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 #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
  54 struct lu_buf *mdt_buf(const struct lu_env *env, void *area, ssize_t len)
  55 {
  56         struct lu_buf *buf;
  57         struct mdt_thread_info *mti;
  58
  59         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
  60         buf = &mti->mti_buf;
  61         buf->lb_buf = area;
  62         buf->lb_len = len;
  63         return buf;
  64 }
  65
  66 const struct lu_buf *mdt_buf_const(const struct lu_env *env,
  67                                    const void *area, ssize_t len)
  68 {
  69         struct lu_buf *buf;
  70         struct mdt_thread_info *mti;
  71
  72         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
  73         buf = &mti->mti_buf;
  74
  75         buf->lb_buf = (void *)area;
  76         buf->lb_len = len;
  77         return buf;
  78 }
  79
  80 struct thandle *mdt_trans_create(const struct lu_env *env,
  81                                  struct mdt_device *mdt)
  82 {
  83         return mdt->mdt_bottom->dd_ops->dt_trans_create(env, mdt->mdt_bottom);
  84 }
  85
  86 int mdt_trans_start(const struct lu_env *env, struct mdt_device *mdt,
  87                     struct thandle *th)
  88 {
  89         return dt_trans_start(env, mdt->mdt_bottom, th);
  90 }
  91
  92 void mdt_trans_stop(const struct lu_env *env,
  93                     struct mdt_device *mdt, struct thandle *th)
  94 {
  95         struct mdt_thread_info *mti;
  96
  97         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
  98         /* export can require sync operations */
  99         if (mti->mti_exp != NULL)
 100                 th->th_sync |= mti->mti_exp->exp_need_sync;
 101         dt_trans_stop(env, mdt->mdt_bottom, th);
 102 }
 103
 104 static inline int mdt_last_rcvd_header_read(const struct lu_env *env,
 105                                             struct mdt_device *mdt)
 106 {
 107         struct mdt_thread_info *mti;
 108         int rc;
 109
 110         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 111
 112         mti->mti_off = 0;
 113         rc = dt_record_read(env, mdt->mdt_lut.lut_last_rcvd,
 114                             mdt_buf(env, &mti->mti_lsd, sizeof(mti->mti_lsd)),
 115                             &mti->mti_off);
 116         if (rc == 0)
 117                 lsd_le_to_cpu(&mti->mti_lsd, &mdt->mdt_lut.lut_lsd);
 118
 119         CDEBUG(D_INFO, "read last_rcvd header rc = %d, uuid = %s, "
 120                "last_transno = "LPU64"\n", rc, mdt->mdt_lut.lut_lsd.lsd_uuid,
 121                mdt->mdt_lut.lut_lsd.lsd_last_transno);
 122         return rc;
 123 }
 124
 125 static int mdt_declare_last_rcvd_header_write(const struct lu_env *env,
 126                                               struct mdt_device *mdt,
 127                                               struct thandle *th)
 128 {
 129         struct mdt_thread_info *mti;
 130
 131         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 132
 133         return dt_declare_record_write(env, mdt->mdt_lut.lut_last_rcvd,
 134                                        sizeof(mti->mti_lsd), 0, th);
 135 }
 136
 137 static int mdt_last_rcvd_header_write(const struct lu_env *env,
 138                                       struct mdt_device *mdt,
 139                                       struct thandle *th)
 140 {
 141         struct mdt_thread_info *mti;
 142         int rc;
 143         ENTRY;
 144
 145         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 146
 147         mti->mti_off = 0;
 148         lsd_cpu_to_le(&mdt->mdt_lut.lut_lsd, &mti->mti_lsd);
 149
 150         rc = dt_record_write(env, mdt->mdt_lut.lut_last_rcvd,
 151                              mdt_buf_const(env, &mti->mti_lsd,
 152                                            sizeof(mti->mti_lsd)),
