lustre/target/update_trans.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, Intel Corporation.
  24  */
  25 /*
  26  * lustre/target/update_trans.c
  27  *
  28  * This file implements the update distribute transaction API.
  29  *
  30  * To manage the cross-MDT operation (distribute operation) transaction,
  31  * the transaction will also be separated two layers on MD stack, top
  32  * transaction and sub transaction.
  33  *
  34  * During the distribute operation, top transaction is created in the LOD
  35  * layer, and represent the operation. Sub transaction is created by
  36  * each OSD or OSP. Top transaction start/stop will trigger all of its sub
  37  * transaction start/stop. Top transaction (the whole operation) is committed
  38  * only all of its sub transaction are committed.
  39  *
  40  * there are three kinds of transactions
  41  * 1. local transaction: All updates are in a single local OSD.
  42  * 2. Remote transaction: All Updates are only in the remote OSD,
  43  *    i.e. locally all updates are in OSP.
  44  * 3. Mixed transaction: Updates are both in local OSD and remote
  45  *    OSD.
  46  *
  47  * Author: Di Wang <di.wang@intel.com>
  48  */
  49
  50 #define DEBUG_SUBSYSTEM S_CLASS
  51
  52 #include <linux/kthread.h>
  53 #include <lu_target.h>
  54 #include <lustre_log.h>
  55 #include <lustre_update.h>
  56 #include <obd.h>
  57 #include <obd_class.h>
  58 #include <tgt_internal.h>
  59
  60 #include <tgt_internal.h>
  61 /**
  62  * Dump top mulitple thandle
  63  *
  64  * Dump top multiple thandle and all of its sub thandle to the debug log.
  65  *
  66  * \param[in]mask       debug mask
  67  * \param[in]top_th     top_thandle to be dumped
  68  */
  69 static void top_multiple_thandle_dump(struct top_multiple_thandle *tmt,
  70                                       __u32 mask)
  71 {
  72         struct sub_thandle      *st;
  73
  74         LASSERT(tmt->tmt_magic == TOP_THANDLE_MAGIC);
  75         CDEBUG(mask, "%s tmt %p refcount %d committed %d result %d"
  76                "batchid "LPU64"\n",
  77                tmt->tmt_master_sub_dt ?
  78                tmt->tmt_master_sub_dt->dd_lu_dev.ld_obd->obd_name :
  79                "NULL",
  80                tmt, atomic_read(&tmt->tmt_refcount), tmt->tmt_committed,
  81                tmt->tmt_result, tmt->tmt_batchid);
  82
  83         list_for_each_entry(st, &tmt->tmt_sub_thandle_list, st_sub_list) {
  84                 struct sub_thandle_cookie *stc;
  85
  86                 CDEBUG(mask, "st %p obd %s committed %d sub_th %p\n",
  87                        st, st->st_dt->dd_lu_dev.ld_obd->obd_name,
  88                        st->st_committed, st->st_sub_th);
  89
  90                 list_for_each_entry(stc, &st->st_cookie_list, stc_list) {
  91                         CDEBUG(mask, " cookie "DOSTID": %u\n",
  92                                POSTID(&stc->stc_cookie.lgc_lgl.lgl_oi),
  93                                stc->stc_cookie.lgc_index);
  94                 }
  95         }
  96 }
  97
  98 /**
  99  * Declare write update to sub device
 100  *
 101  * Declare Write updates llog records to the sub device during distribute
 102  * transaction.
 103  *
 104  * \param[in] env       execution environment
 105  * \param[in] record    update records being written
 106  * \param[in] sub_th    sub transaction handle
 107  * \param[in] record_size total update record size
 108  *
 109  * \retval              0 if writing succeeds
 110  * \retval              negative errno if writing fails
 111  */
 112 static int sub_declare_updates_write(const struct lu_env *env,
 113                                      struct llog_update_record *record,
 114                                      struct thandle *sub_th, size_t record_size)
 115 {
 116         struct llog_ctxt        *ctxt;
 117         struct dt_device        *dt = sub_th->th_dev;
 118         int                     left = record_size;
 119         int rc;
 120
 121         /* If ctxt is NULL, it means not need to write update,
 122          * for example if the the OSP is used to connect to OST */
 123         ctxt = llog_get_context(dt->dd_lu_dev.ld_obd,
 124                                 LLOG_UPDATELOG_ORIG_CTXT);
 125
 126         /* Not ready to record updates yet. */
 127         if (ctxt == NULL || ctxt->loc_handle == NULL) {
 128                 llog_ctxt_put(ctxt);
 129                 return 0;
 130         }
 131
 132         rc = llog_declare_add(env, ctxt->loc_handle,
 133                               &record->lur_hdr, sub_th);
 134         if (rc < 0)
 135                 GOTO(out_put, rc);
 136
 137         while (left > ctxt->loc_chunk_size) {
 138                 rc = llog_declare_add(env, ctxt->loc_handle,
 139                                       &record->lur_hdr, sub_th);
 140                 if (rc < 0)
 141                         GOTO(out_put, rc);
 142
 143                 left -= ctxt->loc_chunk_size;
 144         }
 145
 146 out_put:
 147         llog_ctxt_put(ctxt);
 148
 149         return rc;
 150 }
 151
 152 /**
 153  * write update to sub device
 154  *
 155  * Write llog update record to the sub device during distribute
 156  * transaction. If it succeeds, llog cookie of the record will be
 157  * returned by @cookie.
 158  *
 159  * \param[in] env       execution environment
 160  * \param[in] record    update records being written
 161  * \param[in] sub_th    sub transaction handle
 162  * \param[out] cookie   llog cookie of the update record.
 163  *
 164  * \retval              1 if writing succeeds
 165  * \retval              negative errno if writing fails
 166  */
 167 static int sub_updates_write(const struct lu_env *env,
 168                              struct llog_update_record *record,
 169                              struct sub_thandle *sub_th)
 170 {
 171         struct dt_device        *dt = sub_th->st_dt;
 172         struct llog_ctxt        *ctxt;
 173         int                     rc;
 174         struct llog_update_record *lur = NULL;
 175         struct update_params    *params = NULL;
 176         __u32                   update_count = 0;
 177         __u32                   param_count = 0;
 178         __u32                   last_update_count = 0;
 179         __u32                   last_param_count = 0;
 180         void                    *src;
 181         void                    *start;
 182         void                    *next;
 183         struct sub_thandle_cookie *stc;
 184         ENTRY;
 185
 186         ctxt = llog_get_context(dt->dd_lu_dev.ld_obd,
 187                                 LLOG_UPDATELOG_ORIG_CTXT);
 188         /* If ctxt == NULL, then it means updates on OST (only happens
 189          * during migration), and we do not track those updates for now */
 190         /* If ctxt->loc_handle == NULL, then it does not need to record
 191          * update, usually happens in error handler path */
 192         if (ctxt == NULL || ctxt->loc_handle == NULL) {
 193                 llog_ctxt_put(ctxt);
 194                 RETURN(0);
 195         }
 196
 197         /* Since the cross-MDT updates will includes both local
 198          * and remote updates, the update ops count must > 1 */
 199         LASSERT(record->lur_update_rec.ur_update_count > 1);
 200         LASSERTF(record->lur_hdr.lrh_len == llog_update_record_size(record),
 201                  "lrh_len %u record_size %zu\n", record->lur_hdr.lrh_len,
 202                  llog_update_record_size(record));
 203
 204         if (likely(record->lur_hdr.lrh_len <= ctxt->loc_chunk_size)) {
 205                 OBD_ALLOC_PTR(stc);
 206                 if (stc == NULL)
 207                         GOTO(llog_put, rc = -ENOMEM);
 208                 INIT_LIST_HEAD(&stc->stc_list);
 209
 210                 rc = llog_add(env, ctxt->loc_handle, &record->lur_hdr,
 211                               &stc->stc_cookie, sub_th->st_sub_th);
 212
 213                 CDEBUG(D_INFO, "%s: Add update log "DOSTID":%u: rc = %d\n",
 214                        dt->dd_lu_dev.ld_obd->obd_name,
 215                        POSTID(&stc->stc_cookie.lgc_lgl.lgl_oi),
 216                        stc->stc_cookie.lgc_index, rc);
 217
 218                 if (rc > 0) {
 219                         list_add(&stc->stc_list, &sub_th->st_cookie_list);
 220                         rc = 0;
 221                 } else {
 222                         OBD_FREE_PTR(stc);
 223                 }
 224
 225                 GOTO(llog_put, rc);
 226         }
 227
 228         /* Split the records into chunk_size update record */
 229         OBD_ALLOC_LARGE(lur, ctxt->loc_chunk_size);
 230         if (lur == NULL)
 231                 GOTO(llog_put, rc = -ENOMEM);
 232
 233         memcpy(lur, &record->lur_hdr, sizeof(record->lur_hdr));
 234         lur->lur_update_rec.ur_update_count = 0;
 235         lur->lur_update_rec.ur_param_count = 0;
 236         src = &record->lur_update_rec.ur_ops;
 237         start = next = src;
 238         lur->lur_hdr.lrh_len = llog_update_record_size(lur);
 239         params = update_records_get_params(&record->lur_update_rec);
 240         do {
 241                 size_t rec_len;
 242
 243                 if (update_count < record->lur_update_rec.ur_update_count) {
 244                         next = update_op_next_op((struct update_op *)src);
 245                 } else {
 246                         if (param_count == 0)
 247                                 next = update_records_get_params(
 248                                                 &record->lur_update_rec);
 249                         else
 250                                 next = (char *)src +
 251                                         object_update_param_size(
 252                                         (struct object_update_param *)src);
 253                 }
 254
 255                 rec_len = cfs_size_round((unsigned long)(next - src));
 256                 /* If its size > llog chunk_size, then write current chunk to
 257                  * the update llog. */
 258                 if (lur->lur_hdr.lrh_len + rec_len + LLOG_MIN_REC_SIZE >
 259                     ctxt->loc_chunk_size ||
 260                     param_count == record->lur_update_rec.ur_param_count) {
 261                         lur->lur_update_rec.ur_update_count =
 262                                 update_count > last_update_count ?
