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rhel8: bdev vs. gendisk - Coggle Diagram

- - - - if the hd_struct part isn't associated with bdev, blkdev_get() sets the new relation
        
        otherwise, bdev->bd_part holds the reference
        
        blkdev_put() comes?
        
        bdev_get_gendisk() is lockless
        
        __blkdev_get() holds the lock
        
        so if the devt is resused, __blkdev_get() should set new disk?
  - - - bdput()
- - - - devt is the inode number
      - disk is bound with bdev dynamically
        
        devt can be re-used