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, 2015, 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
  48 /* Allocate a bitmap for a chunk of reply data slots */
  49 static int tgt_bitmap_chunk_alloc(struct lu_target *lut, int chunk)
  50 {
  51         unsigned long *bm;
  52
  53         OBD_ALLOC(bm, BITS_TO_LONGS(LUT_REPLY_SLOTS_PER_CHUNK) * sizeof(long));
  54         if (bm == NULL)
  55                 return -ENOMEM;
  56
  57         spin_lock(&lut->lut_client_bitmap_lock);
  58
  59         if (lut->lut_reply_bitmap[chunk] != NULL) {
  60                 /* someone else already allocated the bitmap for this chunk */
  61                 spin_unlock(&lut->lut_client_bitmap_lock);
  62                 OBD_FREE(bm, BITS_TO_LONGS(LUT_REPLY_SLOTS_PER_CHUNK) *
  63                          sizeof(long));
  64                 return 0;
  65         }
  66
  67         lut->lut_reply_bitmap[chunk] = bm;
  68
  69         spin_unlock(&lut->lut_client_bitmap_lock);
  70
  71         return 0;
  72 }
  73
  74 /* Look for an available reply data slot in the bitmap
  75  * of the target @lut
  76  * Allocate bitmap chunk when first used
  77  * XXX algo could be improved if this routine limits performance
  78  */
  79 static int tgt_find_free_reply_slot(struct lu_target *lut)
  80 {
  81         unsigned long *bmp;
  82         int chunk = 0;
  83         int rc;
  84         int b;
  85
  86         for (chunk = 0; chunk < LUT_REPLY_SLOTS_MAX_CHUNKS; chunk++) {
  87                 /* allocate the bitmap chunk if necessary */
  88                 if (unlikely(lut->lut_reply_bitmap[chunk] == NULL)) {
  89                         rc = tgt_bitmap_chunk_alloc(lut, chunk);
  90                         if (rc != 0)
  91                                 return rc;
  92                 }
  93                 bmp = lut->lut_reply_bitmap[chunk];
  94
  95                 /* look for an available slot in this chunk */
  96                 do {
  97                         b = find_first_zero_bit(bmp, LUT_REPLY_SLOTS_PER_CHUNK);
  98                         if (b >= LUT_REPLY_SLOTS_PER_CHUNK)
  99                                 break;
 100
 101                         /* found one */
 102                         if (test_and_set_bit(b, bmp) == 0)
 103                                 return chunk * LUT_REPLY_SLOTS_PER_CHUNK + b;
 104                 } while (true);
 105         }
 106
 107         return -ENOSPC;
 108 }
 109
 110 /* Mark the reply data slot @idx 'used' in the corresponding bitmap chunk
 111  * of the target @lut
 112  * Allocate the bitmap chunk if necessary
 113  */
 114 static int tgt_set_reply_slot(struct lu_target *lut, int idx)
 115 {
 116         int chunk;
 117         int b;
 118         int rc;
 119
 120         chunk = idx / LUT_REPLY_SLOTS_PER_CHUNK;
 121         b = idx % LUT_REPLY_SLOTS_PER_CHUNK;
 122
 123         LASSERT(chunk < LUT_REPLY_SLOTS_MAX_CHUNKS);
 124         LASSERT(b < LUT_REPLY_SLOTS_PER_CHUNK);
 125
 126         /* allocate the bitmap chunk if necessary */
 127         if (unlikely(lut->lut_reply_bitmap[chunk] == NULL)) {
 128                 rc = tgt_bitmap_chunk_alloc(lut, chunk);
 129                 if (rc != 0)
 130                         return rc;
 131         }
 132
 133         /* mark the slot 'used' in this chunk */
 134         if (test_and_set_bit(b, lut->lut_reply_bitmap[chunk]) != 0) {
 135                 CERROR("%s: slot %d already set in bitmap\n",
 136                        tgt_name(lut), idx);
 137                 return -EALREADY;
 138         }
 139
 140         return 0;
 141 }
 142
 143
 144 /* Mark the reply data slot @idx 'unused' in the corresponding bitmap chunk
 145  * of the target @lut
 146  */
 147 static int tgt_clear_reply_slot(struct lu_target *lut, int idx)
 148 {
 149         int chunk;
 150         int b;
 151
 152         chunk = idx / LUT_REPLY_SLOTS_PER_CHUNK;
 153         b = idx % LUT_REPLY_SLOTS_PER_CHUNK;
 154
 155         LASSERT(chunk < LUT_REPLY_SLOTS_MAX_CHUNKS);
 156         LASSERT(b < LUT_REPLY_SLOTS_PER_CHUNK);
 157
 158         if (test_and_clear_bit(b, lut->lut_reply_bitmap[chunk]) == 0) {
 159                 CERROR("%s: slot %d already clear in bitmap\n",
 160                        tgt_name(lut), idx);
 161                 return -EALREADY;
 162         }
 163
 164         return 0;
 165 }
 166
 167
 168 /* Read header of reply_data file of target @tgt into structure @lrh */
 169 static int tgt_reply_header_read(const struct lu_env *env,
 170                                  struct lu_target *tgt,
 171                                  struct lsd_reply_header *lrh)
 172 {
 173         int                      rc;
 174         struct lsd_reply_header  buf;
 175         struct tgt_thread_info  *tti = tgt_th_info(env);
 176
 177         tti->tti_off = 0;
 178         tti->tti_buf.lb_buf = &buf;
 179         tti->tti_buf.lb_len = sizeof(buf);
 180
 181         rc = dt_record_read(env, tgt->lut_reply_data, &tti->tti_buf,
 182                             &tti->tti_off);
 183         if (rc != 0)
 184                 return rc;
 185
 186         lrh->lrh_magic = le32_to_cpu(buf.lrh_magic);
 187         lrh->lrh_header_size = le32_to_cpu(buf.lrh_header_size);
 188         lrh->lrh_reply_size = le32_to_cpu(buf.lrh_reply_size);
 189
 190         CDEBUG(D_HA, "%s: read %s header. magic=0x%08x "
 191                "header_size=%d reply_size=%d\n",
 192                 tgt->lut_obd->obd_name, REPLY_DATA,
 193                 lrh->lrh_magic, lrh->lrh_header_size, lrh->lrh_reply_size);
 194
 195         return 0;
 196 }
 197
 198 /* Write header into replay_data file of target @tgt from structure @lrh */
 199 static int tgt_reply_header_write(const struct lu_env *env,
 200                                   struct lu_target *tgt,
 201                                   struct lsd_reply_header *lrh)
 202 {
 203         int                      rc;
 204         struct lsd_reply_header  buf;
 205         struct tgt_thread_info  *tti = tgt_th_info(env);
 206         struct thandle          *th;
 207         struct dt_object        *dto;
 208
 209         CDEBUG(D_HA, "%s: write %s header. magic=0x%08x "
 210                "header_size=%d reply_size=%d\n",
 211                 tgt->lut_obd->obd_name, REPLY_DATA,
 212                 lrh->lrh_magic, lrh->lrh_header_size, lrh->lrh_reply_size);
 213
 214         buf.lrh_magic = cpu_to_le32(lrh->lrh_magic);
 215         buf.lrh_header_size = cpu_to_le32(lrh->lrh_header_size);
 216         buf.lrh_reply_size = cpu_to_le32(lrh->lrh_reply_size);
 217
 218         th = dt_trans_create(env, tgt->lut_bottom);
 219         if (IS_ERR(th))
 220                 return PTR_ERR(th);
 221         th->th_sync = 1;
 222
 223         tti->tti_off = 0;
 224         tti->tti_buf.lb_buf = &buf;
 225         tti->tti_buf.lb_len = sizeof(buf);
 226
 227         rc = dt_declare_record_write(env, tgt->lut_reply_data,
 228                                      &tti->tti_buf, tti->tti_off, th);
 229         if (rc)
 230                 GOTO(out, rc);
 231
 232         rc = dt_trans_start(env, tgt->lut_bottom, th);
 233         if (rc)
 234                 GOTO(out, rc);
 235
 236         dto = dt_object_locate(tgt->lut_reply_data, th->th_dev);
 237         rc = dt_record_write(env, dto, &tti->tti_buf, &tti->tti_off, th);
 238 out:
 239         dt_trans_stop(env, tgt->lut_bottom, th);
 240         return rc;
 241 }
 242
 243 /* Write the reply data @lrd into reply_data file of target @tgt
 244  * at offset @off
 245  */
 246 static int tgt_reply_data_write(const struct lu_env *env, struct lu_target *tgt,
 247                                 struct lsd_reply_data *lrd, loff_t off,
 248                                 struct thandle *th)
 249 {
 250         struct tgt_thread_info  *tti = tgt_th_info(env);
 251         struct dt_object        *dto;
 252         struct lsd_reply_data   *buf = &tti->tti_lrd;
 253
 254         lrd->lrd_result = ptlrpc_status_hton(lrd->lrd_result);
 255
 256         buf->lrd_transno         = cpu_to_le64(lrd->lrd_transno);
 257         buf->lrd_xid             = cpu_to_le64(lrd->lrd_xid);
 258         buf->lrd_data            = cpu_to_le64(lrd->lrd_data);
 259         buf->lrd_result          = cpu_to_le32(lrd->lrd_result);
 260         buf->lrd_client_gen      = cpu_to_le32(lrd->lrd_client_gen);
 261
 262         lrd->lrd_result = ptlrpc_status_ntoh(lrd->lrd_result);
 263
 264         tti->tti_off = off;
 265         tti->tti_buf.lb_buf = buf;
 266         tti->tti_buf.lb_len = sizeof(*buf);
 267
 268         dto = dt_object_locate(tgt->lut_reply_data, th->th_dev);
 269         return dt_record_write(env, dto, &tti->tti_buf, &tti->tti_off, th);
 270 }
 271
 272 /* Read the reply data from reply_data file of target @tgt at offset @off
 273  * into structure @lrd
 274  */
 275 static int tgt_reply_data_read(const struct lu_env *env, struct lu_target *tgt,
 276                                struct lsd_reply_data *lrd, loff_t off)
 277 {
 278         int                      rc;
 279         struct tgt_thread_info  *tti = tgt_th_info(env);
 280         struct lsd_reply_data   *buf = &tti->tti_lrd;
 281
 282         tti->tti_off = off;
 283         tti->tti_buf.lb_buf = buf;
 284         tti->tti_buf.lb_len = sizeof(*buf);
 285
 286         rc = dt_record_read(env, tgt->lut_reply_data, &tti->tti_buf,
 287                             &tti->tti_off);
 288         if (rc != 0)
 289                 return rc;
 290
 291         lrd->lrd_transno         = le64_to_cpu(buf->lrd_transno);
 292         lrd->lrd_xid             = le64_to_cpu(buf->lrd_xid);
 293         lrd->lrd_data            = le64_to_cpu(buf->lrd_data);
 294         lrd->lrd_result          = le32_to_cpu(buf->lrd_result);
 295         lrd->lrd_client_gen      = le32_to_cpu(buf->lrd_client_gen);
 296
 297         return 0;
 298 }
 299
 300
 301 /* Free the in-memory reply data structure @trd and release
 302  * the corresponding slot in the reply_data file of target @lut
 303  * Called with ted_lcd_lock held
 304  */
 305 static void tgt_free_reply_data(struct lu_target *lut,
 306                                 struct tg_export_data *ted,
 307                                 struct tg_reply_data *trd)
 308 {
 309         CDEBUG(D_TRACE, "%s: free reply data %p: xid %llu, transno %llu, "
 310                "client gen %u, slot idx %d\n",
 311                lut == NULL ? "" : tgt_name(lut), trd, trd->trd_reply.lrd_xid,
 312                trd->trd_reply.lrd_transno, trd->trd_reply.lrd_client_gen,
 313                trd->trd_index);
 314
 315         LASSERT(mutex_is_locked(&ted->ted_lcd_lock));
 316
 317         list_del(&trd->trd_list);
 318         ted->ted_reply_cnt--;
 319         if (lut != NULL)
 320                 tgt_clear_reply_slot(lut, trd->trd_index);
 321         OBD_FREE_PTR(trd);
 322 }
 323
 324 /* Release the reply data @trd from target @lut
 325  * The reply data with the highest transno for this export
 326  * is retained to ensure correctness of target recovery
 327  * Called with ted_lcd_lock held
 328  */
 329 static void tgt_release_reply_data(struct lu_target *lut,
 330                                    struct tg_export_data *ted,
 331                                    struct tg_reply_data *trd)
 332 {
 333         CDEBUG(D_TRACE, "%s: release reply data %p: xid %llu, transno %llu, "
 334                "client gen %u, slot idx %d\n",
 335                lut == NULL ? "" : tgt_name(lut), trd, trd->trd_reply.lrd_xid,
 336                trd->trd_reply.lrd_transno, trd->trd_reply.lrd_client_gen,
 337                trd->trd_index);
 338
 339         LASSERT(mutex_is_locked(&ted->ted_lcd_lock));
 340
 341         /* Do not free the reply data corresponding to the
 342          * highest transno of this export.
