lustre/target/update_recovery.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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2014, 2015, Intel Corporation.
  24  */
  25
  26 /*
  27  * lustre/target/update_recovery.c
  28  *
  29  * This file implement the methods to handle the update recovery.
  30  *
  31  * During DNE recovery, the recovery thread will redo the operation according
  32  * to the transaction no, and these replay are either from client replay req
  33  * or update replay records(for distribute transaction) in the update log.
  34  * For distribute transaction replay, the replay thread will call
  35  * distribute_txn_replay_handle() to handle the updates.
  36  *
  37  * After the Master MDT restarts, it will retrieve the update records from all
  38  * of MDTs, for each distributed operation, it will check updates on all MDTs,
  39  * if some updates records are missing on some MDTs, the replay thread will redo
  40  * updates on these MDTs.
  41  *
  42  * Author: Di Wang <di.wang@intel.com>
  43  */
  44 #define DEBUG_SUBSYSTEM S_CLASS
  45
  46 #include <lu_target.h>
  47 #include <lustre_obdo.h>
  48 #include <lustre_update.h>
  49 #include <lustre_swab.h>
  50 #include <md_object.h>
  51 #include <obd.h>
  52 #include <obd_class.h>
  53
  54 #include "tgt_internal.h"
  55
  56 /**
  57  * Lookup distribute_txn_replay req
  58  *
  59  * Lookup distribute_txn_replay in the replay list by batchid.
  60  * It is assumed the list has been locked before calling this function.
  61  *
  62  * \param[in] tdtd      distribute_txn_data, which holds the replay
  63  *                      list.
  64  * \param[in] batchid   batchid used by lookup.
  65  *
  66  * \retval              pointer of the replay if succeeds.
  67  * \retval              NULL if can not find it.
  68  */
  69 static struct distribute_txn_replay_req *
  70 dtrq_lookup(struct target_distribute_txn_data *tdtd, __u64 batchid)
  71 {
  72         struct distribute_txn_replay_req        *tmp;
  73         struct distribute_txn_replay_req        *dtrq = NULL;
  74
  75         list_for_each_entry(tmp, &tdtd->tdtd_replay_list, dtrq_list) {
  76                 if (tmp->dtrq_batchid == batchid) {
  77                         dtrq = tmp;
  78                         break;
  79                 }
  80         }
  81         return dtrq;
  82 }
  83
  84 /**
  85  * insert distribute txn replay req
  86  *
  87  * Insert distribute txn replay to the replay list, and it assumes the
  88  * list has been looked. Note: the replay list is a sorted list, which
  89  * is sorted by master transno. It is assumed the replay list has been
  90  * locked before calling this function.
  91  *
  92  * \param[in] tdtd      target distribute txn data where replay list is
  93  * \param[in] new       distribute txn replay to be inserted
  94  *
  95  * \retval              0 if insertion succeeds
  96  * \retval              EEXIST if the dtrq already exists
  97  */
  98 static int dtrq_insert(struct target_distribute_txn_data *tdtd,
  99                         struct distribute_txn_replay_req *new)
 100 {
 101         struct distribute_txn_replay_req *iter;
 102
 103         /* Check if the dtrq has been added to the list */
 104         iter = dtrq_lookup(tdtd, new->dtrq_batchid);
 105         if (iter != NULL)
 106                 return -EEXIST;
 107
 108         list_for_each_entry_reverse(iter, &tdtd->tdtd_replay_list, dtrq_list) {
 109                 if (iter->dtrq_master_transno > new->dtrq_master_transno)
 110                         continue;
 111
 112                 /* If there are mulitple replay req with same transno, then
 113                  * sort them with batchid */
 114                 if (iter->dtrq_master_transno == new->dtrq_master_transno &&
 115                     iter->dtrq_batchid > new->dtrq_batchid)
 116                         continue;
 117
 118                 list_add(&new->dtrq_list, &iter->dtrq_list);
 119                 break;
 120         }
 121
 122         if (list_empty(&new->dtrq_list))
 123                 list_add(&new->dtrq_list, &tdtd->tdtd_replay_list);
 124
 125         return 0;
 126 }
 127
 128 /**
 129  * create distribute txn replay req
 130  *
 131  * Allocate distribute txn replay req according to the update records.
 132  *
 133  * \param[in] tdtd      target distribute txn data where replay list is.
 134  * \param[in] record    update records from the update log.
 135  *
 136  * \retval              the pointer of distribute txn replay req if
 137  *                      the creation succeeds.
 138  * \retval              NULL if the creation fails.
 139  */
 140 static struct distribute_txn_replay_req *
 141 dtrq_create(struct target_distribute_txn_data *tdtd,
 142             struct llog_update_record *lur)
 143 {
 144         struct distribute_txn_replay_req *new;
 145
 146         OBD_ALLOC_PTR(new);
 147         if (new == NULL)
 148                 RETURN(ERR_PTR(-ENOMEM));
 149
 150         new->dtrq_lur_size = llog_update_record_size(lur);
 151         OBD_ALLOC_LARGE(new->dtrq_lur, new->dtrq_lur_size);
 152         if (new->dtrq_lur == NULL) {
 153                 OBD_FREE_PTR(new);
 154                 RETURN(ERR_PTR(-ENOMEM));
 155         }
 156
 157         memcpy(new->dtrq_lur, lur, new->dtrq_lur_size);
 158
 159         /* If the transno in the update record is 0, it means the
 160          * update are from master MDT, and it will use the master
 161          * last committed transno as its master transno. Later, if
 162          * the update records are gotten from slave MDTs, then these
 163          * transno will be replaced.
 164          * See insert_update_records_to_replay_list(). */
 165         if (lur->lur_update_rec.ur_master_transno == 0) {
 166                 new->dtrq_lur->lur_update_rec.ur_master_transno =
 167                                 tdtd->tdtd_lut->lut_obd->obd_last_committed;
 168                 new->dtrq_master_transno =
 169                                 tdtd->tdtd_lut->lut_obd->obd_last_committed;
 170         } else {
 171                 new->dtrq_master_transno =
 172                                 lur->lur_update_rec.ur_master_transno;
 173         }
 174
 175         new->dtrq_batchid = lur->lur_update_rec.ur_batchid;
 176
 177         spin_lock_init(&new->dtrq_sub_list_lock);
 178         INIT_LIST_HEAD(&new->dtrq_sub_list);
 179         INIT_LIST_HEAD(&new->dtrq_list);
 180
 181         RETURN(new);
 182 }
 183
 184 /**
 185  * Lookup distribute sub replay
 186  *
 187  * Lookup distribute sub replay in the sub list of distribute_txn_replay by
 188  * mdt_index.
 189  *
 190  * \param[in] distribute_txn_replay_req the distribute txn replay req to lookup
 191  * \param[in] mdt_index                 the mdt_index as the key of lookup
 192  *
 193  * \retval              the pointer of sub replay if it can be found.
 194  * \retval              NULL if it can not find.
 195  */
 196 struct distribute_txn_replay_req_sub *
 197 dtrq_sub_lookup(struct distribute_txn_replay_req *dtrq, __u32 mdt_index)
 198 {
 199         struct distribute_txn_replay_req_sub *dtrqs = NULL;
 200         struct distribute_txn_replay_req_sub *tmp;
 201
 202         list_for_each_entry(tmp, &dtrq->dtrq_sub_list, dtrqs_list) {
 203                 if (tmp->dtrqs_mdt_index == mdt_index) {
 204                         dtrqs = tmp;
 205                         break;
 206                 }
 207         }
 208         return dtrqs;
 209 }
 210
 211 /**
 212  * Try to add cookie to sub distribute txn request
 213  *
 214  * Check if the update log cookie has been added to the request, if not,
 215  * add it to the dtrqs_cookie_list.
