sys/geom/geom_disk.c

   1 /*-
   2  * Copyright (c) 2002 Poul-Henning Kamp
   3  * Copyright (c) 2002 Networks Associates Technology, Inc.
   4  * All rights reserved.
   5  *
   6  * This software was developed for the FreeBSD Project by Poul-Henning Kamp
   7  * and NAI Labs, the Security Research Division of Network Associates, Inc.
   8  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
   9  * DARPA CHATS research program.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. The names of the authors may not be used to endorse or promote
  20  *    products derived from this software without specific prior written
  21  *    permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD$");
  38
  39 #include "opt_geom.h"
  40
  41 #include <sys/param.h>
  42 #include <sys/systm.h>
  43 #include <sys/kernel.h>
  44 #include <sys/sysctl.h>
  45 #include <sys/bio.h>
  46 #include <sys/ctype.h>
  47 #include <sys/fcntl.h>
  48 #include <sys/malloc.h>
  49 #include <sys/sbuf.h>
  50 #include <sys/sysctl.h>
  51 #include <sys/devicestat.h>
  52 #include <machine/md_var.h>
  53
  54 #include <sys/lock.h>
  55 #include <sys/mutex.h>
  56 #include <geom/geom.h>
  57 #include <geom/geom_disk.h>
  58 #include <geom/geom_int.h>
  59
  60 #include <dev/led/led.h>
  61
  62 struct g_disk_softc {
  63         struct mtx               done_mtx;
  64         struct disk             *dp;
  65         struct sysctl_ctx_list  sysctl_ctx;
  66         struct sysctl_oid       *sysctl_tree;
  67         char                    led[64];
  68         uint32_t                state;
  69 };
  70
  71 static g_access_t g_disk_access;
  72 static g_start_t g_disk_start;
  73 static g_ioctl_t g_disk_ioctl;
  74 static g_dumpconf_t g_disk_dumpconf;
  75 static g_provgone_t g_disk_providergone;
  76
  77 static struct g_class g_disk_class = {
  78         .name = "DISK",
  79         .version = G_VERSION,
  80         .start = g_disk_start,
  81         .access = g_disk_access,
  82         .ioctl = g_disk_ioctl,
  83         .providergone = g_disk_providergone,
  84         .dumpconf = g_disk_dumpconf,
  85 };
  86
  87 SYSCTL_DECL(_kern_geom);
  88 static SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0,
  89     "GEOM_DISK stuff");
  90
  91 DECLARE_GEOM_CLASS(g_disk_class, g_disk);
  92
  93 static void __inline
  94 g_disk_lock_giant(struct disk *dp)
  95 {
  96
  97         if (dp->d_flags & DISKFLAG_NEEDSGIANT)
  98                 mtx_lock(&Giant);
  99 }
 100
 101 static void __inline
 102 g_disk_unlock_giant(struct disk *dp)
 103 {
 104
 105         if (dp->d_flags & DISKFLAG_NEEDSGIANT)
 106                 mtx_unlock(&Giant);
 107 }
 108
 109 static int
 110 g_disk_access(struct g_provider *pp, int r, int w, int e)
 111 {
 112         struct disk *dp;
 113         struct g_disk_softc *sc;
 114         int error;
 115
 116         g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
 117             pp->name, r, w, e);
 118         g_topology_assert();
 119         sc = pp->private;
 120         if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
 121                 /*
 122                  * Allow decreasing access count even if disk is not
 123                  * avaliable anymore.
