1 /* $NetBSD: amfs_linkx.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_linkx.c
39 *
40 */
41
42 /*
43 * Symbol-link file system, with test that the target of the link exists.
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 /* forward declarations */
53 static int amfs_linkx_mount(am_node *mp, mntfs *mf);
54 static int amfs_linkx_umount(am_node *mp, mntfs *mf);
55
56 /*
57 * linkx operations
58 */
59 struct am_ops amfs_linkx_ops =
60 {
61 "linkx",
62 amfs_link_match,
63 0, /* amfs_linkx_init */
64 amfs_linkx_mount,
65 amfs_linkx_umount,
66 amfs_error_lookup_child,
67 amfs_error_mount_child,
68 amfs_error_readdir,
69 0, /* amfs_linkx_readlink */
70 0, /* amfs_linkx_mounted */
71 0, /* amfs_linkx_umounted */
72 amfs_generic_find_srvr,
73 0, /* amfs_linkx_get_wchan */
74 FS_MBACKGROUND,
75 #ifdef HAVE_FS_AUTOFS
76 AUTOFS_LINKX_FS_FLAGS,
77 #endif /* HAVE_FS_AUTOFS */
78 };
79
80
81 static int
amfs_linkx_mount(am_node * mp,mntfs * mf)82 amfs_linkx_mount(am_node *mp, mntfs *mf)
83 {
84 /*
85 * Check for existence of target.
86 */
87 struct stat stb;
88 char *ln;
89
90 if (mp->am_link)
91 ln = mp->am_link;
92 else /* should never occur */
93 ln = mf->mf_mount;
94
95 /*
96 * Use lstat, not stat, since we don't
97 * want to know if the ultimate target of
98 * a symlink chain exists, just the first.
99 */
100 if (lstat(ln, &stb) < 0)
101 return errno;
102
103 return 0;
104 }
105
106
107 static int
amfs_linkx_umount(am_node * mp,mntfs * mf)108 amfs_linkx_umount(am_node *mp, mntfs *mf)
109 {
110 return 0;
111 }
112