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

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    1 /* $FreeBSD: src/sys/sys/ccdvar.h,v 1.11.2.1 2001/09/11 09:49:54 kris Exp $ */
    2 
    3 /*      $NetBSD: ccdvar.h,v 1.7.2.1 1995/10/12 21:30:18 thorpej Exp $   */
    4 
    5 /*
    6  * Copyright (c) 1995 Jason R. Thorpe.
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. All advertising materials mentioning features or use of this software
   18  *    must display the following acknowledgement:
   19  *      This product includes software developed for the NetBSD Project
   20  *      by Jason R. Thorpe.
   21  * 4. The name of the author may not be used to endorse or promote products
   22  *    derived from this software without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   25  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   26  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   27  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   28  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   29  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   30  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   31  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   32  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  */
   36 
   37 /*
   38  * Copyright (c) 1988 University of Utah.
   39  * Copyright (c) 1990, 1993
   40  *      The Regents of the University of California.  All rights reserved.
   41  *
   42  * This code is derived from software contributed to Berkeley by
   43  * the Systems Programming Group of the University of Utah Computer
   44  * Science Department.
   45  *
   46  * Redistribution and use in source and binary forms, with or without
   47  * modification, are permitted provided that the following conditions
   48  * are met:
   49  * 1. Redistributions of source code must retain the above copyright
   50  *    notice, this list of conditions and the following disclaimer.
   51  * 2. Redistributions in binary form must reproduce the above copyright
   52  *    notice, this list of conditions and the following disclaimer in the
   53  *    documentation and/or other materials provided with the distribution.
   54  * 3. All advertising materials mentioning features or use of this software
   55  *    must display the following acknowledgement:
   56  *      This product includes software developed by the University of
   57  *      California, Berkeley and its contributors.
   58  * 4. Neither the name of the University nor the names of its contributors
   59  *    may be used to endorse or promote products derived from this software
   60  *    without specific prior written permission.
   61  *
   62  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   63  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   64  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   65  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   66  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   67  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   68  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   69  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   70  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   71  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   72  * SUCH DAMAGE.
   73  *
   74  * from: Utah $Hdr: cdvar.h 1.1 90/07/09$
   75  *
   76  *      @(#)cdvar.h     8.1 (Berkeley) 6/10/93
   77  */
   78 
   79 /*
   80  * Dynamic configuration and disklabel support by:
   81  *      Jason R. Thorpe <thorpej@nas.nasa.gov>
   82  *      Numerical Aerodynamic Simulation Facility
   83  *      Mail Stop 258-6
   84  *      NASA Ames Research Center
   85  *      Moffett Field, CA 94035
   86  */
   87 
   88 /*
   89  * A concatenated disk is described at initialization time by this structure.
   90  */
   91 struct ccddevice {
   92         int             ccd_unit;       /* logical unit of this ccd */
   93         int             ccd_interleave; /* interleave (DEV_BSIZE blocks) */
   94         int             ccd_flags;      /* misc. information */
   95         int             ccd_dk;         /* disk number */
   96         struct vnode    **ccd_vpp;      /* array of component vnodes */
   97         char            **ccd_cpp;      /* array of component pathnames */
   98         int             ccd_ndev;       /* number of component devices */
   99 };
  100 
  101 /*
  102  * This structure is used to configure a ccd via ioctl(2).
  103  */
  104 struct ccd_ioctl {
  105         char    **ccio_disks;           /* pointer to component paths */
  106         u_int   ccio_ndisks;            /* number of disks to concatenate */
  107         int     ccio_ileave;            /* interleave (DEV_BSIZE blocks) */
  108         int     ccio_flags;             /* misc. information */
  109         int     ccio_unit;              /* unit number: use varies */
  110         size_t  ccio_size;              /* (returned) size of ccd */
  111 };
  112 
  113 /* ccd_flags */
  114 #define CCDF_SWAP       0x01    /* interleave should be dmmax */
  115 #define CCDF_UNIFORM    0x02    /* use LCCD of sizes for uniform interleave */
