lustre/mdt/mdt_recovery.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  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/mdt/mdt_recovery.c
  37  *
  38  * Lustre Metadata Target (mdt) recovery-related methods
  39  *
  40  * Author: Huang Hua <huanghua@clusterfs.com>
  41  * Author: Pershin Mike <tappro@clusterfs.com>
  42  */
  43
  44 #ifndef EXPORT_SYMTAB
  45 # define EXPORT_SYMTAB
  46 #endif
  47 #define DEBUG_SUBSYSTEM S_MDS
  48
  49 #include "mdt_internal.h"
  50
  51 static int mdt_server_data_update(const struct lu_env *env,
  52                                   struct mdt_device *mdt);
  53
  54 struct lu_buf *mdt_buf(const struct lu_env *env, void *area, ssize_t len)
  55 {
  56         struct lu_buf *buf;
  57         struct mdt_thread_info *mti;
  58
  59         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
  60         buf = &mti->mti_buf;
  61         buf->lb_buf = area;
  62         buf->lb_len = len;
  63         return buf;
  64 }
  65
  66 const struct lu_buf *mdt_buf_const(const struct lu_env *env,
  67                                    const void *area, ssize_t len)
  68 {
  69         struct lu_buf *buf;
  70         struct mdt_thread_info *mti;
  71
  72         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
  73         buf = &mti->mti_buf;
  74
  75         buf->lb_buf = (void *)area;
  76         buf->lb_len = len;
  77         return buf;
  78 }
  79
  80 int mdt_record_read(const struct lu_env *env,
  81                     struct dt_object *dt, struct lu_buf *buf, loff_t *pos)
  82 {
  83         int rc;
  84
  85         LASSERTF(dt != NULL, "dt is NULL when we want to read record\n");
  86
  87         rc = dt->do_body_ops->dbo_read(env, dt, buf, pos, BYPASS_CAPA);
  88
  89         if (rc == buf->lb_len)
  90                 rc = 0;
  91         else if (rc >= 0)
  92                 rc = -EFAULT;
  93         return rc;
  94 }
  95
  96 int mdt_record_write(const struct lu_env *env,
  97                      struct dt_object *dt, const struct lu_buf *buf,
  98                      loff_t *pos, struct thandle *th)
  99 {
 100         int rc;
 101
 102         LASSERTF(dt != NULL, "dt is NULL when we want to write record\n");
 103         LASSERT(th != NULL);
 104         rc = dt->do_body_ops->dbo_write(env, dt, buf, pos, th, BYPASS_CAPA, 1);
 105         if (rc == buf->lb_len)
 106                 rc = 0;
 107         else if (rc >= 0)
 108                 rc = -EFAULT;
 109         return rc;
 110 }
 111
 112 static inline int mdt_trans_credit_get(const struct lu_env *env,
 113                                        struct mdt_device *mdt,
 114                                        enum mdt_txn_op op)
 115 {
 116         struct dt_device *dev = mdt->mdt_bottom;
 117         int cr;
 118         switch (op) {
 119                 case MDT_TXN_CAPA_KEYS_WRITE_OP:
 120                 case MDT_TXN_LAST_RCVD_WRITE_OP:
 121                         cr = dev->dd_ops->dt_credit_get(env,
 122                                                         dev,
 123                                                         DTO_WRITE_BLOCK);
 124                 break;
 125                 default:
 126                         LBUG();
 127         }
 128         return cr;
 129 }
 130
 131 void mdt_trans_credit_init(const struct lu_env *env,
 132                            struct mdt_device *mdt,
 133                            enum mdt_txn_op op)
 134 {
 135         struct mdt_thread_info *mti;
 136         struct txn_param *p;
 137         int cr;
 138
 139         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 140         p = &mti->mti_txn_param;
 141
 142         cr = mdt_trans_credit_get(env, mdt, op);
 143         txn_param_init(p, cr);
 144 }
 145
 146 struct thandle* mdt_trans_start(const struct lu_env *env,
 147                                 struct mdt_device *mdt)
 148 {
 149         struct mdt_thread_info *mti;
 150         struct txn_param *p;
 151
 152         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 153         p = &mti->mti_txn_param;
 154
 155         /* export can require sync operations */
 156         if (mti->mti_exp != NULL)
 157                 p->tp_sync = mti->mti_exp->exp_need_sync;
 158
 159         return mdt->mdt_bottom->dd_ops->dt_trans_start(env, mdt->mdt_bottom, p);
 160 }
 161
 162 void mdt_trans_stop(const struct lu_env *env,
 163                     struct mdt_device *mdt, struct thandle *th)
 164 {
 165         mdt->mdt_bottom->dd_ops->dt_trans_stop(env, th);
 166 }
 167
 168 /* last_rcvd handling */
 169 static inline void lsd_le_to_cpu(struct lr_server_data *buf,
 170                                  struct lr_server_data *lsd)
 171 {
 172         memcpy(lsd->lsd_uuid, buf->lsd_uuid, sizeof (lsd->lsd_uuid));
 173         lsd->lsd_last_transno     = le64_to_cpu(buf->lsd_last_transno);
 174         lsd->lsd_mount_count      = le64_to_cpu(buf->lsd_mount_count);
 175         lsd->lsd_feature_compat   = le32_to_cpu(buf->lsd_feature_compat);
 176         lsd->lsd_feature_rocompat = le32_to_cpu(buf->lsd_feature_rocompat);
 177         lsd->lsd_feature_incompat = le32_to_cpu(buf->lsd_feature_incompat);
 178         lsd->lsd_server_size      = le32_to_cpu(buf->lsd_server_size);
 179         lsd->lsd_client_start     = le32_to_cpu(buf->lsd_client_start);
 180         lsd->lsd_client_size      = le16_to_cpu(buf->lsd_client_size);
 181 }
 182
 183 static inline void lsd_cpu_to_le(struct lr_server_data *lsd,
 184                                  struct lr_server_data *buf)
 185 {
 186         memcpy(buf->lsd_uuid, lsd->lsd_uuid, sizeof (lsd->lsd_uuid));
 187         buf->lsd_last_transno     = cpu_to_le64(lsd->lsd_last_transno);
 188         buf->lsd_mount_count      = cpu_to_le64(lsd->lsd_mount_count);
 189         buf->lsd_feature_compat   = cpu_to_le32(lsd->lsd_feature_compat);
 190         buf->lsd_feature_rocompat = cpu_to_le32(lsd->lsd_feature_rocompat);
 191         buf->lsd_feature_incompat = cpu_to_le32(lsd->lsd_feature_incompat);
 192         buf->lsd_server_size      = cpu_to_le32(lsd->lsd_server_size);
 193         buf->lsd_client_start     = cpu_to_le32(lsd->lsd_client_start);
 194         buf->lsd_client_size      = cpu_to_le16(lsd->lsd_client_size);
 195 }
 196
 197 static inline void lcd_le_to_cpu(struct lsd_client_data *buf,
 198                                  struct lsd_client_data *lcd)
 199 {
 200         memcpy(lcd->lcd_uuid, buf->lcd_uuid, sizeof (lcd->lcd_uuid));
 201         lcd->lcd_last_transno       = le64_to_cpu(buf->lcd_last_transno);
 202         lcd->lcd_last_xid           = le64_to_cpu(buf->lcd_last_xid);
 203         lcd->lcd_last_result        = le32_to_cpu(buf->lcd_last_result);
 204         lcd->lcd_last_data          = le32_to_cpu(buf->lcd_last_data);
 205         lcd->lcd_last_close_transno = le64_to_cpu(buf->lcd_last_close_transno);
