1 /* $NetBSD: srvr_amfs_auto.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997-2014 Erez Zadok
5 * Copyright (c) 1989 Jan-Simon Pendry
6 * Copyright (c) 1989 Imperial College of Science, Technology & Medicine
7 * Copyright (c) 1989 The Regents of the University of California.
8 * All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * Jan-Simon Pendry at Imperial College, London.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *
38 * File: am-utils/amd/srvr_amfs_auto.c
39 *
40 */
41
42 /*
43 * Automount FS server ("localhost") modeling
44 */
45
46 #ifdef HAVE_CONFIG_H
47 # include <config.h>
48 #endif /* HAVE_CONFIG_H */
49 #include <am_defs.h>
50 #include <amd.h>
51
52 /* globals */
53
54 /* statics */
55 static qelem amfs_auto_srvr_list = {&amfs_auto_srvr_list, &amfs_auto_srvr_list};
56 static fserver *localhost;
57
58
59 /*
60 * Find an nfs server for the local host
61 */
62 fserver *
amfs_generic_find_srvr(mntfs * mf)63 amfs_generic_find_srvr(mntfs *mf)
64 {
65 fserver *fs = localhost;
66
67 if (!fs) {
68 fs = ALLOC(struct fserver);
69 fs->fs_refc = 0;
70 fs->fs_host = xstrdup("localhost");
71 fs->fs_ip = NULL;
72 fs->fs_cid = 0;
73 fs->fs_pinger = AM_PINGER;
74 fs->fs_flags = FSF_VALID | FSF_PING_UNINIT;
75 fs->fs_type = "local";
76 fs->fs_private = NULL;
77 fs->fs_prfree = NULL;
78
79 ins_que(&fs->fs_q, &amfs_auto_srvr_list);
80
81 srvrlog(fs, "starts up");
82
83 localhost = fs;
84 }
85 fs->fs_refc++;
86
87 return fs;
88 }
89
90
91 /*****************************************************************************
92 *** GENERIC ROUTINES FOLLOW
93 *****************************************************************************/
94
95 /*
96 * Wakeup anything waiting for this server
97 */
98 void
wakeup_srvr(fserver * fs)99 wakeup_srvr(fserver *fs)
100 {
101 fs->fs_flags &= ~FSF_WANT;
102 wakeup((voidp) fs);
103 }
104
105
106 /*
107 * Called when final ttl of server has expired
108 */
109 static void
timeout_srvr(voidp v)110 timeout_srvr(voidp v)
111 {
112 fserver *fs = v;
113
114 /*
115 * If the reference count is still zero then
116 * we are free to remove this node
117 */
118 if (fs->fs_refc == 0) {
119 dlog("Deleting file server %s", fs->fs_host);
120 if (fs->fs_flags & FSF_WANT)
121 wakeup_srvr(fs);
122
123 /*
124 * Remove from queue.
125 */
126 rem_que(&fs->fs_q);
127 /*
128 * (Possibly) call the private free routine.
129 */
130 if (fs->fs_private && fs->fs_prfree)
131 (*fs->fs_prfree) (fs->fs_private);
132
133 /*
134 * Free the net address
135 */
136 XFREE(fs->fs_ip);
137
138 /*
139 * Free the host name.
140 */
141 XFREE(fs->fs_host);
142
143 /*
144 * Discard the fserver object.
145 */
146 XFREE(fs);
147 }
148 }
149
150
151 /*
152 * Free a file server
153 */
154 void
free_srvr(fserver * fs)155 free_srvr(fserver *fs)
156 {
157 if (--fs->fs_refc == 0) {
158 /*
159 * The reference count is now zero,
160 * so arrange for this node to be
161 * removed in AM_TTL seconds if no
162 * other mntfs is referencing it.
163 */
164 int ttl = (FSRV_ERROR(fs) || FSRV_ISDOWN(fs)) ? 19 : AM_TTL;
165
166 dlog("Last hard reference to file server %s - will timeout in %ds", fs->fs_host, ttl);
167 if (fs->fs_cid) {
168 untimeout(fs->fs_cid);
169 /*
170 * Turn off pinging - XXX
171 */
172 fs->fs_flags &= ~FSF_PINGING;
173 }
174
175 /*
176 * Keep structure lying around for a while
177 */
178 fs->fs_cid = timeout(ttl, timeout_srvr, (voidp) fs);
179
180 /*
181 * Mark the fileserver down and invalid again
182 */
183 fs->fs_flags &= ~FSF_VALID;
184 fs->fs_flags |= FSF_DOWN;
185 }
186 }
187
188
189 /*
190 * Make a duplicate fserver reference
191 */
192 fserver *
dup_srvr(fserver * fs)193 dup_srvr(fserver *fs)
194 {
195 fs->fs_refc++;
196 return fs;
197 }
198
199
200 /*
201 * Log state change
202 */
203 void
srvrlog(fserver * fs,char * state)204 srvrlog(fserver *fs, char *state)
205 {
206 plog(XLOG_INFO, "file server %s, type %s, state %s", fs->fs_host, fs->fs_type, state);
207 }
208