From 579a7ca7e71bf7ca78e7dcce0699333cbae259e6 Mon Sep 17 00:00:00 2001
From: Tao Ma <tao.ma@oracle.com>
Date: Mon, 1 Feb 2010 17:05:33 +0800
Subject: [PATCH] --- yaml --- r: 180360 b: refs/heads/master c:
 0a1ea437d87af830786605813972e8e277992917 h: refs/heads/master v: v3

---
 [refs]                        | 2 +-
 trunk/fs/ocfs2/refcounttree.c | 8 ++++++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index b2e2497ea470..5fd96e2d222f 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d622b89a2f58613a9c1407b22b02aecdd2187a7c
+refs/heads/master: 0a1ea437d87af830786605813972e8e277992917
diff --git a/trunk/fs/ocfs2/refcounttree.c b/trunk/fs/ocfs2/refcounttree.c
index 5b64468de0b0..8ae65c9c020c 100644
--- a/trunk/fs/ocfs2/refcounttree.c
+++ b/trunk/fs/ocfs2/refcounttree.c
@@ -2957,8 +2957,12 @@ static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
 
 		page = grab_cache_page(mapping, page_index);
 
-		/* This page can't be dirtied before we CoW it out. */
-		BUG_ON(PageDirty(page));
+		/*
+		 * In case PAGE_CACHE_SIZE <= CLUSTER_SIZE, This page
+		 * can't be dirtied before we CoW it out.
+		 */
+		if (PAGE_CACHE_SIZE <= OCFS2_SB(sb)->s_clustersize)
+			BUG_ON(PageDirty(page));
 
 		if (!PageUptodate(page)) {
 			ret = block_read_full_page(page, ocfs2_get_block);