--- x/include/linux/fs.h
+++ y/include/linux/fs.h
@@ -758,6 +758,7 @@ static inline void inode_lock(struct ino
 
 static inline void inode_unlock(struct inode *inode)
 {
+	lockdep_assert_held_write(&inode->i_rwsem);
 	up_write(&inode->i_rwsem);
 }