FreeBSD/Linux Kernel Cross Reference
sys/sys/disk.h
1 /*
2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This software was developed by the Computer Systems Engineering group
6 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
7 * contributed to Berkeley.
8 *
9 * All advertising materials mentioning features or use of this software
10 * must display the following acknowledgement:
11 * This product includes software developed by the University of
12 * California, Lawrence Berkeley Laboratory.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. All advertising materials mentioning features or use of this software
23 * must display the following acknowledgement:
24 * This product includes software developed by the University of
25 * California, Berkeley and its contributors.
26 * 4. Neither the name of the University nor the names of its contributors
27 * may be used to endorse or promote products derived from this software
28 * without specific prior written permission.
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * SUCH DAMAGE.
41 *
42 * @(#)disk.h 8.1 (Berkeley) 6/2/93
43 *
44 * $FreeBSD$
45 */
46
47 #ifndef _SYS_DISK_H_
48 #define _SYS_DISK_H_
49
50 /*
51 * Disk device structures.
52 *
53 * Note that this is only a preliminary outline. The final disk structures
54 * may be somewhat different.
55 */
56 struct buf;
57
58 struct dkdevice {
59 struct device dk_dev; /* base device */
60 struct dkdevice *dk_next; /* list of disks; not yet used */
61 int dk_bps; /* xfer rate: bytes per second */
62 int dk_bopenmask; /* block devices open */
63 int dk_copenmask; /* character devices open */
64 int dk_openmask; /* composite (bopen|copen) */
65 int dk_state; /* label state ### */
66 int dk_blkshift; /* shift to convert DEV_BSIZE to blks */
67 int dk_byteshift; /* shift to convert bytes to blks */
68 struct dkdriver *dk_driver; /* pointer to driver */
69 daddr_t dk_labelsector; /* sector containing label */
70 struct disklabel dk_label; /* label */
71 };
72
73 struct dkdriver {
74 void (*d_strategy) __P((struct buf *));
75 #ifdef notyet
76 int (*d_open) __P((dev_t dev, int ifmt, int, struct proc *));
77 int (*d_close) __P((dev_t dev, int, int ifmt, struct proc *));
78 int (*d_ioctl) __P((dev_t dev, int cmd, caddr_t data, int fflag,
79 struct proc *));
80 int (*d_dump) __P((dev_t));
81 void (*d_start) __P((struct buf *, daddr_t));
82 int (*d_mklabel) __P((struct dkdevice *));
83 #endif
84 };
85
86 /* states */
87 #define DK_CLOSED 0 /* drive is closed */
88 #define DK_WANTOPEN 1 /* drive being opened */
89 #define DK_WANTOPENRAW 2 /* drive being opened */
90 #define DK_RDLABEL 3 /* label being read */
91 #define DK_OPEN 4 /* label read, drive open */
92 #define DK_OPENRAW 5 /* open without label */
93
94 #ifdef DISKSORT_STATS
95 /*
96 * Stats from disksort().
97 */
98 struct disksort_stats {
99 long ds_newhead; /* # new queue heads created */
100 long ds_newtail; /* # new queue tails created */
101 long ds_midfirst; /* # insertions into sort list */
102 long ds_endfirst; /* # insertions at end of sort list */
103 long ds_newsecond; /* # inversions (2nd lists) created */
104 long ds_midsecond; /* # insertions into 2nd list */
105 long ds_endsecond; /* # insertions at end of 2nd list */
106 };
107 #endif
108
109 #ifdef KERNEL
110 void bufqdisksort __P((struct buf_queue_head *, struct buf *));
111 char *readdisklabel __P((struct dkdevice *, int));
112 int setdisklabel __P((struct dkdevice *, struct disklabel *));
113 int writedisklabel __P((struct dkdevice *, int));
114 int diskerr __P((struct dkdevice *, struct buf *, char *, int, int));
115 #endif
116
117 #endif
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