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gerrit-public.fairphone.software / kernel / msm-4.9 / f5e54d6e53a20cef45af7499e86164f0e0d16bb2 / . / fs / ext2 / ext2.h
blob: e65a019fc7a58b87f80c64fcaa7944b06bd30242 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1#include <linux/fs.h>
2#include <linux/ext2_fs.h>
3
4/*
Jan Kara50a52232005-07-12 13:58:29 -0700[diff] [blame]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/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]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
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800[diff] [blame]56 * data. Taking i_mutex even when reading would cause contention
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]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);
Bernard Blackhame072c6f2005-04-16 15:25:45 -0700[diff] [blame]128extern void ext2_put_inode (struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]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);
136
137/* ioctl.c */
138extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
139 unsigned long);
140
Adrian Bunk2c221292006-03-24 03:15:53 -0800[diff] [blame]141/* namei.c */
142struct dentry *ext2_get_parent(struct dentry *child);
143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]144/* super.c */
145extern void ext2_error (struct super_block *, const char *, const char *, ...)
146 __attribute__ ((format (printf, 3, 4)));
147extern void ext2_warning (struct super_block *, const char *, const char *, ...)
148 __attribute__ ((format (printf, 3, 4)));
149extern void ext2_update_dynamic_rev (struct super_block *sb);
150extern void ext2_write_super (struct super_block *);
151
152/*
153 * Inodes and files operations
154 */
155
156/* dir.c */
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800[diff] [blame]157extern const struct file_operations ext2_dir_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]158
159/* file.c */
160extern struct inode_operations ext2_file_inode_operations;
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800[diff] [blame]161extern const struct file_operations ext2_file_operations;
162extern const struct file_operations ext2_xip_file_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]163
164/* inode.c */
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700[diff] [blame^]165extern const struct address_space_operations ext2_aops;
166extern const struct address_space_operations ext2_aops_xip;
167extern const struct address_space_operations ext2_nobh_aops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]168
169/* namei.c */
170extern struct inode_operations ext2_dir_inode_operations;
171extern struct inode_operations ext2_special_inode_operations;
172
173/* symlink.c */
174extern struct inode_operations ext2_fast_symlink_inode_operations;
175extern struct inode_operations ext2_symlink_inode_operations;