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                         if (error != 0)
 142                                 return (error);
 143                 }
 144                 pp->mediasize = dp->d_mediasize;
 145                 pp->sectorsize = dp->d_sectorsize;
 146                 if (dp->d_flags & DISKFLAG_CANDELETE)
 147                         pp->flags |= G_PF_CANDELETE;
 148                 else
 149                         pp->flags &= ~G_PF_CANDELETE;
 150                 pp->stripeoffset = dp->d_stripeoffset;
 151                 pp->stripesize = dp->d_stripesize;
 152                 dp->d_flags |= DISKFLAG_OPEN;
 153                 if (dp->d_maxsize == 0) {
 154                         printf("WARNING: Disk drive %s%d has no d_maxsize\n",
 155                             dp->d_name, dp->d_unit);
 156                         dp->d_maxsize = DFLTPHYS;
 157                 }
 158                 if (dp->d_delmaxsize == 0) {
 159                         if (bootverbose && dp->d_flags & DISKFLAG_CANDELETE) {
 160                                 printf("WARNING: Disk drive %s%d has no "
 161                                     "d_delmaxsize\n", dp->d_name, dp->d_unit);
 162                         }
 163                         dp->d_delmaxsize = dp->d_maxsize;
 164                 }
 165         } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
 166                 if (dp->d_close != NULL) {
 167                         g_disk_lock_giant(dp);
 168                         error = dp->d_close(dp);
 169                         if (error != 0)
 170                                 printf("Closed disk %s -> %d\n",
 171                                     pp->name, error);
 172                         g_disk_unlock_giant(dp);
 173                 }
 174                 sc->state = G_STATE_ACTIVE;
 175                 if (sc->led[0] != 0)
 176                         led_set(sc->led, "0");
 177                 dp->d_flags &= ~DISKFLAG_OPEN;
 178         }
 179         return (error);
 180 }
 181
 182 static void
 183 g_disk_kerneldump(struct bio *bp, struct disk *dp)
 184 {
 185         struct g_kerneldump *gkd;
 186         struct g_geom *gp;
 187
 188         gkd = (struct g_kerneldump*)bp->bio_data;
 189         gp = bp->bio_to->geom;
 190         g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)",
 191                 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
 192         if (dp->d_dump == NULL) {
 193                 g_io_deliver(bp, ENODEV);
 194                 return;
 195         }
 196         gkd->di.dumper = dp->d_dump;
 197         gkd->di.priv = dp;
 198         gkd->di.blocksize = dp->d_sectorsize;
 199         gkd->di.maxiosize = dp->d_maxsize;
 200         gkd->di.mediaoffset = gkd->offset;
 201         if ((gkd->offset + gkd->length) > dp->d_mediasize)
 202                 gkd->length = dp->d_mediasize - gkd->offset;
 203         gkd->di.mediasize = gkd->length;
 204         g_io_deliver(bp, 0);
 205 }
 206
 207 static void
 208 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc)
 209 {
 210         const char *cmd;
 211
 212         memcpy(&sc->state, bp->bio_data, sizeof(sc->state));
 213         if (sc->led[0] != 0) {
 214                 switch (sc->state) {
 215                 case G_STATE_FAILED:
 216                         cmd = "1";
 217                         break;
 218                 case G_STATE_REBUILD:
 219                         cmd = "f5";
 220                         break;
 221                 case G_STATE_RESYNC:
 222                         cmd = "f1";
 223                         break;
 224                 default:
 225                         cmd = "0";
 226                         break;
 227                 }
 228                 led_set(sc->led, cmd);
 229         }
 230         g_io_deliver(bp, 0);
 231 }
 232
 233 static void
 234 g_disk_done(struct bio *bp)
 235 {
 236         struct bio *bp2;
 237         struct g_disk_softc *sc;
 238
 239         /* See "notes" for why we need a mutex here */
 240         /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */
 241         bp2 = bp->bio_parent;
 242         sc = bp2->bio_to->private;
 243         bp->bio_completed = bp->bio_length - bp->bio_resid;
 244         mtx_lock(&sc->done_mtx);
 245         if (bp2->bio_error == 0)
 246                 bp2->bio_error = bp->bio_error;
