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 (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  30  * Use is subject to license terms.
  31  *
  32  * Copyright (c) 2011 Whamcloud, Inc.
  33  *
  34  */
  35 /*
  36  * This file is part of Lustre, http://www.lustre.org/
  37  * Lustre is a trademark of Sun Microsystems, Inc.
  38  *
  39  * lustre/mdt/mdt_recovery.c
  40  *
  41  * Lustre Metadata Target (mdt) recovery-related methods
  42  *
  43  * Author: Huang Hua <huanghua@clusterfs.com>
  44  * Author: Pershin Mike <tappro@clusterfs.com>
  45  */
  46
  47 #ifndef EXPORT_SYMTAB
  48 # define EXPORT_SYMTAB
  49 #endif
  50 #define DEBUG_SUBSYSTEM S_MDS
  51
  52 #include "mdt_internal.h"
  53
  54 static int mdt_server_data_update(const struct lu_env *env,
  55                                   struct mdt_device *mdt);
  56
  57 struct lu_buf *mdt_buf(const struct lu_env *env, void *area, ssize_t len)
  58 {
  59         struct lu_buf *buf;
  60         struct mdt_thread_info *mti;
  61
  62         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
  63         buf = &mti->mti_buf;
  64         buf->lb_buf = area;
  65         buf->lb_len = len;
  66         return buf;
  67 }
  68
  69 const struct lu_buf *mdt_buf_const(const struct lu_env *env,
  70                                    const void *area, ssize_t len)
  71 {
  72         struct lu_buf *buf;
  73         struct mdt_thread_info *mti;
  74
  75         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
  76         buf = &mti->mti_buf;
  77
  78         buf->lb_buf = (void *)area;
  79         buf->lb_len = len;
  80         return buf;
  81 }
  82
  83 static inline int mdt_trans_credit_get(const struct lu_env *env,
  84                                        struct mdt_device *mdt,
  85                                        enum mdt_txn_op op)
  86 {
  87         struct dt_device *dev = mdt->mdt_bottom;
  88         int cr;
  89         switch (op) {
  90                 case MDT_TXN_CAPA_KEYS_WRITE_OP:
  91                 case MDT_TXN_LAST_RCVD_WRITE_OP:
  92                         cr = dev->dd_ops->dt_credit_get(env,
  93                                                         dev,
  94                                                         DTO_WRITE_BLOCK);
  95                 break;
  96                 default:
  97                         LBUG();
  98         }
  99         return cr;
 100 }
 101
 102 void mdt_trans_credit_init(const struct lu_env *env,
 103                            struct mdt_device *mdt,
 104                            enum mdt_txn_op op)
 105 {
 106         struct mdt_thread_info *mti;
 107         struct txn_param *p;
 108         int cr;
 109
 110         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 111         p = &mti->mti_txn_param;
 112
 113         cr = mdt_trans_credit_get(env, mdt, op);
 114         txn_param_init(p, cr);
 115 }
 116
 117 struct thandle* mdt_trans_start(const struct lu_env *env,
 118                                 struct mdt_device *mdt)
 119 {
 120         struct mdt_thread_info *mti;
 121         struct txn_param *p;
 122
 123         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 124         p = &mti->mti_txn_param;
 125
 126         /* export can require sync operations */
 127         if (mti->mti_exp != NULL)
 128                 p->tp_sync = mti->mti_exp->exp_need_sync;
 129
 130         return mdt->mdt_bottom->dd_ops->dt_trans_start(env, mdt->mdt_bottom, p);
 131 }
 132
 133 void mdt_trans_stop(const struct lu_env *env,
 134                     struct mdt_device *mdt, struct thandle *th)
 135 {
 136         mdt->mdt_bottom->dd_ops->dt_trans_stop(env, th);
 137 }
 138
 139 static inline int mdt_last_rcvd_header_read(const struct lu_env *env,
 140                                             struct mdt_device *mdt)
 141 {
 142         struct mdt_thread_info *mti;
 143         int rc;
 144
 145         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 146
 147         mti->mti_off = 0;
 148         rc = dt_record_read(env, mdt->mdt_lut.lut_last_rcvd,
 149                             mdt_buf(env, &mti->mti_lsd, sizeof(mti->mti_lsd)),
 150                             &mti->mti_off);
 151         if (rc == 0)
 152                 lsd_le_to_cpu(&mti->mti_lsd, &mdt->mdt_lut.lut_lsd);
 153
 154         CDEBUG(D_INFO, "read last_rcvd header rc = %d, uuid = %s, "
 155                "last_transno = "LPU64"\n", rc, mdt->mdt_lut.lut_lsd.lsd_uuid,
 156                mdt->mdt_lut.lut_lsd.lsd_last_transno);
 157         return rc;
 158 }
 159
 160 static int mdt_last_rcvd_header_write(const struct lu_env *env,
 161                                       struct mdt_device *mdt,
 162                                       struct thandle *th)
 163 {
 164         struct mdt_thread_info *mti;
 165         int rc;
 166         ENTRY;
 167
 168         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 169
 170         mti->mti_off = 0;
 171         lsd_cpu_to_le(&mdt->mdt_lut.lut_lsd, &mti->mti_lsd);
 172
 173         rc = dt_record_write(env, mdt->mdt_lut.lut_last_rcvd,
 174                              mdt_buf_const(env, &mti->mti_lsd,
 175                                            sizeof(mti->mti_lsd)),
 176                              &mti->mti_off, th);
 177
 178         CDEBUG(D_INFO, "write last_rcvd header rc = %d, uuid = %s, "
 179                "last_transno = "LPU64"\n", rc, mdt->mdt_lut.lut_lsd.lsd_uuid,
 180                mdt->mdt_lut.lut_lsd.lsd_last_transno);
 181
 182         RETURN(rc);
 183 }
 184
 185 static int mdt_last_rcvd_read(const struct lu_env *env, struct mdt_device *mdt,
 186                               struct lsd_client_data *lcd, loff_t *off,
 187                               int index)
 188 {
 189         struct mdt_thread_info *mti;
 190         struct lsd_client_data *tmp;
 191         int rc;
 192
 193         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 194         tmp = &mti->mti_lcd;
 195         rc = dt_record_read(env, mdt->mdt_lut.lut_last_rcvd,
 196                             mdt_buf(env, tmp, sizeof(*tmp)), off);
 197         if (rc == 0) {
 198                 check_lcd(mdt2obd_dev(mdt)->obd_name, index, tmp);
 199                 lcd_le_to_cpu(tmp, lcd);
