H5PB and H5Faccum normalization with develop.

11 files changed, 262 insertions, 187 deletions

diff --git a/src/H5F.c b/src/H5F.c
index 60e4897..83ce5f6 100644
--- a/src/H5F.c
+++ b/src/H5F.c
@@ -1492,38 +1492,39 @@ done:
 
 
 /*-------------------------------------------------------------------------
- * Function: H5Fformat_convert
+ * Function:    H5Fformat_convert (Internal)
  *
- * Purpose:  Downgrade the superblock version to v2 and
- *           downgrade persistent file space to non-persistent
- *           for 1.8 library.
+ * Purpose:     Downgrade the superblock version to v2 and
+ *              downgrade persistent file space to non-persistent
+ *              for 1.8 library.
  *
- * Return:   Non-negative on success/Negative on failure
+ * Return:      Non-negative on success/Negative on failure
  *-------------------------------------------------------------------------
  */
 herr_t
-H5Fformat_convert(hid_t fid)
+H5Fformat_convert(hid_t file_id)
 {
     H5F_t    *f;                     /* File to flush */
-    herr_t    ret_value = SUCCEED;    /* Return value */
+    herr_t          ret_value = SUCCEED;    /* Return value */
 
     FUNC_ENTER_API(FAIL)
-    H5TRACE1("e", "i", fid);
+    H5TRACE1("e", "i", file_id);
 
-    if(H5I_FILE != H5I_get_type(fid))
+    /* Check args */
+    if(H5I_FILE != H5I_get_type(file_id))
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file or file object")
 
     /* Get file object */
-    if(NULL == (f = (H5F_t *)H5I_object(fid)))
-	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid file identifier")
+    if(NULL == (f = (H5F_t *)H5I_object(file_id)))
+        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "file_id parameter is not a valid file identifier")
 
     /* Set up collective metadata if appropriate */
-    if(H5CX_set_loc(fid) < 0)
+    if(H5CX_set_loc(file_id) < 0)
         HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "can't set collective metadata read info")
 
-    /* Call the internal routine */
+    /* Convert the format */
     if(H5F__format_convert(f) < 0)
-	HGOTO_ERROR(H5E_FILE, H5E_CANTCONVERT, FAIL, "unable to convert file format")
+        HGOTO_ERROR(H5E_FILE, H5E_CANTCONVERT, FAIL, "can't convert file format")
 
 done:
     FUNC_LEAVE_API(ret_value)
@@ -1556,7 +1557,7 @@ H5Freset_page_buffering_stats(hid_t file_id)
 
     /* Reset the statistics */
     if(H5PB_reset_stats(file->shared->page_buf) < 0)
-        HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "can't reset stats for page buffering")
+        HGOTO_ERROR(H5E_FILE, H5E_CANTSET, FAIL, "can't reset stats for page buffering")
 
 done:
     FUNC_LEAVE_API(ret_value)
diff --git a/src/H5Faccum.c b/src/H5Faccum.c
index 8d7852b..74a170b 100644
--- a/src/H5Faccum.c
+++ b/src/H5Faccum.c
@@ -111,7 +111,7 @@ H5FL_BLK_DEFINE_STATIC(meta_accum);
  *-------------------------------------------------------------------------
  */
 herr_t
-H5F__accum_read(H5F_t *f, H5FD_mem_t map_type, haddr_t addr,
+H5F__accum_read(H5F_shared_t *f_sh, H5FD_mem_t map_type, haddr_t addr,
     size_t size, void *buf/*out*/)
 {
     H5FD_t *file;                       /* File driver pointer */
@@ -120,18 +120,18 @@ H5F__accum_read(H5F_t *f, H5FD_mem_t map_type, haddr_t addr,
     FUNC_ENTER_PACKAGE
 
     /* Sanity checks */
-    HDassert(f);
+    HDassert(f_sh);
     HDassert(buf);
 
     /* Translate to file driver I/O info object */
-    file = f->shared->lf;
+    file = f_sh->lf;
 
     /* Check if this information is in the metadata accumulator */
-    if((f->shared->feature_flags & H5FD_FEAT_ACCUMULATE_METADATA) && map_type != H5FD_MEM_DRAW) {
+    if((f_sh->feature_flags & H5FD_FEAT_ACCUMULATE_METADATA) && map_type != H5FD_MEM_DRAW) {
         H5F_meta_accum_t *accum;     /* Alias for file's metadata accumulator */
 
         /* Set up alias for file's metadata accumulator info */
-        accum = &f->shared->accum;
+        accum = &f_sh->accum;
 
         if(size < H5F_ACCUM_MAX_SIZE) {
             /* Sanity check */
@@ -419,7 +419,7 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5F__accum_write(H5F_t *f, H5FD_mem_t map_type, haddr_t addr,
+H5F__accum_write(H5F_shared_t *f_sh, H5FD_mem_t map_type, haddr_t addr,
     size_t size, const void *buf)
 {
     H5FD_t *file;                       /* File driver pointer */
@@ -428,19 +428,19 @@ H5F__accum_write(H5F_t *f, H5FD_mem_t map_type, haddr_t addr,
     FUNC_ENTER_NOAPI(FAIL)
 
     /* Sanity checks */
-    HDassert(f);
-    HDassert(H5F_INTENT(f) & H5F_ACC_RDWR);
+    HDassert(f_sh);
+    HDassert(H5F_SHARED_INTENT(f_sh) & H5F_ACC_RDWR);
     HDassert(buf);
 
     /* Translate to file driver pointer */
-    file = f->shared->lf;
+    file = f_sh->lf;
 
     /* Check for accumulating metadata */
-    if((f->shared->feature_flags & H5FD_FEAT_ACCUMULATE_METADATA) && map_type != H5FD_MEM_DRAW) {
+    if((f_sh->feature_flags & H5FD_FEAT_ACCUMULATE_METADATA) && map_type != H5FD_MEM_DRAW) {
         H5F_meta_accum_t *accum;     /* Alias for file's metadata accumulator */
 
         /* Set up alias for file's metadata accumulator info */
-        accum = &f->shared->accum;
+        accum = &f_sh->accum;
 
         if(size < H5F_ACCUM_MAX_SIZE) {
             /* Sanity check */
@@ -732,9 +732,9 @@ H5F__accum_write(H5F_t *f, H5FD_mem_t map_type, haddr_t addr,
         } /* end if */
         else {
             /* Make certain that data in accumulator is visible before new write */
-	    if((H5F_INTENT(f) & H5F_ACC_SWMR_WRITE) > 0)
+	    if((H5F_SHARED_INTENT(f_sh) & H5F_ACC_SWMR_WRITE) > 0)
                 /* Flush if dirty and reset accumulator */
-                if(H5F__accum_reset(f, TRUE) < 0)
+                if(H5F__accum_reset(f_sh, TRUE) < 0)
                     HGOTO_ERROR(H5E_IO, H5E_CANTRESET, FAIL, "can't reset accumulator")
 
             /* Write the data */
@@ -783,7 +783,7 @@ H5F__accum_write(H5F_t *f, H5FD_mem_t map_type, haddr_t addr,
                     } /* end if */
                     else {        /* Access covers whole accumulator */
                         /* Reset accumulator, but don't flush */
-                        if(H5F__accum_reset(f, FALSE) < 0)
+                        if(H5F__accum_reset(f_sh, FALSE) < 0)
                             HGOTO_ERROR(H5E_IO, H5E_CANTRESET, FAIL, "can't reset accumulator")
                     } /* end else */
                 } /* end if */
@@ -847,7 +847,7 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5F__accum_free(H5F_t *f, H5FD_mem_t H5_ATTR_UNUSED type, haddr_t addr,
+H5F__accum_free(H5F_shared_t *f_sh, H5FD_mem_t H5_ATTR_UNUSED type, haddr_t addr,
     hsize_t size)
 {
     H5F_meta_accum_t *accum;            /* Alias for file's metadata accumulator */
@@ -857,16 +857,16 @@ H5F__accum_free(H5F_t *f, H5FD_mem_t H5_ATTR_UNUSED type, haddr_t addr,
     FUNC_ENTER_PACKAGE
 