 124                  */
 125                 if (r <= 0 && w <= 0 && e <= 0)
 126                         return (0);
 127                 return (ENXIO);
 128         }
 129         r += pp->acr;
 130         w += pp->acw;
 131         e += pp->ace;
 132         error = 0;
 133         if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
 134                 if (dp->d_open != NULL) {
 135                         g_disk_lock_giant(dp);
 136                         error = dp->d_open(dp);
 137                         if (bootverbose && error != 0)
 138                                 printf("Opened disk %s -> %d\n",
 139                                     pp->name, error);
 140                         g_disk_unlock_giant(dp);
 141                 }
 142                 pp->mediasize = dp->d_mediasize;
 143                 pp->sectorsize = dp->d_sectorsize;
 144                 if (dp->d_flags & DISKFLAG_CANDELETE)
 145                         pp->flags |= G_PF_CANDELETE;
 146                 else
 147                         pp->flags &= ~G_PF_CANDELETE;
 148                 pp->stripeoffset = dp->d_stripeoffset;
 149                 pp->stripesize = dp->d_stripesize;
 150                 dp->d_flags |= DISKFLAG_OPEN;
 151                 if (dp->d_maxsize == 0) {
 152                         printf("WARNING: Disk drive %s%d has no d_maxsize\n",
 153                             dp->d_name, dp->d_unit);
 154                         dp->d_maxsize = DFLTPHYS;
 155                 }
 156         } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
 157                 if (dp->d_close != NULL) {
 158                         g_disk_lock_giant(dp);
 159                         error = dp->d_close(dp);
 160                         if (error != 0)
 161                                 printf("Closed disk %s -> %d\n",
 162                                     pp->name, error);
 163                         g_disk_unlock_giant(dp);
 164                 }
 165                 sc->state = G_STATE_ACTIVE;
 166                 if (sc->led[0] != 0)
 167                         led_set(sc->led, "0");
 168                 dp->d_flags &= ~DISKFLAG_OPEN;
 169         }
 170         return (error);
 171 }
 172
 173 static void
 174 g_disk_kerneldump(struct bio *bp, struct disk *dp)
 175 {
 176         struct g_kerneldump *gkd;
 177         struct g_geom *gp;
 178
 179         gkd = (struct g_kerneldump*)bp->bio_data;
 180         gp = bp->bio_to->geom;
 181         g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)",
 182                 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
 183         if (dp->d_dump == NULL) {
 184                 g_io_deliver(bp, ENODEV);
 185                 return;
 186         }
 187         gkd->di.dumper = dp->d_dump;
 188         gkd->di.priv = dp;
 189         gkd->di.blocksize = dp->d_sectorsize;
 190         gkd->di.maxiosize = dp->d_maxsize;
 191         gkd->di.mediaoffset = gkd->offset;
 192         if ((gkd->offset + gkd->length) > dp->d_mediasize)
 193                 gkd->length = dp->d_mediasize - gkd->offset;
 194         gkd->di.mediasize = gkd->length;
 195         g_io_deliver(bp, 0);
 196 }
 197
 198 static void
 199 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc)
 200 {
 201         const char *cmd;
 202
 203         memcpy(&sc->state, bp->bio_data, sizeof(sc->state));
 204         if (sc->led[0] != 0) {
 205                 switch (sc->state) {
 206                 case G_STATE_FAILED:
 207                         cmd = "1";
 208                         break;
 209                 case G_STATE_REBUILD:
 210                         cmd = "f5";
 211                         break;
 212                 case G_STATE_RESYNC:
 213                         cmd = "f1";
 214                         break;
 215                 default:
 216                         cmd = "0";
 217                         break;
 218                 }
 219                 led_set(sc->led, cmd);
 220         }
 221         g_io_deliver(bp, 0);
 222 }
 223
 224 static void
 225 g_disk_done(struct bio *bp)
 226 {
 227         struct bio *bp2;
 228         struct g_disk_softc *sc;
 229
 230         /* See "notes" for why we need a mutex here */
 231         /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */
 232         bp2 = bp->bio_parent;
 233         sc = bp2->bio_to->private;
 234         bp->bio_completed = bp->bio_length - bp->bio_resid;
 235         mtx_lock(&sc->done_mtx);
 236         if (bp2->bio_error == 0)
 237                 bp2->bio_error = bp->bio_error;
 238         bp2->bio_completed += bp->bio_completed;
 239         if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) != 0)
