The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/geom/shsec/g_shsec.c

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    1 /*-
    2  * Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/10.3/sys/geom/shsec/g_shsec.c 227309 2011-11-07 15:43:11Z ed $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kernel.h>
   33 #include <sys/module.h>
   34 #include <sys/lock.h>
   35 #include <sys/mutex.h>
   36 #include <sys/bio.h>
   37 #include <sys/sbuf.h>
   38 #include <sys/sysctl.h>
   39 #include <sys/malloc.h>
   40 #include <vm/uma.h>
   41 #include <geom/geom.h>
   42 #include <geom/shsec/g_shsec.h>
   43 
   44 FEATURE(geom_shsec, "GEOM shared secret device support");
   45 
   46 static MALLOC_DEFINE(M_SHSEC, "shsec_data", "GEOM_SHSEC Data");
   47 
   48 static uma_zone_t g_shsec_zone;
   49 
   50 static int g_shsec_destroy(struct g_shsec_softc *sc, boolean_t force);
   51 static int g_shsec_destroy_geom(struct gctl_req *req, struct g_class *mp,
   52     struct g_geom *gp);
   53 
   54 static g_taste_t g_shsec_taste;
   55 static g_ctl_req_t g_shsec_config;
   56 static g_dumpconf_t g_shsec_dumpconf;
   57 static g_init_t g_shsec_init;
   58 static g_fini_t g_shsec_fini;
   59 
   60 struct g_class g_shsec_class = {
   61         .name = G_SHSEC_CLASS_NAME,
   62         .version = G_VERSION,
   63         .ctlreq = g_shsec_config,
   64         .taste = g_shsec_taste,
   65         .destroy_geom = g_shsec_destroy_geom,
   66         .init = g_shsec_init,
   67         .fini = g_shsec_fini
   68 };
   69 
   70 SYSCTL_DECL(_kern_geom);
   71 static SYSCTL_NODE(_kern_geom, OID_AUTO, shsec, CTLFLAG_RW, 0,
   72     "GEOM_SHSEC stuff");
   73 static u_int g_shsec_debug = 0;
   74 TUNABLE_INT("kern.geom.shsec.debug", &g_shsec_debug);
   75 SYSCTL_UINT(_kern_geom_shsec, OID_AUTO, debug, CTLFLAG_RW, &g_shsec_debug, 0,
   76     "Debug level");
   77 static u_int g_shsec_maxmem = MAXPHYS * 100;
   78 TUNABLE_INT("kern.geom.shsec.maxmem", &g_shsec_maxmem);
   79 SYSCTL_UINT(_kern_geom_shsec, OID_AUTO, maxmem, CTLFLAG_RD, &g_shsec_maxmem,
   80     0, "Maximum memory that can be allocated for I/O (in bytes)");
   81 static u_int g_shsec_alloc_failed = 0;
   82 SYSCTL_UINT(_kern_geom_shsec, OID_AUTO, alloc_failed, CTLFLAG_RD,
   83     &g_shsec_alloc_failed, 0, "How many times I/O allocation failed");
   84 
   85 /*
   86  * Greatest Common Divisor.
   87  */
   88 static u_int
   89 gcd(u_int a, u_int b)
   90 {
   91         u_int c;
   92 
   93         while (b != 0) {
   94                 c = a;
   95                 a = b;
   96                 b = (c % b);
   97         }
   98         return (a);
   99 }
  100 
  101 /*
  102  * Least Common Multiple.
  103  */
  104 static u_int
  105 lcm(u_int a, u_int b)
  106 {
  107 
  108         return ((a * b) / gcd(a, b));
  109 }
  110 
  111 static void
  112 g_shsec_init(struct g_class *mp __unused)
  113 {
  114 
  115         g_shsec_zone = uma_zcreate("g_shsec_zone", MAXPHYS, NULL, NULL, NULL,
  116             NULL, 0, 0);
  117         g_shsec_maxmem -= g_shsec_maxmem % MAXPHYS;
  118         uma_zone_set_max(g_shsec_zone, g_shsec_maxmem / MAXPHYS);
  119 }
  120 
  121 static void
  122 g_shsec_fini(struct g_class *mp __unused)
  123 {
  124 
  125         uma_zdestroy(g_shsec_zone);
  126 }
  127 
  128 /*
  129  * Return the number of valid disks.
