lustre/mdt/mdt_recovery.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Whamcloud, Inc.
  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 #define DEBUG_SUBSYSTEM S_MDS
  45
  46 #include "mdt_internal.h"
  47
  48 struct lu_buf *mdt_buf(const struct lu_env *env, void *area, ssize_t len)
  49 {
  50         struct lu_buf *buf;
  51         struct mdt_thread_info *mti;
  52
  53         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
  54         buf = &mti->mti_buf;
  55         buf->lb_buf = area;
  56         buf->lb_len = len;
  57         return buf;
  58 }
  59
  60 const struct lu_buf *mdt_buf_const(const struct lu_env *env,
  61                                    const void *area, ssize_t len)
  62 {
  63         struct lu_buf *buf;
  64         struct mdt_thread_info *mti;
  65
  66         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
  67         buf = &mti->mti_buf;
  68
  69         buf->lb_buf = (void *)area;
  70         buf->lb_len = len;
  71         return buf;
  72 }
  73
  74 void mdt_trans_stop(const struct lu_env *env,
  75                     struct mdt_device *mdt, struct thandle *th)
  76 {
  77         dt_trans_stop(env, mdt->mdt_bottom, th);
  78 }
  79
  80 static int mdt_clients_data_init(const struct lu_env *env,
  81                                  struct mdt_device *mdt,
  82                                  unsigned long last_size)
  83 {
  84         struct lr_server_data  *lsd = &mdt->mdt_lut.lut_lsd;
  85         struct lsd_client_data *lcd;
  86         struct obd_device      *obd = mdt2obd_dev(mdt);
  87         loff_t off;
  88         int cl_idx;
  89         int rc = 0;
  90         ENTRY;
  91
  92         OBD_ALLOC_PTR(lcd);
  93         if (!lcd)
  94                 RETURN(-ENOMEM);
  95
  96         /* When we do a clean MDS shutdown, we save the last_transno into
  97          * the header.  If we find clients with higher last_transno values
  98          * then those clients may need recovery done. */
  99         LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients) == 0);
 100         for (cl_idx = 0, off = lsd->lsd_client_start;
 101              off < last_size; cl_idx++) {
 102                 __u64 last_transno;
 103                 struct obd_export *exp;
 104                 struct mdt_thread_info *mti;
 105
 106                 off = lsd->lsd_client_start +
 107                         cl_idx * lsd->lsd_client_size;
 108
 109                 rc = tgt_client_data_read(env, &mdt->mdt_lut, lcd, &off, cl_idx);
 110                 if (rc) {
 111                         CERROR("error reading MDS %s idx %d, off %llu: rc %d\n",
 112                                LAST_RCVD, cl_idx, off, rc);
 113                         rc = 0;
 114                         break; /* read error shouldn't cause startup to fail */
 115                 }
 116
 117                 if (lcd->lcd_uuid[0] == '\0') {
 118                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
 119                                cl_idx);
 120                         continue;
 121                 }
 122
 123                 last_transno = lcd_last_transno(lcd);
 124
 125                 /* These exports are cleaned up by mdt_obd_disconnect(), so
 126                  * they need to be set up like real exports as
 127                  * mdt_obd_connect() does.
