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 mtx               done_mtx;
  64         struct disk             *dp;
  65         struct sysctl_ctx_list  sysctl_ctx;
  66         struct sysctl_oid       *sysctl_tree;
  67         char                    led[64];
  68         uint32_t                state;
  69 };
  70
  71 static g_access_t g_disk_access;
  72 static g_start_t g_disk_start;
  73 static g_ioctl_t g_disk_ioctl;
  74 static g_dumpconf_t g_disk_dumpconf;
  75 static g_provgone_t g_disk_providergone;
  76
  77 static struct g_class g_disk_class = {
  78         .name = "DISK",
  79         .version = G_VERSION,
  80         .start = g_disk_start,
  81         .access = g_disk_access,
  82         .ioctl = g_disk_ioctl,
  83         .providergone = g_disk_providergone,
  84         .dumpconf = g_disk_dumpconf,
  85 };
  86
  87 SYSCTL_DECL(_kern_geom);
  88 static SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0,
  89     "GEOM_DISK stuff");
  90
  91 DECLARE_GEOM_CLASS(g_disk_class, g_disk);
  92
  93 static void __inline
  94 g_disk_lock_giant(struct disk *dp)
  95 {
  96
  97         if (dp->d_flags & DISKFLAG_NEEDSGIANT)
  98                 mtx_lock(&Giant);
  99 }
 100
 101 static void __inline
 102 g_disk_unlock_giant(struct disk *dp)
 103 {
 104
 105         if (dp->d_flags & DISKFLAG_NEEDSGIANT)
 106                 mtx_unlock(&Giant);
 107 }
 108
 109 static int
 110 g_disk_access(struct g_provider *pp, int r, int w, int e)
 111 {
 112         struct disk *dp;
 113         struct g_disk_softc *sc;
 114         int error;
 115
 116         g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
 117             pp->name, r, w, e);
 118         g_topology_assert();
 119         sc = pp->private;
 120         if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
 121                 /*
 122                  * Allow decreasing access count even if disk is not
 123                  * avaliable anymore.
 124                  */
 125                 if (r <= 0 && w <= 0 && e <= 0)
 126                         return (0);
 127                 return (ENXIO);
 128         }
 129         r += pp->acr;
 130         w += pp->acw;
 131         e += pp->ace;
 132         error = 0;
 133         if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
 134                 if (dp->d_open != NULL) {
 135                         g_disk_lock_giant(dp);
 136                         error = dp->d_open(dp);
 137                         if (bootverbose && error != 0)
 138                                 printf("Opened disk %s -> %d\n",
 139                                     pp->name, error);
 140                         g_disk_unlock_giant(dp);
 141                 }
 142                 pp->mediasize = dp->d_mediasize;
 143                 pp->sectorsize = dp->d_sectorsize;
 144                 pp->stripeoffset = dp->d_stripeoffset;
 145                 pp->stripesize = dp->d_stripesize;
 146                 dp->d_flags |= DISKFLAG_OPEN;
 147                 if (dp->d_maxsize == 0) {
 148                         printf("WARNING: Disk drive %s%d has no d_maxsize\n",
 149                             dp->d_name, dp->d_unit);
 150                         dp->d_maxsize = DFLTPHYS;
 151                 }
 152         } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
 153                 if (dp->d_close != NULL) {
 154                         g_disk_lock_giant(dp);
 155                         error = dp->d_close(dp);
 156                         if (error != 0)
 157                                 printf("Closed disk %s -> %d\n",
 158                                     pp->name, error);
 159                         g_disk_unlock_giant(dp);
 160                 }
 161                 sc->state = G_STATE_ACTIVE;
 162                 if (sc->led[0] != 0)
 163                         led_set(sc->led, "0");
 164                 dp->d_flags &= ~DISKFLAG_OPEN;
 165         }
 166         return (error);
 167 }
 168
 169 static void
 170 g_disk_kerneldump(struct bio *bp, struct disk *dp)
 171 {
 172         struct g_kerneldump *gkd;
 173         struct g_geom *gp;
 174
 175         gkd = (struct g_kerneldump*)bp->bio_data;
 176         gp = bp->bio_to->geom;
 177         g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)",
 178                 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
 179         if (dp->d_dump == NULL) {
 180                 g_io_deliver(bp, ENODEV);
 181                 return;
 182         }
 183         gkd->di.dumper = dp->d_dump;
 184         gkd->di.priv = dp;
 185         gkd->di.blocksize = dp->d_sectorsize;
 186         gkd->di.maxiosize = dp->d_maxsize;
 187         gkd->di.mediaoffset = gkd->offset;
 188         if ((gkd->offset + gkd->length) > dp->d_mediasize)
 189                 gkd->length = dp->d_mediasize - gkd->offset;
 190         gkd->di.mediasize = gkd->length;
 191         g_io_deliver(bp, 0);
 192 }
 193
 194 static void
 195 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc)
 196 {
 197         const char *cmd;
 198
 199         memcpy(&sc->state, bp->bio_data, sizeof(sc->state));
