ceph: decode v5 of osdmap (pool names) [protocol change]

Teach the client to decode an updated format for the osdmap.  The new
format includes pool names, which will be useful shortly.  Get this change
in earlier rather than later.

Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/osdmap.h b/fs/ceph/osdmap.h
index 1fb55af..8bc9f1e 100644
--- a/fs/ceph/osdmap.h
+++ b/fs/ceph/osdmap.h
@@ -23,6 +23,7 @@
 	int id;
 	struct ceph_pg_pool v;
 	int pg_num_mask, pgp_num_mask, lpg_num_mask, lpgp_num_mask;
+	char *name;
 };
 
 struct ceph_pg_mapping {