drivers/staging/lustre/lustre/obdclass/llog_obd.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  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).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LOG
  38
  39
  40 #include <obd_class.h>
  41 #include <lustre_log.h>
  42 #include "llog_internal.h"
  43
  44 /* helper functions for calling the llog obd methods */
  45 static struct llog_ctxt* llog_new_ctxt(struct obd_device *obd)
  46 {
  47         struct llog_ctxt *ctxt;
  48
  49         OBD_ALLOC_PTR(ctxt);
  50         if (!ctxt)
  51                 return NULL;
  52
  53         ctxt->loc_obd = obd;
  54         atomic_set(&ctxt->loc_refcount, 1);
  55
  56         return ctxt;
  57 }
  58
  59 static void llog_ctxt_destroy(struct llog_ctxt *ctxt)
  60 {
  61         if (ctxt->loc_exp) {
  62                 class_export_put(ctxt->loc_exp);
  63                 ctxt->loc_exp = NULL;
  64         }
  65         if (ctxt->loc_imp) {
  66                 class_import_put(ctxt->loc_imp);
  67                 ctxt->loc_imp = NULL;
  68         }
  69         OBD_FREE_PTR(ctxt);
  70 }
  71
  72 int __llog_ctxt_put(const struct lu_env *env, struct llog_ctxt *ctxt)
  73 {
  74         struct obd_llog_group *olg = ctxt->loc_olg;
  75         struct obd_device *obd;
  76         int rc = 0;
  77
  78         spin_lock(&olg->olg_lock);
  79         if (!atomic_dec_and_test(&ctxt->loc_refcount)) {
  80                 spin_unlock(&olg->olg_lock);
  81                 return rc;
  82         }
  83         olg->olg_ctxts[ctxt->loc_idx] = NULL;
  84         spin_unlock(&olg->olg_lock);
  85
  86         obd = ctxt->loc_obd;
  87         spin_lock(&obd->obd_dev_lock);
  88         /* sync with llog ctxt user thread */
  89         spin_unlock(&obd->obd_dev_lock);
  90
  91         /* obd->obd_starting is needed for the case of cleanup
  92          * 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);
  97
  98         /* cleanup the llog ctxt here */
  99         if (CTXTP(ctxt, cleanup))
 100                 rc = CTXTP(ctxt, cleanup)(env, ctxt);
 101
 102         llog_ctxt_destroy(ctxt);
 103         wake_up(&olg->olg_waitq);
 104         return rc;
 105 }
 106 EXPORT_SYMBOL(__llog_ctxt_put);
 107
 108 int llog_cleanup(const struct lu_env *env, struct llog_ctxt *ctxt)
 109 {
 110         struct l_wait_info lwi = LWI_INTR(LWI_ON_SIGNAL_NOOP, NULL);
 111         struct obd_llog_group *olg;
 112         int rc, idx;
 113
 114         LASSERT(ctxt != NULL);
 115         LASSERT(ctxt != LP_POISON);
 116
 117         olg = ctxt->loc_olg;
 118         LASSERT(olg != NULL);
 119         LASSERT(olg != LP_POISON);
 120
 121         idx = ctxt->loc_idx;
 122
 123         /*
 124          * Banlance the ctxt get when calling llog_cleanup()
 125          */
 126         LASSERT(atomic_read(&ctxt->loc_refcount) < LI_POISON);
 127         LASSERT(atomic_read(&ctxt->loc_refcount) > 1);
 128         llog_ctxt_put(ctxt);
 129
 130         /*
 131          * Try to free the ctxt.
 132          */
 133         rc = __llog_ctxt_put(env, ctxt);
 134         if (rc)
 135                 CERROR("Error %d while cleaning up ctxt %p\n",
 136                        rc, ctxt);
 137
 138         l_wait_event(olg->olg_waitq,
 139                      llog_group_ctxt_null(olg, idx), &lwi);
 140
 141         return rc;
 142 }
 143 EXPORT_SYMBOL(llog_cleanup);
 144
 145 int llog_setup(const struct lu_env *env, struct obd_device *obd,
 146                struct obd_llog_group *olg, int index,
 147                struct obd_device *disk_obd, struct llog_operations *op)
 148 {
 149         struct llog_ctxt *ctxt;
 150         int rc = 0;
 151
 152         if (index < 0 || index >= LLOG_MAX_CTXTS)
 153                 return -EINVAL;
 154
 155         LASSERT(olg != NULL);
 156
 157         ctxt = llog_new_ctxt(obd);
 158         if (!ctxt)
 159                 return -ENOMEM;
 160
 161         ctxt->loc_obd = obd;
 162         ctxt->loc_olg = olg;
 163         ctxt->loc_idx = index;
 164         ctxt->loc_logops = op;
 165         mutex_init(&ctxt->loc_mutex);
 166         ctxt->loc_exp = class_export_get(disk_obd->obd_self_export);
 167         ctxt->loc_flags = LLOG_CTXT_FLAG_UNINITIALIZED;
 168
 169         rc = llog_group_set_ctxt(olg, ctxt, index);
 170         if (rc) {
 171                 llog_ctxt_destroy(ctxt);
 172                 if (rc == -EEXIST) {
 173                         ctxt = llog_group_get_ctxt(olg, index);
 174                         if (ctxt) {
 175                                 /*
 176                                  * mds_lov_update_desc() might call here multiple
 177                                  * times. So if the llog is already set up then
 178                                  * don't to do it again.
