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         strncpy(dcb->dcb_name, "tgt_cb_last_committed", MAX_COMMIT_CB_STR_LEN);
 457         dcb->dcb_name[MAX_COMMIT_CB_STR_LEN - 1] = '\0';
 458
 459         rc = dt_trans_cb_add(th, dcb);
 460         if (rc) {
 461                 class_export_cb_put(exp);
 462                 OBD_FREE_PTR(ccb);
 463         }
 464
 465         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 466                 /* report failure to force synchronous operation */
 467                 return -EPERM;
 468
 469         return rc;
 470 }
 471 EXPORT_SYMBOL(tgt_last_commit_cb_add);
 472
 473 struct tgt_new_client_callback {
 474         struct dt_txn_commit_cb  lncc_cb;
 475         struct obd_export       *lncc_exp;
 476 };
 477
 478 void tgt_cb_new_client(struct lu_env *env, struct thandle *th,
 479                        struct dt_txn_commit_cb *cb, int err)
 480 {
 481         struct tgt_new_client_callback *ccb;
 482
 483         ccb = container_of0(cb, struct tgt_new_client_callback, lncc_cb);
 484
 485         LASSERT(ccb->lncc_exp->exp_obd);
 486
 487         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 488                ccb->lncc_exp->exp_obd->obd_name,
 489                ccb->lncc_exp->exp_client_uuid.uuid);
 490
 491         spin_lock(&ccb->lncc_exp->exp_lock);
 492         /* XXX: Currently, we use per-export based sync/async policy for
 493          *      the update via OUT RPC, it is coarse-grained policy, and
 494          *      will be changed as per-request based by DNE II patches. */
 495         if (!ccb->lncc_exp->exp_keep_sync)
 496                 ccb->lncc_exp->exp_need_sync = 0;
 497
 498         spin_unlock(&ccb->lncc_exp->exp_lock);
 499         class_export_cb_put(ccb->lncc_exp);
 500
 501         OBD_FREE_PTR(ccb);
 502 }
 503
 504 int tgt_new_client_cb_add(struct thandle *th, struct obd_export *exp)
 505 {
 506         struct tgt_new_client_callback  *ccb;
 507         struct dt_txn_commit_cb         *dcb;
 508         int                              rc;
 509
 510         OBD_ALLOC_PTR(ccb);
 511         if (ccb == NULL)
 512                 return -ENOMEM;
 513
 514         ccb->lncc_exp = class_export_cb_get(exp);
 515
 516         dcb = &ccb->lncc_cb;
 517         dcb->dcb_func = tgt_cb_new_client;
 518         CFS_INIT_LIST_HEAD(&dcb->dcb_linkage);
 519         strncpy(dcb->dcb_name, "tgt_cb_new_client", MAX_COMMIT_CB_STR_LEN);
 520         dcb->dcb_name[MAX_COMMIT_CB_STR_LEN - 1] = '\0';
 521
 522         rc = dt_trans_cb_add(th, dcb);
 523         if (rc) {
 524                 class_export_cb_put(exp);
 525                 OBD_FREE_PTR(ccb);
 526         }
 527         return rc;
 528 }
 529
 530 /**
 531  * Add new client to the last_rcvd upon new connection.
 532  *
 533  * We use a bitmap to locate a free space in the last_rcvd file and initialize
 534  * tg_export_data.
