From b76f82398c1017e303d87760e22125714010207f Mon Sep 17 00:00:00 2001
From: Josh Durgin <josh.durgin@inktank.com>
Date: Mon, 7 Apr 2014 16:52:03 -0700
Subject: [PATCH] rbd: set the remaining discard properties to enable support

max_discard_sectors must be set for the queue to support discard.
Operations implementing discard for rbd zero data, so report that.

Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
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