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 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/malloc.h> 42 #include <sys/kernel.h> 43 #include <sys/conf.h> 44 #include <sys/ctype.h> 45 #include <sys/bio.h> 46 #include <sys/devctl.h> 47 #include <sys/lock.h> 48 #include <sys/mutex.h> 49 #include <sys/proc.h> 50 #include <sys/errno.h> 51 #include <sys/time.h> 52 #include <sys/disk.h> 53 #include <sys/fcntl.h> 54 #include <sys/limits.h> 55 #include <sys/selinfo.h> 56 #include <sys/sysctl.h> 57 #include <geom/geom.h> 58 #include <geom/geom_int.h> 59 #include <machine/stdarg.h> 60 61 struct g_dev_softc { 62 struct mtx sc_mtx; 63 struct cdev *sc_dev; 64 struct cdev *sc_alias; 65 int sc_open; 66 u_int sc_active; 67 struct selinfo sc_selinfo; 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 static d_kqfilter_t g_dev_kqfilter; 78 79 static void gdev_filter_detach(struct knote *kn); 80 static int gdev_filter_vnode(struct knote *kn, long hint); 81 82 static struct filterops gdev_filterops_vnode = { 83 .f_isfd = 1, 84 .f_detach = gdev_filter_detach, 85 .f_event = gdev_filter_vnode, 86 }; 87 88 static struct cdevsw g_dev_cdevsw = { 89 .d_version = D_VERSION, 90 .d_open = g_dev_open, 91 .d_close = g_dev_close, 92 .d_read = physread, 93 .d_write = physwrite, 94 .d_ioctl = g_dev_ioctl, 95 .d_strategy = g_dev_strategy, 96 .d_name = "g_dev", 97 .d_flags = D_DISK | D_TRACKCLOSE, 98 .d_kqfilter = g_dev_kqfilter, 99 }; 100 101 static g_init_t g_dev_init; 102 static g_fini_t g_dev_fini; 103 static g_taste_t g_dev_taste; 104 static g_orphan_t g_dev_orphan; 105 static g_attrchanged_t g_dev_attrchanged; 106 static g_resize_t g_dev_resize; 107 108 static struct g_class g_dev_class = { 109 .name = "DEV", 110 .version = G_VERSION, 111 .init = g_dev_init, 112 .fini = g_dev_fini, 113 .taste = g_dev_taste, 114 .orphan = g_dev_orphan, 115 .attrchanged = g_dev_attrchanged, 116 .resize = g_dev_resize 117 }; 118 119 /* 120 * We target 262144 (8 x 32768) sectors by default as this significantly 121 * increases the throughput on commonly used SSD's with a marginal 122 * increase in non-interruptible request latency. 123 */ 124 static uint64_t g_dev_del_max_sectors = 262144; 125 SYSCTL_DECL(_kern_geom); 126 SYSCTL_NODE(_kern_geom, OID_AUTO, dev, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 127 "GEOM_DEV stuff"); 128 SYSCTL_QUAD(_kern_geom_dev, OID_AUTO, delete_max_sectors, CTLFLAG_RW, 129 &g_dev_del_max_sectors, 0, "Maximum number of sectors in a single " 130 "delete request sent to the provider. Larger requests are chunked " 131 "so they can be interrupted. (0 = disable chunking)"); 132 133 static char *dumpdev = NULL; 134 static void 135 g_dev_init(struct g_class *mp) 136 { 137 138 dumpdev = kern_getenv("dumpdev"); 139 } 140 141 static void 142 g_dev_fini(struct g_class *mp) 143 { 144 145 freeenv(dumpdev); 146 dumpdev = NULL; 147 } 148 149 static int 150 g_dev_setdumpdev(struct cdev *dev, struct diocskerneldump_arg *kda) 151 { 152 struct g_kerneldump kd; 153 struct g_consumer *cp; 154 int error, len; 155 156 MPASS(dev != NULL && kda != NULL); 157 MPASS(kda->kda_index != KDA_REMOVE); 158 159 cp = dev->si_drv2; 160 len = sizeof(kd); 161 memset(&kd, 0, len); 162 kd.offset = 0; 163 kd.length = OFF_MAX; 164 error = g_io_getattr("GEOM::kerneldump", cp, &len, &kd); 165 if (error != 0) 166 return (error); 167 168 error = dumper_insert(&kd.di, devtoname(dev), kda); 169 if (error == 0) 170 dev->si_flags |= SI_DUMPDEV; 171 172 return (error); 173 } 174 175 static int 176 init_dumpdev(struct cdev *dev) 177 { 178 struct diocskerneldump_arg kda; 179 struct g_consumer *cp; 180 const char *devprefix = _PATH_DEV, *devname; 181 int error; 182 size_t len; 183 184 bzero(&kda, sizeof(kda)); 185 kda.kda_index = KDA_APPEND; 186 187 if (dumpdev == NULL) 188 return (0); 189 190 len = strlen(devprefix); 191 devname = devtoname(dev); 192 if (strcmp(devname, dumpdev) != 0 && 193 (strncmp(dumpdev, devprefix, len) != 0 || 194 strcmp(devname, dumpdev + len) != 0)) 195 return (0); 196 197 cp = (struct g_consumer *)dev->si_drv2; 198 error = g_access(cp, 1, 0, 0); 199 if (error != 0) 200 return (error); 201 202 error = g_dev_setdumpdev(dev, &kda); 203 if (error == 0) { 204 freeenv(dumpdev); 205 dumpdev = NULL; 206 } 207 208 (void)g_access(cp, -1, 0, 0); 209 210 return (error); 211 } 212 213 static void 214 g_dev_destroy(void *arg, int flags __unused) 215 { 216 struct g_consumer *cp; 217 struct g_geom *gp; 218 struct g_dev_softc *sc; 219 char buf[SPECNAMELEN + 6]; 220 221 g_topology_assert(); 222 cp = arg; 223 gp = cp->geom; 224 sc = cp->private; 225 g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name); 226 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 227 devctl_notify("GEOM", "DEV", "DESTROY", buf); 228 knlist_clear(&sc->sc_selinfo.si_note, 0); 229 knlist_destroy(&sc->sc_selinfo.si_note); 230 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 231 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 232 g_detach(cp); 233 g_destroy_consumer(cp); 234 g_destroy_geom(gp); 235 mtx_destroy(&sc->sc_mtx); 236 g_free(sc); 237 } 238 239 void 240 g_dev_print(void) 241 { 242 struct g_geom *gp; 243 char const *p = ""; 244 245 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 246 printf("%s%s", p, gp->name); 247 p = " "; 248 } 249 printf("\n"); 250 } 251 252 static void 253 g_dev_set_physpath(struct g_consumer *cp) 254 { 255 struct g_dev_softc *sc; 256 char *physpath; 257 int error, physpath_len; 258 259 if (g_access(cp, 1, 0, 0) != 0) 260 return; 261 262 sc = cp->private; 263 physpath_len = MAXPATHLEN; 264 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO); 265 error = g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath); 266 g_access(cp, -1, 0, 0); 267 if (error == 0 && strlen(physpath) != 0) { 268 struct cdev *dev, *old_alias_dev; 269 struct cdev **alias_devp; 270 271 dev = sc->sc_dev; 272 old_alias_dev = sc->sc_alias; 273 alias_devp = (struct cdev **)&sc->sc_alias; 274 make_dev_physpath_alias(MAKEDEV_WAITOK | MAKEDEV_CHECKNAME, 275 alias_devp, dev, old_alias_dev, physpath); 276 } else if (sc->sc_alias) { 277 destroy_dev((struct cdev *)sc->sc_alias); 278 sc->sc_alias = NULL; 279 } 280 g_free(physpath); 281 } 282 283 static void 284 g_dev_set_media(struct g_consumer *cp) 285 { 286 struct g_dev_softc *sc; 287 struct cdev *dev; 288 char buf[SPECNAMELEN + 6]; 289 290 sc = cp->private; 291 dev = sc->sc_dev; 292 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 293 devctl_notify("DEVFS", "CDEV", "MEDIACHANGE", buf); 294 devctl_notify("GEOM", "DEV", "MEDIACHANGE", buf); 295 dev = sc->sc_alias; 296 if (dev != NULL) { 297 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 298 devctl_notify("DEVFS", "CDEV", "MEDIACHANGE", buf); 299 