Staging: add wlan-ng prism2 usb driver
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / linux / namei.h
blob68f8c3203c89d4d7c42404e4084051342206b875
1 #ifndef _LINUX_NAMEI_H
2 #define _LINUX_NAMEI_H
4 #include <linux/dcache.h>
5 #include <linux/linkage.h>
6 #include <linux/path.h>
8 struct vfsmount;
10 struct open_intent {
11 int flags;
12 int create_mode;
13 struct file *file;
16 enum { MAX_NESTED_LINKS = 8 };
18 struct nameidata {
19 struct path path;
20 struct qstr last;
21 unsigned int flags;
22 int last_type;
23 unsigned depth;
24 char *saved_names[MAX_NESTED_LINKS + 1];
26 /* Intent data */
27 union {
28 struct open_intent open;
29 } intent;
33 * Type of the last component on LOOKUP_PARENT
35 enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
38 * The bitmask for a lookup event:
39 * - follow links at the end
40 * - require a directory
41 * - ending slashes ok even for nonexistent files
42 * - internal "there are more path compnents" flag
43 * - locked when lookup done with dcache_lock held
44 * - dentry cache is untrusted; force a real lookup
46 #define LOOKUP_FOLLOW 1
47 #define LOOKUP_DIRECTORY 2
48 #define LOOKUP_CONTINUE 4
49 #define LOOKUP_PARENT 16
50 #define LOOKUP_REVAL 64
52 * Intent data
54 #define LOOKUP_OPEN (0x0100)
55 #define LOOKUP_CREATE (0x0200)
57 extern int user_path_at(int, const char __user *, unsigned, struct path *);
59 #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path)
60 #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path)
61 #define user_path_dir(name, path) \
62 user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path)
64 extern int path_lookup(const char *, unsigned, struct nameidata *);
65 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
66 const char *, unsigned int, struct nameidata *);
68 extern int path_lookup_open(int dfd, const char *name, unsigned lookup_flags, struct nameidata *, int open_flags);
69 extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
70 int (*open)(struct inode *, struct file *));
71 extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);
72 extern void release_open_intent(struct nameidata *);
74 extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
75 extern struct dentry *lookup_one_noperm(const char *, struct dentry *);
77 extern int follow_down(struct vfsmount **, struct dentry **);
78 extern int follow_up(struct vfsmount **, struct dentry **);
80 extern struct dentry *lock_rename(struct dentry *, struct dentry *);
81 extern void unlock_rename(struct dentry *, struct dentry *);
83 static inline void nd_set_link(struct nameidata *nd, char *path)
85 nd->saved_names[nd->depth] = path;
88 static inline char *nd_get_link(struct nameidata *nd)
90 return nd->saved_names[nd->depth];
93 #endif /* _LINUX_NAMEI_H */