lustre/target/tgt_lastrcvd.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.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2014, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * Lustre Unified Target
  37  * These are common function to work with last_received file
  38  *
  39  * Author: Mikhail Pershin <mike.pershin@intel.com>
  40  */
  41 #include <obd.h>
  42 #include <obd_class.h>
  43 #include <lustre_fid.h>
  44
  45 #include "tgt_internal.h"
  46
  47 static inline struct lu_buf *tti_buf_lsd(struct tgt_thread_info *tti)
  48 {
  49         tti->tti_buf.lb_buf = &tti->tti_lsd;
  50         tti->tti_buf.lb_len = sizeof(tti->tti_lsd);
  51         return &tti->tti_buf;
  52 }
  53
  54 static inline struct lu_buf *tti_buf_lcd(struct tgt_thread_info *tti)
  55 {
  56         tti->tti_buf.lb_buf = &tti->tti_lcd;
  57         tti->tti_buf.lb_len = sizeof(tti->tti_lcd);
  58         return &tti->tti_buf;
  59 }
  60
  61 /**
  62  * Allocate in-memory data for client slot related to export.
  63  */
  64 int tgt_client_alloc(struct obd_export *exp)
  65 {
  66         ENTRY;
  67         LASSERT(exp != exp->exp_obd->obd_self_export);
  68
  69         OBD_ALLOC_PTR(exp->exp_target_data.ted_lcd);
  70         if (exp->exp_target_data.ted_lcd == NULL)
  71                 RETURN(-ENOMEM);
  72         /* Mark that slot is not yet valid, 0 doesn't work here */
  73         exp->exp_target_data.ted_lr_idx = -1;
  74         RETURN(0);
  75 }
  76 EXPORT_SYMBOL(tgt_client_alloc);
  77
  78 /**
  79  * Free in-memory data for client slot related to export.
  80  */
  81 void tgt_client_free(struct obd_export *exp)
  82 {
  83         struct tg_export_data   *ted = &exp->exp_target_data;
  84         struct lu_target        *lut = class_exp2tgt(exp);
  85
  86         LASSERT(exp != exp->exp_obd->obd_self_export);
  87
  88         OBD_FREE_PTR(ted->ted_lcd);
  89         ted->ted_lcd = NULL;
  90
  91         /* Slot may be not yet assigned */
  92         if (ted->ted_lr_idx < 0)
  93                 return;
  94         /* Clear bit when lcd is freed */
  95         LASSERT(lut->lut_client_bitmap);
  96         if (!test_and_clear_bit(ted->ted_lr_idx, lut->lut_client_bitmap)) {
  97                 CERROR("%s: client %u bit already clear in bitmap\n",
  98                        exp->exp_obd->obd_name, ted->ted_lr_idx);
  99                 LBUG();
 100         }
 101 }
 102 EXPORT_SYMBOL(tgt_client_free);
 103
 104 int tgt_client_data_read(const struct lu_env *env, struct lu_target *tgt,
 105                          struct lsd_client_data *lcd, loff_t *off, int index)
 106 {
 107         struct tgt_thread_info  *tti = tgt_th_info(env);
 108         int                      rc;
 109
 110         tti_buf_lcd(tti);
 111         rc = dt_record_read(env, tgt->lut_last_rcvd, &tti->tti_buf, off);
 112         if (rc == 0) {
 113                 check_lcd(tgt->lut_obd->obd_name, index, &tti->tti_lcd);
 114                 lcd_le_to_cpu(&tti->tti_lcd, lcd);
 115                 lcd->lcd_last_result = ptlrpc_status_ntoh(lcd->lcd_last_result);
 116                 lcd->lcd_last_close_result =
 117                         ptlrpc_status_ntoh(lcd->lcd_last_close_result);
 118         }
 119
 120         CDEBUG(D_INFO, "%s: read lcd @%lld uuid = %s, last_transno = "LPU64
 121                ", last_xid = "LPU64", last_result = %u, last_data = %u, "
 122                "last_close_transno = "LPU64", last_close_xid = "LPU64", "
 123                "last_close_result = %u, rc = %d\n", tgt->lut_obd->obd_name,
 124                *off, lcd->lcd_uuid, lcd->lcd_last_transno, lcd->lcd_last_xid,
 125                lcd->lcd_last_result, lcd->lcd_last_data,
 126                lcd->lcd_last_close_transno, lcd->lcd_last_close_xid,
 127                lcd->lcd_last_close_result, rc);
 128         return rc;
 129 }
 130
 131 int tgt_client_data_write(const struct lu_env *env, struct lu_target *tgt,
 132                           struct lsd_client_data *lcd, loff_t *off,
 133                           struct thandle *th)
 134 {
 135         struct tgt_thread_info *tti = tgt_th_info(env);
 136
 137         lcd->lcd_last_result = ptlrpc_status_hton(lcd->lcd_last_result);
 138         lcd->lcd_last_close_result =
 139                 ptlrpc_status_hton(lcd->lcd_last_close_result);
 140         lcd_cpu_to_le(lcd, &tti->tti_lcd);
 141         tti_buf_lcd(tti);
 142
 143         return dt_record_write(env, tgt->lut_last_rcvd, &tti->tti_buf, off, th);
 144 }
 145
 146 /**
 147  * Update client data in last_rcvd
 148  */
 149 static int tgt_client_data_update(const struct lu_env *env,
 150                                   struct obd_export *exp)
 151 {
 152         struct tg_export_data   *ted = &exp->exp_target_data;
 153         struct lu_target        *tgt = class_exp2tgt(exp);
 154         struct tgt_thread_info  *tti = tgt_th_info(env);
 155         struct thandle          *th;
 156         int                      rc = 0;
 157
 158         ENTRY;
 159
 160         th = dt_trans_create(env, tgt->lut_bottom);
 161         if (IS_ERR(th))
 162                 RETURN(PTR_ERR(th));
 163
 164         tti_buf_lcd(tti);
 165         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
 166                                      &tti->tti_buf,
 167                                      ted->ted_lr_off, th);
 168         if (rc)
 169                 GOTO(out, rc);
 170
 171         rc = dt_trans_start_local(env, tgt->lut_bottom, th);
 172         if (rc)
 173                 GOTO(out, rc);
 174         /*
 175          * Until this operations will be committed the sync is needed
 176          * for this export. This should be done _after_ starting the
 177          * transaction so that many connecting clients will not bring
 178          * server down with lots of sync writes.