 200         }
 201
 202         CDEBUG(D_INFO, "read lcd @%d rc = %d, uuid = %s, last_transno = "LPU64
 203                ", last_xid = "LPU64", last_result = %u, last_data = %u, "
 204                "last_close_transno = "LPU64", last_close_xid = "LPU64", "
 205                "last_close_result = %u\n", (int)(*off - sizeof(*tmp)),
 206                rc, lcd->lcd_uuid, lcd->lcd_last_transno, lcd->lcd_last_xid,
 207                lcd->lcd_last_result, lcd->lcd_last_data,
 208                lcd->lcd_last_close_transno, lcd->lcd_last_close_xid,
 209                lcd->lcd_last_close_result);
 210         return rc;
 211 }
 212
 213 static int mdt_last_rcvd_write(const struct lu_env *env,
 214                                struct mdt_device *mdt,
 215                                struct lsd_client_data *lcd,
 216                                loff_t *off, struct thandle *th)
 217 {
 218         struct mdt_thread_info *mti;
 219         struct lsd_client_data *tmp;
 220         int rc;
 221
 222         LASSERT(th != NULL);
 223         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 224         tmp = &mti->mti_lcd;
 225
 226         lcd_cpu_to_le(lcd, tmp);
 227
 228         rc = dt_record_write(env, mdt->mdt_lut.lut_last_rcvd,
 229                              mdt_buf_const(env, tmp, sizeof(*tmp)), off, th);
 230
 231         CDEBUG(D_INFO, "write lcd @%d rc = %d, uuid = %s, last_transno = "LPU64
 232                ", last_xid = "LPU64", last_result = %u, last_data = %u, "
 233                "last_close_transno = "LPU64", last_close_xid = "LPU64" ,"
 234                "last_close_result = %u\n", (int)(*off - sizeof(*tmp)),
 235                rc, lcd->lcd_uuid, lcd->lcd_last_transno, lcd->lcd_last_xid,
 236                lcd->lcd_last_result, lcd->lcd_last_data,
 237                lcd->lcd_last_close_transno, lcd->lcd_last_close_xid,
 238                lcd->lcd_last_close_result);
 239         return rc;
 240 }
 241
 242 static int mdt_clients_data_init(const struct lu_env *env,
 243                                  struct mdt_device *mdt,
 244                                  unsigned long last_size)
 245 {
 246         struct lr_server_data  *lsd = &mdt->mdt_lut.lut_lsd;
 247         struct lsd_client_data *lcd;
 248         struct obd_device      *obd = mdt2obd_dev(mdt);
 249         loff_t off;
 250         int cl_idx;
 251         int rc = 0;
 252         ENTRY;
 253
 254         OBD_ALLOC_PTR(lcd);
 255         if (!lcd)
 256                 RETURN(-ENOMEM);
 257
 258         /* When we do a clean MDS shutdown, we save the last_transno into
 259          * the header.  If we find clients with higher last_transno values
 260          * then those clients may need recovery done. */
 261         LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients) == 0);
 262         for (cl_idx = 0, off = lsd->lsd_client_start;
 263              off < last_size; cl_idx++) {
 264                 __u64 last_transno;
 265                 struct obd_export *exp;
 266                 struct mdt_thread_info *mti;
 267
 268                 off = lsd->lsd_client_start +
 269                         cl_idx * lsd->lsd_client_size;
 270
 271                 rc = mdt_last_rcvd_read(env, mdt, lcd, &off, cl_idx);
 272                 if (rc) {
 273                         CERROR("error reading MDS %s idx %d, off %llu: rc %d\n",
 274                                LAST_RCVD, cl_idx, off, rc);
 275                         rc = 0;
 276                         break; /* read error shouldn't cause startup to fail */
 277                 }
 278
 279                 if (lcd->lcd_uuid[0] == '\0') {
 280                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
 281                                cl_idx);
 282                         continue;
 283                 }
 284
 285                 last_transno = lcd_last_transno(lcd);
 286
 287                 /* These exports are cleaned up by mdt_obd_disconnect(), so
 288                  * they need to be set up like real exports as
 289                  * mdt_obd_connect() does.
 290                  */
 291                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
 292                        " srv lr: "LPU64" lx: "LPU64"\n", lcd->lcd_uuid, cl_idx,
 293                        last_transno, lsd->lsd_last_transno,
 294                        lcd_last_xid(lcd));
 295
 296                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
 297                 if (IS_ERR(exp)) {
 298                         if (PTR_ERR(exp) == -EALREADY) {
 299                                 /* export already exists, zero out this one */
 300                                 CERROR("Duplicate export %s!\n", lcd->lcd_uuid);
 301                                 continue;
 302                         }
 303                         GOTO(err_client, rc = PTR_ERR(exp));
 304                 }
 305
 306                 mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 307                 LASSERT(mti != NULL);
 308                 mti->mti_exp = exp;
 309                 /* copy on-disk lcd to the export */
 310                 *exp->exp_target_data.ted_lcd = *lcd;
 311                 rc = mdt_client_add(env, mdt, cl_idx);
 312                 /* can't fail existing */
 313                 LASSERTF(rc == 0, "rc = %d\n", rc);
 314                 /* VBR: set export last committed version */
 315                 exp->exp_last_committed = last_transno;
 316                 cfs_spin_lock(&exp->exp_lock);
 317                 exp->exp_connecting = 0;
 318                 exp->exp_in_recovery = 0;
 319                 cfs_spin_unlock(&exp->exp_lock);
 320                 obd->obd_max_recoverable_clients++;
 321                 class_export_put(exp);
 322
 323                 CDEBUG(D_OTHER, "client at idx %d has last_transno="LPU64"\n",
 324                        cl_idx, last_transno);
 325                 /* protect __u64 value update */
 326                 cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 327                 mdt->mdt_lut.lut_last_transno = max(last_transno,
 328                                                 mdt->mdt_lut.lut_last_transno);
 329                 cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 330         }
