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/obd_class.h>
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 /* If UUID is NULL, c->c_remote_uuid must be all zeroes
34 * If UUID is non-NULL, c->c_remote_uuid must match. */
35 static int match_connection_uuid(struct ptlrpc_connection *c, obd_uuid_t uuid)
37 obd_uuid_t zero_uuid = {0};
40 return memcmp(c->c_remote_uuid, uuid, sizeof(uuid));
42 return memcmp(c->c_remote_uuid, zero_uuid, sizeof(zero_uuid));
45 struct ptlrpc_connection *ptlrpc_get_connection(struct lustre_peer *peer,
48 struct list_head *tmp, *pos;
49 struct ptlrpc_connection *c;
52 CDEBUG(D_INFO, "peer is %08x %08lx %08lx\n",
53 peer->peer_nid, peer->peer_ni.nal_idx, peer->peer_ni.handle_idx);
55 spin_lock(&conn_lock);
56 list_for_each(tmp, &conn_list) {
57 c = list_entry(tmp, struct ptlrpc_connection, c_link);
58 if (memcmp(peer, &c->c_peer, sizeof(*peer)) == 0 &&
59 !match_connection_uuid(c, uuid)) {
60 ptlrpc_connection_addref(c);
65 list_for_each_safe(tmp, pos, &conn_unused_list) {
66 c = list_entry(tmp, struct ptlrpc_connection, c_link);
67 if (memcmp(peer, &c->c_peer, sizeof(*peer)) == 0 &&
68 !match_connection_uuid(c, uuid)) {
69 ptlrpc_connection_addref(c);
71 list_add(&c->c_link, &conn_list);
76 /* FIXME: this should be a slab once we can validate slab addresses
78 OBD_ALLOC(c, sizeof(*c));
82 c->c_level = LUSTRE_CONN_NEW;
88 strcpy(c->c_remote_uuid, uuid);
89 INIT_LIST_HEAD(&c->c_imports);
90 INIT_LIST_HEAD(&c->c_exports);
91 INIT_LIST_HEAD(&c->c_sb_chain);
92 INIT_LIST_HEAD(&c->c_recovd_data.rd_managed_chain);
93 INIT_LIST_HEAD(&c->c_delayed_head);
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)
113 CERROR("NULL connection\n");
117 CDEBUG(D_INFO, "connection=%p refcount %d\n",
118 c, atomic_read(&c->c_refcount) - 1);
119 if (atomic_dec_and_test(&c->c_refcount)) {
120 recovd_conn_unmanage(c);
121 spin_lock(&conn_lock);
122 list_del(&c->c_link);
123 list_add(&c->c_link, &conn_unused_list);
124 spin_unlock(&conn_lock);
127 if (atomic_read(&c->c_refcount) < 0)
128 CERROR("connection %p refcount %d!\n",
129 c, atomic_read(&c->c_refcount));
134 struct ptlrpc_connection *ptlrpc_connection_addref(struct ptlrpc_connection *c)
137 CDEBUG(D_INFO, "connection=%p refcount %d\n",
138 c, atomic_read(&c->c_refcount) + 1);
139 atomic_inc(&c->c_refcount);
143 void ptlrpc_init_connection(void)
145 INIT_LIST_HEAD(&conn_list);
146 INIT_LIST_HEAD(&conn_unused_list);
147 conn_lock = SPIN_LOCK_UNLOCKED;
150 void ptlrpc_cleanup_connection(void)
152 struct list_head *tmp, *pos;
153 struct ptlrpc_connection *c;
155 spin_lock(&conn_lock);
156 list_for_each_safe(tmp, pos, &conn_unused_list) {
157 c = list_entry(tmp, struct ptlrpc_connection, c_link);
158 list_del(&c->c_link);
159 OBD_FREE(c, sizeof(*c));
161 list_for_each_safe(tmp, pos, &conn_list) {
162 c = list_entry(tmp, struct ptlrpc_connection, c_link);
163 CERROR("Connection %p/%s has refcount %d (nid=%lu)\n",
164 c, c->c_remote_uuid, atomic_read(&c->c_refcount),
165 (unsigned long)c->c_peer.peer_nid);
166 list_del(&c->c_link);
167 OBD_FREE(c, sizeof(*c));
169 spin_unlock(&conn_lock);