1#ifndef _LINUX_NAMEI_H
2#define _LINUX_NAMEI_H
3
4#include <linux/kernel.h>
5#include <linux/path.h>
6#include <linux/fcntl.h>
7#include <linux/errno.h>
8
9enum { MAX_NESTED_LINKS = 8 };
10
11#define MAXSYMLINKS 40
12
13
14
15
16enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
17
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22
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24
25
26
27#define LOOKUP_FOLLOW 0x0001
28#define LOOKUP_DIRECTORY 0x0002
29#define LOOKUP_AUTOMOUNT 0x0004
30
31#define LOOKUP_PARENT 0x0010
32#define LOOKUP_REVAL 0x0020
33#define LOOKUP_RCU 0x0040
34#define LOOKUP_NO_REVAL 0x0080
35
36
37
38
39#define LOOKUP_OPEN 0x0100
40#define LOOKUP_CREATE 0x0200
41#define LOOKUP_EXCL 0x0400
42#define LOOKUP_RENAME_TARGET 0x0800
43
44#define LOOKUP_JUMPED 0x1000
45#define LOOKUP_ROOT 0x2000
46#define LOOKUP_EMPTY 0x4000
47
48extern int path_pts(struct path *path);
49
50extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty);
51
52static inline int user_path_at(int dfd, const char __user *name, unsigned flags,
53 struct path *path)
54{
55 return user_path_at_empty(dfd, name, flags, path, NULL);
56}
57
58static inline int user_path(const char __user *name, struct path *path)
59{
60 return user_path_at_empty(AT_FDCWD, name, LOOKUP_FOLLOW, path, NULL);
61}
62
63static inline int user_lpath(const char __user *name, struct path *path)
64{
65 return user_path_at_empty(AT_FDCWD, name, 0, path, NULL);
66}
67
68static inline int user_path_dir(const char __user *name, struct path *path)
69{
70 return user_path_at_empty(AT_FDCWD, name,
71 LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path, NULL);
72}
73
74extern int kern_path(const char *, unsigned, struct path *);
75
76extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int);
77extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int);
78extern void done_path_create(struct path *, struct dentry *);
79extern struct dentry *kern_path_locked(const char *, struct path *);
80extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int);
81
82extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
83extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int);
84
85extern int follow_down_one(struct path *);
86extern int follow_down(struct path *);
87extern int follow_up(struct path *);
88
89extern struct dentry *lock_rename(struct dentry *, struct dentry *);
90extern void unlock_rename(struct dentry *, struct dentry *);
91
92extern void nd_jump_link(struct path *path);
93
94static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
95{
96 ((char *) name)[min(len, maxlen)] = '\0';
97}
98
99
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107
108
109static inline bool
110retry_estale(const long error, const unsigned int flags)
111{
112 return error == -ESTALE && !(flags & LOOKUP_REVAL);
113}
114
115#endif
116