include/linux/ext2_fs.h - pub/scm/linux/kernel/git/nico/archive - Git at Google

 #ifndef _LINUX_EXT2_FS_H
 #define _LINUX_EXT2_FS_H

 /*
  * The second extended filesystem constants/structures
  */

 /*
  * Define EXT2FS_DEBUG to produce debug messages
  */
 #undef EXT2FS_DEBUG

 /*
  * Define EXT2FS_PRE_02B_COMPAT to convert ext 2 fs prior to 0.2b
  */
 #undef EXT2FS_PRE_02B_COMPAT

 /*
  * Define DONT_USE_DCACHE to inhibit the directory cache
  */
 #undef DONT_USE_DCACHE

 /*
  * Define EXT2FS_DEBUG_CACHE to produce cache debug messages
  */
 #undef EXT2FS_DEBUG_CACHE

 /*
  * The second extended file system version
  */
 #define EXT2FS_DATE		"93/08/05"
 #define EXT2FS_VERSION		"0.3c"

 /*
  * Special inodes numbers
  */
 #define	EXT2_BAD_INO		 1	/* Bad blocks inode */
 #define EXT2_ROOT_INO		 2	/* Root inode */
 #define EXT2_ACL_IDX_INO	 3	/* ACL inode */
 #define EXT2_ACL_DATA_INO	 4	/* ACL inode */
 #define EXT2_BOOT_LOADER_INO	 5	/* Boot loader inode */
 #define EXT2_FIRST_INO		11	/* First non reserved inode */

 /*
  * The second extended file system magic number
  */
 #define EXT2_OLD_SUPER_MAGIC	0xEF51
 #define EXT2_SUPER_MAGIC	0xEF53

 /*
  * Maximal count of links to a file
  */
 #define EXT2_LINK_MAX		32000

 /*
  * Macro-instructions used to manage several block sizes
  */
 #define EXT2_MIN_BLOCK_SIZE		1024
 #define	EXT2_MAX_BLOCK_SIZE		4096
 #define EXT2_MIN_BLOCK_LOG_SIZE		  10
 #ifdef __KERNEL__
 # define EXT2_BLOCK_SIZE(s)		((s)->s_blocksize)
 #else
 # define EXT2_BLOCK_SIZE(s)		(EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
 #endif
 #define EXT2_ACLE_PER_BLOCK(s)		(EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry))
 #define	EXT2_ADDR_PER_BLOCK(s)		(EXT2_BLOCK_SIZE(s) / sizeof (unsigned long))
 #ifdef __KERNEL__
 # define EXT2_BLOCK_SIZE_BITS(s)	((s)->u.ext2_sb.s_es->s_log_block_size + 10)
 #else
 # define EXT2_BLOCK_SIZE_BITS(s)	((s)->s_log_block_size + 10)
 #endif
 #define	EXT2_INODES_PER_BLOCK(s)	(EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_inode))

 /*
  * Macro-instructions used to manage fragments
  */
 #define EXT2_MIN_FRAG_SIZE		1024
 #define	EXT2_MAX_FRAG_SIZE		4096
 #define EXT2_MIN_FRAG_LOG_SIZE		  10
 #ifdef __KERNEL__
 # define EXT2_FRAG_SIZE(s)		((s)->u.ext2_sb.s_frag_size)
 # define EXT2_FRAGS_PER_BLOCK(s)	((s)->u.ext2_sb.s_frags_per_block)
 #else
 # define EXT2_FRAG_SIZE(s)		(EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
 # define EXT2_FRAGS_PER_BLOCK(s)	(EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
 #endif

 /*
  * ACL structures
  */
 struct ext2_acl_header	/* Header of Access Control Lists */
 {
 	unsigned long aclh_size;
 	unsigned long aclh_file_count;
 	unsigned long aclh_acle_count;
 	unsigned long aclh_first_acle;
 };

 struct ext2_acl_entry	/* Access Control List Entry */
 {
 	unsigned long  acle_size;
 	unsigned short acle_perms;	/* Access permissions */
 	unsigned short acle_type;	/* Type of entry */
 	unsigned short acle_tag;	/* User or group identity */
 	unsigned short acle_pad1;
 	unsigned long  acle_next;	/* Pointer on next entry for the */
 					/* same inode or on next free entry */
 };

