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, 2012, 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 int tgt_client_data_update(const struct lu_env *env, struct obd_export *exp)
 152 {
 153         struct tg_export_data   *ted = &exp->exp_target_data;
 154         struct lu_target        *tgt = class_exp2tgt(exp);
 155         struct tgt_thread_info  *tti = tgt_th_info(env);
 156         struct thandle          *th;
 157         int                      rc = 0;
 158
 159         ENTRY;
 160
 161         th = dt_trans_create(env, tgt->lut_bottom);
 162         if (IS_ERR(th))
 163                 RETURN(PTR_ERR(th));
 164
 165         tti_buf_lcd(tti);
 166         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
 167                                      &tti->tti_buf,
 168                                      ted->ted_lr_off, th);
 169         if (rc)
 170                 GOTO(out, rc);
 171
 172         rc = dt_trans_start_local(env, tgt->lut_bottom, th);
 173         if (rc)
 174                 GOTO(out, rc);
 175         /*
 176          * Until this operations will be committed the sync is needed
 177          * for this export. This should be done _after_ starting the
 178          * transaction so that many connecting clients will not bring
 179          * server down with lots of sync writes.
 180          */
 181         rc = tgt_new_client_cb_add(th, exp);
 182         if (rc) {
 183                 /* can't add callback, do sync now */
 184                 th->th_sync = 1;
 185         } else {
 186                 spin_lock(&exp->exp_lock);
 187                 exp->exp_need_sync = 1;
 188                 spin_unlock(&exp->exp_lock);
 189         }
 190
 191         tti->tti_off = ted->ted_lr_off;
 192         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 193         EXIT;
 194 out:
 195         dt_trans_stop(env, tgt->lut_bottom, th);
 196         CDEBUG(D_INFO, "%s: update last_rcvd client data for UUID = %s, "
 197                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 198                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 199
 200         return rc;
 201 }
 202
 203 int tgt_server_data_read(const struct lu_env *env, struct lu_target *tgt)
 204 {
 205         struct tgt_thread_info  *tti = tgt_th_info(env);
 206         int                      rc;
 207
 208         tti->tti_off = 0;
 209         tti_buf_lsd(tti);
 210         rc = dt_record_read(env, tgt->lut_last_rcvd, &tti->tti_buf,
 211                             &tti->tti_off);
 212         if (rc == 0)
 213                 lsd_le_to_cpu(&tti->tti_lsd, &tgt->lut_lsd);
 214
 215         CDEBUG(D_INFO, "%s: read last_rcvd server data for UUID = %s, "
 216                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 217                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 218         return rc;
 219 }
 220 EXPORT_SYMBOL(tgt_server_data_read);
 221
 222 int tgt_server_data_write(const struct lu_env *env, struct lu_target *tgt,
 223                           struct thandle *th)
 224 {
 225         struct tgt_thread_info  *tti = tgt_th_info(env);
 226         int                      rc;
 227
 228         ENTRY;
 229
 230         tti->tti_off = 0;
 231         tti_buf_lsd(tti);
 232         lsd_cpu_to_le(&tgt->lut_lsd, &tti->tti_lsd);
 233
 234         rc = dt_record_write(env, tgt->lut_last_rcvd, &tti->tti_buf,
 235                              &tti->tti_off, th);
 236
 237         CDEBUG(D_INFO, "%s: write last_rcvd server data for UUID = %s, "
 238                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 239                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 240
 241         RETURN(rc);
 242 }
 243 EXPORT_SYMBOL(tgt_server_data_write);
 244
 245 /**
 246  * Update server data in last_rcvd
 247  */
 248 int tgt_server_data_update(const struct lu_env *env, struct lu_target *tgt,
 249                            int sync)
 250 {
 251         struct tgt_thread_info  *tti = tgt_th_info(env);
 252         struct thandle          *th;
 253         int                      rc = 0;
 254
 255         ENTRY;
 256
 257         CDEBUG(D_SUPER,
 258                "%s: mount_count is "LPU64", last_transno is "LPU64"\n",
 259                tgt->lut_lsd.lsd_uuid, tgt->lut_obd->u.obt.obt_mount_count,
 260                tgt->lut_last_transno);
 261
 262         /* Always save latest transno to keep it fresh */
 263         spin_lock(&tgt->lut_translock);
 264         tgt->lut_lsd.lsd_last_transno = tgt->lut_last_transno;
 265         spin_unlock(&tgt->lut_translock);
 266
 267         th = dt_trans_create(env, tgt->lut_bottom);
 268         if (IS_ERR(th))
 269                 RETURN(PTR_ERR(th));
 270
 271         th->th_sync = sync;
 272
 273         tti_buf_lsd(tti);
 274         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
 275                                      &tti->tti_buf, tti->tti_off, th);
 276         if (rc)
 277                 GOTO(out, rc);
 278
 279         rc = dt_trans_start(env, tgt->lut_bottom, th);
 280         if (rc)
 281                 GOTO(out, rc);
 282
 283         rc = tgt_server_data_write(env, tgt, th);
 284 out:
 285         dt_trans_stop(env, tgt->lut_bottom, th);
 286
 287         CDEBUG(D_INFO, "%s: update last_rcvd server data for UUID = %s, "
 288                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 289                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 290         RETURN(rc);
 291 }
 292 EXPORT_SYMBOL(tgt_server_data_update);
 293
 294 int tgt_truncate_last_rcvd(const struct lu_env *env, struct lu_target *tgt,
 295                            loff_t size)
 296 {
 297         struct dt_object *dt = tgt->lut_last_rcvd;
 298         struct thandle   *th;
