The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/ufs/ffs/ffs_tables.c

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    1 /*      $NetBSD: ffs_tables.c,v 1.7 2003/10/27 00:12:42 lukem Exp $     */
    2 
    3 /*
    4  * Copyright (c) 1982, 1986, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)ffs_tables.c        8.1 (Berkeley) 6/11/93
   32  */
   33 
   34 #if HAVE_NBTOOL_CONFIG_H
   35 #include "nbtool_config.h"
   36 #endif
   37 
   38 #include <sys/cdefs.h>
   39 __KERNEL_RCSID(0, "$NetBSD: ffs_tables.c,v 1.7 2003/10/27 00:12:42 lukem Exp $");
   40 
   41 #include <sys/param.h>
   42 
   43 /*
   44  * Bit patterns for identifying fragments in the block map
   45  * used as ((map & around) == inside)
   46  */
   47 const int around[9] = {
   48         0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff
   49 };
   50 const int inside[9] = {
   51         0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe
   52 };
   53 
   54 /*
   55  * Given a block map bit pattern, the frag tables tell whether a
   56  * particular size fragment is available. 
   57  *
   58  * used as:
   59  * if ((1 << (size - 1)) & fragtbl[fs->fs_frag][map] {
   60  *      at least one fragment of the indicated size is available
   61  * }
   62  *
   63  * These tables are used by the scanc instruction on the VAX to
   64  * quickly find an appropriate fragment.
   65  */
   66 const u_char fragtbl124[256] = {
   67         0x00, 0x16, 0x16, 0x2a, 0x16, 0x16, 0x26, 0x4e,
   68         0x16, 0x16, 0x16, 0x3e, 0x2a, 0x3e, 0x4e, 0x8a,
   69         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   70         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   71         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   72         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   73         0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
   74         0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
   75         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   76         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   77         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   78         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   79         0x26, 0x36, 0x36, 0x2e, 0x36, 0x36, 0x26, 0x6e,
   80         0x36, 0x36, 0x36, 0x3e, 0x2e, 0x3e, 0x6e, 0xae,
   81         0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
   82         0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
   83         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   84         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   85         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   86         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   87         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   88         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   89         0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
   90         0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
   91         0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
   92         0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
   93         0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
   94         0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
   95         0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
   96         0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
   97         0x8a, 0x9e, 0x9e, 0xaa, 0x9e, 0x9e, 0xae, 0xce,
   98         0x9e, 0x9e, 0x9e, 0xbe, 0xaa, 0xbe, 0xce, 0x8a,
   99 };
  100 
  101 const u_char fragtbl8[256] = {
  102         0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04,
  103         0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08,
  104         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  105         0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10,
  106         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  107         0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
  108         0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
  109         0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20,
  110         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  111         0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
  112         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  113         0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
  114         0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
  115         0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
  116         0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
  117         0x08, 0x09, 0x09, 0x0a, 0x10, 0x11, 0x20, 0x40,
  118         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  119         0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
  120         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  121         0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
  122         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  123         0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
  124         0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
  125         0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21,
  126         0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
  127         0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
  128         0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
  129         0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0a, 0x12,
  130         0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
  131         0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0c,
  132         0x08, 0x09, 0x09, 0x0a, 0x09, 0x09, 0x0a, 0x0c,
  133         0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80,
  134 };
  135 
  136 /*
  137  * The actual fragtbl array.
  138  */
  139 const u_char * const fragtbl[MAXFRAG + 1] = {
  140         0, fragtbl124, fragtbl124, 0, fragtbl124, 0, 0, 0, fragtbl8,
  141 };

Cache object: 08819af3cb038f53ca6de1d367f12bfc

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