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ccdvar.h revision 1.9
      1  1.9  thorpej /*	$NetBSD: ccdvar.h,v 1.9 1996/01/07 22:03:30 thorpej Exp $	*/
      2  1.5  thorpej 
      3  1.5  thorpej /*
      4  1.5  thorpej  * Copyright (c) 1995 Jason R. Thorpe.
      5  1.5  thorpej  * All rights reserved.
      6  1.5  thorpej  *
      7  1.5  thorpej  * Redistribution and use in source and binary forms, with or without
      8  1.5  thorpej  * modification, are permitted provided that the following conditions
      9  1.5  thorpej  * are met:
     10  1.5  thorpej  * 1. Redistributions of source code must retain the above copyright
     11  1.5  thorpej  *    notice, this list of conditions and the following disclaimer.
     12  1.5  thorpej  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.5  thorpej  *    notice, this list of conditions and the following disclaimer in the
     14  1.5  thorpej  *    documentation and/or other materials provided with the distribution.
     15  1.5  thorpej  * 3. All advertising materials mentioning features or use of this software
     16  1.5  thorpej  *    must display the following acknowledgement:
     17  1.5  thorpej  *	This product includes software developed for the NetBSD Project
     18  1.5  thorpej  *	by Jason R. Thorpe.
     19  1.5  thorpej  * 4. The name of the author may not be used to endorse or promote products
     20  1.5  thorpej  *    derived from this software without specific prior written permission.
     21  1.5  thorpej  *
     22  1.5  thorpej  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     23  1.5  thorpej  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  1.5  thorpej  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  1.5  thorpej  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     26  1.5  thorpej  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     27  1.5  thorpej  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     28  1.5  thorpej  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     29  1.5  thorpej  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     30  1.5  thorpej  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  1.5  thorpej  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  1.5  thorpej  * SUCH DAMAGE.
     33  1.5  thorpej  */
     34  1.2      cgd 
     35  1.1  hpeyerl /*
     36  1.1  hpeyerl  * Copyright (c) 1988 University of Utah.
     37  1.3  hpeyerl  * Copyright (c) 1990, 1993
     38  1.3  hpeyerl  *	The Regents of the University of California.  All rights reserved.
     39  1.1  hpeyerl  *
     40  1.1  hpeyerl  * This code is derived from software contributed to Berkeley by
     41  1.1  hpeyerl  * the Systems Programming Group of the University of Utah Computer
     42  1.1  hpeyerl  * Science Department.
     43  1.1  hpeyerl  *
     44  1.1  hpeyerl  * Redistribution and use in source and binary forms, with or without
     45  1.1  hpeyerl  * modification, are permitted provided that the following conditions
     46  1.1  hpeyerl  * are met:
     47  1.1  hpeyerl  * 1. Redistributions of source code must retain the above copyright
     48  1.1  hpeyerl  *    notice, this list of conditions and the following disclaimer.
     49  1.1  hpeyerl  * 2. Redistributions in binary form must reproduce the above copyright
     50  1.1  hpeyerl  *    notice, this list of conditions and the following disclaimer in the
     51  1.1  hpeyerl  *    documentation and/or other materials provided with the distribution.
     52  1.1  hpeyerl  * 3. All advertising materials mentioning features or use of this software
     53  1.1  hpeyerl  *    must display the following acknowledgement:
     54  1.1  hpeyerl  *	This product includes software developed by the University of
     55  1.1  hpeyerl  *	California, Berkeley and its contributors.
     56  1.1  hpeyerl  * 4. Neither the name of the University nor the names of its contributors
     57  1.1  hpeyerl  *    may be used to endorse or promote products derived from this software
     58  1.1  hpeyerl  *    without specific prior written permission.
     59  1.1  hpeyerl  *
     60  1.1  hpeyerl  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     61  1.1  hpeyerl  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     62  1.1  hpeyerl  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     63  1.1  hpeyerl  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     64  1.1  hpeyerl  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     65  1.1  hpeyerl  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     66  1.1  hpeyerl  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     67  1.1  hpeyerl  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     68  1.1  hpeyerl  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     69  1.1  hpeyerl  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     70  1.1  hpeyerl  * SUCH DAMAGE.
