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 = G_DISK_CLASS_NAME,
  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_maxsize == 0) {
 147                         printf("WARNING: Disk drive %s%d has no d_maxsize\n",
 148                             dp->d_name, dp->d_unit);
 149                         dp->d_maxsize = DFLTPHYS;
 150                 }
 151                 if (dp->d_flags & DISKFLAG_CANDELETE) {
 152                         if (bootverbose && dp->d_delmaxsize == 0) {
 153                                 printf("WARNING: Disk drive %s%d has no d_delmaxsize\n",
 154                                     dp->d_name, dp->d_unit);
 155                                 dp->d_delmaxsize = dp->d_maxsize;
 156                         }
 157                 } else {
 158                         dp->d_delmaxsize = 0;
 159                 }
 160                 pp->stripeoffset = dp->d_stripeoffset;
 161                 pp->stripesize = dp->d_stripesize;
 162                 dp->d_flags |= DISKFLAG_OPEN;
 163         } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
 164                 if (dp->d_close != NULL) {
 165                         g_disk_lock_giant(dp);
 166                         error = dp->d_close(dp);
 167                         if (error != 0)
 168                                 printf("Closed disk %s -> %d\n",
 169                                     pp->name, error);
 170                         g_disk_unlock_giant(dp);
 171                 }
 172                 sc->state = G_STATE_ACTIVE;
 173                 if (sc->led[0] != 0)
 174                         led_set(sc->led, "0");
 175                 dp->d_flags &= ~DISKFLAG_OPEN;
 176         }
 177         return (error);
 178 }
 179
 180 static void
 181 g_disk_kerneldump(struct bio *bp, struct disk *dp)
 182 {
 183         struct g_kerneldump *gkd;
 184         struct g_geom *gp;
 185
 186         gkd = (struct g_kerneldump*)bp->bio_data;
 187         gp = bp->bio_to->geom;
 188         g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)",
 189                 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
 190         if (dp->d_dump == NULL) {
 191                 g_io_deliver(bp, ENODEV);
 192                 return;
 193         }
 194         gkd->di.dumper = dp->d_dump;
 195         gkd->di.priv = dp;
 196         gkd->di.blocksize = dp->d_sectorsize;
 197         gkd->di.maxiosize = dp->d_maxsize;
 198         gkd->di.mediaoffset = gkd->offset;
 199         if ((gkd->offset + gkd->length) > dp->d_mediasize)
 200                 gkd->length = dp->d_mediasize - gkd->offset;
 201         gkd->di.mediasize = gkd->length;
 202         g_io_deliver(bp, 0);
 203 }
 204
 205 static void
 206 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc)
 207 {
 208         const char *cmd;
 209
 210         memcpy(&sc->state, bp->bio_data, sizeof(sc->state));
 211         if (sc->led[0] != 0) {
 212                 switch (sc->state) {
 213                 case G_STATE_FAILED:
 214                         cmd = "1";
 215                         break;
 216                 case G_STATE_REBUILD:
 217                         cmd = "f5";
 218                         break;
 219                 case G_STATE_RESYNC:
 220                         cmd = "f1";
 221                         break;
 222                 default:
 223                         cmd = "0";
 224                         break;
 225                 }
 226                 led_set(sc->led, cmd);
 227         }
 228         g_io_deliver(bp, 0);
 229 }
 230
 231 static void
 232 g_disk_done(struct bio *bp)
 233 {
 234         struct bio *bp2;
 235         struct g_disk_softc *sc;
 236
 237         /* See "notes" for why we need a mutex here */
 238         /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */
 239         bp2 = bp->bio_parent;
 240         sc = bp2->bio_to->private;
 241         bp->bio_completed = bp->bio_length - bp->bio_resid;
 242         mtx_lock(&sc->done_mtx);
 243         if (bp2->bio_error == 0)
 244                 bp2->bio_error = bp->bio_error;
 245         bp2->bio_completed += bp->bio_completed;
 246         if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) != 0)
