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 int sc_active; 66 }; 67 68 static d_open_t g_dev_open; 69 static d_close_t g_dev_close; 70 static d_strategy_t g_dev_strategy; 71 static d_ioctl_t g_dev_ioctl; 72 73 static struct cdevsw g_dev_cdevsw = { 74 .d_version = D_VERSION, 75 .d_open = g_dev_open, 76 .d_close = g_dev_close, 77 .d_read = physread, 78 .d_write = physwrite, 79 .d_ioctl = g_dev_ioctl, 80 .d_strategy = g_dev_strategy, 81 .d_name = "g_dev", 82 .d_flags = D_DISK | D_TRACKCLOSE, 83 }; 84 85 static g_init_t g_dev_init; 86 static g_fini_t g_dev_fini; 87 static g_taste_t g_dev_taste; 88 static g_orphan_t g_dev_orphan; 89 static g_attrchanged_t g_dev_attrchanged; 90 91 static struct g_class g_dev_class = { 92 .name = "DEV", 93 .version = G_VERSION, 94 .init = g_dev_init, 95 .fini = g_dev_fini, 96 .taste = g_dev_taste, 97 .orphan = g_dev_orphan, 98 .attrchanged = g_dev_attrchanged 99 }; 100 101 /* 102 * We target 262144 (8 x 32768) sectors by default as this significantly 103 * increases the throughput on commonly used SSD's with a marginal 104 * increase in non-interruptible request latency. 105 */ 106 static uint64_t g_dev_del_max_sectors = 262144; 107 SYSCTL_DECL(_kern_geom); 108 SYSCTL_NODE(_kern_geom, OID_AUTO, dev, CTLFLAG_RW, 0, "GEOM_DEV stuff"); 109 SYSCTL_QUAD(_kern_geom_dev, OID_AUTO, delete_max_sectors, CTLFLAG_RW, 110 &g_dev_del_max_sectors, 0, "Maximum number of sectors in a single " 111 "delete request sent to the provider. Larger requests are chunked " 112 "so they can be interrupted. (0 = disable chunking)"); 113 114 static char *dumpdev = NULL; 115 static void 116 g_dev_init(struct g_class *mp) 117 { 118 119 dumpdev = getenv("dumpdev"); 120 } 121 122 static void 123 g_dev_fini(struct g_class *mp) 124 { 125 126 freeenv(dumpdev); 127 dumpdev = NULL; 128 } 129 130 static int 131 g_dev_setdumpdev(struct cdev *dev, struct thread *td) 132 { 133 struct g_kerneldump kd; 134 struct g_consumer *cp; 135 int error, len; 136 137 if (dev == NULL) 138 return (set_dumper(NULL, NULL, td)); 139 140 cp = dev->si_drv2; 141 len = sizeof(kd); 142 kd.offset = 0; 143 kd.length = OFF_MAX; 144 error = g_io_getattr("GEOM::kerneldump", cp, &len, &kd); 145 if (error == 0) { 146 error = set_dumper(&kd.di, devtoname(dev), td); 147 if (error == 0) 148 dev->si_flags |= SI_DUMPDEV; 149 } 150 return (error); 151 } 152 153 static int 154 init_dumpdev(struct cdev *dev) 155 { 156 struct g_consumer *cp; 157 const char *devprefix = "/dev/", *devname; 158 int error; 159 size_t len; 160 161 if (dumpdev == NULL) 162 return (0); 163 164 len = strlen(devprefix); 165 devname = devtoname(dev); 166 if (strcmp(devname, dumpdev) != 0 && 167 (strncmp(dumpdev, devprefix, len) != 0 || 168 strcmp(devname, dumpdev + len) != 0)) 169 return (0); 170 171 cp = (struct g_consumer *)dev->si_drv2; 172 error = g_access(cp, 1, 0, 0); 173 if (error != 0) 174 return (error); 175 176 error = g_dev_setdumpdev(dev, curthread); 177 if (error == 0) { 178 freeenv(dumpdev); 179 dumpdev = NULL; 180 } 181 182 (void)g_access(cp, -1, 0, 0); 183 184 return (error); 185 } 186 187 static void 188 g_dev_destroy(void *arg, int flags __unused) 189 { 190 struct g_consumer *cp; 191 struct g_geom *gp; 192 struct g_dev_softc *sc; 193 char buf[SPECNAMELEN + 6]; 194 195 g_topology_assert(); 196 cp = arg; 197 gp = cp->geom; 198 sc = cp->private; 199 g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name); 200 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 201 devctl_notify_f("GEOM", "DEV", "DESTROY", buf, M_WAITOK); 202 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 203 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 204 g_detach(cp); 205 g_destroy_consumer(cp); 206 g_destroy_geom(gp); 