/* * dcookies.h * * Persistent cookie-path mappings * * Copyright 2002 John Levon <levon@movementarian.org> */ #ifndef DCOOKIES_H#define DCOOKIES_H  #ifdef CONFIG_PROFILING #include <linux/types.h> struct dcookie_user; /** * dcookie_register - register a user of dcookies * * Register as a dcookie user. Returns %NULL on failure. */struct dcookie_user * dcookie_register(void); /** * dcookie_unregister - unregister a user of dcookies * * Unregister as a dcookie user. This may invalidate * any dcookie values returned from get_dcookie(). */void dcookie_unregister(struct dcookie_user * user);  /** * get_dcookie - acquire a dcookie * * Convert the given dentry/vfsmount pair into * a cookie value. * * Returns -EINVAL if no living task has registered as a * dcookie user. * * Returns 0 on success, with *cookie filled in */int get_dcookie(struct dentry * dentry, struct vfsmount * vfsmnt,	unsigned long * cookie); #else static inline struct dcookie_user * dcookie_register(void){	return NULL;} static inline void dcookie_unregister(struct dcookie_user * user){	return;} static inline int get_dcookie(struct dentry * dentry,	struct vfsmount * vfsmnt, unsigned long * cookie){	return -ENOSYS;}  #endif /* CONFIG_PROFILING */ #endif /* DCOOKIES_H */