From: Alexander Block <ablock84@googlemail.com>
Date: Wed, 1 Aug 2012 10:46:05 +0000 (+0200)
Subject: Btrfs: fix check for changed extent in is_extent_unchanged
X-Git-Tag: accepted/tizen/common/20141203.182822~3484^2~114
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3954096d4b1adab6fbb3c26de37ddd4f781e072f;p=platform%2Fkernel%2Flinux-arm64.git

Btrfs: fix check for changed extent in is_extent_unchanged

The previous check was working fine, but this check should be
easier to read. Also, we could theoritically have some exotic
bugs with the previous checks.

Signed-off-by: Alexander Block <ablock84@googlemail.com>
---

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index cfbe987..35222d5 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -3819,8 +3819,8 @@ static int is_extent_unchanged(struct send_ctx *sctx,
 		/*
 		 * Check if we have the same extent.
 		 */
-		if (left_disknr + left_offset_fixed !=
-				right_disknr + right_offset) {
+		if (left_disknr != right_disknr ||
+		    left_offset_fixed != right_offset) {
 			ret = 0;
 			goto out;
 		}