This was item #14 on the todo list for reiser4 inclusion in mainline:

diff --git a/fs/reiser4/page_cache.c b/fs/reiser4/page_cache.c
index fe71368..a662c25 100644
--- a/fs/reiser4/page_cache.c
+++ b/fs/reiser4/page_cache.c
@@ -467,15 +467,14 @@ int reiser4_set_page_dirty_internal(struct page *page)
  	BUG_ON(mapping == NULL);

  	if (!TestSetPageDirty(page)) {
+		spin_lock_irq(&mapping->tree_lock);
  		if (mapping_cap_account_dirty(mapping))
  			inc_zone_page_state(page, NR_FILE_DIRTY);
-
+		radix_tree_tag_set(&mapping->page_tree,
+			page_index(page), PAGECACHE_TAG_DIRTY);
  		__mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
+		spin_unlock_irq(&mapping->tree_lock);
  	}
-
-	/* znode must be dirty ? */
-	if (mapping->host == reiser4_get_super_fake(mapping->host->i_sb))
-		assert("", JF_ISSET(jprivate(page), JNODE_DIRTY));
  	return 0;
  }

-Ryan
--
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