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 EXPORT_SYMBOL(tgt_client_data_read);
 131
 132 int tgt_client_data_write(const struct lu_env *env, struct lu_target *tgt,
 133                           struct lsd_client_data *lcd, loff_t *off,
 134                           struct thandle *th)
 135 {
 136         struct tgt_thread_info *tti = tgt_th_info(env);
 137
 138         lcd->lcd_last_result = ptlrpc_status_hton(lcd->lcd_last_result);
 139         lcd->lcd_last_close_result =
 140                 ptlrpc_status_hton(lcd->lcd_last_close_result);
 141         lcd_cpu_to_le(lcd, &tti->tti_lcd);
 142         tti_buf_lcd(tti);
 143
 144         return dt_record_write(env, tgt->lut_last_rcvd, &tti->tti_buf, off, th);
 145 }
 146 EXPORT_SYMBOL(tgt_client_data_write);
 147
 148 /**
 149  * Update client data in last_rcvd
 150  */
 151 static int tgt_client_data_update(const struct lu_env *env,
 152                                   struct obd_export *exp)
 153 {
 154         struct tg_export_data   *ted = &exp->exp_target_data;
 155         struct lu_target        *tgt = class_exp2tgt(exp);
 156         struct tgt_thread_info  *tti = tgt_th_info(env);
 157         struct thandle          *th;
 158         int                      rc = 0;
 159
 160         ENTRY;
 161
 162         th = dt_trans_create(env, tgt->lut_bottom);
 163         if (IS_ERR(th))
 164                 RETURN(PTR_ERR(th));
 165
 166         tti_buf_lcd(tti);
 167         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
 168                                      &tti->tti_buf,
 169                                      ted->ted_lr_off, th);
 170         if (rc)
 171                 GOTO(out, rc);
 172
 173         rc = dt_trans_start_local(env, tgt->lut_bottom, th);
 174         if (rc)
 175                 GOTO(out, rc);
 176         /*
 177          * Until this operations will be committed the sync is needed
 178          * for this export. This should be done _after_ starting the
 179          * transaction so that many connecting clients will not bring
 180          * server down with lots of sync writes.
 181          */
 182         rc = tgt_new_client_cb_add(th, exp);
 183         if (rc) {
 184                 /* can't add callback, do sync now */
 185                 th->th_sync = 1;
 186         } else {
 187                 spin_lock(&exp->exp_lock);
 188                 exp->exp_need_sync = 1;
 189                 spin_unlock(&exp->exp_lock);
 190         }
 191
 192         tti->tti_off = ted->ted_lr_off;
 193         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 194         EXIT;
 195 out:
 196         dt_trans_stop(env, tgt->lut_bottom, th);
 197         CDEBUG(D_INFO, "%s: update last_rcvd client data for UUID = %s, "
 198                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 199                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 200
 201         return rc;
 202 }
 203
 204 int tgt_server_data_read(const struct lu_env *env, struct lu_target *tgt)
 205 {
 206         struct tgt_thread_info  *tti = tgt_th_info(env);
 207         int                      rc;
 208
 209         tti->tti_off = 0;
 210         tti_buf_lsd(tti);
 211         rc = dt_record_read(env, tgt->lut_last_rcvd, &tti->tti_buf,
 212                             &tti->tti_off);
 213         if (rc == 0)
 214                 lsd_le_to_cpu(&tti->tti_lsd, &tgt->lut_lsd);
 215
 216         CDEBUG(D_INFO, "%s: read last_rcvd server data for UUID = %s, "
 217                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 218                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 219         return rc;
 220 }
 221 EXPORT_SYMBOL(tgt_server_data_read);
 222
 223 int tgt_server_data_write(const struct lu_env *env, struct lu_target *tgt,
 224                           struct thandle *th)
 225 {
 226         struct tgt_thread_info  *tti = tgt_th_info(env);
 227         int                      rc;
 228
 229         ENTRY;
 230
 231         tti->tti_off = 0;
 232         tti_buf_lsd(tti);
 233         lsd_cpu_to_le(&tgt->lut_lsd, &tti->tti_lsd);
 234
 235         rc = dt_record_write(env, tgt->lut_last_rcvd, &tti->tti_buf,
 236                              &tti->tti_off, th);
 237
 238         CDEBUG(D_INFO, "%s: write last_rcvd server data for UUID = %s, "
 239                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 240                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 241
 242         RETURN(rc);
 243 }
 244 EXPORT_SYMBOL(tgt_server_data_write);
 245
 246 /**
 247  * Update server data in last_rcvd
 248  */
 249 int tgt_server_data_update(const struct lu_env *env, struct lu_target *tgt,
 250                            int sync)
 251 {
 252         struct tgt_thread_info  *tti = tgt_th_info(env);
 253         struct thandle          *th;
 254         int                      rc = 0;
 255
 256         ENTRY;
 257
 258         CDEBUG(D_SUPER,
 259                "%s: mount_count is "LPU64", last_transno is "LPU64"\n",
 260                tgt->lut_lsd.lsd_uuid, tgt->lut_obd->u.obt.obt_mount_count,
 261                tgt->lut_last_transno);
 262
 263         /* Always save latest transno to keep it fresh */
