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operation_generator.go
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operation_generator.go
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/*
Copyright 2016 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
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package operationexecutor
import (
"context"
goerrors "errors"
"fmt"
"os"
"path/filepath"
"strings"
"time"
"k8s.io/apimachinery/pkg/api/resource"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
utilfeature "k8s.io/apiserver/pkg/util/feature"
clientset "k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/record"
volerr "k8s.io/cloud-provider/volume/errors"
storagehelpers "k8s.io/component-helpers/storage/volume"
csitrans "k8s.io/csi-translation-lib"
"k8s.io/klog/v2"
v1helper "k8s.io/kubernetes/pkg/apis/core/v1/helper"
"k8s.io/kubernetes/pkg/features"
kevents "k8s.io/kubernetes/pkg/kubelet/events"
"k8s.io/kubernetes/pkg/volume"
"k8s.io/kubernetes/pkg/volume/util"
"k8s.io/kubernetes/pkg/volume/util/hostutil"
volumetypes "k8s.io/kubernetes/pkg/volume/util/types"
"k8s.io/kubernetes/pkg/volume/util/volumepathhandler"
)
const (
unknownVolumePlugin string = "UnknownVolumePlugin"
unknownAttachableVolumePlugin string = "UnknownAttachableVolumePlugin"
DetachOperationName string = "volume_detach"
VerifyControllerAttachedVolumeOpName string = "verify_controller_attached_volume"
)
// InTreeToCSITranslator contains methods required to check migratable status
// and perform translations from InTree PVs and Inline to CSI
type InTreeToCSITranslator interface {
IsPVMigratable(pv *v1.PersistentVolume) bool
IsInlineMigratable(vol *v1.Volume) bool
IsMigratableIntreePluginByName(inTreePluginName string) bool
GetInTreePluginNameFromSpec(pv *v1.PersistentVolume, vol *v1.Volume) (string, error)
GetCSINameFromInTreeName(pluginName string) (string, error)
TranslateInTreePVToCSI(pv *v1.PersistentVolume) (*v1.PersistentVolume, error)
TranslateInTreeInlineVolumeToCSI(volume *v1.Volume, podNamespace string) (*v1.PersistentVolume, error)
}
var _ OperationGenerator = &operationGenerator{}
type operationGenerator struct {
// Used to fetch objects from the API server like Node in the
// VerifyControllerAttachedVolume operation.
kubeClient clientset.Interface
// volumePluginMgr is the volume plugin manager used to create volume
// plugin objects.
volumePluginMgr *volume.VolumePluginMgr
// recorder is used to record events in the API server
recorder record.EventRecorder
// blkUtil provides volume path related operations for block volume
blkUtil volumepathhandler.BlockVolumePathHandler
translator InTreeToCSITranslator
}
type inTreeResizeResponse struct {
pvc *v1.PersistentVolumeClaim
pv *v1.PersistentVolume
err error
// indicates that resize operation was called on underlying volume driver
// mainly useful for testing.
resizeCalled bool
}
// NewOperationGenerator is returns instance of operationGenerator
func NewOperationGenerator(kubeClient clientset.Interface,
volumePluginMgr *volume.VolumePluginMgr,
recorder record.EventRecorder,
blkUtil volumepathhandler.BlockVolumePathHandler) OperationGenerator {
return &operationGenerator{
kubeClient: kubeClient,
volumePluginMgr: volumePluginMgr,
recorder: recorder,
blkUtil: blkUtil,
translator: csitrans.New(),
}
}
// OperationGenerator interface that extracts out the functions from operation_executor to make it dependency injectable
type OperationGenerator interface {
// Generates the MountVolume function needed to perform the mount of a volume plugin
GenerateMountVolumeFunc(waitForAttachTimeout time.Duration, volumeToMount VolumeToMount, actualStateOfWorldMounterUpdater ActualStateOfWorldMounterUpdater, isRemount bool) volumetypes.GeneratedOperations
// Generates the UnmountVolume function needed to perform the unmount of a volume plugin
GenerateUnmountVolumeFunc(volumeToUnmount MountedVolume, actualStateOfWorld ActualStateOfWorldMounterUpdater, podsDir string) (volumetypes.GeneratedOperations, error)
// Generates the AttachVolume function needed to perform attach of a volume plugin
GenerateAttachVolumeFunc(volumeToAttach VolumeToAttach, actualStateOfWorld ActualStateOfWorldAttacherUpdater) volumetypes.GeneratedOperations
// Generates the DetachVolume function needed to perform the detach of a volume plugin
GenerateDetachVolumeFunc(volumeToDetach AttachedVolume, verifySafeToDetach bool, actualStateOfWorld ActualStateOfWorldAttacherUpdater) (volumetypes.GeneratedOperations, error)
// Generates the VolumesAreAttached function needed to verify if volume plugins are attached
GenerateVolumesAreAttachedFunc(attachedVolumes []AttachedVolume, nodeName types.NodeName, actualStateOfWorld ActualStateOfWorldAttacherUpdater) (volumetypes.GeneratedOperations, error)
// Generates the UnMountDevice function needed to perform the unmount of a device
GenerateUnmountDeviceFunc(deviceToDetach AttachedVolume, actualStateOfWorld ActualStateOfWorldMounterUpdater, mounter hostutil.HostUtils) (volumetypes.GeneratedOperations, error)
// Generates the function needed to check if the attach_detach controller has attached the volume plugin
GenerateVerifyControllerAttachedVolumeFunc(volumeToMount VolumeToMount, nodeName types.NodeName, actualStateOfWorld ActualStateOfWorldAttacherUpdater) (volumetypes.GeneratedOperations, error)
// Generates the MapVolume function needed to perform the map of a volume plugin
GenerateMapVolumeFunc(waitForAttachTimeout time.Duration, volumeToMount VolumeToMount, actualStateOfWorldMounterUpdater ActualStateOfWorldMounterUpdater) (volumetypes.GeneratedOperations, error)
// Generates the UnmapVolume function needed to perform the unmap of a volume plugin
GenerateUnmapVolumeFunc(volumeToUnmount MountedVolume, actualStateOfWorld ActualStateOfWorldMounterUpdater) (volumetypes.GeneratedOperations, error)
// Generates the UnmapDevice function needed to perform the unmap of a device
GenerateUnmapDeviceFunc(deviceToDetach AttachedVolume, actualStateOfWorld ActualStateOfWorldMounterUpdater, mounter hostutil.HostUtils) (volumetypes.GeneratedOperations, error)
// GetVolumePluginMgr returns volume plugin manager
GetVolumePluginMgr() *volume.VolumePluginMgr
// GetCSITranslator returns the CSI Translation Library
GetCSITranslator() InTreeToCSITranslator
GenerateBulkVolumeVerifyFunc(
map[types.NodeName][]*volume.Spec,
string,
map[*volume.Spec]v1.UniqueVolumeName, ActualStateOfWorldAttacherUpdater) (volumetypes.GeneratedOperations, error)
GenerateExpandVolumeFunc(*v1.PersistentVolumeClaim, *v1.PersistentVolume) (volumetypes.GeneratedOperations, error)
GenerateExpandAndRecoverVolumeFunc(*v1.PersistentVolumeClaim, *v1.PersistentVolume, string) (volumetypes.GeneratedOperations, error)
// Generates the volume file system resize function, which can resize volume's file system to expected size without unmounting the volume.
