1/* 2 * Copyright (c) 2000-2003 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/* $NetBSD: cd9660_bmap.c,v 1.5 1994/12/13 22:33:12 mycroft Exp $ */ 29 30/*- 31 * Copyright (c) 1994 32 * The Regents of the University of California. All rights reserved. 33 * 34 * This code is derived from software contributed to Berkeley 35 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension 36 * Support code is derived from software contributed to Berkeley 37 * by Atsushi Murai (amurai@spec.co.jp). 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 3. All advertising materials mentioning features or use of this software 48 * must display the following acknowledgement: 49 * This product includes software developed by the University of 50 * California, Berkeley and its contributors. 51 * 4. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 * 67 * @(#)cd9660_bmap.c 8.4 (Berkeley) 12/5/94 68 */ 69 70#include <sys/param.h> 71#include <sys/vnode.h> 72#include <sys/mount.h> 73#include <sys/namei.h> 74#include <sys/file.h> 75 76#include <isofs/cd9660/iso.h> 77#include <isofs/cd9660/cd9660_node.h> 78 79 80/* blktooff converts a logical block number to a file offset */ 81int 82cd9660_blktooff(struct vnop_blktooff_args *ap) 83{ 84 register struct iso_node *ip; 85 register struct iso_mnt *imp; 86 87 if (ap->a_vp == NULL) 88 return (EINVAL); 89 90 ip = VTOI(ap->a_vp); 91 imp = ip->i_mnt; 92 93 *ap->a_offset = (off_t)lblktosize(imp, ap->a_lblkno); 94 return (0); 95} 96 97/* offtoblk converts a file offset to a logical block number */ 98int 99cd9660_offtoblk(struct vnop_offtoblk_args *ap) 100{ 101 register struct iso_node *ip; 102 register struct iso_mnt *imp; 103 104 if (ap->a_vp == NULL) 105 return (EINVAL); 106 107 ip = VTOI(ap->a_vp); 108 imp = ip->i_mnt; 109 110 *ap->a_lblkno = (daddr64_t)lblkno(imp, ap->a_offset); 111 return (0); 112} 113 114int 115cd9660_blockmap(struct vnop_blockmap_args *ap) 116{ 117 struct iso_node *ip = VTOI(ap->a_vp); 118 size_t cbytes; 119 int devBlockSize = 0; 120 off_t offset = ap->a_foffset; 121 122 /* 123 * Check for underlying vnode requests and ensure that logical 124 * to physical mapping is requested. 125 */ 126 if (ap->a_bpn == NULL) 127 return (0); 128 129 devBlockSize = vfs_devblocksize(vnode_mount(ap->a_vp)); 130 131 /* 132 * Associated files have an Apple Double header 133 */ 134 if (ip->i_flag & ISO_ASSOCIATED) { 135 if (offset < ADH_SIZE) { 136 if (ap->a_run) 137 *ap->a_run = 0; 138 *ap->a_bpn = (daddr64_t)-1; 139 goto out; 140 } else { 141 offset -= ADH_SIZE; 142 } 143 } 144 145 *ap->a_bpn = (daddr64_t)(ip->iso_start + lblkno(ip->i_mnt, offset)); 146 147 /* 148 * Determine maximum number of contiguous bytes following the 149 * requested offset. 150 */ 151 if (ap->a_run) { 152 if (ip->i_size > offset) 153 cbytes = ip->i_size - offset; 154 else 155 cbytes = 0; 156 157 cbytes = (cbytes + (devBlockSize - 1)) & ~(devBlockSize - 1); 158 159 *ap->a_run = MIN(cbytes, ap->a_size); 160 }; 161out: 162 if (ap->a_poff) 163 *(int *)ap->a_poff = (long)offset & (devBlockSize - 1); 164 165 return (0); 166} 167 168