lustre/mdt/mdt_recovery.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see
  20  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  *
  36  * lustre/mdt/mdt_recovery.c
  37  *
  38  * Lustre Metadata Target (mdt) recovery-related methods
  39  *
  40  * Author: Huang Hua <huanghua@clusterfs.com>
  41  * Author: Pershin Mike <tappro@clusterfs.com>
  42  */
  43
  44 #ifndef EXPORT_SYMTAB
  45 # define EXPORT_SYMTAB
  46 #endif
  47 #define DEBUG_SUBSYSTEM S_MDS
  48
  49 #include "mdt_internal.h"
  50
  51 static int mdt_server_data_update(const struct lu_env *env,
  52                                   struct mdt_device *mdt,
  53                                   int need_sync);
  54
  55 struct lu_buf *mdt_buf(const struct lu_env *env, void *area, ssize_t len)
  56 {
  57         struct lu_buf *buf;
  58         struct mdt_thread_info *mti;
  59
  60         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
  61         buf = &mti->mti_buf;
  62         buf->lb_buf = area;
  63         buf->lb_len = len;
  64         return buf;
  65 }
  66
  67 const struct lu_buf *mdt_buf_const(const struct lu_env *env,
  68                                    const void *area, ssize_t len)
  69 {
  70         struct lu_buf *buf;
  71         struct mdt_thread_info *mti;
  72
  73         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
  74         buf = &mti->mti_buf;
  75
  76         buf->lb_buf = (void *)area;
  77         buf->lb_len = len;
  78         return buf;
  79 }
  80
  81 static inline int mdt_trans_credit_get(const struct lu_env *env,
  82                                        struct mdt_device *mdt,
  83                                        enum mdt_txn_op op)
  84 {
  85         struct dt_device *dev = mdt->mdt_bottom;
  86         int cr;
  87         switch (op) {
  88                 case MDT_TXN_CAPA_KEYS_WRITE_OP:
  89                 case MDT_TXN_LAST_RCVD_WRITE_OP:
  90                         cr = dev->dd_ops->dt_credit_get(env,
  91                                                         dev,
  92                                                         DTO_WRITE_BLOCK);
  93                 break;
  94                 default:
  95                         LBUG();
  96         }
  97         return cr;
  98 }
  99
 100 void mdt_trans_credit_init(const struct lu_env *env,
 101                            struct mdt_device *mdt,
 102                            enum mdt_txn_op op)
 103 {
 104         struct mdt_thread_info *mti;
 105         struct txn_param *p;
 106         int cr;
 107
 108         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 109         p = &mti->mti_txn_param;
 110
 111         cr = mdt_trans_credit_get(env, mdt, op);
 112         txn_param_init(p, cr);
 113 }
 114
 115 struct thandle* mdt_trans_start(const struct lu_env *env,
 116                                 struct mdt_device *mdt)
 117 {
 118         struct mdt_thread_info *mti;
 119         struct txn_param *p;
 120
 121         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 122         p = &mti->mti_txn_param;
 123
 124         /* export can require sync operations */
 125         if (mti->mti_exp != NULL)
 126                 p->tp_sync = mti->mti_exp->exp_need_sync;
 127
 128         return mdt->mdt_bottom->dd_ops->dt_trans_start(env, mdt->mdt_bottom, p);
 129 }
 130
 131 void mdt_trans_stop(const struct lu_env *env,
 132                     struct mdt_device *mdt, struct thandle *th)
 133 {
 134         mdt->mdt_bottom->dd_ops->dt_trans_stop(env, th);
 135 }
 136
 137 static inline int mdt_last_rcvd_header_read(const struct lu_env *env,
 138                                             struct mdt_device *mdt)
 139 {
 140         struct mdt_thread_info *mti;
 141         int rc;
 142
 143         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 144
 145         mti->mti_off = 0;
 146         rc = dt_record_read(env, mdt->mdt_last_rcvd,
 147                             mdt_buf(env, &mti->mti_lsd, sizeof(mti->mti_lsd)),
 148                             &mti->mti_off);
 149         if (rc == 0)
 150                 lsd_le_to_cpu(&mti->mti_lsd, &mdt->mdt_lsd);
 151
 152         CDEBUG(D_INFO, "read last_rcvd header rc = %d:\n"
 153                        "uuid = %s\n"
 154                        "last_transno = "LPU64"\n",
 155                         rc, mdt->mdt_lsd.lsd_uuid,
 156                         mdt->mdt_lsd.lsd_last_transno);
 157         return rc;
 158 }
 159
 160 static inline int mdt_last_rcvd_header_write(const struct lu_env *env,
 161                                              struct mdt_device *mdt,
 162                                              int need_sync)
 163 {
 164         struct mdt_thread_info *mti;
 165         struct thandle *th;
 166         int rc;
 167         ENTRY;
 168
 169         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 170
 171         if (mti->mti_exp) {
 172                 spin_lock(&mti->mti_exp->exp_lock);
 173                 mti->mti_exp->exp_need_sync = need_sync;
 174                 spin_unlock(&mti->mti_exp->exp_lock);
 175         }
 176         mdt_trans_credit_init(env, mdt, MDT_TXN_LAST_RCVD_WRITE_OP);
 177         th = mdt_trans_start(env, mdt);
 178         if (IS_ERR(th))
 179                 RETURN(PTR_ERR(th));
 180
 181         mti->mti_off = 0;
 182         lsd_cpu_to_le(&mdt->mdt_lsd, &mti->mti_lsd);
 183
 184         if (need_sync && mti->mti_exp)
 185                 mdt_trans_add_cb(th, lut_cb_client, mti->mti_exp);
 186
 187         rc = dt_record_write(env, mdt->mdt_last_rcvd,
 188                              mdt_buf_const(env, &mti->mti_lsd,
 189                                            sizeof(mti->mti_lsd)),
 190                              &mti->mti_off, th);
 191
