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 <libcfs/libcfs.h>
  40 #else
  41 # include <libcfs/list.h>
  42 # include <liblustre.h>
  43 #endif
  44
  45 #include <libcfs/kp30.h>
  46 #include <obd_class.h>
  47 #include <lustre_commit_confd.h>
  48 #include <obd_support.h>
  49 #include <obd_class.h>
  50 #include <lustre_net.h>
  51 #include <lnet/types.h>
  52 #include <libcfs/list.h>
  53 #include <lustre_log.h>
  54 #include "ptlrpc_internal.h"
  55
  56 #ifdef __KERNEL__
  57
  58 /* Allocate new commit structs in case we do not have enough.
  59  * Make the llcd size small enough that it fits into a single page when we
  60  * are sending/receiving it. */
  61 static int llcd_alloc(struct llog_commit_master *lcm)
  62 {
  63         struct llog_canceld_ctxt *llcd;
  64         int llcd_size;
  65
  66         /* payload of lustre_msg V2 is bigger */
  67         llcd_size = 4096 - lustre_msg_size(LUSTRE_MSG_MAGIC_V2, 1, NULL);
  68         OBD_ALLOC(llcd,
  69                   llcd_size + offsetof(struct llog_canceld_ctxt, llcd_cookies));
  70         if (llcd == NULL)
  71                 return -ENOMEM;
  72
  73         llcd->llcd_size = llcd_size;
  74         llcd->llcd_lcm = lcm;
  75
  76         spin_lock(&lcm->lcm_llcd_lock);
  77         list_add(&llcd->llcd_list, &lcm->lcm_llcd_free);
  78         atomic_inc(&lcm->lcm_llcd_numfree);
  79         spin_unlock(&lcm->lcm_llcd_lock);
  80
  81         return 0;
  82 }
  83
  84 /* Get a free cookie struct from the list */
  85 static struct llog_canceld_ctxt *llcd_grab(struct llog_commit_master *lcm)
  86 {
  87         struct llog_canceld_ctxt *llcd;
  88
  89 repeat:
  90         spin_lock(&lcm->lcm_llcd_lock);
  91         if (list_empty(&lcm->lcm_llcd_free)) {
  92                 spin_unlock(&lcm->lcm_llcd_lock);
  93                 if (llcd_alloc(lcm) < 0) {
  94                         CERROR("unable to allocate log commit data!\n");
  95                         return NULL;
  96                 }
  97                 /* check new llcd wasn't grabbed while lock dropped, b=7407 */
  98                 goto repeat;
  99         }
 100
 101         llcd = list_entry(lcm->lcm_llcd_free.next, typeof(*llcd), llcd_list);
 102         list_del(&llcd->llcd_list);
 103         atomic_dec(&lcm->lcm_llcd_numfree);
 104         spin_unlock(&lcm->lcm_llcd_lock);
 105
 106         llcd->llcd_cookiebytes = 0;
 107
 108         return llcd;
 109 }
 110
 111 static void llcd_put(struct llog_canceld_ctxt *llcd)
 112 {
 113         struct llog_commit_master *lcm = llcd->llcd_lcm;
 114
 115         llog_ctxt_put(llcd->llcd_ctxt);
 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 static void llcd_send(struct llog_canceld_ctxt *llcd)
 130 {
 131         if (!(llcd->llcd_lcm->lcm_flags & LLOG_LCM_FL_EXIT)) {
 132                 spin_lock(&llcd->llcd_lcm->lcm_llcd_lock);
 133                 list_add_tail(&llcd->llcd_list,
 134                               &llcd->llcd_lcm->lcm_llcd_pending);
 135                 spin_unlock(&llcd->llcd_lcm->lcm_llcd_lock);
 136         }
 137         cfs_waitq_signal_nr(&llcd->llcd_lcm->lcm_waitq, 1);
 138 }
 139
 140 /* deleted objects have a commit callback that cancels the MDS
 141  * log record for the deletion.  The commit callback calls this
 142  * function
 143  */
 144 int llog_obd_repl_cancel(struct llog_ctxt *ctxt,
 145                          struct lov_stripe_md *lsm, int count,
 146                          struct llog_cookie *cookies, int flags)
 147 {