  130  */
  131 static u_int
  132 g_shsec_nvalid(struct g_shsec_softc *sc)
  133 {
  134         u_int i, no;
  135 
  136         no = 0;
  137         for (i = 0; i < sc->sc_ndisks; i++) {
  138                 if (sc->sc_disks[i] != NULL)
  139                         no++;
  140         }
  141 
  142         return (no);
  143 }
  144 
  145 static void
  146 g_shsec_remove_disk(struct g_consumer *cp)
  147 {
  148         struct g_shsec_softc *sc;
  149         u_int no;
  150 
  151         KASSERT(cp != NULL, ("Non-valid disk in %s.", __func__));
  152         sc = (struct g_shsec_softc *)cp->private;
  153         KASSERT(sc != NULL, ("NULL sc in %s.", __func__));
  154         no = cp->index;
  155 
  156         G_SHSEC_DEBUG(0, "Disk %s removed from %s.", cp->provider->name,
  157             sc->sc_name);
  158 
  159         sc->sc_disks[no] = NULL;
  160         if (sc->sc_provider != NULL) {
  161                 g_orphan_provider(sc->sc_provider, ENXIO);
  162                 sc->sc_provider = NULL;
  163                 G_SHSEC_DEBUG(0, "Device %s removed.", sc->sc_name);
  164         }
  165 
  166         if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
  167                 g_access(cp, -cp->acr, -cp->acw, -cp->ace);
  168         g_detach(cp);
  169         g_destroy_consumer(cp);
  170 }
  171 
  172 static void
  173 g_shsec_orphan(struct g_consumer *cp)
  174 {
  175         struct g_shsec_softc *sc;
  176         struct g_geom *gp;
  177 
  178         g_topology_assert();
  179         gp = cp->geom;
  180         sc = gp->softc;
  181         if (sc == NULL)
  182                 return;
  183 
  184         g_shsec_remove_disk(cp);
  185         /* If there are no valid disks anymore, remove device. */
  186         if (g_shsec_nvalid(sc) == 0)
  187                 g_shsec_destroy(sc, 1);
  188 }
  189 
  190 static int
  191 g_shsec_access(struct g_provider *pp, int dr, int dw, int de)
  192 {
  193         struct g_consumer *cp1, *cp2;
  194         struct g_shsec_softc *sc;
  195         struct g_geom *gp;
  196         int error;
  197 
  198         gp = pp->geom;
  199         sc = gp->softc;
  200 
  201         if (sc == NULL) {
  202                 /*
  203                  * It looks like geom is being withered.
  204                  * In that case we allow only negative requests.
  205                  */
  206                 KASSERT(dr <= 0 && dw <= 0 && de <= 0,
  207                     ("Positive access request (device=%s).", pp->name));
  208                 if ((pp->acr + dr) == 0 && (pp->acw + dw) == 0 &&
  209                     (pp->ace + de) == 0) {
  210                         G_SHSEC_DEBUG(0, "Device %s definitely destroyed.",
  211                             gp->name);
  212                 }
  213                 return (0);
  214         }
  215 
  216         /* On first open, grab an extra "exclusive" bit */
  217         if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)
  218                 de++;
  219         /* ... and let go of it on last close */
  220         if ((pp->acr + dr) == 0 && (pp->acw + dw) == 0 && (pp->ace + de) == 0)
  221                 de--;
  222 
  223         error = ENXIO;
  224         LIST_FOREACH(cp1, &gp->consumer, consumer) {
  225                 error = g_access(cp1, dr, dw, de);
  226                 if (error == 0)
  227                         continue;
  228                 /*
  229                  * If we fail here, backout all previous changes.