 128                  */
 129                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
 130                        " srv lr: "LPU64" lx: "LPU64"\n", lcd->lcd_uuid, cl_idx,
 131                        last_transno, lsd->lsd_last_transno,
 132                        lcd_last_xid(lcd));
 133
 134                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
 135                 if (IS_ERR(exp)) {
 136                         if (PTR_ERR(exp) == -EALREADY) {
 137                                 /* export already exists, zero out this one */
 138                                 CERROR("Duplicate export %s!\n", lcd->lcd_uuid);
 139                                 continue;
 140                         }
 141                         GOTO(err_client, rc = PTR_ERR(exp));
 142                 }
 143
 144                 mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 145                 LASSERT(mti != NULL);
 146                 mti->mti_exp = exp;
 147                 /* copy on-disk lcd to the export */
 148                 *exp->exp_target_data.ted_lcd = *lcd;
 149                 rc = tgt_client_add(env, exp, cl_idx);
 150                 /* can't fail existing */
 151                 LASSERTF(rc == 0, "rc = %d\n", rc);
 152                 /* VBR: set export last committed version */
 153                 exp->exp_last_committed = last_transno;
 154                 cfs_spin_lock(&exp->exp_lock);
 155                 exp->exp_connecting = 0;
 156                 exp->exp_in_recovery = 0;
 157                 cfs_spin_unlock(&exp->exp_lock);
 158                 obd->obd_max_recoverable_clients++;
 159                 class_export_put(exp);
 160
 161                 CDEBUG(D_OTHER, "client at idx %d has last_transno="LPU64"\n",
 162                        cl_idx, last_transno);
 163                 /* protect __u64 value update */
 164                 cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 165                 mdt->mdt_lut.lut_last_transno = max(last_transno,
 166                                                 mdt->mdt_lut.lut_last_transno);
 167                 cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 168         }
 169
 170 err_client:
 171         OBD_FREE_PTR(lcd);
 172         RETURN(rc);
 173 }
 174
 175 static int mdt_server_data_init(const struct lu_env *env,
 176                                 struct mdt_device *mdt,
 177                                 struct lustre_sb_info *lsi)
 178 {
 179         struct lr_server_data  *lsd = &mdt->mdt_lut.lut_lsd;
 180         struct lsd_client_data *lcd = NULL;
 181         struct obd_device      *obd = mdt2obd_dev(mdt);
 182         struct mdt_thread_info *mti;
 183         struct dt_object       *obj;
 184         struct lu_attr         *la;
 185         unsigned long last_rcvd_size;
 186         __u64 mount_count;
 187         int rc;
 188         ENTRY;
 189
 190         /* ensure padding in the struct is the correct size */
 191         CLASSERT(offsetof(struct lr_server_data, lsd_padding) +
 192                 sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
 193         CLASSERT(offsetof(struct lsd_client_data, lcd_padding) +
 194                 sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
 195
 196         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 197         LASSERT(mti != NULL);
 198         la = &mti->mti_attr.ma_attr;
 199
 200         obj = mdt->mdt_lut.lut_last_rcvd;
 201         rc = dt_attr_get(env, obj, la, BYPASS_CAPA);
 202         if (rc)
 203                 RETURN(rc);
 204
 205         last_rcvd_size = (unsigned long)la->la_size;
 206
 207         if (last_rcvd_size == 0) {
 208                 LCONSOLE_WARN("%s: new disk, initializing\n", obd->obd_name);
 209
 210                 memcpy(lsd->lsd_uuid, obd->obd_uuid.uuid,
 211                        sizeof(lsd->lsd_uuid));
 212                 lsd->lsd_last_transno = 0;
 213                 lsd->lsd_mount_count = 0;
 214                 lsd->lsd_server_size = LR_SERVER_SIZE;
 215                 lsd->lsd_client_start = LR_CLIENT_START;
 216                 lsd->lsd_client_size = LR_CLIENT_SIZE;
 217                 lsd->lsd_feature_compat = OBD_COMPAT_MDT;
 218                 lsd->lsd_feature_rocompat = OBD_ROCOMPAT_LOVOBJID;
 219                 lsd->lsd_feature_incompat = OBD_INCOMPAT_MDT |
 220                                             OBD_INCOMPAT_COMMON_LR |
 221                                             OBD_INCOMPAT_MULTI_OI;
 222         } else {
 223                 LCONSOLE_WARN("%s: used disk, loading\n", obd->obd_name);
 224                 rc = tgt_server_data_read(env, &mdt->mdt_lut);
 225                 if (rc) {
 226                         CERROR("error reading MDS %s: rc %d\n", LAST_RCVD, rc);
 227                         GOTO(out, rc);
 228                 }