 263                                 update_count - last_update_count : 0;
 264                         lur->lur_update_rec.ur_param_count = param_count -
 265                                                              last_param_count;
 266
 267                         memcpy(&lur->lur_update_rec.ur_ops, start,
 268                                (unsigned long)(src - start));
 269                         if (last_update_count != 0)
 270                                 lur->lur_update_rec.ur_flags |=
 271                                                 UPDATE_RECORD_CONTINUE;
 272
 273                         update_records_dump(&lur->lur_update_rec, D_INFO, true);
 274                         lur->lur_hdr.lrh_len = llog_update_record_size(lur);
 275                         LASSERT(lur->lur_hdr.lrh_len <= ctxt->loc_chunk_size);
 276
 277                         OBD_ALLOC_PTR(stc);
 278                         if (stc == NULL)
 279                                 GOTO(llog_put, rc = -ENOMEM);
 280                         INIT_LIST_HEAD(&stc->stc_list);
 281
 282                         rc = llog_add(env, ctxt->loc_handle,
 283                                       &lur->lur_hdr,
 284                                       &stc->stc_cookie, sub_th->st_sub_th);
 285
 286                         CDEBUG(D_INFO, "%s: Add update log "DOSTID":%u"
 287                                " rc = %d\n", dt->dd_lu_dev.ld_obd->obd_name,
 288                                POSTID(&stc->stc_cookie.lgc_lgl.lgl_oi),
 289                                stc->stc_cookie.lgc_index, rc);
 290
 291                         if (rc > 0) {
 292                                 list_add(&stc->stc_list,
 293                                          &sub_th->st_cookie_list);
 294                                 rc = 0;
 295                         } else {
 296                                 OBD_FREE_PTR(stc);
 297                                 GOTO(llog_put, rc);
 298                         }
 299
 300                         last_update_count = update_count;
 301                         last_param_count = param_count;
 302                         start = src;
 303                         lur->lur_update_rec.ur_update_count = 0;
 304                         lur->lur_update_rec.ur_param_count = 0;
 305                         lur->lur_hdr.lrh_len = llog_update_record_size(lur);
 306                 }
 307
 308                 src = next;
 309                 lur->lur_hdr.lrh_len += cfs_size_round(rec_len);
 310                 if (update_count < record->lur_update_rec.ur_update_count)
 311                         update_count++;
 312                 else if (param_count < record->lur_update_rec.ur_param_count)
 313                         param_count++;
 314                 else
 315                         break;
 316         } while (1);
 317
 318 llog_put:
 319         if (lur != NULL)
 320                 OBD_FREE_LARGE(lur, ctxt->loc_chunk_size);
 321         llog_ctxt_put(ctxt);
 322
 323         RETURN(rc);
 324 }
 325
 326 /**
 327  * Prepare the update records.
 328  *
 329  * Merge params and ops into the update records, then initializing
 330  * the update buffer.
 331  *
 332  * During transaction execution phase, parameters and update ops
 333  * are collected in two different buffers (see lod_updates_pack()),
 334  * during transaction stop, it needs to be merged in one buffer,
 335  * so it will be written in the update log.
 336  *
 337  * \param[in] env       execution environment
 338  * \param[in] tmt       top_multiple_thandle for distribute txn
 339  *
 340  * \retval              0 if merging succeeds.
 341  * \retval              negaitive errno if merging fails.
 342  */
 343 static int prepare_writing_updates(const struct lu_env *env,
 344                                    struct top_multiple_thandle *tmt)
 345 {
 346         struct thandle_update_records   *tur = tmt->tmt_update_records;
 347         struct llog_update_record       *lur;
 348         struct update_params *params;
 349         size_t params_size;
 350         size_t update_size;
 351
 352         if (tur == NULL || tur->tur_update_records == NULL ||
 353             tur->tur_update_params == NULL)
 354                 return 0;
 355
 356         lur = tur->tur_update_records;
 357         /* Extends the update records buffer if needed */
 358         params_size = update_params_size(tur->tur_update_params,
 359                                          tur->tur_update_param_count);
 360         LASSERT(lur->lur_update_rec.ur_param_count == 0);
 361         update_size = llog_update_record_size(lur);
 362         if (cfs_size_round(update_size + params_size) >
 363             tur->tur_update_records_buf_size) {
 364                 int rc;
 365
 366                 rc = tur_update_records_extend(tur,
 367                         cfs_size_round(update_size + params_size));
 368                 if (rc < 0)
 369                         return rc;
 370
 371                 lur = tur->tur_update_records;
 372         }
 373
 374         params = update_records_get_params(&lur->lur_update_rec);
 375         memcpy(params, tur->tur_update_params, params_size);
 376
 377         lur->lur_update_rec.ur_param_count = tur->tur_update_param_count;
 378         lur->lur_update_rec.ur_batchid = tmt->tmt_batchid;
 379         /* Init update record header */
 380         lur->lur_hdr.lrh_len = llog_update_record_size(lur);
 381         lur->lur_hdr.lrh_type = UPDATE_REC;
 382
 383         /* Dump updates for debugging purpose */
 384         update_records_dump(&lur->lur_update_rec, D_INFO, true);
 385
 386         return 0;
 387 }
 388
 389 static inline int
 390 distribute_txn_commit_thread_running(struct lu_target *lut)
 391 {
 392         return lut->lut_tdtd_commit_thread.t_flags & SVC_RUNNING;
 393 }
 394
 395 static inline int
 396 distribute_txn_commit_thread_stopped(struct lu_target *lut)
 397 {
 398         return lut->lut_tdtd_commit_thread.t_flags & SVC_STOPPED;
 399 }
 400
 401 /**
 402  * Top thandle commit callback
 403  *
 404  * This callback will be called when all of sub transactions are committed.
 405  *
 406  * \param[in] th        top thandle to be committed.
 407  */
 408 static void top_trans_committed_cb(struct top_multiple_thandle *tmt)
 409 {
 410         struct lu_target *lut;
 411         ENTRY;
 412
 413         LASSERT(atomic_read(&tmt->tmt_refcount) > 0);
 414
 415         top_multiple_thandle_dump(tmt, D_HA);
 416         tmt->tmt_committed = 1;
 417         lut = dt2lu_dev(tmt->tmt_master_sub_dt)->ld_site->ls_tgt;
 418         if (distribute_txn_commit_thread_running(lut))
 419                 wake_up(&lut->lut_tdtd->tdtd_commit_thread_waitq);
 420         RETURN_EXIT;
 421 }
 422
 423 struct sub_thandle *lookup_sub_thandle(struct top_multiple_thandle *tmt,
 424                                        struct dt_device *dt_dev)
 425 {
 426         struct sub_thandle *st;
 427
 428         list_for_each_entry(st, &tmt->tmt_sub_thandle_list, st_sub_list) {
 429                 if (st->st_dt == dt_dev)
 430                         return st;
 431         }
 432         return NULL;
 433 }
 434 EXPORT_SYMBOL(lookup_sub_thandle);
 435
 436 struct sub_thandle *create_sub_thandle(struct top_multiple_thandle *tmt,
 437                                        struct dt_device *dt_dev)
 438 {
 439         struct sub_thandle *st;
 440
 441         OBD_ALLOC_PTR(st);
 442         if (st == NULL)
 443                 RETURN(ERR_PTR(-ENOMEM));
 444
 445         INIT_LIST_HEAD(&st->st_sub_list);
 446         INIT_LIST_HEAD(&st->st_cookie_list);
 447         st->st_dt = dt_dev;
 448
 449         list_add(&st->st_sub_list, &tmt->tmt_sub_thandle_list);
 450         return st;
 451 }
 452
 453 /**
 454  * sub thandle commit callback
 455  *
 456  * Mark the sub thandle to be committed and if all sub thandle are committed
 457  * notify the top thandle.
