[svn-r17891] Description:

	Switch the shared object header messages code to use the refactored
v2 B-tree routines.  (this should be the interface that is using them)

Tested on:
        FreeBSD/32 6.3 (duty) in debug mode
        FreeBSD/64 6.3 (liberty) w/C++ & FORTRAN, in debug mode
        Linux/32 2.6 (jam) w/PGI compilers, w/default API=1.8.x,
                w/C++ & FORTRAN, w/threadsafe, in debug mode
        Linux/64-amd64 2.6 (smirom) w/Intel compilers, w/default API=1.6.x,
                w/C++ & FORTRAN, in production mode
        Solaris/32 2.10 (linew) w/deprecated symbols disabled, w/C++ & FORTRAN,
                w/szip filter, in production mode
        Linux/64-ia64 2.6 (cobalt) w/Intel compilers, w/C++ & FORTRAN,
                in production mode
        Linux/64-ia64 2.4 (tg-login3) w/parallel, w/FORTRAN, in debug mode
        Linux/64-amd64 2.6 (abe) w/parallel, w/FORTRAN, in production mode
        Mac OS X/32 10.6.2 (amazon) in debug mode
        Mac OS X/32 10.6.2 (amazon) w/C++ & FORTRAN, w/threadsafe,
                in production mode

1 files changed, 202 insertions, 134 deletions

diff --git a/src/H5SM.c b/src/H5SM.c
index d05c73d..a2e46d5 100755
--- a/src/H5SM.c
+++ b/src/H5SM.c
@@ -141,31 +141,31 @@ H5SM_init(H5F_t *f, H5P_genplist_t * fc_plist, const H5O_loc_t *ext_loc, hid_t d
 
     /* Get information from fcpl */
     if(H5P_get(fc_plist, H5F_CRT_SHMSG_NINDEXES_NAME, &num_indexes)<0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get number of indexes")
+        HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "can't get number of indexes")
     if(H5P_get(fc_plist, H5F_CRT_SHMSG_INDEX_TYPES_NAME, &index_type_flags)<0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get SOHM type flags")
+        HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "can't get SOHM type flags")
     if(H5P_get(fc_plist, H5F_CRT_SHMSG_LIST_MAX_NAME, &list_max)<0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get SOHM list maximum")
+        HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "can't get SOHM list maximum")
     if(H5P_get(fc_plist, H5F_CRT_SHMSG_BTREE_MIN_NAME, &btree_min)<0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get SOHM btree minimum")
+        HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "can't get SOHM btree minimum")
     if(H5P_get(fc_plist, H5F_CRT_SHMSG_INDEX_MINSIZE_NAME, &minsizes) < 0)
-        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get SOHM message min sizes")
+        HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "can't get SOHM message min sizes")
 
     /* Verify that values are valid */
     if(num_indexes > H5O_SHMESG_MAX_NINDEXES)
-        HGOTO_ERROR(H5E_PLIST, H5E_BADRANGE, FAIL, "number of indexes in property list is too large")
+        HGOTO_ERROR(H5E_SOHM, H5E_BADRANGE, FAIL, "number of indexes in property list is too large")
 
     /* Check that type flags weren't duplicated anywhere */
     type_flags_used = 0;
     for(x = 0; x < num_indexes; ++x) {
         if(index_type_flags[x] & type_flags_used)
-            HGOTO_ERROR(H5E_PLIST, H5E_BADVALUE, FAIL, "the same shared message type flag is assigned to more than one index")
+            HGOTO_ERROR(H5E_SOHM, H5E_BADVALUE, FAIL, "the same shared message type flag is assigned to more than one index")
         type_flags_used |= index_type_flags[x];
     } /* end for */
 
     /* Initialize master table */
     if(NULL == (table = H5FL_MALLOC(H5SM_master_table_t)))
-	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for SOHM table")
+	HGOTO_ERROR(H5E_SOHM, H5E_NOSPACE, FAIL, "memory allocation failed for SOHM table")
 
     /* Set version and number of indexes in table and in superblock.
      * Right now we just use one byte to hold the number of indexes.
@@ -183,7 +183,7 @@ H5SM_init(H5F_t *f, H5P_genplist_t * fc_plist, const H5O_loc_t *ext_loc, hid_t d
 
     /* Allocate the SOHM indexes as an array. */
     if(NULL == (table->indexes = (H5SM_index_header_t *)H5FL_ARR_MALLOC(H5SM_index_header_t, (size_t)table->num_indexes)))
-	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for SOHM indexes")
+	HGOTO_ERROR(H5E_SOHM, H5E_NOSPACE, FAIL, "memory allocation failed for SOHM indexes")
 
     /* Initialize all of the indexes, but don't allocate space for them to
      * hold messages until we actually need to write to them.
@@ -206,13 +206,13 @@ H5SM_init(H5F_t *f, H5P_genplist_t * fc_plist, const H5O_loc_t *ext_loc, hid_t d
     } /* end for */
 
     /* Allocate space for the table on disk */
-    table_size = (hsize_t) H5SM_TABLE_SIZE(f) + (hsize_t) (table->num_indexes * H5SM_INDEX_HEADER_SIZE(f));
+    table_size = H5SM_TABLE_SIZE(f) + (table->num_indexes * H5SM_INDEX_HEADER_SIZE(f));
     if(HADDR_UNDEF == (table_addr = H5MF_alloc(f, H5FD_MEM_SOHM_TABLE, dxpl_id, table_size)))
-	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "file allocation failed for SOHM table")
+	HGOTO_ERROR(H5E_SOHM, H5E_NOSPACE, FAIL, "file allocation failed for SOHM table")
 
     /* Cache the new table */
     if(H5AC_set(f, dxpl_id, H5AC_SOHM_TABLE, table_addr, table, H5AC__NO_FLAGS_SET) < 0)
-	HGOTO_ERROR(H5E_CACHE, H5E_CANTINS, FAIL, "can't add SOHM table to cache")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTINS, FAIL, "can't add SOHM table to cache")
 
     /* Record the address of the master table in the file */
     f->shared->sohm_addr = table_addr;
@@ -276,7 +276,7 @@ H5SM_type_to_flag(unsigned type_id, unsigned *type_flag)
             break;
 
         default:
-            HGOTO_ERROR(H5E_OHDR, H5E_BADTYPE, FAIL, "unknown message type ID")
+            HGOTO_ERROR(H5E_SOHM, H5E_BADTYPE, FAIL, "unknown message type ID")
     } /* end switch */
 
 done:
@@ -311,7 +311,7 @@ H5SM_get_index(const H5SM_master_table_t *table, unsigned type_id)
 
     /* Translate the H5O type_id into an H5SM type flag */
     if(H5SM_type_to_flag(type_id, &type_flag) < 0)
-        HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't map message type to flag")
+        HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "can't map message type to flag")
 
     /* Search the indexes until we find one that matches this flag or we've
      * searched them all.
@@ -352,12 +352,12 @@ H5SM_type_shared(H5F_t *f, unsigned type_id, hid_t dxpl_id)
 
     /* Translate the H5O type_id into an H5SM type flag */
     if(H5SM_type_to_flag(type_id, &type_flag) < 0)
-        HGOTO_ERROR(H5E_OHDR, H5E_CANTGET, FAIL, "can't map message type to flag")
+        HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "can't map message type to flag")
 
     /* Look up the master SOHM table */
     if(H5F_addr_defined(f->shared->sohm_addr)) {
         if(NULL == (table = (H5SM_master_table_t *)H5AC_protect(f, dxpl_id, H5AC_SOHM_TABLE, f->shared->sohm_addr, NULL, NULL, H5AC_READ)))
-            HGOTO_ERROR(H5E_OHDR, H5E_CANTPROTECT, FAIL, "unable to load SOHM master table")
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTPROTECT, FAIL, "unable to load SOHM master table")
     } /* end if */
     else
         /* No shared messages of any type */
@@ -373,7 +373,7 @@ H5SM_type_shared(H5F_t *f, unsigned type_id, hid_t dxpl_id)
 done:
     /* Release the master SOHM table */
     if(table && H5AC_unprotect(f, dxpl_id, H5AC_SOHM_TABLE, f->shared->sohm_addr, table, H5AC__NO_FLAGS_SET) < 0)
-	HDONE_ERROR(H5E_OHDR, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM master table")
+	HDONE_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM master table")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5SM_type_shared() */
@@ -407,7 +407,7 @@ H5SM_get_fheap_addr(H5F_t *f, hid_t dxpl_id, unsigned type_id, haddr_t *fheap_ad
 
