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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, kdev_t dev,
unsigned long first_sector, int first_part_minor)
{
int i;
struct buffer_head *bh;
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 */
#define SBLOCK ((unsigned long)((16384 - sizeof(struct ultrix_disklabel)) \
/get_ptable_blocksize(dev)))
bh = bread (dev, SBLOCK, get_ptable_blocksize(dev));
if (!bh) {
if (warn_no_part) printk (" unable to read block 0x%lx\n", SBLOCK);
return -1;
}
label = (struct ultrix_disklabel *)(bh->b_data
+ get_ptable_blocksize(dev)
- sizeof(struct ultrix_disklabel));
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);
brelse(bh);
printk ("\n");
return 1;
} else {
brelse(bh);
return 0;
}
}
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