lustre/target/tgt_lastrcvd.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2014, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * Lustre Unified Target
  37  * These are common function to work with last_received file
  38  *
  39  * Author: Mikhail Pershin <mike.pershin@intel.com>
  40  */
  41 #include <obd.h>
  42 #include <obd_class.h>
  43 #include <lustre_fid.h>
  44
  45 #include "tgt_internal.h"
  46
  47
  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                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         tgt_clear_reply_slot(lut, trd->trd_index);
 320         OBD_FREE_PTR(trd);
 321 }
 322
 323 /* Release the reply data @trd from target @lut
 324  * The reply data with the highest transno for this export
 325  * is retained to ensure correctness of target recovery
 326  * Called with ted_lcd_lock held
 327  */
 328 static void tgt_release_reply_data(struct lu_target *lut,
 329                                    struct tg_export_data *ted,
 330                                    struct tg_reply_data *trd)
 331 {
 332         CDEBUG(D_TRACE, "%s: release reply data %p: xid %llu, transno %llu, "
 333                "client gen %u, slot idx %d\n",
 334                tgt_name(lut), trd, trd->trd_reply.lrd_xid,
 335                trd->trd_reply.lrd_transno, trd->trd_reply.lrd_client_gen,
 336                trd->trd_index);
 337
 338         LASSERT(mutex_is_locked(&ted->ted_lcd_lock));
 339
 340         /* Do not free the reply data corresponding to the
 341          * highest transno of this export.
 342          * This ensures on-disk reply data is kept and
 343          * last committed transno can be restored from disk in case
 344          * of target recovery
 345          */
 346         if (trd->trd_reply.lrd_transno == ted->ted_lcd->lcd_last_transno) {
 347                 /* free previous retained reply */
 348                 if (ted->ted_reply_last != NULL)
 349                         tgt_free_reply_data(lut, ted, ted->ted_reply_last);
 350                 /* retain the reply */
 351                 list_del_init(&trd->trd_list);
 352                 ted->ted_reply_last = trd;
 353         } else {
 354                 tgt_free_reply_data(lut, ted, trd);
 355         }
 356 }
 357
 358 static inline struct lu_buf *tti_buf_lsd(struct tgt_thread_info *tti)
 359 {
 360         tti->tti_buf.lb_buf = &tti->tti_lsd;
 361         tti->tti_buf.lb_len = sizeof(tti->tti_lsd);
 362         return &tti->tti_buf;
 363 }
 364
 365 static inline struct lu_buf *tti_buf_lcd(struct tgt_thread_info *tti)
 366 {
 367         tti->tti_buf.lb_buf = &tti->tti_lcd;
 368         tti->tti_buf.lb_len = sizeof(tti->tti_lcd);
 369         return &tti->tti_buf;
 370 }
 371
 372 /**
 373  * Allocate in-memory data for client slot related to export.
 374  */
 375 int tgt_client_alloc(struct obd_export *exp)
 376 {
 377         ENTRY;
 378         LASSERT(exp != exp->exp_obd->obd_self_export);
 379
 380         OBD_ALLOC_PTR(exp->exp_target_data.ted_lcd);
 381         if (exp->exp_target_data.ted_lcd == NULL)
 382                 RETURN(-ENOMEM);
 383         /* Mark that slot is not yet valid, 0 doesn't work here */
 384         exp->exp_target_data.ted_lr_idx = -1;
 385         INIT_LIST_HEAD(&exp->exp_target_data.ted_reply_list);
 386         mutex_init(&exp->exp_target_data.ted_lcd_lock);
 387         RETURN(0);
 388 }
 389 EXPORT_SYMBOL(tgt_client_alloc);
 390
 391 /**
 392  * Free in-memory data for client slot related to export.
 393  */
 394 void tgt_client_free(struct obd_export *exp)
 395 {
 396         struct tg_export_data   *ted = &exp->exp_target_data;
 397         struct lu_target        *lut = class_exp2tgt(exp);
 398         struct tg_reply_data    *trd, *tmp;
 399
 400         LASSERT(exp != exp->exp_obd->obd_self_export);
 401
 402         /* free reply data */
 403         mutex_lock(&ted->ted_lcd_lock);
 404         list_for_each_entry_safe(trd, tmp, &ted->ted_reply_list, trd_list) {
 405                 tgt_release_reply_data(lut, ted, trd);
 406         }
 407         if (ted->ted_reply_last != NULL) {
 408                 tgt_free_reply_data(lut, ted, ted->ted_reply_last);
 409                 ted->ted_reply_last = NULL;
 410         }
 411         mutex_unlock(&ted->ted_lcd_lock);
 412
 413         if (!hlist_unhashed(&exp->exp_gen_hash))
 414                 cfs_hash_del(exp->exp_obd->obd_gen_hash,
 415                              &ted->ted_lcd->lcd_generation,
 416                              &exp->exp_gen_hash);
 417
 418         OBD_FREE_PTR(ted->ted_lcd);
 419         ted->ted_lcd = NULL;
 420
 421         /* Slot may be not yet assigned */
 422         if (ted->ted_lr_idx < 0)
 423                 return;
 424         /* Clear bit when lcd is freed */
 425         LASSERT(lut && lut->lut_client_bitmap);
 426         if (!test_and_clear_bit(ted->ted_lr_idx, lut->lut_client_bitmap)) {
 427                 CERROR("%s: client %u bit already clear in bitmap\n",
 428                        exp->exp_obd->obd_name, ted->ted_lr_idx);
 429                 LBUG();
 430         }
 431
 432         if (tgt_is_multimodrpcs_client(exp) && !exp->exp_obd->obd_stopping)
 433                 atomic_dec(&lut->lut_num_clients);
 434 }
 435 EXPORT_SYMBOL(tgt_client_free);
 436
 437 int tgt_client_data_read(const struct lu_env *env, struct lu_target *tgt,
 438                          struct lsd_client_data *lcd, loff_t *off, int index)
 439 {
 440         struct tgt_thread_info  *tti = tgt_th_info(env);
 441         int                      rc;
 442
 443         tti_buf_lcd(tti);
 444         rc = dt_record_read(env, tgt->lut_last_rcvd, &tti->tti_buf, off);
 445         if (rc == 0) {
 446                 check_lcd(tgt->lut_obd->obd_name, index, &tti->tti_lcd);
 447                 lcd_le_to_cpu(&tti->tti_lcd, lcd);
 448                 lcd->lcd_last_result = ptlrpc_status_ntoh(lcd->lcd_last_result);
 449                 lcd->lcd_last_close_result =
 450                         ptlrpc_status_ntoh(lcd->lcd_last_close_result);
 451         }
 452
 453         CDEBUG(D_INFO, "%s: read lcd @%lld uuid = %s, last_transno = "LPU64
 454                ", last_xid = "LPU64", last_result = %u, last_data = %u, "
 455                "last_close_transno = "LPU64", last_close_xid = "LPU64", "
 456                "last_close_result = %u, rc = %d\n", tgt->lut_obd->obd_name,
 457                *off, lcd->lcd_uuid, lcd->lcd_last_transno, lcd->lcd_last_xid,
 458                lcd->lcd_last_result, lcd->lcd_last_data,
 459                lcd->lcd_last_close_transno, lcd->lcd_last_close_xid,
 460                lcd->lcd_last_close_result, rc);
 461         return rc;
 462 }
 463
 464 int tgt_client_data_write(const struct lu_env *env, struct lu_target *tgt,
 465                           struct lsd_client_data *lcd, loff_t *off,
 466                           struct thandle *th)
 467 {
 468         struct tgt_thread_info *tti = tgt_th_info(env);
 469         struct dt_object        *dto;
 470
 471         lcd->lcd_last_result = ptlrpc_status_hton(lcd->lcd_last_result);
 472         lcd->lcd_last_close_result =
 473                 ptlrpc_status_hton(lcd->lcd_last_close_result);
 474         lcd_cpu_to_le(lcd, &tti->tti_lcd);
 475         tti_buf_lcd(tti);
 476
 477         dto = dt_object_locate(tgt->lut_last_rcvd, th->th_dev);
 478         return dt_record_write(env, dto, &tti->tti_buf, off, th);
 479 }
 480
 481 /**
 482  * Update client data in last_rcvd
 483  */
 484 static int tgt_client_data_update(const struct lu_env *env,
 485                                   struct obd_export *exp)
 486 {
 487         struct tg_export_data   *ted = &exp->exp_target_data;
 488         struct lu_target        *tgt = class_exp2tgt(exp);
 489         struct tgt_thread_info  *tti = tgt_th_info(env);
 490         struct thandle          *th;
 491         int                      rc = 0;
 492
 493         ENTRY;
 494
 495         if (unlikely(tgt == NULL)) {
 496                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
 497                           class_exp2obd(exp)->obd_name);
 498                 RETURN(-EINVAL);
 499         }
 500
 501         th = dt_trans_create(env, tgt->lut_bottom);
 502         if (IS_ERR(th))
 503                 RETURN(PTR_ERR(th));
 504
 505         tti_buf_lcd(tti);
 506         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
 507                                      &tti->tti_buf,
 508                                      ted->ted_lr_off, th);
 509         if (rc)
 510                 GOTO(out, rc);
 511
 512         rc = dt_trans_start_local(env, tgt->lut_bottom, th);
 513         if (rc)
 514                 GOTO(out, rc);
 515         /*
 516          * Until this operations will be committed the sync is needed
 517          * for this export. This should be done _after_ starting the
 518          * transaction so that many connecting clients will not bring
 519          * server down with lots of sync writes.
