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/6.0/sys/geom/shsec/g_shsec.c 142727 2005-02-27 23:07:47Z pjd $");
   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/sysctl.h>
   38 #include <sys/malloc.h>
   39 #include <vm/uma.h>
   40 #include <geom/geom.h>
   41 #include <geom/shsec/g_shsec.h>
   42 
   43 
   44 static MALLOC_DEFINE(M_SHSEC, "shsec data", "GEOM_SHSEC Data");
   45 
   46 static uma_zone_t g_shsec_zone;
   47 
   48 static int g_shsec_destroy(struct g_shsec_softc *sc, boolean_t force);
   49 static int g_shsec_destroy_geom(struct gctl_req *req, struct g_class *mp,
   50     struct g_geom *gp);
   51 
   52 static g_taste_t g_shsec_taste;
   53 static g_ctl_req_t g_shsec_config;
   54 static g_dumpconf_t g_shsec_dumpconf;
   55 static g_init_t g_shsec_init;
   56 static g_fini_t g_shsec_fini;
   57 
   58 struct g_class g_shsec_class = {
   59         .name = G_SHSEC_CLASS_NAME,
   60         .version = G_VERSION,
   61         .ctlreq = g_shsec_config,
   62         .taste = g_shsec_taste,
   63         .destroy_geom = g_shsec_destroy_geom,
   64         .init = g_shsec_init,
   65         .fini = g_shsec_fini
   66 };
   67 
   68 SYSCTL_DECL(_kern_geom);
   69 SYSCTL_NODE(_kern_geom, OID_AUTO, shsec, CTLFLAG_RW, 0, "GEOM_SHSEC stuff");
   70 static u_int g_shsec_debug = 0;
   71 TUNABLE_INT("kern.geom.shsec.debug", &g_shsec_debug);
   72 SYSCTL_UINT(_kern_geom_shsec, OID_AUTO, debug, CTLFLAG_RW, &g_shsec_debug, 0,
   73     "Debug level");
   74 static u_int g_shsec_maxmem = MAXPHYS * 100;
   75 TUNABLE_INT("kern.geom.shsec.maxmem", &g_shsec_maxmem);
   76 SYSCTL_UINT(_kern_geom_shsec, OID_AUTO, maxmem, CTLFLAG_RD, &g_shsec_maxmem,
   77     0, "Maximum memory that can be allocated for I/O (in bytes)");
   78 static u_int g_shsec_alloc_failed = 0;
   79 SYSCTL_UINT(_kern_geom_shsec, OID_AUTO, alloc_failed, CTLFLAG_RD,
   80     &g_shsec_alloc_failed, 0, "How many times I/O allocation failed");
   81 
   82 /*
   83  * Greatest Common Divisor.
   84  */
   85 static u_int
   86 gcd(u_int a, u_int b)
   87 {
   88         u_int c;
   89 
   90         while (b != 0) {
   91                 c = a;
   92                 a = b;
   93                 b = (c % b);
   94         }
   95         return (a);
   96 }
   97 
   98 /*
   99  * Least Common Multiple.
  100  */
  101 static u_int
  102 lcm(u_int a, u_int b)
  103 {
  104 
  105         return ((a * b) / gcd(a, b));
  106 }
  107 
  108 static void
  109 g_shsec_init(struct g_class *mp __unused)
  110 {
  111 
  112         g_shsec_zone = uma_zcreate("g_shsec_zone", MAXPHYS, NULL, NULL, NULL,
  113             NULL, 0, 0);
  114         g_shsec_maxmem -= g_shsec_maxmem % MAXPHYS;
  115         uma_zone_set_max(g_shsec_zone, g_shsec_maxmem / MAXPHYS);
  116 }
  117 
  118 static void
  119 g_shsec_fini(struct g_class *mp __unused)
  120 {
  121 
  122         uma_zdestroy(g_shsec_zone);
  123 }
  124 
  125 /*
  126  * Return the number of valid disks.