 192         mdt_trans_stop(env, mdt, th);
 193
 194         CDEBUG(D_INFO, "write last_rcvd header rc = %d:\n"
 195                "uuid = %s\nlast_transno = "LPU64"\n",
 196                rc, mdt->mdt_lsd.lsd_uuid, mdt->mdt_lsd.lsd_last_transno);
 197
 198         RETURN(rc);
 199 }
 200
 201 static int mdt_last_rcvd_read(const struct lu_env *env,
 202                               struct mdt_device *mdt,
 203                               struct lsd_client_data *lcd, loff_t *off)
 204 {
 205         struct mdt_thread_info *mti;
 206         struct lsd_client_data *tmp;
 207         int rc;
 208
 209         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 210         tmp = &mti->mti_lcd;
 211         rc = dt_record_read(env, mdt->mdt_last_rcvd,
 212                             mdt_buf(env, tmp, sizeof(*tmp)), off);
 213         if (rc == 0)
 214                 lcd_le_to_cpu(tmp, lcd);
 215
 216         CDEBUG(D_INFO, "read lcd @%d rc = %d:\n"
 217                        "uuid = %s\n"
 218                        "last_transno = "LPU64"\n"
 219                        "last_xid = "LPU64"\n"
 220                        "last_result = %u\n"
 221                        "last_data = %u\n"
 222                        "last_close_transno = "LPU64"\n"
 223                        "last_close_xid = "LPU64"\n"
 224                        "last_close_result = %u\n",
 225                         (int)(*off - sizeof(*tmp)),
 226                         rc,
 227                         lcd->lcd_uuid,
 228                         lcd->lcd_last_transno,
 229                         lcd->lcd_last_xid,
 230                         lcd->lcd_last_result,
 231                         lcd->lcd_last_data,
 232                         lcd->lcd_last_close_transno,
 233                         lcd->lcd_last_close_xid,
 234                         lcd->lcd_last_close_result);
 235         return rc;
 236 }
 237
 238 static int mdt_last_rcvd_write(const struct lu_env *env,
 239                                struct mdt_device *mdt,
 240                                struct lsd_client_data *lcd,
 241                                loff_t *off, struct thandle *th)
 242 {
 243         struct mdt_thread_info *mti;
 244         struct lsd_client_data *tmp;
 245         int rc;
 246
 247         LASSERT(th != NULL);
 248         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 249         tmp = &mti->mti_lcd;
 250
 251         lcd_cpu_to_le(lcd, tmp);
 252
 253         rc = dt_record_write(env, mdt->mdt_last_rcvd,
 254                              mdt_buf_const(env, tmp, sizeof(*tmp)), off, th);
 255
 256         CDEBUG(D_INFO, "write lcd @%d rc = %d:\n"
 257                        "uuid = %s\n"
 258                        "last_transno = "LPU64"\n"
 259                        "last_xid = "LPU64"\n"
 260                        "last_result = %u\n"
 261                        "last_data = %u\n"
 262                        "last_close_transno = "LPU64"\n"
 263                        "last_close_xid = "LPU64"\n"
 264                        "last_close_result = %u\n",
 265                         (int)(*off - sizeof(*tmp)),
 266                         rc,
 267                         lcd->lcd_uuid,
 268                         lcd->lcd_last_transno,
 269                         lcd->lcd_last_xid,
 270                         lcd->lcd_last_result,
 271                         lcd->lcd_last_data,
 272                         lcd->lcd_last_close_transno,
 273                         lcd->lcd_last_close_xid,
 274                         lcd->lcd_last_close_result);
 275         return rc;
 276 }
 277
 278 static int mdt_clients_data_init(const struct lu_env *env,
 279                                  struct mdt_device *mdt,
 280                                  unsigned long last_size)
 281 {
 282         struct lr_server_data  *lsd = &mdt->mdt_lsd;
 283         struct lsd_client_data *lcd = NULL;
 284         struct obd_device      *obd = mdt2obd_dev(mdt);
 285         loff_t off;
 286         int cl_idx;
 287         int rc = 0;
 288         ENTRY;
 289
 290         /* When we do a clean MDS shutdown, we save the last_transno into
 291          * the header.  If we find clients with higher last_transno values
 292          * then those clients may need recovery done. */
 293         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
 294         for (cl_idx = 0, off = lsd->lsd_client_start;
 295              off < last_size; cl_idx++) {
 296                 __u64 last_transno;
 297                 struct obd_export *exp;
 298
 299                 if (!lcd) {
 300                         OBD_ALLOC_PTR(lcd);
 301                         if (!lcd)
 302                                 RETURN(-ENOMEM);
 303                 }
 304
 305                 off = lsd->lsd_client_start +
 306                         cl_idx * lsd->lsd_client_size;
 307
 308                 rc = mdt_last_rcvd_read(env, mdt, lcd, &off);
 309                 if (rc) {
 310                         CERROR("error reading MDS %s idx %d, off %llu: rc %d\n",
 311                                LAST_RCVD, cl_idx, off, rc);
 312                         rc = 0;
 313                         break; /* read error shouldn't cause startup to fail */
 314                 }
 315
 316                 if (lcd->lcd_uuid[0] == '\0') {
 317                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
 318                                cl_idx);
 319                         continue;
 320                 }
 321
 322                 last_transno = lcd_last_transno(lcd);
 323
 324                 /* These exports are cleaned up by mdt_obd_disconnect(), so
 325                  * they need to be set up like real exports as
 326                  * mdt_obd_connect() does.
