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
  79 static struct g_class g_disk_class = {
  80         .name = "DISK",
  81         .version = G_VERSION,
  82         .init = g_disk_init,
  83         .fini = g_disk_fini,
  84         .start = g_disk_start,
  85         .access = g_disk_access,
  86         .ioctl = g_disk_ioctl,
  87         .dumpconf = g_disk_dumpconf,
  88 };
  89
  90 SYSCTL_DECL(_kern_geom);
  91 SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0, "GEOM_DISK stuff");
  92
  93 static void
  94 g_disk_init(struct g_class *mp __unused)
  95 {
  96
  97         mtx_init(&g_disk_done_mtx, "g_disk_done", NULL, MTX_DEF);
  98 }
  99
 100 static void
 101 g_disk_fini(struct g_class *mp __unused)
 102 {
 103
 104         mtx_destroy(&g_disk_done_mtx);
 105 }
 106
 107 DECLARE_GEOM_CLASS(g_disk_class, g_disk);
 108
 109 static void __inline
 110 g_disk_lock_giant(struct disk *dp)
 111 {
 112
 113         if (dp->d_flags & DISKFLAG_NEEDSGIANT)
 114                 mtx_lock(&Giant);
 115 }
 116
 117 static void __inline
 118 g_disk_unlock_giant(struct disk *dp)
 119 {
 120
 121         if (dp->d_flags & DISKFLAG_NEEDSGIANT)
 122                 mtx_unlock(&Giant);
 123 }
 124
 125 static int
 126 g_disk_access(struct g_provider *pp, int r, int w, int e)
 127 {
 128         struct disk *dp;
 129         struct g_disk_softc *sc;
 130         int error;
 131
 132         g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
 133             pp->name, r, w, e);
 134         g_topology_assert();
 135         sc = pp->geom->softc;
 136         if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
 137                 /*
 138                  * Allow decreasing access count even if disk is not
 139                  * avaliable anymore.
 140                  */
 141                 if (r <= 0 && w <= 0 && e <= 0)
 142                         return (0);
 143                 return (ENXIO);
 144         }
 145         r += pp->acr;
 146         w += pp->acw;
 147         e += pp->ace;
 148         error = 0;
 149         if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
 150                 if (dp->d_open != NULL) {
 151                         g_disk_lock_giant(dp);
 152                         error = dp->d_open(dp);
 153                         if (bootverbose && error != 0)
 154                                 printf("Opened disk %s -> %d\n",
 155                                     pp->name, error);
 156                         g_disk_unlock_giant(dp);
 157                 }
 158                 pp->mediasize = dp->d_mediasize;
 159                 pp->sectorsize = dp->d_sectorsize;
 160                 if (dp->d_flags & DISKFLAG_CANDELETE)
 161                         pp->flags |= G_PF_CANDELETE;
 162                 else
 163                         pp->flags &= ~G_PF_CANDELETE;
 164                 pp->stripeoffset = dp->d_stripeoffset;
 165                 pp->stripesize = dp->d_stripesize;
 166                 dp->d_flags |= DISKFLAG_OPEN;
 167                 if (dp->d_maxsize == 0) {
 168                         printf("WARNING: Disk drive %s%d has no d_maxsize\n",
 169                             dp->d_name, dp->d_unit);
 170                         dp->d_maxsize = DFLTPHYS;
 171                 }
 172         } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
 173                 if (dp->d_close != NULL) {
 174                         g_disk_lock_giant(dp);
 175                         error = dp->d_close(dp);
 176                         if (error != 0)
 177                                 printf("Closed disk %s -> %d\n",
 178                                     pp->name, error);
 179                         g_disk_unlock_giant(dp);
 180                 }
 181                 sc->state = G_STATE_ACTIVE;
 182                 if (sc->led[0] != 0)
 183                         led_set(sc->led, "0");
 184                 dp->d_flags &= ~DISKFLAG_OPEN;
 185         }
 186         return (error);
 187 }
 188
 189 static void
 190 g_disk_kerneldump(struct bio *bp, struct disk *dp)
 191 {
 192         struct g_kerneldump *gkd;
 193         struct g_geom *gp;
 194
 195         gkd = (struct g_kerneldump*)bp->bio_data;
 196         gp = bp->bio_to->geom;
 197         g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)",
 198                 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
 199         if (dp->d_dump == NULL) {
 200                 g_io_deliver(bp, ENODEV);
 201                 return;
