linux-ext4 - Re: [PATCH 4/4] jbd: fix error handling for checkpoint io (rebased)

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Date:	Wed, 14 May 2008 10:37:47 -0400
From:	Josef Bacik <jbacik@...hat.com>
To:	Jan Kara <jack@...e.cz>
Cc:	Josef Bacik <jbacik@...hat.com>,
	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
	Andrew Morton <akpm@...ux-foundation.org>, sct@...hat.com,
	adilger@...sterfs.com, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org, Mingming Cao <cmm@...ibm.com>,
	Satoshi OSHIMA <satoshi.oshima.fk@...achi.com>,
	sugita <yumiko.sugita.yf@...achi.com>
Subject: Re: [PATCH 4/4] jbd: fix error handling for checkpoint io (rebased)

On Wed, May 14, 2008 at 04:44:10PM +0200, Jan Kara wrote:
> > >  
> > > Index: linux-2.6.26-rc2/fs/ext3/super.c
> > > ===================================================================
> > > --- linux-2.6.26-rc2.orig/fs/ext3/super.c
> > > +++ linux-2.6.26-rc2/fs/ext3/super.c
> > > @@ -395,7 +395,10 @@ static void ext3_put_super (struct super
> > >  	ext3_xattr_put_super(sb);
> > >  	journal_destroy(sbi->s_journal);
> > >  	if (!(sb->s_flags & MS_RDONLY)) {
> > > -		EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
> > > +		if (!is_checkpoint_aborted(sbi->s_journal)) {
> > > +			EXT3_CLEAR_INCOMPAT_FEATURE(sb,
> > > +				EXT3_FEATURE_INCOMPAT_RECOVER);
> > > +		}
> > >  		es->s_state = cpu_to_le16(sbi->s_mount_state);
> > >  		BUFFER_TRACE(sbi->s_sbh, "marking dirty");
> > >  		mark_buffer_dirty(sbi->s_sbh);
> > 
> > Is this bit here really needed?  If we abort the journal the fs will be mounted
> > read only and we should never get in here.  Is there a case where we could abort
> > the journal and not be flipped to being read-only?  If there is such a case I
> > would think that we should fix that by making the fs read-only, and not have
> > this check.
>   Actually, journal_abort() (which could be called from journal_destroy())
> does nothing to the filesystem as such. So at this moment, ext3 can still
> happily think everything is OK. We only detect aborted journal in
> ext3_journal_start_sb() and call ext3_abort() in that case, which does all
> that is needed...
>

Hmm you're right, I was thinking we did some other stuff before put_super which
would have caught a journal abort but it looks like thats not the case.  Still
shouldn't do is_checkpoint_aborted(sbi->s_journal) since journal_destroy()
kfree's the journal.  Should probably move the is_journal_aborted() check above
that or something.  Thanks,

Josef 
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