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 <obd_class.h>
  46 #include <lustre_commit_confd.h>
  47 #include <obd_support.h>
  48 #include <obd_class.h>
  49 #include <lustre_net.h>
  50 #include <lnet/types.h>
  51 #include <libcfs/list.h>
  52 #include <lustre_log.h>
  53 #include "ptlrpc_internal.h"
  54
  55 #ifdef __KERNEL__
  56
  57 /* Allocate new commit structs in case we do not have enough.
  58  * Make the llcd size small enough that it fits into a single page when we
  59  * are sending/receiving it. */
  60 static int llcd_alloc(struct llog_commit_master *lcm)
  61 {
  62         struct llog_canceld_ctxt *llcd;
  63         int llcd_size;
  64
  65         /* payload of lustre_msg V2 is bigger */
  66         llcd_size = 4096 - lustre_msg_size(LUSTRE_MSG_MAGIC_V2, 1, NULL);
  67         OBD_ALLOC(llcd,
  68                   llcd_size + offsetof(struct llog_canceld_ctxt, llcd_cookies));
  69         if (llcd == NULL)
  70                 return -ENOMEM;
  71
  72         llcd->llcd_size = llcd_size;
  73         llcd->llcd_lcm = lcm;
  74
  75         spin_lock(&lcm->lcm_llcd_lock);
  76         list_add(&llcd->llcd_list, &lcm->lcm_llcd_free);
  77         atomic_inc(&lcm->lcm_llcd_numfree);
  78         spin_unlock(&lcm->lcm_llcd_lock);
  79
  80         return 0;
  81 }
  82
  83 /* Get a free cookie struct from the list */
  84 static struct llog_canceld_ctxt *llcd_grab(struct llog_commit_master *lcm)
  85 {
  86         struct llog_canceld_ctxt *llcd;
  87
  88 repeat:
  89         spin_lock(&lcm->lcm_llcd_lock);
  90         if (list_empty(&lcm->lcm_llcd_free)) {
  91                 spin_unlock(&lcm->lcm_llcd_lock);
  92                 if (llcd_alloc(lcm) < 0) {
  93                         CERROR("unable to allocate log commit data!\n");
  94                         return NULL;
  95                 }
  96                 /* check new llcd wasn't grabbed while lock dropped, b=7407 */
  97                 goto repeat;
  98         }
  99
 100         llcd = list_entry(lcm->lcm_llcd_free.next, typeof(*llcd), llcd_list);
 101         list_del(&llcd->llcd_list);
 102         atomic_dec(&lcm->lcm_llcd_numfree);
 103         spin_unlock(&lcm->lcm_llcd_lock);
 104
 105         llcd->llcd_cookiebytes = 0;
 106
 107         return llcd;
 108 }
 109
 110 static void llcd_put(struct llog_canceld_ctxt *llcd)
 111 {
 112         struct llog_commit_master *lcm = llcd->llcd_lcm;
 113
 114         llog_ctxt_put(llcd->llcd_ctxt);
 115         if (atomic_read(&lcm->lcm_llcd_numfree) >= lcm->lcm_llcd_maxfree) {
 116                 int llcd_size = llcd->llcd_size +
 117                          offsetof(struct llog_canceld_ctxt, llcd_cookies);
 118                 OBD_FREE(llcd, llcd_size);
 119         } else {
 120                 spin_lock(&lcm->lcm_llcd_lock);
 121                 list_add(&llcd->llcd_list, &lcm->lcm_llcd_free);
 122                 atomic_inc(&lcm->lcm_llcd_numfree);
 123                 spin_unlock(&lcm->lcm_llcd_lock);
 124         }
 125 }
 126
 127 /* Send some cookies to the appropriate target */
 128 static void llcd_send(struct llog_canceld_ctxt *llcd)
 129 {
 130         if (!(llcd->llcd_lcm->lcm_flags & LLOG_LCM_FL_EXIT)) {
 131                 spin_lock(&llcd->llcd_lcm->lcm_llcd_lock);
 132                 list_add_tail(&llcd->llcd_list,
 133                               &llcd->llcd_lcm->lcm_llcd_pending);
 134                 spin_unlock(&llcd->llcd_lcm->lcm_llcd_lock);
 135         }
 136         cfs_waitq_signal_nr(&llcd->llcd_lcm->lcm_waitq, 1);
 137 }
 138
 139 /**
 140  * Grab llcd and assign it to passed @ctxt. Also set up backward link
 141  * and get ref on @ctxt.
