geom_subr.c revision 105550
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 * $FreeBSD: head/sys/geom/geom_subr.c 105550 2002-10-20 20:08:44Z phk $ 36 */ 37 38 39#include <sys/param.h> 40#include <sys/stdint.h> 41#ifndef _KERNEL 42#include <stdio.h> 43#include <unistd.h> 44#include <stdlib.h> 45#include <signal.h> 46#include <string.h> 47#include <err.h> 48#else 49#include <sys/systm.h> 50#include <sys/kernel.h> 51#include <sys/malloc.h> 52#include <sys/bio.h> 53#include <sys/sysctl.h> 54#include <sys/proc.h> 55#include <sys/kthread.h> 56#include <sys/lock.h> 57#include <sys/mutex.h> 58#endif 59#include <sys/errno.h> 60#include <sys/sbuf.h> 61#include <geom/geom.h> 62#include <geom/geom_int.h> 63#include <machine/stdarg.h> 64 65struct class_list_head g_classes = LIST_HEAD_INITIALIZER(g_classes); 66static struct g_tailq_head geoms = TAILQ_HEAD_INITIALIZER(geoms); 67static int g_nproviders; 68char *g_wait_event, *g_wait_up, *g_wait_down, *g_wait_sim; 69 70static int g_ignition; 71 72void 73g_add_class(struct g_class *mp) 74{ 75 76 if (!g_ignition) { 77 g_ignition++; 78 g_init(); 79 } 80 mp->protect = 0x020016600; 81 g_topology_lock(); 82 g_trace(G_T_TOPOLOGY, "g_add_class(%s)", mp->name); 83 LIST_INIT(&mp->geom); 84 LIST_INSERT_HEAD(&g_classes, mp, class); 85 if (g_nproviders > 0) 86 g_post_event(EV_NEW_CLASS, mp, NULL, NULL, NULL); 87 g_topology_unlock(); 88} 89 90struct g_geom * 91g_new_geomf(struct g_class *mp, char *fmt, ...) 92{ 93 struct g_geom *gp; 94 va_list ap; 95 struct sbuf *sb; 96 97 g_topology_assert(); 98 va_start(ap, fmt); 99 mtx_lock(&Giant); 100 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 101 sbuf_vprintf(sb, fmt, ap); 102 sbuf_finish(sb); 103 mtx_unlock(&Giant); 104 gp = g_malloc(sizeof *gp, M_WAITOK | M_ZERO); 105 gp->protect = 0x020016601; 106 gp->name = g_malloc(sbuf_len(sb) + 1, M_WAITOK | M_ZERO); 107 gp->class = mp; 108 gp->rank = 1; 109 LIST_INIT(&gp->consumer); 110 LIST_INIT(&gp->provider); 111 LIST_INSERT_HEAD(&mp->geom, gp, geom); 112 TAILQ_INSERT_HEAD(&geoms, gp, geoms); 113 strcpy(gp->name, sbuf_data(sb)); 114 sbuf_delete(sb); 115 return (gp); 116} 117 118void 119g_destroy_geom(struct g_geom *gp) 120{ 121 122 g_trace(G_T_TOPOLOGY, "g_destroy_geom(%p(%s))", gp, gp->name); 123 g_topology_assert(); 124 KASSERT(gp->event == NULL, ("g_destroy_geom() with event")); 125 KASSERT(LIST_EMPTY(&gp->consumer), 126 ("g_destroy_geom(%s) with consumer(s) [%p]", 127 gp->name, LIST_FIRST(&gp->consumer))); 128 KASSERT(LIST_EMPTY(&gp->provider), 129 ("g_destroy_geom(%s) with provider(s) [%p]", 130 gp->name, LIST_FIRST(&gp->consumer))); 131 LIST_REMOVE(gp, geom); 132 TAILQ_REMOVE(&geoms, gp, geoms); 133 g_free(gp->name); 134 g_free(gp); 135} 136 137struct g_consumer * 138g_new_consumer(struct g_geom *gp) 139{ 140 struct g_consumer *cp; 141 142 g_topology_assert(); 143 KASSERT(gp->orphan != NULL, 144 ("g_new_consumer on geom(%s) (class %s) without orphan", 145 gp->name, gp->class->name)); 146 147 cp = g_malloc(sizeof *cp, M_WAITOK | M_ZERO); 148 cp->protect = 0x020016602; 149 cp->geom = gp; 150 LIST_INSERT_HEAD(&gp->consumer, cp, consumer); 151 return(cp); 152} 153 154void 155g_destroy_consumer(struct