 148         struct llog_canceld_ctxt *llcd;
 149         int rc = 0;
 150         ENTRY;
 151
 152         LASSERT(ctxt);
 153
 154         mutex_down(&ctxt->loc_sem);
 155         if (ctxt->loc_imp == NULL) {
 156                 CDEBUG(D_RPCTRACE, "no import for ctxt %p\n", ctxt);
 157                 GOTO(out, rc = 0);
 158         }
 159
 160         llcd = ctxt->loc_llcd;
 161
 162         if (count > 0 && cookies != NULL) {
 163                 if (llcd == NULL) {
 164                         llcd = llcd_grab(ctxt->loc_lcm);
 165                         if (llcd == NULL) {
 166                                 CERROR("couldn't get an llcd - dropped "LPX64
 167                                        ":%x+%u\n",
 168                                        cookies->lgc_lgl.lgl_oid,
 169                                        cookies->lgc_lgl.lgl_ogen,
 170                                        cookies->lgc_index);
 171                                 GOTO(out, rc = -ENOMEM);
 172                         }
 173                         llcd->llcd_ctxt = llog_ctxt_get(ctxt);
 174                         ctxt->loc_llcd = llcd;
 175                 }
 176
 177                 memcpy((char *)llcd->llcd_cookies + llcd->llcd_cookiebytes,
 178                        cookies, sizeof(*cookies));
 179                 llcd->llcd_cookiebytes += sizeof(*cookies);
 180         } else {
 181                 if (llcd == NULL || !(flags & OBD_LLOG_FL_SENDNOW))
 182                         GOTO(out, rc);
 183         }
 184
 185         if ((llcd->llcd_size - llcd->llcd_cookiebytes) < sizeof(*cookies) ||
 186             (flags & OBD_LLOG_FL_SENDNOW)) {
 187                 CDEBUG(D_RPCTRACE, "send llcd %p:%p\n", llcd, llcd->llcd_ctxt);
 188                 ctxt->loc_llcd = NULL;
 189                 llcd_send(llcd);
 190         }
 191 out:
 192         mutex_up(&ctxt->loc_sem);
 193         return rc;
 194 }
 195 EXPORT_SYMBOL(llog_obd_repl_cancel);
 196
 197 int llog_obd_repl_sync(struct llog_ctxt *ctxt, struct obd_export *exp)
 198 {
 199         int rc = 0;
 200         ENTRY;
 201
 202         if (exp && (ctxt->loc_imp == exp->exp_imp_reverse)) {
 203                 CDEBUG(D_RPCTRACE,"reverse import disconnect, put llcd %p:%p\n",
 204                        ctxt->loc_llcd, ctxt);
 205                 mutex_down(&ctxt->loc_sem);
 206                 if (ctxt->loc_llcd != NULL) {
 207                         llcd_put(ctxt->loc_llcd);
 208                         ctxt->loc_llcd = NULL;
 209                 }
 210                 ctxt->loc_imp = NULL;
 211                 mutex_up(&ctxt->loc_sem);
 212         } else {
 213                 rc = llog_cancel(ctxt, NULL, 0, NULL, OBD_LLOG_FL_SENDNOW);
 214         }
 215
 216         RETURN(rc);
 217 }
 218 EXPORT_SYMBOL(llog_obd_repl_sync);
 219
 220 static void llog_lcm_dec(struct llog_commit_master *lcm)
 221 {
 222         atomic_dec(&lcm->lcm_thread_total);
 223         cfs_waitq_signal(&lcm->lcm_waitq);
 224 }
 225
 226 static int log_commit_thread(void *arg)
 227 {
 228         struct llog_commit_daemon *lcd = arg;
 229         struct llog_commit_master *lcm = lcd->lcd_lcm;
 230         struct llog_canceld_ctxt *llcd, *n;
 231         struct obd_import *import = NULL;
 232         ENTRY;
 233
 234         THREAD_NAME(cfs_curproc_comm(), CFS_CURPROC_COMM_MAX - 1,
 235                     "ll_log_comt_%02d", lcd->lcd_index);
 236
 237         ptlrpc_daemonize(cfs_curproc_comm()); /* thread never needs to do IO */
 238         CDEBUG(D_HA, "%s started\n", cfs_curproc_comm());
