[XFS] Add lockdep support for XFS

SGI-PV: 963965
SGI-Modid: xfs-linux-melb:xfs-kern:28485a

Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

fs/xfs/xfs_vfsops.c

@@ -696,7 +696,7 @@ xfs_unmount_flush(
 	bhv_vnode_t	*rvp = XFS_ITOV(rip);
 	int		error;
 
-	xfs_ilock(rip, XFS_ILOCK_EXCL);
+	xfs_ilock(rip, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
 	xfs_iflock(rip);
 
 	/*