if err := m.send(msg); err != nil {
		return nil, err
	}
	if debugReqs {
		fmt.Println(m.MuxID, m.parent.String(), "SEND")
	}
	// Wait for response or context.
	select {
	case v, ok := <-ch:
		if !ok {
			return nil, ErrDisconnected
		}
		if debugReqs && v.Err != nil {
			v.Err = fmt.Errorf("%d %s RESP ERR: %w", m.MuxID, m.parent.String(), v.Err)
		}
		return v.Msg, v.Err
	case <-ctx.Done():
		if debugReqs {

	// we should return 'errs' from per disk
	if isAllNotFound(errs) {
		if isAllVolumeNotFound(errs) {
			return errVolumeNotFound
		}
		return nil
	}

	if err != nil {
		return err
	}

	if contextCanceled(ctx) {
		return ctx.Err()
	}

	for _, err := range errs {
		if errors.Is(err, io.EOF) {
			continue
		}

		return
	}

	if err = cfg.DelFrom(bytes.NewReader(kvBytes)); err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

	if err = validateConfig(ctx, cfg, subSys); err != nil {
		writeCustomErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrAdminConfigBadJSON), err.Error(), r.URL)
		return
	}

	// Check if subnet proxy being deleted and if so the value of proxy of subnet

	if countErrs(errs, errDiskAccessDenied) == len(errs) {
		return errDiskAccessDenied
	}

	if countErrs(errs, errFileAccessDenied) == len(errs) {
		return errDiskAccessDenied
	}

	if countErrs(errs, errDiskNotDir) == len(errs) {
		return errDiskNotDir
	}

	if countErrs(errs, errFaultyDisk) == len(errs) {
		return errFaultyDisk
	}

	if countErrs(errs, errXLBackend) == len(errs) {

}

// Checks bucket and object name validity, returns nil if both are valid.
func checkBucketAndObjectNames(ctx context.Context, bucket, object string) error {
	// Verify if bucket is valid.
	if !isMinioMetaBucketName(bucket) && s3utils.CheckValidBucketNameStrict(bucket) != nil {
		return BucketNameInvalid{Bucket: bucket}
	}
	// Verify if object is valid.
	if len(object) == 0 {
		return ObjectNameInvalid{Bucket: bucket, Object: object}

func (r *metacacheReader) readN(n int, inclDeleted, inclDirs, inclVersions bool, prefix string) (metaCacheEntriesSorted, error) {
	r.checkInit()
	if n == 0 {
		return metaCacheEntriesSorted{}, nil
	}
	if r.err != nil {
		return metaCacheEntriesSorted{}, r.err
	}

	var res metaCacheEntries
	if n > 0 {
		res = make(metaCacheEntries, 0, n)
	}
	if prefix != "" {

		return errTierNameNotUppercase
	}

	// check if tier name already in use
	if _, exists := config.isTierNameInUse(tierName); exists {
		return errTierAlreadyExists
	}

	d, err := newWarmBackend(ctx, tier, true)
	if err != nil {
		return err
	}

	if !ignoreInUse {
		// Check if warmbackend is in use by other MinIO tenants
		inUse, err := d.InUse(ctx)
		if err != nil {
			return err
		}
		if inUse {

		if err != nil {
			if xnet.IsNetworkOrHostDown(err, expectTimeouts) {
				if !c.NoMetrics {
					atomic.AddUint64(&globalStats.errs, 1)
				}
				if c.MarkOffline(err) {
					logger.LogOnceIf(ctx, logSubsys, fmt.Errorf("Marking %s offline temporarily; caused by %w", c.url.Host, err), c.url.Host)
				}
			}
			return nil, err
		}
		if len(b) > 0 {

// successfully the version only if the backend is Erasure.
func formatGetBackendErasureVersion(b []byte) (string, error) {
	meta := &formatMetaV1{}
	if err := json.Unmarshal(b, meta); err != nil {
		return "", err
	}
	if meta.Version != formatMetaVersionV1 {
		return "", fmt.Errorf(`format.Version expected: %s, got: %s`, formatMetaVersionV1, meta.Version)
	}

	}
	// Check if bucket exists.
	if !r.OutputLocation.IsEmpty() {
		if _, err := objAPI.GetBucketInfo(ctx, r.OutputLocation.S3.BucketName, BucketOptions{}); err != nil {
			return err
		}
		if r.OutputLocation.S3.Prefix == "" {
			return fmt.Errorf("Prefix is a required parameter in OutputLocation")
		}
		if r.OutputLocation.S3.Encryption.EncryptionType != xhttp.AmzEncryptionAES {
			return NotImplemented{}
		}
	}