devctl_notify("GEOM", "DEV", "MEDIACHANGE", buf); 300 } 301 } 302 303 static void 304 g_dev_attrchanged(struct g_consumer *cp, const char *attr) 305 { 306 307 if (strcmp(attr, "GEOM::media") == 0) { 308 g_dev_set_media(cp); 309 return; 310 } 311 312 if (strcmp(attr, "GEOM::physpath") == 0) { 313 g_dev_set_physpath(cp); 314 return; 315 } 316 } 317 318 static void 319 g_dev_resize(struct g_consumer *cp) 320 { 321 struct g_dev_softc *sc; 322 char buf[SPECNAMELEN + 6]; 323 324 sc = cp->private; 325 KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, NOTE_ATTRIB); 326 327 snprintf(buf, sizeof(buf), "cdev=%s", cp->provider->name); 328 devctl_notify("GEOM", "DEV", "SIZECHANGE", buf); 329 } 330 331 struct g_provider * 332 g_dev_getprovider(struct cdev *dev) 333 { 334 struct g_consumer *cp; 335 336 g_topology_assert(); 337 if (dev == NULL) 338 return (NULL); 339 if (dev->si_devsw != &g_dev_cdevsw) 340 return (NULL); 341 cp = dev->si_drv2; 342 return (cp->provider); 343 } 344 345 static struct g_geom * 346 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 347 { 348 struct g_geom *gp; 349 struct g_geom_alias *gap; 350 struct g_consumer *cp; 351 struct g_dev_softc *sc; 352 int error; 353 struct cdev *dev, *adev; 354 char buf[SPECNAMELEN + 6]; 355 struct make_dev_args args; 356 357 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 358 g_topology_assert(); 359 gp = g_new_geomf(mp, "%s", pp->name); 360 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 361 mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF); 362 cp = g_new_consumer(gp); 363 cp->private = sc; 364 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 365 error = g_attach(cp, pp); 366 if (error != 0) { 367 printf("%s: g_dev_taste(%s) failed to g_attach, error=%d\n", 368 __func__, pp->name, error); 369 g_destroy_consumer(cp); 370 g_destroy_geom(gp); 371 mtx_destroy(&sc->sc_mtx); 372 g_free(sc); 373 return (NULL); 374 } 375 make_dev_args_init(&args); 376 args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK; 377 args.mda_devsw = &g_dev_cdevsw; 378 args.mda_cr = NULL; 379 args.mda_uid = UID_ROOT; 380 args.mda_gid = GID_OPERATOR; 381 args.mda_mode = 0640; 382 args.mda_si_drv1 = sc; 383 args.mda_si_drv2 = cp; 384 error = make_dev_s(&args, &sc->sc_dev, "%s", gp->name); 385 if (error != 0) { 386 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n", 387 __func__, gp->name, error); 388 g_detach(cp); 389 g_destroy_consumer(cp); 390 g_destroy_geom(gp); 391 mtx_destroy(&sc->sc_mtx); 392 g_free(sc); 393 return (NULL); 394 } 395 dev = sc->sc_dev; 396 dev->si_flags |= SI_UNMAPPED; 397 dev->si_iosize_max = maxphys; 398 knlist_init_mtx(&sc->sc_selinfo.si_note, &sc->sc_mtx); 399 error = init_dumpdev(dev); 400 if (error != 0) 401 printf("%s: init_dumpdev() failed (gp->name=%s, error=%d)\n", 402 __func__, gp->name, error); 403 404 g_dev_attrchanged(cp, "GEOM::physpath"); 405 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 406 devctl_notify("GEOM", "DEV", "CREATE", buf); 407 /* 408 * Now add all the aliases for this drive 409 */ 410 LIST_FOREACH(gap, &pp->aliases, ga_next) { 411 error = make_dev_alias_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &adev, dev, 412 "%s", gap->ga_alias); 413 if (error) { 414 printf("%s: make_dev_alias_p() failed (name=%s, error=%d)\n", 415 __func__, gap->ga_alias, error); 416 continue; 417 } 418 snprintf(buf, sizeof(buf), "cdev=%s", gap->ga_alias); 419 devctl_notify("GEOM", "DEV", "CREATE", buf); 420 } 421 422 return (gp); 423 } 424 425 static int 426 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 427 { 428 struct g_consumer *cp; 429 struct g_dev_softc *sc; 430 int error, r, w, e; 431 432 cp = dev->si_drv2; 433 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 434 cp->geom->name, flags, fmt, td); 435 436 r = flags & FREAD ? 