linux-kernel - Re: [Drbd-dev] FLUSH/FUA documentation & code discrepancy

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Message-ID: <20120911144102.GE12039@redhat.com>
Date:	Tue, 11 Sep 2012 10:41:02 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Lars Ellenberg <lars.ellenberg@...bit.com>
Cc:	NeilBrown <neilb@...e.de>,
	Kent Overstreet <koverstreet@...gle.com>,
	Jens Axboe <axboe@...nel.dk>,
	Philipp Reisner <philipp.reisner@...bit.com>,
	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Christoph Hellwig <hch@....de>, drbd-dev@...ts.linbit.com
Subject: Re: [Drbd-dev] FLUSH/FUA documentation & code discrepancy

On Tue, Sep 11, 2012 at 10:25:01AM +0200, Lars Ellenberg wrote:

[..]
> "To enforce write-after-write dependencies, you *have* to drain the
> queue (do we have a generic interface available for that?),
> or at least wait for the completion of all the requests you
> (potentially) depend upon, before even submitting the dependent request.

I think you need to wait for all previous IOs (you are dependent on) to finish.

Thanks
Vivek
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