable to create dataset")
 
     /* Set up the new dataset's location */
diff --git a/src/H5Dpkg.h b/src/H5Dpkg.h
index 09a3c2c..bbd3a42 100644
--- a/src/H5Dpkg.h
+++ b/src/H5Dpkg.h
@@ -100,7 +100,7 @@ struct H5D_io_info_t;
 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 dxpl_id,
+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 herr_t (*H5D_layout_io_init_func_t)(const struct H5D_io_info_t *io_info,
     const H5D_type_info_t *type_info,
@@ -358,6 +358,7 @@ typedef struct H5D_rdcc_t {
     } stats;
     size_t		nbytes;	/* Current cached raw data in bytes	*/
     size_t		nslots;	/* Number of chunk slots allocated	*/
+    double      w0;     /* Chunk preemption policy          */
     struct H5D_rdcc_ent_t *head; /* Head of doubly linked list		*/
     struct H5D_rdcc_ent_t *tail; /* Tail of doubly linked list		*/
     int		nused;	/* Number of chunk slots in use		*/
@@ -426,6 +427,7 @@ typedef struct {
     hid_t type_id;              /* Datatype for dataset */
     const H5S_t *space;         /* Dataspace for dataset */
     hid_t dcpl_id;              /* Dataset creation property list */
+    hid_t dapl_id;              /* Dataset access property list */
 } H5D_obj_create_t;
 
 /* Typedef for filling a buffer with a fill value */
@@ -502,7 +504,7 @@ H5_DLLVAR const H5D_chunk_ops_t H5D_COPS_ISTORE[1];
 /******************************/
 
 H5_DLL H5D_t *H5D_create(H5F_t *file, hid_t type_id, const H5S_t *space,
-    hid_t dcpl_id, hid_t dxpl_id);
+    hid_t dcpl_id, hid_t dapl_id, hid_t dxpl_id);
 H5_DLL H5D_t *H5D_create_named(const H5G_loc_t *loc, const char *name,
     hid_t type_id, const H5S_t *space, hid_t lcpl_id, hid_t dcpl_id,
     hid_t dapl_id, hid_t dxpl_id);
@@ -563,7 +565,7 @@ H5_DLL herr_t H5D_contig_copy(H5F_t *f_src, const H5O_layout_t *layout_src, H5F_
 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 dxpl_id, const H5D_t *dset);
+H5_DLL herr_t H5D_chunk_init(H5F_t *f, hid_t dapl_id, hid_t dxpl_id, const H5D_t *dset);
 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 dcf3aa3..63aadbb 100644
--- a/src/H5Dprivate.h
+++ b/src/H5Dprivate.h
@@ -50,6 +50,11 @@
 #define H5D_CRT_EXT_FILE_LIST_NAME "efl"                /* External file list */
 #define H5D_CRT_DATA_PIPELINE_NAME "pline"              /* Data filter pipeline */
 
+/* ========  Dataset access property names ======== */
+#define H5D_ACS_DATA_CACHE_NUM_SLOTS_NAME   "rdcc_nslots"   /* Size of raw data chunk cache(slots) */
+#define H5D_ACS_DATA_CACHE_BYTE_SIZE_NAME   "rdcc_nbytes"   /* Size of raw data chunk cache(bytes) */
+#define H5D_ACS_PREEMPT_READ_CHUNKS_NAME    "rdcc_w0"       /* Preemption read chunks first */
+
 /* ======== Data transfer properties ======== */
 #define H5D_XFER_MAX_TEMP_BUF_NAME      "max_temp_buf"  /* Maximum temp buffer size */
 #define H5D_XFER_TCONV_BUF_NAME         "tconv_buf"     /* Type conversion buffer */
@@ -143,7 +148,7 @@ typedef struct H5D_dcpl_cache_t {
 /******************************/
 
 H5_DLL herr_t H5D_init(void);
-H5_DLL H5D_t *H5D_open(const H5G_loc_t *loc, hid_t dxpl_id);
+H5_DLL H5D_t *H5D_open(const H5G_loc_t *loc, hid_t dapl_id, hid_t dxpl_id);
 H5_DLL herr_t H5D_close(H5D_t *dataset);
 H5_DLL H5O_loc_t *H5D_oloc(H5D_t *dataset);
 H5_DLL H5G_name_t *H5D_nameof(H5D_t *dataset);
diff --git a/src/H5Dpublic.h b/src/H5Dpublic.h
index 6c589e3..636c449 100644
--- a/src/H5Dpublic.h
+++ b/src/H5Dpublic.h
@@ -29,6 +29,11 @@
 /* Public Macros */
 /*****************/
 
