geom_subr.c revision 125802
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: head/sys/geom/geom_subr.c 125802 2004-02-14 17:58:57Z phk $"); 38 39#include <sys/param.h> 40#include <sys/systm.h> 41#include <sys/devicestat.h> 42#include <sys/kernel.h> 43#include <sys/malloc.h> 44#include <sys/bio.h> 45#include <sys/sysctl.h> 46#include <sys/proc.h> 47#include <sys/kthread.h> 48#include <sys/lock.h> 49#include <sys/mutex.h> 50#include <sys/errno.h> 51#include <sys/sbuf.h> 52#include <geom/geom.h> 53#include <geom/geom_int.h> 54#include <machine/stdarg.h> 55 56struct class_list_head g_classes = LIST_HEAD_INITIALIZER(g_classes); 57static struct g_tailq_head geoms = TAILQ_HEAD_INITIALIZER(geoms); 58char *g_wait_event, *g_wait_up, *g_wait_down, *g_wait_sim; 59 60static int g_valid_obj(void const *ptr); 61 62struct g_hh00 { 63 struct g_class *mp; 64 int error; 65}; 66 67/* 68 * This event offers a new class a chance to taste all preexisting providers. 69 */ 70static void 71g_load_class(void *arg, int flag) 72{ 73 struct g_hh00 *hh; 74 struct g_class *mp2, *mp; 75 struct g_geom *gp; 76 struct g_provider *pp; 77 78 g_topology_assert(); 79 if (flag == EV_CANCEL) /* XXX: can't happen ? */ 80 return; 81 if (g_shutdown) 82 return; 83 84 hh = arg; 85 mp = hh->mp; 86 g_free(hh); 87 g_trace(G_T_TOPOLOGY, "g_load_class(%s)", mp->name); 88 KASSERT(mp->name != NULL && *mp->name != '\0', 89 ("GEOM class has no name")); 90 LIST_FOREACH(mp2, &g_classes, class) { 91 KASSERT(mp2 != mp, 92 ("The GEOM class %s already loaded", mp2->name)); 93 KASSERT(strcmp(mp2->name, mp->name) != 0, 94 ("A GEOM class named %s is already loaded", mp2->name)); 95 } 96 97 LIST_INIT(&mp->geom); 98 LIST_INSERT_HEAD(&g_classes, mp, class); 99 if (mp->init != NULL) 100 mp->init(mp); 101 if (mp->taste == NULL) 102 return; 103 LIST_FOREACH(mp2, &g_classes, class) { 104 if (mp == mp2) 105 continue; 106 LIST_FOREACH(gp, &mp2->geom, geom) { 107 LIST_FOREACH(pp, &gp->provider, provider) { 108 mp->taste(mp, pp, 0); 109 g_topology_assert(); 110 } 111 } 112 } 113} 114 115static void 116g_unload_class(void *arg, int flag) 117{ 118 struct g_hh00 *hh; 119 struct g_class *mp; 120 struct g_geom *gp; 121 struct g_provider *pp; 122 struct g_consumer *cp; 123 int error; 124 125 g_topology_assert(); 126 hh = arg; 127 mp = hh->mp; 128 g_trace(G_T_TOPOLOGY, "g_unload_class(%s)", mp->name); 129 130 /* 131 * We allow unloading if we have no geoms, or a class 132 * method we can use to get rid of them. 133 */ 134 if (!LIST_EMPTY(&mp->geom) && mp->destroy_geom == NULL) { 135 hh->error = EOPNOTSUPP; 136 return; 137 } 138 139 /* We refuse to unload if anything is open */ 140 LIST_FOREACH(gp, &mp->geom, geom) { 141 LIST_FOREACH(pp, &gp->provider, provider) 142 if (pp->acr || pp->acw || pp->ace) { 143 hh->error = EBUSY; 144 return; 145 } 146 LIST_FOREACH(cp, &gp->consumer, consumer) 147 if (cp->acr || cp->acw || cp->ace) { 148 hh->error = EBUSY; 149 return; 150 } 151 } 152 153 /* Bar new entries */ 154 mp->taste = NULL; 155 mp->config = NULL; 156 157 error = 0; 158 LIST_FOREACH(gp, &mp->geom, geom) { 159 error = mp->destroy_geom(NULL, mp, gp); 160 if (error != 0) 161 break; 162 } 163 if (error == 0) { 164 if (mp->fini != NULL) 165 mp->fini(mp); 166 LIST_REMOVE(mp, class); 167 } 168 hh->error = error; 169 return; 170} 171 172int 173g_modevent(module_t mod, int type, void *data) 174{ 175 struct g_hh00 *hh; 176 int error; 177 static int g_ignition; 178 179 if (!g_ignition) { 180 g_ignition++; 181 g_init(); 182 } 183 hh = g_malloc(sizeof *hh, M_WAITOK | M_ZERO); 184 hh->mp = data; 185 error = EOPNOTSUPP; 186 switch (type) { 187 case MOD_LOAD: 188 g_trace(G_T_TOPOLOGY, "g_modevent(%s, LOAD)", hh->mp->name); 189 g_post_event(g_load_class, hh, M_WAITOK, NULL); 190 error = 0; 191 break; 192 case MOD_UNLOAD: 193 g_trace(G_T_TOPOLOGY, "g_modevent(%s, UNLOAD)", hh->mp->name); 194 error = g_waitfor_event(g_unload_class, hh, M_WAITOK, NULL); 195 if (error == 0) 196 error = hh->error; 197 if (error == 0) { 198 g_waitidle(); 199 KASSERT(LIST_EMPTY(&hh->mp->geom), 200 ("Unloaded class (%s) still has geom", hh->mp->name)); 201 } 202 g_free(hh); 203 break; 204 default: 205 g_free(hh); 206 break; 207 } 208 return (error); 209} 210 211struct g_geom * 212g_new_geomf(struct g_class *mp, const char *fmt, ...) 213{ 214 struct g_geom *gp; 215 va_list ap; 216 struct sbuf *sb; 217 218 g_topology_assert(); 219 KASSERT(g_valid_obj(mp), ("g_new_geom_f() on alien class %p", mp)); 220 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 221 va_start(ap, fmt); 222 sbuf_vprintf(sb, fmt, ap); 223 va_end(ap); 224 sbuf_finish(sb); 225 gp = g_malloc(sizeof *gp, M_WAITOK | M_ZERO); 226 gp->name = g_malloc(sbuf_len(sb) + 1, M_WAITOK | M_ZERO); 227 gp->class = mp; 228 gp->rank = 1; 229 LIST_INIT(&gp->consumer); 230 LIST_INIT(&gp->provider); 231 LIST_INSERT_HEAD(&mp->geom, gp, geom); 232 TAILQ_INSERT_HEAD(&geoms, gp, geoms); 233 strcpy(gp->name, sbuf_data(sb)); 234 sbuf_delete(sb); 235 return (gp); 236} 237 238void 239g_destroy_geom(struct g_geom *gp) 240{ 241 242 g_trace(G_T_TOPOLOGY, "g_destroy_geom(%p(%s))", gp, gp->name); 243 g_topology_assert(); 244 KASSERT(LIST_EMPTY(&gp->consumer), 245 ("g_destroy_geom(%s) with consumer(s) [%p]", 246 gp->name, LIST_FIRST(&gp->consumer))); 247 KASSERT(LIST_EMPTY(&gp->provider), 248 ("g_destroy_geom(%s) with provider(s) [%p]", 249 gp->name, LIST_FIRST(&gp->provider))); 250 g_cancel_event(gp); 251 LIST_REMOVE(gp, geom); 252 TAILQ_REMOVE(&geoms, gp, geoms); 253 g_free(gp->name); 254 g_free(gp); 255} 256 257/* 258 * This function is called (repeatedly) until has withered away. 259 */ 260void 261g_wither_geom(struct g_geom *gp, int error) 262{ 263 struct g_provider *pp, *pp2; 264 struct g_consumer *cp, *cp2; 265 static int once_is_enough; 266 267 if (once_is_enough) 268 return; 269 once_is_enough = 1; 270 g_trace(G_T_TOPOLOGY, "g_wither_geom(%p(%s))", gp, gp->name); 271 g_topology_assert(); 272 if (!