 458  *
 459  * \param[in] env       execution environment
 460  * \param[in] sub_th    sub thandle being committed
 461  * \param[in] cb        commit callback
 462  * \param[in] err       trans result
 463  */
 464 static void sub_trans_commit_cb(struct lu_env *env,
 465                                 struct thandle *sub_th,
 466                                 struct dt_txn_commit_cb *cb, int err)
 467 {
 468         struct sub_thandle      *st;
 469         struct top_multiple_thandle *tmt = cb->dcb_data;
 470         bool                    all_committed = true;
 471         ENTRY;
 472
 473         /* Check if all sub thandles are committed */
 474         spin_lock(&tmt->tmt_sub_lock);
 475         list_for_each_entry(st, &tmt->tmt_sub_thandle_list, st_sub_list) {
 476                 if (st->st_sub_th == sub_th) {
 477                         st->st_committed = 1;
 478                         st->st_result = err;
 479                 }
 480                 if (!st->st_committed)
 481                         all_committed = false;
 482         }
 483         spin_unlock(&tmt->tmt_sub_lock);
 484
 485         if (tmt->tmt_result == 0)
 486                 tmt->tmt_result = err;
 487
 488         if (all_committed)
 489                 top_trans_committed_cb(tmt);
 490
 491         top_multiple_thandle_dump(tmt, D_INFO);
 492         top_multiple_thandle_put(tmt);
 493         RETURN_EXIT;
 494 }
 495
 496 static void sub_thandle_register_commit_cb(struct sub_thandle *st,
 497                                     struct top_multiple_thandle *tmt)
 498 {
 499         LASSERT(st->st_sub_th != NULL);
 500         top_multiple_thandle_get(tmt);
 501         st->st_commit_dcb.dcb_func = sub_trans_commit_cb;
 502         st->st_commit_dcb.dcb_data = tmt;
 503         INIT_LIST_HEAD(&st->st_commit_dcb.dcb_linkage);
 504         dt_trans_cb_add(st->st_sub_th, &st->st_commit_dcb);
 505 }
 506
 507 /**
 508  * Sub thandle stop call back
 509  *
 510  * After sub thandle is stopped, it will call this callback to notify
 511  * the top thandle.
 512  *
 513  * \param[in] th        sub thandle to be stopped
 514  * \param[in] rc        result of sub trans
 515  */
 516 static void sub_trans_stop_cb(struct lu_env *env,
 517                               struct thandle *sub_th,
 518                               struct dt_txn_commit_cb *cb, int err)
 519 {
 520         struct sub_thandle              *st;
 521         struct top_multiple_thandle     *tmt = cb->dcb_data;
 522         ENTRY;
 523
 524         list_for_each_entry(st, &tmt->tmt_sub_thandle_list, st_sub_list) {
 525                 if (st->st_stopped)
 526                         continue;
 527
 528                 if (st->st_dt == sub_th->th_dev) {
 529                         st->st_stopped = 1;
 530                         st->st_result = err;
 531                         break;
 532                 }
 533         }
 534
 535         wake_up(&tmt->tmt_stop_waitq);
 536         RETURN_EXIT;
 537 }
 538
 539 static void sub_thandle_register_stop_cb(struct sub_thandle *st,
 540                                          struct top_multiple_thandle *tmt)
 541 {
 542         st->st_stop_dcb.dcb_func = sub_trans_stop_cb;
 543         st->st_stop_dcb.dcb_data = tmt;
 544         st->st_stop_dcb.dcb_flags = DCB_TRANS_STOP;
 545         INIT_LIST_HEAD(&st->st_stop_dcb.dcb_linkage);
 546         dt_trans_cb_add(st->st_sub_th, &st->st_stop_dcb);
 547 }
 548
 549 /**
 550  * Create sub thandle
 551  *
 552  * Create transaction handle for sub_thandle
 553  *
 554  * \param[in] env       execution environment
 555  * \param[in] th        top thandle
 556  * \param[in] st        sub_thandle
 557  *
 558  * \retval              0 if creation succeeds.
 559  * \retval              negative errno if creation fails.
 560  */
 561 int sub_thandle_trans_create(const struct lu_env *env,
 562                              struct top_thandle *top_th,
 563                              struct sub_thandle *st)
 564 {
 565         struct thandle *sub_th;
 566
 567         sub_th = dt_trans_create(env, st->st_dt);
 568         if (IS_ERR(sub_th))
 569                 return PTR_ERR(sub_th);
 570
 571         sub_th->th_top = &top_th->tt_super;
 572         st->st_sub_th = sub_th;
 573
 574         sub_th->th_wait_submit = 1;
 575         return 0;
 576 }
 577
 578 /**
 579  * Create the top transaction.
 580  *
 581  * Create the top transaction on the master device. It will create a top
 582  * thandle and a sub thandle on the master device.
 583  *
 584  * \param[in] env               execution environment
 585  * \param[in] master_dev        master_dev the top thandle will be created
 586  *
 587  * \retval                      pointer to the created thandle.
 588  * \retval                      ERR_PTR(errno) if creation failed.
 589  */
 590 struct thandle *
 591 top_trans_create(const struct lu_env *env, struct dt_device *master_dev)
 592 {
 593         struct top_thandle      *top_th;
 594         struct thandle          *child_th;
 595
 596         OBD_ALLOC_GFP(top_th, sizeof(*top_th), __GFP_IO);
 597         if (top_th == NULL)
 598                 return ERR_PTR(-ENOMEM);
 599
 600         top_th->tt_super.th_top = &top_th->tt_super;
 601
 602         if (master_dev != NULL) {
 603                 child_th = dt_trans_create(env, master_dev);
 604                 if (IS_ERR(child_th)) {
 605                         OBD_FREE_PTR(top_th);
 606                         return child_th;
 607                 }
 608
 609                 child_th->th_top = &top_th->tt_super;
 610                 child_th->th_wait_submit = 1;
 611                 top_th->tt_master_sub_thandle = child_th;
 612
 613                 top_th->tt_super.th_tags |= child_th->th_tags;
 614         }
 615         return &top_th->tt_super;
 616 }
 617 EXPORT_SYMBOL(top_trans_create);
 618
 619 /**
 620  * Declare write update transaction
 621  *
 622  * Check if there are updates being recorded in this transaction,
 623  * it will write the record into the disk.
 624  *
 625  * \param[in] env       execution environment
 626  * \param[in] tmt       top multiple transaction handle
 627  *
 628  * \retval              0 if writing succeeds
 629  * \retval              negative errno if writing fails
 630  */
 631 static int declare_updates_write(const struct lu_env *env,
 632                                  struct top_multiple_thandle *tmt)
 633 {
 634         struct llog_update_record *record;
 635         struct sub_thandle *st;
 636         int rc = 0;
 637
 638         record = tmt->tmt_update_records->tur_update_records;
 639         /* Declare update write for all other target */
 640         list_for_each_entry(st, &tmt->tmt_sub_thandle_list, st_sub_list) {
 641                 if (st->st_sub_th == NULL)
 642                         continue;
 643
 644                 rc = sub_declare_updates_write(env, record, st->st_sub_th,
 645                                                tmt->tmt_record_size);
 646                 if (rc < 0)
 647                         break;
 648         }
 649
 650         return rc;
 651 }
 652
 653 /**
 654  * Assign batchid to the distribute transaction.
 655  *
 656  * Assign batchid to the distribute transaction
 657  *
 658  * \param[in] tmt       distribute transaction
 659  */
 660 static void distribute_txn_assign_batchid(struct top_multiple_thandle *new)
 661 {
 662         struct target_distribute_txn_data *tdtd;
 663         struct dt_device *dt = new->tmt_master_sub_dt;
 664
 665         LASSERT(dt != NULL);
 666         tdtd = dt2lu_dev(dt)->ld_site->ls_tgt->lut_tdtd;
 667         spin_lock(&tdtd->tdtd_batchid_lock);
 668         new->tmt_batchid = tdtd->tdtd_batchid++;
 669         list_add_tail(&new->tmt_commit_list, &tdtd->tdtd_list);
 670         spin_unlock(&tdtd->tdtd_batchid_lock);
 671         top_multiple_thandle_get(new);
 672         top_multiple_thandle_dump(new, D_INFO);
 673 }
 674
 675 /**
 676  * Insert distribute transaction to the distribute txn list.
