1/*- 2 * Copyright (c) 2010 Edward Tomasz Napierala <trasz@FreeBSD.org> 3 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28#include <sys/cdefs.h> 29__FBSDID("$FreeBSD: stable/11/sys/geom/mountver/g_mountver.c 356585 2020-01-10 00:46:59Z mav $"); 30 31#include <sys/param.h> 32#include <sys/systm.h> 33#include <sys/kernel.h> 34#include <sys/module.h> 35#include <sys/lock.h> 36#include <sys/mutex.h> 37#include <sys/bio.h> 38#include <sys/disk.h> 39#include <sys/proc.h> 40#include <sys/sbuf.h> 41#include <sys/sysctl.h> 42#include <sys/malloc.h> 43#include <sys/eventhandler.h> 44#include <geom/geom.h> 45#include <geom/mountver/g_mountver.h> 46 47 48SYSCTL_DECL(_kern_geom); 49static SYSCTL_NODE(_kern_geom, OID_AUTO, mountver, CTLFLAG_RW, 50 0, "GEOM_MOUNTVER stuff"); 51static u_int g_mountver_debug = 0; 52static u_int g_mountver_check_ident = 1; 53SYSCTL_UINT(_kern_geom_mountver, OID_AUTO, debug, CTLFLAG_RW, 54 &g_mountver_debug, 0, "Debug level"); 55SYSCTL_UINT(_kern_geom_mountver, OID_AUTO, check_ident, CTLFLAG_RW, 56 &g_mountver_check_ident, 0, "Check disk ident when reattaching"); 57 58static eventhandler_tag g_mountver_pre_sync = NULL; 59 60static void g_mountver_queue(struct bio *bp); 61static void g_mountver_orphan(struct g_consumer *cp); 62static void g_mountver_resize(struct g_consumer *cp); 63static int g_mountver_destroy(struct g_geom *gp, boolean_t force); 64static g_taste_t g_mountver_taste; 65static int g_mountver_destroy_geom(struct gctl_req *req, struct g_class *mp, 66 struct g_geom *gp); 67static void g_mountver_config(struct gctl_req *req, struct g_class *mp, 68 const char *verb); 69static void g_mountver_dumpconf(struct sbuf *sb, const char *indent, 70 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 71static void g_mountver_init(struct g_class *mp); 72static void g_mountver_fini(struct g_class *mp); 73 74struct g_class g_mountver_class = { 75 .name = G_MOUNTVER_CLASS_NAME, 76 .version = G_VERSION, 77 .ctlreq = g_mountver_config, 78 .taste = g_mountver_taste, 79 .destroy_geom = g_mountver_destroy_geom, 80 .init = g_mountver_init, 81 .fini = g_mountver_fini 82}; 83 84static void 85g_mountver_detach(void *arg, int flags __unused) 86{ 87 struct g_consumer *cp = arg; 88 89 g_topology_assert(); 90 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 91 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 92 g_detach(cp); 93} 94 95static void 96g_mountver_done(struct bio *bp) 97{ 98 struct g_mountver_softc *sc; 99 struct g_geom *gp; 100 struct g_consumer *cp; 101 struct bio *pbp; 102 103 cp = bp->bio_from; 104 gp = cp->geom; 105 if (bp->bio_error != ENXIO) { 106 g_std_done(bp); 107 goto done; 108 } 109 110 /* 111 * When the device goes away, it's possible that few requests 112 * will be completed with ENXIO before g_mountver_orphan() 113 * gets called. To work around that, we have to queue requests 114 * that failed with ENXIO, in order to send them later. 