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Merge pull request #63579 from jsafrane/fix-rbd-double-mount

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Automatic merge from submit-queue (batch tested with PRs 63830, 63579, 64173). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Fix iSCSI and RBD UnmountDevice with mount containers.

Google's [configure-helper.sh](https://github.com/kubernetes/kubernetes/blob/master/cluster/gce/gci/configure-helper.sh) script bind-mounts `/var/lib/kubelet` somewhere into `/home/kubernetes` and thus every mount that Kubernetes does is visible **twice** in `/proc/mounts`.

iSCSI and RBD volume plugins should not rely on counting entries in `/proc/mounts` and unmount device when Kubernetes thinks it's unusued. Kubernetes tracks the mounts by itself and most of other volume plugins already rely on it safely.

/sig storage

Fixes #56704
(well, it does not fix it, but it makes Kubernetes working with double mounts)

**Release note**:

```release-note
NONE
```

@rootfs, PTAL
This commit is contained in:
Kubernetes Submit Queue 2018-05-22 23:52:06 -07:00 committed by GitHub
commit f8decc04eb
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2 changed files with 8 additions and 21 deletions
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11
pkg/volume/iscsi/iscsi_util.go
View File

@ -396,25 +396,16 @@ func globalPDPathOperation(b iscsiDiskMounter) func(iscsiDiskMounter, string, *I
// DetachDisk unmounts and detaches a volume from node
func (util *ISCSIUtil) DetachDisk(c iscsiDiskUnmounter, mntPath string) error {
_, cnt, err := mount.GetDeviceNameFromMount(c.mounter, mntPath)
if err != nil {
glog.Errorf("iscsi detach disk: failed to get device from mnt: %s\nError: %v", mntPath, err)
return err
}
if pathExists, pathErr := volumeutil.PathExists(mntPath); pathErr != nil {
return fmt.Errorf("Error checking if path exists: %v", pathErr)
} else if !pathExists {
glog.Warningf("Warning: Unmount skipped because path does not exist: %v", mntPath)
return nil
}
if err = c.mounter.Unmount(mntPath); err != nil {
if err := c.mounter.Unmount(mntPath); err != nil {
glog.Errorf("iscsi detach disk: failed to unmount: %s\nError: %v", mntPath, err)
return err
}
cnt--
if cnt != 0 {
return nil
}
// if device is no longer used, see if need to logout the target
device, prefix, err := extractDeviceAndPrefix(mntPath)
if err != nil {

8
pkg/volume/rbd/attacher.go
View File

@ -189,21 +189,17 @@ func (detacher *rbdDetacher) UnmountDevice(deviceMountPath string) error {
glog.Warningf("Warning: Unmount skipped because path does not exist: %v", deviceMountPath)
return nil
}
devicePath, cnt, err := mount.GetDeviceNameFromMount(detacher.mounter, deviceMountPath)
devicePath, _, err := mount.GetDeviceNameFromMount(detacher.mounter, deviceMountPath)
if err != nil {
return err
}
if cnt > 1 {
return fmt.Errorf("rbd: more than 1 reference counts at %s", deviceMountPath)
}
if cnt == 1 {
// Unmount the device from the device mount point.
glog.V(4).Infof("rbd: unmouting device mountpoint %s", deviceMountPath)
if err = detacher.mounter.Unmount(deviceMountPath); err != nil {
return err
}
glog.V(3).Infof("rbd: successfully umount device mountpath %s", deviceMountPath)
}
glog.V(4).Infof("rbd: detaching device %s", devicePath)
err = detacher.manager.DetachDisk(detacher.plugin, deviceMountPath, devicePath)
if err != nil {