 179          */
 180         rc = tgt_new_client_cb_add(th, exp);
 181         if (rc) {
 182                 /* can't add callback, do sync now */
 183                 th->th_sync = 1;
 184         } else {
 185                 spin_lock(&exp->exp_lock);
 186                 exp->exp_need_sync = 1;
 187                 spin_unlock(&exp->exp_lock);
 188         }
 189
 190         tti->tti_off = ted->ted_lr_off;
 191         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 192         EXIT;
 193 out:
 194         dt_trans_stop(env, tgt->lut_bottom, th);
 195         CDEBUG(D_INFO, "%s: update last_rcvd client data for UUID = %s, "
 196                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 197                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 198
 199         return rc;
 200 }
 201
 202 int tgt_server_data_read(const struct lu_env *env, struct lu_target *tgt)
 203 {
 204         struct tgt_thread_info  *tti = tgt_th_info(env);
 205         int                      rc;
 206
 207         tti->tti_off = 0;
 208         tti_buf_lsd(tti);
 209         rc = dt_record_read(env, tgt->lut_last_rcvd, &tti->tti_buf,
 210                             &tti->tti_off);
 211         if (rc == 0)
 212                 lsd_le_to_cpu(&tti->tti_lsd, &tgt->lut_lsd);
 213
 214         CDEBUG(D_INFO, "%s: read last_rcvd server data for UUID = %s, "
 215                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 216                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 217         return rc;
 218 }
 219
 220 int tgt_server_data_write(const struct lu_env *env, struct lu_target *tgt,
 221                           struct thandle *th)
 222 {
 223         struct tgt_thread_info  *tti = tgt_th_info(env);
 224         int                      rc;
 225
 226         ENTRY;
 227
 228         tti->tti_off = 0;
 229         tti_buf_lsd(tti);
 230         lsd_cpu_to_le(&tgt->lut_lsd, &tti->tti_lsd);
 231
 232         rc = dt_record_write(env, tgt->lut_last_rcvd, &tti->tti_buf,
 233                              &tti->tti_off, th);
 234
 235         CDEBUG(D_INFO, "%s: write last_rcvd server data for UUID = %s, "
 236                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 237                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 238
 239         RETURN(rc);
 240 }
 241
 242 /**
 243  * Update server data in last_rcvd
 244  */
 245 int tgt_server_data_update(const struct lu_env *env, struct lu_target *tgt,
 246                            int sync)
 247 {
 248         struct tgt_thread_info  *tti = tgt_th_info(env);
 249         struct thandle          *th;
 250         int                      rc = 0;
 251
 252         ENTRY;
 253
 254         CDEBUG(D_SUPER,
 255                "%s: mount_count is "LPU64", last_transno is "LPU64"\n",
 256                tgt->lut_lsd.lsd_uuid, tgt->lut_obd->u.obt.obt_mount_count,
 257                tgt->lut_last_transno);
 258
 259         /* Always save latest transno to keep it fresh */
 260         spin_lock(&tgt->lut_translock);
 261         tgt->lut_lsd.lsd_last_transno = tgt->lut_last_transno;
 262         spin_unlock(&tgt->lut_translock);
 263
 264         th = dt_trans_create(env, tgt->lut_bottom);
 265         if (IS_ERR(th))
 266                 RETURN(PTR_ERR(th));
 267
 268         th->th_sync = sync;
 269
 270         tti_buf_lsd(tti);
 271         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
 272                                      &tti->tti_buf, tti->tti_off, th);
 273         if (rc)
 274                 GOTO(out, rc);
 275
 276         rc = dt_trans_start(env, tgt->lut_bottom, th);
 277         if (rc)
 278                 GOTO(out, rc);
 279
 280         rc = tgt_server_data_write(env, tgt, th);
 281 out:
 282         dt_trans_stop(env, tgt->lut_bottom, th);
 283
 284         CDEBUG(D_INFO, "%s: update last_rcvd server data for UUID = %s, "
 285                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 286                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 287         RETURN(rc);
 288 }
 289 EXPORT_SYMBOL(tgt_server_data_update);
 290
 291 int tgt_truncate_last_rcvd(const struct lu_env *env, struct lu_target *tgt,
 292                            loff_t size)
 293 {
 294         struct dt_object *dt = tgt->lut_last_rcvd;
 295         struct thandle   *th;
 296         struct lu_attr    attr;
 297         int               rc;
 298
 299         ENTRY;
 300
 301         attr.la_size = size;
 302         attr.la_valid = LA_SIZE;
 303
 304         th = dt_trans_create(env, tgt->lut_bottom);
 305         if (IS_ERR(th))
 306                 RETURN(PTR_ERR(th));
 307         rc = dt_declare_punch(env, dt, size, OBD_OBJECT_EOF, th);
 308         if (rc)
 309                 GOTO(cleanup, rc);
 310         rc = dt_declare_attr_set(env, dt, &attr, th);
 311         if (rc)
 312                 GOTO(cleanup, rc);
 313         rc = dt_trans_start_local(env, tgt->lut_bottom, th);
 314         if (rc)
 315                 GOTO(cleanup, rc);
 316
 317         rc = dt_punch(env, dt, size, OBD_OBJECT_EOF, th);
 318         if (rc == 0)
 319                 rc = dt_attr_set(env, dt, &attr, th);
 320
 321 cleanup:
 322         dt_trans_stop(env, tgt->lut_bottom, th);
 323
 324         RETURN(rc);
 325 }
 326
 327 static void tgt_client_epoch_update(const struct lu_env *env,
 328                                     struct obd_export *exp)
 329 {
 330         struct lsd_client_data  *lcd = exp->exp_target_data.ted_lcd;
 331         struct lu_target        *tgt = class_exp2tgt(exp);
 332
 333         LASSERT(tgt->lut_bottom);
 334         /** VBR: set client last_epoch to current epoch */
 335         if (lcd->lcd_last_epoch >= tgt->lut_lsd.lsd_start_epoch)
 336                 return;
 337         lcd->lcd_last_epoch = tgt->lut_lsd.lsd_start_epoch;
 338         tgt_client_data_update(env, exp);
 339 }
 340
 341 /**
 342  * Update boot epoch when recovery ends
 343  */
 344 void tgt_boot_epoch_update(struct lu_target *tgt)
 345 {
 346         struct lu_env            env;
 347         struct ptlrpc_request   *req;
 348         __u32                    start_epoch;
 349         struct list_head         client_list;
 350         int                      rc;
 351
 352         if (tgt->lut_obd->obd_stopping)
 353                 return;
 354
 355         rc = lu_env_init(&env, LCT_DT_THREAD);
 356         if (rc) {
 357                 CERROR("%s: can't initialize environment: rc = %d\n",
 358                         tgt->lut_obd->obd_name, rc);