 327                  */
 328                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
 329                        " srv lr: "LPU64" lx: "LPU64"\n", lcd->lcd_uuid, cl_idx,
 330                        last_transno, lsd->lsd_last_transno,
 331                        lcd_last_xid(lcd));
 332
 333                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
 334                 if (IS_ERR(exp)) {
 335                         if (PTR_ERR(exp) == -EALREADY) {
 336                                 /* export already exists, zero out this one */
 337                                 lcd->lcd_uuid[0] = '\0';
 338                         } else {
 339                                 GOTO(err_client, rc = PTR_ERR(exp));
 340                         }
 341                 } else {
 342                         struct mdt_thread_info *mti;
 343                         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 344                         LASSERT(mti != NULL);
 345                         mti->mti_exp = exp;
 346                         exp->exp_mdt_data.med_lcd = lcd;
 347                         rc = mdt_client_add(env, mdt, cl_idx);
 348                         /* can't fail existing */
 349                         LASSERTF(rc == 0, "rc = %d\n", rc);
 350                         /* VBR: set export last committed version */
 351                         exp->exp_last_committed = last_transno;
 352                         lcd = NULL;
 353                         spin_lock(&exp->exp_lock);
 354                         exp->exp_connecting = 0;
 355                         exp->exp_in_recovery = 0;
 356                         spin_unlock(&exp->exp_lock);
 357                         obd->obd_max_recoverable_clients++;
 358                         class_export_put(exp);
 359                 }
 360
 361                 CDEBUG(D_OTHER, "client at idx %d has last_transno="LPU64"\n",
 362                        cl_idx, last_transno);
 363                 /* protect __u64 value update */
 364                 spin_lock(&mdt->mdt_transno_lock);
 365                 mdt->mdt_last_transno = max(last_transno,
 366                                             mdt->mdt_last_transno);
 367                 spin_unlock(&mdt->mdt_transno_lock);
 368         }
 369
 370 err_client:
 371         if (lcd)
 372                 OBD_FREE_PTR(lcd);
 373         RETURN(rc);
 374 }
 375
 376 static int mdt_server_data_init(const struct lu_env *env,
 377                                 struct mdt_device *mdt,
 378                                 struct lustre_sb_info *lsi)
 379 {
 380         struct lr_server_data  *lsd = &mdt->mdt_lsd;
 381         struct lsd_client_data *lcd = NULL;
 382         struct obd_device      *obd = mdt2obd_dev(mdt);
 383         struct mdt_thread_info *mti;
 384         struct dt_object       *obj;
 385         struct lu_attr         *la;
 386         struct lustre_disk_data  *ldd;
 387         unsigned long last_rcvd_size;
 388         __u64 mount_count;
 389         int rc;
 390         ENTRY;
 391
 392         /* ensure padding in the struct is the correct size */
 393         CLASSERT(offsetof(struct lr_server_data, lsd_padding) +
 394                 sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
 395         CLASSERT(offsetof(struct lsd_client_data, lcd_padding) +
 396                 sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
 397
 398         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 399         LASSERT(mti != NULL);
 400         la = &mti->mti_attr.ma_attr;
 401
 402         obj = mdt->mdt_last_rcvd;
 403         rc = obj->do_ops->do_attr_get(env, mdt->mdt_last_rcvd, la, BYPASS_CAPA);
 404         if (rc)
 405                 RETURN(rc);
 406
 407         last_rcvd_size = (unsigned long)la->la_size;
 408
 409         if (last_rcvd_size == 0) {
 410                 LCONSOLE_WARN("%s: new disk, initializing\n", obd->obd_name);
 411
 412                 memcpy(lsd->lsd_uuid, obd->obd_uuid.uuid,
 413                        sizeof(lsd->lsd_uuid));
 414                 lsd->lsd_last_transno = 0;
 415                 lsd->lsd_mount_count = 0;
 416                 lsd->lsd_server_size = LR_SERVER_SIZE;
 417                 lsd->lsd_client_start = LR_CLIENT_START;
 418                 lsd->lsd_client_size = LR_CLIENT_SIZE;
 419                 lsd->lsd_feature_compat = OBD_COMPAT_MDT;
 420                 lsd->lsd_feature_rocompat = OBD_ROCOMPAT_LOVOBJID;
 421                 lsd->lsd_feature_incompat = OBD_INCOMPAT_MDT |
 422                                             OBD_INCOMPAT_COMMON_LR;
 423         } else {
 424                 LCONSOLE_WARN("%s: used disk, loading\n", obd->obd_name);
 425                 rc = mdt_last_rcvd_header_read(env, mdt);
 426                 if (rc) {
 427                         CERROR("error reading MDS %s: rc %d\n", LAST_RCVD, rc);
 428                         GOTO(out, rc);
 429                 }
 430                 if (strcmp(lsd->lsd_uuid, obd->obd_uuid.uuid) != 0) {
 431                         LCONSOLE_ERROR_MSG(0x157, "Trying to start OBD %s using"
 432                                            "the wrong disk %s. Were the /dev/ "
 433                                            "assignments rearranged?\n",
 434                                            obd->obd_uuid.uuid, lsd->lsd_uuid);
 435                         GOTO(out, rc = -EINVAL);
 436                 }
 437                 lsd->lsd_feature_compat |= OBD_COMPAT_MDT;
 438                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_MDT |
 439                                              OBD_INCOMPAT_COMMON_LR;
 440         }
 441         mount_count = lsd->lsd_mount_count;
 442
 443         ldd = lsi->lsi_ldd;
 444
 445         if (lsd->lsd_feature_incompat & ~MDT_INCOMPAT_SUPP) {
 446                 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
 447                        obd->obd_name,
 448                        lsd->lsd_feature_incompat & ~MDT_INCOMPAT_SUPP);
 449                 GOTO(out, rc = -EINVAL);
 450         }
 451         if (lsd->lsd_feature_rocompat & ~MDT_ROCOMPAT_SUPP) {
 452                 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
 453                        obd->obd_name,
 454                        lsd->lsd_feature_rocompat & ~MDT_ROCOMPAT_SUPP);
 455                 /* XXX: Do something like remount filesystem read-only */
 456                 GOTO(out, rc = -EINVAL);
 457         }
 458         /** Interop: evict all clients at first boot with 1.8 last_rcvd */
 459         if (!(lsd->lsd_feature_compat & OBD_COMPAT_20)) {
 460                 LCONSOLE_WARN("Mounting %s at first time on 1.8 FS, remove all"
 461                               " clients for interop needs\n", obd->obd_name);
 462                 simple_truncate(lsi->lsi_srv_mnt->mnt_sb->s_root,
 463                                 lsi->lsi_srv_mnt, LAST_RCVD,
 464                                 lsd->lsd_client_start);
 465                 last_rcvd_size = lsd->lsd_client_start;
 466                 /** set 2.0 flag to upgrade/downgrade between 1.8 and 2.0 */
