xref: /openbsd-src/usr.sbin/amd/amd/srvr_afs.c (revision 51b02dfeff9bd6b648d789aaf2aef518cdd7e8a7)
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