linux-ext4 - Re: [PATCH 3/3 v3] ext4: add dio overwrite nolock

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Message-ID: <20120709150118.GE3649@thunk.org>
Date:	Mon, 9 Jul 2012 11:01:19 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Zheng Liu <gnehzuil.liu@...il.com>
Cc:	linux-ext4@...r.kernel.org, Tao Ma <tm@....ma>,
	Eric Sandeen <sandeen@...hat.com>,
	Robin Dong <hao.bigrat@...il.com>,
	Zheng Liu <wenqing.lz@...bao.com>
Subject: Re: [PATCH 3/3 v3] ext4: add dio overwrite nolock

On Sun, Jul 01, 2012 at 10:21:46PM +0800, Zheng Liu wrote:
> From: Zheng Liu <wenqing.lz@...bao.com>
> 
> Aligned and overwrite direct I/O can be parallelized.  In ext4_file_dio_write,
> we first check whether these conditions are satisfied or not.  If so, we
> take i_data_sem and release i_mutex lock directly.  Meanwhile iocb->private is
> set to indicate that this is a dio overwrite, and it will be handled in
> ext4_ext_direct_IO.
> 
> CC: Tao Ma <tm@....ma>
> CC: Eric Sandeen <sandeen@...hat.com>
> CC: Robin Dong <hao.bigrat@...il.com>
> Signed-off-by: Zheng Liu <wenqing.lz@...bao.com>

Thanks, applied.

					- Ted
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