AttachDisk(b iscsiDiskMounter) (string, error)
	// Detaches the disk from the kubelet's host machine.
	DetachDisk(disk iscsiDiskUnmounter, mntPath string) error
	// Detaches the block disk from the kubelet's host machine.
	DetachBlockISCSIDisk(disk iscsiDiskUnmapper, mntPath string) error
}

// utility to mount a disk based filesystem
// globalPDPath: global mount path like, /var/lib/kubelet/plugins/kubernetes.io/iscsi/{ifaceName}/{portal-some_iqn-lun-lun_id}

	globalPath := c.manager.MakeGlobalPDName(*c.iscsiDisk)
	err := os.RemoveAll(globalPath)
	if err != nil {
		return err
	}
	return nil
}

func (fake *fakeDiskManager) DetachBlockISCSIDisk(c iscsiDiskUnmapper, mntPath string) error {
	globalPath := c.manager.MakeGlobalVDPDName(*c.iscsiDisk)
	err := os.RemoveAll(globalPath)
	if err != nil {
		return err
	}
	return nil
}

	if err != nil {
		return fmt.Errorf("failed to finish detachISCSIDisk, err: %v", err)
	}
	return nil
}

// DetachBlockISCSIDisk removes loopback device for a volume and detaches a volume from node
func (util *ISCSIUtil) DetachBlockISCSIDisk(c iscsiDiskUnmapper, mapPath string) error {
	if pathExists, pathErr := mount.PathExists(mapPath); pathErr != nil {

// chance that operations are done on kubelet node during volume teardown sequences.
func (c *iscsiDiskUnmapper) TearDownDevice(mapPath, _ string) error {
	err := c.manager.DetachBlockISCSIDisk(*c, mapPath)
	if err != nil {
		return fmt.Errorf("iscsi: failed to detach disk: %s\nError: %v", mapPath, err)
	}
	klog.V(4).Infof("iscsi: %q is unmounted, deleting the directory", mapPath)