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         struct dt_object        *dto;
 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         dto = dt_object_locate(tgt->lut_last_rcvd, th->th_dev);
 145         return dt_record_write(env, dto, &tti->tti_buf, off, th);
 146 }
 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         if (unlikely(tgt == NULL)) {
 163                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
 164                           class_exp2obd(exp)->obd_name);
 165                 RETURN(-EINVAL);
 166         }
 167
 168         th = dt_trans_create(env, tgt->lut_bottom);
 169         if (IS_ERR(th))
 170                 RETURN(PTR_ERR(th));
 171
 172         tti_buf_lcd(tti);
 173         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
 174                                      &tti->tti_buf,
 175                                      ted->ted_lr_off, th);
 176         if (rc)
 177                 GOTO(out, rc);
 178
 179         rc = dt_trans_start_local(env, tgt->lut_bottom, th);
 180         if (rc)
 181                 GOTO(out, rc);
 182         /*
 183          * Until this operations will be committed the sync is needed
 184          * for this export. This should be done _after_ starting the
 185          * transaction so that many connecting clients will not bring
 186          * server down with lots of sync writes.
 187          */
 188         rc = tgt_new_client_cb_add(th, exp);
 189         if (rc) {
 190                 /* can't add callback, do sync now */
 191                 th->th_sync = 1;
 192         } else {
 193                 spin_lock(&exp->exp_lock);
 194                 exp->exp_need_sync = 1;
 195                 spin_unlock(&exp->exp_lock);
 196         }
 197
 198         tti->tti_off = ted->ted_lr_off;
 199         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 200         EXIT;
 201 out:
 202         dt_trans_stop(env, tgt->lut_bottom, th);
 203         CDEBUG(D_INFO, "%s: update last_rcvd client data for UUID = %s, "
 204                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 205                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 206
 207         return rc;
 208 }
 209
 210 int tgt_server_data_read(const struct lu_env *env, struct lu_target *tgt)
 211 {
 212         struct tgt_thread_info  *tti = tgt_th_info(env);
 213         int                      rc;
 214
 215         tti->tti_off = 0;
 216         tti_buf_lsd(tti);
 217         rc = dt_record_read(env, tgt->lut_last_rcvd, &tti->tti_buf,
 218                             &tti->tti_off);
 219         if (rc == 0)
 220                 lsd_le_to_cpu(&tti->tti_lsd, &tgt->lut_lsd);
 221
 222         CDEBUG(D_INFO, "%s: read last_rcvd server data for UUID = %s, "
 223                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 224                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 225         return rc;
 226 }
 227
 228 int tgt_server_data_write(const struct lu_env *env, struct lu_target *tgt,
 229                           struct thandle *th)
 230 {
 231         struct tgt_thread_info  *tti = tgt_th_info(env);
 232         struct dt_object        *dto;
 233         int                      rc;
 234
 235         ENTRY;
 236
 237         tti->tti_off = 0;
 238         tti_buf_lsd(tti);
 239         lsd_cpu_to_le(&tgt->lut_lsd, &tti->tti_lsd);
 240
 241         dto = dt_object_locate(tgt->lut_last_rcvd, th->th_dev);
 242         rc = dt_record_write(env, dto, &tti->tti_buf, &tti->tti_off, th);
 243
 244         CDEBUG(D_INFO, "%s: write last_rcvd server data for UUID = %s, "
 245                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 246                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 247
 248         RETURN(rc);
 249 }
 250
 251 /**
 252  * Update server data in last_rcvd
 253  */
 254 int tgt_server_data_update(const struct lu_env *env, struct lu_target *tgt,
 255                            int sync)
 256 {
 257         struct tgt_thread_info  *tti = tgt_th_info(env);
 258         struct thandle          *th;
 259         int                      rc = 0;
 260
 261         ENTRY;
 262
 263         CDEBUG(D_SUPER,
 264                "%s: mount_count is "LPU64", last_transno is "LPU64"\n",
 265                tgt->lut_lsd.lsd_uuid, tgt->lut_obd->u.obt.obt_mount_count,
 266                tgt->lut_last_transno);
 267
 268         /* Always save latest transno to keep it fresh */
 269         spin_lock(&tgt->lut_translock);
 270         tgt->lut_lsd.lsd_last_transno = tgt->lut_last_transno;
 271         spin_unlock(&tgt->lut_translock);
 272
 273         th = dt_trans_create(env, tgt->lut_bottom);
 274         if (IS_ERR(th))
 275                 RETURN(PTR_ERR(th));
 276
 277         th->th_sync = sync;
 278
 279         tti_buf_lsd(tti);
 280         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
 281                                      &tti->tti_buf, tti->tti_off, th);
 282         if (rc)
 283                 GOTO(out, rc);
 284
 285         rc = dt_trans_start(env, tgt->lut_bottom, th);
 286         if (rc)
 287                 GOTO(out, rc);
 288
 289         rc = tgt_server_data_write(env, tgt, th);
 290 out:
 291         dt_trans_stop(env, tgt->lut_bottom, th);
 292
 293         CDEBUG(D_INFO, "%s: update last_rcvd server data for UUID = %s, "
 294                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 295                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 296         RETURN(rc);
 297 }
 298 EXPORT_SYMBOL(tgt_server_data_update);
 299
 300 int tgt_truncate_last_rcvd(const struct lu_env *env, struct lu_target *tgt,
 301                            loff_t size)
 302 {
 303         struct dt_object *dt = tgt->lut_last_rcvd;
