lustre/ptlrpc/recov_thread.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 2003 Cluster File Systems, Inc.
   5  *   Author: Andreas Dilger <adilger@clusterfs.com>
   6  *
   7  *   This file is part of the Lustre file system, http://www.lustre.org
   8  *   Lustre is a trademark of Cluster File Systems, Inc.
   9  *
  10  *   You may have signed or agreed to another license before downloading
  11  *   this software.  If so, you are bound by the terms and conditions
  12  *   of that agreement, and the following does not apply to you.  See the
  13  *   LICENSE file included with this distribution for more information.
  14  *
  15  *   If you did not agree to a different license, then this copy of Lustre
  16  *   is open source software; you can redistribute it and/or modify it
  17  *   under the terms of version 2 of the GNU General Public License as
  18  *   published by the Free Software Foundation.
  19  *
  20  *   In either case, Lustre is distributed in the hope that it will be
  21  *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  22  *   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *   license text for more details.
  24  *
  25  * OST<->MDS recovery logging thread.
  26  *
  27  * Invariants in implementation:
  28  * - we do not share logs among different OST<->MDS connections, so that
  29  *   if an OST or MDS fails it need only look at log(s) relevant to itself
  30  */
  31
  32 #define DEBUG_SUBSYSTEM S_LOG
  33
  34 #ifndef EXPORT_SYMTAB
  35 # define EXPORT_SYMTAB
  36 #endif
  37
  38 #ifdef __KERNEL__
  39 #include <linux/fs.h>
  40 #else
  41 # include <libcfs/list.h>
  42 # include <liblustre.h>
  43 #endif
  44
  45 #include <libcfs/kp30.h>
  46 #include <linux/obd_class.h>
  47 #include <linux/lustre_commit_confd.h>
  48 #include <linux/obd_support.h>
  49 #include <linux/obd_class.h>
  50 #include <linux/lustre_net.h>
  51 #include <lnet/types.h>
  52 #include <libcfs/list.h>
  53 #include <linux/lustre_log.h>
  54 #include "ptlrpc_internal.h"
  55
  56 #ifdef __KERNEL__
  57
  58 static struct llog_commit_master lustre_lcm;
  59 static struct llog_commit_master *lcm = &lustre_lcm;
  60
  61 /* Allocate new commit structs in case we do not have enough.
  62  * Make the llcd size small enough that it fits into a single page when we
  63  * are sending/receiving it. */
  64 static int llcd_alloc(void)
  65 {
  66         struct llog_canceld_ctxt *llcd;
  67         int llcd_size = 0;
  68
  69         llcd_size = 4096 - lustre_msg_size(1, &llcd_size);
  70         OBD_ALLOC(llcd,
  71                   llcd_size + offsetof(struct llog_canceld_ctxt, llcd_cookies));
  72         if (llcd == NULL)
  73                 return -ENOMEM;
  74
  75         llcd->llcd_size = llcd_size;
  76         llcd->llcd_lcm = lcm;
  77
  78         spin_lock(&lcm->lcm_llcd_lock);
  79         list_add(&llcd->llcd_list, &lcm->lcm_llcd_free);
  80         atomic_inc(&lcm->lcm_llcd_numfree);
  81         spin_unlock(&lcm->lcm_llcd_lock);
  82
  83         return 0;
  84 }
  85
  86 /* Get a free cookie struct from the list */
  87 struct llog_canceld_ctxt *llcd_grab(void)
  88 {
  89         struct llog_canceld_ctxt *llcd;
  90
  91 repeat:
  92         spin_lock(&lcm->lcm_llcd_lock);
  93         if (list_empty(&lcm->lcm_llcd_free)) {
  94                 spin_unlock(&lcm->lcm_llcd_lock);
  95                 if (llcd_alloc() < 0) {
  96                         CERROR("unable to allocate log commit data!\n");
  97                         return NULL;
  98                 }
