The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/geom/geom_disk.c

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    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: releng/10.0/sys/geom/geom_disk.c 254766 2013-08-24 09:42:14Z mav $");
   38 
   39 #include "opt_geom.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/kernel.h>
   44 #include <sys/sysctl.h>
   45 #include <sys/bio.h>
   46 #include <sys/ctype.h>
   47 #include <sys/fcntl.h>
   48 #include <sys/malloc.h>
   49 #include <sys/sbuf.h>
   50 #include <sys/sysctl.h>
   51 #include <sys/devicestat.h>
   52 #include <machine/md_var.h>
   53 
   54 #include <sys/lock.h>
   55 #include <sys/mutex.h>
   56 #include <geom/geom.h>
   57 #include <geom/geom_disk.h>
   58 #include <geom/geom_int.h>
   59 
   60 #include <dev/led/led.h>
   61 
   62 struct g_disk_softc {
   63         struct mtx               done_mtx;
   64         struct disk             *dp;
   65         struct sysctl_ctx_list  sysctl_ctx;
   66         struct sysctl_oid       *sysctl_tree;
   67         char                    led[64];
   68         uint32_t                state;
   69 };
   70 
   71 static g_access_t g_disk_access;
   72 static g_start_t g_disk_start;
   73 static g_ioctl_t g_disk_ioctl;
   74 static g_dumpconf_t g_disk_dumpconf;
   75 static g_provgone_t g_disk_providergone;
   76 
   77 static struct g_class g_disk_class = {
   78         .name = G_DISK_CLASS_NAME,
   79         .version = G_VERSION,
   80         .start = g_disk_start,
   81         .access = g_disk_access,
   82         .ioctl = g_disk_ioctl,
   83         .providergone = g_disk_providergone,
   84         .dumpconf = g_disk_dumpconf,
   85 };
   86 
   87 SYSCTL_DECL(_kern_geom);
   88 static SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0,
   89     "GEOM_DISK stuff");
   90 
   91 DECLARE_GEOM_CLASS(g_disk_class, g_disk);
   92 
   93 static void __inline
   94 g_disk_lock_giant(struct disk *dp)
   95 {
   96 
   97         if (dp->d_flags & DISKFLAG_NEEDSGIANT)
   98                 mtx_lock(&Giant);
   99 }
  100 
  101 static void __inline
  102 g_disk_unlock_giant(struct disk *dp)
  103 {
  104 
  105         if (dp->d_flags & DISKFLAG_NEEDSGIANT)
  106                 mtx_unlock(&Giant);
  107 }
  108 
  109 static int
  110 g_disk_access(struct g_provider *pp, int r, int w, int e)
  111 {
  112         struct disk *dp;
  113         struct g_disk_softc *sc;
  114         int error;
  115 
  116         g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
  117             pp->name, r, w, e);
  118         g_topology_assert();
  119         sc = pp->private;
  120         if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
  121                 /*
  122                  * Allow decreasing access count even if disk is not
  123                  * avaliable anymore.
  124                  */
  125                 if (r <= 0 && w <= 0 && e <= 0)
  126                         return (0);
  127                 return (ENXIO);
  128         }
  129         r += pp->acr;
  130         w += pp->acw;
  131         e += pp->ace;
  132         error = 0;
  133         if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
  134                 if (dp->d_open != NULL) {
  135                         g_disk_lock_giant(dp);
  136                         error = dp->d_open(dp);
  137                         if (bootverbose && error != 0)
  138                                 printf("Opened disk %s -> %d\n",
  139                                     pp->name, error);
  140                         g_disk_unlock_giant(dp);
  141                         if (error != 0)
  142                                 return (error);
  143                 }
  144                 pp->mediasize = dp->d_mediasize;
  145                 pp->sectorsize = dp->d_sectorsize;
  146                 if (dp->d_maxsize == 0) {
  147                         printf("WARNING: Disk drive %s%d has no d_maxsize\n",
  148                             dp->d_name, dp->d_unit);
  149                         dp->d_maxsize = DFLTPHYS;
  150                 }
  151                 if (dp->d_delmaxsize == 0) {
  152                         if (bootverbose && dp->d_flags & DISKFLAG_CANDELETE) {
  153                                 printf("WARNING: Disk drive %s%d has no "
  154                                     "d_delmaxsize\n", dp->d_name, dp->d_unit);
  155                         }
  156                         dp->d_delmaxsize = dp->d_maxsize;
  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, "");
  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 = "";
  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 bio *bp;
  429         struct disk *dp;
  430         struct g_disk_softc *sc;
  431         char *buf;
  432         int res = 0;
  433 
  434         sc = gp->softc;
  435         if (sc == NULL || (dp = sc->dp) == NULL)
  436                 return;
  437         if (indent == NULL) {
  438                 sbuf_printf(sb, " hd %u", dp->d_fwheads);
  439                 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
  440                 return;
  441         }
