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_LARGE(bm, BITS_TO_LONGS(LUT_REPLY_SLOTS_PER_CHUNK) *
  54                         sizeof(long));
  55         if (bm == NULL)
  56                 return -ENOMEM;
  57
  58         spin_lock(&lut->lut_client_bitmap_lock);
  59
  60         if (lut->lut_reply_bitmap[chunk] != NULL) {
  61                 /* someone else already allocated the bitmap for this chunk */
  62                 spin_unlock(&lut->lut_client_bitmap_lock);
  63                 OBD_FREE_LARGE(bm, BITS_TO_LONGS(LUT_REPLY_SLOTS_PER_CHUNK) *
  64                          sizeof(long));
  65                 return 0;
  66         }
  67
  68         lut->lut_reply_bitmap[chunk] = bm;
  69
  70         spin_unlock(&lut->lut_client_bitmap_lock);
  71
  72         return 0;
  73 }
  74
  75 /* Look for an available reply data slot in the bitmap
  76  * of the target @lut
  77  * Allocate bitmap chunk when first used
  78  * XXX algo could be improved if this routine limits performance
  79  */
  80 static int tgt_find_free_reply_slot(struct lu_target *lut)
  81 {
  82         unsigned long *bmp;
  83         int chunk = 0;
  84         int rc;
  85         int b;
  86
  87         for (chunk = 0; chunk < LUT_REPLY_SLOTS_MAX_CHUNKS; chunk++) {
  88                 /* allocate the bitmap chunk if necessary */
  89                 if (unlikely(lut->lut_reply_bitmap[chunk] == NULL)) {
  90                         rc = tgt_bitmap_chunk_alloc(lut, chunk);
  91                         if (rc != 0)
  92                                 return rc;
  93                 }
  94                 bmp = lut->lut_reply_bitmap[chunk];
  95
  96                 /* look for an available slot in this chunk */
  97                 do {
  98                         b = find_first_zero_bit(bmp, LUT_REPLY_SLOTS_PER_CHUNK);
  99                         if (b >= LUT_REPLY_SLOTS_PER_CHUNK)
 100                                 break;
 101
 102                         /* found one */
 103                         if (test_and_set_bit(b, bmp) == 0)
 104                                 return chunk * LUT_REPLY_SLOTS_PER_CHUNK + b;
 105                 } while (true);
 106         }
 107
 108         return -ENOSPC;
 109 }
 110
 111 /* Mark the reply data slot @idx 'used' in the corresponding bitmap chunk
 112  * of the target @lut
 113  * Allocate the bitmap chunk if necessary
 114  */
 115 static int tgt_set_reply_slot(struct lu_target *lut, int idx)
 116 {
 117         int chunk;
 118         int b;
 119         int rc;
 120
 121         chunk = idx / LUT_REPLY_SLOTS_PER_CHUNK;
 122         b = idx % LUT_REPLY_SLOTS_PER_CHUNK;
 123
 124         LASSERT(chunk < LUT_REPLY_SLOTS_MAX_CHUNKS);
 125         LASSERT(b < LUT_REPLY_SLOTS_PER_CHUNK);
 126
 127         /* allocate the bitmap chunk if necessary */
 128         if (unlikely(lut->lut_reply_bitmap[chunk] == NULL)) {
 129                 rc = tgt_bitmap_chunk_alloc(lut, chunk);
 130                 if (rc != 0)
 131                         return rc;
 132         }
 133
 134         /* mark the slot 'used' in this chunk */
 135         if (test_and_set_bit(b, lut->lut_reply_bitmap[chunk]) != 0) {
 136                 CERROR("%s: slot %d already set in bitmap\n",
 137                        tgt_name(lut), idx);
 138                 return -EALREADY;
 139         }
 140
 141         return 0;
 142 }
 143
 144
 145 /* Mark the reply data slot @idx 'unused' in the corresponding bitmap chunk
 146  * of the target @lut
 147  */
 148 static int tgt_clear_reply_slot(struct lu_target *lut, int idx)
 149 {
 150         int chunk;
 151         int b;
 152
 153         chunk = idx / LUT_REPLY_SLOTS_PER_CHUNK;
 154         b = idx % LUT_REPLY_SLOTS_PER_CHUNK;
 155
 156         LASSERT(chunk < LUT_REPLY_SLOTS_MAX_CHUNKS);
 157         LASSERT(b < LUT_REPLY_SLOTS_PER_CHUNK);
 158
 159         if (lut->lut_reply_bitmap[chunk] == NULL) {
 160                 CERROR("%s: slot %d not allocated\n",
 161                        tgt_name(lut), idx);
 162                 return -ENOENT;
 163         }
 164
 165         if (test_and_clear_bit(b, lut->lut_reply_bitmap[chunk]) == 0) {
 166                 CERROR("%s: slot %d already clear in bitmap\n",
 167                        tgt_name(lut), idx);
 168                 return -EALREADY;
 169         }
 170
 171         return 0;
 172 }
 173
 174
 175 /* Read header of reply_data file of target @tgt into structure @lrh */
 176 static int tgt_reply_header_read(const struct lu_env *env,
 177                                  struct lu_target *tgt,
 178                                  struct lsd_reply_header *lrh)
 179 {
 180         int                      rc;
 181         struct lsd_reply_header  buf;
 182         struct tgt_thread_info  *tti = tgt_th_info(env);
 183
 184         tti->tti_off = 0;
 185         tti->tti_buf.lb_buf = &buf;
 186         tti->tti_buf.lb_len = sizeof(buf);
 187
 188         rc = dt_record_read(env, tgt->lut_reply_data, &tti->tti_buf,
 189                             &tti->tti_off);
 190         if (rc != 0)
 191                 return rc;
 192
 193         lrh->lrh_magic = le32_to_cpu(buf.lrh_magic);
 194         lrh->lrh_header_size = le32_to_cpu(buf.lrh_header_size);
 195         lrh->lrh_reply_size = le32_to_cpu(buf.lrh_reply_size);
 196
 197         CDEBUG(D_HA, "%s: read %s header. magic=0x%08x "
 198                "header_size=%d reply_size=%d\n",
 199                 tgt->lut_obd->obd_name, REPLY_DATA,
 200                 lrh->lrh_magic, lrh->lrh_header_size, lrh->lrh_reply_size);
 201
 202         return 0;
 203 }
 204
 205 /* Write header into replay_data file of target @tgt from structure @lrh */
 206 static int tgt_reply_header_write(const struct lu_env *env,
 207                                   struct lu_target *tgt,
 208                                   struct lsd_reply_header *lrh)
 209 {
 210         int                      rc;
 211         struct lsd_reply_header  buf;
 212         struct tgt_thread_info  *tti = tgt_th_info(env);
 213         struct thandle          *th;
 214         struct dt_object        *dto;
 215
 216         CDEBUG(D_HA, "%s: write %s header. magic=0x%08x "
 217                "header_size=%d reply_size=%d\n",
 218                 tgt->lut_obd->obd_name, REPLY_DATA,
 219                 lrh->lrh_magic, lrh->lrh_header_size, lrh->lrh_reply_size);
 220
 221         buf.lrh_magic = cpu_to_le32(lrh->lrh_magic);
 222         buf.lrh_header_size = cpu_to_le32(lrh->lrh_header_size);
 223         buf.lrh_reply_size = cpu_to_le32(lrh->lrh_reply_size);
 224
 225         th = dt_trans_create(env, tgt->lut_bottom);
 226         if (IS_ERR(th))
 227                 return PTR_ERR(th);
 228         th->th_sync = 1;
 229
 230         tti->tti_off = 0;
 231         tti->tti_buf.lb_buf = &buf;
 232         tti->tti_buf.lb_len = sizeof(buf);
 233
 234         rc = dt_declare_record_write(env, tgt->lut_reply_data,
 235                                      &tti->tti_buf, tti->tti_off, th);
 236         if (rc)
 237                 GOTO(out, rc);
 238
 239         rc = dt_trans_start(env, tgt->lut_bottom, th);
 240         if (rc)
 241                 GOTO(out, rc);
 242
 243         dto = dt_object_locate(tgt->lut_reply_data, th->th_dev);
 244         rc = dt_record_write(env, dto, &tti->tti_buf, &tti->tti_off, th);
 245 out:
 246         dt_trans_stop(env, tgt->lut_bottom, th);
 247         return rc;
 248 }
 249
 250 /* Write the reply data @lrd into reply_data file of target @tgt
 251  * at offset @off
 252  */
 253 static int tgt_reply_data_write(const struct lu_env *env, struct lu_target *tgt,
 254                                 struct lsd_reply_data *lrd, loff_t off,
 255                                 struct thandle *th)
 256 {
 257         struct tgt_thread_info  *tti = tgt_th_info(env);
 258         struct dt_object        *dto;
 259         struct lsd_reply_data   *buf = &tti->tti_lrd;
 260
 261         lrd->lrd_result = ptlrpc_status_hton(lrd->lrd_result);
 262
 263         buf->lrd_transno         = cpu_to_le64(lrd->lrd_transno);
 264         buf->lrd_xid             = cpu_to_le64(lrd->lrd_xid);
 265         buf->lrd_data            = cpu_to_le64(lrd->lrd_data);
 266         buf->lrd_result          = cpu_to_le32(lrd->lrd_result);
 267         buf->lrd_client_gen      = cpu_to_le32(lrd->lrd_client_gen);
 268
 269         lrd->lrd_result = ptlrpc_status_ntoh(lrd->lrd_result);
 270
 271         tti->tti_off = off;
 272         tti->tti_buf.lb_buf = buf;
 273         tti->tti_buf.lb_len = sizeof(*buf);
 274
 275         dto = dt_object_locate(tgt->lut_reply_data, th->th_dev);
 276         return dt_record_write(env, dto, &tti->tti_buf, &tti->tti_off, th);
 277 }
 278
 279 /* Read the reply data from reply_data file of target @tgt at offset @off
 280  * into structure @lrd
 281  */
 282 static int tgt_reply_data_read(const struct lu_env *env, struct lu_target *tgt,
 283                                struct lsd_reply_data *lrd, loff_t off)
 284 {
 285         int                      rc;
 286         struct tgt_thread_info  *tti = tgt_th_info(env);
 287         struct lsd_reply_data   *buf = &tti->tti_lrd;
 288
 289         tti->tti_off = off;
 290         tti->tti_buf.lb_buf = buf;
 291         tti->tti_buf.lb_len = sizeof(*buf);
 292
 293         rc = dt_record_read(env, tgt->lut_reply_data, &tti->tti_buf,
 294                             &tti->tti_off);
 295         if (rc != 0)
 296                 return rc;
 297
 298         lrd->lrd_transno         = le64_to_cpu(buf->lrd_transno);
 299         lrd->lrd_xid             = le64_to_cpu(buf->lrd_xid);
 300         lrd->lrd_data            = le64_to_cpu(buf->lrd_data);
 301         lrd->lrd_result          = le32_to_cpu(buf->lrd_result);
 302         lrd->lrd_client_gen      = le32_to_cpu(buf->lrd_client_gen);
 303
 304         return 0;
 305 }
 306
 307
 308 /* Free the in-memory reply data structure @trd and release
 309  * the corresponding slot in the reply_data file of target @lut
 310  * Called with ted_lcd_lock held
 311  */
 312 static void tgt_free_reply_data(struct lu_target *lut,
 313                                 struct tg_export_data *ted,
 314                                 struct tg_reply_data *trd)
 315 {
 316         CDEBUG(D_TRACE, "%s: free reply data %p: xid %llu, transno %llu, "
 317                "client gen %u, slot idx %d\n",
 318                lut == NULL ? "" : tgt_name(lut), trd, trd->trd_reply.lrd_xid,
 319                trd->trd_reply.lrd_transno, trd->trd_reply.lrd_client_gen,
 320                trd->trd_index);
 321
 322         LASSERT(mutex_is_locked(&ted->ted_lcd_lock));
 323
 324         list_del(&trd->trd_list);
 325         ted->ted_reply_cnt--;
 326         if (lut != NULL)
 327                 tgt_clear_reply_slot(lut, trd->trd_index);
 328         OBD_FREE_PTR(trd);
 329 }
 330
 331 /* Release the reply data @trd from target @lut
 332  * The reply data with the highest transno for this export
 333  * is retained to ensure correctness of target recovery
 334  * Called with ted_lcd_lock held
 335  */
 336 static void tgt_release_reply_data(struct lu_target *lut,
 337                                    struct tg_export_data *ted,
 338                                    struct tg_reply_data *trd)
 339 {
 340         CDEBUG(D_TRACE, "%s: release reply data %p: xid %llu, transno %llu, "
 341                "client gen %u, slot idx %d\n",
 342                lut == NULL ? "" : tgt_name(lut), trd, trd->trd_reply.lrd_xid,
 343                trd->trd_reply.lrd_transno, trd->trd_reply.lrd_client_gen,
 344                trd->trd_index);
 345
 346         LASSERT(mutex_is_locked(&ted->ted_lcd_lock));
 347
 348         /* Do not free the reply data corresponding to the
 349          * highest transno of this export.