 216  *
 217  * \param[in] dtrqs     sub replay req where cookies to be added.
 218  * \param[in] cookie    cookie to be added.
 219  *
 220  * \retval              0 if the cookie is adding succeeds.
 221  * \retval              negative errno if adding fails.
 222  */
 223 static int dtrq_sub_add_cookie(struct distribute_txn_replay_req_sub *dtrqs,
 224                                struct llog_cookie *cookie)
 225 {
 226         struct sub_thandle_cookie *new;
 227
 228         OBD_ALLOC_PTR(new);
 229         if (new == NULL)
 230                 return -ENOMEM;
 231
 232         INIT_LIST_HEAD(&new->stc_list);
 233         new->stc_cookie = *cookie;
 234         /* Note: only single thread will access one sub_request each time,
 235          * so no need lock here */
 236         list_add(&new->stc_list, &dtrqs->dtrqs_cookie_list);
 237
 238         return 0;
 239 }
 240
 241 /**
 242  * Insert distribute txn sub req replay
 243  *
 244  * Allocate sub replay req and insert distribute txn replay list.
 245  *
 246  * \param[in] dtrq      d to be added
 247  * \param[in] cookie    the cookie of the update record
 248  * \param[in] mdt_index the mdt_index of the update record
 249  *
 250  * \retval              0 if the adding succeeds.
 251  * \retval              negative errno if the adding fails.
 252  */
 253 static int
 254 dtrq_sub_create_and_insert(struct distribute_txn_replay_req *dtrq,
 255                            struct llog_cookie *cookie,
 256                            __u32 mdt_index)
 257 {
 258         struct distribute_txn_replay_req_sub    *dtrqs = NULL;
 259         struct distribute_txn_replay_req_sub    *new;
 260         int                                     rc;
 261         ENTRY;
 262
 263         spin_lock(&dtrq->dtrq_sub_list_lock);
 264         dtrqs = dtrq_sub_lookup(dtrq, mdt_index);
 265         spin_unlock(&dtrq->dtrq_sub_list_lock);
 266         if (dtrqs != NULL) {
 267                 rc = dtrq_sub_add_cookie(dtrqs, cookie);
 268                 RETURN(0);
 269         }
 270
 271         OBD_ALLOC_PTR(new);
 272         if (new == NULL)
 273                 RETURN(-ENOMEM);
 274
 275         INIT_LIST_HEAD(&new->dtrqs_list);
 276         INIT_LIST_HEAD(&new->dtrqs_cookie_list);
 277         new->dtrqs_mdt_index = mdt_index;
 278         spin_lock(&dtrq->dtrq_sub_list_lock);
 279         dtrqs = dtrq_sub_lookup(dtrq, mdt_index);
 280         if (dtrqs == NULL) {
 281                 list_add(&new->dtrqs_list, &dtrq->dtrq_sub_list);
 282                 dtrqs = new;
 283         } else {
 284                 OBD_FREE_PTR(new);
 285         }
 286         spin_unlock(&dtrq->dtrq_sub_list_lock);
 287
 288         rc = dtrq_sub_add_cookie(dtrqs, cookie);
 289
 290         RETURN(rc);
 291 }
 292
 293 /**
 294  * append updates to the current replay updates
 295  *
 296  * Append more updates to the existent replay update. And this is only
 297  * used when combining mulitple updates into one large updates during
 298  * replay.
 299  *
 300  * \param[in] dtrq      the update replay request where the new update
 301  *                      records will be added.
 302  * \param[in] lur       the new update record.
 303  *
 304  * \retval              0 if appending succeeds.
 305  * \retval              negative errno if appending fails.
 306  */
 307 static int dtrq_append_updates(struct distribute_txn_replay_req *dtrq,
 308                                struct update_records *record)
 309 {
 310         struct llog_update_record *new_lur;
 311         size_t lur_size = dtrq->dtrq_lur_size;
 312         void *ptr;
 313         ENTRY;
 314
 315         /* Because several threads might retrieve the same records from
 316          * different targets, and we only need one copy of records. So
 317          * we will check if the records is in the next one, if not, just
 318          * skip it */
 319         spin_lock(&dtrq->dtrq_sub_list_lock);
 320         if (dtrq->dtrq_lur->lur_update_rec.ur_index + 1 != record->ur_index) {
 321                 spin_unlock(&dtrq->dtrq_sub_list_lock);
 322                 RETURN(0);
 323         }
 324         dtrq->dtrq_lur->lur_update_rec.ur_index++;
 325         spin_unlock(&dtrq->dtrq_sub_list_lock);
 326
 327         lur_size += update_records_size(record);
 328         OBD_ALLOC_LARGE(new_lur, lur_size);
 329         if (new_lur == NULL) {
 330                 spin_lock(&dtrq->dtrq_sub_list_lock);
 331                 dtrq->dtrq_lur->lur_update_rec.ur_index--;
 332                 spin_unlock(&dtrq->dtrq_sub_list_lock);
 333                 RETURN(-ENOMEM);
 334         }
 335
 336         /* Copy the old and new records to the new allocated buffer */
 337         memcpy(new_lur, dtrq->dtrq_lur, dtrq->dtrq_lur_size);
 338         ptr = (char *)&new_lur->lur_update_rec +
 339                 update_records_size(&new_lur->lur_update_rec);
 340         memcpy(ptr, &record->ur_ops,
 341                update_records_size(record) -
 342                offsetof(struct update_records, ur_ops));
 343
 344         new_lur->lur_update_rec.ur_update_count += record->ur_update_count;
 345         new_lur->lur_update_rec.ur_param_count += record->ur_param_count;
 346         new_lur->lur_hdr.lrh_len = llog_update_record_size(new_lur);
 347
 348         /* Replace the records */
 349         OBD_FREE_LARGE(dtrq->dtrq_lur, dtrq->dtrq_lur_size);
 350         dtrq->dtrq_lur = new_lur;
 351         dtrq->dtrq_lur_size = lur_size;
 352         dtrq->dtrq_lur->lur_update_rec.ur_flags = record->ur_flags;
 353         update_records_dump(&new_lur->lur_update_rec, D_INFO, true);
 354         RETURN(0);
 355 }
 356
 357 /**
 358  * Insert update records to the replay list.
 359  *
 360  * Allocate distribute txn replay req and insert it into the replay
 361  * list, then insert the update records into the replay req.
 362  *
 363  * \param[in] tdtd      distribute txn replay data where the replay list
 364  *                      is.
 365  * \param[in] record    the update record
 366  * \param[in] cookie    cookie of the record
 367  * \param[in] index     mdt index of the record
 368  *
 369  * \retval              0 if the adding succeeds.
 370  * \retval              negative errno if the adding fails.
