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 "opt_compat.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/malloc.h> 44 #include <sys/kernel.h> 45 #include <sys/conf.h> 46 #include <sys/ctype.h> 47 #include <sys/bio.h> 48 #include <sys/bus.h> 49 #include <sys/lock.h> 50 #include <sys/mutex.h> 51 #include <sys/proc.h> 52 #include <sys/errno.h> 53 #include <sys/time.h> 54 #include <sys/disk.h> 55 #include <sys/fcntl.h> 56 #include <sys/limits.h> 57 #include <sys/sysctl.h> 58 #include <geom/geom.h> 59 #include <geom/geom_int.h> 60 #include <machine/stdarg.h> 61 62 struct g_dev_softc { 63 struct mtx sc_mtx; 64 struct cdev *sc_dev; 65 struct cdev *sc_alias; 66 int sc_open; 67 int sc_active; 68 }; 69 70 static d_open_t g_dev_open; 71 static d_close_t g_dev_close; 72 static d_strategy_t g_dev_strategy; 73 static d_ioctl_t g_dev_ioctl; 74 75 static struct cdevsw g_dev_cdevsw = { 76 .d_version = D_VERSION, 77 .d_open = g_dev_open, 78 .d_close = g_dev_close, 79 .d_read = physread, 80 .d_write = physwrite, 81 .d_ioctl = g_dev_ioctl, 82 .d_strategy = g_dev_strategy, 83 .d_name = "g_dev", 84 .d_flags = D_DISK | D_TRACKCLOSE, 85 }; 86 87 static g_init_t g_dev_init; 88 static g_fini_t g_dev_fini; 89 static g_taste_t g_dev_taste; 90 static g_orphan_t g_dev_orphan; 91 static g_attrchanged_t g_dev_attrchanged; 92 93 static struct g_class g_dev_class = { 94 .name = "DEV", 95 .version = G_VERSION, 96 .init = g_dev_init, 97 .fini = g_dev_fini, 98 .taste = g_dev_taste, 99 .orphan = g_dev_orphan, 100 .attrchanged = g_dev_attrchanged 101 }; 102 103 /* 104 * We target 262144 (8 x 32768) sectors by default as this significantly 105 * increases the throughput on commonly used SSD's with a marginal 106 * increase in non-interruptible request latency. 107 */ 108 static uint64_t g_dev_del_max_sectors = 262144; 109 SYSCTL_DECL(_kern_geom); 110 SYSCTL_NODE(_kern_geom, OID_AUTO, dev, CTLFLAG_RW, 0, "GEOM_DEV stuff"); 111 SYSCTL_QUAD(_kern_geom_dev, OID_AUTO, delete_max_sectors, CTLFLAG_RW, 112 &g_dev_del_max_sectors, 0, "Maximum number of sectors in a single " 113 "delete request sent to the provider. Larger requests are chunked " 114 "so they can be interrupted. (0 = disable chunking)"); 115 116 static char *dumpdev = NULL; 117 static void 118 g_dev_init(struct g_class *mp) 119 { 120 121 dumpdev = kern_getenv("dumpdev"); 122 } 123 124 static void 125 g_dev_fini(struct g_class *mp) 126 { 127 128 freeenv(dumpdev); 129 dumpdev = NULL; 130 } 131 132 static int 133 g_dev_setdumpdev(struct cdev *dev, struct diocskerneldump_arg *kda, 134 struct thread *td) 135 { 136 struct g_kerneldump kd; 137 struct g_consumer *cp; 138 int error, len; 139 140 if (dev == NULL || kda == NULL) 141 return (set_dumper(NULL, NULL, td, 0, NULL, 0, NULL)); 142 143 cp = dev->si_drv2; 144 len = sizeof(kd); 145 kd.offset = 0; 146 kd.length = OFF_MAX; 147 error = g_io_getattr("GEOM::kerneldump", cp, &len, &kd); 148 if (error != 0) 149 return (error); 150 151 error = set_dumper(&kd.di, devtoname(dev), td, kda->kda_encryption, 152 kda->kda_key, kda->kda_encryptedkeysize, kda->kda_encryptedkey); 153 if (error == 0) 154 dev->si_flags |= SI_DUMPDEV; 155 156 return (error); 157 } 158 159 static int 160 init_dumpdev(struct cdev *dev) 161 { 162 struct diocskerneldump_arg kda; 163 struct g_consumer *cp; 164 const char *devprefix = "/dev/", *devname; 165 int error; 166 size_t len; 167 168 bzero(&kda, sizeof(kda)); 169 kda.kda_enable = 1; 170 171 if (dumpdev == NULL) 172 return (0); 173 174 len = strlen(devprefix); 175 devname = devtoname(dev); 176 if (strcmp(devname, dumpdev) != 0 && 177 (strncmp(dumpdev, devprefix, len) != 0 || 178 strcmp(devname, dumpdev + len) != 0)) 179 return (0); 180 181 cp = (struct g_consumer *)dev->si_drv2; 182 error = g_access(cp, 1, 0, 0); 183 if (error != 0) 184 return (error); 185 186 error = g_dev_setdumpdev(dev, &kda, curthread); 187 if (error == 0) { 188 freeenv(dumpdev); 189 dumpdev = NULL; 190 } 191 192 (void)g_access(cp, -1, 0, 0); 193 194 return (error); 195 } 196 197 static void 198 g_dev_destroy(void *arg, int flags __unused) 199 { 200 struct g_consumer *cp; 201 struct g_geom *gp; 202 struct g_dev_softc *sc; 203 char buf[SPECNAMELEN + 6]; 204 205 g_topology_assert(); 206 cp = arg; 207 gp = cp->geom; 208 sc = cp->private; 209 g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name); 210 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 211 devctl_notify_f("GEOM", "DEV", "DESTROY", buf, M_WAITOK); 212 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 213 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 214 g_detach(cp); 215 g_destroy_consumer(cp); 216 g_destroy_geom(gp); 217 mtx_destroy(&sc->sc_mtx); 218 g_free(sc); 219 } 220 221 void 222 g_dev_print(void) 223 { 224 struct g_geom *gp; 225 char const *p = ""; 226 227 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 228 printf("%s%s", p, gp->name); 229 p = " "; 230 } 231 printf("\n"); 232 } 233 234 static void 235 g_dev_set_physpath(struct g_consumer *cp) 236 { 237 struct g_dev_softc *sc; 238 char *physpath; 239 int error, physpath_len; 240 241 if (g_access(cp, 1, 0, 0) != 0) 242 return; 243 244 sc = cp->private; 245 physpath_len = MAXPATHLEN; 246 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO); 247 error = g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath); 248 g_access(cp, -1, 0, 0); 249 if (error == 0 && strlen(physpath) != 0) { 250 struct cdev *dev, *old_alias_dev; 251 struct cdev **alias_devp; 252 253 dev = sc->sc_dev; 254 old_alias_dev = sc->sc_alias; 255 alias_devp = (struct cdev **)&sc->sc_alias; 256 make_dev_physpath_alias(MAKEDEV_WAITOK, alias_devp, dev, 257 old_alias_dev, physpath); 258 } else if (sc->sc_alias) { 259 destroy_dev((struct cdev *)sc->sc_alias); 260 sc->sc_alias = NULL; 261 } 262 g_free(physpath); 263 } 264 265 static void 266 g_dev_set_media(struct g_consumer *cp) 267 { 268 struct g_dev_softc *sc; 269 struct cdev *dev; 270 char buf[SPECNAMELEN + 6]; 271 272 sc = cp->private; 273 dev = sc->sc_dev; 274 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 275 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 276 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK); 277 dev = sc->sc_alias; 278 if (dev != NULL) { 279 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 280 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 281 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK); 282 } 283 } 284 285 static void 286 g_dev_attrchanged(struct g_consumer *cp, const char *attr) 287 { 288 289 if (strcmp(attr, "GEOM::media") == 0) { 290 g_dev_set_media(cp); 291 return; 292 } 293 294 if (strcmp(attr, "GEOM::physpath") == 0) { 295 g_dev_set_physpath(cp); 296 return; 297 } 298 } 299 300 struct g_provider * 301 g_dev_getprovider(struct cdev *dev) 302 { 303 struct g_consumer *cp; 304 305 g_topology_assert(); 306 if (dev == NULL) 307 return (NULL); 308 if (dev->si_devsw != &g_dev_cdevsw) 309 return (NULL); 310 cp = dev->si_drv2; 311 return (cp->provider); 312 } 313 314 static struct