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/devicestat.h>
  51 #include <machine/md_var.h>
  52
  53 #include <sys/lock.h>
  54 #include <sys/mutex.h>
  55 #include <geom/geom.h>
  56 #include <geom/geom_disk.h>
  57 #include <geom/geom_int.h>
  58
  59 #include <dev/led/led.h>
  60
  61 struct g_disk_softc {
  62         struct mtx               done_mtx;
  63         struct disk             *dp;
  64         struct sysctl_ctx_list  sysctl_ctx;
  65         struct sysctl_oid       *sysctl_tree;
  66         char                    led[64];
  67         uint32_t                state;
  68         struct mtx               start_mtx;
  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 int
  94 g_disk_access(struct g_provider *pp, int r, int w, int e)
  95 {
  96         struct disk *dp;
  97         struct g_disk_softc *sc;
  98         int error;
  99
 100         g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
 101             pp->name, r, w, e);
 102         g_topology_assert();
 103         sc = pp->private;
 104         if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
 105                 /*
 106                  * Allow decreasing access count even if disk is not
 107                  * avaliable anymore.
 108                  */
 109                 if (r <= 0 && w <= 0 && e <= 0)
 110                         return (0);
 111                 return (ENXIO);
 112         }
 113         r += pp->acr;
 114         w += pp->acw;
 115         e += pp->ace;
 116         error = 0;
 117         if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
 118                 if (dp->d_open != NULL) {
 119                         error = dp->d_open(dp);
 120                         if (bootverbose && error != 0)
 121                                 printf("Opened disk %s -> %d\n",
 122                                     pp->name, error);
 123                         if (error != 0)
 124                                 return (error);
 125                 }
 126                 pp->mediasize = dp->d_mediasize;
 127                 pp->sectorsize = dp->d_sectorsize;
 128                 if (dp->d_maxsize == 0) {
 129                         printf("WARNING: Disk drive %s%d has no d_maxsize\n",
 130                             dp->d_name, dp->d_unit);
 131                         dp->d_maxsize = DFLTPHYS;
 132                 }
 133                 if (dp->d_delmaxsize == 0) {
 134                         if (bootverbose && dp->d_flags & DISKFLAG_CANDELETE) {
 135                                 printf("WARNING: Disk drive %s%d has no "
 136                                     "d_delmaxsize\n", dp->d_name, dp->d_unit);
 137                         }
 138                         dp->d_delmaxsize = dp->d_maxsize;
 139                 }
 140                 pp->stripeoffset = dp->d_stripeoffset;
 141                 pp->stripesize = dp->d_stripesize;
 142                 dp->d_flags |= DISKFLAG_OPEN;
 143         } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
 144                 if (dp->d_close != NULL) {
 145                         error = dp->d_close(dp);
 146                         if (error != 0)
 147                                 printf("Closed disk %s -> %d\n",
 148                                     pp->name, error);
 149                 }
 150                 sc->state = G_STATE_ACTIVE;
 151                 if (sc->led[0] != 0)
 152                         led_set(sc->led, "0");
 153                 dp->d_flags &= ~DISKFLAG_OPEN;
 154         }
 155         return (error);
 156 }
 157
 158 static void
 159 g_disk_kerneldump(struct bio *bp, struct disk *dp)
 160 {
 161         struct g_kerneldump *gkd;
 162         struct g_geom *gp;
 163
 164         gkd = (struct g_kerneldump*)bp->bio_data;
 165         gp = bp->bio_to->geom;
 166         g_trace(G_T_TOPOLOGY, "g_disk_kerneldump(%s, %jd, %jd)",
 167                 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
 168         if (dp->d_dump == NULL) {
 169                 g_io_deliver(bp, ENODEV);
 170                 return;
 171         }
 172         gkd->di.dumper = dp->d_dump;
 173         gkd->di.priv = dp;
 174         gkd->di.blocksize = dp->d_sectorsize;
 175         gkd->di.maxiosize = dp->d_maxsize;
 176         gkd->di.mediaoffset = gkd->offset;
 177         if ((gkd->offset + gkd->length) > dp->d_mediasize)
 178                 gkd->length = dp->d_mediasize - gkd->offset;
 179         gkd->di.mediasize = gkd->length;
 180         g_io_deliver(bp, 0);
 181 }
 182
 183 static void
 184 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc)
 185 {
 186         const char *cmd;
 187
 188         memcpy(&sc->state, bp->bio_data, sizeof(sc->state));
 189         if (sc->led[0] != 0) {