 206         lcd->lcd_last_close_xid     = le64_to_cpu(buf->lcd_last_close_xid);
 207         lcd->lcd_last_close_result  = le32_to_cpu(buf->lcd_last_close_result);
 208 }
 209
 210 static inline void lcd_cpu_to_le(struct lsd_client_data *lcd,
 211                                  struct lsd_client_data *buf)
 212 {
 213         memcpy(buf->lcd_uuid, lcd->lcd_uuid, sizeof (lcd->lcd_uuid));
 214         buf->lcd_last_transno       = cpu_to_le64(lcd->lcd_last_transno);
 215         buf->lcd_last_xid           = cpu_to_le64(lcd->lcd_last_xid);
 216         buf->lcd_last_result        = cpu_to_le32(lcd->lcd_last_result);
 217         buf->lcd_last_data          = cpu_to_le32(lcd->lcd_last_data);
 218         buf->lcd_last_close_transno = cpu_to_le64(lcd->lcd_last_close_transno);
 219         buf->lcd_last_close_xid     = cpu_to_le64(lcd->lcd_last_close_xid);
 220         buf->lcd_last_close_result  = cpu_to_le32(lcd->lcd_last_close_result);
 221 }
 222
 223 static inline int mdt_last_rcvd_header_read(const struct lu_env *env,
 224                                             struct mdt_device *mdt)
 225 {
 226         struct mdt_thread_info *mti;
 227         int rc;
 228
 229         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 230
 231         mti->mti_off = 0;
 232         rc = mdt_record_read(env, mdt->mdt_last_rcvd,
 233                              mdt_buf(env, &mti->mti_lsd, sizeof(mti->mti_lsd)),
 234                              &mti->mti_off);
 235         if (rc == 0)
 236                 lsd_le_to_cpu(&mti->mti_lsd, &mdt->mdt_lsd);
 237
 238         CDEBUG(D_INFO, "read last_rcvd header rc = %d:\n"
 239                        "uuid = %s\n"
 240                        "last_transno = "LPU64"\n",
 241                         rc, mdt->mdt_lsd.lsd_uuid,
 242                         mdt->mdt_lsd.lsd_last_transno);
 243         return rc;
 244 }
 245
 246 static inline int mdt_last_rcvd_header_write(const struct lu_env *env,
 247                                              struct mdt_device *mdt)
 248 {
 249         struct mdt_thread_info *mti;
 250         struct thandle *th;
 251         int rc;
 252         ENTRY;
 253
 254         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 255
 256         mdt_trans_credit_init(env, mdt, MDT_TXN_LAST_RCVD_WRITE_OP);
 257         th = mdt_trans_start(env, mdt);
 258         if (IS_ERR(th))
 259                 RETURN(PTR_ERR(th));
 260
 261         mti->mti_off = 0;
 262         lsd_cpu_to_le(&mdt->mdt_lsd, &mti->mti_lsd);
 263
 264         rc = mdt_record_write(env, mdt->mdt_last_rcvd,
 265                               mdt_buf_const(env, &mti->mti_lsd,
 266                                             sizeof(mti->mti_lsd)),
 267                               &mti->mti_off, th);
 268
 269         mdt_trans_stop(env, mdt, th);
 270
 271         CDEBUG(D_INFO, "write last_rcvd header rc = %d:\n"
 272                "uuid = %s\nlast_transno = "LPU64"\n",
 273                rc, mdt->mdt_lsd.lsd_uuid, mdt->mdt_lsd.lsd_last_transno);
 274
 275         RETURN(rc);
 276 }
 277
 278 static int mdt_last_rcvd_read(const struct lu_env *env,
 279                               struct mdt_device *mdt,
 280                               struct lsd_client_data *lcd, loff_t *off)
 281 {
 282         struct mdt_thread_info *mti;
 283         struct lsd_client_data *tmp;
 284         int rc;
 285
 286         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 287         tmp = &mti->mti_lcd;
 288         rc = mdt_record_read(env, mdt->mdt_last_rcvd,
 289                              mdt_buf(env, tmp, sizeof(*tmp)), off);
 290         if (rc == 0)
 291                 lcd_le_to_cpu(tmp, lcd);
 292
 293         CDEBUG(D_INFO, "read lcd @%d rc = %d:\n"
 294                        "uuid = %s\n"
 295                        "last_transno = "LPU64"\n"
 296                        "last_xid = "LPU64"\n"
 297                        "last_result = %u\n"
 298                        "last_data = %u\n"
 299                        "last_close_transno = "LPU64"\n"
 300                        "last_close_xid = "LPU64"\n"
 301                        "last_close_result = %u\n",
 302                         (int)(*off - sizeof(*tmp)),
 303                         rc,
 304                         lcd->lcd_uuid,
 305                         lcd->lcd_last_transno,
 306                         lcd->lcd_last_xid,
 307                         lcd->lcd_last_result,
 308                         lcd->lcd_last_data,
 309                         lcd->lcd_last_close_transno,
 310                         lcd->lcd_last_close_xid,
 311                         lcd->lcd_last_close_result);
 312         return rc;
 313 }
 314
 315 static int mdt_last_rcvd_write(const struct lu_env *env,
 316                                struct mdt_device *mdt,
 317                                struct lsd_client_data *lcd,
 318                                loff_t *off, struct thandle *th)
 319 {
 320         struct mdt_thread_info *mti;
 321         struct lsd_client_data *tmp;
 322         int rc;
 323
 324         LASSERT(th != NULL);
 325         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 326         tmp = &mti->mti_lcd;
 327
 328         lcd_cpu_to_le(lcd, tmp);
 329
 330         rc = mdt_record_write(env, mdt->mdt_last_rcvd,
 331                               mdt_buf_const(env, tmp, sizeof(*tmp)), off, th);
 332
 333         CDEBUG(D_INFO, "write lcd @%d rc = %d:\n"
 334                        "uuid = %s\n"
 335                        "last_transno = "LPU64"\n"
 336                        "last_xid = "LPU64"\n"
 337                        "last_result = %u\n"
 338                        "last_data = %u\n"
 339                        "last_close_transno = "LPU64"\n"
 340                        "last_close_xid = "LPU64"\n"
 341                        "last_close_result = %u\n",
 342                         (int)(*off - sizeof(*tmp)),
 343                         rc,
 344                         lcd->lcd_uuid,
 345                         lcd->lcd_last_transno,
 346                         lcd->lcd_last_xid,
 347                         lcd->lcd_last_result,
 348                         lcd->lcd_last_data,
 349                         lcd->lcd_last_close_transno,
 350                         lcd->lcd_last_close_xid,
 351                         lcd->lcd_last_close_result);
 352         return rc;
 353 }
 354
 355 static int mdt_clients_data_init(const struct lu_env *env,
 356                                  struct mdt_device *mdt,
 357                                  unsigned long last_size)
 358 {
 359         struct lr_server_data  *lsd = &mdt->mdt_lsd;
 360         struct lsd_client_data *lcd = NULL;
 361         struct obd_device      *obd = mdt2obd_dev(mdt);
 362         loff_t off;
 363         int cl_idx;
 364         int rc = 0;
 365         ENTRY;
