| 1 | |
| 2 | * dcookies.h
|
| 3 | *
|
| 4 | * Persistent cookie-path mappings
|
| 5 | *
|
| 6 | * Copyright 2002 John Levon <[email protected]>
|
| 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/types.h>
|
| 17 |
|
| 18 | struct dcookie_user;
|
| 19 | struct path;
|
| 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
|
| 67 |
|
| 68 | #endif
|