 240                 devstat_end_transaction_bio(sc->dp->d_devstat, bp);
 241         g_destroy_bio(bp);
 242         bp2->bio_inbed++;
 243         if (bp2->bio_children == bp2->bio_inbed) {
 244                 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
 245                 g_io_deliver(bp2, bp2->bio_error);
 246         }
 247         mtx_unlock(&sc->done_mtx);
 248 }
 249
 250 static int
 251 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
 252 {
 253         struct disk *dp;
 254         struct g_disk_softc *sc;
 255         int error;
 256
 257         sc = pp->private;
 258         dp = sc->dp;
 259
 260         if (dp->d_ioctl == NULL)
 261                 return (ENOIOCTL);
 262         g_disk_lock_giant(dp);
 263         error = dp->d_ioctl(dp, cmd, data, fflag, td);
 264         g_disk_unlock_giant(dp);
 265         return (error);
 266 }
 267
 268 static void
 269 g_disk_start(struct bio *bp)
 270 {
 271         struct bio *bp2, *bp3;
 272         struct disk *dp;
 273         struct g_disk_softc *sc;
 274         int error;
 275         off_t off;
 276
 277         sc = bp->bio_to->private;
 278         if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
 279                 g_io_deliver(bp, ENXIO);
 280                 return;
 281         }
 282         error = EJUSTRETURN;
 283         switch(bp->bio_cmd) {
 284         case BIO_DELETE:
 285                 if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
 286                         error = EOPNOTSUPP;
 287                         break;
 288                 }
 289                 /* fall-through */
 290         case BIO_READ:
 291         case BIO_WRITE:
 292                 off = 0;
 293                 bp3 = NULL;
 294                 bp2 = g_clone_bio(bp);
 295                 if (bp2 == NULL) {
 296                         error = ENOMEM;
 297                         break;
 298                 }
 299                 do {
 300                         bp2->bio_offset += off;
 301                         bp2->bio_length -= off;
 302                         if ((bp->bio_flags & BIO_UNMAPPED) == 0) {
 303                                 bp2->bio_data += off;
 304                         } else {
 305                                 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO)
 306                                     != 0,
 307                                     ("unmapped bio not supported by disk %s",
 308                                     dp->d_name));
 309                                 bp2->bio_ma += off / PAGE_SIZE;
 310                                 bp2->bio_ma_offset += off;
 311                                 bp2->bio_ma_offset %= PAGE_SIZE;
 312                                 bp2->bio_ma_n -= off / PAGE_SIZE;
 313                         }
 314                         if (bp2->bio_length > dp->d_maxsize) {
 315                                 /*
 316                                  * XXX: If we have a stripesize we should really
 317                                  * use it here.
 318                                  */
 319                                 bp2->bio_length = dp->d_maxsize;
 320                                 if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
 321                                         bp2->bio_ma_n = howmany(
 322                                             bp2->bio_ma_offset +
 323                                             bp2->bio_length, PAGE_SIZE);
 324                                 }
 325                                 off += dp->d_maxsize;
 326                                 /*
 327                                  * To avoid a race, we need to grab the next bio
 328                                  * before we schedule this one.  See "notes".
 329                                  */
 330                                 bp3 = g_clone_bio(bp);
 331                                 if (bp3 == NULL)
 332                                         bp->bio_error = ENOMEM;
 333                         }
 334                         bp2->bio_done = g_disk_done;
 335                         bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
 336                         bp2->bio_bcount = bp2->bio_length;
 337                         bp2->bio_disk = dp;
 338                         devstat_start_transaction_bio(dp->d_devstat, bp2);
 339                         g_disk_lock_giant(dp);
 340                         dp->d_strategy(bp2);
 341                         g_disk_unlock_giant(dp);
 342                         bp2 = bp3;
 343                         bp3 = NULL;
 344                 } while (bp2 != NULL);
 345                 break;
 346         case BIO_GETATTR:
 347                 /* Give the driver a chance to override */
