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Re: [Qemu-devel] [Nbd] [Qemu-block] How to online resize qemu disk with

From: Alex Bligh
Subject: Re: [Qemu-devel] [Nbd] [Qemu-block] How to online resize qemu disk with nbd protocol?
Date: Sat, 14 Jan 2017 15:30:24 +0000

> On 14 Jan 2017, at 14:48, Wouter Verhelst <address@hidden> wrote:
> On Thu, Jan 12, 2017 at 06:56:42PM +0000, Alex Bligh wrote:
>> My preferred way to do this would be essentially to allow NBD_OPT_INFO
>> to be sent (wrapped appropriately) during the main transmission phase.
>> That would allow *any* INFO stuff to be reread.
> Can you go into a bit more detail how you'd see that? It feels a bit
> awkward to me, at best; but I could be missing something.

Well, the idea would be something like: NBD_CMD_INFO, use the offset
specified as the the information type, and put the INFO reply
within the reply block. I guess the client doesn't know the
length of the reply so we'd have to use structured replies
or similar. Although looking through the current info types,
I can't see why today you'd want to reread anything other than
the length, so maybe this is useless futureproofing.

Alex Bligh

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