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Date: Mon, 19 Nov 2012 11:30:06 +0100
From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
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Subject: Re: [Qemu-devel] scsi-hd with discard_granularity and unmap results
 in Aborted Commands
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: qemu-devel@nongnu.org

Am 19.11.2012 11:23, schrieb Paolo Bonzini:
> Il 19/11/2012 11:13, Stefan Priebe - Profihost AG ha scritto:
>>>>>
>>>>
>>>> So you mean this is not a bug in rbd or qemu this is a general bug in
>>>> the linux kernel since they implemented discard?
>>>
>>> Yes.
>>
>> As you're known in the linux dev community ;-) Might you open a thread /
>> discussion in the linux kernel mailinglist CC'ing me regarding this
>> problem? I think when i open one - no one will listen ;-)
>
> Yeah, I'll try making and sending a patch, that's usually a good way to
> convince those guys to listen...
Thanks.

But do you have any idea why it works with an iscsi / libiscsi backend? 
In that case the kernel does not cancel the I/O.

Greets,
Stefan