g_consumer *cp) 156{ 157 158 g_trace(G_T_TOPOLOGY, "g_destroy_consumer(%p)", cp); 159 g_topology_assert(); 160 KASSERT(cp->event == NULL, ("g_destroy_consumer() with event")); 161 KASSERT (cp->provider == NULL, ("g_destroy_consumer but attached")); 162 KASSERT (cp->acr == 0, ("g_destroy_consumer with acr")); 163 KASSERT (cp->acw == 0, ("g_destroy_consumer with acw")); 164 KASSERT (cp->ace == 0, ("g_destroy_consumer with ace")); 165 LIST_REMOVE(cp, consumer); 166 g_free(cp); 167} 168 169struct g_provider * 170g_new_providerf(struct g_geom *gp, char *fmt, ...) 171{ 172 struct g_provider *pp; 173 struct sbuf *sb; 174 va_list ap; 175 176 g_topology_assert(); 177 va_start(ap, fmt); 178 mtx_lock(&Giant); 179 sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 180 sbuf_vprintf(sb, fmt, ap); 181 sbuf_finish(sb); 182 mtx_unlock(&Giant); 183 pp = g_malloc(sizeof *pp + sbuf_len(sb) + 1, M_WAITOK | M_ZERO); 184 pp->protect = 0x020016603; 185 pp->name = (char *)(pp + 1); 186 strcpy(pp->name, sbuf_data(sb)); 187 sbuf_delete(sb); 188 LIST_INIT(&pp->consumers); 189 pp->error = ENXIO; 190 pp->geom = gp; 191 LIST_INSERT_HEAD(&gp->provider, pp, provider); 192 g_nproviders++; 193 g_post_event(EV_NEW_PROVIDER, NULL, NULL, pp, NULL); 194 return (pp); 195} 196 197void 198g_error_provider(struct g_provider *pp, int error) 199{ 200 201 pp->error = error; 202} 203 204 205void 206g_destroy_provider(struct g_provider *pp) 207{ 208 struct g_geom *gp; 209 struct g_consumer *cp; 210 211 g_topology_assert(); 212 KASSERT(pp->event == NULL, ("g_destroy_provider() with event")); 213 KASSERT(LIST_EMPTY(&pp->consumers), 214 ("g_destroy_provider but attached")); 215 KASSERT (pp->acr == 0, ("g_destroy_provider with acr")); 216 KASSERT (pp->acw == 0, ("g_destroy_provider with acw")); 217 KASSERT (pp->acw == 0, ("g_destroy_provider with ace")); 218 g_nproviders--; 219 LIST_REMOVE(pp, provider); 220 gp = pp->geom; 221 g_free(pp); 222 if (!(gp->flags & G_GEOM_WITHER)) 223 return; 224 if (!LIST_EMPTY(&gp->provider)) 225 return; 226 for (;;) { 227 cp = LIST_FIRST(&gp->consumer); 228 if (cp == NULL) 229 break; 230 g_detach(cp); 231 g_destroy_consumer(cp); 232 } 233 g_destroy_geom(gp); 234} 235 236/* 237 * We keep the "geoms" list sorted by topological order (== increasing 238 * numerical rank) at all times. 239 * When an attach is done, the attaching geoms rank is invalidated 240 * and it is moved to the tail of the list. 241 * All geoms later in the sequence has their ranks reevaluated in 242 * sequence. If we cannot assign rank to a geom because it's 243 * prerequisites do not have rank, we move that element to the tail 244 * of the sequence with invalid rank as well. 245 * At some point we encounter our original geom and if we stil fail 246 * to assign it a rank, there must be a loop and we fail back to 247 * g_attach() which detach again and calls redo_rank again 248 * to fix up the damage. 249 * It would be much simpler code wise to do it recursively, but we 250 * can't risk that on the kernel stack. 