g_geom * 315 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 316 { 317 struct g_geom *gp; 318 struct g_consumer *cp; 319 struct g_dev_softc *sc; 320 int error; 321 struct cdev *dev; 322 char buf[SPECNAMELEN + 6]; 323 324 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 325 g_topology_assert(); 326 gp = g_new_geomf(mp, "%s", pp->name); 327 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 328 mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF); 329 cp = g_new_consumer(gp); 330 cp->private = sc; 331 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 332 error = g_attach(cp, pp); 333 KASSERT(error == 0, 334 ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 335 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &dev, 336 &g_dev_cdevsw, NULL, UID_ROOT, GID_OPERATOR, 0640, "%s", gp->name); 337 if (error != 0) { 338 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n", 339 __func__, gp->name, error); 340 g_detach(cp); 341 g_destroy_consumer(cp); 342 g_destroy_geom(gp); 343 mtx_destroy(&sc->sc_mtx); 344 g_free(sc); 345 return (NULL); 346 } 347 dev->si_flags |= SI_UNMAPPED; 348 sc->sc_dev = dev; 349 350 dev->si_iosize_max = MAXPHYS; 351 dev->si_drv2 = cp; 352 error = init_dumpdev(dev); 353 if (error != 0) 354 printf("%s: init_dumpdev() failed (gp->name=%s, error=%d)\n", 355 __func__, gp->name, error); 356 357 g_dev_attrchanged(cp, "GEOM::physpath"); 358 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 359 devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK); 360 361 return (gp); 362 } 363 364 static int 365 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 366 { 367 struct g_consumer *cp; 368 struct g_dev_softc *sc; 369 int error, r, w, e; 370 371 cp = dev->si_drv2; 372 if (cp == NULL) 373 return (ENXIO); /* g_dev_taste() not done yet */ 374 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 375 cp->geom->name, flags, fmt, td); 376 377 r = flags & FREAD ? 1 : 0; 378 w = flags & FWRITE ? 1 : 0; 379 #ifdef notyet 380 e = flags & O_EXCL ? 1 : 0; 381 #else 382 e = 0; 383 #endif 384 385 /* 386 * This happens on attempt to open a device node with O_EXEC. 387 */ 388 if (r + w + e == 0) 389 return (EINVAL); 390 391 if (w) { 392 /* 393 * When running in very secure mode, do not allow 394 * opens for writing of any disks. 395 */ 396 error = securelevel_ge(td->td_ucred, 2); 397 if (error) 398 return (error); 399 } 400 g_topology_lock(); 401 error = g_access(cp, r, w, e); 402 g_topology_unlock(); 403 if (error == 0) { 404 sc = cp->private; 405 mtx_lock(&sc->sc_mtx); 406 if (sc->sc_open == 0 && sc->sc_active != 0) 407 wakeup(&sc->sc_active); 408 sc->sc_open += r + w + e; 409 mtx_unlock(&sc->sc_mtx); 410 } 411 return (error); 412 } 413 414 static int 415 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 416 { 417 struct g_consumer *cp; 418 struct g_dev_softc *sc; 419 int error, r, w, e; 420 421 cp = dev->si_drv2; 422 if (cp == NULL) 423 return (ENXIO); 424 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 425 cp->geom->name, flags, fmt, td); 426 427 r = flags & FREAD ? -1 : 0; 428 w = flags & FWRITE ? -1 : 0; 429 #ifdef notyet 430 e = flags & O_EXCL ? -1 : 0; 431 #else 432 e = 0; 433 #endif 434 435 /* 436 * The vgonel(9) - caused by eg. forced unmount of devfs - calls 437 * VOP_CLOSE(9) on devfs vnode without any FREAD or FWRITE flags, 438 * which would result in zero deltas, which in turn would cause 439 * panic in g_access(9). 