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->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         if (unlikely(tgt == NULL)) {
 161                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
 162                           class_exp2obd(exp)->obd_name);
 163                 RETURN(-EINVAL);
 164         }
 165
 166         th = dt_trans_create(env, tgt->lut_bottom);
 167         if (IS_ERR(th))
 168                 RETURN(PTR_ERR(th));
 169
 170         tti_buf_lcd(tti);
 171         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
 172                                      &tti->tti_buf,
 173                                      ted->ted_lr_off, th);
 174         if (rc)
 175                 GOTO(out, rc);
 176
 177         rc = dt_trans_start_local(env, tgt->lut_bottom, th);
 178         if (rc)
 179                 GOTO(out, rc);
 180         /*
 181          * Until this operations will be committed the sync is needed
 182          * for this export. This should be done _after_ starting the
 183          * transaction so that many connecting clients will not bring
 184          * server down with lots of sync writes.
 185          */
 186         rc = tgt_new_client_cb_add(th, exp);
 187         if (rc) {
 188                 /* can't add callback, do sync now */
 189                 th->th_sync = 1;
 190         } else {
 191                 spin_lock(&exp->exp_lock);
 192                 exp->exp_need_sync = 1;
 193                 spin_unlock(&exp->exp_lock);
 194         }
 195
 196         tti->tti_off = ted->ted_lr_off;
 197         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 198         EXIT;
 199 out:
 200         dt_trans_stop(env, tgt->lut_bottom, th);
 201         CDEBUG(D_INFO, "%s: update last_rcvd client data for UUID = %s, "
 202                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 203                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 204
 205         return rc;
 206 }
 207
 208 int tgt_server_data_read(const struct lu_env *env, struct lu_target *tgt)
 209 {
 210         struct tgt_thread_info  *tti = tgt_th_info(env);
 211         int                      rc;
 212
 213         tti->tti_off = 0;
 214         tti_buf_lsd(tti);
 215         rc = dt_record_read(env, tgt->lut_last_rcvd, &tti->tti_buf,
 216                             &tti->tti_off);
 217         if (rc == 0)
 218                 lsd_le_to_cpu(&tti->tti_lsd, &tgt->lut_lsd);
 219
 220         CDEBUG(D_INFO, "%s: read last_rcvd server data for UUID = %s, "
 221                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 222                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 223         return rc;
 224 }
 225
 226 int tgt_server_data_write(const struct lu_env *env, struct lu_target *tgt,
 227                           struct thandle *th)
 228 {
 229         struct tgt_thread_info  *tti = tgt_th_info(env);
 230         int                      rc;
 231
 232         ENTRY;
 233
 234         tti->tti_off = 0;
 235         tti_buf_lsd(tti);
 236         lsd_cpu_to_le(&tgt->lut_lsd, &tti->tti_lsd);
 237
 238         rc = dt_record_write(env, tgt->lut_last_rcvd, &tti->tti_buf,
 239                              &tti->tti_off, th);
 240
 241         CDEBUG(D_INFO, "%s: write last_rcvd server data for UUID = %s, "
 242                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 243                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 244
 245         RETURN(rc);
 246 }
 247
 248 /**
 249  * Update server data in last_rcvd
 250  */
 251 int tgt_server_data_update(const struct lu_env *env, struct lu_target *tgt,
 252                            int sync)
 253 {
 254         struct tgt_thread_info  *tti = tgt_th_info(env);
 255         struct thandle          *th;
 256         int                      rc = 0;
 257
 258         ENTRY;
 259
 260         CDEBUG(D_SUPER,
 261                "%s: mount_count is "LPU64", last_transno is "LPU64"\n",
 262                tgt->lut_lsd.lsd_uuid, tgt->lut_obd->u.obt.obt_mount_count,
 263                tgt->lut_last_transno);
 264
 265         /* Always save latest transno to keep it fresh */
 266         spin_lock(&tgt->lut_translock);
 267         tgt->lut_lsd.lsd_last_transno = tgt->lut_last_transno;
 268         spin_unlock(&tgt->lut_translock);
 269
 270         th = dt_trans_create(env, tgt->lut_bottom);
 271         if (IS_ERR(th))
 272                 RETURN(PTR_ERR(th));
 273
 274         th->th_sync = sync;
 275
 276         tti_buf_lsd(tti);
 277         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
 278                                      &tti->tti_buf, tti->tti_off, th);
 279         if (rc)
 280                 GOTO(out, rc);
 281
 282         rc = dt_trans_start(env, tgt->lut_bottom, th);
 283         if (rc)
 284                 GOTO(out, rc);
 285
 286         rc = tgt_server_data_write(env, tgt, th);
 287 out:
 288         dt_trans_stop(env, tgt->lut_bottom, th);
 289
 290         CDEBUG(D_INFO, "%s: update last_rcvd server data for UUID = %s, "
 291                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 292                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 293         RETURN(rc);
 294 }
 295 EXPORT_SYMBOL(tgt_server_data_update);
 296
 297 int tgt_truncate_last_rcvd(const struct lu_env *env, struct lu_target *tgt,
 298                            loff_t size)
 299 {
 300         struct dt_object *dt = tgt->lut_last_rcvd;
 301         struct thandle   *th;
 302         struct lu_attr    attr;
 303         int               rc;
 304
 305         ENTRY;
 306
 307         attr.la_size = size;
