[XFS] validate_fields is called on a vnode to update directory related

fields after a create/remove etc. Make sure we pass in all the
flags for the status fields we want. NBLOCKS was missing and
working by accident.

SGI Modid: 2.5.x-xfs:slinx:134817a

fs/xfs/linux/xfs_iops.c

@@ -45,7 +45,7 @@ validate_fields(
 	vattr_t		va;
 	int		error;
 
-	va.va_mask = XFS_AT_NLINK|XFS_AT_SIZE;
+	va.va_mask = XFS_AT_NLINK|XFS_AT_SIZE|XFS_AT_NBLOCKS;
 	VOP_GETATTR(vp, &va, ATTR_LAZY, NULL, error);
 	ip->i_nlink = va.va_nlink;
 	ip->i_size = va.va_size;

fs/xfs/xfs_vnodeops.c

@@ -125,7 +125,8 @@ xfs_getattr(
 	 * Quick exit for non-stat callers
 	 */
 	if ((vap->va_mask &
-	    ~(XFS_AT_SIZE|XFS_AT_FSID|XFS_AT_NODEID|XFS_AT_NLINK)) == 0) {
+	    ~(XFS_AT_SIZE|XFS_AT_FSID|XFS_AT_NODEID|
+	      XFS_AT_NLINK|XFS_AT_BLKSIZE)) == 0) {
 		if (!(flags & ATTR_LAZY))
 			xfs_iunlock(ip, XFS_ILOCK_SHARED);
 		return 0;