(gp->flags & G_GEOM_WITHER)) { 273 gp->flags |= G_GEOM_WITHER; 274 LIST_FOREACH(pp, &gp->provider, provider) 275 g_orphan_provider(pp, error); 276 } 277 for (pp = LIST_FIRST(&gp->provider); pp != NULL; pp = pp2) { 278 pp2 = LIST_NEXT(pp, provider); 279 if (!LIST_EMPTY(&pp->consumers)) 280 continue; 281 g_destroy_provider(pp); 282 } 283 for (cp = LIST_FIRST(&gp->consumer); cp != NULL; cp = cp2) { 284 cp2 = LIST_NEXT(cp, consumer); 285 if (cp->acr || cp->acw || cp->ace) 286 continue; 287 g_detach(cp); 288 g_destroy_consumer(cp); 289 } 290 if (LIST_EMPTY(&gp->provider) && LIST_EMPTY(&gp->consumer)) 291 g_destroy_geom(gp); 292 once_is_enough = 0; 293} 294 295struct g_consumer * 296g_new_consumer(struct g_geom *gp) 297{ 298 struct g_consumer *cp; 299 300 g_topology_assert(); 301 KASSERT(!(gp->flags & G_GEOM_WITHER), 302 ("g_new_consumer on WITHERing geom(%s) (class %s)", 303 gp->name, gp->class->name)); 304 KASSERT(gp->orphan != NULL, 305 ("g_new_consumer on geom(%s) (class %s) without orphan", 306 gp->name, gp->class->name)); 307 308 cp = g_malloc(sizeof *cp, M_WAITOK | M_ZERO); 309 cp->geom = gp; 310 cp->stat = devstat_new_entry(cp, -1, 0, DEVSTAT_ALL_SUPPORTED, 311 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 312 LIST_INSERT_HEAD(&gp->consumer, cp, consumer); 313 return(cp); 314} 315 316void 317g_destroy_consumer(struct g_consumer *cp) 318{ 319 struct g_geom *gp; 320 321 g_trace(G_T_TOPOLOGY, "g_destroy_consumer(%p)", cp); 322 g_topology_assert(); 323 KASSERT (cp->provider == NULL, ("g_destroy_consumer but attached")); 324 KASSERT (cp->acr == 0, ("g_destroy_consumer with acr")); 325 KASSERT (cp->acw == 0, ("g_destroy_consumer with acw")); 326 KASSERT (cp->ace == 0, ("g_destroy_consumer with ace")); 327 g_cancel_event(cp); 328 gp = cp->geom; 329 LIST_REMOVE(cp, consumer); 330 devstat_remove_entry(cp->stat); 331 g_free(cp); 332 if (gp->flags & G_GEOM_WITHER) 333 g_wither_geom(gp, 0); 334} 335 336static void 337g_new_provider_event(void *arg, int flag) 338{ 339 struct g_class *mp; 340 struct g_provider *pp; 341 struct g_consumer *cp; 342 int i; 343 344 g_topology_assert(); 345 if (flag == EV_CANCEL) 346 return; 347 if (g_shutdown) 348 return; 349 pp = arg; 350 LIST_FOREACH(mp, &g_classes, class) { 351 if (mp->taste == NULL) 352 continue; 353 i = 1; 354 LIST_FOREACH(cp, &pp->consumers, consumers) 355 if (cp->geom->class == mp) 356 i = 0; 357 if (!i) 358 continue; 359 mp->taste(mp, pp, 0); 360 g_topology_assert(); 361 /* 362 * XXX: Bandaid for 5.2-RELEASE 363 * XXX: DO NOT REPLICATE THIS CODE! 364 */ 365 if (!g_valid_obj(pp)) { 366 printf("g_provider %p disappeared while tasting\n", pp); 367 return; 368 } 369 } 370} 371 372 373struct g_provider * 374g_new_providerf(struct g_geom *gp, const char *fmt, ...) 375{ 376 struct g_provider *pp; 377 struct sbuf *sb; 378 va_list ap; 379 380 g_topology_assert(); 381 KASSERT(gp->start != NULL, 382 ("new provider on geom(%s) without ->start (class %s)", 383 gp->name, gp->class->name)); 384 KASSERT(!