 467                 lsd->lsd_feature_compat |= OBD_COMPAT_20;
 468         }
 469
 470         if (ldd->ldd_flags & LDD_F_IAM_DIR)
 471                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_IAM_DIR;
 472
 473         lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
 474
 475         spin_lock(&mdt->mdt_transno_lock);
 476         mdt->mdt_last_transno = lsd->lsd_last_transno;
 477         spin_unlock(&mdt->mdt_transno_lock);
 478
 479         CDEBUG(D_INODE, "========BEGIN DUMPING LAST_RCVD========\n");
 480         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
 481                obd->obd_name, mdt->mdt_last_transno);
 482         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
 483                obd->obd_name, mount_count + 1);
 484         CDEBUG(D_INODE, "%s: server data size: %u\n",
 485                obd->obd_name, lsd->lsd_server_size);
 486         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
 487                obd->obd_name, lsd->lsd_client_start);
 488         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
 489                obd->obd_name, lsd->lsd_client_size);
 490         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
 491                obd->obd_name, last_rcvd_size);
 492         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", obd->obd_name,
 493                last_rcvd_size <= lsd->lsd_client_start ? 0 :
 494                (last_rcvd_size - lsd->lsd_client_start) /
 495                 lsd->lsd_client_size);
 496         CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
 497
 498         if (!lsd->lsd_server_size || !lsd->lsd_client_start ||
 499             !lsd->lsd_client_size) {
 500                 CERROR("Bad last_rcvd contents!\n");
 501                 GOTO(out, rc = -EINVAL);
 502         }
 503
 504         rc = mdt_clients_data_init(env, mdt, last_rcvd_size);
 505         if (rc)
 506                 GOTO(err_client, rc);
 507
 508         spin_lock(&mdt->mdt_transno_lock);
 509         /* obd_last_committed is used for compatibility
 510          * with other lustre recovery code */
 511         obd->obd_last_committed = mdt->mdt_last_transno;
 512         spin_unlock(&mdt->mdt_transno_lock);
 513
 514         mdt->mdt_mount_count = mount_count + 1;
 515         lsd->lsd_mount_count = mdt->mdt_mount_count;
 516
 517         /* save it, so mount count and last_transno is current */
 518         rc = mdt_server_data_update(env, mdt, (mti->mti_exp &&
 519                                                mti->mti_exp->exp_need_sync));
 520         if (rc)
 521                 GOTO(err_client, rc);
 522
 523         RETURN(0);
 524
 525 err_client:
 526         class_disconnect_exports(obd);
 527 out:
 528         return rc;
 529 }
 530
 531 static int mdt_server_data_update(const struct lu_env *env,
 532                                   struct mdt_device *mdt,
 533                                   int need_sync)
 534 {
 535         int rc = 0;
 536         ENTRY;
 537
 538         CDEBUG(D_SUPER, "MDS mount_count is "LPU64", last_transno is "LPU64"\n",
 539                mdt->mdt_mount_count, mdt->mdt_last_transno);
 540
 541         spin_lock(&mdt->mdt_transno_lock);
 542         mdt->mdt_lsd.lsd_last_transno = mdt->mdt_last_transno;
 543         spin_unlock(&mdt->mdt_transno_lock);
 544
 545         /*
 546          * This may be called from difficult reply handler and
 547          * mdt->mdt_last_rcvd may be NULL that time.
 548          */
 549         if (mdt->mdt_last_rcvd != NULL)
 550                 rc = mdt_last_rcvd_header_write(env, mdt, need_sync);
 551         RETURN(rc);
 552 }
 553
 554 int mdt_client_new(const struct lu_env *env, struct mdt_device *mdt)
 555 {
 556         unsigned long *bitmap = mdt->mdt_client_bitmap;
 557         struct mdt_thread_info *mti;
 558         struct mdt_export_data *med;
 559         struct lsd_client_data *lcd;
 560         struct lr_server_data  *lsd = &mdt->mdt_lsd;
 561         struct obd_device *obd = mdt2obd_dev(mdt);
 562         struct thandle *th;
 563         loff_t off;
 564         int rc;
 565         int cl_idx;
 566         ENTRY;
 567
 568         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 569         LASSERT(mti != NULL);
 570
 571         med = &mti->mti_exp->exp_mdt_data;
 572         lcd = med->med_lcd;
 573
 574         LASSERT(bitmap != NULL);
 575         if (!strcmp(med->med_lcd->lcd_uuid, obd->obd_uuid.uuid))
 576                 RETURN(0);
 577
 578         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 579          * there's no need for extra complication here
 580          */
 581         spin_lock(&mdt->mdt_client_bitmap_lock);
 582         cl_idx = find_first_zero_bit(bitmap, LR_MAX_CLIENTS);
 583         if (cl_idx >= LR_MAX_CLIENTS ||
 584             OBD_FAIL_CHECK(OBD_FAIL_MDS_CLIENT_ADD)) {
 585                 CERROR("no room for %u clients - fix LR_MAX_CLIENTS\n",
 586                        cl_idx);
 587                 spin_unlock(&mdt->mdt_client_bitmap_lock);
 588                 RETURN(-EOVERFLOW);
 589         }
 590         set_bit(cl_idx, bitmap);
 591         spin_unlock(&mdt->mdt_client_bitmap_lock);
 592
 593         CDEBUG(D_INFO, "client at idx %d with UUID '%s' added\n",
 594                cl_idx, med->med_lcd->lcd_uuid);
 595
 596         med->med_lr_idx = cl_idx;
 597         med->med_lr_off = lsd->lsd_client_start +
 598                           (cl_idx * lsd->lsd_client_size);
 599         init_mutex(&med->med_lcd_lock);
 600
 601         LASSERTF(med->med_lr_off > 0, "med_lr_off = %llu\n", med->med_lr_off);
 602
 603         /* Write new client data. */
 604         off = med->med_lr_off;
 605         mdt_trans_credit_init(env, mdt, MDT_TXN_LAST_RCVD_WRITE_OP);
 606
 607         th = mdt_trans_start(env, mdt);
 608         if (IS_ERR(th))
 609                 RETURN(PTR_ERR(th));
 610
 611         /*
 612          * Until this operations will be committed the sync is needed
 613          * for this export. This should be done _after_ starting the
 614          * transaction so that many connecting clients will not bring
 615          * server down with lots of sync writes.
 616          */
 617         mdt_trans_add_cb(th, lut_cb_client, mti->mti_exp);
 618         spin_lock(&mti->mti_exp->exp_lock);
 619         mti->mti_exp->exp_need_sync = 1;
 620         spin_unlock(&mti->mti_exp->exp_lock);
 621
 622         rc = mdt_last_rcvd_write(env, mdt, lcd, &off, th);
 623         CDEBUG(D_INFO, "wrote client lcd at idx %u off %llu (len %u)\n",
 624                cl_idx, med->med_lr_off, (int)sizeof(*lcd));
 625         mdt_trans_stop(env, mdt, th);
 626
 627         RETURN(rc);
 628 }
 629
 630 /* Add client data to the MDS.  We use a bitmap to locate a free space
 631  * in the last_rcvd file if cl_off is -1 (i.e. a new client).
 632  * Otherwise, we just have to read the data from the last_rcvd file and
 633  * we know its offset.
 634  *
 635  * It should not be possible to fail adding an existing client - otherwise
 636  * mdt_init_server_data() callsite needs to be fixed.