 350          * This ensures on-disk reply data is kept and
 351          * last committed transno can be restored from disk in case
 352          * of target recovery
 353          */
 354         if (trd->trd_reply.lrd_transno == ted->ted_lcd->lcd_last_transno) {
 355                 /* free previous retained reply */
 356                 if (ted->ted_reply_last != NULL)
 357                         tgt_free_reply_data(lut, ted, ted->ted_reply_last);
 358                 /* retain the reply */
 359                 list_del_init(&trd->trd_list);
 360                 ted->ted_reply_last = trd;
 361         } else {
 362                 tgt_free_reply_data(lut, ted, trd);
 363         }
 364 }
 365
 366 static inline struct lu_buf *tti_buf_lsd(struct tgt_thread_info *tti)
 367 {
 368         tti->tti_buf.lb_buf = &tti->tti_lsd;
 369         tti->tti_buf.lb_len = sizeof(tti->tti_lsd);
 370         return &tti->tti_buf;
 371 }
 372
 373 static inline struct lu_buf *tti_buf_lcd(struct tgt_thread_info *tti)
 374 {
 375         tti->tti_buf.lb_buf = &tti->tti_lcd;
 376         tti->tti_buf.lb_len = sizeof(tti->tti_lcd);
 377         return &tti->tti_buf;
 378 }
 379
 380 /**
 381  * Allocate in-memory data for client slot related to export.
 382  */
 383 int tgt_client_alloc(struct obd_export *exp)
 384 {
 385         ENTRY;
 386         LASSERT(exp != exp->exp_obd->obd_self_export);
 387
 388         spin_lock_init(&exp->exp_target_data.ted_nodemap_lock);
 389         INIT_LIST_HEAD(&exp->exp_target_data.ted_nodemap_member);
 390
 391         OBD_ALLOC_PTR(exp->exp_target_data.ted_lcd);
 392         if (exp->exp_target_data.ted_lcd == NULL)
 393                 RETURN(-ENOMEM);
 394         /* Mark that slot is not yet valid, 0 doesn't work here */
 395         exp->exp_target_data.ted_lr_idx = -1;
 396         INIT_LIST_HEAD(&exp->exp_target_data.ted_reply_list);
 397         mutex_init(&exp->exp_target_data.ted_lcd_lock);
 398         RETURN(0);
 399 }
 400 EXPORT_SYMBOL(tgt_client_alloc);
 401
 402 /**
 403  * Free in-memory data for client slot related to export.
 404  */
 405 void tgt_client_free(struct obd_export *exp)
 406 {
 407         struct tg_export_data   *ted = &exp->exp_target_data;
 408         struct lu_target        *lut = class_exp2tgt(exp);
 409         struct tg_reply_data    *trd, *tmp;
 410
 411         LASSERT(exp != exp->exp_obd->obd_self_export);
 412
 413         /* free reply data */
 414         mutex_lock(&ted->ted_lcd_lock);
 415         list_for_each_entry_safe(trd, tmp, &ted->ted_reply_list, trd_list) {
 416                 tgt_release_reply_data(lut, ted, trd);
 417         }
 418         if (ted->ted_reply_last != NULL) {
 419                 tgt_free_reply_data(lut, ted, ted->ted_reply_last);
 420                 ted->ted_reply_last = NULL;
 421         }
 422         mutex_unlock(&ted->ted_lcd_lock);
 423
 424         if (!hlist_unhashed(&exp->exp_gen_hash))
 425                 cfs_hash_del(exp->exp_obd->obd_gen_hash,
 426                              &ted->ted_lcd->lcd_generation,
 427                              &exp->exp_gen_hash);
 428
 429         OBD_FREE_PTR(ted->ted_lcd);
 430         ted->ted_lcd = NULL;
 431
 432         /* Target may have been freed (see LU-7430)
 433          * Slot may be not yet assigned */
 434         if (exp->exp_obd->u.obt.obt_magic != OBT_MAGIC ||
 435             ted->ted_lr_idx < 0)
 436                 return;
 437
 438         /* Clear bit when lcd is freed */
 439         LASSERT(lut && lut->lut_client_bitmap);
 440         if (!test_and_clear_bit(ted->ted_lr_idx, lut->lut_client_bitmap)) {
 441                 CERROR("%s: client %u bit already clear in bitmap\n",
 442                        exp->exp_obd->obd_name, ted->ted_lr_idx);
 443                 LBUG();
 444         }
 445
 446         if (tgt_is_multimodrpcs_client(exp) && !exp->exp_obd->obd_stopping)
 447                 atomic_dec(&lut->lut_num_clients);
 448 }
 449 EXPORT_SYMBOL(tgt_client_free);
 450
 451 int tgt_client_data_read(const struct lu_env *env, struct lu_target *tgt,
 452                          struct lsd_client_data *lcd, loff_t *off, int index)
 453 {
 454         struct tgt_thread_info  *tti = tgt_th_info(env);
 455         int                      rc;
 456
 457         tti_buf_lcd(tti);
 458         rc = dt_record_read(env, tgt->lut_last_rcvd, &tti->tti_buf, off);
 459         if (rc == 0) {
 460                 check_lcd(tgt->lut_obd->obd_name, index, &tti->tti_lcd);
 461                 lcd_le_to_cpu(&tti->tti_lcd, lcd);
 462                 lcd->lcd_last_result = ptlrpc_status_ntoh(lcd->lcd_last_result);
 463                 lcd->lcd_last_close_result =
 464                         ptlrpc_status_ntoh(lcd->lcd_last_close_result);
 465         }
 466
 467         CDEBUG(D_INFO, "%s: read lcd @%lld uuid = %s, last_transno = "LPU64
 468                ", last_xid = "LPU64", last_result = %u, last_data = %u, "
 469                "last_close_transno = "LPU64", last_close_xid = "LPU64", "
 470                "last_close_result = %u, rc = %d\n", tgt->lut_obd->obd_name,
 471                *off, lcd->lcd_uuid, lcd->lcd_last_transno, lcd->lcd_last_xid,
 472                lcd->lcd_last_result, lcd->lcd_last_data,
 473                lcd->lcd_last_close_transno, lcd->lcd_last_close_xid,
 474                lcd->lcd_last_close_result, rc);
 475         return rc;
 476 }
 477
 478 int tgt_client_data_write(const struct lu_env *env, struct lu_target *tgt,
 479                           struct lsd_client_data *lcd, loff_t *off,
 480                           struct thandle *th)
 481 {
 482         struct tgt_thread_info *tti = tgt_th_info(env);
 483         struct dt_object        *dto;
 484
 485         lcd->lcd_last_result = ptlrpc_status_hton(lcd->lcd_last_result);
 486         lcd->lcd_last_close_result =
 487                 ptlrpc_status_hton(lcd->lcd_last_close_result);
 488         lcd_cpu_to_le(lcd, &tti->tti_lcd);
 489         tti_buf_lcd(tti);
 490
 491         dto = dt_object_locate(tgt->lut_last_rcvd, th->th_dev);
 492         return dt_record_write(env, dto, &tti->tti_buf, off, th);
 493 }
 494
 495 /**
 496  * Update client data in last_rcvd
 497  */
 498 static int tgt_client_data_update(const struct lu_env *env,
 499                                   struct obd_export *exp)
 500 {
 501         struct tg_export_data   *ted = &exp->exp_target_data;
 502         struct lu_target        *tgt = class_exp2tgt(exp);
 503         struct tgt_thread_info  *tti = tgt_th_info(env);
 504         struct thandle          *th;
 505         int                      rc = 0;
 506
 507         ENTRY;
 508
 509         if (unlikely(tgt == NULL)) {
 510                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
 511                           class_exp2obd(exp)->obd_name);
 512                 RETURN(-EINVAL);
 513         }
 514
 515         th = dt_trans_create(env, tgt->lut_bottom);
 516         if (IS_ERR(th))
 517                 RETURN(PTR_ERR(th));
 518
 519         tti_buf_lcd(tti);
 520         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
 521                                      &tti->tti_buf,
 522                                      ted->ted_lr_off, th);
 523         if (rc)
 524                 GOTO(out, rc);
 525
 526         rc = dt_trans_start_local(env, tgt->lut_bottom, th);
 527         if (rc)
 528                 GOTO(out, rc);
 529         /*
 530          * Until this operations will be committed the sync is needed
 531          * for this export. This should be done _after_ starting the
 532          * transaction so that many connecting clients will not bring
 533          * server down with lots of sync writes.