 677  *
 678  * Insert distribute transaction to the distribute txn list.
 679  *
 680  * \param[in] new       the distribute txn to be inserted.
 681  */
 682 void distribute_txn_insert_by_batchid(struct top_multiple_thandle *new)
 683 {
 684         struct dt_device *dt = new->tmt_master_sub_dt;
 685         struct top_multiple_thandle *tmt;
 686         struct target_distribute_txn_data *tdtd;
 687         bool    at_head = false;
 688
 689         LASSERT(dt != NULL);
 690         tdtd = dt2lu_dev(dt)->ld_site->ls_tgt->lut_tdtd;
 691
 692         spin_lock(&tdtd->tdtd_batchid_lock);
 693         list_for_each_entry_reverse(tmt, &tdtd->tdtd_list, tmt_commit_list) {
 694                 if (new->tmt_batchid > tmt->tmt_batchid) {
 695                         list_add(&new->tmt_commit_list, &tmt->tmt_commit_list);
 696                         break;
 697                 }
 698         }
 699         if (list_empty(&new->tmt_commit_list)) {
 700                 at_head = true;
 701                 list_add(&new->tmt_commit_list, &tdtd->tdtd_list);
 702         }
 703         spin_unlock(&tdtd->tdtd_batchid_lock);
 704         top_multiple_thandle_get(new);
 705         top_multiple_thandle_dump(new, D_INFO);
 706         if (new->tmt_committed && at_head)
 707                 wake_up(&tdtd->tdtd_commit_thread_waitq);
 708 }
 709
 710 /**
 711  * Prepare cross-MDT operation.
 712  *
 713  * Create the update record buffer to record updates for cross-MDT operation,
 714  * add master sub transaction to tt_sub_trans_list, and declare the update
 715  * writes.
 716  *
 717  * During updates packing, all of parameters will be packed in
 718  * tur_update_params, and updates will be packed in tur_update_records.
 719  * Then in transaction stop, parameters and updates will be merged
 720  * into one updates buffer.
 721  *
 722  * And also master thandle will be added to the sub_th list, so it will be
 723  * easy to track the commit status.
 724  *
 725  * \param[in] env       execution environment
 726  * \param[in] th        top transaction handle
 727  *
 728  * \retval              0 if preparation succeeds.
 729  * \retval              negative errno if preparation fails.
 730  */
 731 static int prepare_multiple_node_trans(const struct lu_env *env,
 732                                        struct top_multiple_thandle *tmt)
 733 {
 734         struct thandle_update_records   *tur;
 735         int                             rc;
 736         ENTRY;
 737
 738         if (tmt->tmt_update_records == NULL) {
 739                 tur = &update_env_info(env)->uti_tur;
 740                 rc = check_and_prepare_update_record(env, tur);
 741                 if (rc < 0)
 742                         RETURN(rc);
 743
 744                 tmt->tmt_update_records = tur;
 745                 distribute_txn_assign_batchid(tmt);
 746         }
 747
 748         rc = declare_updates_write(env, tmt);
 749
 750         RETURN(rc);
 751 }
 752
 753 /**
 754  * start the top transaction.
 755  *
 756  * Start all of its sub transactions, then start master sub transaction.
 757  *
 758  * \param[in] env               execution environment
 759  * \param[in] master_dev        master_dev the top thandle will be start
 760  * \param[in] th                top thandle
 761  *
 762  * \retval                      0 if transaction start succeeds.
 763  * \retval                      negative errno if start fails.
 764  */
 765 int top_trans_start(const struct lu_env *env, struct dt_device *master_dev,
 766                     struct thandle *th)
 767 {
 768         struct top_thandle      *top_th = container_of(th, struct top_thandle,
 769                                                        tt_super);
 770         struct sub_thandle              *st;
 771         struct top_multiple_thandle     *tmt = top_th->tt_multiple_thandle;
 772         int                             rc = 0;
 773         ENTRY;
 774
 775         if (tmt == NULL) {
 776                 rc = dt_trans_start(env, top_th->tt_master_sub_thandle->th_dev,
 777                                     top_th->tt_master_sub_thandle);
 778                 RETURN(rc);
 779         }
 780
 781         tmt = top_th->tt_multiple_thandle;
 782         rc = prepare_multiple_node_trans(env, tmt);
 783         if (rc < 0)
 784                 RETURN(rc);
 785
 786         list_for_each_entry(st, &tmt->tmt_sub_thandle_list, st_sub_list) {
 787                 if (st->st_sub_th == NULL)
 788                         continue;
 789                 if (th->th_sync)
 790                         st->st_sub_th->th_sync = th->th_sync;
 791                 st->st_sub_th->th_local = th->th_local;
 792                 st->st_sub_th->th_tags = th->th_tags;
 793                 rc = dt_trans_start(env, st->st_sub_th->th_dev,
 794                                     st->st_sub_th);
 795                 if (rc != 0)
 796                         GOTO(out, rc);
 797
 798                 sub_thandle_register_stop_cb(st, tmt);
 799                 sub_thandle_register_commit_cb(st, tmt);
 800         }
 801 out:
 802         th->th_result = rc;
 803         RETURN(rc);
 804 }
 805 EXPORT_SYMBOL(top_trans_start);
 806
 807 /**
 808  * Check whether we need write updates record
 809  *
 810  * Check if the updates for the top_thandle needs to be writen
 811  * to all targets. Only if the transaction succeeds and the updates
 812  * number > 2, it will write the updates,
 813  *
 814  * \params [in] top_th  top thandle.
 815  *
 816  * \retval              true if it needs to write updates
 817  * \retval              false if it does not need to write updates
 818  **/
 819 static bool top_check_write_updates(struct top_thandle *top_th)
 820 {
 821         struct top_multiple_thandle     *tmt;
 822         struct thandle_update_records   *tur;
 823
 824         /* Do not write updates to records if the transaction fails */
 825         if (top_th->tt_super.th_result != 0)
 826                 return false;
 827
 828         tmt = top_th->tt_multiple_thandle;
 829         if (tmt == NULL)
 830                 return false;
 831
 832         tur = tmt->tmt_update_records;
 833         if (tur == NULL)
 834                 return false;
 835
 836         /* Hmm, false update records, since the cross-MDT operation
 837          * should includes both local and remote updates, so the
 838          * updates count should >= 2 */
 839         if (tur->tur_update_records == NULL ||
 840             tur->tur_update_records->lur_update_rec.ur_update_count <= 1)
 841                 return false;
 842
 843         return true;
 844 }
 845
 846 /**
 847  * Check if top transaction is stopped
 848  *
 849  * Check if top transaction is stopped, only if all sub transaction
 850  * is stopped, then the top transaction is stopped.
 851  *
 852  * \param [in] top_th   top thandle
 853  *
 854  * \retval              true if the top transaction is stopped.
 855  * \retval              false if the top transaction is not stopped.
 856  */
 857 static bool top_trans_is_stopped(struct top_thandle *top_th)
 858 {
 859         struct top_multiple_thandle     *tmt;
 860         struct sub_thandle              *st;
 861         bool                    all_stopped = true;
 862
 863         tmt = top_th->tt_multiple_thandle;
 864         list_for_each_entry(st, &tmt->tmt_sub_thandle_list, st_sub_list) {
 865                 if (!st->st_stopped && st->st_sub_th != NULL) {
 866                         all_stopped = false;
 867                         break;
 868                 }
 869
 870                 if (st->st_result != 0 &&
 871                     top_th->tt_super.th_result == 0)
 872                         top_th->tt_super.th_result = st->st_result;
 873         }
 874
 875         return all_stopped;
 876 }
 877
 878 /**
 879  * Wait result of top transaction
 880  *
 881  * Wait until all sub transaction get its result.
 882  *
 883  * \param [in] top_th   top thandle.
 884  *
 885  * \retval              the result of top thandle.
 886  */
 887 static int top_trans_wait_result(struct top_thandle *top_th)
 888 {
 889         struct l_wait_info      lwi = {0};
 890
 891         l_wait_event(top_th->tt_multiple_thandle->tmt_stop_waitq,
 892                      top_trans_is_stopped(top_th), &lwi);
 893
 894         RETURN(top_th->tt_super.th_result);
 895 }
 896
 897 /**
 898  * Stop the top transaction.
 899  *
 900  * Stop the transaction on the master device first, then stop transactions
 901  * on other sub devices.
