#include <linux/fs.h>#include <linux/ext2_fs.h>/* * ext2 mount options */struct ext2_mount_options {	unsigned long s_mount_opt;	uid_t s_resuid;	gid_t s_resgid;};/* * second extended file system inode data in memory */struct ext2_inode_info {	__le32	i_data[15];	__u32	i_flags;	__u32	i_faddr;	__u8	i_frag_no;	__u8	i_frag_size;	__u16	i_state;	__u32	i_file_acl;	__u32	i_dir_acl;	__u32	i_dtime;	/*	 * i_block_group is the number of the block group which contains	 * this file's inode.  Constant across the lifetime of the inode,	 * it is ued for making block allocation decisions - we try to	 * place a file's data blocks near its inode block, and new inodes	 * near to their parent directory's inode.	 */	__u32	i_block_group;	/* block reservation info */	struct ext2_block_alloc_info *i_block_alloc_info;	__u32	i_dir_start_lookup;#ifdef CONFIG_EXT2_FS_XATTR	/*	 * Extended attributes can be read independently of the main file	 * data. Taking i_mutex even when reading would cause contention	 * between readers of EAs and writers of regular file data, so	 * instead we synchronize on xattr_sem when reading or changing	 * EAs.	 */	struct rw_semaphore xattr_sem;#endif#ifdef CONFIG_EXT2_FS_POSIX_ACL	struct posix_acl	*i_acl;	struct posix_acl	*i_default_acl;#endif	rwlock_t i_meta_lock;	/*	 * truncate_mutex is for serialising ext2_truncate() against	 * ext2_getblock().  It also protects the internals of the inode's	 * reservation data structures: ext2_reserve_window and	 * ext2_reserve_window_node.	 */	struct mutex truncate_mutex;	struct inode	vfs_inode;	struct list_head i_orphan;	/* unlinked but open inodes */};/* * Inode dynamic state flags */#define EXT2_STATE_NEW			0x00000001 /* inode is newly created *//* * Function prototypes *//* * Ok, these declarations are also in <linux/kernel.h> but none of the * ext2 source programs needs to include it so they are duplicated here. */static inline struct ext2_inode_info *EXT2_I(struct inode *inode){	return container_of(inode, struct ext2_inode_info, vfs_inode);}/* balloc.c */extern int ext2_bg_has_super(struct super_block *sb, int group);extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *);extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,				unsigned long *, int *);extern void ext2_free_blocks (struct inode *, unsigned long,			      unsigned long);extern unsigned long ext2_count_free_blocks (struct super_block *);extern unsigned long ext2_count_dirs (struct super_block *);extern void ext2_check_blocks_bitmap (struct super_block *);extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,						    unsigned int block_group,						    struct buffer_head ** bh);extern void ext2_discard_reservation (struct inode *);extern int ext2_should_retry_alloc(struct super_block *sb, int *retries);extern void ext2_init_block_alloc_info(struct inode *);extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);/* dir.c */extern int ext2_add_link (struct dentry *, struct inode *);extern ino_t ext2_inode_by_name(struct inode *, struct dentry *);extern int ext2_make_empty(struct inode *, struct inode *);extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct dentry *, struct page **);extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);extern int ext2_empty_dir (struct inode *);extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **);extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *);/* fsync.c */extern int ext2_sync_file (struct file *, struct dentry *, int);/* ialloc.c */extern struct inode * ext2_new_inode (struct inode *, int);extern void ext2_free_inode (struct inode *);extern unsigned long ext2_count_free_inodes (struct super_block *);extern void ext2_check_inodes_bitmap (struct super_block *);extern unsigned long ext2_count_free (struct buffer_head *, unsigned);/* inode.c */extern void ext2_read_inode (struct inode *);extern int ext2_write_inode (struct inode *, int);extern void ext2_put_inode (struct inode *);extern void ext2_delete_inode (struct inode *);extern int ext2_sync_inode (struct inode *);extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);extern void ext2_truncate (struct inode *);extern int ext2_setattr (struct dentry *, struct iattr *);extern void ext2_set_inode_flags(struct inode *inode);extern void ext2_get_inode_flags(struct ext2_inode_info *);int __ext2_write_begin(struct file *file, struct address_space *mapping,		loff_t pos, unsigned len, unsigned flags,		struct page **pagep, void **fsdata);/* ioctl.c */extern int ext2_ioctl (struct inode *, struct file *, unsigned int,		       unsigned long);extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);/* namei.c */struct dentry *ext2_get_parent(struct dentry *child);/* super.c */extern void ext2_error (struct super_block *, const char *, const char *, ...)	__attribute__ ((format (printf, 3, 4)));extern void ext2_warning (struct super_block *, const char *, const char *, ...)	__attribute__ ((format (printf, 3, 4)));extern void ext2_update_dynamic_rev (struct super_block *sb);extern void ext2_write_super (struct super_block *);/* * Inodes and files operations *//* dir.c */extern const struct file_operations ext2_dir_operations;/* file.c */extern const struct inode_operations ext2_file_inode_operations;extern const struct file_operations ext2_file_operations;extern const struct file_operations ext2_xip_file_operations;/* inode.c */extern const struct address_space_operations ext2_aops;extern const struct address_space_operations ext2_aops_xip;extern const struct address_space_operations ext2_nobh_aops;/* namei.c */extern const struct inode_operations ext2_dir_inode_operations;extern const struct inode_operations ext2_special_inode_operations;/* symlink.c */extern const struct inode_operations ext2_fast_symlink_inode_operations;extern const struct inode_operations ext2_symlink_inode_operations;static inline ext2_fsblk_text2_group_first_block_no(struct super_block *sb, unsigned long group_no){	return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) +		le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);}