 534          */
 535         rc = tgt_new_client_cb_add(th, exp);
 536         if (rc) {
 537                 /* can't add callback, do sync now */
 538                 th->th_sync = 1;
 539         } else {
 540                 spin_lock(&exp->exp_lock);
 541                 exp->exp_need_sync = 1;
 542                 spin_unlock(&exp->exp_lock);
 543         }
 544
 545         tti->tti_off = ted->ted_lr_off;
 546         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
 547         EXIT;
 548 out:
 549         dt_trans_stop(env, tgt->lut_bottom, th);
 550         CDEBUG(D_INFO, "%s: update last_rcvd client data for UUID = %s, "
 551                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 552                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 553
 554         return rc;
 555 }
 556
 557 int tgt_server_data_read(const struct lu_env *env, struct lu_target *tgt)
 558 {
 559         struct tgt_thread_info  *tti = tgt_th_info(env);
 560         int                      rc;
 561
 562         tti->tti_off = 0;
 563         tti_buf_lsd(tti);
 564         rc = dt_record_read(env, tgt->lut_last_rcvd, &tti->tti_buf,
 565                             &tti->tti_off);
 566         if (rc == 0)
 567                 lsd_le_to_cpu(&tti->tti_lsd, &tgt->lut_lsd);
 568
 569         CDEBUG(D_INFO, "%s: read last_rcvd server data for UUID = %s, "
 570                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 571                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 572         return rc;
 573 }
 574
 575 int tgt_server_data_write(const struct lu_env *env, struct lu_target *tgt,
 576                           struct thandle *th)
 577 {
 578         struct tgt_thread_info  *tti = tgt_th_info(env);
 579         struct dt_object        *dto;
 580         int                      rc;
 581
 582         ENTRY;
 583
 584         tti->tti_off = 0;
 585         tti_buf_lsd(tti);
 586         lsd_cpu_to_le(&tgt->lut_lsd, &tti->tti_lsd);
 587
 588         dto = dt_object_locate(tgt->lut_last_rcvd, th->th_dev);
 589         rc = dt_record_write(env, dto, &tti->tti_buf, &tti->tti_off, th);
 590
 591         CDEBUG(D_INFO, "%s: write last_rcvd server data for UUID = %s, "
 592                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 593                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 594
 595         RETURN(rc);
 596 }
 597
 598 /**
 599  * Update server data in last_rcvd
 600  */
 601 int tgt_server_data_update(const struct lu_env *env, struct lu_target *tgt,
 602                            int sync)
 603 {
 604         struct tgt_thread_info  *tti = tgt_th_info(env);
 605         struct thandle          *th;
 606         int                      rc = 0;
 607
 608         ENTRY;
 609
 610         CDEBUG(D_SUPER,
 611                "%s: mount_count is "LPU64", last_transno is "LPU64"\n",
 612                tgt->lut_lsd.lsd_uuid, tgt->lut_obd->u.obt.obt_mount_count,
 613                tgt->lut_last_transno);
 614
 615         /* Always save latest transno to keep it fresh */
 616         spin_lock(&tgt->lut_translock);
 617         tgt->lut_lsd.lsd_last_transno = tgt->lut_last_transno;
 618         spin_unlock(&tgt->lut_translock);
 619
 620         th = dt_trans_create(env, tgt->lut_bottom);
 621         if (IS_ERR(th))
 622                 RETURN(PTR_ERR(th));
 623
 624         th->th_sync = sync;
 625
 626         tti_buf_lsd(tti);
 627         rc = dt_declare_record_write(env, tgt->lut_last_rcvd,
 628                                      &tti->tti_buf, tti->tti_off, th);
 629         if (rc)
 630                 GOTO(out, rc);
 631
 632         rc = dt_trans_start(env, tgt->lut_bottom, th);
 633         if (rc)
 634                 GOTO(out, rc);
 635
 636         rc = tgt_server_data_write(env, tgt, th);
 637 out:
 638         dt_trans_stop(env, tgt->lut_bottom, th);
 639
 640         CDEBUG(D_INFO, "%s: update last_rcvd server data for UUID = %s, "
 641                "last_transno = "LPU64": rc = %d\n", tgt->lut_obd->obd_name,
 642                tgt->lut_lsd.lsd_uuid, tgt->lut_lsd.lsd_last_transno, rc);
 643         RETURN(rc);
 644 }
 645 EXPORT_SYMBOL(tgt_server_data_update);
 646
 647 int tgt_truncate_last_rcvd(const struct lu_env *env, struct lu_target *tgt,
 648                            loff_t size)
 649 {
 650         struct dt_object *dt = tgt->lut_last_rcvd;
 651         struct thandle   *th;
 652         struct lu_attr    attr;
 653         int               rc;
 654
 655         ENTRY;
 656
 657         attr.la_size = size;
 658         attr.la_valid = LA_SIZE;
 659
 660         th = dt_trans_create(env, tgt->lut_bottom);
 661         if (IS_ERR(th))
 662                 RETURN(PTR_ERR(th));
 663         rc = dt_declare_punch(env, dt, size, OBD_OBJECT_EOF, th);
 664         if (rc)
 665                 GOTO(cleanup, rc);
 666         rc = dt_declare_attr_set(env, dt, &attr, th);
 667         if (rc)
 668                 GOTO(cleanup, rc);
 669         rc = dt_trans_start_local(env, tgt->lut_bottom, th);
 670         if (rc)
 671                 GOTO(cleanup, rc);
 672
 673         rc = dt_punch(env, dt, size, OBD_OBJECT_EOF, th);
 674         if (rc == 0)
 675                 rc = dt_attr_set(env, dt, &attr, th);
 676
 677 cleanup:
 678         dt_trans_stop(env, tgt->lut_bottom, th);
 679
 680         RETURN(rc);
 681 }
 682
 683 static void tgt_client_epoch_update(const struct lu_env *env,
 684                                     struct obd_export *exp)
 685 {
 686         struct lsd_client_data  *lcd = exp->exp_target_data.ted_lcd;
 687         struct lu_target        *tgt = class_exp2tgt(exp);
 688
 689         LASSERT(tgt && tgt->lut_bottom);
 690         /** VBR: set client last_epoch to current epoch */
 691         if (lcd->lcd_last_epoch >= tgt->lut_lsd.lsd_start_epoch)
 692                 return;
 693         lcd->lcd_last_epoch = tgt->lut_lsd.lsd_start_epoch;
 694         tgt_client_data_update(env, exp);
 695 }
 696
 697 /**
 698  * Update boot epoch when recovery ends
 699  */
 700 void tgt_boot_epoch_update(struct lu_target *tgt)
 701 {
 702         struct lu_env            env;
 703         struct ptlrpc_request   *req;
 704         __u32                    start_epoch;
 705         struct list_head         client_list;
 706         int                      rc;
 707
 708         if (tgt->lut_obd->obd_stopping)
 709                 return;
 710
 711         rc = lu_env_init(&env, LCT_DT_THREAD);
 712         if (rc) {
 713                 CERROR("%s: can't initialize environment: rc = %d\n",
 714                         tgt->lut_obd->obd_name, rc);
 715                 return;
 716         }
 717
 718         spin_lock(&tgt->lut_translock);
 719         start_epoch = lr_epoch(tgt->lut_last_transno) + 1;
 720         tgt->lut_last_transno = (__u64)start_epoch << LR_EPOCH_BITS;
 721         tgt->lut_lsd.lsd_start_epoch = start_epoch;
 722         spin_unlock(&tgt->lut_translock);
 723
 724         INIT_LIST_HEAD(&client_list);
 725         /**
 726          * The recovery is not yet finished and final queue can still be updated
 727          * with resend requests. Move final list to separate one for processing
 728          */
 729         spin_lock(&tgt->lut_obd->obd_recovery_task_lock);
 730         list_splice_init(&tgt->lut_obd->obd_final_req_queue, &client_list);
 731         spin_unlock(&tgt->lut_obd->obd_recovery_task_lock);
 732
 733         /**
 734          * go through list of exports participated in recovery and
 735          * set new epoch for them
 736          */
 737         list_for_each_entry(req, &client_list, rq_list) {
 738                 LASSERT(!req->rq_export->exp_delayed);
 739                 if (!req->rq_export->exp_vbr_failed)
 740                         tgt_client_epoch_update(&env, req->rq_export);
 741         }
 742         /** return list back at once */
 743         spin_lock(&tgt->lut_obd->obd_recovery_task_lock);
 744         list_splice_init(&client_list, &tgt->lut_obd->obd_final_req_queue);
 745         spin_unlock(&tgt->lut_obd->obd_recovery_task_lock);
 746
 747         /** Clear MULTI RPCS incompatibility flag if
 748          * - target is MDT and
 749          * - there is no client to recover or the recovery was aborted
 750          */
 751         if (!strncmp(tgt->lut_obd->obd_type->typ_name, LUSTRE_MDT_NAME, 3) &&
 752             (tgt->lut_obd->obd_max_recoverable_clients == 0 ||
 753             tgt->lut_obd->obd_abort_recovery))
 754                 tgt->lut_lsd.lsd_feature_incompat &= ~OBD_INCOMPAT_MULTI_RPCS;
 755
 756         /** update server epoch */
 757         tgt_server_data_update(&env, tgt, 1);
 758         lu_env_fini(&env);
 759 }
 760
 761 /**
 762  * commit callback, need to update last_committed value
 763  */
 764 struct tgt_last_committed_callback {
 765         struct dt_txn_commit_cb  llcc_cb;
 766         struct lu_target        *llcc_tgt;
 767         struct obd_export       *llcc_exp;
 768         __u64                    llcc_transno;
 769 };
 770
 771 static void tgt_cb_last_committed(struct lu_env *env, struct thandle *th,
 772                                   struct dt_txn_commit_cb *cb, int err)
 773 {
 774         struct tgt_last_committed_callback *ccb;
 775
 776         ccb = container_of0(cb, struct tgt_last_committed_callback, llcc_cb);
 777
 778         LASSERT(ccb->llcc_exp);
 779         LASSERT(ccb->llcc_tgt != NULL);
 780         LASSERT(ccb->llcc_exp->exp_obd == ccb->llcc_tgt->lut_obd);
 781
 782         /* Fast path w/o spinlock, if exp_last_committed was updated
 783          * with higher transno, no need to take spinlock and check,
 784          * also no need to update obd_last_committed. */
 785         if (ccb->llcc_transno <= ccb->llcc_exp->exp_last_committed)
 786                 goto out;
 787         spin_lock(&ccb->llcc_tgt->lut_translock);
 788         if (ccb->llcc_transno > ccb->llcc_tgt->lut_obd->obd_last_committed)
 789                 ccb->llcc_tgt->lut_obd->obd_last_committed = ccb->llcc_transno;
 790
 791         if (ccb->llcc_transno > ccb->llcc_exp->exp_last_committed) {
 792                 ccb->llcc_exp->exp_last_committed = ccb->llcc_transno;
 793                 spin_unlock(&ccb->llcc_tgt->lut_translock);
 794
 795                 ptlrpc_commit_replies(ccb->llcc_exp);
 796                 tgt_cancel_slc_locks(ccb->llcc_transno);
 797         } else {
 798                 spin_unlock(&ccb->llcc_tgt->lut_translock);
