1 #include <linux/fs.h> 2 #include <linux/ext2_fs.h> 3 4 /* 5 * ext2 mount options 6 */ 7 struct ext2_mount_options { 8 unsigned long s_mount_opt; 9 uid_t s_resuid; 10 gid_t s_resgid; 11 }; 12 13 /* 14 * second extended file system inode data in memory 15 */ 16 struct ext2_inode_info { 17 __le32 i_data[15]; 18 __u32 i_flags; 19 __u32 i_faddr; 20 __u8 i_frag_no; 21 __u8 i_frag_size; 22 __u16 i_state; 23 __u32 i_file_acl; 24 __u32 i_dir_acl; 25 __u32 i_dtime; 26 27 /* 28 * i_block_group is the number of the block group which contains 29 * this file's inode. Constant across the lifetime of the inode, 30 * it is used for making block allocation decisions - we try to 31 * place a file's data blocks near its inode block, and new inodes 32 * near to their parent directory's inode. 33 */ 34 __u32 i_block_group; 35 36 /* block reservation info */ 37 struct ext2_block_alloc_info *i_block_alloc_info; 38 39 __u32 i_dir_start_lookup; 40 #ifdef CONFIG_EXT2_FS_XATTR 41 /* 42 * Extended attributes can be read independently of the main file 43 * data. Taking i_mutex even when reading would cause contention 44 * between readers of EAs and writers of regular file data, so 45 * instead we synchronize on xattr_sem when reading or changing 46 * EAs. 47 */ 48 struct rw_semaphore xattr_sem; 49 #endif 50 rwlock_t i_meta_lock; 51 52 /* 53 * truncate_mutex is for serialising ext2_truncate() against 54 * ext2_getblock(). It also protects the internals of the inode's 55 * reservation data structures: ext2_reserve_window and 56 * ext2_reserve_window_node. 57 */ 58 struct mutex truncate_mutex; 59 struct inode vfs_inode; 60 struct list_head i_orphan; /* unlinked but open inodes */ 61 }; 62 63 /* 64 * Inode dynamic state flags 65 */ 66 #define EXT2_STATE_NEW 0x00000001 /* inode is newly created */ 67 68 69 /* 70 * Function prototypes 71 */ 72 73 /* 74 * Ok, these declarations are also in <linux/kernel.h> but none of the 75 * ext2 source programs needs to include it so they are duplicated here. 76 */ 77 78 static inline struct ext2_inode_info *EXT2_I(struct inode *inode) 79 { 80 return container_of(inode, struct ext2_inode_info, vfs_inode); 81 } 82 83 /* balloc.c */ 84 extern int ext2_bg_has_super(struct super_block *sb, int group); 85 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); 86 extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *); 87 extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long, 88 unsigned long *, int *); 89 extern void ext2_free_blocks (struct inode *, unsigned long, 90 unsigned long); 91 extern unsigned long ext2_count_free_blocks (struct super_block *); 92 extern unsigned long ext2_count_dirs (struct super_block *); 93 extern void ext2_check_blocks_bitmap (struct super_block *); 94 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, 95 unsigned int block_group, 96 struct buffer_head ** bh); 97 extern void ext2_discard_reservation (struct inode *); 98 extern int ext2_should_retry_alloc(struct super_block *sb, int *retries); 99 extern void ext2_init_block_alloc_info(struct inode *); 100 extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv); 101 102 /* dir.c */ 103 extern int ext2_add_link (struct dentry *, struct inode *); 104 extern ino_t ext2_inode_by_name(struct inode *, struct qstr *); 105 extern int ext2_make_empty(struct inode *, struct inode *); 106 extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct qstr *, struct page **); 107 extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *); 108 extern int ext2_empty_dir (struct inode *); 109 extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **); 110 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *, int); 111 112 /* ialloc.c */ 113 extern struct inode * ext2_new_inode (struct inode *, int); 114 extern void ext2_free_inode (struct inode *); 115 extern unsigned long ext2_count_free_inodes (struct super_block *); 116 extern void ext2_check_inodes_bitmap (struct super_block *); 117 extern unsigned long ext2_count_free (struct buffer_head *, unsigned); 118 119 /* inode.c */ 120 extern struct inode *ext2_iget (struct super_block *, unsigned long); 121 extern int ext2_write_inode (struct inode *, int); 122 extern void ext2_delete_inode (struct inode *); 123 extern int ext2_sync_inode (struct inode *); 124 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int); 125 extern void ext2_truncate (struct inode *); 126 extern int ext2_setattr (struct dentry *, struct iattr *); 127 extern void ext2_set_inode_flags(struct inode *inode); 128 extern void ext2_get_inode_flags(struct ext2_inode_info *); 129 extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 130 u64 start, u64 len); 131 int __ext2_write_begin(struct file *file, struct address_space *mapping, 132 loff_t pos, unsigned len, unsigned flags, 133 struct page **pagep, void **fsdata); 134 135 /* ioctl.c */ 136 extern long ext2_ioctl(struct file *, unsigned int, unsigned long); 137 extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long); 138 139 /* namei.c */ 140 struct dentry *ext2_get_parent(struct dentry *child); 141 142 /* super.c */ 143 extern void ext2_error (struct super_block *, const char *, const char *, ...) 144 __attribute__ ((format (printf, 3, 4))); 145 extern void ext2_msg(struct super_block *, const char *, const char *, ...) 146 __attribute__ ((format (printf, 3, 4))); 147 extern void ext2_update_dynamic_rev (struct super_block *sb); 148 extern void ext2_write_super (struct super_block *); 149 150 /* 151 * Inodes and files operations 152 */ 153 154 /* dir.c */ 155 extern const struct file_operations ext2_dir_operations; 156 157 /* file.c */ 158 extern int ext2_fsync(struct file *file, struct dentry *dentry, int datasync); 159 extern const struct inode_operations ext2_file_inode_operations; 160 extern const struct file_operations ext2_file_operations; 161 extern const struct file_operations ext2_xip_file_operations; 162 163 /* inode.c */ 164 extern const struct address_space_operations ext2_aops; 165 extern const struct address_space_operations ext2_aops_xip; 166 extern const struct address_space_operations ext2_nobh_aops; 167 168 /* namei.c */ 169 extern const struct inode_operations ext2_dir_inode_operations; 170 extern const struct inode_operations ext2_special_inode_operations; 171 172 /* symlink.c */ 173 extern const struct inode_operations ext2_fast_symlink_inode_operations; 174 extern const struct inode_operations ext2_symlink_inode_operations; 175 176 static inline ext2_fsblk_t 177 ext2_group_first_block_no(struct super_block *sb, unsigned long group_no) 178 { 179 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) + 180 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block); 181 } 182