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/geom_dbg.h>
   45 #include <geom/shsec/g_shsec.h>
   46 
   47 FEATURE(geom_shsec, "GEOM shared secret device support");
   48 
   49 static MALLOC_DEFINE(M_SHSEC, "shsec_data", "GEOM_SHSEC Data");
   50 
   51 static uma_zone_t g_shsec_zone;
   52 
   53 static int g_shsec_destroy(struct g_shsec_softc *sc, boolean_t force);
   54 static int g_shsec_destroy_geom(struct gctl_req *req, struct g_class *mp,
   55     struct g_geom *gp);
   56 
   57 static g_taste_t g_shsec_taste;
   58 static g_ctl_req_t g_shsec_config;
   59 static g_dumpconf_t g_shsec_dumpconf;
   60 static g_init_t g_shsec_init;
   61 static g_fini_t g_shsec_fini;
   62 
   63 struct g_class g_shsec_class = {
   64         .name = G_SHSEC_CLASS_NAME,
   65         .version = G_VERSION,
   66         .ctlreq = g_shsec_config,
   67         .taste = g_shsec_taste,
   68         .destroy_geom = g_shsec_destroy_geom,
   69         .init = g_shsec_init,
   70         .fini = g_shsec_fini
   71 };
   72 
   73 SYSCTL_DECL(_kern_geom);
   74 static SYSCTL_NODE(_kern_geom, OID_AUTO, shsec, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
   75     "GEOM_SHSEC stuff");
   76 static u_int g_shsec_debug;
   77 SYSCTL_UINT(_kern_geom_shsec, OID_AUTO, debug, CTLFLAG_RWTUN, &g_shsec_debug, 0,
   78     "Debug level");
   79 static u_long g_shsec_maxmem;
   80 SYSCTL_ULONG(_kern_geom_shsec, OID_AUTO, maxmem,
   81     CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &g_shsec_maxmem,
   82     0, "Maximum memory that can be allocated for I/O (in bytes)");
   83 static u_int g_shsec_alloc_failed = 0;
   84 SYSCTL_UINT(_kern_geom_shsec, OID_AUTO, alloc_failed, CTLFLAG_RD,
   85     &g_shsec_alloc_failed, 0, "How many times I/O allocation failed");
   86 
   87 /*
   88  * Greatest Common Divisor.
   89  */
   90 static u_int
   91 gcd(u_int a, u_int b)
   92 {
   93         u_int c;
   94 
   95         while (b != 0) {
   96                 c = a;
   97                 a = b;
   98                 b = (c % b);
   99         }
  100         return (a);
  101 }
  102 
  103 /*
  104  * Least Common Multiple.
  105  */
  106 static u_int
  107 lcm(u_int a, u_int b)
  108 {
  109 
  110         return ((a * b) / gcd(a, b));
  111 }
  112 
  113 static void
  114 g_shsec_init(struct g_class *mp __unused)
  115 {
  116 
  117         g_shsec_maxmem = maxphys * 100;
  118         TUNABLE_ULONG_FETCH("kern.geom.shsec.maxmem,", &g_shsec_maxmem);
  119         g_shsec_zone = uma_zcreate("g_shsec_zone", maxphys, NULL, NULL, NULL,
  120             NULL, 0, 0);
  121         g_shsec_maxmem -= g_shsec_maxmem % maxphys;
  122         uma_zone_set_max(g_shsec_zone, g_shsec_maxmem / maxphys);
  123 }
  124 
  125 static void
  126 g_shsec_fini(struct g_class *mp __unused)
  127 {
  128 
  129         uma_zdestroy(g_shsec_zone);
  130 }
  131 
  132 /*
  133  * Return the number of valid disks.
