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

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Message-ID: <20090114172750.GJ19950@duck.suse.cz>
Date:	Wed, 14 Jan 2009 18:27:50 +0100
From:	Jan Kara <jack@...e.cz>
To:	Theodore Tso <tytso@....edu>, Eric Sandeen <sandeen@...hat.com>,
	Jan Kara <jack@...e.cz>, 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

On Tue 13-01-09 23:24:02, Theodore Tso wrote:
> On Tue, Jan 13, 2009 at 04:14:11PM -0600, Eric Sandeen wrote:
> > 
> > This looks sane to me, and it does fix the below testcase.
> > 
> > Care to formally propose it?
> 
> Can we confirm what is being proposed?  From following this thread, I
> think what folks are suggesting is:
> 
> 1)  Revert the current "ext3/4: wait on all pending ocmmits in ext3/4_sync_fs"
  Yes.

> 2)  Apply Jan's patch "jbd[2]: Fix return value of journal_start_commit()"
  Yes.

> 3)  Also apply Jan's patch "jbd2: Skip commit of a transaction without
> any buffers" since it appears to be a good optimization (although it's
> not clear it would happen once we revert (1), above.
  Yes, it's an optimization but I'm still a bit afraid about something
relying on jbd2_journal_force_commit() implying a barrier which would not
always be a case after this patch... So we should probably audit all users of
ext4_force_commit() and check that this change is fine with them.

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