 229                 if (strcmp(lsd->lsd_uuid, obd->obd_uuid.uuid) != 0) {
 230                         LCONSOLE_ERROR_MSG(0x157, "Trying to start OBD %s using"
 231                                            "the wrong disk %s. Were the /dev/ "
 232                                            "assignments rearranged?\n",
 233                                            obd->obd_uuid.uuid, lsd->lsd_uuid);
 234                         GOTO(out, rc = -EINVAL);
 235                 }
 236                 lsd->lsd_feature_compat |= OBD_COMPAT_MDT;
 237                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_MDT |
 238                                              OBD_INCOMPAT_COMMON_LR;
 239         }
 240         mount_count = lsd->lsd_mount_count;
 241
 242         if (lsd->lsd_feature_incompat & ~MDT_INCOMPAT_SUPP) {
 243                 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
 244                        obd->obd_name,
 245                        lsd->lsd_feature_incompat & ~MDT_INCOMPAT_SUPP);
 246                 GOTO(out, rc = -EINVAL);
 247         }
 248         if (lsd->lsd_feature_rocompat & ~MDT_ROCOMPAT_SUPP) {
 249                 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
 250                        obd->obd_name,
 251                        lsd->lsd_feature_rocompat & ~MDT_ROCOMPAT_SUPP);
 252                 /* XXX: Do something like remount filesystem read-only */
 253                 GOTO(out, rc = -EINVAL);
 254         }
 255         /** Interop: evict all clients at first boot with 1.8 last_rcvd */
 256         if (!(lsd->lsd_feature_compat & OBD_COMPAT_20)) {
 257                 if (last_rcvd_size > lsd->lsd_client_start) {
 258                         LCONSOLE_WARN("Mounting %s at first time on 1.8 FS, "
 259                                       "remove all clients for interop needs\n",
 260                                       obd->obd_name);
 261                         rc = tgt_truncate_last_rcvd(env, &mdt->mdt_lut,
 262                                                     lsd->lsd_client_start);
 263                         if (rc)
 264                                 GOTO(out, rc);
 265                         last_rcvd_size = lsd->lsd_client_start;
 266                 }
 267                 /** set 2.0 flag to upgrade/downgrade between 1.8 and 2.0 */
 268                 lsd->lsd_feature_compat |= OBD_COMPAT_20;
 269         }
 270
 271         lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
 272
 273         cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 274         mdt->mdt_lut.lut_last_transno = lsd->lsd_last_transno;
 275         cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 276
 277         CDEBUG(D_INODE, "========BEGIN DUMPING LAST_RCVD========\n");
 278         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
 279                obd->obd_name, mdt->mdt_lut.lut_last_transno);
 280         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
 281                obd->obd_name, mount_count + 1);
 282         CDEBUG(D_INODE, "%s: server data size: %u\n",
 283                obd->obd_name, lsd->lsd_server_size);
 284         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
 285                obd->obd_name, lsd->lsd_client_start);
 286         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
 287                obd->obd_name, lsd->lsd_client_size);
 288         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
 289                obd->obd_name, last_rcvd_size);
 290         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", obd->obd_name,
 291                last_rcvd_size <= lsd->lsd_client_start ? 0 :
 292                (last_rcvd_size - lsd->lsd_client_start) /
 293                 lsd->lsd_client_size);
 294         CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
 295
 296         if (!lsd->lsd_server_size || !lsd->lsd_client_start ||
 297             !lsd->lsd_client_size) {
 298                 CERROR("Bad last_rcvd contents!\n");
 299                 GOTO(out, rc = -EINVAL);
 300         }
 301
 302         rc = mdt_clients_data_init(env, mdt, last_rcvd_size);
 303         if (rc)
 304                 GOTO(err_client, rc);
 305
 306         cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 307         /* obd_last_committed is used for compatibility
 308          * with other lustre recovery code */
 309         obd->obd_last_committed = mdt->mdt_lut.lut_last_transno;
 310         cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 311
 312         obd->u.obt.obt_mount_count = mount_count + 1;
 313         obd->u.obt.obt_instance = (__u32)obd->u.obt.obt_mount_count;
 314         lsd->lsd_mount_count = obd->u.obt.obt_mount_count;
 315
 316         /* save it, so mount count and last_transno is current */
 317         rc = tgt_server_data_update(env, &mdt->mdt_lut, 0);
