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 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
86 static 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 */
92 extern int ext2_bg_has_super(struct super_block *sb, int group);
93 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
94 extern int ext2_new_block (struct inode *, unsigned long,
95 __u32 *, __u32 *, int *);
96 extern void ext2_free_blocks (struct inode *, unsigned long,
97 unsigned long);
98 extern unsigned long ext2_count_free_blocks (struct super_block *);
99 extern unsigned long ext2_count_dirs (struct super_block *);
100 extern void ext2_check_blocks_bitmap (struct super_block *);
101 extern 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 */
106 extern int ext2_add_link (struct dentry *, struct inode *);
107 extern ino_t ext2_inode_by_name(struct inode *, struct dentry *);
108 extern int ext2_make_empty(struct inode *, struct inode *);
109 extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct dentry *, struct page **);
110 extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);
111 extern int ext2_empty_dir (struct inode *);
112 extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **);
113 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *);
114
115 /* fsync.c */
116 extern int ext2_sync_file (struct file *, struct dentry *, int);
117
118 /* ialloc.c */
119 extern struct inode * ext2_new_inode (struct inode *, int);
120 extern void ext2_free_inode (struct inode *);
121 extern unsigned long ext2_count_free_inodes (struct super_block *);
122 extern void ext2_check_inodes_bitmap (struct super_block *);
123 extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
124
125 /* inode.c */
126 extern void ext2_read_inode (struct inode *);
127 extern int ext2_write_inode (struct inode *, int);
128 extern void ext2_put_inode (struct inode *);
129 extern void ext2_delete_inode (struct inode *);
130 extern int ext2_sync_inode (struct inode *);
131 extern void ext2_discard_prealloc (struct inode *);
132 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
133 extern void ext2_truncate (struct inode *);
134 extern int ext2_setattr (struct dentry *, struct iattr *);
135 extern void ext2_set_inode_flags(struct inode *inode);
136
137 /* ioctl.c */
138 extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
139 unsigned long);
140
141 /* namei.c */
142 struct dentry *ext2_get_parent(struct dentry *child);
143
144 /* super.c */
145 extern void ext2_error (struct super_block *, const char *, const char *, ...)
146 __attribute__ ((format (printf, 3, 4)));
147 extern void ext2_warning (struct super_block *, const char *, const char *, ...)
148 __attribute__ ((format (printf, 3, 4)));
149 extern void ext2_update_dynamic_rev (struct super_block *sb);
150 extern void ext2_write_super (struct super_block *);
151
152 /*
153 * Inodes and files operations
154 */
155
156 /* dir.c */
157 extern const struct file_operations ext2_dir_operations;
158
159 /* file.c */
160 extern struct inode_operations ext2_file_inode_operations;
161 extern const struct file_operations ext2_file_operations;
162 extern const struct file_operations ext2_xip_file_operations;
163
164 /* inode.c */
165 extern struct address_space_operations ext2_aops;
166 extern struct address_space_operations ext2_aops_xip;
167 extern struct address_space_operations ext2_nobh_aops;
168
169 /* namei.c */
170 extern struct inode_operations ext2_dir_inode_operations;
171 extern struct inode_operations ext2_special_inode_operations;
172
173 /* symlink.c */
174 extern struct inode_operations ext2_fast_symlink_inode_operations;
175 extern struct inode_operations ext2_symlink_inode_operations;
176
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