4 #include <linux/dcache.h>
5 #include <linux/linkage.h>
6 #include <linux/path.h>
16 enum { MAX_NESTED_LINKS
= 8 };
23 struct inode
*inode
; /* path.dentry.d_inode */
28 char *saved_names
[MAX_NESTED_LINKS
+ 1];
32 struct open_intent open
;
37 * Type of the last component on LOOKUP_PARENT
39 enum {LAST_NORM
, LAST_ROOT
, LAST_DOT
, LAST_DOTDOT
, LAST_BIND
};
42 * The bitmask for a lookup event:
43 * - follow links at the end
44 * - require a directory
45 * - ending slashes ok even for nonexistent files
46 * - internal "there are more path components" flag
47 * - dentry cache is untrusted; force a real lookup
49 #define LOOKUP_FOLLOW 0x0001
50 #define LOOKUP_DIRECTORY 0x0002
51 #define LOOKUP_CONTINUE 0x0004
53 #define LOOKUP_PARENT 0x0010
54 #define LOOKUP_REVAL 0x0020
55 #define LOOKUP_RCU 0x0040
59 #define LOOKUP_OPEN 0x0100
60 #define LOOKUP_CREATE 0x0200
61 #define LOOKUP_EXCL 0x0400
62 #define LOOKUP_RENAME_TARGET 0x0800
64 extern int user_path_at(int, const char __user
*, unsigned, struct path
*);
66 #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path)
67 #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path)
68 #define user_path_dir(name, path) \
69 user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path)
71 extern int kern_path(const char *, unsigned, struct path
*);
73 extern int path_lookup(const char *, unsigned, struct nameidata
*);
74 extern int vfs_path_lookup(struct dentry
*, struct vfsmount
*,
75 const char *, unsigned int, struct nameidata
*);
77 extern struct file
*lookup_instantiate_filp(struct nameidata
*nd
, struct dentry
*dentry
,
78 int (*open
)(struct inode
*, struct file
*));
80 extern struct dentry
*lookup_one_len(const char *, struct dentry
*, int);
82 extern int follow_down(struct path
*);
83 extern int follow_up(struct path
*);
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 static inline void nd_terminate_link(void *name
, size_t len
, size_t maxlen
)
100 ((char *) name
)[min(len
, maxlen
)] = '\0';
103 #endif /* _LINUX_NAMEI_H */
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