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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 (
"fmt"
"path"
"strings"
"time"
"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"
csilib "k8s.io/csi-translation-lib"
"k8s.io/klog"
expandcache "k8s.io/kubernetes/pkg/controller/volume/expand/cache"
"k8s.io/kubernetes/pkg/features"
kevents "k8s.io/kubernetes/pkg/kubelet/events"
"k8s.io/kubernetes/pkg/util/mount"
"k8s.io/kubernetes/pkg/volume"
"k8s.io/kubernetes/pkg/volume/csi"
"k8s.io/kubernetes/pkg/volume/util"
volumetypes "k8s.io/kubernetes/pkg/volume/util/types"
"k8s.io/kubernetes/pkg/volume/util/volumepathhandler"
)
const (
unknownVolumePlugin string = "UnknownVolumePlugin"
)
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
// checkNodeCapabilitiesBeforeMount, if set, enables the CanMount check,
// which verifies that the components (binaries, etc.) required to mount
// the volume are available on the underlying node before attempting mount.
checkNodeCapabilitiesBeforeMount bool
// blkUtil provides volume path related operations for block volume
blkUtil volumepathhandler.BlockVolumePathHandler
}
// NewOperationGenerator is returns instance of operationGenerator
func NewOperationGenerator(kubeClient clientset.Interface,
volumePluginMgr *volume.VolumePluginMgr,
recorder record.EventRecorder,
checkNodeCapabilitiesBeforeMount bool,
blkUtil volumepathhandler.BlockVolumePathHandler) OperationGenerator {
return &operationGenerator{
kubeClient: kubeClient,
volumePluginMgr: volumePluginMgr,
recorder: recorder,
checkNodeCapabilitiesBeforeMount: checkNodeCapabilitiesBeforeMount,
blkUtil: blkUtil,
}
}
// 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, error)
// 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 mount.Interface) (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 mount.Interface) (volumetypes.GeneratedOperations, error)
// GetVolumePluginMgr returns volume plugin manager
GetVolumePluginMgr() *volume.VolumePluginMgr
GenerateBulkVolumeVerifyFunc(
map[types.NodeName][]*volume.Spec,
string,
map[*volume.Spec]v1.UniqueVolumeName, ActualStateOfWorldAttacherUpdater) (volumetypes.GeneratedOperations, error)
GenerateExpandVolumeFunc(*expandcache.PVCWithResizeRequest, expandcache.VolumeResizeMap) (volumetypes.GeneratedOperations, error)
// Generates the volume file system resize function, which can resize volume's file system to expected size without unmounting the volume.
GenerateExpandVolumeFSWithoutUnmountingFunc(volumeToMount VolumeToMount, actualStateOfWorld ActualStateOfWorldMounterUpdater) (volumetypes.GeneratedOperations, error)
}
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
volumeSpecMap[volumeAttached.VolumeSpec] = volumeAttached.VolumeName
}
volumesAreAttachedFunc := func() (error, error) {
// 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)
}
}
}
return nil, nil
}
return volumetypes.GeneratedOperations{
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) {
bulkVolumeVerifyFunc := func() (error, error) {
attachableVolumePlugin, err :=
og.volumePluginMgr.FindAttachablePluginByName(pluginName)
if err != nil || attachableVolumePlugin == nil {
klog.Errorf(
"BulkVerifyVolume.FindAttachablePluginBySpec failed for plugin %q with: %v",
pluginName,
err)
return nil, nil
}
volumeAttacher, newAttacherErr := attachableVolumePlugin.NewAttacher()
if newAttacherErr != nil {
klog.Errorf(