     /* check arguments */
-    HDassert(f);
+    HDassert(f_sh);
 
     /* Set up alias for file's metadata accumulator info */
-    accum = &f->shared->accum;
+    accum = &f_sh->accum;
 
     /* Translate to file driver pointer */
-    file = f->shared->lf;
+    file = f_sh->lf;
 
     /* Adjust the metadata accumulator to remove the freed block, if it overlaps */
-    if((f->shared->feature_flags & H5FD_FEAT_ACCUMULATE_METADATA)
+    if((f_sh->feature_flags & H5FD_FEAT_ACCUMULATE_METADATA)
             && H5F_addr_overlap(addr, size, accum->loc, accum->size)) {
         size_t overlap_size;        /* Size of overlap with accumulator */
 
@@ -1013,28 +1013,28 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5F__accum_flush(H5F_t *f)
+H5F__accum_flush(H5F_shared_t *f_sh)
 {
     herr_t      ret_value = SUCCEED;    /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
 
     /* Sanity checks */
-    HDassert(f);
+    HDassert(f_sh);
 
     /* Check if we need to flush out the metadata accumulator */
-    if((f->shared->feature_flags & H5FD_FEAT_ACCUMULATE_METADATA) && f->shared->accum.dirty) {
+    if((f_sh->feature_flags & H5FD_FEAT_ACCUMULATE_METADATA) && f_sh->accum.dirty) {
         H5FD_t *file;                       /* File driver pointer */
 
         /* Translate to file driver pointer */
-        file = f->shared->lf;
+        file = f_sh->lf;
 
         /* Flush the metadata contents */
-        if(H5FD_write(file, H5FD_MEM_DEFAULT, f->shared->accum.loc + f->shared->accum.dirty_off, f->shared->accum.dirty_len, f->shared->accum.buf + f->shared->accum.dirty_off) < 0)
+        if(H5FD_write(file, H5FD_MEM_DEFAULT, f_sh->accum.loc + f_sh->accum.dirty_off, f_sh->accum.dirty_len, f_sh->accum.buf + f_sh->accum.dirty_off) < 0)
             HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "file write failed")
 
         /* Reset the dirty flag */
-        f->shared->accum.dirty = FALSE;
+        f_sh->accum.dirty = FALSE;
     } /* end if */
 
 done:
@@ -1056,34 +1056,31 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5F__accum_reset(H5F_t *f, hbool_t flush)
+H5F__accum_reset(H5F_shared_t *f_sh, hbool_t flush)
 {
     herr_t      ret_value = SUCCEED;    /* Return value */
 
     FUNC_ENTER_PACKAGE
 
     /* Sanity checks */
-    HDassert(f);
+    HDassert(f_sh);
 
     /* Flush any dirty data in accumulator, if requested */
     if(flush)
-        if(H5F__accum_flush(f) < 0)
+        if(H5F__accum_flush(f_sh) < 0)
             HGOTO_ERROR(H5E_FILE, H5E_CANTFLUSH, FAIL, "can't flush metadata accumulator")
 
     /* Check if we need to reset the metadata accumulator information */
-    if(f->shared->feature_flags & H5FD_FEAT_ACCUMULATE_METADATA) {
-        /* Sanity check */
-        HDassert(!f->closing || FALSE == f->shared->accum.dirty);
-
+    if(f_sh->feature_flags & H5FD_FEAT_ACCUMULATE_METADATA) {
         /* Free the buffer */
-        if(f->shared->accum.buf)
-            f->shared->accum.buf = H5FL_BLK_FREE(meta_accum, f->shared->accum.buf);
+        if(f_sh->accum.buf)
+            f_sh->accum.buf = H5FL_BLK_FREE(meta_accum, f_sh->accum.buf);
 
         /* Reset the buffer sizes & location */
-        f->shared->accum.alloc_size = f->shared->accum.size = 0;
-        f->shared->accum.loc = HADDR_UNDEF;
-        f->shared->accum.dirty = FALSE;
-        f->shared->accum.dirty_len = 0;
+        f_sh->accum.alloc_size = f_sh->accum.size = 0;
+        f_sh->accum.loc = HADDR_UNDEF;
+        f_sh->accum.dirty = FALSE;
+        f_sh->accum.dirty_len = 0;
     } /* end if */
 
 done:
diff --git a/src/H5Fint.c b/src/H5Fint.c
index fbb1e2e..8760e4c 100644
--- a/src/H5Fint.c
+++ b/src/H5Fint.c
@@ -1277,7 +1277,7 @@ H5F__dest(H5F_t *f, hbool_t flush)
             HDONE_ERROR(H5E_FILE, H5E_CANTRELEASE, FAIL, "problems closing file")
 
         /* Shutdown the page buffer cache */
-        if(H5PB_dest(f) < 0)
+        if(H5PB_dest(f->shared) < 0)
             /* Push error, but keep going*/
             HDONE_ERROR(H5E_FILE, H5E_CANTRELEASE, FAIL, "problems closing page buffer cache")
 
@@ -1298,7 +1298,7 @@ H5F__dest(H5F_t *f, hbool_t flush)
         } /* end if */
 
         /* Destroy other components of the file */
-        if(H5F__accum_reset(f, TRUE) < 0)
+        if(H5F__accum_reset(f->shared, TRUE) < 0)
             /* Push error, but keep going*/
             HDONE_ERROR(H5E_FILE, H5E_CANTRELEASE, FAIL, "problems closing file")
         if(H5FO_dest(f) < 0)
@@ -1631,7 +1631,7 @@ H5F_open(const char *name, unsigned flags, hid_t fcpl_id, hid_t fapl_id)
 
         /* Create the page buffer before initializing the superblock */
         if(page_buf_size)
-            if(H5PB_create(file, page_buf_size, page_buf_min_meta_perc, page_buf_min_raw_perc) < 0)
+            if(H5PB_create(shared, page_buf_size, page_buf_min_meta_perc, page_buf_min_raw_perc) < 0)
                 HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, NULL, "unable to create page buffer")
 
         /* Initialize information about the superblock and allocate space for it */
@@ -1653,7 +1653,7 @@ H5F_open(const char *name, unsigned flags, hid_t fcpl_id, hid_t fapl_id)
 
         /* Create the page buffer before initializing the superblock */
         if(page_buf_size)
-            if(H5PB_create(file, page_buf_size, page_buf_min_meta_perc, page_buf_min_raw_perc) < 0)
+            if(H5PB_create(shared, page_buf_size, page_buf_min_meta_perc, page_buf_min_raw_perc) < 0)
                 HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, NULL, "unable to create page buffer")
 
         /* Open the root group */
@@ -1669,16 +1669,6 @@ H5F_open(const char *name, unsigned flags, hid_t fcpl_id, hid_t fapl_id)
      */
     if(H5P_get(a_plist, H5F_ACS_CLOSE_DEGREE_NAME, &fc_degree) < 0)
         HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get file close degree")
-
-    /* This is a private property to clear the status_flags in the super block */
-    /* Use by h5clear and a routine in test/flush2.c to clear the test file's status_flags */
-    if(H5P_exist_plist(a_plist, H5F_ACS_CLEAR_STATUS_FLAGS_NAME) > 0) {
-        if(H5P_get(a_plist, H5F_ACS_CLEAR_STATUS_FLAGS_NAME, &clear) < 0)
-            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get clearance for status_flags")
-        else if(clear)
-            file->shared->sblock->status_flags = 0;
-    } /* end if */
-
     if(shared->nrefs == 1) {
         if(fc_degree == H5F_CLOSE_DEFAULT)
             shared->fc_degree = lf->cls->fc_degree;
@@ -1692,6 +1682,15 @@ H5F_open(const char *name, unsigned flags, hid_t fcpl_id, hid_t fapl_id)
             HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, NULL, "file close degree doesn't match")
     } /* end if */
 