115 */ 116 pbp = bp->bio_parent; 117 KASSERT(pbp->bio_to == LIST_FIRST(&gp->provider), 118 ("parent request was for someone else")); 119 g_destroy_bio(bp); 120 pbp->bio_inbed++; 121 g_mountver_queue(pbp); 122 123done: 124 sc = gp->softc; 125 mtx_lock(&sc->sc_mtx); 126 if (--cp->index == 0 && sc->sc_orphaned) 127 g_post_event(g_mountver_detach, cp, M_NOWAIT, NULL); 128 mtx_unlock(&sc->sc_mtx); 129} 130 131/* 132 * Send the BIO down. The function is called with sc_mtx held to cover 133 * the race with orphan, but drops it before external calls. 134 */ 135static void 136g_mountver_send(struct g_geom *gp, struct bio *bp) 137{ 138 struct g_mountver_softc *sc = gp->softc; 139 struct g_consumer *cp; 140 struct bio *cbp; 141 142 mtx_assert(&sc->sc_mtx, MA_OWNED); 143 cbp = g_clone_bio(bp); 144 if (cbp == NULL) { 145 mtx_unlock(&sc->sc_mtx); 146 g_io_deliver(bp, ENOMEM); 147 return; 148 } 149 cp = LIST_FIRST(&gp->consumer); 150 cp->index++; 151 mtx_unlock(&sc->sc_mtx); 152 153 cbp->bio_done = g_mountver_done; 154 g_io_request(cbp, cp); 155} 156 157static void 158g_mountver_queue(struct bio *bp) 159{ 160 struct g_mountver_softc *sc; 161 struct g_geom *gp; 162 163 gp = bp->bio_to->geom; 164 sc = gp->softc; 165 166 mtx_lock(&sc->sc_mtx); 167 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); 168 mtx_unlock(&sc->sc_mtx); 169} 170 171static void 172g_mountver_send_queued(struct g_geom *gp) 173{ 174 struct g_mountver_softc *sc; 175 struct bio *bp; 176 177 sc = gp->softc; 178 179 mtx_lock(&sc->sc_mtx); 180 while ((bp = TAILQ_FIRST(&sc->sc_queue)) != NULL && !sc->sc_orphaned) { 181 TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue); 182 G_MOUNTVER_LOGREQ(bp, "Sending queued request."); 183 /* sc_mtx is dropped inside */ 184 g_mountver_send(gp, bp); 185 mtx_lock(&sc->sc_mtx); 186 } 187 mtx_unlock(&sc->sc_mtx); 188} 189 190static void 191g_mountver_discard_queued(struct g_geom *gp) 192{ 193 struct g_mountver_softc *sc; 194 struct bio *bp; 195 196 sc = gp->softc; 197 198 mtx_lock(&sc->sc_mtx); 199 while ((bp = TAILQ_FIRST(&sc->sc_queue)) != NULL) { 200 TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue); 201 mtx_unlock(&sc->sc_mtx); 202 G_MOUNTVER_LOGREQ(bp, "Discarding queued request."); 203 g_io_deliver(bp, ENXIO); 204 mtx_lock(&sc->sc_mtx); 205 } 206 mtx_unlock(&sc->sc_mtx); 207} 208 209static void 210g_mountver_start(struct bio *bp) 211{ 212 struct g_mountver_softc *sc; 213 struct g_geom *gp; 214 215 gp = bp->bio_to->geom; 216 sc = gp->softc; 217 G_MOUNTVER_LOGREQ(bp, "Request received."); 218 219 /* 220 * It is possible that some bios were returned with ENXIO, even though 221 * orphaning didn't happen yet. In that case, queue all subsequent 222 * requests in order to maintain ordering. 