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TOMOYO Linux Cross Reference
Linux/fs/ocfs2/cluster/tcp_internal.h

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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 /* we're delaying our quorum decision so that heartbeat will have timed
 31  * out truly dead nodes by the time we come around to making decisions
 32  * on their number */
 33 #define O2NET_QUORUM_DELAY_MS   ((o2hb_dead_threshold + 2) * O2HB_REGION_TIMEOUT_MS)
 34 
 35 /*
 36  * This version number represents quite a lot, unfortunately.  It not
 37  * only represents the raw network message protocol on the wire but also
 38  * locking semantics of the file system using the protocol.  It should
 39  * be somewhere else, I'm sure, but right now it isn't.
 40  *
 41  * With version 11, we separate out the filesystem locking portion.  The
 42  * filesystem now has a major.minor version it negotiates.  Version 11
 43  * introduces this negotiation to the o2dlm protocol, and as such the
 44  * version here in tcp_internal.h should not need to be bumped for
 45  * filesystem locking changes.
 46  *
 47  * New in version 11
 48  *      - Negotiation of filesystem locking in the dlm join.
 49  *
 50  * New in version 10:
 51  *      - Meta/data locks combined
 52  *
 53  * New in version 9:
 54  *      - All votes removed
 55  *
 56  * New in version 8:
 57  *      - Replace delete inode votes with a cluster lock
 58  *
 59  * New in version 7:
 60  *      - DLM join domain includes the live nodemap
 61  *
 62  * New in version 6:
 63  *      - DLM lockres remote refcount fixes.
 64  *
 65  * New in version 5:
 66  *      - Network timeout checking protocol
 67  *
 68  * New in version 4:
 69  *      - Remove i_generation from lock names for better stat performance.
 70  *
 71  * New in version 3:
 72  *      - Replace dentry votes with a cluster lock
 73  *
 74  * New in version 2:
 75  *      - full 64 bit i_size in the metadata lock lvbs
 76  *      - introduction of "rw" lock and pushing meta/data locking down
 77  */
 78 #define O2NET_PROTOCOL_VERSION 11ULL
 79 struct o2net_handshake {
 80         __be64  protocol_version;
 81         __be64  connector_id;
 82         __be32  o2hb_heartbeat_timeout_ms;
 83         __be32  o2net_idle_timeout_ms;
 84         __be32  o2net_keepalive_delay_ms;
 85         __be32  o2net_reconnect_delay_ms;
 86 };
 87 
 88 struct o2net_node {
 89         /* this is never called from int/bh */
 90         spinlock_t                      nn_lock;
 91 
 92         /* set the moment an sc is allocated and a connect is started */
 93         struct o2net_sock_container     *nn_sc;
 94         /* _valid is only set after the handshake passes and tx can happen */
 95         unsigned                        nn_sc_valid:1;
 96         /* if this is set tx just returns it */
 97         int                             nn_persistent_error;
 98         /* It is only set to 1 after the idle time out. */
 99         atomic_t                        nn_timeout;
100 
101         /* threads waiting for an sc to arrive wait on the wq for generation
102          * to increase.  it is increased when a connecting socket succeeds
103          * or fails or when an accepted socket is attached. */
104         wait_queue_head_t               nn_sc_wq;
105 
106         struct idr                      nn_status_idr;
107         struct list_head                nn_status_list;
108 
109         /* connects are attempted from when heartbeat comes up until either hb
110          * goes down, the node is unconfigured, no connect attempts succeed
111          * before O2NET_CONN_IDLE_DELAY, or a connect succeeds.  connect_work
112          * is queued from set_nn_state both from hb up and from itself if a
113          * connect attempt fails and so can be self-arming.  shutdown is
114          * careful to first mark the nn such that no connects will be attempted
115          * before canceling delayed connect work and flushing the queue. */
116         struct delayed_work             nn_connect_work;
117         unsigned long                   nn_last_connect_attempt;
118 
119         /* this is queued as nodes come up and is canceled when a connection is
120          * established.  this expiring gives up on the node and errors out
121          * transmits */
122         struct delayed_work             nn_connect_expired;
123 
124         /* after we give up on a socket we wait a while before deciding
125          * that it is still heartbeating and that we should do some
126          * quorum work */
127         struct delayed_work             nn_still_up;
128 };
129 
130 struct o2net_sock_container {
131         struct kref             sc_kref;
132         /* the next two are valid for the life time of the sc */
133         struct socket           *sc_sock;
134         struct o2nm_node        *sc_node;
135 
136         /* all of these sc work structs hold refs on the sc while they are
137          * queued.  they should not be able to ref a freed sc.  the teardown
138          * race is with o2net_wq destruction in o2net_stop_listening() */
139 
140         /* rx and connect work are generated from socket callbacks.  sc
141          * shutdown removes the callbacks and then flushes the work queue */
142         struct work_struct      sc_rx_work;
143         struct work_struct      sc_connect_work;
144         /* shutdown work is triggered in two ways.  the simple way is
145          * for a code path calls ensure_shutdown which gets a lock, removes
146          * the sc from the nn, and queues the work.  in this case the
147          * work is single-shot.  the work is also queued from a sock
148          * callback, though, and in this case the work will find the sc
149          * still on the nn and will call ensure_shutdown itself.. this
150          * ends up triggering the shutdown work again, though nothing
151          * will be done in that second iteration.  so work queue teardown
152          * has to be careful to remove the sc from the nn before waiting
153          * on the work queue so that the shutdown work doesn't remove the
154          * sc and rearm itself.
