linux-ext4 - Re: [PATCH 2/5] ext4: Use redirty_page_for_writepage() in ext4_bio_write

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Message-ID: <20130117183501.GD29972@thunk.org>
Date:	Thu, 17 Jan 2013 13:35:01 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/5] ext4: Use redirty_page_for_writepage() in
 ext4_bio_write_page()

On Wed, Jan 02, 2013 at 06:45:41PM +0100, Jan Kara wrote:
> When we cannot write a page we should use redirty_page_for_writepage()
> instead of plain set_page_dirty(). That tells writeback code we have
> problems, redirties only the page (redirtying buffers is not needed),
> and updates mm accounting of failed page writes.
> 
> Also move clearing of buffer dirty flag after io_submit_add_bh(). At that
> moment we are sure buffer will be going to disk.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

This sounds like a bug fix, not just a clean up.  Do you think the
impact of not using redirty_page_for_writeback() is bad enough that we
should add a cc: stable@...r.kernel.org tag?  As I recall, not doing
this would end up leaving the page flags and radix tree to be
inconsistent, right?

	    	       	   	      - Ted
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