 308         attr.la_valid = LA_SIZE;
 309
 310         th = dt_trans_create(env, tgt->lut_bottom);
 311         if (IS_ERR(th))
 312                 RETURN(PTR_ERR(th));
 313         rc = dt_declare_punch(env, dt, size, OBD_OBJECT_EOF, th);
 314         if (rc)
 315                 GOTO(cleanup, rc);
 316         rc = dt_declare_attr_set(env, dt, &attr, th);
 317         if (rc)
 318                 GOTO(cleanup, rc);
 319         rc = dt_trans_start_local(env, tgt->lut_bottom, th);
 320         if (rc)
 321                 GOTO(cleanup, rc);
 322
 323         rc = dt_punch(env, dt, size, OBD_OBJECT_EOF, th);
 324         if (rc == 0)
 325                 rc = dt_attr_set(env, dt, &attr, th);
 326
 327 cleanup:
 328         dt_trans_stop(env, tgt->lut_bottom, th);
 329
 330         RETURN(rc);
 331 }
 332
 333 static void tgt_client_epoch_update(const struct lu_env *env,
 334                                     struct obd_export *exp)
 335 {
 336         struct lsd_client_data  *lcd = exp->exp_target_data.ted_lcd;
 337         struct lu_target        *tgt = class_exp2tgt(exp);
 338
 339         LASSERT(tgt && tgt->lut_bottom);
 340         /** VBR: set client last_epoch to current epoch */
 341         if (lcd->lcd_last_epoch >= tgt->lut_lsd.lsd_start_epoch)
 342                 return;
 343         lcd->lcd_last_epoch = tgt->lut_lsd.lsd_start_epoch;
 344         tgt_client_data_update(env, exp);
 345 }
 346
 347 /**
 348  * Update boot epoch when recovery ends
 349  */
 350 void tgt_boot_epoch_update(struct lu_target *tgt)
 351 {
 352         struct lu_env            env;
 353         struct ptlrpc_request   *req;
 354         __u32                    start_epoch;
 355         struct list_head         client_list;
 356         int                      rc;
 357
 358         if (tgt->lut_obd->obd_stopping)
 359                 return;
 360
 361         rc = lu_env_init(&env, LCT_DT_THREAD);
 362         if (rc) {
 363                 CERROR("%s: can't initialize environment: rc = %d\n",
 364                         tgt->lut_obd->obd_name, rc);
 365                 return;
 366         }
 367
 368         spin_lock(&tgt->lut_translock);
 369         start_epoch = lr_epoch(tgt->lut_last_transno) + 1;
 370         tgt->lut_last_transno = (__u64)start_epoch << LR_EPOCH_BITS;
 371         tgt->lut_lsd.lsd_start_epoch = start_epoch;
 372         spin_unlock(&tgt->lut_translock);
 373
 374         INIT_LIST_HEAD(&client_list);
 375         /**
 376          * The recovery is not yet finished and final queue can still be updated
 377          * with resend requests. Move final list to separate one for processing
 378          */
 379         spin_lock(&tgt->lut_obd->obd_recovery_task_lock);
 380         list_splice_init(&tgt->lut_obd->obd_final_req_queue, &client_list);
 381         spin_unlock(&tgt->lut_obd->obd_recovery_task_lock);
 382
 383         /**
 384          * go through list of exports participated in recovery and
 385          * set new epoch for them
 386          */
 387         list_for_each_entry(req, &client_list, rq_list) {
 388                 LASSERT(!req->rq_export->exp_delayed);
 389                 if (!req->rq_export->exp_vbr_failed)
 390                         tgt_client_epoch_update(&env, req->rq_export);
 391         }
 392         /** return list back at once */
 393         spin_lock(&tgt->lut_obd->obd_recovery_task_lock);
 394         list_splice_init(&client_list, &tgt->lut_obd->obd_final_req_queue);
 395         spin_unlock(&tgt->lut_obd->obd_recovery_task_lock);
 396         /** update server epoch */
 397         tgt_server_data_update(&env, tgt, 1);
 398         lu_env_fini(&env);
 399 }
 400
 401 /**
 402  * commit callback, need to update last_commited value
 403  */
 404 struct tgt_last_committed_callback {
 405         struct dt_txn_commit_cb  llcc_cb;
 406         struct lu_target        *llcc_tgt;
 407         struct obd_export       *llcc_exp;
 408         __u64                    llcc_transno;
 409 };
 410
 411 static void tgt_cb_last_committed(struct lu_env *env, struct thandle *th,
 412                                   struct dt_txn_commit_cb *cb, int err)
 413 {
 414         struct tgt_last_committed_callback *ccb;
 415
 416         ccb = container_of0(cb, struct tgt_last_committed_callback, llcc_cb);
 417
 418         LASSERT(ccb->llcc_tgt != NULL);
 419         LASSERT(ccb->llcc_exp->exp_obd == ccb->llcc_tgt->lut_obd);
 420
 421         spin_lock(&ccb->llcc_tgt->lut_translock);
 422         if (ccb->llcc_transno > ccb->llcc_tgt->lut_obd->obd_last_committed)
 423                 ccb->llcc_tgt->lut_obd->obd_last_committed = ccb->llcc_transno;
 424
 425         LASSERT(ccb->llcc_exp);
 426         if (ccb->llcc_transno > ccb->llcc_exp->exp_last_committed) {
 427                 ccb->llcc_exp->exp_last_committed = ccb->llcc_transno;
 428                 spin_unlock(&ccb->llcc_tgt->lut_translock);
 429                 ptlrpc_commit_replies(ccb->llcc_exp);
 430         } else {
 431                 spin_unlock(&ccb->llcc_tgt->lut_translock);
 432         }
 433         class_export_cb_put(ccb->llcc_exp);
 434         if (ccb->llcc_transno)
 435                 CDEBUG(D_HA, "%s: transno "LPD64" is committed\n",
 436                        ccb->llcc_tgt->lut_obd->obd_name, ccb->llcc_transno);
 437         OBD_FREE_PTR(ccb);
 438 }
 439
 440 int tgt_last_commit_cb_add(struct thandle *th, struct lu_target *tgt,
 441                            struct obd_export *exp, __u64 transno)
 442 {
 443         struct tgt_last_committed_callback      *ccb;
 444         struct dt_txn_commit_cb                 *dcb;
 445         int                                      rc;
