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/*

 * dcookies.h

 *

 * Persistent cookie-path mappings

 *

 * Copyright 2002 John Levon <levon@movementarian.org>

 */

#ifndef DCOOKIES_H

#define DCOOKIES_H

#ifdef CONFIG_PROFILING

#include <linux/dcache.h>

#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 */