Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/geom/geom_dev.c
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1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2002 Poul-Henning Kamp 5 * Copyright (c) 2002 Networks Associates Technology, Inc. 6 * All rights reserved. 7 * 8 * This software was developed for the FreeBSD Project by Poul-Henning Kamp 9 * and NAI Labs, the Security Research Division of Network Associates, Inc. 10 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 11 * DARPA CHATS research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. The names of the authors may not be used to endorse or promote 22 * products derived from this software without specific prior written 23 * permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD: releng/12.0/sys/geom/geom_dev.c 333282 2018-05-06 00:22:38Z markj $"); 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 (clear_dumper(td)); 142 143 cp = dev->si_drv2; 144 len = sizeof(kd); 145 memset(&kd, 0, len); 146 kd.offset = 0; 147 kd.length = OFF_MAX; 148 error = g_io_getattr("GEOM::kerneldump", cp, &len, &kd); 149 if (error != 0) 150 return (error); 151 152 error = set_dumper(&kd.di, devtoname(dev), td, kda->kda_compression, 153 kda->kda_encryption, kda->kda_key, kda->kda_encryptedkeysize, 154 kda->kda_encryptedkey); 155 if (error == 0) 156 dev->si_flags |= SI_DUMPDEV; 157 158 return (error); 159 } 160 161 static int 162 init_dumpdev(struct cdev *dev) 163 { 164 struct diocskerneldump_arg kda; 165 struct g_consumer *cp; 166 const char *devprefix = "/dev/", *devname; 167 int error; 168 size_t len; 169 170 bzero(&kda, sizeof(kda)); 171 kda.kda_enable = 1; 172 173 if (dumpdev == NULL) 174 return (0); 175 176 len = strlen(devprefix); 177 devname = devtoname(dev); 178 if (strcmp(devname, dumpdev) != 0 && 179 (strncmp(dumpdev, devprefix, len) != 0 || 180 strcmp(devname, dumpdev + len) != 0)) 181 return (0); 182 183 cp = (struct g_consumer *)dev->si_drv2; 184 error = g_access(cp, 1, 0, 0); 185 if (error != 0) 186 return (error); 187 188 error = g_dev_setdumpdev(dev, &kda, curthread); 189 if (error == 0) { 190 freeenv(dumpdev); 191 dumpdev = NULL; 192 } 193 194 (void)g_access(cp, -1, 0, 0); 195 196 return (error); 197 } 198 199 static void 200 g_dev_destroy(void *arg, int flags __unused) 201 { 202 struct g_consumer *cp; 203 struct g_geom *gp; 204 struct g_dev_softc *sc; 205 char buf[SPECNAMELEN + 6]; 206 207 g_topology_assert(); 208 cp = arg; 209 gp = cp->geom; 210 sc = cp->private; 211 g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name); 212 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 213 devctl_notify_f("GEOM", "DEV", "DESTROY", buf, M_WAITOK); 214 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 215 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 216 g_detach(cp); 217 g_destroy_consumer(cp); 218 g_destroy_geom(gp); 219 mtx_destroy(&sc->sc_mtx); 220 g_free(sc); 221 } 222 223 void 224 g_dev_print(void) 225 { 226 struct g_geom *gp; 227 char const *p = ""; 228 229 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 230 printf("%s%s", p, gp->name); 231 p = " "; 232 } 233 printf("\n"); 234 } 235 236 static void 237 g_dev_set_physpath(struct g_consumer *cp) 238 { 239 struct g_dev_softc *sc; 240 char *physpath; 241 int error, physpath_len; 242 243 if (g_access(cp, 1, 0, 0) != 0) 