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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
19d0e8ce PDM |
2 | /* |
3 | * fs/partitions/sysv68.c | |
4 | * | |
5 | * Copyright (C) 2007 Philippe De Muyter <phdm@macqel.be> | |
6 | */ | |
7 | ||
8 | #include "check.h" | |
9 | #include "sysv68.h" | |
10 | ||
11 | /* | |
12 | * Volume ID structure: on first 256-bytes sector of disk | |
13 | */ | |
14 | ||
15 | struct volumeid { | |
16 | u8 vid_unused[248]; | |
17 | u8 vid_mac[8]; /* ASCII string "MOTOROLA" */ | |
18 | }; | |
19 | ||
20 | /* | |
21 | * config block: second 256-bytes sector on disk | |
22 | */ | |
23 | ||
24 | struct dkconfig { | |
25 | u8 ios_unused0[128]; | |
26 | __be32 ios_slcblk; /* Slice table block number */ | |
27 | __be16 ios_slccnt; /* Number of entries in slice table */ | |
28 | u8 ios_unused1[122]; | |
29 | }; | |
30 | ||
31 | /* | |
32 | * combined volumeid and dkconfig block | |
33 | */ | |
34 | ||
35 | struct dkblk0 { | |
36 | struct volumeid dk_vid; | |
37 | struct dkconfig dk_ios; | |
38 | }; | |
39 | ||
40 | /* | |
41 | * Slice Table Structure | |
42 | */ | |
43 | ||
44 | struct slice { | |
45 | __be32 nblocks; /* slice size (in blocks) */ | |
46 | __be32 blkoff; /* block offset of slice */ | |
47 | }; | |
48 | ||
49 | ||
1493bf21 | 50 | int sysv68_partition(struct parsed_partitions *state) |
19d0e8ce PDM |
51 | { |
52 | int i, slices; | |
53 | int slot = 1; | |
54 | Sector sect; | |
55 | unsigned char *data; | |
56 | struct dkblk0 *b; | |
57 | struct slice *slice; | |
9c867fbe | 58 | char tmp[64]; |
19d0e8ce | 59 | |
1493bf21 | 60 | data = read_part_sector(state, 0, §); |
19d0e8ce PDM |
61 | if (!data) |
62 | return -1; | |
63 | ||
64 | b = (struct dkblk0 *)data; | |
65 | if (memcmp(b->dk_vid.vid_mac, "MOTOROLA", sizeof(b->dk_vid.vid_mac))) { | |
66 | put_dev_sector(sect); | |
67 | return 0; | |
68 | } | |
69 | slices = be16_to_cpu(b->dk_ios.ios_slccnt); | |
70 | i = be32_to_cpu(b->dk_ios.ios_slcblk); | |
71 | put_dev_sector(sect); | |
72 | ||
1493bf21 | 73 | data = read_part_sector(state, i, §); |
19d0e8ce PDM |
74 | if (!data) |
75 | return -1; | |
76 | ||
77 | slices -= 1; /* last slice is the whole disk */ | |
9c867fbe AD |
78 | snprintf(tmp, sizeof(tmp), "sysV68: %s(s%u)", state->name, slices); |
79 | strlcat(state->pp_buf, tmp, PAGE_SIZE); | |
19d0e8ce PDM |
80 | slice = (struct slice *)data; |
81 | for (i = 0; i < slices; i++, slice++) { | |
82 | if (slot == state->limit) | |
83 | break; | |
84 | if (be32_to_cpu(slice->nblocks)) { | |
85 | put_partition(state, slot, | |
86 | be32_to_cpu(slice->blkoff), | |
87 | be32_to_cpu(slice->nblocks)); | |
9c867fbe AD |
88 | snprintf(tmp, sizeof(tmp), "(s%u)", i); |
89 | strlcat(state->pp_buf, tmp, PAGE_SIZE); | |
19d0e8ce PDM |
90 | } |
91 | slot++; | |
92 | } | |
9c867fbe | 93 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
19d0e8ce PDM |
94 | put_dev_sector(sect); |
95 | return 1; | |
96 | } |