linux-ext4 - [patch 274/354] ext4 balloc: fix off-by-one against grp

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Message-Id: <200612070439.kB74dJtu030003@shell0.pdx.osdl.net>
Date:	Wed, 06 Dec 2006 20:39:19 -0800
From:	akpm@...l.org
To:	torvalds@...l.org
Cc:	akpm@...l.org, hugh@...itas.com, cmm@...ibm.com,
	linux-ext4@...r.kernel.org
Subject: [patch 274/354] ext4 balloc: fix off-by-one against grp_goal

From: Hugh Dickins <hugh@...itas.com>

grp_goal 0 is a genuine goal (unlike -1), so ext4_try_to_allocate_with_rsv
should treat it as such.

Signed-off-by: Mingming Cao <cmm@...ibm.com>
Signed-off-by: Hugh Dickins <hugh@...itas.com>
Cc: <linux-ext4@...r.kernel.org>
Signed-off-by: Andrew Morton <akpm@...l.org>
---

 fs/ext4/balloc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff -puN fs/ext4/balloc.c~ext4-balloc-fix-off-by-one-against-grp_goal fs/ext4/balloc.c
--- a/fs/ext4/balloc.c~ext4-balloc-fix-off-by-one-against-grp_goal
+++ a/fs/ext4/balloc.c
@@ -1288,7 +1288,7 @@ ext4_try_to_allocate_with_rsv(struct sup
 	}
 	/*
 	 * grp_goal is a group relative block number (if there is a goal)
-	 * 0 < grp_goal < EXT4_BLOCKS_PER_GROUP(sb)
+	 * 0 <= grp_goal < EXT4_BLOCKS_PER_GROUP(sb)
 	 * first block is a filesystem wide block number
 	 * first block is the block number of the first block in this group
 	 */
@@ -1324,7 +1324,7 @@ ext4_try_to_allocate_with_rsv(struct sup
 			if (!goal_in_my_reservation(&my_rsv->rsv_window,
 							grp_goal, group, sb))
 				grp_goal = -1;
-		} else if (grp_goal > 0) {
+		} else if (grp_goal >= 0) {
 			int curr = my_rsv->rsv_end -
 					(grp_goal + group_first_block) + 1;
 
_
-
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