 153                              &mti->mti_off, th);
 154
 155         CDEBUG(D_INFO, "write last_rcvd header rc = %d, uuid = %s, "
 156                "last_transno = "LPU64"\n", rc, mdt->mdt_lut.lut_lsd.lsd_uuid,
 157                mdt->mdt_lut.lut_lsd.lsd_last_transno);
 158
 159         RETURN(rc);
 160 }
 161
 162 static int mdt_last_rcvd_read(const struct lu_env *env, struct mdt_device *mdt,
 163                               struct lsd_client_data *lcd, loff_t *off,
 164                               int index)
 165 {
 166         struct mdt_thread_info *mti;
 167         struct lsd_client_data *tmp;
 168         int rc;
 169
 170         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 171         tmp = &mti->mti_lcd;
 172         rc = dt_record_read(env, mdt->mdt_lut.lut_last_rcvd,
 173                             mdt_buf(env, tmp, sizeof(*tmp)), off);
 174         if (rc == 0) {
 175                 check_lcd(mdt2obd_dev(mdt)->obd_name, index, tmp);
 176                 lcd_le_to_cpu(tmp, lcd);
 177         }
 178
 179         CDEBUG(D_INFO, "read lcd @%d rc = %d, uuid = %s, last_transno = "LPU64
 180                ", last_xid = "LPU64", last_result = %u, last_data = %u, "
 181                "last_close_transno = "LPU64", last_close_xid = "LPU64", "
 182                "last_close_result = %u\n", (int)(*off - sizeof(*tmp)),
 183                rc, lcd->lcd_uuid, lcd->lcd_last_transno, lcd->lcd_last_xid,
 184                lcd->lcd_last_result, lcd->lcd_last_data,
 185                lcd->lcd_last_close_transno, lcd->lcd_last_close_xid,
 186                lcd->lcd_last_close_result);
 187         return rc;
 188 }
 189
 190 static int mdt_declare_last_rcvd_write(const struct lu_env *env,
 191                                        struct mdt_device *mdt,
 192                                        loff_t off, struct thandle *th)
 193 {
 194         return dt_declare_record_write(env, mdt->mdt_lut.lut_last_rcvd,
 195                                        sizeof(struct lsd_client_data), off, th);
 196 }
 197
 198 static int mdt_last_rcvd_write(const struct lu_env *env,
 199                                struct mdt_device *mdt,
 200                                struct lsd_client_data *lcd,
 201                                loff_t *off, struct thandle *th)
 202 {
 203         struct mdt_thread_info *mti;
 204         struct lsd_client_data *tmp;
 205         int rc;
 206
 207         LASSERT(th != NULL);
 208         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 209         tmp = &mti->mti_lcd;
 210
 211         lcd_cpu_to_le(lcd, tmp);
 212
 213         rc = dt_record_write(env, mdt->mdt_lut.lut_last_rcvd,
 214                              mdt_buf_const(env, tmp, sizeof(*tmp)), off, th);
 215
 216         CDEBUG(D_INFO, "write lcd @%d rc = %d, uuid = %s, last_transno = "LPU64
 217                ", last_xid = "LPU64", last_result = %u, last_data = %u, "
 218                "last_close_transno = "LPU64", last_close_xid = "LPU64" ,"
 219                "last_close_result = %u\n", (int)(*off - sizeof(*tmp)),
 220                rc, lcd->lcd_uuid, lcd->lcd_last_transno, lcd->lcd_last_xid,
 221                lcd->lcd_last_result, lcd->lcd_last_data,
 222                lcd->lcd_last_close_transno, lcd->lcd_last_close_xid,
 223                lcd->lcd_last_close_result);
 224         return rc;
 225 }
 226
 227 static int mdt_clients_data_init(const struct lu_env *env,
 228                                  struct mdt_device *mdt,
 229                                  unsigned long last_size)
 230 {
 231         struct lr_server_data  *lsd = &mdt->mdt_lut.lut_lsd;
 232         struct lsd_client_data *lcd;
 233         struct obd_device      *obd = mdt2obd_dev(mdt);
 234         loff_t off;
 235         int cl_idx;
 236         int rc = 0;