  99                 /* check new llcd wasn't grabbed while lock dropped, b=7407 */
 100                 goto repeat;
 101         }
 102
 103         llcd = list_entry(lcm->lcm_llcd_free.next, typeof(*llcd), llcd_list);
 104         list_del(&llcd->llcd_list);
 105         atomic_dec(&lcm->lcm_llcd_numfree);
 106         spin_unlock(&lcm->lcm_llcd_lock);
 107
 108         llcd->llcd_cookiebytes = 0;
 109
 110         return llcd;
 111 }
 112 EXPORT_SYMBOL(llcd_grab);
 113
 114 static void llcd_put(struct llog_canceld_ctxt *llcd)
 115 {
 116         if (atomic_read(&lcm->lcm_llcd_numfree) >= lcm->lcm_llcd_maxfree) {
 117                 int llcd_size = llcd->llcd_size +
 118                          offsetof(struct llog_canceld_ctxt, llcd_cookies);
 119                 OBD_FREE(llcd, llcd_size);
 120         } else {
 121                 spin_lock(&lcm->lcm_llcd_lock);
 122                 list_add(&llcd->llcd_list, &lcm->lcm_llcd_free);
 123                 atomic_inc(&lcm->lcm_llcd_numfree);
 124                 spin_unlock(&lcm->lcm_llcd_lock);
 125         }
 126 }
 127
 128 /* Send some cookies to the appropriate target */
 129 void llcd_send(struct llog_canceld_ctxt *llcd)
 130 {
 131         spin_lock(&llcd->llcd_lcm->lcm_llcd_lock);
 132         list_add_tail(&llcd->llcd_list, &llcd->llcd_lcm->lcm_llcd_pending);
 133         spin_unlock(&llcd->llcd_lcm->lcm_llcd_lock);
 134
 135         wake_up_nr(&llcd->llcd_lcm->lcm_waitq, 1);
 136 }
 137 EXPORT_SYMBOL(llcd_send);
 138
 139 /* deleted objects have a commit callback that cancels the MDS
 140  * log record for the deletion.  The commit callback calls this
 141  * function
 142  */
 143 int llog_obd_repl_cancel(struct llog_ctxt *ctxt,
 144                          struct lov_stripe_md *lsm, int count,
 145                          struct llog_cookie *cookies, int flags)
 146 {
 147         struct llog_canceld_ctxt *llcd;
 148         int rc = 0;
 149         ENTRY;
 150
 151         LASSERT(ctxt);
 152
 153         down(&ctxt->loc_sem);
 154         if (ctxt->loc_imp == NULL) {
 155                 CWARN("no import for ctxt %p\n", ctxt);
 156                 GOTO(out, rc = 0);
 157         }
 158
 159         llcd = ctxt->loc_llcd;
 160
 161         if (count > 0 && cookies != NULL) {
 162                 if (llcd == NULL) {
 163                         llcd = llcd_grab();
 164                         if (llcd == NULL) {
 165                                 CERROR("couldn't get an llcd - dropped "LPX64
 166                                        ":%x+%u\n",
 167                                        cookies->lgc_lgl.lgl_oid,
 168                                        cookies->lgc_lgl.lgl_ogen,
 169                                        cookies->lgc_index);
 170                                 GOTO(out, rc = -ENOMEM);
 171                         }
 172                         llcd->llcd_ctxt = ctxt;
 173                         ctxt->loc_llcd = llcd;
 174                 }
 175
 176                 memcpy((char *)llcd->llcd_cookies + llcd->llcd_cookiebytes,
 177                        cookies, sizeof(*cookies));
 178                 llcd->llcd_cookiebytes += sizeof(*cookies);
 179         } else {
 180                 if (llcd == NULL || !(flags & OBD_LLOG_FL_SENDNOW))
 181                         GOTO(out, rc);
 182         }
 183
 184         if ((llcd->llcd_size - llcd->llcd_cookiebytes) < sizeof(*cookies) ||
 185             (flags & OBD_LLOG_FL_SENDNOW)) {
 186                 CDEBUG(D_HA, "send llcd %p:%p\n", llcd, llcd->llcd_ctxt);
 187                 ctxt->loc_llcd = NULL;
