]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef _LINUX_NAMEI_H |
2 | #define _LINUX_NAMEI_H | |
3 | ||
82b0547c | 4 | #include <linux/dcache.h> |
08b60f84 | 5 | #include <linux/errno.h> |
1da177e4 | 6 | #include <linux/linkage.h> |
c5e725f3 | 7 | #include <linux/path.h> |
1da177e4 LT |
8 | |
9 | struct vfsmount; | |
1f55a6ec | 10 | struct nameidata; |
1da177e4 | 11 | |
737bebd1 | 12 | enum { MAX_NESTED_LINKS = 8 }; |
1da177e4 | 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 |
1da177e4 | 27 | */ |
31e6b01f NP |
28 | #define LOOKUP_FOLLOW 0x0001 |
29 | #define LOOKUP_DIRECTORY 0x0002 | |
d94c177b | 30 | #define LOOKUP_AUTOMOUNT 0x0004 |
31e6b01f NP |
31 | |
32 | #define LOOKUP_PARENT 0x0010 | |
33 | #define LOOKUP_REVAL 0x0020 | |
34 | #define LOOKUP_RCU 0x0040 | |
b6c8069d | 35 | |
1da177e4 LT |
36 | /* |
37 | * Intent data | |
38 | */ | |
3516586a AV |
39 | #define LOOKUP_OPEN 0x0100 |
40 | #define LOOKUP_CREATE 0x0200 | |
41 | #define LOOKUP_EXCL 0x0400 | |
4e9ed2f8 | 42 | #define LOOKUP_RENAME_TARGET 0x0800 |
1da177e4 | 43 | |
16c2cd71 | 44 | #define LOOKUP_JUMPED 0x1000 |
5b6ca027 | 45 | #define LOOKUP_ROOT 0x2000 |
f52e0c11 | 46 | #define LOOKUP_EMPTY 0x4000 |
16c2cd71 | 47 | |
2d8f3038 | 48 | extern int user_path_at(int, const char __user *, unsigned, struct path *); |
1fa1e7f6 | 49 | extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty); |
2d8f3038 AV |
50 | |
51 | #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path) | |
52 | #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path) | |
53 | #define user_path_dir(name, path) \ | |
54 | user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path) | |
55 | ||
d1811465 AV |
56 | extern int kern_path(const char *, unsigned, struct path *); |
57 | ||
1ac12b4b JL |
58 | extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int); |
59 | extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int); | |
921a1650 | 60 | extern void done_path_create(struct path *, struct dentry *); |
79714f72 | 61 | extern struct dentry *kern_path_locked(const char *, struct path *); |
2d864651 | 62 | extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int); |
1da177e4 | 63 | |
eead1911 | 64 | extern struct dentry *lookup_one_len(const char *, struct dentry *, int); |
1da177e4 | 65 | |
cc53ce53 | 66 | extern int follow_down_one(struct path *); |
7cc90cc3 | 67 | extern int follow_down(struct path *); |
bab77ebf | 68 | extern int follow_up(struct path *); |
1da177e4 LT |
69 | |
70 | extern struct dentry *lock_rename(struct dentry *, struct dentry *); | |
71 | extern void unlock_rename(struct dentry *, struct dentry *); | |
72 | ||
b5fb63c1 | 73 | extern void nd_jump_link(struct nameidata *nd, struct path *path); |
1f55a6ec AV |
74 | extern void nd_set_link(struct nameidata *nd, char *path); |
75 | extern char *nd_get_link(struct nameidata *nd); | |
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 */ |