 371  */
 372 int
 373 insert_update_records_to_replay_list(struct target_distribute_txn_data *tdtd,
 374                                      struct llog_update_record *lur,
 375                                      struct llog_cookie *cookie,
 376                                      __u32 mdt_index)
 377 {
 378         struct distribute_txn_replay_req *dtrq;
 379         struct update_records *record = &lur->lur_update_rec;
 380         bool replace_record = false;
 381         int rc = 0;
 382         ENTRY;
 383
 384         CDEBUG(D_HA, "%s: insert record batchid = "LPU64" transno = "LPU64
 385                " mdt_index %u\n", tdtd->tdtd_lut->lut_obd->obd_name,
 386                record->ur_batchid, record->ur_master_transno, mdt_index);
 387
 388         /* Update batchid if necessary */
 389         spin_lock(&tdtd->tdtd_batchid_lock);
 390         if (record->ur_batchid >= tdtd->tdtd_batchid) {
 391                 CDEBUG(D_HA, "%s update batchid from "LPU64 " to "LPU64"\n",
 392                        tdtd->tdtd_lut->lut_obd->obd_name,
 393                        tdtd->tdtd_batchid, record->ur_batchid);
 394                 tdtd->tdtd_batchid = record->ur_batchid + 1;
 395         }
 396         spin_unlock(&tdtd->tdtd_batchid_lock);
 397
 398 again:
 399         spin_lock(&tdtd->tdtd_replay_list_lock);
 400         /* First try to build the replay update request with the records */
 401         dtrq = dtrq_lookup(tdtd, record->ur_batchid);
 402         if (dtrq == NULL) {
 403                 spin_unlock(&tdtd->tdtd_replay_list_lock);
 404                 dtrq = dtrq_create(tdtd, lur);
 405                 if (IS_ERR(dtrq))
 406                         RETURN(PTR_ERR(dtrq));
 407
 408                 spin_lock(&tdtd->tdtd_replay_list_lock);
 409                 rc = dtrq_insert(tdtd, dtrq);
 410                 if (rc < 0) {
 411                         spin_unlock(&tdtd->tdtd_replay_list_lock);
 412                         dtrq_destroy(dtrq);
 413                         if (rc == -EEXIST)
 414                                 goto again;
 415                         return rc;
 416                 }
 417         } else {
 418                 /* If the master transno in update header is not
 419                 * matched with the one in the record, then it means
 420                 * the dtrq is originally created by master record,
 421                 * so we need update master transno and reposition
 422                 * the dtrq(by master transno) in the list and also
 423                 * replace update record */
 424                 if (record->ur_master_transno != 0 &&
 425                     dtrq->dtrq_master_transno != record->ur_master_transno &&
 426                     dtrq->dtrq_lur != NULL) {
 427                         list_del_init(&dtrq->dtrq_list);
 428                         dtrq->dtrq_lur->lur_update_rec.ur_master_transno =
 429                                                 record->ur_master_transno;
 430
 431                         dtrq->dtrq_master_transno = record->ur_master_transno;
 432                         replace_record = true;
 433                         /* try to insert again */
 434                         rc = dtrq_insert(tdtd, dtrq);
 435                         if (rc < 0) {
 436                                 spin_unlock(&tdtd->tdtd_replay_list_lock);
 437                                 dtrq_destroy(dtrq);
 438                                 return rc;
 439                         }
 440                 }
 441         }
 442         spin_unlock(&tdtd->tdtd_replay_list_lock);
 443
 444         /* Because there should be only thread access the update record, so
 445          * we do not need lock here */
 446         if (replace_record) {
 447                 /* Replace the update record and master transno */
 448                 OBD_FREE_LARGE(dtrq->dtrq_lur, dtrq->dtrq_lur_size);
 449                 dtrq->dtrq_lur = NULL;
 450                 dtrq->dtrq_lur_size = llog_update_record_size(lur);
 451                 OBD_ALLOC_LARGE(dtrq->dtrq_lur, dtrq->dtrq_lur_size);
 452                 if (dtrq->dtrq_lur == NULL)
 453                         return -ENOMEM;
 454
 455                 memcpy(dtrq->dtrq_lur, lur, dtrq->dtrq_lur_size);
 456         }
 457
 458         /* This is a partial update records, let's try to append
 459          * the record to the current replay request */
 460         if (record->ur_flags & UPDATE_RECORD_CONTINUE)
 461                 rc = dtrq_append_updates(dtrq, record);
 462
 463         /* Then create and add sub update request */
 464         rc = dtrq_sub_create_and_insert(dtrq, cookie, mdt_index);
 465
 466         RETURN(rc);
 467 }
 468 EXPORT_SYMBOL(insert_update_records_to_replay_list);
 469
 470 /**
 471  * Dump updates of distribute txns.
 472  *
 473  * Output all of recovery updates in the distribute txn list to the
 474  * debug log.
 475  *
 476  * \param[in] tdtd      distribute txn data where all of distribute txn
 477  *                      are listed.
 478  * \param[in] mask      debug mask
 479  */
 480 void dtrq_list_dump(struct target_distribute_txn_data *tdtd, unsigned int mask)
 481 {
 482         struct distribute_txn_replay_req *dtrq;
 483
 484         spin_lock(&tdtd->tdtd_replay_list_lock);
 485         list_for_each_entry(dtrq, &tdtd->tdtd_replay_list, dtrq_list)
 486                 update_records_dump(&dtrq->dtrq_lur->lur_update_rec, mask,
 487                                     false);
 488         spin_unlock(&tdtd->tdtd_replay_list_lock);
 489 }
 490 EXPORT_SYMBOL(dtrq_list_dump);
 491
 492 /**
 493  * Destroy distribute txn replay req
 494  *
 495  * Destroy distribute txn replay req and all of subs.
 496  *
 497  * \param[in] dtrq      distribute txn replqy req to be destroyed.
 498  */
 499 void dtrq_destroy(struct distribute_txn_replay_req *dtrq)
 500 {
 501         struct distribute_txn_replay_req_sub    *dtrqs;
 502         struct distribute_txn_replay_req_sub    *tmp;
 503
 504         LASSERT(list_empty(&dtrq->dtrq_list));
 505         spin_lock(&dtrq->dtrq_sub_list_lock);
 506         list_for_each_entry_safe(dtrqs, tmp, &dtrq->dtrq_sub_list, dtrqs_list) {
 507                 struct sub_thandle_cookie *stc;
 508                 struct sub_thandle_cookie *tmp;
 509
 510                 list_del(&dtrqs->dtrqs_list);
 511                 list_for_each_entry_safe(stc, tmp, &dtrqs->dtrqs_cookie_list,
 512                                          stc_list) {
 513                         list_del(&stc->stc_list);
 514                         OBD_FREE_PTR(stc);
 515                 }
 516                 OBD_FREE_PTR(dtrqs);
 517         }
 518         spin_unlock(&dtrq->dtrq_sub_list_lock);
 519
 520         if (dtrq->dtrq_lur != NULL)
 521                 OBD_FREE_LARGE(dtrq->dtrq_lur, dtrq->dtrq_lur_size);
 522
 523         OBD_FREE_PTR(dtrq);
 524 }
 525 EXPORT_SYMBOL(dtrq_destroy);
 526
 527 /**
 528  * Destroy all of replay req.
 529  *
 530  * Destroy all of replay req in the replay list.
 531  *
 532  * \param[in] tdtd      target distribute txn data where the replay list is.
