forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 3
/
attacher.go
243 lines (204 loc) · 7.61 KB
/
attacher.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
/*
Copyright 2016 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 vsphere_volume
import (
"fmt"
"os"
"path"
"time"
"github.com/golang/glog"
"k8s.io/kubernetes/pkg/cloudprovider/providers/vsphere"
"k8s.io/kubernetes/pkg/util/exec"
"k8s.io/kubernetes/pkg/util/keymutex"
"k8s.io/kubernetes/pkg/util/mount"
"k8s.io/kubernetes/pkg/volume"
volumeutil "k8s.io/kubernetes/pkg/volume/util"
)
type vsphereVMDKAttacher struct {
host volume.VolumeHost
vsphereVolumes vsphere.Volumes
}
var _ volume.Attacher = &vsphereVMDKAttacher{}
var _ volume.AttachableVolumePlugin = &vsphereVolumePlugin{}
// Singleton key mutex for keeping attach operations for the same host atomic
var attachdetachMutex = keymutex.NewKeyMutex()
func (plugin *vsphereVolumePlugin) NewAttacher() (volume.Attacher, error) {
vsphereCloud, err := getCloudProvider(plugin.host.GetCloudProvider())
if err != nil {
return nil, err
}
return &vsphereVMDKAttacher{
host: plugin.host,
vsphereVolumes: vsphereCloud,
}, nil
}
// Attaches the volume specified by the given spec to the given host.
// On success, returns the device path where the device was attached on the
// node.
// Callers are responsible for retryinging on failure.
// Callers are responsible for thread safety between concurrent attach and
// detach operations.
func (attacher *vsphereVMDKAttacher) Attach(spec *volume.Spec, hostName string) (string, error) {
volumeSource, _, err := getVolumeSource(spec)
if err != nil {
return "", err
}
glog.V(4).Infof("vSphere: Attach disk called for host %s", hostName)
// Keeps concurrent attach operations to same host atomic
attachdetachMutex.LockKey(hostName)
defer attachdetachMutex.UnlockKey(hostName)
// vsphereCloud.AttachDisk checks if disk is already attached to host and
// succeeds in that case, so no need to do that separately.
_, diskUUID, err := attacher.vsphereVolumes.AttachDisk(volumeSource.VolumePath, hostName)
if err != nil {
glog.Errorf("Error attaching volume %q: %+v", volumeSource.VolumePath, err)
return "", err
}
return path.Join(diskByIDPath, diskSCSIPrefix+diskUUID), nil
}
func (attacher *vsphereVMDKAttacher) WaitForAttach(spec *volume.Spec, devicePath string, timeout time.Duration) (string, error) {
volumeSource, _, err := getVolumeSource(spec)
if err != nil {
return "", err
}
if devicePath == "" {
return "", fmt.Errorf("WaitForAttach failed for VMDK %q: devicePath is empty.", volumeSource.VolumePath)
}
ticker := time.NewTicker(checkSleepDuration)
defer ticker.Stop()
timer := time.NewTimer(timeout)
defer timer.Stop()
for {
select {
case <-ticker.C:
glog.V(5).Infof("Checking VMDK %q is attached", volumeSource.VolumePath)
path, err := verifyDevicePath(devicePath)
if err != nil {
// Log error, if any, and continue checking periodically. See issue #11321
glog.Warningf("Error verifying VMDK (%q) is attached: %v", volumeSource.VolumePath, err)
} else if path != "" {
// A device path has successfully been created for the VMDK
glog.Infof("Successfully found attached VMDK %q.", volumeSource.VolumePath)
return path, nil
}
case <-timer.C:
return "", fmt.Errorf("Could not find attached VMDK %q. Timeout waiting for mount paths to be created.", volumeSource.VolumePath)
}
}
}
// GetDeviceMountPath returns a path where the device should
// point which should be bind mounted for individual volumes.
