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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /* $NetBSD: cd9660_bmap.c,v 1.5 1994/12/13 22:33:12 mycroft Exp $ */
23:
24: /*-
25: * Copyright (c) 1994
26: * The Regents of the University of California. All rights reserved.
27: *
28: * This code is derived from software contributed to Berkeley
29: * by Pace Willisson ([email protected]). The Rock Ridge Extension
30: * Support code is derived from software contributed to Berkeley
31: * by Atsushi Murai ([email protected]).
32: *
33: * Redistribution and use in source and binary forms, with or without
34: * modification, are permitted provided that the following conditions
35: * are met:
36: * 1. Redistributions of source code must retain the above copyright
37: * notice, this list of conditions and the following disclaimer.
38: * 2. Redistributions in binary form must reproduce the above copyright
39: * notice, this list of conditions and the following disclaimer in the
40: * documentation and/or other materials provided with the distribution.
41: * 3. All advertising materials mentioning features or use of this software
42: * must display the following acknowledgement:
43: * This product includes software developed by the University of
44: * California, Berkeley and its contributors.
45: * 4. Neither the name of the University nor the names of its contributors
46: * may be used to endorse or promote products derived from this software
47: * without specific prior written permission.
48: *
49: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59: * SUCH DAMAGE.
60: *
61: * @(#)cd9660_bmap.c 8.4 (Berkeley) 12/5/94
62:
63:
64:
65: * HISTORY
66: * 22-Jan-98 radar 1669467 - ISO 9660 CD support - jwc
67:
68: */
69:
70: #include <sys/param.h>
71: #include <sys/namei.h>
72: #include <sys/buf.h>
73: #include <sys/file.h>
74: #include <sys/vnode.h>
75: #include <sys/mount.h>
76:
77: #include <isofs/cd9660/iso.h>
78: #include <isofs/cd9660/cd9660_node.h>
79:
80: /*
81: * Bmap converts a the logical block number of a file to its physical block
82: * number on the disk. The conversion is done by using the logical block
83: * number to index into the data block (extent) for the file.
84: */
85: int
86: cd9660_bmap(ap)
87: struct vop_bmap_args /* {
88: struct vnode *a_vp;
89: daddr_t a_bn;
90: struct vnode **a_vpp;
91: daddr_t *a_bnp;
92: int *a_runp;
93: } */ *ap;
94: {
95: struct iso_node *ip = VTOI(ap->a_vp);
96: daddr_t lblkno = ap->a_bn;
97: int bshift;
98:
99: /*
100: * Check for underlying vnode requests and ensure that logical
101: * to physical mapping is requested.
102: */
103: if (ap->a_vpp != NULL)
104: *ap->a_vpp = ip->i_devvp;
105: if (ap->a_bnp == NULL)
106: return (0);
107:
108: /*
109: * Compute the requested block number
110: */
111: bshift = ip->i_mnt->im_bshift;
112: #if 1 // radar 1669467 - logical and physical blocksize is the same
113: *ap->a_bnp = (ip->iso_start + lblkno);
114: #else
115: *ap->a_bnp = (ip->iso_start + lblkno) << (bshift - DEV_BSHIFT);
116: #endif // radar 1669467
117:
118: /*
119: * Determine maximum number of readahead blocks following the
120: * requested block.
121: */
122: if (ap->a_runp) {
123: int nblk;
124:
125: nblk = (ip->i_size >> bshift) - (lblkno + 1);
126: if (nblk <= 0)
127: *ap->a_runp = 0;
128: else if (nblk >= (MAXBSIZE >> bshift))
129: *ap->a_runp = (MAXBSIZE >> bshift) - 1;
130: else
131: *ap->a_runp = nblk;
132: }
133:
134: return (0);
135: }
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