--- linux-2.6.11.2/drivers/block/loop.c.orig	2005-03-10 23:22:12.000000000 -0800
+++ linux-2.6.11.2/drivers/block/loop.c	2005-03-10 23:22:21.000000000 -0800
@@ -608,6 +608,12 @@
 	if (get_loop_size(lo, file) != get_loop_size(lo, old_file))
 		goto out_putf;
 
+	if (old_file->f_op && old_file->f_op->flush) {
+		error = old_file->f_op->flush(old_file);
+		if (error)
+			goto out_putf;
+	}
+
 	/* and ... switch */
 	error = loop_switch(lo, file);
 	if (error)
@@ -820,6 +826,10 @@
 	bd_set_size(bdev, 0);
 	mapping_set_gfp_mask(filp->f_mapping, gfp);
 	lo->lo_state = Lo_unbound;
+
+	if (filp->f_op && filp->f_op->flush)
+		filp->f_op->flush(filp);
+
 	fput(filp);
 	/* This is safe: open() is still holding a reference. */
 	module_put(THIS_MODULE);