linux-ext4 - Re: [PATCH 2/3 v3] ext4: add a new flag for ext4_map

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Date:	Mon, 9 Jul 2012 10:49:02 -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 2/3 v3] ext4: add a new flag for ext4_map_blocks

On Sun, Jul 01, 2012 at 10:21:45PM +0800, Zheng Liu wrote:
> From: Zheng Liu <wenqing.lz@...bao.com>
> 
> EXT4_GET_BLOCKS_NO_LOCK flag is added to indicate that we don't need to acquire
> i_data_sem lock in ext4_map_blocks.  Meanwhile, it lets _ext4_get_block do not
> start a new journal because when we do a overwrite dio, there is no any
> metadata that needs to be modified.
> 
> We define a new function called ext4_get_block_write_nolock, which is used in
> dio overwrite nolock.  In this function, it doesn't try to acquire i_data_sem
> lock and doesn't start a new journal as it does a lookup.
> 
> 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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