bool ImageDispatch<I>::compare_and_write(
io::AioCompletion* aio_comp, io::Extents &&image_extents,
bufferlist &&cmp_bl, bufferlist &&bl, uint64_t *mismatch_offset,
bool ImageDispatch<I>::compare_and_write(
io::AioCompletion* aio_comp, io::Extents &&image_extents,
bufferlist &&cmp_bl, bufferlist &&bl, uint64_t *mismatch_offset,