  134  */
  135 static u_int
  136 g_shsec_nvalid(struct g_shsec_softc *sc)
  137 {
  138         u_int i, no;
  139 
  140         no = 0;
  141         for (i = 0; i < sc->sc_ndisks; i++) {
  142                 if (sc->sc_disks[i] != NULL)
  143                         no++;
  144         }
  145 
  146         return (no);
  147 }
  148 
  149 static void
  150 g_shsec_remove_disk(struct g_consumer *cp)
  151 {
  152         struct g_shsec_softc *sc;
  153         u_int no;
  154 
  155         KASSERT(cp != NULL, ("Non-valid disk in %s.", __func__));
  156         sc = (struct g_shsec_softc *)cp->private;
  157         KASSERT(sc != NULL, ("NULL sc in %s.", __func__));
  158         no = cp->index;
  159 
  160         G_SHSEC_DEBUG(0, "Disk %s removed from %s.", cp->provider->name,
  161             sc->sc_name);
  162 
  163         sc->sc_disks[no] = NULL;
  164         if (sc->sc_provider != NULL) {
  165                 g_wither_provider(sc->sc_provider, ENXIO);
  166                 sc->sc_provider = NULL;
  167                 G_SHSEC_DEBUG(0, "Device %s removed.", sc->sc_name);
  168         }
  169 
  170         if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
  171                 return;
  172         g_detach(cp);
  173         g_destroy_consumer(cp);
  174 }
  175 
  176 static void
  177 g_shsec_orphan(struct g_consumer *cp)
  178 {
  179         struct g_shsec_softc *sc;
  180         struct g_geom *gp;
  181 
  182         g_topology_assert();
  183         gp = cp->geom;
  184         sc = gp->softc;
  185         if (sc == NULL)
  186                 return;
  187 
  188         g_shsec_remove_disk(cp);
  189         /* If there are no valid disks anymore, remove device. */
  190         if (LIST_EMPTY(&gp->consumer))
  191                 g_shsec_destroy(sc, 1);
  192 }
  193 
  194 static int
  195 g_shsec_access(struct g_provider *pp, int dr, int dw, int de)
  196 {
  197         struct g_consumer *cp1, *cp2, *tmp;
  198         struct g_shsec_softc *sc;
  199         struct g_geom *gp;
  200         int error;
  201 
  202         gp = pp->geom;
  203         sc = gp->softc;
  204 
  205         /* On first open, grab an extra "exclusive" bit */
  206         if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0)
  207                 de++;
  208         /* ... and let go of it on last close */
  209         if ((pp->acr + dr) == 0 && (pp->acw + dw) == 0 && (pp->ace + de) == 0)
  210                 de--;
  211 
  212         error = ENXIO;
  213         LIST_FOREACH_SAFE(cp1, &gp->consumer, consumer, tmp) {
  214                 error = g_access(cp1, dr, dw, de);
  215                 if (error != 0)
  216                         goto fail;
  217                 if (cp1->acr == 0 && cp1->acw == 0 && cp1->ace == 0 &&
  218                     cp1->flags & G_CF_ORPHAN) {
  219                         g_detach(cp1);
  220                         g_destroy_consumer(cp1);
  221                 }
  222         }
  223 
  224         /* If there are no valid disks anymore, remove device. */
  225         if (LIST_EMPTY(&gp->consumer))
  226                 g_shsec_destroy(sc, 1);
  227 
  228         return (error);
  229 
  230 fail:
  231         /* If we fail here, backout all previous changes. */
  232         LIST_FOREACH(cp2, &gp->consumer, consumer) {
  233                 if (cp1 == cp2)
  234                         break;
  235                 g_access(cp2, -dr, -dw, -de);
  236         }
  237         return (error);
  238 }
  239 
  240 static void
  241 g_shsec_xor1(uint32_t *src, uint32_t *dst, ssize_t len)
  242 {
  243 
  244         for (; len > 0; len -= sizeof(uint32_t), dst++)
  245                 *dst = *dst ^ *src++;
  246         KASSERT(len == 0, ("len != 0 (len=%zd)", len));
  247 }
  248 
  249 static void
  250 g_shsec_done(struct bio *bp)
  251 {
  252         struct bio *pbp;
  253 
  254         pbp = bp->bio_parent;
  255         if (bp->bio_error == 0)
  256                 G_SHSEC_LOGREQ(2, bp, "Request done.");
  257         else {
  258                 G_SHSEC_LOGREQ(0, bp, "Request failed (error=%d).",
  259                     bp->bio_error);
  260                 if (pbp->bio_error == 0)
  261                         pbp->bio_error = bp->bio_error;
  262         }
  263         if (pbp->bio_cmd == BIO_READ) {
  264                 if ((pbp->bio_pflags & G_SHSEC_BFLAG_FIRST) != 0) {
