linux/include/keys/keyring-type.h
David Howells 233e4735f2 KEYS: Permit in-place link replacement in keyring list
Make use of the previous patch that makes the garbage collector perform RCU
synchronisation before destroying defunct keys.  Key pointers can now be
replaced in-place without creating a new keyring payload and replacing the
whole thing as the discarded keys will not be destroyed until all currently
held RCU read locks are released.

If the keyring payload space needs to be expanded or contracted, then a
replacement will still need allocating, and the original will still have to be
freed by RCU.

Signed-off-by: David Howells <dhowells@redhat.com>
2012-05-11 10:56:56 +01:00

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C

/* Keyring key type
*
* Copyright (C) 2008 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_KEYRING_TYPE_H
#define _KEYS_KEYRING_TYPE_H
#include <linux/key.h>
#include <linux/rcupdate.h>
/*
* the keyring payload contains a list of the keys to which the keyring is
* subscribed
*/
struct keyring_list {
struct rcu_head rcu; /* RCU deletion hook */
unsigned short maxkeys; /* max keys this list can hold */
unsigned short nkeys; /* number of keys currently held */
unsigned short delkey; /* key to be unlinked by RCU */
struct key __rcu *keys[0];
};
#endif /* _KEYS_KEYRING_TYPE_H */