mirror of https://gitee.com/openkylin/linux.git
69 lines
1.2 KiB
C
69 lines
1.2 KiB
C
/*
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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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#ifdef CONFIG_PROFILING
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#include <linux/dcache.h>
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#include <linux/types.h>
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struct dcookie_user;
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struct path;
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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 path *path, unsigned long *cookie);
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#else
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static inline struct dcookie_user * dcookie_register(void)
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{
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return NULL;
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}
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static inline 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 path *path, 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 */
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