+    /* This is a private property to clear the status_flags in the super block */
+    /* Use by h5clear and a routine in test/flush2.c to clear the test file's status_flags */
+    if(H5P_exist_plist(a_plist, H5F_ACS_CLEAR_STATUS_FLAGS_NAME) > 0) {
+        if(H5P_get(a_plist, H5F_ACS_CLEAR_STATUS_FLAGS_NAME, &clear) < 0)
+            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get clearance for status_flags")
+        else if(clear)
+            file->shared->sblock->status_flags = 0;
+    } /* end if */
+
     /* Record the evict-on-close MDC behavior.  If it's the first time opening
      * the file, set it to access property list value; if it's the second time
      * or later, verify that the access property list value matches the value
@@ -1862,12 +1861,12 @@ H5F__flush_phase2(H5F_t *f, hbool_t closing)
 #endif /* H5_HAVE_PARALLEL */
 
     /* Flush out the metadata accumulator */
-    if(H5F__accum_flush(f) < 0)
+    if(H5F__accum_flush(f->shared) < 0)
         /* Push error, but keep going*/
         HDONE_ERROR(H5E_IO, H5E_CANTFLUSH, FAIL, "unable to flush metadata accumulator")
 
     /* Flush the page buffer */
-    if(H5PB_flush(f) < 0)
+    if(H5PB_flush(f->shared) < 0)
         /* Push error, but keep going*/
         HDONE_ERROR(H5E_IO, H5E_CANTFLUSH, FAIL, "page buffer flush failed")
 
@@ -3366,7 +3365,7 @@ H5F__start_swmr_write(H5F_t *f)
     } /* end if */
 
     /* Flush and reset the accumulator */
-    if(H5F__accum_reset(f, TRUE) < 0)
+    if(H5F__accum_reset(f->shared, TRUE) < 0)
         HGOTO_ERROR(H5E_IO, H5E_CANTRESET, FAIL, "can't reset accumulator")
 
     /* Turn on SWMR write in shared file open flags */
@@ -3412,7 +3411,6 @@ H5F__start_swmr_write(H5F_t *f)
 
 done:
     if(ret_value < 0 && setup) {
-        HDassert(f);
 
         /* Re-enable accumulator */
         f->shared->feature_flags |= (unsigned)H5FD_FEAT_ACCUMULATE_METADATA;
@@ -3485,30 +3483,31 @@ H5F__format_convert(H5F_t *f)
         f->shared->fs_persist == H5F_FREE_SPACE_PERSIST_DEF &&
         f->shared->fs_threshold == H5F_FREE_SPACE_THRESHOLD_DEF &&
         f->shared->fs_page_size == H5F_FILE_SPACE_PAGE_SIZE_DEF)) {
-    /* Check to remove free-space manager info message from superblock extension */
-    if(H5F_addr_defined(f->shared->sblock->ext_addr))
-        if(H5F__super_ext_remove_msg(f, H5O_FSINFO_ID) < 0)
-        HGOTO_ERROR(H5E_FILE, H5E_CANTRELEASE, FAIL, "error in removing message from superblock extension")
-
-    /* Close freespace manager */
-    if(H5MF_try_close(f) < 0)
-        HGOTO_ERROR(H5E_FILE, H5E_CANTRELEASE, FAIL, "unable to free free-space address")
-
-    /* Set non-persistent freespace manager */
-    f->shared->fs_strategy = H5F_FILE_SPACE_STRATEGY_DEF;
-    f->shared->fs_persist = H5F_FREE_SPACE_PERSIST_DEF;
-    f->shared->fs_threshold = H5F_FREE_SPACE_THRESHOLD_DEF;
-    f->shared->fs_page_size = H5F_FILE_SPACE_PAGE_SIZE_DEF;
-
-    /* Indicate that the superblock should be marked dirty */
-    mark_dirty = TRUE;
+
+        /* Check to remove free-space manager info message from superblock extension */
+        if(H5F_addr_defined(f->shared->sblock->ext_addr))
+            if(H5F__super_ext_remove_msg(f, H5O_FSINFO_ID) < 0)
+                HGOTO_ERROR(H5E_FILE, H5E_CANTRELEASE, FAIL, "error in removing message from superblock extension")
+
+        /* Close freespace manager */
+        if(H5MF_try_close(f) < 0)
+            HGOTO_ERROR(H5E_FILE, H5E_CANTRELEASE, FAIL, "unable to free free-space address")
+
+        /* Set non-persistent freespace manager */
+        f->shared->fs_strategy = H5F_FILE_SPACE_STRATEGY_DEF;
+        f->shared->fs_persist = H5F_FREE_SPACE_PERSIST_DEF;
+        f->shared->fs_threshold = H5F_FREE_SPACE_THRESHOLD_DEF;
+        f->shared->fs_page_size = H5F_FILE_SPACE_PAGE_SIZE_DEF;
+
+        /* Indicate that the superblock should be marked dirty */
+        mark_dirty = TRUE;
     } /* end if */
 
     /* Check if we should mark the superblock dirty */
     if(mark_dirty)
-    /* Mark superblock as dirty */
-    if(H5F_super_dirty(f) < 0)
-        HGOTO_ERROR(H5E_FILE, H5E_CANTMARKDIRTY, FAIL, "unable to mark superblock as dirty")
+        /* Mark superblock as dirty */
+        if(H5F_super_dirty(f) < 0)
+            HGOTO_ERROR(H5E_FILE, H5E_CANTMARKDIRTY, FAIL, "unable to mark superblock as dirty")
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
diff --git a/src/H5Fio.c b/src/H5Fio.c
index 11a9e76..a4a6e01 100644
--- a/src/H5Fio.c
+++ b/src/H5Fio.c
@@ -113,7 +113,7 @@ H5F_block_read(H5F_t *f, H5FD_mem_t type, haddr_t addr, size_t size, void *buf/*
     map_type = (type == H5FD_MEM_GHEAP) ? H5FD_MEM_DRAW : type;
 
     /* Pass through page buffer layer */
-    if(H5PB_read(f, map_type, addr, size, buf) < 0)
+    if(H5PB_read(f->shared, map_type, addr, size, buf) < 0)
         HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "read through page buffer failed")
 
 done:
@@ -159,7 +159,7 @@ H5F_block_write(H5F_t *f, H5FD_mem_t type, haddr_t addr, size_t size, const void
     map_type = (type == H5FD_MEM_GHEAP) ? H5FD_MEM_DRAW : type;
 
     /* Pass through page buffer layer */
-    if(H5PB_write(f, map_type, addr, size, buf) < 0)
+    if(H5PB_write(f->shared, map_type, addr, size, buf) < 0)
         HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "write through page buffer failed")
 
 done:
@@ -192,7 +192,7 @@ H5F_flush_tagged_metadata(H5F_t *f, haddr_t tag)
         HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "unable to flush tagged metadata")
 
     /* Flush and reset the accumulator */
-    if(H5F__accum_reset(f, TRUE) < 0)
+    if(H5F__accum_reset(f->shared, TRUE) < 0)
         HGOTO_ERROR(H5E_IO, H5E_CANTRESET, FAIL, "can't reset accumulator")
 
     /* Flush file buffers to disk. */
diff --git a/src/H5Fpkg.h b/src/H5Fpkg.h
index 1af5995..b73005a 100644
--- a/src/H5Fpkg.h
+++ b/src/H5Fpkg.h
@@ -428,11 +428,11 @@ H5_DLL herr_t H5F__super_ext_remove_msg(H5F_t *f, unsigned id);
 H5_DLL herr_t H5F__super_ext_close(H5F_t *f, H5O_loc_t *ext_ptr, hbool_t was_created);
 