 902  *
 903  * \param[in] env               execution environment
 904  * \param[in] master_dev        master_dev the top thandle will be created
 905  * \param[in] th                top thandle
 906  *
 907  * \retval                      0 if stop transaction succeeds.
 908  * \retval                      negative errno if stop transaction fails.
 909  */
 910 int top_trans_stop(const struct lu_env *env, struct dt_device *master_dev,
 911                    struct thandle *th)
 912 {
 913         struct top_thandle      *top_th = container_of(th, struct top_thandle,
 914                                                        tt_super);
 915         struct sub_thandle              *st;
 916         struct sub_thandle              *master_st;
 917         struct top_multiple_thandle     *tmt;
 918         struct thandle_update_records   *tur;
 919         bool                            write_updates = false;
 920         int                     rc = 0;
 921         ENTRY;
 922
 923         if (likely(top_th->tt_multiple_thandle == NULL)) {
 924                 LASSERT(master_dev != NULL);
 925                 rc = dt_trans_stop(env, master_dev,
 926                                    top_th->tt_master_sub_thandle);
 927                 OBD_FREE_PTR(top_th);
 928                 RETURN(rc);
 929         }
 930
 931         tmt = top_th->tt_multiple_thandle;
 932         tur = tmt->tmt_update_records;
 933
 934         /* Note: we need stop the master thandle first, then the stop
 935          * callback will fill the master transno in the update logs,
 936          * then these update logs will be sent to other MDTs */
 937         /* get the master sub thandle */
 938         master_st = lookup_sub_thandle(tmt, tmt->tmt_master_sub_dt);
 939         write_updates = top_check_write_updates(top_th);
 940
 941         /* Step 1: write the updates log on Master MDT */
 942         if (master_st != NULL && master_st->st_sub_th != NULL &&
 943             write_updates) {
 944                 struct llog_update_record *lur;
 945
 946                 /* Merge the parameters and updates into one buffer */
 947                 rc = prepare_writing_updates(env, tmt);
 948                 if (rc < 0) {
 949                         CERROR("%s: cannot prepare updates: rc = %d\n",
 950                                master_dev->dd_lu_dev.ld_obd->obd_name, rc);
 951                         th->th_result = rc;
 952                         GOTO(stop_master_trans, rc);
 953                 }
 954
 955                 lur = tur->tur_update_records;
 956                 /* Write updates to the master MDT */
 957                 rc = sub_updates_write(env, lur, master_st);
 958
 959                 /* Cleanup the common parameters in the update records,
 960                  * master transno callback might add more parameters.
 961                  * and we need merge the update records again in the
 962                  * following */
 963                 if (tur->tur_update_params != NULL)
 964                         lur->lur_update_rec.ur_param_count = 0;
 965
 966                 if (rc < 0) {
 967                         CERROR("%s: write updates failed: rc = %d\n",
 968                                master_dev->dd_lu_dev.ld_obd->obd_name, rc);
 969                         th->th_result = rc;
 970                         GOTO(stop_master_trans, rc);
 971                 }
 972         }
 973
 974 stop_master_trans:
 975         /* Step 2: Stop the transaction on the master MDT, and fill the
 976          * master transno in the update logs to other MDT. */
 977         if (master_st != NULL && master_st->st_sub_th != NULL) {
 978                 master_st->st_sub_th->th_local = th->th_local;
 979                 if (th->th_sync)
 980                         master_st->st_sub_th->th_sync = th->th_sync;
 981                 master_st->st_sub_th->th_tags = th->th_tags;
 982                 master_st->st_sub_th->th_result = th->th_result;
 983                 rc = dt_trans_stop(env, master_st->st_dt, master_st->st_sub_th);
 984                 if (rc < 0) {
 985                         th->th_result = rc;
 986                         GOTO(stop_other_trans, rc);
 987                 } else if (tur != NULL && tur->tur_update_records != NULL) {
 988                         struct llog_update_record *lur;
 989
 990                         lur = tur->tur_update_records;
 991                         if (lur->lur_update_rec.ur_master_transno == 0)
 992                                 /* Update master transno after master stop
 993                                  * callback */
 994                                 lur->lur_update_rec.ur_master_transno =
 995                                                 tgt_th_info(env)->tti_transno;
 996                 }
 997         }
 998
 999         /* Step 3: write updates to other MDTs */
1000         if (write_updates) {
1001                 struct llog_update_record *lur;
1002
1003                 /* Stop callback of master will add more updates and also update
1004                  * master transno, so merge the parameters and updates into one
1005                  * buffer again */
1006                 rc = prepare_writing_updates(env, tmt);
1007                 if (rc < 0) {
1008                         CERROR("%s: prepare updates failed: rc = %d\n",
1009                                master_dev->dd_lu_dev.ld_obd->obd_name, rc);
1010                         th->th_result = rc;
1011                         GOTO(stop_other_trans, rc);
1012                 }
1013                 lur = tur->tur_update_records;
1014                 list_for_each_entry(st, &tmt->tmt_sub_thandle_list,
1015                                     st_sub_list) {
1016                         if (st->st_sub_th == NULL || st == master_st ||
1017                             st->st_sub_th->th_result < 0)
1018                                 continue;
1019
1020                         rc = sub_updates_write(env, lur, st);
1021                         if (rc < 0) {
1022                                 th->th_result = rc;
1023                                 break;
1024                         }
1025                 }
1026         }
1027
1028 stop_other_trans:
1029         /* Step 4: Stop the transaction on other MDTs */
1030         list_for_each_entry(st, &tmt->tmt_sub_thandle_list, st_sub_list) {
1031                 if (st == master_st || st->st_sub_th == NULL)
1032                         continue;
1033
1034                 if (th->th_sync)
1035                         st->st_sub_th->th_sync = th->th_sync;
1036                 st->st_sub_th->th_local = th->th_local;
1037                 st->st_sub_th->th_tags = th->th_tags;
1038                 st->st_sub_th->th_result = th->th_result;
1039                 rc = dt_trans_stop(env, st->st_sub_th->th_dev,
1040                                    st->st_sub_th);
1041                 if (unlikely(rc < 0 && th->th_result == 0))
1042                         th->th_result = rc;
1043         }
1044
1045         rc = top_trans_wait_result(top_th);
1046
1047         tmt->tmt_result = rc;
1048
1049         /* Balance for the refcount in top_trans_create, Note: if it is NOT
1050          * multiple node transaction, the top transaction will be destroyed. */
1051         top_multiple_thandle_put(tmt);
1052         OBD_FREE_PTR(top_th);
1053         RETURN(rc);
1054 }
1055 EXPORT_SYMBOL(top_trans_stop);
1056
1057 /**
1058  * Create top_multiple_thandle for top_thandle
1059  *
1060  * Create top_mutilple_thandle to manage the mutiple node transaction
1061  * for top_thandle, and it also needs to add master sub thandle to the
1062  * sub trans list now.
1063  *
1064  * \param[in] env       execution environment
1065  * \param[in] top_th    the top thandle
1066  *
1067  * \retval      0 if creation succeeds
1068  * \retval      negative errno if creation fails
1069  */
1070 int top_trans_create_tmt(const struct lu_env *env,
1071                          struct top_thandle *top_th)
1072 {
1073         struct top_multiple_thandle *tmt;
1074
1075         OBD_ALLOC_PTR(tmt);
1076         if (tmt == NULL)
1077                 return -ENOMEM;
1078
1079         tmt->tmt_magic = TOP_THANDLE_MAGIC;
1080         INIT_LIST_HEAD(&tmt->tmt_sub_thandle_list);
1081         INIT_LIST_HEAD(&tmt->tmt_commit_list);
1082         atomic_set(&tmt->tmt_refcount, 1);
1083         spin_lock_init(&tmt->tmt_sub_lock);
1084         init_waitqueue_head(&tmt->tmt_stop_waitq);
1085
1086         top_th->tt_multiple_thandle = tmt;
1087
1088         return 0;
1089 }
1090
1091 static struct sub_thandle *
1092 create_sub_thandle_with_thandle(struct top_thandle *top_th,
1093                                 struct thandle *sub_th)
1094 {
1095         struct sub_thandle *st;
1096
1097         /* create and init sub th to the top trans list */
1098         st = create_sub_thandle(top_th->tt_multiple_thandle,
1099                                 sub_th->th_dev);
1100         if (IS_ERR(st))
1101                 return st;
1102
1103         st->st_sub_th = sub_th;
1104
1105         sub_th->th_top = &top_th->tt_super;
1106         return st;
1107 }
1108
1109 /**
1110  * Get sub thandle.
1111  *
1112  * Get sub thandle from the top thandle according to the sub dt_device.
1113  *
1114  * \param[in] env       execution environment
1115  * \param[in] th        thandle on the top layer.
