4 #include <linux/dcache.h>
5 #include <linux/errno.h>
6 #include <linux/linkage.h>
7 #include <linux/path.h>
12 enum { MAX_NESTED_LINKS
= 8 };
15 * Type of the last component on LOOKUP_PARENT
17 enum {LAST_NORM
, LAST_ROOT
, LAST_DOT
, LAST_DOTDOT
, LAST_BIND
};
20 * The bitmask for a lookup event:
21 * - follow links at the end
22 * - require a directory
23 * - ending slashes ok even for nonexistent files
24 * - internal "there are more path components" flag
25 * - dentry cache is untrusted; force a real lookup
26 * - suppress terminal automount
28 #define LOOKUP_FOLLOW 0x0001
29 #define LOOKUP_DIRECTORY 0x0002
30 #define LOOKUP_AUTOMOUNT 0x0004
32 #define LOOKUP_PARENT 0x0010
33 #define LOOKUP_REVAL 0x0020
34 #define LOOKUP_RCU 0x0040
39 #define LOOKUP_OPEN 0x0100
40 #define LOOKUP_CREATE 0x0200
41 #define LOOKUP_EXCL 0x0400
42 #define LOOKUP_RENAME_TARGET 0x0800
44 #define LOOKUP_JUMPED 0x1000
45 #define LOOKUP_ROOT 0x2000
46 #define LOOKUP_EMPTY 0x4000
48 extern int user_path_at(int, const char __user
*, unsigned, struct path
*);
49 extern int user_path_at_empty(int, const char __user
*, unsigned, struct path
*, int *empty
);
51 #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path)
52 #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path)
53 #define user_path_dir(name, path) \
54 user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path)
56 extern int kern_path(const char *, unsigned, struct path
*);
58 extern struct dentry
*kern_path_create(int, const char *, struct path
*, unsigned int);
59 extern struct dentry
*user_path_create(int, const char __user
*, struct path
*, unsigned int);
60 extern void done_path_create(struct path
*, struct dentry
*);
61 extern struct dentry
*kern_path_locked(const char *, struct path
*);
62 extern int kern_path_mountpoint(int, const char *, struct path
*, unsigned int);
64 extern struct dentry
*lookup_one_len(const char *, struct dentry
*, int);
66 extern int follow_down_one(struct path
*);
67 extern int follow_down(struct path
*);
68 extern int follow_up(struct path
*);
70 extern struct dentry
*lock_rename(struct dentry
*, struct dentry
*);
71 extern void unlock_rename(struct dentry
*, struct dentry
*);
73 extern void nd_jump_link(struct nameidata
*nd
, struct path
*path
);
74 extern void nd_set_link(struct nameidata
*nd
, char *path
);
75 extern char *nd_get_link(struct nameidata
*nd
);
77 static inline void nd_terminate_link(void *name
, size_t len
, size_t maxlen
)
79 ((char *) name
)[min(len
, maxlen
)] = '\0';
83 * retry_estale - determine whether the caller should retry an operation
84 * @error: the error that would currently be returned
85 * @flags: flags being used for next lookup attempt
87 * Check to see if the error code was -ESTALE, and then determine whether
88 * to retry the call based on whether "flags" already has LOOKUP_REVAL set.
90 * Returns true if the caller should try the operation again.
93 retry_estale(const long error
, const unsigned int flags
)
95 return error
== -ESTALE
&& !(flags
& LOOKUP_REVAL
);
98 #endif /* _LINUX_NAMEI_H */