4 #include <linux/dcache.h>
5 #include <linux/linkage.h>
6 #include <linux/path.h>
16 enum { MAX_NESTED_LINKS
= 8 };
22 struct inode
*inode
; /* path.dentry.d_inode */
27 char *saved_names
[MAX_NESTED_LINKS
+ 1];
31 struct open_intent open
;
36 * Type of the last component on LOOKUP_PARENT
38 enum {LAST_NORM
, LAST_ROOT
, LAST_DOT
, LAST_DOTDOT
, LAST_BIND
};
41 * The bitmask for a lookup event:
42 * - follow links at the end
43 * - require a directory
44 * - ending slashes ok even for nonexistent files
45 * - internal "there are more path components" flag
46 * - dentry cache is untrusted; force a real lookup
47 * - suppress terminal automount
49 #define LOOKUP_FOLLOW 0x0001
50 #define LOOKUP_DIRECTORY 0x0002
51 #define LOOKUP_AUTOMOUNT 0x0004
53 #define LOOKUP_PARENT 0x0010
54 #define LOOKUP_REVAL 0x0020
55 #define LOOKUP_RCU 0x0040
60 #define LOOKUP_OPEN 0x0100
61 #define LOOKUP_CREATE 0x0200
62 #define LOOKUP_EXCL 0x0400
63 #define LOOKUP_RENAME_TARGET 0x0800
65 #define LOOKUP_JUMPED 0x1000
66 #define LOOKUP_ROOT 0x2000
67 #define LOOKUP_EMPTY 0x4000
69 extern int user_path_at(int, const char __user
*, unsigned, struct path
*);
70 extern int user_path_at_empty(int, const char __user
*, unsigned, struct path
*, int *empty
);
72 #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path)
73 #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path)
74 #define user_path_dir(name, path) \
75 user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path)
77 extern int kern_path(const char *, unsigned, struct path
*);
79 extern struct dentry
*kern_path_create(int, const char *, struct path
*, int);
80 extern struct dentry
*user_path_create(int, const char __user
*, struct path
*, int);
81 extern int kern_path_parent(const char *, struct nameidata
*);
82 extern int vfs_path_lookup(struct dentry
*, struct vfsmount
*,
83 const char *, unsigned int, struct path
*);
85 extern struct file
*lookup_instantiate_filp(struct nameidata
*nd
, struct dentry
*dentry
,
86 int (*open
)(struct inode
*, struct file
*));
88 extern struct dentry
*lookup_one_len(const char *, struct dentry
*, int);
90 extern int follow_down_one(struct path
*);
91 extern int follow_down(struct path
*);
92 extern int follow_up(struct path
*);
94 extern struct dentry
*lock_rename(struct dentry
*, struct dentry
*);
95 extern void unlock_rename(struct dentry
*, struct dentry
*);
97 static inline void nd_set_link(struct nameidata
*nd
, char *path
)
99 nd
->saved_names
[nd
->depth
] = path
;
102 static inline char *nd_get_link(struct nameidata
*nd
)
104 return nd
->saved_names
[nd
->depth
];
107 static inline void nd_terminate_link(void *name
, size_t len
, size_t maxlen
)
109 ((char *) name
)[min(len
, maxlen
)] = '\0';
112 #endif /* _LINUX_NAMEI_H */
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