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.
41 * With version 11, we separate out the filesystem locking portion. The
42 * filesystem now has a major.minor version it negotiates. Version 11
43 * introduces this negotiation to the o2dlm protocol, and as such the
44 * version here in tcp_internal.h should not need to be bumped for
45 * filesystem locking changes.
48 * - Negotiate hb timeout when storage is down.
51 * - Negotiation of filesystem locking in the dlm join.
54 * - Meta/data locks combined
60 * - Replace delete inode votes with a cluster lock
63 * - DLM join domain includes the live nodemap
66 * - DLM lockres remote refcount fixes.
69 * - Network timeout checking protocol
72 * - Remove i_generation from lock names for better stat performance.
75 * - Replace dentry votes with a cluster lock
78 * - full 64 bit i_size in the metadata lock lvbs
79 * - introduction of "rw" lock and pushing meta/data locking down
81 #define O2NET_PROTOCOL_VERSION 12ULL
82 struct o2net_handshake {
83 __be64 protocol_version;
85 __be32 o2hb_heartbeat_timeout_ms;
86 __be32 o2net_idle_timeout_ms;
87 __be32 o2net_keepalive_delay_ms;
88 __be32 o2net_reconnect_delay_ms;
92 /* this is never called from int/bh */
95 /* set the moment an sc is allocated and a connect is started */
96 struct o2net_sock_container *nn_sc;
97 /* _valid is only set after the handshake passes and tx can happen */
98 unsigned nn_sc_valid:1;
99 /* if this is set tx just returns it */
100 int nn_persistent_error;
101 /* It is only set to 1 after the idle time out. */
104 /* threads waiting for an sc to arrive wait on the wq for generation
105 * to increase. it is increased when a connecting socket succeeds
106 * or fails or when an accepted socket is attached. */
107 wait_queue_head_t nn_sc_wq;
109 struct idr nn_status_idr;
110 struct list_head nn_status_list;
112 /* connects are attempted from when heartbeat comes up until either hb
113 * goes down, the node is unconfigured, or a connect succeeds.
114 * connect_work is queued from set_nn_state both from hb up and from
115 * itself if a connect attempt fails and so can be self-arming.
116 * shutdown is careful to first mark the nn such that no connects will
117 * be attempted before canceling delayed connect work and flushing the
119 struct delayed_work nn_connect_work;
120 unsigned long nn_last_connect_attempt;
122 /* this is queued as nodes come up and is canceled when a connection is
123 * established. this expiring gives up on the node and errors out
125 struct delayed_work nn_connect_expired;
127 /* after we give up on a socket we wait a while before deciding
128 * that it is still heartbeating and that we should do some
130 struct delayed_work nn_still_up;
133 struct o2net_sock_container {
135 /* the next two are valid for the life time of the sc */
136 struct socket *sc_sock;
137 struct o2nm_node *sc_node;
139 /* all of these sc work structs hold refs on the sc while they are
140 * queued. they should not be able to ref a freed sc. the teardown
141 * race is with o2net_wq destruction in o2net_stop_listening() */
143 /* rx and connect work are generated from socket callbacks. sc
144 * shutdown removes the callbacks and then flushes the work queue */
145 struct work_struct sc_rx_work;
146 struct work_struct sc_connect_work;
147 /* shutdown work is triggered in two ways. the simple way is
148 * for a code path calls ensure_shutdown which gets a lock, removes
149 * the sc from the nn, and queues the work. in this case the
150 * work is single-shot. the work is also queued from a sock
151 * callback, though, and in this case the work will find the sc
152 * still on the nn and will call ensure_shutdown itself.. this
153 * ends up triggering the shutdown work again, though nothing
154 * will be done in that second iteration. so work queue teardown
155 * has to be careful to remove the sc from the nn before waiting
156 * on the work queue so that the shutdown work doesn't remove the
157 * sc and rearm itself.
159 struct work_struct sc_shutdown_work;
161 struct timer_list sc_idle_timeout;
162 struct delayed_work sc_keepalive_work;
164 unsigned sc_handshake_ok:1;
166 struct page *sc_page;
169 /* original handlers for the sockets */
170 void (*sc_state_change)(struct sock *sk);
171 void (*sc_data_ready)(struct sock *sk);
176 #ifdef CONFIG_DEBUG_FS
177 struct list_head sc_net_debug_item;
179 ktime_t sc_tv_data_ready;
180 ktime_t sc_tv_advance_start;
181 ktime_t sc_tv_advance_stop;
182 ktime_t sc_tv_func_start;
183 ktime_t sc_tv_func_stop;
185 #ifdef CONFIG_OCFS2_FS_STATS
186 ktime_t sc_tv_acquiry_total;
187 ktime_t sc_tv_send_total;
188 ktime_t sc_tv_status_total;
191 ktime_t sc_tv_process_total;
193 struct mutex sc_send_lock;
196 struct o2net_msg_handler {
197 struct rb_node nh_node;
201 o2net_msg_handler_func *nh_func;
202 o2net_msg_handler_func *nh_func_data;
203 o2net_post_msg_handler_func
206 struct list_head nh_unregister_item;
209 enum o2net_system_error {
217 struct o2net_status_wait {
218 enum o2net_system_error ns_sys_status;
221 wait_queue_head_t ns_wq;
222 struct list_head ns_node_item;
225 #ifdef CONFIG_DEBUG_FS
226 /* just for state dumps */
227 struct o2net_send_tracking {
228 struct list_head st_net_debug_item;
229 struct task_struct *st_task;
230 struct o2net_sock_container *st_sc;
235 ktime_t st_sock_time;
236 ktime_t st_send_time;
237 ktime_t st_status_time;
240 struct o2net_send_tracking {
243 #endif /* CONFIG_DEBUG_FS */
245 #endif /* O2CLUSTER_TCP_INTERNAL_H */