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 struct path path;
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)
58 #define LOOKUP_CHDIR (0x0800)
59
60 extern int __user_walk(const char __user *, unsigned, struct nameidata *);
61 extern int __user_walk_fd(int dfd, const char __user *, unsigned, struct nameidata *);
62 #define user_path_walk(name,nd) \
63 __user_walk_fd(AT_FDCWD, name, LOOKUP_FOLLOW, nd)
64 #define user_path_walk_link(name,nd) \
65 __user_walk_fd(AT_FDCWD, name, 0, nd)
66 extern int path_lookup(const char *, unsigned, struct nameidata *);
67 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
68 const char *, unsigned int, struct nameidata *);
69
70 extern int __user_path_lookup_open(const char __user *, unsigned lookup_flags, struct nameidata *nd, int open_flags);
71 extern int path_lookup_open(int dfd, const char *name, unsigned lookup_flags, struct nameidata *, int open_flags);
72 extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
73 int (*open)(struct inode *, struct file *));
74 extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);
75 extern void release_open_intent(struct nameidata *);
76
77 extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
78 extern struct dentry *lookup_one_noperm(const char *, struct dentry *);
79
80 extern int follow_down(struct vfsmount **, struct dentry **);
81 extern int follow_up(struct vfsmount **, struct dentry **);
82
83 extern struct dentry *lock_rename(struct dentry *, struct dentry *);
84 extern void unlock_rename(struct dentry *, struct dentry *);
85
86 static inline void nd_set_link(struct nameidata *nd, char *path)
87 {
88 nd->saved_names[nd->depth] = path;
89 }
90
91 static inline char *nd_get_link(struct nameidata *nd)
92 {
93 return nd->saved_names[nd->depth];
94 }
95
96 #endif /* _LINUX_NAMEI_H */
97
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