diff --git a/fs/buffer.c b/fs/buffer.c
index 3b11607..460f1c4 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2834,7 +2834,7 @@
 	int ret = 0;
 
 	BUG_ON(!PageLocked(page));
-	if (PageDirty(page) || PageWriteback(page))
+	if (PageWriteback(page))
 		return 0;
 
 	if (mapping == NULL) {		/* can this still happen? */
@@ -2845,6 +2845,19 @@
 	spin_lock(&mapping->private_lock);
 	ret = drop_buffers(page, &buffers_to_free);
 	spin_unlock(&mapping->private_lock);
+
+	/*
+	 * If the filesystem writes its buffers by hand (eg ext3)
+	 * then we can have clean buffers against a dirty page.  We
+	 * clean the page here; otherwise the VM will never notice
+	 * that the filesystem did any IO at all.
+	 *
+	 * Also, during truncate, discard_buffer will have marked all
+	 * the page's buffers clean.  We discover that here and clean
+	 * the page also.
+	 */
+	if (ret)
+		cancel_dirty_page(page, PAGE_CACHE_SIZE);
 out:
 	if (buffers_to_free) {
 		struct buffer_head *bh = buffers_to_free;