(gp->flags & G_GEOM_WITHER), 385 ("new provider on WITHERing geom(%s) (class %s)", 386 gp->name, gp->class->name)); 387 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 388 va_start(ap, fmt); 389 sbuf_vprintf(sb, fmt, ap); 390 va_end(ap); 391 sbuf_finish(sb); 392 pp = g_malloc(sizeof *pp + sbuf_len(sb) + 1, M_WAITOK | M_ZERO); 393 pp->name = (char *)(pp + 1); 394 strcpy(pp->name, sbuf_data(sb)); 395 sbuf_delete(sb); 396 LIST_INIT(&pp->consumers); 397 pp->error = ENXIO; 398 pp->geom = gp; 399 pp->stat = devstat_new_entry(pp, -1, 0, DEVSTAT_ALL_SUPPORTED, 400 DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 401 LIST_INSERT_HEAD(&gp->provider, pp, provider); 402 g_post_event(g_new_provider_event, pp, M_WAITOK, pp, NULL); 403 return (pp); 404} 405 406void 407g_error_provider(struct g_provider *pp, int error) 408{ 409 410 pp->error = error; 411} 412 413struct g_provider * 414g_provider_by_name(char const *arg) 415{ 416 struct g_class *cp; 417 struct g_geom *gp; 418 struct g_provider *pp; 419 420 LIST_FOREACH(cp, &g_classes, class) { 421 LIST_FOREACH(gp, &cp->geom, geom) { 422 LIST_FOREACH(pp, &gp->provider, provider) { 423 if (!strcmp(arg, pp->name)) 424 return (pp); 425 } 426 } 427 } 428 return (NULL); 429} 430 431void 432g_destroy_provider(struct g_provider *pp) 433{ 434 struct g_geom *gp; 435 436 g_topology_assert(); 437 KASSERT(LIST_EMPTY(&pp->consumers), 438 ("g_destroy_provider but attached")); 439 KASSERT (pp->acr == 0, ("g_destroy_provider with acr")); 440 KASSERT (pp->acw == 0, ("g_destroy_provider with acw")); 441 KASSERT (pp->acw == 0, ("g_destroy_provider with ace")); 442 g_cancel_event(pp); 443 LIST_REMOVE(pp, provider); 444 gp = pp->geom; 445 devstat_remove_entry(pp->stat); 446 g_free(pp); 447 if ((gp->flags & G_GEOM_WITHER)) 448 g_wither_geom(gp, 0); 449} 450 451/* 452 * We keep the "geoms" list sorted by topological order (== increasing 453 * numerical rank) at all times. 454 * When an attach is done, the attaching geoms rank is invalidated 455 * and it is moved to the tail of the list. 456 * All geoms later in the sequence has their ranks reevaluated in 457 * sequence. If we cannot assign rank to a geom because it's 458 * prerequisites do not have rank, we move that element to the tail 459 * of the sequence with invalid rank as well. 460 * At some point we encounter our original geom and if we stil fail 461 * to assign it a rank, there must be a loop and we fail back to 462 * g_attach() which detach again and calls redo_rank again 463 * to fix up the damage. 464 * It would be much simpler code wise to do it recursively, but we 465 * can't risk that on the kernel stack. 466 */ 467 468static int 469redo_rank(struct g_geom *gp) 470{ 471 struct g_consumer *cp; 472 struct g_geom *gp1, *gp2; 473 int n, m; 474 475 g_topology_assert(); 476 477 /* Invalidate this geoms rank and move it to the tail */ 478 gp1 = TAILQ_NEXT(gp, geoms); 479 if (gp1 != NULL) { 480 gp->rank = 0; 481 TAILQ_REMOVE(&geoms, gp, geoms); 482 TAILQ_INSERT_TAIL(&geoms, gp, geoms); 483 } else { 484 gp1 = gp; 485 } 486 487 /* re-rank the rest of the sequence */ 488 for (; gp1 != NULL; gp1 = gp2) { 489 gp1->rank = 0; 490 m = 1; 491 LIST_FOREACH(cp, &gp1->consumer, consumer) { 492 if (cp->provider == NULL) 493 continue; 494 n = cp->provider->geom->rank; 495 if (n == 0) { 496 m = 0; 497 break; 498 } else if (n >= m) 499 m = n + 1; 500 } 501 gp1->rank = m; 502 gp2 = TAILQ_NEXT(gp1, geoms); 503 504 /* got a rank, moving on */ 505 if (m != 0) 506 continue; 507 508 /* no rank to original geom means loop */ 509 if (gp == gp1) 510 return (ELOOP); 511 512 /* no rank, put it at the end move on */ 513 TAILQ_REMOVE(&geoms, gp1, geoms); 514 TAILQ_INSERT_TAIL(&geoms, gp1, geoms); 515 } 516 return (0); 517} 518 519int 520g_attach(struct g_consumer *cp, struct g_provider *pp) 521{ 522 int error; 523 524 g_topology_assert(); 525 KASSERT(cp->provider == NULL, ("attach but attached")); 526 cp->provider = pp; 527 LIST_INSERT_HEAD(&pp->consumers, cp, consumers); 528 error = redo_rank(cp->geom); 529 if (error) { 530 LIST_REMOVE(cp, consumers); 531 cp->provider = NULL; 532 redo_rank(cp->geom); 533 } 534 return (error); 535} 536 537void 538g_detach(struct g_consumer *cp) 539{ 540 struct g_provider *pp; 541 542 g_trace(G_T_TOPOLOGY, "g_detach(%p)", cp); 543 KASSERT(cp != (void*)0xd0d0d0d0, ("ARGH!")); 544 g_topology_assert(); 545 KASSERT(cp->provider != NULL, ("detach but not attached")); 546 KASSERT(cp->acr == 0, ("detach but nonzero acr")); 547 KASSERT(cp->acw == 0, ("detach but nonzero acw")); 548 KASSERT(cp->ace == 0, ("detach but nonzero ace")); 549 KASSERT(cp->nstart == cp->nend, 550 ("detach with active requests")); 551 pp = cp->provider; 552 LIST_REMOVE(cp, consumers); 553 cp->provider = NULL; 554 if (pp->geom->flags & G_GEOM_WITHER) 555 g_wither_geom(pp->geom, 0); 556 else if (pp->flags & G_PF_WITHER) 557 g_destroy_provider(pp); 558 redo_rank(cp->geom); 559} 560 561/* 562 * g_access() 563 * 564 * Access-check with delta values. The question asked is "can provider 565 * "cp" change the access counters by the relative amounts dc[rwe] ?" 566 */ 567 568int 569g_access(struct g_consumer *cp, int dcr, int dcw, int dce) 570{ 571 struct g_provider *pp; 572 int pr,pw,pe; 573 int error; 574 575 pp = cp->provider; 576 577 g_trace(G_T_ACCESS, "g_access(%p(%s), %d, %d, %d)", 578 cp, pp->name, dcr, dcw, dce); 579 580 g_topology_assert(); 581 KASSERT(cp->provider != NULL, ("access but not attached")); 582 KASSERT(cp->acr + dcr >= 0, ("access resulting in negative acr")); 583 KASSERT(cp->acw + dcw >= 0, ("access resulting in negative acw")); 584 KASSERT(cp->ace + dce >= 0, ("access resulting in negative ace")); 585 KASSERT(dcr != 0 || dcw != 0 || dce != 0, ("NOP access request")); 586 KASSERT(pp->geom->access != NULL, ("NULL geom->access")); 587 588 /* 589 * If our class cares about being spoiled, and we have been, we 590 * are probably just ahead of the event telling us that. Fail 591 * now rather than having to unravel this later. 592 */ 593 if (cp->geom->spoiled != NULL && cp->spoiled) { 594 KASSERT(dcr <= 0, ("spoiled but dcr = %d", dcr)); 595 KASSERT(dcw <= 0, ("spoiled but dcw = %d", dcw)); 596 KASSERT(dce <= 0, ("spoiled but dce = %d", dce)); 597 } 598 599 /* 600 * Figure out what counts the provider would have had, if this 601 * consumer had (r0w0e0) at this time. 602 */ 603 pr = pp->acr - cp->acr; 604 pw = pp->acw - cp->acw; 605 pe = pp->ace - cp->ace; 606 607 g_trace(G_T_ACCESS, 608 "open delta:[r%dw%de%d] old:[r%dw%de%d] provider:[r%dw%de%d] %p(%s)", 609 dcr, dcw, dce, 610 cp->acr, cp->acw, cp->ace, 611 pp->acr, pp->acw, pp->ace, 