func addKnownTypes(scheme *runtime.Scheme) error {
	scheme.AddKnownTypes(SchemeGroupVersion,
		&VolumeAttachment{},
		&VolumeAttachmentList{},
		&CSIStorageCapacity{},
		&CSIStorageCapacityList{},
		&VolumeAttributesClass{},
		&VolumeAttributesClassList{},
	)

	metav1.AddToGroupVersion(scheme, SchemeGroupVersion)
	return nil

		&StorageClassList{},
		&VolumeAttachment{},
		&VolumeAttachmentList{},
		&CSINode{},
		&CSINodeList{},
		&CSIDriver{},
		&CSIDriverList{},
		&CSIStorageCapacity{},
		&CSIStorageCapacityList{},
		&VolumeAttributesClass{},
		&VolumeAttributesClassList{},
	)
	return nil

// AlphaIsDefaultVolumeAttributesClassAnnotation is the alpha version of IsDefaultVolumeAttributesClassAnnotation.
const AlphaIsDefaultVolumeAttributesClassAnnotation = "volumeattributesclass.alpha.kubernetes.io/is-default-class"

// IsDefaultAnnotation returns a boolean if
// the annotation is set
// TODO: remove Beta when no longer needed
func IsDefaultAnnotation(obj metav1.ObjectMeta) bool {

	storage := map[string]rest.Storage{}

	// register volumeattributesclasses
	if resource := "volumeattributesclasses"; apiResourceConfigSource.ResourceEnabled(storageapiv1alpha1.SchemeGroupVersion.WithResource(resource)) {
		volumeAttributesClassStorage, err := volumeattributesclassstore.NewREST(restOptionsGetter)

func DropDisabledSpecFields(pvSpec *api.PersistentVolumeSpec, oldPVSpec *api.PersistentVolumeSpec) {
	if !utilfeature.DefaultFeatureGate.Enabled(features.VolumeAttributesClass) {
		if oldPVSpec == nil || oldPVSpec.VolumeAttributesClassName == nil {
			pvSpec.VolumeAttributesClassName = nil
		}
	}
}

// DropDisabledStatusFields removes disabled fields from the pv status.

			expectOldSpec: specWithVACName(nil),
		},
	}

	for name, tc := range tests {
		t.Run(name, func(t *testing.T) {
			featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.VolumeAttributesClass, tc.vacEnabled)

			DropDisabledSpecFields(tc.newSpec, tc.oldSpec)
			if !reflect.DeepEqual(tc.newSpec, tc.expectNewSpec) {
				t.Error(cmp.Diff(tc.newSpec, tc.expectNewSpec))
			}

		networking.Resource("ipaddresses").WithVersion("v1alpha1"),
		networking.Resource("servicecidrs").WithVersion("v1alpha1"),
		certificates.Resource("clustertrustbundles").WithVersion("v1alpha1"),
		storage.Resource("volumeattributesclasses").WithVersion("v1alpha1"),
		storagemigration.Resource("storagemigrations").WithVersion("v1alpha1"),
	}

	return &StorageFactoryConfig{
		Serializer:                legacyscheme.Codecs,