 264         spin_lock(&tgt->lut_translock);
 265         tgt->lut_lsd.lsd_last_transno = tgt->lut_last_transno;
 266         spin_unlock(&tgt->lut_translock);
 267
 268         th = dt_trans_create(env, tgt->lut_bottom);
 269         if (IS_ERR(th))
 270                 RETURN(PTR_ERR(th));
 271
 272         th->th_sync = sync;
 273
 274         tti_buf_lsd(tti);
 275         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
 276                                      &tti->tti_buf, tti->tti_off, th);
 277         if (rc)
 278                 GOTO(out, rc);
 279
 280         rc = dt_trans_start(env, tgt->lut_bottom, th);
 281         if (rc)
 282                 GOTO(out, rc);
 283
 284         rc = tgt_server_data_write(env, tgt, th);
 285 out:
 286         dt_trans_stop(env, tgt->lut_bottom, th);
 287
 288         CDEBUG(D_INFO, "%s: update last_rcvd server data for UUID = %s, "
 289                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 290                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 291         RETURN(rc);
 292 }
 293 EXPORT_SYMBOL(tgt_server_data_update);
 294
 295 int tgt_truncate_last_rcvd(const struct lu_env *env, struct lu_target *tgt,
 296                            loff_t size)
 297 {
 298         struct dt_object *dt = tgt->lut_last_rcvd;
 299         struct thandle   *th;
 300         struct lu_attr    attr;
 301         int               rc;
 302
 303         ENTRY;
 304
 305         attr.la_size = size;
 306         attr.la_valid = LA_SIZE;
 307
 308         th = dt_trans_create(env, tgt->lut_bottom);
 309         if (IS_ERR(th))
 310                 RETURN(PTR_ERR(th));
 311         rc = dt_declare_punch(env, dt, size, OBD_OBJECT_EOF, th);
 312         if (rc)
 313                 GOTO(cleanup, rc);
 314         rc = dt_declare_attr_set(env, dt, &attr, th);
 315         if (rc)
 316                 GOTO(cleanup, rc);
 317         rc = dt_trans_start_local(env, tgt->lut_bottom, th);
 318         if (rc)
 319                 GOTO(cleanup, rc);
 320
 321         rc = dt_punch(env, dt, size, OBD_OBJECT_EOF, th, BYPASS_CAPA);
 322         if (rc == 0)
 323                 rc = dt_attr_set(env, dt, &attr, th, BYPASS_CAPA);
 324
 325 cleanup:
 326         dt_trans_stop(env, tgt->lut_bottom, th);
 327
 328         RETURN(rc);
 329 }
 330 EXPORT_SYMBOL(tgt_truncate_last_rcvd);
 331
 332 static void tgt_client_epoch_update(const struct lu_env *env,
 333                                     struct obd_export *exp)
 334 {
 335         struct lsd_client_data  *lcd = exp->exp_target_data.ted_lcd;
 336         struct lu_target        *tgt = class_exp2tgt(exp);
 337
 338         LASSERT(tgt->lut_bottom);
 339         /** VBR: set client last_epoch to current epoch */
 340         if (lcd->lcd_last_epoch >= tgt->lut_lsd.lsd_start_epoch)
 341                 return;
 342         lcd->lcd_last_epoch = tgt->lut_lsd.lsd_start_epoch;
 343         tgt_client_data_update(env, exp);
 344 }
 345
 346 /**
 347  * Update boot epoch when recovery ends
 348  */
 349 void tgt_boot_epoch_update(struct lu_target *tgt)
 350 {
 351         struct lu_env            env;
 352         struct ptlrpc_request   *req;
 353         __u32                    start_epoch;
 354         struct list_head         client_list;
 355         int                      rc;
 356
 357         if (tgt->lut_obd->obd_stopping)
 358                 return;
 359
 360         rc = lu_env_init(&env, LCT_DT_THREAD);
 361         if (rc) {
 362                 CERROR("%s: can't initialize environment: rc = %d\n",
 363                         tgt->lut_obd->obd_name, rc);
 364                 return;
 365         }
 366
 367         spin_lock(&tgt->lut_translock);
 368         start_epoch = lr_epoch(tgt->lut_last_transno) + 1;
 369         tgt->lut_last_transno = (__u64)start_epoch << LR_EPOCH_BITS;
 370         tgt->lut_lsd.lsd_start_epoch = start_epoch;
 371         spin_unlock(&tgt->lut_translock);
 372
 373         INIT_LIST_HEAD(&client_list);
 374         /**
 375          * The recovery is not yet finished and final queue can still be updated
 376          * with resend requests. Move final list to separate one for processing
 377          */
 378         spin_lock(&tgt->lut_obd->obd_recovery_task_lock);
 379         list_splice_init(&tgt->lut_obd->obd_final_req_queue, &client_list);
 380         spin_unlock(&tgt->lut_obd->obd_recovery_task_lock);
 381
 382         /**
 383          * go through list of exports participated in recovery and
 384          * set new epoch for them
 385          */
 386         list_for_each_entry(req, &client_list, rq_list) {
 387                 LASSERT(!req->rq_export->exp_delayed);
 388                 if (!req->rq_export->exp_vbr_failed)
 389                         tgt_client_epoch_update(&env, req->rq_export);
 390         }
 391         /** return list back at once */
 392         spin_lock(&tgt->lut_obd->obd_recovery_task_lock);
 393         list_splice_init(&client_list, &tgt->lut_obd->obd_final_req_queue);
 394         spin_unlock(&tgt->lut_obd->obd_recovery_task_lock);
 395         /** update server epoch */
 396         tgt_server_data_update(&env, tgt, 1);
 397         lu_env_fini(&env);