  127  */
  128 static u_int
  129 g_shsec_nvalid(struct g_shsec_softc *sc)
  130 {
  131         u_int i, no;
  132 
  133         no = 0;
  134         for (i = 0; i < sc->sc_ndisks; i++) {
  135                 if (sc->sc_disks[i] != NULL)
  136                         no++;
  137         }
  138 
  139         return (no);
  140 }
  141 
  142 static void
  143 g_shsec_remove_disk(struct g_consumer *cp)
  144 {
  145         struct g_shsec_softc *sc;
  146         u_int no;
  147 
  148         KASSERT(cp != NULL, ("Non-valid disk in %s.", __func__));
  149         sc = (struct g_shsec_softc *)cp->private;
  150         KASSERT(sc != NULL, ("NULL sc in %s.", __func__));
  151         no = cp->index;
  152 
  153         G_SHSEC_DEBUG(0, "Disk %s removed from %s.", cp->provider->name,
  154             sc->sc_name);
  155 
  156         sc->sc_disks[no] = NULL;
  157         if (sc->sc_provider != NULL) {
  158                 g_orphan_provider(sc->sc_provider, ENXIO);
  159                 sc->sc_provider = NULL;
  160                 G_SHSEC_DEBUG(0, "Device %s removed.", sc->sc_name);
  161         }
  162 
  163         if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
  164                 g_access(cp, -cp->acr, -cp->acw, -cp->ace);
  165         g_detach(cp);
  166         g_destroy_consumer(cp);
  167 }
  168 
  169 static void
  170 g_shsec_orphan(struct g_consumer *cp)
  171 {
  172         struct g_shsec_softc *sc;
  173         struct g_geom *gp;
  174 
  175         g_topology_assert();
  176         gp = cp->geom;
  177         sc = gp->softc;
  178         if (sc == NULL)
  179                 return;
  180 
  181         g_shsec_remove_disk(cp);
  182         /* If there are no valid disks anymore, remove device. */
  183         if (g_shsec_nvalid(sc) == 0)
  184                 g_shsec_destroy(sc, 1);
  185 }
  186 
  187 static int
  188 g_shsec_access(struct g_provider *pp, int dr, int dw, int de)
  189 {
  190         struct g_consumer *cp1, *cp2;
  191         struct g_shsec_softc *sc;
  192         struct g_geom *gp;
  193         int error;
  194 
  195         gp = pp->geom;
  196         sc = gp->softc;
  197 
  198         if (sc == NULL) {
  199                 /*
  200                  * It looks like geom is being withered.
  201                  * In that case we allow only negative requests.
  202                  */
  203                 KASSERT(dr <= 0 && dw <= 0 && de <= 0,
  204                     ("Positive access request (device=%s).", pp->name));
  205                 if ((pp->acr + dr) == 0 && (pp->acw + dw) == 0 &&
  206                     (pp->ace + de) == 0) {
  207                         G_SHSEC_DEBUG(0, "Device %s definitely destroyed.",
  208                             gp->name);
  209                 }
  210                 return (0);
  211         }
  212 
  213         /* On first open, grab an extra "exclusive" bit */
  214         if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)
  215                 de++;
  216         /* ... and let go of it on last close */
  217         if ((pp->acr + dr) == 0 && (pp->acw + dw) == 0 && (pp->ace + de) == 0)
  218                 de--;
  219 
  220         error = ENXIO;
  221         LIST_FOREACH(cp1, &gp->consumer, consumer) {
  222                 error = g_access(cp1, dr, dw, de);
  223                 if (error == 0)
  224                         continue;
  225                 /*
  226                  * If we fail here, backout all previous changes.
