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 int mdt_record_read(const struct lu_env *env,
  82                     struct dt_object *dt, struct lu_buf *buf, loff_t *pos)
  83 {
  84         int rc;
  85
  86         LASSERTF(dt != NULL, "dt is NULL when we want to read record\n");
  87
  88         rc = dt->do_body_ops->dbo_read(env, dt, buf, pos, BYPASS_CAPA);
  89
  90         if (rc == buf->lb_len)
  91                 rc = 0;
  92         else if (rc >= 0)
  93                 rc = -EFAULT;
  94         return rc;
  95 }
  96
  97 int mdt_record_write(const struct lu_env *env,
  98                      struct dt_object *dt, const struct lu_buf *buf,
  99                      loff_t *pos, struct thandle *th)
 100 {
 101         int rc;
 102
 103         LASSERTF(dt != NULL, "dt is NULL when we want to write record\n");
 104         LASSERT(th != NULL);
 105         rc = dt->do_body_ops->dbo_write(env, dt, buf, pos, th, BYPASS_CAPA, 1);
 106         if (rc == buf->lb_len)
 107                 rc = 0;
 108         else if (rc >= 0)
 109                 rc = -EFAULT;
 110         return rc;
 111 }
 112
 113 static inline int mdt_trans_credit_get(const struct lu_env *env,
 114                                        struct mdt_device *mdt,
 115                                        enum mdt_txn_op op)
 116 {
 117         struct dt_device *dev = mdt->mdt_bottom;
 118         int cr;
 119         switch (op) {
 120                 case MDT_TXN_CAPA_KEYS_WRITE_OP:
 121                 case MDT_TXN_LAST_RCVD_WRITE_OP:
 122                         cr = dev->dd_ops->dt_credit_get(env,
 123                                                         dev,
 124                                                         DTO_WRITE_BLOCK);
 125                 break;
 126                 default:
 127                         LBUG();
 128         }
 129         return cr;
 130 }
 131
 132 void mdt_trans_credit_init(const struct lu_env *env,
 133                            struct mdt_device *mdt,
 134                            enum mdt_txn_op op)
 135 {
 136         struct mdt_thread_info *mti;
 137         struct txn_param *p;
 138         int cr;
 139
 140         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 141         p = &mti->mti_txn_param;
 142
 143         cr = mdt_trans_credit_get(env, mdt, op);
 144         txn_param_init(p, cr);
 145 }
 146
 147 struct thandle* mdt_trans_start(const struct lu_env *env,
 148                                 struct mdt_device *mdt)
 149 {
 150         struct mdt_thread_info *mti;
 151         struct txn_param *p;
 152
 153         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 154         p = &mti->mti_txn_param;
 155
 156         /* export can require sync operations */
 157         if (mti->mti_exp != NULL)
 158                 p->tp_sync = mti->mti_exp->exp_need_sync;
 159
 160         return mdt->mdt_bottom->dd_ops->dt_trans_start(env, mdt->mdt_bottom, p);
 161 }
 162
 163 void mdt_trans_stop(const struct lu_env *env,
 164                     struct mdt_device *mdt, struct thandle *th)
 165 {
 166         mdt->mdt_bottom->dd_ops->dt_trans_stop(env, th);
 167 }
 168
 169 /* last_rcvd handling */
 170 static inline void lsd_le_to_cpu(struct lr_server_data *buf,
 171                                  struct lr_server_data *lsd)
 172 {
 173         memcpy(lsd->lsd_uuid, buf->lsd_uuid, sizeof (lsd->lsd_uuid));
 174         lsd->lsd_last_transno     = le64_to_cpu(buf->lsd_last_transno);
 175         lsd->lsd_mount_count      = le64_to_cpu(buf->lsd_mount_count);
 176         lsd->lsd_feature_compat   = le32_to_cpu(buf->lsd_feature_compat);
 177         lsd->lsd_feature_rocompat = le32_to_cpu(buf->lsd_feature_rocompat);
 178         lsd->lsd_feature_incompat = le32_to_cpu(buf->lsd_feature_incompat);
 179         lsd->lsd_server_size      = le32_to_cpu(buf->lsd_server_size);
 180         lsd->lsd_client_start     = le32_to_cpu(buf->lsd_client_start);
 181         lsd->lsd_client_size      = le16_to_cpu(buf->lsd_client_size);
 182 }
 183
 184 static inline void lsd_cpu_to_le(struct lr_server_data *lsd,
 185                                  struct lr_server_data *buf)
 186 {
 187         memcpy(buf->lsd_uuid, lsd->lsd_uuid, sizeof (lsd->lsd_uuid));
 188         buf->lsd_last_transno     = cpu_to_le64(lsd->lsd_last_transno);
 189         buf->lsd_mount_count      = cpu_to_le64(lsd->lsd_mount_count);
 190         buf->lsd_feature_compat   = cpu_to_le32(lsd->lsd_feature_compat);
 191         buf->lsd_feature_rocompat = cpu_to_le32(lsd->lsd_feature_rocompat);
 192         buf->lsd_feature_incompat = cpu_to_le32(lsd->lsd_feature_incompat);
 193         buf->lsd_server_size      = cpu_to_le32(lsd->lsd_server_size);
 194         buf->lsd_client_start     = cpu_to_le32(lsd->lsd_client_start);
 195         buf->lsd_client_size      = cpu_to_le16(lsd->lsd_client_size);
 196 }
 197
 198 static inline void lcd_le_to_cpu(struct lsd_client_data *buf,
 199                                  struct lsd_client_data *lcd)
 200 {
 201         memcpy(lcd->lcd_uuid, buf->lcd_uuid, sizeof (lcd->lcd_uuid));
 202         lcd->lcd_last_transno       = le64_to_cpu(buf->lcd_last_transno);
 203         lcd->lcd_last_xid           = le64_to_cpu(buf->lcd_last_xid);
 204         lcd->lcd_last_result        = le32_to_cpu(buf->lcd_last_result);
 205         lcd->lcd_last_data          = le32_to_cpu(buf->lcd_last_data);
 206         lcd->lcd_last_close_transno = le64_to_cpu(buf->lcd_last_close_transno);
 207         lcd->lcd_last_close_xid     = le64_to_cpu(buf->lcd_last_close_xid);
 208         lcd->lcd_last_close_result  = le32_to_cpu(buf->lcd_last_close_result);
 209 }
 210
 211 static inline void lcd_cpu_to_le(struct lsd_client_data *lcd,
 212                                  struct lsd_client_data *buf)
 213 {
 214         memcpy(buf->lcd_uuid, lcd->lcd_uuid, sizeof (lcd->lcd_uuid));
 215         buf->lcd_last_transno       = cpu_to_le64(lcd->lcd_last_transno);
 216         buf->lcd_last_xid           = cpu_to_le64(lcd->lcd_last_xid);
 217         buf->lcd_last_result        = cpu_to_le32(lcd->lcd_last_result);
 218         buf->lcd_last_data          = cpu_to_le32(lcd->lcd_last_data);
 219         buf->lcd_last_close_transno = cpu_to_le64(lcd->lcd_last_close_transno);
 220         buf->lcd_last_close_xid     = cpu_to_le64(lcd->lcd_last_close_xid);
 221         buf->lcd_last_close_result  = cpu_to_le32(lcd->lcd_last_close_result);
 222 }
 223
 224 static inline int mdt_last_rcvd_header_read(const struct lu_env *env,
 225                                             struct mdt_device *mdt)
 226 {
 227         struct mdt_thread_info *mti;
 228         int rc;
 229
 230         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 231
 232         mti->mti_off = 0;
 233         rc = mdt_record_read(env, mdt->mdt_last_rcvd,
 234                              mdt_buf(env, &mti->mti_lsd, sizeof(mti->mti_lsd)),
 235                              &mti->mti_off);
 236         if (rc == 0)
 237                 lsd_le_to_cpu(&mti->mti_lsd, &mdt->mdt_lsd);
 238
 239         CDEBUG(D_INFO, "read last_rcvd header rc = %d:\n"
 240                        "uuid = %s\n"
 241                        "last_transno = "LPU64"\n",
 242                         rc, mdt->mdt_lsd.lsd_uuid,
 243                         mdt->mdt_lsd.lsd_last_transno);
 244         return rc;
 245 }