// Along with volumeToMount and actualStateOfWorld, the function expects current size of volume on the node as an argument. The current
// size here always refers to capacity last recorded in actualStateOfWorld from pvc.Status.Capacity
GenerateExpandInUseVolumeFunc(volumeToMount VolumeToMount, actualStateOfWorld ActualStateOfWorldMounterUpdater, currentSize resource.Quantity) (volumetypes.GeneratedOperations, error)
}
type inTreeResizeOpts struct {
resizerName string
pvc *v1.PersistentVolumeClaim
pv *v1.PersistentVolume
volumeSpec *volume.Spec
volumePlugin volume.ExpandableVolumePlugin
}
type nodeResizeOperationOpts struct {
vmt VolumeToMount
pvc *v1.PersistentVolumeClaim
pv *v1.PersistentVolume
pluginResizeOpts volume.NodeResizeOptions
volumePlugin volume.NodeExpandableVolumePlugin
actualStateOfWorld ActualStateOfWorldMounterUpdater
}
func (og *operationGenerator) GenerateVolumesAreAttachedFunc(
attachedVolumes []AttachedVolume,
nodeName types.NodeName,
actualStateOfWorld ActualStateOfWorldAttacherUpdater) (volumetypes.GeneratedOperations, error) {
// volumesPerPlugin maps from a volume plugin to a list of volume specs which belong
// to this type of plugin
volumesPerPlugin := make(map[string][]*volume.Spec)
// volumeSpecMap maps from a volume spec to its unique volumeName which will be used
// when calling MarkVolumeAsDetached
volumeSpecMap := make(map[*volume.Spec]v1.UniqueVolumeName)
// Iterate each volume spec and put them into a map index by the pluginName
for _, volumeAttached := range attachedVolumes {
if volumeAttached.VolumeSpec == nil {
klog.Errorf("VerifyVolumesAreAttached.GenerateVolumesAreAttachedFunc: nil spec for volume %s", volumeAttached.VolumeName)
continue
}
volumePlugin, err :=
og.volumePluginMgr.FindPluginBySpec(volumeAttached.VolumeSpec)
if err != nil || volumePlugin == nil {
klog.Errorf(volumeAttached.GenerateErrorDetailed("VolumesAreAttached.FindPluginBySpec failed", err).Error())
continue
}
volumeSpecList, pluginExists := volumesPerPlugin[volumePlugin.GetPluginName()]
if !pluginExists {
volumeSpecList = []*volume.Spec{}
}
volumeSpecList = append(volumeSpecList, volumeAttached.VolumeSpec)
volumesPerPlugin[volumePlugin.GetPluginName()] = volumeSpecList
// Migration: VolumeSpecMap contains original VolumeName for use in ActualStateOfWorld
volumeSpecMap[volumeAttached.VolumeSpec] = volumeAttached.VolumeName
}
volumesAreAttachedFunc := func() volumetypes.OperationContext {
// For each volume plugin, pass the list of volume specs to VolumesAreAttached to check
// whether the volumes are still attached.