  265                         bcopy(bp->bio_data, pbp->bio_data, pbp->bio_length);
  266                         pbp->bio_pflags = 0;
  267                 } else {
  268                         g_shsec_xor1((uint32_t *)bp->bio_data,
  269                             (uint32_t *)pbp->bio_data,
  270                             (ssize_t)pbp->bio_length);
  271                 }
  272         }
  273         if (bp->bio_data != NULL) {
  274                 explicit_bzero(bp->bio_data, bp->bio_length);
  275                 uma_zfree(g_shsec_zone, bp->bio_data);
  276         }
  277         g_destroy_bio(bp);
  278         pbp->bio_inbed++;
  279         if (pbp->bio_children == pbp->bio_inbed) {
  280                 pbp->bio_completed = pbp->bio_length;
  281                 g_io_deliver(pbp, pbp->bio_error);
  282         }
  283 }
  284 
  285 static void
  286 g_shsec_xor2(uint32_t *rand, uint32_t *dst, ssize_t len)
  287 {
  288 
  289         for (; len > 0; len -= sizeof(uint32_t), dst++) {
  290                 *rand = arc4random();
  291                 *dst = *dst ^ *rand++;
  292         }
  293         KASSERT(len == 0, ("len != 0 (len=%zd)", len));
  294 }
  295 
  296 static void
  297 g_shsec_start(struct bio *bp)
  298 {
  299         TAILQ_HEAD(, bio) queue = TAILQ_HEAD_INITIALIZER(queue);
  300         struct g_shsec_softc *sc;
  301         struct bio *cbp;
  302         uint32_t *dst;
  303         ssize_t len;
  304         u_int no;
  305         int error;
  306 
  307         sc = bp->bio_to->geom->softc;
  308         /*
  309          * If sc == NULL, provider's error should be set and g_shsec_start()
  310          * should not be called at all.
  311          */
  312         KASSERT(sc != NULL,
  313             ("Provider's error should be set (error=%d)(device=%s).",
  314             bp->bio_to->error, bp->bio_to->name));
  315 
  316         G_SHSEC_LOGREQ(2, bp, "Request received.");
  317 
  318         switch (bp->bio_cmd) {
  319         case BIO_READ:
  320         case BIO_WRITE:
  321         case BIO_FLUSH:
  322         case BIO_SPEEDUP:
  323                 /*
  324                  * Only those requests are supported.
  325                  */
  326                 break;
  327         case BIO_DELETE:
  328         case BIO_GETATTR:
  329                 /* To which provider it should be delivered? */
  330         default:
  331                 g_io_deliver(bp, EOPNOTSUPP);
  332                 return;
  333         }
  334 
  335         /*
  336          * Allocate all bios first and calculate XOR.
  337          */
  338         dst = NULL;
  339         len = bp->bio_length;
  340         if (bp->bio_cmd == BIO_READ)
  341                 bp->bio_pflags = G_SHSEC_BFLAG_FIRST;
  342         for (no = 0; no < sc->sc_ndisks; no++) {
  343                 cbp = g_clone_bio(bp);
  344                 if (cbp == NULL) {
  345                         error = ENOMEM;
  346                         goto failure;
  347                 }
  348                 TAILQ_INSERT_TAIL(&queue, cbp, bio_queue);
  349 
  350                 /*
  351                  * Fill in the component buf structure.
  352                  */
  353                 cbp->bio_done = g_shsec_done;
  354                 cbp->bio_caller2 = sc->sc_disks[no];
  355                 if (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE) {
  356                         cbp->bio_data = uma_zalloc(g_shsec_zone, M_NOWAIT);
  357                         if (cbp->bio_data == NULL) {
  358                                 g_shsec_alloc_failed++;
  359                                 error = ENOMEM;
  360                                 goto failure;
  361                         }
  362                         if (bp->bio_cmd == BIO_WRITE) {
  363                                 if (no == 0) {
  364                                         dst = (uint32_t *)cbp->bio_data;
  365                                         bcopy(bp->bio_data, dst, len);
  366                                 } else {
  367                                         g_shsec_xor2((uint32_t *)cbp->bio_data,
  368                                             dst, len);
  369                                 }
  370                         }
  371                 }
  372         }
  373         /*
  374          * Fire off all allocated requests!
