136 lines
4.1 KiB
C
136 lines
4.1 KiB
C
/* $NetBSD: amfs_link.c,v 1.1.1.8 2005/04/23 18:09:19 christos Exp $ */
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/*
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* Copyright (c) 1997-2005 Erez Zadok
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* Copyright (c) 1990 Jan-Simon Pendry
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* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry at Imperial College, London.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgment:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*
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* Id: amfs_link.c,v 1.21 2005/01/03 20:56:45 ezk Exp
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*
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*/
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/*
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* Symbol-link file system
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif /* HAVE_CONFIG_H */
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#include <am_defs.h>
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#include <amd.h>
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/* forward declarations */
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static int amfs_link_mount(am_node *mp, mntfs *mf);
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static int amfs_link_umount(am_node *mp, mntfs *mf);
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/*
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* Ops structures
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*/
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am_ops amfs_link_ops =
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{
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"link",
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amfs_link_match,
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0, /* amfs_link_init */
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amfs_link_mount,
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amfs_link_umount,
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amfs_error_lookup_child,
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amfs_error_mount_child,
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amfs_error_readdir,
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0, /* amfs_link_readlink */
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0, /* amfs_link_mounted */
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0, /* amfs_link_umounted */
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amfs_generic_find_srvr,
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0, /* nfs_fs_flags */
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0, /* amfs_link_get_wchan */
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#ifdef HAVE_FS_AUTOFS
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AUTOFS_LINK_FS_FLAGS,
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#endif /* HAVE_FS_AUTOFS */
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};
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/*
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* SFS needs a link.
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*/
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char *
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amfs_link_match(am_opts *fo)
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{
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if (!fo->opt_fs) {
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plog(XLOG_USER, "link: no fs specified");
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return 0;
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}
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/*
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* If the link target points to another mount point, then we could
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* end up with an unpleasant situation, where the link f/s simply
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* "assumes" the mntfs of that mount point.
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*
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* For example, if the link points to /usr, and /usr is a real ufs
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* filesystem, then the link f/s will use the inherited ufs mntfs,
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* and the end result will be that it will become unmountable.
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*
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* To prevent this, we use a hack: we prepend a dot ('.') to opt_fs if
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* its original value was an absolute path, so that it will never match
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* any other mntfs.
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*
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* XXX: a less hacky solution should be used...
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*/
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if (fo->opt_fs[0] == '/') {
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char *link_hack = str3cat(NULL, ".", fo->opt_fs, "");
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if (!fo->opt_sublink)
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fo->opt_sublink = strdup(fo->opt_fs);
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XFREE(fo->opt_fs);
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fo->opt_fs = link_hack;
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}
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return strdup(fo->opt_fs);
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}
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static int
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amfs_link_mount(am_node *mp, mntfs *mf)
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{
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return 0;
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}
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static int
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amfs_link_umount(am_node *mp, mntfs *mf)
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{
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return 0;
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}
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