 202         }
 203         gkd->di.dumper = dp->d_dump;
 204         gkd->di.priv = dp;
 205         gkd->di.blocksize = dp->d_sectorsize;
 206         gkd->di.maxiosize = dp->d_maxsize;
 207         gkd->di.mediaoffset = gkd->offset;
 208         if ((gkd->offset + gkd->length) > dp->d_mediasize)
 209                 gkd->length = dp->d_mediasize - gkd->offset;
 210         gkd->di.mediasize = gkd->length;
 211         g_io_deliver(bp, 0);
 212 }
 213
 214 static void
 215 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc)
 216 {
 217         const char *cmd;
 218
 219         memcpy(&sc->state, bp->bio_data, sizeof(sc->state));
 220         if (sc->led[0] != 0) {
 221                 switch (sc->state) {
 222                 case G_STATE_FAILED:
 223                         cmd = "1";
 224                         break;
 225                 case G_STATE_REBUILD:
 226                         cmd = "f5";
 227                         break;
 228                 case G_STATE_RESYNC:
 229                         cmd = "f1";
 230                         break;
 231                 default:
 232                         cmd = "0";
 233                         break;
 234                 }
 235                 led_set(sc->led, cmd);
 236         }
 237         g_io_deliver(bp, 0);
 238 }
 239
 240 static void
 241 g_disk_done(struct bio *bp)
 242 {
 243         struct bio *bp2;
 244         struct disk *dp;
 245         struct g_disk_softc *sc;
 246
 247         /* See "notes" for why we need a mutex here */
 248         /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */
 249         mtx_lock(&g_disk_done_mtx);
 250         bp->bio_completed = bp->bio_length - bp->bio_resid;
 251
 252         bp2 = bp->bio_parent;
 253         if (bp2->bio_error == 0)
 254                 bp2->bio_error = bp->bio_error;
 255         bp2->bio_completed += bp->bio_completed;
 256         if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) != 0 &&
 257             (sc = bp2->bio_to->geom->softc) != NULL &&
 258             (dp = sc->dp) != NULL) {
 259                 devstat_end_transaction_bio(dp->d_devstat, bp);
 260         }
 261         g_destroy_bio(bp);
 262         bp2->bio_inbed++;
 263         if (bp2->bio_children == bp2->bio_inbed) {
 264                 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
 265                 g_io_deliver(bp2, bp2->bio_error);
 266         }
 267         mtx_unlock(&g_disk_done_mtx);
 268 }
 269
 270 static int
 271 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
 272 {
 273         struct g_geom *gp;
 274         struct disk *dp;
 275         struct g_disk_softc *sc;
 276         int error;
 277
 278         gp = pp->geom;
 279         sc = gp->softc;
 280         dp = sc->dp;
 281
 282         if (dp->d_ioctl == NULL)
 283                 return (ENOIOCTL);
 284         g_disk_lock_giant(dp);
 285         error = dp->d_ioctl(dp, cmd, data, fflag, td);
 286         g_disk_unlock_giant(dp);
 287         return (error);
 288 }
 289
 290 static void
 291 g_disk_start(struct bio *bp)
 292 {
 293         struct bio *bp2, *bp3;
 294         struct disk *dp;
 295         struct g_disk_softc *sc;
 296         int error;
 297         off_t off;
 298
 299         sc = bp->bio_to->geom->softc;
 300         if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
 301                 g_io_deliver(bp, ENXIO);
 302                 return;
 303         }
 304         error = EJUSTRETURN;
 305         switch(bp->bio_cmd) {
 306         case BIO_DELETE:
 307                 if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
 308                         error = EOPNOTSUPP;
 309                         break;
 310                 }
 311                 /* fall-through */
 312         case BIO_READ:
 313         case BIO_WRITE:
 314                 off = 0;
 315                 bp3 = NULL;
 316                 bp2 = g_clone_bio(bp);
 317                 if (bp2 == NULL) {
 318                         error = ENOMEM;
 319                         break;
 320                 }
 321                 do {
 322                         bp2->bio_offset += off;
 323                         bp2->bio_length -= off;
 324                         bp2->bio_data += off;
 325                         if (bp2->bio_length > dp->d_maxsize) {
 326                                 /*
 327                                  * XXX: If we have a stripesize we should really
 328                                  * use it here.