+/* Macros used to "unset" chunk cache configuration parameters */
+#define H5D_CHUNK_CACHE_NSLOTS_DEFAULT     ((size_t) -1)
+#define H5D_CHUNK_CACHE_NBYTES_DEFAULT      ((size_t) -1)
+#define H5D_CHUNK_CACHE_W0_DEFAULT          -1.
+
 /*******************/
 /* Public Typedefs */
 /*******************/
@@ -101,6 +106,7 @@ H5_DLL hid_t H5Dget_space(hid_t dset_id);
 H5_DLL herr_t H5Dget_space_status(hid_t dset_id, H5D_space_status_t *allocation);
 H5_DLL hid_t H5Dget_type(hid_t dset_id);
 H5_DLL hid_t H5Dget_create_plist(hid_t dset_id);
+H5_DLL hid_t H5Dget_access_plist(hid_t dset_id);
 H5_DLL hsize_t H5Dget_storage_size(hid_t dset_id);
 H5_DLL haddr_t H5Dget_offset(hid_t dset_id);
 H5_DLL herr_t H5Dread(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 327f934..7731966 100644
--- a/src/H5F.c
+++ b/src/H5F.c
@@ -310,8 +310,8 @@ H5F_get_access_plist(H5F_t *f, hbool_t app_ref)
     /* Copy properties of the file access property list */
     if(H5P_set(new_plist, H5F_ACS_META_CACHE_INIT_CONFIG_NAME, &(f->shared->mdc_initCacheCfg)) < 0)
         HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set initial metadata cache resize config.")
-    if(H5P_set(new_plist, H5F_ACS_DATA_CACHE_ELMT_SIZE_NAME, &(f->shared->rdcc_nelmts)) < 0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set data cache element size")
+    if(H5P_set(new_plist, H5F_ACS_DATA_CACHE_NUM_SLOTS_NAME, &(f->shared->rdcc_nslots)) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set data cache number of slots")
     if(H5P_set(new_plist, H5F_ACS_DATA_CACHE_BYTE_SIZE_NAME, &(f->shared->rdcc_nbytes)) < 0)
         HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set data cache byte size")
     if(H5P_set(new_plist, H5F_ACS_PREEMPT_READ_CHUNKS_NAME, &(f->shared->rdcc_w0)) < 0)
@@ -923,10 +923,10 @@ H5F_new(H5F_file_t *shared, hid_t fcpl_id, hid_t fapl_id, H5FD_t *lf)
             HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not file access property list")
         if(H5P_get(plist, H5F_ACS_META_CACHE_INIT_CONFIG_NAME, &(f->shared->mdc_initCacheCfg)) < 0)
             HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get initial metadata cache resize config")
-        if(H5P_get(plist, H5F_ACS_DATA_CACHE_ELMT_SIZE_NAME, &(f->shared->rdcc_nelmts)) < 0)
-            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get data cache element size")
+        if(H5P_get(plist, H5F_ACS_DATA_CACHE_NUM_SLOTS_NAME, &(f->shared->rdcc_nslots)) < 0)
+            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get data cache number of slots")
         if(H5P_get(plist, H5F_ACS_DATA_CACHE_BYTE_SIZE_NAME, &(f->shared->rdcc_nbytes)) < 0)
-            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get data cache cache size")
+            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get data cache byte size")
         if(H5P_get(plist, H5F_ACS_PREEMPT_READ_CHUNKS_NAME, &(f->shared->rdcc_w0)) < 0)
             HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get preempt read chunk")
         if(H5P_get(plist, H5F_ACS_ALIGN_THRHD_NAME, &(f->shared->threshold)) < 0)
diff --git a/src/H5Fpkg.h b/src/H5Fpkg.h
index 428b58d..cc74a80 100644
--- a/src/H5Fpkg.h
+++ b/src/H5Fpkg.h
@@ -145,7 +145,7 @@ typedef struct H5F_file_t {
                                 /* not change thereafter.               */
     hid_t       fcpl_id;	/* File creation property list ID 	*/
     H5F_close_degree_t fc_degree;   /* File close behavior degree	*/
-    size_t	rdcc_nelmts;	/* Size of raw data chunk cache (elmts)	*/
+    size_t	rdcc_nslots;	/* Size of raw data chunk cache (slots)	*/
     size_t	rdcc_nbytes;	/* Size of raw data chunk cache	(bytes)	*/
     double	rdcc_w0;	/* Preempt read chunks first? [0.0..1.0]*/
     size_t      sieve_buf_size; /* Size of the data sieve buffer allocated (in bytes) */
diff --git a/src/H5Fprivate.h b/src/H5Fprivate.h
index 7791296..338e83f 100644
--- a/src/H5Fprivate.h
+++ b/src/H5Fprivate.h
@@ -250,7 +250,7 @@ typedef struct H5F_blk_aggr_t H5F_blk_aggr_t;
 #define H5F_SIZEOF_SIZE(F)      ((F)->shared->sizeof_size)
 #define H5F_SYM_LEAF_K(F)       ((F)->shared->sym_leaf_k)
 #define H5F_KVALUE(F,T)         ((F)->shared->btree_k[(T)->id])
-#define H5F_RDCC_NELMTS(F)      ((F)->shared->rdcc_nelmts)
+#define H5F_RDCC_NSLOTS(F)      ((F)->shared->rdcc_nslots)
 #define H5F_RDCC_NBYTES(F)      ((F)->shared->rdcc_nbytes)
 #define H5F_RDCC_W0(F)          ((F)->shared->rdcc_w0)
 #define H5F_BASE_ADDR(F)        ((F)->shared->base_addr)
@@ -271,7 +271,7 @@ typedef struct H5F_blk_aggr_t H5F_blk_aggr_t;
 #define H5F_SIZEOF_SIZE(F)      (H5F_sizeof_size(F))
 #define H5F_SYM_LEAF_K(F)       (H5F_sym_leaf_k(F))
 #define H5F_KVALUE(F,T)         (H5F_Kvalue(F,T))
-#define H5F_RDCC_NELMTS(F)      (H5F_rdcc_nelmts(F))
+#define H5F_RDCC_NSLOTS(F)      (H5F_rdcc_nslots(F))
 #define H5F_RDCC_NBYTES(F)      (H5F_rdcc_nbytes(F))
 #define H5F_RDCC_W0(F)          (H5F_rdcc_w0(F))
 #define H5F_BASE_ADDR(F)        (H5F_get_base_addr(F))
@@ -358,7 +358,7 @@ typedef struct H5F_blk_aggr_t H5F_blk_aggr_t;
 
 /* ========= File Access properties ============ */
 #define H5F_ACS_META_CACHE_INIT_CONFIG_NAME	"mdc_initCacheCfg" /* Initial metadata cache resize configuration */
-#define H5F_ACS_DATA_CACHE_ELMT_SIZE_NAME       "rdcc_nelmts"   /* Size of raw data chunk cache(elements) */
+#define H5F_ACS_DATA_CACHE_NUM_SLOTS_NAME       "rdcc_nslots"   /* Size of raw data chunk cache(slots) */
 #define H5F_ACS_DATA_CACHE_BYTE_SIZE_NAME       "rdcc_nbytes"   /* Size of raw data chunk cache(bytes) */
 #define H5F_ACS_PREEMPT_READ_CHUNKS_NAME        "rdcc_w0"       /* Preemption read chunks first */
 #define H5F_ACS_ALIGN_THRHD_NAME                "threshold"     /* Threshold for alignment */
@@ -477,7 +477,7 @@ H5_DLL size_t H5F_sizeof_size(const H5F_t *f);
 H5_DLL unsigned H5F_sym_leaf_k(const H5F_t *f);
 H5_DLL unsigned H5F_Kvalue(const H5F_t *f, const struct H5B_class_t *type);
 H5_DLL size_t H5F_rdcc_nbytes(const H5F_t *f);
-H5_DLL size_t H5F_rdcc_nelmts(const H5F_t *f);
+H5_DLL size_t H5F_rdcc_nslots(const H5F_t *f);
 H5_DLL double H5F_rdcc_w0(const H5F_t *f);
 H5_DLL haddr_t H5F_get_base_addr(const H5F_t *f);
 H5_DLL struct H5RC_t *H5F_grp_btree_shared(const H5F_t *f);
diff --git a/src/H5Fquery.c b/src/H5Fquery.c
index 3b93fb5..550a507 100644
--- a/src/H5Fquery.c
+++ b/src/H5Fquery.c
@@ -275,14 +275,14 @@ H5F_Kvalue(const H5F_t *f, const H5B_class_t *type)
 
