230 lines
5.8 KiB
C
230 lines
5.8 KiB
C
/*
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* GPL HEADER START
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 only,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License version 2 for more details (a copy is included
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* in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; If not, see
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* http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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* GPL HEADER END
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*/
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/*
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* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
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* Use is subject to license terms.
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*
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* Copyright (c) 2012, 2015, Intel Corporation.
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*/
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/*
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* This file is part of Lustre, http://www.lustre.org/
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* Lustre is a trademark of Sun Microsystems, Inc.
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*/
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#define DEBUG_SUBSYSTEM S_LOG
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#include "../include/obd_class.h"
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#include "../include/lustre_log.h"
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#include "llog_internal.h"
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/* helper functions for calling the llog obd methods */
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static struct llog_ctxt *llog_new_ctxt(struct obd_device *obd)
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{
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struct llog_ctxt *ctxt;
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ctxt = kzalloc(sizeof(*ctxt), GFP_NOFS);
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if (!ctxt)
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return NULL;
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ctxt->loc_obd = obd;
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atomic_set(&ctxt->loc_refcount, 1);
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return ctxt;
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}
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static void llog_ctxt_destroy(struct llog_ctxt *ctxt)
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{
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if (ctxt->loc_exp) {
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class_export_put(ctxt->loc_exp);
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ctxt->loc_exp = NULL;
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}
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if (ctxt->loc_imp) {
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class_import_put(ctxt->loc_imp);
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ctxt->loc_imp = NULL;
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}
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kfree(ctxt);
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}
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int __llog_ctxt_put(const struct lu_env *env, struct llog_ctxt *ctxt)
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{
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struct obd_llog_group *olg = ctxt->loc_olg;
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struct obd_device *obd;
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int rc = 0;
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spin_lock(&olg->olg_lock);
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if (!atomic_dec_and_test(&ctxt->loc_refcount)) {
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spin_unlock(&olg->olg_lock);
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return rc;
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}
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olg->olg_ctxts[ctxt->loc_idx] = NULL;
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spin_unlock(&olg->olg_lock);
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obd = ctxt->loc_obd;
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spin_lock(&obd->obd_dev_lock);
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/* sync with llog ctxt user thread */
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spin_unlock(&obd->obd_dev_lock);
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/* obd->obd_starting is needed for the case of cleanup
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* in error case while obd is starting up.
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*/
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LASSERTF(obd->obd_starting == 1 ||
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obd->obd_stopping == 1 || obd->obd_set_up == 0,
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"wrong obd state: %d/%d/%d\n", !!obd->obd_starting,
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!!obd->obd_stopping, !!obd->obd_set_up);
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/* cleanup the llog ctxt here */
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if (CTXTP(ctxt, cleanup))
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rc = CTXTP(ctxt, cleanup)(env, ctxt);
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llog_ctxt_destroy(ctxt);
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wake_up(&olg->olg_waitq);
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return rc;
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}
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EXPORT_SYMBOL(__llog_ctxt_put);
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int llog_cleanup(const struct lu_env *env, struct llog_ctxt *ctxt)
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{
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struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
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struct obd_llog_group *olg;
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int rc, idx;
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olg = ctxt->loc_olg;
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LASSERT(olg);
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LASSERT(olg != LP_POISON);
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idx = ctxt->loc_idx;
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/*
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* Banlance the ctxt get when calling llog_cleanup()
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*/
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LASSERT(atomic_read(&ctxt->loc_refcount) < LI_POISON);
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LASSERT(atomic_read(&ctxt->loc_refcount) > 1);
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llog_ctxt_put(ctxt);
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/*
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* Try to free the ctxt.
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*/
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rc = __llog_ctxt_put(env, ctxt);
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if (rc)
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CERROR("Error %d while cleaning up ctxt %p\n",
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rc, ctxt);
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l_wait_event(olg->olg_waitq,
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llog_group_ctxt_null(olg, idx), &lwi);
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return rc;
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}
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EXPORT_SYMBOL(llog_cleanup);
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int llog_setup(const struct lu_env *env, struct obd_device *obd,
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struct obd_llog_group *olg, int index,
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struct obd_device *disk_obd, struct llog_operations *op)
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{
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struct llog_ctxt *ctxt;
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int rc = 0;
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if (index < 0 || index >= LLOG_MAX_CTXTS)
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return -EINVAL;
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LASSERT(olg);
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ctxt = llog_new_ctxt(obd);
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if (!ctxt)
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return -ENOMEM;
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ctxt->loc_obd = obd;
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ctxt->loc_olg = olg;
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ctxt->loc_idx = index;
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ctxt->loc_logops = op;
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mutex_init(&ctxt->loc_mutex);
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ctxt->loc_exp = class_export_get(disk_obd->obd_self_export);
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ctxt->loc_flags = LLOG_CTXT_FLAG_UNINITIALIZED;
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rc = llog_group_set_ctxt(olg, ctxt, index);
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if (rc) {
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llog_ctxt_destroy(ctxt);
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if (rc == -EEXIST) {
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ctxt = llog_group_get_ctxt(olg, index);
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if (ctxt) {
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/*
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* mds_lov_update_desc() might call here multiple
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* times. So if the llog is already set up then
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* don't to do it again.
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*/
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CDEBUG(D_CONFIG, "obd %s ctxt %d already set up\n",
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obd->obd_name, index);
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LASSERT(ctxt->loc_olg == olg);
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LASSERT(ctxt->loc_obd == obd);
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LASSERT(ctxt->loc_exp == disk_obd->obd_self_export);
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LASSERT(ctxt->loc_logops == op);
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llog_ctxt_put(ctxt);
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}
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rc = 0;
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}
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return rc;
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}
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if (op->lop_setup) {
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if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LLOG_SETUP))
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rc = -EOPNOTSUPP;
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else
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rc = op->lop_setup(env, obd, olg, index, disk_obd);
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}
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if (rc) {
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CERROR("%s: ctxt %d lop_setup=%p failed: rc = %d\n",
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obd->obd_name, index, op->lop_setup, rc);
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llog_group_clear_ctxt(olg, index);
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llog_ctxt_destroy(ctxt);
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} else {
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CDEBUG(D_CONFIG, "obd %s ctxt %d is initialized\n",
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obd->obd_name, index);
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ctxt->loc_flags &= ~LLOG_CTXT_FLAG_UNINITIALIZED;
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}
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return rc;
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}
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EXPORT_SYMBOL(llog_setup);
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/* context key constructor/destructor: llog_key_init, llog_key_fini */
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LU_KEY_INIT_FINI(llog, struct llog_thread_info);
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/* context key: llog_thread_key */
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LU_CONTEXT_KEY_DEFINE(llog, LCT_MD_THREAD | LCT_MG_THREAD | LCT_LOCAL);
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LU_KEY_INIT_GENERIC(llog);
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EXPORT_SYMBOL(llog_thread_key);
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int llog_info_init(void)
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{
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llog_key_init_generic(&llog_thread_key, NULL);
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lu_context_key_register(&llog_thread_key);
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return 0;
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}
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void llog_info_fini(void)
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{
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lu_context_key_degister(&llog_thread_key);
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}
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