 190                 switch (sc->state) {
 191                 case G_STATE_FAILED:
 192                         cmd = "1";
 193                         break;
 194                 case G_STATE_REBUILD:
 195                         cmd = "f5";
 196                         break;
 197                 case G_STATE_RESYNC:
 198                         cmd = "f1";
 199                         break;
 200                 default:
 201                         cmd = "0";
 202                         break;
 203                 }
 204                 led_set(sc->led, cmd);
 205         }
 206         g_io_deliver(bp, 0);
 207 }
 208
 209 static void
 210 g_disk_done(struct bio *bp)
 211 {
 212         struct bintime now;
 213         struct bio *bp2;
 214         struct g_disk_softc *sc;
 215
 216         /* See "notes" for why we need a mutex here */
 217         /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */
 218         bp2 = bp->bio_parent;
 219         sc = bp2->bio_to->private;
 220         bp->bio_completed = bp->bio_length - bp->bio_resid;
 221         binuptime(&now);
 222         mtx_lock(&sc->done_mtx);
 223         if (bp2->bio_error == 0)
 224                 bp2->bio_error = bp->bio_error;
 225         bp2->bio_completed += bp->bio_completed;
 226         if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE|BIO_FLUSH)) != 0)
 227                 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now);
 228         bp2->bio_inbed++;
 229         if (bp2->bio_children == bp2->bio_inbed) {
 230                 mtx_unlock(&sc->done_mtx);
 231                 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
 232                 g_io_deliver(bp2, bp2->bio_error);
 233         } else
 234                 mtx_unlock(&sc->done_mtx);
 235         g_destroy_bio(bp);
 236 }
 237
 238 static int
 239 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
 240 {
 241         struct disk *dp;
 242         struct g_disk_softc *sc;
 243         int error;
 244
 245         sc = pp->private;
 246         dp = sc->dp;
 247
 248         if (dp->d_ioctl == NULL)
 249                 return (ENOIOCTL);
 250         error = dp->d_ioctl(dp, cmd, data, fflag, td);
 251         return (error);
 252 }
 253
 254 static void
 255 g_disk_start(struct bio *bp)
 256 {
 257         struct bio *bp2, *bp3;
 258         struct disk *dp;
 259         struct g_disk_softc *sc;
 260         int error;
 261         off_t off;
 262
 263         sc = bp->bio_to->private;
 264         if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
 265                 g_io_deliver(bp, ENXIO);
 266                 return;
 267         }
 268         error = EJUSTRETURN;
 269         switch(bp->bio_cmd) {
 270         case BIO_DELETE:
 271                 if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
 272                         error = EOPNOTSUPP;
 273                         break;
 274                 }
 275                 /* fall-through */
 276         case BIO_READ:
 277         case BIO_WRITE:
 278                 off = 0;
 279                 bp3 = NULL;
 280                 bp2 = g_clone_bio(bp);
 281                 if (bp2 == NULL) {
 282                         error = ENOMEM;
 283                         break;
 284                 }
 285                 do {
 286                         off_t d_maxsize;
 287
 288                         d_maxsize = (bp->bio_cmd == BIO_DELETE) ?
 289                             dp->d_delmaxsize : dp->d_maxsize;
 290                         bp2->bio_offset += off;
 291                         bp2->bio_length -= off;
 292                         if ((bp->bio_flags & BIO_UNMAPPED) == 0) {
 293                                 bp2->bio_data += off;
 294                         } else {
 295                                 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO)
 296                                     != 0,
 297                                     ("unmapped bio not supported by disk %s",
 298                                     dp->d_name));
 299                                 bp2->bio_ma += off / PAGE_SIZE;
 300                                 bp2->bio_ma_offset += off;
 301                                 bp2->bio_ma_offset %= PAGE_SIZE;
 302                                 bp2->bio_ma_n -= off / PAGE_SIZE;
 303                         }
 304                         if (bp2->bio_length > d_maxsize) {
 305                                 /*
 306                                  * XXX: If we have a stripesize we should really
 307                                  * use it here. Care should be taken in the delete
 308                                  * case if this is done as deletes can be very
 309                                  * sensitive to size given how they are processed.