 329                                  */
 330                                 bp2->bio_length = dp->d_maxsize;
 331                                 off += dp->d_maxsize;
 332                                 /*
 333                                  * To avoid a race, we need to grab the next bio
 334                                  * before we schedule this one.  See "notes".
 335                                  */
 336                                 bp3 = g_clone_bio(bp);
 337                                 if (bp3 == NULL)
 338                                         bp->bio_error = ENOMEM;
 339                         }
 340                         bp2->bio_done = g_disk_done;
 341                         bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
 342                         bp2->bio_bcount = bp2->bio_length;
 343                         bp2->bio_disk = dp;
 344                         devstat_start_transaction_bio(dp->d_devstat, bp2);
 345                         g_disk_lock_giant(dp);
 346                         dp->d_strategy(bp2);
 347                         g_disk_unlock_giant(dp);
 348                         bp2 = bp3;
 349                         bp3 = NULL;
 350                 } while (bp2 != NULL);
 351                 break;
 352         case BIO_GETATTR:
 353                 /* Give the driver a chance to override */
 354                 if (dp->d_getattr != NULL) {
 355                         if (bp->bio_disk == NULL)
 356                                 bp->bio_disk = dp;
 357                         error = dp->d_getattr(bp);
 358                         if (error != -1)
 359                                 break;
 360                         error = EJUSTRETURN;
 361                 }
 362                 if (g_handleattr_int(bp, "GEOM::candelete",
 363                     (dp->d_flags & DISKFLAG_CANDELETE) != 0))
 364                         break;
 365                 else if (g_handleattr_int(bp, "GEOM::fwsectors",
 366                     dp->d_fwsectors))
 367                         break;
 368                 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
 369                         break;
 370                 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
 371                         break;
 372                 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident))
 373                         break;
 374                 else if (g_handleattr(bp, "GEOM::hba_vendor",
 375                     &dp->d_hba_vendor, 2))
 376                         break;
 377                 else if (g_handleattr(bp, "GEOM::hba_device",
 378                     &dp->d_hba_device, 2))
 379                         break;
 380                 else if (g_handleattr(bp, "GEOM::hba_subvendor",
 381                     &dp->d_hba_subvendor, 2))
 382                         break;
 383                 else if (g_handleattr(bp, "GEOM::hba_subdevice",
 384                     &dp->d_hba_subdevice, 2))
 385                         break;
 386                 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
 387                         g_disk_kerneldump(bp, dp);
 388                 else if (!strcmp(bp->bio_attribute, "GEOM::setstate"))
 389                         g_disk_setstate(bp, sc);
 390                 else
 391                         error = ENOIOCTL;
 392                 break;
 393         case BIO_FLUSH:
 394                 g_trace(G_T_TOPOLOGY, "g_disk_flushcache(%s)",
 395                     bp->bio_to->name);
 396                 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) {
 397                         error = EOPNOTSUPP;
 398                         break;
 399                 }
 400                 bp2 = g_clone_bio(bp);
 401                 if (bp2 == NULL) {
 402                         g_io_deliver(bp, ENOMEM);
 403                         return;
 404                 }
 405                 bp2->bio_done = g_disk_done;
 406                 bp2->bio_disk = dp;
 407                 g_disk_lock_giant(dp);
 408                 dp->d_strategy(bp2);
 409                 g_disk_unlock_giant(dp);
