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/dcache.h>
5#include <linux/linkage.h>
6#include <linux/path.h>
7
8struct vfsmount;
9
10enum { MAX_NESTED_LINKS = 8 };
11
12struct nameidata {
13 struct path path;
14 struct qstr last;
15 struct path root;
16 struct inode *inode; /* path.dentry.d_inode */
17 unsigned int flags;
18 unsigned seq;
19 int last_type;
20 unsigned depth;
21 char *saved_names[MAX_NESTED_LINKS + 1];
22};
23
24/*
25 * Type of the last component on LOOKUP_PARENT
26 */
27enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
28
29/*
30 * The bitmask for a lookup event:
31 * - follow links at the end
32 * - require a directory
33 * - ending slashes ok even for nonexistent files
34 * - internal "there are more path components" flag
35 * - dentry cache is untrusted; force a real lookup
36 * - suppress terminal automount
37 */
38#define LOOKUP_FOLLOW 0x0001
39#define LOOKUP_DIRECTORY 0x0002
40#define LOOKUP_AUTOMOUNT 0x0004
41
42#define LOOKUP_PARENT 0x0010
43#define LOOKUP_REVAL 0x0020
44#define LOOKUP_RCU 0x0040
45
46/*
47 * Intent data
48 */
49#define LOOKUP_OPEN 0x0100
50#define LOOKUP_CREATE 0x0200
51#define LOOKUP_EXCL 0x0400
52#define LOOKUP_RENAME_TARGET 0x0800
53
54#define LOOKUP_JUMPED 0x1000
55#define LOOKUP_ROOT 0x2000
56#define LOOKUP_EMPTY 0x4000
57
58extern int user_path_at(int, const char __user *, unsigned, struct path *);
59extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty);
60
61#define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path)
62#define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path)
63#define user_path_dir(name, path) \
64 user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path)
65
66extern int kern_path(const char *, unsigned, struct path *);
67
68extern struct dentry *kern_path_create(int, const char *, struct path *, int);
69extern struct dentry *user_path_create(int, const char __user *, struct path *, int);
70extern void done_path_create(struct path *, struct dentry *);
71extern struct dentry *kern_path_locked(const char *, struct path *);
72extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
73 const char *, unsigned int, struct path *);
74
75extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
76
77extern int follow_down_one(struct path *);
78extern int follow_down(struct path *);
79extern int follow_up(struct path *);
80
81extern struct dentry *lock_rename(struct dentry *, struct dentry *);
82extern void unlock_rename(struct dentry *, struct dentry *);
83
84extern void nd_jump_link(struct nameidata *nd, struct path *path);
85
86static inline void nd_set_link(struct nameidata *nd, char *path)
87{
88 nd->saved_names[nd->depth] = path;
89}
90
91static inline char *nd_get_link(struct nameidata *nd)
92{
93 return nd->saved_names[nd->depth];
94}
95
96static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
97{
98 ((char *) name)[min(len, maxlen)] = '\0';
99}
100
101#endif /* _LINUX_NAMEI_H */