 799         }
 800 out:
 801         class_export_cb_put(ccb->llcc_exp);
 802         if (ccb->llcc_transno)
 803                 CDEBUG(D_HA, "%s: transno "LPD64" is committed\n",
 804                        ccb->llcc_tgt->lut_obd->obd_name, ccb->llcc_transno);
 805         OBD_FREE_PTR(ccb);
 806 }
 807
 808 int tgt_last_commit_cb_add(struct thandle *th, struct lu_target *tgt,
 809                            struct obd_export *exp, __u64 transno)
 810 {
 811         struct tgt_last_committed_callback      *ccb;
 812         struct dt_txn_commit_cb                 *dcb;
 813         int                                      rc;
 814
 815         OBD_ALLOC_PTR(ccb);
 816         if (ccb == NULL)
 817                 return -ENOMEM;
 818
 819         ccb->llcc_tgt = tgt;
 820         ccb->llcc_exp = class_export_cb_get(exp);
 821         ccb->llcc_transno = transno;
 822
 823         dcb = &ccb->llcc_cb;
 824         dcb->dcb_func = tgt_cb_last_committed;
 825         INIT_LIST_HEAD(&dcb->dcb_linkage);
 826         strlcpy(dcb->dcb_name, "tgt_cb_last_committed", sizeof(dcb->dcb_name));
 827
 828         rc = dt_trans_cb_add(th, dcb);
 829         if (rc) {
 830                 class_export_cb_put(exp);
 831                 OBD_FREE_PTR(ccb);
 832         }
 833
 834         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 835                 /* report failure to force synchronous operation */
 836                 return -EPERM;
 837
 838         return rc;
 839 }
 840
 841 struct tgt_new_client_callback {
 842         struct dt_txn_commit_cb  lncc_cb;
 843         struct obd_export       *lncc_exp;
 844 };
 845
 846 static void tgt_cb_new_client(struct lu_env *env, struct thandle *th,
 847                               struct dt_txn_commit_cb *cb, int err)
 848 {
 849         struct tgt_new_client_callback *ccb;
 850
 851         ccb = container_of0(cb, struct tgt_new_client_callback, lncc_cb);
 852
 853         LASSERT(ccb->lncc_exp->exp_obd);
 854
 855         CDEBUG(D_RPCTRACE, "%s: committing for initial connect of %s\n",
 856                ccb->lncc_exp->exp_obd->obd_name,
 857                ccb->lncc_exp->exp_client_uuid.uuid);
 858
 859         spin_lock(&ccb->lncc_exp->exp_lock);
 860
 861         ccb->lncc_exp->exp_need_sync = 0;
 862
 863         spin_unlock(&ccb->lncc_exp->exp_lock);
 864         class_export_cb_put(ccb->lncc_exp);
 865
 866         OBD_FREE_PTR(ccb);
 867 }
 868
 869 int tgt_new_client_cb_add(struct thandle *th, struct obd_export *exp)
 870 {
 871         struct tgt_new_client_callback  *ccb;
 872         struct dt_txn_commit_cb         *dcb;
 873         int                              rc;
 874
 875         OBD_ALLOC_PTR(ccb);
 876         if (ccb == NULL)
 877                 return -ENOMEM;
 878
 879         ccb->lncc_exp = class_export_cb_get(exp);
 880
 881         dcb = &ccb->lncc_cb;
 882         dcb->dcb_func = tgt_cb_new_client;
 883         INIT_LIST_HEAD(&dcb->dcb_linkage);
 884         strlcpy(dcb->dcb_name, "tgt_cb_new_client", sizeof(dcb->dcb_name));
 885
 886         rc = dt_trans_cb_add(th, dcb);
 887         if (rc) {
 888                 class_export_cb_put(exp);
 889                 OBD_FREE_PTR(ccb);
 890         }
 891         return rc;
 892 }
 893
 894 /**
 895  * Add new client to the last_rcvd upon new connection.
 896  *
 897  * We use a bitmap to locate a free space in the last_rcvd file and initialize
 898  * tg_export_data.
 899  */
 900 int tgt_client_new(const struct lu_env *env, struct obd_export *exp)
 901 {
 902         struct tg_export_data   *ted = &exp->exp_target_data;
 903         struct lu_target        *tgt = class_exp2tgt(exp);
 904         int                      rc = 0, idx;
 905
 906         ENTRY;
 907
 908         LASSERT(tgt && tgt->lut_client_bitmap != NULL);
 909         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid))
 910                 RETURN(0);
 911
 912         if (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 913                 RETURN(0);
 914
 915         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 916          * there's no need for extra complication here
 917          */
 918         idx = find_first_zero_bit(tgt->lut_client_bitmap, LR_MAX_CLIENTS);
 919 repeat:
 920         if (idx >= LR_MAX_CLIENTS ||
 921             OBD_FAIL_CHECK(OBD_FAIL_MDS_CLIENT_ADD)) {
 922                 CERROR("%s: no room for %u clients - fix LR_MAX_CLIENTS\n",
 923                        tgt->lut_obd->obd_name,  idx);
 924                 RETURN(-EOVERFLOW);
 925         }
 926         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
 927                 idx = find_next_zero_bit(tgt->lut_client_bitmap,
 928                                              LR_MAX_CLIENTS, idx);
 929                 goto repeat;
 930         }
 931
 932         ted->ted_lr_idx = idx;
 933         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
 934                           idx * tgt->lut_lsd.lsd_client_size;
 935
 936         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 937
 938         if (tgt_is_multimodrpcs_client(exp)) {
 939                 /* Set MULTI RPCS incompatibility flag to prevent previous
 940                  * Lustre versions to mount a target with reply_data file */
 941                 atomic_inc(&tgt->lut_num_clients);
 942                 if (!(tgt->lut_lsd.lsd_feature_incompat &
 943                       OBD_INCOMPAT_MULTI_RPCS)) {
 944                         tgt->lut_lsd.lsd_feature_incompat |=
 945                                                         OBD_INCOMPAT_MULTI_RPCS;
 946                         rc = tgt_server_data_update(env, tgt, 1);
 947                         if (rc < 0) {
 948                                 CERROR("%s: unable to set MULTI RPCS "
 949                                        "incompatibility flag\n",
 950                                        exp->exp_obd->obd_name);
 951                                 RETURN(rc);
 952                         }
 953                 }
 954
 955                 /* assign client slot generation */
 956                 ted->ted_lcd->lcd_generation =
 957                                 atomic_inc_return(&tgt->lut_client_generation);
 958         } else {
 959                 ted->ted_lcd->lcd_generation = 0;
 960         }
 961
 962         CDEBUG(D_INFO, "%s: new client at index %d (%llu) with UUID '%s' "
 963                "generation %d\n",
 964                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
 965                ted->ted_lcd->lcd_uuid, ted->ted_lcd->lcd_generation);
 966
 967         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_CLIENT_ADD))
 968                 RETURN(-ENOSPC);
 969
 970         rc = tgt_client_data_update(env, exp);
 971         if (rc)
 972                 CERROR("%s: Failed to write client lcd at idx %d, rc %d\n",
 973                        tgt->lut_obd->obd_name, idx, rc);
 974
 975         RETURN(rc);
 976 }
 977 EXPORT_SYMBOL(tgt_client_new);
 978
 979 /* Add an existing client to the MDS in-memory state based on
 980  * a client that was previously found in the last_rcvd file and
 981  * already has an assigned slot (idx >= 0).
 982  *
 983  * It should not be possible to fail adding an existing client - otherwise
 984  * mdt_init_server_data() callsite needs to be fixed.
 985  */
 986 int tgt_client_add(const struct lu_env *env,  struct obd_export *exp, int idx)
 987 {
 988         struct tg_export_data   *ted = &exp->exp_target_data;
 989         struct lu_target        *tgt = class_exp2tgt(exp);
 990
 991         ENTRY;
 992
 993         LASSERT(tgt && tgt->lut_client_bitmap != NULL);
 994         LASSERTF(idx >= 0, "%d\n", idx);
 995
 996         if (!strcmp(ted->ted_lcd->lcd_uuid, tgt->lut_obd->obd_uuid.uuid) ||
 997             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
 998                 RETURN(0);
 999
1000         if (test_and_set_bit(idx, tgt->lut_client_bitmap)) {
1001                 CERROR("%s: client %d: bit already set in bitmap!!\n",
1002                        tgt->lut_obd->obd_name,  idx);
1003                 LBUG();
1004         }
1005         atomic_inc(&tgt->lut_num_clients);
1006
1007         CDEBUG(D_INFO, "%s: client at idx %d with UUID '%s' added, "
1008                "generation %d\n",
1009                tgt->lut_obd->obd_name, idx, ted->ted_lcd->lcd_uuid,
1010                ted->ted_lcd->lcd_generation);
1011
1012         ted->ted_lr_idx = idx;
1013         ted->ted_lr_off = tgt->lut_lsd.lsd_client_start +
1014                           idx * tgt->lut_lsd.lsd_client_size;
1015
1016         mutex_init(&ted->ted_lcd_lock);
1017
1018         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
1019
1020         RETURN(0);
1021 }
1022
1023 int tgt_client_del(const struct lu_env *env, struct obd_export *exp)
1024 {
1025         struct tg_export_data   *ted = &exp->exp_target_data;
1026         struct lu_target        *tgt = class_exp2tgt(exp);
1027         int                      rc;
1028
1029         ENTRY;
1030
1031         LASSERT(ted->ted_lcd);
1032
1033         if (unlikely(tgt == NULL)) {
1034                 CDEBUG(D_ERROR, "%s: No target for connected export\n",
1035                        class_exp2obd(exp)->obd_name);
1036                 RETURN(-EINVAL);
1037         }
1038
1039         /* XXX if lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
1040         if (!strcmp((char *)ted->ted_lcd->lcd_uuid,
1041                     (char *)tgt->lut_obd->obd_uuid.uuid) ||
1042             exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT)
1043                 RETURN(0);
1044
1045         CDEBUG(D_INFO, "%s: del client at idx %u, off %lld, UUID '%s'\n",
1046                tgt->lut_obd->obd_name, ted->ted_lr_idx, ted->ted_lr_off,
1047                ted->ted_lcd->lcd_uuid);
1048
1049         /* Clear the bit _after_ zeroing out the client so we don't
1050            race with filter_client_add and zero out new clients.*/
1051         if (!test_bit(ted->ted_lr_idx, tgt->lut_client_bitmap)) {
1052                 CERROR("%s: client %u: bit already clear in bitmap!!\n",
1053                        tgt->lut_obd->obd_name, ted->ted_lr_idx);
1054                 LBUG();
1055         }
1056
1057         /* Do not erase record for recoverable client. */
1058         if (exp->exp_flags & OBD_OPT_FAILOVER)
1059                 RETURN(0);
1060
1061         /* Make sure the server's last_transno is up to date.
