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

[Ted Ts'o]

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 at gmail.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 at mit.edu>

	       		       - Ted