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         struct mtx               start_mtx;
  70 };
  71
  72 static g_access_t g_disk_access;
  73 static g_start_t g_disk_start;
  74 static g_ioctl_t g_disk_ioctl;
  75 static g_dumpconf_t g_disk_dumpconf;
  76 static g_provgone_t g_disk_providergone;
  77
  78 static struct g_class g_disk_class = {
  79         .name = G_DISK_CLASS_NAME,
  80         .version = G_VERSION,
  81         .start = g_disk_start,
  82         .access = g_disk_access,
  83         .ioctl = g_disk_ioctl,
  84         .providergone = g_disk_providergone,
  85         .dumpconf = g_disk_dumpconf,
  86 };
  87
  88 SYSCTL_DECL(_kern_geom);
  89 static SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0,
  90     "GEOM_DISK stuff");
  91
  92 DECLARE_GEOM_CLASS(g_disk_class, g_disk);
  93
  94 static void __inline
  95 g_disk_lock_giant(struct disk *dp)
  96 {
  97
  98         if (dp->d_flags & DISKFLAG_NEEDSGIANT)
  99                 mtx_lock(&Giant);
 100 }
 101
 102 static void __inline
 103 g_disk_unlock_giant(struct disk *dp)
 104 {
 105
 106         if (dp->d_flags & DISKFLAG_NEEDSGIANT)
 107                 mtx_unlock(&Giant);
 108 }
 109
 110 static int
 111 g_disk_access(struct g_provider *pp, int r, int w, int e)
 112 {
 113         struct disk *dp;
 114         struct g_disk_softc *sc;
 115         int error;
 116
 117         g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
 118             pp->name, r, w, e);
 119         g_topology_assert();
 120         sc = pp->private;
 121         if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
 122                 /*
 123                  * Allow decreasing access count even if disk is not
 124                  * avaliable anymore.
 125                  */
 126                 if (r <= 0 && w <= 0 && e <= 0)
 127                         return (0);
 128                 return (ENXIO);
 129         }
 130         r += pp->acr;
 131         w += pp->acw;
 132         e += pp->ace;
 133         error = 0;
 134         if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
 135                 if (dp->d_open != NULL) {
 136                         g_disk_lock_giant(dp);
 137                         error = dp->d_open(dp);
 138                         if (bootverbose && error != 0)
 139                                 printf("Opened disk %s -> %d\n",
 140                                     pp->name, error);
 141                         g_disk_unlock_giant(dp);
 142                         if (error != 0)
 143                                 return (error);
 144                 }
 145                 pp->mediasize = dp->d_mediasize;
 146                 pp->sectorsize = dp->d_sectorsize;
 147                 if (dp->d_maxsize == 0) {
 148                         printf("WARNING: Disk drive %s%d has no d_maxsize\n",
 149                             dp->d_name, dp->d_unit);
 150                         dp->d_maxsize = DFLTPHYS;
 151                 }
 152                 if (dp->d_delmaxsize == 0) {
 153                         if (bootverbose && dp->d_flags & DISKFLAG_CANDELETE) {
 154                                 printf("WARNING: Disk drive %s%d has no "
 155                                     "d_delmaxsize\n", dp->d_name, dp->d_unit);
 156                         }
 157                         dp->d_delmaxsize = dp->d_maxsize;
 158                 }
 159                 pp->stripeoffset = dp->d_stripeoffset;
 160                 pp->stripesize = dp->d_stripesize;
 161                 dp->d_flags |= DISKFLAG_OPEN;
 162         } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
 163                 if (dp->d_close != NULL) {
 164                         g_disk_lock_giant(dp);
 165                         error = dp->d_close(dp);
 166                         if (error != 0)
 167                                 printf("Closed disk %s -> %d\n",
 168                                     pp->name, error);
 169                         g_disk_unlock_giant(dp);
 170                 }
 171                 sc->state = G_STATE_ACTIVE;
 172                 if (sc->led[0] != 0)
 173                         led_set(sc->led, "0");
 174                 dp->d_flags &= ~DISKFLAG_OPEN;
 175         }
 176         return (error);
 177 }
 178
 179 static void
 180 g_disk_kerneldump(struct bio *bp, struct disk *dp)
 181 {
 182         struct g_kerneldump *gkd;
 183         struct g_geom *gp;
 184
 185         gkd = (struct g_kerneldump*)bp->bio_data;
 186         gp = bp->bio_to->geom;