 246
 247 static void mdt_client_cb(const struct mdt_device *mdt, __u64 transno,
 248                           void *data, int err)
 249 {
 250         struct obd_device *obd = mdt2obd_dev(mdt);
 251         target_client_add_cb(obd, transno, data, err);
 252 }
 253
 254 static inline int mdt_last_rcvd_header_write(const struct lu_env *env,
 255                                              struct mdt_device *mdt,
 256                                              int need_sync)
 257 {
 258         struct mdt_thread_info *mti;
 259         struct thandle *th;
 260         int rc;
 261         ENTRY;
 262
 263         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 264
 265         if (mti->mti_exp) {
 266                 spin_lock(&mti->mti_exp->exp_lock);
 267                 mti->mti_exp->exp_need_sync = need_sync;
 268                 spin_unlock(&mti->mti_exp->exp_lock);
 269         }
 270         mdt_trans_credit_init(env, mdt, MDT_TXN_LAST_RCVD_WRITE_OP);
 271         th = mdt_trans_start(env, mdt);
 272         if (IS_ERR(th))
 273                 RETURN(PTR_ERR(th));
 274
 275         mti->mti_off = 0;
 276         lsd_cpu_to_le(&mdt->mdt_lsd, &mti->mti_lsd);
 277
 278         if (need_sync && mti->mti_exp)
 279                 mdt_trans_add_cb(th, mdt_client_cb, mti->mti_exp);
 280
 281         rc = mdt_record_write(env, mdt->mdt_last_rcvd,
 282                               mdt_buf_const(env, &mti->mti_lsd,
 283                                             sizeof(mti->mti_lsd)),
 284                               &mti->mti_off, th);
 285
 286         mdt_trans_stop(env, mdt, th);
 287
 288         CDEBUG(D_INFO, "write last_rcvd header rc = %d:\n"
 289                "uuid = %s\nlast_transno = "LPU64"\n",
 290                rc, mdt->mdt_lsd.lsd_uuid, mdt->mdt_lsd.lsd_last_transno);
 291
 292         RETURN(rc);
 293 }
 294
 295 static int mdt_last_rcvd_read(const struct lu_env *env,
 296                               struct mdt_device *mdt,
 297                               struct lsd_client_data *lcd, loff_t *off)
 298 {
 299         struct mdt_thread_info *mti;
 300         struct lsd_client_data *tmp;
 301         int rc;
 302
 303         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 304         tmp = &mti->mti_lcd;
 305         rc = mdt_record_read(env, mdt->mdt_last_rcvd,
 306                              mdt_buf(env, tmp, sizeof(*tmp)), off);
 307         if (rc == 0)
 308                 lcd_le_to_cpu(tmp, lcd);
 309
 310         CDEBUG(D_INFO, "read lcd @%d rc = %d:\n"
 311                        "uuid = %s\n"
 312                        "last_transno = "LPU64"\n"
 313                        "last_xid = "LPU64"\n"
 314                        "last_result = %u\n"
 315                        "last_data = %u\n"
 316                        "last_close_transno = "LPU64"\n"
 317                        "last_close_xid = "LPU64"\n"
 318                        "last_close_result = %u\n",
 319                         (int)(*off - sizeof(*tmp)),
 320                         rc,
 321                         lcd->lcd_uuid,
 322                         lcd->lcd_last_transno,
 323                         lcd->lcd_last_xid,
 324                         lcd->lcd_last_result,
 325                         lcd->lcd_last_data,
 326                         lcd->lcd_last_close_transno,
 327                         lcd->lcd_last_close_xid,
 328                         lcd->lcd_last_close_result);
 329         return rc;
 330 }
 331
 332 static int mdt_last_rcvd_write(const struct lu_env *env,
 333                                struct mdt_device *mdt,
 334                                struct lsd_client_data *lcd,
 335                                loff_t *off, struct thandle *th)
 336 {
 337         struct mdt_thread_info *mti;
 338         struct lsd_client_data *tmp;
 339         int rc;
 340
 341         LASSERT(th != NULL);
 342         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 343         tmp = &mti->mti_lcd;
 344
 345         lcd_cpu_to_le(lcd, tmp);
 346
 347         rc = mdt_record_write(env, mdt->mdt_last_rcvd,
 348                               mdt_buf_const(env, tmp, sizeof(*tmp)), off, th);
 349
 350         CDEBUG(D_INFO, "write lcd @%d rc = %d:\n"
 351                        "uuid = %s\n"
 352                        "last_transno = "LPU64"\n"
 353                        "last_xid = "LPU64"\n"
 354                        "last_result = %u\n"
 355                        "last_data = %u\n"
 356                        "last_close_transno = "LPU64"\n"
 357                        "last_close_xid = "LPU64"\n"
 358                        "last_close_result = %u\n",
 359                         (int)(*off - sizeof(*tmp)),
 360                         rc,
 361                         lcd->lcd_uuid,
 362                         lcd->lcd_last_transno,
 363                         lcd->lcd_last_xid,
 364                         lcd->lcd_last_result,
 365                         lcd->lcd_last_data,
 366                         lcd->lcd_last_close_transno,
 367                         lcd->lcd_last_close_xid,
 368                         lcd->lcd_last_close_result);
 369         return rc;
 370 }
 371
 372 static int mdt_clients_data_init(const struct lu_env *env,
 373                                  struct mdt_device *mdt,
 374                                  unsigned long last_size)
 375 {
 376         struct lr_server_data  *lsd = &mdt->mdt_lsd;
 377         struct lsd_client_data *lcd = NULL;
 378         struct obd_device      *obd = mdt2obd_dev(mdt);
 379         loff_t off;
 380         int cl_idx;
 381         int rc = 0;
 382         ENTRY;
 383
 384         /* When we do a clean MDS shutdown, we save the last_transno into
 385          * the header.  If we find clients with higher last_transno values
 386          * then those clients may need recovery done. */
 387         LASSERT(atomic_read(&obd->obd_req_replay_clients) == 0);
 388         for (cl_idx = 0, off = lsd->lsd_client_start;
 389              off < last_size; cl_idx++) {
 390                 __u64 last_transno;
 391                 struct obd_export *exp;
 392
 393                 if (!lcd) {
 394                         OBD_ALLOC_PTR(lcd);
 395                         if (!lcd)
 396                                 RETURN(-ENOMEM);
 397                 }
 398
 399                 off = lsd->lsd_client_start +
 400                         cl_idx * lsd->lsd_client_size;
 401
 402                 rc = mdt_last_rcvd_read(env, mdt, lcd, &off);
 403                 if (rc) {
 404                         CERROR("error reading MDS %s idx %d, off %llu: rc %d\n",
 405                                LAST_RCVD, cl_idx, off, rc);
 406                         rc = 0;
 407                         break; /* read error shouldn't cause startup to fail */
 408                 }
 409
 410                 if (lcd->lcd_uuid[0] == '\0') {
 411                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
 412                                cl_idx);
 413                         continue;
 414                 }
 415
 416                 last_transno = lcd_last_transno(lcd);
 417
 418                 /* These exports are cleaned up by mdt_obd_disconnect(), so
 419                  * they need to be set up like real exports as
 420                  * mdt_obd_connect() does.