244 return; 245 246 sc = cp->private; 247 physpath_len = MAXPATHLEN; 248 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO); 249 error = g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath); 250 g_access(cp, -1, 0, 0); 251 if (error == 0 && strlen(physpath) != 0) { 252 struct cdev *dev, *old_alias_dev; 253 struct cdev **alias_devp; 254 255 dev = sc->sc_dev; 256 old_alias_dev = sc->sc_alias; 257 alias_devp = (struct cdev **)&sc->sc_alias; 258 make_dev_physpath_alias(MAKEDEV_WAITOK, alias_devp, dev, 259 old_alias_dev, physpath); 260 } else if (sc->sc_alias) { 261 destroy_dev((struct cdev *)sc->sc_alias); 262 sc->sc_alias = NULL; 263 } 264 g_free(physpath); 265 } 266 267 static void 268 g_dev_set_media(struct g_consumer *cp) 269 { 270 struct g_dev_softc *sc; 271 struct cdev *dev; 272 char buf[SPECNAMELEN + 6]; 273 274 sc = cp->private; 275 dev = sc->sc_dev; 276 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 277 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 278 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK); 279 dev = sc->sc_alias; 280 if (dev != NULL) { 281 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 282 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 283 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK); 284 } 285 } 286 287 static void 288 g_dev_attrchanged(struct g_consumer *cp, const char *attr) 289 { 290 291 if (strcmp(attr, "GEOM::media") == 0) { 292 g_dev_set_media(cp); 293 return; 294 } 295 296 if (strcmp(attr, "GEOM::physpath") == 0) { 297 g_dev_set_physpath(cp); 298 return; 299 } 300 } 301 302 struct g_provider * 303 g_dev_getprovider(struct cdev *dev) 304 { 305 struct g_consumer *cp; 306 307 g_topology_assert(); 308 if (dev == NULL) 309 return (NULL); 310 if (dev->si_devsw != &g_dev_cdevsw) 311 return (NULL); 312 cp = dev->si_drv2; 313 return (cp->provider); 314 } 315 316 static struct g_geom * 317 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 318 { 319 struct g_geom *gp; 320 struct g_geom_alias *gap; 321 struct g_consumer *cp; 322 struct g_dev_softc *sc; 323 int error; 324 struct cdev *dev, *adev; 325 char buf[SPECNAMELEN + 6]; 326 327 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 328 g_topology_assert(); 329 gp = g_new_geomf(mp, "%s", pp->name); 330 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 331 mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF); 332 cp = g_new_consumer(gp); 333 cp->private = sc; 334 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 335 error = g_attach(cp, pp); 336 KASSERT(error == 0, 337 ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 338 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &dev, 339 &g_dev_cdevsw, NULL, UID_ROOT, GID_OPERATOR, 0640, "%s", gp->name); 340 if (error != 0) { 341 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n", 342 __func__, gp->name, error); 343 g_detach(cp); 344 g_destroy_consumer(cp); 345 g_destroy_geom(gp); 346 mtx_destroy(&sc->sc_mtx); 347 g_free(sc); 348 return (NULL); 349 } 350 dev->si_flags |= SI_UNMAPPED; 351 sc->sc_dev = dev; 352 353 dev->si_iosize_max = MAXPHYS; 354 dev->si_drv2 = cp; 355 error = init_dumpdev(dev); 356 if (error != 0) 357 printf("%s: init_dumpdev() failed (gp->name=%s, error=%d)\n", 358 __func__, gp->name, error); 359 360 g_dev_attrchanged(cp, "GEOM::physpath"); 361 