mounter := plugin.host.GetMounter(plugin.GetPluginName())
	refs, err := mounter.GetMountRefs(mountPath)
	if err != nil {
		return volume.ReconstructedVolume{}, err
	}
	baseMountPath := plugin.generateBlockDeviceBaseGlobalPath()
	for _, ref := range refs {
		if mount.PathWithinBase(ref, baseMountPath) {
			// If the global mount for block device exists, the source is block
			// device.