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

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Date:	Wed, 25 Aug 2010 22:02:24 +0200
From:	Jan Kara <jack@...e.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	Christoph Hellwig <hch@....de>, jack@...e.cz, 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 Wed 25-08-10 17:57:41, Tejun Heo wrote:
> 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?
  I'm quite confident the patch is correct so you can merge it I think but
tomorrow I'll give it some crash testing together with the rest of your
patch set in KVM to be sure.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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