 637  */
 638 int mdt_client_add(const struct lu_env *env,
 639                    struct mdt_device *mdt, int cl_idx)
 640 {
 641         struct mdt_thread_info *mti;
 642         struct mdt_export_data *med;
 643         unsigned long *bitmap = mdt->mdt_client_bitmap;
 644         struct obd_device *obd = mdt2obd_dev(mdt);
 645         struct lr_server_data *lsd = &mdt->mdt_lsd;
 646         int rc = 0;
 647         ENTRY;
 648
 649         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 650         LASSERT(mti != NULL);
 651
 652         med = &mti->mti_exp->exp_mdt_data;
 653
 654         LASSERT(bitmap != NULL);
 655         LASSERTF(cl_idx >= 0, "%d\n", cl_idx);
 656
 657         if (!strcmp(med->med_lcd->lcd_uuid, obd->obd_uuid.uuid))
 658                 RETURN(0);
 659
 660         spin_lock(&mdt->mdt_client_bitmap_lock);
 661         if (test_and_set_bit(cl_idx, bitmap)) {
 662                 CERROR("MDS client %d: bit already set in bitmap!!\n",
 663                        cl_idx);
 664                 LBUG();
 665         }
 666         spin_unlock(&mdt->mdt_client_bitmap_lock);
 667
 668         CDEBUG(D_INFO, "client at idx %d with UUID '%s' added\n",
 669                cl_idx, med->med_lcd->lcd_uuid);
 670
 671         med->med_lr_idx = cl_idx;
 672         med->med_lr_off = lsd->lsd_client_start +
 673                           (cl_idx * lsd->lsd_client_size);
 674         init_mutex(&med->med_lcd_lock);
 675
 676         LASSERTF(med->med_lr_off > 0, "med_lr_off = %llu\n", med->med_lr_off);
 677
 678         RETURN(rc);
 679 }
 680
 681 int mdt_client_del(const struct lu_env *env, struct mdt_device *mdt)
 682 {
 683         struct mdt_thread_info *mti;
 684         struct mdt_export_data *med;
 685         struct lsd_client_data *lcd;
 686         struct obd_device      *obd = mdt2obd_dev(mdt);
 687         struct obd_export      *exp;
 688         struct thandle         *th;
 689         int                     need_sync;
 690         loff_t                  off;
 691         int                     rc = 0;
 692         ENTRY;
 693
 694         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 695         LASSERT(mti != NULL);
 696
 697         exp = mti->mti_exp;
 698         med = &exp->exp_mdt_data;
 699         lcd = med->med_lcd;
 700         if (!lcd)
 701                 RETURN(0);
 702
 703         /* XXX: If lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 704         if (!strcmp(lcd->lcd_uuid, obd->obd_uuid.uuid))
 705                 GOTO(free, 0);
 706
 707         CDEBUG(D_INFO, "freeing client at idx %u, offset %lld\n",
 708                med->med_lr_idx, med->med_lr_off);
 709
 710         off = med->med_lr_off;
 711
 712         /*
 713          * Don't clear med_lr_idx here as it is likely also unset.  At worst we
 714          * leak a client slot that will be cleaned on the next recovery.
 715          */
 716         if (off <= 0) {
 717                 CERROR("client idx %d has offset %lld\n",
 718                         med->med_lr_idx, off);
 719                 GOTO(free, rc = -EINVAL);
 720         }
 721
 722         /*
 723          * Clear the bit _after_ zeroing out the client so we don't race with
 724          * mdt_client_add and zero out new clients.
 725          */
 726         if (!test_bit(med->med_lr_idx, mdt->mdt_client_bitmap)) {
 727                 CERROR("MDT client %u: bit already clear in bitmap!!\n",
 728                        med->med_lr_idx);
 729                 LBUG();
 730         }
 731
 732         /* Don't force sync on disconnect if aborting recovery,
 733          * or it does num_clients * num_osts.  b=17194 */
 734         need_sync = (!exp->exp_libclient || exp->exp_need_sync) &&
 735                      !(exp->exp_flags & OBD_OPT_ABORT_RECOV);
 736
 737         /*
 738          * This may be called from difficult reply handler path and
 739          * mdt->mdt_last_rcvd may be NULL that time.
 740          */
 741         if (mdt->mdt_last_rcvd != NULL) {
 742                 mdt_trans_credit_init(env, mdt, MDT_TXN_LAST_RCVD_WRITE_OP);
 743
 744                 spin_lock(&exp->exp_lock);
 745                 exp->exp_need_sync = need_sync;
 746                 spin_unlock(&exp->exp_lock);
 747
 748                 th = mdt_trans_start(env, mdt);
 749                 if (IS_ERR(th))
 750                         GOTO(free, rc = PTR_ERR(th));
 751
 752                 if (need_sync) {
 753                         /*
 754                          * Until this operations will be committed the sync
 755                          * is needed for this export.
 756                          */
 757                         mdt_trans_add_cb(th, lut_cb_client, exp);
 758                 }
 759
 760                 mutex_down(&med->med_lcd_lock);
 761                 memset(lcd, 0, sizeof *lcd);
 762
 763                 rc = mdt_last_rcvd_write(env, mdt, lcd, &off, th);
 764                 mutex_up(&med->med_lcd_lock);
 765                 mdt_trans_stop(env, mdt, th);
 766         }
 767
 768         CDEBUG(rc == 0 ? D_INFO : D_ERROR, "Zeroing out client idx %u in "
 769                "%s %ssync rc %d\n",  med->med_lr_idx, LAST_RCVD,
 770                need_sync ? "" : "a", rc);
 771
 772         spin_lock(&mdt->mdt_client_bitmap_lock);
 773         clear_bit(med->med_lr_idx, mdt->mdt_client_bitmap);
 774         spin_unlock(&mdt->mdt_client_bitmap_lock);
 775
 776         /*
 777          * Make sure the server's last_transno is up to date. Do this
 778          * after the client is freed so we know all the client's
 779          * transactions have been committed.
