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27 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
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37 #define DEBUG_SUBSYSTEM S_RPC
38 #include <obd_support.h>
39 #include <obd_class.h>
40 #include <lustre_net.h>
42 #include "ptlrpc_internal.h"
44 static cfs_hash_t
*conn_hash
= NULL
;
45 static cfs_hash_ops_t conn_hash_ops
;
47 struct ptlrpc_connection
*
48 ptlrpc_connection_get(lnet_process_id_t peer
, lnet_nid_t self
,
49 struct obd_uuid
*uuid
)
51 struct ptlrpc_connection
*conn
, *conn2
;
54 conn
= cfs_hash_lookup(conn_hash
, &peer
);
64 INIT_HLIST_NODE(&conn
->c_hash
);
65 atomic_set(&conn
->c_refcount
, 1);
67 obd_str2uuid(&conn
->c_remote_uuid
, uuid
->uuid
);
70 * Add the newly created conn to the hash, on key collision we
71 * lost a racing addition and must destroy our newly allocated
72 * connection. The object which exists in the has will be
73 * returned and may be compared against out object.
75 /* In the function below, .hs_keycmp resolves to
77 /* coverity[overrun-buffer-val] */
78 conn2
= cfs_hash_findadd_unique(conn_hash
, &peer
, &conn
->c_hash
);
85 CDEBUG(D_INFO
, "conn=%p refcount %d to %s\n",
86 conn
, atomic_read(&conn
->c_refcount
),
87 libcfs_nid2str(conn
->c_peer
.nid
));
90 EXPORT_SYMBOL(ptlrpc_connection_get
);
92 int ptlrpc_connection_put(struct ptlrpc_connection
*conn
)
100 LASSERT(atomic_read(&conn
->c_refcount
) > 1);
103 * We do not remove connection from hashtable and
104 * do not free it even if last caller released ref,
105 * as we want to have it cached for the case it is
108 * Deallocating it and later creating new connection
109 * again would be wastful. This way we also avoid
110 * expensive locking to protect things from get/put
111 * race when found cached connection is freed by
112 * ptlrpc_connection_put().
114 * It will be freed later in module unload time,
115 * when ptlrpc_connection_fini()->lh_exit->conn_exit()
118 if (atomic_dec_return(&conn
->c_refcount
) == 1)
121 CDEBUG(D_INFO
, "PUT conn=%p refcount %d to %s\n",
122 conn
, atomic_read(&conn
->c_refcount
),
123 libcfs_nid2str(conn
->c_peer
.nid
));
127 EXPORT_SYMBOL(ptlrpc_connection_put
);
129 struct ptlrpc_connection
*
130 ptlrpc_connection_addref(struct ptlrpc_connection
*conn
)
134 atomic_inc(&conn
->c_refcount
);
135 CDEBUG(D_INFO
, "conn=%p refcount %d to %s\n",
136 conn
, atomic_read(&conn
->c_refcount
),
137 libcfs_nid2str(conn
->c_peer
.nid
));
141 EXPORT_SYMBOL(ptlrpc_connection_addref
);
143 int ptlrpc_connection_init(void)
147 conn_hash
= cfs_hash_create("CONN_HASH",
150 HASH_CONN_BKT_BITS
, 0,
153 &conn_hash_ops
, CFS_HASH_DEFAULT
);
159 EXPORT_SYMBOL(ptlrpc_connection_init
);
161 void ptlrpc_connection_fini(void) {
163 cfs_hash_putref(conn_hash
);
166 EXPORT_SYMBOL(ptlrpc_connection_fini
);
169 * Hash operations for net_peer<->connection
172 conn_hashfn(cfs_hash_t
*hs
, const void *key
, unsigned mask
)
174 return cfs_hash_djb2_hash(key
, sizeof(lnet_process_id_t
), mask
);
178 conn_keycmp(const void *key
, struct hlist_node
*hnode
)
180 struct ptlrpc_connection
*conn
;
181 const lnet_process_id_t
*conn_key
;
183 LASSERT(key
!= NULL
);
184 conn_key
= (lnet_process_id_t
*)key
;
185 conn
= hlist_entry(hnode
, struct ptlrpc_connection
, c_hash
);
187 return conn_key
->nid
== conn
->c_peer
.nid
&&
188 conn_key
->pid
== conn
->c_peer
.pid
;
192 conn_key(struct hlist_node
*hnode
)
194 struct ptlrpc_connection
*conn
;
195 conn
= hlist_entry(hnode
, struct ptlrpc_connection
, c_hash
);
196 return &conn
->c_peer
;
200 conn_object(struct hlist_node
*hnode
)
202 return hlist_entry(hnode
, struct ptlrpc_connection
, c_hash
);
206 conn_get(cfs_hash_t
*hs
, struct hlist_node
*hnode
)
208 struct ptlrpc_connection
*conn
;
210 conn
= hlist_entry(hnode
, struct ptlrpc_connection
, c_hash
);
211 atomic_inc(&conn
->c_refcount
);
215 conn_put_locked(cfs_hash_t
*hs
, struct hlist_node
*hnode
)
217 struct ptlrpc_connection
*conn
;
219 conn
= hlist_entry(hnode
, struct ptlrpc_connection
, c_hash
);
220 atomic_dec(&conn
->c_refcount
);
224 conn_exit(cfs_hash_t
*hs
, struct hlist_node
*hnode
)
226 struct ptlrpc_connection
*conn
;
228 conn
= hlist_entry(hnode
, struct ptlrpc_connection
, c_hash
);
230 * Nothing should be left. Connection user put it and
231 * connection also was deleted from table by this time
232 * so we should have 0 refs.
234 LASSERTF(atomic_read(&conn
->c_refcount
) == 0,
235 "Busy connection with %d refs\n",
236 atomic_read(&conn
->c_refcount
));
240 static cfs_hash_ops_t conn_hash_ops
= {
241 .hs_hash
= conn_hashfn
,
242 .hs_keycmp
= conn_keycmp
,
244 .hs_object
= conn_object
,
246 .hs_put_locked
= conn_put_locked
,
247 .hs_exit
= conn_exit
,