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/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 /* $DragonFly: src/sys/sys/ccdvar.h,v 1.7 2007/07/12 00:25:57 dillon Exp $ */
    3 
    4 /*      $NetBSD: ccdvar.h,v 1.7.2.1 1995/10/12 21:30:18 thorpej Exp $   */
    5 
    6 /*
    7  * Copyright (c) 1995 Jason R. Thorpe.
    8  * All rights reserved.
    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 for the NetBSD Project
   21  *      by Jason R. Thorpe.
   22  * 4. The name of the author may not be used to endorse or promote products
   23  *    derived from this software without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   26  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   28  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   29  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   30  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   31  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
   32  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   33  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  */
   37 
   38 /*
   39  * Copyright (c) 1988 University of Utah.
   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. All advertising materials mentioning features or use of this software
   56  *    must display the following acknowledgement:
   57  *      This product includes software developed by the University of
   58  *      California, Berkeley and its contributors.
   59  * 4. Neither the name of the University nor the names of its contributors
   60  *    may be used to endorse or promote products derived from this software
   61  *    without specific prior written permission.
   62  *
   63  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   64  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   65  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   66  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   67  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   68  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   69  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   70  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   71  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   72  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   73  * SUCH DAMAGE.
   74  *
   75  * from: Utah $Hdr: cdvar.h 1.1 90/07/09$
   76  *
   77  *      @(#)cdvar.h     8.1 (Berkeley) 6/10/93
   78  */
   79 
   80 #ifndef _SYS_CCDVAR_H_
   81 #define _SYS_CCDVAR_H_
   82 
   83 /*
   84  * Original dynamic configuration support by:
   85  *      Jason R. Thorpe <thorpej@nas.nasa.gov>
   86  *      Numerical Aerodynamic Simulation Facility
   87  *      Mail Stop 258-6
   88  *      NASA Ames Research Center
   89  *      Moffett Field, CA 94035
   90  */
   91 
   92 #ifndef _SYS_TYPES_H_
   93 #include <sys/types.h>
   94 #endif
   95 #ifndef _SYS_CONF_H_
   96 #include <sys/conf.h>
   97 #endif
   98 #ifndef _SYS_DEVICESTAT_H_
   99 #include <sys/devicestat.h>
  100 #endif
  101 #ifndef _SYS_DISK_H_
  102 #include <sys/disk.h>
  103 #endif
  104 #ifndef _SYS_DISKSLICE_H_
  105 #include <sys/diskslice.h>
  106 #endif
  107 #ifndef _SYS_IOCCOM_H_
  108 #include <sys/ioccom.h>
  109 #endif
  110 
  111 /*
  112  * A concatenated disk is described at initialization time by this structure.
  113  */
  114 struct ccddevice {
  115         int             ccd_unit;       /* logical unit of this ccd */
  116         int             ccd_interleave; /* interleave (DEV_BSIZE blocks) */
  117         int             ccd_flags;      /* misc. information */
  118         int             ccd_unused01;   /* disk number */
  119         struct vnode    **ccd_vpp;      /* array of component vnodes */
  120         char            **ccd_cpp;      /* array of component pathnames */
  121         int             ccd_ndev;       /* number of component devices */
  122 };
  123 
  124 /*
  125  * This structure is used to configure a ccd via ioctl(2).
  126  */
  127 struct ccd_ioctl {
  128         char    **ccio_disks;           /* pointer to component paths */
  129         u_int   ccio_ndisks;            /* number of disks to concatenate */
  130         int     ccio_ileave;            /* interleave (DEV_BSIZE blocks) */
  131         int     ccio_flags;             /* misc. information */
  132         int     ccio_unit;              /* unit number: use varies */
  133         u_int64_t ccio_size;            /* (returned) size of ccd in sectors */
  134 };
  135 
  136 /* ccd_flags */
  137 #define CCDF_SWAP       0x01    /* interleave should be dmmax */
  138 #define CCDF_UNIFORM    0x02    /* use LCCD of sizes for uniform interleave */
  139 #define CCDF_MIRROR     0x04    /* use mirroring */
  140 #define CCDF_PARITY     0x08    /* use parity (RAID level 5) */
  141 
  142 /* Mask of user-settable ccd flags. */
  143 #define CCDF_USERMASK   (CCDF_SWAP|CCDF_UNIFORM|CCDF_MIRROR|CCDF_PARITY)
  144 
  145 /*
  146  * Component info table.
  147  * Describes a single component of a concatenated disk.
