/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License, Version 1.0 only

 * (the "License").  You may not use this file except in compliance

 * with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

#ifndef _NFS4_DRC_H

#define	_NFS4_DRC_H

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#ifdef	__cplusplus

extern "C" {

#endif

/*

 * NFSv4 Duplicate Request cache.

 */

typedef struct rfs4_drc {

	kmutex_t 	lock;

	uint32_t	dr_hash;

	uint32_t 	max_size;

	uint32_t 	in_use;

	unsigned	drc_ttl;

	list_t		dr_cache;

	list_t  	*dr_buckets;

} rfs4_drc_t;

/*

 * NFSv4 Duplicate request cache entry.

 */

typedef struct rfs4_dupreq {

	list_node_t 	dr_bkt_next;

	list_node_t	dr_next;

	list_t		*dr_bkt;

	rfs4_drc_t	*drc;

	int		dr_state;

	timestruc_t 	dr_time_created;

	timestruc_t 	dr_time_used;

	uint32_t	dr_xid;

	struct netbuf	dr_addr;

	COMPOUND4res 	dr_res;

} rfs4_dupreq_t;

/*

 *  State of rfs4_dupreq.

 */

#define	NFS4_DUP_ERROR		-1

#define	NFS4_NOT_DUP		0

#define	NFS4_DUP_NEW		1

#define	NFS4_DUP_PENDING	2

#define	NFS4_DUP_FREE		3

#define	NFS4_DUP_REPLAY 	4

extern rfs4_drc_t *nfs4_drc;

extern unsigned nfs4_drc_lifetime;

extern uint32_t nfs4_drc_max;

extern uint32_t nfs4_drc_hash;

rfs4_drc_t *rfs4_init_drc(uint32_t, uint32_t, unsigned);

void rfs4_fini_drc(rfs4_drc_t *);

void rfs4_dr_chstate(rfs4_dupreq_t *, int);

rfs4_dupreq_t *rfs4_alloc_dr(rfs4_drc_t *);

int rfs4_find_dr(struct svc_req *, rfs4_drc_t *, rfs4_dupreq_t **);

#ifdef	__cplusplus

}

#endif

#endif /* _NFS4_DRC_H */