1// SPDX-License-Identifier: GPL-2.0
2/*
3 *  fs/partitions/ultrix.c
4 *
5 *  Code extracted from drivers/block/genhd.c
6 *
7 *  Re-organised Jul 1999 Russell King
8 */
9
10#include "check.h"
11
12int ultrix_partition(struct parsed_partitions *state)
13{
14	int i;
15	Sector sect;
16	unsigned char *data;
17	struct ultrix_disklabel {
18		s32	pt_magic;	/* magic no. indicating part. info exits */
19		s32	pt_valid;	/* set by driver if pt is current */
20		struct  pt_info {
21			s32		pi_nblocks; /* no. of sectors */
22			u32		pi_blkoff;  /* block offset for start */
23		} pt_part[8];
24	} *label;
25
26#define PT_MAGIC	0x032957	/* Partition magic number */
27#define PT_VALID	1		/* Indicates if struct is valid */
28
29	data = read_part_sector(state, (16384 - sizeof(*label))/512, &sect);
30	if (!data)
31		return -1;
32
33	label = (struct ultrix_disklabel *)(data + 512 - sizeof(*label));
34
35	if (label->pt_magic == PT_MAGIC && label->pt_valid == PT_VALID) {
36		for (i=0; i<8; i++)
37			if (label->pt_part[i].pi_nblocks)
38				put_partition(state, i+1,
39					      label->pt_part[i].pi_blkoff,
40					      label->pt_part[i].pi_nblocks);
41		put_dev_sector(sect);
42		strlcat(state->pp_buf, "\n", PAGE_SIZE);
43		return 1;
44	} else {
45		put_dev_sector(sect);
46		return 0;
47	}
48}
49