1116  * \param[in] sub_dt    sub dt_device used to get sub transaction
1117  *
1118  * \retval              thandle of sub transaction if succeed
1119  * \retval              PTR_ERR(errno) if failed
1120  */
1121 struct thandle *thandle_get_sub_by_dt(const struct lu_env *env,
1122                                       struct thandle *th,
1123                                       struct dt_device *sub_dt)
1124 {
1125         struct sub_thandle      *st = NULL;
1126         struct top_thandle      *top_th;
1127         struct thandle          *sub_th = NULL;
1128         int                     rc = 0;
1129         ENTRY;
1130
1131         top_th = container_of(th, struct top_thandle, tt_super);
1132
1133         if (likely(sub_dt == top_th->tt_master_sub_thandle->th_dev))
1134                 RETURN(top_th->tt_master_sub_thandle);
1135
1136         if (top_th->tt_multiple_thandle != NULL) {
1137                 st = lookup_sub_thandle(top_th->tt_multiple_thandle, sub_dt);
1138                 if (st != NULL)
1139                         RETURN(st->st_sub_th);
1140         }
1141
1142         sub_th = dt_trans_create(env, sub_dt);
1143         if (IS_ERR(sub_th))
1144                 RETURN(sub_th);
1145
1146         /* Create top_multiple_thandle if necessary */
1147         if (top_th->tt_multiple_thandle == NULL) {
1148                 struct top_multiple_thandle *tmt;
1149
1150                 rc = top_trans_create_tmt(env, top_th);
1151                 if (rc < 0)
1152                         GOTO(stop_trans, rc);
1153
1154                 tmt = top_th->tt_multiple_thandle;
1155
1156                 /* Add master sub th to the top trans list */
1157                 tmt->tmt_master_sub_dt =
1158                         top_th->tt_master_sub_thandle->th_dev;
1159                 st = create_sub_thandle_with_thandle(top_th,
1160                                 top_th->tt_master_sub_thandle);
1161                 if (IS_ERR(st))
1162                         GOTO(stop_trans, rc = PTR_ERR(st));
1163         }
1164
1165         /* create and init sub th to the top trans list */
1166         st = create_sub_thandle_with_thandle(top_th, sub_th);
1167         st->st_sub_th->th_wait_submit = 1;
1168 stop_trans:
1169         if (rc < 0) {
1170                 if (st != NULL)
1171                         OBD_FREE_PTR(st);
1172                 sub_th->th_result = rc;
1173                 dt_trans_stop(env, sub_dt, sub_th);
1174                 sub_th = ERR_PTR(rc);
1175         }
1176
1177         RETURN(sub_th);
1178 }
1179 EXPORT_SYMBOL(thandle_get_sub_by_dt);
1180
1181 /**
1182  * Top multiple thandle destroy
1183  *
1184  * Destroy multiple thandle and all its sub thandle.
1185  *
1186  * \param[in] tmt       top_multiple_thandle to be destroyed.
1187  */
1188 void top_multiple_thandle_destroy(struct top_multiple_thandle *tmt)
1189 {
1190         struct sub_thandle *st;
1191         struct sub_thandle *tmp;
1192
1193         LASSERT(tmt->tmt_magic == TOP_THANDLE_MAGIC);
1194         list_for_each_entry_safe(st, tmp, &tmt->tmt_sub_thandle_list,
1195                                  st_sub_list) {
1196                 struct sub_thandle_cookie *stc;
1197                 struct sub_thandle_cookie *tmp;
1198
1199                 list_del(&st->st_sub_list);
1200                 list_for_each_entry_safe(stc, tmp, &st->st_cookie_list,
1201                                          stc_list) {
1202                         list_del(&stc->stc_list);
1203                         OBD_FREE_PTR(stc);
1204                 }
1205                 OBD_FREE_PTR(st);
1206         }
1207         OBD_FREE_PTR(tmt);
1208 }
1209 EXPORT_SYMBOL(top_multiple_thandle_destroy);
1210
1211 /**
1212  * Cancel the update log on MDTs
1213  *
1214  * Cancel the update log on MDTs then destroy the thandle.
1215  *
1216  * \param[in] env       execution environment
1217  * \param[in] tmt       the top multiple thandle whose updates records
1218  *                      will be cancelled.
1219  *
1220  * \retval              0 if cancellation succeeds.
1221  * \retval              negative errno if cancellation fails.
1222  */
1223 static int distribute_txn_cancel_records(const struct lu_env *env,
1224                                          struct top_multiple_thandle *tmt)
1225 {
1226         struct sub_thandle *st;
1227         ENTRY;
1228
1229         top_multiple_thandle_dump(tmt, D_INFO);
1230         /* Cancel update logs on other MDTs */
1231         list_for_each_entry(st, &tmt->tmt_sub_thandle_list, st_sub_list) {
1232                 struct llog_ctxt        *ctxt;
1233                 struct obd_device       *obd;
1234                 struct llog_cookie      *cookie;
1235                 struct sub_thandle_cookie *stc;
1236                 int rc;
1237
1238                 obd = st->st_dt->dd_lu_dev.ld_obd;
1239                 ctxt = llog_get_context(obd, LLOG_UPDATELOG_ORIG_CTXT);
1240                 if (ctxt == NULL)
1241                         continue;
1242                 list_for_each_entry(stc, &st->st_cookie_list, stc_list) {
1243                         cookie = &stc->stc_cookie;
1244                         if (fid_is_zero(&cookie->lgc_lgl.lgl_oi.oi_fid))
1245                                 continue;
1246
1247                         rc = llog_cat_cancel_records(env, ctxt->loc_handle, 1,
1248                                                      cookie);
1249                         CDEBUG(D_HA, "%s: batchid %llu cancel update log "
1250                                DOSTID ".%u : rc = %d\n", obd->obd_name,
1251                                tmt->tmt_batchid,
1252                                POSTID(&cookie->lgc_lgl.lgl_oi),
1253                                cookie->lgc_index, rc);
1254                 }
1255
1256                 llog_ctxt_put(ctxt);
1257         }
1258
1259         RETURN(0);
1260 }
1261
1262 /**
1263  * Check if there are committed transaction
1264  *
1265  * Check if there are committed transaction in the distribute transaction
1266  * list, then cancel the update records for those committed transaction.
1267  * Because the distribute transaction in the list are sorted by batchid,
1268  * and cancellation will be done by batchid order, so we only check the first
1269  * the transaction(with lowest batchid) in the list.
1270  *
1271  * \param[in] lod       lod device where cancel thread is
1272  *
1273  * \retval              true if it is ready
1274  * \retval              false if it is not ready
1275  */
1276 static bool tdtd_ready_for_cancel_log(struct target_distribute_txn_data *tdtd)
1277 {
1278         struct top_multiple_thandle     *tmt = NULL;
1279         struct obd_device               *obd = tdtd->tdtd_lut->lut_obd;
1280         bool    ready = false;
1281
1282         spin_lock(&tdtd->tdtd_batchid_lock);
1283         if (!list_empty(&tdtd->tdtd_list)) {
1284                 tmt = list_entry(tdtd->tdtd_list.next,
1285                                  struct top_multiple_thandle, tmt_commit_list);
1286                 if (tmt->tmt_committed &&
1287                     (!obd->obd_recovering || (obd->obd_recovering &&
1288                     tmt->tmt_batchid <= tdtd->tdtd_committed_batchid)))
1289                         ready = true;
1290         }
1291         spin_unlock(&tdtd->tdtd_batchid_lock);
1292
1293         return ready;
1294 }
1295
1296 struct distribute_txn_bid_data {
1297         struct dt_txn_commit_cb  dtbd_cb;
1298         struct target_distribute_txn_data      *dtbd_tdtd;
1299         __u64                    dtbd_batchid;
1300 };
1301
1302 /**
1303  * callback of updating commit batchid
1304  *
1305  * Updating commit batchid then wake up the commit thread to cancel the
1306  * records.
