286 lines
8.6 KiB
Go
286 lines
8.6 KiB
Go
/*
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Copyright 2016 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 cinder
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import (
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"fmt"
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"os"
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"path"
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"strings"
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"time"
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"github.com/golang/glog"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/kubernetes/pkg/util/exec"
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"k8s.io/kubernetes/pkg/util/mount"
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"k8s.io/kubernetes/pkg/volume"
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volumeutil "k8s.io/kubernetes/pkg/volume/util"
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)
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type cinderDiskAttacher struct {
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host volume.VolumeHost
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cinderProvider CinderProvider
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}
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var _ volume.Attacher = &cinderDiskAttacher{}
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var _ volume.AttachableVolumePlugin = &cinderPlugin{}
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const (
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checkSleepDuration = time.Second
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)
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func (plugin *cinderPlugin) NewAttacher() (volume.Attacher, error) {
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cinder, err := getCloudProvider(plugin.host.GetCloudProvider())
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if err != nil {
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return nil, err
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}
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return &cinderDiskAttacher{
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host: plugin.host,
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cinderProvider: cinder,
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}, nil
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}
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func (plugin *cinderPlugin) GetDeviceMountRefs(deviceMountPath string) ([]string, error) {
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mounter := plugin.host.GetMounter()
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return mount.GetMountRefs(mounter, deviceMountPath)
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}
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func (attacher *cinderDiskAttacher) Attach(spec *volume.Spec, nodeName types.NodeName) (string, error) {
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volumeSource, _, err := getVolumeSource(spec)
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if err != nil {
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return "", err
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}
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volumeID := volumeSource.VolumeID
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instances, res := attacher.cinderProvider.Instances()
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if !res {
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return "", fmt.Errorf("failed to list openstack instances")
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}
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instanceid, err := instances.InstanceID(nodeName)
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if err != nil {
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return "", err
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}
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if ind := strings.LastIndex(instanceid, "/"); ind >= 0 {
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instanceid = instanceid[(ind + 1):]
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}
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attached, err := attacher.cinderProvider.DiskIsAttached(volumeID, instanceid)
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if err != nil {
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// Log error and continue with attach
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glog.Warningf(
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"Error checking if volume (%q) is already attached to current instance (%q). Will continue and try attach anyway. err=%v",
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volumeID, instanceid, err)
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}
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if err == nil && attached {
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// Volume is already attached to instance.
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glog.Infof("Attach operation is successful. volume %q is already attached to instance %q.", volumeID, instanceid)
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} else {
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_, err = attacher.cinderProvider.AttachDisk(instanceid, volumeID)
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if err == nil {
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glog.Infof("Attach operation successful: volume %q attached to instance %q.", volumeID, instanceid)
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} else {
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glog.Infof("Attach volume %q to instance %q failed with %v", volumeID, instanceid, err)
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return "", err
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}
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}
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devicePath, err := attacher.cinderProvider.GetAttachmentDiskPath(instanceid, volumeID)
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if err != nil {
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glog.Infof("Attach volume %q to instance %q failed with %v", volumeID, instanceid, err)
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return "", err
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}
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return devicePath, err
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}
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func (attacher *cinderDiskAttacher) VolumesAreAttached(specs []*volume.Spec, nodeName types.NodeName) (map[*volume.Spec]bool, error) {
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volumesAttachedCheck := make(map[*volume.Spec]bool)
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volumeSpecMap := make(map[string]*volume.Spec)
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volumeIDList := []string{}
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for _, spec := range specs {
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volumeSource, _, err := getVolumeSource(spec)
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if err != nil {
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glog.Errorf("Error getting volume (%q) source : %v", spec.Name(), err)
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continue
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}
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volumeIDList = append(volumeIDList, volumeSource.VolumeID)
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volumesAttachedCheck[spec] = true
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volumeSpecMap[volumeSource.VolumeID] = spec
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}
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attachedResult, err := attacher.cinderProvider.DisksAreAttached(volumeIDList, string(nodeName))
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if err != nil {
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// Log error and continue with attach
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glog.Errorf(
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"Error checking if Volumes (%v) are already attached to current node (%q). Will continue and try attach anyway. err=%v",
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volumeIDList, nodeName, err)
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return volumesAttachedCheck, err
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}
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for volumeID, attached := range attachedResult {
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if !attached {
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spec := volumeSpecMap[volumeID]
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volumesAttachedCheck[spec] = false
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glog.V(2).Infof("VolumesAreAttached: check volume %q (specName: %q) is no longer attached", volumeID, spec.Name())
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}
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}
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return volumesAttachedCheck, nil
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}
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func (attacher *cinderDiskAttacher) WaitForAttach(spec *volume.Spec, devicePath string, timeout time.Duration) (string, error) {
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// NOTE: devicePath is is path as reported by Cinder, which may be incorrect and should not be used. See Issue #33128
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volumeSource, _, err := getVolumeSource(spec)
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if err != nil {
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return "", err