 410                 break;
 411         default:
 412                 error = EOPNOTSUPP;
 413                 break;
 414         }
 415         if (error != EJUSTRETURN)
 416                 g_io_deliver(bp, error);
 417         return;
 418 }
 419
 420 static void
 421 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
 422 {
 423         struct disk *dp;
 424         struct g_disk_softc *sc;
 425
 426         sc = gp->softc;
 427         if (sc == NULL || (dp = sc->dp) == NULL)
 428                 return;
 429         if (indent == NULL) {
 430                 sbuf_printf(sb, " hd %u", dp->d_fwheads);
 431                 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
 432                 return;
 433         }
 434         if (pp != NULL) {
 435                 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
 436                     indent, dp->d_fwheads);
 437                 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
 438                     indent, dp->d_fwsectors);
 439                 sbuf_printf(sb, "%s<ident>%s</ident>\n", indent, dp->d_ident);
 440                 sbuf_printf(sb, "%s<descr>%s</descr>\n", indent, dp->d_descr);
 441         }
 442 }
 443
 444 static void
 445 g_disk_create(void *arg, int flag)
 446 {
 447         struct g_geom *gp;
 448         struct g_provider *pp;
 449         struct disk *dp;
 450         struct g_disk_softc *sc;
 451         char tmpstr[80];
 452
 453         if (flag == EV_CANCEL)
 454                 return;
 455         g_topology_assert();
 456         dp = arg;
 457         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
 458         sc->dp = dp;
 459         gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
 460         gp->softc = sc;
 461         pp = g_new_providerf(gp, "%s", gp->name);
 462         pp->mediasize = dp->d_mediasize;
 463         pp->sectorsize = dp->d_sectorsize;
 464         if (dp->d_flags & DISKFLAG_CANDELETE)
 465                 pp->flags |= G_PF_CANDELETE;
 466         pp->stripeoffset = dp->d_stripeoffset;
 467         pp->stripesize = dp->d_stripesize;
 468         if (bootverbose)
 469                 printf("GEOM: new disk %s\n", gp->name);
 470         sysctl_ctx_init(&sc->sysctl_ctx);
 471         snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name);
 472         sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
 473                 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name,
 474                 CTLFLAG_RD, 0, tmpstr);
 475         if (sc->sysctl_tree != NULL) {
 476                 snprintf(tmpstr, sizeof(tmpstr),
 477                     "kern.geom.disk.%s.led", gp->name);
 478                 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led));
 479                 SYSCTL_ADD_STRING(&sc->sysctl_ctx,
 480                     SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led",
 481                     CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led),
 482                     "LED name");
 483         }
 484         pp->private = sc;
 485         dp->d_geom = gp;
 486         g_error_provider(pp, 0);
 487 }
 488
 489 static void
 490 g_disk_destroy(void *ptr, int flag)
 491 {
 492         struct disk *dp;
 493         struct g_geom *gp;
 494         struct g_disk_softc *sc;
 495
 496         g_topology_assert();
 497         dp = ptr;
 498         gp = dp->d_geom;
 499         if (gp != NULL) {
 500                 sc = gp->softc;
 501                 if (sc->sysctl_tree != NULL) {
 502                         sysctl_ctx_free(&sc->sysctl_ctx);
 503                         sc->sysctl_tree = NULL;
 504                 }
 505                 if (sc->led[0] != 0) {
 506                         led_set(sc->led, "0");
 507                         sc->led[0] = 0;
 508                 }
 509                 g_free(sc);
 510                 gp->softc = NULL;
 511                 g_wither_geom(gp, ENXIO);
 512         }
 513         g_free(dp);
 514 }
 515
 516 /*
 517  * We only allow printable characters in disk ident,
 518  * the rest is converted to 'x<HH>'.
