Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_dev.c
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1 /*- 2 * Copyright (c) 2002 Poul-Henning Kamp 3 * Copyright (c) 2002 Networks Associates Technology, Inc. 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp 7 * and NAI Labs, the Security Research Division of Network Associates, Inc. 8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 9 * DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The names of the authors may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/malloc.h> 42 #include <sys/kernel.h> 43 #include <sys/conf.h> 44 #include <sys/ctype.h> 45 #include <sys/bio.h> 46 #include <sys/bus.h> 47 #include <sys/lock.h> 48 #include <sys/mutex.h> 49 #include <sys/proc.h> 50 #include <sys/errno.h> 51 #include <sys/time.h> 52 #include <sys/disk.h> 53 #include <sys/fcntl.h> 54 #include <sys/limits.h> 55 #include <sys/sysctl.h> 56 #include <geom/geom.h> 57 #include <geom/geom_int.h> 58 #include <machine/stdarg.h> 59 60 struct g_dev_softc { 61 struct mtx sc_mtx; 62 struct cdev *sc_dev; 63 struct cdev *sc_alias; 64 int sc_open; 65 int sc_active; 66 }; 67 68 static d_open_t g_dev_open; 69 static d_close_t g_dev_close; 70 static d_strategy_t g_dev_strategy; 71 static d_ioctl_t g_dev_ioctl; 72 73 static struct cdevsw g_dev_cdevsw = { 74 .d_version = D_VERSION, 75 .d_open = g_dev_open, 76 .d_close = g_dev_close, 77 .d_read = physread, 78 .d_write = physwrite, 79 .d_ioctl = g_dev_ioctl, 80 .d_strategy = g_dev_strategy, 81 .d_name = "g_dev", 82 .d_flags = D_DISK | D_TRACKCLOSE, 83 }; 84 85 static g_init_t g_dev_init; 86 static g_fini_t g_dev_fini; 87 static g_taste_t g_dev_taste; 88 static g_orphan_t g_dev_orphan; 89 static g_attrchanged_t g_dev_attrchanged; 90 91 static struct g_class g_dev_class = { 92 .name = "DEV", 93 .version = G_VERSION, 94 .init = g_dev_init, 95 .fini = g_dev_fini, 96 .taste = g_dev_taste, 97 .orphan = g_dev_orphan, 98 .attrchanged = g_dev_attrchanged 99 }; 100 101 /* 102 * We target 262144 (8 x 32768) sectors by default as this significantly 103 * increases the throughput on commonly used SSD's with a marginal 104 * increase in non-interruptible request latency. 105 */ 106 static uint64_t g_dev_del_max_sectors = 262144; 107 SYSCTL_DECL(_kern_geom); 108 SYSCTL_NODE(_kern_geom, OID_AUTO, dev, CTLFLAG_RW, 0, "GEOM_DEV stuff"); 109 SYSCTL_QUAD(_kern_geom_dev, OID_AUTO, delete_max_sectors, CTLFLAG_RW, 110 &g_dev_del_max_sectors, 0, "Maximum number of sectors in a single " 111 "delete request sent to the provider. Larger requests are chunked " 112 "so they can be interrupted. (0 = disable chunking)"); 113 114 static char *dumpdev = NULL; 115 static void 116 g_dev_init(struct g_class *mp) 117 { 118 119 dumpdev = getenv("dumpdev"); 120 } 121 122 static void 123 g_dev_fini(struct g_class *mp) 124 { 125 126 freeenv(dumpdev); 127 } 128 129 static int 130 g_dev_setdumpdev(struct cdev *dev) 131 { 132 struct g_kerneldump kd; 133 struct g_consumer *cp; 134 int error, len; 135 136 if (dev == NULL) 137 return (set_dumper(NULL)); 138 139 cp = dev->si_drv2; 140 len = sizeof(kd); 141 kd.offset = 0; 142 kd.length = OFF_MAX; 143 error = g_io_getattr("GEOM::kerneldump", cp, &len, &kd); 144 if (error == 0) { 145 error = set_dumper(&kd.di); 146 if (error == 0) 147 dev->si_flags |= SI_DUMPDEV; 148 } 149 return (error); 150 } 151 152 static void 153 init_dumpdev(struct cdev *dev) 154 { 155 156 if (dumpdev == NULL) 157 return; 158 if (strcmp(devtoname(dev), dumpdev) != 0) 159 return; 160 if (g_dev_setdumpdev(dev) == 0) { 161 freeenv(dumpdev); 162 dumpdev = NULL; 163 } 164 } 165 166 static void 167 g_dev_destroy(void *arg, int flags __unused) 168 { 169 struct g_consumer *cp; 170 struct g_geom *gp; 171 struct g_dev_softc *sc; 172 173 g_topology_assert(); 174 cp = arg; 175 gp = cp->geom; 176 sc = cp->private; 177 g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name); 178 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 179 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 180 g_detach(cp); 181 g_destroy_consumer(cp); 182 g_destroy_geom(gp); 183 mtx_destroy(&sc->sc_mtx); 184 g_free(sc); 185 } 186 187 void 188 g_dev_print(void) 189 { 190 struct g_geom *gp; 191 char const *p = ""; 192 193 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 194 printf("%s%s", p, gp->name); 195 p = " "; 196 } 197 printf("\n"); 198 } 199 200 static void 201 g_dev_attrchanged(struct g_consumer *cp, const char *attr) 202 { 203 struct g_dev_softc *sc; 204 struct cdev *dev; 205 char buf[SPECNAMELEN + 6]; 206 207 sc = cp->private; 208 if (strcmp(attr, "GEOM::media") == 0) { 209 dev = sc->sc_dev; 210 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 211 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 212 dev = sc->sc_alias; 213 if (dev != NULL) { 214 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 215 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, 216 M_WAITOK); 217 } 218 return; 219 } 220 221 if (strcmp(attr, "GEOM::physpath") != 0) 222 return; 223 224 if (g_access(cp, 1, 0, 0) == 0) { 225 char *physpath; 226 int error, physpath_len; 227 228 physpath_len = MAXPATHLEN; 229 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO); 230 error = 231 g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath); 232 g_access(cp, -1, 0, 0); 233 if (error == 0 && strlen(physpath) != 0) { 234 struct cdev *old_alias_dev; 235 struct cdev **alias_devp; 236 237 dev = sc->sc_dev; 238 old_alias_dev = sc->sc_alias; 239 alias_devp = (struct cdev **)&sc->sc_alias; 240 make_dev_physpath_alias(MAKEDEV_WAITOK, alias_devp, 241 dev, old_alias_dev, physpath); 242 } else if (sc->sc_alias) { 243 destroy_dev((struct cdev *)sc->sc_alias); 244 sc->sc_alias = NULL; 245 } 246 g_free(physpath); 247 } 248 } 249 250 struct g_provider * 251 g_dev_getprovider(struct cdev *dev) 252 { 253 struct g_consumer *cp; 254 255 g_topology_assert(); 256 if (dev == NULL) 257 return (NULL); 258 if (dev->si_devsw != &g_dev_cdevsw) 259 return (NULL); 260 cp = dev->si_drv2; 261 return (cp->provider); 262 } 263 264 static struct g_geom * 265 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 266 { 267 struct g_geom *gp; 268 struct g_consumer *cp; 269 struct g_dev_softc *sc; 270 int error, len; 271 struct cdev *dev, *adev; 272 char buf[64], *val; 273 274 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 275 g_topology_assert(); 276 gp = g_new_geomf(mp, "%s", pp->name); 277 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 278 mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF); 279 cp = g_new_consumer(gp); 280 cp->private = sc; 281 error = g_attach(cp, pp); 282 KASSERT(error == 0, 283 ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 284 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &dev, 285 &g_dev_cdevsw, NULL, UID_ROOT, GID_OPERATOR, 0640, "%s", gp->name); 286 if (error != 0) { 287 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n", 288 __func__, gp->name, error); 289 g_detach(cp); 290 g_destroy_consumer(cp); 291 g_destroy_geom(gp); 292 mtx_destroy(&sc->sc_mtx); 293 g_free(sc); 294 return (NULL); 295 } 296 dev->si_flags |= SI_UNMAPPED; 297 sc->sc_dev = dev; 298 299 /* Search for device alias name and create it if found. */ 300 adev = NULL; 301 for (len = MIN(strlen(gp->name), sizeof(buf) - 15); len > 0; len--) { 302 snprintf(buf, sizeof(buf), "kern.devalias.