Btrfs: mnt_drop_write in ioctl_trans_end

Add missing mnt_drop_write to match the mnt_want_write in
btrfs_ioctl_trans_start.

Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 6228b69c2b93..69c4a07f5869 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1059,6 +1059,8 @@ long btrfs_ioctl_trans_end(struct file *file)
         root->fs_info->open_ioctl_trans--;
         mutex_unlock(&root->fs_info->trans_mutex);
 
+        mnt_drop_write(file->f_path.mnt);
+
 out:
         return ret;
 }