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Merge up to 2.6.22-rc4
Merge of 2.6.x-xfs-melb:linux:28871a by kenmcd.

Generic Block Device Capability
===============================================================================
This file documents the sysfs file block/<disk>/capability

capability is a hex word indicating which capabilities a specific disk
supports.  For more information on bits not listed here, see
include/linux/genhd.h

Capability				Value
-------------------------------------------------------------------------------
GENHD_FL_MEDIA_CHANGE_NOTIFY		4
	When this bit is set, the disk supports Asynchronous Notification
	of media change events.  These events will be broadcast to user
	space via kernel uevent.