NetBSD/sys/dev/raidframe/rf_netbsdkintf.c

/*	$NetBSD: rf_netbsdkintf.c,v 1.23 1999/08/10 21:41:37 oster Exp $	*/
/*-
 * Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Greg Oster; 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation 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 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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 $Hdr: cd.c 1.6 90/11/28$
 *
 *      @(#)cd.c        8.2 (Berkeley) 11/16/93
 */




/*
 * Copyright (c) 1995 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Authors: Mark Holland, Jim Zelenka
 *
 * Permission to use, copy, modify and distribute this software and
 * its documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 *
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * Carnegie Mellon requests users of this software to return to
 *
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
 *  Carnegie Mellon University
 *  Pittsburgh PA 15213-3890
 *
 * any improvements or extensions that they make and grant Carnegie the
 * rights to redistribute these changes.
 */

/***********************************************************
 *
 * rf_kintf.c -- the kernel interface routines for RAIDframe
 *
 ***********************************************************/

#include <sys/errno.h>
#include <sys/param.h>
#include <sys/pool.h>
#include <sys/queue.h>
#include <sys/disk.h>
#include <sys/device.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/fcntl.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/param.h>
#include <sys/types.h>
#include <machine/types.h>
#include <sys/disklabel.h>
#include <sys/conf.h>
#include <sys/lock.h>
#include <sys/buf.h>
#include <sys/user.h>

#include "raid.h"
#include "rf_raid.h"
#include "rf_raidframe.h"
#include "rf_dag.h"
#include "rf_dagflags.h"
#include "rf_diskqueue.h"
#include "rf_acctrace.h"
#include "rf_etimer.h"
#include "rf_general.h"
#include "rf_debugMem.h"
#include "rf_kintf.h"
#include "rf_options.h"
#include "rf_driver.h"
#include "rf_parityscan.h"
#include "rf_debugprint.h"
#include "rf_threadstuff.h"

int     rf_kdebug_level = 0;

#define RFK_BOOT_NONE 0
#define RFK_BOOT_GOOD 1
#define RFK_BOOT_BAD  2
static int rf_kbooted = RFK_BOOT_NONE;

#ifdef DEBUG
#define db0_printf(a) printf a
#define db_printf(a) if (rf_kdebug_level > 0) printf a
#define db1_printf(a) if (rf_kdebug_level > 0) printf a
#define db2_printf(a) if (rf_kdebug_level > 1) printf a
#define db3_printf(a) if (rf_kdebug_level > 2) printf a
#define db4_printf(a) if (rf_kdebug_level > 3) printf a
#define db5_printf(a) if (rf_kdebug_level > 4) printf a
#else				/* DEBUG */
#define db0_printf(a) printf a
#define db1_printf(a) { }
#define db2_printf(a) { }
#define db3_printf(a) { }
#define db4_printf(a) { }
#define db5_printf(a) { }
#endif				/* DEBUG */

static RF_Raid_t **raidPtrs;	/* global raid device descriptors */

RF_DECLARE_STATIC_MUTEX(rf_sparet_wait_mutex)

static RF_SparetWait_t *rf_sparet_wait_queue;	/* requests to install a
						 * spare table */
static RF_SparetWait_t *rf_sparet_resp_queue;	/* responses from
						 * installation process */

static struct rf_recon_req *recon_queue = NULL;	/* used to communicate
						 * reconstruction
						 * requests */


decl_simple_lock_data(, recon_queue_mutex)
#define LOCK_RECON_Q_MUTEX() simple_lock(&recon_queue_mutex)
#define UNLOCK_RECON_Q_MUTEX() simple_unlock(&recon_queue_mutex)

/* prototypes */
static void KernelWakeupFunc(struct buf * bp);
static void InitBP(struct buf * bp, struct vnode *, unsigned rw_flag, 
		   dev_t dev, RF_SectorNum_t startSect, 
		   RF_SectorCount_t numSect, caddr_t buf,
		   void (*cbFunc) (struct buf *), void *cbArg, 
		   int logBytesPerSector, struct proc * b_proc);

#define Dprintf0(s)       if (rf_queueDebug) \
     rf_debug_printf(s,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL)
#define Dprintf1(s,a)     if (rf_queueDebug) \
     rf_debug_printf(s,a,NULL,NULL,NULL,NULL,NULL,NULL,NULL)
#define Dprintf2(s,a,b)   if (rf_queueDebug) \
     rf_debug_printf(s,a,b,NULL,NULL,NULL,NULL,NULL,NULL)
#define Dprintf3(s,a,b,c) if (rf_queueDebug) \
     rf_debug_printf(s,a,b,c,NULL,NULL,NULL,NULL,NULL)

int raidmarkclean(dev_t dev, struct vnode *b_vp, int);
int raidmarkdirty(dev_t dev, struct vnode *b_vp, int);

void raidattach __P((int));
int raidsize __P((dev_t));

void    rf_DiskIOComplete(RF_DiskQueue_t *, RF_DiskQueueData_t *, int);
void    rf_CopybackReconstructedData(RF_Raid_t * raidPtr);
static int raidinit __P((dev_t, RF_Raid_t *, int));

int raidopen __P((dev_t, int, int, struct proc *));
int raidclose __P((dev_t, int, int, struct proc *));
int raidioctl __P((dev_t, u_long, caddr_t, int, struct proc *));
int raidwrite __P((dev_t, struct uio *, int));
int raidread __P((dev_t, struct uio *, int));
void raidstrategy __P((struct buf *));
int raiddump __P((dev_t, daddr_t, caddr_t, size_t));

int raidwrite_component_label(dev_t, struct vnode *, RF_ComponentLabel_t *);
int raidread_component_label(dev_t, struct vnode *, RF_ComponentLabel_t *);
void rf_update_component_labels( RF_Raid_t *);
/*
 * Pilfered from ccd.c
 */

struct raidbuf {
	struct buf rf_buf;	/* new I/O buf.  MUST BE FIRST!!! */
	struct buf *rf_obp;	/* ptr. to original I/O buf */
	int     rf_flags;	/* misc. flags */
	RF_DiskQueueData_t *req;/* the request that this was part of.. */
};


#define RAIDGETBUF(rs) pool_get(&(rs)->sc_cbufpool, PR_NOWAIT)
#define	RAIDPUTBUF(rs, cbp) pool_put(&(rs)->sc_cbufpool, cbp)

/* XXX Not sure if the following should be replacing the raidPtrs above,
   or if it should be used in conjunction with that... */

struct raid_softc {
	int     sc_flags;	/* flags */
	int     sc_cflags;	/* configuration flags */
	size_t  sc_size;        /* size of the raid device */
	dev_t   sc_dev;	        /* our device.. */
	char    sc_xname[20];	/* XXX external name */
	struct disk sc_dkdev;	/* generic disk device info */
	struct pool sc_cbufpool;	/* component buffer pool */
};
/* sc_flags */
#define RAIDF_INITED	0x01	/* unit has been initialized */
#define RAIDF_WLABEL	0x02	/* label area is writable */
#define RAIDF_LABELLING	0x04	/* unit is currently being labelled */
#define RAIDF_WANTED	0x40	/* someone is waiting to obtain a lock */
#define RAIDF_LOCKED	0x80	/* unit is locked */

#define	raidunit(x)	DISKUNIT(x)
static int numraid = 0;

/* 
 * Allow RAIDOUTSTANDING number of simultaneous IO's to this RAID device. 
 * Be aware that large numbers can allow the driver to consume a lot of 
 * kernel memory, especially on writes... 
 */

#ifndef RAIDOUTSTANDING
#define RAIDOUTSTANDING   10
#endif

#define RAIDLABELDEV(dev)	\
	(MAKEDISKDEV(major((dev)), raidunit((dev)), RAW_PART))

/* declared here, and made public, for the benefit of KVM stuff.. */
struct raid_softc *raid_softc;

static void raidgetdefaultlabel __P((RF_Raid_t *, struct raid_softc *, 
				     struct disklabel *));
static void raidgetdisklabel __P((dev_t));
static void raidmakedisklabel __P((struct raid_softc *));

static int raidlock __P((struct raid_softc *));
static void raidunlock __P((struct raid_softc *));
int raidlookup __P((char *, struct proc * p, struct vnode **));

static void rf_markalldirty __P((RF_Raid_t *));

void
raidattach(num)
	int     num;
{
	int raidID;
	int i, rc;

#ifdef DEBUG
	printf("raidattach: Asked for %d units\n", num);
#endif

	if (num <= 0) {
#ifdef DIAGNOSTIC
		panic("raidattach: count <= 0");
#endif
		return;
	}
	/* This is where all the initialization stuff gets done. */

	/* Make some space for requested number of units... */

	RF_Calloc(raidPtrs, num, sizeof(RF_Raid_t *), (RF_Raid_t **));
	if (raidPtrs == NULL) {
		panic("raidPtrs is NULL!!\n");
	}
	
	rc = rf_mutex_init(&rf_sparet_wait_mutex);
	if (rc) {
		RF_PANIC();
	}

	rf_sparet_wait_queue = rf_sparet_resp_queue = NULL;
	recon_queue = NULL;

	for (i = 0; i < numraid; i++)
		raidPtrs[i] = NULL;
	rc = rf_BootRaidframe();
	if (rc == 0)
		printf("Kernelized RAIDframe activated\n");
	else
		panic("Serious error booting RAID!!\n");

	rf_kbooted = RFK_BOOT_GOOD;