     /* Look up the master SOHM table */
     if(NULL == (table = (H5SM_master_table_t *)H5AC_protect(f, dxpl_id, H5AC_SOHM_TABLE, f->shared->sohm_addr, NULL, NULL, H5AC_READ)))
-	HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, FAIL, "unable to load SOHM master table")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTPROTECT, FAIL, "unable to load SOHM master table")
 
     /* Look up index for message type */
     if((index_num = H5SM_get_index(table, type_id)) < 0)
@@ -419,7 +419,7 @@ H5SM_get_fheap_addr(H5F_t *f, hid_t dxpl_id, unsigned type_id, haddr_t *fheap_ad
 done:
     /* Release the master SOHM table */
     if(table && H5AC_unprotect(f, dxpl_id, H5AC_SOHM_TABLE, f->shared->sohm_addr, table, H5AC__NO_FLAGS_SET) < 0)
-	HDONE_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM master table")
+	HDONE_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM master table")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5SM_get_fheap_addr() */
@@ -440,41 +440,50 @@ done:
 static herr_t
 H5SM_create_index(H5F_t *f, H5SM_index_header_t *header, hid_t dxpl_id)
 {
-    haddr_t list_addr=HADDR_UNDEF;   /* Address of SOHM list */
-    haddr_t tree_addr=HADDR_UNDEF;   /* Address of SOHM B-tree */
-    H5HF_create_t fheap_cparam;      /* Fractal heap creation parameters */
-    H5HF_t *fheap = NULL;
+    H5HF_create_t fheap_cparam;         /* Fractal heap creation parameters */
+    H5HF_t *fheap = NULL;               /* Fractal heap handle */
+    H5B2_t *bt2 = NULL;                 /* v2 B-tree handle for index */
     herr_t ret_value = SUCCEED;
 
     FUNC_ENTER_NOAPI_NOINIT(H5SM_create_index)
 
+    /* Sanity check */
     HDassert(header);
     HDassert(header->index_addr == HADDR_UNDEF);
     HDassert(header->btree_min <= header->list_max + 1);
 
     /* In most cases, the index starts as a list */
     if(header->list_max > 0) {
-        header->index_type = H5SM_LIST;
+        haddr_t list_addr = HADDR_UNDEF;    /* Address of SOHM list */
 
+        /* Create the list index */
         if((list_addr = H5SM_create_list(f, header, dxpl_id)) == HADDR_UNDEF)
             HGOTO_ERROR(H5E_SOHM, H5E_CANTCREATE, FAIL, "list creation failed for SOHM index")
 
+        /* Set the index type & address */
+        header->index_type = H5SM_LIST;
         header->index_addr = list_addr;
     } /* end if */
     /* index is a B-tree */
     else {
         H5B2_create_t bt2_cparam;           /* v2 B-tree creation parameters */
+        haddr_t tree_addr = HADDR_UNDEF;    /* Address of SOHM B-tree */
 
-        header->index_type = H5SM_BTREE;
-
+        /* Create the v2 B-tree index */
         bt2_cparam.cls = H5SM_INDEX;
         bt2_cparam.node_size = (size_t)H5SM_B2_NODE_SIZE;
         bt2_cparam.rrec_size = (size_t)H5SM_SOHM_ENTRY_SIZE(f);
         bt2_cparam.split_percent = H5SM_B2_SPLIT_PERCENT;
         bt2_cparam.merge_percent = H5SM_B2_MERGE_PERCENT;
-        if(H5B2_create(f, dxpl_id, &bt2_cparam, &tree_addr) < 0)
-            HGOTO_ERROR(H5E_BTREE, H5E_CANTCREATE, FAIL, "B-tree creation failed for SOHM index")
+        if(NULL == (bt2 = H5B2_create_2(f, dxpl_id, &bt2_cparam)))
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTCREATE, FAIL, "B-tree creation failed for SOHM index")
+
+        /* Retrieve the v2 B-tree's address in the file */
+        if(H5B2_get_addr(bt2, &tree_addr) < 0)
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "can't get v2 B-tree address for SOHM index")
 
+        /* Set the index type & address */
+        header->index_type = H5SM_BTREE;
         header->index_addr = tree_addr;
     } /* end else */
 
@@ -489,10 +498,10 @@ H5SM_create_index(H5F_t *f, H5SM_index_header_t *header, hid_t dxpl_id)
     fheap_cparam.id_len = 0;
     fheap_cparam.max_man_size = H5O_FHEAP_MAX_MAN_SIZE;
     if(NULL == (fheap = H5HF_create(f, dxpl_id, &fheap_cparam)))
-        HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, FAIL, "unable to create fractal heap")
+        HGOTO_ERROR(H5E_SOHM, H5E_CANTINIT, FAIL, "unable to create fractal heap")
 
     if(H5HF_get_heap_addr(fheap, &(header->heap_addr)) < 0)
-        HGOTO_ERROR(H5E_HEAP, H5E_CANTGETSIZE, FAIL, "can't get fractal heap address")
+        HGOTO_ERROR(H5E_SOHM, H5E_CANTGETSIZE, FAIL, "can't get fractal heap address")
 
 #ifndef NDEBUG
 {
@@ -500,15 +509,17 @@ H5SM_create_index(H5F_t *f, H5SM_index_header_t *header, hid_t dxpl_id)
 
     /* Sanity check ID length */
     if(H5HF_get_id_len(fheap, &fheap_id_len) < 0)
-        HGOTO_ERROR(H5E_HEAP, H5E_CANTGETSIZE, FAIL, "can't get fractal heap ID length")
+        HGOTO_ERROR(H5E_SOHM, H5E_CANTGETSIZE, FAIL, "can't get fractal heap ID length")
     HDassert(fheap_id_len == H5O_FHEAP_ID_LEN);
 }
 #endif /* NDEBUG */
 
 done:
-    /* Close the fractal heap if one has been created */
+    /* Release resources */
     if(fheap && H5HF_close(fheap, dxpl_id) < 0)
-        HDONE_ERROR(H5E_HEAP, H5E_CLOSEERROR, FAIL, "can't close fractal heap")
+        HDONE_ERROR(H5E_SOHM, H5E_CANTCLOSEOBJ, FAIL, "can't close fractal heap")
+    if(bt2 && H5B2_close(bt2, dxpl_id) < 0)
+        HDONE_ERROR(H5E_SOHM, H5E_CANTCLOSEOBJ, FAIL, "can't close v2 B-tree for SOHM index")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5SM_create_index */
@@ -547,7 +558,7 @@ H5SM_delete_index(H5F_t *f, H5SM_index_header_t *header, hid_t dxpl_id,
 
         /* Check the index list's status in the metadata cache */
         if(H5AC_get_entry_status(f, header->index_addr, &index_status) < 0)
-            HGOTO_ERROR(H5E_HEAP, H5E_CANTGET, FAIL, "unable to check metadata cache status for direct block")
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "unable to check metadata cache status for direct block")
 
         /* If the index list is in the cache, expunge it now */
         if(index_status & H5AC_ES__IN_CACHE) {
@@ -557,15 +568,15 @@ H5SM_delete_index(H5F_t *f, H5SM_index_header_t *header, hid_t dxpl_id,
 
             /* Evict the index list from the metadata cache */
             if(H5AC_expunge_entry(f, dxpl_id, H5AC_SOHM_LIST, header->index_addr, H5AC__FREE_FILE_SPACE_FLAG) < 0)
-                HGOTO_ERROR(H5E_HEAP, H5E_CANTREMOVE, FAIL, "unable to remove list index from cache")
+                HGOTO_ERROR(H5E_SOHM, H5E_CANTREMOVE, FAIL, "unable to remove list index from cache")
         } /* end if */
     } /* end if */
     else {
         HDassert(header->index_type == H5SM_BTREE);
 
-        /* Delete from the B-tree. */
+        /* Delete the B-tree. */
         if(H5B2_delete(f, dxpl_id, header->index_addr, NULL, NULL) < 0)
-            HGOTO_ERROR(H5E_BTREE, H5E_CANTDELETE, FAIL, "unable to delete B-tree")
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTDELETE, FAIL, "unable to delete B-tree")
 
