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)
			}
		})
	}
}

	err = dm.MountDevice(pvSpec, tmpBlockDir, expectedGlobalPath, volume.DeviceMounterArgs{})
	if err != nil {
		t.Fatal(err)
	}
	if _, err := os.Stat(actualPath); err != nil {
		if os.IsNotExist(err) {
			t.Errorf("DeviceMounter.MountDevice() failed, device mount path not created: %s", actualPath)
		} else {
			t.Errorf("DeviceMounter.MountDevice() failed: %v", err)
		}
	}

 - operation_executor.UnmountVolume
   - csi.GetPodDeviceMapPath
   - util.UnmapBlockVolume
   - csi.UnmapPodDevice
     - NodeUnpublishVolume
   - ASW.MarkVolumeAsUnmounted

 - operation_executor.UnmountDevice
   - csi.TearDownDevice
     - NodeUnstageVolume
   - ASW.MarkDeviceAsUnmounted

After successful MountVolume for block volume, directory structure will be like below:

	mounter := plugin.host.GetMounter(plugin.GetPluginName())
	return mounter.GetMountRefs(deviceMountPath)
}

var _ volume.DeviceUnmounter = &deviceMounter{}

func (dm *deviceMounter) UnmountDevice(deviceMountPath string) error {
	// If the local PV is a block device,
	// The deviceMountPath is generated to the format like :/var/lib/kubelet/plugins/kubernetes.io/local-volume/mounts/localpv.spec.Name;

		// pod B with context beta_t is already scheduled on the same node,
		// using the same volumes
		// The volumes from Pod A must be fully unmounted (incl. UnmountDevice)
		// and mounted with new SELinux mount options for pod B.
		// Without SELinux, kubelet can (and often does) reuse device mounted
		// for A.
		return vol.effectiveSELinuxMountFileLabel == seLinuxMountContext
	}

			}
			// Clear out the client if specified
			// The lookup to generate a new client will fail
			if tc.unsetClient {
				csiAttacher.csiClient = nil
			}

			// Run
			err := csiAttacher.UnmountDevice(tc.deviceMountPath)
			// Verify
			if err != nil {
				if !tc.shouldFail {
					t.Errorf("test should not fail, but error occurred: %v", err)
				}

	// TimeoutOnMountDeviceVolumeName will cause MountDevice call to timeout but Setup will finish.
	TimeoutOnMountDeviceVolumeName = "timeout-mount-device-volume"
	// TimeoutAndFailOnMountDeviceVolumeName will cause first MountDevice call to timeout but second call will fail
	TimeoutAndFailOnMountDeviceVolumeName = "timeout-and-fail-mount-device-name"
	// FailMountDeviceVolumeName will cause MountDevice operation on volume to fail

* GCE PD volume plugin now supports block volumes. ([#58710](https://github.com/kubernetes/kubernetes/pull/58710), [@screeley44](https://github.com/screeley44))

* Implements MountDevice and UnmountDevice for the CSI Plugin, the functions will call through to NodeStageVolume/NodeUnstageVolume for CSI plugins. ([#60115](https://github.com/kubernetes/kubernetes/pull/60115), [@davidz627](https://github.com/davidz627))

			expectMount: true,
			volumeMode:  v1.PersistentVolumeFilesystem,
		},
		{
			name: "reconstructed volume fails to mount",
			// FailOnSetupVolumeName: MountDevice succeeds, SetUp fails
			volumePath:  filepath.Join("pod1uid", "volumes", "fake-plugin", volumetesting.FailOnSetupVolumeName),
			expectMount: false,
			volumeMode:  v1.PersistentVolumeFilesystem,
		},
		{

* Apply _netdev mount option on bind mount ([#68626](https://github.com/kubernetes/kubernetes/pull/68626), [@gnufied](https://github.com/gnufied))
* fix UnmountDevice failure on Windows ([#68608](https://github.com/kubernetes/kubernetes/pull/68608), [@andyzhangx](https://github.com/andyzhangx))