fix localvolume volume mode not found issue

pkg/volume/local/local.go

@@ -169,6 +169,7 @@ func (plugin *localVolumePlugin) NewBlockVolumeUnmapper(volName string,
 
 // TODO: check if no path and no topology constraints are ok
 func (plugin *localVolumePlugin) ConstructVolumeSpec(volumeName, mountPath string) (*volume.Spec, error) {
+	fs := v1.PersistentVolumeFilesystem
 	localVolume := &v1.PersistentVolume{
 		ObjectMeta: metav1.ObjectMeta{
 			Name: volumeName,
@@ -179,6 +180,7 @@ func (plugin *localVolumePlugin) ConstructVolumeSpec(volumeName, mountPath strin
 					Path: "",
 				},
 			},
+			VolumeMode: &fs,
 		},
 	}
 	return volume.NewSpecFromPersistentVolume(localVolume, false), nil

pkg/volume/local/local_test.go

@@ -336,6 +336,14 @@ func TestConstructVolumeSpec(t *testing.T) {
 		t.Fatalf("PersistentVolume object nil")
 	}
 
+	if spec.PersistentVolume.Spec.VolumeMode == nil {
+		t.Fatalf("Volume mode has not been set.")
+	}
+
+	if *spec.PersistentVolume.Spec.VolumeMode != v1.PersistentVolumeFilesystem {
+		t.Errorf("Unexpected volume mode %q", *spec.PersistentVolume.Spec.VolumeMode)
+	}
+
 	ls := pv.Spec.PersistentVolumeSource.Local
 	if ls == nil {
 		t.Fatalf("LocalVolumeSource object nil")