sysv68.c

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/*
 *  fs/partitions/sysv68.c
 *
 *  Copyright (C) 2007 Philippe De Muyter <[email protected]>
 */

#include "check.h"
#include "sysv68.h"

/*
 *  Volume ID structure: on first 256-bytes sector of disk
 */

struct volumeid {
    u8  vid_unused[248];
    u8  vid_mac[8]; /* ASCII string "MOTOROLA" */
};

/*
 *  config block: second 256-bytes sector on disk
 */

struct dkconfig {
    u8  ios_unused0[128];
    __be32  ios_slcblk; /* Slice table block number */
    __be16  ios_slccnt; /* Number of entries in slice table */
    u8  ios_unused1[122];
};

/*
 *  combined volumeid and dkconfig block
 */

struct dkblk0 {
    struct volumeid dk_vid;
    struct dkconfig dk_ios;
};

/*
 *  Slice Table Structure
 */

struct slice {
    __be32  nblocks;        /* slice size (in blocks) */
    __be32  blkoff;         /* block offset of slice */
};


int sysv68_partition(struct parsed_partitions *state)
{
    int i, slices;
    int slot = 1;
    Sector sect;
    unsigned char *data;
    struct dkblk0 *b;
    struct slice *slice;
    char tmp[64];

    data = read_part_sector(state, 0, &sect);
    if (!data)
        return -1;

    b = (struct dkblk0 *)data;
    if (memcmp(b->dk_vid.vid_mac, "MOTOROLA", sizeof(b->dk_vid.vid_mac))) {
        put_dev_sector(sect);
        return 0;
    }
    slices = be16_to_cpu(b->dk_ios.ios_slccnt);
    i = be32_to_cpu(b->dk_ios.ios_slcblk);
    put_dev_sector(sect);

    data = read_part_sector(state, i, &sect);
    if (!data)
        return -1;

    slices -= 1; /* last slice is the whole disk */
    snprintf(tmp, sizeof(tmp), "sysV68: %s(s%u)", state->name, slices);
    strlcat(state->pp_buf, tmp, PAGE_SIZE);
    slice = (struct slice *)data;
    for (i = 0; i < slices; i++, slice++) {
        if (slot == state->limit)
            break;
        if (be32_to_cpu(slice->nblocks)) {
            put_partition(state, slot,
                be32_to_cpu(slice->blkoff),
                be32_to_cpu(slice->nblocks));
            snprintf(tmp, sizeof(tmp), "(s%u)", i);
            strlcat(state->pp_buf, tmp, PAGE_SIZE);
        }
        slot++;
    }
    strlcat(state->pp_buf, "\n", PAGE_SIZE);
    put_dev_sector(sect);
    return 1;
}