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Update comments for getting and removing loopback device at iSCSI,FC,RBD

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This PR add comments for the background why plugin gets loopback
device and removes loopback device even if operation_generator has
same functionality.
This commit is contained in:
Mitsuhiro Tanino
2018-01-17 10:18:51 -05:00
parent 20f27a77ee
commit 6fa583381e
3 changed files with 17 additions and 2 deletions
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6
pkg/volume/rbd/rbd.go
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@@ -921,6 +921,12 @@ func (rbd *rbdDiskUnmapper) TearDownDevice(mapPath, _ string) error {
if err != nil {
return fmt.Errorf("rbd: failed to get loopback for device: %v, err: %v", device, err)
}
// Get loopback device which takes fd lock for device beofore 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 := volutil.NewBlockVolumePathHandler()
loop, err := volutil.BlockVolumePathHandler.GetLoopDevice(blkUtil, device)
if err != nil {