2 * fs/partitions/atari.c
4 * Code extracted from drivers/block/genhd.c
6 * Copyright (C) 1991-1998 Linus Torvalds
7 * Re-organised Feb 1998 Russell King
10 #include <linux/ctype.h>
14 /* ++guenther: this should be settable by the user ("make config")?.
18 /* check if a partition entry looks valid -- Atari format is assumed if at
19 least one of the primary entries is ok this way */
20 #define VALID_PARTITION(pi,hdsiz) \
22 isalnum((pi)->id[0]) && isalnum((pi)->id[1]) && isalnum((pi)->id[2]) && \
23 be32_to_cpu((pi)->st) <= (hdsiz) && \
24 be32_to_cpu((pi)->st) + be32_to_cpu((pi)->siz) <= (hdsiz))
26 static inline int OK_id(char *s
)
28 return memcmp (s
, "GEM", 3) == 0 || memcmp (s
, "BGM", 3) == 0 ||
29 memcmp (s
, "LNX", 3) == 0 || memcmp (s
, "SWP", 3) == 0 ||
30 memcmp (s
, "RAW", 3) == 0 ;
33 int atari_partition(struct parsed_partitions
*state
, struct block_device
*bdev
)
36 struct rootsector
*rs
;
37 struct partition_info
*pi
;
42 int part_fmt
= 0; /* 0:unknown, 1:AHDI, 2:ICD/Supra */
45 rs
= (struct rootsector
*) read_dev_sector(bdev
, 0, §
);
49 /* Verify this is an Atari rootsector: */
50 hd_size
= bdev
->bd_inode
->i_size
>> 9;
51 if (!VALID_PARTITION(&rs
->part
[0], hd_size
) &&
52 !VALID_PARTITION(&rs
->part
[1], hd_size
) &&
53 !VALID_PARTITION(&rs
->part
[2], hd_size
) &&
54 !VALID_PARTITION(&rs
->part
[3], hd_size
)) {
56 * if there's no valid primary partition, assume that no Atari
57 * format partition table (there's no reliable magic or the like
66 for (slot
= 1; pi
< &rs
->part
[4] && slot
< state
->limit
; slot
++, pi
++) {
67 struct rootsector
*xrs
;
73 /* active partition */
74 if (memcmp (pi
->id
, "XGM", 3) != 0) {
75 /* we don't care about other id's */
76 put_partition (state
, slot
, be32_to_cpu(pi
->st
),
77 be32_to_cpu(pi
->siz
));
80 /* extension partition */
85 partsect
= extensect
= be32_to_cpu(pi
->st
);
87 xrs
= (struct rootsector
*)read_dev_sector(bdev
, partsect
, §2
);
89 printk (" block %ld read failed\n", partsect
);
94 /* ++roman: sanity check: bit 0 of flg field must be set */
95 if (!(xrs
->part
[0].flg
& 1)) {
96 printk( "\nFirst sub-partition in extended partition is not valid!\n" );
97 put_dev_sector(sect2
);
101 put_partition(state
, slot
,
102 partsect
+ be32_to_cpu(xrs
->part
[0].st
),
103 be32_to_cpu(xrs
->part
[0].siz
));
105 if (!(xrs
->part
[1].flg
& 1)) {
106 /* end of linked partition list */
107 put_dev_sector(sect2
);
110 if (memcmp( xrs
->part
[1].id
, "XGM", 3 ) != 0) {
111 printk("\nID of extended partition is not XGM!\n");
112 put_dev_sector(sect2
);
116 partsect
= be32_to_cpu(xrs
->part
[1].st
) + extensect
;
117 put_dev_sector(sect2
);
118 if (++slot
== state
->limit
) {
119 printk( "\nMaximum number of partitions reached!\n" );
126 if ( part_fmt
!=1 ) { /* no extended partitions -> test ICD-format */
127 pi
= &rs
->icdpart
[0];
128 /* sanity check: no ICD format if first partition invalid */
131 for (; pi
< &rs
->icdpart
[8] && slot
< state
->limit
; slot
++, pi
++) {
132 /* accept only GEM,BGM,RAW,LNX,SWP partitions */
133 if (!((pi
->flg
& 1) && OK_id(pi
->id
)))
136 put_partition (state
, slot
,
138 be32_to_cpu(pi
->siz
));
144 put_dev_sector(sect
);
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