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Re: [Qemu-devel] [PATCH] block/stream: Don't stream unbacked devices
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH] block/stream: Don't stream unbacked devices |
Date: |
Fri, 15 Nov 2013 09:18:11 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Nov 14, 2013 at 03:07:09PM +0100, Paolo Bonzini wrote:
> Il 14/11/2013 14:41, Stefan Hajnoczi ha scritto:
> But such a no-op streaming is valid, just like it is valid to
> enable copy-on-read without a backing file. Think of a system that
> starts streaming a disk as soon as the VM starts, because *if* there's a
> backing file it knows it is just a template on a remote/slow filesytem.
> It's easier for such a system to invoke the command even if there's no
> backing file.
Since making it an error breaks the API now, let's take this patch and
move on.
I still think it could help users that are issuing the command
incorrectly, but there's not much we can do about that now.
Stefan