On 22.12.19 12:36, Alberto Garcia wrote:
> qcow2 images with subclusters have 128-bit L2 entries. The first 64
> bits contain the same information as traditional images and the last
> 64 bits form a bitmap with the status of each individual subcluster.
> 
> Because of that we cannot assume that L2 entries are sizeof(uint64_t)
> anymore. This function returns the proper value for the image.
> 
> Signed-off-by: Alberto Garcia <berto@igalia.com>
> ---
>  block/qcow2-cluster.c  | 12 ++++++------
>  block/qcow2-refcount.c | 14 ++++++++------
>  block/qcow2.c          |  8 ++++----
>  block/qcow2.h          |  9 +++++++++
>  4 files changed, 27 insertions(+), 16 deletions(-)

Assuming qcow2_calc_prealloc_size() and qcow2_measure are fixed up in
patch 26:

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