 421                  */
 422                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
 423                        " srv lr: "LPU64" lx: "LPU64"\n", lcd->lcd_uuid, cl_idx,
 424                        last_transno, lsd->lsd_last_transno,
 425                        lcd_last_xid(lcd));
 426
 427                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
 428                 if (IS_ERR(exp)) {
 429                         if (PTR_ERR(exp) == -EALREADY) {
 430                                 /* export already exists, zero out this one */
 431                                 lcd->lcd_uuid[0] = '\0';
 432                         } else
 433                                 GOTO(err_client, rc = PTR_ERR(exp));
 434                 } else {
 435                         struct mdt_thread_info *mti;
 436                         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 437                         LASSERT(mti != NULL);
 438                         mti->mti_exp = exp;
 439                         exp->exp_mdt_data.med_lcd = lcd;
 440                         rc = mdt_client_add(env, mdt, cl_idx);
 441                         /* can't fail existing */
 442                         LASSERTF(rc == 0, "rc = %d\n", rc);
 443                         lcd = NULL;
 444                         spin_lock(&exp->exp_lock);
 445                         exp->exp_connecting = 0;
 446                         exp->exp_in_recovery = 0;
 447                         spin_unlock(&exp->exp_lock);
 448                         obd->obd_max_recoverable_clients++;
 449                         class_export_put(exp);
 450                 }
 451
 452                 CDEBUG(D_OTHER, "client at idx %d has last_transno="LPU64"\n",
 453                        cl_idx, last_transno);
 454                 /* protect __u64 value update */
 455                 spin_lock(&mdt->mdt_transno_lock);
 456                 mdt->mdt_last_transno = max(last_transno,
 457                                             mdt->mdt_last_transno);
 458                 spin_unlock(&mdt->mdt_transno_lock);
 459         }
 460
 461 err_client:
 462         if (lcd)
 463                 OBD_FREE_PTR(lcd);
 464         RETURN(rc);
 465 }
 466
 467 static int mdt_server_data_init(const struct lu_env *env,
 468                                 struct mdt_device *mdt,
 469                                 struct lustre_sb_info *lsi)
 470 {
 471         struct lr_server_data  *lsd = &mdt->mdt_lsd;
 472         struct lsd_client_data *lcd = NULL;
 473         struct obd_device      *obd = mdt2obd_dev(mdt);
 474         struct mdt_thread_info *mti;
 475         struct dt_object       *obj;
 476         struct lu_attr         *la;
 477         struct lustre_disk_data  *ldd;
 478         unsigned long last_rcvd_size;
 479         __u64 mount_count;
 480         int rc;
 481         ENTRY;
 482
 483         /* ensure padding in the struct is the correct size */
 484         CLASSERT(offsetof(struct lr_server_data, lsd_padding) +
 485                 sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
 486         CLASSERT(offsetof(struct lsd_client_data, lcd_padding) +
 487                 sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
 488
 489         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 490         LASSERT(mti != NULL);
 491         la = &mti->mti_attr.ma_attr;
 492
 493         obj = mdt->mdt_last_rcvd;
 494         rc = obj->do_ops->do_attr_get(env, mdt->mdt_last_rcvd, la, BYPASS_CAPA);
 495         if (rc)
 496                 RETURN(rc);
 497
 498         last_rcvd_size = (unsigned long)la->la_size;
 499
 500         if (last_rcvd_size == 0) {
 501                 LCONSOLE_WARN("%s: new disk, initializing\n", obd->obd_name);
 502
 503                 memcpy(lsd->lsd_uuid, obd->obd_uuid.uuid,
 504                        sizeof(lsd->lsd_uuid));
 505                 lsd->lsd_last_transno = 0;
 506                 lsd->lsd_mount_count = 0;
 507                 lsd->lsd_server_size = LR_SERVER_SIZE;
 508                 lsd->lsd_client_start = LR_CLIENT_START;
 509                 lsd->lsd_client_size = LR_CLIENT_SIZE;
 510                 lsd->lsd_feature_rocompat = OBD_ROCOMPAT_LOVOBJID;
 511                 lsd->lsd_feature_incompat = OBD_INCOMPAT_MDT |
 512                                                        OBD_INCOMPAT_COMMON_LR;
 513         } else {
 514                 LCONSOLE_WARN("%s: used disk, loading\n", obd->obd_name);
 515                 rc = mdt_last_rcvd_header_read(env, mdt);
 516                 if (rc) {
 517                         CERROR("error reading MDS %s: rc %d\n", LAST_RCVD, rc);
 518                         GOTO(out, rc);
 519                 }
 520                 if (strcmp(lsd->lsd_uuid, obd->obd_uuid.uuid) != 0) {
 521                         LCONSOLE_ERROR_MSG(0x157, "Trying to start OBD %s using"
 522                                            "the wrong disk %s. Were the /dev/ "
 523                                            "assignments rearranged?\n",
 524                                            obd->obd_uuid.uuid, lsd->lsd_uuid);
 525                         GOTO(out, rc = -EINVAL);
 526                 }
 527         }
 528         mount_count = lsd->lsd_mount_count;
 529
 530         ldd = lsi->lsi_ldd;
 531
 532         if (ldd->ldd_flags & LDD_F_IAM_DIR)
 533                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_IAM_DIR;
 534
 535         lsd->lsd_feature_compat = OBD_COMPAT_MDT;
 536         lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
 537
 538         spin_lock(&mdt->mdt_transno_lock);
 539         mdt->mdt_last_transno = lsd->lsd_last_transno;
 540         spin_unlock(&mdt->mdt_transno_lock);
