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