linux-ext4 - Re: [Ocfs2-devel] [PATCH 2/3] JBD2: Allow feature checks before journal recovery

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Message-ID: <20100813071720.GA21279@mail.oracle.com>
Date:	Fri, 13 Aug 2010 00:17:25 -0700
From:	Joel Becker <Joel.Becker@...cle.com>
To:	"Ted Ts'o" <tytso@....edu>, Jan Kara <jack@...e.cz>,
	"Patrick J. LoPresti" <lopresti@...il.com>,
	ocfs2-devel@....oracle.com, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Ocfs2-devel] [PATCH 2/3] JBD2: Allow feature checks before
 journal recovery

On Thu, Aug 12, 2010 at 11:39:30PM -0400, Ted Ts'o wrote:
> On Thu, Aug 12, 2010 at 10:43:19AM -0700, Joel Becker wrote:
> > On Thu, Jul 22, 2010 at 03:04:16PM -0700, Patrick J. LoPresti wrote:
> > > Before we start accessing a huge (> 16 TiB) OCFS2 volume, we need to
> > > confirm that its journal supports 64-bit offsets.  In particular, we
> > > need to check the journal's feature bits before recovering the journal.
> > > 
> > > This is not possible with JBD2 at present, because the journal
> > > superblock (where the feature bits reside) is not loaded from disk until
> > > the journal is recovered.
> > > 
> > > This patch loads the journal superblock in
> > > jbd2_journal_check_used_features() if it has not already been loaded,
> > > allowing us to check the feature bits before journal recovery.
> > > 
> > > Signed-off-by: Patrick LoPresti <lopresti@...il.com>
> > 
> > Dear jbd2 developers,
> > 	I've pushed this patch to the merge-window branch of ocfs2.git.
> > I'm ready to send it to Linus, but I need your OK.
> 
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>

	Thanks Ted!

Joel

-- 

"I don't even butter my bread; I consider that cooking."
         - Katherine Cebrian

Joel Becker
Consulting Software Developer
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
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