linux-kernel - [PATCH] btrfs: fix disk-io.c/btrfs_read_dev_super with BTRFS_SUPER_MIRROR

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Message-ID: <504D8AEB.9090401@gmail.com>
Date:	Mon, 10 Sep 2012 14:38:35 +0800
From:	Wang Sheng-Hui <shhuiw@...il.com>
To:	chris.mason@...ionio.com, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] btrfs: fix disk-io.c/btrfs_read_dev_super with BTRFS_SUPER_MIRROR_MAX
 to control the loops

To check the duplicated super blocks, use BTRFS_SUPER_MIRROR_MAX
as the loops limit.

Signed-off-by: Wang Sheng-Hui <shhuiw@...il.com>
---
 fs/btrfs/disk-io.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 22e98e0..a431144 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2723,7 +2723,7 @@ struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
 	 * So, we need to add a special mount option to scan for
 	 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
 	 */
-	for (i = 0; i < 1; i++) {
+	for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
 		bytenr = btrfs_sb_offset(i);
 		if (bytenr + 4096 >= i_size_read(bdev->bd_inode))
 			break;
-- 
1.7.1

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