 343          * This ensures on-disk reply data is kept and
 344          * last committed transno can be restored from disk in case
 345          * of target recovery
 346          */
 347         if (trd->trd_reply.lrd_transno == ted->ted_lcd->lcd_last_transno) {
 348                 /* free previous retained reply */
 349                 if (ted->ted_reply_last != NULL)
 350                         tgt_free_reply_data(lut, ted, ted->ted_reply_last);
 351                 /* retain the reply */
 352                 list_del_init(&trd->trd_list);
 353                 ted->ted_reply_last = trd;
 354         } else {
 355                 tgt_free_reply_data(lut, ted, trd);
 356         }
 357 }
 358
 359 static inline struct lu_buf *tti_buf_lsd(struct tgt_thread_info *tti)
 360 {
 361         tti->tti_buf.lb_buf = &tti->tti_lsd;
 362         tti->tti_buf.lb_len = sizeof(tti->tti_lsd);
 363         return &tti->tti_buf;
 364 }
 365
 366 static inline struct lu_buf *tti_buf_lcd(struct tgt_thread_info *tti)
 367 {
 368         tti->tti_buf.lb_buf = &tti->tti_lcd;
 369         tti->tti_buf.lb_len = sizeof(tti->tti_lcd);
 370         return &tti->tti_buf;
 371 }
 372
 373 /**
 374  * Allocate in-memory data for client slot related to export.
 375  */
 376 int tgt_client_alloc(struct obd_export *exp)
 377 {
 378         ENTRY;
 379         LASSERT(exp != exp->exp_obd->obd_self_export);
 380
 381         OBD_ALLOC_PTR(exp->exp_target_data.ted_lcd);
 382         if (exp->exp_target_data.ted_lcd == NULL)
 383                 RETURN(-ENOMEM);
 384         /* Mark that slot is not yet valid, 0 doesn't work here */
 385         exp->exp_target_data.ted_lr_idx = -1;
 386         INIT_LIST_HEAD(&exp->exp_target_data.ted_reply_list);
 387         mutex_init(&exp->exp_target_data.ted_lcd_lock);
 388         RETURN(0);
 389 }
 390 EXPORT_SYMBOL(tgt_client_alloc);
 391
 392 /**
 393  * Free in-memory data for client slot related to export.
 394  */
 395 void tgt_client_free(struct obd_export *exp)
 396 {
 397         struct tg_export_data   *ted = &exp->exp_target_data;
 398         struct lu_target        *lut = class_exp2tgt(exp);
 399         struct tg_reply_data    *trd, *tmp;
 400
 401         LASSERT(exp != exp->exp_obd->obd_self_export);
 402
 403         /* free reply data */
 404         mutex_lock(&ted->ted_lcd_lock);
 405         list_for_each_entry_safe(trd, tmp, &ted->ted_reply_list, trd_list) {
 406                 tgt_release_reply_data(lut, ted, trd);
 407         }
 408         if (ted->ted_reply_last != NULL) {
 409                 tgt_free_reply_data(lut, ted, ted->ted_reply_last);
 410                 ted->ted_reply_last = NULL;
 411         }
 412         mutex_unlock(&ted->ted_lcd_lock);
 413
 414         if (!hlist_unhashed(&exp->exp_gen_hash))
 415                 cfs_hash_del(exp->exp_obd->obd_gen_hash,
 416                              &ted->ted_lcd->lcd_generation,
 417                              &exp->exp_gen_hash);
 418
 419         OBD_FREE_PTR(ted->ted_lcd);
 420         ted->ted_lcd = NULL;
 421
 422         /* Target may have been freed (see LU-7430)
 423          * Slot may be not yet assigned */
 424         if (exp->exp_obd->u.obt.obt_magic != OBT_MAGIC ||
 425             ted->ted_lr_idx < 0)
 426                 return;
 427
 428         /* Clear bit when lcd is freed */
 429         LASSERT(lut && lut->lut_client_bitmap);
 430         if (!test_and_clear_bit(ted->ted_lr_idx, lut->lut_client_bitmap)) {
 431                 CERROR("%s: client %u bit already clear in bitmap\n",
 432                        exp->exp_obd->obd_name, ted->ted_lr_idx);
 433                 LBUG();
 434         }
 435
 436         if (tgt_is_multimodrpcs_client(exp) && !exp->exp_obd->obd_stopping)
 437                 atomic_dec(&lut->lut_num_clients);
 438 }
 439 EXPORT_SYMBOL(tgt_client_free);
 440
 441 int tgt_client_data_read(const struct lu_env *env, struct lu_target *tgt,
 442                          struct lsd_client_data *lcd, loff_t *off, int index)
 443 {
 444         struct tgt_thread_info  *tti = tgt_th_info(env);
 445         int                      rc;
 446
 447         tti_buf_lcd(tti);
 448         rc = dt_record_read(env, tgt->lut_last_rcvd, &tti->tti_buf, off);
 449         if (rc == 0) {
 450                 check_lcd(tgt->lut_obd->obd_name, index, &tti->tti_lcd);
 451                 lcd_le_to_cpu(&tti->tti_lcd, lcd);
 452                 lcd->lcd_last_result = ptlrpc_status_ntoh(lcd->lcd_last_result);
 453                 lcd->lcd_last_close_result =
 454                         ptlrpc_status_ntoh(lcd->lcd_last_close_result);
 455         }
 456
 457         CDEBUG(D_INFO, "%s: read lcd @%lld uuid = %s, last_transno = "LPU64
 458                ", last_xid = "LPU64", last_result = %u, last_data = %u, "
 459                "last_close_transno = "LPU64", last_close_xid = "LPU64", "
 460                "last_close_result = %u, rc = %d\n", tgt->lut_obd->obd_name,
 461                *off, lcd->lcd_uuid, lcd->lcd_last_transno, lcd->lcd_last_xid,
 462                lcd->lcd_last_result, lcd->lcd_last_data,
 463                lcd->lcd_last_close_transno, lcd->lcd_last_close_xid,
 464                lcd->lcd_last_close_result, rc);
 465         return rc;
 466 }
 467
 468 int tgt_client_data_write(const struct lu_env *env, struct lu_target *tgt,
 469                           struct lsd_client_data *lcd, loff_t *off,
 470                           struct thandle *th)
 471 {
 472         struct tgt_thread_info *tti = tgt_th_info(env);
 473         struct dt_object        *dto;
 474
 475         lcd->lcd_last_result = ptlrpc_status_hton(lcd->lcd_last_result);
 476         lcd->lcd_last_close_result =
 477                 ptlrpc_status_hton(lcd->lcd_last_close_result);
 478         lcd_cpu_to_le(lcd, &tti->tti_lcd);
 479         tti_buf_lcd(tti);
 480
 481         dto = dt_object_locate(tgt->lut_last_rcvd, th->th_dev);
 482         return dt_record_write(env, dto, &tti->tti_buf, off, th);
 483 }
 484
 485 /**
 486  * Update client data in last_rcvd
 487  */
 488 static int tgt_client_data_update(const struct lu_env *env,
 489                                   struct obd_export *exp)
 490 {
 491         struct tg_export_data   *ted = &exp->exp_target_data;
 492         struct lu_target        *tgt = class_exp2tgt(exp);
 493         struct tgt_thread_info  *tti = tgt_th_info(env);
 494         struct thandle          *th;
 495         int                      rc = 0;
 496
 497         ENTRY;
 498
 499         if (unlikely(tgt == NULL)) {
 500                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
 501                           class_exp2obd(exp)->obd_name);
 502                 RETURN(-EINVAL);
 503         }
 504
 505         th = dt_trans_create(env, tgt->lut_bottom);
 506         if (IS_ERR(th))
 507                 RETURN(PTR_ERR(th));
 508
 509         tti_buf_lcd(tti);
 510         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
 511                                      &tti->tti_buf,
 512                                      ted->ted_lr_off, th);
 513         if (rc)
 514                 GOTO(out, rc);
 515
 516         rc = dt_trans_start_local(env, tgt->lut_bottom, th);
 517         if (rc)
 518                 GOTO(out, rc);
 519         /*
 520          * Until this operations will be committed the sync is needed
 521          * for this export. This should be done _after_ starting the
 522          * transaction so that many connecting clients will not bring
 523          * server down with lots of sync writes.
