ccdvar.h from NetBSD-1.1.

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+/*	$NetBSD: ccdvar.h,v 1.7.2.1 1995/10/12 21:30:18 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 $Hdr: cdvar.h 1.1 90/07/09$
+ *
+ *	@(#)cdvar.h	8.1 (Berkeley) 6/10/93
+ */
+
+/*
+ * 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
+ */
+
+/*
+ * A concatenated disk is described at initialization time by this structure.
+ */
+struct ccddevice {
+	int		ccd_unit;	/* logical unit of this ccd */
+	int		ccd_interleave;	/* interleave (DEV_BSIZE blocks) */
+	int		ccd_flags;	/* misc. information */
+	int		ccd_dk;		/* disk number */
+	struct vnode	**ccd_vpp;	/* array of component vnodes */
+	char		**ccd_cpp;	/* array of component pathnames */
+	int		ccd_ndev;	/* number of component devices */
+};
+
+/*
+ * This structure is used to configure a ccd via ioctl(2).
+ */
+struct ccd_ioctl {
+	char	**ccio_disks;		/* pointer to component paths */
+	int	ccio_ndisks;		/* number of disks to concatenate */
+	int	ccio_ileave;		/* interleave (DEV_BSIZE blocks) */
+	int	ccio_flags;		/* misc. information */
+	int	ccio_unit;		/* unit number: use varies */
+	size_t	ccio_size;		/* (returned) size of ccd */
+};
+
+/* ccd_flags */
+#define	CCDF_SWAP	0x01	/* interleave should be dmmax */
+#define CCDF_UNIFORM	0x02	/* use LCCD of sizes for uniform interleave */
+
+/* Mask of user-settable ccd flags. */
+#define CCDF_USERMASK	(CCDF_SWAP|CCDF_UNIFORM)
+
+/*
+ * Component info table.
+ * Describes a single component of a concatenated disk.
+ */
+struct ccdcinfo {
+	struct vnode	*ci_vp;			/* device's vnode */
+	dev_t		ci_dev;			/* XXX: device's dev_t */
+	size_t		ci_size; 		/* size */
+	char		*ci_path;		/* path to component */
+	size_t		ci_pathlen;		/* length of component path */
+};
+
+/*
+ * Interleave description table.
+ * Computed at boot time to speed irregular-interleave lookups.
+ * The idea is that we interleave in "groups".  First we interleave
+ * evenly over all component disks up to the size of the smallest
+ * component (the first group), then we interleave evenly over all
+ * remaining disks up to the size of the next-smallest (second group),
+ * and so on.
+ *
+ * Each table entry describes the interleave characteristics of one
+ * of these groups.  For example if a concatenated disk consisted of
+ * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at
+ * DEV_BSIZE (1), the table would have three entries:
+ *
+ *	ndisk	startblk	startoff	dev
+ *	3	0		0		0, 1, 2
+ *	2	9		3		0, 2
+ *	1	13		5		2
+ *	0	-		-		-
+ *
+ * which says that the first nine blocks (0-8) are interleaved over
+ * 3 disks (0, 1, 2) starting at block offset 0 on any component disk,
+ * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting
+ * at component block 3, and the remaining blocks (13-14) are on disk
+ * 2 starting at offset 5.
+ */
+struct ccdiinfo {
+	int	ii_ndisk;	/* # of disks range is interleaved over */
+	daddr_t	ii_startblk;	/* starting scaled block # for range */
+	daddr_t	ii_startoff;	/* starting component offset (block #) */
+	int	*ii_index;	/* ordered list of components in range */
+};
+
+/*
+ * Concatenated disk pseudo-geometry information.
+ */
+struct ccdgeom {
+	u_int32_t	ccg_secsize;	/* # bytes per sector */
+	u_int32_t	ccg_nsectors;	/* # data sectors per track */
+	u_int32_t	ccg_ntracks;	/* # tracks per cylinder */
+	u_int32_t	ccg_ncylinders;	/* # cylinders per unit */
+};
+
+/*
+ * A concatenated disk is described after initialization by this structure.
+ */
+struct ccd_softc {
+	int		 sc_unit;		/* logical unit number */
+	int		 sc_flags;		/* flags */
+	int		 sc_cflags;		/* configuration flags */
+	size_t		 sc_size;		/* size of ccd */
+	int		 sc_ileave;		/* interleave */
+	int		 sc_nccdisks;		/* number of components */
+	struct ccdcinfo	 *sc_cinfo;		/* component info */
+	struct ccdiinfo	 *sc_itable;		/* interleave table */
+	int		 sc_nactive;		/* number of requests active */
+	int		 sc_dk;			/* disk index */
+	struct ccdgeom   sc_geom;		/* pseudo geometry info */
+	struct dkdevice	 sc_dkdev;		/* generic disk device info */
+};
+
+/* sc_flags */
+#define CCDF_INITED	0x01	/* unit has been initialized */
+#define CCDF_WLABEL	0x02	/* label area is writable */
+#define CCDF_LABELLING	0x04	/* unit is currently being labelled */
+#define CCDF_WANTED	0x40	/* someone is waiting to obtain a lock */
+#define CCDF_LOCKED	0x80	/* unit is locked */
+
+/*
+ * Before you can use a unit, it must be configured with CCDIOCSET.
+ * The configuration persists across opens and closes of the device;
+ * a CCDIOCCLR must be used to reset a configuration.  An attempt to
+ * CCDIOCSET an already active unit will return EBUSY.  Attempts to
+ * CCDIOCCLR an inactive unit will return ENXIO.
+ */
+#define CCDIOCSET	_IOWR('F', 16, struct ccd_ioctl)   /* enable ccd */
+#define CCDIOCCLR	_IOW('F', 17, struct ccd_ioctl)    /* disable ccd */