Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/geom/geom_subr.c
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1 /*- 2 * Copyright (c) 2002 Poul-Henning Kamp 3 * Copyright (c) 2002 Networks Associates Technology, Inc. 4 * All rights reserved. 5 * 6 * This software was developed for the FreeBSD Project by Poul-Henning Kamp 7 * and NAI Labs, the Security Research Division of Network Associates, Inc. 8 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 9 * DARPA CHATS research program. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. The names of the authors may not be used to endorse or promote 20 * products derived from this software without specific prior written 21 * permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include "opt_ddb.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/devicestat.h> 44 #include <sys/kernel.h> 45 #include <sys/malloc.h> 46 #include <sys/bio.h> 47 #include <sys/sysctl.h> 48 #include <sys/proc.h> 49 #include <sys/kthread.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/errno.h> 53 #include <sys/sbuf.h> 54 #include <geom/geom.h> 55 #include <geom/geom_int.h> 56 #include <machine/stdarg.h> 57 58 #ifdef DDB 59 #include <ddb/ddb.h> 60 #endif 61 62 #ifdef KDB 63 #include <sys/kdb.h> 64 #endif 65 66 struct class_list_head g_classes = LIST_HEAD_INITIALIZER(g_classes); 67 static struct g_tailq_head geoms = TAILQ_HEAD_INITIALIZER(geoms); 68 char *g_wait_event, *g_wait_up, *g_wait_down, *g_wait_sim; 69 70 struct g_hh00 { 71 struct g_class *mp; 72 struct g_provider *pp; 73 off_t size; 74 int error; 75 int post; 76 }; 77 78 /* 79 * This event offers a new class a chance to taste all preexisting providers. 80 */ 81 static void 82 g_load_class(void *arg, int flag) 83 { 84 struct g_hh00 *hh; 85 struct g_class *mp2, *mp; 86 struct g_geom *gp; 87 struct g_provider *pp; 88 89 g_topology_assert(); 90 if (flag == EV_CANCEL) /* XXX: can't happen ? */ 91 return; 92 if (g_shutdown) 93 return; 94 95 hh = arg; 96 mp = hh->mp; 97 hh->error = 0; 98 if (hh->post) { 99 g_free(hh); 100 hh = NULL; 101 } 102 g_trace(G_T_TOPOLOGY, "g_load_class(%s)", mp->name); 103 KASSERT(mp->name != NULL && *mp->name != '\0', 104 ("GEOM class has no name")); 105 LIST_FOREACH(mp2, &g_classes, class) { 106 if (mp2 == mp) { 107 printf("The GEOM class %s is already loaded.\n", 108 mp2->name); 109 if (hh != NULL) 110 hh->error = EEXIST; 111 return; 112 } else if (strcmp(mp2->name, mp->name) == 0) { 113 printf("A GEOM class %s is already loaded.\n", 114 mp2->name); 115 if (hh != NULL) 116 hh->error = EEXIST; 117 return; 118 } 119 } 120 121 LIST_INIT(&mp->geom); 122 LIST_INSERT_HEAD(&g_classes, mp, class); 123 if (mp->init != NULL) 124 mp->init(mp); 125 if (mp->taste == NULL) 126 return; 127 LIST_FOREACH(mp2, &g_classes, class) { 128 if (mp == mp2) 129 continue; 130 LIST_FOREACH(gp, &mp2->geom, geom) { 131 LIST_FOREACH(pp, &gp->provider, provider) { 132 mp->taste(mp, pp, 0); 133 g_topology_assert(); 134 } 135 } 136 } 137 } 138 139 static int 140 g_unload_class(struct g_class *mp) 141 { 142 struct g_geom *gp; 143 struct g_provider *pp; 144 struct g_consumer *cp; 145 int error; 146 147 g_topology_lock(); 148 g_trace(G_T_TOPOLOGY, "g_unload_class(%s)", mp->name); 149 retry: 150 G_VALID_CLASS(mp); 151 LIST_FOREACH(gp, &mp->geom, geom) { 152 /* We refuse to unload if anything is open */ 153 LIST_FOREACH(pp, &gp->provider, provider) 154 if (pp->acr || pp->acw || pp->ace) { 155 g_topology_unlock(); 156 return (EBUSY); 157 } 158 LIST_FOREACH(cp, &gp->consumer, consumer) 159 if (cp->acr || cp->acw || cp->ace) { 160 g_topology_unlock(); 161 return (EBUSY); 162 } 163 /* If the geom is withering, wait for it to finish. */ 164 if (gp->flags & G_GEOM_WITHER) { 165 g_topology_sleep(mp, 1); 166 goto retry; 167 } 168 } 169 170 /* 171 * We allow unloading if we have no geoms, or a class 172 * method we can use to get rid of them. 173 */ 174 if (!LIST_EMPTY(&mp->geom) && mp->destroy_geom == NULL) { 175 g_topology_unlock(); 176 return (EOPNOTSUPP); 177 } 178 179 /* Bar new entries */ 180 mp->taste = NULL; 181 mp->config = NULL; 182 183 LIST_FOREACH(gp, &mp->geom, geom) { 184 error = mp->destroy_geom(NULL, mp, gp); 185 if (error != 0) { 186 g_topology_unlock(); 187 return (error); 188 } 189 } 190 /* Wait for withering to finish. */ 191 for (;;) { 192 gp = LIST_FIRST(&mp->geom); 193 if (gp == NULL) 194 break; 195 KASSERT(gp->flags & G_GEOM_WITHER, 196 ("Non-withering geom in class %s", mp->name)); 197 g_topology_sleep(mp, 1); 198 } 199 G_VALID_CLASS(mp); 200 if (mp->fini != NULL) 201 mp->fini(mp); 202 LIST_REMOVE(mp, class); 203 g_topology_unlock(); 204 205 return (0); 206 } 207 208 int 209 g_modevent(module_t mod, int type, void *data) 210 { 211 struct g_hh00 *hh; 212 int error; 213 static int g_ignition; 214 struct g_class *mp; 215 216 mp = data; 217 if (mp->version != G_VERSION) { 218 printf("GEOM class %s has Wrong version %x\n", 219 mp->name, mp->version); 220 return (EINVAL); 221 } 222 if (!g_ignition) { 223 g_ignition++; 224 g_init(); 225 } 226 error = EOPNOTSUPP; 227 switch (type) { 228 case MOD_LOAD: 229 g_trace(G_T_TOPOLOGY, "g_modevent(%s, LOAD)", mp->name); 230 hh = g_malloc(sizeof *hh, M_WAITOK | M_ZERO); 231 hh->mp = mp; 232 /* 233 * Once the system is not cold, MOD_LOAD calls will be 234 * from the userland and the g_event thread will be able 235 * to acknowledge their completion. 