 239
 240         do {
 241                 struct ptlrpc_request *request;
 242                 struct list_head *sending_list;
 243                 int rc = 0;
 244
 245                 if (import)
 246                         class_import_put(import);
 247                 import = NULL;
 248
 249                 /* If we do not have enough pages available, allocate some */
 250                 while (atomic_read(&lcm->lcm_llcd_numfree) <
 251                        lcm->lcm_llcd_minfree) {
 252                         if (llcd_alloc(lcm) < 0)
 253                                 break;
 254                 }
 255
 256                 spin_lock(&lcm->lcm_thread_lock);
 257                 atomic_inc(&lcm->lcm_thread_numidle);
 258                 list_move(&lcd->lcd_lcm_list, &lcm->lcm_thread_idle);
 259                 spin_unlock(&lcm->lcm_thread_lock);
 260
 261                 wait_event_interruptible(lcm->lcm_waitq,
 262                                          !list_empty(&lcm->lcm_llcd_pending) ||
 263                                          lcm->lcm_flags & LLOG_LCM_FL_EXIT);
 264
 265                 /* If we are the last available thread, start a new one in case
 266                  * we get blocked on an RPC (nobody else will start a new one)*/
 267                 spin_lock(&lcm->lcm_thread_lock);
 268                 atomic_dec(&lcm->lcm_thread_numidle);
 269                 list_move(&lcd->lcd_lcm_list, &lcm->lcm_thread_busy);
 270                 spin_unlock(&lcm->lcm_thread_lock);
 271
 272                 sending_list = &lcm->lcm_llcd_pending;
 273         resend:
 274                 if (import)
 275                         class_import_put(import);
 276                 import = NULL;
 277                 if (lcm->lcm_flags & LLOG_LCM_FL_EXIT) {
 278                         lcm->lcm_llcd_maxfree = 0;
 279                         lcm->lcm_llcd_minfree = 0;
 280                         lcm->lcm_thread_max = 0;
 281
 282                         if (list_empty(&lcm->lcm_llcd_pending) ||
 283                             lcm->lcm_flags & LLOG_LCM_FL_EXIT_FORCE)
 284                                 break;
 285                 }
 286
 287                 if (atomic_read(&lcm->lcm_thread_numidle) <= 1 &&
 288                     atomic_read(&lcm->lcm_thread_total) < lcm->lcm_thread_max) {
 289                         rc = llog_start_commit_thread(lcm);
 290                         if (rc < 0)
 291                                 CERROR("error starting thread: rc %d\n", rc);
 292                 }
 293
 294                 /* Move all of the pending cancels from the same OST off of
 295                  * the list, so we don't get multiple threads blocked and/or
 296                  * doing upcalls on the same OST in case of failure. */
 297                 spin_lock(&lcm->lcm_llcd_lock);
 298                 if (!list_empty(sending_list)) {
 299                         list_move_tail(sending_list->next,
 300                                        &lcd->lcd_llcd_list);
 301                         llcd = list_entry(lcd->lcd_llcd_list.next,
 302                                           typeof(*llcd), llcd_list);
 303                         LASSERT(llcd->llcd_lcm == lcm);
 304                         import = llcd->llcd_ctxt->loc_imp;
 305                         if (import)
 306                                 class_import_get(import);
 307                 }
 308                 list_for_each_entry_safe(llcd, n, sending_list, llcd_list) {