 446
 447         OBD_ALLOC_PTR(ccb);
 448         if (ccb == NULL)
 449                 return -ENOMEM;
 450
 451         ccb->llcc_tgt = tgt;
 452         ccb->llcc_exp = class_export_cb_get(exp);
 453         ccb->llcc_transno = transno;
 454
 455         dcb = &ccb->llcc_cb;
 456         dcb->dcb_func = tgt_cb_last_committed;
 457         INIT_LIST_HEAD(&dcb->dcb_linkage);
 458         strlcpy(dcb->dcb_name, "tgt_cb_last_committed", sizeof(dcb->dcb_name));
 459
 460         rc = dt_trans_cb_add(th, dcb);
 461         if (rc) {
 462                 class_export_cb_put(exp);
 463                 OBD_FREE_PTR(ccb);
 464         }
 465
 466         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 467                 /* report failure to force synchronous operation */
 468                 return -EPERM;
 469
 470         return rc;
 471 }
 472
 473 struct tgt_new_client_callback {
 474         struct dt_txn_commit_cb  lncc_cb;
 475         struct obd_export       *lncc_exp;
 476 };
 477
 478 static void tgt_cb_new_client(struct lu_env *env, struct thandle *th,
 479                               struct dt_txn_commit_cb *cb, int err)
 480 {
 481         struct tgt_new_client_callback *ccb;
 482
 483         ccb = container_of0(cb, struct tgt_new_client_callback, lncc_cb);
 484
 485         LASSERT(ccb->lncc_exp->exp_obd);
 486
 487         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 488                ccb->lncc_exp->exp_obd->obd_name,
 489                ccb->lncc_exp->exp_client_uuid.uuid);
 490
 491         spin_lock(&ccb->lncc_exp->exp_lock);
 492         /* XXX: Currently, we use per-export based sync/async policy for
 493          *      the update via OUT RPC, it is coarse-grained policy, and
 494          *      will be changed as per-request based by DNE II patches. */
 495         if (!ccb->lncc_exp->exp_keep_sync)
 496                 ccb->lncc_exp->exp_need_sync = 0;
 497
 498         spin_unlock(&ccb->lncc_exp->exp_lock);
 499         class_export_cb_put(ccb->lncc_exp);
 500
 501         OBD_FREE_PTR(ccb);
 502 }
 503
 504 int tgt_new_client_cb_add(struct thandle *th, struct obd_export *exp)
 505 {
 506         struct tgt_new_client_callback  *ccb;
 507         struct dt_txn_commit_cb         *dcb;
 508         int                              rc;
 509
 510         OBD_ALLOC_PTR(ccb);
 511         if (ccb == NULL)
 512                 return -ENOMEM;
 513
 514         ccb->lncc_exp = class_export_cb_get(exp);
 515
 516         dcb = &ccb->lncc_cb;
 517         dcb->dcb_func = tgt_cb_new_client;
 518         INIT_LIST_HEAD(&dcb->dcb_linkage);
 519         strlcpy(dcb->dcb_name, "tgt_cb_new_client", sizeof(dcb->dcb_name));
 520
 521         rc = dt_trans_cb_add(th, dcb);
 522         if (rc) {
 523                 class_export_cb_put(exp);
 524                 OBD_FREE_PTR(ccb);
 525         }
 526         return rc;
 527 }
 528
 529 /**
 530  * Add new client to the last_rcvd upon new connection.
 531  *
 532  * We use a bitmap to locate a free space in the last_rcvd file and initialize
 533  * tg_export_data.
 534  */
 535 int tgt_client_new(const struct lu_env *env, struct obd_export *exp)
 536 {
 537         struct tg_export_data   *ted = &exp->exp_target_data;
 538         struct lu_target        *tgt = class_exp2tgt(exp);
 539         int                      rc = 0, idx;
 540
 541         ENTRY;
 542
 543         LASSERT(tgt && tgt->lut_client_bitmap != NULL);
 544         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid))
 545                 RETURN(0);
 546
 547         mutex_init(&ted->ted_lcd_lock);
 548
 549         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 550                 RETURN(0);
 551
 552         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 553          * there's no need for extra complication here
 554          */
 555         idx = find_first_zero_bit(tgt->lut_client_bitmap, LR_MAX_CLIENTS);
 556 repeat:
 557         if (idx >= LR_MAX_CLIENTS ||
 558             OBD_FAIL_CHECK(OBD_FAIL_MDS_CLIENT_ADD)) {
 559                 CERROR("%s: no room for %u clients - fix LR_MAX_CLIENTS\n",
 560                        tgt->lut_obd->obd_name,  idx);
 561                 RETURN(-EOVERFLOW);
 562         }
 563         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 564                 idx = find_next_zero_bit(tgt->lut_client_bitmap,
 565                                              LR_MAX_CLIENTS, idx);
 566                 goto repeat;
 567         }
 568
 569         CDEBUG(D_INFO, "%s: client at idx %d with UUID '%s' added\n",
 570                tgt->lut_obd->obd_name, idx, ted->ted_lcd->lcd_uuid);
 571
 572         ted->ted_lr_idx = idx;
 573         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
 574                           idx * tgt->lut_lsd.lsd_client_size;
 575
 576         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 577
 578         CDEBUG(D_INFO, "%s: new client at index %d (%llu) with UUID '%s'\n",
 579                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
 580                ted->ted_lcd->lcd_uuid);
 581
 582         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_CLIENT_ADD))
 583                 RETURN(-ENOSPC);
 584
 585         rc = tgt_client_data_update(env, exp);
 586         if (rc)
 587                 CERROR("%s: Failed to write client lcd at idx %d, rc %d\n",
 588                        tgt->lut_obd->obd_name, idx, rc);
 589
 590         RETURN(rc);
 591 }
 592 EXPORT_SYMBOL(tgt_client_new);
 593
 594 /* Add client data to the MDS.  We use a bitmap to locate a free space
 595  * in the last_rcvd file if cl_off is -1 (i.e. a new client).
