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/param.h> 39 #include <sys/systm.h> 40 #include <sys/malloc.h> 41 #include <sys/kernel.h> 42 #include <sys/conf.h> 43 #include <sys/ctype.h> 44 #include <sys/bio.h> 45 #include <sys/devctl.h> 46 #include <sys/lock.h> 47 #include <sys/mutex.h> 48 #include <sys/proc.h> 49 #include <sys/errno.h> 50 #include <sys/time.h> 51 #include <sys/disk.h> 52 #include <sys/fcntl.h> 53 #include <sys/limits.h> 54 #include <sys/selinfo.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 u_int sc_active; 66 struct selinfo sc_selinfo; 67 #define SC_A_DESTROY (1 << 31) 68 #define SC_A_OPEN (1 << 30) 69 #define SC_A_ACTIVE (SC_A_OPEN - 1) 70 }; 71 72 static d_open_t g_dev_open; 73 static d_close_t g_dev_close; 74 static d_strategy_t g_dev_strategy; 75 static d_ioctl_t g_dev_ioctl; 76 static d_kqfilter_t g_dev_kqfilter; 77 78 static void gdev_filter_detach(struct knote *kn); 79 static int gdev_filter_vnode(struct knote *kn, long hint); 80 81 static struct filterops gdev_filterops_vnode = { 82 .f_isfd = 1, 83 .f_detach = gdev_filter_detach, 84 .f_event = gdev_filter_vnode, 85 }; 86 87 static struct cdevsw g_dev_cdevsw = { 88 .d_version = D_VERSION, 89 .d_open = g_dev_open, 90 .d_close = g_dev_close, 91 .d_read = physread, 92 .d_write = physwrite, 93 .d_ioctl = g_dev_ioctl, 94 .d_strategy = g_dev_strategy, 95 .d_name = "g_dev", 96 .d_flags = D_DISK | D_TRACKCLOSE, 97 .d_kqfilter = g_dev_kqfilter, 98 }; 99 100 static g_init_t g_dev_init; 101 static g_fini_t g_dev_fini; 102 static g_taste_t g_dev_taste; 103 static g_orphan_t g_dev_orphan; 104 static g_attrchanged_t g_dev_attrchanged; 105 static g_resize_t g_dev_resize; 106 107 static struct g_class g_dev_class = { 108 .name = "DEV", 109 .version = G_VERSION, 110 .init = g_dev_init, 111 .fini = g_dev_fini, 112 .taste = g_dev_taste, 113 .orphan = g_dev_orphan, 114 .attrchanged = g_dev_attrchanged, 115 .resize = g_dev_resize 116 }; 117 118 /* 119 * We target 262144 (8 x 32768) sectors by default as this significantly 120 * increases the throughput on commonly used SSD's with a marginal 121 * increase in non-interruptible request latency. 122 */ 123 static uint64_t g_dev_del_max_sectors = 262144; 124 SYSCTL_DECL(_kern_geom); 125 SYSCTL_NODE(_kern_geom, OID_AUTO, dev, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 126 "GEOM_DEV stuff"); 127 SYSCTL_QUAD(_kern_geom_dev, OID_AUTO, delete_max_sectors, CTLFLAG_RW, 128 &g_dev_del_max_sectors, 0, "Maximum number of sectors in a single " 129 "delete request sent to the provider. Larger requests are chunked " 130 "so they can be interrupted. (0 = disable chunking)"); 131 132 static char *dumpdev = NULL; 133 static void 134 g_dev_init(struct g_class *mp) 135 { 136 137 dumpdev = kern_getenv("dumpdev"); 138 } 139 140 static void 141 g_dev_fini(struct g_class *mp) 142 { 143 144 freeenv(dumpdev); 145 dumpdev = NULL; 146 } 147 148 static int 149 g_dev_setdumpdev(struct cdev *dev, struct diocskerneldump_arg *kda) 150 { 151 struct g_kerneldump kd; 152 struct g_consumer *cp; 153 int error, len; 154 155 MPASS(dev != NULL && kda != NULL); 156 MPASS(kda->kda_index != KDA_REMOVE); 157 158 cp = dev->si_drv2; 159 len = sizeof(kd); 160 memset(&kd, 0, len); 161 kd.offset = 0; 162 kd.length = OFF_MAX; 163 error = g_io_getattr("GEOM::kerneldump", cp, &len, &kd); 164 if (error != 0) 165 return (error); 166 167 error = dumper_insert(&kd.di, devtoname(dev), kda); 168 if (error == 0) 169 dev->si_flags |= SI_DUMPDEV; 170 171 return (error); 172 } 173 174 static int 175 init_dumpdev(struct cdev *dev) 176 { 177 struct diocskerneldump_arg kda; 178 struct g_consumer *cp; 179 const char *devprefix = _PATH_DEV, *devname; 180 int error; 181 size_t len; 182 183 bzero(&kda, sizeof(kda)); 184 kda.kda_index = KDA_APPEND; 185 186 if (dumpdev == NULL) 187 return (0); 188 189 len = strlen(devprefix); 190 devname = devtoname(dev); 191 if (strcmp(devname, dumpdev) != 0 && 192 (strncmp(dumpdev, devprefix, len) != 0 || 193 strcmp(devname, dumpdev + len) != 0)) 194 return (0); 195 196 cp = (struct g_consumer *)dev->si_drv2; 197 error = g_access(cp, 1, 0, 0); 198 if (error != 0) 199 return (error); 200 201 error = g_dev_setdumpdev(dev, &kda); 202 if (error == 0) { 203 freeenv(dumpdev); 204 dumpdev = NULL; 205 } 206 207 (void)g_access(cp, -1, 0, 0); 208 209 return (error); 210 } 211 212 static void 213 g_dev_destroy(void *arg, int flags __unused) 214 { 215 struct g_consumer *cp; 216 struct g_geom *gp; 217 struct g_dev_softc *sc; 218 char buf[SPECNAMELEN + 6]; 219 220 g_topology_assert(); 221 cp = arg; 222 gp = cp->geom; 223 sc = cp->private; 224 g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name); 225 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 226 devctl_notify("GEOM", "DEV", "DESTROY", buf); 227 knlist_clear(&sc->sc_selinfo.si_note, 0); 228 knlist_destroy(&sc->sc_selinfo.si_note); 229 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 230 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 231 g_detach(cp); 232 g_destroy_consumer(cp); 233 g_destroy_geom(gp); 234 mtx_destroy(&sc->sc_mtx); 235 g_free(sc); 236 } 237 238 void 239 g_dev_print(void) 240 { 241 struct g_geom *gp; 242 char const *p = ""; 243 244 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 245 printf("%s%s", p, gp->name); 246 p = " "; 247 } 248 printf("\n"); 249 } 250 251 static void 252 g_dev_set_physpath(struct g_consumer *cp) 253 { 254 struct g_dev_softc *sc; 255 char *physpath; 256 int error, physpath_len; 257 258 if (g_access(cp, 1, 0, 0) != 0) 259 return; 260 261 sc = cp->private; 262 physpath_len = MAXPATHLEN; 263 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO); 264 error = g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath); 265 g_access(cp, -1, 0, 0); 266 if (error == 0 && strlen(physpath) != 0) { 267 struct cdev *dev, *old_alias_dev; 268 struct cdev **alias_devp; 269 270 dev = sc->sc_dev; 271 old_alias_dev = sc->sc_alias; 272 alias_devp = (struct cdev **)&sc->sc_alias; 273 make_dev_physpath_alias(MAKEDEV_WAITOK | MAKEDEV_CHECKNAME, 274 alias_devp, dev, old_alias_dev, physpath); 275 } else if (sc->sc_alias) { 276 destroy_dev((struct cdev *)sc->sc_alias); 277 sc->sc_alias = NULL; 278 } 279 g_free(physpath); 280 } 281 282 static void 283 g_dev_set_media(struct g_consumer *cp) 284 { 285 struct g_dev_softc *sc; 286 struct cdev *dev; 287 char buf[SPECNAMELEN + 6]; 288 289 sc = cp->private; 290 dev = sc->sc_dev; 291 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 292 devctl_notify("DEVFS", "CDEV", "MEDIACHANGE", buf); 293 devctl_notify("GEOM", "DEV", "MEDIACHANGE", buf); 294 dev = sc->sc_alias; 295 if (dev != NULL) { 296 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 297 devctl_notify("DEVFS", "CDEV", "MEDIACHANGE", buf); 298 