AFS_SERVER_FL_IS_YFS
if (test_bit(AFS_SERVER_FL_IS_YFS, &op->server->flags))
if (test_bit(AFS_SERVER_FL_IS_YFS, &op->server->flags) &&
set_bit(AFS_SERVER_FL_IS_YFS, &server->flags);
clear_bit(AFS_SERVER_FL_IS_YFS, &server->flags);