--- 2.3.15-pre1-ramdisk/drivers/block/rd.c	Fri Aug 20 20:58:03 1999
+++ 2.3.15-pre1-ramdisk-page-cache/drivers/block/rd.c	Fri Aug 20 21:31:32 1999
@@ -217,9 +217,24 @@
 	 * If we're writing, we protect the buffer.
   	 */
 
-	if (CURRENT->cmd == READ) 
-		memset(CURRENT->buffer, 0, len); 
-	else
+	if (CURRENT->cmd == READ)
+	{
+		struct buffer_head * bh, * oldbh;
+
+		bh = CURRENT->bh; /* can the req->bh be null? I think no... */
+		oldbh = get_hash_table(bh->b_rdev, bh->b_blocknr, bh->b_size);
+		if (!oldbh)
+			memset(bh->b_data, 0, len);
+		else
+		{
+			memcpy(bh->b_data, oldbh->b_data, bh->b_size);
+			if (test_and_clear_bit(BH_Protected, &oldbh->b_state))
+				set_bit(BH_Protected, &bh->b_state);
+			if (atomic_set_buffer_clean(oldbh))
+				set_bit(BH_Protected, &bh->b_state);
+			atomic_dec(&oldbh->b_count);
+		}
+	} else
 		set_bit(BH_Protected, &CURRENT->bh->b_state);
 
 	end_request(1);