 142  */
 143 static struct llog_canceld_ctxt *ctxt_llcd_grab(struct llog_ctxt *ctxt)
 144 {
 145         struct llog_canceld_ctxt *llcd;
 146
 147         LASSERT_SEM_LOCKED(&ctxt->loc_sem);
 148         llcd = llcd_grab(ctxt->loc_lcm);
 149         if (llcd == NULL)
 150                 return NULL;
 151
 152         llcd->llcd_ctxt = llog_ctxt_get(ctxt);
 153         ctxt->loc_llcd = llcd;
 154
 155         CDEBUG(D_RPCTRACE,"grab llcd %p:%p\n", ctxt->loc_llcd, ctxt);
 156         return llcd;
 157 }
 158
 159 /**
 160  * Put llcd in passed @ctxt. Set ->loc_llcd to NULL.
 161  */
 162 static void ctxt_llcd_put(struct llog_ctxt *ctxt)
 163 {
 164         mutex_down(&ctxt->loc_sem);
 165         if (ctxt->loc_llcd != NULL) {
 166                 CDEBUG(D_RPCTRACE,"put llcd %p:%p\n", ctxt->loc_llcd, ctxt);
 167                 llcd_put(ctxt->loc_llcd);
 168                 ctxt->loc_llcd = NULL;
 169         }
 170         class_import_put(ctxt->loc_imp);
 171         ctxt->loc_imp = NULL;
 172         mutex_up(&ctxt->loc_sem);
 173 }
 174
 175 /* deleted objects have a commit callback that cancels the MDS
 176  * log record for the deletion.  The commit callback calls this
 177  * function
 178  */
 179 int llog_obd_repl_cancel(struct llog_ctxt *ctxt,
 180                          struct lov_stripe_md *lsm, int count,
 181                          struct llog_cookie *cookies, int flags)
 182 {
 183         struct llog_canceld_ctxt *llcd;
 184         int rc = 0;
 185         ENTRY;
 186
 187         LASSERT(ctxt);
 188
 189         mutex_down(&ctxt->loc_sem);
 190         llcd = ctxt->loc_llcd;
 191
 192         if (ctxt->loc_imp == NULL) {
 193                 CDEBUG(D_RPCTRACE, "no import for ctxt %p\n", ctxt);
 194                 GOTO(out, rc = 0);
 195         }
 196
 197         if (count > 0 && cookies != NULL) {
 198                 if (llcd == NULL) {
 199                         llcd = ctxt_llcd_grab(ctxt);
 200                         if (llcd == NULL) {
 201                                 CERROR("couldn't get an llcd - dropped "LPX64
 202                                        ":%x+%u\n",
 203                                        cookies->lgc_lgl.lgl_oid,
 204                                        cookies->lgc_lgl.lgl_ogen,
 205                                        cookies->lgc_index);
 206                                 GOTO(out, rc = -ENOMEM);
 207                         }
 208                 }
 209
 210                 memcpy((char *)llcd->llcd_cookies + llcd->llcd_cookiebytes,
 211                        cookies, sizeof(*cookies));
 212                 llcd->llcd_cookiebytes += sizeof(*cookies);
 213         } else {
 214                 if (llcd == NULL || !(flags & OBD_LLOG_FL_SENDNOW))
 215                         GOTO(out, rc);
 216         }
 217
 218         if ((llcd->llcd_size - llcd->llcd_cookiebytes) < sizeof(*cookies) ||
 219             (flags & OBD_LLOG_FL_SENDNOW)) {
 220                 CDEBUG(D_RPCTRACE, "send llcd %p:%p\n", llcd, llcd->llcd_ctxt);
 221                 ctxt->loc_llcd = NULL;
 222                 llcd_send(llcd);
 223         }
 224 out:
 225         mutex_up(&ctxt->loc_sem);
 226         return rc;
 227 }
 228 EXPORT_SYMBOL(llog_obd_repl_cancel);
 229
 230 int llog_obd_repl_sync(struct llog_ctxt *ctxt, struct obd_export *exp)
 231 {
 232         int rc = 0;
 233         ENTRY;
 234
 235         if (exp && (ctxt->loc_imp == exp->exp_imp_reverse)) {
 236                 CDEBUG(D_RPCTRACE,"reverse import disconnect\n");
 237                 /*
 238                  * We put llcd because it is not going to sending list and
 239                  * thus, its refc will not be handled. We will handle it here.
