nfsrvcache.h revision 261055 
1/*-
2 * Copyright (c) 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * $FreeBSD: stable/10/sys/fs/nfs/nfsrvcache.h 261055 2014-01-22 23:55:25Z mav $
33 */
34
35#ifndef _NFS_NFSRVCACHE_H_
36#define	_NFS_NFSRVCACHE_H_
37
38/*
39 * Definitions for the server recent request cache
40 */
41#define	NFSRVCACHE_MAX_SIZE	2048
42#define	NFSRVCACHE_MIN_SIZE	  64
43
44#define	NFSRVCACHE_HASHSIZE	500
45
46/* Cache table entry. */
47struct nfsrvcache {
48	LIST_ENTRY(nfsrvcache) rc_hash;		/* Hash chain */
49	LIST_ENTRY(nfsrvcache) rc_ahash;	/* ACK hash chain */
50	TAILQ_ENTRY(nfsrvcache)	rc_lru;		/* UDP lru chain */
51	u_int32_t	rc_xid;			/* rpc id number */
52	time_t		rc_timestamp;		/* Time done */
53	union {
54		mbuf_t repmb;			/* Reply mbuf list OR */
55		int repstat;			/* Reply status */
56	} rc_un;
57	union {
58		struct {
59			union nethostaddr haddr; /* Host address */
60		} udp;
61		struct {
62			u_int64_t	sockref;
63			u_int32_t	len;
64			u_int32_t	tcpseq;
65			int16_t		refcnt;
66			u_int16_t	cksum;
67			time_t		cachetime;
68			int		acked;
69		} ot;
70	} rc_un2;
71	u_int16_t	rc_proc;		/* rpc proc number */
72	u_int16_t	rc_flag;		/* Flag bits */
73};
74
75#define	rc_reply	rc_un.repmb
76#define	rc_status	rc_un.repstat
77#define	rc_inet		rc_un2.udp.haddr.had_inet.s_addr
78#define	rc_inet6	rc_un2.udp.haddr.had_inet6
79#define	rc_haddr	rc_un2.udp.haddr
80#define	rc_sockref	rc_un2.ot.sockref
81#define	rc_tcpseq	rc_un2.ot.tcpseq
82#define	rc_refcnt	rc_un2.ot.refcnt
83#define	rc_reqlen	rc_un2.ot.len
84#define	rc_cksum	rc_un2.ot.cksum
85#define	rc_cachetime	rc_un2.ot.cachetime
86#define	rc_acked	rc_un2.ot.acked
87
88/* TCP ACK values */
89#define	RC_NO_SEQ		0
90#define	RC_NO_ACK		1
91#define	RC_ACK			2
92#define	RC_NACK			3
93
94/* Return values */
95#define	RC_DROPIT		0
96#define	RC_REPLY		1
97#define	RC_DOIT			2
98
99/* Flag bits */
100#define	RC_LOCKED	0x0001
101#define	RC_WANTED	0x0002
102#define	RC_REPSTATUS	0x0004
103#define	RC_REPMBUF	0x0008
104#define	RC_UDP		0x0010
105#define	RC_INETIPV6	0x0020
106#define	RC_INPROG	0x0040
107#define	RC_NFSV2	0x0100
108#define	RC_NFSV3	0x0200
109#define	RC_NFSV4	0x0400
110#define	RC_NFSVERS	(RC_NFSV2 | RC_NFSV3 | RC_NFSV4)
111#define	RC_REFCNT	0x0800
112#define	RC_SAMETCPCONN	0x1000
113
114LIST_HEAD(nfsrvhashhead, nfsrvcache);
115
116/* The fine-grained locked cache hash table for TCP. */
117struct nfsrchash_bucket {
118	struct mtx		mtx;
119	char			lock_name[16];
120	struct nfsrvhashhead	tbl;
121};
122
123#endif	/* _NFS_NFSRVCACHE_H_ */
124