Re: [Qemu-block] [RFC PATCH] qemu-io: add drain/undrain cmd

[Stefan Hajnoczi]

On Mon, May 15, 2017 at 12:02:43PM +0200, Peter Lieven wrote:
> I would like to add a feature to Qemu to drain all traffic from a block so 
> that
> I can take external snaphosts without the risk to that in the middle of a 
> write
> operation. Its meant for cases where where QGA freeze/thaw is not available.
> 
> For me its enough to have this through qemu-io, but Kevin asked me to check
> if its not worth to have a stable API for it and present it via QMP/HMP.
> 
> What are your thoughts?

Are the existing snapshot and blockjobs not sufficient for taking
external snapshots?

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