 240                  */
 241                 ctxt_llcd_put(ctxt);
 242         } else {
 243                 /*
 244                  * Sending cancel. This means that ctxt->loc_llcd wil be
 245                  * put on sending list in llog_obd_repl_cancel() and in
 246                  * this case recovery thread will take care of it refc.
 247                  */
 248                 rc = llog_cancel(ctxt, NULL, 0, NULL, OBD_LLOG_FL_SENDNOW);
 249         }
 250         RETURN(rc);
 251 }
 252 EXPORT_SYMBOL(llog_obd_repl_sync);
 253
 254 static inline void stop_log_commit(struct llog_commit_master *lcm,
 255                                    struct llog_commit_daemon *lcd,
 256                                    int rc)
 257 {
 258         CERROR("error preparing commit: rc %d\n", rc);
 259
 260         spin_lock(&lcm->lcm_llcd_lock);
 261         list_splice_init(&lcd->lcd_llcd_list, &lcm->lcm_llcd_resend);
 262         spin_unlock(&lcm->lcm_llcd_lock);
 263 }
 264
 265 static int log_commit_thread(void *arg)
 266 {
 267         struct llog_commit_master *lcm = arg;
 268         struct llog_commit_daemon *lcd;
 269         struct llog_canceld_ctxt *llcd, *n;
 270         struct obd_import *import = NULL;
 271         ENTRY;
 272
 273         OBD_ALLOC(lcd, sizeof(*lcd));
 274         if (lcd == NULL)
 275                 RETURN(-ENOMEM);
 276
 277         spin_lock(&lcm->lcm_thread_lock);
 278         THREAD_NAME(cfs_curproc_comm(), CFS_CURPROC_COMM_MAX - 1,
 279                     "ll_log_comt_%02d", atomic_read(&lcm->lcm_thread_total));
 280         atomic_inc(&lcm->lcm_thread_total);
 281         spin_unlock(&lcm->lcm_thread_lock);
 282
 283         ptlrpc_daemonize(cfs_curproc_comm()); /* thread never needs to do IO */
 284
 285         CFS_INIT_LIST_HEAD(&lcd->lcd_lcm_list);
 286         CFS_INIT_LIST_HEAD(&lcd->lcd_llcd_list);
 287         lcd->lcd_lcm = lcm;
 288
 289         CDEBUG(D_HA, "%s started\n", cfs_curproc_comm());
 290         do {
 291                 struct ptlrpc_request *request;
 292                 struct list_head *sending_list;
 293                 int rc = 0;
 294
 295                 if (import)
 296                         class_import_put(import);
 297                 import = NULL;
 298
 299                 /* If we do not have enough pages available, allocate some */
 300                 while (atomic_read(&lcm->lcm_llcd_numfree) <
 301                        lcm->lcm_llcd_minfree) {
 302                         if (llcd_alloc(lcm) < 0)
 303                                 break;
 304                 }
 305
 306                 spin_lock(&lcm->lcm_thread_lock);
 307                 atomic_inc(&lcm->lcm_thread_numidle);
 308                 list_move(&lcd->lcd_lcm_list, &lcm->lcm_thread_idle);
 309                 spin_unlock(&lcm->lcm_thread_lock);
 310
 311                 wait_event_interruptible(lcm->lcm_waitq,
 312                                          !list_empty(&lcm->lcm_llcd_pending) ||
 313                                          lcm->lcm_flags & LLOG_LCM_FL_EXIT);
 314
 315                 /* If we are the last available thread, start a new one in case
 316                  * we get blocked on an RPC (nobody else will start a new one)*/
 317                 spin_lock(&lcm->lcm_thread_lock);
 318                 atomic_dec(&lcm->lcm_thread_numidle);
 319                 list_move(&lcd->lcd_lcm_list, &lcm->lcm_thread_busy);
 320                 spin_unlock(&lcm->lcm_thread_lock);
 321
 322                 sending_list = &lcm->lcm_llcd_pending;
 323         resend:
 324                 if (import)
 325                         class_import_put(import);
 326                 import = NULL;
 327                 if (lcm->lcm_flags & LLOG_LCM_FL_EXIT) {