612 pp, pp->name); 613 614 /* If foot-shooting is enabled, any open on rank#1 is OK */ 615 if ((g_debugflags & 16) && pp->geom->rank == 1) 616 ; 617 /* If we try exclusive but already write: fail */ 618 else if (dce > 0 && pw > 0) 619 return (EPERM); 620 /* If we try write but already exclusive: fail */ 621 else if (dcw > 0 && pe > 0) 622 return (EPERM); 623 /* If we try to open more but provider is error'ed: fail */ 624 else if ((dcr > 0 || dcw > 0 || dce > 0) && pp->error != 0) 625 return (pp->error); 626 627 /* Ok then... */ 628 629 error = pp->geom->access(pp, dcr, dcw, dce); 630 KASSERT(dcr > 0 || dcw > 0 || dce > 0 || error == 0, 631 ("Geom provider %s::%s failed closing ->access()", 632 pp->geom->class->name, pp->name)); 633 if (!error) { 634 /* 635 * If we open first write, spoil any partner consumers. 636 * If we close last write, trigger re-taste. 637 */ 638 if (pp->acw == 0 && dcw != 0) 639 g_spoil(pp, cp); 640 else if (pp->acw != 0 && pp->acw == -dcw && 641 !(pp->geom->flags & G_GEOM_WITHER)) 642 g_post_event(g_new_provider_event, pp, M_WAITOK, 643 pp, NULL); 644 645 pp->acr += dcr; 646 pp->acw += dcw; 647 pp->ace += dce; 648 cp->acr += dcr; 649 cp->acw += dcw; 650 cp->ace += dce; 651 } 652 return (error); 653} 654 655int 656g_handleattr_int(struct bio *bp, const char *attribute, int val) 657{ 658 659 return (g_handleattr(bp, attribute, &val, sizeof val)); 660} 661 662int 663g_handleattr_off_t(struct bio *bp, const char *attribute, off_t val) 664{ 665 666 return (g_handleattr(bp, attribute, &val, sizeof val)); 667} 668 669int 670g_handleattr(struct bio *bp, const char *attribute, void *val, int len) 671{ 672 int error; 673 674 if (strcmp(bp->bio_attribute, attribute)) 675 return (0); 676 if (bp->bio_length != len) { 677 printf("bio_length %jd len %d -> EFAULT\n", 678 (intmax_t)bp->bio_length, len); 679 error = EFAULT; 680 } else { 681 error = 0; 682 bcopy(val, bp->bio_data, len); 683 bp->bio_completed = len; 684 } 685 g_io_deliver(bp, error); 686 return (1); 687} 688 689int 690g_std_access(struct g_provider *pp __unused, 691 int dr __unused, int dw __unused, int de __unused) 692{ 693 694 return (0); 695} 696 697void 698g_std_done(struct bio *bp) 699{ 700 struct bio *bp2; 701 702 bp2 = bp->bio_parent; 703 if (bp2->bio_error == 0) 704 bp2->bio_error = bp->bio_error; 705 bp2->bio_completed += bp->bio_completed; 706 g_destroy_bio(bp); 707 bp2->bio_inbed++; 708 if (bp2->bio_children == bp2->bio_inbed) 709 g_io_deliver(bp2, bp2->bio_error); 710} 711 712/* XXX: maybe this is only g_slice_spoiled */ 713 714void 715g_std_spoiled(struct g_consumer *cp) 716{ 717 struct g_geom *gp; 718 struct g_provider *pp; 719 720 g_trace(G_T_TOPOLOGY, "g_std_spoiled(%p)", cp); 721 g_topology_assert(); 722 g_detach(cp); 723 gp = cp->geom; 724 LIST_FOREACH(pp, &gp->provider, provider) 725 g_orphan_provider(pp, ENXIO); 726 g_destroy_consumer(cp); 727 if (LIST_EMPTY(&gp->provider) && LIST_EMPTY(&gp->consumer)) 728 g_destroy_geom(gp); 729 else 730 gp->flags |= G_GEOM_WITHER; 731} 732 733/* 734 * Spoiling happens when a provider is opened for writing, but consumers 735 * which are configured by in-band data are attached (slicers for instance). 