2 * Copyright (c) 2014 The FreeBSD Foundation
5 * This software was developed by Edward Tomasz Napierala under sponsorship
6 * from the FreeBSD Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/types.h>
33 #include <sys/event.h>
34 #include <sys/mount.h>
48 #define AUTOUNMOUNTD_PIDFILE "/var/run/autounmountd.pid"
50 struct automounted_fs {
51 TAILQ_ENTRY(automounted_fs) af_next;
55 char af_mountpoint[MNAMELEN];
58 static TAILQ_HEAD(, automounted_fs) automounted;
60 static struct automounted_fs *
61 automounted_find(fsid_t fsid)
63 struct automounted_fs *af;
65 TAILQ_FOREACH(af, &automounted, af_next) {
66 if (af->af_fsid.val[0] == fsid.val[0] &&
67 af->af_fsid.val[1] == fsid.val[1])
74 static struct automounted_fs *
75 automounted_add(fsid_t fsid, const char *mountpoint)
77 struct automounted_fs *af;
79 af = calloc(sizeof(*af), 1);
82 af->af_mount_time = time(NULL);
84 strlcpy(af->af_mountpoint, mountpoint, sizeof(af->af_mountpoint));
86 TAILQ_INSERT_TAIL(&automounted, af, af_next);
92 automounted_remove(struct automounted_fs *af)
95 TAILQ_REMOVE(&automounted, af, af_next);
100 refresh_automounted(void)
102 struct automounted_fs *af, *tmpaf;
103 struct statfs *mntbuf;
106 nitems = getmntinfo(&mntbuf, MNT_WAIT);
108 log_err(1, "getmntinfo");
110 log_debugx("refreshing list of automounted filesystems");
112 TAILQ_FOREACH(af, &automounted, af_next)
115 for (i = 0; i < nitems; i++) {
116 if (strcmp(mntbuf[i].f_fstypename, "autofs") == 0) {
117 log_debugx("skipping %s, filesystem type is autofs",
118 mntbuf[i].f_mntonname);
122 if ((mntbuf[i].f_flags & MNT_AUTOMOUNTED) == 0) {
123 log_debugx("skipping %s, not automounted",
124 mntbuf[i].f_mntonname);
128 af = automounted_find(mntbuf[i].f_fsid);
130 log_debugx("new automounted filesystem found on %s "
131 "(FSID:%d:%d)", mntbuf[i].f_mntonname,
132 mntbuf[i].f_fsid.val[0], mntbuf[i].f_fsid.val[1]);
133 af = automounted_add(mntbuf[i].f_fsid,
134 mntbuf[i].f_mntonname);
136 log_debugx("already known automounted filesystem "
137 "found on %s (FSID:%d:%d)", mntbuf[i].f_mntonname,
138 mntbuf[i].f_fsid.val[0], mntbuf[i].f_fsid.val[1]);
143 TAILQ_FOREACH_SAFE(af, &automounted, af_next, tmpaf) {
146 log_debugx("lost filesystem mounted on %s (FSID:%d:%d)",
147 af->af_mountpoint, af->af_fsid.val[0], af->af_fsid.val[1]);
148 automounted_remove(af);
153 unmount_by_fsid(const fsid_t fsid, const char *mountpoint)
158 ret = asprintf(&fsid_str, "FSID:%d:%d", fsid.val[0], fsid.val[1]);
160 log_err(1, "asprintf");
162 error = unmount(fsid_str, MNT_BYFSID);
164 if (errno == EBUSY) {
165 log_debugx("cannot unmount %s (%s): %s",
166 mountpoint, fsid_str, strerror(errno));
168 log_warn("cannot unmount %s (%s)",
169 mountpoint, fsid_str);
179 expire_automounted(double expiration_time)
181 struct automounted_fs *af, *tmpaf;
183 double mounted_for, mounted_max = 0;
188 log_debugx("expiring automounted filesystems");
190 TAILQ_FOREACH_SAFE(af, &automounted, af_next, tmpaf) {
191 mounted_for = difftime(now, af->af_mount_time);
193 if (mounted_for < expiration_time) {
194 log_debugx("skipping %s (FSID:%d:%d), mounted "
195 "for %.0f seconds", af->af_mountpoint,
196 af->af_fsid.val[0], af->af_fsid.val[1],
199 if (mounted_for > mounted_max)
200 mounted_max = mounted_for;
205 log_debugx("filesystem mounted on %s (FSID:%d:%d), "
206 "was mounted for %.0f seconds; unmounting",
207 af->af_mountpoint, af->af_fsid.val[0], af->af_fsid.val[1],
209 error = unmount_by_fsid(af->af_fsid, af->af_mountpoint);
211 if (mounted_for > mounted_max)
212 mounted_max = mounted_for;
216 return (mounted_max);
220 usage_autounmountd(void)
223 fprintf(stderr, "usage: autounmountd [-r time][-t time][-dv]\n");
228 do_wait(int kq, double sleep_time)
230 struct timespec timeout;
231 struct kevent unused;
234 assert(sleep_time > 0);
235 timeout.tv_sec = sleep_time;
238 log_debugx("waiting for filesystem event for %.0f seconds", sleep_time);
239 error = kevent(kq, NULL, 0, &unused, 1, &timeout);
241 log_err(1, "kevent");
244 log_debugx("timeout reached");
246 log_debugx("got filesystem event");
250 main_autounmountd(int argc, char **argv)
255 const char *pidfile_path = AUTOUNMOUNTD_PIDFILE;
256 int ch, debug = 0, error, kq;
257 double expiration_time = 600, retry_time = 600, mounted_max, sleep_time;
258 bool dont_daemonize = false;
260 while ((ch = getopt(argc, argv, "dr:t:v")) != -1) {
263 dont_daemonize = true;
267 retry_time = atoi(optarg);
270 expiration_time = atoi(optarg);
277 usage_autounmountd();
282 usage_autounmountd();
285 log_errx(1, "retry time must be greater than zero");
286 if (expiration_time <= 0)
287 log_errx(1, "expiration time must be greater than zero");
291 pidfh = pidfile_open(pidfile_path, 0600, &otherpid);
293 if (errno == EEXIST) {
294 log_errx(1, "daemon already running, pid: %jd.",
297 log_err(1, "cannot open or create pidfile \"%s\"",
301 if (dont_daemonize == false) {
302 if (daemon(0, 0) == -1) {
303 log_warn("cannot daemonize");
304 pidfile_remove(pidfh);
309 pidfile_write(pidfh);
311 TAILQ_INIT(&automounted);
315 log_err(1, "kqueue");
317 EV_SET(&event, 0, EVFILT_FS, EV_ADD | EV_CLEAR, 0, 0, NULL);
318 error = kevent(kq, &event, 1, NULL, 0, NULL);
320 log_err(1, "kevent");
323 refresh_automounted();
324 mounted_max = expire_automounted(expiration_time);
325 if (mounted_max < expiration_time) {
326 sleep_time = difftime(expiration_time, mounted_max);
327 log_debugx("some filesystems expire in %.0f seconds",
330 sleep_time = retry_time;
331 log_debugx("some expired filesystems remain mounted, "
332 "will retry in %.0f seconds", sleep_time);
335 do_wait(kq, sleep_time);