| /* |
| * GPL HEADER START |
| * |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 only, |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License version 2 for more details (a copy is included |
| * in the LICENSE file that accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License |
| * version 2 along with this program; If not, see |
| * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| * GPL HEADER END |
| */ |
| /* |
| * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Use is subject to license terms. |
| * |
| * Copyright (c) 2012, 2015, Intel Corporation. |
| */ |
| /* |
| * This file is part of Lustre, http://www.lustre.org/ |
| * Lustre is a trademark of Sun Microsystems, Inc. |
| */ |
| |
| #define DEBUG_SUBSYSTEM S_LOG |
| |
| #include "../include/obd_class.h" |
| #include "../include/lustre_log.h" |
| #include "llog_internal.h" |
| |
| /* helper functions for calling the llog obd methods */ |
| static struct llog_ctxt *llog_new_ctxt(struct obd_device *obd) |
| { |
| struct llog_ctxt *ctxt; |
| |
| ctxt = kzalloc(sizeof(*ctxt), GFP_NOFS); |
| if (!ctxt) |
| return NULL; |
| |
| ctxt->loc_obd = obd; |
| atomic_set(&ctxt->loc_refcount, 1); |
| |
| return ctxt; |
| } |
| |
| static void llog_ctxt_destroy(struct llog_ctxt *ctxt) |
| { |
| if (ctxt->loc_exp) { |
| class_export_put(ctxt->loc_exp); |
| ctxt->loc_exp = NULL; |
| } |
| if (ctxt->loc_imp) { |
| class_import_put(ctxt->loc_imp); |
| ctxt->loc_imp = NULL; |
| } |
| kfree(ctxt); |
| } |
| |
| int __llog_ctxt_put(const struct lu_env *env, struct llog_ctxt *ctxt) |
| { |
| struct obd_llog_group *olg = ctxt->loc_olg; |
| struct obd_device *obd; |
| int rc = 0; |
| |
| spin_lock(&olg->olg_lock); |
| if (!atomic_dec_and_test(&ctxt->loc_refcount)) { |
| spin_unlock(&olg->olg_lock); |
| return rc; |
| } |
| olg->olg_ctxts[ctxt->loc_idx] = NULL; |
| spin_unlock(&olg->olg_lock); |
| |
| obd = ctxt->loc_obd; |
| spin_lock(&obd->obd_dev_lock); |
| /* sync with llog ctxt user thread */ |
| spin_unlock(&obd->obd_dev_lock); |
| |
| /* obd->obd_starting is needed for the case of cleanup |
| * in error case while obd is starting up. |
| */ |
| LASSERTF(obd->obd_starting == 1 || |
| obd->obd_stopping == 1 || obd->obd_set_up == 0, |
| "wrong obd state: %d/%d/%d\n", !!obd->obd_starting, |
| !!obd->obd_stopping, !!obd->obd_set_up); |
| |
| /* cleanup the llog ctxt here */ |
| if (CTXTP(ctxt, cleanup)) |
| rc = CTXTP(ctxt, cleanup)(env, ctxt); |
| |
| llog_ctxt_destroy(ctxt); |
| wake_up(&olg->olg_waitq); |
| return rc; |
| } |
| EXPORT_SYMBOL(__llog_ctxt_put); |
| |
| int llog_cleanup(const struct lu_env *env, struct llog_ctxt *ctxt) |
| { |
| struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL); |
| struct obd_llog_group *olg; |
| int rc, idx; |
| |
| olg = ctxt->loc_olg; |
| LASSERT(olg); |
| LASSERT(olg != LP_POISON); |
| |
| idx = ctxt->loc_idx; |
| |
| /* |
| * Banlance the ctxt get when calling llog_cleanup() |
