linux-ext4 - Re: [PATCH 3/4] jbd2: make shure that we do not miss aborted state

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Message-ID: <87mwrn75gt.fsf@openvz.org>
Date:	Wed, 22 May 2013 13:02:10 +0400
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 3/4] jbd2: make shure that we do not miss aborted state

On Tue, 21 May 2013 18:21:14 +0200, Jan Kara <jack@...e.cz> wrote:
> On Thu 16-05-13 16:28:09, Dmitry Monakhov wrote:
> > 
> > Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
>   Can you elaborate a bit more on how the aborted state could be missed so
> that it would cause any problems?
Fairly to say this was fix of hypothetical issue.
Since we  j_state_lock goes trough lock/unlock after wait_event()
we should not miss an error for the certain tid we are interested in.
But this patch makes code looks cleaner. 
> 
> 								Honza
> > ---
> >  fs/jbd2/journal.c |    3 +--
> >  1 files changed, 1 insertions(+), 2 deletions(-)
> > 
> > diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> > index 886ec2f..57b9120 100644
> > --- a/fs/jbd2/journal.c
> > +++ b/fs/jbd2/journal.c
> > @@ -700,12 +700,11 @@ int jbd2_log_wait_commit(journal_t *journal, tid_t tid)
> >  				!tid_gt(tid, journal->j_commit_sequence));
> >  		read_lock(&journal->j_state_lock);
> >  	}
> > -	read_unlock(&journal->j_state_lock);
> > -
> >  	if (unlikely(is_journal_aborted(journal))) {
> >  		printk(KERN_EMERG "journal commit I/O error\n");
> >  		err = -EIO;
> >  	}
> > +	read_unlock(&journal->j_state_lock);
> >  	return err;
> >  }
> >  
> > -- 
> > 1.7.1
> > 
> > --
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> -- 
> Jan Kara <jack@...e.cz>
> SUSE Labs, CR
> --
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