for pluginName, volumesSpecs := range volumesPerPlugin {
attachableVolumePlugin, err :=
og.volumePluginMgr.FindAttachablePluginByName(pluginName)
if err != nil || attachableVolumePlugin == nil {
klog.Errorf(
"VolumeAreAttached.FindAttachablePluginBySpec failed for plugin %q with: %v",
pluginName,
err)
continue
}
volumeAttacher, newAttacherErr := attachableVolumePlugin.NewAttacher()
if newAttacherErr != nil {
klog.Errorf(
"VolumesAreAttached.NewAttacher failed for getting plugin %q with: %v",
pluginName,
newAttacherErr)
continue
}
attached, areAttachedErr := volumeAttacher.VolumesAreAttached(volumesSpecs, nodeName)
if areAttachedErr != nil {
klog.Errorf(
"VolumesAreAttached failed for checking on node %q with: %v",
nodeName,
areAttachedErr)
continue
}
for spec, check := range attached {
if !check {
actualStateOfWorld.MarkVolumeAsDetached(volumeSpecMap[spec], nodeName)
klog.V(1).Infof("VerifyVolumesAreAttached determined volume %q (spec.Name: %q) is no longer attached to node %q, therefore it was marked as detached.",
volumeSpecMap[spec], spec.Name(), nodeName)
}
}
}
// It is hard to differentiate migrated status for all volumes for verify_volumes_are_attached_per_node
return volumetypes.NewOperationContext(nil, nil, false)
}
return volumetypes.GeneratedOperations{
OperationName: "verify_volumes_are_attached_per_node",
OperationFunc: volumesAreAttachedFunc,
CompleteFunc: util.OperationCompleteHook(util.GetFullQualifiedPluginNameForVolume("<n/a>", nil), "verify_volumes_are_attached_per_node"),
EventRecorderFunc: nil, // nil because we do not want to generate event on error
}, nil
}
func (og *operationGenerator) GenerateBulkVolumeVerifyFunc(
pluginNodeVolumes map[types.NodeName][]*volume.Spec,
pluginName string,
volumeSpecMap map[*volume.Spec]v1.UniqueVolumeName,
actualStateOfWorld ActualStateOfWorldAttacherUpdater) (volumetypes.GeneratedOperations, error) {
// Migration: All inputs already should be translated by caller for this
// function except volumeSpecMap which contains original volume names for
// use with actualStateOfWorld
bulkVolumeVerifyFunc := func() volumetypes.OperationContext {
attachableVolumePlugin, err :=
og.volumePluginMgr.FindAttachablePluginByName(pluginName)
if err != nil || attachableVolumePlugin == nil {
klog.Errorf(
"BulkVerifyVolume.FindAttachablePluginBySpec failed for plugin %q with: %v",
pluginName,
err)
return volumetypes.NewOperationContext(nil, nil, false)
}
volumeAttacher, newAttacherErr := attachableVolumePlugin.NewAttacher()
if newAttacherErr != nil {
klog.Errorf(
"BulkVerifyVolume.NewAttacher failed for getting plugin %q with: %v",
attachableVolumePlugin,
newAttacherErr)
return volumetypes.NewOperationContext(nil, nil, false)
}
bulkVolumeVerifier, ok := volumeAttacher.(volume.BulkVolumeVerifier)
if !ok {
klog.Errorf("BulkVerifyVolume failed to type assert attacher %q", bulkVolumeVerifier)
return volumetypes.NewOperationContext(nil, nil, false)
}
attached, bulkAttachErr := bulkVolumeVerifier.BulkVerifyVolumes(pluginNodeVolumes)
if bulkAttachErr != nil {
klog.Errorf("BulkVerifyVolume.BulkVerifyVolumes Error checking volumes are attached with %v", bulkAttachErr)
return volumetypes.NewOperationContext(nil, nil, false)
}
for nodeName, volumeSpecs := range pluginNodeVolumes {
for _, volumeSpec := range volumeSpecs {
nodeVolumeSpecs, nodeChecked := attached[nodeName]
if !nodeChecked {
klog.V(2).Infof("VerifyVolumesAreAttached.BulkVerifyVolumes failed for node %q and leaving volume %q as attached",
nodeName,
volumeSpec.Name())
continue
}
check := nodeVolumeSpecs[volumeSpec]
if !check {
klog.V(2).Infof("VerifyVolumesAreAttached.BulkVerifyVolumes failed for node %q and volume %q",
nodeName,
volumeSpec.Name())
actualStateOfWorld.MarkVolumeAsDetached(volumeSpecMap[volumeSpec], nodeName)
}
}
}
// It is hard to differentiate migrated status for all volumes for verify_volumes_are_attached
return volumetypes.NewOperationContext(nil, nil, false)
}
return volumetypes.GeneratedOperations{
OperationName: "verify_volumes_are_attached",
OperationFunc: bulkVolumeVerifyFunc,
CompleteFunc: util.OperationCompleteHook(util.GetFullQualifiedPluginNameForVolume(pluginName, nil), "verify_volumes_are_attached"),
EventRecorderFunc: nil, // nil because we do not want to generate event on error
}, nil
}
func (og *operationGenerator) GenerateAttachVolumeFunc(
volumeToAttach VolumeToAttach,
actualStateOfWorld ActualStateOfWorldAttacherUpdater) volumetypes.GeneratedOperations {
attachVolumeFunc := func() volumetypes.OperationContext {
attachableVolumePlugin, err :=
og.volumePluginMgr.FindAttachablePluginBySpec(volumeToAttach.VolumeSpec)
migrated := getMigratedStatusBySpec(volumeToAttach.VolumeSpec)
if err != nil || attachableVolumePlugin == nil {
eventErr, detailedErr := volumeToAttach.GenerateError("AttachVolume.FindAttachablePluginBySpec failed", err)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
volumeAttacher, newAttacherErr := attachableVolumePlugin.NewAttacher()
if newAttacherErr != nil {
eventErr, detailedErr := volumeToAttach.GenerateError("AttachVolume.NewAttacher failed", newAttacherErr)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
// Execute attach
devicePath, attachErr := volumeAttacher.Attach(
volumeToAttach.VolumeSpec, volumeToAttach.NodeName)
if attachErr != nil {
uncertainNode := volumeToAttach.NodeName
if derr, ok := attachErr.(*volerr.DanglingAttachError); ok {
uncertainNode = derr.CurrentNode
}
addErr := actualStateOfWorld.MarkVolumeAsUncertain(
volumeToAttach.VolumeName,
volumeToAttach.VolumeSpec,
uncertainNode)
if addErr != nil {
klog.Errorf("AttachVolume.MarkVolumeAsUncertain fail to add the volume %q to actual state with %s", volumeToAttach.VolumeName, addErr)
}
// On failure, return error. Caller will log and retry.
eventErr, detailedErr := volumeToAttach.GenerateError("AttachVolume.Attach failed", attachErr)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
// Successful attach event is useful for user debugging
simpleMsg, _ := volumeToAttach.GenerateMsg("AttachVolume.Attach succeeded", "")
for _, pod := range volumeToAttach.ScheduledPods {
og.recorder.Eventf(pod, v1.EventTypeNormal, kevents.SuccessfulAttachVolume, simpleMsg)
}
klog.Infof(volumeToAttach.GenerateMsgDetailed("AttachVolume.Attach succeeded", ""))
// Update actual state of world
addVolumeNodeErr := actualStateOfWorld.MarkVolumeAsAttached(
v1.UniqueVolumeName(""), volumeToAttach.VolumeSpec, volumeToAttach.NodeName, devicePath)
if addVolumeNodeErr != nil {
// On failure, return error. Caller will log and retry.