  230                  */
  231                 LIST_FOREACH(cp2, &gp->consumer, consumer) {
  232                         if (cp1 == cp2)
  233                                 return (error);
  234                         g_access(cp2, -dr, -dw, -de);
  235                 }
  236                 /* NOTREACHED */
  237         }
  238 
  239         return (error);
  240 }
  241 
  242 static void
  243 g_shsec_xor1(uint32_t *src, uint32_t *dst, ssize_t len)
  244 {
  245 
  246         for (; len > 0; len -= sizeof(uint32_t), dst++)
  247                 *dst = *dst ^ *src++;
  248         KASSERT(len == 0, ("len != 0 (len=%zd)", len));
  249 }
  250 
  251 static void
  252 g_shsec_done(struct bio *bp)
  253 {
  254         struct g_shsec_softc *sc;
  255         struct bio *pbp;
  256 
  257         pbp = bp->bio_parent;
  258         sc = pbp->bio_to->geom->softc;
  259         if (bp->bio_error == 0)
  260                 G_SHSEC_LOGREQ(2, bp, "Request done.");
  261         else {
  262                 G_SHSEC_LOGREQ(0, bp, "Request failed (error=%d).",
  263                     bp->bio_error);
  264                 if (pbp->bio_error == 0)
  265                         pbp->bio_error = bp->bio_error;
  266         }
  267         if (pbp->bio_cmd == BIO_READ) {
  268                 if ((pbp->bio_pflags & G_SHSEC_BFLAG_FIRST) != 0) {
  269                         bcopy(bp->bio_data, pbp->bio_data, pbp->bio_length);
  270                         pbp->bio_pflags = 0;
  271                 } else {
  272                         g_shsec_xor1((uint32_t *)bp->bio_data,
  273                             (uint32_t *)pbp->bio_data,
  274                             (ssize_t)pbp->bio_length);
  275                 }
  276         }
  277         bzero(bp->bio_data, bp->bio_length);
  278         uma_zfree(g_shsec_zone, bp->bio_data);
  279         g_destroy_bio(bp);
  280         pbp->bio_inbed++;
  281         if (pbp->bio_children == pbp->bio_inbed) {
  282                 pbp->bio_completed = pbp->bio_length;
  283                 g_io_deliver(pbp, pbp->bio_error);
  284         }
  285 }
  286 
  287 static void
  288 g_shsec_xor2(uint32_t *rand, uint32_t *dst, ssize_t len)
  289 {
  290 
  291         for (; len > 0; len -= sizeof(uint32_t), dst++) {
  292                 *rand = arc4random();
  293                 *dst = *dst ^ *rand++;
  294         }
  295         KASSERT(len == 0, ("len != 0 (len=%zd)", len));
  296 }
  297 
  298 static void
  299 g_shsec_start(struct bio *bp)
  300 {
  301         TAILQ_HEAD(, bio) queue = TAILQ_HEAD_INITIALIZER(queue);
  302         struct g_shsec_softc *sc;
  303         struct bio *cbp;
  304         uint32_t *dst;
  305         ssize_t len;
  306         u_int no;
  307         int error;
  308 
  309         sc = bp->bio_to->geom->softc;
  310         /*
  311          * If sc == NULL, provider's error should be set and g_shsec_start()
  312          * should not be called at all.
  313          */
  314         KASSERT(sc != NULL,
  315             ("Provider's error should be set (error=%d)(device=%s).",
  316             bp->bio_to->error, bp->bio_to->name));
  317 
  318         G_SHSEC_LOGREQ(2, bp, "Request received.");
  319 
  320         switch (bp->bio_cmd) {
  321         case BIO_READ:
  322         case BIO_WRITE:
  323         case BIO_FLUSH:
  324                 /*
  325                  * Only those requests are supported.
  326                  */
  327                 break;
  328         case BIO_DELETE:
  329         case BIO_GETATTR:
  330                 /* To which provider it should be delivered? */
  331         default:
  332                 g_io_deliver(bp, EOPNOTSUPP);
  333                 return;
  334         }
  335 
  336         /*
  337          * Allocate all bios first and calculate XOR.
  338          */
  339         dst = NULL;
  340         len = bp->bio_length;
  341         if (bp->bio_cmd == BIO_READ)
  342                 bp->bio_pflags = G_SHSEC_BFLAG_FIRST;
  343         for (no = 0; no < sc->sc_ndisks; no++) {
  344                 cbp = g_clone_bio(bp);
  345                 if (cbp == NULL) {
  346                         error = ENOMEM;
  347                         goto failure;
  348                 }
  349                 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue);
  350 
  351                 /*
  352                  * Fill in the component buf structure.
  353                  */
  354                 cbp->bio_done = g_shsec_done;
  355                 cbp->bio_data = uma_zalloc(g_shsec_zone, M_NOWAIT);
  356                 if (cbp->bio_data == NULL) {
  357                         g_shsec_alloc_failed++;
  358                         error = ENOMEM;
  359                         goto failure;
  360                 }
  361                 cbp->bio_caller2 = sc->sc_disks[no];
  362                 if (bp->bio_cmd == BIO_WRITE) {
  363                         if (no == 0) {
  364                                 dst = (uint32_t *)cbp->bio_data;
  365                                 bcopy(bp->bio_data, dst, len);
  366                         } else {
  367                                 g_shsec_xor2((uint32_t *)cbp->bio_data, dst,
  368                                     len);
  369                         }
  370                 }
  371         }
  372         /*
  373          * Fire off all allocated requests!
