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/9.2/sys/geom/geom_dev.c 251942 2013-06-18 14:46:42Z scottl $"); 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 | D_UNMAPPED_IO, 83 }; 84 85 static g_taste_t g_dev_taste; 86 static g_orphan_t g_dev_orphan; 87 static g_attrchanged_t g_dev_attrchanged; 88 89 static struct g_class g_dev_class = { 90 .name = "DEV", 91 .version = G_VERSION, 92 .taste = g_dev_taste, 93 .orphan = g_dev_orphan, 94 .attrchanged = g_dev_attrchanged 95 }; 96 97 /* 98 * We target 262144 (8 x 32768) sectors by default as this significantly 99 * increases the throughput on commonly used SSD's with a marginal 100 * increase in non-interruptible request latency. 101 */ 102 static uint64_t g_dev_del_max_sectors = 262144; 103 SYSCTL_DECL(_kern_geom); 104 SYSCTL_NODE(_kern_geom, OID_AUTO, dev, CTLFLAG_RW, 0, "GEOM_DEV stuff"); 105 SYSCTL_QUAD(_kern_geom_dev, OID_AUTO, delete_max_sectors, CTLFLAG_RW, 106 &g_dev_del_max_sectors, 0, "Maximum number of sectors in a single " 107 "delete request sent to the provider. Larger requests are chunked " 108 "so they can be interrupted. (0 = disable chunking)"); 109 110 static void 111 g_dev_destroy(void *arg, int flags __unused) 112 { 113 struct g_consumer *cp; 114 struct g_geom *gp; 115 struct g_dev_softc *sc; 116 117 g_topology_assert(); 118 cp = arg; 119 gp = cp->geom; 120 sc = cp->private; 121 g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name); 122 if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0) 123 g_access(cp, -cp->acr, -cp->acw, -cp->ace); 124 g_detach(cp); 125 g_destroy_consumer(cp); 126 g_destroy_geom(gp); 127 mtx_destroy(&sc->sc_mtx); 128 g_free(sc); 129 } 130 131 void 132 g_dev_print(void) 133 { 134 struct g_geom *gp; 135 char const *p = ""; 136 137 LIST_FOREACH(gp, &g_dev_class.geom, geom) { 138 printf("%s%s", p, gp->name); 139 p = " "; 140 } 141 printf("\n"); 142 } 143 144 static void 145 g_dev_attrchanged(struct g_consumer *cp, const char *attr) 146 { 147 struct g_dev_softc *sc; 148 struct cdev *dev; 149 char buf[SPECNAMELEN + 6]; 150 151 sc = cp->private; 152 if (strcmp(attr, "GEOM::media") == 0) { 153 dev = sc->sc_dev; 154 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 155 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, M_WAITOK); 156 dev = sc->sc_alias; 157 if (dev != NULL) { 158 snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name); 159 devctl_notify_f("DEVFS", "CDEV", "MEDIACHANGE", buf, 160 M_WAITOK); 161 } 162 return; 163 } 164 165 if (strcmp(attr, "GEOM::physpath") != 0) 166 return; 167 168 if (g_access(cp, 1, 0, 0) == 0) { 169 char *physpath; 170 int error, physpath_len; 171 172 physpath_len = MAXPATHLEN; 173 physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO); 174 error = 175 g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath); 176 g_access(cp, -1, 0, 0); 177 if (error == 0 && strlen(physpath) != 0) { 178 struct cdev *old_alias_dev; 179 struct cdev **alias_devp; 180 181 dev = sc->sc_dev; 182 old_alias_dev = sc->sc_alias; 183 alias_devp = (struct cdev **)&sc->sc_alias; 184 make_dev_physpath_alias(MAKEDEV_WAITOK, alias_devp, 185 dev, old_alias_dev, physpath); 186 } else if (sc->sc_alias) { 187 destroy_dev((struct cdev *)sc->sc_alias); 188 sc->sc_alias = NULL; 189 } 190 g_free(physpath); 191 } 192 } 193 194 struct g_provider * 195 g_dev_getprovider(struct cdev *dev) 196 { 197 struct g_consumer *cp; 198 199 g_topology_assert(); 200 if (dev == NULL) 201 return (NULL); 202 if (dev->si_devsw != &g_dev_cdevsw) 203 return (NULL); 204 cp = dev->si_drv2; 205 return (cp->provider); 206 } 207 208 static struct g_geom * 209 g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused) 210 { 211 struct g_geom *gp; 212 struct g_consumer *cp; 213 struct g_dev_softc *sc; 214 int