1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
/*
* Copyright (c) 1992, 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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.
*
* @(#)nqnfs.h 8.1 (Berkeley) 6/10/93
* $Id: nqnfs.h,v 1.3 1994/08/21 06:50:14 paul Exp $
*/
#ifndef _NFS_NQNFS_H_
#define _NFS_NQNFS_H_
/*
* Definitions for NQNFS (Not Quite NFS) cache consistency protocol.
*/
/* Tunable constants */
#define NQ_CLOCKSKEW 3 /* Clock skew factor (sec) */
#define NQ_WRITESLACK 5 /* Delay for write cache flushing */
#define NQ_MAXLEASE 60 /* Max lease duration (sec) */
#define NQ_MINLEASE 5 /* Min lease duration (sec) */
#define NQ_DEFLEASE 30 /* Default lease duration (sec) */
#define NQ_RENEWAL 3 /* Time before expiry (sec) to renew */
#define NQ_TRYLATERDEL 15 /* Initial try later delay (sec) */
#define NQ_MAXNUMLEASE 2048 /* Upper bound on number of server leases */
#define NQ_DEADTHRESH NQ_NEVERDEAD /* Default nm_deadthresh */
#define NQ_NEVERDEAD 9 /* Greater than max. nm_timeouts */
#define NQLCHSZ 256 /* Server hash table size */
#define NQNFS_PROG 300105 /* As assigned by Sun */
#define NQNFS_VER1 1
#define NQNFS_EVICTSIZ 156 /* Size of eviction request in bytes */
/*
* Definitions used for saving the "last lease expires" time in Non-volatile
* RAM on the server. The default definitions below assume that NOVRAM is not
* available.
*/
#define NQSTORENOVRAM(t)
#define NQLOADNOVRAM(t)
/*
* Defn and structs used on the server to maintain state for current leases.
* The list of host(s) that hold the lease are kept as nqhost structures.
* The first one lives in nqlease and any others are held in a linked
* list of nqm structures hanging off of nqlease.
*
* Each nqlease structure is chained into two lists. The first is a list
* ordered by increasing expiry time for nqsrv_timer() and the second is a chain
* hashed on lc_fh.
*/
#define LC_MOREHOSTSIZ 10
struct nqhost {
union {
struct {
u_short udp_flag;
u_short udp_port;
union nethostaddr udp_haddr;
} un_udp;
struct {
u_short connless_flag;
u_short connless_spare;
union nethostaddr connless_haddr;
} un_connless;
struct {
u_short conn_flag;
u_short conn_spare;
struct nfssvc_sock *conn_slp;
} un_conn;
} lph_un;
};
#define lph_flag lph_un.un_udp.udp_flag
#define lph_port lph_un.un_udp.udp_port
#define lph_haddr lph_un.un_udp.udp_haddr
#define lph_inetaddr lph_un.un_udp.udp_haddr.had_inetaddr
#define lph_claddr lph_un.un_connless.connless_haddr
#define lph_nam lph_un.un_connless.connless_haddr.had_nam
#define lph_slp lph_un.un_conn.conn_slp
struct nqlease {
struct nqlease *lc_chain1[2]; /* Timer queue list (must be first) */
struct nqlease *lc_fhnext; /* Fhandle hash list */
struct nqlease **lc_fhprev;
time_t lc_expiry; /* Expiry time (sec) */
struct nqhost lc_host; /* Host that got lease */
struct nqm *lc_morehosts; /* Other hosts that share read lease */
fsid_t lc_fsid; /* Fhandle */
char lc_fiddata[MAXFIDSZ];
struct vnode *lc_vp; /* Soft reference to associated vnode */
};
#define lc_flag lc_host.lph_un.un_udp.udp_flag
/* lc_flag bits */
#define LC_VALID 0x0001 /* Host address valid */
#define LC_WRITE 0x0002 /* Write cache */
#define LC_NONCACHABLE 0x0004 /* Non-cachable lease */
#define LC_LOCKED 0x0008 /* Locked */
#define LC_WANTED 0x0010 /* Lock wanted */
#define LC_EXPIREDWANTED 0x0020 /* Want lease when expired */
#define LC_UDP 0x0040 /* Host address for udp socket */
#define LC_CLTP 0x0080 /* Host address for other connectionless */
#define LC_LOCAL 0x0100 /* Host is server */
#define LC_VACATED 0x0200 /* Host has vacated lease */
#define LC_WRITTEN 0x0400 /* Recently wrote to the leased file */
#define LC_SREF 0x0800 /* Holds a nfssvc_sock reference */
struct nqm {
struct nqm *lpm_next;
struct nqhost lpm_hosts[LC_MOREHOSTSIZ];
};
/*
* Flag bits for flags argument to nqsrv_getlease.
*/
#define NQL_READ LEASE_READ /* Read Request */
#define NQL_WRITE LEASE_WRITE /* Write Request */
#define NQL_CHECK 0x4 /* Check for lease */
#define NQL_NOVAL 0xffffffff /* Invalid */
/*
* Special value for slp for local server calls.
*/
#define NQLOCALSLP ((struct nfssvc_sock *) -1)
/*
* Server side macros.
*/
#define nqsrv_getl(v, l) \
(void) nqsrv_getlease((v), &nfsd->nd_duration, \
((nfsd->nd_nqlflag != 0 && nfsd->nd_nqlflag != NQL_NOVAL) ? nfsd->nd_nqlflag : \
((l) | NQL_CHECK)), \
nfsd, nam, &cache, &frev, cred)
/*
* Client side macros that check for a valid lease.
*/
#define NQNFS_CKINVALID(v, n, f) \
((time.tv_sec > (n)->n_expiry && \
VFSTONFS((v)->v_mount)->nm_timeouts < VFSTONFS((v)->v_mount)->nm_deadthresh) \
|| ((f) == NQL_WRITE && ((n)->n_flag & NQNFSWRITE) == 0))
#define NQNFS_CKCACHABLE(v, f) \
((time.tv_sec <= VTONFS(v)->n_expiry || \
VFSTONFS((v)->v_mount)->nm_timeouts >= VFSTONFS((v)->v_mount)->nm_deadthresh) \
&& (VTONFS(v)->n_flag & NQNFSNONCACHE) == 0 && \
((f) == NQL_READ || (VTONFS(v)->n_flag & NQNFSWRITE)))
#define NQNFS_NEEDLEASE(v, p) \
(time.tv_sec > VTONFS(v)->n_expiry ? \
((VTONFS(v)->n_flag & NQNFSEVICTED) ? 0 : nqnfs_piggy[p]) : \
(((time.tv_sec + NQ_RENEWAL) > VTONFS(v)->n_expiry && \
nqnfs_piggy[p]) ? \
((VTONFS(v)->n_flag & NQNFSWRITE) ? \
NQL_WRITE : nqnfs_piggy[p]) : 0))
/*
* List head for timer queue.
*/
extern union nqsrvthead {
union nqsrvthead *th_head[2];
struct nqlease *th_chain[2];
} nqthead;
extern struct nqlease **nqfhead;
extern u_long nqfheadhash;
/*
* Nqnfs return status numbers.
*/
#define NQNFS_EXPIRED 500
#define NQNFS_TRYLATER 501
#define NQNFS_AUTHERR 502
#ifdef KERNEL
void nfs_lease_check __P((struct vnode *, struct proc *, struct ucred *, int));
void nfs_lease_updatetime __P((int));
#endif
#endif
|
