Call NodeUnstage after NodeStage timeout

When NodeStage times out and does not prepare destination device and user
deletes corresponding pod, the driver may continue staging the volume in
background. Kubernetes must call NodeUnstage to "cancel" this operation.

Therefore TearDownDevice should be called even when the target directory
does not exist (yet).

pkg/volume/util/operationexecutor/operation_generator.go

@@ -20,6 +20,7 @@ import (
 	"context"
 	goerrors "errors"
 	"fmt"
+	"os"
 	"path/filepath"
 	"strings"
 	"time"
@@ -1202,7 +1203,12 @@ func (og *operationGenerator) GenerateUnmapDeviceFunc(
 		globalMapPath := deviceToDetach.DeviceMountPath
 		refs, err := og.blkUtil.GetDeviceBindMountRefs(deviceToDetach.DevicePath, globalMapPath)
 		if err != nil {
-			return deviceToDetach.GenerateError("UnmapDevice.GetDeviceBindMountRefs check failed", err)
+			if os.IsNotExist(err) {
+				// Looks like SetupDevice did not complete. Fall through to TearDownDevice and mark the device as unmounted.
+				refs = nil
+			} else {
+				return deviceToDetach.GenerateError("UnmapDevice.GetDeviceBindMountRefs check failed", err)
+			}
 		}
 		if len(refs) > 0 {
 			err = fmt.Errorf("The device %q is still referenced from other Pods %v", globalMapPath, refs)

pkg/volume/util/volumepathhandler/volume_path_handler.go

@@ -283,7 +283,7 @@ func (v VolumePathHandler) GetDeviceBindMountRefs(devPath string, mapPath string
 	var refs []string
 	files, err := ioutil.ReadDir(mapPath)
 	if err != nil {
-		return nil, fmt.Errorf("directory cannot read %v", err)
+		return nil, err
 	}
 	for _, file := range files {
 		if file.Mode()&os.ModeDevice != os.ModeDevice {