  227                  */
  228                 LIST_FOREACH(cp2, &gp->consumer, consumer) {
  229                         if (cp1 == cp2)
  230                                 return (error);
  231                         g_access(cp2, -dr, -dw, -de);
  232                 }
  233                 /* NOTREACHED */
  234         }
  235 
  236         return (error);
  237 }
  238 
  239 static void
  240 g_shsec_xor1(uint32_t *src, uint32_t *dst, ssize_t len)
  241 {
  242 
  243         for (; len > 0; len -= sizeof(uint32_t), dst++)
  244                 *dst = *dst ^ *src++;
  245         KASSERT(len == 0, ("len != 0 (len=%zd)", len));
  246 }
  247 
  248 static void
  249 g_shsec_done(struct bio *bp)
  250 {
  251         struct g_shsec_softc *sc;
  252         struct bio *pbp;
  253 
  254         pbp = bp->bio_parent;
  255         sc = pbp->bio_to->geom->softc;
  256         if (bp->bio_error == 0)
  257                 G_SHSEC_LOGREQ(2, bp, "Request done.");
  258         else {
  259                 G_SHSEC_LOGREQ(0, bp, "Request failed (error=%d).",
  260                     bp->bio_error);
  261                 if (pbp->bio_error == 0)
  262                         pbp->bio_error = bp->bio_error;
  263         }
  264         if (pbp->bio_cmd == BIO_READ) {
  265                 if ((pbp->bio_pflags & G_SHSEC_BFLAG_FIRST) != 0) {
  266                         bcopy(bp->bio_data, pbp->bio_data, pbp->bio_length);
  267                         pbp->bio_pflags = 0;
  268                 } else {
  269                         g_shsec_xor1((uint32_t *)bp->bio_data,
  270                             (uint32_t *)pbp->bio_data,
  271                             (ssize_t)pbp->bio_length);
  272                 }
  273         }
  274         bzero(bp->bio_data, bp->bio_length);
  275         uma_zfree(g_shsec_zone, bp->bio_data);
  276         g_destroy_bio(bp);
  277         pbp->bio_inbed++;
  278         if (pbp->bio_children == pbp->bio_inbed) {
  279                 pbp->bio_completed = pbp->bio_length;
  280                 g_io_deliver(pbp, pbp->bio_error);
  281         }
  282 }
  283 
  284 static void
  285 g_shsec_xor2(uint32_t *rand, uint32_t *dst, ssize_t len)
  286 {
  287 
  288         for (; len > 0; len -= sizeof(uint32_t), dst++) {
  289                 *rand = arc4random();
  290                 *dst = *dst ^ *rand++;
  291         }
  292         KASSERT(len == 0, ("len != 0 (len=%zd)", len));
  293 }
  294 
  295 static void
  296 g_shsec_start(struct bio *bp)
  297 {
  298         TAILQ_HEAD(, bio) queue = TAILQ_HEAD_INITIALIZER(queue);
  299         struct g_shsec_softc *sc;
  300         struct bio *cbp;
  301         uint32_t *dst;
  302         ssize_t len;
  303         u_int no;
  304         int error;
  305 
  306         sc = bp->bio_to->geom->softc;
  307         /*
  308          * If sc == NULL, provider's error should be set and g_shsec_start()
  309          * should not be called at all.
  310          */
  311         KASSERT(sc != NULL,
  312             ("Provider's error should be set (error=%d)(device=%s).",
  313             bp->bio_to->error, bp->bio_to->name));
  314 
  315         G_SHSEC_LOGREQ(2, bp, "Request received.");
  316 
  317         switch (bp->bio_cmd) {
  318         case BIO_READ:
  319         case BIO_WRITE:
  320                 /*
  321                  * Only those requests are supported.
  322                  */
  323                 break;
  324         case BIO_DELETE:
  325         case BIO_GETATTR:
  326                 /* To which provider it should be delivered? */
  327         default:
  328                 g_io_deliver(bp, EOPNOTSUPP);
  329                 return;
  330         }
  331 
  332         /*
  333          * Allocate all bios first and calculate XOR.
  334          */
  335         dst = NULL;
  336         len = bp->bio_length;
  337         if (bp->bio_cmd == BIO_READ)
  338                 bp->bio_pflags = G_SHSEC_BFLAG_FIRST;
  339         for (no = 0; no < sc->sc_ndisks; no++) {
  340                 cbp = g_clone_bio(bp);
  341                 if (cbp == NULL) {
  342                         error = ENOMEM;
  343                         goto failure;
  344                 }
  345                 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue);
  346 
  347                 /*
  348                  * Fill in the component buf structure.
  349                  */
  350                 cbp->bio_done = g_shsec_done;
  351                 cbp->bio_data = uma_zalloc(g_shsec_zone, M_NOWAIT);
  352                 if (cbp->bio_data == NULL) {
  353                         g_shsec_alloc_failed++;
  354                         error = ENOMEM;
  355                         goto failure;
  356                 }
  357                 cbp->bio_caller2 = sc->sc_disks[no];
  358                 if (bp->bio_cmd == BIO_WRITE) {
  359                         if (no == 0) {
  360                                 dst = (uint32_t *)cbp->bio_data;
  361                                 bcopy(bp->bio_data, dst, len);
  362                         } else {
  363                                 g_shsec_xor2((uint32_t *)cbp->bio_data, dst,
  364                                     len);
  365                         }
  366                 }
  367         }
  368         /*
  369          * Fire off all allocated requests!
