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authorZach Brown <zach.brown@oracle.com>2005-12-15 14:31:23 -0800
committerJoel Becker <joel.becker@oracle.com>2006-01-03 11:45:46 -0800
commit98211489d4147e41b11703e4245846d60b3acce4 (patch)
treef3c9c6b8df5bb001db79bc6314d8cbb5e127b45b /fs/ocfs2/cluster/tcp_internal.h
parenta7f6a5fb4bde142b622706e2006ba33f793e13ed (diff)
[PATCH] OCFS2: The Second Oracle Cluster Filesystem
Node messaging via tcp. Used by the dlm and the file system for point to point communication between nodes. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com> Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>
Diffstat (limited to 'fs/ocfs2/cluster/tcp_internal.h')
-rw-r--r--fs/ocfs2/cluster/tcp_internal.h174
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
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+++ b/fs/ocfs2/cluster/tcp_internal.h
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+/* -*- 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 */