rbd: don't revalidate so much
Whenever a header object event causes a mapped rbd image to refresh its header information, revalidate_disk() is being called. This was done in rbd_dev_refresh() outside the control mutex in order to avoid a lock inversion. Although a an event like this *might* indicate the image has changed size, most of the time it does not. Record the image size before and after the refresh, and only call revalidate_disk() if it changes. This resolves: http://tracker.ceph.com/issues/4867Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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