devctl_notify("GEOM", "DEV", "MEDIACHANGE", buf); 299 } 300 } 301 302 static void 303 g_dev_attrchanged(struct g_consumer *cp, const char *attr) 304 { 305 306 if (strcmp(attr, "GEOM::media") == 0) { 307 g_dev_set_media(cp); 308 return; 309 } 310 311 if (strcmp(attr, "GEOM::physpath") == 0) { 312 g_dev_set_physpath(cp); 313 return; 314 } 315 } 316 317 static void 318 g_dev_resize(struct g_consumer *cp) 319 { 320 struct g_dev_softc *sc; 321 char buf[SPECNAMELEN + 6]; 322 323 sc = cp->private; 324 KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, NOTE_ATTRIB); 325 326 snprintf(buf, sizeof(buf), "cdev=%s", cp->provider->name); 327 devctl_notify("GEOM", "DEV", "SIZECHANGE", buf); 328 } 329 330 struct g_provider * 331 g_dev_getprovider(struct cdev *dev) 332 { 333 struct g_consumer *cp; 334 335 g_topology_assert(); 336 if (dev == NULL) 337 return (NULL); 338 if (dev->si_devsw != &g_dev_cdevsw) 339 return (NULL); 340 cp = dev->si_drv2; 341 return (cp->provider); 342 } 343 344 static struct g_geom * 345 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 346 { 347 struct g_geom *gp; 348 struct g_geom_alias *gap; 349 struct g_consumer *cp; 350 struct g_dev_softc *sc; 351 int error; 352 struct cdev *dev, *adev; 353 char buf[SPECNAMELEN + 6]; 354 struct make_dev_args args; 355 356 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 357 g_topology_assert(); 358 gp = g_new_geomf(mp, "%s", pp->name); 359 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 360 mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF); 361 cp = g_new_consumer(gp); 362 cp->private = sc; 363 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 364 error = g_attach(cp, pp); 365 if (error != 0) { 366 printf("%s: g_dev_taste(%s) failed to g_attach, error=%d\n", 367 __func__, pp->name, error); 368 g_destroy_consumer(cp); 369 g_destroy_geom(gp); 370 mtx_destroy(&sc->sc_mtx); 371 g_free(sc); 372 return (NULL); 373 } 374 make_dev_args_init(&args); 375 args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK; 376 args.mda_devsw = &g_dev_cdevsw; 377 args.mda_cr = NULL; 378 args.mda_uid = UID_ROOT; 379 args.mda_gid = GID_OPERATOR; 380 args.mda_mode = 0640; 381 args.mda_si_drv1 = sc; 382 args.mda_si_drv2 = cp; 383 error = make_dev_s(&args, &sc->sc_dev, "%s", gp->name); 384 if (error != 0) { 385 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n", 386 __func__, gp->name, error); 387 g_detach(cp); 388 g_destroy_consumer(cp); 389 g_destroy_geom(gp); 390 mtx_destroy(&sc->sc_mtx); 391 g_free(sc); 392 return (NULL); 393 } 394 dev = sc->sc_dev; 395 dev->si_flags |= SI_UNMAPPED; 396 dev->si_iosize_max = maxphys; 397 knlist_init_mtx(&sc->sc_selinfo.si_note, &sc->sc_mtx); 398 error = init_dumpdev(dev); 399 if (error != 0) 400 printf("%s: init_dumpdev() failed (gp->name=%s, error=%d)\n", 401 __func__, gp->name, error); 402 403 g_dev_attrchanged(cp, "GEOM::physpath"); 404 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 405 devctl_notify("GEOM", "DEV", "CREATE", buf); 406 /* 407 * Now add all the aliases for this drive 408 */ 409 LIST_FOREACH(gap, &pp->aliases, ga_next) { 410 error = make_dev_alias_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &adev, dev, 411 "%s", gap->ga_alias); 412 if (error) { 413 printf("%s: make_dev_alias_p() failed (name=%s, error=%d)\n", 414 __func__, gap->ga_alias, error); 415 continue; 416 } 417 snprintf(buf, sizeof(buf), "cdev=%s", gap->ga_alias); 418 devctl_notify("GEOM", "DEV", "CREATE", buf); 419 } 420 421 return (gp); 422 } 423 424 static int 425 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 426 { 427 struct g_consumer *cp; 428 struct g_dev_softc *sc; 429 int error, r, w, e; 430 431 cp = dev->si_drv2; 432 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 433 cp->geom->name, flags, fmt, td); 434 435 r = flags & FREAD ? 