 331
 332 err_client:
 333         OBD_FREE_PTR(lcd);
 334         RETURN(rc);
 335 }
 336
 337 static int mdt_server_data_init(const struct lu_env *env,
 338                                 struct mdt_device *mdt,
 339                                 struct lustre_sb_info *lsi)
 340 {
 341         struct lr_server_data  *lsd = &mdt->mdt_lut.lut_lsd;
 342         struct lsd_client_data *lcd = NULL;
 343         struct obd_device      *obd = mdt2obd_dev(mdt);
 344         struct mdt_thread_info *mti;
 345         struct dt_object       *obj;
 346         struct lu_attr         *la;
 347         struct lustre_disk_data  *ldd;
 348         unsigned long last_rcvd_size;
 349         __u64 mount_count;
 350         int rc;
 351         ENTRY;
 352
 353         /* ensure padding in the struct is the correct size */
 354         CLASSERT(offsetof(struct lr_server_data, lsd_padding) +
 355                 sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
 356         CLASSERT(offsetof(struct lsd_client_data, lcd_padding) +
 357                 sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
 358
 359         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 360         LASSERT(mti != NULL);
 361         la = &mti->mti_attr.ma_attr;
 362
 363         obj = mdt->mdt_lut.lut_last_rcvd;
 364         rc = obj->do_ops->do_attr_get(env, obj, la, BYPASS_CAPA);
 365         if (rc)
 366                 RETURN(rc);
 367
 368         last_rcvd_size = (unsigned long)la->la_size;
 369
 370         if (last_rcvd_size == 0) {
 371                 LCONSOLE_WARN("%s: new disk, initializing\n", obd->obd_name);
 372
 373                 memcpy(lsd->lsd_uuid, obd->obd_uuid.uuid,
 374                        sizeof(lsd->lsd_uuid));
 375                 lsd->lsd_last_transno = 0;
 376                 lsd->lsd_mount_count = 0;
 377                 lsd->lsd_server_size = LR_SERVER_SIZE;
 378                 lsd->lsd_client_start = LR_CLIENT_START;
 379                 lsd->lsd_client_size = LR_CLIENT_SIZE;
 380                 lsd->lsd_feature_compat = OBD_COMPAT_MDT;
 381                 lsd->lsd_feature_rocompat = OBD_ROCOMPAT_LOVOBJID;
 382                 lsd->lsd_feature_incompat = OBD_INCOMPAT_MDT |
 383                                             OBD_INCOMPAT_COMMON_LR;
 384         } else {
 385                 LCONSOLE_WARN("%s: used disk, loading\n", obd->obd_name);
 386                 rc = mdt_last_rcvd_header_read(env, mdt);
 387                 if (rc) {
 388                         CERROR("error reading MDS %s: rc %d\n", LAST_RCVD, rc);
 389                         GOTO(out, rc);
 390                 }
 391                 if (strcmp(lsd->lsd_uuid, obd->obd_uuid.uuid) != 0) {
 392                         LCONSOLE_ERROR_MSG(0x157, "Trying to start OBD %s using"
 393                                            "the wrong disk %s. Were the /dev/ "
 394                                            "assignments rearranged?\n",
 395                                            obd->obd_uuid.uuid, lsd->lsd_uuid);
 396                         GOTO(out, rc = -EINVAL);
 397                 }
 398                 lsd->lsd_feature_compat |= OBD_COMPAT_MDT;
 399                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_MDT |
 400                                              OBD_INCOMPAT_COMMON_LR;
 401         }
 402         mount_count = lsd->lsd_mount_count;
 403
 404         ldd = lsi->lsi_ldd;
 405
 406         if (lsd->lsd_feature_incompat & ~MDT_INCOMPAT_SUPP) {
 407                 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
 408                        obd->obd_name,
 409                        lsd->lsd_feature_incompat & ~MDT_INCOMPAT_SUPP);
 410                 GOTO(out, rc = -EINVAL);
 411         }
 412         if (lsd->lsd_feature_rocompat & ~MDT_ROCOMPAT_SUPP) {
 413                 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
 414                        obd->obd_name,
 415                        lsd->lsd_feature_rocompat & ~MDT_ROCOMPAT_SUPP);
 416                 /* XXX: Do something like remount filesystem read-only */
 417                 GOTO(out, rc = -EINVAL);
 418         }
 419         /** Interop: evict all clients at first boot with 1.8 last_rcvd */
 420         if (!(lsd->lsd_feature_compat & OBD_COMPAT_20)) {
 421                 if (last_rcvd_size > lsd->lsd_client_start) {
 422                         LCONSOLE_WARN("Mounting %s at first time on 1.8 FS, "
 423                                       "remove all clients for interop needs\n",
 424                                       obd->obd_name);
 425                         simple_truncate(lsi->lsi_srv_mnt->mnt_sb->s_root,
 426                                         lsi->lsi_srv_mnt, LAST_RCVD,
 427                                         lsd->lsd_client_start);
 428                         last_rcvd_size = lsd->lsd_client_start;
 429                 }
 430                 /** set 2.0 flag to upgrade/downgrade between 1.8 and 2.0 */
 431                 lsd->lsd_feature_compat |= OBD_COMPAT_20;
 432         }
 433
 434         if (ldd->ldd_flags & LDD_F_IAM_DIR)
 435                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_IAM_DIR;
 436
 437         lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
 438
 439         cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 440         mdt->mdt_lut.lut_last_transno = lsd->lsd_last_transno;
 441         cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 442
 443         CDEBUG(D_INODE, "========BEGIN DUMPING LAST_RCVD========\n");
 444         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
 445                obd->obd_name, mdt->mdt_lut.lut_last_transno);
 446         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
 447                obd->obd_name, mount_count + 1);
 448         CDEBUG(D_INODE, "%s: server data size: %u\n",
 449                obd->obd_name, lsd->lsd_server_size);
 450         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
 451                obd->obd_name, lsd->lsd_client_start);
 452         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
 453                obd->obd_name, lsd->lsd_client_size);
 454         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
