sys/geom/mountver/g_mountver.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2010 Edward Tomasz Napierala <trasz@FreeBSD.org>
   5  * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include <sys/param.h>
  34 #include <sys/systm.h>
  35 #include <sys/kernel.h>
  36 #include <sys/module.h>
  37 #include <sys/lock.h>
  38 #include <sys/mutex.h>
  39 #include <sys/bio.h>
  40 #include <sys/disk.h>
  41 #include <sys/proc.h>
  42 #include <sys/sbuf.h>
  43 #include <sys/sysctl.h>
  44 #include <sys/malloc.h>
  45 #include <sys/eventhandler.h>
  46 #include <geom/geom.h>
  47 #include <geom/mountver/g_mountver.h>
  48
  49
  50 SYSCTL_DECL(_kern_geom);
  51 static SYSCTL_NODE(_kern_geom, OID_AUTO, mountver, CTLFLAG_RW,
  52     0, "GEOM_MOUNTVER stuff");
  53 static u_int g_mountver_debug = 0;
  54 static u_int g_mountver_check_ident = 1;
  55 SYSCTL_UINT(_kern_geom_mountver, OID_AUTO, debug, CTLFLAG_RW,
  56     &g_mountver_debug, 0, "Debug level");
  57 SYSCTL_UINT(_kern_geom_mountver, OID_AUTO, check_ident, CTLFLAG_RW,
  58     &g_mountver_check_ident, 0, "Check disk ident when reattaching");
  59
  60 static eventhandler_tag g_mountver_pre_sync = NULL;
  61
  62 static void g_mountver_queue(struct bio *bp);
  63 static void g_mountver_orphan(struct g_consumer *cp);
  64 static void g_mountver_resize(struct g_consumer *cp);
  65 static int g_mountver_destroy(struct g_geom *gp, boolean_t force);
  66 static g_taste_t g_mountver_taste;
  67 static int g_mountver_destroy_geom(struct gctl_req *req, struct g_class *mp,
  68     struct g_geom *gp);
  69 static void g_mountver_config(struct gctl_req *req, struct g_class *mp,
  70     const char *verb);
  71 static void g_mountver_dumpconf(struct sbuf *sb, const char *indent,
  72     struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp);
  73 static void g_mountver_init(struct g_class *mp);
  74 static void g_mountver_fini(struct g_class *mp);
  75
  76 struct g_class g_mountver_class = {
  77         .name = G_MOUNTVER_CLASS_NAME,
  78         .version = G_VERSION,
  79         .ctlreq = g_mountver_config,
  80         .taste = g_mountver_taste,
  81         .destroy_geom = g_mountver_destroy_geom,
  82         .init = g_mountver_init,
  83         .fini = g_mountver_fini
  84 };
  85
  86 static void
  87 g_mountver_done(struct bio *bp)
  88 {
  89         struct g_geom *gp;
  90         struct bio *pbp;
  91
  92         if (bp->bio_error != ENXIO) {
  93                 g_std_done(bp);
  94                 return;
  95         }
  96
  97         /*
  98          * When the device goes away, it's possible that few requests
  99          * will be completed with ENXIO before g_mountver_orphan()
 100          * gets called.  To work around that, we have to queue requests
 101          * that failed with ENXIO, in order to send them later.
