linux-ext4 - Re: [RFC][PATCH] set_page_buffer_dirty should skip unmapped buffers

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Message-ID: <20060906153449.GC18281@atrey.karlin.mff.cuni.cz>
Date:	Wed, 6 Sep 2006 17:34:49 +0200
From:	Jan Kara <jack@...e.cz>
To:	Badari Pulavarty <pbadari@...ibm.com>
Cc:	Andrew Morton <akpm@...l.org>,
	Anton Altaparmakov <aia21@....ac.uk>, sct@...hat.com,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [RFC][PATCH] set_page_buffer_dirty should skip unmapped buffers

> On Wed, 2006-09-06 at 14:47 +0200, Jan Kara wrote:
> 
> > > Andrew, what should we do ? Do you suggest handling this in jbd
> > > itself (like this patch) ?
> >   Actually that part of commit code needs rewrite anyway (and after that
> > rewrite you get rid of ll_rw_block()) because of other problems - the
> > code assumes that whenever buffer is locked, it is being written to disk
> > which is not true... I have some preliminary patches for that but they
> > are not very nice and so far I didn't have enough time to find a nice
> > solution.
> 
> Are you okay with current not-so-elegant fix ? 
  Actually I don't quite understand how it can happen what you describe
(so probably I missed something). How it can happen that some buffers
are unmapped while we are committing them?  journal_unmap_buffers()
checks whether we are not committing truncated buffers and if so, it
does not do anything to such buffers...
							Bye
								Honza
-- 
Jan Kara <jack@...e.cz>
SuSE CR Labs
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