2 * Copyright (c) 2016 The DragonFly Project
3 * Copyright (c) 2014 The FreeBSD Foundation
6 * This software was developed by Edward Tomasz Napierala under sponsorship
7 * from the FreeBSD Foundation.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/types.h>
33 #include <sys/mount.h>
34 #include <sys/event.h>
46 #define AUTOUNMOUNTD_PIDFILE "/var/run/autounmountd.pid"
48 struct automounted_fs {
49 TAILQ_ENTRY(automounted_fs) af_next;
53 char af_mountpoint[MNAMELEN];
56 static TAILQ_HEAD(, automounted_fs) automounted;
58 static struct automounted_fs *
59 automounted_find(fsid_t fsid)
61 struct automounted_fs *af;
63 TAILQ_FOREACH(af, &automounted, af_next) {
64 if (af->af_fsid.val[0] == fsid.val[0] &&
65 af->af_fsid.val[1] == fsid.val[1])
72 static struct automounted_fs *
73 automounted_add(fsid_t fsid, const char *mountpoint)
75 struct automounted_fs *af;
77 af = calloc(1, sizeof(*af));
80 af->af_mount_time = time(NULL);
82 strlcpy(af->af_mountpoint, mountpoint, sizeof(af->af_mountpoint));
84 TAILQ_INSERT_TAIL(&automounted, af, af_next);
90 automounted_remove(struct automounted_fs *af)
93 TAILQ_REMOVE(&automounted, af, af_next);
98 refresh_automounted(void)
100 struct automounted_fs *af, *tmpaf;
101 struct statfs *mntbuf;
104 nitems = getmntinfo(&mntbuf, MNT_WAIT);
106 log_err(1, "getmntinfo");
108 log_debugx("refreshing list of automounted filesystems");
110 TAILQ_FOREACH(af, &automounted, af_next)
113 for (i = 0; i < nitems; i++) {
114 if (strcmp(mntbuf[i].f_fstypename, "autofs") == 0) {
115 log_debugx("skipping %s, filesystem type is autofs",
116 mntbuf[i].f_mntonname);
120 if ((mntbuf[i].f_flags & MNT_AUTOMOUNTED) == 0) {
121 log_debugx("skipping %s, not automounted",
122 mntbuf[i].f_mntonname);
126 af = automounted_find(mntbuf[i].f_fsid);
128 log_debugx("new automounted filesystem found on %s "
129 "(FSID:%d:%d)", mntbuf[i].f_mntonname,
130 mntbuf[i].f_fsid.val[0], mntbuf[i].f_fsid.val[1]);
131 af = automounted_add(mntbuf[i].f_fsid,
132 mntbuf[i].f_mntonname);
134 log_debugx("already known automounted filesystem "
135 "found on %s (FSID:%d:%d)", mntbuf[i].f_mntonname,
136 mntbuf[i].f_fsid.val[0], mntbuf[i].f_fsid.val[1]);
141 TAILQ_FOREACH_SAFE(af, &automounted, af_next, tmpaf) {
144 log_debugx("lost filesystem mounted on %s (FSID:%d:%d)",
145 af->af_mountpoint, af->af_fsid.val[0], af->af_fsid.val[1]);
146 automounted_remove(af);
151 do_unmount(const fsid_t fsid __unused, const char *mountpoint)
154 int error, isbusy = 0;
156 error = unmount(mountpoint, 0);
158 if (errno == EBUSY) {
160 log_debugx("cannot unmount %s: %s",
161 mountpoint, strerror(errno));
163 log_warn("cannot unmount %s", mountpoint);
168 * XXX: Workaround for DragonFly kernel bug.
