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TOMOYO Linux Cross Reference
Linux/include/linux/dcookies.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * dcookies.h
  4  *
  5  * Persistent cookie-path mappings
  6  *
  7  * Copyright 2002 John Levon <levon@movementarian.org>
  8  */
  9 
 10 #ifndef DCOOKIES_H
 11 #define DCOOKIES_H
 12  
 13 
 14 #ifdef CONFIG_PROFILING
 15  
 16 #include <linux/dcache.h>
 17 #include <linux/types.h>
 18  
 19 struct dcookie_user;
 20 struct path;
 21  
 22 /**
 23  * dcookie_register - register a user of dcookies
 24  *
 25  * Register as a dcookie user. Returns %NULL on failure.
 26  */
 27 struct dcookie_user * dcookie_register(void);
 28 
 29 /**
 30  * dcookie_unregister - unregister a user of dcookies
 31  *
 32  * Unregister as a dcookie user. This may invalidate
 33  * any dcookie values returned from get_dcookie().
 34  */
 35 void dcookie_unregister(struct dcookie_user * user);
 36   
 37 /**
 38  * get_dcookie - acquire a dcookie
 39  *
 40  * Convert the given dentry/vfsmount pair into
 41  * a cookie value.
 42  *
 43  * Returns -EINVAL if no living task has registered as a
 44  * dcookie user.
 45  *
 46  * Returns 0 on success, with *cookie filled in
 47  */
 48 int get_dcookie(const struct path *path, unsigned long *cookie);
 49 
 50 #else
 51 
 52 static inline struct dcookie_user * dcookie_register(void)
 53 {
 54         return NULL;
 55 }
 56 
 57 static inline void dcookie_unregister(struct dcookie_user * user)
 58 {
 59         return;
 60 }
 61 
 62 static inline int get_dcookie(const struct path *path, unsigned long *cookie)
 63 {
 64         return -ENOSYS;
 65 }
 66 
 67 #endif /* CONFIG_PROFILING */
 68 
 69 #endif /* DCOOKIES_H */
 70 

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