if w.reuseBlocks || o.reusable {
			metaDataPoolPut(o.metadata)
		}
	}

	return nil
}

// stream entries to the output.
// The returned channel should be closed when done.
// Any error is reported when closing the metacacheWriter.
func (w *metacacheWriter) stream() (chan<- metaCacheEntry, error) {
	if w.creator != nil {
		err := w.creator()
		w.creator = nil
		if err != nil {