 596  * Otherwise, we just have to read the data from the last_rcvd file and
 597  * we know its offset.
 598  *
 599  * It should not be possible to fail adding an existing client - otherwise
 600  * mdt_init_server_data() callsite needs to be fixed.
 601  */
 602 int tgt_client_add(const struct lu_env *env,  struct obd_export *exp, int idx)
 603 {
 604         struct tg_export_data   *ted = &exp->exp_target_data;
 605         struct lu_target        *tgt = class_exp2tgt(exp);
 606
 607         ENTRY;
 608
 609         LASSERT(tgt && tgt->lut_client_bitmap != NULL);
 610         LASSERTF(idx >= 0, "%d\n", idx);
 611
 612         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid) ||
 613             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 614                 RETURN(0);
 615
 616         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 617                 CERROR("%s: client %d: bit already set in bitmap!!\n",
 618                        tgt->lut_obd->obd_name,  idx);
 619                 LBUG();
 620         }
 621
 622         CDEBUG(D_INFO, "%s: client at idx %d with UUID '%s' added\n",
 623                tgt->lut_obd->obd_name, idx, ted->ted_lcd->lcd_uuid);
 624
 625         ted->ted_lr_idx = idx;
 626         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
 627                           idx * tgt->lut_lsd.lsd_client_size;
 628
 629         mutex_init(&ted->ted_lcd_lock);
 630
 631         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 632
 633         RETURN(0);
 634 }
 635
 636 int tgt_client_del(const struct lu_env *env, struct obd_export *exp)
 637 {
 638         struct tg_export_data   *ted = &exp->exp_target_data;
 639         struct lu_target        *tgt = class_exp2tgt(exp);
 640         int                      rc;
 641
 642         ENTRY;
 643
 644         LASSERT(ted->ted_lcd);
 645
 646         if (unlikely(tgt == NULL)) {
 647                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
 648                        class_exp2obd(exp)->obd_name);
 649                 RETURN(-EINVAL);
 650         }
 651
 652         /* XXX if lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 653         if (!strcmp((char *)ted->ted_lcd->lcd_uuid,
 654                     (char *)tgt->lut_obd->obd_uuid.uuid) ||
 655             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 656                 RETURN(0);
 657
 658         CDEBUG(D_INFO, "%s: del client at idx %u, off %lld, UUID '%s'\n",
 659                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
 660                ted->ted_lcd->lcd_uuid);
 661
 662         /* Clear the bit _after_ zeroing out the client so we don't
 663            race with filter_client_add and zero out new clients.*/
 664         if (!test_bit(ted->ted_lr_idx, tgt->lut_client_bitmap)) {
 665                 CERROR("%s: client %u: bit already clear in bitmap!!\n",
 666                        tgt->lut_obd->obd_name, ted->ted_lr_idx);
 667                 LBUG();
 668         }
 669
 670         /* Do not erase record for recoverable client. */
 671         if (exp->exp_flags & OBD_OPT_FAILOVER)
 672                 RETURN(0);
 673
 674         /* Make sure the server's last_transno is up to date.
 675          * This should be done before zeroing client slot so last_transno will
 676          * be in server data or in client data in case of failure */
 677         rc = tgt_server_data_update(env, tgt, 0);
 678         if (rc != 0) {
 679                 CERROR("%s: failed to update server data, skip client %s "
 680                        "zeroing, rc %d\n", tgt->lut_obd->obd_name,
 681                        ted->ted_lcd->lcd_uuid, rc);
 682                 RETURN(rc);
 683         }
 684
 685         mutex_lock(&ted->ted_lcd_lock);
 686         memset(ted->ted_lcd->lcd_uuid, 0, sizeof ted->ted_lcd->lcd_uuid);
 687         rc = tgt_client_data_update(env, exp);
 688         mutex_unlock(&ted->ted_lcd_lock);
 689
 690         CDEBUG(rc == 0 ? D_INFO : D_ERROR,
 691                "%s: zeroing out client %s at idx %u (%llu), rc %d\n",
 692                tgt->lut_obd->obd_name, ted->ted_lcd->lcd_uuid,
 693                ted->ted_lr_idx, ted->ted_lr_off, rc);
 694         RETURN(rc);
 695 }
 696 EXPORT_SYMBOL(tgt_client_del);
 697
 698 /*
 699  * last_rcvd & last_committed update callbacks
 700  */
 701 static int tgt_last_rcvd_update(const struct lu_env *env, struct lu_target *tgt,
 702                                 struct dt_object *obj, __u64 opdata,
 703                                 struct thandle *th, struct ptlrpc_request *req)
 704 {
 705         struct tgt_thread_info  *tti = tgt_th_info(env);
 706         struct tg_export_data   *ted;
 707         __u64                   *transno_p;
 708         int                      rc = 0;
 709         bool                     lw_client, update = false;
 710
 711         ENTRY;
 712
 713         ted = &req->rq_export->exp_target_data;
 714
 715         lw_client = exp_connect_flags(req->rq_export) & OBD_CONNECT_LIGHTWEIGHT;
 716         if (ted->ted_lr_idx < 0 && !lw_client)
 717                 /* ofd connect may cause transaction before export has
 718                  * last_rcvd slot */
 719                 RETURN(0);
 720
 721         tti->tti_transno = lustre_msg_get_transno(req->rq_reqmsg);
 722
 723         spin_lock(&tgt->lut_translock);
 724         if (th->th_result != 0) {
 725                 if (tti->tti_transno != 0) {
 726                         CERROR("%s: replay transno "LPU64" failed: rc = %d\n",
 727                                tgt_name(tgt), tti->tti_transno, th->th_result);
 728                 }