 299         struct lu_attr    attr;
 300         int               rc;
 301
 302         ENTRY;
 303
 304         attr.la_size = size;
 305         attr.la_valid = LA_SIZE;
 306
 307         th = dt_trans_create(env, tgt->lut_bottom);
 308         if (IS_ERR(th))
 309                 RETURN(PTR_ERR(th));
 310         rc = dt_declare_punch(env, dt, size, OBD_OBJECT_EOF, th);
 311         if (rc)
 312                 GOTO(cleanup, rc);
 313         rc = dt_declare_attr_set(env, dt, &attr, th);
 314         if (rc)
 315                 GOTO(cleanup, rc);
 316         rc = dt_trans_start_local(env, tgt->lut_bottom, th);
 317         if (rc)
 318                 GOTO(cleanup, rc);
 319
 320         rc = dt_punch(env, dt, size, OBD_OBJECT_EOF, th, BYPASS_CAPA);
 321         if (rc == 0)
 322                 rc = dt_attr_set(env, dt, &attr, th, BYPASS_CAPA);
 323
 324 cleanup:
 325         dt_trans_stop(env, tgt->lut_bottom, th);
 326
 327         RETURN(rc);
 328 }
 329 EXPORT_SYMBOL(tgt_truncate_last_rcvd);
 330
 331 void tgt_client_epoch_update(const struct lu_env *env, struct obd_export *exp)
 332 {
 333         struct lsd_client_data  *lcd = exp->exp_target_data.ted_lcd;
 334         struct lu_target        *tgt = class_exp2tgt(exp);
 335
 336         LASSERT(tgt->lut_bottom);
 337         /** VBR: set client last_epoch to current epoch */
 338         if (lcd->lcd_last_epoch >= tgt->lut_lsd.lsd_start_epoch)
 339                 return;
 340         lcd->lcd_last_epoch = tgt->lut_lsd.lsd_start_epoch;
 341         tgt_client_data_update(env, exp);
 342 }
 343
 344 /**
 345  * Update boot epoch when recovery ends
 346  */
 347 void tgt_boot_epoch_update(struct lu_target *tgt)
 348 {
 349         struct lu_env            env;
 350         struct ptlrpc_request   *req;
 351         __u32                    start_epoch;
 352         struct list_head         client_list;
 353         int                      rc;
 354
 355         if (tgt->lut_obd->obd_stopping)
 356                 return;
 357
 358         rc = lu_env_init(&env, LCT_DT_THREAD);
 359         if (rc) {
 360                 CERROR("%s: can't initialize environment: rc = %d\n",
 361                         tgt->lut_obd->obd_name, rc);
 362                 return;
 363         }
 364
 365         spin_lock(&tgt->lut_translock);
 366         start_epoch = lr_epoch(tgt->lut_last_transno) + 1;
 367         tgt->lut_last_transno = (__u64)start_epoch << LR_EPOCH_BITS;
 368         tgt->lut_lsd.lsd_start_epoch = start_epoch;
 369         spin_unlock(&tgt->lut_translock);
 370
 371         CFS_INIT_LIST_HEAD(&client_list);
 372         /**
 373          * The recovery is not yet finished and final queue can still be updated
 374          * with resend requests. Move final list to separate one for processing
 375          */
 376         spin_lock(&tgt->lut_obd->obd_recovery_task_lock);
 377         list_splice_init(&tgt->lut_obd->obd_final_req_queue, &client_list);
 378         spin_unlock(&tgt->lut_obd->obd_recovery_task_lock);
 379
 380         /**
 381          * go through list of exports participated in recovery and
 382          * set new epoch for them
 383          */
 384         list_for_each_entry(req, &client_list, rq_list) {
 385                 LASSERT(!req->rq_export->exp_delayed);
 386                 if (!req->rq_export->exp_vbr_failed)
 387                         tgt_client_epoch_update(&env, req->rq_export);
 388         }
 389         /** return list back at once */
 390         spin_lock(&tgt->lut_obd->obd_recovery_task_lock);
 391         list_splice_init(&client_list, &tgt->lut_obd->obd_final_req_queue);
 392         spin_unlock(&tgt->lut_obd->obd_recovery_task_lock);
 393         /** update server epoch */
 394         tgt_server_data_update(&env, tgt, 1);
 395         lu_env_fini(&env);
 396 }
 397 EXPORT_SYMBOL(tgt_boot_epoch_update);
 398
 399 /**
 400  * commit callback, need to update last_commited value
 401  */
 402 struct tgt_last_committed_callback {
 403         struct dt_txn_commit_cb  llcc_cb;
 404         struct lu_target        *llcc_tgt;
 405         struct obd_export       *llcc_exp;
 406         __u64                    llcc_transno;
 407 };
 408
 409 void tgt_cb_last_committed(struct lu_env *env, struct thandle *th,
 410                            struct dt_txn_commit_cb *cb, int err)
 411 {
 412         struct tgt_last_committed_callback *ccb;
 413
 414         ccb = container_of0(cb, struct tgt_last_committed_callback, llcc_cb);
 415
 416         LASSERT(ccb->llcc_tgt != NULL);
 417         LASSERT(ccb->llcc_exp->exp_obd == ccb->llcc_tgt->lut_obd);
 418
 419         spin_lock(&ccb->llcc_tgt->lut_translock);
 420         if (ccb->llcc_transno > ccb->llcc_tgt->lut_obd->obd_last_committed)
 421                 ccb->llcc_tgt->lut_obd->obd_last_committed = ccb->llcc_transno;
 422
 423         LASSERT(ccb->llcc_exp);
 424         if (ccb->llcc_transno > ccb->llcc_exp->exp_last_committed) {
 425                 ccb->llcc_exp->exp_last_committed = ccb->llcc_transno;
 426                 spin_unlock(&ccb->llcc_tgt->lut_translock);
 427                 ptlrpc_commit_replies(ccb->llcc_exp);
 428         } else {
 429                 spin_unlock(&ccb->llcc_tgt->lut_translock);
 430         }
 431         class_export_cb_put(ccb->llcc_exp);
 432         if (ccb->llcc_transno)
 433                 CDEBUG(D_HA, "%s: transno "LPD64" is committed\n",
 434                        ccb->llcc_tgt->lut_obd->obd_name, ccb->llcc_transno);
 435         OBD_FREE_PTR(ccb);
 436 }
 437
 438 int tgt_last_commit_cb_add(struct thandle *th, struct lu_target *tgt,
 439                            struct obd_export *exp, __u64 transno)
 440 {
 441         struct tgt_last_committed_callback      *ccb;
