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[Zhenyu Zheng <zhengzhenyu@xxxxxxxxxx>]

Public bug reported:

In the current "resize instance" implementation, if a instance is booted
from volume, it is allowed to be resize down.

But there are two problems:

1. The current implementation allows resize down with a flavor with smaller 'root_gb' than the volume the instance
booted from. This will cause differences between the actual 'root_gb' size and the one recorded in the data base. 
We shouldn't allow resize down with flavor has less 'root_gb' than the volume.

2. Check if the instance is booted from volume in driver.py is a bad
implementation, we should perform it in API layer.

** Affects: nova
     Importance: Undecided
     Assignee: Zhenyu Zheng (zhengzhenyu)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Zhenyu Zheng (zhengzhenyu)

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https://bugs.launchpad.net/bugs/1459542

Title:
  Move check whether instance is booted from volume from
  libvirt/driver.py to API

Status in OpenStack Compute (Nova):
  New

Bug description:
  In the current "resize instance" implementation, if a instance is
  booted from volume, it is allowed to be resize down.

  But there are two problems:

  1. The current implementation allows resize down with a flavor with smaller 'root_gb' than the volume the instance
  booted from. This will cause differences between the actual 'root_gb' size and the one recorded in the data base. 
  We shouldn't allow resize down with flavor has less 'root_gb' than the volume.

  2. Check if the instance is booted from volume in driver.py is a bad
  implementation, we should perform it in API layer.

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