btrfs: cleanup orphans while looking up default subvolume

commit 727b9784b6085c99c2f836bf4fcc2848dc9cf904 upstream.

Orphans in the fs tree are cleaned up via open_ctree and subvolume
orphans are cleaned via btrfs_lookup_dentry -- except when a default
subvolume is in use.  The name for the default subvolume uses a manual
lookup that doesn't trigger orphan cleanup and needs to trigger it
manually as well. This doesn't apply to the remount case since the
subvolumes are cleaned up by walking the root radix tree.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 05fef198ff94fc8df4eb126a62195af8452fb18d..e477ed67a49ad3fa3a1ae03b9423367cd97789b6 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -901,6 +901,15 @@ find_root:
        if (IS_ERR(new_root))
                return ERR_CAST(new_root);
 
+       if (!(sb->s_flags & MS_RDONLY)) {
+               int ret;
+               down_read(&fs_info->cleanup_work_sem);
+               ret = btrfs_orphan_cleanup(new_root);
+               up_read(&fs_info->cleanup_work_sem);
+               if (ret)
+                       return ERR_PTR(ret);
+       }
+
        dir_id = btrfs_root_dirid(&new_root->root_item);
 setup_root:
        location.objectid = dir_id;