Btrfs: handle EAGAIN case properly in btrfs_drop_snapshot()

commit 90515e7f5d7d24cbb2a4038a3f1b5cfa2921aa17 upstream.

We may return early in btrfs_drop_snapshot(), we shouldn't
call btrfs_std_err() for this case, fix it.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index d58bef1..b256ddc 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -7718,7 +7718,7 @@ out:
         */
        if (!for_reloc && root_dropped == false)
                btrfs_add_dead_root(root);
-       if (err)
+       if (err && err != -EAGAIN)
                btrfs_std_error(root->fs_info, err);
        return err;
 }