 359                 return;
 360         }
 361
 362         spin_lock(&tgt->lut_translock);
 363         start_epoch = lr_epoch(tgt->lut_last_transno) + 1;
 364         tgt->lut_last_transno = (__u64)start_epoch << LR_EPOCH_BITS;
 365         tgt->lut_lsd.lsd_start_epoch = start_epoch;
 366         spin_unlock(&tgt->lut_translock);
 367
 368         INIT_LIST_HEAD(&client_list);
 369         /**
 370          * The recovery is not yet finished and final queue can still be updated
 371          * with resend requests. Move final list to separate one for processing
 372          */
 373         spin_lock(&tgt->lut_obd->obd_recovery_task_lock);
 374         list_splice_init(&tgt->lut_obd->obd_final_req_queue, &client_list);
 375         spin_unlock(&tgt->lut_obd->obd_recovery_task_lock);
 376
 377         /**
 378          * go through list of exports participated in recovery and
 379          * set new epoch for them
 380          */
 381         list_for_each_entry(req, &client_list, rq_list) {
 382                 LASSERT(!req->rq_export->exp_delayed);
 383                 if (!req->rq_export->exp_vbr_failed)
 384                         tgt_client_epoch_update(&env, req->rq_export);
 385         }
 386         /** return list back at once */
 387         spin_lock(&tgt->lut_obd->obd_recovery_task_lock);
 388         list_splice_init(&client_list, &tgt->lut_obd->obd_final_req_queue);
 389         spin_unlock(&tgt->lut_obd->obd_recovery_task_lock);
 390         /** update server epoch */
 391         tgt_server_data_update(&env, tgt, 1);
 392         lu_env_fini(&env);
 393 }
 394
 395 /**
 396  * commit callback, need to update last_commited value
 397  */
 398 struct tgt_last_committed_callback {
 399         struct dt_txn_commit_cb  llcc_cb;
 400         struct lu_target        *llcc_tgt;
 401         struct obd_export       *llcc_exp;
 402         __u64                    llcc_transno;
 403 };
 404
 405 static void tgt_cb_last_committed(struct lu_env *env, struct thandle *th,
 406                                   struct dt_txn_commit_cb *cb, int err)
 407 {
 408         struct tgt_last_committed_callback *ccb;
 409
 410         ccb = container_of0(cb, struct tgt_last_committed_callback, llcc_cb);
 411
 412         LASSERT(ccb->llcc_tgt != NULL);
 413         LASSERT(ccb->llcc_exp->exp_obd == ccb->llcc_tgt->lut_obd);
 414
 415         spin_lock(&ccb->llcc_tgt->lut_translock);
 416         if (ccb->llcc_transno > ccb->llcc_tgt->lut_obd->obd_last_committed)
 417                 ccb->llcc_tgt->lut_obd->obd_last_committed = ccb->llcc_transno;
 418
 419         LASSERT(ccb->llcc_exp);
 420         if (ccb->llcc_transno > ccb->llcc_exp->exp_last_committed) {
 421                 ccb->llcc_exp->exp_last_committed = ccb->llcc_transno;
 422                 spin_unlock(&ccb->llcc_tgt->lut_translock);
 423                 ptlrpc_commit_replies(ccb->llcc_exp);
 424         } else {
 425                 spin_unlock(&ccb->llcc_tgt->lut_translock);
 426         }
 427         class_export_cb_put(ccb->llcc_exp);
 428         if (ccb->llcc_transno)
 429                 CDEBUG(D_HA, "%s: transno "LPD64" is committed\n",
 430                        ccb->llcc_tgt->lut_obd->obd_name, ccb->llcc_transno);
 431         OBD_FREE_PTR(ccb);
 432 }
 433
 434 int tgt_last_commit_cb_add(struct thandle *th, struct lu_target *tgt,
 435                            struct obd_export *exp, __u64 transno)
 436 {
 437         struct tgt_last_committed_callback      *ccb;
 438         struct dt_txn_commit_cb                 *dcb;
 439         int                                      rc;
 440
 441         OBD_ALLOC_PTR(ccb);
 442         if (ccb == NULL)
 443                 return -ENOMEM;
 444
 445         ccb->llcc_tgt = tgt;
 446         ccb->llcc_exp = class_export_cb_get(exp);
 447         ccb->llcc_transno = transno;
 448
 449         dcb = &ccb->llcc_cb;
 450         dcb->dcb_func = tgt_cb_last_committed;
 451         INIT_LIST_HEAD(&dcb->dcb_linkage);
 452         strlcpy(dcb->dcb_name, "tgt_cb_last_committed", sizeof(dcb->dcb_name));
 453
 454         rc = dt_trans_cb_add(th, dcb);
 455         if (rc) {
 456                 class_export_cb_put(exp);
 457                 OBD_FREE_PTR(ccb);
 458         }
 459
 460         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 461                 /* report failure to force synchronous operation */
 462                 return -EPERM;
 463
 464         return rc;
 465 }
 466
 467 struct tgt_new_client_callback {
 468         struct dt_txn_commit_cb  lncc_cb;
 469         struct obd_export       *lncc_exp;
 470 };
 471
 472 static void tgt_cb_new_client(struct lu_env *env, struct thandle *th,
 473                               struct dt_txn_commit_cb *cb, int err)
 474 {
 475         struct tgt_new_client_callback *ccb;
 476
 477         ccb = container_of0(cb, struct tgt_new_client_callback, lncc_cb);
 478
 479         LASSERT(ccb->lncc_exp->exp_obd);
 480
 481         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 482                ccb->lncc_exp->exp_obd->obd_name,
 483                ccb->lncc_exp->exp_client_uuid.uuid);
 484
 485         spin_lock(&ccb->lncc_exp->exp_lock);
 486         /* XXX: Currently, we use per-export based sync/async policy for
 487          *      the update via OUT RPC, it is coarse-grained policy, and
 488          *      will be changed as per-request based by DNE II patches. */
 489         if (!ccb->lncc_exp->exp_keep_sync)
 490                 ccb->lncc_exp->exp_need_sync = 0;
 491
 492         spin_unlock(&ccb->lncc_exp->exp_lock);
 493         class_export_cb_put(ccb->lncc_exp);
 494
 495         OBD_FREE_PTR(ccb);
 496 }
 497
 498 int tgt_new_client_cb_add(struct thandle *th, struct obd_export *exp)
 499 {
 500         struct tgt_new_client_callback  *ccb;
 501         struct dt_txn_commit_cb         *dcb;
 502         int                              rc;
 503
 504         OBD_ALLOC_PTR(ccb);
 505         if (ccb == NULL)
 506                 return -ENOMEM;
 507
 508         ccb->lncc_exp = class_export_cb_get(exp);
 509
 510         dcb = &ccb->lncc_cb;
 511         dcb->dcb_func = tgt_cb_new_client;
 512         INIT_LIST_HEAD(&dcb->dcb_linkage);
 513         strlcpy(dcb->dcb_name, "tgt_cb_new_client", sizeof(dcb->dcb_name));
 514
 515         rc = dt_trans_cb_add(th, dcb);
 516         if (rc) {
 517                 class_export_cb_put(exp);
 518                 OBD_FREE_PTR(ccb);
 519         }
 520         return rc;
 521 }
 522
 523 /**
 524  * Add new client to the last_rcvd upon new connection.