 366
 367         /* When we do a clean MDS shutdown, we save the last_transno into
 368          * the header.  If we find clients with higher last_transno values
 369          * then those clients may need recovery done. */
 370         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
 371         for (cl_idx = 0, off = lsd->lsd_client_start;
 372              off < last_size; cl_idx++) {
 373                 __u64 last_transno;
 374                 struct obd_export *exp;
 375
 376                 if (!lcd) {
 377                         OBD_ALLOC_PTR(lcd);
 378                         if (!lcd)
 379                                 RETURN(-ENOMEM);
 380                 }
 381
 382                 off = lsd->lsd_client_start +
 383                         cl_idx * lsd->lsd_client_size;
 384
 385                 rc = mdt_last_rcvd_read(env, mdt, lcd, &off);
 386                 if (rc) {
 387                         CERROR("error reading MDS %s idx %d, off %llu: rc %d\n",
 388                                LAST_RCVD, cl_idx, off, rc);
 389                         rc = 0;
 390                         break; /* read error shouldn't cause startup to fail */
 391                 }
 392
 393                 if (lcd->lcd_uuid[0] == '\0') {
 394                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
 395                                cl_idx);
 396                         continue;
 397                 }
 398
 399                 last_transno = lcd_last_transno(lcd);
 400
 401                 /* These exports are cleaned up by mdt_obd_disconnect(), so
 402                  * they need to be set up like real exports as
 403                  * mdt_obd_connect() does.
 404                  */
 405                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
 406                        " srv lr: "LPU64" lx: "LPU64"\n", lcd->lcd_uuid, cl_idx,
 407                        last_transno, lsd->lsd_last_transno,
 408                        lcd_last_xid(lcd));
 409
 410                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
 411                 if (IS_ERR(exp)) {
 412                         if (PTR_ERR(exp) == -EALREADY) {
 413                                 /* export already exists, zero out this one */
 414                                 lcd->lcd_uuid[0] = '\0';
 415                         } else
 416                                 GOTO(err_client, rc = PTR_ERR(exp));
 417                 } else {
 418                         struct mdt_thread_info *mti;
 419                         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 420                         LASSERT(mti != NULL);
 421                         mti->mti_exp = exp;
 422                         exp->exp_mdt_data.med_lcd = lcd;
 423                         rc = mdt_client_add(env, mdt, cl_idx);
 424                         /* can't fail existing */
 425                         LASSERTF(rc == 0, "rc = %d\n", rc);
 426                         lcd = NULL;
 427                         spin_lock(&exp->exp_lock);
 428                         exp->exp_connecting = 0;
 429                         exp->exp_in_recovery = 0;
 430                         spin_unlock(&exp->exp_lock);
 431                         obd->obd_max_recoverable_clients++;
 432                         class_export_put(exp);
 433                 }
 434
 435                 CDEBUG(D_OTHER, "client at idx %d has last_transno="LPU64"\n",
 436                        cl_idx, last_transno);
 437                 /* protect __u64 value update */
 438                 spin_lock(&mdt->mdt_transno_lock);
 439                 mdt->mdt_last_transno = max(last_transno,
 440                                             mdt->mdt_last_transno);
 441                 spin_unlock(&mdt->mdt_transno_lock);
 442         }
 443
 444 err_client:
 445         if (lcd)
 446                 OBD_FREE_PTR(lcd);
 447         RETURN(rc);
 448 }
 449
 450 static int mdt_server_data_init(const struct lu_env *env,
 451                                 struct mdt_device *mdt,
 452                                 struct lustre_sb_info *lsi)
 453 {
 454         struct lr_server_data  *lsd = &mdt->mdt_lsd;
 455         struct lsd_client_data *lcd = NULL;
 456         struct obd_device      *obd = mdt2obd_dev(mdt);
 457         struct mdt_thread_info *mti;
 458         struct dt_object       *obj;
 459         struct lu_attr         *la;
 460         struct lustre_disk_data  *ldd;
 461         unsigned long last_rcvd_size;
 462         __u64 mount_count;
 463         int rc;
 464         ENTRY;
 465
 466         /* ensure padding in the struct is the correct size */
 467         CLASSERT(offsetof(struct lr_server_data, lsd_padding) +
 468                 sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
 469         CLASSERT(offsetof(struct lsd_client_data, lcd_padding) +
 470                 sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
 471
 472         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 473         LASSERT(mti != NULL);
 474         la = &mti->mti_attr.ma_attr;
 475
 476         obj = mdt->mdt_last_rcvd;
 477         rc = obj->do_ops->do_attr_get(env, mdt->mdt_last_rcvd, la, BYPASS_CAPA);
 478         if (rc)
 479                 RETURN(rc);
 480
 481         last_rcvd_size = (unsigned long)la->la_size;
 482
 483         if (last_rcvd_size == 0) {
 484                 LCONSOLE_WARN("%s: new disk, initializing\n", obd->obd_name);
 485
 486                 memcpy(lsd->lsd_uuid, obd->obd_uuid.uuid,
 487                        sizeof(lsd->lsd_uuid));
 488                 lsd->lsd_last_transno = 0;
 489                 lsd->lsd_mount_count = 0;
 490                 lsd->lsd_server_size = LR_SERVER_SIZE;
 491                 lsd->lsd_client_start = LR_CLIENT_START;
 492                 lsd->lsd_client_size = LR_CLIENT_SIZE;
 493                 lsd->lsd_feature_rocompat = OBD_ROCOMPAT_LOVOBJID;
 494                 lsd->lsd_feature_incompat = OBD_INCOMPAT_MDT |
 495                                                        OBD_INCOMPAT_COMMON_LR;
 496         } else {
 497                 LCONSOLE_WARN("%s: used disk, loading\n", obd->obd_name);
 498                 rc = mdt_last_rcvd_header_read(env, mdt);
 499                 if (rc) {
 500                         CERROR("error reading MDS %s: rc %d\n", LAST_RCVD, rc);
 501                         GOTO(out, rc);
 502                 }
 503                 if (strcmp(lsd->lsd_uuid, obd->obd_uuid.uuid) != 0) {
 504                         LCONSOLE_ERROR_MSG(0x157, "Trying to start OBD %s using"
 505                                            "the wrong disk %s. Were the /dev/ "
 506                                            "assignments rearranged?\n",
 507                                            obd->obd_uuid.uuid, lsd->lsd_uuid);
