You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: csi_block.go
    path of file: ./repos/kubernetes/pkg/volume/csi
    
    the code of the file until where you have to start completion: /*
Copyright 2018 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    h
    
func (m *csiBlockMapper) unstageVolumeForBlock(ctx context.Context, csi csiClient, stagingPath string) error {
	// Check whether "STAGE_UNSTAGE_VOLUME" is set
	stageUnstageSet, err := csi.NodeSupportsStageUnstage(ctx)
	if err != nil {
		return errors.New(log("blockMapper.unstageVolumeForBlock failed to check STAGE_UNSTAGE_VOLUME capability: %v", err))
	}
	if !stageUnstageSet {
		klog.Infof(log("blockMapper.unstageVolumeForBlock STAGE_UNSTAGE_VOLUME capability not set. Skipping unstageVolumeForBlock ..."))
		return nil
	}

	// Request to unstage a block volume from stagingPath.
	// Expected implementation for driver is removing driver specific resource in stagingPath and
	// detaching the block volume from the node.
	if err := csi.NodeUnstageVolume(ctx, m.volumeID, stagingPath); err != nil {
		return errors.New(log("blockMapper.unstageVolumeForBlock failed: %v", err))
	}
	klog.V(4).Infof(log("blockMapper.unstageVolumeForBlock NodeUnstageVolume successfully [%s]", stagingPath))

	// Remove stagingPath directory and its contents
	if err := os.RemoveAll(stagingPath); err != nil {
		return errors.New(log("blockMapper.unstageVolumeForBlock failed to remove staging path after NodeUnstageVolume() error [%s]: %v", stagingPath, err))
	}

	return nil
}