ceph: don't reset s_cap_ttl to zero

Avoid the need to check for a special zero s_cap_ttl value by just
using (jiffies - 1) as the value assigned to indicate "sometime in
the past."

Signed-off-by: Alex Elder <elder@dreamhost.com>
Reviewed-by: Sage Weil <sage@newdream.net>

1 files changed, 3 insertions, 4 deletions

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 866e8d7ca37d..89971e137aab 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -402,7 +402,7 @@ static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
 
         spin_lock_init(&s->s_gen_ttl_lock);
         s->s_cap_gen = 0;
-        s->s_cap_ttl = 0;
+        s->s_cap_ttl = jiffies - 1;
 
         spin_lock_init(&s->s_cap_lock);
         s->s_renew_requested = 0;
@@ -1083,8 +1083,7 @@ static void renewed_caps(struct ceph_mds_client *mdsc,
         int wake = 0;
 
         spin_lock(&session->s_cap_lock);
-        was_stale = is_renew && (session->s_cap_ttl == 0 ||
-                                 time_after_eq(jiffies, session->s_cap_ttl));
+        was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
 
         session->s_cap_ttl = session->s_renew_requested +
                 mdsc->mdsmap->m_session_timeout*HZ;
@@ -2332,7 +2331,7 @@ static void handle_session(struct ceph_mds_session *session,
                         session->s_mds);
                 spin_lock(&session->s_gen_ttl_lock);
                 session->s_cap_gen++;
-                session->s_cap_ttl = 0;
+                session->s_cap_ttl = jiffies - 1;
                 spin_unlock(&session->s_gen_ttl_lock);
                 send_renew_caps(mdsc, session);
                 break;