 247                 devstat_end_transaction_bio(sc->dp->d_devstat, bp);
 248         g_destroy_bio(bp);
 249         bp2->bio_inbed++;
 250         if (bp2->bio_children == bp2->bio_inbed) {
 251                 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
 252                 g_io_deliver(bp2, bp2->bio_error);
 253         }
 254         mtx_unlock(&sc->done_mtx);
 255 }
 256
 257 static int
 258 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
 259 {
 260         struct disk *dp;
 261         struct g_disk_softc *sc;
 262         int error;
 263
 264         sc = pp->private;
 265         dp = sc->dp;
 266
 267         if (dp->d_ioctl == NULL)
 268                 return (ENOIOCTL);
 269         g_disk_lock_giant(dp);
 270         error = dp->d_ioctl(dp, cmd, data, fflag, td);
 271         g_disk_unlock_giant(dp);
 272         return (error);
 273 }
 274
 275 static void
 276 g_disk_start(struct bio *bp)
 277 {
 278         struct bio *bp2, *bp3;
 279         struct disk *dp;
 280         struct g_disk_softc *sc;
 281         int error;
 282         off_t off;
 283
 284         sc = bp->bio_to->private;
 285         if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
 286                 g_io_deliver(bp, ENXIO);
 287                 return;
 288         }
 289         error = EJUSTRETURN;
 290         switch(bp->bio_cmd) {
 291         case BIO_DELETE:
 292                 if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
 293                         error = EOPNOTSUPP;
 294                         break;
 295                 }
 296                 /* fall-through */
 297         case BIO_READ:
 298         case BIO_WRITE:
 299                 off = 0;
 300                 bp3 = NULL;
 301                 bp2 = g_clone_bio(bp);
 302                 if (bp2 == NULL) {
 303                         error = ENOMEM;
 304                         break;
 305                 }
 306                 do {
 307                         off_t d_maxsize;
 308
 309                         d_maxsize = (bp->bio_cmd == BIO_DELETE) ?
 310                             dp->d_delmaxsize : dp->d_maxsize;
 311                         bp2->bio_offset += off;
 312                         bp2->bio_length -= off;
 313                         if ((bp->bio_flags & BIO_UNMAPPED) == 0) {
 314                                 bp2->bio_data += off;
 315                         } else {
 316                                 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO)
 317                                     != 0,
 318                                     ("unmapped bio not supported by disk %s",
 319                                     dp->d_name));
 320                                 bp2->bio_ma += off / PAGE_SIZE;
 321                                 bp2->bio_ma_offset += off;
 322                                 bp2->bio_ma_offset %= PAGE_SIZE;
 323                                 bp2->bio_ma_n -= off / PAGE_SIZE;
 324                         }
 325                         if (bp2->bio_length > d_maxsize) {
 326                                 /*
 327                                  * XXX: If we have a stripesize we should really
 328                                  * use it here. Care should be taken in the delete
 329                                  * case if this is done as deletes can be very
 330                                  * sensitive to size given how they are processed.
 331                                  */
 332                                 bp2->bio_length = d_maxsize;
 333                                 if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
 334                                         bp2->bio_ma_n = howmany(
 335                                             bp2->bio_ma_offset +
 336                                             bp2->bio_length, PAGE_SIZE);
 337                                 }
 338                                 off += d_maxsize;
 339                                 /*
 340                                  * To avoid a race, we need to grab the next bio
 341                                  * before we schedule this one.  See "notes".
