qemu-io: add write -z option for bdrv_co_write_zeroes
Extend the qemu-io write command with the -z option to call bdrv_co_write_zeroes(). Exposing the zero write interface from qemu-io allows us to write tests that exercise this new block layer interface. Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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