 535  */
 536 int tgt_client_new(const struct lu_env *env, struct obd_export *exp)
 537 {
 538         struct tg_export_data   *ted = &exp->exp_target_data;
 539         struct lu_target        *tgt = class_exp2tgt(exp);
 540         int                      rc = 0, idx;
 541
 542         ENTRY;
 543
 544         LASSERT(tgt->lut_client_bitmap != NULL);
 545         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid))
 546                 RETURN(0);
 547
 548         mutex_init(&ted->ted_lcd_lock);
 549
 550         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 551                 RETURN(0);
 552
 553         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 554          * there's no need for extra complication here
 555          */
 556         idx = find_first_zero_bit(tgt->lut_client_bitmap, LR_MAX_CLIENTS);
 557 repeat:
 558         if (idx >= LR_MAX_CLIENTS ||
 559             OBD_FAIL_CHECK(OBD_FAIL_MDS_CLIENT_ADD)) {
 560                 CERROR("%s: no room for %u clients - fix LR_MAX_CLIENTS\n",
 561                        tgt->lut_obd->obd_name,  idx);
 562                 RETURN(-EOVERFLOW);
 563         }
 564         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 565                 idx = find_next_zero_bit(tgt->lut_client_bitmap,
 566                                              LR_MAX_CLIENTS, idx);
 567                 goto repeat;
 568         }
 569
 570         CDEBUG(D_INFO, "%s: client at idx %d with UUID '%s' added\n",
 571                tgt->lut_obd->obd_name, idx, ted->ted_lcd->lcd_uuid);
 572
 573         ted->ted_lr_idx = idx;
 574         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
 575                           idx * tgt->lut_lsd.lsd_client_size;
 576
 577         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 578
 579         CDEBUG(D_INFO, "%s: new client at index %d (%llu) with UUID '%s'\n",
 580                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
 581                ted->ted_lcd->lcd_uuid);
 582
 583         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_CLIENT_ADD))
 584                 RETURN(-ENOSPC);
 585
 586         rc = tgt_client_data_update(env, exp);
 587         if (rc)
 588                 CERROR("%s: Failed to write client lcd at idx %d, rc %d\n",
 589                        tgt->lut_obd->obd_name, idx, rc);
 590
 591         RETURN(rc);
 592 }
 593 EXPORT_SYMBOL(tgt_client_new);
 594
 595 /* Add client data to the MDS.  We use a bitmap to locate a free space
 596  * in the last_rcvd file if cl_off is -1 (i.e. a new client).
 597  * Otherwise, we just have to read the data from the last_rcvd file and
 598  * we know its offset.
 599  *
 600  * It should not be possible to fail adding an existing client - otherwise
 601  * mdt_init_server_data() callsite needs to be fixed.
 602  */
 603 int tgt_client_add(const struct lu_env *env,  struct obd_export *exp, int idx)
 604 {
 605         struct tg_export_data   *ted = &exp->exp_target_data;
 606         struct lu_target        *tgt = class_exp2tgt(exp);
 607
 608         ENTRY;
 609
 610         LASSERT(tgt->lut_client_bitmap != NULL);
 611         LASSERTF(idx >= 0, "%d\n", idx);
 612
 613         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid) ||
 614             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 615                 RETURN(0);
 616
 617         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 618                 CERROR("%s: client %d: bit already set in bitmap!!\n",
 619                        tgt->lut_obd->obd_name,  idx);
 620                 LBUG();
 621         }
 622
 623         CDEBUG(D_INFO, "%s: client at idx %d with UUID '%s' added\n",
 624                tgt->lut_obd->obd_name, idx, ted->ted_lcd->lcd_uuid);
 625
 626         ted->ted_lr_idx = idx;
 627         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
 628                           idx * tgt->lut_lsd.lsd_client_size;
 629
 630         mutex_init(&ted->ted_lcd_lock);
 631
 632         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 633
 634         RETURN(0);
 635 }
 636 EXPORT_SYMBOL(tgt_client_add);
 637
 638 int tgt_client_del(const struct lu_env *env, struct obd_export *exp)
 639 {
 640         struct tg_export_data   *ted = &exp->exp_target_data;
 641         struct lu_target        *tgt = class_exp2tgt(exp);
 642         int                      rc;
 643
 644         ENTRY;
 645
 646         LASSERT(ted->ted_lcd);
 647
 648         /* XXX if lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 649         if (!strcmp((char *)ted->ted_lcd->lcd_uuid,
 650                     (char *)tgt->lut_obd->obd_uuid.uuid) ||
 651             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 652                 RETURN(0);
 653
 654         CDEBUG(D_INFO, "%s: del client at idx %u, off %lld, UUID '%s'\n",
 655                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
 656                ted->ted_lcd->lcd_uuid);
 657
 658         /* Clear the bit _after_ zeroing out the client so we don't
 659            race with filter_client_add and zero out new clients.*/
 660         if (!test_bit(ted->ted_lr_idx, tgt->lut_client_bitmap)) {
 661                 CERROR("%s: client %u: bit already clear in bitmap!!\n",
 662                        tgt->lut_obd->obd_name, ted->ted_lr_idx);
 663                 LBUG();
 664         }
 665
 666         /* Do not erase record for recoverable client. */
 667         if (exp->exp_flags & OBD_OPT_FAILOVER)
 668                 RETURN(0);
 669
 670         /* Make sure the server's last_transno is up to date.
