diff --git a/fs/inode.c b/fs/inode.c
index 16fefd3..a21d5a9 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -25,6 +25,7 @@
 #include <linux/async.h>
 #include <linux/posix_acl.h>
 #include <linux/ima.h>
+#include <linux/cred.h>
 
 /*
  * This is needed for the following functions:
@@ -1733,3 +1734,19 @@
 	inode->i_mode = mode;
 }
 EXPORT_SYMBOL(inode_init_owner);
+
+/*
+ * return true if current either has CAP_FOWNER to the
+ * file, or owns the file.
+ */
+bool is_owner_or_cap(const struct inode *inode)
+{
+	struct user_namespace *ns = inode_userns(inode);
+
+	if (current_user_ns() == ns && current_fsuid() == inode->i_uid)
+		return true;
+	if (ns_capable(ns, CAP_FOWNER))
+		return true;
+	return false;
+}
+EXPORT_SYMBOL(is_owner_or_cap);