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Re: [Qemu-devel] [Nbd] [Qemu-block] [PATCH] doc: Propose NBD_FLAG_INIT_Z


From: Eric Blake
Subject: Re: [Qemu-devel] [Nbd] [Qemu-block] [PATCH] doc: Propose NBD_FLAG_INIT_ZEROES extension
Date: Tue, 13 Dec 2016 16:36:08 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1

On 12/13/2016 06:18 AM, Wouter Verhelst wrote:
> On Tue, Dec 13, 2016 at 08:38:12AM +0100, Kevin Wolf wrote:
>> Am 12.12.2016 um 19:12 hat Wouter Verhelst geschrieben:
>>> I'm not opposed to this proposal, per se, but there seems to be some
>>> disagreement (by Kevin, for instance) on whether this extension is at
>>> all useful.
>>
>> FWIW, I'm not opposed to adding the flag. I don't think it can hurt, but
>> I wanted to ask the question so that we don't end up adding a feature
>> that noone actually uses. Ultimately it's your call as a maintainer
>> anyway how conservative you want to be with spec additions.
> 
> I'm not opposed either, but I do agree with you that we shouldn't add
> such a feature if it doesn't end up getting used. Especially so if it
> burns a flag in the (16-bit) "transmission flags" field, where space is
> at a premium.

No, it is NOT a "transmission flag", as it is a per-export property
(where we currently have 64 bits).

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

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