207 mtx_destroy(&sc->sc_mtx); 208 g_free(sc); 209 } 210 211 void 212 g_dev_print(void) 213 { 214 struct g_geom *gp; 215 char const *p = ""; 216 217 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 218 printf("%s%s", p, gp->name); 219 p = " "; 220 } 221 printf("\n"); 222 } 223 224 static void 225 g_dev_set_physpath(struct g_consumer *cp) 226 { 227 struct g_dev_softc *sc; 228 char *physpath; 229 int error, physpath_len; 230 231 if (g_access(cp, 1, 0, 0) != 0) 232 return; 233 234 sc = cp->private; 235 physpath_len = MAXPATHLEN; 236 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO); 237 error = g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath); 238 g_access(cp, -1, 0, 0); 239 if (error == 0 && strlen(physpath) != 0) { 240 struct cdev *dev, *old_alias_dev; 241 struct cdev **alias_devp; 242 243 dev = sc->sc_dev; 244 old_alias_dev = sc->sc_alias; 245 alias_devp = (struct cdev **)&sc->sc_alias; 246 make_dev_physpath_alias(MAKEDEV_WAITOK, alias_devp, dev, 247 old_alias_dev, physpath); 248 } else if (sc->sc_alias) { 249 destroy_dev((struct cdev *)sc->sc_alias); 250 sc->sc_alias = NULL; 251 } 252 g_free(physpath); 253 } 254 255 static void 256 g_dev_set_media(struct g_consumer *cp) 257 { 258 struct g_dev_softc *sc; 259 struct cdev *dev; 260 char buf[SPECNAMELEN + 6]; 261 262 sc = cp->private; 263 dev = sc->sc_dev; 264 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 265 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 266 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK); 267 dev = sc->sc_alias; 268 if (dev != NULL) { 269 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 270 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 271 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK); 272 } 273 } 274 275 static void 276 g_dev_attrchanged(struct g_consumer *cp, const char *attr) 277 { 278 279 if (strcmp(attr, "GEOM::media") == 0) { 280 g_dev_set_media(cp); 281 return; 282 } 283 284 if (strcmp(attr, "GEOM::physpath") == 0) { 285 g_dev_set_physpath(cp); 286 return; 287 } 288 } 289 290 struct g_provider * 291 g_dev_getprovider(struct cdev *dev) 292 { 293 struct g_consumer *cp; 294 295 g_topology_assert(); 296 if (dev == NULL) 297 return (NULL); 298 if (dev->si_devsw != &g_dev_cdevsw) 299 return (NULL); 300 cp = dev->si_drv2; 301 return (cp->provider); 302 } 303 304 static struct g_geom * 305 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 306 { 307 struct g_geom *gp; 308 struct g_consumer *cp; 309 struct g_dev_softc *sc; 310 int error, len; 311 struct cdev *dev, *adev; 312 char buf[SPECNAMELEN + 6], *val; 313 314 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 315 g_topology_assert(); 316 gp = g_new_geomf(mp, "%s", pp->name); 317 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 318 mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF); 319 cp = g_new_consumer(gp); 320 cp->private = sc; 321 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 322 error = g_attach(cp, pp); 323 KASSERT(error == 0, 324 ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 325 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &dev, 326 &g_dev_cdevsw, NULL, UID_ROOT, GID_OPERATOR, 0640, "%s", gp->name); 327 if (error != 0) { 328 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n", 329 __func__, gp->name, error); 330 g_detach(cp); 331 g_destroy_consumer(cp); 332 g_destroy_geom(gp); 333 mtx_destroy(&sc->sc_mtx); 334 g_free(sc); 335 return (NULL); 336 } 337 dev->si_flags |= SI_UNMAPPED; 338 sc->sc_dev = dev; 339 340 /* Search for device alias name and create it if found. */ 341 adev = NULL; 342 for (len = MIN(strlen(gp->name), sizeof(buf) - 15); len > 0; len--) { 343 snprintf(buf, sizeof(buf), "kern.devalias.