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Re: [Qemu-devel] Assertion failure on qcow2 disk with cluster_size != 64
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From: |
Eric Blake |
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Subject: |
Re: [Qemu-devel] Assertion failure on qcow2 disk with cluster_size != 64k |
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Date: |
Mon, 14 Nov 2016 10:59:10 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 |
On 11/14/2016 09:54 AM, Kevin Wolf wrote:
>>>> Our qcow2 support is currently limited to a maximum of 2M clusters;
>>>> while MAX_WRITE_ZEROES_BOUNCE_BUFFER is 32k * 512, or 16M. The
>>>> maximum-size bounce buffer should not be the problem here; but for some
>>>> reason, it looks like alignment is larger than max_transfer which should
>>>> not normally be possible. I'm still playing with what should be the
>>>> right patch, but hope to have something posted soon.
>>>
>>> Are you still playing with it?
>>
>> Patch was posted here:
>>
>> https://lists.gnu.org/archive/html/qemu-devel/2016-11/msg01603.html
>
> Ah, yes, sorry. I didn't make the connection today because this one had
> qcow2 in the subject line and the patch doesn't.
>
> Are you going to add a qemu-iotests case then, or do you want us to
> merge the patch as it is?
I think the patch is ready to merge as-is; I'm still adding a
qemu-iotests addition, but the addition requires enhancing blkdebug
which is a bit extreme to be doing after soft freeze (so the tests are
probably 2.9 material, while the bug fix is still for 2.8)
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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