1/* 2 * Copyright (c) 1997-2014 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. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * 36 * File: am-utils/amd/amfs_linkx.c 37 * 38 */ 39 40/* 41 * Symbol-link file system, with test that the target of the link exists. 42 */ 43 44#ifdef HAVE_CONFIG_H 45# include <config.h> 46#endif /* HAVE_CONFIG_H */ 47#include <am_defs.h> 48#include <amd.h> 49 50/* forward declarations */ 51static int amfs_linkx_mount(am_node *mp, mntfs *mf); 52static int amfs_linkx_umount(am_node *mp, mntfs *mf); 53 54/* 55 * linkx operations 56 */ 57struct am_ops amfs_linkx_ops = 58{ 59 "linkx", 60 amfs_link_match, 61 0, /* amfs_linkx_init */ 62 amfs_linkx_mount, 63 amfs_linkx_umount, 64 amfs_error_lookup_child, 65 amfs_error_mount_child, 66 amfs_error_readdir, 67 0, /* amfs_linkx_readlink */ 68 0, /* amfs_linkx_mounted */ 69 0, /* amfs_linkx_umounted */ 70 amfs_generic_find_srvr, 71 0, /* amfs_linkx_get_wchan */ 72 FS_MBACKGROUND, 73#ifdef HAVE_FS_AUTOFS 74 AUTOFS_LINKX_FS_FLAGS, 75#endif /* HAVE_FS_AUTOFS */ 76}; 77 78 79static int 80amfs_linkx_mount(am_node *mp, mntfs *mf) 81{ 82 /* 83 * Check for existence of target. 84 */ 85 struct stat stb; 86 char *ln; 87 88 if (mp->am_link) 89 ln = mp->am_link; 90 else /* should never occur */ 91 ln = mf->mf_mount; 92 93 /* 94 * Use lstat, not stat, since we don't 95 * want to know if the ultimate target of 96 * a symlink chain exists, just the first. 97 */ 98 if (lstat(ln, &stb) < 0) 99 return errno; 100 101 return 0; 102} 103 104 105static int 106amfs_linkx_umount(am_node *mp, mntfs *mf) 107{ 108 return 0; 109} 110