From: Greg Freemyer <greg.freemyer@gmail.com>
Subject: Re: kernel BUG at fs/ext4/move_extent.c:1317!
Date: Mon, 21 Sep 2009 15:06:15 -0400
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	 <6149e97b0909201822y5f29d091jbc00b740244f39a8@mail.gmail.com>
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Cc: SandeepKsinha <sandeepksinha@gmail.com>,
	ext4 <linux-ext4@vger.kernel.org>, Theodore Tso <tytso@mit.edu>
To: Peng Tao <bergwolf@gmail.com>
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resend - I inadvertently was not in plain text mode before.

On Sun, Sep 20, 2009 at 9:22 PM, Peng Tao <bergwolf@gmail.com> wrote:
> Hi, Sandeep,
>
> On Sun, Sep 20, 2009 at 9:25 PM, SandeepKsinha <sandeepksinha@gmail.com> wrote:
>> Hi Akira/others,
>>
>> I hit the following assert kernel BUG at fs/ext4/move_extent.c:1317!
>>
>> The file I was playing around with was a simple holey file created like:
>>
>> [/mnt]
>> [18:35:13 sinhas]$ dd if=/dev/zero of=/mnt/ext4image seek=1000 count=5
>> 5+0 records in
>> 5+0 records out
>> 2560 bytes (2.6 kB) copied, 0.000146457 s, 17.5 MB/s
>>
>> I am using v2.6.31. I have seen some patchsets a couple of days from
>> you. Does any of them address any similar problem.?
> Yes. The BUG_ON is unnecessary and is removed in the latest mainline
> kernel. Please refer to commit
> daea696dbac0e33af3cfe304efbfb8d74e0effe6 for details.
    <snip>
>   --
>   Cheers,
>    Peng Tao

Ted,

I think the few small ext4_move_ext() / e4defrag related fixes for
sparse files to work should get pushed to stable.  I don't know if
this is the only one or if there are others.

Greg