2 files changed, 1543 insertions, 0 deletions

diff --git a/share/man/man4/ccd.4 b/share/man/man4/ccd.4
new file mode 100644
index 000000000000..a292bf98360f
--- /dev/null
+++ b/share/man/man4/ccd.4
@@ -0,0 +1,115 @@
+.\"	$NetBSD: ccd.4,v 1.5 1995/10/09 06:09:09 thorpej Exp $
+.\"
+.\" Copyright (c) 1994 Jason Downs.
+.\" Copyright (c) 1994, 1995 Jason R. Thorpe.
+.\" All rights reserved.
+.\"
+.\" 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 for the NetBSD Project
+.\"	by Jason Downs and Jason R. Thorpe.
+.\" 4. Neither the name of the author 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 AUTHOR ``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 AUTHOR 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.
+.\"
+.Dd August 9, 1995
+.Dt CCD 4
+.Os NetBSD
+.Sh NAME
+.Nm ccd
+.Nd Concatenated Disk Driver
+.Sh SYNOPSIS
+.Cd "pseudo-device ccd 4"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides the capability of combining one or more disks/partitions
+into one virtual disk.
+.Pp
+This document assumes that you're familiar with how to generate kernels,
+how to properly configure disks and pseudo-devices in a kernel
+configuration file, and how to partition disks.
+.Pp
+Note that the
+.Sq raw
+partitions of the disks
+.Pa should not
+be combined.  Each component partition should be offset at least one
+cylinder from the beginning of the component disk.  This avoids potential
+conflicts between the compoent disk's disklabel and the
+.Nm ccd's
+disklabel.  The kernel will only allow component partitions of type FS_BSDFFS.
+.Pp
+In order to compile in support for the ccd, you must add a line similar
+to the following to your kernel configuration file:
+.Bd -unfilled -offset indent
+pseudo-device	ccd	4	# concatenated disk devices
+.Ed
+.Pp
+The count argument is how many
+.Nm ccds
+memory is allocated for a boot time.  In this example, no more than 4
+.Nm ccds
+may be configured.
+.Pp
+A
+.Nm ccd
+may be either serially concatenated or interleaved.  If a
+.Nm ccd
+is interleaved correctly, a
+.Dq striping
+effect is achieved, which can increase performance.  The optimum interleave
+factor is typically the size of a track.  Since the interleave factor
+is expressed in units of DEV_BSIZE, one must account for sector sizes
+other than DEV_BSIZE in order to calculate the correct interleave.
+The kernel will not allow an interleave factor less than the size
+of the largest component sector divided by DEV_BSIZE.
+.Pp
+Note that best performance is achieved if all compent disks have the same
+geometery and size.  Optimum striping cannot occur with different
+disk types.
+.Pp
+There is a run-time utility that is used for configuring
+.Nm ccds .
+See
+.Xr ccdconfig 8
+for more information.
+.Sh WARNINGS
+If just one (or more) of the disks in a
+.Nm ccd
+fails, the entire
+file system will be lost.
+.Sh FILES
+/dev/{,r}ccd* - ccd device special files.
+.Pp
+.Sh HISTORY
+The concatenated disk driver was originally written at the University of
+Utah.
+.Sh SEE ALSO
+.Xr MAKEDEV 8 ,
+.Xr ccdconfig 8 ,
+.Xr config 8 ,
+.Xr config.old 8 ,
+.Xr fsck 8 ,
+.Xr mount 8 ,
+.Xr newfs 8 .
diff --git a/sys/dev/ccd/ccd.c b/sys/dev/ccd/ccd.c
new file mode 100644
index 000000000000..c8d33a4b867e
--- /dev/null
+++ b/sys/dev/ccd/ccd.c
@@ -0,0 +1,1428 @@
+/*	$NetBSD: ccd.c,v 1.22 1995/12/08 19:13:26 thorpej Exp $	*/
+
+/*
+ * Copyright (c) 1995 Jason R. Thorpe.
+ * All rights reserved.
+ *
+ * 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 for the NetBSD Project
+ *	by Jason R. Thorpe.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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
+ */
+
+/*
+ * "Concatenated" disk driver.
+ *
+ * Dynamic configuration and disklabel support by:
+ *	Jason R. Thorpe <thorpej@nas.nasa.gov>
+ *	Numerical Aerodynamic Simulation Facility
+ *	Mail Stop 258-6
+ *	NASA Ames Research Center
+ *	Moffett Field, CA 94035
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/errno.h>
+#include <sys/dkstat.h>
+#include <sys/buf.h>
+#include <sys/malloc.h>
+#include <sys/namei.h>
+#include <sys/conf.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/disklabel.h>
+#include <sys/device.h>
+#include <sys/disk.h>
+#include <sys/syslog.h>
+#include <sys/fcntl.h>
+#include <sys/vnode.h>
+
+#include <dev/ccdvar.h>
+
+#if defined(CCDDEBUG) && !defined(DEBUG)
+#define DEBUG
+#endif
+
+#ifdef DEBUG
+int ccddebug = 0x00;
+#define CCDB_FOLLOW	0x01
+#define CCDB_INIT	0x02
+#define CCDB_IO		0x04
+#define CCDB_LABEL	0x08
+#define CCDB_VNODE	0x10
+#endif
+
+#define	ccdunit(x)	DISKUNIT(x)
+
+struct ccdbuf {
+	struct buf	cb_buf;		/* new I/O buf */
+	struct buf	*cb_obp;	/* ptr. to original I/O buf */
+	int		cb_unit;	/* target unit */
+	int		cb_comp;	/* target component */
+};
+
+#define	getccdbuf()		\
+	((struct ccdbuf *)malloc(sizeof(struct ccdbuf), M_DEVBUF, M_WAITOK))
+#define putccdbuf(cbp)		\
+	free((caddr_t)(cbp), M_DEVBUF)
+
+#define CCDLABELDEV(dev)	\
+	(MAKEDISKDEV(major((dev)), ccdunit((dev)), RAW_PART))
+
+/* {b,c}devsw[] function prototypes */
+dev_type_open(ccdopen);
+dev_type_close(ccdclose);
+dev_type_strategy(ccdstrategy);
+dev_type_ioctl(ccdioctl);
+dev_type_read(ccdread);
+dev_type_write(ccdwrite);
+
+/* called by main() at boot time */
+void	ccdattach __P((int));
+
+/* called by biodone() at interrupt time */
+void	ccdiodone __P((struct ccdbuf *cbp));
+
+static	void ccdstart __P((struct ccd_softc *, struct buf *));
+static	void ccdinterleave __P((struct ccd_softc *, int));
+static	void ccdintr __P((struct ccd_softc *, struct buf *));
+static	int ccdinit __P((struct ccddevice *, char **, struct proc *));
+static	int ccdlookup __P((char *, struct proc *p, struct vnode **));
+static	struct ccdbuf *ccdbuffer __P((struct ccd_softc *, struct buf *,
+		daddr_t, caddr_t, long));
+static	void ccdgetdisklabel __P((dev_t));
+static	void ccdmakedisklabel __P((struct ccd_softc *));
+static	int ccdlock __P((struct ccd_softc *));
+static	void ccdunlock __P((struct ccd_softc *));
+
+#ifdef DEBUG
+static	void printiinfo __P((struct ccdiinfo *));
+#endif
+
+/* Non-private for the benefit of libkvm. */
+struct	ccd_softc *ccd_softc;
+struct	ccddevice *ccddevs;
+int	numccd = 0;
+
+/*
+ * Called by main() during pseudo-device attachment.  All we need
+ * to do is allocate enough space for devices to be configured later.