169 * https://bugs.dragonflybsd.org/issues/2908
172 log_debugx("workaround DragonFly kernel bug via stat(2)");
173 if (stat(mountpoint, &sb))
174 log_warn("cannot stat %s", mountpoint);
181 expire_automounted(time_t expiration_time)
183 struct automounted_fs *af, *tmpaf;
185 time_t mounted_for, mounted_max = -1;
190 log_debugx("expiring automounted filesystems");
192 TAILQ_FOREACH_SAFE(af, &automounted, af_next, tmpaf) {
193 mounted_for = difftime(now, af->af_mount_time);
195 if (mounted_for < expiration_time) {
196 log_debugx("skipping %s (FSID:%d:%d), mounted "
197 "for %jd seconds", af->af_mountpoint,
198 af->af_fsid.val[0], af->af_fsid.val[1],
199 (intmax_t)mounted_for);
201 if (mounted_for > mounted_max)
202 mounted_max = mounted_for;
207 log_debugx("filesystem mounted on %s (FSID:%d:%d), "
208 "was mounted for %jd seconds; unmounting",
209 af->af_mountpoint, af->af_fsid.val[0], af->af_fsid.val[1],
210 (intmax_t)mounted_for);
211 error = do_unmount(af->af_fsid, af->af_mountpoint);
213 if (mounted_for > mounted_max)
214 mounted_max = mounted_for;
218 return (mounted_max);
222 usage_autounmountd(void)
225 fprintf(stderr, "usage: autounmountd [-r time][-t time][-dv]\n");
230 do_wait(int kq, time_t sleep_time)
232 struct timespec timeout;
233 struct kevent unused;
236 if (sleep_time != -1) {
237 assert(sleep_time > 0);
238 timeout.tv_sec = sleep_time;
241 log_debugx("waiting for filesystem event for %jd seconds",
242 (intmax_t)sleep_time);
243 nevents = kevent(kq, NULL, 0, &unused, 1, &timeout);
245 log_debugx("waiting for filesystem event");
246 nevents = kevent(kq, NULL, 0, &unused, 1, NULL);
251 log_err(1, "kevent");
255 log_debugx("timeout reached");
256 assert(sleep_time > 0);
258 log_debugx("got filesystem event");
263 main_autounmountd(int argc, char **argv)
268 const char *pidfile_path = AUTOUNMOUNTD_PIDFILE;
269 int ch, debug = 0, error, kq;
270 time_t expiration_time = 600, retry_time = 600, mounted_max, sleep_time;
271 bool dont_daemonize = false;
273 while ((ch = getopt(argc, argv, "dr:t:v")) != -1) {
276 dont_daemonize = true;
280 retry_time = atoi(optarg);
283 expiration_time = atoi(optarg);
290 usage_autounmountd();
295 usage_autounmountd();
298 log_errx(1, "retry time must be greater than zero");
299 if (expiration_time <= 0)
300 log_errx(1, "expiration time must be greater than zero");
304 pidfh = pidfile_open(pidfile_path, 0600, &otherpid);
306 if (errno == EEXIST) {
307 log_errx(1, "daemon already running, pid: %jd.",
310 log_err(1, "cannot open or create pidfile \"%s\"",
314 if (dont_daemonize == false) {
315 if (daemon(0, 0) == -1) {
316 log_warn("cannot daemonize");
317 pidfile_remove(pidfh);
322 pidfile_write(pidfh);
324 TAILQ_INIT(&automounted);
328 log_err(1, "kqueue");
330 EV_SET(&event, 0, EVFILT_FS, EV_ADD | EV_CLEAR, 0, 0, NULL);
331 error = kevent(kq, &event, 1, NULL, 0, NULL);
333 log_err(1, "kevent");
336 refresh_automounted();
337 mounted_max = expire_automounted(expiration_time);
338 if (mounted_max == -1) {
339 sleep_time = mounted_max;
340 log_debugx("no filesystems to expire");
341 } else if (mounted_max < expiration_time) {
342 sleep_time = difftime(expiration_time, mounted_max);
343 log_debugx("some filesystems expire in %jd seconds",
344 (intmax_t)sleep_time);
346 sleep_time = retry_time;
347 log_debugx("some expired filesystems remain mounted, "
348 "will retry in %jd seconds", (intmax_t)sleep_time);
351 do_wait(kq, sleep_time);