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: releng/10.3/sys/geom/geom_dev.c 291548 2015-12-01 00:53:03Z smh $"); 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_attrchanged(struct g_consumer *cp, const char *attr) 226 { 227 struct g_dev_softc *sc; 228 struct cdev *dev; 229 char buf[SPECNAMELEN + 6]; 230 231 sc = cp->private; 232 if (strcmp(attr, "GEOM::media") == 0) { 233 dev = sc->sc_dev; 234 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 235 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 236 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, M_WAITOK); 237 dev = sc->sc_alias; 238 if (dev != NULL) { 239 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 240 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, 241 M_WAITOK); 242 devctl_notify_f("GEOM", "DEV", "MEDIACHANGE", buf, 243 M_WAITOK); 244 } 245 return; 246 } 247 248 if (strcmp(attr, "GEOM::physpath") != 0) 249 return; 250 251 if (g_access(cp, 1, 0, 0) == 0) { 252 char *physpath; 253 int error, physpath_len; 254 255 physpath_len = MAXPATHLEN; 256 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO); 257 error = 258 g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath); 259 g_access(cp, -1, 0, 0); 260 if (error == 0 && strlen(physpath) != 0) { 261 struct cdev *old_alias_dev; 262 struct cdev **alias_devp; 263 264 dev = sc->sc_dev; 265 old_alias_dev = sc->sc_alias; 266 alias_devp = (struct cdev **)&sc->sc_alias; 267 make_dev_physpath_alias(MAKEDEV_WAITOK, alias_devp, 268 dev, old_alias_dev, physpath); 269 } else if (sc->sc_alias) { 270 destroy_dev((struct cdev *)sc->sc_alias); 271 sc->sc_alias = NULL; 272 } 273 g_free(physpath); 274 } 275 } 276 277 struct g_provider * 278 g_dev_getprovider(struct cdev *dev) 279 { 280 struct g_consumer *cp; 281 282 g_topology_assert(); 283 if (dev == NULL) 284 return (NULL); 285 if (dev->si_devsw != &g_dev_cdevsw) 286 return (NULL); 287 cp = dev->si_drv2; 288 return (cp->provider); 289 } 290 291 static struct g_geom * 292 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 293 { 294 struct g_geom *gp; 295 struct g_consumer *cp; 296 struct g_dev_softc *sc; 297 int error, len; 298 struct cdev *dev, *adev; 299 char buf[SPECNAMELEN + 6], *val; 300 301 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 302 g_topology_assert(); 303 gp = g_new_geomf(mp, "%s", pp->name); 304 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 305 mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF); 306 cp = g_new_consumer(gp); 307 cp->private = sc; 308 cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE; 309 error = g_attach(cp, pp); 310 KASSERT(error == 0, 311 ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 312 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &dev, 313 &g_dev_cdevsw, NULL, UID_ROOT, GID_OPERATOR, 0640, "%s", gp->name); 314 if (error != 0) { 315 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n", 316 __func__, gp->name, error); 317 g_detach(cp); 318 g_destroy_consumer(cp); 319 g_destroy_geom(gp); 320 mtx_destroy(&sc->sc_mtx); 321 g_free(sc); 322 return (NULL); 323 } 324 dev->si_flags |= SI_UNMAPPED; 325 sc->sc_dev = dev; 326 327 /* Search for device alias name and create it if found. */ 328 adev = NULL; 329 for (len = MIN(strlen(gp->name), sizeof(buf) - 15); len > 0; len--) { 330 snprintf(buf, sizeof(buf), "kern.devalias.