1 : 0; 437 w = flags & FWRITE ? 1 : 0; 438 #ifdef notyet 439 e = flags & O_EXCL ? 1 : 0; 440 #else 441 e = 0; 442 #endif 443 444 /* 445 * This happens on attempt to open a device node with O_EXEC. 446 */ 447 if (r + w + e == 0) 448 return (EINVAL); 449 450 if (w) { 451 /* 452 * When running in very secure mode, do not allow 453 * opens for writing of any disks. 454 */ 455 error = securelevel_ge(td->td_ucred, 2); 456 if (error) 457 return (error); 458 } 459 g_topology_lock(); 460 error = g_access(cp, r, w, e); 461 g_topology_unlock(); 462 if (error == 0) { 463 sc = dev->si_drv1; 464 mtx_lock(&sc->sc_mtx); 465 if (sc->sc_open == 0 && (sc->sc_active & SC_A_ACTIVE) != 0) 466 wakeup(&sc->sc_active); 467 sc->sc_open += r + w + e; 468 if (sc->sc_open == 0) 469 atomic_clear_int(&sc->sc_active, SC_A_OPEN); 470 else 471 atomic_set_int(&sc->sc_active, SC_A_OPEN); 472 KNOTE_LOCKED(&sc->sc_selinfo.si_note, NOTE_OPEN); 473 mtx_unlock(&sc->sc_mtx); 474 } 475 return (error); 476 } 477 478 static int 479 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 480 { 481 struct g_consumer *cp; 482 struct g_dev_softc *sc; 483 int error, r, w, e; 484 485 cp = dev->si_drv2; 486 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 487 cp->geom->name, flags, fmt, td); 488 489 r = flags & FREAD ? -1 : 0; 490 w = flags & FWRITE ? -1 : 0; 491 #ifdef notyet 492 e = flags & O_EXCL ? -1 : 0; 493 #else 494 e = 0; 495 #endif 496 497 /* 498 * The vgonel(9) - caused by eg. forced unmount of devfs - calls 499 * VOP_CLOSE(9) on devfs vnode without any FREAD or FWRITE flags, 500 * which would result in zero deltas, which in turn would cause 501 * panic in g_access(9). 502 * 503 * Note that we cannot zero the counters (ie. do "r = cp->acr" 504 * etc) instead, because the consumer might be opened in another 505 * devfs instance. 506 */ 507 if (r + w + e == 0) 508 return (EINVAL); 509 510 sc = dev->si_drv1; 511 mtx_lock(&sc->sc_mtx); 512 sc->sc_open += r + w + e; 513 if (sc->sc_open == 0) 514 atomic_clear_int(&sc->sc_active, SC_A_OPEN); 515 else 516 atomic_set_int(&sc->sc_active, SC_A_OPEN); 517 while (sc->sc_open == 0 && (sc->sc_active & SC_A_ACTIVE) != 0) 518 msleep(&sc->sc_active, &sc->sc_mtx, 0, "g_dev_close", hz / 10); 519 KNOTE_LOCKED(&sc->sc_selinfo.si_note, NOTE_CLOSE | (w ? NOTE_CLOSE_WRITE : 0)); 520 mtx_unlock(&sc->sc_mtx); 521 g_topology_lock(); 522 error = g_access(cp, r, w, e); 523 g_topology_unlock(); 524 return (error); 525 } 526 527 static int 528 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 529 { 530 struct g_consumer *cp; 531 struct g_provider *pp; 532 off_t offset, length, chunk, odd; 533 int i, error; 534 535 cp = dev->si_drv2; 536 pp = cp->provider; 537 538 /* If consumer or provider is dying, don't disturb. */ 539 if (cp->flags & G_CF_ORPHAN) 540 return (ENXIO); 541 if (pp->error) 542 return (pp->error); 543 544 error = 0; 545 KASSERT(cp->acr || cp->acw, 546 ("Consumer with zero access count in g_dev_ioctl")); 547 548 i = IOCPARM_LEN(cmd); 