 348                 if (dp->d_getattr != NULL) {
 349                         if (bp->bio_disk == NULL)
 350                                 bp->bio_disk = dp;
 351                         error = dp->d_getattr(bp);
 352                         if (error != -1)
 353                                 break;
 354                         error = EJUSTRETURN;
 355                 }
 356                 if (g_handleattr_int(bp, "GEOM::candelete",
 357                     (dp->d_flags & DISKFLAG_CANDELETE) != 0))
 358                         break;
 359                 else if (g_handleattr_int(bp, "GEOM::fwsectors",
 360                     dp->d_fwsectors))
 361                         break;
 362                 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
 363                         break;
 364                 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
 365                         break;
 366                 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident))
 367                         break;
 368                 else if (g_handleattr(bp, "GEOM::hba_vendor",
 369                     &dp->d_hba_vendor, 2))
 370                         break;
 371                 else if (g_handleattr(bp, "GEOM::hba_device",
 372                     &dp->d_hba_device, 2))
 373                         break;
 374                 else if (g_handleattr(bp, "GEOM::hba_subvendor",
 375                     &dp->d_hba_subvendor, 2))
 376                         break;
 377                 else if (g_handleattr(bp, "GEOM::hba_subdevice",
 378                     &dp->d_hba_subdevice, 2))
 379                         break;
 380                 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
 381                         g_disk_kerneldump(bp, dp);
 382                 else if (!strcmp(bp->bio_attribute, "GEOM::setstate"))
 383                         g_disk_setstate(bp, sc);
 384                 else
 385                         error = ENOIOCTL;
 386                 break;
 387         case BIO_FLUSH:
 388                 g_trace(G_T_BIO, "g_disk_flushcache(%s)",
 389                     bp->bio_to->name);
 390                 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) {
 391                         error = EOPNOTSUPP;
 392                         break;
 393                 }
 394                 bp2 = g_clone_bio(bp);
 395                 if (bp2 == NULL) {
 396                         g_io_deliver(bp, ENOMEM);
 397                         return;
 398                 }
 399                 bp2->bio_done = g_disk_done;
 400                 bp2->bio_disk = dp;
 401                 g_disk_lock_giant(dp);
 402                 dp->d_strategy(bp2);
 403                 g_disk_unlock_giant(dp);
 404                 break;
 405         default:
 406                 error = EOPNOTSUPP;
 407                 break;
 408         }
 409         if (error != EJUSTRETURN)
 410                 g_io_deliver(bp, error);
 411         return;
 412 }
 413
 414 static void
 415 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
 416 {
 417         struct bio *bp;
 418         struct disk *dp;
 419         struct g_disk_softc *sc;
 420         char *buf;
 421         int res = 0;
 422
 423         sc = gp->softc;
 424         if (sc == NULL || (dp = sc->dp) == NULL)
 425                 return;
 426         if (indent == NULL) {
 427                 sbuf_printf(sb, " hd %u", dp->d_fwheads);
 428                 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
 429                 return;
 430         }
 431         if (pp != NULL) {
 432                 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
 433                     indent, dp->d_fwheads);
 434                 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
 435                     indent, dp->d_fwsectors);
 436                 if (dp->d_getattr != NULL) {
 437                         buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK);
 438                         bp = g_alloc_bio();
 439                         bp->bio_disk = dp;
 440                         bp->bio_attribute = "GEOM::ident";
 441                         bp->bio_length = DISK_IDENT_SIZE;
 442                         bp->bio_data = buf;
 443                         res = dp->d_getattr(bp);
 444                         sbuf_printf(sb, "%s<ident>%s</ident>\n", indent,
 445                             res == 0 ? buf: dp->d_ident);
 446                         bp->bio_attribute = "GEOM::lunid";
 447                         bp->bio_length = DISK_IDENT_SIZE;
 448                         bp->bio_data = buf;
 449                         if (dp->d_getattr(bp) == 0)