236 */ 237 if (cold) { 238 hh->post = 1; 239 error = g_post_event(g_load_class, hh, M_WAITOK, NULL); 240 } else { 241 error = g_waitfor_event(g_load_class, hh, M_WAITOK, 242 NULL); 243 if (error == 0) 244 error = hh->error; 245 g_free(hh); 246 } 247 break; 248 case MOD_UNLOAD: 249 g_trace(G_T_TOPOLOGY, "g_modevent(%s, UNLOAD)", mp->name); 250 DROP_GIANT(); 251 error = g_unload_class(mp); 252 PICKUP_GIANT(); 253 if (error == 0) { 254 KASSERT(LIST_EMPTY(&mp->geom), 255 ("Unloaded class (%s) still has geom", mp->name)); 256 } 257 break; 258 } 259 return (error); 260 } 261 262 static void 263 g_retaste_event(void *arg, int flag) 264 { 265 struct g_class *mp, *mp2; 266 struct g_geom *gp; 267 struct g_hh00 *hh; 268 struct g_provider *pp; 269 struct g_consumer *cp; 270 271 g_topology_assert(); 272 if (flag == EV_CANCEL) /* XXX: can't happen ? */ 273 return; 274 if (g_shutdown || g_notaste) 275 return; 276 277 hh = arg; 278 mp = hh->mp; 279 hh->error = 0; 280 if (hh->post) { 281 g_free(hh); 282 hh = NULL; 283 } 284 g_trace(G_T_TOPOLOGY, "g_retaste(%s)", mp->name); 285 286 LIST_FOREACH(mp2, &g_classes, class) { 287 LIST_FOREACH(gp, &mp2->geom, geom) { 288 LIST_FOREACH(pp, &gp->provider, provider) { 289 if (pp->acr || pp->acw || pp->ace) 290 continue; 291 LIST_FOREACH(cp, &pp->consumers, consumers) { 292 if (cp->geom->class == mp && 293 (cp->flags & G_CF_ORPHAN) == 0) 294 break; 295 } 296 if (cp != NULL) { 297 cp->flags |= G_CF_ORPHAN; 298 g_wither_geom(cp->geom, ENXIO); 299 } 300 mp->taste(mp, pp, 0); 301 g_topology_assert(); 302 } 303 } 304 } 305 } 306 307 int 308 g_retaste(struct g_class *mp) 309 { 310 struct g_hh00 *hh; 311 int error; 312 313 if (mp->taste == NULL) 314 return (EINVAL); 315 316 hh = g_malloc(sizeof *hh, M_WAITOK | M_ZERO); 317 hh->mp = mp; 318 319 if (cold) { 320 hh->post = 1; 321 error = g_post_event(g_retaste_event, hh, M_WAITOK, NULL); 322 } else { 323 error = g_waitfor_event(g_retaste_event, hh, M_WAITOK, NULL); 324 if (error == 0) 325 error = hh->error; 326 g_free(hh); 327 } 328 329 return (error); 330 } 331 332 struct g_geom * 333 g_new_geomf(struct g_class *mp, const char *fmt, ...) 334 { 335 struct g_geom *gp; 336 va_list ap; 337 struct sbuf *sb; 338 339 g_topology_assert(); 340 G_VALID_CLASS(mp); 341 sb = sbuf_new_auto(); 342 va_start(ap, fmt); 343 sbuf_vprintf(sb, fmt, ap); 344 va_end(ap); 345 sbuf_finish(sb); 346 gp = g_malloc(sizeof *gp, M_WAITOK | M_ZERO); 347 gp->name = g_malloc(sbuf_len(sb) + 1, M_WAITOK | M_ZERO); 348 gp->class = mp; 349 gp->rank = 1; 350 LIST_INIT(&gp->consumer); 351 LIST_INIT(&gp->provider); 352 LIST_INSERT_HEAD(&mp->geom, gp, geom); 353 TAILQ_INSERT_HEAD(&geoms, gp, geoms); 354 strcpy(gp->name, sbuf_data(sb)); 355 sbuf_delete(sb); 356 /* Fill in defaults from class */ 357 gp->start = mp->start; 358 gp->spoiled = mp->spoiled; 359 gp->attrchanged = mp->attrchanged; 360 gp->providergone = mp->providergone; 361 gp->dumpconf = mp->dumpconf; 362 gp->access = mp->access; 363 gp->orphan = mp->orphan; 364 gp->ioctl = mp->ioctl; 365 gp->resize = mp->resize; 366 return (gp); 367 } 368 369 void 370 g_destroy_geom(struct g_geom *gp) 371 { 372 373 g_topology_assert(); 374 G_VALID_GEOM(gp); 375 g_trace(G_T_TOPOLOGY, "g_destroy_geom(%p(%s))", gp, gp->name); 376 KASSERT(LIST_EMPTY(&gp->consumer), 377 ("g_destroy_geom(%s) with consumer(s) [%p]", 378 gp->name, LIST_FIRST(&gp->consumer))); 379 KASSERT(LIST_EMPTY(&gp->provider), 380 ("g_destroy_geom(%s) with provider(s) [%p]", 381 gp->name, LIST_FIRST(&gp->provider))); 382 g_cancel_event(gp); 383 LIST_REMOVE(gp, geom); 384 TAILQ_REMOVE(&geoms, gp, geoms); 385 g_free(gp->name); 386 g_free(gp); 387 } 388 389 /* 390 * This function is called (repeatedly) until the geom has withered away. 391 */ 392 void 393 g_wither_geom(struct g_geom *gp, int error) 394 { 395 struct g_provider *pp; 396 397 g_topology_assert(); 398 G_VALID_GEOM(gp); 399 g_trace(G_T_TOPOLOGY, "g_wither_geom(%p(%s))", gp, gp->name); 400 if (!(gp->flags & G_GEOM_WITHER)) { 401 gp->flags |= G_GEOM_WITHER; 402 LIST_FOREACH(pp, &gp->provider, provider) 403 if (!(pp->flags & G_PF_ORPHAN)) 404 g_orphan_provider(pp, error); 405 } 406 g_do_wither(); 407 } 408 409 /* 410 * Convenience function to destroy a particular provider. 411 */ 412 void 413 g_wither_provider(struct g_provider *pp, int error) 414 { 415 416 pp->flags |= G_PF_WITHER; 417 if (!(pp->flags & G_PF_ORPHAN)) 418 g_orphan_provider(pp, error); 419 } 420 421 /* 422 * This function is called (repeatedly) until the has withered away. 423 */ 424 void 425 g_wither_geom_close(struct g_geom *gp, int error) 426 { 427 struct g_consumer *cp; 428 429 g_topology_assert(); 430 G_VALID_GEOM(gp); 431 g_trace(G_T_TOPOLOGY, "g_wither_geom_close(%p(%s))", gp, gp->name); 432 LIST_FOREACH(cp, &gp->consumer, consumer) 433 if (cp->acr || cp->acw || cp->ace) 434 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 435 g_wither_geom(gp, error); 436 } 437 438 /* 439 * This function is called (repeatedly) until we cant wash away more 440 * withered bits at present. 