Re: [RFC][PATCH] libata: enable SATA disk fua detection on default

From: Jeff Garzik
Date: Sun Sep 09 2012 - 16:39:05 EST

On 09/09/2012 04:34 PM, Arvydas Sidorenko wrote:
Meanwhile there already has a number of SATA disks that have supported
this feature. So I think maybe we can enable it.


Blindly enabling FUA by default in my opinion is not a good idea at all.
I believe the focus should be on detecting FUA support on the device
instead, which the kernel at this point cannot reliably do (is it possible?).

Premature assumptions. It is entirely possible that FUA is detected accurately, but the software is missing a flush somewhere that FUA requires, if disks are to be used in FUA mode.

The filesystem and the block layer must properly generate and order their I/Os based on the FUA enablement bits that appear in the block layer after libata discovers the SATA FUA feature.


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