allErrs = append(allErrs, field.Invalid(fldPath.Child("options").Key(k), k, "kubernetes.io and k8s.io namespaces are reserved"))
		}
	}

	return allErrs
}

func validateFlexPersistentVolumeSource(fv *core.FlexPersistentVolumeSource, fldPath *field.Path) field.ErrorList {
	allErrs := field.ErrorList{}
	if len(fv.Driver) == 0 {
		allErrs = append(allErrs, field.Required(fldPath.Child("driver"), ""))
	}