linux-ext4 - Re: [PATCH 4/4]ext4: Fix different block exchange issue in EXT4_IOC_MOVE

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Date:	Wed, 16 Sep 2009 14:20:57 -0400
From:	Theodore Tso <tytso@....edu>
To:	Akira Fujita <a-fujita@...jp.nec.com>
Cc:	linux-ext4@...r.kernel.org, Peng Tao <bergwolf@...il.com>
Subject: Re: [PATCH 4/4]ext4: Fix different block exchange issue in
	EXT4_IOC_MOVE_EXT

On Mon, Sep 14, 2009 at 05:17:30PM +0900, Akira Fujita wrote:
> ext4: Fix different block exchange issue in EXT4_IOC_MOVE_EXT
> 
> From: Akira Fujita <a-fujita@...jp.nec.com>
> 
> If logical block offset of original file which is passed to
> EXT4_IOC_MOVE_EXT is different from donor file's,
> a calculation error occurs in ext4_calc_swap_extents(),
> therefore wrong block is exchanged between original file and donor file.
> As a result, we hit ext4_error() in check_block_validity().
> To detect the logical offset difference in EXT4_IOC_MOVE_EXT,
> add checks to mext_calc_swap_extents() and handle it as error,
> since data exchange must be done between the same blocks in EXT4_IOC_MOVE_EXT.
> 
> Reported-by: Peng Tao　<bergwolf@...il.com>　
> Signed-off-by: Akira Fujita <a-fujita@...jp.nec.com>

Applied, thanks.

						- Ted
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