"BulkVerifyVolume.NewAttacher failed for getting plugin %q with: %v",
attachableVolumePlugin,
newAttacherErr)
return nil, nil
}
bulkVolumeVerifier, ok := volumeAttacher.(volume.BulkVolumeVerifier)
if !ok {
klog.Errorf("BulkVerifyVolume failed to type assert attacher %q", bulkVolumeVerifier)
return nil, nil
}
attached, bulkAttachErr := bulkVolumeVerifier.BulkVerifyVolumes(pluginNodeVolumes)
if bulkAttachErr != nil {
klog.Errorf("BulkVerifyVolume.BulkVerifyVolumes Error checking volumes are attached with %v", bulkAttachErr)
return nil, nil
}
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)
}
}
}
return nil, nil
}
return volumetypes.GeneratedOperations{
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, error) {
var err error
var attachableVolumePlugin volume.AttachableVolumePlugin
// Get attacher plugin
eventRecorderFunc := func(err *error) {
if *err != nil {
for _, pod := range volumeToAttach.ScheduledPods {
og.recorder.Eventf(pod, v1.EventTypeWarning, kevents.FailedAttachVolume, (*err).Error())
}
}
}
originalSpec := volumeToAttach.VolumeSpec
// useCSIPlugin will check both CSIMigration and the plugin specific feature gate
if useCSIPlugin(og.volumePluginMgr, volumeToAttach.VolumeSpec) {
// The volume represented by this spec is CSI and thus should be migrated
attachableVolumePlugin, err = og.volumePluginMgr.FindAttachablePluginByName(csi.CSIPluginName)
if err != nil || attachableVolumePlugin == nil {
eventRecorderFunc(&err)
return volumetypes.GeneratedOperations{}, volumeToAttach.GenerateErrorDetailed("AttachVolume.FindAttachablePluginByName failed", err)
}
csiSpec, err := translateSpec(volumeToAttach.VolumeSpec)
if err != nil {
return volumetypes.GeneratedOperations{}, volumeToAttach.GenerateErrorDetailed("AttachVolume.TranslateSpec failed", err)
}
volumeToAttach.VolumeSpec = csiSpec
} else {
attachableVolumePlugin, err =
og.volumePluginMgr.FindAttachablePluginBySpec(volumeToAttach.VolumeSpec)
if err != nil || attachableVolumePlugin == nil {
eventRecorderFunc(&err)
return volumetypes.GeneratedOperations{}, volumeToAttach.GenerateErrorDetailed("AttachVolume.FindAttachablePluginBySpec failed", err)
}
}
volumeAttacher, newAttacherErr := attachableVolumePlugin.NewAttacher()
if newAttacherErr != nil {
eventRecorderFunc(&err)
return volumetypes.GeneratedOperations{}, volumeToAttach.GenerateErrorDetailed("AttachVolume.NewAttacher failed", newAttacherErr)
}
attachVolumeFunc := func() (error, error) {
// Execute attach
devicePath, attachErr := volumeAttacher.Attach(
volumeToAttach.VolumeSpec, volumeToAttach.NodeName)
if attachErr != nil {
if derr, ok := attachErr.(*volerr.DanglingAttachError); ok {
addErr := actualStateOfWorld.MarkVolumeAsAttached(
v1.UniqueVolumeName(""),
originalSpec,
derr.CurrentNode,
derr.DevicePath)
if addErr != nil {
klog.Errorf("AttachVolume.MarkVolumeAsAttached failed to fix dangling volume error for volume %q with %s", volumeToAttach.VolumeName, addErr)
}
} else {
addErr := actualStateOfWorld.MarkVolumeAsUncertain(
v1.UniqueVolumeName(""), originalSpec, volumeToAttach.NodeName)
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.
return volumeToAttach.GenerateError("AttachVolume.Attach failed", attachErr)
}
// 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(""), originalSpec, volumeToAttach.NodeName, devicePath)
if addVolumeNodeErr != nil {
// On failure, return error. Caller will log and retry.