 309                         LASSERT(llcd->llcd_lcm == lcm);
 310                         if (import == llcd->llcd_ctxt->loc_imp)
 311                                 list_move_tail(&llcd->llcd_list,
 312                                                &lcd->lcd_llcd_list);
 313                 }
 314                 if (sending_list != &lcm->lcm_llcd_resend) {
 315                         list_for_each_entry_safe(llcd, n, &lcm->lcm_llcd_resend,
 316                                                  llcd_list) {
 317                                 LASSERT(llcd->llcd_lcm == lcm);
 318                                 if (import == llcd->llcd_ctxt->loc_imp)
 319                                         list_move_tail(&llcd->llcd_list,
 320                                                        &lcd->lcd_llcd_list);
 321                         }
 322                 }
 323                 spin_unlock(&lcm->lcm_llcd_lock);
 324
 325                 /* We are the only one manipulating our local list - no lock */
 326                 list_for_each_entry_safe(llcd,n, &lcd->lcd_llcd_list,llcd_list){
 327                         int size[2] = { sizeof(struct ptlrpc_body),
 328                                         llcd->llcd_cookiebytes };
 329                         char *bufs[2] = { NULL, (char *)llcd->llcd_cookies };
 330
 331                         list_del(&llcd->llcd_list);
 332                         if (llcd->llcd_cookiebytes == 0) {
 333                                 CDEBUG(D_RPCTRACE, "put empty llcd %p:%p\n",
 334                                        llcd, llcd->llcd_ctxt);
 335                                 llcd_put(llcd);
 336                                 continue;
 337                         }
 338
 339                         mutex_down(&llcd->llcd_ctxt->loc_sem);
 340                         if (llcd->llcd_ctxt->loc_imp == NULL) {
 341                                 mutex_up(&llcd->llcd_ctxt->loc_sem);
 342                                 CWARN("import will be destroyed, put "
 343                                       "llcd %p:%p\n", llcd, llcd->llcd_ctxt);
 344                                 llcd_put(llcd);
 345                                 continue;
 346                         }
 347                         mutex_up(&llcd->llcd_ctxt->loc_sem);
 348
 349                         if (!import || (import == LP_POISON) ||
 350                             (import->imp_client == LP_POISON)) {
 351                                 CERROR("No import %p (llcd=%p, ctxt=%p)\n",
 352                                        import, llcd, llcd->llcd_ctxt);
 353                                 llcd_put(llcd);
 354                                 continue;
 355                         }
 356
 357                         OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_RECOV, 10);
 358
 359                         request = ptlrpc_prep_req(import, LUSTRE_LOG_VERSION,
 360                                                   OBD_LOG_CANCEL, 2, size,bufs);
 361                         if (request == NULL) {
 362                                 rc = -ENOMEM;
 363                                 CERROR("error preparing commit: rc %d\n", rc);
 364
 365                                 spin_lock(&lcm->lcm_llcd_lock);
 366                                 list_splice(&lcd->lcd_llcd_list,
 367                                             &lcm->lcm_llcd_resend);
 368                                 CFS_INIT_LIST_HEAD(&lcd->lcd_llcd_list);
 369                                 spin_unlock(&lcm->lcm_llcd_lock);
