1 /* $NetBSD: ops_lofs.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2014 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. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * 38 * File: am-utils/amd/ops_lofs.c 39 * 40 */ 41 42 /* 43 * Loopback file system 44 */ 45 46 #ifdef HAVE_CONFIG_H 47 # include <config.h> 48 #endif /* HAVE_CONFIG_H */ 49 #include <am_defs.h> 50 #include <amd.h> 51 52 /* forward definitions */ 53 static char *lofs_match(am_opts *fo); 54 static int lofs_mount(am_node *am, mntfs *mf); 55 static int lofs_umount(am_node *am, mntfs *mf); 56 57 /* 58 * Ops structure 59 */ 60 am_ops lofs_ops = 61 { 62 "lofs", 63 lofs_match, 64 0, /* lofs_init */ 65 lofs_mount, 66 lofs_umount, 67 amfs_error_lookup_child, 68 amfs_error_mount_child, 69 amfs_error_readdir, 70 0, /* lofs_readlink */ 71 0, /* lofs_mounted */ 72 0, /* lofs_umounted */ 73 amfs_generic_find_srvr, 74 0, /* lofs_get_wchan */ 75 FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO, /* nfs_fs_flags */ 76 #ifdef HAVE_FS_AUTOFS 77 AUTOFS_LOFS_FS_FLAGS, 78 #endif /* HAVE_FS_AUTOFS */ 79 }; 80 81 82 /* 83 * LOFS needs remote filesystem. 84 */ 85 static char * 86 lofs_match(am_opts *fo) 87 { 88 if (!fo->opt_rfs) { 89 plog(XLOG_USER, "lofs: no source filesystem specified"); 90 return 0; 91 } 92 dlog("LOFS: mounting fs \"%s\" on \"%s\"", 93 fo->opt_rfs, fo->opt_fs); 94 95 /* 96 * Determine magic cookie to put in mtab 97 */ 98 return xstrdup(fo->opt_rfs); 99 } 100 101 102 int 103 mount_lofs(char *mntdir, char *fs_name, char *opts, int on_autofs) 104 { 105 mntent_t mnt; 106 int flags; 107 108 /* 109 * Figure out the name of the file system type. 110 */ 111 MTYPE_TYPE type = MOUNT_TYPE_LOFS; 112 113 /* 114 * Fill in the mount structure 115 */ 116 memset((voidp) &mnt, 0, sizeof(mnt)); 117 mnt.mnt_dir = mntdir; 118 mnt.mnt_fsname = fs_name; 119 mnt.mnt_type = MNTTAB_TYPE_LOFS; 120 mnt.mnt_opts = opts; 121 122 flags = compute_mount_flags(&mnt); 123 #ifdef HAVE_FS_AUTOFS 124 if (on_autofs) 125 flags |= autofs_compute_mount_flags(&mnt); 126 #endif /* HAVE_FS_AUTOFS */ 127 128 /* 129 * Call generic mount routine 130 */ 131 return mount_fs(&mnt, flags, NULL, 0, type, 0, NULL, mnttab_file_name, on_autofs); 132 } 133 134 135 static int 136 lofs_mount(am_node *am, mntfs *mf) 137 { 138 int on_autofs = mf->mf_flags & MFF_ON_AUTOFS; 139 int error; 140 141 error = mount_lofs(mf->mf_mount, mf->mf_info, mf->mf_mopts, on_autofs); 142 if (error) { 143 errno = error; 144 plog(XLOG_ERROR, "mount_lofs: %m"); 145 return error; 146 } 147 return 0; 148 } 149 150 151 static int 152 lofs_umount(am_node *am, mntfs *mf) 153 { 154 int unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0; 155 156 return UMOUNT_FS(mf->mf_mount, mnttab_file_name, unmount_flags); 157 } 158