return volumeToAttach.GenerateError("AttachVolume.MarkVolumeAsAttached failed", addVolumeNodeErr)
}
return nil, nil
}
return volumetypes.GeneratedOperations{
OperationFunc: attachVolumeFunc,
EventRecorderFunc: eventRecorderFunc,
CompleteFunc: util.OperationCompleteHook(util.GetFullQualifiedPluginNameForVolume(attachableVolumePlugin.GetPluginName(), volumeToAttach.VolumeSpec), "volume_attach"),
}, nil
}
func (og *operationGenerator) GetVolumePluginMgr() *volume.VolumePluginMgr {
return og.volumePluginMgr
}
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 {
// Get attacher plugin
// useCSIPlugin will check both CSIMigration and the plugin specific feature gate
if useCSIPlugin(og.volumePluginMgr, volumeToDetach.VolumeSpec) {
// The volume represented by this spec is CSI and thus should be migrated
attachableVolumePlugin, err = og.volumePluginMgr.FindAttachablePluginByName(csi.CSIPluginName)
if err != nil || attachableVolumePlugin == nil {
return volumetypes.GeneratedOperations{}, volumeToDetach.GenerateErrorDetailed("AttachVolume.FindAttachablePluginBySpec failed", err)
}
csiSpec, err := translateSpec(volumeToDetach.VolumeSpec)
if err != nil {
return volumetypes.GeneratedOperations{}, volumeToDetach.GenerateErrorDetailed("AttachVolume.TranslateSpec failed", err)
}
volumeToDetach.VolumeSpec = csiSpec
} else {
attachableVolumePlugin, err =
og.volumePluginMgr.FindAttachablePluginBySpec(volumeToDetach.VolumeSpec)
if err != nil || attachableVolumePlugin == nil {
return volumetypes.GeneratedOperations{}, volumeToDetach.GenerateErrorDetailed("DetachVolume.FindAttachablePluginBySpec 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)
}
// TODO(dyzz): This case can't distinguish between PV and In-line which is necessary because
// if it was PV it may have been migrated, but the same plugin with in-line may not have been.
// Suggestions welcome...
if csilib.IsMigratableByName(pluginName) && utilfeature.DefaultFeatureGate.Enabled(features.CSIMigration) {
// The volume represented by this spec is CSI and thus should be migrated
attachableVolumePlugin, err = og.volumePluginMgr.FindAttachablePluginByName(csi.CSIPluginName)
if err != nil || attachableVolumePlugin == nil {
return volumetypes.GeneratedOperations{}, volumeToDetach.GenerateErrorDetailed("AttachVolume.FindAttachablePluginBySpec failed", err)
}
// volumeToDetach.VolumeName here is always the in-tree volume name
// therefore a workaround is required. volumeToDetach.DevicePath
// is the attachID which happens to be what volumeName is needed for in Detach.
// Therefore we set volumeName to the attachID. And CSI Detach can detect and use that.