 455                obd->obd_name, last_rcvd_size);
 456         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", obd->obd_name,
 457                last_rcvd_size <= lsd->lsd_client_start ? 0 :
 458                (last_rcvd_size - lsd->lsd_client_start) /
 459                 lsd->lsd_client_size);
 460         CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
 461
 462         if (!lsd->lsd_server_size || !lsd->lsd_client_start ||
 463             !lsd->lsd_client_size) {
 464                 CERROR("Bad last_rcvd contents!\n");
 465                 GOTO(out, rc = -EINVAL);
 466         }
 467
 468         rc = mdt_clients_data_init(env, mdt, last_rcvd_size);
 469         if (rc)
 470                 GOTO(err_client, rc);
 471
 472         cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 473         /* obd_last_committed is used for compatibility
 474          * with other lustre recovery code */
 475         obd->obd_last_committed = mdt->mdt_lut.lut_last_transno;
 476         cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 477
 478         obd->u.obt.obt_mount_count = mount_count + 1;
 479         obd->u.obt.obt_instance = (__u32)obd->u.obt.obt_mount_count;
 480         lsd->lsd_mount_count = obd->u.obt.obt_mount_count;
 481
 482         /* save it, so mount count and last_transno is current */
 483         rc = mdt_server_data_update(env, mdt);
 484         if (rc)
 485                 GOTO(err_client, rc);
 486
 487         RETURN(0);
 488
 489 err_client:
 490         class_disconnect_exports(obd);
 491 out:
 492         return rc;
 493 }
 494
 495 static int mdt_server_data_update(const struct lu_env *env,
 496                                   struct mdt_device *mdt)
 497 {
 498         struct mdt_thread_info *mti;
 499         struct thandle *th;
 500         int rc;
 501
 502         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 503
 504         mdt_trans_credit_init(env, mdt, MDT_TXN_LAST_RCVD_WRITE_OP);
 505         th = mdt_trans_start(env, mdt);
 506         if (IS_ERR(th))
 507                 RETURN(PTR_ERR(th));
 508
 509         CDEBUG(D_SUPER, "MDS mount_count is "LPU64", last_transno is "LPU64"\n",
 510                mdt->mdt_lut.lut_obd->u.obt.obt_mount_count,
 511                mdt->mdt_lut.lut_last_transno);
 512
 513         cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 514         mdt->mdt_lut.lut_lsd.lsd_last_transno = mdt->mdt_lut.lut_last_transno;
 515         cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 516
 517         rc = mdt_last_rcvd_header_write(env, mdt, th);
 518         mdt_trans_stop(env, mdt, th);
 519         return rc;
 520 }
 521
 522
 523 int mdt_client_new(const struct lu_env *env, struct mdt_device *mdt)
 524 {
 525         unsigned long *bitmap = mdt->mdt_lut.lut_client_bitmap;
 526         struct mdt_thread_info *mti;
 527         struct tg_export_data *ted;
 528         struct lr_server_data  *lsd = &mdt->mdt_lut.lut_lsd;
 529         struct obd_device *obd = mdt2obd_dev(mdt);
 530         struct thandle *th;
 531         loff_t off;
 532         int rc;
 533         int cl_idx;
 534         ENTRY;
 535
 536         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 537         LASSERT(mti != NULL);
 538
 539         ted = &mti->mti_exp->exp_target_data;
 540
 541         LASSERT(bitmap != NULL);
 542         if (!strcmp(ted->ted_lcd->lcd_uuid, obd->obd_uuid.uuid))
 543                 RETURN(0);
 544
 545         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 546          * there's no need for extra complication here
 547          */
 548         cfs_spin_lock(&mdt->mdt_lut.lut_client_bitmap_lock);
 549         cl_idx = cfs_find_first_zero_bit(bitmap, LR_MAX_CLIENTS);
 550         if (cl_idx >= LR_MAX_CLIENTS ||
 551             OBD_FAIL_CHECK(OBD_FAIL_MDS_CLIENT_ADD)) {
 552                 CERROR("no room for %u clients - fix LR_MAX_CLIENTS\n",
 553                        cl_idx);
 554                 cfs_spin_unlock(&mdt->mdt_lut.lut_client_bitmap_lock);
 555                 RETURN(-EOVERFLOW);
 556         }
 557         cfs_set_bit(cl_idx, bitmap);
 558         cfs_spin_unlock(&mdt->mdt_lut.lut_client_bitmap_lock);
 559
 560         CDEBUG(D_INFO, "client at idx %d with UUID '%s' added\n",
 561                cl_idx, ted->ted_lcd->lcd_uuid);
 562
 563         ted->ted_lr_idx = cl_idx;
 564         ted->ted_lr_off = lsd->lsd_client_start +
 565                           (cl_idx * lsd->lsd_client_size);
 566         cfs_init_mutex(&ted->ted_lcd_lock);
 567
 568         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 569
 570         /* Write new client data. */
 571         off = ted->ted_lr_off;
 572
 573         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_CLIENT_ADD))
 574                 RETURN(-ENOSPC);
 575
 576         mdt_trans_credit_init(env, mdt, MDT_TXN_LAST_RCVD_WRITE_OP);
 577
 578         th = mdt_trans_start(env, mdt);
 579         if (IS_ERR(th))
 580                 RETURN(PTR_ERR(th));
 581
 582         /*
 583          * Until this operations will be committed the sync is needed
 584          * for this export. This should be done _after_ starting the
 585          * transaction so that many connecting clients will not bring
 586          * server down with lots of sync writes.
 587          */
 588         mdt_trans_add_cb(th, lut_cb_client, class_export_cb_get(mti->mti_exp));
 589         cfs_spin_lock(&mti->mti_exp->exp_lock);
 590         mti->mti_exp->exp_need_sync = 1;
 591         cfs_spin_unlock(&mti->mti_exp->exp_lock);
 592
 593         rc = mdt_last_rcvd_write(env, mdt, ted->ted_lcd, &off, th);
 594         CDEBUG(D_INFO, "wrote client lcd at idx %u off %llu (len %u)\n",
 595                cl_idx, ted->ted_lr_off, (int)sizeof(*(ted->ted_lcd)));
 596         mdt_trans_stop(env, mdt, th);
 597
 598         RETURN(rc);
 599 }
 600
 601 /* Add client data to the MDS.  We use a bitmap to locate a free space
 602  * in the last_rcvd file if cl_off is -1 (i.e. a new client).
 603  * Otherwise, we just have to read the data from the last_rcvd file and
 604  * we know its offset.
 605  *
 606  * It should not be possible to fail adding an existing client - otherwise
 607  * mdt_init_server_data() callsite needs to be fixed.