 524          */
 525         rc = tgt_new_client_cb_add(th, exp);
 526         if (rc) {
 527                 /* can't add callback, do sync now */
 528                 th->th_sync = 1;
 529         } else {
 530                 spin_lock(&exp->exp_lock);
 531                 exp->exp_need_sync = 1;
 532                 spin_unlock(&exp->exp_lock);
 533         }
 534
 535         tti->tti_off = ted->ted_lr_off;
 536         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 537         EXIT;
 538 out:
 539         dt_trans_stop(env, tgt->lut_bottom, th);
 540         CDEBUG(D_INFO, "%s: update last_rcvd client data for UUID = %s, "
 541                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 542                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 543
 544         return rc;
 545 }
 546
 547 int tgt_server_data_read(const struct lu_env *env, struct lu_target *tgt)
 548 {
 549         struct tgt_thread_info  *tti = tgt_th_info(env);
 550         int                      rc;
 551
 552         tti->tti_off = 0;
 553         tti_buf_lsd(tti);
 554         rc = dt_record_read(env, tgt->lut_last_rcvd, &tti->tti_buf,
 555                             &tti->tti_off);
 556         if (rc == 0)
 557                 lsd_le_to_cpu(&tti->tti_lsd, &tgt->lut_lsd);
 558
 559         CDEBUG(D_INFO, "%s: read last_rcvd server data for UUID = %s, "
 560                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 561                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 562         return rc;
 563 }
 564
 565 int tgt_server_data_write(const struct lu_env *env, struct lu_target *tgt,
 566                           struct thandle *th)
 567 {
 568         struct tgt_thread_info  *tti = tgt_th_info(env);
 569         struct dt_object        *dto;
 570         int                      rc;
 571
 572         ENTRY;
 573
 574         tti->tti_off = 0;
 575         tti_buf_lsd(tti);
 576         lsd_cpu_to_le(&tgt->lut_lsd, &tti->tti_lsd);
 577
 578         dto = dt_object_locate(tgt->lut_last_rcvd, th->th_dev);
 579         rc = dt_record_write(env, dto, &tti->tti_buf, &tti->tti_off, th);
 580
 581         CDEBUG(D_INFO, "%s: write last_rcvd server data for UUID = %s, "
 582                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 583                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 584
 585         RETURN(rc);
 586 }
 587
 588 /**
 589  * Update server data in last_rcvd
 590  */
 591 int tgt_server_data_update(const struct lu_env *env, struct lu_target *tgt,
 592                            int sync)
 593 {
 594         struct tgt_thread_info  *tti = tgt_th_info(env);
 595         struct thandle          *th;
 596         int                      rc = 0;
 597
 598         ENTRY;
 599
 600         CDEBUG(D_SUPER,
 601                "%s: mount_count is "LPU64", last_transno is "LPU64"\n",
 602                tgt->lut_lsd.lsd_uuid, tgt->lut_obd->u.obt.obt_mount_count,
 603                tgt->lut_last_transno);
 604
 605         /* Always save latest transno to keep it fresh */
 606         spin_lock(&tgt->lut_translock);
 607         tgt->lut_lsd.lsd_last_transno = tgt->lut_last_transno;
 608         spin_unlock(&tgt->lut_translock);
 609
 610         th = dt_trans_create(env, tgt->lut_bottom);
 611         if (IS_ERR(th))
 612                 RETURN(PTR_ERR(th));
 613
 614         th->th_sync = sync;
 615
 616         tti_buf_lsd(tti);
 617         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
 618                                      &tti->tti_buf, tti->tti_off, th);
 619         if (rc)
 620                 GOTO(out, rc);
 621
 622         rc = dt_trans_start(env, tgt->lut_bottom, th);
 623         if (rc)
 624                 GOTO(out, rc);
 625
 626         rc = tgt_server_data_write(env, tgt, th);
 627 out:
 628         dt_trans_stop(env, tgt->lut_bottom, th);
 629
 630         CDEBUG(D_INFO, "%s: update last_rcvd server data for UUID = %s, "
 631                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 632                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 633         RETURN(rc);
 634 }
 635 EXPORT_SYMBOL(tgt_server_data_update);
 636
 637 int tgt_truncate_last_rcvd(const struct lu_env *env, struct lu_target *tgt,
 638                            loff_t size)
 639 {
 640         struct dt_object *dt = tgt->lut_last_rcvd;
 641         struct thandle   *th;
 642         struct lu_attr    attr;
 643         int               rc;
 644
 645         ENTRY;
 646
 647         attr.la_size = size;
 648         attr.la_valid = LA_SIZE;
 649
 650         th = dt_trans_create(env, tgt->lut_bottom);
 651         if (IS_ERR(th))
 652                 RETURN(PTR_ERR(th));
 653         rc = dt_declare_punch(env, dt, size, OBD_OBJECT_EOF, th);
 654         if (rc)
 655                 GOTO(cleanup, rc);
 656         rc = dt_declare_attr_set(env, dt, &attr, th);
 657         if (rc)
 658                 GOTO(cleanup, rc);
 659         rc = dt_trans_start_local(env, tgt->lut_bottom, th);
 660         if (rc)
 661                 GOTO(cleanup, rc);
 662
 663         rc = dt_punch(env, dt, size, OBD_OBJECT_EOF, th);
 664         if (rc == 0)
 665                 rc = dt_attr_set(env, dt, &attr, th);
 666
 667 cleanup:
 668         dt_trans_stop(env, tgt->lut_bottom, th);
 669
 670         RETURN(rc);
 671 }
 672
 673 static void tgt_client_epoch_update(const struct lu_env *env,
 674                                     struct obd_export *exp)
 675 {
 676         struct lsd_client_data  *lcd = exp->exp_target_data.ted_lcd;
 677         struct lu_target        *tgt = class_exp2tgt(exp);
 678
 679         LASSERT(tgt && tgt->lut_bottom);
 680         /** VBR: set client last_epoch to current epoch */
 681         if (lcd->lcd_last_epoch >= tgt->lut_lsd.lsd_start_epoch)
 682                 return;
 683         lcd->lcd_last_epoch = tgt->lut_lsd.lsd_start_epoch;
 684         tgt_client_data_update(env, exp);
 685 }
 686
 687 /**
 688  * Update boot epoch when recovery ends
 689  */
 690 void tgt_boot_epoch_update(struct lu_target *tgt)
 691 {
 692         struct lu_env            env;
 693         struct ptlrpc_request   *req;
 694         __u32                    start_epoch;
 695         struct list_head         client_list;
 696         int                      rc;
 697
 698         if (tgt->lut_obd->obd_stopping)
 699                 return;
 700
 701         rc = lu_env_init(&env, LCT_DT_THREAD);
 702         if (rc) {
 703                 CERROR("%s: can't initialize environment: rc = %d\n",
 704                         tgt->lut_obd->obd_name, rc);
 705                 return;
 706         }
 707
 708         spin_lock(&tgt->lut_translock);
 709         start_epoch = lr_epoch(tgt->lut_last_transno) + 1;
 710         tgt->lut_last_transno = (__u64)start_epoch << LR_EPOCH_BITS;
 711         tgt->lut_lsd.lsd_start_epoch = start_epoch;
 712         spin_unlock(&tgt->lut_translock);
 713
 714         INIT_LIST_HEAD(&client_list);
 715         /**
 716          * The recovery is not yet finished and final queue can still be updated
 717          * with resend requests. Move final list to separate one for processing
 718          */
 719         spin_lock(&tgt->lut_obd->obd_recovery_task_lock);
 720         list_splice_init(&tgt->lut_obd->obd_final_req_queue, &client_list);
 721         spin_unlock(&tgt->lut_obd->obd_recovery_task_lock);
 722
 723         /**
 724          * go through list of exports participated in recovery and
 725          * set new epoch for them
 726          */
 727         list_for_each_entry(req, &client_list, rq_list) {
 728                 LASSERT(!req->rq_export->exp_delayed);
 729                 if (!req->rq_export->exp_vbr_failed)
 730                         tgt_client_epoch_update(&env, req->rq_export);
 731         }
 732         /** return list back at once */
 733         spin_lock(&tgt->lut_obd->obd_recovery_task_lock);
 734         list_splice_init(&client_list, &tgt->lut_obd->obd_final_req_queue);
 735         spin_unlock(&tgt->lut_obd->obd_recovery_task_lock);
 736
 737         /** Clear MULTI RPCS incompatibility flag if
 738          * - target is MDT and
 739          * - there is no client to recover or the recovery was aborted
 740          */
 741         if (!strncmp(tgt->lut_obd->obd_type->typ_name, LUSTRE_MDT_NAME, 3) &&
 742             (tgt->lut_obd->obd_max_recoverable_clients == 0 ||
 743             tgt->lut_obd->obd_abort_recovery))
 744                 tgt->lut_lsd.lsd_feature_incompat &= ~OBD_INCOMPAT_MULTI_RPCS;
 745
 746         /** update server epoch */
 747         tgt_server_data_update(&env, tgt, 1);
 748         lu_env_fini(&env);
 749 }
 750
 751 /**
 752  * commit callback, need to update last_committed value
 753  */
 754 struct tgt_last_committed_callback {
 755         struct dt_txn_commit_cb  llcc_cb;
 756         struct lu_target        *llcc_tgt;
 757         struct obd_export       *llcc_exp;
 758         __u64                    llcc_transno;
 759 };
 760
 761 static void tgt_cb_last_committed(struct lu_env *env, struct thandle *th,
 762                                   struct dt_txn_commit_cb *cb, int err)
 763 {
 764         struct tgt_last_committed_callback *ccb;
 765
 766         ccb = container_of0(cb, struct tgt_last_committed_callback, llcc_cb);
 767
 768         LASSERT(ccb->llcc_exp);
 769         LASSERT(ccb->llcc_tgt != NULL);
 770         LASSERT(ccb->llcc_exp->exp_obd == ccb->llcc_tgt->lut_obd);
 771
 772         /* Fast path w/o spinlock, if exp_last_committed was updated
 773          * with higher transno, no need to take spinlock and check,
 774          * also no need to update obd_last_committed. */
 775         if (ccb->llcc_transno <= ccb->llcc_exp->exp_last_committed)
 776                 goto out;
 777         spin_lock(&ccb->llcc_tgt->lut_translock);
 778         if (ccb->llcc_transno > ccb->llcc_tgt->lut_obd->obd_last_committed)
 779                 ccb->llcc_tgt->lut_obd->obd_last_committed = ccb->llcc_transno;
 780
 781         if (ccb->llcc_transno > ccb->llcc_exp->exp_last_committed) {
 782                 ccb->llcc_exp->exp_last_committed = ccb->llcc_transno;
 783                 spin_unlock(&ccb->llcc_tgt->lut_translock);
 784                 ptlrpc_commit_replies(ccb->llcc_exp);
 785         } else {
 786                 spin_unlock(&ccb->llcc_tgt->lut_translock);
 787         }