 442         struct dt_txn_commit_cb                 *dcb;
 443         int                                      rc;
 444
 445         OBD_ALLOC_PTR(ccb);
 446         if (ccb == NULL)
 447                 return -ENOMEM;
 448
 449         ccb->llcc_tgt = tgt;
 450         ccb->llcc_exp = class_export_cb_get(exp);
 451         ccb->llcc_transno = transno;
 452
 453         dcb = &ccb->llcc_cb;
 454         dcb->dcb_func = tgt_cb_last_committed;
 455         CFS_INIT_LIST_HEAD(&dcb->dcb_linkage);
 456         strlcpy(dcb->dcb_name, "tgt_cb_last_committed", sizeof(dcb->dcb_name));
 457
 458         rc = dt_trans_cb_add(th, dcb);
 459         if (rc) {
 460                 class_export_cb_put(exp);
 461                 OBD_FREE_PTR(ccb);
 462         }
 463
 464         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 465                 /* report failure to force synchronous operation */
 466                 return -EPERM;
 467
 468         return rc;
 469 }
 470 EXPORT_SYMBOL(tgt_last_commit_cb_add);
 471
 472 struct tgt_new_client_callback {
 473         struct dt_txn_commit_cb  lncc_cb;
 474         struct obd_export       *lncc_exp;
 475 };
 476
 477 void tgt_cb_new_client(struct lu_env *env, struct thandle *th,
 478                        struct dt_txn_commit_cb *cb, int err)
 479 {
 480         struct tgt_new_client_callback *ccb;
 481
 482         ccb = container_of0(cb, struct tgt_new_client_callback, lncc_cb);
 483
 484         LASSERT(ccb->lncc_exp->exp_obd);
 485
 486         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 487                ccb->lncc_exp->exp_obd->obd_name,
 488                ccb->lncc_exp->exp_client_uuid.uuid);
 489
 490         spin_lock(&ccb->lncc_exp->exp_lock);
 491         /* XXX: Currently, we use per-export based sync/async policy for
 492          *      the update via OUT RPC, it is coarse-grained policy, and
 493          *      will be changed as per-request based by DNE II patches. */
 494         if (!ccb->lncc_exp->exp_keep_sync)
 495                 ccb->lncc_exp->exp_need_sync = 0;
 496
 497         spin_unlock(&ccb->lncc_exp->exp_lock);
 498         class_export_cb_put(ccb->lncc_exp);
 499
 500         OBD_FREE_PTR(ccb);
 501 }
 502
 503 int tgt_new_client_cb_add(struct thandle *th, struct obd_export *exp)
 504 {
 505         struct tgt_new_client_callback  *ccb;
 506         struct dt_txn_commit_cb         *dcb;
 507         int                              rc;
 508
 509         OBD_ALLOC_PTR(ccb);
 510         if (ccb == NULL)
 511                 return -ENOMEM;
 512
 513         ccb->lncc_exp = class_export_cb_get(exp);
 514
 515         dcb = &ccb->lncc_cb;
 516         dcb->dcb_func = tgt_cb_new_client;
 517         CFS_INIT_LIST_HEAD(&dcb->dcb_linkage);
 518         strlcpy(dcb->dcb_name, "tgt_cb_new_client", sizeof(dcb->dcb_name));
 519
 520         rc = dt_trans_cb_add(th, dcb);
 521         if (rc) {
 522                 class_export_cb_put(exp);
 523                 OBD_FREE_PTR(ccb);
 524         }
 525         return rc;
 526 }
 527
 528 /**
 529  * Add new client to the last_rcvd upon new connection.
 530  *
 531  * We use a bitmap to locate a free space in the last_rcvd file and initialize
 532  * tg_export_data.
 533  */
 534 int tgt_client_new(const struct lu_env *env, struct obd_export *exp)
 535 {
 536         struct tg_export_data   *ted = &exp->exp_target_data;
 537         struct lu_target        *tgt = class_exp2tgt(exp);
 538         int                      rc = 0, idx;
 539
 540         ENTRY;
 541
 542         LASSERT(tgt->lut_client_bitmap != NULL);
 543         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid))
 544                 RETURN(0);
 545
 546         mutex_init(&ted->ted_lcd_lock);
 547
 548         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 549                 RETURN(0);
 550
 551         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 552          * there's no need for extra complication here
 553          */
 554         idx = find_first_zero_bit(tgt->lut_client_bitmap, LR_MAX_CLIENTS);
 555 repeat:
 556         if (idx >= LR_MAX_CLIENTS ||
 557             OBD_FAIL_CHECK(OBD_FAIL_MDS_CLIENT_ADD)) {
 558                 CERROR("%s: no room for %u clients - fix LR_MAX_CLIENTS\n",
 559                        tgt->lut_obd->obd_name,  idx);
 560                 RETURN(-EOVERFLOW);
 561         }
 562         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 563                 idx = find_next_zero_bit(tgt->lut_client_bitmap,
 564                                              LR_MAX_CLIENTS, idx);
 565                 goto repeat;
 566         }
 567
 568         CDEBUG(D_INFO, "%s: client at idx %d with UUID '%s' added\n",
 569                tgt->lut_obd->obd_name, idx, ted->ted_lcd->lcd_uuid);
 570
 571         ted->ted_lr_idx = idx;
 572         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
 573                           idx * tgt->lut_lsd.lsd_client_size;
 574
 575         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 576
 577         CDEBUG(D_INFO, "%s: new client at index %d (%llu) with UUID '%s'\n",
 578                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
 579                ted->ted_lcd->lcd_uuid);
 580
 581         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_CLIENT_ADD))
 582                 RETURN(-ENOSPC);
 583
 584         rc = tgt_client_data_update(env, exp);
 585         if (rc)
 586                 CERROR("%s: Failed to write client lcd at idx %d, rc %d\n",
 587                        tgt->lut_obd->obd_name, idx, rc);
 588
 589         RETURN(rc);
 590 }
 591 EXPORT_SYMBOL(tgt_client_new);
 592
 593 /* Add client data to the MDS.  We use a bitmap to locate a free space
 594  * in the last_rcvd file if cl_off is -1 (i.e. a new client).
