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/dcache.h>
5#include <linux/linkage.h>
6
7struct vfsmount;
8
9struct open_intent {
10 int flags;
11 int create_mode;
12 struct file *file;
13};
14
15enum { MAX_NESTED_LINKS = 8 };
16
17struct 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
32struct path {
33 struct vfsmount *mnt;
34 struct dentry *dentry;
35};
36
37/*
38 * Type of the last component on LOOKUP_PARENT
39 */
40enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
41
42/*
43 * The bitmask for a lookup event:
44 * - follow links at the end
45 * - require a directory
46 * - ending slashes ok even for nonexistent files
47 * - internal "there are more path compnents" flag
48 * - locked when lookup done with dcache_lock held
49 * - dentry cache is untrusted; force a real lookup
50 */
51#define LOOKUP_FOLLOW 1
52#define LOOKUP_DIRECTORY 2
53#define LOOKUP_CONTINUE 4
54#define LOOKUP_PARENT 16
55#define LOOKUP_NOALT 32
56#define LOOKUP_REVAL 64
57/*
58 * Intent data
59 */
60#define LOOKUP_OPEN (0x0100)
61#define LOOKUP_CREATE (0x0200)
62#define LOOKUP_ACCESS (0x0400)
63#define LOOKUP_CHDIR (0x0800)
64
65extern int FASTCALL(__user_walk(const char __user *, unsigned, struct nameidata *));
66extern int FASTCALL(__user_walk_fd(int dfd, const char __user *, unsigned, struct nameidata *));
67#define user_path_walk(name,nd) \
68 __user_walk_fd(AT_FDCWD, name, LOOKUP_FOLLOW, nd)
69#define user_path_walk_link(name,nd) \
70 __user_walk_fd(AT_FDCWD, name, 0, nd)
71extern int FASTCALL(path_lookup(const char *, unsigned, struct nameidata *));
72extern int FASTCALL(path_walk(const char *, struct nameidata *));
73extern int FASTCALL(link_path_walk(const char *, struct nameidata *));
74extern void path_release(struct nameidata *);
75extern void path_release_on_umount(struct nameidata *);
76
77extern int __user_path_lookup_open(const char __user *, unsigned lookup_flags, struct nameidata *nd, int open_flags);
78extern int path_lookup_open(int dfd, const char *name, unsigned lookup_flags, struct nameidata *, int open_flags);
79extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
80 int (*open)(struct inode *, struct file *));
81extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);
82extern void release_open_intent(struct nameidata *);
83
84extern struct dentry * lookup_one_len(const char *, struct dentry *, int);
85
86extern int follow_down(struct vfsmount **, struct dentry **);
87extern int follow_up(struct vfsmount **, struct dentry **);
88
89extern struct dentry *lock_rename(struct dentry *, struct dentry *);
90extern void unlock_rename(struct dentry *, struct dentry *);
91
92static inline void nd_set_link(struct nameidata *nd, char *path)
93{
94 nd->saved_names[nd->depth] = path;
95}
96
97static inline char *nd_get_link(struct nameidata *nd)
98{
99 return nd->saved_names[nd->depth];
100}
101
102#endif /* _LINUX_NAMEI_H */