 533  */
 534 void dtrq_list_destroy(struct target_distribute_txn_data *tdtd)
 535 {
 536         struct distribute_txn_replay_req *dtrq;
 537         struct distribute_txn_replay_req *tmp;
 538
 539         spin_lock(&tdtd->tdtd_replay_list_lock);
 540         list_for_each_entry_safe(dtrq, tmp, &tdtd->tdtd_replay_list,
 541                                  dtrq_list) {
 542                 list_del_init(&dtrq->dtrq_list);
 543                 dtrq_destroy(dtrq);
 544         }
 545         list_for_each_entry_safe(dtrq, tmp, &tdtd->tdtd_replay_finish_list,
 546                                  dtrq_list) {
 547                 list_del_init(&dtrq->dtrq_list);
 548                 dtrq_destroy(dtrq);
 549         }
 550         spin_unlock(&tdtd->tdtd_replay_list_lock);
 551 }
 552 EXPORT_SYMBOL(dtrq_list_destroy);
 553
 554 /**
 555  * Get next req in the replay list
 556  *
 557  * Get next req needs to be replayed, since it is a sorted list
 558  * (by master MDT transno)
 559  *
 560  * \param[in] tdtd      distribute txn data where the replay list is
 561  *
 562  * \retval              the pointer of update recovery header
 563  */
 564 struct distribute_txn_replay_req *
 565 distribute_txn_get_next_req(struct target_distribute_txn_data *tdtd)
 566 {
 567         struct distribute_txn_replay_req *dtrq = NULL;
 568
 569         spin_lock(&tdtd->tdtd_replay_list_lock);
 570         if (!list_empty(&tdtd->tdtd_replay_list)) {
 571                 dtrq = list_entry(tdtd->tdtd_replay_list.next,
 572                                  struct distribute_txn_replay_req, dtrq_list);
 573                 list_del_init(&dtrq->dtrq_list);
 574         }
 575         spin_unlock(&tdtd->tdtd_replay_list_lock);
 576
 577         return dtrq;
 578 }
 579 EXPORT_SYMBOL(distribute_txn_get_next_req);
 580
 581 /**
 582  * Get next transno in the replay list, because this is the sorted
 583  * list, so it will return the transno of next req in the list.
 584  *
 585  * \param[in] tdtd      distribute txn data where the replay list is
 586  *
 587  * \retval              the transno of next update in the list
 588  */
 589 __u64 distribute_txn_get_next_transno(struct target_distribute_txn_data *tdtd)
 590 {
 591         struct distribute_txn_replay_req        *dtrq = NULL;
 592         __u64                                   transno = 0;
 593
 594         spin_lock(&tdtd->tdtd_replay_list_lock);
 595         if (!list_empty(&tdtd->tdtd_replay_list)) {
 596                 dtrq = list_entry(tdtd->tdtd_replay_list.next,
 597                                  struct distribute_txn_replay_req, dtrq_list);
 598                 transno = dtrq->dtrq_master_transno;
 599         }
 600         spin_unlock(&tdtd->tdtd_replay_list_lock);
 601
 602         CDEBUG(D_HA, "%s: Next update transno "LPU64"\n",
 603                tdtd->tdtd_lut->lut_obd->obd_name, transno);
 604         return transno;
 605 }
 606 EXPORT_SYMBOL(distribute_txn_get_next_transno);
 607
 608 struct distribute_txn_replay_req *
 609 distribute_txn_lookup_finish_list(struct target_distribute_txn_data *tdtd,
 610                                   __u64 xid)
 611 {
 612         struct distribute_txn_replay_req *dtrq = NULL;
 613         struct distribute_txn_replay_req *iter;
 614
 615         spin_lock(&tdtd->tdtd_replay_list_lock);
 616         list_for_each_entry(iter, &tdtd->tdtd_replay_finish_list, dtrq_list) {
 617                 if (iter->dtrq_xid == xid) {
 618                         dtrq = iter;
 619                         break;
 620                 }
 621         }
 622         spin_unlock(&tdtd->tdtd_replay_list_lock);
 623         return dtrq;
 624 }
 625
 626 bool is_req_replayed_by_update(struct ptlrpc_request *req)
 627 {
 628         struct lu_target *tgt = class_exp2tgt(req->rq_export);
 629         struct distribute_txn_replay_req *dtrq;
 630
 631         if (tgt->lut_tdtd == NULL)
 632                 return false;
 633
 634         dtrq = distribute_txn_lookup_finish_list(tgt->lut_tdtd, req->rq_xid);
 635         if (dtrq == NULL)
 636                 return false;
 637
 638         return true;
 639 }
 640 EXPORT_SYMBOL(is_req_replayed_by_update);
 641
 642 /**
 643  * Check if the update of one object is committed
 644  *
 645  * Check whether the update for the object is committed by checking whether
 646  * the correspondent sub exists in the replay req. If it is committed, mark
 647  * the committed flag in correspondent the sub thandle.
 648  *
 649  * \param[in] env       execution environment
 650  * \param[in] dtrq      replay request
 651  * \param[in] dt_obj    object for the update
 652  * \param[in] top_th    top thandle
 653  * \param[in] sub_th    sub thandle which the update belongs to
 654  *
 655  * \retval              1 if the update is not committed.
 656  * \retval              0 if the update is committed.
 657  * \retval              negative errno if some other failures happen.
 658  */
 659 static int update_is_committed(const struct lu_env *env,
 660                                struct distribute_txn_replay_req *dtrq,
 661                                struct dt_object *dt_obj,
 662                                struct top_thandle *top_th,
 663                                struct sub_thandle *st)
 664 {
 665         struct seq_server_site  *seq_site;
 666         const struct lu_fid     *fid = lu_object_fid(&dt_obj->do_lu);
 667         struct distribute_txn_replay_req_sub    *dtrqs;
 668         __u32                   mdt_index;
 669         ENTRY;
 670
 671         if (st->st_sub_th != NULL)
 672                 RETURN(1);
 673
 674         if (st->st_committed)
 675                 RETURN(0);
 676
 677         seq_site = lu_site2seq(dt_obj->do_lu.lo_dev->ld_site);
 678         if (fid_is_update_log(fid) || fid_is_update_log_dir(fid)) {
 679                 mdt_index = fid_oid(fid);
 680         } else if (!fid_seq_in_fldb(fid_seq(fid))) {
 681                 mdt_index = seq_site->ss_node_id;
 682         } else {
 683                 struct lu_server_fld *fld;
 684                 struct lu_seq_range range = {0};
 685                 int rc;
 686
 687                 fld = seq_site->ss_server_fld;
 688                 fld_range_set_type(&range, LU_SEQ_RANGE_MDT);
 689                 LASSERT(fld->lsf_seq_lookup != NULL);
 690                 rc = fld->lsf_seq_lookup(env, fld, fid_seq(fid),
 691                                          &range);
 692                 if (rc < 0)
 693                         RETURN(rc);
 694                 mdt_index = range.lsr_index;
 695         }
 696
 697         dtrqs = dtrq_sub_lookup(dtrq, mdt_index);
 698         if (dtrqs != NULL || top_th->tt_multiple_thandle->tmt_committed) {
 699                 st->st_committed = 1;
 700                 if (dtrqs != NULL) {
 701                         struct sub_thandle_cookie *stc;
 702                         struct sub_thandle_cookie *tmp;
 703
 704                         list_for_each_entry_safe(stc, tmp,
 705                                                  &dtrqs->dtrqs_cookie_list,
 706                                                  stc_list)
 707                                 list_move(&stc->stc_list, &st->st_cookie_list);
 708                 }
 709                 RETURN(0);
 710         }
 711
 712         CDEBUG(D_HA, "Update of "DFID "on MDT%u is not committed\n", PFID(fid),
 713                mdt_index);
 714
 715         RETURN(1);
 716 }
 717
 718 /**
 719  * Implementation of different update methods for update recovery.
