rbd: record mapped size
authorAlex Elder <elder@inktank.com>
Thu, 30 Aug 2012 19:42:15 +0000 (14:42 -0500)
committerAlex Elder <elder@inktank.com>
Mon, 1 Oct 2012 19:30:51 +0000 (14:30 -0500)
Add the size of the mapped image to the set of mapping-specific
fields in an rbd_device, and use it when setting the capacity of the
disk.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

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