 671          * This should be done before zeroing client slot so last_transno will
 672          * be in server data or in client data in case of failure */
 673         rc = tgt_server_data_update(env, tgt, 0);
 674         if (rc != 0) {
 675                 CERROR("%s: failed to update server data, skip client %s "
 676                        "zeroing, rc %d\n", tgt->lut_obd->obd_name,
 677                        ted->ted_lcd->lcd_uuid, rc);
 678                 RETURN(rc);
 679         }
 680
 681         mutex_lock(&ted->ted_lcd_lock);
 682         memset(ted->ted_lcd->lcd_uuid, 0, sizeof ted->ted_lcd->lcd_uuid);
 683         rc = tgt_client_data_update(env, exp);
 684         mutex_unlock(&ted->ted_lcd_lock);
 685
 686         CDEBUG(rc == 0 ? D_INFO : D_ERROR,
 687                "%s: zeroing out client %s at idx %u (%llu), rc %d\n",
 688                tgt->lut_obd->obd_name, ted->ted_lcd->lcd_uuid,
 689                ted->ted_lr_idx, ted->ted_lr_off, rc);
 690         RETURN(rc);
 691 }
 692 EXPORT_SYMBOL(tgt_client_del);
 693
 694 /*
 695  * last_rcvd & last_committed update callbacks
 696  */
 697 int tgt_last_rcvd_update(const struct lu_env *env, struct lu_target *tgt,
 698                          struct dt_object *obj, __u64 opdata,
 699                          struct thandle *th, struct ptlrpc_request *req)
 700 {
 701         struct tgt_thread_info  *tti = tgt_th_info(env);
 702         struct tg_export_data   *ted;
 703         __u64                   *transno_p;
 704         int                      rc = 0;
 705         bool                     lw_client, update = false;
 706
 707         ENTRY;
 708
 709         ted = &req->rq_export->exp_target_data;
 710
 711         lw_client = exp_connect_flags(req->rq_export) & OBD_CONNECT_LIGHTWEIGHT;
 712         if (ted->ted_lr_idx < 0 && !lw_client)
 713                 /* ofd connect may cause transaction before export has
 714                  * last_rcvd slot */
 715                 RETURN(0);
 716
 717         tti->tti_transno = lustre_msg_get_transno(req->rq_reqmsg);
 718
 719         spin_lock(&tgt->lut_translock);
 720         if (th->th_result != 0) {
 721                 if (tti->tti_transno != 0) {
 722                         CERROR("%s: replay transno "LPU64" failed: rc = %d\n",
 723                                tgt_name(tgt), tti->tti_transno, th->th_result);
 724                 }
 725         } else if (tti->tti_transno == 0) {
 726                 tti->tti_transno = ++tgt->lut_last_transno;
 727         } else {
 728                 /* should be replay */
 729                 if (tti->tti_transno > tgt->lut_last_transno)
 730                         tgt->lut_last_transno = tti->tti_transno;
 731         }
 732         spin_unlock(&tgt->lut_translock);
 733
 734         /** VBR: set new versions */
 735         if (th->th_result == 0 && obj != NULL)
 736                 dt_version_set(env, obj, tti->tti_transno, th);
 737
 738         /* filling reply data */
 739         CDEBUG(D_INODE, "transno = "LPU64", last_committed = "LPU64"\n",
 740                tti->tti_transno, tgt->lut_obd->obd_last_committed);
 741
 742         req->rq_transno = tti->tti_transno;
 743         lustre_msg_set_transno(req->rq_repmsg, tti->tti_transno);
 744
 745         /* if can't add callback, do sync write */
 746         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, req->rq_export,
 747                                                 tti->tti_transno);
 748
 749         if (lw_client) {
 750                 /* All operations performed by LW clients are synchronous and
 751                  * we store the committed transno in the last_rcvd header */
 752                 spin_lock(&tgt->lut_translock);
 753                 if (tti->tti_transno > tgt->lut_lsd.lsd_last_transno) {
 754                         tgt->lut_lsd.lsd_last_transno = tti->tti_transno;
 755                         update = true;
 756                 }
 757                 spin_unlock(&tgt->lut_translock);
 758                 /* Although lightweight (LW) connections have no slot in
