Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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
10struct open_intent {
11 int flags;
12 int create_mode;
13 struct file *file;
14};
15
16enum { MAX_NESTED_LINKS = 8 };
17
18struct nameidata {
19 struct path path;
20 struct qstr last;
21 struct path root;
22 struct inode *inode; /* path.dentry.d_inode */
23 unsigned int flags;
24 unsigned seq;
25 int last_type;
26 unsigned depth;
27 char *saved_names[MAX_NESTED_LINKS + 1];
28
29 /* Intent data */
30 union {
31 struct open_intent open;
32 } intent;
33};
34
35/*
36 * Type of the last component on LOOKUP_PARENT
37 */
38enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
39
40/*
41 * The bitmask for a lookup event:
42 * - follow links at the end
43 * - require a directory
44 * - ending slashes ok even for nonexistent files
45 * - internal "there are more path components" flag
46 * - dentry cache is untrusted; force a real lookup
47 * - suppress terminal automount
48 */
49#define LOOKUP_FOLLOW 0x0001
50#define LOOKUP_DIRECTORY 0x0002
51#define LOOKUP_AUTOMOUNT 0x0004
52
53#define LOOKUP_PARENT 0x0010
54#define LOOKUP_REVAL 0x0020
55#define LOOKUP_RCU 0x0040
56
57/*
58 * Intent data
59 */
60#define LOOKUP_OPEN 0x0100
61#define LOOKUP_CREATE 0x0200
62#define LOOKUP_EXCL 0x0400
63#define LOOKUP_RENAME_TARGET 0x0800
64
65#define LOOKUP_JUMPED 0x1000
66#define LOOKUP_ROOT 0x2000
67#define LOOKUP_EMPTY 0x4000
68
69extern int user_path_at(int, const char __user *, unsigned, struct path *);
70extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty);
71
72#define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path)
73#define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path)
74#define user_path_dir(name, path) \
75 user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path)
76
77extern int kern_path(const char *, unsigned, struct path *);
78
79extern struct dentry *kern_path_create(int, const char *, struct path *, int);
80extern struct dentry *user_path_create(int, const char __user *, struct path *, int);
81extern int kern_path_parent(const char *, struct nameidata *);
82extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
83 const char *, unsigned int, struct path *);
84
85extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
86 int (*open)(struct inode *, struct file *));
87
88extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
89
90extern int follow_down_one(struct path *);
91extern int follow_down(struct path *);
92extern int follow_up(struct path *);
93
94extern struct dentry *lock_rename(struct dentry *, struct dentry *);
95extern void unlock_rename(struct dentry *, struct dentry *);
96
97static inline void nd_set_link(struct nameidata *nd, char *path)
98{
99 nd->saved_names[nd->depth] = path;
100}
101
102static inline char *nd_get_link(struct nameidata *nd)
103{
104 return nd->saved_names[nd->depth];
105}
106
107static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
108{
109 ((char *) name)[min(len, maxlen)] = '\0';
110}
111
112#endif /* _LINUX_NAMEI_H */