 200         if (sc->led[0] != 0) {
 201                 switch (sc->state) {
 202                 case G_STATE_FAILED:
 203                         cmd = "1";
 204                         break;
 205                 case G_STATE_REBUILD:
 206                         cmd = "f5";
 207                         break;
 208                 case G_STATE_RESYNC:
 209                         cmd = "f1";
 210                         break;
 211                 default:
 212                         cmd = "0";
 213                         break;
 214                 }
 215                 led_set(sc->led, cmd);
 216         }
 217         g_io_deliver(bp, 0);
 218 }
 219
 220 static void
 221 g_disk_done(struct bio *bp)
 222 {
 223         struct bio *bp2;
 224         struct g_disk_softc *sc;
 225
 226         /* See "notes" for why we need a mutex here */
 227         /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */
 228         bp2 = bp->bio_parent;
 229         sc = bp2->bio_to->private;
 230         bp->bio_completed = bp->bio_length - bp->bio_resid;
 231         mtx_lock(&sc->done_mtx);
 232         if (bp2->bio_error == 0)
 233                 bp2->bio_error = bp->bio_error;
 234         bp2->bio_completed += bp->bio_completed;
 235         if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) != 0)
 236                 devstat_end_transaction_bio(sc->dp->d_devstat, bp);
 237         g_destroy_bio(bp);
 238         bp2->bio_inbed++;
 239         if (bp2->bio_children == bp2->bio_inbed) {
 240                 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
 241                 g_io_deliver(bp2, bp2->bio_error);
 242         }
 243         mtx_unlock(&sc->done_mtx);
 244 }
 245
 246 static int
 247 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
 248 {
 249         struct disk *dp;
 250         struct g_disk_softc *sc;
 251         int error;
 252
 253         sc = pp->private;
 254         dp = sc->dp;
 255
 256         if (dp->d_ioctl == NULL)
 257                 return (ENOIOCTL);
 258         g_disk_lock_giant(dp);
 259         error = dp->d_ioctl(dp, cmd, data, fflag, td);
 260         g_disk_unlock_giant(dp);
 261         return (error);
 262 }
 263
 264 static void
 265 g_disk_start(struct bio *bp)
 266 {
 267         struct bio *bp2, *bp3;
 268         struct disk *dp;
 269         struct g_disk_softc *sc;
 270         int error;
 271         off_t off;
 272
 273         sc = bp->bio_to->private;
 274         if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
 275                 g_io_deliver(bp, ENXIO);
 276                 return;
 277         }
 278         error = EJUSTRETURN;
 279         switch(bp->bio_cmd) {
 280         case BIO_DELETE:
 281                 if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
 282                         error = EOPNOTSUPP;
 283                         break;
 284                 }
 285                 /* fall-through */
 286         case BIO_READ:
 287         case BIO_WRITE:
 288                 off = 0;
 289                 bp3 = NULL;
 290                 bp2 = g_clone_bio(bp);
 291                 if (bp2 == NULL) {
 292                         error = ENOMEM;
 293                         break;
 294                 }
 295                 do {
 296                         bp2->bio_offset += off;
 297                         bp2->bio_length -= off;
 298                         if ((bp->bio_flags & BIO_UNMAPPED) == 0) {
 299                                 bp2->bio_data += off;
 300                         } else {
 301                                 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO)
 302                                     != 0,
 303                                     ("unmapped bio not supported by disk %s",
 304                                     dp->d_name));
 305                                 bp2->bio_ma += off / PAGE_SIZE;
 306                                 bp2->bio_ma_offset += off;
 307                                 bp2->bio_ma_offset %= PAGE_SIZE;
 308                                 bp2->bio_ma_n -= off / PAGE_SIZE;
 309                         }
 310                         if (bp2->bio_length > dp->d_maxsize) {
 311                                 /*
 312                                  * XXX: If we have a stripesize we should really
 313                                  * use it here.
 314                                  */
 315                                 bp2->bio_length = dp->d_maxsize;
 316                                 if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
 317                                         bp2->bio_ma_n = howmany(
 318                                             bp2->bio_ma_offset +
 319                                             bp2->bio_length, PAGE_SIZE);
 320                                 }
 321                                 off += dp->d_maxsize;
 322                                 /*
 323                                  * To avoid a race, we need to grab the next bio
 324                                  * before we schedule this one.  See "notes".
