sys/geom/geom_disk.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 "opt_geom.h"
  40
  41 #include <sys/param.h>
  42 #include <sys/systm.h>
  43 #include <sys/kernel.h>
  44 #include <sys/sysctl.h>
  45 #include <sys/bio.h>
  46 #include <sys/ctype.h>
  47 #include <sys/fcntl.h>
  48 #include <sys/malloc.h>
  49 #include <sys/sbuf.h>
  50 #include <sys/sysctl.h>
  51 #include <sys/devicestat.h>
  52 #include <machine/md_var.h>
  53
  54 #include <sys/lock.h>
  55 #include <sys/mutex.h>
  56 #include <geom/geom.h>
  57 #include <geom/geom_disk.h>
  58 #include <geom/geom_int.h>
  59
  60 #include <dev/led/led.h>
  61
  62 struct g_disk_softc {
  63         struct disk             *dp;
  64         struct sysctl_ctx_list  sysctl_ctx;
  65         struct sysctl_oid       *sysctl_tree;
  66         char                    led[64];
  67         uint32_t                state;
  68 };
  69
  70 static struct mtx g_disk_done_mtx;
  71
  72 static g_access_t g_disk_access;
  73 static g_init_t g_disk_init;
  74 static g_fini_t g_disk_fini;
  75 static g_start_t g_disk_start;
  76 static g_ioctl_t g_disk_ioctl;
  77 static g_dumpconf_t g_disk_dumpconf;
  78 static g_provgone_t g_disk_providergone;
  79
  80 static struct g_class g_disk_class = {
  81         .name = "DISK",
  82         .version = G_VERSION,
  83         .init = g_disk_init,
  84         .fini = g_disk_fini,
  85         .start = g_disk_start,
  86         .access = g_disk_access,
  87         .ioctl = g_disk_ioctl,
  88         .providergone = g_disk_providergone,
  89         .dumpconf = g_disk_dumpconf,
  90 };
  91
  92 SYSCTL_DECL(_kern_geom);
  93 static SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0,
  94     "GEOM_DISK stuff");
  95
  96 static void
  97 g_disk_init(struct g_class *mp __unused)
  98 {
  99
 100         mtx_init(&g_disk_done_mtx, "g_disk_done", NULL, MTX_DEF);
 101 }
 102
 103 static void
 104 g_disk_fini(struct g_class *mp __unused)
 105 {
 106
 107         mtx_destroy(&g_disk_done_mtx);
 108 }
 109
 110 DECLARE_GEOM_CLASS(g_disk_class, g_disk);
 111
 112 static void __inline
 113 g_disk_lock_giant(struct disk *dp)
 114 {
 115
 116         if (dp->d_flags & DISKFLAG_NEEDSGIANT)
 117                 mtx_lock(&Giant);
 118 }
 119
 120 static void __inline
 121 g_disk_unlock_giant(struct disk *dp)
 122 {
 123
 124         if (dp->d_flags & DISKFLAG_NEEDSGIANT)
 125                 mtx_unlock(&Giant);
 126 }
 127
 128 static int
 129 g_disk_access(struct g_provider *pp, int r, int w, int e)
 130 {
 131         struct disk *dp;
 132         struct g_disk_softc *sc;
 133         int error;
 134
 135         g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
 136             pp->name, r, w, e);
 137         g_topology_assert();
 138         sc = pp->geom->softc;
 139         if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
 140                 /*
 141                  * Allow decreasing access count even if disk is not
 142                  * avaliable anymore.
