sys/geom/geom_dev.c

   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_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         cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
 226         error = g_attach(cp, pp);
 227         KASSERT(error == 0,
 228             ("g_dev_taste(%s) failed to g_attach, err=%d", pp->name, error));
 229         error = make_dev_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &dev,
 230             &g_dev_cdevsw, NULL, UID_ROOT, GID_OPERATOR, 0640, "%s", gp->name);
 231         if (error != 0) {
 232                 printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n",
 233                     __func__, gp->name, error);
 234                 g_detach(cp);
 235                 g_destroy_consumer(cp);
 236                 g_destroy_geom(gp);
 237                 mtx_destroy(&sc->sc_mtx);
 238                 g_free(sc);
 239                 return (NULL);
 240         }
 241         dev->si_flags |= SI_UNMAPPED;
 242         sc->sc_dev = dev;
 243
 244         /* Search for device alias name and create it if found. */
 245         adev = NULL;
 246         for (len = MIN(strlen(gp->name), sizeof(buf) - 15); len > 0; len--) {
 247                 snprintf(buf, sizeof(buf), "kern.devalias.%s", gp->name);
 248                 buf[14 + len] = 0;
 249                 val = getenv(buf);
 250                 if (val != NULL) {
 251                         snprintf(buf, sizeof(buf), "%s%s",
 252                             val, gp->name + len);
 253                         freeenv(val);
 254                         if ((make_dev_alias_p(MAKEDEV_CHECKNAME|MAKEDEV_WAITOK,
 255                             &adev, dev, "%s", buf)) != 0)
 256                                 printf("Warning: unable to create device "
 257                                     "alias %s\n", buf);
 258                         break;
 259                 }
 260         }
 261
 262         dev->si_iosize_max = MAXPHYS;
 263         dev->si_drv2 = cp;
 264         if (adev != NULL) {
 265                 adev->si_iosize_max = MAXPHYS;
 266                 adev->si_drv2 = cp;
 267                 adev->si_flags |= SI_UNMAPPED;
 268         }
 269
 270         g_dev_attrchanged(cp, "GEOM::physpath");
 271
 272         return (gp);
 273 }
 274
 275 static int
 276 g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td)
 277 {
 278         struct g_consumer *cp;
 279         struct g_dev_softc *sc;
 280         int error, r, w, e;
 281
 282         cp = dev->si_drv2;
 283         if (cp == NULL)
 284                 return(ENXIO);          /* g_dev_taste() not done yet */
 285         g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)",
 286             cp->geom->name, flags, fmt, td);
 287
 288         r = flags & FREAD ? 1 : 0;
 289         w = flags & FWRITE ? 1 : 0;
 290 #ifdef notyet
 291         e = flags & O_EXCL ? 1 : 0;
 292 #else
 293         e = 0;
 294 #endif
 295         if (w) {
 296                 /*
 297                  * When running in very secure mode, do not allow
 298                  * opens for writing of any disks.
 299                  */
 300                 error = securelevel_ge(td->td_ucred, 2);
 301                 if (error)
 302                         return (error);
 303         }
 304         g_topology_lock();
 305         error = g_access(cp, r, w, e);
 306         g_topology_unlock();
 307         if (error == 0) {
 308                 sc = cp->private;
 309                 mtx_lock(&sc->sc_mtx);
 310                 if (sc->sc_open == 0 && sc->sc_active != 0)
 311                         wakeup(&sc->sc_active);
 312                 sc->sc_open += r + w + e;
 313                 mtx_unlock(&sc->sc_mtx);
 314         }
 315         return(error);
 316 }
 317
 318 static int
 319 g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td)
 320 {
 321         struct g_consumer *cp;
 322         struct g_dev_softc *sc;
 323         int error, r, w, e;
 324
 325         cp = dev->si_drv2;
 326         if (cp == NULL)
 327                 return(ENXIO);
 328         g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)",
 329             cp->geom->name, flags, fmt, td);
 330
 331         r = flags & FREAD ? -1 : 0;
 332         w = flags & FWRITE ? -1 : 0;
 333 #ifdef notyet
 334         e = flags & O_EXCL ? -1 : 0;
 335 #else
 336         e = 0;
 337 #endif
 338         sc = cp->private;
 339         mtx_lock(&sc->sc_mtx);
 340         sc->sc_open += r + w + e;
 341         while (sc->sc_open == 0 && sc->sc_active != 0)
 342                 msleep(&sc->sc_active, &sc->sc_mtx, 0, "PRIBIO", 0);
 343         mtx_unlock(&sc->sc_mtx);
 344         g_topology_lock();
 345         error = g_access(cp, r, w, e);
 346         g_topology_unlock();
 347         return (error);
 348 }
 349
 350 /*
 351  * XXX: Until we have unmessed the ioctl situation, there is a race against
 352  * XXX: a concurrent orphanization.  We cannot close it by holding topology
 353  * XXX: since that would prevent us from doing our job, and stalling events
 354  * XXX: will break (actually: stall) the BSD disklabel hacks.