         /* Revert to list unless B-trees can have zero records */
         if(header->btree_min > 0)
@@ -622,9 +633,9 @@ H5SM_create_list(H5F_t *f, H5SM_index_header_t *header, hid_t dxpl_id)
 
     /* Allocate list in memory */
     if((list = H5FL_MALLOC(H5SM_list_t)) == NULL)
-	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, HADDR_UNDEF, "file allocation failed for SOHM list")
+	HGOTO_ERROR(H5E_SOHM, H5E_NOSPACE, HADDR_UNDEF, "file allocation failed for SOHM list")
     if((list->messages = (H5SM_sohm_t *)H5FL_ARR_MALLOC(H5SM_sohm_t, num_entries)) == NULL)
-	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, HADDR_UNDEF, "file allocation failed for SOHM list")
+	HGOTO_ERROR(H5E_SOHM, H5E_NOSPACE, HADDR_UNDEF, "file allocation failed for SOHM list")
 
     /* Initialize messages in list */
     HDmemset(list->messages, 0, sizeof(H5SM_sohm_t) * num_entries);
@@ -637,11 +648,11 @@ H5SM_create_list(H5F_t *f, H5SM_index_header_t *header, hid_t dxpl_id)
     /* Allocate space for the list on disk */
     size = H5SM_LIST_SIZE(f, num_entries);
     if(HADDR_UNDEF == (addr = H5MF_alloc(f, H5FD_MEM_SOHM_INDEX, dxpl_id, size)))
-	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, HADDR_UNDEF, "file allocation failed for SOHM list")
+	HGOTO_ERROR(H5E_SOHM, H5E_NOSPACE, HADDR_UNDEF, "file allocation failed for SOHM list")
 
     /* Put the list into the cache */
     if(H5AC_set(f, dxpl_id, H5AC_SOHM_LIST, addr, list, H5AC__NO_FLAGS_SET) < 0)
-	HGOTO_ERROR(H5E_CACHE, H5E_CANTINS, HADDR_UNDEF, "can't add SOHM list to cache")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTINS, HADDR_UNDEF, "can't add SOHM list to cache")
 
     /* Set return value */
     ret_value = addr;
@@ -689,11 +700,12 @@ H5SM_convert_list_to_btree(H5F_t *f, H5SM_index_header_t *header,
     H5SM_list_t *list;                  /* Pointer to the existing message list */
     H5SM_mesg_key_t key;                /* Key for inserting records in v2 B-tree */
     H5B2_create_t bt2_cparam;           /* v2 B-tree creation parameters */
+    H5B2_t *bt2 = NULL;                 /* v2 B-tree handle for index */
     haddr_t     tree_addr;              /* New v2 B-tree's address */
     size_t      num_messages;		/* Number of messages being tracked */
     size_t      x;
     void *      encoding_buf = NULL;
-    herr_t      ret_value = SUCCEED;
+    herr_t      ret_value = SUCCEED;    /* Return value */
 
     FUNC_ENTER_NOAPI_NOINIT(H5SM_convert_list_to_btree)
 
@@ -709,8 +721,12 @@ H5SM_convert_list_to_btree(H5F_t *f, H5SM_index_header_t *header,
     bt2_cparam.rrec_size = (size_t)H5SM_SOHM_ENTRY_SIZE(f);
     bt2_cparam.split_percent = H5SM_B2_SPLIT_PERCENT;
     bt2_cparam.merge_percent = H5SM_B2_MERGE_PERCENT;
-    if(H5B2_create(f, dxpl_id, &bt2_cparam, &tree_addr) < 0)
-        HGOTO_ERROR(H5E_BTREE, H5E_CANTCREATE, FAIL, "B-tree creation failed for SOHM index")
+    if(NULL == (bt2 = H5B2_create_2(f, dxpl_id, &bt2_cparam)))
+        HGOTO_ERROR(H5E_SOHM, H5E_CANTCREATE, FAIL, "B-tree creation failed for SOHM index")
+
+    /* Retrieve the v2 B-tree's address in the file */
+    if(H5B2_get_addr(bt2, &tree_addr) < 0)
+        HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "can't get v2 B-tree address for SOHM index")
 
     /* Set up key values that all messages will use.  Since these messages
      * are in the heap, they have a heap ID and no encoding or type_id.
@@ -734,8 +750,8 @@ H5SM_convert_list_to_btree(H5F_t *f, H5SM_index_header_t *header,
             key.encoding = encoding_buf;
 
             /* Insert the message into the B-tree */
-            if(H5B2_insert(f, dxpl_id, H5SM_INDEX, tree_addr, &key) < 0)
-                HGOTO_ERROR(H5E_BTREE, H5E_CANTINSERT, FAIL, "couldn't add SOHM to B-tree")
+            if(H5B2_insert_2(bt2, dxpl_id, &key) < 0)
+                HGOTO_ERROR(H5E_SOHM, H5E_CANTINSERT, FAIL, "couldn't add SOHM to B-tree")
 
             /* Free buffer from H5SM_read_mesg */
             if(encoding_buf)
@@ -745,7 +761,7 @@ H5SM_convert_list_to_btree(H5F_t *f, H5SM_index_header_t *header,
 
     /* Unprotect list in cache and release heap */
     if(H5AC_unprotect(f, dxpl_id, H5AC_SOHM_LIST, header->index_addr, list, H5AC__DELETED_FLAG | H5AC__FREE_FILE_SPACE_FLAG) < 0)
-	HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "unable to release SOHM list")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to release SOHM list")
     *_list = list = NULL;
 
     /* Delete the old list index (but not its heap, which the new index is
@@ -761,7 +777,9 @@ H5SM_convert_list_to_btree(H5F_t *f, H5SM_index_header_t *header,
     header->num_messages = num_messages;
 
 done:
-    /* Free the buffer, if it hasn't already been freed (because of error) */
+    /* Release resources */
+    if(bt2 && H5B2_close(bt2, dxpl_id) < 0)
+        HDONE_ERROR(H5E_SOHM, H5E_CANTCLOSEOBJ, FAIL, "can't close v2 B-tree for SOHM index")
     if(encoding_buf)
         encoding_buf = H5MM_xfree(encoding_buf);
 
@@ -811,12 +829,12 @@ H5SM_convert_btree_to_list(H5F_t * f, H5SM_index_header_t * header, hid_t dxpl_i
      * list as they're deleted
      */
     if(H5B2_delete(f, dxpl_id, btree_addr, H5SM_btree_convert_to_list_op, list) < 0)
-        HGOTO_ERROR(H5E_BTREE, H5E_CANTDELETE, FAIL, "unable to delete B-tree")
+        HGOTO_ERROR(H5E_SOHM, H5E_CANTDELETE, FAIL, "unable to delete B-tree")
 
 done:
     /* Release the SOHM list from the cache */
     if(list && H5AC_unprotect(f, dxpl_id, H5AC_SOHM_LIST, header->index_addr, list, H5AC__DIRTIED_FLAG) < 0)
-        HDONE_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "unable to unprotect SOHM index")
+        HDONE_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to unprotect SOHM index")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5SM_convert_btree_to_list() */
@@ -921,7 +939,7 @@ H5SM_can_share(H5F_t *f, hid_t dxpl_id, H5SM_master_table_t *table,
 
     /* If the message isn't big enough, don't bother sharing it */
     if(0 == (mesg_size = H5O_msg_raw_size(f, type_id, TRUE, mesg)))
-        HGOTO_ERROR(H5E_OHDR, H5E_BADMESG, FAIL, "unable to get OH message size")
+        HGOTO_ERROR(H5E_SOHM, H5E_BADMESG, FAIL, "unable to get OH message size")
     if(mesg_size < my_table->indexes[index_num].min_mesg_size)
         HGOTO_DONE(FALSE)
 
@@ -932,7 +950,7 @@ H5SM_can_share(H5F_t *f, hid_t dxpl_id, H5SM_master_table_t *table,
 done:
     /* Release the master SOHM table, if we protected it */
     if(my_table && my_table != table && H5AC_unprotect(f, dxpl_id, H5AC_SOHM_TABLE, f->shared->sohm_addr, my_table, H5AC__NO_FLAGS_SET) < 0)
-	HDONE_ERROR(H5E_SOHM, H5E_CANTRELEASE, FAIL, "unable to close SOHM master table")
+	HDONE_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM master table")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5SM_can_share() */
@@ -1014,7 +1032,7 @@ H5SM_try_share(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh, unsigned type_id,
 
