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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - include/linux/namei.h
1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/kernel.h>
6 #include <linux/path.h>
7 #include <linux/fcntl.h>
8 #include <linux/errno.h>
10 enum { MAX_NESTED_LINKS
= 8 };
12 #define MAXSYMLINKS 40
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 * - don't fetch xattrs on audit_inode
30 #define LOOKUP_FOLLOW 0x0001
31 #define LOOKUP_DIRECTORY 0x0002
32 #define LOOKUP_AUTOMOUNT 0x0004
34 #define LOOKUP_PARENT 0x0010
35 #define LOOKUP_REVAL 0x0020
36 #define LOOKUP_RCU 0x0040
37 #define LOOKUP_NO_REVAL 0x0080
38 #define LOOKUP_NO_EVAL 0x0100
43 #define LOOKUP_OPEN 0x0100
44 #define LOOKUP_CREATE 0x0200
45 #define LOOKUP_EXCL 0x0400
46 #define LOOKUP_RENAME_TARGET 0x0800
48 #define LOOKUP_JUMPED 0x1000
49 #define LOOKUP_ROOT 0x2000
50 #define LOOKUP_EMPTY 0x4000
51 #define LOOKUP_DOWN 0x8000
53 extern int path_pts(struct path
*path
);
55 extern int user_path_at_empty(int, const char __user
*, unsigned, struct path
*, int *empty
);
57 static inline int user_path_at(int dfd
, const char __user
*name
, unsigned flags
,
60 return user_path_at_empty(dfd
, name
, flags
, path
, NULL
);
63 static inline int user_path(const char __user
*name
, struct path
*path
)
65 return user_path_at_empty(AT_FDCWD
, name
, LOOKUP_FOLLOW
, path
, NULL
);
68 static inline int user_lpath(const char __user
*name
, struct path
*path
)
70 return user_path_at_empty(AT_FDCWD
, name
, 0, path
, NULL
);
73 static inline int user_path_dir(const char __user
*name
, struct path
*path
)
75 return user_path_at_empty(AT_FDCWD
, name
,
76 LOOKUP_FOLLOW
| LOOKUP_DIRECTORY
, path
, NULL
);
79 extern int kern_path(const char *, unsigned, struct path
*);
81 extern struct dentry
*kern_path_create(int, const char *, struct path
*, unsigned int);
82 extern struct dentry
*user_path_create(int, const char __user
*, struct path
*, unsigned int);
83 extern void done_path_create(struct path
*, struct dentry
*);
84 extern struct dentry
*kern_path_locked(const char *, struct path
*);
85 extern int kern_path_mountpoint(int, const char *, struct path
*, unsigned int);
87 extern struct dentry
*try_lookup_one_len(const char *, struct dentry
*, int);
88 extern struct dentry
*lookup_one_len(const char *, struct dentry
*, int);
89 extern struct dentry
*lookup_one_len_unlocked(const char *, struct dentry
*, int);
91 extern int follow_down_one(struct path
*);
92 extern int follow_down(struct path
*);
93 extern int follow_up(struct path
*);
95 extern struct dentry
*lock_rename(struct dentry
*, struct dentry
*);
96 extern void unlock_rename(struct dentry
*, struct dentry
*);
98 extern void nd_jump_link(struct path
*path
);
100 static inline void nd_terminate_link(void *name
, size_t len
, size_t maxlen
)
102 ((char *) name
)[min(len
, maxlen
)] = '\0';
106 * retry_estale - determine whether the caller should retry an operation
107 * @error: the error that would currently be returned
108 * @flags: flags being used for next lookup attempt
110 * Check to see if the error code was -ESTALE, and then determine whether
111 * to retry the call based on whether "flags" already has LOOKUP_REVAL set.
113 * Returns true if the caller should try the operation again.
116 retry_estale(const long error
, const unsigned int flags
)
118 return error
== -ESTALE
&& !(flags
& LOOKUP_REVAL
);
121 #endif /* _LINUX_NAMEI_H */