	/* put together some datastructures like the CCD device does.. This
	 * lets us lock the device and what-not when it gets opened. */

	raid_softc = (struct raid_softc *)
	    malloc(num * sizeof(struct raid_softc),
	    M_RAIDFRAME, M_NOWAIT);
	if (raid_softc == NULL) {
		printf("WARNING: no memory for RAIDframe driver\n");
		return;
	}
	numraid = num;
	bzero(raid_softc, num * sizeof(struct raid_softc));
	
	for (raidID = 0; raidID < num; raidID++) {
		RF_Calloc(raidPtrs[raidID], 1, sizeof(RF_Raid_t),
			  (RF_Raid_t *));
		if (raidPtrs[raidID] == NULL) {
			printf("raidPtrs[%d] is NULL\n", raidID);
		}
	}
}


int
raidsize(dev)
	dev_t   dev;
{
	struct raid_softc *rs;
	struct disklabel *lp;
	int     part, unit, omask, size;

	unit = raidunit(dev);
	if (unit >= numraid)
		return (-1);
	rs = &raid_softc[unit];

	if ((rs->sc_flags & RAIDF_INITED) == 0)
		return (-1);

	part = DISKPART(dev);
	omask = rs->sc_dkdev.dk_openmask & (1 << part);
	lp = rs->sc_dkdev.dk_label;

	if (omask == 0 && raidopen(dev, 0, S_IFBLK, curproc))
		return (-1);

	if (lp->d_partitions[part].p_fstype != FS_SWAP)
		size = -1;
	else
		size = lp->d_partitions[part].p_size *
		    (lp->d_secsize / DEV_BSIZE);

	if (omask == 0 && raidclose(dev, 0, S_IFBLK, curproc))
		return (-1);

	return (size);

}

int
raiddump(dev, blkno, va, size)
	dev_t   dev;
	daddr_t blkno;
	caddr_t va;
	size_t  size;
{
	/* Not implemented. */
	return ENXIO;
}
/* ARGSUSED */
int
raidopen(dev, flags, fmt, p)
	dev_t   dev;
	int     flags, fmt;
	struct proc *p;
{
	int     unit = raidunit(dev);
	struct raid_softc *rs;
	struct disklabel *lp;
	int     part, pmask;
	int     error = 0;

	if (unit >= numraid)
		return (ENXIO);
	rs = &raid_softc[unit];

	if ((error = raidlock(rs)) != 0)
		return (error);
	lp = rs->sc_dkdev.dk_label;

	part = DISKPART(dev);
	pmask = (1 << part);

	db1_printf(("Opening raid device number: %d partition: %d\n",
		unit, part));


	if ((rs->sc_flags & RAIDF_INITED) &&
	    (rs->sc_dkdev.dk_openmask == 0))
		raidgetdisklabel(dev);

	/* make sure that this partition exists */

	if (part != RAW_PART) {
		db1_printf(("Not a raw partition..\n"));
		if (((rs->sc_flags & RAIDF_INITED) == 0) ||
		    ((part >= lp->d_npartitions) ||
			(lp->d_partitions[part].p_fstype == FS_UNUSED))) {
			error = ENXIO;
			raidunlock(rs);
			db1_printf(("Bailing out...\n"));
			return (error);
		}
	}
	/* Prevent this unit from being unconfigured while open. */
	switch (fmt) {
	case S_IFCHR:
		rs->sc_dkdev.dk_copenmask |= pmask;
		break;

	case S_IFBLK:
		rs->sc_dkdev.dk_bopenmask |= pmask;
		break;
	}

	if ((rs->sc_dkdev.dk_openmask == 0) && 
	    ((rs->sc_flags & RAIDF_INITED) != 0)) {
		/* First one... mark things as dirty... Note that we *MUST*
		 have done a configure before this.  I DO NOT WANT TO BE
		 SCRIBBLING TO RANDOM COMPONENTS UNTIL IT'S BEEN DETERMINED
		 THAT THEY BELONG TOGETHER!!!!! */
		/* XXX should check to see if we're only open for reading
		   here... If so, we needn't do this, but then need some
		   other way of keeping track of what's happened.. */

		rf_markalldirty( raidPtrs[unit] );
	}


	rs->sc_dkdev.dk_openmask =
	    rs->sc_dkdev.dk_copenmask | rs->sc_dkdev.dk_bopenmask;

	raidunlock(rs);

	return (error);


}
/* ARGSUSED */
int
raidclose(dev, flags, fmt, p)
	dev_t   dev;
	int     flags, fmt;
	struct proc *p;
{
	int     unit = raidunit(dev);
	struct raid_softc *rs;
	int     error = 0;
	int     part;

	if (unit >= numraid)
		return (ENXIO);
	rs = &raid_softc[unit];

	if ((error = raidlock(rs)) != 0)
		return (error);

	part = DISKPART(dev);

	/* ...that much closer to allowing unconfiguration... */
	switch (fmt) {
	case S_IFCHR:
		rs->sc_dkdev.dk_copenmask &= ~(1 << part);
		break;

	case S_IFBLK:
		rs->sc_dkdev.dk_bopenmask &= ~(1 << part);
		break;
	}
	rs->sc_dkdev.dk_openmask =
	    rs->sc_dkdev.dk_copenmask | rs->sc_dkdev.dk_bopenmask;
	
	if ((rs->sc_dkdev.dk_openmask == 0) &&
	    ((rs->sc_flags & RAIDF_INITED) != 0)) {
		/* Last one... device is not unconfigured yet.  
		   Device shutdown has taken care of setting the 
		   clean bits if RAIDF_INITED is not set 
		   mark things as clean... */
		rf_update_component_labels( raidPtrs[unit] );
	}

	raidunlock(rs);
	return (0);

}

void
raidstrategy(bp)
	register struct buf *bp;
{
	register int s;

	unsigned int raidID = raidunit(bp->b_dev);
	RF_Raid_t *raidPtr;
	struct raid_softc *rs = &raid_softc[raidID];
	struct disklabel *lp;
	int     wlabel;

#if 0
	db1_printf(("Strategy: 0x%x 0x%x\n", bp, bp->b_data));
	db1_printf(("Strategy(2): bp->b_bufsize%d\n", (int) bp->b_bufsize));
	db1_printf(("bp->b_count=%d\n", (int) bp->b_bcount));
	db1_printf(("bp->b_resid=%d\n", (int) bp->b_resid));
	db1_printf(("bp->b_blkno=%d\n", (int) bp->b_blkno));

	if (bp->b_flags & B_READ)
		db1_printf(("READ\n"));
	else
		db1_printf(("WRITE\n"));
#endif
	if (rf_kbooted != RFK_BOOT_GOOD)
		return;
	if (raidID >= numraid || !raidPtrs[raidID]) {
		bp->b_error = ENODEV;
		bp->b_flags |= B_ERROR;
		bp->b_resid = bp->b_bcount;
		biodone(bp);
		return;
	}
	raidPtr = raidPtrs[raidID];
	if (!raidPtr->valid) {
		bp->b_error = ENODEV;
		bp->b_flags |= B_ERROR;
		bp->b_resid = bp->b_bcount;
		biodone(bp);
		return;
	}
	if (bp->b_bcount == 0) {
		db1_printf(("b_bcount is zero..\n"));
		biodone(bp);
		return;
	}
	lp = rs->sc_dkdev.dk_label;

	/*
	 * Do bounds checking and adjust transfer.  If there's an
	 * error, the bounds check will flag that for us.
	 */

	wlabel = rs->sc_flags & (RAIDF_WLABEL | RAIDF_LABELLING);
	if (DISKPART(bp->b_dev) != RAW_PART)
		if (bounds_check_with_label(bp, lp, wlabel) <= 0) {
			db1_printf(("Bounds check failed!!:%d %d\n",
				(int) bp->b_blkno, (int) wlabel));
			biodone(bp);
			return;
		}
	s = splbio();		/* XXX Needed? */
	db1_printf(("Beginning strategy...\n"));

	bp->b_resid = 0;
	bp->b_error = rf_DoAccessKernel(raidPtrs[raidID], bp,
	    NULL, NULL, NULL);
	if (bp->b_error) {
		bp->b_flags |= B_ERROR;
		db1_printf(("bp->b_flags HAS B_ERROR SET!!!: %d\n",
			bp->b_error));
	}
	splx(s);
#if 0
	db1_printf(("Strategy exiting: 0x%x 0x%x %d %d\n",
		bp, bp->b_data,
		(int) bp->b_bcount, (int) bp->b_resid));
#endif
}
/* ARGSUSED */
int
raidread(dev, uio, flags)
	dev_t   dev;
	struct uio *uio;
	int     flags;
{
	int     unit = raidunit(dev);
	struct raid_softc *rs;
	int     part;

	if (unit >= numraid)
		return (ENXIO);
	rs = &raid_softc[unit];

	if ((rs->sc_flags & RAIDF_INITED) == 0)
		return (ENXIO);
	part = DISKPART(dev);

	db1_printf(("raidread: unit: %d partition: %d\n", unit, part));

	return (physio(raidstrategy, NULL, dev, B_READ, minphys, uio));

}
/* ARGSUSED */
int
raidwrite(dev, uio, flags)
	dev_t   dev;
	struct uio *uio;
	int     flags;
{
	int     unit = raidunit(dev);
	struct raid_softc *rs;

	if (unit >= numraid)
		return (ENXIO);
	rs = &raid_softc[unit];

	if ((rs->sc_flags & RAIDF_INITED) == 0)
		return (ENXIO);
	db1_printf(("raidwrite\n"));
	return (physio(raidstrategy, NULL, dev, B_WRITE, minphys, uio));

}

int
raidioctl(dev, cmd, data, flag, p)
	dev_t   dev;
	u_long  cmd;
	caddr_t data;
	int     flag;
	struct proc *p;
{
	int     unit = raidunit(dev);
	int     error = 0;
	int     part, pmask;
	struct raid_softc *rs;
#if 0
	int     r, c;
#endif
	/* struct raid_ioctl *ccio = (struct ccd_ioctl *)data; */

