On Mon, Oct 13, 2014 at 10:43:14AM +0700, Pavel Goran wrote:
> Hello Zheng,
>
> Monday, October 13, 2014, 10:45:37 AM, you wrote:
>
> > Yes, detaching a backing device will make all dirty data to be written
> > back to the backing device. But if I understand correctly it couldn't
> > invalidate all data in cache device. That means that after attaching
> > backing device the data in cache device is still valid.
>
> It would be a bug if cached data were considered valid after detaching and
> re-attaching. Because while a cache device an a backing device were separated,
> data could be written to a backing device, this would possibly make data in a
> "disconnected" cache obsolete.
Ah, Thanks for pointing it out. I got it.
BTW, there is a bug when I tried to detach/attach a backing device.
A patch has sent out to the mailing list. That would be great if some
one can review it.
Regards,
- Zheng
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