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 1.30.10.1 2009/04/04 23:04:57 snj Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 1996, 1997, 1998, 1999, 2007, 2009 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  *
   19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   29  * POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 /*
   33  * Copyright (c) 1990, 1993
   34  *      The Regents of the University of California.  All rights reserved.
   35  *
   36  * This code is derived from software contributed to Berkeley by
   37  * the Systems Programming Group of the University of Utah Computer
   38  * Science Department.
   39  *
   40  * Redistribution and use in source and binary forms, with or without
   41  * modification, are permitted provided that the following conditions
   42  * are met:
   43  * 1. Redistributions of source code must retain the above copyright
   44  *    notice, this list of conditions and the following disclaimer.
   45  * 2. Redistributions in binary form must reproduce the above copyright
   46  *    notice, this list of conditions and the following disclaimer in the
   47  *    documentation and/or other materials provided with the distribution.
   48  * 3. Neither the name of the University nor the names of its contributors
   49  *    may be used to endorse or promote products derived from this software
   50  *    without specific prior written permission.
   51  *
   52  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   53  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   54  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   55  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   56  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   57  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   58  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   59  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   60  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   61  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   62  * SUCH DAMAGE.
   63  *
   64  * from: Utah $Hdr: cdvar.h 1.1 90/07/09$
   65  *
   66  *      @(#)cdvar.h     8.1 (Berkeley) 6/10/93
   67  */
   68 
   69 /*
   70  * Copyright (c) 1988 University of Utah.
   71  *
   72  * This code is derived from software contributed to Berkeley by
   73  * the Systems Programming Group of the University of Utah Computer
   74  * Science Department.
   75  *
   76  * Redistribution and use in source and binary forms, with or without
   77  * modification, are permitted provided that the following conditions
   78  * are met:
   79  * 1. Redistributions of source code must retain the above copyright
   80  *    notice, this list of conditions and the following disclaimer.
   81  * 2. Redistributions in binary form must reproduce the above copyright
   82  *    notice, this list of conditions and the following disclaimer in the
   83  *    documentation and/or other materials provided with the distribution.
   84  * 3. All advertising materials mentioning features or use of this software
   85  *    must display the following acknowledgement:
   86  *      This product includes software developed by the University of
   87  *      California, Berkeley and its contributors.
   88  * 4. Neither the name of the University nor the names of its contributors
   89  *    may be used to endorse or promote products derived from this software
   90  *    without specific prior written permission.
   91  *
   92  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   93  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   95  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   96  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   97  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   98  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   99  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  100  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  101  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  102  * SUCH DAMAGE.
  103  *
  104  * from: Utah $Hdr: cdvar.h 1.1 90/07/09$
  105  *
  106  *      @(#)cdvar.h     8.1 (Berkeley) 6/10/93
  107  */
  108 
  109 #ifndef _DEV_CCDVAR_H_
  110 #define _DEV_CCDVAR_H_
  111 
  112 #include <sys/buf.h>
  113 #include <sys/mutex.h>
  114 #include <sys/queue.h>
  115 #include <sys/condvar.h>
  116 
  117 /*
  118  * Dynamic configuration and disklabel support by:
  119  *      Jason R. Thorpe <thorpej@nas.nasa.gov>
  120  *      Numerical Aerodynamic Simulation Facility
  121  *      Mail Stop 258-6
  122  *      NASA Ames Research Center
  123  *      Moffett Field, CA 94035
  124  */
  125 
  126 /*
  127  * This structure is used to configure a ccd via ioctl(2).
  128  */
  129 struct ccd_ioctl {
  130         char    **ccio_disks;           /* pointer to component paths */
  131         u_int   ccio_ndisks;            /* number of disks to concatenate */
  132         int     ccio_ileave;            /* interleave (DEV_BSIZE blocks) */
  133         int     ccio_flags;             /* see sc_flags below */
  134         int     ccio_unit;              /* unit number: use varies */
  135         size_t  ccio_size;              /* (returned) size of ccd */
  136 };
  137 
  138 /*
  139  * Component info table.
  140  * Describes a single component of a concatenated disk.
  141  */
  142 struct ccdcinfo {
  143         struct vnode    *ci_vp;                 /* device's vnode */
  144         dev_t           ci_dev;                 /* XXX: device's dev_t */
  145         size_t          ci_size;                /* size */
  146         char            *ci_path;               /* path to component */
  147         size_t          ci_pathlen;             /* length of component path */
  148 };
  149 
  150 /*
  151  * Interleave description table.
  152  * Computed at boot time to speed irregular-interleave lookups.
  153  * The idea is that we interleave in "groups".  First we interleave
  154  * evenly over all component disks up to the size of the smallest
  155  * component (the first group), then we interleave evenly over all
  156  * remaining disks up to the size of the next-smallest (second group),
  157  * and so on.
