/* $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 #endif /* HAVE_CONFIG_H */ #include #include /* 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; }