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/10.1/sys/geom/geom_disk.c 273776 2014-10-28 14:01:58Z 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/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 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_kerneldump(%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 bintime now;
  233         struct bio *bp2;
  234         struct g_disk_softc *sc;
  235 
  236         /* See "notes" for why we need a mutex here */
  237         /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */
  238         bp2 = bp->bio_parent;
  239         sc = bp2->bio_to->private;
  240         bp->bio_completed = bp->bio_length - bp->bio_resid;
  241         binuptime(&now);
  242         mtx_lock(&sc->done_mtx);
  243         if (bp2->bio_error == 0)
  244                 bp2->bio_error = bp->bio_error;
  245         bp2->bio_completed += bp->bio_completed;
  246         if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE|BIO_FLUSH)) != 0)
  247                 devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now);
  248         bp2->bio_inbed++;
  249         if (bp2->bio_children == bp2->bio_inbed) {
  250                 mtx_unlock(&sc->done_mtx);
  251                 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
  252                 g_io_deliver(bp2, bp2->bio_error);
  253         } else
  254                 mtx_unlock(&sc->done_mtx);
  255         g_destroy_bio(bp);
  256 }
  257 
  258 static int
  259 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
  260 {
  261         struct disk *dp;
  262         struct g_disk_softc *sc;
  263         int error;
  264 
  265         sc = pp->private;
  266         dp = sc->dp;
  267 
  268         if (dp->d_ioctl == NULL)
  269                 return (ENOIOCTL);
  270         g_disk_lock_giant(dp);
  271         error = dp->d_ioctl(dp, cmd, data, fflag, td);
  272         g_disk_unlock_giant(dp);
  273         return (error);
  274 }
  275 
  276 static void
  277 g_disk_start(struct bio *bp)
  278 {
  279         struct bio *bp2, *bp3;
  280         struct disk *dp;
  281         struct g_disk_softc *sc;
  282         int error;
  283         off_t off;
  284 
  285         sc = bp->bio_to->private;
  286         if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
  287                 g_io_deliver(bp, ENXIO);
  288                 return;
  289         }
  290         error = EJUSTRETURN;
  291         switch(bp->bio_cmd) {
  292         case BIO_DELETE:
  293                 if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
  294                         error = EOPNOTSUPP;
  295                         break;
  296                 }
  297                 /* fall-through */
  298         case BIO_READ:
  299         case BIO_WRITE:
  300                 off = 0;
  301                 bp3 = NULL;
  302                 bp2 = g_clone_bio(bp);
  303                 if (bp2 == NULL) {
  304                         error = ENOMEM;
  305                         break;
  306                 }
  307                 do {
  308                         off_t d_maxsize;
  309 
  310                         d_maxsize = (bp->bio_cmd == BIO_DELETE) ?
  311                             dp->d_delmaxsize : dp->d_maxsize;
  312                         bp2->bio_offset += off;
  313                         bp2->bio_length -= off;
  314                         if ((bp->bio_flags & BIO_UNMAPPED) == 0) {
  315                                 bp2->bio_data += off;
  316                         } else {
  317                                 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO)
  318                                     != 0,
  319                                     ("unmapped bio not supported by disk %s",
  320                                     dp->d_name));
  321                                 bp2->bio_ma += off / PAGE_SIZE;
  322                                 bp2->bio_ma_offset += off;
  323                                 bp2->bio_ma_offset %= PAGE_SIZE;
  324                                 bp2->bio_ma_n -= off / PAGE_SIZE;
  325                         }
  326                         if (bp2->bio_length > d_maxsize) {
  327                                 /*
  328                                  * XXX: If we have a stripesize we should really
  329                                  * use it here. Care should be taken in the delete
  330                                  * case if this is done as deletes can be very 
  331                                  * sensitive to size given how they are processed.
  332                                  */
  333                                 bp2->bio_length = d_maxsize;
  334                                 if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
  335                                         bp2->bio_ma_n = howmany(
  336                                             bp2->bio_ma_offset +
  337                                             bp2->bio_length, PAGE_SIZE);
  338                                 }
  339                                 off += d_maxsize;
  340                                 /*
  341                                  * To avoid a race, we need to grab the next bio
  342                                  * before we schedule this one.  See "notes".
