kernel-ark/include/linux/adfs_fs.h
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

77 lines
1.6 KiB
C

#ifndef _ADFS_FS_H
#define _ADFS_FS_H
#include <linux/types.h>
/*
* Disc Record at disc address 0xc00
*/
struct adfs_discrecord {
__u8 log2secsize;
__u8 secspertrack;
__u8 heads;
__u8 density;
__u8 idlen;
__u8 log2bpmb;
__u8 skew;
__u8 bootoption;
__u8 lowsector;
__u8 nzones;
__le16 zone_spare;
__le32 root;
__le32 disc_size;
__le16 disc_id;
__u8 disc_name[10];
__le32 disc_type;
__le32 disc_size_high;
__u8 log2sharesize:4;
__u8 unused40:4;
__u8 big_flag:1;
__u8 unused41:1;
__u8 nzones_high;
__le32 format_version;
__le32 root_size;
__u8 unused52[60 - 52];
};
#define ADFS_DISCRECORD (0xc00)
#define ADFS_DR_OFFSET (0x1c0)
#define ADFS_DR_SIZE 60
#define ADFS_DR_SIZE_BITS (ADFS_DR_SIZE << 3)
#define ADFS_SUPER_MAGIC 0xadf5
#ifdef __KERNEL__
#include <linux/adfs_fs_i.h>
#include <linux/adfs_fs_sb.h>
/*
* Calculate the boot block checksum on an ADFS drive. Note that this will
* appear to be correct if the sector contains all zeros, so also check that
* the disk size is non-zero!!!
*/
static inline int adfs_checkbblk(unsigned char *ptr)
{
unsigned int result = 0;
unsigned char *p = ptr + 511;
do {
result = (result & 0xff) + (result >> 8);
result = result + *--p;
} while (p != ptr);
return (result & 0xff) != ptr[511];
}
static inline struct adfs_sb_info *ADFS_SB(struct super_block *sb)
{
return sb->s_fs_info;
}
static inline struct adfs_inode_info *ADFS_I(struct inode *inode)
{
return container_of(inode, struct adfs_inode_info, vfs_inode);
}
#endif
#endif