g_eli_create
gp = g_eli_create(NULL, mp, pp, &md, mkey, nkey);
struct g_geom *g_eli_create(struct gctl_req *req, struct g_class *mp,
g_eli_create(req, mp, pp, &md, mkey, nkey);
g_eli_create(req, mp, pp, &md, mkey, -1);