From: Hugh Dickins <hugh@veritas.com>
Date: Thu, 7 Dec 2006 04:39:20 +0000 (-0800)
Subject: [PATCH] ext4 balloc: fix off-by-one against rsv_end
X-Git-Tag: v2.6.20-rc1~145^2^2~88
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b2f2c76d17b68869914a1ec3ab04c7674668f60d;p=linux-2.6

[PATCH] ext4 balloc: fix off-by-one against rsv_end

rsv_end is the last block within the reservation, so alloc_new_reservation
should accept start_block == rsv_end as success.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 2bcca5261e..c5589b3f58 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -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