 398 }
 399 EXPORT_SYMBOL(tgt_boot_epoch_update);
 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 EXPORT_SYMBOL(tgt_last_commit_cb_add);
 473
 474 struct tgt_new_client_callback {
 475         struct dt_txn_commit_cb  lncc_cb;
 476         struct obd_export       *lncc_exp;
 477 };
 478
 479 static void tgt_cb_new_client(struct lu_env *env, struct thandle *th,
 480                               struct dt_txn_commit_cb *cb, int err)
 481 {
 482         struct tgt_new_client_callback *ccb;
 483
 484         ccb = container_of0(cb, struct tgt_new_client_callback, lncc_cb);
 485
 486         LASSERT(ccb->lncc_exp->exp_obd);
 487
 488         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 489                ccb->lncc_exp->exp_obd->obd_name,
 490                ccb->lncc_exp->exp_client_uuid.uuid);
 491
 492         spin_lock(&ccb->lncc_exp->exp_lock);
 493         /* XXX: Currently, we use per-export based sync/async policy for
 494          *      the update via OUT RPC, it is coarse-grained policy, and
 495          *      will be changed as per-request based by DNE II patches. */
 496         if (!ccb->lncc_exp->exp_keep_sync)
 497                 ccb->lncc_exp->exp_need_sync = 0;
 498
 499         spin_unlock(&ccb->lncc_exp->exp_lock);
 500         class_export_cb_put(ccb->lncc_exp);
 501
 502         OBD_FREE_PTR(ccb);
 503 }
 504
 505 int tgt_new_client_cb_add(struct thandle *th, struct obd_export *exp)
 506 {
 507         struct tgt_new_client_callback  *ccb;
 508         struct dt_txn_commit_cb         *dcb;
 509         int                              rc;
 510
 511         OBD_ALLOC_PTR(ccb);
 512         if (ccb == NULL)
 513                 return -ENOMEM;
 514
 515         ccb->lncc_exp = class_export_cb_get(exp);
 516
 517         dcb = &ccb->lncc_cb;
 518         dcb->dcb_func = tgt_cb_new_client;
 519         INIT_LIST_HEAD(&dcb->dcb_linkage);
 520         strlcpy(dcb->dcb_name, "tgt_cb_new_client", sizeof(dcb->dcb_name));
 521
 522         rc = dt_trans_cb_add(th, dcb);
 523         if (rc) {
 524                 class_export_cb_put(exp);
 525                 OBD_FREE_PTR(ccb);
 526         }
 527         return rc;
 528 }
 529
 530 /**
 531  * Add new client to the last_rcvd upon new connection.
 532  *
 533  * We use a bitmap to locate a free space in the last_rcvd file and initialize
 534  * tg_export_data.
 535  */
 536 int tgt_client_new(const struct lu_env *env, struct obd_export *exp)
 537 {
 538         struct tg_export_data   *ted = &exp->exp_target_data;
 539         struct lu_target        *tgt = class_exp2tgt(exp);
 540         int                      rc = 0, idx;
 541
 542         ENTRY;
 543
 544         LASSERT(tgt->lut_client_bitmap != NULL);
 545         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid))
 546                 RETURN(0);
 547
 548         mutex_init(&ted->ted_lcd_lock);
 549
 550         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 551                 RETURN(0);
 552
 553         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 554          * there's no need for extra complication here
 555          */
 556         idx = find_first_zero_bit(tgt->lut_client_bitmap, LR_MAX_CLIENTS);
 557 repeat:
 558         if (idx >= LR_MAX_CLIENTS ||
 559             OBD_FAIL_CHECK(OBD_FAIL_MDS_CLIENT_ADD)) {
 560                 CERROR("%s: no room for %u clients - fix LR_MAX_CLIENTS\n",
 561                        tgt->lut_obd->obd_name,  idx);
 562                 RETURN(-EOVERFLOW);
 563         }
 564         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 565                 idx = find_next_zero_bit(tgt->lut_client_bitmap,
 566                                              LR_MAX_CLIENTS, idx);
 567                 goto repeat;
 568         }
 569
 570         CDEBUG(D_INFO, "%s: client at idx %d with UUID '%s' added\n",
 571                tgt->lut_obd->obd_name, idx, ted->ted_lcd->lcd_uuid);
 572
 573         ted->ted_lr_idx = idx;
 574         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
 575                           idx * tgt->lut_lsd.lsd_client_size;
 576
 577         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 578
 579         CDEBUG(D_INFO, "%s: new client at index %d (%llu) with UUID '%s'\n",
 580                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
 581                ted->ted_lcd->lcd_uuid);
 582
 583         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_CLIENT_ADD))
 584                 RETURN(-ENOSPC);
 585
 586         rc = tgt_client_data_update(env, exp);
 587         if (rc)
 588                 CERROR("%s: Failed to write client lcd at idx %d, rc %d\n",
 589                        tgt->lut_obd->obd_name, idx, rc);
 590
 591         RETURN(rc);
 592 }
 593 EXPORT_SYMBOL(tgt_client_new);
 594
 595 /* Add client data to the MDS.  We use a bitmap to locate a free space
 596  * in the last_rcvd file if cl_off is -1 (i.e. a new client).
 597  * Otherwise, we just have to read the data from the last_rcvd file and
 598  * we know its offset.
 599  *
 600  * It should not be possible to fail adding an existing client - otherwise
 601  * mdt_init_server_data() callsite needs to be fixed.