volumeName = volumeToDetach.DevicePath
} else {
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)
}
getVolumePluginMgrFunc := func() (error, error) {
var err error
if verifySafeToDetach {
err = og.verifyVolumeIsSafeToDetach(volumeToDetach)
}
if err == nil {
err = volumeDetacher.Detach(volumeName, volumeToDetach.NodeName)
}
if err != nil {
// On failure, add volume back to ReportAsAttached list
actualStateOfWorld.AddVolumeToReportAsAttached(
volumeToDetach.VolumeName, volumeToDetach.NodeName)
return volumeToDetach.GenerateError("DetachVolume.Detach failed", err)
}
klog.Infof(volumeToDetach.GenerateMsgDetailed("DetachVolume.Detach succeeded", ""))
// Update actual state of world
actualStateOfWorld.MarkVolumeAsDetached(
volumeToDetach.VolumeName, volumeToDetach.NodeName)
return nil, nil
}
return volumetypes.GeneratedOperations{
OperationFunc: getVolumePluginMgrFunc,
CompleteFunc: util.OperationCompleteHook(util.GetFullQualifiedPluginNameForVolume(pluginName, volumeToDetach.VolumeSpec), "volume_detach"),
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 {
// Get mounter plugin
volumePluginName := unknownVolumePlugin
volumePlugin, err :=
og.volumePluginMgr.FindPluginBySpec(volumeToMount.VolumeSpec)
if err == nil && volumePlugin != nil {
volumePluginName = volumePlugin.GetPluginName()
}
mountVolumeFunc := func() (error, error) {
if err != nil || volumePlugin == nil {
return volumeToMount.GenerateError("MountVolume.FindPluginBySpec failed", err)
}
affinityErr := checkNodeAffinity(og, volumeToMount, volumePlugin)
if affinityErr != nil {
return volumeToMount.GenerateError("MountVolume.NodeAffinity check failed", affinityErr)
}
volumeMounter, newMounterErr := volumePlugin.NewMounter(
volumeToMount.VolumeSpec,
volumeToMount.Pod,
volume.VolumeOptions{})
if newMounterErr != nil {
return volumeToMount.GenerateError("MountVolume.NewMounter initialization failed", newMounterErr)
}
mountCheckError := checkMountOptionSupport(og, volumeToMount, volumePlugin)
if mountCheckError != nil {
return volumeToMount.GenerateError("MountVolume.MountOptionSupport check failed", mountCheckError)
}
// 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
if volumeToMount.Pod.Spec.SecurityContext != nil &&
volumeToMount.Pod.Spec.SecurityContext.FSGroup != nil {
fsGroup = volumeToMount.Pod.Spec.SecurityContext.FSGroup
}
devicePath := volumeToMount.DevicePath
if volumeAttacher != nil {
// Wait for attachable volumes to finish attaching
klog.Infof(volumeToMount.GenerateMsgDetailed("MountVolume.WaitForAttach entering", fmt.Sprintf("DevicePath %q", volumeToMount.DevicePath)))
devicePath, err = volumeAttacher.WaitForAttach(
volumeToMount.VolumeSpec, devicePath, volumeToMount.Pod, waitForAttachTimeout)
if err != nil {
// On failure, return error. Caller will log and retry.
return volumeToMount.GenerateError("MountVolume.WaitForAttach failed", err)
}
klog.Infof(volumeToMount.GenerateMsgDetailed("MountVolume.WaitForAttach succeeded", fmt.Sprintf("DevicePath %q", devicePath)))
}
if volumeDeviceMounter != nil {
deviceMountPath, err :=
volumeDeviceMounter.GetDeviceMountPath(volumeToMount.VolumeSpec)
if err != nil {
// On failure, return error. Caller will log and retry.
return volumeToMount.GenerateError("MountVolume.GetDeviceMountPath failed", err)
}
// Mount device to global mount path
err = volumeDeviceMounter.MountDevice(
volumeToMount.VolumeSpec,
devicePath,
deviceMountPath)
if err != nil {
// On failure, return error. Caller will log and retry.
return volumeToMount.GenerateError("MountVolume.MountDevice failed", err)
}
klog.Infof(volumeToMount.GenerateMsgDetailed("MountVolume.MountDevice succeeded", fmt.Sprintf("device mount path %q", deviceMountPath)))
// 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.
return volumeToMount.GenerateError("MountVolume.MarkDeviceAsMounted failed", markDeviceMountedErr)
}
// resizeFileSystem will resize the file system if user has requested a resize of
// underlying persistent volume and is allowed to do so.
resizeSimpleError, resizeDetailedError := og.resizeFileSystem(volumeToMount, devicePath, deviceMountPath, volumePluginName)
if resizeSimpleError != nil || resizeDetailedError != nil {
return resizeSimpleError, resizeDetailedError
}
}
if og.checkNodeCapabilitiesBeforeMount {
if canMountErr := volumeMounter.CanMount(); canMountErr != nil {
err = fmt.Errorf(
"Verify that your node machine has the required components before attempting to mount this volume type. %s",
canMountErr)
return volumeToMount.GenerateError("MountVolume.CanMount failed", err)
}
}
// Execute mount
mountErr := volumeMounter.SetUp(fsGroup)
if mountErr != nil {
// On failure, return error. Caller will log and retry.