 759                  * last_rcvd, we still want to maintain the in-memory
 760                  * lsd_client_data structure in order to properly handle reply
 761                  * reconstruction. */
 762         } else if (ted->ted_lr_off == 0) {
 763                 CERROR("%s: client idx %d has offset %lld\n",
 764                        tgt_name(tgt), ted->ted_lr_idx, ted->ted_lr_off);
 765                 RETURN(-EINVAL);
 766         }
 767
 768         /* if the export has already been disconnected, we have no last_rcvd
 769          * slot, update server data with latest transno then */
 770         if (ted->ted_lcd == NULL) {
 771                 CWARN("commit transaction for disconnected client %s: rc %d\n",
 772                       req->rq_export->exp_client_uuid.uuid, rc);
 773                 GOTO(srv_update, rc = 0);
 774         }
 775
 776         mutex_lock(&ted->ted_lcd_lock);
 777         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
 778         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
 779             lustre_msg_get_opc(req->rq_reqmsg) == MDS_DONE_WRITING) {
 780                 transno_p = &ted->ted_lcd->lcd_last_close_transno;
 781                 ted->ted_lcd->lcd_last_close_xid = req->rq_xid;
 782                 ted->ted_lcd->lcd_last_close_result = th->th_result;
 783         } else {
 784                 /* VBR: save versions in last_rcvd for reconstruct. */
 785                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
 786
 787                 if (pre_versions) {
 788                         ted->ted_lcd->lcd_pre_versions[0] = pre_versions[0];
 789                         ted->ted_lcd->lcd_pre_versions[1] = pre_versions[1];
 790                         ted->ted_lcd->lcd_pre_versions[2] = pre_versions[2];
 791                         ted->ted_lcd->lcd_pre_versions[3] = pre_versions[3];
 792                 }
 793                 transno_p = &ted->ted_lcd->lcd_last_transno;
 794                 ted->ted_lcd->lcd_last_xid = req->rq_xid;
 795                 ted->ted_lcd->lcd_last_result = th->th_result;
 796                 /* XXX: lcd_last_data is __u32 but intent_dispostion is __u64,
 797                  * see struct ldlm_reply->lock_policy_res1; */
 798                 ted->ted_lcd->lcd_last_data = opdata;
 799         }
 800
 801         /* Update transno in slot only if non-zero number, i.e. no errors */
 802         if (likely(tti->tti_transno != 0)) {
 803                 if (*transno_p > tti->tti_transno &&
 804                     !tgt->lut_no_reconstruct) {
 805                         CERROR("%s: trying to overwrite bigger transno:"
 806                                "on-disk: "LPU64", new: "LPU64" replay: %d. "
 807                                "see LU-617.\n", tgt_name(tgt), *transno_p,
 808                                tti->tti_transno, req_is_replay(req));
 809                         if (req_is_replay(req)) {
 810                                 spin_lock(&req->rq_export->exp_lock);
 811                                 req->rq_export->exp_vbr_failed = 1;
 812                                 spin_unlock(&req->rq_export->exp_lock);
 813                         }
 814                         mutex_unlock(&ted->ted_lcd_lock);
 815                         RETURN(req_is_replay(req) ? -EOVERFLOW : 0);
 816                 }
 817                 *transno_p = tti->tti_transno;
 818         }
 819
 820         if (!lw_client) {
 821                 tti->tti_off = ted->ted_lr_off;
 822                 rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 823                 if (rc < 0) {
 824                         mutex_unlock(&ted->ted_lcd_lock);
 825                         RETURN(rc);
 826                 }
 827         }
 828         mutex_unlock(&ted->ted_lcd_lock);
 829         EXIT;
 830 srv_update:
 831         if (update)
 832                 rc = tgt_server_data_write(env, tgt, th);
 833         return rc;
 834 }
 835
 836 /*
 837  * last_rcvd update for echo client simulation.
