forked from kubernetes/kubernetes
-
Notifications
You must be signed in to change notification settings - Fork 0
/
csi_mounter.go
383 lines (333 loc) · 11.5 KB
/
csi_mounter.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
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
/*
Copyright 2017 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 csi
import (
"context"
"errors"
"fmt"
"os"
"path"
"github.com/golang/glog"
api "k8s.io/api/core/v1"
apierrs "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/types"
utilfeature "k8s.io/apiserver/pkg/util/feature"
"k8s.io/client-go/kubernetes"
"k8s.io/kubernetes/pkg/features"
kstrings "k8s.io/kubernetes/pkg/util/strings"
"k8s.io/kubernetes/pkg/volume"
"k8s.io/kubernetes/pkg/volume/util"
)
//TODO (vladimirvivien) move this in a central loc later
var (
volDataKey = struct {
specVolID,
volHandle,
driverName,
nodeName,
attachmentID string
}{
"specVolID",
"volumeHandle",
"driverName",
"nodeName",
"attachmentID",
}
currentPodInfoMountVersion = "v1"
)
type csiMountMgr struct {
csiClient csiClient
k8s kubernetes.Interface
plugin *csiPlugin
driverName string
volumeID string
specVolumeID string
readOnly bool
spec *volume.Spec
pod *api.Pod
podUID types.UID
options volume.VolumeOptions
volumeInfo map[string]string
volume.MetricsNil
}
// volume.Volume methods
var _ volume.Volume = &csiMountMgr{}
func (c *csiMountMgr) GetPath() string {
dir := path.Join(getTargetPath(c.podUID, c.specVolumeID, c.plugin.host), "/mount")
glog.V(4).Info(log("mounter.GetPath generated [%s]", dir))
return dir
}
func getTargetPath(uid types.UID, specVolumeID string, host volume.VolumeHost) string {
specVolID := kstrings.EscapeQualifiedNameForDisk(specVolumeID)
return host.GetPodVolumeDir(uid, kstrings.EscapeQualifiedNameForDisk(csiPluginName), specVolID)
}
// volume.Mounter methods
var _ volume.Mounter = &csiMountMgr{}
func (c *csiMountMgr) CanMount() error {
return nil
}
func (c *csiMountMgr) SetUp(fsGroup *int64) error {
return c.SetUpAt(c.GetPath(), fsGroup)
}
func (c *csiMountMgr) SetUpAt(dir string, fsGroup *int64) error {
glog.V(4).Infof(log("Mounter.SetUpAt(%s)", dir))
mounted, err := isDirMounted(c.plugin, dir)
if err != nil {
glog.Error(log("mounter.SetUpAt failed while checking mount status for dir [%s]", dir))
return err
}
if mounted {
glog.V(4).Info(log("mounter.SetUpAt skipping mount, dir already mounted [%s]", dir))
return nil
}
csiSource, err := getCSISourceFromSpec(c.spec)
if err != nil {
glog.Error(log("mounter.SetupAt failed to get CSI persistent source: %v", err))
return err
}
csi := c.csiClient
ctx, cancel := context.WithTimeout(context.Background(), csiTimeout)
defer cancel()
// Check for STAGE_UNSTAGE_VOLUME set and populate deviceMountPath if so
deviceMountPath := ""
stageUnstageSet, err := hasStageUnstageCapability(ctx, csi)
if err != nil {
glog.Error(log("mounter.SetUpAt failed to check for STAGE_UNSTAGE_VOLUME capabilty: %v", err))
return err
}
if stageUnstageSet {
deviceMountPath, err = makeDeviceMountPath(c.plugin, c.spec)
if err != nil {
glog.Error(log("mounter.SetUpAt failed to make device mount path: %v", err))
return err
}
}
// search for attachment by VolumeAttachment.Spec.Source.PersistentVolumeName
if c.volumeInfo == nil {
nodeName := string(c.plugin.host.GetNodeName())
c.volumeInfo, err = c.plugin.getPublishVolumeInfo(c.k8s, c.volumeID, c.driverName, nodeName)
if err != nil {
return err
}
}
attribs := csiSource.VolumeAttributes
nodePublishSecrets := map[string]string{}
if csiSource.NodePublishSecretRef != nil {
nodePublishSecrets, err = getCredentialsFromSecret(c.k8s, csiSource.NodePublishSecretRef)
if err != nil {
return fmt.Errorf("fetching NodePublishSecretRef %s/%s failed: %v",
csiSource.NodePublishSecretRef.Namespace, csiSource.NodePublishSecretRef.Name, err)
}
}
// create target_dir before call to NodePublish
if err := os.MkdirAll(dir, 0750); err != nil {
glog.Error(log("mouter.SetUpAt failed to create dir %#v: %v", dir, err))
return err
}
