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 #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/geom_dbg.h> 46 #include <geom/mountver/g_mountver.h> 47 48 SYSCTL_DECL(_kern_geom); 49 static SYSCTL_NODE(_kern_geom, OID_AUTO, mountver, CTLFLAG_RW | CTLFLAG_MPSAFE, 50 0, "GEOM_MOUNTVER stuff"); 51 static u_int g_mountver_debug = 0; 52 static u_int g_mountver_check_ident = 1; 53 SYSCTL_UINT(_kern_geom_mountver, OID_AUTO, debug, CTLFLAG_RW, 54 &g_mountver_debug, 0, "Debug level"); 55 SYSCTL_UINT(_kern_geom_mountver, OID_AUTO, check_ident, CTLFLAG_RW, 56 &g_mountver_check_ident, 0, "Check disk ident when reattaching"); 57 58 static eventhandler_tag g_mountver_pre_sync = NULL; 59 60 static void g_mountver_queue(struct bio *bp); 61 static void g_mountver_orphan(struct g_consumer *cp); 62 static void g_mountver_resize(struct g_consumer *cp); 63 static int g_mountver_destroy(struct g_geom *gp, boolean_t force); 64 static g_taste_t g_mountver_taste; 65 static int g_mountver_destroy_geom(struct gctl_req *req, struct g_class *mp, 66 struct g_geom *gp); 67 static void g_mountver_config(struct gctl_req *req, struct g_class *mp, 68 const char *verb); 69 static void g_mountver_dumpconf(struct sbuf *sb, const char *indent, 70 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); 71 static void g_mountver_init(struct g_class *mp); 72 static void g_mountver_fini(struct g_class *mp); 73 74 struct 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 84 static void 85 g_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 95 static void 96 g_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); 122 123 done: 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 */ 135 static void 136 g_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 } 156 157 static void 158 g_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 } 170 171 static void 172 g_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 } 189 190 static void 191 g_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 } 208 209 static void 210 g_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 } 242 243 static int 244 g_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 } 268 269 static int 270 g_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 struct g_geom_alias *gap; 277 char name[64]; 278 int error; 279 int identsize = DISK_IDENT_SIZE; 280 281 g_topology_assert(); 282 283 gp = NULL; 284 newpp = NULL; 285 cp = NULL; 286 287 snprintf(name, sizeof(name), "%s%s", pp->name, G_MOUNTVER_SUFFIX); 288 LIST_FOREACH(gp, &mp->geom, geom) { 289 if (strcmp(gp->name, name) == 0) { 290 gctl_error(req, "Provider %s already exists.", name); 291 return (EEXIST); 292 } 293 } 294 gp = g_new_geomf(mp, "%s", name); 295 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 296 mtx_init(&sc->sc_mtx, "gmountver", NULL, MTX_DEF | MTX_RECURSE); 297 TAILQ_INIT(&sc->sc_queue); 298 sc->sc_provider_name = strdup(pp->name, M_GEOM); 299 gp->softc = sc; 300 gp->start = g_mountver_start; 301 gp->orphan = g_mountver_orphan; 302 gp->resize = g_mountver_resize; 303 gp->access = g_mountver_access; 304 gp->dumpconf = g_mountver_dumpconf; 305 306 newpp = g_new_providerf(gp, "%s", gp->name); 307 newpp->mediasize = pp->mediasize; 308 newpp->sectorsize = pp->sectorsize; 309 newpp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE; 310 LIST_FOREACH(gap, &pp->aliases, ga_next) 311 