linux-kernel - [PATCH 9/12] ext4 balloc: fix off-by-one against rsv

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Message-Id: <1164773715.4341.43.camel@localhost.localdomain>
Date:	Tue, 28 Nov 2006 20:15:15 -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 9/12] ext4 balloc: fix off-by-one against rsv_end


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

rsv_end is the last block within the reservation, so alloc_new_reservation
should accept start_block == rsv_end as success.
------------------------------------------------------
Sync up  a ext2 reservation fix in ext4
Signed-Off-By: Mingming Cao <cmm@...ibm.com>


---

 linux-2.6.19-rc5-cmm/fs/ext4/balloc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN fs/ext4/balloc.c~ext4-balloc-fix-off-by-one-against-rsv_end fs/ext4/balloc.c
--- linux-2.6.19-rc5/fs/ext4/balloc.c~ext4-balloc-fix-off-by-one-against-rsv_end	2006-11-28 19:37:15.000000000 -0800
+++ linux-2.6.19-rc5-cmm/fs/ext4/balloc.c	2006-11-28 19:37:15.000000000 -0800
@@ -1165,7 +1165,7 @@ retry:
 	 * check if the first free block is within the
 	 * free space we just reserved
 	 */
-	if (start_block >= my_rsv->rsv_start && start_block < my_rsv->rsv_end)
+	if (start_block >= my_rsv->rsv_start && start_block <= my_rsv->rsv_end)
 		return 0;		/* success */
 	/*
 	 * if the first free bit we found is out of the reservable space

_


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