FreeBSD/Linux Kernel Cross Reference
sys/rpc/replay.h
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
5 * Authors: Doug Rabson <dfr@rabson.org>
6 * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31
32 #ifndef _RPC_REPLAY_H
33 #define _RPC_REPLAY_H
34
35 enum replay_state {
36 RS_NEW, /* new request - caller should execute */
37 RS_DONE, /* request was executed and reply sent */
38 RS_INPROGRESS, /* request is being executed now */
39 RS_ERROR /* allocation or other failure */
40 };
41
42 struct replay_cache;
43
44 /*
45 * Create a new replay cache.
46 */
47 struct replay_cache *replay_newcache(size_t);
48
49 /*
50 * Set the replay cache size.
51 */
52 void replay_setsize(struct replay_cache *, size_t);
53
54 /*
55 * Free a replay cache. Caller must ensure that no cache entries are
56 * in-progress.
57 */
58 void replay_freecache(struct replay_cache *rc);
59
60 /*
61 * Check a replay cache for a message from a given address.
62 *
63 * If this is a new request, RS_NEW is returned. Caller should call
64 * replay_setreply with the results of the request.
65 *
66 * If this is a request which is currently executing
67 * (i.e. replay_setreply hasn't been called for it yet), RS_INPROGRESS
68 * is returned. The caller should silently drop the request.
69 *
70 * If a reply to this message already exists, *repmsg and *mp are set
71 * to point at the reply and, RS_DONE is returned. The caller should
72 * re-send this reply.
73 *
74 * If the attempt to update the replay cache or copy a replay failed
75 * for some reason (typically memory shortage), RS_ERROR is returned.
76 */
77 enum replay_state replay_find(struct replay_cache *rc,
78 struct rpc_msg *msg, struct sockaddr *addr,
79 struct rpc_msg *repmsg, struct mbuf **mp);
80
81 /*
82 * Call this after executing a request to record the reply.
83 */
84 void replay_setreply(struct replay_cache *rc,
85 struct rpc_msg *repmsg, struct sockaddr *addr, struct mbuf *m);
86
87 #endif /* !_RPC_REPLAY_H */
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