Hi,all:
    1)I have cloned an image named "vm-win7" from snapshot named 
"template-win7_snapshot"
    #rbd clone template-pool/template-win7@template-win7_snapshot 
template-pool/vm-win7


    2) i want to copy the cloned rbd "vm-win7" to a new one
    #rbd copy template-pool/vm-win7 template-pool/vm-win7_copy


    3) I found vm-win7_copy doesn't include parent infomation while vm-win7 
does!
    #[root@host111 ~]# rbd info vm-win7_copy --pool template-pool
    rbd image 'vm-win7_copy':
    size 20480 MB in 5120 objects
    order 22 (4096 kB objects)
    block_name_prefix: rbd_data.858a6b8b4567
    format: 2
    features: layering
    flags:


    #[root@host111 ~]# rbd info vm-win7 --pool template-pool
    rbd image 'vm-win7':
    size 20480 MB in 5120 objects
    order 22 (4096 kB objects)
    block_name_prefix: rbd_data.85846b8b4567
    format: 2
    features: layering
    flags:
    parent: template-pool/template-win7@template-win7_snapshot
    overlap: 20480 MB


so i want to know how to get a copy of a cloned rbd including its parent 
infomation?
maybe i should use another command except "rbd copy"?
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