1 : 0; 436 w = flags & FWRITE ? 1 : 0; 437 #ifdef notyet 438 e = flags & O_EXCL ? 1 : 0; 439 #else 440 e = 0; 441 #endif 442 443 /* 444 * This happens on attempt to open a device node with O_EXEC. 445 */ 446 if (r + w + e == 0) 447 return (EINVAL); 448 449 if (w) { 450 /* 451 * When running in very secure mode, do not allow 452 * opens for writing of any disks. 453 */ 454 error = securelevel_ge(td->td_ucred, 2); 455 if (error) 456 return (error); 457 } 458 g_topology_lock(); 459 error = g_access(cp, r, w, e); 460 g_topology_unlock(); 461 if (error == 0) { 462 sc = dev->si_drv1; 463 mtx_lock(&sc->sc_mtx); 464 if (sc->sc_open == 0 && (sc->sc_active & SC_A_ACTIVE) != 0) 465 wakeup(&sc->sc_active); 466 sc->sc_open += r + w + e; 467 if (sc->sc_open == 0) 468 atomic_clear_int(&sc->sc_active, SC_A_OPEN); 469 else 470 atomic_set_int(&sc->sc_active, SC_A_OPEN); 471 KNOTE_LOCKED(&sc->sc_selinfo.si_note, NOTE_OPEN); 472 mtx_unlock(&sc->sc_mtx); 473 } 474 return (error); 475 } 476 477 static int 478 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 479 { 480 struct g_consumer *cp; 481 struct g_dev_softc *sc; 482 int error, r, w, e; 483 484 cp = dev->si_drv2; 485 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 486 cp->geom->name, flags, fmt, td); 487 488 r = flags & FREAD ? -1 : 0; 489 w = flags & FWRITE ? -1 : 0; 490 #ifdef notyet 491 e = flags & O_EXCL ? -1 : 0; 492 #else 493 e = 0; 494 #endif 495 496 /* 497 * The vgonel(9) - caused by eg. forced unmount of devfs - calls 498 * VOP_CLOSE(9) on devfs vnode without any FREAD or FWRITE flags, 499 * which would result in zero deltas, which in turn would cause 500 * panic in g_access(9). 501 * 502 * Note that we cannot zero the counters (ie. do "r = cp->acr" 503 * etc) instead, because the consumer might be opened in another 504 * devfs instance. 505 */ 506 if (r + w + e == 0) 507 return (EINVAL); 508 509 sc = dev->si_drv1; 510 mtx_lock(&sc->sc_mtx); 511 sc->sc_open += r + w + e; 512 if (sc->sc_open == 0) 513 atomic_clear_int(&sc->sc_active, SC_A_OPEN); 514 else 515 atomic_set_int(&sc->sc_active, SC_A_OPEN); 516 while (sc->sc_open == 0 && (sc->sc_active & SC_A_ACTIVE) != 0) 517 msleep(&sc->sc_active, &sc->sc_mtx, 0, "g_dev_close", hz / 10); 518 KNOTE_LOCKED(&sc->sc_selinfo.si_note, NOTE_CLOSE | (w ? NOTE_CLOSE_WRITE : 0)); 519 mtx_unlock(&sc->sc_mtx); 520 g_topology_lock(); 521 error = g_access(cp, r, w, e); 522 g_topology_unlock(); 523 return (error); 524 } 525 526 static int 527 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 528 { 529 struct g_consumer *cp; 530 struct g_provider *pp; 531 off_t offset, length, chunk, odd; 532 int i, error; 533 534 cp = dev->si_drv2; 535 pp = cp->provider; 536 537 /* If consumer or provider is dying, don't disturb. */ 538 if (cp->flags & G_CF_ORPHAN) 539 return (ENXIO); 540 if (pp->error) 541 return (pp->error); 542 543 error = 0; 544 KASSERT(cp->acr || cp->acw, 545 ("Consumer with zero access count in g_dev_ioctl")); 546 547 i = IOCPARM_LEN(cmd); 548 switch (cmd) { 549 case DIOCGSECTORSIZE: 550 *(u_int *)data = pp->sectorsize; 551 if (*(u_int *)data == 0) 552 error = ENOENT; 553 break; 554 case DIOCGMEDIASIZE: 555 *(off_t *)data = pp->mediasize; 556 if (*(off_t *)data == 0) 557 error = ENOENT; 558 break; 559 case DIOCGFWSECTORS: 560 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 561 if (error == 0 && *(u_int *)data == 0) 562 error = ENOENT; 563 break; 564 case DIOCGFWHEADS: 565 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 566 if (error == 0 && *(u_int *)data == 0) 567 error = ENOENT; 568 break; 569 case DIOCSKERNELDUMP: 570 { 571 struct diocskerneldump_arg *kda; 572 uint8_t *encryptedkey; 573 574 kda = (struct diocskerneldump_arg *)data; 575 if (kda->kda_index == KDA_REMOVE_ALL || 576 kda->kda_index == KDA_REMOVE_DEV || 577 kda->kda_index == KDA_REMOVE) { 578 error = dumper_remove(devtoname(dev), kda); 579 explicit_bzero(kda, sizeof(*kda)); 580 break; 581 } 582 583 if (kda->kda_encryption != KERNELDUMP_ENC_NONE) { 584 if (kda->kda_encryptedkeysize == 0 || 585 kda->kda_encryptedkeysize > 586 KERNELDUMP_ENCKEY_MAX_SIZE) { 587 explicit_bzero(kda, sizeof(*kda)); 588 return (EINVAL); 589 } 590 encryptedkey = malloc(kda->kda_encryptedkeysize, M_TEMP, 591 M_WAITOK); 592 error = copyin(kda->kda_encryptedkey, encryptedkey, 593 kda->kda_encryptedkeysize); 594 } else { 595 encryptedkey = NULL; 596 } 597 if (error == 0) { 598 kda->kda_encryptedkey = encryptedkey; 599 error = g_dev_setdumpdev(dev, kda); 600 } 601 zfree(encryptedkey, M_TEMP); 602 explicit_bzero(kda, sizeof(*kda)); 603 break; 604 } 605 case DIOCGFLUSH: 606 error = g_io_flush(cp); 607 break; 608 case DIOCGDELETE: 609 offset = ((off_t *)data)[0]; 610 length = ((off_t *)data)[1]; 611 if ((offset % pp->sectorsize) != 0 || 612 (length % pp->sectorsize) != 0 || length <= 0) { 613 printf("%s: offset=%jd length=%jd\n", __func__, offset, 614 length); 615 error = EINVAL; 616 break; 617 } 618 while (length > 0) { 619 chunk = length; 620 if (g_dev_del_max_sectors != 0 && 621 chunk > g_dev_del_max_sectors * pp->sectorsize) { 622 chunk = g_dev_del_max_sectors * pp->sectorsize; 623 if (pp->stripesize > 0) { 624 odd = (offset + chunk + 625 pp->stripeoffset) % pp->stripesize; 626 if (chunk > odd) 627 chunk -= odd; 628 } 629 } 630 error = g_delete_data(cp, offset, chunk); 631 length -= chunk; 632 offset += chunk; 633 if (error) 634 break; 635 /* 636 * Since the request size can be large, the service 637 * time can be is likewise. We make this ioctl 638 * interruptible by checking for signals for each bio. 639 */ 640 if (SIGPENDING(td)) 641 break; 642 } 643 break; 644 case DIOCGIDENT: 645 error = g_io_getattr("GEOM::ident", cp, &i, data); 646 break; 647 case DIOCGPROVIDERNAME: 648 strlcpy(data, pp->name, i); 649 break; 650 case DIOCGSTRIPESIZE: 651 *(off_t *)data = pp->stripesize; 652 break; 653 case DIOCGSTRIPEOFFSET: 654 *(off_t *)data = pp->stripeoffset; 655 break; 656 case DIOCGPHYSPATH: 657 error = g_io_getattr("GEOM::physpath", cp, &i, data); 658 if (error == 0 && *(char *)data == '\0') 659 error = ENOENT; 660 break; 661 case DIOCGATTR: { 662 struct diocgattr_arg *arg = (struct diocgattr_arg *)data; 663 664 if (arg->len > sizeof(arg->value)) { 665 error = EINVAL; 666 break; 667 } 668 error = g_io_getattr(arg->name, cp, &arg->len, &arg->value); 669 break; 670 } 671 case DIOCZONECMD: { 672 