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

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

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

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10  
    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    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 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD$");
   36 
   37 #include <sys/param.h>
   38 #include <sys/types.h>
   39 #include <ufs/ufs/dinode.h>
   40 #include <ufs/ffs/fs.h>
   41 
   42 /*
   43  * Bit patterns for identifying fragments in the block map
   44  * used as ((map & around) == inside)
   45  */
   46 int around[9] = {
   47         0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff
   48 };
   49 int inside[9] = {
   50         0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe
   51 };
   52 
   53 /*
   54  * Given a block map bit pattern, the frag tables tell whether a
   55  * particular size fragment is available.
   56  *
   57  * used as:
   58  * if ((1 << (size - 1)) & fragtbl[fs->fs_frag][map] {
   59  *      at least one fragment of the indicated size is available
   60  * }
   61  *
   62  * These tables are used by the scanc instruction on the VAX to
   63  * quickly find an appropriate fragment.
   64  */
   65 static u_char fragtbl124[256] = {
   66         0x00, 0x16, 0x16, 0x2a, 0x16, 0x16, 0x26, 0x4e,
   67         0x16, 0x16, 0x16, 0x3e, 0x2a, 0x3e, 0x4e, 0x8a,
   68         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   69         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   70         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   71         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   72         0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
   73         0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
   74         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   75         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   76         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   77         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   78         0x26, 0x36, 0x36, 0x2e, 0x36, 0x36, 0x26, 0x6e,
   79         0x36, 0x36, 0x36, 0x3e, 0x2e, 0x3e, 0x6e, 0xae,
   80         0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
   81         0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
   82         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   83         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   84         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   85         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   86         0x16, 0x16, 0x16, 0x3e, 0x16, 0x16, 0x36, 0x5e,
   87         0x16, 0x16, 0x16, 0x3e, 0x3e, 0x3e, 0x5e, 0x9e,
   88         0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
   89         0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
   90         0x2a, 0x3e, 0x3e, 0x2a, 0x3e, 0x3e, 0x2e, 0x6e,
   91         0x3e, 0x3e, 0x3e, 0x3e, 0x2a, 0x3e, 0x6e, 0xaa,
   92         0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e,
   93         0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x3e, 0x7e, 0xbe,
   94         0x4e, 0x5e, 0x5e, 0x6e, 0x5e, 0x5e, 0x6e, 0x4e,
   95         0x5e, 0x5e, 0x5e, 0x7e, 0x6e, 0x7e, 0x4e, 0xce,
   96         0x8a, 0x9e, 0x9e, 0xaa, 0x9e, 0x9e, 0xae, 0xce,
   97         0x9e, 0x9e, 0x9e, 0xbe, 0xaa, 0xbe, 0xce, 0x8a,
   98 };
   99 
  100 static u_char fragtbl8[256] = {
  101         0x00, 0x01, 0x01, 0x02, 0x01, 0x01, 0x02, 0x04,
  102         0x01, 0x01, 0x01, 0x03, 0x02, 0x03, 0x04, 0x08,
  103         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  104         0x02, 0x03, 0x03, 0x02, 0x04, 0x05, 0x08, 0x10,
  105         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  106         0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
  107         0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
  108         0x04, 0x05, 0x05, 0x06, 0x08, 0x09, 0x10, 0x20,
  109         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  110         0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
  111         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  112         0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
  113         0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
  114         0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
  115         0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
  116         0x08, 0x09, 0x09, 0x0a, 0x10, 0x11, 0x20, 0x40,
  117         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  118         0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
  119         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  120         0x03, 0x03, 0x03, 0x03, 0x05, 0x05, 0x09, 0x11,
  121         0x01, 0x01, 0x01, 0x03, 0x01, 0x01, 0x03, 0x05,
  122         0x01, 0x01, 0x01, 0x03, 0x03, 0x03, 0x05, 0x09,
  123         0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
  124         0x05, 0x05, 0x05, 0x07, 0x09, 0x09, 0x11, 0x21,
  125         0x02, 0x03, 0x03, 0x02, 0x03, 0x03, 0x02, 0x06,
  126         0x03, 0x03, 0x03, 0x03, 0x02, 0x03, 0x06, 0x0a,
  127         0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x07,
  128         0x02, 0x03, 0x03, 0x02, 0x06, 0x07, 0x0a, 0x12,
  129         0x04, 0x05, 0x05, 0x06, 0x05, 0x05, 0x06, 0x04,
  130         0x05, 0x05, 0x05, 0x07, 0x06, 0x07, 0x04, 0x0c,
  131         0x08, 0x09, 0x09, 0x0a, 0x09, 0x09, 0x0a, 0x0c,
  132         0x10, 0x11, 0x11, 0x12, 0x20, 0x21, 0x40, 0x80,
  133 };
  134 
  135 /*
  136  * The actual fragtbl array.
  137  */
  138 u_char *fragtbl[MAXFRAG + 1] = {
  139         0, fragtbl124, fragtbl124, 0, fragtbl124, 0, 0, 0, fragtbl8,
  140 };

Cache object: 1a6e2ee16238ed973b17ea4df56866e1

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.