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 = kern_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, struct thread *td) 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, NULL, td)); 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, devtoname(dev), td); 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, curthread) == 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 char buf[SPECNAMELEN + 6]; 173 174 g_topology_assert(); 175 cp = arg; 176 gp = cp->geom; 177 sc = cp->private; 178 g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name); 179 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 180 devctl_notify_f("GEOM", "DEV", "DESTROY", buf, M_WAITOK); 181 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 182 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 183 g_detach(cp); 184 g_destroy_consumer(cp); 185 g_destroy_geom(gp); 186 mtx_destroy(&sc->sc_mtx); 187 g_free(sc); 188 } 189 190 void 191 g_dev_print(void) 192 { 193 struct g_geom *gp; 194 char const *p = ""; 195 196 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 197 printf("%s%s", p, gp->name); 198 p = " "; 199 } 200 printf("\n"); 201 } 202 203 static void 204 g_dev_attrchanged(struct g_consumer *cp, const char *attr) 205 { 206 struct g_dev_softc *sc; 207 struct cdev *dev; 208 char buf[SPECNAMELEN + 6]; 209 210 sc = cp->private; 211 if (strcmp(attr, "GEOM::media") == 0) { 212 dev = sc->sc_dev; 213 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 214 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 215 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK); 216 dev = sc->sc_alias; 217 if (dev != NULL) { 218 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 219 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, 220 M_WAITOK); 221 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, 222 M_WAITOK); 223 } 224 return; 225 } 226 227 if (strcmp(attr, "GEOM::physpath") != 0) 228 return; 229 230 if (g_access(cp, 1, 0, 0) == 0) { 231 char *physpath; 232 int error, physpath_len; 233 234 physpath_len = MAXPATHLEN; 235 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO); 236 error = 237 g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath); 238 g_access(cp, -1, 0, 0); 239 if (error == 0 && strlen(physpath) != 0) { 240 struct cdev *old_alias_dev; 241 struct cdev **alias_devp; 242 243 dev = sc->sc_dev; 244 old_alias_dev = sc->sc_alias; 245 alias_devp = (struct cdev **)&sc->sc_alias; 246 make_dev_physpath_alias(MAKEDEV_WAITOK, alias_devp, 247 dev, old_alias_dev, physpath); 248 } else if (sc->sc_alias) { 249 destroy_dev((struct cdev *)sc->sc_alias); 250 sc->sc_alias = NULL; 251 } 252 g_free(physpath); 253 } 254 } 255 256 struct g_provider * 257 g_dev_getprovider(struct cdev *dev) 258 { 259 struct g_consumer *cp; 260 261 g_topology_assert(); 262 if (dev == NULL) 263 return (NULL); 264 if (dev->si_devsw != &g_dev_cdevsw) 265 return (NULL); 266 cp = dev->si_drv2; 267 return (cp->provider); 268 } 269 270 static struct g_geom * 271 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 272 { 273 struct g_geom *gp; 274 struct g_consumer *cp; 275 struct g_dev_softc *sc; 276 int error, len; 277 struct cdev *dev, *adev; 278 char buf[SPECNAMELEN + 6], *val; 279 280 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 281 g_topology_assert(); 282 gp = g_new_geomf(mp, "%s", pp->name); 283 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 284 mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF); 285 cp = g_new_consumer(gp); 286 cp->private = sc; 287 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 288 error = g_attach(cp, pp); 289 KASSERT(error == 0, 290 ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 291 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &dev, 292 &g_dev_cdevsw, NULL, UID_ROOT, GID_OPERATOR, 0640, "%s", gp->name); 293 if (error != 0) { 294 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n", 295 __func__, gp->name, error); 296 g_detach(cp); 297 g_destroy_consumer(cp); 298 g_destroy_geom(gp); 299 mtx_destroy(&sc->sc_mtx); 300 g_free(sc); 301 return (NULL); 302 } 303 dev->si_flags |= SI_UNMAPPED; 304 sc->sc_dev = dev; 305 306 /* Search for device alias name and create it if found. */ 307 adev = NULL; 308 for (len = MIN(strlen(gp->name), sizeof(buf) - 15); len > 0; len--) { 309 snprintf(buf, sizeof(buf), "kern.devalias.%s", gp->name); 310 buf[14 + len] = 0; 311 val = kern_getenv(buf); 312 if (val != NULL) { 313 snprintf(buf, sizeof(buf), "%s%s", 314 val, gp->name + len); 315 freeenv(val); 316 if ((make_dev_alias_p(MAKEDEV_CHECKNAME|MAKEDEV_WAITOK, 317 &adev, dev, "%s", buf)) != 0) 318 printf("Warning: unable to create device " 319 "alias %s\n", buf); 320 break; 321 } 322 } 323 324 dev->si_iosize_max = MAXPHYS; 325 dev->si_drv2 = cp; 326 init_dumpdev(dev); 327 if (adev != NULL) { 328 adev->si_iosize_max = MAXPHYS; 329 adev->si_drv2 = cp; 330 adev->si_flags |= SI_UNMAPPED; 331 init_dumpdev(adev); 332 } 333 334 g_dev_attrchanged(cp, "GEOM::physpath"); 335 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 336 devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK); 337 338 return (gp); 339 } 340 341 static int 342 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 343 { 344 struct g_consumer *cp; 345 struct g_dev_softc *sc; 346 int error, r, w, e; 347 348 cp = dev->si_drv2; 349 if (cp == NULL) 350 return (ENXIO); /* g_dev_taste() not done yet */ 351 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 352 cp->geom->name, flags, fmt, td); 353 354 r = flags & FREAD ? 1 : 0; 355 w = flags & FWRITE ? 1 : 0; 356 #ifdef notyet 357 e = flags & O_EXCL ? 1 : 0; 358 #else 359 e = 0; 360 #endif 361 if (w) { 362 /* 363 * When running in very secure mode, do not allow 364 * opens for writing of any disks. 365 */ 366 error = securelevel_ge(td->td_ucred, 2); 367 if (error) 368 return (error); 369 } 370 g_topology_lock(); 371 error = g_access(cp, r, w, e); 372 g_topology_unlock(); 373 if (error == 0) { 374 sc = cp->private; 375 mtx_lock(&sc->sc_mtx); 376 if (sc->sc_open == 0 && sc->sc_active != 0) 377 wakeup(&sc->sc_active); 378 sc->sc_open += r + w + e; 379 mtx_unlock(&sc->sc_mtx); 380 } 381 return (error); 382 } 383 384 static int 385 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 386 { 387 struct g_consumer *cp; 388 struct g_dev_softc *sc; 389 int error, r, w, e; 390 391 cp = dev->si_drv2; 392 if (cp == NULL) 393 return (ENXIO); 394 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 395 cp->geom->name, flags, fmt, td); 396 397 r = flags & FREAD ? -1 : 0; 398 w = flags & FWRITE ? -1 : 0; 399 #ifdef notyet 400 e = flags & O_EXCL ? -1 : 0; 401 #else 402 e = 0; 403 #endif 404 sc = cp->private; 405 mtx_lock(&sc->sc_mtx); 406 sc->sc_open += r + w + e; 407 while (sc->sc_open == 0 && sc->sc_active != 0) 408 msleep(&sc->sc_active, &sc->sc_mtx, 0, "PRIBIO", 0); 409 mtx_unlock(&sc->sc_mtx); 410 g_topology_lock(); 411 error = g_access(cp, r, w, e); 412 g_topology_unlock(); 413 return (error); 414 } 415 416 /* 417 * XXX: Until we have unmessed the ioctl situation, there is a race against 418 * XXX: a concurrent orphanization. We cannot close it by holding topology 419 * XXX: since that would prevent us from doing our job, and stalling events 420 * XXX: will break (actually: stall) the BSD disklabel hacks. 