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 /* same as hb delay, we're waiting for another node to recognize our hb */ 31 #define O2NET_RECONNECT_DELAY_MS O2HB_REGION_TIMEOUT_MS 32 33 /* we're delaying our quorum decision so that heartbeat will have timed 34 * out truly dead nodes by the time we come around to making decisions 35 * on their number */ 36 #define O2NET_QUORUM_DELAY_MS ((o2hb_dead_threshold + 2) * O2HB_REGION_TIMEOUT_MS) 37 38 #define O2NET_KEEPALIVE_DELAY_SECS 5 39 #define O2NET_IDLE_TIMEOUT_SECS 10 40 41 /* 42 * This version number represents quite a lot, unfortunately. It not 43 * only represents the raw network message protocol on the wire but also 44 * locking semantics of the file system using the protocol. It should 45 * be somewhere else, I'm sure, but right now it isn't. 46 * 47 * New in version 2: 48 * - full 64 bit i_size in the metadata lock lvbs 49 * - introduction of "rw" lock and pushing meta/data locking down 50 */ 51 #define O2NET_PROTOCOL_VERSION 2ULL 52 struct o2net_handshake { 53 __be64 protocol_version; 54 __be64 connector_id; 55 }; 56 57 struct o2net_node { 58 /* this is never called from int/bh */ 59 spinlock_t nn_lock; 60 61 /* set the moment an sc is allocated and a connect is started */ 62 struct o2net_sock_container *nn_sc; 63 /* _valid is only set after the handshake passes and tx can happen */ 64 unsigned nn_sc_valid:1; 65 /* if this is set tx just returns it */ 66 int nn_persistent_error; 67 68 /* threads waiting for an sc to arrive wait on the wq for generation 69 * to increase. it is increased when a connecting socket succeeds 70 * or fails or when an accepted socket is attached. */ 71 wait_queue_head_t nn_sc_wq; 72 73 struct idr nn_status_idr; 74 struct list_head nn_status_list; 75 76 /* connects are attempted from when heartbeat comes up until either hb 77 * goes down, the node is unconfigured, no connect attempts succeed 78 * before O2NET_CONN_IDLE_DELAY, or a connect succeeds. connect_work 79 * is queued from set_nn_state both from hb up and from itself if a 80 * connect attempt fails and so can be self-arming. shutdown is 81 * careful to first mark the nn such that no connects will be attempted 82 * before canceling delayed connect work and flushing the queue. */ 83 struct work_struct nn_connect_work; 84 unsigned long nn_last_connect_attempt; 85 86 /* this is queued as nodes come up and is canceled when a connection is 87 * established. this expiring gives up on the node and errors out 88 * transmits */ 89 struct work_struct nn_connect_expired; 90 91 /* after we give up on a socket we wait a while before deciding 92 * that it is still heartbeating and that we should do some 93 * quorum work */ 94 struct work_struct nn_still_up; 95 }; 96 97 struct o2net_sock_container { 98 struct kref sc_kref; 99 /* the next two are vaild for the life time of the sc */ 100 struct socket *sc_sock; 101 struct o2nm_node *sc_node; 102 103 /* all of these sc work structs hold refs on the sc while they are 104 * queued. they should not be able to ref a freed sc. the teardown 105 * race is with o2net_wq destruction in o2net_stop_listening() */ 106 107 /* rx and connect work are generated from socket callbacks. sc 108 * shutdown removes the callbacks and then flushes the work queue */ 109 struct work_struct sc_rx_work; 110 struct work_struct sc_connect_work; 111 /* shutdown work is triggered in two ways. the simple way is 112 * for a code path calls ensure_shutdown which gets a lock, removes 113 * the sc from the nn, and queues the work. in this case the 114 * work is single-shot. the work is also queued from a sock 115 * callback, though, and in this case the work will find the sc 116 * still on the nn and will call ensure_shutdown itself.. this 117 * ends up triggering the shutdown work again, though nothing 118 * will be done in that second iteration. so work queue teardown 119 * has to be careful to remove the sc from the nn before waiting 120 * on the work queue so that the shutdown work doesn't remove the 121 * sc and rearm itself. 122 */ 123 struct work_struct sc_shutdown_work; 124 125 struct timer_list sc_idle_timeout; 126 struct work_struct sc_keepalive_work; 127 128 unsigned sc_handshake_ok:1; 129 130 struct page *sc_page; 131 size_t sc_page_off; 132 133 /* original handlers for the sockets */ 134 void (*sc_state_change)(struct sock *sk); 135 void (*sc_data_ready)(struct sock *sk, int bytes); 136 137 struct timeval sc_tv_timer; 138 struct timeval sc_tv_data_ready; 139 struct timeval sc_tv_advance_start; 140 struct timeval sc_tv_advance_stop; 141 struct timeval sc_tv_func_start; 142 struct timeval sc_tv_func_stop; 143 u32 sc_msg_key; 144 u16 sc_msg_type; 145 }; 146 147 struct o2net_msg_handler { 148 struct rb_node nh_node; 149 u32 nh_max_len; 150 u32 nh_msg_type; 151 u32 nh_key; 152 o2net_msg_handler_func *nh_func; 153 o2net_msg_handler_func *nh_func_data; 154 struct kref nh_kref; 155 struct list_head nh_unregister_item; 156 }; 157 158 enum o2net_system_error { 159 O2NET_ERR_NONE = 0, 160 O2NET_ERR_NO_HNDLR, 161 O2NET_ERR_OVERFLOW, 162 O2NET_ERR_DIED, 163 O2NET_ERR_MAX 164 }; 165 166 struct o2net_status_wait { 167 enum o2net_system_error ns_sys_status; 168 s32 ns_status; 169 int ns_id; 170 wait_queue_head_t ns_wq; 171 struct list_head ns_node_item; 172 }; 173 174 #endif /* O2CLUSTER_TCP_INTERNAL_H */ 175