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

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  1 /* -*- mode: c; c-basic-offset: 8; -*-
  2  * vim: noexpandtab sw=8 ts=8 sts=0:
  3  *
  4  * tcp.h
  5  *
  6  * Function prototypes
  7  *
  8  * Copyright (C) 2004 Oracle.  All rights reserved.
  9  *
 10  * This program is free software; you can redistribute it and/or
 11  * modify it under the terms of the GNU General Public
 12  * License as published by the Free Software Foundation; either
 13  * version 2 of the License, or (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 18  * General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public
 21  * License along with this program; if not, write to the
 22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 23  * Boston, MA 021110-1307, USA.
 24  *
 25  */
 26 
 27 #ifndef O2CLUSTER_TCP_H
 28 #define O2CLUSTER_TCP_H
 29 
 30 #include <linux/socket.h>
 31 #ifdef __KERNEL__
 32 #include <net/sock.h>
 33 #include <linux/tcp.h>
 34 #else
 35 #include <sys/socket.h>
 36 #endif
 37 #include <linux/inet.h>
 38 #include <linux/in.h>
 39 
 40 struct o2net_msg
 41 {
 42         __be16 magic;
 43         __be16 data_len;
 44         __be16 msg_type;
 45         __be16 pad1;
 46         __be32 sys_status;
 47         __be32 status;
 48         __be32 key;
 49         __be32 msg_num;
 50         __u8  buf[0];
 51 };
 52 
 53 typedef int (o2net_msg_handler_func)(struct o2net_msg *msg, u32 len, void *data,
 54                                      void **ret_data);
 55 typedef void (o2net_post_msg_handler_func)(int status, void *data,
 56                                            void *ret_data);
 57 
 58 #define O2NET_MAX_PAYLOAD_BYTES  (4096 - sizeof(struct o2net_msg))
 59 
 60 /* same as hb delay, we're waiting for another node to recognize our hb */
 61 #define O2NET_RECONNECT_DELAY_MS_DEFAULT        2000
 62 
 63 #define O2NET_KEEPALIVE_DELAY_MS_DEFAULT        2000
 64 #define O2NET_IDLE_TIMEOUT_MS_DEFAULT           30000
 65 
 66 
 67 /* TODO: figure this out.... */
 68 static inline int o2net_link_down(int err, struct socket *sock)
 69 {
 70         if (sock) {
 71                 if (sock->sk->sk_state != TCP_ESTABLISHED &&
 72                     sock->sk->sk_state != TCP_CLOSE_WAIT)
 73                         return 1;
 74         }
 75 
 76         if (err >= 0)
 77                 return 0;
 78         switch (err) {
 79                 /* ????????????????????????? */
 80                 case -ERESTARTSYS:
 81                 case -EBADF:
 82                 /* When the server has died, an ICMP port unreachable
 83                  * message prompts ECONNREFUSED. */
 84                 case -ECONNREFUSED:
 85                 case -ENOTCONN:
 86                 case -ECONNRESET:
 87                 case -EPIPE:
 88                         return 1;
 89         }
 90         return 0;
 91 }
 92 
 93 enum {
 94         O2NET_DRIVER_UNINITED,
 95         O2NET_DRIVER_READY,
 96 };
 97 
 98 int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
 99                        u8 target_node, int *status);
100 int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *vec,
101                            size_t veclen, u8 target_node, int *status);
102 
103 int o2net_register_handler(u32 msg_type, u32 key, u32 max_len,
104                            o2net_msg_handler_func *func, void *data,
105                            o2net_post_msg_handler_func *post_func,
106                            struct list_head *unreg_list);
107 void o2net_unregister_handler_list(struct list_head *list);
108 
109 void o2net_fill_node_map(unsigned long *map, unsigned bytes);
110 
111 struct o2nm_node;
112 int o2net_register_hb_callbacks(void);
113 void o2net_unregister_hb_callbacks(void);
114 int o2net_start_listening(struct o2nm_node *node);
115 void o2net_stop_listening(struct o2nm_node *node);
116 void o2net_disconnect_node(struct o2nm_node *node);
117 int o2net_num_connected_peers(void);
118 
119 int o2net_init(void);
120 void o2net_exit(void);
121 
122 struct o2net_send_tracking;
123 struct o2net_sock_container;
124 
125 #ifdef CONFIG_DEBUG_FS
126 int o2net_debugfs_init(void);
127 void o2net_debugfs_exit(void);
128 void o2net_debug_add_nst(struct o2net_send_tracking *nst);
129 void o2net_debug_del_nst(struct o2net_send_tracking *nst);
130 void o2net_debug_add_sc(struct o2net_sock_container *sc);
131 void o2net_debug_del_sc(struct o2net_sock_container *sc);
132 #else
133 static inline int o2net_debugfs_init(void)
134 {
135         return 0;
136 }
137 static inline void o2net_debugfs_exit(void)
138 {
139 }
140 static inline void o2net_debug_add_nst(struct o2net_send_tracking *nst)
141 {
142 }
143 static inline void o2net_debug_del_nst(struct o2net_send_tracking *nst)
144 {
145 }
146 static inline void o2net_debug_add_sc(struct o2net_sock_container *sc)
147 {
148 }
149 static inline void o2net_debug_del_sc(struct o2net_sock_container *sc)
150 {
151 }
152 #endif  /* CONFIG_DEBUG_FS */
153 
154 #endif /* O2CLUSTER_TCP_H */
155 

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