Re: [Qemu-devel] [PATCH] Introduce cache images for the QCOW2 format

[Fam Zheng]

On Wed, 08/14 13:03, Alex Bligh wrote:
> 
> On 14 Aug 2013, at 12:52, Fam Zheng wrote:
> 
> > Yes, this one sounds good to have. VMDK and VHDX have this kind of
> > backing file status validation.
> 
> ... though I'd prefer something safer than looking at mtime, for
> instance a sequence number that is incremented prior to any
> bdrv_close if a write has been done since bdrv_open.
> 
It should be incremented prior to any write for each r/w open, in case
program crashes after write but before close.

Fam