block/mirror: Add copy mode QAPI interface
This patch allows the user to specify whether to use active or only background mode for mirror block jobs. Currently, this setting will remain constant for the duration of the entire block job. Signed-off-by: NMax Reitz <mreitz@redhat.com> Reviewed-by: NAlberto Garcia <berto@igalia.com> Message-id: 20180613181823.13618-14-mreitz@redhat.com Signed-off-by: NMax Reitz <mreitz@redhat.com>
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