 508                         GOTO(out, rc = -EINVAL);
 509                 }
 510         }
 511         mount_count = lsd->lsd_mount_count;
 512
 513         ldd = lsi->lsi_ldd;
 514
 515         if (ldd->ldd_flags & LDD_F_IAM_DIR)
 516                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_IAM_DIR;
 517
 518         lsd->lsd_feature_compat = OBD_COMPAT_MDT;
 519         lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
 520
 521         spin_lock(&mdt->mdt_transno_lock);
 522         mdt->mdt_last_transno = lsd->lsd_last_transno;
 523         spin_unlock(&mdt->mdt_transno_lock);
 524
 525         CDEBUG(D_INODE, "========BEGIN DUMPING LAST_RCVD========\n");
 526         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
 527                obd->obd_name, mdt->mdt_last_transno);
 528         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
 529                obd->obd_name, mount_count + 1);
 530         CDEBUG(D_INODE, "%s: server data size: %u\n",
 531                obd->obd_name, lsd->lsd_server_size);
 532         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
 533                obd->obd_name, lsd->lsd_client_start);
 534         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
 535                obd->obd_name, lsd->lsd_client_size);
 536         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
 537                obd->obd_name, last_rcvd_size);
 538         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", obd->obd_name,
 539                last_rcvd_size <= lsd->lsd_client_start ? 0 :
 540                (last_rcvd_size - lsd->lsd_client_start) /
 541                 lsd->lsd_client_size);
 542         CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
 543
 544         if (!lsd->lsd_server_size || !lsd->lsd_client_start ||
 545             !lsd->lsd_client_size) {
 546                 CERROR("Bad last_rcvd contents!\n");
 547                 GOTO(out, rc = -EINVAL);
 548         }
 549
 550         rc = mdt_clients_data_init(env, mdt, last_rcvd_size);
 551         if (rc)
 552                 GOTO(err_client, rc);
 553
 554         spin_lock(&mdt->mdt_transno_lock);
 555         /* obd_last_committed is used for compatibility
 556          * with other lustre recovery code */
 557         obd->obd_last_committed = mdt->mdt_last_transno;
 558         spin_unlock(&mdt->mdt_transno_lock);
 559
 560         mdt->mdt_mount_count++;
 561         lsd->lsd_mount_count = mdt->mdt_mount_count;
 562
 563         /* save it, so mount count and last_transno is current */
 564         rc = mdt_server_data_update(env, mdt);
 565         if (rc)
 566                 GOTO(err_client, rc);
 567
 568         RETURN(0);
 569
 570 err_client:
 571         target_recovery_fini(obd);
 572 out:
 573         return rc;
 574 }
 575
 576 static int mdt_server_data_update(const struct lu_env *env,
 577                                   struct mdt_device *mdt)
 578 {
 579         int rc = 0;
 580         ENTRY;
 581
 582         CDEBUG(D_SUPER, "MDS mount_count is "LPU64", last_transno is "LPU64"\n",
 583                mdt->mdt_mount_count, mdt->mdt_last_transno);
 584
 585         spin_lock(&mdt->mdt_transno_lock);
 586         mdt->mdt_lsd.lsd_last_transno = mdt->mdt_last_transno;
 587         spin_unlock(&mdt->mdt_transno_lock);
 588
 589         /*
 590          * This may be called from difficult reply handler and
 591          * mdt->mdt_last_rcvd may be NULL that time.
 592          */
 593         if (mdt->mdt_last_rcvd != NULL)
 594                 rc = mdt_last_rcvd_header_write(env, mdt);
 595         RETURN(rc);
 596 }
 597
 598 void mdt_cb_new_client(const struct mdt_device *mdt, __u64 transno,
 599                                   void *data, int err)
 600 {
 601         struct obd_device *obd = mdt2obd_dev(mdt);
 602
 603         target_client_add_cb(obd, transno, data, err);
 604 }
 605
 606 int mdt_client_new(const struct lu_env *env, struct mdt_device *mdt)
 607 {
 608         unsigned long *bitmap = mdt->mdt_client_bitmap;
 609         struct mdt_thread_info *mti;
 610         struct mdt_export_data *med;
 611         struct lsd_client_data *lcd;
 612         struct lr_server_data  *lsd = &mdt->mdt_lsd;
 613         struct obd_device *obd = mdt2obd_dev(mdt);
 614         struct thandle *th;
 615         loff_t off;
 616         int rc;
 617         int cl_idx;
 618         ENTRY;
 619
 620         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 621         LASSERT(mti != NULL);
 622
 623         med = &mti->mti_exp->exp_mdt_data;
 624         lcd = med->med_lcd;
 625
 626         LASSERT(bitmap != NULL);
 627         if (!strcmp(med->med_lcd->lcd_uuid, obd->obd_uuid.uuid))
 628                 RETURN(0);
 629
 630         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 631          * there's no need for extra complication here
 632          */
 633         spin_lock(&mdt->mdt_client_bitmap_lock);
 634         cl_idx = find_first_zero_bit(bitmap, LR_MAX_CLIENTS);
 635         if (cl_idx >= LR_MAX_CLIENTS ||
 636             OBD_FAIL_CHECK(OBD_FAIL_MDS_CLIENT_ADD)) {
 637                 CERROR("no room for %u clients - fix LR_MAX_CLIENTS\n",
 638                        cl_idx);
 639                 spin_unlock(&mdt->mdt_client_bitmap_lock);
 640                 RETURN(-EOVERFLOW);
 641         }
 642         set_bit(cl_idx, bitmap);
 643         spin_unlock(&mdt->mdt_client_bitmap_lock);
 644
 645         CDEBUG(D_INFO, "client at idx %d with UUID '%s' added\n",
 646                cl_idx, med->med_lcd->lcd_uuid);
 647
 648         med->med_lr_idx = cl_idx;
 649         med->med_lr_off = lsd->lsd_client_start +
 650                           (cl_idx * lsd->lsd_client_size);
 651         init_mutex(&med->med_lcd_lock);
 652
 653         LASSERTF(med->med_lr_off > 0, "med_lr_off = %llu\n", med->med_lr_off);
 654         /* write new client data */
 655         off = med->med_lr_off;
 656         mdt_trans_credit_init(env, mdt, MDT_TXN_LAST_RCVD_WRITE_OP);
 657         th = mdt_trans_start(env, mdt);
 658         if (IS_ERR(th))
 659                 RETURN(PTR_ERR(th));
 660
 661         /* until this operations will be committed the sync is needed for this
 662          * export */
 663         mdt_trans_add_cb(th, mdt_cb_new_client, mti->mti_exp);
 664         spin_lock(&mti->mti_exp->exp_lock);
 665         mti->mti_exp->exp_need_sync = 1;
 666         spin_unlock(&mti->mti_exp->exp_lock);
 667
 668         rc = mdt_last_rcvd_write(env, mdt, lcd, &off, th);
 669         CDEBUG(D_INFO, "wrote client lcd at idx %u off %llu (len "LPSZ")\n",
 670                cl_idx, med->med_lr_off, sizeof(*lcd));
 671         mdt_trans_stop(env, mdt, th);
 672
 673         RETURN(rc);
 674 }
 675
 676 /* Add client data to the MDS.  We use a bitmap to locate a free space
 677  * in the last_rcvd file if cl_off is -1 (i.e. a new client).