223 */ 224 mtx_lock(&sc->sc_mtx); 225 if (sc->sc_orphaned || !TAILQ_EMPTY(&sc->sc_queue)) { 226 mtx_unlock(&sc->sc_mtx); 227 if (sc->sc_shutting_down) { 228 G_MOUNTVER_LOGREQ(bp, "Discarding request due to shutdown."); 229 g_io_deliver(bp, ENXIO); 230 return; 231 } 232 G_MOUNTVER_LOGREQ(bp, "Queueing request."); 233 g_mountver_queue(bp); 234 if (!sc->sc_orphaned) 235 g_mountver_send_queued(gp); 236 } else { 237 G_MOUNTVER_LOGREQ(bp, "Sending request."); 238 /* sc_mtx is dropped inside */ 239 g_mountver_send(gp, bp); 240 } 241} 242 243static int 244g_mountver_access(struct g_provider *pp, int dr, int dw, int de) 245{ 246 struct g_mountver_softc *sc; 247 struct g_geom *gp; 248 struct g_consumer *cp; 249 250 g_topology_assert(); 251 252 gp = pp->geom; 253 cp = LIST_FIRST(&gp->consumer); 254 sc = gp->softc; 255 if (sc == NULL && dr <= 0 && dw <= 0 && de <= 0) 256 return (0); 257 KASSERT(sc != NULL, ("Trying to access withered provider \"%s\".", pp->name)); 258 259 sc->sc_access_r += dr; 260 sc->sc_access_w += dw; 261 sc->sc_access_e += de; 262 263 if (sc->sc_orphaned) 264 return (0); 265 266 return (g_access(cp, dr, dw, de)); 267} 268 269static int 270g_mountver_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp) 271{ 272 struct g_mountver_softc *sc; 273 struct g_geom *gp; 274 struct g_provider *newpp; 275 struct g_consumer *cp; 276 char name[64]; 277 int error; 278 int identsize = DISK_IDENT_SIZE; 279 280 g_topology_assert(); 281 282 gp = NULL; 283 newpp = NULL; 284 cp = NULL; 285 286 snprintf(name, sizeof(name), "%s%s", pp->name, G_MOUNTVER_SUFFIX); 287 LIST_FOREACH(gp, &mp->geom, geom) { 288 if (strcmp(gp->name, name) == 0) { 289 gctl_error(req, "Provider %s already exists.", name); 290 return (EEXIST); 291 } 292 } 293 gp = g_new_geomf(mp, "%s", name); 294 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 295 mtx_init(&sc->sc_mtx, "gmountver", NULL, MTX_DEF | MTX_RECURSE); 296 TAILQ_INIT(&sc->sc_queue); 297 sc->sc_provider_name = strdup(pp->name, M_GEOM); 298 gp->softc = sc; 299 gp->start = g_mountver_start; 300 gp->orphan = g_mountver_orphan; 301 gp->resize = g_mountver_resize; 302 gp->access = g_mountver_access; 303 gp->dumpconf = g_mountver_dumpconf; 304 305 newpp = g_new_providerf(gp, "%s", gp->name); 306 newpp->mediasize = pp->mediasize; 307 newpp->sectorsize = pp->sectorsize; 308 newpp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 309 310 if ((pp->flags & G_PF_ACCEPT_UNMAPPED) != 0) { 311 G_MOUNTVER_DEBUG(0, "Unmapped supported for %s.", gp->name); 312 newpp->flags |= G_PF_ACCEPT_UNMAPPED; 313 } else { 314 G_MOUNTVER_DEBUG(0, "Unmapped unsupported for %s.", gp->name); 315 newpp->flags &= ~G_PF_ACCEPT_UNMAPPED; 316 } 317 318 cp = g_new_consumer(gp); 319 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 320 error = g_attach(cp, pp); 321 if (error != 0) { 322 gctl_error(req, "Cannot attach to provider %s.", pp->name); 323 goto fail; 324 } 325 error = g_access(cp, 1, 0, 0); 326 if (error != 0) { 327 gctl_error(req, "Cannot access provider %s.", pp->name); 328 goto fail; 329 } 330 error = g_io_getattr("GEOM::ident", cp, &identsize, sc->sc_ident); 331 g_access(cp, -1, 0, 0); 332 if (error != 0) { 333 if (g_mountver_check_ident) { 334 gctl_error(req, "Cannot get disk ident from %s; error = %d.", pp->name, error); 335 goto fail; 336 } 337 338 G_MOUNTVER_DEBUG(0, "Cannot get disk ident from %s; error = %d.", pp->name, error); 339 sc->sc_ident[0] = '\0'; 340 } 341 342 g_error_provider(newpp, 0); 343 