 102          */
 103         gp = bp->bio_from->geom;
 104
 105         pbp = bp->bio_parent;
 106         KASSERT(pbp->bio_to == LIST_FIRST(&gp->provider),
 107             ("parent request was for someone else"));
 108         g_destroy_bio(bp);
 109         pbp->bio_inbed++;
 110         g_mountver_queue(pbp);
 111 }
 112
 113 static void
 114 g_mountver_send(struct bio *bp)
 115 {
 116         struct g_geom *gp;
 117         struct bio *cbp;
 118
 119         gp = bp->bio_to->geom;
 120
 121         cbp = g_clone_bio(bp);
 122         if (cbp == NULL) {
 123                 g_io_deliver(bp, ENOMEM);
 124                 return;
 125         }
 126
 127         cbp->bio_done = g_mountver_done;
 128         g_io_request(cbp, LIST_FIRST(&gp->consumer));
 129 }
 130
 131 static void
 132 g_mountver_queue(struct bio *bp)
 133 {
 134         struct g_mountver_softc *sc;
 135         struct g_geom *gp;
 136
 137         gp = bp->bio_to->geom;
 138         sc = gp->softc;
 139
 140         mtx_lock(&sc->sc_mtx);
 141         TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue);
 142         mtx_unlock(&sc->sc_mtx);
 143 }
 144
 145 static void
 146 g_mountver_send_queued(struct g_geom *gp)
 147 {
 148         struct g_mountver_softc *sc;
 149         struct bio *bp;
 150
 151         sc = gp->softc;
 152
 153         mtx_lock(&sc->sc_mtx);
 154         while ((bp = TAILQ_FIRST(&sc->sc_queue)) != NULL) {
 155                 TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue);
 156                 G_MOUNTVER_LOGREQ(bp, "Sending queued request.");
 157                 g_mountver_send(bp);
 158         }
 159         mtx_unlock(&sc->sc_mtx);
 160 }
 161
 162 static void
 163 g_mountver_discard_queued(struct g_geom *gp)
 164 {
 165         struct g_mountver_softc *sc;
 166         struct bio *bp;
 167
 168         sc = gp->softc;
 169
 170         mtx_lock(&sc->sc_mtx);
 171         while ((bp = TAILQ_FIRST(&sc->sc_queue)) != NULL) {
 172                 TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue);
 173                 G_MOUNTVER_LOGREQ(bp, "Discarding queued request.");
 174                 g_io_deliver(bp, ENXIO);
 175         }
 176         mtx_unlock(&sc->sc_mtx);
 177 }
 178
 179 static void
 180 g_mountver_start(struct bio *bp)
 181 {
 182         struct g_mountver_softc *sc;
 183         struct g_geom *gp;
 184
 185         gp = bp->bio_to->geom;
 186         sc = gp->softc;
 187         G_MOUNTVER_LOGREQ(bp, "Request received.");
 188
 189         /*
 190          * It is possible that some bios were returned with ENXIO, even though
 191          * orphaning didn't happen yet.  In that case, queue all subsequent
 192          * requests in order to maintain ordering.
 193          */
 194         if (sc->sc_orphaned || !TAILQ_EMPTY(&sc->sc_queue)) {
 195                 if (sc->sc_shutting_down) {
 196                         G_MOUNTVER_LOGREQ(bp, "Discarding request due to shutdown.");
 197                         g_io_deliver(bp, ENXIO);
 198                         return;
 199                 }
 200                 G_MOUNTVER_LOGREQ(bp, "Queueing request.");
 201                 g_mountver_queue(bp);
 202                 if (!sc->sc_orphaned)
 203                         g_mountver_send_queued(gp);
 204         } else {
 205                 G_MOUNTVER_LOGREQ(bp, "Sending request.");
 206                 g_mountver_send(bp);
 207         }
 208 }
 209
 210 static int
 211 g_mountver_access(struct g_provider *pp, int dr, int dw, int de)
 212 {
 213         struct g_mountver_softc *sc;
 214         struct g_geom *gp;
 215         struct g_consumer *cp;
 216
 217         g_topology_assert();
 218
 219         gp = pp->geom;
 220         cp = LIST_FIRST(&gp->consumer);
 221         sc = gp->softc;
 222         if (sc == NULL && dr <= 0 && dw <= 0 && de <= 0)
 223                 return (0);