error, len; 215 struct cdev *dev, *adev; 216 char buf[64], *val; 217 218 g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name); 219 g_topology_assert(); 220 gp = g_new_geomf(mp, "%s", pp->name); 221 sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO); 222 mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF); 223 cp = g_new_consumer(gp); 224 cp->private = sc; 225 error = g_attach(cp, pp); 226 KASSERT(error == 0, 227 ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error)); 228 error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &dev, 229 &g_dev_cdevsw, NULL, UID_ROOT, GID_OPERATOR, 0640, "%s", gp->name); 230 if (error != 0) { 231 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n", 232 __func__, gp->name, error); 233 g_detach(cp); 234 g_destroy_consumer(cp); 235 g_destroy_geom(gp); 236 mtx_destroy(&sc->sc_mtx); 237 g_free(sc); 238 return (NULL); 239 } 240 sc->sc_dev = dev; 241 242 /* Search for device alias name and create it if found. */ 243 adev = NULL; 244 for (len = MIN(strlen(gp->name), sizeof(buf) - 15); len > 0; len--) { 245 snprintf(buf, sizeof(buf), "kern.devalias.%s", gp->name); 246 buf[14 + len] = 0; 247 val = getenv(buf); 248 if (val != NULL) { 249 snprintf(buf, sizeof(buf), "%s%s", 250 val, gp->name + len); 251 freeenv(val); 252 make_dev_alias_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, 253 &adev, dev, "%s", buf); 254 break; 255 } 256 } 257 258 if (pp->flags & G_PF_CANDELETE) 259 dev->si_flags |= SI_CANDELETE; 260 dev->si_iosize_max = MAXPHYS; 261 dev->si_drv2 = cp; 262 if (adev != NULL) { 263 if (pp->flags & G_PF_CANDELETE) 264 adev->si_flags |= SI_CANDELETE; 265 adev->si_iosize_max = MAXPHYS; 266 adev->si_drv2 = cp; 267 } 268 269 g_dev_attrchanged(cp, "GEOM::physpath"); 270 271 return (gp); 272 } 273 274 static int 275 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td) 276 { 277 struct g_consumer *cp; 278 struct g_dev_softc *sc; 279 int error, r, w, e; 280 281 cp = dev->si_drv2; 282 if (cp == NULL) 283 return(ENXIO); /* g_dev_taste() not done yet */ 284 g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)", 285 cp->geom->name, flags, fmt, td); 286 287 r = flags & FREAD ? 1 : 0; 288 w = flags & FWRITE ? 1 : 0; 289 #ifdef notyet 290 e = flags & O_EXCL ? 1 : 0; 291 #else 292 e = 0; 293 #endif 294 if (w) { 295 /* 296 * When running in very secure mode, do not allow 297 * opens for writing of any disks. 298 */ 299 error = securelevel_ge(td->td_ucred, 2); 300 if (error) 301 return (error); 302 } 303 g_topology_lock(); 304 error = g_access(cp, r, w, e); 305 g_topology_unlock(); 306 if (error == 0) { 307 sc = cp->private; 308 mtx_lock(&sc->sc_mtx); 309 if (sc->sc_open == 0 && sc->sc_active != 0) 310 wakeup(&sc->sc_active); 311 sc->sc_open += r + w + e; 312 mtx_unlock(&sc->sc_mtx); 313 } 314 return(error); 315 } 316 317 static int 318 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td) 319 { 320 struct g_consumer *cp; 321 struct g_dev_softc *sc; 322 int error, r, w, e; 323 324 cp = dev->si_drv2; 325 if (cp == NULL) 326 return(ENXIO); 327 g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)", 328 cp->geom->name, flags, fmt, td); 329 330 r = flags & FREAD ? -1 : 0; 331 w = flags & FWRITE ? -1 : 0; 332 #ifdef notyet 333 e = flags & O_EXCL ? -1 : 0; 334 #else 335 e = 0; 336 #endif 337 sc = cp->private; 338 mtx_lock(&sc->sc_mtx); 339 sc->sc_open += r + w + e; 340 while (sc->sc_open == 0 && sc->sc_active != 0) 341 msleep(&sc->sc_active, &sc->sc_mtx, 0, "PRIBIO", 0); 342 mtx_unlock(&sc->sc_mtx); 343 g_topology_lock(); 344 error = g_access(cp, r, w, e); 345 g_topology_unlock(); 346 return (error); 347 } 348 349 /* 350 * XXX: Until we have unmessed the ioctl situation, there is a race against 351 * XXX: a concurrent orphanization. We cannot close it by holding topology 352 * XXX: since that would prevent us from doing our job, and stalling events 353 * XXX: will break (actually: stall) the BSD disklabel hacks. 