[sheepdog] [PATCH] sheep: split create_vdi_obj() into 4 functions

[MORITA Kazutaka]

At Thu, 22 Aug 2013 16:57:30 +0800,
Liu Yuan wrote:
> 
> sd_{vdi,snapshot}_create share almost the same logic, how about merge them
> into one function? Either ask sd_{vdi,snapshot}_create call the shared helper
> or use single sd_vdi_create() function

I don't think they share so much the same logic.  Both call
vdi_lookup() but how to handle the return value is different.  Both
calls notify_vdi_add() but it should be moved to cluster_new_vdi()
because we should call it only after we successfully created the vdi
(I think of doing this change in the next version).

Thanks,

Kazutaka