FreeBSD/Linux Kernel Cross Reference
sys/sys/disk.h
1 /* $OpenBSD: disk.h,v 1.37 2022/09/11 19:34:40 miod 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/device.h>
52 #include <sys/time.h>
53 #include <sys/queue.h>
54 #include <sys/rwlock.h>
55 #include <sys/mutex.h>
56
57 struct buf;
58 struct disklabel;
59
60 #define DS_DISKNAMELEN 16
61
62 struct diskstats {
63 char ds_name[DS_DISKNAMELEN];
64 int ds_busy; /* busy counter */
65 u_int64_t ds_rxfer; /* total number of read transfers */
66 u_int64_t ds_wxfer; /* total number of write transfers */
67 u_int64_t ds_seek; /* total independent seek operations */
68 u_int64_t ds_rbytes; /* total bytes read */
69 u_int64_t ds_wbytes; /* total bytes written */
70 struct timeval ds_attachtime; /* time disk was attached */
71 struct timeval ds_timestamp; /* time of first busy or any unbusy */
72 struct timeval ds_time; /* total time spent busy */
73 };
74
75 struct disk {
76 TAILQ_ENTRY(disk) dk_link; /* link in global disklist */
77 struct rwlock dk_lock; /* disk lock */
78 struct mutex dk_mtx; /* busy/unbusy mtx */
79 char *dk_name; /* disk name */
80 struct device *dk_device; /* disk device structure. */
81 dev_t dk_devno; /* disk device number. */
82 int dk_flags; /* disk flags */
83 #define DKF_CONSTRUCTED 0x0001
84 #define DKF_OPENED 0x0002
85 #define DKF_NOLABELREAD 0x0004
86
87 /*
88 * Metrics data; note that some metrics may have no meaning
89 * on certain types of disks.
90 */
91 int dk_busy; /* busy counter */
92 u_int64_t dk_rxfer; /* total number of read transfers */
93 u_int64_t dk_wxfer; /* total number of write transfers */
94 u_int64_t dk_seek; /* total independent seek operations */
95 u_int64_t dk_rbytes; /* total bytes read */
96 u_int64_t dk_wbytes; /* total bytes written */
97 struct timeval dk_attachtime; /* time disk was attached */
98 struct timeval dk_timestamp; /* time of first busy or any unbusy */
99 struct timeval dk_time; /* total time spent busy */
100
101 int dk_bopenmask; /* block devices open */
102 int dk_copenmask; /* character devices open */
103 int dk_openmask; /* composite (bopen|copen) */
104 int dk_state; /* label state ### */
105 int dk_blkshift; /* shift to convert DEV_BSIZE to blks*/
106 int dk_byteshift; /* shift to convert bytes to blks */
107
108 /*
109 * Disk label information. Storage for the in-core disk label
110 * must be dynamically allocated, otherwise the size of this
111 * structure becomes machine-dependent.
112 */
113 struct disklabel *dk_label;
114 };
115
116 /* states */
117 #define DK_CLOSED 0 /* drive is closed */
118 #define DK_WANTOPEN 1 /* drive being opened */
119 #define DK_WANTOPENRAW 2 /* drive being opened */
120 #define DK_RDLABEL 3 /* label being read */
121 #define DK_OPEN 4 /* label read, drive open */
122 #define DK_OPENRAW 5 /* open without label */
123
124 /* Disk map flags. */
125 #define DM_OPENPART 0x1 /* Open raw partition. */
126 #define DM_OPENBLCK 0x2 /* Open block device. */
127
128 /*
129 * disklist_head is defined here so that user-land has access to it.
130 */
131 TAILQ_HEAD(disklist_head, disk); /* the disklist is a TAILQ */
132
133 #ifdef _KERNEL
134 extern struct disklist_head disklist; /* list of disks attached to system */
135 extern int disk_count; /* number of disks in global disklist */
136 extern int disk_change; /* disk attached/detached */
137
138 void disk_init(void);
139 int disk_construct(struct disk *);
140 void disk_attach(struct device *, struct disk *);
141 void disk_detach(struct disk *);
142 int disk_openpart(struct disk *, int, int, int);
143 void disk_closepart(struct disk *, int, int);
144 void disk_gone(int (*)(dev_t, int, int, struct proc *), int);
145 void disk_busy(struct disk *);
146 void disk_unbusy(struct disk *, long, daddr_t, int);
147
148 int disk_lock(struct disk *);
149 void disk_lock_nointr(struct disk *);
150 void disk_unlock(struct disk *);
151 struct device *disk_lookup(struct cfdriver *, int);
152
153 char *disk_readlabel(struct disklabel *, dev_t, char *, size_t);
154
155 int disk_map(char *, char *, int, int);
156
157 int duid_iszero(u_char *);
158 const char *duid_format(u_char *);
159 #endif
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