 224         KASSERT(sc != NULL, ("Trying to access withered provider \"%s\".", pp->name));
 225
 226         sc->sc_access_r += dr;
 227         sc->sc_access_w += dw;
 228         sc->sc_access_e += de;
 229
 230         if (sc->sc_orphaned)
 231                 return (0);
 232
 233         return (g_access(cp, dr, dw, de));
 234 }
 235
 236 static int
 237 g_mountver_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp)
 238 {
 239         struct g_mountver_softc *sc;
 240         struct g_geom *gp;
 241         struct g_provider *newpp;
 242         struct g_consumer *cp;
 243         char name[64];
 244         int error;
 245         int identsize = DISK_IDENT_SIZE;
 246
 247         g_topology_assert();
 248
 249         gp = NULL;
 250         newpp = NULL;
 251         cp = NULL;
 252
 253         snprintf(name, sizeof(name), "%s%s", pp->name, G_MOUNTVER_SUFFIX);
 254         LIST_FOREACH(gp, &mp->geom, geom) {
 255                 if (strcmp(gp->name, name) == 0) {
 256                         gctl_error(req, "Provider %s already exists.", name);
 257                         return (EEXIST);
 258                 }
 259         }
 260         gp = g_new_geomf(mp, "%s", name);
 261         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
 262         mtx_init(&sc->sc_mtx, "gmountver", NULL, MTX_DEF | MTX_RECURSE);
 263         TAILQ_INIT(&sc->sc_queue);
 264         sc->sc_provider_name = strdup(pp->name, M_GEOM);
 265         gp->softc = sc;
 266         gp->start = g_mountver_start;
 267         gp->orphan = g_mountver_orphan;
 268         gp->resize = g_mountver_resize;
 269         gp->access = g_mountver_access;
 270         gp->dumpconf = g_mountver_dumpconf;
 271
 272         newpp = g_new_providerf(gp, "%s", gp->name);
 273         newpp->mediasize = pp->mediasize;
 274         newpp->sectorsize = pp->sectorsize;
 275         newpp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE;
 276
 277         if ((pp->flags & G_PF_ACCEPT_UNMAPPED) != 0) {
 278                 G_MOUNTVER_DEBUG(0, "Unmapped supported for %s.", gp->name);
 279                 newpp->flags |= G_PF_ACCEPT_UNMAPPED;
 280         } else {
 281                 G_MOUNTVER_DEBUG(0, "Unmapped unsupported for %s.", gp->name);
 282                 newpp->flags &= ~G_PF_ACCEPT_UNMAPPED;
 283         }
 284
 285         cp = g_new_consumer(gp);
 286         cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
 287         error = g_attach(cp, pp);
 288         if (error != 0) {
 289                 gctl_error(req, "Cannot attach to provider %s.", pp->name);
 290                 goto fail;
 291         }
 292         error = g_access(cp, 1, 0, 0);
 293         if (error != 0) {
 294                 gctl_error(req, "Cannot access provider %s.", pp->name);
 295                 goto fail;
 296         }
 297         error = g_io_getattr("GEOM::ident", cp, &identsize, sc->sc_ident);
 298         g_access(cp, -1, 0, 0);
 299         if (error != 0) {
 300                 if (g_mountver_check_ident) {
 301                         gctl_error(req, "Cannot get disk ident from %s; error = %d.", pp->name, error);
 302                         goto fail;
 303                 }
 304
 305                 G_MOUNTVER_DEBUG(0, "Cannot get disk ident from %s; error = %d.", pp->name, error);
 306                 sc->sc_ident[0] = '\0';
 307         }
 308
 309         g_error_provider(newpp, 0);
 310         G_MOUNTVER_DEBUG(0, "Device %s created.", gp->name);
 311         return (0);
 312 fail:
 313         g_free(sc->sc_provider_name);
 314         if (cp->provider != NULL)
 315                 g_detach(cp);
 316         g_destroy_consumer(cp);
 317         g_destroy_provider(newpp);
 318         g_free(gp->softc);
 319         g_destroy_geom(gp);
 320         return (error);
 321 }
 322
 323 static int
 324 g_mountver_destroy(struct g_geom *gp, boolean_t force)
 325 {
