LXR linux/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
  10/*
  11 *      Volume ID structure: on first 256-bytes sector of disk
  12 */
  13
  14struct 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
  23struct 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
  34struct dkblk0 {
  35        struct volumeid dk_vid;
  36        struct dkconfig dk_ios;
  37};
  38
  39/*
  40 *      Slice Table Structure
  41 */
  42
  43struct slice {
  44        __be32  nblocks;                /* slice size (in blocks) */
  45        __be32  blkoff;                 /* block offset of slice */
  46};
  47
  48
  49int sysv68_partition(struct parsed_partitions *state)
  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        char tmp[64];
  58
  59        data = read_part_sector(state, 0, &sect);
  60        if (!data)
  61                return -1;
  62
  63        b = (struct dkblk0 *)data;
  64        if (memcmp(b->dk_vid.vid_mac, "MOTOROLA", sizeof(b->dk_vid.vid_mac))) {
  65                put_dev_sector(sect);
  66                return 0;
  67        }
  68        slices = be16_to_cpu(b->dk_ios.ios_slccnt);
  69        i = be32_to_cpu(b->dk_ios.ios_slcblk);
  70        put_dev_sector(sect);
  71
  72        data = read_part_sector(state, i, &sect);
  73        if (!data)
  74                return -1;
  75
  76        slices -= 1; /* last slice is the whole disk */
  77        snprintf(tmp, sizeof(tmp), "sysV68: %s(s%u)", state->name, slices);
  78        strlcat(state->pp_buf, tmp, PAGE_SIZE);
  79        slice = (struct slice *)data;
  80        for (i = 0; i < slices; i++, slice++) {
  81                if (slot == state->limit)
  82                        break;
  83                if (be32_to_cpu(slice->nblocks)) {
  84                        put_partition(state, slot,
  85                                be32_to_cpu(slice->blkoff),
  86                                be32_to_cpu(slice->nblocks));
  87                        snprintf(tmp, sizeof(tmp), "(s%u)", i);
  88                        strlcat(state->pp_buf, tmp, PAGE_SIZE);
  89                }
  90                slot++;
  91        }
  92        strlcat(state->pp_buf, "\n", PAGE_SIZE);
  93        put_dev_sector(sect);
  94        return 1;
  95}
  96