 608  */
 609 int mdt_client_add(const struct lu_env *env,
 610                    struct mdt_device *mdt, int cl_idx)
 611 {
 612         struct mdt_thread_info *mti;
 613         struct tg_export_data  *ted;
 614         unsigned long *bitmap = mdt->mdt_lut.lut_client_bitmap;
 615         struct obd_device *obd = mdt2obd_dev(mdt);
 616         struct lr_server_data *lsd = &mdt->mdt_lut.lut_lsd;
 617         int rc = 0;
 618         ENTRY;
 619
 620         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 621         LASSERT(mti != NULL);
 622
 623         ted = &mti->mti_exp->exp_target_data;
 624
 625         LASSERT(bitmap != NULL);
 626         LASSERTF(cl_idx >= 0, "%d\n", cl_idx);
 627
 628         if (!strcmp(ted->ted_lcd->lcd_uuid, obd->obd_uuid.uuid))
 629                 RETURN(0);
 630
 631         cfs_spin_lock(&mdt->mdt_lut.lut_client_bitmap_lock);
 632         if (cfs_test_and_set_bit(cl_idx, bitmap)) {
 633                 CERROR("MDS client %d: bit already set in bitmap!!\n",
 634                        cl_idx);
 635                 LBUG();
 636         }
 637         cfs_spin_unlock(&mdt->mdt_lut.lut_client_bitmap_lock);
 638
 639         CDEBUG(D_INFO, "client at idx %d with UUID '%s' added\n",
 640                cl_idx, ted->ted_lcd->lcd_uuid);
 641
 642         ted->ted_lr_idx = cl_idx;
 643         ted->ted_lr_off = lsd->lsd_client_start +
 644                           (cl_idx * lsd->lsd_client_size);
 645         cfs_init_mutex(&ted->ted_lcd_lock);
 646
 647         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 648
 649         RETURN(rc);
 650 }
 651
 652 int mdt_client_del(const struct lu_env *env, struct mdt_device *mdt)
 653 {
 654         struct mdt_thread_info *mti;
 655         struct tg_export_data  *ted;
 656         struct obd_device      *obd = mdt2obd_dev(mdt);
 657         struct obd_export      *exp;
 658         struct thandle         *th;
 659         loff_t                  off;
 660         int                     rc = 0;
 661         ENTRY;
 662
 663         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 664         LASSERT(mti != NULL);
 665
 666         exp = mti->mti_exp;
 667         ted = &exp->exp_target_data;
 668         if (!ted->ted_lcd)
 669                 RETURN(0);
 670
 671         /* XXX: If lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 672         if (!strcmp(ted->ted_lcd->lcd_uuid, obd->obd_uuid.uuid))
 673                 GOTO(free, 0);
 674
 675         CDEBUG(D_INFO, "freeing client at idx %u, offset %lld\n",
 676                ted->ted_lr_idx, ted->ted_lr_off);
 677
 678         off = ted->ted_lr_off;
 679
 680         /*
 681          * Don't clear ted_lr_idx here as it is likely also unset.  At worst we
 682          * leak a client slot that will be cleaned on the next recovery.
 683          */
 684         if (off <= 0) {
 685                 CERROR("client idx %d has offset %lld\n",
 686                         ted->ted_lr_idx, off);
 687                 GOTO(free, rc = -EINVAL);
 688         }
 689
 690         /*
 691          * Clear the bit _after_ zeroing out the client so we don't race with
 692          * mdt_client_add and zero out new clients.
 693          */
 694         if (!cfs_test_bit(ted->ted_lr_idx, mdt->mdt_lut.lut_client_bitmap)) {
 695                 CERROR("MDT client %u: bit already clear in bitmap!!\n",
 696                        ted->ted_lr_idx);
 697                 LBUG();
 698         }
 699
 700         /* Make sure the server's last_transno is up to date.
 701          * This should be done before zeroing client slot so last_transno will
 702          * be in server data or in client data in case of failure */
 703         mdt_server_data_update(env, mdt);
 704
 705         mdt_trans_credit_init(env, mdt, MDT_TXN_LAST_RCVD_WRITE_OP);
 706         th = mdt_trans_start(env, mdt);
 707         if (IS_ERR(th))
 708                 GOTO(free, rc = PTR_ERR(th));
 709
 710         cfs_mutex_down(&ted->ted_lcd_lock);
 711         memset(ted->ted_lcd->lcd_uuid, 0, sizeof ted->ted_lcd->lcd_uuid);
 712         rc = mdt_last_rcvd_write(env, mdt, ted->ted_lcd, &off, th);
 713         cfs_mutex_up(&ted->ted_lcd_lock);
 714         mdt_trans_stop(env, mdt, th);
 715
 716         CDEBUG(rc == 0 ? D_INFO : D_ERROR, "Zeroing out client idx %u in "
 717                "%s, rc %d\n",  ted->ted_lr_idx, LAST_RCVD, rc);
 718         RETURN(0);
 719 free:
 720         return 0;
 721 }
 722
 723 /*
 724  * last_rcvd & last_committed update callbacks
 725  */
 726 static int mdt_last_rcvd_update(struct mdt_thread_info *mti,
 727                                 struct thandle *th)
 728 {
 729         struct mdt_device *mdt = mti->mti_mdt;
 730         struct ptlrpc_request *req = mdt_info_req(mti);
 731         struct tg_export_data *ted;
 732         struct lsd_client_data *lcd;
 733         loff_t off;
 734         int err;
 735         __s32 rc = th->th_result;
 736
 737         ENTRY;
 738         LASSERT(req);
 739         LASSERT(req->rq_export);
 740         LASSERT(mdt);
 741         ted = &req->rq_export->exp_target_data;
 742         LASSERT(ted);
 743
 744         cfs_mutex_down(&ted->ted_lcd_lock);
 745         lcd = ted->ted_lcd;
 746         /* if the export has already been disconnected, we have no last_rcvd slot,
 747          * update server data with latest transno then */
 748         if (lcd == NULL) {
 749                 cfs_mutex_up(&ted->ted_lcd_lock);
 750                 CWARN("commit transaction for disconnected client %s: rc %d\n",
 751                       req->rq_export->exp_client_uuid.uuid, rc);
 752                 err = mdt_last_rcvd_header_write(mti->mti_env, mdt, th);
 753                 RETURN(err);
 754         }
 755
 756         off = ted->ted_lr_off;
 757         LASSERT(ergo(mti->mti_transno == 0, rc != 0));
 758         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
 759             lustre_msg_get_opc(req->rq_reqmsg) == MDS_DONE_WRITING) {
 760                 if (mti->mti_transno != 0) {
 761                         if (lcd->lcd_last_close_transno > mti->mti_transno) {
 762                                 CERROR("Trying to overwrite bigger transno:"
 763                                        "on-disk: "LPU64", new: "LPU64" "
 764                                        "replay: %d. see LU-617.\n",
 765                                        lcd->lcd_last_close_transno,
 766                                        mti->mti_transno, req_is_replay(req));
 767                                 if (req_is_replay(req)) {
 768                                         cfs_spin_lock(&req->rq_export->exp_lock);
 769                                         req->rq_export->exp_vbr_failed = 1;
 770                                         cfs_spin_unlock(&req->rq_export->exp_lock);
 771                                 }
 772                                 cfs_mutex_up(&ted->ted_lcd_lock);
 773                                 RETURN(req_is_replay(req) ? -EOVERFLOW : 0);
 774                         }
 775                         lcd->lcd_last_close_transno = mti->mti_transno;
 776                 }
 777                 lcd->lcd_last_close_xid = req->rq_xid;
 778                 lcd->lcd_last_close_result = rc;
 779         } else {
 780                 /* VBR: save versions in last_rcvd for reconstruct. */
 781                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
 782                 if (pre_versions) {
 783                         lcd->lcd_pre_versions[0] = pre_versions[0];
 784                         lcd->lcd_pre_versions[1] = pre_versions[1];
 785                         lcd->lcd_pre_versions[2] = pre_versions[2];
 786                         lcd->lcd_pre_versions[3] = pre_versions[3];
 787                 }
 788                 if (mti->mti_transno != 0) {
 789                         if (lcd->lcd_last_transno > mti->mti_transno) {
 790                                 CERROR("Trying to overwrite bigger transno:"
 791                                        "on-disk: "LPU64", new: "LPU64" "
 792                                        "replay: %d. see LU-617.\n",
 793                                        lcd->lcd_last_transno,
 794                                        mti->mti_transno, req_is_replay(req));
 795                                 if (req_is_replay(req)) {
 796                                         cfs_spin_lock(&req->rq_export->exp_lock);
 797                                         req->rq_export->exp_vbr_failed = 1;
 798                                         cfs_spin_unlock(&req->rq_export->exp_lock);
 799                                 }
 800                                 cfs_mutex_up(&ted->ted_lcd_lock);
 801                                 RETURN(req_is_replay(req) ? -EOVERFLOW : 0);
 802                         }
 803                         lcd->lcd_last_transno = mti->mti_transno;
 804                 }
 805                 lcd->lcd_last_xid = req->rq_xid;
 806                 lcd->lcd_last_result = rc;
 807                 /*XXX: save intent_disposition in mdt_thread_info?