 541
 542         CDEBUG(D_INODE, "========BEGIN DUMPING LAST_RCVD========\n");
 543         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
 544                obd->obd_name, mdt->mdt_last_transno);
 545         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
 546                obd->obd_name, mount_count + 1);
 547         CDEBUG(D_INODE, "%s: server data size: %u\n",
 548                obd->obd_name, lsd->lsd_server_size);
 549         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
 550                obd->obd_name, lsd->lsd_client_start);
 551         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
 552                obd->obd_name, lsd->lsd_client_size);
 553         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
 554                obd->obd_name, last_rcvd_size);
 555         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", obd->obd_name,
 556                last_rcvd_size <= lsd->lsd_client_start ? 0 :
 557                (last_rcvd_size - lsd->lsd_client_start) /
 558                 lsd->lsd_client_size);
 559         CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
 560
 561         if (!lsd->lsd_server_size || !lsd->lsd_client_start ||
 562             !lsd->lsd_client_size) {
 563                 CERROR("Bad last_rcvd contents!\n");
 564                 GOTO(out, rc = -EINVAL);
 565         }
 566
 567         rc = mdt_clients_data_init(env, mdt, last_rcvd_size);
 568         if (rc)
 569                 GOTO(err_client, rc);
 570
 571         spin_lock(&mdt->mdt_transno_lock);
 572         /* obd_last_committed is used for compatibility
 573          * with other lustre recovery code */
 574         obd->obd_last_committed = mdt->mdt_last_transno;
 575         spin_unlock(&mdt->mdt_transno_lock);
 576
 577         mdt->mdt_mount_count++;
 578         lsd->lsd_mount_count = mdt->mdt_mount_count;
 579
 580         /* save it, so mount count and last_transno is current */
 581         rc = mdt_server_data_update(env, mdt, (mti->mti_exp &&
 582                                                mti->mti_exp->exp_need_sync));
 583         if (rc)
 584                 GOTO(err_client, rc);
 585
 586         RETURN(0);
 587
 588 err_client:
 589         target_recovery_fini(obd);
 590 out:
 591         return rc;
 592 }
 593
 594 static int mdt_server_data_update(const struct lu_env *env,
 595                                   struct mdt_device *mdt,
 596                                   int need_sync)
 597 {
 598         int rc = 0;
 599         ENTRY;
 600
 601         CDEBUG(D_SUPER, "MDS mount_count is "LPU64", last_transno is "LPU64"\n",
 602                mdt->mdt_mount_count, mdt->mdt_last_transno);
 603
 604         spin_lock(&mdt->mdt_transno_lock);
 605         mdt->mdt_lsd.lsd_last_transno = mdt->mdt_last_transno;
 606         spin_unlock(&mdt->mdt_transno_lock);
 607
 608         /*
 609          * This may be called from difficult reply handler and
 610          * mdt->mdt_last_rcvd may be NULL that time.
 611          */
 612         if (mdt->mdt_last_rcvd != NULL)
 613                 rc = mdt_last_rcvd_header_write(env, mdt, need_sync);
 614         RETURN(rc);
 615 }
 616
 617 int mdt_client_new(const struct lu_env *env, struct mdt_device *mdt)
 618 {
 619         unsigned long *bitmap = mdt->mdt_client_bitmap;
 620         struct mdt_thread_info *mti;
 621         struct mdt_export_data *med;
 622         struct lsd_client_data *lcd;
 623         struct lr_server_data  *lsd = &mdt->mdt_lsd;
 624         struct obd_device *obd = mdt2obd_dev(mdt);
 625         struct thandle *th;
 626         loff_t off;
 627         int rc;
 628         int cl_idx;
 629         ENTRY;
 630
 631         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 632         LASSERT(mti != NULL);
 633
 634         med = &mti->mti_exp->exp_mdt_data;
 635         lcd = med->med_lcd;
 636
 637         LASSERT(bitmap != NULL);
 638         if (!strcmp(med->med_lcd->lcd_uuid, obd->obd_uuid.uuid))
 639                 RETURN(0);
 640
 641         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 642          * there's no need for extra complication here
 643          */
 644         spin_lock(&mdt->mdt_client_bitmap_lock);
 645         cl_idx = find_first_zero_bit(bitmap, LR_MAX_CLIENTS);
 646         if (cl_idx >= LR_MAX_CLIENTS ||
 647             OBD_FAIL_CHECK(OBD_FAIL_MDS_CLIENT_ADD)) {
 648                 CERROR("no room for %u clients - fix LR_MAX_CLIENTS\n",
 649                        cl_idx);
 650                 spin_unlock(&mdt->mdt_client_bitmap_lock);
 651                 RETURN(-EOVERFLOW);
 652         }
 653         set_bit(cl_idx, bitmap);
 654         spin_unlock(&mdt->mdt_client_bitmap_lock);
 655
 656         CDEBUG(D_INFO, "client at idx %d with UUID '%s' added\n",
 657                cl_idx, med->med_lcd->lcd_uuid);
 658
 659         med->med_lr_idx = cl_idx;
 660         med->med_lr_off = lsd->lsd_client_start +
 661                           (cl_idx * lsd->lsd_client_size);
 662         init_mutex(&med->med_lcd_lock);
 663
 664         LASSERTF(med->med_lr_off > 0, "med_lr_off = %llu\n", med->med_lr_off);
 665
 666         /* Write new client data. */
 667         off = med->med_lr_off;
 668         mdt_trans_credit_init(env, mdt, MDT_TXN_LAST_RCVD_WRITE_OP);
 669
 670         th = mdt_trans_start(env, mdt);
 671         if (IS_ERR(th))
 672                 RETURN(PTR_ERR(th));
 673
 674         /*
 675          * Until this operations will be committed the sync is needed
 676          * for this export. This should be done _after_ starting the
 677          * transaction so that many connecting clients will not bring
 678          * server down with lots of sync writes.
