Require FAPL in H5Pset_vol()

release_docs/RELEASE.txt

@@ -392,6 +392,12 @@ New Features
       Modifying default property lists was never fully supported and could produce
       inconsistent and unexpected behavior. 
 
+    - H5Pset_vol() now fails when used on a non-file-access property list
+
+      Similar to the above. Setting the connector on a non-FAPL had no effect on
+      library behavior, and the connector ID and information could not be read back
+      from that plist later.
+
     Parallel Library:
     -----------------
     -

src/H5Pfapl.c

@@ -5829,7 +5829,7 @@ H5Pset_vol(hid_t plist_id, hid_t new_vol_id, const void *new_vol_info)
     FUNC_ENTER_API(FAIL)
 
     /* Check arguments */
-    if (NULL == (plist = (H5P_genplist_t *)H5I_object_verify(plist_id, H5I_GENPROP_LST)))
+    if (NULL == (plist = (H5P_genplist_t *)H5P_object_verify(plist_id, H5P_FILE_ACCESS, false)))
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list");
     if (H5P_is_default_plist(plist_id))
         HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "can't change VOL connector on a default property list");