NFSv4: Clean up NFS4ERR_CB_PATH_DOWN error management...

Add a delegation cleanup phase to the state management loop, and do the
NFS4ERR_CB_PATH_DOWN recovery there.
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/delegation.c

@@ -258,7 +258,7 @@ static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegat
 /*
  * Return all delegations that have been marked for return
  */
-static void nfs_client_return_marked_delegations(struct nfs_client *clp)
+void nfs_client_return_marked_delegations(struct nfs_client *clp)
 {
 	struct nfs_delegation *delegation;
 	struct inode *inode;
@@ -342,15 +342,16 @@ void nfs_super_return_all_delegations(struct super_block *sb)
 	nfs_client_return_marked_delegations(clp);
 }
 
-static void nfs_client_return_all_delegations(struct nfs_client *clp)
+static void nfs_client_mark_return_all_delegations(struct nfs_client *clp)
 {
 	struct nfs_delegation *delegation;
 
 	rcu_read_lock();
-	list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list)
+	list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
 		set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
+		set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
+	}
 	rcu_read_unlock();
-	nfs_client_return_marked_delegations(clp);
 }
 
 static int nfs_do_expire_all_delegations(void *ptr)
@@ -363,7 +364,8 @@ static int nfs_do_expire_all_delegations(void *ptr)
 		goto out;
 	if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0)
 		goto out;
-	nfs_client_return_all_delegations(clp);
+	nfs_client_mark_return_all_delegations(clp);
+	nfs_client_return_marked_delegations(clp);
 out:
 	nfs_put_client(clp);
 	module_put_and_exit(0);
@@ -392,7 +394,7 @@ void nfs_handle_cb_pathdown(struct nfs_client *clp)
 {
 	if (clp == NULL)
 		return;
-	nfs_client_return_all_delegations(clp);
+	nfs_client_mark_return_all_delegations(clp);
 }
 
 struct recall_threadargs {

fs/nfs/delegation.h

@@ -40,6 +40,7 @@ struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs
 void nfs_super_return_all_delegations(struct super_block *sb);
 void nfs_expire_all_delegations(struct nfs_client *clp);
 void nfs_handle_cb_pathdown(struct nfs_client *clp);
+void nfs_client_return_marked_delegations(struct nfs_client *clp);
 
 void nfs_delegation_mark_reclaim(struct nfs_client *clp);
 void nfs_delegation_reap_unclaimed(struct nfs_client *clp);

fs/nfs/nfs4_fs.h

@@ -43,7 +43,7 @@ enum nfs4_client_state {
 	NFS4CLNT_LEASE_EXPIRED,
 	NFS4CLNT_RECLAIM_REBOOT,
 	NFS4CLNT_RECLAIM_NOGRACE,
-	NFS4CLNT_CB_PATH_DOWN,
+	NFS4CLNT_DELEGRETURN,
 };
 
 /*

fs/nfs/nfs4state.c

@@ -1027,7 +1027,7 @@ static void nfs4_recovery_handle_error(struct nfs_client *clp, int error)
 {
 	switch (error) {
 		case -NFS4ERR_CB_PATH_DOWN:
-			set_bit(NFS4CLNT_CB_PATH_DOWN, &clp->cl_state);
+			nfs_handle_cb_pathdown(clp);
 			break;
 		case -NFS4ERR_STALE_CLIENTID:
 		case -NFS4ERR_LEASE_MOVED:
@@ -1156,11 +1156,14 @@ static int reclaimer(void *ptr)
 				nfs4_state_end_reclaim_nograce(clp);
 			continue;
 		}
+
+		if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
+			nfs_client_return_marked_delegations(clp);
+			continue;
+		}
 		break;
 	}
 out:
-	if (test_and_clear_bit(NFS4CLNT_CB_PATH_DOWN, &clp->cl_state))
-		nfs_handle_cb_pathdown(clp);
 	nfs4_clear_recover_bit(clp);
 	nfs_put_client(clp);
 	module_put_and_exit(0);