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1 /*
2 * Copyright (c) 1997-2005 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_linkx.c
41 *
42 */
43
44 /*
45 * Symbol-link file system, with test that the target of the link exists.
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 /* forward declarations */
55 static int amfs_linkx_mount(am_node *mp, mntfs *mf);
56 static int amfs_linkx_umount(am_node *mp, mntfs *mf);
57
58 /*
59 * linkx operations
60 */
61 struct am_ops amfs_linkx_ops =
62 {
63 "linkx",
64 amfs_link_match,
65 0, /* amfs_linkx_init */
66 amfs_linkx_mount,
67 amfs_linkx_umount,
68 amfs_error_lookup_child,
69 amfs_error_mount_child,
70 amfs_error_readdir,
71 0, /* amfs_linkx_readlink */
72 0, /* amfs_linkx_mounted */
73 0, /* amfs_linkx_umounted */
74 amfs_generic_find_srvr,
75 0, /* amfs_linkx_get_wchan */
76 FS_MBACKGROUND,
77 #ifdef HAVE_FS_AUTOFS
78 AUTOFS_LINKX_FS_FLAGS,
79 #endif /* HAVE_FS_AUTOFS */
80 };
81
82
83 static int
84 amfs_linkx_mount(am_node *mp, mntfs *mf)
85 {
86 /*
87 * Check for existence of target.
88 */
89 struct stat stb;
90 char *ln;
91
92 if (mp->am_link)
93 ln = mp->am_link;
94 else /* should never occur */
95 ln = mf->mf_mount;
96
97 /*
98 * Use lstat, not stat, since we don't
99 * want to know if the ultimate target of
100 * a symlink chain exists, just the first.
101 */
102 if (lstat(ln, &stb) < 0)
103 return errno;
104
105 return 0;
106 }
107
108
109 static int
110 amfs_linkx_umount(am_node *mp, mntfs *mf)
111 {
112 return 0;
113 }
114
