Date: Mon, 12 Jan 2009 23:28:34 +0100
From: Jan Kara <jack@suse.cz>
To: Eric Sandeen <sandeen@redhat.com>
Cc: Arthur Jones <ajones@riverbed.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       "linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>,
       "sct@redhat.com" <sct@redhat.com>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] ext3: wait on all pending commits in ext3_sync_fs
Message-ID: <20090112222834.GA25494@atrey.karlin.mff.cuni.cz>
References: <4908C951.2000309@redhat.com> <20081103184426.GA31894@ajones-laptop.nbttech.com> <20081103113318.35b0c266.akpm@linux-foundation.org> <20081103201428.GB30565@ajones-laptop.nbttech.com> <20081218231707.GB20092@atrey.karlin.mff.cuni.cz> <494ADEB3.8010109@redhat.com>
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  Hi Eric,

> Jan Kara wrote:
> >   Hello,
> > 
> >   I'm sorry I'm replying late but I got time to react to this only now...
> > 
> 
> >> I tried this and it too fixes the problem.  FWIW I agree it
> >> looks better...
> >   Well, shouldn't we rather fix what journal_start_commit() returns?
> > The interface which returns 1 when a transaction is already committing or
> > a transaction commit has just been started but 0 when we race with
> > somebody staring the commit is fairly unusable. Moreover
> > ext3_force_commit() will unnecessarily create new sync transaction and
> > commit it if there's no transaction running which is quite expensive
> > (even merging empty sync handle is not for free because of sync
> > transaction batching). But this is minor problem since we probably
> > don't care too much about sync() performance - BTW this is probably a
> > cause for bug 12224, isn't it?
> 
> Yep, it is!  :)
> 
> >   BTW: ocfs2 would need fixing as well if done your way since it's
> > sync_fs function has been copied over from ext3.
> >   To summarized I'd rather see a patch like below (untested) going in
> > and your patch reverted... Opinions? I can cookup a JBD2 version of
> > the patch in case we agree to go this way.
> 
> Thanks, I'll look that over.
  Any chance you've looked over that patch? Thanks.

								Honza
-- 
Jan Kara <jack@suse.cz>
SuSE CR Labs
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