patch-2.4.27 linux-2.4.27/fs/jbd/transaction.c

• Lines: 36
• Date: 2004-08-07 16:26:05.985401468 -0700
• Orig file: linux-2.4.26/fs/jbd/transaction.c
• Orig date: 2004-02-18 05:36:31.000000000 -0800

diff -urN linux-2.4.26/fs/jbd/transaction.c linux-2.4.27/fs/jbd/transaction.c
@@ -1694,6 +1694,23 @@
 	return 0;
 }
 
+void debug_page(struct page *p)
+{
+	struct buffer_head *bh;
+
+	bh = p->buffers;
+
+	printk(KERN_ERR "%s: page index:%lu count:%d flags:%lx\n", __FUNCTION__,
+		 p->index, atomic_read(&p->count), p->flags);
+
+	while (bh) {
+		printk(KERN_ERR "%s: bh b_next:%p blocknr:%lu b_list:%u state:%lx\n",
+			__FUNCTION__, bh->b_next, bh->b_blocknr, bh->b_list,
+				bh->b_state);
+		bh = bh->b_this_page;
+	} 
+}
+
 
 /** 
  * int journal_try_to_free_buffers() - try to free page buffers.
@@ -1752,6 +1769,11 @@
 	do {
 		struct buffer_head *p = tmp;
 
+		if (unlikely(!tmp)) {
+			debug_page(page);
+			BUG();
+		}
+			
 		tmp = tmp->b_this_page;
 		if (buffer_jbd(p))
 			if (!__journal_try_to_free_buffer(p, &locked_or_dirty))