     /* Look up the master SOHM table */
     if(NULL == (table = (H5SM_master_table_t *)H5AC_protect(f, dxpl_id, H5AC_SOHM_TABLE, f->shared->sohm_addr, NULL, NULL, H5AC_WRITE)))
-	HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, FAIL, "unable to load SOHM master table")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTPROTECT, FAIL, "unable to load SOHM master table")
 
     /* "complex" sharing checks */
     if((tri_ret = H5SM_can_share(f, dxpl_id, table, &index_num, type_id, mesg)) < 0)
@@ -1051,7 +1069,7 @@ H5SM_try_share(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh, unsigned type_id,
 done:
     /* Release the master SOHM table */
     if(table && H5AC_unprotect(f, dxpl_id, H5AC_SOHM_TABLE, f->shared->sohm_addr, table, cache_flags) < 0)
-	HDONE_ERROR(H5E_CACHE, H5E_CANTRELEASE, FAIL, "unable to close SOHM master table")
+	HDONE_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM master table")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5SM_try_share() */
@@ -1095,7 +1113,7 @@ H5SM_incr_ref(void *record, void *_op_data, hbool_t *changed)
 
         /* Put the message in the heap and record its new heap ID */
         if(H5HF_insert(op_data->key->fheap, op_data->dxpl_id, op_data->key->encoding_size, op_data->key->encoding, &message->u.heap_loc.fheap_id) < 0)
-            HGOTO_ERROR(H5E_HEAP, H5E_CANTINSERT, FAIL, "unable to insert message into fractal heap")
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTINSERT, FAIL, "unable to insert message into fractal heap")
 
         message->location = H5SM_IN_HEAP;
         message->u.heap_loc.ref_count = 2;
@@ -1151,6 +1169,7 @@ H5SM_write_mesg(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
     H5O_shared_t          shared;           /* Shared H5O message */
     hbool_t               found = FALSE;    /* Was the message in the index? */
     H5HF_t                *fheap = NULL;    /* Fractal heap handle */
+    H5B2_t                *bt2 = NULL;      /* v2 B-tree handle for index */
     size_t                buf_size;         /* Size of the encoded message */
     void *                encoding_buf = NULL; /* Buffer for encoded message */
     size_t                empty_pos = UFAIL; /* Empty entry in list */
@@ -1165,15 +1184,15 @@ H5SM_write_mesg(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
 
     /* Encode the message to be written */
     if((buf_size = H5O_msg_raw_size(f, type_id, TRUE, mesg)) == 0)
-	HGOTO_ERROR(H5E_OHDR, H5E_BADSIZE, FAIL, "can't find message size")
+	HGOTO_ERROR(H5E_SOHM, H5E_BADSIZE, FAIL, "can't find message size")
     if(NULL == (encoding_buf = H5MM_malloc(buf_size)))
-	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't allocate buffer for encoding")
+	HGOTO_ERROR(H5E_SOHM, H5E_NOSPACE, FAIL, "can't allocate buffer for encoding")
     if(H5O_msg_encode(f, type_id, TRUE, (unsigned char *)encoding_buf, mesg) < 0)
-	HGOTO_ERROR(H5E_OHDR, H5E_CANTENCODE, FAIL, "can't encode message to be shared")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTENCODE, FAIL, "can't encode message to be shared")
 
     /* Open the fractal heap for this index */
     if(NULL == (fheap = H5HF_open(f, dxpl_id, header->heap_addr)))
-	HGOTO_ERROR(H5E_HEAP, H5E_CANTOPENOBJ, FAIL, "unable to open fractal heap")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTOPENOBJ, FAIL, "unable to open fractal heap")
 
     /* Set up a key for the message to be written */
     key.dxpl_id = dxpl_id;
@@ -1193,7 +1212,7 @@ H5SM_write_mesg(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
 
         /* The index is a list; get it from the cache */
         if(NULL == (list = (H5SM_list_t *)H5AC_protect(f, dxpl_id, H5AC_SOHM_LIST, header->index_addr, NULL, header, H5AC_WRITE)))
-	    HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, FAIL, "unable to load SOHM index")
+	    HGOTO_ERROR(H5E_SOHM, H5E_CANTPROTECT, FAIL, "unable to load SOHM index")
 
         /* See if the message is already in the index and get its location.
          * Also record the first empty list position we find in case we need it
@@ -1207,7 +1226,7 @@ H5SM_write_mesg(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
             if(list->messages[list_pos].location == H5SM_IN_OH) {
                 /* Put the message in the heap and record its new heap ID */
                 if(H5HF_insert(fheap, dxpl_id, key.encoding_size, key.encoding, &shared.u.heap_id) < 0)
-                    HGOTO_ERROR(H5E_HEAP, H5E_CANTINSERT, FAIL, "unable to insert message into fractal heap")
+                    HGOTO_ERROR(H5E_SOHM, H5E_CANTINSERT, FAIL, "unable to insert message into fractal heap")
 
                 list->messages[list_pos].location = H5SM_IN_HEAP;
                 list->messages[list_pos].u.heap_loc.fheap_id = shared.u.heap_id;
@@ -1230,6 +1249,11 @@ H5SM_write_mesg(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
 
         HDassert(header->index_type == H5SM_BTREE);
 
+        /* Open the index v2 B-tree */
+        if(NULL == (bt2 = H5B2_open(f, dxpl_id, header->index_addr)))
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTOPENOBJ, FAIL, "unable to open v2 B-tree for SOHM index")
+
+        /* Set up callback info */
         op_data.key = &key;
         op_data.dxpl_id = dxpl_id;
 
@@ -1238,10 +1262,12 @@ H5SM_write_mesg(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
          * return a heap ID, since a message with a reference count greater
          * than 1 is always shared in the heap.
          */
-        if(H5B2_modify(f, dxpl_id, H5SM_INDEX, header->index_addr, &key, H5SM_incr_ref, &op_data) >= 0) {
+        if(H5B2_modify_2(bt2, dxpl_id, &key, H5SM_incr_ref, &op_data) >= 0) {
             shared.u.heap_id = op_data.fheap_id;
             found = TRUE;
         } /* end if */
+        else
+            H5E_clear_stack(NULL); /*ignore error*/
     } /* end else */
 
     if(found)
@@ -1316,8 +1342,14 @@ H5SM_write_mesg(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
         else {
             HDassert(header->index_type == H5SM_BTREE);
 
-            if(H5B2_insert(f, dxpl_id, H5SM_INDEX, header->index_addr, &key) < 0)
-                HGOTO_ERROR(H5E_BTREE, H5E_CANTINSERT, FAIL, "couldn't add SOHM to B-tree")
+            /* Open the index v2 B-tree, if it isn't already */
+            if(NULL == bt2) {
+                if(NULL == (bt2 = H5B2_open(f, dxpl_id, header->index_addr)))
+                    HGOTO_ERROR(H5E_SOHM, H5E_CANTOPENOBJ, FAIL, "unable to open v2 B-tree for SOHM index")
+            } /* end if */
+
+            if(H5B2_insert_2(bt2, dxpl_id, &key) < 0)
+                HGOTO_ERROR(H5E_SOHM, H5E_CANTINSERT, FAIL, "couldn't add SOHM to B-tree")
         } /* end else */
 
         ++(header->num_messages);
@@ -1330,16 +1362,18 @@ H5SM_write_mesg(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
 
     /* Update the original message's shared component */
     if(H5O_msg_set_share(type_id, &shared, mesg) < 0)
-        HGOTO_ERROR(H5E_OHDR, H5E_BADMESG, FAIL, "unable to set sharing information")
+        HGOTO_ERROR(H5E_SOHM, H5E_BADMESG, FAIL, "unable to set sharing information")
 
 done:
-    /* Release the fractal heap if we opened it */
+    /* Release the fractal heap & v2 B-tree if we opened them */
     if(fheap && H5HF_close(fheap, dxpl_id) < 0)
-        HDONE_ERROR(H5E_HEAP, H5E_CLOSEERROR, FAIL, "can't close fractal heap")
+        HDONE_ERROR(H5E_SOHM, H5E_CANTCLOSEOBJ, FAIL, "can't close fractal heap")
+    if(bt2 && H5B2_close(bt2, dxpl_id) < 0)
+        HDONE_ERROR(H5E_SOHM, H5E_CANTCLOSEOBJ, FAIL, "can't close v2 B-tree for SOHM index")
 
