// If server is in shutdown.
		if atomic.LoadUint32(&srv.inShutdown) != 0 {
			// To indicate disable keep-alive, server is shutting down.
			w.Header().Set("Connection", "close")

			// Add 1 minute retry header, incase-client wants to honor it
			w.Header().Set(RetryAfter, "60")

			w.WriteHeader(http.StatusServiceUnavailable)
			w.Write([]byte(http.ErrServerClosed.Error()))
			return
		}

	_, err := blob.Delete(ctx, azblob.DeleteSnapshotsOptionNone, azblob.BlobAccessConditions{})
	return azureToObjectError(err, az.Bucket, object)
}

func (az *warmBackendAzure) InUse(ctx context.Context) (bool, error) {
	containerURL := az.serviceURL.NewContainerURL(az.Bucket)
	resp, err := containerURL.ListBlobsHierarchySegment(ctx, azblob.Marker{}, "/", azblob.ListBlobsSegmentOptions{
		Prefix:     az.Prefix,

	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 {
			return errTierBackendInUse
		}
	}

	config.Tiers[tierName] = tier
	config.drivercache[tierName] = d

	return nil
}

	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"

// checkWarmBackend checks if tier config credentials have sufficient privileges
// to perform all operations defined in the WarmBackend interface.

			if opts.Interface != "" {
				if h, _, err := net.SplitHostPort(address); err == nil {
					address = h
				}
				// Create socket on specific vrf device.
				// To catch all kinds of special cases this filters specifically for loopback networks.
				if ip := net.ParseIP(address); ip != nil && !ip.IsLoopback() {
					_ = syscall.SetsockoptString(fd, syscall.SOL_SOCKET, syscall.SO_BINDTODEVICE, opts.Interface)

	err := gcs.client.Bucket(gcs.Bucket).Object(gcs.getDest(key)).Delete(ctx)
	return gcsToObjectError(err, gcs.Bucket, key)
}

func (gcs *warmBackendGCS) InUse(ctx context.Context) (bool, error) {
	it := gcs.client.Bucket(gcs.Bucket).Objects(ctx, &storage.Query{
		Delimiter: "/",
		Prefix:    gcs.Prefix,
		Versions:  false,
	})
	pager := iterator.NewPager(it, 1, "")

	if rv != "" {
		ropts.VersionID = string(rv)
	}
	err := s3.client.RemoveObject(ctx, s3.Bucket, s3.getDest(object), ropts)
	return s3.ToObjectError(err, object)
}

func (s3 *warmBackendS3) InUse(ctx context.Context) (bool, error) {
	result, err := s3.core.ListObjectsV2(s3.Bucket, s3.Prefix, "", "", slashSeparator, 1)
	if err != nil {
		return false, s3.ToObjectError(err)
	}

	binary.LittleEndian.PutUint16(xlVersionCurrent[2:4], xlVersionMinor)
}

// The []journal contains all the different versions of the object.
//
// This array can have 3 kinds of objects:
//
// ``object``: If the object is uploaded the usual way: putobject, multipart-put, copyobject
//
// ``delete``: This is the delete-marker
//