diff --git a/fs/open.c b/fs/open.c
index daa324606a41..9ec3cfca3b1a 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -856,8 +856,11 @@ static int do_dentry_open(struct file *f,
 		 * of THPs into the page cache will fail.
 		 */
 		smp_mb();
-		if (filemap_nr_thps(inode->i_mapping))
+		if (filemap_nr_thps(inode->i_mapping)) {
+			filemap_invalidate_lock(inode->i_mapping);
 			truncate_pagecache(inode, 0);
+			filemap_invalidate_unlock(inode->i_mapping);
+		}
 	}
 
 	return 0;