 318         if (rc)
 319                 GOTO(err_client, rc);
 320
 321         RETURN(0);
 322
 323 err_client:
 324         class_disconnect_exports(obd);
 325 out:
 326         return rc;
 327 }
 328
 329 /*
 330  * last_rcvd & last_committed update callbacks
 331  */
 332 static int mdt_last_rcvd_update(struct mdt_thread_info *mti,
 333                                 struct thandle *th)
 334 {
 335         struct mdt_device *mdt = mti->mti_mdt;
 336         struct ptlrpc_request *req = mdt_info_req(mti);
 337         struct tg_export_data *ted;
 338         struct lsd_client_data *lcd;
 339         loff_t off;
 340         int err;
 341         __s32 rc = th->th_result;
 342
 343         ENTRY;
 344         LASSERT(req);
 345         LASSERT(req->rq_export);
 346         LASSERT(mdt);
 347         ted = &req->rq_export->exp_target_data;
 348         LASSERT(ted);
 349
 350         cfs_mutex_lock(&ted->ted_lcd_lock);
 351         lcd = ted->ted_lcd;
 352         /* if the export has already been disconnected, we have no last_rcvd slot,
 353          * update server data with latest transno then */
 354         if (lcd == NULL) {
 355                 cfs_mutex_unlock(&ted->ted_lcd_lock);
 356                 CWARN("commit transaction for disconnected client %s: rc %d\n",
 357                       req->rq_export->exp_client_uuid.uuid, rc);
 358                 err = tgt_server_data_write(mti->mti_env, &mdt->mdt_lut, th);
 359                 RETURN(err);
 360         }
 361
 362         off = ted->ted_lr_off;
 363         LASSERT(ergo(mti->mti_transno == 0, rc != 0));
 364         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
 365             lustre_msg_get_opc(req->rq_reqmsg) == MDS_DONE_WRITING) {
 366                 if (mti->mti_transno != 0) {
 367                         if (lcd->lcd_last_close_transno > mti->mti_transno) {
 368                                 CERROR("Trying to overwrite bigger transno:"
 369                                        "on-disk: "LPU64", new: "LPU64" "
 370                                        "replay: %d. see LU-617.\n",
 371                                        lcd->lcd_last_close_transno,
 372                                        mti->mti_transno, req_is_replay(req));
 373                                 if (req_is_replay(req)) {
 374                                         cfs_spin_lock(&req->rq_export->exp_lock);
 375                                         req->rq_export->exp_vbr_failed = 1;
 376                                         cfs_spin_unlock(&req->rq_export->exp_lock);
 377                                 }
 378                                 cfs_mutex_unlock(&ted->ted_lcd_lock);
 379                                 RETURN(req_is_replay(req) ? -EOVERFLOW : 0);
 380                         }
 381                         lcd->lcd_last_close_transno = mti->mti_transno;
 382                 }
 383                 lcd->lcd_last_close_xid = req->rq_xid;
 384                 lcd->lcd_last_close_result = rc;
 385         } else {
 386                 /* VBR: save versions in last_rcvd for reconstruct. */
 387                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
 388                 if (pre_versions) {
 389                         lcd->lcd_pre_versions[0] = pre_versions[0];
 390                         lcd->lcd_pre_versions[1] = pre_versions[1];
 391                         lcd->lcd_pre_versions[2] = pre_versions[2];
 392                         lcd->lcd_pre_versions[3] = pre_versions[3];
 393                 }
 394                 if (mti->mti_transno != 0) {
 395                         if (lcd->lcd_last_transno > mti->mti_transno) {
 396                                 CERROR("Trying to overwrite bigger transno:"
 397                                        "on-disk: "LPU64", new: "LPU64" "
 398                                        "replay: %d. see LU-617.\n",
 399                                        lcd->lcd_last_transno,
 400                                        mti->mti_transno, req_is_replay(req));
 401                                 if (req_is_replay(req)) {
 402                                         cfs_spin_lock(&req->rq_export->exp_lock);
 403                                         req->rq_export->exp_vbr_failed = 1;
 404                                         cfs_spin_unlock(&req->rq_export->exp_lock);
 405                                 }
 406                                 cfs_mutex_unlock(&ted->ted_lcd_lock);
 407                                 RETURN(req_is_replay(req) ? -EOVERFLOW : 0);
 408                         }
 409                         lcd->lcd_last_transno = mti->mti_transno;
 410                 }
 411                 lcd->lcd_last_xid = req->rq_xid;
 412                 lcd->lcd_last_result = rc;
 413                 /*XXX: save intent_disposition in mdt_thread_info?
