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422 giacomo 1 
/*
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 * dcookies.h
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 *
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 * Persistent cookie-path mappings
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 *
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 * Copyright 2002 John Levon <levon@movementarian.org>
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 */
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#ifndef DCOOKIES_H
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#define DCOOKIES_H
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#include <linux/config.h>
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#ifdef CONFIG_PROFILING
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#include <linux/types.h>
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struct dcookie_user;
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/**
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 * dcookie_register - register a user of dcookies
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 *
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 * Register as a dcookie user. Returns %NULL on failure.
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 */
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struct dcookie_user * dcookie_register(void);
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/**
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 * dcookie_unregister - unregister a user of dcookies
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 *
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 * Unregister as a dcookie user. This may invalidate
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 * any dcookie values returned from get_dcookie().
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 */
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void dcookie_unregister(struct dcookie_user * user);
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/**
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 * get_dcookie - acquire a dcookie
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 *
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 * Convert the given dentry/vfsmount pair into
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 * a cookie value.
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 *
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 * Returns -EINVAL if no living task has registered as a
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 * dcookie user.
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 *
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 * Returns 0 on success, with *cookie filled in
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 */
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int get_dcookie(struct dentry * dentry, struct vfsmount * vfsmnt,
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        unsigned long * cookie);
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#else
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struct dcookie_user * dcookie_register(void)
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{
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        return 0;
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}
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void dcookie_unregister(struct dcookie_user * user)
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{
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        return;
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}
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static inline int get_dcookie(struct dentry * dentry,
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        struct vfsmount * vfsmnt, unsigned long * cookie)
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{
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        return -ENOSYS;
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}
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#endif /* CONFIG_PROFILING */
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#endif /* DCOOKIES_H */