equivalent to "-drive if=ide,id=disk0....."

[Derek Su]

Hello,

I'm trying to replace "-drive if=ide,id=disk0....." with "-blockdev
'{"node-name": "top-node",...."
The "id" is the name of BlockBackend, and the "node-name" is the name
of the BDS tree's root.
Is there any equivalent for "id" when use "-blockdev '{"node-name":
"top-node",...." ?
Thanks.

Regards,
Derek