}
	var xl xlMetaV2
	err = xl.LoadOrConvert(buf)
	if err != nil {
		return err
	}
	foundDirs := make(map[string]struct{}, len(xl.versions))
	err = readDirFn(baseDir, func(name string, typ os.FileMode) error {
		if !typ.IsDir() {
			return nil
		}
		// See if directory has a UUID name.
		base := filepath.Base(name)
		_, err := uuid.Parse(base)
		if err == nil {
			foundDirs[base] = struct{}{}
		}