     71  1.1  hpeyerl  *
     72  1.2      cgd  * from: Utah $Hdr: cdvar.h 1.1 90/07/09$
     73  1.2      cgd  *
     74  1.3  hpeyerl  *	@(#)cdvar.h	8.1 (Berkeley) 6/10/93
     75  1.1  hpeyerl  */
     76  1.1  hpeyerl 
     77  1.5  thorpej /*
     78  1.5  thorpej  * Dynamic configuration and disklabel support by:
     79  1.5  thorpej  *	Jason R. Thorpe <thorpej (at) nas.nasa.gov>
     80  1.5  thorpej  *	Numerical Aerodynamic Simulation Facility
     81  1.5  thorpej  *	Mail Stop 258-6
     82  1.5  thorpej  *	NASA Ames Research Center
     83  1.5  thorpej  *	Moffett Field, CA 94035
     84  1.5  thorpej  */
     85  1.1  hpeyerl 
     86  1.1  hpeyerl /*
     87  1.5  thorpej  * A concatenated disk is described at initialization time by this structure.
     88  1.1  hpeyerl  */
     89  1.1  hpeyerl struct ccddevice {
     90  1.5  thorpej 	int		ccd_unit;	/* logical unit of this ccd */
     91  1.5  thorpej 	int		ccd_interleave;	/* interleave (DEV_BSIZE blocks) */
     92  1.5  thorpej 	int		ccd_flags;	/* misc. information */
     93  1.5  thorpej 	struct vnode	**ccd_vpp;	/* array of component vnodes */
     94  1.5  thorpej 	char		**ccd_cpp;	/* array of component pathnames */
     95  1.5  thorpej 	int		ccd_ndev;	/* number of component devices */
     96  1.5  thorpej };
     97  1.5  thorpej 
     98  1.5  thorpej /*
     99  1.5  thorpej  * This structure is used to configure a ccd via ioctl(2).
    100  1.5  thorpej  */
    101  1.5  thorpej struct ccd_ioctl {
    102  1.5  thorpej 	char	**ccio_disks;		/* pointer to component paths */
    103  1.5  thorpej 	int	ccio_ndisks;		/* number of disks to concatenate */
    104  1.5  thorpej 	int	ccio_ileave;		/* interleave (DEV_BSIZE blocks) */
    105  1.5  thorpej 	int	ccio_flags;		/* misc. information */
    106  1.5  thorpej 	int	ccio_unit;		/* unit number: use varies */
    107  1.5  thorpej 	size_t	ccio_size;		/* (returned) size of ccd */
    108  1.1  hpeyerl };
    109  1.1  hpeyerl 
    110  1.1  hpeyerl /* ccd_flags */
    111  1.3  hpeyerl #define	CCDF_SWAP	0x01	/* interleave should be dmmax */
    112  1.3  hpeyerl #define CCDF_UNIFORM	0x02	/* use LCCD of sizes for uniform interleave */
    113  1.1  hpeyerl 
    114  1.5  thorpej /* Mask of user-settable ccd flags. */
    115  1.5  thorpej #define CCDF_USERMASK	(CCDF_SWAP|CCDF_UNIFORM)
    116  1.5  thorpej 
    117  1.1  hpeyerl /*
    118  1.1  hpeyerl  * Component info table.
    119  1.1  hpeyerl  * Describes a single component of a concatenated disk.
    120  1.1  hpeyerl  */
    121  1.1  hpeyerl struct ccdcinfo {
    122  1.5  thorpej 	struct vnode	*ci_vp;			/* device's vnode */
    123  1.5  thorpej 	dev_t		ci_dev;			/* XXX: device's dev_t */
    124  1.5  thorpej 	size_t		ci_size; 		/* size */
    125  1.5  thorpej 	char		*ci_path;		/* path to component */
    126  1.5  thorpej 	size_t		ci_pathlen;		/* length of component path */
    127  1.1  hpeyerl };
    128  1.1  hpeyerl 
    129  1.1  hpeyerl /*
    130  1.1  hpeyerl  * Interleave description table.
    131  1.1  hpeyerl  * Computed at boot time to speed irregular-interleave lookups.
    132  1.1  hpeyerl  * The idea is that we interleave in "groups".  First we interleave
    133  1.1  hpeyerl  * evenly over all component disks up to the size of the smallest
    134  1.1  hpeyerl  * component (the first group), then we interleave evenly over all
    135  1.1  hpeyerl  * remaining disks up to the size of the next-smallest (second group),
    136  1.1  hpeyerl  * and so on.