 
 /*-------------------------------------------------------------------------
- * Function:	H5F_rdcc_nelmts
+ * Function:	H5F_rdcc_nslots
  *
- * Purpose:	Replaced a macro to retrieve the raw data cache number of elments,
+ * Purpose:	Replaced a macro to retrieve the raw data cache number of slots,
  *              now that the generic properties are being used to store
  *              the values.
  *
  * Return:	Success:	Non-negative, and the raw data cache number of
- *                              of elemnts is returned.
+ *                              of slots is returned.
  *
  * 		Failure:	Negative (should not happen)
  *
@@ -293,15 +293,15 @@ H5F_Kvalue(const H5F_t *f, const H5B_class_t *type)
  *-------------------------------------------------------------------------
  */
 size_t
-H5F_rdcc_nelmts(const H5F_t *f)
+H5F_rdcc_nslots(const H5F_t *f)
 {
     /* Use FUNC_ENTER_NOAPI_NOINIT_NOFUNC here to avoid performance issues */
-    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5F_rdcc_nelmts)
+    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5F_rdcc_nslots)
 
     HDassert(f);
     HDassert(f->shared);
 
-    FUNC_LEAVE_NOAPI(f->shared->rdcc_nelmts)
+    FUNC_LEAVE_NOAPI(f->shared->rdcc_nslots)
 } /* end H5F_rdcc_nelmts() */
 
 
diff --git a/src/H5Goh.c b/src/H5Goh.c
index 4f4b651..497badb 100644
--- a/src/H5Goh.c
+++ b/src/H5Goh.c
@@ -46,8 +46,8 @@
 /********************/
 
 static htri_t H5O_group_isa(H5O_t *loc);
-static hid_t H5O_group_open(const H5G_loc_t *obj_loc, hid_t dxpl_id,
-    hbool_t app_ref);
+static hid_t H5O_group_open(const H5G_loc_t *obj_loc, hid_t lapl_id,
+    hid_t dxpl_id, hbool_t app_ref);
 static void *H5O_group_create(H5F_t *f, void *_crt_info, H5G_loc_t *obj_loc,
     hid_t dxpl_id);
 static H5O_loc_t *H5O_group_get_oloc(hid_t obj_id);
@@ -135,7 +135,7 @@ done:
  *-------------------------------------------------------------------------
  */
 static hid_t
-H5O_group_open(const H5G_loc_t *obj_loc, hid_t dxpl_id, hbool_t app_ref)
+H5O_group_open(const H5G_loc_t *obj_loc, hid_t UNUSED lapl_id, hid_t dxpl_id, hbool_t app_ref)
 {
     H5G_t       *grp = NULL;            /* Group opened */
     hid_t	ret_value;              /* Return value */
diff --git a/src/H5O.c b/src/H5O.c
index acd31fb..52338cc 100644
--- a/src/H5O.c
+++ b/src/H5O.c
@@ -309,7 +309,7 @@ H5Oopen_by_idx(hid_t loc_id, const char *group_name, H5_index_t idx_type,
     loc_found = TRUE;
 
     /* Open the object */
-    if((ret_value = H5O_open_by_loc(&obj_loc, H5AC_dxpl_id, TRUE)) < 0)
+    if((ret_value = H5O_open_by_loc(&obj_loc, lapl_id, H5AC_dxpl_id, TRUE)) < 0)
         HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to open object")
 
 done:
@@ -365,6 +365,7 @@ H5Oopen_by_addr(hid_t loc_id, haddr_t addr)
     H5G_name_t  obj_path;            	/* Opened object group hier. path */
     H5O_loc_t   obj_oloc;            	/* Opened object object location */
     hbool_t     loc_found = FALSE;      /* Location at 'name' found */
+    hid_t       lapl_id = H5P_LINK_ACCESS_DEFAULT; /* lapl to use to open this object */
     hid_t       ret_value = FAIL;
 
     FUNC_ENTER_API(H5Oopen_by_addr, FAIL)
@@ -385,7 +386,7 @@ H5Oopen_by_addr(hid_t loc_id, haddr_t addr)
     H5G_name_reset(obj_loc.path);       /* objects opened through this routine don't have a path name */
 
     /* Open the object */
-    if((ret_value = H5O_open_by_loc(&obj_loc, H5AC_dxpl_id, TRUE)) < 0)
+    if((ret_value = H5O_open_by_loc(&obj_loc, lapl_id, H5AC_dxpl_id, TRUE)) < 0)
         HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to open object")
 
 done:
@@ -1286,7 +1287,7 @@ H5O_open_name(H5G_loc_t *loc, const char *name, hid_t lapl_id, hbool_t app_ref)
     loc_found = TRUE;
 
     /* Open the object */
-    if((ret_value = H5O_open_by_loc(&obj_loc, H5AC_ind_dxpl_id, app_ref)) < 0)
+    if((ret_value = H5O_open_by_loc(&obj_loc, lapl_id, H5AC_ind_dxpl_id, app_ref)) < 0)
         HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to open object")
 
 done:
@@ -1312,7 +1313,7 @@ done:
  *-------------------------------------------------------------------------
  */
 hid_t
-H5O_open_by_loc(const H5G_loc_t *obj_loc, hid_t dxpl_id, hbool_t app_ref)
+H5O_open_by_loc(const H5G_loc_t *obj_loc, hid_t lapl_id, hid_t dxpl_id, hbool_t app_ref)
 {
     const H5O_obj_class_t *obj_class;   /* Class of object for location */
     hid_t      ret_value;               /* Return value */
@@ -1327,7 +1328,7 @@ H5O_open_by_loc(const H5G_loc_t *obj_loc, hid_t dxpl_id, hbool_t app_ref)
 
     /* Call the object class's 'open' routine */
     HDassert(obj_class->open);
-    if((ret_value = obj_class->open(obj_loc, dxpl_id, app_ref)) < 0)
+    if((ret_value = obj_class->open(obj_loc, lapl_id, dxpl_id, app_ref)) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_CANTOPENOBJ, FAIL, "unable to open object")
 
 done:
@@ -2803,7 +2804,7 @@ H5O_visit(hid_t loc_id, const char *obj_name, H5_index_t idx_type,
 
     /* Open the object */
     /* (Takes ownership of the obj_loc information) */
-    if((obj_id = H5O_open_by_loc(&obj_loc, dxpl_id, TRUE)) < 0)
+    if((obj_id = H5O_open_by_loc(&obj_loc, lapl_id, dxpl_id, TRUE)) < 0)
         HGOTO_ERROR(H5E_OHDR, H5E_CANTOPENOBJ, FAIL, "unable to open object")
 