g_provider_add_alias(newpp, "%s%s", gap->ga_alias, G_MOUNTVER_SUFFIX); 312 313 if ((pp->flags & G_PF_ACCEPT_UNMAPPED) != 0) { 314 G_MOUNTVER_DEBUG(0, "Unmapped supported for %s.", gp->name); 315 newpp->flags |= G_PF_ACCEPT_UNMAPPED; 316 } else { 317 G_MOUNTVER_DEBUG(0, "Unmapped unsupported for %s.", gp->name); 318 newpp->flags &= ~G_PF_ACCEPT_UNMAPPED; 319 } 320 321 cp = g_new_consumer(gp); 322 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 323 error = g_attach(cp, pp); 324 if (error != 0) { 325 gctl_error(req, "Cannot attach to provider %s.", pp->name); 326 goto fail; 327 } 328 error = g_access(cp, 1, 0, 0); 329 if (error != 0) { 330 gctl_error(req, "Cannot access provider %s.", pp->name); 331 goto fail; 332 } 333 error = g_io_getattr("GEOM::ident", cp, &identsize, sc->sc_ident); 334 g_access(cp, -1, 0, 0); 335 if (error != 0) { 336 if (g_mountver_check_ident) { 337 gctl_error(req, "Cannot get disk ident from %s; error = %d.", pp->name, error); 338 goto fail; 339 } 340 341 G_MOUNTVER_DEBUG(0, "Cannot get disk ident from %s; error = %d.", pp->name, error); 342 sc->sc_ident[0] = '\0'; 343 } 344 345 g_error_provider(newpp, 0); 346 G_MOUNTVER_DEBUG(0, "Device %s created.", gp->name); 347 return (0); 348 fail: 349 g_free(sc->sc_provider_name); 350 if (cp->provider != NULL) 351 g_detach(cp); 352 g_destroy_consumer(cp); 353 g_destroy_provider(newpp); 354 g_free(gp->softc); 355 g_destroy_geom(gp); 356 return (error); 357 } 358 359 static int 360 g_mountver_destroy(struct g_geom *gp, boolean_t force) 361 { 362 struct g_mountver_softc *sc; 363 struct g_provider *pp; 364 365 g_topology_assert(); 366 if (gp->softc == NULL) 367 return (ENXIO); 368 sc = gp->softc; 369 pp = LIST_FIRST(&gp->provider); 370 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { 371 if (force) { 372 G_MOUNTVER_DEBUG(0, "Device %s is still open, so it " 373 "can't be definitely removed.", pp->name); 374 } else { 375 G_MOUNTVER_DEBUG(1, "Device %s is still open (r%dw%de%d).", 376 pp->name, pp->acr, pp->acw, pp->ace); 377 return (EBUSY); 378 } 379 } else { 380 G_MOUNTVER_DEBUG(0, "Device %s removed.", gp->name); 381 } 382 if (pp != NULL) 383 g_wither_provider(pp, ENXIO); 384 g_mountver_discard_queued(gp); 385 g_free(sc->sc_provider_name); 386 g_free(gp->softc); 387 gp->softc = NULL; 388 g_wither_geom(gp, ENXIO); 389 390 return (0); 391 } 392 393 static int 394 g_mountver_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp) 395 { 396 397 return (g_mountver_destroy(gp, 0)); 398 } 399 400 static void 401 g_mountver_ctl_create(struct gctl_req *req, struct g_class *mp) 402 { 403 struct g_provider *pp; 404 char param[16]; 405 int i, *nargs; 406 407 g_topology_assert(); 408 409 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 410 if (nargs == NULL) { 411 gctl_error(req, "No '%s' argument", "nargs"); 412 return; 413 } 414 if (*nargs <= 0) { 415 gctl_error(req, "Missing device(s)."); 416 return; 417 } 418 for (i = 0; i < *nargs; i++) { 419 snprintf(param, sizeof(param), "arg%d", i); 420 pp = gctl_get_provider(req, param); 421 if (pp == NULL) 422 return; 423 if (g_mountver_create(req, mp, pp) != 0) 424 return; 425 } 426 } 427 428 static struct g_geom * 429 g_mountver_find_geom(struct g_class *mp, const char *name) 430 { 431 struct g_geom *gp; 432 433 LIST_FOREACH(gp, &mp->geom, geom) { 434 if (strcmp(gp->name, name) == 0) 435 return (gp); 436 } 437 return (NULL); 438 } 439 440 static void 441 g_mountver_ctl_destroy(struct gctl_req *req, struct g_class *mp) 442 { 443 int *nargs, *force, error, i; 444 struct g_geom *gp; 445 const char *name; 446 char param[16]; 447 448 g_topology_assert(); 449 450 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 451 if (nargs == NULL) { 452 gctl_error(req, "No '%s' argument", "nargs"); 453 return; 454 } 455 if (*nargs <= 0) { 456 gctl_error(req, "Missing device(s)."); 457 return; 458 } 459 force = gctl_get_paraml(req, "force", sizeof(*force)); 460 if (force == NULL) { 461 gctl_error(req, "No 'force' argument"); 462 return; 463 } 464 465 for (i = 0; i < *nargs; i++) { 466 snprintf(param, sizeof(param), "arg%d", i); 467 name = gctl_get_asciiparam(req, param); 468 if (name == NULL) { 469 gctl_error(req, "No 'arg%d' argument", i); 470 return; 471 } 472 if (strncmp(name, _PATH_DEV, strlen(_PATH_DEV)) == 0) 473 name += strlen(_PATH_DEV); 474 gp = g_mountver_find_geom(mp, name); 475 if (gp == NULL) { 476 G_MOUNTVER_DEBUG(1, "Device %s is invalid.", name); 477 gctl_error(req, "Device %s is invalid.", name); 478 return; 479 } 480 error = g_mountver_destroy(gp, *force); 481 if (error != 0) { 482 gctl_error(req, "Cannot destroy device %s (error=%d).", 483 gp->name, error); 484 return; 485 } 486 } 487 } 488 489 static void 490 g_mountver_orphan(struct g_consumer *cp) 491 { 492 struct g_mountver_softc *sc; 493 int done; 494 495 g_topology_assert(); 496 497 sc = cp->geom->softc; 498 mtx_lock(&sc->sc_mtx); 499 sc->sc_orphaned = 1; 500 done = (cp->index == 0); 501 mtx_unlock(&sc->sc_mtx); 502 if (done) 503 g_mountver_detach(cp, 0); 504 G_MOUNTVER_DEBUG(0, "%s is offline. Mount verification in progress.", sc->sc_provider_name); 505 } 506 507 static void 508 g_mountver_resize(struct g_consumer *cp) 509 { 510 struct g_geom *gp; 511 struct g_provider *pp; 512 513 gp = cp->geom; 514 515 LIST_FOREACH(pp, &gp->provider, provider) 516 g_resize_provider(pp, cp->provider->mediasize); 517 } 518 519 static int 520 g_mountver_ident_matches(struct g_geom *gp) 521 { 522 struct g_consumer *cp; 523 struct g_mountver_softc *sc; 524 char ident[DISK_IDENT_SIZE]; 525 int error, identsize = DISK_IDENT_SIZE; 526 527 sc = gp->softc; 528 cp = LIST_FIRST(&gp->consumer); 529 530 if (g_mountver_check_ident == 0) 531 return (0); 532 533 error = g_access(cp, 1, 0, 0); 534 if (error != 0) { 535 G_MOUNTVER_DEBUG(0, "Cannot access %s; " 536 "not attaching; error = %d.", gp->name, error); 537 return (1); 538 } 539 error = g_io_getattr("GEOM::ident", cp, &identsize, ident); 540 g_access(cp, -1, 0, 0); 541 if (error != 0) { 542 G_MOUNTVER_DEBUG(0, "Cannot get disk ident for %s; " 543 "not attaching; error = %d.", gp->name, error); 544 return (1); 545 } 546 if (strcmp(ident, sc->sc_ident) != 0) { 547 G_MOUNTVER_DEBUG(1, "Disk ident for %s (\"%s\") is different " 548 "from expected \"%s\", not attaching.", gp->name, ident, 549 sc->sc_ident); 550 return (1); 551 } 552 553 return (0); 554 } 555 556 static struct g_geom * 557 g_mountver_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 558 { 559 struct g_mountver_softc *sc; 560 struct g_consumer *cp; 561 struct g_geom *gp; 562 int error; 563 564 g_topology_assert(); 565 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 566 G_MOUNTVER_DEBUG(2, "Tasting %s.", pp->name); 567 568 /* 569 * Let's check if device already exists. 