 310                                  */
 311                                 bp2->bio_length = d_maxsize;
 312                                 if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
 313                                         bp2->bio_ma_n = howmany(
 314                                             bp2->bio_ma_offset +
 315                                             bp2->bio_length, PAGE_SIZE);
 316                                 }
 317                                 off += d_maxsize;
 318                                 /*
 319                                  * To avoid a race, we need to grab the next bio
 320                                  * before we schedule this one.  See "notes".
 321                                  */
 322                                 bp3 = g_clone_bio(bp);
 323                                 if (bp3 == NULL)
 324                                         bp->bio_error = ENOMEM;
 325                         }
 326                         bp2->bio_done = g_disk_done;
 327                         bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
 328                         bp2->bio_bcount = bp2->bio_length;
 329                         bp2->bio_disk = dp;
 330                         mtx_lock(&sc->start_mtx);
 331                         devstat_start_transaction_bio(dp->d_devstat, bp2);
 332                         mtx_unlock(&sc->start_mtx);
 333                         dp->d_strategy(bp2);
 334                         bp2 = bp3;
 335                         bp3 = NULL;
 336                 } while (bp2 != NULL);
 337                 break;
 338         case BIO_GETATTR:
 339                 /* Give the driver a chance to override */
 340                 if (dp->d_getattr != NULL) {
 341                         if (bp->bio_disk == NULL)
 342                                 bp->bio_disk = dp;
 343                         error = dp->d_getattr(bp);
 344                         if (error != -1)
 345                                 break;
 346                         error = EJUSTRETURN;
 347                 }
 348                 if (g_handleattr_int(bp, "GEOM::candelete",
 349                     (dp->d_flags & DISKFLAG_CANDELETE) != 0))
 350                         break;
 351                 else if (g_handleattr_int(bp, "GEOM::fwsectors",
 352                     dp->d_fwsectors))
 353                         break;
 354                 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
 355                         break;
 356                 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
 357                         break;
 358                 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident))
 359                         break;
 360                 else if (g_handleattr_uint16_t(bp, "GEOM::hba_vendor",
 361                     dp->d_hba_vendor))
 362                         break;
 363                 else if (g_handleattr_uint16_t(bp, "GEOM::hba_device",
 364                     dp->d_hba_device))
 365                         break;
 366                 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subvendor",
 367                     dp->d_hba_subvendor))
 368                         break;
 369                 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subdevice",
 370                     dp->d_hba_subdevice))
 371                         break;
 372                 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
 373                         g_disk_kerneldump(bp, dp);
 374                 else if (!strcmp(bp->bio_attribute, "GEOM::setstate"))
 375                         g_disk_setstate(bp, sc);
 376                 else if (g_handleattr_uint16_t(bp, "GEOM::rotation_rate",
 377                     dp->d_rotation_rate))
 378                         break;
 379                 else
 380                         error = ENOIOCTL;
 381                 break;
 382         case BIO_FLUSH:
 383                 g_trace(G_T_BIO, "g_disk_flushcache(%s)",
 384                     bp->bio_to->name);
 385                 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) {
 386                         error = EOPNOTSUPP;
 387                         break;
 388                 }
 389                 bp2 = g_clone_bio(bp);
 390                 if (bp2 == NULL) {
 391                         g_io_deliver(bp, ENOMEM);
 392                         return;
 393                 }
 394                 bp2->bio_done = g_disk_done;
 395                 bp2->bio_disk = dp;
 396                 mtx_lock(&sc->start_mtx);
 397                 devstat_start_transaction_bio(dp->d_devstat, bp2);
 398                 mtx_unlock(&sc->start_mtx);
 399                 dp->d_strategy(bp2);
 400                 break;
 401         default:
 402                 error = EOPNOTSUPP;
 403                 break;
 404         }
 405         if (error != EJUSTRETURN)
 406                 g_io_deliver(bp, error);
 407         return;
 408 }
 409
 410 static void
 411 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
 412 {
 413         struct bio *bp;
 414         struct disk *dp;
 415         struct g_disk_softc *sc;
 416         char *buf;
 417         int res = 0;
 418
 419         sc = gp->softc;
 420         if (sc == NULL || (dp = sc->dp) == NULL)
 421                 return;
 422         if (indent == NULL) {
 423                 sbuf_printf(sb, " hd %u", dp->d_fwheads);
 424                 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
 425                 return;