eventErr, detailedErr := volumeToAttach.GenerateError("AttachVolume.MarkVolumeAsAttached failed", addVolumeNodeErr)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
return volumetypes.NewOperationContext(nil, nil, migrated)
}
eventRecorderFunc := func(err *error) {
if *err != nil {
for _, pod := range volumeToAttach.ScheduledPods {
og.recorder.Eventf(pod, v1.EventTypeWarning, kevents.FailedAttachVolume, (*err).Error())
}
}
}
attachableVolumePluginName := unknownAttachableVolumePlugin
// Get attacher plugin
attachableVolumePlugin, err :=
og.volumePluginMgr.FindAttachablePluginBySpec(volumeToAttach.VolumeSpec)
// It's ok to ignore the error, returning error is not expected from this function.
// If an error case occurred during the function generation, this error case(skipped one) will also trigger an error
// while the generated function is executed. And those errors will be handled during the execution of the generated
// function with a back off policy.
if err == nil && attachableVolumePlugin != nil {
attachableVolumePluginName = attachableVolumePlugin.GetPluginName()
}
return volumetypes.GeneratedOperations{
OperationName: "volume_attach",
OperationFunc: attachVolumeFunc,
EventRecorderFunc: eventRecorderFunc,
CompleteFunc: util.OperationCompleteHook(util.GetFullQualifiedPluginNameForVolume(attachableVolumePluginName, volumeToAttach.VolumeSpec), "volume_attach"),
}
}
func (og *operationGenerator) GetVolumePluginMgr() *volume.VolumePluginMgr {
return og.volumePluginMgr
}
func (og *operationGenerator) GetCSITranslator() InTreeToCSITranslator {
return og.translator
}
func (og *operationGenerator) GenerateDetachVolumeFunc(
volumeToDetach AttachedVolume,
verifySafeToDetach bool,
actualStateOfWorld ActualStateOfWorldAttacherUpdater) (volumetypes.GeneratedOperations, error) {
var volumeName string
var attachableVolumePlugin volume.AttachableVolumePlugin
var pluginName string
var err error
if volumeToDetach.VolumeSpec != nil {
attachableVolumePlugin, err = findDetachablePluginBySpec(volumeToDetach.VolumeSpec, og.volumePluginMgr)
if err != nil || attachableVolumePlugin == nil {
return volumetypes.GeneratedOperations{}, volumeToDetach.GenerateErrorDetailed("DetachVolume.findDetachablePluginBySpec failed", err)
}
volumeName, err =
attachableVolumePlugin.GetVolumeName(volumeToDetach.VolumeSpec)
if err != nil {
return volumetypes.GeneratedOperations{}, volumeToDetach.GenerateErrorDetailed("DetachVolume.GetVolumeName failed", err)
}
} else {
// Get attacher plugin and the volumeName by splitting the volume unique name in case
// there's no VolumeSpec: this happens only on attach/detach controller crash recovery
// when a pod has been deleted during the controller downtime
pluginName, volumeName, err = util.SplitUniqueName(volumeToDetach.VolumeName)
if err != nil {
return volumetypes.GeneratedOperations{}, volumeToDetach.GenerateErrorDetailed("DetachVolume.SplitUniqueName failed", err)
}
attachableVolumePlugin, err = og.volumePluginMgr.FindAttachablePluginByName(pluginName)
if err != nil || attachableVolumePlugin == nil {
return volumetypes.GeneratedOperations{}, volumeToDetach.GenerateErrorDetailed("DetachVolume.FindAttachablePluginByName failed", err)
}
}
if pluginName == "" {
pluginName = attachableVolumePlugin.GetPluginName()
}
volumeDetacher, err := attachableVolumePlugin.NewDetacher()
if err != nil {
return volumetypes.GeneratedOperations{}, volumeToDetach.GenerateErrorDetailed("DetachVolume.NewDetacher failed", err)
}
detachVolumeFunc := func() volumetypes.OperationContext {
var err error
if verifySafeToDetach {
err = og.verifyVolumeIsSafeToDetach(volumeToDetach)
}
if err == nil {
err = volumeDetacher.Detach(volumeName, volumeToDetach.NodeName)
}
migrated := getMigratedStatusBySpec(volumeToDetach.VolumeSpec)
if err != nil {
// On failure, add volume back to ReportAsAttached list
actualStateOfWorld.AddVolumeToReportAsAttached(
volumeToDetach.VolumeName, volumeToDetach.NodeName)
eventErr, detailedErr := volumeToDetach.GenerateError("DetachVolume.Detach failed", err)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
klog.Infof(volumeToDetach.GenerateMsgDetailed("DetachVolume.Detach succeeded", ""))
// Update actual state of world
actualStateOfWorld.MarkVolumeAsDetached(
volumeToDetach.VolumeName, volumeToDetach.NodeName)
return volumetypes.NewOperationContext(nil, nil, migrated)
}
return volumetypes.GeneratedOperations{
OperationName: DetachOperationName,
OperationFunc: detachVolumeFunc,
CompleteFunc: util.OperationCompleteHook(util.GetFullQualifiedPluginNameForVolume(pluginName, volumeToDetach.VolumeSpec), DetachOperationName),
EventRecorderFunc: nil, // nil because we do not want to generate event on error
}, nil
}
func (og *operationGenerator) GenerateMountVolumeFunc(
waitForAttachTimeout time.Duration,
volumeToMount VolumeToMount,
actualStateOfWorld ActualStateOfWorldMounterUpdater,
isRemount bool) volumetypes.GeneratedOperations {
volumePluginName := unknownVolumePlugin
volumePlugin, err :=
og.volumePluginMgr.FindPluginBySpec(volumeToMount.VolumeSpec)
if err == nil && volumePlugin != nil {
volumePluginName = volumePlugin.GetPluginName()
}
mountVolumeFunc := func() volumetypes.OperationContext {
// Get mounter plugin
volumePlugin, err := og.volumePluginMgr.FindPluginBySpec(volumeToMount.VolumeSpec)
migrated := getMigratedStatusBySpec(volumeToMount.VolumeSpec)
if err != nil || volumePlugin == nil {
eventErr, detailedErr := volumeToMount.GenerateError("MountVolume.FindPluginBySpec failed", err)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
affinityErr := checkNodeAffinity(og, volumeToMount)
if affinityErr != nil {
eventErr, detailedErr := volumeToMount.GenerateError("MountVolume.NodeAffinity check failed", affinityErr)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
volumeMounter, newMounterErr := volumePlugin.NewMounter(
volumeToMount.VolumeSpec,
volumeToMount.Pod,
volume.VolumeOptions{})
if newMounterErr != nil {
eventErr, detailedErr := volumeToMount.GenerateError("MountVolume.NewMounter initialization failed", newMounterErr)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
mountCheckError := checkMountOptionSupport(og, volumeToMount, volumePlugin)
if mountCheckError != nil {
eventErr, detailedErr := volumeToMount.GenerateError("MountVolume.MountOptionSupport check failed", mountCheckError)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
// Enforce ReadWriteOncePod access mode if it is the only one present. This is also enforced during scheduling.