     /* If we got a list out of the cache, release it (it is always dirty after writing a message) */
     if(list && H5AC_unprotect(f, dxpl_id, H5AC_SOHM_LIST, header->index_addr, list, H5AC__DIRTIED_FLAG) < 0)
-	HDONE_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM index")
+	HDONE_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM index")
 
     if(encoding_buf)
         encoding_buf = H5MM_xfree(encoding_buf);
@@ -1388,7 +1422,7 @@ H5SM_delete(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh, H5O_shared_t *sh_mesg)
 
     /* Look up the master SOHM table */
     if(NULL == (table = (H5SM_master_table_t *)H5AC_protect(f, dxpl_id, H5AC_SOHM_TABLE, f->shared->sohm_addr, NULL, NULL, H5AC_WRITE)))
-	HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, FAIL, "unable to load SOHM master table")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTPROTECT, FAIL, "unable to load SOHM master table")
 
     /* Find the correct index and try to delete from it */
     if((index_num = H5SM_get_index(table, type_id)) < 0)
@@ -1403,7 +1437,7 @@ H5SM_delete(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh, H5O_shared_t *sh_mesg)
 
     /* Release the master SOHM table */
     if(H5AC_unprotect(f, dxpl_id, H5AC_SOHM_TABLE, f->shared->sohm_addr, table, cache_flags) < 0)
-	HGOTO_ERROR(H5E_CACHE, H5E_CANTRELEASE, FAIL, "unable to close SOHM master table")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM master table")
     table = NULL;
 
     /* If buf was allocated, delete the message it holds.  This message may
@@ -1412,16 +1446,16 @@ H5SM_delete(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh, H5O_shared_t *sh_mesg)
      */
     if(mesg_buf) {
         if(NULL == (native_mesg = H5O_msg_decode(f, dxpl_id, open_oh, type_id, (const unsigned char *)mesg_buf)))
-            HGOTO_ERROR(H5E_OHDR, H5E_CANTDECODE, FAIL, "can't decode shared message.")
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTDECODE, FAIL, "can't decode shared message.")
 
         if(H5O_msg_delete(f, dxpl_id, open_oh, type_id, native_mesg) < 0)
-            HGOTO_ERROR(H5E_OHDR, H5E_CANTFREE, FAIL, "can't delete shared message.")
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTFREE, FAIL, "can't delete shared message.")
     } /* end if */
 
 done:
     /* Release the master SOHM table (should only happen on error) */
     if(table && H5AC_unprotect(f, dxpl_id, H5AC_SOHM_TABLE, f->shared->sohm_addr, table, cache_flags) < 0)
-	HDONE_ERROR(H5E_CACHE, H5E_CANTRELEASE, FAIL, "unable to close SOHM master table")
+	HDONE_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM master table")
 
     /* Release any native message we decoded */
     if(native_mesg)
@@ -1597,6 +1631,7 @@ H5SM_delete_from_index(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
     H5SM_sohm_t     message;            /* Deleted message returned from index */
     H5SM_sohm_t    *message_ptr;        /* Pointer to deleted message returned from index */
     H5HF_t         *fheap = NULL;       /* Fractal heap that contains the message */
+    H5B2_t         *bt2 = NULL;         /* v2 B-tree handle for index */
     size_t          buf_size;           /* Size of the encoded message (out) */
     void            *encoding_buf = NULL; /* The encoded message (out) */
     unsigned        type_id;            /* Message type to operate on */
@@ -1616,7 +1651,7 @@ H5SM_delete_from_index(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
 
     /* Open the heap for this type of message. */
     if(NULL == (fheap = H5HF_open(f, dxpl_id, header->heap_addr)))
-	HGOTO_ERROR(H5E_HEAP, H5E_CANTOPENOBJ, FAIL, "unable to open fractal heap")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTOPENOBJ, FAIL, "unable to open fractal heap")
 
     /* Get the message size and encoded message for the message to be deleted,
      * either from its OH or from the heap.
@@ -1635,7 +1670,7 @@ H5SM_delete_from_index(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
 
     /* Get the encoded message */
     if(H5SM_read_mesg(f, &key.message, fheap, open_oh, dxpl_id, &buf_size, &encoding_buf) < 0)
-	HGOTO_ERROR(H5E_HEAP, H5E_CANTOPENOBJ, FAIL, "unable to open fractal heap")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTOPENOBJ, FAIL, "unable to open fractal heap")
 
     /* Set up key for message to be deleted. */
     key.file = f;
@@ -1667,9 +1702,14 @@ H5SM_delete_from_index(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
         /* Index is a B-tree */
         HDassert(header->index_type == H5SM_BTREE);
 
+        /* Open the index v2 B-tree */
+        if(NULL == (bt2 = H5B2_open(f, dxpl_id, header->index_addr)))
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTOPENOBJ, FAIL, "unable to open v2 B-tree for SOHM index")
+
         /* If this returns failure, it means that the message wasn't found.
-         * If it succeeds, a copy of the modified message will be returned. */
-        if(H5B2_modify(f, dxpl_id, H5SM_INDEX, header->index_addr, &key, H5SM_decr_ref, &message) <0)
+         * If it succeeds, a copy of the modified message will be returned.
+         */
+        if(H5B2_modify_2(bt2, dxpl_id, &key, H5SM_decr_ref, &message) <0)
 	    HGOTO_ERROR(H5E_SOHM, H5E_NOTFOUND, FAIL, "message not in index")
 
         /* Point to the message */
@@ -1691,8 +1731,14 @@ H5SM_delete_from_index(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
         if(header->index_type == H5SM_LIST)
             message_ptr->location = H5SM_NO_LOC;
         else {
-            if(H5B2_remove(f, dxpl_id, H5SM_INDEX, header->index_addr, &key, NULL, NULL) < 0)
-                HGOTO_ERROR(H5E_BTREE, H5E_CANTREMOVE, FAIL, "unable to delete message")
+            /* Open the index v2 B-tree, if it isn't already */
+            if(NULL == bt2) {
+                if(NULL == (bt2 = H5B2_open(f, dxpl_id, header->index_addr)))
+                    HGOTO_ERROR(H5E_SOHM, H5E_CANTOPENOBJ, FAIL, "unable to open v2 B-tree for SOHM index")
+            } /* end if */
+
+            if(H5B2_remove_2(bt2, dxpl_id, &key, NULL, NULL) < 0)
+                HGOTO_ERROR(H5E_SOHM, H5E_CANTREMOVE, FAIL, "unable to delete message from index")
         } /* end else */
 
         /* Remove the message from the heap if it was stored in the heap*/
@@ -1709,12 +1755,12 @@ H5SM_delete_from_index(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
 
             /* Unprotect cache and release heap */
             if(list && H5AC_unprotect(f, dxpl_id, H5AC_SOHM_LIST, header->index_addr, list, H5AC__DELETED_FLAG | H5AC__FREE_FILE_SPACE_FLAG) < 0)
-	        HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "unable to release SOHM list")
+	        HGOTO_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to release SOHM list")
             list = NULL;
 
             HDassert(fheap);
             if(H5HF_close(fheap, dxpl_id) < 0)
-                HGOTO_ERROR(H5E_HEAP, H5E_CLOSEERROR, FAIL, "can't close fractal heap")
+                HGOTO_ERROR(H5E_SOHM, H5E_CANTCLOSEOBJ, FAIL, "can't close fractal heap")
             fheap = NULL;
 
             /* Delete the index and its heap */
@@ -1733,11 +1779,13 @@ H5SM_delete_from_index(H5F_t *f, hid_t dxpl_id, H5O_t *open_oh,
 done:
     /* Release the SOHM list */
     if(list && H5AC_unprotect(f, dxpl_id, H5AC_SOHM_LIST, header->index_addr, list, H5AC__DIRTIED_FLAG) < 0)
-	HDONE_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM index")
+	HDONE_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM index")
 
-    /* Release the fractal heap if we opened it */
+    /* Release the fractal heap & v2 B-tree if we opened them */
     if(fheap && H5HF_close(fheap, dxpl_id) < 0)
-        HDONE_ERROR(H5E_HEAP, H5E_CLOSEERROR, FAIL, "can't close fractal heap")
+        HDONE_ERROR(H5E_SOHM, H5E_CANTCLOSEOBJ, FAIL, "can't close fractal heap")
+    if(bt2 && H5B2_close(bt2, dxpl_id) < 0)
+        HDONE_ERROR(H5E_SOHM, H5E_CANTCLOSEOBJ, FAIL, "can't close v2 B-tree for SOHM index")
 