 729         } else if (tti->tti_transno == 0) {
 730                 tti->tti_transno = ++tgt->lut_last_transno;
 731         } else {
 732                 /* should be replay */
 733                 if (tti->tti_transno > tgt->lut_last_transno)
 734                         tgt->lut_last_transno = tti->tti_transno;
 735         }
 736         spin_unlock(&tgt->lut_translock);
 737
 738         /** VBR: set new versions */
 739         if (th->th_result == 0 && obj != NULL)
 740                 dt_version_set(env, obj, tti->tti_transno, th);
 741
 742         /* filling reply data */
 743         CDEBUG(D_INODE, "transno = "LPU64", last_committed = "LPU64"\n",
 744                tti->tti_transno, tgt->lut_obd->obd_last_committed);
 745
 746         req->rq_transno = tti->tti_transno;
 747         lustre_msg_set_transno(req->rq_repmsg, tti->tti_transno);
 748
 749         /* if can't add callback, do sync write */
 750         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, req->rq_export,
 751                                                 tti->tti_transno);
 752
 753         if (lw_client) {
 754                 /* All operations performed by LW clients are synchronous and
 755                  * we store the committed transno in the last_rcvd header */
 756                 spin_lock(&tgt->lut_translock);
 757                 if (tti->tti_transno > tgt->lut_lsd.lsd_last_transno) {
 758                         tgt->lut_lsd.lsd_last_transno = tti->tti_transno;
 759                         update = true;
 760                 }
 761                 spin_unlock(&tgt->lut_translock);
 762                 /* Although lightweight (LW) connections have no slot in
 763                  * last_rcvd, we still want to maintain the in-memory
 764                  * lsd_client_data structure in order to properly handle reply
 765                  * reconstruction. */
 766         } else if (ted->ted_lr_off == 0) {
 767                 CERROR("%s: client idx %d has offset %lld\n",
 768                        tgt_name(tgt), ted->ted_lr_idx, ted->ted_lr_off);
 769                 RETURN(-EINVAL);
 770         }
 771
 772         /* if the export has already been disconnected, we have no last_rcvd
 773          * slot, update server data with latest transno then */
 774         if (ted->ted_lcd == NULL) {
 775                 CWARN("commit transaction for disconnected client %s: rc %d\n",
 776                       req->rq_export->exp_client_uuid.uuid, rc);
 777                 GOTO(srv_update, rc = 0);
 778         }
 779
 780         mutex_lock(&ted->ted_lcd_lock);
 781         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
 782         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE) {
 783                 transno_p = &ted->ted_lcd->lcd_last_close_transno;
 784                 ted->ted_lcd->lcd_last_close_xid = req->rq_xid;
 785                 ted->ted_lcd->lcd_last_close_result = th->th_result;
 786         } else {
 787                 /* VBR: save versions in last_rcvd for reconstruct. */
 788                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
 789
 790                 if (pre_versions) {
 791                         ted->ted_lcd->lcd_pre_versions[0] = pre_versions[0];
 792                         ted->ted_lcd->lcd_pre_versions[1] = pre_versions[1];
 793                         ted->ted_lcd->lcd_pre_versions[2] = pre_versions[2];
 794                         ted->ted_lcd->lcd_pre_versions[3] = pre_versions[3];
 795                 }
 796                 transno_p = &ted->ted_lcd->lcd_last_transno;
 797                 ted->ted_lcd->lcd_last_xid = req->rq_xid;
 798                 ted->ted_lcd->lcd_last_result = th->th_result;
 799                 /* XXX: lcd_last_data is __u32 but intent_dispostion is __u64,
 800                  * see struct ldlm_reply->lock_policy_res1; */
 801                 ted->ted_lcd->lcd_last_data = opdata;
 802         }
 803
 804         /* Update transno in slot only if non-zero number, i.e. no errors */
 805         if (likely(tti->tti_transno != 0)) {
 806                 if (*transno_p > tti->tti_transno &&
 807                     !tgt->lut_no_reconstruct) {
 808                         CERROR("%s: trying to overwrite bigger transno:"
 809                                "on-disk: "LPU64", new: "LPU64" replay: %d. "
 810                                "see LU-617.\n", tgt_name(tgt), *transno_p,
 811                                tti->tti_transno, req_is_replay(req));
 812                         if (req_is_replay(req)) {
 813                                 spin_lock(&req->rq_export->exp_lock);
 814                                 req->rq_export->exp_vbr_failed = 1;
 815                                 spin_unlock(&req->rq_export->exp_lock);
 816                         }
 817                         mutex_unlock(&ted->ted_lcd_lock);
 818                         RETURN(req_is_replay(req) ? -EOVERFLOW : 0);
 819                 }
 820                 *transno_p = tti->tti_transno;
 821         }
 822
 823         if (!lw_client) {
 824                 tti->tti_off = ted->ted_lr_off;
 825                 rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 826                 if (rc < 0) {
 827                         mutex_unlock(&ted->ted_lcd_lock);
 828                         RETURN(rc);
 829                 }
 830         }
 831         mutex_unlock(&ted->ted_lcd_lock);
 832         EXIT;
 833 srv_update:
 834         if (update)
 835                 rc = tgt_server_data_write(env, tgt, th);
 836         return rc;
 837 }
 838
 839 /*
 840  * last_rcvd update for echo client simulation.
