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/*
* net/tipc/node_subscr.c: TIPC "node down" subscription handling
*
* Copyright (c) 1995-2006, Ericsson AB
* Copyright (c) 2005, 2010-2011, Wind River Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "core.h"
#include "node_subscr.h"
#include "node.h"
/**
* tipc_nodesub_subscribe - create "node down" subscription for specified node
*/
void tipc_nodesub_subscribe(struct tipc_node_subscr *node_sub, u32 addr,
void *usr_handle, net_ev_handler handle_down)
{
if (in_own_node(addr)) {
node_sub->node = NULL;
return;
}
node_sub->node = tipc_node_find(addr);
if (!node_sub->node) {
pr_warn("Node subscription rejected, unknown node 0x%x\n",
addr);
return;
}
node_sub->handle_node_down = handle_down;
node_sub->usr_handle = usr_handle;
tipc_node_lock(node_sub->node);
list_add_tail(&node_sub->nodesub_list, &node_sub->node->nsub);
tipc_node_unlock(node_sub->node);
}
/**
* tipc_nodesub_unsubscribe - cancel "node down" subscription (if any)
*/
void tipc_nodesub_unsubscribe(struct tipc_node_subscr *node_sub)
{
if (!node_sub->node)
return;
tipc_node_lock(node_sub->node);
list_del_init(&node_sub->nodesub_list);
tipc_node_unlock(node_sub->node);
}
/**
* tipc_nodesub_notify - notify subscribers that a node is unreachable
*
* Note: node is locked by caller
*/
void tipc_nodesub_notify(struct tipc_node *node)
{
struct tipc_node_subscr *ns;
list_for_each_entry(ns, &node->nsub, nodesub_list) {
if (ns->handle_node_down) {
tipc_k_signal((Handler)ns->handle_node_down,
(unsigned long)ns->usr_handle);
ns->handle_node_down = NULL;
}
}
}
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