1062          * This should be done before zeroing client slot so last_transno will
1063          * be in server data or in client data in case of failure */
1064         rc = tgt_server_data_update(env, tgt, 0);
1065         if (rc != 0) {
1066                 CERROR("%s: failed to update server data, skip client %s "
1067                        "zeroing, rc %d\n", tgt->lut_obd->obd_name,
1068                        ted->ted_lcd->lcd_uuid, rc);
1069                 RETURN(rc);
1070         }
1071
1072         mutex_lock(&ted->ted_lcd_lock);
1073         memset(ted->ted_lcd->lcd_uuid, 0, sizeof ted->ted_lcd->lcd_uuid);
1074         rc = tgt_client_data_update(env, exp);
1075         mutex_unlock(&ted->ted_lcd_lock);
1076
1077         CDEBUG(rc == 0 ? D_INFO : D_ERROR,
1078                "%s: zeroing out client %s at idx %u (%llu), rc %d\n",
1079                tgt->lut_obd->obd_name, ted->ted_lcd->lcd_uuid,
1080                ted->ted_lr_idx, ted->ted_lr_off, rc);
1081         RETURN(rc);
1082 }
1083 EXPORT_SYMBOL(tgt_client_del);
1084
1085 int tgt_add_reply_data(const struct lu_env *env, struct lu_target *tgt,
1086                        struct tg_export_data *ted, struct tg_reply_data *trd,
1087                        struct thandle *th, bool update_lrd_file)
1088 {
1089         struct lsd_reply_data   *lrd;
1090         int     i;
1091
1092         lrd = &trd->trd_reply;
1093         /* update export last transno */
1094         mutex_lock(&ted->ted_lcd_lock);
1095         if (lrd->lrd_transno > ted->ted_lcd->lcd_last_transno)
1096                 ted->ted_lcd->lcd_last_transno = lrd->lrd_transno;
1097         mutex_unlock(&ted->ted_lcd_lock);
1098
1099         /* find a empty slot */
1100         i = tgt_find_free_reply_slot(tgt);
1101         if (unlikely(i < 0)) {
1102                 CERROR("%s: couldn't find a slot for reply data: "
1103                        "rc = %d\n", tgt_name(tgt), i);
1104                 RETURN(i);
1105         }
1106         trd->trd_index = i;
1107
1108         if (update_lrd_file) {
1109                 loff_t  off;
1110                 int     rc;
1111
1112                 /* write reply data to disk */
1113                 off = sizeof(struct lsd_reply_header) + sizeof(*lrd) * i;
1114                 rc = tgt_reply_data_write(env, tgt, lrd, off, th);
1115                 if (unlikely(rc != 0)) {
1116                         CERROR("%s: can't update %s file: rc = %d\n",
1117                                tgt_name(tgt), REPLY_DATA, rc);
1118                         RETURN(rc);
1119                 }
1120         }
1121         /* add reply data to target export's reply list */
1122         mutex_lock(&ted->ted_lcd_lock);
1123         list_add(&trd->trd_list, &ted->ted_reply_list);
1124         ted->ted_reply_cnt++;
1125         if (ted->ted_reply_cnt > ted->ted_reply_max)
1126                 ted->ted_reply_max = ted->ted_reply_cnt;
1127         mutex_unlock(&ted->ted_lcd_lock);
1128
1129         CDEBUG(D_TRACE, "add reply %p: xid %llu, transno %llu, "
1130                "tag %hu, client gen %u, slot idx %d\n",
1131                trd, lrd->lrd_xid, lrd->lrd_transno,
1132                trd->trd_tag, lrd->lrd_client_gen, i);
1133         RETURN(0);
1134 }
1135 EXPORT_SYMBOL(tgt_add_reply_data);
1136
1137 /*
1138  * last_rcvd & last_committed update callbacks
1139  */
1140 static int tgt_last_rcvd_update(const struct lu_env *env, struct lu_target *tgt,
1141                                 struct dt_object *obj, __u64 opdata,
1142                                 struct thandle *th, struct ptlrpc_request *req)
1143 {
1144         struct tgt_thread_info  *tti = tgt_th_info(env);
1145         struct tgt_session_info *tsi = tgt_ses_info(env);
1146         struct obd_export       *exp = tsi->tsi_exp;
1147         struct tg_export_data   *ted;
1148         __u64                   *transno_p;
1149         int                      rc = 0;
1150         bool                     lw_client;
1151
1152         ENTRY;
1153
1154
1155         LASSERT(exp != NULL);
1156         ted = &exp->exp_target_data;
1157
1158         lw_client = exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT;
1159         if (ted->ted_lr_idx < 0 && !lw_client)
1160                 /* ofd connect may cause transaction before export has
1161                  * last_rcvd slot */
1162                 RETURN(0);
1163
1164         if (req != NULL)
1165                 tti->tti_transno = lustre_msg_get_transno(req->rq_reqmsg);
1166         else
1167                 /* From update replay, tti_transno should be set already */
1168                 LASSERT(tti->tti_transno != 0);
1169
1170         spin_lock(&tgt->lut_translock);
1171         if (th->th_result != 0) {
1172                 if (tti->tti_transno != 0) {
1173                         CERROR("%s: replay transno "LPU64" failed: rc = %d\n",
1174                                tgt_name(tgt), tti->tti_transno, th->th_result);
1175                 }
1176         } else if (tti->tti_transno == 0) {
1177                 tti->tti_transno = ++tgt->lut_last_transno;
1178         } else {
1179                 /* should be replay */
1180                 if (tti->tti_transno > tgt->lut_last_transno)
1181                         tgt->lut_last_transno = tti->tti_transno;
1182         }
1183         spin_unlock(&tgt->lut_translock);
1184
1185         /** VBR: set new versions */
1186         if (th->th_result == 0 && obj != NULL) {
1187                 struct dt_object *dto = dt_object_locate(obj, th->th_dev);
1188                 dt_version_set(env, dto, tti->tti_transno, th);
1189         }
1190
1191         /* filling reply data */
1192         CDEBUG(D_INODE, "transno = "LPU64", last_committed = "LPU64"\n",
1193                tti->tti_transno, tgt->lut_obd->obd_last_committed);
1194
1195         if (req != NULL) {
1196                 req->rq_transno = tti->tti_transno;
1197                 lustre_msg_set_transno(req->rq_repmsg, tti->tti_transno);
1198         }
1199
1200         /* if can't add callback, do sync write */
1201         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, exp, tti->tti_transno);
1202
1203         if (lw_client) {
1204                 /* All operations performed by LW clients are synchronous and
1205                  * we store the committed transno in the last_rcvd header */
1206                 spin_lock(&tgt->lut_translock);
1207                 if (tti->tti_transno > tgt->lut_lsd.lsd_last_transno) {
1208                         tgt->lut_lsd.lsd_last_transno = tti->tti_transno;
1209                         spin_unlock(&tgt->lut_translock);
1210                         /* Although lightweight (LW) connections have no slot
1211                          * in the last_rcvd, we still want to maintain
1212                          * the in-memory lsd_client_data structure in order to
1213                          * properly handle reply reconstruction. */
1214                         rc = tgt_server_data_write(env, tgt, th);
1215                 } else {
1216                         spin_unlock(&tgt->lut_translock);
1217                 }
1218         } else if (ted->ted_lr_off == 0) {
1219                 CERROR("%s: client idx %d has offset %lld\n",
1220                        tgt_name(tgt), ted->ted_lr_idx, ted->ted_lr_off);
1221                 RETURN(-EINVAL);
1222         }
1223
1224         /* Target that supports multiple reply data */
1225         if (tgt_is_multimodrpcs_client(exp)) {
1226                 struct tg_reply_data    *trd;
1227                 struct lsd_reply_data   *lrd;
1228                 __u64                   *pre_versions;
1229                 bool                    write_update;
1230
1231                 OBD_ALLOC_PTR(trd);
1232                 if (unlikely(trd == NULL))
1233                         RETURN(-ENOMEM);
1234
1235                 /* fill reply data information */
1236                 lrd = &trd->trd_reply;
1237                 lrd->lrd_transno = tti->tti_transno;
1238                 if (req != NULL) {
1239                         lrd->lrd_xid = req->rq_xid;
1240                         trd->trd_tag = lustre_msg_get_tag(req->rq_reqmsg);
1241                         pre_versions = lustre_msg_get_versions(req->rq_repmsg);
1242                         lrd->lrd_result = th->th_result;
1243                         lrd->lrd_client_gen = ted->ted_lcd->lcd_generation;
1244                         write_update = true;
1245                 } else {
1246                         LASSERT(tsi->tsi_xid != 0);
1247                         lrd->lrd_xid = tsi->tsi_xid;
1248                         lrd->lrd_result = tsi->tsi_result;
1249                         lrd->lrd_client_gen = tsi->tsi_client_gen;
1250                         trd->trd_tag = 0;
1251                         pre_versions = NULL;
1252                         write_update = false;
1253                 }
1254
1255                 lrd->lrd_data = opdata;
1256                 if (pre_versions) {
1257                         trd->trd_pre_versions[0] = pre_versions[0];
1258                         trd->trd_pre_versions[1] = pre_versions[1];
1259                         trd->trd_pre_versions[2] = pre_versions[2];
1260                         trd->trd_pre_versions[3] = pre_versions[3];
1261                 }
1262
1263                 rc = tgt_add_reply_data(env, tgt, ted, trd, th, write_update);
1264                 if (rc < 0)
1265                         OBD_FREE_PTR(trd);
1266                 return rc;
1267         }
1268
1269         /* Enough for update replay, let's return */
1270         if (req == NULL)
1271                 RETURN(rc);
1272
1273         mutex_lock(&ted->ted_lcd_lock);
1274         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
1275         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE) {
1276                 transno_p = &ted->ted_lcd->lcd_last_close_transno;
1277                 ted->ted_lcd->lcd_last_close_xid = req->rq_xid;
1278                 ted->ted_lcd->lcd_last_close_result = th->th_result;
1279         } else {
1280                 /* VBR: save versions in last_rcvd for reconstruct. */
1281                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
1282
1283                 if (pre_versions) {
1284                         ted->ted_lcd->lcd_pre_versions[0] = pre_versions[0];
1285                         ted->ted_lcd->lcd_pre_versions[1] = pre_versions[1];
1286                         ted->ted_lcd->lcd_pre_versions[2] = pre_versions[2];
1287                         ted->ted_lcd->lcd_pre_versions[3] = pre_versions[3];
1288                 }
1289                 transno_p = &ted->ted_lcd->lcd_last_transno;
1290                 ted->ted_lcd->lcd_last_xid = req->rq_xid;
1291                 ted->ted_lcd->lcd_last_result = th->th_result;
1292                 /* XXX: lcd_last_data is __u32 but intent_dispostion is __u64,
1293                  * see struct ldlm_reply->lock_policy_res1; */
1294                 ted->ted_lcd->lcd_last_data = opdata;
1295         }
1296
1297         /* Update transno in slot only if non-zero number, i.e. no errors */
1298         if (likely(tti->tti_transno != 0)) {
1299                 /* Don't overwrite bigger transaction number with lower one.
