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