  375          */
  376         while ((cbp = TAILQ_FIRST(&queue)) != NULL) {
  377                 struct g_consumer *cp;
  378 
  379                 TAILQ_REMOVE(&queue, cbp, bio_queue);
  380                 cp = cbp->bio_caller2;
  381                 cbp->bio_caller2 = NULL;
  382                 cbp->bio_to = cp->provider;
  383                 G_SHSEC_LOGREQ(2, cbp, "Sending request.");
  384                 g_io_request(cbp, cp);
  385         }
  386         return;
  387 failure:
  388         while ((cbp = TAILQ_FIRST(&queue)) != NULL) {
  389                 TAILQ_REMOVE(&queue, cbp, bio_queue);
  390                 bp->bio_children--;
  391                 if (cbp->bio_data != NULL) {
  392                         explicit_bzero(cbp->bio_data, cbp->bio_length);
  393                         uma_zfree(g_shsec_zone, cbp->bio_data);
  394                 }
  395                 g_destroy_bio(cbp);
  396         }
  397         if (bp->bio_error == 0)
  398                 bp->bio_error = error;
  399         g_io_deliver(bp, bp->bio_error);
  400 }
  401 
  402 static void
  403 g_shsec_check_and_run(struct g_shsec_softc *sc)
  404 {
  405         off_t mediasize, ms;
  406         u_int no, sectorsize = 0;
  407 
  408         if (g_shsec_nvalid(sc) != sc->sc_ndisks)
  409                 return;
  410 
  411         sc->sc_provider = g_new_providerf(sc->sc_geom, "shsec/%s", sc->sc_name);
  412         /*
  413          * Find the smallest disk.
  414          */
  415         mediasize = sc->sc_disks[0]->provider->mediasize;
  416         mediasize -= sc->sc_disks[0]->provider->sectorsize;
  417         sectorsize = sc->sc_disks[0]->provider->sectorsize;
  418         for (no = 1; no < sc->sc_ndisks; no++) {
  419                 ms = sc->sc_disks[no]->provider->mediasize;
  420                 ms -= sc->sc_disks[no]->provider->sectorsize;
  421                 if (ms < mediasize)
  422                         mediasize = ms;
  423                 sectorsize = lcm(sectorsize,
  424                     sc->sc_disks[no]->provider->sectorsize);
  425         }
  426         sc->sc_provider->sectorsize = sectorsize;
  427         sc->sc_provider->mediasize = mediasize;
  428         g_error_provider(sc->sc_provider, 0);
  429 
  430         G_SHSEC_DEBUG(0, "Device %s activated.", sc->sc_name);
  431 }
  432 
  433 static int
  434 g_shsec_read_metadata(struct g_consumer *cp, struct g_shsec_metadata *md)
  435 {
  436         struct g_provider *pp;
  437         u_char *buf;
  438         int error;
  439 
  440         g_topology_assert();
  441 
  442         error = g_access(cp, 1, 0, 0);
  443         if (error != 0)
  444                 return (error);
  445         pp = cp->provider;
  446         g_topology_unlock();
  447         buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
  448             &error);
  449         g_topology_lock();
  450         g_access(cp, -1, 0, 0);
  451         if (buf == NULL)
  452                 return (error);
  453 
  454         /* Decode metadata. */
  455         shsec_metadata_decode(buf, md);
  456         g_free(buf);
  457 
  458         return (0);
  459 }
  460 
  461 /*
  462  * Add disk to given device.
