linux-ext4 - Re: [PATCH v2] ext3: Convert ext3 to new truncate calling convention

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Message-ID: <20110526142337.GA5123@quack.suse.cz>
Date:	Thu, 26 May 2011 16:23:37 +0200
From:	Jan Kara <jack@...e.cz>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Jan Kara <jack@...e.cz>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH v2] ext3: Convert ext3 to new truncate calling
 convention

On Wed 25-05-11 07:48:23, Christoph Hellwig wrote:
> On Wed, May 25, 2011 at 12:43:36PM +0200, Jan Kara wrote:
> > Mostly trivial conversion. We fix a bug that IS_IMMUTABLE and IS_APPEND
> > files could not be truncated during failed writes as we change the code.
> > In fact we remove the test altogether because do_sys_[f]truncate() and
> > may_open() do necessary checks anyway.
> 
> This doesn't look quite correct me.  One of the major points of the
> new truncate sequence is to to *_truncate_page before updating i_size,
> so that we can properly handle an error there.  With your patch it's
> still called too late.
  OK, I missed this point (frankly, handling of error from
ext3_block_truncate_page() does not seem like a huge win when we cannot
handle error anywhere else during truncate but it's an improvement I
agree). I'll move ext3_block_truncate_page() before the setting of i_size.
Thanks for having a look at the patch.

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