1
2#ifndef _LINUX_NAMEI_H
3#define _LINUX_NAMEI_H
4
5#include <linux/fs.h>
6#include <linux/kernel.h>
7#include <linux/path.h>
8#include <linux/fcntl.h>
9#include <linux/errno.h>
10
11enum { MAX_NESTED_LINKS = 8 };
12
13#define MAXSYMLINKS 40
14
15
16
17
18enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT};
19
20
21#define LOOKUP_FOLLOW 0x0001
22#define LOOKUP_DIRECTORY 0x0002
23#define LOOKUP_AUTOMOUNT 0x0004
24#define LOOKUP_EMPTY 0x4000
25#define LOOKUP_DOWN 0x8000
26#define LOOKUP_MOUNTPOINT 0x0080
27
28#define LOOKUP_REVAL 0x0020
29#define LOOKUP_RCU 0x0040
30
31
32#define LOOKUP_OPEN 0x0100
33#define LOOKUP_CREATE 0x0200
34#define LOOKUP_EXCL 0x0400
35#define LOOKUP_RENAME_TARGET 0x0800
36
37
38#define LOOKUP_PARENT 0x0010
39#define LOOKUP_JUMPED 0x1000
40#define LOOKUP_ROOT 0x2000
41#define LOOKUP_ROOT_GRABBED 0x0008
42
43
44#define LOOKUP_NO_SYMLINKS 0x010000
45#define LOOKUP_NO_MAGICLINKS 0x020000
46#define LOOKUP_NO_XDEV 0x040000
47#define LOOKUP_BENEATH 0x080000
48#define LOOKUP_IN_ROOT 0x100000
49
50#define LOOKUP_IS_SCOPED (LOOKUP_BENEATH | LOOKUP_IN_ROOT)
51
52extern int path_pts(struct path *path);
53
54extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty);
55
56static inline int user_path_at(int dfd, const char __user *name, unsigned flags,
57 struct path *path)
58{
59 return user_path_at_empty(dfd, name, flags, path, NULL);
60}
61
62extern int kern_path(const char *, unsigned, struct path *);
63
64extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int);
65extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int);
66extern void done_path_create(struct path *, struct dentry *);
67extern struct dentry *kern_path_locked(const char *, struct path *);
68
69extern struct dentry *try_lookup_one_len(const char *, struct dentry *, int);
70extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
71extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int);
72extern struct dentry *lookup_positive_unlocked(const char *, struct dentry *, int);
73
74extern int follow_down_one(struct path *);
75extern int follow_down(struct path *);
76extern int follow_up(struct path *);
77
78extern struct dentry *lock_rename(struct dentry *, struct dentry *);
79extern void unlock_rename(struct dentry *, struct dentry *);
80
81extern int __must_check nd_jump_link(struct path *path);
82
83static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
84{
85 ((char *) name)[min(len, maxlen)] = '\0';
86}
87
88
89
90
91
92
93
94
95
96
97
98static inline bool
99retry_estale(const long error, const unsigned int flags)
100{
101 return error == -ESTALE && !(flags & LOOKUP_REVAL);
102}
103
104#endif
105