%s", gp->name); 303 buf[14 + len] = 0; 304 val = getenv(buf); 305 if (val != NULL) { 306 snprintf(buf, sizeof(buf), "%s%s", 307 val, gp->name + len); 308 freeenv(val); 309 make_dev_alias_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, 310 &adev, dev, "%s", buf); 311 adev->si_flags |= SI_UNMAPPED; 312 break; 313 } 314 } 315 316 if (pp->flags & G_PF_CANDELETE) 317 dev->si_flags |= SI_CANDELETE; 318 dev->si_iosize_max = MAXPHYS; 319 dev->si_drv2 = cp; 320 init_dumpdev(dev); 321 if (adev != NULL) { 322 if (pp->flags & G_PF_CANDELETE) 323 adev->si_flags |= SI_CANDELETE; 324 adev->si_iosize_max = MAXPHYS; 325 adev->si_drv2 = cp; 326 init_dumpdev(adev); 327 } 328 329 g_dev_attrchanged(cp, "GEOM::physpath"); 330 331 return (gp); 332 } 333 334 static int 335 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 336 { 337 struct g_consumer *cp; 338 struct g_dev_softc *sc; 339 int error, r, w, e; 340 341 cp = dev->si_drv2; 342 if (cp == NULL) 343 return(ENXIO); /* g_dev_taste() not done yet */ 344 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 345 cp->geom->name, flags, fmt, td); 346 347 r = flags & FREAD ? 1 : 0; 348 w = flags & FWRITE ? 1 : 0; 349 #ifdef notyet 350 e = flags & O_EXCL ? 1 : 0; 351 #else 352 e = 0; 353 #endif 354 if (w) { 355 /* 356 * When running in very secure mode, do not allow 357 * opens for writing of any disks. 358 */ 359 error = securelevel_ge(td->td_ucred, 2); 360 if (error) 361 return (error); 362 } 363 g_topology_lock(); 364 error = g_access(cp, r, w, e); 365 g_topology_unlock(); 366 if (error == 0) { 367 sc = cp->private; 368 mtx_lock(&sc->sc_mtx); 369 if (sc->sc_open == 0 && sc->sc_active != 0) 370 wakeup(&sc->sc_active); 371 sc->sc_open += r + w + e; 372 mtx_unlock(&sc->sc_mtx); 373 } 374 return(error); 375 } 376 377 static int 378 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 379 { 380 struct g_consumer *cp; 381 struct g_dev_softc *sc; 382 int error, r, w, e; 383 384 cp = dev->si_drv2; 385 if (cp == NULL) 386 return(ENXIO); 387 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 388 cp->geom->name, flags, fmt, td); 389 390 r = flags & FREAD ? -1 : 0; 391 w = flags & FWRITE ? -1 : 0; 392 #ifdef notyet 393 e = flags & O_EXCL ? -1 : 0; 394 #else 395 e = 0; 396 #endif 397 sc = cp->private; 398 mtx_lock(&sc->sc_mtx); 399 sc->sc_open += r + w + e; 400 while (sc->sc_open == 0 && sc->sc_active != 0) 401 msleep(&sc->sc_active, &sc->sc_mtx, 0, "PRIBIO", 0); 402 mtx_unlock(&sc->sc_mtx); 403 g_topology_lock(); 404 error = g_access(cp, r, w, e); 405 g_topology_unlock(); 406 return (error); 407 } 408 409 /* 410 * XXX: Until we have unmessed the ioctl situation, there is a race against 411 * XXX: a concurrent orphanization. We cannot close it by holding topology 412 * XXX: since that would prevent us from doing our job, and stalling events 413 * XXX: will break (actually: stall) the BSD disklabel hacks. 