From d0265de7c358d71a494dcd1ee28206b32754bb0f Mon Sep 17 00:00:00 2001
From: Josh Durgin <josh.durgin@inktank.com>
Date: Mon, 7 Apr 2014 16:54:10 -0700
Subject: [PATCH] rbd: tolerate -ENOENT for discard operations

Discard may try to delete an object from a non-layered image that does not exist.
If this occurs, the image already has no data in that range, so change the
result to success.

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