1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 SYSCTL_DECL(_kern_geom); 51 static SYSCTL_NODE(_kern_geom, OID_AUTO, mountver, CTLFLAG_RW | CTLFLAG_MPSAFE, 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_detach(void *arg, int flags __unused) 88 { 89 struct g_consumer *cp = arg; 90 91 g_topology_assert(); 92 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 93 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 94 g_detach(cp); 95 } 96 97 static void 98 g_mountver_done(struct bio *bp) 99 { 100 struct g_mountver_softc *sc; 101 struct g_geom *gp; 102 struct g_consumer *cp; 103 struct bio *pbp; 104 105 cp = bp->bio_from; 106 gp = cp->geom; 107 if (bp->bio_error != ENXIO) { 108 g_std_done(bp); 109 goto done; 110 } 111 112 /* 113 * When the device goes away, it's possible that few requests 114 * will be completed with ENXIO before g_mountver_orphan() 115 * gets called. To work around that, we have to queue requests 116 * that failed with ENXIO, in order to send them later. 117 */ 118 pbp = bp->bio_parent; 119 KASSERT(pbp->bio_to == LIST_FIRST(&gp->provider), 120 ("parent request was for someone else")); 121 g_destroy_bio(bp); 122 pbp->bio_inbed++; 123 g_mountver_queue(pbp); 124 125 done: 126 sc = gp->softc; 127 mtx_lock(&sc->sc_mtx); 128 if (--cp->index == 0 && sc->sc_orphaned) 129 g_post_event(g_mountver_detach, cp, M_NOWAIT, NULL); 130 mtx_unlock(&sc->sc_mtx); 131 } 132 133 /* 134 * Send the BIO down. The function is called with sc_mtx held to cover 135 * the race with orphan, but drops it before external calls. 136 */ 137 static void 138 g_mountver_send(struct g_geom *gp, struct bio *bp) 139 { 140 struct g_mountver_softc *sc = gp->softc; 141 struct g_consumer *cp; 142 struct bio *cbp; 143 144 mtx_assert(&sc->sc_mtx, MA_OWNED); 145 cbp = g_clone_bio(bp); 146 if (cbp == NULL) { 147 mtx_unlock(&sc->sc_mtx); 148 g_io_deliver(bp, ENOMEM); 149 return; 150 } 151 cp = LIST_FIRST(&gp->consumer); 152 cp->index++; 153 mtx_unlock(&sc->sc_mtx); 154 155 cbp->bio_done = g_mountver_done; 156 g_io_request(cbp, cp); 157 } 158 159 static void 160 g_mountver_queue(struct bio *bp) 161 { 162 struct g_mountver_softc *sc; 163 struct g_geom *gp; 164 165 gp = bp->bio_to->geom; 166 sc = gp->softc; 167 168 mtx_lock(&sc->sc_mtx); 169 TAILQ_INSERT_TAIL(&sc->sc_queue, bp, bio_queue); 170 mtx_unlock(&sc->sc_mtx); 171 } 172 173 static void 174 g_mountver_send_queued(struct g_geom *gp) 175 { 176 struct g_mountver_softc *sc; 177 struct bio *bp; 178 179 sc = gp->softc; 180 181 mtx_lock(&sc->sc_mtx); 182 while ((bp = TAILQ_FIRST(&sc->sc_queue)) != NULL && !sc->sc_orphaned) { 183 TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue); 184 G_MOUNTVER_LOGREQ(bp, "Sending queued request."); 185 /* sc_mtx is dropped inside */ 186 g_mountver_send(gp, bp); 187 mtx_lock(&sc->sc_mtx); 188 } 189 mtx_unlock(&sc->sc_mtx); 190 } 191 192 static void 193 g_mountver_discard_queued(struct g_geom *gp) 194 { 195 struct g_mountver_softc *sc; 196 struct bio *bp; 197 198 sc = gp->softc; 199 200 mtx_lock(&sc->sc_mtx); 201 while ((bp = TAILQ_FIRST(&sc->sc_queue)) != NULL) { 202 TAILQ_REMOVE(&sc->sc_queue, bp, bio_queue); 203 mtx_unlock(&sc->sc_mtx); 204 G_MOUNTVER_LOGREQ(bp, "Discarding queued request."); 205 g_io_deliver(bp, ENXIO); 206 mtx_lock(&sc->sc_mtx); 207 } 208 mtx_unlock(&sc->sc_mtx); 209 } 210 211 static void 212 g_mountver_start(struct bio *bp) 213 { 214 struct g_mountver_softc *sc; 215 struct g_geom *gp; 216 217 gp = bp->bio_to->geom; 218 sc = gp->softc; 219 G_MOUNTVER_LOGREQ(bp, "Request received."); 220 221 /* 222 * It is possible that some bios were returned with ENXIO, even though 223 * orphaning didn't happen yet. In that case, queue all subsequent 224 * requests in order to maintain ordering. 