Re: [Qemu-devel] [PATCH 0/2] virtagent - fsfreeze support

[Jes Sorensen]

On 02/01/11 15:16, Stefan Hajnoczi wrote:
> On Tue, Feb 1, 2011 at 10:58 AM,  <address@hidden> wrote:
>> From: Jes Sorensen <address@hidden>
>> This is a first attempt to add fsfreeze support to virtagent. The idea
>> is for the guest agent to walk the list of locally mounted file
>> systems in the guest, and issuing an ioctl to freeze them. The host
>> can then do a live snapshot of the guest, obtaining stable file
>> systems. After the snapshot, the host then calls the thaw function in
>> virtagent, which goes through the list of previously frozen file
>> systems and unfreezes them.
> 
> Any plans for a call-out to pre/post freeze and thaw scripts so that
> applications can flush cached data to disk and brace themselves for
> freeze?

Michael and I were discussing this earlier, we need to add it somehow.
It could be done as call-outs from the freeze call, or from separate
agent calls.

Cheers,
Jes