linux-ext4 - Re: [PATCH 4/4] ext4: reimplement uninit extent optimization for move_extent_per

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Date:	Wed, 26 Sep 2012 12:56:55 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Dmitry Monakhov <dmonakhov@...nvz.org>
Cc:	linux-ext4@...r.kernel.org, a-fujita@...jp.nec.com
Subject: Re: [PATCH 4/4] ext4: reimplement uninit extent optimization for
 move_extent_per_page V2

On Mon, Sep 24, 2012 at 04:23:54PM +0400, Dmitry Monakhov wrote:
> Uninitialized extent may became initialized(parallel writeback task)
> at any moment after we drop i_data_sem, so we have to recheck extent's
> state after we hold page's lock and i_data_sem.
> 
> If we about to change page's mapping we must hold page's lock in order to
> serialize other users.
> Changes from V1 in response to Akira's comments:
> - fix last block mistype
> - Rerutn inital error code
> 
> Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>

Thanks, applied.

					- Ted
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