2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * 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/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/types.h>
37 #include <sys/ioctl.h>
38 #include <sys/param.h>
39 #include <sys/linker.h>
40 #include <sys/mount.h>
41 #include <sys/socket.h>
44 #include <sys/utsname.h>
64 unmount_by_statfs(const struct statfs *sb, bool force)
67 int error, ret, flags;
69 ret = asprintf(&fsid_str, "FSID:%d:%d",
70 sb->f_fsid.val[0], sb->f_fsid.val[1]);
72 log_err(1, "asprintf");
74 log_debugx("unmounting %s using %s", sb->f_mntonname, fsid_str);
79 error = unmount(fsid_str, flags);
82 log_warn("cannot unmount %s", sb->f_mntonname);
89 static const struct statfs *
90 find_statfs(const struct statfs *mntbuf, int nitems, const char *mountpoint)
94 for (i = 0; i < nitems; i++) {
95 if (strcmp(mntbuf[i].f_mntonname, mountpoint) == 0)
103 mount_autofs(const char *from, const char *fspath, const char *options,
106 struct iovec *iov = NULL;
108 int error, iovlen = 0;
110 create_directory(fspath);
112 log_debugx("mounting %s on %s, prefix \"%s\", options \"%s\"",
113 from, fspath, prefix, options);
114 memset(errmsg, 0, sizeof(errmsg));
116 build_iovec(&iov, &iovlen, "fstype",
117 __DECONST(void *, "autofs"), (size_t)-1);
118 build_iovec(&iov, &iovlen, "fspath",
119 __DECONST(void *, fspath), (size_t)-1);
120 build_iovec(&iov, &iovlen, "from",
121 __DECONST(void *, from), (size_t)-1);
122 build_iovec(&iov, &iovlen, "errmsg",
123 errmsg, sizeof(errmsg));
126 * Append the options and mountpoint defined in auto_master(5);
127 * this way automountd(8) does not need to parse it.
129 build_iovec(&iov, &iovlen, "master_options",
130 __DECONST(void *, options), (size_t)-1);
131 build_iovec(&iov, &iovlen, "master_prefix",
132 __DECONST(void *, prefix), (size_t)-1);
134 error = nmount(iov, iovlen, 0);
136 if (*errmsg != '\0') {
137 log_err(1, "cannot mount %s on %s: %s",
138 from, fspath, errmsg);
140 log_err(1, "cannot mount %s on %s", from, fspath);
146 mount_if_not_already(const struct node *n, const char *map, const char *options,
147 const char *prefix, const struct statfs *mntbuf, int nitems)
149 const struct statfs *sb;
154 ret = asprintf(&from, "map %s", map);
156 log_err(1, "asprintf");
158 mountpoint = node_path(n);
159 sb = find_statfs(mntbuf, nitems, mountpoint);
161 if (strcmp(sb->f_fstypename, "autofs") != 0) {
162 log_debugx("unknown filesystem mounted "
163 "on %s; mounting", mountpoint);
165 * XXX: Compare options and 'from',
166 * and update the mount if necessary.
169 log_debugx("autofs already mounted "
170 "on %s", mountpoint);
176 log_debugx("nothing mounted on %s; mounting",
180 mount_autofs(from, mountpoint, options, prefix);
186 mount_unmount(struct node *root)
188 struct statfs *mntbuf;
192 nitems = getmntinfo(&mntbuf, MNT_WAIT);
194 log_err(1, "getmntinfo");
196 log_debugx("unmounting stale autofs mounts");
198 for (i = 0; i < nitems; i++) {
199 if (strcmp(mntbuf[i].f_fstypename, "autofs") != 0) {
200 log_debugx("skipping %s, filesystem type is not autofs",
201 mntbuf[i].f_mntonname);
205 n = node_find(root, mntbuf[i].f_mntonname);
207 log_debugx("leaving autofs mounted on %s",
208 mntbuf[i].f_mntonname);
212 log_debugx("autofs mounted on %s not found "
213 "in new configuration; unmounting", mntbuf[i].f_mntonname);
214 unmount_by_statfs(&(mntbuf[i]), false);
217 log_debugx("mounting new autofs mounts");
219 TAILQ_FOREACH(n, &root->n_children, n_next) {
220 if (!node_is_direct_map(n)) {
221 mount_if_not_already(n, n->n_map, n->n_options,
222 n->n_key, mntbuf, nitems);
226 TAILQ_FOREACH(n2, &n->n_children, n_next) {
227 mount_if_not_already(n2, n->n_map, n->n_options,
228 "/", mntbuf, nitems);
234 flush_autofs(const char *fspath)
236 struct iovec *iov = NULL;
238 int error, iovlen = 0;
240 log_debugx("flushing %s", fspath);
241 memset(errmsg, 0, sizeof(errmsg));
243 build_iovec(&iov, &iovlen, "fstype",
244 __DECONST(void *, "autofs"), (size_t)-1);
245 build_iovec(&iov, &iovlen, "fspath",
246 __DECONST(void *, fspath), (size_t)-1);
247 build_iovec(&iov, &iovlen, "errmsg",
248 errmsg, sizeof(errmsg));
250 error = nmount(iov, iovlen, MNT_UPDATE);
252 if (*errmsg != '\0') {
253 log_err(1, "cannot flush %s: %s",
256 log_err(1, "cannot flush %s", fspath);
264 struct statfs *mntbuf;
267 nitems = getmntinfo(&mntbuf, MNT_WAIT);
269 log_err(1, "getmntinfo");
271 log_debugx("flushing autofs caches");
273 for (i = 0; i < nitems; i++) {
274 if (strcmp(mntbuf[i].f_fstypename, "autofs") != 0) {
275 log_debugx("skipping %s, filesystem type is not autofs",
276 mntbuf[i].f_mntonname);
280 flush_autofs(mntbuf[i].f_mntonname);
285 unmount_automounted(bool force)
287 struct statfs *mntbuf;
290 nitems = getmntinfo(&mntbuf, MNT_WAIT);
292 log_err(1, "getmntinfo");
294 log_debugx("unmounting automounted filesystems");
296 for (i = 0; i < nitems; i++) {
297 if (strcmp(mntbuf[i].f_fstypename, "autofs") == 0) {
298 log_debugx("skipping %s, filesystem type is autofs",
299 mntbuf[i].f_mntonname);
303 if ((mntbuf[i].f_flags & MNT_AUTOMOUNTED) == 0) {
304 log_debugx("skipping %s, not automounted",
305 mntbuf[i].f_mntonname);
309 unmount_by_statfs(&(mntbuf[i]), force);
314 usage_automount(void)
317 fprintf(stderr, "usage: automount [-D name=value][-o opts][-Lcfuv]\n");
322 main_automount(int argc, char **argv)
325 int ch, debug = 0, show_maps = 0;
326 char *options = NULL;
327 bool do_unmount = false, force_unmount = false, flush = false;
330 * Note that in automount(8), the only purpose of variable
331 * handling is to aid in debugging maps (automount -L).
335 while ((ch = getopt(argc, argv, "D:Lfco:uv")) != -1) {
338 defined_parse_and_add(optarg);
347 force_unmount = true;
350 options = concat(options, ',', optarg);
367 if (force_unmount && !do_unmount)
378 unmount_automounted(force_unmount);
382 root = node_new_root();
383 parse_master(root, AUTO_MASTER_PATH);
387 node_expand_indirect_maps(root);
388 node_expand_ampersand(root, NULL);
390 node_expand_defined(root);
391 node_print(root, options);