ceph: do not confuse stale and dead (unreconnected) caps

We were using the cap_gen to track both stale caps (caps that timed out
due to temporarily losing touch with the mds) and dead caps that did not
reconnect after an MDS failure.  Introduce a recon_gen counter to track
reconnections to restarted MDSs and kill dead caps based on that instead.

Rename gen to cap_gen while we're at it to make it more clear which is
which.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index f566e9c84295..c0846b1c482b 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -98,6 +98,8 @@ struct ceph_mds_session {
         u64               s_seq;      /* incoming msg seq # */
         struct mutex      s_mutex;    /* serialize session messages */
 
+        int               s_recon_gen; /* inc on reconnect to recovered mds */
+
         struct ceph_connection s_con;
 
         /* protected by s_cap_lock */