glog.V(4).Info(log("created target path successfully [%s]", dir))
//TODO (vladimirvivien) implement better AccessModes mapping between k8s and CSI
accessMode := api.ReadWriteOnce
if c.spec.PersistentVolume.Spec.AccessModes != nil {
accessMode = c.spec.PersistentVolume.Spec.AccessModes[0]
}
// Inject pod information into volume_attributes
podAttrs, err := c.podAttributes()
if err != nil {
glog.Error(log("mouter.SetUpAt failed to assemble volume attributes: %v", err))
return err
}
if podAttrs != nil {
if attribs == nil {
attribs = podAttrs
} else {
for k, v := range podAttrs {
attribs[k] = v
}
}
}
fsType := csiSource.FSType
err = csi.NodePublishVolume(
ctx,
c.volumeID,
c.readOnly,
deviceMountPath,
dir,
accessMode,
c.volumeInfo,
attribs,
nodePublishSecrets,
fsType,
)
if err != nil {
glog.Errorf(log("mounter.SetupAt failed: %v", err))
if removeMountDirErr := removeMountDir(c.plugin, dir); removeMountDirErr != nil {
glog.Error(log("mounter.SetupAt failed to remove mount dir after a NodePublish() error [%s]: %v", dir, removeMountDirErr))
}
return err
}
// apply volume ownership
if !c.readOnly && fsGroup != nil {
err := volume.SetVolumeOwnership(c, fsGroup)
if err != nil {
// attempt to rollback mount.
glog.Error(log("mounter.SetupAt failed to set fsgroup volume ownership for [%s]: %v", c.volumeID, err))
glog.V(4).Info(log("mounter.SetupAt attempting to unpublish volume %s due to previous error", c.volumeID))
if unpubErr := csi.NodeUnpublishVolume(ctx, c.volumeID, dir); unpubErr != nil {
glog.Error(log(
"mounter.SetupAt failed to unpublish volume [%s]: %v (caused by previous NodePublish error: %v)",
c.volumeID, unpubErr, err,
))
return fmt.Errorf("%v (caused by %v)", unpubErr, err)
}
if unmountErr := removeMountDir(c.plugin, dir); unmountErr != nil {
glog.Error(log(
"mounter.SetupAt failed to clean mount dir [%s]: %v (caused by previous NodePublish error: %v)",
dir, unmountErr, err,
))
return fmt.Errorf("%v (caused by %v)", unmountErr, err)
}
return err
}
glog.V(4).Info(log("mounter.SetupAt sets fsGroup to [%d] for %s", *fsGroup, c.volumeID))
}
glog.V(4).Infof(log("mounter.SetUp successfully requested NodePublish [%s]", dir))
return nil
}
func (c *csiMountMgr) podAttributes() (map[string]string, error) {
if !utilfeature.DefaultFeatureGate.Enabled(features.CSIDriverRegistry) {
return nil, nil
}
if c.plugin.csiDriverLister == nil {
return nil, errors.New("CSIDriver lister does not exist")
}
csiDriver, err := c.plugin.csiDriverLister.Get(c.driverName)
if err != nil {
if apierrs.IsNotFound(err) {
glog.V(4).Infof(log("CSIDriver %q not found, not adding pod information", c.driverName))
return nil, nil
}
return nil, err
}
// if PodInfoOnMountVersion is not set or not v1 we do not set pod attributes
if csiDriver.Spec.PodInfoOnMountVersion == nil || *csiDriver.Spec.PodInfoOnMountVersion != currentPodInfoMountVersion {
glog.V(4).Infof(log("CSIDriver %q does not require pod information", c.driverName))
return nil, nil
}
attrs := map[string]string{
"csi.storage.k8s.io/pod.name": c.pod.Name,
"csi.storage.k8s.io/pod.namespace": c.pod.Namespace,
"csi.storage.k8s.io/pod.uid": string(c.pod.UID),
"csi.storage.k8s.io/serviceAccount.name": c.pod.Spec.ServiceAccountName,
}
glog.V(4).Infof(log("CSIDriver %q requires pod information", c.driverName))
return attrs, nil
}
func (c *csiMountMgr) GetAttributes() volume.Attributes {
mounter := c.plugin.host.GetMounter(c.plugin.GetPluginName())
path := c.GetPath()
supportSelinux, err := mounter.GetSELinuxSupport(path)
if err != nil {
glog.V(2).Info(log("error checking for SELinux support: %s", err))
// Best guess
supportSelinux = false
}
return volume.Attributes{
ReadOnly: c.readOnly,
Managed: !c.readOnly,
SupportsSELinux: supportSelinux,
}
}
// volume.Unmounter methods
var _ volume.Unmounter = &csiMountMgr{}
func (c *csiMountMgr) TearDown() error {
return c.TearDownAt(c.GetPath())
}
func (c *csiMountMgr) TearDownAt(dir string) error {
glog.V(4).Infof(log("Unmounter.TearDown(%s)", dir))
// is dir even mounted ?
