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/*

 *  fs/partitions/ultrix.c

 *

 *  Code extracted from drivers/block/genhd.c

 *

 *  Re-organised Jul 1999 Russell King

 */

#include <linux/fs.h>

#include <linux/genhd.h>

#include <linux/kernel.h>

#include <linux/major.h>

#include <linux/blk.h>

#include "check.h"

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

                            unsigned long first_sector, int first_part_minor)

{

        int i;

        Sector sect;

        unsigned char *data;

        struct ultrix_disklabel {

                s32     pt_magic;       /* magic no. indicating part. info exits */

                s32     pt_valid;       /* set by driver if pt is current */

                struct  pt_info {

                        s32             pi_nblocks; /* no. of sectors */

                        u32             pi_blkoff;  /* block offset for start */

                } pt_part[8];

        } *label;

#define PT_MAGIC        0x032957        /* Partition magic number */

#define PT_VALID        1               /* Indicates if struct is valid */

        data = read_dev_sector(bdev, (16384 - sizeof(*label))/512, &sect);

        if (!data)

                return -1;

        label = (struct ultrix_disklabel *)(data + 512 - sizeof(*label));

        if (label->pt_magic == PT_MAGIC && label->pt_valid == PT_VALID) {

                for (i=0; i<8; i++, first_part_minor++)

                        if (label->pt_part[i].pi_nblocks)

                                add_gd_partition(hd, first_part_minor,

                                              label->pt_part[i].pi_blkoff,

                                              label->pt_part[i].pi_nblocks);

                put_dev_sector(sect);

                printk ("\n");

                return 1;

        } else {

                put_dev_sector(sect);

                return 0;

        }

}