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Fix descriptor lock release logic for block volume unmapDevice

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Fixes: #69114
This commit is contained in:
Masaki Kimura
2018-09-26 19:56:58 +00:00
parent c1ad6e961a
commit 3d808540df
4 changed files with 21 additions and 87 deletions
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22
pkg/volume/iscsi/iscsi_util.go
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@@ -34,7 +34,6 @@ import (
"k8s.io/kubernetes/pkg/util/mount"
"k8s.io/kubernetes/pkg/volume"
volumeutil "k8s.io/kubernetes/pkg/volume/util"
"k8s.io/kubernetes/pkg/volume/util/volumepathhandler"
)
var (
@@ -676,32 +675,11 @@ func (util *ISCSIUtil) DetachBlockISCSIDisk(c iscsiDiskUnmapper, mapPath string)
if mappedDevicePath := c.deviceUtil.FindMultipathDeviceForDevice(devicePath); mappedDevicePath != "" {
devicePath = mappedDevicePath
}
// Get loopback device which takes fd lock for devicePath before detaching a volume from node.
// TODO: This is a workaround for issue #54108
// Currently local attach plugins such as FC, iSCSI, RBD can't obtain devicePath during
// GenerateUnmapDeviceFunc() in operation_generator. As a result, these plugins fail to get
// and remove loopback device then it will be remained on kubelet node. To avoid the problem,
// local attach plugins needs to remove loopback device during TearDownDevice().
blkUtil := volumepathhandler.NewBlockVolumePathHandler()
loop, err := volumepathhandler.BlockVolumePathHandler.GetLoopDevice(blkUtil, devicePath)
if err != nil {
if err.Error() != volumepathhandler.ErrDeviceNotFound {
return fmt.Errorf("failed to get loopback for device: %v, err: %v", devicePath, err)
}
glog.Warningf("iscsi: loopback for device: %s not found", device)
}
// Detach a volume from kubelet node
err = util.detachISCSIDisk(c.exec, portals, iqn, iface, volName, initiatorName, found)
if err != nil {
return fmt.Errorf("failed to finish detachISCSIDisk, err: %v", err)
}
if len(loop) != 0 {
// The volume was successfully detached from node. We can safely remove the loopback.
err = volumepathhandler.BlockVolumePathHandler.RemoveLoopDevice(blkUtil, loop)
if err != nil {
return fmt.Errorf("failed to remove loopback :%v, err: %v", loop, err)
}
}
return nil
}