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: releng/10.1/sys/fs/nfs/nfsrvcache.h 269655 2014-08-07 03:50:30Z kib $
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. */
47 struct 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
114 LIST_HEAD(nfsrvhashhead, nfsrvcache);
115
116 /* The fine-grained locked cache hash table for TCP. */
117 struct nfsrchash_bucket {
118 struct mtx mtx;
119 struct nfsrvhashhead tbl;
120 };
121
122 #endif /* _NFS_NFSRVCACHE_H_ */
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