     /* Free the message encoding, if we're not returning it in encoded_mesg
      * or if there's been an error.
@@ -1780,7 +1828,7 @@ H5SM_get_info(const H5O_loc_t *ext_loc, H5P_genplist_t *fc_plist, hid_t dxpl_id)
 
     /* Check for the extension having a 'shared message info' message */
     if((status = H5O_msg_exists(ext_loc, H5O_SHMESG_ID, dxpl_id)) < 0)
-        HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to read object header")
+        HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "unable to read object header")
     if(status) {
         unsigned index_flags[H5O_SHMESG_MAX_NINDEXES];  /* Message flags for each index */
         unsigned minsizes[H5O_SHMESG_MAX_NINDEXES];     /* Minimum message size for each index */
@@ -1790,7 +1838,7 @@ H5SM_get_info(const H5O_loc_t *ext_loc, H5P_genplist_t *fc_plist, hid_t dxpl_id)
 
         /* Retrieve the 'shared message info' structure */
         if(NULL == H5O_msg_read(ext_loc, H5O_SHMESG_ID, &sohm_table, dxpl_id))
-            HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "shared message info message not present")
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "shared message info message not present")
 
         /* Portably initialize the arrays */
         HDmemset(index_flags, 0, sizeof(index_flags));
@@ -1805,7 +1853,7 @@ H5SM_get_info(const H5O_loc_t *ext_loc, H5P_genplist_t *fc_plist, hid_t dxpl_id)
 
         /* Read the rest of the SOHM table information from the cache */
         if(NULL == (table = (H5SM_master_table_t *)H5AC_protect(f, dxpl_id, H5AC_SOHM_TABLE, shared->sohm_addr, NULL, NULL, H5AC_READ)))
-            HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, FAIL, "unable to load SOHM master table")
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTPROTECT, FAIL, "unable to load SOHM master table")
 
         /* Get index conversion limits */
         sohm_l2b = table->indexes[0].list_max;
@@ -1830,15 +1878,15 @@ H5SM_get_info(const H5O_loc_t *ext_loc, H5P_genplist_t *fc_plist, hid_t dxpl_id)
 
         /* Set values in the property list */
         if(H5P_set(fc_plist, H5F_CRT_SHMSG_NINDEXES_NAME, &shared->sohm_nindexes) < 0)
-            HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set number of SOHM indexes")
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTSET, FAIL, "can't set number of SOHM indexes")
         if(H5P_set(fc_plist, H5F_CRT_SHMSG_INDEX_TYPES_NAME, index_flags) < 0)
-            HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set type flags for indexes")
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTSET, FAIL, "can't set type flags for indexes")
         if(H5P_set(fc_plist, H5F_CRT_SHMSG_INDEX_MINSIZE_NAME, minsizes) < 0)
-            HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set type flags for indexes")
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTSET, FAIL, "can't set type flags for indexes")
         if(H5P_set(fc_plist, H5F_CRT_SHMSG_LIST_MAX_NAME, &sohm_l2b) < 0)
-            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't set SOHM cutoff in property list")
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "can't set SOHM cutoff in property list")
         if(H5P_set(fc_plist, H5F_CRT_SHMSG_BTREE_MIN_NAME, &sohm_b2l) < 0)
-            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't set SOHM cutoff in property list")
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "can't set SOHM cutoff in property list")
     } /* end if */
     else {
         /* No SOHM info in file */
@@ -1848,13 +1896,13 @@ H5SM_get_info(const H5O_loc_t *ext_loc, H5P_genplist_t *fc_plist, hid_t dxpl_id)
 
         /* Shared object header messages are disabled */
         if(H5P_set(fc_plist, H5F_CRT_SHMSG_NINDEXES_NAME, &shared->sohm_nindexes) < 0)
-            HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set number of SOHM indexes")
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTSET, FAIL, "can't set number of SOHM indexes")
     } /* end else */
 
 done:
     /* Release the master SOHM table if we took it out of the cache */
     if(table && H5AC_unprotect(f, dxpl_id, H5AC_SOHM_TABLE, shared->sohm_addr, table, H5AC__NO_FLAGS_SET) < 0)
-	HDONE_ERROR(H5E_CACHE, H5E_CANTRELEASE, FAIL, "unable to close SOHM master table")
+	HDONE_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM master table")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5SM_get_info() */
@@ -1891,7 +1939,7 @@ H5SM_message_encode(const H5F_t *f, uint8_t *raw, const void *_nrecord)
         HDassert(message->location == H5SM_IN_OH);
 
         *raw++ = 0;     /* reserved (possible flags byte) */
-        *raw++ = message->msg_type_id;
+        *raw++ = (uint8_t)message->msg_type_id;
         UINT16ENCODE(raw, message->u.mesg_loc.index);
         H5F_addr_encode(f, &raw, message->u.mesg_loc.oh_addr);
     } /* end else */
@@ -2022,6 +2070,7 @@ H5SM_get_refcount(H5F_t *f, hid_t dxpl_id, unsigned type_id,
     const H5O_shared_t *sh_mesg, hsize_t *ref_count)
 {
     H5HF_t *fheap = NULL;               /* Fractal heap that contains shared messages */
+    H5B2_t *bt2 = NULL;                 /* v2 B-tree handle for index */
     H5SM_master_table_t *table = NULL;  /* SOHM master table */
     H5SM_list_t *list = NULL;           /* SOHM index list for message type (if in list form) */
     H5SM_index_header_t *header=NULL;   /* Index header for message type */
@@ -2041,7 +2090,7 @@ H5SM_get_refcount(H5F_t *f, hid_t dxpl_id, unsigned type_id,
 
     /* Look up the master SOHM table */
     if(NULL == (table = (H5SM_master_table_t *)H5AC_protect(f, dxpl_id, H5AC_SOHM_TABLE, f->shared->sohm_addr, NULL, NULL, H5AC_READ)))
-	HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, FAIL, "unable to load SOHM master table")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTPROTECT, FAIL, "unable to load SOHM master table")
 
     /* Find the correct index and find the message in it */
     if((index_num = H5SM_get_index(table, type_id)) < 0)
@@ -2050,7 +2099,7 @@ H5SM_get_refcount(H5F_t *f, hid_t dxpl_id, unsigned type_id,
 
     /* Open the heap for this message type */
     if(NULL == (fheap = H5HF_open(f, dxpl_id, header->heap_addr)))
-	HGOTO_ERROR(H5E_HEAP, H5E_CANTOPENOBJ, FAIL, "unable to open fractal heap")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTOPENOBJ, FAIL, "unable to open fractal heap")
 
     /* Set up a SOHM message to correspond to the shared message passed in */
     key.message.location = H5SM_IN_HEAP;
@@ -2059,7 +2108,7 @@ H5SM_get_refcount(H5F_t *f, hid_t dxpl_id, unsigned type_id,
 
     /* Get the encoded message */
     if(H5SM_read_mesg(f, &key.message, fheap, NULL, dxpl_id, &buf_size, &encoding_buf) < 0)
-	HGOTO_ERROR(H5E_HEAP, H5E_CANTOPENOBJ, FAIL, "unable to open fractal heap")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTOPENOBJ, FAIL, "unable to open fractal heap")
 
     /* Set up key for message to locate */
     key.file = f;
@@ -2090,8 +2139,12 @@ H5SM_get_refcount(H5F_t *f, hid_t dxpl_id, unsigned type_id,
         /* Index is a B-tree */
         HDassert(header->index_type == H5SM_BTREE);
 
