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 * 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 <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/malloc.h> 42 #include <sys/kernel.h> 43 #include <sys/conf.h> 44 #include <sys/ctype.h> 45 #include <sys/bio.h> 46 #include <sys/bus.h> 47 #include <sys/lock.h> 48 #include <sys/mutex.h> 49 #include <sys/proc.h> 50 #include <sys/errno.h> 51 #include <sys/time.h> 52 #include <sys/disk.h> 53 #include <sys/fcntl.h> 54 #include <sys/limits.h> 55 #include <sys/sysctl.h> 56 #include <geom/geom.h> 57 #include <geom/geom_int.h> 58 #include <machine/stdarg.h> 59 60 struct g_dev_softc { 61 struct mtx sc_mtx; 62 struct cdev *sc_dev; 63 struct cdev *sc_alias; 64 int sc_open; 65 u_int sc_active; 66 #define SC_A_DESTROY (1 << 31) 67 #define SC_A_OPEN (1 << 30) 68 #define SC_A_ACTIVE (SC_A_OPEN - 1) 69 }; 70 71 static d_open_t g_dev_open; 72 static d_close_t g_dev_close; 73 static d_strategy_t g_dev_strategy; 74 static d_ioctl_t g_dev_ioctl; 75 76 static struct cdevsw g_dev_cdevsw = { 77 .d_version = D_VERSION, 78 .d_open = g_dev_open, 79 .d_close = g_dev_close, 80 .d_read = physread, 81 .d_write = physwrite, 82 .d_ioctl = g_dev_ioctl, 83 .d_strategy = g_dev_strategy, 84 .d_name = "g_dev", 85 .d_flags = D_DISK | D_TRACKCLOSE, 86 }; 87 88 static g_init_t g_dev_init; 89 static g_fini_t g_dev_fini; 90 static g_taste_t g_dev_taste; 91 static g_orphan_t g_dev_orphan; 92 static g_attrchanged_t g_dev_attrchanged; 93 94 static struct g_class g_dev_class = { 95 .name = "DEV", 96 .version = G_VERSION, 97 .init = g_dev_init, 98 .fini = g_dev_fini, 99 .taste = g_dev_taste, 100 .orphan = g_dev_orphan, 101 .attrchanged = g_dev_attrchanged 102 }; 103 104 /* 105 * We target 262144 (8 x 32768) sectors by default as this significantly 106 * increases the throughput on commonly used SSD's with a marginal 107 * increase in non-interruptible request latency. 108 */ 109 static uint64_t g_dev_del_max_sectors = 262144; 110 SYSCTL_DECL(_kern_geom); 111 SYSCTL_NODE(_kern_geom, OID_AUTO, dev, CTLFLAG_RW, 0, "GEOM_DEV stuff"); 112 SYSCTL_QUAD(_kern_geom_dev, OID_AUTO, delete_max_sectors, CTLFLAG_RW, 113 &g_dev_del_max_sectors, 0, "Maximum number of sectors in a single " 114 "delete request sent to the provider. Larger requests are chunked " 115 "so they can be interrupted. (0 = disable chunking)"); 116 117 static char *dumpdev = NULL; 118 static void 119 g_dev_init(struct g_class *mp) 120 { 121 122 dumpdev = kern_getenv("dumpdev"); 123 } 124 125 static void 126 g_dev_fini(struct g_class *mp) 127 { 128 129 freeenv(dumpdev); 130 dumpdev = NULL; 131 } 132 133 static int 134 g_dev_setdumpdev(struct cdev *dev, struct thread *td) 135 { 136 struct g_kerneldump kd; 137 struct g_consumer *cp; 138 int error, len; 139 140 if (dev == NULL) 141 return (set_dumper(NULL, NULL, td)); 142 143 cp = dev->si_drv2; 144 len = sizeof(kd); 145 kd.offset = 0; 146 kd.length = OFF_MAX; 147 error = g_io_getattr("GEOM::kerneldump", cp, &len, &kd); 148 if (error == 0) { 149 error = set_dumper(&kd.di, devtoname(dev), td); 150 if (error == 0) 151 dev->si_flags |= SI_DUMPDEV; 152 } 153 return (error); 154 } 155 156 static int 157 init_dumpdev(struct cdev *dev) 158 { 159 struct g_consumer *cp; 160 const char *devprefix = "/dev/", *devname; 161 int error; 162 size_t len; 163 164 if (dumpdev == NULL) 165 return (0); 166 167 len = strlen(devprefix); 168 devname = devtoname(dev); 169 if (strcmp(devname, dumpdev) != 0 && 170 (strncmp(dumpdev, devprefix, len) != 0 || 171 strcmp(devname, dumpdev + len) != 0)) 172 return (0); 173 174 cp = (struct g_consumer *)dev->si_drv2; 175 error = g_access(cp, 1, 0, 0); 176 if (error != 0) 177 return (error); 178 179 error = g_dev_setdumpdev(dev, curthread); 180 if (error == 0) { 181 freeenv(dumpdev); 182 dumpdev = NULL; 183 } 184 185 (void)g_access(cp, -1, 0, 0); 186 187 return (error); 188 } 189 190 static void 191 g_dev_destroy(void *arg, int flags __unused) 192 { 193 struct g_consumer *cp; 194 struct g_geom *gp; 195 struct g_dev_softc *sc; 196 char buf[SPECNAMELEN + 6]; 197 198 g_topology_assert(); 199 cp = arg; 200 gp = cp->geom; 201 sc = cp->private; 202 g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name); 203 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 204 devctl_notify_f("GEOM", "DEV", "DESTROY", buf, M_WAITOK); 205 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 206 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 207 g_detach(cp); 208 g_destroy_consumer(cp); 209 g_destroy_geom(gp); 210 mtx_destroy(&sc->sc_mtx); 211 g_free(sc); 212 } 213 214 void 215 g_dev_print(void) 216 { 217 struct g_geom *gp; 218 char const *p = ""; 219 220 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 221 printf("%s%s", p, gp->name); 222 p = " "; 223 } 224 printf("\n"); 225 } 226 227 static void 228 g_dev_set_physpath(struct g_consumer *cp) 229 { 230 struct g_dev_softc *sc; 231 char *physpath; 232 int error, physpath_len; 233 234 if (g_access(cp, 1, 0, 0) != 0) 235 return; 236 237 sc = cp->private; 238 physpath_len = MAXPATHLEN; 239 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO); 240 error = g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath); 241 g_access(cp, -1, 0, 0); 242 if (error == 0 && strlen(physpath) != 0) { 243 struct cdev *dev, *old_alias_dev; 244 struct cdev **alias_devp; 245 246 dev = sc->sc_dev; 247 old_alias_dev = sc->sc_alias; 248 alias_devp = (struct cdev **)&sc->sc_alias; 249 make_dev_physpath_alias(MAKEDEV_WAITOK, alias_devp, dev, 250 old_alias_dev, physpath); 251 } else if (sc->sc_alias) { 252 destroy_dev((struct cdev *)sc->sc_alias); 253 sc->sc_alias = NULL; 254 } 255 g_free(physpath); 256 } 257 258 static void 259 g_dev_set_media(struct g_consumer *cp) 260 { 261 struct g_dev_softc *sc; 262 struct cdev *dev; 263 char buf[SPECNAMELEN + 6]; 264 265 sc = cp->private; 266 dev = sc->sc_dev; 267 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 268 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 269 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK); 270 dev = sc->sc_alias; 271 if (dev != NULL) { 272 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 273 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 274 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK); 275 } 276 } 277 278 static void 279 g_dev_attrchanged(struct g_consumer *cp, const char *attr) 280 { 281 282 if (strcmp(attr, "GEOM::media") == 0) { 283 g_dev_set_media(cp); 284 return; 285 } 286 287 if (strcmp(attr, "GEOM::physpath") == 0) { 288 g_dev_set_physpath(cp); 289 return; 290 } 291 } 292 293 struct g_provider * 294 g_dev_getprovider(struct cdev *dev) 295 { 296 struct g_consumer *cp; 297 298 g_topology_assert(); 299 if (dev == NULL) 300 return (NULL); 301 if (dev->si_devsw != &g_dev_cdevsw) 302 return (NULL); 303 cp = dev->si_drv2; 304 return (cp->provider); 305 } 306 307 static struct g_geom * 308 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 309 { 310 struct g_geom *gp; 311 struct g_consumer *cp; 312 struct g_dev_softc *sc; 313 int error; 314 struct cdev *dev; 315 char buf[SPECNAMELEN + 6]; 316 317 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 318 g_topology_assert(); 319 gp = g_new_geomf(mp, "%s", pp->name); 320 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 321 mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF); 322 cp = g_new_consumer(gp); 323 cp->private = sc; 324 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 325 error = g_attach(cp, pp); 326 KASSERT(error == 0, 327 ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 328 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &dev, 329 &g_dev_cdevsw, NULL, UID_ROOT, GID_OPERATOR, 0640, "%s", gp->name); 330 if (error != 0) { 331 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n", 332 __func__, gp->name, error); 333 g_detach(cp); 334 g_destroy_consumer(cp); 335 g_destroy_geom(gp); 336 mtx_destroy(&sc->sc_mtx); 337 g_free(sc); 338 return (NULL); 339 } 340 dev->si_flags |= SI_UNMAPPED; 341 sc->sc_dev = dev; 342 343 dev->si_iosize_max = MAXPHYS; 344 dev->si_drv2 = cp; 345 error = init_dumpdev(dev); 346 if (error != 0) 347 printf("%s: init_dumpdev() failed (gp->name=%s, error=%d)\n", 348 __func__, gp->name, error); 349 350 g_dev_attrchanged(cp, "GEOM::physpath"); 351 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 352 devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK); 353 354 return (gp); 355 } 356 357 static int 358 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 359 { 360 struct g_consumer *cp; 361 struct g_dev_softc *sc; 362 int error, r, w, e; 363 364 cp = dev->si_drv2; 365 if (cp == NULL) 366 return (ENXIO); /* g_dev_taste() not done yet */ 367 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 368 cp->geom->name, flags, fmt, td); 369 370 r = flags & FREAD ? 1 : 0; 371 w = flags & FWRITE ? 1 : 0; 372 #ifdef notyet 373 e = flags & O_EXCL ? 1 : 0; 374 #else 375 e = 0; 376 #endif 377 378 /* 379 * This happens on attempt to open a device node with O_EXEC. 380 */ 381 if (r + w + e == 0) 382 return (EINVAL); 383 384 if (w) { 385 /* 386 * When running in very secure mode, do not allow 387 * opens for writing of any disks. 388 */ 389 error = securelevel_ge(td->td_ucred, 2); 390 if (error) 391 return (error); 392 } 393 g_topology_lock(); 394 error = g_access(cp, r, w, e); 395 g_topology_unlock(); 396 if (error == 0) { 397 sc = cp->private; 398 mtx_lock(&sc->sc_mtx); 399 if (sc->sc_open == 0 && (sc->sc_active & SC_A_ACTIVE) != 0) 400 wakeup(&sc->sc_active); 401 sc->sc_open += r + w + e; 402 if (sc->sc_open == 0) 403 atomic_clear_int(&sc->sc_active, SC_A_OPEN); 404 else 405 atomic_set_int(&sc->sc_active, SC_A_OPEN); 406 mtx_unlock(&sc->sc_mtx); 407 } 408 return (error); 409 } 410 411 static int 412 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 413 { 414 struct g_consumer *cp; 415 struct g_dev_softc *sc; 416 int error, r, w, e; 417 418 cp = dev->si_drv2; 419 if (cp == NULL) 420 return (ENXIO); 421 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 422 cp->geom->name, flags, fmt, td); 423 424 r = flags & FREAD ? -1 : 0; 425 w = flags & FWRITE ? -1 : 0; 426 #ifdef notyet 427 e = flags & O_EXCL ? -1 : 0; 428 #else 429 e = 0; 430 #endif 431 432 /* 433 * The vgonel(9) - caused by eg. forced unmount of devfs - calls 434 * VOP_CLOSE(9) on devfs vnode without any FREAD or FWRITE flags, 435 * which would result in zero deltas, which in turn would cause 436 * panic in g_access(9). 