linux-kernel - Re: [PATCH 1/3] xen/blk[front|back]: Use the full FLUSH

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Message-ID: <20110910180849.GA6621@infradead.org>
Date:	Sat, 10 Sep 2011 14:08:49 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	JBeulich@...ell.com, jeremy.fitzhardinge@...rix.com,
	axboe@...nel.dk
Subject: Re: [PATCH 1/3] xen/blk[front|back]: Use the full FLUSH | FUA
 instead of just FLUSH.

On Fri, Sep 09, 2011 at 02:30:59PM -0400, Konrad Rzeszutek Wilk wrote:
> During a FLUSH we can pass sector number that we want to
> have flushed - which is what FUA requests are.

No, that is not the case.

REQ_FLUSH without data		-> pure flush
REQ_FLUSH with data		-> preflush plus write
REQ_FUA				-> write and ranged postflush

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