ops_lofs.c revision 51292
1/* 2 * Copyright (c) 1997-1999 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 * %W% (Berkeley) %G% 40 * 41 * $Id: ops_lofs.c,v 1.2 1999/01/10 21:53:49 ezk Exp $ 42 * 43 */ 44 45/* 46 * Loopback file system 47 */ 48 49#ifdef HAVE_CONFIG_H 50# include <config.h> 51#endif /* HAVE_CONFIG_H */ 52#include <am_defs.h> 53#include <amd.h> 54 55/* forward definitions */ 56static char * lofs_match(am_opts *fo); 57static int lofs_fmount(mntfs *mf); 58static int lofs_fumount(mntfs *mf); 59static int mount_lofs(char *dir, char *fs_name, char *opts); 60 61 62/* 63 * Ops structure 64 */ 65am_ops lofs_ops = 66{ 67 "lofs", 68 lofs_match, 69 0, /* lofs_init */ 70 amfs_auto_fmount, 71 lofs_fmount, 72 amfs_auto_fumount, 73 lofs_fumount, 74 amfs_error_lookuppn, 75 amfs_error_readdir, 76 0, /* lofs_readlink */ 77 0, /* lofs_mounted */ 78 0, /* lofs_umounted */ 79 find_amfs_auto_srvr, 80 FS_MKMNT | FS_NOTIMEOUT | FS_UBACKGROUND | FS_AMQINFO 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#ifdef DEBUG 95 dlog("LOFS: mounting fs \"%s\" on \"%s\"", 96 fo->opt_rfs, fo->opt_fs); 97#endif /* DEBUG */ 98 99 /* 100 * Determine magic cookie to put in mtab 101 */ 102 return strdup(fo->opt_rfs); 103} 104 105 106static int 107mount_lofs(char *dir, char *fs_name, char *opts) 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 = dir; 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); 127 128 /* 129 * Call generic mount routine 130 */ 131 return mount_fs(&mnt, flags, NULL, 0, type, 0, NULL, mnttab_file_name); 132} 133 134 135static int 136lofs_fmount(mntfs *mf) 137{ 138 int error; 139 140 error = mount_lofs(mf->mf_mount, mf->mf_info, mf->mf_mopts); 141 if (error) { 142 errno = error; 143 plog(XLOG_ERROR, "mount_lofs: %m"); 144 return error; 145 } 146 return 0; 147} 148 149 150static int 151lofs_fumount(mntfs *mf) 152{ 153 return UMOUNT_FS(mf->mf_mount, mnttab_file_name); 154} 155