 /* Metadata accumulator routines */
-H5_DLL herr_t H5F__accum_read(H5F_t *f, H5FD_mem_t type, haddr_t addr, size_t size, void *buf);
-H5_DLL herr_t H5F__accum_write(H5F_t *f, H5FD_mem_t type, haddr_t addr, size_t size, const void *buf);
-H5_DLL herr_t H5F__accum_free(H5F_t *f, H5FD_mem_t type, haddr_t addr, hsize_t size);
-H5_DLL herr_t H5F__accum_flush(H5F_t *f);
-H5_DLL herr_t H5F__accum_reset(H5F_t *f, hbool_t flush);
+H5_DLL herr_t H5F__accum_read(H5F_shared_t *f_sh, H5FD_mem_t type, haddr_t addr, size_t size, void *buf);
+H5_DLL herr_t H5F__accum_write(H5F_shared_t *f_sh, H5FD_mem_t type, haddr_t addr, size_t size, const void *buf);
+H5_DLL herr_t H5F__accum_free(H5F_shared_t *f, H5FD_mem_t type, haddr_t addr, hsize_t size);
+H5_DLL herr_t H5F__accum_flush(H5F_shared_t *f_sh);
+H5_DLL herr_t H5F__accum_reset(H5F_shared_t *f_sh, hbool_t flush);
 
 /* Shared file list related routines */
 H5_DLL herr_t H5F__sfile_add(H5F_shared_t *shared);
diff --git a/src/H5Fprivate.h b/src/H5Fprivate.h
index 17317b9..57318a7 100644
--- a/src/H5Fprivate.h
+++ b/src/H5Fprivate.h
@@ -25,13 +25,14 @@ typedef struct H5F_t H5F_t;
 #include "H5Fpublic.h"
 
 /* Public headers needed by this file */
-#include "H5FDpublic.h"        /* File drivers                */
+#include "H5FDpublic.h"         /* File drivers                 */
 
 /* Private headers needed by this file */
+#include "H5MMprivate.h"        /* Memory management            */
 #ifdef H5_HAVE_PARALLEL
-#include "H5Pprivate.h"        /* Property lists            */
+#include "H5Pprivate.h"         /* Property lists               */
 #endif /* H5_HAVE_PARALLEL */
-#include "H5VMprivate.h"        /* Vectors and arrays */
+#include "H5VMprivate.h"        /* Vectors and arrays           */
 
 
 /**************************/
@@ -277,6 +278,7 @@ typedef struct H5F_t H5F_t;
 #ifdef H5F_MODULE
 #define H5F_LOW_BOUND(F)        ((F)->shared->low_bound)
 #define H5F_HIGH_BOUND(F)       ((F)->shared->high_bound)
+#define H5F_SHARED_INTENT(F_SH) ((F_SH)->flags)
 #define H5F_INTENT(F)           ((F)->shared->flags)
 #define H5F_OPEN_NAME(F)        ((F)->open_name)
 #define H5F_ACTUAL_NAME(F)      ((F)->actual_name)
@@ -292,6 +294,7 @@ typedef struct H5F_t H5F_t;
 #define H5F_GET_READ_ATTEMPTS(F) ((F)->shared->read_attempts)
 #define H5F_DRIVER_ID(F)        ((F)->shared->lf->driver_id)
 #define H5F_GET_FILENO(F,FILENUM) ((FILENUM) = (F)->shared->lf->fileno)
+#define H5F_SHARED_HAS_FEATURE(F_SH,FL) ((F_SH)->lf->feature_flags & (FL))
 #define H5F_HAS_FEATURE(F,FL)   ((F)->shared->lf->feature_flags & (FL))
 #define H5F_BASE_ADDR(F)        ((F)->shared->sblock->base_addr)
 #define H5F_SYM_LEAF_K(F)       ((F)->shared->sblock->sym_leaf_k)
@@ -336,6 +339,7 @@ typedef struct H5F_t H5F_t;
 #else /* H5F_MODULE */
 #define H5F_LOW_BOUND(F)        (H5F_get_low_bound(F))
 #define H5F_HIGH_BOUND(F)       (H5F_get_high_bound(F))
+#define H5F_SHARED_INTENT(F_SH) (H5F_shared_get_intent(F_SH))
 #define H5F_INTENT(F)           (H5F_get_intent(F))
 #define H5F_OPEN_NAME(F)        (H5F_get_open_name(F))
 #define H5F_ACTUAL_NAME(F)      (H5F_get_actual_name(F))
@@ -351,6 +355,7 @@ typedef struct H5F_t H5F_t;
 #define H5F_GET_READ_ATTEMPTS(F) (H5F_get_read_attempts(F))
 #define H5F_DRIVER_ID(F)        (H5F_get_driver_id(F))
 #define H5F_GET_FILENO(F,FILENUM) (H5F_get_fileno((F), &(FILENUM)))
+#define H5F_SHARED_HAS_FEATURE(F_SH,FL) (H5F_shared_has_feature(F_SH,FL))
 #define H5F_HAS_FEATURE(F,FL)   (H5F_has_feature(F,FL))
 #define H5F_BASE_ADDR(F)        (H5F_get_base_addr(F))
 #define H5F_SYM_LEAF_K(F)       (H5F_sym_leaf_k(F))
@@ -725,6 +730,7 @@ H5_DLL herr_t H5F_start_swmr_write(H5F_t *file);
 /* Functions that retrieve values from the file struct */
 H5_DLL H5F_libver_t H5F_get_low_bound(const H5F_t *f);
 H5_DLL H5F_libver_t H5F_get_high_bound(const H5F_t *f);
+H5_DLL unsigned H5F_shared_get_intent(const H5F_shared_t *f);
 H5_DLL unsigned H5F_get_intent(const H5F_t *f);
 H5_DLL char *H5F_get_open_name(const H5F_t *f);
 H5_DLL char *H5F_get_actual_name(const H5F_t *f);
@@ -790,7 +796,9 @@ H5_DLL char *H5F_mdc_log_location(const H5F_t *f);
 /* Functions that retrieve values from VFD layer */
 H5_DLL hid_t H5F_get_driver_id(const H5F_t *f);
 H5_DLL herr_t H5F_get_fileno(const H5F_t *f, unsigned long *filenum);
+H5_DLL hbool_t H5F_shared_has_feature(const H5F_shared_t *f, unsigned feature);
 H5_DLL hbool_t H5F_has_feature(const H5F_t *f, unsigned feature);
+H5_DLL haddr_t H5F_shared_get_eoa(const H5F_shared_t *f_sh, H5FD_mem_t type);
 H5_DLL haddr_t H5F_get_eoa(const H5F_t *f, H5FD_mem_t type);
 H5_DLL herr_t H5F_get_vfd_handle(const H5F_t *file, hid_t fapl, void **file_handle);
 
@@ -806,7 +814,7 @@ H5_DLL herr_t H5F_block_write(H5F_t *f, H5FD_mem_t type, haddr_t addr, size_t si
 
 /* Functions that flush or evict */
 H5_DLL herr_t H5F_flush_tagged_metadata(H5F_t *f, haddr_t tag);
-H5_DLL herr_t H5F_evict_tagged_metadata(H5F_t * f, haddr_t tag);
+H5_DLL herr_t H5F_evict_tagged_metadata(H5F_t *f, haddr_t tag);
 
 /* Functions that verify a piece of metadata with checksum */
 H5_DLL herr_t H5F_get_checksums(const uint8_t *buf, size_t chk_size, uint32_t *s_chksum, uint32_t *c_chksum);
diff --git a/src/H5Fquery.c b/src/H5Fquery.c
index 4a1a009..667a2937 100644
--- a/src/H5Fquery.c
+++ b/src/H5Fquery.c
@@ -75,6 +75,28 @@
 
 
 /*-------------------------------------------------------------------------
+ * Function: H5F_shared_get_intent
+ *
+ * Purpose:  Quick and dirty routine to retrieve the file's 'intent' flags
+ *           (Mainly added to stop non-file routines from poking about in the
+ *           H5F_shared_t data structure)
+ *
+ * Return:   'intent' on success/abort on failure (shouldn't fail)
+ *-------------------------------------------------------------------------
+ */
+unsigned
+H5F_shared_get_intent(const H5F_shared_t *f_sh)
+{
+    /* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    HDassert(f_sh);
+
+    FUNC_LEAVE_NOAPI(f_sh->flags)
+} /* end H5F_shared_get_intent() */
+
+
+/*-------------------------------------------------------------------------
  * Function: H5F_get_intent
  *
  * Purpose:  Quick and dirty routine to retrieve the file's 'intent' flags
@@ -827,6 +849,27 @@ H5F_store_msg_crt_idx(const H5F_t *f)
 