%s", gp->name); 331 buf[14 + len] = 0; 332 val = getenv(buf); 333 if (val != NULL) { 334 snprintf(buf, sizeof(buf), "%s%s", 335 val, gp->name + len); 336 freeenv(val); 337 make_dev_alias_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, 338 &adev, dev, "%s", buf); 339 adev->si_flags |= SI_UNMAPPED; 340 break; 341 } 342 } 343 344 dev->si_iosize_max = MAXPHYS; 345 dev->si_drv2 = cp; 346 error = init_dumpdev(dev); 347 if (error != 0) 348 printf("%s: init_dumpdev() failed (gp->name=%s, error=%d)\n", 349 __func__, gp->name, error); 350 if (adev != NULL) { 351 adev->si_iosize_max = MAXPHYS; 352 adev->si_drv2 = cp; 353 init_dumpdev(adev); 354 } 355 356 g_dev_attrchanged(cp, "GEOM::physpath"); 357 snprintf(buf, sizeof(buf), "cdev=%s", gp->name); 358 devctl_notify_f("GEOM", "DEV", "CREATE", buf, M_WAITOK); 359 360 return (gp); 361 } 362 363 static int 364 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 365 { 366 struct g_consumer *cp; 367 struct g_dev_softc *sc; 368 int error, r, w, e; 369 370 cp = dev->si_drv2; 371 if (cp == NULL) 372 return(ENXIO); /* g_dev_taste() not done yet */ 373 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 374 cp->geom->name, flags, fmt, td); 375 376 r = flags & FREAD ? 1 : 0; 377 w = flags & FWRITE ? 1 : 0; 378 #ifdef notyet 379 e = flags & O_EXCL ? 1 : 0; 380 #else 381 e = 0; 382 #endif 383 384 /* 385 * This happens on attempt to open a device node with O_EXEC. 386 */ 387 if (r + w + e == 0) 388 return (EINVAL); 389 390 if (w) { 391 /* 392 * When running in very secure mode, do not allow 393 * opens for writing of any disks. 394 */ 395 error = securelevel_ge(td->td_ucred, 2); 396 if (error) 397 return (error); 398 } 399 g_topology_lock(); 400 error = g_access(cp, r, w, e); 401 g_topology_unlock(); 402 if (error == 0) { 403 sc = cp->private; 404 mtx_lock(&sc->sc_mtx); 405 if (sc->sc_open == 0 && sc->sc_active != 0) 406 wakeup(&sc->sc_active); 407 sc->sc_open += r + w + e; 408 mtx_unlock(&sc->sc_mtx); 409 } 410 return(error); 411 } 412 413 static int 414 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 415 { 416 struct g_consumer *cp; 417 struct g_dev_softc *sc; 418 int error, r, w, e; 419 420 cp = dev->si_drv2; 421 if (cp == NULL) 422 return(ENXIO); 423 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 424 cp->geom->name, flags, fmt, td); 425 426 r = flags & FREAD ? -1 : 0; 427 w = flags & FWRITE ? -1 : 0; 428 #ifdef notyet 429 e = flags & O_EXCL ? -1 : 0; 430 #else 431 e = 0; 432 #endif 433 434 /* 435 * The vgonel(9) - caused by eg. forced unmount of devfs - calls 436 * VOP_CLOSE(9) on devfs vnode without any FREAD or FWRITE flags, 437 * which would result in zero deltas, which in turn would cause 438 * panic in g_access(9). 439 * 440 * Note that we cannot zero the counters (ie. do "r = cp->acr" 441 * etc) instead, because the consumer might be opened in another 442 * devfs instance. 443 */ 444 if (r + w + e == 0) 445 return (EINVAL); 446 447 sc = cp->private; 448 mtx_lock(&sc->sc_mtx); 449 sc->sc_open += r + w + e; 450 while (sc->sc_open == 0 && sc->sc_active != 0) 451 msleep(&sc->sc_active, &sc->sc_mtx, 0, "PRIBIO", 0); 452 mtx_unlock(&sc->sc_mtx); 453 g_topology_lock(); 454 error = g_access(cp, r, w, e); 455 g_topology_unlock(); 456 return (error); 457 } 458 459 /* 460 * XXX: Until we have unmessed the ioctl situation, there is a race against 461 * XXX: a concurrent orphanization. We cannot close it by holding topology 462 * XXX: since that would prevent us from doing our job, and stalling events 463 * XXX: will break (actually: stall) the BSD disklabel hacks. 