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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2002 Poul-Henning Kamp
    5  * Copyright (c) 2002 Networks Associates Technology, Inc.
    6  * All rights reserved.
    7  *
    8  * This software was developed for the FreeBSD Project by Poul-Henning Kamp
    9  * and NAI Labs, the Security Research Division of Network Associates, Inc.
   10  * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
   11  * DARPA CHATS research program.
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  * 3. The names of the authors may not be used to endorse or promote
   22  *    products derived from this software without specific prior written
   23  *    permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  */
   37 
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD$");
   40 
   41 #include "opt_geom.h"
   42 
   43 #include <sys/param.h>
   44 #include <sys/systm.h>
   45 #include <sys/kernel.h>
   46 #include <sys/sysctl.h>
   47 #include <sys/bio.h>
   48 #include <sys/ctype.h>
   49 #include <sys/devctl.h>
   50 #include <sys/fcntl.h>
   51 #include <sys/malloc.h>
   52 #include <sys/msan.h>
   53 #include <sys/sbuf.h>
   54 #include <sys/devicestat.h>
   55 
   56 #include <sys/lock.h>
   57 #include <sys/mutex.h>
   58 #include <geom/geom.h>
   59 #include <geom/geom_disk.h>
   60 #include <geom/geom_int.h>
   61 
   62 #include <dev/led/led.h>
   63 
   64 #include <machine/bus.h>
   65 
   66 struct g_disk_softc {
   67         struct disk             *dp;
   68         struct devstat          *d_devstat;
   69         struct sysctl_ctx_list  sysctl_ctx;
   70         struct sysctl_oid       *sysctl_tree;
   71         char                    led[64];
   72         uint32_t                state;
   73         struct mtx               done_mtx;
   74 };
   75 
   76 static g_access_t g_disk_access;
   77 static g_start_t g_disk_start;
   78 static g_ioctl_t g_disk_ioctl;
   79 static g_dumpconf_t g_disk_dumpconf;
   80 static g_provgone_t g_disk_providergone;
   81 
   82 static int g_disk_sysctl_flags(SYSCTL_HANDLER_ARGS);
   83 
   84 static struct g_class g_disk_class = {
   85         .name = G_DISK_CLASS_NAME,
   86         .version = G_VERSION,
   87         .start = g_disk_start,
   88         .access = g_disk_access,
   89         .ioctl = g_disk_ioctl,
   90         .providergone = g_disk_providergone,
   91         .dumpconf = g_disk_dumpconf,
   92 };
   93 
   94 SYSCTL_DECL(_kern_geom);
   95 static SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
   96     "GEOM_DISK stuff");
   97 
   98 DECLARE_GEOM_CLASS(g_disk_class, g_disk);
   99 
  100 static int
  101 g_disk_access(struct g_provider *pp, int r, int w, int e)
  102 {
  103         struct disk *dp;
  104         struct g_disk_softc *sc;
  105         int error;
  106 
  107         g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
  108             pp->name, r, w, e);
  109         g_topology_assert();
  110         sc = pp->private;
  111         if ((dp = sc->dp) == NULL || dp->d_destroyed) {
  112                 /*
  113                  * Allow decreasing access count even if disk is not
  114                  * available anymore.
  115                  */
  116                 if (r <= 0 && w <= 0 && e <= 0)
  117                         return (0);
  118                 return (ENXIO);
  119         }
  120         r += pp->acr;
  121         w += pp->acw;
  122         e += pp->ace;
  123         error = 0;
  124         if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
  125                 /*
  126                  * It would be better to defer this decision to d_open if
  127                  * it was able to take flags.
  128                  */
  129                 if (w > 0 && (dp->d_flags & DISKFLAG_WRITE_PROTECT) != 0)
  130                         error = EROFS;
  131                 if (error == 0 && dp->d_open != NULL)
  132                         error = dp->d_open(dp);
  133                 if (bootverbose && error != 0)
  134                         printf("Opened disk %s -> %d\n", pp->name, error);
  135                 if (error != 0)
  136                         return (error);
  137                 pp->sectorsize = dp->d_sectorsize;
  138                 if (dp->d_maxsize == 0) {
  139                         printf("WARNING: Disk drive %s%d has no d_maxsize\n",
  140                             dp->d_name, dp->d_unit);
  141                         dp->d_maxsize = DFLTPHYS;
  142                 }
  143                 if (dp->d_delmaxsize == 0) {
  144                         if (bootverbose && dp->d_flags & DISKFLAG_CANDELETE) {
  145                                 printf("WARNING: Disk drive %s%d has no "
  146                                     "d_delmaxsize\n", dp->d_name, dp->d_unit);
  147                         }
  148                         dp->d_delmaxsize = dp->d_maxsize;
  149                 }
  150                 pp->stripeoffset = dp->d_stripeoffset;
  151                 pp->stripesize = dp->d_stripesize;
  152                 dp->d_flags |= DISKFLAG_OPEN;
  153                 /*
  154                  * Do not invoke resize event when initial size was zero.
  155                  * Some disks report its size only after first opening.
