Change the kernel dev_t, representing a pointer to a specinfo structure,
[dragonfly.git] / sys / sys / diskslice.h
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1/*-
2 * Copyright (c) 1994 Bruce D. Evans.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/sys/sys/diskslice.h,v 1.36.2.1 2001/01/29 01:50:50 ken Exp $
b13267a5 27 * $DragonFly: src/sys/sys/diskslice.h,v 1.8 2006/09/10 01:26:40 dillon Exp $
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28 */
29
30#ifndef _SYS_DISKSLICE_H_
31#define _SYS_DISKSLICE_H_
32
1bd40720 33#ifndef _SYS_TYPES_H_
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34#include <sys/types.h>
35#endif
1bd40720 36#ifndef _SYS_IOCCOM_H_
984263bc 37#include <sys/ioccom.h>
1bd40720 38#endif
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39
40#define BASE_SLICE 2
41#define COMPATIBILITY_SLICE 0
42#define DIOCGSLICEINFO _IOR('d', 111, struct diskslices)
43#define DIOCSYNCSLICEINFO _IOW('d', 112, int)
9e792b7e 44#define MAX_SLICES 16
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45#define WHOLE_DISK_SLICE 1
46
47struct diskslice {
48 u_long ds_offset; /* starting sector */
49 u_long ds_size; /* number of sectors */
50 int ds_type; /* (foreign) slice type */
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51 struct disklabel *ds_label; /* BSD label, if any */
52 void *ds_dev; /* devfs token for raw whole slice */
53#ifdef MAXPARTITIONS /* XXX don't depend on disklabel.h */
9e792b7e 54#if MAXPARTITIONS != 16 /* but check consistency if possible */
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55#error "inconsistent MAXPARTITIONS"
56#endif
57#else
9e792b7e 58#define MAXPARTITIONS 16
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59#endif
60 void *ds_devs[MAXPARTITIONS]; /* XXX s.b. in label */
61 u_char ds_openmask; /* devs open */
62 u_char ds_wlabel; /* nonzero if label is writable */
63};
64
65struct diskslices {
66 struct cdevsw *dss_cdevsw; /* for containing device */
67 int dss_first_bsd_slice; /* COMPATIBILITY_SLICE is mapped here */
68 u_int dss_nslices; /* actual dimension of dss_slices[] */
69 u_int dss_oflags; /* copy of flags for "first" open */
70 int dss_secmult; /* block to sector multiplier */
71 int dss_secshift; /* block to sector shift (or -1) */
72 int dss_secsize; /* sector size */
73 struct diskslice
74 dss_slices[MAX_SLICES]; /* actually usually less */
75};
76
77#ifdef _KERNEL
78
79/* Flags for dsopen(). */
80#define DSO_NOLABELS 1
81#define DSO_ONESLICE 2
82#define DSO_COMPATLABEL 4
83
84#define dsgetlabel(dev, ssp) (ssp->dss_slices[dkslice(dev)].ds_label)
85
86struct buf;
81b5c339 87struct bio;
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88struct disklabel;
89
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90struct bio *dscheck (cdev_t dev, struct bio *bio, struct diskslices *ssp);
91void dsclose (cdev_t dev, int mode, struct diskslices *ssp);
b153f746 92void dsgone (struct diskslices **sspp);
b13267a5 93int dsinit (cdev_t dev, struct disklabel *lp,
b153f746 94 struct diskslices **sspp);
b13267a5 95int dsioctl (cdev_t dev, u_long cmd, caddr_t data,
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96 int flags, struct diskslices **sspp);
97int dsisopen (struct diskslices *ssp);
98struct diskslices *dsmakeslicestruct (int nslices, struct disklabel *lp);
b13267a5 99char *dsname (cdev_t dev, int unit, int slice, int part,
b153f746 100 char *partname);
b13267a5 101int dsopen (cdev_t dev, int mode, u_int flags,
b153f746 102 struct diskslices **sspp, struct disklabel *lp);
b13267a5 103int dssize (cdev_t dev, struct diskslices **sspp);
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104
105#endif /* _KERNEL */
106
107#endif /* !_SYS_DISKSLICE_H_ */