 
 /*-------------------------------------------------------------------------
+ * Function: H5F_shared_has_feature
+ *
+ * Purpose:  Check if a file has a particular feature enabled
+ *
+ * Return:   Success:    Non-negative - TRUE or FALSE
+ *           Failure:    Negative (should not happen)
+ *-------------------------------------------------------------------------
+ */
+hbool_t
+H5F_shared_has_feature(const H5F_shared_t *f_sh, unsigned feature)
+{
+    /* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    HDassert(f_sh);
+
+    FUNC_LEAVE_NOAPI((hbool_t)(f_sh->lf->feature_flags & feature))
+} /* end H5F_shared_has_feature() */
+
+
+/*-------------------------------------------------------------------------
  * Function: H5F_has_feature
  *
  * Purpose:  Check if a file has a particular feature enabled
@@ -904,6 +947,32 @@ done:
 
 
 /*-------------------------------------------------------------------------
+ * Function: H5F_shared_get_eoa
+ *
+ * Purpose:  Quick and dirty routine to retrieve the file's 'eoa' value
+ *
+ * Return:   Non-negative on success/Negative on failure
+ *-------------------------------------------------------------------------
+ */
+haddr_t
+H5F_shared_get_eoa(const H5F_shared_t *f_sh, H5FD_mem_t type)
+{
+    haddr_t    ret_value = HADDR_UNDEF;        /* Return value */
+
+    FUNC_ENTER_NOAPI(HADDR_UNDEF)
+
+    HDassert(f_sh);
+
+    /* Dispatch to driver */
+    if(HADDR_UNDEF == (ret_value = H5FD_get_eoa(f_sh->lf, type)))
+        HGOTO_ERROR(H5E_VFL, H5E_CANTINIT, HADDR_UNDEF, "driver get_eoa request failed")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5F_shared_get_eoa() */
+
+
+/*-------------------------------------------------------------------------
  * Function: H5F_get_eoa
  *
  * Purpose:  Quick and dirty routine to retrieve the file's 'eoa' value
diff --git a/src/H5MF.c b/src/H5MF.c
index dac713b..38e84dc 100644
--- a/src/H5MF.c
+++ b/src/H5MF.c
@@ -909,12 +909,12 @@ HDfprintf(stderr, "%s: alloc_type = %u, size = %Hu\n", FUNC, (unsigned)alloc_typ
     H5MF__alloc_to_fs_type(f, alloc_type, size, &ptype);
 
     switch(ptype) {
-	    case H5F_MEM_PAGE_GENERIC:
-	    case H5F_MEM_PAGE_LARGE_BTREE:
-	    case H5F_MEM_PAGE_LARGE_DRAW:
-	    case H5F_MEM_PAGE_LARGE_GHEAP:
-	    case H5F_MEM_PAGE_LARGE_LHEAP:
-	    case H5F_MEM_PAGE_LARGE_OHDR:
+        case H5F_MEM_PAGE_GENERIC:
+        case H5F_MEM_PAGE_LARGE_BTREE:
+        case H5F_MEM_PAGE_LARGE_DRAW:
+        case H5F_MEM_PAGE_LARGE_GHEAP:
+        case H5F_MEM_PAGE_LARGE_LHEAP:
+        case H5F_MEM_PAGE_LARGE_OHDR:
         {
             haddr_t eoa;            /* EOA for the file */
             hsize_t frag_size = 0;  /* Fragment size */
@@ -981,7 +981,7 @@ HDfprintf(stderr, "%s: alloc_type = %u, size = %Hu\n", FUNC, (unsigned)alloc_typ
 
             /* Insert the new page into the Page Buffer list of new pages so
                we don't read an empty page from disk */
-            if(f->shared->page_buf != NULL && H5PB_add_new_page(f, alloc_type, new_page) < 0)
+            if(f->shared->page_buf != NULL && H5PB_add_new_page(f->shared, alloc_type, new_page) < 0)
                 HGOTO_ERROR(H5E_RESOURCE, H5E_CANTINSERT, HADDR_UNDEF, "can't add new page to Page Buffer new page list")
 
             ret_value = new_page;
@@ -1140,7 +1140,7 @@ HDfprintf(stderr, "%s: Entering - alloc_type = %u, addr = %a, size = %Hu\n", FUN
      */
     if(H5FD_MEM_DRAW != alloc_type) {
         /* Check if the space to free intersects with the file's metadata accumulator */
-        if(H5F__accum_free(f, alloc_type, addr, size) < 0)
+        if(H5F__accum_free(f->shared, alloc_type, addr, size) < 0)
             HGOTO_ERROR(H5E_RESOURCE, H5E_CANTFREE, FAIL, "can't check free space intersection w/metadata accumulator")
     } /* end if */
 
diff --git a/src/H5MFsection.c b/src/H5MFsection.c
index a373360..715ece4 100644
--- a/src/H5MFsection.c
+++ b/src/H5MFsection.c
@@ -776,7 +776,7 @@ H5MF__sect_small_merge(H5FS_section_info_t **_sect1, H5FS_section_info_t *_sect2
         /* Note: Large metadata page bypasses the PB cache */
         /* Note: Update of raw data page (large or small sized) is handled by the PB cache */
         if(udata->f->shared->page_buf != NULL && udata->alloc_type != H5FD_MEM_DRAW)
-            if(H5PB_remove_entry(udata->f, (*sect1)->sect_info.addr) < 0)
+            if(H5PB_remove_entry(udata->f->shared, (*sect1)->sect_info.addr) < 0)
                 HGOTO_ERROR(H5E_RESOURCE, H5E_CANTFREE, FAIL, "can't free merged section")
 
         if(H5MF__sect_free((H5FS_section_info_t *)(*sect1)) < 0)
diff --git a/src/H5PB.c b/src/H5PB.c
index 6c61e4c..907fe82 100644
--- a/src/H5PB.c
+++ b/src/H5PB.c
@@ -124,8 +124,8 @@ typedef struct {
 /* Local Prototypes */
 /********************/
 static herr_t H5PB__insert_entry(H5PB_t *page_buf, H5PB_entry_t *page_entry);
-static htri_t H5PB__make_space(H5F_t *f, H5PB_t *page_buf, H5FD_mem_t inserted_type);
-static herr_t H5PB__write_entry(H5F_t *f, H5PB_entry_t *page_entry);
+static htri_t H5PB__make_space(H5F_shared_t *f_sh, H5PB_t *page_buf, H5FD_mem_t inserted_type);
+static herr_t H5PB__write_entry(H5F_shared_t *f_sh, H5PB_entry_t *page_entry);
 
 
 /*********************/
@@ -289,7 +289,7 @@ H5PB_print_stats(const H5PB_t *page_buf)
  *-------------------------------------------------------------------------
  */
 herr_t
-H5PB_create(H5F_t *f, size_t size, unsigned page_buf_min_meta_perc, unsigned page_buf_min_raw_perc)
+H5PB_create(H5F_shared_t *f_sh, size_t size, unsigned page_buf_min_meta_perc, unsigned page_buf_min_raw_perc)
 {
     H5PB_t *page_buf = NULL;
     herr_t ret_value = SUCCEED;    /* Return value */
@@ -297,36 +297,35 @@ H5PB_create(H5F_t *f, size_t size, unsigned page_buf_min_meta_perc, unsigned pag
     FUNC_ENTER_NOAPI(FAIL)
 
     /* Sanity checks */
-    HDassert(f);
-    HDassert(f->shared);
+    HDassert(f_sh);
 
