Now that device mapper has been changed to register the disk once
it is fully ready all this code is unused.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NMike Snitzer <snitzer@redhat.com>
Link: https://lore.kernel.org/r/20210804094147.459763-9-hch@lst.deSigned-off-by: NJens Axboe <axboe@kernel.dk>