 602  */
 603 int tgt_client_add(const struct lu_env *env,  struct obd_export *exp, int idx)
 604 {
 605         struct tg_export_data   *ted = &exp->exp_target_data;
 606         struct lu_target        *tgt = class_exp2tgt(exp);
 607
 608         ENTRY;
 609
 610         LASSERT(tgt->lut_client_bitmap != NULL);
 611         LASSERTF(idx >= 0, "%d\n", idx);
 612
 613         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid) ||
 614             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 615                 RETURN(0);
 616
 617         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 618                 CERROR("%s: client %d: bit already set in bitmap!!\n",
 619                        tgt->lut_obd->obd_name,  idx);
 620                 LBUG();
 621         }
 622
 623         CDEBUG(D_INFO, "%s: client at idx %d with UUID '%s' added\n",
 624                tgt->lut_obd->obd_name, idx, ted->ted_lcd->lcd_uuid);
 625
 626         ted->ted_lr_idx = idx;
 627         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
 628                           idx * tgt->lut_lsd.lsd_client_size;
 629
 630         mutex_init(&ted->ted_lcd_lock);
 631
 632         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 633
 634         RETURN(0);
 635 }
 636 EXPORT_SYMBOL(tgt_client_add);
 637
 638 int tgt_client_del(const struct lu_env *env, struct obd_export *exp)
 639 {
 640         struct tg_export_data   *ted = &exp->exp_target_data;
 641         struct lu_target        *tgt = class_exp2tgt(exp);
 642         int                      rc;
 643
 644         ENTRY;
 645
 646         LASSERT(ted->ted_lcd);
 647
 648         /* XXX if lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 649         if (!strcmp((char *)ted->ted_lcd->lcd_uuid,
 650                     (char *)tgt->lut_obd->obd_uuid.uuid) ||
 651             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 652                 RETURN(0);
 653
 654         CDEBUG(D_INFO, "%s: del client at idx %u, off %lld, UUID '%s'\n",
 655                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
 656                ted->ted_lcd->lcd_uuid);
 657
 658         /* Clear the bit _after_ zeroing out the client so we don't
 659            race with filter_client_add and zero out new clients.*/
 660         if (!test_bit(ted->ted_lr_idx, tgt->lut_client_bitmap)) {
 661                 CERROR("%s: client %u: bit already clear in bitmap!!\n",
 662                        tgt->lut_obd->obd_name, ted->ted_lr_idx);
 663                 LBUG();
 664         }
 665
 666         /* Do not erase record for recoverable client. */
 667         if (exp->exp_flags & OBD_OPT_FAILOVER)
 668                 RETURN(0);
 669
 670         /* Make sure the server's last_transno is up to date.
 671          * This should be done before zeroing client slot so last_transno will
 672          * be in server data or in client data in case of failure */
 673         rc = tgt_server_data_update(env, tgt, 0);
 674         if (rc != 0) {
 675                 CERROR("%s: failed to update server data, skip client %s "
 676                        "zeroing, rc %d\n", tgt->lut_obd->obd_name,
 677                        ted->ted_lcd->lcd_uuid, rc);
 678                 RETURN(rc);
 679         }
 680
 681         mutex_lock(&ted->ted_lcd_lock);
 682         memset(ted->ted_lcd->lcd_uuid, 0, sizeof ted->ted_lcd->lcd_uuid);
 683         rc = tgt_client_data_update(env, exp);
 684         mutex_unlock(&ted->ted_lcd_lock);
 685
 686         CDEBUG(rc == 0 ? D_INFO : D_ERROR,
 687                "%s: zeroing out client %s at idx %u (%llu), rc %d\n",
 688                tgt->lut_obd->obd_name, ted->ted_lcd->lcd_uuid,
 689                ted->ted_lr_idx, ted->ted_lr_off, rc);
 690         RETURN(rc);
 691 }
 692 EXPORT_SYMBOL(tgt_client_del);
 693
 694 /*
 695  * last_rcvd & last_committed update callbacks
 696  */
 697 static int tgt_last_rcvd_update(const struct lu_env *env, struct lu_target *tgt,
 698                                 struct dt_object *obj, __u64 opdata,
 699                                 struct thandle *th, struct ptlrpc_request *req)
 700 {
 701         struct tgt_thread_info  *tti = tgt_th_info(env);
 702         struct tg_export_data   *ted;
 703         __u64                   *transno_p;
 704         int                      rc = 0;
 705         bool                     lw_client, update = false;
 706
 707         ENTRY;
 708
 709         ted = &req->rq_export->exp_target_data;
 710
 711         lw_client = exp_connect_flags(req->rq_export) & OBD_CONNECT_LIGHTWEIGHT;
 712         if (ted->ted_lr_idx < 0 && !lw_client)
 713                 /* ofd connect may cause transaction before export has
 714                  * last_rcvd slot */
 715                 RETURN(0);
 716
 717         tti->tti_transno = lustre_msg_get_transno(req->rq_reqmsg);
 718
 719         spin_lock(&tgt->lut_translock);
 720         if (th->th_result != 0) {
 721                 if (tti->tti_transno != 0) {
 722                         CERROR("%s: replay transno "LPU64" failed: rc = %d\n",
 723                                tgt_name(tgt), tti->tti_transno, th->th_result);
 724                 }
 725         } else if (tti->tti_transno == 0) {
 726                 tti->tti_transno = ++tgt->lut_last_transno;
 727         } else {
 728                 /* should be replay */
 729                 if (tti->tti_transno > tgt->lut_last_transno)
