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  * $FreeBSD: releng/5.0/sys/geom/geom_disk.c 108141 2002-12-20 21:52:03Z phk $
   36  */
   37 
   38 #include "opt_geom.h"
   39 #ifndef NO_GEOM
   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/conf.h>
   47 #include <sys/disk.h>
   48 #include <sys/diskslice.h>
   49 #include <sys/disklabel.h>
   50 #include <sys/malloc.h>
   51 #include <sys/sysctl.h>
   52 #include <sys/stdint.h>
   53 #include <machine/md_var.h>
   54 
   55 
   56 #include <sys/lock.h>
   57 #include <sys/mutex.h>
   58 #include <geom/geom.h>
   59 
   60 static g_access_t g_disk_access;
   61 
   62 struct g_class g_disk_class = {
   63         "DISK",
   64         NULL,
   65         NULL,
   66         G_CLASS_INITIALIZER
   67 };
   68 
   69 DECLARE_GEOM_CLASS(g_disk_class, g_disk);
   70 
   71 static int
   72 g_disk_access(struct g_provider *pp, int r, int w, int e)
   73 {
   74         struct disk *dp;
   75         dev_t dev;
   76         int error;
   77 
   78         g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
   79             pp->name, r, w, e);
   80         g_topology_assert();
   81         r += pp->acr;
   82         w += pp->acw;
   83         e += pp->ace;
   84         dp = pp->geom->softc;
   85         dev = dp->d_dev;
   86         if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
   87                 mtx_lock(&Giant);
   88                 error = devsw(dev)->d_open(dev, 3, 0, NULL);
   89                 if (error != 0)
   90                         printf("Opened disk %s -> %d\n", pp->name, error);
   91                 mtx_unlock(&Giant);
   92                 pp->mediasize = dp->d_mediasize;
   93                 pp->sectorsize = dp->d_sectorsize;
   94         } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
   95                 mtx_lock(&Giant);
   96                 error = devsw(dev)->d_close(dev, 3, 0, NULL);
   97                 if (error != 0)
   98                         printf("Closed disk %s -> %d\n", pp->name, error);
   99                 mtx_unlock(&Giant);
  100         } else {
  101                 error = 0;
  102         }
  103         return (error);
  104 }
  105 
  106 static void
  107 g_disk_kerneldump(struct bio *bp, struct disk *dp)
  108 { 
  109         int error;
  110         struct g_kerneldump *gkd;
  111         struct dumperinfo di;
  112         struct g_geom *gp;
  113 
  114         gkd = (struct g_kerneldump*)bp->bio_data;
  115         gp = bp->bio_to->geom;
  116         g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)",
  117                 gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
  118         di.dumper = (dumper_t *)dp->d_devsw->d_dump;
  119         di.priv = dp->d_dev;
  120         di.blocksize = dp->d_sectorsize;
  121         di.mediaoffset = gkd->offset;
  122         di.mediasize = gkd->length;
  123         error = set_dumper(&di);
  124         g_io_deliver(bp, error);
  125 }
  126 
  127 static void
  128 g_disk_done(struct bio *bp)
  129 {
  130 
  131         mtx_unlock(&Giant);
  132         bp->bio_completed = bp->bio_length - bp->bio_resid;
  133         g_std_done(bp);
  134         mtx_lock(&Giant);
  135 }
  136 
  137 static void
  138 g_disk_start(struct bio *bp)
  139 {
  140         struct bio *bp2;
  141         dev_t dev;
  142         struct disk *dp;
  143         struct g_ioctl *gio;
  144         int error;
  145 
  146         dp = bp->bio_to->geom->softc;
  147         dev = dp->d_dev;
  148         error = EJUSTRETURN;
  149         switch(bp->bio_cmd) {
  150         case BIO_DELETE:
  151                 if (!(devsw(dev)->d_flags & D_CANFREE)) {
  152                         error = 0;
  153                         break;
  154                 }
  155                 /* fall-through */
  156         case BIO_READ:
  157         case BIO_WRITE:
  158                 bp2 = g_clone_bio(bp);
  159                 bp2->bio_done = g_disk_done;
  160                 bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT;
  161                 bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
  162                 bp2->bio_bcount = bp2->bio_length;
  163                 bp2->bio_dev = dev;
  164                 mtx_lock(&Giant);
  165                 devsw(dev)->d_strategy(bp2);
  166                 mtx_unlock(&Giant);
  167                 break;
  168         case BIO_GETATTR:
  169                 if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors))
  170                         break;
  171                 else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
  172                         break;
  173                 else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
  174                         break;
  175                 else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
  176                         g_disk_kerneldump(bp, dp);
  177                 else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") &&
  178                     bp->bio_length == sizeof *gio) {