     /* Make callback for starting object */
diff --git a/src/H5Opkg.h b/src/H5Opkg.h
index a36ef6f..f15198e 100644
--- a/src/H5Opkg.h
+++ b/src/H5Opkg.h
@@ -308,7 +308,7 @@ typedef struct H5O_obj_class_t {
     void       *(*get_copy_file_udata)(void);	/*retrieve user data for 'copy file' operation */
     void	(*free_copy_file_udata)(void *); /*free user data for 'copy file' operation */
     htri_t	(*isa)(H5O_t *);		/*if a header matches an object class */
-    hid_t	(*open)(const H5G_loc_t *, hid_t, hbool_t );	/*open an object of this class */
+    hid_t	(*open)(const H5G_loc_t *, hid_t, hid_t, hbool_t );	/*open an object of this class */
     void	*(*create)(H5F_t *, void *, H5G_loc_t *, hid_t );	/*create an object of this class */
     H5O_loc_t	*(*get_oloc)(hid_t );		/*get the object header location for an object */
 } H5O_obj_class_t;
@@ -463,7 +463,7 @@ H5_DLLVAR const H5O_obj_class_t H5O_OBJ_DATATYPE[1];
 /* Package-local function prototypes */
 H5_DLL herr_t H5O_msg_flush(H5F_t *f, H5O_t *oh, H5O_mesg_t *mesg);
 H5_DLL herr_t H5O_flush_msgs(H5F_t *f, H5O_t *oh);
-H5_DLL hid_t H5O_open_by_loc(const H5G_loc_t *obj_loc, hid_t dxpl_id, hbool_t app_ref);
+H5_DLL hid_t H5O_open_by_loc(const H5G_loc_t *obj_loc, hid_t lapl_id, hid_t dxpl_id, hbool_t app_ref);
 H5_DLL herr_t H5O_delete_mesg(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh, H5O_mesg_t *mesg);
 H5_DLL const H5O_obj_class_t *H5O_obj_class_real(H5O_t *oh);
 
