linux-kernel - Re: [RFC] enable FUA support in libata

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Date:	Fri, 13 Apr 2012 10:18:32 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: Re: [RFC] enable FUA support in libata

On 04/13/2012 04:11 AM, Zheng Liu wrote:
> Hi Jeff and list,
>
> Recently I met a problem about FUA support of SATA disk.  In my machine,
> it has a SATA disk that supports FUA feature.  But after system starts
> up, it displays that the disk cannot support FUA from dmesg.
>
> I notice this commit (c3c013a2).  It disables FUA support in all of SATA
> disk.  But the commit log is too simple to know why we should disable
> FUA support in libata.  Could you please explain it?  Thank you.

FUA support in the block layer wanted speed and guarantees that early 
FUA drives were simply not providing.



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