 187         g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)",
 188                 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
 189         if (dp->d_dump == NULL) {
 190                 g_io_deliver(bp, ENODEV);
 191                 return;
 192         }
 193         gkd->di.dumper = dp->d_dump;
 194         gkd->di.priv = dp;
 195         gkd->di.blocksize = dp->d_sectorsize;
 196         gkd->di.maxiosize = dp->d_maxsize;
 197         gkd->di.mediaoffset = gkd->offset;
 198         if ((gkd->offset + gkd->length) > dp->d_mediasize)
 199                 gkd->length = dp->d_mediasize - gkd->offset;
 200         gkd->di.mediasize = gkd->length;
 201         g_io_deliver(bp, 0);
 202 }
 203
 204 static void
 205 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc)
 206 {
 207         const char *cmd;
 208
 209         memcpy(&sc->state, bp->bio_data, sizeof(sc->state));
 210         if (sc->led[0] != 0) {
 211                 switch (sc->state) {
 212                 case G_STATE_FAILED:
 213                         cmd = "1";
 214                         break;
 215                 case G_STATE_REBUILD:
 216                         cmd = "f5";
 217                         break;
 218                 case G_STATE_RESYNC:
 219                         cmd = "f1";
 220                         break;
 221                 default:
 222                         cmd = "0";
 223                         break;
 224                 }
 225                 led_set(sc->led, cmd);
 226         }
 227         g_io_deliver(bp, 0);
 228 }
 229
 230 static void
 231 g_disk_done(struct bio *bp)
 232 {
 233         struct bintime now;
 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         binuptime(&now);
 243         mtx_lock(&sc->done_mtx);
 244         if (bp2->bio_error == 0)
 245                 bp2->bio_error = bp->bio_error;
 246         bp2->bio_completed += bp->bio_completed;
 247         if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) != 0)
 248                 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now);
 249         bp2->bio_inbed++;
 250         if (bp2->bio_children == bp2->bio_inbed) {
 251                 mtx_unlock(&sc->done_mtx);
 252                 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
 253                 g_io_deliver(bp2, bp2->bio_error);
 254         } else
 255                 mtx_unlock(&sc->done_mtx);
 256         g_destroy_bio(bp);
 257 }
 258
 259 static void
 260 g_disk_done_single(struct bio *bp)
 261 {
 262         struct bintime now;
 263         struct g_disk_softc *sc;
 264
 265         bp->bio_completed = bp->bio_length - bp->bio_resid;
 266         bp->bio_done = (void *)bp->bio_to;
 267         bp->bio_to = LIST_FIRST(&bp->bio_disk->d_geom->provider);
 268         if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) != 0) {
 269                 binuptime(&now);
 270                 sc = bp->bio_to->private;
 271                 mtx_lock(&sc->done_mtx);
 272                 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now);
 273                 mtx_unlock(&sc->done_mtx);
 274         }
 275         g_io_deliver(bp, bp->bio_error);
 276 }
 277
 278 static int
 279 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
 280 {
 281         struct disk *dp;
 282         struct g_disk_softc *sc;
 283         int error;
 284
 285         sc = pp->private;
 286         dp = sc->dp;
 287
 288         if (dp->d_ioctl == NULL)
 289                 return (ENOIOCTL);
 290         g_disk_lock_giant(dp);
 291         error = dp->d_ioctl(dp, cmd, data, fflag, td);
 292         g_disk_unlock_giant(dp);
 293         return (error);
 294 }
 295
 296 static void
 297 g_disk_start(struct bio *bp)
 298 {
 299         struct bio *bp2, *bp3;
 300         struct disk *dp;
 301         struct g_disk_softc *sc;
 302         int error;
 303         off_t d_maxsize, off;
 304
 305         sc = bp->bio_to->private;
 306         if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
 307                 g_io_deliver(bp, ENXIO);
 308                 return;
 309         }
 310         error = EJUSTRETURN;
 311         switch(bp->bio_cmd) {
 312         case BIO_DELETE:
 313                 if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
 314                         error = EOPNOTSUPP;
 315                         break;
 316                 }
 317                 /* fall-through */
 318         case BIO_READ:
 319         case BIO_WRITE:
 320                 d_maxsize = (bp->bio_cmd == BIO_DELETE) ?