 520          */
 521         rc = tgt_new_client_cb_add(th, exp);
 522         if (rc) {
 523                 /* can't add callback, do sync now */
 524                 th->th_sync = 1;
 525         } else {
 526                 spin_lock(&exp->exp_lock);
 527                 exp->exp_need_sync = 1;
 528                 spin_unlock(&exp->exp_lock);
 529         }
 530
 531         tti->tti_off = ted->ted_lr_off;
 532         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 533         EXIT;
 534 out:
 535         dt_trans_stop(env, tgt->lut_bottom, th);
 536         CDEBUG(D_INFO, "%s: update last_rcvd client data for UUID = %s, "
 537                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 538                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 539
 540         return rc;
 541 }
 542
 543 int tgt_server_data_read(const struct lu_env *env, struct lu_target *tgt)
 544 {
 545         struct tgt_thread_info  *tti = tgt_th_info(env);
 546         int                      rc;
 547
 548         tti->tti_off = 0;
 549         tti_buf_lsd(tti);
 550         rc = dt_record_read(env, tgt->lut_last_rcvd, &tti->tti_buf,
 551                             &tti->tti_off);
 552         if (rc == 0)
 553                 lsd_le_to_cpu(&tti->tti_lsd, &tgt->lut_lsd);
 554
 555         CDEBUG(D_INFO, "%s: read last_rcvd server data for UUID = %s, "
 556                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 557                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 558         return rc;
 559 }
 560
 561 int tgt_server_data_write(const struct lu_env *env, struct lu_target *tgt,
 562                           struct thandle *th)
 563 {
 564         struct tgt_thread_info  *tti = tgt_th_info(env);
 565         struct dt_object        *dto;
 566         int                      rc;
 567
 568         ENTRY;
 569
 570         tti->tti_off = 0;
 571         tti_buf_lsd(tti);
 572         lsd_cpu_to_le(&tgt->lut_lsd, &tti->tti_lsd);
 573
 574         dto = dt_object_locate(tgt->lut_last_rcvd, th->th_dev);
 575         rc = dt_record_write(env, dto, &tti->tti_buf, &tti->tti_off, th);
 576
 577         CDEBUG(D_INFO, "%s: write last_rcvd server data for UUID = %s, "
 578                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 579                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 580
 581         RETURN(rc);
 582 }
 583
 584 /**
 585  * Update server data in last_rcvd
 586  */
 587 int tgt_server_data_update(const struct lu_env *env, struct lu_target *tgt,
 588                            int sync)
 589 {
 590         struct tgt_thread_info  *tti = tgt_th_info(env);
 591         struct thandle          *th;
 592         int                      rc = 0;
 593
 594         ENTRY;
 595
 596         CDEBUG(D_SUPER,
 597                "%s: mount_count is "LPU64", last_transno is "LPU64"\n",
 598                tgt->lut_lsd.lsd_uuid, tgt->lut_obd->u.obt.obt_mount_count,
 599                tgt->lut_last_transno);
 600
 601         /* Always save latest transno to keep it fresh */
 602         spin_lock(&tgt->lut_translock);
 603         tgt->lut_lsd.lsd_last_transno = tgt->lut_last_transno;
 604         spin_unlock(&tgt->lut_translock);
 605
 606         th = dt_trans_create(env, tgt->lut_bottom);
 607         if (IS_ERR(th))
 608                 RETURN(PTR_ERR(th));
 609
 610         th->th_sync = sync;
 611
 612         tti_buf_lsd(tti);
 613         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
 614                                      &tti->tti_buf, tti->tti_off, th);
 615         if (rc)
 616                 GOTO(out, rc);
 617
 618         rc = dt_trans_start(env, tgt->lut_bottom, th);
 619         if (rc)
 620                 GOTO(out, rc);
 621
 622         rc = tgt_server_data_write(env, tgt, th);
 623 out:
 624         dt_trans_stop(env, tgt->lut_bottom, th);
 625
 626         CDEBUG(D_INFO, "%s: update last_rcvd server data for UUID = %s, "
 627                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 628                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 629         RETURN(rc);
 630 }
 631 EXPORT_SYMBOL(tgt_server_data_update);
 632
 633 int tgt_truncate_last_rcvd(const struct lu_env *env, struct lu_target *tgt,
 634                            loff_t size)
 635 {
 636         struct dt_object *dt = tgt->lut_last_rcvd;
 637         struct thandle   *th;
 638         struct lu_attr    attr;
 639         int               rc;
 640
 641         ENTRY;
 642
 643         attr.la_size = size;
 644         attr.la_valid = LA_SIZE;
 645
 646         th = dt_trans_create(env, tgt->lut_bottom);
 647         if (IS_ERR(th))
 648                 RETURN(PTR_ERR(th));
 649         rc = dt_declare_punch(env, dt, size, OBD_OBJECT_EOF, th);
 650         if (rc)
 651                 GOTO(cleanup, rc);
 652         rc = dt_declare_attr_set(env, dt, &attr, th);
 653         if (rc)
 654                 GOTO(cleanup, rc);
 655         rc = dt_trans_start_local(env, tgt->lut_bottom, th);
 656         if (rc)
 657                 GOTO(cleanup, rc);
 658
 659         rc = dt_punch(env, dt, size, OBD_OBJECT_EOF, th);
 660         if (rc == 0)
 661                 rc = dt_attr_set(env, dt, &attr, th);
 662
 663 cleanup:
 664         dt_trans_stop(env, tgt->lut_bottom, th);
 665
 666         RETURN(rc);
 667 }
 668
 669 static void tgt_client_epoch_update(const struct lu_env *env,
 670                                     struct obd_export *exp)
 671 {
 672         struct lsd_client_data  *lcd = exp->exp_target_data.ted_lcd;
 673         struct lu_target        *tgt = class_exp2tgt(exp);
 674
 675         LASSERT(tgt && tgt->lut_bottom);
 676         /** VBR: set client last_epoch to current epoch */
 677         if (lcd->lcd_last_epoch >= tgt->lut_lsd.lsd_start_epoch)
 678                 return;
 679         lcd->lcd_last_epoch = tgt->lut_lsd.lsd_start_epoch;
 680         tgt_client_data_update(env, exp);
 681 }
 682
 683 /**
 684  * Update boot epoch when recovery ends
 685  */
 686 void tgt_boot_epoch_update(struct lu_target *tgt)
 687 {
 688         struct lu_env            env;
 689         struct ptlrpc_request   *req;
 690         __u32                    start_epoch;
 691         struct list_head         client_list;
 692         int                      rc;
 693
 694         if (tgt->lut_obd->obd_stopping)
 695                 return;
 696
 697         rc = lu_env_init(&env, LCT_DT_THREAD);
 698         if (rc) {
 699                 CERROR("%s: can't initialize environment: rc = %d\n",
 700                         tgt->lut_obd->obd_name, rc);
 701                 return;
 702         }
 703
 704         spin_lock(&tgt->lut_translock);
 705         start_epoch = lr_epoch(tgt->lut_last_transno) + 1;
 706         tgt->lut_last_transno = (__u64)start_epoch << LR_EPOCH_BITS;
 707         tgt->lut_lsd.lsd_start_epoch = start_epoch;
 708         spin_unlock(&tgt->lut_translock);
 709
 710         INIT_LIST_HEAD(&client_list);
 711         /**
 712          * The recovery is not yet finished and final queue can still be updated
 713          * with resend requests. Move final list to separate one for processing
 714          */
 715         spin_lock(&tgt->lut_obd->obd_recovery_task_lock);
 716         list_splice_init(&tgt->lut_obd->obd_final_req_queue, &client_list);
 717         spin_unlock(&tgt->lut_obd->obd_recovery_task_lock);
 718
 719         /**
 720          * go through list of exports participated in recovery and
 721          * set new epoch for them
 722          */
 723         list_for_each_entry(req, &client_list, rq_list) {
 724                 LASSERT(!req->rq_export->exp_delayed);
 725                 if (!req->rq_export->exp_vbr_failed)
 726                         tgt_client_epoch_update(&env, req->rq_export);
 727         }
 728         /** return list back at once */
 729         spin_lock(&tgt->lut_obd->obd_recovery_task_lock);
 730         list_splice_init(&client_list, &tgt->lut_obd->obd_final_req_queue);
 731         spin_unlock(&tgt->lut_obd->obd_recovery_task_lock);
 732
 733         /** Clear MULTI RPCS incompatibility flag if
 734          * - target is MDT and
 735          * - there is no client to recover or the recovery was aborted
 736          */
 737         if (!strncmp(tgt->lut_obd->obd_type->typ_name, LUSTRE_MDT_NAME, 3) &&
 738             (tgt->lut_obd->obd_max_recoverable_clients == 0 ||
 739             tgt->lut_obd->obd_abort_recovery))
 740                 tgt->lut_lsd.lsd_feature_incompat &= ~OBD_INCOMPAT_MULTI_RPCS;
 741
 742         /** update server epoch */
