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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 | ||
adb21d2b | 5 | #include <linux/fs.h> |
b853a161 | 6 | #include <linux/kernel.h> |
c5e725f3 | 7 | #include <linux/path.h> |
b853a161 AV |
8 | #include <linux/fcntl.h> |
9 | #include <linux/errno.h> | |
1da177e4 | 10 | |
737bebd1 | 11 | enum { MAX_NESTED_LINKS = 8 }; |
1da177e4 | 12 | |
894bc8c4 AV |
13 | #define MAXSYMLINKS 40 |
14 | ||
1da177e4 LT |
15 | /* |
16 | * Type of the last component on LOOKUP_PARENT | |
17 | */ | |
b4c03536 | 18 | enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT}; |
1da177e4 | 19 | |
6b61aed0 AV |
20 | /* pathwalk mode */ |
21 | #define LOOKUP_FOLLOW 0x0001 /* follow links at the end */ | |
22 | #define LOOKUP_DIRECTORY 0x0002 /* require a directory */ | |
23 | #define LOOKUP_AUTOMOUNT 0x0004 /* force terminal automount */ | |
24 | #define LOOKUP_EMPTY 0x4000 /* accept empty path [user_... only] */ | |
25 | #define LOOKUP_DOWN 0x8000 /* follow mounts in the starting point */ | |
161aff1d | 26 | #define LOOKUP_MOUNTPOINT 0x0080 /* follow mounts in the end */ |
6b61aed0 AV |
27 | |
28 | #define LOOKUP_REVAL 0x0020 /* tell ->d_revalidate() to trust no cache */ | |
29 | #define LOOKUP_RCU 0x0040 /* RCU pathwalk mode; semi-internal */ | |
30 | ||
31 | /* These tell filesystem methods that we are dealing with the final component... */ | |
32 | #define LOOKUP_OPEN 0x0100 /* ... in open */ | |
33 | #define LOOKUP_CREATE 0x0200 /* ... in object creation */ | |
34 | #define LOOKUP_EXCL 0x0400 /* ... in exclusive creation */ | |
35 | #define LOOKUP_RENAME_TARGET 0x0800 /* ... in destination of rename() */ | |
36 | ||
37 | /* internal use only */ | |
31e6b01f | 38 | #define LOOKUP_PARENT 0x0010 |
16c2cd71 | 39 | |
27812141 AS |
40 | /* Scoping flags for lookup. */ |
41 | #define LOOKUP_NO_SYMLINKS 0x010000 /* No symlink crossing. */ | |
4b99d499 | 42 | #define LOOKUP_NO_MAGICLINKS 0x020000 /* No nd_jump_link() crossing. */ |
72ba2929 | 43 | #define LOOKUP_NO_XDEV 0x040000 /* No mountpoint crossing. */ |
adb21d2b | 44 | #define LOOKUP_BENEATH 0x080000 /* No escaping from starting point. */ |
8db52c7e | 45 | #define LOOKUP_IN_ROOT 0x100000 /* Treat dirfd as fs root. */ |
6c6ec2b0 | 46 | #define LOOKUP_CACHED 0x200000 /* Only do cached lookup */ |
adb21d2b | 47 | /* LOOKUP_* flags which do scope-related checks based on the dirfd. */ |
8db52c7e | 48 | #define LOOKUP_IS_SCOPED (LOOKUP_BENEATH | LOOKUP_IN_ROOT) |
27812141 | 49 | |
eedf265a EB |
50 | extern int path_pts(struct path *path); |
51 | ||
1fa1e7f6 | 52 | extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty); |
2d8f3038 | 53 | |
b853a161 AV |
54 | static inline int user_path_at(int dfd, const char __user *name, unsigned flags, |
55 | struct path *path) | |
56 | { | |
57 | return user_path_at_empty(dfd, name, flags, path, NULL); | |
58 | } | |
59 | ||
d1811465 AV |
60 | extern int kern_path(const char *, unsigned, struct path *); |
61 | ||
1ac12b4b JL |
62 | extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int); |
63 | extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int); | |
921a1650 | 64 | extern void done_path_create(struct path *, struct dentry *); |
79714f72 | 65 | extern struct dentry *kern_path_locked(const char *, struct path *); |
1da177e4 | 66 | |
0da0b7fd | 67 | extern struct dentry *try_lookup_one_len(const char *, struct dentry *, int); |
eead1911 | 68 | extern struct dentry *lookup_one_len(const char *, struct dentry *, int); |
bbddca8e | 69 | extern struct dentry *lookup_one_len_unlocked(const char *, struct dentry *, int); |
6c2d4798 | 70 | extern struct dentry *lookup_positive_unlocked(const char *, struct dentry *, int); |
c2fd68b6 | 71 | struct dentry *lookup_one(struct user_namespace *, const char *, struct dentry *, int); |
1da177e4 | 72 | |
cc53ce53 | 73 | extern int follow_down_one(struct path *); |
7cc90cc3 | 74 | extern int follow_down(struct path *); |
bab77ebf | 75 | extern int follow_up(struct path *); |
1da177e4 LT |
76 | |
77 | extern struct dentry *lock_rename(struct dentry *, struct dentry *); | |
78 | extern void unlock_rename(struct dentry *, struct dentry *); | |
79 | ||
1bc82070 | 80 | extern int __must_check nd_jump_link(struct path *path); |
1da177e4 | 81 | |
03514685 DG |
82 | static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) |
83 | { | |
84 | ((char *) name)[min(len, maxlen)] = '\0'; | |
85 | } | |
86 | ||
b9d6ba94 JL |
87 | /** |
88 | * retry_estale - determine whether the caller should retry an operation | |
89 | * @error: the error that would currently be returned | |
90 | * @flags: flags being used for next lookup attempt | |
91 | * | |
92 | * Check to see if the error code was -ESTALE, and then determine whether | |
93 | * to retry the call based on whether "flags" already has LOOKUP_REVAL set. | |
94 | * | |
95 | * Returns true if the caller should try the operation again. | |
96 | */ | |
97 | static inline bool | |
98 | retry_estale(const long error, const unsigned int flags) | |
99 | { | |
100 | return error == -ESTALE && !(flags & LOOKUP_REVAL); | |
101 | } | |
102 | ||
1da177e4 | 103 | #endif /* _LINUX_NAMEI_H */ |