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 362 devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK); 363 /* 364 * Now add all the aliases for this drive 365 */ 366 LIST_FOREACH(gap, &pp->geom->aliases, ga_next) { 367 error = make_dev_alias_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &adev, dev, 368 "%s", gap->ga_alias); 369 if (error) { 370 printf("%s: make_dev_alias_p() failed (name=%s, error=%d)\n", 371 __func__, gap->ga_alias, error); 372 continue; 373 } 374 snprintf(buf, sizeof(buf), "cdev=%s", gap->ga_alias); 375 devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK); 376 } 377 378 return (gp); 379 } 380 381 static int 382 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 383 { 384 struct g_consumer *cp; 385 struct g_dev_softc *sc; 386 int error, r, w, e; 387 388 cp = dev->si_drv2; 389 if (cp == NULL) 390 return (ENXIO); /* g_dev_taste() not done yet */ 391 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 392 cp->geom->name, flags, fmt, td); 393 394 r = flags & FREAD ? 1 : 0; 395 w = flags & FWRITE ? 1 : 0; 396 #ifdef notyet 397 e = flags & O_EXCL ? 1 : 0; 398 #else 399 e = 0; 400 #endif 401 402 /* 403 * This happens on attempt to open a device node with O_EXEC. 404 */ 405 if (r + w + e == 0) 406 return (EINVAL); 407 408 if (w) { 409 /* 410 * When running in very secure mode, do not allow 411 * opens for writing of any disks. 412 */ 413 error = securelevel_ge(td->td_ucred, 2); 414 if (error) 415 return (error); 416 } 417 g_topology_lock(); 418 error = g_access(cp, r, w, e); 419 g_topology_unlock(); 420 if (error == 0) { 421 sc = cp->private; 422 mtx_lock(&sc->sc_mtx); 423 if (sc->sc_open == 0 && sc->sc_active != 0) 424 wakeup(&sc->sc_active); 425 sc->sc_open += r + w + e; 426 mtx_unlock(&sc->sc_mtx); 427 } 428 return (error); 429 } 430 431 static int 432 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 433 { 434 struct g_consumer *cp; 435 struct g_dev_softc *sc; 436 int error, r, w, e; 437 438 cp = dev->si_drv2; 439 if (cp == NULL) 440 return (ENXIO); 441 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 442 cp->geom->name, flags, fmt, td); 443 444 r = flags & FREAD ? -1 : 0; 445 w = flags & FWRITE ? -1 : 0; 446 #ifdef notyet 447 e = flags & O_EXCL ? -1 : 0; 448 #else 449 e = 0; 450 #endif 451 452 /* 453 * The vgonel(9) - caused by eg. forced unmount of devfs - calls 454 * VOP_CLOSE(9) on devfs vnode without any FREAD or FWRITE flags, 455 * which would result in zero deltas, which in turn would cause 456 * panic in g_access(9). 457 * 458 * Note that we cannot zero the counters (ie. do "r = cp->acr" 459 * etc) instead, because the consumer might be opened in another 460 * devfs instance. 461 */ 462 if (r + w + e == 0) 463 return (EINVAL); 464 465 sc = cp->private; 466 mtx_lock(&sc->sc_mtx); 467 sc->sc_open += r + w + e; 468 while (sc->sc_open == 0 && sc->sc_active != 0) 469 msleep(&sc->sc_active, &sc->sc_mtx, 0, "PRIBIO", 0); 470 mtx_unlock(&sc->sc_mtx); 471 g_topology_lock(); 472 error = g_access(cp, r, w, e); 473 g_topology_unlock(); 474 return (error); 475 } 476 477 /* 478 * XXX: Until we have unmessed the ioctl situation, there is a race against 479 * XXX: a concurrent orphanization. We cannot close it by holding topology 480 * XXX: since that would prevent us from doing our job, and stalling events 481 * XXX: will break (actually: stall) the BSD disklabel hacks. 