+ */
+void
+ccdattach(num)
+	int num;
+{
+	int i;
+
+	if (num <= 0) {
+#ifdef DIAGNOSTIC
+		panic("ccdattach: count <= 0");
+#endif
+		return;
+	}
+
+	ccd_softc = (struct ccd_softc *)malloc(num * sizeof(struct ccd_softc),
+	    M_DEVBUF, M_NOWAIT);
+	ccddevs = (struct ccddevice *)malloc(num * sizeof(struct ccddevice),
+	    M_DEVBUF, M_NOWAIT);
+	if ((ccd_softc == NULL) || (ccddevs == NULL)) {
+		printf("WARNING: no memory for concatenated disks\n");
+		if (ccd_softc != NULL)
+			free(ccd_softc, M_DEVBUF);
+		if (ccddevs != NULL)
+			free(ccddevs, M_DEVBUF);
+		return;
+	}
+	numccd = num;
+	bzero(ccd_softc, num * sizeof(struct ccd_softc));
+	bzero(ccddevs, num * sizeof(struct ccddevice));
+
+	/* XXX: is this necessary? */
+	for (i = 0; i < numccd; ++i)
+		ccddevs[i].ccd_dk = -1;
+}
+
+static int
+ccdinit(ccd, cpaths, p)
+	struct ccddevice *ccd;
+	char **cpaths;
+	struct proc *p;
+{
+	register struct ccd_softc *cs = &ccd_softc[ccd->ccd_unit];
+	register struct ccdcinfo *ci;
+	register size_t size;
+	register int ix;
+	struct vnode *vp;
+	struct vattr va;
+	size_t minsize;
+	int maxsecsize;
+	struct partinfo dpart;
+	struct ccdgeom *ccg = &cs->sc_geom;
+	char tmppath[MAXPATHLEN];
+	int error;
+
+#ifdef DEBUG
+	if (ccddebug & (CCDB_FOLLOW|CCDB_INIT))
+		printf("ccdinit: unit %d\n", ccd->ccd_unit);
+#endif
+
+#ifdef WORKING_DISK_STATISTICS		/* XXX !! */
+	cs->sc_dk = ccd->ccd_dk;
+#endif
+	cs->sc_size = 0;
+	cs->sc_ileave = ccd->ccd_interleave;
+	cs->sc_nccdisks = ccd->ccd_ndev;
+
+	/* Allocate space for the component info. */
+	cs->sc_cinfo = malloc(cs->sc_nccdisks * sizeof(struct ccdcinfo),
+	    M_DEVBUF, M_WAITOK);
+
+	/*
+	 * Verify that each component piece exists and record
+	 * relevant information about it.
+	 */
+	maxsecsize = 0;
+	minsize = 0;
+	for (ix = 0; ix < cs->sc_nccdisks; ix++) {
+		vp = ccd->ccd_vpp[ix];
+		ci = &cs->sc_cinfo[ix];
+		ci->ci_vp = vp;
+
+		/*
+		 * Copy in the pathname of the component.
+		 */
+		bzero(tmppath, sizeof(tmppath));	/* sanity */
+		if (error = copyinstr(cpaths[ix], tmppath,
+		    MAXPATHLEN, &ci->ci_pathlen)) {
+#ifdef DEBUG
+			if (ccddebug & (CCDB_FOLLOW|CCDB_INIT))
+				printf("ccd%d: can't copy path, error = %d\n",
+				    ccd->ccd_unit, error);
+#endif
+			free(cs->sc_cinfo, M_DEVBUF);
+			return (error);
+		}
+		ci->ci_path = malloc(ci->ci_pathlen, M_DEVBUF, M_WAITOK);
+		bcopy(tmppath, ci->ci_path, ci->ci_pathlen);
+
+		/*
+		 * XXX: Cache the component's dev_t.
+		 */
+		if (error = VOP_GETATTR(vp, &va, p->p_ucred, p)) {
+#ifdef DEBUG
+			if (ccddebug & (CCDB_FOLLOW|CCDB_INIT))
+				printf("ccd%d: %s: getattr failed %s = %d\n",
+				    ccd->ccd_unit, ci->ci_path,
+				    "error", error);
+#endif
+			free(ci->ci_path, M_DEVBUF);
+			free(cs->sc_cinfo, M_DEVBUF);
+			return (error);
+		}
+		ci->ci_dev = va.va_rdev;
+
+		/*
+		 * Get partition information for the component.
+		 */
+		if (error = VOP_IOCTL(vp, DIOCGPART, (caddr_t)&dpart,
+		    FREAD, p->p_ucred, p)) {
+#ifdef DEBUG
+			if (ccddebug & (CCDB_FOLLOW|CCDB_INIT))
+				 printf("ccd%d: %s: ioctl failed, error = %d\n",
+				     ccd->ccd_unit, ci->ci_path, error);
+#endif
+			free(ci->ci_path, M_DEVBUF);
+			free(cs->sc_cinfo, M_DEVBUF);
+			return (error);
+		}
+		if (dpart.part->p_fstype == FS_BSDFFS) {
+			maxsecsize =
+			    ((dpart.disklab->d_secsize > maxsecsize) ?
