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/5.2/sys/geom/geom_apple.c 116196 2003-06-11 06:49:16Z obrien $");
   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, " n %s ty %s",
  121                             mp->apmpart[pp->index].am_name,
  122                             mp->apmpart[pp->index].am_type);
  123                 else {
  124                         sbuf_printf(sb, "%s<name>%s</name>\n", indent,
  125                             mp->apmpart[pp->index].am_name);
  126                         sbuf_printf(sb, "%s<type>%s</type>\n", indent,
  127                             mp->apmpart[pp->index].am_type);
  128                 }
  129         }
  130 }
  131 
  132 #if 0
  133 static void
  134 g_apple_print()
  135 {
  136 
  137         /* XXX */
  138 }
  139 #endif
  140 
  141 static struct g_geom *
  142 g_apple_taste(struct g_class *mp, struct g_provider *pp, int insist)
  143 {
  144         struct g_geom *gp;
  145         struct g_consumer *cp;
  146         int error, i;
  147         struct g_apple_softc *ms;
  148         struct apm_partition *apm;
  149         u_int sectorsize;
  150         u_char *buf;
  151 
  152         g_trace(G_T_TOPOLOGY, "apple_taste(%s,%s)", mp->name, pp->name);
  153         g_topology_assert();
  154         gp = g_slice_new(mp, NAPMPART, pp, &cp, &ms, sizeof *ms, g_apple_start);
  155         if (gp == NULL)
  156                 return (NULL);
  157         g_topology_unlock();
  158         gp->dumpconf = g_apple_dumpconf;
  159         do {
  160                 if (gp->rank != 2 && insist == 0)
  161                         break;
  162 
  163                 sectorsize = cp->provider->sectorsize;
  164                 if (sectorsize != 512)
  165                         break;
  166 
  167                 buf = g_read_data(cp, 0, sectorsize, &error);
  168                 if (buf == NULL || error != 0)
  169                         break;
  170 
  171                 /*
  172                  * Test for the sector 0 driver record signature, and 
  173                  * validate sector and disk size
  174                  */
  175                 if (buf[0] != 'E' && buf[1] != 'R') {
  176                         g_free(buf);
  177                         break;
  178                 }
  179                 g_dec_drvrdesc(buf, ms);
  180                 g_free(buf);
  181 
  182                 if (ms->dd_bsiz != 512) {
  183                         break;
  184                 }
  185 
  186                 /*
  187                  * Read in the first partition map
  188                  */
  189                 buf = g_read_data(cp, sectorsize, sectorsize,  &error);
  190                 if (buf == NULL || error != 0)
  191                         break;
  192 
  193                 /*
  194                  * Decode the first partition: it's another indication of
  195                  * validity, as well as giving the size of the partition
  196                  * map
  197                  */
  198                 apm = &ms->apmpart[0];
  199                 g_dec_apple_partition(buf, apm);
  200                 g_free(buf);
  201                 
  202                 if (apm->am_sig[0] != 'P' || apm->am_sig[1] != 'M')
  203                         break;
  204                 ms->am_mapcnt0 = apm->am_mapcnt;
  205                
  206                 buf = g_read_data(cp, 2 * sectorsize, 
  207                     (NAPMPART - 1) * sectorsize,  &error);
  208                 if (buf == NULL || error != 0)
  209                         break;
  210 
  211                 for (i = 1; i < NAPMPART; i++) {
  212                         g_dec_apple_partition(buf + ((i - 1) * sectorsize),
  213                             &ms->apmpart[i]);
  214                 }
  215 
  216                 for (i = 0; i < NAPMPART; i++) {
  217                         apm = &ms->apmpart[i];
  218 
  219                         /*
  220                          * Validate partition sig and global mapcount
  221                          */
  222                         if (apm->am_sig[0] != 'P' ||
  223                             apm->am_sig[1] != 'M')
  224                                 continue;
  225                         if (apm->am_mapcnt != ms->am_mapcnt0)
  226                                 continue;
  227 
  228                         if (bootverbose) {
  229                                 printf("APM Slice %d (%s/%s) on %s:\n", 
  230                                     i + 1, apm->am_name, apm->am_type, 
  231                                     gp->name);
  232                                 /* g_apple_print(i, dp + i); */
  233                         }
  234                         g_topology_lock();
  235                         g_slice_config(gp, i, G_SLICE_CONFIG_SET,
  236                             (off_t)apm->am_start << 9ULL,
  237                             (off_t)apm->am_partcnt << 9ULL,
  238                             sectorsize,
  239                             "%ss%d", gp->name, i + 1);
  240                         g_topology_unlock();
  241                 }
  242                 g_free(buf);
  243                 break;
  244         } while(0);
  245         g_topology_lock();
  246         g_access_rel(cp, -1, 0, 0);
  247         if (LIST_EMPTY(&gp->provider)) {
  248                 g_slice_spoiled(cp);
  249                 return (NULL);
  250         }
  251         return (gp);
  252 }
  253 
  254 
  255 static struct g_class g_apple_class     = {
  256         .name = APPLE_CLASS_NAME,
  257         .taste = g_apple_taste,
  258 };
  259 
  260 DECLARE_GEOM_CLASS(g_apple_class, g_apple);

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

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