 247         bp2->bio_completed += bp->bio_completed;
 248         if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) != 0)
 249                 devstat_end_transaction_bio(sc->dp->d_devstat, bp);
 250         g_destroy_bio(bp);
 251         bp2->bio_inbed++;
 252         if (bp2->bio_children == bp2->bio_inbed) {
 253                 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
 254                 g_io_deliver(bp2, bp2->bio_error);
 255         }
 256         mtx_unlock(&sc->done_mtx);
 257 }
 258
 259 static int
 260 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
 261 {
 262         struct disk *dp;
 263         struct g_disk_softc *sc;
 264         int error;
 265
 266         sc = pp->private;
 267         dp = sc->dp;
 268
 269         if (dp->d_ioctl == NULL)
 270                 return (ENOIOCTL);
 271         g_disk_lock_giant(dp);
 272         error = dp->d_ioctl(dp, cmd, data, fflag, td);
 273         g_disk_unlock_giant(dp);
 274         return (error);
 275 }
 276
 277 static void
 278 g_disk_start(struct bio *bp)
 279 {
 280         struct bio *bp2, *bp3;
 281         struct disk *dp;
 282         struct g_disk_softc *sc;
 283         int error;
 284         off_t off;
 285
 286         sc = bp->bio_to->private;
 287         if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
 288                 g_io_deliver(bp, ENXIO);
 289                 return;
 290         }
 291         error = EJUSTRETURN;
 292         switch(bp->bio_cmd) {
 293         case BIO_DELETE:
 294                 if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
 295                         error = EOPNOTSUPP;
 296                         break;
 297                 }
 298                 /* fall-through */
 299         case BIO_READ:
 300         case BIO_WRITE:
 301                 off = 0;
 302                 bp3 = NULL;
 303                 bp2 = g_clone_bio(bp);
 304                 if (bp2 == NULL) {
 305                         error = ENOMEM;
 306                         break;
 307                 }
 308                 do {
 309                         off_t d_maxsize;
 310
 311                         d_maxsize = (bp->bio_cmd == BIO_DELETE &&
 312                             (dp->d_flags & DISKFLAG_LACKS_DELMAX) == 0) ?
 313                             dp->d_delmaxsize : dp->d_maxsize;
 314
 315                         bp2->bio_offset += off;
 316                         bp2->bio_length -= off;
 317                         if ((bp->bio_flags & BIO_UNMAPPED) == 0) {
 318                                 bp2->bio_data += off;
 319                         } else {
 320                                 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO)
 321                                     != 0,
 322                                     ("unmapped bio not supported by disk %s",
 323                                     dp->d_name));
 324                                 bp2->bio_ma += off / PAGE_SIZE;
 325                                 bp2->bio_ma_offset += off;
 326                                 bp2->bio_ma_offset %= PAGE_SIZE;
 327                                 bp2->bio_ma_n -= off / PAGE_SIZE;
 328                         }
 329                         if (bp2->bio_length > d_maxsize) {
 330                                 /*
 331                                  * XXX: If we have a stripesize we should really
 332                                  * use it here. Care should be taken in the delete
 333                                  * case if this is done as deletes can be very
 334                                  * sensitive to size given how they are processed.
 335                                  */
 336                                 bp2->bio_length = d_maxsize;
 337                                 if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
 338                                         bp2->bio_ma_n = howmany(
 339                                             bp2->bio_ma_offset +
 340                                             bp2->bio_length, PAGE_SIZE);
 341                                 }
 342                                 off += d_maxsize;
 343                                 /*
 344                                  * To avoid a race, we need to grab the next bio
 345                                  * before we schedule this one.  See "notes".
