Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_dev.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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: releng/10.2/sys/geom/geom_dev.c 282953 2015-05-15 10:42:48Z trasz $"); 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, 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, devtoname(dev)); 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 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 = getenv(buf); 312 if (val != NULL) { 313 snprintf(buf, sizeof(buf), "%s%s", 314 val, gp->name + len); 315 freeenv(val); 316 make_dev_alias_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, 317 &adev, dev, "%s", buf); 318 adev->si_flags |= SI_UNMAPPED; 319 break; 320 } 321 } 322 323 dev->si_iosize_max = MAXPHYS; 324 dev->si_drv2 = cp; 325 init_dumpdev(dev); 326 if (adev != NULL) { 327 adev->si_iosize_max = MAXPHYS; 328 adev->si_drv2 = cp; 329 init_dumpdev(adev); 330 } 331 332 g_dev_attrchanged(cp, "GEOM::physpath"); 333 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 334 devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK); 335 336 return (gp); 337 } 338 339 static int 340 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 341 { 342 struct g_consumer *cp; 343 struct g_dev_softc *sc; 344 int error, r, w, e; 345 346 cp = dev->si_drv2; 347 if (cp == NULL) 348 return(ENXIO); /* g_dev_taste() not done yet */ 349 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 350 cp->geom->name, flags, fmt, td); 351 352 r = flags & FREAD ? 1 : 0; 353 w = flags & FWRITE ? 1 : 0; 354 #ifdef notyet 355 e = flags & O_EXCL ? 1 : 0; 356 #else 357 e = 0; 358 #endif 359 if (w) { 360 /* 361 * When running in very secure mode, do not allow 362 * opens for writing of any disks. 363 */ 364 error = securelevel_ge(td->td_ucred, 2); 365 if (error) 366 return (error); 367 } 368 g_topology_lock(); 369 error = g_access(cp, r, w, e); 370 g_topology_unlock(); 371 if (error == 0) { 372 sc = cp->private; 373 mtx_lock(&sc->sc_mtx); 374 if (sc->sc_open == 0 && sc->sc_active != 0) 375 wakeup(&sc->sc_active); 376 sc->sc_open += r + w + e; 377 mtx_unlock(&sc->sc_mtx); 378 } 379 return(error); 380 } 381 382 static int 383 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 384 { 385 struct g_consumer *cp; 386 struct g_dev_softc *sc; 387 int error, r, w, e; 388 389 cp = dev->si_drv2; 390 if (cp == NULL) 391 return(ENXIO); 392 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 393 cp->geom->name, flags, fmt, td); 394 395 r = flags & FREAD ? -1 : 0; 396 w = flags & FWRITE ? -1 : 0; 397 #ifdef notyet 398 e = flags & O_EXCL ? -1 : 0; 399 #else 400 e = 0; 401 #endif 402 sc = cp->private; 403 mtx_lock(&sc->sc_mtx); 404 sc->sc_open += r + w + e; 405 while (sc->sc_open == 0 && sc->sc_active != 0) 406 msleep(&sc->sc_active, &sc->sc_mtx, 0, "PRIBIO", 0); 407 mtx_unlock(&sc->sc_mtx); 408 g_topology_lock(); 409 error = g_access(cp, r, w, e); 410 g_topology_unlock(); 411 return (error); 412 } 413 414 /* 415 * XXX: Until we have unmessed the ioctl situation, there is a race against 416 * XXX: a concurrent orphanization. We cannot close it by holding topology 417 * XXX: since that would prevent us from doing our job, and stalling events 418 * XXX: will break (actually: stall) the BSD disklabel hacks. 