 /*
  * Structure of a blocks group descriptor
  */
 struct ext2_old_group_desc
 {
 	unsigned long  bg_block_bitmap;		/* Blocks bitmap block */
 	unsigned long  bg_inode_bitmap;		/* Inodes bitmap block */
 	unsigned long  bg_inode_table;		/* Inodes table block */
 	unsigned short bg_free_blocks_count;	/* Free blocks count */
 	unsigned short bg_free_inodes_count;	/* Free inodes count */
 };

 struct ext2_group_desc
 {
 	unsigned long  bg_block_bitmap;		/* Blocks bitmap block */
 	unsigned long  bg_inode_bitmap;		/* Inodes bitmap block */
 	unsigned long  bg_inode_table;		/* Inodes table block */
 	unsigned short bg_free_blocks_count;	/* Free blocks count */
 	unsigned short bg_free_inodes_count;	/* Free inodes count */
 	unsigned short bg_used_dirs_count;	/* Directories count */
 	unsigned short bg_pad;
 	unsigned long  bg_reserved[3];
 };

 /*
  * Macro-instructions used to manage group descriptors
  */
 #ifdef __KERNEL__
 # define EXT2_BLOCKS_PER_GROUP(s)	((s)->u.ext2_sb.s_blocks_per_group)
 # define EXT2_DESC_PER_BLOCK(s)		((s)->u.ext2_sb.s_desc_per_block)
 # define EXT2_INODES_PER_GROUP(s)	((s)->u.ext2_sb.s_inodes_per_group)
 #else
 # define EXT2_BLOCKS_PER_GROUP(s)	((s)->s_blocks_per_group)
 # define EXT2_DESC_PER_BLOCK(s)		(EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
 # define EXT2_INODES_PER_GROUP(s)	((s)->s_inodes_per_group)
 #endif

 /*
  * Constants relative to the data blocks
  */
 #define	EXT2_NDIR_BLOCKS		12
 #define	EXT2_IND_BLOCK			EXT2_NDIR_BLOCKS
 #define	EXT2_DIND_BLOCK			(EXT2_IND_BLOCK + 1)
 #define	EXT2_TIND_BLOCK			(EXT2_DIND_BLOCK + 1)
 #define	EXT2_N_BLOCKS			(EXT2_TIND_BLOCK + 1)

 /*
  * Structure of an inode on the disk
  */
 struct ext2_inode {
 	unsigned short i_mode;		/* File mode */
 	unsigned short i_uid;		/* Owner Uid */
 	unsigned long  i_size;		/* Size in bytes */
 	unsigned long  i_atime;		/* Access time */
 	unsigned long  i_ctime;		/* Creation time */
 	unsigned long  i_mtime;		/* Modification time */
 	unsigned long  i_dtime;		/* Deletion Time */
 	unsigned short i_gid;		/* Group Id */
 	unsigned short i_links_count;	/* Links count */
 	unsigned long  i_blocks;	/* Blocks count */
 	unsigned long  i_flags;		/* File flags */
 	unsigned long  i_reserved1;
 	unsigned long  i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
 	unsigned long  i_version;	/* File version (for NFS) */
 	unsigned long  i_file_acl;	/* File ACL */
 	unsigned long  i_dir_acl;	/* Directory ACL */
 	unsigned long  i_faddr;		/* Fragment address */
 	unsigned char  i_frag;		/* Fragment number */
 	unsigned char  i_fsize;		/* Fragment size */
 	unsigned short i_pad1;
 	unsigned long  i_reserved2[2];
 };