 328                         lcm->lcm_llcd_maxfree = 0;
 329                         lcm->lcm_llcd_minfree = 0;
 330                         lcm->lcm_thread_max = 0;
 331
 332                         if (list_empty(&lcm->lcm_llcd_pending) ||
 333                             lcm->lcm_flags & LLOG_LCM_FL_EXIT_FORCE)
 334                                 break;
 335                 }
 336
 337                 if (atomic_read(&lcm->lcm_thread_numidle) <= 1 &&
 338                     atomic_read(&lcm->lcm_thread_total) < lcm->lcm_thread_max) {
 339                         rc = llog_start_commit_thread(lcm);
 340                         if (rc < 0)
 341                                 CERROR("error starting thread: rc %d\n", rc);
 342                 }
 343
 344                 /* Move all of the pending cancels from the same OST off of
 345                  * the list, so we don't get multiple threads blocked and/or
 346                  * doing upcalls on the same OST in case of failure. */
 347                 spin_lock(&lcm->lcm_llcd_lock);
 348                 if (!list_empty(sending_list)) {
 349                         list_move_tail(sending_list->next,
 350                                        &lcd->lcd_llcd_list);
 351                         llcd = list_entry(lcd->lcd_llcd_list.next,
 352                                           typeof(*llcd), llcd_list);
 353                         LASSERT(llcd->llcd_lcm == lcm);
 354                         import = llcd->llcd_ctxt->loc_imp;
 355                         if (import)
 356                                 class_import_get(import);
 357                 }
 358                 list_for_each_entry_safe(llcd, n, sending_list, llcd_list) {
 359                         LASSERT(llcd->llcd_lcm == lcm);
 360                         if (import == llcd->llcd_ctxt->loc_imp)
 361                                 list_move_tail(&llcd->llcd_list,
 362                                                &lcd->lcd_llcd_list);
 363                 }
 364                 if (sending_list != &lcm->lcm_llcd_resend) {
 365                         list_for_each_entry_safe(llcd, n, &lcm->lcm_llcd_resend,
 366                                                  llcd_list) {
 367                                 LASSERT(llcd->llcd_lcm == lcm);
 368                                 if (import == llcd->llcd_ctxt->loc_imp)
 369                                         list_move_tail(&llcd->llcd_list,
 370                                                        &lcd->lcd_llcd_list);
 371                         }
 372                 }
 373                 spin_unlock(&lcm->lcm_llcd_lock);
 374
 375                 /* We are the only one manipulating our local list - no lock */
 376                 list_for_each_entry_safe(llcd,n, &lcd->lcd_llcd_list,llcd_list){
 377                         char *bufs[2] = { NULL, (char *)llcd->llcd_cookies };
 378
 379                         list_del(&llcd->llcd_list);
 380                         if (llcd->llcd_cookiebytes == 0) {
 381                                 CDEBUG(D_RPCTRACE, "put empty llcd %p:%p\n",
 382                                        llcd, llcd->llcd_ctxt);
 383                                 llcd_put(llcd);
 384                                 continue;
 385                         }
 386
 387                         mutex_down(&llcd->llcd_ctxt->loc_sem);
 388                         if (llcd->llcd_ctxt->loc_imp == NULL) {
 389                                 mutex_up(&llcd->llcd_ctxt->loc_sem);
 390                                 CWARN("import will be destroyed, put "
 391                                       "llcd %p:%p\n", llcd, llcd->llcd_ctxt);
 392                                 llcd_put(llcd);
