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Add create_geom and destroy_geom methods.
This commit is contained in:
Poul-Henning Kamp
parent
67ffbc63f3
commit
29c331bfaa
1 changed files with 159 additions and 0 deletions
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@ -118,6 +118,163 @@ g_bde_access(struct g_provider *pp, int dr, int dw, int de)
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return (g_access_rel(cp, dr, dw, de));
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}
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static int
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g_bde_create_geom(struct gctl_req *req, struct g_class *mp, struct g_provider *pp)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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struct g_bde_key *kp;
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int error, i;
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u_int sectorsize;
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off_t mediasize;
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struct g_bde_softc *sc;
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void *pass;
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void *key;
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if (pp == NULL)
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return (gctl_error(req, "Provider needed"));
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g_trace(G_T_TOPOLOGY, "g_bde_create_geom(%s, %s)", mp->name, pp->name);
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g_topology_assert();
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gp = NULL;
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pass = gctl_get_param(req, "pass", &i);
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if (pass == NULL || i != SHA512_DIGEST_LENGTH) {
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if (pass != NULL) {
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bzero(pass, i);
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g_free(pass);
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}
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return (gctl_error(req, "No usable key presented"));
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}
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key = gctl_get_param(req, "key", &i);
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if (key != NULL && i != 16) {
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bzero(key, i);
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bzero(pass, SHA512_DIGEST_LENGTH);
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g_free(pass);
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g_free(key);
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return (gctl_error(req, "Invalid key presented"));
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}
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gp = g_new_geomf(mp, "%s.bde", pp->name);
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gp->start = g_bde_start;
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gp->orphan = g_bde_orphan;
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gp->access = g_bde_access;
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gp->spoiled = g_std_spoiled;
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cp = g_new_consumer(gp);
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g_attach(cp, pp);
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error = g_access_rel(cp, 1, 1, 1);
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if (error) {
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g_detach(cp);
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g_destroy_consumer(cp);
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g_destroy_geom(gp);
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return (error);
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}
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g_topology_unlock();
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g_waitidle();
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while (1) {
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sectorsize = cp->provider->sectorsize;
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mediasize = cp->provider->mediasize;
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sc = g_malloc(sizeof(struct g_bde_softc), M_WAITOK | M_ZERO);
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gp->softc = sc;
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sc->geom = gp;
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sc->consumer = cp;
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error = g_bde_decrypt_lock(sc, pass, key,
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mediasize, sectorsize, NULL);
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bzero(pass, SHA512_DIGEST_LENGTH);
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if (key != NULL)
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bzero(key, 16);
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bzero(sc->sha2, sizeof sc->sha2);
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if (error)
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break;
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kp = &sc->key;
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/* Initialize helper-fields */
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kp->keys_per_sector = kp->sectorsize / G_BDE_SKEYLEN;
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kp->zone_cont = kp->keys_per_sector * kp->sectorsize;
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kp->zone_width = kp->zone_cont + kp->sectorsize;
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kp->media_width = kp->sectorN - kp->sector0 -
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G_BDE_MAXKEYS * kp->sectorsize;
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/* Our external parameters */
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sc->zone_cont = kp->zone_cont;
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sc->mediasize = g_bde_max_sector(kp);
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sc->sectorsize = kp->sectorsize;
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TAILQ_INIT(&sc->freelist);
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TAILQ_INIT(&sc->worklist);
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mtx_init(&sc->worklist_mutex, "g_bde_worklist", NULL, MTX_DEF);
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mtx_lock(&Giant);
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/* XXX: error check */
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kthread_create(g_bde_worker, gp, &sc->thread, 0, 0,
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"g_bde %s", gp->name);
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mtx_unlock(&Giant);
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g_topology_lock();
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pp = g_new_providerf(gp, gp->name);
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pp->flags |= G_PF_CANDELETE;
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pp->stripesize = kp->zone_cont;
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pp->stripeoffset = 0;
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pp->mediasize = sc->mediasize;
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pp->sectorsize = sc->sectorsize;
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g_error_provider(pp, 0);
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g_topology_unlock();
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break;
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}
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g_topology_lock();
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if (error == 0) {
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return (0);
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} else {
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g_access_rel(cp, -1, -1, -1);
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}
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g_detach(cp);
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g_destroy_consumer(cp);
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if (gp->softc != NULL)
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g_free(gp->softc);
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g_destroy_geom(gp);
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return (error);
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}
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static int
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g_bde_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
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{
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struct g_consumer *cp;
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struct g_provider *pp;
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int error;
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struct g_bde_softc *sc;
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g_trace(G_T_TOPOLOGY, "g_bde_destroy_geom(%s, %s)", mp->name, gp->name);
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g_topology_assert();
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/*
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* Orderly detachment.
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*/
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KASSERT(gp != NULL, ("NULL geom"));
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pp = LIST_FIRST(&gp->provider);
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KASSERT(pp != NULL, ("NULL provider"));
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if (pp->acr > 0 || pp->acw > 0 || pp->ace > 0)
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return (EBUSY);
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g_orphan_provider(pp, ENXIO);
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sc = gp->softc;
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cp = LIST_FIRST(&gp->consumer);
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KASSERT(cp != NULL, ("NULL consumer"));
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sc->dead = 1;
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wakeup(sc);
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error = g_access_rel(cp, -1, -1, -1);
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KASSERT(error == 0, ("error on close"));
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g_detach(cp);
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g_destroy_consumer(cp);
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g_topology_unlock();
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while (sc->dead != 2 && !LIST_EMPTY(&pp->consumers))
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tsleep(sc, PRIBIO, "g_bdedie", hz);
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g_waitidle();
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g_topology_lock();
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g_destroy_provider(pp);
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mtx_destroy(&sc->worklist_mutex);
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bzero(&sc->key, sizeof sc->key);
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g_free(sc);
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g_destroy_geom(gp);
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return (0);
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}
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static int
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g_bde_config(struct g_configargs *ga)
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{
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@ -273,6 +430,8 @@ g_bde_config(struct g_configargs *ga)
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static struct g_class g_bde_class = {
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.name = BDE_CLASS_NAME,
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.config = g_bde_config,
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.create_geom = g_bde_create_geom,
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.destroy_geom = g_bde_destroy_geom,
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G_CLASS_INITIALIZER
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};
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