return nil, errors.New("missing volume id")
	}
	if req.GetTargetPath() == "" {
		return nil, errors.New("missing target path")
	}
	fsTypes := "block|ext4|xfs|zfs"
	fsType := req.GetVolumeCapability().GetMount().GetFsType()
	if !strings.Contains(fsTypes, fsType) {
		return nil, errors.New("invalid fstype")
	}

	if req.GetVolumeId() == NodePublishTimeOut_VolumeID {