type xlMetaDataDirDecoder struct {
	ObjectV2 *struct {
		DataDir [16]byte `msg:"DDir"` // Data dir ID
	} `msg:"V2Obj,omitempty"`
}

// UpdateObjectVersion updates metadata and modTime for a given
// versionID, NOTE: versionID must be valid and should exist -
// and must not be a DeleteMarker or legacy object, if no

	if !isXL2V1Format(buf) {
		return errFileVersionNotFound
	}

	var xlMeta xlMetaV2
	if err = xlMeta.Load(buf); err != nil {
		return err
	}

	if err = xlMeta.UpdateObjectVersion(fi); err != nil {
		return err
	}

	wbuf, err := xlMeta.AppendTo(metaDataPoolGet())
	if err != nil {
		return err
	}
	defer metaDataPoolPut(wbuf)