 /*
  * Structure of the super block
  */
 struct ext2_super_block {
 	unsigned long  s_inodes_count;	/* Inodes count */
 	unsigned long  s_blocks_count;	/* Blocks count */
 	unsigned long  s_r_blocks_count;/* Reserved blocks count */
 	unsigned long  s_free_blocks_count;/* Free blocks count */
 	unsigned long  s_free_inodes_count;/* Free inodes count */
 	unsigned long  s_first_data_block;/* First Data Block */
 	unsigned long  s_log_block_size;/* Block size */
 	long           s_log_frag_size;	/* Fragment size */
 	unsigned long  s_blocks_per_group;/* # Blocks per group */
 	unsigned long  s_frags_per_group;/* # Fragments per group */
 	unsigned long  s_inodes_per_group;/* # Inodes per group */
 	unsigned long  s_mtime;		/* Mount time */
 	unsigned long  s_wtime;		/* Write time */
 	unsigned long  s_pad;		/* Padding to get the magic signature*/
 					/* at the same offset as in the */
 					/* previous ext fs */
 	unsigned short s_magic;		/* Magic signature */
 	unsigned short s_valid;		/* Flag */
 	unsigned long  s_reserved[243];	/* Padding to the end of the block */
 };

 /*
  * Structure of a directory entry
  */
 #define EXT2_NAME_LEN 255

 struct ext2_dir_entry {
 	unsigned long  inode;			/* Inode number */
 	unsigned short rec_len;			/* Directory entry length */
 	unsigned short name_len;		/* Name length */
 	char           name[EXT2_NAME_LEN];	/* File name */
 };

 /*
  * EXT2_DIR_PAD defines the directory entries boundaries
  *
  * NOTE: It must be a multiple of 4
  */
 #define EXT2_DIR_PAD		 	4
 #define EXT2_DIR_ROUND 			(EXT2_DIR_PAD - 1)
 #define EXT2_DIR_REC_LEN(name_len)	(((name_len) + 8 + EXT2_DIR_ROUND) & \
 					 ~EXT2_DIR_ROUND)

 #ifdef __KERNEL__
 /*
  * Function prototypes
  */

 /* acl.c */
 extern int ext2_permission (struct inode *, int);

 /* balloc.c */
 extern int ext2_new_block (struct super_block *, unsigned long);
 extern void ext2_free_block (struct super_block *, unsigned long);
 extern unsigned long ext2_count_free_blocks (struct super_block *);

 /* bitmap.c */
 extern unsigned long ext2_count_free (struct buffer_head *, unsigned);

 /* dcache.c */
 extern void ext2_dcache_invalidate (unsigned short);
 extern unsigned long ext2_dcache_lookup (unsigned short, unsigned long,
 					 const char *, int);
 extern void ext2_dcache_add (unsigned short, unsigned long, const char *,
 			     int, int);
 extern void ext2_dcache_remove (unsigned short, unsigned long, const char *,
 				int);

 /* dir.c */
 extern int ext2_check_dir_entry (char *, struct inode *,
 				 struct ext2_dir_entry *, struct buffer_head *,
 				 unsigned int);

 /* file.c */
 extern int ext2_read (struct inode *, struct file *, char *, int);
 extern int ext2_write (struct inode *, struct file *, char *, int);

 /* fsync.c */
 extern int ext2_sync_file (struct inode *, struct file *);

 /* ialloc.c */
 extern struct inode * ext2_new_inode (const struct inode *, int);
 extern void ext2_free_inode (struct inode *);
 extern unsigned long ext2_count_free_inodes (struct super_block *);

 /* inode.c */
 extern int ext2_bmap (struct inode *, int);

 extern struct buffer_head * ext2_getblk (struct inode *, int, int, int *);
 extern struct buffer_head * ext2_bread (struct inode *, int, int, int *);

 extern void ext2_put_super (struct super_block *);
 extern void ext2_write_super (struct super_block *);
 extern int ext2_remount (struct super_block *, int *);
 extern struct super_block * ext2_read_super (struct super_block *,void *,int);
 extern void ext2_read_inode (struct inode *);
 extern void ext2_write_inode (struct inode *);
 extern void ext2_put_inode (struct inode *);
 extern void ext2_statfs (struct super_block *, struct statfs *);
 extern int ext2_sync_inode(struct inode *);

 /* ioctl.c */
 extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
 		       unsigned long);

