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/*

 *  fs/partitions/mac.c

 *

 *  Code extracted from drivers/block/genhd.c

 *  Copyright (C) 1991-1998  Linus Torvalds

 *  Re-organised Feb 1998 Russell King

 */

#include <linux/config.h>

#include <linux/fs.h>

#include <linux/genhd.h>

#include <linux/kernel.h>

#include <linux/major.h>

#include <linux/string.h>

#include <linux/blk.h>

#include <linux/ctype.h>

#include <asm/system.h>

#include "check.h"

#include "mac.h"

/*

 * Code to understand MacOS partition tables.

 */

int mac_partition(struct gendisk *hd, struct block_device *bdev,

                unsigned long fsec, int first_part_minor)

{

        Sector sect;

        unsigned char *data;

        int blk, blocks_in_map;

        unsigned secsize;

        struct mac_partition *part;

        struct mac_driver_desc *md;

        /* Get 0th block and look at the first partition map entry. */

        md = (struct mac_driver_desc *) read_dev_sector(bdev, 0, &sect);

        if (!md)

                return -1;

        if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) {

                put_dev_sector(sect);

                return 0;

        }

        secsize = be16_to_cpu(md->block_size);

        put_dev_sector(sect);

        data = read_dev_sector(bdev, secsize/512, &sect);

        if (!data)

                return -1;

        part = (struct mac_partition *) (data + secsize%512);

        if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) {

                put_dev_sector(sect);

                return 0;                /* not a MacOS disk */

        }

        printk(" [mac]");

        blocks_in_map = be32_to_cpu(part->map_count);

        for (blk = 1; blk <= blocks_in_map; ++blk) {

                int pos = blk * secsize;

                put_dev_sector(sect);

                data = read_dev_sector(bdev, pos/512, &sect);

                if (!data)

                        return -1;

                part = (struct mac_partition *) (data + pos%512);

                if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)

                        break;

                add_gd_partition(hd, first_part_minor,

                        fsec + be32_to_cpu(part->start_block) * (secsize/512),

                        be32_to_cpu(part->block_count) * (secsize/512));

                ++first_part_minor;

        }

        put_dev_sector(sect);

        printk("\n");

        return 1;

}