[XFS] Move the pagebuf_runall_queues out from under a spinlock, if it

sleeps (which it might), this is not the right place for it to
be. There is also no reason for it to be under a spinlock.

SGI Modid: 2.5.x-xfs:slinx:151032a

fs/xfs/pagebuf/page_buf.c

@@ -1689,11 +1689,11 @@ pagebuf_delwri_flush(
 	int			pincount = 0;
 	int			flush_cnt = 0;
 
+	pagebuf_runall_queues(pagebuf_dataio_workqueue);
+
 	spin_lock(&pbd_delwrite_lock);
 	INIT_LIST_HEAD(&tmp);
 
-	pagebuf_runall_queues(pagebuf_dataio_workqueue);
-
 	list_for_each_safe(curr, next, &pbd_delwrite_queue) {
 		pb = list_entry(curr, page_buf_t, pb_list);