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
16 int 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, §);
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
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