 321                     dp->d_delmaxsize : dp->d_maxsize;
 322                 if (bp->bio_length <= d_maxsize) {
 323                         bp->bio_disk = dp;
 324                         bp->bio_to = (void *)bp->bio_done;
 325                         bp->bio_done = g_disk_done_single;
 326                         bp->bio_pblkno = bp->bio_offset / dp->d_sectorsize;
 327                         bp->bio_bcount = bp->bio_length;
 328                         mtx_lock(&sc->start_mtx);
 329                         devstat_start_transaction_bio(dp->d_devstat, bp);
 330                         mtx_unlock(&sc->start_mtx);
 331                         g_disk_lock_giant(dp);
 332                         dp->d_strategy(bp);
 333                         g_disk_unlock_giant(dp);
 334                         break;
 335                 }
 336                 off = 0;
 337                 bp3 = NULL;
 338                 bp2 = g_clone_bio(bp);
 339                 if (bp2 == NULL) {
 340                         error = ENOMEM;
 341                         break;
 342                 }
 343                 do {
 344                         bp2->bio_offset += off;
 345                         bp2->bio_length -= off;
 346                         if ((bp->bio_flags & BIO_UNMAPPED) == 0) {
 347                                 bp2->bio_data += off;
 348                         } else {
 349                                 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO)
 350                                     != 0,
 351                                     ("unmapped bio not supported by disk %s",
 352                                     dp->d_name));
 353                                 bp2->bio_ma += off / PAGE_SIZE;
 354                                 bp2->bio_ma_offset += off;
 355                                 bp2->bio_ma_offset %= PAGE_SIZE;
 356                                 bp2->bio_ma_n -= off / PAGE_SIZE;
 357                         }
 358                         if (bp2->bio_length > d_maxsize) {
 359                                 /*
 360                                  * XXX: If we have a stripesize we should really
 361                                  * use it here. Care should be taken in the delete
 362                                  * case if this is done as deletes can be very
 363                                  * sensitive to size given how they are processed.
 364                                  */
 365                                 bp2->bio_length = d_maxsize;
 366                                 if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
 367                                         bp2->bio_ma_n = howmany(
 368                                             bp2->bio_ma_offset +
 369                                             bp2->bio_length, PAGE_SIZE);
 370                                 }
 371                                 off += d_maxsize;
 372                                 /*
 373                                  * To avoid a race, we need to grab the next bio
 374                                  * before we schedule this one.  See "notes".
 375                                  */
 376                                 bp3 = g_clone_bio(bp);
 377                                 if (bp3 == NULL)
 378                                         bp->bio_error = ENOMEM;
 379                         }
 380                         bp2->bio_done = g_disk_done;
 381                         bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
 382                         bp2->bio_bcount = bp2->bio_length;
 383                         bp2->bio_disk = dp;
 384                         mtx_lock(&sc->start_mtx);
 385                         devstat_start_transaction_bio(dp->d_devstat, bp2);
 386                         mtx_unlock(&sc->start_mtx);
 387                         g_disk_lock_giant(dp);
 388                         dp->d_strategy(bp2);
 389                         g_disk_unlock_giant(dp);
 390                         bp2 = bp3;
 391                         bp3 = NULL;
 392                 } while (bp2 != NULL);
 393                 break;
 394         case BIO_GETATTR:
 395                 /* Give the driver a chance to override */
 396                 if (dp->d_getattr != NULL) {
 397                         if (bp->bio_disk == NULL)
 398                                 bp->bio_disk = dp;
 399                         error = dp->d_getattr(bp);
 400                         if (error != -1)
 401                                 break;
 402                         error = EJUSTRETURN;
 403                 }
 404                 if (g_handleattr_int(bp, "GEOM::candelete",
 405                     (dp->d_flags & DISKFLAG_CANDELETE) != 0))
 406                         break;
 407                 else if (g_handleattr_int(bp, "GEOM::fwsectors",
