linux-ext4 - Re: [PATCH 12/12] ext4: Fix ext4_writepage() to achieve data=ordered guarantees

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Message-ID: <20130129020810.GC7003@thunk.org>
Date:	Mon, 28 Jan 2013 21:08:10 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 12/12] ext4: Fix ext4_writepage() to achieve data=ordered
 guarantees

On Fri, Jan 18, 2013 at 01:00:46PM +0100, Jan Kara wrote:
> So far ext4_writepage() skipped writing pages that had any delayed or
> unwritten buffers attached. When blocksize < pagesize this breaks
> data=ordered mode guarantees as we can have a page with one freshly
> allocated buffer whose allocation is part of the committing transaction
> and another buffer in the page which is delayed or unwritten. So fix this
> problem by calling ext4_bio_writepage() anyway. It will submit mapped
> buffers and leave others alone.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

Thanks, applied.

					- Ted
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