%s", gp->name); 344 buf[14 + len] = 0; 345 val = getenv(buf); 346 if (val != NULL) { 347 snprintf(buf, sizeof(buf), "%s%s", 348 val, gp->name + len); 349 freeenv(val); 350 make_dev_alias_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, 351 &adev, dev, "%s", buf); 352 adev->si_flags |= SI_UNMAPPED; 353 break; 354 } 355 } 356 357 dev->si_iosize_max = MAXPHYS; 358 dev->si_drv2 = cp; 359 error = init_dumpdev(dev); 360 if (error != 0) 361 printf("%s: init_dumpdev() failed (gp->name=%s, error=%d)\n", 362 __func__, gp->name, error); 363 if (adev != NULL) { 364 adev->si_iosize_max = MAXPHYS; 365 adev->si_drv2 = cp; 366 init_dumpdev(adev); 367 } 368 369 g_dev_attrchanged(cp, "GEOM::physpath"); 370 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 371 devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK); 372 373 return (gp); 374 } 375 376 static int 377 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 378 { 379 struct g_consumer *cp; 380 struct g_dev_softc *sc; 381 int error, r, w, e; 382 383 cp = dev->si_drv2; 384 if (cp == NULL) 385 return(ENXIO); /* g_dev_taste() not done yet */ 386 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 387 cp->geom->name, flags, fmt, td); 388 389 r = flags & FREAD ? 1 : 0; 390 w = flags & FWRITE ? 1 : 0; 391 #ifdef notyet 392 e = flags & O_EXCL ? 1 : 0; 393 #else 394 e = 0; 395 #endif 396 397 /* 398 * This happens on attempt to open a device node with O_EXEC. 399 */ 400 if (r + w + e == 0) 401 return (EINVAL); 402 403 if (w) { 404 /* 405 * When running in very secure mode, do not allow 406 * opens for writing of any disks. 407 */ 408 error = securelevel_ge(td->td_ucred, 2); 409 if (error) 410 return (error); 411 } 412 g_topology_lock(); 413 error = g_access(cp, r, w, e); 414 g_topology_unlock(); 415 if (error == 0) { 416 sc = cp->private; 417 mtx_lock(&sc->sc_mtx); 418 if (sc->sc_open == 0 && sc->sc_active != 0) 419 wakeup(&sc->sc_active); 420 sc->sc_open += r + w + e; 421 mtx_unlock(&sc->sc_mtx); 422 } 423 return(error); 424 } 425 426 static int 427 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 428 { 429 struct g_consumer *cp; 430 struct g_dev_softc *sc; 431 int error, r, w, e; 432 433 cp = dev->si_drv2; 434 if (cp == NULL) 435 return(ENXIO); 436 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 437 cp->geom->name, flags, fmt, td); 438 439 r = flags & FREAD ? -1 : 0; 440 w = flags & FWRITE ? -1 : 0; 441 #ifdef notyet 442 e = flags & O_EXCL ? -1 : 0; 443 #else 444 e = 0; 445 #endif 446 447 /* 448 * The vgonel(9) - caused by eg. forced unmount of devfs - calls 449 * VOP_CLOSE(9) on devfs vnode without any FREAD or FWRITE flags, 450 * which would result in zero deltas, which in turn would cause 451 * panic in g_access(9). 452 * 453 * Note that we cannot zero the counters (ie. do "r = cp->acr" 454 * etc) instead, because the consumer might be opened in another 455 * devfs instance. 456 */ 457 if (r + w + e == 0) 458 return (EINVAL); 459 460 sc = cp->private; 461 mtx_lock(&sc->sc_mtx); 462 sc->sc_open += r + w + e; 463 while (sc->sc_open == 0 && sc->sc_active != 0) 464 msleep(&sc->sc_active, &sc->sc_mtx, 0, "PRIBIO", 0); 465 mtx_unlock(&sc->sc_mtx); 466 g_topology_lock(); 467 error = g_access(cp, r, w, e); 468 g_topology_unlock(); 469 return (error); 470 } 471 472 /* 473 * XXX: Until we have unmessed the ioctl situation, there is a race against 474 * XXX: a concurrent orphanization. We cannot close it by holding topology 475 * XXX: since that would prevent us from doing our job, and stalling events 476 * XXX: will break (actually: stall) the BSD disklabel hacks. 