 414                  * also there is bug - intent_dispostion is __u64,
 415                  * see struct ldlm_reply->lock_policy_res1; */
 416                 lcd->lcd_last_data = mti->mti_opdata;
 417         }
 418
 419         if ((mti->mti_exp->exp_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0) {
 420                 /* Although lightweight (LW) connections have no slot in
 421                  * last_rcvd, we still want to maintain the in-memory
 422                  * lsd_client_data structure in order to properly handle reply
 423                  * reconstruction. */
 424                 struct lu_target        *tg = &mdt->mdt_lut;
 425                 bool                     update = false;
 426
 427                 cfs_mutex_unlock(&ted->ted_lcd_lock);
 428                 err = 0;
 429
 430                 /* All operations performed by LW clients are synchronous and
 431                  * we store the committed transno in the last_rcvd header */
 432                 cfs_spin_lock(&tg->lut_translock);
 433                 if (mti->mti_transno > tg->lut_lsd.lsd_last_transno) {
 434                         tg->lut_lsd.lsd_last_transno = mti->mti_transno;
 435                         update = true;
 436                 }
 437                 cfs_spin_unlock(&tg->lut_translock);
 438
 439                 if (update)
 440                         err = tgt_server_data_write(mti->mti_env, tg, th);
 441         } else if (off <= 0) {
 442                 CERROR("%s: client idx %d has offset %lld\n",
 443                        mdt2obd_dev(mdt)->obd_name, ted->ted_lr_idx, off);
 444                 cfs_mutex_unlock(&ted->ted_lcd_lock);
 445                 err = -EINVAL;
 446         } else {
 447                 err = tgt_client_data_write(mti->mti_env, &mdt->mdt_lut, lcd,
 448                                             &off, th);
 449                 cfs_mutex_unlock(&ted->ted_lcd_lock);
 450         }
 451         RETURN(err);
 452 }
 453
 454 extern struct lu_context_key mdt_thread_key;
 455
 456 /* add credits for last_rcvd update */
 457 static int mdt_txn_start_cb(const struct lu_env *env,
 458                             struct thandle *th, void *cookie)
 459 {
 460         struct mdt_device *mdt = cookie;
 461         struct mdt_thread_info *mti;
 462         int rc;
 463         ENTRY;
 464
 465         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 466
 467         LASSERT(mdt->mdt_lut.lut_last_rcvd);
 468         if (mti->mti_exp == NULL)
 469                 RETURN(0);
 470
 471         rc = dt_declare_record_write(env, mdt->mdt_lut.lut_last_rcvd,
 472                                      sizeof(struct lsd_client_data),
 473                                      mti->mti_exp->exp_target_data.ted_lr_off,
 474                                      th);
 475         if (rc)
 476                 return rc;
 477
 478         rc = dt_declare_record_write(env, mdt->mdt_lut.lut_last_rcvd,
 479                                      sizeof(struct lr_server_data), 0, th);
 480         if (rc)
 481                 return rc;
 482
 483         if (mti->mti_mos != NULL)
 484                 rc = dt_declare_version_set(env, mdt_obj2dt(mti->mti_mos), th);
 485
 486         return rc;
 487 }
 488
 489 /* Update last_rcvd records with latests transaction data */
 490 static int mdt_txn_stop_cb(const struct lu_env *env,
 491                            struct thandle *txn, void *cookie)
 492 {
 493         struct mdt_device *mdt = cookie;
 494         struct mdt_thread_info *mti;
 495         struct ptlrpc_request *req;
 496
 497         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 498         req = mdt_info_req(mti);
 499
 500         if (mti->mti_mdt == NULL || req == NULL)
 501                 return 0;
 502
 503         if (mti->mti_has_trans) {
 504                 /* XXX: currently there are allowed cases, but the wrong cases
 505                  * are also possible, so better check is needed here */
 506                 CDEBUG(D_INFO, "More than one transaction "LPU64"\n",
 507                        mti->mti_transno);
 508                 return 0;
 509         }
 510
