Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_NAMEI_H |
2 | #define _LINUX_NAMEI_H | |
3 | ||
b853a161 | 4 | #include <linux/kernel.h> |
c5e725f3 | 5 | #include <linux/path.h> |
b853a161 AV |
6 | #include <linux/fcntl.h> |
7 | #include <linux/errno.h> | |
1da177e4 | 8 | |
737bebd1 | 9 | enum { MAX_NESTED_LINKS = 8 }; |
1da177e4 | 10 | |
894bc8c4 AV |
11 | #define MAXSYMLINKS 40 |
12 | ||
1da177e4 LT |
13 | /* |
14 | * Type of the last component on LOOKUP_PARENT | |
15 | */ | |
16 | enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; | |
17 | ||
18 | /* | |
19 | * The bitmask for a lookup event: | |
20 | * - follow links at the end | |
21 | * - require a directory | |
22 | * - ending slashes ok even for nonexistent files | |
47a0dfaa | 23 | * - internal "there are more path components" flag |
1da177e4 | 24 | * - dentry cache is untrusted; force a real lookup |
6f45b656 | 25 | * - suppress terminal automount |
1da177e4 | 26 | */ |
31e6b01f NP |
27 | #define LOOKUP_FOLLOW 0x0001 |
28 | #define LOOKUP_DIRECTORY 0x0002 | |
d94c177b | 29 | #define LOOKUP_AUTOMOUNT 0x0004 |
31e6b01f NP |
30 | |
31 | #define LOOKUP_PARENT 0x0010 | |
32 | #define LOOKUP_REVAL 0x0020 | |
33 | #define LOOKUP_RCU 0x0040 | |
b6c8069d | 34 | |
1da177e4 LT |
35 | /* |
36 | * Intent data | |
37 | */ | |
3516586a AV |
38 | #define LOOKUP_OPEN 0x0100 |
39 | #define LOOKUP_CREATE 0x0200 | |
40 | #define LOOKUP_EXCL 0x0400 | |
4e9ed2f8 | 41 | #define LOOKUP_RENAME_TARGET 0x0800 |
1da177e4 | 42 | |
16c2cd71 | 43 | #define LOOKUP_JUMPED 0x1000 |
5b6ca027 | 44 | #define LOOKUP_ROOT 0x2000 |
f52e0c11 | 45 | #define LOOKUP_EMPTY 0x4000 |
16c2cd71 | 46 | |
1fa1e7f6 | 47 | extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty); |
2d8f3038 | 48 | |
b853a161 AV |
49 | static inline int user_path_at(int dfd, const char __user *name, unsigned flags, |
50 | struct path *path) | |
51 | { | |
52 | return user_path_at_empty(dfd, name, flags, path, NULL); | |
53 | } | |
54 | ||
55 | static inline int user_path(const char __user *name, struct path *path) | |
56 | { | |
57 | return user_path_at_empty(AT_FDCWD, name, LOOKUP_FOLLOW, path, NULL); | |
58 | } | |
59 | ||
60 | static inline int user_lpath(const char __user *name, struct path *path) | |
61 | { | |
62 | return user_path_at_empty(AT_FDCWD, name, 0, path, NULL); | |
63 | } | |
64 | ||
65 | static inline int user_path_dir(const char __user *name, struct path *path) | |
66 | { | |
67 | return user_path_at_empty(AT_FDCWD, name, | |
68 | LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path, NULL); | |
69 | } | |
2d8f3038 | 70 | |
d1811465 AV |
71 | extern int kern_path(const char *, unsigned, struct path *); |
72 | ||
1ac12b4b JL |
73 | extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int); |
74 | extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int); | |
921a1650 | 75 | extern void done_path_create(struct path *, struct dentry *); |
79714f72 | 76 | extern struct dentry *kern_path_locked(const char *, struct path *); |
2d864651 | 77 | extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int); |
1da177e4 | 78 | |
eead1911 | 79 | extern struct dentry *lookup_one_len(const char *, struct dentry *, int); |
bbddca8e | 80 | extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int); |
1da177e4 | 81 | |
cc53ce53 | 82 | extern int follow_down_one(struct path *); |
7cc90cc3 | 83 | extern int follow_down(struct path *); |
bab77ebf | 84 | extern int follow_up(struct path *); |
1da177e4 LT |
85 | |
86 | extern struct dentry *lock_rename(struct dentry *, struct dentry *); | |
87 | extern void unlock_rename(struct dentry *, struct dentry *); | |
88 | ||
6e77137b | 89 | extern void nd_jump_link(struct path *path); |
1da177e4 | 90 | |
03514685 DG |
91 | static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) |
92 | { | |
93 | ((char *) name)[min(len, maxlen)] = '\0'; | |
94 | } | |
95 | ||
b9d6ba94 JL |
96 | /** |
97 | * retry_estale - determine whether the caller should retry an operation | |
98 | * @error: the error that would currently be returned | |
99 | * @flags: flags being used for next lookup attempt | |
100 | * | |
101 | * Check to see if the error code was -ESTALE, and then determine whether | |
102 | * to retry the call based on whether "flags" already has LOOKUP_REVAL set. | |
103 | * | |
104 | * Returns true if the caller should try the operation again. | |
105 | */ | |
106 | static inline bool | |
107 | retry_estale(const long error, const unsigned int flags) | |
108 | { | |
109 | return error == -ESTALE && !(flags & LOOKUP_REVAL); | |
110 | } | |
111 | ||
1da177e4 | 112 | #endif /* _LINUX_NAMEI_H */ |