  463  */
  464 static int
  465 g_shsec_add_disk(struct g_shsec_softc *sc, struct g_provider *pp, u_int no)
  466 {
  467         struct g_consumer *cp, *fcp;
  468         struct g_geom *gp;
  469         struct g_shsec_metadata md;
  470         int error;
  471 
  472         /* Metadata corrupted? */
  473         if (no >= sc->sc_ndisks)
  474                 return (EINVAL);
  475 
  476         /* Check if disk is not already attached. */
  477         if (sc->sc_disks[no] != NULL)
  478                 return (EEXIST);
  479 
  480         gp = sc->sc_geom;
  481         fcp = LIST_FIRST(&gp->consumer);
  482 
  483         cp = g_new_consumer(gp);
  484         error = g_attach(cp, pp);
  485         if (error != 0) {
  486                 g_destroy_consumer(cp);
  487                 return (error);
  488         }
  489 
  490         if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0)) {
  491                 error = g_access(cp, fcp->acr, fcp->acw, fcp->ace);
  492                 if (error != 0) {
  493                         g_detach(cp);
  494                         g_destroy_consumer(cp);
  495                         return (error);
  496                 }
  497         }
  498 
  499         /* Reread metadata. */
  500         error = g_shsec_read_metadata(cp, &md);
  501         if (error != 0)
  502                 goto fail;
  503 
  504         if (strcmp(md.md_magic, G_SHSEC_MAGIC) != 0 ||
  505             strcmp(md.md_name, sc->sc_name) != 0 || md.md_id != sc->sc_id) {
  506                 G_SHSEC_DEBUG(0, "Metadata on %s changed.", pp->name);
  507                 goto fail;
  508         }
  509 
  510         cp->private = sc;
  511         cp->index = no;
  512         sc->sc_disks[no] = cp;
  513 
  514         G_SHSEC_DEBUG(0, "Disk %s attached to %s.", pp->name, sc->sc_name);
  515 
  516         g_shsec_check_and_run(sc);
  517 
  518         return (0);
  519 fail:
  520         if (fcp != NULL && (fcp->acr > 0 || fcp->acw > 0 || fcp->ace > 0))
  521                 g_access(cp, -fcp->acr, -fcp->acw, -fcp->ace);
  522         g_detach(cp);
  523         g_destroy_consumer(cp);
  524         return (error);
  525 }
  526 
  527 static struct g_geom *
  528 g_shsec_create(struct g_class *mp, const struct g_shsec_metadata *md)
  529 {
  530         struct g_shsec_softc *sc;
  531         struct g_geom *gp;
  532         u_int no;
  533 
  534         G_SHSEC_DEBUG(1, "Creating device %s (id=%u).", md->md_name, md->md_id);
  535 
  536         /* Two disks is minimum. */
  537         if (md->md_all < 2) {
  538                 G_SHSEC_DEBUG(0, "Too few disks defined for %s.", md->md_name);
  539                 return (NULL);
  540         }
  541 
  542         /* Check for duplicate unit */
  543         LIST_FOREACH(gp, &mp->geom, geom) {
  544                 sc = gp->softc;
  545                 if (sc != NULL && strcmp(sc->sc_name, md->md_name) == 0) {
  546                         G_SHSEC_DEBUG(0, "Device %s already configured.",
  547                             sc->sc_name);
  548                         return (NULL);
  549                 }
  550         }
  551         gp = g_new_geomf(mp, "%s", md->md_name);
  552         sc = malloc(sizeof(*sc), M_SHSEC, M_WAITOK | M_ZERO);
  553         gp->start = g_shsec_start;
  554         gp->spoiled = g_shsec_orphan;
  555         gp->orphan = g_shsec_orphan;
  556         gp->access = g_shsec_access;
  557         gp->dumpconf = g_shsec_dumpconf;
  558 
  559         sc->sc_id = md->md_id;
  560         sc->sc_ndisks = md->md_all;
  561         sc->sc_disks = malloc(sizeof(struct g_consumer *) * sc->sc_ndisks,
  562             M_SHSEC, M_WAITOK | M_ZERO);
  563         for (no = 0; no < sc->sc_ndisks; no++)
  564                 sc->sc_disks[no] = NULL;
  565 
  566         gp->softc = sc;
  567         sc->sc_geom = gp;
  568         sc->sc_provider = NULL;
  569 
  570         G_SHSEC_DEBUG(0, "Device %s created (id=%u).", sc->sc_name, sc->sc_id);
  571 
  572         return (gp);
  573 }
  574 
  575 static int
  576 g_shsec_destroy(struct g_shsec_softc *sc, boolean_t force)
  577 {
  578         struct g_provider *pp;
  579         struct g_geom *gp;
  580         u_int no;
  581 
  582         g_topology_assert();
  583 
  584         if (sc == NULL)
  585                 return (ENXIO);
  586 
  587         pp = sc->sc_provider;
  588         if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
  589                 if (force) {
  590                         G_SHSEC_DEBUG(0, "Device %s is still open, so it "
  591                             "can't be definitely removed.", pp->name);
  592                 } else {
  593                         G_SHSEC_DEBUG(1,
