fs/ocfs2/cluster/tcp.h

   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 struct o2nm_node;
 110 int o2net_register_hb_callbacks(void);
 111 void o2net_unregister_hb_callbacks(void);
 112 int o2net_start_listening(struct o2nm_node *node);
 113 void o2net_stop_listening(struct o2nm_node *node);
 114 void o2net_disconnect_node(struct o2nm_node *node);
 115 int o2net_num_connected_peers(void);
 116
 117 int o2net_init(void);
 118 void o2net_exit(void);
 119
 120 #endif /* O2CLUSTER_TCP_H */