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

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Message-ID: <20120509132317.GA24014@infradead.org>
Date:	Wed, 9 May 2012 09:23:17 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Christoph Hellwig <hch@...radead.org>,
	Robert Hancock <hancockrwd@...il.com>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, Jeff Garzik <jeff@...zik.org>,
	Zheng Liu <wenqing.lz@...bao.com>
Subject: Re: [RFC][PATCH] libata: enable SATA disk fua detection on default

On Wed, May 09, 2012 at 08:48:04PM +0800, Zheng Liu wrote:
> Thanks for your explanation.  It seems that there still has a problem.
> If I set the disk to write through mode, I need to modify my application
> to remove all of flush/sync operations.  It is unacceptable for us.

You don't have to - the kernel will not send a SYNCHRONIZE CACHE command
unless the disk advertises a write back cache.

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