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
  32 extern "C" {
  33 #endif
  34 
  35 /*
  36  * NFSv4 Duplicate Request cache.
  37  */
  38 typedef 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  */
  50 typedef 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 
  73 extern rfs4_drc_t *nfs4_drc;
  74 extern uint32_t nfs4_drc_max;
  75 extern uint32_t nfs4_drc_hash;
  76 
  77 rfs4_drc_t *rfs4_init_drc(uint32_t, uint32_t);
  78 void rfs4_fini_drc(rfs4_drc_t *);
  79 void rfs4_dr_chstate(rfs4_dupreq_t *, int);
  80 rfs4_dupreq_t *rfs4_alloc_dr(rfs4_drc_t *);
  81 int 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 */