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31 * @(#)ffs_tables.c 8.1 (Berkeley) 6/11/93
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include <sys/param.h>
38 #include <sys/types.h>
39 #include <ufs/ufs/dinode.h>
40 #include <ufs/ffs/fs.h>
43 * Bit patterns for identifying fragments in the block map
44 * used as ((map & around) == inside)
47 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff, 0x1ff, 0x3ff
50 0x0, 0x2, 0x6, 0xe, 0x1e, 0x3e, 0x7e, 0xfe, 0x1fe
54 * Given a block map bit pattern, the frag tables tell whether a
55 * particular size fragment is available.
58 * if ((1 << (size - 1)) & fragtbl[fs->fs_frag][map] {
59 * at least one fragment of the indicated size is available
62 * These tables are used by the scanc instruction on the VAX to
63 * quickly find an appropriate fragment.
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,
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,
136 * The actual fragtbl array.
138 u_char *fragtbl[MAXFRAG + 1] = {
139 0, fragtbl124, fragtbl124, 0, fragtbl124, 0, 0, 0, fragtbl8,