+			    dpart.disklab->d_secsize : maxsecsize);
+			size = dpart.part->p_size;
+		} else {
+#ifdef DEBUG
+			if (ccddebug & (CCDB_FOLLOW|CCDB_INIT))
+				printf("ccd%d: %s: incorrect partition type\n",
+				    ccd->ccd_unit, ci->ci_path);
+#endif
+			free(ci->ci_path, M_DEVBUF);
+			free(cs->sc_cinfo, M_DEVBUF);
+			return (EFTYPE);
+		}
+
+		/*
+		 * Calculate the size, truncating to an interleave
+		 * boundary if necessary.
+		 */
+		if (size < 0)
+			size = 0;
+
+		if (cs->sc_ileave > 1)
+			size -= size % cs->sc_ileave;
+
+		if (size == 0) {
+#ifdef DEBUG
+			if (ccddebug & (CCDB_FOLLOW|CCDB_INIT))
+				printf("ccd%d: %s: size == 0\n",
+				    ccd->ccd_unit, ci->ci_path);
+#endif
+			free(ci->ci_path, M_DEVBUF);
+			free(cs->sc_cinfo, M_DEVBUF);
+			return (ENODEV);
+		}
+
+		if (minsize == 0 || size < minsize)
+			minsize = size;
+		ci->ci_size = size;
+		cs->sc_size += size;
+	}
+
+	/*
+	 * Don't allow the interleave to be smaller than
+	 * the biggest component sector.
+	 */
+	if ((cs->sc_ileave > 0) &&
+	    (cs->sc_ileave < (maxsecsize / DEV_BSIZE))) {
+#ifdef DEBUG
+		if (ccddebug & (CCDB_FOLLOW|CCDB_INIT))
+			printf("ccd%d: interleave must be at least %d\n",
+			    ccd->ccd_unit, (maxsecsize / DEV_BSIZE));
+#endif
+		free(ci->ci_path, M_DEVBUF);
+		free(cs->sc_cinfo, M_DEVBUF);
+		return (EINVAL);
+	}
+
+	/*
+	 * If uniform interleave is desired set all sizes to that of
+	 * the smallest component.
+	 */
+	if (ccd->ccd_flags & CCDF_UNIFORM) {
+		for (ci = cs->sc_cinfo;
+		     ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++)
+			ci->ci_size = minsize;
+		cs->sc_size = cs->sc_nccdisks * minsize;
+	}
+
+	/*
+	 * Construct the interleave table.
+	 */
+	ccdinterleave(cs, ccd->ccd_unit);
+
+	/*
+	 * Create pseudo-geometry based on 1MB cylinders.  It's
+	 * pretty close.
+	 */
+	ccg->ccg_secsize = DEV_BSIZE;
+	ccg->ccg_ntracks = 1;
+	ccg->ccg_nsectors = 1024 * (1024 / ccg->ccg_secsize);
+	ccg->ccg_ncylinders = cs->sc_size / ccg->ccg_nsectors;
+
+#ifdef WORKING_DISK_STATISTICS		/* XXX !! */
+	if (ccd->ccd_dk >= 0)
+		dk_wpms[ccd->ccd_dk] = 32 * (60 * DEV_BSIZE / 2);     /* XXX */
+#endif
+
+	cs->sc_flags |= CCDF_INITED;
+	cs->sc_cflags = ccd->ccd_flags;	/* So we can find out later... */
+	cs->sc_unit = ccd->ccd_unit;
+	return (0);
+}
+
+static void
+ccdinterleave(cs, unit)
+	register struct ccd_softc *cs;
+	int unit;
+{
+	register struct ccdcinfo *ci, *smallci;
+	register struct ccdiinfo *ii;
+	register daddr_t bn, lbn;
+	register int ix;
+	u_long size;
+
+#ifdef DEBUG
+	if (ccddebug & CCDB_INIT)
+		printf("ccdinterleave(%x): ileave %d\n", cs, cs->sc_ileave);
+#endif
+	/*
+	 * Allocate an interleave table.
+	 * Chances are this is too big, but we don't care.
+	 */
+	size = (cs->sc_nccdisks + 1) * sizeof(struct ccdiinfo);
+	cs->sc_itable = (struct ccdiinfo *)malloc(size, M_DEVBUF, M_WAITOK);
+	bzero((caddr_t)cs->sc_itable, size);
+
+	/*
+	 * Trivial case: no interleave (actually interleave of disk size).
+	 * Each table entry represents a single component in its entirety.
+	 */
+	if (cs->sc_ileave == 0) {
+		bn = 0;
+		ii = cs->sc_itable;
+
+		for (ix = 0; ix < cs->sc_nccdisks; ix++) {
+			/* Allocate space for ii_index. */
+			ii->ii_index = malloc(sizeof(int), M_DEVBUF, M_WAITOK);
+			ii->ii_ndisk = 1;
+			ii->ii_startblk = bn;
+			ii->ii_startoff = 0;
+			ii->ii_index[0] = ix;
+			bn += cs->sc_cinfo[ix].ci_size;
+			ii++;
+		}
+		ii->ii_ndisk = 0;
+#ifdef DEBUG
+		if (ccddebug & CCDB_INIT)
+			printiinfo(cs->sc_itable);
+#endif
+		return;
+	}
+
+	/*
+	 * The following isn't fast or pretty; it doesn't have to be.
+	 */
+	size = 0;
+	bn = lbn = 0;
+	for (ii = cs->sc_itable; ; ii++) {
+		/* Allocate space for ii_index. */
+		ii->ii_index = malloc((sizeof(int) * cs->sc_nccdisks),
+		    M_DEVBUF, M_WAITOK);
+
+		/*
+		 * Locate the smallest of the remaining components
+		 */
+		smallci = NULL;
+		for (ci = cs->sc_cinfo;
+		     ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++)
+			if (ci->ci_size > size &&
+			    (smallci == NULL ||
+			     ci->ci_size < smallci->ci_size))
+				smallci = ci;
+
+		/*
+		 * Nobody left, all done
+		 */
+		if (smallci == NULL) {
+			ii->ii_ndisk = 0;
+			break;
+		}
+
+		/*
+		 * Record starting logical block and component offset
+		 */
+		ii->ii_startblk = bn / cs->sc_ileave;
+		ii->ii_startoff = lbn;
+
+		/*
+		 * Determine how many disks take part in this interleave
+		 * and record their indices.