  442         if (pp != NULL) {
  443                 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
  444                     indent, dp->d_fwheads);
  445                 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
  446                     indent, dp->d_fwsectors);
  447                 if (dp->d_getattr != NULL) {
  448                         buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK);
  449                         bp = g_alloc_bio();
  450                         bp->bio_disk = dp;
  451                         bp->bio_attribute = "GEOM::ident";
  452                         bp->bio_length = DISK_IDENT_SIZE;
  453                         bp->bio_data = buf;
  454                         res = dp->d_getattr(bp);
  455                         sbuf_printf(sb, "%s<ident>%s</ident>\n", indent,
  456                             res == 0 ? buf: dp->d_ident);
  457                         bp->bio_attribute = "GEOM::lunid";
  458                         bp->bio_length = DISK_IDENT_SIZE;
  459                         bp->bio_data = buf;
  460                         if (dp->d_getattr(bp) == 0)
  461                                 sbuf_printf(sb, "%s<lunid>%s</lunid>\n",
  462                                     indent, buf);
  463                         bp->bio_attribute = "GEOM::lunname";
  464                         bp->bio_length = DISK_IDENT_SIZE;
  465                         bp->bio_data = buf;
  466                         if (dp->d_getattr(bp) == 0)
  467                                 sbuf_printf(sb, "%s<lunname>%s</lunname>\n",
  468                                     indent, buf);
  469                         g_destroy_bio(bp);
  470                         g_free(buf);
  471                 } else
  472                         sbuf_printf(sb, "%s<ident>%s</ident>\n", indent,
  473                             dp->d_ident);
  474                 sbuf_printf(sb, "%s<descr>%s</descr>\n", indent, dp->d_descr);
  475         }
  476 }
  477 
  478 static void
  479 g_disk_resize(void *ptr, int flag)
  480 {
  481         struct disk *dp;
  482         struct g_geom *gp;
  483         struct g_provider *pp;
  484 
  485         if (flag == EV_CANCEL)
  486                 return;
  487         g_topology_assert();
  488 
  489         dp = ptr;
  490         gp = dp->d_geom;
  491 
  492         if (dp->d_destroyed || gp == NULL)
  493                 return;
  494 
  495         LIST_FOREACH(pp, &gp->provider, provider) {
  496                 if (pp->sectorsize != 0 &&
  497                     pp->sectorsize != dp->d_sectorsize)
  498                         g_wither_provider(pp, ENXIO);
  499                 else
  500                         g_resize_provider(pp, dp->d_mediasize);
  501         }
  502 }
  503 
  504 static void
  505 g_disk_create(void *arg, int flag)
  506 {
  507         struct g_geom *gp;
  508         struct g_provider *pp;
  509         struct disk *dp;
  510         struct g_disk_softc *sc;
  511         char tmpstr[80];
  512 
  513         if (flag == EV_CANCEL)
  514                 return;
  515         g_topology_assert();
  516         dp = arg;
  517         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
  518         mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF);
  519         sc->dp = dp;
  520         gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
  521         gp->softc = sc;
  522         pp = g_new_providerf(gp, "%s", gp->name);
  523         pp->mediasize = dp->d_mediasize;
  524         pp->sectorsize = dp->d_sectorsize;
  525         pp->stripeoffset = dp->d_stripeoffset;
  526         pp->stripesize = dp->d_stripesize;
  527         if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0)
  528                 pp->flags |= G_PF_ACCEPT_UNMAPPED;
  529         if (bootverbose)
  530                 printf("GEOM: new disk %s\n", gp->name);
  531         sysctl_ctx_init(&sc->sysctl_ctx);
  532         snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name);
  533         sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
  534                 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name,
  535                 CTLFLAG_RD, 0, tmpstr);
  536         if (sc->sysctl_tree != NULL) {
  537                 snprintf(tmpstr, sizeof(tmpstr),
  538                     "kern.geom.disk.%s.led", gp->name);
  539                 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led));
  540                 SYSCTL_ADD_STRING(&sc->sysctl_ctx,
  541                     SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led",
  542                     CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led),
  543                     "LED name");
  544         }
  545         pp->private = sc;
  546         dp->d_geom = gp;
  547         g_error_provider(pp, 0);
  548 }
  549 
  550 /*
  551  * We get this callback after all of the consumers have gone away, and just
  552  * before the provider is freed.  If the disk driver provided a d_gone
  553  * callback, let them know that it is okay to free resources -- they won't
  554  * be getting any more accesses from GEOM.