 326         struct g_mountver_softc *sc;
 327         struct g_provider *pp;
 328
 329         g_topology_assert();
 330         if (gp->softc == NULL)
 331                 return (ENXIO);
 332         sc = gp->softc;
 333         pp = LIST_FIRST(&gp->provider);
 334         if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
 335                 if (force) {
 336                         G_MOUNTVER_DEBUG(0, "Device %s is still open, so it "
 337                             "can't be definitely removed.", pp->name);
 338                 } else {
 339                         G_MOUNTVER_DEBUG(1, "Device %s is still open (r%dw%de%d).",
 340                             pp->name, pp->acr, pp->acw, pp->ace);
 341                         return (EBUSY);
 342                 }
 343         } else {
 344                 G_MOUNTVER_DEBUG(0, "Device %s removed.", gp->name);
 345         }
 346         if (pp != NULL)
 347                 g_wither_provider(pp, ENXIO);
 348         g_mountver_discard_queued(gp);
 349         g_free(sc->sc_provider_name);
 350         g_free(gp->softc);
 351         gp->softc = NULL;
 352         g_wither_geom(gp, ENXIO);
 353
 354         return (0);
 355 }
 356
 357 static int
 358 g_mountver_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
 359 {
 360
 361         return (g_mountver_destroy(gp, 0));
 362 }
 363
 364 static void
 365 g_mountver_ctl_create(struct gctl_req *req, struct g_class *mp)
 366 {
 367         struct g_provider *pp;
 368         const char *name;
 369         char param[16];
 370         int i, *nargs;
 371
 372         g_topology_assert();
 373
 374         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
 375         if (nargs == NULL) {
 376                 gctl_error(req, "No '%s' argument", "nargs");
 377                 return;
 378         }
 379         if (*nargs <= 0) {
 380                 gctl_error(req, "Missing device(s).");
 381                 return;
 382         }
 383         for (i = 0; i < *nargs; i++) {
 384                 snprintf(param, sizeof(param), "arg%d", i);
 385                 name = gctl_get_asciiparam(req, param);
 386                 if (name == NULL) {
 387                         gctl_error(req, "No 'arg%d' argument", i);
 388                         return;
 389                 }
 390                 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
 391                         name += strlen("/dev/");
 392                 pp = g_provider_by_name(name);
 393                 if (pp == NULL) {
 394                         G_MOUNTVER_DEBUG(1, "Provider %s is invalid.", name);
 395                         gctl_error(req, "Provider %s is invalid.", name);
 396                         return;
 397                 }
 398                 if (g_mountver_create(req, mp, pp) != 0)
 399                         return;
 400         }
 401 }
 402
 403 static struct g_geom *
 404 g_mountver_find_geom(struct g_class *mp, const char *name)
 405 {
 406         struct g_geom *gp;
 407
 408         LIST_FOREACH(gp, &mp->geom, geom) {
 409                 if (strcmp(gp->name, name) == 0)
 410                         return (gp);
 411         }
 412         return (NULL);
 413 }
 414
 415 static void
 416 g_mountver_ctl_destroy(struct gctl_req *req, struct g_class *mp)
 417 {
 418         int *nargs, *force, error, i;
 419         struct g_geom *gp;
 420         const char *name;
 421         char param[16];
 422
 423         g_topology_assert();
 424
 425         nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
 426         if (nargs == NULL) {
 427                 gctl_error(req, "No '%s' argument", "nargs");
 428                 return;
 429         }
 430         if (*nargs <= 0) {
 431                 gctl_error(req, "Missing device(s).");
 432                 return;
 433         }
 434         force = gctl_get_paraml(req, "force", sizeof(*force));