  156                  */
  157                 if (pp->mediasize == 0)
  158                         pp->mediasize = dp->d_mediasize;
  159                 else
  160                         g_resize_provider(pp, dp->d_mediasize);
  161         } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
  162                 if (dp->d_close != NULL) {
  163                         error = dp->d_close(dp);
  164                         if (error != 0)
  165                                 printf("Closed disk %s -> %d\n",
  166                                     pp->name, error);
  167                 }
  168                 sc->state = G_STATE_ACTIVE;
  169                 if (sc->led[0] != 0)
  170                         led_set(sc->led, "");
  171                 dp->d_flags &= ~DISKFLAG_OPEN;
  172         }
  173         return (error);
  174 }
  175 
  176 static void
  177 g_disk_kerneldump(struct bio *bp, struct disk *dp)
  178 {
  179         struct g_kerneldump *gkd;
  180         struct g_geom *gp;
  181 
  182         gkd = (struct g_kerneldump*)bp->bio_data;
  183         gp = bp->bio_to->geom;
  184         g_trace(G_T_TOPOLOGY, "g_disk_kerneldump(%s, %jd, %jd)",
  185                 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
  186         if (dp->d_dump == NULL) {
  187                 g_io_deliver(bp, ENODEV);
  188                 return;
  189         }
  190         gkd->di.dumper = dp->d_dump;
  191         gkd->di.priv = dp;
  192         gkd->di.blocksize = dp->d_sectorsize;
  193         gkd->di.maxiosize = dp->d_maxsize;
  194         gkd->di.mediaoffset = gkd->offset;
  195         if ((gkd->offset + gkd->length) > dp->d_mediasize)
  196                 gkd->length = dp->d_mediasize - gkd->offset;
  197         gkd->di.mediasize = gkd->length;
  198         g_io_deliver(bp, 0);
  199 }
  200 
  201 static void
  202 g_disk_setstate(struct bio *bp, struct g_disk_softc *sc)
  203 {
  204         const char *cmd;
  205 
  206         memcpy(&sc->state, bp->bio_data, sizeof(sc->state));
  207         if (sc->led[0] != 0) {
  208                 switch (sc->state) {
  209                 case G_STATE_FAILED:
  210                         cmd = "1";
  211                         break;
  212                 case G_STATE_REBUILD:
  213                         cmd = "f5";
  214                         break;
  215                 case G_STATE_RESYNC:
  216                         cmd = "f1";
  217                         break;
  218                 default:
  219                         cmd = "";
  220                         break;
  221                 }
  222                 led_set(sc->led, cmd);
  223         }
  224         g_io_deliver(bp, 0);
  225 }
  226 
  227 static void
  228 g_disk_done(struct bio *bp)
  229 {
  230         struct bintime now;
  231         struct bio *bp2;
  232         struct g_disk_softc *sc;
  233 
  234         /* See "notes" for why we need a mutex here */
  235         sc = bp->bio_caller1;
  236         bp2 = bp->bio_parent;
  237         binuptime(&now);
  238         mtx_lock(&sc->done_mtx);
  239         if (bp2->bio_error == 0)
  240                 bp2->bio_error = bp->bio_error;
  241         bp2->bio_completed += bp->bio_length - bp->bio_resid;
  242 
  243         if (bp->bio_cmd == BIO_READ)
  244                 kmsan_check(bp2->bio_data, bp2->bio_completed, "g_disk_done");
  245 
  246         switch (bp->bio_cmd) {
  247         case BIO_ZONE:
  248                 bcopy(&bp->bio_zone, &bp2->bio_zone, sizeof(bp->bio_zone));
  249                 /*FALLTHROUGH*/
  250         case BIO_READ:
  251         case BIO_WRITE:
  252         case BIO_DELETE:
  253         case BIO_FLUSH:
  254                 devstat_end_transaction_bio_bt(sc->d_devstat, bp, &now);
  255                 break;
  256         default:
  257                 break;
  258         }
  259         bp2->bio_inbed++;
  260         if (bp2->bio_children == bp2->bio_inbed) {
  261                 mtx_unlock(&sc->done_mtx);
  262                 bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
  263                 g_io_deliver(bp2, bp2->bio_error);
  264         } else
  265                 mtx_unlock(&sc->done_mtx);
  266         g_destroy_bio(bp);
  267 }
  268 
  269 static int
  270 g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
  271 {
  272         struct disk *dp;
  273         struct g_disk_softc *sc;
  274 
  275         sc = pp->private;
  276         dp = sc->dp;
  277         KASSERT(dp != NULL && !dp->d_destroyed,
  278             ("g_disk_ioctl(%lx) on destroyed disk %s", cmd, pp->name));
  279 
  280         if (dp->d_ioctl == NULL)
  281                 return (ENOIOCTL);
  282         return (dp->d_ioctl(dp, cmd, data, fflag, td));
  283 }
  284 
  285 static off_t
  286 g_disk_maxsize(struct disk *dp, struct bio *bp)
  287 {
  288         if (bp->bio_cmd == BIO_DELETE)
  289                 return (dp->d_delmaxsize);
  290         return (dp->d_maxsize);
  291 }
  292 
  293 static int
  294 g_disk_maxsegs(struct disk *dp, struct bio *bp)
  295 {
  296         return ((g_disk_maxsize(dp, bp) / PAGE_SIZE) + 1);
  297 }
  298 
  299 static void
  300 g_disk_advance(struct disk *dp, struct bio *bp, off_t off)
  301 {
  302 
  303         bp->bio_offset += off;
  304         bp->bio_length -= off;
  305 
  306         if ((bp->bio_flags & BIO_VLIST) != 0) {
  307                 bus_dma_segment_t *seg, *end;
  308 
  309                 seg = (bus_dma_segment_t *)bp->bio_data;
  310                 end = (bus_dma_segment_t *)bp->bio_data + bp->bio_ma_n;
  311                 off += bp->bio_ma_offset;
  312                 while (off >= seg->ds_len) {
  313                         KASSERT((seg != end),
  314                             ("vlist request runs off the end"));
