1 #ifndef _ADFS_FS_H
2 #define _ADFS_FS_H
3
4 #include <linux/types.h>
5 #include <linux/magic.h>
6
7 /*
8 * Disc Record at disc address 0xc00
9 */
10 struct adfs_discrecord {
11 __u8 log2secsize;
12 __u8 secspertrack;
13 __u8 heads;
14 __u8 density;
15 __u8 idlen;
16 __u8 log2bpmb;
17 __u8 skew;
18 __u8 bootoption;
19 __u8 lowsector;
20 __u8 nzones;
21 __le16 zone_spare;
22 __le32 root;
23 __le32 disc_size;
24 __le16 disc_id;
25 __u8 disc_name[10];
26 __le32 disc_type;
27 __le32 disc_size_high;
28 __u8 log2sharesize:4;
29 __u8 unused40:4;
30 __u8 big_flag:1;
31 __u8 unused41:1;
32 __u8 nzones_high;
33 __le32 format_version;
34 __le32 root_size;
35 __u8 unused52[60 - 52];
36 };
37
38 #define ADFS_DISCRECORD (0xc00)
39 #define ADFS_DR_OFFSET (0x1c0)
40 #define ADFS_DR_SIZE 60
41 #define ADFS_DR_SIZE_BITS (ADFS_DR_SIZE << 3)
42
43 #ifdef __KERNEL__
44 #include <linux/adfs_fs_i.h>
45 #include <linux/adfs_fs_sb.h>
46 /*
47 * Calculate the boot block checksum on an ADFS drive. Note that this will
48 * appear to be correct if the sector contains all zeros, so also check that
49 * the disk size is non-zero!!!
50 */
51 static inline int adfs_checkbblk(unsigned char *ptr)
52 {
53 unsigned int result = 0;
54 unsigned char *p = ptr + 511;
55
56 do {
57 result = (result & 0xff) + (result >> 8);
58 result = result + *--p;
59 } while (p != ptr);
60
61 return (result & 0xff) != ptr[511];
62 }
63
64 static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
65 {
66 return sb->s_fs_info;
67 }
68
69 static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
70 {
71 return container_of(inode, struct adfs_inode_info, vfs_inode);
72 }
73
74 #endif
75
76 #endif
77
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