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_link.c
41 *
42 */
43
44/*
45 * Symbol-link 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/* forward declarations */
55static int amfs_link_mount(am_node *mp, mntfs *mf);
56static int amfs_link_umount(am_node *mp, mntfs *mf);
57
58/*
59 * Ops structures
60 */
61am_ops amfs_link_ops =
62{
63  "link",
64  amfs_link_match,
65  0,				/* amfs_link_init */
66  amfs_link_mount,
67  amfs_link_umount,
68  amfs_error_lookup_child,
69  amfs_error_mount_child,
70  amfs_error_readdir,
71  0,				/* amfs_link_readlink */
72  0,				/* amfs_link_mounted */
73  0,				/* amfs_link_umounted */
74  amfs_generic_find_srvr,
75  0,				/* nfs_fs_flags */
76  0,				/* amfs_link_get_wchan */
77#ifdef HAVE_FS_AUTOFS
78  AUTOFS_LINK_FS_FLAGS,
79#endif /* HAVE_FS_AUTOFS */
80};
81
82
83/*
84 * SFS needs a link.
85 */
86char *
87amfs_link_match(am_opts *fo)
88{
89
90  if (!fo->opt_fs) {
91    plog(XLOG_USER, "link: no fs specified");
92    return 0;
93  }
94
95  /*
96   * If the link target points to another mount point, then we could
97   * end up with an unpleasant situation, where the link f/s simply
98   * "assumes" the mntfs of that mount point.
99   *
100   * For example, if the link points to /usr, and /usr is a real ufs
101   * filesystem, then the link f/s will use the inherited ufs mntfs,
102   * and the end result will be that it will become unmountable.
103   *
104   * To prevent this, we use a hack: we prepend a dot ('.') to opt_fs if
105   * its original value was an absolute path, so that it will never match
106   * any other mntfs.
107   *
108   * XXX: a less hacky solution should be used...
109   */
110  if (fo->opt_fs[0] == '/') {
111    char *link_hack = str3cat(NULL, ".", fo->opt_fs, "");
112    if (!fo->opt_sublink)
113      fo->opt_sublink = strdup(fo->opt_fs);
114    XFREE(fo->opt_fs);
115    fo->opt_fs = link_hack;
116  }
117
118  return strdup(fo->opt_fs);
119}
120
121
122static int
123amfs_link_mount(am_node *mp, mntfs *mf)
124{
125  return 0;
126}
127
128
129static int
130amfs_link_umount(am_node *mp, mntfs *mf)
131{
132  return 0;
133}
134