1300                  * That is not sign of problem in all cases, but in any case
1301                  * this value should be monotonically increased only. */
1302                 if (*transno_p > tti->tti_transno) {
1303                         if (!tgt->lut_no_reconstruct) {
1304                                 CERROR("%s: trying to overwrite bigger transno:"
1305                                        "on-disk: "LPU64", new: "LPU64" replay: "
1306                                        "%d. See LU-617.\n", tgt_name(tgt),
1307                                        *transno_p, tti->tti_transno,
1308                                        req_is_replay(req));
1309                                 if (req_is_replay(req)) {
1310                                         spin_lock(&req->rq_export->exp_lock);
1311                                         req->rq_export->exp_vbr_failed = 1;
1312                                         spin_unlock(&req->rq_export->exp_lock);
1313                                 }
1314                                 mutex_unlock(&ted->ted_lcd_lock);
1315                                 RETURN(req_is_replay(req) ? -EOVERFLOW : 0);
1316                         }
1317                 } else {
1318                         *transno_p = tti->tti_transno;
1319                 }
1320         }
1321
1322         if (!lw_client) {
1323                 tti->tti_off = ted->ted_lr_off;
1324                 rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
1325                 if (rc < 0) {
1326                         mutex_unlock(&ted->ted_lcd_lock);
1327                         RETURN(rc);
1328                 }
1329         }
1330         mutex_unlock(&ted->ted_lcd_lock);
1331         RETURN(rc);
1332 }
1333
1334 /*
1335  * last_rcvd update for echo client simulation.
1336  * It updates last_rcvd client slot and version of object in
1337  * simple way but with all locks to simulate all drawbacks
1338  */
1339 static int tgt_last_rcvd_update_echo(const struct lu_env *env,
1340                                      struct lu_target *tgt,
1341                                      struct dt_object *obj,
1342                                      struct thandle *th,
1343                                      struct obd_export *exp)
1344 {
1345         struct tgt_thread_info  *tti = tgt_th_info(env);
1346         struct tg_export_data   *ted = &exp->exp_target_data;
1347         int                      rc = 0;
1348
1349         ENTRY;
1350
1351         tti->tti_transno = 0;
1352
1353         spin_lock(&tgt->lut_translock);
1354         if (th->th_result == 0)
1355                 tti->tti_transno = ++tgt->lut_last_transno;
1356         spin_unlock(&tgt->lut_translock);
1357
1358         /** VBR: set new versions */
1359         if (th->th_result == 0 && obj != NULL)
1360                 dt_version_set(env, obj, tti->tti_transno, th);
1361
1362         /* if can't add callback, do sync write */
1363         th->th_sync |= !!tgt_last_commit_cb_add(th, tgt, exp,
1364                                                 tti->tti_transno);
1365
1366         LASSERT(ted->ted_lr_off > 0);
1367
1368         mutex_lock(&ted->ted_lcd_lock);
1369         LASSERT(ergo(tti->tti_transno == 0, th->th_result != 0));
1370         ted->ted_lcd->lcd_last_transno = tti->tti_transno;
1371         ted->ted_lcd->lcd_last_result = th->th_result;
1372
1373         tti->tti_off = ted->ted_lr_off;
1374         rc = tgt_client_data_write(env, tgt, ted->ted_lcd, &tti->tti_off, th);
1375         mutex_unlock(&ted->ted_lcd_lock);
1376         RETURN(rc);
1377 }
1378
1379 static int tgt_clients_data_init(const struct lu_env *env,
1380                                  struct lu_target *tgt,
1381                                  unsigned long last_size)
1382 {
1383         struct obd_device       *obd = tgt->lut_obd;
1384         struct lr_server_data   *lsd = &tgt->lut_lsd;
1385         struct lsd_client_data  *lcd = NULL;
1386         struct tg_export_data   *ted;
1387         int                      cl_idx;
1388         int                      rc = 0;
1389         loff_t                   off = lsd->lsd_client_start;
1390         __u32                    generation = 0;
1391         struct cfs_hash         *hash = NULL;
1392
1393         ENTRY;
1394
1395         CLASSERT(offsetof(struct lsd_client_data, lcd_padding) +
1396                  sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
1397
1398         OBD_ALLOC_PTR(lcd);
1399         if (lcd == NULL)
1400                 RETURN(-ENOMEM);
1401
1402         hash = cfs_hash_getref(tgt->lut_obd->obd_gen_hash);
1403         if (hash == NULL)
1404                 GOTO(err_out, rc = -ENODEV);
1405
1406         for (cl_idx = 0; off < last_size; cl_idx++) {
1407                 struct obd_export       *exp;
1408                 __u64                    last_transno;
1409
1410                 /* Don't assume off is incremented properly by
1411                  * read_record(), in case sizeof(*lcd)
1412                  * isn't the same as fsd->lsd_client_size.  */
1413                 off = lsd->lsd_client_start + cl_idx * lsd->lsd_client_size;
1414                 rc = tgt_client_data_read(env, tgt, lcd, &off, cl_idx);
1415                 if (rc) {
1416                         CERROR("%s: error reading last_rcvd %s idx %d off "
1417                                "%llu: rc = %d\n", tgt_name(tgt), LAST_RCVD,
1418                                cl_idx, off, rc);
1419                         rc = 0;
1420                         break; /* read error shouldn't cause startup to fail */
1421                 }
1422
1423                 if (lcd->lcd_uuid[0] == '\0') {
1424                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
1425                                cl_idx);
1426                         continue;
1427                 }
1428
1429                 last_transno = lcd_last_transno(lcd);
1430
1431                 /* These exports are cleaned up by disconnect, so they
1432                  * need to be set up like real exports as connect does.
1433                  */
1434                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
1435                        " srv lr: "LPU64" lx: "LPU64" gen %u\n", lcd->lcd_uuid,
1436                        cl_idx, last_transno, lsd->lsd_last_transno,
1437                        lcd_last_xid(lcd), lcd->lcd_generation);
1438
1439                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
1440                 if (IS_ERR(exp)) {
1441                         if (PTR_ERR(exp) == -EALREADY) {
1442                                 /* export already exists, zero out this one */
1443                                 CERROR("%s: Duplicate export %s!\n",
1444                                        tgt_name(tgt), lcd->lcd_uuid);
1445                                 continue;
1446                         }
1447                         GOTO(err_out, rc = PTR_ERR(exp));
1448                 }
1449
1450                 ted = &exp->exp_target_data;
1451                 *ted->ted_lcd = *lcd;
1452
1453                 rc = tgt_client_add(env, exp, cl_idx);
1454                 LASSERTF(rc == 0, "rc = %d\n", rc); /* can't fail existing */
1455                 /* VBR: set export last committed version */
1456                 exp->exp_last_committed = last_transno;
1457                 spin_lock(&exp->exp_lock);
1458                 exp->exp_connecting = 0;
1459                 exp->exp_in_recovery = 0;
1460                 spin_unlock(&exp->exp_lock);
1461                 obd->obd_max_recoverable_clients++;
1462
1463                 if (tgt->lut_lsd.lsd_feature_incompat &
1464                     OBD_INCOMPAT_MULTI_RPCS &&
1465                     lcd->lcd_generation != 0) {
1466                         /* compute the highest valid client generation */
1467                         generation = max(generation, lcd->lcd_generation);
1468                         /* fill client_generation <-> export hash table */
1469                         rc = cfs_hash_add_unique(hash, &lcd->lcd_generation,
1470                                                  &exp->exp_gen_hash);
1471                         if (rc != 0) {
1472                                 CERROR("%s: duplicate export for client "
1473                                        "generation %u\n",
1474                                        tgt_name(tgt), lcd->lcd_generation);
1475                                 class_export_put(exp);
1476                                 GOTO(err_out, rc);
1477                         }
1478                 }
1479
1480                 class_export_put(exp);
1481
1482                 rc = rev_import_init(exp);
1483                 if (rc != 0) {
1484                         class_unlink_export(exp);
1485                         GOTO(err_out, rc);
1486                 }
1487
1488                 /* Need to check last_rcvd even for duplicated exports. */
1489                 CDEBUG(D_OTHER, "client at idx %d has last_transno = "LPU64"\n",
1490                        cl_idx, last_transno);
1491
1492                 spin_lock(&tgt->lut_translock);
1493                 tgt->lut_last_transno = max(last_transno,
1494                                             tgt->lut_last_transno);
1495                 spin_unlock(&tgt->lut_translock);
1496         }
1497
1498         /* record highest valid client generation */
1499         atomic_set(&tgt->lut_client_generation, generation);
1500
1501 err_out:
1502         if (hash != NULL)
1503                 cfs_hash_putref(hash);
1504         OBD_FREE_PTR(lcd);
1505         RETURN(rc);
1506 }
1507
1508 struct server_compat_data {
1509         __u32 rocompat;
1510         __u32 incompat;
1511         __u32 rocinit;
1512         __u32 incinit;
1513 };
1514
1515 static struct server_compat_data tgt_scd[] = {
1516         [LDD_F_SV_TYPE_MDT] = {
1517                 .rocompat = OBD_ROCOMPAT_LOVOBJID,
1518                 .incompat = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
1519                             OBD_INCOMPAT_FID | OBD_INCOMPAT_IAM_DIR |
1520                             OBD_INCOMPAT_LMM_VER | OBD_INCOMPAT_MULTI_OI |
1521                             OBD_INCOMPAT_MULTI_RPCS,