 143                  */
 144                 if (r <= 0 && w <= 0 && e <= 0)
 145                         return (0);
 146                 return (ENXIO);
 147         }
 148         r += pp->acr;
 149         w += pp->acw;
 150         e += pp->ace;
 151         error = 0;
 152         if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
 153                 if (dp->d_open != NULL) {
 154                         g_disk_lock_giant(dp);
 155                         error = dp->d_open(dp);
 156                         if (bootverbose && error != 0)
 157                                 printf("Opened disk %s -> %d\n",
 158                                     pp->name, error);
 159                         g_disk_unlock_giant(dp);
 160                 }
 161                 pp->mediasize = dp->d_mediasize;
 162                 pp->sectorsize = dp->d_sectorsize;
 163                 if (dp->d_flags & DISKFLAG_CANDELETE)
 164                         pp->flags |= G_PF_CANDELETE;
 165                 else
 166                         pp->flags &= ~G_PF_CANDELETE;
 167                 pp->stripeoffset = dp->d_stripeoffset;
 168                 pp->stripesize = dp->d_stripesize;
 169                 dp->d_flags |= DISKFLAG_OPEN;
 170                 if (dp->d_maxsize == 0) {
 171                         printf("WARNING: Disk drive %s%d has no d_maxsize\n",
 172                             dp->d_name, dp->d_unit);
 173                         dp->d_maxsize = DFLTPHYS;
 174                 }
 175         } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
 176                 if (dp->d_close != NULL) {
 177                         g_disk_lock_giant(dp);
 178                         error = dp->d_close(dp);
 179                         if (error != 0)
 180                                 printf("Closed disk %s -> %d\n",
 181                                     pp->name, error);
 182                         g_disk_unlock_giant(dp);
 183                 }
 184                 sc->state = G_STATE_ACTIVE;
 185                 if (sc->led[0] != 0)
 186                         led_set(sc->led, "0");
 187                 dp->d_flags &= ~DISKFLAG_OPEN;
 188         }
 189         return (error);
 190 }
 191
 192 static void
 193 g_disk_kerneldump(struct bio *bp, struct disk *dp)
 194 {
 195         struct g_kerneldump *gkd;
 196         struct g_geom *gp;
 197
 198         gkd = (struct g_kerneldump*)bp->bio_data;
 199         gp = bp->bio_to->geom;
 200         g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)",
 201                 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
 202         if (dp->d_dump == NULL) {
 203                 g_io_deliver(bp, ENODEV);
 204                 return;
 205         }
 206         gkd->di.dumper = dp->d_dump;
 207         gkd->di.priv = dp;
 208         gkd->di.blocksize = dp->d_sectorsize;
 209         gkd->di.maxiosize = dp->d_maxsize;
 210         gkd->di.mediaoffset = gkd->offset;
 211         if ((gkd->offset + gkd->length) > dp->d_mediasize)
 212                 gkd->length = dp->d_mediasize - gkd->offset;
 213         gkd->di.mediasize = gkd->length;
 214         g_io_deliver(bp, 0);
 215 }
 216
 217 static void
 218 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc)
 219 {
 220         const char *cmd;
 221
 222         memcpy(&sc->state, bp->bio_data, sizeof(sc->state));
 223         if (sc->led[0] != 0) {
 224                 switch (sc->state) {
 225                 case G_STATE_FAILED:
 226                         cmd = "1";
 227                         break;
 228                 case G_STATE_REBUILD:
 229                         cmd = "f5";
 230                         break;
 231                 case G_STATE_RESYNC:
 232                         cmd = "f1";
 233                         break;
 234                 default:
 235                         cmd = "0";
 236                         break;
 237                 }
 238                 led_set(sc->led, cmd);
 239         }
 240         g_io_deliver(bp, 0);
 241 }
 242
 243 static void
 244 g_disk_done(struct bio *bp)
 245 {
 246         struct bio *bp2;
 247         struct disk *dp;
 248         struct g_disk_softc *sc;
 249
 250         /* See "notes" for why we need a mutex here */
 251         /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */
 252         mtx_lock(&g_disk_done_mtx);
 253         bp->bio_completed = bp->bio_length - bp->bio_resid;
 254
 255         bp2 = bp->bio_parent;
 256         if (bp2->bio_error == 0)
 257                 bp2->bio_error = bp->bio_error;
 258         bp2->bio_completed += bp->bio_completed;
 259         if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) != 0 &&
 260             (sc = bp2->bio_to->geom->softc) != NULL &&
 261             (dp = sc->dp) != NULL) {
 262                 devstat_end_transaction_bio(dp->d_devstat, bp);
 263         }
 264         g_destroy_bio(bp);
 265         bp2->bio_inbed++;
 266         if (bp2->bio_children == bp2->bio_inbed) {
 267                 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