 /* namei.c */
 extern int ext2_open (struct inode *, struct file *);
 extern void ext2_release (struct inode *, struct file *);
 extern int ext2_lookup (struct inode *,const char *, int, struct inode **);
 extern int ext2_create (struct inode *,const char *, int, int,
 			struct inode **);
 extern int ext2_mkdir (struct inode *, const char *, int, int);
 extern int ext2_rmdir (struct inode *, const char *, int);
 extern int ext2_unlink (struct inode *, const char *, int);
 extern int ext2_symlink (struct inode *, const char *, int, const char *);
 extern int ext2_link (struct inode *, struct inode *, const char *, int);
 extern int ext2_mknod (struct inode *, const char *, int, int, int);
 extern int ext2_rename (struct inode *, const char *, int,
 			struct inode *, const char *, int);

 /* truncate.c */
 extern void ext2_truncate (struct inode *);

 /*
  * Inodes and files operations
  */

 /* dir.c */
 extern struct inode_operations ext2_dir_inode_operations;

 /* file.c */
 extern struct inode_operations ext2_file_inode_operations;

 /* symlink.c */
 extern struct inode_operations ext2_symlink_inode_operations;

 #endif

 #endif
	#ifndef _LINUX_EXT2_FS_H
	#define _LINUX_EXT2_FS_H

	/*
	* The second extended filesystem constants/structures
	*/

	/*
	* Define EXT2FS_DEBUG to produce debug messages
	*/
	#undef EXT2FS_DEBUG

	/*
	* Define EXT2FS_PRE_02B_COMPAT to convert ext 2 fs prior to 0.2b
	*/
	#undef EXT2FS_PRE_02B_COMPAT

	/*
	* Define DONT_USE_DCACHE to inhibit the directory cache
	*/
	#undef DONT_USE_DCACHE

	/*
	* Define EXT2FS_DEBUG_CACHE to produce cache debug messages
	*/
	#undef EXT2FS_DEBUG_CACHE

	/*
	* The second extended file system version
	*/
	#define EXT2FS_DATE "93/08/05"
	#define EXT2FS_VERSION "0.3c"

	/*
	* Special inodes numbers
	*/
	#define EXT2_BAD_INO 1 /* Bad blocks inode */
	#define EXT2_ROOT_INO 2 /* Root inode */
	#define EXT2_ACL_IDX_INO 3 /* ACL inode */
	#define EXT2_ACL_DATA_INO 4 /* ACL inode */
	#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
	#define EXT2_FIRST_INO 11 /* First non reserved inode */

	/*
	* The second extended file system magic number
	*/
	#define EXT2_OLD_SUPER_MAGIC 0xEF51
	#define EXT2_SUPER_MAGIC 0xEF53

	/*
	* Maximal count of links to a file
	*/
	#define EXT2_LINK_MAX 32000

	/*
	* Macro-instructions used to manage several block sizes
	*/
	#define EXT2_MIN_BLOCK_SIZE 1024
	#define EXT2_MAX_BLOCK_SIZE 4096
	#define EXT2_MIN_BLOCK_LOG_SIZE 10
	#ifdef __KERNEL__
	# define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
	#else
	# define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
	#endif
	#define EXT2_ACLE_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry))
	#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (unsigned long))
	#ifdef __KERNEL__
	# define EXT2_BLOCK_SIZE_BITS(s) ((s)->u.ext2_sb.s_es->s_log_block_size + 10)
	#else
	# define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
	#endif
	#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_inode))

	/*
	* Macro-instructions used to manage fragments
	*/
	#define EXT2_MIN_FRAG_SIZE 1024
	#define EXT2_MAX_FRAG_SIZE 4096
	#define EXT2_MIN_FRAG_LOG_SIZE 10
	#ifdef __KERNEL__
	# define EXT2_FRAG_SIZE(s) ((s)->u.ext2_sb.s_frag_size)
	# define EXT2_FRAGS_PER_BLOCK(s) ((s)->u.ext2_sb.s_frags_per_block)
	#else
	# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
	# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
	#endif