441 */ 442 void 443 g_wither_washer() 444 { 445 struct g_class *mp; 446 struct g_geom *gp, *gp2; 447 struct g_provider *pp, *pp2; 448 struct g_consumer *cp, *cp2; 449 450 g_topology_assert(); 451 LIST_FOREACH(mp, &g_classes, class) { 452 LIST_FOREACH_SAFE(gp, &mp->geom, geom, gp2) { 453 LIST_FOREACH_SAFE(pp, &gp->provider, provider, pp2) { 454 if (!(pp->flags & G_PF_WITHER)) 455 continue; 456 if (LIST_EMPTY(&pp->consumers)) 457 g_destroy_provider(pp); 458 } 459 if (!(gp->flags & G_GEOM_WITHER)) 460 continue; 461 LIST_FOREACH_SAFE(pp, &gp->provider, provider, pp2) { 462 if (LIST_EMPTY(&pp->consumers)) 463 g_destroy_provider(pp); 464 } 465 LIST_FOREACH_SAFE(cp, &gp->consumer, consumer, cp2) { 466 if (cp->acr || cp->acw || cp->ace) 467 continue; 468 if (cp->provider != NULL) 469 g_detach(cp); 470 g_destroy_consumer(cp); 471 } 472 if (LIST_EMPTY(&gp->provider) && 473 LIST_EMPTY(&gp->consumer)) 474 g_destroy_geom(gp); 475 } 476 } 477 } 478 479 struct g_consumer * 480 g_new_consumer(struct g_geom *gp) 481 { 482 struct g_consumer *cp; 483 484 g_topology_assert(); 485 G_VALID_GEOM(gp); 486 KASSERT(!(gp->flags & G_GEOM_WITHER), 487 ("g_new_consumer on WITHERing geom(%s) (class %s)", 488 gp->name, gp->class->name)); 489 KASSERT(gp->orphan != NULL, 490 ("g_new_consumer on geom(%s) (class %s) without orphan", 491 gp->name, gp->class->name)); 492 493 cp = g_malloc(sizeof *cp, M_WAITOK | M_ZERO); 494 cp->geom = gp; 495 cp->stat = devstat_new_entry(cp, -1, 0, DEVSTAT_ALL_SUPPORTED, 496 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 497 LIST_INSERT_HEAD(&gp->consumer, cp, consumer); 498 return(cp); 499 } 500 501 void 502 g_destroy_consumer(struct g_consumer *cp) 503 { 504 struct g_geom *gp; 505 506 g_topology_assert(); 507 G_VALID_CONSUMER(cp); 508 g_trace(G_T_TOPOLOGY, "g_destroy_consumer(%p)", cp); 509 KASSERT (cp->provider == NULL, ("g_destroy_consumer but attached")); 510 KASSERT (cp->acr == 0, ("g_destroy_consumer with acr")); 511 KASSERT (cp->acw == 0, ("g_destroy_consumer with acw")); 512 KASSERT (cp->ace == 0, ("g_destroy_consumer with ace")); 513 g_cancel_event(cp); 514 gp = cp->geom; 515 LIST_REMOVE(cp, consumer); 516 devstat_remove_entry(cp->stat); 517 g_free(cp); 518 if (gp->flags & G_GEOM_WITHER) 519 g_do_wither(); 520 } 521 522 static void 523 g_new_provider_event(void *arg, int flag) 524 { 525 struct g_class *mp; 526 struct g_provider *pp; 527 struct g_consumer *cp, *next_cp; 528 529 g_topology_assert(); 530 if (flag == EV_CANCEL) 531 return; 532 if (g_shutdown) 533 return; 534 pp = arg; 535 G_VALID_PROVIDER(pp); 536 KASSERT(!(pp->flags & G_PF_WITHER), 537 ("g_new_provider_event but withered")); 538 LIST_FOREACH_SAFE(cp, &pp->consumers, consumers, next_cp) { 539 if ((cp->flags & G_CF_ORPHAN) == 0 && 540 cp->geom->attrchanged != NULL) 541 cp->geom->attrchanged(cp, "GEOM::media"); 542 } 543 if (g_notaste) 544 return; 545 LIST_FOREACH(mp, &g_classes, class) { 546 if (mp->taste == NULL) 547 continue; 548 LIST_FOREACH(cp, &pp->consumers, consumers) 549 if (cp->geom->class == mp && 550 (cp->flags & G_CF_ORPHAN) == 0) 551 break; 552 if (cp != NULL) 553 continue; 554 mp->taste(mp, pp, 0); 555 g_topology_assert(); 556 } 557 } 558 559 560 struct g_provider * 561 g_new_providerf(struct g_geom *gp, const char *fmt, ...) 562 { 563 struct g_provider *pp; 564 struct sbuf *sb; 565 va_list ap; 566 567 g_topology_assert(); 568 G_VALID_GEOM(gp); 569 KASSERT(gp->access != NULL, 570 ("new provider on geom(%s) without ->access (class %s)", 571 gp->name, gp->class->name)); 572 KASSERT(gp->start != NULL, 573 ("new provider on geom(%s) without ->start (class %s)", 574 gp->name, gp->class->name)); 575 KASSERT(!(gp->flags & G_GEOM_WITHER), 576 ("new provider on WITHERing geom(%s) (class %s)", 577 gp->name, gp->class->name)); 578 sb = sbuf_new_auto(); 579 va_start(ap, fmt); 580 sbuf_vprintf(sb, fmt, ap); 581 va_end(ap); 582 sbuf_finish(sb); 583 pp = g_malloc(sizeof *pp + sbuf_len(sb) + 1, M_WAITOK | M_ZERO); 584 pp->name = (char *)(pp + 1); 585 strcpy(pp->name, sbuf_data(sb)); 586 sbuf_delete(sb); 587 LIST_INIT(&pp->consumers); 588 pp->error = ENXIO; 589 pp->geom = gp; 590 pp->stat = devstat_new_entry(pp, -1, 0, DEVSTAT_ALL_SUPPORTED, 591 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 592 LIST_INSERT_HEAD(&gp->provider, pp, provider); 593 g_post_event(g_new_provider_event, pp, M_WAITOK, pp, gp, NULL); 594 return (pp); 595 } 596 597 void 598 g_error_provider(struct g_provider *pp, int error) 599 { 600 601 /* G_VALID_PROVIDER(pp); We may not have g_topology */ 602 pp->error = error; 603 } 604 605 static void 606 g_resize_provider_event(void *arg, int flag) 607 { 608 struct g_hh00 *hh; 609 struct g_class *mp; 610 struct g_geom *gp; 611 struct g_provider *pp; 612 struct g_consumer *cp, *cp2; 613 off_t size; 614 615 g_topology_assert(); 616 if (g_shutdown) 617 return; 618 619 hh = arg; 620 pp = hh->pp; 621 size = hh->size; 622 g_free(hh); 623 624 G_VALID_PROVIDER(pp); 625 g_trace(G_T_TOPOLOGY, "g_resize_provider_event(%p)", pp); 626 627 LIST_FOREACH_SAFE(cp, &pp->consumers, consumers, cp2) { 628 gp = cp->geom; 629 if (gp->resize == NULL && size < pp->mediasize) { 630 cp->flags |= G_CF_ORPHAN; 631 cp->geom->orphan(cp); 632 } 633 } 634 635 pp->mediasize = size; 636 637 LIST_FOREACH_SAFE(cp, &pp->consumers, consumers, cp2) { 638 gp = cp->geom; 639 if (gp->resize != NULL) 640 gp->resize(cp); 641 } 642 643 /* 644 * After resizing, the previously invalid GEOM class metadata 645 * might become valid. This means we should retaste. 