  555  */
  556 static void
  557 g_disk_providergone(struct g_provider *pp)
  558 {
  559         struct disk *dp;
  560         struct g_disk_softc *sc;
  561 
  562         sc = (struct g_disk_softc *)pp->private;
  563         dp = sc->dp;
  564         if (dp != NULL && dp->d_gone != NULL)
  565                 dp->d_gone(dp);
  566         if (sc->sysctl_tree != NULL) {
  567                 sysctl_ctx_free(&sc->sysctl_ctx);
  568                 sc->sysctl_tree = NULL;
  569         }
  570         if (sc->led[0] != 0) {
  571                 led_set(sc->led, "");
  572                 sc->led[0] = 0;
  573         }
  574         pp->private = NULL;
  575         pp->geom->softc = NULL;
  576         mtx_destroy(&sc->done_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         KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
  645         KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
  646         KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
  647         KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
  648         if (dp->d_devstat == NULL)
  649                 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
  650                     dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
  651                     DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
  652         dp->d_geom = NULL;
  653         g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident));
  654         g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
  655 }
  656 
  657 void
  658 disk_destroy(struct disk *dp)
  659 {
  660 
  661         g_cancel_event(dp);
  662         dp->d_destroyed = 1;
  663         if (dp->d_devstat != NULL)
  664                 devstat_remove_entry(dp->d_devstat);
  665         g_post_event(g_disk_destroy, dp, M_WAITOK, NULL);
  666 }
  667 
  668 void
  669 disk_gone(struct disk *dp)
  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_wither_provider(pp, ENXIO);
  681                 }
  682         }
  683 }
  684 
  685 void
  686 disk_attr_changed(struct disk *dp, const char *attr, int flag)
  687 {
  688         struct g_geom *gp;
  689         struct g_provider *pp;
  690 
  691         gp = dp->d_geom;
  692         if (gp != NULL)
  693                 LIST_FOREACH(pp, &gp->provider, provider)
  694                         (void)g_attr_changed(pp, attr, flag);
  695 }
  696 
  697 void
  698 disk_media_changed(struct disk *dp, int flag)
  699 {
  700         struct g_geom *gp;
  701         struct g_provider *pp;
  702 
  703         gp = dp->d_geom;
  704         if (gp != NULL) {
  705                 pp = LIST_FIRST(&gp->provider);
  706                 if (pp != NULL) {
  707                         KASSERT(LIST_NEXT(pp, provider) == NULL,
  708                             ("geom %p has more than one provider", gp));
  709                         g_media_changed(pp, flag);
  710                 }
  711         }
  712 }
  713 
  714 void
  715 disk_media_gone(struct disk *dp, int flag)
  716 {
  717         struct g_geom *gp;
  718         struct g_provider *pp;
  719 
  720         gp = dp->d_geom;
  721         if (gp != NULL) {
  722                 pp = LIST_FIRST(&gp->provider);
  723                 if (pp != NULL) {
  724                         KASSERT(LIST_NEXT(pp, provider) == NULL,
  725                             ("geom %p has more than one provider", gp));
  726                         g_media_gone(pp, flag);
  727                 }
  728         }
  729 }
  730 
  731 int
  732 disk_resize(struct disk *dp, int flag)
  733 {
  734 
  735         if (dp->d_destroyed || dp->d_geom == NULL)
  736                 return (0);
  737 
  738         return (g_post_event(g_disk_resize, dp, flag, NULL));
  739 }
  740 
  741 static void
  742 g_kern_disks(void *p, int flag __unused)
  743 {
  744         struct sbuf *sb;
  745         struct g_geom *gp;
  746         char *sp;
  747 
  748         sb = p;
  749         sp = "";
  750         g_topology_assert();
  751         LIST_FOREACH(gp, &g_disk_class.geom, geom) {
  752                 sbuf_printf(sb, "%s%s", sp, gp->name);
  753                 sp = " ";
  754         }
  755         sbuf_finish(sb);
  756 }
  757 
  758 static int
  759 sysctl_disks(SYSCTL_HANDLER_ARGS)
  760 {
  761         int error;
  762         struct sbuf *sb;
  763 
  764         sb = sbuf_new_auto();
  765         g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
  766         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  767         sbuf_delete(sb);
  768         return error;
  769 }
  770  
  771 SYSCTL_PROC(_kern, OID_AUTO, disks,
  772     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
  773     sysctl_disks, "A", "names of available disks");

Cache object: 17f31c95f51588def9e5c78b3b380f15


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