G_MOUNTVER_DEBUG(0, "Device %s created.", gp->name); 344 return (0); 345fail: 346 g_free(sc->sc_provider_name); 347 if (cp->provider != NULL) 348 g_detach(cp); 349 g_destroy_consumer(cp); 350 g_destroy_provider(newpp); 351 g_free(gp->softc); 352 g_destroy_geom(gp); 353 return (error); 354} 355 356static int 357g_mountver_destroy(struct g_geom *gp, boolean_t force) 358{ 359 struct g_mountver_softc *sc; 360 struct g_provider *pp; 361 362 g_topology_assert(); 363 if (gp->softc == NULL) 364 return (ENXIO); 365 sc = gp->softc; 366 pp = LIST_FIRST(&gp->provider); 367 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 368 if (force) { 369 G_MOUNTVER_DEBUG(0, "Device %s is still open, so it " 370 "can't be definitely removed.", pp->name); 371 } else { 372 G_MOUNTVER_DEBUG(1, "Device %s is still open (r%dw%de%d).", 373 pp->name, pp->acr, pp->acw, pp->ace); 374 return (EBUSY); 375 } 376 } else { 377 G_MOUNTVER_DEBUG(0, "Device %s removed.", gp->name); 378 } 379 if (pp != NULL) 380 g_wither_provider(pp, ENXIO); 381 g_mountver_discard_queued(gp); 382 g_free(sc->sc_provider_name); 383 g_free(gp->softc); 384 gp->softc = NULL; 385 g_wither_geom(gp, ENXIO); 386 387 return (0); 388} 389 390static int 391g_mountver_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp) 392{ 393 394 return (g_mountver_destroy(gp, 0)); 395} 396 397static void 398g_mountver_ctl_create(struct gctl_req *req, struct g_class *mp) 399{ 400 struct g_provider *pp; 401 const char *name; 402 char param[16]; 403 int i, *nargs; 404 405 g_topology_assert(); 406 407 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 408 if (nargs == NULL) { 409 gctl_error(req, "No '%s' argument", "nargs"); 410 return; 411 } 412 if (*nargs <= 0) { 413 gctl_error(req, "Missing device(s)."); 414 return; 415 } 416 for (i = 0; i < *nargs; i++) { 417 snprintf(param, sizeof(param), "arg%d", i); 418 name = gctl_get_asciiparam(req, param); 419 if (name == NULL) { 420 gctl_error(req, "No 'arg%d' argument", i); 421 return; 422 } 423 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 424 name += strlen("/dev/"); 425 pp = g_provider_by_name(name); 426 if (pp == NULL) { 427 G_MOUNTVER_DEBUG(1, "Provider %s is invalid.", name); 428 gctl_error(req, "Provider %s is invalid.", name); 429 return; 430 } 431 if (g_mountver_create(req, mp, pp) != 0) 432 return; 433 } 434} 435 436static struct g_geom * 437g_mountver_find_geom(struct g_class *mp, const char *name) 438{ 439 struct g_geom *gp; 440 441 LIST_FOREACH(gp, &mp->geom, geom) { 442 if (strcmp(gp->name, name) == 0) 443 return (gp); 444 } 445 return (NULL); 446} 447 448static void 449g_mountver_ctl_destroy(struct gctl_req *req, struct g_class *mp) 450{ 451 int *nargs, *force, error, i; 452 struct g_geom *gp; 453 const char *name; 454 char param[16]; 455 456 g_topology_assert(); 457 458 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 459 if (nargs == NULL) { 460 gctl_error(req, "No '%s' argument", "nargs"); 461 return; 462 } 463 if (*nargs <= 0) { 464 gctl_error(req, "Missing device(s)."); 465 return; 466 } 467 force = gctl_get_paraml(req, "force", sizeof(*force)); 468 if (force == NULL) { 469 gctl_error(req, "No 'force' argument"); 470 return; 471 } 472 473 for (i = 0; i < *nargs; i++) { 474 snprintf(param, sizeof(param), "arg%d", i); 475 name = gctl_get_asciiparam(req, param); 476 if (name == NULL) { 477 gctl_error(req, "No 'arg%d' argument", i); 478 return; 479 } 480 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 481 name += strlen("/dev/"); 482 gp = g_mountver_find_geom(mp, name); 483 if (gp == NULL) { 484 G_MOUNTVER_DEBUG(1, "Device %s is invalid.", name); 485 gctl_error(req, "Device %s is invalid.", name); 486 return; 487 } 488 error = g_mountver_destroy(gp, *force); 489 if (error != 0) { 490 gctl_error(req, "Cannot destroy device %s (error=%d).", 491 gp->name, error); 492 return; 493 } 494 } 495} 496 497static void 498g_mountver_orphan(struct g_consumer *cp) 499{ 500 struct g_mountver_softc *sc; 501 int done; 502 503 g_topology_assert(); 504 505 sc = cp->geom->softc; 506 mtx_lock(&sc->sc_mtx); 507 sc->sc_orphaned = 1; 508 done = (cp->index == 0); 509 mtx_unlock(&sc->sc_mtx); 510 if (done) 511 g_mountver_detach(cp, 0); 512 G_MOUNTVER_DEBUG(0, "%s is offline. Mount verification in progress.", sc->sc_provider_name); 513} 514 515static void 516g_mountver_resize(struct g_consumer *cp) 517{ 518 struct g_geom *gp; 519 struct g_provider *pp; 520 521 gp = cp->geom; 522 523 LIST_FOREACH(pp, &gp->provider, provider) 524 g_resize_provider(pp, cp->provider->mediasize); 525} 526 527static int 528g_mountver_ident_matches(struct g_geom *gp) 529{ 530 struct g_consumer *cp; 531 struct g_mountver_softc *sc; 532 char ident[DISK_IDENT_SIZE]; 533 int error, identsize = DISK_IDENT_SIZE; 534 535 sc = gp->softc; 536 cp = LIST_FIRST(&gp->consumer); 537 538 if (g_mountver_check_ident == 0) 539 return (0); 540 541 error = g_access(cp, 1, 0, 0); 542 if (error != 0) { 543 G_MOUNTVER_DEBUG(0, "Cannot access %s; " 544 "not attaching; error = %d.", gp->name, error); 545 return (1); 546 } 547 error = g_io_getattr("GEOM::ident", cp, &identsize, ident); 548 g_access(cp, -1, 0, 0); 549 if (error != 0) { 550 G_MOUNTVER_DEBUG(0, "Cannot get disk ident for %s; " 551 "not attaching; error = %d.", gp->name, error); 552 return (1); 553 } 554 if (strcmp(ident, sc->sc_ident) != 0) { 555 G_MOUNTVER_DEBUG(1, "Disk ident for %s (\"%s\") is different " 556 "from expected \"%s\", not attaching.", gp->name, ident, 557 sc->sc_ident); 558 return (1); 559 } 560 561 return (0); 562} 563 564static struct g_geom * 565g_mountver_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 566{ 567 struct g_mountver_softc *sc; 568 struct g_consumer *cp; 569 struct g_geom *gp; 570 int error; 571 572 g_topology_assert(); 573 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 574 G_MOUNTVER_DEBUG(2, "Tasting %s.", pp->name); 575 576 /* 577 * Let's check if device already exists. 