1 /* $NetBSD: restart.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) 1990 Jan-Simon Pendry
6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
7 * Copyright (c) 1990 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/restart.c
39 *
40 */
41
42 #ifdef HAVE_CONFIG_H
43 # include <config.h>
44 #endif /* HAVE_CONFIG_H */
45 #include <am_defs.h>
46 #include <amd.h>
47
48
49 static void
restart_fake_mntfs(mntent_t * me,am_ops * fs_ops)50 restart_fake_mntfs(mntent_t *me, am_ops *fs_ops)
51 {
52 mntfs *mf;
53 am_opts mo;
54 char *cp;
55
56 /*
57 * Partially fake up an opts structure
58 */
59 memset(&mo, 0, sizeof(mo));
60 mo.opt_rhost = NULL;
61 mo.opt_rfs = NULL;
62 cp = strchr(me->mnt_fsname, ':');
63 if (cp) {
64 *cp = '\0';
65 mo.opt_rhost = xstrdup(me->mnt_fsname);
66 mo.opt_rfs = xstrdup(cp + 1);
67 *cp = ':';
68 } else if (STREQ(me->mnt_type, MNTTAB_TYPE_NFS)) {
69 /*
70 * Hacky workaround for mnttab NFS entries that only list the server
71 */
72 plog(XLOG_WARNING, "NFS server entry assumed to be %s:/", me->mnt_fsname);
73 mo.opt_rhost = xstrdup(me->mnt_fsname);
74 mo.opt_rfs = xstrdup("/");
75 me->mnt_fsname = str3cat(me->mnt_fsname, mo.opt_rhost, ":", "/");
76 }
77 mo.opt_fs = me->mnt_dir;
78 mo.opt_opts = me->mnt_opts;
79
80 /*
81 * Make a new mounted filesystem
82 */
83 mf = find_mntfs(fs_ops, &mo, me->mnt_dir,
84 me->mnt_fsname, "", me->mnt_opts, "");
85 if (mf->mf_refc == 1) {
86 mf->mf_flags |= MFF_RESTART | MFF_MOUNTED;
87 mf->mf_error = 0; /* Already mounted correctly */
88 /*
89 * Only timeout non-NFS entries
90 */
91 if (!STREQ(me->mnt_type, MNTTAB_TYPE_NFS))
92 mf->mf_flags |= MFF_RSTKEEP;
93 if (fs_ops->fs_init) {
94 /*
95 * Don't care whether this worked since
96 * it is checked again when the fs is
97 * inherited.
98 */
99 (void) (*fs_ops->fs_init) (mf);
100 }
101 plog(XLOG_INFO, "%s restarted fstype %s on %s, flags 0x%x",
102 me->mnt_fsname, fs_ops->fs_type, me->mnt_dir, mf->mf_flags);
103 } else {
104 /* Something strange happened - two mounts at the same place! */
105 free_mntfs(mf);
106 }
107 /*
108 * Clean up mo
109 */
110 XFREE(mo.opt_rhost);
111 XFREE(mo.opt_rfs);
112 }
113
114
115 /*
116 * Handle an amd restart.
117 *
118 * Scan through the mount list finding all "interesting" mount points.
119 * Next hack up partial data structures and add the mounted file
120 * system to the list of known filesystems.
121 *
122 * This module relies on internal details of other components. If
123 * you change something else make *sure* restart() still works.
124 */
125 void
restart(void)126 restart(void)
127 {
128 mntlist *ml, *mlp;
129
130 /*
131 * Read the existing mount table. For each entry, find nfs, ufs or auto
132 * mounts and create a partial am_node to represent it.
133 */
134 for (mlp = ml = read_mtab("restart", mnttab_file_name);
135 mlp;
136 mlp = mlp->mnext) {
137 mntent_t *me = mlp->mnt;
138 am_ops *fs_ops = NULL;
139
140 if (STREQ(me->mnt_type, MNTTAB_TYPE_NFS)) {
141 /*
142 * NFS entry, or possibly an Amd entry...
143 * The mnt_fsname for daemon mount points is
144 * host:(pidXXX)
145 * or (seen on Solaris)
146 * host:daemon(pidXXX)
147 */
148 char *colon = strchr(me->mnt_fsname, ':');
149 if (colon && strstr(colon, "(pid"))
150 continue;
151 }
152
153 /* Search for the correct filesystem ops */
154 fs_ops = ops_search(me->mnt_type);
155
156 /*
157 * Catch everything else with symlinks to
158 * avoid recursive mounts. This is debatable...
