fix smb unmount issue on Windows

pkg/util/mount/BUILD

@@ -9,7 +9,9 @@ go_library(
         "exec_mount_unsupported.go",
         "fake.go",
         "mount.go",
-        "mount_helper.go",
+        "mount_helper_common.go",
+        "mount_helper_unix.go",
+        "mount_helper_windows.go",
         "mount_linux.go",
         "mount_unsupported.go",
         "mount_windows.go",

pkg/util/mount/mount_helper.go → pkg/util/mount/mount_helper_common.go

@@ -19,7 +19,6 @@ package mount
 import (
 	"fmt"
 	"os"
-	"syscall"
 
 	"k8s.io/klog"
 )
@@ -102,23 +101,3 @@ func PathExists(path string) (bool, error) {
 		return false, err
 	}
 }
-
-// IsCorruptedMnt return true if err is about corrupted mount point
-func IsCorruptedMnt(err error) bool {
-	if err == nil {
-		return false
-	}
-	var underlyingError error
-	switch pe := err.(type) {
-	case nil:
-		return false
-	case *os.PathError:
-		underlyingError = pe.Err
-	case *os.LinkError:
-		underlyingError = pe.Err
-	case *os.SyscallError:
-		underlyingError = pe.Err
-	}
-
-	return underlyingError == syscall.ENOTCONN || underlyingError == syscall.ESTALE || underlyingError == syscall.EIO || underlyingError == syscall.EACCES
-}

pkg/util/mount/mount_helper_unix.go

+// +build !windows
+
+/*
+Copyright 2019 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 mount
+
+import (
+	"os"
+	"syscall"
+)
+
+// IsCorruptedMnt return true if err is about corrupted mount point
+func IsCorruptedMnt(err error) bool {
+	if err == nil {
+		return false
+	}
+	var underlyingError error
+	switch pe := err.(type) {
+	case nil:
+		return false
+	case *os.PathError:
+		underlyingError = pe.Err
+	case *os.LinkError:
+		underlyingError = pe.Err
+	case *os.SyscallError:
+		underlyingError = pe.Err
+	}
+
+	return underlyingError == syscall.ENOTCONN || underlyingError == syscall.ESTALE || underlyingError == syscall.EIO || underlyingError == syscall.EACCES
+}

pkg/util/mount/mount_helper_windows.go

+// +build windows
+
+/*
+Copyright 2019 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 mount
+
+import (
+	"os"
+	"syscall"
+
+	"k8s.io/klog"
+)
+
+// following failure codes are from https://docs.microsoft.com/en-us/windows/desktop/debug/system-error-codes--1300-1699-
+// ERROR_BAD_NETPATH                 = 53
+// ERROR_NETWORK_BUSY                = 54
+// ERROR_UNEXP_NET_ERR               = 59
+// ERROR_NETNAME_DELETED             = 64
+// ERROR_NETWORK_ACCESS_DENIED       = 65
+// ERROR_BAD_DEV_TYPE                = 66
+// ERROR_BAD_NET_NAME                = 67
+// ERROR_SESSION_CREDENTIAL_CONFLICT = 1219
+// ERROR_LOGON_FAILURE               = 1326
+var errorNoList = [...]int{53, 54, 59, 64, 65, 66, 67, 1219, 1326}
+
+// IsCorruptedMnt return true if err is about corrupted mount point
+func IsCorruptedMnt(err error) bool {
+	if err == nil {
+		return false
+	}
+
+	var underlyingError error
+	switch pe := err.(type) {
+	case nil:
+		return false
+	case *os.PathError:
+		underlyingError = pe.Err
+	case *os.LinkError:
+		underlyingError = pe.Err
+	case *os.SyscallError:
+		underlyingError = pe.Err
+	}
+
+	if ee, ok := underlyingError.(syscall.Errno); ok {
+		for _, errno := range errorNoList {
+			if int(ee) == errno {
+				klog.Warningf("IsCorruptedMnt failed with error: %v, error code: %v", err, errno)
+				return true
+			}
+		}
+	}
+
+	return false
+}

pkg/util/mount/mount_windows.go

@@ -378,14 +378,15 @@ func getAllParentLinks(path string) ([]string, error) {
 
 // GetMountRefs : empty implementation here since there is no place to query all mount points on Windows
 func (mounter *Mounter) GetMountRefs(pathname string) ([]string, error) {
-	pathExists, pathErr := PathExists(normalizeWindowsPath(pathname))
-	// TODO(#75012): Need a Windows specific IsCorruptedMnt function that checks against whatever errno's
-	// Windows emits when we try to Stat a corrupted mount
-	// https://golang.org/pkg/syscall/?GOOS=windows&GOARCH=amd64#Errno
+	windowsPath := normalizeWindowsPath(pathname)
+	pathExists, pathErr := PathExists(windowsPath)
 	if !pathExists {
 		return []string{}, nil
+	} else if IsCorruptedMnt(pathErr) {
+		klog.Warningf("GetMountRefs found corrupted mount at %s, treating as unmounted path", windowsPath)
+		return []string{}, nil
 	} else if pathErr != nil {
-		return nil, fmt.Errorf("error checking path %s: %v", normalizeWindowsPath(pathname), pathErr)
+		return nil, fmt.Errorf("error checking path %s: %v", windowsPath, pathErr)
 	}
 	return []string{pathname}, nil
 }