 304         struct thandle   *th;
 305         struct lu_attr    attr;
 306         int               rc;
 307
 308         ENTRY;
 309
 310         attr.la_size = size;
 311         attr.la_valid = LA_SIZE;
 312
 313         th = dt_trans_create(env, tgt->lut_bottom);
 314         if (IS_ERR(th))
 315                 RETURN(PTR_ERR(th));
 316         rc = dt_declare_punch(env, dt, size, OBD_OBJECT_EOF, th);
 317         if (rc)
 318                 GOTO(cleanup, rc);
 319         rc = dt_declare_attr_set(env, dt, &attr, th);
 320         if (rc)
 321                 GOTO(cleanup, rc);
 322         rc = dt_trans_start_local(env, tgt->lut_bottom, th);
 323         if (rc)
 324                 GOTO(cleanup, rc);
 325
 326         rc = dt_punch(env, dt, size, OBD_OBJECT_EOF, th);
 327         if (rc == 0)
 328                 rc = dt_attr_set(env, dt, &attr, th);
 329
 330 cleanup:
 331         dt_trans_stop(env, tgt->lut_bottom, th);
 332
 333         RETURN(rc);
 334 }
 335
 336 static void tgt_client_epoch_update(const struct lu_env *env,
 337                                     struct obd_export *exp)
 338 {
 339         struct lsd_client_data  *lcd = exp->exp_target_data.ted_lcd;
 340         struct lu_target        *tgt = class_exp2tgt(exp);
 341
 342         LASSERT(tgt && tgt->lut_bottom);
 343         /** VBR: set client last_epoch to current epoch */
 344         if (lcd->lcd_last_epoch >= tgt->lut_lsd.lsd_start_epoch)
 345                 return;
 346         lcd->lcd_last_epoch = tgt->lut_lsd.lsd_start_epoch;
 347         tgt_client_data_update(env, exp);
 348 }
 349
 350 /**
 351  * Update boot epoch when recovery ends
 352  */
 353 void tgt_boot_epoch_update(struct lu_target *tgt)
 354 {
 355         struct lu_env            env;
 356         struct ptlrpc_request   *req;
 357         __u32                    start_epoch;
 358         struct list_head         client_list;
 359         int                      rc;
 360
 361         if (tgt->lut_obd->obd_stopping)
 362                 return;
 363
 364         rc = lu_env_init(&env, LCT_DT_THREAD);
 365         if (rc) {
 366                 CERROR("%s: can't initialize environment: rc = %d\n",
 367                         tgt->lut_obd->obd_name, rc);
 368                 return;
 369         }
 370
 371         spin_lock(&tgt->lut_translock);
 372         start_epoch = lr_epoch(tgt->lut_last_transno) + 1;
 373         tgt->lut_last_transno = (__u64)start_epoch << LR_EPOCH_BITS;
 374         tgt->lut_lsd.lsd_start_epoch = start_epoch;
 375         spin_unlock(&tgt->lut_translock);
 376
 377         INIT_LIST_HEAD(&client_list);
 378         /**
 379          * The recovery is not yet finished and final queue can still be updated
 380          * with resend requests. Move final list to separate one for processing
 381          */
 382         spin_lock(&tgt->lut_obd->obd_recovery_task_lock);
 383         list_splice_init(&tgt->lut_obd->obd_final_req_queue, &client_list);
 384         spin_unlock(&tgt->lut_obd->obd_recovery_task_lock);
 385
 386         /**
 387          * go through list of exports participated in recovery and
 388          * set new epoch for them
 389          */
 390         list_for_each_entry(req, &client_list, rq_list) {
 391                 LASSERT(!req->rq_export->exp_delayed);
 392                 if (!req->rq_export->exp_vbr_failed)
 393                         tgt_client_epoch_update(&env, req->rq_export);
 394         }
 395         /** return list back at once */
 396         spin_lock(&tgt->lut_obd->obd_recovery_task_lock);
 397         list_splice_init(&client_list, &tgt->lut_obd->obd_final_req_queue);
 398         spin_unlock(&tgt->lut_obd->obd_recovery_task_lock);
 399         /** update server epoch */
 400         tgt_server_data_update(&env, tgt, 1);
 401         lu_env_fini(&env);
 402 }
 403
 404 /**
 405  * commit callback, need to update last_commited value
 406  */
 407 struct tgt_last_committed_callback {
 408         struct dt_txn_commit_cb  llcc_cb;
 409         struct lu_target        *llcc_tgt;
 410         struct obd_export       *llcc_exp;
 411         __u64                    llcc_transno;
 412 };
 413
 414 static void tgt_cb_last_committed(struct lu_env *env, struct thandle *th,
 415                                   struct dt_txn_commit_cb *cb, int err)
 416 {
 417         struct tgt_last_committed_callback *ccb;
 418
 419         ccb = container_of0(cb, struct tgt_last_committed_callback, llcc_cb);
 420
 421         LASSERT(ccb->llcc_tgt != NULL);
 422         LASSERT(ccb->llcc_exp->exp_obd == ccb->llcc_tgt->lut_obd);
 423
 424         spin_lock(&ccb->llcc_tgt->lut_translock);
 425         if (ccb->llcc_transno > ccb->llcc_tgt->lut_obd->obd_last_committed)
 426                 ccb->llcc_tgt->lut_obd->obd_last_committed = ccb->llcc_transno;
 427
 428         LASSERT(ccb->llcc_exp);
 429         if (ccb->llcc_transno > ccb->llcc_exp->exp_last_committed) {
 430                 ccb->llcc_exp->exp_last_committed = ccb->llcc_transno;
 431                 spin_unlock(&ccb->llcc_tgt->lut_translock);
 432                 ptlrpc_commit_replies(ccb->llcc_exp);
 433         } else {
 434                 spin_unlock(&ccb->llcc_tgt->lut_translock);
 435         }
 436         class_export_cb_put(ccb->llcc_exp);
 437         if (ccb->llcc_transno)
 438                 CDEBUG(D_HA, "%s: transno "LPD64" is committed\n",
 439                        ccb->llcc_tgt->lut_obd->obd_name, ccb->llcc_transno);
 440         OBD_FREE_PTR(ccb);
 441 }
 442
 443 int tgt_last_commit_cb_add(struct thandle *th, struct lu_target *tgt,
 444                            struct obd_export *exp, __u64 transno)
 445 {
 446         struct tgt_last_committed_callback      *ccb;
