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