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SubjectRe: [PATCH 8/8] libata: implement on-demand HPA unlocking
From: Tejun Heo <>
Date: Sat, 15 May 2010 20:09:34 +0200

> 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 <>
> Suggested-by: Ben Hutchings <>

Acked-by: David S. Miller <>

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