[sheepdog] [PATCH v2 1/2] sheep, dog: make recycling VID selectable

[MORITA Kazutaka]

At Mon, 16 Mar 2015 21:13:29 +0800,
Liu Yuan wrote:
> 
> How about make 'dog vdi clone --no-share' as the default clone operation? And
> we can add dog vdi clone --share to keep old behavior as optional. By this
> manner, --no-share will save us from this kind of subtle problem. And your team
> problem about vdi exhaustion will be achieved :).

--no-share option disables thin provisioing.  It shouldn't be a default option,
IMHO.

> 
> This manner is not perfect, but it will benefit us:
> 
> 1. stable code base since old algorithm is long tested.

Hitoshi's patch enables the stable algorithm by default.  Isn't it enough?

> 2. we won't degrate vdi_lookup

I'm still not sure which code in vdi_lookup() is a problem.  The problem
happens even when we disable VID garbage collection?

Thanks,

Kazutaka