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      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 #ifdef	__cplusplus
     30 extern "C" {
     31 #endif
     32 
     33 /*
     34  * NFSv4 Duplicate Request cache.
     35  */
     36 typedef struct rfs4_drc {
     37 	kmutex_t 	lock;
     38 	uint32_t	dr_hash;
     39 	uint32_t 	max_size;
     40 	uint32_t 	in_use;
     41 	list_t		dr_cache;
     42 	list_t  	*dr_buckets;
     43 } rfs4_drc_t;
     44 
     45 /*
     46  * NFSv4 Duplicate request cache entry.
     47  */
     48 typedef struct rfs4_dupreq {
     49 	list_node_t		 dr_bkt_next;
     50 	list_node_t		 dr_next;
     51 	list_t			*dr_bkt;
     52 	rfs4_drc_t		*drc;
     53 	int			 dr_state;
     54 	uint32_t		 dr_xid;
     55 	struct netbuf		 dr_addr;
     56 	COMPOUND4res_srv	 dr_res;
     57 } rfs4_dupreq_t;
     58 
     59 /*
     60  *  State of rfs4_dupreq.
     61  */
     62 #define	NFS4_DUP_ERROR		-1
     63 #define	NFS4_NOT_DUP		0
     64 #define	NFS4_DUP_NEW		1
     65 #define	NFS4_DUP_PENDING	2
     66 #define	NFS4_DUP_FREE		3
     67 
     68 #define	NFS4_DUP_REPLAY 	4
     69 #define	NFS4_DUP_INUSE		5
     70 
     71 extern rfs4_drc_t *nfs4_drc;
     72 extern uint32_t nfs4_drc_max;
     73 extern uint32_t nfs4_drc_hash;
     74 
     75 rfs4_drc_t *rfs4_init_drc(uint32_t, uint32_t);
     76 void rfs4_fini_drc(rfs4_drc_t *);
     77 void rfs4_dr_chstate(rfs4_dupreq_t *, int);
     78 rfs4_dupreq_t *rfs4_alloc_dr(rfs4_drc_t *);
     79 int rfs4_find_dr(struct svc_req *, rfs4_drc_t *, rfs4_dupreq_t **);
     80 
     81 #ifdef	__cplusplus
     82 }
     83 #endif
     84 
     85 #endif /* _NFS4_DRC_H */
     86