1// SPDX-License-Identifier: GPL-2.0
2/*
3 *  fs/partitions/osf.c
4 *
5 *  Code extracted from drivers/block/genhd.c
6 *
7 *  Copyright (C) 1991-1998  Linus Torvalds
8 *  Re-organised Feb 1998 Russell King
9 */
10
11#include "check.h"
12
13#define MAX_OSF_PARTITIONS 18
14#define DISKLABELMAGIC (0x82564557UL)
15
16int osf_partition(struct parsed_partitions *state)
17{
18	int i;
19	int slot = 1;
20	unsigned int npartitions;
21	Sector sect;
22	unsigned char *data;
23	struct disklabel {
24		__le32 d_magic;
25		__le16 d_type,d_subtype;
26		u8 d_typename[16];
27		u8 d_packname[16];
28		__le32 d_secsize;
29		__le32 d_nsectors;
30		__le32 d_ntracks;
31		__le32 d_ncylinders;
32		__le32 d_secpercyl;
33		__le32 d_secprtunit;
34		__le16 d_sparespertrack;
35		__le16 d_sparespercyl;
36		__le32 d_acylinders;
37		__le16 d_rpm, d_interleave, d_trackskew, d_cylskew;
38		__le32 d_headswitch, d_trkseek, d_flags;
39		__le32 d_drivedata[5];
40		__le32 d_spare[5];
41		__le32 d_magic2;
42		__le16 d_checksum;
43		__le16 d_npartitions;
44		__le32 d_bbsize, d_sbsize;
45		struct d_partition {
46			__le32 p_size;
47			__le32 p_offset;
48			__le32 p_fsize;
49			u8  p_fstype;
50			u8  p_frag;
51			__le16 p_cpg;
52		} d_partitions[MAX_OSF_PARTITIONS];
53	} * label;
54	struct d_partition * partition;
55
56	data = read_part_sector(state, 0, &sect);
57	if (!data)
58		return -1;
59
60	label = (struct disklabel *) (data+64);
61	partition = label->d_partitions;
62	if (le32_to_cpu(label->d_magic) != DISKLABELMAGIC) {
63		put_dev_sector(sect);
64		return 0;
65	}
66	if (le32_to_cpu(label->d_magic2) != DISKLABELMAGIC) {
67		put_dev_sector(sect);
68		return 0;
69	}
70	npartitions = le16_to_cpu(label->d_npartitions);
71	if (npartitions > MAX_OSF_PARTITIONS) {
72		put_dev_sector(sect);
73		return 0;
74	}
75	for (i = 0 ; i < npartitions; i++, partition++) {
76		if (slot == state->limit)
77		        break;
78		if (le32_to_cpu(partition->p_size))
79			put_partition(state, slot,
80				le32_to_cpu(partition->p_offset),
81				le32_to_cpu(partition->p_size));
82		slot++;
83	}
84	strlcat(state->pp_buf, "\n", PAGE_SIZE);
85	put_dev_sector(sect);
86	return 1;
87}
88