+		 */
+		ix = 0;
+		for (ci = cs->sc_cinfo;
+		     ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++)
+			if (ci->ci_size >= smallci->ci_size)
+				ii->ii_index[ix++] = ci - cs->sc_cinfo;
+		ii->ii_ndisk = ix;
+		bn += ix * (smallci->ci_size - size);
+		lbn = smallci->ci_size / cs->sc_ileave;
+		size = smallci->ci_size;
+	}
+#ifdef DEBUG
+	if (ccddebug & CCDB_INIT)
+		printiinfo(cs->sc_itable);
+#endif
+}
+
+/* ARGSUSED */
+int
+ccdopen(dev, flags, fmt, p)
+	dev_t dev;
+	int flags, fmt;
+	struct proc *p;
+{
+	int unit = ccdunit(dev);
+	struct ccd_softc *cs;
+	struct disklabel *lp;
+	int error = 0, part, pmask;
+
+#ifdef DEBUG
+	if (ccddebug & CCDB_FOLLOW)
+		printf("ccdopen(%x, %x)\n", dev, flags);
+#endif
+	if (unit >= numccd)
+		return (ENXIO);
+	cs = &ccd_softc[unit];
+
+	if (error = ccdlock(cs))
+		return (error);
+
+	lp = &cs->sc_dkdev.dk_label;
+
+	part = DISKPART(dev);
+	pmask = (1 << part);
+
+	/*
+	 * If we're initialized, check to see if there are any other
+	 * open partitions.  If not, then it's safe to update
+	 * the in-core disklabel.
+	 */
+	if ((cs->sc_flags & CCDF_INITED) && (cs->sc_dkdev.dk_openmask == 0))
+		ccdgetdisklabel(dev);
+
+	/* Check that the partition exists. */
+	if (part != RAW_PART && ((part > lp->d_npartitions) ||
+	    (lp->d_partitions[part].p_fstype == FS_UNUSED))) {
+		error = ENXIO;
+		goto done;
+	}
+
+	/* Prevent our unit from being unconfigured while open. */
+	switch (fmt) {
+	case S_IFCHR:
+		cs->sc_dkdev.dk_copenmask |= pmask;
+		break;
+
+	case S_IFBLK:
+		cs->sc_dkdev.dk_bopenmask |= pmask;
+		break;
+	}
+	cs->sc_dkdev.dk_openmask =
+	    cs->sc_dkdev.dk_copenmask | cs->sc_dkdev.dk_bopenmask;
+
+ done:
+	ccdunlock(cs);
+	return (0);
+}
+
+/* ARGSUSED */
+int
+ccdclose(dev, flags, fmt, p)
+	dev_t dev;
+	int flags, fmt;
+	struct proc *p;
+{
+	int unit = ccdunit(dev);
+	struct ccd_softc *cs;
+	int error = 0, part;
+
+#ifdef DEBUG
+	if (ccddebug & CCDB_FOLLOW)
+		printf("ccdclose(%x, %x)\n", dev, flags);
+#endif
+
+	if (unit >= numccd)
+		return (ENXIO);
+	cs = &ccd_softc[unit];
+
+	if (error = ccdlock(cs))
+		return (error);
+
+	part = DISKPART(dev);
+
+	/* ...that much closer to allowing unconfiguration... */
+	switch (fmt) {
+	case S_IFCHR:
+		cs->sc_dkdev.dk_copenmask &= ~(1 << part);
+		break;
+
+	case S_IFBLK:
+		cs->sc_dkdev.dk_bopenmask &= ~(1 << part);
+		break;
+	}
+	cs->sc_dkdev.dk_openmask =
+	    cs->sc_dkdev.dk_copenmask | cs->sc_dkdev.dk_bopenmask;
+
+	ccdunlock(cs);
+	return (0);
+}
+
+void
+ccdstrategy(bp)
+	register struct buf *bp;
+{
+	register int unit = ccdunit(bp->b_dev);
+	register struct ccd_softc *cs = &ccd_softc[unit];
+	register daddr_t bn;
+	register int sz, s;
+	int wlabel;
+	struct disklabel *lp;
+
+#ifdef DEBUG
+	if (ccddebug & CCDB_FOLLOW)
+		printf("ccdstrategy(%x): unit %d\n", bp, unit);
+#endif
+	if ((cs->sc_flags & CCDF_INITED) == 0) {
+		bp->b_error = ENXIO;
+		bp->b_flags |= B_ERROR;
+		goto done;
+	}
+
+	/* If it's a nil transfer, wake up the top half now. */
+	if (bp->b_bcount == 0)
+		goto done;
+
+	lp = &cs->sc_dkdev.dk_label;
+
+	/*
+	 * Do bounds checking and adjust transfer.  If there's an
+	 * error, the bounds check will flag that for us.
+	 */
+	wlabel = cs->sc_flags & (CCDF_WLABEL|CCDF_LABELLING);
+	if (DISKPART(bp->b_dev) != RAW_PART)
+		if (bounds_check_with_label(bp, lp, wlabel) <= 0)
+			goto done;
+
+	bp->b_resid = bp->b_bcount;
+
+	/*
+	 * "Start" the unit.
+	 */
+	s = splbio();
+	ccdstart(cs, bp);
+	splx(s);
+	return;
+done:
+	biodone(bp);
+}
+
+static void
+ccdstart(cs, bp)
+	register struct ccd_softc *cs;
+	register struct buf *bp;
+{
+	register long bcount, rcount;
+	struct ccdbuf *cbp;
+	caddr_t addr;
+	daddr_t bn;
+	struct partition *pp;
+
+#ifdef DEBUG
+	if (ccddebug & CCDB_FOLLOW)
+		printf("ccdstart(%x, %x)\n", cs, bp);
+#endif
+
+#ifdef WORKING_DISK_STATISTICS		/* XXX !! */
+	/*
+	 * Instrumentation (not very meaningful)
+	 */
+	cs->sc_nactive++;
+	if (cs->sc_dk >= 0) {
+		dk_busy |= 1 << cs->sc_dk;
+		dk_xfer[cs->sc_dk]++;
+		dk_wds[cs->sc_dk] += bp->b_bcount >> 6;
+	}
+#endif
+
+	/*
+	 * Translate the partition-relative block number to an absolute.