 447         struct dt_txn_commit_cb                 *dcb;
 448         int                                      rc;
 449
 450         OBD_ALLOC_PTR(ccb);
 451         if (ccb == NULL)
 452                 return -ENOMEM;
 453
 454         ccb->llcc_tgt = tgt;
 455         ccb->llcc_exp = class_export_cb_get(exp);
 456         ccb->llcc_transno = transno;
 457
 458         dcb = &ccb->llcc_cb;
 459         dcb->dcb_func = tgt_cb_last_committed;
 460         INIT_LIST_HEAD(&dcb->dcb_linkage);
 461         strlcpy(dcb->dcb_name, "tgt_cb_last_committed", sizeof(dcb->dcb_name));
 462
 463         rc = dt_trans_cb_add(th, dcb);
 464         if (rc) {
 465                 class_export_cb_put(exp);
 466                 OBD_FREE_PTR(ccb);
 467         }
 468
 469         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 470                 /* report failure to force synchronous operation */
 471                 return -EPERM;
 472
 473         return rc;
 474 }
 475
 476 struct tgt_new_client_callback {
 477         struct dt_txn_commit_cb  lncc_cb;
 478         struct obd_export       *lncc_exp;
 479 };
 480
 481 static void tgt_cb_new_client(struct lu_env *env, struct thandle *th,
 482                               struct dt_txn_commit_cb *cb, int err)
 483 {
 484         struct tgt_new_client_callback *ccb;
 485
 486         ccb = container_of0(cb, struct tgt_new_client_callback, lncc_cb);
 487
 488         LASSERT(ccb->lncc_exp->exp_obd);
 489
 490         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 491                ccb->lncc_exp->exp_obd->obd_name,
 492                ccb->lncc_exp->exp_client_uuid.uuid);
 493
 494         spin_lock(&ccb->lncc_exp->exp_lock);
 495         /* XXX: Currently, we use per-export based sync/async policy for
 496          *      the update via OUT RPC, it is coarse-grained policy, and
 497          *      will be changed as per-request based by DNE II patches. */
 498         if (!ccb->lncc_exp->exp_keep_sync)
 499                 ccb->lncc_exp->exp_need_sync = 0;
 500
 501         spin_unlock(&ccb->lncc_exp->exp_lock);
 502         class_export_cb_put(ccb->lncc_exp);
 503
 504         OBD_FREE_PTR(ccb);
 505 }
 506
 507 int tgt_new_client_cb_add(struct thandle *th, struct obd_export *exp)
 508 {
 509         struct tgt_new_client_callback  *ccb;
 510         struct dt_txn_commit_cb         *dcb;
 511         int                              rc;
 512
 513         OBD_ALLOC_PTR(ccb);
 514         if (ccb == NULL)
 515                 return -ENOMEM;
 516
 517         ccb->lncc_exp = class_export_cb_get(exp);
 518
 519         dcb = &ccb->lncc_cb;
 520         dcb->dcb_func = tgt_cb_new_client;
 521         INIT_LIST_HEAD(&dcb->dcb_linkage);
 522         strlcpy(dcb->dcb_name, "tgt_cb_new_client", sizeof(dcb->dcb_name));
 523
 524         rc = dt_trans_cb_add(th, dcb);
 525         if (rc) {
 526                 class_export_cb_put(exp);
 527                 OBD_FREE_PTR(ccb);
 528         }
 529         return rc;
 530 }
 531
 532 /**
 533  * Add new client to the last_rcvd upon new connection.
 534  *
 535  * We use a bitmap to locate a free space in the last_rcvd file and initialize
 536  * tg_export_data.
 537  */
 538 int tgt_client_new(const struct lu_env *env, struct obd_export *exp)
 539 {
 540         struct tg_export_data   *ted = &exp->exp_target_data;
 541         struct lu_target        *tgt = class_exp2tgt(exp);
 542         int                      rc = 0, idx;
 543
 544         ENTRY;
 545
 546         LASSERT(tgt && tgt->lut_client_bitmap != NULL);
 547         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid))
 548                 RETURN(0);
 549
 550         mutex_init(&ted->ted_lcd_lock);
 551
 552         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 553                 RETURN(0);
 554
 555         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 556          * there's no need for extra complication here
 557          */
 558         idx = find_first_zero_bit(tgt->lut_client_bitmap, LR_MAX_CLIENTS);
 559 repeat:
 560         if (idx >= LR_MAX_CLIENTS ||
 561             OBD_FAIL_CHECK(OBD_FAIL_MDS_CLIENT_ADD)) {
 562                 CERROR("%s: no room for %u clients - fix LR_MAX_CLIENTS\n",
 563                        tgt->lut_obd->obd_name,  idx);
 564                 RETURN(-EOVERFLOW);
 565         }
 566         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 567                 idx = find_next_zero_bit(tgt->lut_client_bitmap,
 568                                              LR_MAX_CLIENTS, idx);
 569                 goto repeat;
 570         }
 571
 572         CDEBUG(D_INFO, "%s: client at idx %d with UUID '%s' added\n",
 573                tgt->lut_obd->obd_name, idx, ted->ted_lcd->lcd_uuid);
 574
 575         ted->ted_lr_idx = idx;
 576         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
 577                           idx * tgt->lut_lsd.lsd_client_size;
 578
 579         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 580
 581         CDEBUG(D_INFO, "%s: new client at index %d (%llu) with UUID '%s'\n",
 582                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
 583                ted->ted_lcd->lcd_uuid);
 584
 585         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_CLIENT_ADD))
 586                 RETURN(-ENOSPC);
 587
 588         rc = tgt_client_data_update(env, exp);
 589         if (rc)
 590                 CERROR("%s: Failed to write client lcd at idx %d, rc %d\n",
 591                        tgt->lut_obd->obd_name, idx, rc);
 592
 593         RETURN(rc);
 594 }
 595 EXPORT_SYMBOL(tgt_client_new);
 596
 597 /* Add client data to the MDS.  We use a bitmap to locate a free space
 598  * in the last_rcvd file if cl_off is -1 (i.e. a new client).