464 */ 465 static int 466 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 467 { 468 struct g_consumer *cp; 469 struct g_provider *pp; 470 off_t offset, length, chunk; 471 int i, error; 472 473 cp = dev->si_drv2; 474 pp = cp->provider; 475 476 error = 0; 477 KASSERT(cp->acr || cp->acw, 478 ("Consumer with zero access count in g_dev_ioctl")); 479 480 i = IOCPARM_LEN(cmd); 481 switch (cmd) { 482 case DIOCGSECTORSIZE: 483 *(u_int *)data = cp->provider->sectorsize; 484 if (*(u_int *)data == 0) 485 error = ENOENT; 486 break; 487 case DIOCGMEDIASIZE: 488 *(off_t *)data = cp->provider->mediasize; 489 if (*(off_t *)data == 0) 490 error = ENOENT; 491 break; 492 case DIOCGFWSECTORS: 493 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 494 if (error == 0 && *(u_int *)data == 0) 495 error = ENOENT; 496 break; 497 case DIOCGFWHEADS: 498 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 499 if (error == 0 && *(u_int *)data == 0) 500 error = ENOENT; 501 break; 502 case DIOCGFRONTSTUFF: 503 error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 504 break; 505 case DIOCSKERNELDUMP: 506 if (*(u_int *)data == 0) 507 error = g_dev_setdumpdev(NULL, td); 508 else 509 error = g_dev_setdumpdev(dev, td); 510 break; 511 case DIOCGFLUSH: 512 error = g_io_flush(cp); 513 break; 514 case DIOCGDELETE: 515 offset = ((off_t *)data)[0]; 516 length = ((off_t *)data)[1]; 517 if ((offset % cp->provider->sectorsize) != 0 || 518 (length % cp->provider->sectorsize) != 0 || length <= 0) { 519 printf("%s: offset=%jd length=%jd\n", __func__, offset, 520 length); 521 error = EINVAL; 522 break; 523 } 524 while (length > 0) { 525 chunk = length; 526 if (g_dev_del_max_sectors != 0 && chunk > 527 g_dev_del_max_sectors * cp->provider->sectorsize) { 528 chunk = g_dev_del_max_sectors * 529 cp->provider->sectorsize; 530 } 531 error = g_delete_data(cp, offset, chunk); 532 length -= chunk; 533 offset += chunk; 534 if (error) 535 break; 536 /* 537 * Since the request size can be large, the service 538 * time can be is likewise. We make this ioctl 539 * interruptible by checking for signals for each bio. 540 */ 541 if (SIGPENDING(td)) 542 break; 543 } 544 break; 545 case DIOCGIDENT: 546 error = g_io_getattr("GEOM::ident", cp, &i, data); 547 break; 548 case DIOCGPROVIDERNAME: 549 if (pp == NULL) 550 return (ENOENT); 551 strlcpy(data, pp->name, i); 552 break; 553 case DIOCGSTRIPESIZE: 554 *(off_t *)data = cp->provider->stripesize; 555 break; 556 case DIOCGSTRIPEOFFSET: 557 *(off_t *)data = cp->provider->stripeoffset; 558 break; 559 case DIOCGPHYSPATH: 560 error = g_io_getattr("GEOM::physpath", cp, &i, data); 561 if (error == 0 && *(char *)data == '\0') 562 error = ENOENT; 563 break; 564 case DIOCGATTR: { 565 struct diocgattr_arg *arg = (struct diocgattr_arg *)data; 566 567 if (arg->len > sizeof(arg->value)) { 568 error = EINVAL; 569 break; 570 } 571 error = g_io_getattr(arg->name, cp, &arg->len, &arg->value); 572 break; 573 } 574 default: 575 if (cp->provider->geom->ioctl != NULL) { 576 error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td); 577 } else { 578 error = ENOIOCTL; 579 } 580 } 581 582 return (error); 583 } 584 585 static void 586 g_dev_done(struct bio *bp2) 587 { 588 struct g_consumer *cp; 589 struct g_dev_softc *sc; 590 struct bio *bp; 591 int destroy; 592 593 cp = bp2->bio_from; 594 sc = cp->private; 595 bp = bp2->bio_parent; 596 bp->bio_error = bp2->bio_error; 597 bp->bio_completed = bp2->bio_completed; 598 bp->bio_resid = bp->bio_length - bp2->bio_completed; 599 if (bp2->bio_error != 0) { 600 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 601 bp2, bp2->bio_error); 602 bp->bio_flags |= BIO_ERROR; 603 } else { 604 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 605 bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed); 606 } 607 g_destroy_bio(bp2); 