	/* struct ccdbuf *cbp; */
	/* struct raidbuf *raidbp; */
	RF_Config_t *k_cfg, *u_cfg;
	u_char *specific_buf;
	int retcode = 0;
	int row;
	int column;
	int s;
	struct rf_recon_req *rrcopy, *rr;
	RF_ComponentLabel_t *component_label;
	RF_ComponentLabel_t ci_label;
	RF_ComponentLabel_t **c_label_ptr;
	RF_SingleComponent_t *sparePtr,*componentPtr;
	RF_SingleComponent_t hot_spare;
	RF_SingleComponent_t component;

	if (unit >= numraid)
		return (ENXIO);
	rs = &raid_softc[unit];

	db1_printf(("raidioctl: %d %d %d %d\n", (int) dev,
		(int) DISKPART(dev), (int) unit, (int) cmd));

	/* Must be open for writes for these commands... */
	switch (cmd) {
	case DIOCSDINFO:
	case DIOCWDINFO:
	case DIOCWLABEL:
		if ((flag & FWRITE) == 0)
			return (EBADF);
	}

	/* Must be initialized for these... */
	switch (cmd) {
	case DIOCGDINFO:
	case DIOCSDINFO:
	case DIOCWDINFO:
	case DIOCGPART:
	case DIOCWLABEL:
	case DIOCGDEFLABEL:
	case RAIDFRAME_SHUTDOWN:
	case RAIDFRAME_REWRITEPARITY:
	case RAIDFRAME_GET_INFO:
	case RAIDFRAME_RESET_ACCTOTALS:
	case RAIDFRAME_GET_ACCTOTALS:
	case RAIDFRAME_KEEP_ACCTOTALS:
	case RAIDFRAME_GET_SIZE:
	case RAIDFRAME_FAIL_DISK:
	case RAIDFRAME_COPYBACK:
	case RAIDFRAME_CHECKRECON:
	case RAIDFRAME_GET_COMPONENT_LABEL:
	case RAIDFRAME_SET_COMPONENT_LABEL:
	case RAIDFRAME_ADD_HOT_SPARE:
	case RAIDFRAME_REMOVE_HOT_SPARE:
	case RAIDFRAME_INIT_LABELS:
	case RAIDFRAME_REBUILD_IN_PLACE:
	case RAIDFRAME_CHECK_PARITY:
		if ((rs->sc_flags & RAIDF_INITED) == 0)
			return (ENXIO);
	}

	switch (cmd) {


		/* configure the system */
	case RAIDFRAME_CONFIGURE:

		db3_printf(("rf_ioctl: RAIDFRAME_CONFIGURE\n"));
		/* copy-in the configuration information */
		/* data points to a pointer to the configuration structure */
		u_cfg = *((RF_Config_t **) data);
		RF_Malloc(k_cfg, sizeof(RF_Config_t), (RF_Config_t *));
		if (k_cfg == NULL) {
			db3_printf(("rf_ioctl: ENOMEM for config. Code is %d\n", retcode));
			return (ENOMEM);
		}
		retcode = copyin((caddr_t) u_cfg, (caddr_t) k_cfg,
		    sizeof(RF_Config_t));
		if (retcode) {
			db3_printf(("rf_ioctl: retcode=%d copyin.1\n",
				retcode));
			return (retcode);
		}
		/* allocate a buffer for the layout-specific data, and copy it
		 * in */
		if (k_cfg->layoutSpecificSize) {
			if (k_cfg->layoutSpecificSize > 10000) {
				/* sanity check */
				db3_printf(("rf_ioctl: EINVAL %d\n", retcode));
				return (EINVAL);
			}
			RF_Malloc(specific_buf, k_cfg->layoutSpecificSize,
			    (u_char *));
			if (specific_buf == NULL) {
				RF_Free(k_cfg, sizeof(RF_Config_t));
				db3_printf(("rf_ioctl: ENOMEM %d\n", retcode));
				return (ENOMEM);
			}
			retcode = copyin(k_cfg->layoutSpecific,
			    (caddr_t) specific_buf,
			    k_cfg->layoutSpecificSize);
			if (retcode) {
				db3_printf(("rf_ioctl: retcode=%d copyin.2\n",
					retcode));
				return (retcode);
			}
		} else
			specific_buf = NULL;
		k_cfg->layoutSpecific = specific_buf;

		/* should do some kind of sanity check on the configuration.
		 * Store the sum of all the bytes in the last byte? */

#if 0
		db1_printf(("Considering configuring the system.:%d 0x%x\n",
			unit, p));
#endif

		/* We need the pointer to this a little deeper, so stash it
		 * here... */

		raidPtrs[unit]->proc = p;

		/* configure the system */

		raidPtrs[unit]->raidid = unit;

		retcode = rf_Configure(raidPtrs[unit], k_cfg);

		/* allow this many simultaneous IO's to this RAID device */
		raidPtrs[unit]->openings = RAIDOUTSTANDING;

		if (retcode == 0) {
			retcode = raidinit(dev, raidPtrs[unit], unit);
			rf_markalldirty( raidPtrs[unit] );
		}
		/* free the buffers.  No return code here. */
		if (k_cfg->layoutSpecificSize) {
			RF_Free(specific_buf, k_cfg->layoutSpecificSize);
		}
		RF_Free(k_cfg, sizeof(RF_Config_t));

		db3_printf(("rf_ioctl: retcode=%d RAIDFRAME_CONFIGURE\n",
			retcode));

		return (retcode);

		/* shutdown the system */
	case RAIDFRAME_SHUTDOWN:

		if ((error = raidlock(rs)) != 0)
			return (error);

		/*
		 * If somebody has a partition mounted, we shouldn't
		 * shutdown.
		 */

		part = DISKPART(dev);
		pmask = (1 << part);
		if ((rs->sc_dkdev.dk_openmask & ~pmask) ||
		    ((rs->sc_dkdev.dk_bopenmask & pmask) &&
			(rs->sc_dkdev.dk_copenmask & pmask))) {
			raidunlock(rs);
			return (EBUSY);
		}

		if (rf_debugKernelAccess) {
			printf("call shutdown\n");
		}
		raidPtrs[unit]->proc = p;	/* XXX  necessary evil */

		retcode = rf_Shutdown(raidPtrs[unit]);

		db1_printf(("Done main shutdown\n"));

		pool_destroy(&rs->sc_cbufpool);
		db1_printf(("Done freeing component buffer freelist\n"));

		/* It's no longer initialized... */
		rs->sc_flags &= ~RAIDF_INITED;

		/* Detach the disk. */
		disk_detach(&rs->sc_dkdev);

		raidunlock(rs);

		return (retcode);
	case RAIDFRAME_GET_COMPONENT_LABEL:
		c_label_ptr = (RF_ComponentLabel_t **) data;
		/* need to read the component label for the disk indicated
		   by row,column in component_label
		   XXX need to sanity check these values!!! 
		   */

		/* For practice, let's get it directly fromdisk, rather 
		   than from the in-core copy */
		RF_Malloc( component_label, sizeof( RF_ComponentLabel_t ),
			   (RF_ComponentLabel_t *));
		if (component_label == NULL)
			return (ENOMEM);

		bzero((char *) component_label, sizeof(RF_ComponentLabel_t));
		
		retcode = copyin( *c_label_ptr, component_label, 
				  sizeof(RF_ComponentLabel_t));

		if (retcode) {
			return(retcode);
		}

		row = component_label->row;
		printf("Row: %d\n",row);
		if (row > raidPtrs[unit]->numRow) {
			row = 0; /* XXX */
		}
		column = component_label->column;
		printf("Column: %d\n",column);
		if (column > raidPtrs[unit]->numCol) {
			column = 0; /* XXX */
		}

		raidread_component_label( 
                              raidPtrs[unit]->Disks[row][column].dev, 
			      raidPtrs[unit]->raid_cinfo[row][column].ci_vp, 
			      component_label );

		retcode = copyout((caddr_t) component_label, 
				  (caddr_t) *c_label_ptr,
				  sizeof(RF_ComponentLabel_t));
		RF_Free( component_label, sizeof(RF_ComponentLabel_t));
		return (retcode);

	case RAIDFRAME_SET_COMPONENT_LABEL:
		component_label = (RF_ComponentLabel_t *) data;

		/* XXX check the label for valid stuff... */
		/* Note that some things *should not* get modified --
		   the user should be re-initing the labels instead of 
		   trying to patch things.
		   */

		printf("Got component label:\n");
		printf("Version: %d\n",component_label->version);
		printf("Serial Number: %d\n",component_label->serial_number);
		printf("Mod counter: %d\n",component_label->mod_counter);
		printf("Row: %d\n", component_label->row);
		printf("Column: %d\n", component_label->column);
		printf("Num Rows: %d\n", component_label->num_rows);
		printf("Num Columns: %d\n", component_label->num_columns);
		printf("Clean: %d\n", component_label->clean);
		printf("Status: %d\n", component_label->status);

		row = component_label->row;
		column = component_label->column;

		if ((row < 0) || (row > raidPtrs[unit]->numRow) ||
		    (column < 0) || (column > raidPtrs[unit]->numCol)) {
			return(EINVAL);
		}

