1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#ifndef _NFS4_DRC_H
27#define	_NFS4_DRC_H
28
29#pragma ident	"%Z%%M%	%I%	%E% SMI"
30
31#ifdef	__cplusplus
32extern "C" {
33#endif
34
35/*
36 * NFSv4 Duplicate Request cache.
37 */
38typedef struct rfs4_drc {
39	kmutex_t 	lock;
40	uint32_t	dr_hash;
41	uint32_t 	max_size;
42	uint32_t 	in_use;
43	list_t		dr_cache;
44	list_t  	*dr_buckets;
45} rfs4_drc_t;
46
47/*
48 * NFSv4 Duplicate request cache entry.
49 */
50typedef struct rfs4_dupreq {
51	list_node_t 	dr_bkt_next;
52	list_node_t	dr_next;
53	list_t		*dr_bkt;
54	rfs4_drc_t	*drc;
55	int		dr_state;
56	uint32_t	dr_xid;
57	struct netbuf	dr_addr;
58	COMPOUND4res 	dr_res;
59} rfs4_dupreq_t;
60
61/*
62 *  State of rfs4_dupreq.
63 */
64#define	NFS4_DUP_ERROR		-1
65#define	NFS4_NOT_DUP		0
66#define	NFS4_DUP_NEW		1
67#define	NFS4_DUP_PENDING	2
68#define	NFS4_DUP_FREE		3
69
70#define	NFS4_DUP_REPLAY 	4
71#define	NFS4_DUP_INUSE		5
72
73extern rfs4_drc_t *nfs4_drc;
74extern uint32_t nfs4_drc_max;
75extern uint32_t nfs4_drc_hash;
76
77rfs4_drc_t *rfs4_init_drc(uint32_t, uint32_t);
78void rfs4_fini_drc(rfs4_drc_t *);
79void rfs4_dr_chstate(rfs4_dupreq_t *, int);
80rfs4_dupreq_t *rfs4_alloc_dr(rfs4_drc_t *);
81int rfs4_find_dr(struct svc_req *, rfs4_drc_t *, rfs4_dupreq_t **);
82
83#ifdef	__cplusplus
84}
85#endif
86
87#endif /* _NFS4_DRC_H */
88