  594                             "Device %s is still open (r%dw%de%d).", pp->name,
  595                             pp->acr, pp->acw, pp->ace);
  596                         return (EBUSY);
  597                 }
  598         }
  599 
  600         for (no = 0; no < sc->sc_ndisks; no++) {
  601                 if (sc->sc_disks[no] != NULL)
  602                         g_shsec_remove_disk(sc->sc_disks[no]);
  603         }
  604 
  605         gp = sc->sc_geom;
  606         gp->softc = NULL;
  607         KASSERT(sc->sc_provider == NULL, ("Provider still exists? (device=%s)",
  608             gp->name));
  609         free(sc->sc_disks, M_SHSEC);
  610         free(sc, M_SHSEC);
  611 
  612         pp = LIST_FIRST(&gp->provider);
  613         if (pp == NULL || (pp->acr == 0 && pp->acw == 0 && pp->ace == 0))
  614                 G_SHSEC_DEBUG(0, "Device %s destroyed.", gp->name);
  615 
  616         g_wither_geom(gp, ENXIO);
  617 
  618         return (0);
  619 }
  620 
  621 static int
  622 g_shsec_destroy_geom(struct gctl_req *req __unused, struct g_class *mp __unused,
  623     struct g_geom *gp)
  624 {
  625         struct g_shsec_softc *sc;
  626 
  627         sc = gp->softc;
  628         return (g_shsec_destroy(sc, 0));
  629 }
  630 
  631 static struct g_geom *
  632 g_shsec_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
  633 {
  634         struct g_shsec_metadata md;
  635         struct g_shsec_softc *sc;
  636         struct g_consumer *cp;
  637         struct g_geom *gp;
  638         int error;
  639 
  640         g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
  641         g_topology_assert();
  642 
  643         /* Skip providers that are already open for writing. */
  644         if (pp->acw > 0)
  645                 return (NULL);
  646 
  647         G_SHSEC_DEBUG(3, "Tasting %s.", pp->name);
  648 
  649         gp = g_new_geomf(mp, "shsec:taste");
  650         gp->start = g_shsec_start;
  651         gp->access = g_shsec_access;
  652         gp->orphan = g_shsec_orphan;
  653         cp = g_new_consumer(gp);
  654         cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
  655         error = g_attach(cp, pp);
  656         if (error == 0) {
  657                 error = g_shsec_read_metadata(cp, &md);
  658                 g_detach(cp);
  659         }
  660         g_destroy_consumer(cp);
  661         g_destroy_geom(gp);
  662         if (error != 0)
  663                 return (NULL);
  664         gp = NULL;
  665 
  666         if (strcmp(md.md_magic, G_SHSEC_MAGIC) != 0)
  667                 return (NULL);
  668         if (md.md_version > G_SHSEC_VERSION) {
  669                 G_SHSEC_DEBUG(0, "Kernel module is too old to handle %s.\n",
  670                     pp->name);
  671                 return (NULL);
  672         }
  673         /*
  674          * Backward compatibility:
  675          */
  676         /* There was no md_provsize field in earlier versions of metadata. */
  677         if (md.md_version < 1)
  678                 md.md_provsize = pp->mediasize;
  679 
  680         if (md.md_provider[0] != '\0' &&
  681             !g_compare_names(md.md_provider, pp->name))
  682                 return (NULL);
  683         if (md.md_provsize != pp->mediasize)
  684                 return (NULL);
  685 
  686         /*
  687          * Let's check if device already exists.
  688          */
  689         sc = NULL;
  690         LIST_FOREACH(gp, &mp->geom, geom) {
  691                 sc = gp->softc;
  692                 if (sc == NULL)
  693                         continue;
  694                 if (strcmp(md.md_name, sc->sc_name) != 0)
  695                         continue;
  696                 if (md.md_id != sc->sc_id)
  697                         continue;
  698                 break;
  699         }
  700         if (gp != NULL) {
  701                 G_SHSEC_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
  702                 error = g_shsec_add_disk(sc, pp, md.md_no);
  703                 if (error != 0) {
  704                         G_SHSEC_DEBUG(0, "Cannot add disk %s to %s (error=%d).",
  705                             pp->name, gp->name, error);
  706                         return (NULL);
  707                 }
  708         } else {
  709                 gp = g_shsec_create(mp, &md);
  710                 if (gp == NULL) {
  711                         G_SHSEC_DEBUG(0, "Cannot create device %s.", md.md_name);
  712                         return (NULL);
  713                 }
  714                 sc = gp->softc;
  715                 G_SHSEC_DEBUG(1, "Adding disk %s to %s.", pp->name, gp->name);
  716                 error = g_shsec_add_disk(sc, pp, md.md_no);