 435         if (force == NULL) {
 436                 gctl_error(req, "No 'force' argument");
 437                 return;
 438         }
 439
 440         for (i = 0; i < *nargs; i++) {
 441                 snprintf(param, sizeof(param), "arg%d", i);
 442                 name = gctl_get_asciiparam(req, param);
 443                 if (name == NULL) {
 444                         gctl_error(req, "No 'arg%d' argument", i);
 445                         return;
 446                 }
 447                 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
 448                         name += strlen("/dev/");
 449                 gp = g_mountver_find_geom(mp, name);
 450                 if (gp == NULL) {
 451                         G_MOUNTVER_DEBUG(1, "Device %s is invalid.", name);
 452                         gctl_error(req, "Device %s is invalid.", name);
 453                         return;
 454                 }
 455                 error = g_mountver_destroy(gp, *force);
 456                 if (error != 0) {
 457                         gctl_error(req, "Cannot destroy device %s (error=%d).",
 458                             gp->name, error);
 459                         return;
 460                 }
 461         }
 462 }
 463
 464 static void
 465 g_mountver_orphan(struct g_consumer *cp)
 466 {
 467         struct g_mountver_softc *sc;
 468
 469         g_topology_assert();
 470
 471         sc = cp->geom->softc;
 472         sc->sc_orphaned = 1;
 473         if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
 474                 g_access(cp, -cp->acr, -cp->acw, -cp->ace);
 475         g_detach(cp);
 476         G_MOUNTVER_DEBUG(0, "%s is offline.  Mount verification in progress.", sc->sc_provider_name);
 477 }
 478
 479 static void
 480 g_mountver_resize(struct g_consumer *cp)
 481 {
 482         struct g_geom *gp;
 483         struct g_provider *pp;
 484
 485         gp = cp->geom;
 486
 487         LIST_FOREACH(pp, &gp->provider, provider)
 488                 g_resize_provider(pp, cp->provider->mediasize);
 489 }
 490
 491 static int
 492 g_mountver_ident_matches(struct g_geom *gp)
 493 {
 494         struct g_consumer *cp;
 495         struct g_mountver_softc *sc;
 496         char ident[DISK_IDENT_SIZE];
 497         int error, identsize = DISK_IDENT_SIZE;
 498
 499         sc = gp->softc;
 500         cp = LIST_FIRST(&gp->consumer);
 501
 502         if (g_mountver_check_ident == 0)
 503                 return (0);
 504
 505         error = g_access(cp, 1, 0, 0);
 506         if (error != 0) {
 507                 G_MOUNTVER_DEBUG(0, "Cannot access %s; "
 508                     "not attaching; error = %d.", gp->name, error);
 509                 return (1);
 510         }
 511         error = g_io_getattr("GEOM::ident", cp, &identsize, ident);
 512         g_access(cp, -1, 0, 0);
 513         if (error != 0) {
 514                 G_MOUNTVER_DEBUG(0, "Cannot get disk ident for %s; "
 515                     "not attaching; error = %d.", gp->name, error);
 516                 return (1);
 517         }
 518         if (strcmp(ident, sc->sc_ident) != 0) {
 519                 G_MOUNTVER_DEBUG(1, "Disk ident for %s (\"%s\") is different "
 520                     "from expected \"%s\", not attaching.", gp->name, ident,
 521                     sc->sc_ident);
 522                 return (1);
 523         }
 524
 525         return (0);
 526 }
 527
 528 static struct g_geom *
 529 g_mountver_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
 530 {
 531         struct g_mountver_softc *sc;
 532         struct g_consumer *cp;
 533         struct g_geom *gp;
 534         int error;
 535
 536         g_topology_assert();
 537         g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
 538         G_MOUNTVER_DEBUG(2, "Tasting %s.", pp->name);
 539
 540         /*
 541          * Let's check if device already exists.
