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 LT |
5 | #include <linux/linkage.h> |
6 | ||
7 | struct vfsmount; | |
8 | ||
9 | struct open_intent { | |
10 | int flags; | |
11 | int create_mode; | |
834f2a4a | 12 | struct file *file; |
1da177e4 LT |
13 | }; |
14 | ||
737bebd1 | 15 | enum { MAX_NESTED_LINKS = 8 }; |
1da177e4 LT |
16 | |
17 | struct nameidata { | |
18 | struct dentry *dentry; | |
19 | struct vfsmount *mnt; | |
20 | struct qstr last; | |
21 | unsigned int flags; | |
22 | int last_type; | |
23 | unsigned depth; | |
24 | char *saved_names[MAX_NESTED_LINKS + 1]; | |
25 | ||
26 | /* Intent data */ | |
27 | union { | |
28 | struct open_intent open; | |
29 | } intent; | |
30 | }; | |
31 | ||
32 | /* | |
33 | * Type of the last component on LOOKUP_PARENT | |
34 | */ | |
35 | enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; | |
36 | ||
37 | /* | |
38 | * The bitmask for a lookup event: | |
39 | * - follow links at the end | |
40 | * - require a directory | |
41 | * - ending slashes ok even for nonexistent files | |
42 | * - internal "there are more path compnents" flag | |
43 | * - locked when lookup done with dcache_lock held | |
44 | * - dentry cache is untrusted; force a real lookup | |
45 | */ | |
46 | #define LOOKUP_FOLLOW 1 | |
47 | #define LOOKUP_DIRECTORY 2 | |
48 | #define LOOKUP_CONTINUE 4 | |
49 | #define LOOKUP_PARENT 16 | |
50 | #define LOOKUP_NOALT 32 | |
51 | #define LOOKUP_REVAL 64 | |
52 | /* | |
53 | * Intent data | |
54 | */ | |
55 | #define LOOKUP_OPEN (0x0100) | |
56 | #define LOOKUP_CREATE (0x0200) | |
57 | #define LOOKUP_ACCESS (0x0400) | |
650a8983 | 58 | #define LOOKUP_CHDIR (0x0800) |
1da177e4 LT |
59 | |
60 | extern int FASTCALL(__user_walk(const char __user *, unsigned, struct nameidata *)); | |
5590ff0d | 61 | extern int FASTCALL(__user_walk_fd(int dfd, const char __user *, unsigned, struct nameidata *)); |
1da177e4 | 62 | #define user_path_walk(name,nd) \ |
5590ff0d | 63 | __user_walk_fd(AT_FDCWD, name, LOOKUP_FOLLOW, nd) |
1da177e4 | 64 | #define user_path_walk_link(name,nd) \ |
5590ff0d | 65 | __user_walk_fd(AT_FDCWD, name, 0, nd) |
1da177e4 LT |
66 | extern int FASTCALL(path_lookup(const char *, unsigned, struct nameidata *)); |
67 | extern int FASTCALL(path_walk(const char *, struct nameidata *)); | |
68 | extern int FASTCALL(link_path_walk(const char *, struct nameidata *)); | |
69 | extern void path_release(struct nameidata *); | |
70 | extern void path_release_on_umount(struct nameidata *); | |
71 | ||
834f2a4a | 72 | extern int __user_path_lookup_open(const char __user *, unsigned lookup_flags, struct nameidata *nd, int open_flags); |
5590ff0d | 73 | extern int path_lookup_open(int dfd, const char *name, unsigned lookup_flags, struct nameidata *, int open_flags); |
834f2a4a TM |
74 | extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry, |
75 | int (*open)(struct inode *, struct file *)); | |
76 | extern struct file *nameidata_to_filp(struct nameidata *nd, int flags); | |
77 | extern void release_open_intent(struct nameidata *); | |
78 | ||
1da177e4 | 79 | extern struct dentry * lookup_one_len(const char *, struct dentry *, int); |
1da177e4 LT |
80 | |
81 | extern int follow_down(struct vfsmount **, struct dentry **); | |
82 | extern int follow_up(struct vfsmount **, struct dentry **); | |
83 | ||
84 | extern struct dentry *lock_rename(struct dentry *, struct dentry *); | |
85 | extern void unlock_rename(struct dentry *, struct dentry *); | |
86 | ||
87 | static inline void nd_set_link(struct nameidata *nd, char *path) | |
88 | { | |
89 | nd->saved_names[nd->depth] = path; | |
90 | } | |
91 | ||
92 | static inline char *nd_get_link(struct nameidata *nd) | |
93 | { | |
94 | return nd->saved_names[nd->depth]; | |
95 | } | |
96 | ||
97 | #endif /* _LINUX_NAMEI_H */ |