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 /*-
    2  * Copyright (c) 1982, 1986, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)ffs_tables.c        8.1 (Berkeley) 6/11/93
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/10.1/sys/ufs/ffs/ffs_tables.c 139825 2005-01-07 02:29:27Z imp $");
   34 
   35 #include <sys/param.h>
   36 #include <ufs/ufs/dinode.h>
   37 #include <ufs/ffs/fs.h>
   38 
   39 /*
   40  * Bit patterns for identifying fragments in the block map
   41  * used as ((map & around) == inside)
   42  */
   43 int around[9] = {
   44         0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff
   45 };
   46 int inside[9] = {
   47         0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe
   48 };
   49 
   50 /*
   51  * Given a block map bit pattern, the frag tables tell whether a
   52  * particular size fragment is available.
   53  *
   54  * used as:
   55  * if ((1 << (size - 1)) & fragtbl[fs->fs_frag][map] {
   56  *      at least one fragment of the indicated size is available
   57  * }
   58  *
   59  * These tables are used by the scanc instruction on the VAX to
   60  * quickly find an appropriate fragment.
   61  */
   62 static u_char fragtbl124[256] = {
   63         0x00, 0x16, 0x16, 0x2a, 0x16, 0x16, 0x26, 0x4e,
   64         0x16, 0x16, 0x16, 0x3e, 0x2a, 0x3e, 0x4e, 0x8a,
   65         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   66         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   67         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   68         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   69         0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
   70         0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
   71         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   72         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   73         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   74         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   75         0x26, 0x36, 0x36, 0x2e, 0x36, 0x36, 0x26, 0x6e,
   76         0x36, 0x36, 0x36, 0x3e, 0x2e, 0x3e, 0x6e, 0xae,
   77         0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
   78         0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
   79         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   80         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   81         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   82         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   83         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   84         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   85         0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
   86         0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
   87         0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
   88         0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
   89         0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
   90         0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
   91         0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
   92         0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
   93         0x8a, 0x9e, 0x9e, 0xaa, 0x9e, 0x9e, 0xae, 0xce,
   94         0x9e, 0x9e, 0x9e, 0xbe, 0xaa, 0xbe, 0xce, 0x8a,
   95 };
   96 
   97 static u_char fragtbl8[256] = {
   98         0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04,
   99         0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08,
  100         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  101         0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10,
  102         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  103         0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
  104         0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
  105         0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20,
  106         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  107         0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
  108         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  109         0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
  110         0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
  111         0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
  112         0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
  113         0x08, 0x09, 0x09, 0x0a, 0x10, 0x11, 0x20, 0x40,
  114         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  115         0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
  116         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  117         0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
  118         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  119         0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
  120         0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
  121         0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21,
  122         0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
  123         0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
  124         0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
  125         0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0a, 0x12,
  126         0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
  127         0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0c,
  128         0x08, 0x09, 0x09, 0x0a, 0x09, 0x09, 0x0a, 0x0c,
  129         0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80,
  130 };
  131 
  132 /*
  133  * The actual fragtbl array.
  134  */
  135 u_char *fragtbl[MAXFRAG + 1] = {
  136         0, fragtbl124, fragtbl124, 0, fragtbl124, 0, 0, 0, fragtbl8,
  137 };

Cache object: 3bb3dc630927fabf588bc620ac1d99c3

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