Ceph rbd support in-use extend

Registered by yenai

Ceph rbd now is not able to do extending when the volume is in-use.
Nova will raise NotImplementedError, the VM cann't know the new size except reboot.
This is intolerable in a production environment.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
yenai
Direction:
Needs approval
Assignee:
Gorka Eguileor
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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