 408                     dp->d_fwsectors))
 409                         break;
 410                 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
 411                         break;
 412                 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
 413                         break;
 414                 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident))
 415                         break;
 416                 else if (g_handleattr(bp, "GEOM::hba_vendor",
 417                     &dp->d_hba_vendor, 2))
 418                         break;
 419                 else if (g_handleattr(bp, "GEOM::hba_device",
 420                     &dp->d_hba_device, 2))
 421                         break;
 422                 else if (g_handleattr(bp, "GEOM::hba_subvendor",
 423                     &dp->d_hba_subvendor, 2))
 424                         break;
 425                 else if (g_handleattr(bp, "GEOM::hba_subdevice",
 426                     &dp->d_hba_subdevice, 2))
 427                         break;
 428                 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
 429                         g_disk_kerneldump(bp, dp);
 430                 else if (!strcmp(bp->bio_attribute, "GEOM::setstate"))
 431                         g_disk_setstate(bp, sc);
 432                 else
 433                         error = ENOIOCTL;
 434                 break;
 435         case BIO_FLUSH:
 436                 g_trace(G_T_BIO, "g_disk_flushcache(%s)",
 437                     bp->bio_to->name);
 438                 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) {
 439                         error = EOPNOTSUPP;
 440                         break;
 441                 }
 442                 bp->bio_disk = dp;
 443                 bp->bio_to = (void *)bp->bio_done;
 444                 bp->bio_done = g_disk_done_single;
 445                 g_disk_lock_giant(dp);
 446                 dp->d_strategy(bp);
 447                 g_disk_unlock_giant(dp);
 448                 break;
 449         default:
 450                 error = EOPNOTSUPP;
 451                 break;
 452         }
 453         if (error != EJUSTRETURN)
 454                 g_io_deliver(bp, error);
 455         return;
 456 }
 457
 458 static void
 459 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
 460 {
 461         struct bio *bp;
 462         struct disk *dp;
 463         struct g_disk_softc *sc;
 464         char *buf;
 465         int res = 0;
 466
 467         sc = gp->softc;
 468         if (sc == NULL || (dp = sc->dp) == NULL)
 469                 return;
 470         if (indent == NULL) {
 471                 sbuf_printf(sb, " hd %u", dp->d_fwheads);
 472                 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
 473                 return;
 474         }
 475         if (pp != NULL) {
 476                 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
 477                     indent, dp->d_fwheads);
 478                 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
 479                     indent, dp->d_fwsectors);
 480                 if (dp->d_getattr != NULL) {
 481                         buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK);
 482                         bp = g_alloc_bio();
 483                         bp->bio_disk = dp;
 484                         bp->bio_attribute = "GEOM::ident";
 485                         bp->bio_length = DISK_IDENT_SIZE;
 486                         bp->bio_data = buf;
 487                         res = dp->d_getattr(bp);
 488                         sbuf_printf(sb, "%s<ident>%s</ident>\n", indent,
 489                             res == 0 ? buf: dp->d_ident);
 490                         bp->bio_attribute = "GEOM::lunid";
 491                         bp->bio_length = DISK_IDENT_SIZE;
 492                         bp->bio_data = buf;
 493                         if (dp->d_getattr(bp) == 0)
 494                                 sbuf_printf(sb, "%s<lunid>%s</lunid>\n",
 495                                     indent, buf);
 496                         bp->bio_attribute = "GEOM::lunname";
 497                         bp->bio_length = DISK_IDENT_SIZE;
 498                         bp->bio_data = buf;
 499                         if (dp->d_getattr(bp) == 0)
 500                                 sbuf_printf(sb, "%s<lunname>%s</lunname>\n",
 501                                     indent, buf);
 502                         g_destroy_bio(bp);
 503                         g_free(buf);
 504                 } else
 505                         sbuf_printf(sb, "%s<ident>%s</ident>\n", indent,
 506                             dp->d_ident);
 507                 sbuf_printf(sb, "%s<descr>%s</descr>\n", indent, dp->d_descr);
 508         }
 509 }
 510
 511 static void