251 */ 252 253static int 254redo_rank(struct g_geom *gp) 255{ 256 struct g_consumer *cp; 257 struct g_geom *gp1, *gp2; 258 int n, m; 259 260 g_topology_assert(); 261 262 /* Invalidate this geoms rank and move it to the tail */ 263 gp1 = TAILQ_NEXT(gp, geoms); 264 if (gp1 != NULL) { 265 gp->rank = 0; 266 TAILQ_REMOVE(&geoms, gp, geoms); 267 TAILQ_INSERT_TAIL(&geoms, gp, geoms); 268 } else { 269 gp1 = gp; 270 } 271 272 /* re-rank the rest of the sequence */ 273 for (; gp1 != NULL; gp1 = gp2) { 274 gp1->rank = 0; 275 m = 1; 276 LIST_FOREACH(cp, &gp1->consumer, consumer) { 277 if (cp->provider == NULL) 278 continue; 279 n = cp->provider->geom->rank; 280 if (n == 0) { 281 m = 0; 282 break; 283 } else if (n >= m) 284 m = n + 1; 285 } 286 gp1->rank = m; 287 gp2 = TAILQ_NEXT(gp1, geoms); 288 289 /* got a rank, moving on */ 290 if (m != 0) 291 continue; 292 293 /* no rank to original geom means loop */ 294 if (gp == gp1) 295 return (ELOOP); 296 297 /* no rank, put it at the end move on */ 298 TAILQ_REMOVE(&geoms, gp1, geoms); 299 TAILQ_INSERT_TAIL(&geoms, gp1, geoms); 300 } 301 return (0); 302} 303 304int 305g_attach(struct g_consumer *cp, struct g_provider *pp) 306{ 307 int error; 308 309 g_topology_assert(); 310 KASSERT(cp->provider == NULL, ("attach but attached")); 311 cp->provider = pp; 312 LIST_INSERT_HEAD(&pp->consumers, cp, consumers); 313 error = redo_rank(cp->geom); 314 if (error) { 315 LIST_REMOVE(cp, consumers); 316 cp->provider = NULL; 317 redo_rank(cp->geom); 318 } 319 return (error); 320} 321 322void 323g_detach(struct g_consumer *cp) 324{ 325 struct g_provider *pp; 326 327 g_trace(G_T_TOPOLOGY, "g_detach(%p)", cp); 328 KASSERT(cp != (void*)0xd0d0d0d0, ("ARGH!")); 329 g_topology_assert(); 330 KASSERT(cp->provider != NULL, ("detach but not attached")); 331 KASSERT(cp->acr == 0, ("detach but nonzero acr")); 332 KASSERT(cp->acw == 0, ("detach but nonzero acw")); 333 KASSERT(cp->ace == 0, ("detach but nonzero ace")); 334 KASSERT(cp->biocount == 0, ("detach but nonzero biocount")); 335 pp = cp->provider; 336 LIST_REMOVE(cp, consumers); 337 cp->provider = NULL; 338 if (LIST_EMPTY(&pp->consumers)) { 339 if (pp->geom->flags & G_GEOM_WITHER) 340 g_destroy_provider(pp); 341 } 342 redo_rank(cp->geom); 343} 344 345 346/* 347 * g_access_abs() 348 * 349 * Access-check with absolute new values: Just fall through 350 * and use the relative version. 351 */ 352int 353g_access_abs(struct g_consumer *cp, int acr, int acw, int ace) 354{ 355 356 g_topology_assert(); 357 return(g_access_rel(cp, 358 acr - cp->acr, 359 acw - cp->acw, 360 ace - cp->ace)); 361} 362 363/* 364 * g_access_rel() 365 * 366 * Access-check with delta values. The question asked is "can provider 367 * "cp" change the access counters by the relative amounts dc[rwe] ?" 368 */ 369 370int 371g_access_rel(struct g_consumer *cp, int dcr, int dcw, int dce) 372{ 373 struct g_provider *pp; 374 int pr,pw,pe; 375 int error; 376 377 pp = cp->provider; 378 379 g_trace(G_T_ACCESS, "g_access_rel(%p(%s), %d, %d, %d)", 380 cp, pp->name, dcr, dcw, dce); 381 382 g_topology_assert(); 383 KASSERT(cp->provider != NULL, ("access but not attached")); 384 KASSERT(cp->acr + dcr >= 0, ("access resulting in negative acr")); 385 KASSERT(cp->acw + dcw >= 0, ("access resulting in negative acw")); 386 KASSERT(cp->ace + dce >= 0, ("access resulting in negative ace")); 387 KASSERT(pp->geom->access != NULL, ("NULL geom->access")); 388 389 /* 390 * If our class cares about being spoiled, and we have been, we 391 * are probably just ahead of the event telling us that. Fail 392 * now rather than having to unravel this later. 