The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*      $NetBSD: ccdvar.h,v 1.24 2003/10/17 05:16:15 lukem Exp $        */
    2 
    3 /*-
    4  * Copyright (c) 1996, 1997, 1998, 1999 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Jason R. Thorpe.
    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 NetBSD
   21  *        Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 /*
   40  * Copyright (c) 1990, 1993
   41  *      The Regents of the University of California.  All rights reserved.
   42  *
   43  * This code is derived from software contributed to Berkeley by
   44  * the Systems Programming Group of the University of Utah Computer
   45  * Science Department.
   46  *
   47  * Redistribution and use in source and binary forms, with or without
   48  * modification, are permitted provided that the following conditions
   49  * are met:
   50  * 1. Redistributions of source code must retain the above copyright
   51  *    notice, this list of conditions and the following disclaimer.
   52  * 2. Redistributions in binary form must reproduce the above copyright
   53  *    notice, this list of conditions and the following disclaimer in the
   54  *    documentation and/or other materials provided with the distribution.
   55  * 3. Neither the name of the University nor the names of its contributors
   56  *    may be used to endorse or promote products derived from this software
   57  *    without specific prior written permission.
   58  *
   59  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   60  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   61  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   62  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   63  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   64  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   65  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   66  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   67  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   68  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   69  * SUCH DAMAGE.
   70  *
   71  * from: Utah $Hdr: cdvar.h 1.1 90/07/09$
   72  *
   73  *      @(#)cdvar.h     8.1 (Berkeley) 6/10/93
   74  */
   75 
   76 /*
   77  * Copyright (c) 1988 University of Utah.
   78  *
   79  * This code is derived from software contributed to Berkeley by
   80  * the Systems Programming Group of the University of Utah Computer
   81  * Science Department.
   82  *
   83  * Redistribution and use in source and binary forms, with or without
   84  * modification, are permitted provided that the following conditions
   85  * are met:
   86  * 1. Redistributions of source code must retain the above copyright
   87  *    notice, this list of conditions and the following disclaimer.
   88  * 2. Redistributions in binary form must reproduce the above copyright
   89  *    notice, this list of conditions and the following disclaimer in the
   90  *    documentation and/or other materials provided with the distribution.
   91  * 3. All advertising materials mentioning features or use of this software
   92  *    must display the following acknowledgement:
   93  *      This product includes software developed by the University of
   94  *      California, Berkeley and its contributors.
   95  * 4. Neither the name of the University nor the names of its contributors
   96  *    may be used to endorse or promote products derived from this software
   97  *    without specific prior written permission.
   98  *
   99  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  100  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  101  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  102  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  103  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  104  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  105  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  106  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  107  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  108  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  109  * SUCH DAMAGE.
  110  *
  111  * from: Utah $Hdr: cdvar.h 1.1 90/07/09$
  112  *
  113  *      @(#)cdvar.h     8.1 (Berkeley) 6/10/93
  114  */
  115 
  116 #include <sys/buf.h>
  117 #include <sys/lock.h>
  118 #include <sys/queue.h>
  119 
  120 /*
  121  * Dynamic configuration and disklabel support by:
  122  *      Jason R. Thorpe <thorpej@nas.nasa.gov>
  123  *      Numerical Aerodynamic Simulation Facility
  124  *      Mail Stop 258-6
  125  *      NASA Ames Research Center
  126  *      Moffett Field, CA 94035
  127  */
  128 
  129 /*
  130  * This structure is used to configure a ccd via ioctl(2).
  131  */
  132 struct ccd_ioctl {
  133         char    **ccio_disks;           /* pointer to component paths */
  134         u_int   ccio_ndisks;            /* number of disks to concatenate */
  135         int     ccio_ileave;            /* interleave (DEV_BSIZE blocks) */
  136         int     ccio_flags;             /* see sc_flags below */
  137         int     ccio_unit;              /* unit number: use varies */
  138         size_t  ccio_size;              /* (returned) size of ccd */
  139 };
  140 
  141 /*
  142  * Component info table.
  143  * Describes a single component of a concatenated disk.
  144  */
  145 struct ccdcinfo {
  146         struct vnode    *ci_vp;                 /* device's vnode */
  147         dev_t           ci_dev;                 /* XXX: device's dev_t */
  148         size_t          ci_size;                /* size */
  149         char            *ci_path;               /* path to component */
  150         size_t          ci_pathlen;             /* length of component path */
  151 };
  152 
  153 /*
  154  * Interleave description table.