 595  * Otherwise, we just have to read the data from the last_rcvd file and
 596  * we know its offset.
 597  *
 598  * It should not be possible to fail adding an existing client - otherwise
 599  * mdt_init_server_data() callsite needs to be fixed.
 600  */
 601 int tgt_client_add(const struct lu_env *env,  struct obd_export *exp, int idx)
 602 {
 603         struct tg_export_data   *ted = &exp->exp_target_data;
 604         struct lu_target        *tgt = class_exp2tgt(exp);
 605
 606         ENTRY;
 607
 608         LASSERT(tgt->lut_client_bitmap != NULL);
 609         LASSERTF(idx >= 0, "%d\n", idx);
 610
 611         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid) ||
 612             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 613                 RETURN(0);
 614
 615         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 616                 CERROR("%s: client %d: bit already set in bitmap!!\n",
 617                        tgt->lut_obd->obd_name,  idx);
 618                 LBUG();
 619         }
 620
 621         CDEBUG(D_INFO, "%s: client at idx %d with UUID '%s' added\n",
 622                tgt->lut_obd->obd_name, idx, ted->ted_lcd->lcd_uuid);
 623
 624         ted->ted_lr_idx = idx;
 625         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
 626                           idx * tgt->lut_lsd.lsd_client_size;
 627
 628         mutex_init(&ted->ted_lcd_lock);
 629
 630         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 631
 632         RETURN(0);
 633 }
 634 EXPORT_SYMBOL(tgt_client_add);
 635
 636 int tgt_client_del(const struct lu_env *env, struct obd_export *exp)
 637 {
 638         struct tg_export_data   *ted = &exp->exp_target_data;
 639         struct lu_target        *tgt = class_exp2tgt(exp);
 640         int                      rc;
 641
 642         ENTRY;
 643
 644         LASSERT(ted->ted_lcd);
 645
 646         /* XXX if lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 647         if (!strcmp((char *)ted->ted_lcd->lcd_uuid,
 648                     (char *)tgt->lut_obd->obd_uuid.uuid) ||
 649             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 650                 RETURN(0);
 651
 652         CDEBUG(D_INFO, "%s: del client at idx %u, off %lld, UUID '%s'\n",
 653                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
 654                ted->ted_lcd->lcd_uuid);
 655
 656         /* Clear the bit _after_ zeroing out the client so we don't
 657            race with filter_client_add and zero out new clients.*/
 658         if (!test_bit(ted->ted_lr_idx, tgt->lut_client_bitmap)) {
 659                 CERROR("%s: client %u: bit already clear in bitmap!!\n",
 660                        tgt->lut_obd->obd_name, ted->ted_lr_idx);
 661                 LBUG();
 662         }
 663
 664         /* Do not erase record for recoverable client. */
 665         if (exp->exp_flags & OBD_OPT_FAILOVER)
 666                 RETURN(0);
 667
 668         /* Make sure the server's last_transno is up to date.
 669          * This should be done before zeroing client slot so last_transno will
 670          * be in server data or in client data in case of failure */
 671         rc = tgt_server_data_update(env, tgt, 0);
 672         if (rc != 0) {
 673                 CERROR("%s: failed to update server data, skip client %s "
 674                        "zeroing, rc %d\n", tgt->lut_obd->obd_name,
 675                        ted->ted_lcd->lcd_uuid, rc);
 676                 RETURN(rc);
 677         }
 678
 679         mutex_lock(&ted->ted_lcd_lock);
 680         memset(ted->ted_lcd->lcd_uuid, 0, sizeof ted->ted_lcd->lcd_uuid);
 681         rc = tgt_client_data_update(env, exp);
 682         mutex_unlock(&ted->ted_lcd_lock);
 683
 684         CDEBUG(rc == 0 ? D_INFO : D_ERROR,
 685                "%s: zeroing out client %s at idx %u (%llu), rc %d\n",
 686                tgt->lut_obd->obd_name, ted->ted_lcd->lcd_uuid,
 687                ted->ted_lr_idx, ted->ted_lr_off, rc);
 688         RETURN(rc);
 689 }
 690 EXPORT_SYMBOL(tgt_client_del);
 691
 692 /*
 693  * last_rcvd & last_committed update callbacks
 694  */
 695 int tgt_last_rcvd_update(const struct lu_env *env, struct lu_target *tgt,
 696                          struct dt_object *obj, __u64 opdata,
 697                          struct thandle *th, struct ptlrpc_request *req)
 698 {
 699         struct tgt_thread_info  *tti = tgt_th_info(env);
 700         struct tg_export_data   *ted;
 701         __u64                   *transno_p;
 702         int                      rc = 0;
 703         bool                     lw_client, update = false;
 704
 705         ENTRY;
 706
 707         ted = &req->rq_export->exp_target_data;
 708
 709         lw_client = exp_connect_flags(req->rq_export) & OBD_CONNECT_LIGHTWEIGHT;
 710         if (ted->ted_lr_idx < 0 && !lw_client)
 711                 /* ofd connect may cause transaction before export has
 712                  * last_rcvd slot */
 713                 RETURN(0);
 714
 715         tti->tti_transno = lustre_msg_get_transno(req->rq_reqmsg);
 716
 717         spin_lock(&tgt->lut_translock);
 718         if (th->th_result != 0) {
 719                 if (tti->tti_transno != 0) {
 720                         CERROR("%s: replay transno "LPU64" failed: rc = %d\n",
 721                                tgt_name(tgt), tti->tti_transno, th->th_result);
 722                 }
 723         } else if (tti->tti_transno == 0) {
 724                 tti->tti_transno = ++tgt->lut_last_transno;
 725         } else {
