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1b1ed1a
(Get the code!)
We have metioned this case in original design [1], there is a common implementation in [2] (if driver not support revert_to_snapshot will call it)
this common implementation will first create a temp volume from snapshot, and then copy temp volume to origin volume [3]
Although If volume.size > snapshot.size, it's a safe case, but we still need shrink volume to snapshot.size (which is not supported in volume dirver)
So, I prefer to add this size check before we do the real revert action.
Link:
[1] https:/
[2] https:/
[3] https:/