4 #include <linux/dcache.h>
5 #include <linux/linkage.h>
6 #include <linux/path.h>
16 enum { MAX_NESTED_LINKS = 8 };
19 struct dentry *dentry;
25 char *saved_names[MAX_NESTED_LINKS + 1];
29 struct open_intent open;
34 * Type of the last component on LOOKUP_PARENT
36 enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
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
43 * - internal "there are more path compnents" flag
44 * - locked when lookup done with dcache_lock held
45 * - dentry cache is untrusted; force a real lookup
47 #define LOOKUP_FOLLOW 1
48 #define LOOKUP_DIRECTORY 2
49 #define LOOKUP_CONTINUE 4
50 #define LOOKUP_PARENT 16
51 #define LOOKUP_NOALT 32
52 #define LOOKUP_REVAL 64
56 #define LOOKUP_OPEN (0x0100)
57 #define LOOKUP_CREATE (0x0200)
58 #define LOOKUP_ACCESS (0x0400)
59 #define LOOKUP_CHDIR (0x0800)
61 extern int __user_walk(const char __user *, unsigned, struct nameidata *);
62 extern int __user_walk_fd(int dfd, const char __user *, unsigned, struct nameidata *);
63 #define user_path_walk(name,nd) \
64 __user_walk_fd(AT_FDCWD, name, LOOKUP_FOLLOW, nd)
65 #define user_path_walk_link(name,nd) \
66 __user_walk_fd(AT_FDCWD, name, 0, nd)
67 extern int path_lookup(const char *, unsigned, struct nameidata *);
68 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
69 const char *, unsigned int, struct nameidata *);
70 extern void path_release(struct nameidata *);
72 extern int __user_path_lookup_open(const char __user *, unsigned lookup_flags, struct nameidata *nd, int open_flags);
73 extern int path_lookup_open(int dfd, const char *name, unsigned lookup_flags, struct nameidata *, int open_flags);
74 extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
75 int (*open)(struct inode *, struct file *));
76 extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);
77 extern void release_open_intent(struct nameidata *);
79 extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
80 extern struct dentry *lookup_one_noperm(const char *, struct dentry *);
82 extern int follow_down(struct vfsmount **, struct dentry **);
83 extern int follow_up(struct vfsmount **, struct dentry **);
85 extern struct dentry *lock_rename(struct dentry *, struct dentry *);
86 extern void unlock_rename(struct dentry *, struct dentry *);
88 static inline void nd_set_link(struct nameidata *nd, char *path)
90 nd->saved_names[nd->depth] = path;
93 static inline char *nd_get_link(struct nameidata *nd)
95 return nd->saved_names[nd->depth];
98 #endif /* _LINUX_NAMEI_H */