 726                 /* should be replay */
 727                 if (tti->tti_transno > tgt->lut_last_transno)
 728                         tgt->lut_last_transno = tti->tti_transno;
 729         }
 730         spin_unlock(&tgt->lut_translock);
 731
 732         /** VBR: set new versions */
 733         if (th->th_result == 0 && obj != NULL)
 734                 dt_version_set(env, obj, tti->tti_transno, th);
 735
 736         /* filling reply data */
 737         CDEBUG(D_INODE, "transno = "LPU64", last_committed = "LPU64"\n",
 738                tti->tti_transno, tgt->lut_obd->obd_last_committed);
 739
 740         req->rq_transno = tti->tti_transno;
 741         lustre_msg_set_transno(req->rq_repmsg, tti->tti_transno);
 742
 743         /* if can't add callback, do sync write */
 744         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, req->rq_export,
 745                                                 tti->tti_transno);
 746
 747         if (lw_client) {
 748                 /* All operations performed by LW clients are synchronous and
 749                  * we store the committed transno in the last_rcvd header */
 750                 spin_lock(&tgt->lut_translock);
 751                 if (tti->tti_transno > tgt->lut_lsd.lsd_last_transno) {
 752                         tgt->lut_lsd.lsd_last_transno = tti->tti_transno;
 753                         update = true;
 754                 }
 755                 spin_unlock(&tgt->lut_translock);
 756                 /* Although lightweight (LW) connections have no slot in
 757                  * last_rcvd, we still want to maintain the in-memory
 758                  * lsd_client_data structure in order to properly handle reply
 759                  * reconstruction. */
 760         } else if (ted->ted_lr_off == 0) {
 761                 CERROR("%s: client idx %d has offset %lld\n",
 762                        tgt_name(tgt), ted->ted_lr_idx, ted->ted_lr_off);
 763                 RETURN(-EINVAL);
 764         }
 765
 766         /* if the export has already been disconnected, we have no last_rcvd
 767          * slot, update server data with latest transno then */
 768         if (ted->ted_lcd == NULL) {
 769                 CWARN("commit transaction for disconnected client %s: rc %d\n",
 770                       req->rq_export->exp_client_uuid.uuid, rc);
 771                 GOTO(srv_update, rc = 0);
 772         }
 773
 774         mutex_lock(&ted->ted_lcd_lock);
 775         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
 776         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
 777             lustre_msg_get_opc(req->rq_reqmsg) == MDS_DONE_WRITING) {
 778                 transno_p = &ted->ted_lcd->lcd_last_close_transno;
 779                 ted->ted_lcd->lcd_last_close_xid = req->rq_xid;
 780                 ted->ted_lcd->lcd_last_close_result = th->th_result;
 781         } else {
 782                 /* VBR: save versions in last_rcvd for reconstruct. */
 783                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
 784
 785                 if (pre_versions) {
 786                         ted->ted_lcd->lcd_pre_versions[0] = pre_versions[0];
 787                         ted->ted_lcd->lcd_pre_versions[1] = pre_versions[1];
 788                         ted->ted_lcd->lcd_pre_versions[2] = pre_versions[2];
 789                         ted->ted_lcd->lcd_pre_versions[3] = pre_versions[3];
 790                 }
 791                 transno_p = &ted->ted_lcd->lcd_last_transno;
 792                 ted->ted_lcd->lcd_last_xid = req->rq_xid;
 793                 ted->ted_lcd->lcd_last_result = th->th_result;
 794                 /* XXX: lcd_last_data is __u32 but intent_dispostion is __u64,
 795                  * see struct ldlm_reply->lock_policy_res1; */
 796                 ted->ted_lcd->lcd_last_data = opdata;
 797         }
 798
 799         /* Update transno in slot only if non-zero number, i.e. no errors */
 800         if (likely(tti->tti_transno != 0)) {
 801                 if (*transno_p > tti->tti_transno &&
 802                     !tgt->lut_no_reconstruct) {
 803                         CERROR("%s: trying to overwrite bigger transno:"
 804                                "on-disk: "LPU64", new: "LPU64" replay: %d. "
 805                                "see LU-617.\n", tgt_name(tgt), *transno_p,
 806                                tti->tti_transno, req_is_replay(req));
 807                         if (req_is_replay(req)) {
 808                                 spin_lock(&req->rq_export->exp_lock);
 809                                 req->rq_export->exp_vbr_failed = 1;
 810                                 spin_unlock(&req->rq_export->exp_lock);
 811                         }
 812                         mutex_unlock(&ted->ted_lcd_lock);
 813                         RETURN(req_is_replay(req) ? -EOVERFLOW : 0);
 814                 }
 815                 *transno_p = tti->tti_transno;
 816         }
 817
 818         if (!lw_client) {
 819                 tti->tti_off = ted->ted_lr_off;
 820                 rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 821                 if (rc < 0) {
 822                         mutex_unlock(&ted->ted_lcd_lock);
 823                         RETURN(rc);
 824                 }
 825         }
 826         mutex_unlock(&ted->ted_lcd_lock);
 827         EXIT;
 828 srv_update:
 829         if (update)
 830                 rc = tgt_server_data_write(env, tgt, th);
 831         return rc;
 832 }
 833
 834 /*
 835  * last_rcvd update for echo client simulation.