 730                         tgt->lut_last_transno = tti->tti_transno;
 731         }
 732         spin_unlock(&tgt->lut_translock);
 733
 734         /** VBR: set new versions */
 735         if (th->th_result == 0 && obj != NULL)
 736                 dt_version_set(env, obj, tti->tti_transno, th);
 737
 738         /* filling reply data */
 739         CDEBUG(D_INODE, "transno = "LPU64", last_committed = "LPU64"\n",
 740                tti->tti_transno, tgt->lut_obd->obd_last_committed);
 741
 742         req->rq_transno = tti->tti_transno;
 743         lustre_msg_set_transno(req->rq_repmsg, tti->tti_transno);
 744
 745         /* if can't add callback, do sync write */
 746         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, req->rq_export,
 747                                                 tti->tti_transno);
 748
 749         if (lw_client) {
 750                 /* All operations performed by LW clients are synchronous and
 751                  * we store the committed transno in the last_rcvd header */
 752                 spin_lock(&tgt->lut_translock);
 753                 if (tti->tti_transno > tgt->lut_lsd.lsd_last_transno) {
 754                         tgt->lut_lsd.lsd_last_transno = tti->tti_transno;
 755                         update = true;
 756                 }
 757                 spin_unlock(&tgt->lut_translock);
 758                 /* Although lightweight (LW) connections have no slot in
 759                  * last_rcvd, we still want to maintain the in-memory
 760                  * lsd_client_data structure in order to properly handle reply
 761                  * reconstruction. */
 762         } else if (ted->ted_lr_off == 0) {
 763                 CERROR("%s: client idx %d has offset %lld\n",
 764                        tgt_name(tgt), ted->ted_lr_idx, ted->ted_lr_off);
 765                 RETURN(-EINVAL);
 766         }
 767
 768         /* if the export has already been disconnected, we have no last_rcvd
 769          * slot, update server data with latest transno then */
 770         if (ted->ted_lcd == NULL) {
 771                 CWARN("commit transaction for disconnected client %s: rc %d\n",
 772                       req->rq_export->exp_client_uuid.uuid, rc);
 773                 GOTO(srv_update, rc = 0);
 774         }
 775
 776         mutex_lock(&ted->ted_lcd_lock);
 777         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
 778         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
 779             lustre_msg_get_opc(req->rq_reqmsg) == MDS_DONE_WRITING) {
 780                 transno_p = &ted->ted_lcd->lcd_last_close_transno;
 781                 ted->ted_lcd->lcd_last_close_xid = req->rq_xid;
 782                 ted->ted_lcd->lcd_last_close_result = th->th_result;
 783         } else {
 784                 /* VBR: save versions in last_rcvd for reconstruct. */
 785                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
 786
 787                 if (pre_versions) {
 788                         ted->ted_lcd->lcd_pre_versions[0] = pre_versions[0];
 789                         ted->ted_lcd->lcd_pre_versions[1] = pre_versions[1];
 790                         ted->ted_lcd->lcd_pre_versions[2] = pre_versions[2];
 791                         ted->ted_lcd->lcd_pre_versions[3] = pre_versions[3];
 792                 }
 793                 transno_p = &ted->ted_lcd->lcd_last_transno;
 794                 ted->ted_lcd->lcd_last_xid = req->rq_xid;
 795                 ted->ted_lcd->lcd_last_result = th->th_result;
 796                 /* XXX: lcd_last_data is __u32 but intent_dispostion is __u64,
 797                  * see struct ldlm_reply->lock_policy_res1; */
 798                 ted->ted_lcd->lcd_last_data = opdata;
 799         }
 800
 801         /* Update transno in slot only if non-zero number, i.e. no errors */
 802         if (likely(tti->tti_transno != 0)) {
 803                 if (*transno_p > tti->tti_transno &&
 804                     !tgt->lut_no_reconstruct) {
 805                         CERROR("%s: trying to overwrite bigger transno:"
 806                                "on-disk: "LPU64", new: "LPU64" replay: %d. "
 807                                "see LU-617.\n", tgt_name(tgt), *transno_p,
 808                                tti->tti_transno, req_is_replay(req));
 809                         if (req_is_replay(req)) {
 810                                 spin_lock(&req->rq_export->exp_lock);
 811                                 req->rq_export->exp_vbr_failed = 1;
 812                                 spin_unlock(&req->rq_export->exp_lock);
 813                         }
 814                         mutex_unlock(&ted->ted_lcd_lock);
 815                         RETURN(req_is_replay(req) ? -EOVERFLOW : 0);
 816                 }
 817                 *transno_p = tti->tti_transno;
 818         }
 819
 820         if (!lw_client) {
 821                 tti->tti_off = ted->ted_lr_off;
 822                 rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 823                 if (rc < 0) {
 824                         mutex_unlock(&ted->ted_lcd_lock);
 825                         RETURN(rc);
 826                 }
 827         }
 828         mutex_unlock(&ted->ted_lcd_lock);
 829         EXIT;
 830 srv_update:
 831         if (update)
 832                 rc = tgt_server_data_write(env, tgt, th);
 833         return rc;
 834 }
 835
 836 /*
 837  * last_rcvd update for echo client simulation.