 788 out:
 789         class_export_cb_put(ccb->llcc_exp);
 790         if (ccb->llcc_transno)
 791                 CDEBUG(D_HA, "%s: transno "LPD64" is committed\n",
 792                        ccb->llcc_tgt->lut_obd->obd_name, ccb->llcc_transno);
 793         OBD_FREE_PTR(ccb);
 794 }
 795
 796 int tgt_last_commit_cb_add(struct thandle *th, struct lu_target *tgt,
 797                            struct obd_export *exp, __u64 transno)
 798 {
 799         struct tgt_last_committed_callback      *ccb;
 800         struct dt_txn_commit_cb                 *dcb;
 801         int                                      rc;
 802
 803         OBD_ALLOC_PTR(ccb);
 804         if (ccb == NULL)
 805                 return -ENOMEM;
 806
 807         ccb->llcc_tgt = tgt;
 808         ccb->llcc_exp = class_export_cb_get(exp);
 809         ccb->llcc_transno = transno;
 810
 811         dcb = &ccb->llcc_cb;
 812         dcb->dcb_func = tgt_cb_last_committed;
 813         INIT_LIST_HEAD(&dcb->dcb_linkage);
 814         strlcpy(dcb->dcb_name, "tgt_cb_last_committed", sizeof(dcb->dcb_name));
 815
 816         rc = dt_trans_cb_add(th, dcb);
 817         if (rc) {
 818                 class_export_cb_put(exp);
 819                 OBD_FREE_PTR(ccb);
 820         }
 821
 822         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 823                 /* report failure to force synchronous operation */
 824                 return -EPERM;
 825
 826         return rc;
 827 }
 828
 829 struct tgt_new_client_callback {
 830         struct dt_txn_commit_cb  lncc_cb;
 831         struct obd_export       *lncc_exp;
 832 };
 833
 834 static void tgt_cb_new_client(struct lu_env *env, struct thandle *th,
 835                               struct dt_txn_commit_cb *cb, int err)
 836 {
 837         struct tgt_new_client_callback *ccb;
 838
 839         ccb = container_of0(cb, struct tgt_new_client_callback, lncc_cb);
 840
 841         LASSERT(ccb->lncc_exp->exp_obd);
 842
 843         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 844                ccb->lncc_exp->exp_obd->obd_name,
 845                ccb->lncc_exp->exp_client_uuid.uuid);
 846
 847         spin_lock(&ccb->lncc_exp->exp_lock);
 848
 849         ccb->lncc_exp->exp_need_sync = 0;
 850
 851         spin_unlock(&ccb->lncc_exp->exp_lock);
 852         class_export_cb_put(ccb->lncc_exp);
 853
 854         OBD_FREE_PTR(ccb);
 855 }
 856
 857 int tgt_new_client_cb_add(struct thandle *th, struct obd_export *exp)
 858 {
 859         struct tgt_new_client_callback  *ccb;
 860         struct dt_txn_commit_cb         *dcb;
 861         int                              rc;
 862
 863         OBD_ALLOC_PTR(ccb);
 864         if (ccb == NULL)
 865                 return -ENOMEM;
 866
 867         ccb->lncc_exp = class_export_cb_get(exp);
 868
 869         dcb = &ccb->lncc_cb;
 870         dcb->dcb_func = tgt_cb_new_client;
 871         INIT_LIST_HEAD(&dcb->dcb_linkage);
 872         strlcpy(dcb->dcb_name, "tgt_cb_new_client", sizeof(dcb->dcb_name));
 873
 874         rc = dt_trans_cb_add(th, dcb);
 875         if (rc) {
 876                 class_export_cb_put(exp);
 877                 OBD_FREE_PTR(ccb);
 878         }
 879         return rc;
 880 }
 881
 882 /**
 883  * Add new client to the last_rcvd upon new connection.
 884  *
 885  * We use a bitmap to locate a free space in the last_rcvd file and initialize
 886  * tg_export_data.
 887  */
 888 int tgt_client_new(const struct lu_env *env, struct obd_export *exp)
 889 {
 890         struct tg_export_data   *ted = &exp->exp_target_data;
 891         struct lu_target        *tgt = class_exp2tgt(exp);
 892         int                      rc = 0, idx;
 893
 894         ENTRY;
 895
 896         LASSERT(tgt && tgt->lut_client_bitmap != NULL);
 897         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid))
 898                 RETURN(0);
 899
 900         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 901                 RETURN(0);
 902
 903         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 904          * there's no need for extra complication here
 905          */
 906         idx = find_first_zero_bit(tgt->lut_client_bitmap, LR_MAX_CLIENTS);
 907 repeat:
 908         if (idx >= LR_MAX_CLIENTS ||
 909             OBD_FAIL_CHECK(OBD_FAIL_MDS_CLIENT_ADD)) {
 910                 CERROR("%s: no room for %u clients - fix LR_MAX_CLIENTS\n",
 911                        tgt->lut_obd->obd_name,  idx);
 912                 RETURN(-EOVERFLOW);
 913         }
 914         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 915                 idx = find_next_zero_bit(tgt->lut_client_bitmap,
 916                                              LR_MAX_CLIENTS, idx);
 917                 goto repeat;
 918         }
 919
 920         ted->ted_lr_idx = idx;
 921         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
 922                           idx * tgt->lut_lsd.lsd_client_size;
 923
 924         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 925
 926         if (tgt_is_multimodrpcs_client(exp)) {
 927                 /* Set MULTI RPCS incompatibility flag to prevent previous
 928                  * Lustre versions to mount a target with reply_data file */
 929                 atomic_inc(&tgt->lut_num_clients);
 930                 if (!(tgt->lut_lsd.lsd_feature_incompat &
 931                       OBD_INCOMPAT_MULTI_RPCS)) {
 932                         tgt->lut_lsd.lsd_feature_incompat |=
 933                                                         OBD_INCOMPAT_MULTI_RPCS;
 934                         rc = tgt_server_data_update(env, tgt, 1);
 935                         if (rc < 0) {
 936                                 CERROR("%s: unable to set MULTI RPCS "
 937                                        "incompatibility flag\n",
 938                                        exp->exp_obd->obd_name);
 939                                 RETURN(rc);
 940                         }
 941                 }
 942
 943                 /* assign client slot generation */
 944                 ted->ted_lcd->lcd_generation =
 945                                 atomic_inc_return(&tgt->lut_client_generation);
 946         } else {
 947                 ted->ted_lcd->lcd_generation = 0;
 948         }
 949
 950         CDEBUG(D_INFO, "%s: new client at index %d (%llu) with UUID '%s' "
 951                "generation %d\n",
 952                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
 953                ted->ted_lcd->lcd_uuid, ted->ted_lcd->lcd_generation);
 954
 955         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_CLIENT_ADD))
 956                 RETURN(-ENOSPC);
 957
 958         rc = tgt_client_data_update(env, exp);
 959         if (rc)
 960                 CERROR("%s: Failed to write client lcd at idx %d, rc %d\n",
 961                        tgt->lut_obd->obd_name, idx, rc);
 962
 963         RETURN(rc);
 964 }
 965 EXPORT_SYMBOL(tgt_client_new);
 966
 967 /* Add an existing client to the MDS in-memory state based on
 968  * a client that was previously found in the last_rcvd file and
 969  * already has an assigned slot (idx >= 0).
 970  *
 971  * It should not be possible to fail adding an existing client - otherwise
 972  * mdt_init_server_data() callsite needs to be fixed.
 973  */
 974 int tgt_client_add(const struct lu_env *env,  struct obd_export *exp, int idx)
 975 {
 976         struct tg_export_data   *ted = &exp->exp_target_data;
 977         struct lu_target        *tgt = class_exp2tgt(exp);
 978
 979         ENTRY;
 980
 981         LASSERT(tgt && tgt->lut_client_bitmap != NULL);
 982         LASSERTF(idx >= 0, "%d\n", idx);
 983
 984         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid) ||
 985             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 986                 RETURN(0);
 987
 988         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 989                 CERROR("%s: client %d: bit already set in bitmap!!\n",
 990                        tgt->lut_obd->obd_name,  idx);
 991                 LBUG();
 992         }
 993         atomic_inc(&tgt->lut_num_clients);
 994
 995         CDEBUG(D_INFO, "%s: client at idx %d with UUID '%s' added, "
 996                "generation %d\n",
 997                tgt->lut_obd->obd_name, idx, ted->ted_lcd->lcd_uuid,
 998                ted->ted_lcd->lcd_generation);
 999
1000         ted->ted_lr_idx = idx;
1001         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
1002                           idx * tgt->lut_lsd.lsd_client_size;
1003
1004         mutex_init(&ted->ted_lcd_lock);
1005
1006         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
1007
1008         RETURN(0);
1009 }
1010
1011 int tgt_client_del(const struct lu_env *env, struct obd_export *exp)
1012 {
1013         struct tg_export_data   *ted = &exp->exp_target_data;
1014         struct lu_target        *tgt = class_exp2tgt(exp);
1015         int                      rc;
1016
1017         ENTRY;
1018
1019         LASSERT(ted->ted_lcd);
1020
1021         if (unlikely(tgt == NULL)) {
1022                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
1023                        class_exp2obd(exp)->obd_name);
1024                 RETURN(-EINVAL);
1025         }
1026
1027         /* XXX if lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
1028         if (!strcmp((char *)ted->ted_lcd->lcd_uuid,
1029                     (char *)tgt->lut_obd->obd_uuid.uuid) ||
1030             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
1031                 RETURN(0);
1032
1033         CDEBUG(D_INFO, "%s: del client at idx %u, off %lld, UUID '%s'\n",
1034                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
1035                ted->ted_lcd->lcd_uuid);
1036
1037         /* Clear the bit _after_ zeroing out the client so we don't
1038            race with filter_client_add and zero out new clients.*/
1039         if (!test_bit(ted->ted_lr_idx, tgt->lut_client_bitmap)) {
1040                 CERROR("%s: client %u: bit already clear in bitmap!!\n",
1041                        tgt->lut_obd->obd_name, ted->ted_lr_idx);
1042                 LBUG();
1043         }
1044
1045         /* Do not erase record for recoverable client. */
1046         if (exp->exp_flags & OBD_OPT_FAILOVER)
1047                 RETURN(0);
1048
1049         /* Make sure the server's last_transno is up to date.