diff --git a/src/H5Pdapl.c b/src/H5Pdapl.c
new file mode 100644
index 0000000..eefcca6
--- /dev/null
+++ b/src/H5Pdapl.c
@@ -0,0 +1,271 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
+ * access to either file, you may request a copy from help@hdfgroup.org.     *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*-------------------------------------------------------------------------
+ *
+ * Created:		H5Pdapl.c
+ *			October 27, 2008
+ *			Neil Fortner <nfortne2@hdfgroup.org>
+ *
+ * Purpose:		Dataset access property list class routines
+ *
+ *-------------------------------------------------------------------------
+ */
+
+/****************/
+/* Module Setup */
+/****************/
+#define H5P_PACKAGE		/*suppress error about including H5Ppkg	  */
+
+
+/***********/
+/* Headers */
+/***********/
+#include "H5private.h"      /* Generic Functions */
+#include "H5Dprivate.h"     /* Datasets	*/
+#include "H5Eprivate.h"     /* Error handling */
+#include "H5Fprivate.h"		/* Files */
+#include "H5Iprivate.h"     /* IDs */
+#include "H5Ppkg.h"         /* Property lists */
+
+
+/****************/
+/* Local Macros */
+/****************/
+
+/* ========= Dataset Access properties ============ */
+/* Definitions for size of raw data chunk cache(slots) */
+#define H5D_ACS_DATA_CACHE_NUM_SLOTS_SIZE       sizeof(size_t)
+#define H5D_ACS_DATA_CACHE_NUM_SLOTS_DEF        H5D_CHUNK_CACHE_NSLOTS_DEFAULT
+/* Definition for size of raw data chunk cache(bytes) */
+#define H5D_ACS_DATA_CACHE_BYTE_SIZE_SIZE       sizeof(size_t)
+#define H5D_ACS_DATA_CACHE_BYTE_SIZE_DEF        H5D_CHUNK_CACHE_NBYTES_DEFAULT
+/* Definition for preemption read chunks first */
+#define H5D_ACS_PREEMPT_READ_CHUNKS_SIZE        sizeof(double)
+#define H5D_ACS_PREEMPT_READ_CHUNKS_DEF         H5D_CHUNK_CACHE_W0_DEFAULT
+
+
+/******************/
+/* Local Typedefs */
+/******************/
+
+
+/********************/
+/* Package Typedefs */
+/********************/
+
+
+/********************/
+/* Local Prototypes */
+/********************/
+
+/* Property class callbacks */
+static herr_t H5P_dacc_reg_prop(H5P_genclass_t *pclass);
+
+
+/*********************/
+/* Package Variables */
+/*********************/
+
+/* Dataset access property list class library initialization object */
+const H5P_libclass_t H5P_CLS_DACC[1] = {{
+    "dataset access",		/* Class name for debugging     */
+    &H5P_CLS_LINK_ACCESS_g,	/* Parent class ID              */
+    &H5P_CLS_DATASET_ACCESS_g,	/* Pointer to class ID          */
+    &H5P_LST_DATASET_ACCESS_g,	/* Pointer to default property list ID */
+    H5P_dacc_reg_prop,		/* Default property registration routine */
+    NULL,		         /* Class creation callback      */
+    NULL,		        /* Class creation callback info */
+    NULL,		         /* Class copy callback          */
+    NULL,		        /* Class copy callback info     */
+    NULL,		         /* Class close callback         */
+    NULL 		        /* Class close callback info    */
+}};
+
+
+/*****************************/
+/* Library Private Variables */
+/*****************************/
+
+
+/*******************/
+/* Local Variables */
+/*******************/
+
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5P_dacc_reg_prop
+ *
+ * Purpose:     Register the dataset access property list class's
+ *              properties
+ *
+ * Return:      Non-negative on success/Negative on failure
+ *
+ * Programmer:  Neil Fortner
+ *              October 27, 2008
+ *-------------------------------------------------------------------------
+ */
+static herr_t
+H5P_dacc_reg_prop(H5P_genclass_t *pclass)
+{
+    size_t rdcc_nslots = H5D_ACS_DATA_CACHE_NUM_SLOTS_DEF;      /* Default raw data chunk cache # of slots */
+    size_t rdcc_nbytes = H5D_ACS_DATA_CACHE_BYTE_SIZE_DEF;      /* Default raw data chunk cache # of bytes */
+    double rdcc_w0 = H5D_ACS_PREEMPT_READ_CHUNKS_DEF;           /* Default raw data chunk cache dirty ratio */
+    herr_t ret_value = SUCCEED;         /* Return value */
+
+    FUNC_ENTER_NOAPI_NOINIT(H5P_dacc_reg_prop)
+
+    /* Register the size of raw data chunk cache (elements) */
+    if(H5P_register(pclass, H5D_ACS_DATA_CACHE_NUM_SLOTS_NAME, H5D_ACS_DATA_CACHE_NUM_SLOTS_SIZE, &rdcc_nslots, NULL, NULL, NULL, NULL, NULL, NULL, NULL) < 0)
+         HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class")
+
+    /* Register the size of raw data chunk cache(bytes) */
+    if(H5P_register(pclass, H5D_ACS_DATA_CACHE_BYTE_SIZE_NAME, H5D_ACS_DATA_CACHE_BYTE_SIZE_SIZE, &rdcc_nbytes, NULL, NULL, NULL, NULL, NULL, NULL, NULL) < 0)
+         HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class")
+
+    /* Register the preemption for reading chunks */
+    if(H5P_register(pclass, H5D_ACS_PREEMPT_READ_CHUNKS_NAME, H5D_ACS_PREEMPT_READ_CHUNKS_SIZE, &rdcc_w0, NULL, NULL, NULL, NULL, NULL, NULL, NULL) < 0)
+         HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5P_dacc_reg_prop() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5Pset_chunk_cache
+ *
+ * Purpose:	Set the number of objects in the meta data cache and the
+ *		maximum number of chunks and bytes in the raw data chunk cache.
+ *      Once set, these values will override the values in the file access
+ *      property list.  Each of thhese values can be individually unset
+ *      (or not set at all) by passing the macros:
+ *      H5D_CHUNK_CACHE_NCHUNKS_DEFAULT,
+ *      H5D_CHUNK_CACHE_NBYTES_DEFAULT, and/or
+ *      H5D_CHUNK_CACHE_W0_DEFAULT
+ *      as appropriate.
+ *
+ * 		The RDCC_W0 value should be between 0 and 1 inclusive and
+ *		indicates how much chunks that have been fully read or fully
+ *		written are favored for preemption.  A value of zero means
+ *		fully read or written chunks are treated no differently than
+ *		other chunks (the preemption is strictly LRU) while a value
+ *		of one means fully read chunks are always preempted before
+ *		other chunks.
+ *
+ * Return:	Non-negative on success/Negative on failure
+ *
+ * Programmer:	Neil Fortner
+ *              Monday, October 27, 2008
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5Pset_chunk_cache(hid_t dapl_id, size_t rdcc_nslots, size_t rdcc_nbytes, double rdcc_w0)
+{
+    H5P_genplist_t *plist;      /* Property list pointer */
+    herr_t ret_value = SUCCEED; /* return value */
+
+    FUNC_ENTER_API(H5Pset_chunk_cache, FAIL);
+
+    /* Check arguments.  Note that we allow negative values - they are
+     * considered to "unset" the property. */
+    if (rdcc_w0 > 1.0)
+        HGOTO_ERROR (H5E_ARGS, H5E_BADVALUE, FAIL, "raw data cache w0 value must be between 0.0 and 1.0 inclusive, or H5D_CHUNK_CACHE_W0_DEFAULT");
+
+    /* Get the plist structure */
+    if (NULL == (plist = H5P_object_verify(dapl_id,H5P_DATASET_ACCESS)))
+        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID");
+
+    /* Set sizes */
+    if (H5P_set(plist, H5D_ACS_DATA_CACHE_NUM_SLOTS_NAME, &rdcc_nslots) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET,FAIL, "can't set data cache number of chunks");
+    if (H5P_set(plist, H5D_ACS_DATA_CACHE_BYTE_SIZE_NAME, &rdcc_nbytes) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET,FAIL, "can't set data cache byte size");
+    if (H5P_set(plist, H5D_ACS_PREEMPT_READ_CHUNKS_NAME, &rdcc_w0) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET,FAIL, "can't set preempt read chunks");
+
+done:
+    FUNC_LEAVE_API(ret_value);
+}
+
+
+/*-------------------------------------------------------------------------
+ * Function:	H5Pget_chunk_cache
+ *
+ * Purpose:	Retrieves the maximum possible number of elements in the meta
+ *		data cache and the maximum possible number of elements and
+ *		bytes and the RDCC_W0 value in the raw data chunk cache.  Any
+ *		(or all) arguments may be null pointers in which case the
+ *		corresponding datum is not returned.  If these properties have
+ *      not been set on this property list, the default values for a
+ *      file access property list are returned.
+ *
+ * Return:	Non-negative on success/Negative on failure
+ *
+ * Programmer:	Neil Fortner
+ *              Monday, October 27, 2008
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5Pget_chunk_cache(hid_t dapl_id, size_t *rdcc_nslots, size_t *rdcc_nbytes, double *rdcc_w0)
+{
+    H5P_genplist_t *plist;      /* Property list pointer */
+    H5P_genplist_t *def_plist;  /* Default file access property list */
+    herr_t ret_value = SUCCEED; /* return value */
+
+    FUNC_ENTER_API(H5Pget_chunk_cache, FAIL);
+
+    /* Get the plist structure */
+    if (NULL == (plist = H5P_object_verify(dapl_id, H5P_DATASET_ACCESS)))
+        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID");
+
+    /* Get default file access plist */
+    if (NULL == (def_plist = (H5P_genplist_t *)H5I_object(H5P_FILE_ACCESS_DEFAULT)))
+        HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for default fapl ID");
+
+    /* Get the properties.  If a property is set to the default value, the value
+     * from the default fapl is used. */
+    if (rdcc_nslots) {
+        if (H5P_get(plist, H5D_ACS_DATA_CACHE_NUM_SLOTS_NAME, rdcc_nslots) < 0)
+            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET,FAIL, "can't get data cache number of slots");
+        if (*rdcc_nslots == H5D_CHUNK_CACHE_NSLOTS_DEFAULT)
+            if (H5P_get(def_plist, H5F_ACS_DATA_CACHE_NUM_SLOTS_NAME, rdcc_nslots) < 0)
+                HGOTO_ERROR(H5E_PLIST, H5E_CANTGET,FAIL, "can't get default data cache number of slots");
+    } /* end if */
+    if (rdcc_nbytes) {
+        if (H5P_get(plist, H5D_ACS_DATA_CACHE_BYTE_SIZE_NAME, rdcc_nbytes) < 0)
+            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET,FAIL, "can't get data cache byte size");
+        if (*rdcc_nbytes == H5D_CHUNK_CACHE_NBYTES_DEFAULT)
+            if (H5P_get(def_plist, H5F_ACS_DATA_CACHE_BYTE_SIZE_NAME, rdcc_nbytes) < 0)
+                HGOTO_ERROR(H5E_PLIST, H5E_CANTGET,FAIL, "can't get default data cache byte size");
+    } /* end if */
+    if (rdcc_w0) {
+        if (H5P_get(plist, H5D_ACS_PREEMPT_READ_CHUNKS_NAME, rdcc_w0) < 0)
+            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET,FAIL, "can't get preempt read chunks");
+        if (*rdcc_w0 < 0)
+            if (H5P_get(def_plist, H5F_ACS_PREEMPT_READ_CHUNKS_NAME, rdcc_w0) < 0)
+                HGOTO_ERROR(H5E_PLIST, H5E_CANTGET,FAIL, "can't get default preempt read chunks");
+    } /* end if */
+
+done:
+    FUNC_LEAVE_API(ret_value);
+}
diff --git a/src/H5Pfapl.c b/src/H5Pfapl.c
index 8d8177a..c51f750 100644
--- a/src/H5Pfapl.c
+++ b/src/H5Pfapl.c
@@ -57,9 +57,9 @@
 /* Definitions for the initial metadata cache resize configuration */
 #define H5F_ACS_META_CACHE_INIT_CONFIG_SIZE	sizeof(H5AC_cache_config_t)
 #define H5F_ACS_META_CACHE_INIT_CONFIG_DEF	H5AC__DEFAULT_CACHE_CONFIG
-/* Definitions for size of raw data chunk cache(elements) */
-#define H5F_ACS_DATA_CACHE_ELMT_SIZE_SIZE       sizeof(size_t)
-#define H5F_ACS_DATA_CACHE_ELMT_SIZE_DEF        521
+/* Definitions for size of raw data chunk cache(slots) */
+#define H5F_ACS_DATA_CACHE_NUM_SLOTS_SIZE       sizeof(size_t)
+#define H5F_ACS_DATA_CACHE_NUM_SLOTS_DEF        521
 /* Definition for size of raw data chunk cache(bytes) */
 #define H5F_ACS_DATA_CACHE_BYTE_SIZE_SIZE       sizeof(size_t)
 #define H5F_ACS_DATA_CACHE_BYTE_SIZE_DEF        (1024*1024)
@@ -187,7 +187,7 @@ static herr_t
 H5P_facc_reg_prop(H5P_genclass_t *pclass)
 {
     H5AC_cache_config_t mdc_initCacheCfg = H5F_ACS_META_CACHE_INIT_CONFIG_DEF;  /* Default metadata cache settings */
-    size_t rdcc_nelmts = H5F_ACS_DATA_CACHE_ELMT_SIZE_DEF;      /* Default raw data chunk cache # of elements */
+    size_t rdcc_nslots = H5F_ACS_DATA_CACHE_NUM_SLOTS_DEF;      /* Default raw data chunk cache # of slots */
     size_t rdcc_nbytes = H5F_ACS_DATA_CACHE_BYTE_SIZE_DEF;      /* Default raw data chunk cache # of bytes */
     double rdcc_w0 = H5F_ACS_PREEMPT_READ_CHUNKS_DEF;           /* Default raw data chunk cache dirty ratio */
     hsize_t threshold = H5F_ACS_ALIGN_THRHD_DEF;                /* Default allocation alignment threshold */
@@ -213,7 +213,7 @@ H5P_facc_reg_prop(H5P_genclass_t *pclass)
          HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class")
 