482 */ 483 static int 484 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 485 { 486 struct g_consumer *cp; 487 struct g_provider *pp; 488 off_t offset, length, chunk, odd; 489 int i, error; 490 491 cp = dev->si_drv2; 492 pp = cp->provider; 493 494 error = 0; 495 KASSERT(cp->acr || cp->acw, 496 ("Consumer with zero access count in g_dev_ioctl")); 497 498 i = IOCPARM_LEN(cmd); 499 switch (cmd) { 500 case DIOCGSECTORSIZE: 501 *(u_int *)data = cp->provider->sectorsize; 502 if (*(u_int *)data == 0) 503 error = ENOENT; 504 break; 505 case DIOCGMEDIASIZE: 506 *(off_t *)data = cp->provider->mediasize; 507 if (*(off_t *)data == 0) 508 error = ENOENT; 509 break; 510 case DIOCGFWSECTORS: 511 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 512 if (error == 0 && *(u_int *)data == 0) 513 error = ENOENT; 514 break; 515 case DIOCGFWHEADS: 516 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 517 if (error == 0 && *(u_int *)data == 0) 518 error = ENOENT; 519 break; 520 case DIOCGFRONTSTUFF: 521 error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 522 break; 523 #ifdef COMPAT_FREEBSD11 524 case DIOCSKERNELDUMP_FREEBSD11: 525 { 526 struct diocskerneldump_arg kda; 527 528 bzero(&kda, sizeof(kda)); 529 kda.kda_encryption = KERNELDUMP_ENC_NONE; 530 kda.kda_enable = (uint8_t)*(u_int *)data; 531 if (kda.kda_enable == 0) 532 error = g_dev_setdumpdev(NULL, NULL, td); 533 else 534 error = g_dev_setdumpdev(dev, &kda, td); 535 break; 536 } 537 #endif 538 case DIOCSKERNELDUMP: 539 { 540 struct diocskerneldump_arg *kda; 541 uint8_t *encryptedkey; 542 543 kda = (struct diocskerneldump_arg *)data; 544 if (kda->kda_enable == 0) { 545 error = g_dev_setdumpdev(NULL, NULL, td); 546 break; 547 } 548 549 if (kda->kda_encryption != KERNELDUMP_ENC_NONE) { 550 if (kda->kda_encryptedkeysize <= 0 || 551 kda->kda_encryptedkeysize > 552 KERNELDUMP_ENCKEY_MAX_SIZE) { 553 return (EINVAL); 554 } 555 encryptedkey = malloc(kda->kda_encryptedkeysize, M_TEMP, 556 M_WAITOK); 557 error = copyin(kda->kda_encryptedkey, encryptedkey, 558 kda->kda_encryptedkeysize); 559 } else { 560 encryptedkey = NULL; 561 } 562 if (error == 0) { 563 kda->kda_encryptedkey = encryptedkey; 564 error = g_dev_setdumpdev(dev, kda, td); 565 } 566 if (encryptedkey != NULL) { 567 explicit_bzero(encryptedkey, kda->kda_encryptedkeysize); 568 free(encryptedkey, M_TEMP); 569 } 570 explicit_bzero(kda, sizeof(*kda)); 571 break; 572 } 573 case DIOCGFLUSH: 574 error = g_io_flush(cp); 575 break; 576 case DIOCGDELETE: 577 offset = ((off_t *)data)[0]; 578 length = ((off_t *)data)[1]; 579 if ((offset % cp->provider->sectorsize) != 0 || 580 (length % cp->provider->sectorsize) != 0 || length <= 0) { 581 printf("%s: offset=%jd length=%jd\n", __func__, offset, 582 length); 583 error = EINVAL; 584 break; 585 } 586 while (length > 0) { 587 chunk = length; 588 if (g_dev_del_max_sectors != 0 && chunk > 589 g_dev_del_max_sectors * cp->provider->sectorsize) { 590 chunk = g_dev_del_max_sectors * 591 cp->provider->sectorsize; 592 if (cp->provider->stripesize > 0) { 593 odd = (offset + chunk + 594 cp->provider->stripeoffset) % 595 cp->provider->stripesize; 596 if (chunk > odd) 597 chunk -= odd; 598 } 599 } 600 error = g_delete_data(cp, offset, chunk); 601 length -= chunk; 602 offset += chunk; 603 if (error) 604 break; 605 /* 