646 */ 647 LIST_FOREACH(mp, &g_classes, class) { 648 if (mp->taste == NULL) 649 continue; 650 LIST_FOREACH(cp, &pp->consumers, consumers) 651 if (cp->geom->class == mp && 652 (cp->flags & G_CF_ORPHAN) == 0) 653 break; 654 if (cp != NULL) 655 continue; 656 mp->taste(mp, pp, 0); 657 g_topology_assert(); 658 } 659 } 660 661 void 662 g_resize_provider(struct g_provider *pp, off_t size) 663 { 664 struct g_hh00 *hh; 665 666 G_VALID_PROVIDER(pp); 667 668 if (size == pp->mediasize) 669 return; 670 671 hh = g_malloc(sizeof *hh, M_WAITOK | M_ZERO); 672 hh->pp = pp; 673 hh->size = size; 674 g_post_event(g_resize_provider_event, hh, M_WAITOK, NULL); 675 } 676 677 #ifndef _PATH_DEV 678 #define _PATH_DEV "/dev/" 679 #endif 680 681 struct g_provider * 682 g_provider_by_name(char const *arg) 683 { 684 struct g_class *cp; 685 struct g_geom *gp; 686 struct g_provider *pp, *wpp; 687 688 if (strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0) 689 arg += sizeof(_PATH_DEV) - 1; 690 691 wpp = NULL; 692 LIST_FOREACH(cp, &g_classes, class) { 693 LIST_FOREACH(gp, &cp->geom, geom) { 694 LIST_FOREACH(pp, &gp->provider, provider) { 695 if (strcmp(arg, pp->name) != 0) 696 continue; 697 if ((gp->flags & G_GEOM_WITHER) == 0 && 698 (pp->flags & G_PF_WITHER) == 0) 699 return (pp); 700 else 701 wpp = pp; 702 } 703 } 704 } 705 706 return (wpp); 707 } 708 709 void 710 g_destroy_provider(struct g_provider *pp) 711 { 712 struct g_geom *gp; 713 714 g_topology_assert(); 715 G_VALID_PROVIDER(pp); 716 KASSERT(LIST_EMPTY(&pp->consumers), 717 ("g_destroy_provider but attached")); 718 KASSERT (pp->acr == 0, ("g_destroy_provider with acr")); 719 KASSERT (pp->acw == 0, ("g_destroy_provider with acw")); 720 KASSERT (pp->ace == 0, ("g_destroy_provider with ace")); 721 g_cancel_event(pp); 722 LIST_REMOVE(pp, provider); 723 gp = pp->geom; 724 devstat_remove_entry(pp->stat); 725 /* 726 * If a callback was provided, send notification that the provider 727 * is now gone. 728 */ 729 if (gp->providergone != NULL) 730 gp->providergone(pp); 731 732 g_free(pp); 733 if ((gp->flags & G_GEOM_WITHER)) 734 g_do_wither(); 735 } 736 737 /* 738 * We keep the "geoms" list sorted by topological order (== increasing 739 * numerical rank) at all times. 740 * When an attach is done, the attaching geoms rank is invalidated 741 * and it is moved to the tail of the list. 742 * All geoms later in the sequence has their ranks reevaluated in 743 * sequence. If we cannot assign rank to a geom because it's 744 * prerequisites do not have rank, we move that element to the tail 745 * of the sequence with invalid rank as well. 746 * At some point we encounter our original geom and if we stil fail 747 * to assign it a rank, there must be a loop and we fail back to 748 * g_attach() which detach again and calls redo_rank again 749 * to fix up the damage. 750 * It would be much simpler code wise to do it recursively, but we 751 * can't risk that on the kernel stack. 752 */ 753 754 static int 755 redo_rank(struct g_geom *gp) 756 { 757 struct g_consumer *cp; 758 struct g_geom *gp1, *gp2; 759 int n, m; 760 761 g_topology_assert(); 762 G_VALID_GEOM(gp); 763 764 /* Invalidate this geoms rank and move it to the tail */ 765 gp1 = TAILQ_NEXT(gp, geoms); 766 if (gp1 != NULL) { 767 gp->rank = 0; 768 TAILQ_REMOVE(&geoms, gp, geoms); 769 TAILQ_INSERT_TAIL(&geoms, gp, geoms); 770 } else { 771 gp1 = gp; 772 } 773 774 /* re-rank the rest of the sequence */ 775 for (; gp1 != NULL; gp1 = gp2) { 776 gp1->rank = 0; 777 m = 1; 778 LIST_FOREACH(cp, &gp1->consumer, consumer) { 779 if (cp->provider == NULL) 780 continue; 781 n = cp->provider->geom->rank; 782 if (n == 0) { 783 m = 0; 784 break; 785 } else if (n >= m) 786 m = n + 1; 787 } 788 gp1->rank = m; 789 gp2 = TAILQ_NEXT(gp1, geoms); 790 791 /* got a rank, moving on */ 792 if (m != 0) 793 continue; 794 795 /* no rank to original geom means loop */ 796 if (gp == gp1) 797 return (ELOOP); 798 799 /* no rank, put it at the end move on */ 800 TAILQ_REMOVE(&geoms, gp1, geoms); 801 TAILQ_INSERT_TAIL(&geoms, gp1, geoms); 802 } 803 return (0); 804 } 805 806 int 807 g_attach(struct g_consumer *cp, struct g_provider *pp) 808 { 809 int error; 810 811 g_topology_assert(); 812 G_VALID_CONSUMER(cp); 813 G_VALID_PROVIDER(pp); 814 g_trace(G_T_TOPOLOGY, "g_attach(%p, %p)", cp, pp); 815 KASSERT(cp->provider == NULL, ("attach but attached")); 816 cp->provider = pp; 817 LIST_INSERT_HEAD(&pp->consumers, cp, consumers); 818 error = redo_rank(cp->geom); 819 if (error) { 820 LIST_REMOVE(cp, consumers); 821 cp->provider = NULL; 822 redo_rank(cp->geom); 823 } 824 return (error); 825 } 826 827 void 828 g_detach(struct g_consumer *cp) 829 { 830 struct g_provider *pp; 831 832 g_topology_assert(); 833 G_VALID_CONSUMER(cp); 834 g_trace(G_T_TOPOLOGY, "g_detach(%p)", cp); 835 KASSERT(cp->provider != NULL, ("detach but not attached")); 836 KASSERT(cp->acr == 0, ("detach but nonzero acr")); 837 KASSERT(cp->acw == 0, ("detach but nonzero acw")); 838 KASSERT(cp->ace == 0, ("detach but nonzero ace")); 839 KASSERT(cp->nstart == cp->nend, 840 ("detach with active requests")); 841 pp = cp->provider; 842 LIST_REMOVE(cp, consumers); 843 cp->provider = NULL; 844 if ((cp->geom->flags & G_GEOM_WITHER) || 845 (pp->geom->flags & G_GEOM_WITHER) || 846 (pp->flags & G_PF_WITHER)) 847 g_do_wither(); 848 redo_rank(cp->geom); 849 } 850 851 /* 852 * g_access() 853 * 854 * Access-check with delta values. The question asked is "can provider 855 * "cp" change the access counters by the relative amounts dc[rwe] ?" 