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由 Fam Zheng 提交于
If guest discards a source cluster, mirroring with bdrv_aio_readv is overkill. Some protocols do zero upon discard, where it's best to use bdrv_aio_write_zeroes, otherwise, bdrv_aio_discard will be enough. Signed-off-by: NFam Zheng <famz@redhat.com> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> (cherry picked from commit dcfb3beb) Signed-off-by: NMichael Roth <mdroth@linux.vnet.ibm.com>
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