1/*
2 *  fs/partitions/osf.c
3 *
4 *  Code extracted from drivers/block/genhd.c
5 *
6 *  Copyright (C) 1991-1998  Linus Torvalds
7 *  Re-organised Feb 1998 Russell King
8 */
9
10#include "check.h"
11#include "osf.h"
12
13#define MAX_OSF_PARTITIONS 18
14
15int osf_partition(struct parsed_partitions *state)
16{
17	int i;
18	int slot = 1;
19	unsigned int npartitions;
20	Sector sect;
21	unsigned char *data;
22	struct disklabel {
23		__le32 d_magic;
24		__le16 d_type,d_subtype;
25		u8 d_typename[16];
26		u8 d_packname[16];
27		__le32 d_secsize;
28		__le32 d_nsectors;
29		__le32 d_ntracks;
30		__le32 d_ncylinders;
31		__le32 d_secpercyl;
32		__le32 d_secprtunit;
33		__le16 d_sparespertrack;
34		__le16 d_sparespercyl;
35		__le32 d_acylinders;
36		__le16 d_rpm, d_interleave, d_trackskew, d_cylskew;
37		__le32 d_headswitch, d_trkseek, d_flags;
38		__le32 d_drivedata[5];
39		__le32 d_spare[5];
40		__le32 d_magic2;
41		__le16 d_checksum;
42		__le16 d_npartitions;
43		__le32 d_bbsize, d_sbsize;
44		struct d_partition {
45			__le32 p_size;
46			__le32 p_offset;
47			__le32 p_fsize;
48			u8  p_fstype;
49			u8  p_frag;
50			__le16 p_cpg;
51		} d_partitions[MAX_OSF_PARTITIONS];
52	} * label;
53	struct d_partition * partition;
54
55	data = read_part_sector(state, 0, &sect);
56	if (!data)
57		return -1;
58
59	label = (struct disklabel *) (data+64);
60	partition = label->d_partitions;
61	if (le32_to_cpu(label->d_magic) != DISKLABELMAGIC) {
62		put_dev_sector(sect);
63		return 0;
64	}
65	if (le32_to_cpu(label->d_magic2) != DISKLABELMAGIC) {
66		put_dev_sector(sect);
67		return 0;
68	}
69	npartitions = le16_to_cpu(label->d_npartitions);
70	if (npartitions > MAX_OSF_PARTITIONS) {
71		put_dev_sector(sect);
72		return 0;
73	}
74	for (i = 0 ; i < npartitions; i++, partition++) {
75		if (slot == state->limit)
76		        break;
77		if (le32_to_cpu(partition->p_size))
78			put_partition(state, slot,
79				le32_to_cpu(partition->p_offset),
80				le32_to_cpu(partition->p_size));
81		slot++;
82	}
83	strlcat(state->pp_buf, "\n", PAGE_SIZE);
84	put_dev_sector(sect);
85	return 1;
86}
87