 393                                 continue;
 394                         }
 395                         mutex_up(&llcd->llcd_ctxt->loc_sem);
 396
 397                         if (!import || (import == LP_POISON) ||
 398                             (import->imp_client == LP_POISON)) {
 399                                 CERROR("No import %p (llcd=%p, ctxt=%p)\n",
 400                                        import, llcd, llcd->llcd_ctxt);
 401                                 llcd_put(llcd);
 402                                 continue;
 403                         }
 404
 405                         OBD_FAIL_TIMEOUT(OBD_FAIL_PTLRPC_DELAY_RECOV, 10);
 406
 407                         request = ptlrpc_request_alloc(import, &RQF_LOG_CANCEL);
 408                         if (request == NULL) {
 409                                 rc = -ENOMEM;
 410                                 stop_log_commit(lcm, lcd, rc);
 411                                 break;
 412                         }
 413
 414                         req_capsule_set_size(&request->rq_pill, &RMF_LOGCOOKIES,
 415                                              RCL_CLIENT,llcd->llcd_cookiebytes);
 416
 417                         rc = ptlrpc_request_bufs_pack(request,
 418                                                       LUSTRE_LOG_VERSION,
 419                                                       OBD_LOG_CANCEL, bufs,
 420                                                       NULL);
 421                         if (rc) {
 422                                 ptlrpc_request_free(request);
 423                                 stop_log_commit(lcm, lcd, rc);
 424                                 break;
 425                         }
 426
 427                         /* XXX FIXME bug 249, 5515 */
 428                         request->rq_request_portal = LDLM_CANCEL_REQUEST_PORTAL;
 429                         request->rq_reply_portal = LDLM_CANCEL_REPLY_PORTAL;
 430
 431                         ptlrpc_request_set_replen(request);
 432                         mutex_down(&llcd->llcd_ctxt->loc_sem);
 433                         if (llcd->llcd_ctxt->loc_imp == NULL) {
 434                                 mutex_up(&llcd->llcd_ctxt->loc_sem);
 435                                 CWARN("import will be destroyed, put "
 436                                       "llcd %p:%p\n", llcd, llcd->llcd_ctxt);
 437                                 llcd_put(llcd);
 438                                 ptlrpc_req_finished(request);
 439                                 continue;
 440                         }
 441                         mutex_up(&llcd->llcd_ctxt->loc_sem);
 442                         rc = ptlrpc_queue_wait(request);
 443                         ptlrpc_req_finished(request);
 444
 445                         /* If the RPC failed, we put this and the remaining
 446                          * messages onto the resend list for another time. */
 447                         if (rc == 0) {
 448                                 llcd_put(llcd);
 449                                 continue;
 450                         }
 451
 452                         CERROR("commit %p:%p drop %d cookies: rc %d\n",
 453                                llcd, llcd->llcd_ctxt,
 454                                (int)(llcd->llcd_cookiebytes /
 455                                      sizeof(*llcd->llcd_cookies)), rc);
 456                         llcd_put(llcd);
 457                 }
 458
 459                 if (rc == 0) {
 460                         sending_list = &lcm->lcm_llcd_resend;
 461                         if (!list_empty(sending_list))
 462                                 goto resend;
 463                 }
 464         } while(1);
