ceph: track laggy state of mds from mdsmap

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

3 files changed, 16 insertions, 2 deletions

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 774407f96ff1..6e40db2a0014 100644
--- a/fs/ceph/mds_client.c
+++ b/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),
diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c
index c4c498e6dfef..040be6d1150b 100644
--- a/fs/ceph/mdsmap.c
+++ b/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 =
diff --git a/fs/ceph/mdsmap.h b/fs/ceph/mdsmap.h
index eacc131aa5cb..4c5cb0880bba 100644
--- a/fs/ceph/mdsmap.h
+++ b/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);