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ocfs2: fiemap support
[net-next-2.6.git] / fs / ext2 / ext2.h
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1da177e4
LT		 1#include <linux/fs.h>
2#include <linux/ext2_fs.h>
3
50a52234
JK		 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
1da177e4
LT		 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
a686cd89
MB		 36 /* block reservation info */
37 struct ext2_block_alloc_info *i_block_alloc_info;
1da177e4 38
1da177e4
LT		 39 __u32 i_dir_start_lookup;
40#ifdef CONFIG_EXT2_FS_XATTR
41 /*
42 * Extended attributes can be read independently of the main file
1b1dcc1b 43 * data. Taking i_mutex even when reading would cause contention
1da177e4
LT		 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;
a686cd89
MB		 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;
1da177e4 63 struct inode vfs_inode;
a686cd89 64 struct list_head i_orphan; /* unlinked but open inodes */
1da177e4
LT		 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
82static 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 */
88extern int ext2_bg_has_super(struct super_block *sb, int group);
89extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
a686cd89
MB		 90extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *);
91extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,
92 unsigned long *, int *);
1da177e4
LT		 93extern void ext2_free_blocks (struct inode *, unsigned long,
94 unsigned long);
95extern unsigned long ext2_count_free_blocks (struct super_block *);
96extern unsigned long ext2_count_dirs (struct super_block *);
97extern void ext2_check_blocks_bitmap (struct super_block *);
98extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
99 unsigned int block_group,
100 struct buffer_head ** bh);
a686cd89
MB		 101extern void ext2_discard_reservation (struct inode *);
102extern int ext2_should_retry_alloc(struct super_block *sb, int *retries);
103extern void ext2_init_block_alloc_info(struct inode *);
104extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
1da177e4
LT		 105
106/* dir.c */
107extern int ext2_add_link (struct dentry *, struct inode *);
108extern ino_t ext2_inode_by_name(struct inode *, struct dentry *);
109extern int ext2_make_empty(struct inode *, struct inode *);
110extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct dentry *, struct page **);
111extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);
112extern int ext2_empty_dir (struct inode *);
113extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **);
114extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *);
115
116/* fsync.c */
117extern int ext2_sync_file (struct file *, struct dentry *, int);
118
119/* ialloc.c */
120extern struct inode * ext2_new_inode (struct inode *, int);
121extern void ext2_free_inode (struct inode *);
122extern unsigned long ext2_count_free_inodes (struct super_block *);
123extern void ext2_check_inodes_bitmap (struct super_block *);
124extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
125
126/* inode.c */
52fcf703 127extern struct inode *ext2_iget (struct super_block *, unsigned long);
1da177e4
LT		 128extern int ext2_write_inode (struct inode *, int);
129extern void ext2_delete_inode (struct inode *);
130extern int ext2_sync_inode (struct inode *);
1da177e4
LT		 131extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
132extern void ext2_truncate (struct inode *);
133extern int ext2_setattr (struct dentry *, struct iattr *);
134extern void ext2_set_inode_flags(struct inode *inode);
4f99ed67 135extern void ext2_get_inode_flags(struct ext2_inode_info *);
f34fb6ec
NP		 136int __ext2_write_begin(struct file *file, struct address_space *mapping,
137 loff_t pos, unsigned len, unsigned flags,
138 struct page **pagep, void **fsdata);
1da177e4
LT		 139
140/* ioctl.c */
14f9f7b2 141extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
e322ff07 142extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
1da177e4 143
2c221290
AB		 144/* namei.c */
145struct dentry *ext2_get_parent(struct dentry *child);
146
1da177e4
LT		 147/* super.c */
148extern void ext2_error (struct super_block *, const char *, const char *, ...)
149 __attribute__ ((format (printf, 3, 4)));
150extern void ext2_warning (struct super_block *, const char *, const char *, ...)
151 __attribute__ ((format (printf, 3, 4)));
152extern void ext2_update_dynamic_rev (struct super_block *sb);
153extern void ext2_write_super (struct super_block *);
154
155/*
156 * Inodes and files operations
157 */
158
159/* dir.c */
4b6f5d20 160extern const struct file_operations ext2_dir_operations;
1da177e4
LT		 161
162/* file.c */
754661f1 163extern const struct inode_operations ext2_file_inode_operations;
4b6f5d20
AV		 164extern const struct file_operations ext2_file_operations;
165extern const struct file_operations ext2_xip_file_operations;
1da177e4
LT		 166
167/* inode.c */
f5e54d6e
CH		 168extern const struct address_space_operations ext2_aops;
169extern const struct address_space_operations ext2_aops_xip;
170extern const struct address_space_operations ext2_nobh_aops;
1da177e4
LT		 171
172/* namei.c */
754661f1
AV		 173extern const struct inode_operations ext2_dir_inode_operations;
174extern const struct inode_operations ext2_special_inode_operations;
1da177e4
LT		 175
176/* symlink.c */
754661f1
AV		 177extern const struct inode_operations ext2_fast_symlink_inode_operations;
178extern const struct inode_operations ext2_symlink_inode_operations;
6454d1f9
TP		 179
180static inline ext2_fsblk_t
181ext2_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}
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