FreeBSD/Linux Kernel Cross Reference
sys/nfs/nqnfs.h
1 /*
2 * Copyright (c) 1992, 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 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)nqnfs.h 8.1 (Berkeley) 6/10/93
37 * $FreeBSD: src/sys/nfs/nqnfs.h,v 1.10.4.1 1999/09/05 08:19:55 peter Exp $
38 */
39
40 #ifndef _NFS_NQNFS_H_
41 #define _NFS_NQNFS_H_
42
43 /*
44 * Definitions for NQNFS (Not Quite NFS) cache consistency protocol.
45 */
46
47 /* Tunable constants */
48 #define NQ_CLOCKSKEW 3 /* Clock skew factor (sec) */
49 #define NQ_WRITESLACK 5 /* Delay for write cache flushing */
50 #define NQ_MAXLEASE 60 /* Max lease duration (sec) */
51 #define NQ_MINLEASE 5 /* Min lease duration (sec) */
52 #define NQ_DEFLEASE 30 /* Default lease duration (sec) */
53 #define NQ_RENEWAL 3 /* Time before expiry (sec) to renew */
54 #define NQ_TRYLATERDEL 15 /* Initial try later delay (sec) */
55 #define NQ_MAXNUMLEASE 2048 /* Upper bound on number of server leases */
56 #define NQ_DEADTHRESH NQ_NEVERDEAD /* Default nm_deadthresh */
57 #define NQ_NEVERDEAD 9 /* Greater than max. nm_timeouts */
58 #define NQLCHSZ 256 /* Server hash table size */
59
60 #define NQNFS_PROG 300105 /* As assigned by Sun */
61 #define NQNFS_VER3 3
62 #define NQNFS_EVICTSIZ 156 /* Size of eviction request in bytes */
63
64 /*
65 * Definitions used for saving the "last lease expires" time in Non-volatile
66 * RAM on the server. The default definitions below assume that NOVRAM is not
67 * available.
68 */
69 #ifdef HASNVRAM
70 # undef HASNVRAM
71 #endif
72 #define NQSTORENOVRAM(t)
73 #define NQLOADNOVRAM(t)
74
75 /*
76 * Defn and structs used on the server to maintain state for current leases.
77 * The list of host(s) that hold the lease are kept as nqhost structures.
78 * The first one lives in nqlease and any others are held in a linked
79 * list of nqm structures hanging off of nqlease.
80 *
81 * Each nqlease structure is chained into two lists. The first is a list
82 * ordered by increasing expiry time for nqsrv_timer() and the second is a chain
83 * hashed on lc_fh.
84 */
85 #define LC_MOREHOSTSIZ 10
86
87 struct nqhost {
88 union {
89 struct {
90 u_short udp_flag;
91 u_short udp_port;
92 union nethostaddr udp_haddr;
93 } un_udp;
94 struct {
95 u_short connless_flag;
96 u_short connless_spare;
97 union nethostaddr connless_haddr;
98 } un_connless;
99 struct {
100 u_short conn_flag;
101 u_short conn_spare;
102 struct nfssvc_sock *conn_slp;
103 } un_conn;
104 } lph_un;
105 };
106 #define lph_flag lph_un.un_udp.udp_flag
107 #define lph_port lph_un.un_udp.udp_port
108 #define lph_haddr lph_un.un_udp.udp_haddr
109 #define lph_inetaddr lph_un.un_udp.udp_haddr.had_inetaddr
110 #define lph_claddr lph_un.un_connless.connless_haddr
111 #define lph_nam lph_un.un_connless.connless_haddr.had_nam
112 #define lph_slp lph_un.un_conn.conn_slp
113
114 struct nqlease {
115 LIST_ENTRY(nqlease) lc_hash; /* Fhandle hash list */
116 CIRCLEQ_ENTRY(nqlease) lc_timer; /* Timer queue list */
117 time_t lc_expiry; /* Expiry time (sec) */
118 struct nqhost lc_host; /* Host that got lease */
119 struct nqm *lc_morehosts; /* Other hosts that share read lease */
120 fsid_t lc_fsid; /* Fhandle */
121 char lc_fiddata[MAXFIDSZ];
122 struct vnode *lc_vp; /* Soft reference to associated vnode */
123 };
124 #define lc_flag lc_host.lph_un.un_udp.udp_flag
125
126 /* lc_flag bits */
127 #define LC_VALID 0x0001 /* Host address valid */
128 #define LC_WRITE 0x0002 /* Write cache */
129 #define LC_NONCACHABLE 0x0004 /* Non-cachable lease */
130 #define LC_LOCKED 0x0008 /* Locked */
131 #define LC_WANTED 0x0010 /* Lock wanted */
132 #define LC_EXPIREDWANTED 0x0020 /* Want lease when expired */
133 #define LC_UDP 0x0040 /* Host address for udp socket */
134 #define LC_CLTP 0x0080 /* Host address for other connectionless */
135 #define LC_LOCAL 0x0100 /* Host is server */
136 #define LC_VACATED 0x0200 /* Host has vacated lease */
137 #define LC_WRITTEN 0x0400 /* Recently wrote to the leased file */
138 #define LC_SREF 0x0800 /* Holds a nfssvc_sock reference */
139
140 struct nqm {
141 struct nqm *lpm_next;
142 struct nqhost lpm_hosts[LC_MOREHOSTSIZ];
143 };
144
145 /*
146 * Special value for slp for local server calls.