 599  * Otherwise, we just have to read the data from the last_rcvd file and
 600  * we know its offset.
 601  *
 602  * It should not be possible to fail adding an existing client - otherwise
 603  * mdt_init_server_data() callsite needs to be fixed.
 604  */
 605 int tgt_client_add(const struct lu_env *env,  struct obd_export *exp, int idx)
 606 {
 607         struct tg_export_data   *ted = &exp->exp_target_data;
 608         struct lu_target        *tgt = class_exp2tgt(exp);
 609
 610         ENTRY;
 611
 612         LASSERT(tgt && tgt->lut_client_bitmap != NULL);
 613         LASSERTF(idx >= 0, "%d\n", idx);
 614
 615         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid) ||
 616             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 617                 RETURN(0);
 618
 619         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 620                 CERROR("%s: client %d: bit already set in bitmap!!\n",
 621                        tgt->lut_obd->obd_name,  idx);
 622                 LBUG();
 623         }
 624
 625         CDEBUG(D_INFO, "%s: client at idx %d with UUID '%s' added\n",
 626                tgt->lut_obd->obd_name, idx, ted->ted_lcd->lcd_uuid);
 627
 628         ted->ted_lr_idx = idx;
 629         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
 630                           idx * tgt->lut_lsd.lsd_client_size;
 631
 632         mutex_init(&ted->ted_lcd_lock);
 633
 634         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 635
 636         RETURN(0);
 637 }
 638
 639 int tgt_client_del(const struct lu_env *env, struct obd_export *exp)
 640 {
 641         struct tg_export_data   *ted = &exp->exp_target_data;
 642         struct lu_target        *tgt = class_exp2tgt(exp);
 643         int                      rc;
 644
 645         ENTRY;
 646
 647         LASSERT(ted->ted_lcd);
 648
 649         if (unlikely(tgt == NULL)) {
 650                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
 651                        class_exp2obd(exp)->obd_name);
 652                 RETURN(-EINVAL);
 653         }
 654
 655         /* XXX if lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 656         if (!strcmp((char *)ted->ted_lcd->lcd_uuid,
 657                     (char *)tgt->lut_obd->obd_uuid.uuid) ||
 658             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 659                 RETURN(0);
 660
 661         CDEBUG(D_INFO, "%s: del client at idx %u, off %lld, UUID '%s'\n",
 662                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
 663                ted->ted_lcd->lcd_uuid);
 664
 665         /* Clear the bit _after_ zeroing out the client so we don't
 666            race with filter_client_add and zero out new clients.*/
 667         if (!test_bit(ted->ted_lr_idx, tgt->lut_client_bitmap)) {
 668                 CERROR("%s: client %u: bit already clear in bitmap!!\n",
 669                        tgt->lut_obd->obd_name, ted->ted_lr_idx);
 670                 LBUG();
 671         }
 672
 673         /* Do not erase record for recoverable client. */
 674         if (exp->exp_flags & OBD_OPT_FAILOVER)
 675                 RETURN(0);
 676
 677         /* Make sure the server's last_transno is up to date.
 678          * This should be done before zeroing client slot so last_transno will
 679          * be in server data or in client data in case of failure */
 680         rc = tgt_server_data_update(env, tgt, 0);
 681         if (rc != 0) {
 682                 CERROR("%s: failed to update server data, skip client %s "
 683                        "zeroing, rc %d\n", tgt->lut_obd->obd_name,
 684                        ted->ted_lcd->lcd_uuid, rc);
 685                 RETURN(rc);
 686         }
 687
 688         mutex_lock(&ted->ted_lcd_lock);
 689         memset(ted->ted_lcd->lcd_uuid, 0, sizeof ted->ted_lcd->lcd_uuid);
 690         rc = tgt_client_data_update(env, exp);
 691         mutex_unlock(&ted->ted_lcd_lock);
 692
 693         CDEBUG(rc == 0 ? D_INFO : D_ERROR,
 694                "%s: zeroing out client %s at idx %u (%llu), rc %d\n",
 695                tgt->lut_obd->obd_name, ted->ted_lcd->lcd_uuid,
 696                ted->ted_lr_idx, ted->ted_lr_off, rc);
 697         RETURN(rc);
 698 }
 699 EXPORT_SYMBOL(tgt_client_del);
 700
 701 /*
 702  * last_rcvd & last_committed update callbacks
 703  */
 704 static int tgt_last_rcvd_update(const struct lu_env *env, struct lu_target *tgt,
 705                                 struct dt_object *obj, __u64 opdata,
 706                                 struct thandle *th, struct ptlrpc_request *req)
 707 {
 708         struct tgt_thread_info  *tti = tgt_th_info(env);
 709         struct tg_export_data   *ted;
 710         __u64                   *transno_p;
 711         int                      rc = 0;
 712         bool                     lw_client, update = false;
 713
 714         ENTRY;
 715
 716         ted = &req->rq_export->exp_target_data;
 717
 718         lw_client = exp_connect_flags(req->rq_export) & OBD_CONNECT_LIGHTWEIGHT;
 719         if (ted->ted_lr_idx < 0 && !lw_client)
 720                 /* ofd connect may cause transaction before export has
 721                  * last_rcvd slot */
 722                 RETURN(0);
 723
 724         tti->tti_transno = lustre_msg_get_transno(req->rq_reqmsg);
 725
 726         spin_lock(&tgt->lut_translock);
 727         if (th->th_result != 0) {
 728                 if (tti->tti_transno != 0) {
 729                         CERROR("%s: replay transno "LPU64" failed: rc = %d\n",
 730                                tgt_name(tgt), tti->tti_transno, th->th_result);
 731                 }
 732         } else if (tti->tti_transno == 0) {
