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27 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
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37 #define DEBUG_SUBSYSTEM S_LOG
39 #include "../include/obd_class.h"
40 #include "../include/lustre_log.h"
41 #include "llog_internal.h"
43 /* helper functions for calling the llog obd methods */
44 static struct llog_ctxt *llog_new_ctxt(struct obd_device *obd)
46 struct llog_ctxt *ctxt;
48 ctxt = kzalloc(sizeof(*ctxt), GFP_NOFS);
53 atomic_set(&ctxt->loc_refcount, 1);
58 static void llog_ctxt_destroy(struct llog_ctxt *ctxt)
61 class_export_put(ctxt->loc_exp);
65 class_import_put(ctxt->loc_imp);
71 int __llog_ctxt_put(const struct lu_env *env, struct llog_ctxt *ctxt)
73 struct obd_llog_group *olg = ctxt->loc_olg;
74 struct obd_device *obd;
77 spin_lock(&olg->olg_lock);
78 if (!atomic_dec_and_test(&ctxt->loc_refcount)) {
79 spin_unlock(&olg->olg_lock);
82 olg->olg_ctxts[ctxt->loc_idx] = NULL;
83 spin_unlock(&olg->olg_lock);
86 spin_lock(&obd->obd_dev_lock);
87 /* sync with llog ctxt user thread */
88 spin_unlock(&obd->obd_dev_lock);
90 /* obd->obd_starting is needed for the case of cleanup
91 * in error case while obd is starting up. */
92 LASSERTF(obd->obd_starting == 1 ||
93 obd->obd_stopping == 1 || obd->obd_set_up == 0,
94 "wrong obd state: %d/%d/%d\n", !!obd->obd_starting,
95 !!obd->obd_stopping, !!obd->obd_set_up);
97 /* cleanup the llog ctxt here */
98 if (CTXTP(ctxt, cleanup))
99 rc = CTXTP(ctxt, cleanup)(env, ctxt);
101 llog_ctxt_destroy(ctxt);
102 wake_up(&olg->olg_waitq);
105 EXPORT_SYMBOL(__llog_ctxt_put);
107 int llog_cleanup(const struct lu_env *env, struct llog_ctxt *ctxt)
109 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
110 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(olg->olg_waitq,
138 llog_group_ctxt_null(olg, idx), &lwi);
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;
151 if (index < 0 || index >= LLOG_MAX_CTXTS)
154 LASSERT(olg != NULL);
156 ctxt = llog_new_ctxt(obd);
162 ctxt->loc_idx = index;
163 ctxt->loc_logops = op;
164 mutex_init(&ctxt->loc_mutex);
165 ctxt->loc_exp = class_export_get(disk_obd->obd_self_export);
166 ctxt->loc_flags = LLOG_CTXT_FLAG_UNINITIALIZED;
168 rc = llog_group_set_ctxt(olg, ctxt, index);
170 llog_ctxt_destroy(ctxt);
172 ctxt = llog_group_get_ctxt(olg, index);
175 * mds_lov_update_desc() might call here multiple
176 * times. So if the llog is already set up then
177 * don't to do it again.
179 CDEBUG(D_CONFIG, "obd %s ctxt %d already set up\n",
180 obd->obd_name, index);
181 LASSERT(ctxt->loc_olg == olg);
182 LASSERT(ctxt->loc_obd == obd);
183 LASSERT(ctxt->loc_exp == disk_obd->obd_self_export);
184 LASSERT(ctxt->loc_logops == op);
193 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LLOG_SETUP))
196 rc = op->lop_setup(env, obd, olg, index, disk_obd);
200 CERROR("%s: ctxt %d lop_setup=%p failed: rc = %d\n",
201 obd->obd_name, index, op->lop_setup, rc);
202 llog_group_clear_ctxt(olg, index);
203 llog_ctxt_destroy(ctxt);
205 CDEBUG(D_CONFIG, "obd %s ctxt %d is initialized\n",
206 obd->obd_name, index);
207 ctxt->loc_flags &= ~LLOG_CTXT_FLAG_UNINITIALIZED;
212 EXPORT_SYMBOL(llog_setup);
214 /* context key constructor/destructor: llog_key_init, llog_key_fini */
215 LU_KEY_INIT_FINI(llog, struct llog_thread_info);
216 /* context key: llog_thread_key */
217 LU_CONTEXT_KEY_DEFINE(llog, LCT_MD_THREAD | LCT_MG_THREAD | LCT_LOCAL);
218 LU_KEY_INIT_GENERIC(llog);
219 EXPORT_SYMBOL(llog_thread_key);
221 int llog_info_init(void)
223 llog_key_init_generic(&llog_thread_key, NULL);
224 lu_context_key_register(&llog_thread_key);
228 void llog_info_fini(void)
230 lu_context_key_degister(&llog_thread_key);