2 * Copyright (c) 1997-2014 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.
8 * This code is derived from software contributed to Berkeley by
9 * Jan-Simon Pendry at Imperial College, London.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * File: am-utils/amd/amfs_union.c
41 * Union automounter file system
46 #endif /* HAVE_CONFIG_H */
50 /****************************************************************************
51 *** FORWARD DEFINITIONS ***
52 ****************************************************************************/
53 static int create_amfs_union_node(char *dir, opaque_t arg);
54 static void amfs_union_mounted(mntfs *mf);
57 /****************************************************************************
58 *** OPS STRUCTURES ***
59 ****************************************************************************/
60 am_ops amfs_union_ops =
64 0, /* amfs_union_init */
67 amfs_generic_lookup_child,
68 amfs_generic_mount_child,
70 0, /* amfs_union_readlink */
72 0, /* amfs_union_umounted */
73 amfs_generic_find_srvr,
74 0, /* amfs_union_get_wchan */
75 FS_MKMNT | FS_NOTIMEOUT | FS_BACKGROUND | FS_AMQINFO | FS_DIRECTORY,
77 AUTOFS_UNION_FS_FLAGS,
78 #endif /* HAVE_FS_AUTOFS */
83 * Create a reference to a union'ed entry
84 * XXX: this function may not be used anywhere...
87 create_amfs_union_node(char *dir, opaque_t arg)
89 if (!STREQ(dir, "/defaults")) {
92 am = amfs_generic_lookup_child(arg, dir, &error, VLOOK_CREATE);
94 (void)amfs_generic_mount_child(am, &error);
96 errno = error; /* XXX */
97 plog(XLOG_ERROR, "unionfs: could not mount %s: %m", dir);
106 amfs_union_mounted(mntfs *mf)
114 * Having made the union mount point,
115 * populate all the entries...
117 for (mp = get_first_exported_ap(&index);
119 mp = get_next_exported_ap(&index)) {
120 if (mp->am_al->al_mnt == mf) {
121 /* return value from create_amfs_union_node is ignored by mapc_keyiter */
122 (void) mapc_keyiter((mnt_map *) mp->am_al->al_mnt->mf_private,
123 create_amfs_union_node,