 841  * It updates last_rcvd client slot and version of object in
 842  * simple way but with all locks to simulate all drawbacks
 843  */
 844 static int tgt_last_rcvd_update_echo(const struct lu_env *env,
 845                                      struct lu_target *tgt,
 846                                      struct dt_object *obj,
 847                                      struct thandle *th,
 848                                      struct obd_export *exp)
 849 {
 850         struct tgt_thread_info  *tti = tgt_th_info(env);
 851         struct tg_export_data   *ted = &exp->exp_target_data;
 852         int                      rc = 0;
 853
 854         ENTRY;
 855
 856         tti->tti_transno = 0;
 857
 858         spin_lock(&tgt->lut_translock);
 859         if (th->th_result == 0)
 860                 tti->tti_transno = ++tgt->lut_last_transno;
 861         spin_unlock(&tgt->lut_translock);
 862
 863         /** VBR: set new versions */
 864         if (th->th_result == 0 && obj != NULL)
 865                 dt_version_set(env, obj, tti->tti_transno, th);
 866
 867         /* if can't add callback, do sync write */
 868         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, exp,
 869                                                 tti->tti_transno);
 870
 871         LASSERT(ted->ted_lr_off > 0);
 872
 873         mutex_lock(&ted->ted_lcd_lock);
 874         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
 875         ted->ted_lcd->lcd_last_transno = tti->tti_transno;
 876         ted->ted_lcd->lcd_last_result = th->th_result;
 877
 878         tti->tti_off = ted->ted_lr_off;
 879         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 880         mutex_unlock(&ted->ted_lcd_lock);
 881         RETURN(rc);
 882 }
 883
 884 static int tgt_clients_data_init(const struct lu_env *env,
 885                                  struct lu_target *tgt,
 886                                  unsigned long last_size)
 887 {
 888         struct obd_device       *obd = tgt->lut_obd;
 889         struct lr_server_data   *lsd = &tgt->lut_lsd;
 890         struct lsd_client_data  *lcd = NULL;
 891         struct tg_export_data   *ted;
 892         int                      cl_idx;
 893         int                      rc = 0;
 894         loff_t                   off = lsd->lsd_client_start;
 895
 896         ENTRY;
 897
 898         CLASSERT(offsetof(struct lsd_client_data, lcd_padding) +
 899                  sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
 900
 901         OBD_ALLOC_PTR(lcd);
 902         if (lcd == NULL)
 903                 RETURN(-ENOMEM);
 904
 905         for (cl_idx = 0; off < last_size; cl_idx++) {
 906                 struct obd_export       *exp;
 907                 __u64                    last_transno;
 908
 909                 /* Don't assume off is incremented properly by
 910                  * read_record(), in case sizeof(*lcd)
 911                  * isn't the same as fsd->lsd_client_size.  */
 912                 off = lsd->lsd_client_start + cl_idx * lsd->lsd_client_size;
 913                 rc = tgt_client_data_read(env, tgt, lcd, &off, cl_idx);
 914                 if (rc) {
 915                         CERROR("%s: error reading last_rcvd %s idx %d off "
 916                                "%llu: rc = %d\n", tgt_name(tgt), LAST_RCVD,
 917                                cl_idx, off, rc);
 918                         rc = 0;
 919                         break; /* read error shouldn't cause startup to fail */
 920                 }
 921
 922                 if (lcd->lcd_uuid[0] == '\0') {
 923                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
 924                                cl_idx);
 925                         continue;
 926                 }
 927
 928                 last_transno = lcd_last_transno(lcd);
 929
 930                 /* These exports are cleaned up by disconnect, so they
 931                  * need to be set up like real exports as connect does.
 932                  */
 933                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
 934                        " srv lr: "LPU64" lx: "LPU64"\n", lcd->lcd_uuid, cl_idx,
 935                        last_transno, lsd->lsd_last_transno, lcd_last_xid(lcd));
 936
 937                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
 938                 if (IS_ERR(exp)) {
 939                         if (PTR_ERR(exp) == -EALREADY) {
 940                                 /* export already exists, zero out this one */
 941                                 CERROR("%s: Duplicate export %s!\n",
 942                                        tgt_name(tgt), lcd->lcd_uuid);
 943                                 continue;
 944                         }
 945                         GOTO(err_out, rc = PTR_ERR(exp));
 946                 }
 947
 948                 ted = &exp->exp_target_data;
 949                 *ted->ted_lcd = *lcd;
 950
 951                 rc = tgt_client_add(env, exp, cl_idx);
 952                 LASSERTF(rc == 0, "rc = %d\n", rc); /* can't fail existing */
 953                 /* VBR: set export last committed version */
 954                 exp->exp_last_committed = last_transno;
 955                 spin_lock(&exp->exp_lock);
 956                 exp->exp_connecting = 0;
 957                 exp->exp_in_recovery = 0;
 958                 spin_unlock(&exp->exp_lock);
 959                 obd->obd_max_recoverable_clients++;
 960                 class_export_put(exp);
 961
 962                 /* Need to check last_rcvd even for duplicated exports. */
 963                 CDEBUG(D_OTHER, "client at idx %d has last_transno = "LPU64"\n",
 964                        cl_idx, last_transno);
 965
 966                 spin_lock(&tgt->lut_translock);
 967                 tgt->lut_last_transno = max(last_transno,
 968                                             tgt->lut_last_transno);
 969                 spin_unlock(&tgt->lut_translock);
 970         }
 971
 972 err_out:
 973         OBD_FREE_PTR(lcd);
 974         RETURN(rc);
 975 }
 976
 977 struct server_compat_data {
 978         __u32 rocompat;
 979         __u32 incompat;
 980         __u32 rocinit;
 981         __u32 incinit;
 982 };
 983
 984 static struct server_compat_data tgt_scd[] = {
 985         [LDD_F_SV_TYPE_MDT] = {
 986                 .rocompat = OBD_ROCOMPAT_LOVOBJID,