 512 g_disk_resize(void *ptr, int flag)
 513 {
 514         struct disk *dp;
 515         struct g_geom *gp;
 516         struct g_provider *pp;
 517
 518         if (flag == EV_CANCEL)
 519                 return;
 520         g_topology_assert();
 521
 522         dp = ptr;
 523         gp = dp->d_geom;
 524
 525         if (dp->d_destroyed || gp == NULL)
 526                 return;
 527
 528         LIST_FOREACH(pp, &gp->provider, provider) {
 529                 if (pp->sectorsize != 0 &&
 530                     pp->sectorsize != dp->d_sectorsize)
 531                         g_wither_provider(pp, ENXIO);
 532                 else
 533                         g_resize_provider(pp, dp->d_mediasize);
 534         }
 535 }
 536
 537 static void
 538 g_disk_create(void *arg, int flag)
 539 {
 540         struct g_geom *gp;
 541         struct g_provider *pp;
 542         struct disk *dp;
 543         struct g_disk_softc *sc;
 544         char tmpstr[80];
 545
 546         if (flag == EV_CANCEL)
 547                 return;
 548         g_topology_assert();
 549         dp = arg;
 550         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
 551         mtx_init(&sc->start_mtx, "g_disk_start", NULL, MTX_DEF);
 552         mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF);
 553         sc->dp = dp;
 554         gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
 555         gp->softc = sc;
 556         pp = g_new_providerf(gp, "%s", gp->name);
 557         devstat_remove_entry(pp->stat);
 558         pp->stat = NULL;
 559         dp->d_devstat->id = pp;
 560         pp->mediasize = dp->d_mediasize;
 561         pp->sectorsize = dp->d_sectorsize;
 562         pp->stripeoffset = dp->d_stripeoffset;
 563         pp->stripesize = dp->d_stripesize;
 564         if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0)
 565                 pp->flags |= G_PF_ACCEPT_UNMAPPED;
 566         if ((dp->d_flags & DISKFLAG_DIRECT_COMPLETION) != 0)
 567                 pp->flags |= G_PF_DIRECT_SEND;
 568         pp->flags |= G_PF_DIRECT_RECEIVE;
 569         if (bootverbose)
 570                 printf("GEOM: new disk %s\n", gp->name);
 571         sysctl_ctx_init(&sc->sysctl_ctx);
 572         snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name);
 573         sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
 574                 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name,
 575                 CTLFLAG_RD, 0, tmpstr);
 576         if (sc->sysctl_tree != NULL) {
 577                 snprintf(tmpstr, sizeof(tmpstr),
 578                     "kern.geom.disk.%s.led", gp->name);
 579                 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led));
 580                 SYSCTL_ADD_STRING(&sc->sysctl_ctx,
 581                     SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led",
 582                     CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led),
 583                     "LED name");
 584         }
 585         pp->private = sc;
 586         dp->d_geom = gp;
 587         g_error_provider(pp, 0);
 588 }
 589
 590 /*
 591  * We get this callback after all of the consumers have gone away, and just
 592  * before the provider is freed.  If the disk driver provided a d_gone
 593  * callback, let them know that it is okay to free resources -- they won't
 594  * be getting any more accesses from GEOM.
 595  */
 596 static void
 597 g_disk_providergone(struct g_provider *pp)
 598 {
 599         struct disk *dp;
 600         struct g_disk_softc *sc;
 601
 602         sc = (struct g_disk_softc *)pp->private;
 603         dp = sc->dp;
 604         if (dp != NULL && dp->d_gone != NULL)
 605                 dp->d_gone(dp);
 606         if (sc->sysctl_tree != NULL) {
 607                 sysctl_ctx_free(&sc->sysctl_ctx);
 608                 sc->sysctl_tree = NULL;
 609         }
 610         if (sc->led[0] != 0) {
 611                 led_set(sc->led, "0");
 612                 sc->led[0] = 0;
 613         }
 614         pp->private = NULL;
 615         pp->geom->softc = NULL;
 616         mtx_destroy(&sc->done_mtx);
 617         mtx_destroy(&sc->start_mtx);
 618         g_free(sc);
 619 }
 620
 621 static void
 622 g_disk_destroy(void *ptr, int flag)
 623 {
 624         struct disk *dp;
 625         struct g_geom *gp;
 626         struct g_disk_softc *sc;
 627
 628         g_topology_assert();
 629         dp = ptr;
 630         gp = dp->d_geom;
 631         if (gp != NULL) {
 632                 sc = gp->softc;
 633                 if (sc != NULL)
 634                         sc->dp = NULL;
 635                 dp->d_geom = NULL;
 636                 g_wither_geom(gp, ENXIO);
 637         }
 638         g_free(dp);
 639 }
 640
 641 /*
 642  * We only allow printable characters in disk ident,
 643  * the rest is converted to 'x<HH>'.