 188                 llcd_send(llcd);
 189         }
 190 out:
 191         up(&ctxt->loc_sem);
 192         return rc;
 193 }
 194 EXPORT_SYMBOL(llog_obd_repl_cancel);
 195
 196 int llog_obd_repl_sync(struct llog_ctxt *ctxt, struct obd_export *exp)
 197 {
 198         int rc = 0;
 199         ENTRY;
 200
 201         if (exp && (ctxt->loc_imp == exp->exp_imp_reverse)) {
 202                 CDEBUG(D_HA, "reverse import disconnected, put llcd %p:%p\n",
 203                        ctxt->loc_llcd, ctxt);
 204                 down(&ctxt->loc_sem);
 205                 if (ctxt->loc_llcd != NULL) {
 206                         llcd_put(ctxt->loc_llcd);
 207                         ctxt->loc_llcd = NULL;
 208                 }
 209                 ctxt->loc_imp = NULL;
 210                 up(&ctxt->loc_sem);
 211         } else {
 212                 rc = llog_cancel(ctxt, NULL, 0, NULL, OBD_LLOG_FL_SENDNOW);
 213         }
 214
 215         RETURN(rc);
 216 }
 217 EXPORT_SYMBOL(llog_obd_repl_sync);
 218
 219 static int log_commit_thread(void *arg)
 220 {
 221         struct llog_commit_master *lcm = arg;
 222         struct llog_commit_daemon *lcd;
 223         struct llog_canceld_ctxt *llcd, *n;
 224         unsigned long flags;
 225         ENTRY;
 226
 227         OBD_ALLOC(lcd, sizeof(*lcd));
 228         if (lcd == NULL)
 229                 RETURN(-ENOMEM);
 230
 231         lock_kernel();
 232         ptlrpc_daemonize(); /* thread never needs to do IO */
 233
 234         SIGNAL_MASK_LOCK(current, flags);
 235         sigfillset(&current->blocked);
 236         RECALC_SIGPENDING;
 237         SIGNAL_MASK_UNLOCK(current, flags);
 238
 239         spin_lock(&lcm->lcm_thread_lock);
 240         THREAD_NAME(current->comm, sizeof(current->comm) - 1,
 241                     "ll_log_comt_%02d", atomic_read(&lcm->lcm_thread_total));
 242         atomic_inc(&lcm->lcm_thread_total);
 243         spin_unlock(&lcm->lcm_thread_lock);
 244         unlock_kernel();
 245
 246         INIT_LIST_HEAD(&lcd->lcd_lcm_list);
 247         INIT_LIST_HEAD(&lcd->lcd_llcd_list);
 248         lcd->lcd_lcm = lcm;
 249
 250         CDEBUG(D_HA, "%s started\n", current->comm);
 251         do {
 252                 struct ptlrpc_request *request;
 253                 struct obd_import *import = NULL;
 254                 struct list_head *sending_list;
 255                 int rc = 0;
 256
 257                 /* If we do not have enough pages available, allocate some */
 258                 while (atomic_read(&lcm->lcm_llcd_numfree) <
 259                        lcm->lcm_llcd_minfree) {
 260                         if (llcd_alloc() < 0)
 261                                 break;
 262                 }
 263
 264                 spin_lock(&lcm->lcm_thread_lock);
 265                 atomic_inc(&lcm->lcm_thread_numidle);
 266                 list_move(&lcd->lcd_lcm_list, &lcm->lcm_thread_idle);
 267                 spin_unlock(&lcm->lcm_thread_lock);
 268
 269                 wait_event_interruptible(lcm->lcm_waitq,
 270                                          !list_empty(&lcm->lcm_llcd_pending) ||
 271                                          lcm->lcm_flags & LLOG_LCM_FL_EXIT);
 272
 273                 /* If we are the last available thread, start a new one in case
 274                  * we get blocked on an RPC (nobody else will start a new one)*/
 275                 spin_lock(&lcm->lcm_thread_lock);
 276                 atomic_dec(&lcm->lcm_thread_numidle);
 277                 list_move(&lcd->lcd_lcm_list, &lcm->lcm_thread_busy);
