From: Anand Jain <Anand.Jain@oracle.com>
Date: Thu, 25 Jul 2013 17:29:35 +0000 (+0800)
Subject: btrfs: use BTRFS_SUPER_INFO_SIZE macro at btrfs_read_dev_super()
X-Git-Tag: v3.12-rc1~40^2~88
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=8068a47e2a77ecae27cfd0298e8732756f565ed1;p=~emulex%2Finfiniband.git

btrfs: use BTRFS_SUPER_INFO_SIZE macro at btrfs_read_dev_super()

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
---

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 8e2eee67c3a..13564354c92 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2984,9 +2984,11 @@ struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
 	 */
 	for (i = 0; i < 1; i++) {
 		bytenr = btrfs_sb_offset(i);
-		if (bytenr + 4096 >= i_size_read(bdev->bd_inode))
+		if (bytenr + BTRFS_SUPER_INFO_SIZE >=
+					i_size_read(bdev->bd_inode))
 			break;
-		bh = __bread(bdev, bytenr / 4096, 4096);
+		bh = __bread(bdev, bytenr / 4096,
+					BTRFS_SUPER_INFO_SIZE);
 		if (!bh)
 			continue;