+	 */
+	bn = bp->b_blkno;
+	if (DISKPART(bp->b_dev) != RAW_PART) {
+		pp = &cs->sc_dkdev.dk_label.d_partitions[DISKPART(bp->b_dev)];
+		bn += pp->p_offset;
+	}
+
+	/*
+	 * Allocate component buffers and fire off the requests
+	 */
+	addr = bp->b_data;
+	for (bcount = bp->b_bcount; bcount > 0; bcount -= rcount) {
+		cbp = ccdbuffer(cs, bp, bn, addr, bcount);
+		rcount = cbp->cb_buf.b_bcount;
+		if ((cbp->cb_buf.b_flags & B_READ) == 0)
+			cbp->cb_buf.b_vp->v_numoutput++;
+		VOP_STRATEGY(&cbp->cb_buf);
+		bn += btodb(rcount);
+		addr += rcount;
+	}
+}
+
+/*
+ * Build a component buffer header.
+ */
+static struct ccdbuf *
+ccdbuffer(cs, bp, bn, addr, bcount)
+	register struct ccd_softc *cs;
+	struct buf *bp;
+	daddr_t bn;
+	caddr_t addr;
+	long bcount;
+{
+	register struct ccdcinfo *ci;
+	register struct ccdbuf *cbp;
+	register daddr_t cbn, cboff;
+
+#ifdef DEBUG
+	if (ccddebug & CCDB_IO)
+		printf("ccdbuffer(%x, %x, %d, %x, %d)\n",
+		       cs, bp, bn, addr, bcount);
+#endif
+	/*
+	 * Determine which component bn falls in.
+	 */
+	cbn = bn;
+	cboff = 0;
+
+	/*
+	 * Serially concatenated
+	 */
+	if (cs->sc_ileave == 0) {
+		register daddr_t sblk;
+
+		sblk = 0;
+		for (ci = cs->sc_cinfo; cbn >= sblk + ci->ci_size; ci++)
+			sblk += ci->ci_size;
+		cbn -= sblk;
+	}
+	/*
+	 * Interleaved
+	 */
+	else {
+		register struct ccdiinfo *ii;
+		int ccdisk, off;
+
+		cboff = cbn % cs->sc_ileave;
+		cbn /= cs->sc_ileave;
+		for (ii = cs->sc_itable; ii->ii_ndisk; ii++)
+			if (ii->ii_startblk > cbn)
+				break;
+		ii--;
+		off = cbn - ii->ii_startblk;
+		if (ii->ii_ndisk == 1) {
+			ccdisk = ii->ii_index[0];
+			cbn = ii->ii_startoff + off;
+		} else {
+			ccdisk = ii->ii_index[off % ii->ii_ndisk];
+			cbn = ii->ii_startoff + off / ii->ii_ndisk;
+		}
+		cbn *= cs->sc_ileave;
+		ci = &cs->sc_cinfo[ccdisk];
+	}
+
+	/*
+	 * Fill in the component buf structure.
+	 */
+	cbp = getccdbuf();
+	cbp->cb_buf.b_flags = bp->b_flags | B_CALL;
+	cbp->cb_buf.b_iodone = (void (*)())ccdiodone;
+	cbp->cb_buf.b_proc = bp->b_proc;
+	cbp->cb_buf.b_dev = ci->ci_dev;		/* XXX */
+	cbp->cb_buf.b_blkno = cbn + cboff;
+	cbp->cb_buf.b_data = addr;
+	cbp->cb_buf.b_vp = ci->ci_vp;
+	if (cs->sc_ileave == 0)
+		cbp->cb_buf.b_bcount = dbtob(ci->ci_size - cbn);
+	else
+		cbp->cb_buf.b_bcount = dbtob(cs->sc_ileave - cboff);
+	if (cbp->cb_buf.b_bcount > bcount)
+		cbp->cb_buf.b_bcount = bcount;
+
+	/*
+	 * context for ccdiodone
+	 */
+	cbp->cb_obp = bp;
+	cbp->cb_unit = cs - ccd_softc;
+	cbp->cb_comp = ci - cs->sc_cinfo;
+
+#ifdef DEBUG
+	if (ccddebug & CCDB_IO)
+		printf(" dev %x(u%d): cbp %x bn %d addr %x bcnt %d\n",
+		       ci->ci_dev, ci-cs->sc_cinfo, cbp, cbp->cb_buf.b_blkno,
+		       cbp->cb_buf.b_data, cbp->cb_buf.b_bcount);
+#endif
+	return (cbp);
+}
+
+static void
+ccdintr(cs, bp)
+	register struct ccd_softc *cs;
+	register struct buf *bp;
+{
+
+#ifdef DEBUG
+	if (ccddebug & CCDB_FOLLOW)
+		printf("ccdintr(%x, %x)\n", cs, bp);
+#endif
+	/*
+	 * Request is done for better or worse, wakeup the top half.
+	 */
+#ifdef WORKING_DISK_STATISTICS		/* XXX !! */
+	--cs->sc_nactive;
+#ifdef DIAGNOSTIC
+	if (cs->sc_nactive < 0)
+		panic("ccdintr: ccd%d: sc_nactive < 0", cs->sc_unit);
+#endif
+
+	if (cs->sc_nactive == 0 && cs->sc_dk >= 0)
+		dk_busy &= ~(1 << cs->sc_dk);
+#endif
+	if (bp->b_flags & B_ERROR)
+		bp->b_resid = bp->b_bcount;
+	biodone(bp);
+}
+
+/*
+ * Called at interrupt time.
+ * Mark the component as done and if all components are done,
+ * take a ccd interrupt.
