1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2014 The FreeBSD Foundation
5 *
6 * This software was developed by Edward Tomasz Napierala under sponsorship
7 * from the FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
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.
17 *
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
28 * SUCH DAMAGE.
29 *
30 */
31
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/conf.h>
36 #include <sys/condvar.h>
37 #include <sys/ioccom.h>
38 #include <sys/kernel.h>
39 #include <sys/module.h>
40 #include <sys/mount.h>
41 #include <sys/stat.h>
42 #include <sys/sx.h>
43 #include <sys/taskqueue.h>
44 #include <sys/tree.h>
45 #include <sys/vnode.h>
46
47 #include <fs/autofs/autofs.h>
48
49 static const char *autofs_opts[] = {
50 "from", "master_options", "master_prefix", NULL
51 };
52
53 extern struct autofs_softc *autofs_softc;
54
55 static int
autofs_mount(struct mount * mp)56 autofs_mount(struct mount *mp)
57 {
58 struct autofs_mount *amp;
59 char *from, *fspath, *options, *prefix;
60 int error;
61
62 if (vfs_filteropt(mp->mnt_optnew, autofs_opts))
63 return (EINVAL);
64
65 if (mp->mnt_flag & MNT_UPDATE) {
66 autofs_flush(VFSTOAUTOFS(mp));
67 return (0);
68 }
69
70 if (vfs_getopt(mp->mnt_optnew, "from", (void **)&from, NULL))
71 return (EINVAL);
72
73 if (vfs_getopt(mp->mnt_optnew, "fspath", (void **)&fspath, NULL))
74 return (EINVAL);
75
76 if (vfs_getopt(mp->mnt_optnew, "master_options", (void **)&options, NULL))
77 return (EINVAL);
78
79 if (vfs_getopt(mp->mnt_optnew, "master_prefix", (void **)&prefix, NULL))
80 return (EINVAL);
81
82 amp = malloc(sizeof(*amp), M_AUTOFS, M_WAITOK | M_ZERO);
83 mp->mnt_data = amp;
84 amp->am_mp = mp;
85 strlcpy(amp->am_from, from, sizeof(amp->am_from));
86 strlcpy(amp->am_mountpoint, fspath, sizeof(amp->am_mountpoint));
87 strlcpy(amp->am_options, options, sizeof(amp->am_options));
88 strlcpy(amp->am_prefix, prefix, sizeof(amp->am_prefix));
89 sx_init(&->am_lock, "autofslk");
90 amp->am_last_fileno = 1;
91
92 vfs_getnewfsid(mp);
93
94 MNT_ILOCK(mp);
95 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED;
96 MNT_IUNLOCK(mp);
97
98 AUTOFS_XLOCK(amp);
99 error = autofs_node_new(NULL, amp, ".", -1, &->am_root);
100 if (error != 0) {
101 AUTOFS_XUNLOCK(amp);
102 free(amp, M_AUTOFS);
103 return (error);
104 }
105 AUTOFS_XUNLOCK(amp);
106
107 vfs_mountedfrom(mp, from);
108
109 return (0);
110 }
111
112 static int
autofs_unmount(struct mount * mp,int mntflags)113 autofs_unmount(struct mount *mp, int mntflags)
114 {
115 struct autofs_mount *amp;
116 struct autofs_node *anp;
117 struct autofs_request *ar;
118 int error, flags;
119 bool found;
120
121 amp = VFSTOAUTOFS(mp);
122
123 flags = 0;
124 if (mntflags & MNT_FORCE)
125 flags |= FORCECLOSE;
126 error = vflush(mp, 0, flags, curthread);
127 if (error != 0) {
128 AUTOFS_DEBUG("vflush failed with error %d", error);
129 return (error);
130 }
131
132 /*
133 * All vnodes are gone, and new one will not appear - so,
134 * no new triggerings. We can iterate over outstanding
135 * autofs_requests and terminate them.
136 */
137 for (;;) {
138 found = false;
139 sx_xlock(&autofs_softc->sc_lock);
140 TAILQ_FOREACH(ar, &autofs_softc->sc_requests, ar_next) {
141 if (ar->ar_mount != amp)
142 continue;
143 ar->ar_error = ENXIO;
144 ar->ar_done = true;
145 ar->ar_in_progress = false;
146 found = true;
147 }
148 sx_xunlock(&autofs_softc->sc_lock);
149 if (found == false)
150 break;
151
152 cv_broadcast(&autofs_softc->sc_cv);
153 pause("autofs_umount", 1);
154 }
155
156 AUTOFS_XLOCK(amp);
157
158 /*
159 * Not terribly efficient, but at least not recursive.
160 */
161 while (!RB_EMPTY(&->am_root->an_children)) {
162 anp = RB_MIN(autofs_node_tree, &->am_root->an_children);
163 while (!RB_EMPTY(&anp->an_children))
164 anp = RB_MIN(autofs_node_tree, &anp->an_children);
165 autofs_node_delete(anp);
166 }
167 autofs_node_delete(amp->am_root);
168
169 mp->mnt_data = NULL;
170 AUTOFS_XUNLOCK(amp);
171
172 sx_destroy(&->am_lock);
173
174 free(amp, M_AUTOFS);
175
176 return (0);
177 }
178
179 static int
autofs_root(struct mount * mp,int flags,struct vnode ** vpp)180 autofs_root(struct mount *mp, int flags, struct vnode **vpp)
181 {
182 struct autofs_mount *amp;
183 int error;
184
185 amp = VFSTOAUTOFS(mp);
186
187 error = autofs_node_vn(amp->am_root, mp, flags, vpp);
188
189 return (error);
190 }
191
192 static int
autofs_statfs(struct mount * mp,struct statfs * sbp)193 autofs_statfs(struct mount *mp, struct statfs *sbp)
194 {
195
196 sbp->f_bsize = S_BLKSIZE;
197 sbp->f_iosize = 0;
198 sbp->f_blocks = 0;
199 sbp->f_bfree = 0;
200 sbp->f_bavail = 0;
201 sbp->f_files = 0;
202 sbp->f_ffree = 0;
203
204 return (0);
205 }
206
207 static struct vfsops autofs_vfsops = {
208 .vfs_fhtovp = NULL, /* XXX */
209 .vfs_mount = autofs_mount,
210 .vfs_unmount = autofs_unmount,
211 .vfs_root = autofs_root,
212 .vfs_statfs = autofs_statfs,
213 .vfs_init = autofs_init,
214 .vfs_uninit = autofs_uninit,
215 };
216
217 VFS_SET(autofs_vfsops, autofs, VFCF_SYNTHETIC | VFCF_NETWORK);
218 MODULE_VERSION(autofs, 1);
219