 426         }
 427         if (pp != NULL) {
 428                 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
 429                     indent, dp->d_fwheads);
 430                 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
 431                     indent, dp->d_fwsectors);
 432                 if (dp->d_getattr != NULL) {
 433                         buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK);
 434                         bp = g_alloc_bio();
 435                         bp->bio_disk = dp;
 436                         bp->bio_attribute = "GEOM::ident";
 437                         bp->bio_length = DISK_IDENT_SIZE;
 438                         bp->bio_data = buf;
 439                         res = dp->d_getattr(bp);
 440                         sbuf_printf(sb, "%s<ident>", indent);
 441                         g_conf_printf_escaped(sb, "%s",
 442                             res == 0 ? buf: dp->d_ident);
 443                         sbuf_printf(sb, "</ident>\n");
 444                         bp->bio_attribute = "GEOM::lunid";
 445                         bp->bio_length = DISK_IDENT_SIZE;
 446                         bp->bio_data = buf;
 447                         if (dp->d_getattr(bp) == 0) {
 448                                 sbuf_printf(sb, "%s<lunid>", indent);
 449                                 g_conf_printf_escaped(sb, "%s", buf);
 450                                 sbuf_printf(sb, "</lunid>\n");
 451                         }
 452                         bp->bio_attribute = "GEOM::lunname";
 453                         bp->bio_length = DISK_IDENT_SIZE;
 454                         bp->bio_data = buf;
 455                         if (dp->d_getattr(bp) == 0) {
 456                                 sbuf_printf(sb, "%s<lunname>", indent);
 457                                 g_conf_printf_escaped(sb, "%s", buf);
 458                                 sbuf_printf(sb, "</lunname>\n");
 459                         }
 460                         g_destroy_bio(bp);
 461                         g_free(buf);
 462                 } else {
 463                         sbuf_printf(sb, "%s<ident>", indent);
 464                         g_conf_printf_escaped(sb, "%s", dp->d_ident);
 465                         sbuf_printf(sb, "</ident>\n");
 466                 }
 467                 sbuf_printf(sb, "%s<descr>", indent);
 468                 g_conf_printf_escaped(sb, "%s", dp->d_descr);
 469                 sbuf_printf(sb, "</descr>\n");
 470         }
 471 }
 472
 473 static void
 474 g_disk_resize(void *ptr, int flag)
 475 {
 476         struct disk *dp;
 477         struct g_geom *gp;
 478         struct g_provider *pp;
 479
 480         if (flag == EV_CANCEL)
 481                 return;
 482         g_topology_assert();
 483
 484         dp = ptr;
 485         gp = dp->d_geom;
 486
 487         if (dp->d_destroyed || gp == NULL)
 488                 return;
 489
 490         LIST_FOREACH(pp, &gp->provider, provider) {
 491                 if (pp->sectorsize != 0 &&
 492                     pp->sectorsize != dp->d_sectorsize)
 493                         g_wither_provider(pp, ENXIO);
 494                 else
 495                         g_resize_provider(pp, dp->d_mediasize);
 496         }
 497 }
 498
 499 static void
 500 g_disk_create(void *arg, int flag)
 501 {
 502         struct g_geom *gp;
 503         struct g_provider *pp;
 504         struct disk *dp;
 505         struct g_disk_softc *sc;
 506         char tmpstr[80];
 507
 508         if (flag == EV_CANCEL)
 509                 return;
 510         g_topology_assert();
 511         dp = arg;
 512         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
 513         mtx_init(&sc->start_mtx, "g_disk_start", NULL, MTX_DEF);
 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         devstat_remove_entry(pp->stat);
 520         pp->stat = NULL;
 521         dp->d_devstat->id = pp;
 522         pp->mediasize = dp->d_mediasize;
 523         pp->sectorsize = dp->d_sectorsize;
 524         pp->stripeoffset = dp->d_stripeoffset;
 525         pp->stripesize = dp->d_stripesize;
 526         if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0)
 527                 pp->flags |= G_PF_ACCEPT_UNMAPPED;
 528         if ((dp->d_flags & DISKFLAG_DIRECT_COMPLETION) != 0)
 529                 pp->flags |= G_PF_DIRECT_SEND;
 530         pp->flags |= G_PF_DIRECT_RECEIVE;
 531         if (bootverbose)
 532                 printf("GEOM: new disk %s\n", gp->name);
 533         sysctl_ctx_init(&sc->sysctl_ctx);
 534         snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name);
 535         sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
 536                 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name,
 537                 CTLFLAG_RD, 0, tmpstr);
 538         if (sc->sysctl_tree != NULL) {
 539                 SYSCTL_ADD_STRING(&sc->sysctl_ctx,
 540                     SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led",
 541                     CTLFLAG_RWTUN, sc->led, sizeof(sc->led),
 542                     "LED name");
 543         }
 544         pp->private = sc;
 545         dp->d_geom = gp;
 546         g_error_provider(pp, 0);
 547 }
 548
 549 /*
 550  * We get this callback after all of the consumers have gone away, and just
 551  * before the provider is freed.  If the disk driver provided a d_gone
 552  * callback, let them know that it is okay to free resources -- they won't
 553  * be getting any more accesses from GEOM.
