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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;
Nick Piggin31e6b012011-01-07 17:49:52 +110022 struct inode *inode; /* path.dentry.d_inode */
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 unsigned int flags;
Nick Piggin31e6b012011-01-07 17:49:52 +110024 unsigned seq;
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 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
Ori Avtalion47a0dfa2009-06-16 12:17:53 +030045 * - internal "there are more path components" flag
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 * - dentry cache is untrusted; force a real lookup
David Howells6f45b652011-01-14 18:45:31 +000047 * - suppress terminal automount
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 */
Nick Piggin31e6b012011-01-07 17:49:52 +110049#define LOOKUP_FOLLOW 0x0001
50#define LOOKUP_DIRECTORY 0x0002
Nick Piggin31e6b012011-01-07 17:49:52 +110051
52#define LOOKUP_PARENT 0x0010
53#define LOOKUP_REVAL 0x0020
54#define LOOKUP_RCU 0x0040
David Howells6f45b652011-01-14 18:45:31 +000055#define LOOKUP_NO_AUTOMOUNT 0x0080
Linus Torvalds1da177e2005-04-16 15:20:36 -070056/*
57 * Intent data
58 */
Al Viro35165862008-08-05 03:00:49 -040059#define LOOKUP_OPEN 0x0100
60#define LOOKUP_CREATE 0x0200
61#define LOOKUP_EXCL 0x0400
OGAWA Hirofumi4e9ed2f2008-10-16 07:50:29 +090062#define LOOKUP_RENAME_TARGET 0x0800
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Al Viro16c2cd72011-02-22 15:50:10 -050064#define LOOKUP_JUMPED 0x1000
Al Viro5b6ca022011-03-09 23:04:47 -050065#define LOOKUP_ROOT 0x2000
Al Virof52e0c12011-03-14 18:56:51 -040066#define LOOKUP_EMPTY 0x4000
Al Viro16c2cd72011-02-22 15:50:10 -050067
Al Viro2d8f3032008-07-22 09:59:21 -040068extern int user_path_at(int, const char __user *, unsigned, struct path *);
69
70#define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path)
71#define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path)
72#define user_path_dir(name, path) \
73 user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path)
74
Al Virod1811462008-08-02 00:49:18 -040075extern int kern_path(const char *, unsigned, struct path *);
76
Al Virodae6ad82011-06-26 11:50:15 -040077extern struct dentry *kern_path_create(int, const char *, struct path *, int);
78extern struct dentry *user_path_create(int, const char __user *, struct path *, int);
Al Viroc9c6cac2011-02-16 15:15:47 -050079extern int kern_path_parent(const char *, struct nameidata *);
Josef 'Jeff' Sipek16f18202007-07-19 01:48:18 -070080extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
Al Viroe0a01242011-06-27 17:00:37 -040081 const char *, unsigned int, struct path *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
Trond Myklebust834f2a42005-10-18 14:20:16 -070083extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
84 int (*open)(struct inode *, struct file *));
Trond Myklebust834f2a42005-10-18 14:20:16 -070085
Christoph Hellwigeead1912007-10-16 23:25:38 -070086extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
David Howellscc53ce52011-01-14 18:45:26 +000088extern int follow_down_one(struct path *);
Al Viro7cc90cc2011-03-18 09:04:20 -040089extern int follow_down(struct path *);
Al Virobab77eb2009-04-18 03:26:48 -040090extern int follow_up(struct path *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92extern struct dentry *lock_rename(struct dentry *, struct dentry *);
93extern void unlock_rename(struct dentry *, struct dentry *);
94
95static inline void nd_set_link(struct nameidata *nd, char *path)
96{
97 nd->saved_names[nd->depth] = path;
98}
99
100static inline char *nd_get_link(struct nameidata *nd)
101{
102 return nd->saved_names[nd->depth];
103}
104
Duane Griffin03514682008-12-19 20:47:11 +0000105static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
106{
107 ((char *) name)[min(len, maxlen)] = '\0';
108}
109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110#endif /* _LINUX_NAMEI_H */