AttachDisk(b fcDiskMounter) (string, error)
	// Detaches the disk from the kubelet's host machine.
	DetachDisk(disk fcDiskUnmounter, devicePath string) error
	// Detaches the block disk from the kubelet's host machine.
	DetachBlockFCDisk(disk fcDiskUnmapper, mntPath, devicePath string) error
}

// utility to mount a disk based filesystem

	arr := strings.Split(devicePath, "/")
	dev := arr[len(arr)-1]
	removeFromScsiSubsystem(dev, io)
	return nil
}

// DetachBlockFCDisk detaches a volume from kubelet node, removes scsi device file
// such as /dev/sdX from the node, and then removes loopback for the scsi device.
func (util *fcUtil) DetachBlockFCDisk(c fcDiskUnmapper, mapPath, devicePath string) error {
	// Check if devicePath is valid
	if len(devicePath) != 0 {

	globalPath := c.manager.MakeGlobalPDName(*c.fcDisk)
	err := os.RemoveAll(globalPath)
	if err != nil {
		return err
	}
	fake.detachCalled = true
	return nil
}

func (fake *fakeDiskManager) DetachBlockFCDisk(c fcDiskUnmapper, mapPath, devicePath string) error {
	err := os.RemoveAll(mapPath)
	if err != nil {
		return err
	}
	fake.detachCalled = true
	return nil
}

}

var _ volume.BlockVolumeUnmapper = &fcDiskUnmapper{}
var _ volume.CustomBlockVolumeUnmapper = &fcDiskUnmapper{}

func (c *fcDiskUnmapper) TearDownDevice(mapPath, devicePath string) error {
	err := c.manager.DetachBlockFCDisk(*c, mapPath, devicePath)
	if err != nil {
		return fmt.Errorf("fc: failed to detach disk: %s\nError: %v", mapPath, err)
	}
	klog.V(4).Infof("fc: %s is unmounted, deleting the directory", mapPath)