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Describe the generic disk ioctls in some detail.

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Sponsored by: DARPA & NAI Labs
This commit is contained in:
Poul-Henning Kamp 2002-04-09 15:09:54 +00:00
parent 85b16a0d1a
commit e2a685488d
1 changed files with 32 additions and 5 deletions
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37
sys/sys/disk.h
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@ -47,10 +47,37 @@ void disk_invalidate(struct disk *disk);
#endif
#define DIOCGSECTORSIZE _IOR('d', 128, u_int) /* Get sector size in bytes */
#define DIOCGMEDIASIZE _IOR('d', 129, off_t) /* Get media size in bytes */
#define DIOCGFWSECTORS _IOR('d', 130, u_int) /* Get firmware sectorcount */
#define DIOCGFWHEADS _IOR('d', 131, u_int) /* Get firmware headcount */
#define DIOCSKERNELDUMP _IOW('d', 133, u_int) /* Set/Clear kernel dumps */
#define DIOCGSECTORSIZE _IOR('d', 128, u_int)
/*-
* Get the sectorsize of the device in bytes. The sectorsize is the
* smallest unit of data which can be transfered from this device.
* Usually this is a power of two but it may not be. (ie: CDROM audio)
*/
#define DIOCGMEDIASIZE _IOR('d', 129, off_t) /* Get media size in bytes */
/*-
* Get the size of the entire device in bytes. This should be a
* multiple of the sectorsize.
*/
#define DIOCGFWSECTORS _IOR('d', 130, u_int) /* Get firmware sectorcount */
/*-
* Get the firmwares notion of number of sectors per track. This
* value is mostly used for compatibility with various ill designed
* disk label formats. Don't use it unless you have to.
*/
#define DIOCGFWHEADS _IOR('d', 131, u_int) /* Get firmware headcount */
/*-
* Get the firmwares notion of number of heads per cylinder. This
* value is mostly used for compatibility with various ill designed
* disk label formats. Don't use it unless you have to.
*/
#define DIOCSKERNELDUMP _IOW('d', 133, u_int) /* Set/Clear kernel dumps */
/*-
* Enable/Disable (the argument is boolean) the device for kernel
* core dumps.
*/
#endif /* _SYS_DISK_H_ */