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 | ||
10 | struct open_intent { | |
11 | int flags; | |
12 | int create_mode; | |
834f2a4a | 13 | struct file *file; |
1da177e4 LT |
14 | }; |
15 | ||
737bebd1 | 16 | enum { MAX_NESTED_LINKS = 8 }; |
1da177e4 LT |
17 | |
18 | struct nameidata { | |
4ac91378 | 19 | struct path path; |
1da177e4 | 20 | struct qstr last; |
2a737871 | 21 | struct path root; |
1da177e4 LT |
22 | unsigned int flags; |
23 | int last_type; | |
24 | unsigned depth; | |
25 | char *saved_names[MAX_NESTED_LINKS + 1]; | |
26 | ||
27 | /* Intent data */ | |
28 | union { | |
29 | struct open_intent open; | |
30 | } intent; | |
31 | }; | |
32 | ||
33 | /* | |
34 | * Type of the last component on LOOKUP_PARENT | |
35 | */ | |
36 | enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; | |
37 | ||
38 | /* | |
39 | * The bitmask for a lookup event: | |
40 | * - follow links at the end | |
41 | * - require a directory | |
42 | * - ending slashes ok even for nonexistent files | |
47a0dfaa | 43 | * - internal "there are more path components" flag |
1da177e4 LT |
44 | * - locked when lookup done with dcache_lock held |
45 | * - dentry cache is untrusted; force a real lookup | |
46 | */ | |
47 | #define LOOKUP_FOLLOW 1 | |
48 | #define LOOKUP_DIRECTORY 2 | |
49 | #define LOOKUP_CONTINUE 4 | |
50 | #define LOOKUP_PARENT 16 | |
1da177e4 LT |
51 | #define LOOKUP_REVAL 64 |
52 | /* | |
53 | * Intent data | |
54 | */ | |
3516586a AV |
55 | #define LOOKUP_OPEN 0x0100 |
56 | #define LOOKUP_CREATE 0x0200 | |
57 | #define LOOKUP_EXCL 0x0400 | |
4e9ed2f8 | 58 | #define LOOKUP_RENAME_TARGET 0x0800 |
1da177e4 | 59 | |
2d8f3038 AV |
60 | extern int user_path_at(int, const char __user *, unsigned, struct path *); |
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 | ||
b3c97528 | 69 | extern int path_lookup(const char *, unsigned, struct nameidata *); |
16f18200 JJS |
70 | extern int vfs_path_lookup(struct dentry *, struct vfsmount *, |
71 | const char *, unsigned int, struct nameidata *); | |
1da177e4 | 72 | |
834f2a4a TM |
73 | extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry, |
74 | int (*open)(struct inode *, struct file *)); | |
834f2a4a | 75 | |
eead1911 | 76 | extern struct dentry *lookup_one_len(const char *, struct dentry *, int); |
1da177e4 | 77 | |
9393bd07 | 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 | ||
84 | static inline void nd_set_link(struct nameidata *nd, char *path) | |
85 | { | |
86 | nd->saved_names[nd->depth] = path; | |
87 | } | |
88 | ||
89 | static inline char *nd_get_link(struct nameidata *nd) | |
90 | { | |
91 | return nd->saved_names[nd->depth]; | |
92 | } | |
93 | ||
03514685 DG |
94 | static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) |
95 | { | |
96 | ((char *) name)[min(len, maxlen)] = '\0'; | |
97 | } | |
98 | ||
1da177e4 | 99 | #endif /* _LINUX_NAMEI_H */ |