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/*-
* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
* Authors: Doug Rabson <dfr@rabson.org>
* Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: release/9.1.0/sys/rpc/replay.h 184588 2008-11-03 10:38:00Z dfr $
*/
#ifndef _RPC_REPLAY_H
#define _RPC_REPLAY_H
enum replay_state {
RS_NEW, /* new request - caller should execute */
RS_DONE, /* request was executed and reply sent */
RS_INPROGRESS, /* request is being executed now */
RS_ERROR /* allocation or other failure */
};
struct replay_cache;
/*
* Create a new replay cache.
*/
struct replay_cache *replay_newcache(size_t);
/*
* Set the replay cache size.
*/
void replay_setsize(struct replay_cache *, size_t);
/*
* Free a replay cache. Caller must ensure that no cache entries are
* in-progress.
*/
void replay_freecache(struct replay_cache *rc);
/*
* Check a replay cache for a message from a given address.
*
* If this is a new request, RS_NEW is returned. Caller should call
* replay_setreply with the results of the request.
*
* If this is a request which is currently executing
* (i.e. replay_setreply hasn't been called for it yet), RS_INPROGRESS
* is returned. The caller should silently drop the request.
*
* If a reply to this message already exists, *repmsg and *mp are set
* to point at the reply and, RS_DONE is returned. The caller should
* re-send this reply.
*
* If the attempt to update the replay cache or copy a replay failed
* for some reason (typically memory shortage), RS_ERROR is returned.
*/
enum replay_state replay_find(struct replay_cache *rc,
struct rpc_msg *msg, struct sockaddr *addr,
struct rpc_msg *repmsg, struct mbuf **mp);
/*
* Call this after executing a request to record the reply.
*/
void replay_setreply(struct replay_cache *rc,
struct rpc_msg *repmsg, struct sockaddr *addr, struct mbuf *m);
#endif /* !_RPC_REPLAY_H */