 644  */
 645 static void
 646 g_disk_ident_adjust(char *ident, size_t size)
 647 {
 648         char *p, tmp[4], newid[DISK_IDENT_SIZE];
 649
 650         newid[0] = '\0';
 651         for (p = ident; *p != '\0'; p++) {
 652                 if (isprint(*p)) {
 653                         tmp[0] = *p;
 654                         tmp[1] = '\0';
 655                 } else {
 656                         snprintf(tmp, sizeof(tmp), "x%02hhx",
 657                             *(unsigned char *)p);
 658                 }
 659                 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid))
 660                         break;
 661         }
 662         bzero(ident, size);
 663         strlcpy(ident, newid, size);
 664 }
 665
 666 struct disk *
 667 disk_alloc(void)
 668 {
 669
 670         return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO));
 671 }
 672
 673 void
 674 disk_create(struct disk *dp, int version)
 675 {
 676
 677         if (version != DISK_VERSION) {
 678                 printf("WARNING: Attempt to add disk %s%d %s",
 679                     dp->d_name, dp->d_unit,
 680                     " using incompatible ABI version of disk(9)\n");
 681                 printf("WARNING: Ignoring disk %s%d\n",
 682                     dp->d_name, dp->d_unit);
 683                 return;
 684         }
 685         KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
 686         KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
 687         KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
 688         KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
 689         if (dp->d_devstat == NULL)
 690                 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
 691                     dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
 692                     DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
 693         dp->d_geom = NULL;
 694         g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident));
 695         g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
 696 }
 697
 698 void
 699 disk_destroy(struct disk *dp)
 700 {
 701
 702         g_cancel_event(dp);
 703         dp->d_destroyed = 1;
 704         if (dp->d_devstat != NULL)
 705                 devstat_remove_entry(dp->d_devstat);
 706         g_post_event(g_disk_destroy, dp, M_WAITOK, NULL);
 707 }
 708
 709 void
 710 disk_gone(struct disk *dp)
 711 {
 712         struct g_geom *gp;
 713         struct g_provider *pp;
 714
 715         gp = dp->d_geom;
 716         if (gp != NULL) {
 717                 pp = LIST_FIRST(&gp->provider);
 718                 if (pp != NULL) {
 719                         KASSERT(LIST_NEXT(pp, provider) == NULL,
 720                             ("geom %p has more than one provider", gp));
 721                         g_wither_provider(pp, ENXIO);
 722                 }
 723         }
 724 }
 725
 726 void
 727 disk_attr_changed(struct disk *dp, const char *attr, int flag)
 728 {
 729         struct g_geom *gp;
 730         struct g_provider *pp;
 731
 732         gp = dp->d_geom;
 733         if (gp != NULL)
 734                 LIST_FOREACH(pp, &gp->provider, provider)
 735                         (void)g_attr_changed(pp, attr, flag);
 736 }
 737
 738 void
 739 disk_media_changed(struct disk *dp, int flag)
 740 {
 741         struct g_geom *gp;
 742         struct g_provider *pp;
 743
 744         gp = dp->d_geom;
 745         if (gp != NULL) {
 746                 pp = LIST_FIRST(&gp->provider);
 747                 if (pp != NULL) {
 748                         KASSERT(LIST_NEXT(pp, provider) == NULL,
 749                             ("geom %p has more than one provider", gp));
 750                         g_media_changed(pp, flag);
 751                 }
 752         }
 753 }
 754
 755 void
 756 disk_media_gone(struct disk *dp, int flag)
 757 {
 758         struct g_geom *gp;
 759         struct g_provider *pp;
 760
 761         gp = dp->d_geom;
 762         if (gp != NULL) {
 763                 pp = LIST_FIRST(&gp->provider);
 764                 if (pp != NULL) {
 765                         KASSERT(LIST_NEXT(pp, provider) == NULL,
 766                             ("geom %p has more than one provider", gp));
 767                         g_media_gone(pp, flag);
 768                 }
 769         }
 770 }
 771
 772 int
 773 disk_resize(struct disk *dp, int flag)
 774 {
 775
 776         if (dp->d_destroyed || dp->d_geom == NULL)
 777                 return (0);
 778
 779         return (g_post_event(g_disk_resize, dp, flag, NULL));
 780 }
 781
 782 static void
 783 g_kern_disks(void *p, int flag __unused)
 784 {
 785         struct sbuf *sb;
 786         struct g_geom *gp;
 787         char *sp;
 788
 789         sb = p;
 790         sp = "";
 791         g_topology_assert();
 792         LIST_FOREACH(gp, &g_disk_class.geom, geom) {
 793                 sbuf_printf(sb, "%s%s", sp, gp->name);
 794                 sp = " ";
 795         }
 796         sbuf_finish(sb);
 797 }
 798
 799 static int
 800 sysctl_disks(SYSCTL_HANDLER_ARGS)
 801 {
 802         int error;
 803         struct sbuf *sb;
 804
 805         sb = sbuf_new_auto();
 806         g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
 807         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
 808         sbuf_delete(sb);
 809         return error;
 810 }
 811
 812 SYSCTL_PROC(_kern, OID_AUTO, disks,
 813     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 814     sysctl_disks, "A", "names of available disks");