1 /* $NetBSD: amfs_auto.c,v 1.1.1.2 2009/03/20 20:26:48 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_auto.c 43 * 44 */ 45 46 /* 47 * Automount file system 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 /**************************************************************************** 57 *** MACROS *** 58 ****************************************************************************/ 59 60 61 /**************************************************************************** 62 *** STRUCTURES *** 63 ****************************************************************************/ 64 65 66 /**************************************************************************** 67 *** FORWARD DEFINITIONS *** 68 ****************************************************************************/ 69 static int amfs_auto_mount(am_node *mp, mntfs *mf); 70 71 72 /**************************************************************************** 73 *** OPS STRUCTURES *** 74 ****************************************************************************/ 75 am_ops amfs_auto_ops = 76 { 77 "auto", 78 amfs_generic_match, 79 0, /* amfs_auto_init */ 80 amfs_auto_mount, 81 amfs_generic_umount, 82 amfs_generic_lookup_child, 83 amfs_generic_mount_child, 84 amfs_generic_readdir, 85 0, /* amfs_auto_readlink */ 86 amfs_generic_mounted, 87 0, /* amfs_auto_umounted */ 88 amfs_generic_find_srvr, 89 0, /* amfs_auto_get_wchan */ 90 FS_AMQINFO | FS_DIRECTORY, 91 #ifdef HAVE_FS_AUTOFS 92 AUTOFS_AUTO_FS_FLAGS, 93 #endif /* HAVE_FS_AUTOFS */ 94 }; 95 96 97 /**************************************************************************** 98 *** FUNCTIONS *** 99 ****************************************************************************/ 100 /* 101 * Mount a sub-mount 102 */ 103 static int 104 amfs_auto_mount(am_node *mp, mntfs *mf) 105 { 106 /* 107 * Pseudo-directories are used to provide some structure 108 * to the automounted directories instead 109 * of putting them all in the top-level automount directory. 110 * 111 * Here, just increment the parent's link count. 112 */ 113 mp->am_parent->am_fattr.na_nlink++; 114 115 /* 116 * Info field of . means use parent's info field. 117 * Historical - not documented. 118 */ 119 if (mf->mf_info[0] == '.' && mf->mf_info[1] == '\0') 120 mf->mf_info = strealloc(mf->mf_info, mp->am_parent->am_mnt->mf_info); 121 122 /* 123 * Compute prefix: 124 * 125 * If there is an option prefix then use that else 126 * If the parent had a prefix then use that with name 127 * of this node appended else 128 * Use the name of this node. 129 * 130 * That means if you want no prefix you must say so 131 * in the map. 132 */ 133 if (mf->mf_fo->opt_pref) { 134 /* allow pref:=null to set a real null prefix */ 135 if (STREQ(mf->mf_fo->opt_pref, "null")) { 136 mp->am_pref = strdup(""); 137 } else { 138 /* 139 * the prefix specified as an option 140 */ 141 mp->am_pref = strdup(mf->mf_fo->opt_pref); 142 } 143 } else { 144 /* 145 * else the parent's prefix 146 * followed by the name 147 * followed by / 148 */ 149 char *ppref = mp->am_parent->am_pref; 150 if (ppref == 0) 151 ppref = ""; 152 mp->am_pref = str3cat((char *) NULL, ppref, mp->am_name, "/"); 153 } 154 155 #ifdef HAVE_FS_AUTOFS 156 if (mf->mf_flags & MFF_IS_AUTOFS) { 157 char opts[SIZEOF_OPTS]; 158 int error; 159 160 autofs_get_opts(opts, sizeof(opts), mp->am_autofs_fh); 161 162 /* now do the mount */ 163 error = amfs_mount(mp, mf, opts); 164 if (error) { 165 errno = error; 166 plog(XLOG_FATAL, "amfs_auto_mount: amfs_mount failed: %m"); 167 return error; 168 } 169 } 170 #endif /* HAVE_FS_AUTOFS */ 171 172 /* 173 * Attach a map cache 174 */ 175 amfs_mkcacheref(mf); 176 177 return 0; 178 } 179