 838  * It updates last_rcvd client slot and version of object in
 839  * simple way but with all locks to simulate all drawbacks
 840  */
 841 static int tgt_last_rcvd_update_echo(const struct lu_env *env,
 842                                      struct lu_target *tgt,
 843                                      struct dt_object *obj,
 844                                      struct thandle *th,
 845                                      struct obd_export *exp)
 846 {
 847         struct tgt_thread_info  *tti = tgt_th_info(env);
 848         struct tg_export_data   *ted = &exp->exp_target_data;
 849         int                      rc = 0;
 850
 851         ENTRY;
 852
 853         tti->tti_transno = 0;
 854
 855         spin_lock(&tgt->lut_translock);
 856         if (th->th_result == 0)
 857                 tti->tti_transno = ++tgt->lut_last_transno;
 858         spin_unlock(&tgt->lut_translock);
 859
 860         /** VBR: set new versions */
 861         if (th->th_result == 0 && obj != NULL)
 862                 dt_version_set(env, obj, tti->tti_transno, th);
 863
 864         /* if can't add callback, do sync write */
 865         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, exp,
 866                                                 tti->tti_transno);
 867
 868         LASSERT(ted->ted_lr_off > 0);
 869
 870         mutex_lock(&ted->ted_lcd_lock);
 871         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
 872         ted->ted_lcd->lcd_last_transno = tti->tti_transno;
 873         ted->ted_lcd->lcd_last_result = th->th_result;
 874
 875         tti->tti_off = ted->ted_lr_off;
 876         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 877         mutex_unlock(&ted->ted_lcd_lock);
 878         RETURN(rc);
 879 }
 880
 881 static int tgt_clients_data_init(const struct lu_env *env,
 882                                  struct lu_target *tgt,
 883                                  unsigned long last_size)
 884 {
 885         struct obd_device       *obd = tgt->lut_obd;
 886         struct lr_server_data   *lsd = &tgt->lut_lsd;
 887         struct lsd_client_data  *lcd = NULL;
 888         struct tg_export_data   *ted;
 889         int                      cl_idx;
 890         int                      rc = 0;
 891         loff_t                   off = lsd->lsd_client_start;
 892
 893         ENTRY;
 894
 895         CLASSERT(offsetof(struct lsd_client_data, lcd_padding) +
 896                  sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
 897
 898         OBD_ALLOC_PTR(lcd);
 899         if (lcd == NULL)
 900                 RETURN(-ENOMEM);
 901
 902         for (cl_idx = 0; off < last_size; cl_idx++) {
 903                 struct obd_export       *exp;
 904                 __u64                    last_transno;
 905
 906                 /* Don't assume off is incremented properly by
 907                  * read_record(), in case sizeof(*lcd)
 908                  * isn't the same as fsd->lsd_client_size.  */
 909                 off = lsd->lsd_client_start + cl_idx * lsd->lsd_client_size;
 910                 rc = tgt_client_data_read(env, tgt, lcd, &off, cl_idx);
 911                 if (rc) {
 912                         CERROR("%s: error reading last_rcvd %s idx %d off "
 913                                "%llu: rc = %d\n", tgt_name(tgt), LAST_RCVD,
 914                                cl_idx, off, rc);
 915                         rc = 0;
 916                         break; /* read error shouldn't cause startup to fail */
 917                 }
 918
 919                 if (lcd->lcd_uuid[0] == '\0') {
 920                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
 921                                cl_idx);
 922                         continue;
 923                 }
 924
 925                 last_transno = lcd_last_transno(lcd);
 926
 927                 /* These exports are cleaned up by disconnect, so they
 928                  * need to be set up like real exports as connect does.
 929                  */
 930                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
 931                        " srv lr: "LPU64" lx: "LPU64"\n", lcd->lcd_uuid, cl_idx,
 932                        last_transno, lsd->lsd_last_transno, lcd_last_xid(lcd));
 933
 934                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
 935                 if (IS_ERR(exp)) {
 936                         if (PTR_ERR(exp) == -EALREADY) {
 937                                 /* export already exists, zero out this one */
 938                                 CERROR("%s: Duplicate export %s!\n",
 939                                        tgt_name(tgt), lcd->lcd_uuid);
 940                                 continue;
 941                         }
 942                         GOTO(err_out, rc = PTR_ERR(exp));
 943                 }
 944
 945                 ted = &exp->exp_target_data;
 946                 *ted->ted_lcd = *lcd;
 947
 948                 rc = tgt_client_add(env, exp, cl_idx);
 949                 LASSERTF(rc == 0, "rc = %d\n", rc); /* can't fail existing */
 950                 /* VBR: set export last committed version */
 951                 exp->exp_last_committed = last_transno;
 952                 spin_lock(&exp->exp_lock);
 953                 exp->exp_connecting = 0;
 954                 exp->exp_in_recovery = 0;
 955                 spin_unlock(&exp->exp_lock);
 956                 obd->obd_max_recoverable_clients++;
 957                 class_export_put(exp);
 958
 959                 /* Need to check last_rcvd even for duplicated exports. */
 960                 CDEBUG(D_OTHER, "client at idx %d has last_transno = "LPU64"\n",
 961                        cl_idx, last_transno);
 962
 963                 spin_lock(&tgt->lut_translock);
 964                 tgt->lut_last_transno = max(last_transno,
 965                                             tgt->lut_last_transno);
 966                 spin_unlock(&tgt->lut_translock);
 967         }
 968
 969 err_out:
 970         OBD_FREE_PTR(lcd);
 971         RETURN(rc);
 972 }
 973
 974 struct server_compat_data {
 975         __u32 rocompat;
 976         __u32 incompat;
 977         __u32 rocinit;
 978         __u32 incinit;
 979 };
 980
 981 static struct server_compat_data tgt_scd[] = {
 982         [LDD_F_SV_TYPE_MDT] = {
 983                 .rocompat = OBD_ROCOMPAT_LOVOBJID,
