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: releng/11.2/sys/geom/geom_dev.c 315704 2017-03-22 07:53:57Z mav $"); 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 dumpdev = NULL; 128 } 129 130 static int 131 g_dev_setdumpdev(struct cdev *dev, struct thread *td) 132 { 133 struct g_kerneldump kd; 134 struct g_consumer *cp; 135 int error, len; 136 137 if (dev == NULL) 138 return (set_dumper(NULL, NULL, td)); 139 140 cp = dev->si_drv2; 141 len = sizeof(kd); 142 kd.offset = 0; 143 kd.length = OFF_MAX; 144 error = g_io_getattr("GEOM::kerneldump", cp, &len, &kd); 145 if (error == 0) { 146 error = set_dumper(&kd.di, devtoname(dev), td); 147 if (error == 0) 148 dev->si_flags |= SI_DUMPDEV; 149 } 150 return (error); 151 } 152 153 static int 154 init_dumpdev(struct cdev *dev) 155 { 156 struct g_consumer *cp; 157 const char *devprefix = "/dev/", *devname; 158 int error; 159 size_t len; 160 161 if (dumpdev == NULL) 162 return (0); 163 164 len = strlen(devprefix); 165 devname = devtoname(dev); 166 if (strcmp(devname, dumpdev) != 0 && 167 (strncmp(dumpdev, devprefix, len) != 0 || 168 strcmp(devname, dumpdev + len) != 0)) 169 return (0); 170 171 cp = (struct g_consumer *)dev->si_drv2; 172 error = g_access(cp, 1, 0, 0); 173 if (error != 0) 174 return (error); 175 176 error = g_dev_setdumpdev(dev, curthread); 177 if (error == 0) { 178 freeenv(dumpdev); 179 dumpdev = NULL; 180 } 181 182 (void)g_access(cp, -1, 0, 0); 183 184 return (error); 185 } 186 187 static void 188 g_dev_destroy(void *arg, int flags __unused) 189 { 190 struct g_consumer *cp; 191 struct g_geom *gp; 192 struct g_dev_softc *sc; 193 char buf[SPECNAMELEN + 6]; 194 195 g_topology_assert(); 196 cp = arg; 197 gp = cp->geom; 198 sc = cp->private; 199 g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name); 200 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 201 devctl_notify_f("GEOM", "DEV", "DESTROY", buf, M_WAITOK); 202 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 203 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 204 g_detach(cp); 205 g_destroy_consumer(cp); 206 g_destroy_geom(gp); 207 mtx_destroy(&sc->sc_mtx); 208 g_free(sc); 209 } 210 211 void 212 g_dev_print(void) 213 { 214 struct g_geom *gp; 215 char const *p = ""; 216 217 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 218 printf("%s%s", p, gp->name); 219 p = " "; 220 } 221 printf("\n"); 222 } 223 224 static void 225 g_dev_set_physpath(struct g_consumer *cp) 226 { 227 struct g_dev_softc *sc; 228 char *physpath; 229 int error, physpath_len; 230 231 if (g_access(cp, 1, 0, 0) != 0) 232 return; 233 234 sc = cp->private; 235 physpath_len = MAXPATHLEN; 236 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO); 237 error = 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 *dev, *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, dev, 247 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 static void 256 g_dev_set_media(struct g_consumer *cp) 257 { 258 struct g_dev_softc *sc; 259 struct cdev *dev; 260 char buf[SPECNAMELEN + 6]; 261 262 sc = cp->private; 263 dev = sc->sc_dev; 264 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 265 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 266 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK); 267 dev = sc->sc_alias; 268 if (dev != NULL) { 269 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 270 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 