Btrfs: quota tree support and startup

Init the quota tree along with the others on open_ctree
and close_ctree. Add the quota tree to the list of well
known trees in btrfs_read_fs_root_no_name.

Signed-off-by: Arne Jansen <sensille@gmx.net>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index ccba9b6..2ba03b9 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2967,6 +2967,7 @@
 	kfree(fs_info->chunk_root);
 	kfree(fs_info->dev_root);
 	kfree(fs_info->csum_root);
+	kfree(fs_info->quota_root);
 	kfree(fs_info->super_copy);
 	kfree(fs_info->super_for_commit);
 	kfree(fs_info);