  717                 if (error != 0) {
  718                         G_SHSEC_DEBUG(0, "Cannot add disk %s to %s (error=%d).",
  719                             pp->name, gp->name, error);
  720                         g_shsec_destroy(sc, 1);
  721                         return (NULL);
  722                 }
  723         }
  724         return (gp);
  725 }
  726 
  727 static struct g_shsec_softc *
  728 g_shsec_find_device(struct g_class *mp, const char *name)
  729 {
  730         struct g_shsec_softc *sc;
  731         struct g_geom *gp;
  732 
  733         LIST_FOREACH(gp, &mp->geom, geom) {
  734                 sc = gp->softc;
  735                 if (sc == NULL)
  736                         continue;
  737                 if (strcmp(sc->sc_name, name) == 0)
  738                         return (sc);
  739         }
  740         return (NULL);
  741 }
  742 
  743 static void
  744 g_shsec_ctl_destroy(struct gctl_req *req, struct g_class *mp)
  745 {
  746         struct g_shsec_softc *sc;
  747         int *force, *nargs, error;
  748         const char *name;
  749         char param[16];
  750         u_int i;
  751 
  752         g_topology_assert();
  753 
  754         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
  755         if (nargs == NULL) {
  756                 gctl_error(req, "No '%s' argument.", "nargs");
  757                 return;
  758         }
  759         if (*nargs <= 0) {
  760                 gctl_error(req, "Missing device(s).");
  761                 return;
  762         }
  763         force = gctl_get_paraml(req, "force", sizeof(*force));
  764         if (force == NULL) {
  765                 gctl_error(req, "No '%s' argument.", "force");
  766                 return;
  767         }
  768 
  769         for (i = 0; i < (u_int)*nargs; i++) {
  770                 snprintf(param, sizeof(param), "arg%u", i);
  771                 name = gctl_get_asciiparam(req, param);
  772                 if (name == NULL) {
  773                         gctl_error(req, "No 'arg%u' argument.", i);
  774                         return;
  775                 }
  776                 sc = g_shsec_find_device(mp, name);
  777                 if (sc == NULL) {
  778                         gctl_error(req, "No such device: %s.", name);
  779                         return;
  780                 }
  781                 error = g_shsec_destroy(sc, *force);
  782                 if (error != 0) {
  783                         gctl_error(req, "Cannot destroy device %s (error=%d).",
  784                             sc->sc_name, error);
  785                         return;
  786                 }
  787         }
  788 }
  789 
  790 static void
  791 g_shsec_config(struct gctl_req *req, struct g_class *mp, const char *verb)
  792 {
  793         uint32_t *version;
  794 
  795         g_topology_assert();
  796 
  797         version = gctl_get_paraml(req, "version", sizeof(*version));
  798         if (version == NULL) {
  799                 gctl_error(req, "No '%s' argument.", "version");
  800                 return;
  801         }
  802         if (*version != G_SHSEC_VERSION) {
  803                 gctl_error(req, "Userland and kernel parts are out of sync.");
  804                 return;
  805         }
  806 
  807         if (strcmp(verb, "stop") == 0) {
  808                 g_shsec_ctl_destroy(req, mp);
  809                 return;
  810         }
  811 
  812         gctl_error(req, "Unknown verb.");
  813 }
  814 
  815 static void
  816 g_shsec_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
  817     struct g_consumer *cp, struct g_provider *pp)
  818 {
  819         struct g_shsec_softc *sc;
  820 
  821         sc = gp->softc;
  822         if (sc == NULL)
  823                 return;
  824         if (pp != NULL) {
  825                 /* Nothing here. */
  826         } else if (cp != NULL) {
  827                 sbuf_printf(sb, "%s<Number>%u</Number>\n", indent,
  828                     (u_int)cp->index);
  829         } else {
  830                 sbuf_printf(sb, "%s<ID>%u</ID>\n", indent, (u_int)sc->sc_id);
  831                 sbuf_printf(sb, "%s<Status>Total=%u, Online=%u</Status>\n",
  832                     indent, sc->sc_ndisks, g_shsec_nvalid(sc));
  833                 sbuf_printf(sb, "%s<State>", indent);
  834                 if (sc->sc_provider != NULL && sc->sc_provider->error == 0)
  835                         sbuf_printf(sb, "UP");
  836                 else
  837                         sbuf_printf(sb, "DOWN");
  838                 sbuf_printf(sb, "</State>\n");
  839         }
  840 }
  841 
  842 DECLARE_GEOM_CLASS(g_shsec_class, g_shsec);
  843 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