 780          */
 781         mdt_server_data_update(env, mdt, need_sync);
 782
 783         EXIT;
 784 free:
 785         OBD_FREE_PTR(lcd);
 786         med->med_lcd = NULL;
 787         return 0;
 788 }
 789
 790 /*
 791  * last_rcvd & last_committed update callbacks
 792  */
 793 static int mdt_last_rcvd_update(struct mdt_thread_info *mti,
 794                                 struct thandle *th)
 795 {
 796         struct mdt_device *mdt = mti->mti_mdt;
 797         struct ptlrpc_request *req = mdt_info_req(mti);
 798         struct mdt_export_data *med;
 799         struct lsd_client_data *lcd;
 800         loff_t off;
 801         int err;
 802         __s32 rc = th->th_result;
 803
 804         ENTRY;
 805         LASSERT(req);
 806         LASSERT(req->rq_export);
 807         LASSERT(mdt);
 808         med = &req->rq_export->exp_mdt_data;
 809         LASSERT(med);
 810         lcd = med->med_lcd;
 811         /* if the export has already been failed, we have no last_rcvd slot */
 812         if (req->rq_export->exp_failed) {
 813                 CWARN("commit transaction for disconnected client %s: rc %d\n",
 814                       req->rq_export->exp_client_uuid.uuid, rc);
 815                 if (rc == 0)
 816                         rc = -ENOTCONN;
 817                 RETURN(rc);
 818         }
 819
 820         off = med->med_lr_off;
 821         LASSERT(ergo(mti->mti_transno == 0, rc != 0));
 822         mutex_down(&med->med_lcd_lock);
 823         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
 824             lustre_msg_get_opc(req->rq_reqmsg) == MDS_DONE_WRITING) {
 825                 if (mti->mti_transno != 0)
 826                         lcd->lcd_last_close_transno = mti->mti_transno;
 827                 lcd->lcd_last_close_xid = req->rq_xid;
 828                 lcd->lcd_last_close_result = rc;
 829         } else {
 830                 /* VBR: save versions in last_rcvd for reconstruct. */
 831                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
 832                 if (pre_versions) {
 833                         lcd->lcd_pre_versions[0] = pre_versions[0];
 834                         lcd->lcd_pre_versions[1] = pre_versions[1];
 835                         lcd->lcd_pre_versions[2] = pre_versions[2];
 836                         lcd->lcd_pre_versions[3] = pre_versions[3];
 837                 }
 838                 if (mti->mti_transno != 0)
 839                         lcd->lcd_last_transno = mti->mti_transno;
 840                 lcd->lcd_last_xid = req->rq_xid;
 841                 lcd->lcd_last_result = rc;
 842                 /*XXX: save intent_disposition in mdt_thread_info?
 843                  * also there is bug - intent_dispostion is __u64,
 844                  * see struct ldlm_reply->lock_policy_res1; */
 845                 lcd->lcd_last_data = mti->mti_opdata;
 846         }
 847
 848         if (off <= 0) {
 849                 CERROR("client idx %d has offset %lld\n", med->med_lr_idx, off);
 850                 err = -EINVAL;
 851         } else {
 852                 err = mdt_last_rcvd_write(mti->mti_env, mdt, lcd, &off, th);
 853         }
 854         mutex_up(&med->med_lcd_lock);
 855         RETURN(err);
 856 }
 857
 858 extern struct lu_context_key mdt_thread_key;
 859
 860 /* add credits for last_rcvd update */
 861 static int mdt_txn_start_cb(const struct lu_env *env,
 862                             struct txn_param *param, void *cookie)
 863 {
 864         struct mdt_device *mdt = cookie;
 865
 866         param->tp_credits += mdt_trans_credit_get(env, mdt,
 867                                                   MDT_TXN_LAST_RCVD_WRITE_OP);
 868         return 0;
 869 }
 870
 871 /* Set new object versions */
 872 static void mdt_versions_set(struct mdt_thread_info *info)
 873 {
 874         int i;
 875         for (i = 0; i < PTLRPC_NUM_VERSIONS; i++)
 876                 if (info->mti_mos[i] != NULL)
 877                         mo_version_set(info->mti_env,
 878                                        mdt_object_child(info->mti_mos[i]),
 879                                        info->mti_transno);
 880 }
 881
 882 /* Update last_rcvd records with latests transaction data */
 883 static int mdt_txn_stop_cb(const struct lu_env *env,
 884                            struct thandle *txn, void *cookie)
 885 {
 886         struct mdt_device *mdt = cookie;
 887         struct mdt_txn_info *txi;
 888         struct mdt_thread_info *mti;
 889         struct ptlrpc_request *req;
 890
 891         /* transno in two contexts - for commit_cb and for thread */
 892         txi = lu_context_key_get(&txn->th_ctx, &mdt_txn_key);
 893         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 894         req = mdt_info_req(mti);
 895
 896         if (mti->mti_mdt == NULL || req == NULL || mti->mti_no_need_trans) {
 897                 txi->txi_transno = 0;
 898                 mti->mti_no_need_trans = 0;
 899                 return 0;
 900         }
 901
 902         if (mti->mti_has_trans) {
 903                 /* XXX: currently there are allowed cases, but the wrong cases
 904                  * are also possible, so better check is needed here */
 905                 CDEBUG(D_INFO, "More than one transaction "LPU64"\n",
 906                        mti->mti_transno);
 907                 return 0;
 908         }
 909
 910         mti->mti_has_trans = 1;
 911         spin_lock(&mdt->mdt_transno_lock);
 912         if (txn->th_result != 0) {
 913                 if (mti->mti_transno != 0) {
 914                         CERROR("Replay transno "LPU64" failed: rc %i\n",
 915                                mti->mti_transno, txn->th_result);
 916                 }
 917         } else if (mti->mti_transno == 0) {
 918                 mti->mti_transno = ++ mdt->mdt_last_transno;
 919         } else {
 920                 /* should be replay */
 921                 if (mti->mti_transno > mdt->mdt_last_transno)
 922                         mdt->mdt_last_transno = mti->mti_transno;
 923         }
 924         spin_unlock(&mdt->mdt_transno_lock);
 925         /* sometimes the reply message has not been successfully packed */
 926         LASSERT(req != NULL && req->rq_repmsg != NULL);
 927
 928         /** VBR: set new versions */
 929         if (txn->th_result == 0)
 930                 mdt_versions_set(mti);
 931
 932         /* filling reply data */
 933         CDEBUG(D_INODE, "transno = %llu, last_committed = %llu\n",