477 */ 478 static int 479 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 480 { 481 struct g_consumer *cp; 482 struct g_provider *pp; 483 off_t offset, length, chunk, odd; 484 int i, error; 485 486 cp = dev->si_drv2; 487 pp = cp->provider; 488 489 error = 0; 490 KASSERT(cp->acr || cp->acw, 491 ("Consumer with zero access count in g_dev_ioctl")); 492 493 i = IOCPARM_LEN(cmd); 494 switch (cmd) { 495 case DIOCGSECTORSIZE: 496 *(u_int *)data = cp->provider->sectorsize; 497 if (*(u_int *)data == 0) 498 error = ENOENT; 499 break; 500 case DIOCGMEDIASIZE: 501 *(off_t *)data = cp->provider->mediasize; 502 if (*(off_t *)data == 0) 503 error = ENOENT; 504 break; 505 case DIOCGFWSECTORS: 506 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 507 if (error == 0 && *(u_int *)data == 0) 508 error = ENOENT; 509 break; 510 case DIOCGFWHEADS: 511 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 512 if (error == 0 && *(u_int *)data == 0) 513 error = ENOENT; 514 break; 515 case DIOCGFRONTSTUFF: 516 error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 517 break; 518 case DIOCSKERNELDUMP: 519 if (*(u_int *)data == 0) 520 error = g_dev_setdumpdev(NULL, td); 521 else 522 error = g_dev_setdumpdev(dev, td); 523 break; 524 case DIOCGFLUSH: 525 error = g_io_flush(cp); 526 break; 527 case DIOCGDELETE: 528 offset = ((off_t *)data)[0]; 529 length = ((off_t *)data)[1]; 530 if ((offset % cp->provider->sectorsize) != 0 || 531 (length % cp->provider->sectorsize) != 0 || length <= 0) { 532 printf("%s: offset=%jd length=%jd\n", __func__, offset, 533 length); 534 error = EINVAL; 535 break; 536 } 537 while (length > 0) { 538 chunk = length; 539 if (g_dev_del_max_sectors != 0 && chunk > 540 g_dev_del_max_sectors * cp->provider->sectorsize) { 541 chunk = g_dev_del_max_sectors * 542 cp->provider->sectorsize; 543 if (cp->provider->stripesize > 0) { 544 odd = (offset + chunk + 545 cp->provider->stripeoffset) % 546 cp->provider->stripesize; 547 if (chunk > odd) 548 chunk -= odd; 549 } 550 } 551 error = g_delete_data(cp, offset, chunk); 552 length -= chunk; 553 offset += chunk; 554 if (error) 555 break; 556 /* 557 * Since the request size can be large, the service 558 * time can be is likewise. We make this ioctl 559 * interruptible by checking for signals for each bio. 560 */ 561 if (SIGPENDING(td)) 562 break; 563 } 564 break; 565 case DIOCGIDENT: 566 error = g_io_getattr("GEOM::ident", cp, &i, data); 567 break; 568 case DIOCGPROVIDERNAME: 569 if (pp == NULL) 570 return (ENOENT); 571 strlcpy(data, pp->name, i); 572 break; 573 case DIOCGSTRIPESIZE: 574 *(off_t *)data = cp->provider->stripesize; 575 break; 576 case DIOCGSTRIPEOFFSET: 577 *(off_t *)data = cp->provider->stripeoffset; 578 break; 579 case DIOCGPHYSPATH: 580 error = g_io_getattr("GEOM::physpath", cp, &i, data); 581 if (error == 0 && *(char *)data == '\0') 582 error = ENOENT; 583 break; 584 case DIOCGATTR: { 585 struct diocgattr_arg *arg = (struct diocgattr_arg *)data; 586 587 if (arg->len > sizeof(arg->value)) { 588 error = EINVAL; 589 break; 590 } 591 error = g_io_getattr(arg->name, cp, &arg->len, &arg->value); 592 break; 593 } 594 default: 595 if (cp->provider->geom->ioctl != NULL) { 596 error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td); 597 } else { 598 error = ENOIOCTL; 599 } 600 } 601 602 return (error); 603 } 604 605 static void 606 g_dev_done(struct bio *bp2) 607 { 608 struct g_consumer *cp; 609 struct g_dev_softc *sc; 610 struct bio *bp; 611 int destroy; 612 613 cp = bp2->bio_from; 614 sc = cp->private; 615 bp = bp2->bio_parent; 616 bp->bio_error = bp2->bio_error; 617 bp->bio_completed = bp2->bio_completed; 618 bp->bio_resid = bp->bio_length - bp2->bio_completed; 619 if (bp2->bio_error != 0) { 620 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 621 bp2, bp2->bio_error); 622 bp->bio_flags |= BIO_ERROR; 623 } else { 