856 */ 857 858 int 859 g_access(struct g_consumer *cp, int dcr, int dcw, int dce) 860 { 861 struct g_provider *pp; 862 struct g_geom *gp; 863 int pw, pe; 864 #ifdef INVARIANTS 865 int sr, sw, se; 866 #endif 867 int error; 868 869 g_topology_assert(); 870 G_VALID_CONSUMER(cp); 871 pp = cp->provider; 872 KASSERT(pp != NULL, ("access but not attached")); 873 G_VALID_PROVIDER(pp); 874 gp = pp->geom; 875 876 g_trace(G_T_ACCESS, "g_access(%p(%s), %d, %d, %d)", 877 cp, pp->name, dcr, dcw, dce); 878 879 KASSERT(cp->acr + dcr >= 0, ("access resulting in negative acr")); 880 KASSERT(cp->acw + dcw >= 0, ("access resulting in negative acw")); 881 KASSERT(cp->ace + dce >= 0, ("access resulting in negative ace")); 882 KASSERT(dcr != 0 || dcw != 0 || dce != 0, ("NOP access request")); 883 KASSERT(gp->access != NULL, ("NULL geom->access")); 884 885 /* 886 * If our class cares about being spoiled, and we have been, we 887 * are probably just ahead of the event telling us that. Fail 888 * now rather than having to unravel this later. 889 */ 890 if (cp->geom->spoiled != NULL && (cp->flags & G_CF_SPOILED) && 891 (dcr > 0 || dcw > 0 || dce > 0)) 892 return (ENXIO); 893 894 /* 895 * A number of GEOM classes either need to perform an I/O on the first 896 * open or to acquire a different subsystem's lock. To do that they 897 * may have to drop the topology lock. 898 * Other GEOM classes perform special actions when opening a lower rank 899 * geom for the first time. As a result, more than one thread may 900 * end up performing the special actions. 901 * So, we prevent concurrent "first" opens by marking the consumer with 902 * special flag. 903 * 904 * Note that if the geom's access method never drops the topology lock, 905 * then we will never see G_GEOM_IN_ACCESS here. 906 */ 907 while ((gp->flags & G_GEOM_IN_ACCESS) != 0) { 908 g_trace(G_T_ACCESS, 909 "%s: race on geom %s via provider %s and consumer of %s", 910 __func__, gp->name, pp->name, cp->geom->name); 911 gp->flags |= G_GEOM_ACCESS_WAIT; 912 g_topology_sleep(gp, 0); 913 } 914 915 /* 916 * Figure out what counts the provider would have had, if this 917 * consumer had (r0w0e0) at this time. 918 */ 919 pw = pp->acw - cp->acw; 920 pe = pp->ace - cp->ace; 921 922 g_trace(G_T_ACCESS, 923 "open delta:[r%dw%de%d] old:[r%dw%de%d] provider:[r%dw%de%d] %p(%s)", 924 dcr, dcw, dce, 925 cp->acr, cp->acw, cp->ace, 926 pp->acr, pp->acw, pp->ace, 927 pp, pp->name); 928 929 /* If foot-shooting is enabled, any open on rank#1 is OK */ 930 if ((g_debugflags & 16) && gp->rank == 1) 931 ; 932 /* If we try exclusive but already write: fail */ 933 else if (dce > 0 && pw > 0) 934 return (EPERM); 935 /* If we try write but already exclusive: fail */ 936 else if (dcw > 0 && pe > 0) 937 return (EPERM); 938 /* If we try to open more but provider is error'ed: fail */ 939 else if ((dcr > 0 || dcw > 0 || dce > 0) && pp->error != 0) 940 return (pp->error); 941 942 /* Ok then... */ 943 944 #ifdef INVARIANTS 945 sr = cp->acr; 946 sw = cp->acw; 947 se = cp->ace; 948 #endif 949 gp->flags |= G_GEOM_IN_ACCESS; 950 error = gp->access(pp, dcr, dcw, dce); 951 KASSERT(dcr > 0 || dcw > 0 || dce > 0 || error == 0, 952 ("Geom provider %s::%s dcr=%d dcw=%d dce=%d error=%d failed " 953 "closing ->access()", gp->class->name, pp->name, dcr, dcw, 954 dce, error)); 955 956 g_topology_assert(); 957 gp->flags &= ~G_GEOM_IN_ACCESS; 958 KASSERT(cp->acr == sr && cp->acw == sw && cp->ace == se, 959 ("Access counts changed during geom->access")); 960 if ((gp->flags & G_GEOM_ACCESS_WAIT) != 0) { 961 gp->flags &= ~G_GEOM_ACCESS_WAIT; 962 wakeup(gp); 963 } 964 965 if (!error) { 966 /* 967 * If we open first write, spoil any partner consumers. 968 * If we close last write and provider is not errored, 969 * trigger re-taste. 970 */ 971 if (pp->acw == 0 && dcw != 0) 972 g_spoil(pp, cp); 973 else if (pp->acw != 0 && pp->acw == -dcw && pp->error == 0 && 974 !(gp->flags & G_GEOM_WITHER)) 975 g_post_event(g_new_provider_event, pp, M_WAITOK, 976 pp, NULL); 977 978 pp->acr += dcr; 979 pp->acw += dcw; 980 pp->ace += dce; 981 cp->acr += dcr; 982 cp->acw += dcw; 983 cp->ace += dce; 984 if (pp->acr != 0 || pp->acw != 0 || pp->ace != 0) 985 KASSERT(pp->sectorsize > 0, 986 ("Provider %s lacks sectorsize", pp->name)); 987 if ((cp->geom->flags & G_GEOM_WITHER) && 988 cp->acr == 0 && cp->acw == 0 && cp->ace == 0) 989 g_do_wither(); 990 } 991 return (error); 992 } 993 994 int 995 g_handleattr_int(struct bio *bp, const char *attribute, int val) 996 { 997 998 return (g_handleattr(bp, attribute, &val, sizeof val)); 999 } 1000 1001 int 1002 g_handleattr_uint16_t(struct bio *bp, const char *attribute, uint16_t val) 1003 { 1004 1005 return (g_handleattr(bp, attribute, &val, sizeof val)); 1006 } 1007 1008 int 1009 g_handleattr_off_t(struct bio *bp, const char *attribute, off_t val) 1010 { 1011 1012 return (g_handleattr(bp, attribute, &val, sizeof val)); 1013 } 1014 1015 int 1016 g_handleattr_str(struct bio *bp, const char *attribute, const char *str) 1017 { 1018 1019 return (g_handleattr(bp, attribute, str, 0)); 1020 } 1021 1022 int 1023 g_handleattr(struct bio *bp, const char *attribute, const void *val, int len) 1024 { 1025 int error = 0; 1026 1027 if (strcmp(bp->bio_attribute, attribute)) 1028 return (0); 1029 if (len == 0) { 1030 bzero(bp->bio_data, bp->bio_length); 1031 if (strlcpy(bp->bio_data, val, bp->bio_length) >= 1032 bp->bio_length) { 1033 printf("%s: %s bio_length %jd len %zu -> EFAULT\n", 1034 __func__, bp->bio_to->name, 1035 (intmax_t)bp->bio_length, strlen(val)); 1036 error = EFAULT; 1037 } 1038 } else if (bp->bio_length == len) { 1039 bcopy(val, bp->bio_data, len); 1040 } else { 1041 printf("%s: %s bio_length %jd len %d -> EFAULT\n", __func__, 1042 bp->bio_to->name, (intmax_t)bp->bio_length, len); 1043 error = EFAULT; 1044 } 1045 if (error == 0) 1046 bp->bio_completed = bp->bio_length; 1047 g_io_deliver(bp, error); 1048 return (1); 1049 } 1050 1051 int 1052 g_std_access(struct g_provider *pp, 1053 int dr __unused, int dw __unused, int de __unused) 1054 { 1055 1056 g_topology_assert(); 1057 G_VALID_PROVIDER(pp); 1058 return (0); 1059 } 1060 1061 void 1062 g_std_done(struct bio *bp) 1063 { 1064 struct bio *bp2; 1065 1066 bp2 = bp->bio_parent; 1067 if (bp2->bio_error == 0) 1068 bp2->bio_error = bp->bio_error; 1069 bp2->bio_completed += bp->bio_completed; 1070 g_destroy_bio(bp); 1071 bp2->bio_inbed++; 1072 if (bp2->bio_children == bp2->bio_inbed) 1073 g_io_deliver(bp2, bp2->bio_error); 1074 } 1075 1076 /* XXX: maybe this is only g_slice_spoiled */ 1077 1078 void 1079 g_std_spoiled(struct g_consumer *cp) 1080 { 1081 struct g_geom *gp; 1082 struct g_provider *pp; 1083 1084 g_topology_assert(); 1085 G_VALID_CONSUMER(cp); 1086 g_trace(G_T_TOPOLOGY, "g_std_spoiled(%p)", cp); 1087 cp->flags |= G_CF_ORPHAN; 1088 g_detach(cp); 1089 gp = cp->geom; 1090 LIST_FOREACH(pp, &gp->provider, provider) 1091 g_orphan_provider(pp, ENXIO); 1092 g_destroy_consumer(cp); 1093 if (LIST_EMPTY(&gp->provider) && LIST_EMPTY(&gp->consumer)) 1094 g_destroy_geom(gp); 1095 else 1096 gp->flags |= G_GEOM_WITHER; 1097 } 1098 1099 /* 1100 * Spoiling happens when a provider is opened for writing, but consumers 1101 * which are configured by in-band data are attached (slicers for instance). 1102 * Since the write might potentially change the in-band data, such consumers 1103 * need to re-evaluate their existence after the writing session closes. 1104 * We do this by (offering to) tear them down when the open for write happens 1105 * in return for a re-taste when it closes again. 1106 * Together with the fact that such consumers grab an 'e' bit whenever they 1107 * are open, regardless of mode, this ends up DTRT. 1108 */ 1109 1110 static void 1111 g_spoil_event(void *arg, int flag) 1112 { 1113 struct g_provider *pp; 1114 struct g_consumer *cp, *cp2; 1115 1116 g_topology_assert(); 1117 if (flag == EV_CANCEL) 1118 return; 1119 pp = arg; 1120 G_VALID_PROVIDER(pp); 1121 g_trace(G_T_TOPOLOGY, "%s %p(%s:%s:%s)", __func__, pp, 1122 pp->geom->class->name, pp->geom->name, pp->name); 1123 for (cp = LIST_FIRST(&pp->consumers); cp != NULL; cp = cp2) { 1124 cp2 = LIST_NEXT(cp, consumers); 1125 if ((cp->flags & G_CF_SPOILED) == 0) 1126 continue; 1127 cp->flags &= ~G_CF_SPOILED; 1128 if (cp->geom->spoiled == NULL) 1129 continue; 1130 cp->geom->spoiled(cp); 1131 g_topology_assert(); 1132 } 1133 } 1134 1135 void 1136 g_spoil(struct g_provider *pp, struct g_consumer *cp) 1137 { 1138 struct g_consumer *cp2; 1139 1140 g_topology_assert(); 1141 G_VALID_PROVIDER(pp); 1142 G_VALID_CONSUMER(cp); 1143 1144 LIST_FOREACH(cp2, &pp->consumers, consumers) { 1145 if (cp2 == cp) 1146 continue; 1147 /* 1148 KASSERT(cp2->acr == 0, ("spoiling cp->acr = %d", cp2->acr)); 1149 KASSERT(cp2->acw == 0, ("spoiling cp->acw = %d", cp2->acw)); 1150 */ 1151 KASSERT(cp2->ace == 0, ("spoiling cp->ace = %d", cp2->ace)); 1152 cp2->flags |= G_CF_SPOILED; 1153 } 1154 g_post_event(g_spoil_event, pp, M_WAITOK, pp, NULL); 1155 } 1156 1157 static void 1158 g_media_changed_event(void *arg, int flag) 1159 { 1160 struct g_provider *pp; 1161 int retaste; 1162 1163 g_topology_assert(); 1164 if (flag == EV_CANCEL) 1165 return; 1166 pp = arg; 1167 G_VALID_PROVIDER(pp); 1168 1169 /* 1170 * If provider was not open for writing, queue retaste after spoiling. 1171 * If it was, retaste will happen automatically on close. 1172 */ 1173 retaste = (pp->acw == 0 && pp->error == 0 && 1174 !