1 /*
2 * Copyright (c) 1989 Jan-Simon Pendry
3 * Copyright (c) 1989 Imperial College of Science, Technology & Medicine
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Jan-Simon Pendry at Imperial College, London.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * from: @(#)srvr_afs.c 8.1 (Berkeley) 6/6/93
35 * $Id: srvr_afs.c,v 1.8 2015/12/05 21:15:01 mmcc Exp $
36 */
37
38 /*
39 * Automount FS server ("localhost") modeling
40 */
41
42 #include "am.h"
43
44 extern qelem afs_srvr_list;
45 qelem afs_srvr_list = { &afs_srvr_list, &afs_srvr_list };
46
47 static fserver *localhost;
48
49 /*
50 * Find an nfs server for the local host
51 */
52 fserver *
find_afs_srvr(mntfs * mf)53 find_afs_srvr(mntfs *mf)
54 {
55 fserver *fs = localhost;
56
57 if (!fs) {
58 fs = ALLOC(fserver);
59 fs->fs_refc = 0;
60 fs->fs_host = strdup("localhost");
61 fs->fs_ip = 0;
62 fs->fs_cid = 0;
63 fs->fs_pinger = 0;
64 fs->fs_flags = FSF_VALID;
65 fs->fs_type = "local";
66 fs->fs_private = 0;
67 fs->fs_prfree = 0;
68
69 ins_que(&fs->fs_q, &afs_srvr_list);
70
71 srvrlog(fs, "starts up");
72
73 localhost = fs;
74 }
75
76 fs->fs_refc++;
77
78 return fs;
79 }
80
81 /*------------------------------------------------------------------*/
82 /* Generic routines follow */
83
84 /*
85 * Wakeup anything waiting for this server
86 */
87 void
wakeup_srvr(fserver * fs)88 wakeup_srvr(fserver *fs)
89 {
90 fs->fs_flags &= ~FSF_WANT;
91 wakeup(fs);
92 }
93
94 /*
95 * Called when final ttl of server has expired
96 */
97 static void
timeout_srvr(void * arg)98 timeout_srvr(void *arg)
99 {
100 fserver *fs = arg;
101
102 /*
103 * If the reference count is still zero then
104 * we are free to remove this node
105 */
106 if (fs->fs_refc == 0) {
107 #ifdef DEBUG
108 dlog("Deleting file server %s", fs->fs_host);
109 #endif /* DEBUG */
110 if (fs->fs_flags & FSF_WANT)
111 wakeup_srvr(fs);
112
113 /*
114 * Remove from queue.
115 */
116 rem_que(&fs->fs_q);
117 /*
118 * (Possibly) call the private free routine.
119 */
120 if (fs->fs_private && fs->fs_prfree)
121 (*fs->fs_prfree)(fs->fs_private);
122
123 /*
124 * Free the net address
125 */
126 free(fs->fs_ip);
127
128 /*
129 * Free the host name.
130 */
131 free(fs->fs_host);
132
133 /*
134 * Discard the fserver object.
135 */
136 free(fs);
137 }
138 }
139
140 /*
141 * Free a file server
142 */
143 void
free_srvr(fserver * fs)144 free_srvr(fserver *fs)
145 {
146 if (--fs->fs_refc == 0) {
147 /*
148 * The reference count is now zero,
149 * so arrange for this node to be
150 * removed in AM_TTL seconds if no
151 * other mntfs is referencing it.
152 */
153 int ttl = (fs->fs_flags & (FSF_DOWN|FSF_ERROR)) ? 19 : AM_TTL;
154 #ifdef DEBUG
155 dlog("Last hard reference to file server %s - will timeout in %ds", fs->fs_host, ttl);
156 #endif /* DEBUG */
157 if (fs->fs_cid) {
158 untimeout(fs->fs_cid);
159 /*
160 * Turn off pinging - XXX
161 */
162 fs->fs_flags &= ~FSF_PINGING;
163 }
164 /*
165 * Keep structure lying around for a while
166 */
167 fs->fs_cid = timeout(ttl, timeout_srvr, fs);
168 /*
169 * Mark the fileserver down and invalid again
170 */
171 fs->fs_flags &= ~FSF_VALID;
172 fs->fs_flags |= FSF_DOWN;
173 }
174 }
175
176 /*
177 * Make a duplicate fserver reference
178 */
179 fserver *
dup_srvr(fserver * fs)180 dup_srvr(fserver *fs)
181 {
182 fs->fs_refc++;
183 return fs;
184 }
185
186 /*
187 * Log state change
188 */
srvrlog(fserver * fs,char * state)189 void srvrlog(fserver *fs, char *state)
190 {
191 plog(XLOG_INFO, "file server %s type %s %s", fs->fs_host, fs->fs_type, state);
192 }
193