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Fix for Premature iSCSI logout #39202.

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This commit is contained in:
Cristian Pop 2016-12-23 16:42:13 +02:00
parent 739f4ffe0e
commit b0d285c706
1 changed files with 42 additions and 10 deletions
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52
pkg/volume/iscsi/iscsi_util.go Normal file → Executable file
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@ -90,21 +90,22 @@ func getDevicePrefixRefCount(mounter mount.Interface, deviceNamePrefix string) (
return refCount, nil
}
// make a directory like /var/lib/kubelet/plugins/kubernetes.io/iscsi/portal-some_iqn-lun-lun_id
func makePDNameInternal(host volume.VolumeHost, portal string, iqn string, lun string) string {
return path.Join(host.GetPluginDir(iscsiPluginName), portal+"-"+iqn+"-lun-"+lun)
// make a directory like /var/lib/kubelet/plugins/kubernetes.io/iscsi/iface_name/portal-some_iqn-lun-lun_id
func makePDNameInternal(host volume.VolumeHost, portal string, iqn string, lun string, iface string) string {
return path.Join(host.GetPluginDir(iscsiPluginName), iface, portal+"-"+iqn+"-lun-"+lun)
}
type ISCSIUtil struct{}
func (util *ISCSIUtil) MakeGlobalPDName(iscsi iscsiDisk) string {
return makePDNameInternal(iscsi.plugin.host, iscsi.portals[0], iscsi.iqn, iscsi.lun)
return makePDNameInternal(iscsi.plugin.host, iscsi.portals[0], iscsi.iqn, iscsi.lun, iscsi.iface)
}
func (util *ISCSIUtil) AttachDisk(b iscsiDiskMounter) error {
var devicePath string
var devicePaths []string
var iscsiTransport string
out, err := b.plugin.execCommand("iscsiadm", []string{"-m", "iface", "-I", b.iface, "-o", "show"})
if err != nil {
glog.Errorf("iscsi: could not read iface %s error: %s", b.iface, string(out))
@ -112,8 +113,16 @@ func (util *ISCSIUtil) AttachDisk(b iscsiDiskMounter) error {
}
iscsiTransport = extractTransportname(string(out))
bkpPortal := b.portals
for _, tp := range bkpPortal {
// Rescan sessions to discover newly mapped LUNs. Do not specify the interface when rescanning
// to avoid establishing additional sessions to the same target.
out, err := b.plugin.execCommand("iscsiadm", []string{"-m", "node", "-p", tp, "-T", b.iqn, "-R"})
if err != nil {
glog.Errorf("iscsi: failed to rescan session with error: %s (%v)", string(out), err)
}
if iscsiTransport == "" {
glog.Errorf("iscsi: could not find transport name in iface %s", b.iface)
return errors.New(fmt.Sprintf("Could not parse iface file for %s", b.iface))
@ -209,14 +218,20 @@ func (util *ISCSIUtil) DetachDisk(c iscsiDiskUnmounter, mntPath string) error {
refCount, err := getDevicePrefixRefCount(c.mounter, prefix)
if err == nil && refCount == 0 {
// this portal/iqn are no longer referenced, log out
// this portal/iqn/iface are no longer referenced, log out
// extract iface from mount path
iface, err := extractIface(mntPath)
if err != nil {
return err
}
// extract portal and iqn from device path
portal, iqn, err := extractPortalAndIqn(device)
if err != nil {
return err
}
glog.Infof("iscsi: log out target %s iqn %s", portal, iqn)
out, err := c.plugin.execCommand("iscsiadm", []string{"-m", "node", "-p", portal, "-T", iqn, "--logout"})
glog.Infof("iscsi: log out target %s iqn %s iface %s", portal, iqn, iface)
// logout may fail as no session may exist for the portal/IQN on the specified interface
out, err := c.plugin.execCommand("iscsiadm", []string{"-m", "node", "-p", portal, "-T", iqn, "-I", iface, "--logout"})
if err != nil {
glog.Errorf("iscsi: failed to detach disk Error: %s", string(out))
}
@ -248,15 +263,32 @@ func extractDeviceAndPrefix(mntPath string) (string, string, error) {
return "", "", fmt.Errorf("iscsi detach disk: malformatted mnt path: %s", mntPath)
}
device := mntPath[(ind + 1):]
// strip -lun- from device path
ind = strings.LastIndex(device, "-lun-")
// strip -lun- from mount path
ind = strings.LastIndex(mntPath, "-lun-")
if ind < 0 {
return "", "", fmt.Errorf("iscsi detach disk: malformatted mnt path: %s", mntPath)
}
prefix := device[:ind]
prefix := mntPath[:ind]
return device, prefix, nil
}
func extractIface(mntPath string) (string, error) {
ind := strings.LastIndex(mntPath, "/")
if ind < 0 {
return "", fmt.Errorf("iscsi detach disk: malformatted mnt path: %s", mntPath)
}
baseMntPath := mntPath[:ind]
ind = strings.LastIndex(baseMntPath, "/")
if ind < 0 {
return "", fmt.Errorf("iscsi detach disk: malformatted mnt path: %s", mntPath)
}
iface := baseMntPath[(ind + 1):]
return iface, nil
}
func extractPortalAndIqn(device string) (string, string, error) {
ind1 := strings.Index(device, "-")
if ind1 < 0 {