1/* 2 * Copyright (c) 1997-2006 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. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgment: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * 40 * File: am-utils/amd/ops_lofs.c 41 * 42 */ 43 44/* 45 * Loopback file system 46 */ 47 48#ifdef HAVE_CONFIG_H 49# include <config.h> 50#endif /* HAVE_CONFIG_H */ 51#include <am_defs.h> 52#include <amd.h> 53 54/* forward definitions */ 55static char *lofs_match(am_opts *fo); 56static int lofs_mount(am_node *am, mntfs *mf); 57static int lofs_umount(am_node *am, mntfs *mf); 58 59/* 60 * Ops structure 61 */ 62am_ops lofs_ops = 63{ 64 "lofs", 65 lofs_match, 66 0, /* lofs_init */ 67 lofs_mount, 68 lofs_umount, 69 amfs_error_lookup_child, 70 amfs_error_mount_child, 71 amfs_error_readdir, 72 0, /* lofs_readlink */ 73 0, /* lofs_mounted */ 74 0, /* lofs_umounted */ 75 amfs_generic_find_srvr, 76 0, /* lofs_get_wchan */ 77 FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO, /* nfs_fs_flags */ 78#ifdef HAVE_FS_AUTOFS 79 AUTOFS_LOFS_FS_FLAGS, 80#endif /* HAVE_FS_AUTOFS */ 81}; 82 83 84/* 85 * LOFS needs remote filesystem. 86 */ 87static char * 88lofs_match(am_opts *fo) 89{ 90 if (!fo->opt_rfs) { 91 plog(XLOG_USER, "lofs: no source filesystem specified"); 92 return 0; 93 } 94 dlog("LOFS: mounting fs \"%s\" on \"%s\"", 95 fo->opt_rfs, fo->opt_fs); 96 97 /* 98 * Determine magic cookie to put in mtab 99 */ 100 return strdup(fo->opt_rfs); 101} 102 103 104int 105mount_lofs(char *mntdir, char *fs_name, char *opts, int on_autofs) 106{ 107 mntent_t mnt; 108 int flags; 109 110 /* 111 * Figure out the name of the file system type. 112 */ 113 MTYPE_TYPE type = MOUNT_TYPE_LOFS; 114 115 /* 116 * Fill in the mount structure 117 */ 118 memset((voidp) &mnt, 0, sizeof(mnt)); 119 mnt.mnt_dir = mntdir; 120 mnt.mnt_fsname = fs_name; 121 mnt.mnt_type = MNTTAB_TYPE_LOFS; 122 mnt.mnt_opts = opts; 123 124 flags = compute_mount_flags(&mnt); 125#ifdef HAVE_FS_AUTOFS 126 if (on_autofs) 127 flags |= autofs_compute_mount_flags(&mnt); 128#endif /* HAVE_FS_AUTOFS */ 129 130 /* 131 * Call generic mount routine 132 */ 133 return mount_fs(&mnt, flags, NULL, 0, type, 0, NULL, mnttab_file_name, on_autofs); 134} 135 136 137static int 138lofs_mount(am_node *am, mntfs *mf) 139{ 140 int on_autofs = mf->mf_flags & MFF_ON_AUTOFS; 141 int error; 142 143 error = mount_lofs(mf->mf_mount, mf->mf_info, mf->mf_mopts, on_autofs); 144 if (error) { 145 errno = error; 146 plog(XLOG_ERROR, "mount_lofs: %m"); 147 return error; 148 } 149 return 0; 150} 151 152 153static int 154lofs_umount(am_node *am, mntfs *mf) 155{ 156 int unmount_flags = (mf->mf_flags & MFF_ON_AUTOFS) ? AMU_UMOUNT_AUTOFS : 0; 157 158 return UMOUNT_FS(mf->mf_mount, mnttab_file_name, unmount_flags); 159} 160