1307  *
1308  * \param[in]env        execution environment
1309  * \param[in]th         thandle to updating commit batchid
1310  * \param[in]cb         commit callback
1311  * \param[in]err        result of thandle
1312  */
1313 static void distribute_txn_batchid_cb(struct lu_env *env,
1314                                       struct thandle *th,
1315                                       struct dt_txn_commit_cb *cb,
1316                                       int err)
1317 {
1318         struct distribute_txn_bid_data          *dtbd = NULL;
1319         struct target_distribute_txn_data       *tdtd;
1320
1321         dtbd = container_of0(cb, struct distribute_txn_bid_data, dtbd_cb);
1322         tdtd = dtbd->dtbd_tdtd;
1323
1324         CDEBUG(D_HA, "%s: %llu batchid updated\n",
1325               tdtd->tdtd_lut->lut_obd->obd_name, dtbd->dtbd_batchid);
1326         spin_lock(&tdtd->tdtd_batchid_lock);
1327         if (dtbd->dtbd_batchid > tdtd->tdtd_committed_batchid &&
1328             !tdtd->tdtd_lut->lut_obd->obd_no_transno)
1329                 tdtd->tdtd_committed_batchid = dtbd->dtbd_batchid;
1330         spin_unlock(&tdtd->tdtd_batchid_lock);
1331         atomic_dec(&tdtd->tdtd_refcount);
1332         wake_up(&tdtd->tdtd_commit_thread_waitq);
1333
1334         OBD_FREE_PTR(dtbd);
1335 }
1336
1337 /**
1338  * Update the commit batchid in disk
1339  *
1340  * Update commit batchid in the disk, after this is committed, it can start
1341  * to cancel the update records.
1342  *
1343  * \param[in] env       execution environment
1344  * \param[in] tdtd      distribute transaction structure
1345  * \param[in] batchid   commit batchid to be updated
1346  *
1347  * \retval              0 if update succeeds.
1348  * \retval              negative errno if update fails.
1349  */
1350 static int
1351 distribute_txn_commit_batchid_update(const struct lu_env *env,
1352                               struct target_distribute_txn_data *tdtd,
1353                               __u64 batchid)
1354 {
1355         struct distribute_txn_bid_data  *dtbd = NULL;
1356         struct thandle          *th;
1357         struct lu_buf            buf;
1358         __u64                    tmp;
1359         __u64                    off;
1360         int                      rc;
1361         ENTRY;
1362
1363         OBD_ALLOC_PTR(dtbd);
1364         if (dtbd == NULL)
1365                 RETURN(-ENOMEM);
1366         dtbd->dtbd_batchid = batchid;
1367         dtbd->dtbd_tdtd = tdtd;
1368         dtbd->dtbd_cb.dcb_func = distribute_txn_batchid_cb;
1369         atomic_inc(&tdtd->tdtd_refcount);
1370
1371         th = dt_trans_create(env, tdtd->tdtd_lut->lut_bottom);
1372         if (IS_ERR(th)) {
1373                 OBD_FREE_PTR(dtbd);
1374                 RETURN(PTR_ERR(th));
1375         }
1376
1377         tmp = cpu_to_le64(batchid);
1378         buf.lb_buf = &tmp;
1379         buf.lb_len = sizeof(tmp);
1380         off = 0;
1381
1382         rc = dt_declare_record_write(env, tdtd->tdtd_batchid_obj, &buf, off,
1383                                      th);
1384         if (rc < 0)
1385                 GOTO(stop, rc);
1386
1387         rc = dt_trans_start_local(env, tdtd->tdtd_lut->lut_bottom, th);
1388         if (rc < 0)
1389                 GOTO(stop, rc);
1390
1391         rc = dt_trans_cb_add(th, &dtbd->dtbd_cb);
1392         if (rc < 0)
1393                 GOTO(stop, rc);
1394
1395         rc = dt_record_write(env, tdtd->tdtd_batchid_obj, &buf,
1396                              &off, th);
1397
1398         CDEBUG(D_INFO, "%s: update batchid "LPU64": rc = %d\n",
1399                tdtd->tdtd_lut->lut_obd->obd_name, batchid, rc);
1400
1401 stop:
1402         dt_trans_stop(env, tdtd->tdtd_lut->lut_bottom, th);
1403         if (rc < 0)
1404                 OBD_FREE_PTR(dtbd);
1405         RETURN(rc);
1406 }
1407
1408 /**
1409  * Init commit batchid for distribute transaction.
1410  *
1411  * Initialize the batchid object and get commit batchid from the object.
1412  *
1413  * \param[in] env       execution environment
1414  * \param[in] tdtd      distribute transaction whose batchid is initialized.
1415  *
1416  * \retval              0 if initialization succeeds.
1417  * \retval              negative errno if initialization fails.
1418  **/
1419 static int
1420 distribute_txn_commit_batchid_init(const struct lu_env *env,
1421                                    struct target_distribute_txn_data *tdtd)
1422 {
1423         struct tgt_thread_info  *tti = tgt_th_info(env);
1424         struct lu_target        *lut = tdtd->tdtd_lut;
1425         struct lu_attr          *attr = &tti->tti_attr;
1426         struct lu_fid           *fid = &tti->tti_fid1;
1427         struct dt_object_format *dof = &tti->tti_u.update.tti_update_dof;
1428         struct dt_object        *dt_obj = NULL;
1429         struct lu_buf           buf;
1430         __u64                   tmp;
1431         __u64                   off;
1432         int                     rc;
1433         ENTRY;
1434
1435         memset(attr, 0, sizeof(*attr));
1436         attr->la_valid = LA_MODE;
1437         attr->la_mode = S_IFREG | S_IRUGO | S_IWUSR;
1438         dof->dof_type = dt_mode_to_dft(S_IFREG);
1439
1440         lu_local_obj_fid(fid, BATCHID_COMMITTED_OID);
1441
1442         dt_obj = dt_find_or_create(env, lut->lut_bottom, fid, dof,
1443                                    attr);
1444         if (IS_ERR(dt_obj)) {
1445                 rc = PTR_ERR(dt_obj);
1446                 dt_obj = NULL;
1447                 GOTO(out_put, rc);
1448         }
1449
1450         tdtd->tdtd_batchid_obj = dt_obj;
1451
1452         buf.lb_buf = &tmp;
1453         buf.lb_len = sizeof(tmp);
1454         off = 0;
1455         rc = dt_read(env, dt_obj, &buf, &off);
1456         if (rc < 0 || (rc < buf.lb_len && rc > 0)) {
1457                 CERROR("%s can't read last committed batchid: rc = %d\n",
1458                        tdtd->tdtd_lut->lut_obd->obd_name, rc);
1459                 if (rc > 0)
1460                         rc = -EINVAL;
1461                 GOTO(out_put, rc);
1462         } else if (rc == buf.lb_len) {
1463                 tdtd->tdtd_committed_batchid = le64_to_cpu(tmp);
1464                 CDEBUG(D_HA, "%s: committed batchid %llu\n",
1465                        tdtd->tdtd_lut->lut_obd->obd_name,
1466                        tdtd->tdtd_committed_batchid);
1467                 rc = 0;
1468         }
1469
1470 out_put:
1471         if (rc < 0 && dt_obj != NULL) {
1472                 lu_object_put(env, &dt_obj->do_lu);
1473                 tdtd->tdtd_batchid_obj = NULL;
1474         }
1475         return rc;
1476 }
1477
1478 /**
1479  * manage the distribute transaction thread
1480  *
1481  * Distribute transaction are linked to the list, and once the distribute
1482  * transaction is committed, it will update the last committed batchid first,
1483  * after it is committed, it will cancel the records.
1484  *
1485  * \param[in] _arg      argument for commit thread
1486  *
1487  * \retval              0 if thread is running successfully
1488  * \retval              negative errno if the thread can not be run.
1489  */
1490 static int distribute_txn_commit_thread(void *_arg)
1491 {
1492         struct target_distribute_txn_data *tdtd = _arg;
1493         struct lu_target        *lut = tdtd->tdtd_lut;
1494         struct ptlrpc_thread    *thread = &lut->lut_tdtd_commit_thread;
1495         struct l_wait_info       lwi = { 0 };
1496         struct lu_env            env;
1497         struct list_head         list;
1498         int                      rc;
1499         struct top_multiple_thandle *tmt;
1500         struct top_multiple_thandle *tmp;
1501         __u64                    batchid = 0, committed;
1502
1503         ENTRY;
1504
1505         rc = lu_env_init(&env, LCT_LOCAL | LCT_MD_THREAD);
1506         if (rc != 0)
1507                 RETURN(rc);
1508
1509         spin_lock(&tdtd->tdtd_batchid_lock);
1510         thread->t_flags = SVC_RUNNING;
1511         spin_unlock(&tdtd->tdtd_batchid_lock);
1512         wake_up(&thread->t_ctl_waitq);
1513         INIT_LIST_HEAD(&list);
1514
1515         CDEBUG(D_HA, "%s: start commit thread committed batchid "LPU64"\n",
1516                tdtd->tdtd_lut->lut_obd->obd_name,
1517                tdtd->tdtd_committed_batchid);
1518
1519         while (distribute_txn_commit_thread_running(lut)) {
1520                 spin_lock(&tdtd->tdtd_batchid_lock);
1521                 list_for_each_entry_safe(tmt, tmp, &tdtd->tdtd_list,
1522                                          tmt_commit_list) {
1523                         if (tmt->tmt_committed == 0)
1524                                 break;
1525
1526                         /* Note: right now, replay is based on master MDT
1527                          * transno, but cancellation is based on batchid.
