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1 | /* |
2 | * net/tipc/node_subscr.c: TIPC "node down" subscription handling |
3 | * |
4 | * Copyright (c) 1995-2006, Ericsson AB |
5 | * Copyright (c) 2005, 2010-2011, Wind River Systems |
6 | * All rights reserved. |
7 | * |
8 | * Redistribution and use in source and binary forms, with or without |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. |
13 | * 2. Redistributions in binary form must reproduce the above copyright |
14 | * notice, this list of conditions and the following disclaimer in the |
15 | * documentation and/or other materials provided with the distribution. |
16 | * 3. Neither the names of the copyright holders nor the names of its |
17 | * contributors may be used to endorse or promote products derived from |
18 | * this software without specific prior written permission. |
19 | * |
20 | * Alternatively, this software may be distributed under the terms of the |
21 | * GNU General Public License ("GPL") version 2 as published by the Free |
22 | * Software Foundation. |
23 | * |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ |
36 | |
37 | #include "core.h" |
38 | #include "node_subscr.h" |
39 | #include "node.h" |
40 | |
41 | /** |
42 | * tipc_nodesub_subscribe - create "node down" subscription for specified node |
43 | */ |
44 | void tipc_nodesub_subscribe(struct tipc_node_subscr *node_sub, u32 addr, |
45 | void *usr_handle, net_ev_handler handle_down) |
46 | { |
47 | if (in_own_node(addr)) { |
48 | node_sub->node = NULL; |
49 | return; |
50 | } |
51 | |
52 | node_sub->node = tipc_node_find(addr); |
53 | if (!node_sub->node) { |
54 | pr_warn("Node subscription rejected, unknown node 0x%x\n", |
55 | addr); |
56 | return; |
57 | } |
58 | node_sub->handle_node_down = handle_down; |
59 | node_sub->usr_handle = usr_handle; |
60 | |
61 | tipc_node_lock(node_sub->node); |
62 | list_add_tail(&node_sub->nodesub_list, &node_sub->node->nsub); |
63 | tipc_node_unlock(node_sub->node); |
64 | } |
65 | |
66 | /** |
67 | * tipc_nodesub_unsubscribe - cancel "node down" subscription (if any) |
68 | */ |
69 | void tipc_nodesub_unsubscribe(struct tipc_node_subscr *node_sub) |
70 | { |
71 | if (!node_sub->node) |
72 | return; |
73 | |
74 | tipc_node_lock(node_sub->node); |
75 | list_del_init(&node_sub->nodesub_list); |
76 | tipc_node_unlock(node_sub->node); |
77 | } |
78 | |
79 | /** |
80 | * tipc_nodesub_notify - notify subscribers that a node is unreachable |
81 | * |
82 | * Note: node is locked by caller |
83 | */ |
84 | void tipc_nodesub_notify(struct tipc_node *node) |
85 | { |
86 | struct tipc_node_subscr *ns; |
87 | |
88 | list_for_each_entry(ns, &node->nsub, nodesub_list) { |
89 | if (ns->handle_node_down) { |
90 | tipc_k_signal((Handler)ns->handle_node_down, |
91 | (unsigned long)ns->usr_handle); |
92 | ns->handle_node_down = NULL; |
93 | } |
94 | } |
95 | } |
96 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9