271 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK); 272 } 273 } 274 275 static void 276 g_dev_attrchanged(struct g_consumer *cp, const char *attr) 277 { 278 279 if (strcmp(attr, "GEOM::media") == 0) { 280 g_dev_set_media(cp); 281 return; 282 } 283 284 if (strcmp(attr, "GEOM::physpath") == 0) { 285 g_dev_set_physpath(cp); 286 return; 287 } 288 } 289 290 struct g_provider * 291 g_dev_getprovider(struct cdev *dev) 292 { 293 struct g_consumer *cp; 294 295 g_topology_assert(); 296 if (dev == NULL) 297 return (NULL); 298 if (dev->si_devsw != &g_dev_cdevsw) 299 return (NULL); 300 cp = dev->si_drv2; 301 return (cp->provider); 302 } 303 304 static struct g_geom * 305 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 306 { 307 struct g_geom *gp; 308 struct g_consumer *cp; 309 struct g_dev_softc *sc; 310 int error; 311 struct cdev *dev; 312 char buf[SPECNAMELEN + 6]; 313 314 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 315 g_topology_assert(); 316 gp = g_new_geomf(mp, "%s", pp->name); 317 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 318 mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF); 319 cp = g_new_consumer(gp); 320 cp->private = sc; 321 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 322 error = g_attach(cp, pp); 323 KASSERT(error == 0, 324 ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 325 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &dev, 326 &g_dev_cdevsw, NULL, UID_ROOT, GID_OPERATOR, 0640, "%s", gp->name); 327 if (error != 0) { 328 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n", 329 __func__, gp->name, error); 330 g_detach(cp); 331 g_destroy_consumer(cp); 332 g_destroy_geom(gp); 333 mtx_destroy(&sc->sc_mtx); 334 g_free(sc); 335 return (NULL); 336 } 337 dev->si_flags |= SI_UNMAPPED; 338 sc->sc_dev = dev; 339 340 dev->si_iosize_max = MAXPHYS; 341 dev->si_drv2 = cp; 342 error = init_dumpdev(dev); 343 if (error != 0) 344 printf("%s: init_dumpdev() failed (gp->name=%s, error=%d)\n", 345 __func__, gp->name, error); 346 347 g_dev_attrchanged(cp, "GEOM::physpath"); 348 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 349 devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK); 350 351 return (gp); 352 } 353 354 static int 355 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 356 { 357 struct g_consumer *cp; 358 struct g_dev_softc *sc; 359 int error, r, w, e; 360 361 cp = dev->si_drv2; 362 if (cp == NULL) 363 return (ENXIO); /* g_dev_taste() not done yet */ 364 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 365 cp->geom->name, flags, fmt, td); 366 367 r = flags & FREAD ? 1 : 0; 368 w = flags & FWRITE ? 1 : 0; 369 #ifdef notyet 370 e = flags & O_EXCL ? 1 : 0; 371 #else 372 e = 0; 373 #endif 374 375 /* 376 * This happens on attempt to open a device node with O_EXEC. 377 */ 378 if (r + w + e == 0) 379 return (EINVAL); 380 381 if (w) { 382 /* 383 * When running in very secure mode, do not allow 384 * opens for writing of any disks. 