// are all ready (before sources are ready, pods are probably missing)
//
// operationExecutor - used to trigger attach/detach/mount/unmount operations
// safely (prevents more than one operation from being triggered on the same
// volume)
//
// mounter - mounter passed in from kubelet, passed down unmount path
//
// hostutil - hostutil passed in from kubelet
//
// volumePluginMgr - volume plugin manager passed from kubelet

	OuterVolumeSpecName string

	// PluginName is the "Unescaped Qualified" name of the volume plugin used to
	// mount and unmount this volume. It can be used to fetch the volume plugin
	// to unmount with, on demand. It is also the name that plugins use, though
	// escaped, in their pod mount path, i.e.
	// /var/lib/kubelet/pods/{podUID}/volumes/{escapeQualifiedPluginName}/{outerVolumeSpecName}/
	PluginName string

	// The data structure is populated upon successful completion of attach,
	// detach, mount, and unmount actions triggered by the reconciler.
	actualStateOfWorld cache.ActualStateOfWorld

	// operationExecutor is used to start asynchronous attach, detach, mount,
	// and unmount operations.
	operationExecutor operationexecutor.OperationExecutor

	const mountNotSupported = "mount is not supported: " // Output prefix indicating a test skip.
	if os.Getenv("GO_WANT_HELPER_PROCESS") == "1" {
		dir := flag.Args()[0]
		err := syscall.Mount("none", dir, "proc", 0, "")
		if testenv.SyscallIsNotSupported(err) {
			fmt.Print(mountNotSupported, err)
		} else if err != nil {
			fmt.Fprintf(os.Stderr, "unshare: mount %s: %v\n", dir, err)
			os.Exit(2)
		}

var _ volume.Unmounter = &localVolumeUnmounter{}

// TearDown unmounts the bind mount
func (u *localVolumeUnmounter) TearDown() error {
	return u.TearDownAt(u.GetPath())
}

// TearDownAt unmounts the bind mount
func (u *localVolumeUnmounter) TearDownAt(dir string) error {
	klog.V(4).Infof("Unmounting volume %q at path %q\n", u.volName, dir)
	return mount.CleanupMountPoint(dir, u.mounter, true) /* extensiveMountPointCheck = true */

			// Assert
			if len(rcInstance.volumesFailedReconstruction) != 0 {
				t.Errorf("Expected volumesFailedReconstruction to be empty, got %+v", rcInstance.volumesFailedReconstruction)
			}
			// Unmount runs in a go routine, wait for its finish
			var lastErr error
			err = retryWithExponentialBackOff(testOperationBackOffDuration, func() (bool, error) {

	// In particular, the Unmount method uses spec.Name() as the volumeSpecName
	// in the mount path:
	// /var/lib/kubelet/pods/{podUID}/volumes/{escapeQualifiedPluginName}/{volumeSpecName}/
	spec *volume.Spec

	// pluginName is the Unescaped Qualified name of the volume plugin used to
	// attach and mount this volume. It is stored separately in case the full

	GetAttributes() Attributes
}

// Unmounter interface provides methods to cleanup/unmount the volumes.
type Unmounter interface {
	Volume
	// TearDown unmounts the volume from a self-determined directory and
	// 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

	}
	return err
}

type fcDiskUnmounter struct {
	*fcDisk
	mounter    mount.Interface
	deviceUtil util.DeviceUtil
	exec       utilexec.Interface
}

var _ volume.Unmounter = &fcDiskUnmounter{}

// Unmounts the bind mount, and detaches the disk only if the disk
// resource was the last reference to that disk on the kubelet.

		// TODO: extract from mount table in GetAttributes() to be sure?
		b.mountedWithSELinuxContext = mounterArgs.SELinuxLabel != ""
	}
	return err
}

type iscsiDiskUnmounter struct {
	*iscsiDisk
	mounter    mount.Interface
	exec       utilexec.Interface
	deviceUtil ioutil.DeviceUtil
}

var _ volume.Unmounter = &iscsiDiskUnmounter{}