+ */
+void
+ccdiodone(cbp)
+	struct ccdbuf *cbp;
+{
+	register struct buf *bp = cbp->cb_obp;
+	register int unit = cbp->cb_unit;
+	int count, s;
+
+	s = splbio();
+#ifdef DEBUG
+	if (ccddebug & CCDB_FOLLOW)
+		printf("ccdiodone(%x)\n", cbp);
+	if (ccddebug & CCDB_IO) {
+		printf("ccdiodone: bp %x bcount %d resid %d\n",
+		       bp, bp->b_bcount, bp->b_resid);
+		printf(" dev %x(u%d), cbp %x bn %d addr %x bcnt %d\n",
+		       cbp->cb_buf.b_dev, cbp->cb_comp, cbp,
+		       cbp->cb_buf.b_blkno, cbp->cb_buf.b_data,
+		       cbp->cb_buf.b_bcount);
+	}
+#endif
+
+	if (cbp->cb_buf.b_flags & B_ERROR) {
+		bp->b_flags |= B_ERROR;
+		bp->b_error = cbp->cb_buf.b_error ? cbp->cb_buf.b_error : EIO;
+#ifdef DEBUG
+		printf("ccd%d: error %d on component %d\n",
+		       unit, bp->b_error, cbp->cb_comp);
+#endif
+	}
+	count = cbp->cb_buf.b_bcount;
+	putccdbuf(cbp);
+
+	/*
+	 * If all done, "interrupt".
+	 */
+	bp->b_resid -= count;
+	if (bp->b_resid < 0)
+		panic("ccdiodone: count");
+	if (bp->b_resid == 0)
+		ccdintr(&ccd_softc[unit], bp);
+	splx(s);
+}
+
+/* ARGSUSED */
+int
+ccdread(dev, uio, flags)
+	dev_t dev;
+	struct uio *uio;
+	int flags;
+{
+	int unit = ccdunit(dev);
+	struct ccd_softc *cs;
+
+#ifdef DEBUG
+	if (ccddebug & CCDB_FOLLOW)
+		printf("ccdread(%x, %x)\n", dev, uio);
+#endif
+	if (unit >= numccd)
+		return (ENXIO);
+	cs = &ccd_softc[unit];
+
+	if ((cs->sc_flags & CCDF_INITED) == 0)
+		return (ENXIO);
+
+	/*
+	 * XXX: It's not clear that using minphys() is completely safe,
+	 * in particular, for raw I/O.  Underlying devices might have some
+	 * non-obvious limits, because of the copy to user-space.
+	 */
+	return (physio(ccdstrategy, NULL, dev, B_READ, minphys, uio));
+}
+
+/* ARGSUSED */
+int
+ccdwrite(dev, uio, flags)
+	dev_t dev;
+	struct uio *uio;
+	int flags;
+{
+	int unit = ccdunit(dev);
+	struct ccd_softc *cs;
+
+#ifdef DEBUG
+	if (ccddebug & CCDB_FOLLOW)
+		printf("ccdwrite(%x, %x)\n", dev, uio);
+#endif
+	if (unit >= numccd)
+		return (ENXIO);
+	cs = &ccd_softc[unit];
+
+	if ((cs->sc_flags & CCDF_INITED) == 0)
+		return (ENXIO);
+
+	/*
+	 * XXX: It's not clear that using minphys() is completely safe,
+	 * in particular, for raw I/O.  Underlying devices might have some
+	 * non-obvious limits, because of the copy to user-space.
+	 */
+	return (physio(ccdstrategy, NULL, dev, B_WRITE, minphys, uio));
+}
+
+int
+ccdioctl(dev, cmd, data, flag, p)
+	dev_t dev;
+	u_long cmd;
+	caddr_t data;
+	int flag;
+	struct proc *p;
+{
+	int unit = ccdunit(dev);
+	int i, j, lookedup = 0, error = 0;
+	int part, pmask, s;
+	struct ccd_softc *cs;
+	struct ccd_ioctl *ccio = (struct ccd_ioctl *)data;
+	struct ccddevice ccd;
+	char **cpp;
+	struct vnode **vpp;
+#ifdef WORKING_DISK_STATISTICS		/* XXX !! */
+	extern int dkn;
+#endif
+
+	if (unit >= numccd)
+		return (ENXIO);
+	cs = &ccd_softc[unit];
+
+	bzero(&ccd, sizeof(ccd));
+
+	switch (cmd) {
+	case CCDIOCSET:
+		if (cs->sc_flags & CCDF_INITED)
+			return (EBUSY);
+
+		if ((flag & FWRITE) == 0)
+			return (EBADF);
+
+		if (error = ccdlock(cs))
+			return (error);
+
+		/* Fill in some important bits. */
+		ccd.ccd_unit = unit;
+		ccd.ccd_interleave = ccio->ccio_ileave;
+		ccd.ccd_flags = ccio->ccio_flags & CCDF_USERMASK;
+
+		/*
+		 * Allocate space for and copy in the array of
+		 * componet pathnames and device numbers.
+		 */
+		cpp = malloc(ccio->ccio_ndisks * sizeof(char *),
+		    M_DEVBUF, M_WAITOK);
+		vpp = malloc(ccio->ccio_ndisks * sizeof(struct vnode *),
+		    M_DEVBUF, M_WAITOK);
+
+		error = copyin((caddr_t)ccio->ccio_disks, (caddr_t)cpp,
+		    ccio->ccio_ndisks * sizeof(char **));
+		if (error) {
+			free(vpp, M_DEVBUF);
+			free(cpp, M_DEVBUF);
+			ccdunlock(cs);
+			return (error);
+		}
+
+#ifdef DEBUG
+		if (ccddebug & CCDB_INIT)
+			for (i = 0; i < ccio->ccio_ndisks; ++i)
+				printf("ccdioctl: component %d: 0x%x\n",
+				    i, cpp[i]);
+#endif
+
+		for (i = 0; i < ccio->ccio_ndisks; ++i) {
+#ifdef DEBUG
+			if (ccddebug & CCDB_INIT)
+				printf("ccdioctl: lookedup = %d\n", lookedup);
+#endif
+			if (error = ccdlookup(cpp[i], p, &vpp[i])) {
+				for (j = 0; j < lookedup; ++j)
+					(void)vn_close(vpp[j], FREAD|FWRITE,
+					    p->p_ucred, p);
+				free(vpp, M_DEVBUF);
+				free(cpp, M_DEVBUF);
+				ccdunlock(cs);
+				return (error);
+			}
+			++lookedup;
+		}
+		ccd.ccd_cpp = cpp;
+		ccd.ccd_vpp = vpp;
+		ccd.ccd_ndev = ccio->ccio_ndisks;
+
+#ifdef WORKING_DISK_STATISTICS		/* XXX !! */
+		/*
+		 * Assign disk index first so that init routine
+		 * can use it (saves having the driver drag around
+		 * the ccddevice pointer just to set up the dk_*
+		 * info in the open routine).