// TODO (vladimirvivien) this check may not work for an emptyDir or local storage
// see https://github.com/kubernetes/kubernetes/pull/56836#discussion_r155834524
mounted, err := isDirMounted(c.plugin, dir)
if err != nil {
glog.Error(log("unmounter.Teardown failed while checking mount status for dir [%s]: %v", dir, err))
return err
}
if !mounted {
glog.V(4).Info(log("unmounter.Teardown skipping unmount, dir not mounted [%s]", dir))
return nil
}
volID := c.volumeID
csi := c.csiClient
ctx, cancel := context.WithTimeout(context.Background(), csiTimeout)
defer cancel()
if err := csi.NodeUnpublishVolume(ctx, volID, dir); err != nil {
glog.Errorf(log("mounter.TearDownAt failed: %v", err))
return err
}
// clean mount point dir
if err := removeMountDir(c.plugin, dir); err != nil {
glog.Error(log("mounter.TearDownAt failed to clean mount dir [%s]: %v", dir, err))
return err
}
glog.V(4).Infof(log("mounte.TearDownAt successfully unmounted dir [%s]", dir))
return nil
}
// isDirMounted returns the !notMounted result from IsLikelyNotMountPoint check
func isDirMounted(plug *csiPlugin, dir string) (bool, error) {
mounter := plug.host.GetMounter(plug.GetPluginName())
notMnt, err := mounter.IsLikelyNotMountPoint(dir)
if err != nil && !os.IsNotExist(err) {
glog.Error(log("isDirMounted IsLikelyNotMountPoint test failed for dir [%v]", dir))
return false, err
}
return !notMnt, nil
}
// removeMountDir cleans the mount dir when dir is not mounted and removed the volume data file in dir
func removeMountDir(plug *csiPlugin, mountPath string) error {
glog.V(4).Info(log("removing mount path [%s]", mountPath))
if pathExists, pathErr := util.PathExists(mountPath); pathErr != nil {
glog.Error(log("failed while checking mount path stat [%s]", pathErr))
return pathErr
} else if !pathExists {
glog.Warning(log("skipping mount dir removal, path does not exist [%v]", mountPath))
return nil
}
mounter := plug.host.GetMounter(plug.GetPluginName())
notMnt, err := mounter.IsLikelyNotMountPoint(mountPath)
if err != nil {
glog.Error(log("mount dir removal failed [%s]: %v", mountPath, err))
return err
}
if notMnt {
glog.V(4).Info(log("dir not mounted, deleting it [%s]", mountPath))
if err := os.Remove(mountPath); err != nil && !os.IsNotExist(err) {
glog.Error(log("failed to remove dir [%s]: %v", mountPath, err))
return err
}
// remove volume data file as well
volPath := path.Dir(mountPath)
dataFile := path.Join(volPath, volDataFileName)
glog.V(4).Info(log("also deleting volume info data file [%s]", dataFile))
if err := os.Remove(dataFile); err != nil && !os.IsNotExist(err) {
glog.Error(log("failed to delete volume data file [%s]: %v", dataFile, err))
return err
}
// remove volume path
glog.V(4).Info(log("deleting volume path [%s]", volPath))
if err := os.Remove(volPath); err != nil && !os.IsNotExist(err) {
glog.Error(log("failed to delete volume path [%s]: %v", volPath, err))
return err
}
}
return nil
}