/* $NetBSD: nfsrvcache.h,v 1.2 2016/12/13 22:52:46 pgoyette Exp $ */

/* $NetBSD: nfsrvcache.h,v 1.2 2016/12/13 22:52:46 pgoyette Exp $ */
/*-
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* FreeBSD: head/sys/fs/nfs/nfsrvcache.h 269347 2014-07-31 19:24:44Z kib
* $NetBSD: nfsrvcache.h,v 1.2 2016/12/13 22:52:46 pgoyette Exp $
*/

#ifndef _NFS_NFSRVCACHE_H_
#define _NFS_NFSRVCACHE_H_

/*
* Definitions for the server recent request cache
*/
#define NFSRVCACHE_MAX_SIZE 2048
#define NFSRVCACHE_MIN_SIZE 64

#define NFSRVCACHE_HASHSIZE 500

/* Cache table entry. */
struct nfsrvcache {
LIST_ENTRY(nfsrvcache) rc_hash; /* Hash chain */
LIST_ENTRY(nfsrvcache) rc_ahash; /* ACK hash chain */
TAILQ_ENTRY(nfsrvcache) rc_lru; /* UDP lru chain */
u_int32_t rc_xid; /* rpc id number */
time_t rc_timestamp; /* Time done */
union {
mbuf_t repmb; /* Reply mbuf list OR */
int repstat; /* Reply status */
} rc_un;
union {
struct {
union nethostaddr haddr; /* Host address */
} udp;
struct {
u_int64_t sockref;
u_int32_t len;
u_int32_t tcpseq;
int16_t refcnt;
u_int16_t cksum;
time_t cachetime;
int acked;
} ot;
} rc_un2;
u_int16_t rc_proc; /* rpc proc number */
u_int16_t rc_flag; /* Flag bits */
};

#define rc_reply rc_un.repmb
#define rc_status rc_un.repstat
#define rc_inet rc_un2.udp.haddr.had_inet.s_addr
#define rc_inet6 rc_un2.udp.haddr.had_inet6
#define rc_haddr rc_un2.udp.haddr
#define rc_sockref rc_un2.ot.sockref
#define rc_tcpseq rc_un2.ot.tcpseq
#define rc_refcnt rc_un2.ot.refcnt
#define rc_reqlen rc_un2.ot.len
#define rc_cksum rc_un2.ot.cksum
#define rc_cachetime rc_un2.ot.cachetime
#define rc_acked rc_un2.ot.acked

/* TCP ACK values */
#define RC_NO_SEQ 0
#define RC_NO_ACK 1
#define RC_ACK 2
#define RC_NACK 3

/* Return values */
#define RC_DROPIT 0
#define RC_REPLY 1
#define RC_DOIT 2

/* Flag bits */
#define RC_LOCKED 0x0001
#define RC_WANTED 0x0002
#define RC_REPSTATUS 0x0004
#define RC_REPMBUF 0x0008
#define RC_UDP 0x0010
#define RC_INETIPV6 0x0020
#define RC_INPROG 0x0040
#define RC_NFSV2 0x0100
#define RC_NFSV3 0x0200
#define RC_NFSV4 0x0400
#define RC_NFSVERS (RC_NFSV2 | RC_NFSV3 | RC_NFSV4)
#define RC_REFCNT 0x0800
#define RC_SAMETCPCONN 0x1000

LIST_HEAD(nfsrvhashhead, nfsrvcache);

/* The fine-grained locked cache hash table for TCP. */
struct nfsrchash_bucket {
struct kmutex mtx;
struct nfsrvhashhead tbl;
};

#endif /* _NFS_NFSRVCACHE_H_ */