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10 * This program is distributed in the hope that it will be useful, but
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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).
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17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2015, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
33 #define DEBUG_SUBSYSTEM S_LOG
35 #include <obd_class.h>
36 #include <lustre_log.h>
37 #include "llog_internal.h"
39 /* helper functions for calling the llog obd methods */
40 static struct llog_ctxt *llog_new_ctxt(struct obd_device *obd)
42 struct llog_ctxt *ctxt;
44 ctxt = kzalloc(sizeof(*ctxt), GFP_NOFS);
49 atomic_set(&ctxt->loc_refcount, 1);
54 static void llog_ctxt_destroy(struct llog_ctxt *ctxt)
57 class_export_put(ctxt->loc_exp);
61 class_import_put(ctxt->loc_imp);
67 int __llog_ctxt_put(const struct lu_env *env, struct llog_ctxt *ctxt)
69 struct obd_llog_group *olg = ctxt->loc_olg;
70 struct obd_device *obd;
73 spin_lock(&olg->olg_lock);
74 if (!atomic_dec_and_test(&ctxt->loc_refcount)) {
75 spin_unlock(&olg->olg_lock);
78 olg->olg_ctxts[ctxt->loc_idx] = NULL;
79 spin_unlock(&olg->olg_lock);
82 spin_lock(&obd->obd_dev_lock);
83 /* sync with llog ctxt user thread */
84 spin_unlock(&obd->obd_dev_lock);
86 /* obd->obd_starting is needed for the case of cleanup
87 * in error case while obd is starting up.
89 LASSERTF(obd->obd_starting == 1 ||
90 obd->obd_stopping == 1 || obd->obd_set_up == 0,
91 "wrong obd state: %d/%d/%d\n", !!obd->obd_starting,
92 !!obd->obd_stopping, !!obd->obd_set_up);
94 /* cleanup the llog ctxt here */
95 if (CTXTP(ctxt, cleanup))
96 rc = CTXTP(ctxt, cleanup)(env, ctxt);
98 llog_ctxt_destroy(ctxt);
99 wake_up(&olg->olg_waitq);
102 EXPORT_SYMBOL(__llog_ctxt_put);
104 int llog_cleanup(const struct lu_env *env, struct llog_ctxt *ctxt)
106 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
107 struct obd_llog_group *olg;
112 LASSERT(olg != LP_POISON);
117 * Banlance the ctxt get when calling llog_cleanup()
119 LASSERT(atomic_read(&ctxt->loc_refcount) < LI_POISON);
120 LASSERT(atomic_read(&ctxt->loc_refcount) > 1);
124 * Try to free the ctxt.
126 rc = __llog_ctxt_put(env, ctxt);
128 CERROR("Error %d while cleaning up ctxt %p\n",
131 l_wait_event(olg->olg_waitq,
132 llog_group_ctxt_null(olg, idx), &lwi);
136 EXPORT_SYMBOL(llog_cleanup);
138 int llog_setup(const struct lu_env *env, struct obd_device *obd,
139 struct obd_llog_group *olg, int index,
140 struct obd_device *disk_obd, struct llog_operations *op)
142 struct llog_ctxt *ctxt;
145 if (index < 0 || index >= LLOG_MAX_CTXTS)
150 ctxt = llog_new_ctxt(obd);
156 ctxt->loc_idx = index;
157 ctxt->loc_logops = op;
158 mutex_init(&ctxt->loc_mutex);
159 ctxt->loc_exp = class_export_get(disk_obd->obd_self_export);
160 ctxt->loc_flags = LLOG_CTXT_FLAG_UNINITIALIZED;
161 ctxt->loc_chunk_size = LLOG_MIN_CHUNK_SIZE;
163 rc = llog_group_set_ctxt(olg, ctxt, index);
165 llog_ctxt_destroy(ctxt);
167 ctxt = llog_group_get_ctxt(olg, index);
170 * mds_lov_update_desc() might call here multiple
171 * times. So if the llog is already set up then
172 * don't to do it again.
174 CDEBUG(D_CONFIG, "obd %s ctxt %d already set up\n",
175 obd->obd_name, index);
176 LASSERT(ctxt->loc_olg == olg);
177 LASSERT(ctxt->loc_obd == obd);
178 LASSERT(ctxt->loc_exp == disk_obd->obd_self_export);
179 LASSERT(ctxt->loc_logops == op);
188 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LLOG_SETUP))
191 rc = op->lop_setup(env, obd, olg, index, disk_obd);
195 CERROR("%s: ctxt %d lop_setup=%p failed: rc = %d\n",
196 obd->obd_name, index, op->lop_setup, rc);
197 llog_group_clear_ctxt(olg, index);
198 llog_ctxt_destroy(ctxt);
200 CDEBUG(D_CONFIG, "obd %s ctxt %d is initialized\n",
201 obd->obd_name, index);
202 ctxt->loc_flags &= ~LLOG_CTXT_FLAG_UNINITIALIZED;
207 EXPORT_SYMBOL(llog_setup);
209 /* context key constructor/destructor: llog_key_init, llog_key_fini */
210 LU_KEY_INIT_FINI(llog, struct llog_thread_info);
211 /* context key: llog_thread_key */
212 LU_CONTEXT_KEY_DEFINE(llog, LCT_MD_THREAD | LCT_MG_THREAD | LCT_LOCAL);
213 LU_KEY_INIT_GENERIC(llog);
215 int llog_info_init(void)
217 llog_key_init_generic(&llog_thread_key, NULL);
218 lu_context_key_register(&llog_thread_key);
222 void llog_info_fini(void)
224 lu_context_key_degister(&llog_thread_key);