 733                 tti->tti_transno = ++tgt->lut_last_transno;
 734         } else {
 735                 /* should be replay */
 736                 if (tti->tti_transno > tgt->lut_last_transno)
 737                         tgt->lut_last_transno = tti->tti_transno;
 738         }
 739         spin_unlock(&tgt->lut_translock);
 740
 741         /** VBR: set new versions */
 742         if (th->th_result == 0 && obj != NULL) {
 743                 struct dt_object *dto = dt_object_locate(obj, th->th_dev);
 744                 dt_version_set(env, dto, tti->tti_transno, th);
 745         }
 746
 747         /* filling reply data */
 748         CDEBUG(D_INODE, "transno = "LPU64", last_committed = "LPU64"\n",
 749                tti->tti_transno, tgt->lut_obd->obd_last_committed);
 750
 751         req->rq_transno = tti->tti_transno;
 752         lustre_msg_set_transno(req->rq_repmsg, tti->tti_transno);
 753
 754         /* if can't add callback, do sync write */
 755         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, req->rq_export,
 756                                                 tti->tti_transno);
 757
 758         if (lw_client) {
 759                 /* All operations performed by LW clients are synchronous and
 760                  * we store the committed transno in the last_rcvd header */
 761                 spin_lock(&tgt->lut_translock);
 762                 if (tti->tti_transno > tgt->lut_lsd.lsd_last_transno) {
 763                         tgt->lut_lsd.lsd_last_transno = tti->tti_transno;
 764                         update = true;
 765                 }
 766                 spin_unlock(&tgt->lut_translock);
 767                 /* Although lightweight (LW) connections have no slot in
 768                  * last_rcvd, we still want to maintain the in-memory
 769                  * lsd_client_data structure in order to properly handle reply
 770                  * reconstruction. */
 771         } else if (ted->ted_lr_off == 0) {
 772                 CERROR("%s: client idx %d has offset %lld\n",
 773                        tgt_name(tgt), ted->ted_lr_idx, ted->ted_lr_off);
 774                 RETURN(-EINVAL);
 775         }
 776
 777         /* if the export has already been disconnected, we have no last_rcvd
 778          * slot, update server data with latest transno then */
 779         if (ted->ted_lcd == NULL) {
 780                 CWARN("commit transaction for disconnected client %s: rc %d\n",
 781                       req->rq_export->exp_client_uuid.uuid, rc);
 782                 GOTO(srv_update, rc = 0);
 783         }
 784
 785         mutex_lock(&ted->ted_lcd_lock);
 786         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
 787         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE) {
 788                 transno_p = &ted->ted_lcd->lcd_last_close_transno;
 789                 ted->ted_lcd->lcd_last_close_xid = req->rq_xid;
 790                 ted->ted_lcd->lcd_last_close_result = th->th_result;
 791         } else {
 792                 /* VBR: save versions in last_rcvd for reconstruct. */
 793                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
 794
 795                 if (pre_versions) {
 796                         ted->ted_lcd->lcd_pre_versions[0] = pre_versions[0];
 797                         ted->ted_lcd->lcd_pre_versions[1] = pre_versions[1];
 798                         ted->ted_lcd->lcd_pre_versions[2] = pre_versions[2];
 799                         ted->ted_lcd->lcd_pre_versions[3] = pre_versions[3];
 800                 }
 801                 transno_p = &ted->ted_lcd->lcd_last_transno;
 802                 ted->ted_lcd->lcd_last_xid = req->rq_xid;
 803                 ted->ted_lcd->lcd_last_result = th->th_result;
 804                 /* XXX: lcd_last_data is __u32 but intent_dispostion is __u64,
 805                  * see struct ldlm_reply->lock_policy_res1; */
 806                 ted->ted_lcd->lcd_last_data = opdata;
 807         }
 808
 809         /* Update transno in slot only if non-zero number, i.e. no errors */
 810         if (likely(tti->tti_transno != 0)) {
 811                 if (*transno_p > tti->tti_transno &&
 812                     !tgt->lut_no_reconstruct) {
 813                         CERROR("%s: trying to overwrite bigger transno:"
 814                                "on-disk: "LPU64", new: "LPU64" replay: %d. "
 815                                "see LU-617.\n", tgt_name(tgt), *transno_p,
 816                                tti->tti_transno, req_is_replay(req));
 817                         if (req_is_replay(req)) {
 818                                 spin_lock(&req->rq_export->exp_lock);
 819                                 req->rq_export->exp_vbr_failed = 1;
 820                                 spin_unlock(&req->rq_export->exp_lock);
 821                         }
 822                         mutex_unlock(&ted->ted_lcd_lock);
 823                         RETURN(req_is_replay(req) ? -EOVERFLOW : 0);
 824                 }
 825                 *transno_p = tti->tti_transno;
 826         }
 827
 828         if (!lw_client) {
 829                 tti->tti_off = ted->ted_lr_off;
 830                 rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 831                 if (rc < 0) {
 832                         mutex_unlock(&ted->ted_lcd_lock);
 833                         RETURN(rc);
 834                 }
 835         }
 836         mutex_unlock(&ted->ted_lcd_lock);
 837         EXIT;
 838 srv_update:
 839         if (update)
 840                 rc = tgt_server_data_write(env, tgt, th);
 841         return rc;
 842 }
 843
 844 /*
 845  * last_rcvd update for echo client simulation.
