From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefan Priebe <s.priebe@profihost.ag>
Subject: librbd discard bug problems -> i got it
Date: Mon, 19 Nov 2012 22:19:27 +0100
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Cc: Josh Durgin <josh.durgin@inktank.com>

Hello Josh,

after digging three days around i got it.

The problem is in aio_discard in internal.cc. The i/o fails when AioZero 
or AioTruncate is used.

It works fine with AioRemove. It seems to depend on overlapping. 
Hopefully i'm able to provide a patch this nicht.

Greets,
Stefan