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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.
93 LASSERTF(obd->obd_starting == 1 ||
94 obd->obd_stopping == 1 || obd->obd_set_up == 0,
95 "wrong obd state: %d/%d/%d\n", !!obd->obd_starting,
96 !!obd->obd_stopping, !!obd->obd_set_up);
98 /* cleanup the llog ctxt here */
99 if (CTXTP(ctxt, cleanup))
100 rc = CTXTP(ctxt, cleanup)(env, ctxt);
102 llog_ctxt_destroy(ctxt);
103 wake_up(&olg->olg_waitq);
106 EXPORT_SYMBOL(__llog_ctxt_put);
108 int llog_cleanup(const struct lu_env *env, struct llog_ctxt *ctxt)
110 struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
111 struct obd_llog_group *olg;
116 LASSERT(olg != LP_POISON);
121 * Banlance the ctxt get when calling llog_cleanup()
123 LASSERT(atomic_read(&ctxt->loc_refcount) < LI_POISON);
124 LASSERT(atomic_read(&ctxt->loc_refcount) > 1);
128 * Try to free the ctxt.
130 rc = __llog_ctxt_put(env, ctxt);
132 CERROR("Error %d while cleaning up ctxt %p\n",
135 l_wait_event(olg->olg_waitq,
136 llog_group_ctxt_null(olg, idx), &lwi);
140 EXPORT_SYMBOL(llog_cleanup);
142 int llog_setup(const struct lu_env *env, struct obd_device *obd,
143 struct obd_llog_group *olg, int index,
144 struct obd_device *disk_obd, struct llog_operations *op)
146 struct llog_ctxt *ctxt;
149 if (index < 0 || index >= LLOG_MAX_CTXTS)
154 ctxt = llog_new_ctxt(obd);
160 ctxt->loc_idx = index;
161 ctxt->loc_logops = op;
162 mutex_init(&ctxt->loc_mutex);
163 ctxt->loc_exp = class_export_get(disk_obd->obd_self_export);
164 ctxt->loc_flags = LLOG_CTXT_FLAG_UNINITIALIZED;
166 rc = llog_group_set_ctxt(olg, ctxt, index);
168 llog_ctxt_destroy(ctxt);
170 ctxt = llog_group_get_ctxt(olg, index);
173 * mds_lov_update_desc() might call here multiple
174 * times. So if the llog is already set up then
175 * don't to do it again.
177 CDEBUG(D_CONFIG, "obd %s ctxt %d already set up\n",
178 obd->obd_name, index);
179 LASSERT(ctxt->loc_olg == olg);
180 LASSERT(ctxt->loc_obd == obd);
181 LASSERT(ctxt->loc_exp == disk_obd->obd_self_export);
182 LASSERT(ctxt->loc_logops == op);
191 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LLOG_SETUP))
194 rc = op->lop_setup(env, obd, olg, index, disk_obd);
198 CERROR("%s: ctxt %d lop_setup=%p failed: rc = %d\n",
199 obd->obd_name, index, op->lop_setup, rc);
200 llog_group_clear_ctxt(olg, index);
201 llog_ctxt_destroy(ctxt);
203 CDEBUG(D_CONFIG, "obd %s ctxt %d is initialized\n",
204 obd->obd_name, index);
205 ctxt->loc_flags &= ~LLOG_CTXT_FLAG_UNINITIALIZED;
210 EXPORT_SYMBOL(llog_setup);
212 /* context key constructor/destructor: llog_key_init, llog_key_fini */
213 LU_KEY_INIT_FINI(llog, struct llog_thread_info);
214 /* context key: llog_thread_key */
215 LU_CONTEXT_KEY_DEFINE(llog, LCT_MD_THREAD | LCT_MG_THREAD | LCT_LOCAL);
216 LU_KEY_INIT_GENERIC(llog);
217 EXPORT_SYMBOL(llog_thread_key);
219 int llog_info_init(void)
221 llog_key_init_generic(&llog_thread_key, NULL);
222 lu_context_key_register(&llog_thread_key);
226 void llog_info_fini(void)
228 lu_context_key_degister(&llog_thread_key);