 934                mti->mti_transno, req->rq_export->exp_obd->obd_last_committed);
 935
 936         req->rq_transno = mti->mti_transno;
 937         lustre_msg_set_transno(req->rq_repmsg, mti->mti_transno);
 938         lustre_msg_set_last_xid(req->rq_repmsg,
 939                          lcd_last_xid(req->rq_export->exp_mdt_data.med_lcd));
 940         /* save transno for the commit callback */
 941         txi->txi_transno = mti->mti_transno;
 942
 943         /* add separate commit callback for transaction handling because we need
 944          * export as parameter */
 945         mdt_trans_add_cb(txn, lut_cb_last_committed,
 946                          class_export_cb_get(mti->mti_exp));
 947
 948         return mdt_last_rcvd_update(mti, txn);
 949 }
 950
 951 /* commit callback, need to update last_committed value */
 952 static int mdt_txn_commit_cb(const struct lu_env *env,
 953                              struct thandle *txn, void *cookie)
 954 {
 955         struct mdt_device *mdt = cookie;
 956         struct mdt_txn_info *txi;
 957         int i;
 958
 959         txi = lu_context_key_get(&txn->th_ctx, &mdt_txn_key);
 960
 961         /* iterate through all additional callbacks */
 962         for (i = 0; i < txi->txi_cb_count; i++) {
 963                 txi->txi_cb[i].lut_cb_func(&mdt->mdt_lut, txi->txi_transno,
 964                                            txi->txi_cb[i].lut_cb_data, 0);
 965         }
 966         return 0;
 967 }
 968
 969 int mdt_fs_setup(const struct lu_env *env, struct mdt_device *mdt,
 970                  struct obd_device *obd,
 971                  struct lustre_sb_info *lsi)
 972 {
 973         struct lu_fid fid;
 974         struct dt_object *o;
 975         int rc = 0;
 976         ENTRY;
 977
 978         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_FS_SETUP))
 979                 RETURN(-ENOENT);
 980
 981         /* prepare transactions callbacks */
 982         mdt->mdt_txn_cb.dtc_txn_start = mdt_txn_start_cb;
 983         mdt->mdt_txn_cb.dtc_txn_stop = mdt_txn_stop_cb;
 984         mdt->mdt_txn_cb.dtc_txn_commit = mdt_txn_commit_cb;
 985         mdt->mdt_txn_cb.dtc_cookie = mdt;
 986         mdt->mdt_txn_cb.dtc_tag = LCT_MD_THREAD;
 987         CFS_INIT_LIST_HEAD(&mdt->mdt_txn_cb.dtc_linkage);
 988
 989         dt_txn_callback_add(mdt->mdt_bottom, &mdt->mdt_txn_cb);
 990
 991         rc = mdt_server_data_init(env, mdt, lsi);
 992         if (rc)
 993                 RETURN(rc);
 994
 995         o = dt_store_open(env, mdt->mdt_bottom, "", CAPA_KEYS, &fid);
 996         if (!IS_ERR(o)) {
 997                 mdt->mdt_ck_obj = o;
 998                 rc = mdt_capa_keys_init(env, mdt);
 999                 if (rc)
1000                         GOTO(put_ck_object, rc);
1001         } else {
1002                 rc = PTR_ERR(o);
1003                 CERROR("cannot open %s: rc = %d\n", CAPA_KEYS, rc);
1004                 GOTO(disconnect_exports, rc);
1005         }
1006         RETURN(0);
1007
1008 put_ck_object:
1009         lu_object_put(env, &o->do_lu);
1010         mdt->mdt_ck_obj = NULL;
1011 disconnect_exports:
1012         class_disconnect_exports(obd);
1013         return rc;
1014 }
1015
1016 void mdt_fs_cleanup(const struct lu_env *env, struct mdt_device *mdt)
1017 {
1018         ENTRY;
1019
1020         /* Remove transaction callback */
1021         dt_txn_callback_del(mdt->mdt_bottom, &mdt->mdt_txn_cb);
1022         if (mdt->mdt_ck_obj)
1023                 lu_object_put(env, &mdt->mdt_ck_obj->do_lu);
1024         mdt->mdt_ck_obj = NULL;
1025         EXIT;
1026 }
1027
1028 /* reconstruction code */
1029 static void mdt_steal_ack_locks(struct ptlrpc_request *req)
1030 {
1031         struct obd_export         *exp = req->rq_export;
1032         struct list_head          *tmp;
1033         struct ptlrpc_reply_state *oldrep;
1034         struct ptlrpc_service     *svc;
1035         int                        i;
1036
1037         /* CAVEAT EMPTOR: spinlock order */
1038         spin_lock(&exp->exp_lock);
1039         list_for_each (tmp, &exp->exp_outstanding_replies) {
1040                 oldrep = list_entry(tmp, struct ptlrpc_reply_state,rs_exp_list);
1041
1042                 if (oldrep->rs_xid != req->rq_xid)
1043                         continue;
1044
1045                 if (oldrep->rs_opc != lustre_msg_get_opc(req->rq_reqmsg))
1046                         CERROR ("Resent req xid "LPU64" has mismatched opc: "
1047                                 "new %d old %d\n", req->rq_xid,
1048                                 lustre_msg_get_opc(req->rq_reqmsg),
1049                                 oldrep->rs_opc);
1050
1051                 svc = oldrep->rs_service;
1052                 spin_lock (&svc->srv_lock);
1053
1054                 list_del_init (&oldrep->rs_exp_list);
1055
1056                 CWARN("Stealing %d locks from rs %p x"LPD64".t"LPD64
1057                       " o%d NID %s\n",
1058                       oldrep->rs_nlocks, oldrep,
1059                       oldrep->rs_xid, oldrep->rs_transno, oldrep->rs_opc,
1060                       libcfs_nid2str(exp->exp_connection->c_peer.nid));
1061
1062                 for (i = 0; i < oldrep->rs_nlocks; i++)
1063                         ptlrpc_save_lock(req, &oldrep->rs_locks[i],
1064                                          oldrep->rs_modes[i], 0);
1065                 oldrep->rs_nlocks = 0;
1066
1067                 DEBUG_REQ(D_HA, req, "stole locks for");
1068                 spin_lock(&oldrep->rs_lock);
1069                 ptlrpc_schedule_difficult_reply (oldrep);
1070                 spin_unlock(&oldrep->rs_lock);
1071
1072                 spin_unlock (&svc->srv_lock);
1073                 break;
1074         }
1075         spin_unlock(&exp->exp_lock);
1076 }
1077
1078 /**
1079  * VBR: restore versions
1080  */
1081 void mdt_vbr_reconstruct(struct ptlrpc_request *req,
1082                          struct lsd_client_data *lcd)
1083 {
1084         __u64 pre_versions[4] = {0};
1085         pre_versions[0] = lcd->lcd_pre_versions[0];
1086         pre_versions[1] = lcd->lcd_pre_versions[1];
1087         pre_versions[2] = lcd->lcd_pre_versions[2];
1088         pre_versions[3] = lcd->lcd_pre_versions[3];
1089         lustre_msg_set_versions(req->rq_repmsg, pre_versions);
1090 }
1091
1092 void mdt_req_from_lcd(struct ptlrpc_request *req,
1093                       struct lsd_client_data *lcd)
1094 {
1095         DEBUG_REQ(D_HA, req, "restoring transno "LPD64"/status %d",