1050          * This should be done before zeroing client slot so last_transno will
1051          * be in server data or in client data in case of failure */
1052         rc = tgt_server_data_update(env, tgt, 0);
1053         if (rc != 0) {
1054                 CERROR("%s: failed to update server data, skip client %s "
1055                        "zeroing, rc %d\n", tgt->lut_obd->obd_name,
1056                        ted->ted_lcd->lcd_uuid, rc);
1057                 RETURN(rc);
1058         }
1059
1060         mutex_lock(&ted->ted_lcd_lock);
1061         memset(ted->ted_lcd->lcd_uuid, 0, sizeof ted->ted_lcd->lcd_uuid);
1062         rc = tgt_client_data_update(env, exp);
1063         mutex_unlock(&ted->ted_lcd_lock);
1064
1065         CDEBUG(rc == 0 ? D_INFO : D_ERROR,
1066                "%s: zeroing out client %s at idx %u (%llu), rc %d\n",
1067                tgt->lut_obd->obd_name, ted->ted_lcd->lcd_uuid,
1068                ted->ted_lr_idx, ted->ted_lr_off, rc);
1069         RETURN(rc);
1070 }
1071 EXPORT_SYMBOL(tgt_client_del);
1072
1073 int tgt_add_reply_data(const struct lu_env *env, struct lu_target *tgt,
1074                        struct tg_export_data *ted, struct tg_reply_data *trd,
1075                        struct thandle *th, bool update_lrd_file)
1076 {
1077         struct lsd_reply_data   *lrd;
1078         int     i;
1079
1080         lrd = &trd->trd_reply;
1081         /* update export last transno */
1082         mutex_lock(&ted->ted_lcd_lock);
1083         if (lrd->lrd_transno > ted->ted_lcd->lcd_last_transno)
1084                 ted->ted_lcd->lcd_last_transno = lrd->lrd_transno;
1085         mutex_unlock(&ted->ted_lcd_lock);
1086
1087         /* find a empty slot */
1088         i = tgt_find_free_reply_slot(tgt);
1089         if (unlikely(i < 0)) {
1090                 CERROR("%s: couldn't find a slot for reply data: "
1091                        "rc = %d\n", tgt_name(tgt), i);
1092                 RETURN(i);
1093         }
1094         trd->trd_index = i;
1095
1096         if (update_lrd_file) {
1097                 loff_t  off;
1098                 int     rc;
1099
1100                 /* write reply data to disk */
1101                 off = sizeof(struct lsd_reply_header) + sizeof(*lrd) * i;
1102                 rc = tgt_reply_data_write(env, tgt, lrd, off, th);
1103                 if (unlikely(rc != 0)) {
1104                         CERROR("%s: can't update %s file: rc = %d\n",
1105                                tgt_name(tgt), REPLY_DATA, rc);
1106                         RETURN(rc);
1107                 }
1108         }
1109         /* add reply data to target export's reply list */
1110         mutex_lock(&ted->ted_lcd_lock);
1111         list_add(&trd->trd_list, &ted->ted_reply_list);
1112         ted->ted_reply_cnt++;
1113         if (ted->ted_reply_cnt > ted->ted_reply_max)
1114                 ted->ted_reply_max = ted->ted_reply_cnt;
1115         mutex_unlock(&ted->ted_lcd_lock);
1116
1117         CDEBUG(D_TRACE, "add reply %p: xid %llu, transno %llu, "
1118                "tag %hu, client gen %u, slot idx %d\n",
1119                trd, lrd->lrd_xid, lrd->lrd_transno,
1120                trd->trd_tag, lrd->lrd_client_gen, i);
1121         RETURN(0);
1122 }
1123 EXPORT_SYMBOL(tgt_add_reply_data);
1124
1125 /*
1126  * last_rcvd & last_committed update callbacks
1127  */
1128 static int tgt_last_rcvd_update(const struct lu_env *env, struct lu_target *tgt,
1129                                 struct dt_object *obj, __u64 opdata,
1130                                 struct thandle *th, struct ptlrpc_request *req)
1131 {
1132         struct tgt_thread_info  *tti = tgt_th_info(env);
1133         struct tgt_session_info *tsi = tgt_ses_info(env);
1134         struct obd_export       *exp = tsi->tsi_exp;
1135         struct tg_export_data   *ted;
1136         __u64                   *transno_p;
1137         int                      rc = 0;
1138         bool                     lw_client;
1139
1140         ENTRY;
1141
1142
1143         LASSERT(exp != NULL);
1144         ted = &exp->exp_target_data;
1145
1146         lw_client = exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT;
1147         if (ted->ted_lr_idx < 0 && !lw_client)
1148                 /* ofd connect may cause transaction before export has
1149                  * last_rcvd slot */
1150                 RETURN(0);
1151
1152         if (req != NULL)
1153                 tti->tti_transno = lustre_msg_get_transno(req->rq_reqmsg);
1154         else
1155                 /* From update replay, tti_transno should be set already */
1156                 LASSERT(tti->tti_transno != 0);
1157
1158         spin_lock(&tgt->lut_translock);
1159         if (th->th_result != 0) {
1160                 if (tti->tti_transno != 0) {
1161                         CERROR("%s: replay transno "LPU64" failed: rc = %d\n",
1162                                tgt_name(tgt), tti->tti_transno, th->th_result);
1163                 }
1164         } else if (tti->tti_transno == 0) {
1165                 tti->tti_transno = ++tgt->lut_last_transno;
1166         } else {
1167                 /* should be replay */
1168                 if (tti->tti_transno > tgt->lut_last_transno)
1169                         tgt->lut_last_transno = tti->tti_transno;
1170         }
1171         spin_unlock(&tgt->lut_translock);
1172
1173         /** VBR: set new versions */
1174         if (th->th_result == 0 && obj != NULL) {
1175                 struct dt_object *dto = dt_object_locate(obj, th->th_dev);
1176                 dt_version_set(env, dto, tti->tti_transno, th);
1177         }
1178
1179         /* filling reply data */
1180         CDEBUG(D_INODE, "transno = "LPU64", last_committed = "LPU64"\n",
1181                tti->tti_transno, tgt->lut_obd->obd_last_committed);
1182
1183         if (req != NULL) {
1184                 req->rq_transno = tti->tti_transno;
1185                 lustre_msg_set_transno(req->rq_repmsg, tti->tti_transno);
1186         }
1187
1188         /* if can't add callback, do sync write */
1189         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, exp, tti->tti_transno);
1190
1191         if (lw_client) {
1192                 /* All operations performed by LW clients are synchronous and
1193                  * we store the committed transno in the last_rcvd header */
1194                 spin_lock(&tgt->lut_translock);
1195                 if (tti->tti_transno > tgt->lut_lsd.lsd_last_transno) {
1196                         tgt->lut_lsd.lsd_last_transno = tti->tti_transno;
1197                         spin_unlock(&tgt->lut_translock);
1198                         /* Although lightweight (LW) connections have no slot
1199                          * in the last_rcvd, we still want to maintain
1200                          * the in-memory lsd_client_data structure in order to
1201                          * properly handle reply reconstruction. */
1202                         rc = tgt_server_data_write(env, tgt, th);
1203                 } else {
1204                         spin_unlock(&tgt->lut_translock);
1205                 }
1206         } else if (ted->ted_lr_off == 0) {
1207                 CERROR("%s: client idx %d has offset %lld\n",
1208                        tgt_name(tgt), ted->ted_lr_idx, ted->ted_lr_off);
1209                 RETURN(-EINVAL);
1210         }
1211
1212         /* Target that supports multiple reply data */
1213         if (tgt_is_multimodrpcs_client(exp)) {
1214                 struct tg_reply_data    *trd;
1215                 struct lsd_reply_data   *lrd;
1216                 __u64                   *pre_versions;
1217                 bool                    write_update;
1218
1219                 OBD_ALLOC_PTR(trd);
1220                 if (unlikely(trd == NULL))
1221                         RETURN(-ENOMEM);
1222
1223                 /* fill reply data information */
1224                 lrd = &trd->trd_reply;
1225                 lrd->lrd_transno = tti->tti_transno;
1226                 if (req != NULL) {
1227                         lrd->lrd_xid = req->rq_xid;
1228                         trd->trd_tag = lustre_msg_get_tag(req->rq_reqmsg);
1229                         pre_versions = lustre_msg_get_versions(req->rq_repmsg);
1230                         lrd->lrd_result = th->th_result;
1231                         lrd->lrd_client_gen = ted->ted_lcd->lcd_generation;
1232                         write_update = true;
1233                 } else {
1234                         LASSERT(tsi->tsi_xid != 0);
1235                         lrd->lrd_xid = tsi->tsi_xid;
1236                         lrd->lrd_result = tsi->tsi_result;
1237                         lrd->lrd_client_gen = tsi->tsi_client_gen;
1238                         trd->trd_tag = 0;
1239                         pre_versions = NULL;
1240                         write_update = false;
1241                 }
1242
1243                 lrd->lrd_data = opdata;
1244                 if (pre_versions) {
1245                         trd->trd_pre_versions[0] = pre_versions[0];
1246                         trd->trd_pre_versions[1] = pre_versions[1];
1247                         trd->trd_pre_versions[2] = pre_versions[2];
1248                         trd->trd_pre_versions[3] = pre_versions[3];
1249                 }
1250
1251                 rc = tgt_add_reply_data(env, tgt, ted, trd, th, write_update);
1252                 if (rc < 0)
1253                         OBD_FREE_PTR(trd);
1254                 return rc;
1255         }
1256
1257         /* Enough for update replay, let's return */
1258         if (req == NULL)
1259                 RETURN(rc);
1260
1261         mutex_lock(&ted->ted_lcd_lock);
1262         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
1263         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE) {
1264                 transno_p = &ted->ted_lcd->lcd_last_close_transno;
1265                 ted->ted_lcd->lcd_last_close_xid = req->rq_xid;
1266                 ted->ted_lcd->lcd_last_close_result = th->th_result;
1267         } else {
1268                 /* VBR: save versions in last_rcvd for reconstruct. */
1269                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
1270
1271                 if (pre_versions) {
1272                         ted->ted_lcd->lcd_pre_versions[0] = pre_versions[0];
1273                         ted->ted_lcd->lcd_pre_versions[1] = pre_versions[1];
1274                         ted->ted_lcd->lcd_pre_versions[2] = pre_versions[2];
1275                         ted->ted_lcd->lcd_pre_versions[3] = pre_versions[3];
1276                 }
1277                 transno_p = &ted->ted_lcd->lcd_last_transno;
1278                 ted->ted_lcd->lcd_last_xid = req->rq_xid;
1279                 ted->ted_lcd->lcd_last_result = th->th_result;
1280                 /* XXX: lcd_last_data is __u32 but intent_dispostion is __u64,
1281                  * see struct ldlm_reply->lock_policy_res1; */
1282                 ted->ted_lcd->lcd_last_data = opdata;
1283         }
1284
1285         /* Update transno in slot only if non-zero number, i.e. no errors */
1286         if (likely(tti->tti_transno != 0)) {
1287                 /* Don't overwrite bigger transaction number with lower one.
