dcookies.h
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上传日期:2009-04-28
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文件大小:1k
- /*
- * 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
- 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 */