549 switch (cmd) { 550 case DIOCGSECTORSIZE: 551 *(u_int *)data = pp->sectorsize; 552 if (*(u_int *)data == 0) 553 error = ENOENT; 554 break; 555 case DIOCGMEDIASIZE: 556 *(off_t *)data = pp->mediasize; 557 if (*(off_t *)data == 0) 558 error = ENOENT; 559 break; 560 case DIOCGFWSECTORS: 561 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 562 if (error == 0 && *(u_int *)data == 0) 563 error = ENOENT; 564 break; 565 case DIOCGFWHEADS: 566 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 567 if (error == 0 && *(u_int *)data == 0) 568 error = ENOENT; 569 break; 570 case DIOCSKERNELDUMP: 571 { 572 struct diocskerneldump_arg *kda; 573 uint8_t *encryptedkey; 574 575 kda = (struct diocskerneldump_arg *)data; 576 if (kda->kda_index == KDA_REMOVE_ALL || 577 kda->kda_index == KDA_REMOVE_DEV || 578 kda->kda_index == KDA_REMOVE) { 579 error = dumper_remove(devtoname(dev), kda); 580 explicit_bzero(kda, sizeof(*kda)); 581 break; 582 } 583 584 if (kda->kda_encryption != KERNELDUMP_ENC_NONE) { 585 if (kda->kda_encryptedkeysize == 0 || 586 kda->kda_encryptedkeysize > 587 KERNELDUMP_ENCKEY_MAX_SIZE) { 588 explicit_bzero(kda, sizeof(*kda)); 589 return (EINVAL); 590 } 591 encryptedkey = malloc(kda->kda_encryptedkeysize, M_TEMP, 592 M_WAITOK); 593 error = copyin(kda->kda_encryptedkey, encryptedkey, 594 kda->kda_encryptedkeysize); 595 } else { 596 encryptedkey = NULL; 597 } 598 if (error == 0) { 599 kda->kda_encryptedkey = encryptedkey; 600 error = g_dev_setdumpdev(dev, kda); 601 } 602 zfree(encryptedkey, M_TEMP); 603 explicit_bzero(kda, sizeof(*kda)); 604 break; 605 } 606 case DIOCGFLUSH: 607 error = g_io_flush(cp); 608 break; 609 case DIOCGDELETE: 610 offset = ((off_t *)data)[0]; 611 length = ((off_t *)data)[1]; 612 if ((offset % pp->sectorsize) != 0 || 613 (length % pp->sectorsize) != 0 || length <= 0) { 614 printf("%s: offset=%jd length=%jd\n", __func__, offset, 615 length); 616 error = EINVAL; 617 break; 618 } 619 while (length > 0) { 620 chunk = length; 621 if (g_dev_del_max_sectors != 0 && 622 chunk > g_dev_del_max_sectors * pp->sectorsize) { 623 chunk = g_dev_del_max_sectors * pp->sectorsize; 624 if (pp->stripesize > 0) { 625 odd = (offset + chunk + 626 pp->stripeoffset) % pp->stripesize; 627 if (chunk > odd) 628 chunk -= odd; 629 } 630 } 631 error = g_delete_data(cp, offset, chunk); 632 length -= chunk; 633 offset += chunk; 634 if (error) 635 break; 636 /* 637 * Since the request size can be large, the service 638 * time can be is likewise. We make this ioctl 639 * interruptible by checking for signals for each bio. 640 */ 641 if (SIGPENDING(td)) 642 break; 643 } 644 break; 645 case DIOCGIDENT: 646 error = g_io_getattr("GEOM::ident", cp, &i, data); 647 break; 648 case DIOCGPROVIDERNAME: 649 strlcpy(data, pp->name, i); 650 break; 651 case DIOCGSTRIPESIZE: 652 *(off_t *)data = pp->stripesize; 653 break; 654 case DIOCGSTRIPEOFFSET: 655 *(off_t *)data = pp->stripeoffset; 656 break; 657 case DIOCGPHYSPATH: 658 error = g_io_getattr("GEOM::physpath", cp, &i, data); 659 if (error == 0 && *(char *)data == '\0') 660 error = ENOENT; 661 break; 662 case DIOCGATTR: { 663 struct diocgattr_arg *arg = (struct diocgattr_arg *)data; 664 665 if (arg->len > sizeof(arg->value)) { 666 error = EINVAL; 667 break; 668 } 669 error = g_io_getattr(arg->name, cp, &arg->len, &arg->value); 670 break; 671 } 672 case DIOCZONECMD: { 673 struct