570 */ 571 LIST_FOREACH(gp, &mp->geom, geom) { 572 sc = gp->softc; 573 if (sc == NULL) 574 continue; 575 576 /* Already attached? */ 577 if (pp == LIST_FIRST(&gp->provider)) 578 return (NULL); 579 580 if (sc->sc_orphaned && strcmp(pp->name, sc->sc_provider_name) == 0) 581 break; 582 } 583 if (gp == NULL) 584 return (NULL); 585 586 cp = LIST_FIRST(&gp->consumer); 587 error = g_attach(cp, pp); 588 if (error != 0) { 589 G_MOUNTVER_DEBUG(0, "Cannot attach to %s; error = %d.", pp->name, error); 590 return (NULL); 591 } 592 593 error = g_mountver_ident_matches(gp); 594 if (error != 0) { 595 g_detach(cp); 596 return (NULL); 597 } 598 if (sc->sc_access_r > 0 || sc->sc_access_w > 0 || sc->sc_access_e > 0) { 599 error = g_access(cp, sc->sc_access_r, sc->sc_access_w, sc->sc_access_e); 600 if (error != 0) { 601 G_MOUNTVER_DEBUG(0, "Cannot access %s; error = %d.", pp->name, error); 602 g_detach(cp); 603 return (NULL); 604 } 605 } 606 sc->sc_orphaned = 0; 607 g_mountver_send_queued(gp); 608 G_MOUNTVER_DEBUG(0, "%s has completed mount verification.", sc->sc_provider_name); 609 610 return (gp); 611 } 612 613 static void 614 g_mountver_config(struct gctl_req *req, struct g_class *mp, const char *verb) 615 { 616 uint32_t *version; 617 618 g_topology_assert(); 619 620 version = gctl_get_paraml(req, "version", sizeof(*version)); 621 if (version == NULL) { 622 gctl_error(req, "No '%s' argument.", "version"); 623 return; 624 } 625 if (*version != G_MOUNTVER_VERSION) { 626 gctl_error(req, "Userland and kernel parts are out of sync."); 627 return; 628 } 629 630 if (strcmp(verb, "create") == 0) { 631 g_mountver_ctl_create(req, mp); 632 return; 633 } else if (strcmp(verb, "destroy") == 0) { 634 g_mountver_ctl_destroy(req, mp); 635 return; 636 } 637 638 gctl_error(req, "Unknown verb."); 639 } 640 641 static void 642 g_mountver_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 643 struct g_consumer *cp, struct g_provider *pp) 644 { 645 struct g_mountver_softc *sc; 646 647 if (pp != NULL || cp != NULL) 648 return; 649 650 sc = gp->softc; 651 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 652 sc->sc_orphaned ? "OFFLINE" : "ONLINE"); 653 sbuf_printf(sb, "%s<Provider-Name>%s</Provider-Name>\n", indent, sc->sc_provider_name); 654 sbuf_printf(sb, "%s<Disk-Ident>%s</Disk-Ident>\n", indent, sc->sc_ident); 655 } 656 657 static void 658 g_mountver_shutdown_pre_sync(void *arg, int howto) 659 { 660 struct g_mountver_softc *sc; 661 struct g_class *mp; 662 struct g_geom *gp, *gp2; 663 664 mp = arg; 665 g_topology_lock(); 666 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 667 if (gp->softc == NULL) 668 continue; 669 sc = gp->softc; 670 sc->sc_shutting_down = 1; 671 if (sc->sc_orphaned) 672 g_mountver_destroy(gp, 1); 673 } 674 g_topology_unlock(); 675 } 676 677 static void 678 g_mountver_init(struct g_class *mp) 679 { 680 681 g_mountver_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync, 682 g_mountver_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST); 683 if (g_mountver_pre_sync == NULL) 684 G_MOUNTVER_DEBUG(0, "Warning! Cannot register shutdown event."); 685 } 686 687 static void 688 g_mountver_fini(struct g_class *mp) 689 { 690 691 if (g_mountver_pre_sync != NULL) 692 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_mountver_pre_sync); 693 } 694 695 DECLARE_GEOM_CLASS(g_mountver_class, g_mountver); 696 MODULE_VERSION(geom_mountver, 0); 697