  179                         gio = (struct g_ioctl *)bp->bio_data;
  180                         gio->func = devsw(dp->d_dev)->d_ioctl;
  181                         gio->dev =  dp->d_dev;
  182                         error = EDIRIOCTL;
  183                 } else 
  184                         error = ENOIOCTL;
  185                 break;
  186         case BIO_SETATTR:
  187                 if (!strcmp(bp->bio_attribute, "GEOM::ioctl") &&
  188                     bp->bio_length == sizeof *gio) {
  189                         gio = (struct g_ioctl *)bp->bio_data;
  190                         gio->func = devsw(dp->d_dev)->d_ioctl;
  191                         gio->dev =  dp->d_dev;
  192                         error = EDIRIOCTL;
  193                 } else 
  194                         error = ENOIOCTL;
  195                 break;
  196         default:
  197                 error = EOPNOTSUPP;
  198                 break;
  199         }
  200         if (error != EJUSTRETURN)
  201                 g_io_deliver(bp, error);
  202         return;
  203 }
  204 
  205 static void
  206 g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
  207 {
  208         struct disk *dp;
  209 
  210         dp = gp->softc;
  211         if (indent == NULL) {
  212                 sbuf_printf(sb, " hd %u", dp->d_fwheads);
  213                 sbuf_printf(sb, " sc %u", dp->d_fwsectors);
  214                 return;
  215         }
  216         if (pp != NULL) {
  217                 sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
  218                     indent, dp->d_fwheads);
  219                 sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
  220                     indent, dp->d_fwsectors);
  221         }
  222 }
  223 
  224 static void
  225 g_disk_create(void *arg)
  226 {
  227         struct g_geom *gp;
  228         struct g_provider *pp;
  229         dev_t dev;
  230 
  231         g_topology_assert();
  232         dev = arg;
  233         gp = g_new_geomf(&g_disk_class, dev->si_name);
  234         gp->start = g_disk_start;
  235         gp->access = g_disk_access;
  236         gp->softc = dev->si_disk;
  237         gp->dumpconf = g_disk_dumpconf;
  238         dev->si_disk->d_softc = gp;
  239         pp = g_new_providerf(gp, "%s", gp->name);
  240         pp->mediasize = dev->si_disk->d_mediasize;
  241         pp->sectorsize = dev->si_disk->d_sectorsize;
  242         g_error_provider(pp, 0);
  243         if (bootverbose)
  244                 printf("GEOM: new disk %s\n", gp->name);
  245 }
  246 
  247 
  248 
  249 dev_t
  250 disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto)
  251 {
  252         dev_t dev;
  253 
  254         dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO);
  255         dp->d_dev = dev;
  256         dp->d_devsw = cdevsw;
  257         dev->si_devsw = cdevsw;
  258         dev->si_disk = dp;
  259         dev->si_udev = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART);
  260         sprintf(dev->si_name, "%s%d", cdevsw->d_name, unit);
  261         g_call_me(g_disk_create, dev);
  262         return (dev);
  263 }
  264 
  265 void disk_dev_synth(dev_t dev);
  266 
  267 void
  268 disk_dev_synth(dev_t dev)
  269 {
  270 
  271         return;
  272 }
  273 
  274 void
  275 disk_destroy(dev_t dev)
  276 {
  277         struct disk *dp;
  278         struct g_geom *gp;
  279 
  280         dp = dev->si_disk;
  281         gp = dp->d_softc;
  282         g_free(dev);
  283         gp->flags |= G_GEOM_WITHER;
  284         g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO);
  285 }
  286 
  287 void
  288 disk_invalidate (struct disk *disk)
  289 {
  290 }
  291 
  292 static void
  293 g_kern_disks(void *p)
  294 {
  295         struct sbuf *sb;
  296         struct g_geom *gp;
  297         char *sp;
  298 
  299         sb = p;
  300         sp = "";
  301         g_topology_assert();
  302         LIST_FOREACH(gp, &g_disk_class.geom, geom) {
  303                 sbuf_printf(sb, "%s%s", sp, gp->name);
  304                 sp = " ";
  305         }
  306         sbuf_finish(sb);
  307         wakeup(sb);
  308 }
  309 
  310 static int
  311 sysctl_disks(SYSCTL_HANDLER_ARGS)
  312 {
  313         int error;
  314         struct sbuf *sb;
  315 
  316         sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
  317         sbuf_clear(sb);
  318         g_call_me(g_kern_disks, sb);
  319         do {
  320                 tsleep(sb, PZERO, "kern.disks", hz);
  321         } while(!sbuf_done(sb));
  322         error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
  323         sbuf_delete(sb);
  324         return error;
  325 }
  326  
  327 SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 
  328     sysctl_disks, "A", "names of available disks");
  329 
  330 #endif
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FreeBSD/Linux Kernel Cross Reference sys/geom/geom_disk.c

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