if utilfeature.DefaultFeatureGate.Enabled(features.ReadWriteOncePod) &&
actualStateOfWorld.IsVolumeMountedElsewhere(volumeToMount.VolumeName, volumeToMount.PodName) &&
// Because we do not know what access mode the pod intends to use if there are multiple.
len(volumeToMount.VolumeSpec.PersistentVolume.Spec.AccessModes) == 1 &&
v1helper.ContainsAccessMode(volumeToMount.VolumeSpec.PersistentVolume.Spec.AccessModes, v1.ReadWriteOncePod) {
err = goerrors.New("volume uses the ReadWriteOncePod access mode and is already in use by another pod")
eventErr, detailedErr := volumeToMount.GenerateError("MountVolume.SetUp failed", err)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
// Get attacher, if possible
attachableVolumePlugin, _ :=
og.volumePluginMgr.FindAttachablePluginBySpec(volumeToMount.VolumeSpec)
var volumeAttacher volume.Attacher
if attachableVolumePlugin != nil {
volumeAttacher, _ = attachableVolumePlugin.NewAttacher()
}
// get deviceMounter, if possible
deviceMountableVolumePlugin, _ := og.volumePluginMgr.FindDeviceMountablePluginBySpec(volumeToMount.VolumeSpec)
var volumeDeviceMounter volume.DeviceMounter
if deviceMountableVolumePlugin != nil {
volumeDeviceMounter, _ = deviceMountableVolumePlugin.NewDeviceMounter()
}
var fsGroup *int64
var fsGroupChangePolicy *v1.PodFSGroupChangePolicy
if podSc := volumeToMount.Pod.Spec.SecurityContext; podSc != nil {
if podSc.FSGroup != nil {
fsGroup = podSc.FSGroup
}
if podSc.FSGroupChangePolicy != nil {
fsGroupChangePolicy = podSc.FSGroupChangePolicy
}
}
devicePath := volumeToMount.DevicePath
if volumeAttacher != nil {
// Wait for attachable volumes to finish attaching
klog.InfoS(volumeToMount.GenerateMsgDetailed("MountVolume.WaitForAttach entering", fmt.Sprintf("DevicePath %q", volumeToMount.DevicePath)), "pod", klog.KObj(volumeToMount.Pod))
devicePath, err = volumeAttacher.WaitForAttach(
volumeToMount.VolumeSpec, devicePath, volumeToMount.Pod, waitForAttachTimeout)
if err != nil {
// On failure, return error. Caller will log and retry.
eventErr, detailedErr := volumeToMount.GenerateError("MountVolume.WaitForAttach failed", err)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
klog.InfoS(volumeToMount.GenerateMsgDetailed("MountVolume.WaitForAttach succeeded", fmt.Sprintf("DevicePath %q", devicePath)), "pod", klog.KObj(volumeToMount.Pod))
}
var resizeError error
resizeOptions := volume.NodeResizeOptions{
DevicePath: devicePath,
}
if volumeDeviceMounter != nil && actualStateOfWorld.GetDeviceMountState(volumeToMount.VolumeName) != DeviceGloballyMounted {
deviceMountPath, err :=
volumeDeviceMounter.GetDeviceMountPath(volumeToMount.VolumeSpec)
if err != nil {
// On failure, return error. Caller will log and retry.
eventErr, detailedErr := volumeToMount.GenerateError("MountVolume.GetDeviceMountPath failed", err)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
// Mount device to global mount path
err = volumeDeviceMounter.MountDevice(
volumeToMount.VolumeSpec,
devicePath,
deviceMountPath,
volume.DeviceMounterArgs{FsGroup: fsGroup},
)
if err != nil {
og.addFailedMountEvent(volumeToMount, err)
og.markDeviceErrorState(volumeToMount, devicePath, deviceMountPath, err, actualStateOfWorld)
// On failure, return error. Caller will log and retry.
eventErr, detailedErr := volumeToMount.GenerateError("MountVolume.MountDevice failed", err)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
klog.InfoS(volumeToMount.GenerateMsgDetailed("MountVolume.MountDevice succeeded", fmt.Sprintf("device mount path %q", deviceMountPath)), "pod", klog.KObj(volumeToMount.Pod))
// Update actual state of world to reflect volume is globally mounted
markDeviceMountedErr := actualStateOfWorld.MarkDeviceAsMounted(
volumeToMount.VolumeName, devicePath, deviceMountPath)
if markDeviceMountedErr != nil {
// On failure, return error. Caller will log and retry.
