stageUnstageSet, err := csi.NodeSupportsStageUnstage(ctx)
	if err != nil {
		return errors.New(log("attacher.UnmountDevice failed to check whether STAGE_UNSTAGE_VOLUME set: %v", err))
	}
	if !stageUnstageSet {
		klog.Infof(log("attacher.UnmountDevice STAGE_UNSTAGE_VOLUME capability not set. Skipping UnmountDevice..."))
		// Just	delete the global directory + json file
		if err := removeMountDir(c.plugin, deviceMountPath); err != nil {

				klog.V(5).InfoS(attachedVolume.GenerateMsgDetailed("Starting operationExecutor.UnmountDevice", ""))
				err := rc.operationExecutor.UnmountDevice(
					attachedVolume.AttachedVolume, rc.actualStateOfWorld, rc.hostutil)
				if err != nil && !isExpectedError(err) {
					klog.ErrorS(err, attachedVolume.GenerateErrorDetailed(fmt.Sprintf("operationExecutor.UnmountDevice failed (controllerAttachDetachEnabled %v)", rc.controllerAttachDetachEnabled), err).Error())

	return plugin.NewDetacher()
}

func (detacher *fcDetacher) Detach(volumeName string, nodeName types.NodeName) error {
	return nil
}

func (detacher *fcDetacher) UnmountDevice(deviceMountPath string) error {
	// Specify device name for DetachDisk later
	devName, _, err := mount.GetDeviceNameFromMount(detacher.mounter, deviceMountPath)
	if err != nil {

				// There is nothing else we can do. Hope that UnmountDevice will be re-tried shortly.
				klog.Errorf(deviceToDetach.GenerateErrorDetailed("UnmountDevice.MarkDeviceAsUncertain failed", markDeviceUncertainErr).Error())
			}

			// On failure, return error. Caller will log and retry.
			eventErr, detailedErr := deviceToDetach.GenerateError("UnmountDevice failed", unmountDeviceErr)

						t.Fatalf("csiTest.VolumeAll deviceMounter.GetdeviceMountPath failed %s", err)
					}
					if err := csiDevUnmounter.UnmountDevice(devMountPath); err != nil {
						t.Fatalf("csiTest.VolumeAll deviceMounter.UnmountDevice failed: %s", err)
					}
					t.Log("csiTest.VolumeAll deviceUnmounter.UnmountDevice done OK for path", devMountPath)
				}
			} else {

	return plugin.NewDetacher()
}

func (detacher *iscsiDetacher) Detach(volumeName string, nodeName types.NodeName) error {
	return nil
}

func (detacher *iscsiDetacher) UnmountDevice(deviceMountPath string) error {
	unMounter := volumeSpecToUnmounter(detacher.mounter, detacher.host, detacher.plugin)
	err := detacher.manager.DetachDisk(*unMounter, deviceMountPath)
	if err != nil {

}

// DeviceUnmounter can unmount a block volume from the global path.
type DeviceUnmounter interface {
	// UnmountDevice unmounts the global mount of the disk. This
	// should only be called once all bind mounts have been
	// unmounted.
	UnmountDevice(deviceMountPath string) error

	pdName := "pd-volume"

	// Act
	for i := range attachedVolumes {
		attachedVolumes[i] = AttachedVolume{
			VolumeName: v1.UniqueVolumeName(pdName),
			NodeName:   "node-name",
		}
		oe.UnmountDevice(attachedVolumes[i], nil /* actualStateOfWorldMounterUpdater */, nil /* mount.Interface */)
	}

	// Assert
	if !isOperationRunSerially(ch, quit) {
		t.Fatalf("Unmount device operations should not start concurrently")

	UnmountVolume(volumeToUnmount MountedVolume, actualStateOfWorld ActualStateOfWorldMounterUpdater, podsDir string) error

	// If a volume has 'Filesystem' volumeMode, UnmountDevice unmounts the
	// volumes global mount path from the device (for attachable volumes only,
	// freeing it for detach. It then updates the actual state of the world to
	// reflect that.
	//

			deviceToDetach := operationexecutor.AttachedVolume{VolumeSpec: tmpSpec, PluginName: "fake-file-plugin"}
			err := oex.UnmountDevice(deviceToDetach, asw, hostutil)
			// Assert
			if assert.Error(t, err) {
				assert.Contains(t, err.Error(), tc.expectedErrMsg)
			}
		})
	}
}