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1.1 root 1: /*
2: * Copyright (c) 1988 University of Utah.
3: * Copyright (c) 1990 The Regents of the University of California.
4: * All rights reserved.
5: *
6: * This code is derived from software contributed to Berkeley by
7: * the Systems Programming Group of the University of Utah Computer
8: * Science Department.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the University of
21: * California, Berkeley and its contributors.
22: * 4. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: *
38: * from: Utah $Hdr: cdvar.h 1.1 90/07/09$
39: *
40: * @(#)cdvar.h 7.2 (Berkeley) 11/4/90
41: */
42:
43: #define NCDISKS 8 /* max # of component disks */
44:
45: /*
46: * A concatenated disk is described at config time by this structure.
47: */
48: struct cddevice {
49: int cd_unit; /* logical unit of this cd */
50: int cd_interleave; /* interleave (DEV_BSIZE blocks) */
51: int cd_flags; /* misc. information */
52: int cd_dk; /* disk number */
53: dev_t cd_dev[NCDISKS]; /* component devices */
54: };
55:
56: /* cd_flags */
57: #define CDF_SWAP 0x01 /* interleave should be dmmax */
58: #define CDF_UNIFORM 0x02 /* use LCD of sizes for uniform interleave */
59:
60: /*
61: * Component info table.
62: * Describes a single component of a concatenated disk.
63: */
64: struct cdcinfo {
65: dev_t ci_dev; /* devno */
66: size_t ci_size; /* size */
67: };
68:
69: /*
70: * Interleave description table.
71: * Computed at boot time to speed irregular-interleave lookups.
72: * The idea is that we interleave in "groups". First we interleave
73: * evenly over all component disks up to the size of the smallest
74: * component (the first group), then we interleave evenly over all
75: * remaining disks up to the size of the next-smallest (second group),
76: * and so on.
77: *
78: * Each table entry describes the interleave characteristics of one
79: * of these groups. For example if a concatenated disk consisted of
80: * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at
81: * DEV_BSIZE (1), the table would have three entries:
82: *
83: * ndisk startblk startoff dev
84: * 3 0 0 0, 1, 2
85: * 2 9 3 0, 2
86: * 1 13 5 2
87: * 0 - - -
88: *
89: * which says that the first nine blocks (0-8) are interleaved over
90: * 3 disks (0, 1, 2) starting at block offset 0 on any component disk,
91: * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting
92: * at component block 3, and the remaining blocks (13-14) are on disk
93: * 2 starting at offset 5.
94: */
95: struct cdiinfo {
96: int ii_ndisk; /* # of disks range is interleaved over */
97: daddr_t ii_startblk; /* starting scaled block # for range */
98: daddr_t ii_startoff; /* starting component offset (block #) */
99: char ii_index[NCDISKS];/* ordered list of components in range */
100: };
101:
102: #ifdef KERNEL
103: extern struct cddevice cddevice[];
104: #endif
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