diskslice.h

/*-
 * Copyright (c) 1994 Bruce D. Evans.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 * $FreeBSD: src/sys/sys/diskslice.h,v 1.36.2.1 2001/01/29 01:50:50 ken Exp $
 */

#ifndef _SYS_DISKSLICE_H_
#define _SYS_DISKSLICE_H_

#ifndef _KERNEL
#include <sys/types.h>
#endif
#include <sys/ioccom.h>

#define BASE_SLICE              2
#define COMPATIBILITY_SLICE     0
#define DIOCGSLICEINFO          _IOR('d', 111, struct diskslices)
#define DIOCSYNCSLICEINFO       _IOW('d', 112, int)
#define MAX_SLICES              32
#define WHOLE_DISK_SLICE        1

struct  diskslice {
        u_long  ds_offset;              /* starting sector */
        u_long  ds_size;                /* number of sectors */
        int     ds_type;                /* (foreign) slice type */
#ifdef PC98
        int     ds_subtype;             /* sub slice type */
        u_char  ds_name[16];            /* slice name */
#endif
        struct disklabel *ds_label;     /* BSD label, if any */
        void    *ds_dev;                /* devfs token for raw whole slice */
#ifdef MAXPARTITIONS                    /* XXX don't depend on disklabel.h */
#if MAXPARTITIONS !=    8               /* but check consistency if possible */
#error "inconsistent MAXPARTITIONS"
#endif
#else
#define MAXPARTITIONS   8
#endif
        void    *ds_devs[MAXPARTITIONS];        /* XXX s.b. in label */
        u_char  ds_openmask;            /* devs open */
        u_char  ds_wlabel;              /* nonzero if label is writable */
};

struct diskslices {
        struct cdevsw *dss_cdevsw;      /* for containing device */
        int     dss_first_bsd_slice;    /* COMPATIBILITY_SLICE is mapped here */
        u_int   dss_nslices;            /* actual dimension of dss_slices[] */
        u_int   dss_oflags;             /* copy of flags for "first" open */
        int     dss_secmult;            /* block to sector multiplier */
        int     dss_secshift;           /* block to sector shift (or -1) */
        int     dss_secsize;            /* sector size */
        struct diskslice
                dss_slices[MAX_SLICES]; /* actually usually less */
};

#ifdef _KERNEL

/* Flags for dsopen(). */
#define DSO_NOLABELS    1
#define DSO_ONESLICE    2
#define DSO_COMPATLABEL 4

#define dsgetlabel(dev, ssp)    (ssp->dss_slices[dkslice(dev)].ds_label)

struct buf;
struct disklabel;

int     dscheck __P((struct buf *bp, struct diskslices *ssp));
void    dsclose __P((dev_t dev, int mode, struct diskslices *ssp));
void    dsgone __P((struct diskslices **sspp));
int     dsinit __P((dev_t dev, struct disklabel *lp,
                     struct diskslices **sspp));
int     dsioctl __P((dev_t dev, u_long cmd, caddr_t data,
                     int flags, struct diskslices **sspp));
int     dsisopen __P((struct diskslices *ssp));
struct diskslices *dsmakeslicestruct __P((int nslices, struct disklabel *lp));
char    *dsname __P((dev_t dev, int unit, int slice, int part,
                     char *partname));
int     dsopen __P((dev_t dev, int mode, u_int flags,
                    struct diskslices **sspp, struct disklabel *lp));
int     dssize __P((dev_t dev, struct diskslices **sspp));

#endif /* _KERNEL */

#endif /* !_SYS_DISKSLICE_H_ */

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