Fill out mpath suspend/resume functions so queued I/O without a path is errored.
--- diff/drivers/md/dm-mpath.c	2005-01-12 19:02:42.000000000 +0000
+++ source/drivers/md/dm-mpath.c	2005-01-12 19:13:36.000000000 +0000
@@ -60,6 +60,7 @@
 	unsigned pg_init_required;	/* pg_init needs calling? */
 	unsigned queue_io;		/* Must we queue all I/O? */
 	unsigned queue_if_no_path;	/* Queue I/O if last path fails? */
+	unsigned suspended;
 
 	spinlock_t lock;
 	unsigned nr_valid_paths;
@@ -263,7 +264,8 @@
 
 	pgpath = m->current_pgpath;
 
-	if ((pgpath && m->queue_io) || (!pgpath && m->queue_if_no_path))
+	if ((pgpath && m->queue_io) ||
+	    (!pgpath && m->queue_if_no_path && !m->suspended))
 		must_queue = 1;
 
 	if (was_queued)
@@ -351,7 +353,8 @@
 
 	pgpath = m->current_pgpath;
 
-	if ((pgpath && m->queue_io) || (!pgpath && m->queue_if_no_path))
+	if ((pgpath && m->queue_io) ||
+	    (!pgpath && m->queue_if_no_path && !m->suspended))
 		must_queue = 1;
 
 	init_required = m->pg_init_required;
@@ -908,18 +911,30 @@
 	return r;
 }
 
+/*
+ * Suspend can't complete until all the I/O is processed so if
+ * the last path failed we will now error any queued I/O.
+ */
 static void multipath_presuspend(struct dm_target *ti)
 {
 	struct multipath *m = (struct multipath *) ti->private;
+	unsigned long flags;
 
-
+	spin_lock_irqsave(&m->lock, flags);
+	m->suspended = 1;
+	if (m->queue_if_no_path)
+		schedule_work(&m->process_queued_ios);
+	spin_unlock_irqrestore(&m->lock, flags);
 }
 
 static void multipath_resume(struct dm_target *ti)
 {
 	struct multipath *m = (struct multipath *) ti->private;
+	unsigned long flags;
 
-
+	spin_lock_irqsave(&m->lock, flags);
+	m->suspended = 0;
+	spin_unlock_irqrestore(&m->lock, flags);
 }
 
 /*