 465
 466         if (import)
 467                 class_import_put(import);
 468
 469         /* If we are force exiting, just drop all of the cookies. */
 470         if (lcm->lcm_flags & LLOG_LCM_FL_EXIT_FORCE) {
 471                 spin_lock(&lcm->lcm_llcd_lock);
 472                 list_splice_init(&lcm->lcm_llcd_pending, &lcd->lcd_llcd_list);
 473                 list_splice_init(&lcm->lcm_llcd_resend, &lcd->lcd_llcd_list);
 474                 list_splice_init(&lcm->lcm_llcd_free, &lcd->lcd_llcd_list);
 475                 spin_unlock(&lcm->lcm_llcd_lock);
 476
 477                 list_for_each_entry_safe(llcd, n, &lcd->lcd_llcd_list,llcd_list)
 478                         llcd_put(llcd);
 479         }
 480
 481         spin_lock(&lcm->lcm_thread_lock);
 482         list_del(&lcd->lcd_lcm_list);
 483         spin_unlock(&lcm->lcm_thread_lock);
 484         OBD_FREE(lcd, sizeof(*lcd));
 485
 486         CDEBUG(D_HA, "%s exiting\n", cfs_curproc_comm());
 487
 488         spin_lock(&lcm->lcm_thread_lock);
 489         atomic_dec(&lcm->lcm_thread_total);
 490         spin_unlock(&lcm->lcm_thread_lock);
 491         cfs_waitq_signal(&lcm->lcm_waitq);
 492
 493         return 0;
 494 }
 495
 496 int llog_start_commit_thread(struct llog_commit_master *lcm)
 497 {
 498         int rc;
 499         ENTRY;
 500
 501         if (atomic_read(&lcm->lcm_thread_total) >= lcm->lcm_thread_max)
 502                 RETURN(0);
 503
 504         rc = cfs_kernel_thread(log_commit_thread, lcm, CLONE_VM | CLONE_FILES);
 505         if (rc < 0) {
 506                 CERROR("error starting thread #%d: %d\n",
 507                        atomic_read(&lcm->lcm_thread_total), rc);
 508                 RETURN(rc);
 509         }
 510
 511         RETURN(0);
 512 }
 513 EXPORT_SYMBOL(llog_start_commit_thread);
 514
 515 static struct llog_process_args {
 516         struct semaphore         llpa_sem;
 517         struct llog_ctxt        *llpa_ctxt;
 518         void                    *llpa_cb;
 519         void                    *llpa_arg;
 520 } llpa;
 521
 522 int llog_init_commit_master(struct llog_commit_master *lcm)
 523 {
 524         CFS_INIT_LIST_HEAD(&lcm->lcm_thread_busy);
 525         CFS_INIT_LIST_HEAD(&lcm->lcm_thread_idle);
 526         spin_lock_init(&lcm->lcm_thread_lock);
 527         atomic_set(&lcm->lcm_thread_numidle, 0);
 528         cfs_waitq_init(&lcm->lcm_waitq);
 529         CFS_INIT_LIST_HEAD(&lcm->lcm_llcd_pending);
 530         CFS_INIT_LIST_HEAD(&lcm->lcm_llcd_resend);
 531         CFS_INIT_LIST_HEAD(&lcm->lcm_llcd_free);
 532         spin_lock_init(&lcm->lcm_llcd_lock);
 533         atomic_set(&lcm->lcm_llcd_numfree, 0);
 534         lcm->lcm_llcd_minfree = 0;
 535         lcm->lcm_thread_max = 5;
 536         /* FIXME initialize semaphore for llog_process_args */
 537         sema_init(&llpa.llpa_sem, 1);
 538         return 0;
 539 }
 540 EXPORT_SYMBOL(llog_init_commit_master);
 541
 542 int llog_cleanup_commit_master(struct llog_commit_master *lcm,
 543                                int force)
 544 {
 545         lcm->lcm_flags |= LLOG_LCM_FL_EXIT;
 546         if (force)
 547                 lcm->lcm_flags |= LLOG_LCM_FL_EXIT_FORCE;
 548         cfs_waitq_signal(&lcm->lcm_waitq);
 549
 550         wait_event_interruptible(lcm->lcm_waitq,
 551                                  atomic_read(&lcm->lcm_thread_total) == 0);
 552         return 0;
 553 }
 554 EXPORT_SYMBOL(llog_cleanup_commit_master);
 555
 556 static int log_process_thread(void *args)
 557 {
 558         struct llog_process_args *data = args;
 559         struct llog_ctxt *ctxt = data->llpa_ctxt;
 560         void   *cb = data->llpa_cb;
 561         struct llog_logid logid = *(struct llog_logid *)(data->llpa_arg);
