code: func (storageClassStrategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
  	newClass := obj.(*storage.StorageClass)
  	oldClass := old.(*storage.StorageClass)
  
  	storageutil.DropDisabledFields(oldClass, newClass)
  }
docs: // PrepareForUpdate sets the Status fields which is not allowed to be set by an end user updating a PV