	/*
	* ACL structures
	*/
	struct ext2_acl_header /* Header of Access Control Lists */
	{
	unsigned long aclh_size;
	unsigned long aclh_file_count;
	unsigned long aclh_acle_count;
	unsigned long aclh_first_acle;
	};

	struct ext2_acl_entry /* Access Control List Entry */
	{
	unsigned long acle_size;
	unsigned short acle_perms; /* Access permissions */
	unsigned short acle_type; /* Type of entry */
	unsigned short acle_tag; /* User or group identity */
	unsigned short acle_pad1;
	unsigned long acle_next; /* Pointer on next entry for the */
	/* same inode or on next free entry */
	};

	/*
	* Structure of a blocks group descriptor
	*/
	struct ext2_old_group_desc
	{
	unsigned long bg_block_bitmap; /* Blocks bitmap block */
	unsigned long bg_inode_bitmap; /* Inodes bitmap block */
	unsigned long bg_inode_table; /* Inodes table block */
	unsigned short bg_free_blocks_count; /* Free blocks count */
	unsigned short bg_free_inodes_count; /* Free inodes count */
	};

	struct ext2_group_desc
	{
	unsigned long bg_block_bitmap; /* Blocks bitmap block */
	unsigned long bg_inode_bitmap; /* Inodes bitmap block */
	unsigned long bg_inode_table; /* Inodes table block */
	unsigned short bg_free_blocks_count; /* Free blocks count */
	unsigned short bg_free_inodes_count; /* Free inodes count */
	unsigned short bg_used_dirs_count; /* Directories count */
	unsigned short bg_pad;
	unsigned long bg_reserved[3];
	};

	/*
	* Macro-instructions used to manage group descriptors
	*/
	#ifdef __KERNEL__
	# define EXT2_BLOCKS_PER_GROUP(s) ((s)->u.ext2_sb.s_blocks_per_group)
	# define EXT2_DESC_PER_BLOCK(s) ((s)->u.ext2_sb.s_desc_per_block)
	# define EXT2_INODES_PER_GROUP(s) ((s)->u.ext2_sb.s_inodes_per_group)
	#else
	# define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
	# define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
	# define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
	#endif

	/*
	* Constants relative to the data blocks
	*/
	#define EXT2_NDIR_BLOCKS 12
	#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
	#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
	#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
	#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)

	/*
	* Structure of an inode on the disk
	*/
	struct ext2_inode {
	unsigned short i_mode; /* File mode */
	unsigned short i_uid; /* Owner Uid */
	unsigned long i_size; /* Size in bytes */
	unsigned long i_atime; /* Access time */
	unsigned long i_ctime; /* Creation time */
	unsigned long i_mtime; /* Modification time */
	unsigned long i_dtime; /* Deletion Time */
	unsigned short i_gid; /* Group Id */
	unsigned short i_links_count; /* Links count */
	unsigned long i_blocks; /* Blocks count */
	unsigned long i_flags; /* File flags */
	unsigned long i_reserved1;
	unsigned long i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
	unsigned long i_version; /* File version (for NFS) */
	unsigned long i_file_acl; /* File ACL */
	unsigned long i_dir_acl; /* Directory ACL */
	unsigned long i_faddr; /* Fragment address */
	unsigned char i_frag; /* Fragment number */
	unsigned char i_fsize; /* Fragment size */
	unsigned short i_pad1;
	unsigned long i_reserved2[2];
	};

	/*
	* Structure of the super block
	*/
	struct ext2_super_block {
	unsigned long s_inodes_count; /* Inodes count */
	unsigned long s_blocks_count; /* Blocks count */
	unsigned long s_r_blocks_count;/* Reserved blocks count */
	unsigned long s_free_blocks_count;/* Free blocks count */
	unsigned long s_free_inodes_count;/* Free inodes count */
	unsigned long s_first_data_block;/* First Data Block */
	unsigned long s_log_block_size;/* Block size */
	long s_log_frag_size; /* Fragment size */
	unsigned long s_blocks_per_group;/* # Blocks per group */
	unsigned long s_frags_per_group;/* # Fragments per group */
	unsigned long s_inodes_per_group;/* # Inodes per group */
	unsigned long s_mtime; /* Mount time */
	unsigned long s_wtime; /* Write time */
	unsigned long s_pad; /* Padding to get the magic signature*/
	/* at the same offset as in the */
	/* previous ext fs */
	unsigned short s_magic; /* Magic signature */
	unsigned short s_valid; /* Flag */
	unsigned long s_reserved[243]; /* Padding to the end of the block */
	};

