diff --git a/include/linux/fs.h b/include/linux/fs.h
index bb29b02d9bb6..bd0a1b2f3c02 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -467,6 +467,16 @@ struct block_device {
 
 int mapping_tagged(struct address_space *mapping, int tag);
 
+static inline void i_mmap_lock_write(struct address_space *mapping)
+{
+	mutex_lock(&mapping->i_mmap_mutex);
+}
+
+static inline void i_mmap_unlock_write(struct address_space *mapping)
+{
+	mutex_unlock(&mapping->i_mmap_mutex);
+}
+
 /*
  * Might pages of this file be mapped into userspace?
  */