1 /* $NetBSD: ops_lofs.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/ops_lofs.c 43 * 44 */ 45 46 /* 47 * Loopback 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 /* forward definitions */ 57 static char *lofs_match(am_opts *fo); 58 static int lofs_mount(am_node *am, mntfs *mf); 59 static int lofs_umount(am_node *am, mntfs *mf); 60 61 /* 62 * Ops structure 63 */ 64 am_ops lofs_ops = 65 { 66 "lofs", 67 lofs_match, 68 0, /* lofs_init */ 69 lofs_mount, 70 lofs_umount, 71 amfs_error_lookup_child, 72 amfs_error_mount_child, 73 amfs_error_readdir, 74 0, /* lofs_readlink */ 75 0, /* lofs_mounted */ 76 0, /* lofs_umounted */ 77 amfs_generic_find_srvr, 78 0, /* lofs_get_wchan */ 79 FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO, /* nfs_fs_flags */ 80 #ifdef HAVE_FS_AUTOFS 81 AUTOFS_LOFS_FS_FLAGS, 82 #endif /* HAVE_FS_AUTOFS */ 83 }; 84 85 86 /* 87 * LOFS needs remote filesystem. 88 */ 89 static char * 90 lofs_match(am_opts *fo) 91 { 92 if (!fo->opt_rfs) { 93 plog(XLOG_USER, "lofs: no source filesystem specified"); 94 return 0; 95 } 96 dlog("LOFS: mounting fs \"%s\" on \"%s\"", 97 fo->opt_rfs, fo->opt_fs); 98 99 /* 100 * Determine magic cookie to put in mtab 101 */ 102 return strdup(fo->opt_rfs); 103 } 104 105 106 int 107 mount_lofs(char *mntdir, char *fs_name, char *opts, int on_autofs) 108 { 109 mntent_t mnt; 110 int flags; 111 112 /* 113 * Figure out the name of the file system type. 114 */ 115 MTYPE_TYPE type = MOUNT_TYPE_LOFS; 116 117 /* 118 * Fill in the mount structure 119 */ 120 memset((voidp) &mnt, 0, sizeof(mnt)); 121 mnt.mnt_dir = mntdir; 122 mnt.mnt_fsname = fs_name; 123 mnt.mnt_type = MNTTAB_TYPE_LOFS; 124 mnt.mnt_opts = opts; 125 126 flags = compute_mount_flags(&mnt); 127 #ifdef HAVE_FS_AUTOFS 128 if (on_autofs) 129 flags |= autofs_compute_mount_flags(&mnt); 130 #endif /* HAVE_FS_AUTOFS */ 131 132 /* 133 * Call generic mount routine 134 */ 135 return mount_fs(&mnt, flags, NULL, 0, type, 0, NULL, mnttab_file_name, on_autofs); 136 } 137 138 139 static int 140 lofs_mount(am_node *am, mntfs *mf) 141 { 142 int on_autofs = mf->mf_flags & MFF_ON_AUTOFS; 143 int error; 144 145 error = mount_lofs(mf->mf_mount, mf->mf_info, mf->mf_mopts, on_autofs); 146 if (error) { 147 errno = error; 148 plog(XLOG_ERROR, "mount_lofs: %m"); 149 return error; 150 } 151 return 0; 152 } 153 154 155 static int 156 lofs_umount(am_node *am, mntfs *mf) 157 { 158 int unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0; 159 160 return UMOUNT_FS(mf->mf_mount, mnttab_file_name, unmount_flags); 161 } 162