[PATCH] btrfs: fix disk-io.c/btrfs_read_dev_super with BTRFS_SUPER_MIRROR_MAXto control the loops

[Wang Sheng-Hui]

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

Signed-off-by: Wang Sheng-Hui <shhuiw@xxxxxxxxx>
---
 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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