 743         tgt_server_data_update(&env, tgt, 1);
 744         lu_env_fini(&env);
 745 }
 746
 747 /**
 748  * commit callback, need to update last_commited value
 749  */
 750 struct tgt_last_committed_callback {
 751         struct dt_txn_commit_cb  llcc_cb;
 752         struct lu_target        *llcc_tgt;
 753         struct obd_export       *llcc_exp;
 754         __u64                    llcc_transno;
 755 };
 756
 757 static void tgt_cb_last_committed(struct lu_env *env, struct thandle *th,
 758                                   struct dt_txn_commit_cb *cb, int err)
 759 {
 760         struct tgt_last_committed_callback *ccb;
 761
 762         ccb = container_of0(cb, struct tgt_last_committed_callback, llcc_cb);
 763
 764         LASSERT(ccb->llcc_tgt != NULL);
 765         LASSERT(ccb->llcc_exp->exp_obd == ccb->llcc_tgt->lut_obd);
 766
 767         spin_lock(&ccb->llcc_tgt->lut_translock);
 768         if (ccb->llcc_transno > ccb->llcc_tgt->lut_obd->obd_last_committed)
 769                 ccb->llcc_tgt->lut_obd->obd_last_committed = ccb->llcc_transno;
 770
 771         LASSERT(ccb->llcc_exp);
 772         if (ccb->llcc_transno > ccb->llcc_exp->exp_last_committed) {
 773                 ccb->llcc_exp->exp_last_committed = ccb->llcc_transno;
 774                 spin_unlock(&ccb->llcc_tgt->lut_translock);
 775                 ptlrpc_commit_replies(ccb->llcc_exp);
 776         } else {
 777                 spin_unlock(&ccb->llcc_tgt->lut_translock);
 778         }
 779         class_export_cb_put(ccb->llcc_exp);
 780         if (ccb->llcc_transno)
 781                 CDEBUG(D_HA, "%s: transno "LPD64" is committed\n",
 782                        ccb->llcc_tgt->lut_obd->obd_name, ccb->llcc_transno);
 783         OBD_FREE_PTR(ccb);
 784 }
 785
 786 int tgt_last_commit_cb_add(struct thandle *th, struct lu_target *tgt,
 787                            struct obd_export *exp, __u64 transno)
 788 {
 789         struct tgt_last_committed_callback      *ccb;
 790         struct dt_txn_commit_cb                 *dcb;
 791         int                                      rc;
 792
 793         OBD_ALLOC_PTR(ccb);
 794         if (ccb == NULL)
 795                 return -ENOMEM;
 796
 797         ccb->llcc_tgt = tgt;
 798         ccb->llcc_exp = class_export_cb_get(exp);
 799         ccb->llcc_transno = transno;
 800
 801         dcb = &ccb->llcc_cb;
 802         dcb->dcb_func = tgt_cb_last_committed;
 803         INIT_LIST_HEAD(&dcb->dcb_linkage);
 804         strlcpy(dcb->dcb_name, "tgt_cb_last_committed", sizeof(dcb->dcb_name));
 805
 806         rc = dt_trans_cb_add(th, dcb);
 807         if (rc) {
 808                 class_export_cb_put(exp);
 809                 OBD_FREE_PTR(ccb);
 810         }
 811
 812         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 813                 /* report failure to force synchronous operation */
 814                 return -EPERM;
 815
 816         return rc;
 817 }
 818
 819 struct tgt_new_client_callback {
 820         struct dt_txn_commit_cb  lncc_cb;
 821         struct obd_export       *lncc_exp;
 822 };
 823
 824 static void tgt_cb_new_client(struct lu_env *env, struct thandle *th,
 825                               struct dt_txn_commit_cb *cb, int err)
 826 {
 827         struct tgt_new_client_callback *ccb;
 828
 829         ccb = container_of0(cb, struct tgt_new_client_callback, lncc_cb);
 830
 831         LASSERT(ccb->lncc_exp->exp_obd);
 832
 833         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 834                ccb->lncc_exp->exp_obd->obd_name,
 835                ccb->lncc_exp->exp_client_uuid.uuid);
 836
 837         spin_lock(&ccb->lncc_exp->exp_lock);
 838
 839         ccb->lncc_exp->exp_need_sync = 0;
 840
 841         spin_unlock(&ccb->lncc_exp->exp_lock);
 842         class_export_cb_put(ccb->lncc_exp);
 843
 844         OBD_FREE_PTR(ccb);
 845 }
 846
 847 int tgt_new_client_cb_add(struct thandle *th, struct obd_export *exp)
 848 {
 849         struct tgt_new_client_callback  *ccb;
 850         struct dt_txn_commit_cb         *dcb;
 851         int                              rc;
 852
 853         OBD_ALLOC_PTR(ccb);
 854         if (ccb == NULL)
 855                 return -ENOMEM;
 856
 857         ccb->lncc_exp = class_export_cb_get(exp);
 858
 859         dcb = &ccb->lncc_cb;
 860         dcb->dcb_func = tgt_cb_new_client;
 861         INIT_LIST_HEAD(&dcb->dcb_linkage);
 862         strlcpy(dcb->dcb_name, "tgt_cb_new_client", sizeof(dcb->dcb_name));
 863
 864         rc = dt_trans_cb_add(th, dcb);
 865         if (rc) {
 866                 class_export_cb_put(exp);
 867                 OBD_FREE_PTR(ccb);
 868         }
 869         return rc;
 870 }
 871
 872 /**
 873  * Add new client to the last_rcvd upon new connection.
 874  *
 875  * We use a bitmap to locate a free space in the last_rcvd file and initialize
 876  * tg_export_data.
 877  */
 878 int tgt_client_new(const struct lu_env *env, struct obd_export *exp)
 879 {
 880         struct tg_export_data   *ted = &exp->exp_target_data;
 881         struct lu_target        *tgt = class_exp2tgt(exp);
 882         int                      rc = 0, idx;
 883
 884         ENTRY;
 885
 886         LASSERT(tgt && tgt->lut_client_bitmap != NULL);
 887         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid))
 888                 RETURN(0);
 889
 890         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 891                 RETURN(0);
 892
 893         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 894          * there's no need for extra complication here
 895          */
 896         idx = find_first_zero_bit(tgt->lut_client_bitmap, LR_MAX_CLIENTS);
 897 repeat:
 898         if (idx >= LR_MAX_CLIENTS ||
 899             OBD_FAIL_CHECK(OBD_FAIL_MDS_CLIENT_ADD)) {
 900                 CERROR("%s: no room for %u clients - fix LR_MAX_CLIENTS\n",
 901                        tgt->lut_obd->obd_name,  idx);
 902                 RETURN(-EOVERFLOW);
 903         }
 904         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 905                 idx = find_next_zero_bit(tgt->lut_client_bitmap,
 906                                              LR_MAX_CLIENTS, idx);
 907                 goto repeat;
 908         }
 909
 910         ted->ted_lr_idx = idx;
 911         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
 912                           idx * tgt->lut_lsd.lsd_client_size;
 913
 914         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 915
 916         if (tgt_is_multimodrpcs_client(exp)) {
 917                 /* Set MULTI RPCS incompatibility flag to prevent previous
 918                  * Lustre versions to mount a target with reply_data file */
 919                 atomic_inc(&tgt->lut_num_clients);
 920                 if (!(tgt->lut_lsd.lsd_feature_incompat &
 921                       OBD_INCOMPAT_MULTI_RPCS)) {
 922                         tgt->lut_lsd.lsd_feature_incompat |=
 923                                                         OBD_INCOMPAT_MULTI_RPCS;
 924                         rc = tgt_server_data_update(env, tgt, 1);
 925                         if (rc < 0) {
 926                                 CERROR("%s: unable to set MULTI RPCS "
 927                                        "incompatibility flag\n",
 928                                        exp->exp_obd->obd_name);
 929                                 RETURN(rc);
 930                         }
 931                 }
 932
 933                 /* assign client slot generation */
 934                 ted->ted_lcd->lcd_generation =
 935                                 atomic_inc_return(&tgt->lut_client_generation);
 936         } else {
 937                 ted->ted_lcd->lcd_generation = 0;
 938         }
 939
 940         CDEBUG(D_INFO, "%s: new client at index %d (%llu) with UUID '%s' "
 941                "generation %d\n",
 942                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
 943                ted->ted_lcd->lcd_uuid, ted->ted_lcd->lcd_generation);
 944
 945         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_CLIENT_ADD))
 946                 RETURN(-ENOSPC);
 947
 948         rc = tgt_client_data_update(env, exp);
 949         if (rc)
 950                 CERROR("%s: Failed to write client lcd at idx %d, rc %d\n",
 951                        tgt->lut_obd->obd_name, idx, rc);
 952
 953         RETURN(rc);
 954 }
 955 EXPORT_SYMBOL(tgt_client_new);
 956
 957 /* Add an existing client to the MDS in-memory state based on
 958  * a client that was previously found in the last_rcvd file and
 959  * already has an assigned slot (idx >= 0).
