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_apple.c

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    1 /*-
    2  * Copyright (c) 2002 Peter Grehan.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 /*
   28  * GEOM module for Apple Partition Maps
   29  *  As described in 'Inside Macintosh Vol 3: About the SCSI Manager -
   30  *    The Structure of Block Devices"
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/6.0/sys/geom/geom_apple.c 133318 2004-08-08 07:57:53Z phk $");
   35 
   36 #include <sys/param.h>
   37 #include <sys/endian.h>
   38 #include <sys/systm.h>
   39 #include <sys/kernel.h>
   40 #include <sys/malloc.h>
   41 #include <sys/bio.h>
   42 #include <sys/lock.h>
   43 #include <sys/mutex.h>
   44 
   45 #include <sys/sbuf.h>
   46 #include <geom/geom.h>
   47 #include <geom/geom_slice.h>
   48 
   49 #define APPLE_CLASS_NAME "APPLE"
   50 
   51 #define NAPMPART  16    /* Max partitions */
   52 
   53 struct apm_partition {
   54         char       am_sig[2];
   55         u_int32_t  am_mapcnt;
   56         u_int32_t  am_start;
   57         u_int32_t  am_partcnt;
   58         char       am_name[32];
   59         char       am_type[32]; 
   60 };
   61 
   62 struct g_apple_softc {
   63         u_int16_t dd_bsiz;
   64         u_int32_t dd_blkcnt;
   65         u_int16_t dd_drvrcnt;
   66         u_int32_t am_mapcnt0;
   67         struct apm_partition apmpart[NAPMPART];
   68 };
   69 
   70 static void
   71 g_dec_drvrdesc(u_char *ptr, struct g_apple_softc *sc)
   72 {
   73         sc->dd_bsiz = be16dec(ptr + 2);
   74         sc->dd_blkcnt = be32dec(ptr + 4);
   75         sc->dd_drvrcnt = be32dec(ptr + 16);
   76 }
   77 
   78 static void
   79 g_dec_apple_partition(u_char *ptr, struct apm_partition *d)
   80 {
   81         d->am_sig[0] = ptr[0];
   82         d->am_sig[1] = ptr[1];
   83         d->am_mapcnt = be32dec(ptr + 4);
   84         d->am_start = be32dec(ptr + 8);
   85         d->am_partcnt = be32dec(ptr + 12);
   86         memcpy(d->am_name, ptr + 16, 32);
   87         memcpy(d->am_type, ptr + 48, 32);
   88 }
   89 
   90 static int
   91 g_apple_start(struct bio *bp)
   92 {
   93         struct g_provider *pp;
   94         struct g_geom *gp;
   95         struct g_slicer *gsp;
   96 
   97         pp = bp->bio_to;
   98         gp = pp->geom;
   99         gsp = gp->softc;
  100         if (bp->bio_cmd == BIO_GETATTR) {
  101                 if (g_handleattr_off_t(bp, "APM::offset",
  102                     gsp->slices[pp->index].offset))
  103                         return (1);
  104         }
  105         return (0);
  106 }
  107 
  108 static void
  109 g_apple_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, 
  110     struct g_consumer *cp __unused, struct g_provider *pp)
  111 {
  112         struct g_apple_softc *mp;
  113         struct g_slicer *gsp;
  114 
  115         gsp = gp->softc;
  116         mp = gsp->softc;
  117         g_slice_dumpconf(sb, indent, gp, cp, pp);
  118         if (pp != NULL) {
  119                 if (indent == NULL) {
  120                         sbuf_printf(sb, " ty %s",
  121                             mp->apmpart[pp->index].am_type);
  122                         if (*mp->apmpart[pp->index].am_name)
  123                                 sbuf_printf(sb, " sn %s",
  124                                     mp->apmpart[pp->index].am_name);
  125                 } else {
  126                         sbuf_printf(sb, "%s<name>%s</name>\n", indent,
  127                             mp->apmpart[pp->index].am_name);
  128                         sbuf_printf(sb, "%s<type>%s</type>\n", indent,
  129                             mp->apmpart[pp->index].am_type);
  130                 }
  131         }
  132 }
  133 
  134 #if 0
  135 static void
  136 g_apple_print()
  137 {
  138 
  139         /* XXX */
  140 }
  141 #endif
  142 
  143 static struct g_geom *
  144 g_apple_taste(struct g_class *mp, struct g_provider *pp, int insist)
  145 {
  146         struct g_geom *gp;
  147         struct g_consumer *cp;
  148         int error, i;
  149         struct g_apple_softc *ms;
  150         struct apm_partition *apm;
  151         u_int sectorsize;
  152         u_char *buf;
  153 
  154         g_trace(G_T_TOPOLOGY, "apple_taste(%s,%s)", mp->name, pp->name);
  155         g_topology_assert();
  156         gp = g_slice_new(mp, NAPMPART, pp, &cp, &ms, sizeof *ms, g_apple_start);
