diff options
Diffstat (limited to 'include')
-rw-r--r-- | include/keys/user-type.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/include/keys/user-type.h b/include/keys/user-type.h new file mode 100644 index 0000000..26f6ec3 --- /dev/null +++ b/include/keys/user-type.h @@ -0,0 +1,47 @@ +/* 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_duplicate(struct key *key, const struct key *source); +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_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 */ |