Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
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("$FreeBSD$"); 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/devctl.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/selinfo.h> 58 #include <sys/sysctl.h> 59 #include <geom/geom.h> 60 #include <geom/geom_int.h> 61 #include <machine/stdarg.h> 62 63 struct g_dev_softc { 64 struct mtx sc_mtx; 65 struct cdev *sc_dev; 66 struct cdev *sc_alias; 67 int sc_open; 68 u_int sc_active; 69 struct selinfo sc_selinfo; 70 #define SC_A_DESTROY (1 << 31) 71 #define SC_A_OPEN (1 << 30) 72 #define SC_A_ACTIVE (SC_A_OPEN - 1) 73 }; 74 75 static d_open_t g_dev_open; 76 static d_close_t g_dev_close; 77 static d_strategy_t g_dev_strategy; 78 static d_ioctl_t g_dev_ioctl; 79 static d_kqfilter_t g_dev_kqfilter; 80 81 static void gdev_filter_detach(struct knote *kn); 82 static int gdev_filter_vnode(struct knote *kn, long hint); 83 84 static struct filterops gdev_filterops_vnode = { 85 .f_isfd = 1, 86 .f_detach = gdev_filter_detach, 87 .f_event = gdev_filter_vnode, 88 }; 89 90 static struct cdevsw g_dev_cdevsw = { 91 .d_version = D_VERSION, 92 .d_open = g_dev_open, 93 .d_close = g_dev_close, 94 .d_read = physread, 95 .d_write = physwrite, 96 .d_ioctl = g_dev_ioctl, 97 .d_strategy = g_dev_strategy, 98 .d_name = "g_dev", 99 .d_flags = D_DISK | D_TRACKCLOSE, 100 .d_kqfilter = g_dev_kqfilter, 101 }; 102 103 static g_init_t g_dev_init; 104 static g_fini_t g_dev_fini; 105 static g_taste_t g_dev_taste; 106 static g_orphan_t g_dev_orphan; 107 static g_attrchanged_t g_dev_attrchanged; 108 static g_resize_t g_dev_resize; 109 110 static struct g_class g_dev_class = { 111 .name = "DEV", 112 .version = G_VERSION, 113 .init = g_dev_init, 114 .fini = g_dev_fini, 115 .taste = g_dev_taste, 116 .orphan = g_dev_orphan, 117 .attrchanged = g_dev_attrchanged, 118 .resize = g_dev_resize 119 }; 120 121 /* 122 * We target 262144 (8 x 32768) sectors by default as this significantly 123 * increases the throughput on commonly used SSD's with a marginal 124 * increase in non-interruptible request latency. 125 */ 126 static uint64_t g_dev_del_max_sectors = 262144; 127 SYSCTL_DECL(_kern_geom); 128 SYSCTL_NODE(_kern_geom, OID_AUTO, dev, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 129 "GEOM_DEV stuff"); 130 SYSCTL_QUAD(_kern_geom_dev, OID_AUTO, delete_max_sectors, CTLFLAG_RW, 131 &g_dev_del_max_sectors, 0, "Maximum number of sectors in a single " 132 "delete request sent to the provider. Larger requests are chunked " 133 "so they can be interrupted. (0 = disable chunking)"); 134 135 static char *dumpdev = NULL; 136 static void 137 g_dev_init(struct g_class *mp) 138 { 139 140 dumpdev = kern_getenv("dumpdev"); 141 } 142 143 static void 144 g_dev_fini(struct g_class *mp) 145 { 146 147 freeenv(dumpdev); 148 dumpdev = NULL; 149 } 150 151 static int 152 g_dev_setdumpdev(struct cdev *dev, struct diocskerneldump_arg *kda) 153 { 154 struct g_kerneldump kd; 155 struct g_consumer *cp; 156 int error, len; 157 158 MPASS(dev != NULL && kda != NULL); 159 MPASS(kda->kda_index != KDA_REMOVE); 160 161 cp = dev->si_drv2; 162 len = sizeof(kd); 163 memset(&kd, 0, len); 164 kd.offset = 0; 165 kd.length = OFF_MAX; 166 error = g_io_getattr("GEOM::kerneldump", cp, &len, &kd); 167 if (error != 0) 168 return (error); 169 170 error = dumper_insert(&kd.di, devtoname(dev), kda); 171 if (error == 0) 172 dev->si_flags |= SI_DUMPDEV; 173 174 return (error); 175 } 176 177 static int 178 init_dumpdev(struct cdev *dev) 179 { 180 struct diocskerneldump_arg kda; 181 struct g_consumer *cp; 182 const char *devprefix = _PATH_DEV, *devname; 183 int error; 184 size_t len; 185 186 bzero(&kda, sizeof(kda)); 187 kda.kda_index = KDA_APPEND; 188 189 if (dumpdev == NULL) 190 return (0); 191 192 len = strlen(devprefix); 193 devname = devtoname(dev); 194 if (strcmp(devname, dumpdev) != 0 && 195 (strncmp(dumpdev, devprefix, len) != 0 || 196 strcmp(devname, dumpdev + len) != 0)) 197 return (0); 198 199 cp = (struct g_consumer *)dev->si_drv2; 200 error = g_access(cp, 1, 0, 0); 201 if (error != 0) 202 return (error); 203 204 error = g_dev_setdumpdev(dev, &kda); 205 if (error == 0) { 206 freeenv(dumpdev); 207 dumpdev = NULL; 208 } 209 210 (void)g_access(cp, -1, 0, 0); 211 212 return (error); 213 } 214 215 static void 216 g_dev_destroy(void *arg, int flags __unused) 217 { 218 struct g_consumer *cp; 219 struct g_geom *gp; 220 struct g_dev_softc *sc; 221 char buf[SPECNAMELEN + 6]; 222 223 g_topology_assert(); 224 cp = arg; 225 gp = cp->geom; 226 sc = cp->private; 227 g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name); 228 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 229 devctl_notify("GEOM", "DEV", "DESTROY", buf); 230 knlist_clear(&sc->sc_selinfo.si_note, 0); 231 knlist_destroy(&sc->sc_selinfo.si_note); 232 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 233 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 234 g_detach(cp); 235 g_destroy_consumer(cp); 236 g_destroy_geom(gp); 237 mtx_destroy(&sc->sc_mtx); 238 g_free(sc); 239 } 240 241 void 242 g_dev_print(void) 243 { 244 struct g_geom *gp; 245 char const *p = ""; 246 247 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 248 printf("%s%s", p, gp->name); 249 p = " "; 250 } 251 printf("\n"); 252 } 253 254 static void 255 g_dev_set_physpath(struct g_consumer *cp) 256 { 257 struct g_dev_softc *sc; 258 char *physpath; 259 int error, physpath_len; 260 261 if (g_access(cp, 1, 0, 0) != 0) 262 return; 263 264 sc = cp->private; 265 physpath_len = MAXPATHLEN; 266 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO); 267 error = g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath); 268 g_access(cp, -1, 0, 0); 269 if (error == 0 && strlen(physpath) != 0) { 270 struct cdev *dev, *old_alias_dev; 271 struct cdev **alias_devp; 272 273 dev = sc->sc_dev; 274 old_alias_dev = sc->sc_alias; 275 alias_devp = (struct cdev **)&sc->sc_alias; 276 make_dev_physpath_alias(MAKEDEV_WAITOK | MAKEDEV_CHECKNAME, 277 alias_devp, dev, old_alias_dev, physpath); 278 } else if (sc->sc_alias) { 279 destroy_dev((struct cdev *)sc->sc_alias); 280 sc->sc_alias = NULL; 281 } 282 g_free(physpath); 283 } 284 285 static void 286 g_dev_set_media(struct g_consumer *cp) 287 { 288 struct g_dev_softc *sc; 289 struct cdev *dev; 290 char buf[SPECNAMELEN + 6]; 291 292 sc = cp->private; 293 dev = sc->sc_dev; 294 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 295 devctl_notify("DEVFS", "CDEV", "MEDIACHANGE", buf); 296 devctl_notify("GEOM", "DEV", "MEDIACHANGE", buf); 297 dev = sc->sc_alias; 298 if (dev != NULL) { 299 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 300 devctl_notify("DEVFS", "CDEV", "MEDIACHANGE", buf); 301 devctl_notify("GEOM", "DEV", "MEDIACHANGE", buf); 302 } 303 } 304 