 838  * It updates last_rcvd client slot and version of object in
 839  * simple way but with all locks to simulate all drawbacks
 840  */
 841 int tgt_last_rcvd_update_echo(const struct lu_env *env, struct lu_target *tgt,
 842                               struct dt_object *obj, struct thandle *th,
 843                               struct obd_export *exp)
 844 {
 845         struct tgt_thread_info  *tti = tgt_th_info(env);
 846         struct tg_export_data   *ted = &exp->exp_target_data;
 847         int                      rc = 0;
 848
 849         ENTRY;
 850
 851         tti->tti_transno = 0;
 852
 853         spin_lock(&tgt->lut_translock);
 854         if (th->th_result == 0)
 855                 tti->tti_transno = ++tgt->lut_last_transno;
 856         spin_unlock(&tgt->lut_translock);
 857
 858         /** VBR: set new versions */
 859         if (th->th_result == 0 && obj != NULL)
 860                 dt_version_set(env, obj, tti->tti_transno, th);
 861
 862         /* if can't add callback, do sync write */
 863         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, exp,
 864                                                 tti->tti_transno);
 865
 866         LASSERT(ted->ted_lr_off > 0);
 867
 868         mutex_lock(&ted->ted_lcd_lock);
 869         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
 870         ted->ted_lcd->lcd_last_transno = tti->tti_transno;
 871         ted->ted_lcd->lcd_last_result = th->th_result;
 872
 873         tti->tti_off = ted->ted_lr_off;
 874         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 875         mutex_unlock(&ted->ted_lcd_lock);
 876         RETURN(rc);
 877 }
 878
 879 int tgt_clients_data_init(const struct lu_env *env, struct lu_target *tgt,
 880                           unsigned long last_size)
 881 {
 882         struct obd_device       *obd = tgt->lut_obd;
 883         struct lr_server_data   *lsd = &tgt->lut_lsd;
 884         struct lsd_client_data  *lcd = NULL;
 885         struct tg_export_data   *ted;
 886         int                      cl_idx;
 887         int                      rc = 0;
 888         loff_t                   off = lsd->lsd_client_start;
 889
 890         ENTRY;
 891
 892         CLASSERT(offsetof(struct lsd_client_data, lcd_padding) +
 893                  sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
 894
 895         OBD_ALLOC_PTR(lcd);
 896         if (lcd == NULL)
 897                 RETURN(-ENOMEM);
 898
 899         for (cl_idx = 0; off < last_size; cl_idx++) {
 900                 struct obd_export       *exp;
 901                 __u64                    last_transno;
 902
 903                 /* Don't assume off is incremented properly by
 904                  * read_record(), in case sizeof(*lcd)
 905                  * isn't the same as fsd->lsd_client_size.  */
 906                 off = lsd->lsd_client_start + cl_idx * lsd->lsd_client_size;
 907                 rc = tgt_client_data_read(env, tgt, lcd, &off, cl_idx);
 908                 if (rc) {
 909                         CERROR("%s: error reading last_rcvd %s idx %d off "
 910                                "%llu: rc = %d\n", tgt_name(tgt), LAST_RCVD,
 911                                cl_idx, off, rc);
 912                         rc = 0;
 913                         break; /* read error shouldn't cause startup to fail */
 914                 }
 915
 916                 if (lcd->lcd_uuid[0] == '\0') {
 917                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
 918                                cl_idx);
 919                         continue;
 920                 }
 921
 922                 last_transno = lcd_last_transno(lcd);
 923
 924                 /* These exports are cleaned up by disconnect, so they
 925                  * need to be set up like real exports as connect does.
