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 * New in version 8: 42 * - Replace delete inode votes with a cluster lock 43 * 44 * New in version 7: 45 * - DLM join domain includes the live nodemap 46 * 47 * New in version 6: 48 * - DLM lockres remote refcount fixes. 49 * 50 * New in version 5: 51 * - Network timeout checking protocol 52 * 53 * New in version 4: 54 * - Remove i_generation from lock names for better stat performance. 55 * 56 * New in version 3: 57 * - Replace dentry votes with a cluster lock 58 * 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 */ 63 #define O2NET_PROTOCOL_VERSION 8ULL 64 struct o2net_handshake { 65 __be64 protocol_version; 66 __be64 connector_id; 67 __be32 o2hb_heartbeat_timeout_ms; 68 __be32 o2net_idle_timeout_ms; 69 __be32 o2net_keepalive_delay_ms; 70 __be32 o2net_reconnect_delay_ms; 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. */ 99 struct delayed_work nn_connect_work; 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 */ 105 struct delayed_work nn_connect_expired; 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 */ 110 struct delayed_work nn_still_up; 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; 142 struct delayed_work sc_keepalive_work; 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; 161 162 struct mutex sc_send_lock; 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; 172 o2net_post_msg_handler_func 173 *nh_post_func; 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 */ 195