Re: [Qemu-devel] [PATCH v3] qemu-img: check block status of backing file when converting.

[Denis V. Lunev]

On 04/17/2016 07:30 AM, Ren Kimura wrote:
When converting images, check the block status of its backing file chain
to avoid needlessly reading zeros.
Signed-off-by: Ren Kimura <rkx1209...@gmail.com>

IMHO bdrv_get_block_status_above(bs, NULL, ...) should do the job 
without recursion.