Commit | Line | Data |
---|---|---|
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; |
31e6b01f NP |
22 | struct file *file; |
23 | struct inode *inode; /* path.dentry.d_inode */ | |
1da177e4 | 24 | unsigned int flags; |
31e6b01f | 25 | unsigned seq; |
1da177e4 LT |
26 | int last_type; |
27 | unsigned depth; | |
28 | char *saved_names[MAX_NESTED_LINKS + 1]; | |
29 | ||
30 | /* Intent data */ | |
31 | union { | |
32 | struct open_intent open; | |
33 | } intent; | |
34 | }; | |
35 | ||
36 | /* | |
37 | * Type of the last component on LOOKUP_PARENT | |
38 | */ | |
39 | enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; | |
40 | ||
41 | /* | |
42 | * The bitmask for a lookup event: | |
43 | * - follow links at the end | |
44 | * - require a directory | |
45 | * - ending slashes ok even for nonexistent files | |
47a0dfaa | 46 | * - internal "there are more path components" flag |
1da177e4 | 47 | * - dentry cache is untrusted; force a real lookup |
6f45b656 | 48 | * - suppress terminal automount |
1da177e4 | 49 | */ |
31e6b01f NP |
50 | #define LOOKUP_FOLLOW 0x0001 |
51 | #define LOOKUP_DIRECTORY 0x0002 | |
52 | #define LOOKUP_CONTINUE 0x0004 | |
53 | ||
54 | #define LOOKUP_PARENT 0x0010 | |
55 | #define LOOKUP_REVAL 0x0020 | |
56 | #define LOOKUP_RCU 0x0040 | |
6f45b656 | 57 | #define LOOKUP_NO_AUTOMOUNT 0x0080 |
1da177e4 LT |
58 | /* |
59 | * Intent data | |
60 | */ | |
3516586a AV |
61 | #define LOOKUP_OPEN 0x0100 |
62 | #define LOOKUP_CREATE 0x0200 | |
63 | #define LOOKUP_EXCL 0x0400 | |
4e9ed2f8 | 64 | #define LOOKUP_RENAME_TARGET 0x0800 |
1da177e4 | 65 | |
2d8f3038 AV |
66 | extern int user_path_at(int, const char __user *, unsigned, struct path *); |
67 | ||
68 | #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path) | |
69 | #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path) | |
70 | #define user_path_dir(name, path) \ | |
71 | user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path) | |
72 | ||
d1811465 AV |
73 | extern int kern_path(const char *, unsigned, struct path *); |
74 | ||
b3c97528 | 75 | extern int path_lookup(const char *, unsigned, struct nameidata *); |
16f18200 JJS |
76 | extern int vfs_path_lookup(struct dentry *, struct vfsmount *, |
77 | const char *, unsigned int, struct nameidata *); | |
1da177e4 | 78 | |
834f2a4a TM |
79 | extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry, |
80 | int (*open)(struct inode *, struct file *)); | |
834f2a4a | 81 | |
eead1911 | 82 | extern struct dentry *lookup_one_len(const char *, struct dentry *, int); |
1da177e4 | 83 | |
cc53ce53 DH |
84 | extern int follow_down_one(struct path *); |
85 | extern int follow_down(struct path *, bool); | |
bab77ebf | 86 | extern int follow_up(struct path *); |
1da177e4 LT |
87 | |
88 | extern struct dentry *lock_rename(struct dentry *, struct dentry *); | |
89 | extern void unlock_rename(struct dentry *, struct dentry *); | |
90 | ||
91 | static inline void nd_set_link(struct nameidata *nd, char *path) | |
92 | { | |
93 | nd->saved_names[nd->depth] = path; | |
94 | } | |
95 | ||
96 | static inline char *nd_get_link(struct nameidata *nd) | |
97 | { | |
98 | return nd->saved_names[nd->depth]; | |
99 | } | |
100 | ||
03514685 DG |
101 | static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) |
102 | { | |
103 | ((char *) name)[min(len, maxlen)] = '\0'; | |
104 | } | |
105 | ||
1da177e4 | 106 | #endif /* _LINUX_NAMEI_H */ |