linux-ext4 - Re: [PATCH 17/26] ext4: Use transaction reservation for extent conversion in ext4_end

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Message-ID: <20130604172922.GH3030@thunk.org>
Date:	Tue, 4 Jun 2013 13:29:22 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 17/26] ext4: Use transaction reservation for extent
 conversion in ext4_end_io

On Fri, May 31, 2013 at 11:42:50AM +0200, Jan Kara wrote:
> Later we would like to clear PageWriteback bit only after extent conversion
> from unwritten to written extents is performed. However it is not possible
> to start a transaction after PageWriteback is set because that violates
> lock ordering (and is easy to deadlock). So we have to reserve a transaction
> before locking pages and sending them for IO and later we use the transaction
> for extent conversion from ext4_end_io().
> 
> Reviewed-by: Zheng Liu <wenqing.lz@...bao.com>
> Signed-off-by: Jan Kara <jack@...e.cz>

Thanks, applied.

					- Ted
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