  370          */
  371         while ((cbp = TAILQ_FIRST(&queue)) != NULL) {
  372                 struct g_consumer *cp;
  373 
  374                 TAILQ_REMOVE(&queue, cbp, bio_queue);
  375                 cp = cbp->bio_caller2;
  376                 cbp->bio_caller2 = NULL;
  377                 cbp->bio_to = cp->provider;
  378                 G_SHSEC_LOGREQ(2, cbp, "Sending request.");
  379                 g_io_request(cbp, cp);
  380         }
  381         return;
  382 failure:
  383         while ((cbp = TAILQ_FIRST(&queue)) != NULL) {
  384                 TAILQ_REMOVE(&queue, cbp, bio_queue);
  385                 bp->bio_children--;
  386                 if (cbp->bio_data != NULL) {
  387                         bzero(cbp->bio_data, cbp->bio_length);
  388                         uma_zfree(g_shsec_zone, cbp->bio_data);
  389                 }
  390                 g_destroy_bio(cbp);
  391         }
  392         if (bp->bio_error == 0)
  393                 bp->bio_error = error;
  394         g_io_deliver(bp, bp->bio_error);
  395 }
  396 
  397 static void
  398 g_shsec_check_and_run(struct g_shsec_softc *sc)
  399 {
  400         off_t mediasize, ms;
  401         u_int no, sectorsize = 0;
  402 
  403         if (g_shsec_nvalid(sc) != sc->sc_ndisks)
  404                 return;
  405 
  406         sc->sc_provider = g_new_providerf(sc->sc_geom, "shsec/%s", sc->sc_name);
  407         /*
  408          * Find the smallest disk.
  409          */
  410         mediasize = sc->sc_disks[0]->provider->mediasize;
  411         mediasize -= sc->sc_disks[0]->provider->sectorsize;
  412         sectorsize = sc->sc_disks[0]->provider->sectorsize;
  413         for (no = 1; no < sc->sc_ndisks; no++) {
  414                 ms = sc->sc_disks[no]->provider->mediasize;
  415                 ms -= sc->sc_disks[no]->provider->sectorsize;
  416                 if (ms < mediasize)
  417                         mediasize = ms;
  418                 sectorsize = lcm(sectorsize,
  419                     sc->sc_disks[no]->provider->sectorsize);
  420         }
  421         sc->sc_provider->sectorsize = sectorsize;
  422         sc->sc_provider->mediasize = mediasize;
  423         g_error_provider(sc->sc_provider, 0);
  424 
  425         G_SHSEC_DEBUG(0, "Device %s activated.", sc->sc_name);
  426 }
  427 
  428 static int
  429 g_shsec_read_metadata(struct g_consumer *cp, struct g_shsec_metadata *md)
  430 {
  431         struct g_provider *pp;
  432         u_char *buf;
  433         int error;
  434 
  435         g_topology_assert();
  436 
  437         error = g_access(cp, 1, 0, 0);
  438         if (error != 0)
  439                 return (error);
  440         pp = cp->provider;
  441         g_topology_unlock();
  442         buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
  443             &error);
  444         g_topology_lock();
  445         g_access(cp, -1, 0, 0);
  446         if (buf == NULL)
  447                 return (error);
  448 
  449         /* Decode metadata. */
  450         shsec_metadata_decode(buf, md);
  451         g_free(buf);
  452 
  453         return (0);
  454 }
  455 
  456 /*
  457  * Add disk to given device.
