block: split flags in copy_range
Pass read flags and write flags separately. This is needed to handle coming BDRV_REQ_NO_SERIALISING clearly in following patches. Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: NFam Zheng <famz@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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