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, 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 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; 312 313 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 const char *name; 405 char param[16]; 406 int i, *nargs; 407 408 g_topology_assert(); 409 410 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 411 if (nargs == NULL) { 412 gctl_error(req, "No '%s' argument", "nargs"); 413 return; 414 } 415 if (*nargs <= 0) { 416 gctl_error(req, "Missing device(s)."); 417 return; 418 } 419 for (i = 0; i < *nargs; i++) { 420 snprintf(param, sizeof(param), "arg%d", i); 421 name = gctl_get_asciiparam(req, param); 422 if (name == NULL) { 423 gctl_error(req, "No 'arg%d' argument", i); 424 return; 425 } 426 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 427 name += strlen("/dev/"); 428 pp = g_provider_by_name(name); 429 if (pp == NULL) { 430 G_MOUNTVER_DEBUG(1, "Provider %s is invalid.", name); 431 gctl_error(req, "Provider %s is invalid.", name); 432 return; 433 } 434 if (g_mountver_create(req, mp, pp) != 0) 435 return; 436 } 437 } 438 439 static struct g_geom * 440 g_mountver_find_geom(struct g_class *mp, const char *name) 441 { 442 struct g_geom *gp; 443 444 LIST_FOREACH(gp, &mp->geom, geom) { 445 if (strcmp(gp->name, name) == 0) 446 return (gp); 447 } 448 return (NULL); 449 } 450 451 static void 452 g_mountver_ctl_destroy(struct gctl_req *req, struct g_class *mp) 453 { 454 int *nargs, *force, error, i; 455 struct g_geom *gp; 456 const char *name; 457 char param[16]; 458 459 g_topology_assert(); 460 461 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); 462 if (nargs == NULL) { 463 gctl_error(req, "No '%s' argument", "nargs"); 464 return; 465 } 466 if (*nargs <= 0) { 467 gctl_error(req, "Missing device(s)."); 468 return; 469 } 470 force = gctl_get_paraml(req, "force", sizeof(*force)); 471 if (force == NULL) { 472 gctl_error(req, "No 'force' argument"); 473 return; 474 } 475 476 for (i = 0; i < *nargs; i++) { 477 snprintf(param, sizeof(param), "arg%d", i); 478 name = gctl_get_asciiparam(req, param); 479 if (name == NULL) { 480 gctl_error(req, "No 'arg%d' argument", i); 481 return; 482 } 483 if (strncmp(name, "/dev/", strlen("/dev/")) == 0) 484 name += strlen("/dev/"); 485 gp = g_mountver_find_geom(mp, name); 486 if (gp == NULL) { 487 G_MOUNTVER_DEBUG(1, "Device %s is invalid.", name); 488 gctl_error(req, "Device %s is invalid.", name); 489 return; 490 } 491 error = g_mountver_destroy(gp, *force); 492 if (error != 0) { 493 gctl_error(req, "Cannot destroy device %s (error=%d).", 494 gp->name, error); 495 return; 496 } 497 } 498 } 499 500 static void 501 g_mountver_orphan(struct g_consumer *cp) 502 { 503 struct g_mountver_softc *sc; 504 int done; 505 506 g_topology_assert(); 507 508 sc = cp->geom->softc; 509 mtx_lock(&sc->sc_mtx); 510 sc->sc_orphaned = 1; 511 done = (cp->index == 0); 512 mtx_unlock(&sc->sc_mtx); 513 if (done) 514 g_mountver_detach(cp, 0); 515 G_MOUNTVER_DEBUG(0, "%s is offline. Mount verification in progress.", sc->sc_provider_name); 516 } 517 518 static void 519 g_mountver_resize(struct g_consumer *cp) 520 { 521 struct g_geom *gp; 522 struct g_provider *pp; 523 524 gp = cp->geom; 525 526 LIST_FOREACH(pp, &gp->provider, provider) 527 g_resize_provider(pp, cp->provider->mediasize); 528 } 529 530 static int 531 g_mountver_ident_matches(struct g_geom *gp) 532 { 533 struct g_consumer *cp; 534 struct g_mountver_softc *sc; 535 char ident[DISK_IDENT_SIZE]; 536 int error, identsize = DISK_IDENT_SIZE; 537 538 sc = gp->softc; 539 cp = LIST_FIRST(&gp->consumer); 540 541 if (g_mountver_check_ident == 0) 542 return (0); 543 544 error = g_access(cp, 1, 0, 0); 545 if (error != 0) { 546 G_MOUNTVER_DEBUG(0, "Cannot access %s; " 547 "not attaching; error = %d.", gp->name, error); 548 return (1); 549 } 550 error = g_io_getattr("GEOM::ident", cp, &identsize, ident); 551 g_access(cp, -1, 0, 0); 552 if (error != 0) { 553 G_MOUNTVER_DEBUG(0, "Cannot get