func (attacher *vsphereVMDKAttacher) GetDeviceMountPath(spec *volume.Spec) (string, error) {
volumeSource, _, err := getVolumeSource(spec)
if err != nil {
return "", err
}
return makeGlobalPDPath(attacher.host, volumeSource.VolumePath), nil
}
// GetMountDeviceRefs finds all other references to the device referenced
// by deviceMountPath; returns a list of paths.
func (plugin *vsphereVolumePlugin) GetDeviceMountRefs(deviceMountPath string) ([]string, error) {
mounter := plugin.host.GetMounter()
return mount.GetMountRefs(mounter, deviceMountPath)
}
// MountDevice mounts device to global mount point.
func (attacher *vsphereVMDKAttacher) MountDevice(spec *volume.Spec, devicePath string, deviceMountPath string) error {
mounter := attacher.host.GetMounter()
notMnt, err := mounter.IsLikelyNotMountPoint(deviceMountPath)
if err != nil {
if os.IsNotExist(err) {
if err := os.MkdirAll(deviceMountPath, 0750); err != nil {
glog.Errorf("Failed to create directory at %#v. err: %s", deviceMountPath, err)
return err
}
notMnt = true
} else {
return err
}
}
volumeSource, _, err := getVolumeSource(spec)
if err != nil {
return err
}
options := []string{}
if notMnt {
diskMounter := &mount.SafeFormatAndMount{Interface: mounter, Runner: exec.New()}
err = diskMounter.FormatAndMount(devicePath, deviceMountPath, volumeSource.FSType, options)
if err != nil {
os.Remove(deviceMountPath)
return err
}
glog.V(4).Infof("formatting spec %v devicePath %v deviceMountPath %v fs %v with options %+v", spec.Name(), devicePath, deviceMountPath, volumeSource.FSType, options)
}
return nil
}
type vsphereVMDKDetacher struct {
mounter mount.Interface
vsphereVolumes vsphere.Volumes
}
var _ volume.Detacher = &vsphereVMDKDetacher{}
func (plugin *vsphereVolumePlugin) NewDetacher() (volume.Detacher, error) {
vsphereCloud, err := getCloudProvider(plugin.host.GetCloudProvider())
if err != nil {
return nil, err
}
return &vsphereVMDKDetacher{
mounter: plugin.host.GetMounter(),
vsphereVolumes: vsphereCloud,
}, nil
}
// Detach the given device from the given host.
func (detacher *vsphereVMDKDetacher) Detach(deviceMountPath string, hostName string) error {
volPath := getVolPathfromDeviceMountPath(deviceMountPath)
attached, err := detacher.vsphereVolumes.DiskIsAttached(volPath, hostName)
if err != nil {
// Log error and continue with detach
glog.Errorf(
"Error checking if volume (%q) is already attached to current node (%q). Will continue and try detach anyway. err=%v",
volPath, hostName, err)
}
if err == nil && !attached {
// Volume is already detached from node.
glog.Infof("detach operation was successful. volume %q is already detached from node %q.", volPath, hostName)
return nil
}
attachdetachMutex.LockKey(hostName)
defer attachdetachMutex.UnlockKey(hostName)
if err := detacher.vsphereVolumes.DetachDisk(volPath, hostName); err != nil {
glog.Errorf("Error detaching volume %q: %v", volPath, err)
return err
}
return nil
}
func (detacher *vsphereVMDKDetacher) WaitForDetach(devicePath string, timeout time.Duration) error {
ticker := time.NewTicker(checkSleepDuration)
defer ticker.Stop()
timer := time.NewTimer(timeout)
defer timer.Stop()
for {
select {
case <-ticker.C:
glog.V(5).Infof("Checking device %q is detached.", devicePath)
if pathExists, err := volumeutil.PathExists(devicePath); err != nil {
return fmt.Errorf("Error checking if device path exists: %v", err)
} else if !pathExists {
return nil
}
case <-timer.C:
return fmt.Errorf("Timeout reached; Device %v is still attached", devicePath)
}
}
}
func (detacher *vsphereVMDKDetacher) UnmountDevice(deviceMountPath string) error {
return volumeutil.UnmountPath(deviceMountPath, detacher.mounter)
}