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Diffstat (limited to 'fs/ocfs2/cluster/tcp_internal.h')
| -rw-r--r-- | fs/ocfs2/cluster/tcp_internal.h | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/fs/ocfs2/cluster/tcp_internal.h b/fs/ocfs2/cluster/tcp_internal.h new file mode 100644 index 00000000000000..ff9e2e2104c245 --- /dev/null +++ b/fs/ocfs2/cluster/tcp_internal.h @@ -0,0 +1,174 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * Copyright (C) 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef O2CLUSTER_TCP_INTERNAL_H +#define O2CLUSTER_TCP_INTERNAL_H + +#define O2NET_MSG_MAGIC ((u16)0xfa55) +#define O2NET_MSG_STATUS_MAGIC ((u16)0xfa56) +#define O2NET_MSG_KEEP_REQ_MAGIC ((u16)0xfa57) +#define O2NET_MSG_KEEP_RESP_MAGIC ((u16)0xfa58) + +/* same as hb delay, we're waiting for another node to recognize our hb */ +#define O2NET_RECONNECT_DELAY_MS O2HB_REGION_TIMEOUT_MS + +/* we're delaying our quorum decision so that heartbeat will have timed + * out truly dead nodes by the time we come around to making decisions + * on their number */ +#define O2NET_QUORUM_DELAY_MS ((o2hb_dead_threshold + 2) * O2HB_REGION_TIMEOUT_MS) + +#define O2NET_KEEPALIVE_DELAY_SECS 5 +#define O2NET_IDLE_TIMEOUT_SECS 10 + +/* + * This version number represents quite a lot, unfortunately. It not + * only represents the raw network message protocol on the wire but also + * locking semantics of the file system using the protocol. It should + * be somewhere else, I'm sure, but right now it isn't. + * + * New in version 2: + * - full 64 bit i_size in the metadata lock lvbs + * - introduction of "rw" lock and pushing meta/data locking down + */ +#define O2NET_PROTOCOL_VERSION 2ULL +struct o2net_handshake { + __be64 protocol_version; + __be64 connector_id; +}; + +struct o2net_node { + /* this is never called from int/bh */ + spinlock_t nn_lock; + + /* set the moment an sc is allocated and a connect is started */ + struct o2net_sock_container *nn_sc; + /* _valid is only set after the handshake passes and tx can happen */ + unsigned nn_sc_valid:1; + /* if this is set tx just returns it */ + int nn_persistent_error; + + /* threads waiting for an sc to arrive wait on the wq for generation + * to increase. it is increased when a connecting socket succeeds + * or fails or when an accepted socket is attached. */ + wait_queue_head_t nn_sc_wq; + + struct idr nn_status_idr; + struct list_head nn_status_list; + + /* connects are attempted from when heartbeat comes up until either hb + * goes down, the node is unconfigured, no connect attempts succeed + * before O2NET_CONN_IDLE_DELAY, or a connect succeeds. connect_work + * is queued from set_nn_state both from hb up and from itself if a + * connect attempt fails and so can be self-arming. shutdown is + * careful to first mark the nn such that no connects will be attempted + * before canceling delayed connect work and flushing the queue. */ + struct work_struct nn_connect_work; + unsigned long nn_last_connect_attempt; + + /* this is queued as nodes come up and is canceled when a connection is + * established. this expiring gives up on the node and errors out + * transmits */ + struct work_struct nn_connect_expired; + + /* after we give up on a socket we wait a while before deciding + * that it is still heartbeating and that we should do some + * quorum work */ + struct work_struct nn_still_up; +}; + +struct o2net_sock_container { + struct kref sc_kref; + /* the next two are vaild for the life time of the sc */ + struct socket *sc_sock; + struct o2nm_node *sc_node; + + /* all of these sc work structs hold refs on the sc while they are + * queued. they should not be able to ref a freed sc. the teardown + * race is with o2net_wq destruction in o2net_stop_listening() */ + + /* rx and connect work are generated from socket callbacks. sc + * shutdown removes the callbacks and then flushes the work queue */ + struct work_struct sc_rx_work; + struct work_struct sc_connect_work; + /* shutdown work is triggered in two ways. the simple way is + * for a code path calls ensure_shutdown which gets a lock, removes + * the sc from the nn, and queues the work. in this case the + * work is single-shot. the work is also queued from a sock + * callback, though, and in this case the work will find the sc + * still on the nn and will call ensure_shutdown itself.. this + * ends up triggering the shutdown work again, though nothing + * will be done in that second iteration. so work queue teardown + * has to be careful to remove the sc from the nn before waiting + * on the work queue so that the shutdown work doesn't remove the + * sc and rearm itself. + */ + struct work_struct sc_shutdown_work; + + struct timer_list sc_idle_timeout; + struct work_struct sc_keepalive_work; + + unsigned sc_handshake_ok:1; + + struct page *sc_page; + size_t sc_page_off; + + /* original handlers for the sockets */ + void (*sc_state_change)(struct sock *sk); + void (*sc_data_ready)(struct sock *sk, int bytes); + + struct timeval sc_tv_timer; + struct timeval sc_tv_data_ready; + struct timeval sc_tv_advance_start; + struct timeval sc_tv_advance_stop; + struct timeval sc_tv_func_start; + struct timeval sc_tv_func_stop; + u32 sc_msg_key; + u16 sc_msg_type; +}; + +struct o2net_msg_handler { + struct rb_node nh_node; + u32 nh_max_len; + u32 nh_msg_type; + u32 nh_key; + o2net_msg_handler_func *nh_func; + o2net_msg_handler_func *nh_func_data; + struct kref nh_kref; + struct list_head nh_unregister_item; +}; + +enum o2net_system_error { + O2NET_ERR_NONE = 0, + O2NET_ERR_NO_HNDLR, + O2NET_ERR_OVERFLOW, + O2NET_ERR_DIED, + O2NET_ERR_MAX +}; + +struct o2net_status_wait { + enum o2net_system_error ns_sys_status; + s32 ns_status; + int ns_id; + wait_queue_head_t ns_wq; + struct list_head ns_node_item; +}; + +#endif /* O2CLUSTER_TCP_INTERNAL_H */ |