440 * 441 * Note that we cannot zero the counters (ie. do "r = cp->acr" 442 * etc) instead, because the consumer might be opened in another 443 * devfs instance. 444 */ 445 if (r + w + e == 0) 446 return (EINVAL); 447 448 sc = cp->private; 449 mtx_lock(&sc->sc_mtx); 450 sc->sc_open += r + w + e; 451 while (sc->sc_open == 0 && sc->sc_active != 0) 452 msleep(&sc->sc_active, &sc->sc_mtx, 0, "PRIBIO", 0); 453 mtx_unlock(&sc->sc_mtx); 454 g_topology_lock(); 455 error = g_access(cp, r, w, e); 456 g_topology_unlock(); 457 return (error); 458 } 459 460 /* 461 * XXX: Until we have unmessed the ioctl situation, there is a race against 462 * XXX: a concurrent orphanization. We cannot close it by holding topology 463 * XXX: since that would prevent us from doing our job, and stalling events 464 * XXX: will break (actually: stall) the BSD disklabel hacks. 465 */ 466 static int 467 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 468 { 469 struct g_consumer *cp; 470 struct g_provider *pp; 471 off_t offset, length, chunk; 472 int i, error; 473 474 cp = dev->si_drv2; 475 pp = cp->provider; 476 477 error = 0; 478 KASSERT(cp->acr || cp->acw, 479 ("Consumer with zero access count in g_dev_ioctl")); 480 481 i = IOCPARM_LEN(cmd); 482 switch (cmd) { 483 case DIOCGSECTORSIZE: 484 *(u_int *)data = cp->provider->sectorsize; 485 if (*(u_int *)data == 0) 486 error = ENOENT; 487 break; 488 case DIOCGMEDIASIZE: 489 *(off_t *)data = cp->provider->mediasize; 490 if (*(off_t *)data == 0) 491 error = ENOENT; 492 break; 493 case DIOCGFWSECTORS: 494 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 495 if (error == 0 && *(u_int *)data == 0) 496 error = ENOENT; 497 break; 498 case DIOCGFWHEADS: 499 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 500 if (error == 0 && *(u_int *)data == 0) 501 error = ENOENT; 502 break; 503 case DIOCGFRONTSTUFF: 504 error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 505 break; 506 #ifdef COMPAT_FREEBSD11 507 case DIOCSKERNELDUMP_FREEBSD11: 508 { 509 struct diocskerneldump_arg kda; 510 511 bzero(&kda, sizeof(kda)); 512 kda.kda_encryption = KERNELDUMP_ENC_NONE; 513 kda.kda_enable = (uint8_t)*(u_int *)data; 514 if (kda.kda_enable == 0) 515 error = g_dev_setdumpdev(NULL, NULL, td); 516 else 517 error = g_dev_setdumpdev(dev, &kda, td); 518 break; 519 } 520 #endif 521 case DIOCSKERNELDUMP: 522 { 523 struct diocskerneldump_arg *kda; 524 uint8_t *encryptedkey; 525 526 kda = (struct diocskerneldump_arg *)data; 527 if (kda->kda_enable == 0) { 528 error = g_dev_setdumpdev(NULL, NULL, td); 529 break; 530 } 531 532 if (kda->kda_encryption != KERNELDUMP_ENC_NONE) { 533 if (kda->kda_encryptedkeysize <= 0 || 534 kda->kda_encryptedkeysize > 535 KERNELDUMP_ENCKEY_MAX_SIZE) { 536 return (EINVAL); 537 } 538 encryptedkey = malloc(kda->kda_encryptedkeysize, M_TEMP, 539 M_WAITOK); 540 error = copyin(kda->kda_encryptedkey, encryptedkey, 541 kda->kda_encryptedkeysize); 542 } else { 543 encryptedkey = NULL; 544 } 545 if (error == 0) { 546 kda->kda_encryptedkey = encryptedkey; 547 error = g_dev_setdumpdev(dev, kda, td); 548 } 549 if (encryptedkey != NULL) { 550 explicit_bzero(encryptedkey, kda->kda_encryptedkeysize); 551 free(encryptedkey, M_TEMP); 552 } 553 explicit_bzero(kda, sizeof(*kda)); 554 break; 555 } 556 case DIOCGFLUSH: 557 error = g_io_flush(cp); 558 break; 559 case DIOCGDELETE: 560 offset = ((off_t *)data)[0]; 561 length = ((off_t *)data)[1]; 562 if ((offset % cp->provider->sectorsize) != 0 || 563 (length % cp->provider->sectorsize) != 0 || length <= 0) { 564 printf("%s: offset=%jd length=%jd\n", __func__, offset, 