  158  *
  159  * Each table entry describes the interleave characteristics of one
  160  * of these groups.  For example if a concatenated disk consisted of
  161  * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at
  162  * DEV_BSIZE (1), the table would have three entries:
  163  *
  164  *      ndisk   startblk        startoff        dev
  165  *      3       0               0               0, 1, 2
  166  *      2       9               3               0, 2
  167  *      1       13              5               2
  168  *      0       -               -               -
  169  *
  170  * which says that the first nine blocks (0-8) are interleaved over
  171  * 3 disks (0, 1, 2) starting at block offset 0 on any component disk,
  172  * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting
  173  * at component block 3, and the remaining blocks (13-14) are on disk
  174  * 2 starting at offset 5.
  175  */
  176 struct ccdiinfo {
  177         int     ii_ndisk;       /* # of disks range is interleaved over */
  178         daddr_t ii_startblk;    /* starting scaled block # for range */
  179         daddr_t ii_startoff;    /* starting component offset (block #) */
  180         int     *ii_index;      /* ordered list of components in range */
  181         size_t  ii_indexsz;     /* size of memory area */
  182 };
  183 
  184 /*
  185  * Concatenated disk pseudo-geometry information.
  186  */
  187 struct ccdgeom {
  188         u_int32_t       ccg_secsize;    /* # bytes per sector */
  189         u_int32_t       ccg_nsectors;   /* # data sectors per track */
  190         u_int32_t       ccg_ntracks;    /* # tracks per cylinder */
  191         u_int32_t       ccg_ncylinders; /* # cylinders per unit */
  192 };
  193 
  194 struct ccdbuf;
  195 
  196 /*
  197  * A concatenated disk is described after initialization by this structure.
  198  */
  199 struct ccd_softc {
  200         int              sc_flags;              /* flags */
  201         size_t           sc_size;               /* size of ccd */
  202         int              sc_ileave;             /* interleave */
  203         u_int            sc_nccdisks;           /* number of components */
  204 #define CCD_MAXNDISKS   65536
  205         struct ccdcinfo  *sc_cinfo;             /* component info */
  206         struct ccdiinfo  *sc_itable;            /* interleave table */
  207         struct ccdgeom   sc_geom;               /* pseudo geometry info */
  208         char             sc_xname[8];           /* XXX external name */
  209         struct disk      sc_dkdev;              /* generic disk device info */
  210         kmutex_t         sc_dvlock;             /* lock on device node */
  211 #if defined(_KERNEL) /* XXX ccdconfig(8) refers softc directly using kvm */
  212         struct bufq_state *sc_bufq;             /* buffer queue */
  213         kmutex_t         *sc_iolock;            /* lock on I/O start/stop */
  214         kcondvar_t       sc_stop;               /* when inflight goes zero */
  215         struct lwp       *sc_thread;            /* for deferred I/O */
  216         kcondvar_t       sc_push;               /* for deferred I/O */
  217         bool             sc_zap;                /* for deferred I/O */
  218 #endif
  219 };
  220 
  221 /* sc_flags */
  222 #define CCDF_UNIFORM    0x002   /* use LCCD of sizes for uniform interleave */
  223 #define CCDF_NOLABEL    0x004   /* ignore on-disk (raw) disklabel */
  224 
  225 #define CCDF_INITED     0x010   /* unit has been initialized */
  226 #define CCDF_WLABEL     0x020   /* label area is writable */
  227 #define CCDF_LABELLING  0x040   /* unit is currently being labelled */
  228 #define CCDF_KLABEL     0x080   /* keep label on close */
  229 #define CCDF_VLABEL     0x100   /* label is valid */
  230 #define CCDF_RLABEL     0x200   /* currently reading label */
  231 
  232 /* Mask of user-settable ccd flags. */
  233 #define CCDF_USERMASK   (CCDF_UNIFORM|CCDF_NOLABEL)
  234 
  235 /*
  236  * Before you can use a unit, it must be configured with CCDIOCSET.
  237  * The configuration persists across opens and closes of the device;
  238  * a CCDIOCCLR must be used to reset a configuration.  An attempt to
  239  * CCDIOCSET an already active unit will return EBUSY.  Attempts to
  240  * CCDIOCCLR an inactive unit will return ENXIO.
  241  */
  242 #define CCDIOCSET       _IOWR('F', 16, struct ccd_ioctl)   /* enable ccd */
  243 #define CCDIOCCLR       _IOW('F', 17, struct ccd_ioctl)    /* disable ccd */
  244 
  245 #endif /* _DEV_CCDVAR_H_ */

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