+        /* Open the index v2 B-tree */
+        if(NULL == (bt2 = H5B2_open(f, dxpl_id, header->index_addr)))
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTOPENOBJ, FAIL, "unable to open v2 B-tree for SOHM index")
+
         /* Look up the message in the v2 B-tree */
-        if((msg_exists = H5B2_find(f, dxpl_id, H5SM_INDEX, header->index_addr, &key, H5SM_get_refcount_bt2_cb, &message)) < 0)
+        if((msg_exists = H5B2_find_2(bt2, dxpl_id, &key, H5SM_get_refcount_bt2_cb, &message)) < 0)
             HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "error finding message in index")
         if(!msg_exists)
 	    HGOTO_ERROR(H5E_SOHM, H5E_NOTFOUND, FAIL, "message not in index")
@@ -2104,11 +2157,13 @@ H5SM_get_refcount(H5F_t *f, hid_t dxpl_id, unsigned type_id,
 done:
     /* Release resources */
     if(list && H5AC_unprotect(f, dxpl_id, H5AC_SOHM_LIST, header->index_addr, list, H5AC__NO_FLAGS_SET) < 0)
-	HDONE_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM index")
+	HDONE_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM index")
     if(table && H5AC_unprotect(f, dxpl_id, H5AC_SOHM_TABLE, f->shared->sohm_addr, table, H5AC__NO_FLAGS_SET) < 0)
-	HDONE_ERROR(H5E_CACHE, H5E_CANTRELEASE, FAIL, "unable to close SOHM master table")
+	HDONE_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM master table")
     if(fheap && H5HF_close(fheap, dxpl_id) < 0)
-        HDONE_ERROR(H5E_HEAP, H5E_CLOSEERROR, FAIL, "can't close fractal heap")
+        HDONE_ERROR(H5E_SOHM, H5E_CANTCLOSEOBJ, FAIL, "can't close fractal heap")
+    if(bt2 && H5B2_close(bt2, dxpl_id) < 0)
+        HDONE_ERROR(H5E_SOHM, H5E_CANTCLOSEOBJ, FAIL, "can't close v2 B-tree for SOHM index")
     if(encoding_buf)
         encoding_buf = H5MM_xfree(encoding_buf);
 
@@ -2156,7 +2211,7 @@ H5SM_read_iter_op(H5O_t *oh, H5O_mesg_t *mesg/*in,out*/, unsigned sequence,
         /* Check if the message is dirty & flush it to the object header if so */
         if(mesg->dirty)
             if(H5O_msg_flush(udata->file, oh, mesg) < 0)
-                HGOTO_ERROR(H5E_OHDR, H5E_CANTENCODE, H5_ITER_ERROR, "unable to encode object header message")
+                HGOTO_ERROR(H5E_SOHM, H5E_CANTENCODE, H5_ITER_ERROR, "unable to encode object header message")
 
         /* Get the message's encoded size */
         udata->buf_size = mesg->raw_size;
@@ -2164,7 +2219,7 @@ H5SM_read_iter_op(H5O_t *oh, H5O_mesg_t *mesg/*in,out*/, unsigned sequence,
 
         /* Allocate buffer to return the message in */
         if(NULL == (udata->encoding_buf = H5MM_malloc(udata->buf_size)))
-            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, H5_ITER_ERROR, "memory allocation failed")
+            HGOTO_ERROR(H5E_SOHM, H5E_NOSPACE, H5_ITER_ERROR, "memory allocation failed")
 
         /* Copy the encoded message into the buffer to return */
         HDmemcpy(udata->encoding_buf, mesg->raw, udata->buf_size);
@@ -2202,7 +2257,7 @@ H5SM_read_mesg_fh_cb(const void *obj, size_t obj_len, void *_udata)
 
     /* Allocate a buffer to hold the message */
     if(NULL == (udata->encoding_buf = H5MM_malloc(obj_len)))
-        HGOTO_ERROR(H5E_OHDR, H5E_NOSPACE, FAIL, "memory allocation failed")
+        HGOTO_ERROR(H5E_SOHM, H5E_NOSPACE, FAIL, "memory allocation failed")
 
     /* Copy the message from the heap */
     HDmemcpy(udata->encoding_buf, obj, obj_len);
@@ -2261,18 +2316,18 @@ H5SM_read_mesg(H5F_t *f, const H5SM_sohm_t *mesg, H5HF_t *fheap,
 
         /* Reset object location for operation */
         if(H5O_loc_reset(&oloc) < 0)
-            HGOTO_ERROR(H5E_SYM, H5E_CANTRESET, FAIL, "unable to initialize location")
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTRESET, FAIL, "unable to initialize location")
 
         if(NULL == open_oh || mesg->u.mesg_loc.oh_addr != H5O_OH_GET_ADDR(open_oh)) {
             /* Open the object in the file */
             oloc.file = f;
             oloc.addr = mesg->u.mesg_loc.oh_addr;
             if(H5O_open(&oloc) < 0)
-	        HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, FAIL, "unable to open object header")
+	        HGOTO_ERROR(H5E_SOHM, H5E_CANTLOAD, FAIL, "unable to open object header")
 
             /* Load the object header from the cache */
             if(NULL == (oh = (H5O_t *)H5AC_protect(oloc.file, dxpl_id, H5AC_OHDR, oloc.addr, NULL, NULL, H5AC_READ)))
-	        HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, FAIL, "unable to load object header")
+	        HGOTO_ERROR(H5E_SOHM, H5E_CANTLOAD, FAIL, "unable to load object header")
         } /* end if */
         else
             oh = open_oh;
@@ -2281,14 +2336,14 @@ H5SM_read_mesg(H5F_t *f, const H5SM_sohm_t *mesg, H5HF_t *fheap,
         op.op_type = H5O_MESG_OP_LIB;
         op.u.lib_op = H5SM_read_iter_op;
         if((ret_value = H5O_msg_iterate_real(f, oh, type, &op, &udata, dxpl_id)) < 0)
-            HGOTO_ERROR(H5E_OHDR, H5E_BADITER, FAIL, "unable to iterate over object header messages")
+            HGOTO_ERROR(H5E_SOHM, H5E_BADITER, FAIL, "unable to iterate over object header messages")
     } /* end if */
     else {
         HDassert(mesg->location == H5SM_IN_HEAP);
 
         /* Copy the message from the heap */
         if(H5HF_op(fheap, dxpl_id, &(mesg->u.heap_loc.fheap_id), H5SM_read_mesg_fh_cb, &udata) < 0)
-            HGOTO_ERROR(H5E_OHDR, H5E_CANTLOAD, FAIL, "can't read message from fractal heap.")
+            HGOTO_ERROR(H5E_SOHM, H5E_CANTLOAD, FAIL, "can't read message from fractal heap.")
     } /* end else */
     HDassert(udata.encoding_buf);
     HDassert(udata.buf_size);
@@ -2301,10 +2356,9 @@ done:
     /* Close the object header if we opened one and had an error */
     if(oh && oh != open_oh) {
         if(H5AC_unprotect(oloc.file, dxpl_id, H5AC_OHDR, oloc.addr, oh, H5AC__NO_FLAGS_SET) < 0)
-            HDONE_ERROR(H5E_OHDR, H5E_PROTECT, FAIL, "unable to release object header")
-
+            HDONE_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to release object header")
         if(H5O_close(&oloc) < 0)
-            HDONE_ERROR(H5E_OHDR, H5E_CANTRELEASE, FAIL, "unable to close object header")
+            HDONE_ERROR(H5E_SOHM, H5E_CANTCLOSEOBJ, FAIL, "unable to close object header")
     } /* end if */
 
     /* Release the encoding buffer on error */
@@ -2361,13 +2415,13 @@ H5SM_table_debug(H5F_t *f, hid_t dxpl_id, haddr_t table_addr,
 
     /* Check arguments.  Version must be 0, the only version implemented so far */
     if(table_vers > HDF5_SHAREDHEADER_VERSION)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "unknown shared message table version")
+        HGOTO_ERROR(H5E_SOHM, H5E_BADVALUE, FAIL, "unknown shared message table version")
     if(num_indexes == 0 || num_indexes > H5O_SHMESG_MAX_NINDEXES)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "number of indexes must be between 1 and H5O_SHMESG_MAX_NINDEXES")
+        HGOTO_ERROR(H5E_SOHM, H5E_BADVALUE, FAIL, "number of indexes must be between 1 and H5O_SHMESG_MAX_NINDEXES")
 
     /* Look up the master SOHM table */
     if(NULL == (table = (H5SM_master_table_t *)H5AC_protect(f, dxpl_id, H5AC_SOHM_TABLE, table_addr, NULL, NULL, H5AC_READ)))
-	HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, FAIL, "unable to load SOHM master table")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTPROTECT, FAIL, "unable to load SOHM master table")
 
