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 /* we're delaying our quorum decision so that heartbeat will have timed
31 * out truly dead nodes by the time we come around to making decisions
33 #define O2NET_QUORUM_DELAY_MS ((o2hb_dead_threshold + 2) * O2HB_REGION_TIMEOUT_MS)
36 * This version number represents quite a lot, unfortunately. It not
37 * only represents the raw network message protocol on the wire but also
38 * locking semantics of the file system using the protocol. It should
39 * be somewhere else, I'm sure, but right now it isn't.
45 * - Replace delete inode votes with a cluster lock
48 * - DLM join domain includes the live nodemap
51 * - DLM lockres remote refcount fixes.
54 * - Network timeout checking protocol
57 * - Remove i_generation from lock names for better stat performance.
60 * - Replace dentry votes with a cluster lock
63 * - full 64 bit i_size in the metadata lock lvbs
64 * - introduction of "rw" lock and pushing meta/data locking down
66 #define O2NET_PROTOCOL_VERSION 9ULL
67 struct o2net_handshake {
68 __be64 protocol_version;
70 __be32 o2hb_heartbeat_timeout_ms;
71 __be32 o2net_idle_timeout_ms;
72 __be32 o2net_keepalive_delay_ms;
73 __be32 o2net_reconnect_delay_ms;
77 /* this is never called from int/bh */
80 /* set the moment an sc is allocated and a connect is started */
81 struct o2net_sock_container *nn_sc;
82 /* _valid is only set after the handshake passes and tx can happen */
83 unsigned nn_sc_valid:1;
84 /* if this is set tx just returns it */
85 int nn_persistent_error;
87 /* threads waiting for an sc to arrive wait on the wq for generation
88 * to increase. it is increased when a connecting socket succeeds
89 * or fails or when an accepted socket is attached. */
90 wait_queue_head_t nn_sc_wq;
92 struct idr nn_status_idr;
93 struct list_head nn_status_list;
95 /* connects are attempted from when heartbeat comes up until either hb
96 * goes down, the node is unconfigured, no connect attempts succeed
97 * before O2NET_CONN_IDLE_DELAY, or a connect succeeds. connect_work
98 * is queued from set_nn_state both from hb up and from itself if a
99 * connect attempt fails and so can be self-arming. shutdown is
100 * careful to first mark the nn such that no connects will be attempted
101 * before canceling delayed connect work and flushing the queue. */
102 struct delayed_work nn_connect_work;
103 unsigned long nn_last_connect_attempt;
105 /* this is queued as nodes come up and is canceled when a connection is
106 * established. this expiring gives up on the node and errors out
108 struct delayed_work nn_connect_expired;
110 /* after we give up on a socket we wait a while before deciding
111 * that it is still heartbeating and that we should do some
113 struct delayed_work nn_still_up;
116 struct o2net_sock_container {
118 /* the next two are vaild for the life time of the sc */
119 struct socket *sc_sock;
120 struct o2nm_node *sc_node;
122 /* all of these sc work structs hold refs on the sc while they are
123 * queued. they should not be able to ref a freed sc. the teardown
124 * race is with o2net_wq destruction in o2net_stop_listening() */
126 /* rx and connect work are generated from socket callbacks. sc
127 * shutdown removes the callbacks and then flushes the work queue */
128 struct work_struct sc_rx_work;
129 struct work_struct sc_connect_work;
130 /* shutdown work is triggered in two ways. the simple way is
131 * for a code path calls ensure_shutdown which gets a lock, removes
132 * the sc from the nn, and queues the work. in this case the
133 * work is single-shot. the work is also queued from a sock
134 * callback, though, and in this case the work will find the sc
135 * still on the nn and will call ensure_shutdown itself.. this
136 * ends up triggering the shutdown work again, though nothing
137 * will be done in that second iteration. so work queue teardown
138 * has to be careful to remove the sc from the nn before waiting
139 * on the work queue so that the shutdown work doesn't remove the
140 * sc and rearm itself.
142 struct work_struct sc_shutdown_work;
144 struct timer_list sc_idle_timeout;
145 struct delayed_work sc_keepalive_work;
147 unsigned sc_handshake_ok:1;
149 struct page *sc_page;
152 /* original handlers for the sockets */
153 void (*sc_state_change)(struct sock *sk);
154 void (*sc_data_ready)(struct sock *sk, int bytes);
156 struct timeval sc_tv_timer;
157 struct timeval sc_tv_data_ready;
158 struct timeval sc_tv_advance_start;
159 struct timeval sc_tv_advance_stop;
160 struct timeval sc_tv_func_start;
161 struct timeval sc_tv_func_stop;
165 struct mutex sc_send_lock;
168 struct o2net_msg_handler {
169 struct rb_node nh_node;
173 o2net_msg_handler_func *nh_func;
174 o2net_msg_handler_func *nh_func_data;
175 o2net_post_msg_handler_func
178 struct list_head nh_unregister_item;
181 enum o2net_system_error {
189 struct o2net_status_wait {
190 enum o2net_system_error ns_sys_status;
193 wait_queue_head_t ns_wq;
194 struct list_head ns_node_item;
197 #endif /* O2CLUSTER_TCP_INTERNAL_H */