 278                 spin_unlock(&lcm->lcm_thread_lock);
 279
 280                 sending_list = &lcm->lcm_llcd_pending;
 281         resend:
 282                 import = NULL;
 283                 if (lcm->lcm_flags & LLOG_LCM_FL_EXIT) {
 284                         lcm->lcm_llcd_maxfree = 0;
 285                         lcm->lcm_llcd_minfree = 0;
 286                         lcm->lcm_thread_max = 0;
 287
 288                         if (list_empty(&lcm->lcm_llcd_pending) ||
 289                             lcm->lcm_flags & LLOG_LCM_FL_EXIT_FORCE)
 290                                 break;
 291                 }
 292
 293                 if (atomic_read(&lcm->lcm_thread_numidle) <= 1 &&
 294                     atomic_read(&lcm->lcm_thread_total) < lcm->lcm_thread_max) {
 295                         rc = llog_start_commit_thread();
 296                         if (rc < 0)
 297                                 CERROR("error starting thread: rc %d\n", rc);
 298                 }
 299
 300                 /* Move all of the pending cancels from the same OST off of
 301                  * the list, so we don't get multiple threads blocked and/or
 302                  * doing upcalls on the same OST in case of failure. */
 303                 spin_lock(&lcm->lcm_llcd_lock);
 304                 if (!list_empty(sending_list)) {
 305                         list_move_tail(sending_list->next,
 306                                        &lcd->lcd_llcd_list);
 307                         llcd = list_entry(lcd->lcd_llcd_list.next,
 308                                           typeof(*llcd), llcd_list);
 309                         LASSERT(llcd->llcd_lcm == lcm);
 310                         import = llcd->llcd_ctxt->loc_imp;
 311                 }
 312                 list_for_each_entry_safe(llcd, n, sending_list, llcd_list) {
 313                         LASSERT(llcd->llcd_lcm == lcm);
 314                         if (import == llcd->llcd_ctxt->loc_imp)
 315                                 list_move_tail(&llcd->llcd_list,
 316                                                &lcd->lcd_llcd_list);
 317                 }
 318                 if (sending_list != &lcm->lcm_llcd_resend) {
 319                         list_for_each_entry_safe(llcd, n, &lcm->lcm_llcd_resend,
 320                                                  llcd_list) {
 321                                 LASSERT(llcd->llcd_lcm == lcm);
 322                                 if (import == llcd->llcd_ctxt->loc_imp)
 323                                         list_move_tail(&llcd->llcd_list,
 324                                                        &lcd->lcd_llcd_list);
 325                         }
 326                 }
 327                 spin_unlock(&lcm->lcm_llcd_lock);
 328
 329                 /* We are the only one manipulating our local list - no lock */
 330                 list_for_each_entry_safe(llcd,n, &lcd->lcd_llcd_list,llcd_list){
 331                         char *bufs[1] = {(char *)llcd->llcd_cookies};
 332
 333                         list_del(&llcd->llcd_list);
 334                         if (llcd->llcd_cookiebytes == 0) {
 335                                 CDEBUG(D_HA, "put empty llcd %p:%p\n",
 336                                        llcd, llcd->llcd_ctxt);
 337                                 llcd_put(llcd);
 338                                 continue;
 339                         }
 340
 341                         down(&llcd->llcd_ctxt->loc_sem);
 342                         if (llcd->llcd_ctxt->loc_imp == NULL) {
 343                                 up(&llcd->llcd_ctxt->loc_sem);
