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SubjectTrue number of device openers in 2.5
Date
For single-partition devices it is just bd_openers but I am more intersted in 
multi-partition case. Here I need to know about sum of opens for all
partitions including the whole device. It appears that for a container
bd_openers is incremented for every open of itself and for the _first_ open
of partition and bd_part_count is incremented for every (including first)
open of partition. So bdev->bd_contains->bd_openers +
bdev->bd_contains->bd_part_count really gives an access (number of opened
partitions but this is unknown otherwise).

Thank you

-andrey
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