eventErr, detailedErr := volumeToMount.GenerateError("MountVolume.MarkDeviceAsMounted failed", markDeviceMountedErr)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
// set staging path for volume expansion
resizeOptions.DeviceStagePath = deviceMountPath
}
// Execute mount
mountErr := volumeMounter.SetUp(volume.MounterArgs{
FsUser: util.FsUserFrom(volumeToMount.Pod),
FsGroup: fsGroup,
DesiredSize: volumeToMount.DesiredSizeLimit,
FSGroupChangePolicy: fsGroupChangePolicy,
})
// Update actual state of world
markOpts := MarkVolumeOpts{
PodName: volumeToMount.PodName,
PodUID: volumeToMount.Pod.UID,
VolumeName: volumeToMount.VolumeName,
Mounter: volumeMounter,
OuterVolumeSpecName: volumeToMount.OuterVolumeSpecName,
VolumeGidVolume: volumeToMount.VolumeGidValue,
VolumeSpec: volumeToMount.VolumeSpec,
VolumeMountState: VolumeMounted,
}
if mountErr != nil {
og.addFailedMountEvent(volumeToMount, mountErr)
og.markVolumeErrorState(volumeToMount, markOpts, actualStateOfWorld)
// On failure, return error. Caller will log and retry.
eventErr, detailedErr := volumeToMount.GenerateError("MountVolume.SetUp failed", mountErr)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
detailedMsg := volumeToMount.GenerateMsgDetailed("MountVolume.SetUp succeeded", "")
verbosity := klog.Level(1)
if isRemount {
verbosity = klog.Level(4)
}
klog.V(verbosity).InfoS(detailedMsg, "pod", klog.KObj(volumeToMount.Pod))
resizeOptions.DeviceMountPath = volumeMounter.GetPath()
_, resizeError = og.expandVolumeDuringMount(volumeToMount, actualStateOfWorld, resizeOptions)
if resizeError != nil {
klog.Errorf("MountVolume.NodeExpandVolume failed with %v", resizeError)
eventErr, detailedErr := volumeToMount.GenerateError("MountVolume.Setup failed while expanding volume", resizeError)
// At this point, MountVolume.Setup already succeeded, we should add volume into actual state
// so that reconciler can clean up volume when needed. However, volume resize failed,
// we should not mark the volume as mounted to avoid pod starts using it.
// Considering the above situations, we mark volume as uncertain here so that reconciler will tigger
// volume tear down when pod is deleted, and also makes sure pod will not start using it.
if err := actualStateOfWorld.MarkVolumeMountAsUncertain(markOpts); err != nil {
klog.Errorf(volumeToMount.GenerateErrorDetailed("MountVolume.MarkVolumeMountAsUncertain failed", err).Error())
}
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
// record total time it takes to mount a volume. This is end to end time that includes waiting for volume to attach, node to be update
// plugin call to succeed
mountRequestTime := volumeToMount.MountRequestTime
totalTimeTaken := time.Since(mountRequestTime).Seconds()
util.RecordOperationLatencyMetric(util.GetFullQualifiedPluginNameForVolume(volumePluginName, volumeToMount.VolumeSpec), "overall_volume_mount", totalTimeTaken)
markVolMountedErr := actualStateOfWorld.MarkVolumeAsMounted(markOpts)
if markVolMountedErr != nil {
// On failure, return error. Caller will log and retry.
eventErr, detailedErr := volumeToMount.GenerateError("MountVolume.MarkVolumeAsMounted failed", markVolMountedErr)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
return volumetypes.NewOperationContext(nil, nil, migrated)
}
eventRecorderFunc := func(err *error) {
if *err != nil {
og.recorder.Eventf(volumeToMount.Pod, v1.EventTypeWarning, kevents.FailedMountVolume, (*err).Error())
}
}
return volumetypes.GeneratedOperations{
OperationName: "volume_mount",
OperationFunc: mountVolumeFunc,
EventRecorderFunc: eventRecorderFunc,
CompleteFunc: util.OperationCompleteHook(util.GetFullQualifiedPluginNameForVolume(volumePluginName, volumeToMount.VolumeSpec), "volume_mount"),
}
}
func (og *operationGenerator) addFailedMountEvent(volumeToMount VolumeToMount, mountError error) {
pv := volumeToMount.VolumeSpec.PersistentVolume
if pv == nil {
return
}
if volumetypes.IsFilesystemMismatchError(mountError) {
simpleMsg, _ := volumeToMount.GenerateMsg("MountVolume failed", mountError.Error())
og.recorder.Eventf(pv, v1.EventTypeWarning, kevents.FailedMountOnFilesystemMismatch, simpleMsg)
}
}
func (og *operationGenerator) markDeviceErrorState(volumeToMount VolumeToMount, devicePath, deviceMountPath string, mountError error, actualStateOfWorld ActualStateOfWorldMounterUpdater) {
if volumetypes.IsOperationFinishedError(mountError) &&
actualStateOfWorld.GetDeviceMountState(volumeToMount.VolumeName) == DeviceMountUncertain {
// Only devices which were uncertain can be marked as unmounted
markDeviceUnmountError := actualStateOfWorld.MarkDeviceAsUnmounted(volumeToMount.VolumeName)
if markDeviceUnmountError != nil {
klog.Errorf(volumeToMount.GenerateErrorDetailed("MountDevice.MarkDeviceAsUnmounted failed", markDeviceUnmountError).Error())
}
return
}
if volumetypes.IsUncertainProgressError(mountError) &&
actualStateOfWorld.GetDeviceMountState(volumeToMount.VolumeName) == DeviceNotMounted {
// only devices which are not mounted can be marked as uncertain. We do not want to mark a device
// which was previously marked as mounted here as uncertain.