 678  * Otherwise, we just have to read the data from the last_rcvd file and
 679  * we know its offset.
 680  *
 681  * It should not be possible to fail adding an existing client - otherwise
 682  * mdt_init_server_data() callsite needs to be fixed.
 683  */
 684 int mdt_client_add(const struct lu_env *env,
 685                    struct mdt_device *mdt, int cl_idx)
 686 {
 687         struct mdt_thread_info *mti;
 688         struct mdt_export_data *med;
 689         unsigned long *bitmap = mdt->mdt_client_bitmap;
 690         struct obd_device *obd = mdt2obd_dev(mdt);
 691         struct lr_server_data *lsd = &mdt->mdt_lsd;
 692         int rc = 0;
 693         ENTRY;
 694
 695         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 696         LASSERT(mti != NULL);
 697
 698         med = &mti->mti_exp->exp_mdt_data;
 699
 700         LASSERT(bitmap != NULL);
 701         LASSERTF(cl_idx >= 0, "%d\n", cl_idx);
 702
 703         if (!strcmp(med->med_lcd->lcd_uuid, obd->obd_uuid.uuid))
 704                 RETURN(0);
 705
 706         spin_lock(&mdt->mdt_client_bitmap_lock);
 707         if (test_and_set_bit(cl_idx, bitmap)) {
 708                 CERROR("MDS client %d: bit already set in bitmap!!\n",
 709                        cl_idx);
 710                 LBUG();
 711         }
 712         spin_unlock(&mdt->mdt_client_bitmap_lock);
 713
 714         CDEBUG(D_INFO, "client at idx %d with UUID '%s' added\n",
 715                cl_idx, med->med_lcd->lcd_uuid);
 716
 717         med->med_lr_idx = cl_idx;
 718         med->med_lr_off = lsd->lsd_client_start +
 719                           (cl_idx * lsd->lsd_client_size);
 720         init_mutex(&med->med_lcd_lock);
 721
 722         LASSERTF(med->med_lr_off > 0, "med_lr_off = %llu\n", med->med_lr_off);
 723
 724         RETURN(rc);
 725 }
 726
 727 int mdt_client_del(const struct lu_env *env, struct mdt_device *mdt)
 728 {
 729         struct mdt_thread_info *mti;
 730         struct mdt_export_data *med;
 731         struct lsd_client_data *lcd;
 732         struct obd_device      *obd = mdt2obd_dev(mdt);
 733         struct thandle *th;
 734         loff_t off;
 735         int rc = 0;
 736         ENTRY;
 737
 738         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 739         LASSERT(mti != NULL);
 740
 741         med = &mti->mti_exp->exp_mdt_data;
 742         lcd = med->med_lcd;
 743         if (!lcd)
 744                 RETURN(0);
 745
 746         /* XXX: If lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 747         if (!strcmp(med->med_lcd->lcd_uuid, obd->obd_uuid.uuid))
 748                 GOTO(free, 0);
 749
 750         CDEBUG(D_INFO, "freeing client at idx %u, offset %lld\n",
 751                med->med_lr_idx, med->med_lr_off);
 752
 753         off = med->med_lr_off;
 754
 755         /*
 756          * Don't clear med_lr_idx here as it is likely also unset.  At worst we
 757          * leak a client slot that will be cleaned on the next recovery.
 758          */
 759         if (off <= 0) {
 760                 CERROR("client idx %d has offset %lld\n",
 761                         med->med_lr_idx, off);
 762                 GOTO(free, rc = -EINVAL);
 763         }
 764
 765         /*
 766          * Clear the bit _after_ zeroing out the client so we don't race with
 767          * mdt_client_add and zero out new clients.
 768          */
 769         if (!test_bit(med->med_lr_idx, mdt->mdt_client_bitmap)) {
 770                 CERROR("MDT client %u: bit already clear in bitmap!!\n",
 771                        med->med_lr_idx);
 772                 LBUG();
 773         }
 774
 775         /*
 776          * This may be called from difficult reply handler path and
 777          * mdt->mdt_last_rcvd may be NULL that time.
 778          */
 779         if (mdt->mdt_last_rcvd != NULL) {
 780                 mdt_trans_credit_init(env, mdt, MDT_TXN_LAST_RCVD_WRITE_OP);
 781                 th = mdt_trans_start(env, mdt);
 782                 if (IS_ERR(th))
 783                         GOTO(free, rc = PTR_ERR(th));
 784
 785                 mutex_down(&med->med_lcd_lock);
 786                 memset(lcd, 0, sizeof *lcd);
 787
 788                 rc = mdt_last_rcvd_write(env, mdt, lcd, &off, th);
 789                 mutex_up(&med->med_lcd_lock);
 790                 mdt_trans_stop(env, mdt, th);
 791         }
 792
 793         CDEBUG(rc == 0 ? D_INFO : D_ERROR, "Zeroing out client idx %u in "
 794                "%s rc %d\n",  med->med_lr_idx, LAST_RCVD, rc);
 795
 796         spin_lock(&mdt->mdt_client_bitmap_lock);
 797         clear_bit(med->med_lr_idx, mdt->mdt_client_bitmap);
 798         spin_unlock(&mdt->mdt_client_bitmap_lock);
 799
 800         /*
 801          * Make sure the server's last_transno is up to date. Do this after the
 802          * client is freed so we know all the client's transactions have been
 803          * committed.
