fs/partitions/sysv68.c

   1 /*
   2  *  fs/partitions/sysv68.c
   3  *
   4  *  Copyright (C) 2007 Philippe De Muyter <phdm@macqel.be>
   5  */
   6
   7 #include "check.h"
   8 #include "sysv68.h"
   9
  10 /*
  11  *      Volume ID structure: on first 256-bytes sector of disk
  12  */
  13
  14 struct volumeid {
  15         u8      vid_unused[248];
  16         u8      vid_mac[8];     /* ASCII string "MOTOROLA" */
  17 };
  18
  19 /*
  20  *      config block: second 256-bytes sector on disk
  21  */
  22
  23 struct dkconfig {
  24         u8      ios_unused0[128];
  25         __be32  ios_slcblk;     /* Slice table block number */
  26         __be16  ios_slccnt;     /* Number of entries in slice table */
  27         u8      ios_unused1[122];
  28 };
  29
  30 /*
  31  *      combined volumeid and dkconfig block
  32  */
  33
  34 struct dkblk0 {
  35         struct volumeid dk_vid;
  36         struct dkconfig dk_ios;
  37 };
  38
  39 /*
  40  *      Slice Table Structure
  41  */
  42
  43 struct slice {
  44         __be32  nblocks;                /* slice size (in blocks) */
  45         __be32  blkoff;                 /* block offset of slice */
  46 };
  47
  48
  49 int sysv68_partition(struct parsed_partitions *state, struct block_device *bdev)
  50 {
  51         int i, slices;
  52         int slot = 1;
  53         Sector sect;
  54         unsigned char *data;
  55         struct dkblk0 *b;
  56         struct slice *slice;
  57
  58         data = read_dev_sector(bdev, 0, &sect);
  59         if (!data)
  60                 return -1;
  61
  62         b = (struct dkblk0 *)data;
  63         if (memcmp(b->dk_vid.vid_mac, "MOTOROLA", sizeof(b->dk_vid.vid_mac))) {
  64                 put_dev_sector(sect);
  65                 return 0;
  66         }
  67         slices = be16_to_cpu(b->dk_ios.ios_slccnt);
  68         i = be32_to_cpu(b->dk_ios.ios_slcblk);
  69         put_dev_sector(sect);
  70
  71         data = read_dev_sector(bdev, i, &sect);
  72         if (!data)
  73                 return -1;
  74
  75         slices -= 1; /* last slice is the whole disk */
  76         printk("sysV68: %s(s%u)", state->name, slices);
  77         slice = (struct slice *)data;
  78         for (i = 0; i < slices; i++, slice++) {
  79                 if (slot == state->limit)
  80                         break;
  81                 if (be32_to_cpu(slice->nblocks)) {
  82                         put_partition(state, slot,
  83                                 be32_to_cpu(slice->blkoff),
  84                                 be32_to_cpu(slice->nblocks));
  85                         printk("(s%u)", i);
  86                 }
  87                 slot++;
  88         }
  89         printk("\n");
  90         put_dev_sector(sect);
  91         return 1;
  92 }