return volumeToMount.GenerateError("MountVolume.SetUp failed", mountErr)
}
_, detailedMsg := volumeToMount.GenerateMsg("MountVolume.SetUp succeeded", "")
verbosity := klog.Level(1)
if isRemount {
verbosity = klog.Level(4)
}
klog.V(verbosity).Infof(detailedMsg)
// Update actual state of world
markVolMountedErr := actualStateOfWorld.MarkVolumeAsMounted(
volumeToMount.PodName,
volumeToMount.Pod.UID,
volumeToMount.VolumeName,
volumeMounter,
nil,
volumeToMount.OuterVolumeSpecName,
volumeToMount.VolumeGidValue,
volumeToMount.VolumeSpec)
if markVolMountedErr != nil {
// On failure, return error. Caller will log and retry.
return volumeToMount.GenerateError("MountVolume.MarkVolumeAsMounted failed", markVolMountedErr)
}
return nil, nil
}
eventRecorderFunc := func(err *error) {
if *err != nil {
og.recorder.Eventf(volumeToMount.Pod, v1.EventTypeWarning, kevents.FailedMountVolume, (*err).Error())
}
}
return volumetypes.GeneratedOperations{
OperationFunc: mountVolumeFunc,
EventRecorderFunc: eventRecorderFunc,
CompleteFunc: util.OperationCompleteHook(util.GetFullQualifiedPluginNameForVolume(volumePluginName, volumeToMount.VolumeSpec), "volume_mount"),
}
}
func (og *operationGenerator) resizeFileSystem(volumeToMount VolumeToMount, devicePath, deviceMountPath, pluginName string) (simpleErr, detailedErr error) {
if !utilfeature.DefaultFeatureGate.Enabled(features.ExpandPersistentVolumes) {
klog.V(4).Infof("Resizing is not enabled for this volume %s", volumeToMount.VolumeName)
return nil, nil
}
// Get expander, if possible
expandableVolumePlugin, _ :=
og.volumePluginMgr.FindFSResizablePluginBySpec(volumeToMount.VolumeSpec)
if expandableVolumePlugin != nil &&
expandableVolumePlugin.RequiresFSResize() &&
volumeToMount.VolumeSpec.PersistentVolume != nil {
pv := volumeToMount.VolumeSpec.PersistentVolume
pvc, err := og.kubeClient.CoreV1().PersistentVolumeClaims(pv.Spec.ClaimRef.Namespace).Get(pv.Spec.ClaimRef.Name, metav1.GetOptions{})
if err != nil {
// Return error rather than leave the file system un-resized, caller will log and retry
return volumeToMount.GenerateError("MountVolume.resizeFileSystem get PVC failed", err)
}
pvcStatusCap := pvc.Status.Capacity[v1.ResourceStorage]
pvSpecCap := pv.Spec.Capacity[v1.ResourceStorage]
if pvcStatusCap.Cmp(pvSpecCap) < 0 {
// File system resize was requested, proceed
klog.V(4).Infof(volumeToMount.GenerateMsgDetailed("MountVolume.resizeFileSystem entering", fmt.Sprintf("DevicePath %q", volumeToMount.DevicePath)))
if volumeToMount.VolumeSpec.ReadOnly {
simpleMsg, detailedMsg := volumeToMount.GenerateMsg("MountVolume.resizeFileSystem failed", "requested read-only file system")
klog.Warningf(detailedMsg)
og.recorder.Eventf(volumeToMount.Pod, v1.EventTypeWarning, kevents.FileSystemResizeFailed, simpleMsg)
return nil, nil
}
if resizeErr := expandableVolumePlugin.ExpandFS(volumeToMount.VolumeSpec, devicePath, deviceMountPath, pvSpecCap, pvcStatusCap); resizeErr != nil {
return volumeToMount.GenerateError("MountVolume.resizeFileSystem failed", resizeErr)
}
simpleMsg, detailedMsg := volumeToMount.GenerateMsg("MountVolume.resizeFileSystem succeeded", "")
