Line data Source code
1 : #ifndef _LINUX_NAMEI_H
2 : #define _LINUX_NAMEI_H
3 :
4 : #include <linux/dcache.h>
5 : #include <linux/linkage.h>
6 : #include <linux/path.h>
7 :
8 : struct vfsmount;
9 :
10 : struct open_intent {
11 : int flags;
12 : int create_mode;
13 : struct file *file;
14 : };
15 :
16 : enum { MAX_NESTED_LINKS = 8 };
17 :
18 : struct nameidata {
19 2 : struct path path;
20 : struct qstr last;
21 : struct path root;
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
43 : * - internal "there are more path components" flag
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
51 : #define LOOKUP_REVAL 64
52 : /*
53 : * Intent data
54 : */
55 : #define LOOKUP_OPEN 0x0100
56 : #define LOOKUP_CREATE 0x0200
57 : #define LOOKUP_EXCL 0x0400
58 : #define LOOKUP_RENAME_TARGET 0x0800
59 :
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 :
67 : extern int kern_path(const char *, unsigned, struct path *);
68 :
69 : extern int path_lookup(const char *, unsigned, struct nameidata *);
70 : extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
71 : const char *, unsigned int, struct nameidata *);
72 :
73 : extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
74 : int (*open)(struct inode *, struct file *));
75 :
76 : extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
77 :
78 : extern int follow_down(struct path *);
79 : extern int follow_up(struct path *);
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 2 : nd->saved_names[nd->depth] = path;
87 2 : }
88 :
89 : static inline char *nd_get_link(struct nameidata *nd)
90 : {
91 : return nd->saved_names[nd->depth];
92 : }
93 :
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 1 :
99 : #endif /* _LINUX_NAMEI_H */
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