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("$FreeBSD$"); 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 u_int sc_active; 68 #define SC_A_DESTROY (1 << 31) 69 #define SC_A_OPEN (1 << 30) 70 #define SC_A_ACTIVE (SC_A_OPEN - 1) 71 }; 72 73 static d_open_t g_dev_open; 74 static d_close_t g_dev_close; 75 static d_strategy_t g_dev_strategy; 76 static d_ioctl_t g_dev_ioctl; 77 78 static struct cdevsw g_dev_cdevsw = { 79 .d_version = D_VERSION, 80 .d_open = g_dev_open, 81 .d_close = g_dev_close, 82 .d_read = physread, 83 .d_write = physwrite, 84 .d_ioctl = g_dev_ioctl, 85 .d_strategy = g_dev_strategy, 86 .d_name = "g_dev", 87 .d_flags = D_DISK | D_TRACKCLOSE, 88 }; 89 90 static g_init_t g_dev_init; 91 static g_fini_t g_dev_fini; 92 static g_taste_t g_dev_taste; 93 static g_orphan_t g_dev_orphan; 94 static g_attrchanged_t g_dev_attrchanged; 95 static g_resize_t g_dev_resize; 96 97 static struct g_class g_dev_class = { 98 .name = "DEV", 99 .version = G_VERSION, 100 .init = g_dev_init, 101 .fini = g_dev_fini, 102 .taste = g_dev_taste, 103 .orphan = g_dev_orphan, 104 .attrchanged = g_dev_attrchanged, 105 .resize = g_dev_resize 106 }; 107 108 /* 109 * We target 262144 (8 x 32768) sectors by default as this significantly 110 * increases the throughput on commonly used SSD's with a marginal 111 * increase in non-interruptible request latency. 112 */ 113 static uint64_t g_dev_del_max_sectors = 262144; 114 SYSCTL_DECL(_kern_geom); 115 SYSCTL_NODE(_kern_geom, OID_AUTO, dev, CTLFLAG_RW, 0, "GEOM_DEV stuff"); 116 SYSCTL_QUAD(_kern_geom_dev, OID_AUTO, delete_max_sectors, CTLFLAG_RW, 117 &g_dev_del_max_sectors, 0, "Maximum number of sectors in a single " 118 "delete request sent to the provider. Larger requests are chunked " 119 "so they can be interrupted. (0 = disable chunking)"); 120 121 static char *dumpdev = NULL; 122 static void 123 g_dev_init(struct g_class *mp) 124 { 125 126 dumpdev = kern_getenv("dumpdev"); 127 } 128 129 static void 130 g_dev_fini(struct g_class *mp) 131 { 132 133 freeenv(dumpdev); 134 dumpdev = NULL; 135 } 136 137 static int 138 g_dev_setdumpdev(struct cdev *dev, struct diocskerneldump_arg *kda) 139 { 140 struct g_kerneldump kd; 141 struct g_consumer *cp; 142 int error, len; 143 144 MPASS(dev != NULL && kda != NULL); 145 MPASS(kda->kda_index != KDA_REMOVE); 146 147 cp = dev->si_drv2; 148 len = sizeof(kd); 149 memset(&kd, 0, len); 150 kd.offset = 0; 151 kd.length = OFF_MAX; 152 error = g_io_getattr("GEOM::kerneldump", cp, &len, &kd); 153 if (error != 0) 154 return (error); 155 156 error = dumper_insert(&kd.di, devtoname(dev), kda); 157 if (error == 0) 158 dev->si_flags |= SI_DUMPDEV; 159 160 return (error); 161 } 162 163 static int 164 init_dumpdev(struct cdev *dev) 165 { 166 struct diocskerneldump_arg kda; 167 struct g_consumer *cp; 168 const char *devprefix = "/dev/", *devname; 169 int error; 170 size_t len; 171 172 bzero(&kda, sizeof(kda)); 173 kda.kda_index = KDA_APPEND; 174 175 if (dumpdev == NULL) 176 return (0); 177 178 len = strlen(devprefix); 179 devname = devtoname(dev); 180 if (strcmp(devname, dumpdev) != 0 && 181 (strncmp(dumpdev, devprefix, len) != 0 || 182 strcmp(devname, dumpdev + len) != 0)) 183 return (0); 184 185 cp = (struct g_consumer *)dev->si_drv2; 186 error = g_access(cp, 1, 0, 0); 187 if (error != 0) 188 return (error); 189 190 error = g_dev_setdumpdev(dev, &kda); 191 if (error == 0) { 192 freeenv(dumpdev); 193 dumpdev = NULL; 194 } 195 196 (void)g_access(cp, -1, 0, 0); 197 198 return (error); 199 } 200 201 static void 202 g_dev_destroy(void *arg, int flags __unused) 203 { 204 struct g_consumer *cp; 205 struct g_geom *gp; 206 struct g_dev_softc *sc; 207 char buf[SPECNAMELEN + 6]; 208 209 g_topology_assert(); 210 cp = arg; 211 gp = cp->geom; 212 sc = cp->private; 213 g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name); 214 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 215 devctl_notify_f("GEOM", "DEV", "DESTROY", buf, M_WAITOK); 216 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 217 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 218 g_detach(cp); 219 g_destroy_consumer(cp); 220 g_destroy_geom(gp); 221 mtx_destroy(&sc->sc_mtx); 222 g_free(sc); 223 } 224 225 void 226 g_dev_print(void) 227 { 228 struct g_geom *gp; 229 char const *p = ""; 230 231 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 232 printf("%s%s", p, gp->name); 233 p = " "; 234 } 235 printf("\n"); 236 } 237 238 static void 239 g_dev_set_physpath(struct g_consumer *cp) 240 { 241 struct g_dev_softc *sc; 242 char *physpath; 243 int error, physpath_len; 244 245 if (g_access(cp, 1, 0, 0) != 0) 246 return; 247 248 sc = cp->private; 249 physpath_len = MAXPATHLEN; 250 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO); 251 error = g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath); 252 g_access(cp, -1, 0, 0); 253 if (error == 0 && strlen(physpath) != 0) { 254 struct cdev *dev, *old_alias_dev; 255 struct cdev **alias_devp; 256 257 dev = sc->sc_dev; 258 old_alias_dev = sc->sc_alias; 259 alias_devp = (struct cdev **)&sc->sc_alias; 260 make_dev_physpath_alias(MAKEDEV_WAITOK, alias_devp, dev, 261 old_alias_dev, physpath); 262 } else if (sc->sc_alias) { 263 destroy_dev((struct cdev *)sc->sc_alias); 264 sc->sc_alias = NULL; 265 } 266 g_free(physpath); 267 } 268 269 static void 270 g_dev_set_media(struct g_consumer *cp) 271 { 272 struct g_dev_softc *sc; 273 struct cdev *dev; 274 char buf[SPECNAMELEN + 6]; 275 276 sc = cp->private; 277 dev = sc->sc_dev; 278 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 279 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 280 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK); 281 dev = sc->sc_alias; 282 if (dev != NULL) { 283 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 284 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 285 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK); 286 } 287 } 288 289 static void 290 g_dev_attrchanged(struct g_consumer *cp, const char *attr) 291 { 292 293 if (strcmp(attr, "GEOM::media") == 0) { 294 g_dev_set_media(cp); 295 return; 296 } 297 298 if (strcmp(attr, "GEOM::physpath") == 0) { 299 g_dev_set_physpath(cp); 300 return; 301 } 302 } 303 304 static void 305 g_dev_resize(struct g_consumer *cp) 306 { 307 char buf[SPECNAMELEN + 6]; 308 309 snprintf(buf, sizeof(buf), "cdev=%s", cp->provider->name); 310 devctl_notify_f("GEOM", "DEV", "SIZECHANGE", buf, M_WAITOK); 311 } 312 313 struct g_provider * 314 g_dev_getprovider(struct cdev *dev) 315 { 316 struct g_consumer *cp; 317 318 g_topology_assert(); 319 if (dev == NULL) 320 return (NULL); 321 if (dev->si_devsw != &g_dev_cdevsw) 