g_shsec.c

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

FreeBSD/Linux Kernel Cross Reference
sys/geom/shsec/g_shsec.c
