[net-next-2.6.git] / include / linux / dcookies.h

/*
 * 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 */
Commit	Line	Data
1da177e4 LT	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
1da177e4 LT	12
	13	#ifdef CONFIG_PROFILING
	14
	15	#include <linux/types.h>
	16
	17	struct dcookie_user;
	18
	19	/**
	20	* dcookie_register - register a user of dcookies
	21	*
	22	* Register as a dcookie user. Returns %NULL on failure.
	23	*/
	24	struct dcookie_user * dcookie_register(void);
	25
	26	/**
	27	* dcookie_unregister - unregister a user of dcookies
	28	*
	29	* Unregister as a dcookie user. This may invalidate
	30	* any dcookie values returned from get_dcookie().
	31	*/
	32	void dcookie_unregister(struct dcookie_user * user);
	33
	34	/**
	35	* get_dcookie - acquire a dcookie
	36	*
	37	* Convert the given dentry/vfsmount pair into
	38	* a cookie value.
	39	*
	40	* Returns -EINVAL if no living task has registered as a
	41	* dcookie user.
	42	*
	43	* Returns 0 on success, with *cookie filled in
	44	*/
	45	int get_dcookie(struct dentry * dentry, struct vfsmount * vfsmnt,
	46	unsigned long * cookie);
	47
	48	#else
	49
0072b138	50	static inline struct dcookie_user * dcookie_register(void)
1da177e4 LT	51	{
	52	return NULL;
	53	}
	54
0072b138	55	static inline void dcookie_unregister(struct dcookie_user * user)
1da177e4 LT	56	{
	57	return;
	58	}
	59
	60	static inline int get_dcookie(struct dentry * dentry,
	61	struct vfsmount * vfsmnt, unsigned long * cookie)
	62	{
	63	return -ENOSYS;
	64	}
	65
	66	#endif /* CONFIG_PROFILING */
	67
	68	#endif /* DCOOKIES_H */