Re: [dm-devel] block mapping

["Kasatkin, Dmitry" <dmitry kasatkin intel com>]

Hello,


On Thu, Sep 29, 2011 at 4:42 PM, Zdenek Kabelac <zkabelac redhat com> wrote:
> Dne 29.9.2011 15:35, Kasatkin, Dmitry napsal(a):
>> Hello All,
>>
>> I would like to implement such block device, which can store
>> additional information along with the block data.
>> For example. so if file system has 4k block, I would like to store
>> 4k+256b of additional information...
>>
>> Can such block device be implemented with device mapper?
>>
>
> Yes - i.e.the old snapshot target stores the block and it's remapping info
> (thought the size info is much smaller then 256b)
>

1. Old snapshot target? Where is it...

2. Isn't it stores some data at the beginning of the block device - in
the header..
Like LUKS does with dm-crypt?

Thanks

> Zdenek
>
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