[PATCH] Use freezeable workqueues in XFS

Make the workqueues used by XFS freezeable, so their worker threads don't
submit any I/O after the suspend image has been created.

Signed-off-by: Rafael J. Wysocki <[e-mail]>
Acked-by: Pavel Machek <[e-mail]>
Cc: Nigel Cunningham <[e-mail]>
Cc: David Chinner <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

fs/xfs/linux-2.6/xfs_buf.c

···
 	if (!xfs_buf_zone)
 		goto out_free_trace_buf;
 
-	xfslogd_workqueue = create_workqueue("xfslogd");
+	xfslogd_workqueue = create_freezeable_workqueue("xfslogd");
 	if (!xfslogd_workqueue)
 		goto out_free_buf_zone;
 
-	xfsdatad_workqueue = create_workqueue("xfsdatad");
+	xfsdatad_workqueue = create_freezeable_workqueue("xfsdatad");
 	if (!xfsdatad_workqueue)
 		goto out_destroy_xfslogd_workqueue;