 808                  * also there is bug - intent_dispostion is __u64,
 809                  * see struct ldlm_reply->lock_policy_res1; */
 810                 lcd->lcd_last_data = mti->mti_opdata;
 811         }
 812
 813         if (off <= 0) {
 814                 CERROR("client idx %d has offset %lld\n", ted->ted_lr_idx, off);
 815                 err = -EINVAL;
 816         } else {
 817                 err = mdt_last_rcvd_write(mti->mti_env, mdt, lcd, &off, th);
 818         }
 819         cfs_mutex_up(&ted->ted_lcd_lock);
 820         RETURN(err);
 821 }
 822
 823 extern struct lu_context_key mdt_thread_key;
 824
 825 /* add credits for last_rcvd update */
 826 static int mdt_txn_start_cb(const struct lu_env *env,
 827                             struct txn_param *param, void *cookie)
 828 {
 829         struct mdt_device *mdt = cookie;
 830
 831         param->tp_credits += mdt_trans_credit_get(env, mdt,
 832                                                   MDT_TXN_LAST_RCVD_WRITE_OP);
 833         return 0;
 834 }
 835
 836 /* Set new object versions */
 837 static void mdt_version_set(struct mdt_thread_info *info)
 838 {
 839         if (info->mti_mos != NULL) {
 840                 mo_version_set(info->mti_env, mdt_object_child(info->mti_mos),
 841                                info->mti_transno);
 842                 info->mti_mos = NULL;
 843         }
 844 }
 845
 846 /* Update last_rcvd records with latests transaction data */
 847 static int mdt_txn_stop_cb(const struct lu_env *env,
 848                            struct thandle *txn, void *cookie)
 849 {
 850         struct mdt_device *mdt = cookie;
 851         struct mdt_txn_info *txi;
 852         struct mdt_thread_info *mti;
 853         struct ptlrpc_request *req;
 854
 855         /* transno in two contexts - for commit_cb and for thread */
 856         txi = lu_context_key_get(&txn->th_ctx, &mdt_txn_key);
 857         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 858         req = mdt_info_req(mti);
 859
 860         if (mti->mti_mdt == NULL || req == NULL || mti->mti_no_need_trans) {
 861                 txi->txi_transno = 0;
 862                 mti->mti_no_need_trans = 0;
 863                 return 0;
 864         }
 865
 866         if (mti->mti_has_trans) {
 867                 /* XXX: currently there are allowed cases, but the wrong cases
 868                  * are also possible, so better check is needed here */
 869                 CDEBUG(D_INFO, "More than one transaction "LPU64"\n",
 870                        mti->mti_transno);
 871                 return 0;
 872         }
 873
 874         mti->mti_has_trans = 1;
 875         cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 876         if (txn->th_result != 0) {
 877                 if (mti->mti_transno != 0) {
 878                         CERROR("Replay transno "LPU64" failed: rc %d\n",
 879                                mti->mti_transno, txn->th_result);
 880                 }
 881         } else if (mti->mti_transno == 0) {
 882                 mti->mti_transno = ++ mdt->mdt_lut.lut_last_transno;
 883         } else {
 884                 /* should be replay */
 885                 if (mti->mti_transno > mdt->mdt_lut.lut_last_transno)
 886                         mdt->mdt_lut.lut_last_transno = mti->mti_transno;
 887         }
 888         cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 889         /* sometimes the reply message has not been successfully packed */
 890         LASSERT(req != NULL && req->rq_repmsg != NULL);
 891
 892         /** VBR: set new versions */
 893         if (txn->th_result == 0)
 894                 mdt_version_set(mti);
 895
 896         /* filling reply data */
 897         CDEBUG(D_INODE, "transno = "LPU64", last_committed = "LPU64"\n",
 898                mti->mti_transno, req->rq_export->exp_obd->obd_last_committed);
 899
 900         req->rq_transno = mti->mti_transno;
 901         lustre_msg_set_transno(req->rq_repmsg, mti->mti_transno);
 902         /* save transno for the commit callback */
 903         txi->txi_transno = mti->mti_transno;
 904
 905         /* add separate commit callback for transaction handling because we need
 906          * export as parameter */
 907         mdt_trans_add_cb(txn, lut_cb_last_committed,
 908                          class_export_cb_get(mti->mti_exp));
 909
 910         return mdt_last_rcvd_update(mti, txn);
 911 }
 912
 913 /* commit callback, need to update last_committed value */
 914 static int mdt_txn_commit_cb(const struct lu_env *env,
 915                              struct thandle *txn, void *cookie)
 916 {
 917         struct mdt_device *mdt = cookie;
 918         struct mdt_txn_info *txi;
 919         int i;
 920
 921         txi = lu_context_key_get(&txn->th_ctx, &mdt_txn_key);
 922
 923         /* iterate through all additional callbacks */
 924         for (i = 0; i < txi->txi_cb_count; i++) {
 925                 txi->txi_cb[i].lut_cb_func(&mdt->mdt_lut, txi->txi_transno,
 926                                            txi->txi_cb[i].lut_cb_data, 0);
 927         }
 928         return 0;
 929 }
 930
 931 int mdt_fs_setup(const struct lu_env *env, struct mdt_device *mdt,
 932                  struct obd_device *obd,
 933                  struct lustre_sb_info *lsi)
 934 {
 935         struct lu_fid fid;
 936         struct dt_object *o;
 937         int rc = 0;
 938         ENTRY;
 939
 940         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_FS_SETUP))
 941                 RETURN(-ENOENT);
 942