437 * 438 * Note that we cannot zero the counters (ie. do "r = cp->acr" 439 * etc) instead, because the consumer might be opened in another 440 * devfs instance. 441 */ 442 if (r + w + e == 0) 443 return (EINVAL); 444 445 sc = cp->private; 446 mtx_lock(&sc->sc_mtx); 447 sc->sc_open += r + w + e; 448 if (sc->sc_open == 0) 449 atomic_clear_int(&sc->sc_active, SC_A_OPEN); 450 else 451 atomic_set_int(&sc->sc_active, SC_A_OPEN); 452 while (sc->sc_open == 0 && (sc->sc_active & SC_A_ACTIVE) != 0) 453 msleep(&sc->sc_active, &sc->sc_mtx, 0, "g_dev_close", hz / 10); 454 mtx_unlock(&sc->sc_mtx); 455 g_topology_lock(); 456 error = g_access(cp, r, w, e); 457 g_topology_unlock(); 458 return (error); 459 } 460 461 /* 462 * XXX: Until we have unmessed the ioctl situation, there is a race against 463 * XXX: a concurrent orphanization. We cannot close it by holding topology 464 * XXX: since that would prevent us from doing our job, and stalling events 465 * XXX: will break (actually: stall) the BSD disklabel hacks. 466 */ 467 static int 468 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 469 { 470 struct g_consumer *cp; 471 struct g_provider *pp; 472 off_t offset, length, chunk, odd; 473 int i, error; 474 475 cp = dev->si_drv2; 476 pp = cp->provider; 477 478 error = 0; 479 KASSERT(cp->acr || cp->acw, 480 ("Consumer with zero access count in g_dev_ioctl")); 481 482 i = IOCPARM_LEN(cmd); 483 switch (cmd) { 484 case DIOCGSECTORSIZE: 485 *(u_int *)data = cp->provider->sectorsize; 486 if (*(u_int *)data == 0) 487 error = ENOENT; 488 break; 489 case DIOCGMEDIASIZE: 490 *(off_t *)data = cp->provider->mediasize; 491 if (*(off_t *)data == 0) 492 error = ENOENT; 493 break; 494 case DIOCGFWSECTORS: 495 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 496 if (error == 0 && *(u_int *)data == 0) 497 error = ENOENT; 498 break; 499 case DIOCGFWHEADS: 500 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 501 if (error == 0 && *(u_int *)data == 0) 502 error = ENOENT; 503 break; 504 case DIOCGFRONTSTUFF: 505 error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 506 break; 507 case DIOCSKERNELDUMP: 508 if (*(u_int *)data == 0) 509 error = g_dev_setdumpdev(NULL, td); 510 else 511 error = g_dev_setdumpdev(dev, td); 512 break; 513 case DIOCGFLUSH: 514 error = g_io_flush(cp); 515 break; 516 case DIOCGDELETE: 517 offset = ((off_t *)data)[0]; 518 length = ((off_t *)data)[1]; 519 if ((offset % cp->provider->sectorsize) != 0 || 520 (length % cp->provider->sectorsize) != 0 || length <= 0) { 521 printf("%s: offset=%jd length=%jd\n", __func__, offset, 522 length); 523 error = EINVAL; 524 break; 525 } 526 while (length > 0) { 527 chunk = length; 528 if (g_dev_del_max_sectors != 0 && chunk > 529 g_dev_del_max_sectors * cp->provider->sectorsize) { 530 chunk = g_dev_del_max_sectors * 531 cp->provider->sectorsize; 532 if (cp->provider->stripesize > 0) { 533 odd = (offset + chunk + 534 cp->provider->stripeoffset) % 535 cp->provider->stripesize; 536 if (chunk > odd) 537 chunk -= odd; 538 } 539 } 540 error = g_delete_data(cp, offset, chunk); 