This adds a helper function to convert a block req op to a nbd cmd type.
It will be used in the last patch to log the type in the timeout
handler.
Reviewed-by: NJosef Bacik <josef@toxicpanda.com>
Signed-off-by: NMike Christie <mchristi@redhat.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>