  374          */
  375         while ((cbp = TAILQ_FIRST(&queue)) != NULL) {
  376                 struct g_consumer *cp;
  377 
  378                 TAILQ_REMOVE(&queue, cbp, bio_queue);
  379                 cp = cbp->bio_caller2;
  380                 cbp->bio_caller2 = NULL;
  381                 cbp->bio_to = cp->provider;
  382                 G_SHSEC_LOGREQ(2, cbp, "Sending request.");
  383                 g_io_request(cbp, cp);
  384         }
  385         return;
  386 failure:
  387         while ((cbp = TAILQ_FIRST(&queue)) != NULL) {
  388                 TAILQ_REMOVE(&queue, cbp, bio_queue);
  389                 bp->bio_children--;
  390                 if (cbp->bio_data != NULL) {
  391                         bzero(cbp->bio_data, cbp->bio_length);
  392                         uma_zfree(g_shsec_zone, cbp->bio_data);
  393                 }
  394                 g_destroy_bio(cbp);
  395         }
  396         if (bp->bio_error == 0)
  397                 bp->bio_error = error;
  398         g_io_deliver(bp, bp->bio_error);
  399 }
  400 
  401 static void
  402 g_shsec_check_and_run(struct g_shsec_softc *sc)
  403 {
  404         off_t mediasize, ms;
  405         u_int no, sectorsize = 0;
  406 
  407         if (g_shsec_nvalid(sc) != sc->sc_ndisks)
  408                 return;
  409 
  410         sc->sc_provider = g_new_providerf(sc->sc_geom, "shsec/%s", sc->sc_name);
  411         /*
  412          * Find the smallest disk.
  413          */
  414         mediasize = sc->sc_disks[0]->provider->mediasize;
  415         mediasize -= sc->sc_disks[0]->provider->sectorsize;
  416         sectorsize = sc->sc_disks[0]->provider->sectorsize;
  417         for (no = 1; no < sc->sc_ndisks; no++) {
  418                 ms = sc->sc_disks[no]->provider->mediasize;
  419                 ms -= sc->sc_disks[no]->provider->sectorsize;
  420                 if (ms < mediasize)
  421                         mediasize = ms;
  422                 sectorsize = lcm(sectorsize,
  423                     sc->sc_disks[no]->provider->sectorsize);
  424         }
  425         sc->sc_provider->sectorsize = sectorsize;
  426         sc->sc_provider->mediasize = mediasize;
  427         g_error_provider(sc->sc_provider, 0);
  428 
  429         G_SHSEC_DEBUG(0, "Device %s activated.", sc->sc_name);
  430 }
  431 
  432 static int
  433 g_shsec_read_metadata(struct g_consumer *cp, struct g_shsec_metadata *md)
  434 {
  435         struct g_provider *pp;
  436         u_char *buf;
  437         int error;
  438 
  439         g_topology_assert();
  440 
  441         error = g_access(cp, 1, 0, 0);
  442         if (error != 0)
  443                 return (error);
  444         pp = cp->provider;
  445         g_topology_unlock();
  446         buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
  447             &error);
  448         g_topology_lock();
  449         g_access(cp, -1, 0, 0);
  450         if (buf == NULL)
  451                 return (error);
  452 
  453         /* Decode metadata. */
  454         shsec_metadata_decode(buf, md);
  455         g_free(buf);
  456 
  457         return (0);
  458 }
  459 
  460 /*
  461  * Add disk to given device.
