#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 struct inode *ext2_iget (struct super_block *, unsigned long); extern int ext2_write_inode (struct inode *, int); 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 long ext2_ioctl(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_t ext2_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); }