disk ident for %s; " 554 "not attaching; error = %d.", gp->name, error); 555 return (1); 556 } 557 if (strcmp(ident, sc->sc_ident) != 0) { 558 G_MOUNTVER_DEBUG(1, "Disk ident for %s (\"%s\") is different " 559 "from expected \"%s\", not attaching.", gp->name, ident, 560 sc->sc_ident); 561 return (1); 562 } 563 564 return (0); 565 } 566 567 static struct g_geom * 568 g_mountver_taste(struct g_class *mp, struct g_provider *pp, int flags __unused) 569 { 570 struct g_mountver_softc *sc; 571 struct g_consumer *cp; 572 struct g_geom *gp; 573 int error; 574 575 g_topology_assert(); 576 g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name); 577 G_MOUNTVER_DEBUG(2, "Tasting %s.", pp->name); 578 579 /* 580 * Let's check if device already exists. 581 */ 582 LIST_FOREACH(gp, &mp->geom, geom) { 583 sc = gp->softc; 584 if (sc == NULL) 585 continue; 586 587 /* Already attached? */ 588 if (pp == LIST_FIRST(&gp->provider)) 589 return (NULL); 590 591 if (sc->sc_orphaned && strcmp(pp->name, sc->sc_provider_name) == 0) 592 break; 593 } 594 if (gp == NULL) 595 return (NULL); 596 597 cp = LIST_FIRST(&gp->consumer); 598 g_attach(cp, pp); 599 error = g_mountver_ident_matches(gp); 600 if (error != 0) { 601 g_detach(cp); 602 return (NULL); 603 } 604 if (sc->sc_access_r > 0 || sc->sc_access_w > 0 || sc->sc_access_e > 0) { 605 error = g_access(cp, sc->sc_access_r, sc->sc_access_w, sc->sc_access_e); 606 if (error != 0) { 607 G_MOUNTVER_DEBUG(0, "Cannot access %s; error = %d.", pp->name, error); 608 g_detach(cp); 609 return (NULL); 610 } 611 } 612 sc->sc_orphaned = 0; 613 g_mountver_send_queued(gp); 614 G_MOUNTVER_DEBUG(0, "%s has completed mount verification.", sc->sc_provider_name); 615 616 return (gp); 617 } 618 619 static void 620 g_mountver_config(struct gctl_req *req, struct g_class *mp, const char *verb) 621 { 622 uint32_t *version; 623 624 g_topology_assert(); 625 626 version = gctl_get_paraml(req, "version", sizeof(*version)); 627 if (version == NULL) { 628 gctl_error(req, "No '%s' argument.", "version"); 629 return; 630 } 631 if (*version != G_MOUNTVER_VERSION) { 632 gctl_error(req, "Userland and kernel parts are out of sync."); 633 return; 634 } 635 636 if (strcmp(verb, "create") == 0) { 637 g_mountver_ctl_create(req, mp); 638 return; 639 } else if (strcmp(verb, "destroy") == 0) { 640 g_mountver_ctl_destroy(req, mp); 641 return; 642 } 643 644 gctl_error(req, "Unknown verb."); 645 } 646 647 static void 648 g_mountver_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 649 struct g_consumer *cp, struct g_provider *pp) 650 { 651 struct g_mountver_softc *sc; 652 653 if (pp != NULL || cp != NULL) 654 return; 655 656 sc = gp->softc; 657 sbuf_printf(sb, "%s<State>%s</State>\n", indent, 658 sc->sc_orphaned ? "OFFLINE" : "ONLINE"); 659 sbuf_printf(sb, "%s<Provider-Name>%s</Provider-Name>\n", indent, sc->sc_provider_name); 660 sbuf_printf(sb, "%s<Disk-Ident>%s</Disk-Ident>\n", indent, sc->sc_ident); 661 } 662 663 static void 664 g_mountver_shutdown_pre_sync(void *arg, int howto) 665 { 666 struct g_mountver_softc *sc; 667 struct g_class *mp; 668 struct g_geom *gp, *gp2; 669 670 mp = arg; 671 g_topology_lock(); 672 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 673 if (gp->softc == NULL) 674 continue; 675 sc = gp->softc; 676 sc->sc_shutting_down = 1; 677 if (sc->sc_orphaned) 678 g_mountver_destroy(gp, 1); 679 } 680 g_topology_unlock(); 681 } 682 683 static void 684 g_mountver_init(struct g_class *mp) 685 { 686 687 g_mountver_pre_sync = EVENTHANDLER_REGISTER(shutdown_pre_sync, 688 g_mountver_shutdown_pre_sync, mp, SHUTDOWN_PRI_FIRST); 689 if (g_mountver_pre_sync == NULL) 690 G_MOUNTVER_DEBUG(0, "Warning! Cannot register shutdown event."); 691 } 692 693 static void 694 g_mountver_fini(struct g_class *mp) 695 { 696 697 if (g_mountver_pre_sync != NULL) 698 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, g_mountver_pre_sync); 699 } 700 701 DECLARE_GEOM_CLASS(g_mountver_class, g_mountver); 702 MODULE_VERSION(geom_mountver, 0); 703