  315                         off -= seg->ds_len;
  316                         seg++;
  317                 }
  318                 bp->bio_ma_offset = off;
  319                 bp->bio_ma_n = end - seg;
  320                 bp->bio_data = (void *)seg;
  321         } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
  322                 bp->bio_ma += off / PAGE_SIZE;
  323                 bp->bio_ma_offset += off;
  324                 bp->bio_ma_offset %= PAGE_SIZE;
  325                 bp->bio_ma_n -= off / PAGE_SIZE;
  326         } else {
  327                 bp->bio_data += off;
  328         }
  329 }
  330 
  331 static void
  332 g_disk_seg_limit(bus_dma_segment_t *seg, off_t *poffset,
  333     off_t *plength, int *ppages)
  334 {
  335         uintptr_t seg_page_base;
  336         uintptr_t seg_page_end;
  337         off_t offset;
  338         off_t length;
  339         int seg_pages;
  340 
  341         offset = *poffset;
  342         length = *plength;
  343 
  344         if (length > seg->ds_len - offset)
  345                 length = seg->ds_len - offset;
  346 
  347         seg_page_base = trunc_page(seg->ds_addr + offset);
  348         seg_page_end  = round_page(seg->ds_addr + offset + length);
  349         seg_pages = (seg_page_end - seg_page_base) >> PAGE_SHIFT;
  350 
  351         if (seg_pages > *ppages) {
  352                 seg_pages = *ppages;
  353                 length = (seg_page_base + (seg_pages << PAGE_SHIFT)) -
  354                     (seg->ds_addr + offset);
  355         }
  356 
  357         *poffset = 0;
  358         *plength -= length;
  359         *ppages -= seg_pages;
  360 }
  361 
  362 static off_t
  363 g_disk_vlist_limit(struct disk *dp, struct bio *bp, bus_dma_segment_t **pendseg)
  364 {
  365         bus_dma_segment_t *seg, *end __diagused;
  366         off_t residual;
  367         off_t offset;
  368         int pages;
  369 
  370         seg = (bus_dma_segment_t *)bp->bio_data;
  371         end = (bus_dma_segment_t *)bp->bio_data + bp->bio_ma_n;
  372         residual = bp->bio_length;
  373         offset = bp->bio_ma_offset;
  374         pages = g_disk_maxsegs(dp, bp);
  375         while (residual != 0 && pages != 0) {
  376                 KASSERT((seg != end),
  377                     ("vlist limit runs off the end"));
  378                 g_disk_seg_limit(seg, &offset, &residual, &pages);
  379                 seg++;
  380         }
  381         if (pendseg != NULL)
  382                 *pendseg = seg;
  383         return (residual);
  384 }
  385 
  386 static bool
  387 g_disk_limit(struct disk *dp, struct bio *bp)
  388 {
  389         bool limited = false;
  390         off_t maxsz;
  391 
  392         maxsz = g_disk_maxsize(dp, bp);
  393 
  394         /*
  395          * XXX: If we have a stripesize we should really use it here.
  396          *      Care should be taken in the delete case if this is done
  397          *      as deletes can be very sensitive to size given how they
  398          *      are processed.
  399          */
  400         if (bp->bio_length > maxsz) {
  401                 bp->bio_length = maxsz;
  402                 limited = true;
  403         }
  404 
  405         if ((bp->bio_flags & BIO_VLIST) != 0) {
  406                 bus_dma_segment_t *firstseg, *endseg;
  407                 off_t residual;
  408 
  409                 firstseg = (bus_dma_segment_t*)bp->bio_data;
  410                 residual = g_disk_vlist_limit(dp, bp, &endseg);
  411                 if (residual != 0) {
  412                         bp->bio_ma_n = endseg - firstseg;
  413                         bp->bio_length -= residual;
  414                         limited = true;
  415                 }
  416         } else if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
  417                 bp->bio_ma_n =
  418                     howmany(bp->bio_ma_offset + bp->bio_length, PAGE_SIZE);
  419         }
  420 
  421         return (limited);
  422 }
  423 
  424 static void
  425 g_disk_start(struct bio *bp)
  426 {
  427         struct bio *bp2, *bp3;
  428         struct disk *dp;
  429         struct g_disk_softc *sc;
  430         int error;
  431         off_t off;
  432 
  433         biotrack(bp, __func__);
  434 
  435         sc = bp->bio_to->private;
  436         dp = sc->dp;
  437         KASSERT(dp != NULL && !dp->d_destroyed,
  438             ("g_disk_start(%p) on destroyed disk %s", bp, bp->bio_to->name));
  439         error = EJUSTRETURN;
  440         switch(bp->bio_cmd) {
  441         case BIO_DELETE:
  442                 if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
  443                         error = EOPNOTSUPP;
  444                         break;
  445                 }
  446                 /* fall-through */
  447         case BIO_READ:
  448         case BIO_WRITE:
  449                 KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0 ||
  450                     (bp->bio_flags & BIO_UNMAPPED) == 0,
  451                     ("unmapped bio not supported by disk %s", dp->d_name));
  452 
  453                 if (bp->bio_cmd == BIO_WRITE)
  454                         kmsan_check_bio(bp, "g_disk_start");
  455 
  456                 off = 0;
  457                 bp3 = NULL;
  458                 bp2 = g_clone_bio(bp);
  459                 if (bp2 == NULL) {
  460                         error = ENOMEM;
  461                         break;
  462                 }
  463                 for (;;) {
  464                         if (g_disk_limit(dp, bp2)) {
  465                                 off += bp2->bio_length;
  466 
  467                                 /*
  468                                  * To avoid a race, we need to grab the next bio
  469                                  * before we schedule this one.  See "notes".
