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

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Message-ID: <20100611075020.GC23946@mail.oracle.com>
Date:	Fri, 11 Jun 2010 00:50:20 -0700
From:	Joel Becker <Joel.Becker@...cle.com>
To:	Christoph Hellwig <hch@....de>
Cc:	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 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.

Joel

-- 

"When choosing between two evils, I always like to try the one
 I've never tried before."
        - Mae West

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