225 */ 226 mtx_lock(&sc->sc_mtx); 227 if (sc->sc_orphaned || !TAILQ_EMPTY(&sc->sc_queue)) { 228 mtx_unlock(&sc->sc_mtx); 229 if (sc->sc_shutting_down) { 230 G_MOUNTVER_LOGREQ(bp, "Discarding request due to shutdown."); 231 g_io_deliver(bp, ENXIO); 232 return; 233 } 234 G_MOUNTVER_LOGREQ(bp, "Queueing request."); 235 g_mountver_queue(bp); 236 if (!sc->sc_orphaned) 237 g_mountver_send_queued(gp); 238 } else { 239 G_MOUNTVER_LOGREQ(bp, "Sending request."); 240 /* sc_mtx is dropped inside */ 241 g_mountver_send(gp, bp); 242 } 243 } 244 245 static int 246 g_mountver_access(struct g_provider *pp, int dr, int dw, int de) 247 { 248 struct g_mountver_softc *sc; 249 struct g_geom *gp; 250 struct g_consumer *cp; 251 252 g_topology_assert(); 253 254 gp = pp->geom; 255 cp = LIST_FIRST(&gp->consumer); 256 sc = gp->softc; 257 if (sc == NULL && dr <= 0 && dw <= 0 && de <= 0) 258 return (0); 259 KASSERT(sc != NULL, ("Trying to access withered provider \"%s\".", pp->name)); 260 261 sc->sc_access_r += dr; 262 sc->sc_access_w += dw; 263 sc->sc_access_e += de; 264 265 if (sc->sc_orphaned) 266 return (0); 267 268 return (g_access(cp, dr, dw, de)); 269 } 270 271 static int 272 g_mountver_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp) 273 { 274 struct g_mountver_softc *sc; 275 struct g_geom *gp; 276 struct g_provider *newpp; 277 struct g_consumer *cp; 278 struct g_geom_alias *gap; 279 char name[64]; 280 int error; 281 int identsize = DISK_IDENT_SIZE; 282 283 g_topology_assert(); 284 285 gp = NULL; 286 newpp = NULL; 287 cp = NULL; 288 289 snprintf(name, sizeof(name), "%s%s", pp->name, G_MOUNTVER_SUFFIX); 290 LIST_FOREACH(gp, &mp->geom, geom) { 291 if (strcmp(gp->name, name) == 0) { 292 gctl_error(req, "Provider %s already exists.", name); 293 return (EEXIST); 294 } 295 } 296 gp = g_new_geomf(mp, "%s", name); 297 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 298 mtx_init(&sc->sc_mtx, "gmountver", NULL, MTX_DEF | MTX_RECURSE); 299 TAILQ_INIT(&sc->sc_queue); 300 sc->sc_provider_name = strdup(pp->name, M_GEOM); 301 gp->softc = sc; 302 gp->start = g_mountver_start; 303 gp->orphan = g_mountver_orphan; 304 gp->resize = g_mountver_resize; 305 gp->access = g_mountver_access; 306 gp->dumpconf = g_mountver_dumpconf; 307 308 newpp = g_new_providerf(gp, "%s", gp->name); 309 newpp->mediasize = pp->mediasize; 310 newpp->sectorsize = pp->sectorsize; 311 newpp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 312 LIST_FOREACH(gap, &pp->aliases, ga_next) 313 g_provider_add_alias(newpp, "%s%s", gap->ga_alias, G_MOUNTVER_SUFFIX); 314 315 if ((pp->flags & G_PF_ACCEPT_UNMAPPED) != 0) { 316 G_MOUNTVER_DEBUG(0, "Unmapped supported for %s.", gp->name); 317 newpp->flags |= G_PF_ACCEPT_UNMAPPED; 318 } else { 319 G_MOUNTVER_DEBUG(0, "Unmapped unsupported for %s.", gp->name); 320 newpp->flags &= ~G_PF_ACCEPT_UNMAPPED; 321 } 322 323 cp = g_new_consumer(gp); 324 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 325 error = g_attach(cp, pp); 326 if (error != 0) { 327 gctl_error(req, "Cannot attach to provider %s.", pp->name); 328 goto fail; 329 } 330 error = g_access(cp, 1, 0, 0); 331 if (error != 0) { 332 gctl_error(req, "Cannot access provider %s.", pp->name); 333 goto fail; 334 } 335 error = g_io_getattr("GEOM::ident", cp, &identsize, sc->sc_ident); 336 g_access(cp, -1, 0, 0); 337 if (error != 0) { 338 if (g_mountver_check_ident) { 339 gctl_error(req, "Cannot get disk ident from %s; error = %d.", pp->name, error); 340 goto fail; 341 } 342 343 G_MOUNTVER_DEBUG(0, "Cannot get disk ident from %s; error = %d.", pp->name, error); 344 sc->sc_ident[0] = '\0'; 345 } 346 347 g_error_provider(newpp, 0); 348 G_MOUNTVER_DEBUG(0, "Device %s created.", gp->name); 349 return (0); 350 fail: 351 g_free(sc->sc_provider_name); 352 if (cp->provider != NULL) 353 g_detach(cp); 354 g_destroy_consumer(cp); 355 g_destroy_provider(newpp); 356 g_free(gp->softc); 357 g_destroy_geom(gp); 358 return (error); 359 } 360 361 static int 362 g_mountver_destroy(struct g_geom *gp, boolean_t force) 363 { 364 struct g_mountver_softc *sc; 365 struct g_provider *pp; 366 367 g_topology_assert(); 368 if (gp->softc == NULL) 369 return (ENXIO); 370 sc = gp->softc; 371 pp = LIST_FIRST(&gp->provider); 372 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 373 if (force) { 374 G_MOUNTVER_DEBUG(0, "Device %s is still open, so it " 375 "can't be definitely removed.", pp->name); 376 } else { 377 G_MOUNTVER_DEBUG(1, "Device %s is still open (r%dw%de%d).", 378 pp->name, pp->acr, pp->acw, pp->ace); 379 return (EBUSY); 380 } 381 } else { 382 G_MOUNTVER_DEBUG(0, "Device %s removed.", gp->name); 383 } 384 if (pp != NULL) 385 g_wither_provider(pp, ENXIO); 386 g_mountver_discard_queued(gp); 387 g_free(sc->sc_provider_name); 388 g_free(gp->softc); 389 gp->softc = NULL; 390 g_wither_geom(gp, ENXIO); 391 392 return (0); 393 } 394 395 static int 396 g_mountver_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp) 397 { 398 399 return (g_mountver_destroy(gp, 0)); 400 } 401 402 static void 403 g_mountver_ctl_create(struct gctl_req *req, struct g_class *mp) 404 { 405 struct g_provider *pp; 406 char param[16]; 407 int i, *nargs; 408 409 g_topology_assert(); 410 411 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 412 if (nargs == NULL) { 413 gctl_error(req, "No '%s' argument", "nargs"); 414 return; 415 } 416 if (*nargs <= 0) { 417 gctl_error(req, "Missing device(s)."); 418 return; 419 } 420 for (i = 0; i < *nargs; i++) { 421 snprintf(param, sizeof(param), "arg%d", i); 422 pp = gctl_get_provider(req, param); 423 if (pp == NULL) 424 return; 425 if (g_mountver_create(req, mp, pp) != 0) 426 return; 427 } 428 } 429 430 static struct g_geom * 431 g_mountver_find_geom(struct g_class *mp, const char *name) 432 { 433 struct g_geom *gp; 434 435 LIST_FOREACH(gp, &mp->geom, geom) { 436 if (strcmp(gp->name, name) == 0) 437 return (gp); 438 } 439 return (NULL); 440 } 441 442 static void 443 g_mountver_ctl_destroy(struct gctl_req *req, struct g_class *mp) 444 { 445 int *nargs, *force, error, i; 446 struct g_geom *gp; 447 const char *name; 448 char param[16]; 449 450 