 342                                  */
 343                                 bp3 = g_clone_bio(bp);
 344                                 if (bp3 == NULL)
 345                                         bp->bio_error = ENOMEM;
 346                         }
 347                         bp2->bio_done = g_disk_done;
 348                         bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
 349                         bp2->bio_bcount = bp2->bio_length;
 350                         bp2->bio_disk = dp;
 351                         devstat_start_transaction_bio(dp->d_devstat, bp2);
 352                         g_disk_lock_giant(dp);
 353                         dp->d_strategy(bp2);
 354                         g_disk_unlock_giant(dp);
 355                         bp2 = bp3;
 356                         bp3 = NULL;
 357                 } while (bp2 != NULL);
 358                 break;
 359         case BIO_GETATTR:
 360                 /* Give the driver a chance to override */
 361                 if (dp->d_getattr != NULL) {
 362                         if (bp->bio_disk == NULL)
 363                                 bp->bio_disk = dp;
 364                         error = dp->d_getattr(bp);
 365                         if (error != -1)
 366                                 break;
 367                         error = EJUSTRETURN;
 368                 }
 369                 if (g_handleattr_int(bp, "GEOM::candelete",
 370                     (dp->d_flags & DISKFLAG_CANDELETE) != 0))
 371                         break;
 372                 else if (g_handleattr_int(bp, "GEOM::fwsectors",
 373                     dp->d_fwsectors))
 374                         break;
 375                 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
 376                         break;
 377                 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
 378                         break;
 379                 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident))
 380                         break;
 381                 else if (g_handleattr(bp, "GEOM::hba_vendor",
 382                     &dp->d_hba_vendor, 2))
 383                         break;
 384                 else if (g_handleattr(bp, "GEOM::hba_device",
 385                     &dp->d_hba_device, 2))
 386                         break;
 387                 else if (g_handleattr(bp, "GEOM::hba_subvendor",
 388                     &dp->d_hba_subvendor, 2))
 389                         break;
 390                 else if (g_handleattr(bp, "GEOM::hba_subdevice",
 391                     &dp->d_hba_subdevice, 2))
 392                         break;
 393                 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
 394                         g_disk_kerneldump(bp, dp);
 395                 else if (!strcmp(bp->bio_attribute, "GEOM::setstate"))
 396                         g_disk_setstate(bp, sc);
 397                 else
 398                         error = ENOIOCTL;
 399                 break;
 400         case BIO_FLUSH:
 401                 g_trace(G_T_BIO, "g_disk_flushcache(%s)",
 402                     bp->bio_to->name);
 403                 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) {
 404                         error = EOPNOTSUPP;
 405                         break;
 406                 }
 407                 bp2 = g_clone_bio(bp);
 408                 if (bp2 == NULL) {
 409                         g_io_deliver(bp, ENOMEM);
 410                         return;
 411                 }
 412                 bp2->bio_done = g_disk_done;
 413                 bp2->bio_disk = dp;
 414                 g_disk_lock_giant(dp);
 415                 dp->d_strategy(bp2);
 416                 g_disk_unlock_giant(dp);
 417                 break;
 418         default:
 419                 error = EOPNOTSUPP;
 420                 break;
 421         }
 422         if (error != EJUSTRETURN)
 423                 g_io_deliver(bp, error);
 424         return;
 425 }
 426
 427 static void
 428 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
 429 {
 430         struct bio *bp;
 431         struct disk *dp;
 432         struct g_disk_softc *sc;
 433         char *buf;
 434         int res = 0;
 435
 436         sc = gp->softc;
 437         if (sc == NULL || (dp = sc->dp) == NULL)
 438                 return;
 439         if (indent == NULL) {
 440                 sbuf_printf(sb, " hd %u", dp->d_fwheads);
 441                 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
 442                 return;
 443         }
 444         if (pp != NULL) {
