From 29c331bfaacacee69d3ab8a74d525dfb2dfe352a Mon Sep 17 00:00:00 2001
From: Poul-Henning Kamp <phk@FreeBSD.org>
Date: Sat, 29 Mar 2003 22:14:21 +0000
Subject: Add create_geom and destroy_geom methods.

---
 sys/geom/bde/g_bde.c | 159 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 159 insertions(+)

diff --git a/sys/geom/bde/g_bde.c b/sys/geom/bde/g_bde.c
index 6ab96a202c65..850cf1e63f51 100644
--- a/sys/geom/bde/g_bde.c
+++ b/sys/geom/bde/g_bde.c
@@ -118,6 +118,163 @@ g_bde_access(struct g_provider *pp, int dr, int dw, int de)
 	return (g_access_rel(cp, dr, dw, de));
 }
 
+static int
+g_bde_create_geom(struct gctl_req *req, struct g_class *mp, struct g_provider *pp)
+{
+	struct g_geom *gp;
+	struct g_consumer *cp;
+	struct g_bde_key *kp;
+	int error, i;
+	u_int sectorsize;
+	off_t mediasize;
+	struct g_bde_softc *sc;
+	void *pass;
+	void *key;
+
+	if (pp == NULL)
+		return (gctl_error(req, "Provider needed"));
+	g_trace(G_T_TOPOLOGY, "g_bde_create_geom(%s, %s)", mp->name, pp->name);
+	g_topology_assert();
+	gp = NULL;
+
+	pass = gctl_get_param(req, "pass", &i);
+	if (pass == NULL || i != SHA512_DIGEST_LENGTH) {
+		if (pass != NULL) {
+			bzero(pass, i);
+			g_free(pass);
+		}
+		return (gctl_error(req, "No usable key presented"));
+	}
+	key = gctl_get_param(req, "key", &i);
+	if (key != NULL && i != 16) {
+		bzero(key, i);
+		bzero(pass, SHA512_DIGEST_LENGTH);
+		g_free(pass);
+		g_free(key);
+		return (gctl_error(req, "Invalid key presented"));
+	}
+
+	gp = g_new_geomf(mp, "%s.bde", pp->name);
+	gp->start = g_bde_start;
+	gp->orphan = g_bde_orphan;
+	gp->access = g_bde_access;
+	gp->spoiled = g_std_spoiled;
+	cp = g_new_consumer(gp);
+	g_attach(cp, pp);
+	error = g_access_rel(cp, 1, 1, 1);
+	if (error) {
+		g_detach(cp);
+		g_destroy_consumer(cp);
+		g_destroy_geom(gp);
+		return (error);
+	}
+	g_topology_unlock();
+	g_waitidle();
+	while (1) {
+		sectorsize = cp->provider->sectorsize;
+		mediasize = cp->provider->mediasize;
+		sc = g_malloc(sizeof(struct g_bde_softc), M_WAITOK | M_ZERO);
+		gp->softc = sc;
+		sc->geom = gp;
+		sc->consumer = cp;
+
+		error = g_bde_decrypt_lock(sc, pass, key,
+		    mediasize, sectorsize, NULL);
+		bzero(pass, SHA512_DIGEST_LENGTH);
+		if (key != NULL)
+			bzero(key, 16);
+		bzero(sc->sha2, sizeof sc->sha2);
+		if (error)
+			break;
+		kp = &sc->key;
+
+		/* Initialize helper-fields */
+		kp->keys_per_sector = kp->sectorsize / G_BDE_SKEYLEN;
+		kp->zone_cont = kp->keys_per_sector * kp->sectorsize;
+		kp->zone_width = kp->zone_cont + kp->sectorsize;
+		kp->media_width = kp->sectorN - kp->sector0 -
+		    G_BDE_MAXKEYS * kp->sectorsize;
+
+		/* Our external parameters */
+		sc->zone_cont = kp->zone_cont;
+		sc->mediasize = g_bde_max_sector(kp);
+		sc->sectorsize = kp->sectorsize;
+
+		TAILQ_INIT(&sc->freelist);
+		TAILQ_INIT(&sc->worklist);
+		mtx_init(&sc->worklist_mutex, "g_bde_worklist", NULL, MTX_DEF);
+		mtx_lock(&Giant);
+		/* XXX: error check */
+		kthread_create(g_bde_worker, gp, &sc->thread, 0, 0,
+			"g_bde %s", gp->name);
+		mtx_unlock(&Giant);
+		g_topology_lock();
+		pp = g_new_providerf(gp, gp->name);
+		pp->flags |= G_PF_CANDELETE;
+		pp->stripesize = kp->zone_cont;
+		pp->stripeoffset = 0;
+		pp->mediasize = sc->mediasize;
+		pp->sectorsize = sc->sectorsize;
+		g_error_provider(pp, 0);
+		g_topology_unlock();
+		break;
+	}
+	g_topology_lock();
+	if (error == 0) {
+		return (0);
+	} else {
+		g_access_rel(cp, -1, -1, -1);
+	}
+	g_detach(cp);
+	g_destroy_consumer(cp);
+	if (gp->softc != NULL)
+		g_free(gp->softc);
+	g_destroy_geom(gp);
+	return (error);
+}
+
+
+static int
+g_bde_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
+{
+	struct g_consumer *cp;
+	struct g_provider *pp;
+	int error;
+	struct g_bde_softc *sc;
+
+	g_trace(G_T_TOPOLOGY, "g_bde_destroy_geom(%s, %s)", mp->name, gp->name);
+	g_topology_assert();
+	/*
+	 * Orderly detachment.
+	 */
+	KASSERT(gp != NULL, ("NULL geom"));
+	pp = LIST_FIRST(&gp->provider);
+	KASSERT(pp != NULL, ("NULL provider"));
+	if (pp->acr > 0 || pp->acw > 0 || pp->ace > 0)
+		return (EBUSY);
+	g_orphan_provider(pp, ENXIO);
+	sc = gp->softc;
+	cp = LIST_FIRST(&gp->consumer);
+	KASSERT(cp != NULL, ("NULL consumer"));
+	sc->dead = 1;
+	wakeup(sc);
+	error = g_access_rel(cp, -1, -1, -1);
+	KASSERT(error == 0, ("error on close"));
+	g_detach(cp);
+	g_destroy_consumer(cp);
+	g_topology_unlock();
+	while (sc->dead != 2 && !LIST_EMPTY(&pp->consumers))
+		tsleep(sc, PRIBIO, "g_bdedie", hz);
+	g_waitidle();
+	g_topology_lock();
+	g_destroy_provider(pp);
+	mtx_destroy(&sc->worklist_mutex);
+	bzero(&sc->key, sizeof sc->key);
+	g_free(sc);
+	g_destroy_geom(gp);
+	return (0);
+}
+
 static int
 g_bde_config(struct g_configargs *ga)
 {
@@ -273,6 +430,8 @@ g_bde_config(struct g_configargs *ga)
 static struct g_class g_bde_class	= {
 	.name = BDE_CLASS_NAME,
 	.config = g_bde_config,
+	.create_geom = g_bde_create_geom,
+	.destroy_geom = g_bde_destroy_geom,
 	G_CLASS_INITIALIZER
 };
 
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