linux - block/partitions/ultrix.c

48 lines · 1.2 KiB

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
12	int 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	seq_buf_puts(&state->pp_buf, "\n");
43	return 1;
44	} else {
45	put_dev_sector(sect);
46	return 0;
47	}
48	}