578 */ 579 LIST_FOREACH(gp, &mp->geom, geom) { 580 sc = gp->softc; 581 if (sc == NULL) 582 continue; 583 584 /* Already attached? */ 585 if (pp == LIST_FIRST(&gp->provider)) 586 return (NULL); 587 588 if (sc->sc_orphaned && strcmp(pp->name, sc->sc_provider_name) == 0) 589 break; 590 } 591 if (gp == NULL) 592 return (NULL); 593 594 cp = LIST_FIRST(&gp->consumer); 595 g_attach(cp, pp); 596 error = g_mountver_ident_matches(gp); 597 if (error != 0) { 598 g_detach(cp); 599 return (NULL); 600 } 601 if (sc->sc_access_r > 0 || sc->sc_access_w > 0 || sc->sc_access_e > 0) { 602 error = g_access(cp, sc->sc_access_r, sc->sc_access_w, sc->sc_access_e); 603 if (error != 0) { 604 G_MOUNTVER_DEBUG(0, "Cannot access %s; error = %d.", pp->name, error); 605 g_detach(cp); 606 return (NULL); 607 } 608 } 609 sc->sc_orphaned = 0; 610 g_mountver_send_queued(gp); 611 G_MOUNTVER_DEBUG(0, "%s has completed mount verification.", sc->sc_provider_name); 612 613 return (gp); 614} 615 616static void 617g_mountver_config(struct gctl_req *req, struct g_class *mp, const char *verb) 618{ 619 uint32_t *version; 620 621 g_topology_assert(); 622 623 version = gctl_get_paraml(req, "version", sizeof(*version)); 624 if (version == NULL) { 625 gctl_error(req, "No '%s' argument.", "version"); 626 return; 627 } 628 if (*version != G_MOUNTVER_VERSION) { 629 gctl_error(req, "Userland and kernel parts are out of sync."); 630 return; 631 } 632 633 if (strcmp(verb, "create") == 0) { 634 g_mountver_ctl_create(req, mp); 635 return; 636 } else if (strcmp(verb, "destroy") == 0) { 637 g_mountver_ctl_destroy(req, mp); 638 return; 639 } 640 641 gctl_error(req, "Unknown verb."); 642} 643 644static void 645g_mountver_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 646 struct g_consumer *cp, struct g_provider *pp) 647{ 648 struct g_mountver_softc *sc; 649 650 if (pp != NULL || cp != NULL) 651 return; 652 653 sc = gp->softc; 654 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 655 sc->sc_orphaned ? "OFFLINE" : "ONLINE"); 656 sbuf_printf(sb, "%s<Provider-Name>%s</Provider-Name>\n", indent, sc->sc_provider_name); 657 sbuf_printf(sb, "%s<Disk-Ident>%s</Disk-Ident>\n", indent, sc->sc_ident); 658} 659 660static void 661g_mountver_shutdown_pre_sync(void *arg, int howto) 662{ 663 struct g_mountver_softc *sc; 664 struct g_class *mp; 665 struct g_geom *gp, *gp2; 666 667 mp = arg; 668 g_topology_lock(); 669 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 670 if (gp->softc == NULL) 671 continue; 672 sc = gp->softc; 673 sc->sc_shutting_down = 1; 674 if (sc->sc_orphaned) 675 g_mountver_destroy(gp, 1); 676 } 677 g_topology_unlock(); 678} 679 680static void 681g_mountver_init(struct g_class *mp) 682{ 683 684 g_mountver_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync, 685 g_mountver_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST); 686 if (g_mountver_pre_sync == NULL) 687 G_MOUNTVER_DEBUG(0, "Warning! Cannot register shutdown event."); 688} 689 690static void 691g_mountver_fini(struct g_class *mp) 692{ 693 694 if (g_mountver_pre_sync != NULL) 695 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_mountver_pre_sync); 696} 697 698DECLARE_GEOM_CLASS(g_mountver_class, g_mountver); 699MODULE_VERSION(geom_mountver, 0); 700