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1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * Copyright (C) 2005 Oracle. All rights reserved. | |
5 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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. | |
20 | */ | |
21 | ||
22 | #ifndef O2CLUSTER_TCP_INTERNAL_H | |
23 | #define O2CLUSTER_TCP_INTERNAL_H | |
24 | ||
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) | |
29 | ||
98211489 ZB |
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 | |
32 | * on their number */ | |
33 | #define O2NET_QUORUM_DELAY_MS ((o2hb_dead_threshold + 2) * O2HB_REGION_TIMEOUT_MS) | |
34 | ||
98211489 ZB |
35 | /* |
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. | |
40 | * | |
d24fbcda JB |
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. | |
46 | * | |
47 | * New in version 11 | |
48 | * - Negotiation of filesystem locking in the dlm join. | |
49 | * | |
c934a92d MF |
50 | * New in version 10: |
51 | * - Meta/data locks combined | |
52 | * | |
34d024f8 MF |
53 | * New in version 9: |
54 | * - All votes removed | |
55 | * | |
50008630 TY |
56 | * New in version 8: |
57 | * - Replace delete inode votes with a cluster lock | |
58 | * | |
1faf2894 SE |
59 | * New in version 7: |
60 | * - DLM join domain includes the live nodemap | |
61 | * | |
ba2bf218 KH |
62 | * New in version 6: |
63 | * - DLM lockres remote refcount fixes. | |
64 | * | |
828ae6af AB |
65 | * New in version 5: |
66 | * - Network timeout checking protocol | |
67 | * | |
24c19ef4 MF |
68 | * New in version 4: |
69 | * - Remove i_generation from lock names for better stat performance. | |
70 | * | |
379dfe9d MF |
71 | * New in version 3: |
72 | * - Replace dentry votes with a cluster lock | |
73 | * | |
98211489 ZB |
74 | * New in version 2: |
75 | * - full 64 bit i_size in the metadata lock lvbs | |
76 | * - introduction of "rw" lock and pushing meta/data locking down | |
77 | */ | |
d24fbcda | 78 | #define O2NET_PROTOCOL_VERSION 11ULL |
98211489 ZB |
79 | struct o2net_handshake { |
80 | __be64 protocol_version; | |
81 | __be64 connector_id; | |
828ae6af AB |
82 | __be32 o2hb_heartbeat_timeout_ms; |
83 | __be32 o2net_idle_timeout_ms; | |
84 | __be32 o2net_keepalive_delay_ms; | |
85 | __be32 o2net_reconnect_delay_ms; | |
98211489 ZB |
86 | }; |
87 | ||
88 | struct o2net_node { | |
89 | /* this is never called from int/bh */ | |
90 | spinlock_t nn_lock; | |
91 | ||
92 | /* set the moment an sc is allocated and a connect is started */ | |
93 | struct o2net_sock_container *nn_sc; | |
94 | /* _valid is only set after the handshake passes and tx can happen */ | |
95 | unsigned nn_sc_valid:1; | |
96 | /* if this is set tx just returns it */ | |
97 | int nn_persistent_error; | |
98 | ||
99 | /* threads waiting for an sc to arrive wait on the wq for generation | |
100 | * to increase. it is increased when a connecting socket succeeds | |
101 | * or fails or when an accepted socket is attached. */ | |
102 | wait_queue_head_t nn_sc_wq; | |
103 | ||
104 | struct idr nn_status_idr; | |
105 | struct list_head nn_status_list; | |
106 | ||
107 | /* connects are attempted from when heartbeat comes up until either hb | |
108 | * goes down, the node is unconfigured, no connect attempts succeed | |
109 | * before O2NET_CONN_IDLE_DELAY, or a connect succeeds. connect_work | |
110 | * is queued from set_nn_state both from hb up and from itself if a | |
111 | * connect attempt fails and so can be self-arming. shutdown is | |
112 | * careful to first mark the nn such that no connects will be attempted | |
113 | * before canceling delayed connect work and flushing the queue. */ | |
c4028958 | 114 | struct delayed_work nn_connect_work; |
98211489 ZB |
115 | unsigned long nn_last_connect_attempt; |