  458  */
  459 static int
  460 g_shsec_add_disk(struct g_shsec_softc *sc, struct g_provider *pp, u_int no)
  461 {
  462         struct g_consumer *cp, *fcp;
  463         struct g_geom *gp;
  464         struct g_shsec_metadata md;
  465         int error;
  466 
  467         /* Metadata corrupted? */
  468         if (no >= sc->sc_ndisks)
  469                 return (EINVAL);
  470 
  471         /* Check if disk is not already attached. */
  472         if (sc->sc_disks[no] != NULL)
  473                 return (EEXIST);
  474 
  475         gp = sc->sc_geom;
  476         fcp = LIST_FIRST(&gp->consumer);
  477 
  478         cp = g_new_consumer(gp);
  479         error = g_attach(cp, pp);
  480         if (error != 0) {
  481                 g_destroy_consumer(cp);
  482                 return (error);
  483         }
  484 
  485         if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0)) {
  486                 error = g_access(cp, fcp->acr, fcp->acw, fcp->ace);
  487                 if (error != 0) {
  488                         g_detach(cp);
  489                         g_destroy_consumer(cp);
  490                         return (error);
  491                 }
  492         }
  493 
  494         /* Reread metadata. */
  495         error = g_shsec_read_metadata(cp, &md);
  496         if (error != 0)
  497                 goto fail;
  498 
  499         if (strcmp(md.md_magic, G_SHSEC_MAGIC) != 0 ||
  500             strcmp(md.md_name, sc->sc_name) != 0 || md.md_id != sc->sc_id) {
  501                 G_SHSEC_DEBUG(0, "Metadata on %s changed.", pp->name);
  502                 goto fail;
  503         }
  504 
  505         cp->private = sc;
  506         cp->index = no;
  507         sc->sc_disks[no] = cp;
  508 
  509         G_SHSEC_DEBUG(0, "Disk %s attached to %s.", pp->name, sc->sc_name);
  510 
  511         g_shsec_check_and_run(sc);
  512 
  513         return (0);
  514 fail:
  515         if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0))
  516                 g_access(cp, -fcp->acr, -fcp->acw, -fcp->ace);
  517         g_detach(cp);
  518         g_destroy_consumer(cp);
  519         return (error);
  520 }
  521 
  522 static struct g_geom *
  523 g_shsec_create(struct g_class *mp, const struct g_shsec_metadata *md)
  524 {
  525         struct g_shsec_softc *sc;
  526         struct g_geom *gp;
  527         u_int no;
  528 
  529         G_SHSEC_DEBUG(1, "Creating device %s (id=%u).", md->md_name, md->md_id);
  530 
  531         /* Two disks is minimum. */
  532         if (md->md_all < 2) {
  533                 G_SHSEC_DEBUG(0, "Too few disks defined for %s.", md->md_name);
  534                 return (NULL);
  535         }
  536 
  537         /* Check for duplicate unit */
  538         LIST_FOREACH(gp, &mp->geom, geom) {
  539                 sc = gp->softc;
  540                 if (sc != NULL && strcmp(sc->sc_name, md->md_name) == 0) {
  541                         G_SHSEC_DEBUG(0, "Device %s already configured.",
  542                             sc->sc_name);
  543                         return (NULL);
  544                 }
  545         }
  546         gp = g_new_geomf(mp, "%s", md->md_name);
  547         gp->softc = NULL;       /* for a moment */
  548 
  549         sc = malloc(sizeof(*sc), M_SHSEC, M_WAITOK | M_ZERO);
  550         gp->start = g_shsec_start;
  551         gp->spoiled = g_shsec_orphan;
  552         gp->orphan = g_shsec_orphan;
  553         gp->access = g_shsec_access;
  554         gp->dumpconf = g_shsec_dumpconf;
  555 
  556         sc->sc_id = md->md_id;
  557         sc->sc_ndisks = md->md_all;
  558         sc->sc_disks = malloc(sizeof(struct g_consumer *) * sc->sc_ndisks,
  559             M_SHSEC, M_WAITOK | M_ZERO);
  560         for (no = 0; no < sc->sc_ndisks; no++)
  561                 sc->sc_disks[no] = NULL;
  562 
  563         gp->softc = sc;
  564         sc->sc_geom = gp;