 344                                 CWARN("import will be destroyed, put "
 345                                       "llcd %p:%p\n", llcd, llcd->llcd_ctxt);
 346                                 llcd_put(llcd);
 347                                 continue;
 348                         }
 349                         up(&llcd->llcd_ctxt->loc_sem);
 350
 351                         if (!import || (import == LP_POISON)) {
 352                                 CERROR("No import %p (llcd=%p, ctxt=%p)\n",
 353                                        import, llcd, llcd->llcd_ctxt);
 354                                 llcd_put(llcd);
 355                                 continue;
 356                         }
 357
 358                         request = ptlrpc_prep_req(import, LUSTRE_LOG_VERSION,
 359                                                   OBD_LOG_CANCEL, 1,
 360                                                   &llcd->llcd_cookiebytes,
 361                                                   bufs);
 362                         if (request == NULL) {
 363                                 rc = -ENOMEM;
 364                                 CERROR("error preparing commit: rc %d\n", rc);
 365
 366                                 spin_lock(&lcm->lcm_llcd_lock);
 367                                 list_splice(&lcd->lcd_llcd_list,
 368                                             &lcm->lcm_llcd_resend);
 369                                 INIT_LIST_HEAD(&lcd->lcd_llcd_list);
 370                                 spin_unlock(&lcm->lcm_llcd_lock);
 371                                 break;
 372                         }
 373
 374                         /* XXX FIXME bug 249, 5515 */
 375                         request->rq_request_portal = LDLM_CANCEL_REQUEST_PORTAL;
 376                         request->rq_reply_portal = LDLM_CANCEL_REPLY_PORTAL;
 377
 378                         request->rq_replen = lustre_msg_size(0, NULL);
 379                         down(&llcd->llcd_ctxt->loc_sem);
 380                         if (llcd->llcd_ctxt->loc_imp == NULL) {
 381                                 up(&llcd->llcd_ctxt->loc_sem);
 382                                 CWARN("import will be destroyed, put "
 383                                       "llcd %p:%p\n", llcd, llcd->llcd_ctxt);
 384                                 llcd_put(llcd);
 385                                 ptlrpc_req_finished(request);
 386                                 continue;
 387                         }
 388                         up(&llcd->llcd_ctxt->loc_sem);
 389                         rc = ptlrpc_queue_wait(request);
 390                         ptlrpc_req_finished(request);
 391
 392                         /* If the RPC failed, we put this and the remaining
 393                          * messages onto the resend list for another time. */
 394                         if (rc == 0) {
 395                                 llcd_put(llcd);
 396                                 continue;
 397                         }
 398
 399                         CERROR("commit %p:%p drop %d cookies: rc %d\n",
 400                                llcd, llcd->llcd_ctxt,
 401                                (int)(llcd->llcd_cookiebytes /
 402                                      sizeof(*llcd->llcd_cookies)), rc);
 403                         llcd_put(llcd);
 404                 }
 405
 406                 if (rc == 0) {
 407                         sending_list = &lcm->lcm_llcd_resend;
 408                         if (!list_empty(sending_list))
