--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/usr/src/uts/common/nfs/nfs4_drc.h	Fri Jun 24 19:50:32 2005 -0700
@@ -0,0 +1,91 @@
+/*
+ * 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 */