ceph: track laggy state of mds from mdsmap

Signed-off-by: Sage Weil <sage@newdream.net>

fs/ceph/mds_client.c

@@ -2377,9 +2377,11 @@ static void check_new_map(struct ceph_mds_client *mdsc,
 		oldstate = ceph_mdsmap_get_state(oldmap, i);
 		newstate = ceph_mdsmap_get_state(newmap, i);
 
-		dout("check_new_map mds%d state %s -> %s (session %s)\n",
+		dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
 		     i, ceph_mds_state_name(oldstate),
+		     ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
 		     ceph_mds_state_name(newstate),
+		     ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
 		     session_state_name(s->s_state));
 
 		if (memcmp(ceph_mdsmap_get_addr(oldmap, i),

fs/ceph/mdsmap.c

@@ -85,6 +85,7 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
 		struct ceph_entity_addr addr;
 		u32 num_export_targets;
 		void *pexport_targets = NULL;
+		struct ceph_timespec laggy_since;
 
 		ceph_decode_need(p, end, sizeof(u64)*2 + 1 + sizeof(u32), bad);
 		global_id = ceph_decode_64(p);
@@ -103,7 +104,7 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
 		state_seq = ceph_decode_64(p);
 		ceph_decode_copy(p, &addr, sizeof(addr));
 		ceph_decode_addr(&addr);
-		*p += sizeof(struct ceph_timespec);
+		ceph_decode_copy(p, &laggy_since, sizeof(laggy_since));
 		*p += sizeof(u32);
 		ceph_decode_32_safe(p, end, namelen, bad);
 		*p += namelen;
@@ -122,6 +123,9 @@ struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end)
 			m->m_info[mds].global_id = global_id;
 			m->m_info[mds].state = state;
 			m->m_info[mds].addr = addr;
+			m->m_info[mds].laggy =
+				(laggy_since.tv_sec != 0 ||
+				 laggy_since.tv_nsec != 0);
 			m->m_info[mds].num_export_targets = num_export_targets;
 			if (num_export_targets) {
 				m->m_info[mds].export_targets =

fs/ceph/mdsmap.h

@@ -13,6 +13,7 @@ struct ceph_mds_info {
 	struct ceph_entity_addr addr;
 	s32 state;
 	int num_export_targets;
+	bool laggy;
 	u32 *export_targets;
 };
 
@@ -47,6 +48,13 @@ static inline int ceph_mdsmap_get_state(struct ceph_mdsmap *m, int w)
 	return m->m_info[w].state;
 }
 
+static inline bool ceph_mdsmap_is_laggy(struct ceph_mdsmap *m, int w)
+{
+	if (w >= 0 && w < m->m_max_mds)
+		return m->m_info[w].laggy;
+	return false;
+}
+
 extern int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m);
 extern struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end);
 extern void ceph_mdsmap_destroy(struct ceph_mdsmap *m);