 926                  */
 927                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
 928                        " srv lr: "LPU64" lx: "LPU64"\n", lcd->lcd_uuid, cl_idx,
 929                        last_transno, lsd->lsd_last_transno, lcd_last_xid(lcd));
 930
 931                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
 932                 if (IS_ERR(exp)) {
 933                         if (PTR_ERR(exp) == -EALREADY) {
 934                                 /* export already exists, zero out this one */
 935                                 CERROR("%s: Duplicate export %s!\n",
 936                                        tgt_name(tgt), lcd->lcd_uuid);
 937                                 continue;
 938                         }
 939                         GOTO(err_out, rc = PTR_ERR(exp));
 940                 }
 941
 942                 ted = &exp->exp_target_data;
 943                 *ted->ted_lcd = *lcd;
 944
 945                 rc = tgt_client_add(env, exp, cl_idx);
 946                 LASSERTF(rc == 0, "rc = %d\n", rc); /* can't fail existing */
 947                 /* VBR: set export last committed version */
 948                 exp->exp_last_committed = last_transno;
 949                 spin_lock(&exp->exp_lock);
 950                 exp->exp_connecting = 0;
 951                 exp->exp_in_recovery = 0;
 952                 spin_unlock(&exp->exp_lock);
 953                 obd->obd_max_recoverable_clients++;
 954                 class_export_put(exp);
 955
 956                 /* Need to check last_rcvd even for duplicated exports. */
 957                 CDEBUG(D_OTHER, "client at idx %d has last_transno = "LPU64"\n",
 958                        cl_idx, last_transno);
 959
 960                 spin_lock(&tgt->lut_translock);
 961                 tgt->lut_last_transno = max(last_transno,
 962                                             tgt->lut_last_transno);
 963                 spin_unlock(&tgt->lut_translock);
 964         }
 965
 966 err_out:
 967         OBD_FREE_PTR(lcd);
 968         RETURN(rc);
 969 }
 970
 971 struct server_compat_data {
 972         __u32 rocompat;
 973         __u32 incompat;
 974         __u32 rocinit;
 975         __u32 incinit;
 976 };
 977
 978 static struct server_compat_data tgt_scd[] = {
 979         [LDD_F_SV_TYPE_MDT] = {
 980                 .rocompat = OBD_ROCOMPAT_LOVOBJID,
 981                 .incompat = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
 982                             OBD_INCOMPAT_FID | OBD_INCOMPAT_IAM_DIR |
 983                             OBD_INCOMPAT_LMM_VER | OBD_INCOMPAT_MULTI_OI,
 984                 .rocinit = OBD_ROCOMPAT_LOVOBJID,
 985                 .incinit = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
 986                            OBD_INCOMPAT_MULTI_OI,
 987         },
 988         [LDD_F_SV_TYPE_OST] = {
 989                 .rocompat = 0,
 990                 .incompat = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR |
 991                             OBD_INCOMPAT_FID,
 992                 .rocinit = 0,
 993                 .incinit = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR,
 994         }
 995 };
 996
 997 int tgt_server_data_init(const struct lu_env *env, struct lu_target *tgt)
 998 {
 999         struct tgt_thread_info          *tti = tgt_th_info(env);
1000         struct lr_server_data           *lsd = &tgt->lut_lsd;
1001         unsigned long                    last_rcvd_size;
1002         __u32                            index;
1003         int                              rc, type;
1004
1005         rc = dt_attr_get(env, tgt->lut_last_rcvd, &tti->tti_attr, BYPASS_CAPA);
1006         if (rc)
1007                 RETURN(rc);
1008
1009         last_rcvd_size = (unsigned long)tti->tti_attr.la_size;
1010
1011         /* ensure padding in the struct is the correct size */
1012         CLASSERT(offsetof(struct lr_server_data, lsd_padding) +
1013                  sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
1014
1015         rc = server_name2index(tgt_name(tgt), &index, NULL);
1016         if (rc < 0) {
1017                 CERROR("%s: Can not get index from name: rc = %d\n",
1018                        tgt_name(tgt), rc);
1019                 RETURN(rc);
1020         }
1021         /* server_name2index() returns type */
1022         type = rc;
1023         if (type != LDD_F_SV_TYPE_MDT && type != LDD_F_SV_TYPE_OST) {
1024                 CERROR("%s: unknown target type %x\n", tgt_name(tgt), type);
1025                 RETURN(-EINVAL);
1026         }
1027
1028         /* last_rcvd on OST doesn't provide reconstruct support because there
1029          * may be up to 8 in-flight write requests per single slot in
1030          * last_rcvd client data
1031          */
1032         tgt->lut_no_reconstruct = (type == LDD_F_SV_TYPE_OST);
1033
1034         if (last_rcvd_size == 0) {
1035                 LCONSOLE_WARN("%s: new disk, initializing\n", tgt_name(tgt));
1036
