fix: update unpublish volume methods to handle mounted state

[EvanCley]

main change

1. Not return error and throw a warning when target mountpoint is not existed in nodeUnpublishVolume.
2. Only do umount when mountpoint exists. If mount error or clean error due to mount, throw errors to block pod terminating.

[gemini-code-assist]

Summary of Changes

Hello @EvanCley, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request improves the robustness of the volume unpublishing process within the CSI driver. It addresses scenarios where unmount operations might fail due to conditions like a non-existent mountpoint or issues during lazy unmounting of static volumes. By logging these errors instead of halting the process, the changes ensure that the unpublish workflow can complete more reliably, preventing unnecessary failures and enhancing the overall stability of volume management.

Highlights

• Robust Unpublishing: The pull request enhances the nodeUnpublishVolume function to ignore errors when the target mountpoint is not found, allowing the unpublish process to proceed gracefully.
• Static Volume Unmount Resilience: Errors encountered during lazy unmount operations for static volumes in nodeUnPublishVolumeStatic are now logged instead of causing the entire operation to fail, improving the resilience of static volume cleanup.

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[gemini-code-assist]

Code Review

This pull request aims to make volume unpublishing more robust by ignoring certain errors. While the intent is good, there are a few areas for improvement.

The changes introduce commented-out code in pkg/service/node.go and pkg/service/node_static.go, which should be removed for code cleanliness.

More importantly, in pkg/service/node_static.go, the change to ignore all errors from mounter.UMount is risky. It can lead to a situation where a volume fails to unmount but is still marked as UMOUNTED, causing state inconsistency. I've suggested an alternative that still avoids blocking pod termination but prevents this inconsistent state by not updating the status on umount failure.

[imeoer]

Additional background: when a pod is deleting, the volume unmount happens during unpublish, if subsequent steps fail, retrying unpublish may allow the pod to be deleted while leaving behind the volume directory.

[imeoer]

Thanks, LGTM!

[BraveY]

LGTM

[gaius-qi]

LGTM