LXR linux/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
  40struct 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
  53typedef int (o2net_msg_handler_func)(struct o2net_msg *msg, u32 len, void *data,
  54                                     void **ret_data);
  55typedef 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.... */
  68static 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
  93enum {
  94        O2NET_DRIVER_UNINITED,
  95        O2NET_DRIVER_READY,
  96};
  97
  98int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
  99                       u8 target_node, int *status);
 100int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *vec,
 101                           size_t veclen, u8 target_node, int *status);
 102
 103int 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);
 107void o2net_unregister_handler_list(struct list_head *list);
 108
 109struct o2nm_node;
 110int o2net_register_hb_callbacks(void);
 111void o2net_unregister_hb_callbacks(void);
 112int o2net_start_listening(struct o2nm_node *node);
 113void o2net_stop_listening(struct o2nm_node *node);
 114void o2net_disconnect_node(struct o2nm_node *node);
 115int o2net_num_connected_peers(void);
 116
 117int o2net_init(void);
 118void o2net_exit(void);
 119
 120struct o2net_send_tracking;
 121struct o2net_sock_container;
 122
 123#ifdef CONFIG_DEBUG_FS
 124int o2net_debugfs_init(void);
 125void o2net_debugfs_exit(void);
 126void o2net_debug_add_nst(struct o2net_send_tracking *nst);
 127void o2net_debug_del_nst(struct o2net_send_tracking *nst);
 128void o2net_debug_add_sc(struct o2net_sock_container *sc);
 129void o2net_debug_del_sc(struct o2net_sock_container *sc);
 130#else
 131static inline int o2net_debugfs_init(void)
 132{
 133        return 0;
 134}
 135static inline void o2net_debugfs_exit(void)
 136{
 137}
 138static inline void o2net_debug_add_nst(struct o2net_send_tracking *nst)
 139{
 140}
 141static inline void o2net_debug_del_nst(struct o2net_send_tracking *nst)
 142{
 143}
 144static inline void o2net_debug_add_sc(struct o2net_sock_container *sc)
 145{
 146}
 147static inline void o2net_debug_del_sc(struct o2net_sock_container *sc)
 148{
 149}
 150#endif  /* CONFIG_DEBUG_FS */
 151
 152#endif /* O2CLUSTER_TCP_H */
 153