322 return (NULL); 323 cp = dev->si_drv2; 324 return (cp->provider); 325 } 326 327 static struct g_geom * 328 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 329 { 330 struct g_geom *gp; 331 struct g_geom_alias *gap; 332 struct g_consumer *cp; 333 struct g_dev_softc *sc; 334 int error; 335 struct cdev *dev, *adev; 336 char buf[SPECNAMELEN + 6]; 337 338 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 339 g_topology_assert(); 340 gp = g_new_geomf(mp, "%s", pp->name); 341 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 342 mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF); 343 cp = g_new_consumer(gp); 344 cp->private = sc; 345 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 346 error = g_attach(cp, pp); 347 KASSERT(error == 0, 348 ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 349 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &dev, 350 &g_dev_cdevsw, NULL, UID_ROOT, GID_OPERATOR, 0640, "%s", gp->name); 351 if (error != 0) { 352 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n", 353 __func__, gp->name, error); 354 g_detach(cp); 355 g_destroy_consumer(cp); 356 g_destroy_geom(gp); 357 mtx_destroy(&sc->sc_mtx); 358 g_free(sc); 359 return (NULL); 360 } 361 dev->si_flags |= SI_UNMAPPED; 362 sc->sc_dev = dev; 363 364 dev->si_iosize_max = MAXPHYS; 365 dev->si_drv2 = cp; 366 error = init_dumpdev(dev); 367 if (error != 0) 368 printf("%s: init_dumpdev() failed (gp->name=%s, error=%d)\n", 369 __func__, gp->name, error); 370 371 g_dev_attrchanged(cp, "GEOM::physpath"); 372 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 373 devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK); 374 /* 375 * Now add all the aliases for this drive 376 */ 377 LIST_FOREACH(gap, &pp->geom->aliases, ga_next) { 378 error = make_dev_alias_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &adev, dev, 379 "%s", gap->ga_alias); 380 if (error) { 381 printf("%s: make_dev_alias_p() failed (name=%s, error=%d)\n", 382 __func__, gap->ga_alias, error); 383 continue; 384 } 385 snprintf(buf, sizeof(buf), "cdev=%s", gap->ga_alias); 386 devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK); 387 } 388 389 return (gp); 390 } 391 392 static int 393 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 394 { 395 struct g_consumer *cp; 396 struct g_dev_softc *sc; 397 int error, r, w, e; 398 399 cp = dev->si_drv2; 400 if (cp == NULL) 401 return (ENXIO); /* g_dev_taste() not done yet */ 402 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 403 cp->geom->name, flags, fmt, td); 404 405 r = flags & FREAD ? 1 : 0; 406 w = flags & FWRITE ? 1 : 0; 407 #ifdef notyet 408 e = flags & O_EXCL ? 1 : 0; 409 #else 410 e = 0; 411 #endif 412 413 /* 414 * This happens on attempt to open a device node with O_EXEC. 415 */ 416 if (r + w + e == 0) 417 return (EINVAL); 418 419 if (w) { 420 /* 421 * When running in very secure mode, do not allow 422 * opens for writing of any disks. 