Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 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 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 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 | |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 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 | * |
Tiger Yang | 5000863 | 2007-03-20 16:01:38 -0700 | [diff] [blame] | 41 | * New in version 8: |
| 42 | * - Replace delete inode votes with a cluster lock |
| 43 | * |
Srinivas Eeda | 1faf289 | 2007-01-29 15:31:35 -0800 | [diff] [blame] | 44 | * New in version 7: |
| 45 | * - DLM join domain includes the live nodemap |
| 46 | * |
Kurt Hackel | ba2bf21 | 2006-12-01 14:47:20 -0800 | [diff] [blame] | 47 | * New in version 6: |
| 48 | * - DLM lockres remote refcount fixes. |
| 49 | * |
Andrew Beekhof | 828ae6a | 2006-12-04 14:04:55 +0100 | [diff] [blame] | 50 | * New in version 5: |
| 51 | * - Network timeout checking protocol |
| 52 | * |
Mark Fasheh | 24c19ef | 2006-09-22 17:28:19 -0700 | [diff] [blame] | 53 | * New in version 4: |
| 54 | * - Remove i_generation from lock names for better stat performance. |
| 55 | * |
Mark Fasheh | 379dfe9 | 2006-09-08 14:21:03 -0700 | [diff] [blame] | 56 | * New in version 3: |
| 57 | * - Replace dentry votes with a cluster lock |
| 58 | * |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 59 | * New in version 2: |
| 60 | * - full 64 bit i_size in the metadata lock lvbs |
| 61 | * - introduction of "rw" lock and pushing meta/data locking down |
| 62 | */ |
Tiger Yang | 5000863 | 2007-03-20 16:01:38 -0700 | [diff] [blame] | 63 | #define O2NET_PROTOCOL_VERSION 8ULL |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 64 | struct o2net_handshake { |
| 65 | __be64 protocol_version; |
| 66 | __be64 connector_id; |
Andrew Beekhof | 828ae6a | 2006-12-04 14:04:55 +0100 | [diff] [blame] | 67 | __be32 o2hb_heartbeat_timeout_ms; |
| 68 | __be32 o2net_idle_timeout_ms; |
| 69 | __be32 o2net_keepalive_delay_ms; |
| 70 | __be32 o2net_reconnect_delay_ms; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 71 | }; |
| 72 | |
| 73 | struct o2net_node { |
| 74 | /* this is never called from int/bh */ |
| 75 | spinlock_t nn_lock; |
| 76 | |
| 77 | /* set the moment an sc is allocated and a connect is started */ |
| 78 | struct o2net_sock_container *nn_sc; |
| 79 | /* _valid is only set after the handshake passes and tx can happen */ |
| 80 | unsigned nn_sc_valid:1; |
| 81 | /* if this is set tx just returns it */ |
| 82 | int nn_persistent_error; |
| 83 | |
| 84 | /* threads waiting for an sc to arrive wait on the wq for generation |
| 85 | * to increase. it is increased when a connecting socket succeeds |
| 86 | * or fails or when an accepted socket is attached. */ |
| 87 | wait_queue_head_t nn_sc_wq; |
| 88 | |
| 89 | struct idr nn_status_idr; |
| 90 | struct list_head nn_status_list; |
| 91 | |
| 92 | /* connects are attempted from when heartbeat comes up until either hb |
| 93 | * goes down, the node is unconfigured, no connect attempts succeed |
| 94 | * before O2NET_CONN_IDLE_DELAY, or a connect succeeds. connect_work |
| 95 | * is queued from set_nn_state both from hb up and from itself if a |
| 96 | * connect attempt fails and so can be self-arming. shutdown is |
| 97 | * careful to first mark the nn such that no connects will be attempted |
| 98 | * before canceling delayed connect work and flushing the queue. */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 99 | struct delayed_work nn_connect_work; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 100 | unsigned long nn_last_connect_attempt; |
| 101 | |
| 102 | /* this is queued as nodes come up and is canceled when a connection is |
| 103 | * established. this expiring gives up on the node and errors out |
| 104 | * transmits */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 105 | struct delayed_work nn_connect_expired; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 106 | |