1522                 .rocinit = OBD_ROCOMPAT_LOVOBJID,
1523                 .incinit = OBD_INCOMPAT_MDT | OBD_INCOMPAT_COMMON_LR |
1524                            OBD_INCOMPAT_MULTI_OI,
1525         },
1526         [LDD_F_SV_TYPE_OST] = {
1527                 .rocompat = OBD_ROCOMPAT_IDX_IN_IDIF,
1528                 .incompat = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR |
1529                             OBD_INCOMPAT_FID,
1530                 .rocinit = OBD_ROCOMPAT_IDX_IN_IDIF,
1531                 .incinit = OBD_INCOMPAT_OST | OBD_INCOMPAT_COMMON_LR,
1532         }
1533 };
1534
1535 int tgt_server_data_init(const struct lu_env *env, struct lu_target *tgt)
1536 {
1537         struct tgt_thread_info          *tti = tgt_th_info(env);
1538         struct lr_server_data           *lsd = &tgt->lut_lsd;
1539         unsigned long                    last_rcvd_size;
1540         __u32                            index;
1541         int                              rc, type;
1542
1543         rc = dt_attr_get(env, tgt->lut_last_rcvd, &tti->tti_attr);
1544         if (rc)
1545                 RETURN(rc);
1546
1547         last_rcvd_size = (unsigned long)tti->tti_attr.la_size;
1548
1549         /* ensure padding in the struct is the correct size */
1550         CLASSERT(offsetof(struct lr_server_data, lsd_padding) +
1551                  sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
1552
1553         rc = server_name2index(tgt_name(tgt), &index, NULL);
1554         if (rc < 0) {
1555                 CERROR("%s: Can not get index from name: rc = %d\n",
1556                        tgt_name(tgt), rc);
1557                 RETURN(rc);
1558         }
1559         /* server_name2index() returns type */
1560         type = rc;
1561         if (type != LDD_F_SV_TYPE_MDT && type != LDD_F_SV_TYPE_OST) {
1562                 CERROR("%s: unknown target type %x\n", tgt_name(tgt), type);
1563                 RETURN(-EINVAL);
1564         }
1565
1566         /* last_rcvd on OST doesn't provide reconstruct support because there
1567          * may be up to 8 in-flight write requests per single slot in
1568          * last_rcvd client data
1569          */
1570         tgt->lut_no_reconstruct = (type == LDD_F_SV_TYPE_OST);
1571
1572         if (last_rcvd_size == 0) {
1573                 LCONSOLE_WARN("%s: new disk, initializing\n", tgt_name(tgt));
1574
1575                 memcpy(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid,
1576                        sizeof(lsd->lsd_uuid));
1577                 lsd->lsd_last_transno = 0;
1578                 lsd->lsd_mount_count = 0;
1579                 lsd->lsd_server_size = LR_SERVER_SIZE;
1580                 lsd->lsd_client_start = LR_CLIENT_START;
1581                 lsd->lsd_client_size = LR_CLIENT_SIZE;
1582                 lsd->lsd_subdir_count = OBJ_SUBDIR_COUNT;
1583                 lsd->lsd_osd_index = index;
1584                 lsd->lsd_feature_rocompat = tgt_scd[type].rocinit;
1585                 lsd->lsd_feature_incompat = tgt_scd[type].incinit;
1586         } else {
1587                 rc = tgt_server_data_read(env, tgt);
1588                 if (rc) {
1589                         CERROR("%s: error reading LAST_RCVD: rc= %d\n",
1590                                tgt_name(tgt), rc);
1591                         RETURN(rc);
1592                 }
1593                 if (strcmp(lsd->lsd_uuid, tgt->lut_obd->obd_uuid.uuid)) {
1594                         LCONSOLE_ERROR_MSG(0x157, "Trying to start OBD %s "
1595                                            "using the wrong disk %s. Were the"
1596                                            " /dev/ assignments rearranged?\n",
1597                                            tgt->lut_obd->obd_uuid.uuid,
1598                                            lsd->lsd_uuid);
1599                         RETURN(-EINVAL);
1600                 }
1601
1602                 if (lsd->lsd_osd_index != index) {
1603                         LCONSOLE_ERROR_MSG(0x157, "%s: index %d in last rcvd "
1604                                            "is different with the index %d in"
1605                                            "config log, It might be disk"
1606                                            "corruption!\n", tgt_name(tgt),
1607                                            lsd->lsd_osd_index, index);
1608                         RETURN(-EINVAL);
1609                 }
1610         }
1611
1612         if (lsd->lsd_feature_incompat & ~tgt_scd[type].incompat) {
1613                 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
1614                        tgt_name(tgt),
1615                        lsd->lsd_feature_incompat & ~tgt_scd[type].incompat);
1616                 RETURN(-EINVAL);
1617         }
1618
1619         if (type == LDD_F_SV_TYPE_MDT)
1620                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
1621
1622         if (lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat) {
1623                 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
1624                        tgt_name(tgt),
1625                        lsd->lsd_feature_rocompat & ~tgt_scd[type].rocompat);
1626                 RETURN(-EINVAL);
1627         }
1628         /** Interop: evict all clients at first boot with 1.8 last_rcvd */
1629         if (type == LDD_F_SV_TYPE_MDT &&
1630             !(lsd->lsd_feature_compat & OBD_COMPAT_20)) {
1631                 if (last_rcvd_size > lsd->lsd_client_start) {
1632                         LCONSOLE_WARN("%s: mounting at first time on 1.8 FS, "
1633                                       "remove all clients for interop needs\n",
1634                                       tgt_name(tgt));
1635                         rc = tgt_truncate_last_rcvd(env, tgt,
1636                                                     lsd->lsd_client_start);
1637                         if (rc)
1638                                 RETURN(rc);
1639                         last_rcvd_size = lsd->lsd_client_start;
1640                 }
1641                 /** set 2.0 flag to upgrade/downgrade between 1.8 and 2.0 */
1642                 lsd->lsd_feature_compat |= OBD_COMPAT_20;
1643         }
1644
1645         spin_lock(&tgt->lut_translock);
1646         tgt->lut_last_transno = lsd->lsd_last_transno;
1647         spin_unlock(&tgt->lut_translock);
1648
1649         lsd->lsd_mount_count++;
1650
1651         CDEBUG(D_INODE, "=======,=BEGIN DUMPING LAST_RCVD========\n");
1652         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
1653                tgt_name(tgt), tgt->lut_last_transno);
1654         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
1655                tgt_name(tgt), lsd->lsd_mount_count);
1656         CDEBUG(D_INODE, "%s: server data size: %u\n",
1657                tgt_name(tgt), lsd->lsd_server_size);
1658         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
1659                tgt_name(tgt), lsd->lsd_client_start);
1660         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
1661                tgt_name(tgt), lsd->lsd_client_size);
1662         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
1663                tgt_name(tgt), last_rcvd_size);
1664         CDEBUG(D_INODE, "%s: server subdir_count: %u\n",
1665                tgt_name(tgt), lsd->lsd_subdir_count);
1666         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", tgt_name(tgt),
1667                last_rcvd_size <= lsd->lsd_client_start ? 0 :
1668                (last_rcvd_size - lsd->lsd_client_start) /
1669                 lsd->lsd_client_size);
1670         CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
1671
1672         if (lsd->lsd_server_size == 0 || lsd->lsd_client_start == 0 ||
1673             lsd->lsd_client_size == 0) {
1674                 CERROR("%s: bad last_rcvd contents!\n", tgt_name(tgt));
1675                 RETURN(-EINVAL);
1676         }
1677
1678         if (!tgt->lut_obd->obd_replayable)
1679                 CWARN("%s: recovery support OFF\n", tgt_name(tgt));
1680
1681         rc = tgt_clients_data_init(env, tgt, last_rcvd_size);
1682         if (rc < 0)
1683                 GOTO(err_client, rc);
1684
1685         spin_lock(&tgt->lut_translock);
1686         /* obd_last_committed is used for compatibility
1687          * with other lustre recovery code */
1688         tgt->lut_obd->obd_last_committed = tgt->lut_last_transno;
1689         spin_unlock(&tgt->lut_translock);
1690
1691         tgt->lut_obd->u.obt.obt_mount_count = lsd->lsd_mount_count;
1692         tgt->lut_obd->u.obt.obt_instance = (__u32)lsd->lsd_mount_count;
1693
1694         /* save it, so mount count and last_transno is current */
1695         rc = tgt_server_data_update(env, tgt, 0);
1696         if (rc < 0)
1697                 GOTO(err_client, rc);
1698
1699         RETURN(0);
1700
1701 err_client:
1702         class_disconnect_exports(tgt->lut_obd);
1703         return rc;
1704 }
1705
1706 /* add credits for last_rcvd update */
1707 int tgt_txn_start_cb(const struct lu_env *env, struct thandle *th,
1708                      void *cookie)
1709 {
1710         struct lu_target        *tgt = cookie;
1711         struct tgt_session_info *tsi;
1712         struct tgt_thread_info  *tti = tgt_th_info(env);
1713         struct dt_object        *dto;
1714         int                      rc;
1715
1716         /* if there is no session, then this transaction is not result of
1717          * request processing but some local operation */
1718         if (env->le_ses == NULL)
1719                 return 0;
1720
1721         LASSERT(tgt->lut_last_rcvd);
1722         tsi = tgt_ses_info(env);
1723         /* OFD may start transaction without export assigned */
1724         if (tsi->tsi_exp == NULL)
1725                 return 0;
1726
1727         if (tgt_is_multimodrpcs_client(tsi->tsi_exp)) {
1728                 /*
1729                  * Use maximum possible file offset for declaration to ensure
1730                  * ZFS will reserve enough credits for a write anywhere in this
1731                  * file, since we don't know where in the file the write will be
1732                  * because a replay slot has not been assigned.  This should be
1733                  * replaced by dmu_tx_hold_append() when available.
