linux-ext4 - Re: [PATCH] ext3: wait on all pending commits in ext3_sync

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Message-ID: <496CCD9B.7070308@redhat.com>
Date:	Tue, 13 Jan 2009 11:21:31 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	Jan Kara <jack@...e.cz>
CC:	Arthur Jones <ajones@...erbed.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"sct@...hat.com" <sct@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ext3: wait on all pending commits in ext3_sync_fs

Jan Kara wrote:
>   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

Sorry, kind of slipped through the cracks.  I'll do that and run it
through the testcase today.

-Eric
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