  565         sc->sc_provider = NULL;
  566 
  567         G_SHSEC_DEBUG(0, "Device %s created (id=%u).", sc->sc_name, sc->sc_id);
  568 
  569         return (gp);
  570 }
  571 
  572 static int
  573 g_shsec_destroy(struct g_shsec_softc *sc, boolean_t force)
  574 {
  575         struct g_provider *pp;
  576         struct g_geom *gp;
  577         u_int no;
  578 
  579         g_topology_assert();
  580 
  581         if (sc == NULL)
  582                 return (ENXIO);
  583 
  584         pp = sc->sc_provider;
  585         if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
  586                 if (force) {
  587                         G_SHSEC_DEBUG(0, "Device %s is still open, so it "
  588                             "can't be definitely removed.", pp->name);
  589                 } else {
  590                         G_SHSEC_DEBUG(1,
  591                             "Device %s is still open (r%dw%de%d).", pp->name,
  592                             pp->acr, pp->acw, pp->ace);
  593                         return (EBUSY);
  594                 }
  595         }
  596 
  597         for (no = 0; no < sc->sc_ndisks; no++) {
  598                 if (sc->sc_disks[no] != NULL)
  599                         g_shsec_remove_disk(sc->sc_disks[no]);
  600         }
  601 
  602         gp = sc->sc_geom;
  603         gp->softc = NULL;
  604         KASSERT(sc->sc_provider == NULL, ("Provider still exists? (device=%s)",
  605             gp->name));
  606         free(sc->sc_disks, M_SHSEC);
  607         free(sc, M_SHSEC);
  608 
  609         pp = LIST_FIRST(&gp->provider); 
  610         if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0))
  611                 G_SHSEC_DEBUG(0, "Device %s destroyed.", gp->name);
  612 
  613         g_wither_geom(gp, ENXIO);
  614 
  615         return (0);
  616 }
  617 
  618 static int
  619 g_shsec_destroy_geom(struct gctl_req *req __unused, struct g_class *mp __unused,
  620     struct g_geom *gp)
  621 {
  622         struct g_shsec_softc *sc;
  623 
  624         sc = gp->softc;
  625         return (g_shsec_destroy(sc, 0));
  626 }
  627 
  628 static struct g_geom *
  629 g_shsec_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
  630 {
  631         struct g_shsec_metadata md;
  632         struct g_shsec_softc *sc;
  633         struct g_consumer *cp;
  634         struct g_geom *gp;
  635         int error;
  636 
  637         g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
  638         g_topology_assert();
  639 
  640         G_SHSEC_DEBUG(3, "Tasting %s.", pp->name);
  641 
  642         gp = g_new_geomf(mp, "shsec:taste");
  643         gp->start = g_shsec_start;
  644         gp->access = g_shsec_access;
  645         gp->orphan = g_shsec_orphan;
  646         cp = g_new_consumer(gp);
  647         g_attach(cp, pp);
  648         error = g_shsec_read_metadata(cp, &md);
  649         g_detach(cp);
  650         g_destroy_consumer(cp);
  651         g_destroy_geom(gp);
  652         if (error != 0)
  653                 return (NULL);
  654         gp = NULL;
  655 
  656         if (strcmp(md.md_magic, G_SHSEC_MAGIC) != 0)
  657                 return (NULL);
  658         if (md.md_version > G_SHSEC_VERSION) {
  659                 G_SHSEC_DEBUG(0, "Kernel module is too old to handle %s.\n",
  660                     pp->name);
  661                 return (NULL);
  662         }
  663         /*
  664          * Backward compatibility:
  665          */
  666         /* There was no md_provsize field in earlier versions of metadata. */
  667         if (md.md_version < 1)
  668                 md.md_provsize = pp->mediasize;
  669 
  670         if (md.md_provider[0] != '\0' && strcmp(md.md_provider, pp->name) != 0)
  671                 return (NULL);
  672         if (md.md_provsize != pp->mediasize)
  673                 return (NULL);
  674 
  675         /*
  676          * Let's check if device already exists.
