On 05.02.2016 09:58, Vladimir Sementsov-Ogievskiy wrote:
> The new feature for qcow2: storing bitmaps.
> 
> This patch adds new header extension to qcow2 - Bitmaps Extension. It
> provides an ability to store virtual disk related bitmaps in a qcow2
> image. For now there is only one type of such bitmaps: Dirty Tracking
> Bitmap, which just tracks virtual disk changes from some moment.
> 
> Note: Only bitmaps, relative to the virtual disk, stored in qcow2 file,
> should be stored in this qcow2 file. The size of each bitmap
> (considering its granularity) is equal to virtual disk size.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> ---

[...]

>  docs/specs/qcow2.txt | 221 ++++++++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 220 insertions(+), 1 deletion(-)

Reviewed-by: Max Reitz <mreitz@redhat.com>