385 */ 386 error = securelevel_ge(td->td_ucred, 2); 387 if (error) 388 return (error); 389 } 390 g_topology_lock(); 391 error = g_access(cp, r, w, e); 392 g_topology_unlock(); 393 if (error == 0) { 394 sc = cp->private; 395 mtx_lock(&sc->sc_mtx); 396 if (sc->sc_open == 0 && sc->sc_active != 0) 397 wakeup(&sc->sc_active); 398 sc->sc_open += r + w + e; 399 mtx_unlock(&sc->sc_mtx); 400 } 401 return (error); 402 } 403 404 static int 405 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 406 { 407 struct g_consumer *cp; 408 struct g_dev_softc *sc; 409 int error, r, w, e; 410 411 cp = dev->si_drv2; 412 if (cp == NULL) 413 return (ENXIO); 414 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 415 cp->geom->name, flags, fmt, td); 416 417 r = flags & FREAD ? -1 : 0; 418 w = flags & FWRITE ? -1 : 0; 419 #ifdef notyet 420 e = flags & O_EXCL ? -1 : 0; 421 #else 422 e = 0; 423 #endif 424 425 /* 426 * The vgonel(9) - caused by eg. forced unmount of devfs - calls 427 * VOP_CLOSE(9) on devfs vnode without any FREAD or FWRITE flags, 428 * which would result in zero deltas, which in turn would cause 429 * panic in g_access(9). 430 * 431 * Note that we cannot zero the counters (ie. do "r = cp->acr" 432 * etc) instead, because the consumer might be opened in another 433 * devfs instance. 434 */ 435 if (r + w + e == 0) 436 return (EINVAL); 437 438 sc = cp->private; 439 mtx_lock(&sc->sc_mtx); 440 sc->sc_open += r + w + e; 441 while (sc->sc_open == 0 && sc->sc_active != 0) 442 msleep(&sc->sc_active, &sc->sc_mtx, 0, "PRIBIO", 0); 443 mtx_unlock(&sc->sc_mtx); 444 g_topology_lock(); 445 error = g_access(cp, r, w, e); 446 g_topology_unlock(); 447 return (error); 448 } 449 450 /* 451 * XXX: Until we have unmessed the ioctl situation, there is a race against 452 * XXX: a concurrent orphanization. We cannot close it by holding topology 453 * XXX: since that would prevent us from doing our job, and stalling events 454 * XXX: will break (actually: stall) the BSD disklabel hacks. 455 */ 456 static int 457 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 458 { 459 struct g_consumer *cp; 460 struct g_provider *pp; 461 off_t offset, length, chunk, odd; 462 int i, error; 463 464 cp = dev->si_drv2; 465 pp = cp->provider; 466 467 error = 0; 468 KASSERT(cp->acr || cp->acw, 469 ("Consumer with zero access count in g_dev_ioctl")); 470 471 i = IOCPARM_LEN(cmd); 472 switch (cmd) { 473 case DIOCGSECTORSIZE: 474 *(u_int *)data = cp->provider->sectorsize; 475 if (*(u_int *)data == 0) 476 error = ENOENT; 477 break; 478 case DIOCGMEDIASIZE: 479 *(off_t *)data = cp->provider->mediasize; 480 if (*(off_t *)data == 0) 481 error = ENOENT; 482 break; 483 case DIOCGFWSECTORS: 484 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 485 if (error == 0 && *(u_int *)data == 0) 486 error = ENOENT; 487 break; 488 case DIOCGFWHEADS: 489 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 490 if (error == 0 && *(u_int *)data == 0) 491 error = ENOENT; 492 break; 493 case DIOCGFRONTSTUFF: 494 error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 495 break; 496 case DIOCSKERNELDUMP: 497 if (*(u_int *)data == 0) 498 error = g_dev_setdumpdev(NULL, td); 499 else 500 error = g_dev_setdumpdev(dev, td); 501 break; 502 case DIOCGFLUSH: 503 error = g_io_flush(cp); 504 break; 505 case DIOCGDELETE: 506 offset = ((off_t *)data)[0]; 507 length = ((off_t *)data)[1]; 508 if ((offset % cp->provider->sectorsize) != 0 || 509 (length % cp->provider->sectorsize) != 0 || length <= 0) { 510 printf("%s: offset=%jd length=%jd\n", __func__, offset, 511 length); 512 error = EINVAL; 513 break; 514 } 515 while (length > 0) { 516 chunk = length; 517 if (g_dev_del_max_sectors != 0 && chunk > 518 g_dev_del_max_sectors * cp->provider->sectorsize) { 519 chunk = g_dev_del_max_sectors * 520 cp->provider->sectorsize; 521 if (cp->provider->stripesize > 0) { 522 odd = (offset + chunk + 