 237         ENTRY;
 238
 239         OBD_ALLOC_PTR(lcd);
 240         if (!lcd)
 241                 RETURN(-ENOMEM);
 242
 243         /* When we do a clean MDS shutdown, we save the last_transno into
 244          * the header.  If we find clients with higher last_transno values
 245          * then those clients may need recovery done. */
 246         LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients) == 0);
 247         for (cl_idx = 0, off = lsd->lsd_client_start;
 248              off < last_size; cl_idx++) {
 249                 __u64 last_transno;
 250                 struct obd_export *exp;
 251                 struct mdt_thread_info *mti;
 252
 253                 off = lsd->lsd_client_start +
 254                         cl_idx * lsd->lsd_client_size;
 255
 256                 rc = mdt_last_rcvd_read(env, mdt, lcd, &off, cl_idx);
 257                 if (rc) {
 258                         CERROR("error reading MDS %s idx %d, off %llu: rc %d\n",
 259                                LAST_RCVD, cl_idx, off, rc);
 260                         rc = 0;
 261                         break; /* read error shouldn't cause startup to fail */
 262                 }
 263
 264                 if (lcd->lcd_uuid[0] == '\0') {
 265                         CDEBUG(D_INFO, "skipping zeroed client at offset %d\n",
 266                                cl_idx);
 267                         continue;
 268                 }
 269
 270                 last_transno = lcd_last_transno(lcd);
 271
 272                 /* These exports are cleaned up by mdt_obd_disconnect(), so
 273                  * they need to be set up like real exports as
 274                  * mdt_obd_connect() does.
 275                  */
 276                 CDEBUG(D_HA, "RCVRNG CLIENT uuid: %s idx: %d lr: "LPU64
 277                        " srv lr: "LPU64" lx: "LPU64"\n", lcd->lcd_uuid, cl_idx,
 278                        last_transno, lsd->lsd_last_transno,
 279                        lcd_last_xid(lcd));
 280
 281                 exp = class_new_export(obd, (struct obd_uuid *)lcd->lcd_uuid);
 282                 if (IS_ERR(exp)) {
 283                         if (PTR_ERR(exp) == -EALREADY) {
 284                                 /* export already exists, zero out this one */
 285                                 CERROR("Duplicate export %s!\n", lcd->lcd_uuid);
 286                                 continue;
 287                         }
 288                         GOTO(err_client, rc = PTR_ERR(exp));
 289                 }
 290
 291                 mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 292                 LASSERT(mti != NULL);
 293                 mti->mti_exp = exp;
 294                 /* copy on-disk lcd to the export */
 295                 *exp->exp_target_data.ted_lcd = *lcd;
 296                 rc = mdt_client_add(env, mdt, cl_idx);
 297                 /* can't fail existing */
 298                 LASSERTF(rc == 0, "rc = %d\n", rc);
 299                 /* VBR: set export last committed version */
 300                 exp->exp_last_committed = last_transno;
 301                 cfs_spin_lock(&exp->exp_lock);
 302                 exp->exp_connecting = 0;
 303                 exp->exp_in_recovery = 0;
 304                 cfs_spin_unlock(&exp->exp_lock);
 305                 obd->obd_max_recoverable_clients++;
 306                 class_export_put(exp);
 307
 308                 CDEBUG(D_OTHER, "client at idx %d has last_transno="LPU64"\n",
 309                        cl_idx, last_transno);
 310                 /* protect __u64 value update */
 311                 cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 312                 mdt->mdt_lut.lut_last_transno = max(last_transno,
 313                                                 mdt->mdt_lut.lut_last_transno);
