Re: [Qemu-devel] [PATCH v3 0/8] block: drive-backup live backup command

[Paolo Bonzini]

Il 20/05/2013 08:24, Stefan Hajnoczi ha scritto:
>> > You only need to fdatasync() before every guest flush, no?
> No, you need to set the dirty bit before issuing the write on the
> host.  Otherwise the image data may be modified without setting the
> appropriate dirty bit.  That would allow data modifications to go
> undetected!

But data modifications can go undetected until the guest flush returns,
can't they?

Paolo