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