From cdac830313fa6bf2831693af80fefe4aaac11b7d Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@newdream.net>
Date: Tue, 10 Nov 2009 16:02:23 -0800
Subject: 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>

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 775e6f6..d8132b6 100644
--- a/fs/ceph/caps.c
+++ b/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);
 
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 828417a..aad10d9 100644
--- a/fs/ceph/mds_client.c
+++ b/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));
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index c0846b1..f566e9c 100644
--- a/fs/ceph/mds_client.h
+++ b/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 */
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 2579355..06b62c02 100644
--- a/fs/ceph/super.h
+++ b/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;
 };
-- 
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