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1da177e4 LT |
1 | #ifndef _LINUX_NAMEI_H |
2 | #define _LINUX_NAMEI_H | |
3 | ||
4 | #include <linux/linkage.h> | |
5 | ||
6 | struct vfsmount; | |
7 | ||
8 | struct open_intent { | |
9 | int flags; | |
10 | int create_mode; | |
834f2a4a | 11 | struct file *file; |
1da177e4 LT |
12 | }; |
13 | ||
14 | enum { MAX_NESTED_LINKS = 5 }; | |
15 | ||
16 | struct nameidata { | |
17 | struct dentry *dentry; | |
18 | struct vfsmount *mnt; | |
19 | struct qstr last; | |
20 | unsigned int flags; | |
21 | int last_type; | |
22 | unsigned depth; | |
23 | char *saved_names[MAX_NESTED_LINKS + 1]; | |
24 | ||
25 | /* Intent data */ | |
26 | union { | |
27 | struct open_intent open; | |
28 | } intent; | |
29 | }; | |
30 | ||
31 | /* | |
32 | * Type of the last component on LOOKUP_PARENT | |
33 | */ | |
34 | enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; | |
35 | ||
36 | /* | |
37 | * The bitmask for a lookup event: | |
38 | * - follow links at the end | |
39 | * - require a directory | |
40 | * - ending slashes ok even for nonexistent files | |
41 | * - internal "there are more path compnents" flag | |
42 | * - locked when lookup done with dcache_lock held | |
43 | * - dentry cache is untrusted; force a real lookup | |
44 | */ | |
45 | #define LOOKUP_FOLLOW 1 | |
46 | #define LOOKUP_DIRECTORY 2 | |
47 | #define LOOKUP_CONTINUE 4 | |
48 | #define LOOKUP_PARENT 16 | |
49 | #define LOOKUP_NOALT 32 | |
50 | #define LOOKUP_REVAL 64 | |
51 | /* | |
52 | * Intent data | |
53 | */ | |
54 | #define LOOKUP_OPEN (0x0100) | |
55 | #define LOOKUP_CREATE (0x0200) | |
56 | #define LOOKUP_ACCESS (0x0400) | |
57 | ||
58 | extern int FASTCALL(__user_walk(const char __user *, unsigned, struct nameidata *)); | |
59 | #define user_path_walk(name,nd) \ | |
60 | __user_walk(name, LOOKUP_FOLLOW, nd) | |
61 | #define user_path_walk_link(name,nd) \ | |
62 | __user_walk(name, 0, nd) | |
63 | extern int FASTCALL(path_lookup(const char *, unsigned, struct nameidata *)); | |
64 | extern int FASTCALL(path_walk(const char *, struct nameidata *)); | |
65 | extern int FASTCALL(link_path_walk(const char *, struct nameidata *)); | |
66 | extern void path_release(struct nameidata *); | |
67 | extern void path_release_on_umount(struct nameidata *); | |
68 | ||
834f2a4a TM |
69 | extern int __user_path_lookup_open(const char __user *, unsigned lookup_flags, struct nameidata *nd, int open_flags); |
70 | extern int path_lookup_open(const char *, unsigned lookup_flags, struct nameidata *, int open_flags); | |
71 | extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry, | |
72 | int (*open)(struct inode *, struct file *)); | |
73 | extern struct file *nameidata_to_filp(struct nameidata *nd, int flags); | |
74 | extern void release_open_intent(struct nameidata *); | |
75 | ||
1da177e4 | 76 | extern struct dentry * lookup_one_len(const char *, struct dentry *, int); |
49705b77 | 77 | extern struct dentry * lookup_hash(struct nameidata *); |
1da177e4 LT |
78 | |
79 | extern int follow_down(struct vfsmount **, struct dentry **); | |
80 | extern int follow_up(struct vfsmount **, struct dentry **); | |
81 | ||
82 | extern struct dentry *lock_rename(struct dentry *, struct dentry *); | |
83 | extern void unlock_rename(struct dentry *, struct dentry *); | |
84 | ||
85 | static inline void nd_set_link(struct nameidata *nd, char *path) | |
86 | { | |
87 | nd->saved_names[nd->depth] = path; | |
88 | } | |
89 | ||
90 | static inline char *nd_get_link(struct nameidata *nd) | |
91 | { | |
92 | return nd->saved_names[nd->depth]; | |
93 | } | |
94 | ||
95 | #endif /* _LINUX_NAMEI_H */ |