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