// Unmounts the bind mount, and detaches the disk only if the disk
// resource was the last reference to that disk on the kubelet.
func (c *fcDiskUnmounter) TearDown() error {
	return c.TearDownAt(c.GetPath())
}

func (c *fcDiskUnmounter) TearDownAt(dir string) error {
	return mount.CleanupMountPoint(dir, c.mounter, false)
}

// Block Volumes Support
type fcDiskMapper struct {
	*fcDisk
	volume.MetricsProvider

	// removes traces of the SetUp procedure.
	TearDown() error
	// TearDown unmounts the volume from the specified directory and
	// removes traces of the SetUp procedure.
	TearDownAt(dir string) error
}

// BlockVolumeMapper interface is a mapper interface for block volume.
type BlockVolumeMapper interface {
	BlockVolume
}

	// Wrap EmptyDir, let it do the teardown.
	wrapped, err := host.NewWrapperUnmounter(volName, volSpec, podUID)
	if err != nil {
		return err
	}
	return wrapped.TearDownAt(dir)
}

// MountOptionFromSpec extracts and joins mount options from volume spec with supplied options
func MountOptionFromSpec(spec *volume.Spec, options ...string) []string {
	pv := spec.PersistentVolume