#ifndef _LINUX_EXT_FS_H#define _LINUX_EXT_FS_H/* * The ext filesystem constants/structures */#define EXT_NAME_LEN 255#define EXT_ROOT_INO 1#define EXT_SUPER_MAGIC 0x137D#define EXT_INODES_PER_BLOCK ((BLOCK_SIZE)/(sizeof (struct ext_inode)))struct ext_inode {	unsigned short i_mode;	unsigned short i_uid;	unsigned long i_size;	unsigned long i_time;	unsigned short i_gid;	unsigned short i_nlinks;	unsigned long i_zone[12];};struct ext_free_inode {	unsigned long count;	unsigned long free[14];	unsigned long next;};struct ext_free_block {	unsigned long count;	unsigned long free[254];	unsigned long next;};struct ext_super_block {	unsigned long s_ninodes;	unsigned long s_nzones;	unsigned long s_firstfreeblock;	unsigned long s_freeblockscount;	unsigned long s_firstfreeinode;	unsigned long s_freeinodescount;	unsigned long s_firstdatazone;	unsigned long s_log_zone_size;	unsigned long s_max_size;	unsigned long s_reserved1;	unsigned long s_reserved2;	unsigned long s_reserved3;	unsigned long s_reserved4;	unsigned long s_reserved5;	unsigned short s_magic;};struct ext_dir_entry {	unsigned long inode;	unsigned short rec_len;	unsigned short name_len;	char name[EXT_NAME_LEN];};extern int ext_open(struct inode * inode, struct file * filp);extern void ext_release(struct inode * inode, struct file * filp);extern int ext_lookup(struct inode * dir,const char * name, int len,	struct inode ** result);extern int ext_create(struct inode * dir,const char * name, int len, int mode,	struct inode ** result);extern int ext_mkdir(struct inode * dir, const char * name, int len, int mode);extern int ext_rmdir(struct inode * dir, const char * name, int len);extern int ext_unlink(struct inode * dir, const char * name, int len);extern int ext_symlink(struct inode * inode, const char * name, int len,	const char * symname);extern int ext_link(struct inode * oldinode, struct inode * dir, const char * name, int len);extern int ext_mknod(struct inode * dir, const char * name, int len, int mode, int rdev);extern int ext_rename(struct inode * old_dir, const char * old_name, int old_len,	struct inode * new_dir, const char * new_name, int new_len);extern struct inode * ext_new_inode(const struct inode * dir);extern void ext_free_inode(struct inode * inode);extern unsigned long ext_count_free_inodes(struct super_block *sb);extern int ext_new_block(struct super_block * sb);extern void ext_free_block(struct super_block * sb, int block);extern unsigned long ext_count_free_blocks(struct super_block *sb);extern int ext_bmap(struct inode *,int);extern struct buffer_head * ext_getblk(struct inode *, int, int);extern struct buffer_head * ext_bread(struct inode *, int, int);extern void ext_truncate(struct inode *);extern void ext_put_super(struct super_block *);extern void ext_write_super(struct super_block *);extern struct super_block *ext_read_super(struct super_block *,void *,int);extern void ext_read_inode(struct inode *);extern void ext_write_inode(struct inode *);extern void ext_put_inode(struct inode *);extern void ext_statfs(struct super_block *, struct statfs *);extern int ext_sync_inode(struct inode *);extern int ext_sync_file(struct inode *, struct file *);extern int ext_lseek(struct inode *, struct file *, off_t, int);extern int ext_read(struct inode *, struct file *, char *, int);extern int ext_write(struct inode *, struct file *, char *, int);extern struct inode_operations ext_file_inode_operations;extern struct inode_operations ext_dir_inode_operations;extern struct inode_operations ext_symlink_inode_operations;#endif