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Add capability for ControllerPublishVolume.readonly field #310

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Nov 9, 2018
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Add capability for ControllerPublishVolume.readonly field #310

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9 changes: 7 additions & 2 deletions csi.proto
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Original file line number Diff line number Diff line change
Expand Up @@ -584,8 +584,10 @@ message ControllerPublishVolumeRequest {
// This is a REQUIRED field.
VolumeCapability volume_capability = 3;

// Whether to publish the volume in readonly mode. This field is
// REQUIRED.
// Whether to publish the volume in readonly mode.
// CO MUST set this field to false if SP does not have the
// PUBLISH_READONLY controller capability.
// This is a REQUIRED field.
bool readonly = 4;
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Is making readonly flag optional simpler?

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Problem with making it optional is that the CO doesn't know when to set it. If CO sets it to true and a plugin doesn't support it, what happens? Consider the case where the CO uses the same flag for both ControllerPublish and NodePublish readonly -- we don't want to get in to a case where the CO thinks a volume is readonly but it's not.


// Secrets required by plugin to complete controller publish volume
Expand Down Expand Up @@ -776,6 +778,9 @@ message ControllerServiceCapability {
// the same plugin. Not all volume sources and parameters
// combinations may work.
CLONE_VOLUME = 7;
// Indicates the SP supports ControllerPublishVolume.readonly
// field.
PUBLISH_READONLY = 8;
}

Type type = 1;
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