     /* Check args */
-    if(f->shared->fs_strategy != H5F_FSPACE_STRATEGY_PAGE)
+    if(f_sh->fs_strategy != H5F_FSPACE_STRATEGY_PAGE)
         HGOTO_ERROR(H5E_FILE, H5E_CANTINIT, FAIL, "Enabling Page Buffering requires PAGE file space strategy")
     /* round down the size if it is larger than the page size */
-    else if(size > f->shared->fs_page_size) {
+    else if(size > f_sh->fs_page_size) {
         hsize_t temp_size;
 
-        temp_size = (size / f->shared->fs_page_size) * f->shared->fs_page_size;
+        temp_size = (size / f_sh->fs_page_size) * f_sh->fs_page_size;
         H5_CHECKED_ASSIGN(size, size_t, temp_size, hsize_t);
     } /* end if */
-    else if(0 != size % f->shared->fs_page_size)
+    else if(0 != size % f_sh->fs_page_size)
         HGOTO_ERROR(H5E_PAGEBUF, H5E_CANTINIT, FAIL, "Page Buffer size must be >= to the page size")
 
     /* Allocate the new page buffering structure */
     if(NULL == (page_buf = H5FL_CALLOC(H5PB_t)))
-    HGOTO_ERROR(H5E_PAGEBUF, H5E_NOSPACE, FAIL, "memory allocation failed")
+        HGOTO_ERROR(H5E_PAGEBUF, H5E_NOSPACE, FAIL, "memory allocation failed")
 
     page_buf->max_size = size;
-    H5_CHECKED_ASSIGN(page_buf->page_size, size_t, f->shared->fs_page_size, hsize_t);
+    H5_CHECKED_ASSIGN(page_buf->page_size, size_t, f_sh->fs_page_size, hsize_t);
     page_buf->min_meta_perc = page_buf_min_meta_perc;
     page_buf->min_raw_perc = page_buf_min_raw_perc;
 
     /* Calculate the minimum page count for metadata and raw data
      * based on the fractions provided
      */
-    page_buf->min_meta_count = (unsigned)((size * page_buf_min_meta_perc) / (f->shared->fs_page_size * 100));
-    page_buf->min_raw_count = (unsigned)((size * page_buf_min_raw_perc) / (f->shared->fs_page_size * 100));
+    page_buf->min_meta_count = (unsigned)((size * page_buf_min_meta_perc) / (f_sh->fs_page_size * 100));
+    page_buf->min_raw_count = (unsigned)((size * page_buf_min_raw_perc) / (f_sh->fs_page_size * 100));
 
     if(NULL == (page_buf->slist_ptr = H5SL_create(H5SL_TYPE_HADDR, NULL)))
         HGOTO_ERROR(H5E_PAGEBUF, H5E_CANTCREATE, FAIL, "can't create skip list")
@@ -336,7 +335,7 @@ H5PB_create(H5F_t *f, size_t size, unsigned page_buf_min_meta_perc, unsigned pag
     if(NULL == (page_buf->page_fac = H5FL_fac_init(page_buf->page_size)))
         HGOTO_ERROR(H5E_PAGEBUF, H5E_CANTINIT, FAIL, "can't create page factory")
 
-    f->shared->page_buf = page_buf;
+    f_sh->page_buf = page_buf;
 
 done:
     if(ret_value < 0) {
@@ -370,18 +369,18 @@ static herr_t
 H5PB__flush_cb(void *item, void H5_ATTR_UNUSED *key, void *_op_data)
 {
     H5PB_entry_t *page_entry = (H5PB_entry_t *)item;    /* Pointer to page entry node */
-    H5F_t *f = (H5F_t *)_op_data;
+    H5F_shared_t *f_sh = (H5F_shared_t *)_op_data;
     herr_t  ret_value = SUCCEED;    /* Return value */
 
     FUNC_ENTER_STATIC
 
     /* Sanity checks */
     HDassert(page_entry);
-    HDassert(f);
+    HDassert(f_sh);
 
     /* Flush the page if it's dirty */
     if(page_entry->is_dirty)
-        if(H5PB__write_entry(f, page_entry) < 0)
+        if(H5PB__write_entry(f_sh, page_entry) < 0)
             HGOTO_ERROR(H5E_PAGEBUF, H5E_WRITEERROR, FAIL, "file write failed")
 
 done:
@@ -401,21 +400,21 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5PB_flush(H5F_t *f)
+H5PB_flush(H5F_shared_t *f_sh)
 {
     herr_t  ret_value = SUCCEED;    /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
 
     /* Sanity check */
-    HDassert(f);
+    HDassert(f_sh);
 
     /* Flush all the entries in the PB skiplist, if we have write access on the file */
-    if(f->shared->page_buf && (H5F_ACC_RDWR & H5F_INTENT(f))) {
-        H5PB_t *page_buf = f->shared->page_buf;
+    if(f_sh->page_buf && (H5F_ACC_RDWR & H5F_SHARED_INTENT(f_sh))) {
+        H5PB_t *page_buf = f_sh->page_buf;
 
         /* Iterate over all entries in page buffer skip list */
-        if(H5SL_iterate(page_buf->slist_ptr, H5PB__flush_cb, (void *)f))
+        if(H5SL_iterate(page_buf->slist_ptr, H5PB__flush_cb, f_sh))
             HGOTO_ERROR(H5E_PAGEBUF, H5E_BADITER, FAIL, "can't flush page buffer skip list")
     } /* end if */
 
@@ -473,21 +472,21 @@ H5PB__dest_cb(void *item, void H5_ATTR_UNUSED *key, void *_op_data)
  *-------------------------------------------------------------------------
  */
 herr_t
-H5PB_dest(H5F_t *f)
+H5PB_dest(H5F_shared_t *f_sh)
 {
     herr_t  ret_value = SUCCEED;        /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
 
     /* Sanity checks */
-    HDassert(f);
+    HDassert(f_sh);
 
     /* flush and destroy the page buffer, if it exists */
-    if(f->shared->page_buf) {
-        H5PB_t *page_buf = f->shared->page_buf;
+    if(f_sh->page_buf) {
+        H5PB_t *page_buf = f_sh->page_buf;
         H5PB_ud1_t op_data;                 /* Iteration context */
 
-        if(H5PB_flush(f) < 0)
+        if(H5PB_flush(f_sh) < 0)
             HGOTO_ERROR(H5E_PAGEBUF, H5E_CANTFLUSH, FAIL, "can't flush page buffer")
 
         /* Set up context info */
@@ -507,7 +506,7 @@ H5PB_dest(H5F_t *f)
         if(H5FL_fac_term(page_buf->page_fac) < 0)
             HGOTO_ERROR(H5E_PAGEBUF, H5E_CANTRELEASE, FAIL, "can't destroy page buffer page factory")
 
-        f->shared->page_buf = H5FL_FREE(H5PB_t, page_buf);
+        f_sh->page_buf = H5FL_FREE(H5PB_t, page_buf);
     } /* end if */
 
 done:
@@ -530,15 +529,17 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5PB_add_new_page(H5F_t *f, H5FD_mem_t type, haddr_t page_addr)
+H5PB_add_new_page(H5F_shared_t *f_sh, H5FD_mem_t type, haddr_t page_addr)
 {
-    H5PB_t *page_buf = f->shared->page_buf;
-    H5PB_entry_t *page_entry = NULL;    /* pointer to the corresponding page entry */
-    herr_t ret_value = SUCCEED;    /* Return value */
+    H5PB_t *page_buf;                   /* Page buffer to operate on */
+    H5PB_entry_t *page_entry = NULL;    /* Pointer to the corresponding page entry */
+    herr_t ret_value = SUCCEED;         /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
 
     /* Sanity checks */
+    HDassert(f_sh);
+    page_buf = f_sh->page_buf;
     HDassert(page_buf);
 