 525  *
 526  * We use a bitmap to locate a free space in the last_rcvd file and initialize
 527  * tg_export_data.
 528  */
 529 int tgt_client_new(const struct lu_env *env, struct obd_export *exp)
 530 {
 531         struct tg_export_data   *ted = &exp->exp_target_data;
 532         struct lu_target        *tgt = class_exp2tgt(exp);
 533         int                      rc = 0, idx;
 534
 535         ENTRY;
 536
 537         LASSERT(tgt->lut_client_bitmap != NULL);
 538         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid))
 539                 RETURN(0);
 540
 541         mutex_init(&ted->ted_lcd_lock);
 542
 543         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 544                 RETURN(0);
 545
 546         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 547          * there's no need for extra complication here
 548          */
 549         idx = find_first_zero_bit(tgt->lut_client_bitmap, LR_MAX_CLIENTS);
 550 repeat:
 551         if (idx >= LR_MAX_CLIENTS ||
 552             OBD_FAIL_CHECK(OBD_FAIL_MDS_CLIENT_ADD)) {
 553                 CERROR("%s: no room for %u clients - fix LR_MAX_CLIENTS\n",
 554                        tgt->lut_obd->obd_name,  idx);
 555                 RETURN(-EOVERFLOW);
 556         }
 557         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 558                 idx = find_next_zero_bit(tgt->lut_client_bitmap,
 559                                              LR_MAX_CLIENTS, idx);
 560                 goto repeat;
 561         }
 562
 563         CDEBUG(D_INFO, "%s: client at idx %d with UUID '%s' added\n",
 564                tgt->lut_obd->obd_name, idx, ted->ted_lcd->lcd_uuid);
 565
 566         ted->ted_lr_idx = idx;
 567         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
 568                           idx * tgt->lut_lsd.lsd_client_size;
 569
 570         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 571
 572         CDEBUG(D_INFO, "%s: new client at index %d (%llu) with UUID '%s'\n",
 573                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
 574                ted->ted_lcd->lcd_uuid);
 575
 576         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_CLIENT_ADD))
 577                 RETURN(-ENOSPC);
 578
 579         rc = tgt_client_data_update(env, exp);
 580         if (rc)
 581                 CERROR("%s: Failed to write client lcd at idx %d, rc %d\n",
 582                        tgt->lut_obd->obd_name, idx, rc);
 583
 584         RETURN(rc);
 585 }
 586 EXPORT_SYMBOL(tgt_client_new);
 587
 588 /* Add client data to the MDS.  We use a bitmap to locate a free space
 589  * in the last_rcvd file if cl_off is -1 (i.e. a new client).
 590  * Otherwise, we just have to read the data from the last_rcvd file and
 591  * we know its offset.
 592  *
 593  * It should not be possible to fail adding an existing client - otherwise
 594  * mdt_init_server_data() callsite needs to be fixed.
 595  */
 596 int tgt_client_add(const struct lu_env *env,  struct obd_export *exp, int idx)
 597 {
 598         struct tg_export_data   *ted = &exp->exp_target_data;
 599         struct lu_target        *tgt = class_exp2tgt(exp);
 600
 601         ENTRY;
 602
 603         LASSERT(tgt->lut_client_bitmap != NULL);
 604         LASSERTF(idx >= 0, "%d\n", idx);
 605
 606         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid) ||
 607             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 608                 RETURN(0);
 609
 610         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 611                 CERROR("%s: client %d: bit already set in bitmap!!\n",
 612                        tgt->lut_obd->obd_name,  idx);
 613                 LBUG();
 614         }
 615
 616         CDEBUG(D_INFO, "%s: client at idx %d with UUID '%s' added\n",
 617                tgt->lut_obd->obd_name, idx, ted->ted_lcd->lcd_uuid);
 618
 619         ted->ted_lr_idx = idx;
 620         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
 621                           idx * tgt->lut_lsd.lsd_client_size;
 622
 623         mutex_init(&ted->ted_lcd_lock);
 624
 625         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 626
 627         RETURN(0);
 628 }
 629
 630 int tgt_client_del(const struct lu_env *env, struct obd_export *exp)
 631 {
 632         struct tg_export_data   *ted = &exp->exp_target_data;
 633         struct lu_target        *tgt = class_exp2tgt(exp);
 634         int                      rc;
 635
 636         ENTRY;
 637
 638         LASSERT(ted->ted_lcd);
 639
 640         /* XXX if lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 641         if (!strcmp((char *)ted->ted_lcd->lcd_uuid,
 642                     (char *)tgt->lut_obd->obd_uuid.uuid) ||
 643             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 644                 RETURN(0);
 645
 646         CDEBUG(D_INFO, "%s: del client at idx %u, off %lld, UUID '%s'\n",
 647                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
 648                ted->ted_lcd->lcd_uuid);
 649
 650         /* Clear the bit _after_ zeroing out the client so we don't
 651            race with filter_client_add and zero out new clients.*/
 652         if (!test_bit(ted->ted_lr_idx, tgt->lut_client_bitmap)) {
 653                 CERROR("%s: client %u: bit already clear in bitmap!!\n",
 654                        tgt->lut_obd->obd_name, ted->ted_lr_idx);
 655                 LBUG();
 656         }
 657
 658         /* Do not erase record for recoverable client. */
 659         if (exp->exp_flags & OBD_OPT_FAILOVER)
 660                 RETURN(0);
 661
 662         /* Make sure the server's last_transno is up to date.
