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
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/types.h>
35 #include <sys/event.h>
36 #include <sys/mount.h>
50 #define AUTOUNMOUNTD_PIDFILE "/var/run/autounmountd.pid"
52 struct automounted_fs {
53 TAILQ_ENTRY(automounted_fs) af_next;
57 char af_mountpoint[MNAMELEN];
60 static TAILQ_HEAD(, automounted_fs) automounted;
62 static struct automounted_fs *
63 automounted_find(fsid_t fsid)
65 struct automounted_fs *af;
67 TAILQ_FOREACH(af, &automounted, af_next) {
68 if (af->af_fsid.val[0] == fsid.val[0] &&
69 af->af_fsid.val[1] == fsid.val[1])
76 static struct automounted_fs *
77 automounted_add(fsid_t fsid, const char *mountpoint)
79 struct automounted_fs *af;
81 af = calloc(sizeof(*af), 1);
84 af->af_mount_time = time(NULL);
86 strlcpy(af->af_mountpoint, mountpoint, sizeof(af->af_mountpoint));
88 TAILQ_INSERT_TAIL(&automounted, af, af_next);
94 automounted_remove(struct automounted_fs *af)
97 TAILQ_REMOVE(&automounted, af, af_next);
102 refresh_automounted(void)
104 struct automounted_fs *af, *tmpaf;
105 struct statfs *mntbuf;
108 nitems = getmntinfo(&mntbuf, MNT_WAIT);
110 log_err(1, "getmntinfo");
112 log_debugx("refreshing list of automounted filesystems");
114 TAILQ_FOREACH(af, &automounted, af_next)
117 for (i = 0; i < nitems; i++) {
118 if (strcmp(mntbuf[i].f_fstypename, "autofs") == 0) {
119 log_debugx("skipping %s, filesystem type is autofs",
120 mntbuf[i].f_mntonname);
124 if ((mntbuf[i].f_flags & MNT_AUTOMOUNTED) == 0) {
125 log_debugx("skipping %s, not automounted",
126 mntbuf[i].f_mntonname);
130 af = automounted_find(mntbuf[i].f_fsid);
132 log_debugx("new automounted filesystem found on %s "
133 "(FSID:%d:%d)", mntbuf[i].f_mntonname,
134 mntbuf[i].f_fsid.val[0], mntbuf[i].f_fsid.val[1]);
135 af = automounted_add(mntbuf[i].f_fsid,
136 mntbuf[i].f_mntonname);
138 log_debugx("already known automounted filesystem "
139 "found on %s (FSID:%d:%d)", mntbuf[i].f_mntonname,
140 mntbuf[i].f_fsid.val[0], mntbuf[i].f_fsid.val[1]);
145 TAILQ_FOREACH_SAFE(af, &automounted, af_next, tmpaf) {
148 log_debugx("lost filesystem mounted on %s (FSID:%d:%d)",
149 af->af_mountpoint, af->af_fsid.val[0], af->af_fsid.val[1]);
150 automounted_remove(af);
155 unmount_by_fsid(const fsid_t fsid, const char *mountpoint)
160 ret = asprintf(&fsid_str, "FSID:%d:%d", fsid.val[0], fsid.val[1]);
162 log_err(1, "asprintf");
164 error = unmount(fsid_str, MNT_BYFSID);
166 if (errno == EBUSY) {
167 log_debugx("cannot unmount %s (%s): %s",
168 mountpoint, fsid_str, strerror(errno));
170 log_warn("cannot unmount %s (%s)",
171 mountpoint, fsid_str);
181 expire_automounted(double expiration_time)
183 struct automounted_fs *af, *tmpaf;
185 double mounted_for, mounted_max = -1.0;
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 %.0f seconds", af->af_mountpoint,
198 af->af_fsid.val[0], af->af_fsid.val[1],
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 %.0f seconds; unmounting",
209 af->af_mountpoint, af->af_fsid.val[0], af->af_fsid.val[1],
211 error = unmount_by_fsid(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, double sleep_time)
232 struct timespec timeout;
233 struct kevent unused;
236 if (sleep_time != -1.0) {
237 assert(sleep_time > 0.0);
238 timeout.tv_sec = sleep_time;
241 log_debugx("waiting for filesystem event for %.0f seconds", sleep_time);
242 nevents = kevent(kq, NULL, 0, &unused, 1, &timeout);
244 log_debugx("waiting for filesystem event");
245 nevents = kevent(kq, NULL, 0, &unused, 1, NULL);
250 log_err(1, "kevent");
254 log_debugx("timeout reached");
255 assert(sleep_time > 0.0);
257 log_debugx("got filesystem event");
262 main_autounmountd(int argc, char **argv)
267 const char *pidfile_path = AUTOUNMOUNTD_PIDFILE;
268 int ch, debug = 0, error, kq;
269 double expiration_time = 600, retry_time = 600, mounted_max, sleep_time;
270 bool dont_daemonize = false;
272 while ((ch = getopt(argc, argv, "dr:t:v")) != -1) {
275 dont_daemonize = true;
279 retry_time = atoi(optarg);
282 expiration_time = atoi(optarg);
289 usage_autounmountd();
294 usage_autounmountd();
297 log_errx(1, "retry time must be greater than zero");
298 if (expiration_time <= 0)
299 log_errx(1, "expiration time must be greater than zero");
303 pidfh = pidfile_open(pidfile_path, 0600, &otherpid);
305 if (errno == EEXIST) {
306 log_errx(1, "daemon already running, pid: %jd.",
309 log_err(1, "cannot open or create pidfile \"%s\"",
313 if (dont_daemonize == false) {
314 if (daemon(0, 0) == -1) {
315 log_warn("cannot daemonize");
316 pidfile_remove(pidfh);
321 pidfile_write(pidfh);
323 TAILQ_INIT(&automounted);
327 log_err(1, "kqueue");
329 EV_SET(&event, 0, EVFILT_FS, EV_ADD | EV_CLEAR, 0, 0, NULL);
330 error = kevent(kq, &event, 1, NULL, 0, NULL);
332 log_err(1, "kevent");
335 refresh_automounted();
336 mounted_max = expire_automounted(expiration_time);
337 if (mounted_max == -1.0) {
338 sleep_time = mounted_max;
339 log_debugx("no filesystems to expire");
340 } else if (mounted_max < expiration_time) {
341 sleep_time = difftime(expiration_time, mounted_max);
342 log_debugx("some filesystems expire in %.0f seconds",
345 sleep_time = retry_time;
346 log_debugx("some expired filesystems remain mounted, "
347 "will retry in %.0f seconds", sleep_time);
350 do_wait(kq, sleep_time);