tree f930703c8e3ba66cadcaf712ee7ce9b36a6d0823
parent 68939ce5fc17ee9c03ef6e543d4f82bd9f5583d4
author Tejun Heo <tj@kernel.org> 1273946974 +0200
committer Jeff Garzik <jgarzik@redhat.com> 1275501010 -0400

libata: implement on-demand HPA unlocking

Implement ata_scsi_unlock_native_capacity() which will be called
through SCSI layer when block layer notices that partitions on a
device extend beyond the end of the device.  It requests EH to unlock
HPA, waits for completion and returns the current device capacity.

This allows libata to unlock HPA on demand instead of having to decide
whether to unlock upfront.  Unlocking on demand is safer than
unlocking by upfront because some BIOSes write private data to the
area beyond HPA limit.  This was suggested by Ben Hutchings.

Signed-off-by: Tejun Heo <tj@kernel.org>
Suggested-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>