  470                                  */
  471                                 bp3 = g_clone_bio(bp);
  472                                 if (bp3 == NULL)
  473                                         bp->bio_error = ENOMEM;
  474                         }
  475                         bp2->bio_done = g_disk_done;
  476                         bp2->bio_caller1 = sc;
  477                         bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
  478                         bp2->bio_bcount = bp2->bio_length;
  479                         bp2->bio_disk = dp;
  480                         devstat_start_transaction_bio(dp->d_devstat, bp2);
  481                         dp->d_strategy(bp2);
  482 
  483                         if (bp3 == NULL)
  484                                 break;
  485 
  486                         bp2 = bp3;
  487                         bp3 = NULL;
  488                         g_disk_advance(dp, bp2, off);
  489                 }
  490                 break;
  491         case BIO_GETATTR:
  492                 /* Give the driver a chance to override */
  493                 if (dp->d_getattr != NULL) {
  494                         if (bp->bio_disk == NULL)
  495                                 bp->bio_disk = dp;
  496                         error = dp->d_getattr(bp);
  497                         if (error != -1)
  498                                 break;
  499                         error = EJUSTRETURN;
  500                 }
  501                 if (g_handleattr_int(bp, "GEOM::candelete",
  502                     (dp->d_flags & DISKFLAG_CANDELETE) != 0))
  503                         break;
  504                 else if (g_handleattr_int(bp, "GEOM::fwsectors",
  505                     dp->d_fwsectors))
  506                         break;
  507                 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
  508                         break;
  509                 else if (g_handleattr_str(bp, "GEOM::ident", dp->d_ident))
  510                         break;
  511                 else if (g_handleattr_str(bp, "GEOM::descr", dp->d_descr))
  512                         break;
  513                 else if (g_handleattr_uint16_t(bp, "GEOM::hba_vendor",
  514                     dp->d_hba_vendor))
  515                         break;
  516                 else if (g_handleattr_uint16_t(bp, "GEOM::hba_device",
  517                     dp->d_hba_device))
  518                         break;
  519                 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subvendor",
  520                     dp->d_hba_subvendor))
  521                         break;
  522                 else if (g_handleattr_uint16_t(bp, "GEOM::hba_subdevice",
  523                     dp->d_hba_subdevice))
  524                         break;
  525                 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
  526                         g_disk_kerneldump(bp, dp);
  527                 else if (!strcmp(bp->bio_attribute, "GEOM::setstate"))
  528                         g_disk_setstate(bp, sc);
  529                 else if (g_handleattr_uint16_t(bp, "GEOM::rotation_rate",
  530                     dp->d_rotation_rate))
  531                         break;
  532                 else if (g_handleattr_str(bp, "GEOM::attachment",
  533                     dp->d_attachment))
  534                         break;
  535                 else
  536                         error = ENOIOCTL;
  537                 break;
  538         case BIO_FLUSH:
  539                 g_trace(G_T_BIO, "g_disk_flushcache(%s)",
  540                     bp->bio_to->name);
  541                 if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) {
  542                         error = EOPNOTSUPP;
  543                         break;
  544                 }
  545                 /*FALLTHROUGH*/
  546         case BIO_ZONE:
  547                 if (bp->bio_cmd == BIO_ZONE) {
  548                         if (!(dp->d_flags & DISKFLAG_CANZONE)) {
  549                                 error = EOPNOTSUPP;
  550                                 break;
  551                         }
  552                         g_trace(G_T_BIO, "g_disk_zone(%s)",
  553                             bp->bio_to->name);
  554                 }
  555                 bp2 = g_clone_bio(bp);
  556                 if (bp2 == NULL) {
  557                         g_io_deliver(bp, ENOMEM);
  558                         return;
  559                 }
  560                 bp2->bio_done = g_disk_done;
  561                 bp2->bio_caller1 = sc;
  562                 bp2->bio_disk = dp;
  563                 devstat_start_transaction_bio(dp->d_devstat, bp2);
  564                 dp->d_strategy(bp2);
  565                 break;
  566         case BIO_SPEEDUP:
  567                 bp2 = g_clone_bio(bp);
  568                 if (bp2 == NULL) {
  569                         g_io_deliver(bp, ENOMEM);
  570                         return;
  571                 }
  572                 bp2->bio_done = g_disk_done;
  573                 bp2->bio_caller1 = sc;
  574                 bp2->bio_disk = dp;
  575                 dp->d_strategy(bp2);
  576                 break;
  577         default:
  578                 error = EOPNOTSUPP;
  579                 break;
  580         }
  581         if (error != EJUSTRETURN)
  582                 g_io_deliver(bp, error);
  583         return;
  584 }
  585 
  586 static void
  587 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
  588 {
  589         struct bio *bp;
  590         struct disk *dp;
  591         struct g_disk_softc *sc;
  592         char *buf;
  593         int res = 0;
  594 
  595         sc = gp->softc;
  596         if (sc == NULL || (dp = sc->dp) == NULL)
  597                 return;
  598         if (indent == NULL) {
  599                 sbuf_printf(sb, " hd %u", dp->d_fwheads);
  600                 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
  601                 return;
  602         }
  603         if (pp != NULL) {
  604                 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
  605                     indent, dp->d_fwheads);
  606                 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
  607                     indent, dp->d_fwsectors);
  608 
  609                 /*
  610                  * "rotationrate" is a little complicated, because the value
  611                  * returned by the drive might not be the RPM; 0 and 1 are
  612                  * special cases, and there's also a valid range.