		/* XXX this isn't allowed to do anything for now :-) */
#if 0
		raidwrite_component_label( 
                            raidPtrs[unit]->Disks[row][column].dev, 
			    raidPtrs[unit]->raid_cinfo[row][column].ci_vp, 
			    component_label );
#endif
		return (0);

	case RAIDFRAME_INIT_LABELS:	
		component_label = (RF_ComponentLabel_t *) data;
		/* 
		   we only want the serial number from
		   the above.  We get all the rest of the information
		   from the config that was used to create this RAID
		   set. 
		   */

		raidPtrs[unit]->serial_number = component_label->serial_number;
		/* current version number */
		ci_label.version = RF_COMPONENT_LABEL_VERSION; 
		ci_label.serial_number = component_label->serial_number;
		ci_label.mod_counter = raidPtrs[unit]->mod_counter;
		ci_label.num_rows = raidPtrs[unit]->numRow;
		ci_label.num_columns = raidPtrs[unit]->numCol;
		ci_label.clean = RF_RAID_DIRTY; /* not clean */
		ci_label.status = rf_ds_optimal; /* "It's good!" */

		for(row=0;row<raidPtrs[unit]->numRow;row++) {
			ci_label.row = row;
			for(column=0;column<raidPtrs[unit]->numCol;column++) {
				ci_label.column = column;
				raidwrite_component_label( 
				  raidPtrs[unit]->Disks[row][column].dev, 
				  raidPtrs[unit]->raid_cinfo[row][column].ci_vp, 
				  &ci_label );
			}
		}

		return (retcode);

		/* initialize all parity */
	case RAIDFRAME_REWRITEPARITY:

		if (raidPtrs[unit]->Layout.map->faultsTolerated == 0) {
			/* Parity for RAID 0 is trivially correct */
			raidPtrs[unit]->parity_good = RF_RAID_CLEAN;
			return(0);
		}

		/* borrow the thread of the requesting process */
		raidPtrs[unit]->proc = p;	/* Blah... :-p GO */
		s = splbio();
		retcode = rf_RewriteParity(raidPtrs[unit]);
		splx(s);
		/* return I/O Error if the parity rewrite fails */

		if (retcode) {
			retcode = EIO;
		} else {
			/* set the clean bit!  If we shutdown correctly,
			 the clean bit on each component label will get
			 set */
			raidPtrs[unit]->parity_good = RF_RAID_CLEAN;
		}
		return (retcode);


	case RAIDFRAME_ADD_HOT_SPARE:
		sparePtr = (RF_SingleComponent_t *) data;
		memcpy( &hot_spare, sparePtr, sizeof(RF_SingleComponent_t));
		printf("Adding spare\n");
		raidPtrs[unit]->proc = p;	/* Blah... :-p GO */
		retcode = rf_add_hot_spare(raidPtrs[unit], &hot_spare);
		return(retcode);

	case RAIDFRAME_REMOVE_HOT_SPARE:
		return(retcode);

	case RAIDFRAME_REBUILD_IN_PLACE:
		componentPtr = (RF_SingleComponent_t *) data;
		memcpy( &component, componentPtr, 
			sizeof(RF_SingleComponent_t));
		row = component.row;
		column = component.column;
		printf("Rebuild: %d %d\n",row, column);
		if ((row < 0) || (row > raidPtrs[unit]->numRow) ||
		    (column < 0) || (column > raidPtrs[unit]->numCol)) {
			return(EINVAL);
		}
		printf("Attempting a rebuild in place\n");
		s = splbio();
		raidPtrs[unit]->proc = p;	/* Blah... :-p GO */
		retcode = rf_ReconstructInPlace(raidPtrs[unit], row, column);
		splx(s);
		return(retcode);

		/* issue a test-unit-ready through raidframe to the indicated
		 * device */
#if 0				/* XXX not supported yet (ever?) */
	case RAIDFRAME_TUR:
		/* debug only */
		retcode = rf_SCSI_DoTUR(0, 0, 0, 0, *(dev_t *) data);
		return (retcode);
#endif
	case RAIDFRAME_GET_INFO:
		{
			RF_Raid_t *raid = raidPtrs[unit];
			RF_DeviceConfig_t *cfg, **ucfgp;
			int     i, j, d;

			if (!raid->valid)
				return (ENODEV);
			ucfgp = (RF_DeviceConfig_t **) data;
			RF_Malloc(cfg, sizeof(RF_DeviceConfig_t),
				  (RF_DeviceConfig_t *));
			if (cfg == NULL)
				return (ENOMEM);
			bzero((char *) cfg, sizeof(RF_DeviceConfig_t));
			cfg->rows = raid->numRow;
			cfg->cols = raid->numCol;
			cfg->ndevs = raid->numRow * raid->numCol;
			if (cfg->ndevs >= RF_MAX_DISKS) {
				cfg->ndevs = 0;
				return (ENOMEM);
			}
			cfg->nspares = raid->numSpare;
			if (cfg->nspares >= RF_MAX_DISKS) {
				cfg->nspares = 0;
				return (ENOMEM);
			}
			cfg->maxqdepth = raid->maxQueueDepth;
			d = 0;
			for (i = 0; i < cfg->rows; i++) {
				for (j = 0; j < cfg->cols; j++) {
					cfg->devs[d] = raid->Disks[i][j];
					d++;
				}
			}
			for (j = cfg->cols, i = 0; i < cfg->nspares; i++, j++) {
				cfg->spares[i] = raid->Disks[0][j];
			}
			retcode = copyout((caddr_t) cfg, (caddr_t) * ucfgp,
					  sizeof(RF_DeviceConfig_t));
			RF_Free(cfg, sizeof(RF_DeviceConfig_t));

			return (retcode);
		}
		break;
	case RAIDFRAME_CHECK_PARITY:
		*(int *) data = raidPtrs[unit]->parity_good;
		return (0);
	case RAIDFRAME_RESET_ACCTOTALS:
		{
			RF_Raid_t *raid = raidPtrs[unit];

			bzero(&raid->acc_totals, sizeof(raid->acc_totals));
			return (0);
		}
		break;

	case RAIDFRAME_GET_ACCTOTALS:
		{
			RF_AccTotals_t *totals = (RF_AccTotals_t *) data;
			RF_Raid_t *raid = raidPtrs[unit];

			*totals = raid->acc_totals;
			return (0);
		}
		break;

	case RAIDFRAME_KEEP_ACCTOTALS:
		{
			RF_Raid_t *raid = raidPtrs[unit];
			int    *keep = (int *) data;

			raid->keep_acc_totals = *keep;
			return (0);
		}
		break;

	case RAIDFRAME_GET_SIZE:
		*(int *) data = raidPtrs[unit]->totalSectors;
		return (0);

#define RAIDFRAME_RECON 1
		/* XXX The above should probably be set somewhere else!! GO */
#if RAIDFRAME_RECON > 0

		/* fail a disk & optionally start reconstruction */
	case RAIDFRAME_FAIL_DISK:
		rr = (struct rf_recon_req *) data;

		if (rr->row < 0 || rr->row >= raidPtrs[unit]->numRow
		    || rr->col < 0 || rr->col >= raidPtrs[unit]->numCol)
			return (EINVAL);

		printf("raid%d: Failing the disk: row: %d col: %d\n",
		       unit, rr->row, rr->col);

		/* make a copy of the recon request so that we don't rely on
		 * the user's buffer */
		RF_Malloc(rrcopy, sizeof(*rrcopy), (struct rf_recon_req *));
		bcopy(rr, rrcopy, sizeof(*rr));
		rrcopy->raidPtr = (void *) raidPtrs[unit];

		LOCK_RECON_Q_MUTEX();
		rrcopy->next = recon_queue;
		recon_queue = rrcopy;
		wakeup(&recon_queue);
		UNLOCK_RECON_Q_MUTEX();

		return (0);

		/* invoke a copyback operation after recon on whatever disk
		 * needs it, if any */
	case RAIDFRAME_COPYBACK:
		/* borrow the current thread to get this done */
		raidPtrs[unit]->proc = p;	/* ICK.. but needed :-p  GO */
		s = splbio();
		rf_CopybackReconstructedData(raidPtrs[unit]);
		splx(s);
		return (0);

		/* return the percentage completion of reconstruction */
	case RAIDFRAME_CHECKRECON:
		row = *(int *) data;
		if (row < 0 || row >= raidPtrs[unit]->numRow)
			return (EINVAL);
		if (raidPtrs[unit]->status[row] != rf_rs_reconstructing)
			*(int *) data = 100;
		else
			*(int *) data = raidPtrs[unit]->reconControl[row]->percentComplete;
		return (0);

		/* the sparetable daemon calls this to wait for the kernel to
		 * need a spare table. this ioctl does not return until a
		 * spare table is needed. XXX -- calling mpsleep here in the
		 * ioctl code is almost certainly wrong and evil. -- XXX XXX
		 * -- I should either compute the spare table in the kernel,
		 * or have a different -- XXX XXX -- interface (a different
		 * character device) for delivering the table          -- XXX */
#if 0
	case RAIDFRAME_SPARET_WAIT:
		RF_LOCK_MUTEX(rf_sparet_wait_mutex);
		while (!rf_sparet_wait_queue)
			mpsleep(&rf_sparet_wait_queue, (PZERO + 1) | PCATCH, "sparet wait", 0, (void *) simple_lock_addr(rf_sparet_wait_mutex), MS_LOCK_SIMPLE);
		waitreq = rf_sparet_wait_queue;
		rf_sparet_wait_queue = rf_sparet_wait_queue->next;
		RF_UNLOCK_MUTEX(rf_sparet_wait_mutex);

		*((RF_SparetWait_t *) data) = *waitreq;	/* structure assignment */

		RF_Free(waitreq, sizeof(*waitreq));
		return (0);


		/* wakes up a process waiting on SPARET_WAIT and puts an error
		 * code in it that will cause the dameon to exit */
	case RAIDFRAME_ABORT_SPARET_WAIT:
		RF_Malloc(waitreq, sizeof(*waitreq), (RF_SparetWait_t *));
		waitreq->fcol = -1;
		RF_LOCK_MUTEX(rf_sparet_wait_mutex);
		waitreq->next = rf_sparet_wait_queue;
		rf_sparet_wait_queue = waitreq;
		RF_UNLOCK_MUTEX(rf_sparet_wait_mutex);
		wakeup(&rf_sparet_wait_queue);
		return (0);

