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 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26 
  27 /*
  28  * Copyright 2018 Nexenta Systems, Inc.
  29  */
  30 
  31 #ifndef _NFS4_DRC_H
  32 #define _NFS4_DRC_H
  33 
  34 #ifdef  __cplusplus
  35 extern "C" {
  36 #endif
  37 
  38 /*
  39  * NFSv4 Duplicate Request cache.
  40  */
  41 typedef struct rfs4_drc {
  42         kmutex_t        lock;
  43         uint32_t        dr_hash;
  44         uint32_t        max_size;
  45         uint32_t        in_use;
  46         list_t          dr_cache;
  47         list_t          *dr_buckets;
  48 } rfs4_drc_t;
  49 
  50 /*
  51  * NFSv4 Duplicate request cache entry.
  52  */
  53 typedef struct rfs4_dupreq {
  54         list_node_t     dr_bkt_next;
  55         list_node_t     dr_next;
  56         list_t          *dr_bkt;
  57         rfs4_drc_t      *drc;
  58         int             dr_state;
  59         uint32_t        dr_xid;
  60         struct netbuf   dr_addr;
  61         COMPOUND4res    dr_res;
  62 } rfs4_dupreq_t;
  63 
  64 /*
  65  *  State of rfs4_dupreq.
  66  */
  67 #define NFS4_DUP_ERROR          -1
  68 #define NFS4_NOT_DUP            0
  69 #define NFS4_DUP_NEW            1
  70 #define NFS4_DUP_PENDING        2
  71 #define NFS4_DUP_FREE           3
  72 
  73 #define NFS4_DUP_REPLAY         4
  74 #define NFS4_DUP_INUSE          5
  75 
  76 extern uint32_t nfs4_drc_max;
  77 extern uint32_t nfs4_drc_hash;
  78 
  79 rfs4_drc_t *rfs4_init_drc(uint32_t, uint32_t);
  80 void rfs4_fini_drc(void);
  81 void rfs4_dr_chstate(rfs4_dupreq_t *, int);
  82 rfs4_dupreq_t *rfs4_alloc_dr(rfs4_drc_t *);
  83 int rfs4_find_dr(struct svc_req *, rfs4_drc_t *, rfs4_dupreq_t **);
  84 
  85 #ifdef  __cplusplus
  86 }
  87 #endif
  88 
  89 #endif /* _NFS4_DRC_H */