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