		/* used by the spare table daemon to deliver a spare table
		 * into the kernel */
	case RAIDFRAME_SEND_SPARET:

		/* install the spare table */
		retcode = rf_SetSpareTable(raidPtrs[unit], *(void **) data);

		/* respond to the requestor.  the return status of the spare
		 * table installation is passed in the "fcol" field */
		RF_Malloc(waitreq, sizeof(*waitreq), (RF_SparetWait_t *));
		waitreq->fcol = retcode;
		RF_LOCK_MUTEX(rf_sparet_wait_mutex);
		waitreq->next = rf_sparet_resp_queue;
		rf_sparet_resp_queue = waitreq;
		wakeup(&rf_sparet_resp_queue);
		RF_UNLOCK_MUTEX(rf_sparet_wait_mutex);

		return (retcode);
#endif


#endif				/* RAIDFRAME_RECON > 0 */

	default:
		break;		/* fall through to the os-specific code below */

	}

	if (!raidPtrs[unit]->valid)
		return (EINVAL);

	/*
	 * Add support for "regular" device ioctls here.
	 */

	switch (cmd) {
	case DIOCGDINFO:
		db1_printf(("DIOCGDINFO %d %d\n", (int) dev, (int) DISKPART(dev)));
		*(struct disklabel *) data = *(rs->sc_dkdev.dk_label);
		break;

	case DIOCGPART:
		db1_printf(("DIOCGPART: %d %d\n", (int) dev, (int) DISKPART(dev)));
		((struct partinfo *) data)->disklab = rs->sc_dkdev.dk_label;
		((struct partinfo *) data)->part =
		    &rs->sc_dkdev.dk_label->d_partitions[DISKPART(dev)];
		break;

	case DIOCWDINFO:
		db1_printf(("DIOCWDINFO\n"));
	case DIOCSDINFO:
		db1_printf(("DIOCSDINFO\n"));
		if ((error = raidlock(rs)) != 0)
			return (error);

		rs->sc_flags |= RAIDF_LABELLING;

		error = setdisklabel(rs->sc_dkdev.dk_label,
		    (struct disklabel *) data, 0, rs->sc_dkdev.dk_cpulabel);
		if (error == 0) {
			if (cmd == DIOCWDINFO)
				error = writedisklabel(RAIDLABELDEV(dev),
				    raidstrategy, rs->sc_dkdev.dk_label,
				    rs->sc_dkdev.dk_cpulabel);
		}
		rs->sc_flags &= ~RAIDF_LABELLING;

		raidunlock(rs);

		if (error)
			return (error);
		break;

	case DIOCWLABEL:
		db1_printf(("DIOCWLABEL\n"));
		if (*(int *) data != 0)
			rs->sc_flags |= RAIDF_WLABEL;
		else
			rs->sc_flags &= ~RAIDF_WLABEL;
		break;

	case DIOCGDEFLABEL:
		db1_printf(("DIOCGDEFLABEL\n"));
		raidgetdefaultlabel(raidPtrs[unit], rs,
		    (struct disklabel *) data);
		break;

	default:
		retcode = ENOTTY;	/* XXXX ?? OR EINVAL ? */
	}
	return (retcode);

}


/* raidinit -- complete the rest of the initialization for the
   RAIDframe device.  */


static int
raidinit(dev, raidPtr, unit)
	dev_t   dev;
	RF_Raid_t *raidPtr;
	int     unit;
{
	int     retcode;
	/* int ix; */
	/* struct raidbuf *raidbp; */
	struct raid_softc *rs;

	retcode = 0;

	rs = &raid_softc[unit];
	pool_init(&rs->sc_cbufpool, sizeof(struct raidbuf), 0,
		  0, 0, "raidpl", 0, NULL, NULL, M_RAIDFRAME);


	/* XXX should check return code first... */
	rs->sc_flags |= RAIDF_INITED;

	sprintf(rs->sc_xname, "raid%d", unit);	/* XXX doesn't check bounds. */

	rs->sc_dkdev.dk_name = rs->sc_xname;

	/* disk_attach actually creates space for the CPU disklabel, among
	 * other things, so it's critical to call this *BEFORE* we try putzing
	 * with disklabels. */

	disk_attach(&rs->sc_dkdev);

	/* XXX There may be a weird interaction here between this, and
	 * protectedSectors, as used in RAIDframe.  */

	rs->sc_size = raidPtr->totalSectors;
	rs->sc_dev = dev;

	return (retcode);
}

/*
 * This kernel thread never exits.  It is created once, and persists
 * until the system reboots.
 */

void 
rf_ReconKernelThread()
{
	struct rf_recon_req *req;
	int     s;

	/* XXX not sure what spl() level we should be at here... probably
	 * splbio() */
	s = splbio();

	while (1) {
		/* grab the next reconstruction request from the queue */
		LOCK_RECON_Q_MUTEX();
		while (!recon_queue) {
			UNLOCK_RECON_Q_MUTEX();
			tsleep(&recon_queue, PRIBIO,
			       "raidframe recon", 0);
			LOCK_RECON_Q_MUTEX();
		}
		req = recon_queue;
		recon_queue = recon_queue->next;
		UNLOCK_RECON_Q_MUTEX();

		/*
	         * If flags specifies that we should start recon, this call
	         * will not return until reconstruction completes, fails, 
		 * or is aborted.
	         */
		rf_FailDisk((RF_Raid_t *) req->raidPtr, req->row, req->col,
		    ((req->flags & RF_FDFLAGS_RECON) ? 1 : 0));

		RF_Free(req, sizeof(*req));
	}
}
/* wake up the daemon & tell it to get us a spare table
 * XXX
 * the entries in the queues should be tagged with the raidPtr
 * so that in the extremely rare case that two recons happen at once, 
 * we know for which device were requesting a spare table
 * XXX
 */
int 
rf_GetSpareTableFromDaemon(req)
	RF_SparetWait_t *req;
{
	int     retcode;

	RF_LOCK_MUTEX(rf_sparet_wait_mutex);
	req->next = rf_sparet_wait_queue;
	rf_sparet_wait_queue = req;
	wakeup(&rf_sparet_wait_queue);

	/* mpsleep unlocks the mutex */
	while (!rf_sparet_resp_queue) {
		tsleep(&rf_sparet_resp_queue, PRIBIO,
		    "raidframe getsparetable", 0);
#if 0
		mpsleep(&rf_sparet_resp_queue, PZERO, "sparet resp", 0, 
			(void *) simple_lock_addr(rf_sparet_wait_mutex), 
			MS_LOCK_SIMPLE);
#endif
	}
	req = rf_sparet_resp_queue;
	rf_sparet_resp_queue = req->next;
	RF_UNLOCK_MUTEX(rf_sparet_wait_mutex);

	retcode = req->fcol;
	RF_Free(req, sizeof(*req));	/* this is not the same req as we
					 * alloc'd */
	return (retcode);
}
/* a wrapper around rf_DoAccess that extracts appropriate info from the 
 * bp & passes it down.
 * any calls originating in the kernel must use non-blocking I/O
 * do some extra sanity checking to return "appropriate" error values for
 * certain conditions (to make some standard utilities work)
 */
int 
rf_DoAccessKernel(raidPtr, bp, flags, cbFunc, cbArg)
	RF_Raid_t *raidPtr;
	struct buf *bp;
	RF_RaidAccessFlags_t flags;
	void    (*cbFunc) (struct buf *);
	void   *cbArg;
{
	RF_SectorCount_t num_blocks, pb, sum;
	RF_RaidAddr_t raid_addr;
	int     retcode;
	struct partition *pp;
	daddr_t blocknum;
	int     unit;
	struct raid_softc *rs;
	int     do_async;

	/* XXX The dev_t used here should be for /dev/[r]raid* !!! */

	unit = raidPtr->raidid;
	rs = &raid_softc[unit];

	/* Ok, for the bp we have here, bp->b_blkno is relative to the
	 * partition.. Need to make it absolute to the underlying device.. */

	blocknum = bp->b_blkno;
	if (DISKPART(bp->b_dev) != RAW_PART) {
		pp = &rs->sc_dkdev.dk_label->d_partitions[DISKPART(bp->b_dev)];
		blocknum += pp->p_offset;
		db1_printf(("updated: %d %d\n", DISKPART(bp->b_dev),
			pp->p_offset));
	} else {
		db1_printf(("Is raw..\n"));
	}
	db1_printf(("Blocks: %d, %d\n", (int) bp->b_blkno, (int) blocknum));

	db1_printf(("bp->b_bcount = %d\n", (int) bp->b_bcount));
	db1_printf(("bp->b_resid = %d\n", (int) bp->b_resid));

	/* *THIS* is where we adjust what block we're going to... but DO NOT
	 * TOUCH bp->b_blkno!!! */
	raid_addr = blocknum;

	num_blocks = bp->b_bcount >> raidPtr->logBytesPerSector;
	pb = (bp->b_bcount & raidPtr->sectorMask) ? 1 : 0;
	sum = raid_addr + num_blocks + pb;
	if (1 || rf_debugKernelAccess) {
		db1_printf(("raid_addr=%d sum=%d num_blocks=%d(+%d) (%d)\n",
			(int) raid_addr, (int) sum, (int) num_blocks,
			(int) pb, (int) bp->b_resid));
	}
	if ((sum > raidPtr->totalSectors) || (sum < raid_addr)
	    || (sum < num_blocks) || (sum < pb)) {
		bp->b_error = ENOSPC;
		bp->b_flags |= B_ERROR;
		bp->b_resid = bp->b_bcount;
		biodone(bp);
		return (bp->b_error);
	}
	/*
	 * XXX rf_DoAccess() should do this, not just DoAccessKernel()
	 */

	if (bp->b_bcount & raidPtr->sectorMask) {
		bp->b_error = EINVAL;
		bp->b_flags |= B_ERROR;
		bp->b_resid = bp->b_bcount;
		biodone(bp);
		return (bp->b_error);
	}
	db1_printf(("Calling DoAccess..\n"));


