1 /* $OpenBSD: disk.h,v 1.17 2007/06/20 18:15:47 deraadt Exp $ */
2 /* $NetBSD: disk.h,v 1.11 1996/04/28 20:22:50 thorpej Exp $ */
3
4 /*
5 * Copyright (c) 1995 Jason R. Thorpe. All rights reserved.
6 * Copyright (c) 1992, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * This software was developed by the Computer Systems Engineering group
10 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
11 * contributed to Berkeley.
12 *
13 * All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Lawrence Berkeley Laboratory.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 * 1. Redistributions of source code must retain the above copyright
22 * notice, this list of conditions and the following disclaimer.
23 * 2. Redistributions in binary form must reproduce the above copyright
24 * notice, this list of conditions and the following disclaimer in the
25 * documentation and/or other materials provided with the distribution.
26 * 3. 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 * from: Header: disk.h,v 1.5 92/11/19 04:33:03 torek Exp (LBL)
43 *
44 * @(#)disk.h 8.1 (Berkeley) 6/2/93
45 */
46
47 /*
48 * Disk device structures.
49 */
50
51 #include <sys/time.h>
52 #include <sys/queue.h>
53 #include <sys/rwlock.h>
54
55 struct buf;
56 struct disklabel;
57
58 #define DS_DISKNAMELEN 16
59
60 struct diskstats {
61 char ds_name[DS_DISKNAMELEN];
62 int ds_busy; /* busy counter */
63 u_int64_t ds_rxfer; /* total number of read transfers */
64 u_int64_t ds_wxfer; /* total number of write transfers */
65 u_int64_t ds_seek; /* total independent seek operations */
66 u_int64_t ds_rbytes; /* total bytes read */
67 u_int64_t ds_wbytes; /* total bytes written */
68 struct timeval ds_attachtime; /* time disk was attached */
69 struct timeval ds_timestamp; /* timestamp of last unbusy */
70 struct timeval ds_time; /* total time spent busy */
71 };
72
73 struct disk {
74 TAILQ_ENTRY(disk) dk_link; /* link in global disklist */
75 struct rwlock dk_lock; /* disk lock */
76 char *dk_name; /* disk name */
77 int dk_flags; /* disk flags */
78 #define DKF_CONSTRUCTED 0x0001
79
80 /*
81 * Metrics data; note that some metrics may have no meaning
82 * on certain types of disks.
83 */
84 int dk_busy; /* busy counter */
85 u_int64_t dk_rxfer; /* total number of read transfers */
86 u_int64_t dk_wxfer; /* total number of write transfers */
87 u_int64_t dk_seek; /* total independent seek operations */
88 u_int64_t dk_rbytes; /* total bytes read */
89 u_int64_t dk_wbytes; /* total bytes written */
90 struct timeval dk_attachtime; /* time disk was attached */
91 struct timeval dk_timestamp; /* timestamp of last unbusy */
92 struct timeval dk_time; /* total time spent busy */
93
94 int dk_bopenmask; /* block devices open */
95 int dk_copenmask; /* character devices open */
96 int dk_openmask; /* composite (bopen|copen) */
97 int dk_state; /* label state ### */
98 int dk_blkshift; /* shift to convert DEV_BSIZE to blks*/
99 int dk_byteshift; /* shift to convert bytes to blks */
100
101 struct dkdriver *dk_driver; /* pointer to driver */
102
103 /*
104 * Disk label information. Storage for the in-core disk label
105 * must be dynamically allocated, otherwise the size of this
106 * structure becomes machine-dependent.
107 */
108 daddr64_t dk_labelsector; /* sector containing label */
109 struct disklabel *dk_label; /* label */
110 };
111
112 struct dkdriver {
113 void (*d_strategy)(struct buf *);
114 #ifdef notyet
115 int (*d_open)(dev_t dev, int ifmt, int, struct proc *);
116 int (*d_close)(dev_t dev, int, int ifmt, struct proc *);
117 int (*d_ioctl)(dev_t dev, u_long cmd, caddr_t data, int fflag,
118 struct proc *);
119 int (*d_dump)(dev_t);
120 void (*d_start)(struct buf *, daddr64_t);
121 int (*d_mklabel)(struct disk *);
122 #endif
123 };
124
125 /* states */
126 #define DK_CLOSED 0 /* drive is closed */
127 #define DK_WANTOPEN 1 /* drive being opened */
128 #define DK_WANTOPENRAW 2 /* drive being opened */
129 #define DK_RDLABEL 3 /* label being read */
130 #define DK_OPEN 4 /* label read, drive open */
131 #define DK_OPENRAW 5 /* open without label */
132
133 #ifdef DISKSORT_STATS
134 /*
135 * Stats from disksort().
136 */
137 struct disksort_stats {
138 long ds_newhead; /* # new queue heads created */
139 long ds_newtail; /* # new queue tails created */
140 long ds_midfirst; /* # insertions into sort list */
141 long ds_endfirst; /* # insertions at end of sort list */
142 long ds_newsecond; /* # inversions (2nd lists) created */
143 long ds_midsecond; /* # insertions into 2nd list */
144 long ds_endsecond; /* # insertions at end of 2nd list */
145 };
146 #endif
147
148 /*
149 * disklist_head is defined here so that user-land has access to it.
150 */
151 TAILQ_HEAD(disklist_head, disk); /* the disklist is a TAILQ */
152
153 #ifdef _KERNEL
154 extern int disk_count; /* number of disks in global disklist */
155 extern int disk_change; /* disk attached/detached */
156
157 void disk_init(void);
158 int disk_construct(struct disk *, char *);
159 void disk_attach(struct disk *);
160 void disk_detach(struct disk *);
161 void disk_busy(struct disk *);
162 void disk_unbusy(struct disk *, long, int);
163
164 int disk_lock(struct disk *);
165 void disk_unlock(struct disk *);
166 #endif