  613                  */
  614                 sbuf_printf(sb, "%s<rotationrate>", indent);
  615                 if (dp->d_rotation_rate == DISK_RR_UNKNOWN) /* Old drives */
  616                         sbuf_cat(sb, "unknown");        /* don't report RPM. */
  617                 else if (dp->d_rotation_rate == DISK_RR_NON_ROTATING)
  618                         sbuf_cat(sb, "");
  619                 else if ((dp->d_rotation_rate >= DISK_RR_MIN) &&
  620                     (dp->d_rotation_rate <= DISK_RR_MAX))
  621                         sbuf_printf(sb, "%u", dp->d_rotation_rate);
  622                 else
  623                         sbuf_cat(sb, "invalid");
  624                 sbuf_cat(sb, "</rotationrate>\n");
  625                 if (dp->d_getattr != NULL) {
  626                         buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK);
  627                         bp = g_alloc_bio();
  628                         bp->bio_disk = dp;
  629                         bp->bio_attribute = "GEOM::ident";
  630                         bp->bio_length = DISK_IDENT_SIZE;
  631                         bp->bio_data = buf;
  632                         res = dp->d_getattr(bp);
  633                         sbuf_printf(sb, "%s<ident>", indent);
  634                         g_conf_cat_escaped(sb, res == 0 ? buf : dp->d_ident);
  635                         sbuf_cat(sb, "</ident>\n");
  636                         bp->bio_attribute = "GEOM::lunid";
  637                         bp->bio_length = DISK_IDENT_SIZE;
  638                         bp->bio_data = buf;
  639                         if (dp->d_getattr(bp) == 0) {
  640                                 sbuf_printf(sb, "%s<lunid>", indent);
  641                                 g_conf_cat_escaped(sb, buf);
  642                                 sbuf_cat(sb, "</lunid>\n");
  643                         }
  644                         bp->bio_attribute = "GEOM::lunname";
  645                         bp->bio_length = DISK_IDENT_SIZE;
  646                         bp->bio_data = buf;
  647                         if (dp->d_getattr(bp) == 0) {
  648                                 sbuf_printf(sb, "%s<lunname>", indent);
  649                                 g_conf_cat_escaped(sb, buf);
  650                                 sbuf_cat(sb, "</lunname>\n");
  651                         }
  652                         g_destroy_bio(bp);
  653                         g_free(buf);
  654                 } else {
  655                         sbuf_printf(sb, "%s<ident>", indent);
  656                         g_conf_cat_escaped(sb, dp->d_ident);
  657                         sbuf_cat(sb, "</ident>\n");
  658                 }
  659                 sbuf_printf(sb, "%s<descr>", indent);
  660                 g_conf_cat_escaped(sb, dp->d_descr);
  661                 sbuf_cat(sb, "</descr>\n");
  662         }
  663 }
  664 
  665 static void
  666 g_disk_resize(void *ptr, int flag)
  667 {
  668         struct disk *dp;
  669         struct g_geom *gp;
  670         struct g_provider *pp;
  671 
  672         if (flag == EV_CANCEL)
  673                 return;
  674         g_topology_assert();
  675 
  676         dp = ptr;
  677         gp = dp->d_geom;
  678 
  679         if (dp->d_destroyed || gp == NULL)
  680                 return;
  681 
  682         LIST_FOREACH(pp, &gp->provider, provider) {
  683                 if (pp->sectorsize != 0 &&
  684                     pp->sectorsize != dp->d_sectorsize)
  685                         g_wither_provider(pp, ENXIO);
  686                 else
  687                         g_resize_provider(pp, dp->d_mediasize);
  688         }
  689 }
  690 
  691 static void
  692 g_disk_create(void *arg, int flag)
  693 {
  694         struct g_geom *gp;
  695         struct g_provider *pp;
  696         struct disk *dp;
  697         struct g_disk_softc *sc;
  698         struct disk_alias *dap;
  699         char tmpstr[80];
  700 
  701         if (flag == EV_CANCEL)
  702                 return;
  703         g_topology_assert();
  704         dp = arg;
  705 
  706         mtx_pool_lock(mtxpool_sleep, dp);
  707         dp->d_init_level = DISK_INIT_START;
  708 
  709         /*
  710          * If the disk has already gone away, we can just stop here and
  711          * call the user's callback to tell him we've cleaned things up.