155          */
156         struct work_struct      sc_shutdown_work;
157 
158         struct timer_list       sc_idle_timeout;
159         struct delayed_work     sc_keepalive_work;
160 
161         unsigned                sc_handshake_ok:1;
162 
163         struct page             *sc_page;
164         size_t                  sc_page_off;
165 
166         /* original handlers for the sockets */
167         void                    (*sc_state_change)(struct sock *sk);
168         void                    (*sc_data_ready)(struct sock *sk);
169 
170         u32                     sc_msg_key;
171         u16                     sc_msg_type;
172 
173 #ifdef CONFIG_DEBUG_FS
174         struct list_head        sc_net_debug_item;
175         ktime_t                 sc_tv_timer;
176         ktime_t                 sc_tv_data_ready;
177         ktime_t                 sc_tv_advance_start;
178         ktime_t                 sc_tv_advance_stop;
179         ktime_t                 sc_tv_func_start;
180         ktime_t                 sc_tv_func_stop;
181 #endif
182 #ifdef CONFIG_OCFS2_FS_STATS
183         ktime_t                 sc_tv_acquiry_total;
184         ktime_t                 sc_tv_send_total;
185         ktime_t                 sc_tv_status_total;
186         u32                     sc_send_count;
187         u32                     sc_recv_count;
188         ktime_t                 sc_tv_process_total;
189 #endif
190         struct mutex            sc_send_lock;
191 };
192 
193 struct o2net_msg_handler {
194         struct rb_node          nh_node;
195         u32                     nh_max_len;
196         u32                     nh_msg_type;
197         u32                     nh_key;
198         o2net_msg_handler_func  *nh_func;
199         o2net_msg_handler_func  *nh_func_data;
200         o2net_post_msg_handler_func
201                                 *nh_post_func;
202         struct kref             nh_kref;
203         struct list_head        nh_unregister_item;
204 };
205 
206 enum o2net_system_error {
207         O2NET_ERR_NONE = 0,
208         O2NET_ERR_NO_HNDLR,
209         O2NET_ERR_OVERFLOW,
210         O2NET_ERR_DIED,
211         O2NET_ERR_MAX
212 };
213 
214 struct o2net_status_wait {
215         enum o2net_system_error ns_sys_status;
216         s32                     ns_status;
217         int                     ns_id;
218         wait_queue_head_t       ns_wq;
219         struct list_head        ns_node_item;
220 };
221 
222 #ifdef CONFIG_DEBUG_FS
223 /* just for state dumps */
224 struct o2net_send_tracking {
225         struct list_head                st_net_debug_item;
226         struct task_struct              *st_task;
227         struct o2net_sock_container     *st_sc;
228         u32                             st_id;
229         u32                             st_msg_type;
230         u32                             st_msg_key;
231         u8                              st_node;
232         ktime_t                         st_sock_time;
233         ktime_t                         st_send_time;
234         ktime_t                         st_status_time;
235 };
236 #else
237 struct o2net_send_tracking {
238         u32     dummy;
239 };
240 #endif  /* CONFIG_DEBUG_FS */
241 
242 #endif /* O2CLUSTER_TCP_INTERNAL_H */
243 

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