/* $NetBSD: amfs_link.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */
/*
* Copyright (c) 1997-2014 Erez Zadok
* Copyright (c) 1990 Jan-Simon Pendry
* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry at Imperial College, London.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*
* File: am-utils/amd/amfs_link.c
*
*/
/*
* Symbol-link file system
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <amd.h>
/* forward declarations */
static int amfs_link_mount(am_node *mp, mntfs *mf);
static int amfs_link_umount(am_node *mp, mntfs *mf);
/*
* Ops structures
*/
am_ops amfs_link_ops =
{
"link",
amfs_link_match,
0, /* amfs_link_init */
amfs_link_mount,
amfs_link_umount,
amfs_error_lookup_child,
amfs_error_mount_child,
amfs_error_readdir,
0, /* amfs_link_readlink */
0, /* amfs_link_mounted */
0, /* amfs_link_umounted */
amfs_generic_find_srvr,
0, /* nfs_fs_flags */
0, /* amfs_link_get_wchan */
#ifdef HAVE_FS_AUTOFS
AUTOFS_LINK_FS_FLAGS,
#endif /* HAVE_FS_AUTOFS */
};
/*
* SFS needs a link.
*/
char *
amfs_link_match(am_opts *fo)
{
if (!fo->opt_fs) {
plog(XLOG_USER, "link: no fs specified");
return 0;
}
/*
* If the link target points to another mount point, then we could
* end up with an unpleasant situation, where the link f/s simply
* "assumes" the mntfs of that mount point.
*
* For example, if the link points to /usr, and /usr is a real ufs
* filesystem, then the link f/s will use the inherited ufs mntfs,
* and the end result will be that it will become unmountable.
*
* To prevent this, we use a hack: we prepend a dot ('.') to opt_fs if
* its original value was an absolute path, so that it will never match
* any other mntfs.
*
* XXX: a less hacky solution should be used...
*/
if (fo->opt_fs[0] == '/') {
char *link_hack = str3cat(NULL, ".", fo->opt_fs, "");
if (fo->opt_sublink == NULL || fo->opt_sublink[0] == '\0')
fo->opt_sublink = xstrdup(fo->opt_fs);
XFREE(fo->opt_fs);
fo->opt_fs = link_hack;
}
return xstrdup(fo->opt_fs);
}
static int
amfs_link_mount(am_node *mp, mntfs *mf)
{
return 0;
}
static int
amfs_link_umount(am_node *mp, mntfs *mf)
{
return 0;
}