421 */ 422 static int 423 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 424 { 425 struct g_consumer *cp; 426 struct g_provider *pp; 427 off_t offset, length, chunk; 428 int i, error; 429 430 cp = dev->si_drv2; 431 pp = cp->provider; 432 433 error = 0; 434 KASSERT(cp->acr || cp->acw, 435 ("Consumer with zero access count in g_dev_ioctl")); 436 437 i = IOCPARM_LEN(cmd); 438 switch (cmd) { 439 case DIOCGSECTORSIZE: 440 *(u_int *)data = cp->provider->sectorsize; 441 if (*(u_int *)data == 0) 442 error = ENOENT; 443 break; 444 case DIOCGMEDIASIZE: 445 *(off_t *)data = cp->provider->mediasize; 446 if (*(off_t *)data == 0) 447 error = ENOENT; 448 break; 449 case DIOCGFWSECTORS: 450 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 451 if (error == 0 && *(u_int *)data == 0) 452 error = ENOENT; 453 break; 454 case DIOCGFWHEADS: 455 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 456 if (error == 0 && *(u_int *)data == 0) 457 error = ENOENT; 458 break; 459 case DIOCGFRONTSTUFF: 460 error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 461 break; 462 case DIOCSKERNELDUMP: 463 if (*(u_int *)data == 0) 464 error = g_dev_setdumpdev(NULL, td); 465 else 466 error = g_dev_setdumpdev(dev, td); 467 break; 468 case DIOCGFLUSH: 469 error = g_io_flush(cp); 470 break; 471 case DIOCGDELETE: 472 offset = ((off_t *)data)[0]; 473 length = ((off_t *)data)[1]; 474 if ((offset % cp->provider->sectorsize) != 0 || 475 (length % cp->provider->sectorsize) != 0 || length <= 0) { 476 printf("%s: offset=%jd length=%jd\n", __func__, offset, 477 length); 478 error = EINVAL; 479 break; 480 } 481 while (length > 0) { 482 chunk = length; 483 if (g_dev_del_max_sectors != 0 && chunk > 484 g_dev_del_max_sectors * cp->provider->sectorsize) { 485 chunk = g_dev_del_max_sectors * 486 cp->provider->sectorsize; 487 } 488 error = g_delete_data(cp, offset, chunk); 489 length -= chunk; 490 offset += chunk; 491 if (error) 492 break; 493 /* 494 * Since the request size can be large, the service 495 * time can be is likewise. We make this ioctl 496 * interruptible by checking for signals for each bio. 497 */ 498 if (SIGPENDING(td)) 499 break; 500 } 501 break; 502 case DIOCGIDENT: 503 error = g_io_getattr("GEOM::ident", cp, &i, data); 504 break; 505 case DIOCGPROVIDERNAME: 506 if (pp == NULL) 507 return (ENOENT); 508 strlcpy(data, pp->name, i); 509 break; 510 case DIOCGSTRIPESIZE: 511 *(off_t *)data = cp->provider->stripesize; 512 break; 513 case DIOCGSTRIPEOFFSET: 514 *(off_t *)data = cp->provider->stripeoffset; 515 break; 516 case DIOCGPHYSPATH: 517 error = g_io_getattr("GEOM::physpath", cp, &i, data); 518 if (error == 0 && *(char *)data == '\0') 519 error = ENOENT; 520 break; 521 case DIOCGATTR: { 522 struct diocgattr_arg *arg = (struct diocgattr_arg *)data; 523 524 if (arg->len > sizeof(arg->value)) { 525 error = EINVAL; 526 break; 527 } 528 error = g_io_getattr(arg->name, cp, &arg->len, &arg->value); 529 break; 530 } 531 default: 532 if (cp->provider->geom->ioctl != NULL) { 533 error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td); 534 } else { 535 error = ENOIOCTL; 536 } 537 } 538 539 return (error); 540 } 541 542 static void 543 g_dev_done(struct bio *bp2) 544 { 545 struct g_consumer *cp; 546 struct g_dev_softc *sc; 547 struct bio *bp; 548 int destroy; 549 550 cp = bp2->bio_from; 551 sc = cp->private; 552 bp = bp2->bio_parent; 553 bp->bio_error = bp2->bio_error; 554 bp->bio_completed = bp2->bio_completed; 555 bp->bio_resid = bp->bio_length - bp2->bio_completed; 556 if (bp2->bio_error != 0) { 557 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 558 bp2, bp2->bio_error); 559 bp->bio_flags |= BIO_ERROR; 560 } else { 561 