4 #include <linux/dcache.h>
5 #include <linux/linkage.h>
6 #include <linux/path.h>
16 enum { MAX_NESTED_LINKS = 8 };
24 char *saved_names[MAX_NESTED_LINKS + 1];
28 struct open_intent open;
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
54 #define LOOKUP_OPEN 0x0100
55 #define LOOKUP_CREATE 0x0200
56 #define LOOKUP_EXCL 0x0400
57 #define LOOKUP_RENAME_TARGET 0x0800
59 extern int user_path_at(int, const char __user *, unsigned, struct path *);
61 #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path)
62 #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path)
63 #define user_path_dir(name, path) \
64 user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path)
66 extern int kern_path(const char *, unsigned, struct path *);
68 extern int path_lookup(const char *, unsigned, struct nameidata *);
69 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
70 const char *, unsigned int, struct nameidata *);
72 extern int path_lookup_open(int dfd, const char *name, unsigned lookup_flags, struct nameidata *, int open_flags);
73 extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
74 int (*open)(struct inode *, struct file *));
75 extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);
76 extern void release_open_intent(struct nameidata *);
78 extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
79 extern struct dentry *lookup_one_noperm(const char *, struct dentry *);
81 extern int follow_down(struct vfsmount **, struct dentry **);
82 extern int follow_up(struct vfsmount **, struct dentry **);
84 extern struct dentry *lock_rename(struct dentry *, struct dentry *);
85 extern void unlock_rename(struct dentry *, struct dentry *);
87 static inline void nd_set_link(struct nameidata *nd, char *path)
89 nd->saved_names[nd->depth] = path;
92 static inline char *nd_get_link(struct nameidata *nd)
94 return nd->saved_names[nd->depth];
97 static inline void nd_terminate_link(void *name, size_t len, size_t maxlen)
99 ((char *) name)[min(len, maxlen)] = '\0';
102 #endif /* _LINUX_NAMEI_H */