  462  */
  463 static int
  464 g_shsec_add_disk(struct g_shsec_softc *sc, struct g_provider *pp, u_int no)
  465 {
  466         struct g_consumer *cp, *fcp;
  467         struct g_geom *gp;
  468         struct g_shsec_metadata md;
  469         int error;
  470 
  471         /* Metadata corrupted? */
  472         if (no >= sc->sc_ndisks)
  473                 return (EINVAL);
  474 
  475         /* Check if disk is not already attached. */
  476         if (sc->sc_disks[no] != NULL)
  477                 return (EEXIST);
  478 
  479         gp = sc->sc_geom;
  480         fcp = LIST_FIRST(&gp->consumer);
  481 
  482         cp = g_new_consumer(gp);
  483         error = g_attach(cp, pp);
  484         if (error != 0) {
  485                 g_destroy_consumer(cp);
  486                 return (error);
  487         }
  488 
  489         if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0)) {
  490                 error = g_access(cp, fcp->acr, fcp->acw, fcp->ace);
  491                 if (error != 0) {
  492                         g_detach(cp);
  493                         g_destroy_consumer(cp);
  494                         return (error);
  495                 }
  496         }
  497 
  498         /* Reread metadata. */
  499         error = g_shsec_read_metadata(cp, &md);
  500         if (error != 0)
  501                 goto fail;
  502 
  503         if (strcmp(md.md_magic, G_SHSEC_MAGIC) != 0 ||
  504             strcmp(md.md_name, sc->sc_name) != 0 || md.md_id != sc->sc_id) {
  505                 G_SHSEC_DEBUG(0, "Metadata on %s changed.", pp->name);
  506                 goto fail;
  507         }
  508 
  509         cp->private = sc;
  510         cp->index = no;
  511         sc->sc_disks[no] = cp;
  512 
  513         G_SHSEC_DEBUG(0, "Disk %s attached to %s.", pp->name, sc->sc_name);
  514 
  515         g_shsec_check_and_run(sc);
  516 
  517         return (0);
  518 fail:
  519         if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0))
  520                 g_access(cp, -fcp->acr, -fcp->acw, -fcp->ace);
  521         g_detach(cp);
  522         g_destroy_consumer(cp);
  523         return (error);
  524 }
  525 
  526 static struct g_geom *
  527 g_shsec_create(struct g_class *mp, const struct g_shsec_metadata *md)
  528 {
  529         struct g_shsec_softc *sc;
  530         struct g_geom *gp;
  531         u_int no;
  532 
  533         G_SHSEC_DEBUG(1, "Creating device %s (id=%u).", md->md_name, md->md_id);
  534 
  535         /* Two disks is minimum. */
  536         if (md->md_all < 2) {
  537                 G_SHSEC_DEBUG(0, "Too few disks defined for %s.", md->md_name);
  538                 return (NULL);
  539         }
  540 
  541         /* Check for duplicate unit */
  542         LIST_FOREACH(gp, &mp->geom, geom) {
  543                 sc = gp->softc;
  544                 if (sc != NULL && strcmp(sc->sc_name, md->md_name) == 0) {
  545                         G_SHSEC_DEBUG(0, "Device %s already configured.",
  546                             sc->sc_name);
  547                         return (NULL);
  548                 }
  549         }
  550         gp = g_new_geomf(mp, "%s", md->md_name);
  551         sc = malloc(sizeof(*sc), M_SHSEC, M_WAITOK | M_ZERO);
  552         gp->start = g_shsec_start;
  553         gp->spoiled = g_shsec_orphan;
  554         gp->orphan = g_shsec_orphan;
  555         gp->access = g_shsec_access;
  556         gp->dumpconf = g_shsec_dumpconf;
  557 
  558         sc->sc_id = md->md_id;
  559         sc->sc_ndisks = md->md_all;
  560         sc->sc_disks = malloc(sizeof(struct g_consumer *) * sc->sc_ndisks,
  561             M_SHSEC, M_WAITOK | M_ZERO);
  562         for (no = 0; no < sc->sc_ndisks; no++)
  563                 sc->sc_disks[no] = NULL;
  564 
  565         gp->softc = sc;
  566         sc->sc_geom = gp;
  567         sc->sc_provider = NULL;
  568 
  569         G_SHSEC_DEBUG(0, "Device %s created (id=%u).", sc->sc_name, sc->sc_id);