  712          */
  713         if (dp->d_goneflag != 0) {
  714                 mtx_pool_unlock(mtxpool_sleep, dp);
  715                 if (dp->d_gone != NULL)
  716                         dp->d_gone(dp);
  717                 return;
  718         }
  719         mtx_pool_unlock(mtxpool_sleep, dp);
  720 
  721         sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
  722         mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF);
  723         sc->dp = dp;
  724         if (dp->d_devstat == NULL) {
  725                 dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
  726                     dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
  727                     DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
  728         }
  729         sc->d_devstat = dp->d_devstat;
  730         gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
  731         gp->softc = sc;
  732         pp = g_new_providerf(gp, "%s", gp->name);
  733         LIST_FOREACH(dap, &dp->d_aliases, da_next)
  734                 g_provider_add_alias(pp, "%s%d", dap->da_alias, dp->d_unit);
  735         devstat_remove_entry(pp->stat);
  736         pp->stat = NULL;
  737         dp->d_devstat->id = pp;
  738         pp->mediasize = dp->d_mediasize;
  739         pp->sectorsize = dp->d_sectorsize;
  740         pp->stripeoffset = dp->d_stripeoffset;
  741         pp->stripesize = dp->d_stripesize;
  742         if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0)
  743                 pp->flags |= G_PF_ACCEPT_UNMAPPED;
  744         if ((dp->d_flags & DISKFLAG_DIRECT_COMPLETION) != 0)
  745                 pp->flags |= G_PF_DIRECT_SEND;
  746         pp->flags |= G_PF_DIRECT_RECEIVE;
  747         if (bootverbose)
  748                 printf("GEOM: new disk %s\n", gp->name);
  749         sysctl_ctx_init(&sc->sysctl_ctx);
  750         snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name);
  751         sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
  752                 SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name,
  753                 CTLFLAG_RD | CTLFLAG_MPSAFE, 0, tmpstr);
  754         if (sc->sysctl_tree != NULL) {
  755                 SYSCTL_ADD_STRING(&sc->sysctl_ctx,
  756                     SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led",
  757                     CTLFLAG_RWTUN, sc->led, sizeof(sc->led),
  758                     "LED name");
  759                 SYSCTL_ADD_PROC(&sc->sysctl_ctx,
  760                     SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "flags",
  761                     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, dp, 0,
  762                     g_disk_sysctl_flags, "A", "Report disk flags");
  763         }
  764         pp->private = sc;
  765         dp->d_geom = gp;
  766         g_error_provider(pp, 0);
  767 
  768         mtx_pool_lock(mtxpool_sleep, dp);
  769         dp->d_init_level = DISK_INIT_DONE;
  770 
  771         /*
  772          * If the disk has gone away at this stage, start the withering
  773          * process for it.
  774          */
  775         if (dp->d_goneflag != 0) {
  776                 mtx_pool_unlock(mtxpool_sleep, dp);
  777                 g_wither_provider(pp, ENXIO);
  778                 return;
  779         }
  780         mtx_pool_unlock(mtxpool_sleep, dp);
  781 
  782 }
  783 
  784 /*
  785  * We get this callback after all of the consumers have gone away, and just
  786  * before the provider is freed.  If the disk driver provided a d_gone
  787  * callback, let them know that it is okay to free resources -- they won't
  788  * be getting any more accesses from GEOM.
  789  */
  790 static void
  791 g_disk_providergone(struct g_provider *pp)
  792 {
  793         struct disk *dp;
  794         struct g_disk_softc *sc;
  795 
  796         sc = (struct g_disk_softc *)pp->private;
  797         dp = sc->dp;
  798         if (dp != NULL && dp->d_gone != NULL)
  799                 dp->d_gone(dp);
  800         if (sc->sysctl_tree != NULL) {
  801                 sysctl_ctx_free(&sc->sysctl_ctx);
  802                 sc->sysctl_tree = NULL;
  803         }
  804         if (sc->led[0] != 0) {
  805                 led_set(sc->led, "");
  806                 sc->led[0] = 0;
  807         }
  808         pp->private = NULL;
  809         pp->geom->softc = NULL;
  810         mtx_destroy(&sc->done_mtx);
  811         g_free(sc);
  812 }
  813 
  814 static void
  815 g_disk_destroy(void *ptr, int flag)
  816 {
  817         struct disk *dp;
  818         struct g_geom *gp;
  819         struct g_disk_softc *sc;
  820         struct disk_alias *dap, *daptmp;
  821 
  822         g_topology_assert();
  823         dp = ptr;
  824         gp = dp->d_geom;
  825         if (gp != NULL) {
  826                 sc = gp->softc;
  827                 if (sc != NULL)
  828                         sc->dp = NULL;
  829                 dp->d_geom = NULL;
  830                 g_wither_geom(gp, ENXIO);
  831         }
  832         LIST_FOREACH_SAFE(dap, &dp->d_aliases, da_next, daptmp)
  833                 g_free(dap);
  834 
  835         g_free(dp);
  836 }
  837 
  838 /*
  839  * We only allow printable characters in disk ident,
  840  * the rest is converted to 'x<HH>'.