354 */ 355 static int 356 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 357 { 358 struct g_consumer *cp; 359 struct g_provider *pp; 360 struct g_kerneldump kd; 361 off_t offset, length, chunk; 362 int i, error; 363 u_int u; 364 365 cp = dev->si_drv2; 366 pp = cp->provider; 367 368 error = 0; 369 KASSERT(cp->acr || cp->acw, 370 ("Consumer with zero access count in g_dev_ioctl")); 371 372 i = IOCPARM_LEN(cmd); 373 switch (cmd) { 374 case DIOCGSECTORSIZE: 375 *(u_int *)data = cp->provider->sectorsize; 376 if (*(u_int *)data == 0) 377 error = ENOENT; 378 break; 379 case DIOCGMEDIASIZE: 380 *(off_t *)data = cp->provider->mediasize; 381 if (*(off_t *)data == 0) 382 error = ENOENT; 383 break; 384 case DIOCGFWSECTORS: 385 error = g_io_getattr("GEOM::fwsectors", cp, &i, data); 386 if (error == 0 && *(u_int *)data == 0) 387 error = ENOENT; 388 break; 389 case DIOCGFWHEADS: 390 error = g_io_getattr("GEOM::fwheads", cp, &i, data); 391 if (error == 0 && *(u_int *)data == 0) 392 error = ENOENT; 393 break; 394 case DIOCGFRONTSTUFF: 395 error = g_io_getattr("GEOM::frontstuff", cp, &i, data); 396 break; 397 case DIOCSKERNELDUMP: 398 u = *((u_int *)data); 399 if (!u) { 400 set_dumper(NULL); 401 error = 0; 402 break; 403 } 404 kd.offset = 0; 405 kd.length = OFF_MAX; 406 i = sizeof kd; 407 error = g_io_getattr("GEOM::kerneldump", cp, &i, &kd); 408 if (!error) { 409 error = set_dumper(&kd.di); 410 if (!error) 411 dev->si_flags |= SI_DUMPDEV; 412 } 413 break; 414 case DIOCGFLUSH: 415 error = g_io_flush(cp); 416 break; 417 case DIOCGDELETE: 418 offset = ((off_t *)data)[0]; 419 length = ((off_t *)data)[1]; 420 if ((offset % cp->provider->sectorsize) != 0 || 421 (length % cp->provider->sectorsize) != 0 || length <= 0) { 422 printf("%s: offset=%jd length=%jd\n", __func__, offset, 423 length); 424 error = EINVAL; 425 break; 426 } 427 while (length > 0) { 428 chunk = length; 429 if (g_dev_del_max_sectors != 0 && chunk > 430 g_dev_del_max_sectors * cp->provider->sectorsize) { 431 chunk = g_dev_del_max_sectors * 432 cp->provider->sectorsize; 433 } 434 error = g_delete_data(cp, offset, chunk); 435 length -= chunk; 436 offset += chunk; 437 if (error) 438 break; 439 /* 440 * Since the request size can be large, the service 441 * time can be is likewise. We make this ioctl 442 * interruptible by checking for signals for each bio. 443 */ 444 if (SIGPENDING(td)) 445 break; 446 } 447 break; 448 case DIOCGIDENT: 449 error = g_io_getattr("GEOM::ident", cp, &i, data); 450 break; 451 case DIOCGPROVIDERNAME: 452 if (pp == NULL) 453 return (ENOENT); 454 strlcpy(data, pp->name, i); 455 break; 456 case DIOCGSTRIPESIZE: 457 *(off_t *)data = cp->provider->stripesize; 458 break; 459 case DIOCGSTRIPEOFFSET: 460 *(off_t *)data = cp->provider->stripeoffset; 461 break; 462 case DIOCGPHYSPATH: 463 error = g_io_getattr("GEOM::physpath", cp, &i, data); 464 if (error == 0 && *(char *)data == '\0') 465 error = ENOENT; 466 break; 467 default: 468 if (cp->provider->geom->ioctl != NULL) { 469 error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td); 470 } else { 471 error = ENOIOCTL; 472 } 473 } 474 475 return (error); 476 } 477 478 static void 479 g_dev_done(struct bio *bp2) 480 { 481 struct g_consumer *cp; 482 struct g_dev_softc *sc; 483 struct bio *bp; 484 int destroy; 485 486 cp = bp2->bio_from; 487 sc = cp->private; 488 bp = bp2->bio_parent; 489 bp->bio_error = bp2->bio_error; 490 if (bp->bio_error != 0) { 491 g_trace(G_T_BIO, "g_dev_done(%p) had error %d", 492 bp2, bp->bio_error); 493 bp->bio_flags |= BIO_ERROR; 494 } else { 495 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd", 