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Annotation of kernel/bsd/dev/ccdvar.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            26: /*
        !            27:  * Copyright (c) 1988 University of Utah.
        !            28:  * Copyright (c) 1990, 1993
        !            29:  *     The Regents of the University of California.  All rights reserved.
        !            30:  *
        !            31:  * This code is derived from software contributed to Berkeley by
        !            32:  * the Systems Programming Group of the University of Utah Computer
        !            33:  * Science Department.
        !            34:  *
        !            35:  * Redistribution and use in source and binary forms, with or without
        !            36:  * modification, are permitted provided that the following conditions
        !            37:  * are met:
        !            38:  * 1. Redistributions of source code must retain the above copyright
        !            39:  *    notice, this list of conditions and the following disclaimer.
        !            40:  * 2. Redistributions in binary form must reproduce the above copyright
        !            41:  *    notice, this list of conditions and the following disclaimer in the
        !            42:  *    documentation and/or other materials provided with the distribution.
        !            43:  * 3. All advertising materials mentioning features or use of this software
        !            44:  *    must display the following acknowledgement:
        !            45:  *     This product includes software developed by the University of
        !            46:  *     California, Berkeley and its contributors.
        !            47:  * 4. Neither the name of the University nor the names of its contributors
        !            48:  *    may be used to endorse or promote products derived from this software
        !            49:  *    without specific prior written permission.
        !            50:  *
        !            51:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            52:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            53:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            54:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            55:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            56:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            57:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            58:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            59:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            60:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            61:  * SUCH DAMAGE.
        !            62:  *
        !            63:  * from: Utah $Hdr: cdvar.h 1.1 90/07/09$
        !            64:  *
        !            65:  *     @(#)cdvar.h     8.1 (Berkeley) 6/10/93
        !            66:  */
        !            67: 
        !            68: #define        NCCDISKS        8               /* max # of component disks */
        !            69: 
        !            70: /*
        !            71:  * A concatenated disk is described at config time by this structure.
        !            72:  */
        !            73: struct ccddevice {
        !            74:        int     ccd_unit;               /* logical unit of this ccd */
        !            75:        int     ccd_interleave;         /* interleave (DEV_BSIZE blocks) */
        !            76:        int     ccd_flags;              /* misc. information */
        !            77:        int     ccd_dk;                 /* disk number */
        !            78:        dev_t   ccd_dev[NCCDISKS];      /* component devices */
        !            79: };
        !            80: 
        !            81: /* ccd_flags */
        !            82: #define        CCDF_SWAP       0x01    /* interleave should be dmmax */
        !            83: #define CCDF_UNIFORM   0x02    /* use LCCD of sizes for uniform interleave */
        !            84: 
        !            85: /*
        !            86:  * Component info table.
        !            87:  * Describes a single component of a concatenated disk.
        !            88:  */
        !            89: struct ccdcinfo {
        !            90:        dev_t           ci_dev;  /* devno */
        !            91:        size_t          ci_size; /* size */
        !            92: };
        !            93: 
        !            94: /*
        !            95:  * Interleave description table.
        !            96:  * Computed at boot time to speed irregular-interleave lookups.
        !            97:  * The idea is that we interleave in "groups".  First we interleave
        !            98:  * evenly over all component disks up to the size of the smallest
        !            99:  * component (the first group), then we interleave evenly over all
        !           100:  * remaining disks up to the size of the next-smallest (second group),
        !           101:  * and so on.
        !           102:  *
        !           103:  * Each table entry describes the interleave characteristics of one
        !           104:  * of these groups.  For example if a concatenated disk consisted of
        !           105:  * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at
        !           106:  * DEV_BSIZE (1), the table would have three entries:
        !           107:  *
        !           108:  *     ndisk   startblk        startoff        dev
        !           109:  *     3       0               0               0, 1, 2
        !           110:  *     2       9               3               0, 2
        !           111:  *     1       13              5               2
        !           112:  *     0       -               -               -
        !           113:  *
        !           114:  * which says that the first nine blocks (0-8) are interleaved over
        !           115:  * 3 disks (0, 1, 2) starting at block offset 0 on any component disk,
        !           116:  * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting
        !           117:  * at component block 3, and the remaining blocks (13-14) are on disk
        !           118:  * 2 starting at offset 5.
        !           119:  */
        !           120: struct ccdiinfo {
        !           121:        int     ii_ndisk;       /* # of disks range is interleaved over */
        !           122:        daddr_t ii_startblk;    /* starting scaled block # for range */
        !           123:        daddr_t ii_startoff;    /* starting component offset (block #) */
        !           124:        char    ii_index[NCCDISKS];/* ordered list of components in range */
        !           125: };
        !           126: 
        !           127: #ifdef _KERNEL
        !           128: extern struct ccddevice ccddevice[];
        !           129: #endif

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