  570 
  571         return (gp);
  572 }
  573 
  574 static int
  575 g_shsec_destroy(struct g_shsec_softc *sc, boolean_t force)
  576 {
  577         struct g_provider *pp;
  578         struct g_geom *gp;
  579         u_int no;
  580 
  581         g_topology_assert();
  582 
  583         if (sc == NULL)
  584                 return (ENXIO);
  585 
  586         pp = sc->sc_provider;
  587         if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
  588                 if (force) {
  589                         G_SHSEC_DEBUG(0, "Device %s is still open, so it "
  590                             "can't be definitely removed.", pp->name);
  591                 } else {
  592                         G_SHSEC_DEBUG(1,
  593                             "Device %s is still open (r%dw%de%d).", pp->name,
  594                             pp->acr, pp->acw, pp->ace);
  595                         return (EBUSY);
  596                 }
  597         }
  598 
  599         for (no = 0; no < sc->sc_ndisks; no++) {
  600                 if (sc->sc_disks[no] != NULL)
  601                         g_shsec_remove_disk(sc->sc_disks[no]);
  602         }
  603 
  604         gp = sc->sc_geom;
  605         gp->softc = NULL;
  606         KASSERT(sc->sc_provider == NULL, ("Provider still exists? (device=%s)",
  607             gp->name));
  608         free(sc->sc_disks, M_SHSEC);
  609         free(sc, M_SHSEC);
  610 
  611         pp = LIST_FIRST(&gp->provider);
  612         if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0))
  613                 G_SHSEC_DEBUG(0, "Device %s destroyed.", gp->name);
  614 
  615         g_wither_geom(gp, ENXIO);
  616 
  617         return (0);
  618 }
  619 
  620 static int
  621 g_shsec_destroy_geom(struct gctl_req *req __unused, struct g_class *mp __unused,
  622     struct g_geom *gp)
  623 {
  624         struct g_shsec_softc *sc;
  625 
  626         sc = gp->softc;
  627         return (g_shsec_destroy(sc, 0));
  628 }
  629 
  630 static struct g_geom *
  631 g_shsec_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
  632 {
  633         struct g_shsec_metadata md;
  634         struct g_shsec_softc *sc;
  635         struct g_consumer *cp;
  636         struct g_geom *gp;
  637         int error;
  638 
  639         g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
  640         g_topology_assert();
  641 
  642         /* Skip providers that are already open for writing. */
  643         if (pp->acw > 0)
  644                 return (NULL);
  645 
  646         G_SHSEC_DEBUG(3, "Tasting %s.", pp->name);
  647 
  648         gp = g_new_geomf(mp, "shsec:taste");
  649         gp->start = g_shsec_start;
  650         gp->access = g_shsec_access;
  651         gp->orphan = g_shsec_orphan;
  652         cp = g_new_consumer(gp);
  653         g_attach(cp, pp);
  654         error = g_shsec_read_metadata(cp, &md);
  655         g_detach(cp);
  656         g_destroy_consumer(cp);
  657         g_destroy_geom(gp);
  658         if (error != 0)
  659                 return (NULL);
  660         gp = NULL;
  661 
  662         if (strcmp(md.md_magic, G_SHSEC_MAGIC) != 0)
  663                 return (NULL);
  664         if (md.md_version > G_SHSEC_VERSION) {
  665                 G_SHSEC_DEBUG(0, "Kernel module is too old to handle %s.\n",
  666                     pp->name);
  667                 return (NULL);
  668         }
  669         /*
  670          * Backward compatibility:
  671          */
  672         /* There was no md_provsize field in earlier versions of metadata. */
  673         if (md.md_version < 1)
  674                 md.md_provsize = pp->mediasize;
  675 
  676         if (md.md_provider[0] != '\0' &&
  677             !g_compare_names(md.md_provider, pp->name))
  678                 return (NULL);
  679         if (md.md_provsize != pp->mediasize)
  680                 return (NULL);
  681 
  682         /*
  683          * Let's check if device already exists.
