1/* 2 * Copyright (c) 1997-2006 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. 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. 26 * 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 37 * SUCH DAMAGE. 38 * 39 * 40 * File: am-utils/amd/amfs_link.c 41 * 42 */ 43 44/* 45 * Symbol-link file system 46 */ 47 48#ifdef HAVE_CONFIG_H 49# include <config.h> 50#endif /* HAVE_CONFIG_H */ 51#include <am_defs.h> 52#include <amd.h> 53 54/* forward declarations */ 55static int amfs_link_mount(am_node *mp, mntfs *mf); 56static int amfs_link_umount(am_node *mp, mntfs *mf); 57 58/* 59 * Ops structures 60 */ 61am_ops amfs_link_ops = 62{ 63 "link", 64 amfs_link_match, 65 0, /* amfs_link_init */ 66 amfs_link_mount, 67 amfs_link_umount, 68 amfs_error_lookup_child, 69 amfs_error_mount_child, 70 amfs_error_readdir, 71 0, /* amfs_link_readlink */ 72 0, /* amfs_link_mounted */ 73 0, /* amfs_link_umounted */ 74 amfs_generic_find_srvr, 75 0, /* nfs_fs_flags */ 76 0, /* amfs_link_get_wchan */ 77#ifdef HAVE_FS_AUTOFS 78 AUTOFS_LINK_FS_FLAGS, 79#endif /* HAVE_FS_AUTOFS */ 80}; 81 82 83/* 84 * SFS needs a link. 85 */ 86char * 87amfs_link_match(am_opts *fo) 88{ 89 90 if (!fo->opt_fs) { 91 plog(XLOG_USER, "link: no fs specified"); 92 return 0; 93 } 94 95 /* 96 * If the link target points to another mount point, then we could 97 * end up with an unpleasant situation, where the link f/s simply 98 * "assumes" the mntfs of that mount point. 99 * 100 * For example, if the link points to /usr, and /usr is a real ufs 101 * filesystem, then the link f/s will use the inherited ufs mntfs, 102 * and the end result will be that it will become unmountable. 103 * 104 * To prevent this, we use a hack: we prepend a dot ('.') to opt_fs if 105 * its original value was an absolute path, so that it will never match 106 * any other mntfs. 107 * 108 * XXX: a less hacky solution should be used... 109 */ 110 if (fo->opt_fs[0] == '/') { 111 char *link_hack = str3cat(NULL, ".", fo->opt_fs, ""); 112 if (!fo->opt_sublink) 113 fo->opt_sublink = strdup(fo->opt_fs); 114 XFREE(fo->opt_fs); 115 fo->opt_fs = link_hack; 116 } 117 118 return strdup(fo->opt_fs); 119} 120 121 122static int 123amfs_link_mount(am_node *mp, mntfs *mf) 124{ 125 return 0; 126} 127 128 129static int 130amfs_link_umount(am_node *mp, mntfs *mf) 131{ 132 return 0; 133} 134