4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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8 * as published by the Free Software Foundation.
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).
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.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2016, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/mdd/mdd_trans.c
34 * Lustre Metadata Server (mdd) routines
36 * Author: Wang Di <wangdi@clusterfs.com>
39 #define DEBUG_SUBSYSTEM S_MDS
41 #include <obd_class.h>
42 #include <lprocfs_status.h>
43 #include <lustre_mds.h>
44 #include <lustre_barrier.h>
46 #include "mdd_internal.h"
48 struct thandle *mdd_trans_create(const struct lu_env *env,
49 struct mdd_device *mdd)
51 /* If blocked by the write barrier, then return "-EINPROGRESS"
52 * to the caller. Usually, such error will be forwarded to the
53 * client, and the expected behaviour is to re-try such modify
54 * RPC some time later until the barrier is thawed or expired. */
55 if (unlikely(!barrier_entry(mdd->mdd_bottom)))
56 return ERR_PTR(-EINPROGRESS);
58 return mdd_child_ops(mdd)->dt_trans_create(env, mdd->mdd_child);
61 int mdd_trans_start(const struct lu_env *env, struct mdd_device *mdd,
64 return mdd_child_ops(mdd)->dt_trans_start(env, mdd->mdd_child, th);
67 int mdd_trans_stop(const struct lu_env *env, struct mdd_device *mdd,
68 int result, struct thandle *handle)
72 handle->th_result = result;
73 rc = mdd_child_ops(mdd)->dt_trans_stop(env, mdd->mdd_child, handle);
74 barrier_exit(mdd->mdd_bottom);
76 /* if operation failed, return \a result, otherwise return status of