linux-kernel - [PATCH 2/12] ext3 balloc: fix off-by-one against grp

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Message-Id: <1164773647.4341.36.camel@localhost.localdomain>
Date:	Tue, 28 Nov 2006 20:14:07 -0800
From:	Mingming Cao <cmm@...ibm.com>
To:	Andrew Morton <akpm@...l.org>, Hugh Dickins <hugh@...itas.com>
Cc:	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 2/12] ext3 balloc: fix off-by-one against grp_goal


------------------------------------------------------
Subject: ext2 balloc: fix off-by-one against grp_goal
From: Hugh Dickins <hugh@...itas.com>

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

Sync up with ext2 reservation fix  in ext3

Signed-off-by: Mingming Cao <cmm@...ibm.com>
---


---

 linux-2.6.19-rc5-cmm/fs/ext3/balloc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff -puN fs/ext3/balloc.c~ext3-balloc-fix-off-by-one-against-grp_goal fs/ext3/balloc.c
--- linux-2.6.19-rc5/fs/ext3/balloc.c~ext3-balloc-fix-off-by-one-against-grp_goal	2006-11-28 19:36:48.000000000 -0800
+++ linux-2.6.19-rc5-cmm/fs/ext3/balloc.c	2006-11-28 19:36:48.000000000 -0800
@@ -1271,7 +1271,7 @@ ext3_try_to_allocate_with_rsv(struct sup
 	}
 	/*
 	 * grp_goal is a group relative block number (if there is a goal)
-	 * 0 < grp_goal < EXT3_BLOCKS_PER_GROUP(sb)
+	 * 0 <= grp_goal < EXT3_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
 	 */
@@ -1307,7 +1307,7 @@ ext3_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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