1037                 memcpy(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid,
1038                        sizeof(lsd->lsd_uuid));
1039                 lsd->lsd_last_transno = 0;
1040                 lsd->lsd_mount_count = 0;
1041                 lsd->lsd_server_size = LR_SERVER_SIZE;
1042                 lsd->lsd_client_start = LR_CLIENT_START;
1043                 lsd->lsd_client_size = LR_CLIENT_SIZE;
1044                 lsd->lsd_subdir_count = OBJ_SUBDIR_COUNT;
1045                 lsd->lsd_osd_index = index;
1046                 lsd->lsd_feature_rocompat = tgt_scd[type].rocinit;
1047                 lsd->lsd_feature_incompat = tgt_scd[type].incinit;
1048         } else {
1049                 rc = tgt_server_data_read(env, tgt);
1050                 if (rc) {
1051                         CERROR("%s: error reading LAST_RCVD: rc= %d\n",
1052                                tgt_name(tgt), rc);
1053                         RETURN(rc);
1054                 }
1055                 if (strcmp(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid)) {
1056                         LCONSOLE_ERROR_MSG(0x157, "Trying to start OBD %s "
1057                                            "using the wrong disk %s. Were the"
1058                                            " /dev/ assignments rearranged?\n",
1059                                            tgt->lut_obd->obd_uuid.uuid,
1060                                            lsd->lsd_uuid);
1061                         RETURN(-EINVAL);
1062                 }
1063
1064                 if (lsd->lsd_osd_index != index) {
1065                         LCONSOLE_ERROR_MSG(0x157, "%s: index %d in last rcvd "
1066                                            "is different with the index %d in"
1067                                            "config log, It might be disk"
1068                                            "corruption!\n", tgt_name(tgt),
1069                                            lsd->lsd_osd_index, index);
1070                         RETURN(-EINVAL);
1071                 }
1072         }
1073
1074         if (lsd->lsd_feature_incompat & ~tgt_scd[type].incompat) {
1075                 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
1076                        tgt_name(tgt),
1077                        lsd->lsd_feature_incompat & ~tgt_scd[type].incompat);
1078                 RETURN(-EINVAL);
1079         }
1080
1081         if (type == LDD_F_SV_TYPE_MDT)
1082                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
1083
1084         if (lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat) {
1085                 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
1086                        tgt_name(tgt),
1087                        lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat);
1088                 RETURN(-EINVAL);
1089         }
1090         /** Interop: evict all clients at first boot with 1.8 last_rcvd */
1091         if (type == LDD_F_SV_TYPE_MDT &&
1092             !(lsd->lsd_feature_compat & OBD_COMPAT_20)) {
1093                 if (last_rcvd_size > lsd->lsd_client_start) {
1094                         LCONSOLE_WARN("%s: mounting at first time on 1.8 FS, "
1095                                       "remove all clients for interop needs\n",
1096                                       tgt_name(tgt));
1097                         rc = tgt_truncate_last_rcvd(env, tgt,
1098                                                     lsd->lsd_client_start);
1099                         if (rc)
1100                                 RETURN(rc);
1101                         last_rcvd_size = lsd->lsd_client_start;
1102                 }
1103                 /** set 2.0 flag to upgrade/downgrade between 1.8 and 2.0 */
1104                 lsd->lsd_feature_compat |= OBD_COMPAT_20;
1105         }
1106
1107         spin_lock(&tgt->lut_translock);
1108         tgt->lut_last_transno = lsd->lsd_last_transno;
1109         spin_unlock(&tgt->lut_translock);
1110
1111         lsd->lsd_mount_count++;
1112
1113         CDEBUG(D_INODE, "=======,=BEGIN DUMPING LAST_RCVD========\n");
1114         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
1115                tgt_name(tgt), tgt->lut_last_transno);
1116         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
1117                tgt_name(tgt), lsd->lsd_mount_count);
1118         CDEBUG(D_INODE, "%s: server data size: %u\n",
1119                tgt_name(tgt), lsd->lsd_server_size);
1120         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
1121                tgt_name(tgt), lsd->lsd_client_start);
1122         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
1123                tgt_name(tgt), lsd->lsd_client_size);
1124         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
1125                tgt_name(tgt), last_rcvd_size);
1126         CDEBUG(D_INODE, "%s: server subdir_count: %u\n",
1127                tgt_name(tgt), lsd->lsd_subdir_count);
1128         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", tgt_name(tgt),
