libceph: improve packing in struct ceph_osd_req_op
The layout of struct ceph_osd_req_op leaves lots of holes. Rearranging things a little for better field alignment reduces the size by a third. This resolves: http://tracker.ceph.com/issues/4163Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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