  841  */
  842 static void
  843 g_disk_ident_adjust(char *ident, size_t size)
  844 {
  845         char *p, tmp[4], newid[DISK_IDENT_SIZE];
  846 
  847         newid[0] = '\0';
  848         for (p = ident; *p != '\0'; p++) {
  849                 if (isprint(*p)) {
  850                         tmp[0] = *p;
  851                         tmp[1] = '\0';
  852                 } else {
  853                         snprintf(tmp, sizeof(tmp), "x%02hhx",
  854                             *(unsigned char *)p);
  855                 }
  856                 if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid))
  857                         break;
  858         }
  859         bzero(ident, size);
  860         strlcpy(ident, newid, size);
  861 }
  862 
  863 struct disk *
  864 disk_alloc(void)
  865 {
  866         struct disk *dp;
  867 
  868         dp = g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO);
  869         LIST_INIT(&dp->d_aliases);
  870         dp->d_init_level = DISK_INIT_NONE;
  871         dp->d_cevent = g_alloc_event(M_WAITOK);
  872         dp->d_devent = g_alloc_event(M_WAITOK);
  873         return (dp);
  874 }
  875 
  876 void
  877 disk_create(struct disk *dp, int version)
  878 {
  879 
  880         if (version != DISK_VERSION) {
  881                 printf("WARNING: Attempt to add disk %s%d %s",
  882                     dp->d_name, dp->d_unit,
  883                     " using incompatible ABI version of disk(9)\n");
  884                 printf("WARNING: Ignoring disk %s%d\n",
  885                     dp->d_name, dp->d_unit);
  886                 return;
  887         }
  888         if (dp->d_flags & DISKFLAG_RESERVED) {
  889                 printf("WARNING: Attempt to add non-MPSAFE disk %s%d\n",
  890                     dp->d_name, dp->d_unit);
  891                 printf("WARNING: Ignoring disk %s%d\n",
  892                     dp->d_name, dp->d_unit);
  893                 return;
  894         }
  895         KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
  896         KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
  897         KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
  898         KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
  899         g_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident));
  900 
  901         dp->d_init_level = DISK_INIT_CREATE;
  902 
  903         KASSERT(dp->d_cevent != NULL,
  904             ("Disk create for %p with event NULL", dp));
  905         g_post_event_ep(g_disk_create, dp, dp->d_cevent, dp, NULL);
  906 }
  907 
  908 void
  909 disk_destroy(struct disk *dp)
  910 {
  911         struct disk_alias *dap, *daptmp;
  912 
  913         /* If disk_create() was never called, just free the resources. */
  914         if (dp->d_init_level < DISK_INIT_CREATE) {
  915                 if (dp->d_devstat != NULL)
  916                         devstat_remove_entry(dp->d_devstat);
  917                 LIST_FOREACH_SAFE(dap, &dp->d_aliases, da_next, daptmp)
  918                         g_free(dap);
  919                 g_free(dp->d_cevent);
  920                 g_free(dp->d_devent);
  921                 g_free(dp);
  922                 return;
  923         }
  924 
  925         KASSERT(dp->d_devent != NULL,
  926             ("Disk destroy for %p with event NULL", dp));
  927         disk_gone(dp);
  928         dp->d_destroyed = 1;
  929         g_cancel_event(dp);
  930         if (dp->d_devstat != NULL)
  931                 devstat_remove_entry(dp->d_devstat);
  932         g_post_event_ep(g_disk_destroy, dp, dp->d_devent, NULL);
  933 }
  934 
  935 void
  936 disk_add_alias(struct disk *dp, const char *name)
  937 {
  938         struct disk_alias *dap;
  939 
  940         dap = (struct disk_alias *)g_malloc(
  941                 sizeof(struct disk_alias) + strlen(name) + 1, M_WAITOK);
  942         strcpy((char *)(dap + 1), name);
  943         dap->da_alias = (const char *)(dap + 1);
  944         LIST_INSERT_HEAD(&dp->d_aliases, dap, da_next);
  945 }
  946 
  947 void
  948 disk_gone(struct disk *dp)
  949 {
  950         struct g_geom *gp;
  951         struct g_provider *pp;
  952 
  953         mtx_pool_lock(mtxpool_sleep, dp);
  954 
  955         /*
  956          * Second wither call makes no sense, plus we can not access the list
  957          * of providers without topology lock after calling wither once.
  958          */
  959         if (dp->d_goneflag != 0) {
  960                 mtx_pool_unlock(mtxpool_sleep, dp);
  961                 return;
  962         }
  963 
  964         dp->d_goneflag = 1;
  965 
  966         /*
  967          * If we're still in the process of creating this disk (the
  968          * g_disk_create() function is still queued, or is in
  969          * progress), the init level will not yet be DISK_INIT_DONE.
