Signed-off-by: Anand Jain <anand.j...@oracle.com>
---
 fs/btrfs/disk-io.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index dfe6864..de5884f 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2982,9 +2982,11 @@ 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;
 
-- 
1.7.1

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