 984                 .incompat = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
 985                             OBD_INCOMPAT_FID | OBD_INCOMPAT_IAM_DIR |
 986                             OBD_INCOMPAT_LMM_VER | OBD_INCOMPAT_MULTI_OI,
 987                 .rocinit = OBD_ROCOMPAT_LOVOBJID,
 988                 .incinit = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
 989                            OBD_INCOMPAT_MULTI_OI,
 990         },
 991         [LDD_F_SV_TYPE_OST] = {
 992                 .rocompat = 0,
 993                 .incompat = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR |
 994                             OBD_INCOMPAT_FID,
 995                 .rocinit = 0,
 996                 .incinit = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR,
 997         }
 998 };
 999
1000 int tgt_server_data_init(const struct lu_env *env, struct lu_target *tgt)
1001 {
1002         struct tgt_thread_info          *tti = tgt_th_info(env);
1003         struct lr_server_data           *lsd = &tgt->lut_lsd;
1004         unsigned long                    last_rcvd_size;
1005         __u32                            index;
1006         int                              rc, type;
1007
1008         rc = dt_attr_get(env, tgt->lut_last_rcvd, &tti->tti_attr, BYPASS_CAPA);
1009         if (rc)
1010                 RETURN(rc);
1011
1012         last_rcvd_size = (unsigned long)tti->tti_attr.la_size;
1013
1014         /* ensure padding in the struct is the correct size */
1015         CLASSERT(offsetof(struct lr_server_data, lsd_padding) +
1016                  sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
1017
1018         rc = server_name2index(tgt_name(tgt), &index, NULL);
1019         if (rc < 0) {
1020                 CERROR("%s: Can not get index from name: rc = %d\n",
1021                        tgt_name(tgt), rc);
1022                 RETURN(rc);
1023         }
1024         /* server_name2index() returns type */
1025         type = rc;
1026         if (type != LDD_F_SV_TYPE_MDT && type != LDD_F_SV_TYPE_OST) {
1027                 CERROR("%s: unknown target type %x\n", tgt_name(tgt), type);
1028                 RETURN(-EINVAL);
1029         }
1030
1031         /* last_rcvd on OST doesn't provide reconstruct support because there
1032          * may be up to 8 in-flight write requests per single slot in
1033          * last_rcvd client data
1034          */
1035         tgt->lut_no_reconstruct = (type == LDD_F_SV_TYPE_OST);
1036
1037         if (last_rcvd_size == 0) {
1038                 LCONSOLE_WARN("%s: new disk, initializing\n", tgt_name(tgt));
1039
1040                 memcpy(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid,
1041                        sizeof(lsd->lsd_uuid));
1042                 lsd->lsd_last_transno = 0;
1043                 lsd->lsd_mount_count = 0;
1044                 lsd->lsd_server_size = LR_SERVER_SIZE;
1045                 lsd->lsd_client_start = LR_CLIENT_START;
1046                 lsd->lsd_client_size = LR_CLIENT_SIZE;
1047                 lsd->lsd_subdir_count = OBJ_SUBDIR_COUNT;
1048                 lsd->lsd_osd_index = index;
1049                 lsd->lsd_feature_rocompat = tgt_scd[type].rocinit;
1050                 lsd->lsd_feature_incompat = tgt_scd[type].incinit;
1051         } else {
1052                 rc = tgt_server_data_read(env, tgt);
1053                 if (rc) {
1054                         CERROR("%s: error reading LAST_RCVD: rc= %d\n",
1055                                tgt_name(tgt), rc);
1056                         RETURN(rc);
1057                 }
1058                 if (strcmp(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid)) {
1059                         LCONSOLE_ERROR_MSG(0x157, "Trying to start OBD %s "
1060                                            "using the wrong disk %s. Were the"
1061                                            " /dev/ assignments rearranged?\n",
1062                                            tgt->lut_obd->obd_uuid.uuid,
1063                                            lsd->lsd_uuid);
1064                         RETURN(-EINVAL);
1065                 }
1066
1067                 if (lsd->lsd_osd_index != index) {
1068                         LCONSOLE_ERROR_MSG(0x157, "%s: index %d in last rcvd "
1069                                            "is different with the index %d in"
1070                                            "config log, It might be disk"
1071                                            "corruption!\n", tgt_name(tgt),
1072                                            lsd->lsd_osd_index, index);
1073                         RETURN(-EINVAL);
1074                 }
1075         }
1076
1077         if (lsd->lsd_feature_incompat & ~tgt_scd[type].incompat) {
1078                 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
1079                        tgt_name(tgt),
1080                        lsd->lsd_feature_incompat & ~tgt_scd[type].incompat);
1081                 RETURN(-EINVAL);
1082         }
1083
1084         if (type == LDD_F_SV_TYPE_MDT)
1085                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
1086
1087         if (lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat) {
1088                 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
1089                        tgt_name(tgt),
1090                        lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat);
1091                 RETURN(-EINVAL);
1092         }
1093         /** Interop: evict all clients at first boot with 1.8 last_rcvd */
1094         if (type == LDD_F_SV_TYPE_MDT &&
1095             !(lsd->lsd_feature_compat & OBD_COMPAT_20)) {
1096                 if (last_rcvd_size > lsd->lsd_client_start) {
1097                         LCONSOLE_WARN("%s: mounting at first time on 1.8 FS, "
1098                                       "remove all clients for interop needs\n",
1099                                       tgt_name(tgt));
1100                         rc = tgt_truncate_last_rcvd(env, tgt,
1101                                                     lsd->lsd_client_start);
1102                         if (rc)
1103                                 RETURN(rc);
1104                         last_rcvd_size = lsd->lsd_client_start;
1105                 }
1106                 /** set 2.0 flag to upgrade/downgrade between 1.8 and 2.0 */