414 */ 415 static int 416 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 417 { 418 struct g_consumer *cp; 419 struct g_provider *pp; 420 off_t offset, length, chunk; 421 int i, error; 422 423 cp = dev->si_drv2; 424 pp = cp->provider; 425 426 error = 0; 427 KASSERT(cp->acr || cp->acw, 428 ("Consumer with zero access count in g_dev_ioctl")); 429 430 i = IOCPARM_LEN(cmd); 431 switch (cmd) { 432 case DIOCGSECTORSIZE: 433 *(u_int *)data = cp->provider->sectorsize; 434 if (*(u_int *)data == 0) 435 error = ENOENT; 436 break; 437 case DIOCGMEDIASIZE: 438 *(off_t *)data = cp->provider->mediasize; 439 if (*(off_t *)data == 0) 440 error = ENOENT; 441 break; 442 case DIOCGFWSECTORS: 443 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 444 if (error == 0 && *(u_int *)data == 0) 445 error = ENOENT; 446 break; 447 case DIOCGFWHEADS: 448 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 449 if (error == 0 && *(u_int *)data == 0) 450 error = ENOENT; 451 break; 452 case DIOCGFRONTSTUFF: 453 error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 454 break; 455 case DIOCSKERNELDUMP: 456 if (*(u_int *)data == 0) 457 error = g_dev_setdumpdev(NULL); 458 else 459 error = g_dev_setdumpdev(dev); 460 break; 461 case DIOCGFLUSH: 462 error = g_io_flush(cp); 463 break; 464 case DIOCGDELETE: 465 offset = ((off_t *)data)[0]; 466 length = ((off_t *)data)[1]; 467 if ((offset % cp->provider->sectorsize) != 0 || 468 (length % cp->provider->sectorsize) != 0 || length <= 0) { 469 printf("%s: offset=%jd length=%jd\n", __func__, offset, 470 length); 471 error = EINVAL; 472 break; 473 } 474 while (length > 0) { 475 chunk = length; 476 if (g_dev_del_max_sectors != 0 && chunk > 477 g_dev_del_max_sectors * cp->provider->sectorsize) { 478 chunk = g_dev_del_max_sectors * 479 cp->provider->sectorsize; 480 } 481 error = g_delete_data(cp, offset, chunk); 482 length -= chunk; 483 offset += chunk; 484 if (error) 485 break; 486 /* 487 * Since the request size can be large, the service 488 * time can be is likewise. We make this ioctl 489 * interruptible by checking for signals for each bio. 490 */ 491 if (SIGPENDING(td)) 492 break; 493 } 494 break; 495 case DIOCGIDENT: 496 error = g_io_getattr("GEOM::ident", cp, &i, data); 497 break; 498 case DIOCGPROVIDERNAME: 499 if (pp == NULL) 500 return (ENOENT); 501 strlcpy(data, pp->name, i); 502 break; 503 case DIOCGSTRIPESIZE: 504 *(off_t *)data = cp->provider->stripesize; 505 break; 506 case DIOCGSTRIPEOFFSET: 507 *(off_t *)data = cp->provider->stripeoffset; 508 break; 509 case DIOCGPHYSPATH: 510 error = g_io_getattr("GEOM::physpath", cp, &i, data); 511 if (error == 0 && *(char *)data == '\0') 512 error = ENOENT; 513 break; 514 default: 515 if (cp->provider->geom->ioctl != NULL) { 516 error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td); 517 } else { 518 error = ENOIOCTL; 519 } 520 } 521 522 return (error); 523 } 524 525 static void 526 g_dev_done(struct bio *bp2) 527 { 528 struct g_consumer *cp; 529 struct g_dev_softc *sc; 530 struct bio *bp; 531 int destroy; 532 533 cp = bp2->bio_from; 534 sc = cp->private; 535 bp = bp2->bio_parent; 536 bp->bio_error = bp2->bio_error; 537 bp->bio_completed = bp2->bio_completed; 538 bp->bio_resid = bp->bio_length - bp2->bio_completed; 539 if (bp2->bio_error != 0) { 540 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 541 bp2, bp2->bio_error); 542 bp->bio_flags |= BIO_ERROR; 543 } else { 544 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 545 bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed); 546 } 547 g_destroy_bio(bp2); 548 destroy = 0; 549 mtx_lock(&sc->sc_mtx); 550 if ((--sc->sc_active) == 0) { 551 