 679          */
 680         mdt_trans_add_cb(th, mdt_client_cb, mti->mti_exp);
 681         spin_lock(&mti->mti_exp->exp_lock);
 682         mti->mti_exp->exp_need_sync = 1;
 683         spin_unlock(&mti->mti_exp->exp_lock);
 684
 685         rc = mdt_last_rcvd_write(env, mdt, lcd, &off, th);
 686         CDEBUG(D_INFO, "wrote client lcd at idx %u off %llu (len "LPSZ")\n",
 687                cl_idx, med->med_lr_off, sizeof(*lcd));
 688         mdt_trans_stop(env, mdt, th);
 689
 690         RETURN(rc);
 691 }
 692
 693 /* Add client data to the MDS.  We use a bitmap to locate a free space
 694  * in the last_rcvd file if cl_off is -1 (i.e. a new client).
 695  * Otherwise, we just have to read the data from the last_rcvd file and
 696  * we know its offset.
 697  *
 698  * It should not be possible to fail adding an existing client - otherwise
 699  * mdt_init_server_data() callsite needs to be fixed.
 700  */
 701 int mdt_client_add(const struct lu_env *env,
 702                    struct mdt_device *mdt, int cl_idx)
 703 {
 704         struct mdt_thread_info *mti;
 705         struct mdt_export_data *med;
 706         unsigned long *bitmap = mdt->mdt_client_bitmap;
 707         struct obd_device *obd = mdt2obd_dev(mdt);
 708         struct lr_server_data *lsd = &mdt->mdt_lsd;
 709         int rc = 0;
 710         ENTRY;
 711
 712         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 713         LASSERT(mti != NULL);
 714
 715         med = &mti->mti_exp->exp_mdt_data;
 716
 717         LASSERT(bitmap != NULL);
 718         LASSERTF(cl_idx >= 0, "%d\n", cl_idx);
 719
 720         if (!strcmp(med->med_lcd->lcd_uuid, obd->obd_uuid.uuid))
 721                 RETURN(0);
 722
 723         spin_lock(&mdt->mdt_client_bitmap_lock);
 724         if (test_and_set_bit(cl_idx, bitmap)) {
 725                 CERROR("MDS client %d: bit already set in bitmap!!\n",
 726                        cl_idx);
 727                 LBUG();
 728         }
 729         spin_unlock(&mdt->mdt_client_bitmap_lock);
 730
 731         CDEBUG(D_INFO, "client at idx %d with UUID '%s' added\n",
 732                cl_idx, med->med_lcd->lcd_uuid);
 733
 734         med->med_lr_idx = cl_idx;
 735         med->med_lr_off = lsd->lsd_client_start +
 736                           (cl_idx * lsd->lsd_client_size);
 737         init_mutex(&med->med_lcd_lock);
 738
 739         LASSERTF(med->med_lr_off > 0, "med_lr_off = %llu\n", med->med_lr_off);
 740
 741         RETURN(rc);
 742 }
 743
 744 int mdt_client_del(const struct lu_env *env, struct mdt_device *mdt)
 745 {
 746         struct mdt_thread_info *mti;
 747         struct mdt_export_data *med;
 748         struct lsd_client_data *lcd;
 749         struct obd_device      *obd = mdt2obd_dev(mdt);
 750         struct obd_export      *exp;
 751         struct thandle         *th;
 752         int                     need_sync;
 753         loff_t                  off;
 754         int                     rc = 0;
 755         ENTRY;
 756
 757         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 758         LASSERT(mti != NULL);
 759
 760         exp = mti->mti_exp;
 761         med = &exp->exp_mdt_data;
 762         lcd = med->med_lcd;
 763         if (!lcd)
 764                 RETURN(0);
 765
 766         /* XXX: If lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 767         if (!strcmp(lcd->lcd_uuid, obd->obd_uuid.uuid))
 768                 GOTO(free, 0);
 769
 770         CDEBUG(D_INFO, "freeing client at idx %u, offset %lld\n",
 771                med->med_lr_idx, med->med_lr_off);
 772
 773         off = med->med_lr_off;
 774
 775         /*
 776          * Don't clear med_lr_idx here as it is likely also unset.  At worst we
 777          * leak a client slot that will be cleaned on the next recovery.
 778          */
 779         if (off <= 0) {
 780                 CERROR("client idx %d has offset %lld\n",
 781                         med->med_lr_idx, off);
 782                 GOTO(free, rc = -EINVAL);
 783         }
 784
 785         /*
 786          * Clear the bit _after_ zeroing out the client so we don't race with
 787          * mdt_client_add and zero out new clients.
 788          */
 789         if (!test_bit(med->med_lr_idx, mdt->mdt_client_bitmap)) {
 790                 CERROR("MDT client %u: bit already clear in bitmap!!\n",
 791                        med->med_lr_idx);
 792                 LBUG();
 793         }
 794
 795         /* Don't force sync on disconnect if aborting recovery,
 796          * or it does num_clients * num_osts.  b=17194 */
 797         need_sync = (!exp->exp_libclient || exp->exp_need_sync) &&
 798                      !(exp->exp_flags & OBD_OPT_ABORT_RECOV);
 799
 800         /*
 801          * This may be called from difficult reply handler path and
 802          * mdt->mdt_last_rcvd may be NULL that time.
 803          */
 804         if (mdt->mdt_last_rcvd != NULL) {
 805                 mdt_trans_credit_init(env, mdt, MDT_TXN_LAST_RCVD_WRITE_OP);
 806
 807                 spin_lock(&exp->exp_lock);
 808                 exp->exp_need_sync = need_sync;
 809                 spin_unlock(&exp->exp_lock);
 810
 811                 th = mdt_trans_start(env, mdt);
 812                 if (IS_ERR(th))
 813                         GOTO(free, rc = PTR_ERR(th));
 814
 815                 if (need_sync) {
 816                         /*
 817                          * Until this operations will be committed the sync
 818                          * is needed for this export.
 819                          */
 820                         mdt_trans_add_cb(th, mdt_client_cb, exp);
 821                 }
 822
 823                 mutex_down(&med->med_lcd_lock);
 824                 memset(lcd, 0, sizeof *lcd);
 825
 826                 rc = mdt_last_rcvd_write(env, mdt, lcd, &off, th);
 827                 mutex_up(&med->med_lcd_lock);
 828                 mdt_trans_stop(env, mdt, th);
 829         }
 830
 831         CDEBUG(rc == 0 ? D_INFO : D_ERROR, "Zeroing out client idx %u in "
 832                "%s %ssync rc %d\n",  med->med_lr_idx, LAST_RCVD,
 833                need_sync ? "" : "a", rc);
 834
 835         spin_lock(&mdt->mdt_client_bitmap_lock);
 836         clear_bit(med->med_lr_idx, mdt->mdt_client_bitmap);
 837         spin_unlock(&mdt->mdt_client_bitmap_lock);
 838
 839         /*
 840          * Make sure the server's last_transno is up to date. Do this
 841          * after the client is freed so we know all the client's
 842          * transactions have been committed.