496 bp2, bp, bp->bio_resid, (intmax_t)bp2->bio_completed); 497 } 498 bp->bio_resid = bp->bio_length - bp2->bio_completed; 499 bp->bio_completed = bp2->bio_completed; 500 g_destroy_bio(bp2); 501 destroy = 0; 502 mtx_lock(&sc->sc_mtx); 503 if ((--sc->sc_active) == 0) { 504 if (sc->sc_open == 0) 505 wakeup(&sc->sc_active); 506 if (sc->sc_dev == NULL) 507 destroy = 1; 508 } 509 mtx_unlock(&sc->sc_mtx); 510 if (destroy) 511 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 512 biodone(bp); 513 } 514 515 static void 516 g_dev_strategy(struct bio *bp) 517 { 518 struct g_consumer *cp; 519 struct bio *bp2; 520 struct cdev *dev; 521 struct g_dev_softc *sc; 522 523 KASSERT(bp->bio_cmd == BIO_READ || 524 bp->bio_cmd == BIO_WRITE || 525 bp->bio_cmd == BIO_DELETE || 526 bp->bio_cmd == BIO_FLUSH, 527 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd)); 528 dev = bp->bio_dev; 529 cp = dev->si_drv2; 530 sc = cp->private; 531 KASSERT(cp->acr || cp->acw, 532 ("Consumer with zero access count in g_dev_strategy")); 533 #ifdef INVARIANTS 534 if ((bp->bio_offset % cp->provider->sectorsize) != 0 || 535 (bp->bio_bcount % cp->provider->sectorsize) != 0) { 536 bp->bio_resid = bp->bio_bcount; 537 biofinish(bp, NULL, EINVAL); 538 return; 539 } 540 #endif 541 mtx_lock(&sc->sc_mtx); 542 KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy")); 543 sc->sc_active++; 544 mtx_unlock(&sc->sc_mtx); 545 546 for (;;) { 547 /* 548 * XXX: This is not an ideal solution, but I belive it to 549 * XXX: deadlock safe, all things considered. 550 */ 551 bp2 = g_clone_bio(bp); 552 if (bp2 != NULL) 553 break; 554 pause("gdstrat", hz / 10); 555 } 556 KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place")); 557 bp2->bio_done = g_dev_done; 558 g_trace(G_T_BIO, 559 "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d", 560 bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length, 561 bp2->bio_data, bp2->bio_cmd); 562 g_io_request(bp2, cp); 563 KASSERT(cp->acr || cp->acw, 564 ("g_dev_strategy raced with g_dev_close and lost")); 565 566 } 567 568 /* 569 * g_dev_callback() 570 * 571 * Called by devfs when asynchronous device destruction is completed. 572 * - Mark that we have no attached device any more. 573 * - If there are no outstanding requests, schedule geom destruction. 574 * Otherwise destruction will be scheduled later by g_dev_done(). 575 */ 576 577 static void 578 g_dev_callback(void *arg) 579 { 580 struct g_consumer *cp; 581 struct g_dev_softc *sc; 582 int destroy; 583 584 cp = arg; 585 sc = cp->private; 586 g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name); 587 588 mtx_lock(&sc->sc_mtx); 589 sc->sc_dev = NULL; 590 sc->sc_alias = NULL; 591 destroy = (sc->sc_active == 0); 592 mtx_unlock(&sc->sc_mtx); 593 if (destroy) 594 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL); 595 } 596 597 /* 598 * g_dev_orphan() 599 * 600 * Called from below when the provider orphaned us. 601 * - Clear any dump settings. 602 * - Request asynchronous device destruction to prevent any more requests 603 * from coming in. The provider is already marked with an error, so 604 * anything which comes in in the interrim will be returned immediately. 605 */ 606 607 static void 608 g_dev_orphan(struct g_consumer *cp) 609 { 610 struct cdev *dev; 611 struct g_dev_softc *sc; 612 613 g_topology_assert(); 614 sc = cp->private; 615 dev = sc->sc_dev; 616 g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name); 617 618 /* Reset any dump-area set on this device */ 619 if (dev->si_flags & SI_DUMPDEV) 620 set_dumper(NULL); 621 622 /* Destroy the struct cdev *so we get no more requests */ 623 destroy_dev_sched_cb(dev, g_dev_callback, cp); 624 } 625 626 DECLARE_GEOM_CLASS(g_dev_class, g_dev);
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