dstVolumeDir, err := s.getVolDir(dstVolume)
	if err != nil {
		return res, err
	}

	if !skipAccessChecks(srcVolume) {
		// Stat a volume entry.
		if err = Access(srcVolumeDir); err != nil {
			return res, convertAccessError(err, errVolumeAccessDenied)
		}
	}

	if !skipAccessChecks(dstVolume) {
		if err = Access(dstVolumeDir); err != nil {

	s.RLock()
	legacy := s.formatLegacy
	s.RUnlock()

	// Verify if volume is valid and it exists.
	volumeDir, err := s.getVolDir(opts.Bucket)
	if err != nil {
		return err
	}

	if !skipAccessChecks(opts.Bucket) {
		// Stat a volume entry.
		if err = Access(volumeDir); err != nil {
			return convertAccessError(err, errVolumeAccessDenied)
		}
	}

	// Use a small block size to start sending quickly