  116 #define CCDF_MIRROR     0x04    /* use mirroring */
  117 #define CCDF_PARITY     0x08    /* use parity (RAID level 5) */
  118 
  119 /* Mask of user-settable ccd flags. */
  120 #define CCDF_USERMASK   (CCDF_SWAP|CCDF_UNIFORM|CCDF_MIRROR|CCDF_PARITY)
  121 
  122 /*
  123  * Component info table.
  124  * Describes a single component of a concatenated disk.
  125  */
  126 struct ccdcinfo {
  127         struct vnode    *ci_vp;                 /* device's vnode */
  128         dev_t           ci_dev;                 /* XXX: device's dev_t */
  129         size_t          ci_size;                /* size */
  130         char            *ci_path;               /* path to component */
  131         size_t          ci_pathlen;             /* length of component path */
  132 };
  133 
  134 /*
  135  * Interleave description table.
  136  * Computed at boot time to speed irregular-interleave lookups.
  137  * The idea is that we interleave in "groups".  First we interleave
  138  * evenly over all component disks up to the size of the smallest
  139  * component (the first group), then we interleave evenly over all
  140  * remaining disks up to the size of the next-smallest (second group),
  141  * and so on.
  142  *
  143  * Each table entry describes the interleave characteristics of one
  144  * of these groups.  For example if a concatenated disk consisted of
  145  * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at
  146  * DEV_BSIZE (1), the table would have three entries:
  147  *
  148  *      ndisk   startblk        startoff        dev
  149  *      3       0               0               0, 1, 2
  150  *      2       9               3               0, 2
  151  *      1       13              5               2
  152  *      0       -               -               -
  153  *
  154  * which says that the first nine blocks (0-8) are interleaved over
  155  * 3 disks (0, 1, 2) starting at block offset 0 on any component disk,
  156  * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting
  157  * at component block 3, and the remaining blocks (13-14) are on disk
  158  * 2 starting at offset 5.
  159  */
  160 struct ccdiinfo {
  161         int     ii_ndisk;       /* # of disks range is interleaved over */
  162         daddr_t ii_startblk;    /* starting scaled block # for range */
  163         daddr_t ii_startoff;    /* starting component offset (block #) */
  164         int     *ii_index;      /* ordered list of components in range */
  165 };
  166 
  167 /*
  168  * Concatenated disk pseudo-geometry information.
  169  */
  170 struct ccdgeom {
  171         u_int32_t       ccg_secsize;    /* # bytes per sector */
  172         u_int32_t       ccg_nsectors;   /* # data sectors per track */
  173         u_int32_t       ccg_ntracks;    /* # tracks per cylinder */
  174         u_int32_t       ccg_ncylinders; /* # cylinders per unit */
  175 };
  176 
  177 /*
  178  * A concatenated disk is described after initialization by this structure.
  179  */
  180 struct ccd_softc {
  181         int              sc_unit;               /* logical unit number */
  182         int              sc_flags;              /* flags */
  183         int              sc_cflags;             /* configuration flags */
  184         size_t           sc_size;               /* size of ccd */
  185         int              sc_ileave;             /* interleave */
  186         u_int            sc_nccdisks;           /* number of components */
  187 #define CCD_MAXNDISKS    65536
  188         struct ccdcinfo  *sc_cinfo;             /* component info */
  189         struct ccdiinfo  *sc_itable;            /* interleave table */
  190         struct devstat   device_stats;          /* device statistics */
  191         struct ccdgeom   sc_geom;               /* pseudo geometry info */
  192         struct disklabel sc_label;              /* generic disk device info */
  193         int              sc_openmask;
  194         int              sc_pick;               /* side of mirror picked */
  195         daddr_t          sc_blk[2];             /* mirror localization */
  196 };
  197 
  198 /* sc_flags */
  199 #define CCDF_INITED     0x01    /* unit has been initialized */
  200 #define CCDF_WLABEL     0x02    /* label area is writable */
  201 #define CCDF_LABELLING  0x04    /* unit is currently being labelled */
  202 #define CCDF_WANTED     0x40    /* someone is waiting to obtain a lock */
  203 #define CCDF_LOCKED     0x80    /* unit is locked */
  204 
  205 /*
  206  * Before you can use a unit, it must be configured with CCDIOCSET.
  207  * The configuration persists across opens and closes of the device;
  208  * a CCDIOCCLR must be used to reset a configuration.  An attempt to
  209  * CCDIOCSET an already active unit will return EBUSY.  Attempts to
  210  * CCDIOCCLR an inactive unit will return ENXIO.
  211  */
  212 #define CCDIOCSET       _IOWR('F', 16, struct ccd_ioctl)   /* enable ccd */
  213 #define CCDIOCCLR       _IOW('F', 17, struct ccd_ioctl)    /* disable ccd */

Cache object: e8601dc84bd99b6210a6096be672762f


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