393 */ 394 if (cp->geom->spoiled != NULL && cp->spoiled) { 395 KASSERT(dcr >= 0, ("spoiled but dcr = %d", dcr)); 396 KASSERT(dcw >= 0, ("spoiled but dce = %d", dcw)); 397 KASSERT(dce >= 0, ("spoiled but dcw = %d", dce)); 398 KASSERT(cp->acr == 0, ("spoiled but cp->acr = %d", cp->acr)); 399 KASSERT(cp->acw == 0, ("spoiled but cp->acw = %d", cp->acw)); 400 KASSERT(cp->ace == 0, ("spoiled but cp->ace = %d", cp->ace)); 401 return(ENXIO); 402 } 403 404 /* 405 * Figure out what counts the provider would have had, if this 406 * consumer had (r0w0e0) at this time. 407 */ 408 pr = pp->acr - cp->acr; 409 pw = pp->acw - cp->acw; 410 pe = pp->ace - cp->ace; 411 412 g_trace(G_T_ACCESS, 413 "open delta:[r%dw%de%d] old:[r%dw%de%d] provider:[r%dw%de%d] %p(%s)", 414 dcr, dcw, dce, 415 cp->acr, cp->acw, cp->ace, 416 pp->acr, pp->acw, pp->ace, 417 pp, pp->name); 418 419 /* If we try exclusive but already write: fail */ 420 if (dce > 0 && pw > 0) 421 return (EPERM); 422 /* If we try write but already exclusive: fail */ 423 if (dcw > 0 && pe > 0) 424 return (EPERM); 425 /* If we try to open more but provider is error'ed: fail */ 426 if ((dcr > 0 || dcw > 0 || dce > 0) && pp->error != 0) 427 return (pp->error); 428 429 /* Ok then... */ 430 431 /* 432 * If we open first write, spoil any partner consumers. 433 * If we close last write, trigger re-taste. 434 */ 435 if (pp->acw == 0 && dcw != 0) 436 g_spoil(pp, cp); 437 else if (pp->acw != 0 && pp->acw == -dcw && !(pp->geom->flags & G_GEOM_WITHER)) 438 g_post_event(EV_NEW_PROVIDER, NULL, NULL, pp, NULL); 439 440 error = pp->geom->access(pp, dcr, dcw, dce); 441 if (!error) { 442 pp->acr += dcr; 443 pp->acw += dcw; 444 pp->ace += dce; 445 cp->acr += dcr; 446 cp->acw += dcw; 447 cp->ace += dce; 448 } 449 return (error); 450} 451 452int 453g_handleattr_int(struct bio *bp, char *attribute, int val) 454{ 455 456 return (g_handleattr(bp, attribute, &val, sizeof val)); 457} 458 459int 460g_handleattr_off_t(struct bio *bp, char *attribute, off_t val) 461{ 462 463 return (g_handleattr(bp, attribute, &val, sizeof val)); 464} 465 466 467int 468g_handleattr(struct bio *bp, char *attribute, void *val, int len) 469{ 470 int error; 471 472 if (strcmp(bp->bio_attribute, attribute)) 473 return (0); 474 if (bp->bio_length != len) { 475 printf("bio_length %jd len %d -> EFAULT\n", 476 (intmax_t)bp->bio_length, len); 477 error = EFAULT; 478 } else { 479 error = 0; 480 bcopy(val, bp->bio_data, len); 481 bp->bio_completed = len; 482 } 483 g_io_deliver(bp, error); 484 return (1); 485} 486 487int 488g_std_access(struct g_provider *pp __unused, 489 int dr __unused, int dw __unused, int de __unused) 490{ 491 492 return (0); 493} 494 495void 496g_std_done(struct bio *bp) 497{ 498 struct bio *bp2; 499 500 bp2 = bp->bio_linkage; 501 if (bp2->bio_error == 0) 502 bp2->bio_error = bp->bio_error; 503 bp2->bio_completed += bp->bio_completed; 504 g_destroy_bio(bp); 505 