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 562 bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed); 563 } 564 g_destroy_bio(bp2); 565 destroy = 0; 566 mtx_lock(&sc->sc_mtx); 567 if ((--sc->sc_active) == 0) { 568 if (sc->sc_open == 0) 569 wakeup(&sc->sc_active); 570 if (sc->sc_dev == NULL) 571 destroy = 1; 572 } 573 mtx_unlock(&sc->sc_mtx); 574 if (destroy) 575 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 576 biodone(bp); 577 } 578 579 static void 580 g_dev_strategy(struct bio *bp) 581 { 582 struct g_consumer *cp; 583 struct bio *bp2; 584 struct cdev *dev; 585 struct g_dev_softc *sc; 586 587 KASSERT(bp->bio_cmd == BIO_READ || 588 bp->bio_cmd == BIO_WRITE || 589 bp->bio_cmd == BIO_DELETE || 590 bp->bio_cmd == BIO_FLUSH, 591 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 592 dev = bp->bio_dev; 593 cp = dev->si_drv2; 594 sc = cp->private; 595 KASSERT(cp->acr || cp->acw, 596 ("Consumer with zero access count in g_dev_strategy")); 597 #ifdef INVARIANTS 598 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 599 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 600 bp->bio_resid = bp->bio_bcount; 601 biofinish(bp, NULL, EINVAL); 602 return; 603 } 604 #endif 605 mtx_lock(&sc->sc_mtx); 606 KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy")); 607 sc->sc_active++; 608 mtx_unlock(&sc->sc_mtx); 609 610 for (;;) { 611 /* 612 * XXX: This is not an ideal solution, but I belive it to 613 * XXX: deadlock safe, all things considered. 614 */ 615 bp2 = g_clone_bio(bp); 616 if (bp2 != NULL) 617 break; 618 pause("gdstrat", hz / 10); 619 } 620 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 621 bp2->bio_done = g_dev_done; 622 g_trace(G_T_BIO, 623 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 624 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 625 bp2->bio_data, bp2->bio_cmd); 626 g_io_request(bp2, cp); 627 KASSERT(cp->acr || cp->acw, 628 ("g_dev_strategy raced with g_dev_close and lost")); 629 630 } 631 632 /* 633 * g_dev_callback() 634 * 635 * Called by devfs when asynchronous device destruction is completed. 636 * - Mark that we have no attached device any more. 637 * - If there are no outstanding requests, schedule geom destruction. 638 * Otherwise destruction will be scheduled later by g_dev_done(). 639 */ 640 641 static void 642 g_dev_callback(void *arg) 643 { 644 struct g_consumer *cp; 645 struct g_dev_softc *sc; 646 int destroy; 647 648 cp = arg; 649 sc = cp->private; 650 g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name); 651 652 mtx_lock(&sc->sc_mtx); 653 sc->sc_dev = NULL; 654 sc->sc_alias = NULL; 655 destroy = (sc->sc_active == 0); 656 mtx_unlock(&sc->sc_mtx); 657 if (destroy) 658 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 659 } 660 661 /* 662 * g_dev_orphan() 663 * 664 * Called from below when the provider orphaned us. 665 * - Clear any dump settings. 666 * - Request asynchronous device destruction to prevent any more requests 667 * from coming in. The provider is already marked with an error, so 668 * anything which comes in in the interrim will be returned immediately. 669 */ 670 671 static void 672 g_dev_orphan(struct g_consumer *cp) 673 { 674 struct cdev *dev; 675 struct g_dev_softc *sc; 676 677 g_topology_assert(); 678 sc = cp->private; 679 dev = sc->sc_dev; 680 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name); 681 682 /* Reset any dump-area set on this device */ 683 if (dev->si_flags & SI_DUMPDEV) 684 (void)set_dumper(NULL, NULL, curthread); 685 686 /* Destroy the struct cdev *so we get no more requests */ 687 destroy_dev_sched_cb(dev, g_dev_callback, cp); 688 } 689 690 DECLARE_GEOM_CLASS(g_dev_class, g_dev); 691