g_mirror_add_disk
error = g_mirror_add_disk(sc, pp, &md);
int g_mirror_add_disk(struct g_mirror_softc *sc, struct g_provider *pp,
if (g_mirror_add_disk(sc, pp, &md) != 0) {
error = g_mirror_add_disk(sc, pp, &md);
if (g_mirror_add_disk(sc, pp, &md) != 0) {