 960  *
 961  * It should not be possible to fail adding an existing client - otherwise
 962  * mdt_init_server_data() callsite needs to be fixed.
 963  */
 964 int tgt_client_add(const struct lu_env *env,  struct obd_export *exp, int idx)
 965 {
 966         struct tg_export_data   *ted = &exp->exp_target_data;
 967         struct lu_target        *tgt = class_exp2tgt(exp);
 968
 969         ENTRY;
 970
 971         LASSERT(tgt && tgt->lut_client_bitmap != NULL);
 972         LASSERTF(idx >= 0, "%d\n", idx);
 973
 974         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid) ||
 975             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 976                 RETURN(0);
 977
 978         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 979                 CERROR("%s: client %d: bit already set in bitmap!!\n",
 980                        tgt->lut_obd->obd_name,  idx);
 981                 LBUG();
 982         }
 983         atomic_inc(&tgt->lut_num_clients);
 984
 985         CDEBUG(D_INFO, "%s: client at idx %d with UUID '%s' added, "
 986                "generation %d\n",
 987                tgt->lut_obd->obd_name, idx, ted->ted_lcd->lcd_uuid,
 988                ted->ted_lcd->lcd_generation);
 989
 990         ted->ted_lr_idx = idx;
 991         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
 992                           idx * tgt->lut_lsd.lsd_client_size;
 993
 994         mutex_init(&ted->ted_lcd_lock);
 995
 996         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 997
 998         RETURN(0);
 999 }
1000
1001 int tgt_client_del(const struct lu_env *env, struct obd_export *exp)
1002 {
1003         struct tg_export_data   *ted = &exp->exp_target_data;
1004         struct lu_target        *tgt = class_exp2tgt(exp);
1005         int                      rc;
1006
1007         ENTRY;
1008
1009         LASSERT(ted->ted_lcd);
1010
1011         if (unlikely(tgt == NULL)) {
1012                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
1013                        class_exp2obd(exp)->obd_name);
1014                 RETURN(-EINVAL);
1015         }
1016
1017         /* XXX if lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
1018         if (!strcmp((char *)ted->ted_lcd->lcd_uuid,
1019                     (char *)tgt->lut_obd->obd_uuid.uuid) ||
1020             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
1021                 RETURN(0);
1022
1023         CDEBUG(D_INFO, "%s: del client at idx %u, off %lld, UUID '%s'\n",
1024                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
1025                ted->ted_lcd->lcd_uuid);
1026
1027         /* Clear the bit _after_ zeroing out the client so we don't
1028            race with filter_client_add and zero out new clients.*/
1029         if (!test_bit(ted->ted_lr_idx, tgt->lut_client_bitmap)) {
1030                 CERROR("%s: client %u: bit already clear in bitmap!!\n",
1031                        tgt->lut_obd->obd_name, ted->ted_lr_idx);
1032                 LBUG();
1033         }
1034
1035         /* Do not erase record for recoverable client. */
1036         if (exp->exp_flags & OBD_OPT_FAILOVER)
1037                 RETURN(0);
1038
1039         /* Make sure the server's last_transno is up to date.
1040          * This should be done before zeroing client slot so last_transno will
1041          * be in server data or in client data in case of failure */
1042         rc = tgt_server_data_update(env, tgt, 0);
1043         if (rc != 0) {
1044                 CERROR("%s: failed to update server data, skip client %s "
1045                        "zeroing, rc %d\n", tgt->lut_obd->obd_name,
1046                        ted->ted_lcd->lcd_uuid, rc);
1047                 RETURN(rc);
1048         }
1049
1050         mutex_lock(&ted->ted_lcd_lock);
1051         memset(ted->ted_lcd->lcd_uuid, 0, sizeof ted->ted_lcd->lcd_uuid);
1052         rc = tgt_client_data_update(env, exp);
1053         mutex_unlock(&ted->ted_lcd_lock);
1054
1055         CDEBUG(rc == 0 ? D_INFO : D_ERROR,
1056                "%s: zeroing out client %s at idx %u (%llu), rc %d\n",
1057                tgt->lut_obd->obd_name, ted->ted_lcd->lcd_uuid,
1058                ted->ted_lr_idx, ted->ted_lr_off, rc);
1059         RETURN(rc);
1060 }
1061 EXPORT_SYMBOL(tgt_client_del);
1062
1063 /*
1064  * last_rcvd & last_committed update callbacks
1065  */
1066 static int tgt_last_rcvd_update(const struct lu_env *env, struct lu_target *tgt,
1067                                 struct dt_object *obj, __u64 opdata,
1068                                 struct thandle *th, struct ptlrpc_request *req)
1069 {
1070         struct tgt_thread_info  *tti = tgt_th_info(env);
1071         struct tg_export_data   *ted;
1072         __u64                   *transno_p;
1073         int                      rc = 0;
1074         bool                     lw_client, update = false;
1075
1076         ENTRY;
1077
1078         ted = &req->rq_export->exp_target_data;
1079
1080         lw_client = exp_connect_flags(req->rq_export) & OBD_CONNECT_LIGHTWEIGHT;
1081         if (ted->ted_lr_idx < 0 && !lw_client)
1082                 /* ofd connect may cause transaction before export has
1083                  * last_rcvd slot */
1084                 RETURN(0);
1085
1086         tti->tti_transno = lustre_msg_get_transno(req->rq_reqmsg);
1087
1088         spin_lock(&tgt->lut_translock);
1089         if (th->th_result != 0) {
1090                 if (tti->tti_transno != 0) {
1091                         CERROR("%s: replay transno "LPU64" failed: rc = %d\n",
1092                                tgt_name(tgt), tti->tti_transno, th->th_result);
1093                 }
1094         } else if (tti->tti_transno == 0) {
1095                 tti->tti_transno = ++tgt->lut_last_transno;
1096         } else {
1097                 /* should be replay */
1098                 if (tti->tti_transno > tgt->lut_last_transno)
1099                         tgt->lut_last_transno = tti->tti_transno;
1100         }
1101         spin_unlock(&tgt->lut_translock);
1102
1103         /** VBR: set new versions */
1104         if (th->th_result == 0 && obj != NULL) {
1105                 struct dt_object *dto = dt_object_locate(obj, th->th_dev);
1106                 dt_version_set(env, dto, tti->tti_transno, th);
1107         }
1108
1109         /* filling reply data */
1110         CDEBUG(D_INODE, "transno = "LPU64", last_committed = "LPU64"\n",
1111                tti->tti_transno, tgt->lut_obd->obd_last_committed);
1112
1113         req->rq_transno = tti->tti_transno;
1114         lustre_msg_set_transno(req->rq_repmsg, tti->tti_transno);
1115
1116         /* if can't add callback, do sync write */
1117         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, req->rq_export,
1118                                                 tti->tti_transno);
1119
1120         if (lw_client) {
1121                 /* All operations performed by LW clients are synchronous and
1122                  * we store the committed transno in the last_rcvd header */
1123                 spin_lock(&tgt->lut_translock);
1124                 if (tti->tti_transno > tgt->lut_lsd.lsd_last_transno) {
1125                         tgt->lut_lsd.lsd_last_transno = tti->tti_transno;
1126                         update = true;
1127                 }
1128                 spin_unlock(&tgt->lut_translock);
1129                 /* Although lightweight (LW) connections have no slot in
1130                  * last_rcvd, we still want to maintain the in-memory
1131                  * lsd_client_data structure in order to properly handle reply
1132                  * reconstruction. */
1133         } else if (ted->ted_lr_off == 0) {
1134                 CERROR("%s: client idx %d has offset %lld\n",
1135                        tgt_name(tgt), ted->ted_lr_idx, ted->ted_lr_off);
1136                 RETURN(-EINVAL);
1137         }
1138
1139         /* if the export has already been disconnected, we have no last_rcvd
1140          * slot, update server data with latest transno then */
1141         if (ted->ted_lcd == NULL) {
1142                 CWARN("commit transaction for disconnected client %s: rc %d\n",
1143                       req->rq_export->exp_client_uuid.uuid, rc);
1144                 GOTO(srv_update, rc = 0);
1145         }
1146
1147         /* Target that supports multiple reply data */
1148         if (tgt_is_multimodrpcs_client(req->rq_export)) {
1149                 struct tg_reply_data    *trd;
1150                 struct lsd_reply_data   *lrd;
1151                 __u64                   *pre_versions;
1152                 int                      i;
1153                 loff_t                   off;
1154
1155                 OBD_ALLOC_PTR(trd);
1156                 if (unlikely(trd == NULL))
1157                         GOTO(srv_update, rc = -ENOMEM);
1158
1159                 /* update export last transno */
1160                 mutex_lock(&ted->ted_lcd_lock);
1161                 if (tti->tti_transno > ted->ted_lcd->lcd_last_transno)
1162                         ted->ted_lcd->lcd_last_transno = tti->tti_transno;
1163                 mutex_unlock(&ted->ted_lcd_lock);
1164
1165                 /* fill reply data information */
1166                 lrd = &trd->trd_reply;
1167                 lrd->lrd_transno = tti->tti_transno;
1168                 lrd->lrd_xid = req->rq_xid;
1169                 lrd->lrd_result = th->th_result;
1170                 lrd->lrd_data = opdata;
1171                 lrd->lrd_client_gen = ted->ted_lcd->lcd_generation;