  684          */
  685         sc = NULL;
  686         LIST_FOREACH(gp, &mp->geom, geom) {
  687                 sc = gp->softc;
  688                 if (sc == NULL)
  689                         continue;
  690                 if (strcmp(md.md_name, sc->sc_name) != 0)
  691                         continue;
  692                 if (md.md_id != sc->sc_id)
  693                         continue;
  694                 break;
  695         }
  696         if (gp != NULL) {
  697                 G_SHSEC_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
  698                 error = g_shsec_add_disk(sc, pp, md.md_no);
  699                 if (error != 0) {
  700                         G_SHSEC_DEBUG(0, "Cannot add disk %s to %s (error=%d).",
  701                             pp->name, gp->name, error);
  702                         return (NULL);
  703                 }
  704         } else {
  705                 gp = g_shsec_create(mp, &md);
  706                 if (gp == NULL) {
  707                         G_SHSEC_DEBUG(0, "Cannot create device %s.", md.md_name);
  708                         return (NULL);
  709                 }
  710                 sc = gp->softc;
  711                 G_SHSEC_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
  712                 error = g_shsec_add_disk(sc, pp, md.md_no);
  713                 if (error != 0) {
  714                         G_SHSEC_DEBUG(0, "Cannot add disk %s to %s (error=%d).",
  715                             pp->name, gp->name, error);
  716                         g_shsec_destroy(sc, 1);
  717                         return (NULL);
  718                 }
  719         }
  720         return (gp);
  721 }
  722 
  723 static struct g_shsec_softc *
  724 g_shsec_find_device(struct g_class *mp, const char *name)
  725 {
  726         struct g_shsec_softc *sc;
  727         struct g_geom *gp;
  728 
  729         LIST_FOREACH(gp, &mp->geom, geom) {
  730                 sc = gp->softc;
  731                 if (sc == NULL)
  732                         continue;
  733                 if (strcmp(sc->sc_name, name) == 0)
  734                         return (sc);
  735         }
  736         return (NULL);
  737 }
  738 
  739 static void
  740 g_shsec_ctl_destroy(struct gctl_req *req, struct g_class *mp)
  741 {
  742         struct g_shsec_softc *sc;
  743         int *force, *nargs, error;
  744         const char *name;
  745         char param[16];
  746         u_int i;
  747 
  748         g_topology_assert();
  749 
  750         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
  751         if (nargs == NULL) {
  752                 gctl_error(req, "No '%s' argument.", "nargs");
  753                 return;
  754         }
  755         if (*nargs <= 0) {
  756                 gctl_error(req, "Missing device(s).");
  757                 return;
  758         }
  759         force = gctl_get_paraml(req, "force", sizeof(*force));
  760         if (force == NULL) {
  761                 gctl_error(req, "No '%s' argument.", "force");
  762                 return;
  763         }
  764 
  765         for (i = 0; i < (u_int)*nargs; i++) {
  766                 snprintf(param, sizeof(param), "arg%u", i);
  767                 name = gctl_get_asciiparam(req, param);
  768                 if (name == NULL) {
  769                         gctl_error(req, "No 'arg%u' argument.", i);
  770                         return;
  771                 }
  772                 sc = g_shsec_find_device(mp, name);
  773                 if (sc == NULL) {
  774                         gctl_error(req, "No such device: %s.", name);
  775                         return;
  776                 }
  777                 error = g_shsec_destroy(sc, *force);
  778                 if (error != 0) {
  779                         gctl_error(req, "Cannot destroy device %s (error=%d).",
  780                             sc->sc_name, error);
  781                         return;
  782                 }
  783         }
  784 }
  785 
  786 static void
  787 g_shsec_config(struct gctl_req *req, struct g_class *mp, const char *verb)
  788 {
  789         uint32_t *version;
  790 
  791         g_topology_assert();
  792 
  793         version = gctl_get_paraml(req, "version", sizeof(*version));
  794         if (version == NULL) {
  795                 gctl_error(req, "No '%s' argument.", "version");
  796                 return;
  797         }
  798         if (*version != G_SHSEC_VERSION) {
  799                 gctl_error(req, "Userland and kernel parts are out of sync.");
  800                 return;
  801         }
  802 
  803         if (strcmp(verb, "stop") == 0) {
  804                 g_shsec_ctl_destroy(req, mp);
  805                 return;
  806         }
  807 
  808         gctl_error(req, "Unknown verb.");
  809 }
  810 
  811 static void
  812 g_shsec_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
  813     struct g_consumer *cp, struct g_provider *pp)
  814 {
  815         struct g_shsec_softc *sc;
  816 
  817         sc = gp->softc;
  818         if (sc == NULL)
  819                 return;
  820         if (pp != NULL) {
  821                 /* Nothing here. */
  822         } else if (cp != NULL) {
  823                 sbuf_printf(sb, "%s<Number>%u</Number>\n", indent,
  824                     (u_int)cp->index);
  825         } else {
  826                 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id);
  827                 sbuf_printf(sb, "%s<Status>Total=%u, Online=%u</Status>\n",
  828                     indent, sc->sc_ndisks, g_shsec_nvalid(sc));
  829                 sbuf_printf(sb, "%s<State>", indent);
  830                 if (sc->sc_provider != NULL && sc->sc_provider->error == 0)
  831                         sbuf_printf(sb, "UP");
  832                 else
  833                         sbuf_printf(sb, "DOWN");
  834                 sbuf_printf(sb, "</State>\n");
  835         }
  836 }
  837 
  838 DECLARE_GEOM_CLASS(g_shsec_class, g_shsec);

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