blob: 2b13533d60a294e43f460fe1276256e34ef6b256 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Fabian Frederick600ffc52014-06-12 20:04:52 +020010#define pr_fmt(fmt) fmt
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/types.h>
13#include <linux/affs_hardblocks.h>
14
15#include "check.h"
16#include "amiga.h"
17
18static __inline__ u32
19checksum_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
Tejun Heo1493bf22010-05-15 20:09:30 +020028int amiga_partition(struct parsed_partitions *state)
Linus Torvalds1da177e2005-04-16 15:20:36 -070029{
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;
Tejun Heo1493bf22010-05-15 20:09:30 +020042 data = read_part_sector(state, blk, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 if (!data) {
44 if (warn_no_part)
Fabian Frederick600ffc52014-06-12 20:04:52 +020045 pr_err("Dev %s: unable to read RDB block %d\n",
Tejun Heo1493bf22010-05-15 20:09:30 +020046 bdevname(state->bdev, b), blk);
Suzuki K P57881dd2006-12-06 20:35:16 -080047 res = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 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) {
Fabian Frederick600ffc52014-06-12 20:04:52 +020062 pr_err("Trashed word at 0xd0 in block %d ignored in checksum calculation\n",
63 blk);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 break;
65 }
66
Fabian Frederick600ffc52014-06-12 20:04:52 +020067 pr_err("Dev %s: RDB in block %d has bad checksum\n",
Tejun Heo1493bf22010-05-15 20:09:30 +020068 bdevname(state->bdev, b), blk);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 }
70
71 /* blksize is blocks per 512 byte standard block */
72 blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
73
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -070074 {
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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 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 */
Tejun Heo1493bf22010-05-15 20:09:30 +020085 data = read_part_sector(state, blk, &sect);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 if (!data) {
87 if (warn_no_part)
Fabian Frederick600ffc52014-06-12 20:04:52 +020088 pr_err("Dev %s: unable to read partition block %d\n",
Tejun Heo1493bf22010-05-15 20:09:30 +020089 bdevname(state->bdev, b), blk);
Suzuki K P57881dd2006-12-06 20:35:16 -080090 res = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 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];
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700117 char tmp[42];
118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 __be32 *dt = (__be32 *)dostype;
120 *dt = pb->pb_Environment[16];
121 if (dostype[3] < ' ')
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700122 snprintf(tmp, sizeof(tmp), " (%c%c%c^%c)",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 dostype[0], dostype[1],
124 dostype[2], dostype[3] + '@' );
125 else
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700126 snprintf(tmp, sizeof(tmp), " (%c%c%c%c)",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 dostype[0], dostype[1],
128 dostype[2], dostype[3]);
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700129 strlcat(state->pp_buf, tmp, PAGE_SIZE);
130 snprintf(tmp, sizeof(tmp), "(res %d spb %d)",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 be32_to_cpu(pb->pb_Environment[6]),
132 be32_to_cpu(pb->pb_Environment[4]));
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700133 strlcat(state->pp_buf, tmp, PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 }
135 res = 1;
136 }
Alexey Dobriyan9c867fb2010-08-10 18:03:14 -0700137 strlcat(state->pp_buf, "\n", PAGE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139rdb_done:
140 return res;
141}