     /* If there is an existing page, this means that at some point the
@@ -636,15 +637,17 @@ H5PB_update_entry(H5PB_t *page_buf, haddr_t addr, size_t size, const void *buf)
  *-------------------------------------------------------------------------
  */
 herr_t
-H5PB_remove_entry(const H5F_t *f, haddr_t addr)
+H5PB_remove_entry(const H5F_shared_t *f_sh, haddr_t addr)
 {
-    H5PB_t *page_buf = f->shared->page_buf;
-    H5PB_entry_t *page_entry = NULL;        /* pointer to the page entry being searched */
-    herr_t ret_value = SUCCEED;             /* Return value */
+    H5PB_t *page_buf;                   /* Page buffer to operate on */
+    H5PB_entry_t *page_entry = NULL;    /* Pointer to the page entry being searched */
+    herr_t ret_value = SUCCEED;         /* Return value */
 
     FUNC_ENTER_NOAPI(FAIL)
 
     /* Sanity checks */
+    HDassert(f_sh);
+    page_buf = f_sh->page_buf;
     HDassert(page_buf);
 
     /* Search for address in the skip list */
@@ -684,7 +687,7 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5PB_read(H5F_t *f, H5FD_mem_t type, haddr_t addr, size_t size, void *buf/*out*/)
+H5PB_read(H5F_shared_t *f_sh, H5FD_mem_t type, haddr_t addr, size_t size, void *buf/*out*/)
 {
     H5PB_t *page_buf;                   /* Page buffering info for this file */
     H5PB_entry_t *page_entry;           /* Pointer to the corresponding page entry */
@@ -701,21 +704,21 @@ H5PB_read(H5F_t *f, H5FD_mem_t type, haddr_t addr, size_t size, void *buf/*out*/
     FUNC_ENTER_NOAPI(FAIL)
 
     /* Sanity checks */
-    HDassert(f);
+    HDassert(f_sh);
     HDassert(type != H5FD_MEM_GHEAP);
 
     /* Get pointer to page buffer info for this file */
-    page_buf = f->shared->page_buf;
+    page_buf = f_sh->page_buf;
 
 #ifdef H5_HAVE_PARALLEL
-    if(H5F_HAS_FEATURE(f, H5FD_FEAT_HAS_MPI)) {
+    if(H5F_SHARED_HAS_FEATURE(f_sh, H5FD_FEAT_HAS_MPI)) {
 #if 1
         bypass_pb = TRUE;
 #else
         /* MSC - why this stopped working ? */
         int mpi_size;
 
-        if((mpi_size = H5F_mpi_get_size(f)) < 0)
+        if((mpi_size = H5F_shared_mpi_get_size(f_sh)) < 0)
             HGOTO_ERROR(H5E_PAGEBUF, H5E_CANTGET, FAIL, "can't retrieve MPI communicator size")
         if(1 != mpi_size)
             bypass_pb = TRUE;
@@ -729,7 +732,7 @@ H5PB_read(H5F_t *f, H5FD_mem_t type, haddr_t addr, size_t size, void *buf/*out*/
      */
     if(NULL == page_buf || size >= page_buf->page_size ||
            (bypass_pb && H5FD_MEM_DRAW == type)) {
-        if(H5F__accum_read(f, type, addr, size, buf) < 0)
+        if(H5F__accum_read(f_sh, type, addr, size, buf) < 0)
             HGOTO_ERROR(H5E_PAGEBUF, H5E_READERROR, FAIL, "read through metadata accumulator failed")
 
         /* Update statistics */
@@ -780,7 +783,7 @@ H5PB_read(H5F_t *f, H5FD_mem_t type, haddr_t addr, size_t size, void *buf/*out*/
     } /* end else */
 
     /* Translate to file driver I/O info object */
-    file = f->shared->lf;
+    file = f_sh->lf;
 
     /* Copy raw data from dirty pages into the read buffer if the read
        request spans pages in the page buffer*/
@@ -895,7 +898,7 @@ H5PB_read(H5F_t *f, H5FD_mem_t type, haddr_t addr, size_t size, void *buf/*out*/
                     htri_t can_make_space;
 
                     /* check if we can make space in page buffer */
-                    if((can_make_space = H5PB__make_space(f, page_buf, type)) < 0)
+                    if((can_make_space = H5PB__make_space(f_sh, page_buf, type)) < 0)
                         HGOTO_ERROR(H5E_PAGEBUF, H5E_NOSPACE, FAIL, "make space in Page buffer Failed")
 
                     /* if make_space returns 0, then we can't use the page
@@ -920,7 +923,7 @@ H5PB_read(H5F_t *f, H5FD_mem_t type, haddr_t addr, size_t size, void *buf/*out*/
                 /* Read page through the VFD layer, but make sure we don't read past the EOA. */
 
                 /* Retrieve the 'eoa' for the file */
-                if(HADDR_UNDEF == (eoa = H5F_get_eoa(f, type)))
+                if(HADDR_UNDEF == (eoa = H5F_shared_get_eoa(f_sh, type)))
                     HGOTO_ERROR(H5E_PAGEBUF, H5E_CANTGET, FAIL, "driver get_eoa request failed")
 
                 /* If the entire page falls outside the EOA, then fail */
@@ -981,7 +984,7 @@ done:
  *-------------------------------------------------------------------------
  */
 herr_t
-H5PB_write(H5F_t *f, H5FD_mem_t type, haddr_t addr,
+H5PB_write(H5F_shared_t *f_sh, H5FD_mem_t type, haddr_t addr,
     size_t size, const void *buf)
 {
     H5PB_t *page_buf;                   /* Page buffering info for this file */
@@ -999,20 +1002,20 @@ H5PB_write(H5F_t *f, H5FD_mem_t type, haddr_t addr,
     FUNC_ENTER_NOAPI(FAIL)
 
     /* Sanity checks */
-    HDassert(f);
+    HDassert(f_sh);
 
     /* Get pointer to page buffer info for this file */
-    page_buf = f->shared->page_buf;
+    page_buf = f_sh->page_buf;
 
 #ifdef H5_HAVE_PARALLEL
-    if(H5F_HAS_FEATURE(f, H5FD_FEAT_HAS_MPI)) {
+    if(H5F_SHARED_HAS_FEATURE(f_sh, H5FD_FEAT_HAS_MPI)) {
 #if 1
         bypass_pb = TRUE;
 #else
         /* MSC - why this stopped working ? */
         int mpi_size;
 
-        if((mpi_size = H5F_mpi_get_size(f)) < 0)
+        if((mpi_size = H5F_shared_mpi_get_size(f_sh)) < 0)
             HGOTO_ERROR(H5E_PAGEBUF, H5E_CANTGET, FAIL, "can't retrieve MPI communicator size")
         if(1 != mpi_size)
             bypass_pb = TRUE;
@@ -1025,7 +1028,7 @@ H5PB_write(H5F_t *f, H5FD_mem_t type, haddr_t addr,
      * buffering.
      */
     if(NULL == page_buf || size >= page_buf->page_size || bypass_pb) {
-        if(H5F__accum_write(f, type, addr, size, buf) < 0)
+        if(H5F__accum_write(f_sh, type, addr, size, buf) < 0)
             HGOTO_ERROR(H5E_PAGEBUF, H5E_WRITEERROR, FAIL, "write through metadata accumulator failed")
 
         /* Update statistics */
@@ -1084,7 +1087,7 @@ H5PB_write(H5F_t *f, H5FD_mem_t type, haddr_t addr,
     } /* end else */
 
     /* Translate to file driver I/O info object */
-    file = f->shared->lf;
+    file = f_sh->lf;
 
     /* Check if existing pages for raw data need to be updated since raw data access is not atomic */
     if(H5FD_MEM_DRAW == type && size >= page_buf->page_size) {
@@ -1196,7 +1199,7 @@ H5PB_write(H5F_t *f, H5FD_mem_t type, haddr_t addr,
                     htri_t can_make_space;
 
                     /* Check if we can make space in page buffer */
-                    if((can_make_space = H5PB__make_space(f, page_buf, type)) < 0)
+                    if((can_make_space = H5PB__make_space(f_sh, page_buf, type)) < 0)
                         HGOTO_ERROR(H5E_PAGEBUF, H5E_NOSPACE, FAIL, "make space in Page buffer Failed")
 
                     /* If make_space returns 0, then we can't use the page
@@ -1215,7 +1218,7 @@ H5PB_write(H5F_t *f, H5FD_mem_t type, haddr_t addr,
                 } /* end if */
 
