make register_disk() static
[linux-2.6.git] / fs / partitions / amiga.c
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
26 int amiga_partition(struct parsed_partitions *state)
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;
40                 data = read_part_sector(state, blk, &sect);
41                 if (!data) {
42                         if (warn_no_part)
43                                 printk("Dev %s: unable to read RDB block %d\n",
44                                        bdevname(state->bdev, b), blk);
45                         res = -1;
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",
66                        bdevname(state->bdev, b), blk);
67         }
68
69         /* blksize is blocks per 512 byte standard block */
70         blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
71
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         }
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 */
83                 data = read_part_sector(state, blk, &sect);
84                 if (!data) {
85                         if (warn_no_part)
86                                 printk("Dev %s: unable to read partition block %d\n",
87                                        bdevname(state->bdev, b), blk);
88                         res = -1;
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];
115                         char tmp[42];
116
117                         __be32 *dt = (__be32 *)dostype;
118                         *dt = pb->pb_Environment[16];
119                         if (dostype[3] < ' ')
120                                 snprintf(tmp, sizeof(tmp), " (%c%c%c^%c)",
121                                         dostype[0], dostype[1],
122                                         dostype[2], dostype[3] + '@' );
123                         else
124                                 snprintf(tmp, sizeof(tmp), " (%c%c%c%c)",
125                                         dostype[0], dostype[1],
126                                         dostype[2], dostype[3]);
127                         strlcat(state->pp_buf, tmp, PAGE_SIZE);
128                         snprintf(tmp, sizeof(tmp), "(res %d spb %d)",
129                                 be32_to_cpu(pb->pb_Environment[6]),
130                                 be32_to_cpu(pb->pb_Environment[4]));
131                         strlcat(state->pp_buf, tmp, PAGE_SIZE);
132                 }
133                 res = 1;
134         }
135         strlcat(state->pp_buf, "\n", PAGE_SIZE);
136
137 rdb_done:
138         return res;
139 }