Re: [Qemu-devel] [PATCH for 2.1 V3] qemu-img info: show nocow info

[Eric Blake]

On 07/28/2014 09:19 AM, Stefan Hajnoczi wrote:
> On Wed, Jul 09, 2014 at 10:43:13AM +0800, Chunyan Liu wrote:
>> Add nocow info in 'qemu-img info' output to show whether the file
>> currently has NOCOW flag set or not.
>>
>> Signed-off-by: Chunyan Liu <address@hidden>
>> ---
>> Changes:
>>   - update output info to "NOCOW flag: set"
>>
>>  block/qapi.c         | 25 +++++++++++++++++++++++++
>>  qapi/block-core.json |  5 ++++-
>>  2 files changed, 29 insertions(+), 1 deletion(-)
> 
> This patch was sent on July 9th, after the 2.1 soft freeze when we stop
> merging new features.  Soft freeze was 17th of June.
> 
> Please resend for QEMU 2.2 and update the qapi-schema.json version
> comment.

There's still the argument that this is a bug fix for an incomplete
implementation of a new feature that IS in qemu 2.1 (that is, 2.1 is
adding the ability to set the nocow flag, but without this patch, that
addition is a write-only interface, and this patch is correcting the bug
to allow it to be a read-write interface).

But it is fairly late in the game - what is the level of damage if 2.1
is released with a write-only setting, and this patch is deferred to
2.2?  Without some strong justification, I can agree with the decision
to postpone this patch.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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