147 */
148 #define NQLOCALSLP ((struct nfssvc_sock *) -1)
149
150 /*
151 * Server side macros.
152 */
153 #define nqsrv_getl(v, l) \
154 (void) nqsrv_getlease((v), &nfsd->nd_duration, \
155 ((nfsd->nd_flag & ND_LEASE) ? (nfsd->nd_flag & ND_LEASE) : \
156 ((l) | ND_CHECK)), \
157 slp, procp, nfsd->nd_nam, &cache, &frev, cred)
158
159 /*
160 * Client side macros that check for a valid lease.
161 */
162 #define NQNFS_CKINVALID(v, n, f) \
163 ((time.tv_sec > (n)->n_expiry && \
164 VFSTONFS((v)->v_mount)->nm_timeouts < VFSTONFS((v)->v_mount)->nm_deadthresh) \
165 || ((f) == ND_WRITE && ((n)->n_flag & NQNFSWRITE) == 0))
166
167 #define NQNFS_CKCACHABLE(v, f) \
168 ((time.tv_sec <= VTONFS(v)->n_expiry || \
169 VFSTONFS((v)->v_mount)->nm_timeouts >= VFSTONFS((v)->v_mount)->nm_deadthresh) \
170 && (VTONFS(v)->n_flag & NQNFSNONCACHE) == 0 && \
171 ((f) == ND_READ || (VTONFS(v)->n_flag & NQNFSWRITE)))
172
173 #define NQNFS_NEEDLEASE(v, p) \
174 (time.tv_sec > VTONFS(v)->n_expiry ? \
175 ((VTONFS(v)->n_flag & NQNFSEVICTED) ? 0 : nqnfs_piggy[p]) : \
176 (((time.tv_sec + NQ_RENEWAL) > VTONFS(v)->n_expiry && \
177 nqnfs_piggy[p]) ? \
178 ((VTONFS(v)->n_flag & NQNFSWRITE) ? \
179 ND_WRITE : nqnfs_piggy[p]) : 0))
180
181 /*
182 * List head for timer queue.
183 */
184 extern CIRCLEQ_HEAD(nqtimerhead, nqlease) nqtimerhead;
185
186 /*
187 * List head for the file handle hash table.
188 */
189 #define NQFHHASH(f) \
190 (&nqfhhashtbl[(*((u_long *)(f))) & nqfhhash])
191 extern LIST_HEAD(nqfhhashhead, nqlease) *nqfhhashtbl;
192 extern u_long nqfhhash;
193
194 /*
195 * Nqnfs return status numbers.
196 */
197 #define NQNFS_EXPIRED 500
198 #define NQNFS_TRYLATER 501
199
200 #if defined(KERNEL) || defined(_KERNEL)
201 void nqnfs_lease_check __P((struct vnode *, struct proc *, struct ucred *, int));
202 void nqnfs_lease_updatetime __P((int));
203 int nqsrv_getlease __P((struct vnode *,u_long *,int,struct nfssvc_sock *,struct proc *,struct mbuf *,int *,u_quad_t *,struct ucred *));
204 int nqnfs_getlease __P((struct vnode *,int,struct ucred *,struct proc *));
205 int nqnfs_callback __P((struct nfsmount *,struct mbuf *,struct mbuf *,caddr_t));
206 int nqnfs_clientd __P((struct nfsmount *,struct ucred *,struct nfsd_cargs *,int,caddr_t,struct proc *));
207 struct nfsnode;
208 void nqnfs_clientlease __P((struct nfsmount *, struct nfsnode *, int, int, time_t, u_quad_t));
209 void nqnfs_serverd __P((void));
210 int nqnfsrv_getlease __P((struct nfsrv_descript *, struct nfssvc_sock *, struct proc *, struct mbuf **));
211 int nqnfsrv_vacated __P((struct nfsrv_descript *, struct nfssvc_sock *, struct proc *, struct mbuf **));
212 #endif
213
214 #endif
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