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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/4867
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
a3fbe5d447