drivers/staging/lustre/lustre/ptlrpc/llog_net.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/ptlrpc/llog_net.c
  37  *
  38  * OST<->MDS recovery logging infrastructure.
  39  *
  40  * Invariants in implementation:
  41  * - we do not share logs among different OST<->MDS connections, so that
  42  *   if an OST or MDS fails it need only look at log(s) relevant to itself
  43  *
  44  * Author: Andreas Dilger <adilger@clusterfs.com>
  45  */
  46
  47 #define DEBUG_SUBSYSTEM S_LOG
  48
  49 #include <linux/libcfs/libcfs.h>
  50
  51 #include <obd_class.h>
  52 #include <lustre_log.h>
  53 #include <linux/list.h>
  54 #include <lvfs.h>
  55 #include <lustre_fsfilt.h>
  56
  57 int llog_initiator_connect(struct llog_ctxt *ctxt)
  58 {
  59         struct obd_import *new_imp;
  60
  61         LASSERT(ctxt);
  62         new_imp = ctxt->loc_obd->u.cli.cl_import;
  63         LASSERTF(ctxt->loc_imp == NULL || ctxt->loc_imp == new_imp,
  64                  "%p - %p\n", ctxt->loc_imp, new_imp);
  65         mutex_lock(&ctxt->loc_mutex);
  66         if (ctxt->loc_imp != new_imp) {
  67                 if (ctxt->loc_imp)
  68                         class_import_put(ctxt->loc_imp);
  69                 ctxt->loc_imp = class_import_get(new_imp);
  70         }
  71         mutex_unlock(&ctxt->loc_mutex);
  72         return 0;
  73 }
  74 EXPORT_SYMBOL(llog_initiator_connect);