1 /* $NetBSD: amfs_auto.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997-2014 Erez Zadok
5 * Copyright (c) 1990 Jan-Simon Pendry
6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
7 * Copyright (c) 1990 The Regents of the University of California.
8 * All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * Jan-Simon Pendry at Imperial College, London.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *
38 * File: am-utils/amd/amfs_auto.c
39 *
40 */
41
42 /*
43 * Automount file system
44 */
45
46 #ifdef HAVE_CONFIG_H
47 # include <config.h>
48 #endif /* HAVE_CONFIG_H */
49 #include <am_defs.h>
50 #include <amd.h>
51
52 /****************************************************************************
53 *** MACROS ***
54 ****************************************************************************/
55
56
57 /****************************************************************************
58 *** STRUCTURES ***
59 ****************************************************************************/
60
61
62 /****************************************************************************
63 *** FORWARD DEFINITIONS ***
64 ****************************************************************************/
65 static int amfs_auto_mount(am_node *mp, mntfs *mf);
66
67
68 /****************************************************************************
69 *** OPS STRUCTURES ***
70 ****************************************************************************/
71 am_ops amfs_auto_ops =
72 {
73 "auto",
74 amfs_generic_match,
75 0, /* amfs_auto_init */
76 amfs_auto_mount,
77 amfs_generic_umount,
78 amfs_generic_lookup_child,
79 amfs_generic_mount_child,
80 amfs_generic_readdir,
81 0, /* amfs_auto_readlink */
82 amfs_generic_mounted,
83 0, /* amfs_auto_umounted */
84 amfs_generic_find_srvr,
85 0, /* amfs_auto_get_wchan */
86 FS_AMQINFO | FS_DIRECTORY,
87 #ifdef HAVE_FS_AUTOFS
88 AUTOFS_AUTO_FS_FLAGS,
89 #endif /* HAVE_FS_AUTOFS */
90 };
91
92
93 /****************************************************************************
94 *** FUNCTIONS ***
95 ****************************************************************************/
96 /*
97 * Mount a sub-mount
98 */
99 static int
amfs_auto_mount(am_node * mp,mntfs * mf)100 amfs_auto_mount(am_node *mp, mntfs *mf)
101 {
102 if (mp->am_parent == NULL)
103 return EINVAL;
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_al->al_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 = xstrdup("");
135 } else {
136 /*
137 * the prefix specified as an option
138 */
139 mp->am_pref = xstrdup(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 *) NULL, 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