From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: [RFC] enable FUA support in libata Date: Fri, 13 Apr 2012 10:18:32 -0400 Message-ID: <4F8835B8.2060400@garzik.org> References: <20120413081104.GA4953@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20120413081104.GA4953@gmail.com> Sender: linux-ide-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org List-Id: linux-scsi@vger.kernel.org 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.