1528                          * so we do not try to cancel the update log until
1529                          * the recoverying is done, unless the update records
1530                          * batchid < committed_batchid. */
1531                         if (tmt->tmt_batchid <= tdtd->tdtd_committed_batchid) {
1532                                 list_move_tail(&tmt->tmt_commit_list, &list);
1533                         } else if (!tdtd->tdtd_lut->lut_obd->obd_recovering) {
1534                                 LASSERTF(tmt->tmt_batchid >= batchid,
1535                                          "tmt %p tmt_batchid: "LPU64", batchid "
1536                                           LPU64"\n", tmt, tmt->tmt_batchid,
1537                                          batchid);
1538                                 /* There are three types of distribution
1539                                  * transaction result
1540                                  *
1541                                  * 1. If tmt_result < 0, it means the
1542                                  * distribution transaction fails, which should
1543                                  * be rare, because once declare phase succeeds,
1544                                  * the operation should succeeds anyway. Note in
1545                                  * this case, we will still update batchid so
1546                                  * cancellation would be stopped.
1547                                  *
1548                                  * 2. If tmt_result == 0, it means the
1549                                  * distribution transaction succeeds, and we
1550                                  * will update batchid.
1551                                  *
1552                                  * 3. If tmt_result > 0, it means distribute
1553                                  * transaction is not yet committed on every
1554                                  * node, but we need release this tmt before
1555                                  * that, which usuually happens during umount.
1556                                  */
1557                                 if (tmt->tmt_result <= 0)
1558                                         batchid = tmt->tmt_batchid;
1559                                 list_move_tail(&tmt->tmt_commit_list, &list);
1560                         }
1561                 }
1562                 spin_unlock(&tdtd->tdtd_batchid_lock);
1563
1564                 CDEBUG(D_HA, "%s: batchid: "LPU64" committed batchid "
1565                        LPU64"\n", tdtd->tdtd_lut->lut_obd->obd_name, batchid,
1566                        tdtd->tdtd_committed_batchid);
1567                 /* update globally committed on a storage */
1568                 if (batchid > tdtd->tdtd_committed_batchid) {
1569                         distribute_txn_commit_batchid_update(&env, tdtd,
1570                                                              batchid);
1571                         spin_lock(&tdtd->tdtd_batchid_lock);
1572                         if (batchid > tdtd->tdtd_batchid) {
1573                                 /* This might happen during recovery,
1574                                  * batchid is initialized as last transno,
1575                                  * and the batchid in the update records
1576                                  * on other MDTs might be bigger than
1577                                  * the batchid, so we need update it to
1578                                  * avoid duplicate batchid. */
1579                                 CDEBUG(D_HA, "%s update batchid from "LPU64
1580                                        " to "LPU64"\n",
1581                                        tdtd->tdtd_lut->lut_obd->obd_name,
1582                                        tdtd->tdtd_batchid, batchid);
1583                                 tdtd->tdtd_batchid = batchid;
1584                         }
1585                         spin_unlock(&tdtd->tdtd_batchid_lock);
1586                 }
1587                 /* cancel the records for committed batchid's */
1588                 /* XXX: should we postpone cancel's till the end of recovery? */
1589                 committed = tdtd->tdtd_committed_batchid;
1590                 list_for_each_entry_safe(tmt, tmp, &list, tmt_commit_list) {
1591                         if (tmt->tmt_batchid > committed)
1592                                 break;
1593                         list_del_init(&tmt->tmt_commit_list);
1594                         if (tmt->tmt_result <= 0)
1595                                 distribute_txn_cancel_records(&env, tmt);
1596                         top_multiple_thandle_put(tmt);
1597                 }
1598
1599                 l_wait_event(tdtd->tdtd_commit_thread_waitq,
1600                              !distribute_txn_commit_thread_running(lut) ||
1601                              committed < tdtd->tdtd_committed_batchid ||
1602                              tdtd_ready_for_cancel_log(tdtd), &lwi);
1603         };
1604
1605         l_wait_event(tdtd->tdtd_commit_thread_waitq,
1606                      atomic_read(&tdtd->tdtd_refcount) == 0, &lwi);
1607
1608         spin_lock(&tdtd->tdtd_batchid_lock);
1609         list_for_each_entry_safe(tmt, tmp, &tdtd->tdtd_list,
1610                                  tmt_commit_list)
1611                 list_move_tail(&tmt->tmt_commit_list, &list);
1612         spin_unlock(&tdtd->tdtd_batchid_lock);
1613
1614         CDEBUG(D_INFO, "%s stopping distribute txn commit thread.\n",
1615                tdtd->tdtd_lut->lut_obd->obd_name);
1616         list_for_each_entry_safe(tmt, tmp, &list, tmt_commit_list) {
1617                 list_del_init(&tmt->tmt_commit_list);
1618                 top_multiple_thandle_dump(tmt, D_HA);
1619                 top_multiple_thandle_put(tmt);
1620         }
1621
1622         thread->t_flags = SVC_STOPPED;
1623         lu_env_fini(&env);
1624         wake_up(&thread->t_ctl_waitq);
1625
1626         RETURN(0);
1627 }
1628
1629 /**
1630  * Start llog cancel thread
1631  *
1632  * Start llog cancel(master/slave) thread on LOD
1633  *
1634  * \param[in]lclt       cancel log thread to be started.
1635  *
1636  * \retval              0 if the thread is started successfully.
1637  * \retval              negative errno if the thread is not being
1638  *                      started.
1639  */
1640 int distribute_txn_init(const struct lu_env *env,
1641                         struct lu_target *lut,
1642                         struct target_distribute_txn_data *tdtd,
1643                         __u32 index)
1644 {
1645         struct task_struct      *task;
1646         struct l_wait_info       lwi = { 0 };
1647         int                     rc;
1648         ENTRY;
1649
1650         spin_lock_init(&tdtd->tdtd_batchid_lock);
1651         INIT_LIST_HEAD(&tdtd->tdtd_list);
1652
1653         tdtd->tdtd_batchid = lut->lut_last_transno + 1;
1654
1655         init_waitqueue_head(&lut->lut_tdtd_commit_thread.t_ctl_waitq);
1656         init_waitqueue_head(&tdtd->tdtd_commit_thread_waitq);
1657         atomic_set(&tdtd->tdtd_refcount, 0);
1658
1659         tdtd->tdtd_lut = lut;
1660         rc = distribute_txn_commit_batchid_init(env, tdtd);
1661         if (rc != 0)
1662                 RETURN(rc);
1663
1664         task = kthread_run(distribute_txn_commit_thread, tdtd, "tdtd-%u",
1665                            index);
1666         if (IS_ERR(task))
1667                 RETURN(PTR_ERR(task));
1668
1669         l_wait_event(lut->lut_tdtd_commit_thread.t_ctl_waitq,
1670                      distribute_txn_commit_thread_running(lut) ||
1671                      distribute_txn_commit_thread_stopped(lut), &lwi);
1672         RETURN(0);
1673 }
1674 EXPORT_SYMBOL(distribute_txn_init);
1675
1676 /**
1677  * Stop llog cancel thread
1678  *
1679  * Stop llog cancel(master/slave) thread on LOD and also destory
1680  * all of transaction in the list.
1681  *
1682  * \param[in]lclt       cancel log thread to be stopped.
1683  */
1684 void distribute_txn_fini(const struct lu_env *env,
1685                          struct target_distribute_txn_data *tdtd)
1686 {
1687         struct lu_target *lut = tdtd->tdtd_lut;
1688
1689         /* Stop cancel thread */
1690         if (lut == NULL || !distribute_txn_commit_thread_running(lut))
1691                 return;
1692
1693         spin_lock(&tdtd->tdtd_batchid_lock);
1694         lut->lut_tdtd_commit_thread.t_flags = SVC_STOPPING;
1695         spin_unlock(&tdtd->tdtd_batchid_lock);
1696         wake_up(&tdtd->tdtd_commit_thread_waitq);
1697         wait_event(lut->lut_tdtd_commit_thread.t_ctl_waitq,
1698                    lut->lut_tdtd_commit_thread.t_flags & SVC_STOPPED);
1699
1700         dtrq_list_destroy(tdtd);
1701         if (tdtd->tdtd_batchid_obj != NULL) {
1702                 lu_object_put(env, &tdtd->tdtd_batchid_obj->do_lu);
1703                 tdtd->tdtd_batchid_obj = NULL;
1704         }
1705 }
1706 EXPORT_SYMBOL(distribute_txn_fini);