signal: Use task_is_*
[linux-2.6/mini2440.git] / include / linux / namei.h
blob4cb4f8d2f78d283d6046e3dd23f3b427ee6525be
1 #ifndef _LINUX_NAMEI_H
2 #define _LINUX_NAMEI_H
4 #include <linux/dcache.h>
5 #include <linux/linkage.h>
7 struct vfsmount;
9 struct open_intent {
10 int flags;
11 int create_mode;
12 struct file *file;
15 enum { MAX_NESTED_LINKS = 8 };
17 struct nameidata {
18 struct dentry *dentry;
19 struct vfsmount *mnt;
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;
32 struct path {
33 struct vfsmount *mnt;
34 struct dentry *dentry;
38 * Type of the last component on LOOKUP_PARENT
40 enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
43 * The bitmask for a lookup event:
44 * - follow links at the end
45 * - require a directory
46 * - ending slashes ok even for nonexistent files
47 * - internal "there are more path compnents" flag
48 * - locked when lookup done with dcache_lock held
49 * - dentry cache is untrusted; force a real lookup
51 #define LOOKUP_FOLLOW 1
52 #define LOOKUP_DIRECTORY 2
53 #define LOOKUP_CONTINUE 4
54 #define LOOKUP_PARENT 16
55 #define LOOKUP_NOALT 32
56 #define LOOKUP_REVAL 64
58 * Intent data
60 #define LOOKUP_OPEN (0x0100)
61 #define LOOKUP_CREATE (0x0200)
62 #define LOOKUP_ACCESS (0x0400)
63 #define LOOKUP_CHDIR (0x0800)
65 extern int FASTCALL(__user_walk(const char __user *, unsigned, struct nameidata *));
66 extern int FASTCALL(__user_walk_fd(int dfd, const char __user *, unsigned, struct nameidata *));
67 #define user_path_walk(name,nd) \
68 __user_walk_fd(AT_FDCWD, name, LOOKUP_FOLLOW, nd)
69 #define user_path_walk_link(name,nd) \
70 __user_walk_fd(AT_FDCWD, name, 0, nd)
71 extern int FASTCALL(path_lookup(const char *, unsigned, struct nameidata *));
72 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
73 const char *, unsigned int, struct nameidata *);
74 extern void path_release(struct nameidata *);
75 extern void path_release_on_umount(struct nameidata *);
77 extern int __user_path_lookup_open(const char __user *, unsigned lookup_flags, struct nameidata *nd, int open_flags);
78 extern int path_lookup_open(int dfd, const char *name, unsigned lookup_flags, struct nameidata *, int open_flags);
79 extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
80 int (*open)(struct inode *, struct file *));
81 extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);
82 extern void release_open_intent(struct nameidata *);
84 extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
85 extern struct dentry *lookup_one_noperm(const char *, struct dentry *);
87 extern int follow_down(struct vfsmount **, struct dentry **);
88 extern int follow_up(struct vfsmount **, struct dentry **);
90 extern struct dentry *lock_rename(struct dentry *, struct dentry *);
91 extern void unlock_rename(struct dentry *, struct dentry *);
93 static inline void nd_set_link(struct nameidata *nd, char *path)
95 nd->saved_names[nd->depth] = path;
98 static inline char *nd_get_link(struct nameidata *nd)
100 return nd->saved_names[nd->depth];
103 #endif /* _LINUX_NAMEI_H */