1096                   lcd->lcd_last_transno, lcd->lcd_last_result);
1097
1098         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
1099             lustre_msg_get_opc(req->rq_repmsg) == MDS_DONE_WRITING) {
1100                 req->rq_transno = lcd->lcd_last_close_transno;
1101                 req->rq_status = lcd->lcd_last_close_result;
1102         } else {
1103                 req->rq_transno = lcd->lcd_last_transno;
1104                 req->rq_status = lcd->lcd_last_result;
1105                 mdt_vbr_reconstruct(req, lcd);
1106         }
1107         if (req->rq_status != 0)
1108                 req->rq_transno = 0;
1109         lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
1110         lustre_msg_set_status(req->rq_repmsg, req->rq_status);
1111         DEBUG_REQ(D_RPCTRACE, req, "restoring transno "LPD64"/status %d",
1112                   req->rq_transno, req->rq_status);
1113
1114         mdt_steal_ack_locks(req);
1115 }
1116
1117 void mdt_reconstruct_generic(struct mdt_thread_info *mti,
1118                              struct mdt_lock_handle *lhc)
1119 {
1120         struct ptlrpc_request *req = mdt_info_req(mti);
1121         struct mdt_export_data *med = &req->rq_export->exp_mdt_data;
1122
1123         return mdt_req_from_lcd(req, med->med_lcd);
1124 }
1125
1126 static void mdt_reconstruct_create(struct mdt_thread_info *mti,
1127                                    struct mdt_lock_handle *lhc)
1128 {
1129         struct ptlrpc_request  *req = mdt_info_req(mti);
1130         struct obd_export *exp = req->rq_export;
1131         struct mdt_export_data *med = &exp->exp_mdt_data;
1132         struct mdt_device *mdt = mti->mti_mdt;
1133         struct mdt_object *child;
1134         struct mdt_body *body;
1135         int rc;
1136
1137         mdt_req_from_lcd(req, med->med_lcd);
1138         if (req->rq_status)
1139                 return;
1140
1141         /* if no error, so child was created with requested fid */
1142         child = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid2);
1143         if (IS_ERR(child)) {
1144                 rc = PTR_ERR(child);
1145                 LCONSOLE_WARN("Child "DFID" lookup error %d."
1146                               " Evicting client %s with export %s.\n",
1147                               PFID(mdt_object_fid(child)), rc,
1148                               obd_uuid2str(&exp->exp_client_uuid),
1149                               obd_export_nid2str(exp));
1150                 mdt_export_evict(exp);
1151                 EXIT;
1152                 return;
1153         }
1154
1155         body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1156         mti->mti_attr.ma_need = MA_INODE;
1157         mti->mti_attr.ma_valid = 0;
1158         rc = mo_attr_get(mti->mti_env, mdt_object_child(child), &mti->mti_attr);
1159         if (rc == -EREMOTE) {
1160                 /* object was created on remote server */
1161                 req->rq_status = rc;
1162                 body->valid |= OBD_MD_MDS;
1163         }
1164         mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
1165                            mdt_object_fid(child));
1166         mdt_object_put(mti->mti_env, child);
1167 }
1168
1169 static void mdt_reconstruct_setattr(struct mdt_thread_info *mti,
1170                                     struct mdt_lock_handle *lhc)
1171 {
1172         struct ptlrpc_request  *req = mdt_info_req(mti);
1173         struct obd_export *exp = req->rq_export;
1174         struct mdt_export_data *med = &exp->exp_mdt_data;
1175         struct mdt_device *mdt = mti->mti_mdt;
1176         struct mdt_object *obj;
1177         struct mdt_body *body;
1178
1179         mdt_req_from_lcd(req, med->med_lcd);
1180         if (req->rq_status)
1181                 return;
1182
1183         body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1184         obj = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid1);
1185         if (IS_ERR(obj)) {
1186                 int rc = PTR_ERR(obj);
1187                 LCONSOLE_WARN(""DFID" lookup error %d."
1188                               " Evicting client %s with export %s.\n",
1189                               PFID(mdt_object_fid(obj)), rc,
1190                               obd_uuid2str(&exp->exp_client_uuid),
1191                               obd_export_nid2str(exp));
1192                 mdt_export_evict(exp);
1193                 EXIT;
1194                 return;
1195         }
1196         mti->mti_attr.ma_need = MA_INODE;
1197         mti->mti_attr.ma_valid = 0;
1198         mo_attr_get(mti->mti_env, mdt_object_child(obj), &mti->mti_attr);
1199         mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
1200                            mdt_object_fid(obj));
1201         if (mti->mti_epoch && (mti->mti_epoch->flags & MF_EPOCH_OPEN)) {
1202                 struct mdt_file_data *mfd;
1203                 struct mdt_body *repbody;
1204
1205                 repbody = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1206                 repbody->ioepoch = obj->mot_ioepoch;
1207                 spin_lock(&med->med_open_lock);
1208                 list_for_each_entry(mfd, &med->med_open_head, mfd_list) {
1209                         if (mfd->mfd_xid == req->rq_xid)
1210                                 break;
1211                 }
1212                 LASSERT(&mfd->mfd_list != &med->med_open_head);
1213                 spin_unlock(&med->med_open_lock);
1214                 repbody->handle.cookie = mfd->mfd_handle.h_cookie;
1215         }
1216
1217         mdt_object_put(mti->mti_env, obj);
1218 }
1219
1220 typedef void (*mdt_reconstructor)(struct mdt_thread_info *mti,
1221                                   struct mdt_lock_handle *lhc);
1222
1223 static mdt_reconstructor reconstructors[REINT_MAX] = {
1224         [REINT_SETATTR]  = mdt_reconstruct_setattr,
1225         [REINT_CREATE]   = mdt_reconstruct_create,
1226         [REINT_LINK]     = mdt_reconstruct_generic,
1227         [REINT_UNLINK]   = mdt_reconstruct_generic,
1228         [REINT_RENAME]   = mdt_reconstruct_generic,
1229         [REINT_OPEN]     = mdt_reconstruct_open,
1230         [REINT_SETXATTR] = mdt_reconstruct_generic
1231 };
1232
1233 void mdt_reconstruct(struct mdt_thread_info *mti,
1234                      struct mdt_lock_handle *lhc)
1235 {
1236         ENTRY;
1237         reconstructors[mti->mti_rr.rr_opcode](mti, lhc);
1238         EXIT;
1239 }