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 /* 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 #ifdef CONFIG_EXT2_FS_POSIX_ACL
51 struct posix_acl *i_acl;
52 struct posix_acl *i_default_acl;
53 #endif
54 rwlock_t i_meta_lock;
55
56 /*
57 * truncate_mutex is for serialising ext2_truncate() against
58 * ext2_getblock(). It also protects the internals of the inode's
59 * reservation data structures: ext2_reserve_window and
60 * ext2_reserve_window_node.
61 */
62 struct mutex truncate_mutex;
63 struct inode vfs_inode;
64 struct list_head i_orphan; /* unlinked but open inodes */
65 };
66
67 /*
68 * Inode dynamic state flags
69 */
70 #define EXT2_STATE_NEW 0x00000001 /* inode is newly created */
71
72
73 /*
74 * Function prototypes
75 */
76
77 /*
78 * Ok, these declarations are also in <linux/kernel.h> but none of the
79 * ext2 source programs needs to include it so they are duplicated here.
80 */
81
82 static inline struct ext2_inode_info *EXT2_I(struct inode *inode)
83 {
84 return container_of(inode, struct ext2_inode_info, vfs_inode);
85 }
86
87 /* balloc.c */
88 extern int ext2_bg_has_super(struct super_block *sb, int group);
89 extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
90 extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *);
91 extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,
92 unsigned long *, int *);
93 extern void ext2_free_blocks (struct inode *, unsigned long,
94 unsigned long);
95 extern unsigned long ext2_count_free_blocks (struct super_block *);
96 extern unsigned long ext2_count_dirs (struct super_block *);
97 extern void ext2_check_blocks_bitmap (struct super_block *);
98 extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
99 unsigned int block_group,
100 struct buffer_head ** bh);
101 extern void ext2_discard_reservation (struct inode *);
102 extern int ext2_should_retry_alloc(struct super_block *sb, int *retries);
103 extern void ext2_init_block_alloc_info(struct inode *);
104 extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
105
106 /* dir.c */
107 extern int ext2_add_link (struct dentry *, struct inode *);
108 extern ino_t ext2_inode_by_name(struct inode *, struct dentry *);
109 extern int ext2_make_empty(struct inode *, struct inode *);
110 extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct dentry *, struct page **);
111 extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);
112 extern int ext2_empty_dir (struct inode *);
113 extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **);
114 extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *);
115
116 /* fsync.c */
117 extern int ext2_sync_file (struct file *, struct dentry *, int);
118
119 /* ialloc.c */
120 extern struct inode * ext2_new_inode (struct inode *, int);
121 extern void ext2_free_inode (struct inode *);
122 extern unsigned long ext2_count_free_inodes (struct super_block *);
123 extern void ext2_check_inodes_bitmap (struct super_block *);
124 extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
125
126 /* inode.c */
127 extern struct inode *ext2_iget (struct super_block *, unsigned long);
128 extern int ext2_write_inode (struct inode *, int);
129 extern void ext2_delete_inode (struct inode *);
130 extern int ext2_sync_inode (struct inode *);
131 extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
132 extern void ext2_truncate (struct inode *);
133 extern int ext2_setattr (struct dentry *, struct iattr *);
134 extern void ext2_set_inode_flags(struct inode *inode);
135 extern void ext2_get_inode_flags(struct ext2_inode_info *);
136 int __ext2_write_begin(struct file *file, struct address_space *mapping,
137 loff_t pos, unsigned len, unsigned flags,
138 struct page **pagep, void **fsdata);
139
140 /* ioctl.c */
141 extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
142 extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
143
144 /* namei.c */
145 struct dentry *ext2_get_parent(struct dentry *child);
146
147 /* super.c */
148 extern void ext2_error (struct super_block *, const char *, const char *, ...)
149 __attribute__ ((format (printf, 3, 4)));
150 extern void ext2_warning (struct super_block *, const char *, const char *, ...)
151 __attribute__ ((format (printf, 3, 4)));
152 extern void ext2_update_dynamic_rev (struct super_block *sb);
153 extern void ext2_write_super (struct super_block *);
154
155 /*
156 * Inodes and files operations
157 */
158
159 /* dir.c */
160 extern const struct file_operations ext2_dir_operations;
161
162 /* file.c */
163 extern const struct inode_operations ext2_file_inode_operations;
164 extern const struct file_operations ext2_file_operations;
165 extern const struct file_operations ext2_xip_file_operations;
166
167 /* inode.c */
168 extern const struct address_space_operations ext2_aops;
169 extern const struct address_space_operations ext2_aops_xip;
170 extern const struct address_space_operations ext2_nobh_aops;
171
172 /* namei.c */
173 extern const struct inode_operations ext2_dir_inode_operations;
174 extern const struct inode_operations ext2_special_inode_operations;
175
176 /* symlink.c */
177 extern const struct inode_operations ext2_fast_symlink_inode_operations;
178 extern const struct inode_operations ext2_symlink_inode_operations;
179
180 static inline ext2_fsblk_t
181 ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
182 {
183 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) +
184 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
185 }
186
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