 355  */
 356 static int
 357 g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
 358 {
 359         struct g_consumer *cp;
 360         struct g_provider *pp;
 361         struct g_kerneldump kd;
 362         off_t offset, length, chunk;
 363         int i, error;
 364         u_int u;
 365
 366         cp = dev->si_drv2;
 367         pp = cp->provider;
 368
 369         error = 0;
 370         KASSERT(cp->acr || cp->acw,
 371             ("Consumer with zero access count in g_dev_ioctl"));
 372
 373         i = IOCPARM_LEN(cmd);
 374         switch (cmd) {
 375         case DIOCGSECTORSIZE:
 376                 *(u_int *)data = cp->provider->sectorsize;
 377                 if (*(u_int *)data == 0)
 378                         error = ENOENT;
 379                 break;
 380         case DIOCGMEDIASIZE:
 381                 *(off_t *)data = cp->provider->mediasize;
 382                 if (*(off_t *)data == 0)
 383                         error = ENOENT;
 384                 break;
 385         case DIOCGFWSECTORS:
 386                 error = g_io_getattr("GEOM::fwsectors", cp, &i, data);
 387                 if (error == 0 && *(u_int *)data == 0)
 388                         error = ENOENT;
 389                 break;
 390         case DIOCGFWHEADS:
 391                 error = g_io_getattr("GEOM::fwheads", cp, &i, data);
 392                 if (error == 0 && *(u_int *)data == 0)
 393                         error = ENOENT;
 394                 break;
 395         case DIOCGFRONTSTUFF:
 396                 error = g_io_getattr("GEOM::frontstuff", cp, &i, data);
 397                 break;
 398         case DIOCSKERNELDUMP:
 399                 u = *((u_int *)data);
 400                 if (!u) {
 401                         set_dumper(NULL, NULL);
 402                         error = 0;
 403                         break;
 404                 }
 405                 kd.offset = 0;
 406                 kd.length = OFF_MAX;
 407                 i = sizeof kd;
 408                 error = g_io_getattr("GEOM::kerneldump", cp, &i, &kd);
 409                 if (!error) {
 410                         error = set_dumper(&kd.di, devtoname(dev));
 411                         if (!error)
 412                                 dev->si_flags |= SI_DUMPDEV;
 413                 }
 414                 break;
 415         case DIOCGFLUSH:
 416                 error = g_io_flush(cp);
 417                 break;
 418         case DIOCGDELETE:
 419                 offset = ((off_t *)data)[0];
 420                 length = ((off_t *)data)[1];
 421                 if ((offset % cp->provider->sectorsize) != 0 ||
 422                     (length % cp->provider->sectorsize) != 0 || length <= 0) {
 423                         printf("%s: offset=%jd length=%jd\n", __func__, offset,
 424                             length);
 425                         error = EINVAL;
 426                         break;
 427                 }
 428                 while (length > 0) {
 429                         chunk = length;
 430                         if (g_dev_del_max_sectors != 0 && chunk >
 431                             g_dev_del_max_sectors * cp->provider->sectorsize) {
 432                                 chunk = g_dev_del_max_sectors *
 433                                     cp->provider->sectorsize;
 434                         }
 435                         error = g_delete_data(cp, offset, chunk);
 436                         length -= chunk;
 437                         offset += chunk;
 438                         if (error)
 439                                 break;
 440                         /*
 441                          * Since the request size can be large, the service
 442                          * time can be is likewise.  We make this ioctl
 443                          * interruptible by checking for signals for each bio.
 444                          */
 445                         if (SIGPENDING(td))
 446                                 break;
 447                 }
 448                 break;
 449         case DIOCGIDENT:
 450                 error = g_io_getattr("GEOM::ident", cp, &i, data);
 451                 break;
 452         case DIOCGPROVIDERNAME:
 453                 if (pp == NULL)
 454                         return (ENOENT);
 455                 strlcpy(data, pp->name, i);
 456                 break;
 457         case DIOCGSTRIPESIZE:
 458                 *(off_t *)data = cp->provider->stripesize;
 459                 break;
 460         case DIOCGSTRIPEOFFSET:
 461                 *(off_t *)data = cp->provider->stripeoffset;
 462                 break;
 463         case DIOCGPHYSPATH:
 464                 error = g_io_getattr("GEOM::physpath", cp, &i, data);
 465                 if (error == 0 && *(char *)data == '\0')
 466                         error = ENOENT;
 467                 break;
 468         default:
 469                 if (cp->provider->geom->ioctl != NULL) {
 470                         error = cp->provider->geom->ioctl(cp->provider, cmd, data, fflag, td);
 471                 } else {
 472                         error = ENOIOCTL;
 473                 }
 474         }
 475
 476         return (error);
 477 }
 478
 479 static void
 480 g_dev_done(struct bio *bp2)
 481 {
 482         struct g_consumer *cp;
