summaryrefslogtreecommitdiffstats
path: root/fs/ocfs2/cluster/tcp_internal.h
blob: e6a2b9dfcd16ab07e0aa5ad215bbdc0b86e80e55 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
/* SPDX-License-Identifier: GPL-2.0-or-later */
/* -*- mode: c; c-basic-offset: 8; -*-
 * vim: noexpandtab sw=8 ts=8 sts=0:
 *
 * Copyright (C) 2005 Oracle.  All rights reserved.
 */

#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)

/* 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)

/*
 * 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.
 *
 * With version 11, we separate out the filesystem locking portion.  The
 * filesystem now has a major.minor version it negotiates.  Version 11
 * introduces this negotiation to the o2dlm protocol, and as such the
 * version here in tcp_internal.h should not need to be bumped for
 * filesystem locking changes.
 *
 * New in version 11
 * 	- Negotiation of filesystem locking in the dlm join.
 *
 * New in version 10:
 * 	- Meta/data locks combined
 *
 * New in version 9:
 * 	- All votes removed
 *
 * New in version 8:
 * 	- Replace delete inode votes with a cluster lock
 *
 * New in version 7:
 * 	- DLM join domain includes the live nodemap
 *
 * New in version 6:
 * 	- DLM lockres remote refcount fixes.
 *
 * New in version 5:
 * 	- Network timeout checking protocol
 *
 * New in version 4:
 * 	- Remove i_generation from lock names for better stat performance.
 *
 * New in version 3:
 * 	- Replace dentry votes with a cluster lock
 *
 * 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 11ULL
struct o2net_handshake {
	__be64	protocol_version;
	__be64	connector_id;
	__be32  o2hb_heartbeat_timeout_ms;
	__be32  o2net_idle_timeout_ms;
	__be32  o2net_keepalive_delay_ms;
	__be32  o2net_reconnect_delay_ms;
};

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;
	/* It is only set to 1 after the idle time out. */
	atomic_t			nn_timeout;

	/* 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, 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 delayed_work		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 delayed_work		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 delayed_work		nn_still_up;
};

struct o2net_sock_container {
	struct kref		sc_kref;
	/* the next two are valid 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 delayed_work	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);

	u32			sc_msg_key;
	u16			sc_msg_type;

#ifdef CONFIG_DEBUG_FS
	struct list_head        sc_net_debug_item;
	ktime_t			sc_tv_timer;
	ktime_t			sc_tv_data_ready;
	ktime_t			sc_tv_advance_start;
	ktime_t			sc_tv_advance_stop;
	ktime_t			sc_tv_func_start;
	ktime_t			sc_tv_func_stop;
#endif
#ifdef CONFIG_OCFS2_FS_STATS
	ktime_t			sc_tv_acquiry_total;
	ktime_t			sc_tv_send_total;
	ktime_t			sc_tv_status_total;
	u32			sc_send_count;
	u32			sc_recv_count;
	ktime_t			sc_tv_process_total;
#endif
	struct mutex		sc_send_lock;
};

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;
	void			*nh_func_data;
	o2net_post_msg_handler_func
				*nh_post_func;
	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;
};

#ifdef CONFIG_DEBUG_FS
/* just for state dumps */
struct o2net_send_tracking {
	struct list_head		st_net_debug_item;
	struct task_struct		*st_task;
	struct o2net_sock_container	*st_sc;
	u32				st_id;
	u32				st_msg_type;
	u32				st_msg_key;
	u8				st_node;
	ktime_t				st_sock_time;
	ktime_t				st_send_time;
	ktime_t				st_status_time;
};
#else
struct o2net_send_tracking {
	u32	dummy;
};
#endif	/* CONFIG_DEBUG_FS */

#endif /* O2CLUSTER_TCP_INTERNAL_H */