qemu-img: add support for skipping zeroes in input during convert
we currently do not check if a sector is allocated during convert. This means if a sector is unallocated that we allocate a bounce buffer of zeroes, find out its zero later and do not write it in the best case. In the worst case this can lead to reading blocks from a raw device (like iSCSI) altough we could easily know via get_block_status that they are zero and simply skip them. This patch also fixes the progress output not being at 100% after a successful conversion. Signed-off-by: NPeter Lieven <pl@kamp.de> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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