g_topology_assert(); 451 452 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 453 if (nargs == NULL) { 454 gctl_error(req, "No '%s' argument", "nargs"); 455 return; 456 } 457 if (*nargs <= 0) { 458 gctl_error(req, "Missing device(s)."); 459 return; 460 } 461 force = gctl_get_paraml(req, "force", sizeof(*force)); 462 if (force == NULL) { 463 gctl_error(req, "No 'force' argument"); 464 return; 465 } 466 467 for (i = 0; i < *nargs; i++) { 468 snprintf(param, sizeof(param), "arg%d", i); 469 name = gctl_get_asciiparam(req, param); 470 if (name == NULL) { 471 gctl_error(req, "No 'arg%d' argument", i); 472 return; 473 } 474 if (strncmp(name, _PATH_DEV, strlen(_PATH_DEV)) == 0) 475 name += strlen(_PATH_DEV); 476 gp = g_mountver_find_geom(mp, name); 477 if (gp == NULL) { 478 G_MOUNTVER_DEBUG(1, "Device %s is invalid.", name); 479 gctl_error(req, "Device %s is invalid.", name); 480 return; 481 } 482 error = g_mountver_destroy(gp, *force); 483 if (error != 0) { 484 gctl_error(req, "Cannot destroy device %s (error=%d).", 485 gp->name, error); 486 return; 487 } 488 } 489 } 490 491 static void 492 g_mountver_orphan(struct g_consumer *cp) 493 { 494 struct g_mountver_softc *sc; 495 int done; 496 497 g_topology_assert(); 498 499 sc = cp->geom->softc; 500 mtx_lock(&sc->sc_mtx); 501 sc->sc_orphaned = 1; 502 done = (cp->index == 0); 503 mtx_unlock(&sc->sc_mtx); 504 if (done) 505 g_mountver_detach(cp, 0); 506 G_MOUNTVER_DEBUG(0, "%s is offline. Mount verification in progress.", sc->sc_provider_name); 507 } 508 509 static void 510 g_mountver_resize(struct g_consumer *cp) 511 { 512 struct g_geom *gp; 513 struct g_provider *pp; 514 515 gp = cp->geom; 516 517 LIST_FOREACH(pp, &gp->provider, provider) 518 g_resize_provider(pp, cp->provider->mediasize); 519 } 520 521 static int 522 g_mountver_ident_matches(struct g_geom *gp) 523 { 524 struct g_consumer *cp; 525 struct g_mountver_softc *sc; 526 char ident[DISK_IDENT_SIZE]; 527 int error, identsize = DISK_IDENT_SIZE; 528 529 sc = gp->softc; 530 cp = LIST_FIRST(&gp->consumer); 531 532 if (g_mountver_check_ident == 0) 533 return (0); 534 535 error = g_access(cp, 1, 0, 0); 536 if (error != 0) { 537 G_MOUNTVER_DEBUG(0, "Cannot access %s; " 538 "not attaching; error = %d.", gp->name, error); 539 return (1); 540 } 541 error = g_io_getattr("GEOM::ident", cp, &identsize, ident); 542 g_access(cp, -1, 0, 0); 543 if (error != 0) { 544 G_MOUNTVER_DEBUG(0, "Cannot get disk ident for %s; " 545 "not attaching; error = %d.", gp->name, error); 546 return (1); 547 } 548 if (strcmp(ident, sc->sc_ident) != 0) { 549 G_MOUNTVER_DEBUG(1, "Disk ident for %s (\"%s\") is different " 550 "from expected \"%s\", not attaching.", gp->name, ident, 551 sc->sc_ident); 552 return (1); 553 } 554 555 return (0); 556 } 557 558 static struct g_geom * 559 g_mountver_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 560 { 561 struct g_mountver_softc *sc; 562 struct g_consumer *cp; 563 struct g_geom *gp; 564 int error; 565 566 g_topology_assert(); 567 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 568 G_MOUNTVER_DEBUG(2, "Tasting %s.", pp->name); 569 570 /* 571 * Let's check if device already exists. 