  343                                  */
  344                                 bp3 = g_clone_bio(bp);
  345                                 if (bp3 == NULL)
  346                                         bp->bio_error = ENOMEM;
  347                         }
  348                         bp2->bio_done = g_disk_done;
  349                         bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
  350                         bp2->bio_bcount = bp2->bio_length;
  351                         bp2->bio_disk = dp;
  352                         mtx_lock(&sc->start_mtx); 
  353                         devstat_start_transaction_bio(dp->d_devstat, bp2);
  354                         mtx_unlock(&sc->start_mtx); 
  355                         g_disk_lock_giant(dp);
  356                         dp->d_strategy(bp2);
  357                         g_disk_unlock_giant(dp);
  358                         bp2 = bp3;
  359                         bp3 = NULL;
  360                 } while (bp2 != NULL);
  361                 break;
  362         case BIO_GETATTR:
  363                 /* Give the driver a chance to override */
  364                 if (dp->d_getattr != NULL) {
  365                         if (bp->bio_disk == NULL)
  366                                 bp->bio_disk = dp;
  367                         error = dp->d_getattr(bp);
  368                         if (error != -1)
  369                                 break;
  370                         error = EJUSTRETURN;
  371                 }
  372                 if (g_handleattr_int(bp, "GEOM::candelete",
  373                     (dp->d_flags & DISKFLAG_CANDELETE) != 0))
  374                         break;
  375                 else if (g_handleattr_int(bp, "GEOM::fwsectors",
  376                     dp->d_fwsectors))
  377                         break;
  378                 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
  379                         break;
  380                 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
  381                         break;
  382                 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident))
  383                         break;
  384                 else if (g_handleattr_uint16_t(bp, "GEOM::hba_vendor",
  385                     dp->d_hba_vendor))
  386                         break;
  387                 else if (g_handleattr_uint16_t(bp, "GEOM::hba_device",
  388                     dp->d_hba_device))
  389                         break;
  390                 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subvendor",
  391                     dp->d_hba_subvendor))
  392                         break;
  393                 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subdevice",
  394                     dp->d_hba_subdevice))
  395                         break;
  396                 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
  397                         g_disk_kerneldump(bp, dp);
  398                 else if (!strcmp(bp->bio_attribute, "GEOM::setstate"))
  399                         g_disk_setstate(bp, sc);
  400                 else if (!strcmp(bp->bio_attribute, "GEOM::rotation_rate")) {
  401                         uint64_t v;
  402 
  403                         if ((dp->d_flags & DISKFLAG_LACKS_ROTRATE) == 0)
  404                                 v = dp->d_rotation_rate;
  405                         else
  406                                 v = 0; /* rate unknown */
  407                         g_handleattr_uint16_t(bp, "GEOM::rotation_rate", v);
  408                         break;
  409                 } else 
  410                         error = ENOIOCTL;
  411                 break;
  412         case BIO_FLUSH:
  413                 g_trace(G_T_BIO, "g_disk_flushcache(%s)",
  414                     bp->bio_to->name);
  415                 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) {
  416                         error = EOPNOTSUPP;
  417                         break;
  418                 }
  419                 bp2 = g_clone_bio(bp);
  420                 if (bp2 == NULL) {
  421                         g_io_deliver(bp, ENOMEM);
  422                         return;
  423                 }
  424                 bp2->bio_done = g_disk_done;
  425                 bp2->bio_disk = dp;