 843          */
 844         mdt_server_data_update(env, mdt, need_sync);
 845
 846         EXIT;
 847 free:
 848         OBD_FREE_PTR(lcd);
 849         med->med_lcd = NULL;
 850         return 0;
 851 }
 852
 853 /*
 854  * last_rcvd & last_committed update callbacks
 855  */
 856 static int mdt_last_rcvd_update(struct mdt_thread_info *mti,
 857                                 struct thandle *th)
 858 {
 859         struct mdt_device *mdt = mti->mti_mdt;
 860         struct ptlrpc_request *req = mdt_info_req(mti);
 861         struct mdt_export_data *med;
 862         struct lsd_client_data *lcd;
 863         loff_t off;
 864         int err;
 865         __s32 rc = th->th_result;
 866         __u64 *transno_p;
 867
 868         ENTRY;
 869         LASSERT(req);
 870         LASSERT(req->rq_export);
 871         LASSERT(mdt);
 872         med = &req->rq_export->exp_mdt_data;
 873         LASSERT(med);
 874         lcd = med->med_lcd;
 875         /* if the export has already been failed, we have no last_rcvd slot */
 876         if (req->rq_export->exp_failed) {
 877                 CWARN("commit transaction for disconnected client %s: rc %d\n",
 878                       req->rq_export->exp_client_uuid.uuid, rc);
 879                 if (rc == 0)
 880                         rc = -ENOTCONN;
 881                 RETURN(rc);
 882         }
 883
 884         off = med->med_lr_off;
 885         mutex_down(&med->med_lcd_lock);
 886         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
 887             lustre_msg_get_opc(req->rq_reqmsg) == MDS_DONE_WRITING) {
 888                 transno_p = &lcd->lcd_last_close_transno;
 889                 lcd->lcd_last_close_xid = req->rq_xid;
 890                 lcd->lcd_last_close_result = rc;
 891         } else {
 892                 transno_p = &lcd->lcd_last_transno;
 893                 lcd->lcd_last_xid = req->rq_xid;
 894                 lcd->lcd_last_result = rc;
 895                 /*XXX: save intent_disposition in mdt_thread_info?
 896                  * also there is bug - intent_dispostion is __u64,
 897                  * see struct ldlm_reply->lock_policy_res1; */
 898                 lcd->lcd_last_data = mti->mti_opdata;
 899         }
 900
 901         /*
 902          * When we store zero transno in lcd we can lost last transno value
 903          * because lcd contains 0, but lsd is not yet written
 904          * The server data should be updated also if the latest
 905          * transno is rewritten by zero. See the bug 11125 for details.
 906          */
 907         if (mti->mti_transno == 0 &&
 908             *transno_p == mdt->mdt_last_transno)
 909                 mdt_server_data_update(mti->mti_env, mdt,
 910                                       (mti->mti_exp &&
 911                                        mti->mti_exp->exp_need_sync));
 912
 913         *transno_p = mti->mti_transno;
 914
 915         if (off <= 0) {
 916                 CERROR("client idx %d has offset %lld\n", med->med_lr_idx, off);
 917                 err = -EINVAL;
 918         } else {
 919                 err = mdt_last_rcvd_write(mti->mti_env, mdt, lcd, &off, th);
 920         }
 921         mutex_up(&med->med_lcd_lock);
 922         RETURN(err);
 923 }
 924
 925 extern struct lu_context_key mdt_thread_key;
 926
 927 /* add credits for last_rcvd update */
 928 static int mdt_txn_start_cb(const struct lu_env *env,
 929                             struct txn_param *param, void *cookie)
 930 {
 931         struct mdt_device *mdt = cookie;
 932
 933         param->tp_credits += mdt_trans_credit_get(env, mdt,
 934                                                   MDT_TXN_LAST_RCVD_WRITE_OP);
 935         return 0;
 936 }
 937
 938 /* Update last_rcvd records with latests transaction data */
 939 static int mdt_txn_stop_cb(const struct lu_env *env,
 940                            struct thandle *txn, void *cookie)
 941 {
 942         struct mdt_device *mdt = cookie;
 943         struct mdt_txn_info *txi;
 944         struct mdt_thread_info *mti;
 945         struct ptlrpc_request *req;
 946
 947         /* transno in two contexts - for commit_cb and for thread */
 948         txi = lu_context_key_get(&txn->th_ctx, &mdt_txn_key);
 949         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 950         req = mdt_info_req(mti);
 951
 952         if (mti->mti_mdt == NULL || req == NULL || mti->mti_no_need_trans) {
 953                 txi->txi_transno = 0;
 954                 mti->mti_no_need_trans = 0;
 955                 return 0;
 956         }
 957
 958         if (mti->mti_has_trans) {
 959                 /* XXX: currently there are allowed cases, but the wrong cases
 960                  * are also possible, so better check is needed here */
 961                 CDEBUG(D_INFO, "More than one transaction "LPU64"\n",
 962                        mti->mti_transno);
 963                 return 0;
 964         }
 965
 966         mti->mti_has_trans = 1;
 967         spin_lock(&mdt->mdt_transno_lock);
 968         if (txn->th_result != 0) {
 969                 if (mti->mti_transno != 0) {
 970                         CERROR("Replay transno "LPU64" failed: rc %i\n",
 971                                mti->mti_transno, txn->th_result);
 972                         mti->mti_transno = 0;
 973                 }
 974         } else if (mti->mti_transno == 0) {
 975                 mti->mti_transno = ++ mdt->mdt_last_transno;
 976         } else {
 977                 /* should be replay */
 978                 if (mti->mti_transno > mdt->mdt_last_transno)
 979                         mdt->mdt_last_transno = mti->mti_transno;
 980         }
 981
 982         /* sometimes the reply message has not been successfully packed */
 983         LASSERT(req != NULL && req->rq_repmsg != NULL);
 984
 985         /* filling reply data */
 986         CDEBUG(D_INODE, "transno = %llu, last_committed = %llu\n",
 987                mti->mti_transno, req->rq_export->exp_obd->obd_last_committed);
 988
 989         req->rq_transno = mti->mti_transno;
 990         lustre_msg_set_transno(req->rq_repmsg, mti->mti_transno);
 991         lustre_msg_set_last_xid(req->rq_repmsg,
 992                          lcd_last_xid(req->rq_export->exp_mdt_data.med_lcd));
 993         /* save transno for the commit callback */
 994         txi->txi_transno = mti->mti_transno;
 995         spin_unlock(&mdt->mdt_transno_lock);
