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0e1f616
(Get the code!)
The kernel should (imo) return -EBUSY when when asked to disconnect a mounted nbd device. It'd be trivial to do. But consensus is that it'd be refused because it should behave like all other disks.
Kvm's qemu-nbd.c *could* detect the condition as well. But the check there would be racy.
So we will propose a patch to have nova refuse the disconnect if the device is busy.