mirror of
https://github.com/k3s-io/k3s.git
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108 lines
3.5 KiB
Go
108 lines
3.5 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package csi
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import (
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"context"
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"errors"
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"fmt"
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api "k8s.io/api/core/v1"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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"k8s.io/klog"
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"k8s.io/kubernetes/pkg/features"
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"k8s.io/kubernetes/pkg/volume"
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"k8s.io/kubernetes/pkg/volume/util"
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)
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var _ volume.NodeExpandableVolumePlugin = &csiPlugin{}
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func (c *csiPlugin) RequiresFSResize() bool {
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// We could check plugin's node capability but we instead are going to rely on
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// NodeExpand to do the right thing and return early if plugin does not have
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// node expansion capability.
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if !utilfeature.DefaultFeatureGate.Enabled(features.ExpandCSIVolumes) {
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klog.V(4).Infof("Resizing is not enabled for CSI volume")
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return false
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}
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return true
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}
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func (c *csiPlugin) NodeExpand(resizeOptions volume.NodeResizeOptions) (bool, error) {
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klog.V(4).Infof(log("Expander.NodeExpand(%s)", resizeOptions.DeviceMountPath))
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csiSource, err := getCSISourceFromSpec(resizeOptions.VolumeSpec)
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if err != nil {
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return false, errors.New(log("Expander.NodeExpand failed to get CSI persistent source: %v", err))
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}
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csClient, err := newCsiDriverClient(csiDriverName(csiSource.Driver))
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if err != nil {
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return false, err
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}
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fsVolume, err := util.CheckVolumeModeFilesystem(resizeOptions.VolumeSpec)
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if err != nil {
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return false, errors.New(log("Expander.NodeExpand failed to check VolumeMode of source: %v", err))
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}
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return c.nodeExpandWithClient(resizeOptions, csiSource, csClient, fsVolume)
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}
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func (c *csiPlugin) nodeExpandWithClient(
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resizeOptions volume.NodeResizeOptions,
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csiSource *api.CSIPersistentVolumeSource,
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csClient csiClient,
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fsVolume bool) (bool, error) {
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driverName := csiSource.Driver
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ctx, cancel := context.WithTimeout(context.Background(), csiTimeout)
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defer cancel()
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nodeExpandSet, err := csClient.NodeSupportsNodeExpand(ctx)
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if err != nil {
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return false, fmt.Errorf("Expander.NodeExpand failed to check if node supports expansion : %v", err)
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}
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if !nodeExpandSet {
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return false, fmt.Errorf("Expander.NodeExpand found CSI plugin %s/%s to not support node expansion", c.GetPluginName(), driverName)
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}
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// Check whether "STAGE_UNSTAGE_VOLUME" is set
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stageUnstageSet, err := csClient.NodeSupportsStageUnstage(ctx)
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if err != nil {
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return false, fmt.Errorf("Expander.NodeExpand failed to check if plugins supports stage_unstage %v", err)
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}
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// if plugin does not support STAGE_UNSTAGE but CSI volume path is staged
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// it must mean this was placeholder staging performed by k8s and not CSI staging
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// in which case we should return from here so as volume can be node published
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// before we can resize
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if !stageUnstageSet && resizeOptions.CSIVolumePhase == volume.CSIVolumeStaged {
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return false, nil
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}
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volumeTargetPath := resizeOptions.DeviceMountPath
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if !fsVolume {
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volumeTargetPath = resizeOptions.DevicePath
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}
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_, err = csClient.NodeExpandVolume(ctx, csiSource.VolumeHandle, volumeTargetPath, resizeOptions.NewSize)
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if err != nil {
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return false, fmt.Errorf("Expander.NodeExpand failed to expand the volume : %v", err)
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}
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return true, nil
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}
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