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Alex Elder authored
Define a new rbd device flags field, manipulated using bit operations. Replace the use of the current "exists" flag with a bit in this new "flags" field. Add a little commentary about the "exists" flag, which does not need to be manipulated atomically. Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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