  148  */
  149 struct cdev;
  150 
  151 struct ccdcinfo {
  152         struct vnode    *ci_vp;                 /* device's vnode */
  153         struct cdev     *ci_dev;                /* XXX: device's dev_t */
  154         u_int64_t       ci_size;                /* size in sectors */
  155         u_int64_t       ci_skip;                /* start skip in sectors */
  156         char            *ci_path;               /* path to component */
  157         size_t          ci_pathlen;             /* length of component path */
  158 };
  159 
  160 /*
  161  * Interleave description table.
  162  * Computed at boot time to speed irregular-interleave lookups.
  163  * The idea is that we interleave in "groups".  First we interleave
  164  * evenly over all component disks up to the size of the smallest
  165  * component (the first group), then we interleave evenly over all
  166  * remaining disks up to the size of the next-smallest (second group),
  167  * and so on.
  168  *
  169  * Each table entry describes the interleave characteristics of one
  170  * of these groups.  For example if a concatenated disk consisted of
  171  * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at
  172  * DEV_BSIZE (1), the table would have three entries:
  173  *
  174  *      ndisk   startblk        startoff        dev
  175  *      3       0               0               0, 1, 2
  176  *      2       9               3               0, 2
  177  *      1       13              5               2
  178  *      0       -               -               -
  179  *
  180  * which says that the first nine blocks (0-8) are interleaved over
  181  * 3 disks (0, 1, 2) starting at block offset 0 on any component disk,
  182  * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting
  183  * at component block 3, and the remaining blocks (13-14) are on disk
  184  * 2 starting at offset 5.
  185  */
  186 struct ccdiinfo {
  187         int     ii_ndisk;       /* # of disks range is interleaved over */
  188         u_int64_t ii_startblk;  /* starting scaled block # for range */
  189         u_int64_t ii_startoff;  /* starting component offset (block #) */
  190         int     *ii_index;      /* ordered list of components in range */
  191 };
  192 
  193 /*
  194  * Concatenated disk pseudo-geometry information.
  195  */
  196 struct ccdgeom {
  197         u_int32_t       ccg_secsize;    /* # bytes per sector */
  198         u_int32_t       ccg_nsectors;   /* # data sectors per track */
  199         u_int32_t       ccg_ntracks;    /* # tracks per cylinder */
  200         u_int32_t       ccg_ncylinders; /* # cylinders per unit */
  201 };
  202 
  203 /*
  204  * A concatenated disk is described after initialization by this structure.
  205  */
  206 struct ccd_softc {
  207         int              sc_unit;               /* logical unit number */
  208         int              sc_flags;              /* flags */
  209         int              sc_cflags;             /* configuration flags */
  210         u_int64_t        sc_size;               /* size of ccd in sectors */
  211         int              sc_ileave;             /* interleave */
  212         int              sc_maxiosize;          /* maximum I/O size */
  213         u_int            sc_nccdisks;           /* number of components */
  214 #define CCD_MAXNDISKS    65536
  215         struct lock      sc_lock;
  216         struct ccdcinfo  *sc_cinfo;             /* component info */
  217         struct ccdiinfo  *sc_itable;            /* interleave table */
  218         struct devstat   device_stats;          /* device statistics */
  219         struct ccdgeom   sc_geom;               /* pseudo geometry info */
  220         struct disk      sc_disk;               /* disk overlay for ccd */
  221         struct cdev      *sc_dev;               /* raw ccd device */
  222         int              sc_pick;               /* side of mirror picked */
  223         off_t            sc_blk[2];             /* mirror localization */
  224 };
  225 
  226 /* sc_flags */
  227 #define CCDF_INITED     0x01    /* unit has been initialized */
  228 #define CCDF_UNUSED02   0x02    /* label area is writable */
  229 #define CCDF_UNUSED04   0x04    /* unit is currently being labelled */
  230 
  231 /*
  232  * Before you can use a unit, it must be configured with CCDIOCSET.
  233  * The configuration persists across opens and closes of the device;
  234  * a CCDIOCCLR must be used to reset a configuration.  An attempt to
  235  * CCDIOCSET an already active unit will return EBUSY.  Attempts to
  236  * CCDIOCCLR an inactive unit will return ENXIO.
  237  */
  238 #define CCDIOCSET       _IOWR('F', 16, struct ccd_ioctl)   /* enable ccd */
  239 #define CCDIOCCLR       _IOW('F', 17, struct ccd_ioctl)    /* disable ccd */
  240 
  241 #endif

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