 846  * It updates last_rcvd client slot and version of object in
 847  * simple way but with all locks to simulate all drawbacks
 848  */
 849 static int tgt_last_rcvd_update_echo(const struct lu_env *env,
 850                                      struct lu_target *tgt,
 851                                      struct dt_object *obj,
 852                                      struct thandle *th,
 853                                      struct obd_export *exp)
 854 {
 855         struct tgt_thread_info  *tti = tgt_th_info(env);
 856         struct tg_export_data   *ted = &exp->exp_target_data;
 857         int                      rc = 0;
 858
 859         ENTRY;
 860
 861         tti->tti_transno = 0;
 862
 863         spin_lock(&tgt->lut_translock);
 864         if (th->th_result == 0)
 865                 tti->tti_transno = ++tgt->lut_last_transno;
 866         spin_unlock(&tgt->lut_translock);
 867
 868         /** VBR: set new versions */
 869         if (th->th_result == 0 && obj != NULL)
 870                 dt_version_set(env, obj, tti->tti_transno, th);
 871
 872         /* if can't add callback, do sync write */
 873         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, exp,
 874                                                 tti->tti_transno);
 875
 876         LASSERT(ted->ted_lr_off > 0);
 877
 878         mutex_lock(&ted->ted_lcd_lock);
 879         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
 880         ted->ted_lcd->lcd_last_transno = tti->tti_transno;
 881         ted->ted_lcd->lcd_last_result = th->th_result;
 882
 883         tti->tti_off = ted->ted_lr_off;
 884         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 885         mutex_unlock(&ted->ted_lcd_lock);
 886         RETURN(rc);
 887 }
 888
 889 static int tgt_clients_data_init(const struct lu_env *env,
 890                                  struct lu_target *tgt,
 891                                  unsigned long last_size)
 892 {
 893         struct obd_device       *obd = tgt->lut_obd;
 894         struct lr_server_data   *lsd = &tgt->lut_lsd;
 895         struct lsd_client_data  *lcd = NULL;
 896         struct tg_export_data   *ted;
 897         int                      cl_idx;
 898         int                      rc = 0;
 899         loff_t                   off = lsd->lsd_client_start;
 900
 901         ENTRY;
 902
 903         CLASSERT(offsetof(struct lsd_client_data, lcd_padding) +
 904                  sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
 905
 906         OBD_ALLOC_PTR(lcd);
 907         if (lcd == NULL)
 908                 RETURN(-ENOMEM);
 909
 910         for (cl_idx = 0; off < last_size; cl_idx++) {
 911                 struct obd_export       *exp;
 912                 __u64                    last_transno;
 913
 914                 /* Don't assume off is incremented properly by
 915                  * read_record(), in case sizeof(*lcd)
 916                  * isn't the same as fsd->lsd_client_size.  */
 917                 off = lsd->lsd_client_start + cl_idx * lsd->lsd_client_size;
 918                 rc = tgt_client_data_read(env, tgt, lcd, &off, cl_idx);
 919                 if (rc) {
 920                         CERROR("%s: error reading last_rcvd %s idx %d off "
 921                                "%llu: rc = %d\n", tgt_name(tgt), LAST_RCVD,
 922                                cl_idx, off, rc);
 923                         rc = 0;
 924                         break; /* read error shouldn't cause startup to fail */
 925                 }
 926
 927                 if (lcd->lcd_uuid[0] == '\0') {
 928                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
 929                                cl_idx);
 930                         continue;
 931                 }
 932
 933                 last_transno = lcd_last_transno(lcd);
 934
 935                 /* These exports are cleaned up by disconnect, so they
 936                  * need to be set up like real exports as connect does.
 937                  */
 938                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
 939                        " srv lr: "LPU64" lx: "LPU64"\n", lcd->lcd_uuid, cl_idx,
 940                        last_transno, lsd->lsd_last_transno, lcd_last_xid(lcd));
 941
 942                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
 943                 if (IS_ERR(exp)) {
 944                         if (PTR_ERR(exp) == -EALREADY) {
 945                                 /* export already exists, zero out this one */
 946                                 CERROR("%s: Duplicate export %s!\n",
 947                                        tgt_name(tgt), lcd->lcd_uuid);
 948                                 continue;
 949                         }
 950                         GOTO(err_out, rc = PTR_ERR(exp));
 951                 }
 952
 953                 ted = &exp->exp_target_data;
 954                 *ted->ted_lcd = *lcd;
 955
 956                 rc = tgt_client_add(env, exp, cl_idx);
 957                 LASSERTF(rc == 0, "rc = %d\n", rc); /* can't fail existing */
 958                 /* VBR: set export last committed version */
 959                 exp->exp_last_committed = last_transno;
 960                 spin_lock(&exp->exp_lock);
 961                 exp->exp_connecting = 0;
 962                 exp->exp_in_recovery = 0;
 963                 spin_unlock(&exp->exp_lock);
 964                 obd->obd_max_recoverable_clients++;
 965                 class_export_put(exp);
 966
 967                 /* Need to check last_rcvd even for duplicated exports. */
 968                 CDEBUG(D_OTHER, "client at idx %d has last_transno = "LPU64"\n",
 969                        cl_idx, last_transno);
 970
 971                 spin_lock(&tgt->lut_translock);
 972                 tgt->lut_last_transno = max(last_transno,
 973                                             tgt->lut_last_transno);
 974                 spin_unlock(&tgt->lut_translock);
 975         }
 976
 977 err_out:
 978         OBD_FREE_PTR(lcd);
 979         RETURN(rc);
 980 }
 981
 982 struct server_compat_data {
 983         __u32 rocompat;
 984         __u32 incompat;
 985         __u32 rocinit;
 986         __u32 incinit;
 987 };
 988
 989 static struct server_compat_data tgt_scd[] = {
 990         [LDD_F_SV_TYPE_MDT] = {
 991                 .rocompat = OBD_ROCOMPAT_LOVOBJID,
