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      1 /*	$NetBSD: nfsrvcache.h,v 1.2 2016/12/13 22:52:46 pgoyette Exp $	*/
      2 /*-
      3  * Copyright (c) 1989, 1993
      4  *	The Regents of the University of California.  All rights reserved.
      5  *
      6  * This code is derived from software contributed to Berkeley by
      7  * Rick Macklem at The University of Guelph.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  * FreeBSD: head/sys/fs/nfs/nfsrvcache.h 269347 2014-07-31 19:24:44Z kib
     34  * $NetBSD: nfsrvcache.h,v 1.2 2016/12/13 22:52:46 pgoyette Exp $
     35  */
     36 
     37 #ifndef _NFS_NFSRVCACHE_H_
     38 #define	_NFS_NFSRVCACHE_H_
     39 
     40 /*
     41  * Definitions for the server recent request cache
     42  */
     43 #define	NFSRVCACHE_MAX_SIZE	2048
     44 #define	NFSRVCACHE_MIN_SIZE	  64
     45 
     46 #define	NFSRVCACHE_HASHSIZE	500
     47 
     48 /* Cache table entry. */
     49 struct nfsrvcache {
     50 	LIST_ENTRY(nfsrvcache) rc_hash;		/* Hash chain */
     51 	LIST_ENTRY(nfsrvcache) rc_ahash;	/* ACK hash chain */
     52 	TAILQ_ENTRY(nfsrvcache)	rc_lru;		/* UDP lru chain */
     53 	u_int32_t	rc_xid;			/* rpc id number */
     54 	time_t		rc_timestamp;		/* Time done */
     55 	union {
     56 		mbuf_t repmb;			/* Reply mbuf list OR */
     57 		int repstat;			/* Reply status */
     58 	} rc_un;
     59 	union {
     60 		struct {
     61 			union nethostaddr haddr; /* Host address */
     62 		} udp;
     63 		struct {
     64 			u_int64_t	sockref;
     65 			u_int32_t	len;
     66 			u_int32_t	tcpseq;
     67 			int16_t		refcnt;
     68 			u_int16_t	cksum;
     69 			time_t		cachetime;
     70 			int		acked;
     71 		} ot;
     72 	} rc_un2;
     73 	u_int16_t	rc_proc;		/* rpc proc number */
     74 	u_int16_t	rc_flag;		/* Flag bits */
     75 };
     76 
     77 #define	rc_reply	rc_un.repmb
     78 #define	rc_status	rc_un.repstat
     79 #define	rc_inet		rc_un2.udp.haddr.had_inet.s_addr
     80 #define	rc_inet6	rc_un2.udp.haddr.had_inet6
     81 #define	rc_haddr	rc_un2.udp.haddr
     82 #define	rc_sockref	rc_un2.ot.sockref
     83 #define	rc_tcpseq	rc_un2.ot.tcpseq
     84 #define	rc_refcnt	rc_un2.ot.refcnt
     85 #define	rc_reqlen	rc_un2.ot.len
     86 #define	rc_cksum	rc_un2.ot.cksum
     87 #define	rc_cachetime	rc_un2.ot.cachetime
     88 #define	rc_acked	rc_un2.ot.acked
     89 
     90 /* TCP ACK values */
     91 #define	RC_NO_SEQ		0
     92 #define	RC_NO_ACK		1
     93 #define	RC_ACK			2
     94 #define	RC_NACK			3
     95 
     96 /* Return values */
     97 #define	RC_DROPIT		0
     98 #define	RC_REPLY		1
     99 #define	RC_DOIT			2
    100 
    101 /* Flag bits */
    102 #define	RC_LOCKED	0x0001
    103 #define	RC_WANTED	0x0002
    104 #define	RC_REPSTATUS	0x0004
    105 #define	RC_REPMBUF	0x0008
    106 #define	RC_UDP		0x0010
    107 #define	RC_INETIPV6	0x0020
    108 #define	RC_INPROG	0x0040
    109 #define	RC_NFSV2	0x0100
    110 #define	RC_NFSV3	0x0200
    111 #define	RC_NFSV4	0x0400
    112 #define	RC_NFSVERS	(RC_NFSV2 | RC_NFSV3 | RC_NFSV4)
    113 #define	RC_REFCNT	0x0800
    114 #define	RC_SAMETCPCONN	0x1000
    115 
    116 LIST_HEAD(nfsrvhashhead, nfsrvcache);
    117 
    118 /* The fine-grained locked cache hash table for TCP. */
    119 struct nfsrchash_bucket {
    120 	struct kmutex		mtx;
    121 	struct nfsrvhashhead	tbl;
    122 };
    123 
    124 #endif	/* _NFS_NFSRVCACHE_H_ */
    125