+		 */
+		if (dkn < DK_NDRIVE)
+			ccd.ccd_dk = dkn++;
+		else
+			ccd.ccd_dk = -1;
+#endif
+
+		/*
+		 * Initialize the ccd.  Fills in the softc for us.
+		 */
+		if (error = ccdinit(&ccd, cpp, p)) {
+#ifdef WORKING_DISK_STATISTICS		/* XXX !! */
+			if (ccd.ccd_dk >= 0)
+				--dkn;
+#endif
+			for (j = 0; j < lookedup; ++j)
+				(void)vn_close(vpp[j], FREAD|FWRITE,
+				    p->p_ucred, p);
+			bzero(&ccd_softc[unit], sizeof(struct ccd_softc));
+			free(vpp, M_DEVBUF);
+			free(cpp, M_DEVBUF);
+			ccdunlock(cs);
+			return (error);
+		}
+
+		/*
+		 * The ccd has been successfully initialized, so
+		 * we can place it into the array and read the disklabel.
+		 */
+		bcopy(&ccd, &ccddevs[unit], sizeof(ccd));
+		ccio->ccio_unit = unit;
+		ccio->ccio_size = cs->sc_size;
+		ccdgetdisklabel(dev);
+
+		ccdunlock(cs);
+
+		break;
+
+	case CCDIOCCLR:
+		if ((cs->sc_flags & CCDF_INITED) == 0)
+			return (ENXIO);
+
+		if ((flag & FWRITE) == 0)
+			return (EBADF);
+
+		if (error = ccdlock(cs))
+			return (error);
+
+		/*
+		 * Don't unconfigure if any other partitions are open
+		 * or if both the character and block flavors of this
+		 * partition are open.
+		 */
+		part = DISKPART(dev);
+		pmask = (1 << part);
+		if ((cs->sc_dkdev.dk_openmask & ~pmask) ||
+		    ((cs->sc_dkdev.dk_bopenmask & pmask) &&
+		    (cs->sc_dkdev.dk_copenmask & pmask))) {
+			ccdunlock(cs);
+			return (EBUSY);
+		}
+
+		/*
+		 * Free ccd_softc information and clear entry.
+		 */
+
+		/* Close the components and free their pathnames. */
+		for (i = 0; i < cs->sc_nccdisks; ++i) {
+			/*
+			 * XXX: this close could potentially fail and
+			 * cause Bad Things.  Maybe we need to force
+			 * the close to happen?
+			 */
+#ifdef DEBUG
+			if (ccddebug & CCDB_VNODE)
+				vprint("CCDIOCCLR: vnode info",
+				    cs->sc_cinfo[i].ci_vp);
+#endif
+			(void)vn_close(cs->sc_cinfo[i].ci_vp, FREAD|FWRITE,
+			    p->p_ucred, p);
+			free(cs->sc_cinfo[i].ci_path, M_DEVBUF);
+		}
+
+		/* Free interleave index. */
+		for (i = 0; cs->sc_itable[i].ii_ndisk; ++i)
+			free(cs->sc_itable[i].ii_index, M_DEVBUF);
+
+		/* Free component info and interleave table. */
+		free(cs->sc_cinfo, M_DEVBUF);
+		free(cs->sc_itable, M_DEVBUF);
+		cs->sc_flags &= ~CCDF_INITED;
+
+		/*
+		 * Free ccddevice information and clear entry.
+		 */
+		free(ccddevs[unit].ccd_cpp, M_DEVBUF);
+		free(ccddevs[unit].ccd_vpp, M_DEVBUF);
+		ccd.ccd_dk = -1;
+		bcopy(&ccd, &ccddevs[unit], sizeof(ccd));
+
+		/* This must be atomic. */
+		s = splhigh();
+		ccdunlock(cs);
+		bzero(cs, sizeof(struct ccd_softc));
+		splx(s);
+
+		break;
+
+	case DIOCGDINFO:
+		if ((cs->sc_flags & CCDF_INITED) == 0)
+			return (ENXIO);
+
+		*(struct disklabel *)data = cs->sc_dkdev.dk_label;
+		break;
+
+	case DIOCGPART:
+		if ((cs->sc_flags & CCDF_INITED) == 0)
+			return (ENXIO);
+
+		((struct partinfo *)data)->disklab = &cs->sc_dkdev.dk_label;
+		((struct partinfo *)data)->part =
+		    &cs->sc_dkdev.dk_label.d_partitions[DISKPART(dev)];
+		break;
+
+	case DIOCWDINFO:
+	case DIOCSDINFO:
+		if ((cs->sc_flags & CCDF_INITED) == 0)
+			return (ENXIO);
+
+		if ((flag & FWRITE) == 0)
+			return (EBADF);
+
+		if (error = ccdlock(cs))
+			return (error);
+
+		cs->sc_flags |= CCDF_LABELLING;
+
+		error = setdisklabel(&cs->sc_dkdev.dk_label,
+		    (struct disklabel *)data, 0, &cs->sc_dkdev.dk_cpulabel);
+		if (error == 0) {
+			if (cmd == DIOCWDINFO)
+				error = writedisklabel(CCDLABELDEV(dev),
+				    ccdstrategy, &cs->sc_dkdev.dk_label,
+				    &cs->sc_dkdev.dk_cpulabel);
+		}
+
+		cs->sc_flags &= ~CCDF_LABELLING;
+
+		ccdunlock(cs);
+
+		if (error)
+			return (error);
+		break;
+
+	case DIOCWLABEL:
+		if ((cs->sc_flags & CCDF_INITED) == 0)
+			return (ENXIO);
+
+		if ((flag & FWRITE) == 0)
+			return (EBADF);
+		if (*(int *)data != 0)
+			cs->sc_flags |= CCDF_WLABEL;
+		else
+			cs->sc_flags &= ~CCDF_WLABEL;
+		break;
+
+	default:
+		return (ENOTTY);
+	}
+
+	return (0);
+}
+
+int
+ccdsize(dev)
+	dev_t dev;
+{
+	struct ccd_softc *cs;
+	int part, size;
+
+	if (ccdopen(dev, 0, S_IFBLK, curproc))
+		return (-1);
+
+	cs = &ccd_softc[ccdunit(dev)];
+	part = DISKPART(dev);
+
+	if ((cs->sc_flags & CCDF_INITED) == 0)
+		return (-1);
+
+	if (cs->sc_dkdev.dk_label.d_partitions[part].p_fstype != FS_SWAP)
+		size = -1;
+	else
+		size = cs->sc_dkdev.dk_label.d_partitions[part].p_size;
+
+	if (ccdclose(dev, 0, S_IFBLK, curproc))
+		return (-1);
+
+	return (size);
+}
+
+int
+ccddump(dev, blkno, va, size)
+	dev_t dev;
+	daddr_t blkno;
+	caddr_t va;
+	size_t size;
+{
+
+	/* Not implemented. */
+	return ENXIO;
+}
+
+/*
+ * 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.
