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