 409                                 goto resend;
 410                 }
 411         } while(1);
 412
 413         /* If we are force exiting, just drop all of the cookies. */
 414         if (lcm->lcm_flags & LLOG_LCM_FL_EXIT_FORCE) {
 415                 spin_lock(&lcm->lcm_llcd_lock);
 416                 list_splice(&lcm->lcm_llcd_pending, &lcd->lcd_llcd_list);
 417                 list_splice(&lcm->lcm_llcd_resend, &lcd->lcd_llcd_list);
 418                 list_splice(&lcm->lcm_llcd_free, &lcd->lcd_llcd_list);
 419                 spin_unlock(&lcm->lcm_llcd_lock);
 420
 421                 list_for_each_entry_safe(llcd, n, &lcd->lcd_llcd_list,llcd_list)
 422                         llcd_put(llcd);
 423         }
 424
 425         spin_lock(&lcm->lcm_thread_lock);
 426         list_del(&lcd->lcd_lcm_list);
 427         spin_unlock(&lcm->lcm_thread_lock);
 428         OBD_FREE(lcd, sizeof(*lcd));
 429
 430         CDEBUG(D_HA, "%s exiting\n", current->comm);
 431
 432         spin_lock(&lcm->lcm_thread_lock);
 433         atomic_dec(&lcm->lcm_thread_total);
 434         spin_unlock(&lcm->lcm_thread_lock);
 435         wake_up(&lcm->lcm_waitq);
 436
 437         return 0;
 438 }
 439
 440 int llog_start_commit_thread(void)
 441 {
 442         int rc;
 443         ENTRY;
 444
 445         if (atomic_read(&lcm->lcm_thread_total) >= lcm->lcm_thread_max)
 446                 RETURN(0);
 447
 448         rc = kernel_thread(log_commit_thread, lcm, CLONE_VM | CLONE_FILES);
 449         if (rc < 0) {
 450                 CERROR("error starting thread #%d: %d\n",
 451                        atomic_read(&lcm->lcm_thread_total), rc);
 452                 RETURN(rc);
 453         }
 454
 455         RETURN(0);
 456 }
 457 EXPORT_SYMBOL(llog_start_commit_thread);
 458
 459 static struct llog_process_args {
 460         struct semaphore         llpa_sem;
 461         struct llog_ctxt        *llpa_ctxt;
 462         void                    *llpa_cb;
 463         void                    *llpa_arg;
 464 } llpa;
 465
 466 int llog_init_commit_master(void)
 467 {
 468         INIT_LIST_HEAD(&lcm->lcm_thread_busy);
 469         INIT_LIST_HEAD(&lcm->lcm_thread_idle);
 470         spin_lock_init(&lcm->lcm_thread_lock);
 471         atomic_set(&lcm->lcm_thread_numidle, 0);
 472         init_waitqueue_head(&lcm->lcm_waitq);
 473         INIT_LIST_HEAD(&lcm->lcm_llcd_pending);
 474         INIT_LIST_HEAD(&lcm->lcm_llcd_resend);
 475         INIT_LIST_HEAD(&lcm->lcm_llcd_free);
 476         spin_lock_init(&lcm->lcm_llcd_lock);
 477         atomic_set(&lcm->lcm_llcd_numfree, 0);
 478         lcm->lcm_llcd_minfree = 0;
 479         lcm->lcm_thread_max = 5;
 480         /* FIXME initialize semaphore for llog_process_args */
 481         sema_init(&llpa.llpa_sem, 1);
 482         return 0;
 483 }
 484
 485 int llog_cleanup_commit_master(int force)
 486 {
 487         lcm->lcm_flags |= LLOG_LCM_FL_EXIT;
 488         if (force)
 489                 lcm->lcm_flags |= LLOG_LCM_FL_EXIT_FORCE;
 490         wake_up(&lcm->lcm_waitq);
 491
 492         wait_event_interruptible(lcm->lcm_waitq,
 493                                  atomic_read(&lcm->lcm_thread_total) == 0);
 494         return 0;
 495 }
 496
 497 static int log_process_thread(void *args)
 498 {
 499         struct llog_process_args *data = args;
 500         struct llog_ctxt *ctxt = data->llpa_ctxt;
 501         void   *cb = data->llpa_cb;
 502         struct llog_logid logid = *(struct llog_logid *)(data->llpa_arg);
 503         struct llog_handle *llh = NULL;
 504         unsigned long flags;
