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Clarify idempotent for ControllerExpandVolume
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Add explicit documentation for clarity idempotent for
ControllerExpandVolume.

Signed-off-by: Xin Wang <[email protected]>
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Xin Wang committed Nov 4, 2019
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Expand Up @@ -1802,6 +1802,8 @@ The CO MUST implement the specified error recovery behavior when it encounters t
A Controller plugin MUST implement this RPC call if plugin has `EXPAND_VOLUME` controller capability.
This RPC allows the CO to expand the size of a volume.

This operation MUST be idempotent. If a volume corresponding to the specified volume ID is larger than or equal to the capacity requirements after expansion, the plugin MUST reply 0 OK.

This call MAY be made by the CO during any time in the lifecycle of the volume after creation if plugin has `VolumeExpansion.ONLINE` capability.
If plugin has `EXPAND_VOLUME` node capability, then `NodeExpandVolume` MUST be called after successful `ControllerExpandVolume` and `node_expansion_required` in `ControllerExpandVolumeResponse` is `true`.

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