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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _LINUX_NAMEI_H
2#define _LINUX_NAMEI_H
3
Alexey Dobriyan82b05472006-09-30 23:27:22 -07004#include <linux/dcache.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#include <linux/linkage.h>
Jan Blunckc5e725f2008-02-14 19:34:31 -08006#include <linux/path.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007
8struct vfsmount;
9
10struct open_intent {
11 int flags;
12 int create_mode;
Trond Myklebust834f2a42005-10-18 14:20:16 -070013 struct file *file;
Linus Torvalds1da177e2005-04-16 15:20:36 -070014};
15
Al Viro737bebd2006-07-14 00:24:29 -070016enum { MAX_NESTED_LINKS = 8 };
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
18struct nameidata {
Jan Blunck4ac91372008-02-14 19:34:32 -080019 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 struct qstr last;
Al Viro2a737872009-04-07 11:49:53 -040021 struct path root;
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 unsigned int flags;
23 int last_type;
24 unsigned depth;
25 char *saved_names[MAX_NESTED_LINKS + 1];
26
27 /* Intent data */
28 union {
29 struct open_intent open;
30 } intent;
31};
32
33/*
34 * Type of the last component on LOOKUP_PARENT
35 */
36enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
37
38/*
39 * The bitmask for a lookup event:
40 * - follow links at the end
41 * - require a directory
42 * - ending slashes ok even for nonexistent files
Ori Avtalion47a0dfa2009-06-16 12:17:53 +030043 * - internal "there are more path components" flag
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 * - locked when lookup done with dcache_lock held
45 * - dentry cache is untrusted; force a real lookup
46 */
47#define LOOKUP_FOLLOW 1
48#define LOOKUP_DIRECTORY 2
49#define LOOKUP_CONTINUE 4
50#define LOOKUP_PARENT 16
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#define LOOKUP_REVAL 64
52/*
53 * Intent data
54 */
Al Viro35165862008-08-05 03:00:49 -040055#define LOOKUP_OPEN 0x0100
56#define LOOKUP_CREATE 0x0200
57#define LOOKUP_EXCL 0x0400
OGAWA Hirofumi4e9ed2f2008-10-16 07:50:29 +090058#define LOOKUP_RENAME_TARGET 0x0800
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Al Viro2d8f3032008-07-22 09:59:21 -040060extern int user_path_at(int, const char __user *, unsigned, struct path *);
61
62#define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path)
63#define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path)
64#define user_path_dir(name, path) \
65 user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path)
66
Al Virod1811462008-08-02 00:49:18 -040067extern int kern_path(const char *, unsigned, struct path *);
68
Harvey Harrisonb3c97522008-02-13 15:03:15 -080069extern int path_lookup(const char *, unsigned, struct nameidata *);
Josef 'Jeff' Sipek16f18202007-07-19 01:48:18 -070070extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
71 const char *, unsigned int, struct nameidata *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Trond Myklebust834f2a42005-10-18 14:20:16 -070073extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
74 int (*open)(struct inode *, struct file *));
Trond Myklebust834f2a42005-10-18 14:20:16 -070075
Christoph Hellwigeead1912007-10-16 23:25:38 -070076extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Al Viro9393bd02009-04-18 13:58:15 -040078extern int follow_down(struct path *);
Al Virobab77eb2009-04-18 03:26:48 -040079extern int follow_up(struct path *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
81extern struct dentry *lock_rename(struct dentry *, struct dentry *);
82extern void unlock_rename(struct dentry *, struct dentry *);
83
84static inline void nd_set_link(struct nameidata *nd, char *path)
85{
86 nd->saved_names[nd->depth] = path;
87}
88
89static inline char *nd_get_link(struct nameidata *nd)
90{
91 return nd->saved_names[nd->depth];
92}
93
Duane Griffin03514682008-12-19 20:47:11 +000094static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
95{
96 ((char *) name)[min(len, maxlen)] = '\0';
97}
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099#endif /* _LINUX_NAMEI_H */