1172                 trd->trd_tag = lustre_msg_get_tag(req->rq_reqmsg);
1173                 pre_versions = lustre_msg_get_versions(req->rq_repmsg);
1174                 if (pre_versions) {
1175                         trd->trd_pre_versions[0] = pre_versions[0];
1176                         trd->trd_pre_versions[1] = pre_versions[1];
1177                         trd->trd_pre_versions[2] = pre_versions[2];
1178                         trd->trd_pre_versions[3] = pre_versions[3];
1179                 }
1180
1181                 /* find a empty slot */
1182                 i = tgt_find_free_reply_slot(tgt);
1183                 if (unlikely(i < 0)) {
1184                         CERROR("%s: couldn't find a slot for reply data: "
1185                                "rc = %d\n", tgt_name(tgt), i);
1186                         GOTO(srv_update, rc = i);
1187                 }
1188                 trd->trd_index = i;
1189
1190                 /* write reply data to disk */
1191                 off = sizeof(struct lsd_reply_header) + sizeof(*lrd) * i;
1192                 rc = tgt_reply_data_write(env, tgt, lrd, off, th);
1193                 if (unlikely(rc != 0)) {
1194                         CERROR("%s: can't update %s file: rc = %d\n",
1195                                tgt_name(tgt), REPLY_DATA, rc);
1196                         RETURN(rc);
1197                 }
1198
1199                 /* add reply data to target export's reply list */
1200                 mutex_lock(&ted->ted_lcd_lock);
1201                 list_add(&trd->trd_list, &ted->ted_reply_list);
1202                 ted->ted_reply_cnt++;
1203                 if (ted->ted_reply_cnt > ted->ted_reply_max)
1204                         ted->ted_reply_max = ted->ted_reply_cnt;
1205                 mutex_unlock(&ted->ted_lcd_lock);
1206
1207                 CDEBUG(D_TRACE, "add reply %p: xid %llu, transno %llu, "
1208                        "tag %hu, client gen %u, slot idx %d\n",
1209                        trd, lrd->lrd_xid, lrd->lrd_transno,
1210                        trd->trd_tag, lrd->lrd_client_gen, i);
1211
1212                 GOTO(srv_update, rc = 0);
1213         }
1214
1215         mutex_lock(&ted->ted_lcd_lock);
1216         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
1217         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE) {
1218                 transno_p = &ted->ted_lcd->lcd_last_close_transno;
1219                 ted->ted_lcd->lcd_last_close_xid = req->rq_xid;
1220                 ted->ted_lcd->lcd_last_close_result = th->th_result;
1221         } else {
1222                 /* VBR: save versions in last_rcvd for reconstruct. */
1223                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
1224
1225                 if (pre_versions) {
1226                         ted->ted_lcd->lcd_pre_versions[0] = pre_versions[0];
1227                         ted->ted_lcd->lcd_pre_versions[1] = pre_versions[1];
1228                         ted->ted_lcd->lcd_pre_versions[2] = pre_versions[2];
1229                         ted->ted_lcd->lcd_pre_versions[3] = pre_versions[3];
1230                 }
1231                 transno_p = &ted->ted_lcd->lcd_last_transno;
1232                 ted->ted_lcd->lcd_last_xid = req->rq_xid;
1233                 ted->ted_lcd->lcd_last_result = th->th_result;
1234                 /* XXX: lcd_last_data is __u32 but intent_dispostion is __u64,
1235                  * see struct ldlm_reply->lock_policy_res1; */
1236                 ted->ted_lcd->lcd_last_data = opdata;
1237         }
1238
1239         /* Update transno in slot only if non-zero number, i.e. no errors */
1240         if (likely(tti->tti_transno != 0)) {
1241                 if (*transno_p > tti->tti_transno &&
1242                     !tgt->lut_no_reconstruct) {
1243                         CERROR("%s: trying to overwrite bigger transno:"
1244                                "on-disk: "LPU64", new: "LPU64" replay: %d. "
1245                                "see LU-617.\n", tgt_name(tgt), *transno_p,
1246                                tti->tti_transno, req_is_replay(req));
1247                         if (req_is_replay(req)) {
1248                                 spin_lock(&req->rq_export->exp_lock);
1249                                 req->rq_export->exp_vbr_failed = 1;
1250                                 spin_unlock(&req->rq_export->exp_lock);
1251                         }
1252                         mutex_unlock(&ted->ted_lcd_lock);
1253                         RETURN(req_is_replay(req) ? -EOVERFLOW : 0);
1254                 }
1255                 *transno_p = tti->tti_transno;
1256         }
1257
1258         if (!lw_client) {
1259                 tti->tti_off = ted->ted_lr_off;
1260                 rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
1261                 if (rc < 0) {
1262                         mutex_unlock(&ted->ted_lcd_lock);
1263                         RETURN(rc);
1264                 }
1265         }
1266         mutex_unlock(&ted->ted_lcd_lock);
1267         EXIT;
1268 srv_update:
1269         if (update)
1270                 rc = tgt_server_data_write(env, tgt, th);
1271         return rc;
1272 }
1273
1274 /*
1275  * last_rcvd update for echo client simulation.
1276  * It updates last_rcvd client slot and version of object in
1277  * simple way but with all locks to simulate all drawbacks
1278  */
1279 static int tgt_last_rcvd_update_echo(const struct lu_env *env,
1280                                      struct lu_target *tgt,
1281                                      struct dt_object *obj,
1282                                      struct thandle *th,
1283                                      struct obd_export *exp)
1284 {
1285         struct tgt_thread_info  *tti = tgt_th_info(env);
1286         struct tg_export_data   *ted = &exp->exp_target_data;
1287         int                      rc = 0;
1288
1289         ENTRY;
1290
1291         tti->tti_transno = 0;
1292
1293         spin_lock(&tgt->lut_translock);
1294         if (th->th_result == 0)
1295                 tti->tti_transno = ++tgt->lut_last_transno;
1296         spin_unlock(&tgt->lut_translock);
1297
1298         /** VBR: set new versions */
1299         if (th->th_result == 0 && obj != NULL)
1300                 dt_version_set(env, obj, tti->tti_transno, th);
1301
1302         /* if can't add callback, do sync write */
1303         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, exp,
1304                                                 tti->tti_transno);
1305
1306         LASSERT(ted->ted_lr_off > 0);
1307
1308         mutex_lock(&ted->ted_lcd_lock);
1309         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
1310         ted->ted_lcd->lcd_last_transno = tti->tti_transno;
1311         ted->ted_lcd->lcd_last_result = th->th_result;
1312
1313         tti->tti_off = ted->ted_lr_off;
1314         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
1315         mutex_unlock(&ted->ted_lcd_lock);
1316         RETURN(rc);
1317 }
1318
1319 static int tgt_clients_data_init(const struct lu_env *env,
1320                                  struct lu_target *tgt,
1321                                  unsigned long last_size)
1322 {
1323         struct obd_device       *obd = tgt->lut_obd;
1324         struct lr_server_data   *lsd = &tgt->lut_lsd;
1325         struct lsd_client_data  *lcd = NULL;
1326         struct tg_export_data   *ted;
1327         int                      cl_idx;
1328         int                      rc = 0;
1329         loff_t                   off = lsd->lsd_client_start;
1330         __u32                    generation = 0;
1331         struct cfs_hash         *hash = NULL;
1332
1333         ENTRY;
1334
1335         CLASSERT(offsetof(struct lsd_client_data, lcd_padding) +
1336                  sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
1337
1338         OBD_ALLOC_PTR(lcd);
1339         if (lcd == NULL)
1340                 RETURN(-ENOMEM);
1341
1342         hash = cfs_hash_getref(tgt->lut_obd->obd_gen_hash);
1343         if (hash == NULL)
1344                 GOTO(err_out, rc = -ENODEV);
1345
1346         for (cl_idx = 0; off < last_size; cl_idx++) {
1347                 struct obd_export       *exp;
1348                 __u64                    last_transno;
1349
1350                 /* Don't assume off is incremented properly by
1351                  * read_record(), in case sizeof(*lcd)
1352                  * isn't the same as fsd->lsd_client_size.  */
1353                 off = lsd->lsd_client_start + cl_idx * lsd->lsd_client_size;
1354                 rc = tgt_client_data_read(env, tgt, lcd, &off, cl_idx);
1355                 if (rc) {
1356                         CERROR("%s: error reading last_rcvd %s idx %d off "
1357                                "%llu: rc = %d\n", tgt_name(tgt), LAST_RCVD,
1358                                cl_idx, off, rc);
1359                         rc = 0;
1360                         break; /* read error shouldn't cause startup to fail */
1361                 }
1362
1363                 if (lcd->lcd_uuid[0] == '\0') {
1364                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
1365                                cl_idx);
1366                         continue;
1367                 }
1368
1369                 last_transno = lcd_last_transno(lcd);
1370
1371                 /* These exports are cleaned up by disconnect, so they
1372                  * need to be set up like real exports as connect does.