 804          */
 805         mdt_server_data_update(env, mdt);
 806         EXIT;
 807 free:
 808         OBD_FREE_PTR(lcd);
 809         med->med_lcd = NULL;
 810         return 0;
 811 }
 812
 813 /*
 814  * last_rcvd & last_committed update callbacks
 815  */
 816 static int mdt_last_rcvd_update(struct mdt_thread_info *mti,
 817                                 struct thandle *th)
 818 {
 819         struct mdt_device *mdt = mti->mti_mdt;
 820         struct ptlrpc_request *req = mdt_info_req(mti);
 821         struct mdt_export_data *med;
 822         struct lsd_client_data *lcd;
 823         loff_t off;
 824         int err;
 825         __s32 rc = th->th_result;
 826         __u64 *transno_p;
 827
 828         ENTRY;
 829         LASSERT(req);
 830         LASSERT(req->rq_export);
 831         LASSERT(mdt);
 832         med = &req->rq_export->exp_mdt_data;
 833         LASSERT(med);
 834         lcd = med->med_lcd;
 835         /* if the export has already been failed, we have no last_rcvd slot */
 836         if (req->rq_export->exp_failed) {
 837                 CWARN("commit transaction for disconnected client %s: rc %d\n",
 838                       req->rq_export->exp_client_uuid.uuid, rc);
 839                 if (rc == 0)
 840                         rc = -ENOTCONN;
 841                 RETURN(rc);
 842         }
 843
 844         off = med->med_lr_off;
 845         mutex_down(&med->med_lcd_lock);
 846         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
 847             lustre_msg_get_opc(req->rq_reqmsg) == MDS_DONE_WRITING) {
 848                 transno_p = &lcd->lcd_last_close_transno;
 849                 lcd->lcd_last_close_xid = req->rq_xid;
 850                 lcd->lcd_last_close_result = rc;
 851         } else {
 852                 transno_p = &lcd->lcd_last_transno;
 853                 lcd->lcd_last_xid = req->rq_xid;
 854                 lcd->lcd_last_result = rc;
 855                 /*XXX: save intent_disposition in mdt_thread_info?
 856                  * also there is bug - intent_dispostion is __u64,
 857                  * see struct ldlm_reply->lock_policy_res1; */
 858                 lcd->lcd_last_data = mti->mti_opdata;
 859         }
 860
 861         /*
 862          * When we store zero transno in lcd we can lost last transno value
 863          * because lcd contains 0, but lsd is not yet written
 864          * The server data should be updated also if the latest
 865          * transno is rewritten by zero. See the bug 11125 for details.
 866          */
 867         if (mti->mti_transno == 0 &&
 868             *transno_p == mdt->mdt_last_transno)
 869                 mdt_server_data_update(mti->mti_env, mdt);
 870
 871         *transno_p = mti->mti_transno;
 872
 873         if (off <= 0) {
 874                 CERROR("client idx %d has offset %lld\n", med->med_lr_idx, off);
 875                 err = -EINVAL;
 876         } else {
 877                 err = mdt_last_rcvd_write(mti->mti_env, mdt, lcd, &off, th);
 878         }
 879         mutex_up(&med->med_lcd_lock);
 880         RETURN(err);
 881 }
 882
 883 extern struct lu_context_key mdt_thread_key;
 884
 885 /* add credits for last_rcvd update */
 886 static int mdt_txn_start_cb(const struct lu_env *env,
 887                             struct txn_param *param, void *cookie)
 888 {
 889         struct mdt_device *mdt = cookie;
 890
 891         param->tp_credits += mdt_trans_credit_get(env, mdt,
 892                                                   MDT_TXN_LAST_RCVD_WRITE_OP);
 893         return 0;
 894 }
 895
 896 /* Update last_rcvd records with latests transaction data */
 897 static int mdt_txn_stop_cb(const struct lu_env *env,
 898                            struct thandle *txn, void *cookie)
 899 {
 900         struct mdt_device *mdt = cookie;
 901         struct mdt_txn_info *txi;
 902         struct mdt_thread_info *mti;
 903         struct ptlrpc_request *req;
 904
 905         /* transno in two contexts - for commit_cb and for thread */
 906         txi = lu_context_key_get(&txn->th_ctx, &mdt_txn_key);
 907         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 908         req = mdt_info_req(mti);
 909
 910         if (mti->mti_mdt == NULL || req == NULL || mti->mti_no_need_trans) {
 911                 txi->txi_transno = 0;
 912                 mti->mti_no_need_trans = 0;
 913                 return 0;
 914         }
 915
 916         if (mti->mti_has_trans) {
 917                 /* XXX: currently there are allowed cases, but the wrong cases
 918                  * are also possible, so better check is needed here */
 919                 CDEBUG(D_INFO, "More than one transaction "LPU64"\n",
 920                        mti->mti_transno);
 921                 return 0;
 922         }
 923
 924         mti->mti_has_trans = 1;
 925         spin_lock(&mdt->mdt_transno_lock);
 926         if (txn->th_result != 0) {
 927                 if (mti->mti_transno != 0) {
 928                         CERROR("Replay transno "LPU64" failed: rc %i\n",
 929                                mti->mti_transno, txn->th_result);
 930                         mti->mti_transno = 0;
 931                 }
 932         } else if (mti->mti_transno == 0) {
 933                 mti->mti_transno = ++ mdt->mdt_last_transno;
 934         } else {
 935                 /* should be replay */
 936                 if (mti->mti_transno > mdt->mdt_last_transno)
 937                         mdt->mdt_last_transno = mti->mti_transno;
 938         }
 939
 940         /* sometimes the reply message has not been successfully packed */
 941         LASSERT(req != NULL && req->rq_repmsg != NULL);
 942
 943         /* filling reply data */
 944         CDEBUG(D_INODE, "transno = %llu, last_committed = %llu\n",
 945                mti->mti_transno, req->rq_export->exp_obd->obd_last_committed);
 946
 947         req->rq_transno = mti->mti_transno;
 948         lustre_msg_set_transno(req->rq_repmsg, mti->mti_transno);
 949         lustre_msg_set_last_xid(req->rq_repmsg,
 950                          lcd_last_xid(req->rq_export->exp_mdt_data.med_lcd));
 951         /* save transno for the commit callback */
 952         txi->txi_transno = mti->mti_transno;
 953         spin_unlock(&mdt->mdt_transno_lock);
 954
 955         return mdt_last_rcvd_update(mti, txn);
 956 }