                 /* Don't bother searching if there is no write access */
-                if(H5F_ACC_RDWR & H5F_INTENT(f))
+                if(H5F_ACC_RDWR & H5F_SHARED_INTENT(f_sh))
                     /* Lookup & remove the page from the new skip list page if
                      * it exists to see if this is a new page from the MF layer
                      */
@@ -1258,7 +1261,7 @@ H5PB_write(H5F_t *f, H5FD_mem_t type, haddr_t addr,
                     page_entry->type = (H5F_mem_page_t)type;
 
                     /* Retrieve the 'eoa' for the file */
-                    if(HADDR_UNDEF == (eoa = H5F_get_eoa(f, type)))
+                    if(HADDR_UNDEF == (eoa = H5F_shared_get_eoa(f_sh, type)))
                         HGOTO_ERROR(H5E_PAGEBUF, H5E_CANTGET, FAIL, "driver get_eoa request failed")
 
                     /* If the entire page falls outside the EOA, then fail */
@@ -1269,8 +1272,8 @@ H5PB_write(H5F_t *f, H5FD_mem_t type, haddr_t addr,
                      * returned will most likely be HADDR_UNDEF, so skip
                      * that check.
                      */
-                    if(!H5F_HAS_FEATURE(f, H5FD_FEAT_HAS_MPI))
-                        if(HADDR_UNDEF == (eof = H5FD_get_eof(f->shared->lf, H5FD_MEM_DEFAULT)))
+                    if(!H5F_SHARED_HAS_FEATURE(f_sh, H5FD_FEAT_HAS_MPI))
+                        if(HADDR_UNDEF == (eof = H5FD_get_eof(f_sh->lf, H5FD_MEM_DEFAULT)))
                             HGOTO_ERROR(H5E_PAGEBUF, H5E_CANTGET, FAIL, "driver get_eof request failed")
 
                     /* Adjust the read size to not go beyond the EOA */
@@ -1306,7 +1309,7 @@ done:
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5PB_write() */
 
-
+
 /*-------------------------------------------------------------------------
  * Function:    H5PB__insert_entry()
  *
@@ -1375,7 +1378,7 @@ done:
  *-------------------------------------------------------------------------
  */
 static htri_t
-H5PB__make_space(H5F_t *f, H5PB_t *page_buf, H5FD_mem_t inserted_type)
+H5PB__make_space(H5F_shared_t *f_sh, H5PB_t *page_buf, H5FD_mem_t inserted_type)
 {
     H5PB_entry_t *page_entry;   /* Pointer to page eviction candidate */
     htri_t ret_value = TRUE;    /* Return value */
@@ -1383,7 +1386,7 @@ H5PB__make_space(H5F_t *f, H5PB_t *page_buf, H5FD_mem_t inserted_type)
     FUNC_ENTER_STATIC
 
     /* Sanity check */
-    HDassert(f);
+    HDassert(f_sh);
     HDassert(page_buf);
 
     /* Get oldest entry */
@@ -1440,7 +1443,7 @@ H5PB__make_space(H5F_t *f, H5PB_t *page_buf, H5FD_mem_t inserted_type)
 
     /* Flush page if dirty */
     if(page_entry->is_dirty)
-        if(H5PB__write_entry(f, page_entry) < 0)
+        if(H5PB__write_entry(f_sh, page_entry) < 0)
             HGOTO_ERROR(H5E_PAGEBUF, H5E_WRITEERROR, FAIL, "file write failed")
 
     /* Update statistics */
@@ -1473,7 +1476,7 @@ done:
  *-------------------------------------------------------------------------
  */
 static herr_t
-H5PB__write_entry(H5F_t *f, H5PB_entry_t *page_entry)
+H5PB__write_entry(H5F_shared_t *f_sh, H5PB_entry_t *page_entry)
 {
     haddr_t eoa;                    /* Current EOA for the file */
     herr_t ret_value = SUCCEED;    /* Return value */
@@ -1481,11 +1484,11 @@ H5PB__write_entry(H5F_t *f, H5PB_entry_t *page_entry)
     FUNC_ENTER_STATIC
 
     /* Sanity check */
-    HDassert(f);
+    HDassert(f_sh);
     HDassert(page_entry);
 
     /* Retrieve the 'eoa' for the file */
-    if(HADDR_UNDEF == (eoa = H5F_get_eoa(f, (H5FD_mem_t)page_entry->type)))
+    if(HADDR_UNDEF == (eoa = H5F_shared_get_eoa(f_sh, (H5FD_mem_t)page_entry->type)))
         HGOTO_ERROR(H5E_PAGEBUF, H5E_CANTGET, FAIL, "driver get_eoa request failed")
 
     /* If the starting address of the page is larger than
@@ -1493,14 +1496,14 @@ H5PB__write_entry(H5F_t *f, H5PB_entry_t *page_entry)
      */
     if(page_entry->addr <= eoa) {
         H5FD_t *file;                   /* File driver I/O info */
-        size_t page_size = f->shared->page_buf->page_size;
+        size_t page_size = f_sh->page_buf->page_size;
 
         /* Adjust the page length if it exceeds the EOA */
         if((page_entry->addr + page_size) > eoa)
             page_size = (size_t)(eoa - page_entry->addr);
 
         /* Translate to file driver I/O info object */
-        file = f->shared->lf;
+        file = f_sh->lf;
 
         if(H5FD_write(file, (H5FD_mem_t)page_entry->type, page_entry->addr, page_size, page_entry->page_buf_ptr) < 0)
             HGOTO_ERROR(H5E_PAGEBUF, H5E_WRITEERROR, FAIL, "file write failed")
diff --git a/src/H5PBprivate.h b/src/H5PBprivate.h
index aef87e1..82d010d 100644
--- a/src/H5PBprivate.h
+++ b/src/H5PBprivate.h
@@ -85,16 +85,14 @@ typedef struct H5PB_t {
 /***************************************/
 
 /* General routines */
-H5_DLL herr_t H5PB_create(H5F_t *file, size_t page_buffer_size, unsigned page_buf_min_meta_perc, unsigned page_buf_min_raw_perc);
-H5_DLL herr_t H5PB_flush(H5F_t *f);
-H5_DLL herr_t H5PB_dest(H5F_t *f);
-H5_DLL herr_t H5PB_add_new_page(H5F_t *f, H5FD_mem_t type, haddr_t page_addr);
+H5_DLL herr_t H5PB_create(H5F_shared_t *f_sh, size_t page_buffer_size, unsigned page_buf_min_meta_perc, unsigned page_buf_min_raw_perc);
+H5_DLL herr_t H5PB_flush(H5F_shared_t *f_sh);
+H5_DLL herr_t H5PB_dest(H5F_shared_t *f_sh);
+H5_DLL herr_t H5PB_add_new_page(H5F_shared_t *f_sh, H5FD_mem_t type, haddr_t page_addr);
 H5_DLL herr_t H5PB_update_entry(H5PB_t *page_buf, haddr_t addr, size_t size, const void *buf);
-H5_DLL herr_t H5PB_remove_entry(const H5F_t *f, haddr_t addr);
-H5_DLL herr_t H5PB_read(H5F_t *f, H5FD_mem_t type, haddr_t addr, size_t size,
-    void *buf/*out*/);
-H5_DLL herr_t H5PB_write(H5F_t *f, H5FD_mem_t type, haddr_t addr, size_t size,
-    const void *buf);
+H5_DLL herr_t H5PB_remove_entry(const H5F_shared_t *f_sh, haddr_t addr);
+H5_DLL herr_t H5PB_read(H5F_shared_t *f_sh, H5FD_mem_t type, haddr_t addr, size_t size, void *buf/*out*/);
+H5_DLL herr_t H5PB_write(H5F_shared_t *f_sh, H5FD_mem_t type, haddr_t addr, size_t size, const void *buf);
 
 /* Statistics routines */
 H5_DLL herr_t H5PB_reset_stats(H5PB_t *page_buf);