bp2->bio_children--; /* XXX: atomic ? */ 506 if (bp2->bio_children == 0) 507 g_io_deliver(bp2, bp2->bio_error); 508} 509 510/* XXX: maybe this is only g_slice_spoiled */ 511 512void 513g_std_spoiled(struct g_consumer *cp) 514{ 515 struct g_geom *gp; 516 struct g_provider *pp; 517 518 g_trace(G_T_TOPOLOGY, "g_std_spoiled(%p)", cp); 519 g_topology_assert(); 520 g_detach(cp); 521 gp = cp->geom; 522 LIST_FOREACH(pp, &gp->provider, provider) 523 g_orphan_provider(pp, ENXIO); 524 g_destroy_consumer(cp); 525 if (LIST_EMPTY(&gp->provider) && LIST_EMPTY(&gp->consumer)) 526 g_destroy_geom(gp); 527 else 528 gp->flags |= G_GEOM_WITHER; 529} 530 531/* 532 * Spoiling happens when a provider is opened for writing, but consumers 533 * which are configured by in-band data are attached (slicers for instance). 534 * Since the write might potentially change the in-band data, such consumers 535 * need to re-evaluate their existence after the writing session closes. 536 * We do this by (offering to) tear them down when the open for write happens 537 * in return for a re-taste when it closes again. 538 * Together with the fact that such consumers grab an 'e' bit whenever they 539 * are open, regardless of mode, this ends up DTRT. 540 */ 541 542void 543g_spoil(struct g_provider *pp, struct g_consumer *cp) 544{ 545 struct g_consumer *cp2; 546 547 g_topology_assert(); 548 549 LIST_FOREACH(cp2, &pp->consumers, consumers) { 550 if (cp2 == cp) 551 continue; 552/* 553 KASSERT(cp2->acr == 0, ("spoiling cp->acr = %d", cp2->acr)); 554 KASSERT(cp2->acw == 0, ("spoiling cp->acw = %d", cp2->acw)); 555*/ 556 KASSERT(cp2->ace == 0, ("spoiling cp->ace = %d", cp2->ace)); 557 cp2->spoiled++; 558 } 559 g_post_event(EV_SPOILED, NULL, NULL, pp, cp); 560} 561 562static struct g_class * 563g_class_by_name(char *name) 564{ 565 struct g_class *mp; 566 567 g_trace(G_T_TOPOLOGY, "g_class_by_name(%s)", name); 568 g_topology_assert(); 569 LIST_FOREACH(mp, &g_classes, class) 570 if (!strcmp(mp->name, name)) 571 return (mp); 572 return (NULL); 573} 574 575struct g_geom * 576g_insert_geom(char *class, struct g_consumer *cp) 577{ 578 struct g_class *mp; 579 struct g_geom *gp; 580 struct g_provider *pp, *pp2; 581 struct g_consumer *cp2; 582 int error; 583 584 g_trace(G_T_TOPOLOGY, "g_insert_geomf(%s, %p)", class, cp); 585 g_topology_assert(); 586 KASSERT(cp->provider != NULL, ("g_insert_geomf but not attached")); 587 /* XXX: check for events ?? */ 588 mp = g_class_by_name(class); 589 if (mp == NULL) 590 return (NULL); 591 if (mp->create_geom == NULL) 592 return (NULL); 593 pp = cp->provider; 594 gp = mp->taste(mp, pp, G_TF_TRANSPARENT); 595 if (gp == NULL) 596 return (NULL); 597 pp2 = LIST_FIRST(&gp->provider); 598 cp2 = LIST_FIRST(&gp->consumer); 599 cp2->acr += pp->acr; 600 cp2->acw += pp->acw; 601 cp2->ace += pp->ace; 602 pp2->acr += pp->acr; 603 pp2->acw += pp->acw; 604 pp2->ace += pp->ace; 605 LIST_REMOVE(cp, consumers); 606 LIST_INSERT_HEAD(&pp2->consumers, cp, consumers); 607 cp->provider = pp2; 608 error = redo_rank(gp); 609 KASSERT(error == 0, ("redo_rank failed in g_insert_geom")); 610 return (gp); 611} 612 613int 614g_getattr__(const char *attr, struct g_consumer *cp, void *var, int len) 615{ 616 int error, i; 617 618 i = len; 619 error = g_io_getattr(attr, cp, &i, var); 620 if (error) 621 return (error); 622 if (i != len) 623 return (EINVAL); 624 return (0); 625} 626 627/* 628 * Check if the given pointer is a live object 629 */ 630 631void 632g_sanity(void *ptr) 633{ 634 struct g_class *mp; 635 struct g_geom *gp; 636 struct g_consumer *cp; 637 struct g_provider *pp; 638 639 if (!