606 * Since the request size can be large, the service 607 * time can be is likewise. We make this ioctl 608 * interruptible by checking for signals for each bio. 609 */ 610 if (SIGPENDING(td)) 611 break; 612 } 613 break; 614 case DIOCGIDENT: 615 error = g_io_getattr("GEOM::ident", cp, &i, data); 616 break; 617 case DIOCGPROVIDERNAME: 618 if (pp == NULL) 619 return (ENOENT); 620 strlcpy(data, pp->name, i); 621 break; 622 case DIOCGSTRIPESIZE: 623 *(off_t *)data = cp->provider->stripesize; 624 break; 625 case DIOCGSTRIPEOFFSET: 626 *(off_t *)data = cp->provider->stripeoffset; 627 break; 628 case DIOCGPHYSPATH: 629 error = g_io_getattr("GEOM::physpath", cp, &i, data); 630 if (error == 0 && *(char *)data == '\0') 631 error = ENOENT; 632 break; 633 case DIOCGATTR: { 634 struct diocgattr_arg *arg = (struct diocgattr_arg *)data; 635 636 if (arg->len > sizeof(arg->value)) { 637 error = EINVAL; 638 break; 639 } 640 error = g_io_getattr(arg->name, cp, &arg->len, &arg->value); 641 break; 642 } 643 case DIOCZONECMD: { 644 struct disk_zone_args *zone_args =(struct disk_zone_args *)data; 645 struct disk_zone_rep_entry *new_entries, *old_entries; 646 struct disk_zone_report *rep; 647 size_t alloc_size; 648 649 old_entries = NULL; 650 new_entries = NULL; 651 rep = NULL; 652 alloc_size = 0; 653 654 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES) { 655 656 rep = &zone_args->zone_params.report; 657 alloc_size = rep->entries_allocated * 658 sizeof(struct disk_zone_rep_entry); 659 if (alloc_size != 0) 660 new_entries = g_malloc(alloc_size, 661 M_WAITOK| M_ZERO); 662 old_entries = rep->entries; 663 rep->entries = new_entries; 664 } 665 error = g_io_zonecmd(zone_args, cp); 666 if ((zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES) 667 && (alloc_size != 0) 668 && (error == 0)) { 669 error = copyout(new_entries, old_entries, alloc_size); 670 } 671 if ((old_entries != NULL) 672 && (rep != NULL)) 673 rep->entries = old_entries; 674 675 if (new_entries != NULL) 676 g_free(new_entries); 677 break; 678 } 679 default: 680 if (cp->provider->geom->ioctl != NULL) { 681 error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td); 682 } else { 683 error = ENOIOCTL; 684 } 685 } 686 687 return (error); 688 } 689 690 static void 691 g_dev_done(struct bio *bp2) 692 { 693 struct g_consumer *cp; 694 struct g_dev_softc *sc; 695 struct bio *bp; 696 int destroy; 697 698 cp = bp2->bio_from; 699 sc = cp->private; 700 bp = bp2->bio_parent; 701 bp->bio_error = bp2->bio_error; 702 bp->bio_completed = bp2->bio_completed; 703 bp->bio_resid = bp->bio_length - bp2->bio_completed; 704 if (bp2->bio_cmd == BIO_ZONE) 705 bcopy(&bp2->bio_zone, &bp->bio_zone, sizeof(bp->bio_zone)); 706 707 if (bp2->bio_error != 0) { 708 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 709 bp2, bp2->bio_error); 710 bp->bio_flags |= BIO_ERROR; 711 } else { 712 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 713 bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed); 714 } 715 g_destroy_bio(bp2); 716 destroy = 0; 717 mtx_lock(&sc->sc_mtx); 718 if ((--sc->sc_active) == 0) { 719 if (sc->sc_open == 0) 720 wakeup(&sc->sc_active); 721 if (sc->sc_dev == NULL) 722 destroy = 1; 723 } 724 mtx_unlock(&sc->sc_mtx); 725 if (destroy) 726 g_post_event(g_dev_destroy, cp, M_NOWAIT, NULL); 727 biodone(bp); 728 } 729 730 static void 731 