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13 * General Public License version 2 for more details (a copy is included
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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
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;
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);
88 * obd->obd_starting is needed for the case of cleanup
89 * in error case while obd is starting up.
91 LASSERTF(obd->obd_starting == 1 ||
92 obd->obd_stopping == 1 || obd->obd_set_up == 0,
93 "wrong obd state: %d/%d/%d\n", !!obd->obd_starting,
94 !!obd->obd_stopping, !!obd->obd_set_up);
96 /* cleanup the llog ctxt here */
97 if (ctxt->loc_logops->lop_cleanup)
98 rc = ctxt->loc_logops->lop_cleanup(env, ctxt);
100 llog_ctxt_destroy(ctxt);
101 wake_up(&olg->olg_waitq);
104 EXPORT_SYMBOL(__llog_ctxt_put);
106 int llog_cleanup(const struct lu_env *env, struct llog_ctxt *ctxt)
108 struct obd_llog_group *olg;
113 LASSERT(ctxt != NULL);
114 LASSERT(ctxt != LP_POISON);
117 LASSERT(olg != NULL);
118 LASSERT(olg != LP_POISON);
123 * Banlance the ctxt get when calling llog_cleanup()
125 LASSERT(atomic_read(&ctxt->loc_refcount) < LI_POISON);
126 LASSERT(atomic_read(&ctxt->loc_refcount) > 1);
130 * Try to free the ctxt.
132 rc = __llog_ctxt_put(env, ctxt);
134 CERROR("Error %d while cleaning up ctxt %p\n",
137 l_wait_event_abortable(olg->olg_waitq,
138 llog_group_ctxt_null(olg, idx));
142 EXPORT_SYMBOL(llog_cleanup);
144 int llog_setup(const struct lu_env *env, struct obd_device *obd,
145 struct obd_llog_group *olg, int index,
146 struct obd_device *disk_obd, struct llog_operations *op)
148 struct llog_ctxt *ctxt;
153 if (index < 0 || index >= LLOG_MAX_CTXTS)
156 LASSERT(olg != NULL);
158 ctxt = llog_new_ctxt(obd);
164 ctxt->loc_idx = index;
165 ctxt->loc_logops = op;
166 mutex_init(&ctxt->loc_mutex);
167 if (disk_obd != NULL)
168 ctxt->loc_exp = class_export_get(disk_obd->obd_self_export);
170 ctxt->loc_exp = class_export_get(obd->obd_self_export);
172 ctxt->loc_flags = LLOG_CTXT_FLAG_UNINITIALIZED;
173 ctxt->loc_chunk_size = LLOG_MIN_CHUNK_SIZE;
175 rc = llog_group_set_ctxt(olg, ctxt, index);
177 llog_ctxt_destroy(ctxt);
179 ctxt = llog_group_get_ctxt(olg, index);
181 CDEBUG(D_CONFIG, "%s: ctxt %d already set up\n",
182 obd->obd_name, index);
183 LASSERT(ctxt->loc_olg == olg);
184 LASSERT(ctxt->loc_obd == obd);
185 if (disk_obd != NULL)
186 LASSERT(ctxt->loc_exp ==
187 disk_obd->obd_self_export);
189 LASSERT(ctxt->loc_exp ==
190 obd->obd_self_export);
191 LASSERT(ctxt->loc_logops == op);
200 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LLOG_SETUP))
203 rc = op->lop_setup(env, obd, olg, index, disk_obd);
207 CERROR("%s: ctxt %d lop_setup=%p failed: rc = %d\n",
208 obd->obd_name, index, op->lop_setup, rc);
209 llog_group_clear_ctxt(olg, index);
210 llog_ctxt_destroy(ctxt);
212 CDEBUG(D_CONFIG, "obd %s ctxt %d is initialized\n",
213 obd->obd_name, index);
214 ctxt->loc_flags &= ~LLOG_CTXT_FLAG_UNINITIALIZED;
219 EXPORT_SYMBOL(llog_setup);
221 int llog_sync(struct llog_ctxt *ctxt, struct obd_export *exp, int flags)
226 if (ctxt && ctxt->loc_logops->lop_sync)
227 rc = ctxt->loc_logops->lop_sync(ctxt, exp, flags);
231 EXPORT_SYMBOL(llog_sync);
233 /* context key constructor/destructor: llog_key_init, llog_key_fini */
234 LU_KEY_INIT_FINI(llog, struct llog_thread_info);
235 /* context key: llog_thread_key */
236 LU_CONTEXT_KEY_DEFINE(llog, LCT_MD_THREAD | LCT_MG_THREAD | LCT_LOCAL);
237 LU_KEY_INIT_GENERIC(llog);
239 int llog_info_init(void)
241 llog_key_init_generic(&llog_thread_key, NULL);
242 lu_context_key_register(&llog_thread_key);
246 void llog_info_fini(void)
248 lu_context_key_degister(&llog_thread_key);