return nil
	}

	pvc, ok := attr.GetObject().(*api.PersistentVolumeClaim)
	// if we can't convert then we don't handle this object so just return
	if !ok {
		return nil
	}

	if helper.PersistentVolumeClaimHasClass(pvc) {
		// The user asked for a class.
		return nil
	}

	klog.V(4).Infof("no storage class for claim %s (generate: %s)", pvc.Name, pvc.GenerateName)

	def, err := util.GetDefaultClass(a.lister)

		return class
	}

	if claim.Spec.StorageClassName != nil {
		return *claim.Spec.StorageClassName
	}

	return ""
}

// PersistentVolumeClaimHasClass returns true if given claim has set StorageClassName field.
func PersistentVolumeClaimHasClass(claim *core.PersistentVolumeClaim) bool {
	// Use beta annotation first
	if _, found := claim.Annotations[core.BetaStorageClassAnnotation]; found {
		return true
	}

func (ctrl *PersistentVolumeController) assignDefaultStorageClass(ctx context.Context, claim *v1.PersistentVolumeClaim) (bool, error) {
	logger := klog.FromContext(ctx)

	if storagehelpers.PersistentVolumeClaimHasClass(claim) {
		// The user asked for a class.
		return false, nil
	}

	class, err := util.GetDefaultClass(ctrl.classLister)
	if err != nil {
		return false, err
	} else if class == nil {