624 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 625 bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed); 626 } 627 g_destroy_bio(bp2); 628 destroy = 0; 629 mtx_lock(&sc->sc_mtx); 630 if ((--sc->sc_active) == 0) { 631 if (sc->sc_open == 0) 632 wakeup(&sc->sc_active); 633 if (sc->sc_dev == NULL) 634 destroy = 1; 635 } 636 mtx_unlock(&sc->sc_mtx); 637 if (destroy) 638 g_post_event(g_dev_destroy, cp, M_NOWAIT, NULL); 639 biodone(bp); 640 } 641 642 static void 643 g_dev_strategy(struct bio *bp) 644 { 645 struct g_consumer *cp; 646 struct bio *bp2; 647 struct cdev *dev; 648 struct g_dev_softc *sc; 649 650 KASSERT(bp->bio_cmd == BIO_READ || 651 bp->bio_cmd == BIO_WRITE || 652 bp->bio_cmd == BIO_DELETE || 653 bp->bio_cmd == BIO_FLUSH, 654 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 655 dev = bp->bio_dev; 656 cp = dev->si_drv2; 657 sc = cp->private; 658 KASSERT(cp->acr || cp->acw, 659 ("Consumer with zero access count in g_dev_strategy")); 660 #ifdef INVARIANTS 661 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 662 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 663 bp->bio_resid = bp->bio_bcount; 664 biofinish(bp, NULL, EINVAL); 665 return; 666 } 667 #endif 668 mtx_lock(&sc->sc_mtx); 669 KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy")); 670 sc->sc_active++; 671 mtx_unlock(&sc->sc_mtx); 672 673 for (;;) { 674 /* 675 * XXX: This is not an ideal solution, but I belive it to 676 * XXX: deadlock safe, all things considered. 677 */ 678 bp2 = g_clone_bio(bp); 679 if (bp2 != NULL) 680 break; 681 pause("gdstrat", hz / 10); 682 } 683 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 684 bp2->bio_done = g_dev_done; 685 g_trace(G_T_BIO, 686 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 687 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 688 bp2->bio_data, bp2->bio_cmd); 689 g_io_request(bp2, cp); 690 KASSERT(cp->acr || cp->acw, 691 ("g_dev_strategy raced with g_dev_close and lost")); 692 693 } 694 695 /* 696 * g_dev_callback() 697 * 698 * Called by devfs when asynchronous device destruction is completed. 699 * - Mark that we have no attached device any more. 700 * - If there are no outstanding requests, schedule geom destruction. 701 * Otherwise destruction will be scheduled later by g_dev_done(). 702 */ 703 704 static void 705 g_dev_callback(void *arg) 706 { 707 struct g_consumer *cp; 708 struct g_dev_softc *sc; 709 int destroy; 710 711 cp = arg; 712 sc = cp->private; 713 g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name); 714 715 mtx_lock(&sc->sc_mtx); 716 sc->sc_dev = NULL; 717 sc->sc_alias = NULL; 718 destroy = (sc->sc_active == 0); 719 mtx_unlock(&sc->sc_mtx); 720 if (destroy) 721 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 722 } 723 724 /* 725 * g_dev_orphan() 726 * 727 * Called from below when the provider orphaned us. 728 * - Clear any dump settings. 729 * - Request asynchronous device destruction to prevent any more requests 730 * from coming in. The provider is already marked with an error, so 731 * anything which comes in in the interrim will be returned immediately. 732 */ 733 734 static void 735 g_dev_orphan(struct g_consumer *cp) 736 { 737 struct cdev *dev; 738 struct g_dev_softc *sc; 739 740 g_topology_assert(); 741 sc = cp->private; 742 dev = sc->sc_dev; 743 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name); 744 745 /* Reset any dump-area set on this device */ 746 if (dev->si_flags & SI_DUMPDEV) 747 (void)set_dumper(NULL, NULL, curthread); 748 749 /* Destroy the struct cdev *so we get no more requests */ 750 destroy_dev_sched_cb(dev, g_dev_callback, cp); 751 } 752 753 DECLARE_GEOM_CLASS(g_dev_class, g_dev);
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