 483         struct g_dev_softc *sc;
 484         struct bio *bp;
 485         int destroy;
 486
 487         cp = bp2->bio_from;
 488         sc = cp->private;
 489         bp = bp2->bio_parent;
 490         bp->bio_error = bp2->bio_error;
 491         bp->bio_completed = bp2->bio_completed;
 492         bp->bio_resid = bp->bio_length - bp2->bio_completed;
 493         if (bp2->bio_error != 0) {
 494                 g_trace(G_T_BIO, "g_dev_done(%p) had error %d",
 495                     bp2, bp2->bio_error);
 496                 bp->bio_flags |= BIO_ERROR;
 497         } else {
 498                 g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd",
 499                     bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed);
 500         }
 501         g_destroy_bio(bp2);
 502         destroy = 0;
 503         mtx_lock(&sc->sc_mtx);
 504         if ((--sc->sc_active) == 0) {
 505                 if (sc->sc_open == 0)
 506                         wakeup(&sc->sc_active);
 507                 if (sc->sc_dev == NULL)
 508                         destroy = 1;
 509         }
 510         mtx_unlock(&sc->sc_mtx);
 511         if (destroy)
 512                 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL);
 513         biodone(bp);
 514 }
 515
 516 static void
 517 g_dev_strategy(struct bio *bp)
 518 {
 519         struct g_consumer *cp;
 520         struct bio *bp2;
 521         struct cdev *dev;
 522         struct g_dev_softc *sc;
 523
 524         KASSERT(bp->bio_cmd == BIO_READ ||
 525                 bp->bio_cmd == BIO_WRITE ||
 526                 bp->bio_cmd == BIO_DELETE ||
 527                 bp->bio_cmd == BIO_FLUSH,
 528                 ("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd));
 529         dev = bp->bio_dev;
 530         cp = dev->si_drv2;
 531         sc = cp->private;
 532         KASSERT(cp->acr || cp->acw,
 533             ("Consumer with zero access count in g_dev_strategy"));
 534 #ifdef INVARIANTS
 535         if ((bp->bio_offset % cp->provider->sectorsize) != 0 ||
 536             (bp->bio_bcount % cp->provider->sectorsize) != 0) {
 537                 bp->bio_resid = bp->bio_bcount;
 538                 biofinish(bp, NULL, EINVAL);
 539                 return;
 540         }
 541 #endif
 542         mtx_lock(&sc->sc_mtx);
 543         KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy"));
 544         sc->sc_active++;
 545         mtx_unlock(&sc->sc_mtx);
 546
 547         for (;;) {
 548                 /*
 549                  * XXX: This is not an ideal solution, but I belive it to
 550                  * XXX: deadlock safe, all things considered.
 551                  */
 552                 bp2 = g_clone_bio(bp);
 553                 if (bp2 != NULL)
 554                         break;
 555                 pause("gdstrat", hz / 10);
 556         }
 557         KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place"));
 558         bp2->bio_done = g_dev_done;
 559         g_trace(G_T_BIO,
 560             "g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d",
 561             bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length,
 562             bp2->bio_data, bp2->bio_cmd);
 563         g_io_request(bp2, cp);
 564         KASSERT(cp->acr || cp->acw,
 565             ("g_dev_strategy raced with g_dev_close and lost"));
 566
 567 }
 568
 569 /*
 570  * g_dev_callback()
 571  *
 572  * Called by devfs when asynchronous device destruction is completed.
 573  * - Mark that we have no attached device any more.
 574  * - If there are no outstanding requests, schedule geom destruction.
 575  *   Otherwise destruction will be scheduled later by g_dev_done().
 576  */
 577
 578 static void
 579 g_dev_callback(void *arg)
 580 {
 581         struct g_consumer *cp;
 582         struct g_dev_softc *sc;
 583         int destroy;
 584
 585         cp = arg;
 586         sc = cp->private;
 587         g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name);
 588
 589         mtx_lock(&sc->sc_mtx);
 590         sc->sc_dev = NULL;
 591         sc->sc_alias = NULL;
 592         destroy = (sc->sc_active == 0);
 593         mtx_unlock(&sc->sc_mtx);
 594         if (destroy)
 595                 g_post_event(g_dev_destroy, cp, M_WAITOK, NULL);
 596 }
 597
 598 /*
 599  * g_dev_orphan()
 600  *
 601  * Called from below when the provider orphaned us.
 602  * - Clear any dump settings.
 603  * - Request asynchronous device destruction to prevent any more requests
 604  *   from coming in.  The provider is already marked with an error, so
 605  *   anything which comes in in the interrim will be returned immediately.
 606  */
 607
 608 static void
 609 g_dev_orphan(struct g_consumer *cp)
 610 {
 611         struct cdev *dev;
 612         struct g_dev_softc *sc;
 613
 614         g_topology_assert();
 615         sc = cp->private;
 616         dev = sc->sc_dev;
 617         g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name);
 618
 619         /* Reset any dump-area set on this device */
 620         if (dev->si_flags & SI_DUMPDEV)
 621                 set_dumper(NULL, NULL);
 622
 623         /* Destroy the struct cdev *so we get no more requests */
 624         destroy_dev_sched_cb(dev, g_dev_callback, cp);
 625 }
 626
 627 DECLARE_GEOM_CLASS(g_dev_class, g_dev);