116 | ||
117 | /* this is queued as nodes come up and is canceled when a connection is | |
118 | * established. this expiring gives up on the node and errors out | |
119 | * transmits */ | |
c4028958 | 120 | struct delayed_work nn_connect_expired; |
98211489 ZB |
121 | |
122 | /* after we give up on a socket we wait a while before deciding | |
123 | * that it is still heartbeating and that we should do some | |
124 | * quorum work */ | |
c4028958 | 125 | struct delayed_work nn_still_up; |
98211489 ZB |
126 | }; |
127 | ||
128 | struct o2net_sock_container { | |
129 | struct kref sc_kref; | |
130 | /* the next two are vaild for the life time of the sc */ | |
131 | struct socket *sc_sock; | |
132 | struct o2nm_node *sc_node; | |
133 | ||
134 | /* all of these sc work structs hold refs on the sc while they are | |
135 | * queued. they should not be able to ref a freed sc. the teardown | |
136 | * race is with o2net_wq destruction in o2net_stop_listening() */ | |
137 | ||
138 | /* rx and connect work are generated from socket callbacks. sc | |
139 | * shutdown removes the callbacks and then flushes the work queue */ | |
140 | struct work_struct sc_rx_work; | |
141 | struct work_struct sc_connect_work; | |
142 | /* shutdown work is triggered in two ways. the simple way is | |
143 | * for a code path calls ensure_shutdown which gets a lock, removes | |
144 | * the sc from the nn, and queues the work. in this case the | |
145 | * work is single-shot. the work is also queued from a sock | |
146 | * callback, though, and in this case the work will find the sc | |
147 | * still on the nn and will call ensure_shutdown itself.. this | |
148 | * ends up triggering the shutdown work again, though nothing | |
149 | * will be done in that second iteration. so work queue teardown | |
150 | * has to be careful to remove the sc from the nn before waiting | |
151 | * on the work queue so that the shutdown work doesn't remove the | |
152 | * sc and rearm itself. | |
153 | */ | |
154 | struct work_struct sc_shutdown_work; | |
155 | ||
156 | struct timer_list sc_idle_timeout; | |
c4028958 | 157 | struct delayed_work sc_keepalive_work; |
98211489 ZB |
158 | |
159 | unsigned sc_handshake_ok:1; | |
160 | ||
161 | struct page *sc_page; | |
162 | size_t sc_page_off; | |
163 | ||
164 | /* original handlers for the sockets */ | |
165 | void (*sc_state_change)(struct sock *sk); | |
166 | void (*sc_data_ready)(struct sock *sk, int bytes); | |
167 | ||
168 | struct timeval sc_tv_timer; | |
169 | struct timeval sc_tv_data_ready; | |
170 | struct timeval sc_tv_advance_start; | |
171 | struct timeval sc_tv_advance_stop; | |
172 | struct timeval sc_tv_func_start; | |
173 | struct timeval sc_tv_func_stop; | |
174 | u32 sc_msg_key; | |
175 | u16 sc_msg_type; | |
925037bc ZW |
176 | |
177 | struct mutex sc_send_lock; | |
98211489 ZB |
178 | }; |
179 | ||
180 | struct o2net_msg_handler { | |
181 | struct rb_node nh_node; | |
182 | u32 nh_max_len; | |
183 | u32 nh_msg_type; | |
184 | u32 nh_key; | |
185 | o2net_msg_handler_func *nh_func; | |
186 | o2net_msg_handler_func *nh_func_data; | |
d74c9803 KH |
187 | o2net_post_msg_handler_func |
188 | *nh_post_func; | |
98211489 ZB |
189 | struct kref nh_kref; |
190 | struct list_head nh_unregister_item; | |
191 | }; | |
192 | ||
193 | enum o2net_system_error { | |
194 | O2NET_ERR_NONE = 0, | |
195 | O2NET_ERR_NO_HNDLR, | |
196 | O2NET_ERR_OVERFLOW, | |
197 | O2NET_ERR_DIED, | |
198 | O2NET_ERR_MAX | |
199 | }; | |
200 | ||
201 | struct o2net_status_wait { | |
202 | enum o2net_system_error ns_sys_status; | |
203 | s32 ns_status; | |
204 | int ns_id; | |
205 | wait_queue_head_t ns_wq; | |
206 | struct list_head ns_node_item; | |
207 | }; | |
208 | ||
209 | #endif /* O2CLUSTER_TCP_INTERNAL_H */ |