305 static void 306 g_dev_attrchanged(struct g_consumer *cp, const char *attr) 307 { 308 309 if (strcmp(attr, "GEOM::media") == 0) { 310 g_dev_set_media(cp); 311 return; 312 } 313 314 if (strcmp(attr, "GEOM::physpath") == 0) { 315 g_dev_set_physpath(cp); 316 return; 317 } 318 } 319 320 static void 321 g_dev_resize(struct g_consumer *cp) 322 { 323 struct g_dev_softc *sc; 324 char buf[SPECNAMELEN + 6]; 325 326 sc = cp->private; 327 KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, NOTE_ATTRIB); 328 329 snprintf(buf, sizeof(buf), "cdev=%s", cp->provider->name); 330 devctl_notify("GEOM", "DEV", "SIZECHANGE", buf); 331 } 332 333 struct g_provider * 334 g_dev_getprovider(struct cdev *dev) 335 { 336 struct g_consumer *cp; 337 338 g_topology_assert(); 339 if (dev == NULL) 340 return (NULL); 341 if (dev->si_devsw != &g_dev_cdevsw) 342 return (NULL); 343 cp = dev->si_drv2; 344 return (cp->provider); 345 } 346 347 static struct g_geom * 348 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 349 { 350 struct g_geom *gp; 351 struct g_geom_alias *gap; 352 struct g_consumer *cp; 353 struct g_dev_softc *sc; 354 int error; 355 struct cdev *dev, *adev; 356 char buf[SPECNAMELEN + 6]; 357 struct make_dev_args args; 358 359 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 360 g_topology_assert(); 361 gp = g_new_geomf(mp, "%s", pp->name); 362 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 363 mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF); 364 cp = g_new_consumer(gp); 365 cp->private = sc; 366 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 367 error = g_attach(cp, pp); 368 if (error != 0) { 369 printf("%s: g_dev_taste(%s) failed to g_attach, error=%d\n", 370 __func__, pp->name, error); 371 g_destroy_consumer(cp); 372 g_destroy_geom(gp); 373 mtx_destroy(&sc->sc_mtx); 374 g_free(sc); 375 return (NULL); 376 } 377 make_dev_args_init(&args); 378 args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK; 379 args.mda_devsw = &g_dev_cdevsw; 380 args.mda_cr = NULL; 381 args.mda_uid = UID_ROOT; 382 args.mda_gid = GID_OPERATOR; 383 args.mda_mode = 0640; 384 args.mda_si_drv1 = sc; 385 args.mda_si_drv2 = cp; 386 error = make_dev_s(&args, &sc->sc_dev, "%s", gp->name); 387 if (error != 0) { 388 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n", 389 __func__, gp->name, error); 390 g_detach(cp); 391 g_destroy_consumer(cp); 392 g_destroy_geom(gp); 393 mtx_destroy(&sc->sc_mtx); 394 g_free(sc); 395 return (NULL); 396 } 397 dev = sc->sc_dev; 398 dev->si_flags |= SI_UNMAPPED; 399 dev->si_iosize_max = maxphys; 400 knlist_init_mtx(&sc->sc_selinfo.si_note, &sc->sc_mtx); 401 error = init_dumpdev(dev); 402 if (error != 0) 403 printf("%s: init_dumpdev() failed (gp->name=%s, error=%d)\n", 404 __func__, gp->name, error); 405 406 g_dev_attrchanged(cp, "GEOM::physpath"); 407 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 408 devctl_notify("GEOM", "DEV", "CREATE", buf); 409 /* 410 * Now add all the aliases for this drive 411 */ 412 LIST_FOREACH(gap, &pp->aliases, ga_next) { 413 error = make_dev_alias_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &adev, dev, 414 "%s", gap->ga_alias); 415 if (error) { 416 printf("%s: make_dev_alias_p() failed (name=%s, error=%d)\n", 417 __func__, gap->ga_alias, error); 418 continue; 419 } 420 snprintf(buf, sizeof(buf), "cdev=%s", gap->ga_alias); 421 devctl_notify("GEOM", "DEV", "CREATE", buf); 422 } 423 424 return (gp); 425 } 426 427 static int 428 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 429 { 430 struct g_consumer *cp; 431 struct g_dev_softc *sc; 432 int error, r, w, e; 433 434 cp = dev->si_drv2; 435 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 436 cp->geom->name, flags, fmt, td); 437 438 r = flags & FREAD ? 