 987                 .incompat = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
 988                             OBD_INCOMPAT_FID | OBD_INCOMPAT_IAM_DIR |
 989                             OBD_INCOMPAT_LMM_VER | OBD_INCOMPAT_MULTI_OI,
 990                 .rocinit = OBD_ROCOMPAT_LOVOBJID,
 991                 .incinit = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
 992                            OBD_INCOMPAT_MULTI_OI,
 993         },
 994         [LDD_F_SV_TYPE_OST] = {
 995                 .rocompat = OBD_ROCOMPAT_IDX_IN_IDIF,
 996                 .incompat = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR |
 997                             OBD_INCOMPAT_FID,
 998                 .rocinit = OBD_ROCOMPAT_IDX_IN_IDIF,
 999                 .incinit = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR,
1000         }
1001 };
1002
1003 int tgt_server_data_init(const struct lu_env *env, struct lu_target *tgt)
1004 {
1005         struct tgt_thread_info          *tti = tgt_th_info(env);
1006         struct lr_server_data           *lsd = &tgt->lut_lsd;
1007         unsigned long                    last_rcvd_size;
1008         __u32                            index;
1009         int                              rc, type;
1010
1011         rc = dt_attr_get(env, tgt->lut_last_rcvd, &tti->tti_attr);
1012         if (rc)
1013                 RETURN(rc);
1014
1015         last_rcvd_size = (unsigned long)tti->tti_attr.la_size;
1016
1017         /* ensure padding in the struct is the correct size */
1018         CLASSERT(offsetof(struct lr_server_data, lsd_padding) +
1019                  sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
1020
1021         rc = server_name2index(tgt_name(tgt), &index, NULL);
1022         if (rc < 0) {
1023                 CERROR("%s: Can not get index from name: rc = %d\n",
1024                        tgt_name(tgt), rc);
1025                 RETURN(rc);
1026         }
1027         /* server_name2index() returns type */
1028         type = rc;
1029         if (type != LDD_F_SV_TYPE_MDT && type != LDD_F_SV_TYPE_OST) {
1030                 CERROR("%s: unknown target type %x\n", tgt_name(tgt), type);
1031                 RETURN(-EINVAL);
1032         }
1033
1034         /* last_rcvd on OST doesn't provide reconstruct support because there
1035          * may be up to 8 in-flight write requests per single slot in
1036          * last_rcvd client data
1037          */
1038         tgt->lut_no_reconstruct = (type == LDD_F_SV_TYPE_OST);
1039
1040         if (last_rcvd_size == 0) {
1041                 LCONSOLE_WARN("%s: new disk, initializing\n", tgt_name(tgt));
1042
1043                 memcpy(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid,
1044                        sizeof(lsd->lsd_uuid));
1045                 lsd->lsd_last_transno = 0;
1046                 lsd->lsd_mount_count = 0;
1047                 lsd->lsd_server_size = LR_SERVER_SIZE;
1048                 lsd->lsd_client_start = LR_CLIENT_START;
1049                 lsd->lsd_client_size = LR_CLIENT_SIZE;
1050                 lsd->lsd_subdir_count = OBJ_SUBDIR_COUNT;
1051                 lsd->lsd_osd_index = index;
1052                 lsd->lsd_feature_rocompat = tgt_scd[type].rocinit;
1053                 lsd->lsd_feature_incompat = tgt_scd[type].incinit;
1054         } else {
1055                 rc = tgt_server_data_read(env, tgt);
1056                 if (rc) {
1057                         CERROR("%s: error reading LAST_RCVD: rc= %d\n",
1058                                tgt_name(tgt), rc);
1059                         RETURN(rc);
1060                 }
1061                 if (strcmp(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid)) {
1062                         LCONSOLE_ERROR_MSG(0x157, "Trying to start OBD %s "
1063                                            "using the wrong disk %s. Were the"
1064                                            " /dev/ assignments rearranged?\n",
1065                                            tgt->lut_obd->obd_uuid.uuid,
1066                                            lsd->lsd_uuid);
1067                         RETURN(-EINVAL);
1068                 }
1069
1070                 if (lsd->lsd_osd_index != index) {
1071                         LCONSOLE_ERROR_MSG(0x157, "%s: index %d in last rcvd "
1072                                            "is different with the index %d in"
1073                                            "config log, It might be disk"
1074                                            "corruption!\n", tgt_name(tgt),
1075                                            lsd->lsd_osd_index, index);
1076                         RETURN(-EINVAL);
1077                 }
1078         }
1079
1080         if (lsd->lsd_feature_incompat & ~tgt_scd[type].incompat) {
1081                 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
1082                        tgt_name(tgt),
1083                        lsd->lsd_feature_incompat & ~tgt_scd[type].incompat);
1084                 RETURN(-EINVAL);
1085         }
1086
1087         if (type == LDD_F_SV_TYPE_MDT)
1088                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
1089
1090         if (lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat) {
1091                 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
1092                        tgt_name(tgt),
1093                        lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat);
1094                 RETURN(-EINVAL);
1095         }
1096         /** Interop: evict all clients at first boot with 1.8 last_rcvd */
1097         if (type == LDD_F_SV_TYPE_MDT &&
1098             !(lsd->lsd_feature_compat & OBD_COMPAT_20)) {
1099                 if (last_rcvd_size > lsd->lsd_client_start) {
1100                         LCONSOLE_WARN("%s: mounting at first time on 1.8 FS, "
1101                                       "remove all clients for interop needs\n",
1102                                       tgt_name(tgt));
1103                         rc = tgt_truncate_last_rcvd(env, tgt,
1104                                                     lsd->lsd_client_start);
1105                         if (rc)
1106                                 RETURN(rc);
1107                         last_rcvd_size = lsd->lsd_client_start;
1108                 }
1109                 /** set 2.0 flag to upgrade/downgrade between 1.8 and 2.0 */