 992                 .incompat = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
 993                             OBD_INCOMPAT_FID | OBD_INCOMPAT_IAM_DIR |
 994                             OBD_INCOMPAT_LMM_VER | OBD_INCOMPAT_MULTI_OI,
 995                 .rocinit = OBD_ROCOMPAT_LOVOBJID,
 996                 .incinit = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
 997                            OBD_INCOMPAT_MULTI_OI,
 998         },
 999         [LDD_F_SV_TYPE_OST] = {
1000                 .rocompat = OBD_ROCOMPAT_IDX_IN_IDIF,
1001                 .incompat = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR |
1002                             OBD_INCOMPAT_FID,
1003                 .rocinit = OBD_ROCOMPAT_IDX_IN_IDIF,
1004                 .incinit = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR,
1005         }
1006 };
1007
1008 int tgt_server_data_init(const struct lu_env *env, struct lu_target *tgt)
1009 {
1010         struct tgt_thread_info          *tti = tgt_th_info(env);
1011         struct lr_server_data           *lsd = &tgt->lut_lsd;
1012         unsigned long                    last_rcvd_size;
1013         __u32                            index;
1014         int                              rc, type;
1015
1016         rc = dt_attr_get(env, tgt->lut_last_rcvd, &tti->tti_attr);
1017         if (rc)
1018                 RETURN(rc);
1019
1020         last_rcvd_size = (unsigned long)tti->tti_attr.la_size;
1021
1022         /* ensure padding in the struct is the correct size */
1023         CLASSERT(offsetof(struct lr_server_data, lsd_padding) +
1024                  sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
1025
1026         rc = server_name2index(tgt_name(tgt), &index, NULL);
1027         if (rc < 0) {
1028                 CERROR("%s: Can not get index from name: rc = %d\n",
1029                        tgt_name(tgt), rc);
1030                 RETURN(rc);
1031         }
1032         /* server_name2index() returns type */
1033         type = rc;
1034         if (type != LDD_F_SV_TYPE_MDT && type != LDD_F_SV_TYPE_OST) {
1035                 CERROR("%s: unknown target type %x\n", tgt_name(tgt), type);
1036                 RETURN(-EINVAL);
1037         }
1038
1039         /* last_rcvd on OST doesn't provide reconstruct support because there
1040          * may be up to 8 in-flight write requests per single slot in
1041          * last_rcvd client data
1042          */
1043         tgt->lut_no_reconstruct = (type == LDD_F_SV_TYPE_OST);
1044
1045         if (last_rcvd_size == 0) {
1046                 LCONSOLE_WARN("%s: new disk, initializing\n", tgt_name(tgt));
1047
1048                 memcpy(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid,
1049                        sizeof(lsd->lsd_uuid));
1050                 lsd->lsd_last_transno = 0;
1051                 lsd->lsd_mount_count = 0;
1052                 lsd->lsd_server_size = LR_SERVER_SIZE;
1053                 lsd->lsd_client_start = LR_CLIENT_START;
1054                 lsd->lsd_client_size = LR_CLIENT_SIZE;
1055                 lsd->lsd_subdir_count = OBJ_SUBDIR_COUNT;
1056                 lsd->lsd_osd_index = index;
1057                 lsd->lsd_feature_rocompat = tgt_scd[type].rocinit;
1058                 lsd->lsd_feature_incompat = tgt_scd[type].incinit;
1059         } else {
1060                 rc = tgt_server_data_read(env, tgt);
1061                 if (rc) {
1062                         CERROR("%s: error reading LAST_RCVD: rc= %d\n",
1063                                tgt_name(tgt), rc);
1064                         RETURN(rc);
1065                 }
1066                 if (strcmp(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid)) {
1067                         LCONSOLE_ERROR_MSG(0x157, "Trying to start OBD %s "
1068                                            "using the wrong disk %s. Were the"
1069                                            " /dev/ assignments rearranged?\n",
1070                                            tgt->lut_obd->obd_uuid.uuid,
1071                                            lsd->lsd_uuid);
1072                         RETURN(-EINVAL);
1073                 }
1074
1075                 if (lsd->lsd_osd_index != index) {
1076                         LCONSOLE_ERROR_MSG(0x157, "%s: index %d in last rcvd "
1077                                            "is different with the index %d in"
1078                                            "config log, It might be disk"
1079                                            "corruption!\n", tgt_name(tgt),
1080                                            lsd->lsd_osd_index, index);
1081                         RETURN(-EINVAL);
1082                 }
1083         }
1084
1085         if (lsd->lsd_feature_incompat & ~tgt_scd[type].incompat) {
1086                 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
1087                        tgt_name(tgt),
1088                        lsd->lsd_feature_incompat & ~tgt_scd[type].incompat);
1089                 RETURN(-EINVAL);
1090         }
1091
1092         if (type == LDD_F_SV_TYPE_MDT)
1093                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
1094
1095         if (lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat) {
1096                 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
1097                        tgt_name(tgt),
1098                        lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat);
1099                 RETURN(-EINVAL);
1100         }
1101         /** Interop: evict all clients at first boot with 1.8 last_rcvd */
1102         if (type == LDD_F_SV_TYPE_MDT &&
1103             !(lsd->lsd_feature_compat & OBD_COMPAT_20)) {
1104                 if (last_rcvd_size > lsd->lsd_client_start) {
1105                         LCONSOLE_WARN("%s: mounting at first time on 1.8 FS, "
1106                                       "remove all clients for interop needs\n",
1107                                       tgt_name(tgt));
1108                         rc = tgt_truncate_last_rcvd(env, tgt,
1109                                                     lsd->lsd_client_start);
1110                         if (rc)
1111                                 RETURN(rc);
1112                         last_rcvd_size = lsd->lsd_client_start;
1113                 }
1114                 /** set 2.0 flag to upgrade/downgrade between 1.8 and 2.0 */