disk_zone_args *zone_args =(struct disk_zone_args *)data; 674 struct disk_zone_rep_entry *new_entries, *old_entries; 675 struct disk_zone_report *rep; 676 size_t alloc_size; 677 678 old_entries = NULL; 679 new_entries = NULL; 680 rep = NULL; 681 alloc_size = 0; 682 683 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES) { 684 rep = &zone_args->zone_params.report; 685 #define MAXENTRIES (maxphys / sizeof(struct disk_zone_rep_entry)) 686 if (rep->entries_allocated > MAXENTRIES) 687 rep->entries_allocated = MAXENTRIES; 688 alloc_size = rep->entries_allocated * 689 sizeof(struct disk_zone_rep_entry); 690 if (alloc_size != 0) 691 new_entries = g_malloc(alloc_size, 692 M_WAITOK | M_ZERO); 693 old_entries = rep->entries; 694 rep->entries = new_entries; 695 } 696 error = g_io_zonecmd(zone_args, cp); 697 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES && 698 alloc_size != 0 && error == 0) 699 error = copyout(new_entries, old_entries, alloc_size); 700 if (old_entries != NULL && rep != NULL) 701 rep->entries = old_entries; 702 g_free(new_entries); 703 break; 704 } 705 default: 706 if (pp->geom->ioctl != NULL) { 707 error = pp->geom->ioctl(pp, cmd, data, fflag, td); 708 } else { 709 error = ENOIOCTL; 710 } 711 } 712 713 return (error); 714 } 715 716 static void 717 g_dev_done(struct bio *bp2) 718 { 719 struct g_consumer *cp; 720 struct g_dev_softc *sc; 721 struct bio *bp; 722 int active; 723 724 cp = bp2->bio_from; 725 sc = cp->private; 726 bp = bp2->bio_parent; 727 bp->bio_error = bp2->bio_error; 728 bp->bio_completed = bp2->bio_completed; 729 bp->bio_resid = bp->bio_length - bp2->bio_completed; 730 if (bp2->bio_cmd == BIO_ZONE) 731 bcopy(&bp2->bio_zone, &bp->bio_zone, sizeof(bp->bio_zone)); 732 733 if (bp2->bio_error != 0) { 734 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 735 bp2, bp2->bio_error); 736 bp->bio_flags |= BIO_ERROR; 737 } else { 738 if (bp->bio_cmd == BIO_READ) 739 KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, NOTE_READ); 740 if (bp->bio_cmd == BIO_WRITE) 741 KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, NOTE_WRITE); 742 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 743 bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed); 744 } 745 g_destroy_bio(bp2); 746 active = atomic_fetchadd_int(&sc->sc_active, -1) - 1; 747 if ((active & SC_A_ACTIVE) == 0) { 748 if ((active & SC_A_OPEN) == 0) 749 wakeup(&sc->sc_active); 750 if (active & SC_A_DESTROY) 751 g_post_event(g_dev_destroy, cp, M_NOWAIT, NULL); 752 } 753 biodone(bp); 754 } 755 756 static void 757 g_dev_strategy(struct bio *bp) 758 { 759 struct g_consumer *cp; 760 struct bio *bp2; 761 struct cdev *dev; 762 struct g_dev_softc *sc; 763 764 KASSERT(bp->bio_cmd == BIO_READ || 765 bp->bio_cmd == BIO_WRITE || 766 bp->bio_cmd == BIO_DELETE || 767 bp->bio_cmd == BIO_FLUSH || 768 bp->bio_cmd == BIO_ZONE, 769 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 770 dev = bp->bio_dev; 771 cp = dev->si_drv2; 772 KASSERT(cp->acr || cp->acw, 773 ("Consumer with zero access count in g_dev_strategy")); 774 biotrack(bp, __func__); 775 #ifdef INVARIANTS 776 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 777 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 778 bp->bio_resid = bp->bio_bcount; 779 biofinish(bp, NULL, EINVAL); 780 return; 781 } 782 #endif 783 sc = dev->si_drv1; 784 KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy")); 785 atomic_add_int(&sc->sc_active, 1); 786 787 for (;;) { 788 /* 789 * XXX: This is not an ideal solution, but I believe it to 790 * XXX: deadlock safely, all things considered. 