 663          * This should be done before zeroing client slot so last_transno will
 664          * be in server data or in client data in case of failure */
 665         rc = tgt_server_data_update(env, tgt, 0);
 666         if (rc != 0) {
 667                 CERROR("%s: failed to update server data, skip client %s "
 668                        "zeroing, rc %d\n", tgt->lut_obd->obd_name,
 669                        ted->ted_lcd->lcd_uuid, rc);
 670                 RETURN(rc);
 671         }
 672
 673         mutex_lock(&ted->ted_lcd_lock);
 674         memset(ted->ted_lcd->lcd_uuid, 0, sizeof ted->ted_lcd->lcd_uuid);
 675         rc = tgt_client_data_update(env, exp);
 676         mutex_unlock(&ted->ted_lcd_lock);
 677
 678         CDEBUG(rc == 0 ? D_INFO : D_ERROR,
 679                "%s: zeroing out client %s at idx %u (%llu), rc %d\n",
 680                tgt->lut_obd->obd_name, ted->ted_lcd->lcd_uuid,
 681                ted->ted_lr_idx, ted->ted_lr_off, rc);
 682         RETURN(rc);
 683 }
 684 EXPORT_SYMBOL(tgt_client_del);
 685
 686 /*
 687  * last_rcvd & last_committed update callbacks
 688  */
 689 static int tgt_last_rcvd_update(const struct lu_env *env, struct lu_target *tgt,
 690                                 struct dt_object *obj, __u64 opdata,
 691                                 struct thandle *th, struct ptlrpc_request *req)
 692 {
 693         struct tgt_thread_info  *tti = tgt_th_info(env);
 694         struct tg_export_data   *ted;
 695         __u64                   *transno_p;
 696         int                      rc = 0;
 697         bool                     lw_client, update = false;
 698
 699         ENTRY;
 700
 701         ted = &req->rq_export->exp_target_data;
 702
 703         lw_client = exp_connect_flags(req->rq_export) & OBD_CONNECT_LIGHTWEIGHT;
 704         if (ted->ted_lr_idx < 0 && !lw_client)
 705                 /* ofd connect may cause transaction before export has
 706                  * last_rcvd slot */
 707                 RETURN(0);
 708
 709         tti->tti_transno = lustre_msg_get_transno(req->rq_reqmsg);
 710
 711         spin_lock(&tgt->lut_translock);
 712         if (th->th_result != 0) {
 713                 if (tti->tti_transno != 0) {
 714                         CERROR("%s: replay transno "LPU64" failed: rc = %d\n",
 715                                tgt_name(tgt), tti->tti_transno, th->th_result);
 716                 }
 717         } else if (tti->tti_transno == 0) {
 718                 tti->tti_transno = ++tgt->lut_last_transno;
 719         } else {
 720                 /* should be replay */
 721                 if (tti->tti_transno > tgt->lut_last_transno)
 722                         tgt->lut_last_transno = tti->tti_transno;
 723         }
 724         spin_unlock(&tgt->lut_translock);
 725
 726         /** VBR: set new versions */
 727         if (th->th_result == 0 && obj != NULL)
 728                 dt_version_set(env, obj, tti->tti_transno, th);
 729
 730         /* filling reply data */
 731         CDEBUG(D_INODE, "transno = "LPU64", last_committed = "LPU64"\n",
 732                tti->tti_transno, tgt->lut_obd->obd_last_committed);
 733
 734         req->rq_transno = tti->tti_transno;
 735         lustre_msg_set_transno(req->rq_repmsg, tti->tti_transno);
 736
 737         /* if can't add callback, do sync write */
 738         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, req->rq_export,
 739                                                 tti->tti_transno);
 740
 741         if (lw_client) {
 742                 /* All operations performed by LW clients are synchronous and
 743                  * we store the committed transno in the last_rcvd header */
 744                 spin_lock(&tgt->lut_translock);
 745                 if (tti->tti_transno > tgt->lut_lsd.lsd_last_transno) {
 746                         tgt->lut_lsd.lsd_last_transno = tti->tti_transno;
 747                         update = true;
 748                 }
 749                 spin_unlock(&tgt->lut_translock);
 750                 /* Although lightweight (LW) connections have no slot in
 751                  * last_rcvd, we still want to maintain the in-memory
 752                  * lsd_client_data structure in order to properly handle reply
 753                  * reconstruction. */
 754         } else if (ted->ted_lr_off == 0) {
 755                 CERROR("%s: client idx %d has offset %lld\n",
 756                        tgt_name(tgt), ted->ted_lr_idx, ted->ted_lr_off);
 757                 RETURN(-EINVAL);
 758         }
 759
 760         /* if the export has already been disconnected, we have no last_rcvd
 761          * slot, update server data with latest transno then */
 762         if (ted->ted_lcd == NULL) {
 763                 CWARN("commit transaction for disconnected client %s: rc %d\n",
 764                       req->rq_export->exp_client_uuid.uuid, rc);
 765                 GOTO(srv_update, rc = 0);
 766         }
 767
 768         mutex_lock(&ted->ted_lcd_lock);
 769         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
 770         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
 771             lustre_msg_get_opc(req->rq_reqmsg) == MDS_DONE_WRITING) {
 772                 transno_p = &ted->ted_lcd->lcd_last_close_transno;
 773                 ted->ted_lcd->lcd_last_close_xid = req->rq_xid;
 774                 ted->ted_lcd->lcd_last_close_result = th->th_result;
 775         } else {
 776                 /* VBR: save versions in last_rcvd for reconstruct. */
 777                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
 778
 779                 if (pre_versions) {
 780                         ted->ted_lcd->lcd_pre_versions[0] = pre_versions[0];
 781                         ted->ted_lcd->lcd_pre_versions[1] = pre_versions[1];
 782                         ted->ted_lcd->lcd_pre_versions[2] = pre_versions[2];
 783                         ted->ted_lcd->lcd_pre_versions[3] = pre_versions[3];
 784                 }
 785                 transno_p = &ted->ted_lcd->lcd_last_transno;
 786                 ted->ted_lcd->lcd_last_xid = req->rq_xid;
 787                 ted->ted_lcd->lcd_last_result = th->th_result;
 788                 /* XXX: lcd_last_data is __u32 but intent_dispostion is __u64,
 789                  * see struct ldlm_reply->lock_policy_res1; */
 790                 ted->ted_lcd->lcd_last_data = opdata;
 791         }
 792
 793         /* Update transno in slot only if non-zero number, i.e. no errors */
 794         if (likely(tti->tti_transno != 0)) {
 795                 if (*transno_p > tti->tti_transno &&
 796                     !tgt->lut_no_reconstruct) {
 797                         CERROR("%s: trying to overwrite bigger transno:"
 798                                "on-disk: "LPU64", new: "LPU64" replay: %d. "
 799                                "see LU-617.\n", tgt_name(tgt), *transno_p,
 800                                tti->tti_transno, req_is_replay(req));
 801                         if (req_is_replay(req)) {
 802                                 spin_lock(&req->rq_export->exp_lock);
 803                                 req->rq_export->exp_vbr_failed = 1;
 804                                 spin_unlock(&req->rq_export->exp_lock);
 805                         }
 806                         mutex_unlock(&ted->ted_lcd_lock);
 807                         RETURN(req_is_replay(req) ? -EOVERFLOW : 0);
 808                 }
 809                 *transno_p = tti->tti_transno;
 810         }
 811
 812         if (!lw_client) {
 813                 tti->tti_off = ted->ted_lr_off;
 814                 rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 815                 if (rc < 0) {
 816                         mutex_unlock(&ted->ted_lcd_lock);
 817                         RETURN(rc);
 818                 }
 819         }
 820         mutex_unlock(&ted->ted_lcd_lock);
 821         EXIT;
 822 srv_update:
 823         if (update)
 824                 rc = tgt_server_data_write(env, tgt, th);
 825         return rc;
 826 }
 827
 828 /*
 829  * last_rcvd update for echo client simulation.