 325                                  */
 326                                 bp3 = g_clone_bio(bp);
 327                                 if (bp3 == NULL)
 328                                         bp->bio_error = ENOMEM;
 329                         }
 330                         bp2->bio_done = g_disk_done;
 331                         bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
 332                         bp2->bio_bcount = bp2->bio_length;
 333                         bp2->bio_disk = dp;
 334                         devstat_start_transaction_bio(dp->d_devstat, bp2);
 335                         g_disk_lock_giant(dp);
 336                         dp->d_strategy(bp2);
 337                         g_disk_unlock_giant(dp);
 338                         bp2 = bp3;
 339                         bp3 = NULL;
 340                 } while (bp2 != NULL);
 341                 break;
 342         case BIO_GETATTR:
 343                 /* Give the driver a chance to override */
 344                 if (dp->d_getattr != NULL) {
 345                         if (bp->bio_disk == NULL)
 346                                 bp->bio_disk = dp;
 347                         error = dp->d_getattr(bp);
 348                         if (error != -1)
 349                                 break;
 350                         error = EJUSTRETURN;
 351                 }
 352                 if (g_handleattr_int(bp, "GEOM::candelete",
 353                     (dp->d_flags & DISKFLAG_CANDELETE) != 0))
 354                         break;
 355                 else if (g_handleattr_int(bp, "GEOM::fwsectors",
 356                     dp->d_fwsectors))
 357                         break;
 358                 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
 359                         break;
 360                 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
 361                         break;
 362                 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident))
 363                         break;
 364                 else if (g_handleattr(bp, "GEOM::hba_vendor",
 365                     &dp->d_hba_vendor, 2))
 366                         break;
 367                 else if (g_handleattr(bp, "GEOM::hba_device",
 368                     &dp->d_hba_device, 2))
 369                         break;
 370                 else if (g_handleattr(bp, "GEOM::hba_subvendor",
 371                     &dp->d_hba_subvendor, 2))
 372                         break;
 373                 else if (g_handleattr(bp, "GEOM::hba_subdevice",
 374                     &dp->d_hba_subdevice, 2))
 375                         break;
 376                 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
 377                         g_disk_kerneldump(bp, dp);
 378                 else if (!strcmp(bp->bio_attribute, "GEOM::setstate"))
 379                         g_disk_setstate(bp, sc);
 380                 else
 381                         error = ENOIOCTL;
 382                 break;
 383         case BIO_FLUSH:
 384                 g_trace(G_T_BIO, "g_disk_flushcache(%s)",
 385                     bp->bio_to->name);
 386                 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) {
 387                         error = EOPNOTSUPP;
 388                         break;
 389                 }
 390                 bp2 = g_clone_bio(bp);
 391                 if (bp2 == NULL) {
 392                         g_io_deliver(bp, ENOMEM);
 393                         return;
 394                 }
 395                 bp2->bio_done = g_disk_done;
 396                 bp2->bio_disk = dp;
 397                 g_disk_lock_giant(dp);
 398                 dp->d_strategy(bp2);
 399                 g_disk_unlock_giant(dp);
 400                 break;
 401         default:
 402                 error = EOPNOTSUPP;
 403                 break;
 404         }
 405         if (error != EJUSTRETURN)
 406                 g_io_deliver(bp, error);
 407         return;
 408 }
 409
 410 static void
 411 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
 412 {
 413         struct disk *dp;
 414         struct g_disk_softc *sc;
 415
 416         sc = gp->softc;
 417         if (sc == NULL || (dp = sc->dp) == NULL)
 418                 return;
 419         if (indent == NULL) {
 420                 sbuf_printf(sb, " hd %u", dp->d_fwheads);
 421                 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
 422                 return;
 423         }
 424         if (pp != NULL) {
 425                 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
 426                     indent, dp->d_fwheads);
 427                 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
