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DISKMAP(4)	       FreeBSD Kernel Interfaces Manual		    DISKMAP(4)

NAME
     diskmap --	disklabel UID mapping interface

SYNOPSIS
     #include <sys/dkio.h>

DESCRIPTION
     The diskmap driver	provides userland applications with a means to map a
     disklabel UID to an actual	device and open	that device in one atomic op-
     eration.  This is achieved	via the	DIOCMAP	ioctl(2) command.

     The ability to use	a disklabel UID	is helpful in situations where a disk
     may appear	to the operating system	under different	device names.  For ex-
     ample, plugging USB keys into differently configured systems (think sd0
     or	sd1), or swapping between IDE and AHCI on a disk controller (wd0 or
     sd0).  Although the device	names may change, the operating	system is
     still able	to identify the	disk by	its UID.

FILES
     /dev/diskmap  diskmap device

SEE ALSO
     ioctl(2), disklabel(8)

HISTORY
     The diskmap driver	first appeared in OpenBSD 4.8.

AUTHORS
     The diskmap driver	was written by Joel Sing.

FreeBSD	13.0		      September	10, 2015		  FreeBSD 13.0

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO | HISTORY | AUTHORS

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