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ccdvar.h
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ccdvar.h
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/* $Id: ccdvar.h,v 1.7 1998/09/15 10:07:26 gibbs Exp $ */
/* $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 */
#define CCDF_MIRROR 0x04 /* use mirroring */
#define CCDF_PARITY 0x08 /* use parity (RAID level 5) */
/* Mask of user-settable ccd flags. */
#define CCDF_USERMASK (CCDF_SWAP|CCDF_UNIFORM|CCDF_MIRROR|CCDF_PARITY)
/*
* 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 */
struct devstat device_stats; /* device statistics */
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 */