1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
|
/*
* fs/partitions/amiga.c
*
* Code extracted from drivers/block/genhd.c
*
* Copyright (C) 1991-1998 Linus Torvalds
* Re-organised Feb 1998 Russell King
*/
#include <linux/fs.h>
#include <linux/genhd.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/blk.h>
#include <asm/byteorder.h>
#include <linux/affs_hardblocks.h>
#include "check.h"
#include "amiga.h"
static __inline__ u32
checksum_block(u32 *m, int size)
{
u32 sum = 0;
while (size--)
sum += be32_to_cpu(*m++);
return sum;
}
int
amiga_partition(struct gendisk *hd, kdev_t dev, unsigned long first_sector, int first_part_minor)
{
struct buffer_head *bh;
struct RigidDiskBlock *rdb;
struct PartitionBlock *pb;
int start_sect;
int nr_sects;
int blk;
int part, res;
int old_blocksize;
int blocksize;
old_blocksize = get_ptable_blocksize(dev);
blocksize = get_hardsect_size(dev);
if (blocksize < 512)
blocksize = 512;
set_blocksize(dev,blocksize);
res = 0;
for (blk = 0; blk < RDB_ALLOCATION_LIMIT; blk++) {
if(!(bh = bread(dev,blk,blocksize))) {
if (warn_no_part) printk("Dev %s: unable to read RDB block %d\n",
kdevname(dev),blk);
goto rdb_done;
}
if (*(u32 *)bh->b_data == cpu_to_be32(IDNAME_RIGIDDISK)) {
rdb = (struct RigidDiskBlock *)bh->b_data;
if (checksum_block((u32 *)bh->b_data,be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)) {
/* Try again with 0xdc..0xdf zeroed, Windows might have
* trashed it.
*/
*(u32 *)(&bh->b_data[0xdc]) = 0;
if (checksum_block((u32 *)bh->b_data,
be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)) {
brelse(bh);
printk("Dev %s: RDB in block %d has bad checksum\n",
kdevname(dev),blk);
continue;
}
printk("Warning: Trashed word at 0xd0 in block %d "
"ignored in checksum calculation\n",blk);
}
printk(" RDSK");
blk = be32_to_cpu(rdb->rdb_PartitionList);
brelse(bh);
for (part = 1; blk > 0 && part <= 16; part++) {
if (!(bh = bread(dev,blk,blocksize))) {
if (warn_no_part) printk("Dev %s: unable to read partition block %d\n",
kdevname(dev),blk);
goto rdb_done;
}
pb = (struct PartitionBlock *)bh->b_data;
blk = be32_to_cpu(pb->pb_Next);
if (pb->pb_ID == cpu_to_be32(IDNAME_PARTITION) && checksum_block(
(u32 *)pb,be32_to_cpu(pb->pb_SummedLongs) & 0x7F) == 0 ) {
/* Tell Kernel about it */
if (!(nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 -
be32_to_cpu(pb->pb_Environment[9])) *
be32_to_cpu(pb->pb_Environment[3]) *
be32_to_cpu(pb->pb_Environment[5]))) {
brelse(bh);
continue;
}
start_sect = be32_to_cpu(pb->pb_Environment[9]) *
be32_to_cpu(pb->pb_Environment[3]) *
be32_to_cpu(pb->pb_Environment[5]);
add_gd_partition(hd,first_part_minor,start_sect,nr_sects);
first_part_minor++;
res = 1;
}
brelse(bh);
}
printk("\n");
break;
}
else
brelse(bh);
}
rdb_done:
set_blocksize(dev,old_blocksize);
return res;
}
|
