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
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
/*
* fs/partitions/atari.c
*
* Code extracted from drivers/block/genhd.c
*
* Copyright (C) 1991-1998 Linus Torvalds
* Re-organised Feb 1998 Russell King
*/
#include <linux/ctype.h>
#include "check.h"
#include "atari.h"
/* ++guenther: this should be settable by the user ("make config")?.
*/
#define ICD_PARTS
/* check if a partition entry looks valid -- Atari format is assumed if at
least one of the primary entries is ok this way */
#define VALID_PARTITION(pi,hdsiz) \
(((pi)->flg & 1) && \
isalnum((pi)->id[0]) && isalnum((pi)->id[1]) && isalnum((pi)->id[2]) && \
be32_to_cpu((pi)->st) <= (hdsiz) && \
be32_to_cpu((pi)->st) + be32_to_cpu((pi)->siz) <= (hdsiz))
static inline int OK_id(char *s)
{
return memcmp (s, "GEM", 3) == 0 || memcmp (s, "BGM", 3) == 0 ||
memcmp (s, "LNX", 3) == 0 || memcmp (s, "SWP", 3) == 0 ||
memcmp (s, "RAW", 3) == 0 ;
}
int atari_partition(struct parsed_partitions *state)
{
Sector sect;
struct rootsector *rs;
struct partition_info *pi;
u32 extensect;
u32 hd_size;
int slot;
#ifdef ICD_PARTS
int part_fmt = 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */
#endif
/*
* ATARI partition scheme supports 512 lba only. If this is not
* the case, bail early to avoid miscalculating hd_size.
*/
if (bdev_logical_block_size(state->bdev) != 512)
return 0;
rs = read_part_sector(state, 0, §);
if (!rs)
return -1;
/* Verify this is an Atari rootsector: */
hd_size = state->bdev->bd_inode->i_size >> 9;
if (!VALID_PARTITION(&rs->part[0], hd_size) &&
!VALID_PARTITION(&rs->part[1], hd_size) &&
!VALID_PARTITION(&rs->part[2], hd_size) &&
!VALID_PARTITION(&rs->part[3], hd_size)) {
/*
* if there's no valid primary partition, assume that no Atari
* format partition table (there's no reliable magic or the like
* :-()
*/
put_dev_sector(sect);
return 0;
}
pi = &rs->part[0];
strlcat(state->pp_buf, " AHDI", PAGE_SIZE);
for (slot = 1; pi < &rs->part[4] && slot < state->limit; slot++, pi++) {
struct rootsector *xrs;
Sector sect2;
ulong partsect;
if ( !(pi->flg & 1) )
continue;
/* active partition */
if (memcmp (pi->id, "XGM", 3) != 0) {
/* we don't care about other id's */
put_partition (state, slot, be32_to_cpu(pi->st),
be32_to_cpu(pi->siz));
continue;
}
/* extension partition */
#ifdef ICD_PARTS
part_fmt = 1;
#endif
strlcat(state->pp_buf, " XGM<", PAGE_SIZE);
partsect = extensect = be32_to_cpu(pi->st);
while (1) {
xrs = read_part_sector(state, partsect, §2);
if (!xrs) {
printk (" block %ld read failed\n", partsect);
put_dev_sector(sect);
return -1;
}
/* ++roman: sanity check: bit 0 of flg field must be set */
if (!(xrs->part[0].flg & 1)) {
printk( "\nFirst sub-partition in extended partition is not valid!\n" );
put_dev_sector(sect2);
break;
}
put_partition(state, slot,
partsect + be32_to_cpu(xrs->part[0].st),
be32_to_cpu(xrs->part[0].siz));
if (!(xrs->part[1].flg & 1)) {
/* end of linked partition list */
put_dev_sector(sect2);
break;
}
if (memcmp( xrs->part[1].id, "XGM", 3 ) != 0) {
printk("\nID of extended partition is not XGM!\n");
put_dev_sector(sect2);
break;
}
partsect = be32_to_cpu(xrs->part[1].st) + extensect;
put_dev_sector(sect2);
if (++slot == state->limit) {
printk( "\nMaximum number of partitions reached!\n" );
break;
}
}
strlcat(state->pp_buf, " >", PAGE_SIZE);
}
#ifdef ICD_PARTS
if ( part_fmt!=1 ) { /* no extended partitions -> test ICD-format */
pi = &rs->icdpart[0];
/* sanity check: no ICD format if first partition invalid */
if (OK_id(pi->id)) {
strlcat(state->pp_buf, " ICD<", PAGE_SIZE);
for (; pi < &rs->icdpart[8] && slot < state->limit; slot++, pi++) {
/* accept only GEM,BGM,RAW,LNX,SWP partitions */
if (!((pi->flg & 1) && OK_id(pi->id)))
continue;
part_fmt = 2;
put_partition (state, slot,
be32_to_cpu(pi->st),
be32_to_cpu(pi->siz));
}
strlcat(state->pp_buf, " >", PAGE_SIZE);
}
}
#endif
put_dev_sector(sect);
strlcat(state->pp_buf, "\n", PAGE_SIZE);
return 1;
}
|