 268                 g_io_deliver(bp2, bp2->bio_error);
 269         }
 270         mtx_unlock(&g_disk_done_mtx);
 271 }
 272
 273 static int
 274 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
 275 {
 276         struct g_geom *gp;
 277         struct disk *dp;
 278         struct g_disk_softc *sc;
 279         int error;
 280
 281         gp = pp->geom;
 282         sc = gp->softc;
 283         dp = sc->dp;
 284
 285         if (dp->d_ioctl == NULL)
 286                 return (ENOIOCTL);
 287         g_disk_lock_giant(dp);
 288         error = dp->d_ioctl(dp, cmd, data, fflag, td);
 289         g_disk_unlock_giant(dp);
 290         return (error);
 291 }
 292
 293 static void
 294 g_disk_start(struct bio *bp)
 295 {
 296         struct bio *bp2, *bp3;
 297         struct disk *dp;
 298         struct g_disk_softc *sc;
 299         int error;
 300         off_t off;
 301
 302         sc = bp->bio_to->geom->softc;
 303         if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
 304                 g_io_deliver(bp, ENXIO);
 305                 return;
 306         }
 307         error = EJUSTRETURN;
 308         switch(bp->bio_cmd) {
 309         case BIO_DELETE:
 310                 if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
 311                         error = EOPNOTSUPP;
 312                         break;
 313                 }
 314                 /* fall-through */
 315         case BIO_READ:
 316         case BIO_WRITE:
 317                 off = 0;
 318                 bp3 = NULL;
 319                 bp2 = g_clone_bio(bp);
 320                 if (bp2 == NULL) {
 321                         error = ENOMEM;
 322                         break;
 323                 }
 324                 do {
 325                         bp2->bio_offset += off;
 326                         bp2->bio_length -= off;
 327                         bp2->bio_data += off;
 328                         if (bp2->bio_length > dp->d_maxsize) {
 329                                 /*
 330                                  * XXX: If we have a stripesize we should really
 331                                  * use it here.
 332                                  */
 333                                 bp2->bio_length = dp->d_maxsize;
 334                                 off += dp->d_maxsize;
 335                                 /*
 336                                  * To avoid a race, we need to grab the next bio
 337                                  * before we schedule this one.  See "notes".
 338                                  */
 339                                 bp3 = g_clone_bio(bp);
 340                                 if (bp3 == NULL)
 341                                         bp->bio_error = ENOMEM;
 342                         }
 343                         bp2->bio_done = g_disk_done;
 344                         bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
 345                         bp2->bio_bcount = bp2->bio_length;
 346                         bp2->bio_disk = dp;
 347                         devstat_start_transaction_bio(dp->d_devstat, bp2);
 348                         g_disk_lock_giant(dp);
 349                         dp->d_strategy(bp2);
 350                         g_disk_unlock_giant(dp);
 351                         bp2 = bp3;
 352                         bp3 = NULL;
 353                 } while (bp2 != NULL);
 354                 break;
 355         case BIO_GETATTR:
 356                 /* Give the driver a chance to override */
 357                 if (dp->d_getattr != NULL) {
 358                         if (bp->bio_disk == NULL)
 359                                 bp->bio_disk = dp;
 360                         error = dp->d_getattr(bp);
 361                         if (error != -1)
 362                                 break;
 363                         error = EJUSTRETURN;
 364                 }
 365                 if (g_handleattr_int(bp, "GEOM::candelete",
 366                     (dp->d_flags & DISKFLAG_CANDELETE) != 0))
 367                         break;
 368                 else if (g_handleattr_int(bp, "GEOM::fwsectors",
 369                     dp->d_fwsectors))
 370                         break;
 371                 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
 372                         break;
 373                 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
 374                         break;
 375                 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident))
 376                         break;
 377                 else if (g_handleattr(bp, "GEOM::hba_vendor",
 378                     &dp->d_hba_vendor, 2))
 379                         break;
 380                 else if (g_handleattr(bp, "GEOM::hba_device",
 381                     &dp->d_hba_device, 2))
 382                         break;
 383                 else if (g_handleattr(bp, "GEOM::hba_subvendor",
 384                     &dp->d_hba_subvendor, 2))
 385                         break;