1129                last_rcvd_size <= lsd->lsd_client_start ? 0 :
1130                (last_rcvd_size - lsd->lsd_client_start) /
1131                 lsd->lsd_client_size);
1132         CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
1133
1134         if (lsd->lsd_server_size == 0 || lsd->lsd_client_start == 0 ||
1135             lsd->lsd_client_size == 0) {
1136                 CERROR("%s: bad last_rcvd contents!\n", tgt_name(tgt));
1137                 RETURN(-EINVAL);
1138         }
1139
1140         if (!tgt->lut_obd->obd_replayable)
1141                 CWARN("%s: recovery support OFF\n", tgt_name(tgt));
1142
1143         rc = tgt_clients_data_init(env, tgt, last_rcvd_size);
1144         if (rc < 0)
1145                 GOTO(err_client, rc);
1146
1147         spin_lock(&tgt->lut_translock);
1148         /* obd_last_committed is used for compatibility
1149          * with other lustre recovery code */
1150         tgt->lut_obd->obd_last_committed = tgt->lut_last_transno;
1151         spin_unlock(&tgt->lut_translock);
1152
1153         tgt->lut_obd->u.obt.obt_mount_count = lsd->lsd_mount_count;
1154         tgt->lut_obd->u.obt.obt_instance = (__u32)lsd->lsd_mount_count;
1155
1156         /* save it, so mount count and last_transno is current */
1157         rc = tgt_server_data_update(env, tgt, 0);
1158         if (rc < 0)
1159                 GOTO(err_client, rc);
1160
1161         RETURN(0);
1162
1163 err_client:
1164         class_disconnect_exports(tgt->lut_obd);
1165         return rc;
1166 }
1167
1168 /* add credits for last_rcvd update */
1169 int tgt_txn_start_cb(const struct lu_env *env, struct thandle *th,
1170                      void *cookie)
1171 {
1172         struct lu_target        *tgt = cookie;
1173         struct tgt_session_info *tsi;
1174         struct tgt_thread_info  *tti = tgt_th_info(env);
1175         int                      rc;
1176
1177         /* if there is no session, then this transaction is not result of
1178          * request processing but some local operation */
1179         if (env->le_ses == NULL)
1180                 return 0;
1181
1182         LASSERT(tgt->lut_last_rcvd);
1183         tsi = tgt_ses_info(env);
1184         /* OFD may start transaction without export assigned */
1185         if (tsi->tsi_exp == NULL)
1186                 return 0;
1187
1188         tti_buf_lcd(tti);
1189         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
1190                                      &tti->tti_buf,
1191                                      tsi->tsi_exp->exp_target_data.ted_lr_off,
1192                                      th);
1193         if (rc)
1194                 return rc;
1195
1196         tti_buf_lsd(tti);
1197         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
1198                                      &tti->tti_buf, 0, th);
1199         if (rc)
1200                 return rc;
1201
1202         if (tsi->tsi_vbr_obj != NULL &&
1203             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu))
1204                 rc = dt_declare_version_set(env, tsi->tsi_vbr_obj, th);
1205
1206         return rc;
1207 }
1208
1209 /* Update last_rcvd records with latests transaction data */
1210 int tgt_txn_stop_cb(const struct lu_env *env, struct thandle *th,
1211                     void *cookie)
1212 {
1213         struct lu_target        *tgt = cookie;
1214         struct tgt_session_info *tsi;
1215         struct tgt_thread_info  *tti = tgt_th_info(env);
1216         struct dt_object        *obj = NULL;
1217         int                      rc;
1218         bool                     echo_client;
1219
1220         if (env->le_ses == NULL)
1221                 return 0;
1222
1223         tsi = tgt_ses_info(env);
1224         /* OFD may start transaction without export assigned */
1225         if (tsi->tsi_exp == NULL)
1226                 return 0;
1227
1228         echo_client = (tgt_ses_req(tsi) == NULL);
1229
1230         if (tti->tti_has_trans && !echo_client) {
1231                 if (tti->tti_mult_trans == 0) {
1232                         CDEBUG(D_HA, "More than one transaction "LPU64"\n",
1233                                tti->tti_transno);
1234                         RETURN(0);
1235                 }
1236                 /* we need another transno to be assigned */
1237                 tti->tti_transno = 0;
1238         } else if (th->th_result == 0) {
1239                 tti->tti_has_trans = 1;
1240         }
1241
1242         if (tsi->tsi_vbr_obj != NULL &&
1243             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu)) {
1244                 obj = tsi->tsi_vbr_obj;
1245         }
1246
1247         if (unlikely(echo_client)) /* echo client special case */
1248                 rc = tgt_last_rcvd_update_echo(env, tgt, obj, th,
1249                                                tsi->tsi_exp);
1250         else
1251                 rc = tgt_last_rcvd_update(env, tgt, obj, tsi->tsi_opdata, th,
1252                                           tgt_ses_req(tsi));
1253         return rc;
1254 }