 511         mti->mti_has_trans = 1;
 512         cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 513         if (txn->th_result != 0) {
 514                 if (mti->mti_transno != 0) {
 515                         CERROR("Replay transno "LPU64" failed: rc %d\n",
 516                                 mti->mti_transno, txn->th_result);
 517                         return 0;
 518                 }
 519         } else if (mti->mti_transno == 0) {
 520                 mti->mti_transno = ++ mdt->mdt_lut.lut_last_transno;
 521         } else {
 522                 /* should be replay */
 523                 if (mti->mti_transno > mdt->mdt_lut.lut_last_transno)
 524                         mdt->mdt_lut.lut_last_transno = mti->mti_transno;
 525         }
 526         cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 527         /* sometimes the reply message has not been successfully packed */
 528         LASSERT(req != NULL && req->rq_repmsg != NULL);
 529
 530         /** VBR: set new versions */
 531         if (txn->th_result == 0 && mti->mti_mos != NULL) {
 532                 dt_version_set(env, mdt_obj2dt(mti->mti_mos),
 533                                mti->mti_transno, txn);
 534                 mti->mti_mos = NULL;
 535         }
 536
 537         /* filling reply data */
 538         CDEBUG(D_INODE, "transno = "LPU64", last_committed = "LPU64"\n",
 539                mti->mti_transno, req->rq_export->exp_obd->obd_last_committed);
 540
 541         req->rq_transno = mti->mti_transno;
 542         lustre_msg_set_transno(req->rq_repmsg, mti->mti_transno);
 543         /* if can't add callback, do sync write */
 544         txn->th_sync |= !!tgt_last_commit_cb_add(txn, &mdt->mdt_lut,
 545                                                  mti->mti_exp,
 546                                                  mti->mti_transno);
 547         return mdt_last_rcvd_update(mti, txn);
 548 }
 549
 550 int mdt_fs_setup(const struct lu_env *env, struct mdt_device *mdt,
 551                  struct obd_device *obd,
 552                  struct lustre_sb_info *lsi)
 553 {
 554         int rc = 0;
 555         ENTRY;
 556
 557         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_FS_SETUP))
 558                 RETURN(-ENOENT);
 559
 560         /* prepare transactions callbacks */
 561         mdt->mdt_txn_cb.dtc_txn_start = mdt_txn_start_cb;
 562         mdt->mdt_txn_cb.dtc_txn_stop = mdt_txn_stop_cb;
 563         mdt->mdt_txn_cb.dtc_txn_commit = NULL;
 564         mdt->mdt_txn_cb.dtc_cookie = mdt;
 565         mdt->mdt_txn_cb.dtc_tag = LCT_MD_THREAD;
 566         CFS_INIT_LIST_HEAD(&mdt->mdt_txn_cb.dtc_linkage);
 567
 568         dt_txn_callback_add(mdt->mdt_bottom, &mdt->mdt_txn_cb);
 569
 570         rc = mdt_server_data_init(env, mdt, lsi);
 571
 572         RETURN(rc);
 573 }
 574
 575 void mdt_fs_cleanup(const struct lu_env *env, struct mdt_device *mdt)
 576 {
 577         ENTRY;
 578
 579         /* Remove transaction callback */
 580         dt_txn_callback_del(mdt->mdt_bottom, &mdt->mdt_txn_cb);
 581         if (mdt->mdt_ck_obj)
 582                 lu_object_put(env, &mdt->mdt_ck_obj->do_lu);
 583         mdt->mdt_ck_obj = NULL;
 584         EXIT;
 585 }
 586
 587 /* reconstruction code */
 588 static void mdt_steal_ack_locks(struct ptlrpc_request *req)
 589 {
 590         struct ptlrpc_service_part *svcpt;
 591         struct obd_export         *exp = req->rq_export;
 592         cfs_list_t                *tmp;
 593         struct ptlrpc_reply_state *oldrep;
 594         int                        i;
 595
 596         /* CAVEAT EMPTOR: spinlock order */
 597         cfs_spin_lock(&exp->exp_lock);
 598         cfs_list_for_each (tmp, &exp->exp_outstanding_replies) {
 599                 oldrep = cfs_list_entry(tmp, struct ptlrpc_reply_state,
 600                                         rs_exp_list);
 601
 602                 if (oldrep->rs_xid != req->rq_xid)
 603                         continue;
 604
 605                 if (oldrep->rs_opc != lustre_msg_get_opc(req->rq_reqmsg))
 606                         CERROR ("Resent req xid "LPU64" has mismatched opc: "
 607                                 "new %d old %d\n", req->rq_xid,
