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 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 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 * 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 * 50 * New in version 10: 51 * - Meta/data locks combined 52 * 53 * New in version 9: 54 * - All votes removed 55 * 56 * New in version 8: 57 * - Replace delete inode votes with a cluster lock 58 * 59 * New in version 7: 60 * - DLM join domain includes the live nodemap 61 * 62 * New in version 6: 63 * - DLM lockres remote refcount fixes. 64 * 65 * New in version 5: 66 * - Network timeout checking protocol 67 * 68 * New in version 4: 69 * - Remove i_generation from lock names for better stat performance. 70 * 71 * New in version 3: 72 * - Replace dentry votes with a cluster lock 73 * 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 */ 78 #define O2NET_PROTOCOL_VERSION 11ULL 79 struct o2net_handshake { 80 __be64 protocol_version; 81 __be64 connector_id; 82 __be32 o2hb_heartbeat_timeout_ms; 83 __be32 o2net_idle_timeout_ms; 84 __be32 o2net_keepalive_delay_ms; 85 __be32 o2net_reconnect_delay_ms; 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 /* It is only set to 1 after the idle time out. */ 99 atomic_t nn_timeout; 100 101 /* threads waiting for an sc to arrive wait on the wq for generation 102 * to increase. it is increased when a connecting socket succeeds 103 * or fails or when an accepted socket is attached. */ 104 wait_queue_head_t nn_sc_wq; 105 106 struct idr nn_status_idr; 107 struct list_head nn_status_list; 108 109 /* connects are attempted from when heartbeat comes up until either hb 110 * goes down, the node is unconfigured, no connect attempts succeed 111 * before O2NET_CONN_IDLE_DELAY, or a connect succeeds. connect_work 112 * is queued from set_nn_state both from hb up and from itself if a 113 * connect attempt fails and so can be self-arming. shutdown is 114 * careful to first mark the nn such that no connects will be attempted 115 * before canceling delayed connect work and flushing the queue. */ 116 struct delayed_work nn_connect_work; 117 unsigned long nn_last_connect_attempt; 118 119 /* this is queued as nodes come up and is canceled when a connection is 120 * established. this expiring gives up on the node and errors out 121 * transmits */ 122 struct delayed_work nn_connect_expired; 123 124 /* after we give up on a socket we wait a while before deciding 125 * that it is still heartbeating and that we should do some 126 * quorum work */ 127 struct delayed_work nn_still_up; 128 }; 129 130 struct o2net_sock_container { 131 struct kref sc_kref; 132 /* the next two are valid for the life time of the sc */ 133 struct socket *sc_sock; 134 struct o2nm_node *sc_node; 135 136 /* all of these sc work structs hold refs on the sc while they are 137 * queued. they should not be able to ref a freed sc. the teardown 138 * race is with o2net_wq destruction in o2net_stop_listening() */ 139 140 /* rx and connect work are generated from socket callbacks. sc 141 * shutdown removes the callbacks and then flushes the work queue */ 142 struct work_struct sc_rx_work; 143 struct work_struct sc_connect_work; 144 /* shutdown work is triggered in two ways. the simple way is 145 * for a code path calls ensure_shutdown which gets a lock, removes 146 * the sc from the nn, and queues the work. in this case the 147 * work is single-shot. the work is also queued from a sock 148 * callback, though, and in this case the work will find the sc 149 * still on the nn and will call ensure_shutdown itself.. this 150 * ends up triggering the shutdown work again, though nothing 151 * will be done in that second iteration. so work queue teardown 152 * has to be careful to remove the sc from the nn before waiting 153 * on the work queue so that the shutdown work doesn't remove the 154 * sc and rearm itself. 155 */ 156 struct work_struct sc_shutdown_work; 157 158 struct timer_list sc_idle_timeout; 159 struct delayed_work sc_keepalive_work; 160 161 unsigned sc_handshake_ok:1; 162 163 struct page *sc_page; 164 size_t sc_page_off; 165 166 /* original handlers for the sockets */ 167 void (*sc_state_change)(struct sock *sk); 168 void (*sc_data_ready)(struct sock *sk, int bytes); 169 #ifdef CONFIG_DEBUG_FS 170 struct list_head sc_net_debug_item; 171 #endif 172 struct timeval sc_tv_timer; 173 struct timeval sc_tv_data_ready; 174 struct timeval sc_tv_advance_start; 175 struct timeval sc_tv_advance_stop; 176 struct timeval sc_tv_func_start; 177 struct timeval sc_tv_func_stop; 178 u32 sc_msg_key; 179 u16 sc_msg_type; 180 181 struct mutex sc_send_lock; 182 }; 183 184 struct o2net_msg_handler { 185 struct rb_node nh_node; 186 u32 nh_max_len; 187 u32 nh_msg_type; 188 u32 nh_key; 189 o2net_msg_handler_func *nh_func; 190 o2net_msg_handler_func *nh_func_data; 191 o2net_post_msg_handler_func 192 *nh_post_func; 193 struct kref nh_kref; 194 struct list_head nh_unregister_item; 195 }; 196 197 enum o2net_system_error { 198 O2NET_ERR_NONE = 0, 199 O2NET_ERR_NO_HNDLR, 200 O2NET_ERR_OVERFLOW, 201 O2NET_ERR_DIED, 202 O2NET_ERR_MAX 203 }; 204 205 struct o2net_status_wait { 206 enum o2net_system_error ns_sys_status; 207 s32 ns_status; 208 int ns_id; 209 wait_queue_head_t ns_wq; 210 struct list_head ns_node_item; 211 }; 212 213 #ifdef CONFIG_DEBUG_FS 214 /* just for state dumps */ 215 struct o2net_send_tracking { 216 struct list_head st_net_debug_item; 217 struct task_struct *st_task; 218 struct o2net_sock_container *st_sc; 219 u32 st_id; 220 u32 st_msg_type; 221 u32 st_msg_key; 222 u8 st_node; 223 struct timeval st_sock_time; 224 struct timeval st_send_time; 225 struct timeval st_status_time; 226 }; 227 #else 228 struct o2net_send_tracking { 229 u32 dummy; 230 }; 231 #endif /* CONFIG_DEBUG_FS */ 232 233 #endif /* O2CLUSTER_TCP_INTERNAL_H */ 234