linux-kernel - Re: [PATCH 26/30] ext4: do not send discards as barriers

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Message-ID: <4C753D75.2010305@kernel.org>
Date:	Wed, 25 Aug 2010 17:57:41 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Christoph Hellwig <hch@....de>, jack@...e.cz
CC:	jaxboe@...ionio.com, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-ide@...r.kernel.org, linux-raid@...r.kernel.org,
	James.Bottomley@...e.de, tytso@....edu, chris.mason@...cle.com,
	swhiteho@...hat.com, konishi.ryusuke@....ntt.co.jp,
	dm-devel@...hat.com, vst@...b.net, rwheeler@...hat.com,
	hare@...e.de, neilb@...e.de, rusty@...tcorp.com.au, mst@...hat.com,
	jeremy@...p.org, snitzer@...hat.com, k-ueda@...jp.nec.com,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 26/30] ext4: do not send discards as barriers

On 08/25/2010 06:00 PM, Christoph Hellwig wrote:
> On Wed, Aug 25, 2010 at 05:58:42PM +0200, Christoph Hellwig wrote:
>> On Wed, Aug 25, 2010 at 05:47:43PM +0200, Tejun Heo wrote:
>>> From: Christoph Hellwig <hch@...radead.org>
>>>
>>> ext4 already uses synchronous discards, no need to add I/O barriers.
>>
>> This needs the patch that Jan sent in reply to my initial version merged
>> into it.
> 
> Actually the jbd2 patch needs it merged, but the point still stands.

Yeah, wasn't sure about that one.  Has anyone tested it?  I'll be
happy to merge it but I have no idea whether it's correct or not and
Jan didn't seem to have tested it so...  Jan, shall I merge the patch?

Thanks.

-- 
tejun
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