 370                                 break;
 371                         }
 372
 373                         /* XXX FIXME bug 249, 5515 */
 374                         request->rq_request_portal = LDLM_CANCEL_REQUEST_PORTAL;
 375                         request->rq_reply_portal = LDLM_CANCEL_REPLY_PORTAL;
 376
 377                         ptlrpc_req_set_repsize(request, 1, NULL);
 378                         mutex_down(&llcd->llcd_ctxt->loc_sem);
 379                         if (llcd->llcd_ctxt->loc_imp == NULL) {
 380                                 mutex_up(&llcd->llcd_ctxt->loc_sem);
 381                                 CWARN("import will be destroyed, put "
 382                                       "llcd %p:%p\n", llcd, llcd->llcd_ctxt);
 383                                 llcd_put(llcd);
 384                                 ptlrpc_req_finished(request);
 385                                 continue;
 386                         }
 387                         mutex_up(&llcd->llcd_ctxt->loc_sem);
 388                         rc = ptlrpc_queue_wait(request);
 389                         ptlrpc_req_finished(request);
 390
 391                         /* If the RPC failed, we put this and the remaining
 392                          * messages onto the resend list for another time. */
 393                         if (rc == 0) {
 394                                 llcd_put(llcd);
 395                                 continue;
 396                         }
 397
 398                         CERROR("commit %p:%p drop %d cookies: rc %d\n",
 399                                llcd, llcd->llcd_ctxt,
 400                                (int)(llcd->llcd_cookiebytes /
 401                                      sizeof(*llcd->llcd_cookies)), rc);
 402                         llcd_put(llcd);
 403                 }
 404
 405                 if (rc == 0) {
 406                         sending_list = &lcm->lcm_llcd_resend;
 407                         if (!list_empty(sending_list))
 408                                 goto resend;
 409                 }
 410         } while(1);
 411
 412         if (import)
 413                 class_import_put(import);
 414
 415         /* If we are force exiting, just drop all of the cookies. */
 416         if (lcm->lcm_flags & LLOG_LCM_FL_EXIT_FORCE) {
 417                 spin_lock(&lcm->lcm_llcd_lock);
 418                 list_splice(&lcm->lcm_llcd_pending, &lcd->lcd_llcd_list);
 419                 list_splice(&lcm->lcm_llcd_resend, &lcd->lcd_llcd_list);
 420                 list_splice(&lcm->lcm_llcd_free, &lcd->lcd_llcd_list);
 421                 spin_unlock(&lcm->lcm_llcd_lock);
 422
 423                 list_for_each_entry_safe(llcd, n, &lcd->lcd_llcd_list,llcd_list)
 424                         llcd_put(llcd);
 425         }
 426
 427
 428         CDEBUG(D_HA, "%s exiting\n", cfs_curproc_comm());
 429
 430         spin_lock(&lcm->lcm_thread_lock);
 431         list_del(&lcd->lcd_lcm_list);
 432         spin_unlock(&lcm->lcm_thread_lock);
 433         OBD_FREE_PTR(lcd);
 434         llog_lcm_dec(lcm);
 435
 436         RETURN(0);
 437 }
 438
 439 int llog_start_commit_thread(struct llog_commit_master *lcm)
 440 {
 441         struct llog_commit_daemon *lcd;
 442         int rc, index;
 443         ENTRY;
 444
 445         if (atomic_read(&lcm->lcm_thread_total) >= lcm->lcm_thread_max)
 446                 RETURN(0);
 447
 448         /* Check whether it will be cleanup llog commit thread first,
