block: move bd_part_count to struct gendisk
The bd_part_count value only makes sense for whole devices, so move it to struct gendisk and give it a more descriptive name. Signed-off-by:Christoph Hellwig <hch@lst.de> Reviewed-by:
Hannes Reinecke <hare@suse.de> Reviewed-by:
Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20210525061301.2242282-7-hch@lst.deSigned-off-by:
Jens Axboe <axboe@kernel.dk>
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