 608                                 lustre_msg_get_opc(req->rq_reqmsg),
 609                                 oldrep->rs_opc);
 610
 611                 svcpt = oldrep->rs_svcpt;
 612                 cfs_spin_lock(&svcpt->scp_rep_lock);
 613
 614                 cfs_list_del_init (&oldrep->rs_exp_list);
 615
 616                 CDEBUG(D_HA, "Stealing %d locks from rs %p x"LPD64".t"LPD64
 617                        " o%d NID %s\n",
 618                        oldrep->rs_nlocks, oldrep,
 619                        oldrep->rs_xid, oldrep->rs_transno, oldrep->rs_opc,
 620                        libcfs_nid2str(exp->exp_connection->c_peer.nid));
 621
 622                 for (i = 0; i < oldrep->rs_nlocks; i++)
 623                         ptlrpc_save_lock(req, &oldrep->rs_locks[i],
 624                                          oldrep->rs_modes[i], 0);
 625                 oldrep->rs_nlocks = 0;
 626
 627                 DEBUG_REQ(D_HA, req, "stole locks for");
 628                 cfs_spin_lock(&oldrep->rs_lock);
 629                 ptlrpc_schedule_difficult_reply (oldrep);
 630                 cfs_spin_unlock(&oldrep->rs_lock);
 631
 632                 cfs_spin_unlock(&svcpt->scp_rep_lock);
 633                 break;
 634         }
 635         cfs_spin_unlock(&exp->exp_lock);
 636 }
 637
 638 /**
 639  * VBR: restore versions
 640  */
 641 void mdt_vbr_reconstruct(struct ptlrpc_request *req,
 642                          struct lsd_client_data *lcd)
 643 {
 644         __u64 pre_versions[4] = {0};
 645         pre_versions[0] = lcd->lcd_pre_versions[0];
 646         pre_versions[1] = lcd->lcd_pre_versions[1];
 647         pre_versions[2] = lcd->lcd_pre_versions[2];
 648         pre_versions[3] = lcd->lcd_pre_versions[3];
 649         lustre_msg_set_versions(req->rq_repmsg, pre_versions);
 650 }
 651
 652 void mdt_req_from_lcd(struct ptlrpc_request *req,
 653                       struct lsd_client_data *lcd)
 654 {
 655         DEBUG_REQ(D_HA, req, "restoring transno "LPD64"/status %d",
 656                   lcd->lcd_last_transno, lcd->lcd_last_result);
 657
 658         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
 659             lustre_msg_get_opc(req->rq_repmsg) == MDS_DONE_WRITING) {
 660                 req->rq_transno = lcd->lcd_last_close_transno;
 661                 req->rq_status = lcd->lcd_last_close_result;
 662         } else {
 663                 req->rq_transno = lcd->lcd_last_transno;
 664                 req->rq_status = lcd->lcd_last_result;
 665                 mdt_vbr_reconstruct(req, lcd);
 666         }
 667         if (req->rq_status != 0)
 668                 req->rq_transno = 0;
 669         lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
 670         lustre_msg_set_status(req->rq_repmsg, req->rq_status);
 671         DEBUG_REQ(D_RPCTRACE, req, "restoring transno "LPD64"/status %d",
 672                   req->rq_transno, req->rq_status);
 673
 674         mdt_steal_ack_locks(req);
 675 }
 676
 677 void mdt_reconstruct_generic(struct mdt_thread_info *mti,
 678                              struct mdt_lock_handle *lhc)
 679 {
 680         struct ptlrpc_request *req = mdt_info_req(mti);
 681         struct tg_export_data *ted = &req->rq_export->exp_target_data;
 682
 683         return mdt_req_from_lcd(req, ted->ted_lcd);
 684 }
 685
 686 static void mdt_reconstruct_create(struct mdt_thread_info *mti,
 687                                    struct mdt_lock_handle *lhc)
 688 {
 689         struct ptlrpc_request  *req = mdt_info_req(mti);
 690         struct obd_export *exp = req->rq_export;
 691         struct tg_export_data *ted = &exp->exp_target_data;
 692         struct mdt_device *mdt = mti->mti_mdt;
 693         struct mdt_object *child;
 694         struct mdt_body *body;
 695         int rc;
 696
 697         mdt_req_from_lcd(req, ted->ted_lcd);
 698         if (req->rq_status)
 699                 return;
 700
 701         /* if no error, so child was created with requested fid */
 702         child = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid2);
 703         if (IS_ERR(child)) {
 704                 rc = PTR_ERR(child);