     /* Register the size of raw data chunk cache (elements) */
-    if(H5P_register(pclass, H5F_ACS_DATA_CACHE_ELMT_SIZE_NAME, H5F_ACS_DATA_CACHE_ELMT_SIZE_SIZE, &rdcc_nelmts, NULL, NULL, NULL, NULL, NULL, NULL, NULL) < 0)
+    if(H5P_register(pclass, H5F_ACS_DATA_CACHE_NUM_SLOTS_NAME, H5F_ACS_DATA_CACHE_NUM_SLOTS_SIZE, &rdcc_nslots, NULL, NULL, NULL, NULL, NULL, NULL, NULL) < 0)
          HGOTO_ERROR(H5E_PLIST, H5E_CANTINSERT, FAIL, "can't insert property into class")
 
     /* Register the size of raw data chunk cache(bytes) */
@@ -1213,13 +1213,13 @@ done:
  */
 herr_t
 H5Pset_cache(hid_t plist_id, int UNUSED mdc_nelmts,
-	     size_t rdcc_nelmts, size_t rdcc_nbytes, double rdcc_w0)
+	     size_t rdcc_nslots, size_t rdcc_nbytes, double rdcc_w0)
 {
     H5P_genplist_t *plist;      /* Property list pointer */
     herr_t ret_value=SUCCEED;   /* return value */
 
     FUNC_ENTER_API(H5Pset_cache, FAIL);
-    H5TRACE5("e", "iIszzd", plist_id, mdc_nelmts, rdcc_nelmts, rdcc_nbytes,
+    H5TRACE5("e", "iIszzd", plist_id, mdc_nelmts, rdcc_nslots, rdcc_nbytes,
              rdcc_w0);
 
     /* Check arguments */
@@ -1231,8 +1231,8 @@ H5Pset_cache(hid_t plist_id, int UNUSED mdc_nelmts,
         HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID");
 
     /* Set sizes */
-    if(H5P_set(plist, H5F_ACS_DATA_CACHE_ELMT_SIZE_NAME, &rdcc_nelmts) < 0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET,FAIL, "can't set data cache element size");
+    if(H5P_set(plist, H5F_ACS_DATA_CACHE_NUM_SLOTS_NAME, &rdcc_nslots) < 0)
+        HGOTO_ERROR(H5E_PLIST, H5E_CANTSET,FAIL, "can't set data cache number of slots");
     if(H5P_set(plist, H5F_ACS_DATA_CACHE_BYTE_SIZE_NAME, &rdcc_nbytes) < 0)
         HGOTO_ERROR(H5E_PLIST, H5E_CANTSET,FAIL, "can't set data cache byte size");
     if(H5P_set(plist, H5F_ACS_PREEMPT_READ_CHUNKS_NAME, &rdcc_w0) < 0)
@@ -1273,13 +1273,13 @@ done:
  */
 herr_t
 H5Pget_cache(hid_t plist_id, int *mdc_nelmts,
-	     size_t *rdcc_nelmts, size_t *rdcc_nbytes, double *rdcc_w0)
+	     size_t *rdcc_nslots, size_t *rdcc_nbytes, double *rdcc_w0)
 {
     H5P_genplist_t *plist;      /* Property list pointer */
     herr_t ret_value=SUCCEED;   /* return value */
 
     FUNC_ENTER_API(H5Pget_cache, FAIL);
-    H5TRACE5("e", "i*Is*z*z*d", plist_id, mdc_nelmts, rdcc_nelmts, rdcc_nbytes,
+    H5TRACE5("e", "i*Is*z*z*d", plist_id, mdc_nelmts, rdcc_nslots, rdcc_nbytes,
              rdcc_w0);
 
     /* Get the plist structure */
@@ -1292,9 +1292,9 @@ H5Pget_cache(hid_t plist_id, int *mdc_nelmts,
     if (mdc_nelmts)
         *mdc_nelmts = 0;
 