 720  *
 721  * These following functions update_recovery_$(update_name) implement
 722  * different updates recovery methods. They will extract the parameters
 723  * from the common parameters area and call correspondent dt API to redo
 724  * the update.
 725  *
 726  * \param[in] env       execution environment
 727  * \param[in] op        update operation to be replayed
 728  * \param[in] params    common update parameters which holds all parameters
 729  *                      of the operation
 730  * \param[in] th        transaction handle
 731  * \param[in] declare   indicate it will do declare or real execution, true
 732  *                      means declare, false means real execution
 733  *
 734  * \retval              0 if it succeeds.
 735  * \retval              negative errno if it fails.
 736  */
 737 static int update_recovery_create(const struct lu_env *env,
 738                                   struct dt_object *dt_obj,
 739                                   const struct update_op *op,
 740                                   const struct update_params *params,
 741                                   struct thandle_exec_args *ta,
 742                                   struct thandle *th)
 743 {
 744         struct update_thread_info *uti = update_env_info(env);
 745         struct llog_update_record *lur = uti->uti_dtrq->dtrq_lur;
 746         struct lu_attr          *attr = &uti->uti_attr;
 747         struct obdo             *wobdo;
 748         struct obdo             *lobdo = &uti->uti_obdo;
 749         struct dt_object_format dof;
 750         __u16                   size;
 751         unsigned int            param_count;
 752         int rc;
 753         ENTRY;
 754
 755         if (dt_object_exists(dt_obj))
 756                 RETURN(-EEXIST);
 757
 758         param_count = lur->lur_update_rec.ur_param_count;
 759         wobdo = update_params_get_param_buf(params, op->uop_params_off[0],
 760                                             param_count, &size);
 761         if (wobdo == NULL)
 762                 RETURN(-EIO);
 763         if (size != sizeof(*wobdo))
 764                 RETURN(-EIO);
 765
 766         if (LLOG_REC_HDR_NEEDS_SWABBING(&lur->lur_hdr))
 767                 lustre_swab_obdo(wobdo);
 768
 769         lustre_get_wire_obdo(NULL, lobdo, wobdo);
 770         la_from_obdo(attr, lobdo, lobdo->o_valid);
 771
 772         dof.dof_type = dt_mode_to_dft(attr->la_mode);
 773
 774         rc = out_tx_create(env, dt_obj, attr, NULL, &dof,
 775                            ta, th, NULL, 0);
 776
 777         RETURN(rc);
 778 }
 779
 780 static int update_recovery_destroy(const struct lu_env *env,
 781                                    struct dt_object *dt_obj,
 782                                    const struct update_op *op,
 783                                    const struct update_params *params,
 784                                    struct thandle_exec_args *ta,
 785                                    struct thandle *th)
 786 {
 787         int rc;
 788         ENTRY;
 789
 790         rc = out_tx_destroy(env, dt_obj, ta, th, NULL, 0);
 791
 792         RETURN(rc);
 793 }
 794
 795 static int update_recovery_ref_add(const struct lu_env *env,
 796                                    struct dt_object *dt_obj,
 797                                    const struct update_op *op,
 798                                    const struct update_params *params,
 799                                    struct thandle_exec_args *ta,
 800                                    struct thandle *th)
 801 {
 802         int rc;
 803         ENTRY;
 804
 805         rc = out_tx_ref_add(env, dt_obj, ta, th, NULL, 0);
 806
 807         RETURN(rc);
 808 }
 809
 810 static int update_recovery_ref_del(const struct lu_env *env,
 811                                    struct dt_object *dt_obj,
 812                                    const struct update_op *op,
 813                                    const struct update_params *params,
 814                                    struct thandle_exec_args *ta,
 815                                    struct thandle *th)
 816 {
 817         int rc;
 818         ENTRY;
 819
 820         rc = out_tx_ref_del(env, dt_obj, ta, th, NULL, 0);
 821
 822         RETURN(rc);
 823 }
 824
 825 static int update_recovery_attr_set(const struct lu_env *env,
 826                                     struct dt_object *dt_obj,
 827                                     const struct update_op *op,
 828                                     const struct update_params *params,
 829                                     struct thandle_exec_args *ta,
 830                                     struct thandle *th)
 831 {
 832         struct update_thread_info *uti = update_env_info(env);
 833         struct llog_update_record *lur = uti->uti_dtrq->dtrq_lur;
 834         struct obdo     *wobdo;
 835         struct obdo     *lobdo = &uti->uti_obdo;
 836         struct lu_attr  *attr = &uti->uti_attr;
 837         __u16           size;
 838         unsigned int    param_count;
 839         int             rc;
 840         ENTRY;
 841
 842         param_count = lur->lur_update_rec.ur_param_count;
 843         wobdo = update_params_get_param_buf(params, op->uop_params_off[0],
 844                                             param_count, &size);
 845         if (wobdo == NULL)
 846                 RETURN(-EIO);
 847         if (size != sizeof(*wobdo))
 848                 RETURN(-EIO);
 849
 850         if (LLOG_REC_HDR_NEEDS_SWABBING(&lur->lur_hdr))
 851                 lustre_swab_obdo(wobdo);
 852
 853         lustre_get_wire_obdo(NULL, lobdo, wobdo);
 854         la_from_obdo(attr, lobdo, lobdo->o_valid);
 855
 856         rc = out_tx_attr_set(env, dt_obj, attr, ta, th, NULL, 0);
 857
 858         RETURN(rc);
 859 }
 860
 861 static int update_recovery_xattr_set(const struct lu_env *env,
 862                                      struct dt_object *dt_obj,
 863                                      const struct update_op *op,
 864                                      const struct update_params *params,
 865                                      struct thandle_exec_args *ta,
 866                                      struct thandle *th)
 867 {
 868         struct update_thread_info *uti = update_env_info(env);
 869         char            *buf;
 870         char            *name;
 871         int             fl;
 872         __u16           size;
 873         __u32           param_count;
 874         int             rc;
 875         ENTRY;
 876
 877         param_count = uti->uti_dtrq->dtrq_lur->lur_update_rec.ur_param_count;
 878         name = update_params_get_param_buf(params,
 879                                            op->uop_params_off[0],
 880                                            param_count, &size);
 881         if (name == NULL)
 882                 RETURN(-EIO);
 883
 884         buf = update_params_get_param_buf(params,
 885                                           op->uop_params_off[1],
 886                                           param_count, &size);
 887         if (buf == NULL)
 888                 RETURN(-EIO);
 889
 890         uti->uti_buf.lb_buf = buf;
 891         uti->uti_buf.lb_len = (size_t)size;
 892
 893         buf = update_params_get_param_buf(params, op->uop_params_off[2],
 894                                           param_count, &size);
 895         if (buf == NULL)
 896                 RETURN(-EIO);
 897         if (size != sizeof(fl))
 898                 RETURN(-EIO);
 899
 900         fl = le32_to_cpu(*(int *)buf);
 901
 902         rc = out_tx_xattr_set(env, dt_obj, &uti->uti_buf, name, fl, ta, th,
 903                               NULL, 0);
 904
 905         RETURN(rc);
 906 }
 907
 908 static int update_recovery_index_insert(const struct lu_env *env,
 909                                         struct dt_object *dt_obj,
 910                                         const struct update_op *op,
 911                                         const struct update_params *params,
 912                                         struct thandle_exec_args *ta,
 913                                         struct thandle *th)
 914 {
 915         struct update_thread_info *uti = update_env_info(env);
 916         struct lu_fid           *fid;
 917         char                    *name;
 918         __u32                   param_count;
 919         __u32                   *ptype;