 519  */
 520 static void
 521 g_disk_ident_adjust(char *ident, size_t size)
 522 {
 523         char *p, tmp[4], newid[DISK_IDENT_SIZE];
 524
 525         newid[0] = '\0';
 526         for (p = ident; *p != '\0'; p++) {
 527                 if (isprint(*p)) {
 528                         tmp[0] = *p;
 529                         tmp[1] = '\0';
 530                 } else {
 531                         snprintf(tmp, sizeof(tmp), "x%02hhx",
 532                             *(unsigned char *)p);
 533                 }
 534                 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid))
 535                         break;
 536         }
 537         bzero(ident, size);
 538         strlcpy(ident, newid, size);
 539 }
 540
 541 struct disk *
 542 disk_alloc(void)
 543 {
 544
 545         return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO));
 546 }
 547
 548 void
 549 disk_create(struct disk *dp, int version)
 550 {
 551
 552         if (version != DISK_VERSION_00 && version != DISK_VERSION_01) {
 553                 printf("WARNING: Attempt to add disk %s%d %s",
 554                     dp->d_name, dp->d_unit,
 555                     " using incompatible ABI version of disk(9)\n");
 556                 printf("WARNING: Ignoring disk %s%d\n",
 557                     dp->d_name, dp->d_unit);
 558                 return;
 559         }
 560         KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
 561         KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
 562         KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
 563         KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
 564         if (dp->d_devstat == NULL)
 565                 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
 566                     dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
 567                     DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
 568         dp->d_geom = NULL;
 569         g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident));
 570         g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
 571 }
 572
 573 void
 574 disk_destroy(struct disk *dp)
 575 {
 576
 577         g_cancel_event(dp);
 578         dp->d_destroyed = 1;
 579         if (dp->d_devstat != NULL)
 580                 devstat_remove_entry(dp->d_devstat);
 581         g_post_event(g_disk_destroy, dp, M_WAITOK, NULL);
 582 }
 583
 584 void
 585 disk_gone(struct disk *dp)
 586 {
 587         struct g_geom *gp;
 588         struct g_provider *pp;
 589
 590         gp = dp->d_geom;
 591         if (gp != NULL)
 592                 LIST_FOREACH(pp, &gp->provider, provider)
 593                         g_wither_provider(pp, ENXIO);
 594 }
 595
 596 void
 597 disk_attr_changed(struct disk *dp, const char *attr, int flag)
 598 {
 599         struct g_geom *gp;
 600         struct g_provider *pp;
 601
 602         gp = dp->d_geom;
 603         if (gp != NULL)
 604                 LIST_FOREACH(pp, &gp->provider, provider)
 605                         (void)g_attr_changed(pp, attr, flag);
 606 }
 607
 608 static void
 609 g_kern_disks(void *p, int flag __unused)
 610 {
 611         struct sbuf *sb;
 612         struct g_geom *gp;
 613         char *sp;
 614
 615         sb = p;
 616         sp = "";
 617         g_topology_assert();
 618         LIST_FOREACH(gp, &g_disk_class.geom, geom) {
 619                 sbuf_printf(sb, "%s%s", sp, gp->name);
 620                 sp = " ";
 621         }
 622         sbuf_finish(sb);
 623 }
 624
 625 static int
 626 sysctl_disks(SYSCTL_HANDLER_ARGS)
 627 {
 628         int error;
 629         struct sbuf *sb;
 630
 631         sb = sbuf_new_auto();
 632         g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
 633         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
 634         sbuf_delete(sb);
 635         return error;
 636 }
 637
 638 SYSCTL_PROC(_kern, OID_AUTO, disks,
 639     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 640     sysctl_disks, "A", "names of available disks");