 346                                  */
 347                                 bp3 = g_clone_bio(bp);
 348                                 if (bp3 == NULL)
 349                                         bp->bio_error = ENOMEM;
 350                         }
 351                         bp2->bio_done = g_disk_done;
 352                         bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
 353                         bp2->bio_bcount = bp2->bio_length;
 354                         bp2->bio_disk = dp;
 355                         devstat_start_transaction_bio(dp->d_devstat, bp2);
 356                         g_disk_lock_giant(dp);
 357                         dp->d_strategy(bp2);
 358                         g_disk_unlock_giant(dp);
 359                         bp2 = bp3;
 360                         bp3 = NULL;
 361                 } while (bp2 != NULL);
 362                 break;
 363         case BIO_GETATTR:
 364                 /* Give the driver a chance to override */
 365                 if (dp->d_getattr != NULL) {
 366                         if (bp->bio_disk == NULL)
 367                                 bp->bio_disk = dp;
 368                         error = dp->d_getattr(bp);
 369                         if (error != -1)
 370                                 break;
 371                         error = EJUSTRETURN;
 372                 }
 373                 if (g_handleattr_int(bp, "GEOM::candelete",
 374                     (dp->d_flags & DISKFLAG_CANDELETE) != 0))
 375                         break;
 376                 else if (g_handleattr_int(bp, "GEOM::fwsectors",
 377                     dp->d_fwsectors))
 378                         break;
 379                 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
 380                         break;
 381                 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
 382                         break;
 383                 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident))
 384                         break;
 385                 else if (g_handleattr(bp, "GEOM::hba_vendor",
 386                     &dp->d_hba_vendor, 2))
 387                         break;
 388                 else if (g_handleattr(bp, "GEOM::hba_device",
 389                     &dp->d_hba_device, 2))
 390                         break;
 391                 else if (g_handleattr(bp, "GEOM::hba_subvendor",
 392                     &dp->d_hba_subvendor, 2))
 393                         break;
 394                 else if (g_handleattr(bp, "GEOM::hba_subdevice",
 395                     &dp->d_hba_subdevice, 2))
 396                         break;
 397                 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
 398                         g_disk_kerneldump(bp, dp);
 399                 else if (!strcmp(bp->bio_attribute, "GEOM::setstate"))
 400                         g_disk_setstate(bp, sc);
 401                 else
 402                         error = ENOIOCTL;
 403                 break;
 404         case BIO_FLUSH:
 405                 g_trace(G_T_BIO, "g_disk_flushcache(%s)",
 406                     bp->bio_to->name);
 407                 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) {
 408                         error = EOPNOTSUPP;
 409                         break;
 410                 }
 411                 bp2 = g_clone_bio(bp);
 412                 if (bp2 == NULL) {
 413                         g_io_deliver(bp, ENOMEM);
 414                         return;
 415                 }
 416                 bp2->bio_done = g_disk_done;
 417                 bp2->bio_disk = dp;
 418                 g_disk_lock_giant(dp);
 419                 dp->d_strategy(bp2);
 420                 g_disk_unlock_giant(dp);
 421                 break;
 422         default:
 423                 error = EOPNOTSUPP;
 424                 break;
 425         }
 426         if (error != EJUSTRETURN)
 427                 g_io_deliver(bp, error);
 428         return;
 429 }
 430
 431 static void
 432 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
 433 {
 434         struct bio *bp;
 435         struct disk *dp;
 436         struct g_disk_softc *sc;
 437         char *buf;
 438         int res = 0;
 439
 440         sc = gp->softc;
 441         if (sc == NULL || (dp = sc->dp) == NULL)
 442                 return;
 443         if (indent == NULL) {
 444                 sbuf_printf(sb, " hd %u", dp->d_fwheads);
 445                 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
 446                 return;
 447         }
 448         if (pp != NULL) {
 449                 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
 450                     indent, dp->d_fwheads);
 451                 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
 452                     indent, dp->d_fwsectors);
 453                 if (dp->d_getattr != NULL) {
 454                         buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK);
 455                         bp = g_alloc_bio();
 456                         bp->bio_disk = dp;
 457                         bp->bio_attribute = "GEOM::ident";
 458                         bp->bio_length = DISK_IDENT_SIZE;
 459                         bp->bio_data = buf;
 460                         res = dp->d_getattr(bp);
 461                         sbuf_printf(sb, "%s<ident>%s</ident>\n", indent,
