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