	/* Put a throttle on the number of requests we handle simultanously */

	RF_LOCK_MUTEX(raidPtr->mutex);

	while(raidPtr->openings <= 0) {
		RF_UNLOCK_MUTEX(raidPtr->mutex);
		(void)tsleep(&raidPtr->openings, PRIBIO, "rfdwait", 0);
		RF_LOCK_MUTEX(raidPtr->mutex);
	}
	raidPtr->openings--;

	RF_UNLOCK_MUTEX(raidPtr->mutex);

	/*
	 * Everything is async.
	 */
	do_async = 1;

	/* don't ever condition on bp->b_flags & B_WRITE.  always condition on
	 * B_READ instead */
	retcode = rf_DoAccess(raidPtr, (bp->b_flags & B_READ) ?
	    RF_IO_TYPE_READ : RF_IO_TYPE_WRITE,
	    do_async, raid_addr, num_blocks,
	    bp->b_un.b_addr,
	    bp, NULL, NULL, RF_DAG_NONBLOCKING_IO | flags,
	    NULL, cbFunc, cbArg);
#if 0
	db1_printf(("After call to DoAccess: 0x%x 0x%x %d\n", bp,
		bp->b_data, (int) bp->b_resid));
#endif

	return (retcode);
}
/* invoke an I/O from kernel mode.  Disk queue should be locked upon entry */

int 
rf_DispatchKernelIO(queue, req)
	RF_DiskQueue_t *queue;
	RF_DiskQueueData_t *req;
{
	int     op = (req->type == RF_IO_TYPE_READ) ? B_READ : B_WRITE;
	struct buf *bp;
	struct raidbuf *raidbp = NULL;
	struct raid_softc *rs;
	int     unit;

	/* XXX along with the vnode, we also need the softc associated with
	 * this device.. */

	req->queue = queue;

	unit = queue->raidPtr->raidid;

	db1_printf(("DispatchKernelIO unit: %d\n", unit));

	if (unit >= numraid) {
		printf("Invalid unit number: %d %d\n", unit, numraid);
		panic("Invalid Unit number in rf_DispatchKernelIO\n");
	}
	rs = &raid_softc[unit];

	/* XXX is this the right place? */
	disk_busy(&rs->sc_dkdev);

	bp = req->bp;
#if 1
	/* XXX when there is a physical disk failure, someone is passing us a
	 * buffer that contains old stuff!!  Attempt to deal with this problem
	 * without taking a performance hit... (not sure where the real bug
	 * is.  It's buried in RAIDframe somewhere) :-(  GO ) */

	if (bp->b_flags & B_ERROR) {
		bp->b_flags &= ~B_ERROR;
	}
	if (bp->b_error != 0) {
		bp->b_error = 0;
	}
#endif
	raidbp = RAIDGETBUF(rs);

	raidbp->rf_flags = 0;	/* XXX not really used anywhere... */

	/*
	 * context for raidiodone
	 */
	raidbp->rf_obp = bp;
	raidbp->req = req;

	switch (req->type) {
	case RF_IO_TYPE_NOP:	/* used primarily to unlock a locked queue */
		/* Dprintf2("rf_DispatchKernelIO: NOP to r %d c %d\n",
		 * queue->row, queue->col); */
		/* XXX need to do something extra here.. */
		/* I'm leaving this in, as I've never actually seen it used,
		 * and I'd like folks to report it... GO */
		printf(("WAKEUP CALLED\n"));
		queue->numOutstanding++;

		/* XXX need to glue the original buffer into this??  */

		KernelWakeupFunc(&raidbp->rf_buf);
		break;

	case RF_IO_TYPE_READ:
	case RF_IO_TYPE_WRITE:

		if (req->tracerec) {
			RF_ETIMER_START(req->tracerec->timer);
		}
		InitBP(&raidbp->rf_buf, queue->rf_cinfo->ci_vp,
		    op | bp->b_flags, queue->rf_cinfo->ci_dev,
		    req->sectorOffset, req->numSector,
		    req->buf, KernelWakeupFunc, (void *) req,
		    queue->raidPtr->logBytesPerSector, req->b_proc);

		if (rf_debugKernelAccess) {
			db1_printf(("dispatch: bp->b_blkno = %ld\n",
				(long) bp->b_blkno));
		}
		queue->numOutstanding++;
		queue->last_deq_sector = req->sectorOffset;
		/* acc wouldn't have been let in if there were any pending
		 * reqs at any other priority */
		queue->curPriority = req->priority;
		/* Dprintf3("rf_DispatchKernelIO: %c to row %d col %d\n",
		 * req->type, queue->row, queue->col); */

		db1_printf(("Going for %c to unit %d row %d col %d\n",
			req->type, unit, queue->row, queue->col));
		db1_printf(("sector %d count %d (%d bytes) %d\n",
			(int) req->sectorOffset, (int) req->numSector,
			(int) (req->numSector <<
			    queue->raidPtr->logBytesPerSector),
			(int) queue->raidPtr->logBytesPerSector));
		if ((raidbp->rf_buf.b_flags & B_READ) == 0) {
			raidbp->rf_buf.b_vp->v_numoutput++;
		}
		VOP_STRATEGY(&raidbp->rf_buf);

		break;

	default:
		panic("bad req->type in rf_DispatchKernelIO");
	}
	db1_printf(("Exiting from DispatchKernelIO\n"));
	return (0);
}
/* this is the callback function associated with a I/O invoked from
   kernel code.
 */
static void 
KernelWakeupFunc(vbp)
	struct buf *vbp;
{
	RF_DiskQueueData_t *req = NULL;
	RF_DiskQueue_t *queue;
	struct raidbuf *raidbp = (struct raidbuf *) vbp;
	struct buf *bp;
	struct raid_softc *rs;
	int     unit;
	register int s;

	s = splbio();		/* XXX */
	db1_printf(("recovering the request queue:\n"));
	req = raidbp->req;

	bp = raidbp->rf_obp;
#if 0
	db1_printf(("bp=0x%x\n", bp));
#endif

	queue = (RF_DiskQueue_t *) req->queue;

	if (raidbp->rf_buf.b_flags & B_ERROR) {
#if 0
		printf("Setting bp->b_flags!!! %d\n", raidbp->rf_buf.b_error);
#endif
		bp->b_flags |= B_ERROR;
		bp->b_error = raidbp->rf_buf.b_error ?
		    raidbp->rf_buf.b_error : EIO;
	}
#if 0
	db1_printf(("raidbp->rf_buf.b_bcount=%d\n", (int) raidbp->rf_buf.b_bcount));
	db1_printf(("raidbp->rf_buf.b_bufsize=%d\n", (int) raidbp->rf_buf.b_bufsize));
	db1_printf(("raidbp->rf_buf.b_resid=%d\n", (int) raidbp->rf_buf.b_resid));
	db1_printf(("raidbp->rf_buf.b_data=0x%x\n", raidbp->rf_buf.b_data));
#endif

	/* XXX methinks this could be wrong... */
#if 1
	bp->b_resid = raidbp->rf_buf.b_resid;
#endif

	if (req->tracerec) {
		RF_ETIMER_STOP(req->tracerec->timer);
		RF_ETIMER_EVAL(req->tracerec->timer);
		RF_LOCK_MUTEX(rf_tracing_mutex);
		req->tracerec->diskwait_us += RF_ETIMER_VAL_US(req->tracerec->timer);
		req->tracerec->phys_io_us += RF_ETIMER_VAL_US(req->tracerec->timer);
		req->tracerec->num_phys_ios++;
		RF_UNLOCK_MUTEX(rf_tracing_mutex);
	}
	bp->b_bcount = raidbp->rf_buf.b_bcount;	/* XXXX ?? */

	unit = queue->raidPtr->raidid;	/* *Much* simpler :-> */


	/* XXX Ok, let's get aggressive... If B_ERROR is set, let's go
	 * ballistic, and mark the component as hosed... */
#if 1
	if (bp->b_flags & B_ERROR) {
		/* Mark the disk as dead */
		/* but only mark it once... */
		if (queue->raidPtr->Disks[queue->row][queue->col].status ==
		    rf_ds_optimal) {
			printf("raid%d: IO Error.  Marking %s as failed.\n",
			    unit, queue->raidPtr->Disks[queue->row][queue->col].devname);
			queue->raidPtr->Disks[queue->row][queue->col].status =
			    rf_ds_failed;
			queue->raidPtr->status[queue->row] = rf_rs_degraded;
			queue->raidPtr->numFailures++;
			/* XXX here we should bump the version number for each component, and write that data out */
		} else {	/* Disk is already dead... */
			/* printf("Disk already marked as dead!\n"); */
		}

