--- zzzz-none-000/linux-2.6.13.1/fs/open.c	2005-09-10 02:42:58.000000000 +0000
+++ ohio-7170-487/linux-2.6.13.1/fs/open.c	2006-06-09 13:32:28.000000000 +0000
@@ -27,6 +27,19 @@
 
 #include <asm/unistd.h>
 
+/*****************************************************************************
+ * <<<< 20060608 =OS= -- sync-on-demand
+ *****************************************************************************/
+
+#include <asm/atomic.h>
+#include <linux/writeback.h>
+
+extern int		file_io_controller(void);
+extern int		max_rest_dirty_pages;
+extern atomic_t		f_global_dirt;
+
+/*****************************************************************************/
+
 int vfs_statfs(struct super_block *sb, struct kstatfs *buf)
 {
 	int retval = -ENODEV;
@@ -790,6 +803,9 @@
 			goto cleanup_file;
 	}
 
+	f->f_dirt = 0;		/* <<<< 20060608 =OS= */
+	file_io_controller();
+
 	f->f_mapping = inode->i_mapping;
 	f->f_dentry = dentry;
 	f->f_vfsmnt = mnt;
@@ -991,6 +1007,15 @@
 		retval = filp->f_op->flush(filp);
 
 	dnotify_flush(filp, id);
+	
+	/* <<<< 20060608 =OS= */
+	atomic_add (filp->f_dirt, &f_global_dirt);
+	if (atomic_read (&f_global_dirt) > max_rest_dirty_pages) {
+		atomic_set (&f_global_dirt, 0);
+		wakeup_pdflush(0);
+	}
+	file_io_controller();
+
 	locks_remove_posix(filp, id);
 	fput(filp);
 	return retval;