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Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_NAMEI_H |
2 | #define _LINUX_NAMEI_H | |
3 | ||
82b0547c | 4 | #include <linux/dcache.h> |
1da177e4 | 5 | #include <linux/linkage.h> |
c5e725f3 | 6 | #include <linux/path.h> |
1da177e4 LT |
7 | |
8 | struct vfsmount; | |
9 | ||
737bebd1 | 10 | enum { MAX_NESTED_LINKS = 8 }; |
1da177e4 LT |
11 | |
12 | struct nameidata { | |
4ac91378 | 13 | struct path path; |
1da177e4 | 14 | struct qstr last; |
2a737871 | 15 | struct path root; |
31e6b01f | 16 | struct inode *inode; /* path.dentry.d_inode */ |
1da177e4 | 17 | unsigned int flags; |
31e6b01f | 18 | unsigned seq; |
1da177e4 LT |
19 | int last_type; |
20 | unsigned depth; | |
21 | char *saved_names[MAX_NESTED_LINKS + 1]; | |
1da177e4 LT |
22 | }; |
23 | ||
24 | /* | |
25 | * Type of the last component on LOOKUP_PARENT | |
26 | */ | |
27 | enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; | |
28 | ||
29 | /* | |
30 | * The bitmask for a lookup event: | |
31 | * - follow links at the end | |
32 | * - require a directory | |
33 | * - ending slashes ok even for nonexistent files | |
47a0dfaa | 34 | * - internal "there are more path components" flag |
1da177e4 | 35 | * - dentry cache is untrusted; force a real lookup |
6f45b656 | 36 | * - suppress terminal automount |
1da177e4 | 37 | */ |
31e6b01f NP |
38 | #define LOOKUP_FOLLOW 0x0001 |
39 | #define LOOKUP_DIRECTORY 0x0002 | |
d94c177b | 40 | #define LOOKUP_AUTOMOUNT 0x0004 |
31e6b01f NP |
41 | |
42 | #define LOOKUP_PARENT 0x0010 | |
43 | #define LOOKUP_REVAL 0x0020 | |
44 | #define LOOKUP_RCU 0x0040 | |
b6c8069d | 45 | |
1da177e4 LT |
46 | /* |
47 | * Intent data | |
48 | */ | |
3516586a AV |
49 | #define LOOKUP_OPEN 0x0100 |
50 | #define LOOKUP_CREATE 0x0200 | |
51 | #define LOOKUP_EXCL 0x0400 | |
4e9ed2f8 | 52 | #define LOOKUP_RENAME_TARGET 0x0800 |
1da177e4 | 53 | |
16c2cd71 | 54 | #define LOOKUP_JUMPED 0x1000 |
5b6ca027 | 55 | #define LOOKUP_ROOT 0x2000 |
f52e0c11 | 56 | #define LOOKUP_EMPTY 0x4000 |
16c2cd71 | 57 | |
2d8f3038 | 58 | extern int user_path_at(int, const char __user *, unsigned, struct path *); |
1fa1e7f6 | 59 | extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty); |
2d8f3038 AV |
60 | |
61 | #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path) | |
62 | #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path) | |
63 | #define user_path_dir(name, path) \ | |
64 | user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path) | |
65 | ||
d1811465 AV |
66 | extern int kern_path(const char *, unsigned, struct path *); |
67 | ||
dae6ad8f AV |
68 | extern struct dentry *kern_path_create(int, const char *, struct path *, int); |
69 | extern struct dentry *user_path_create(int, const char __user *, struct path *, int); | |
921a1650 | 70 | extern void done_path_create(struct path *, struct dentry *); |
79714f72 | 71 | extern struct dentry *kern_path_locked(const char *, struct path *); |
16f18200 | 72 | extern int vfs_path_lookup(struct dentry *, struct vfsmount *, |
e0a01249 | 73 | const char *, unsigned int, struct path *); |
1da177e4 | 74 | |
eead1911 | 75 | extern struct dentry *lookup_one_len(const char *, struct dentry *, int); |
1da177e4 | 76 | |
cc53ce53 | 77 | extern int follow_down_one(struct path *); |
7cc90cc3 | 78 | extern int follow_down(struct path *); |
bab77ebf | 79 | extern int follow_up(struct path *); |
1da177e4 LT |
80 | |
81 | extern struct dentry *lock_rename(struct dentry *, struct dentry *); | |
82 | extern void unlock_rename(struct dentry *, struct dentry *); | |
83 | ||
b5fb63c1 CH |
84 | extern void nd_jump_link(struct nameidata *nd, struct path *path); |
85 | ||
1da177e4 LT |
86 | static inline void nd_set_link(struct nameidata *nd, char *path) |
87 | { | |
88 | nd->saved_names[nd->depth] = path; | |
89 | } | |
90 | ||
91 | static inline char *nd_get_link(struct nameidata *nd) | |
92 | { | |
93 | return nd->saved_names[nd->depth]; | |
94 | } | |
95 | ||
03514685 DG |
96 | static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) |
97 | { | |
98 | ((char *) name)[min(len, maxlen)] = '\0'; | |
99 | } | |
100 | ||
b9d6ba94 JL |
101 | /** |
102 | * retry_estale - determine whether the caller should retry an operation | |
103 | * @error: the error that would currently be returned | |
104 | * @flags: flags being used for next lookup attempt | |
105 | * | |
106 | * Check to see if the error code was -ESTALE, and then determine whether | |
107 | * to retry the call based on whether "flags" already has LOOKUP_REVAL set. | |
108 | * | |
109 | * Returns true if the caller should try the operation again. | |
110 | */ | |
111 | static inline bool | |
112 | retry_estale(const long error, const unsigned int flags) | |
113 | { | |
114 | return error == -ESTALE && !(flags & LOOKUP_REVAL); | |
115 | } | |
116 | ||
1da177e4 | 117 | #endif /* _LINUX_NAMEI_H */ |