	}
#endif

	rs = &raid_softc[unit];
	RAIDPUTBUF(rs, raidbp);


	if (bp->b_resid == 0) {
		db1_printf(("Disk is no longer busy for this buffer... %d %ld %ld\n",
			unit, bp->b_resid, bp->b_bcount));
		/* XXX is this the right place for a disk_unbusy()??!??!?!? */
		disk_unbusy(&rs->sc_dkdev, (bp->b_bcount - bp->b_resid));
	} else {
		db1_printf(("b_resid is still %ld\n", bp->b_resid));
	}

	rf_DiskIOComplete(queue, req, (bp->b_flags & B_ERROR) ? 1 : 0);
	(req->CompleteFunc) (req->argument, (bp->b_flags & B_ERROR) ? 1 : 0);
	/* printf("Exiting KernelWakeupFunc\n"); */

	splx(s);		/* XXX */
}



/*
 * initialize a buf structure for doing an I/O in the kernel.
 */
static void 
InitBP(
    struct buf * bp,
    struct vnode * b_vp,
    unsigned rw_flag,
    dev_t dev,
    RF_SectorNum_t startSect,
    RF_SectorCount_t numSect,
    caddr_t buf,
    void (*cbFunc) (struct buf *),
    void *cbArg,
    int logBytesPerSector,
    struct proc * b_proc)
{
	/* bp->b_flags       = B_PHYS | rw_flag; */
	bp->b_flags = B_CALL | rw_flag;	/* XXX need B_PHYS here too??? */
	bp->b_bcount = numSect << logBytesPerSector;
	bp->b_bufsize = bp->b_bcount;
	bp->b_error = 0;
	bp->b_dev = dev;
	db1_printf(("bp->b_dev is %d\n", dev));
	bp->b_un.b_addr = buf;
#if 0
	db1_printf(("bp->b_data=0x%x\n", bp->b_data));
#endif

	bp->b_blkno = startSect;
	bp->b_resid = bp->b_bcount;	/* XXX is this right!??!?!! */
	db1_printf(("b_bcount is: %d\n", (int) bp->b_bcount));
	if (bp->b_bcount == 0) {
		panic("bp->b_bcount is zero in InitBP!!\n");
	}
	bp->b_proc = b_proc;
	bp->b_iodone = cbFunc;
	bp->b_vp = b_vp;

}
/* Extras... */

unsigned int 
rpcc()
{
	/* XXX no clue what this is supposed to do.. my guess is that it's
	 * supposed to read the CPU cycle counter... */
	/* db1_printf("this is supposed to do something useful too!??\n"); */
	return (0);
}
#if 0
int 
rf_GetSpareTableFromDaemon(req)
	RF_SparetWait_t *req;
{
	int     retcode = 1;
	printf("This is supposed to do something useful!!\n");	/* XXX */

	return (retcode);

}
#endif

static void
raidgetdefaultlabel(raidPtr, rs, lp)
	RF_Raid_t *raidPtr;
	struct raid_softc *rs;
	struct disklabel *lp;
{
	db1_printf(("Building a default label...\n"));
	bzero(lp, sizeof(*lp));

	/* fabricate a label... */
	lp->d_secperunit = raidPtr->totalSectors;
	lp->d_secsize = raidPtr->bytesPerSector;
	lp->d_nsectors = 1024 * (1024 / raidPtr->bytesPerSector);
	lp->d_ntracks = 1;
	lp->d_ncylinders = raidPtr->totalSectors / lp->d_nsectors;
	lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors;

	strncpy(lp->d_typename, "raid", sizeof(lp->d_typename));
	lp->d_type = DTYPE_RAID;
	strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname));
	lp->d_rpm = 3600;
	lp->d_interleave = 1;
	lp->d_flags = 0;

	lp->d_partitions[RAW_PART].p_offset = 0;
	lp->d_partitions[RAW_PART].p_size = raidPtr->totalSectors;
	lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED;
	lp->d_npartitions = RAW_PART + 1;

	lp->d_magic = DISKMAGIC;
	lp->d_magic2 = DISKMAGIC;
	lp->d_checksum = dkcksum(rs->sc_dkdev.dk_label);

}
/*
 * Read the disklabel from the raid device.  If one is not present, fake one
 * up.
 */
static void
raidgetdisklabel(dev)
	dev_t   dev;
{
	int     unit = raidunit(dev);
	struct raid_softc *rs = &raid_softc[unit];
	char   *errstring;
	struct disklabel *lp = rs->sc_dkdev.dk_label;
	struct cpu_disklabel *clp = rs->sc_dkdev.dk_cpulabel;
	RF_Raid_t *raidPtr;

	db1_printf(("Getting the disklabel...\n"));

	bzero(clp, sizeof(*clp));

	raidPtr = raidPtrs[unit];

	raidgetdefaultlabel(raidPtr, rs, lp);

	/*
	 * Call the generic disklabel extraction routine.
	 */
	errstring = readdisklabel(RAIDLABELDEV(dev), raidstrategy,
	    rs->sc_dkdev.dk_label, rs->sc_dkdev.dk_cpulabel);
	if (errstring)
		raidmakedisklabel(rs);
	else {
		int     i;
		struct partition *pp;

		/*
		 * Sanity check whether the found disklabel is valid.
		 *
		 * This is necessary since total size of the raid device
		 * may vary when an interleave is changed even though exactly
		 * same componets are used, and old disklabel may used
		 * if that is found.
		 */
		if (lp->d_secperunit != rs->sc_size)
			printf("WARNING: %s: "
			    "total sector size in disklabel (%d) != "
			    "the size of raid (%ld)\n", rs->sc_xname,
			    lp->d_secperunit, (long) rs->sc_size);
		for (i = 0; i < lp->d_npartitions; i++) {
			pp = &lp->d_partitions[i];
			if (pp->p_offset + pp->p_size > rs->sc_size)
				printf("WARNING: %s: end of partition `%c' "
				    "exceeds the size of raid (%ld)\n",
				    rs->sc_xname, 'a' + i, (long) rs->sc_size);
		}
	}

}
/*
 * Take care of things one might want to take care of in the event
 * that a disklabel isn't present.
 */
static void
raidmakedisklabel(rs)
	struct raid_softc *rs;
{
	struct disklabel *lp = rs->sc_dkdev.dk_label;
	db1_printf(("Making a label..\n"));

	/*
	 * For historical reasons, if there's no disklabel present
	 * the raw partition must be marked FS_BSDFFS.
	 */

	lp->d_partitions[RAW_PART].p_fstype = FS_BSDFFS;

	strncpy(lp->d_packname, "default label", sizeof(lp->d_packname));

	lp->d_checksum = dkcksum(lp);
}
/*
 * Lookup the provided name in the filesystem.  If the file exists,
 * is a valid block device, and isn't being used by anyone else,
 * set *vpp to the file's vnode.
 * You'll find the original of this in ccd.c
 */
int
raidlookup(path, p, vpp)
	char   *path;
	struct proc *p;
	struct vnode **vpp;	/* result */
{
	struct nameidata nd;
	struct vnode *vp;
	struct vattr va;
	int     error;

	NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, path, p);
	if ((error = vn_open(&nd, FREAD | FWRITE, 0)) != 0) {
#ifdef DEBUG
		printf("RAIDframe: vn_open returned %d\n", error);
#endif
		return (error);
	}
	vp = nd.ni_vp;
	if (vp->v_usecount > 1) {
		VOP_UNLOCK(vp, 0);
		(void) vn_close(vp, FREAD | FWRITE, p->p_ucred, p);
		return (EBUSY);
	}
	if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) != 0) {
		VOP_UNLOCK(vp, 0);
		(void) vn_close(vp, FREAD | FWRITE, p->p_ucred, p);
		return (error);
	}
	/* XXX: eventually we should handle VREG, too. */
	if (va.va_type != VBLK) {
		VOP_UNLOCK(vp, 0);
		(void) vn_close(vp, FREAD | FWRITE, p->p_ucred, p);
		return (ENOTBLK);
	}
	VOP_UNLOCK(vp, 0);
	*vpp = vp;
	return (0);
}
/*
 * Wait interruptibly for an exclusive lock.
 *
 * XXX
 * Several drivers do this; it should be abstracted and made MP-safe.
 * (Hmm... where have we seen this warning before :->  GO )
 */
static int
raidlock(rs)
	struct raid_softc *rs;
{
	int     error;

	while ((rs->sc_flags & RAIDF_LOCKED) != 0) {
		rs->sc_flags |= RAIDF_WANTED;
		if ((error =
			tsleep(rs, PRIBIO | PCATCH, "raidlck", 0)) != 0)
			return (error);
	}
	rs->sc_flags |= RAIDF_LOCKED;
	return (0);
}
/*
 * Unlock and wake up any waiters.
 */
static void
raidunlock(rs)
	struct raid_softc *rs;
{

	rs->sc_flags &= ~RAIDF_LOCKED;
	if ((rs->sc_flags & RAIDF_WANTED) != 0) {
		rs->sc_flags &= ~RAIDF_WANTED;
		wakeup(rs);
	}
}
 

#define RF_COMPONENT_INFO_OFFSET  16384 /* bytes */
#define RF_COMPONENT_INFO_SIZE     1024 /* bytes */

int 
raidmarkclean(dev_t dev, struct vnode *b_vp, int mod_counter)
{
	RF_ComponentLabel_t component_label;
	raidread_component_label(dev, b_vp, &component_label);
	component_label.mod_counter = mod_counter;
	component_label.clean = RF_RAID_CLEAN;
	raidwrite_component_label(dev, b_vp, &component_label);
	return(0);
}


int 
raidmarkdirty(dev_t dev, struct vnode *b_vp, int mod_counter)
{
	RF_ComponentLabel_t component_label;
	raidread_component_label(dev, b_vp, &component_label);
	component_label.mod_counter = mod_counter;
	component_label.clean = RF_RAID_DIRTY;
	raidwrite_component_label(dev, b_vp, &component_label);
	return(0);
}

/* ARGSUSED */
int
raidread_component_label(dev, b_vp, component_label)
	dev_t dev;
	struct vnode *b_vp;
	RF_ComponentLabel_t *component_label;
{
	struct buf *bp;
	int error;
	
	/* XXX should probably ensure that we don't try to do this if
	   someone has changed rf_protected_sectors. */ 

	/* get a block of the appropriate size... */
	bp = geteblk((int)RF_COMPONENT_INFO_SIZE);
	bp->b_dev = dev;