423 */ 424 error = securelevel_ge(td->td_ucred, 2); 425 if (error) 426 return (error); 427 } 428 g_topology_lock(); 429 error = g_access(cp, r, w, e); 430 g_topology_unlock(); 431 if (error == 0) { 432 sc = cp->private; 433 mtx_lock(&sc->sc_mtx); 434 if (sc->sc_open == 0 && (sc->sc_active & SC_A_ACTIVE) != 0) 435 wakeup(&sc->sc_active); 436 sc->sc_open += r + w + e; 437 if (sc->sc_open == 0) 438 atomic_clear_int(&sc->sc_active, SC_A_OPEN); 439 else 440 atomic_set_int(&sc->sc_active, SC_A_OPEN); 441 mtx_unlock(&sc->sc_mtx); 442 } 443 return (error); 444 } 445 446 static int 447 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 448 { 449 struct g_consumer *cp; 450 struct g_dev_softc *sc; 451 int error, r, w, e; 452 453 cp = dev->si_drv2; 454 if (cp == NULL) 455 return (ENXIO); 456 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 457 cp->geom->name, flags, fmt, td); 458 459 r = flags & FREAD ? -1 : 0; 460 w = flags & FWRITE ? -1 : 0; 461 #ifdef notyet 462 e = flags & O_EXCL ? -1 : 0; 463 #else 464 e = 0; 465 #endif 466 467 /* 468 * The vgonel(9) - caused by eg. forced unmount of devfs - calls 469 * VOP_CLOSE(9) on devfs vnode without any FREAD or FWRITE flags, 470 * which would result in zero deltas, which in turn would cause 471 * panic in g_access(9). 472 * 473 * Note that we cannot zero the counters (ie. do "r = cp->acr" 474 * etc) instead, because the consumer might be opened in another 475 * devfs instance. 476 */ 477 if (r + w + e == 0) 478 return (EINVAL); 479 480 sc = cp->private; 481 mtx_lock(&sc->sc_mtx); 482 sc->sc_open += r + w + e; 483 if (sc->sc_open == 0) 484 atomic_clear_int(&sc->sc_active, SC_A_OPEN); 485 else 486 atomic_set_int(&sc->sc_active, SC_A_OPEN); 487 while (sc->sc_open == 0 && (sc->sc_active & SC_A_ACTIVE) != 0) 488 msleep(&sc->sc_active, &sc->sc_mtx, 0, "g_dev_close", hz / 10); 489 mtx_unlock(&sc->sc_mtx); 490 g_topology_lock(); 491 error = g_access(cp, r, w, e); 492 g_topology_unlock(); 493 return (error); 494 } 495 496 /* 497 * XXX: Until we have unmessed the ioctl situation, there is a race against 498 * XXX: a concurrent orphanization. We cannot close it by holding topology 499 * XXX: since that would prevent us from doing our job, and stalling events 500 * XXX: will break (actually: stall) the BSD disklabel hacks. 501 */ 502 static int 503 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 504 { 505 struct g_consumer *cp; 506 struct g_provider *pp; 507 off_t offset, length, chunk, odd; 508 int i, error; 509 #ifdef COMPAT_FREEBSD12 510 struct diocskerneldump_arg kda_copy; 511 #endif 512 513 cp = dev->si_drv2; 514 pp = cp->provider; 515 516 error = 0; 517 KASSERT(cp->acr || cp->acw, 518 ("Consumer with zero access count in g_dev_ioctl")); 519 520 i = IOCPARM_LEN(cmd); 521 switch (cmd) { 522 case DIOCGSECTORSIZE: 523 *(u_int *)data = cp->provider->sectorsize; 524 if (*(u_int *)data == 0) 525 error = ENOENT; 526 break; 527 case DIOCGMEDIASIZE: 528 *(off_t *)data = cp->provider->mediasize; 529 if (*(off_t *)data == 0) 530 error = ENOENT; 531 break; 532 case DIOCGFWSECTORS: 533 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 534 if (error == 0 && *(u_int *)data == 0) 535 error = ENOENT; 536 break; 537 case DIOCGFWHEADS: 538 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 539 if (error == 0 && *(u_int *)data == 0) 540 error = ENOENT; 541 break; 542 case DIOCGFRONTSTUFF: 543 error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 544 break; 545 #ifdef COMPAT_FREEBSD11 546 case DIOCSKERNELDUMP_FREEBSD11: 547 { 548 struct diocskerneldump_arg kda; 549 550 gone_in(13, "FreeBSD 11.x ABI compat"); 551 552 bzero(&kda, sizeof(kda)); 553 kda.kda_encryption = KERNELDUMP_ENC_NONE; 554 kda.kda_index = (*(u_int *)data ? 