  677          */
  678         sc = NULL;
  679         LIST_FOREACH(gp, &mp->geom, geom) {
  680                 sc = gp->softc;
  681                 if (sc == NULL)
  682                         continue;
  683                 if (strcmp(md.md_name, sc->sc_name) != 0)
  684                         continue;
  685                 if (md.md_id != sc->sc_id)
  686                         continue;
  687                 break;
  688         }
  689         if (gp != NULL) {
  690                 G_SHSEC_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
  691                 error = g_shsec_add_disk(sc, pp, md.md_no);
  692                 if (error != 0) {
  693                         G_SHSEC_DEBUG(0, "Cannot add disk %s to %s (error=%d).",
  694                             pp->name, gp->name, error);
  695                         return (NULL);
  696                 }
  697         } else {
  698                 gp = g_shsec_create(mp, &md);
  699                 if (gp == NULL) {
  700                         G_SHSEC_DEBUG(0, "Cannot create device %s.", md.md_name);
  701                         return (NULL);
  702                 }
  703                 sc = gp->softc;
  704                 G_SHSEC_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
  705                 error = g_shsec_add_disk(sc, pp, md.md_no);
  706                 if (error != 0) {
  707                         G_SHSEC_DEBUG(0, "Cannot add disk %s to %s (error=%d).",
  708                             pp->name, gp->name, error);
  709                         g_shsec_destroy(sc, 1);
  710                         return (NULL);
  711                 }
  712         }
  713         return (gp);
  714 }
  715 
  716 static struct g_shsec_softc *
  717 g_shsec_find_device(struct g_class *mp, const char *name)
  718 {
  719         struct g_shsec_softc *sc;
  720         struct g_geom *gp;
  721 
  722         LIST_FOREACH(gp, &mp->geom, geom) {
  723                 sc = gp->softc;
  724                 if (sc == NULL)
  725                         continue;
  726                 if (strcmp(sc->sc_name, name) == 0)
  727                         return (sc);
  728         }
  729         return (NULL);
  730 }
  731 
  732 static void
  733 g_shsec_ctl_destroy(struct gctl_req *req, struct g_class *mp)
  734 {
  735         struct g_shsec_softc *sc;
  736         int *force, *nargs, error;
  737         const char *name;
  738         char param[16];
  739         u_int i;
  740 
  741         g_topology_assert();
  742 
  743         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
  744         if (nargs == NULL) {
  745                 gctl_error(req, "No '%s' argument.", "nargs");
  746                 return;
  747         }
  748         if (*nargs <= 0) {
  749                 gctl_error(req, "Missing device(s).");
  750                 return;
  751         }
  752         force = gctl_get_paraml(req, "force", sizeof(*force));
  753         if (force == NULL) {
  754                 gctl_error(req, "No '%s' argument.", "force");
  755                 return;
  756         }
  757 
  758         for (i = 0; i < (u_int)*nargs; i++) {
  759                 snprintf(param, sizeof(param), "arg%u", i);
  760                 name = gctl_get_asciiparam(req, param);
  761                 if (name == NULL) {
  762                         gctl_error(req, "No 'arg%u' argument.", i);
  763                         return;
  764                 }
  765                 sc = g_shsec_find_device(mp, name);
  766                 if (sc == NULL) {
  767                         gctl_error(req, "No such device: %s.", name);
  768                         return;
  769                 }
  770                 error = g_shsec_destroy(sc, *force);
  771                 if (error != 0) {
  772                         gctl_error(req, "Cannot destroy device %s (error=%d).",
  773                             sc->sc_name, error);
  774                         return;
  775                 }
  776         }
  777 }
  778 
  779 static void
  780 g_shsec_config(struct gctl_req *req, struct g_class *mp, const char *verb)
  781 {
  782         uint32_t *version;
  783 
  784         g_topology_assert();
  785 
  786         version = gctl_get_paraml(req, "version", sizeof(*version));
  787         if (version == NULL) {
  788                 gctl_error(req, "No '%s' argument.", "version");
  789                 return;
  790         }
  791         if (*version != G_SHSEC_VERSION) {
  792                 gctl_error(req, "Userland and kernel parts are out of sync.");
  793                 return;
  794         }
  795 
  796         if (strcmp(verb, "stop") == 0) {
  797                 g_shsec_ctl_destroy(req, mp);
  798                 return;
  799         }
  800 
  801         gctl_error(req, "Unknown verb.");
  802 }
  803 
  804 static void
  805 g_shsec_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
  806     struct g_consumer *cp, struct g_provider *pp)
  807 {
  808         struct g_shsec_softc *sc;
  809 
  810         sc = gp->softc;
  811         if (sc == NULL)
  812                 return;
  813         if (pp != NULL) {
  814                 /* Nothing here. */
  815         } else if (cp != NULL) {
  816                 sbuf_printf(sb, "%s<Number>%u</Number>\n", indent,
  817                     (u_int)cp->index);
  818         } else {
  819                 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id);
  820                 sbuf_printf(sb, "%s<Status>Total=%u, Online=%u</Status>\n",
  821                     indent, sc->sc_ndisks, g_shsec_nvalid(sc));
  822                 sbuf_printf(sb, "%s<State>", indent);
  823                 if (sc->sc_provider != NULL && sc->sc_provider->error == 0)
  824                         sbuf_printf(sb, "UP");
  825                 else
  826                         sbuf_printf(sb, "DOWN");
  827                 sbuf_printf(sb, "</State>\n");
  828         }
  829 }
  830 
  831 DECLARE_GEOM_CLASS(g_shsec_class, g_shsec);

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