block/partitions/sysv68.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  fs/partitions/sysv68.c
   4  *
   5  *  Copyright (C) 2007 Philippe De Muyter <phdm@macqel.be>
   6  */
   7
   8 #include "check.h"
   9 #include "sysv68.h"
  10
  11 /*
  12  *      Volume ID structure: on first 256-bytes sector of disk
  13  */
  14
  15 struct volumeid {
  16         u8      vid_unused[248];
  17         u8      vid_mac[8];     /* ASCII string "MOTOROLA" */
  18 };
  19
  20 /*
  21  *      config block: second 256-bytes sector on disk
  22  */
  23
  24 struct dkconfig {
  25         u8      ios_unused0[128];
  26         __be32  ios_slcblk;     /* Slice table block number */
  27         __be16  ios_slccnt;     /* Number of entries in slice table */
  28         u8      ios_unused1[122];
  29 };
  30
  31 /*
  32  *      combined volumeid and dkconfig block
  33  */
  34
  35 struct dkblk0 {
  36         struct volumeid dk_vid;
  37         struct dkconfig dk_ios;
  38 };
  39
  40 /*
  41  *      Slice Table Structure
  42  */
  43
  44 struct slice {
  45         __be32  nblocks;                /* slice size (in blocks) */
  46         __be32  blkoff;                 /* block offset of slice */
  47 };
  48
  49
  50 int sysv68_partition(struct parsed_partitions *state)
  51 {
  52         int i, slices;
  53         int slot = 1;
  54         Sector sect;
  55         unsigned char *data;
  56         struct dkblk0 *b;
  57         struct slice *slice;
  58         char tmp[64];
  59
  60         data = read_part_sector(state, 0, &sect);
  61         if (!data)
  62                 return -1;
  63
  64         b = (struct dkblk0 *)data;
  65         if (memcmp(b->dk_vid.vid_mac, "MOTOROLA", sizeof(b->dk_vid.vid_mac))) {
  66                 put_dev_sector(sect);
  67                 return 0;
  68         }
  69         slices = be16_to_cpu(b->dk_ios.ios_slccnt);
  70         i = be32_to_cpu(b->dk_ios.ios_slcblk);
  71         put_dev_sector(sect);
  72
  73         data = read_part_sector(state, i, &sect);
  74         if (!data)
  75                 return -1;
  76
  77         slices -= 1; /* last slice is the whole disk */
  78         snprintf(tmp, sizeof(tmp), "sysV68: %s(s%u)", state->name, slices);
  79         strlcat(state->pp_buf, tmp, PAGE_SIZE);
  80         slice = (struct slice *)data;
  81         for (i = 0; i < slices; i++, slice++) {
  82                 if (slot == state->limit)
  83                         break;
  84                 if (be32_to_cpu(slice->nblocks)) {
  85                         put_partition(state, slot,
  86                                 be32_to_cpu(slice->blkoff),
  87                                 be32_to_cpu(slice->nblocks));
  88                         snprintf(tmp, sizeof(tmp), "(s%u)", i);
  89                         strlcat(state->pp_buf, tmp, PAGE_SIZE);
  90                 }
  91                 slot++;
  92         }
  93         strlcat(state->pp_buf, "\n", PAGE_SIZE);
  94         put_dev_sector(sect);
  95         return 1;
  96 }