Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_NAMEI_H |
3 | #define _LINUX_NAMEI_H | |
4 | ||
b853a161 | 5 | #include <linux/kernel.h> |
c5e725f3 | 6 | #include <linux/path.h> |
b853a161 AV |
7 | #include <linux/fcntl.h> |
8 | #include <linux/errno.h> | |
1da177e4 | 9 | |
737bebd1 | 10 | enum { MAX_NESTED_LINKS = 8 }; |
1da177e4 | 11 | |
894bc8c4 AV |
12 | #define MAXSYMLINKS 40 |
13 | ||
1da177e4 LT |
14 | /* |
15 | * Type of the last component on LOOKUP_PARENT | |
16 | */ | |
17 | enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; | |
18 | ||
19 | /* | |
20 | * The bitmask for a lookup event: | |
21 | * - follow links at the end | |
22 | * - require a directory | |
23 | * - ending slashes ok even for nonexistent files | |
47a0dfaa | 24 | * - internal "there are more path components" flag |
1da177e4 | 25 | * - dentry cache is untrusted; force a real lookup |
6f45b656 | 26 | * - suppress terminal automount |
57d46577 | 27 | * - skip revalidation |
1da177e4 | 28 | */ |
31e6b01f NP |
29 | #define LOOKUP_FOLLOW 0x0001 |
30 | #define LOOKUP_DIRECTORY 0x0002 | |
d94c177b | 31 | #define LOOKUP_AUTOMOUNT 0x0004 |
31e6b01f NP |
32 | |
33 | #define LOOKUP_PARENT 0x0010 | |
34 | #define LOOKUP_REVAL 0x0020 | |
35 | #define LOOKUP_RCU 0x0040 | |
949a852e | 36 | #define LOOKUP_NO_REVAL 0x0080 |
b6c8069d | 37 | |
1da177e4 LT |
38 | /* |
39 | * Intent data | |
40 | */ | |
3516586a AV |
41 | #define LOOKUP_OPEN 0x0100 |
42 | #define LOOKUP_CREATE 0x0200 | |
43 | #define LOOKUP_EXCL 0x0400 | |
4e9ed2f8 | 44 | #define LOOKUP_RENAME_TARGET 0x0800 |
1da177e4 | 45 | |
16c2cd71 | 46 | #define LOOKUP_JUMPED 0x1000 |
5b6ca027 | 47 | #define LOOKUP_ROOT 0x2000 |
f52e0c11 | 48 | #define LOOKUP_EMPTY 0x4000 |
4f757f3c | 49 | #define LOOKUP_DOWN 0x8000 |
16c2cd71 | 50 | |
eedf265a EB |
51 | extern int path_pts(struct path *path); |
52 | ||
1fa1e7f6 | 53 | extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty); |
2d8f3038 | 54 | |
b853a161 AV |
55 | static inline int user_path_at(int dfd, const char __user *name, unsigned flags, |
56 | struct path *path) | |
57 | { | |
58 | return user_path_at_empty(dfd, name, flags, path, NULL); | |
59 | } | |
60 | ||
61 | static inline int user_path(const char __user *name, struct path *path) | |
62 | { | |
63 | return user_path_at_empty(AT_FDCWD, name, LOOKUP_FOLLOW, path, NULL); | |
64 | } | |
65 | ||
66 | static inline int user_lpath(const char __user *name, struct path *path) | |
67 | { | |
68 | return user_path_at_empty(AT_FDCWD, name, 0, path, NULL); | |
69 | } | |
70 | ||
71 | static inline int user_path_dir(const char __user *name, struct path *path) | |
72 | { | |
73 | return user_path_at_empty(AT_FDCWD, name, | |
74 | LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path, NULL); | |
75 | } | |
2d8f3038 | 76 | |
d1811465 AV |
77 | extern int kern_path(const char *, unsigned, struct path *); |
78 | ||
1ac12b4b JL |
79 | extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int); |
80 | extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int); | |
921a1650 | 81 | extern void done_path_create(struct path *, struct dentry *); |
79714f72 | 82 | extern struct dentry *kern_path_locked(const char *, struct path *); |
2d864651 | 83 | extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int); |
1da177e4 | 84 | |
0da0b7fd | 85 | extern struct dentry *try_lookup_one_len(const char *, struct dentry *, int); |
eead1911 | 86 | extern struct dentry *lookup_one_len(const char *, struct dentry *, int); |
bbddca8e | 87 | extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int); |
1da177e4 | 88 | |
cc53ce53 | 89 | extern int follow_down_one(struct path *); |
7cc90cc3 | 90 | extern int follow_down(struct path *); |
bab77ebf | 91 | extern int follow_up(struct path *); |
1da177e4 LT |
92 | |
93 | extern struct dentry *lock_rename(struct dentry *, struct dentry *); | |
94 | extern void unlock_rename(struct dentry *, struct dentry *); | |
95 | ||
6e77137b | 96 | extern void nd_jump_link(struct path *path); |
1da177e4 | 97 | |
03514685 DG |
98 | static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) |
99 | { | |
100 | ((char *) name)[min(len, maxlen)] = '\0'; | |
101 | } | |
102 | ||
b9d6ba94 JL |
103 | /** |
104 | * retry_estale - determine whether the caller should retry an operation | |
105 | * @error: the error that would currently be returned | |
106 | * @flags: flags being used for next lookup attempt | |
107 | * | |
108 | * Check to see if the error code was -ESTALE, and then determine whether | |
109 | * to retry the call based on whether "flags" already has LOOKUP_REVAL set. | |
110 | * | |
111 | * Returns true if the caller should try the operation again. | |
112 | */ | |
113 | static inline bool | |
114 | retry_estale(const long error, const unsigned int flags) | |
115 | { | |
116 | return error == -ESTALE && !(flags & LOOKUP_REVAL); | |
117 | } | |
118 | ||
1da177e4 | 119 | #endif /* _LINUX_NAMEI_H */ |