linux-kernel - Re: [PATCH 00/16] DRBD: a block device for HA clusters

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Date:	Tue, 5 May 2009 17:03:13 +0200
From:	Bart Van Assche <bart.vanassche@...il.com>
To:	Philipp Reisner <philipp.reisner@...bit.com>
Cc:	James Bottomley <James.Bottomley@...senpartnership.com>,
	david@...g.hm, Willy Tarreau <w@....eu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Jens Axboe <jens.axboe@...cle.com>,
	Greg KH <gregkh@...e.de>, Neil Brown <neilb@...e.de>,
	Sam Ravnborg <sam@...nborg.org>, Dave Jones <davej@...hat.com>,
	Nikanth Karthikesan <knikanth@...e.de>,
	Lars Marowsky-Bree <lmb@...e.de>,
	Kyle Moffett <kyle@...fetthome.net>,
	Lars Ellenberg <lars.ellenberg@...bit.com>
Subject: Re: [PATCH 00/16] DRBD: a block device for HA clusters

On Tue, May 5, 2009 at 10:21 AM, Philipp Reisner
<philipp.reisner@...bit.com> wrote:
> What we have in DRBD boils down to:
>
> * We obey all possible write after write dependencies in the stream of
>  writes we get from the upper layers. And generate DRBD internal
>  reorder barriers for the packet stream.

Hello Philipp,

I couldn't find a call to blk_queue_ordered() in the DRBD 8.3.1 source
code. This made me wonder how DRBD obtains information about barriers
that is generated by filesystems like ext3 with the option barrier=1 ?

Bart.
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