}

var flateReaderPool sync.Pool

func newFlateReader(r io.Reader) io.ReadCloser {
	fr, ok := flateReaderPool.Get().(io.ReadCloser)
	if ok {
		fr.(flate.Resetter).Reset(r, nil)
	} else {
		fr = flate.NewReader(r)
	}
	return &pooledFlateReader{fr: fr}
}

type pooledFlateReader struct {
	mu sync.Mutex // guards Close and Read
	fr io.ReadCloser
}

func (r *pooledFlateReader) Read(p []byte) (n int, err error) {

	m.wg.Wait()
	close(m.opCh)
	atomic.StoreInt32(&m.closed, 1)

	if len(m.opCh) > 0 {
		healingLogEvent(context.Background(), "Saving MRF healing data (%d entries)", len(m.opCh))
	}

	newReader := func() io.ReadCloser {
		r, w := io.Pipe()
		go func() {
			// Initialize MRF meta header.
			var data [4]byte
			binary.LittleEndian.PutUint16(data[0:2], healMRFMetaFormat)

// out of HTTP "chunked" format before returning it.
// The s3ChunkedReader returns io.EOF when the final 0-length chunk is read.
func newUnsignedV4ChunkedReader(req *http.Request, trailer bool, signature bool) (io.ReadCloser, APIErrorCode) {
	if signature {
		if errCode := doesSignatureMatch(unsignedPayloadTrailer, req, globalSite.Region(), serviceS3); errCode != ErrNone {
			return nil, errCode
		}
	}
	if trailer {

	PutWithMeta(ctx context.Context, object string, r io.Reader, length int64, meta map[string]string) (remoteVersionID, error)
	Get(ctx context.Context, object string, rv remoteVersionID, opts WarmBackendGetOpts) (io.ReadCloser, error)
	Remove(ctx context.Context, object string, rv remoteVersionID) error
	InUse(ctx context.Context) (bool, error)
}

const probeObject = "probeobject"

	CreateFile(ctx context.Context, origvolume, olume, path string, size int64, reader io.Reader) error
	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

	return s3.PutWithMeta(ctx, object, r, length, map[string]string{})
}

func (s3 *warmBackendS3) Get(ctx context.Context, object string, rv remoteVersionID, opts WarmBackendGetOpts) (io.ReadCloser, error) {
	gopts := minio.GetObjectOptions{}

	if rv != "" {
		gopts.VersionID = string(rv)
	}
	if opts.startOffset >= 0 && opts.length > 0 {

	return gcs.PutWithMeta(ctx, key, data, length, map[string]string{})
}

func (gcs *warmBackendGCS) Get(ctx context.Context, key string, rv remoteVersionID, opts WarmBackendGetOpts) (r io.ReadCloser, err error) {
	// GCS storage decompresses a gzipped object by default and returns the data.
	// Refer to https://cloud.google.com/storage/docs/transcoding#decompressive_transcoding

	return az.PutWithMeta(ctx, object, r, length, map[string]string{})
}

func (az *warmBackendAzure) Get(ctx context.Context, object string, rv remoteVersionID, opts WarmBackendGetOpts) (r io.ReadCloser, err error) {
	if opts.startOffset < 0 {
		return nil, InvalidRange{}
	}
	resp, err := az.clnt.DownloadStream(ctx, az.Bucket, az.getDest(object), &azblob.DownloadStreamOptions{