?? user-type.h
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/* user-type.h: User-defined key type * * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */#ifndef _KEYS_USER_TYPE_H#define _KEYS_USER_TYPE_H#include <linux/key.h>#include <linux/rcupdate.h>/*****************************************************************************//* * the payload for a key of type "user" * - once filled in and attached to a key: * - the payload struct is invariant may not be changed, only replaced * - the payload must be read with RCU procedures or with the key semaphore * held * - the payload may only be replaced with the key semaphore write-locked * - the key's data length is the size of the actual data, not including the * payload wrapper */struct user_key_payload { struct rcu_head rcu; /* RCU destructor */ unsigned short datalen; /* length of this data */ char data[0]; /* actual data */};extern struct key_type key_type_user;extern int user_instantiate(struct key *key, const void *data, size_t datalen);extern int user_update(struct key *key, const void *data, size_t datalen);extern int user_match(const struct key *key, const void *criterion);extern void user_revoke(struct key *key);extern void user_destroy(struct key *key);extern void user_describe(const struct key *user, struct seq_file *m);extern long user_read(const struct key *key, char __user *buffer, size_t buflen);#endif /* _KEYS_USER_TYPE_H */
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