 920         __u32                   type;
 921         __u16                   size;
 922         int rc;
 923         ENTRY;
 924
 925         param_count = uti->uti_dtrq->dtrq_lur->lur_update_rec.ur_param_count;
 926         name = update_params_get_param_buf(params, op->uop_params_off[0],
 927                                            param_count, &size);
 928         if (name == NULL)
 929                 RETURN(-EIO);
 930
 931         fid = update_params_get_param_buf(params, op->uop_params_off[1],
 932                                           param_count, &size);
 933         if (fid == NULL)
 934                 RETURN(-EIO);
 935         if (size != sizeof(*fid))
 936                 RETURN(-EIO);
 937
 938         fid_le_to_cpu(fid, fid);
 939
 940         ptype = update_params_get_param_buf(params, op->uop_params_off[2],
 941                                             param_count, &size);
 942         if (ptype == NULL)
 943                 RETURN(-EIO);
 944         if (size != sizeof(*ptype))
 945                 RETURN(-EIO);
 946         type = le32_to_cpu(*ptype);
 947
 948         if (dt_try_as_dir(env, dt_obj) == 0)
 949                 RETURN(-ENOTDIR);
 950
 951         uti->uti_rec.rec_fid = fid;
 952         uti->uti_rec.rec_type = type;
 953
 954         rc = out_tx_index_insert(env, dt_obj,
 955                                  (const struct dt_rec *)&uti->uti_rec,
 956                                  (const struct dt_key *)name, ta, th,
 957                                  NULL, 0);
 958
 959         RETURN(rc);
 960 }
 961
 962 static int update_recovery_index_delete(const struct lu_env *env,
 963                                         struct dt_object *dt_obj,
 964                                         const struct update_op *op,
 965                                         const struct update_params *params,
 966                                         struct thandle_exec_args *ta,
 967                                         struct thandle *th)
 968 {
 969         struct update_thread_info *uti = update_env_info(env);
 970         __u32   param_count;
 971         char    *name;
 972         __u16   size;
 973         int     rc;
 974         ENTRY;
 975
 976         param_count = uti->uti_dtrq->dtrq_lur->lur_update_rec.ur_param_count;
 977         name = update_params_get_param_buf(params, op->uop_params_off[0],
 978                                            param_count, &size);
 979         if (name == NULL)
 980                 RETURN(-EIO);
 981
 982         if (dt_try_as_dir(env, dt_obj) == 0)
 983                 RETURN(-ENOTDIR);
 984
 985         rc = out_tx_index_delete(env, dt_obj,
 986                                  (const struct dt_key *)name, ta, th, NULL, 0);
 987
 988         RETURN(rc);
 989 }
 990
 991 static int update_recovery_write(const struct lu_env *env,
 992                                  struct dt_object *dt_obj,
 993                                  const struct update_op *op,
 994                                  const struct update_params *params,
 995                                  struct thandle_exec_args *ta,
 996                                  struct thandle *th)
 997 {
 998         struct update_thread_info *uti = update_env_info(env);
 999         char            *buf;
1000         __u32           param_count;
1001         __u64           pos;
1002         __u16           size;
1003         int rc;
1004         ENTRY;
1005
1006         param_count = uti->uti_dtrq->dtrq_lur->lur_update_rec.ur_param_count;
1007         buf = update_params_get_param_buf(params, op->uop_params_off[0],
1008                                           param_count, &size);
1009         if (buf == NULL)
1010                 RETURN(-EIO);
1011
1012         uti->uti_buf.lb_buf = buf;
1013         uti->uti_buf.lb_len = size;
1014
1015         buf = update_params_get_param_buf(params, op->uop_params_off[1],
1016                                           param_count, &size);
1017         if (buf == NULL)
1018                 RETURN(-EIO);
1019
1020         pos = le64_to_cpu(*(__u64 *)buf);
1021
1022         rc = out_tx_write(env, dt_obj, &uti->uti_buf, pos,
1023                           ta, th, NULL, 0);
1024
1025         RETURN(rc);
1026 }
1027
1028 static int update_recovery_xattr_del(const struct lu_env *env,
1029                                      struct dt_object *dt_obj,
1030                                      const struct update_op *op,
1031                                      const struct update_params *params,
1032                                      struct thandle_exec_args *ta,
1033                                      struct thandle *th)
1034 {
1035         struct update_thread_info *uti = update_env_info(env);
1036         __u32   param_count;
1037         char    *name;
1038         __u16   size;
1039         int     rc;
1040         ENTRY;
1041
1042         param_count = uti->uti_dtrq->dtrq_lur->lur_update_rec.ur_param_count;
1043         name = update_params_get_param_buf(params, op->uop_params_off[0],
1044                                            param_count, &size);
1045         if (name == NULL)
1046                 RETURN(-EIO);
1047
1048         rc = out_tx_xattr_del(env, dt_obj, name, ta, th, NULL, 0);
1049
1050         RETURN(rc);
1051 }
1052
1053 /**
1054  * Update session information
1055  *
1056  * Update session information so tgt_txn_stop_cb()->tgt_last_rcvd_update()
1057  * can be called correctly during update replay.
1058  *
1059  * \param[in] env       execution environment.
1060  * \param[in] tdtd      distribute data structure of the recovering tgt.
1061  * \param[in] th        thandle of this update replay.
1062  * \param[in] master_th master sub thandle.
1063  * \param[in] ta_arg    the tx arg structure to hold the update for updating
1064  *                      reply data.
1065  */
1066 static void update_recovery_update_ses(struct lu_env *env,
1067                                       struct target_distribute_txn_data *tdtd,
1068                                       struct thandle *th,
1069                                       struct thandle *master_th,
1070                                       struct distribute_txn_replay_req *dtrq,
1071                                       struct tx_arg *ta_arg)
1072 {
1073         struct tgt_session_info *tsi;
1074         struct lu_target        *lut = tdtd->tdtd_lut;
1075         struct obd_export       *export;
1076         struct cfs_hash         *hash;
1077         struct top_thandle      *top_th;
1078         struct lsd_reply_data   *lrd;
1079         size_t                  size;
1080
1081         tsi = tgt_ses_info(env);
1082         if (tsi->tsi_exp != NULL)
1083                 return;
1084
1085         size = ta_arg->u.write.buf.lb_len;
1086         lrd = ta_arg->u.write.buf.lb_buf;
1087         if (size != sizeof(*lrd) || lrd == NULL)
1088                 return;
1089
1090         lrd->lrd_transno         = le64_to_cpu(lrd->lrd_transno);
1091         lrd->lrd_xid             = le64_to_cpu(lrd->lrd_xid);
1092         lrd->lrd_data            = le64_to_cpu(lrd->lrd_data);
1093         lrd->lrd_result          = le32_to_cpu(lrd->lrd_result);
1094         lrd->lrd_client_gen      = le32_to_cpu(lrd->lrd_client_gen);
1095
1096         if (lrd->lrd_transno != tgt_th_info(env)->tti_transno)
1097                 return;
1098
1099         hash = cfs_hash_getref(lut->lut_obd->obd_gen_hash);
1100         if (hash == NULL)
1101                 return;
1102
1103         export = cfs_hash_lookup(hash, &lrd->lrd_client_gen);
1104         if (export == NULL) {
1105                 cfs_hash_putref(hash);
1106                 return;
1107         }
1108
1109         tsi->tsi_exp = export;
1110         tsi->tsi_xid = lrd->lrd_xid;
1111         tsi->tsi_opdata = lrd->lrd_data;
1112         tsi->tsi_result = lrd->lrd_result;
1113         tsi->tsi_client_gen = lrd->lrd_client_gen;
1114         dtrq->dtrq_xid = lrd->lrd_xid;
1115         top_th = container_of(th, struct top_thandle, tt_super);
1116         top_th->tt_master_sub_thandle = master_th;
1117         cfs_hash_putref(hash);
1118 }
1119
1120 /**
1121  * Execute updates in the update replay records
1122  *
1123  * Declare distribute txn replay by update records and add the updates
1124  * to the execution list. Note: it will check if the update has been
1125  * committed, and only execute the updates if it is not committed to
1126  * disk.
