2 * Copyright (c) 1997-1999 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. 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.
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
41 * $Id: amfs_link.c,v 1.2 1999/01/10 21:53:42 ezk Exp $
46 * Symbol-link file system
51 #endif /* HAVE_CONFIG_H */
59 am_ops amfs_link_ops =
63 0, /* amfs_link_init */
70 0, /* amfs_link_readlink */
71 0, /* amfs_link_mounted */
72 0, /* amfs_link_umounted */
82 amfs_link_match(am_opts *fo)
86 plog(XLOG_USER, "link: no fs specified");
91 * Bug report (14/12/89) from Jay Plett <jay@princeton.edu>
92 * If an automount point has the same name as an existing
93 * link type mount Amd hits a race condition and either hangs
94 * or causes a symlink loop.
96 * If fs begins with a '/' change the opt_fs & opt_sublink
97 * fields so that the fs option doesn't end up pointing at
98 * an existing symlink.
100 * If sublink is nil then set sublink to fs
101 * else set sublink to fs / sublink
103 * Finally set fs to ".".
105 if (*fo->opt_fs == '/') {
107 char *link = fo->opt_sublink;
110 fullpath = strdup(link);
112 fullpath = str3cat((char *) 0, fo->opt_fs, "/", link);
114 fullpath = strdup(fo->opt_fs);
118 XFREE(fo->opt_sublink);
119 fo->opt_sublink = fullpath;
120 fo->opt_fs = str3cat(fo->opt_fs, ".", fullpath, "");
123 return strdup(fo->opt_fs);
128 amfs_link_fmount(mntfs *mf)
131 * Wow - this is hard to implement! :-)
138 amfs_link_fumount(mntfs *mf)