 705                 LCONSOLE_WARN("Child "DFID" lookup error %d."
 706                               " Evicting client %s with export %s.\n",
 707                               PFID(mdt_object_fid(child)), rc,
 708                               obd_uuid2str(&exp->exp_client_uuid),
 709                               obd_export_nid2str(exp));
 710                 mdt_export_evict(exp);
 711                 EXIT;
 712                 return;
 713         }
 714
 715         body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
 716         mti->mti_attr.ma_need = MA_INODE;
 717         mti->mti_attr.ma_valid = 0;
 718         rc = mdt_attr_get_complex(mti, child, &mti->mti_attr);
 719         if (rc == -EREMOTE) {
 720                 /* object was created on remote server */
 721                 req->rq_status = rc;
 722                 body->valid |= OBD_MD_MDS;
 723         }
 724         mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
 725                            mdt_object_fid(child));
 726         mdt_object_put(mti->mti_env, child);
 727 }
 728
 729 static void mdt_reconstruct_setattr(struct mdt_thread_info *mti,
 730                                     struct mdt_lock_handle *lhc)
 731 {
 732         struct ptlrpc_request  *req = mdt_info_req(mti);
 733         struct obd_export *exp = req->rq_export;
 734         struct mdt_export_data *med = &exp->exp_mdt_data;
 735         struct mdt_device *mdt = mti->mti_mdt;
 736         struct mdt_object *obj;
 737         struct mdt_body *body;
 738
 739         mdt_req_from_lcd(req, med->med_ted.ted_lcd);
 740         if (req->rq_status)
 741                 return;
 742
 743         body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
 744         obj = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid1);
 745         if (IS_ERR(obj)) {
 746                 int rc = PTR_ERR(obj);
 747                 LCONSOLE_WARN(""DFID" lookup error %d."
 748                               " Evicting client %s with export %s.\n",
 749                               PFID(mdt_object_fid(obj)), rc,
 750                               obd_uuid2str(&exp->exp_client_uuid),
 751                               obd_export_nid2str(exp));
 752                 mdt_export_evict(exp);
 753                 EXIT;
 754                 return;
 755         }
 756         mti->mti_attr.ma_need = MA_INODE;
 757         mti->mti_attr.ma_valid = 0;
 758         mdt_attr_get_complex(mti, obj, &mti->mti_attr);
 759         mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
 760                            mdt_object_fid(obj));
 761         if (mti->mti_ioepoch && (mti->mti_ioepoch->flags & MF_EPOCH_OPEN)) {
 762                 struct mdt_file_data *mfd;
 763                 struct mdt_body *repbody;
 764
 765                 repbody = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
 766                 repbody->ioepoch = obj->mot_ioepoch;
 767                 cfs_spin_lock(&med->med_open_lock);
 768                 cfs_list_for_each_entry(mfd, &med->med_open_head, mfd_list) {
 769                         if (mfd->mfd_xid == req->rq_xid)
 770                                 break;
 771                 }
 772                 LASSERT(&mfd->mfd_list != &med->med_open_head);
 773                 cfs_spin_unlock(&med->med_open_lock);
 774                 repbody->handle.cookie = mfd->mfd_handle.h_cookie;
 775         }
 776
 777         mdt_object_put(mti->mti_env, obj);
 778 }
 779
 780 typedef void (*mdt_reconstructor)(struct mdt_thread_info *mti,
 781                                   struct mdt_lock_handle *lhc);
 782
 783 static mdt_reconstructor reconstructors[REINT_MAX] = {
 784         [REINT_SETATTR]  = mdt_reconstruct_setattr,
 785         [REINT_CREATE]   = mdt_reconstruct_create,
 786         [REINT_LINK]     = mdt_reconstruct_generic,
 787         [REINT_UNLINK]   = mdt_reconstruct_generic,
 788         [REINT_RENAME]   = mdt_reconstruct_generic,
 789         [REINT_OPEN]     = mdt_reconstruct_open,
 790         [REINT_SETXATTR] = mdt_reconstruct_generic
 791 };
 792
 793 void mdt_reconstruct(struct mdt_thread_info *mti,
 794                      struct mdt_lock_handle *lhc)
 795 {
 796         ENTRY;
 797         reconstructors[mti->mti_rr.rr_opcode](mti, lhc);
 798         EXIT;
 799 }