markDeviceUncertainError := actualStateOfWorld.MarkDeviceAsUncertain(volumeToMount.VolumeName, devicePath, deviceMountPath)
if markDeviceUncertainError != nil {
klog.Errorf(volumeToMount.GenerateErrorDetailed("MountDevice.MarkDeviceAsUncertain failed", markDeviceUncertainError).Error())
}
}
}
func (og *operationGenerator) markVolumeErrorState(volumeToMount VolumeToMount, markOpts MarkVolumeOpts, actualStateOfWorld ActualStateOfWorldMounterUpdater) {
if actualStateOfWorld.GetVolumeMountState(volumeToMount.VolumeName, markOpts.PodName) == VolumeNotMounted {
t := actualStateOfWorld.MarkVolumeMountAsUncertain(markOpts)
if t != nil {
klog.Errorf(volumeToMount.GenerateErrorDetailed("MountVolume.MarkVolumeMountAsUncertain failed", t).Error())
}
}
}
func (og *operationGenerator) GenerateUnmountVolumeFunc(
volumeToUnmount MountedVolume,
actualStateOfWorld ActualStateOfWorldMounterUpdater,
podsDir string) (volumetypes.GeneratedOperations, error) {
// Get mountable plugin
volumePlugin, err := og.volumePluginMgr.FindPluginByName(volumeToUnmount.PluginName)
if err != nil || volumePlugin == nil {
return volumetypes.GeneratedOperations{}, volumeToUnmount.GenerateErrorDetailed("UnmountVolume.FindPluginByName failed", err)
}
volumeUnmounter, newUnmounterErr := volumePlugin.NewUnmounter(
volumeToUnmount.InnerVolumeSpecName, volumeToUnmount.PodUID)
if newUnmounterErr != nil {
return volumetypes.GeneratedOperations{}, volumeToUnmount.GenerateErrorDetailed("UnmountVolume.NewUnmounter failed", newUnmounterErr)
}
unmountVolumeFunc := func() volumetypes.OperationContext {
subpather := og.volumePluginMgr.Host.GetSubpather()
migrated := getMigratedStatusBySpec(volumeToUnmount.VolumeSpec)
// Remove all bind-mounts for subPaths
podDir := filepath.Join(podsDir, string(volumeToUnmount.PodUID))
if err := subpather.CleanSubPaths(podDir, volumeToUnmount.InnerVolumeSpecName); err != nil {
eventErr, detailedErr := volumeToUnmount.GenerateError("error cleaning subPath mounts", err)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
// Execute unmount
unmountErr := volumeUnmounter.TearDown()
if unmountErr != nil {
// Mark the volume as uncertain, so SetUp is called for new pods. Teardown may be already in progress.
opts := MarkVolumeOpts{
PodName: volumeToUnmount.PodName,
PodUID: volumeToUnmount.PodUID,
VolumeName: volumeToUnmount.VolumeName,
OuterVolumeSpecName: volumeToUnmount.OuterVolumeSpecName,
VolumeGidVolume: volumeToUnmount.VolumeGidValue,
VolumeSpec: volumeToUnmount.VolumeSpec,
VolumeMountState: VolumeMountUncertain,
}
markMountUncertainErr := actualStateOfWorld.MarkVolumeMountAsUncertain(opts)
if markMountUncertainErr != nil {
// There is nothing else we can do. Hope that UnmountVolume will be re-tried shortly.
klog.Errorf(volumeToUnmount.GenerateErrorDetailed("UnmountVolume.MarkVolumeMountAsUncertain failed", markMountUncertainErr).Error())
}
// On failure, return error. Caller will log and retry.
eventErr, detailedErr := volumeToUnmount.GenerateError("UnmountVolume.TearDown failed", unmountErr)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
klog.Infof(
"UnmountVolume.TearDown succeeded for volume %q (OuterVolumeSpecName: %q) pod %q (UID: %q). InnerVolumeSpecName %q. PluginName %q, VolumeGidValue %q",
volumeToUnmount.VolumeName,
volumeToUnmount.OuterVolumeSpecName,
volumeToUnmount.PodName,
volumeToUnmount.PodUID,
volumeToUnmount.InnerVolumeSpecName,
volumeToUnmount.PluginName,
volumeToUnmount.VolumeGidValue)
// Update actual state of world
markVolMountedErr := actualStateOfWorld.MarkVolumeAsUnmounted(
volumeToUnmount.PodName, volumeToUnmount.VolumeName)
if markVolMountedErr != nil {
// On failure, just log and exit
klog.Errorf(volumeToUnmount.GenerateErrorDetailed("UnmountVolume.MarkVolumeAsUnmounted failed", markVolMountedErr).Error())
}
return volumetypes.NewOperationContext(nil, nil, migrated)
}
return volumetypes.GeneratedOperations{
OperationName: "volume_unmount",
OperationFunc: unmountVolumeFunc,
CompleteFunc: util.OperationCompleteHook(util.GetFullQualifiedPluginNameForVolume(volumePlugin.GetPluginName(), volumeToUnmount.VolumeSpec), "volume_unmount"),
EventRecorderFunc: nil, // nil because we do not want to generate event on error
}, nil
}
func (og *operationGenerator) GenerateUnmountDeviceFunc(
deviceToDetach AttachedVolume,
actualStateOfWorld ActualStateOfWorldMounterUpdater,
hostutil hostutil.HostUtils) (volumetypes.GeneratedOperations, error) {
// Get DeviceMounter plugin
deviceMountableVolumePlugin, err :=
og.volumePluginMgr.FindDeviceMountablePluginByName(deviceToDetach.PluginName)
if err != nil || deviceMountableVolumePlugin == nil {
return volumetypes.GeneratedOperations{}, deviceToDetach.GenerateErrorDetailed("UnmountDevice.FindDeviceMountablePluginByName failed", err)
}
volumeDeviceUnmounter, err := deviceMountableVolumePlugin.NewDeviceUnmounter()
if err != nil {
return volumetypes.GeneratedOperations{}, deviceToDetach.GenerateErrorDetailed("UnmountDevice.NewDeviceUnmounter failed", err)
}
volumeDeviceMounter, err := deviceMountableVolumePlugin.NewDeviceMounter()
if err != nil {
return volumetypes.GeneratedOperations{}, deviceToDetach.GenerateErrorDetailed("UnmountDevice.NewDeviceMounter failed", err)
}
unmountDeviceFunc := func() volumetypes.OperationContext {
migrated := getMigratedStatusBySpec(deviceToDetach.VolumeSpec)
//deviceMountPath := deviceToDetach.DeviceMountPath
deviceMountPath, err :=
volumeDeviceMounter.GetDeviceMountPath(deviceToDetach.VolumeSpec)
if err != nil {
// On failure other than "does not exist", return error. Caller will log and retry.