 542          */
 543         LIST_FOREACH(gp, &mp->geom, geom) {
 544                 sc = gp->softc;
 545                 if (sc == NULL)
 546                         continue;
 547
 548                 /* Already attached? */
 549                 if (pp == LIST_FIRST(&gp->provider))
 550                         return (NULL);
 551
 552                 if (sc->sc_orphaned && strcmp(pp->name, sc->sc_provider_name) == 0)
 553                         break;
 554         }
 555         if (gp == NULL)
 556                 return (NULL);
 557
 558         cp = LIST_FIRST(&gp->consumer);
 559         g_attach(cp, pp);
 560         error = g_mountver_ident_matches(gp);
 561         if (error != 0) {
 562                 g_detach(cp);
 563                 return (NULL);
 564         }
 565         if (sc->sc_access_r > 0 || sc->sc_access_w > 0 || sc->sc_access_e > 0) {
 566                 error = g_access(cp, sc->sc_access_r, sc->sc_access_w, sc->sc_access_e);
 567                 if (error != 0) {
 568                         G_MOUNTVER_DEBUG(0, "Cannot access %s; error = %d.", pp->name, error);
 569                         g_detach(cp);
 570                         return (NULL);
 571                 }
 572         }
 573         g_mountver_send_queued(gp);
 574         sc->sc_orphaned = 0;
 575         G_MOUNTVER_DEBUG(0, "%s has completed mount verification.", sc->sc_provider_name);
 576
 577         return (gp);
 578 }
 579
 580 static void
 581 g_mountver_config(struct gctl_req *req, struct g_class *mp, const char *verb)
 582 {
 583         uint32_t *version;
 584
 585         g_topology_assert();
 586
 587         version = gctl_get_paraml(req, "version", sizeof(*version));
 588         if (version == NULL) {
 589                 gctl_error(req, "No '%s' argument.", "version");
 590                 return;
 591         }
 592         if (*version != G_MOUNTVER_VERSION) {
 593                 gctl_error(req, "Userland and kernel parts are out of sync.");
 594                 return;
 595         }
 596
 597         if (strcmp(verb, "create") == 0) {
 598                 g_mountver_ctl_create(req, mp);
 599                 return;
 600         } else if (strcmp(verb, "destroy") == 0) {
 601                 g_mountver_ctl_destroy(req, mp);
 602                 return;
 603         }
 604
 605         gctl_error(req, "Unknown verb.");
 606 }
 607
 608 static void
 609 g_mountver_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
 610     struct g_consumer *cp, struct g_provider *pp)
 611 {
 612         struct g_mountver_softc *sc;
 613
 614         if (pp != NULL || cp != NULL)
 615                 return;
 616
 617         sc = gp->softc;
 618         sbuf_printf(sb, "%s<State>%s</State>\n", indent,
 619             sc->sc_orphaned ? "OFFLINE" : "ONLINE");
 620         sbuf_printf(sb, "%s<Provider-Name>%s</Provider-Name>\n", indent, sc->sc_provider_name);
 621         sbuf_printf(sb, "%s<Disk-Ident>%s</Disk-Ident>\n", indent, sc->sc_ident);
 622 }
 623
 624 static void
 625 g_mountver_shutdown_pre_sync(void *arg, int howto)
 626 {
 627         struct g_mountver_softc *sc;
 628         struct g_class *mp;
 629         struct g_geom *gp, *gp2;
 630
 631         mp = arg;
 632         g_topology_lock();
 633         LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) {
 634                 if (gp->softc == NULL)
 635                         continue;
 636                 sc = gp->softc;
 637                 sc->sc_shutting_down = 1;
 638                 if (sc->sc_orphaned)
 639                         g_mountver_destroy(gp, 1);
 640         }
 641         g_topology_unlock();
 642 }
 643
 644 static void
 645 g_mountver_init(struct g_class *mp)
 646 {
 647
 648         g_mountver_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync,
 649             g_mountver_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST);
 650         if (g_mountver_pre_sync == NULL)
 651                 G_MOUNTVER_DEBUG(0, "Warning! Cannot register shutdown event.");
 652 }
 653
 654 static void
 655 g_mountver_fini(struct g_class *mp)
 656 {
 657
 658         if (g_mountver_pre_sync != NULL)
 659                 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_mountver_pre_sync);
 660 }
 661
 662 DECLARE_GEOM_CLASS(g_mountver_class, g_mountver);
 663 MODULE_VERSION(geom_mountver, 0);