523 cp->provider->stripeoffset) % 524 cp->provider->stripesize; 525 if (chunk > odd) 526 chunk -= odd; 527 } 528 } 529 error = g_delete_data(cp, offset, chunk); 530 length -= chunk; 531 offset += chunk; 532 if (error) 533 break; 534 /* 535 * Since the request size can be large, the service 536 * time can be is likewise. We make this ioctl 537 * interruptible by checking for signals for each bio. 538 */ 539 if (SIGPENDING(td)) 540 break; 541 } 542 break; 543 case DIOCGIDENT: 544 error = g_io_getattr("GEOM::ident", cp, &i, data); 545 break; 546 case DIOCGPROVIDERNAME: 547 if (pp == NULL) 548 return (ENOENT); 549 strlcpy(data, pp->name, i); 550 break; 551 case DIOCGSTRIPESIZE: 552 *(off_t *)data = cp->provider->stripesize; 553 break; 554 case DIOCGSTRIPEOFFSET: 555 *(off_t *)data = cp->provider->stripeoffset; 556 break; 557 case DIOCGPHYSPATH: 558 error = g_io_getattr("GEOM::physpath", cp, &i, data); 559 if (error == 0 && *(char *)data == '\0') 560 error = ENOENT; 561 break; 562 case DIOCGATTR: { 563 struct diocgattr_arg *arg = (struct diocgattr_arg *)data; 564 565 if (arg->len > sizeof(arg->value)) { 566 error = EINVAL; 567 break; 568 } 569 error = g_io_getattr(arg->name, cp, &arg->len, &arg->value); 570 break; 571 } 572 case DIOCZONECMD: { 573 struct disk_zone_args *zone_args =(struct disk_zone_args *)data; 574 struct disk_zone_rep_entry *new_entries, *old_entries; 575 struct disk_zone_report *rep; 576 size_t alloc_size; 577 578 old_entries = NULL; 579 new_entries = NULL; 580 rep = NULL; 581 alloc_size = 0; 582 583 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES) { 584 585 rep = &zone_args->zone_params.report; 586 alloc_size = rep->entries_allocated * 587 sizeof(struct disk_zone_rep_entry); 588 if (alloc_size != 0) 589 new_entries = g_malloc(alloc_size, 590 M_WAITOK| M_ZERO); 591 old_entries = rep->entries; 592 rep->entries = new_entries; 593 } 594 error = g_io_zonecmd(zone_args, cp); 595 if ((zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES) 596 && (alloc_size != 0) 597 && (error == 0)) { 598 error = copyout(new_entries, old_entries, alloc_size); 599 } 600 if ((old_entries != NULL) 601 && (rep != NULL)) 602 rep->entries = old_entries; 603 604 if (new_entries != NULL) 605 g_free(new_entries); 606 break; 607 } 608 default: 609 if (cp->provider->geom->ioctl != NULL) { 610 error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td); 611 } else { 612 error = ENOIOCTL; 613 } 614 } 615 616 return (error); 617 } 618 619 static void 620 g_dev_done(struct bio *bp2) 621 { 622 struct g_consumer *cp; 623 struct g_dev_softc *sc; 624 struct bio *bp; 625 int destroy; 626 627 cp = bp2->bio_from; 628 sc = cp->private; 629 bp = bp2->bio_parent; 630 bp->bio_error = bp2->bio_error; 631 bp->bio_completed = bp2->bio_completed; 632 bp->bio_resid = bp->bio_length - bp2->bio_completed; 633 if (bp2->bio_cmd == BIO_ZONE) 634 bcopy(&bp2->bio_zone, &bp->bio_zone, sizeof(bp->bio_zone)); 635 636 if (bp2->bio_error != 0) { 637 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 638 bp2, bp2->bio_error); 639 bp->bio_flags |= BIO_ERROR; 640 } else { 641 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 642 bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed); 643 } 644 g_destroy_bio(bp2); 645 destroy = 0; 646 mtx_lock(&sc->sc_mtx); 647 if ((--sc->sc_active) == 0) { 648 if (sc->sc_open == 0) 649 wakeup(&sc->sc_active); 650 if (sc->sc_dev == NULL) 651 destroy = 1; 