Block resize operations that reduce disk capacity

Registered by Phil Day on 2014-06-18

Current hypervisors have a range of checks against reduction in disk size for resize operations, ranging from checking root and ephemeral to not checking at all. Because these checks are only implemented at the driver level failures can not be detected by the user (the instance remains active). Resize to a smaller disk can never work if the user already has more data than the new flavor allows - so for consistency any resize to a smaller flavour should be treated as an error.

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Drafter:
Phil Day
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Needs approval
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Definition:
New
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Unknown
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