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fc.go
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fc.go
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/*
Copyright 2015 The Kubernetes Authors All rights reserved.
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 fc
import (
"fmt"
"strconv"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/types"
"k8s.io/kubernetes/pkg/util/exec"
"k8s.io/kubernetes/pkg/util/mount"
"k8s.io/kubernetes/pkg/util/strings"
"k8s.io/kubernetes/pkg/volume"
)
// This is the primary entrypoint for volume plugins.
func ProbeVolumePlugins() []volume.VolumePlugin {
return []volume.VolumePlugin{&fcPlugin{nil, exec.New()}}
}
type fcPlugin struct {
host volume.VolumeHost
exe exec.Interface
}
var _ volume.VolumePlugin = &fcPlugin{}
var _ volume.PersistentVolumePlugin = &fcPlugin{}
const (
fcPluginName = "kubernetes.io/fc"
)
func (plugin *fcPlugin) Init(host volume.VolumeHost) error {
plugin.host = host
return nil
}
func (plugin *fcPlugin) Name() string {
return fcPluginName
}
func (plugin *fcPlugin) CanSupport(spec *volume.Spec) bool {
if (spec.Volume != nil && spec.Volume.FC == nil) || (spec.PersistentVolume != nil && spec.PersistentVolume.Spec.FC == nil) {
return false
}
return true
}
func (plugin *fcPlugin) GetAccessModes() []api.PersistentVolumeAccessMode {
return []api.PersistentVolumeAccessMode{
api.ReadWriteOnce,
api.ReadOnlyMany,
}
}
func (plugin *fcPlugin) NewBuilder(spec *volume.Spec, pod *api.Pod, _ volume.VolumeOptions) (volume.Builder, error) {
// Inject real implementations here, test through the internal function.
return plugin.newBuilderInternal(spec, pod.UID, &FCUtil{}, plugin.host.GetMounter())
}
func (plugin *fcPlugin) newBuilderInternal(spec *volume.Spec, podUID types.UID, manager diskManager, mounter mount.Interface) (volume.Builder, error) {
// fc volumes used directly in a pod have a ReadOnly flag set by the pod author.
// fc volumes used as a PersistentVolume gets the ReadOnly flag indirectly through the persistent-claim volume used to mount the PV
var readOnly bool
var fc *api.FCVolumeSource
if spec.Volume != nil && spec.Volume.FC != nil {
fc = spec.Volume.FC
readOnly = fc.ReadOnly
} else {
fc = spec.PersistentVolume.Spec.FC
readOnly = spec.ReadOnly
}
if fc.Lun == nil {
return nil, fmt.Errorf("empty lun")
}
lun := strconv.Itoa(*fc.Lun)
return &fcDiskBuilder{
fcDisk: &fcDisk{
podUID: podUID,
volName: spec.Name(),
wwns: fc.TargetWWNs,
lun: lun,
manager: manager,
io: &osIOHandler{},
plugin: plugin},
fsType: fc.FSType,
readOnly: readOnly,
mounter: &mount.SafeFormatAndMount{mounter, exec.New()},
}, nil
}
func (plugin *fcPlugin) NewCleaner(volName string, podUID types.UID) (volume.Cleaner, error) {
// Inject real implementations here, test through the internal function.
return plugin.newCleanerInternal(volName, podUID, &FCUtil{}, plugin.host.GetMounter())
}
func (plugin *fcPlugin) newCleanerInternal(volName string, podUID types.UID, manager diskManager, mounter mount.Interface) (volume.Cleaner, error) {
return &fcDiskCleaner{
fcDisk: &fcDisk{
podUID: podUID,
volName: volName,
manager: manager,
plugin: plugin,
io: &osIOHandler{},
},
mounter: mounter,
}, nil
}
func (plugin *fcPlugin) execCommand(command string, args []string) ([]byte, error) {
cmd := plugin.exe.Command(command, args...)
return cmd.CombinedOutput()
}
type fcDisk struct {
volName string
podUID types.UID
portal string
wwns []string
lun string
plugin *fcPlugin
// Utility interface that provides API calls to the provider to attach/detach disks.
manager diskManager
// io handler interface
io ioHandler
volume.MetricsNil
}
func (fc *fcDisk) GetPath() string {
name := fcPluginName
// safe to use PodVolumeDir now: volume teardown occurs before pod is cleaned up
return fc.plugin.host.GetPodVolumeDir(fc.podUID, strings.EscapeQualifiedNameForDisk(name), fc.volName)
}
type fcDiskBuilder struct {
*fcDisk
readOnly bool
fsType string
mounter *mount.SafeFormatAndMount
}
var _ volume.Builder = &fcDiskBuilder{}
func (b *fcDiskBuilder) GetAttributes() volume.Attributes {
return volume.Attributes{
ReadOnly: b.readOnly,
Managed: !b.readOnly,
SupportsSELinux: true,
}
}
func (b *fcDiskBuilder) SetUp(fsGroup *int64) error {
return b.SetUpAt(b.GetPath(), fsGroup)
}
func (b *fcDiskBuilder) SetUpAt(dir string, fsGroup *int64) error {
// diskSetUp checks mountpoints and prevent repeated calls
err := diskSetUp(b.manager, *b, dir, b.mounter, fsGroup)
if err != nil {
glog.Errorf("fc: failed to setup")
}
return err
}
type fcDiskCleaner struct {
*fcDisk
mounter mount.Interface
}
var _ volume.Cleaner = &fcDiskCleaner{}
// Unmounts the bind mount, and detaches the disk only if the disk
// resource was the last reference to that disk on the kubelet.
func (c *fcDiskCleaner) TearDown() error {
return c.TearDownAt(c.GetPath())
}
func (c *fcDiskCleaner) TearDownAt(dir string) error {
return diskTearDown(c.manager, *c, dir, c.mounter)
}