565 length); 566 error = EINVAL; 567 break; 568 } 569 while (length > 0) { 570 chunk = length; 571 if (g_dev_del_max_sectors != 0 && chunk > 572 g_dev_del_max_sectors * cp->provider->sectorsize) { 573 chunk = g_dev_del_max_sectors * 574 cp->provider->sectorsize; 575 } 576 error = g_delete_data(cp, offset, chunk); 577 length -= chunk; 578 offset += chunk; 579 if (error) 580 break; 581 /* 582 * Since the request size can be large, the service 583 * time can be is likewise. We make this ioctl 584 * interruptible by checking for signals for each bio. 585 */ 586 if (SIGPENDING(td)) 587 break; 588 } 589 break; 590 case DIOCGIDENT: 591 error = g_io_getattr("GEOM::ident", cp, &i, data); 592 break; 593 case DIOCGPROVIDERNAME: 594 if (pp == NULL) 595 return (ENOENT); 596 strlcpy(data, pp->name, i); 597 break; 598 case DIOCGSTRIPESIZE: 599 *(off_t *)data = cp->provider->stripesize; 600 break; 601 case DIOCGSTRIPEOFFSET: 602 *(off_t *)data = cp->provider->stripeoffset; 603 break; 604 case DIOCGPHYSPATH: 605 error = g_io_getattr("GEOM::physpath", cp, &i, data); 606 if (error == 0 && *(char *)data == '\0') 607 error = ENOENT; 608 break; 609 case DIOCGATTR: { 610 struct diocgattr_arg *arg = (struct diocgattr_arg *)data; 611 612 if (arg->len > sizeof(arg->value)) { 613 error = EINVAL; 614 break; 615 } 616 error = g_io_getattr(arg->name, cp, &arg->len, &arg->value); 617 break; 618 } 619 case DIOCZONECMD: { 620 struct disk_zone_args *zone_args =(struct disk_zone_args *)data; 621 struct disk_zone_rep_entry *new_entries, *old_entries; 622 struct disk_zone_report *rep; 623 size_t alloc_size; 624 625 old_entries = NULL; 626 new_entries = NULL; 627 rep = NULL; 628 alloc_size = 0; 629 630 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES) { 631 632 rep = &zone_args->zone_params.report; 633 alloc_size = rep->entries_allocated * 634 sizeof(struct disk_zone_rep_entry); 635 if (alloc_size != 0) 636 new_entries = g_malloc(alloc_size, 637 M_WAITOK| M_ZERO); 638 old_entries = rep->entries; 639 rep->entries = new_entries; 640 } 641 error = g_io_zonecmd(zone_args, cp); 642 if ((zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES) 643 && (alloc_size != 0) 644 && (error == 0)) { 645 error = copyout(new_entries, old_entries, alloc_size); 646 } 647 if ((old_entries != NULL) 648 && (rep != NULL)) 649 rep->entries = old_entries; 650 651 if (new_entries != NULL) 652 g_free(new_entries); 653 break; 654 } 655 default: 656 if (cp->provider->geom->ioctl != NULL) { 657 error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td); 658 } else { 659 error = ENOIOCTL; 660 } 661 } 662 663 return (error); 664 } 665 666 static void 667 g_dev_done(struct bio *bp2) 668 { 669 struct g_consumer *cp; 670 struct g_dev_softc *sc; 671 struct bio *bp; 672 int destroy; 673 674 cp = bp2->bio_from; 675 sc = cp->private; 676 bp = bp2->bio_parent; 677 bp->bio_error = bp2->bio_error; 678 bp->bio_completed = bp2->bio_completed; 679 bp->bio_resid = bp->bio_length - bp2->bio_completed; 680 if (bp2->bio_cmd == BIO_ZONE) 681 bcopy(&bp2->bio_zone, &bp->bio_zone, sizeof(bp->bio_zone)); 682 683 if (bp2->bio_error != 0) { 684 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 685 bp2, bp2->bio_error); 686 bp->bio_flags |= BIO_ERROR; 687 } else { 688 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 689 bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed); 690 } 691 g_destroy_bio(bp2); 692 destroy = 0; 693 mtx_lock(&sc->sc_mtx); 694 if ((--sc->sc_active) == 0) { 695 if (sc->sc_open == 0) 696 wakeup(&sc->sc_active); 697 if (sc->sc_dev == NULL) 698 destroy = 1; 699 } 700 mtx_unlock(&sc->sc_mtx); 701 if (destroy) 702 g_post_event(g_dev_destroy, cp, M_NOWAIT, NULL); 703 biodone(bp); 704 } 705 706 static void 707 g_dev_strategy(struct bio *bp) 708 { 709 struct g_consumer *cp; 710 struct bio *bp2; 711 struct cdev *dev; 712 struct g_dev_softc *sc; 713 714 KASSERT(bp->bio_cmd == BIO_READ || 715 bp->bio_cmd == BIO_WRITE || 716 bp->bio_cmd == BIO_DELETE || 717 bp->bio_cmd == BIO_FLUSH || 718 bp->bio_cmd == BIO_ZONE, 719 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 720 dev = bp->bio_dev; 721 cp = dev->si_drv2; 722 sc = cp->private; 723 KASSERT(cp->acr || cp->acw, 724 ("Consumer with zero access count in g_dev_strategy")); 725 biotrack(bp, __func__); 726 #ifdef INVARIANTS 727 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 728 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 729 bp->bio_resid = bp->bio_bcount; 730 biofinish(bp, NULL, EINVAL); 731 return; 732 } 733 #endif 734 mtx_lock(&sc->sc_mtx); 735 KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy")); 736 sc->sc_active++; 737 mtx_unlock(&sc->sc_mtx); 738 739 for (;;) { 740 /* 741 * XXX: This is not an ideal solution, but I believe it to 742 * XXX: deadlock safely, all things considered. 743 */ 744 bp2 = g_clone_bio(bp); 745 if (bp2 != NULL) 746 break; 747 pause("gdstrat", hz / 10); 748 } 749 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 750 bp2->bio_done = g_dev_done; 751 g_trace(G_T_BIO, 752 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 753 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 754 bp2->bio_data, bp2->bio_cmd); 755 g_io_request(bp2, cp); 756 KASSERT(cp->acr || cp->acw, 757 ("g_dev_strategy raced with g_dev_close and lost")); 758 759 } 760 761 /* 762 * g_dev_callback() 763 * 764 * Called by devfs when asynchronous device destruction is completed. 765 * - Mark that we have no attached device any more. 766 * - If there are no outstanding requests, schedule geom destruction. 767 * Otherwise destruction will be scheduled later by g_dev_done(). 768 */ 769 770 static void 771 g_dev_callback(void *arg) 772 { 773 struct g_consumer *cp; 774 struct g_dev_softc *sc; 775 int destroy; 776 777 cp = arg; 778 sc = cp->private; 779 g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name); 780 781 mtx_lock(&sc->sc_mtx); 782 sc->sc_dev = NULL; 783 sc->sc_alias = NULL; 784 destroy = (sc->sc_active == 0); 785 mtx_unlock(&sc->sc_mtx); 786 if (destroy) 787 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 788 } 789 790 /* 791 * g_dev_orphan() 792 * 793 * Called from below when the provider orphaned us. 794 * - Clear any dump settings. 795 * - Request asynchronous device destruction to prevent any more requests 796 * from coming in. The provider is already marked with an error, so 797 * anything which comes in the interim will be returned immediately. 798 */ 799 800 static void 801 g_dev_orphan(struct g_consumer *cp) 802 { 803 struct cdev *dev; 804 struct g_dev_softc *sc; 805 806 g_topology_assert(); 807 sc = cp->private; 808 dev = sc->sc_dev; 809 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name); 810 811 /* Reset any dump-area set on this device */ 812 if (dev->si_flags & SI_DUMPDEV) 813 (void)set_dumper(NULL, NULL, curthread, 0, NULL, 0, NULL); 814 815 /* Destroy the struct cdev *so we get no more requests */ 816 destroy_dev_sched_cb(dev, g_dev_callback, cp); 817 } 818 819 DECLARE_GEOM_CLASS(g_dev_class, g_dev); 820