1 files changed, 24 insertions, 0 deletions
diff --git a/pkg/osutil/fileutil_linux.go b/pkg/osutil/fileutil_linux.go
new file mode 100644
index 000000000..415c00353
--- /dev/null
+++ b/pkg/osutil/fileutil_linux.go
@@ -0,0 +1,24 @@
+// Copyright 2017 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+
+package osutil
+
+import (
+	"io/ioutil"
+	"path/filepath"
+	"syscall"
+	"unsafe"
+)
+
+// UmountAll recurusively unmounts all mounts in dir.
+func UmountAll(dir string) {
+	files, _ := ioutil.ReadDir(dir)
+	for _, f := range files {
+		name := filepath.Join(dir, f.Name())
+		if f.IsDir() {
+			UmountAll(name)
+		}
+		fn := []byte(name + "\x00")
+		syscall.Syscall(syscall.SYS_UMOUNT2, uintptr(unsafe.Pointer(&fn[0])), syscall.MNT_FORCE, 0)
+	}
+}