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Re: [Qemu-block] [PATCH v4 04/11] nbd: Improve server handling of bogus

From: Paolo Bonzini
Subject: Re: [Qemu-block] [PATCH v4 04/11] nbd: Improve server handling of bogus commands
Date: Wed, 15 Jun 2016 00:05:18 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.0

On 14/06/2016 17:59, Alex Bligh wrote:
>> On 14 Jun 2016, at 16:11, Paolo Bonzini <address@hidden> wrote:
>>> To illustrate the problem, look consider what qemu itself would do as
>>> a server if it can't buffer the entire read issued to it.
>> Return ENOMEM?
> Well OK, qemu then 'works' on the basis it breaks another
> part of the spec, which is coping with long reads.

ENOMEM is a documented error code, and the limits extension will help
with that as well.

>> However, it looks like the
>> de facto status prior to structured replies is that the error is in the
>> spec, and this patch introduces a regression.
> Well, I guess the patch makes it work the same as the
> reference server implementation and the spec, which I'd
> consider a fix. My view is that the error is in the
> kernel client.

... and QEMU and BSD.  What good is a server that doesn't interoperate
(albeit only in error cases) with any client?


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