Josh Durgin a51aa0c042 rbd: expose the correct size of the device in sysfs
If an image was mapped to a snapshot, the size of the head version
would be shown. Protect capacity with header_rwsem, since it may
change.

Signed-off-by: Josh Durgin <josh.durgin@dreamhost.com>
Reviewed-by: Alex Elder <elder@inktank.com>
2012-07-30 18:15:38 -07:00
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