linux-kernel - Re: [PATCH v4] ocfs2: Let ocfs2_setattr use new truncate sequence.

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Message-ID: <20100611075528.GD23946@mail.oracle.com>
Date:	Fri, 11 Jun 2010 00:55:28 -0700
From:	Joel Becker <Joel.Becker@...cle.com>
To:	Christoph Hellwig <hch@....de>, Tao Ma <tao.ma@...cle.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [PATCH v4] ocfs2: Let ocfs2_setattr use new truncate sequence.

On Fri, Jun 11, 2010 at 12:50:20AM -0700, Joel Becker wrote:
> On Fri, Jun 11, 2010 at 09:19:45AM +0200, Christoph Hellwig wrote:
> > On Fri, Jun 11, 2010 at 03:16:13PM +0800, Tao Ma wrote:
> > > oh, that would be much work for ocfs2 to do from my perspective. So I 
> > > would really want to leave it as-is and I have add it to my to-do list.
> > 
> > Oh right, you start a new transaction there.  Sorry, ignore my request
> > and keep it as it is for now.  I don't think doing truncatate in separate
> > transactions actually is correct, though but that's no change with this
> > patch.
> 
> Christoph,
> 	You're missing the part where actual truncate (reduce i_size)
> sets i_size in ocfs2_truncate_file().  So this later code doesn't get
> triggered for the truncate case.  It exists for the extend case, where
> we extend the allocation in multiple clean transactions, then finally
> set i_size in a final transaction.

	Actually, ocfs2_extend_file() appears to handle it too.  I don't
think it used to - there were places that had issues with
commit_write()'s update of i_size, etc.  But that's ancient history.  I
wonder if Mark knows.

joel

-- 

Dort wo man Bücher verbrennt, verbrennt man am Ende auch Mensch.
(Wherever they burn books, they will also end up burning people.)
	- Heinrich Heine

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