736 * Since the write might potentially change the in-band data, such consumers 737 * need to re-evaluate their existence after the writing session closes. 738 * We do this by (offering to) tear them down when the open for write happens 739 * in return for a re-taste when it closes again. 740 * Together with the fact that such consumers grab an 'e' bit whenever they 741 * are open, regardless of mode, this ends up DTRT. 742 */ 743 744static void 745g_spoil_event(void *arg, int flag) 746{ 747 struct g_provider *pp; 748 struct g_consumer *cp, *cp2; 749 750 g_topology_assert(); 751 if (flag == EV_CANCEL) 752 return; 753 pp = arg; 754 for (cp = LIST_FIRST(&pp->consumers); cp != NULL; cp = cp2) { 755 cp2 = LIST_NEXT(cp, consumers); 756 if (!cp->spoiled) 757 continue; 758 cp->spoiled = 0; 759 if (cp->geom->spoiled == NULL) 760 continue; 761 cp->geom->spoiled(cp); 762 g_topology_assert(); 763 } 764} 765 766void 767g_spoil(struct g_provider *pp, struct g_consumer *cp) 768{ 769 struct g_consumer *cp2; 770 771 g_topology_assert(); 772 773 LIST_FOREACH(cp2, &pp->consumers, consumers) { 774 if (cp2 == cp) 775 continue; 776/* 777 KASSERT(cp2->acr == 0, ("spoiling cp->acr = %d", cp2->acr)); 778 KASSERT(cp2->acw == 0, ("spoiling cp->acw = %d", cp2->acw)); 779*/ 780 KASSERT(cp2->ace == 0, ("spoiling cp->ace = %d", cp2->ace)); 781 cp2->spoiled++; 782 } 783 g_post_event(g_spoil_event, pp, M_WAITOK, pp, NULL); 784} 785 786int 787g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len) 788{ 789 int error, i; 790 791 i = len; 792 error = g_io_getattr(attr, cp, &i, var); 793 if (error) 794 return (error); 795 if (i != len) 796 return (EINVAL); 797 return (0); 798} 799 800/* 801 * XXX: Bandaid for 5.2. 802 * XXX: DO NOT EVEN THINK ABOUT CALLING THIS FUNCTION! 803 */ 804static int 805g_valid_obj(void const *ptr) 806{ 807 struct g_class *mp; 808 struct g_geom *gp; 809 struct g_consumer *cp; 810 struct g_provider *pp; 811 812 g_topology_assert(); 813 LIST_FOREACH(mp, &g_classes, class) { 814 if (ptr == mp) 815 return (1); 816 LIST_FOREACH(gp, &mp->geom, geom) { 817 if (ptr == gp) 818 return (1); 819 LIST_FOREACH(cp, &gp->consumer, consumer) 820 if (ptr == cp) 821 return (1); 822 LIST_FOREACH(pp, &gp->provider, provider) 823 if (ptr == pp) 824 return (1); 825 } 826 } 827 return(0); 828} 829 830/* 831 * Check if the given pointer is a live object 832 */ 833 834void 835g_sanity(void const *ptr) 836{ 837 struct g_class *mp; 838 struct g_geom *gp; 839 struct g_consumer *cp; 840 struct g_provider *pp; 841 842 if (!(g_debugflags & 0x8)) 843 return; 844 LIST_FOREACH(mp, &g_classes, class) { 845 KASSERT(mp != ptr, ("Ptr is live class")); 846 LIST_FOREACH(gp, &mp->geom, geom) { 847 KASSERT(gp != ptr, ("Ptr is live geom")); 848 KASSERT(gp->name != ptr, ("Ptr is live geom's name")); 849 LIST_FOREACH(cp, &gp->consumer, consumer) { 850 KASSERT(cp != ptr, ("Ptr is live consumer")); 851 } 852 LIST_FOREACH(pp, &gp->provider, provider) { 853 KASSERT(pp != ptr, ("Ptr is live provider")); 854 } 855 } 856 } 857} 858 859