 836  * It updates last_rcvd client slot and version of object in
 837  * simple way but with all locks to simulate all drawbacks
 838  */
 839 int tgt_last_rcvd_update_echo(const struct lu_env *env, struct lu_target *tgt,
 840                               struct dt_object *obj, struct thandle *th,
 841                               struct obd_export *exp)
 842 {
 843         struct tgt_thread_info  *tti = tgt_th_info(env);
 844         struct tg_export_data   *ted = &exp->exp_target_data;
 845         int                      rc = 0;
 846
 847         ENTRY;
 848
 849         tti->tti_transno = 0;
 850
 851         spin_lock(&tgt->lut_translock);
 852         if (th->th_result == 0)
 853                 tti->tti_transno = ++tgt->lut_last_transno;
 854         spin_unlock(&tgt->lut_translock);
 855
 856         /** VBR: set new versions */
 857         if (th->th_result == 0 && obj != NULL)
 858                 dt_version_set(env, obj, tti->tti_transno, th);
 859
 860         /* if can't add callback, do sync write */
 861         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, exp,
 862                                                 tti->tti_transno);
 863
 864         LASSERT(ted->ted_lr_off > 0);
 865
 866         mutex_lock(&ted->ted_lcd_lock);
 867         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
 868         ted->ted_lcd->lcd_last_transno = tti->tti_transno;
 869         ted->ted_lcd->lcd_last_result = th->th_result;
 870
 871         tti->tti_off = ted->ted_lr_off;
 872         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 873         mutex_unlock(&ted->ted_lcd_lock);
 874         RETURN(rc);
 875 }
 876
 877 int tgt_clients_data_init(const struct lu_env *env, struct lu_target *tgt,
 878                           unsigned long last_size)
 879 {
 880         struct obd_device       *obd = tgt->lut_obd;
 881         struct lr_server_data   *lsd = &tgt->lut_lsd;
 882         struct lsd_client_data  *lcd = NULL;
 883         struct tg_export_data   *ted;
 884         int                      cl_idx;
 885         int                      rc = 0;
 886         loff_t                   off = lsd->lsd_client_start;
 887
 888         ENTRY;
 889
 890         CLASSERT(offsetof(struct lsd_client_data, lcd_padding) +
 891                  sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
 892
 893         OBD_ALLOC_PTR(lcd);
 894         if (lcd == NULL)
 895                 RETURN(-ENOMEM);
 896
 897         for (cl_idx = 0; off < last_size; cl_idx++) {
 898                 struct obd_export       *exp;
 899                 __u64                    last_transno;
 900
 901                 /* Don't assume off is incremented properly by
 902                  * read_record(), in case sizeof(*lcd)
 903                  * isn't the same as fsd->lsd_client_size.  */
 904                 off = lsd->lsd_client_start + cl_idx * lsd->lsd_client_size;
 905                 rc = tgt_client_data_read(env, tgt, lcd, &off, cl_idx);
 906                 if (rc) {
 907                         CERROR("%s: error reading last_rcvd %s idx %d off "
 908                                "%llu: rc = %d\n", tgt_name(tgt), LAST_RCVD,
 909                                cl_idx, off, rc);
 910                         rc = 0;
 911                         break; /* read error shouldn't cause startup to fail */
 912                 }
 913
 914                 if (lcd->lcd_uuid[0] == '\0') {
 915                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
 916                                cl_idx);
 917                         continue;
 918                 }
 919
 920                 last_transno = lcd_last_transno(lcd);
 921
 922                 /* These exports are cleaned up by disconnect, so they
 923                  * need to be set up like real exports as connect does.
 924                  */
 925                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
 926                        " srv lr: "LPU64" lx: "LPU64"\n", lcd->lcd_uuid, cl_idx,
 927                        last_transno, lsd->lsd_last_transno, lcd_last_xid(lcd));
 928
 929                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
 930                 if (IS_ERR(exp)) {
 931                         if (PTR_ERR(exp) == -EALREADY) {
 932                                 /* export already exists, zero out this one */
 933                                 CERROR("%s: Duplicate export %s!\n",
 934                                        tgt_name(tgt), lcd->lcd_uuid);
 935                                 continue;
 936                         }
 937                         GOTO(err_out, rc = PTR_ERR(exp));
 938                 }
 939
 940                 ted = &exp->exp_target_data;
 941                 *ted->ted_lcd = *lcd;
 942
 943                 rc = tgt_client_add(env, exp, cl_idx);
 944                 LASSERTF(rc == 0, "rc = %d\n", rc); /* can't fail existing */
 945                 /* VBR: set export last committed version */
 946                 exp->exp_last_committed = last_transno;
 947                 spin_lock(&exp->exp_lock);
 948                 exp->exp_connecting = 0;
 949                 exp->exp_in_recovery = 0;
 950                 spin_unlock(&exp->exp_lock);
 951                 obd->obd_max_recoverable_clients++;
 952                 class_export_put(exp);
 953
 954                 /* Need to check last_rcvd even for duplicated exports. */
 955                 CDEBUG(D_OTHER, "client at idx %d has last_transno = "LPU64"\n",
 956                        cl_idx, last_transno);
 957
 958                 spin_lock(&tgt->lut_translock);
 959                 tgt->lut_last_transno = max(last_transno,
 960                                             tgt->lut_last_transno);
 961                 spin_unlock(&tgt->lut_translock);
 962         }
 963
 964 err_out:
 965         OBD_FREE_PTR(lcd);
 966         RETURN(rc);
 967 }
 968
 969 struct server_compat_data {
 970         __u32 rocompat;
 971         __u32 incompat;
 972         __u32 rocinit;
 973         __u32 incinit;
 974 };
 975
 976 static struct server_compat_data tgt_scd[] = {
 977         [LDD_F_SV_TYPE_MDT] = {
 978                 .rocompat = OBD_ROCOMPAT_LOVOBJID,
 979                 .incompat = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
