func closeBitrotWriters(ws []io.Writer) {
	for _, w := range ws {
		if w != nil {
			if bw, ok := w.(io.Closer); ok {
				bw.Close()
			}
		}
	}
}

// Returns hash sum for whole-bitrot, nil for streaming-bitrot.
func bitrotWriterSum(w io.Writer) []byte {
	if bw, ok := w.(*wholeBitrotWriter); ok {
		return bw.Sum(nil)
	}
	return nil
}

// Returns the size of the file with bitrot protection

		t.Fatal(err)
	}
	_, err = writer.Write([]byte("aaaaaaaaaa"))
	if err != nil {
		t.Fatal(err)
	}
	_, err = writer.Write([]byte("aaaaa"))
	if err != nil {
		t.Fatal(err)
	}
	if bw, ok := writer.(io.Closer); ok {
		bw.Close()
	}

	reader := newBitrotReader(disk, nil, volume, filePath, 35, bitrotAlgo, bitrotWriterSum(writer), 10)
	b := make([]byte, 10)
	if _, err = reader.ReadAt(b, 0); err != nil {
		t.Fatal(err)

	r, w := io.Pipe()
	h := algo.New()

	bw := &streamingBitrotWriter{
		iow:          ioutil.NewDeadlineWriter(w, globalDriveConfig.GetMaxTimeout()),
		closeWithErr: w.CloseWithError,
		h:            h,
		shardSize:    shardSize,
		canClose:     &sync.WaitGroup{},
	}
	bw.canClose.Add(1)
	go func() {
		defer bw.canClose.Done()

	bwMap := bwRpt.BucketStats
	for arn, st := range stats.ReplicationStats.Stats {
		for opts, bw := range bwMap {
			if opts.ReplicationARN != "" && opts.ReplicationARN == arn {
				st.BandWidthLimitInBytesPerSecond = bw.LimitInBytesPerSecond
				st.CurrentBandwidthInBytesPerSecond = bw.CurrentBandwidthInBytesPerSecond
				stats.ReplicationStats.Stats[arn] = st
			}
		}
	}

	bs := []byte(str)
	for i := 0; i < b.N; i++ {
		bw := NewWriter(io.Discard)
		bw.Flush()
		bw.WriteByte('a')
		bw.Flush()
		bw.WriteRune('B')
		bw.Flush()
		bw.Write(bs)
		bw.Flush()
		bw.WriteString(str)
		bw.Flush()
	}
}

func BenchmarkWriterFlush(b *testing.B) {
	b.ReportAllocs()
	bw := NewWriter(io.Discard)
	str := strings.Repeat("x", 50)

		}
		comma := strings.Index(f, ",")
		for cname := range cmap {
			f2 := fmt.Sprintf("%s (%s)%s", f[:comma], cname, f[comma:])
			features = append(features, f2)
		}
	}

	bw := bufio.NewWriter(os.Stdout)
	defer bw.Flush()

	var required []string
	for _, file := range checkFiles {
		required = append(required, fileFeatures(file, needApproval(file))...)
	}
	for _, file := range nextFiles {

					exit = true
				}
			}
			metaMu.Unlock()
		}
	}()

	const retryDelay = 200 * time.Millisecond
	const maxTries = 5

	// Keep destination...
	// Write results to disk.
	bw := newMetacacheBlockWriter(entries, func(b *metacacheBlock) error {
		// if the block is 0 bytes and its a first block skip it.
		// skip only this for Transient caches.
		if len(b.data) == 0 && b.n == 0 && o.Transient {