  426                 mtx_lock(&sc->start_mtx);
  427                 devstat_start_transaction_bio(dp->d_devstat, bp2);
  428                 mtx_unlock(&sc->start_mtx);
  429                 g_disk_lock_giant(dp);
  430                 dp->d_strategy(bp2);
  431                 g_disk_unlock_giant(dp);
  432                 break;
  433         default:
  434                 error = EOPNOTSUPP;
  435                 break;
  436         }
  437         if (error != EJUSTRETURN)
  438                 g_io_deliver(bp, error);
  439         return;
  440 }
  441 
  442 static void
  443 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
  444 {
  445         struct bio *bp;
  446         struct disk *dp;
  447         struct g_disk_softc *sc;
  448         char *buf;
  449         int res = 0;
  450 
  451         sc = gp->softc;
  452         if (sc == NULL || (dp = sc->dp) == NULL)
  453                 return;
  454         if (indent == NULL) {
  455                 sbuf_printf(sb, " hd %u", dp->d_fwheads);
  456                 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
  457                 return;
  458         }
  459         if (pp != NULL) {
  460                 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
  461                     indent, dp->d_fwheads);
  462                 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
  463                     indent, dp->d_fwsectors);
  464                 if (dp->d_getattr != NULL) {
  465                         buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK);
  466                         bp = g_alloc_bio();
  467                         bp->bio_disk = dp;
  468                         bp->bio_attribute = "GEOM::ident";
  469                         bp->bio_length = DISK_IDENT_SIZE;
  470                         bp->bio_data = buf;
  471                         res = dp->d_getattr(bp);
  472                         sbuf_printf(sb, "%s<ident>", indent);
  473                         g_conf_printf_escaped(sb, "%s",
  474                             res == 0 ? buf: dp->d_ident);
  475                         sbuf_printf(sb, "</ident>\n");
  476                         bp->bio_attribute = "GEOM::lunid";
  477                         bp->bio_length = DISK_IDENT_SIZE;
  478                         bp->bio_data = buf;
  479                         if (dp->d_getattr(bp) == 0) {
  480                                 sbuf_printf(sb, "%s<lunid>", indent);
  481                                 g_conf_printf_escaped(sb, "%s", buf);
  482                                 sbuf_printf(sb, "</lunid>\n");
  483                         }
  484                         bp->bio_attribute = "GEOM::lunname";
  485                         bp->bio_length = DISK_IDENT_SIZE;
  486                         bp->bio_data = buf;
  487                         if (dp->d_getattr(bp) == 0) {
  488                                 sbuf_printf(sb, "%s<lunname>", indent);
  489                                 g_conf_printf_escaped(sb, "%s", buf);
  490                                 sbuf_printf(sb, "</lunname>\n");
  491                         }
  492                         g_destroy_bio(bp);
  493                         g_free(buf);
  494                 } else {
  495                         sbuf_printf(sb, "%s<ident>", indent);
  496                         g_conf_printf_escaped(sb, "%s", dp->d_ident);
  497                         sbuf_printf(sb, "</ident>\n");
  498                 }
  499                 sbuf_printf(sb, "%s<descr>", indent);
  500                 g_conf_printf_escaped(sb, "%s", dp->d_descr);
  501                 sbuf_printf(sb, "</descr>\n");
  502         }
  503 }
  504 
  505 static void
  506 g_disk_resize(void *ptr, int flag)
  507 {
  508         struct disk *dp;
  509         struct g_geom *gp;
  510         struct g_provider *pp;
  511 
  512         if (flag == EV_CANCEL)
  513                 return;
  514         g_topology_assert();
  515 
  516         dp = ptr;
  517         gp = dp->d_geom;
  518 
  519         if (dp->d_destroyed || gp == NULL)
  520                 return;
  521 
  522         LIST_FOREACH(pp, &gp->provider, provider) {
  523                 if (pp->sectorsize != 0 &&
  524                     pp->sectorsize != dp->d_sectorsize)
  525                         g_wither_provider(pp, ENXIO);