  155  * Computed at boot time to speed irregular-interleave lookups.
  156  * The idea is that we interleave in "groups".  First we interleave
  157  * evenly over all component disks up to the size of the smallest
  158  * component (the first group), then we interleave evenly over all
  159  * remaining disks up to the size of the next-smallest (second group),
  160  * and so on.
  161  *
  162  * Each table entry describes the interleave characteristics of one
  163  * of these groups.  For example if a concatenated disk consisted of
  164  * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at
  165  * DEV_BSIZE (1), the table would have three entries:
  166  *
  167  *      ndisk   startblk        startoff        dev
  168  *      3       0               0               0, 1, 2
  169  *      2       9               3               0, 2
  170  *      1       13              5               2
  171  *      0       -               -               -
  172  *
  173  * which says that the first nine blocks (0-8) are interleaved over
  174  * 3 disks (0, 1, 2) starting at block offset 0 on any component disk,
  175  * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting
  176  * at component block 3, and the remaining blocks (13-14) are on disk
  177  * 2 starting at offset 5.
  178  */
  179 struct ccdiinfo {
  180         int     ii_ndisk;       /* # of disks range is interleaved over */
  181         daddr_t ii_startblk;    /* starting scaled block # for range */
  182         daddr_t ii_startoff;    /* starting component offset (block #) */
  183         int     *ii_index;      /* ordered list of components in range */
  184 };
  185 
  186 /*
  187  * Concatenated disk pseudo-geometry information.
  188  */
  189 struct ccdgeom {
  190         u_int32_t       ccg_secsize;    /* # bytes per sector */
  191         u_int32_t       ccg_nsectors;   /* # data sectors per track */
  192         u_int32_t       ccg_ntracks;    /* # tracks per cylinder */
  193         u_int32_t       ccg_ncylinders; /* # cylinders per unit */
  194 };
  195 
  196 struct ccdbuf;
  197 
  198 /*
  199  * A concatenated disk is described after initialization by this structure.
  200  */
  201 struct ccd_softc {
  202         int              sc_flags;              /* flags */
  203         size_t           sc_size;               /* size of ccd */
  204         int              sc_ileave;             /* interleave */
  205         u_int            sc_nccdisks;           /* number of components */
  206 #define CCD_MAXNDISKS   65536
  207         struct ccdcinfo  *sc_cinfo;             /* component info */
  208         struct ccdiinfo  *sc_itable;            /* interleave table */
  209         struct ccdgeom   sc_geom;               /* pseudo geometry info */
  210         char             sc_xname[8];           /* XXX external name */
  211         struct disk      sc_dkdev;              /* generic disk device info */
  212         struct lock      sc_lock;               /* lock on this structure */
  213         struct bufq_state sc_bufq;              /* buffer queue */
  214 };
  215 
  216 /* sc_flags */
  217 #define CCDF_UNIFORM    0x002   /* use LCCD of sizes for uniform interleave */
  218 #define CCDF_NOLABEL    0x004   /* ignore on-disk (raw) disklabel */
  219 
  220 #define CCDF_INITED     0x010   /* unit has been initialized */
  221 #define CCDF_WLABEL     0x020   /* label area is writable */
  222 #define CCDF_LABELLING  0x040   /* unit is currently being labelled */
  223 #define CCDF_KLABEL     0x080   /* keep label on close */
  224 #define CCDF_VLABEL     0x100   /* label is valid */
  225 
  226 /* Mask of user-settable ccd flags. */
  227 #define CCDF_USERMASK   (CCDF_UNIFORM|CCDF_NOLABEL)
  228 
  229 /*
  230  * Before you can use a unit, it must be configured with CCDIOCSET.
  231  * The configuration persists across opens and closes of the device;
  232  * a CCDIOCCLR must be used to reset a configuration.  An attempt to
  233  * CCDIOCSET an already active unit will return EBUSY.  Attempts to
  234  * CCDIOCCLR an inactive unit will return ENXIO.
  235  */
  236 #define CCDIOCSET       _IOWR('F', 16, struct ccd_ioctl)   /* enable ccd */
  237 #define CCDIOCCLR       _IOW('F', 17, struct ccd_ioctl)    /* disable ccd */

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