1288                  * That is not sign of problem in all cases, but in any case
1289                  * this value should be monotonically increased only. */
1290                 if (*transno_p > tti->tti_transno) {
1291                         if (!tgt->lut_no_reconstruct) {
1292                                 CERROR("%s: trying to overwrite bigger transno:"
1293                                        "on-disk: "LPU64", new: "LPU64" replay: "
1294                                        "%d. See LU-617.\n", tgt_name(tgt),
1295                                        *transno_p, tti->tti_transno,
1296                                        req_is_replay(req));
1297                                 if (req_is_replay(req)) {
1298                                         spin_lock(&req->rq_export->exp_lock);
1299                                         req->rq_export->exp_vbr_failed = 1;
1300                                         spin_unlock(&req->rq_export->exp_lock);
1301                                 }
1302                                 mutex_unlock(&ted->ted_lcd_lock);
1303                                 RETURN(req_is_replay(req) ? -EOVERFLOW : 0);
1304                         }
1305                 } else {
1306                         *transno_p = tti->tti_transno;
1307                 }
1308         }
1309
1310         if (!lw_client) {
1311                 tti->tti_off = ted->ted_lr_off;
1312                 rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
1313                 if (rc < 0) {
1314                         mutex_unlock(&ted->ted_lcd_lock);
1315                         RETURN(rc);
1316                 }
1317         }
1318         mutex_unlock(&ted->ted_lcd_lock);
1319         RETURN(rc);
1320 }
1321
1322 /*
1323  * last_rcvd update for echo client simulation.
1324  * It updates last_rcvd client slot and version of object in
1325  * simple way but with all locks to simulate all drawbacks
1326  */
1327 static int tgt_last_rcvd_update_echo(const struct lu_env *env,
1328                                      struct lu_target *tgt,
1329                                      struct dt_object *obj,
1330                                      struct thandle *th,
1331                                      struct obd_export *exp)
1332 {
1333         struct tgt_thread_info  *tti = tgt_th_info(env);
1334         struct tg_export_data   *ted = &exp->exp_target_data;
1335         int                      rc = 0;
1336
1337         ENTRY;
1338
1339         tti->tti_transno = 0;
1340
1341         spin_lock(&tgt->lut_translock);
1342         if (th->th_result == 0)
1343                 tti->tti_transno = ++tgt->lut_last_transno;
1344         spin_unlock(&tgt->lut_translock);
1345
1346         /** VBR: set new versions */
1347         if (th->th_result == 0 && obj != NULL)
1348                 dt_version_set(env, obj, tti->tti_transno, th);
1349
1350         /* if can't add callback, do sync write */
1351         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, exp,
1352                                                 tti->tti_transno);
1353
1354         LASSERT(ted->ted_lr_off > 0);
1355
1356         mutex_lock(&ted->ted_lcd_lock);
1357         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
1358         ted->ted_lcd->lcd_last_transno = tti->tti_transno;
1359         ted->ted_lcd->lcd_last_result = th->th_result;
1360
1361         tti->tti_off = ted->ted_lr_off;
1362         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
1363         mutex_unlock(&ted->ted_lcd_lock);
1364         RETURN(rc);
1365 }
1366
1367 static int tgt_clients_data_init(const struct lu_env *env,
1368                                  struct lu_target *tgt,
1369                                  unsigned long last_size)
1370 {
1371         struct obd_device       *obd = tgt->lut_obd;
1372         struct lr_server_data   *lsd = &tgt->lut_lsd;
1373         struct lsd_client_data  *lcd = NULL;
1374         struct tg_export_data   *ted;
1375         int                      cl_idx;
1376         int                      rc = 0;
1377         loff_t                   off = lsd->lsd_client_start;
1378         __u32                    generation = 0;
1379         struct cfs_hash         *hash = NULL;
1380
1381         ENTRY;
1382
1383         CLASSERT(offsetof(struct lsd_client_data, lcd_padding) +
1384                  sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
1385
1386         OBD_ALLOC_PTR(lcd);
1387         if (lcd == NULL)
1388                 RETURN(-ENOMEM);
1389
1390         hash = cfs_hash_getref(tgt->lut_obd->obd_gen_hash);
1391         if (hash == NULL)
1392                 GOTO(err_out, rc = -ENODEV);
1393
1394         for (cl_idx = 0; off < last_size; cl_idx++) {
1395                 struct obd_export       *exp;
1396                 __u64                    last_transno;
1397
1398                 /* Don't assume off is incremented properly by
1399                  * read_record(), in case sizeof(*lcd)
1400                  * isn't the same as fsd->lsd_client_size.  */
1401                 off = lsd->lsd_client_start + cl_idx * lsd->lsd_client_size;
1402                 rc = tgt_client_data_read(env, tgt, lcd, &off, cl_idx);
1403                 if (rc) {
1404                         CERROR("%s: error reading last_rcvd %s idx %d off "
1405                                "%llu: rc = %d\n", tgt_name(tgt), LAST_RCVD,
1406                                cl_idx, off, rc);
1407                         rc = 0;
1408                         break; /* read error shouldn't cause startup to fail */
1409                 }
1410
1411                 if (lcd->lcd_uuid[0] == '\0') {
1412                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
1413                                cl_idx);
1414                         continue;
1415                 }
1416
1417                 last_transno = lcd_last_transno(lcd);
1418
1419                 /* These exports are cleaned up by disconnect, so they
1420                  * need to be set up like real exports as connect does.
1421                  */
1422                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
1423                        " srv lr: "LPU64" lx: "LPU64" gen %u\n", lcd->lcd_uuid,
1424                        cl_idx, last_transno, lsd->lsd_last_transno,
1425                        lcd_last_xid(lcd), lcd->lcd_generation);
1426
1427                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
1428                 if (IS_ERR(exp)) {
1429                         if (PTR_ERR(exp) == -EALREADY) {
1430                                 /* export already exists, zero out this one */
1431                                 CERROR("%s: Duplicate export %s!\n",
1432                                        tgt_name(tgt), lcd->lcd_uuid);
1433                                 continue;
1434                         }
1435                         GOTO(err_out, rc = PTR_ERR(exp));
1436                 }
1437
1438                 ted = &exp->exp_target_data;
1439                 *ted->ted_lcd = *lcd;
1440
1441                 rc = tgt_client_add(env, exp, cl_idx);
1442                 LASSERTF(rc == 0, "rc = %d\n", rc); /* can't fail existing */
1443                 /* VBR: set export last committed version */
1444                 exp->exp_last_committed = last_transno;
1445                 spin_lock(&exp->exp_lock);
1446                 exp->exp_connecting = 0;
1447                 exp->exp_in_recovery = 0;
1448                 spin_unlock(&exp->exp_lock);
1449                 obd->obd_max_recoverable_clients++;
1450
1451                 if (tgt->lut_lsd.lsd_feature_incompat &
1452                     OBD_INCOMPAT_MULTI_RPCS &&
1453                     lcd->lcd_generation != 0) {
1454                         /* compute the highest valid client generation */
1455                         generation = max(generation, lcd->lcd_generation);
1456                         /* fill client_generation <-> export hash table */
1457                         rc = cfs_hash_add_unique(hash, &lcd->lcd_generation,
1458                                                  &exp->exp_gen_hash);
1459                         if (rc != 0) {
1460                                 CERROR("%s: duplicate export for client "
1461                                        "generation %u\n",
1462                                        tgt_name(tgt), lcd->lcd_generation);
1463                                 class_export_put(exp);
1464                                 GOTO(err_out, rc);
1465                         }
1466                 }
1467
1468                 class_export_put(exp);
1469
1470                 rc = rev_import_init(exp);
1471                 if (rc != 0) {
1472                         class_unlink_export(exp);
1473                         GOTO(err_out, rc);
1474                 }
1475
1476                 /* Need to check last_rcvd even for duplicated exports. */
1477                 CDEBUG(D_OTHER, "client at idx %d has last_transno = "LPU64"\n",
1478                        cl_idx, last_transno);
1479
1480                 spin_lock(&tgt->lut_translock);
1481                 tgt->lut_last_transno = max(last_transno,
1482                                             tgt->lut_last_transno);
1483                 spin_unlock(&tgt->lut_translock);
1484         }
1485
1486         /* record highest valid client generation */
1487         atomic_set(&tgt->lut_client_generation, generation);
1488
1489 err_out:
1490         if (hash != NULL)
1491                 cfs_hash_putref(hash);
1492         OBD_FREE_PTR(lcd);
1493         RETURN(rc);
1494 }
1495
1496 struct server_compat_data {
1497         __u32 rocompat;
1498         __u32 incompat;
1499         __u32 rocinit;
1500         __u32 incinit;
1501 };
1502
1503 static struct server_compat_data tgt_scd[] = {
1504         [LDD_F_SV_TYPE_MDT] = {
1505                 .rocompat = OBD_ROCOMPAT_LOVOBJID,
1506                 .incompat = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
1507                             OBD_INCOMPAT_FID | OBD_INCOMPAT_IAM_DIR |
1508                             OBD_INCOMPAT_LMM_VER | OBD_INCOMPAT_MULTI_OI |
1509                             OBD_INCOMPAT_MULTI_RPCS,
1510                 .rocinit = OBD_ROCOMPAT_LOVOBJID,
1511                 .incinit = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
1512                            OBD_INCOMPAT_MULTI_OI,
1513         },
1514         [LDD_F_SV_TYPE_OST] = {
1515                 .rocompat = OBD_ROCOMPAT_IDX_IN_IDIF,
1516                 .incompat = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR |
1517                             OBD_INCOMPAT_FID,
1518                 .rocinit = OBD_ROCOMPAT_IDX_IN_IDIF,
1519                 .incinit = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR,
1520         }
1521 };
1522
1523 int tgt_server_data_init(const struct lu_env *env, struct lu_target *tgt)
1524 {
1525         struct tgt_thread_info          *tti = tgt_th_info(env);
1526         struct lr_server_data           *lsd = &tgt->lut_lsd;
1527         unsigned long                    last_rcvd_size;
