1#include <linux/fs.h> 2#include <linux/ext2_fs.h> 3 4/* 5 * ext2 mount options 6 */ 7struct 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 */ 16struct 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 ued 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 /* 37 * i_next_alloc_block is the logical (file-relative) number of the 38 * most-recently-allocated block in this file. Yes, it is misnamed. 39 * We use this for detecting linearly ascending allocation requests. 40 */ 41 __u32 i_next_alloc_block; 42 43 /* 44 * i_next_alloc_goal is the *physical* companion to i_next_alloc_block. 45 * it the the physical block number of the block which was most-recently 46 * allocated to this file. This give us the goal (target) for the next 47 * allocation when we detect linearly ascending requests. 48 */ 49 __u32 i_next_alloc_goal; 50 __u32 i_prealloc_block; 51 __u32 i_prealloc_count; 52 __u32 i_dir_start_lookup; 53#ifdef CONFIG_EXT2_FS_XATTR 54 /* 55 * Extended attributes can be read independently of the main file 56 * data. Taking i_mutex even when reading would cause contention 57 * between readers of EAs and writers of regular file data, so 58 * instead we synchronize on xattr_sem when reading or changing 59 * EAs. 60 */ 61 struct rw_semaphore xattr_sem; 62#endif 63#ifdef CONFIG_EXT2_FS_POSIX_ACL 64 struct posix_acl *i_acl; 65 struct posix_acl *i_default_acl; 66#endif 67 rwlock_t i_meta_lock; 68 struct inode vfs_inode; 69}; 70 71/* 72 * Inode dynamic state flags 73 */ 74#define EXT2_STATE_NEW 0x00000001 /* inode is newly created */ 75 76 77/* 78 * Function prototypes 79 */ 80 81/* 82 * Ok, these declarations are also in <linux/kernel.h> but none of the 83 * ext2 source programs needs to include it so they are duplicated here. 84 */ 85 86static inline struct ext2_inode_info *EXT2_I(struct inode *inode) 87{ 88 return container_of(inode, struct ext2_inode_info, vfs_inode); 89} 90 91/* balloc.c */ 92extern int ext2_bg_has_super(struct super_block *sb, int group); 93extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group); 94extern int ext2_new_block (struct inode *, unsigned long, 95 __u32 *, __u32 *, int *); 96extern void ext2_free_blocks (struct inode *, unsigned long, 97 unsigned long); 98extern unsigned long ext2_count_free_blocks (struct super_block *); 99extern unsigned long ext2_count_dirs (struct super_block *); 100extern void ext2_check_blocks_bitmap (struct super_block *); 101extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb, 102 unsigned int block_group, 103 struct buffer_head ** bh); 104 105/* dir.c */ 106extern int ext2_add_link (struct dentry *, struct inode *); 107extern ino_t ext2_inode_by_name(struct inode *, struct dentry *); 108extern int ext2_make_empty(struct inode *, struct inode *); 109extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct dentry *, struct page **); 110extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *); 111extern int ext2_empty_dir (struct inode *); 112extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **); 113extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *); 114 115/* fsync.c */ 116extern int ext2_sync_file (struct file *, struct dentry *, int); 117 118/* ialloc.c */ 119extern struct inode * ext2_new_inode (struct inode *, int); 120extern void ext2_free_inode (struct inode *); 121extern unsigned long ext2_count_free_inodes (struct super_block *); 122extern void ext2_check_inodes_bitmap (struct super_block *); 123extern unsigned long ext2_count_free (struct buffer_head *, unsigned); 124 125/* inode.c */ 126extern void ext2_read_inode (struct inode *); 127extern int ext2_write_inode (struct inode *, int); 128extern void ext2_put_inode (struct inode *); 129extern void ext2_delete_inode (struct inode *); 130extern int ext2_sync_inode (struct inode *); 131extern void ext2_discard_prealloc (struct inode *); 132extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int); 133extern void ext2_truncate (struct inode *); 134extern int ext2_setattr (struct dentry *, struct iattr *); 135extern void ext2_set_inode_flags(struct inode *inode); 136extern void ext2_get_inode_flags(struct ext2_inode_info *); 137 138/* ioctl.c */ 139extern int ext2_ioctl (struct inode *, struct file *, unsigned int, 140 unsigned long); 141extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long); 142 143/* namei.c */ 144struct dentry *ext2_get_parent(struct dentry *child); 145 146/* super.c */ 147extern void ext2_error (struct super_block *, const char *, const char *, ...) 148 __attribute__ ((format (printf, 3, 4))); 149extern void ext2_warning (struct super_block *, const char *, const char *, ...) 150 __attribute__ ((format (printf, 3, 4))); 151extern void ext2_update_dynamic_rev (struct super_block *sb); 152extern void ext2_write_super (struct super_block *); 153 154/* 155 * Inodes and files operations 156 */ 157 158/* dir.c */ 159extern const struct file_operations ext2_dir_operations; 160 161/* file.c */ 162extern const struct inode_operations ext2_file_inode_operations; 163extern const struct file_operations ext2_file_operations; 164extern const struct file_operations ext2_xip_file_operations; 165 166/* inode.c */ 167extern const struct address_space_operations ext2_aops; 168extern const struct address_space_operations ext2_aops_xip; 169extern const struct address_space_operations ext2_nobh_aops; 170 171/* namei.c */ 172extern const struct inode_operations ext2_dir_inode_operations; 173extern const struct inode_operations ext2_special_inode_operations; 174 175/* symlink.c */ 176extern const struct inode_operations ext2_fast_symlink_inode_operations; 177extern const struct inode_operations ext2_symlink_inode_operations; 178