1 /*
2 * Copyright (c) 1997-2006 Erez Zadok
3 * Copyright (c) 1990 Jan-Simon Pendry
4 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
5 * Copyright (c) 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Jan-Simon Pendry at Imperial College, London.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgment:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 *
40 * File: am-utils/amd/amfs_auto.c
41 *
42 */
43
44 /*
45 * Automount file system
46 */
47
48 #ifdef HAVE_CONFIG_H
49 # include <config.h>
50 #endif /* HAVE_CONFIG_H */
51 #include <am_defs.h>
52 #include <amd.h>
53
54 /****************************************************************************
55 *** MACROS ***
56 ****************************************************************************/
57
58
59 /****************************************************************************
60 *** STRUCTURES ***
61 ****************************************************************************/
62
63
64 /****************************************************************************
65 *** FORWARD DEFINITIONS ***
66 ****************************************************************************/
67 static int amfs_auto_mount(am_node *mp, mntfs *mf);
68
69
70 /****************************************************************************
71 *** OPS STRUCTURES ***
72 ****************************************************************************/
73 am_ops amfs_auto_ops =
74 {
75 "auto",
76 amfs_generic_match,
77 0, /* amfs_auto_init */
78 amfs_auto_mount,
79 amfs_generic_umount,
80 amfs_generic_lookup_child,
81 amfs_generic_mount_child,
82 amfs_generic_readdir,
83 0, /* amfs_auto_readlink */
84 amfs_generic_mounted,
85 0, /* amfs_auto_umounted */
86 amfs_generic_find_srvr,
87 0, /* amfs_auto_get_wchan */
88 FS_AMQINFO | FS_DIRECTORY,
89 #ifdef HAVE_FS_AUTOFS
90 AUTOFS_AUTO_FS_FLAGS,
91 #endif /* HAVE_FS_AUTOFS */
92 };
93
94
95 /****************************************************************************
96 *** FUNCTIONS ***
97 ****************************************************************************/
98 /*
99 * Mount a sub-mount
100 */
101 static int
amfs_auto_mount(am_node * mp,mntfs * mf)102 amfs_auto_mount(am_node *mp, mntfs *mf)
103 {
104 /*
105 * Pseudo-directories are used to provide some structure
106 * to the automounted directories instead
107 * of putting them all in the top-level automount directory.
108 *
109 * Here, just increment the parent's link count.
110 */
111 mp->am_parent->am_fattr.na_nlink++;
112
113 /*
114 * Info field of . means use parent's info field.
115 * Historical - not documented.
116 */
117 if (mf->mf_info[0] == '.' && mf->mf_info[1] == '\0')
118 mf->mf_info = strealloc(mf->mf_info, mp->am_parent->am_mnt->mf_info);
119
120 /*
121 * Compute prefix:
122 *
123 * If there is an option prefix then use that else
124 * If the parent had a prefix then use that with name
125 * of this node appended else
126 * Use the name of this node.
127 *
128 * That means if you want no prefix you must say so
129 * in the map.
130 */
131 if (mf->mf_fo->opt_pref) {
132 /* allow pref:=null to set a real null prefix */
133 if (STREQ(mf->mf_fo->opt_pref, "null")) {
134 mp->am_pref = strdup("");
135 } else {
136 /*
137 * the prefix specified as an option
138 */
139 mp->am_pref = strdup(mf->mf_fo->opt_pref);
140 }
141 } else {
142 /*
143 * else the parent's prefix
144 * followed by the name
145 * followed by /
146 */
147 char *ppref = mp->am_parent->am_pref;
148 if (ppref == 0)
149 ppref = "";
150 mp->am_pref = str3cat((char *) 0, ppref, mp->am_name, "/");
151 }
152
153 #ifdef HAVE_FS_AUTOFS
154 if (mf->mf_flags & MFF_IS_AUTOFS) {
155 char opts[SIZEOF_OPTS];
156 int error;
157
158 autofs_get_opts(opts, sizeof(opts), mp->am_autofs_fh);
159
160 /* now do the mount */
161 error = amfs_mount(mp, mf, opts);
162 if (error) {
163 errno = error;
164 plog(XLOG_FATAL, "amfs_auto_mount: amfs_mount failed: %m");
165 return error;
166 }
167 }
168 #endif /* HAVE_FS_AUTOFS */
169
170 /*
171 * Attach a map cache
172 */
173 amfs_mkcacheref(mf);
174
175 return 0;
176 }
177