Commit | Line | Data |
---|---|---|
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 | ||
10 | #include <linux/types.h> | |
11 | #include <linux/affs_hardblocks.h> | |
12 | ||
13 | #include "check.h" | |
14 | #include "amiga.h" | |
15 | ||
16 | static __inline__ u32 | |
17 | checksum_block(__be32 *m, int size) | |
18 | { | |
19 | u32 sum = 0; | |
20 | ||
21 | while (size--) | |
22 | sum += be32_to_cpu(*m++); | |
23 | return sum; | |
24 | } | |
25 | ||
1493bf21 | 26 | int amiga_partition(struct parsed_partitions *state) |
1da177e4 LT |
27 | { |
28 | Sector sect; | |
29 | unsigned char *data; | |
30 | struct RigidDiskBlock *rdb; | |
31 | struct PartitionBlock *pb; | |
32 | int start_sect, nr_sects, blk, part, res = 0; | |
33 | int blksize = 1; /* Multiplier for disk block size */ | |
34 | int slot = 1; | |
35 | char b[BDEVNAME_SIZE]; | |
36 | ||
37 | for (blk = 0; ; blk++, put_dev_sector(sect)) { | |
38 | if (blk == RDB_ALLOCATION_LIMIT) | |
39 | goto rdb_done; | |
1493bf21 | 40 | data = read_part_sector(state, blk, §); |
1da177e4 LT |
41 | if (!data) { |
42 | if (warn_no_part) | |
43 | printk("Dev %s: unable to read RDB block %d\n", | |
1493bf21 | 44 | bdevname(state->bdev, b), blk); |
57881dd9 | 45 | res = -1; |
1da177e4 LT |
46 | goto rdb_done; |
47 | } | |
48 | if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK)) | |
49 | continue; | |
50 | ||
51 | rdb = (struct RigidDiskBlock *)data; | |
52 | if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0) | |
53 | break; | |
54 | /* Try again with 0xdc..0xdf zeroed, Windows might have | |
55 | * trashed it. | |
56 | */ | |
57 | *(__be32 *)(data+0xdc) = 0; | |
58 | if (checksum_block((__be32 *)data, | |
59 | be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) { | |
60 | printk("Warning: Trashed word at 0xd0 in block %d " | |
61 | "ignored in checksum calculation\n",blk); | |
62 | break; | |
63 | } | |
64 | ||
65 | printk("Dev %s: RDB in block %d has bad checksum\n", | |
1493bf21 | 66 | bdevname(state->bdev, b), blk); |
1da177e4 LT |
67 | } |
68 | ||
69 | /* blksize is blocks per 512 byte standard block */ | |
70 | blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512; | |
71 | ||
9c867fbe AD |
72 | { |
73 | char tmp[7 + 10 + 1 + 1]; | |
74 | ||
75 | /* Be more informative */ | |
76 | snprintf(tmp, sizeof(tmp), " RDSK (%d)", blksize * 512); | |
77 | strlcat(state->pp_buf, tmp, PAGE_SIZE); | |
78 | } | |
1da177e4 LT |
79 | blk = be32_to_cpu(rdb->rdb_PartitionList); |
80 | put_dev_sector(sect); | |
81 | for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) { | |
82 | blk *= blksize; /* Read in terms partition table understands */ | |
1493bf21 | 83 | data = read_part_sector(state, blk, §); |
1da177e4 LT |
84 | if (!data) { |
85 | if (warn_no_part) | |
86 | printk("Dev %s: unable to read partition block %d\n", | |
1493bf21 | 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 | } |