 386                 else if (g_handleattr(bp, "GEOM::hba_subdevice",
 387                     &dp->d_hba_subdevice, 2))
 388                         break;
 389                 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
 390                         g_disk_kerneldump(bp, dp);
 391                 else if (!strcmp(bp->bio_attribute, "GEOM::setstate"))
 392                         g_disk_setstate(bp, sc);
 393                 else
 394                         error = ENOIOCTL;
 395                 break;
 396         case BIO_FLUSH:
 397                 g_trace(G_T_TOPOLOGY, "g_disk_flushcache(%s)",
 398                     bp->bio_to->name);
 399                 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) {
 400                         error = EOPNOTSUPP;
 401                         break;
 402                 }
 403                 bp2 = g_clone_bio(bp);
 404                 if (bp2 == NULL) {
 405                         g_io_deliver(bp, ENOMEM);
 406                         return;
 407                 }
 408                 bp2->bio_done = g_disk_done;
 409                 bp2->bio_disk = dp;
 410                 g_disk_lock_giant(dp);
 411                 dp->d_strategy(bp2);
 412                 g_disk_unlock_giant(dp);
 413                 break;
 414         default:
 415                 error = EOPNOTSUPP;
 416                 break;
 417         }
 418         if (error != EJUSTRETURN)
 419                 g_io_deliver(bp, error);
 420         return;
 421 }
 422
 423 static void
 424 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
 425 {
 426         struct disk *dp;
 427         struct g_disk_softc *sc;
 428
 429         sc = gp->softc;
 430         if (sc == NULL || (dp = sc->dp) == NULL)
 431                 return;
 432         if (indent == NULL) {
 433                 sbuf_printf(sb, " hd %u", dp->d_fwheads);
 434                 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
 435                 return;
 436         }
 437         if (pp != NULL) {
 438                 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
 439                     indent, dp->d_fwheads);
 440                 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
 441                     indent, dp->d_fwsectors);
 442                 sbuf_printf(sb, "%s<ident>%s</ident>\n", indent, dp->d_ident);
 443                 sbuf_printf(sb, "%s<descr>%s</descr>\n", indent, dp->d_descr);
 444         }
 445 }
 446
 447 static void
 448 g_disk_create(void *arg, int flag)
 449 {
 450         struct g_geom *gp;
 451         struct g_provider *pp;
 452         struct disk *dp;
 453         struct g_disk_softc *sc;
 454         char tmpstr[80];
 455
 456         if (flag == EV_CANCEL)
 457                 return;
 458         g_topology_assert();
 459         dp = arg;
 460         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
 461         sc->dp = dp;
 462         gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
 463         gp->softc = sc;
 464         pp = g_new_providerf(gp, "%s", gp->name);
 465         pp->mediasize = dp->d_mediasize;
 466         pp->sectorsize = dp->d_sectorsize;
 467         if (dp->d_flags & DISKFLAG_CANDELETE)
 468                 pp->flags |= G_PF_CANDELETE;
 469         pp->stripeoffset = dp->d_stripeoffset;
 470         pp->stripesize = dp->d_stripesize;
 471         if (bootverbose)
 472                 printf("GEOM: new disk %s\n", gp->name);
 473         sysctl_ctx_init(&sc->sysctl_ctx);
 474         snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name);
 475         sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
 476                 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name,
 477                 CTLFLAG_RD, 0, tmpstr);
 478         if (sc->sysctl_tree != NULL) {
 479                 snprintf(tmpstr, sizeof(tmpstr),
 480                     "kern.geom.disk.%s.led", gp->name);
 481                 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led));
 482                 SYSCTL_ADD_STRING(&sc->sysctl_ctx,
 483                     SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led",
 484                     CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led),
 485                     "LED name");
 486         }
 487         pp->private = sc;
 488         dp->d_geom = gp;
 489         g_error_provider(pp, 0);
 490 }
 491
 492 /*
 493  * We get this callback after all of the consumers have gone away, and just
 494  * before the provider is freed.  If the disk driver provided a d_gone
 495  * callback, let them know that it is okay to free resources -- they won't
 496  * be getting any more accesses from GEOM.
 497  */
 498 static void
 499 g_disk_providergone(struct g_provider *pp)
 500 {
 501         struct disk *dp;
 502         struct g_disk_softc *sc;
 503
 504         sc = (struct g_disk_softc *)pp->geom->softc;
 505
 506         /*
 507          * If the softc is already NULL, then we've probably been through
 508          * g_disk_destroy already; there is nothing for us to do anyway.
