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.
23 #define DEBUG_SUBSYSTEM S_RPC
25 #include <linux/obd_support.h>
26 #include <linux/lustre_net.h>
28 static spinlock_t conn_lock;
29 static struct list_head conn_list;
30 static struct list_head conn_unused_list;
32 /* If UUID is NULL, c->c_remote_uuid must be all zeroes
33 * If UUID is non-NULL, c->c_remote_uuid must match. */
34 static int match_connection_uuid(struct ptlrpc_connection *c, obd_uuid_t uuid)
36 obd_uuid_t zero_uuid = {0};
39 return memcmp(c->c_remote_uuid, uuid, sizeof(uuid));
41 return memcmp(c->c_remote_uuid, zero_uuid, sizeof(zero_uuid));
44 struct ptlrpc_connection *ptlrpc_get_connection(struct lustre_peer *peer,
47 struct list_head *tmp, *pos;
48 struct ptlrpc_connection *c;
51 CDEBUG(D_INFO, "peer is %08x %08lx %08lx\n",
52 peer->peer_nid, peer->peer_ni.nal_idx, peer->peer_ni.handle_idx);
54 spin_lock(&conn_lock);
55 list_for_each(tmp, &conn_list) {
56 c = list_entry(tmp, struct ptlrpc_connection, c_link);
57 if (memcmp(peer, &c->c_peer, sizeof(*peer)) == 0 &&
58 !match_connection_uuid(c, uuid)) {
59 ptlrpc_connection_addref(c);
64 list_for_each_safe(tmp, pos, &conn_unused_list) {
65 c = list_entry(tmp, struct ptlrpc_connection, c_link);
66 if (memcmp(peer, &c->c_peer, sizeof(*peer)) == 0 &&
67 !match_connection_uuid(c, uuid)) {
68 ptlrpc_connection_addref(c);
70 list_add(&c->c_link, &conn_list);
75 /* FIXME: this should be a slab once we can validate slab addresses
77 OBD_ALLOC(c, sizeof(*c));
81 c->c_level = LUSTRE_CONN_NEW;
88 strcpy(c->c_remote_uuid, uuid);
89 INIT_LIST_HEAD(&c->c_delayed_head);
90 INIT_LIST_HEAD(&c->c_sending_head);
91 INIT_LIST_HEAD(&c->c_dying_head);
92 INIT_LIST_HEAD(&c->c_imports);
93 INIT_LIST_HEAD(&c->c_exports);
94 atomic_set(&c->c_refcount, 0);
95 ptlrpc_connection_addref(c);
96 spin_lock_init(&c->c_lock);
98 memcpy(&c->c_peer, peer, sizeof(c->c_peer));
99 list_add(&c->c_link, &conn_list);
103 spin_unlock(&conn_lock);
107 int ptlrpc_put_connection(struct ptlrpc_connection *c)
112 CDEBUG(D_INFO, "connection=%p refcount %d\n",
113 c, atomic_read(&c->c_refcount) - 1);
114 if (atomic_dec_and_test(&c->c_refcount)) {
115 spin_lock(&conn_lock);
116 list_del(&c->c_link);
117 list_add(&c->c_link, &conn_unused_list);
118 spin_unlock(&conn_lock);
121 if (atomic_read(&c->c_refcount) < 0)
122 CERROR("connection %p refcount %d!\n",
123 c, atomic_read(&c->c_refcount));
128 struct ptlrpc_connection *ptlrpc_connection_addref(struct ptlrpc_connection *c)
131 CDEBUG(D_INFO, "connection=%p refcount %d\n",
132 c, atomic_read(&c->c_refcount) + 1);
133 atomic_inc(&c->c_refcount);
137 void ptlrpc_init_connection(void)
139 INIT_LIST_HEAD(&conn_list);
140 INIT_LIST_HEAD(&conn_unused_list);
141 conn_lock = SPIN_LOCK_UNLOCKED;
144 void ptlrpc_cleanup_connection(void)
146 struct list_head *tmp, *pos;
147 struct ptlrpc_connection *c;
149 spin_lock(&conn_lock);
150 list_for_each_safe(tmp, pos, &conn_unused_list) {
151 c = list_entry(tmp, struct ptlrpc_connection, c_link);
152 list_del(&c->c_link);
153 OBD_FREE(c, sizeof(*c));
155 list_for_each_safe(tmp, pos, &conn_list) {
156 c = list_entry(tmp, struct ptlrpc_connection, c_link);
157 CERROR("Connection %p has refcount %d at cleanup (nid=%lu)!\n",
158 c, atomic_read(&c->c_refcount),
159 (unsigned long)c->c_peer.peer_nid);
160 list_del(&c->c_link);
161 OBD_FREE(c, sizeof(*c));
163 spin_unlock(&conn_lock);