struct disk_zone_args *zone_args =(struct disk_zone_args *)data; 673 struct disk_zone_rep_entry *new_entries, *old_entries; 674 struct disk_zone_report *rep; 675 size_t alloc_size; 676 677 old_entries = NULL; 678 new_entries = NULL; 679 rep = NULL; 680 alloc_size = 0; 681 682 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES) { 683 rep = &zone_args->zone_params.report; 684 #define MAXENTRIES (maxphys / sizeof(struct disk_zone_rep_entry)) 685 if (rep->entries_allocated > MAXENTRIES) 686 rep->entries_allocated = MAXENTRIES; 687 alloc_size = rep->entries_allocated * 688 sizeof(struct disk_zone_rep_entry); 689 if (alloc_size != 0) 690 new_entries = g_malloc(alloc_size, 691 M_WAITOK | M_ZERO); 692 old_entries = rep->entries; 693 rep->entries = new_entries; 694 } 695 error = g_io_zonecmd(zone_args, cp); 696 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES && 697 alloc_size != 0 && error == 0) 698 error = copyout(new_entries, old_entries, alloc_size); 699 if (old_entries != NULL && rep != NULL) 700 rep->entries = old_entries; 701 g_free(new_entries); 702 break; 703 } 704 default: 705 if (pp->geom->ioctl != NULL) { 706 error = pp->geom->ioctl(pp, cmd, data, fflag, td); 707 } else { 708 error = ENOIOCTL; 709 } 710 } 711 712 return (error); 713 } 714 715 static void 716 g_dev_done(struct bio *bp2) 717 { 718 struct g_consumer *cp; 719 struct g_dev_softc *sc; 720 struct bio *bp; 721 int active; 722 723 cp = bp2->bio_from; 724 sc = cp->private; 725 bp = bp2->bio_parent; 726 bp->bio_error = bp2->bio_error; 727 bp->bio_completed = bp2->bio_completed; 728 bp->bio_resid = bp->bio_length - bp2->bio_completed; 729 if (bp2->bio_cmd == BIO_ZONE) 730 bcopy(&bp2->bio_zone, &bp->bio_zone, sizeof(bp->bio_zone)); 731 732 if (bp2->bio_error != 0) { 733 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 734 bp2, bp2->bio_error); 735 bp->bio_flags |= BIO_ERROR; 736 } else { 737 if (bp->bio_cmd == BIO_READ) 738 KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, NOTE_READ); 739 if (bp->bio_cmd == BIO_WRITE) 740 KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, NOTE_WRITE); 741 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 742 bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed); 743 } 744 g_destroy_bio(bp2); 745 active = atomic_fetchadd_int(&sc->sc_active, -1) - 1; 746 if ((active & SC_A_ACTIVE) == 0) { 747 if ((active & SC_A_OPEN) == 0) 748 wakeup(&sc->sc_active); 749 if (active & SC_A_DESTROY) 750 g_post_event(g_dev_destroy, cp, M_NOWAIT, NULL); 751 } 752 biodone(bp); 753 } 754 755 static void 756 g_dev_strategy(struct bio *bp) 757 { 758 struct g_consumer *cp; 759 struct bio *bp2; 760 struct cdev *dev; 761 struct g_dev_softc *sc; 762 763 KASSERT(bp->bio_cmd == BIO_READ || 764 bp->bio_cmd == BIO_WRITE || 765 bp->bio_cmd == BIO_DELETE || 766 bp->bio_cmd == BIO_FLUSH || 767 bp->bio_cmd == BIO_ZONE, 768 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 769 dev = bp->bio_dev; 770 cp = dev->si_drv2; 771 KASSERT(cp->acr || cp->acw, 772 ("Consumer with zero access count in g_dev_strategy")); 773 biotrack(bp, __func__); 774 #ifdef INVARIANTS 775 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 776 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 777 bp->bio_resid = bp->bio_bcount; 778 biofinish(bp, NULL, EINVAL); 779 return; 780 } 781 #endif 782 sc = dev->si_drv1; 783 KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy")); 784 atomic_add_int(&sc->sc_active, 1); 785 786 for (;;) { 787 /* 788 * XXX: This is not an ideal solution, but I believe it to 789 * XXX: deadlock safely, all things considered. 