block: switch gendisk lookup to a simple xarray
Now that bdev_map is only used for finding gendisks, we can use a simple xarray instead of the regions tracking structure for it. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NHannes Reinecke <hare@suse.de> Reviewed-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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