2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2014 The FreeBSD Foundation
7 * This software was developed by Edward Tomasz Napierala under sponsorship
8 * from the FreeBSD Foundation.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/types.h>
38 #include <sys/ioctl.h>
39 #include <sys/param.h>
40 #include <sys/linker.h>
41 #include <sys/mount.h>
42 #include <sys/socket.h>
45 #include <sys/utsname.h>
65 unmount_by_statfs(const struct statfs *sb, bool force)
68 int error, ret, flags;
70 ret = asprintf(&fsid_str, "FSID:%d:%d",
71 sb->f_fsid.val[0], sb->f_fsid.val[1]);
73 log_err(1, "asprintf");
75 log_debugx("unmounting %s using %s", sb->f_mntonname, fsid_str);
80 error = unmount(fsid_str, flags);
83 log_warn("cannot unmount %s", sb->f_mntonname);
88 static const struct statfs *
89 find_statfs(const struct statfs *mntbuf, int nitems, const char *mountpoint)
93 for (i = 0; i < nitems; i++) {
94 if (strcmp(mntbuf[i].f_mntonname, mountpoint) == 0)
102 mount_autofs(const char *from, const char *fspath, const char *options,
105 struct iovec *iov = NULL;
107 int error, iovlen = 0;
109 create_directory(fspath);
111 log_debugx("mounting %s on %s, prefix \"%s\", options \"%s\"",
112 from, fspath, prefix, options);
113 memset(errmsg, 0, sizeof(errmsg));
115 build_iovec(&iov, &iovlen, "fstype",
116 __DECONST(void *, "autofs"), (size_t)-1);
117 build_iovec(&iov, &iovlen, "fspath",
118 __DECONST(void *, fspath), (size_t)-1);
119 build_iovec(&iov, &iovlen, "from",
120 __DECONST(void *, from), (size_t)-1);
121 build_iovec(&iov, &iovlen, "errmsg",
122 errmsg, sizeof(errmsg));
125 * Append the options and mountpoint defined in auto_master(5);
126 * this way automountd(8) does not need to parse it.
128 build_iovec(&iov, &iovlen, "master_options",
129 __DECONST(void *, options), (size_t)-1);
130 build_iovec(&iov, &iovlen, "master_prefix",
131 __DECONST(void *, prefix), (size_t)-1);
133 error = nmount(iov, iovlen, 0);
135 if (*errmsg != '\0') {
136 log_err(1, "cannot mount %s on %s: %s",
137 from, fspath, errmsg);
139 log_err(1, "cannot mount %s on %s", from, fspath);
145 mount_if_not_already(const struct node *n, const char *map, const char *options,
146 const char *prefix, const struct statfs *mntbuf, int nitems)
148 const struct statfs *sb;
153 ret = asprintf(&from, "map %s", map);
155 log_err(1, "asprintf");
157 mountpoint = node_path(n);
158 sb = find_statfs(mntbuf, nitems, mountpoint);
160 if (strcmp(sb->f_fstypename, "autofs") != 0) {
161 log_debugx("unknown filesystem mounted "
162 "on %s; mounting", mountpoint);
164 * XXX: Compare options and 'from',
165 * and update the mount if necessary.
