newPVC := obj.(*api.PersistentVolumeClaim)
	oldPVC := old.(*api.PersistentVolumeClaim)
	newPVC.Spec = oldPVC.Spec
	pvcutil.DropDisabledFieldsFromStatus(newPVC, oldPVC)
}

func (persistentvolumeclaimStatusStrategy) ValidateUpdate(ctx context.Context, obj, old runtime.Object) field.ErrorList {
	newPvc := obj.(*api.PersistentVolumeClaim)

	// All other values are silently dropped.
	if !dataSourceIsPvcOrSnapshot(pvcSpec.DataSource) {
		pvcSpec.DataSource = nil
	}
}

func DropDisabledFieldsFromStatus(pvc, oldPVC *core.PersistentVolumeClaim) {
	if !utilfeature.DefaultFeatureGate.Enabled(features.VolumeAttributesClass) {
		if oldPVC == nil || oldPVC.Status.CurrentVolumeAttributesClassName == nil {

			featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.VolumeAttributesClass, test.enableVolumeAttributesClass)

			DropDisabledFieldsFromStatus(test.pvc, test.oldPVC)

			if !reflect.DeepEqual(*test.expected, *test.pvc) {
				t.Errorf("Unexpected change: %+v", cmp.Diff(test.expected, test.pvc))
			}
		})
	}
}