 450                                 sbuf_printf(sb, "%s<lunid>%s</lunid>\n",
 451                                     indent, buf);
 452                         g_destroy_bio(bp);
 453                         g_free(buf);
 454                 } else
 455                         sbuf_printf(sb, "%s<ident>%s</ident>\n", indent,
 456                             dp->d_ident);
 457                 sbuf_printf(sb, "%s<descr>%s</descr>\n", indent, dp->d_descr);
 458         }
 459 }
 460
 461 static void
 462 g_disk_create(void *arg, int flag)
 463 {
 464         struct g_geom *gp;
 465         struct g_provider *pp;
 466         struct disk *dp;
 467         struct g_disk_softc *sc;
 468         char tmpstr[80];
 469
 470         if (flag == EV_CANCEL)
 471                 return;
 472         g_topology_assert();
 473         dp = arg;
 474         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
 475         mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF);
 476         sc->dp = dp;
 477         gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
 478         gp->softc = sc;
 479         pp = g_new_providerf(gp, "%s", gp->name);
 480         pp->mediasize = dp->d_mediasize;
 481         pp->sectorsize = dp->d_sectorsize;
 482         if (dp->d_flags & DISKFLAG_CANDELETE)
 483                 pp->flags |= G_PF_CANDELETE;
 484         pp->stripeoffset = dp->d_stripeoffset;
 485         pp->stripesize = dp->d_stripesize;
 486         if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0)
 487                 pp->flags |= G_PF_ACCEPT_UNMAPPED;
 488         if (bootverbose)
 489                 printf("GEOM: new disk %s\n", gp->name);
 490         sysctl_ctx_init(&sc->sysctl_ctx);
 491         snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name);
 492         sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
 493                 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name,
 494                 CTLFLAG_RD, 0, tmpstr);
 495         if (sc->sysctl_tree != NULL) {
 496                 snprintf(tmpstr, sizeof(tmpstr),
 497                     "kern.geom.disk.%s.led", gp->name);
 498                 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led));
 499                 SYSCTL_ADD_STRING(&sc->sysctl_ctx,
 500                     SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led",
 501                     CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led),
 502                     "LED name");
 503         }
 504         pp->private = sc;
 505         dp->d_geom = gp;
 506         g_error_provider(pp, 0);
 507 }
 508
 509 /*
 510  * We get this callback after all of the consumers have gone away, and just
 511  * before the provider is freed.  If the disk driver provided a d_gone
 512  * callback, let them know that it is okay to free resources -- they won't
 513  * be getting any more accesses from GEOM.
 514  */
 515 static void
 516 g_disk_providergone(struct g_provider *pp)
 517 {
 518         struct disk *dp;
 519         struct g_disk_softc *sc;
 520
 521         sc = (struct g_disk_softc *)pp->private;
 522         dp = sc->dp;
 523
 524         /*
 525          * FreeBSD 9 started with VERSION_01 of the struct disk structure.
 526          * However, g_gone was added in the middle of the branch.  To
 527          * cope with version being missing from struct disk, we set a flag
 528          * in g_disk_create for VERSION_01 and avoid touching the d_gone
 529          * field for old consumers.
 530          */
 531         if (dp != NULL && (dp->d_flags & DISKFLAG_LACKS_GONE) == 0 &&
 532             dp->d_gone != NULL)
 533                 dp->d_gone(dp);
 534         if (sc->sysctl_tree != NULL) {
 535                 sysctl_ctx_free(&sc->sysctl_ctx);
 536                 sc->sysctl_tree = NULL;
 537         }
 538         if (sc->led[0] != 0) {
 539                 led_set(sc->led, "0");
 540                 sc->led[0] = 0;
 541         }
 542         pp->private = NULL;
 543         pp->geom->softc = NULL;
 544         mtx_destroy(&sc->done_mtx);
 545         g_free(sc);
 546 }
 547
 548 static void
 549 g_disk_destroy(void *ptr, int flag)
 550 {
 551         struct disk *dp;
 552         struct g_geom *gp;
 553         struct g_disk_softc *sc;
 554
 555         g_topology_assert();
 556         dp = ptr;
 557         gp = dp->d_geom;
 558         if (gp != NULL) {
 559                 sc = gp->softc;
 560                 if (sc != NULL)
 561                         sc->dp = NULL;
 562                 dp->d_geom = NULL;
 563                 g_wither_geom(gp, ENXIO);
 564         }
 565         g_free(dp);
 566 }
 567
 568 /*
 569  * We only allow printable characters in disk ident,
 570  * the rest is converted to 'x<HH>'.
