// means that this volume does not belong to any StorageClass.
  // +optional
  optional string storageClassName = 6;

  // mountOptions is the list of mount options, e.g. ["ro", "soft"]. Not validated - mount will
  // simply fail if one is invalid.
  // More info: https://kubernetes.io/docs/concepts/storage/persistent-volumes/#mount-options
  // +optional
  repeated string mountOptions = 7;