Re: [Qemu-devel] [PATCH 1/2] Add virtagent file system freeze/thaw

[Stefan Hajnoczi]

On Tue, Feb 1, 2011 at 10:58 AM,  <address@hidden> wrote:
> From: Jes Sorensen <address@hidden>
>
> Implement freeze/thaw support in the guest, allowing the host to
> request the guest freezes all it's file systems before a live snapshot
> is performed.
>  - fsfreeze(): Walk the list of mounted local real file systems,
>               and freeze them.

Does this add a requirement that guest agent code issues no disk I/O
in its main loop (e.g. logging)?  Otherwise we might deadlock
ourselves waiting for I/O which is never issued.

Stefan