Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 used 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 rwlock_t i_meta_lock;
51
52 /*
53 * truncate_mutex is for serialising ext2_truncate() against
54 * ext2_getblock(). It also protects the internals of the inode's
55 * reservation data structures: ext2_reserve_window and
56 * ext2_reserve_window_node.
57 */
58 struct mutex truncate_mutex;
59 struct inode vfs_inode;
60 struct list_head i_orphan; /* unlinked but open inodes */
61};
62
63/*
64 * Inode dynamic state flags
65 */
66#define EXT2_STATE_NEW 0x00000001 /* inode is newly created */
67
68
69/*
70 * Function prototypes
71 */
72
73/*
74 * Ok, these declarations are also in <linux/kernel.h> but none of the
75 * ext2 source programs needs to include it so they are duplicated here.
76 */
77
78static inline struct ext2_inode_info *EXT2_I(struct inode *inode)
79{
80 return container_of(inode, struct ext2_inode_info, vfs_inode);
81}
82
83/* balloc.c */
84extern int ext2_bg_has_super(struct super_block *sb, int group);
85extern unsigned long ext2_bg_num_gdb(struct super_block *sb, int group);
86extern ext2_fsblk_t ext2_new_block(struct inode *, unsigned long, int *);
87extern ext2_fsblk_t ext2_new_blocks(struct inode *, unsigned long,
88 unsigned long *, int *);
89extern void ext2_free_blocks (struct inode *, unsigned long,
90 unsigned long);
91extern unsigned long ext2_count_free_blocks (struct super_block *);
92extern unsigned long ext2_count_dirs (struct super_block *);
93extern void ext2_check_blocks_bitmap (struct super_block *);
94extern struct ext2_group_desc * ext2_get_group_desc(struct super_block * sb,
95 unsigned int block_group,
96 struct buffer_head ** bh);
97extern void ext2_discard_reservation (struct inode *);
98extern int ext2_should_retry_alloc(struct super_block *sb, int *retries);
99extern void ext2_init_block_alloc_info(struct inode *);
100extern void ext2_rsv_window_add(struct super_block *sb, struct ext2_reserve_window_node *rsv);
101
102/* dir.c */
103extern int ext2_add_link (struct dentry *, struct inode *);
104extern ino_t ext2_inode_by_name(struct inode *, struct qstr *);
105extern int ext2_make_empty(struct inode *, struct inode *);
106extern struct ext2_dir_entry_2 * ext2_find_entry (struct inode *,struct qstr *, struct page **);
107extern int ext2_delete_entry (struct ext2_dir_entry_2 *, struct page *);
108extern int ext2_empty_dir (struct inode *);
109extern struct ext2_dir_entry_2 * ext2_dotdot (struct inode *, struct page **);
110extern void ext2_set_link(struct inode *, struct ext2_dir_entry_2 *, struct page *, struct inode *, int);
111
112/* ialloc.c */
113extern struct inode * ext2_new_inode (struct inode *, int, const struct qstr *);
114extern void ext2_free_inode (struct inode *);
115extern unsigned long ext2_count_free_inodes (struct super_block *);
116extern void ext2_check_inodes_bitmap (struct super_block *);
117extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
118
119/* inode.c */
120extern struct inode *ext2_iget (struct super_block *, unsigned long);
121extern int ext2_write_inode (struct inode *, struct writeback_control *);
122extern void ext2_evict_inode(struct inode *);
123extern int ext2_get_block(struct inode *, sector_t, struct buffer_head *, int);
124extern int ext2_setattr (struct dentry *, struct iattr *);
125extern void ext2_set_inode_flags(struct inode *inode);
126extern void ext2_get_inode_flags(struct ext2_inode_info *);
127extern int ext2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
128 u64 start, u64 len);
129
130/* ioctl.c */
131extern long ext2_ioctl(struct file *, unsigned int, unsigned long);
132extern long ext2_compat_ioctl(struct file *, unsigned int, unsigned long);
133
134/* namei.c */
135struct dentry *ext2_get_parent(struct dentry *child);
136
137/* super.c */
138extern void ext2_error (struct super_block *, const char *, const char *, ...)
139 __attribute__ ((format (printf, 3, 4)));
140extern void ext2_msg(struct super_block *, const char *, const char *, ...)
141 __attribute__ ((format (printf, 3, 4)));
142extern void ext2_update_dynamic_rev (struct super_block *sb);
143extern void ext2_write_super (struct super_block *);
144
145/*
146 * Inodes and files operations
147 */
148
149/* dir.c */
150extern const struct file_operations ext2_dir_operations;
151
152/* file.c */
153extern int ext2_fsync(struct file *file, int datasync);
154extern const struct inode_operations ext2_file_inode_operations;
155extern const struct file_operations ext2_file_operations;
156extern const struct file_operations ext2_xip_file_operations;
157
158/* inode.c */
159extern const struct address_space_operations ext2_aops;
160extern const struct address_space_operations ext2_aops_xip;
161extern const struct address_space_operations ext2_nobh_aops;
162
163/* namei.c */
164extern const struct inode_operations ext2_dir_inode_operations;
165extern const struct inode_operations ext2_special_inode_operations;
166
167/* symlink.c */
168extern const struct inode_operations ext2_fast_symlink_inode_operations;
169extern const struct inode_operations ext2_symlink_inode_operations;
170
171static inline ext2_fsblk_t
172ext2_group_first_block_no(struct super_block *sb, unsigned long group_no)
173{
174 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) +
175 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block);
176}
177
178#define ext2_set_bit __test_and_set_bit_le
179#define ext2_clear_bit __test_and_clear_bit_le
180#define ext2_test_bit test_bit_le
181#define ext2_find_first_zero_bit find_first_zero_bit_le
182#define ext2_find_next_zero_bit find_next_zero_bit_le