 830  * It updates last_rcvd client slot and version of object in
 831  * simple way but with all locks to simulate all drawbacks
 832  */
 833 static int tgt_last_rcvd_update_echo(const struct lu_env *env,
 834                                      struct lu_target *tgt,
 835                                      struct dt_object *obj,
 836                                      struct thandle *th,
 837                                      struct obd_export *exp)
 838 {
 839         struct tgt_thread_info  *tti = tgt_th_info(env);
 840         struct tg_export_data   *ted = &exp->exp_target_data;
 841         int                      rc = 0;
 842
 843         ENTRY;
 844
 845         tti->tti_transno = 0;
 846
 847         spin_lock(&tgt->lut_translock);
 848         if (th->th_result == 0)
 849                 tti->tti_transno = ++tgt->lut_last_transno;
 850         spin_unlock(&tgt->lut_translock);
 851
 852         /** VBR: set new versions */
 853         if (th->th_result == 0 && obj != NULL)
 854                 dt_version_set(env, obj, tti->tti_transno, th);
 855
 856         /* if can't add callback, do sync write */
 857         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, exp,
 858                                                 tti->tti_transno);
 859
 860         LASSERT(ted->ted_lr_off > 0);
 861
 862         mutex_lock(&ted->ted_lcd_lock);
 863         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
 864         ted->ted_lcd->lcd_last_transno = tti->tti_transno;
 865         ted->ted_lcd->lcd_last_result = th->th_result;
 866
 867         tti->tti_off = ted->ted_lr_off;
 868         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 869         mutex_unlock(&ted->ted_lcd_lock);
 870         RETURN(rc);
 871 }
 872
 873 static int tgt_clients_data_init(const struct lu_env *env,
 874                                  struct lu_target *tgt,
 875                                  unsigned long last_size)
 876 {
 877         struct obd_device       *obd = tgt->lut_obd;
 878         struct lr_server_data   *lsd = &tgt->lut_lsd;
 879         struct lsd_client_data  *lcd = NULL;
 880         struct tg_export_data   *ted;
 881         int                      cl_idx;
 882         int                      rc = 0;
 883         loff_t                   off = lsd->lsd_client_start;
 884
 885         ENTRY;
 886
 887         CLASSERT(offsetof(struct lsd_client_data, lcd_padding) +
 888                  sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
 889
 890         OBD_ALLOC_PTR(lcd);
 891         if (lcd == NULL)
 892                 RETURN(-ENOMEM);
 893
 894         for (cl_idx = 0; off < last_size; cl_idx++) {
 895                 struct obd_export       *exp;
 896                 __u64                    last_transno;
 897
 898                 /* Don't assume off is incremented properly by
 899                  * read_record(), in case sizeof(*lcd)
 900                  * isn't the same as fsd->lsd_client_size.  */
 901                 off = lsd->lsd_client_start + cl_idx * lsd->lsd_client_size;
 902                 rc = tgt_client_data_read(env, tgt, lcd, &off, cl_idx);
 903                 if (rc) {
 904                         CERROR("%s: error reading last_rcvd %s idx %d off "
 905                                "%llu: rc = %d\n", tgt_name(tgt), LAST_RCVD,
 906                                cl_idx, off, rc);
 907                         rc = 0;
 908                         break; /* read error shouldn't cause startup to fail */
 909                 }
 910
 911                 if (lcd->lcd_uuid[0] == '\0') {
 912                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
 913                                cl_idx);
 914                         continue;
 915                 }
 916
 917                 last_transno = lcd_last_transno(lcd);
 918
 919                 /* These exports are cleaned up by disconnect, so they
 920                  * need to be set up like real exports as connect does.