(g_debugflags & 0x8)) 640 return; 641 LIST_FOREACH(mp, &g_classes, class) { 642 KASSERT(mp != ptr, ("Ptr is live class")); 643 KASSERT(mp->protect == 0x20016600, 644 ("corrupt class %p %x", mp, mp->protect)); 645 LIST_FOREACH(gp, &mp->geom, geom) { 646 KASSERT(gp != ptr, ("Ptr is live geom")); 647 KASSERT(gp->protect == 0x20016601, 648 ("corrupt geom, %p %x", gp, gp->protect)); 649 KASSERT(gp->name != ptr, ("Ptr is live geom's name")); 650 LIST_FOREACH(cp, &gp->consumer, consumer) { 651 KASSERT(cp != ptr, ("Ptr is live consumer")); 652 KASSERT(cp->protect == 0x20016602, 653 ("corrupt consumer %p %x", 654 cp, cp->protect)); 655 } 656 LIST_FOREACH(pp, &gp->provider, provider) { 657 KASSERT(pp != ptr, ("Ptr is live provider")); 658 KASSERT(pp->protect == 0x20016603, 659 ("corrupt provider %p %x", 660 pp, pp->protect)); 661 } 662 } 663 } 664} 665 666#ifdef _KERNEL 667struct g_class * 668g_idclass(struct geomidorname *p) 669{ 670 struct g_class *mp; 671 char *n; 672 673 if (p->len == 0) { 674 LIST_FOREACH(mp, &g_classes, class) 675 if ((uintptr_t)mp == p->u.id) 676 return (mp); 677 return (NULL); 678 } 679 n = g_malloc(p->len + 1, M_WAITOK); 680 if (copyin(p->u.name, n, p->len) == 0) { 681 n[p->len] = '\0'; 682 LIST_FOREACH(mp, &g_classes, class) 683 if (!bcmp(n, mp->name, p->len + 1)) { 684 g_free(n); 685 return (mp); 686 } 687 } 688 g_free(n); 689 return (NULL); 690} 691 692struct g_geom * 693g_idgeom(struct geomidorname *p) 694{ 695 struct g_class *mp; 696 struct g_geom *gp; 697 char *n; 698 699 if (p->len == 0) { 700 LIST_FOREACH(mp, &g_classes, class) 701 LIST_FOREACH(gp, &mp->geom, geom) 702 if ((uintptr_t)gp == p->u.id) 703 return (gp); 704 return (NULL); 705 } 706 n = g_malloc(p->len + 1, M_WAITOK); 707 if (copyin(p->u.name, n, p->len) == 0) { 708 n[p->len] = '\0'; 709 LIST_FOREACH(mp, &g_classes, class) 710 LIST_FOREACH(gp, &mp->geom, geom) 711 if (!bcmp(n, gp->name, p->len + 1)) { 712 g_free(n); 713 return (gp); 714 } 715 } 716 g_free(n); 717 return (NULL); 718} 719 720struct g_provider * 721g_idprovider(struct geomidorname *p) 722{ 723 struct g_class *mp; 724 struct g_geom *gp; 725 struct g_provider *pp; 726 char *n; 727 728 if (p->len == 0) { 729 LIST_FOREACH(mp, &g_classes, class) 730 LIST_FOREACH(gp, &mp->geom, geom) 731 LIST_FOREACH(pp, &gp->provider, provider) 732 if ((uintptr_t)pp == p->u.id) 733 return (pp); 734 return (NULL); 735 } 736 n = g_malloc(p->len + 1, M_WAITOK); 737 if (copyin(p->u.name, n, p->len) == 0) { 738 n[p->len] = '\0'; 739 LIST_FOREACH(mp, &g_classes, class) 740 LIST_FOREACH(gp, &mp->geom, geom) 741 LIST_FOREACH(pp, &gp->provider, provider) 742 if (!bcmp(n, pp->name, p->len + 1)) { 743 g_free(n); 744 return (pp); 745 } 746 } 747 g_free(n); 748 return (NULL); 749} 750#endif /* _KERNEL */ 751