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 */
10struct 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 */
51static 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
64static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
65{
66	return sb->s_fs_info;
67}
68
69static 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