[mirror_ubuntu-bionic-kernel.git] / include / linux / dcookies.h

/*
 * dcookies.h
 *
 * Persistent cookie-path mappings
 *
 * Copyright 2002 John Levon <levon@movementarian.org>
 */

#ifndef DCOOKIES_H
#define DCOOKIES_H
 
#include <linux/config.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

struct dcookie_user * dcookie_register(void)
{
	return NULL;
}

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