     HDfprintf(stream, "%*sShared Message Master Table...\n", indent, "");
     for(x = 0; x < num_indexes; ++x) {
@@ -2395,7 +2449,7 @@ H5SM_table_debug(H5F_t *f, hid_t dxpl_id, haddr_t table_addr,
 
 done:
     if(table && H5AC_unprotect(f, dxpl_id, H5AC_SOHM_TABLE, table_addr, table, H5AC__NO_FLAGS_SET) < 0)
-	HDONE_ERROR(H5E_CACHE, H5E_CANTRELEASE, FAIL, "unable to close SOHM master table")
+	HDONE_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM master table")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5SM_table_debug() */
@@ -2436,9 +2490,9 @@ H5SM_list_debug(H5F_t *f, hid_t dxpl_id, haddr_t list_addr,
 
     /* Check arguments.  Version must be 0, the only version implemented so far */
     if(table_vers > H5SM_LIST_VERSION)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "unknown shared message list version")
+        HGOTO_ERROR(H5E_SOHM, H5E_BADVALUE, FAIL, "unknown shared message list version")
     if(num_messages == 0 || num_messages > H5O_SHMESG_MAX_LIST_SIZE)
-        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "number of indexes must be between 1 and H5O_SHMESG_MAX_NINDEXES")
+        HGOTO_ERROR(H5E_SOHM, H5E_BADVALUE, FAIL, "number of indexes must be between 1 and H5O_SHMESG_MAX_NINDEXES")
 
     /* Create a temporary header using the arguments.  The cache needs this to load the list. */
     HDmemset(&header, 0, sizeof(H5SM_index_header_t));
@@ -2448,7 +2502,7 @@ H5SM_list_debug(H5F_t *f, hid_t dxpl_id, haddr_t list_addr,
 
     /* Get the list from the cache */
     if(NULL == (list = (H5SM_list_t *)H5AC_protect(f, dxpl_id, H5AC_SOHM_LIST, list_addr, NULL, &header, H5AC_READ)))
-	HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, FAIL, "unable to load SOHM index")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTPROTECT, FAIL, "unable to load SOHM index")
 
     HDfprintf(stream, "%*sShared Message List Index...\n", indent, "");
     for(x = 0; x < num_messages; ++x) {
@@ -2480,7 +2534,7 @@ H5SM_list_debug(H5F_t *f, hid_t dxpl_id, haddr_t list_addr,
 
 done:
     if(list && H5AC_unprotect(f, dxpl_id, H5AC_SOHM_LIST, list_addr, list, H5AC__NO_FLAGS_SET) < 0)
-	HDONE_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM index")
+	HDONE_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM index")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5SM_list_debug() */
@@ -2507,6 +2561,7 @@ H5SM_ih_size(H5F_t *f, hid_t dxpl_id, hsize_t *hdr_size, H5_ih_info_t *ih_info)
 {
     H5SM_master_table_t *table = NULL;          /* SOHM master table */
     H5HF_t              *fheap = NULL;          /* Fractal heap handle */
+    H5B2_t              *bt2 = NULL;            /* v2 B-tree handle for index */
     unsigned    	u;                      /* Local index variable */
     herr_t              ret_value = SUCCEED;    /* Return value */
 
@@ -2520,36 +2575,47 @@ H5SM_ih_size(H5F_t *f, hid_t dxpl_id, hsize_t *hdr_size, H5_ih_info_t *ih_info)
 
     /* Look up the master SOHM table */
     if(NULL == (table = (H5SM_master_table_t *)H5AC_protect(f, dxpl_id, H5AC_SOHM_TABLE, f->shared->sohm_addr, NULL, NULL, H5AC_READ)))
-	HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, FAIL, "unable to load SOHM master table")
+	HGOTO_ERROR(H5E_SOHM, H5E_CANTPROTECT, FAIL, "unable to load SOHM master table")
 
     /* Get SOHM header size */
-    *hdr_size = (hsize_t) H5SM_TABLE_SIZE(f) +
-                           (hsize_t)(table->num_indexes * H5SM_INDEX_HEADER_SIZE(f));
+    *hdr_size = H5SM_TABLE_SIZE(f) + (table->num_indexes * H5SM_INDEX_HEADER_SIZE(f));
 
     /* Loop over all the indices for shared messages */
     for(u = 0; u < table->num_indexes; u++) {
         /* Get index storage size (for either B-tree or list) */
 	if(table->indexes[u].index_type == H5SM_BTREE) {
-	    if(H5F_addr_defined(table->indexes[u].index_addr))
-		if(H5B2_iterate_size(f, dxpl_id, H5SM_INDEX, table->indexes[u].index_addr, &(ih_info->index_size)) < 0)
-                    HGOTO_ERROR(H5E_BTREE, H5E_CANTGET, FAIL, "can't retrieve B-tree storage info")
+	    if(H5F_addr_defined(table->indexes[u].index_addr)) {
+                /* Open the index v2 B-tree */
+                if(NULL == (bt2 = H5B2_open(f, dxpl_id, table->indexes[u].index_addr)))
+                    HGOTO_ERROR(H5E_SOHM, H5E_CANTOPENOBJ, FAIL, "unable to open v2 B-tree for SOHM index")
+
+		if(H5B2_iterate_size_2(bt2, dxpl_id, &(ih_info->index_size)) < 0)
+                    HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "can't retrieve B-tree storage info")
+
+                /* Close the v2 B-tree */
+                if(H5B2_close(bt2, dxpl_id) < 0)
+                    HGOTO_ERROR(H5E_SOHM, H5E_CANTCLOSEOBJ, FAIL, "can't close v2 B-tree for SOHM index")
+                bt2 = NULL;
+            } /* end if */
         } /* end if */
-        else if(table->indexes[u].index_type == H5SM_LIST)
+        else {
+            HDassert(table->indexes[u].index_type == H5SM_LIST);
 	    ih_info->index_size += H5SM_LIST_SIZE(f, table->indexes[u].list_max);
+        } /* end else */
 
         /* Check for heap for this index */
 	if(H5F_addr_defined(table->indexes[u].heap_addr)) {
             /* Open the fractal heap for this index */
             if(NULL == (fheap = H5HF_open(f, dxpl_id, table->indexes[u].heap_addr)))
-                HGOTO_ERROR(H5E_HEAP, H5E_CANTOPENOBJ, FAIL, "unable to open fractal heap")
+                HGOTO_ERROR(H5E_SOHM, H5E_CANTOPENOBJ, FAIL, "unable to open fractal heap")
 
             /* Get heap storage size */
 	    if(H5HF_size(fheap, dxpl_id, &(ih_info->heap_size)) < 0)
-		HGOTO_ERROR(H5E_HEAP, H5E_CANTGET, FAIL, "can't retrieve fractal heap storage info")
+		HGOTO_ERROR(H5E_SOHM, H5E_CANTGET, FAIL, "can't retrieve fractal heap storage info")
 
-            /* Release the fractal heap */
+            /* Close the fractal heap */
             if(H5HF_close(fheap, dxpl_id) < 0)
-                HGOTO_ERROR(H5E_HEAP, H5E_CLOSEERROR, FAIL, "can't close fractal heap")
+                HGOTO_ERROR(H5E_SOHM, H5E_CANTCLOSEOBJ, FAIL, "can't close fractal heap")
             fheap = NULL;
         } /* end if */
     } /* end for */
@@ -2557,9 +2623,11 @@ H5SM_ih_size(H5F_t *f, hid_t dxpl_id, hsize_t *hdr_size, H5_ih_info_t *ih_info)
 done:
     /* Release resources */
     if(fheap && H5HF_close(fheap, dxpl_id) < 0)
-        HDONE_ERROR(H5E_HEAP, H5E_CLOSEERROR, FAIL, "can't close fractal heap")
+        HDONE_ERROR(H5E_SOHM, H5E_CANTCLOSEOBJ, FAIL, "can't close fractal heap")
+    if(bt2 && H5B2_close(bt2, dxpl_id) < 0)
+        HDONE_ERROR(H5E_SOHM, H5E_CANTCLOSEOBJ, FAIL, "can't close v2 B-tree for SOHM index")
     if(table && H5AC_unprotect(f, dxpl_id, H5AC_SOHM_TABLE, f->shared->sohm_addr, table, H5AC__NO_FLAGS_SET) < 0)
-        HDONE_ERROR(H5E_CACHE, H5E_CANTRELEASE, FAIL, "unable to close SOHM master table")
+        HDONE_ERROR(H5E_SOHM, H5E_CANTUNPROTECT, FAIL, "unable to close SOHM master table")
 
     FUNC_LEAVE_NOAPI(ret_value)
 } /* end H5SM_ih_size() */