1528         __u32                            index;
1529         int                              rc, type;
1530
1531         rc = dt_attr_get(env, tgt->lut_last_rcvd, &tti->tti_attr);
1532         if (rc)
1533                 RETURN(rc);
1534
1535         last_rcvd_size = (unsigned long)tti->tti_attr.la_size;
1536
1537         /* ensure padding in the struct is the correct size */
1538         CLASSERT(offsetof(struct lr_server_data, lsd_padding) +
1539                  sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
1540
1541         rc = server_name2index(tgt_name(tgt), &index, NULL);
1542         if (rc < 0) {
1543                 CERROR("%s: Can not get index from name: rc = %d\n",
1544                        tgt_name(tgt), rc);
1545                 RETURN(rc);
1546         }
1547         /* server_name2index() returns type */
1548         type = rc;
1549         if (type != LDD_F_SV_TYPE_MDT && type != LDD_F_SV_TYPE_OST) {
1550                 CERROR("%s: unknown target type %x\n", tgt_name(tgt), type);
1551                 RETURN(-EINVAL);
1552         }
1553
1554         /* last_rcvd on OST doesn't provide reconstruct support because there
1555          * may be up to 8 in-flight write requests per single slot in
1556          * last_rcvd client data
1557          */
1558         tgt->lut_no_reconstruct = (type == LDD_F_SV_TYPE_OST);
1559
1560         if (last_rcvd_size == 0) {
1561                 LCONSOLE_WARN("%s: new disk, initializing\n", tgt_name(tgt));
1562
1563                 memcpy(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid,
1564                        sizeof(lsd->lsd_uuid));
1565                 lsd->lsd_last_transno = 0;
1566                 lsd->lsd_mount_count = 0;
1567                 lsd->lsd_server_size = LR_SERVER_SIZE;
1568                 lsd->lsd_client_start = LR_CLIENT_START;
1569                 lsd->lsd_client_size = LR_CLIENT_SIZE;
1570                 lsd->lsd_subdir_count = OBJ_SUBDIR_COUNT;
1571                 lsd->lsd_osd_index = index;
1572                 lsd->lsd_feature_rocompat = tgt_scd[type].rocinit;
1573                 lsd->lsd_feature_incompat = tgt_scd[type].incinit;
1574         } else {
1575                 rc = tgt_server_data_read(env, tgt);
1576                 if (rc) {
1577                         CERROR("%s: error reading LAST_RCVD: rc= %d\n",
1578                                tgt_name(tgt), rc);
1579                         RETURN(rc);
1580                 }
1581                 if (strcmp(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid)) {
1582                         LCONSOLE_ERROR_MSG(0x157, "Trying to start OBD %s "
1583                                            "using the wrong disk %s. Were the"
1584                                            " /dev/ assignments rearranged?\n",
1585                                            tgt->lut_obd->obd_uuid.uuid,
1586                                            lsd->lsd_uuid);
1587                         RETURN(-EINVAL);
1588                 }
1589
1590                 if (lsd->lsd_osd_index != index) {
1591                         LCONSOLE_ERROR_MSG(0x157, "%s: index %d in last rcvd "
1592                                            "is different with the index %d in"
1593                                            "config log, It might be disk"
1594                                            "corruption!\n", tgt_name(tgt),
1595                                            lsd->lsd_osd_index, index);
1596                         RETURN(-EINVAL);
1597                 }
1598         }
1599
1600         if (lsd->lsd_feature_incompat & ~tgt_scd[type].incompat) {
1601                 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
1602                        tgt_name(tgt),
1603                        lsd->lsd_feature_incompat & ~tgt_scd[type].incompat);
1604                 RETURN(-EINVAL);
1605         }
1606
1607         if (type == LDD_F_SV_TYPE_MDT)
1608                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
1609
1610         if (lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat) {
1611                 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
1612                        tgt_name(tgt),
1613                        lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat);
1614                 RETURN(-EINVAL);
1615         }
1616         /** Interop: evict all clients at first boot with 1.8 last_rcvd */
1617         if (type == LDD_F_SV_TYPE_MDT &&
1618             !(lsd->lsd_feature_compat & OBD_COMPAT_20)) {
1619                 if (last_rcvd_size > lsd->lsd_client_start) {
1620                         LCONSOLE_WARN("%s: mounting at first time on 1.8 FS, "
1621                                       "remove all clients for interop needs\n",
1622                                       tgt_name(tgt));
1623                         rc = tgt_truncate_last_rcvd(env, tgt,
1624                                                     lsd->lsd_client_start);
1625                         if (rc)
1626                                 RETURN(rc);
1627                         last_rcvd_size = lsd->lsd_client_start;
1628                 }
1629                 /** set 2.0 flag to upgrade/downgrade between 1.8 and 2.0 */
1630                 lsd->lsd_feature_compat |= OBD_COMPAT_20;
1631         }
1632
1633         spin_lock(&tgt->lut_translock);
1634         tgt->lut_last_transno = lsd->lsd_last_transno;
1635         spin_unlock(&tgt->lut_translock);
1636
1637         lsd->lsd_mount_count++;
1638
1639         CDEBUG(D_INODE, "=======,=BEGIN DUMPING LAST_RCVD========\n");
1640         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
1641                tgt_name(tgt), tgt->lut_last_transno);
1642         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
1643                tgt_name(tgt), lsd->lsd_mount_count);
1644         CDEBUG(D_INODE, "%s: server data size: %u\n",
1645                tgt_name(tgt), lsd->lsd_server_size);
1646         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
1647                tgt_name(tgt), lsd->lsd_client_start);
1648         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
1649                tgt_name(tgt), lsd->lsd_client_size);
1650         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
1651                tgt_name(tgt), last_rcvd_size);
1652         CDEBUG(D_INODE, "%s: server subdir_count: %u\n",
1653                tgt_name(tgt), lsd->lsd_subdir_count);
1654         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", tgt_name(tgt),
1655                last_rcvd_size <= lsd->lsd_client_start ? 0 :
1656                (last_rcvd_size - lsd->lsd_client_start) /
1657                 lsd->lsd_client_size);
1658         CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
1659
1660         if (lsd->lsd_server_size == 0 || lsd->lsd_client_start == 0 ||
1661             lsd->lsd_client_size == 0) {
1662                 CERROR("%s: bad last_rcvd contents!\n", tgt_name(tgt));
1663                 RETURN(-EINVAL);
1664         }
1665
1666         if (!tgt->lut_obd->obd_replayable)
1667                 CWARN("%s: recovery support OFF\n", tgt_name(tgt));
1668
1669         rc = tgt_clients_data_init(env, tgt, last_rcvd_size);
1670         if (rc < 0)
1671                 GOTO(err_client, rc);
1672
1673         spin_lock(&tgt->lut_translock);
1674         /* obd_last_committed is used for compatibility
1675          * with other lustre recovery code */
1676         tgt->lut_obd->obd_last_committed = tgt->lut_last_transno;
1677         spin_unlock(&tgt->lut_translock);
1678
1679         tgt->lut_obd->u.obt.obt_mount_count = lsd->lsd_mount_count;
1680         tgt->lut_obd->u.obt.obt_instance = (__u32)lsd->lsd_mount_count;
1681
1682         /* save it, so mount count and last_transno is current */
1683         rc = tgt_server_data_update(env, tgt, 0);
1684         if (rc < 0)
1685                 GOTO(err_client, rc);
1686
1687         RETURN(0);
1688
1689 err_client:
1690         class_disconnect_exports(tgt->lut_obd);
1691         return rc;
1692 }
1693
1694 /* add credits for last_rcvd update */
1695 int tgt_txn_start_cb(const struct lu_env *env, struct thandle *th,
1696                      void *cookie)
1697 {
1698         struct lu_target        *tgt = cookie;
1699         struct tgt_session_info *tsi;
1700         struct tgt_thread_info  *tti = tgt_th_info(env);
1701         struct dt_object        *dto;
1702         int                      rc;
1703
1704         /* if there is no session, then this transaction is not result of
1705          * request processing but some local operation */
1706         if (env->le_ses == NULL)
1707                 return 0;
1708
1709         LASSERT(tgt->lut_last_rcvd);
1710         tsi = tgt_ses_info(env);
1711         /* OFD may start transaction without export assigned */
1712         if (tsi->tsi_exp == NULL)
1713                 return 0;
1714
1715         dto = dt_object_locate(tgt->lut_last_rcvd, th->th_dev);
1716         tti_buf_lcd(tti);
1717
1718         rc = dt_declare_record_write(env, dto, &tti->tti_buf,
1719                                      tsi->tsi_exp->exp_target_data.ted_lr_off,
1720                                      th);
1721         if (rc)
1722                 return rc;
1723
1724         tti_buf_lsd(tti);
1725         rc = dt_declare_record_write(env, dto, &tti->tti_buf, 0, th);
1726         if (rc)
1727                 return rc;
1728
1729         if (tgt_is_multimodrpcs_client(tsi->tsi_exp)) {
1730                 tti->tti_off = atomic_read(&tgt->lut_num_clients) * 8
1731                                 * sizeof(struct lsd_reply_data);
1732                 tti->tti_buf.lb_buf = NULL;
1733                 tti->tti_buf.lb_len = sizeof(struct lsd_reply_data);
1734                 dto = dt_object_locate(tgt->lut_reply_data, th->th_dev);
1735                 rc = dt_declare_record_write(env, dto, &tti->tti_buf,
1736                                              tti->tti_off, th);
1737                 if (rc)
1738                         return rc;
1739         }
1740
1741         if (tsi->tsi_vbr_obj != NULL &&
1742             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu)) {
1743                 dto = dt_object_locate(tsi->tsi_vbr_obj, th->th_dev);
1744                 rc = dt_declare_version_set(env, dto, th);
1745         }
1746
1747         return rc;
1748 }
1749
1750 /* Update last_rcvd records with latests transaction data */
1751 int tgt_txn_stop_cb(const struct lu_env *env, struct thandle *th,
1752                     void *cookie)
1753 {
1754         struct lu_target        *tgt = cookie;
1755         struct tgt_session_info *tsi;
1756         struct tgt_thread_info  *tti = tgt_th_info(env);
1757         struct dt_object        *obj = NULL;
1758         int                      rc;
1759         bool                     echo_client;
1760
1761         if (env->le_ses == NULL)
1762                 return 0;
1763
1764         tsi = tgt_ses_info(env);
1765         /* OFD may start transaction without export assigned */
1766         if (tsi->tsi_exp == NULL)
1767                 return 0;
1768