 509          */
 510         if (sc == NULL)
 511                 return;
 512
 513         dp = sc->dp;
 514
 515         if (dp->d_gone != NULL)
 516                 dp->d_gone(dp);
 517 }
 518
 519 static void
 520 g_disk_destroy(void *ptr, int flag)
 521 {
 522         struct disk *dp;
 523         struct g_geom *gp;
 524         struct g_disk_softc *sc;
 525
 526         g_topology_assert();
 527         dp = ptr;
 528         gp = dp->d_geom;
 529         if (gp != NULL) {
 530                 sc = gp->softc;
 531                 if (sc->sysctl_tree != NULL) {
 532                         sysctl_ctx_free(&sc->sysctl_ctx);
 533                         sc->sysctl_tree = NULL;
 534                 }
 535                 if (sc->led[0] != 0) {
 536                         led_set(sc->led, "0");
 537                         sc->led[0] = 0;
 538                 }
 539                 g_free(sc);
 540                 gp->softc = NULL;
 541                 g_wither_geom(gp, ENXIO);
 542         }
 543         g_free(dp);
 544 }
 545
 546 /*
 547  * We only allow printable characters in disk ident,
 548  * the rest is converted to 'x<HH>'.
 549  */
 550 static void
 551 g_disk_ident_adjust(char *ident, size_t size)
 552 {
 553         char *p, tmp[4], newid[DISK_IDENT_SIZE];
 554
 555         newid[0] = '\0';
 556         for (p = ident; *p != '\0'; p++) {
 557                 if (isprint(*p)) {
 558                         tmp[0] = *p;
 559                         tmp[1] = '\0';
 560                 } else {
 561                         snprintf(tmp, sizeof(tmp), "x%02hhx",
 562                             *(unsigned char *)p);
 563                 }
 564                 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid))
 565                         break;
 566         }
 567         bzero(ident, size);
 568         strlcpy(ident, newid, size);
 569 }
 570
 571 struct disk *
 572 disk_alloc(void)
 573 {
 574
 575         return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO));
 576 }
 577
 578 void
 579 disk_create(struct disk *dp, int version)
 580 {
 581
 582         if (version != DISK_VERSION_02) {
 583                 printf("WARNING: Attempt to add disk %s%d %s",
 584                     dp->d_name, dp->d_unit,
 585                     " using incompatible ABI version of disk(9)\n");
 586                 printf("WARNING: Ignoring disk %s%d\n",
 587                     dp->d_name, dp->d_unit);
 588                 return;
 589         }
 590         KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
 591         KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
 592         KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
 593         KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
 594         if (dp->d_devstat == NULL)
 595                 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
 596                     dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
 597                     DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
 598         dp->d_geom = NULL;
 599         g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident));
 600         g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
 601 }
 602
 603 void
 604 disk_destroy(struct disk *dp)
 605 {
 606
 607         g_cancel_event(dp);
 608         dp->d_destroyed = 1;
 609         if (dp->d_devstat != NULL)
 610                 devstat_remove_entry(dp->d_devstat);
 611         g_post_event(g_disk_destroy, dp, M_WAITOK, NULL);
 612 }
 613
 614 void
 615 disk_gone(struct disk *dp)
 616 {
 617         struct g_geom *gp;
 618         struct g_provider *pp;
 619
 620         gp = dp->d_geom;
 621         if (gp != NULL)
 622                 LIST_FOREACH(pp, &gp->provider, provider)
 623                         g_wither_provider(pp, ENXIO);
 624 }
 625
 626 void
 627 disk_attr_changed(struct disk *dp, const char *attr, int flag)
 628 {
 629         struct g_geom *gp;
 630         struct g_provider *pp;
 631
 632         gp = dp->d_geom;
 633         if (gp != NULL)
 634                 LIST_FOREACH(pp, &gp->provider, provider)
 635                         (void)g_attr_changed(pp, attr, flag);
 636 }
 637
 638 static void
 639 g_kern_disks(void *p, int flag __unused)
 640 {
 641         struct sbuf *sb;
 642         struct g_geom *gp;
 643         char *sp;
 644
 645         sb = p;
 646         sp = "";
 647         g_topology_assert();
 648         LIST_FOREACH(gp, &g_disk_class.geom, geom) {
 649                 sbuf_printf(sb, "%s%s", sp, gp->name);
 650                 sp = " ";
 651         }
 652         sbuf_finish(sb);
 653 }
 654
 655 static int
 656 sysctl_disks(SYSCTL_HANDLER_ARGS)
 657 {
 658         int error;
 659         struct sbuf *sb;
 660
 661         sb = sbuf_new_auto();
 662         g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
 663         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
 664         sbuf_delete(sb);
 665         return error;
 666 }
 667
 668 SYSCTL_PROC(_kern, OID_AUTO, disks,
 669     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 670     sysctl_disks, "A", "names of available disks");