0 : KDA_REMOVE_ALL); 555 if (kda.kda_index == KDA_REMOVE_ALL) 556 error = dumper_remove(devtoname(dev), &kda); 557 else 558 error = g_dev_setdumpdev(dev, &kda); 559 break; 560 } 561 #endif 562 #ifdef COMPAT_FREEBSD12 563 case DIOCSKERNELDUMP_FREEBSD12: 564 { 565 struct diocskerneldump_arg_freebsd12 *kda12; 566 567 gone_in(14, "FreeBSD 12.x ABI compat"); 568 569 kda12 = (void *)data; 570 memcpy(&kda_copy, kda12, sizeof(kda_copy)); 571 kda_copy.kda_index = (kda12->kda12_enable ? 572 0 : KDA_REMOVE_ALL); 573 574 explicit_bzero(kda12, sizeof(*kda12)); 575 /* Kludge to pass kda_copy to kda in fallthrough. */ 576 data = (void *)&kda_copy; 577 } 578 /* FALLTHROUGH */ 579 #endif 580 case DIOCSKERNELDUMP: 581 { 582 struct diocskerneldump_arg *kda; 583 uint8_t *encryptedkey; 584 585 kda = (struct diocskerneldump_arg *)data; 586 if (kda->kda_index == KDA_REMOVE_ALL || 587 kda->kda_index == KDA_REMOVE_DEV || 588 kda->kda_index == KDA_REMOVE) { 589 error = dumper_remove(devtoname(dev), kda); 590 explicit_bzero(kda, sizeof(*kda)); 591 break; 592 } 593 594 if (kda->kda_encryption != KERNELDUMP_ENC_NONE) { 595 if (kda->kda_encryptedkeysize == 0 || 596 kda->kda_encryptedkeysize > 597 KERNELDUMP_ENCKEY_MAX_SIZE) { 598 explicit_bzero(kda, sizeof(*kda)); 599 return (EINVAL); 600 } 601 encryptedkey = malloc(kda->kda_encryptedkeysize, M_TEMP, 602 M_WAITOK); 603 error = copyin(kda->kda_encryptedkey, encryptedkey, 604 kda->kda_encryptedkeysize); 605 } else { 606 encryptedkey = NULL; 607 } 608 if (error == 0) { 609 kda->kda_encryptedkey = encryptedkey; 610 error = g_dev_setdumpdev(dev, kda); 611 } 612 if (encryptedkey != NULL) { 613 explicit_bzero(encryptedkey, kda->kda_encryptedkeysize); 614 free(encryptedkey, M_TEMP); 615 } 616 explicit_bzero(kda, sizeof(*kda)); 617 break; 618 } 619 case DIOCGFLUSH: 620 error = g_io_flush(cp); 621 break; 622 case DIOCGDELETE: 623 offset = ((off_t *)data)[0]; 624 length = ((off_t *)data)[1]; 625 if ((offset % cp->provider->sectorsize) != 0 || 626 (length % cp->provider->sectorsize) != 0 || length <= 0) { 627 printf("%s: offset=%jd length=%jd\n", __func__, offset, 628 length); 629 error = EINVAL; 630 break; 631 } 632 if ((cp->provider->mediasize > 0) && 633 (offset >= cp->provider->mediasize)) { 634 /* 635 * Catch out-of-bounds requests here. The problem is 636 * that due to historical GEOM I/O implementation 637 * peculatities, g_delete_data() would always return 638 * success for requests starting just the next byte 639 * after providers media boundary. Condition check on 640 * non-zero media size, since that condition would 641 * (most likely) cause ENXIO instead. 642 */ 643 error = EIO; 644 break; 645 } 646 while (length > 0) { 647 chunk = length; 648 if (g_dev_del_max_sectors != 0 && chunk > 649 g_dev_del_max_sectors * cp->provider->sectorsize) { 650 chunk = g_dev_del_max_sectors * 651 cp->provider->sectorsize; 652 if (cp->provider->stripesize > 0) { 653 odd = (offset + chunk + 654 cp->provider->stripeoffset) % 655 cp->provider->stripesize; 656 if (chunk > odd) 657 chunk -= odd; 658 } 659 } 660 error = g_delete_data(cp, offset, chunk); 661 length -= chunk; 662 offset += chunk; 663 if (error) 664 break; 665 /* 666 * Since the request size can be large, the service 667 * time can be is likewise. We make this ioctl 668 * interruptible