 996
 997         return mdt_last_rcvd_update(mti, txn);
 998 }
 999
1000 /* commit callback, need to update last_committed value */
1001 static int mdt_txn_commit_cb(const struct lu_env *env,
1002                              struct thandle *txn, void *cookie)
1003 {
1004         struct mdt_device *mdt = cookie;
1005         struct obd_device *obd = mdt2obd_dev(mdt);
1006         struct mdt_txn_info *txi;
1007         int i;
1008
1009         txi = lu_context_key_get(&txn->th_ctx, &mdt_txn_key);
1010
1011         /* copy of obd_transno_commit_cb() but with locking */
1012         spin_lock(&mdt->mdt_transno_lock);
1013         if (txi->txi_transno > obd->obd_last_committed) {
1014                 obd->obd_last_committed = txi->txi_transno;
1015                 spin_unlock(&mdt->mdt_transno_lock);
1016                 ptlrpc_commit_replies(obd);
1017         } else
1018                 spin_unlock(&mdt->mdt_transno_lock);
1019
1020         if (txi->txi_transno)
1021                 CDEBUG(D_HA, "%s: transno "LPD64" is committed\n",
1022                        obd->obd_name, txi->txi_transno);
1023
1024         /* iterate through all additional callbacks */
1025         for (i = 0; i < txi->txi_cb_count; i++) {
1026                 txi->txi_cb[i].mdt_cb_func(mdt, txi->txi_transno,
1027                                            txi->txi_cb[i].mdt_cb_data, 0);
1028         }
1029         return 0;
1030 }
1031
1032 int mdt_fs_setup(const struct lu_env *env, struct mdt_device *mdt,
1033                  struct obd_device *obd,
1034                  struct lustre_sb_info *lsi)
1035 {
1036         struct lu_fid fid;
1037         struct dt_object *o;
1038         int rc = 0;
1039         ENTRY;
1040
1041         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_FS_SETUP))
1042                 RETURN(-ENOENT);
1043
1044         /* prepare transactions callbacks */
1045         mdt->mdt_txn_cb.dtc_txn_start = mdt_txn_start_cb;
1046         mdt->mdt_txn_cb.dtc_txn_stop = mdt_txn_stop_cb;
1047         mdt->mdt_txn_cb.dtc_txn_commit = mdt_txn_commit_cb;
1048         mdt->mdt_txn_cb.dtc_cookie = mdt;
1049         CFS_INIT_LIST_HEAD(&mdt->mdt_txn_cb.dtc_linkage);
1050
1051         dt_txn_callback_add(mdt->mdt_bottom, &mdt->mdt_txn_cb);
1052
1053         o = dt_store_open(env, mdt->mdt_bottom, "", LAST_RCVD, &fid);
1054         if (!IS_ERR(o)) {
1055                 mdt->mdt_last_rcvd = o;
1056                 rc = mdt_server_data_init(env, mdt, lsi);
1057                 if (rc)
1058                         GOTO(put_last_rcvd, rc);
1059         } else {
1060                 rc = PTR_ERR(o);
1061                 CERROR("cannot open %s: rc = %d\n", LAST_RCVD, rc);
1062                 RETURN(rc);
1063         }
1064
1065         o = dt_store_open(env, mdt->mdt_bottom, "", CAPA_KEYS, &fid);
1066         if (!IS_ERR(o)) {
1067                 mdt->mdt_ck_obj = o;
1068                 rc = mdt_capa_keys_init(env, mdt);
1069                 if (rc)
1070                         GOTO(put_ck_object, rc);
1071         } else {
1072                 rc = PTR_ERR(o);
1073                 CERROR("cannot open %s: rc = %d\n", CAPA_KEYS, rc);
1074                 GOTO(put_last_rcvd, rc);
1075         }
1076         RETURN(0);
1077
1078 put_ck_object:
1079         lu_object_put(env, &o->do_lu);
1080         mdt->mdt_ck_obj = NULL;
1081 put_last_rcvd:
1082         lu_object_put(env, &mdt->mdt_last_rcvd->do_lu);
1083         mdt->mdt_last_rcvd = NULL;
1084         return rc;
1085 }
1086
1087 void mdt_fs_cleanup(const struct lu_env *env, struct mdt_device *mdt)
1088 {
1089         ENTRY;
1090
1091         /* Remove transaction callback */
1092         dt_txn_callback_del(mdt->mdt_bottom, &mdt->mdt_txn_cb);
1093         if (mdt->mdt_last_rcvd)
1094                 lu_object_put(env, &mdt->mdt_last_rcvd->do_lu);
1095         mdt->mdt_last_rcvd = NULL;
1096         if (mdt->mdt_ck_obj)
1097                 lu_object_put(env, &mdt->mdt_ck_obj->do_lu);
1098         mdt->mdt_ck_obj = NULL;
1099         EXIT;
1100 }
1101
1102 /* reconstruction code */
1103 static void mdt_steal_ack_locks(struct ptlrpc_request *req)
1104 {
1105         struct obd_export         *exp = req->rq_export;
1106         struct list_head          *tmp;
1107         struct ptlrpc_reply_state *oldrep;
1108         struct ptlrpc_service     *svc;
1109         int                        i;
1110
1111         /* CAVEAT EMPTOR: spinlock order */
1112         spin_lock(&exp->exp_lock);
1113         list_for_each (tmp, &exp->exp_outstanding_replies) {
1114                 oldrep = list_entry(tmp, struct ptlrpc_reply_state,rs_exp_list);
1115
1116                 if (oldrep->rs_xid != req->rq_xid)
1117                         continue;
1118
1119                 if (lustre_msg_get_opc(oldrep->rs_msg) !=
1120                     lustre_msg_get_opc(req->rq_reqmsg))
1121                         CERROR ("Resent req xid "LPX64" has mismatched opc: "
1122                                 "new %d old %d\n", req->rq_xid,
1123                                 lustre_msg_get_opc(req->rq_reqmsg),
1124                                 lustre_msg_get_opc(oldrep->rs_msg));
1125
1126                 svc = oldrep->rs_service;
1127                 spin_lock (&svc->srv_lock);
1128
1129                 list_del_init (&oldrep->rs_exp_list);
1130
1131                 CWARN("Stealing %d locks from rs %p x"LPD64".t"LPD64
1132                       " o%d NID %s\n",
1133                       oldrep->rs_nlocks, oldrep,
1134                       oldrep->rs_xid, oldrep->rs_transno,
1135                       lustre_msg_get_opc(oldrep->rs_msg),
1136                       libcfs_nid2str(exp->exp_connection->c_peer.nid));
1137
1138                 for (i = 0; i < oldrep->rs_nlocks; i++)
1139                         ptlrpc_save_lock(req, &oldrep->rs_locks[i],
1140                                          oldrep->rs_modes[i], 0);
1141                 oldrep->rs_nlocks = 0;
1142
1143                 DEBUG_REQ(D_HA, req, "stole locks for");
1144                 spin_lock(&oldrep->rs_lock);
1145                 ptlrpc_schedule_difficult_reply (oldrep);
1146                 spin_unlock(&oldrep->rs_lock);
1147
1148                 spin_unlock (&svc->srv_lock);
1149                 break;
1150         }
1151         spin_unlock(&exp->exp_lock);
1152 }
1153
1154 void mdt_req_from_lcd(struct ptlrpc_request *req,
1155                       struct lsd_client_data *lcd)