 505         int rc;
 506         ENTRY;
 507
 508         up(&data->llpa_sem);
 509         lock_kernel();
 510         ptlrpc_daemonize();     /* thread does IO to log files */
 511         THREAD_NAME(current->comm, sizeof(current->comm) - 1, "llog_process");
 512
 513         SIGNAL_MASK_LOCK(current, flags);
 514         sigfillset(&current->blocked);
 515         RECALC_SIGPENDING;
 516         SIGNAL_MASK_UNLOCK(current, flags);
 517         unlock_kernel();
 518
 519         rc = llog_create(ctxt, &llh, &logid, NULL);
 520         if (rc) {
 521                 CERROR("llog_create failed %d\n", rc);
 522                 RETURN(rc);
 523         }
 524         rc = llog_init_handle(llh, LLOG_F_IS_CAT, NULL);
 525         if (rc) {
 526                 CERROR("llog_init_handle failed %d\n", rc);
 527                 GOTO(out, rc);
 528         }
 529
 530         if (cb) {
 531                 rc = llog_cat_process(llh, (llog_cb_t)cb, NULL);
 532                 if (rc != LLOG_PROC_BREAK)
 533                         CERROR("llog_cat_process failed %d\n", rc);
 534         } else {
 535                 CWARN("no callback function for recovery\n");
 536         }
 537
 538         CDEBUG(D_HA, "send llcd %p:%p forcibly after recovery\n",
 539                ctxt->loc_llcd, ctxt);
 540         llog_sync(ctxt, NULL);
 541 out:
 542         rc = llog_cat_put(llh);
 543         if (rc)
 544                 CERROR("llog_cat_put failed %d\n", rc);
 545
 546         RETURN(rc);
 547 }
 548
 549 static int llog_recovery_generic(struct llog_ctxt *ctxt, void *handle,void *arg)
 550 {
 551         int rc;
 552         ENTRY;
 553
 554         down(&llpa.llpa_sem);
 555         llpa.llpa_ctxt = ctxt;
 556         llpa.llpa_cb = handle;
 557         llpa.llpa_arg = arg;
 558
 559         rc = kernel_thread(log_process_thread, &llpa, CLONE_VM | CLONE_FILES);
 560         if (rc < 0)
 561                 CERROR("error starting log_process_thread: %d\n", rc);
 562         else {
 563                 CDEBUG(D_HA, "log_process_thread: %d\n", rc);
 564                 rc = 0;
 565         }
 566
 567         RETURN(rc);
 568 }
 569
 570 int llog_repl_connect(struct llog_ctxt *ctxt, int count,
 571                       struct llog_logid *logid, struct llog_gen *gen,
 572                       struct obd_uuid *uuid)
 573 {
 574         struct llog_canceld_ctxt *llcd;
 575         int rc;
 576         ENTRY;
 577
 578         /* send back llcd before recovery from llog */
 579         if (ctxt->loc_llcd != NULL) {
 580                 CWARN("llcd %p:%p not empty\n", ctxt->loc_llcd, ctxt);
 581                 llog_sync(ctxt, NULL);
 582         }
 583
 584         down(&ctxt->loc_sem);
 585         ctxt->loc_gen = *gen;
 586         llcd = llcd_grab();
 587         if (llcd == NULL) {
 588                 CERROR("couldn't get an llcd\n");
 589                 up(&ctxt->loc_sem);
 590                 RETURN(-ENOMEM);
 591         }
 592         llcd->llcd_ctxt = ctxt;
 593         ctxt->loc_llcd = llcd;
 594         up(&ctxt->loc_sem);
 595
 596         rc = llog_recovery_generic(ctxt, ctxt->llog_proc_cb, logid);
 597         if (rc != 0)
 598                 CERROR("error recovery process: %d\n", rc);
 599
 600         RETURN(rc);
 601 }
 602 EXPORT_SYMBOL(llog_repl_connect);
 603
 604 #else /* !__KERNEL__ */
 605
 606 int llog_obd_repl_cancel(struct llog_ctxt *ctxt,
 607                          struct lov_stripe_md *lsm, int count,
 608                          struct llog_cookie *cookies, int flags)
 609 {
 610         return 0;
 611 }
 612 #endif