[PATCH] JBD: journal_dirty_metadata diagnostics

Try to trap some more state when an assertion which cannot happen happens.

fs/jbd/transaction.c

@@ -1111,6 +1111,16 @@ int journal_dirty_metadata(handle_t *handle, struct buffer_head *bh)
 	if (jh->b_transaction == handle->h_transaction &&
 					jh->b_jlist == BJ_Metadata) {
 		JBUFFER_TRACE(jh, "fastpath");
+		console_verbose();
+		if (jh->b_transaction != journal->j_running_transaction) {
+			printk("jh->b_transaction=%p\n", jh->b_transaction);
+			printk("journal->j_running_transaction=%p\n",
+				journal->j_running_transaction);
+			printk("handle->h_transaction=%p\n",
+				handle->h_transaction);
+			printk("journal->j_committing_transaction=%p\n",
+				journal->j_committing_transaction);
+		}
 		J_ASSERT_JH(jh, jh->b_transaction ==
 					journal->j_running_transaction);
 		goto out_unlock_bh;

kernel/ksyms.c

@@ -604,5 +604,6 @@ EXPORT_SYMBOL(__per_cpu_offset);
 /* debug */
 EXPORT_SYMBOL(dump_stack);
 EXPORT_SYMBOL(ptrace_notify);
+EXPORT_SYMBOL(console_printk);
 
 EXPORT_SYMBOL(current_kernel_time);