791 */ 792 bp2 = g_clone_bio(bp); 793 if (bp2 != NULL) 794 break; 795 pause("gdstrat", hz / 10); 796 } 797 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 798 bp2->bio_done = g_dev_done; 799 g_trace(G_T_BIO, 800 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 801 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 802 bp2->bio_data, bp2->bio_cmd); 803 g_io_request(bp2, cp); 804 KASSERT(cp->acr || cp->acw, 805 ("g_dev_strategy raced with g_dev_close and lost")); 806 807 } 808 809 /* 810 * g_dev_callback() 811 * 812 * Called by devfs when asynchronous device destruction is completed. 813 * - Mark that we have no attached device any more. 814 * - If there are no outstanding requests, schedule geom destruction. 815 * Otherwise destruction will be scheduled later by g_dev_done(). 816 */ 817 818 static void 819 g_dev_callback(void *arg) 820 { 821 struct g_consumer *cp; 822 struct g_dev_softc *sc; 823 int active; 824 825 cp = arg; 826 sc = cp->private; 827 g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name); 828 829 sc->sc_dev = NULL; 830 sc->sc_alias = NULL; 831 active = atomic_fetchadd_int(&sc->sc_active, SC_A_DESTROY); 832 if ((active & SC_A_ACTIVE) == 0) 833 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 834 } 835 836 /* 837 * g_dev_orphan() 838 * 839 * Called from below when the provider orphaned us. 840 * - Clear any dump settings. 841 * - Request asynchronous device destruction to prevent any more requests 842 * from coming in. The provider is already marked with an error, so 843 * anything which comes in the interim will be returned immediately. 844 */ 845 846 static void 847 g_dev_orphan(struct g_consumer *cp) 848 { 849 struct cdev *dev; 850 struct g_dev_softc *sc; 851 852 g_topology_assert(); 853 sc = cp->private; 854 dev = sc->sc_dev; 855 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name); 856 857 /* Reset any dump-area set on this device */ 858 if (dev->si_flags & SI_DUMPDEV) { 859 struct diocskerneldump_arg kda; 860 861 bzero(&kda, sizeof(kda)); 862 kda.kda_index = KDA_REMOVE_DEV; 863 (void)dumper_remove(devtoname(dev), &kda); 864 } 865 866 /* Destroy the struct cdev *so we get no more requests */ 867 delist_dev(dev); 868 destroy_dev_sched_cb(dev, g_dev_callback, cp); 869 } 870 871 static void 872 gdev_filter_detach(struct knote *kn) 873 { 874 struct g_dev_softc *sc; 875 876 sc = kn->kn_hook; 877 878 knlist_remove(&sc->sc_selinfo.si_note, kn, 0); 879 } 880 881 static int 882 gdev_filter_vnode(struct knote *kn, long hint) 883 { 884 kn->kn_fflags |= kn->kn_sfflags & hint; 885 886 return (kn->kn_fflags != 0); 887 } 888 889 static int 890 g_dev_kqfilter(struct cdev *dev, struct knote *kn) 891 { 892 struct g_dev_softc *sc; 893 894 sc = dev->si_drv1; 895 896 if (kn->kn_filter != EVFILT_VNODE) 897 return (EINVAL); 898 899 #define SUPPORTED_EVENTS (NOTE_ATTRIB | NOTE_OPEN | NOTE_CLOSE | \ 900 NOTE_CLOSE_WRITE | NOTE_READ | NOTE_WRITE) 901 if (kn->kn_sfflags & ~SUPPORTED_EVENTS) 902 return (EOPNOTSUPP); 903 904 kn->kn_fop = &gdev_filterops_vnode; 905 kn->kn_hook = sc; 906 knlist_add(&sc->sc_selinfo.si_note, kn, 0); 907 908 return (0); 909 } 910 911 DECLARE_GEOM_CLASS(g_dev_class, g_dev); 912