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1 | /* |
2 | * dcookies.h |
3 | * |
4 | * Persistent cookie-path mappings |
5 | * |
6 | * Copyright 2002 John Levon <levon@movementarian.org> |
7 | */ |
8 | |
9 | #ifndef DCOOKIES_H |
10 | #define DCOOKIES_H |
11 | |
12 | |
13 | #ifdef CONFIG_PROFILING |
14 | |
15 | #include <linux/dcache.h> |
16 | #include <linux/path.h> |
17 | #include <linux/types.h> |
18 | |
19 | struct dcookie_user; |
20 | |
21 | /** |
22 | * dcookie_register - register a user of dcookies |
23 | * |
24 | * Register as a dcookie user. Returns %NULL on failure. |
25 | */ |
26 | struct dcookie_user * dcookie_register(void); |
27 | |
28 | /** |
29 | * dcookie_unregister - unregister a user of dcookies |
30 | * |
31 | * Unregister as a dcookie user. This may invalidate |
32 | * any dcookie values returned from get_dcookie(). |
33 | */ |
34 | void dcookie_unregister(struct dcookie_user * user); |
35 | |
36 | /** |
37 | * get_dcookie - acquire a dcookie |
38 | * |
39 | * Convert the given dentry/vfsmount pair into |
40 | * a cookie value. |
41 | * |
42 | * Returns -EINVAL if no living task has registered as a |
43 | * dcookie user. |
44 | * |
45 | * Returns 0 on success, with *cookie filled in |
46 | */ |
47 | int get_dcookie(struct path *path, unsigned long *cookie); |
48 | |
49 | #else |
50 | |
51 | static inline struct dcookie_user * dcookie_register(void) |
52 | { |
53 | return NULL; |
54 | } |
55 | |
56 | static inline void dcookie_unregister(struct dcookie_user * user) |
57 | { |
58 | return; |
59 | } |
60 | |
61 | static inline int get_dcookie(struct path *path, unsigned long *cookie) |
62 | { |
63 | return -ENOSYS; |
64 | } |
65 | |
66 | #endif /* CONFIG_PROFILING */ |
67 | |
68 | #endif /* DCOOKIES_H */ |
69 |
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