541 length -= chunk; 542 offset += chunk; 543 if (error) 544 break; 545 /* 546 * Since the request size can be large, the service 547 * time can be is likewise. We make this ioctl 548 * interruptible by checking for signals for each bio. 549 */ 550 if (SIGPENDING(td)) 551 break; 552 } 553 break; 554 case DIOCGIDENT: 555 error = g_io_getattr("GEOM::ident", cp, &i, data); 556 break; 557 case DIOCGPROVIDERNAME: 558 if (pp == NULL) 559 return (ENOENT); 560 strlcpy(data, pp->name, i); 561 break; 562 case DIOCGSTRIPESIZE: 563 *(off_t *)data = cp->provider->stripesize; 564 break; 565 case DIOCGSTRIPEOFFSET: 566 *(off_t *)data = cp->provider->stripeoffset; 567 break; 568 case DIOCGPHYSPATH: 569 error = g_io_getattr("GEOM::physpath", cp, &i, data); 570 if (error == 0 && *(char *)data == '\0') 571 error = ENOENT; 572 break; 573 case DIOCGATTR: { 574 struct diocgattr_arg *arg = (struct diocgattr_arg *)data; 575 576 if (arg->len > sizeof(arg->value)) { 577 error = EINVAL; 578 break; 579 } 580 error = g_io_getattr(arg->name, cp, &arg->len, &arg->value); 581 break; 582 } 583 case DIOCZONECMD: { 584 struct disk_zone_args *zone_args =(struct disk_zone_args *)data; 585 struct disk_zone_rep_entry *new_entries, *old_entries; 586 struct disk_zone_report *rep; 587 size_t alloc_size; 588 589 old_entries = NULL; 590 new_entries = NULL; 591 rep = NULL; 592 alloc_size = 0; 593 594 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES) { 595 rep = &zone_args->zone_params.report; 596 #define MAXENTRIES (MAXPHYS / sizeof(struct disk_zone_rep_entry)) 597 if (rep->entries_allocated > MAXENTRIES) 598 rep->entries_allocated = MAXENTRIES; 599 alloc_size = rep->entries_allocated * 600 sizeof(struct disk_zone_rep_entry); 601 if (alloc_size != 0) 602 new_entries = g_malloc(alloc_size, 603 M_WAITOK| M_ZERO); 604 old_entries = rep->entries; 605 rep->entries = new_entries; 606 } 607 error = g_io_zonecmd(zone_args, cp); 608 if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES && 609 alloc_size != 0 && error == 0) 610 error = copyout(new_entries, old_entries, alloc_size); 611 if (old_entries != NULL && rep != NULL) 612 rep->entries = old_entries; 613 if (new_entries != NULL) 614 g_free(new_entries); 615 break; 616 } 617 default: 618 if (cp->provider->geom->ioctl != NULL) { 619 error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td); 620 } else { 621 error = ENOIOCTL; 622 } 623 } 624 625 return (error); 626 } 627 628 static void 629 g_dev_done(struct bio *bp2) 630 { 631 struct g_consumer *cp; 632 struct g_dev_softc *sc; 633 struct bio *bp; 634 int active; 635 636 cp = bp2->bio_from; 637 sc = cp->private; 638 bp = bp2->bio_parent; 639 bp->bio_error = bp2->bio_error; 640 bp->bio_completed = bp2->bio_completed; 641 bp->bio_resid = bp->bio_length - bp2->bio_completed; 642 if (bp2->bio_cmd == BIO_ZONE) 643 bcopy(&bp2->bio_zone, &bp->bio_zone, sizeof(bp->bio_zone)); 644 645 if (bp2->bio_error != 0) { 646 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 647 bp2, bp2->bio_error); 648 bp->bio_flags |= BIO_ERROR; 649 } else { 650 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 651 bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed); 652 } 653 g_destroy_bio(bp2); 654 active = atomic_fetchadd_int(&sc->sc_active, -1) - 1; 655 if ((active & SC_A_ACTIVE) == 0) { 656 if ((active & SC_A_OPEN) == 0) 657 wakeup(&sc->sc_active); 658 