 445                 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
 446                     indent, dp->d_fwheads);
 447                 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
 448                     indent, dp->d_fwsectors);
 449                 if (dp->d_getattr != NULL) {
 450                         buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK);
 451                         bp = g_alloc_bio();
 452                         bp->bio_disk = dp;
 453                         bp->bio_attribute = "GEOM::ident";
 454                         bp->bio_length = DISK_IDENT_SIZE;
 455                         bp->bio_data = buf;
 456                         res = dp->d_getattr(bp);
 457                         sbuf_printf(sb, "%s<ident>%s</ident>\n", indent,
 458                             res == 0 ? buf: dp->d_ident);
 459                         bp->bio_attribute = "GEOM::lunid";
 460                         bp->bio_length = DISK_IDENT_SIZE;
 461                         bp->bio_data = buf;
 462                         if (dp->d_getattr(bp) == 0)
 463                                 sbuf_printf(sb, "%s<lunid>%s</lunid>\n",
 464                                     indent, buf);
 465                         g_destroy_bio(bp);
 466                         g_free(buf);
 467                 } else
 468                         sbuf_printf(sb, "%s<ident>%s</ident>\n", indent,
 469                             dp->d_ident);
 470                 sbuf_printf(sb, "%s<descr>%s</descr>\n", indent, dp->d_descr);
 471         }
 472 }
 473
 474 static void
 475 g_disk_resize(void *ptr, int flag)
 476 {
 477         struct disk *dp;
 478         struct g_geom *gp;
 479         struct g_provider *pp;
 480
 481         if (flag == EV_CANCEL)
 482                 return;
 483         g_topology_assert();
 484
 485         dp = ptr;
 486         gp = dp->d_geom;
 487
 488         if (dp->d_destroyed || gp == NULL)
 489                 return;
 490
 491         LIST_FOREACH(pp, &gp->provider, provider) {
 492                 if (pp->sectorsize != 0 &&
 493                     pp->sectorsize != dp->d_sectorsize)
 494                         g_wither_provider(pp, ENXIO);
 495                 else
 496                         g_resize_provider(pp, dp->d_mediasize);
 497         }
 498 }
 499
 500 static void
 501 g_disk_create(void *arg, int flag)
 502 {
 503         struct g_geom *gp;
 504         struct g_provider *pp;
 505         struct disk *dp;
 506         struct g_disk_softc *sc;
 507         char tmpstr[80];
 508
 509         if (flag == EV_CANCEL)
 510                 return;
 511         g_topology_assert();
 512         dp = arg;
 513         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
 514         mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF);
 515         sc->dp = dp;
 516         gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
 517         gp->softc = sc;
 518         pp = g_new_providerf(gp, "%s", gp->name);
 519         pp->mediasize = dp->d_mediasize;
 520         pp->sectorsize = dp->d_sectorsize;
 521         pp->stripeoffset = dp->d_stripeoffset;
 522         pp->stripesize = dp->d_stripesize;
 523         if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0)
 524                 pp->flags |= G_PF_ACCEPT_UNMAPPED;
 525         if (bootverbose)
 526                 printf("GEOM: new disk %s\n", gp->name);
 527         sysctl_ctx_init(&sc->sysctl_ctx);
 528         snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name);
 529         sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
 530                 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name,
 531                 CTLFLAG_RD, 0, tmpstr);
 532         if (sc->sysctl_tree != NULL) {
 533                 snprintf(tmpstr, sizeof(tmpstr),
 534                     "kern.geom.disk.%s.led", gp->name);
 535                 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led));
 536                 SYSCTL_ADD_STRING(&sc->sysctl_ctx,
 537                     SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led",
 538                     CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led),
 539                     "LED name");
 540         }
 541         pp->private = sc;
 542         dp->d_geom = gp;
 543         g_error_provider(pp, 0);
 544 }
 545
 546 /*
 547  * We get this callback after all of the consumers have gone away, and just
 548  * before the provider is freed.  If the disk driver provided a d_gone
 549  * callback, let them know that it is okay to free resources -- they won't
 550  * be getting any more accesses from GEOM.
