diff --git a/fs/block_dev.c b/fs/block_dev.c
index f286805..ff77262 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -387,6 +387,10 @@
 	struct inode *bd_inode = filp->f_mapping->host;
 	struct block_device *bdev = I_BDEV(bd_inode);
 	int error;
+	
+	error = filemap_write_and_wait_range(filp->f_mapping, start, end);
+	if (error)
+		return error;
 
 	/*
 	 * There is no need to serialise calls to blkdev_issue_flush with