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