1 : 0; 439 w = flags & FWRITE ? 1 : 0; 440 #ifdef notyet 441 e = flags & O_EXCL ? 1 : 0; 442 #else 443 e = 0; 444 #endif 445 446 /* 447 * This happens on attempt to open a device node with O_EXEC. 448 */ 449 if (r + w + e == 0) 450 return (EINVAL); 451 452 if (w) { 453 /* 454 * When running in very secure mode, do not allow 455 * opens for writing of any disks. 456 */ 457 error = securelevel_ge(td->td_ucred, 2); 458 if (error) 459 return (error); 460 } 461 g_topology_lock(); 462 error = g_access(cp, r, w, e); 463 g_topology_unlock(); 464 if (error == 0) { 465 sc = dev->si_drv1; 466 mtx_lock(&sc->sc_mtx); 467 if (sc->sc_open == 0 && (sc->sc_active & SC_A_ACTIVE) != 0) 468 wakeup(&sc->sc_active); 469 sc->sc_open += r + w + e; 470 if (sc->sc_open == 0) 471 atomic_clear_int(&sc->sc_active, SC_A_OPEN); 472 else 473 atomic_set_int(&sc->sc_active, SC_A_OPEN); 474 KNOTE_LOCKED(&sc->sc_selinfo.si_note, NOTE_OPEN); 475 mtx_unlock(&sc->sc_mtx); 476 } 477 return (error); 478 } 479 480 static int 481 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 482 { 483 struct g_consumer *cp; 484 struct g_dev_softc *sc; 485 int error, r, w, e; 486 487 cp = dev->si_drv2; 488 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 489 cp->geom->name, flags, fmt, td); 490 491 r = flags & FREAD ? -1 : 0; 492 w = flags & FWRITE ? -1 : 0; 493 #ifdef notyet 494 e = flags & O_EXCL ? -1 : 0; 495 #else 496 e = 0; 497 #endif 498 499 /* 500 * The vgonel(9) - caused by eg. forced unmount of devfs - calls 501 * VOP_CLOSE(9) on devfs vnode without any FREAD or FWRITE flags, 502 * which would result in zero deltas, which in turn would cause 503 * panic in g_access(9). 504 * 505 * Note that we cannot zero the counters (ie. do "r = cp->acr" 506 * etc) instead, because the consumer might be opened in another 507 * devfs instance. 508 */ 509 if (r + w + e == 0) 510 return (EINVAL); 511 512 sc = dev->si_drv1; 513 mtx_lock(&sc->sc_mtx); 514 sc->sc_open += r + w + e; 515 if (sc->sc_open == 0) 516 atomic_clear_int(&sc->sc_active, SC_A_OPEN); 517 else 518 atomic_set_int(&sc->sc_active, SC_A_OPEN); 519 while (sc->sc_open == 0 && (sc->sc_active & SC_A_ACTIVE) != 0) 520 msleep(&sc->sc_active, &sc->sc_mtx, 0, "g_dev_close", hz / 10); 521 KNOTE_LOCKED(&sc->sc_selinfo.si_note, NOTE_CLOSE | (w ? NOTE_CLOSE_WRITE : 0)); 522 mtx_unlock(&sc->sc_mtx); 523 g_topology_lock(); 524 error = g_access(cp, r, w, e); 525 g_topology_unlock(); 526 return (error); 527 } 528 529 static int 530 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 531 { 532 struct g_consumer *cp; 533 struct g_provider *pp; 534 off_t offset, length, chunk, odd; 535 int i, error; 536 537 cp = dev->si_drv2; 538 pp = cp->provider; 539 540 /* If consumer or provider is dying, don't disturb. */ 541 if (cp->flags & G_CF_ORPHAN) 542 return (ENXIO); 543 if (pp->error) 544 return (pp->error); 545 546 error = 0; 547 KASSERT(cp->acr || cp->acw, 548 ("Consumer with zero access count in g_dev_ioctl")); 549 550 i = IOCPARM_LEN(cmd); 551 switch (cmd) { 552 case DIOCGSECTORSIZE: 553 *(u_int *)data = pp->sectorsize; 554 if (*(u_int *)data == 0) 555 error = ENOENT; 556 break; 557 case DIOCGMEDIASIZE: 558 *(off_t *)data = pp->mediasize; 559 if (*(off_t *)data == 0) 560 error = ENOENT; 561 break; 562 case DIOCGFWSECTORS: 563 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 564 if (error == 0 && *(u_int *)data == 0) 565 error = ENOENT; 566 break; 567 case DIOCGFWHEADS: 568 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 569 if (error == 0 && *(u_int *)data == 0) 570 error = ENOENT; 571 break; 572 case DIOCSKERNELDUMP: 573 { 574 struct diocskerneldump_arg *kda; 575 uint8_t *encryptedkey; 576 577 kda = (struct diocskerneldump_arg *)data; 578 if (kda->kda_index == KDA_REMOVE_ALL || 579 kda->kda_index == KDA_REMOVE_DEV || 580 kda->kda_index == KDA_REMOVE) { 581 error = dumper_remove(devtoname(dev), kda); 582 explicit_bzero(kda, sizeof(*kda)); 583 break; 584 } 585 586 if (kda->kda_encryption != KERNELDUMP_ENC_NONE) { 587 if (kda->kda_encryptedkeysize == 0 || 588 kda->kda_encryptedkeysize > 589 KERNELDUMP_ENCKEY_MAX_SIZE) { 590 explicit_bzero(kda, sizeof(*kda)); 591 return (EINVAL); 592 } 593 encryptedkey = malloc(kda->kda_encryptedkeysize, M_TEMP, 594 M_WAITOK); 595 error = copyin(kda->kda_encryptedkey, encryptedkey, 596 kda->kda_encryptedkeysize); 597 } else { 598 encryptedkey = NULL; 599 } 600 if (error == 0) { 601 kda->kda_encryptedkey = encryptedkey; 602 error = g_dev_setdumpdev(dev, kda); 603 } 604 zfree(encryptedkey, M_TEMP); 605 explicit_bzero(kda, sizeof(*kda)); 606 break; 607 } 608 case DIOCGFLUSH: 609 error = g_io_flush(cp); 610 break; 611 case DIOCGDELETE: 612 offset = ((off_t *)data)[0]; 613 length = ((off_t *)data)[1]; 614 if ((offset % pp->sectorsize) != 0 || 615 (length % pp->sectorsize) != 0 || length <= 0) { 616 printf("%s: offset=%jd length=%jd\n", __func__, offset, 617 length); 618 error = EINVAL; 619 break; 620 } 621 while (length > 0) { 622 chunk = length; 623 if (g_dev_del_max_sectors != 0 && 624 chunk > g_dev_del_max_sectors * pp->sectorsize) { 625 chunk = g_dev_del_max_sectors * pp->sectorsize; 626 if (pp->stripesize > 0) { 627 odd = (offset + chunk + 628 pp->stripeoffset) % pp->stripesize; 629 if (chunk > odd) 630 chunk -= odd; 631 } 632 } 633 error = g_delete_data(cp, offset, chunk); 634 length -= chunk; 635 offset += chunk; 636 if (error) 637 break; 638 /* 639 * Since the request size can be large, the service 640 * time can be is likewise. We make this ioctl 641 * interruptible by checking for signals for each bio. 642 */ 643 if (SIGPENDING(td)) 644 break; 645 } 646 break; 647 case DIOCGIDENT: 648 error = g_io_getattr("GEOM::ident", cp, &i, data); 649 break; 650 case DIOCGPROVIDERNAME: 651 strlcpy(data, pp->name, i); 652 break; 653 case DIOCGSTRIPESIZE: 654 *(off_t *)data = pp->stripesize; 655 break; 656 case DIOCGSTRIPEOFFSET: 657 *(off_t *)data = pp->stripeoffset; 658 break; 659 case DIOCGPHYSPATH: 660 error = g_io_getattr("GEOM::physpath", cp, &i, data); 661 if (error == 0 && *(char *)data == '\0') 662 error = ENOENT; 663 break; 664 case DIOCGATTR: { 665 struct diocgattr_arg *arg = (struct diocgattr_arg *)data; 666 667 if (arg->len > sizeof(arg->value)) { 668 error = EINVAL; 669 break; 670 } 671 error = g_io_getattr(arg->name, cp, &arg->len, &arg->value); 672 break; 673 } 674 case DIOCZONECMD: { 675 struct disk_zone_args *zone_args =(struct disk_zone_args *)data; 676 struct