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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - include/linux/namei.h
4 #include <linux/dcache.h>
5 #include <linux/linkage.h>
6 #include <linux/path.h>
10 enum { MAX_NESTED_LINKS
= 8 };
16 struct inode
*inode
; /* path.dentry.d_inode */
21 char *saved_names
[MAX_NESTED_LINKS
+ 1];
25 * Type of the last component on LOOKUP_PARENT
27 enum {LAST_NORM
, LAST_ROOT
, LAST_DOT
, LAST_DOTDOT
, LAST_BIND
};
30 * The bitmask for a lookup event:
31 * - follow links at the end
32 * - require a directory
33 * - ending slashes ok even for nonexistent files
34 * - internal "there are more path components" flag
35 * - dentry cache is untrusted; force a real lookup
36 * - suppress terminal automount
38 #define LOOKUP_FOLLOW 0x0001
39 #define LOOKUP_DIRECTORY 0x0002
40 #define LOOKUP_AUTOMOUNT 0x0004
42 #define LOOKUP_PARENT 0x0010
43 #define LOOKUP_REVAL 0x0020
44 #define LOOKUP_RCU 0x0040
49 #define LOOKUP_OPEN 0x0100
50 #define LOOKUP_CREATE 0x0200
51 #define LOOKUP_EXCL 0x0400
52 #define LOOKUP_RENAME_TARGET 0x0800
54 #define LOOKUP_JUMPED 0x1000
55 #define LOOKUP_ROOT 0x2000
56 #define LOOKUP_EMPTY 0x4000
58 extern int user_path_at(int, const char __user
*, unsigned, struct path
*);
59 extern int user_path_at_empty(int, const char __user
*, unsigned, struct path
*, int *empty
);
61 #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path)
62 #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path)
63 #define user_path_dir(name, path) \
64 user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path)
66 extern int kern_path(const char *, unsigned, struct path
*);
68 extern struct dentry
*kern_path_create(int, const char *, struct path
*, unsigned int);
69 extern struct dentry
*user_path_create(int, const char __user
*, struct path
*, unsigned int);
70 extern void done_path_create(struct path
*, struct dentry
*);
71 extern struct dentry
*kern_path_locked(const char *, struct path
*);
72 extern int vfs_path_lookup(struct dentry
*, struct vfsmount
*,
73 const char *, unsigned int, struct path
*);
75 extern struct dentry
*lookup_one_len(const char *, struct dentry
*, int);
77 extern int follow_down_one(struct path
*);
78 extern int follow_down(struct path
*);
79 extern int follow_up(struct path
*);
81 extern struct dentry
*lock_rename(struct dentry
*, struct dentry
*);
82 extern void unlock_rename(struct dentry
*, struct dentry
*);
84 extern void nd_jump_link(struct nameidata
*nd
, struct path
*path
);
86 static inline void nd_set_link(struct nameidata
*nd
, char *path
)
88 nd
->saved_names
[nd
->depth
] = path
;
91 static inline char *nd_get_link(struct nameidata
*nd
)
93 return nd
->saved_names
[nd
->depth
];
96 static inline void nd_terminate_link(void *name
, size_t len
, size_t maxlen
)
98 ((char *) name
)[min(len
, maxlen
)] = '\0';
102 * retry_estale - determine whether the caller should retry an operation
103 * @error: the error that would currently be returned
104 * @flags: flags being used for next lookup attempt
106 * Check to see if the error code was -ESTALE, and then determine whether
107 * to retry the call based on whether "flags" already has LOOKUP_REVAL set.
109 * Returns true if the caller should try the operation again.
112 retry_estale(const long error
, const unsigned int flags
)
114 return error
== -ESTALE
&& !(flags
& LOOKUP_REVAL
);
117 #endif /* _LINUX_NAMEI_H */