1734                  */
1735                 tti->tti_off = atomic_read(&tgt->lut_num_clients) * 8 *
1736                                 sizeof(struct lsd_reply_data);
1737                 tti->tti_buf.lb_buf = NULL;
1738                 tti->tti_buf.lb_len = sizeof(struct lsd_reply_data);
1739                 dto = dt_object_locate(tgt->lut_reply_data, th->th_dev);
1740                 rc = dt_declare_record_write(env, dto, &tti->tti_buf,
1741                                              tti->tti_off, th);
1742                 if (rc)
1743                         return rc;
1744         } else {
1745                 dto = dt_object_locate(tgt->lut_last_rcvd, th->th_dev);
1746                 tti_buf_lcd(tti);
1747                 tti->tti_off = tsi->tsi_exp->exp_target_data.ted_lr_off;
1748                 rc = dt_declare_record_write(env, dto, &tti->tti_buf,
1749                                              tti->tti_off, th);
1750                 if (rc)
1751                         return rc;
1752         }
1753
1754         if (tsi->tsi_vbr_obj != NULL &&
1755             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu)) {
1756                 dto = dt_object_locate(tsi->tsi_vbr_obj, th->th_dev);
1757                 rc = dt_declare_version_set(env, dto, th);
1758         }
1759
1760         return rc;
1761 }
1762
1763 /* Update last_rcvd records with latests transaction data */
1764 int tgt_txn_stop_cb(const struct lu_env *env, struct thandle *th,
1765                     void *cookie)
1766 {
1767         struct lu_target        *tgt = cookie;
1768         struct tgt_session_info *tsi;
1769         struct tgt_thread_info  *tti = tgt_th_info(env);
1770         struct dt_object        *obj = NULL;
1771         int                      rc;
1772         bool                     echo_client;
1773
1774         if (env->le_ses == NULL)
1775                 return 0;
1776
1777         tsi = tgt_ses_info(env);
1778         /* OFD may start transaction without export assigned */
1779         if (tsi->tsi_exp == NULL)
1780                 return 0;
1781
1782         echo_client = (tgt_ses_req(tsi) == NULL && tsi->tsi_xid == 0);
1783
1784         if (tti->tti_has_trans && !echo_client) {
1785                 if (tti->tti_mult_trans == 0) {
1786                         CDEBUG(D_HA, "More than one transaction "LPU64"\n",
1787                                tti->tti_transno);
1788                         RETURN(0);
1789                 }
1790                 /* we need another transno to be assigned */
1791                 tti->tti_transno = 0;
1792         } else if (th->th_result == 0) {
1793                 tti->tti_has_trans = 1;
1794         }
1795
1796         if (tsi->tsi_vbr_obj != NULL &&
1797             !lu_object_remote(&tsi->tsi_vbr_obj->do_lu)) {
1798                 obj = tsi->tsi_vbr_obj;
1799         }
1800
1801         if (unlikely(echo_client)) /* echo client special case */
1802                 rc = tgt_last_rcvd_update_echo(env, tgt, obj, th,
1803                                                tsi->tsi_exp);
1804         else
1805                 rc = tgt_last_rcvd_update(env, tgt, obj, tsi->tsi_opdata, th,
1806                                           tgt_ses_req(tsi));
1807         return rc;
1808 }
1809
1810 int tgt_reply_data_init(const struct lu_env *env, struct lu_target *tgt)
1811 {
1812         struct tgt_thread_info  *tti = tgt_th_info(env);
1813         struct lsd_reply_data   *lrd = &tti->tti_lrd;
1814         unsigned long            reply_data_size;
1815         int                      rc;
1816         struct lsd_reply_header *lrh = NULL;
1817         struct lsd_client_data  *lcd = NULL;
1818         struct tg_reply_data    *trd = NULL;
1819         int                      idx;
1820         loff_t                   off;
1821         struct cfs_hash         *hash = NULL;
1822         struct obd_export       *exp;
1823         struct tg_export_data   *ted;
1824         int                      reply_data_recovered = 0;
1825
1826         rc = dt_attr_get(env, tgt->lut_reply_data, &tti->tti_attr);
1827         if (rc)
1828                 GOTO(out, rc);
1829         reply_data_size = (unsigned long)tti->tti_attr.la_size;
1830
1831         OBD_ALLOC_PTR(lrh);
1832         if (lrh == NULL)
1833                 GOTO(out, rc = -ENOMEM);
1834
1835         if (reply_data_size == 0) {
1836                 CDEBUG(D_INFO, "%s: new reply_data file, initializing\n",
1837                        tgt_name(tgt));
1838                 lrh->lrh_magic = LRH_MAGIC;
1839                 lrh->lrh_header_size = sizeof(struct lsd_reply_header);
1840                 lrh->lrh_reply_size = sizeof(struct lsd_reply_data);
1841                 rc = tgt_reply_header_write(env, tgt, lrh);
1842                 if (rc) {
1843                         CERROR("%s: error writing %s: rc = %d\n",
1844                                tgt_name(tgt), REPLY_DATA, rc);
1845                         GOTO(out, rc);
1846                 }
1847         } else {
1848                 rc = tgt_reply_header_read(env, tgt, lrh);
1849                 if (rc) {
1850                         CERROR("%s: error reading %s: rc = %d\n",
1851                                tgt_name(tgt), REPLY_DATA, rc);
1852                         GOTO(out, rc);
1853                 }
1854                 if (lrh->lrh_magic != LRH_MAGIC ||
1855                     lrh->lrh_header_size != sizeof(struct lsd_reply_header) ||
1856                     lrh->lrh_reply_size != sizeof(struct lsd_reply_data)) {
1857                         CERROR("%s: invalid header in %s\n",
1858                                tgt_name(tgt), REPLY_DATA);
1859                         GOTO(out, rc = -EINVAL);
1860                 }
1861
1862                 hash = cfs_hash_getref(tgt->lut_obd->obd_gen_hash);
1863                 if (hash == NULL)
1864                         GOTO(out, rc = -ENODEV);
1865
1866                 OBD_ALLOC_PTR(lcd);
1867                 if (lcd == NULL)
1868                         GOTO(out, rc = -ENOMEM);
1869
1870                 OBD_ALLOC_PTR(trd);
1871                 if (trd == NULL)
1872                         GOTO(out, rc = -ENOMEM);
1873
1874                 /* Load reply_data from disk */
1875                 for (idx = 0, off = sizeof(struct lsd_reply_header);
1876                      off < reply_data_size;
1877                      idx++, off += sizeof(struct lsd_reply_data)) {
1878                         rc = tgt_reply_data_read(env, tgt, lrd, off);
1879                         if (rc) {
1880                                 CERROR("%s: error reading %s: rc = %d\n",
1881                                        tgt_name(tgt), REPLY_DATA, rc);
1882                                 GOTO(out, rc);
1883                         }
1884
1885                         exp = cfs_hash_lookup(hash, &lrd->lrd_client_gen);
1886                         if (exp == NULL) {
1887                                 /* old reply data from a disconnected client */
1888                                 continue;
1889                         }
1890                         ted = &exp->exp_target_data;
1891                         mutex_lock(&ted->ted_lcd_lock);
1892
1893                         /* create in-memory reply_data and link it to
1894                          * target export's reply list */
1895                         rc = tgt_set_reply_slot(tgt, idx);
1896                         if (rc != 0) {
1897                                 mutex_unlock(&ted->ted_lcd_lock);
1898                                 GOTO(out, rc);
1899                         }
1900                         trd->trd_reply = *lrd;
1901                         trd->trd_pre_versions[0] = 0;
1902                         trd->trd_pre_versions[1] = 0;
1903                         trd->trd_pre_versions[2] = 0;
1904                         trd->trd_pre_versions[3] = 0;
1905                         trd->trd_index = idx;
1906                         trd->trd_tag = 0;
1907                         list_add(&trd->trd_list, &ted->ted_reply_list);
1908                         ted->ted_reply_cnt++;
1909                         if (ted->ted_reply_cnt > ted->ted_reply_max)
1910                                 ted->ted_reply_max = ted->ted_reply_cnt;
1911
1912                         CDEBUG(D_HA, "%s: restore reply %p: xid %llu, "
1913                                "transno %llu, client gen %u, slot idx %d\n",
1914                                tgt_name(tgt), trd, lrd->lrd_xid,
1915                                lrd->lrd_transno, lrd->lrd_client_gen,
1916                                trd->trd_index);
1917
1918                         /* update export last committed transation */
1919                         exp->exp_last_committed = max(exp->exp_last_committed,
1920                                                       lrd->lrd_transno);
1921
1922                         mutex_unlock(&ted->ted_lcd_lock);
1923                         class_export_put(exp);
1924
1925                         /* update target last committed transaction */
1926                         spin_lock(&tgt->lut_translock);
1927                         tgt->lut_last_transno = max(tgt->lut_last_transno,
1928                                                     lrd->lrd_transno);
1929                         spin_unlock(&tgt->lut_translock);
1930
1931                         reply_data_recovered++;
1932
1933                         OBD_ALLOC_PTR(trd);
1934                         if (trd == NULL)
1935                                 GOTO(out, rc = -ENOMEM);
1936                 }
1937                 CDEBUG(D_INFO, "%s: %d reply data have been recovered\n",
1938                        tgt_name(tgt), reply_data_recovered);
1939         }
1940
1941         spin_lock(&tgt->lut_translock);
1942         /* obd_last_committed is used for compatibility
1943          * with other lustre recovery code */
1944         tgt->lut_obd->obd_last_committed = tgt->lut_last_transno;
1945         spin_unlock(&tgt->lut_translock);
1946
1947         rc = 0;
1948
1949 out:
1950         if (hash != NULL)
1951                 cfs_hash_putref(hash);
1952         if (lcd != NULL)
1953                 OBD_FREE_PTR(lcd);
1954         if (trd != NULL)
1955                 OBD_FREE_PTR(trd);
1956         if (lrh != NULL)
1957                 OBD_FREE_PTR(lrh);
1958         return rc;
1959 }
1960
1961 struct tg_reply_data *tgt_lookup_reply_by_xid(struct tg_export_data *ted,
1962                                               __u64 xid)
1963 {
1964         struct tg_reply_data    *found = NULL;
1965         struct tg_reply_data    *reply;
1966
1967         mutex_lock(&ted->ted_lcd_lock);
1968         list_for_each_entry(reply, &ted->ted_reply_list, trd_list) {
1969                 if (reply->trd_reply.lrd_xid == xid) {
1970                         found = reply;
1971                         break;
1972                 }
1973         }
1974         mutex_unlock(&ted->ted_lcd_lock);
1975         return found;
1976 }
1977 EXPORT_SYMBOL(tgt_lookup_reply_by_xid);
1978
1979 /* Look for a reply data matching specified request @req
1980  * A copy is returned in @trd if the pointer is not NULL
1981  */
1982 bool tgt_lookup_reply(struct ptlrpc_request *req, struct tg_reply_data *trd)
1983 {
1984         struct tg_export_data   *ted = &req->rq_export->exp_target_data;
1985         struct tg_reply_data    *reply;
1986         bool                     found = false;
1987
1988         reply = tgt_lookup_reply_by_xid(ted, req->rq_xid);
1989         if (reply != NULL) {
1990                 found = true;
1991                 if (trd != NULL)
1992                         *trd = *reply;
1993         }
1994
1995         CDEBUG(D_TRACE, "%s: lookup reply xid %llu, found %d\n",
1996                tgt_name(class_exp2tgt(req->rq_export)), req->rq_xid,
1997                found ? 1 : 0);
1998
1999         return found;
2000 }
2001 EXPORT_SYMBOL(tgt_lookup_reply);
2002
2003 int tgt_handle_received_xid(struct obd_export *exp, __u64 rcvd_xid)
2004 {
2005         struct tg_export_data   *ted = &exp->exp_target_data;
2006         struct lu_target        *lut = class_exp2tgt(exp);
2007         struct tg_reply_data    *trd, *tmp;
2008
2009         mutex_lock(&ted->ted_lcd_lock);
2010         list_for_each_entry_safe(trd, tmp, &ted->ted_reply_list, trd_list) {
2011                 if (trd->trd_reply.lrd_xid > rcvd_xid)
2012                         continue;
2013                 ted->ted_release_xid++;
2014                 tgt_release_reply_data(lut, ted, trd);
2015         }
2016         mutex_unlock(&ted->ted_lcd_lock);
2017
2018         return 0;
2019 }
2020
2021 int tgt_handle_tag(struct obd_export *exp, __u16 tag)
2022 {
2023         struct tg_export_data   *ted = &exp->exp_target_data;
2024         struct lu_target        *lut = class_exp2tgt(exp);
2025         struct tg_reply_data    *trd, *tmp;
2026
2027         if (tag == 0)
2028                 return 0;
2029
2030         mutex_lock(&ted->ted_lcd_lock);
2031         list_for_each_entry_safe(trd, tmp, &ted->ted_reply_list, trd_list) {
2032                 if (trd->trd_tag != tag)
2033                         continue;
2034                 ted->ted_release_tag++;
2035                 tgt_release_reply_data(lut, ted, trd);
2036                 break;
2037         }
2038         mutex_unlock(&ted->ted_lcd_lock);
2039
2040         return 0;
2041 }
2042