by checking for signals for each bio. 669 */ 670 if (SIGPENDING(td)) 671 break; 672 } 673 break; 674 case DIOCGIDENT: 675 error = g_io_getattr("GEOM::ident", cp, &i, data); 676 break; 677 case DIOCGPROVIDERNAME: 678 if (pp == NULL) 679 return (ENOENT); 680 strlcpy(data, pp->name, i); 681 break; 682 case DIOCGSTRIPESIZE: 683 *(off_t *)data = cp->provider->stripesize; 684 break; 685 case DIOCGSTRIPEOFFSET: 686 *(off_t *)data = cp->provider->stripeoffset; 687 break; 688 case DIOCGPHYSPATH: 689 error = g_io_getattr("GEOM::physpath", cp, &i, data); 690 if (error == 0 && *(char *)data == '\0') 691 error = ENOENT; 692 break; 693 case DIOCGATTR: { 694 struct diocgattr_arg *arg = (struct diocgattr_arg *)data; 695 696 if (arg->len > sizeof(arg->value)) { 697 error = EINVAL; 698 break; 699 } 700 error = g_io_getattr(arg->name, cp, &arg->len, &arg->value); 701 break; 702 } 703 case DIOCZONECMD: { 704 struct disk_zone_args *zone_args =(struct disk_zone_args *)data; 705 struct disk_zone_rep_entry *new_entries, *old_entries; 706 struct disk_zone_report *rep; 707 size_t alloc_size; 708 709 old_entries = NULL; 710 new_entries = NULL; 711 rep = NULL; 712 alloc_size = 0; 713 714 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES) { 715 rep = &zone_args->zone_params.report; 716 #define MAXENTRIES (MAXPHYS / sizeof(struct disk_zone_rep_entry)) 717 if (rep->entries_allocated > MAXENTRIES) 718 rep->entries_allocated = MAXENTRIES; 719 alloc_size = rep->entries_allocated * 720 sizeof(struct disk_zone_rep_entry); 721 if (alloc_size != 0) 722 new_entries = g_malloc(alloc_size, 723 M_WAITOK| M_ZERO); 724 old_entries = rep->entries; 725 rep->entries = new_entries; 726 } 727 error = g_io_zonecmd(zone_args, cp); 728 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES && 729 alloc_size != 0 && error == 0) 730 error = copyout(new_entries, old_entries, alloc_size); 731 if (old_entries != NULL && rep != NULL) 732 rep->entries = old_entries; 733 if (new_entries != NULL) 734 g_free(new_entries); 735 break; 736 } 737 default: 738 if (cp->provider->geom->ioctl != NULL) { 739 error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td); 740 } else { 741 error = ENOIOCTL; 742 } 743 } 744 745 return (error); 746 } 747 748 static void 749 g_dev_done(struct bio *bp2) 750 { 751 struct g_consumer *cp; 752 struct g_dev_softc *sc; 753 struct bio *bp; 754 int active; 755 756 cp = bp2->bio_from; 757 sc = cp->private; 758 bp = bp2->bio_parent; 759 bp->bio_error = bp2->bio_error; 760 bp->bio_completed = bp2->bio_completed; 761 bp->bio_resid = bp->bio_length - bp2->bio_completed; 762 if (bp2->bio_cmd == BIO_ZONE) 763 bcopy(&bp2->bio_zone, &bp->bio_zone, sizeof(bp->bio_zone)); 764 765 if (bp2->bio_error != 0) { 766 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 767 bp2, bp2->bio_error); 768 bp->bio_flags |= BIO_ERROR; 769 } else { 770 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 771 bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed); 772 } 773 g_destroy_bio(bp2); 774 active = atomic_fetchadd_int(&sc->sc_active, -1) - 1; 775 if ((active & SC_A_ACTIVE) == 0) { 776 if ((active & SC_A_OPEN) == 0) 777 wakeup(&sc->sc_active); 778 if (active & SC_A_DESTROY) 779 g_post_event(g_dev_destroy, cp, M_NOWAIT, NULL); 780 } 781 biodone(bp); 782 } 783 784 static void 785 g_dev_strategy(struct