1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
4 * Copyright (C) 2005 Oracle. All rights reserved.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public
17 * License along with this program; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 021110-1307, USA.
22 #ifndef O2CLUSTER_TCP_INTERNAL_H
23 #define O2CLUSTER_TCP_INTERNAL_H
25 #define O2NET_MSG_MAGIC ((u16)0xfa55)
26 #define O2NET_MSG_STATUS_MAGIC ((u16)0xfa56)
27 #define O2NET_MSG_KEEP_REQ_MAGIC ((u16)0xfa57)
28 #define O2NET_MSG_KEEP_RESP_MAGIC ((u16)0xfa58)
30 /* same as hb delay, we're waiting for another node to recognize our hb */
31 #define O2NET_RECONNECT_DELAY_MS O2HB_REGION_TIMEOUT_MS
33 /* we're delaying our quorum decision so that heartbeat will have timed
34 * out truly dead nodes by the time we come around to making decisions
36 #define O2NET_QUORUM_DELAY_MS ((o2hb_dead_threshold + 2) * O2HB_REGION_TIMEOUT_MS)
38 #define O2NET_KEEPALIVE_DELAY_SECS 5
39 #define O2NET_IDLE_TIMEOUT_SECS 10
42 * This version number represents quite a lot, unfortunately. It not
43 * only represents the raw network message protocol on the wire but also
44 * locking semantics of the file system using the protocol. It should
45 * be somewhere else, I'm sure, but right now it isn't.
48 * - Replace dentry votes with a cluster lock
51 * - full 64 bit i_size in the metadata lock lvbs
52 * - introduction of "rw" lock and pushing meta/data locking down
54 #define O2NET_PROTOCOL_VERSION 3ULL
55 struct o2net_handshake {
56 __be64 protocol_version;
61 /* this is never called from int/bh */
64 /* set the moment an sc is allocated and a connect is started */
65 struct o2net_sock_container *nn_sc;
66 /* _valid is only set after the handshake passes and tx can happen */
67 unsigned nn_sc_valid:1;
68 /* if this is set tx just returns it */
69 int nn_persistent_error;
71 /* threads waiting for an sc to arrive wait on the wq for generation
72 * to increase. it is increased when a connecting socket succeeds
73 * or fails or when an accepted socket is attached. */
74 wait_queue_head_t nn_sc_wq;
76 struct idr nn_status_idr;
77 struct list_head nn_status_list;
79 /* connects are attempted from when heartbeat comes up until either hb
80 * goes down, the node is unconfigured, no connect attempts succeed
81 * before O2NET_CONN_IDLE_DELAY, or a connect succeeds. connect_work
82 * is queued from set_nn_state both from hb up and from itself if a
83 * connect attempt fails and so can be self-arming. shutdown is
84 * careful to first mark the nn such that no connects will be attempted
85 * before canceling delayed connect work and flushing the queue. */
86 struct work_struct nn_connect_work;
87 unsigned long nn_last_connect_attempt;
89 /* this is queued as nodes come up and is canceled when a connection is
90 * established. this expiring gives up on the node and errors out
92 struct work_struct nn_connect_expired;
94 /* after we give up on a socket we wait a while before deciding
95 * that it is still heartbeating and that we should do some
97 struct work_struct nn_still_up;
100 struct o2net_sock_container {
102 /* the next two are vaild for the life time of the sc */
103 struct socket *sc_sock;
104 struct o2nm_node *sc_node;
106 /* all of these sc work structs hold refs on the sc while they are
107 * queued. they should not be able to ref a freed sc. the teardown
108 * race is with o2net_wq destruction in o2net_stop_listening() */
110 /* rx and connect work are generated from socket callbacks. sc
111 * shutdown removes the callbacks and then flushes the work queue */
112 struct work_struct sc_rx_work;
113 struct work_struct sc_connect_work;
114 /* shutdown work is triggered in two ways. the simple way is
115 * for a code path calls ensure_shutdown which gets a lock, removes
116 * the sc from the nn, and queues the work. in this case the
117 * work is single-shot. the work is also queued from a sock
118 * callback, though, and in this case the work will find the sc
119 * still on the nn and will call ensure_shutdown itself.. this
120 * ends up triggering the shutdown work again, though nothing
121 * will be done in that second iteration. so work queue teardown
122 * has to be careful to remove the sc from the nn before waiting
123 * on the work queue so that the shutdown work doesn't remove the
124 * sc and rearm itself.
126 struct work_struct sc_shutdown_work;
128 struct timer_list sc_idle_timeout;
129 struct work_struct sc_keepalive_work;
131 unsigned sc_handshake_ok:1;
133 struct page *sc_page;
136 /* original handlers for the sockets */
137 void (*sc_state_change)(struct sock *sk);
138 void (*sc_data_ready)(struct sock *sk, int bytes);
140 struct timeval sc_tv_timer;
141 struct timeval sc_tv_data_ready;
142 struct timeval sc_tv_advance_start;
143 struct timeval sc_tv_advance_stop;
144 struct timeval sc_tv_func_start;
145 struct timeval sc_tv_func_stop;
150 struct o2net_msg_handler {
151 struct rb_node nh_node;
155 o2net_msg_handler_func *nh_func;
156 o2net_msg_handler_func *nh_func_data;
158 struct list_head nh_unregister_item;
161 enum o2net_system_error {
169 struct o2net_status_wait {
170 enum o2net_system_error ns_sys_status;
173 wait_queue_head_t ns_wq;
174 struct list_head ns_node_item;
177 #endif /* O2CLUSTER_TCP_INTERNAL_H */