Btrfs: check the return value of btrfs_start_delalloc_inodes()

We forget to check the return value of btrfs_start_delalloc_inodes(), fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 66dbc8dbddf7..7ba7b3900cb8 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -465,7 +465,11 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
          * flush all outstanding I/O and inode extent mappings before the
          * copy operation is declared as being finished
          */
-        btrfs_start_delalloc_inodes(root, 0);
+        ret = btrfs_start_delalloc_inodes(root, 0);
+        if (ret) {
+                mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
+                return ret;
+        }
         btrfs_wait_ordered_extents(root, 0);
 
         trans = btrfs_start_transaction(root, 0);