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