419 */ 420 static int 421 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 422 { 423 struct g_consumer *cp; 424 struct g_provider *pp; 425 off_t offset, length, chunk; 426 int i, error; 427 428 cp = dev->si_drv2; 429 pp = cp->provider; 430 431 error = 0; 432 KASSERT(cp->acr || cp->acw, 433 ("Consumer with zero access count in g_dev_ioctl")); 434 435 i = IOCPARM_LEN(cmd); 436 switch (cmd) { 437 case DIOCGSECTORSIZE: 438 *(u_int *)data = cp->provider->sectorsize; 439 if (*(u_int *)data == 0) 440 error = ENOENT; 441 break; 442 case DIOCGMEDIASIZE: 443 *(off_t *)data = cp->provider->mediasize; 444 if (*(off_t *)data == 0) 445 error = ENOENT; 446 break; 447 case DIOCGFWSECTORS: 448 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 449 if (error == 0 && *(u_int *)data == 0) 450 error = ENOENT; 451 break; 452 case DIOCGFWHEADS: 453 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 454 if (error == 0 && *(u_int *)data == 0) 455 error = ENOENT; 456 break; 457 case DIOCGFRONTSTUFF: 458 error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 459 break; 460 case DIOCSKERNELDUMP: 461 if (*(u_int *)data == 0) 462 error = g_dev_setdumpdev(NULL); 463 else 464 error = g_dev_setdumpdev(dev); 465 break; 466 case DIOCGFLUSH: 467 error = g_io_flush(cp); 468 break; 469 case DIOCGDELETE: 470 offset = ((off_t *)data)[0]; 471 length = ((off_t *)data)[1]; 472 if ((offset % cp->provider->sectorsize) != 0 || 473 (length % cp->provider->sectorsize) != 0 || length <= 0) { 474 printf("%s: offset=%jd length=%jd\n", __func__, offset, 475 length); 476 error = EINVAL; 477 break; 478 } 479 while (length > 0) { 480 chunk = length; 481 if (g_dev_del_max_sectors != 0 && chunk > 482 g_dev_del_max_sectors * cp->provider->sectorsize) { 483 chunk = g_dev_del_max_sectors * 484 cp->provider->sectorsize; 485 } 486 error = g_delete_data(cp, offset, chunk); 487 length -= chunk; 488 offset += chunk; 489 if (error) 490 break; 491 /* 492 * Since the request size can be large, the service 493 * time can be is likewise. We make this ioctl 494 * interruptible by checking for signals for each bio. 495 */ 496 if (SIGPENDING(td)) 497 break; 498 } 499 break; 500 case DIOCGIDENT: 501 error = g_io_getattr("GEOM::ident", cp, &i, data); 502 break; 503 case DIOCGPROVIDERNAME: 504 if (pp == NULL) 505 return (ENOENT); 506 strlcpy(data, pp->name, i); 507 break; 508 case DIOCGSTRIPESIZE: 509 *(off_t *)data = cp->provider->stripesize; 510 break; 511 case DIOCGSTRIPEOFFSET: 512 *(off_t *)data = cp->provider->stripeoffset; 513 break; 514 case DIOCGPHYSPATH: 515 error = g_io_getattr("GEOM::physpath", cp, &i, data); 516 if (error == 0 && *(char *)data == '\0') 517 error = ENOENT; 518 break; 519 case DIOCGATTR: { 520 struct diocgattr_arg *arg = (struct diocgattr_arg *)data; 521 522 if (arg->len > sizeof(arg->value)) { 523 error = EINVAL; 524 break; 525 } 526 error = g_io_getattr(arg->name, cp, &arg->len, &arg->value); 527 break; 528 } 529 default: 530 if (cp->provider->geom->ioctl != NULL) { 531 error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td); 532 } else { 533 error = ENOIOCTL; 534 } 535 } 536 537 return (error); 538 } 539 540 static void 541 g_dev_done(struct bio *bp2) 542 { 543 struct g_consumer *cp; 544 struct g_dev_softc *sc; 545 struct bio *bp; 546 int destroy; 547 548 cp = bp2->bio_from; 549 sc = cp->private; 550 bp = bp2->bio_parent; 551 bp->bio_error = bp2->bio_error; 552 bp->bio_completed = bp2->bio_completed; 553 bp->bio_resid = bp->bio_length - bp2->bio_completed; 554 if (bp2->bio_error != 0) { 555 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 556 bp2, bp2->bio_error); 557 bp->bio_flags |= BIO_ERROR; 558 } else { 559 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 560 bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed); 561 } 562 g_destroy_bio(bp2); 563 destroy = 0; 564 mtx_lock(&sc->sc_mtx); 