1769         echo_client = (tgt_ses_req(tsi) == NULL && tsi->tsi_xid == 0);
1770
1771         if (tti->tti_has_trans && !echo_client) {
1772                 if (tti->tti_mult_trans == 0) {
1773                         CDEBUG(D_HA, "More than one transaction "LPU64"\n",
1774                                tti->tti_transno);
1775                         RETURN(0);
1776                 }
1777                 /* we need another transno to be assigned */
1778                 tti->tti_transno = 0;
1779         } else if (th->th_result == 0) {
1780                 tti->tti_has_trans = 1;
1781         }
1782
1783         if (tsi->tsi_vbr_obj != NULL &&
1784             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu)) {
1785                 obj = tsi->tsi_vbr_obj;
1786         }
1787
1788         if (unlikely(echo_client)) /* echo client special case */
1789                 rc = tgt_last_rcvd_update_echo(env, tgt, obj, th,
1790                                                tsi->tsi_exp);
1791         else
1792                 rc = tgt_last_rcvd_update(env, tgt, obj, tsi->tsi_opdata, th,
1793                                           tgt_ses_req(tsi));
1794         return rc;
1795 }
1796
1797 int tgt_reply_data_init(const struct lu_env *env, struct lu_target *tgt)
1798 {
1799         struct tgt_thread_info  *tti = tgt_th_info(env);
1800         struct lsd_reply_data   *lrd = &tti->tti_lrd;
1801         unsigned long            reply_data_size;
1802         int                      rc;
1803         struct lsd_reply_header *lrh = NULL;
1804         struct lsd_client_data  *lcd = NULL;
1805         struct tg_reply_data    *trd = NULL;
1806         int                      idx;
1807         loff_t                   off;
1808         struct cfs_hash         *hash = NULL;
1809         struct obd_export       *exp;
1810         struct tg_export_data   *ted;
1811         int                      reply_data_recovered = 0;
1812
1813         rc = dt_attr_get(env, tgt->lut_reply_data, &tti->tti_attr);
1814         if (rc)
1815                 GOTO(out, rc);
1816         reply_data_size = (unsigned long)tti->tti_attr.la_size;
1817
1818         OBD_ALLOC_PTR(lrh);
1819         if (lrh == NULL)
1820                 GOTO(out, rc = -ENOMEM);
1821
1822         if (reply_data_size == 0) {
1823                 CDEBUG(D_INFO, "%s: new reply_data file, initializing\n",
1824                        tgt_name(tgt));
1825                 lrh->lrh_magic = LRH_MAGIC;
1826                 lrh->lrh_header_size = sizeof(struct lsd_reply_header);
1827                 lrh->lrh_reply_size = sizeof(struct lsd_reply_data);
1828                 rc = tgt_reply_header_write(env, tgt, lrh);
1829                 if (rc) {
1830                         CERROR("%s: error writing %s: rc = %d\n",
1831                                tgt_name(tgt), REPLY_DATA, rc);
1832                         GOTO(out, rc);
1833                 }
1834         } else {
1835                 rc = tgt_reply_header_read(env, tgt, lrh);
1836                 if (rc) {
1837                         CERROR("%s: error reading %s: rc = %d\n",
1838                                tgt_name(tgt), REPLY_DATA, rc);
1839                         GOTO(out, rc);
1840                 }
1841                 if (lrh->lrh_magic != LRH_MAGIC ||
1842                     lrh->lrh_header_size != sizeof(struct lsd_reply_header) ||
1843                     lrh->lrh_reply_size != sizeof(struct lsd_reply_data)) {
1844                         CERROR("%s: invalid header in %s\n",
1845                                tgt_name(tgt), REPLY_DATA);
1846                         GOTO(out, rc = -EINVAL);
1847                 }
1848
1849                 hash = cfs_hash_getref(tgt->lut_obd->obd_gen_hash);
1850                 if (hash == NULL)
1851                         GOTO(out, rc = -ENODEV);
1852
1853                 OBD_ALLOC_PTR(lcd);
1854                 if (lcd == NULL)
1855                         GOTO(out, rc = -ENOMEM);
1856
1857                 OBD_ALLOC_PTR(trd);
1858                 if (trd == NULL)
1859                         GOTO(out, rc = -ENOMEM);
1860
1861                 /* Load reply_data from disk */
1862                 for (idx = 0, off = sizeof(struct lsd_reply_header);
1863                      off < reply_data_size;
1864                      idx++, off += sizeof(struct lsd_reply_data)) {
1865                         rc = tgt_reply_data_read(env, tgt, lrd, off);
1866                         if (rc) {
1867                                 CERROR("%s: error reading %s: rc = %d\n",
1868                                        tgt_name(tgt), REPLY_DATA, rc);
1869                                 GOTO(out, rc);
1870                         }
1871
1872                         exp = cfs_hash_lookup(hash, &lrd->lrd_client_gen);
1873                         if (exp == NULL) {
1874                                 /* old reply data from a disconnected client */
1875                                 continue;
1876                         }
1877                         ted = &exp->exp_target_data;
1878                         mutex_lock(&ted->ted_lcd_lock);
1879
1880                         /* create in-memory reply_data and link it to
1881                          * target export's reply list */
1882                         tgt_set_reply_slot(tgt, idx);
1883                         trd->trd_reply = *lrd;
1884                         trd->trd_pre_versions[0] = 0;
1885                         trd->trd_pre_versions[1] = 0;
1886                         trd->trd_pre_versions[2] = 0;
1887                         trd->trd_pre_versions[3] = 0;
1888                         trd->trd_index = idx;
1889                         trd->trd_tag = 0;
1890                         list_add(&trd->trd_list, &ted->ted_reply_list);
1891                         ted->ted_reply_cnt++;
1892                         if (ted->ted_reply_cnt > ted->ted_reply_max)
1893                                 ted->ted_reply_max = ted->ted_reply_cnt;
1894
1895                         CDEBUG(D_HA, "%s: restore reply %p: xid %llu, "
1896                                "transno %llu, client gen %u, slot idx %d\n",
1897                                tgt_name(tgt), trd, lrd->lrd_xid,
1898                                lrd->lrd_transno, lrd->lrd_client_gen,
1899                                trd->trd_index);
1900
1901                         /* update export last committed transation */
1902                         exp->exp_last_committed = max(exp->exp_last_committed,
1903                                                       lrd->lrd_transno);
1904
1905                         mutex_unlock(&ted->ted_lcd_lock);
1906                         class_export_put(exp);
1907
1908                         /* update target last committed transaction */
1909                         spin_lock(&tgt->lut_translock);
1910                         tgt->lut_last_transno = max(tgt->lut_last_transno,
1911                                                     lrd->lrd_transno);
1912                         spin_unlock(&tgt->lut_translock);
1913
1914                         reply_data_recovered++;
1915
1916                         OBD_ALLOC_PTR(trd);
1917                         if (trd == NULL)
1918                                 GOTO(out, rc = -ENOMEM);
1919                 }
1920                 CDEBUG(D_INFO, "%s: %d reply data have been recovered\n",
1921                        tgt_name(tgt), reply_data_recovered);
1922         }
1923
1924         spin_lock(&tgt->lut_translock);
1925         /* obd_last_committed is used for compatibility
1926          * with other lustre recovery code */
1927         tgt->lut_obd->obd_last_committed = tgt->lut_last_transno;
1928         spin_unlock(&tgt->lut_translock);
1929
1930         rc = 0;
1931
1932 out:
1933         if (hash != NULL)
1934                 cfs_hash_putref(hash);
1935         if (lcd != NULL)
1936                 OBD_FREE_PTR(lcd);
1937         if (trd != NULL)
1938                 OBD_FREE_PTR(trd);
1939         if (lrh != NULL)
1940                 OBD_FREE_PTR(lrh);
1941         return rc;
1942 }
1943
1944 struct tg_reply_data *tgt_lookup_reply_by_xid(struct tg_export_data *ted,
1945                                               __u64 xid)
1946 {
1947         struct tg_reply_data    *found = NULL;
1948         struct tg_reply_data    *reply;
1949
1950         mutex_lock(&ted->ted_lcd_lock);
1951         list_for_each_entry(reply, &ted->ted_reply_list, trd_list) {
1952                 if (reply->trd_reply.lrd_xid == xid) {
1953                         found = reply;
1954                         break;
1955                 }
1956         }
1957         mutex_unlock(&ted->ted_lcd_lock);
1958         return found;
1959 }
1960 EXPORT_SYMBOL(tgt_lookup_reply_by_xid);
1961
1962 /* Look for a reply data matching specified request @req
1963  * A copy is returned in @trd if the pointer is not NULL
1964  */
1965 bool tgt_lookup_reply(struct ptlrpc_request *req, struct tg_reply_data *trd)
1966 {
1967         struct tg_export_data   *ted = &req->rq_export->exp_target_data;
1968         struct tg_reply_data    *reply;
1969         bool                     found = false;
1970
1971         reply = tgt_lookup_reply_by_xid(ted, req->rq_xid);
1972         if (reply != NULL) {
1973                 found = true;
1974                 if (trd != NULL)
1975                         *trd = *reply;
1976         }
1977
1978         CDEBUG(D_TRACE, "%s: lookup reply xid %llu, found %d\n",
1979                tgt_name(class_exp2tgt(req->rq_export)), req->rq_xid,
1980                found ? 1 : 0);
1981
1982         return found;
1983 }
1984 EXPORT_SYMBOL(tgt_lookup_reply);
1985
1986 int tgt_handle_received_xid(struct obd_export *exp, __u64 rcvd_xid)
1987 {
1988         struct tg_export_data   *ted = &exp->exp_target_data;
1989         struct lu_target        *lut = class_exp2tgt(exp);
1990         struct tg_reply_data    *trd, *tmp;
1991
1992         mutex_lock(&ted->ted_lcd_lock);
1993         list_for_each_entry_safe(trd, tmp, &ted->ted_reply_list, trd_list) {
1994                 if (trd->trd_reply.lrd_xid > rcvd_xid)
1995                         continue;
1996                 ted->ted_release_xid++;
1997                 tgt_release_reply_data(lut, ted, trd);
1998         }
1999         mutex_unlock(&ted->ted_lcd_lock);
2000
2001         return 0;
2002 }
2003
2004 int tgt_handle_tag(struct obd_export *exp, __u16 tag)
2005 {
2006         struct tg_export_data   *ted = &exp->exp_target_data;
2007         struct lu_target        *lut = class_exp2tgt(exp);
2008         struct tg_reply_data    *trd, *tmp;
2009
2010         if (tag == 0)
2011                 return 0;
2012
2013         mutex_lock(&ted->ted_lcd_lock);
2014         list_for_each_entry_safe(trd, tmp, &ted->ted_reply_list, trd_list) {
2015                 if (trd->trd_tag != tag)
2016                         continue;
2017                 ted->ted_release_tag++;
2018                 tgt_release_reply_data(lut, ted, trd);
2019                 break;
2020         }
2021         mutex_unlock(&ted->ted_lcd_lock);
2022
2023         return 0;
2024 }
2025