qemu-nbd: add option to set detect-zeroes mode
Signed-off-by: NPeter Lieven <pl@kamp.de> Reviewed-by: NEric Blake <eblake@redhat.com> Reviewed-by: NBenoit Canet <benoit.canet@nodalink.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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