Btrfs: fix freeze vs auto defrag

If we freeze the fs, the auto defragment should not run. Fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 3c6f7479cd5b..d415a052ca9a 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -318,8 +318,11 @@ static int __btrfs_run_defrag_inode(struct btrfs_fs_info *fs_info,
         memset(&range, 0, sizeof(range));
         range.len = (u64)-1;
         range.start = defrag->last_offset;
+
+        sb_start_write(fs_info->sb);
         num_defrag = btrfs_defrag_file(inode, NULL, &range, defrag->transid,
                                        BTRFS_DEFRAG_BATCH);
+        sb_end_write(fs_info->sb);
         /*
          * if we filled the whole defrag batch, there
          * must be more work to do.  Queue this defrag