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