linux-kernel - Re: Lost JBD fix

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Message-ID: <20070712065009.GM4587@kernel.dk>
Date:	Thu, 12 Jul 2007 08:50:11 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>,
	Kirill Korotaev <dev@...nvz.org>, devel@...nvz.org,
	linux-kernel@...r.kernel.org
Subject: Re: Lost JBD fix

On Wed, Jul 11 2007, Chuck Ebbert wrote:
> On 07/09/2007 02:14 PM, Jan Kara wrote:
> >   Hi Andrew,
> > 
> >   it seems we've accidentally lost one JBD fix (probably it was my mistake
> > when rediffing some checkpointing changes) as Kirill has noted. A transaction
> > can currently be released when there are still some buffers on one of its
> > checkpointing lists. Attached patch should fix it (it still seems to apply
> > fine). Please apply it. Thanks.
> > 
> > 								Honza
> > 
> > 
> > ------------------------------------------------------------------------
> > 
> > We have to check that also the second checkpoint list is non-empty before
> > dropping the transaction.
> > 
> > Signed-off-by: Jan Kara <jack@...e.cz>
> > 
> > diff -rupX /home/jack/.kerndiffexclude linux-2.6.16-rc1/fs/jbd/commit.c linux-2.6.16-rc1-1-checkpoint-fix/fs/jbd/commit.c
> > --- linux-2.6.16-rc1/fs/jbd/commit.c	2006-01-15 00:20:12.000000000 +0100
> > +++ linux-2.6.16-rc1-1-checkpoint-fix/fs/jbd/commit.c	2006-01-17 23:35:19.000000000 +0100
> > @@ -829,7 +829,8 @@ restart_loop:
> >  	journal->j_committing_transaction = NULL;
> >  	spin_unlock(&journal->j_state_lock);
> >  
> > -	if (commit_transaction->t_checkpoint_list == NULL) {
> > +	if (commit_transaction->t_checkpoint_list == NULL &&
> > +	    commit_transaction->t_checkpoint_io_list == NULL) {
> >  		__journal_drop_transaction(journal, commit_transaction);
> >  	} else {
> >  		if (journal->j_checkpoint_transactions == NULL) {
> 
> Critical bugfix -- 2.6.22-stable (no earlier versions) should get
> this too, right?

And don't forget that we have a jbd2/ clone as well, for the hugely
succesful ext4 project as well.

-- 
Jens Axboe

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