--- a/fs/open.c
+++ i/fs/open.c
@@ -60,7 +60,12 @@ int do_truncate(struct user_namespace *m
 	if (ret)
 		newattrs.ia_valid |= ret | ATTR_FORCE;
 
+wait:	inode_dio_wait(dentry->d_inode);
 	inode_lock(dentry->d_inode);
+	if (atomic_read(&dentry->d_inode->i_dio_count)) {
+		inode_unlock(dentry->d_inode);
+		goto wait;
+	}
 	/* Note any delegations or leases have already been broken: */
 	ret = notify_change(mnt_userns, dentry, &newattrs, NULL);
 	inode_unlock(dentry->d_inode);