 943         /* prepare transactions callbacks */
 944         mdt->mdt_txn_cb.dtc_txn_start = mdt_txn_start_cb;
 945         mdt->mdt_txn_cb.dtc_txn_stop = mdt_txn_stop_cb;
 946         mdt->mdt_txn_cb.dtc_txn_commit = mdt_txn_commit_cb;
 947         mdt->mdt_txn_cb.dtc_cookie = mdt;
 948         mdt->mdt_txn_cb.dtc_tag = LCT_MD_THREAD;
 949         CFS_INIT_LIST_HEAD(&mdt->mdt_txn_cb.dtc_linkage);
 950
 951         dt_txn_callback_add(mdt->mdt_bottom, &mdt->mdt_txn_cb);
 952
 953         rc = mdt_server_data_init(env, mdt, lsi);
 954         if (rc)
 955                 RETURN(rc);
 956
 957         o = dt_store_open(env, mdt->mdt_bottom, "", CAPA_KEYS, &fid);
 958         if (!IS_ERR(o)) {
 959                 mdt->mdt_ck_obj = o;
 960                 rc = mdt_capa_keys_init(env, mdt);
 961                 if (rc)
 962                         GOTO(put_ck_object, rc);
 963         } else {
 964                 rc = PTR_ERR(o);
 965                 CERROR("cannot open %s: rc = %d\n", CAPA_KEYS, rc);
 966                 GOTO(disconnect_exports, rc);
 967         }
 968         RETURN(0);
 969
 970 put_ck_object:
 971         lu_object_put(env, &o->do_lu);
 972         mdt->mdt_ck_obj = NULL;
 973 disconnect_exports:
 974         class_disconnect_exports(obd);
 975         return rc;
 976 }
 977
 978 void mdt_fs_cleanup(const struct lu_env *env, struct mdt_device *mdt)
 979 {
 980         ENTRY;
 981
 982         /* Remove transaction callback */
 983         dt_txn_callback_del(mdt->mdt_bottom, &mdt->mdt_txn_cb);
 984         if (mdt->mdt_ck_obj)
 985                 lu_object_put(env, &mdt->mdt_ck_obj->do_lu);
 986         mdt->mdt_ck_obj = NULL;
 987         EXIT;
 988 }
 989
 990 /* reconstruction code */
 991 static void mdt_steal_ack_locks(struct ptlrpc_request *req)
 992 {
 993         struct obd_export         *exp = req->rq_export;
 994         cfs_list_t                *tmp;
 995         struct ptlrpc_reply_state *oldrep;
 996         struct ptlrpc_service     *svc;
 997         int                        i;
 998
 999         /* CAVEAT EMPTOR: spinlock order */
1000         cfs_spin_lock(&exp->exp_lock);
1001         cfs_list_for_each (tmp, &exp->exp_outstanding_replies) {
1002                 oldrep = cfs_list_entry(tmp, struct ptlrpc_reply_state,
1003                                         rs_exp_list);
1004
1005                 if (oldrep->rs_xid != req->rq_xid)
1006                         continue;
1007
1008                 if (oldrep->rs_opc != lustre_msg_get_opc(req->rq_reqmsg))
1009                         CERROR ("Resent req xid "LPU64" has mismatched opc: "
1010                                 "new %d old %d\n", req->rq_xid,
1011                                 lustre_msg_get_opc(req->rq_reqmsg),
1012                                 oldrep->rs_opc);
1013
1014                 svc = oldrep->rs_service;
1015                 cfs_spin_lock (&svc->srv_rs_lock);
1016
1017                 cfs_list_del_init (&oldrep->rs_exp_list);
1018
1019                 CWARN("Stealing %d locks from rs %p x"LPD64".t"LPD64
1020                       " o%d NID %s\n",
1021                       oldrep->rs_nlocks, oldrep,
1022                       oldrep->rs_xid, oldrep->rs_transno, oldrep->rs_opc,
1023                       libcfs_nid2str(exp->exp_connection->c_peer.nid));
1024
1025                 for (i = 0; i < oldrep->rs_nlocks; i++)
1026                         ptlrpc_save_lock(req, &oldrep->rs_locks[i],
1027                                          oldrep->rs_modes[i], 0);
1028                 oldrep->rs_nlocks = 0;
1029
1030                 DEBUG_REQ(D_HA, req, "stole locks for");
1031                 cfs_spin_lock(&oldrep->rs_lock);
1032                 ptlrpc_schedule_difficult_reply (oldrep);
1033                 cfs_spin_unlock(&oldrep->rs_lock);
1034
1035                 cfs_spin_unlock (&svc->srv_rs_lock);
1036                 break;
1037         }
1038         cfs_spin_unlock(&exp->exp_lock);
1039 }
1040
1041 /**
1042  * VBR: restore versions
1043  */
1044 void mdt_vbr_reconstruct(struct ptlrpc_request *req,
1045                          struct lsd_client_data *lcd)
1046 {
1047         __u64 pre_versions[4] = {0};
1048         pre_versions[0] = lcd->lcd_pre_versions[0];
1049         pre_versions[1] = lcd->lcd_pre_versions[1];
1050         pre_versions[2] = lcd->lcd_pre_versions[2];
1051         pre_versions[3] = lcd->lcd_pre_versions[3];
1052         lustre_msg_set_versions(req->rq_repmsg, pre_versions);
1053 }
1054
1055 void mdt_req_from_lcd(struct ptlrpc_request *req,
1056                       struct lsd_client_data *lcd)
1057 {
1058         DEBUG_REQ(D_HA, req, "restoring transno "LPD64"/status %d",
1059                   lcd->lcd_last_transno, lcd->lcd_last_result);
1060
1061         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
1062             lustre_msg_get_opc(req->rq_repmsg) == MDS_DONE_WRITING) {
1063                 req->rq_transno = lcd->lcd_last_close_transno;
1064                 req->rq_status = lcd->lcd_last_close_result;
1065         } else {
1066                 req->rq_transno = lcd->lcd_last_transno;
1067                 req->rq_status = lcd->lcd_last_result;
1068                 mdt_vbr_reconstruct(req, lcd);
1069         }
1070         if (req->rq_status != 0)
1071                 req->rq_transno = 0;
1072         lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
1073         lustre_msg_set_status(req->rq_repmsg, req->rq_status);
1074         DEBUG_REQ(D_RPCTRACE, req, "restoring transno "LPD64"/status %d",
1075                   req->rq_transno, req->rq_status);