  526                 else
  527                         g_resize_provider(pp, dp->d_mediasize);
  528         }
  529 }
  530 
  531 static void
  532 g_disk_create(void *arg, int flag)
  533 {
  534         struct g_geom *gp;
  535         struct g_provider *pp;
  536         struct disk *dp;
  537         struct g_disk_softc *sc;
  538         char tmpstr[80];
  539 
  540         if (flag == EV_CANCEL)
  541                 return;
  542         g_topology_assert();
  543         dp = arg;
  544         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
  545         mtx_init(&sc->start_mtx, "g_disk_start", NULL, MTX_DEF);
  546         mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF);
  547         sc->dp = dp;
  548         gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
  549         gp->softc = sc;
  550         pp = g_new_providerf(gp, "%s", gp->name);
  551         devstat_remove_entry(pp->stat);
  552         pp->stat = NULL;
  553         dp->d_devstat->id = pp;
  554         pp->mediasize = dp->d_mediasize;
  555         pp->sectorsize = dp->d_sectorsize;
  556         pp->stripeoffset = dp->d_stripeoffset;
  557         pp->stripesize = dp->d_stripesize;
  558         if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0)
  559                 pp->flags |= G_PF_ACCEPT_UNMAPPED;
  560         if ((dp->d_flags & DISKFLAG_DIRECT_COMPLETION) != 0)
  561                 pp->flags |= G_PF_DIRECT_SEND;
  562         pp->flags |= G_PF_DIRECT_RECEIVE;
  563         if (bootverbose)
  564                 printf("GEOM: new disk %s\n", gp->name);
  565         sysctl_ctx_init(&sc->sysctl_ctx);
  566         snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name);
  567         sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
  568                 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name,
  569                 CTLFLAG_RD, 0, tmpstr);
  570         if (sc->sysctl_tree != NULL) {
  571                 snprintf(tmpstr, sizeof(tmpstr),
  572                     "kern.geom.disk.%s.led", gp->name);
  573                 TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led));
  574                 SYSCTL_ADD_STRING(&sc->sysctl_ctx,
  575                     SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led",
  576                     CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led),
  577                     "LED name");
  578         }
  579         pp->private = sc;
  580         dp->d_geom = gp;
  581         g_error_provider(pp, 0);
  582 }
  583 
  584 /*
  585  * We get this callback after all of the consumers have gone away, and just
  586  * before the provider is freed.  If the disk driver provided a d_gone
  587  * callback, let them know that it is okay to free resources -- they won't
  588  * be getting any more accesses from GEOM.
  589  */
  590 static void
  591 g_disk_providergone(struct g_provider *pp)
  592 {
  593         struct disk *dp;
  594         struct g_disk_softc *sc;
  595 
  596         sc = (struct g_disk_softc *)pp->private;
  597         dp = sc->dp;
  598         if (dp != NULL && dp->d_gone != NULL)
  599                 dp->d_gone(dp);
  600         if (sc->sysctl_tree != NULL) {
  601                 sysctl_ctx_free(&sc->sysctl_ctx);
  602                 sc->sysctl_tree = NULL;
  603         }
  604         if (sc->led[0] != 0) {
  605                 led_set(sc->led, "");
  606                 sc->led[0] = 0;
  607         }
  608         pp->private = NULL;
  609         pp->geom->softc = NULL;
  610         mtx_destroy(&sc->done_mtx);
  611         mtx_destroy(&sc->start_mtx);
  612         g_free(sc);
  613 }
  614 
  615 static void
  616 g_disk_destroy(void *ptr, int flag)
  617 {
  618         struct disk *dp;
  619         struct g_geom *gp;
  620         struct g_disk_softc *sc;
  621 
  622         g_topology_assert();
  623         dp = ptr;
  624         gp = dp->d_geom;
  625         if (gp != NULL) {
  626                 sc = gp->softc;
  627                 if (sc != NULL)
  628                         sc->dp = NULL;
  629                 dp->d_geom = NULL;
  630                 g_wither_geom(gp, ENXIO);
  631         }
  632         g_free(dp);
  633 }
  634 
  635 /*
  636  * We only allow printable characters in disk ident,
  637  * the rest is converted to 'x<HH>'.