 428                     indent, dp->d_fwsectors);
 429                 sbuf_printf(sb, "%s<ident>%s</ident>\n", indent, dp->d_ident);
 430                 sbuf_printf(sb, "%s<descr>%s</descr>\n", indent, dp->d_descr);
 431         }
 432 }
 433
 434 static void
 435 g_disk_resize(void *ptr, int flag)
 436 {
 437         struct disk *dp;
 438         struct g_geom *gp;
 439         struct g_provider *pp;
 440
 441         if (flag == EV_CANCEL)
 442                 return;
 443         g_topology_assert();
 444
 445         dp = ptr;
 446         gp = dp->d_geom;
 447
 448         if (dp->d_destroyed || gp == NULL)
 449                 return;
 450
 451         LIST_FOREACH(pp, &gp->provider, provider) {
 452                 if (pp->sectorsize != 0 &&
 453                     pp->sectorsize != dp->d_sectorsize)
 454                         g_wither_provider(pp, ENXIO);
 455                 else
 456                         g_resize_provider(pp, dp->d_mediasize);
 457         }
 458 }
 459
 460 static void
 461 g_disk_create(void *arg, int flag)
 462 {
 463         struct g_geom *gp;
 464         struct g_provider *pp;
 465         struct disk *dp;
 466         struct g_disk_softc *sc;
 467         char tmpstr[80];
 468
 469         if (flag == EV_CANCEL)
 470                 return;
 471         g_topology_assert();
 472         dp = arg;
 473         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
 474         mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF);
 475         sc->dp = dp;
 476         gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
 477         gp->softc = sc;
 478         pp = g_new_providerf(gp, "%s", gp->name);
 479         pp->mediasize = dp->d_mediasize;
 480         pp->sectorsize = dp->d_sectorsize;
 481         pp->stripeoffset = dp->d_stripeoffset;
 482         pp->stripesize = dp->d_stripesize;
 483         if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0)
 484                 pp->flags |= G_PF_ACCEPT_UNMAPPED;
 485         if (bootverbose)
 486                 printf("GEOM: new disk %s\n", gp->name);
 487         sysctl_ctx_init(&sc->sysctl_ctx);
 488         snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name);
 489         sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
 490                 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name,
 491                 CTLFLAG_RD, 0, tmpstr);
 492         if (sc->sysctl_tree != NULL) {
 493                 snprintf(tmpstr, sizeof(tmpstr),
 494                     "kern.geom.disk.%s.led", gp->name);
 495                 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led));
 496                 SYSCTL_ADD_STRING(&sc->sysctl_ctx,
 497                     SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led",
 498                     CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led),
 499                     "LED name");
 500         }
 501         pp->private = sc;
 502         dp->d_geom = gp;
 503         g_error_provider(pp, 0);
 504 }
 505
 506 /*
 507  * We get this callback after all of the consumers have gone away, and just
 508  * before the provider is freed.  If the disk driver provided a d_gone
 509  * callback, let them know that it is okay to free resources -- they won't
 510  * be getting any more accesses from GEOM.
 511  */
 512 static void
 513 g_disk_providergone(struct g_provider *pp)
 514 {
 515         struct disk *dp;
 516         struct g_disk_softc *sc;
 517
 518         sc = (struct g_disk_softc *)pp->private;
 519         dp = sc->dp;
 520         if (dp != NULL && dp->d_gone != NULL)
 521                 dp->d_gone(dp);
 522         if (sc->sysctl_tree != NULL) {
 523                 sysctl_ctx_free(&sc->sysctl_ctx);
 524                 sc->sysctl_tree = NULL;
 525         }
 526         if (sc->led[0] != 0) {
 527                 led_set(sc->led, "0");
 528                 sc->led[0] = 0;
 529         }
 530         pp->private = NULL;
 531         pp->geom->softc = NULL;
 532         mtx_destroy(&sc->done_mtx);
 533         g_free(sc);
 534 }
 535
 536 static void
 537 g_disk_destroy(void *ptr, int flag)
 538 {
 539         struct disk *dp;
 540         struct g_geom *gp;
 541         struct g_disk_softc *sc;
 542
 543         g_topology_assert();
 544         dp = ptr;
 545         gp = dp->d_geom;
 546         if (gp != NULL) {
 547                 sc = gp->softc;
 548                 if (sc != NULL)
 549                         sc->dp = NULL;
 550                 dp->d_geom = NULL;
 551                 g_wither_geom(gp, ENXIO);
 552         }
 553         g_free(dp);
 554 }
 555
 556 /*
 557  * We only allow printable characters in disk ident,
 558  * the rest is converted to 'x<HH>'.