| */ |
| LASSERT(atomic_read(&ctxt->loc_refcount) < LI_POISON); |
| LASSERT(atomic_read(&ctxt->loc_refcount) > 1); |
| llog_ctxt_put(ctxt); |
| |
| /* |
| * Try to free the ctxt. |
| */ |
| rc = __llog_ctxt_put(env, ctxt); |
| if (rc) |
| CERROR("Error %d while cleaning up ctxt %p\n", |
| rc, ctxt); |
| |
| l_wait_event(olg->olg_waitq, |
| llog_group_ctxt_null(olg, idx), &lwi); |
| |
| return rc; |
| } |
| EXPORT_SYMBOL(llog_cleanup); |
| |
| int llog_setup(const struct lu_env *env, struct obd_device *obd, |
| struct obd_llog_group *olg, int index, |
| struct obd_device *disk_obd, struct llog_operations *op) |
| { |
| struct llog_ctxt *ctxt; |
| int rc = 0; |
| |
| if (index < 0 || index >= LLOG_MAX_CTXTS) |
| return -EINVAL; |
| |
| LASSERT(olg); |
| |
| ctxt = llog_new_ctxt(obd); |
| if (!ctxt) |
| return -ENOMEM; |
| |
| ctxt->loc_obd = obd; |
| ctxt->loc_olg = olg; |
| ctxt->loc_idx = index; |
| ctxt->loc_logops = op; |
| mutex_init(&ctxt->loc_mutex); |
| ctxt->loc_exp = class_export_get(disk_obd->obd_self_export); |
| ctxt->loc_flags = LLOG_CTXT_FLAG_UNINITIALIZED; |
| |
| rc = llog_group_set_ctxt(olg, ctxt, index); |
| if (rc) { |
| llog_ctxt_destroy(ctxt); |
| if (rc == -EEXIST) { |
| ctxt = llog_group_get_ctxt(olg, index); |
| if (ctxt) { |
| /* |
| * mds_lov_update_desc() might call here multiple |
| * times. So if the llog is already set up then |
| * don't to do it again. |
| */ |
| CDEBUG(D_CONFIG, "obd %s ctxt %d already set up\n", |
| obd->obd_name, index); |
| LASSERT(ctxt->loc_olg == olg); |
| LASSERT(ctxt->loc_obd == obd); |
| LASSERT(ctxt->loc_exp == disk_obd->obd_self_export); |
| LASSERT(ctxt->loc_logops == op); |
| llog_ctxt_put(ctxt); |
| } |
| rc = 0; |
| } |
| return rc; |
| } |
| |
| if (op->lop_setup) { |
| if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LLOG_SETUP)) |
| rc = -EOPNOTSUPP; |
| else |
| rc = op->lop_setup(env, obd, olg, index, disk_obd); |
| } |
| |
| if (rc) { |
| CERROR("%s: ctxt %d lop_setup=%p failed: rc = %d\n", |
| obd->obd_name, index, op->lop_setup, rc); |
| llog_group_clear_ctxt(olg, index); |
| llog_ctxt_destroy(ctxt); |
| } else { |
| CDEBUG(D_CONFIG, "obd %s ctxt %d is initialized\n", |
| obd->obd_name, index); |
| ctxt->loc_flags &= ~LLOG_CTXT_FLAG_UNINITIALIZED; |
| } |
| |
| return rc; |
| } |
| EXPORT_SYMBOL(llog_setup); |
| |
| /* context key constructor/destructor: llog_key_init, llog_key_fini */ |
| LU_KEY_INIT_FINI(llog, struct llog_thread_info); |
| /* context key: llog_thread_key */ |
| LU_CONTEXT_KEY_DEFINE(llog, LCT_MD_THREAD | LCT_MG_THREAD | LCT_LOCAL); |
| LU_KEY_INIT_GENERIC(llog); |
| EXPORT_SYMBOL(llog_thread_key); |
| |
| int llog_info_init(void) |
| { |
| llog_key_init_generic(&llog_thread_key, NULL); |
| lu_context_key_register(&llog_thread_key); |
| return 0; |
| } |
| |
| void llog_info_fini(void) |
| { |
| lu_context_key_degister(&llog_thread_key); |
| } |