 980                             OBD_INCOMPAT_FID | OBD_INCOMPAT_IAM_DIR |
 981                             OBD_INCOMPAT_LMM_VER | OBD_INCOMPAT_MULTI_OI,
 982                 .rocinit = OBD_ROCOMPAT_LOVOBJID,
 983                 .incinit = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
 984                            OBD_INCOMPAT_MULTI_OI,
 985         },
 986         [LDD_F_SV_TYPE_OST] = {
 987                 .rocompat = 0,
 988                 .incompat = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR |
 989                             OBD_INCOMPAT_FID,
 990                 .rocinit = 0,
 991                 .incinit = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR,
 992         }
 993 };
 994
 995 int tgt_server_data_init(const struct lu_env *env, struct lu_target *tgt)
 996 {
 997         struct tgt_thread_info          *tti = tgt_th_info(env);
 998         struct lr_server_data           *lsd = &tgt->lut_lsd;
 999         unsigned long                    last_rcvd_size;
1000         __u32                            index;
1001         int                              rc, type;
1002
1003         rc = dt_attr_get(env, tgt->lut_last_rcvd, &tti->tti_attr, BYPASS_CAPA);
1004         if (rc)
1005                 RETURN(rc);
1006
1007         last_rcvd_size = (unsigned long)tti->tti_attr.la_size;
1008
1009         /* ensure padding in the struct is the correct size */
1010         CLASSERT(offsetof(struct lr_server_data, lsd_padding) +
1011                  sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
1012
1013         rc = server_name2index(tgt_name(tgt), &index, NULL);
1014         if (rc < 0) {
1015                 CERROR("%s: Can not get index from name: rc = %d\n",
1016                        tgt_name(tgt), rc);
1017                 RETURN(rc);
1018         }
1019         /* server_name2index() returns type */
1020         type = rc;
1021         if (type != LDD_F_SV_TYPE_MDT && type != LDD_F_SV_TYPE_OST) {
1022                 CERROR("%s: unknown target type %x\n", tgt_name(tgt), type);
1023                 RETURN(-EINVAL);
1024         }
1025
1026         /* last_rcvd on OST doesn't provide reconstruct support because there
1027          * may be up to 8 in-flight write requests per single slot in
1028          * last_rcvd client data
1029          */
1030         tgt->lut_no_reconstruct = (type == LDD_F_SV_TYPE_OST);
1031
1032         if (last_rcvd_size == 0) {
1033                 LCONSOLE_WARN("%s: new disk, initializing\n", tgt_name(tgt));
1034
1035                 memcpy(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid,
1036                        sizeof(lsd->lsd_uuid));
1037                 lsd->lsd_last_transno = 0;
1038                 lsd->lsd_mount_count = 0;
1039                 lsd->lsd_server_size = LR_SERVER_SIZE;
1040                 lsd->lsd_client_start = LR_CLIENT_START;
1041                 lsd->lsd_client_size = LR_CLIENT_SIZE;
1042                 lsd->lsd_subdir_count = OBJ_SUBDIR_COUNT;
1043                 lsd->lsd_osd_index = index;
1044                 lsd->lsd_feature_rocompat = tgt_scd[type].rocinit;
1045                 lsd->lsd_feature_incompat = tgt_scd[type].incinit;
1046         } else {
1047                 rc = tgt_server_data_read(env, tgt);
1048                 if (rc) {
1049                         CERROR("%s: error reading LAST_RCVD: rc= %d\n",
1050                                tgt_name(tgt), rc);
1051                         RETURN(rc);
1052                 }
1053                 if (strcmp(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid)) {
1054                         LCONSOLE_ERROR_MSG(0x157, "Trying to start OBD %s "
1055                                            "using the wrong disk %s. Were the"
1056                                            " /dev/ assignments rearranged?\n",
1057                                            tgt->lut_obd->obd_uuid.uuid,
1058                                            lsd->lsd_uuid);
1059                         RETURN(-EINVAL);
1060                 }
1061
1062                 if (lsd->lsd_osd_index != index) {
1063                         LCONSOLE_ERROR_MSG(0x157, "%s: index %d in last rcvd "
1064                                            "is different with the index %d in"
1065                                            "config log, It might be disk"
1066                                            "corruption!\n", tgt_name(tgt),
1067                                            lsd->lsd_osd_index, index);
1068                         RETURN(-EINVAL);
1069                 }
1070         }
1071
1072         if (lsd->lsd_feature_incompat & ~tgt_scd[type].incompat) {
1073                 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
1074                        tgt_name(tgt),
1075                        lsd->lsd_feature_incompat & ~tgt_scd[type].incompat);
1076                 RETURN(-EINVAL);
1077         }
1078
1079         if (type == LDD_F_SV_TYPE_MDT)
1080                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
1081
1082         if (lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat) {
1083                 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
1084                        tgt_name(tgt),
1085                        lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat);
1086                 RETURN(-EINVAL);
1087         }
1088         /** Interop: evict all clients at first boot with 1.8 last_rcvd */
1089         if (type == LDD_F_SV_TYPE_MDT &&
1090             !(lsd->lsd_feature_compat & OBD_COMPAT_20)) {
1091                 if (last_rcvd_size > lsd->lsd_client_start) {
1092                         LCONSOLE_WARN("%s: mounting at first time on 1.8 FS, "
1093                                       "remove all clients for interop needs\n",
1094                                       tgt_name(tgt));
1095                         rc = tgt_truncate_last_rcvd(env, tgt,
1096                                                     lsd->lsd_client_start);
1097                         if (rc)
1098                                 RETURN(rc);
1099                         last_rcvd_size = lsd->lsd_client_start;
1100                 }
1101                 /** set 2.0 flag to upgrade/downgrade between 1.8 and 2.0 */
1102                 lsd->lsd_feature_compat |= OBD_COMPAT_20;
