1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2002 Cluster File Systems, Inc.
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #define DEBUG_SUBSYSTEM S_RPC
27 #include <linux/lustre_net.h>
29 static spinlock_t conn_lock;
30 static struct list_head conn_list;
31 static struct list_head conn_unused_list;
33 struct ptlrpc_connection *ptlrpc_get_connection(struct lustre_peer *peer)
35 struct list_head *tmp, *pos;
36 struct ptlrpc_connection *c;
39 spin_lock(&conn_lock);
40 list_for_each(tmp, &conn_list) {
41 c = list_entry(tmp, struct ptlrpc_connection, c_link);
42 if (memcmp(peer, &c->c_peer, sizeof(*peer)) == 0) {
43 atomic_inc(&c->c_refcount);
48 list_for_each_safe(tmp, pos, &conn_unused_list) {
49 c = list_entry(tmp, struct ptlrpc_connection, c_link);
50 if (memcmp(peer, &c->c_peer, sizeof(*peer)) == 0) {
51 atomic_inc(&c->c_refcount);
53 list_add(&c->c_link, &conn_list);
58 /* FIXME: this should be a slab once we can validate slab addresses
60 OBD_ALLOC(c, sizeof(*c));
64 c->c_level = LUSTRE_CONN_NEW;
70 atomic_set(&c->c_refcount, 1);
71 spin_lock_init(&c->c_lock);
73 memcpy(&c->c_peer, peer, sizeof(c->c_peer));
74 list_add(&c->c_link, &conn_list);
78 spin_unlock(&conn_lock);
82 int ptlrpc_put_connection(struct ptlrpc_connection *c)
87 if (atomic_dec_and_test(&c->c_refcount)) {
88 spin_lock(&conn_lock);
90 list_add(&c->c_link, &conn_unused_list);
91 spin_unlock(&conn_lock);
98 struct ptlrpc_connection *ptlrpc_connection_addref(struct ptlrpc_connection *c)
101 atomic_inc(&c->c_refcount);
105 void ptlrpc_init_connection(void)
107 INIT_LIST_HEAD(&conn_list);
108 INIT_LIST_HEAD(&conn_unused_list);
109 conn_lock = SPIN_LOCK_UNLOCKED;
112 void ptlrpc_cleanup_connection(void)
114 struct list_head *tmp, *pos;
115 struct ptlrpc_connection *c;
117 spin_lock(&conn_lock);
118 list_for_each_safe(tmp, pos, &conn_unused_list) {
119 c = list_entry(tmp, struct ptlrpc_connection, c_link);
120 list_del(&c->c_link);
121 OBD_FREE(c, sizeof(*c));
123 list_for_each_safe(tmp, pos, &conn_list) {
124 c = list_entry(tmp, struct ptlrpc_connection, c_link);
125 CERROR("Connection %p has refcount %d at cleanup (nid=%lu)!\n",
126 c, atomic_read(&c->c_refcount),
127 (unsigned long)c->c_peer.peer_nid);
128 list_del(&c->c_link);
129 OBD_FREE(c, sizeof(*c));
131 spin_unlock(&conn_lock);