181 lines
6.1 KiB
C
181 lines
6.1 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* Copyright (C) 2005 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef O2CLUSTER_TCP_INTERNAL_H
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#define O2CLUSTER_TCP_INTERNAL_H
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#define O2NET_MSG_MAGIC ((u16)0xfa55)
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#define O2NET_MSG_STATUS_MAGIC ((u16)0xfa56)
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#define O2NET_MSG_KEEP_REQ_MAGIC ((u16)0xfa57)
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#define O2NET_MSG_KEEP_RESP_MAGIC ((u16)0xfa58)
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/* same as hb delay, we're waiting for another node to recognize our hb */
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#define O2NET_RECONNECT_DELAY_MS O2HB_REGION_TIMEOUT_MS
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/* we're delaying our quorum decision so that heartbeat will have timed
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* out truly dead nodes by the time we come around to making decisions
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* on their number */
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#define O2NET_QUORUM_DELAY_MS ((o2hb_dead_threshold + 2) * O2HB_REGION_TIMEOUT_MS)
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#define O2NET_KEEPALIVE_DELAY_SECS 5
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#define O2NET_IDLE_TIMEOUT_SECS 10
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/*
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* This version number represents quite a lot, unfortunately. It not
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* only represents the raw network message protocol on the wire but also
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* locking semantics of the file system using the protocol. It should
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* be somewhere else, I'm sure, but right now it isn't.
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*
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* New in version 4:
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* - Remove i_generation from lock names for better stat performance.
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*
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* New in version 3:
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* - Replace dentry votes with a cluster lock
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*
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* New in version 2:
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* - full 64 bit i_size in the metadata lock lvbs
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* - introduction of "rw" lock and pushing meta/data locking down
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*/
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#define O2NET_PROTOCOL_VERSION 4ULL
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struct o2net_handshake {
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__be64 protocol_version;
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__be64 connector_id;
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};
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struct o2net_node {
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/* this is never called from int/bh */
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spinlock_t nn_lock;
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/* set the moment an sc is allocated and a connect is started */
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struct o2net_sock_container *nn_sc;
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/* _valid is only set after the handshake passes and tx can happen */
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unsigned nn_sc_valid:1;
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/* if this is set tx just returns it */
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int nn_persistent_error;
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/* threads waiting for an sc to arrive wait on the wq for generation
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* to increase. it is increased when a connecting socket succeeds
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* or fails or when an accepted socket is attached. */
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wait_queue_head_t nn_sc_wq;
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struct idr nn_status_idr;
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struct list_head nn_status_list;
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/* connects are attempted from when heartbeat comes up until either hb
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* goes down, the node is unconfigured, no connect attempts succeed
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* before O2NET_CONN_IDLE_DELAY, or a connect succeeds. connect_work
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* is queued from set_nn_state both from hb up and from itself if a
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* connect attempt fails and so can be self-arming. shutdown is
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* careful to first mark the nn such that no connects will be attempted
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* before canceling delayed connect work and flushing the queue. */
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struct delayed_work nn_connect_work;
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unsigned long nn_last_connect_attempt;
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/* this is queued as nodes come up and is canceled when a connection is
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* established. this expiring gives up on the node and errors out
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* transmits */
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struct delayed_work nn_connect_expired;
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/* after we give up on a socket we wait a while before deciding
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* that it is still heartbeating and that we should do some
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* quorum work */
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struct delayed_work nn_still_up;
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};
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struct o2net_sock_container {
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struct kref sc_kref;
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/* the next two are vaild for the life time of the sc */
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struct socket *sc_sock;
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struct o2nm_node *sc_node;
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/* all of these sc work structs hold refs on the sc while they are
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* queued. they should not be able to ref a freed sc. the teardown
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* race is with o2net_wq destruction in o2net_stop_listening() */
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/* rx and connect work are generated from socket callbacks. sc
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* shutdown removes the callbacks and then flushes the work queue */
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struct work_struct sc_rx_work;
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struct work_struct sc_connect_work;
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/* shutdown work is triggered in two ways. the simple way is
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* for a code path calls ensure_shutdown which gets a lock, removes
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* the sc from the nn, and queues the work. in this case the
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* work is single-shot. the work is also queued from a sock
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* callback, though, and in this case the work will find the sc
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* still on the nn and will call ensure_shutdown itself.. this
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* ends up triggering the shutdown work again, though nothing
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* will be done in that second iteration. so work queue teardown
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* has to be careful to remove the sc from the nn before waiting
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* on the work queue so that the shutdown work doesn't remove the
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* sc and rearm itself.
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*/
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struct work_struct sc_shutdown_work;
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struct timer_list sc_idle_timeout;
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struct delayed_work sc_keepalive_work;
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unsigned sc_handshake_ok:1;
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struct page *sc_page;
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size_t sc_page_off;
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/* original handlers for the sockets */
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void (*sc_state_change)(struct sock *sk);
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void (*sc_data_ready)(struct sock *sk, int bytes);
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struct timeval sc_tv_timer;
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struct timeval sc_tv_data_ready;
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struct timeval sc_tv_advance_start;
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struct timeval sc_tv_advance_stop;
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struct timeval sc_tv_func_start;
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struct timeval sc_tv_func_stop;
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u32 sc_msg_key;
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u16 sc_msg_type;
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};
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struct o2net_msg_handler {
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struct rb_node nh_node;
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u32 nh_max_len;
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u32 nh_msg_type;
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u32 nh_key;
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o2net_msg_handler_func *nh_func;
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o2net_msg_handler_func *nh_func_data;
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struct kref nh_kref;
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struct list_head nh_unregister_item;
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};
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enum o2net_system_error {
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O2NET_ERR_NONE = 0,
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O2NET_ERR_NO_HNDLR,
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O2NET_ERR_OVERFLOW,
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O2NET_ERR_DIED,
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O2NET_ERR_MAX
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};
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struct o2net_status_wait {
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enum o2net_system_error ns_sys_status;
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s32 ns_status;
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int ns_id;
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wait_queue_head_t ns_wq;
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struct list_head ns_node_item;
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};
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#endif /* O2CLUSTER_TCP_INTERNAL_H */
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