159 */
160 if (!fs_ops)
161 fs_ops = &amfs_link_ops;
162
163 restart_fake_mntfs(me, fs_ops);
164 }
165
166 /*
167 * Free the mount list
168 */
169 free_mntlist(ml);
170 }
171
172
173 /*
174 * Handle an amd restart for amd's own mount points.
175 *
176 * Scan through the mount list finding all daemon mount points
177 * (determined by the presence of a pid inside the mount info).
178 * Next hack up partial data structures and add the mounted file
179 * system to the list of known filesystems.
180 *
181 * This module relies on internal details of other components. If
182 * you change something else make *sure* restart() still works.
183 */
184 void
restart_automounter_nodes(void)185 restart_automounter_nodes(void)
186 {
187 mntlist *ml, *mlp;
188 /* reasonably sized list of restarted nfs ports */
189 u_short old_ports[256];
190
191 memset((voidp) &old_ports, 0, sizeof(u_short) * 256);
192
193 /*
194 * Read the existing mount table. For each entry, find nfs, ufs or auto
195 * mounts and create a partial am_node to represent it.
196 */
197 for (mlp = ml = read_mtab("restart", mnttab_file_name);
198 mlp;
199 mlp = mlp->mnext) {
200 mntent_t *me = mlp->mnt;
201 am_ops *fs_ops = NULL;
202 char *colon;
203 long pid;
204 u_short port;
205 int err;
206
207 if (!STREQ(me->mnt_type, MNTTAB_TYPE_NFS))
208 continue; /* to next mlp */
209 /*
210 * NFS entry, or possibly an Amd entry...
211 * The mnt_fsname for daemon mount points is
212 * host:(pidXXX)
213 * or (seen on Solaris)
214 * host:daemon(pidXXX)
215 */
216 colon = strchr(me->mnt_fsname, ':');
217 if (!colon || !strstr(colon, "(pid"))
218 continue;
219 /* if got here, then we matched an existing Amd mount point */
220 err = 1;
221
222 plog(XLOG_WARNING, "%s is an existing automount point", me->mnt_dir);
223
224 /* Is the old automounter still alive? */
225 if (sscanf(colon, "%*[^(](pid%ld%*[,)]", &pid) != 1) {
226 plog(XLOG_WARNING, "Can't parse pid in %s", me->mnt_fsname);
227 goto give_up;
228 }
229 if (kill(pid, 0) != -1 || errno != ESRCH) {
230 plog(XLOG_WARNING, "Automounter (pid: %ld) still alive", pid);
231 goto give_up;
232 }
233
234 /*
235 * Do we have a map for this mount point? Who cares, we'll restart
236 * anyway -- getting ESTALE is way better than hanging.
237 */
238
239 /* Can we restart it? Only if it tells us what port it was using... */
240 if (sscanf(colon, "%*[^,],port%hu)", &port) != 1) {
241 plog(XLOG_WARNING, "No port specified for %s", me->mnt_fsname);
242 goto give_up;
243 }
244
245 /* Maybe we already own that port... */
246 if (port != nfs_port) {
247 int i;
248 for (i = 0; i < 256; i++) {
249 if (old_ports[i] == port ||
250 old_ports[i] == 0)
251 break;
252 }
253 if (i == 256) {
254 plog(XLOG_WARNING, "Too many open ports (256)");
255 goto give_up;
256 }
257
258 if (old_ports[i] == 0) {
259 int soNFS;
260 SVCXPRT *nfsxprt;
261 if (create_nfs_service(&soNFS, &port, &nfsxprt, nfs_dispatcher,
262 get_nfs_dispatcher_version(nfs_dispatcher)) != 0) {
263 plog(XLOG_WARNING, "Can't bind to port %u", port);
264 goto give_up;
265 }
266 old_ports[i] = nfs_port = port;
267 }
268 }
269 err = 0;
270
271 give_up:
272 if (err) {
273 plog(XLOG_WARNING, "Can't restart %s, leaving it alone", me->mnt_dir);
274 fs_ops = &amfs_link_ops;
275 } else {
276 fs_ops = &amfs_toplvl_ops;
277 }
278
279 restart_fake_mntfs(me, fs_ops);
280 } /* end of "for (mlp" */
281
282 /* free the mount list */
283 free_mntlist(ml);
284 }
285