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From: Tejun Heo <tj@kernel.org>
To: NeilBrown <neilb@suse.de>,
	Kent Overstreet <koverstreet@google.com>,
	Jens Axboe <axboe@kernel.dk>,
	Philipp Reisner <philipp.reisner@linbit.com>,
	linux-kernel@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
	Vivek Goyal <vgoyal@redhat.com>,
	drbd-dev@lists.linbit.com
Subject: Re: [Drbd-dev] FLUSH/FUA documentation & code discrepancy
Date: Wed, 12 Sep 2012 11:58:24 -0700	[thread overview]
Message-ID: <20120912185824.GS7677@google.com> (raw)
In-Reply-To: <20120911082501.GH7028@soda.linbit>

Hello,

On Tue, Sep 11, 2012 at 10:25:01AM +0200, Lars Ellenberg wrote:
> Or do we have a better place to document write ordering requirements?
> 
> "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.
> 
> Additionally, to avoid integrity issues due to volatile caches,
> you need to use FLUSH/FUA as appropriate."

I think it would be best to note the lack of any ordering guarantee in
the comment of bio_submit()?  Any one interested in submitting a
patch?

Thanks.

-- 
tejun

  parent reply	other threads:[~2012-09-12 18:58 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-09-04 12:32 FLUSH/FUA documentation & code discrepancy Philipp Reisner
2012-09-04 22:46 ` Tejun Heo
2012-09-05  8:44   ` [Drbd-dev] " Philipp Reisner
2012-09-05  8:49     ` Tejun Heo
2012-09-05 10:07       ` Lars Ellenberg
2012-09-06 21:29         ` Tejun Heo
2012-09-07  8:42           ` Lars Ellenberg
2012-09-10 22:54             ` Tejun Heo
2012-09-10 23:06               ` Tejun Heo
2012-09-10 23:12                 ` Kent Overstreet
2012-09-10 23:31                 ` Kent Overstreet
2012-09-11  5:58                   ` NeilBrown
2012-09-11  8:25                     ` Lars Ellenberg
2012-09-11 14:41                       ` Vivek Goyal
2012-09-12 18:58                       ` Tejun Heo [this message]
2012-09-12 23:12                         ` Joseph Glanville
2012-09-12 23:20                           ` Tejun Heo
2012-09-12 23:53                             ` Joseph Glanville
2012-09-13  0:17                               ` Joseph Glanville
2012-09-13  3:10                                 ` Joseph Glanville
2012-09-13 19:25                                   ` Tejun Heo
2012-09-11 14:34                 ` Vivek Goyal

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