  638  */
  639 static void
  640 g_disk_ident_adjust(char *ident, size_t size)
  641 {
  642         char *p, tmp[4], newid[DISK_IDENT_SIZE];
  643 
  644         newid[0] = '\0';
  645         for (p = ident; *p != '\0'; p++) {
  646                 if (isprint(*p)) {
  647                         tmp[0] = *p;
  648                         tmp[1] = '\0';
  649                 } else {
  650                         snprintf(tmp, sizeof(tmp), "x%02hhx",
  651                             *(unsigned char *)p);
  652                 }
  653                 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid))
  654                         break;
  655         }
  656         bzero(ident, size);
  657         strlcpy(ident, newid, size);
  658 }
  659 
  660 struct disk *
  661 disk_alloc(void)
  662 {
  663 
  664         return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO));
  665 }
  666 
  667 void
  668 disk_create(struct disk *dp, int version)
  669 {
  670 
  671         if (version != DISK_VERSION) {
  672                 printf("WARNING: Attempt to add disk %s%d %s",
  673                     dp->d_name, dp->d_unit,
  674                     " using incompatible ABI version of disk(9)\n");
  675                 printf("WARNING: Ignoring disk %s%d\n",
  676                     dp->d_name, dp->d_unit);
  677                 return;
  678         }
  679         if (version < DISK_VERSION_04)
  680                 dp->d_flags |= DISKFLAG_LACKS_ROTRATE;
  681         KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
  682         KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
  683         KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
  684         KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
  685         if (dp->d_devstat == NULL)
  686                 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
  687                     dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
  688                     DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
  689         dp->d_geom = NULL;
  690         g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident));
  691         g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
  692 }
  693 
  694 void
  695 disk_destroy(struct disk *dp)
  696 {
  697 
  698         g_cancel_event(dp);
  699         dp->d_destroyed = 1;
  700         if (dp->d_devstat != NULL)
  701                 devstat_remove_entry(dp->d_devstat);
  702         g_post_event(g_disk_destroy, dp, M_WAITOK, NULL);
  703 }
  704 
  705 void
  706 disk_gone(struct disk *dp)
  707 {
  708         struct g_geom *gp;
  709         struct g_provider *pp;
  710 
  711         gp = dp->d_geom;
  712         if (gp != NULL) {
  713                 pp = LIST_FIRST(&gp->provider);
  714                 if (pp != NULL) {
  715                         KASSERT(LIST_NEXT(pp, provider) == NULL,
  716                             ("geom %p has more than one provider", gp));
  717                         g_wither_provider(pp, ENXIO);
  718                 }
  719         }
  720 }
  721 
  722 void
  723 disk_attr_changed(struct disk *dp, const char *attr, int flag)
  724 {
  725         struct g_geom *gp;
  726         struct g_provider *pp;
  727 
  728         gp = dp->d_geom;
  729         if (gp != NULL)
  730                 LIST_FOREACH(pp, &gp->provider, provider)
  731                         (void)g_attr_changed(pp, attr, flag);
  732 }
  733 
  734 void
  735 disk_media_changed(struct disk *dp, int flag)
  736 {
  737         struct g_geom *gp;
  738         struct g_provider *pp;
  739 
  740         gp = dp->d_geom;
  741         if (gp != NULL) {
  742                 pp = LIST_FIRST(&gp->provider);
  743                 if (pp != NULL) {
  744                         KASSERT(LIST_NEXT(pp, provider) == NULL,
  745                             ("geom %p has more than one provider", gp));
  746                         g_media_changed(pp, flag);
  747                 }
  748         }
  749 }
  750 
  751 void
  752 disk_media_gone(struct disk *dp, int flag)
  753 {
  754         struct g_geom *gp;
  755         struct g_provider *pp;
  756 
  757         gp = dp->d_geom;
  758         if (gp != NULL) {
  759                 pp = LIST_FIRST(&gp->provider);
  760                 if (pp != NULL) {
  761                         KASSERT(LIST_NEXT(pp, provider) == NULL,
  762                             ("geom %p has more than one provider", gp));
  763                         g_media_gone(pp, flag);
  764                 }
  765         }
  766 }
  767 
  768 int
  769 disk_resize(struct disk *dp, int flag)
  770 {
  771 
  772         if (dp->d_destroyed || dp->d_geom == NULL)
  773                 return (0);
  774 
  775         return (g_post_event(g_disk_resize, dp, flag, NULL));
  776 }
  777 
  778 static void
  779 g_kern_disks(void *p, int flag __unused)
  780 {
  781         struct sbuf *sb;
  782         struct g_geom *gp;
  783         char *sp;
  784 
  785         sb = p;
  786         sp = "";
  787         g_topology_assert();
  788         LIST_FOREACH(gp, &g_disk_class.geom, geom) {
  789                 sbuf_printf(sb, "%s%s", sp, gp->name);
  790                 sp = " ";
  791         }
  792         sbuf_finish(sb);
  793 }
  794 
  795 static int
  796 sysctl_disks(SYSCTL_HANDLER_ARGS)
  797 {
  798         int error;
  799         struct sbuf *sb;
  800 
  801         sb = sbuf_new_auto();
  802         g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
  803         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  804         sbuf_delete(sb);
  805         return error;
  806 }
  807  
  808 SYSCTL_PROC(_kern, OID_AUTO, disks,
  809     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
  810     sysctl_disks, "A", "names of available disks");

Cache object: 6cba4dc9bb0d9ab1ba366fbe2f4b1929


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