(pp->geom->flags & G_GEOM_WITHER)); 1175 g_spoil_event(arg, flag); 1176 if (retaste) 1177 g_post_event(g_new_provider_event, pp, M_WAITOK, pp, NULL); 1178 } 1179 1180 int 1181 g_media_changed(struct g_provider *pp, int flag) 1182 { 1183 struct g_consumer *cp; 1184 1185 LIST_FOREACH(cp, &pp->consumers, consumers) 1186 cp->flags |= G_CF_SPOILED; 1187 return (g_post_event(g_media_changed_event, pp, flag, pp, NULL)); 1188 } 1189 1190 int 1191 g_media_gone(struct g_provider *pp, int flag) 1192 { 1193 struct g_consumer *cp; 1194 1195 LIST_FOREACH(cp, &pp->consumers, consumers) 1196 cp->flags |= G_CF_SPOILED; 1197 return (g_post_event(g_spoil_event, pp, flag, pp, NULL)); 1198 } 1199 1200 int 1201 g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len) 1202 { 1203 int error, i; 1204 1205 i = len; 1206 error = g_io_getattr(attr, cp, &i, var); 1207 if (error) 1208 return (error); 1209 if (i != len) 1210 return (EINVAL); 1211 return (0); 1212 } 1213 1214 static int 1215 g_get_device_prefix_len(const char *name) 1216 { 1217 int len; 1218 1219 if (strncmp(name, "ada", 3) == 0) 1220 len = 3; 1221 else if (strncmp(name, "ad", 2) == 0) 1222 len = 2; 1223 else 1224 return (0); 1225 if (name[len] < '' || name[len] > '9') 1226 return (0); 1227 do { 1228 len++; 1229 } while (name[len] >= '' && name[len] <= '9'); 1230 return (len); 1231 } 1232 1233 int 1234 g_compare_names(const char *namea, const char *nameb) 1235 { 1236 int deva, devb; 1237 1238 if (strcmp(namea, nameb) == 0) 1239 return (1); 1240 deva = g_get_device_prefix_len(namea); 1241 if (deva == 0) 1242 return (0); 1243 devb = g_get_device_prefix_len(nameb); 1244 if (devb == 0) 1245 return (0); 1246 if (strcmp(namea + deva, nameb + devb) == 0) 1247 return (1); 1248 return (0); 1249 } 1250 1251 #if defined(DIAGNOSTIC) || defined(DDB) 1252 /* 1253 * This function walks the mesh and returns a non-zero integer if it 1254 * finds the argument pointer is an object. The return value indicates 1255 * which type of object it is believed to be. If topology is not locked, 1256 * this function is potentially dangerous, but we don't assert that the 1257 * topology lock is held when called from debugger. 1258 */ 1259 int 1260 g_valid_obj(void const *ptr) 1261 { 1262 struct g_class *mp; 1263 struct g_geom *gp; 1264 struct g_consumer *cp; 1265 struct g_provider *pp; 1266 1267 #ifdef KDB 1268 if (kdb_active == 0) 1269 #endif 1270 g_topology_assert(); 1271 1272 LIST_FOREACH(mp, &g_classes, class) { 1273 if (ptr == mp) 1274 return (1); 1275 LIST_FOREACH(gp, &mp->geom, geom) { 1276 if (ptr == gp) 1277 return (2); 1278 LIST_FOREACH(cp, &gp->consumer, consumer) 1279 if (ptr == cp) 1280 return (3); 1281 LIST_FOREACH(pp, &gp->provider, provider) 1282 if (ptr == pp) 1283 return (4); 1284 } 1285 } 1286 return(0); 1287 } 1288 #endif 1289 1290 #ifdef DDB 1291 1292 #define gprintf(...) do { \ 1293 db_printf("%*s", indent, ""); \ 1294 db_printf(__VA_ARGS__); \ 1295 } while (0) 1296 #define gprintln(...) do { \ 1297 gprintf(__VA_ARGS__); \ 1298 db_printf("\n"); \ 1299 } while (0) 1300 1301 #define ADDFLAG(obj, flag, sflag) do { \ 1302 if ((obj)->flags & (flag)) { \ 1303 if (comma) \ 1304 strlcat(str, ",", size); \ 1305 strlcat(str, (sflag), size); \ 1306 comma = 1; \ 1307 } \ 1308 } while (0) 1309 1310 static char * 1311 provider_flags_to_string(struct g_provider *pp, char *str, size_t size) 1312 { 1313 int comma = 0; 1314 1315 bzero(str, size); 1316 if (pp->flags == 0) { 1317 strlcpy(str, "NONE", size); 1318 return (str); 1319 } 1320 ADDFLAG(pp, G_PF_WITHER, "G_PF_WITHER"); 1321 ADDFLAG(pp, G_PF_ORPHAN, "G_PF_ORPHAN"); 1322 return (str); 1323 } 1324 1325 static char * 1326 geom_flags_to_string(struct g_geom *gp, char *str, size_t size) 1327 { 1328 int comma = 0; 1329 1330 bzero(str, size); 1331 if (gp->flags == 0) { 1332 strlcpy(str, "NONE", size); 1333 return (str); 1334 } 1335 ADDFLAG(gp, G_GEOM_WITHER, "G_GEOM_WITHER"); 1336 return (str); 1337 } 1338 static void 1339 db_show_geom_consumer(int indent, struct g_consumer *cp) 1340 { 1341 1342 if (indent == 0) { 1343 gprintln("consumer: %p", cp); 1344 gprintln(" class: %s (%p)", cp->geom->class->name, 1345 cp->geom->class); 1346 gprintln(" geom: %s (%p)", cp->geom->name, cp->geom); 1347 if (cp->provider == NULL) 1348 gprintln(" provider: none"); 1349 else { 1350 gprintln(" provider: %s (%p)", cp->provider->name, 1351 cp->provider); 1352 } 1353 gprintln(" access: r%dw%de%d", cp->acr, cp->acw, cp->ace); 1354 gprintln(" flags: 0x%04x", cp->flags); 1355 gprintln(" nstart: %u", cp->nstart); 1356 gprintln(" nend: %u", cp->nend); 1357 } else { 1358 gprintf("consumer: %p (%s), access=r%dw%de%d", cp, 1359 cp->provider != NULL ? cp->provider->name : "none", 1360 cp->acr, cp->acw, cp->ace); 1361 if (cp->flags) 1362 db_printf(", flags=0x%04x", cp->flags); 1363 db_printf("\n"); 1364 } 1365 } 1366 1367 static void 1368 db_show_geom_provider(int indent, struct g_provider *pp) 1369 { 1370 struct g_consumer *cp; 1371 char flags[64]; 1372 1373 if (indent == 0) { 1374 gprintln("provider: %s (%p)", pp->name, pp); 1375 gprintln(" class: %s (%p)", pp->geom->class->name, 1376 pp->geom->class); 1377 gprintln(" geom: %s (%p)", pp->geom->name, pp->geom); 1378 gprintln(" mediasize: %jd", (intmax_t)pp->mediasize); 1379 gprintln(" sectorsize: %u", pp->sectorsize); 1380 gprintln(" stripesize: %u", pp->stripesize); 1381 gprintln(" stripeoffset: %u", pp->stripeoffset); 1382 gprintln(" access: r%dw%de%d", pp->acr, pp->acw, 1383 pp->ace); 1384 gprintln(" flags: %s (0x%04x)", 1385 provider_flags_to_string(pp, flags, sizeof(flags)), 1386 pp->flags); 1387 gprintln(" error: %d", pp->error); 1388 gprintln(" nstart: %u", pp->nstart); 1389 gprintln(" nend: %u", pp->nend); 1390 if (LIST_EMPTY(&pp->consumers)) 1391 gprintln(" consumers: none"); 1392 } else { 1393 gprintf("provider: %s (%p), access=r%dw%de%d", 1394 pp->name, pp, pp->acr, pp->acw, pp->ace); 1395 if (pp->flags != 0) { 1396 db_printf(", flags=%s (0x%04x)", 1397 provider_flags_to_string(pp, flags, sizeof(flags)), 1398 pp->flags); 1399 } 1400 db_printf("\n"); 1401 } 1402 if (!LIST_EMPTY(&pp->consumers)) { 1403 LIST_FOREACH(cp, &pp->consumers, consumers) { 1404 db_show_geom_consumer(indent + 2, cp); 1405 if (db_pager_quit) 1406 break; 1407 } 1408 } 1409 } 1410 1411 static void 1412 db_show_geom_geom(int indent, struct g_geom *gp) 1413 { 1414 struct g_provider *pp; 1415 struct g_consumer *cp; 1416 char flags[64]; 1417 1418 if (indent == 0) { 1419 gprintln("geom: %s (%p)", gp->name, gp); 1420 gprintln(" class: %s (%p)", gp->class->name, gp->class); 1421 gprintln(" flags: %s (0x%04x)", 1422 geom_flags_to_string(gp, flags, sizeof(flags)), gp->flags); 1423 gprintln(" rank: %d", gp->rank); 1424 if (LIST_EMPTY(&gp->provider)) 1425 gprintln(" providers: none"); 1426 if (LIST_EMPTY(&gp->consumer)) 1427 gprintln(" consumers: none"); 1428 } else { 1429 gprintf("geom: %s (%p), rank=%d", gp->name, gp, gp->rank); 1430 if (gp->flags != 0) { 1431 db_printf(", flags=%s (0x%04x)", 1432 geom_flags_to_string(gp, flags, sizeof(flags)), 1433 gp->flags); 1434 } 1435 db_printf("\n"); 1436 } 1437 if (!LIST_EMPTY(&gp->provider)) { 1438 LIST_FOREACH(pp, &gp->provider, provider) { 1439 db_show_geom_provider(indent + 2, pp); 1440 if (db_pager_quit) 1441 break; 1442 } 1443 } 1444 if (!LIST_EMPTY(&gp->consumer)) { 1445 LIST_FOREACH(cp, &gp->consumer, consumer) { 1446 db_show_geom_consumer(indent + 2, cp); 1447 if (db_pager_quit) 1448 break; 1449 } 1450 } 1451 } 1452 1453 static void 1454 db_show_geom_class(struct g_class *mp) 1455 { 1456 struct g_geom *gp; 1457 1458 db_printf("class: %s (%p)\n", mp->name, mp); 1459 LIST_FOREACH(gp, &mp->geom, geom) { 1460 db_show_geom_geom(2, gp); 1461 if (db_pager_quit) 1462 break; 1463 } 1464 } 1465 1466 /* 1467 * Print the GEOM topology or the given object. 1468 */ 1469 DB_SHOW_COMMAND(geom, db_show_geom) 1470 { 1471 struct g_class *mp; 1472 1473 if (!have_addr) { 1474 /* No address given, print the entire topology. */ 1475 LIST_FOREACH(mp, &g_classes, class) { 1476 db_show_geom_class(mp); 1477 db_printf("\n"); 1478 if (db_pager_quit) 1479 break; 1480 } 1481 } else { 1482 switch (g_valid_obj((void *)addr)) { 1483 case 1: 1484 db_show_geom_class((struct g_class *)addr); 1485 break; 1486 case 2: 1487 db_show_geom_geom(0, (struct g_geom *)addr); 1488 break; 1489 case 3: 1490 db_show_geom_consumer(0, (struct g_consumer *)addr); 1491 break; 1492 case 4: 1493 db_show_geom_provider(0, (struct g_provider *)addr); 1494 break; 1495 default: 1496 db_printf("Not a GEOM object.\n"); 1497 break; 1498 } 1499 } 1500 } 1501 1502 static void 1503 db_print_bio_cmd(struct bio *bp) 1504 { 1505 db_printf(" cmd: "); 1506 switch (bp->bio_cmd) { 1507 case BIO_READ: db_printf("BIO_READ"); break; 1508 case BIO_WRITE: db_printf("BIO_WRITE"); break; 1509 case BIO_DELETE: db_printf("BIO_DELETE"); break; 1510 case BIO_GETATTR: db_printf("BIO_GETATTR"); break; 1511 case BIO_FLUSH: db_printf("BIO_FLUSH"); break; 1512 case BIO_CMD0: db_printf("BIO_CMD0"); break; 1513 case BIO_CMD1: db_printf("BIO_CMD1"); break; 1514 case BIO_CMD2: db_printf("BIO_CMD2"); break; 1515 default: db_printf("UNKNOWN"); break; 1516 } 1517 db_printf("\n"); 1518 } 1519 1520 static void 1521 db_print_bio_flags(struct bio *bp) 1522 { 1523 int comma; 1524 1525 comma = 0; 1526 db_printf(" flags: "); 1527 if (bp->bio_flags & BIO_ERROR) { 1528 db_printf("BIO_ERROR"); 1529 comma = 1; 1530 } 1531 if (bp->bio_flags & BIO_DONE) { 1532 db_printf("%sBIO_DONE", (comma ? ", " : "")); 1533 comma = 1; 1534 } 1535 if (bp->bio_flags & BIO_ONQUEUE) 1536 db_printf("%sBIO_ONQUEUE", (comma ? ", " : "")); 1537 db_printf("\n"); 1538 } 1539 1540 /* 1541 * Print useful information in a BIO 1542 */ 1543 DB_SHOW_COMMAND(bio, db_show_bio) 1544 { 1545 struct bio *bp; 1546 1547 if (have_addr) { 1548 bp = (struct bio *)addr; 1549 db_printf("BIO %p\n", bp); 1550 db_print_bio_cmd(bp); 1551 db_print_bio_flags(bp); 1552 db_printf(" cflags: 0x%hhx\n", bp->bio_cflags); 1553 db_printf(" pflags: 0x%hhx\n", bp->bio_pflags); 1554 db_printf(" offset: %jd\n", (intmax_t)bp->bio_offset); 1555 db_printf(" length: %jd\n", (intmax_t)bp->bio_length); 1556 db_printf(" bcount: %ld\n", bp->bio_bcount); 1557 db_printf(" resid: %ld\n", bp->bio_resid); 1558 db_printf(" completed: %jd\n", (intmax_t)bp->bio_completed); 1559 db_printf(" children: %u\n", bp->bio_children); 1560 db_printf(" inbed: %u\n", bp->bio_inbed); 1561 db_printf(" error: %d\n", bp->bio_error); 1562 db_printf(" parent: %p\n", bp->bio_parent); 1563 db_printf(" driver1: %p\n", bp->bio_driver1); 1564 db_printf(" driver2: %p\n", bp->bio_driver2); 1565 db_printf(" caller1: %p\n", bp->bio_caller1); 1566 db_printf(" caller2: %p\n", bp->bio_caller2); 1567 db_printf(" bio_from: %p\n", bp->bio_from); 1568 db_printf(" bio_to: %p\n", bp->bio_to); 1569 } 1570 } 1571 1572 #undef gprintf 1573 #undef gprintln 1574 #undef ADDFLAG 1575 1576 #endif /* DDB */
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