 551  */
 552 static void
 553 g_disk_providergone(struct g_provider *pp)
 554 {
 555         struct disk *dp;
 556         struct g_disk_softc *sc;
 557
 558         sc = (struct g_disk_softc *)pp->private;
 559         dp = sc->dp;
 560         if (dp != NULL && dp->d_gone != NULL)
 561                 dp->d_gone(dp);
 562         if (sc->sysctl_tree != NULL) {
 563                 sysctl_ctx_free(&sc->sysctl_ctx);
 564                 sc->sysctl_tree = NULL;
 565         }
 566         if (sc->led[0] != 0) {
 567                 led_set(sc->led, "0");
 568                 sc->led[0] = 0;
 569         }
 570         pp->private = NULL;
 571         pp->geom->softc = NULL;
 572         mtx_destroy(&sc->done_mtx);
 573         g_free(sc);
 574 }
 575
 576 static void
 577 g_disk_destroy(void *ptr, int flag)
 578 {
 579         struct disk *dp;
 580         struct g_geom *gp;
 581         struct g_disk_softc *sc;
 582
 583         g_topology_assert();
 584         dp = ptr;
 585         gp = dp->d_geom;
 586         if (gp != NULL) {
 587                 sc = gp->softc;
 588                 if (sc != NULL)
 589                         sc->dp = NULL;
 590                 dp->d_geom = NULL;
 591                 g_wither_geom(gp, ENXIO);
 592         }
 593         g_free(dp);
 594 }
 595
 596 /*
 597  * We only allow printable characters in disk ident,
 598  * the rest is converted to 'x<HH>'.
 599  */
 600 static void
 601 g_disk_ident_adjust(char *ident, size_t size)
 602 {
 603         char *p, tmp[4], newid[DISK_IDENT_SIZE];
 604
 605         newid[0] = '\0';
 606         for (p = ident; *p != '\0'; p++) {
 607                 if (isprint(*p)) {
 608                         tmp[0] = *p;
 609                         tmp[1] = '\0';
 610                 } else {
 611                         snprintf(tmp, sizeof(tmp), "x%02hhx",
 612                             *(unsigned char *)p);
 613                 }
 614                 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid))
 615                         break;
 616         }
 617         bzero(ident, size);
 618         strlcpy(ident, newid, size);
 619 }
 620
 621 struct disk *
 622 disk_alloc(void)
 623 {
 624
 625         return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO));
 626 }
 627
 628 void
 629 disk_create(struct disk *dp, int version)
 630 {
 631
 632         if (version != DISK_VERSION_02) {
 633                 printf("WARNING: Attempt to add disk %s%d %s",
 634                     dp->d_name, dp->d_unit,
 635                     " using incompatible ABI version of disk(9)\n");
 636                 printf("WARNING: Ignoring disk %s%d\n",
 637                     dp->d_name, dp->d_unit);
 638                 return;
 639         }
 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 int
 728 disk_resize(struct disk *dp, int flag)
 729 {
 730
 731         if (dp->d_destroyed || dp->d_geom == NULL)
 732                 return (0);
 733
 734         return (g_post_event(g_disk_resize, dp, flag, NULL));
 735 }
 736
 737 static void
 738 g_kern_disks(void *p, int flag __unused)
 739 {
 740         struct sbuf *sb;
 741         struct g_geom *gp;
 742         char *sp;
 743
 744         sb = p;
 745         sp = "";
 746         g_topology_assert();
 747         LIST_FOREACH(gp, &g_disk_class.geom, geom) {
 748                 sbuf_printf(sb, "%s%s", sp, gp->name);
 749                 sp = " ";
 750         }
 751         sbuf_finish(sb);
 752 }
 753
 754 static int
 755 sysctl_disks(SYSCTL_HANDLER_ARGS)
 756 {
 757         int error;
 758         struct sbuf *sb;
 759
 760         sb = sbuf_new_auto();
 761         g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
 762         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
 763         sbuf_delete(sb);
 764         return error;
 765 }
 766
 767 SYSCTL_PROC(_kern, OID_AUTO, disks,
 768     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 769     sysctl_disks, "A", "names of available disks");