	/*
	* Structure of a directory entry
	*/
	#define EXT2_NAME_LEN 255

	struct ext2_dir_entry {
	unsigned long inode; /* Inode number */
	unsigned short rec_len; /* Directory entry length */
	unsigned short name_len; /* Name length */
	char name[EXT2_NAME_LEN]; /* File name */
	};

	/*
	* EXT2_DIR_PAD defines the directory entries boundaries
	*
	* NOTE: It must be a multiple of 4
	*/
	#define EXT2_DIR_PAD 4
	#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
	#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
	~EXT2_DIR_ROUND)

	#ifdef __KERNEL__
	/*
	* Function prototypes
	*/

	/* acl.c */
	extern int ext2_permission (struct inode *, int);

	/* balloc.c */
	extern int ext2_new_block (struct super_block *, unsigned long);
	extern void ext2_free_block (struct super_block *, unsigned long);
	extern unsigned long ext2_count_free_blocks (struct super_block *);

	/* bitmap.c */
	extern unsigned long ext2_count_free (struct buffer_head *, unsigned);

	/* dcache.c */
	extern void ext2_dcache_invalidate (unsigned short);
	extern unsigned long ext2_dcache_lookup (unsigned short, unsigned long,
	const char *, int);
	extern void ext2_dcache_add (unsigned short, unsigned long, const char *,
	int, int);
	extern void ext2_dcache_remove (unsigned short, unsigned long, const char *,
	int);

	/* dir.c */
	extern int ext2_check_dir_entry (char , struct inode ,
	struct ext2_dir_entry , struct buffer_head ,
	unsigned int);

	/* file.c */
	extern int ext2_read (struct inode , struct file , char *, int);
	extern int ext2_write (struct inode , struct file , char *, int);

	/* fsync.c */
	extern int ext2_sync_file (struct inode , struct file );

	/* ialloc.c */
	extern struct inode * ext2_new_inode (const struct inode *, int);
	extern void ext2_free_inode (struct inode *);
	extern unsigned long ext2_count_free_inodes (struct super_block *);

	/* inode.c */
	extern int ext2_bmap (struct inode *, int);

	extern struct buffer_head * ext2_getblk (struct inode , int, int, int );
	extern struct buffer_head * ext2_bread (struct inode , int, int, int );

	extern void ext2_put_super (struct super_block *);
	extern void ext2_write_super (struct super_block *);
	extern int ext2_remount (struct super_block , int );
	extern struct super_block * ext2_read_super (struct super_block ,void ,int);
	extern void ext2_read_inode (struct inode *);
	extern void ext2_write_inode (struct inode *);
	extern void ext2_put_inode (struct inode *);
	extern void ext2_statfs (struct super_block , struct statfs );
	extern int ext2_sync_inode(struct inode *);

	/* ioctl.c */
	extern int ext2_ioctl (struct inode , struct file , unsigned int,
	unsigned long);

	/* namei.c */
	extern int ext2_open (struct inode , struct file );
	extern void ext2_release (struct inode , struct file );
	extern int ext2_lookup (struct inode ,const char , int, struct inode **);
	extern int ext2_create (struct inode ,const char , int, int,
	struct inode **);
	extern int ext2_mkdir (struct inode , const char , int, int);
	extern int ext2_rmdir (struct inode , const char , int);
	extern int ext2_unlink (struct inode , const char , int);
	extern int ext2_symlink (struct inode , const char , int, const char *);
	extern int ext2_link (struct inode , struct inode , const char *, int);
	extern int ext2_mknod (struct inode , const char , int, int, int);
	extern int ext2_rename (struct inode , const char , int,
	struct inode , const char , int);

	/* truncate.c */
	extern void ext2_truncate (struct inode *);

	/*
	* Inodes and files operations
	*/

	/* dir.c */
	extern struct inode_operations ext2_dir_inode_operations;

	/* file.c */
	extern struct inode_operations ext2_file_inode_operations;

	/* symlink.c */
	extern struct inode_operations ext2_symlink_inode_operations;

	#endif

	#endif