/* * Copyright (c) 2000-2003 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* $NetBSD: cd9660_bmap.c,v 1.5 1994/12/13 22:33:12 mycroft Exp $ */ /*- * Copyright (c) 1994 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension * Support code is derived from software contributed to Berkeley * by Atsushi Murai (amurai@spec.co.jp). * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)cd9660_bmap.c 8.4 (Berkeley) 12/5/94 */ #include <sys/param.h> #include <sys/vnode.h> #include <sys/mount.h> #include <sys/namei.h> #include <sys/buf.h> #include <sys/file.h> #include <isofs/cd9660/iso.h> #include <isofs/cd9660/cd9660_node.h> /* * Bmap converts the logical block number of a file to its physical block * number on the disk. The conversion is done by using the logical block * number to index into the data block (extent) for the file. */ int cd9660_bmap(ap) struct vop_bmap_args /* { struct vnode *a_vp; daddr_t a_bn; struct vnode **a_vpp; daddr_t *a_bnp; int *a_runp; } */ *ap; { struct iso_node *ip = VTOI(ap->a_vp); daddr_t lblkno = ap->a_bn; int bshift; /* * Check for underlying vnode requests and ensure that logical * to physical mapping is requested. */ if (ap->a_vpp != NULL) *ap->a_vpp = ip->i_devvp; if (ap->a_bnp == NULL) return (0); /* * Associated files have an Apple Double header */ if ((ip->i_flag & ISO_ASSOCIATED) && (lblkno > (ADH_BLKS - 1))) { lblkno -= ADH_BLKS; *ap->a_bnp = (ip->iso_start + lblkno); if (ap->a_runp) *ap->a_runp = 0; return (0); } /* * Compute the requested block number */ bshift = ip->i_mnt->im_bshift; *ap->a_bnp = (ip->iso_start + lblkno); /* * Determine maximum number of readahead blocks following the * requested block. */ if (ap->a_runp) { int nblk; nblk = (ip->i_size >> bshift) - (lblkno + 1); if (nblk <= 0) *ap->a_runp = 0; else if (nblk >= (MAXBSIZE >> bshift)) *ap->a_runp = (MAXBSIZE >> bshift) - 1; else *ap->a_runp = nblk; } return (0); } /* blktooff converts a logical block number to a file offset */ int cd9660_blktooff(ap) struct vop_blktooff_args /* { struct vnode *a_vp; daddr_t a_lblkno; off_t *a_offset; } */ *ap; { register struct iso_node *ip; register struct iso_mnt *imp; if (ap->a_vp == NULL) return (EINVAL); ip = VTOI(ap->a_vp); imp = ip->i_mnt; *ap->a_offset = (off_t)lblktosize(imp, ap->a_lblkno); return (0); } /* offtoblk converts a file offset to a logical block number */ int cd9660_offtoblk(ap) struct vop_offtoblk_args /* { struct vnode *a_vp; off_t a_offset; daddr_t *a_lblkno; } */ *ap; { register struct iso_node *ip; register struct iso_mnt *imp; if (ap->a_vp == NULL) return (EINVAL); ip = VTOI(ap->a_vp); imp = ip->i_mnt; *ap->a_lblkno = (daddr_t)lblkno(imp, ap->a_offset); return (0); } int cd9660_cmap(ap) struct vop_cmap_args /* { struct vnode *a_vp; off_t a_offset; size_t a_size; daddr_t *a_bpn; size_t *a_run; void *a_poff; } */ *ap; { struct iso_node *ip = VTOI(ap->a_vp); size_t cbytes; int devBlockSize = 0; off_t offset = ap->a_foffset; /* * Check for underlying vnode requests and ensure that logical * to physical mapping is requested. */ if (ap->a_bpn == NULL) return (0); VOP_DEVBLOCKSIZE(ip->i_devvp, &devBlockSize); /* * Associated files have an Apple Double header */ if (ip->i_flag & ISO_ASSOCIATED) { if (offset < ADH_SIZE) { if (ap->a_run) *ap->a_run = 0; *ap->a_bpn = -1; goto out; } else { offset -= ADH_SIZE; } } *ap->a_bpn = (daddr_t)(ip->iso_start + lblkno(ip->i_mnt, offset)); /* * Determine maximum number of contiguous bytes following the * requested offset. */ if (ap->a_run) { if (ip->i_size > offset) cbytes = ip->i_size - offset; else cbytes = 0; cbytes = (cbytes + (devBlockSize - 1)) & ~(devBlockSize - 1); *ap->a_run = MIN(cbytes, ap->a_size); }; out: if (ap->a_poff) *(int *)ap->a_poff = (long)offset & (devBlockSize - 1); return (0); }