FreeBSD/Linux Kernel Cross Reference
sys/sys/disk.h
1 /*-
2 * ----------------------------------------------------------------------------
3 * "THE BEER-WARE LICENSE" (Revision 42):
4 * <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
5 * can do whatever you want with this stuff. If we meet some day, and you think
6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
7 * ----------------------------------------------------------------------------
8 *
9 * $FreeBSD: releng/11.0/sys/sys/disk.h 300207 2016-05-19 14:08:36Z ken $
10 *
11 */
12
13 #ifndef _SYS_DISK_H_
14 #define _SYS_DISK_H_
15
16 #include <sys/ioccom.h>
17 #include <sys/types.h>
18 #include <sys/disk_zone.h>
19
20 #ifdef _KERNEL
21
22 #ifndef _SYS_CONF_H_
23 #include <sys/conf.h> /* XXX: temporary to avoid breakage */
24 #endif
25
26 void disk_err(struct bio *bp, const char *what, int blkdone, int nl);
27
28 #endif
29
30 #define DIOCGSECTORSIZE _IOR('d', 128, u_int)
31 /*
32 * Get the sector size of the device in bytes. The sector size is the
33 * smallest unit of data which can be transferred from this device.
34 * Usually this is a power of 2 but it might not be (i.e. CDROM audio).
35 */
36
37 #define DIOCGMEDIASIZE _IOR('d', 129, off_t) /* Get media size in bytes */
38 /*
39 * Get the size of the entire device in bytes. This should be a
40 * multiple of the sector size.
41 */
42
43 #define DIOCGFWSECTORS _IOR('d', 130, u_int) /* Get firmware's sectorcount */
44 /*
45 * Get the firmware's notion of number of sectors per track. This
46 * value is mostly used for compatibility with various ill designed
47 * disk label formats. Don't use it unless you have to.
48 */
49
50 #define DIOCGFWHEADS _IOR('d', 131, u_int) /* Get firmware's headcount */
51 /*
52 * Get the firmwares notion of number of heads per cylinder. This
53 * value is mostly used for compatibility with various ill designed
54 * disk label formats. Don't use it unless you have to.
55 */
56
57 #define DIOCSKERNELDUMP _IOW('d', 133, u_int) /* Set/Clear kernel dumps */
58 /*
59 * Enable/Disable (the argument is boolean) the device for kernel
60 * core dumps.
61 */
62
63 #define DIOCGFRONTSTUFF _IOR('d', 134, off_t)
64 /*
65 * Many disk formats have some amount of space reserved at the
66 * start of the disk to hold bootblocks, various disklabels and
67 * similar stuff. This ioctl returns the number of such bytes
68 * which may apply to the device.
69 */
70
71 #define DIOCGFLUSH _IO('d', 135) /* Flush write cache */
72 /*
73 * Flush write cache of the device.
74 */
75
76 #define DIOCGDELETE _IOW('d', 136, off_t[2]) /* Delete data */
77 /*
78 * Mark data on the device as unused.
79 */
80
81 #define DISK_IDENT_SIZE 256
82 #define DIOCGIDENT _IOR('d', 137, char[DISK_IDENT_SIZE])
83 /*-
84 * Get the ident of the given provider. Ident is (most of the time)
85 * a uniqe and fixed provider's identifier. Ident's properties are as
86 * follow:
87 * - ident value is preserved between reboots,
88 * - provider can be detached/attached and ident is preserved,
89 * - provider's name can change - ident can't,
90 * - ident value should not be based on on-disk metadata; in other
91 * words copying whole data from one disk to another should not
92 * yield the same ident for the other disk,
93 * - there could be more than one provider with the same ident, but
94 * only if they point at exactly the same physical storage, this is
95 * the case for multipathing for example,
96 * - GEOM classes that consumes single providers and provide single
97 * providers, like geli, gbde, should just attach class name to the
98 * ident of the underlying provider,
99 * - ident is an ASCII string (is printable),
100 * - ident is optional and applications can't relay on its presence.
101 */
102
103 #define DIOCGPROVIDERNAME _IOR('d', 138, char[MAXPATHLEN])
104 /*
105 * Store the provider name, given a device path, in a buffer. The buffer
106 * must be at least MAXPATHLEN bytes long.
107 */
108
109 #define DIOCGSTRIPESIZE _IOR('d', 139, off_t) /* Get stripe size in bytes */
110 /*
111 * Get the size of the device's optimal access block in bytes.
112 * This should be a multiple of the sector size.
113 */
114
115 #define DIOCGSTRIPEOFFSET _IOR('d', 140, off_t) /* Get stripe offset in bytes */
116 /*
117 * Get the offset of the first device's optimal access block in bytes.
118 * This should be a multiple of the sector size.
119 */
120
121 #define DIOCGPHYSPATH _IOR('d', 141, char[MAXPATHLEN])
122 /*
123 * Get a string defining the physical path for a given provider.
124 * This has similar rules to ident, but is intended to uniquely
125 * identify the physical location of the device, not the current
126 * occupant of that location.
127 */
128
129 struct diocgattr_arg {
130 char name[64];
131 int len;
132 union {
133 char str[DISK_IDENT_SIZE];
134 off_t off;
135 int i;
136 } value;
137 };
138 #define DIOCGATTR _IOWR('d', 142, struct diocgattr_arg)
139
140 #define DIOCZONECMD _IOWR('d', 143, struct disk_zone_args)
141
142 #endif /* _SYS_DISK_H_ */
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