 921                  */
 922                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
 923                        " srv lr: "LPU64" lx: "LPU64"\n", lcd->lcd_uuid, cl_idx,
 924                        last_transno, lsd->lsd_last_transno, lcd_last_xid(lcd));
 925
 926                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
 927                 if (IS_ERR(exp)) {
 928                         if (PTR_ERR(exp) == -EALREADY) {
 929                                 /* export already exists, zero out this one */
 930                                 CERROR("%s: Duplicate export %s!\n",
 931                                        tgt_name(tgt), lcd->lcd_uuid);
 932                                 continue;
 933                         }
 934                         GOTO(err_out, rc = PTR_ERR(exp));
 935                 }
 936
 937                 ted = &exp->exp_target_data;
 938                 *ted->ted_lcd = *lcd;
 939
 940                 rc = tgt_client_add(env, exp, cl_idx);
 941                 LASSERTF(rc == 0, "rc = %d\n", rc); /* can't fail existing */
 942                 /* VBR: set export last committed version */
 943                 exp->exp_last_committed = last_transno;
 944                 spin_lock(&exp->exp_lock);
 945                 exp->exp_connecting = 0;
 946                 exp->exp_in_recovery = 0;
 947                 spin_unlock(&exp->exp_lock);
 948                 obd->obd_max_recoverable_clients++;
 949                 class_export_put(exp);
 950
 951                 /* Need to check last_rcvd even for duplicated exports. */
 952                 CDEBUG(D_OTHER, "client at idx %d has last_transno = "LPU64"\n",
 953                        cl_idx, last_transno);
 954
 955                 spin_lock(&tgt->lut_translock);
 956                 tgt->lut_last_transno = max(last_transno,
 957                                             tgt->lut_last_transno);
 958                 spin_unlock(&tgt->lut_translock);
 959         }
 960
 961 err_out:
 962         OBD_FREE_PTR(lcd);
 963         RETURN(rc);
 964 }
 965
 966 struct server_compat_data {
 967         __u32 rocompat;
 968         __u32 incompat;
 969         __u32 rocinit;
 970         __u32 incinit;
 971 };
 972
 973 static struct server_compat_data tgt_scd[] = {
 974         [LDD_F_SV_TYPE_MDT] = {
 975                 .rocompat = OBD_ROCOMPAT_LOVOBJID,
 976                 .incompat = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
 977                             OBD_INCOMPAT_FID | OBD_INCOMPAT_IAM_DIR |
 978                             OBD_INCOMPAT_LMM_VER | OBD_INCOMPAT_MULTI_OI,
 979                 .rocinit = OBD_ROCOMPAT_LOVOBJID,
 980                 .incinit = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
 981                            OBD_INCOMPAT_MULTI_OI,
 982         },
 983         [LDD_F_SV_TYPE_OST] = {
 984                 .rocompat = OBD_ROCOMPAT_IDX_IN_IDIF,
 985                 .incompat = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR |
 986                             OBD_INCOMPAT_FID,
 987                 .rocinit = OBD_ROCOMPAT_IDX_IN_IDIF,
 988                 .incinit = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR,
 989         }
 990 };
 991
 992 int tgt_server_data_init(const struct lu_env *env, struct lu_target *tgt)
 993 {
 994         struct tgt_thread_info          *tti = tgt_th_info(env);
 995         struct lr_server_data           *lsd = &tgt->lut_lsd;
 996         unsigned long                    last_rcvd_size;
 997         __u32                            index;
 998         int                              rc, type;
 999
1000         rc = dt_attr_get(env, tgt->lut_last_rcvd, &tti->tti_attr);
1001         if (rc)
1002                 RETURN(rc);
1003
1004         last_rcvd_size = (unsigned long)tti->tti_attr.la_size;
1005
1006         /* ensure padding in the struct is the correct size */
1007         CLASSERT(offsetof(struct lr_server_data, lsd_padding) +
1008                  sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
1009
1010         rc = server_name2index(tgt_name(tgt), &index, NULL);
1011         if (rc < 0) {
1012                 CERROR("%s: Can not get index from name: rc = %d\n",
1013                        tgt_name(tgt), rc);
1014                 RETURN(rc);
1015         }
1016         /* server_name2index() returns type */
1017         type = rc;
1018         if (type != LDD_F_SV_TYPE_MDT && type != LDD_F_SV_TYPE_OST) {
1019                 CERROR("%s: unknown target type %x\n", tgt_name(tgt), type);
1020                 RETURN(-EINVAL);
1021         }
1022
1023         /* last_rcvd on OST doesn't provide reconstruct support because there
1024          * may be up to 8 in-flight write requests per single slot in
1025          * last_rcvd client data
1026          */
1027         tgt->lut_no_reconstruct = (type == LDD_F_SV_TYPE_OST);
1028
1029         if (last_rcvd_size == 0) {
1030                 LCONSOLE_WARN("%s: new disk, initializing\n", tgt_name(tgt));
1031
1032                 memcpy(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid,
1033                        sizeof(lsd->lsd_uuid));
1034                 lsd->lsd_last_transno = 0;
1035                 lsd->lsd_mount_count = 0;
1036                 lsd->lsd_server_size = LR_SERVER_SIZE;
1037                 lsd->lsd_client_start = LR_CLIENT_START;
1038                 lsd->lsd_client_size = LR_CLIENT_SIZE;
1039                 lsd->lsd_subdir_count = OBJ_SUBDIR_COUNT;
1040                 lsd->lsd_osd_index = index;
1041                 lsd->lsd_feature_rocompat = tgt_scd[type].rocinit;
1042                 lsd->lsd_feature_incompat = tgt_scd[type].incinit;
1043         } else {
1044                 rc = tgt_server_data_read(env, tgt);
1045                 if (rc) {
1046                         CERROR("%s: error reading LAST_RCVD: rc= %d\n",
1047                                tgt_name(tgt), rc);
1048                         RETURN(rc);
1049                 }
1050                 if (strcmp(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid)) {
1051                         LCONSOLE_ERROR_MSG(0x157, "Trying to start OBD %s "
1052                                            "using the wrong disk %s. Were the"
1053                                            " /dev/ assignments rearranged?\n",
1054                                            tgt->lut_obd->obd_uuid.uuid,
1055                                            lsd->lsd_uuid);
1056                         RETURN(-EINVAL);
1057                 }
1058
1059                 if (lsd->lsd_osd_index != index) {
1060                         LCONSOLE_ERROR_MSG(0x157, "%s: index %d in last rcvd "
1061                                            "is different with the index %d in"
1062                                            "config log, It might be disk"
1063                                            "corruption!\n", tgt_name(tgt),
1064                                            lsd->lsd_osd_index, index);
1065                         RETURN(-EINVAL);
1066                 }
1067         }
1068
1069         if (lsd->lsd_feature_incompat & ~tgt_scd[type].incompat) {
1070                 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
1071                        tgt_name(tgt),
1072                        lsd->lsd_feature_incompat & ~tgt_scd[type].incompat);
1073                 RETURN(-EINVAL);
1074         }
1075
1076         if (type == LDD_F_SV_TYPE_MDT)
1077                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
1078
