1/*	$NetBSD$	*/
2
3/*
4 * Copyright (c) 1997-2009 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. All advertising materials mentioning features or use of this software
22 *    must display the following acknowledgment:
23 *      This product includes software developed by the University of
24 *      California, Berkeley and its contributors.
25 * 4. Neither the name of the University nor the names of its contributors
26 *    may be used to endorse or promote products derived from this software
27 *    without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 *
41 *
42 * File: am-utils/amd/srvr_amfs_auto.c
43 *
44 */
45
46/*
47 * Automount FS server ("localhost") modeling
48 */
49
50#ifdef HAVE_CONFIG_H
51# include <config.h>
52#endif /* HAVE_CONFIG_H */
53#include <am_defs.h>
54#include <amd.h>
55
56/* globals */
57
58/* statics */
59static qelem amfs_auto_srvr_list = {&amfs_auto_srvr_list, &amfs_auto_srvr_list};
60static fserver *localhost;
61
62
63/*
64 * Find an nfs server for the local host
65 */
66fserver *
67amfs_generic_find_srvr(mntfs *mf)
68{
69  fserver *fs = localhost;
70
71  if (!fs) {
72    fs = ALLOC(struct fserver);
73    fs->fs_refc = 0;
74    fs->fs_host = strdup("localhost");
75    fs->fs_ip = NULL;
76    fs->fs_cid = 0;
77    fs->fs_pinger = AM_PINGER;
78    fs->fs_flags = FSF_VALID | FSF_PING_UNINIT;
79    fs->fs_type = "local";
80    fs->fs_private = NULL;
81    fs->fs_prfree = NULL;
82
83    ins_que(&fs->fs_q, &amfs_auto_srvr_list);
84
85    srvrlog(fs, "starts up");
86
87    localhost = fs;
88  }
89  fs->fs_refc++;
90
91  return fs;
92}
93
94
95/*****************************************************************************
96 *** GENERIC ROUTINES FOLLOW
97 *****************************************************************************/
98
99/*
100 * Wakeup anything waiting for this server
101 */
102void
103wakeup_srvr(fserver *fs)
104{
105  fs->fs_flags &= ~FSF_WANT;
106  wakeup((voidp) fs);
107}
108
109
110/*
111 * Called when final ttl of server has expired
112 */
113static void
114timeout_srvr(voidp v)
115{
116  fserver *fs = v;
117
118  /*
119   * If the reference count is still zero then
120   * we are free to remove this node
121   */
122  if (fs->fs_refc == 0) {
123    dlog("Deleting file server %s", fs->fs_host);
124    if (fs->fs_flags & FSF_WANT)
125      wakeup_srvr(fs);
126
127    /*
128     * Remove from queue.
129     */
130    rem_que(&fs->fs_q);
131    /*
132     * (Possibly) call the private free routine.
133     */
134    if (fs->fs_private && fs->fs_prfree)
135      (*fs->fs_prfree) (fs->fs_private);
136
137    /*
138     * Free the net address
139     */
140    if (fs->fs_ip)
141      XFREE(fs->fs_ip);
142
143    /*
144     * Free the host name.
145     */
146    XFREE(fs->fs_host);
147
148    /*
149     * Discard the fserver object.
150     */
151    XFREE(fs);
152  }
153}
154
155
156/*
157 * Free a file server
158 */
159void
160free_srvr(fserver *fs)
161{
162  if (--fs->fs_refc == 0) {
163    /*
164     * The reference count is now zero,
165     * so arrange for this node to be
166     * removed in AM_TTL seconds if no
167     * other mntfs is referencing it.
168     */
169    int ttl = (FSRV_ERROR(fs) || FSRV_ISDOWN(fs)) ? 19 : AM_TTL;
170
171    dlog("Last hard reference to file server %s - will timeout in %ds", fs->fs_host, ttl);
172    if (fs->fs_cid) {
173      untimeout(fs->fs_cid);
174      /*
175       * Turn off pinging - XXX
176       */
177      fs->fs_flags &= ~FSF_PINGING;
178    }
179
180    /*
181     * Keep structure lying around for a while
182     */
183    fs->fs_cid = timeout(ttl, timeout_srvr, (voidp) fs);
184
185    /*
186     * Mark the fileserver down and invalid again
187     */
188    fs->fs_flags &= ~FSF_VALID;
189    fs->fs_flags |= FSF_DOWN;
190  }
191}
192
193
194/*
195 * Make a duplicate fserver reference
196 */
197fserver *
198dup_srvr(fserver *fs)
199{
200  fs->fs_refc++;
201  return fs;
202}
203
204
205/*
206 * Log state change
207 */
208void
209srvrlog(fserver *fs, char *state)
210{
211  plog(XLOG_INFO, "file server %s, type %s, state %s", fs->fs_host, fs->fs_type, state);
212}
213