1127  *
1128  * \param[in] env       execution environment
1129  * \param[in] tdtd      distribute txn replay data which hold all of replay
1130  *                      reqs and all replay parameters.
1131  * \param[in] dtrq      distribute transaction replay req.
1132  * \param[in] ta        thandle execute args.
1133  *
1134  * \retval              0 if declare succeeds.
1135  * \retval              negative errno if declare fails.
1136  */
1137 static int update_recovery_exec(const struct lu_env *env,
1138                                 struct target_distribute_txn_data *tdtd,
1139                                 struct distribute_txn_replay_req *dtrq,
1140                                 struct thandle_exec_args *ta)
1141 {
1142         struct llog_update_record *lur = dtrq->dtrq_lur;
1143         struct update_records   *records = &lur->lur_update_rec;
1144         struct update_ops       *ops = &records->ur_ops;
1145         struct update_params    *params = update_records_get_params(records);
1146         struct top_thandle      *top_th = container_of(ta->ta_handle,
1147                                                        struct top_thandle,
1148                                                        tt_super);
1149         struct top_multiple_thandle *tmt = top_th->tt_multiple_thandle;
1150         struct update_op        *op;
1151         unsigned int            i;
1152         int                     rc = 0;
1153         ENTRY;
1154
1155         /* These records have been swabbed in llog_cat_process() */
1156         for (i = 0, op = &ops->uops_op[0]; i < records->ur_update_count;
1157              i++, op = update_op_next_op(op)) {
1158                 struct lu_fid           *fid = &op->uop_fid;
1159                 struct dt_object        *dt_obj;
1160                 struct dt_object        *sub_dt_obj;
1161                 struct dt_device        *sub_dt;
1162                 struct sub_thandle      *st;
1163
1164                 if (op->uop_type == OUT_NOOP)
1165                         continue;
1166
1167                 dt_obj = dt_locate(env, tdtd->tdtd_dt, fid);
1168                 if (IS_ERR(dt_obj)) {
1169                         rc = PTR_ERR(dt_obj);
1170                         break;
1171                 }
1172                 sub_dt_obj = dt_object_child(dt_obj);
1173
1174                 /* Create sub thandle if not */
1175                 sub_dt = lu2dt_dev(sub_dt_obj->do_lu.lo_dev);
1176                 st = lookup_sub_thandle(tmt, sub_dt);
1177                 if (st == NULL) {
1178                         st = create_sub_thandle(tmt, sub_dt);
1179                         if (IS_ERR(st))
1180                                 GOTO(next, rc = PTR_ERR(st));
1181                 }
1182
1183                 /* check if updates on the OSD/OSP are committed */
1184                 rc = update_is_committed(env, dtrq, dt_obj, top_th, st);
1185                 if (rc == 0)
1186                         /* If this is committed, goto next */
1187                         goto next;
1188
1189                 if (rc < 0)
1190                         GOTO(next, rc);
1191
1192                 /* Create thandle for sub thandle if needed */
1193                 if (st->st_sub_th == NULL) {
1194                         rc = sub_thandle_trans_create(env, top_th, st);
1195                         if (rc != 0)
1196                                 GOTO(next, rc);
1197                 }
1198
1199                 CDEBUG(D_HA, "replay %uth update\n", i);
1200                 switch (op->uop_type) {
1201                 case OUT_CREATE:
1202                         rc = update_recovery_create(env, sub_dt_obj,
1203                                                     op, params, ta,
1204                                                     st->st_sub_th);
1205                         break;
1206                 case OUT_DESTROY:
1207                         rc = update_recovery_destroy(env, sub_dt_obj,
1208                                                      op, params, ta,
1209                                                      st->st_sub_th);
1210                         break;
1211                 case OUT_REF_ADD:
1212                         rc = update_recovery_ref_add(env, sub_dt_obj,
1213                                                      op, params, ta,
1214                                                      st->st_sub_th);
1215                         break;
1216                 case OUT_REF_DEL:
1217                         rc = update_recovery_ref_del(env, sub_dt_obj,
1218                                                      op, params, ta,
1219                                                      st->st_sub_th);
1220                         break;
1221                 case OUT_ATTR_SET:
1222                         rc = update_recovery_attr_set(env, sub_dt_obj,
1223                                                       op, params, ta,
1224                                                       st->st_sub_th);
1225                         break;
1226                 case OUT_XATTR_SET:
1227                         rc = update_recovery_xattr_set(env, sub_dt_obj,
1228                                                        op, params, ta,
1229                                                        st->st_sub_th);
1230                         break;
1231                 case OUT_INDEX_INSERT:
1232                         rc = update_recovery_index_insert(env, sub_dt_obj,
1233                                                           op, params, ta,
1234                                                           st->st_sub_th);
1235                         break;
1236                 case OUT_INDEX_DELETE:
1237                         rc = update_recovery_index_delete(env, sub_dt_obj,
1238                                                           op, params, ta,
1239                                                           st->st_sub_th);
1240                         break;
1241                 case OUT_WRITE:
1242                         rc = update_recovery_write(env, sub_dt_obj,
1243                                                    op, params, ta,
1244                                                    st->st_sub_th);
1245                         break;
1246                 case OUT_XATTR_DEL:
1247                         rc = update_recovery_xattr_del(env, sub_dt_obj,
1248                                                        op, params, ta,
1249                                                        st->st_sub_th);
1250                         break;
1251                 default:
1252                         CERROR("Unknown update type %u\n", (__u32)op->uop_type);
1253                         rc = -EINVAL;
1254                         break;
1255                 }
1256 next:
1257                 lu_object_put(env, &dt_obj->do_lu);
1258                 if (rc < 0)
1259                         break;
1260         }
1261
1262         ta->ta_handle->th_result = rc;
1263         RETURN(rc);
1264 }
1265
1266 /**
1267  * redo updates on MDT if needed.
1268  *
1269  * During DNE recovery, the recovery thread (target_recovery_thread) will call
1270  * this function to replay distribute txn updates on all MDTs. It only replay
1271  * updates on the MDT where the update record is missing.
1272  *
1273  * If the update already exists on the MDT, then it does not need replay the
1274  * updates on that MDT, and only mark the sub transaction has been committed
1275  * there.