1115                 lsd->lsd_feature_compat |= OBD_COMPAT_20;
1116         }
1117
1118         spin_lock(&tgt->lut_translock);
1119         tgt->lut_last_transno = lsd->lsd_last_transno;
1120         spin_unlock(&tgt->lut_translock);
1121
1122         lsd->lsd_mount_count++;
1123
1124         CDEBUG(D_INODE, "=======,=BEGIN DUMPING LAST_RCVD========\n");
1125         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
1126                tgt_name(tgt), tgt->lut_last_transno);
1127         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
1128                tgt_name(tgt), lsd->lsd_mount_count);
1129         CDEBUG(D_INODE, "%s: server data size: %u\n",
1130                tgt_name(tgt), lsd->lsd_server_size);
1131         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
1132                tgt_name(tgt), lsd->lsd_client_start);
1133         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
1134                tgt_name(tgt), lsd->lsd_client_size);
1135         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
1136                tgt_name(tgt), last_rcvd_size);
1137         CDEBUG(D_INODE, "%s: server subdir_count: %u\n",
1138                tgt_name(tgt), lsd->lsd_subdir_count);
1139         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", tgt_name(tgt),
1140                last_rcvd_size <= lsd->lsd_client_start ? 0 :
1141                (last_rcvd_size - lsd->lsd_client_start) /
1142                 lsd->lsd_client_size);
1143         CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
1144
1145         if (lsd->lsd_server_size == 0 || lsd->lsd_client_start == 0 ||
1146             lsd->lsd_client_size == 0) {
1147                 CERROR("%s: bad last_rcvd contents!\n", tgt_name(tgt));
1148                 RETURN(-EINVAL);
1149         }
1150
1151         if (!tgt->lut_obd->obd_replayable)
1152                 CWARN("%s: recovery support OFF\n", tgt_name(tgt));
1153
1154         rc = tgt_clients_data_init(env, tgt, last_rcvd_size);
1155         if (rc < 0)
1156                 GOTO(err_client, rc);
1157
1158         spin_lock(&tgt->lut_translock);
1159         /* obd_last_committed is used for compatibility
1160          * with other lustre recovery code */
1161         tgt->lut_obd->obd_last_committed = tgt->lut_last_transno;
1162         spin_unlock(&tgt->lut_translock);
1163
1164         tgt->lut_obd->u.obt.obt_mount_count = lsd->lsd_mount_count;
1165         tgt->lut_obd->u.obt.obt_instance = (__u32)lsd->lsd_mount_count;
1166
1167         /* save it, so mount count and last_transno is current */
1168         rc = tgt_server_data_update(env, tgt, 0);
1169         if (rc < 0)
1170                 GOTO(err_client, rc);
1171
1172         RETURN(0);
1173
1174 err_client:
1175         class_disconnect_exports(tgt->lut_obd);
1176         return rc;
1177 }
1178
1179 /* add credits for last_rcvd update */
1180 int tgt_txn_start_cb(const struct lu_env *env, struct thandle *th,
1181                      void *cookie)
1182 {
1183         struct lu_target        *tgt = cookie;
1184         struct tgt_session_info *tsi;
1185         struct tgt_thread_info  *tti = tgt_th_info(env);
1186         struct dt_object        *dto;
1187         int                      rc;
1188
1189         /* if there is no session, then this transaction is not result of
1190          * request processing but some local operation */
1191         if (env->le_ses == NULL)
1192                 return 0;
1193
1194         LASSERT(tgt->lut_last_rcvd);
1195         tsi = tgt_ses_info(env);
1196         /* OFD may start transaction without export assigned */
1197         if (tsi->tsi_exp == NULL)
1198                 return 0;
1199
1200         dto = dt_object_locate(tgt->lut_last_rcvd, th->th_dev);
1201         tti_buf_lcd(tti);
1202
1203         rc = dt_declare_record_write(env, dto, &tti->tti_buf,
1204                                      tsi->tsi_exp->exp_target_data.ted_lr_off,
1205                                      th);
1206         if (rc)
1207                 return rc;
1208
1209         tti_buf_lsd(tti);
1210         rc = dt_declare_record_write(env, dto, &tti->tti_buf, 0, th);
1211         if (rc)
1212                 return rc;
1213
1214         if (tsi->tsi_vbr_obj != NULL &&
1215             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu)) {
1216                 dto = dt_object_locate(tsi->tsi_vbr_obj, th->th_dev);
1217                 rc = dt_declare_version_set(env, dto, th);
1218         }
1219
1220         return rc;
1221 }
1222
1223 /* Update last_rcvd records with latests transaction data */
1224 int tgt_txn_stop_cb(const struct lu_env *env, struct thandle *th,
1225                     void *cookie)
1226 {
1227         struct lu_target        *tgt = cookie;
1228         struct tgt_session_info *tsi;
1229         struct tgt_thread_info  *tti = tgt_th_info(env);
1230         struct dt_object        *obj = NULL;
1231         int                      rc;
1232         bool                     echo_client;
1233
1234         if (env->le_ses == NULL)
1235                 return 0;
1236
1237         tsi = tgt_ses_info(env);
1238         /* OFD may start transaction without export assigned */
1239         if (tsi->tsi_exp == NULL)
1240                 return 0;
1241
1242         echo_client = (tgt_ses_req(tsi) == NULL);
1243
1244         if (tti->tti_has_trans && !echo_client) {
1245                 if (tti->tti_mult_trans == 0) {
1246                         CDEBUG(D_HA, "More than one transaction "LPU64"\n",
1247                                tti->tti_transno);
1248                         RETURN(0);
1249                 }
1250                 /* we need another transno to be assigned */
1251                 tti->tti_transno = 0;
1252         } else if (th->th_result == 0) {
1253                 tti->tti_has_trans = 1;
1254         }
1255
1256         if (tsi->tsi_vbr_obj != NULL &&
1257             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu)) {
1258                 obj = tsi->tsi_vbr_obj;
1259         }
1260
1261         if (unlikely(echo_client)) /* echo client special case */
1262                 rc = tgt_last_rcvd_update_echo(env, tgt, obj, th,
1263                                                tsi->tsi_exp);
1264         else
1265                 rc = tgt_last_rcvd_update(env, tgt, obj, tsi->tsi_opdata, th,
1266                                           tgt_ses_req(tsi));
1267         return rc;
1268 }