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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* $NetBSD: cd9660_bmap.c,v 1.5 1994/12/13 22:33:12 mycroft Exp $ */
26:
27: /*-
28: * Copyright (c) 1994
29: * The Regents of the University of California. All rights reserved.
30: *
31: * This code is derived from software contributed to Berkeley
32: * by Pace Willisson ([email protected]). The Rock Ridge Extension
33: * Support code is derived from software contributed to Berkeley
34: * by Atsushi Murai ([email protected]).
35: *
36: * Redistribution and use in source and binary forms, with or without
37: * modification, are permitted provided that the following conditions
38: * are met:
39: * 1. Redistributions of source code must retain the above copyright
40: * notice, this list of conditions and the following disclaimer.
41: * 2. Redistributions in binary form must reproduce the above copyright
42: * notice, this list of conditions and the following disclaimer in the
43: * documentation and/or other materials provided with the distribution.
44: * 3. All advertising materials mentioning features or use of this software
45: * must display the following acknowledgement:
46: * This product includes software developed by the University of
47: * California, Berkeley and its contributors.
48: * 4. Neither the name of the University nor the names of its contributors
49: * may be used to endorse or promote products derived from this software
50: * without specific prior written permission.
51: *
52: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
53: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
54: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
55: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
56: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
57: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
58: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
59: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
60: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
61: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
62: * SUCH DAMAGE.
63: *
64: * @(#)cd9660_bmap.c 8.4 (Berkeley) 12/5/94
65: */
66:
67: #include <sys/param.h>
68: #include <sys/namei.h>
69: #include <sys/buf.h>
70: #include <sys/file.h>
71: #include <sys/vnode.h>
72: #include <sys/mount.h>
73:
74: #include <isofs/cd9660/iso.h>
75: #include <isofs/cd9660/cd9660_node.h>
76:
77: /*
78: * Bmap converts a the logical block number of a file to its physical block
79: * number on the disk. The conversion is done by using the logical block
80: * number to index into the data block (extent) for the file.
81: */
82: int
83: cd9660_bmap(ap)
84: struct vop_bmap_args /* {
85: struct vnode *a_vp;
86: daddr_t a_bn;
87: struct vnode **a_vpp;
88: daddr_t *a_bnp;
89: int *a_runp;
90: } */ *ap;
91: {
92: struct iso_node *ip = VTOI(ap->a_vp);
93: daddr_t lblkno = ap->a_bn;
94: int bshift;
95:
96: /*
97: * Check for underlying vnode requests and ensure that logical
98: * to physical mapping is requested.
99: */
100: if (ap->a_vpp != NULL)
101: *ap->a_vpp = ip->i_devvp;
102: if (ap->a_bnp == NULL)
103: return (0);
104:
105: /*
106: * Compute the requested block number
107: */
108: bshift = ip->i_mnt->im_bshift;
109: #if 1
110: *ap->a_bnp = (ip->iso_start + lblkno);
111: #else
112: *ap->a_bnp = (ip->iso_start + lblkno) << (bshift - DEV_BSHIFT);
113: #endif
114:
115: /*
116: * Determine maximum number of readahead blocks following the
117: * requested block.
118: */
119: if (ap->a_runp) {
120: int nblk;
121:
122: nblk = (ip->i_size >> bshift) - (lblkno + 1);
123: if (nblk <= 0)
124: *ap->a_runp = 0;
125: else if (nblk >= (MAXBSIZE >> bshift))
126: *ap->a_runp = (MAXBSIZE >> bshift) - 1;
127: else
128: *ap->a_runp = nblk;
129: }
130:
131: return (0);
132: }
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