diff --git a/fs/namespace.c b/fs/namespace.c
index 2fd0bf91aa77..3441aa0edbef 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -42,6 +42,33 @@ static unsigned int m_hash_shift __read_mostly;
 static unsigned int mp_hash_mask __read_mostly;
 static unsigned int mp_hash_shift __read_mostly;
 
+# UMOUNT Backport
+static int can_umount(const struct path *path, int flags)
+{
+    struct mount *mnt = real_mount(path->mnt);
+    if (!may_mount())
+        return -EPERM;
+    if (!path_mounted(path))
+        return -EINVAL;
+    if (!check_mnt(mnt))
+        return -EINVAL;
+    if (mnt->mnt.mnt_flags & MNT_LOCKED)
+        return -EINVAL;
+    if (flags & MNT_FORCE && !capable(CAP_SYS_ADMIN))
+        return -EPERM;
+    return 0;
+}
+int path_umount(struct path *path, int flags)
+{
+    struct mount *mnt = real_mount(path->mnt);
+    int ret;
+
+    ret = can_umount(path, flags);
+    if (!ret)
+        ret = do_umount(mnt, flags);
+    return ret;
+}
+
 static __initdata unsigned long mhash_entries;
 static int __init set_mhash_entries(char *str)
 {
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 773492ba2e6e..a120d0c74f32 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -46,6 +46,9 @@
 #include <uapi/linux/fs.h>
 #include <linux/android_vendor.h>
 
+// In fs/namespace.c
+EXPORT_SYMBOL(path_umount);
+
 struct backing_dev_info;
 struct bdi_writeback;
 struct bio;