[PATCH] fix regression in xfs_buf_rele

Fix regression in xfs_buf_rele dealing with non-hashed buffers, as
occur during log replay.  Novell bug 145204, Fedora bug 177848.
Signed-off-by: Nathan Scott <nathans@sgi.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

fs/xfs/linux-2.6/xfs_buf.c

@@ -830,6 +830,13 @@ pagebuf_rele(
 
 	PB_TRACE(pb, "rele", pb->pb_relse);
 
+	if (unlikely(!hash)) {
+		ASSERT(!pb->pb_relse);
+		if (atomic_dec_and_test(&pb->pb_hold))
+			xfs_buf_free(pb);
+		return;
+	}
+
 	if (atomic_dec_and_lock(&pb->pb_hold, &hash->bh_lock)) {
 		if (pb->pb_relse) {
 			atomic_inc(&pb->pb_hold);