	/* get our ducks in a row for the read */
	bp->b_blkno = RF_COMPONENT_INFO_OFFSET / DEV_BSIZE;
	bp->b_bcount = RF_COMPONENT_INFO_SIZE;
	bp->b_flags = B_BUSY | B_READ;
 	bp->b_resid = RF_COMPONENT_INFO_SIZE / DEV_BSIZE;

	(*bdevsw[major(bp->b_dev)].d_strategy)(bp);

	error = biowait(bp); 

	if (!error) {
		memcpy(component_label, bp->b_un.b_addr,
		       sizeof(RF_ComponentLabel_t));
#if 0
		printf("raidread_component_label: got component label:\n");
		printf("Version: %d\n",component_label->version);
		printf("Serial Number: %d\n",component_label->serial_number);
		printf("Mod counter: %d\n",component_label->mod_counter);
		printf("Row: %d\n", component_label->row);
		printf("Column: %d\n", component_label->column);
		printf("Num Rows: %d\n", component_label->num_rows);
		printf("Num Columns: %d\n", component_label->num_columns);
		printf("Clean: %d\n", component_label->clean);
		printf("Status: %d\n", component_label->status);
#endif
        } else {
		printf("Failed to read RAID component label!\n");
	}

        bp->b_flags = B_INVAL | B_AGE;
	brelse(bp); 
	return(error);
}
/* ARGSUSED */
int 
raidwrite_component_label(dev, b_vp, component_label)
	dev_t dev; 
	struct vnode *b_vp;
	RF_ComponentLabel_t *component_label;
{
	struct buf *bp;
	int error;

	/* get a block of the appropriate size... */
	bp = geteblk((int)RF_COMPONENT_INFO_SIZE);
	bp->b_dev = dev;

	/* get our ducks in a row for the write */
	bp->b_blkno = RF_COMPONENT_INFO_OFFSET / DEV_BSIZE;
	bp->b_bcount = RF_COMPONENT_INFO_SIZE;
	bp->b_flags = B_BUSY | B_WRITE;
 	bp->b_resid = RF_COMPONENT_INFO_SIZE / DEV_BSIZE;

	memset( bp->b_un.b_addr, 0, RF_COMPONENT_INFO_SIZE );

	memcpy( bp->b_un.b_addr, component_label, sizeof(RF_ComponentLabel_t));

	(*bdevsw[major(bp->b_dev)].d_strategy)(bp);
	error = biowait(bp); 
        bp->b_flags = B_INVAL | B_AGE;
	brelse(bp);
	if (error) {
		printf("Failed to write RAID component info!\n");
	}

	return(error);
}

void 
rf_markalldirty( raidPtr )
	RF_Raid_t *raidPtr;
{
	RF_ComponentLabel_t c_label;
	int r,c;

	raidPtr->mod_counter++;
	for (r = 0; r < raidPtr->numRow; r++) {
		for (c = 0; c < raidPtr->numCol; c++) {
			if (raidPtr->Disks[r][c].status != rf_ds_failed) {
				raidread_component_label(
					raidPtr->Disks[r][c].dev,
					raidPtr->raid_cinfo[r][c].ci_vp,
					&c_label);
				if (c_label.status == rf_ds_spared) {
					/* XXX do something special... 
					 but whatever you do, don't 
					 try to access it!! */
				} else {
#if 0
				c_label.status = 
					raidPtr->Disks[r][c].status;
				raidwrite_component_label( 
					raidPtr->Disks[r][c].dev,
					raidPtr->raid_cinfo[r][c].ci_vp,
					&c_label);
#endif
				raidmarkdirty( 
				       raidPtr->Disks[r][c].dev, 
				       raidPtr->raid_cinfo[r][c].ci_vp,
				       raidPtr->mod_counter);
				}
			}
		} 
	}
	/* printf("Component labels marked dirty.\n"); */
#if 0
	for( c = 0; c < raidPtr->numSpare ; c++) {
		sparecol = raidPtr->numCol + c;
		if (raidPtr->Disks[r][sparecol].status == rf_ds_used_spare) {
			/* 

			   XXX this is where we get fancy and map this spare
			   into it's correct spot in the array.

			 */
			/* 
			   
			   we claim this disk is "optimal" if it's 
			   rf_ds_used_spare, as that means it should be 
			   directly substitutable for the disk it replaced. 
			   We note that too...

			 */

			for(i=0;i<raidPtr->numRow;i++) {
				for(j=0;j<raidPtr->numCol;j++) {
					if ((raidPtr->Disks[i][j].spareRow == 
					     r) &&
					    (raidPtr->Disks[i][j].spareCol ==
					     sparecol)) {
						srow = r;
						scol = sparecol;
						break;
					}
				}
			}
			
			raidread_component_label( 
				      raidPtr->Disks[r][sparecol].dev,
				      raidPtr->raid_cinfo[r][sparecol].ci_vp,
				      &c_label);
			/* make sure status is noted */
			c_label.version = RF_COMPONENT_LABEL_VERSION; 
			c_label.mod_counter = raidPtr->mod_counter;
			c_label.serial_number = raidPtr->serial_number;
			c_label.row = srow;
			c_label.column = scol;
			c_label.num_rows = raidPtr->numRow;
			c_label.num_columns = raidPtr->numCol;
			c_label.clean = RF_RAID_DIRTY; /* changed in a bit*/
			c_label.status = rf_ds_optimal;
			raidwrite_component_label(
				      raidPtr->Disks[r][sparecol].dev,
				      raidPtr->raid_cinfo[r][sparecol].ci_vp,
				      &c_label);
			raidmarkclean( raidPtr->Disks[r][sparecol].dev, 
			              raidPtr->raid_cinfo[r][sparecol].ci_vp);
		}
	}

#endif
}


void
rf_update_component_labels( raidPtr )
	RF_Raid_t *raidPtr;
{
	RF_ComponentLabel_t c_label;
	int sparecol;
	int r,c;
	int i,j;
	int srow, scol;

	srow = -1;
	scol = -1;

	/* XXX should do extra checks to make sure things really are clean, 
	   rather than blindly setting the clean bit... */

	raidPtr->mod_counter++;

	for (r = 0; r < raidPtr->numRow; r++) {
		for (c = 0; c < raidPtr->numCol; c++) {
			if (raidPtr->Disks[r][c].status == rf_ds_optimal) {
				raidread_component_label(
					raidPtr->Disks[r][c].dev,
					raidPtr->raid_cinfo[r][c].ci_vp,
					&c_label);
				/* make sure status is noted */
				c_label.status = rf_ds_optimal;
				raidwrite_component_label( 
					raidPtr->Disks[r][c].dev,
					raidPtr->raid_cinfo[r][c].ci_vp,
					&c_label);
				if (raidPtr->parity_good == RF_RAID_CLEAN) {
					raidmarkclean( 
					      raidPtr->Disks[r][c].dev, 
					      raidPtr->raid_cinfo[r][c].ci_vp,
					      raidPtr->mod_counter);
				}
			} 
			/* else we don't touch it.. */
#if 0
			else if (raidPtr->Disks[r][c].status !=
				   rf_ds_failed) {
				raidread_component_label(
					raidPtr->Disks[r][c].dev,
					raidPtr->raid_cinfo[r][c].ci_vp,
					&c_label);
				/* make sure status is noted */
				c_label.status = 
					raidPtr->Disks[r][c].status;
				raidwrite_component_label( 
					raidPtr->Disks[r][c].dev,
					raidPtr->raid_cinfo[r][c].ci_vp,
					&c_label);
				if (raidPtr->parity_good == RF_RAID_CLEAN) {
					raidmarkclean( 
					      raidPtr->Disks[r][c].dev, 
					      raidPtr->raid_cinfo[r][c].ci_vp,
					      raidPtr->mod_counter);
				}
			}
#endif
		} 
	}

	for( c = 0; c < raidPtr->numSpare ; c++) {
		sparecol = raidPtr->numCol + c;
		if (raidPtr->Disks[0][sparecol].status == rf_ds_used_spare) {
			/* 
			   
			   we claim this disk is "optimal" if it's 
			   rf_ds_used_spare, as that means it should be 
			   directly substitutable for the disk it replaced. 
			   We note that too...

			 */

			for(i=0;i<raidPtr->numRow;i++) {
				for(j=0;j<raidPtr->numCol;j++) {
					if ((raidPtr->Disks[i][j].spareRow == 
					     0) &&
					    (raidPtr->Disks[i][j].spareCol ==
					     sparecol)) {
						srow = i;
						scol = j;
						break;
					}
				}
			}
			
			raidread_component_label( 
				      raidPtr->Disks[0][sparecol].dev,
				      raidPtr->raid_cinfo[0][sparecol].ci_vp,
				      &c_label);
			/* make sure status is noted */
			c_label.version = RF_COMPONENT_LABEL_VERSION; 
			c_label.mod_counter = raidPtr->mod_counter;
			c_label.serial_number = raidPtr->serial_number;
			c_label.row = srow;
			c_label.column = scol;
			c_label.num_rows = raidPtr->numRow;
			c_label.num_columns = raidPtr->numCol;
			c_label.clean = RF_RAID_DIRTY; /* changed in a bit*/
			c_label.status = rf_ds_optimal;
			raidwrite_component_label(
				      raidPtr->Disks[0][sparecol].dev,
				      raidPtr->raid_cinfo[0][sparecol].ci_vp,
				      &c_label);
			if (raidPtr->parity_good == RF_RAID_CLEAN) {
				raidmarkclean( raidPtr->Disks[0][sparecol].dev,
			              raidPtr->raid_cinfo[0][sparecol].ci_vp,
					       raidPtr->mod_counter);
			}
		}
	}
	/* 	printf("Component labels updated\n"); */
}