bio *bp) 786 { 787 struct g_consumer *cp; 788 struct bio *bp2; 789 struct cdev *dev; 790 struct g_dev_softc *sc; 791 792 KASSERT(bp->bio_cmd == BIO_READ || 793 bp->bio_cmd == BIO_WRITE || 794 bp->bio_cmd == BIO_DELETE || 795 bp->bio_cmd == BIO_FLUSH || 796 bp->bio_cmd == BIO_ZONE, 797 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 798 dev = bp->bio_dev; 799 cp = dev->si_drv2; 800 sc = cp->private; 801 KASSERT(cp->acr || cp->acw, 802 ("Consumer with zero access count in g_dev_strategy")); 803 biotrack(bp, __func__); 804 #ifdef INVARIANTS 805 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 806 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 807 bp->bio_resid = bp->bio_bcount; 808 biofinish(bp, NULL, EINVAL); 809 return; 810 } 811 #endif 812 KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy")); 813 atomic_add_int(&sc->sc_active, 1); 814 815 for (;;) { 816 /* 817 * XXX: This is not an ideal solution, but I believe it to 818 * XXX: deadlock safely, all things considered. 819 */ 820 bp2 = g_clone_bio(bp); 821 if (bp2 != NULL) 822 break; 823 pause("gdstrat", hz / 10); 824 } 825 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 826 bp2->bio_done = g_dev_done; 827 g_trace(G_T_BIO, 828 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 829 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 830 bp2->bio_data, bp2->bio_cmd); 831 g_io_request(bp2, cp); 832 KASSERT(cp->acr || cp->acw, 833 ("g_dev_strategy raced with g_dev_close and lost")); 834 835 } 836 837 /* 838 * g_dev_callback() 839 * 840 * Called by devfs when asynchronous device destruction is completed. 841 * - Mark that we have no attached device any more. 842 * - If there are no outstanding requests, schedule geom destruction. 843 * Otherwise destruction will be scheduled later by g_dev_done(). 844 */ 845 846 static void 847 g_dev_callback(void *arg) 848 { 849 struct g_consumer *cp; 850 struct g_dev_softc *sc; 851 int active; 852 853 cp = arg; 854 sc = cp->private; 855 g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name); 856 857 sc->sc_dev = NULL; 858 sc->sc_alias = NULL; 859 active = atomic_fetchadd_int(&sc->sc_active, SC_A_DESTROY); 860 if ((active & SC_A_ACTIVE) == 0) 861 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 862 } 863 864 /* 865 * g_dev_orphan() 866 * 867 * Called from below when the provider orphaned us. 868 * - Clear any dump settings. 869 * - Request asynchronous device destruction to prevent any more requests 870 * from coming in. The provider is already marked with an error, so 871 * anything which comes in the interim will be returned immediately. 872 */ 873 874 static void 875 g_dev_orphan(struct g_consumer *cp) 876 { 877 struct cdev *dev; 878 struct g_dev_softc *sc; 879 880 g_topology_assert(); 881 sc = cp->private; 882 dev = sc->sc_dev; 883 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name); 884 885 /* Reset any dump-area set on this device */ 886 if (dev->si_flags & SI_DUMPDEV) { 887 struct diocskerneldump_arg kda; 888 889 bzero(&kda, sizeof(kda)); 890 kda.kda_index = KDA_REMOVE_DEV; 891 (void)dumper_remove(devtoname(dev), &kda); 892 } 893 894 /* Destroy the struct cdev *so we get no more requests */ 895 delist_dev(dev); 896 destroy_dev_sched_cb(dev, g_dev_callback, cp); 897 } 898 899 DECLARE_GEOM_CLASS(g_dev_class, g_dev); 900