1 // SPDX-License-Identifier: GPL-2.0
5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 only,
9 * as published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License version 2 for more details (a copy is included
15 * in the LICENSE file that accompanied this code).
17 * You should have received a copy of the GNU General Public License
18 * version 2 along with this program; If not, see
19 * http://www.gnu.org/licenses/gpl-2.0.html
24 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
25 * Use is subject to license terms.
27 * Copyright (c) 2012, 2015, Intel Corporation.
30 * This file is part of Lustre, http://www.lustre.org/
31 * Lustre is a trademark of Sun Microsystems, Inc.
34 #define DEBUG_SUBSYSTEM S_LOG
36 #include <obd_class.h>
37 #include <lustre_log.h>
38 #include "llog_internal.h"
40 /* helper functions for calling the llog obd methods */
41 static struct llog_ctxt *llog_new_ctxt(struct obd_device *obd)
43 struct llog_ctxt *ctxt;
45 ctxt = kzalloc(sizeof(*ctxt), GFP_NOFS);
50 atomic_set(&ctxt->loc_refcount, 1);
55 static void llog_ctxt_destroy(struct llog_ctxt *ctxt)
58 class_export_put(ctxt->loc_exp);
62 class_import_put(ctxt->loc_imp);
68 int __llog_ctxt_put(const struct lu_env *env, struct llog_ctxt *ctxt)
70 struct obd_llog_group *olg = ctxt->loc_olg;
71 struct obd_device *obd;
74 spin_lock(&olg->olg_lock);
75 if (!atomic_dec_and_test(&ctxt->loc_refcount)) {
76 spin_unlock(&olg->olg_lock);
79 olg->olg_ctxts[ctxt->loc_idx] = NULL;
80 spin_unlock(&olg->olg_lock);
83 spin_lock(&obd->obd_dev_lock);
84 /* sync with llog ctxt user thread */
85 spin_unlock(&obd->obd_dev_lock);
87 /* obd->obd_starting is needed for the case of cleanup
88 * in error case while obd is starting up.
90 LASSERTF(obd->obd_starting == 1 ||
91 obd->obd_stopping == 1 || obd->obd_set_up == 0,
92 "wrong obd state: %d/%d/%d\n", !!obd->obd_starting,
93 !!obd->obd_stopping, !!obd->obd_set_up);
95 /* cleanup the llog ctxt here */
96 if (CTXTP(ctxt, cleanup))
97 rc = CTXTP(ctxt, cleanup)(env, ctxt);
99 llog_ctxt_destroy(ctxt);
100 wake_up(&olg->olg_waitq);
103 EXPORT_SYMBOL(__llog_ctxt_put);
105 int llog_cleanup(const struct lu_env *env, struct llog_ctxt *ctxt)
107 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
108 struct obd_llog_group *olg;
113 LASSERT(olg != LP_POISON);
118 * Banlance the ctxt get when calling llog_cleanup()
120 LASSERT(atomic_read(&ctxt->loc_refcount) < LI_POISON);
121 LASSERT(atomic_read(&ctxt->loc_refcount) > 1);
125 * Try to free the ctxt.
127 rc = __llog_ctxt_put(env, ctxt);
129 CERROR("Error %d while cleaning up ctxt %p\n",
132 l_wait_event(olg->olg_waitq,
133 llog_group_ctxt_null(olg, idx), &lwi);
137 EXPORT_SYMBOL(llog_cleanup);
139 int llog_setup(const struct lu_env *env, struct obd_device *obd,
140 struct obd_llog_group *olg, int index,
141 struct obd_device *disk_obd, struct llog_operations *op)
143 struct llog_ctxt *ctxt;
146 if (index < 0 || index >= LLOG_MAX_CTXTS)
151 ctxt = llog_new_ctxt(obd);
157 ctxt->loc_idx = index;
158 ctxt->loc_logops = op;
159 mutex_init(&ctxt->loc_mutex);
160 ctxt->loc_exp = class_export_get(disk_obd->obd_self_export);
161 ctxt->loc_flags = LLOG_CTXT_FLAG_UNINITIALIZED;
162 ctxt->loc_chunk_size = LLOG_MIN_CHUNK_SIZE;
164 rc = llog_group_set_ctxt(olg, ctxt, index);
166 llog_ctxt_destroy(ctxt);
168 ctxt = llog_group_get_ctxt(olg, index);
171 * mds_lov_update_desc() might call here multiple
172 * times. So if the llog is already set up then
173 * don't to do it again.
175 CDEBUG(D_CONFIG, "obd %s ctxt %d already set up\n",
176 obd->obd_name, index);
177 LASSERT(ctxt->loc_olg == olg);
178 LASSERT(ctxt->loc_obd == obd);
179 LASSERT(ctxt->loc_exp == disk_obd->obd_self_export);
180 LASSERT(ctxt->loc_logops == op);
189 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LLOG_SETUP))
192 rc = op->lop_setup(env, obd, olg, index, disk_obd);
196 CERROR("%s: ctxt %d lop_setup=%p failed: rc = %d\n",
197 obd->obd_name, index, op->lop_setup, rc);
198 llog_group_clear_ctxt(olg, index);
199 llog_ctxt_destroy(ctxt);
201 CDEBUG(D_CONFIG, "obd %s ctxt %d is initialized\n",
202 obd->obd_name, index);
203 ctxt->loc_flags &= ~LLOG_CTXT_FLAG_UNINITIALIZED;
208 EXPORT_SYMBOL(llog_setup);
210 /* context key constructor/destructor: llog_key_init, llog_key_fini */
211 LU_KEY_INIT_FINI(llog, struct llog_thread_info);
212 /* context key: llog_thread_key */
213 LU_CONTEXT_KEY_DEFINE(llog, LCT_MD_THREAD | LCT_MG_THREAD | LCT_LOCAL);
214 LU_KEY_INIT_GENERIC(llog);
216 int llog_info_init(void)
218 llog_key_init_generic(&llog_thread_key, NULL);
219 lu_context_key_register(&llog_thread_key);
223 void llog_info_fini(void)
225 lu_context_key_degister(&llog_thread_key);