def _opres_common(self, err, resp):
     res = OperationResult()
     res.cas = resp.v.v0.cas
     res.rc = err
     self._add_response(resp, res)
     return res
 def _unlock_callback(self, instance, cookie, err, resp):
     res = OperationResult()
     res.rc = err
     self._add_response(resp, res)