1076
1077         mdt_steal_ack_locks(req);
1078 }
1079
1080 void mdt_reconstruct_generic(struct mdt_thread_info *mti,
1081                              struct mdt_lock_handle *lhc)
1082 {
1083         struct ptlrpc_request *req = mdt_info_req(mti);
1084         struct tg_export_data *ted = &req->rq_export->exp_target_data;
1085
1086         return mdt_req_from_lcd(req, ted->ted_lcd);
1087 }
1088
1089 static void mdt_reconstruct_create(struct mdt_thread_info *mti,
1090                                    struct mdt_lock_handle *lhc)
1091 {
1092         struct ptlrpc_request  *req = mdt_info_req(mti);
1093         struct obd_export *exp = req->rq_export;
1094         struct tg_export_data *ted = &exp->exp_target_data;
1095         struct mdt_device *mdt = mti->mti_mdt;
1096         struct mdt_object *child;
1097         struct mdt_body *body;
1098         int rc;
1099
1100         mdt_req_from_lcd(req, ted->ted_lcd);
1101         if (req->rq_status)
1102                 return;
1103
1104         /* if no error, so child was created with requested fid */
1105         child = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid2);
1106         if (IS_ERR(child)) {
1107                 rc = PTR_ERR(child);
1108                 LCONSOLE_WARN("Child "DFID" lookup error %d."
1109                               " Evicting client %s with export %s.\n",
1110                               PFID(mdt_object_fid(child)), rc,
1111                               obd_uuid2str(&exp->exp_client_uuid),
1112                               obd_export_nid2str(exp));
1113                 mdt_export_evict(exp);
1114                 EXIT;
1115                 return;
1116         }
1117
1118         body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1119         mti->mti_attr.ma_need = MA_INODE;
1120         mti->mti_attr.ma_valid = 0;
1121         rc = mo_attr_get(mti->mti_env, mdt_object_child(child), &mti->mti_attr);
1122         if (rc == -EREMOTE) {
1123                 /* object was created on remote server */
1124                 req->rq_status = rc;
1125                 body->valid |= OBD_MD_MDS;
1126         }
1127         mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
1128                            mdt_object_fid(child));
1129         mdt_object_put(mti->mti_env, child);
1130 }
1131
1132 static void mdt_reconstruct_setattr(struct mdt_thread_info *mti,
1133                                     struct mdt_lock_handle *lhc)
1134 {
1135         struct ptlrpc_request  *req = mdt_info_req(mti);
1136         struct obd_export *exp = req->rq_export;
1137         struct mdt_export_data *med = &exp->exp_mdt_data;
1138         struct mdt_device *mdt = mti->mti_mdt;
1139         struct mdt_object *obj;
1140         struct mdt_body *body;
1141
1142         mdt_req_from_lcd(req, med->med_ted.ted_lcd);
1143         if (req->rq_status)
1144                 return;
1145
1146         body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1147         obj = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid1);
1148         if (IS_ERR(obj)) {
1149                 int rc = PTR_ERR(obj);
1150                 LCONSOLE_WARN(""DFID" lookup error %d."
1151                               " Evicting client %s with export %s.\n",
1152                               PFID(mdt_object_fid(obj)), rc,
1153                               obd_uuid2str(&exp->exp_client_uuid),
1154                               obd_export_nid2str(exp));
1155                 mdt_export_evict(exp);
1156                 EXIT;
1157                 return;
1158         }
1159         mti->mti_attr.ma_need = MA_INODE;
1160         mti->mti_attr.ma_valid = 0;
1161         mo_attr_get(mti->mti_env, mdt_object_child(obj), &mti->mti_attr);
1162         mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
1163                            mdt_object_fid(obj));
1164         if (mti->mti_ioepoch && (mti->mti_ioepoch->flags & MF_EPOCH_OPEN)) {
1165                 struct mdt_file_data *mfd;
1166                 struct mdt_body *repbody;
1167
1168                 repbody = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1169                 repbody->ioepoch = obj->mot_ioepoch;
1170                 cfs_spin_lock(&med->med_open_lock);
1171                 cfs_list_for_each_entry(mfd, &med->med_open_head, mfd_list) {
1172                         if (mfd->mfd_xid == req->rq_xid)
1173                                 break;
1174                 }
1175                 LASSERT(&mfd->mfd_list != &med->med_open_head);
1176                 cfs_spin_unlock(&med->med_open_lock);
1177                 repbody->handle.cookie = mfd->mfd_handle.h_cookie;
1178         }
1179
1180         mdt_object_put(mti->mti_env, obj);
1181 }
1182
1183 typedef void (*mdt_reconstructor)(struct mdt_thread_info *mti,
1184                                   struct mdt_lock_handle *lhc);
1185
1186 static mdt_reconstructor reconstructors[REINT_MAX] = {
1187         [REINT_SETATTR]  = mdt_reconstruct_setattr,
1188         [REINT_CREATE]   = mdt_reconstruct_create,
1189         [REINT_LINK]     = mdt_reconstruct_generic,
1190         [REINT_UNLINK]   = mdt_reconstruct_generic,
1191         [REINT_RENAME]   = mdt_reconstruct_generic,
1192         [REINT_OPEN]     = mdt_reconstruct_open,
1193         [REINT_SETXATTR] = mdt_reconstruct_generic
1194 };
1195
1196 void mdt_reconstruct(struct mdt_thread_info *mti,
1197                      struct mdt_lock_handle *lhc)
1198 {
1199         ENTRY;
1200         reconstructors[mti->mti_rr.rr_opcode](mti, lhc);
1201         EXIT;
1202 }