diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/ptlrpc/connection.c')
-rw-r--r-- | drivers/staging/lustre/lustre/ptlrpc/connection.c | 234 |
1 files changed, 0 insertions, 234 deletions
diff --git a/drivers/staging/lustre/lustre/ptlrpc/connection.c b/drivers/staging/lustre/lustre/ptlrpc/connection.c deleted file mode 100644 index dfdb4587d49d..000000000000 --- a/drivers/staging/lustre/lustre/ptlrpc/connection.c +++ /dev/null @@ -1,234 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * GPL HEADER START - * - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 only, - * as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License version 2 for more details (a copy is included - * in the LICENSE file that accompanied this code). - * - * You should have received a copy of the GNU General Public License - * version 2 along with this program; If not, see - * http://www.gnu.org/licenses/gpl-2.0.html - * - * GPL HEADER END - */ -/* - * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. - * Use is subject to license terms. - * - * Copyright (c) 2011, Intel Corporation. - */ -/* - * This file is part of Lustre, http://www.lustre.org/ - * Lustre is a trademark of Sun Microsystems, Inc. - */ - -#define DEBUG_SUBSYSTEM S_RPC -#include <obd_support.h> -#include <obd_class.h> -#include <lustre_net.h> - -#include "ptlrpc_internal.h" - -static struct cfs_hash *conn_hash; -static struct cfs_hash_ops conn_hash_ops; - -struct ptlrpc_connection * -ptlrpc_connection_get(struct lnet_process_id peer, lnet_nid_t self, - struct obd_uuid *uuid) -{ - struct ptlrpc_connection *conn, *conn2; - - conn = cfs_hash_lookup(conn_hash, &peer); - if (conn) - goto out; - - conn = kzalloc(sizeof(*conn), GFP_NOFS); - if (!conn) - return NULL; - - conn->c_peer = peer; - conn->c_self = self; - INIT_HLIST_NODE(&conn->c_hash); - atomic_set(&conn->c_refcount, 1); - if (uuid) - obd_str2uuid(&conn->c_remote_uuid, uuid->uuid); - - /* - * Add the newly created conn to the hash, on key collision we - * lost a racing addition and must destroy our newly allocated - * connection. The object which exists in the has will be - * returned and may be compared against out object. - */ - /* In the function below, .hs_keycmp resolves to - * conn_keycmp() - */ - /* coverity[overrun-buffer-val] */ - conn2 = cfs_hash_findadd_unique(conn_hash, &peer, &conn->c_hash); - if (conn != conn2) { - kfree(conn); - conn = conn2; - } -out: - CDEBUG(D_INFO, "conn=%p refcount %d to %s\n", - conn, atomic_read(&conn->c_refcount), - libcfs_nid2str(conn->c_peer.nid)); - return conn; -} - -int ptlrpc_connection_put(struct ptlrpc_connection *conn) -{ - int rc = 0; - - if (!conn) - return rc; - - LASSERT(atomic_read(&conn->c_refcount) > 1); - - /* - * We do not remove connection from hashtable and - * do not free it even if last caller released ref, - * as we want to have it cached for the case it is - * needed again. - * - * Deallocating it and later creating new connection - * again would be wastful. This way we also avoid - * expensive locking to protect things from get/put - * race when found cached connection is freed by - * ptlrpc_connection_put(). - * - * It will be freed later in module unload time, - * when ptlrpc_connection_fini()->lh_exit->conn_exit() - * path is called. - */ - if (atomic_dec_return(&conn->c_refcount) == 1) - rc = 1; - - CDEBUG(D_INFO, "PUT conn=%p refcount %d to %s\n", - conn, atomic_read(&conn->c_refcount), - libcfs_nid2str(conn->c_peer.nid)); - - return rc; -} - -struct ptlrpc_connection * -ptlrpc_connection_addref(struct ptlrpc_connection *conn) -{ - atomic_inc(&conn->c_refcount); - CDEBUG(D_INFO, "conn=%p refcount %d to %s\n", - conn, atomic_read(&conn->c_refcount), - libcfs_nid2str(conn->c_peer.nid)); - - return conn; -} - -int ptlrpc_connection_init(void) -{ - conn_hash = cfs_hash_create("CONN_HASH", - HASH_CONN_CUR_BITS, - HASH_CONN_MAX_BITS, - HASH_CONN_BKT_BITS, 0, - CFS_HASH_MIN_THETA, - CFS_HASH_MAX_THETA, - &conn_hash_ops, CFS_HASH_DEFAULT); - if (!conn_hash) - return -ENOMEM; - - return 0; -} - -void ptlrpc_connection_fini(void) -{ - cfs_hash_putref(conn_hash); -} - -/* - * Hash operations for net_peer<->connection - */ -static unsigned int -conn_hashfn(struct cfs_hash *hs, const void *key, unsigned int mask) -{ - return cfs_hash_djb2_hash(key, sizeof(struct lnet_process_id), mask); -} - -static int -conn_keycmp(const void *key, struct hlist_node *hnode) -{ - struct ptlrpc_connection *conn; - const struct lnet_process_id *conn_key; - - LASSERT(key); - conn_key = key; - conn = hlist_entry(hnode, struct ptlrpc_connection, c_hash); - - return conn_key->nid == conn->c_peer.nid && - conn_key->pid == conn->c_peer.pid; -} - -static void * -conn_key(struct hlist_node *hnode) -{ - struct ptlrpc_connection *conn; - - conn = hlist_entry(hnode, struct ptlrpc_connection, c_hash); - return &conn->c_peer; -} - -static void * -conn_object(struct hlist_node *hnode) -{ - return hlist_entry(hnode, struct ptlrpc_connection, c_hash); -} - -static void -conn_get(struct cfs_hash *hs, struct hlist_node *hnode) -{ - struct ptlrpc_connection *conn; - - conn = hlist_entry(hnode, struct ptlrpc_connection, c_hash); - atomic_inc(&conn->c_refcount); -} - -static void -conn_put_locked(struct cfs_hash *hs, struct hlist_node *hnode) -{ - struct ptlrpc_connection *conn; - - conn = hlist_entry(hnode, struct ptlrpc_connection, c_hash); - atomic_dec(&conn->c_refcount); -} - -static void -conn_exit(struct cfs_hash *hs, struct hlist_node *hnode) -{ - struct ptlrpc_connection *conn; - - conn = hlist_entry(hnode, struct ptlrpc_connection, c_hash); - /* - * Nothing should be left. Connection user put it and - * connection also was deleted from table by this time - * so we should have 0 refs. - */ - LASSERTF(atomic_read(&conn->c_refcount) == 0, - "Busy connection with %d refs\n", - atomic_read(&conn->c_refcount)); - kfree(conn); -} - -static struct cfs_hash_ops conn_hash_ops = { - .hs_hash = conn_hashfn, - .hs_keycmp = conn_keycmp, - .hs_key = conn_key, - .hs_object = conn_object, - .hs_get = conn_get, - .hs_put_locked = conn_put_locked, - .hs_exit = conn_exit, -}; |