608 destroy = 0; 609 mtx_lock(&sc->sc_mtx); 610 if ((--sc->sc_active) == 0) { 611 if (sc->sc_open == 0) 612 wakeup(&sc->sc_active); 613 if (sc->sc_dev == NULL) 614 destroy = 1; 615 } 616 mtx_unlock(&sc->sc_mtx); 617 if (destroy) 618 g_post_event(g_dev_destroy, cp, M_NOWAIT, NULL); 619 biodone(bp); 620 } 621 622 static void 623 g_dev_strategy(struct bio *bp) 624 { 625 struct g_consumer *cp; 626 struct bio *bp2; 627 struct cdev *dev; 628 struct g_dev_softc *sc; 629 630 KASSERT(bp->bio_cmd == BIO_READ || 631 bp->bio_cmd == BIO_WRITE || 632 bp->bio_cmd == BIO_DELETE || 633 bp->bio_cmd == BIO_FLUSH, 634 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 635 dev = bp->bio_dev; 636 cp = dev->si_drv2; 637 sc = cp->private; 638 KASSERT(cp->acr || cp->acw, 639 ("Consumer with zero access count in g_dev_strategy")); 640 #ifdef INVARIANTS 641 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 642 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 643 bp->bio_resid = bp->bio_bcount; 644 biofinish(bp, NULL, EINVAL); 645 return; 646 } 647 #endif 648 mtx_lock(&sc->sc_mtx); 649 KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy")); 650 sc->sc_active++; 651 mtx_unlock(&sc->sc_mtx); 652 653 for (;;) { 654 /* 655 * XXX: This is not an ideal solution, but I belive it to 656 * XXX: deadlock safe, all things considered. 657 */ 658 bp2 = g_clone_bio(bp); 659 if (bp2 != NULL) 660 break; 661 pause("gdstrat", hz / 10); 662 } 663 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 664 bp2->bio_done = g_dev_done; 665 g_trace(G_T_BIO, 666 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 667 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 668 bp2->bio_data, bp2->bio_cmd); 669 g_io_request(bp2, cp); 670 KASSERT(cp->acr || cp->acw, 671 ("g_dev_strategy raced with g_dev_close and lost")); 672 673 } 674 675 /* 676 * g_dev_callback() 677 * 678 * Called by devfs when asynchronous device destruction is completed. 679 * - Mark that we have no attached device any more. 680 * - If there are no outstanding requests, schedule geom destruction. 681 * Otherwise destruction will be scheduled later by g_dev_done(). 682 */ 683 684 static void 685 g_dev_callback(void *arg) 686 { 687 struct g_consumer *cp; 688 struct g_dev_softc *sc; 689 int destroy; 690 691 cp = arg; 692 sc = cp->private; 693 g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name); 694 695 mtx_lock(&sc->sc_mtx); 696 sc->sc_dev = NULL; 697 sc->sc_alias = NULL; 698 destroy = (sc->sc_active == 0); 699 mtx_unlock(&sc->sc_mtx); 700 if (destroy) 701 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 702 } 703 704 /* 705 * g_dev_orphan() 706 * 707 * Called from below when the provider orphaned us. 708 * - Clear any dump settings. 709 * - Request asynchronous device destruction to prevent any more requests 710 * from coming in. The provider is already marked with an error, so 711 * anything which comes in in the interrim will be returned immediately. 712 */ 713 714 static void 715 g_dev_orphan(struct g_consumer *cp) 716 { 717 struct cdev *dev; 718 struct g_dev_softc *sc; 719 720 g_topology_assert(); 721 sc = cp->private; 722 dev = sc->sc_dev; 723 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name); 724 725 /* Reset any dump-area set on this device */ 726 if (dev->si_flags & SI_DUMPDEV) 727 (void)set_dumper(NULL, NULL, curthread); 728 729 /* Destroy the struct cdev *so we get no more requests */ 730 destroy_dev_sched_cb(dev, g_dev_callback, cp); 731 } 732 733 DECLARE_GEOM_CLASS(g_dev_class, g_dev);
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