og.recorder.Eventf(volumeToMount.Pod, v1.EventTypeNormal, kevents.FileSystemResizeSuccess, simpleMsg)
klog.Infof(detailedMsg)
// File system resize succeeded, now update the PVC's Capacity to match the PV's
err = util.MarkFSResizeFinished(pvc, pv.Spec.Capacity, og.kubeClient)
if err != nil {
// On retry, resizeFileSystem will be called again but do nothing
return volumeToMount.GenerateError("MountVolume.resizeFileSystem update PVC status failed", err)
}
return nil, nil
}
}
return nil, nil
}
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() (error, error) {
mounter := og.volumePluginMgr.Host.GetMounter(volumeToUnmount.PluginName)
// Remove all bind-mounts for subPaths
podDir := path.Join(podsDir, string(volumeToUnmount.PodUID))
if err := mounter.CleanSubPaths(podDir, volumeToUnmount.InnerVolumeSpecName); err != nil {
return volumeToUnmount.GenerateError("error cleaning subPath mounts", err)
}
// Execute unmount
unmountErr := volumeUnmounter.TearDown()
if unmountErr != nil {
// On failure, return error. Caller will log and retry.
return volumeToUnmount.GenerateError("UnmountVolume.TearDown failed", unmountErr)
}
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 nil, nil
}
return volumetypes.GeneratedOperations{
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,
mounter mount.Interface) (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)
}
volumeDeviceUmounter, err := deviceMountableVolumePlugin.NewDeviceUnmounter()
if err != nil {
return volumetypes.GeneratedOperations{}, deviceToDetach.GenerateErrorDetailed("UnmountDevice.NewDeviceUmounter failed", err)
}
volumeDeviceMounter, err := deviceMountableVolumePlugin.NewDeviceMounter()
if err != nil {
return volumetypes.GeneratedOperations{}, deviceToDetach.GenerateErrorDetailed("UnmountDevice.NewDeviceMounter failed", err)
}
unmountDeviceFunc := func() (error, error) {
//deviceMountPath := deviceToDetach.DeviceMountPath
deviceMountPath, err :=
volumeDeviceMounter.GetDeviceMountPath(deviceToDetach.VolumeSpec)
if err != nil {
// On failure, return error. Caller will log and retry.
return deviceToDetach.GenerateError("GetDeviceMountPath failed", err)
}
refs, err := deviceMountableVolumePlugin.GetDeviceMountRefs(deviceMountPath)
if err != nil || mount.HasMountRefs(deviceMountPath, refs) {
if err == nil {
err = fmt.Errorf("The device mount path %q is still mounted by other references %v", deviceMountPath, refs)
}
return deviceToDetach.GenerateError("GetDeviceMountRefs check failed", err)
}
// Execute unmount
unmountDeviceErr := volumeDeviceUmounter.UnmountDevice(deviceMountPath)
if unmountDeviceErr != nil {
// On failure, return error. Caller will log and retry.
return deviceToDetach.GenerateError("UnmountDevice failed", unmountDeviceErr)
}
// Before logging that UnmountDevice succeeded and moving on,
// use mounter.PathIsDevice to check if the path is a device,
// if so use mounter.DeviceOpened to check if the device is in use anywhere
// else on the system. Retry if it returns true.
deviceOpened, deviceOpenedErr := isDeviceOpened(deviceToDetach, mounter)
if deviceOpenedErr != nil {
return nil, deviceOpenedErr
}
// The device is still in use elsewhere. Caller will log and retry.
