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 | ||
6b61aed0 AV |
19 | /* pathwalk mode */ |
20 | #define LOOKUP_FOLLOW 0x0001 /* follow links at the end */ | |
21 | #define LOOKUP_DIRECTORY 0x0002 /* require a directory */ | |
22 | #define LOOKUP_AUTOMOUNT 0x0004 /* force terminal automount */ | |
23 | #define LOOKUP_EMPTY 0x4000 /* accept empty path [user_... only] */ | |
24 | #define LOOKUP_DOWN 0x8000 /* follow mounts in the starting point */ | |
25 | ||
26 | #define LOOKUP_REVAL 0x0020 /* tell ->d_revalidate() to trust no cache */ | |
27 | #define LOOKUP_RCU 0x0040 /* RCU pathwalk mode; semi-internal */ | |
28 | ||
29 | /* These tell filesystem methods that we are dealing with the final component... */ | |
30 | #define LOOKUP_OPEN 0x0100 /* ... in open */ | |
31 | #define LOOKUP_CREATE 0x0200 /* ... in object creation */ | |
32 | #define LOOKUP_EXCL 0x0400 /* ... in exclusive creation */ | |
33 | #define LOOKUP_RENAME_TARGET 0x0800 /* ... in destination of rename() */ | |
34 | ||
35 | /* internal use only */ | |
31e6b01f | 36 | #define LOOKUP_PARENT 0x0010 |
949a852e | 37 | #define LOOKUP_NO_REVAL 0x0080 |
16c2cd71 | 38 | #define LOOKUP_JUMPED 0x1000 |
5b6ca027 | 39 | #define LOOKUP_ROOT 0x2000 |
84a2bd39 | 40 | #define LOOKUP_ROOT_GRABBED 0x0008 |
16c2cd71 | 41 | |
27812141 AS |
42 | /* Scoping flags for lookup. */ |
43 | #define LOOKUP_NO_SYMLINKS 0x010000 /* No symlink crossing. */ | |
44 | ||
eedf265a EB |
45 | extern int path_pts(struct path *path); |
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 | ||
d1811465 AV |
55 | extern int kern_path(const char *, unsigned, struct path *); |
56 | ||
1ac12b4b JL |
57 | extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int); |
58 | extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int); | |
921a1650 | 59 | extern void done_path_create(struct path *, struct dentry *); |
79714f72 | 60 | extern struct dentry *kern_path_locked(const char *, struct path *); |
2d864651 | 61 | extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int); |
1da177e4 | 62 | |
0da0b7fd | 63 | extern struct dentry *try_lookup_one_len(const char *, struct dentry *, int); |
eead1911 | 64 | extern struct dentry *lookup_one_len(const char *, struct dentry *, int); |
bbddca8e | 65 | extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int); |
6c2d4798 | 66 | extern struct dentry *lookup_positive_unlocked(const char *, struct dentry *, int); |
1da177e4 | 67 | |
cc53ce53 | 68 | extern int follow_down_one(struct path *); |
7cc90cc3 | 69 | extern int follow_down(struct path *); |
bab77ebf | 70 | extern int follow_up(struct path *); |
1da177e4 LT |
71 | |
72 | extern struct dentry *lock_rename(struct dentry *, struct dentry *); | |
73 | extern void unlock_rename(struct dentry *, struct dentry *); | |
74 | ||
1bc82070 | 75 | extern int __must_check nd_jump_link(struct path *path); |
1da177e4 | 76 | |
03514685 DG |
77 | static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) |
78 | { | |
79 | ((char *) name)[min(len, maxlen)] = '\0'; | |
80 | } | |
81 | ||
b9d6ba94 JL |
82 | /** |
83 | * retry_estale - determine whether the caller should retry an operation | |
84 | * @error: the error that would currently be returned | |
85 | * @flags: flags being used for next lookup attempt | |
86 | * | |
87 | * Check to see if the error code was -ESTALE, and then determine whether | |
88 | * to retry the call based on whether "flags" already has LOOKUP_REVAL set. | |
89 | * | |
90 | * Returns true if the caller should try the operation again. | |
91 | */ | |
92 | static inline bool | |
93 | retry_estale(const long error, const unsigned int flags) | |
94 | { | |
95 | return error == -ESTALE && !(flags & LOOKUP_REVAL); | |
96 | } | |
97 | ||
1da177e4 | 98 | #endif /* _LINUX_NAMEI_H */ |