 449          * If not, increate the lcm_thread_total count to prevent the
 450          * lcm being freed when the log_commit_thread is started */
 451         spin_lock(&lcm->lcm_thread_lock);
 452         if (!lcm->lcm_flags & LLOG_LCM_FL_EXIT) {
 453                 atomic_inc(&lcm->lcm_thread_total);
 454                 index = atomic_read(&lcm->lcm_thread_total);
 455                 spin_unlock(&lcm->lcm_thread_lock);
 456         } else {
 457                 spin_unlock(&lcm->lcm_thread_lock);
 458                 RETURN(0);
 459         }
 460
 461         OBD_ALLOC_PTR(lcd);
 462         if (lcd == NULL)
 463                 GOTO(cleanup, rc = -ENOMEM);
 464
 465         CFS_INIT_LIST_HEAD(&lcd->lcd_lcm_list);
 466         CFS_INIT_LIST_HEAD(&lcd->lcd_llcd_list);
 467         lcd->lcd_index = index;
 468         lcd->lcd_lcm = lcm;
 469
 470         rc = cfs_kernel_thread(log_commit_thread, lcd, CLONE_VM | CLONE_FILES);
 471 cleanup:
 472         if (rc < 0) {
 473                 CERROR("error starting thread #%d: %d\n", lcd->lcd_index, rc);
 474                 llog_lcm_dec(lcm);
 475                 if (lcd)
 476                         OBD_FREE_PTR(lcd);
 477                 RETURN(rc);
 478         }
 479         RETURN(0);
 480 }
 481 EXPORT_SYMBOL(llog_start_commit_thread);
 482
 483 static struct llog_process_args {
 484         struct semaphore         llpa_sem;
 485         struct llog_ctxt        *llpa_ctxt;
 486         void                    *llpa_cb;
 487         void                    *llpa_arg;
 488 } llpa;
 489
 490 int llog_init_commit_master(struct llog_commit_master *lcm)
 491 {
 492         CFS_INIT_LIST_HEAD(&lcm->lcm_thread_busy);
 493         CFS_INIT_LIST_HEAD(&lcm->lcm_thread_idle);
 494         spin_lock_init(&lcm->lcm_thread_lock);
 495         atomic_set(&lcm->lcm_thread_numidle, 0);
 496         cfs_waitq_init(&lcm->lcm_waitq);
 497         CFS_INIT_LIST_HEAD(&lcm->lcm_llcd_pending);
 498         CFS_INIT_LIST_HEAD(&lcm->lcm_llcd_resend);
 499         CFS_INIT_LIST_HEAD(&lcm->lcm_llcd_free);
 500         spin_lock_init(&lcm->lcm_llcd_lock);
 501         atomic_set(&lcm->lcm_llcd_numfree, 0);
 502         lcm->lcm_llcd_minfree = 0;
 503         lcm->lcm_thread_max = 5;
 504         /* FIXME initialize semaphore for llog_process_args */
 505         sema_init(&llpa.llpa_sem, 1);
 506         return 0;
 507 }
 508 EXPORT_SYMBOL(llog_init_commit_master);
 509
 510 int llog_cleanup_commit_master(struct llog_commit_master *lcm,
 511                                int force)
 512 {
 513         spin_lock(&lcm->lcm_thread_lock);
 514         lcm->lcm_flags |= LLOG_LCM_FL_EXIT;
 515         if (force)
 516                 lcm->lcm_flags |= LLOG_LCM_FL_EXIT_FORCE;
 517
 518         spin_unlock(&lcm->lcm_thread_lock);
 519
 520         cfs_waitq_signal(&lcm->lcm_waitq);
 521
 522         wait_event_interruptible(lcm->lcm_waitq,
 523                                  atomic_read(&lcm->lcm_thread_total) == 0);
 524         return 0;
 525 }
 526 EXPORT_SYMBOL(llog_cleanup_commit_master);
 527
 528 static int log_process_thread(void *args)
 529 {
 530         struct llog_process_args *data = args;
 531         struct llog_ctxt *ctxt = data->llpa_ctxt;
 532         void   *cb = data->llpa_cb;
 533         struct llog_logid logid = *(struct llog_logid *)(data->llpa_arg);
 534         struct llog_handle *llh = NULL;
 535         int rc;
 536         ENTRY;
 537
 538         mutex_up(&data->llpa_sem);
 539         ptlrpc_daemonize("llog_process");     /* thread does IO to log files */
 540
