1/*
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.
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. 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.
22 *
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
33 * SUCH DAMAGE.
34 *
35 *
36 * File: am-utils/amd/amfs_linkx.c
37 *
38 */
39
40/*
41 * Symbol-link file system, with test that the target of the link exists.
42 */
43
44#ifdef HAVE_CONFIG_H
45# include <config.h>
46#endif /* HAVE_CONFIG_H */
47#include <am_defs.h>
48#include <amd.h>
49
50/* forward declarations */
51static int amfs_linkx_mount(am_node *mp, mntfs *mf);
52static int amfs_linkx_umount(am_node *mp, mntfs *mf);
53
54/*
55 * linkx operations
56 */
57struct am_ops amfs_linkx_ops =
58{
59  "linkx",
60  amfs_link_match,
61  0,				/* amfs_linkx_init */
62  amfs_linkx_mount,
63  amfs_linkx_umount,
64  amfs_error_lookup_child,
65  amfs_error_mount_child,
66  amfs_error_readdir,
67  0,				/* amfs_linkx_readlink */
68  0,				/* amfs_linkx_mounted */
69  0,				/* amfs_linkx_umounted */
70  amfs_generic_find_srvr,
71  0,				/* amfs_linkx_get_wchan */
72  FS_MBACKGROUND,
73#ifdef HAVE_FS_AUTOFS
74  AUTOFS_LINKX_FS_FLAGS,
75#endif /* HAVE_FS_AUTOFS */
76};
77
78
79static int
80amfs_linkx_mount(am_node *mp, mntfs *mf)
81{
82  /*
83   * Check for existence of target.
84   */
85  struct stat stb;
86  char *ln;
87
88  if (mp->am_link)
89    ln = mp->am_link;
90  else				/* should never occur */
91    ln = mf->mf_mount;
92
93  /*
94   * Use lstat, not stat, since we don't
95   * want to know if the ultimate target of
96   * a symlink chain exists, just the first.
97   */
98  if (lstat(ln, &stb) < 0)
99    return errno;
100
101  return 0;
102}
103
104
105static int
106amfs_linkx_umount(am_node *mp, mntfs *mf)
107{
108  return 0;
109}
110