1079         if (lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat) {
1080                 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
1081                        tgt_name(tgt),
1082                        lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat);
1083                 RETURN(-EINVAL);
1084         }
1085         /** Interop: evict all clients at first boot with 1.8 last_rcvd */
1086         if (type == LDD_F_SV_TYPE_MDT &&
1087             !(lsd->lsd_feature_compat & OBD_COMPAT_20)) {
1088                 if (last_rcvd_size > lsd->lsd_client_start) {
1089                         LCONSOLE_WARN("%s: mounting at first time on 1.8 FS, "
1090                                       "remove all clients for interop needs\n",
1091                                       tgt_name(tgt));
1092                         rc = tgt_truncate_last_rcvd(env, tgt,
1093                                                     lsd->lsd_client_start);
1094                         if (rc)
1095                                 RETURN(rc);
1096                         last_rcvd_size = lsd->lsd_client_start;
1097                 }
1098                 /** set 2.0 flag to upgrade/downgrade between 1.8 and 2.0 */
1099                 lsd->lsd_feature_compat |= OBD_COMPAT_20;
1100         }
1101
1102         spin_lock(&tgt->lut_translock);
1103         tgt->lut_last_transno = lsd->lsd_last_transno;
1104         spin_unlock(&tgt->lut_translock);
1105
1106         lsd->lsd_mount_count++;
1107
1108         CDEBUG(D_INODE, "=======,=BEGIN DUMPING LAST_RCVD========\n");
1109         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
1110                tgt_name(tgt), tgt->lut_last_transno);
1111         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
1112                tgt_name(tgt), lsd->lsd_mount_count);
1113         CDEBUG(D_INODE, "%s: server data size: %u\n",
1114                tgt_name(tgt), lsd->lsd_server_size);
1115         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
1116                tgt_name(tgt), lsd->lsd_client_start);
1117         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
1118                tgt_name(tgt), lsd->lsd_client_size);
1119         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
1120                tgt_name(tgt), last_rcvd_size);
1121         CDEBUG(D_INODE, "%s: server subdir_count: %u\n",
1122                tgt_name(tgt), lsd->lsd_subdir_count);
1123         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", tgt_name(tgt),
1124                last_rcvd_size <= lsd->lsd_client_start ? 0 :
1125                (last_rcvd_size - lsd->lsd_client_start) /
1126                 lsd->lsd_client_size);
1127         CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
1128
1129         if (lsd->lsd_server_size == 0 || lsd->lsd_client_start == 0 ||
1130             lsd->lsd_client_size == 0) {
1131                 CERROR("%s: bad last_rcvd contents!\n", tgt_name(tgt));
1132                 RETURN(-EINVAL);
1133         }
1134
1135         if (!tgt->lut_obd->obd_replayable)
1136                 CWARN("%s: recovery support OFF\n", tgt_name(tgt));
1137
1138         rc = tgt_clients_data_init(env, tgt, last_rcvd_size);
1139         if (rc < 0)
1140                 GOTO(err_client, rc);
1141
1142         spin_lock(&tgt->lut_translock);
1143         /* obd_last_committed is used for compatibility
1144          * with other lustre recovery code */
1145         tgt->lut_obd->obd_last_committed = tgt->lut_last_transno;
1146         spin_unlock(&tgt->lut_translock);
1147
1148         tgt->lut_obd->u.obt.obt_mount_count = lsd->lsd_mount_count;
1149         tgt->lut_obd->u.obt.obt_instance = (__u32)lsd->lsd_mount_count;
1150
1151         /* save it, so mount count and last_transno is current */
1152         rc = tgt_server_data_update(env, tgt, 0);
1153         if (rc < 0)
1154                 GOTO(err_client, rc);
1155
1156         RETURN(0);
1157
1158 err_client:
1159         class_disconnect_exports(tgt->lut_obd);
1160         return rc;
1161 }
1162
1163 /* add credits for last_rcvd update */
1164 int tgt_txn_start_cb(const struct lu_env *env, struct thandle *th,
1165                      void *cookie)
1166 {
1167         struct lu_target        *tgt = cookie;
1168         struct tgt_session_info *tsi;
1169         struct tgt_thread_info  *tti = tgt_th_info(env);
1170         int                      rc;
1171
1172         /* if there is no session, then this transaction is not result of
1173          * request processing but some local operation */
1174         if (env->le_ses == NULL)
1175                 return 0;
1176
1177         LASSERT(tgt->lut_last_rcvd);
1178         tsi = tgt_ses_info(env);
1179         /* OFD may start transaction without export assigned */
1180         if (tsi->tsi_exp == NULL)
1181                 return 0;
1182
1183         tti_buf_lcd(tti);
1184         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
1185                                      &tti->tti_buf,
1186                                      tsi->tsi_exp->exp_target_data.ted_lr_off,
1187                                      th);
1188         if (rc)
1189                 return rc;
1190
1191         tti_buf_lsd(tti);
1192         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
1193                                      &tti->tti_buf, 0, th);
1194         if (rc)
1195                 return rc;
1196
1197         if (tsi->tsi_vbr_obj != NULL &&
1198             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu))
1199                 rc = dt_declare_version_set(env, tsi->tsi_vbr_obj, th);
1200
1201         return rc;
1202 }
1203
1204 /* Update last_rcvd records with latests transaction data */
1205 int tgt_txn_stop_cb(const struct lu_env *env, struct thandle *th,
1206                     void *cookie)
1207 {
1208         struct lu_target        *tgt = cookie;
1209         struct tgt_session_info *tsi;
1210         struct tgt_thread_info  *tti = tgt_th_info(env);
1211         struct dt_object        *obj = NULL;
1212         int                      rc;
1213         bool                     echo_client;
1214
1215         if (env->le_ses == NULL)
1216                 return 0;
1217
1218         tsi = tgt_ses_info(env);
1219         /* OFD may start transaction without export assigned */
1220         if (tsi->tsi_exp == NULL)
1221                 return 0;
1222
1223         echo_client = (tgt_ses_req(tsi) == NULL);
1224
1225         if (tti->tti_has_trans && !echo_client) {
1226                 if (tti->tti_mult_trans == 0) {
1227                         CDEBUG(D_HA, "More than one transaction "LPU64"\n",
1228                                tti->tti_transno);
1229                         RETURN(0);
1230                 }
1231                 /* we need another transno to be assigned */
1232                 tti->tti_transno = 0;
1233         } else if (th->th_result == 0) {
1234                 tti->tti_has_trans = 1;
1235         }
1236
1237         if (tsi->tsi_vbr_obj != NULL &&
1238             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu)) {
1239                 obj = tsi->tsi_vbr_obj;
1240         }
1241
1242         if (unlikely(echo_client)) /* echo client special case */
1243                 rc = tgt_last_rcvd_update_echo(env, tgt, obj, th,
1244                                                tsi->tsi_exp);
1245         else
1246                 rc = tgt_last_rcvd_update(env, tgt, obj, tsi->tsi_opdata, th,
1247                                           tgt_ses_req(tsi));
1248         return rc;
1249 }