if deviceOpened {
return deviceToDetach.GenerateError(
"UnmountDevice failed",
fmt.Errorf("the device is in use when it was no longer expected to be in use"))
}
klog.Infof(deviceToDetach.GenerateMsg("UnmountDevice succeeded", ""))
// Update actual state of world
markDeviceUnmountedErr := actualStateOfWorld.MarkDeviceAsUnmounted(
deviceToDetach.VolumeName)
if markDeviceUnmountedErr != nil {
// On failure, return error. Caller will log and retry.
return deviceToDetach.GenerateError("MarkDeviceAsUnmounted failed", markDeviceUnmountedErr)
}
return nil, nil
}
return volumetypes.GeneratedOperations{
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
var blockVolumeMapper volume.BlockVolumeMapper
blockVolumePlugin, err :=
og.volumePluginMgr.FindMapperPluginBySpec(volumeToMount.VolumeSpec)
if err != nil {
return volumetypes.GeneratedOperations{}, volumeToMount.GenerateErrorDetailed("MapVolume.FindMapperPluginBySpec failed", err)
}
if blockVolumePlugin == nil {
return volumetypes.GeneratedOperations{}, volumeToMount.GenerateErrorDetailed("MapVolume.FindMapperPluginBySpec failed to find BlockVolumeMapper plugin. Volume plugin is nil.", nil)
}
affinityErr := checkNodeAffinity(og, volumeToMount, blockVolumePlugin)
if affinityErr != nil {
eventErr, detailedErr := volumeToMount.GenerateError("MapVolume.NodeAffinity check failed", affinityErr)
og.recorder.Eventf(volumeToMount.Pod, v1.EventTypeWarning, kevents.FailedMountVolume, eventErr.Error())
return volumetypes.GeneratedOperations{}, detailedErr
}
blockVolumeMapper, newMapperErr := blockVolumePlugin.NewBlockVolumeMapper(
volumeToMount.VolumeSpec,
volumeToMount.Pod,
volume.VolumeOptions{})
if newMapperErr != nil {
eventErr, detailedErr := volumeToMount.GenerateError("MapVolume.NewBlockVolumeMapper initialization failed", newMapperErr)
og.recorder.Eventf(volumeToMount.Pod, v1.EventTypeWarning, kevents.FailedMapVolume, eventErr.Error())
return volumetypes.GeneratedOperations{}, detailedErr
}
// Get attacher, if possible
attachableVolumePlugin, _ :=
og.volumePluginMgr.FindAttachablePluginBySpec(volumeToMount.VolumeSpec)
var volumeAttacher volume.Attacher
if attachableVolumePlugin != nil {
volumeAttacher, _ = attachableVolumePlugin.NewAttacher()
}
mapVolumeFunc := func() (error, error) {
var devicePath string
// Set up global map path under the given plugin directory using symbolic link
globalMapPath, err :=
blockVolumeMapper.GetGlobalMapPath(volumeToMount.VolumeSpec)
if err != nil {
// On failure, return error. Caller will log and retry.
return volumeToMount.GenerateError("MapVolume.GetDeviceMountPath failed", err)
}
if volumeAttacher != nil {
// Wait for attachable volumes to finish attaching
klog.Infof(volumeToMount.GenerateMsgDetailed("MapVolume.WaitForAttach entering", fmt.Sprintf("DevicePath %q", volumeToMount.DevicePath)))
devicePath, err = volumeAttacher.WaitForAttach(
volumeToMount.VolumeSpec, volumeToMount.DevicePath, volumeToMount.Pod, waitForAttachTimeout)
if err != nil {
// On failure, return error. Caller will log and retry.
