[Xen-devel] Re: [PATCH 1/3] xen/blk[front|back]: Use the full FLUSH | FUA instead of just FLUSH.

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

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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