Hi Jens, this series removes the need to have a struct block_device ready to submit a bio. We basically don't use it anywhere in the block stack anyway - we always go for the gendisk or request_queue. The only exception is partition remapping for which we'll now need an additional partition index. This helps with cases where we submit I/O from a character device (nvme or lightnvm passthrough) or a different block device (upcoming nvme multipath support).