1156 {
1157         DEBUG_REQ(D_HA, req, "restoring transno "LPD64"/status %d",
1158                   lcd->lcd_last_transno, lcd->lcd_last_result);
1159
1160         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
1161             lustre_msg_get_opc(req->rq_repmsg) == MDS_DONE_WRITING) {
1162                 req->rq_transno = lcd->lcd_last_close_transno;
1163                 req->rq_status = lcd->lcd_last_close_result;
1164                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
1165                 lustre_msg_set_status(req->rq_repmsg, req->rq_status);
1166         } else {
1167                 req->rq_transno = lcd->lcd_last_transno;
1168                 req->rq_status = lcd->lcd_last_result;
1169                 lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
1170                 lustre_msg_set_status(req->rq_repmsg, req->rq_status);
1171         }
1172         mdt_steal_ack_locks(req);
1173 }
1174
1175 void mdt_reconstruct_generic(struct mdt_thread_info *mti,
1176                              struct mdt_lock_handle *lhc)
1177 {
1178         struct ptlrpc_request *req = mdt_info_req(mti);
1179         struct mdt_export_data *med = &req->rq_export->exp_mdt_data;
1180
1181         return mdt_req_from_lcd(req, med->med_lcd);
1182 }
1183
1184 static void mdt_reconstruct_create(struct mdt_thread_info *mti,
1185                                    struct mdt_lock_handle *lhc)
1186 {
1187         struct ptlrpc_request  *req = mdt_info_req(mti);
1188         struct obd_export *exp = req->rq_export;
1189         struct mdt_export_data *med = &exp->exp_mdt_data;
1190         struct mdt_device *mdt = mti->mti_mdt;
1191         struct mdt_object *child;
1192         struct mdt_body *body;
1193         int rc;
1194
1195         mdt_req_from_lcd(req, med->med_lcd);
1196         if (req->rq_status)
1197                 return;
1198
1199         /* if no error, so child was created with requested fid */
1200         child = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid2);
1201         if (IS_ERR(child)) {
1202                 rc = PTR_ERR(child);
1203                 LCONSOLE_WARN("Child "DFID" lookup error %d."
1204                               " Evicting client %s with export %s.\n",
1205                               PFID(mdt_object_fid(child)), rc,
1206                               obd_uuid2str(&exp->exp_client_uuid),
1207                               obd_export_nid2str(exp));
1208                 mdt_export_evict(exp);
1209                 EXIT;
1210                 return;
1211         }
1212
1213         body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1214         mti->mti_attr.ma_need = MA_INODE;
1215         mti->mti_attr.ma_valid = 0;
1216         rc = mo_attr_get(mti->mti_env, mdt_object_child(child), &mti->mti_attr);
1217         if (rc == -EREMOTE) {
1218                 /* object was created on remote server */
1219                 req->rq_status = rc;
1220                 body->valid |= OBD_MD_MDS;
1221         }
1222         mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
1223                            mdt_object_fid(child));
1224         mdt_object_put(mti->mti_env, child);
1225 }
1226
1227 static void mdt_reconstruct_setattr(struct mdt_thread_info *mti,
1228                                     struct mdt_lock_handle *lhc)
1229 {
1230         struct ptlrpc_request  *req = mdt_info_req(mti);
1231         struct obd_export *exp = req->rq_export;
1232         struct mdt_export_data *med = &exp->exp_mdt_data;
1233         struct mdt_device *mdt = mti->mti_mdt;
1234         struct mdt_object *obj;
1235         struct mdt_body *body;
1236
1237         mdt_req_from_lcd(req, med->med_lcd);
1238         if (req->rq_status)
1239                 return;
1240
1241         body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1242         obj = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid1);
1243         if (IS_ERR(obj)) {
1244                 int rc = PTR_ERR(obj);
1245                 LCONSOLE_WARN(""DFID" lookup error %d."
1246                               " Evicting client %s with export %s.\n",
1247                               PFID(mdt_object_fid(obj)), rc,
1248                               obd_uuid2str(&exp->exp_client_uuid),
1249                               obd_export_nid2str(exp));
1250                 mdt_export_evict(exp);
1251                 EXIT;
1252                 return;
1253         }
1254         mti->mti_attr.ma_need = MA_INODE;
1255         mti->mti_attr.ma_valid = 0;
1256         mo_attr_get(mti->mti_env, mdt_object_child(obj), &mti->mti_attr);
1257         mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
1258                            mdt_object_fid(obj));
1259         if (mti->mti_epoch && (mti->mti_epoch->flags & MF_EPOCH_OPEN)) {
1260                 struct mdt_file_data *mfd;
1261                 struct mdt_body *repbody;
1262
1263                 repbody = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1264                 repbody->ioepoch = obj->mot_ioepoch;
1265                 spin_lock(&med->med_open_lock);
1266                 list_for_each_entry(mfd, &med->med_open_head, mfd_list) {
1267                         if (mfd->mfd_xid == req->rq_xid)
1268                                 break;
1269                 }
1270                 LASSERT(&mfd->mfd_list != &med->med_open_head);
1271                 spin_unlock(&med->med_open_lock);
1272                 repbody->handle.cookie = mfd->mfd_handle.h_cookie;
1273         }
1274
1275         mdt_object_put(mti->mti_env, obj);
1276 }
1277
1278 typedef void (*mdt_reconstructor)(struct mdt_thread_info *mti,
1279                                   struct mdt_lock_handle *lhc);
1280
1281 static mdt_reconstructor reconstructors[REINT_MAX] = {
1282         [REINT_SETATTR]  = mdt_reconstruct_setattr,
1283         [REINT_CREATE]   = mdt_reconstruct_create,
1284         [REINT_LINK]     = mdt_reconstruct_generic,
1285         [REINT_UNLINK]   = mdt_reconstruct_generic,
1286         [REINT_RENAME]   = mdt_reconstruct_generic,
1287         [REINT_OPEN]     = mdt_reconstruct_open,
1288         [REINT_SETXATTR] = mdt_reconstruct_generic
1289 };
1290
1291 void mdt_reconstruct(struct mdt_thread_info *mti,
1292                      struct mdt_lock_handle *lhc)
1293 {
1294         ENTRY;
1295         reconstructors[mti->mti_rr.rr_opcode](mti, lhc);
1296         EXIT;
1297 }