exp_get_by_name
struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
exp = exp_get_by_name(cd, clp, path, NULL);
exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);