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#ifndef _ADFS_FS_H
#define _ADFS_FS_H
#include <linux/types.h>
/*
* Structures of data on the disk
*/
/*
* Disc Record at disc address 0xc00
*/
struct adfs_discrecord {
unsigned char log2secsize;
unsigned char secspertrack;
unsigned char heads;
unsigned char density;
unsigned char idlen;
unsigned char log2bpmb;
unsigned char skew;
unsigned char bootoption;
unsigned char lowsector;
unsigned char nzones;
unsigned short zone_spare;
unsigned long root;
unsigned long disc_size;
unsigned short disc_id;
unsigned char disc_name[10];
unsigned long disc_type;
unsigned long disc_size_high;
unsigned char log2sharesize:4;
unsigned char unused:4;
unsigned char big_flag:1;
};
#define ADFS_DISCRECORD (0xc00)
#define ADFS_DR_OFFSET (0x1c0)
#define ADFS_DR_SIZE 60
#define ADFS_SUPER_MAGIC 0xadf5
#define ADFS_FREE_FRAG 0
#define ADFS_BAD_FRAG 1
#define ADFS_ROOT_FRAG 2
/*
* Directory header
*/
struct adfs_dirheader {
unsigned char startmasseq;
unsigned char startname[4];
};
#define ADFS_NEWDIR_SIZE 2048
#define ADFS_OLDDIR_SIZE 1024
#define ADFS_NUM_DIR_ENTRIES 77
/*
* Directory entries
*/
struct adfs_direntry {
char dirobname[10];
#define ADFS_NAME_LEN 10
__u8 dirload[4];
__u8 direxec[4];
__u8 dirlen[4];
__u8 dirinddiscadd[3];
__u8 newdiratts;
#define ADFS_NDA_OWNER_READ (1 << 0)
#define ADFS_NDA_OWNER_WRITE (1 << 1)
#define ADFS_NDA_LOCKED (1 << 2)
#define ADFS_NDA_DIRECTORY (1 << 3)
#define ADFS_NDA_EXECUTE (1 << 4)
#define ADFS_NDA_PUBLIC_READ (1 << 5)
#define ADFS_NDA_PUBLIC_WRITE (1 << 6)
};
#define ADFS_MAX_NAME_LEN 255
struct adfs_idir_entry {
__u32 inode_no; /* Address */
__u32 file_id; /* file id */
__u32 name_len; /* name length */
__u32 size; /* size */
__u32 mtime; /* modification time */
__u32 filetype; /* RiscOS file type */
__u8 mode; /* internal mode */
char name[ADFS_MAX_NAME_LEN]; /* file name */
};
/*
* Directory tail
*/
union adfs_dirtail {
struct {
unsigned char dirlastmask;
char dirname[10];
unsigned char dirparent[3];
char dirtitle[19];
unsigned char reserved[14];
unsigned char endmasseq;
unsigned char endname[4];
unsigned char dircheckbyte;
} old;
struct {
unsigned char dirlastmask;
unsigned char reserved[2];
unsigned char dirparent[3];
char dirtitle[19];
char dirname[10];
unsigned char endmasseq;
unsigned char endname[4];
unsigned char dircheckbyte;
} new;
};
#ifdef __KERNEL__
/*
* 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!!!
*/
extern 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];
}
/* dir.c */
extern unsigned int adfs_val (unsigned char *p, int len);
extern int adfs_dir_read_parent (struct inode *inode, struct buffer_head **bhp);
extern int adfs_dir_read (struct inode *inode, struct buffer_head **bhp);
extern int adfs_dir_check (struct inode *inode, struct buffer_head **bhp,
int buffers, union adfs_dirtail *dtp);
extern void adfs_dir_free (struct buffer_head **bhp, int buffers);
extern int adfs_dir_get (struct super_block *sb, struct buffer_head **bhp,
int buffers, int pos, unsigned long parent_object_id,
struct adfs_idir_entry *ide);
extern int adfs_dir_find_entry (struct super_block *sb, struct buffer_head **bhp,
int buffers, unsigned int index,
struct adfs_idir_entry *ide);
/* inode.c */
extern int adfs_inode_validate (struct inode *inode);
extern unsigned long adfs_inode_generate (unsigned long parent_id, int diridx);
extern unsigned long adfs_inode_objid (struct inode *inode);
extern unsigned int adfs_parent_bmap (struct inode *inode, int block);
extern int adfs_bmap (struct inode *inode, int block);
extern void adfs_read_inode (struct inode *inode);
/* map.c */
extern int adfs_map_lookup (struct super_block *sb, int frag_id, int offset);
/* namei.c */
extern struct dentry *adfs_lookup (struct inode *dir, struct dentry *dentry);
/* super.c */
extern int init_adfs_fs (void);
extern void adfs_error (struct super_block *, const char *, const char *, ...);
/*
* Inodes and file operations
*/
/* dir.c */
extern struct inode_operations adfs_dir_inode_operations;
/* file.c */
extern struct inode_operations adfs_file_inode_operations;
#endif
#endif
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