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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/partitions/amiga.c | |
3 | * | |
4 | * Code extracted from drivers/block/genhd.c | |
5 | * | |
6 | * Copyright (C) 1991-1998 Linus Torvalds | |
7 | * Re-organised Feb 1998 Russell King | |
8 | */ | |
9 | ||
600ffc5e FF |
10 | #define pr_fmt(fmt) fmt |
11 | ||
1da177e4 LT |
12 | #include <linux/types.h> |
13 | #include <linux/affs_hardblocks.h> | |
14 | ||
15 | #include "check.h" | |
16 | #include "amiga.h" | |
17 | ||
18 | static __inline__ u32 | |
19 | checksum_block(__be32 *m, int size) | |
20 | { | |
21 | u32 sum = 0; | |
22 | ||
23 | while (size--) | |
24 | sum += be32_to_cpu(*m++); | |
25 | return sum; | |
26 | } | |
27 | ||
1493bf21 | 28 | int amiga_partition(struct parsed_partitions *state) |
1da177e4 LT |
29 | { |
30 | Sector sect; | |
31 | unsigned char *data; | |
32 | struct RigidDiskBlock *rdb; | |
33 | struct PartitionBlock *pb; | |
34 | int start_sect, nr_sects, blk, part, res = 0; | |
35 | int blksize = 1; /* Multiplier for disk block size */ | |
36 | int slot = 1; | |
37 | char b[BDEVNAME_SIZE]; | |
38 | ||
39 | for (blk = 0; ; blk++, put_dev_sector(sect)) { | |
40 | if (blk == RDB_ALLOCATION_LIMIT) | |
41 | goto rdb_done; | |
1493bf21 | 42 | data = read_part_sector(state, blk, §); |
1da177e4 LT |
43 | if (!data) { |
44 | if (warn_no_part) | |
600ffc5e | 45 | pr_err("Dev %s: unable to read RDB block %d\n", |
1493bf21 | 46 | bdevname(state->bdev, b), blk); |
57881dd9 | 47 | res = -1; |
1da177e4 LT |
48 | goto rdb_done; |
49 | } | |
50 | if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK)) | |
51 | continue; | |
52 | ||
53 | rdb = (struct RigidDiskBlock *)data; | |
54 | if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0) | |
55 | break; | |
56 | /* Try again with 0xdc..0xdf zeroed, Windows might have | |
57 | * trashed it. | |
58 | */ | |
59 | *(__be32 *)(data+0xdc) = 0; | |
60 | if (checksum_block((__be32 *)data, | |
61 | be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) { | |
600ffc5e FF |
62 | pr_err("Trashed word at 0xd0 in block %d ignored in checksum calculation\n", |
63 | blk); | |
1da177e4 LT |
64 | break; |
65 | } | |
66 | ||
600ffc5e | 67 | pr_err("Dev %s: RDB in block %d has bad checksum\n", |
1493bf21 | 68 | bdevname(state->bdev, b), blk); |
1da177e4 LT |
69 | } |
70 | ||
71 | /* blksize is blocks per 512 byte standard block */ | |
72 | blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512; | |
73 | ||
9c867fbe AD |
74 | { |
75 | char tmp[7 + 10 + 1 + 1]; | |
76 | ||
77 | /* Be more informative */ | |
78 | snprintf(tmp, sizeof(tmp), " RDSK (%d)", blksize * 512); | |
79 | strlcat(state->pp_buf, tmp, PAGE_SIZE); | |
80 | } | |
1da177e4 LT |
81 | blk = be32_to_cpu(rdb->rdb_PartitionList); |
82 | put_dev_sector(sect); | |
83 | for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) { | |
84 | blk *= blksize; /* Read in terms partition table understands */ | |
1493bf21 | 85 | data = read_part_sector(state, blk, §); |
1da177e4 LT |
86 | if (!data) { |
87 | if (warn_no_part) | |
600ffc5e | 88 | pr_err("Dev %s: unable to read partition block %d\n", |
1493bf21 | 89 | bdevname(state->bdev, b), blk); |
57881dd9 | 90 | res = -1; |
1da177e4 LT |
91 | goto rdb_done; |
92 | } | |
93 | pb = (struct PartitionBlock *)data; | |
94 | blk = be32_to_cpu(pb->pb_Next); | |
95 | if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION)) | |
96 | continue; | |
97 | if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 ) | |
98 | continue; | |
99 | ||
100 | /* Tell Kernel about it */ | |
101 | ||
102 | nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 - | |
103 | be32_to_cpu(pb->pb_Environment[9])) * | |
104 | be32_to_cpu(pb->pb_Environment[3]) * | |
105 | be32_to_cpu(pb->pb_Environment[5]) * | |
106 | blksize; | |
107 | if (!nr_sects) | |
108 | continue; | |
109 | start_sect = be32_to_cpu(pb->pb_Environment[9]) * | |
110 | be32_to_cpu(pb->pb_Environment[3]) * | |
111 | be32_to_cpu(pb->pb_Environment[5]) * | |
112 | blksize; | |
113 | put_partition(state,slot++,start_sect,nr_sects); | |
114 | { | |
115 | /* Be even more informative to aid mounting */ | |
116 | char dostype[4]; | |
9c867fbe AD |
117 | char tmp[42]; |
118 | ||
1da177e4 LT |
119 | __be32 *dt = (__be32 *)dostype; |
120 | *dt = pb->pb_Environment[16]; | |
121 | if (dostype[3] < ' ') | |
9c867fbe | 122 | snprintf(tmp, sizeof(tmp), " (%c%c%c^%c)", |
1da177e4 LT |
123 | dostype[0], dostype[1], |
124 | dostype[2], dostype[3] + '@' ); | |
125 | else | |
9c867fbe | 126 | snprintf(tmp, sizeof(tmp), " (%c%c%c%c)", |
1da177e4 LT |
127 | dostype[0], dostype[1], |
128 | dostype[2], dostype[3]); | |
9c867fbe AD |
129 | strlcat(state->pp_buf, tmp, PAGE_SIZE); |
130 | snprintf(tmp, sizeof(tmp), "(res %d spb %d)", | |
1da177e4 LT |
131 | be32_to_cpu(pb->pb_Environment[6]), |
132 | be32_to_cpu(pb->pb_Environment[4])); | |
9c867fbe | 133 | strlcat(state->pp_buf, tmp, PAGE_SIZE); |
1da177e4 LT |
134 | } |
135 | res = 1; | |
136 | } | |
9c867fbe | 137 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
1da177e4 LT |
138 | |
139 | rdb_done: | |
140 | return res; | |
141 | } |