790 */ 791 bp2 = g_clone_bio(bp); 792 if (bp2 != NULL) 793 break; 794 pause("gdstrat", hz / 10); 795 } 796 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 797 bp2->bio_done = g_dev_done; 798 g_trace(G_T_BIO, 799 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 800 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 801 bp2->bio_data, bp2->bio_cmd); 802 g_io_request(bp2, cp); 803 KASSERT(cp->acr || cp->acw, 804 ("g_dev_strategy raced with g_dev_close and lost")); 805 806 } 807 808 /* 809 * g_dev_callback() 810 * 811 * Called by devfs when asynchronous device destruction is completed. 812 * - Mark that we have no attached device any more. 813 * - If there are no outstanding requests, schedule geom destruction. 814 * Otherwise destruction will be scheduled later by g_dev_done(). 815 */ 816 817 static void 818 g_dev_callback(void *arg) 819 { 820 struct g_consumer *cp; 821 struct g_dev_softc *sc; 822 int active; 823 824 cp = arg; 825 sc = cp->private; 826 g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name); 827 828 sc->sc_dev = NULL; 829 sc->sc_alias = NULL; 830 active = atomic_fetchadd_int(&sc->sc_active, SC_A_DESTROY); 831 if ((active & SC_A_ACTIVE) == 0) 832 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 833 } 834 835 /* 836 * g_dev_orphan() 837 * 838 * Called from below when the provider orphaned us. 839 * - Clear any dump settings. 840 * - Request asynchronous device destruction to prevent any more requests 841 * from coming in. The provider is already marked with an error, so 842 * anything which comes in the interim will be returned immediately. 843 */ 844 845 static void 846 g_dev_orphan(struct g_consumer *cp) 847 { 848 struct cdev *dev; 849 struct g_dev_softc *sc; 850 851 g_topology_assert(); 852 sc = cp->private; 853 dev = sc->sc_dev; 854 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name); 855 856 /* Reset any dump-area set on this device */ 857 if (dev->si_flags & SI_DUMPDEV) { 858 struct diocskerneldump_arg kda; 859 860 bzero(&kda, sizeof(kda)); 861 kda.kda_index = KDA_REMOVE_DEV; 862 (void)dumper_remove(devtoname(dev), &kda); 863 } 864 865 /* Destroy the struct cdev *so we get no more requests */ 866 delist_dev(dev); 867 destroy_dev_sched_cb(dev, g_dev_callback, cp); 868 } 869 870 static void 871 gdev_filter_detach(struct knote *kn) 872 { 873 struct g_dev_softc *sc; 874 875 sc = kn->kn_hook; 876 877 knlist_remove(&sc->sc_selinfo.si_note, kn, 0); 878 } 879 880 static int 881 gdev_filter_vnode(struct knote *kn, long hint) 882 { 883 kn->kn_fflags |= kn->kn_sfflags & hint; 884 885 return (kn->kn_fflags != 0); 886 } 887 888 static int 889 g_dev_kqfilter(struct cdev *dev, struct knote *kn) 890 { 891 struct g_dev_softc *sc; 892 893 sc = dev->si_drv1; 894 895 if (kn->kn_filter != EVFILT_VNODE) 896 return (EINVAL); 897 898 #define SUPPORTED_EVENTS (NOTE_ATTRIB | NOTE_OPEN | NOTE_CLOSE | \ 899 NOTE_CLOSE_WRITE | NOTE_READ | NOTE_WRITE) 900 if (kn->kn_sfflags & ~SUPPORTED_EVENTS) 901 return (EOPNOTSUPP); 902 903 kn->kn_fop = &gdev_filterops_vnode; 904 kn->kn_hook = sc; 905 knlist_add(&sc->sc_selinfo.si_note, kn, 0); 906 907 return (0); 908 } 909 910 DECLARE_GEOM_CLASS(g_dev_class, g_dev); 911