disk_zone_rep_entry *new_entries, *old_entries; 677 struct disk_zone_report *rep; 678 size_t alloc_size; 679 680 old_entries = NULL; 681 new_entries = NULL; 682 rep = NULL; 683 alloc_size = 0; 684 685 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES) { 686 rep = &zone_args->zone_params.report; 687 #define MAXENTRIES (maxphys / sizeof(struct disk_zone_rep_entry)) 688 if (rep->entries_allocated > MAXENTRIES) 689 rep->entries_allocated = MAXENTRIES; 690 alloc_size = rep->entries_allocated * 691 sizeof(struct disk_zone_rep_entry); 692 if (alloc_size != 0) 693 new_entries = g_malloc(alloc_size, 694 M_WAITOK | M_ZERO); 695 old_entries = rep->entries; 696 rep->entries = new_entries; 697 } 698 error = g_io_zonecmd(zone_args, cp); 699 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES && 700 alloc_size != 0 && error == 0) 701 error = copyout(new_entries, old_entries, alloc_size); 702 if (old_entries != NULL && rep != NULL) 703 rep->entries = old_entries; 704 g_free(new_entries); 705 break; 706 } 707 default: 708 if (pp->geom->ioctl != NULL) { 709 error = pp->geom->ioctl(pp, cmd, data, fflag, td); 710 } else { 711 error = ENOIOCTL; 712 } 713 } 714 715 return (error); 716 } 717 718 static void 719 g_dev_done(struct bio *bp2) 720 { 721 struct g_consumer *cp; 722 struct g_dev_softc *sc; 723 struct bio *bp; 724 int active; 725 726 cp = bp2->bio_from; 727 sc = cp->private; 728 bp = bp2->bio_parent; 729 bp->bio_error = bp2->bio_error; 730 bp->bio_completed = bp2->bio_completed; 731 bp->bio_resid = bp->bio_length - bp2->bio_completed; 732 if (bp2->bio_cmd == BIO_ZONE) 733 bcopy(&bp2->bio_zone, &bp->bio_zone, sizeof(bp->bio_zone)); 734 735 if (bp2->bio_error != 0) { 736 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 737 bp2, bp2->bio_error); 738 bp->bio_flags |= BIO_ERROR; 739 } else { 740 if (bp->bio_cmd == BIO_READ) 741 KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, NOTE_READ); 742 if (bp->bio_cmd == BIO_WRITE) 743 KNOTE_UNLOCKED(&sc->sc_selinfo.si_note, NOTE_WRITE); 744 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 745 bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed); 746 } 747 g_destroy_bio(bp2); 748 active = atomic_fetchadd_int(&sc->sc_active, -1) - 1; 749 if ((active & SC_A_ACTIVE) == 0) { 750 if ((active & SC_A_OPEN) == 0) 751 wakeup(&sc->sc_active); 752 if (active & SC_A_DESTROY) 753 g_post_event(g_dev_destroy, cp, M_NOWAIT, NULL); 754 } 755 biodone(bp); 756 } 757 758 static void 759 g_dev_strategy(struct bio *bp) 760 { 761 struct g_consumer *cp; 762 struct bio *bp2; 763 struct cdev *dev; 764 struct g_dev_softc *sc; 765 766 KASSERT(bp->bio_cmd == BIO_READ || 767 bp->bio_cmd == BIO_WRITE || 768 bp->bio_cmd == BIO_DELETE || 769 bp->bio_cmd == BIO_FLUSH || 770 bp->bio_cmd == BIO_ZONE, 771 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 772 dev = bp->bio_dev; 773 cp = dev->si_drv2; 774 KASSERT(cp->acr || cp->acw, 775 ("Consumer with zero access count in g_dev_strategy")); 776 biotrack(bp, __func__); 777 #ifdef INVARIANTS 778 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 779 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 780 bp->bio_resid = bp->bio_bcount; 781 biofinish(bp, NULL, EINVAL); 782 return; 783 } 784 #endif 785 sc = dev->si_drv1; 786 KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy")); 787 atomic_add_int(&sc->sc_active, 1); 788 789 for (;;) { 790 /* 791 * XXX: This is not an ideal solution, but I believe it to 792 * XXX: deadlock safely, all things considered. 