 559  */
 560 static void
 561 g_disk_ident_adjust(char *ident, size_t size)
 562 {
 563         char *p, tmp[4], newid[DISK_IDENT_SIZE];
 564
 565         newid[0] = '\0';
 566         for (p = ident; *p != '\0'; p++) {
 567                 if (isprint(*p)) {
 568                         tmp[0] = *p;
 569                         tmp[1] = '\0';
 570                 } else {
 571                         snprintf(tmp, sizeof(tmp), "x%02hhx",
 572                             *(unsigned char *)p);
 573                 }
 574                 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid))
 575                         break;
 576         }
 577         bzero(ident, size);
 578         strlcpy(ident, newid, size);
 579 }
 580
 581 struct disk *
 582 disk_alloc(void)
 583 {
 584
 585         return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO));
 586 }
 587
 588 void
 589 disk_create(struct disk *dp, int version)
 590 {
 591
 592         if (version != DISK_VERSION_02) {
 593                 printf("WARNING: Attempt to add disk %s%d %s",
 594                     dp->d_name, dp->d_unit,
 595                     " using incompatible ABI version of disk(9)\n");
 596                 printf("WARNING: Ignoring disk %s%d\n",
 597                     dp->d_name, dp->d_unit);
 598                 return;
 599         }
 600         KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
 601         KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
 602         KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
 603         KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
 604         if (dp->d_devstat == NULL)
 605                 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
 606                     dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
 607                     DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
 608         dp->d_geom = NULL;
 609         g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident));
 610         g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
 611 }
 612
 613 void
 614 disk_destroy(struct disk *dp)
 615 {
 616
 617         g_cancel_event(dp);
 618         dp->d_destroyed = 1;
 619         if (dp->d_devstat != NULL)
 620                 devstat_remove_entry(dp->d_devstat);
 621         g_post_event(g_disk_destroy, dp, M_WAITOK, NULL);
 622 }
 623
 624 void
 625 disk_gone(struct disk *dp)
 626 {
 627         struct g_geom *gp;
 628         struct g_provider *pp;
 629
 630         gp = dp->d_geom;
 631         if (gp != NULL) {
 632                 pp = LIST_FIRST(&gp->provider);
 633                 if (pp != NULL) {
 634                         KASSERT(LIST_NEXT(pp, provider) == NULL,
 635                             ("geom %p has more than one provider", gp));
 636                         g_wither_provider(pp, ENXIO);
 637                 }
 638         }
 639 }
 640
 641 void
 642 disk_attr_changed(struct disk *dp, const char *attr, int flag)
 643 {
 644         struct g_geom *gp;
 645         struct g_provider *pp;
 646
 647         gp = dp->d_geom;
 648         if (gp != NULL)
 649                 LIST_FOREACH(pp, &gp->provider, provider)
 650                         (void)g_attr_changed(pp, attr, flag);
 651 }
 652
 653 void
 654 disk_media_changed(struct disk *dp, int flag)
 655 {
 656         struct g_geom *gp;
 657         struct g_provider *pp;
 658
 659         gp = dp->d_geom;
 660         if (gp != NULL) {
 661                 pp = LIST_FIRST(&gp->provider);
 662                 if (pp != NULL) {
 663                         KASSERT(LIST_NEXT(pp, provider) == NULL,
 664                             ("geom %p has more than one provider", gp));
 665                         g_media_changed(pp, flag);
 666                 }
 667         }
 668 }
 669
 670 void
 671 disk_media_gone(struct disk *dp, int flag)
 672 {
 673         struct g_geom *gp;
 674         struct g_provider *pp;
 675
 676         gp = dp->d_geom;
 677         if (gp != NULL) {
 678                 pp = LIST_FIRST(&gp->provider);
 679                 if (pp != NULL) {
 680                         KASSERT(LIST_NEXT(pp, provider) == NULL,
 681                             ("geom %p has more than one provider", gp));
 682                         g_media_gone(pp, flag);
 683                 }
 684         }
 685 }
 686
 687 int
 688 disk_resize(struct disk *dp, int flag)
 689 {
 690
 691         if (dp->d_destroyed || dp->d_geom == NULL)
 692                 return (0);
 693
 694         return (g_post_event(g_disk_resize, dp, flag, NULL));
 695 }
 696
 697 static void
 698 g_kern_disks(void *p, int flag __unused)
 699 {
 700         struct sbuf *sb;
 701         struct g_geom *gp;
 702         char *sp;
 703
 704         sb = p;
 705         sp = "";
 706         g_topology_assert();
 707         LIST_FOREACH(gp, &g_disk_class.geom, geom) {
 708                 sbuf_printf(sb, "%s%s", sp, gp->name);
 709                 sp = " ";
 710         }
 711         sbuf_finish(sb);
 712 }
 713
 714 static int
 715 sysctl_disks(SYSCTL_HANDLER_ARGS)
 716 {
 717         int error;
 718         struct sbuf *sb;
 719
 720         sb = sbuf_new_auto();
 721         g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
 722         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
 723         sbuf_delete(sb);
 724         return error;
 725 }
 726
 727 SYSCTL_PROC(_kern, OID_AUTO, disks,
 728     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 729     sysctl_disks, "A", "names of available disks");