  157         if (gp == NULL)
  158                 return (NULL);
  159         g_topology_unlock();
  160         do {
  161                 if (gp->rank != 2 && insist == 0)
  162                         break;
  163 
  164                 sectorsize = cp->provider->sectorsize;
  165                 if (sectorsize != 512)
  166                         break;
  167 
  168                 buf = g_read_data(cp, 0, sectorsize, &error);
  169                 if (buf == NULL || error != 0)
  170                         break;
  171 
  172                 /*
  173                  * Test for the sector 0 driver record signature, and 
  174                  * validate sector and disk size
  175                  */
  176                 if (buf[0] != 'E' && buf[1] != 'R') {
  177                         g_free(buf);
  178                         break;
  179                 }
  180                 g_dec_drvrdesc(buf, ms);
  181                 g_free(buf);
  182 
  183                 if (ms->dd_bsiz != 512) {
  184                         break;
  185                 }
  186 
  187                 /*
  188                  * Read in the first partition map
  189                  */
  190                 buf = g_read_data(cp, sectorsize, sectorsize,  &error);
  191                 if (buf == NULL || error != 0)
  192                         break;
  193 
  194                 /*
  195                  * Decode the first partition: it's another indication of
  196                  * validity, as well as giving the size of the partition
  197                  * map
  198                  */
  199                 apm = &ms->apmpart[0];
  200                 g_dec_apple_partition(buf, apm);
  201                 g_free(buf);
  202                 
  203                 if (apm->am_sig[0] != 'P' || apm->am_sig[1] != 'M')
  204                         break;
  205                 ms->am_mapcnt0 = apm->am_mapcnt;
  206                
  207                 buf = g_read_data(cp, 2 * sectorsize, 
  208                     (NAPMPART - 1) * sectorsize,  &error);
  209                 if (buf == NULL || error != 0)
  210                         break;
  211 
  212                 for (i = 1; i < NAPMPART; i++) {
  213                         g_dec_apple_partition(buf + ((i - 1) * sectorsize),
  214                             &ms->apmpart[i]);
  215                 }
  216 
  217                 for (i = 0; i < NAPMPART; i++) {
  218                         apm = &ms->apmpart[i];
  219 
  220                         /*
  221                          * Validate partition sig and global mapcount
  222                          */
  223                         if (apm->am_sig[0] != 'P' ||
  224                             apm->am_sig[1] != 'M')
  225                                 continue;
  226                         if (apm->am_mapcnt != ms->am_mapcnt0)
  227                                 continue;
  228 
  229                         if (bootverbose) {
  230                                 printf("APM Slice %d (%s/%s) on %s:\n", 
  231                                     i + 1, apm->am_name, apm->am_type, 
  232                                     gp->name);
  233                                 /* g_apple_print(i, dp + i); */
  234                         }
  235                         g_topology_lock();
  236                         g_slice_config(gp, i, G_SLICE_CONFIG_SET,
  237                             (off_t)apm->am_start << 9ULL,
  238                             (off_t)apm->am_partcnt << 9ULL,
  239                             sectorsize,
  240                             "%ss%d", gp->name, i + 1);
  241                         g_topology_unlock();
  242                 }
  243                 g_free(buf);
  244                 break;
  245         } while(0);
  246         g_topology_lock();
  247         g_access(cp, -1, 0, 0);
  248         if (LIST_EMPTY(&gp->provider)) {
  249                 g_slice_spoiled(cp);
  250                 return (NULL);
  251         }
  252         return (gp);
  253 }
  254 
  255 
  256 static struct g_class g_apple_class     = {
  257         .name = APPLE_CLASS_NAME,
  258         .version = G_VERSION,
  259         .taste = g_apple_taste,
  260         .dumpconf = g_apple_dumpconf,
  261 };
  262 
  263 DECLARE_GEOM_CLASS(g_apple_class, g_apple);

Cache object: 39c51a90ac5d209e49833893d8c63141


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