}
	if dataDir != "" {
		srcDataPath = retainSlash(pathJoin(srcVolumeDir, srcPath, dataDir))
		// make sure to always use path.Join here, do not use pathJoin as
		// it would additionally add `/` at the end and it comes in the
		// way of renameAll(), parentDir creation.
		dstDataPath = pathutil.Join(dstVolumeDir, dstPath, dataDir)
	}

	if err = checkPathLength(srcFilePath); err != nil {
		return 0, err
	}