ceph: remove recon_gen logic

We don't get an explicit affirmative confirmation that our caps reconnect,
nor do we necessarily want to pay that cost.  So, take all this code out
for now.
Signed-off-by: Sage Weil <sage@newdream.net>

fs/ceph/caps.c

@@ -610,7 +610,6 @@ retry:
 	cap->issue_seq = seq;
 	cap->mseq = mseq;
 	cap->cap_gen = session->s_cap_gen;
-	cap->recon_gen = session->s_recon_gen;
 
 	if (fmode >= 0)
 		__ceph_get_fmode(ci, fmode);
@@ -627,21 +626,13 @@ retry:
 static int __cap_is_valid(struct ceph_cap *cap)
 {
 	unsigned long ttl;
-	u32 gen, recon_gen;
+	u32 gen;
 
 	spin_lock(&cap->session->s_cap_lock);
 	gen = cap->session->s_cap_gen;
-	recon_gen = cap->session->s_recon_gen;
 	ttl = cap->session->s_cap_ttl;
 	spin_unlock(&cap->session->s_cap_lock);
 
-	if (cap->recon_gen != recon_gen) {
-		dout("__cap_is_valid %p cap %p issued %s "
-		     "but DEAD (recon_gen %u vs %u)\n", &cap->ci->vfs_inode,
-		     cap, ceph_cap_string(cap->issued), cap->recon_gen,
-		     recon_gen);
-		return 0;
-	}
 	if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) {
 		dout("__cap_is_valid %p cap %p issued %s "
 		     "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode,
@@ -2213,7 +2204,6 @@ restart:
 	issued |= implemented | __ceph_caps_dirty(ci);
 
 	cap->cap_gen = session->s_cap_gen;
-	cap->recon_gen = session->s_recon_gen;
 
 	__check_cap_issue(ci, cap, newcaps);
 

fs/ceph/mds_client.c

@@ -329,7 +329,6 @@ static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
 	ceph_con_open(&s->s_con, ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
 
 	spin_lock_init(&s->s_cap_lock);
-	s->s_recon_gen = 0;
 	s->s_cap_gen = 0;
 	s->s_cap_ttl = 0;
 	s->s_renew_requested = 0;
@@ -736,25 +735,14 @@ static void remove_session_caps(struct ceph_mds_session *session)
 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
 			      void *arg)
 {
-	struct ceph_mds_session *session = arg;
-
-	spin_lock(&inode->i_lock);
-	if (cap->recon_gen != session->s_recon_gen) {
-		pr_err("failed reconnect %p %llx.%llx cap %p "
-		       "(recon_gen %d < session %d)\n", inode,
-		       ceph_vinop(inode), cap,
-		       cap->recon_gen, session->s_recon_gen);
-		__ceph_remove_cap(cap, NULL);
-	}
 	wake_up(&ceph_inode(inode)->i_cap_wq);
-	spin_unlock(&inode->i_lock);
 	return 0;
 }
 
 static void wake_up_session_caps(struct ceph_mds_session *session)
 {
 	dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
-	iterate_session_caps(session, wake_up_session_cb, session);
+	iterate_session_caps(session, wake_up_session_cb, NULL);
 }
 
 /*
@@ -2052,7 +2040,6 @@ static void send_mds_reconnect(struct ceph_mds_client *mdsc, int mds)
 
 		session->s_state = CEPH_MDS_SESSION_RECONNECTING;
 		session->s_seq = 0;
-		session->s_recon_gen++;
 
 		ceph_con_open(&session->s_con,
 			      ceph_mdsmap_get_addr(mdsc->mdsmap, mds));

fs/ceph/mds_client.h

@@ -98,8 +98,6 @@ 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 */

fs/ceph/super.h

@@ -171,7 +171,6 @@ struct ceph_cap {
 	int mds_wanted;
 	u32 seq, issue_seq, mseq;
 	u32 cap_gen;      /* active/stale cycle */
-	u32 recon_gen;    /* mds restart reconnect cycle */
 	unsigned long last_used;
 	struct list_head caps_item;
 };