FreeBSD/Linux Kernel Cross Reference
sys/sys/ccdvar.h

     /* $FreeBSD: releng/5.0/sys/sys/ccdvar.h 83291 2001-09-10 11:28:07Z kris $ */
     
     /*      $NetBSD: ccdvar.h,v 1.7.2.1 1995/10/12 21:30:18 thorpej Exp $   */
     
     /*
      * Copyright (c) 1995 Jason R. Thorpe.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed for the NetBSD Project
     *      by Jason R. Thorpe.
     * 4. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    /*
     * Copyright (c) 1988 University of Utah.
     * Copyright (c) 1990, 1993
     *      The Regents of the University of California.  All rights reserved.
     *
     * This code is derived from software contributed to Berkeley by
     * the Systems Programming Group of the University of Utah Computer
     * Science Department.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * from: Utah $Hdr: cdvar.h 1.1 90/07/09$
     *
     *      @(#)cdvar.h     8.1 (Berkeley) 6/10/93
     */
    
    /*
     * Dynamic configuration and disklabel support by:
     *      Jason R. Thorpe <thorpej@nas.nasa.gov>
     *      Numerical Aerodynamic Simulation Facility
     *      Mail Stop 258-6
     *      NASA Ames Research Center
     *      Moffett Field, CA 94035
     */
    
    /*
     * This structure is used to configure a ccd via ioctl(2).
     */
    struct ccd_ioctl {
            char    **ccio_disks;           /* pointer to component paths */
            u_int   ccio_ndisks;            /* number of disks to concatenate */
            int     ccio_ileave;            /* interleave (DEV_BSIZE blocks) */
            int     ccio_flags;             /* misc. information */
            int     ccio_unit;              /* unit number: use varies */
            size_t  ccio_size;              /* (returned) size of ccd */
    };
    
   /* Mask of user-settable ccd flags. */
   #define CCDF_USERMASK   (CCDF_SWAP|CCDF_UNIFORM|CCDF_MIRROR|CCDF_PARITY)
   
   /*
    * Component info table.
    * Describes a single component of a concatenated disk.
    */
   struct ccdcinfo {
           struct vnode    *ci_vp;                 /* device's vnode */
           dev_t           ci_dev;                 /* XXX: device's dev_t */
           size_t          ci_size;                /* size */
           char            *ci_path;               /* path to component */
           size_t          ci_pathlen;             /* length of component path */
   };
   
   /*
    * Interleave description table.
    * Computed at boot time to speed irregular-interleave lookups.
    * The idea is that we interleave in "groups".  First we interleave
    * evenly over all component disks up to the size of the smallest
    * component (the first group), then we interleave evenly over all
    * remaining disks up to the size of the next-smallest (second group),
    * and so on.
    *
    * Each table entry describes the interleave characteristics of one
    * of these groups.  For example if a concatenated disk consisted of
    * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at
    * DEV_BSIZE (1), the table would have three entries:
    *
    *      ndisk   startblk        startoff        dev
    *      3       0               0               0, 1, 2
    *      2       9               3               0, 2
    *      1       13              5               2
    *      0       -               -               -
    *
    * which says that the first nine blocks (0-8) are interleaved over
    * 3 disks (0, 1, 2) starting at block offset 0 on any component disk,
    * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting
    * at component block 3, and the remaining blocks (13-14) are on disk
    * 2 starting at offset 5.
    */
   struct ccdiinfo {
           int     ii_ndisk;       /* # of disks range is interleaved over */
           daddr_t ii_startblk;    /* starting scaled block # for range */
           daddr_t ii_startoff;    /* starting component offset (block #) */
           int     *ii_index;      /* ordered list of components in range */
   };
   
   /*
    * Concatenated disk pseudo-geometry information.
    */
   struct ccdgeom {
           u_int32_t       ccg_secsize;    /* # bytes per sector */
           u_int32_t       ccg_nsectors;   /* # data sectors per track */
           u_int32_t       ccg_ntracks;    /* # tracks per cylinder */
           u_int32_t       ccg_ncylinders; /* # cylinders per unit */
   };
   
   /*
    * A concatenated disk is described by this structure.
    */
   struct ccd_s {
           LIST_ENTRY(ccd_s) list;
   
           int              sc_unit;               /* logical unit number */
           struct vnode     **sc_vpp;              /* array of component vnodes */
           int              sc_flags;              /* flags */
           int              sc_cflags;             /* configuration flags */
           size_t           sc_size;               /* size of ccd */
           int              sc_ileave;             /* interleave */
           u_int            sc_nccdisks;           /* number of components */
   #define CCD_MAXNDISKS    65536
           struct ccdcinfo  *sc_cinfo;             /* component info */
           struct ccdiinfo  *sc_itable;            /* interleave table */
           struct devstat   device_stats;          /* device statistics */
           struct ccdgeom   sc_geom;               /* pseudo geometry info */
           struct disklabel sc_label;              /* generic disk device info */
           int              sc_openmask;
           int              sc_pick;               /* side of mirror picked */
           daddr_t          sc_blk[2];             /* mirror localization */
   };
   
   /* sc_flags */
   #define CCDF_SWAP       0x01    /* interleave should be dmmax */
   #define CCDF_UNIFORM    0x02    /* use LCCD of sizes for uniform interleave */
   #define CCDF_MIRROR     0x04    /* use mirroring */
   #define CCDF_PARITY     0x08    /* use parity (RAID level 5) */
   #define CCDF_INITED     0x10    /* unit has been initialized */
   #define CCDF_WLABEL     0x20    /* label area is writable */
   #define CCDF_LABELLING  0x40    /* unit is currently being labelled */
   #define CCDF_WANTED     0x60    /* someone is waiting to obtain a lock */
   #define CCDF_LOCKED     0x80    /* unit is locked */
   
   /*
    * Before you can use a unit, it must be configured with CCDIOCSET.
    * The configuration persists across opens and closes of the device;
    * a CCDIOCCLR must be used to reset a configuration.  An attempt to
    * CCDIOCSET an already active unit will return EBUSY.  Attempts to
    * CCDIOCCLR an inactive unit will return ENXIO.
    */
   #define CCDIOCSET       _IOWR('F', 16, struct ccd_ioctl)   /* enable ccd */
   #define CCDIOCCLR       _IOW('F', 17, struct ccd_ioctl)    /* disable ccd */
   
   struct ccdconf {
           int              size;          /* sizeof of buffer below */
           struct ccd_s     *buffer;       /* pointer to a configuration array */
   };
   #define CCDCONFINFO     _IOWR('F', 19, struct ccdconf)     /* get config */
   
   struct ccdcpps {
           int             size;
           char            *buffer;
   };
   #define CCDCPPINFO      _IOWR('F', 20, struct ccdcpps)     /* get components */

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