 571  */
 572 static void
 573 g_disk_ident_adjust(char *ident, size_t size)
 574 {
 575         char *p, tmp[4], newid[DISK_IDENT_SIZE];
 576
 577         newid[0] = '\0';
 578         for (p = ident; *p != '\0'; p++) {
 579                 if (isprint(*p)) {
 580                         tmp[0] = *p;
 581                         tmp[1] = '\0';
 582                 } else {
 583                         snprintf(tmp, sizeof(tmp), "x%02hhx",
 584                             *(unsigned char *)p);
 585                 }
 586                 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid))
 587                         break;
 588         }
 589         bzero(ident, size);
 590         strlcpy(ident, newid, size);
 591 }
 592
 593 struct disk *
 594 disk_alloc(void)
 595 {
 596
 597         return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO));
 598 }
 599
 600 void
 601 disk_create(struct disk *dp, int version)
 602 {
 603
 604         if (version != DISK_VERSION_02 && version != DISK_VERSION_01) {
 605                 printf("WARNING: Attempt to add disk %s%d %s",
 606                     dp->d_name, dp->d_unit,
 607                     " using incompatible ABI version of disk(9)\n");
 608                 printf("WARNING: Ignoring disk %s%d\n",
 609                     dp->d_name, dp->d_unit);
 610                 return;
 611         }
 612         if (version == DISK_VERSION_01)
 613                 dp->d_flags |= DISKFLAG_LACKS_GONE;
 614         KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
 615         KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
 616         KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
 617         KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
 618         if (dp->d_devstat == NULL)
 619                 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
 620                     dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
 621                     DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
 622         dp->d_geom = NULL;
 623         g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident));
 624         g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
 625 }
 626
 627 void
 628 disk_destroy(struct disk *dp)
 629 {
 630
 631         g_cancel_event(dp);
 632         dp->d_destroyed = 1;
 633         if (dp->d_devstat != NULL)
 634                 devstat_remove_entry(dp->d_devstat);
 635         g_post_event(g_disk_destroy, dp, M_WAITOK, NULL);
 636 }
 637
 638 void
 639 disk_gone(struct disk *dp)
 640 {
 641         struct g_geom *gp;
 642         struct g_provider *pp;
 643
 644         gp = dp->d_geom;
 645         if (gp != NULL) {
 646                 pp = LIST_FIRST(&gp->provider);
 647                 if (pp != NULL) {
 648                         KASSERT(LIST_NEXT(pp, provider) == NULL,
 649                             ("geom %p has more than one provider", gp));
 650                         g_wither_provider(pp, ENXIO);
 651                 }
 652         }
 653 }
 654
 655 void
 656 disk_attr_changed(struct disk *dp, const char *attr, int flag)
 657 {
 658         struct g_geom *gp;
 659         struct g_provider *pp;
 660
 661         gp = dp->d_geom;
 662         if (gp != NULL)
 663                 LIST_FOREACH(pp, &gp->provider, provider)
 664                         (void)g_attr_changed(pp, attr, flag);
 665 }
 666
 667 void
 668 disk_media_changed(struct disk *dp, int flag)
 669 {
 670         struct g_geom *gp;
 671         struct g_provider *pp;
 672
 673         gp = dp->d_geom;
 674         if (gp != NULL) {
 675                 pp = LIST_FIRST(&gp->provider);
 676                 if (pp != NULL) {
 677                         KASSERT(LIST_NEXT(pp, provider) == NULL,
 678                             ("geom %p has more than one provider", gp));
 679                         g_media_changed(pp, flag);
 680                 }
 681         }
 682 }
 683
 684 void
 685 disk_media_gone(struct disk *dp, int flag)
 686 {
 687         struct g_geom *gp;
 688         struct g_provider *pp;
 689
 690         gp = dp->d_geom;
 691         if (gp != NULL) {
 692                 pp = LIST_FIRST(&gp->provider);
 693                 if (pp != NULL) {
 694                         KASSERT(LIST_NEXT(pp, provider) == NULL,
 695                             ("geom %p has more than one provider", gp));
 696                         g_media_gone(pp, flag);
 697                 }
 698         }
 699 }
 700
 701 static void
 702 g_kern_disks(void *p, int flag __unused)
 703 {
 704         struct sbuf *sb;
 705         struct g_geom *gp;
 706         char *sp;
 707
 708         sb = p;
 709         sp = "";
 710         g_topology_assert();
 711         LIST_FOREACH(gp, &g_disk_class.geom, geom) {
 712                 sbuf_printf(sb, "%s%s", sp, gp->name);
 713                 sp = " ";
 714         }
 715         sbuf_finish(sb);
 716 }
 717
 718 static int
 719 sysctl_disks(SYSCTL_HANDLER_ARGS)
 720 {
 721         int error;
 722         struct sbuf *sb;
 723
 724         sb = sbuf_new_auto();
 725         g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
 726         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
 727         sbuf_delete(sb);
 728         return error;
 729 }
 730
 731 SYSCTL_PROC(_kern, OID_AUTO, disks,
 732     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 733     sysctl_disks, "A", "names of available disks");