    137  1.1  hpeyerl  *
    138  1.1  hpeyerl  * Each table entry describes the interleave characteristics of one
    139  1.1  hpeyerl  * of these groups.  For example if a concatenated disk consisted of
    140  1.1  hpeyerl  * three components of 5, 3, and 7 DEV_BSIZE blocks interleaved at
    141  1.1  hpeyerl  * DEV_BSIZE (1), the table would have three entries:
    142  1.1  hpeyerl  *
    143  1.1  hpeyerl  *	ndisk	startblk	startoff	dev
    144  1.1  hpeyerl  *	3	0		0		0, 1, 2
    145  1.1  hpeyerl  *	2	9		3		0, 2
    146  1.1  hpeyerl  *	1	13		5		2
    147  1.1  hpeyerl  *	0	-		-		-
    148  1.1  hpeyerl  *
    149  1.1  hpeyerl  * which says that the first nine blocks (0-8) are interleaved over
    150  1.1  hpeyerl  * 3 disks (0, 1, 2) starting at block offset 0 on any component disk,
    151  1.1  hpeyerl  * the next 4 blocks (9-12) are interleaved over 2 disks (0, 2) starting
    152  1.1  hpeyerl  * at component block 3, and the remaining blocks (13-14) are on disk
    153  1.1  hpeyerl  * 2 starting at offset 5.
    154  1.1  hpeyerl  */
    155  1.1  hpeyerl struct ccdiinfo {
    156  1.1  hpeyerl 	int	ii_ndisk;	/* # of disks range is interleaved over */
    157  1.1  hpeyerl 	daddr_t	ii_startblk;	/* starting scaled block # for range */
    158  1.1  hpeyerl 	daddr_t	ii_startoff;	/* starting component offset (block #) */
    159  1.8  thorpej 	int	*ii_index;	/* ordered list of components in range */
    160  1.1  hpeyerl };
    161  1.1  hpeyerl 
    162  1.5  thorpej /*
    163  1.5  thorpej  * Concatenated disk pseudo-geometry information.
    164  1.5  thorpej  */
    165  1.5  thorpej struct ccdgeom {
    166  1.5  thorpej 	u_int32_t	ccg_secsize;	/* # bytes per sector */
    167  1.5  thorpej 	u_int32_t	ccg_nsectors;	/* # data sectors per track */
    168  1.5  thorpej 	u_int32_t	ccg_ntracks;	/* # tracks per cylinder */
    169  1.5  thorpej 	u_int32_t	ccg_ncylinders;	/* # cylinders per unit */
    170  1.5  thorpej };
    171  1.5  thorpej 
    172  1.5  thorpej /*
    173  1.5  thorpej  * A concatenated disk is described after initialization by this structure.
    174  1.5  thorpej  */
    175  1.5  thorpej struct ccd_softc {
    176  1.5  thorpej 	int		 sc_unit;		/* logical unit number */
    177  1.5  thorpej 	int		 sc_flags;		/* flags */
    178  1.5  thorpej 	int		 sc_cflags;		/* configuration flags */
    179  1.5  thorpej 	size_t		 sc_size;		/* size of ccd */
    180  1.5  thorpej 	int		 sc_ileave;		/* interleave */
    181  1.5  thorpej 	int		 sc_nccdisks;		/* number of components */
    182  1.5  thorpej 	struct ccdcinfo	 *sc_cinfo;		/* component info */
    183  1.5  thorpej 	struct ccdiinfo	 *sc_itable;		/* interleave table */
    184  1.5  thorpej 	struct ccdgeom   sc_geom;		/* pseudo geometry info */
    185  1.9  thorpej 	char		 sc_xname[8];		/* XXX external name */
    186  1.9  thorpej 	struct disk	 sc_dkdev;		/* generic disk device info */
    187  1.5  thorpej };
    188  1.5  thorpej 
    189  1.5  thorpej /* sc_flags */
    190  1.5  thorpej #define CCDF_INITED	0x01	/* unit has been initialized */
    191  1.5  thorpej #define CCDF_WLABEL	0x02	/* label area is writable */
    192  1.5  thorpej #define CCDF_LABELLING	0x04	/* unit is currently being labelled */
    193  1.7  thorpej #define CCDF_WANTED	0x40	/* someone is waiting to obtain a lock */
    194  1.7  thorpej #define CCDF_LOCKED	0x80	/* unit is locked */
    195  1.5  thorpej 
    196  1.5  thorpej /*
    197  1.5  thorpej  * Before you can use a unit, it must be configured with CCDIOCSET.
    198  1.5  thorpej  * The configuration persists across opens and closes of the device;
    199  1.6  thorpej  * a CCDIOCCLR must be used to reset a configuration.  An attempt to
    200  1.5  thorpej  * CCDIOCSET an already active unit will return EBUSY.  Attempts to
    201  1.5  thorpej  * CCDIOCCLR an inactive unit will return ENXIO.
    202  1.5  thorpej  */
    203  1.5  thorpej #define CCDIOCSET	_IOWR('F', 16, struct ccd_ioctl)   /* enable ccd */
    204  1.5  thorpej #define CCDIOCCLR	_IOW('F', 17, struct ccd_ioctl)    /* disable ccd */
    205