1276  *
1277  * \param[in] env       execution environment
1278  * \param[in] tdtd      target distribute txn data, which holds the replay list
1279  *                      and all parameters needed by replay process.
1280  * \param[in] dtrq      distribute txn replay req.
1281  *
1282  * \retval              0 if replay succeeds.
1283  * \retval              negative errno if replay failes.
1284  */
1285 int distribute_txn_replay_handle(struct lu_env *env,
1286                                  struct target_distribute_txn_data *tdtd,
1287                                  struct distribute_txn_replay_req *dtrq)
1288 {
1289         struct update_records   *records = &dtrq->dtrq_lur->lur_update_rec;
1290         struct thandle_exec_args *ta;
1291         struct lu_context       session_env;
1292         struct thandle          *th = NULL;
1293         struct top_thandle      *top_th;
1294         struct top_multiple_thandle *tmt;
1295         struct thandle_update_records *tur = NULL;
1296         int                     i;
1297         int                     rc = 0;
1298         ENTRY;
1299
1300         /* initialize session, it is needed for the handler of target */
1301         rc = lu_context_init(&session_env, LCT_SERVER_SESSION | LCT_NOREF);
1302         if (rc) {
1303                 CERROR("%s: failure to initialize session: rc = %d\n",
1304                        tdtd->tdtd_lut->lut_obd->obd_name, rc);
1305                 RETURN(rc);
1306         }
1307         lu_context_enter(&session_env);
1308         env->le_ses = &session_env;
1309         lu_env_refill(env);
1310         update_records_dump(records, D_HA, true);
1311         th = top_trans_create(env, NULL);
1312         if (IS_ERR(th))
1313                 GOTO(exit_session, rc = PTR_ERR(th));
1314
1315         ta = &update_env_info(env)->uti_tea;
1316         ta->ta_argno = 0;
1317
1318         update_env_info(env)->uti_dtrq = dtrq;
1319         /* Create distribute transaction structure for this top thandle */
1320         top_th = container_of(th, struct top_thandle, tt_super);
1321         rc = top_trans_create_tmt(env, top_th);
1322         if (rc < 0)
1323                 GOTO(stop_trans, rc);
1324
1325         th->th_dev = tdtd->tdtd_dt;
1326         ta->ta_handle = th;
1327
1328         /* check if the distribute transaction has been committed */
1329         tmt = top_th->tt_multiple_thandle;
1330         tmt->tmt_master_sub_dt = tdtd->tdtd_lut->lut_bottom;
1331         tmt->tmt_batchid = dtrq->dtrq_batchid;
1332         tgt_th_info(env)->tti_transno = dtrq->dtrq_master_transno;
1333
1334         if (tmt->tmt_batchid <= tdtd->tdtd_committed_batchid)
1335                 tmt->tmt_committed = 1;
1336
1337         rc = update_recovery_exec(env, tdtd, dtrq, ta);
1338         if (rc < 0)
1339                 GOTO(stop_trans, rc);
1340
1341         /* If no updates are needed to be replayed, then mark this records as
1342          * committed, so commit thread distribute_txn_commit_thread() will
1343          * delete the record */
1344         if (ta->ta_argno == 0)
1345                 tmt->tmt_committed = 1;
1346
1347         tur = &update_env_info(env)->uti_tur;
1348         tur->tur_update_records = dtrq->dtrq_lur;
1349         tur->tur_update_records_buf_size = dtrq->dtrq_lur_size;
1350         tur->tur_update_params = NULL;
1351         tur->tur_update_param_count = 0;
1352         tmt->tmt_update_records = tur;
1353
1354         distribute_txn_insert_by_batchid(tmt);
1355         rc = top_trans_start(env, NULL, th);
1356         if (rc < 0)
1357                 GOTO(stop_trans, rc);
1358
1359         for (i = 0; i < ta->ta_argno; i++) {
1360                 struct tx_arg           *ta_arg;
1361                 struct dt_object        *dt_obj;
1362                 struct dt_device        *sub_dt;
1363                 struct sub_thandle      *st;
1364
1365                 ta_arg = ta->ta_args[i];
1366                 dt_obj = ta_arg->object;
1367
1368                 LASSERT(tmt->tmt_committed == 0);
1369                 sub_dt = lu2dt_dev(dt_obj->do_lu.lo_dev);
1370                 st = lookup_sub_thandle(tmt, sub_dt);
1371
1372                 LASSERT(st != NULL);
1373                 LASSERT(st->st_sub_th != NULL);
1374                 rc = ta->ta_args[i]->exec_fn(env, st->st_sub_th,
1375                                              ta->ta_args[i]);
1376
1377                 /* If the update is to update the reply data, then
1378                  * we need set the session information, so
1379                  * tgt_last_rcvd_update() can be called correctly */
1380                 if (rc == 0 && dt_obj == tdtd->tdtd_lut->lut_reply_data)
1381                         update_recovery_update_ses(env, tdtd, th,
1382                                                    st->st_sub_th, dtrq, ta_arg);
1383
1384                 if (unlikely(rc < 0)) {
1385                         CDEBUG(D_HA, "error during execution of #%u from"
1386                                " %s:%d: rc = %d\n", i, ta->ta_args[i]->file,
1387                                ta->ta_args[i]->line, rc);
1388                         while (--i > 0) {
1389                                 if (ta->ta_args[i]->undo_fn != NULL) {
1390                                         dt_obj = ta->ta_args[i]->object;
1391                                         sub_dt =
1392                                                 lu2dt_dev(dt_obj->do_lu.lo_dev);
1393                                         st = lookup_sub_thandle(tmt, sub_dt);
1394                                         LASSERT(st != NULL);
1395                                         LASSERT(st->st_sub_th != NULL);
1396
1397                                         ta->ta_args[i]->undo_fn(env,
1398                                                                st->st_sub_th,
1399                                                                ta->ta_args[i]);
1400                                 } else {
1401                                         CERROR("%s: undo for %s:%d: rc = %d\n",
1402                                              dt_obd_name(ta->ta_handle->th_dev),
1403                                                ta->ta_args[i]->file,
1404                                                ta->ta_args[i]->line, -ENOTSUPP);
1405                                 }
1406                         }
1407                         break;
1408                 }
1409                 CDEBUG(D_HA, "%s: executed %u/%u: rc = %d\n",
1410                        dt_obd_name(sub_dt), i, ta->ta_argno, rc);
1411         }
1412
1413 stop_trans:
1414         if (rc < 0)
1415                 th->th_result = rc;
1416         rc = top_trans_stop(env, tdtd->tdtd_dt, th);
1417         for (i = 0; i < ta->ta_argno; i++) {
1418                 if (ta->ta_args[i]->object != NULL) {
1419                         lu_object_put(env, &ta->ta_args[i]->object->do_lu);
1420                         ta->ta_args[i]->object = NULL;
1421                 }
1422         }
1423
1424         if (tur != NULL)
1425                 tur->tur_update_records = NULL;
1426
1427         if (tgt_ses_info(env)->tsi_exp != NULL) {
1428                 class_export_put(tgt_ses_info(env)->tsi_exp);
1429                 tgt_ses_info(env)->tsi_exp = NULL;
1430         }
1431 exit_session:
1432         lu_context_exit(&session_env);
1433         lu_context_fini(&session_env);
1434         RETURN(rc);
1435 }
1436 EXPORT_SYMBOL(distribute_txn_replay_handle);