168 log_debugx("autofs already mounted "
169 "on %s", mountpoint);
175 log_debugx("nothing mounted on %s; mounting",
179 mount_autofs(from, mountpoint, options, prefix);
185 mount_unmount(struct node *root)
187 struct statfs *mntbuf;
191 nitems = getmntinfo(&mntbuf, MNT_WAIT);
193 log_err(1, "getmntinfo");
195 log_debugx("unmounting stale autofs mounts");
197 for (i = 0; i < nitems; i++) {
198 if (strcmp(mntbuf[i].f_fstypename, "autofs") != 0) {
199 log_debugx("skipping %s, filesystem type is not autofs",
200 mntbuf[i].f_mntonname);
204 n = node_find(root, mntbuf[i].f_mntonname);
206 log_debugx("leaving autofs mounted on %s",
207 mntbuf[i].f_mntonname);
211 log_debugx("autofs mounted on %s not found "
212 "in new configuration; unmounting", mntbuf[i].f_mntonname);
213 unmount_by_statfs(&(mntbuf[i]), false);
216 log_debugx("mounting new autofs mounts");
218 TAILQ_FOREACH(n, &root->n_children, n_next) {
219 if (!node_is_direct_map(n)) {
220 mount_if_not_already(n, n->n_map, n->n_options,
221 n->n_key, mntbuf, nitems);
225 TAILQ_FOREACH(n2, &n->n_children, n_next) {
226 mount_if_not_already(n2, n->n_map, n->n_options,
227 "/", mntbuf, nitems);
233 flush_autofs(const char *fspath)
235 struct iovec *iov = NULL;
237 int error, iovlen = 0;
239 log_debugx("flushing %s", fspath);
240 memset(errmsg, 0, sizeof(errmsg));
242 build_iovec(&iov, &iovlen, "fstype",
243 __DECONST(void *, "autofs"), (size_t)-1);
244 build_iovec(&iov, &iovlen, "fspath",
245 __DECONST(void *, fspath), (size_t)-1);
246 build_iovec(&iov, &iovlen, "errmsg",
247 errmsg, sizeof(errmsg));
249 error = nmount(iov, iovlen, MNT_UPDATE);
251 if (*errmsg != '\0') {
252 log_err(1, "cannot flush %s: %s",
255 log_err(1, "cannot flush %s", fspath);
263 struct statfs *mntbuf;
266 nitems = getmntinfo(&mntbuf, MNT_WAIT);
268 log_err(1, "getmntinfo");
270 log_debugx("flushing autofs caches");
272 for (i = 0; i < nitems; i++) {
273 if (strcmp(mntbuf[i].f_fstypename, "autofs") != 0) {
274 log_debugx("skipping %s, filesystem type is not autofs",
275 mntbuf[i].f_mntonname);
279 flush_autofs(mntbuf[i].f_mntonname);
284 unmount_automounted(bool force)
286 struct statfs *mntbuf;
289 nitems = getmntinfo(&mntbuf, MNT_WAIT);
291 log_err(1, "getmntinfo");
293 log_debugx("unmounting automounted filesystems");
295 for (i = 0; i < nitems; i++) {
296 if (strcmp(mntbuf[i].f_fstypename, "autofs") == 0) {
297 log_debugx("skipping %s, filesystem type is autofs",
298 mntbuf[i].f_mntonname);
302 if ((mntbuf[i].f_flags & MNT_AUTOMOUNTED) == 0) {
303 log_debugx("skipping %s, not automounted",
304 mntbuf[i].f_mntonname);
308 unmount_by_statfs(&(mntbuf[i]), force);
313 usage_automount(void)
316 fprintf(stderr, "usage: automount [-D name=value][-o opts][-Lcfuv]\n");
321 main_automount(int argc, char **argv)
324 int ch, debug = 0, show_maps = 0;
325 char *options = NULL;
326 bool do_unmount = false, force_unmount = false, flush = false;
329 * Note that in automount(8), the only purpose of variable
330 * handling is to aid in debugging maps (automount -L).
334 while ((ch = getopt(argc, argv, "D:Lfco:uv")) != -1) {
337 defined_parse_and_add(optarg);
346 force_unmount = true;
349 options = concat(options, ',', optarg);
366 if (force_unmount && !do_unmount)
377 unmount_automounted(force_unmount);
381 root = node_new_root();
382 parse_master(root, AUTO_MASTER_PATH);
386 node_expand_indirect_maps(root);
387 node_expand_ampersand(root, NULL);
389 node_expand_defined(root);
390 node_print(root, options);