Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
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
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 file *file;
23 struct inode *inode; /* path.dentry.d_inode */
24 unsigned int flags;
25 unsigned seq;
26 int last_type;
27 unsigned depth;
28 char *saved_names[MAX_NESTED_LINKS + 1];
29
30 /* Intent data */
31 union {
32 struct open_intent open;
33 } intent;
34};
35
36/*
37 * Type of the last component on LOOKUP_PARENT
38 */
39enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
40
41/*
42 * The bitmask for a lookup event:
43 * - follow links at the end
44 * - require a directory
45 * - ending slashes ok even for nonexistent files
46 * - internal "there are more path components" flag
47 * - dentry cache is untrusted; force a real lookup
48 * - suppress terminal automount
49 */
50#define LOOKUP_FOLLOW 0x0001
51#define LOOKUP_DIRECTORY 0x0002
52#define LOOKUP_CONTINUE 0x0004
53
54#define LOOKUP_PARENT 0x0010
55#define LOOKUP_REVAL 0x0020
56#define LOOKUP_RCU 0x0040
57#define LOOKUP_NO_AUTOMOUNT 0x0080
58/*
59 * Intent data
60 */
61#define LOOKUP_OPEN 0x0100
62#define LOOKUP_CREATE 0x0200
63#define LOOKUP_EXCL 0x0400
64#define LOOKUP_RENAME_TARGET 0x0800
65
66extern int user_path_at(int, const char __user *, unsigned, struct path *);
67
68#define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path)
69#define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path)
70#define user_path_dir(name, path) \
71 user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path)
72
73extern int kern_path(const char *, unsigned, struct path *);
74
75extern int path_lookup(const char *, unsigned, struct nameidata *);
76extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
77 const char *, unsigned int, struct nameidata *);
78
79extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
80 int (*open)(struct inode *, struct file *));
81
82extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
83
84extern int follow_down_one(struct path *);
85extern int follow_down(struct path *, bool);
86extern int follow_up(struct path *);
87
88extern struct dentry *lock_rename(struct dentry *, struct dentry *);
89extern void unlock_rename(struct dentry *, struct dentry *);
90
91static inline void nd_set_link(struct nameidata *nd, char *path)
92{
93 nd->saved_names[nd->depth] = path;
94}
95
96static inline char *nd_get_link(struct nameidata *nd)
97{
98 return nd->saved_names[nd->depth];
99}
100
101static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
102{
103 ((char *) name)[min(len, maxlen)] = '\0';
104}
105
106#endif /* _LINUX_NAMEI_H */