Commit | Line | Data |
---|---|---|
19d0e8ce PDM |
1 | /* |
2 | * fs/partitions/sysv68.c | |
3 | * | |
4 | * Copyright (C) 2007 Philippe De Muyter <phdm@macqel.be> | |
5 | */ | |
6 | ||
7 | #include "check.h" | |
8 | #include "sysv68.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, struct block_device *bdev) | |
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 | ||
58 | data = read_dev_sector(bdev, 0, §); | |
59 | if (!data) | |
60 | return -1; | |
61 | ||
62 | b = (struct dkblk0 *)data; | |
63 | if (memcmp(b->dk_vid.vid_mac, "MOTOROLA", sizeof(b->dk_vid.vid_mac))) { | |
64 | put_dev_sector(sect); | |
65 | return 0; | |
66 | } | |
67 | slices = be16_to_cpu(b->dk_ios.ios_slccnt); | |
68 | i = be32_to_cpu(b->dk_ios.ios_slcblk); | |
69 | put_dev_sector(sect); | |
70 | ||
71 | data = read_dev_sector(bdev, i, §); | |
72 | if (!data) | |
73 | return -1; | |
74 | ||
75 | slices -= 1; /* last slice is the whole disk */ | |
76 | printk("sysV68: %s(s%u)", state->name, slices); | |
77 | slice = (struct slice *)data; | |
78 | for (i = 0; i < slices; i++, slice++) { | |
79 | if (slot == state->limit) | |
80 | break; | |
81 | if (be32_to_cpu(slice->nblocks)) { | |
82 | put_partition(state, slot, | |
83 | be32_to_cpu(slice->blkoff), | |
84 | be32_to_cpu(slice->nblocks)); | |
85 | printk("(s%u)", i); | |
86 | } | |
87 | slot++; | |
88 | } | |
89 | printk("\n"); | |
90 | put_dev_sector(sect); | |
91 | return 1; | |
92 | } |