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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * fs/partitions/amiga.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 | ||
600ffc5e FF |
11 | #define pr_fmt(fmt) fmt |
12 | ||
1da177e4 LT |
13 | #include <linux/types.h> |
14 | #include <linux/affs_hardblocks.h> | |
15 | ||
16 | #include "check.h" | |
1da177e4 LT |
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 | 43 | if (!data) { |
ffa9ed64 CH |
44 | pr_err("Dev %s: unable to read RDB block %d\n", |
45 | bdevname(state->bdev, b), blk); | |
57881dd9 | 46 | res = -1; |
1da177e4 LT |
47 | goto rdb_done; |
48 | } | |
49 | if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK)) | |
50 | continue; | |
51 | ||
52 | rdb = (struct RigidDiskBlock *)data; | |
53 | if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0) | |
54 | break; | |
55 | /* Try again with 0xdc..0xdf zeroed, Windows might have | |
56 | * trashed it. | |
57 | */ | |
58 | *(__be32 *)(data+0xdc) = 0; | |
59 | if (checksum_block((__be32 *)data, | |
60 | be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) { | |
600ffc5e FF |
61 | pr_err("Trashed word at 0xd0 in block %d ignored in checksum calculation\n", |
62 | blk); | |
1da177e4 LT |
63 | break; |
64 | } | |
65 | ||
600ffc5e | 66 | pr_err("Dev %s: RDB in block %d has bad checksum\n", |
1493bf21 | 67 | bdevname(state->bdev, b), blk); |
1da177e4 LT |
68 | } |
69 | ||
70 | /* blksize is blocks per 512 byte standard block */ | |
71 | blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512; | |
72 | ||
9c867fbe AD |
73 | { |
74 | char tmp[7 + 10 + 1 + 1]; | |
75 | ||
76 | /* Be more informative */ | |
77 | snprintf(tmp, sizeof(tmp), " RDSK (%d)", blksize * 512); | |
78 | strlcat(state->pp_buf, tmp, PAGE_SIZE); | |
79 | } | |
1da177e4 LT |
80 | blk = be32_to_cpu(rdb->rdb_PartitionList); |
81 | put_dev_sector(sect); | |
82 | for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) { | |
83 | blk *= blksize; /* Read in terms partition table understands */ | |
1493bf21 | 84 | data = read_part_sector(state, blk, §); |
1da177e4 | 85 | if (!data) { |
ffa9ed64 CH |
86 | pr_err("Dev %s: unable to read partition block %d\n", |
87 | bdevname(state->bdev, b), blk); | |
57881dd9 | 88 | res = -1; |
1da177e4 LT |
89 | goto rdb_done; |
90 | } | |
91 | pb = (struct PartitionBlock *)data; | |
92 | blk = be32_to_cpu(pb->pb_Next); | |
93 | if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION)) | |
94 | continue; | |
95 | if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 ) | |
96 | continue; | |
97 | ||
98 | /* Tell Kernel about it */ | |
99 | ||
100 | nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 - | |
101 | be32_to_cpu(pb->pb_Environment[9])) * | |
102 | be32_to_cpu(pb->pb_Environment[3]) * | |
103 | be32_to_cpu(pb->pb_Environment[5]) * | |
104 | blksize; | |
105 | if (!nr_sects) | |
106 | continue; | |
107 | start_sect = be32_to_cpu(pb->pb_Environment[9]) * | |
108 | be32_to_cpu(pb->pb_Environment[3]) * | |
109 | be32_to_cpu(pb->pb_Environment[5]) * | |
110 | blksize; | |
111 | put_partition(state,slot++,start_sect,nr_sects); | |
112 | { | |
113 | /* Be even more informative to aid mounting */ | |
114 | char dostype[4]; | |
9c867fbe AD |
115 | char tmp[42]; |
116 | ||
1da177e4 LT |
117 | __be32 *dt = (__be32 *)dostype; |
118 | *dt = pb->pb_Environment[16]; | |
119 | if (dostype[3] < ' ') | |
9c867fbe | 120 | snprintf(tmp, sizeof(tmp), " (%c%c%c^%c)", |
1da177e4 LT |
121 | dostype[0], dostype[1], |
122 | dostype[2], dostype[3] + '@' ); | |
123 | else | |
9c867fbe | 124 | snprintf(tmp, sizeof(tmp), " (%c%c%c%c)", |
1da177e4 LT |
125 | dostype[0], dostype[1], |
126 | dostype[2], dostype[3]); | |
9c867fbe AD |
127 | strlcat(state->pp_buf, tmp, PAGE_SIZE); |
128 | snprintf(tmp, sizeof(tmp), "(res %d spb %d)", | |
1da177e4 LT |
129 | be32_to_cpu(pb->pb_Environment[6]), |
130 | be32_to_cpu(pb->pb_Environment[4])); | |
9c867fbe | 131 | strlcat(state->pp_buf, tmp, PAGE_SIZE); |
1da177e4 LT |
132 | } |
133 | res = 1; | |
134 | } | |
9c867fbe | 135 | strlcat(state->pp_buf, "\n", PAGE_SIZE); |
1da177e4 LT |
136 | |
137 | rdb_done: | |
138 | return res; | |
139 | } |