+ */
+static int
+ccdlookup(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_USERSPACE, path, p);
+	if (error = vn_open(&nd, FREAD|FWRITE, 0)) {
+#ifdef DEBUG
+		if (ccddebug & CCDB_FOLLOW|CCDB_INIT)
+			printf("ccdlookup: vn_open error = %d\n", error);
+#endif
+		return (error);
+	}
+	vp = nd.ni_vp;
+
+	if (vp->v_usecount > 1) {
+		VOP_UNLOCK(vp);
+		(void)vn_close(vp, FREAD|FWRITE, p->p_ucred, p);
+		return (EBUSY);
+	}
+
+	if (error = VOP_GETATTR(vp, &va, p->p_ucred, p)) {
+#ifdef DEBUG
+		if (ccddebug & CCDB_FOLLOW|CCDB_INIT)
+			printf("ccdlookup: getattr error = %d\n", error);
+#endif
+		VOP_UNLOCK(vp);
+		(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);
+		(void)vn_close(vp, FREAD|FWRITE, p->p_ucred, p);
+		return (ENOTBLK);
+	}
+
+#ifdef DEBUG
+	if (ccddebug & CCDB_VNODE)
+		vprint("ccdlookup: vnode info", vp);
+#endif
+
+	VOP_UNLOCK(vp);
+	*vpp = vp;
+	return (0);
+}
+
+/*
+ * Read the disklabel from the ccd.  If one is not present, fake one
+ * up.
+ */
+static void
+ccdgetdisklabel(dev)
+	dev_t dev;
+{
+	int unit = ccdunit(dev);
+	struct ccd_softc *cs = &ccd_softc[unit];
+	char *errstring;
+	struct disklabel *lp = &cs->sc_dkdev.dk_label;
+	struct cpu_disklabel *clp = &cs->sc_dkdev.dk_cpulabel;
+	struct ccdgeom *ccg = &cs->sc_geom;
+
+	bzero(lp, sizeof(*lp));
+	bzero(clp, sizeof(*clp));
+
+	lp->d_secperunit = cs->sc_size;
+	lp->d_secsize = ccg->ccg_secsize;
+	lp->d_nsectors = ccg->ccg_nsectors;
+	lp->d_ntracks = ccg->ccg_ntracks;
+	lp->d_ncylinders = ccg->ccg_ncylinders;
+	lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors;
+
+	strncpy(lp->d_typename, "ccd", sizeof(lp->d_typename));
+	lp->d_type = DTYPE_CCD;
+	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 = cs->sc_size;
+	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(&cs->sc_dkdev.dk_label);
+
+	/*
+	 * Call the generic disklabel extraction routine.
+	 */
+	if (errstring = readdisklabel(CCDLABELDEV(dev), ccdstrategy,
+	    &cs->sc_dkdev.dk_label, &cs->sc_dkdev.dk_cpulabel))
+		ccdmakedisklabel(cs);
+
+#ifdef DEBUG
+	/* It's actually extremely common to have unlabeled ccds. */
+	if (ccddebug & CCDB_LABEL)
+		if (errstring != NULL)
+			printf("ccd%d: %s\n", unit, errstring);
+#endif
+}
+
+/*
+ * Take care of things one might want to take care of in the event
+ * that a disklabel isn't present.
+ */
+static void
+ccdmakedisklabel(cs)
+	struct ccd_softc *cs;
+{
+	struct disklabel *lp = &cs->sc_dkdev.dk_label;
+
+	/*
+	 * 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));
+}
+
+/*
+ * Wait interruptibly for an exclusive lock.
+ *
+ * XXX
+ * Several drivers do this; it should be abstracted and made MP-safe.
+ */
+static int
+ccdlock(cs)
+	struct ccd_softc *cs;
+{
+	int error;
+
+	while ((cs->sc_flags & CCDF_LOCKED) != 0) {
+		cs->sc_flags |= CCDF_WANTED;
+		if ((error = tsleep(cs, PRIBIO | PCATCH, "ccdlck", 0)) != 0)
+			return (error);
+	}
+	cs->sc_flags |= CCDF_LOCKED;
+	return (0);
+}
+
+/*
+ * Unlock and wake up any waiters.
+ */
+static void
+ccdunlock(cs)
+	struct ccd_softc *cs;
+{
+
+	cs->sc_flags &= ~CCDF_LOCKED;
+	if ((cs->sc_flags & CCDF_WANTED) != 0) {
+		cs->sc_flags &= ~CCDF_WANTED;
+		wakeup(cs);
+	}
+}
+
+#ifdef DEBUG
+static void
+printiinfo(ii)
+	struct ccdiinfo *ii;
+{
+	register int ix, i;
+
+	for (ix = 0; ii->ii_ndisk; ix++, ii++) {
+		printf(" itab[%d]: #dk %d sblk %d soff %d",
+		       ix, ii->ii_ndisk, ii->ii_startblk, ii->ii_startoff);
+		for (i = 0; i < ii->ii_ndisk; i++)
+			printf(" %d", ii->ii_index[i]);
+		printf("\n");
+	}
+}
+#endif