/*      $NetBSD: ccdvar.h,v 1.37 2018/03/18 20:33:52 christos Exp $     */

/*-
* Copyright (c) 1996, 1997, 1998, 1999, 2007, 2009 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

/*
* 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. 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
*/

#ifndef _DEV_CCDVAR_H_
#define _DEV_CCDVAR_H_

#include <sys/ioccom.h>
#ifdef _KERNEL
#include <sys/buf.h>
#include <sys/mutex.h>
#include <sys/queue.h>
#include <sys/condvar.h>
#endif

/*
* Dynamic configuration and disklabel support by:
*      Jason R. Thorpe <[email protected]>
*      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;             /* see sc_flags below */
       int     ccio_unit;              /* unit number: use varies */
       uint64_t        ccio_size;      /* (returned) size of ccd */
};

#ifdef _KERNEL

/*
* 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 */
       uint64_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 */
       size_t  ii_indexsz;     /* size of memory area */
};

/*
* 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 */
};

struct ccdbuf;

/*
* A concatenated disk is described after initialization by this structure.
*/
struct ccd_softc {
       int              sc_unit;
       int              sc_flags;              /* flags */
       uint64_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 ccdgeom   sc_geom;               /* pseudo geometry info */
       char             sc_xname[8];           /* XXX external name */
       struct disk      sc_dkdev;              /* generic disk device info */
       kmutex_t         sc_dvlock;             /* lock on device node */
       struct bufq_state *sc_bufq;             /* buffer queue */
       kmutex_t         *sc_iolock;            /* lock on I/O start/stop */
       kcondvar_t       sc_stop;               /* when inflight goes zero */
       struct lwp       *sc_thread;            /* for deferred I/O */
       kcondvar_t       sc_push;               /* for deferred I/O */
       bool             sc_zap;                /* for deferred I/O */
       LIST_ENTRY(ccd_softc) sc_link;
};

#endif /* _KERNEL */

/* sc_flags */
#define CCDF_UNIFORM    0x002   /* use LCCD of sizes for uniform interleave */
#define CCDF_NOLABEL    0x004   /* ignore on-disk (raw) disklabel */

#define CCDF_INITED     0x010   /* unit has been initialized */
#define CCDF_WLABEL     0x020   /* label area is writable */
#define CCDF_LABELLING  0x040   /* unit is currently being labelled */
#define CCDF_KLABEL     0x080   /* keep label on close */
#define CCDF_VLABEL     0x100   /* label is valid */
#define CCDF_RLABEL     0x200   /* currently reading label */

/* Mask of user-settable ccd flags. */
#define CCDF_USERMASK   (CCDF_UNIFORM|CCDF_NOLABEL)

/*
* 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 */

/*
* Sysctl information
*/
struct ccddiskinfo {
       int ccd_ileave;
       u_int ccd_ndisks;
       uint64_t ccd_size;
       int ccd_flags;
};

#endif /* _DEV_CCDVAR_H_ */

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