4 #include <linux/dcache.h>
5 #include <linux/linkage.h>
15 enum { MAX_NESTED_LINKS
= 8 };
18 struct dentry
*dentry
;
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_NOALT 32
51 #define LOOKUP_REVAL 64
55 #define LOOKUP_OPEN (0x0100)
56 #define LOOKUP_CREATE (0x0200)
57 #define LOOKUP_ACCESS (0x0400)
58 #define LOOKUP_CHDIR (0x0800)
60 extern int FASTCALL(__user_walk(const char __user
*, unsigned, struct nameidata
*));
61 extern int FASTCALL(__user_walk_fd(int dfd
, const char __user
*, unsigned, struct nameidata
*));
62 #define user_path_walk(name,nd) \
63 __user_walk_fd(AT_FDCWD, name, LOOKUP_FOLLOW, nd)
64 #define user_path_walk_link(name,nd) \
65 __user_walk_fd(AT_FDCWD, name, 0, nd)
66 extern int FASTCALL(path_lookup(const char *, unsigned, struct nameidata
*));
67 extern int FASTCALL(path_walk(const char *, struct nameidata
*));
68 extern int FASTCALL(link_path_walk(const char *, struct nameidata
*));
69 extern void path_release(struct nameidata
*);
70 extern void path_release_on_umount(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);
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 #endif /* _LINUX_NAMEI_H */