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}
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volumeID := volumeSource.VolumeID
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if devicePath == "" {
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return "", fmt.Errorf("WaitForAttach failed for Cinder disk %q: devicePath is empty.", volumeID)
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}
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ticker := time.NewTicker(checkSleepDuration)
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defer ticker.Stop()
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timer := time.NewTimer(timeout)
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defer timer.Stop()
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for {
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probeAttachedVolume()
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select {
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case <-ticker.C:
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glog.V(5).Infof("Checking Cinder disk %q is attached.", volumeID)
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probeAttachedVolume()
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if !attacher.cinderProvider.ShouldTrustDevicePath() {
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// Using the Cinder volume ID, find the real device path (See Issue #33128)
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devicePath = attacher.cinderProvider.GetDevicePath(volumeID)
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}
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exists, err := volumeutil.PathExists(devicePath)
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if exists && err == nil {
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glog.Infof("Successfully found attached Cinder disk %q at %v.", volumeID, devicePath)
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return devicePath, nil
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} else {
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// Log an error, and continue checking periodically
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glog.Errorf("Error: could not find attached Cinder disk %q (path: %q): %v", volumeID, devicePath, err)
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}
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case <-timer.C:
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return "", fmt.Errorf("Could not find attached Cinder disk %q. Timeout waiting for mount paths to be created.", volumeID)
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}
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}
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}
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func (attacher *cinderDiskAttacher) GetDeviceMountPath(
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spec *volume.Spec) (string, error) {
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volumeSource, _, err := getVolumeSource(spec)
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if err != nil {
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return "", err
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}
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return makeGlobalPDName(attacher.host, volumeSource.VolumeID), nil
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}
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// FIXME: this method can be further pruned.
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func (attacher *cinderDiskAttacher) MountDevice(spec *volume.Spec, devicePath string, deviceMountPath string) error {
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mounter := attacher.host.GetMounter()
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notMnt, err := mounter.IsLikelyNotMountPoint(deviceMountPath)
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if err != nil {
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if os.IsNotExist(err) {
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if err := os.MkdirAll(deviceMountPath, 0750); err != nil {
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return err
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}
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notMnt = true
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} else {
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return err
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}
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}
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volumeSource, readOnly, err := getVolumeSource(spec)
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if err != nil {
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return err
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}
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options := []string{}
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if readOnly {
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options = append(options, "ro")
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}
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if notMnt {
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diskMounter := &mount.SafeFormatAndMount{Interface: mounter, Runner: exec.New()}
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err = diskMounter.FormatAndMount(devicePath, deviceMountPath, volumeSource.FSType, options)
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if err != nil {
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os.Remove(deviceMountPath)
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return err
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}
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}
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return nil
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}
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type cinderDiskDetacher struct {
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mounter mount.Interface
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cinderProvider CinderProvider
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}
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var _ volume.Detacher = &cinderDiskDetacher{}
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func (plugin *cinderPlugin) NewDetacher() (volume.Detacher, error) {
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cinder, err := getCloudProvider(plugin.host.GetCloudProvider())
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if err != nil {
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return nil, err
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}
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return &cinderDiskDetacher{
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mounter: plugin.host.GetMounter(),
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cinderProvider: cinder,
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}, nil
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}
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func (detacher *cinderDiskDetacher) Detach(deviceMountPath string, nodeName types.NodeName) error {
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volumeID := path.Base(deviceMountPath)
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instances, res := detacher.cinderProvider.Instances()
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if !res {
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return fmt.Errorf("failed to list openstack instances")
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}
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instanceid, err := instances.InstanceID(nodeName)
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if ind := strings.LastIndex(instanceid, "/"); ind >= 0 {
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instanceid = instanceid[(ind + 1):]
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}
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attached, err := detacher.cinderProvider.DiskIsAttached(volumeID, instanceid)
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if err != nil {
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// Log error and continue with detach
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glog.Errorf(
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"Error checking if volume (%q) is already attached to current node (%q). Will continue and try detach anyway. err=%v",
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volumeID, nodeName, err)
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}
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if err == nil && !attached {
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// Volume is already detached from node.
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glog.Infof("detach operation was successful. volume %q is already detached from node %q.", volumeID, nodeName)
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return nil
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}
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if err = detacher.cinderProvider.DetachDisk(instanceid, volumeID); err != nil {
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glog.Errorf("Error detaching volume %q: %v", volumeID, err)
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return err
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}
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glog.Infof("detatached volume %q from instance %q", volumeID, instanceid)
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return nil
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}
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func (detacher *cinderDiskDetacher) UnmountDevice(deviceMountPath string) error {
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return volumeutil.UnmountPath(deviceMountPath, detacher.mounter)
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}
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