1103         }
1104
1105         spin_lock(&tgt->lut_translock);
1106         tgt->lut_last_transno = lsd->lsd_last_transno;
1107         spin_unlock(&tgt->lut_translock);
1108
1109         lsd->lsd_mount_count++;
1110
1111         CDEBUG(D_INODE, "=======,=BEGIN DUMPING LAST_RCVD========\n");
1112         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
1113                tgt_name(tgt), tgt->lut_last_transno);
1114         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
1115                tgt_name(tgt), lsd->lsd_mount_count);
1116         CDEBUG(D_INODE, "%s: server data size: %u\n",
1117                tgt_name(tgt), lsd->lsd_server_size);
1118         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
1119                tgt_name(tgt), lsd->lsd_client_start);
1120         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
1121                tgt_name(tgt), lsd->lsd_client_size);
1122         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
1123                tgt_name(tgt), last_rcvd_size);
1124         CDEBUG(D_INODE, "%s: server subdir_count: %u\n",
1125                tgt_name(tgt), lsd->lsd_subdir_count);
1126         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", tgt_name(tgt),
1127                last_rcvd_size <= lsd->lsd_client_start ? 0 :
1128                (last_rcvd_size - lsd->lsd_client_start) /
1129                 lsd->lsd_client_size);
1130         CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
1131
1132         if (lsd->lsd_server_size == 0 || lsd->lsd_client_start == 0 ||
1133             lsd->lsd_client_size == 0) {
1134                 CERROR("%s: bad last_rcvd contents!\n", tgt_name(tgt));
1135                 RETURN(-EINVAL);
1136         }
1137
1138         if (!tgt->lut_obd->obd_replayable)
1139                 CWARN("%s: recovery support OFF\n", tgt_name(tgt));
1140
1141         rc = tgt_clients_data_init(env, tgt, last_rcvd_size);
1142         if (rc < 0)
1143                 GOTO(err_client, rc);
1144
1145         spin_lock(&tgt->lut_translock);
1146         /* obd_last_committed is used for compatibility
1147          * with other lustre recovery code */
1148         tgt->lut_obd->obd_last_committed = tgt->lut_last_transno;
1149         spin_unlock(&tgt->lut_translock);
1150
1151         tgt->lut_obd->u.obt.obt_mount_count = lsd->lsd_mount_count;
1152         tgt->lut_obd->u.obt.obt_instance = (__u32)lsd->lsd_mount_count;
1153
1154         /* save it, so mount count and last_transno is current */
1155         rc = tgt_server_data_update(env, tgt, 0);
1156         if (rc < 0)
1157                 GOTO(err_client, rc);
1158
1159         RETURN(0);
1160
1161 err_client:
1162         class_disconnect_exports(tgt->lut_obd);
1163         return rc;
1164 }
1165
1166 /* add credits for last_rcvd update */
1167 int tgt_txn_start_cb(const struct lu_env *env, struct thandle *th,
1168                      void *cookie)
1169 {
1170         struct lu_target        *tgt = cookie;
1171         struct tgt_session_info *tsi;
1172         struct tgt_thread_info  *tti = tgt_th_info(env);
1173         int                      rc;
1174
1175         /* if there is no session, then this transaction is not result of
1176          * request processing but some local operation */
1177         if (env->le_ses == NULL)
1178                 return 0;
1179
1180         LASSERT(tgt->lut_last_rcvd);
1181         tsi = tgt_ses_info(env);
1182         /* OFD may start transaction without export assigned */
1183         if (tsi->tsi_exp == NULL)
1184                 return 0;
1185
1186         tti_buf_lcd(tti);
1187         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
1188                                      &tti->tti_buf,
1189                                      tsi->tsi_exp->exp_target_data.ted_lr_off,
1190                                      th);
1191         if (rc)
1192                 return rc;
1193
1194         tti_buf_lsd(tti);
1195         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
1196                                      &tti->tti_buf, 0, th);
1197         if (rc)
1198                 return rc;
1199
1200         if (tsi->tsi_vbr_obj != NULL &&
1201             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu))
1202                 rc = dt_declare_version_set(env, tsi->tsi_vbr_obj, th);
1203
1204         return rc;
1205 }
1206
1207 /* Update last_rcvd records with latests transaction data */
1208 int tgt_txn_stop_cb(const struct lu_env *env, struct thandle *th,
1209                     void *cookie)
1210 {
1211         struct lu_target        *tgt = cookie;
1212         struct tgt_session_info *tsi;
1213         struct tgt_thread_info  *tti = tgt_th_info(env);
1214         struct dt_object        *obj = NULL;
1215         int                      rc;
1216         bool                     echo_client;
1217
1218         if (env->le_ses == NULL)
1219                 return 0;
1220
1221         tsi = tgt_ses_info(env);
1222         /* OFD may start transaction without export assigned */
1223         if (tsi->tsi_exp == NULL)
1224                 return 0;
1225
1226         echo_client = (tgt_ses_req(tsi) == NULL);
1227
1228         if (tti->tti_has_trans && !echo_client) {
1229                 if (tti->tti_mult_trans == 0) {
1230                         CDEBUG(D_HA, "More than one transaction "LPU64"\n",
1231                                tti->tti_transno);
1232                         RETURN(0);
1233                 }
1234                 /* we need another transno to be assigned */
1235                 tti->tti_transno = 0;
1236         } else if (th->th_result == 0) {
1237                 tti->tti_has_trans = 1;
1238         }
1239
1240         if (tsi->tsi_vbr_obj != NULL &&
1241             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu)) {
1242                 obj = tsi->tsi_vbr_obj;
1243         }
1244
1245         if (unlikely(echo_client)) /* echo client special case */
1246                 rc = tgt_last_rcvd_update_echo(env, tgt, obj, th,
1247                                                tsi->tsi_exp);
1248         else
1249                 rc = tgt_last_rcvd_update(env, tgt, obj, tsi->tsi_opdata, th,
1250                                           tgt_ses_req(tsi));
1251         return rc;
1252 }