FreeBSD/Linux Kernel Cross Reference
sys/sys/diskslice.h
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 * $FreeBSD$
27 */
28
29 #ifndef _SYS_DISKSLICE_H_
30 #define _SYS_DISKSLICE_H_
31
32 #ifndef _KERNEL
33 #include <sys/types.h>
34 #endif
35 #include <sys/ioccom.h>
36
37 #define BASE_SLICE 2
38 #define COMPATIBILITY_SLICE 0
39 #define DIOCGSLICEINFO _IOR('d', 111, struct diskslices)
40 #define DIOCSYNCSLICEINFO _IOW('d', 112, int)
41 #define MAX_SLICES 32
42 #define WHOLE_DISK_SLICE 1
43
44 struct diskslice {
45 u_long ds_offset; /* starting sector */
46 u_long ds_size; /* number of sectors */
47 int ds_type; /* (foreign) slice type */
48 #ifdef PC98
49 int ds_subtype; /* sub slice type */
50 u_char ds_name[16]; /* slice name */
51 #endif
52 struct disklabel *ds_label; /* BSD label, if any */
53 void *ds_dev; /* devfs token for raw whole slice */
54 #ifdef MAXPARTITIONS /* XXX don't depend on disklabel.h */
55 #if MAXPARTITIONS != 8 /* but check consistency if possible */
56 #error "inconsistent MAXPARTITIONS"
57 #endif
58 #else
59 #define MAXPARTITIONS 8
60 #endif
61 void *ds_devs[MAXPARTITIONS]; /* XXX s.b. in label */
62 u_char ds_openmask; /* devs open */
63 u_char ds_wlabel; /* nonzero if label is writable */
64 };
65
66 struct diskslices {
67 struct cdevsw *dss_cdevsw; /* for containing device */
68 int dss_first_bsd_slice; /* COMPATIBILITY_SLICE is mapped here */
69 u_int dss_nslices; /* actual dimension of dss_slices[] */
70 u_int dss_oflags; /* copy of flags for "first" open */
71 int dss_secmult; /* block to sector multiplier */
72 int dss_secshift; /* block to sector shift (or -1) */
73 int dss_secsize; /* sector size */
74 struct diskslice
75 dss_slices[MAX_SLICES]; /* actually usually less */
76 };
77
78 #ifdef _KERNEL
79
80 /* Flags for dsopen(). */
81 #define DSO_NOLABELS 1
82 #define DSO_ONESLICE 2
83 #define DSO_COMPATLABEL 4
84
85 #define dsgetlabel(dev, ssp) (ssp->dss_slices[dkslice(dev)].ds_label)
86
87 struct buf;
88 struct disklabel;
89
90 int dscheck __P((struct buf *bp, struct diskslices *ssp));
91 void dsclose __P((dev_t dev, int mode, struct diskslices *ssp));
92 void dsgone __P((struct diskslices **sspp));
93 int dsinit __P((dev_t dev, struct disklabel *lp,
94 struct diskslices **sspp));
95 int dsioctl __P((dev_t dev, u_long cmd, caddr_t data,
96 int flags, struct diskslices **sspp));
97 int dsisopen __P((struct diskslices *ssp));
98 struct diskslices *dsmakeslicestruct __P((int nslices, struct disklabel *lp));
99 char *dsname __P((dev_t dev, int unit, int slice, int part,
100 char *partname));
101 int dsopen __P((dev_t dev, int mode, u_int flags,
102 struct diskslices **sspp, struct disklabel *lp));
103 int dssize __P((dev_t dev, struct diskslices **sspp));
104
105 #endif /* _KERNEL */
106
107 #endif /* !_SYS_DISKSLICE_H_ */
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