-    if (rdcc_nelmts)
-        if(H5P_get(plist, H5F_ACS_DATA_CACHE_ELMT_SIZE_NAME, rdcc_nelmts) < 0)
-            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET,FAIL, "can't get data cache element size");
+    if (rdcc_nslots)
+        if(H5P_get(plist, H5F_ACS_DATA_CACHE_NUM_SLOTS_NAME, rdcc_nslots) < 0)
+            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET,FAIL, "can't get data cache number of slots");
     if (rdcc_nbytes)
         if(H5P_get(plist, H5F_ACS_DATA_CACHE_BYTE_SIZE_NAME, rdcc_nbytes) < 0)
             HGOTO_ERROR(H5E_PLIST, H5E_CANTGET,FAIL, "can't get data cache byte size");
diff --git a/src/H5Pint.c b/src/H5Pint.c
index e522010..b8c7b4c 100644
--- a/src/H5Pint.c
+++ b/src/H5Pint.c
@@ -142,22 +142,6 @@ const H5P_libclass_t H5P_CLS_GACC[1] = {{
     NULL 		        /* Class close callback info    */
 }};
 
-/* Dataset access property list class library initialization object */
-/* (move to proper source code file when used for real) */
-const H5P_libclass_t H5P_CLS_DACC[1] = {{
-    "dataset access",		/* Class name for debugging     */
-    &H5P_CLS_LINK_ACCESS_g,	/* Parent class ID              */
-    &H5P_CLS_DATASET_ACCESS_g,	/* Pointer to class ID          */
-    &H5P_LST_DATASET_ACCESS_g,	/* Pointer to default property list ID */
-    NULL,			/* Default property registration routine */
-    NULL,		        /* Class creation callback      */
-    NULL,		        /* Class creation callback info */
-    NULL,			/* Class copy callback          */
-    NULL,		        /* Class copy callback info     */
-    NULL,			/* Class close callback         */
-    NULL 		        /* Class close callback info    */
-}};
-
 /* Datatype creation property list class library initialization object */
 /* (move to proper source code file when used for real) */
 const H5P_libclass_t H5P_CLS_TCRT[1] = {{
@@ -200,6 +184,7 @@ H5_DLLVAR const H5P_libclass_t H5P_CLS_OCPY[1];         /* Object copy */
 H5_DLLVAR const H5P_libclass_t H5P_CLS_FCRT[1];         /* File creation */
 H5_DLLVAR const H5P_libclass_t H5P_CLS_FACC[1];         /* File access */
 H5_DLLVAR const H5P_libclass_t H5P_CLS_DCRT[1];         /* Dataset creation */
+H5_DLLVAR const H5P_libclass_t H5P_CLS_DACC[1];         /* Dataset access */
 H5_DLLVAR const H5P_libclass_t H5P_CLS_DXFR[1];         /* Data transfer */
 H5_DLLVAR const H5P_libclass_t H5P_CLS_FMNT[1];         /* File mount */
 H5_DLLVAR const H5P_libclass_t H5P_CLS_ACRT[1];         /* Attribute creation */
diff --git a/src/H5Ppublic.h b/src/H5Ppublic.h
index 0e4e8d3..498eecc 100644
--- a/src/H5Ppublic.h
+++ b/src/H5Ppublic.h
@@ -245,11 +245,11 @@ H5_DLL herr_t H5Pget_family_offset(hid_t fapl_id, hsize_t *offset);
 H5_DLL herr_t H5Pset_multi_type(hid_t fapl_id, H5FD_mem_t type);
 H5_DLL herr_t H5Pget_multi_type(hid_t fapl_id, H5FD_mem_t *type);
 H5_DLL herr_t H5Pset_cache(hid_t plist_id, int mdc_nelmts,
-       size_t rdcc_nelmts, size_t rdcc_nbytes,
+       size_t rdcc_nslots, size_t rdcc_nbytes,
        double rdcc_w0);
 H5_DLL herr_t H5Pget_cache(hid_t plist_id,
        int *mdc_nelmts, /* out */
-       size_t *rdcc_nelmts/*out*/,
+       size_t *rdcc_nslots/*out*/,
        size_t *rdcc_nbytes/*out*/, double *rdcc_w0);
 H5_DLL herr_t H5Pset_mdc_config(hid_t    plist_id,
        H5AC_cache_config_t * config_ptr);
@@ -319,6 +319,14 @@ H5_DLL herr_t H5Pset_fill_time(hid_t plist_id, H5D_fill_time_t fill_time);
 H5_DLL herr_t H5Pget_fill_time(hid_t plist_id, H5D_fill_time_t
 	*fill_time/*out*/);
 
+/* Dataset access property list (DAPL) routines */
+H5_DLL herr_t H5Pset_chunk_cache(hid_t dapl_id, size_t rdcc_nslots,
+       size_t rdcc_nbytes, double rdcc_w0);
+H5_DLL herr_t H5Pget_chunk_cache(hid_t dapl_id,
+       size_t *rdcc_nslots/*out*/,
+       size_t *rdcc_nbytes/*out*/,
+       double *rdcc_w0/*out*/);
+
 /* Dataset xfer property list (DXPL) routines */
 H5_DLL herr_t H5Pset_data_transform(hid_t plist_id, const char* expression);
 H5_DLL ssize_t H5Pget_data_transform(hid_t plist_id, char* expression /*out*/, size_t size);
diff --git a/src/H5R.c b/src/H5R.c
index c324f34..933f983 100644
--- a/src/H5R.c
+++ b/src/H5R.c
@@ -461,10 +461,11 @@ H5R_dereference(H5F_t *file, hid_t dxpl_id, H5R_type_t ref_type, const void *_re
 
         case H5O_TYPE_DATASET:
             {
+                hid_t dapl_id = H5P_DATASET_ACCESS_DEFAULT; /* dapl to use to open dataset */
                 H5D_t *dset;                /* Pointer to dataset to open */
 
                 /* Open the dataset */
-                if(NULL == (dset = H5D_open(&loc, dxpl_id)))
+                if(NULL == (dset = H5D_open(&loc, dapl_id, dxpl_id)))
                     HGOTO_ERROR(H5E_DATASET, H5E_NOTFOUND, FAIL, "not found")
 