if (active & SC_A_DESTROY) 659 g_post_event(g_dev_destroy, cp, M_NOWAIT, NULL); 660 } 661 biodone(bp); 662 } 663 664 static void 665 g_dev_strategy(struct bio *bp) 666 { 667 struct g_consumer *cp; 668 struct bio *bp2; 669 struct cdev *dev; 670 struct g_dev_softc *sc; 671 672 KASSERT(bp->bio_cmd == BIO_READ || 673 bp->bio_cmd == BIO_WRITE || 674 bp->bio_cmd == BIO_DELETE || 675 bp->bio_cmd == BIO_FLUSH || 676 bp->bio_cmd == BIO_ZONE, 677 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 678 dev = bp->bio_dev; 679 cp = dev->si_drv2; 680 sc = cp->private; 681 KASSERT(cp->acr || cp->acw, 682 ("Consumer with zero access count in g_dev_strategy")); 683 #ifdef INVARIANTS 684 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 685 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 686 bp->bio_resid = bp->bio_bcount; 687 biofinish(bp, NULL, EINVAL); 688 return; 689 } 690 #endif 691 KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy")); 692 atomic_add_int(&sc->sc_active, 1); 693 694 for (;;) { 695 /* 696 * XXX: This is not an ideal solution, but I believe it to 697 * XXX: deadlock safely, all things considered. 698 */ 699 bp2 = g_clone_bio(bp); 700 if (bp2 != NULL) 701 break; 702 pause("gdstrat", hz / 10); 703 } 704 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 705 bp2->bio_done = g_dev_done; 706 g_trace(G_T_BIO, 707 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 708 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 709 bp2->bio_data, bp2->bio_cmd); 710 g_io_request(bp2, cp); 711 KASSERT(cp->acr || cp->acw, 712 ("g_dev_strategy raced with g_dev_close and lost")); 713 714 } 715 716 /* 717 * g_dev_callback() 718 * 719 * Called by devfs when asynchronous device destruction is completed. 720 * - Mark that we have no attached device any more. 721 * - If there are no outstanding requests, schedule geom destruction. 722 * Otherwise destruction will be scheduled later by g_dev_done(). 723 */ 724 725 static void 726 g_dev_callback(void *arg) 727 { 728 struct g_consumer *cp; 729 struct g_dev_softc *sc; 730 int active; 731 732 cp = arg; 733 sc = cp->private; 734 g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name); 735 736 sc->sc_dev = NULL; 737 sc->sc_alias = NULL; 738 active = atomic_fetchadd_int(&sc->sc_active, SC_A_DESTROY); 739 if ((active & SC_A_ACTIVE) == 0) 740 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 741 } 742 743 /* 744 * g_dev_orphan() 745 * 746 * Called from below when the provider orphaned us. 747 * - Clear any dump settings. 748 * - Request asynchronous device destruction to prevent any more requests 749 * from coming in. The provider is already marked with an error, so 750 * anything which comes in the interim will be returned immediately. 751 */ 752 753 static void 754 g_dev_orphan(struct g_consumer *cp) 755 { 756 struct cdev *dev; 757 struct g_dev_softc *sc; 758 759 g_topology_assert(); 760 sc = cp->private; 761 dev = sc->sc_dev; 762 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name); 763 764 /* Reset any dump-area set on this device */ 765 if (dev->si_flags & SI_DUMPDEV) 766 (void)set_dumper(NULL, NULL, curthread); 767 768 /* Destroy the struct cdev *so we get no more requests */ 769 delist_dev(dev); 770 destroy_dev_sched_cb(dev, g_dev_callback, cp); 771 } 772 773 DECLARE_GEOM_CLASS(g_dev_class, g_dev);
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