if w == nil || w.closer == nil {
		return nil
	}
	w.streamWg.Wait()
	err := w.closer()
	w.closer = nil
	return err
}

// Reset and start writing to new writer.
// Close must have been called before this.
func (w *metacacheWriter) Reset(out io.Writer) {
	w.streamErr = nil
	w.creator = func() error {
		s2w := s2.NewWriter(out, s2.WriterBlockSize(w.blockSize), s2.WriterConcurrency(2))

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