 957
 958 /* commit callback, need to update last_committed value */
 959 static int mdt_txn_commit_cb(const struct lu_env *env,
 960                              struct thandle *txn, void *cookie)
 961 {
 962         struct mdt_device *mdt = cookie;
 963         struct obd_device *obd = mdt2obd_dev(mdt);
 964         struct mdt_txn_info *txi;
 965         int i;
 966
 967         txi = lu_context_key_get(&txn->th_ctx, &mdt_txn_key);
 968
 969         /* copy of obd_transno_commit_cb() but with locking */
 970         spin_lock(&mdt->mdt_transno_lock);
 971         if (txi->txi_transno > obd->obd_last_committed) {
 972                 obd->obd_last_committed = txi->txi_transno;
 973                 spin_unlock(&mdt->mdt_transno_lock);
 974                 ptlrpc_commit_replies(obd);
 975         } else
 976                 spin_unlock(&mdt->mdt_transno_lock);
 977
 978         if (txi->txi_transno)
 979                 CDEBUG(D_HA, "%s: transno "LPD64" is committed\n",
 980                        obd->obd_name, txi->txi_transno);
 981
 982         /* iterate through all additional callbacks */
 983         for (i = 0; i < txi->txi_cb_count; i++) {
 984                 txi->txi_cb[i].mdt_cb_func(mdt, txi->txi_transno,
 985                                            txi->txi_cb[i].mdt_cb_data, 0);
 986         }
 987         return 0;
 988 }
 989
 990 int mdt_fs_setup(const struct lu_env *env, struct mdt_device *mdt,
 991                  struct obd_device *obd,
 992                  struct lustre_sb_info *lsi)
 993 {
 994         struct lu_fid fid;
 995         struct dt_object *o;
 996         int rc = 0;
 997         ENTRY;
 998
 999         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_FS_SETUP))
1000                 RETURN(-ENOENT);
1001
1002         /* prepare transactions callbacks */
1003         mdt->mdt_txn_cb.dtc_txn_start = mdt_txn_start_cb;
1004         mdt->mdt_txn_cb.dtc_txn_stop = mdt_txn_stop_cb;
1005         mdt->mdt_txn_cb.dtc_txn_commit = mdt_txn_commit_cb;
1006         mdt->mdt_txn_cb.dtc_cookie = mdt;
1007         CFS_INIT_LIST_HEAD(&mdt->mdt_txn_cb.dtc_linkage);
1008
1009         dt_txn_callback_add(mdt->mdt_bottom, &mdt->mdt_txn_cb);
1010
1011         o = dt_store_open(env, mdt->mdt_bottom, "", LAST_RCVD, &fid);
1012         if (!IS_ERR(o)) {
1013                 mdt->mdt_last_rcvd = o;
1014                 rc = mdt_server_data_init(env, mdt, lsi);
1015                 if (rc)
1016                         GOTO(put_last_rcvd, rc);
1017         } else {
1018                 rc = PTR_ERR(o);
1019                 CERROR("cannot open %s: rc = %d\n", LAST_RCVD, rc);
1020                 RETURN(rc);
1021         }
1022
1023         o = dt_store_open(env, mdt->mdt_bottom, "", CAPA_KEYS, &fid);
1024         if (!IS_ERR(o)) {
1025                 mdt->mdt_ck_obj = o;
1026                 rc = mdt_capa_keys_init(env, mdt);
1027                 if (rc)
1028                         GOTO(put_ck_object, rc);
1029         } else {
1030                 rc = PTR_ERR(o);
1031                 CERROR("cannot open %s: rc = %d\n", CAPA_KEYS, rc);
1032                 GOTO(put_last_rcvd, rc);
1033         }
1034         RETURN(0);
1035
1036 put_ck_object:
1037         lu_object_put(env, &o->do_lu);
1038         mdt->mdt_ck_obj = NULL;
1039 put_last_rcvd:
1040         lu_object_put(env, &mdt->mdt_last_rcvd->do_lu);
1041         mdt->mdt_last_rcvd = NULL;
1042         return rc;
1043 }
1044
1045 void mdt_fs_cleanup(const struct lu_env *env, struct mdt_device *mdt)
1046 {
1047         ENTRY;
1048
1049         /* Remove transaction callback */
1050         dt_txn_callback_del(mdt->mdt_bottom, &mdt->mdt_txn_cb);
1051         if (mdt->mdt_last_rcvd)
1052                 lu_object_put(env, &mdt->mdt_last_rcvd->do_lu);
1053         mdt->mdt_last_rcvd = NULL;
1054         if (mdt->mdt_ck_obj)
1055                 lu_object_put(env, &mdt->mdt_ck_obj->do_lu);
1056         mdt->mdt_ck_obj = NULL;
1057         EXIT;
1058 }
1059
1060 /* reconstruction code */
1061 static void mdt_steal_ack_locks(struct ptlrpc_request *req)
1062 {
1063         struct obd_export         *exp = req->rq_export;
1064         struct list_head          *tmp;
1065         struct ptlrpc_reply_state *oldrep;
1066         struct ptlrpc_service     *svc;
1067         int                        i;
1068
1069         /* CAVEAT EMPTOR: spinlock order */
1070         spin_lock(&exp->exp_lock);
1071         list_for_each (tmp, &exp->exp_outstanding_replies) {
1072                 oldrep = list_entry(tmp, struct ptlrpc_reply_state,rs_exp_list);
1073
1074                 if (oldrep->rs_xid != req->rq_xid)
1075                         continue;
1076
1077                 if (lustre_msg_get_opc(oldrep->rs_msg) !=
1078                     lustre_msg_get_opc(req->rq_reqmsg))
1079                         CERROR ("Resent req xid "LPX64" has mismatched opc: "
1080                                 "new %d old %d\n", req->rq_xid,
1081                                 lustre_msg_get_opc(req->rq_reqmsg),
1082                                 lustre_msg_get_opc(oldrep->rs_msg));
1083
1084                 svc = oldrep->rs_service;
1085                 spin_lock (&svc->srv_lock);
1086
1087                 list_del_init (&oldrep->rs_exp_list);
1088
1089                 CWARN("Stealing %d locks from rs %p x"LPD64".t"LPD64
1090                       " o%d NID %s\n",
1091                       oldrep->rs_nlocks, oldrep,
1092                       oldrep->rs_xid, oldrep->rs_transno,
1093                       lustre_msg_get_opc(oldrep->rs_msg),
1094                       libcfs_nid2str(exp->exp_connection->c_peer.nid));
1095
1096                 for (i = 0; i < oldrep->rs_nlocks; i++)
1097                         ptlrpc_save_lock(req, &oldrep->rs_locks[i],
1098                                          oldrep->rs_modes[i], 0);
1099                 oldrep->rs_nlocks = 0;
1100
1101                 DEBUG_REQ(D_HA, req, "stole locks for");
1102                 ptlrpc_schedule_difficult_reply (oldrep);
1103
1104                 spin_unlock (&svc->srv_lock);
1105                 break;
1106         }
1107         spin_unlock(&exp->exp_lock);
1108 }
1109
1110 void mdt_req_from_lcd(struct ptlrpc_request *req,
1111                       struct lsd_client_data *lcd)
1112 {
1113         DEBUG_REQ(D_HA, req, "restoring transno "LPD64"/status %d",