g_dev_strategy(struct bio *bp) 732 { 733 struct g_consumer *cp; 734 struct bio *bp2; 735 struct cdev *dev; 736 struct g_dev_softc *sc; 737 738 KASSERT(bp->bio_cmd == BIO_READ || 739 bp->bio_cmd == BIO_WRITE || 740 bp->bio_cmd == BIO_DELETE || 741 bp->bio_cmd == BIO_FLUSH || 742 bp->bio_cmd == BIO_ZONE, 743 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 744 dev = bp->bio_dev; 745 cp = dev->si_drv2; 746 sc = cp->private; 747 KASSERT(cp->acr || cp->acw, 748 ("Consumer with zero access count in g_dev_strategy")); 749 biotrack(bp, __func__); 750 #ifdef INVARIANTS 751 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 752 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 753 bp->bio_resid = bp->bio_bcount; 754 biofinish(bp, NULL, EINVAL); 755 return; 756 } 757 #endif 758 mtx_lock(&sc->sc_mtx); 759 KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy")); 760 sc->sc_active++; 761 mtx_unlock(&sc->sc_mtx); 762 763 for (;;) { 764 /* 765 * XXX: This is not an ideal solution, but I believe it to 766 * XXX: deadlock safely, all things considered. 767 */ 768 bp2 = g_clone_bio(bp); 769 if (bp2 != NULL) 770 break; 771 pause("gdstrat", hz / 10); 772 } 773 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 774 bp2->bio_done = g_dev_done; 775 g_trace(G_T_BIO, 776 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 777 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 778 bp2->bio_data, bp2->bio_cmd); 779 g_io_request(bp2, cp); 780 KASSERT(cp->acr || cp->acw, 781 ("g_dev_strategy raced with g_dev_close and lost")); 782 783 } 784 785 /* 786 * g_dev_callback() 787 * 788 * Called by devfs when asynchronous device destruction is completed. 789 * - Mark that we have no attached device any more. 790 * - If there are no outstanding requests, schedule geom destruction. 791 * Otherwise destruction will be scheduled later by g_dev_done(). 792 */ 793 794 static void 795 g_dev_callback(void *arg) 796 { 797 struct g_consumer *cp; 798 struct g_dev_softc *sc; 799 int destroy; 800 801 cp = arg; 802 sc = cp->private; 803 g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name); 804 805 mtx_lock(&sc->sc_mtx); 806 sc->sc_dev = NULL; 807 sc->sc_alias = NULL; 808 destroy = (sc->sc_active == 0); 809 mtx_unlock(&sc->sc_mtx); 810 if (destroy) 811 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 812 } 813 814 /* 815 * g_dev_orphan() 816 * 817 * Called from below when the provider orphaned us. 818 * - Clear any dump settings. 819 * - Request asynchronous device destruction to prevent any more requests 820 * from coming in. The provider is already marked with an error, so 821 * anything which comes in the interim will be returned immediately. 822 */ 823 824 static void 825 g_dev_orphan(struct g_consumer *cp) 826 { 827 struct cdev *dev; 828 struct g_dev_softc *sc; 829 830 g_topology_assert(); 831 sc = cp->private; 832 dev = sc->sc_dev; 833 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name); 834 835 /* Reset any dump-area set on this device */ 836 if (dev->si_flags & SI_DUMPDEV) 837 (void)clear_dumper(curthread); 838 839 /* Destroy the struct cdev *so we get no more requests */ 840 destroy_dev_sched_cb(dev, g_dev_callback, cp); 841 } 842 843 DECLARE_GEOM_CLASS(g_dev_class, g_dev);
Cache object: 9267c71a5dccbb58f8debfe637180539
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