On 2015-09-09 09:25, David Sterba wrote:
> On Wed, Sep 09, 2015 at 11:24:17AM +0800, Qu Wenruo wrote:
>> The problem is that, for converted image, it's quite possible that data
>> and metadata extent are stored in one chunk even the chunk is not mixed.
>>
>> I'll add fsck support for it soon.
>
> That would be great, I have no idea how the data/metadata can get mixed.
> Does this involve inlied file data that come from ext4?
Hmm, I'm actually kind of curious about this too.  AFAIK, the inline 
file data limit on ext* is significantly smaller than on btrfs.  I could 
possibly see a really badly fragmented ext* filesystem causing this to 
happen because of the chunk size requirements in btrfs, but I would 
expect such a case to fail in new and unexpected ways as a result.