1114                   lcd->lcd_last_transno, lcd->lcd_last_result);
1115
1116         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
1117             lustre_msg_get_opc(req->rq_repmsg) == MDS_DONE_WRITING) {
1118                 req->rq_transno = lcd->lcd_last_close_transno;
1119                 req->rq_status = lcd->lcd_last_close_result;
1120                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
1121                 lustre_msg_set_status(req->rq_repmsg, req->rq_status);
1122         } else {
1123                 req->rq_transno = lcd->lcd_last_transno;
1124                 req->rq_status = lcd->lcd_last_result;
1125                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
1126                 lustre_msg_set_status(req->rq_repmsg, req->rq_status);
1127         }
1128         mdt_steal_ack_locks(req);
1129 }
1130
1131 void mdt_reconstruct_generic(struct mdt_thread_info *mti,
1132                              struct mdt_lock_handle *lhc)
1133 {
1134         struct ptlrpc_request *req = mdt_info_req(mti);
1135         struct mdt_export_data *med = &req->rq_export->exp_mdt_data;
1136
1137         return mdt_req_from_lcd(req, med->med_lcd);
1138 }
1139
1140 static void mdt_reconstruct_create(struct mdt_thread_info *mti,
1141                                    struct mdt_lock_handle *lhc)
1142 {
1143         struct ptlrpc_request  *req = mdt_info_req(mti);
1144         struct obd_export *exp = req->rq_export;
1145         struct mdt_export_data *med = &exp->exp_mdt_data;
1146         struct mdt_device *mdt = mti->mti_mdt;
1147         struct mdt_object *child;
1148         struct mdt_body *body;
1149         int rc;
1150
1151         mdt_req_from_lcd(req, med->med_lcd);
1152         if (req->rq_status)
1153                 return;
1154
1155         /* if no error, so child was created with requested fid */
1156         child = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid2);
1157         if (IS_ERR(child)) {
1158                 rc = PTR_ERR(child);
1159                 LCONSOLE_WARN("Child "DFID" lookup error %d."
1160                               " Evicting client %s with export %s.\n",
1161                               PFID(mdt_object_fid(child)), rc,
1162                               obd_uuid2str(&exp->exp_client_uuid),
1163                               obd_export_nid2str(exp));
1164                 mdt_export_evict(exp);
1165                 EXIT;
1166                 return;
1167         }
1168
1169         body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1170         mti->mti_attr.ma_need = MA_INODE;
1171         mti->mti_attr.ma_valid = 0;
1172         rc = mo_attr_get(mti->mti_env, mdt_object_child(child), &mti->mti_attr);
1173         if (rc == -EREMOTE) {
1174                 /* object was created on remote server */
1175                 req->rq_status = rc;
1176                 body->valid |= OBD_MD_MDS;
1177         }
1178         mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
1179                            mdt_object_fid(child));
1180         mdt_object_put(mti->mti_env, child);
1181 }
1182
1183 static void mdt_reconstruct_setattr(struct mdt_thread_info *mti,
1184                                     struct mdt_lock_handle *lhc)
1185 {
1186         struct ptlrpc_request  *req = mdt_info_req(mti);
1187         struct obd_export *exp = req->rq_export;
1188         struct mdt_export_data *med = &exp->exp_mdt_data;
1189         struct mdt_device *mdt = mti->mti_mdt;
1190         struct mdt_object *obj;
1191         struct mdt_body *body;
1192
1193         mdt_req_from_lcd(req, med->med_lcd);
1194         if (req->rq_status)
1195                 return;
1196
1197         body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1198         obj = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid1);
1199         if (IS_ERR(obj)) {
1200                 int rc = PTR_ERR(obj);
1201                 LCONSOLE_WARN(""DFID" lookup error %d."
1202                               " Evicting client %s with export %s.\n",
1203                               PFID(mdt_object_fid(obj)), rc,
1204                               obd_uuid2str(&exp->exp_client_uuid),
1205                               obd_export_nid2str(exp));
1206                 mdt_export_evict(exp);
1207                 EXIT;
1208                 return;
1209         }
1210         mti->mti_attr.ma_need = MA_INODE;
1211         mti->mti_attr.ma_valid = 0;
1212         mo_attr_get(mti->mti_env, mdt_object_child(obj), &mti->mti_attr);
1213         mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
1214                            mdt_object_fid(obj));
1215         if (mti->mti_epoch && (mti->mti_epoch->flags & MF_EPOCH_OPEN)) {
1216                 struct mdt_file_data *mfd;
1217                 struct mdt_body *repbody;
1218
1219                 repbody = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1220                 repbody->ioepoch = obj->mot_ioepoch;
1221                 spin_lock(&med->med_open_lock);
1222                 list_for_each_entry(mfd, &med->med_open_head, mfd_list) {
1223                         if (mfd->mfd_xid == req->rq_xid)
1224                                 break;
1225                 }
1226                 LASSERT(&mfd->mfd_list != &med->med_open_head);
1227                 spin_unlock(&med->med_open_lock);
1228                 repbody->handle.cookie = mfd->mfd_handle.h_cookie;
1229         }
1230
1231         mdt_object_put(mti->mti_env, obj);
1232 }
1233
1234 typedef void (*mdt_reconstructor)(struct mdt_thread_info *mti,
1235                                   struct mdt_lock_handle *lhc);
1236
1237 static mdt_reconstructor reconstructors[REINT_MAX] = {
1238         [REINT_SETATTR]  = mdt_reconstruct_setattr,
1239         [REINT_CREATE]   = mdt_reconstruct_create,
1240         [REINT_LINK]     = mdt_reconstruct_generic,
1241         [REINT_UNLINK]   = mdt_reconstruct_generic,
1242         [REINT_RENAME]   = mdt_reconstruct_generic,
1243         [REINT_OPEN]     = mdt_reconstruct_open,
1244         [REINT_SETXATTR] = mdt_reconstruct_generic
1245 };
1246
1247 void mdt_reconstruct(struct mdt_thread_info *mti,
1248                      struct mdt_lock_handle *lhc)
1249 {
1250         ENTRY;
1251         reconstructors[mti->mti_rr.rr_opcode](mti, lhc);
1252         EXIT;
1253 }