                 /* Create an atom for the dataset */
diff --git a/src/H5Toh.c b/src/H5Toh.c
index 1ab95f2..24fc0f1 100644
--- a/src/H5Toh.c
+++ b/src/H5Toh.c
@@ -46,8 +46,8 @@
 /********************/
 
 static htri_t H5O_dtype_isa(H5O_t *loc);
-static hid_t H5O_dtype_open(const H5G_loc_t *obj_loc, hid_t dxpl_id,
-    hbool_t app_ref);
+static hid_t H5O_dtype_open(const H5G_loc_t *obj_loc, hid_t lapl_id,
+    hid_t dxpl_id, hbool_t app_ref);
 static void *H5O_dtype_create(H5F_t *f, void *_crt_info, H5G_loc_t *obj_loc,
     hid_t dxpl_id);
 static H5O_loc_t *H5O_dtype_get_oloc(hid_t obj_id);
@@ -128,7 +128,7 @@ done:
  *-------------------------------------------------------------------------
  */
 static hid_t
-H5O_dtype_open(const H5G_loc_t *obj_loc, hid_t dxpl_id, hbool_t app_ref)
+H5O_dtype_open(const H5G_loc_t *obj_loc, hid_t UNUSED lapl_id, hid_t dxpl_id, hbool_t app_ref)
 {
     H5T_t       *type = NULL;           /* Datatype opened */
     hid_t	ret_value;              /* Return value */
diff --git a/src/Makefile.am b/src/Makefile.am
index 3f6c1bb..ccdb189 100755
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -81,7 +81,7 @@ libhdf5_la_SOURCES= H5.c H5checksum.c H5dbg.c H5system.c H5timer.c H5trace.c \
         H5Oname.c H5Onull.c H5Opline.c H5Orefcount.c \
         H5Osdspace.c H5Oshared.c H5Ostab.c \
         H5Oshmesg.c H5Otest.c H5Ounknown.c \
-        H5P.c H5Pacpl.c H5Pdcpl.c \
+        H5P.c H5Pacpl.c H5Pdapl.c H5Pdcpl.c \
         H5Pdeprec.c H5Pdxpl.c H5Pfapl.c H5Pfcpl.c H5Pfmpl.c \
         H5Pgcpl.c H5Pint.c \
         H5Plapl.c H5Plcpl.c H5Pocpl.c H5Pocpypl.c H5Pstrcpl.c H5Ptest.c \
diff --git a/src/Makefile.in b/src/Makefile.in
index 7ac3590..03c463d 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -111,20 +111,20 @@ am_libhdf5_la_OBJECTS = H5.lo H5checksum.lo H5dbg.lo H5system.lo \
 	H5Olink.lo H5Omessage.lo H5Omtime.lo H5Oname.lo H5Onull.lo \
 	H5Opline.lo H5Orefcount.lo H5Osdspace.lo H5Oshared.lo \
 	H5Ostab.lo H5Oshmesg.lo H5Otest.lo H5Ounknown.lo H5P.lo \
-	H5Pacpl.lo H5Pdcpl.lo H5Pdeprec.lo H5Pdxpl.lo H5Pfapl.lo \
-	H5Pfcpl.lo H5Pfmpl.lo H5Pgcpl.lo H5Pint.lo H5Plapl.lo \
-	H5Plcpl.lo H5Pocpl.lo H5Pocpypl.lo H5Pstrcpl.lo H5Ptest.lo \
-	H5R.lo H5Rdeprec.lo H5RC.lo H5RS.lo H5S.lo H5Sall.lo H5Sdbg.lo \
-	H5Shyper.lo H5Smpio.lo H5Snone.lo H5Spoint.lo H5Sselect.lo \
-	H5Stest.lo H5SL.lo H5SM.lo H5SMbtree2.lo H5SMcache.lo \
-	H5SMtest.lo H5ST.lo H5T.lo H5Tarray.lo H5Tbit.lo H5Tcommit.lo \
-	H5Tcompound.lo H5Tconv.lo H5Tcset.lo H5Tdbg.lo H5Tdeprec.lo \
-	H5Tenum.lo H5Tfields.lo H5Tfixed.lo H5Tfloat.lo H5Tinit.lo \
-	H5Tnative.lo H5Toffset.lo H5Toh.lo H5Topaque.lo H5Torder.lo \
-	H5Tpad.lo H5Tprecis.lo H5Tstrpad.lo H5Tvisit.lo H5Tvlen.lo \
-	H5TS.lo H5V.lo H5WB.lo H5Z.lo H5Zdeflate.lo H5Zfletcher32.lo \
-	H5Znbit.lo H5Zshuffle.lo H5Zszip.lo H5Zscaleoffset.lo \
-	H5Ztrans.lo
+	H5Pacpl.lo H5Pdapl.lo H5Pdcpl.lo H5Pdeprec.lo H5Pdxpl.lo \
+	H5Pfapl.lo H5Pfcpl.lo H5Pfmpl.lo H5Pgcpl.lo H5Pint.lo \
+	H5Plapl.lo H5Plcpl.lo H5Pocpl.lo H5Pocpypl.lo H5Pstrcpl.lo \
+	H5Ptest.lo H5R.lo H5Rdeprec.lo H5RC.lo H5RS.lo H5S.lo \
+	H5Sall.lo H5Sdbg.lo H5Shyper.lo H5Smpio.lo H5Snone.lo \
+	H5Spoint.lo H5Sselect.lo H5Stest.lo H5SL.lo H5SM.lo \
+	H5SMbtree2.lo H5SMcache.lo H5SMtest.lo H5ST.lo H5T.lo \
+	H5Tarray.lo H5Tbit.lo H5Tcommit.lo H5Tcompound.lo H5Tconv.lo \
+	H5Tcset.lo H5Tdbg.lo H5Tdeprec.lo H5Tenum.lo H5Tfields.lo \
+	H5Tfixed.lo H5Tfloat.lo H5Tinit.lo H5Tnative.lo H5Toffset.lo \
+	H5Toh.lo H5Topaque.lo H5Torder.lo H5Tpad.lo H5Tprecis.lo \
+	H5Tstrpad.lo H5Tvisit.lo H5Tvlen.lo H5TS.lo H5V.lo H5WB.lo \
+	H5Z.lo H5Zdeflate.lo H5Zfletcher32.lo H5Znbit.lo H5Zshuffle.lo \
+	H5Zszip.lo H5Zscaleoffset.lo H5Ztrans.lo
 libhdf5_la_OBJECTS = $(am_libhdf5_la_OBJECTS)
 libhdf5_la_LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) \
 	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
@@ -464,7 +464,7 @@ libhdf5_la_SOURCES = H5.c H5checksum.c H5dbg.c H5system.c H5timer.c H5trace.c \
         H5Oname.c H5Onull.c H5Opline.c H5Orefcount.c \
         H5Osdspace.c H5Oshared.c H5Ostab.c \
         H5Oshmesg.c H5Otest.c H5Ounknown.c \
-        H5P.c H5Pacpl.c H5Pdcpl.c \
+        H5P.c H5Pacpl.c H5Pdapl.c H5Pdcpl.c \
         H5Pdeprec.c H5Pdxpl.c H5Pfapl.c H5Pfcpl.c H5Pfmpl.c \
         H5Pgcpl.c H5Pint.c \
         H5Plapl.c H5Plcpl.c H5Pocpl.c H5Pocpypl.c H5Pstrcpl.c H5Ptest.c \
@@ -777,6 +777,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Ounknown.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5P.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Pacpl.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Pdapl.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Pdcpl.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Pdeprec.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/H5Pdxpl.Plo@am__quote@