 541         rc = llog_create(ctxt, &llh, &logid, NULL);
 542         if (rc) {
 543                 CERROR("llog_create failed %d\n", rc);
 544                 GOTO(out, rc);
 545         }
 546         rc = llog_init_handle(llh, LLOG_F_IS_CAT, NULL);
 547         if (rc) {
 548                 CERROR("llog_init_handle failed %d\n", rc);
 549                 GOTO(release_llh, rc);
 550         }
 551
 552         if (cb) {
 553                 rc = llog_cat_process(llh, (llog_cb_t)cb, NULL);
 554                 if (rc != LLOG_PROC_BREAK)
 555                         CERROR("llog_cat_process failed %d\n", rc);
 556         } else {
 557                 CWARN("no callback function for recovery\n");
 558         }
 559
 560         CDEBUG(D_HA, "send llcd %p:%p forcibly after recovery\n",
 561                ctxt->loc_llcd, ctxt);
 562         llog_sync(ctxt, NULL);
 563
 564 release_llh:
 565         rc = llog_cat_put(llh);
 566         if (rc)
 567                 CERROR("llog_cat_put failed %d\n", rc);
 568 out:
 569         llog_ctxt_put(ctxt);
 570         RETURN(rc);
 571 }
 572
 573 static int llog_recovery_generic(struct llog_ctxt *ctxt, void *handle,void *arg)
 574 {
 575         struct obd_device *obd = ctxt->loc_obd;
 576         int rc;
 577         ENTRY;
 578
 579         if (obd->obd_stopping)
 580                 RETURN(-ENODEV);
 581
 582         mutex_down(&llpa.llpa_sem);
 583         llpa.llpa_cb = handle;
 584         llpa.llpa_arg = arg;
 585         llpa.llpa_ctxt = llog_get_context(ctxt->loc_obd, ctxt->loc_idx);
 586         if (!llpa.llpa_ctxt) {
 587                 up(&llpa.llpa_sem);
 588                 RETURN(-ENODEV);
 589         }
 590         rc = cfs_kernel_thread(log_process_thread, &llpa, CLONE_VM | CLONE_FILES);
 591         if (rc < 0)
 592                 CERROR("error starting log_process_thread: %d\n", rc);
 593         else {
 594                 CDEBUG(D_HA, "log_process_thread: %d\n", rc);
 595                 rc = 0;
 596         }
 597
 598         RETURN(rc);
 599 }
 600
 601 int llog_repl_connect(struct llog_ctxt *ctxt, int count,
 602                       struct llog_logid *logid, struct llog_gen *gen,
 603                       struct obd_uuid *uuid)
 604 {
 605         struct llog_canceld_ctxt *llcd;
 606         int rc;
 607         ENTRY;
 608
 609         /* send back llcd before recovery from llog */
 610         if (ctxt->loc_llcd != NULL) {
 611                 CWARN("llcd %p:%p not empty\n", ctxt->loc_llcd, ctxt);
 612                 llog_sync(ctxt, NULL);
 613         }
 614
 615         mutex_down(&ctxt->loc_sem);
 616         ctxt->loc_gen = *gen;
 617         llcd = llcd_grab(ctxt->loc_lcm);
 618         if (llcd == NULL) {
 619                 CERROR("couldn't get an llcd\n");
 620                 mutex_up(&ctxt->loc_sem);
 621                 RETURN(-ENOMEM);
 622         }
 623         llcd->llcd_ctxt = llog_ctxt_get(ctxt);
 624         ctxt->loc_llcd = llcd;
 625         mutex_up(&ctxt->loc_sem);
 626
 627         rc = llog_recovery_generic(ctxt, ctxt->llog_proc_cb, logid);
 628         if (rc != 0)
 629                 CERROR("error recovery process: %d\n", rc);
 630
 631         RETURN(rc);
 632 }
 633 EXPORT_SYMBOL(llog_repl_connect);
 634
 635 #else /* !__KERNEL__ */
 636
 637 int llog_obd_repl_cancel(struct llog_ctxt *ctxt,
 638                          struct lov_stripe_md *lsm, int count,
 639                          struct llog_cookie *cookies, int flags)
 640 {
 641         return 0;
 642 }
 643 #endif