 554  */
 555 static void
 556 g_disk_providergone(struct g_provider *pp)
 557 {
 558         struct disk *dp;
 559         struct g_disk_softc *sc;
 560
 561         sc = (struct g_disk_softc *)pp->private;
 562         dp = sc->dp;
 563         if (dp != NULL && dp->d_gone != NULL)
 564                 dp->d_gone(dp);
 565         if (sc->sysctl_tree != NULL) {
 566                 sysctl_ctx_free(&sc->sysctl_ctx);
 567                 sc->sysctl_tree = NULL;
 568         }
 569         if (sc->led[0] != 0) {
 570                 led_set(sc->led, "0");
 571                 sc->led[0] = 0;
 572         }
 573         pp->private = NULL;
 574         pp->geom->softc = NULL;
 575         mtx_destroy(&sc->done_mtx);
 576         mtx_destroy(&sc->start_mtx);
 577         g_free(sc);
 578 }
 579
 580 static void
 581 g_disk_destroy(void *ptr, int flag)
 582 {
 583         struct disk *dp;
 584         struct g_geom *gp;
 585         struct g_disk_softc *sc;
 586
 587         g_topology_assert();
 588         dp = ptr;
 589         gp = dp->d_geom;
 590         if (gp != NULL) {
 591                 sc = gp->softc;
 592                 if (sc != NULL)
 593                         sc->dp = NULL;
 594                 dp->d_geom = NULL;
 595                 g_wither_geom(gp, ENXIO);
 596         }
 597         g_free(dp);
 598 }
 599
 600 /*
 601  * We only allow printable characters in disk ident,
 602  * the rest is converted to 'x<HH>'.
 603  */
 604 static void
 605 g_disk_ident_adjust(char *ident, size_t size)
 606 {
 607         char *p, tmp[4], newid[DISK_IDENT_SIZE];
 608
 609         newid[0] = '\0';
 610         for (p = ident; *p != '\0'; p++) {
 611                 if (isprint(*p)) {
 612                         tmp[0] = *p;
 613                         tmp[1] = '\0';
 614                 } else {
 615                         snprintf(tmp, sizeof(tmp), "x%02hhx",
 616                             *(unsigned char *)p);
 617                 }
 618                 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid))
 619                         break;
 620         }
 621         bzero(ident, size);
 622         strlcpy(ident, newid, size);
 623 }
 624
 625 struct disk *
 626 disk_alloc(void)
 627 {
 628
 629         return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO));
 630 }
 631
 632 void
 633 disk_create(struct disk *dp, int version)
 634 {
 635
 636         if (version != DISK_VERSION) {
 637                 printf("WARNING: Attempt to add disk %s%d %s",
 638                     dp->d_name, dp->d_unit,
 639                     " using incompatible ABI version of disk(9)\n");
 640                 printf("WARNING: Ignoring disk %s%d\n",
 641                     dp->d_name, dp->d_unit);
 642                 return;
 643         }
 644         if (dp->d_flags & DISKFLAG_RESERVED) {
 645                 printf("WARNING: Attempt to add non-MPSAFE disk %s%d\n",
 646                     dp->d_name, dp->d_unit);
 647                 printf("WARNING: Ignoring disk %s%d\n",
 648                     dp->d_name, dp->d_unit);
 649                 return;
 650         }
 651         KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
 652         KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
 653         KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
 654         KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
 655         if (dp->d_devstat == NULL)
 656                 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
 657                     dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
 658                     DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