  970          *
  971          * If that is the case, g_disk_create() will see d_goneflag
  972          * and take care of cleaning things up.
  973          *
  974          * If the disk has already been created, we default to
  975          * withering the provider as usual below.
  976          *
  977          * If the caller has not set a d_gone() callback, he will
  978          * not be any worse off by returning here, because the geom
  979          * has not been fully setup in any case.
  980          */
  981         if (dp->d_init_level < DISK_INIT_DONE) {
  982                 mtx_pool_unlock(mtxpool_sleep, dp);
  983                 return;
  984         }
  985         mtx_pool_unlock(mtxpool_sleep, dp);
  986 
  987         gp = dp->d_geom;
  988         pp = LIST_FIRST(&gp->provider);
  989         if (pp != NULL) {
  990                 KASSERT(LIST_NEXT(pp, provider) == NULL,
  991                     ("geom %p has more than one provider", gp));
  992                 g_wither_provider(pp, ENXIO);
  993         }
  994 }
  995 
  996 void
  997 disk_attr_changed(struct disk *dp, const char *attr, int flag)
  998 {
  999         struct g_geom *gp = dp->d_geom;
 1000         struct g_provider *pp;
 1001         char devnamebuf[128];
 1002 
 1003         if (gp == NULL)
 1004                 return;
 1005         LIST_FOREACH(pp, &gp->provider, provider)
 1006                 (void)g_attr_changed(pp, attr, flag);
 1007         snprintf(devnamebuf, sizeof(devnamebuf), "devname=%s%d", dp->d_name,
 1008             dp->d_unit);
 1009         devctl_notify("GEOM", "disk", attr, devnamebuf);
 1010 }
 1011 
 1012 void
 1013 disk_media_changed(struct disk *dp, int flag)
 1014 {
 1015         struct g_geom *gp = dp->d_geom;
 1016         struct g_provider *pp;
 1017 
 1018         if (gp == NULL)
 1019                 return;
 1020         pp = LIST_FIRST(&gp->provider);
 1021         if (pp != NULL) {
 1022                 KASSERT(LIST_NEXT(pp, provider) == NULL,
 1023                     ("geom %p has more than one provider", gp));
 1024                 g_media_changed(pp, flag);
 1025         }
 1026 }
 1027 
 1028 void
 1029 disk_media_gone(struct disk *dp, int flag)
 1030 {
 1031         struct g_geom *gp = dp->d_geom;
 1032         struct g_provider *pp;
 1033 
 1034         if (gp == NULL)
 1035                 return;
 1036         pp = LIST_FIRST(&gp->provider);
 1037         if (pp != NULL) {
 1038                 KASSERT(LIST_NEXT(pp, provider) == NULL,
 1039                     ("geom %p has more than one provider", gp));
 1040                 g_media_gone(pp, flag);
 1041         }
 1042 }
 1043 
 1044 int
 1045 disk_resize(struct disk *dp, int flag)
 1046 {
 1047 
 1048         if (dp->d_destroyed || dp->d_geom == NULL)
 1049                 return (0);
 1050 
 1051         return (g_post_event(g_disk_resize, dp, flag, NULL));
 1052 }
 1053 
 1054 static void
 1055 g_kern_disks(void *p, int flag __unused)
 1056 {
 1057         struct sbuf *sb;
 1058         struct g_geom *gp;
 1059         char *sp;
 1060 
 1061         sb = p;
 1062         sp = "";
 1063         g_topology_assert();
 1064         LIST_FOREACH(gp, &g_disk_class.geom, geom) {
 1065                 sbuf_printf(sb, "%s%s", sp, gp->name);
 1066                 sp = " ";
 1067         }
 1068         sbuf_finish(sb);
 1069 }
 1070 
 1071 static int
 1072 g_disk_sysctl_flags(SYSCTL_HANDLER_ARGS)
 1073 {
 1074         struct disk *dp;
 1075         struct sbuf *sb;
 1076         int error;
 1077 
 1078         sb = sbuf_new_auto();
 1079         dp = (struct disk *)arg1;
 1080         sbuf_printf(sb, "%b", dp->d_flags,
 1081                 "\2"
 1082                 "\2OPEN"
 1083                 "\3CANDELETE"
 1084                 "\4CANFLUSHCACHE"
 1085                 "\5UNMAPPEDBIO"
 1086                 "\6DIRECTCOMPLETION"
 1087                 "\10CANZONE"
 1088                 "\11WRITEPROTECT");
 1089 
 1090         sbuf_finish(sb);
 1091         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
 1092         sbuf_delete(sb);
 1093         return (error);
 1094 }
 1095 
 1096 static int
 1097 sysctl_disks(SYSCTL_HANDLER_ARGS)
 1098 {
 1099         int error;
 1100         struct sbuf *sb;
 1101 
 1102         sb = sbuf_new_auto();
 1103         g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
 1104         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
 1105         sbuf_delete(sb);
 1106         return error;
 1107 }
 1108 
 1109 SYSCTL_PROC(_kern, OID_AUTO, disks,
 1110     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
 1111     sysctl_disks, "A", "names of available disks");

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