 462                             res == 0 ? buf: dp->d_ident);
 463                         bp->bio_attribute = "GEOM::lunid";
 464                         bp->bio_length = DISK_IDENT_SIZE;
 465                         bp->bio_data = buf;
 466                         if (dp->d_getattr(bp) == 0)
 467                                 sbuf_printf(sb, "%s<lunid>%s</lunid>\n",
 468                                     indent, buf);
 469                         bp->bio_attribute = "GEOM::lunname";
 470                         bp->bio_length = DISK_IDENT_SIZE;
 471                         bp->bio_data = buf;
 472                         if (dp->d_getattr(bp) == 0)
 473                                 sbuf_printf(sb, "%s<lunname>%s</lunname>\n",
 474                                     indent, buf);
 475                         g_destroy_bio(bp);
 476                         g_free(buf);
 477                 } else
 478                         sbuf_printf(sb, "%s<ident>%s</ident>\n", indent,
 479                             dp->d_ident);
 480                 sbuf_printf(sb, "%s<descr>%s</descr>\n", indent, dp->d_descr);
 481         }
 482 }
 483
 484 static void
 485 g_disk_create(void *arg, int flag)
 486 {
 487         struct g_geom *gp;
 488         struct g_provider *pp;
 489         struct disk *dp;
 490         struct g_disk_softc *sc;
 491         char tmpstr[80];
 492
 493         if (flag == EV_CANCEL)
 494                 return;
 495         g_topology_assert();
 496         dp = arg;
 497         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
 498         mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF);
 499         sc->dp = dp;
 500         gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
 501         gp->softc = sc;
 502         pp = g_new_providerf(gp, "%s", gp->name);
 503         pp->mediasize = dp->d_mediasize;
 504         pp->sectorsize = dp->d_sectorsize;
 505         if (dp->d_flags & DISKFLAG_CANDELETE)
 506                 pp->flags |= G_PF_CANDELETE;
 507         pp->stripeoffset = dp->d_stripeoffset;
 508         pp->stripesize = dp->d_stripesize;
 509         if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0)
 510                 pp->flags |= G_PF_ACCEPT_UNMAPPED;
 511         if (bootverbose)
 512                 printf("GEOM: new disk %s\n", gp->name);
 513         sysctl_ctx_init(&sc->sysctl_ctx);
 514         snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name);
 515         sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
 516                 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name,
 517                 CTLFLAG_RD, 0, tmpstr);
 518         if (sc->sysctl_tree != NULL) {
 519                 snprintf(tmpstr, sizeof(tmpstr),
 520                     "kern.geom.disk.%s.led", gp->name);
 521                 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led));
 522                 SYSCTL_ADD_STRING(&sc->sysctl_ctx,
 523                     SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led",
 524                     CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led),
 525                     "LED name");
 526         }
 527         pp->private = sc;
 528         dp->d_geom = gp;
 529         g_error_provider(pp, 0);
 530 }
 531
 532 /*
 533  * We get this callback after all of the consumers have gone away, and just
 534  * before the provider is freed.  If the disk driver provided a d_gone
 535  * callback, let them know that it is okay to free resources -- they won't
 536  * be getting any more accesses from GEOM.
 537  */
 538 static void
 539 g_disk_providergone(struct g_provider *pp)
 540 {
 541         struct disk *dp;
 542         struct g_disk_softc *sc;
 543
 544         sc = (struct g_disk_softc *)pp->private;
 545         dp = sc->dp;
 546
 547         /*
 548          * FreeBSD 9 started with VERSION_01 of the struct disk structure.
 549          * However, g_gone was added in the middle of the branch.  To
 550          * cope with version being missing from struct disk, we set a flag
 551          * in g_disk_create for VERSION_01 and avoid touching the d_gone
 552          * field for old consumers.
 553          */
 554         if (dp != NULL && (dp->d_flags & DISKFLAG_LACKS_GONE) == 0 &&
 555             dp->d_gone != NULL)
 556                 dp->d_gone(dp);
 557         if (sc->sysctl_tree != NULL) {
 558                 sysctl_ctx_free(&sc->sysctl_ctx);
 559                 sc->sysctl_tree = NULL;
 560         }
 561         if (sc->led[0] != 0) {
 562                 led_set(sc->led, "0");
 563                 sc->led[0] = 0;
 564         }
 565         pp->private = NULL;
 566         pp->geom->softc = NULL;
 567         mtx_destroy(&sc->done_mtx);
 568         g_free(sc);
 569 }
 570
 571 static void
 572 g_disk_destroy(void *ptr, int flag)
 573 {
 574         struct disk *dp;
 575         struct g_geom *gp;
 576         struct g_disk_softc *sc;
 577
 578         g_topology_assert();
 579         dp = ptr;
 580         gp = dp->d_geom;
 581         if (gp != NULL) {
 582                 sc = gp->softc;
 583                 if (sc != NULL)
 584                         sc->dp = NULL;
 585                 dp->d_geom = NULL;
 586                 g_wither_geom(gp, ENXIO);
 587         }
 588         g_free(dp);
 589 }
 590
 591 /*
 592  * We only allow printable characters in disk ident,
 593  * the rest is converted to 'x<HH>'.
