linux-kernel - Re: [PATCH 3/3] block: reimplement FLUSH/FUA to support merge

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Message-ID: <20110123103133.GC23121@htj.dyndns.org>
Date:	Sun, 23 Jan 2011 11:31:33 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Mike Snitzer <snitzer@...hat.com>
Cc:	axboe@...nel.dk, tytso@....edu, djwong@...ibm.com, shli@...nel.org,
	neilb@...e.de, adilger.kernel@...ger.ca, jack@...e.cz,
	linux-kernel@...r.kernel.org, kmannth@...ibm.com, cmm@...ibm.com,
	linux-ext4@...r.kernel.org, rwheeler@...hat.com, hch@....de,
	josef@...hat.com
Subject: Re: [PATCH 3/3] block: reimplement FLUSH/FUA to support merge

On Fri, Jan 21, 2011 at 07:49:55PM -0500, Mike Snitzer wrote:
> > + * If the device doesn't have writeback cache, FLUSH and FUA don't make any
> > + * difference.  The requests are either completed immediately if there's no
> > + * data or executed as normal requests otherwise.
> 
> For devices without a writeback cache, I'm not seeing where pure flushes
> are completed immediately.  But I do see where data is processed
> directly in blk_insert_flush().

Yeah, it does.  Pure flushes on a device w/o writeback cache, @policy
is zero and blk_flush_complete_seq() will directly proceed to
REQ_FSEQ_DONE.

> > -struct request *blk_do_flush(struct request_queue *q, struct request *rq)
> > +/**
> > + * blk_abort_flush - @q is being aborted, abort flush requests
>       ^^^^^^^^^^^^^^^ 
> Small comment nit, s/blk_abort_flush/blk_abort_flushes/

Thanks.

-- 
tejun
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