return volumeToMount.GenerateError("MapVolume.WaitForAttach failed", err)
}
klog.Infof(volumeToMount.GenerateMsgDetailed("MapVolume.WaitForAttach succeeded", fmt.Sprintf("DevicePath %q", devicePath)))
}
// A plugin doesn't have attacher also needs to map device to global map path with SetUpDevice()
pluginDevicePath, mapErr := blockVolumeMapper.SetUpDevice()
if mapErr != nil {
// On failure, return error. Caller will log and retry.
return volumeToMount.GenerateError("MapVolume.SetUp failed", mapErr)
}
// if pluginDevicePath is provided, assume attacher may not provide device
// or attachment flow uses SetupDevice to get device path
if len(pluginDevicePath) != 0 {
devicePath = pluginDevicePath
}
if len(devicePath) == 0 {
return volumeToMount.GenerateError("MapVolume failed", fmt.Errorf("Device path of the volume is empty"))
}
// When kubelet is containerized, devicePath may be a symlink at a place unavailable to
// kubelet, so evaluate it on the host and expect that it links to a device in /dev,
// which will be available to containerized kubelet. If still it does not exist,
// AttachFileDevice will fail. If kubelet is not containerized, eval it anyway.
mounter := og.GetVolumePluginMgr().Host.GetMounter(blockVolumePlugin.GetPluginName())
devicePath, err = mounter.EvalHostSymlinks(devicePath)
if err != nil {
return volumeToMount.GenerateError("MapVolume.EvalHostSymlinks failed", err)
}
// Map device to global and pod device map path
volumeMapPath, volName := blockVolumeMapper.GetPodDeviceMapPath()
mapErr = blockVolumeMapper.MapDevice(devicePath, globalMapPath, volumeMapPath, volName, volumeToMount.Pod.UID)
if mapErr != nil {
// On failure, return error. Caller will log and retry.
return volumeToMount.GenerateError("MapVolume.MapDevice failed", mapErr)
}
// Take filedescriptor lock to keep a block device opened. Otherwise, there is a case
// that the block device is silently removed and attached another device with same name.
// Container runtime can't handler this problem. To avoid unexpected condition fd lock
// for the block device is required.
_, err = og.blkUtil.AttachFileDevice(devicePath)
if err != nil {
return volumeToMount.GenerateError("MapVolume.AttachFileDevice failed", err)
}
// Update actual state of world to reflect volume is globally mounted
markDeviceMappedErr := actualStateOfWorld.MarkDeviceAsMounted(
volumeToMount.VolumeName, devicePath, globalMapPath)
if markDeviceMappedErr != nil {
// On failure, return error. Caller will log and retry.
return volumeToMount.GenerateError("MapVolume.MarkDeviceAsMounted failed", markDeviceMappedErr)
}
// Device mapping for global map path succeeded
simpleMsg, detailedMsg := volumeToMount.GenerateMsg("MapVolume.MapDevice succeeded", fmt.Sprintf("globalMapPath %q", globalMapPath))
verbosity := klog.Level(4)
og.recorder.Eventf(volumeToMount.Pod, v1.EventTypeNormal, kevents.SuccessfulMountVolume, simpleMsg)
klog.V(verbosity).Infof(detailedMsg)
// Device mapping for pod device map path succeeded
simpleMsg, detailedMsg = volumeToMount.GenerateMsg("MapVolume.MapDevice succeeded", fmt.Sprintf("volumeMapPath %q", volumeMapPath))
verbosity = klog.Level(1)
og.recorder.Eventf(volumeToMount.Pod, v1.EventTypeNormal, kevents.SuccessfulMountVolume, simpleMsg)
klog.V(verbosity).Infof(detailedMsg)
// Update actual state of world
markVolMountedErr := actualStateOfWorld.MarkVolumeAsMounted(
volumeToMount.PodName,
volumeToMount.Pod.UID,
volumeToMount.VolumeName,
nil,
blockVolumeMapper,
volumeToMount.OuterVolumeSpecName,
volumeToMount.VolumeGidValue,
volumeToMount.VolumeSpec)
if markVolMountedErr != nil {