565 if ((--sc->sc_active) == 0) { 566 if (sc->sc_open == 0) 567 wakeup(&sc->sc_active); 568 if (sc->sc_dev == NULL) 569 destroy = 1; 570 } 571 mtx_unlock(&sc->sc_mtx); 572 if (destroy) 573 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 574 biodone(bp); 575 } 576 577 static void 578 g_dev_strategy(struct bio *bp) 579 { 580 struct g_consumer *cp; 581 struct bio *bp2; 582 struct cdev *dev; 583 struct g_dev_softc *sc; 584 585 KASSERT(bp->bio_cmd == BIO_READ || 586 bp->bio_cmd == BIO_WRITE || 587 bp->bio_cmd == BIO_DELETE || 588 bp->bio_cmd == BIO_FLUSH, 589 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 590 dev = bp->bio_dev; 591 cp = dev->si_drv2; 592 sc = cp->private; 593 KASSERT(cp->acr || cp->acw, 594 ("Consumer with zero access count in g_dev_strategy")); 595 #ifdef INVARIANTS 596 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 597 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 598 bp->bio_resid = bp->bio_bcount; 599 biofinish(bp, NULL, EINVAL); 600 return; 601 } 602 #endif 603 mtx_lock(&sc->sc_mtx); 604 KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy")); 605 sc->sc_active++; 606 mtx_unlock(&sc->sc_mtx); 607 608 for (;;) { 609 /* 610 * XXX: This is not an ideal solution, but I belive it to 611 * XXX: deadlock safe, all things considered. 612 */ 613 bp2 = g_clone_bio(bp); 614 if (bp2 != NULL) 615 break; 616 pause("gdstrat", hz / 10); 617 } 618 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 619 bp2->bio_done = g_dev_done; 620 g_trace(G_T_BIO, 621 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 622 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 623 bp2->bio_data, bp2->bio_cmd); 624 g_io_request(bp2, cp); 625 KASSERT(cp->acr || cp->acw, 626 ("g_dev_strategy raced with g_dev_close and lost")); 627 628 } 629 630 /* 631 * g_dev_callback() 632 * 633 * Called by devfs when asynchronous device destruction is completed. 634 * - Mark that we have no attached device any more. 635 * - If there are no outstanding requests, schedule geom destruction. 636 * Otherwise destruction will be scheduled later by g_dev_done(). 637 */ 638 639 static void 640 g_dev_callback(void *arg) 641 { 642 struct g_consumer *cp; 643 struct g_dev_softc *sc; 644 int destroy; 645 646 cp = arg; 647 sc = cp->private; 648 g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name); 649 650 mtx_lock(&sc->sc_mtx); 651 sc->sc_dev = NULL; 652 sc->sc_alias = NULL; 653 destroy = (sc->sc_active == 0); 654 mtx_unlock(&sc->sc_mtx); 655 if (destroy) 656 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 657 } 658 659 /* 660 * g_dev_orphan() 661 * 662 * Called from below when the provider orphaned us. 663 * - Clear any dump settings. 664 * - Request asynchronous device destruction to prevent any more requests 665 * from coming in. The provider is already marked with an error, so 666 * anything which comes in in the interrim will be returned immediately. 667 */ 668 669 static void 670 g_dev_orphan(struct g_consumer *cp) 671 { 672 struct cdev *dev; 673 struct g_dev_softc *sc; 674 675 g_topology_assert(); 676 sc = cp->private; 677 dev = sc->sc_dev; 678 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name); 679 680 /* Reset any dump-area set on this device */ 681 if (dev->si_flags & SI_DUMPDEV) 682 set_dumper(NULL, NULL); 683 684 /* Destroy the struct cdev *so we get no more requests */ 685 destroy_dev_sched_cb(dev, g_dev_callback, cp); 686 } 687 688 DECLARE_GEOM_CLASS(g_dev_class, g_dev);
Cache object: 1d7306605af1470ba5743fc00d596e2a
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]