diff --git a/VolumeManager.cpp b/VolumeManager.cpp
index 6f783a2..f1667f2 100755
--- a/VolumeManager.cpp
+++ b/VolumeManager.cpp
@@ -59,6 +59,7 @@
 #include "Asec.h"
 #include "VoldUtil.h"
 #include "cryptfs.h"
+#include "fstrim.h"
 
 #define MASS_STORAGE_FILE_PATH  "/sys/class/android_usb/android0/f_mass_storage/lun/file"
 
@@ -405,6 +406,22 @@
     return android::vold::Benchmark(path, sysPath);
 }
 
+int VolumeManager::forgetPartition(const std::string& partGuid) {
+    std::string normalizedGuid;
+    if (android::vold::NormalizeHex(partGuid, normalizedGuid)) {
+        LOG(WARNING) << "Invalid GUID " << partGuid;
+        return -1;
+    }
+
+    std::string keyPath = android::vold::BuildKeyPath(normalizedGuid);
+    if (unlink(keyPath.c_str()) != 0) {
+        LOG(ERROR) << "Failed to unlink " << keyPath;
+        return -1;
+    }
+
+    return 0;
+}
+
 int VolumeManager::linkPrimary(userid_t userId) {
     std::string source(mPrimary->getPath());
     if (mPrimary->getType() == android::vold::VolumeBase::Type::kEmulated) {