 562         struct llog_handle *llh = NULL;
 563         int rc;
 564         ENTRY;
 565
 566         mutex_up(&data->llpa_sem);
 567         ptlrpc_daemonize("llog_process");     /* thread does IO to log files */
 568
 569         rc = llog_create(ctxt, &llh, &logid, NULL);
 570         if (rc) {
 571                 CERROR("llog_create failed %d\n", rc);
 572                 GOTO(out, rc);
 573         }
 574         rc = llog_init_handle(llh, LLOG_F_IS_CAT, NULL);
 575         if (rc) {
 576                 CERROR("llog_init_handle failed %d\n", rc);
 577                 GOTO(release_llh, rc);
 578         }
 579
 580         if (cb) {
 581                 rc = llog_cat_process(llh, (llog_cb_t)cb, NULL);
 582                 if (rc != LLOG_PROC_BREAK)
 583                         CERROR("llog_cat_process failed %d\n", rc);
 584         } else {
 585                 CWARN("no callback function for recovery\n");
 586         }
 587
 588         CDEBUG(D_HA, "send llcd %p:%p forcibly after recovery\n",
 589                ctxt->loc_llcd, ctxt);
 590         llog_sync(ctxt, NULL);
 591
 592 release_llh:
 593         rc = llog_cat_put(llh);
 594         if (rc)
 595                 CERROR("llog_cat_put failed %d\n", rc);
 596 out:
 597         llog_ctxt_put(ctxt);
 598         RETURN(rc);
 599 }
 600
 601 static int llog_recovery_generic(struct llog_ctxt *ctxt, void *handle,void *arg)
 602 {
 603         struct obd_device *obd = ctxt->loc_obd;
 604         int rc;
 605         ENTRY;
 606
 607         if (obd->obd_stopping)
 608                 RETURN(-ENODEV);
 609
 610         mutex_down(&llpa.llpa_sem);
 611         llpa.llpa_cb = handle;
 612         llpa.llpa_arg = arg;
 613         llpa.llpa_ctxt = llog_ctxt_get(ctxt);
 614         if (!llpa.llpa_ctxt) {
 615                 up(&llpa.llpa_sem);
 616                 RETURN(-ENODEV);
 617         }
 618         rc = cfs_kernel_thread(log_process_thread, &llpa, CLONE_VM | CLONE_FILES);
 619         if (rc < 0) {
 620                 llog_ctxt_put(ctxt);
 621                 CERROR("error starting log_process_thread: %d\n", rc);
 622         } else {
 623                 CDEBUG(D_HA, "log_process_thread: %d\n", rc);
 624                 rc = 0;
 625         }
 626
 627         RETURN(rc);
 628 }
 629
 630 int llog_repl_connect(struct llog_ctxt *ctxt, int count,
 631                       struct llog_logid *logid, struct llog_gen *gen,
 632                       struct obd_uuid *uuid)
 633 {
 634         struct llog_canceld_ctxt *llcd;
 635         int rc;
 636         ENTRY;
 637
 638         /* send back llcd before recovery from llog */
 639         if (ctxt->loc_llcd != NULL) {
 640                 CWARN("llcd %p:%p not empty\n", ctxt->loc_llcd, ctxt);
 641                 llog_sync(ctxt, NULL);
 642         }
 643
 644         mutex_down(&ctxt->loc_sem);
 645         ctxt->loc_gen = *gen;
 646         llcd = ctxt_llcd_grab(ctxt);
 647         if (llcd == NULL) {
 648                 CERROR("couldn't get an llcd\n");
 649                 mutex_up(&ctxt->loc_sem);
 650                 RETURN(-ENOMEM);
 651         }
 652         mutex_up(&ctxt->loc_sem);
 653
 654         rc = llog_recovery_generic(ctxt, ctxt->llog_proc_cb, logid);
 655         if (rc != 0) {
 656                 ctxt_llcd_put(ctxt);
 657                 CERROR("error recovery process: %d\n", rc);
 658         }
 659         RETURN(rc);
 660 }
 661 EXPORT_SYMBOL(llog_repl_connect);
 662
 663 #else /* !__KERNEL__ */
 664
 665 int llog_obd_repl_cancel(struct llog_ctxt *ctxt,
 666                          struct lov_stripe_md *lsm, int count,
 667                          struct llog_cookie *cookies, int flags)
 668 {
 669         return 0;
 670 }
 671 #endif