652 } 653 mtx_unlock(&sc->sc_mtx); 654 if (destroy) 655 g_post_event(g_dev_destroy, cp, M_NOWAIT, NULL); 656 biodone(bp); 657 } 658 659 static void 660 g_dev_strategy(struct bio *bp) 661 { 662 struct g_consumer *cp; 663 struct bio *bp2; 664 struct cdev *dev; 665 struct g_dev_softc *sc; 666 667 KASSERT(bp->bio_cmd == BIO_READ || 668 bp->bio_cmd == BIO_WRITE || 669 bp->bio_cmd == BIO_DELETE || 670 bp->bio_cmd == BIO_FLUSH || 671 bp->bio_cmd == BIO_ZONE, 672 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 673 dev = bp->bio_dev; 674 cp = dev->si_drv2; 675 sc = cp->private; 676 KASSERT(cp->acr || cp->acw, 677 ("Consumer with zero access count in g_dev_strategy")); 678 #ifdef INVARIANTS 679 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 680 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 681 bp->bio_resid = bp->bio_bcount; 682 biofinish(bp, NULL, EINVAL); 683 return; 684 } 685 #endif 686 mtx_lock(&sc->sc_mtx); 687 KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy")); 688 sc->sc_active++; 689 mtx_unlock(&sc->sc_mtx); 690 691 for (;;) { 692 /* 693 * XXX: This is not an ideal solution, but I believe it to 694 * XXX: deadlock safely, all things considered. 695 */ 696 bp2 = g_clone_bio(bp); 697 if (bp2 != NULL) 698 break; 699 pause("gdstrat", hz / 10); 700 } 701 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 702 bp2->bio_done = g_dev_done; 703 g_trace(G_T_BIO, 704 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 705 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 706 bp2->bio_data, bp2->bio_cmd); 707 g_io_request(bp2, cp); 708 KASSERT(cp->acr || cp->acw, 709 ("g_dev_strategy raced with g_dev_close and lost")); 710 711 } 712 713 /* 714 * g_dev_callback() 715 * 716 * Called by devfs when asynchronous device destruction is completed. 717 * - Mark that we have no attached device any more. 718 * - If there are no outstanding requests, schedule geom destruction. 719 * Otherwise destruction will be scheduled later by g_dev_done(). 720 */ 721 722 static void 723 g_dev_callback(void *arg) 724 { 725 struct g_consumer *cp; 726 struct g_dev_softc *sc; 727 int destroy; 728 729 cp = arg; 730 sc = cp->private; 731 g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name); 732 733 mtx_lock(&sc->sc_mtx); 734 sc->sc_dev = NULL; 735 sc->sc_alias = NULL; 736 destroy = (sc->sc_active == 0); 737 mtx_unlock(&sc->sc_mtx); 738 if (destroy) 739 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 740 } 741 742 /* 743 * g_dev_orphan() 744 * 745 * Called from below when the provider orphaned us. 746 * - Clear any dump settings. 747 * - Request asynchronous device destruction to prevent any more requests 748 * from coming in. The provider is already marked with an error, so 749 * anything which comes in the interim will be returned immediately. 750 */ 751 752 static void 753 g_dev_orphan(struct g_consumer *cp) 754 { 755 struct cdev *dev; 756 struct g_dev_softc *sc; 757 758 g_topology_assert(); 759 sc = cp->private; 760 dev = sc->sc_dev; 761 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name); 762 763 /* Reset any dump-area set on this device */ 764 if (dev->si_flags & SI_DUMPDEV) 765 (void)set_dumper(NULL, NULL, curthread); 766 767 /* Destroy the struct cdev *so we get no more requests */ 768 destroy_dev_sched_cb(dev, g_dev_callback, cp); 769 } 770 771 DECLARE_GEOM_CLASS(g_dev_class, g_dev);
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