// sensitive information to pass to the CSI driver to complete the CSI
  // ControllerExpandVolume call.
  // This field is optional, and may be empty if no secret is required. If the
  // secret object contains more than one secret, all secrets are passed.
  // +optional
  optional SecretReference controllerExpandSecretRef = 9;

  // nodeExpandSecretRef is a reference to the secret object containing