 659         dp->d_geom = NULL;
 660         g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident));
 661         g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
 662 }
 663
 664 void
 665 disk_destroy(struct disk *dp)
 666 {
 667
 668         g_cancel_event(dp);
 669         dp->d_destroyed = 1;
 670         if (dp->d_devstat != NULL)
 671                 devstat_remove_entry(dp->d_devstat);
 672         g_post_event(g_disk_destroy, dp, M_WAITOK, NULL);
 673 }
 674
 675 void
 676 disk_gone(struct disk *dp)
 677 {
 678         struct g_geom *gp;
 679         struct g_provider *pp;
 680
 681         gp = dp->d_geom;
 682         if (gp != NULL) {
 683                 pp = LIST_FIRST(&gp->provider);
 684                 if (pp != NULL) {
 685                         KASSERT(LIST_NEXT(pp, provider) == NULL,
 686                             ("geom %p has more than one provider", gp));
 687                         g_wither_provider(pp, ENXIO);
 688                 }
 689         }
 690 }
 691
 692 void
 693 disk_attr_changed(struct disk *dp, const char *attr, int flag)
 694 {
 695         struct g_geom *gp;
 696         struct g_provider *pp;
 697
 698         gp = dp->d_geom;
 699         if (gp != NULL)
 700                 LIST_FOREACH(pp, &gp->provider, provider)
 701                         (void)g_attr_changed(pp, attr, flag);
 702 }
 703
 704 void
 705 disk_media_changed(struct disk *dp, int flag)
 706 {
 707         struct g_geom *gp;
 708         struct g_provider *pp;
 709
 710         gp = dp->d_geom;
 711         if (gp != NULL) {
 712                 pp = LIST_FIRST(&gp->provider);
 713                 if (pp != NULL) {
 714                         KASSERT(LIST_NEXT(pp, provider) == NULL,
 715                             ("geom %p has more than one provider", gp));
 716                         g_media_changed(pp, flag);
 717                 }
 718         }
 719 }
 720
 721 void
 722 disk_media_gone(struct disk *dp, int flag)
 723 {
 724         struct g_geom *gp;
 725         struct g_provider *pp;
 726
 727         gp = dp->d_geom;
 728         if (gp != NULL) {
 729                 pp = LIST_FIRST(&gp->provider);
 730                 if (pp != NULL) {
 731                         KASSERT(LIST_NEXT(pp, provider) == NULL,
 732                             ("geom %p has more than one provider", gp));
 733                         g_media_gone(pp, flag);
 734                 }
 735         }
 736 }
 737
 738 int
 739 disk_resize(struct disk *dp, int flag)
 740 {
 741
 742         if (dp->d_destroyed || dp->d_geom == NULL)
 743                 return (0);
 744
 745         return (g_post_event(g_disk_resize, dp, flag, NULL));
 746 }
 747
 748 static void
 749 g_kern_disks(void *p, int flag __unused)
 750 {
 751         struct sbuf *sb;
 752         struct g_geom *gp;
 753         char *sp;
 754
 755         sb = p;
 756         sp = "";
 757         g_topology_assert();
 758         LIST_FOREACH(gp, &g_disk_class.geom, geom) {
 759                 sbuf_printf(sb, "%s%s", sp, gp->name);
 760                 sp = " ";
 761         }
 762         sbuf_finish(sb);
 763 }
 764
 765 static int
 766 sysctl_disks(SYSCTL_HANDLER_ARGS)
 767 {
 768         int error;
 769         struct sbuf *sb;
 770
 771         sb = sbuf_new_auto();
 772         g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
 773         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
 774         sbuf_delete(sb);
 775         return error;
 776 }
 777
 778 SYSCTL_PROC(_kern, OID_AUTO, disks,
 779     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 780     sysctl_disks, "A", "names of available disks");