linux-kernel - Re: [Ocfs2-devel] [PATCH 12/17] ocfs2: Update syncing after splicing to match generic version

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Date:	Tue, 25 Aug 2009 15:13:25 +0200
From:	Jan Kara <jack@...e.cz>
To:	Joel Becker <Joel.Becker@...cle.com>
Cc:	Mark Fasheh <mfasheh@...e.com>, Jan Kara <jack@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org, ocfs2-devel@....oracle.com
Subject: Re: [Ocfs2-devel] [PATCH 12/17] ocfs2: Update syncing after
	splicing to match generic version

On Mon 24-08-09 11:40:09, Joel Becker wrote:
> On Mon, Aug 24, 2009 at 11:35:43AM -0700, Mark Fasheh wrote:
> > On Fri, Aug 21, 2009 at 07:24:02PM +0200, Jan Kara wrote:
> > > Update ocfs2 specific splicing code to use generic syncing helper. The sync now
> > > does not happen under rw_lock because generic_write_sync() acquires i_mutex
> > > which ranks above rw_lock. That should not matter because standard fsync path
> > > does not hold it either.
> > 
> > Thanks Jan,
> > 
> > Acked-by: Mark Fasheh <mfasheh@...e.com>
> 
> <aol>Me too!</aol>
> Acked-by: Joel Becker <joel.becker@...cle.com>
  Thanks. BTW: There's also the patch
ocfs2: Use __generic_file_aio_write instead of generic_file_aio_write_nolock
  in the series you might want to have a look at. Actually, I did a
straightforward opencoding of generic_osync_inode() but if you agree it's
a good thing to do, I can move the whole sync to the end of the function
out of i_mutex because AFAICS there's no real reason why
filemap_fdatawrite_range() or jbd2_journal_force_commit() should need any
cluster lock or mutex. We probably only need to decide under those locks,
whether we need to call jbd2_journal_force_commit() or not.

									Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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