3f12caa180
don't take the detour over the I/O path to discover them using getattr(), we can just pick them out directly. Do note though, that for now they are only valid after the first open of the underlying disk device due compatibility with the old disk_create() API. This will change in the future so they will always be valid. Sponsored by: DARPA & NAI Labs.
277 lines
7.1 KiB
C
277 lines
7.1 KiB
C
/*-
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* Copyright (c) 2002 Poul-Henning Kamp
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Poul-Henning Kamp
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* and NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#include <sys/param.h>
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#include <sys/stdint.h>
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#include <sys/bio.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/malloc.h>
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#include <geom/geom.h>
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#include <geom/bde/g_bde.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#define BDE_CLASS_NAME "BDE"
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static void
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g_bde_start(struct bio *bp)
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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_softc *sc;
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gp = bp->bio_to->geom;
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cp = LIST_FIRST(&gp->consumer);
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sc = gp->softc;
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switch (bp->bio_cmd) {
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case BIO_DELETE:
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case BIO_READ:
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case BIO_WRITE:
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g_bde_start1(bp);
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break;
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case BIO_GETATTR:
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case BIO_SETATTR:
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g_io_deliver(bp, EOPNOTSUPP);
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break;
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default:
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g_io_deliver(bp, EOPNOTSUPP);
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return;
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}
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return;
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}
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static void
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g_bde_orphan(struct g_consumer *cp)
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{
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struct g_geom *gp;
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struct g_provider *pp;
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struct g_bde_softc *sc;
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int error;
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g_trace(G_T_TOPOLOGY, "g_bde_orphan(%p/%s)", cp, cp->provider->name);
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g_topology_assert();
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KASSERT(cp->provider->error != 0,
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("g_bde_orphan with error == 0"));
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gp = cp->geom;
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sc = gp->softc;
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gp->flags |= G_GEOM_WITHER;
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error = cp->provider->error;
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LIST_FOREACH(pp, &gp->provider, provider)
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g_orphan_provider(pp, error);
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bzero(sc, sizeof(struct g_bde_softc)); /* destroy evidence */
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return;
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}
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static int
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g_bde_access(struct g_provider *pp, int dr, int dw, int de)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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gp = pp->geom;
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cp = LIST_FIRST(&gp->consumer);
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if (cp->acr == 0 && cp->acw == 0 && cp->ace == 0) {
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de++;
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dr++;
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}
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/* ... and let go of it on last close */
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if ((cp->acr + dr) == 0 && (cp->acw + dw) == 0 && (cp->ace + de) == 1) {
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de--;
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dr--;
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}
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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(struct g_createargs *ga)
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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_provider *pp;
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struct g_bde_key *kp;
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int error;
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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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g_trace(G_T_TOPOLOGY, "g_bde_create(%d)", ga->flag);
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g_topology_assert();
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gp = NULL;
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if (ga->flag == 1) {
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/*
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* Orderly dettachment.
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*/
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if (ga->geom != NULL) {
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gp = ga->geom;
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} else if (ga->provider != NULL) {
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if (ga->provider->geom->class == ga->class) {
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gp = ga->provider->geom;
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} else {
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LIST_FOREACH(cp, &ga->provider->consumers,
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consumers) {
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if (cp->geom->class == ga->class) {
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gp = cp->geom;
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break;
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}
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}
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}
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if (gp == NULL)
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return (EINVAL);
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} else {
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return (EINVAL);
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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_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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if (ga->flag != 0)
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return (EOPNOTSUPP);
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if (ga->provider == NULL)
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return (EINVAL);
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/*
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* Attach
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*/
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gp = g_new_geomf(ga->class, "%s.bde", ga->provider->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, ga->provider);
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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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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, ga->ptr,
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(u_char *)ga->ptr + 256, mediasize, sectorsize, NULL);
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bzero(sc->arc4_sbox, sizeof sc->arc4_sbox);
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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->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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ga->geom = gp;
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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 struct g_class g_bde_class = {
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BDE_CLASS_NAME,
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NULL,
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g_bde_create,
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G_CLASS_INITIALIZER
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};
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DECLARE_GEOM_CLASS(g_bde_class, g_bde);
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