projects / deliverable / linux.git / blame
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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 | ||
| 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 */ |