| 107 | /* after we give up on a socket we wait a while before deciding |
| 108 | * that it is still heartbeating and that we should do some |
| 109 | * quorum work */ |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 110 | struct delayed_work nn_still_up; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 111 | }; |
| 112 | |
| 113 | struct o2net_sock_container { |
| 114 | struct kref sc_kref; |
| 115 | /* the next two are vaild for the life time of the sc */ |
| 116 | struct socket *sc_sock; |
| 117 | struct o2nm_node *sc_node; |
| 118 | |
| 119 | /* all of these sc work structs hold refs on the sc while they are |
| 120 | * queued. they should not be able to ref a freed sc. the teardown |
| 121 | * race is with o2net_wq destruction in o2net_stop_listening() */ |
| 122 | |
| 123 | /* rx and connect work are generated from socket callbacks. sc |
| 124 | * shutdown removes the callbacks and then flushes the work queue */ |
| 125 | struct work_struct sc_rx_work; |
| 126 | struct work_struct sc_connect_work; |
| 127 | /* shutdown work is triggered in two ways. the simple way is |
| 128 | * for a code path calls ensure_shutdown which gets a lock, removes |
| 129 | * the sc from the nn, and queues the work. in this case the |
| 130 | * work is single-shot. the work is also queued from a sock |
| 131 | * callback, though, and in this case the work will find the sc |
| 132 | * still on the nn and will call ensure_shutdown itself.. this |
| 133 | * ends up triggering the shutdown work again, though nothing |
| 134 | * will be done in that second iteration. so work queue teardown |
| 135 | * has to be careful to remove the sc from the nn before waiting |
| 136 | * on the work queue so that the shutdown work doesn't remove the |
| 137 | * sc and rearm itself. |
| 138 | */ |
| 139 | struct work_struct sc_shutdown_work; |
| 140 | |
| 141 | struct timer_list sc_idle_timeout; |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 142 | struct delayed_work sc_keepalive_work; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 143 | |
| 144 | unsigned sc_handshake_ok:1; |
| 145 | |
| 146 | struct page *sc_page; |
| 147 | size_t sc_page_off; |
| 148 | |
| 149 | /* original handlers for the sockets */ |
| 150 | void (*sc_state_change)(struct sock *sk); |
| 151 | void (*sc_data_ready)(struct sock *sk, int bytes); |
| 152 | |
| 153 | struct timeval sc_tv_timer; |
| 154 | struct timeval sc_tv_data_ready; |
| 155 | struct timeval sc_tv_advance_start; |
| 156 | struct timeval sc_tv_advance_stop; |
| 157 | struct timeval sc_tv_func_start; |
| 158 | struct timeval sc_tv_func_stop; |
| 159 | u32 sc_msg_key; |
| 160 | u16 sc_msg_type; |
Zhen Wei | 925037b | 2007-01-23 17:19:59 -0800 | [diff] [blame] | 161 | |
| 162 | struct mutex sc_send_lock; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 163 | }; |
| 164 | |
| 165 | struct o2net_msg_handler { |
| 166 | struct rb_node nh_node; |
| 167 | u32 nh_max_len; |
| 168 | u32 nh_msg_type; |
| 169 | u32 nh_key; |
| 170 | o2net_msg_handler_func *nh_func; |
| 171 | o2net_msg_handler_func *nh_func_data; |
Kurt Hackel | d74c980 | 2007-01-17 17:04:25 -0800 | [diff] [blame] | 172 | o2net_post_msg_handler_func |
| 173 | *nh_post_func; |
Zach Brown | 9821148 | 2005-12-15 14:31:23 -0800 | [diff] [blame] | 174 | struct kref nh_kref; |
| 175 | struct list_head nh_unregister_item; |
| 176 | }; |
| 177 | |
| 178 | enum o2net_system_error { |
| 179 | O2NET_ERR_NONE = 0, |
| 180 | O2NET_ERR_NO_HNDLR, |
| 181 | O2NET_ERR_OVERFLOW, |
| 182 | O2NET_ERR_DIED, |
| 183 | O2NET_ERR_MAX |
| 184 | }; |
| 185 | |
| 186 | struct o2net_status_wait { |
| 187 | enum o2net_system_error ns_sys_status; |
| 188 | s32 ns_status; |
| 189 | int ns_id; |
| 190 | wait_queue_head_t ns_wq; |
| 191 | struct list_head ns_node_item; |
| 192 | }; |
| 193 | |
| 194 | #endif /* O2CLUSTER_TCP_INTERNAL_H */ |