572 */ 573 LIST_FOREACH(gp, &mp->geom, geom) { 574 sc = gp->softc; 575 if (sc == NULL) 576 continue; 577 578 /* Already attached? */ 579 if (pp == LIST_FIRST(&gp->provider)) 580 return (NULL); 581 582 if (sc->sc_orphaned && strcmp(pp->name, sc->sc_provider_name) == 0) 583 break; 584 } 585 if (gp == NULL) 586 return (NULL); 587 588 cp = LIST_FIRST(&gp->consumer); 589 error = g_attach(cp, pp); 590 if (error != 0) { 591 G_MOUNTVER_DEBUG(0, "Cannot attach to %s; error = %d.", pp->name, error); 592 return (NULL); 593 } 594 595 error = g_mountver_ident_matches(gp); 596 if (error != 0) { 597 g_detach(cp); 598 return (NULL); 599 } 600 if (sc->sc_access_r > 0 || sc->sc_access_w > 0 || sc->sc_access_e > 0) { 601 error = g_access(cp, sc->sc_access_r, sc->sc_access_w, sc->sc_access_e); 602 if (error != 0) { 603 G_MOUNTVER_DEBUG(0, "Cannot access %s; error = %d.", pp->name, error); 604 g_detach(cp); 605 return (NULL); 606 } 607 } 608 sc->sc_orphaned = 0; 609 g_mountver_send_queued(gp); 610 G_MOUNTVER_DEBUG(0, "%s has completed mount verification.", sc->sc_provider_name); 611 612 return (gp); 613 } 614 615 static void 616 g_mountver_config(struct gctl_req *req, struct g_class *mp, const char *verb) 617 { 618 uint32_t *version; 619 620 g_topology_assert(); 621 622 version = gctl_get_paraml(req, "version", sizeof(*version)); 623 if (version == NULL) { 624 gctl_error(req, "No '%s' argument.", "version"); 625 return; 626 } 627 if (*version != G_MOUNTVER_VERSION) { 628 gctl_error(req, "Userland and kernel parts are out of sync."); 629 return; 630 } 631 632 if (strcmp(verb, "create") == 0) { 633 g_mountver_ctl_create(req, mp); 634 return; 635 } else if (strcmp(verb, "destroy") == 0) { 636 g_mountver_ctl_destroy(req, mp); 637 return; 638 } 639 640 gctl_error(req, "Unknown verb."); 641 } 642 643 static void 644 g_mountver_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 645 struct g_consumer *cp, struct g_provider *pp) 646 { 647 struct g_mountver_softc *sc; 648 649 if (pp != NULL || cp != NULL) 650 return; 651 652 sc = gp->softc; 653 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 654 sc->sc_orphaned ? "OFFLINE" : "ONLINE"); 655 sbuf_printf(sb, "%s<Provider-Name>%s</Provider-Name>\n", indent, sc->sc_provider_name); 656 sbuf_printf(sb, "%s<Disk-Ident>%s</Disk-Ident>\n", indent, sc->sc_ident); 657 } 658 659 static void 660 g_mountver_shutdown_pre_sync(void *arg, int howto) 661 { 662 struct g_mountver_softc *sc; 663 struct g_class *mp; 664 struct g_geom *gp, *gp2; 665 666 mp = arg; 667 g_topology_lock(); 668 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 669 if (gp->softc == NULL) 670 continue; 671 sc = gp->softc; 672 sc->sc_shutting_down = 1; 673 if (sc->sc_orphaned) 674 g_mountver_destroy(gp, 1); 675 } 676 g_topology_unlock(); 677 } 678 679 static void 680 g_mountver_init(struct g_class *mp) 681 { 682 683 g_mountver_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync, 684 g_mountver_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST); 685 if (g_mountver_pre_sync == NULL) 686 G_MOUNTVER_DEBUG(0, "Warning! Cannot register shutdown event."); 687 } 688 689 static void 690 g_mountver_fini(struct g_class *mp) 691 { 692 693 if (g_mountver_pre_sync != NULL) 694 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_mountver_pre_sync); 695 } 696 697 DECLARE_GEOM_CLASS(g_mountver_class, g_mountver); 698 MODULE_VERSION(geom_mountver, 0); 699