// +optional
  optional bool readOnly = 4;

  // wwids Optional: FC volume world wide identifiers (wwids)
  // Either wwids or combination of targetWWNs and lun must be set, but not both simultaneously.
  // +optional
  repeated string wwids = 5;
}

// FlexPersistentVolumeSource represents a generic persistent volume resource that is
// provisioned/attached using an exec based plugin.