1 /* $NetBSD: amfs_linkx.c,v 1.1.1.2 2009/03/20 20:26:49 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2009 Erez Zadok 5 * Copyright (c) 1990 Jan-Simon Pendry 6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine 7 * Copyright (c) 1990 The Regents of the University of California. 8 * All rights reserved. 9 * 10 * This code is derived from software contributed to Berkeley by 11 * Jan-Simon Pendry at Imperial College, London. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgment: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * 42 * File: am-utils/amd/amfs_linkx.c 43 * 44 */ 45 46 /* 47 * Symbol-link file system, with test that the target of the link exists. 48 */ 49 50 #ifdef HAVE_CONFIG_H 51 # include <config.h> 52 #endif /* HAVE_CONFIG_H */ 53 #include <am_defs.h> 54 #include <amd.h> 55 56 /* forward declarations */ 57 static int amfs_linkx_mount(am_node *mp, mntfs *mf); 58 static int amfs_linkx_umount(am_node *mp, mntfs *mf); 59 60 /* 61 * linkx operations 62 */ 63 struct am_ops amfs_linkx_ops = 64 { 65 "linkx", 66 amfs_link_match, 67 0, /* amfs_linkx_init */ 68 amfs_linkx_mount, 69 amfs_linkx_umount, 70 amfs_error_lookup_child, 71 amfs_error_mount_child, 72 amfs_error_readdir, 73 0, /* amfs_linkx_readlink */ 74 0, /* amfs_linkx_mounted */ 75 0, /* amfs_linkx_umounted */ 76 amfs_generic_find_srvr, 77 0, /* amfs_linkx_get_wchan */ 78 FS_MBACKGROUND, 79 #ifdef HAVE_FS_AUTOFS 80 AUTOFS_LINKX_FS_FLAGS, 81 #endif /* HAVE_FS_AUTOFS */ 82 }; 83 84 85 static int 86 amfs_linkx_mount(am_node *mp, mntfs *mf) 87 { 88 /* 89 * Check for existence of target. 90 */ 91 struct stat stb; 92 char *ln; 93 94 if (mp->am_link) 95 ln = mp->am_link; 96 else /* should never occur */ 97 ln = mf->mf_mount; 98 99 /* 100 * Use lstat, not stat, since we don't 101 * want to know if the ultimate target of 102 * a symlink chain exists, just the first. 103 */ 104 if (lstat(ln, &stb) < 0) 105 return errno; 106 107 return 0; 108 } 109 110 111 static int 112 amfs_linkx_umount(am_node *mp, mntfs *mf) 113 { 114 return 0; 115 } 116