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; | |
10 | ||
737bebd1 | 11 | enum { MAX_NESTED_LINKS = 8 }; |
1da177e4 LT |
12 | |
13 | struct nameidata { | |
4ac91378 | 14 | struct path path; |
1da177e4 | 15 | struct qstr last; |
2a737871 | 16 | struct path root; |
31e6b01f | 17 | struct inode *inode; /* path.dentry.d_inode */ |
1da177e4 | 18 | unsigned int flags; |
48a066e7 | 19 | unsigned seq, m_seq; |
1da177e4 LT |
20 | int last_type; |
21 | unsigned depth; | |
22 | char *saved_names[MAX_NESTED_LINKS + 1]; | |
1da177e4 LT |
23 | }; |
24 | ||
25 | /* | |
26 | * Type of the last component on LOOKUP_PARENT | |
27 | */ | |
28 | enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; | |
29 | ||
30 | /* | |
31 | * The bitmask for a lookup event: | |
32 | * - follow links at the end | |
33 | * - require a directory | |
34 | * - ending slashes ok even for nonexistent files | |
47a0dfaa | 35 | * - internal "there are more path components" flag |
1da177e4 | 36 | * - dentry cache is untrusted; force a real lookup |
6f45b656 | 37 | * - suppress terminal automount |
1da177e4 | 38 | */ |
31e6b01f NP |
39 | #define LOOKUP_FOLLOW 0x0001 |
40 | #define LOOKUP_DIRECTORY 0x0002 | |
d94c177b | 41 | #define LOOKUP_AUTOMOUNT 0x0004 |
31e6b01f NP |
42 | |
43 | #define LOOKUP_PARENT 0x0010 | |
44 | #define LOOKUP_REVAL 0x0020 | |
45 | #define LOOKUP_RCU 0x0040 | |
b6c8069d | 46 | |
1da177e4 LT |
47 | /* |
48 | * Intent data | |
49 | */ | |
3516586a AV |
50 | #define LOOKUP_OPEN 0x0100 |
51 | #define LOOKUP_CREATE 0x0200 | |
52 | #define LOOKUP_EXCL 0x0400 | |
4e9ed2f8 | 53 | #define LOOKUP_RENAME_TARGET 0x0800 |
1da177e4 | 54 | |
16c2cd71 | 55 | #define LOOKUP_JUMPED 0x1000 |
5b6ca027 | 56 | #define LOOKUP_ROOT 0x2000 |
f52e0c11 | 57 | #define LOOKUP_EMPTY 0x4000 |
16c2cd71 | 58 | |
2d8f3038 | 59 | extern int user_path_at(int, const char __user *, unsigned, struct path *); |
1fa1e7f6 | 60 | extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty); |
2d8f3038 AV |
61 | |
62 | #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path) | |
63 | #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path) | |
64 | #define user_path_dir(name, path) \ | |
65 | user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path) | |
66 | ||
d1811465 AV |
67 | extern int kern_path(const char *, unsigned, struct path *); |
68 | ||
1ac12b4b JL |
69 | extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int); |
70 | extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int); | |
921a1650 | 71 | extern void done_path_create(struct path *, struct dentry *); |
79714f72 | 72 | extern struct dentry *kern_path_locked(const char *, struct path *); |
2d864651 | 73 | extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int); |
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 */ |