1373                  */
1374                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
1375                        " srv lr: "LPU64" lx: "LPU64" gen %u\n", lcd->lcd_uuid,
1376                        cl_idx, last_transno, lsd->lsd_last_transno,
1377                        lcd_last_xid(lcd), lcd->lcd_generation);
1378
1379                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
1380                 if (IS_ERR(exp)) {
1381                         if (PTR_ERR(exp) == -EALREADY) {
1382                                 /* export already exists, zero out this one */
1383                                 CERROR("%s: Duplicate export %s!\n",
1384                                        tgt_name(tgt), lcd->lcd_uuid);
1385                                 continue;
1386                         }
1387                         GOTO(err_out, rc = PTR_ERR(exp));
1388                 }
1389
1390                 ted = &exp->exp_target_data;
1391                 *ted->ted_lcd = *lcd;
1392
1393                 rc = tgt_client_add(env, exp, cl_idx);
1394                 LASSERTF(rc == 0, "rc = %d\n", rc); /* can't fail existing */
1395                 /* VBR: set export last committed version */
1396                 exp->exp_last_committed = last_transno;
1397                 spin_lock(&exp->exp_lock);
1398                 exp->exp_connecting = 0;
1399                 exp->exp_in_recovery = 0;
1400                 spin_unlock(&exp->exp_lock);
1401                 obd->obd_max_recoverable_clients++;
1402
1403                 if (tgt->lut_lsd.lsd_feature_incompat &
1404                     OBD_INCOMPAT_MULTI_RPCS &&
1405                     lcd->lcd_generation != 0) {
1406                         /* compute the highest valid client generation */
1407                         generation = max(generation, lcd->lcd_generation);
1408
1409                         /* fill client_generation <-> export hash table */
1410                         rc = cfs_hash_add_unique(hash, &lcd->lcd_generation,
1411                                                  &exp->exp_gen_hash);
1412                         if (rc != 0) {
1413                                 CERROR("%s: duplicate export for client "
1414                                        "generation %u\n",
1415                                        tgt_name(tgt), lcd->lcd_generation);
1416                                 class_export_put(exp);
1417                                 GOTO(err_out, rc);
1418                         }
1419                 }
1420
1421                 class_export_put(exp);
1422
1423                 /* Need to check last_rcvd even for duplicated exports. */
1424                 CDEBUG(D_OTHER, "client at idx %d has last_transno = "LPU64"\n",
1425                        cl_idx, last_transno);
1426
1427                 spin_lock(&tgt->lut_translock);
1428                 tgt->lut_last_transno = max(last_transno,
1429                                             tgt->lut_last_transno);
1430                 spin_unlock(&tgt->lut_translock);
1431         }
1432
1433         /* record highest valid client generation */
1434         atomic_set(&tgt->lut_client_generation, generation);
1435
1436 err_out:
1437         if (hash != NULL)
1438                 cfs_hash_putref(hash);
1439         OBD_FREE_PTR(lcd);
1440         RETURN(rc);
1441 }
1442
1443 struct server_compat_data {
1444         __u32 rocompat;
1445         __u32 incompat;
1446         __u32 rocinit;
1447         __u32 incinit;
1448 };
1449
1450 static struct server_compat_data tgt_scd[] = {
1451         [LDD_F_SV_TYPE_MDT] = {
1452                 .rocompat = OBD_ROCOMPAT_LOVOBJID,
1453                 .incompat = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
1454                             OBD_INCOMPAT_FID | OBD_INCOMPAT_IAM_DIR |
1455                             OBD_INCOMPAT_LMM_VER | OBD_INCOMPAT_MULTI_OI |
1456                             OBD_INCOMPAT_MULTI_RPCS,
1457                 .rocinit = OBD_ROCOMPAT_LOVOBJID,
1458                 .incinit = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
1459                            OBD_INCOMPAT_MULTI_OI,
1460         },
1461         [LDD_F_SV_TYPE_OST] = {
1462                 .rocompat = OBD_ROCOMPAT_IDX_IN_IDIF,
1463                 .incompat = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR |
1464                             OBD_INCOMPAT_FID,
1465                 .rocinit = OBD_ROCOMPAT_IDX_IN_IDIF,
1466                 .incinit = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR,
1467         }
1468 };
1469
1470 int tgt_server_data_init(const struct lu_env *env, struct lu_target *tgt)
1471 {
1472         struct tgt_thread_info          *tti = tgt_th_info(env);
1473         struct lr_server_data           *lsd = &tgt->lut_lsd;
1474         unsigned long                    last_rcvd_size;
1475         __u32                            index;
1476         int                              rc, type;
1477
1478         rc = dt_attr_get(env, tgt->lut_last_rcvd, &tti->tti_attr);
1479         if (rc)
1480                 RETURN(rc);
1481
1482         last_rcvd_size = (unsigned long)tti->tti_attr.la_size;
1483
1484         /* ensure padding in the struct is the correct size */
1485         CLASSERT(offsetof(struct lr_server_data, lsd_padding) +
1486                  sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
1487
1488         rc = server_name2index(tgt_name(tgt), &index, NULL);
1489         if (rc < 0) {
1490                 CERROR("%s: Can not get index from name: rc = %d\n",
1491                        tgt_name(tgt), rc);
1492                 RETURN(rc);
1493         }
1494         /* server_name2index() returns type */
1495         type = rc;
1496         if (type != LDD_F_SV_TYPE_MDT && type != LDD_F_SV_TYPE_OST) {
1497                 CERROR("%s: unknown target type %x\n", tgt_name(tgt), type);
1498                 RETURN(-EINVAL);
1499         }
1500
1501         /* last_rcvd on OST doesn't provide reconstruct support because there
1502          * may be up to 8 in-flight write requests per single slot in
1503          * last_rcvd client data
1504          */
1505         tgt->lut_no_reconstruct = (type == LDD_F_SV_TYPE_OST);
1506
1507         if (last_rcvd_size == 0) {
1508                 LCONSOLE_WARN("%s: new disk, initializing\n", tgt_name(tgt));
1509
1510                 memcpy(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid,
1511                        sizeof(lsd->lsd_uuid));
1512                 lsd->lsd_last_transno = 0;
1513                 lsd->lsd_mount_count = 0;
1514                 lsd->lsd_server_size = LR_SERVER_SIZE;
1515                 lsd->lsd_client_start = LR_CLIENT_START;
1516                 lsd->lsd_client_size = LR_CLIENT_SIZE;
1517                 lsd->lsd_subdir_count = OBJ_SUBDIR_COUNT;
1518                 lsd->lsd_osd_index = index;
1519                 lsd->lsd_feature_rocompat = tgt_scd[type].rocinit;
1520                 lsd->lsd_feature_incompat = tgt_scd[type].incinit;
1521         } else {
1522                 rc = tgt_server_data_read(env, tgt);
1523                 if (rc) {
1524                         CERROR("%s: error reading LAST_RCVD: rc= %d\n",
1525                                tgt_name(tgt), rc);
1526                         RETURN(rc);
1527                 }
1528                 if (strcmp(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid)) {
1529                         LCONSOLE_ERROR_MSG(0x157, "Trying to start OBD %s "
1530                                            "using the wrong disk %s. Were the"
1531                                            " /dev/ assignments rearranged?\n",
1532                                            tgt->lut_obd->obd_uuid.uuid,
1533                                            lsd->lsd_uuid);
1534                         RETURN(-EINVAL);
1535                 }
1536
1537                 if (lsd->lsd_osd_index != index) {
1538                         LCONSOLE_ERROR_MSG(0x157, "%s: index %d in last rcvd "
1539                                            "is different with the index %d in"
1540                                            "config log, It might be disk"
1541                                            "corruption!\n", tgt_name(tgt),
1542                                            lsd->lsd_osd_index, index);
1543                         RETURN(-EINVAL);
1544                 }
1545         }
1546
1547         if (lsd->lsd_feature_incompat & ~tgt_scd[type].incompat) {
1548                 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
1549                        tgt_name(tgt),
1550                        lsd->lsd_feature_incompat & ~tgt_scd[type].incompat);
1551                 RETURN(-EINVAL);
1552         }
1553
1554         if (type == LDD_F_SV_TYPE_MDT)
1555                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
1556
1557         if (lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat) {