1107                 lsd->lsd_feature_compat |= OBD_COMPAT_20;
1108         }
1109
1110         spin_lock(&tgt->lut_translock);
1111         tgt->lut_last_transno = lsd->lsd_last_transno;
1112         spin_unlock(&tgt->lut_translock);
1113
1114         lsd->lsd_mount_count++;
1115
1116         CDEBUG(D_INODE, "=======,=BEGIN DUMPING LAST_RCVD========\n");
1117         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
1118                tgt_name(tgt), tgt->lut_last_transno);
1119         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
1120                tgt_name(tgt), lsd->lsd_mount_count);
1121         CDEBUG(D_INODE, "%s: server data size: %u\n",
1122                tgt_name(tgt), lsd->lsd_server_size);
1123         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
1124                tgt_name(tgt), lsd->lsd_client_start);
1125         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
1126                tgt_name(tgt), lsd->lsd_client_size);
1127         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
1128                tgt_name(tgt), last_rcvd_size);
1129         CDEBUG(D_INODE, "%s: server subdir_count: %u\n",
1130                tgt_name(tgt), lsd->lsd_subdir_count);
1131         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", tgt_name(tgt),
1132                last_rcvd_size <= lsd->lsd_client_start ? 0 :
1133                (last_rcvd_size - lsd->lsd_client_start) /
1134                 lsd->lsd_client_size);
1135         CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
1136
1137         if (lsd->lsd_server_size == 0 || lsd->lsd_client_start == 0 ||
1138             lsd->lsd_client_size == 0) {
1139                 CERROR("%s: bad last_rcvd contents!\n", tgt_name(tgt));
1140                 RETURN(-EINVAL);
1141         }
1142
1143         if (!tgt->lut_obd->obd_replayable)
1144                 CWARN("%s: recovery support OFF\n", tgt_name(tgt));
1145
1146         rc = tgt_clients_data_init(env, tgt, last_rcvd_size);
1147         if (rc < 0)
1148                 GOTO(err_client, rc);
1149
1150         spin_lock(&tgt->lut_translock);
1151         /* obd_last_committed is used for compatibility
1152          * with other lustre recovery code */
1153         tgt->lut_obd->obd_last_committed = tgt->lut_last_transno;
1154         spin_unlock(&tgt->lut_translock);
1155
1156         tgt->lut_obd->u.obt.obt_mount_count = lsd->lsd_mount_count;
1157         tgt->lut_obd->u.obt.obt_instance = (__u32)lsd->lsd_mount_count;
1158
1159         /* save it, so mount count and last_transno is current */
1160         rc = tgt_server_data_update(env, tgt, 0);
1161         if (rc < 0)
1162                 GOTO(err_client, rc);
1163
1164         RETURN(0);
1165
1166 err_client:
1167         class_disconnect_exports(tgt->lut_obd);
1168         return rc;
1169 }
1170
1171 /* add credits for last_rcvd update */
1172 int tgt_txn_start_cb(const struct lu_env *env, struct thandle *th,
1173                      void *cookie)
1174 {
1175         struct lu_target        *tgt = cookie;
1176         struct tgt_session_info *tsi;
1177         struct tgt_thread_info  *tti = tgt_th_info(env);
1178         int                      rc;
1179
1180         /* if there is no session, then this transaction is not result of
1181          * request processing but some local operation */
1182         if (env->le_ses == NULL)
1183                 return 0;
1184
1185         LASSERT(tgt->lut_last_rcvd);
1186         tsi = tgt_ses_info(env);
1187         /* OFD may start transaction without export assigned */
1188         if (tsi->tsi_exp == NULL)
1189                 return 0;
1190
1191         tti_buf_lcd(tti);
1192         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
1193                                      &tti->tti_buf,
1194                                      tsi->tsi_exp->exp_target_data.ted_lr_off,
1195                                      th);
1196         if (rc)
1197                 return rc;
1198
1199         tti_buf_lsd(tti);
1200         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
1201                                      &tti->tti_buf, 0, th);
1202         if (rc)
1203                 return rc;
1204
1205         if (tsi->tsi_vbr_obj != NULL &&
1206             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu))
1207                 rc = dt_declare_version_set(env, tsi->tsi_vbr_obj, th);
1208
1209         return rc;
1210 }
1211
1212 /* Update last_rcvd records with latests transaction data */
1213 int tgt_txn_stop_cb(const struct lu_env *env, struct thandle *th,
1214                     void *cookie)
1215 {
1216         struct lu_target        *tgt = cookie;
1217         struct tgt_session_info *tsi;
1218         struct tgt_thread_info  *tti = tgt_th_info(env);
1219         struct dt_object        *obj = NULL;
1220         int                      rc;
1221         bool                     echo_client;
1222
1223         if (env->le_ses == NULL)
1224                 return 0;
1225
1226         tsi = tgt_ses_info(env);
1227         /* OFD may start transaction without export assigned */
1228         if (tsi->tsi_exp == NULL)
1229                 return 0;
1230
1231         echo_client = (tgt_ses_req(tsi) == NULL);
1232
1233         if (tti->tti_has_trans && !echo_client) {
1234                 if (tti->tti_mult_trans == 0) {
1235                         CDEBUG(D_HA, "More than one transaction "LPU64"\n",
1236                                tti->tti_transno);
1237                         RETURN(0);
1238                 }
1239                 /* we need another transno to be assigned */
1240                 tti->tti_transno = 0;
1241         } else if (th->th_result == 0) {
1242                 tti->tti_has_trans = 1;
1243         }
1244
1245         if (tsi->tsi_vbr_obj != NULL &&
1246             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu)) {
1247                 obj = tsi->tsi_vbr_obj;
1248         }
1249
1250         if (unlikely(echo_client)) /* echo client special case */
1251                 rc = tgt_last_rcvd_update_echo(env, tgt, obj, th,
1252                                                tsi->tsi_exp);
1253         else
1254                 rc = tgt_last_rcvd_update(env, tgt, obj, tsi->tsi_opdata, th,
1255                                           tgt_ses_req(tsi));
1256         return rc;
1257 }