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