if !strings.Contains(err.Error(), "does not exist") {
eventErr, detailedErr := deviceToDetach.GenerateError("GetDeviceMountPath failed", err)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
// If the mount path could not be found, don't fail the unmount, but instead log a warning and proceed,
// using the value from deviceToDetach.DeviceMountPath, so that the device can be marked as unmounted
deviceMountPath = deviceToDetach.DeviceMountPath
klog.Warningf(deviceToDetach.GenerateMsgDetailed(fmt.Sprintf(
"GetDeviceMountPath failed, but unmount operation will proceed using deviceMountPath=%s: %v", deviceMountPath, err), ""))
}
refs, err := deviceMountableVolumePlugin.GetDeviceMountRefs(deviceMountPath)
if err != nil || util.HasMountRefs(deviceMountPath, refs) {
if err == nil {
err = fmt.Errorf("the device mount path %q is still mounted by other references %v", deviceMountPath, refs)
}
eventErr, detailedErr := deviceToDetach.GenerateError("GetDeviceMountRefs check failed", err)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
// Execute unmount
unmountDeviceErr := volumeDeviceUnmounter.UnmountDevice(deviceMountPath)
if unmountDeviceErr != nil {
// Mark the device as uncertain, so MountDevice is called for new pods. UnmountDevice may be already in progress.
markDeviceUncertainErr := actualStateOfWorld.MarkDeviceAsUncertain(deviceToDetach.VolumeName, deviceToDetach.DevicePath, deviceMountPath)
if markDeviceUncertainErr != nil {
// There is nothing else we can do. Hope that UnmountDevice will be re-tried shortly.
klog.Errorf(deviceToDetach.GenerateErrorDetailed("UnmountDevice.MarkDeviceAsUncertain failed", markDeviceUncertainErr).Error())
}
// On failure, return error. Caller will log and retry.
eventErr, detailedErr := deviceToDetach.GenerateError("UnmountDevice failed", unmountDeviceErr)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
// Before logging that UnmountDevice succeeded and moving on,
// use hostutil.PathIsDevice to check if the path is a device,
// if so use hostutil.DeviceOpened to check if the device is in use anywhere
// else on the system. Retry if it returns true.
deviceOpened, deviceOpenedErr := isDeviceOpened(deviceToDetach, hostutil)
if deviceOpenedErr != nil {
return volumetypes.NewOperationContext(nil, deviceOpenedErr, migrated)
}
// The device is still in use elsewhere. Caller will log and retry.
if deviceOpened {
// Mark the device as uncertain, so MountDevice is called for new pods.
markDeviceUncertainErr := actualStateOfWorld.MarkDeviceAsUncertain(deviceToDetach.VolumeName, deviceToDetach.DevicePath, deviceMountPath)
if markDeviceUncertainErr != nil {
// There is nothing else we can do. Hope that UnmountDevice will be re-tried shortly.
klog.Errorf(deviceToDetach.GenerateErrorDetailed("UnmountDevice.MarkDeviceAsUncertain failed", markDeviceUncertainErr).Error())
}
eventErr, detailedErr := deviceToDetach.GenerateError(
"UnmountDevice failed",
goerrors.New("the device is in use when it was no longer expected to be in use"))
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
klog.Info(deviceToDetach.GenerateMsgDetailed("UnmountDevice succeeded", ""))
// Update actual state of world
markDeviceUnmountedErr := actualStateOfWorld.MarkDeviceAsUnmounted(
deviceToDetach.VolumeName)
if markDeviceUnmountedErr != nil {
// On failure, return error. Caller will log and retry.
eventErr, detailedErr := deviceToDetach.GenerateError("MarkDeviceAsUnmounted failed", markDeviceUnmountedErr)
return volumetypes.NewOperationContext(eventErr, detailedErr, migrated)
}
return volumetypes.NewOperationContext(nil, nil, migrated)
}
return volumetypes.GeneratedOperations{
OperationName: "unmount_device",
OperationFunc: unmountDeviceFunc,
CompleteFunc: util.OperationCompleteHook(util.GetFullQualifiedPluginNameForVolume(deviceMountableVolumePlugin.GetPluginName(), deviceToDetach.VolumeSpec), "unmount_device"),
EventRecorderFunc: nil, // nil because we do not want to generate event on error
}, nil
}
// GenerateMapVolumeFunc marks volume as mounted based on following steps.
// If plugin is attachable, call WaitForAttach() and then mark the device
// as mounted. On next step, SetUpDevice is called without dependent of
// plugin type, but this method mainly is targeted for none attachable plugin.
// After setup is done, create symbolic links on both global map path and pod
// device map path. Once symbolic links are created, take fd lock by
// loopback for the device to avoid silent volume replacement. This lock
// will be released once no one uses the device.
// If all steps are completed, the volume is marked as mounted.
func (og *operationGenerator) GenerateMapVolumeFunc(
waitForAttachTimeout time.Duration,
volumeToMount VolumeToMount,
actualStateOfWorld ActualStateOfWorldMounterUpdater) (volumetypes.GeneratedOperations, error) {
// Get block volume mapper plugin
blockVolumePlugin, err :=
og.volumePluginMgr.FindMapperPluginBySpec(volumeToMount.VolumeSpec)
if err != nil {
return volumetypes.GeneratedOperations{}, volumeToMount.GenerateErrorDetailed("MapVolume.FindMapperPluginBySpec failed", err)
}