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

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Date:	Thu, 07 Sep 2006 08:11:17 -0700
From:	Badari Pulavarty <pbadari@...ibm.com>
To:	Jan Kara <jack@...e.cz>
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


>   Ugh! Are you sure? For this path the buffer must be attached (only) to
> the running transaction. But then how the commit code comes to it?
> Somebody would have to even manage to refile the buffer from the
> committing transaction to the running one while the buffer is in wbuf[].
> Could you check whether someone does __journal_refile_buffer() on your
> marked buffers, please? Or whether we move buffer to BJ_Locked list in
> the write_out_data: loop? Thanks.
> 
> 							

I added more debug in __journal_refile_buffer() to see if the marked
buffers are getting refiled. I am able to reproduce the problem,
but I don't see any debug including my original prints. (It looks as 
if none of my debug code exists) - its really confusing. 

I will keep looking and get back to you.

I may try Andrew's buffer debug patch - if I get desperate.

Thanks,
Badari

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