1558                 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
1559                        tgt_name(tgt),
1560                        lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat);
1561                 RETURN(-EINVAL);
1562         }
1563         /** Interop: evict all clients at first boot with 1.8 last_rcvd */
1564         if (type == LDD_F_SV_TYPE_MDT &&
1565             !(lsd->lsd_feature_compat & OBD_COMPAT_20)) {
1566                 if (last_rcvd_size > lsd->lsd_client_start) {
1567                         LCONSOLE_WARN("%s: mounting at first time on 1.8 FS, "
1568                                       "remove all clients for interop needs\n",
1569                                       tgt_name(tgt));
1570                         rc = tgt_truncate_last_rcvd(env, tgt,
1571                                                     lsd->lsd_client_start);
1572                         if (rc)
1573                                 RETURN(rc);
1574                         last_rcvd_size = lsd->lsd_client_start;
1575                 }
1576                 /** set 2.0 flag to upgrade/downgrade between 1.8 and 2.0 */
1577                 lsd->lsd_feature_compat |= OBD_COMPAT_20;
1578         }
1579
1580         spin_lock(&tgt->lut_translock);
1581         tgt->lut_last_transno = lsd->lsd_last_transno;
1582         spin_unlock(&tgt->lut_translock);
1583
1584         lsd->lsd_mount_count++;
1585
1586         CDEBUG(D_INODE, "=======,=BEGIN DUMPING LAST_RCVD========\n");
1587         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
1588                tgt_name(tgt), tgt->lut_last_transno);
1589         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
1590                tgt_name(tgt), lsd->lsd_mount_count);
1591         CDEBUG(D_INODE, "%s: server data size: %u\n",
1592                tgt_name(tgt), lsd->lsd_server_size);
1593         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
1594                tgt_name(tgt), lsd->lsd_client_start);
1595         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
1596                tgt_name(tgt), lsd->lsd_client_size);
1597         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
1598                tgt_name(tgt), last_rcvd_size);
1599         CDEBUG(D_INODE, "%s: server subdir_count: %u\n",
1600                tgt_name(tgt), lsd->lsd_subdir_count);
1601         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", tgt_name(tgt),
1602                last_rcvd_size <= lsd->lsd_client_start ? 0 :
1603                (last_rcvd_size - lsd->lsd_client_start) /
1604                 lsd->lsd_client_size);
1605         CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
1606
1607         if (lsd->lsd_server_size == 0 || lsd->lsd_client_start == 0 ||
1608             lsd->lsd_client_size == 0) {
1609                 CERROR("%s: bad last_rcvd contents!\n", tgt_name(tgt));
1610                 RETURN(-EINVAL);
1611         }
1612
1613         if (!tgt->lut_obd->obd_replayable)
1614                 CWARN("%s: recovery support OFF\n", tgt_name(tgt));
1615
1616         rc = tgt_clients_data_init(env, tgt, last_rcvd_size);
1617         if (rc < 0)
1618                 GOTO(err_client, rc);
1619
1620         spin_lock(&tgt->lut_translock);
1621         /* obd_last_committed is used for compatibility
1622          * with other lustre recovery code */
1623         tgt->lut_obd->obd_last_committed = tgt->lut_last_transno;
1624         spin_unlock(&tgt->lut_translock);
1625
1626         tgt->lut_obd->u.obt.obt_mount_count = lsd->lsd_mount_count;
1627         tgt->lut_obd->u.obt.obt_instance = (__u32)lsd->lsd_mount_count;
1628
1629         /* save it, so mount count and last_transno is current */
1630         rc = tgt_server_data_update(env, tgt, 0);
1631         if (rc < 0)
1632                 GOTO(err_client, rc);
1633
1634         RETURN(0);
1635
1636 err_client:
1637         class_disconnect_exports(tgt->lut_obd);
1638         return rc;
1639 }
1640
1641 /* add credits for last_rcvd update */
1642 int tgt_txn_start_cb(const struct lu_env *env, struct thandle *th,
1643                      void *cookie)
1644 {
1645         struct lu_target        *tgt = cookie;
1646         struct tgt_session_info *tsi;
1647         struct tgt_thread_info  *tti = tgt_th_info(env);
1648         struct dt_object        *dto;
1649         int                      rc;
1650
1651         /* if there is no session, then this transaction is not result of
1652          * request processing but some local operation */
1653         if (env->le_ses == NULL)
1654                 return 0;
1655
1656         LASSERT(tgt->lut_last_rcvd);
1657         tsi = tgt_ses_info(env);
1658         /* OFD may start transaction without export assigned */
1659         if (tsi->tsi_exp == NULL)
1660                 return 0;
1661
1662         dto = dt_object_locate(tgt->lut_last_rcvd, th->th_dev);
1663         tti_buf_lcd(tti);
1664
1665         rc = dt_declare_record_write(env, dto, &tti->tti_buf,
1666                                      tsi->tsi_exp->exp_target_data.ted_lr_off,
1667                                      th);
1668         if (rc)
1669                 return rc;
1670
1671         tti_buf_lsd(tti);
1672         rc = dt_declare_record_write(env, dto, &tti->tti_buf, 0, th);
1673         if (rc)
1674                 return rc;
1675
1676         if (tsi->tsi_vbr_obj != NULL &&
1677             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu)) {
1678                 dto = dt_object_locate(tsi->tsi_vbr_obj, th->th_dev);
1679                 rc = dt_declare_version_set(env, dto, th);
1680         }
1681
1682         return rc;
1683 }
1684
1685 /* Update last_rcvd records with latests transaction data */
1686 int tgt_txn_stop_cb(const struct lu_env *env, struct thandle *th,
1687                     void *cookie)
1688 {
1689         struct lu_target        *tgt = cookie;
1690         struct tgt_session_info *tsi;
1691         struct tgt_thread_info  *tti = tgt_th_info(env);
1692         struct dt_object        *obj = NULL;
1693         int                      rc;
1694         bool                     echo_client;
1695
1696         if (env->le_ses == NULL)
1697                 return 0;
1698
1699         tsi = tgt_ses_info(env);
1700         /* OFD may start transaction without export assigned */
1701         if (tsi->tsi_exp == NULL)
1702                 return 0;
1703
1704         echo_client = (tgt_ses_req(tsi) == NULL);
1705
1706         if (tti->tti_has_trans && !echo_client) {
1707                 if (tti->tti_mult_trans == 0) {
1708                         CDEBUG(D_HA, "More than one transaction "LPU64"\n",
1709                                tti->tti_transno);
1710                         RETURN(0);
1711                 }
1712                 /* we need another transno to be assigned */
1713                 tti->tti_transno = 0;
1714         } else if (th->th_result == 0) {
1715                 tti->tti_has_trans = 1;
1716         }
1717
1718         if (tsi->tsi_vbr_obj != NULL &&
1719             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu)) {
1720                 obj = tsi->tsi_vbr_obj;
1721         }
1722
1723         if (unlikely(echo_client)) /* echo client special case */
1724                 rc = tgt_last_rcvd_update_echo(env, tgt, obj, th,
1725                                                tsi->tsi_exp);
1726         else
1727                 rc = tgt_last_rcvd_update(env, tgt, obj, tsi->tsi_opdata, th,
1728                                           tgt_ses_req(tsi));
1729         return rc;
1730 }
1731
1732 int tgt_reply_data_init(const struct lu_env *env, struct lu_target *tgt)
1733 {
1734         struct tgt_thread_info  *tti = tgt_th_info(env);
1735         struct lsd_reply_data   *lrd = &tti->tti_lrd;
1736         unsigned long            reply_data_size;
1737         int                      rc;
1738         struct lsd_reply_header *lrh = NULL;
1739         struct lsd_client_data  *lcd = NULL;
1740         struct tg_reply_data    *trd = NULL;
1741         int                      idx;
1742         loff_t                   off;
1743         struct cfs_hash         *hash = NULL;
1744         struct obd_export       *exp;
1745         struct obd_export       *tmp;
1746         struct tg_export_data   *ted;
1747         int                      reply_data_recovered = 0;
1748
1749         rc = dt_attr_get(env, tgt->lut_reply_data, &tti->tti_attr);
1750         if (rc)
1751                 GOTO(out, rc);
1752         reply_data_size = (unsigned long)tti->tti_attr.la_size;
1753
1754         OBD_ALLOC_PTR(lrh);
1755         if (lrh == NULL)
1756                 GOTO(out, rc = -ENOMEM);
1757
1758         if (reply_data_size == 0) {
1759                 CDEBUG(D_INFO, "%s: new reply_data file, initializing\n",
1760                        tgt_name(tgt));
1761                 lrh->lrh_magic = LRH_MAGIC;
1762                 lrh->lrh_header_size = sizeof(struct lsd_reply_header);
