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1 | #ifndef _LINUX_NAMEI_H |
2 | #define _LINUX_NAMEI_H |
3 | |
4 | #include <linux/dcache.h> |
5 | #include <linux/errno.h> |
6 | #include <linux/linkage.h> |
7 | #include <linux/path.h> |
8 | |
9 | struct vfsmount; |
10 | |
11 | enum { MAX_NESTED_LINKS = 8 }; |
12 | |
13 | struct nameidata { |
14 | struct path path; |
15 | struct qstr last; |
16 | struct path root; |
17 | struct inode *inode; /* path.dentry.d_inode */ |
18 | unsigned int flags; |
19 | unsigned seq; |
20 | int last_type; |
21 | unsigned depth; |
22 | char *saved_names[MAX_NESTED_LINKS + 1]; |
23 | }; |
24 | |
25 | /* |
26 | * Type of the last component on LOOKUP_PARENT |
27 | */ |
28 | enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND}; |
29 | |
30 | /* |
31 | * The bitmask for a lookup event: |
32 | * - follow links at the end |
33 | * - require a directory |
34 | * - ending slashes ok even for nonexistent files |
35 | * - internal "there are more path components" flag |
36 | * - dentry cache is untrusted; force a real lookup |
37 | * - suppress terminal automount |
38 | */ |
39 | #define LOOKUP_FOLLOW 0x0001 |
40 | #define LOOKUP_DIRECTORY 0x0002 |
41 | #define LOOKUP_AUTOMOUNT 0x0004 |
42 | |
43 | #define LOOKUP_PARENT 0x0010 |
44 | #define LOOKUP_REVAL 0x0020 |
45 | #define LOOKUP_RCU 0x0040 |
46 | |
47 | /* |
48 | * Intent data |
49 | */ |
50 | #define LOOKUP_OPEN 0x0100 |
51 | #define LOOKUP_CREATE 0x0200 |
52 | #define LOOKUP_EXCL 0x0400 |
53 | #define LOOKUP_RENAME_TARGET 0x0800 |
54 | |
55 | #define LOOKUP_JUMPED 0x1000 |
56 | #define LOOKUP_ROOT 0x2000 |
57 | #define LOOKUP_EMPTY 0x4000 |
58 | |
59 | extern int user_path_at(int, const char __user *, unsigned, struct path *); |
60 | extern int user_path_at_empty(int, const char __user *, unsigned, struct path *, int *empty); |
61 | |
62 | #define user_path(name, path) user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW, path) |
63 | #define user_lpath(name, path) user_path_at(AT_FDCWD, name, 0, path) |
64 | #define user_path_dir(name, path) \ |
65 | user_path_at(AT_FDCWD, name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, path) |
66 | |
67 | extern int kern_path(const char *, unsigned, struct path *); |
68 | |
69 | extern struct dentry *kern_path_create(int, const char *, struct path *, unsigned int); |
70 | extern struct dentry *user_path_create(int, const char __user *, struct path *, unsigned int); |
71 | extern void done_path_create(struct path *, struct dentry *); |
72 | extern struct dentry *kern_path_locked(const char *, struct path *); |
73 | extern int kern_path_mountpoint(int, const char *, struct path *, unsigned int); |
74 | |
75 | extern struct dentry *lookup_one_len(const char *, struct dentry *, int); |
76 | |
77 | extern int follow_down_one(struct path *); |
78 | extern int follow_down(struct path *); |
79 | extern int follow_up(struct path *); |
80 | |
81 | extern struct dentry *lock_rename(struct dentry *, struct dentry *); |
82 | extern void unlock_rename(struct dentry *, struct dentry *); |
83 | |
84 | extern void nd_jump_link(struct nameidata *nd, struct path *path); |
85 | |
86 | static inline void nd_set_link(struct nameidata *nd, char *path) |
87 | { |
88 | nd->saved_names[nd->depth] = path; |
89 | } |
90 | |
91 | static inline char *nd_get_link(struct nameidata *nd) |
92 | { |
93 | return nd->saved_names[nd->depth]; |
94 | } |
95 | |
96 | static inline void nd_terminate_link(void *name, size_t len, size_t maxlen) |
97 | { |
98 | ((char *) name)[min(len, maxlen)] = '\0'; |
99 | } |
100 | |
101 | /** |
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 |
105 | * |
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. |
108 | * |
109 | * Returns true if the caller should try the operation again. |
110 | */ |
111 | static inline bool |
112 | retry_estale(const long error, const unsigned int flags) |
113 | { |
114 | return error == -ESTALE && !(flags & LOOKUP_REVAL); |
115 | } |
116 | |
117 | #endif /* _LINUX_NAMEI_H */ |
118 |
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