 594  */
 595 static void
 596 g_disk_ident_adjust(char *ident, size_t size)
 597 {
 598         char *p, tmp[4], newid[DISK_IDENT_SIZE];
 599
 600         newid[0] = '\0';
 601         for (p = ident; *p != '\0'; p++) {
 602                 if (isprint(*p)) {
 603                         tmp[0] = *p;
 604                         tmp[1] = '\0';
 605                 } else {
 606                         snprintf(tmp, sizeof(tmp), "x%02hhx",
 607                             *(unsigned char *)p);
 608                 }
 609                 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid))
 610                         break;
 611         }
 612         bzero(ident, size);
 613         strlcpy(ident, newid, size);
 614 }
 615
 616 struct disk *
 617 disk_alloc(void)
 618 {
 619
 620         return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO));
 621 }
 622
 623 void
 624 disk_create(struct disk *dp, int version)
 625 {
 626
 627         if (version != DISK_VERSION_03 && version != DISK_VERSION_02 &&
 628             version != DISK_VERSION_01) {
 629                 printf("WARNING: Attempt to add disk %s%d %s",
 630                     dp->d_name, dp->d_unit,
 631                     " using incompatible ABI version of disk(9)\n");
 632                 printf("WARNING: Ignoring disk %s%d\n",
 633                     dp->d_name, dp->d_unit);
 634                 return;
 635         }
 636         if (version == DISK_VERSION_01)
 637                 dp->d_flags |= DISKFLAG_LACKS_GONE;
 638         if (version < DISK_VERSION_03)
 639                 dp->d_flags |= DISKFLAG_LACKS_DELMAX;
 640         KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
 641         KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
 642         KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
 643         KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
 644         if (dp->d_devstat == NULL)
 645                 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
 646                     dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
 647                     DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
 648         dp->d_geom = NULL;
 649         g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident));
 650         g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
 651 }
 652
 653 void
 654 disk_destroy(struct disk *dp)
 655 {
 656
 657         g_cancel_event(dp);
 658         dp->d_destroyed = 1;
 659         if (dp->d_devstat != NULL)
 660                 devstat_remove_entry(dp->d_devstat);
 661         g_post_event(g_disk_destroy, dp, M_WAITOK, NULL);
 662 }
 663
 664 void
 665 disk_gone(struct disk *dp)
 666 {
 667         struct g_geom *gp;
 668         struct g_provider *pp;
 669
 670         gp = dp->d_geom;
 671         if (gp != NULL) {
 672                 pp = LIST_FIRST(&gp->provider);
 673                 if (pp != NULL) {
 674                         KASSERT(LIST_NEXT(pp, provider) == NULL,
 675                             ("geom %p has more than one provider", gp));
 676                         g_wither_provider(pp, ENXIO);
 677                 }
 678         }
 679 }
 680
 681 void
 682 disk_attr_changed(struct disk *dp, const char *attr, int flag)
 683 {
 684         struct g_geom *gp;
 685         struct g_provider *pp;
 686
 687         gp = dp->d_geom;
 688         if (gp != NULL)
 689                 LIST_FOREACH(pp, &gp->provider, provider)
 690                         (void)g_attr_changed(pp, attr, flag);
 691 }
 692
 693 void
 694 disk_media_changed(struct disk *dp, int flag)
 695 {
 696         struct g_geom *gp;
 697         struct g_provider *pp;
 698
 699         gp = dp->d_geom;
 700         if (gp != NULL) {
 701                 pp = LIST_FIRST(&gp->provider);
 702                 if (pp != NULL) {
 703                         KASSERT(LIST_NEXT(pp, provider) == NULL,
 704                             ("geom %p has more than one provider", gp));
 705                         g_media_changed(pp, flag);
 706                 }
 707         }
 708 }
 709
 710 void
 711 disk_media_gone(struct disk *dp, int flag)
 712 {
 713         struct g_geom *gp;
 714         struct g_provider *pp;
 715
 716         gp = dp->d_geom;
 717         if (gp != NULL) {
 718                 pp = LIST_FIRST(&gp->provider);
 719                 if (pp != NULL) {
 720                         KASSERT(LIST_NEXT(pp, provider) == NULL,
 721                             ("geom %p has more than one provider", gp));
 722                         g_media_gone(pp, flag);
 723                 }
 724         }
 725 }
 726
 727 static void
 728 g_kern_disks(void *p, int flag __unused)
 729 {
 730         struct sbuf *sb;
 731         struct g_geom *gp;
 732         char *sp;
 733
 734         sb = p;
 735         sp = "";
 736         g_topology_assert();
 737         LIST_FOREACH(gp, &g_disk_class.geom, geom) {
 738                 sbuf_printf(sb, "%s%s", sp, gp->name);
 739                 sp = " ";
 740         }
 741         sbuf_finish(sb);
 742 }
 743
 744 static int
 745 sysctl_disks(SYSCTL_HANDLER_ARGS)
 746 {
 747         int error;
 748         struct sbuf *sb;
 749
 750         sb = sbuf_new_auto();
 751         g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
 752         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
 753         sbuf_delete(sb);
 754         return error;
 755 }
 756
 757 SYSCTL_PROC(_kern, OID_AUTO, disks,
 758     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 759     sysctl_disks, "A", "names of available disks");