793 */ 794 bp2 = g_clone_bio(bp); 795 if (bp2 != NULL) 796 break; 797 pause("gdstrat", hz / 10); 798 } 799 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 800 bp2->bio_done = g_dev_done; 801 g_trace(G_T_BIO, 802 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 803 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 804 bp2->bio_data, bp2->bio_cmd); 805 g_io_request(bp2, cp); 806 KASSERT(cp->acr || cp->acw, 807 ("g_dev_strategy raced with g_dev_close and lost")); 808 809 } 810 811 /* 812 * g_dev_callback() 813 * 814 * Called by devfs when asynchronous device destruction is completed. 815 * - Mark that we have no attached device any more. 816 * - If there are no outstanding requests, schedule geom destruction. 817 * Otherwise destruction will be scheduled later by g_dev_done(). 818 */ 819 820 static void 821 g_dev_callback(void *arg) 822 { 823 struct g_consumer *cp; 824 struct g_dev_softc *sc; 825 int active; 826 827 cp = arg; 828 sc = cp->private; 829 g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name); 830 831 sc->sc_dev = NULL; 832 sc->sc_alias = NULL; 833 active = atomic_fetchadd_int(&sc->sc_active, SC_A_DESTROY); 834 if ((active & SC_A_ACTIVE) == 0) 835 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 836 } 837 838 /* 839 * g_dev_orphan() 840 * 841 * Called from below when the provider orphaned us. 842 * - Clear any dump settings. 843 * - Request asynchronous device destruction to prevent any more requests 844 * from coming in. The provider is already marked with an error, so 845 * anything which comes in the interim will be returned immediately. 846 */ 847 848 static void 849 g_dev_orphan(struct g_consumer *cp) 850 { 851 struct cdev *dev; 852 struct g_dev_softc *sc; 853 854 g_topology_assert(); 855 sc = cp->private; 856 dev = sc->sc_dev; 857 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name); 858 859 /* Reset any dump-area set on this device */ 860 if (dev->si_flags & SI_DUMPDEV) { 861 struct diocskerneldump_arg kda; 862 863 bzero(&kda, sizeof(kda)); 864 kda.kda_index = KDA_REMOVE_DEV; 865 (void)dumper_remove(devtoname(dev), &kda); 866 } 867 868 /* Destroy the struct cdev *so we get no more requests */ 869 delist_dev(dev); 870 destroy_dev_sched_cb(dev, g_dev_callback, cp); 871 } 872 873 static void 874 gdev_filter_detach(struct knote *kn) 875 { 876 struct g_dev_softc *sc; 877 878 sc = kn->kn_hook; 879 880 knlist_remove(&sc->sc_selinfo.si_note, kn, 0); 881 } 882 883 static int 884 gdev_filter_vnode(struct knote *kn, long hint) 885 { 886 kn->kn_fflags |= kn->kn_sfflags & hint; 887 888 return (kn->kn_fflags != 0); 889 } 890 891 static int 892 g_dev_kqfilter(struct cdev *dev, struct knote *kn) 893 { 894 struct g_dev_softc *sc; 895 896 sc = dev->si_drv1; 897 898 if (kn->kn_filter != EVFILT_VNODE) 899 return (EINVAL); 900 901 #define SUPPORTED_EVENTS (NOTE_ATTRIB | NOTE_OPEN | NOTE_CLOSE | \ 902 NOTE_CLOSE_WRITE | NOTE_READ | NOTE_WRITE) 903 if (kn->kn_sfflags & ~SUPPORTED_EVENTS) 904 return (EOPNOTSUPP); 905 906 kn->kn_fop = &gdev_filterops_vnode; 907 kn->kn_hook = sc; 908 knlist_add(&sc->sc_selinfo.si_note, kn, 0); 909 910 return (0); 911 } 912 913 DECLARE_GEOM_CLASS(g_dev_class, g_dev);
Cache object: d40885f5db000d0401ece9fc6bd7eb03
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