1110                 lsd->lsd_feature_compat |= OBD_COMPAT_20;
1111         }
1112
1113         spin_lock(&tgt->lut_translock);
1114         tgt->lut_last_transno = lsd->lsd_last_transno;
1115         spin_unlock(&tgt->lut_translock);
1116
1117         lsd->lsd_mount_count++;
1118
1119         CDEBUG(D_INODE, "=======,=BEGIN DUMPING LAST_RCVD========\n");
1120         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
1121                tgt_name(tgt), tgt->lut_last_transno);
1122         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
1123                tgt_name(tgt), lsd->lsd_mount_count);
1124         CDEBUG(D_INODE, "%s: server data size: %u\n",
1125                tgt_name(tgt), lsd->lsd_server_size);
1126         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
1127                tgt_name(tgt), lsd->lsd_client_start);
1128         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
1129                tgt_name(tgt), lsd->lsd_client_size);
1130         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
1131                tgt_name(tgt), last_rcvd_size);
1132         CDEBUG(D_INODE, "%s: server subdir_count: %u\n",
1133                tgt_name(tgt), lsd->lsd_subdir_count);
1134         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", tgt_name(tgt),
1135                last_rcvd_size <= lsd->lsd_client_start ? 0 :
1136                (last_rcvd_size - lsd->lsd_client_start) /
1137                 lsd->lsd_client_size);
1138         CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
1139
1140         if (lsd->lsd_server_size == 0 || lsd->lsd_client_start == 0 ||
1141             lsd->lsd_client_size == 0) {
1142                 CERROR("%s: bad last_rcvd contents!\n", tgt_name(tgt));
1143                 RETURN(-EINVAL);
1144         }
1145
1146         if (!tgt->lut_obd->obd_replayable)
1147                 CWARN("%s: recovery support OFF\n", tgt_name(tgt));
1148
1149         rc = tgt_clients_data_init(env, tgt, last_rcvd_size);
1150         if (rc < 0)
1151                 GOTO(err_client, rc);
1152
1153         spin_lock(&tgt->lut_translock);
1154         /* obd_last_committed is used for compatibility
1155          * with other lustre recovery code */
1156         tgt->lut_obd->obd_last_committed = tgt->lut_last_transno;
1157         spin_unlock(&tgt->lut_translock);
1158
1159         tgt->lut_obd->u.obt.obt_mount_count = lsd->lsd_mount_count;
1160         tgt->lut_obd->u.obt.obt_instance = (__u32)lsd->lsd_mount_count;
1161
1162         /* save it, so mount count and last_transno is current */
1163         rc = tgt_server_data_update(env, tgt, 0);
1164         if (rc < 0)
1165                 GOTO(err_client, rc);
1166
1167         RETURN(0);
1168
1169 err_client:
1170         class_disconnect_exports(tgt->lut_obd);
1171         return rc;
1172 }
1173
1174 /* add credits for last_rcvd update */
1175 int tgt_txn_start_cb(const struct lu_env *env, struct thandle *th,
1176                      void *cookie)
1177 {
1178         struct lu_target        *tgt = cookie;
1179         struct tgt_session_info *tsi;
1180         struct tgt_thread_info  *tti = tgt_th_info(env);
1181         int                      rc;
1182
1183         /* if there is no session, then this transaction is not result of
1184          * request processing but some local operation */
1185         if (env->le_ses == NULL)
1186                 return 0;
1187
1188         LASSERT(tgt->lut_last_rcvd);
1189         tsi = tgt_ses_info(env);
1190         /* OFD may start transaction without export assigned */
1191         if (tsi->tsi_exp == NULL)
1192                 return 0;
1193
1194         tti_buf_lcd(tti);
1195         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
1196                                      &tti->tti_buf,
1197                                      tsi->tsi_exp->exp_target_data.ted_lr_off,
1198                                      th);
1199         if (rc)
1200                 return rc;
1201
1202         tti_buf_lsd(tti);
1203         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
1204                                      &tti->tti_buf, 0, th);
1205         if (rc)
1206                 return rc;
1207
1208         if (tsi->tsi_vbr_obj != NULL &&
1209             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu))
1210                 rc = dt_declare_version_set(env, tsi->tsi_vbr_obj, th);
1211
1212         return rc;
1213 }
1214
1215 /* Update last_rcvd records with latests transaction data */
1216 int tgt_txn_stop_cb(const struct lu_env *env, struct thandle *th,
1217                     void *cookie)
1218 {
1219         struct lu_target        *tgt = cookie;
1220         struct tgt_session_info *tsi;
1221         struct tgt_thread_info  *tti = tgt_th_info(env);
1222         struct dt_object        *obj = NULL;
1223         int                      rc;
1224         bool                     echo_client;
1225
1226         if (env->le_ses == NULL)
1227                 return 0;
1228
1229         tsi = tgt_ses_info(env);
1230         /* OFD may start transaction without export assigned */
1231         if (tsi->tsi_exp == NULL)
1232                 return 0;
1233
1234         echo_client = (tgt_ses_req(tsi) == NULL);
1235
1236         if (tti->tti_has_trans && !echo_client) {
1237                 if (tti->tti_mult_trans == 0) {
1238                         CDEBUG(D_HA, "More than one transaction "LPU64"\n",
1239                                tti->tti_transno);
1240                         RETURN(0);
1241                 }
1242                 /* we need another transno to be assigned */
1243                 tti->tti_transno = 0;
1244         } else if (th->th_result == 0) {
1245                 tti->tti_has_trans = 1;
1246         }
1247
1248         if (tsi->tsi_vbr_obj != NULL &&
1249             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu)) {
1250                 obj = tsi->tsi_vbr_obj;
1251         }
1252
1253         if (unlikely(echo_client)) /* echo client special case */
1254                 rc = tgt_last_rcvd_update_echo(env, tgt, obj, th,
1255                                                tsi->tsi_exp);
1256         else
1257                 rc = tgt_last_rcvd_update(env, tgt, obj, tsi->tsi_opdata, th,
1258                                           tgt_ses_req(tsi));
1259         return rc;
1260 }