root/fs/partitions/sysv68.c

DEFINITIONS

1. sysv68_partition

/*
 *  fs/partitions/sysv68.c
 *
 *  Copyright (C) 2007 Philippe De Muyter <phdm@macqel.be>
 */

#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, struct block_device *bdev)
{
        int i, slices;
        int slot = 1;
        Sector sect;
        unsigned char *data;
        struct dkblk0 *b;
        struct slice *slice;

        data = read_dev_sector(bdev, 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_dev_sector(bdev, i, &sect);
        if (!data)
                return -1;

        slices -= 1; /* last slice is the whole disk */
        printk("sysV68: %s(s%u)", state->name, slices);
        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));
                        printk("(s%u)", i);
                }
                slot++;
        }
        printk("\n");
        put_dev_sector(sect);
        return 1;
}