 179                                  */
 180                                 CDEBUG(D_CONFIG, "obd %s ctxt %d already set up\n",
 181                                        obd->obd_name, index);
 182                                 LASSERT(ctxt->loc_olg == olg);
 183                                 LASSERT(ctxt->loc_obd == obd);
 184                                 LASSERT(ctxt->loc_exp == disk_obd->obd_self_export);
 185                                 LASSERT(ctxt->loc_logops == op);
 186                                 llog_ctxt_put(ctxt);
 187                         }
 188                         rc = 0;
 189                 }
 190                 return rc;
 191         }
 192
 193         if (op->lop_setup) {
 194                 if (OBD_FAIL_CHECK(OBD_FAIL_OBD_LLOG_SETUP))
 195                         rc = -EOPNOTSUPP;
 196                 else
 197                         rc = op->lop_setup(env, obd, olg, index, disk_obd);
 198         }
 199
 200         if (rc) {
 201                 CERROR("%s: ctxt %d lop_setup=%p failed: rc = %d\n",
 202                        obd->obd_name, index, op->lop_setup, rc);
 203                 llog_group_clear_ctxt(olg, index);
 204                 llog_ctxt_destroy(ctxt);
 205         } else {
 206                 CDEBUG(D_CONFIG, "obd %s ctxt %d is initialized\n",
 207                        obd->obd_name, index);
 208                 ctxt->loc_flags &= ~LLOG_CTXT_FLAG_UNINITIALIZED;
 209         }
 210
 211         return rc;
 212 }
 213 EXPORT_SYMBOL(llog_setup);
 214
 215 int llog_sync(struct llog_ctxt *ctxt, struct obd_export *exp, int flags)
 216 {
 217         int rc = 0;
 218
 219         if (!ctxt)
 220                 return 0;
 221
 222         if (CTXTP(ctxt, sync))
 223                 rc = CTXTP(ctxt, sync)(ctxt, exp, flags);
 224
 225         return rc;
 226 }
 227 EXPORT_SYMBOL(llog_sync);
 228
 229 int llog_obd_add(const struct lu_env *env, struct llog_ctxt *ctxt,
 230                  struct llog_rec_hdr *rec, struct lov_stripe_md *lsm,
 231                  struct llog_cookie *logcookies, int numcookies)
 232 {
 233         int raised, rc;
 234
 235         if (!ctxt) {
 236                 CERROR("No ctxt\n");
 237                 return -ENODEV;
 238         }
 239
 240         if (ctxt->loc_flags & LLOG_CTXT_FLAG_UNINITIALIZED)
 241                 return -ENXIO;
 242
 243         CTXT_CHECK_OP(ctxt, obd_add, -EOPNOTSUPP);
 244         raised = cfs_cap_raised(CFS_CAP_SYS_RESOURCE);
 245         if (!raised)
 246                 cfs_cap_raise(CFS_CAP_SYS_RESOURCE);
 247         rc = CTXTP(ctxt, obd_add)(env, ctxt, rec, lsm, logcookies,
 248                                   numcookies);
 249         if (!raised)
 250                 cfs_cap_lower(CFS_CAP_SYS_RESOURCE);
 251         return rc;
 252 }
 253 EXPORT_SYMBOL(llog_obd_add);
 254
 255 int llog_cancel(const struct lu_env *env, struct llog_ctxt *ctxt,
 256                 struct lov_stripe_md *lsm, int count,
 257                 struct llog_cookie *cookies, int flags)
 258 {
 259         int rc;
 260
 261         if (!ctxt) {
 262                 CERROR("No ctxt\n");
 263                 return -ENODEV;
 264         }
 265
 266         CTXT_CHECK_OP(ctxt, cancel, -EOPNOTSUPP);
 267         rc = CTXTP(ctxt, cancel)(env, ctxt, lsm, count, cookies, flags);
 268         return rc;
 269 }
 270 EXPORT_SYMBOL(llog_cancel);
 271
 272 int obd_llog_init(struct obd_device *obd, struct obd_llog_group *olg,
 273                   struct obd_device *disk_obd, int *index)
 274 {
 275         int rc;
 276
 277         OBD_CHECK_DT_OP(obd, llog_init, 0);
 278         OBD_COUNTER_INCREMENT(obd, llog_init);
 279
 280         rc = OBP(obd, llog_init)(obd, olg, disk_obd, index);
 281         return rc;
 282 }
 283 EXPORT_SYMBOL(obd_llog_init);
 284
 285 int obd_llog_finish(struct obd_device *obd, int count)
 286 {
 287         int rc;
 288
 289         OBD_CHECK_DT_OP(obd, llog_finish, 0);
 290         OBD_COUNTER_INCREMENT(obd, llog_finish);
 291
 292         rc = OBP(obd, llog_finish)(obd, count);
 293         return rc;
 294 }
 295 EXPORT_SYMBOL(obd_llog_finish);
 296
 297 /* context key constructor/destructor: llog_key_init, llog_key_fini */
 298 LU_KEY_INIT_FINI(llog, struct llog_thread_info);
 299 /* context key: llog_thread_key */
 300 LU_CONTEXT_KEY_DEFINE(llog, LCT_MD_THREAD | LCT_MG_THREAD | LCT_LOCAL);
 301 LU_KEY_INIT_GENERIC(llog);
 302 EXPORT_SYMBOL(llog_thread_key);
 303
 304 int llog_info_init(void)
 305 {
 306         llog_key_init_generic(&llog_thread_key, NULL);
 307         lu_context_key_register(&llog_thread_key);
 308         return 0;
 309 }
 310
 311 void llog_info_fini(void)
 312 {
 313         lu_context_key_degister(&llog_thread_key);
 314 }