1763                 lrh->lrh_reply_size = sizeof(struct lsd_reply_data);
1764                 rc = tgt_reply_header_write(env, tgt, lrh);
1765                 if (rc) {
1766                         CERROR("%s: error writing %s: rc = %d\n",
1767                                tgt_name(tgt), REPLY_DATA, rc);
1768                         GOTO(out, rc);
1769                 }
1770         } else {
1771                 rc = tgt_reply_header_read(env, tgt, lrh);
1772                 if (rc) {
1773                         CERROR("%s: error reading %s: rc = %d\n",
1774                                tgt_name(tgt), REPLY_DATA, rc);
1775                         GOTO(out, rc);
1776                 }
1777                 if (lrh->lrh_magic != LRH_MAGIC ||
1778                     lrh->lrh_header_size != sizeof(struct lsd_reply_header) ||
1779                     lrh->lrh_reply_size != sizeof(struct lsd_reply_data)) {
1780                         CERROR("%s: invalid header in %s\n",
1781                                tgt_name(tgt), REPLY_DATA);
1782                         GOTO(out, rc = -EINVAL);
1783                 }
1784
1785                 hash = cfs_hash_getref(tgt->lut_obd->obd_gen_hash);
1786                 if (hash == NULL)
1787                         GOTO(out, rc = -ENODEV);
1788
1789                 OBD_ALLOC_PTR(lcd);
1790                 if (lcd == NULL)
1791                         GOTO(out, rc = -ENOMEM);
1792
1793                 OBD_ALLOC_PTR(trd);
1794                 if (trd == NULL)
1795                         GOTO(out, rc = -ENOMEM);
1796
1797                 /* Load reply_data from disk */
1798                 for (idx = 0, off = sizeof(struct lsd_reply_header);
1799                      off < reply_data_size;
1800                      idx++, off += sizeof(struct lsd_reply_data)) {
1801                         rc = tgt_reply_data_read(env, tgt, lrd, off);
1802                         if (rc) {
1803                                 CERROR("%s: error reading %s: rc = %d\n",
1804                                        tgt_name(tgt), REPLY_DATA, rc);
1805                                 GOTO(out, rc);
1806                         }
1807
1808                         exp = cfs_hash_lookup(hash, &lrd->lrd_client_gen);
1809                         if (exp == NULL) {
1810                                 /* old reply data from a disconnected client */
1811                                 continue;
1812                         }
1813                         ted = &exp->exp_target_data;
1814                         mutex_lock(&ted->ted_lcd_lock);
1815
1816                         /* create in-memory reply_data and link it to
1817                          * target export's reply list */
1818                         tgt_set_reply_slot(tgt, idx);
1819                         trd->trd_reply = *lrd;
1820                         trd->trd_pre_versions[0] = 0;
1821                         trd->trd_pre_versions[1] = 0;
1822                         trd->trd_pre_versions[2] = 0;
1823                         trd->trd_pre_versions[3] = 0;
1824                         trd->trd_index = idx;
1825                         trd->trd_tag = 0;
1826                         list_add(&trd->trd_list, &ted->ted_reply_list);
1827                         ted->ted_reply_cnt++;
1828                         if (ted->ted_reply_cnt > ted->ted_reply_max)
1829                                 ted->ted_reply_max = ted->ted_reply_cnt;
1830
1831                         CDEBUG(D_HA, "%s: restore reply %p: xid %llu, "
1832                                "transno %llu, client gen %u, slot idx %d\n",
1833                                tgt_name(tgt), trd, lrd->lrd_xid,
1834                                lrd->lrd_transno, lrd->lrd_client_gen,
1835                                trd->trd_index);
1836
1837                         /* update export last committed transation */
1838                         exp->exp_last_committed = max(exp->exp_last_committed,
1839                                                       lrd->lrd_transno);
1840
1841                         mutex_unlock(&ted->ted_lcd_lock);
1842                         class_export_put(exp);
1843
1844                         /* update target last committed transaction */
1845                         spin_lock(&tgt->lut_translock);
1846                         tgt->lut_last_transno = max(tgt->lut_last_transno,
1847                                                     lrd->lrd_transno);
1848                         spin_unlock(&tgt->lut_translock);
1849
1850                         reply_data_recovered++;
1851
1852                         OBD_ALLOC_PTR(trd);
1853                         if (trd == NULL)
1854                                 GOTO(out, rc = -ENOMEM);
1855                 }
1856                 CDEBUG(D_INFO, "%s: %d reply data have been recovered\n",
1857                        tgt_name(tgt), reply_data_recovered);
1858
1859                 /* delete entries from client_generation<->export hash */
1860                 spin_lock(&tgt->lut_obd->obd_dev_lock);
1861                 list_for_each_entry_safe(exp, tmp,
1862                                          &tgt->lut_obd->obd_exports,
1863                                          exp_obd_chain) {
1864                         struct tg_export_data *ted = &exp->exp_target_data;
1865
1866                         if (!hlist_unhashed(&exp->exp_gen_hash))
1867                                 cfs_hash_del(hash,
1868                                              &ted->ted_lcd->lcd_generation,
1869                                              &exp->exp_gen_hash);
1870                 }
1871                 spin_unlock(&tgt->lut_obd->obd_dev_lock);
1872         }
1873
1874         spin_lock(&tgt->lut_translock);
1875         /* obd_last_committed is used for compatibility
1876          * with other lustre recovery code */
1877         tgt->lut_obd->obd_last_committed = tgt->lut_last_transno;
1878         spin_unlock(&tgt->lut_translock);
1879
1880         rc = 0;
1881
1882 out:
1883         if (hash != NULL)
1884                 cfs_hash_putref(hash);
1885         if (lcd != NULL)
1886                 OBD_FREE_PTR(lcd);
1887         if (trd != NULL)
1888                 OBD_FREE_PTR(trd);
1889         if (lrh != NULL)
1890                 OBD_FREE_PTR(lrh);
1891         return rc;
1892 }
1893
1894 /* Look for a reply data matching specified request @req
1895  * A copy is returned in @trd if the pointer is not NULL
1896  */
1897 bool tgt_lookup_reply(struct ptlrpc_request *req, struct tg_reply_data *trd)
1898 {
1899         struct tg_export_data   *ted = &req->rq_export->exp_target_data;
1900         struct tg_reply_data    *reply, *tmp;
1901         bool                     found = false;
1902
1903         mutex_lock(&ted->ted_lcd_lock);
1904         list_for_each_entry_safe(reply, tmp, &ted->ted_reply_list, trd_list) {
1905                 if (reply->trd_reply.lrd_xid == req->rq_xid) {
1906                         found = true;
1907                         break;
1908                 }
1909         }
1910         if (found && trd != NULL)
1911                 *trd = *reply;
1912         mutex_unlock(&ted->ted_lcd_lock);
1913
1914         CDEBUG(D_TRACE, "%s: lookup reply xid %llu, found %d\n",
1915                tgt_name(class_exp2tgt(req->rq_export)), req->rq_xid,
1916                found ? 1 : 0);
1917
1918         return found;
1919 }
1920 EXPORT_SYMBOL(tgt_lookup_reply);
1921
1922 int tgt_handle_received_xid(struct obd_export *exp, __u64 rcvd_xid)
1923 {
1924         struct tg_export_data   *ted = &exp->exp_target_data;
1925         struct lu_target        *lut = class_exp2tgt(exp);
1926         struct tg_reply_data    *trd, *tmp;
1927
1928         mutex_lock(&ted->ted_lcd_lock);
1929         list_for_each_entry_safe(trd, tmp, &ted->ted_reply_list, trd_list) {
1930                 if (trd->trd_reply.lrd_xid > rcvd_xid)
1931                         continue;
1932                 ted->ted_release_xid++;
1933                 tgt_release_reply_data(lut, ted, trd);
1934         }
1935         mutex_unlock(&ted->ted_lcd_lock);
1936
1937         return 0;
1938 }
1939
1940 int tgt_handle_tag(struct obd_export *exp, __u16 tag)
1941 {
1942         struct tg_export_data   *ted = &exp->exp_target_data;
1943         struct lu_target        *lut = class_exp2tgt(exp);
1944         struct tg_reply_data    *trd, *tmp;
1945
1946         if (tag == 0)
1947                 return 0;
1948
1949         mutex_lock(&ted->ted_lcd_lock);
1950         list_for_each_entry_safe(trd, tmp, &ted->ted_reply_list, trd_list) {
1951                 if (trd->trd_tag != tag)
1952                         continue;
1953                 ted->ted_release_tag++;
1954                 tgt_release_reply_data(lut, ted, trd);
1955                 break;
1956         }
1957         mutex_unlock(&ted->ted_lcd_lock);
1958
1959         return 0;
1960 }
1961