if (sc->sc_open == 0) 552 wakeup(&sc->sc_active); 553 if (sc->sc_dev == NULL) 554 destroy = 1; 555 } 556 mtx_unlock(&sc->sc_mtx); 557 if (destroy) 558 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 559 biodone(bp); 560 } 561 562 static void 563 g_dev_strategy(struct bio *bp) 564 { 565 struct g_consumer *cp; 566 struct bio *bp2; 567 struct cdev *dev; 568 struct g_dev_softc *sc; 569 570 KASSERT(bp->bio_cmd == BIO_READ || 571 bp->bio_cmd == BIO_WRITE || 572 bp->bio_cmd == BIO_DELETE || 573 bp->bio_cmd == BIO_FLUSH, 574 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 575 dev = bp->bio_dev; 576 cp = dev->si_drv2; 577 sc = cp->private; 578 KASSERT(cp->acr || cp->acw, 579 ("Consumer with zero access count in g_dev_strategy")); 580 #ifdef INVARIANTS 581 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 582 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 583 bp->bio_resid = bp->bio_bcount; 584 biofinish(bp, NULL, EINVAL); 585 return; 586 } 587 #endif 588 mtx_lock(&sc->sc_mtx); 589 KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy")); 590 sc->sc_active++; 591 mtx_unlock(&sc->sc_mtx); 592 593 for (;;) { 594 /* 595 * XXX: This is not an ideal solution, but I belive it to 596 * XXX: deadlock safe, all things considered. 597 */ 598 bp2 = g_clone_bio(bp); 599 if (bp2 != NULL) 600 break; 601 pause("gdstrat", hz / 10); 602 } 603 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 604 bp2->bio_done = g_dev_done; 605 g_trace(G_T_BIO, 606 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 607 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 608 bp2->bio_data, bp2->bio_cmd); 609 g_io_request(bp2, cp); 610 KASSERT(cp->acr || cp->acw, 611 ("g_dev_strategy raced with g_dev_close and lost")); 612 613 } 614 615 /* 616 * g_dev_callback() 617 * 618 * Called by devfs when asynchronous device destruction is completed. 619 * - Mark that we have no attached device any more. 620 * - If there are no outstanding requests, schedule geom destruction. 621 * Otherwise destruction will be scheduled later by g_dev_done(). 622 */ 623 624 static void 625 g_dev_callback(void *arg) 626 { 627 struct g_consumer *cp; 628 struct g_dev_softc *sc; 629 int destroy; 630 631 cp = arg; 632 sc = cp->private; 633 g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name); 634 635 mtx_lock(&sc->sc_mtx); 636 sc->sc_dev = NULL; 637 sc->sc_alias = NULL; 638 destroy = (sc->sc_active == 0); 639 mtx_unlock(&sc->sc_mtx); 640 if (destroy) 641 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 642 } 643 644 /* 645 * g_dev_orphan() 646 * 647 * Called from below when the provider orphaned us. 648 * - Clear any dump settings. 649 * - Request asynchronous device destruction to prevent any more requests 650 * from coming in. The provider is already marked with an error, so 651 * anything which comes in in the interrim will be returned immediately. 652 */ 653 654 static void 655 g_dev_orphan(struct g_consumer *cp) 656 { 657 struct cdev *dev; 658 struct g_dev_softc *sc; 659 660 g_topology_assert(); 661 sc = cp->private; 662 dev = sc->sc_dev; 663 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name); 664 665 /* Reset any dump-area set on this device */ 666 if (dev->si_flags & SI_DUMPDEV) 667 set_dumper(NULL); 668 669 /* Destroy the struct cdev *so we get no more requests */ 670 destroy_dev_sched_cb(dev, g_dev_callback, cp); 671 } 672 673 DECLARE_GEOM_CLASS(g_dev_class, g_dev);
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