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Annotation of 43BSDReno/sys/hpdev/cdvar.h, revision 1.1

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 is only permitted until one year after the first shipment
        !            11:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !            12:  * binary forms are permitted provided that: (1) source distributions retain
        !            13:  * this entire copyright notice and comment, and (2) distributions including
        !            14:  * binaries display the following acknowledgement:  This product includes
        !            15:  * software developed by the University of California, Berkeley and its
        !            16:  * contributors'' in the documentation or other materials provided with the
        !            17:  * distribution and in all advertising materials mentioning features or use
        !            18:  * of this software.  Neither the name of the University nor the names of
        !            19:  * its contributors may be used to endorse or promote products derived from
        !            20:  * this software without specific prior written permission.
        !            21:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            22:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            23:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            24:  *
        !            25:  * from: Utah $Hdr: cdvar.h 1.4 89/09/17$
        !            26:  *
        !            27:  *     @(#)cdvar.h     7.1 (Berkeley) 5/8/90
        !            28:  */
        !            29: 
        !            30: #define        NCDISKS 8                       /* max # of component disks */
        !            31: 
        !            32: /*
        !            33:  * A concatenated disk is described at config time by this structure.
        !            34:  */
        !            35: struct cddevice {
        !            36:        int     cd_unit;                /* logical unit of this cd */
        !            37:        int     cd_interleave;          /* interleave (DEV_BSIZE blocks) */
        !            38:        int     cd_flags;               /* misc. information */
        !            39:        int     cd_dk;                  /* disk number */
        !            40:        dev_t   cd_dev[NCDISKS];        /* component devices */
        !            41: };
        !            42: 
        !            43: /* cd_flags */
        !            44: #define        CDF_SWAP        0x01    /* interleave should be dmmax */
        !            45: #define CDF_UNIFORM    0x02    /* use LCD of sizes for uniform interleave */
        !            46: 
        !            47: /*
        !            48:  * Component info table.
        !            49:  * Describes a single component of a concatenated disk.
        !            50:  */
        !            51: struct cdcinfo {
        !            52:        dev_t           ci_dev;  /* devno */
        !            53:        size_t          ci_size; /* size */
        !            54: };
        !            55: 
        !            56: /*
        !            57:  * Interleave description table.
        !            58:  * Computed at boot time to speed irregular-interleave lookups.
        !            59:  * The idea is that we interleave in "groups".  First we interleave
        !            60:  * evenly over all component disks up to the size of the smallest
        !            61:  * component (the first group), then we interleave evenly over all
        !            62:  * remaining disks up to the size of the next-smallest (second group),
        !            63:  * and so on.
        !            64:  *
        !            65:  * Each table entry describes the interleave characteristics of one
        !            66:  * of these groups.  For example if a concatenated disk consisted of
        !            67:  * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at
        !            68:  * DEV_BSIZE (1), the table would have three entries:
        !            69:  *
        !            70:  *     ndisk   startblk        startoff        dev
        !            71:  *     3       0               0               0, 1, 2
        !            72:  *     2       9               3               0, 2
        !            73:  *     1       13              5               2
        !            74:  *     0       -               -               -
        !            75:  *
        !            76:  * which says that the first nine blocks (0-8) are interleaved over
        !            77:  * 3 disks (0, 1, 2) starting at block offset 0 on any component disk,
        !            78:  * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting
        !            79:  * at component block 3, and the remaining blocks (13-14) are on disk
        !            80:  * 2 starting at offset 5.
        !            81:  */
        !            82: struct cdiinfo {
        !            83:        int     ii_ndisk;       /* # of disks range is interleaved over */
        !            84:        daddr_t ii_startblk;    /* starting scaled block # for range */
        !            85:        daddr_t ii_startoff;    /* starting component offset (block #) */
        !            86:        char    ii_index[NCDISKS];/* ordered list of components in range */
        !            87: };
        !            88: 
        !            89: #ifdef KERNEL
        !            90: extern struct cddevice cddevice[];
        !            91: #endif

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