ReadFileStream(ctx context.Context, volume, path string, offset, length int64) (io.ReadCloser, error)
	RenameFile(ctx context.Context, srcVolume, srcPath, dstVolume, dstPath string) error
	RenamePart(ctx context.Context, srcVolume, srcPath, dstVolume, dstPath string, meta []byte, skipParent string) error
	CheckParts(ctx context.Context, volume string, path string, fi FileInfo) (*CheckPartsResp, error)

	if !opts.NoAuditLog {
		auditObjectErasureSet(ctx, "NewMultipartUpload", object, &er)
	}

	return er.newMultipartUpload(ctx, bucket, object, opts)
}

// renamePart - renames multipart part to its relevant location under uploadID.
func (er erasureObjects) renamePart(ctx context.Context, disks []StorageAPI, srcBucket, srcEntry, dstBucket, dstEntry string, optsMeta []byte, writeQuorum int, skipParent string) ([]StorageAPI, error) {

		return p.storage.ReadFileStream(ctx, volume, path, offset, length)
	})
}

func (p *xlStorageDiskIDCheck) RenamePart(ctx context.Context, srcVolume, srcPath, dstVolume, dstPath string, meta []byte, skipParent string) (err error) {
	ctx, done, err := p.TrackDiskHealth(ctx, storageMetricRenamePart, srcVolume, srcPath, dstVolume, dstPath)

	} else {
		s.deleteFile(srcVolumeDir, pathutil.Dir(srcFilePath), true, false)
	}
	return res, nil
}

// RenamePart - rename part path to destination path atomically, this is meant to be used
// only with multipart API
func (s *xlStorage) RenamePart(ctx context.Context, srcVolume, srcPath, dstVolume, dstPath string, meta []byte, skipParent string) (err error) {
	srcVolumeDir, err := s.getVolDir(srcVolume)

func (s *storageRESTServer) RenamePartHandler(p *RenamePartHandlerParams) (grid.NoPayload, *grid.RemoteErr) {
	if !s.checkID(p.DiskID) {
		return grid.NewNPErr(errDiskNotFound)
	}
	return grid.NewNPErr(s.getStorage().RenamePart(context.Background(), p.SrcVolume, p.SrcFilePath, p.DstVolume, p.DstFilePath, p.Meta, p.SkipParent))
}

// CleanAbandonedDataHandler - Clean unused data directories.