linux-kernel - [PATCH 4/6] ext2 balloc: fix off-by-one against grp

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Date:	Tue, 28 Nov 2006 17:42:41 +0000 (GMT)
From:	Hugh Dickins <hugh@...itas.com>
To:	Mingming Cao <cmm@...ibm.com>
cc:	Andrew Morton <akpm@...l.org>, Mel Gorman <mel@...net.ie>,
	"Martin J. Bligh" <mbligh@...igh.org>,
	linux-kernel@...r.kernel.org,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: [PATCH 4/6] ext2 balloc: fix off-by-one against grp_goal

grp_goal 0 is a genuine goal (unlike -1),
so ext2_try_to_allocate_with_rsv should treat it as such.

Signed-off-by: Hugh Dickins <hugh@...itas.com>
---

 fs/ext2/balloc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- 2.6.19-rc6-mm2/fs/ext2/balloc.c	2006-11-24 08:18:02.000000000 +0000
+++ linux/fs/ext2/balloc.c	2006-11-27 19:28:41.000000000 +0000
@@ -1053,7 +1053,7 @@ ext2_try_to_allocate_with_rsv(struct sup
 	}
 	/*
 	 * grp_goal is a group relative block number (if there is a goal)
-	 * 0 < grp_goal < EXT2_BLOCKS_PER_GROUP(sb)
+	 * 0 <= grp_goal < EXT2_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
 	 */
@@ -1089,7 +1089,7 @@ ext2_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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