 314                 cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 315         }
 316
 317 err_client:
 318         OBD_FREE_PTR(lcd);
 319         RETURN(rc);
 320 }
 321
 322 static int mdt_server_data_init(const struct lu_env *env,
 323                                 struct mdt_device *mdt,
 324                                 struct lustre_sb_info *lsi)
 325 {
 326         struct lr_server_data  *lsd = &mdt->mdt_lut.lut_lsd;
 327         struct lsd_client_data *lcd = NULL;
 328         struct obd_device      *obd = mdt2obd_dev(mdt);
 329         struct mdt_thread_info *mti;
 330         struct dt_object       *obj;
 331         struct lu_attr         *la;
 332         struct lustre_disk_data  *ldd;
 333         unsigned long last_rcvd_size;
 334         __u64 mount_count;
 335         int rc;
 336         ENTRY;
 337
 338         /* ensure padding in the struct is the correct size */
 339         CLASSERT(offsetof(struct lr_server_data, lsd_padding) +
 340                 sizeof(lsd->lsd_padding) == LR_SERVER_SIZE);
 341         CLASSERT(offsetof(struct lsd_client_data, lcd_padding) +
 342                 sizeof(lcd->lcd_padding) == LR_CLIENT_SIZE);
 343
 344         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 345         LASSERT(mti != NULL);
 346         la = &mti->mti_attr.ma_attr;
 347
 348         obj = mdt->mdt_lut.lut_last_rcvd;
 349         rc = obj->do_ops->do_attr_get(env, obj, la, BYPASS_CAPA);
 350         if (rc)
 351                 RETURN(rc);
 352
 353         last_rcvd_size = (unsigned long)la->la_size;
 354
 355         if (last_rcvd_size == 0) {
 356                 LCONSOLE_WARN("%s: new disk, initializing\n", obd->obd_name);
 357
 358                 memcpy(lsd->lsd_uuid, obd->obd_uuid.uuid,
 359                        sizeof(lsd->lsd_uuid));
 360                 lsd->lsd_last_transno = 0;
 361                 lsd->lsd_mount_count = 0;
 362                 lsd->lsd_server_size = LR_SERVER_SIZE;
 363                 lsd->lsd_client_start = LR_CLIENT_START;
 364                 lsd->lsd_client_size = LR_CLIENT_SIZE;
 365                 lsd->lsd_feature_compat = OBD_COMPAT_MDT;
 366                 lsd->lsd_feature_rocompat = OBD_ROCOMPAT_LOVOBJID;
 367                 lsd->lsd_feature_incompat = OBD_INCOMPAT_MDT |
 368                                             OBD_INCOMPAT_COMMON_LR |
 369                                             OBD_INCOMPAT_MULTI_OI;
 370         } else {
 371                 LCONSOLE_WARN("%s: used disk, loading\n", obd->obd_name);
 372                 rc = mdt_last_rcvd_header_read(env, mdt);
 373                 if (rc) {
 374                         CERROR("error reading MDS %s: rc %d\n", LAST_RCVD, rc);
 375                         GOTO(out, rc);
 376                 }
 377                 if (strcmp(lsd->lsd_uuid, obd->obd_uuid.uuid) != 0) {
 378                         LCONSOLE_ERROR_MSG(0x157, "Trying to start OBD %s using"
 379                                            "the wrong disk %s. Were the /dev/ "
 380                                            "assignments rearranged?\n",
 381                                            obd->obd_uuid.uuid, lsd->lsd_uuid);
 382                         GOTO(out, rc = -EINVAL);
 383                 }
 384                 lsd->lsd_feature_compat |= OBD_COMPAT_MDT;
 385                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_MDT |
 386                                              OBD_INCOMPAT_COMMON_LR;
 387         }
 388         mount_count = lsd->lsd_mount_count;
 389
 390         ldd = lsi->lsi_ldd;
 391
 392         if (lsd->lsd_feature_incompat & ~MDT_INCOMPAT_SUPP) {
 393                 CERROR("%s: unsupported incompat filesystem feature(s) %x\n",
 394                        obd->obd_name,
 395                        lsd->lsd_feature_incompat & ~MDT_INCOMPAT_SUPP);
 396                 GOTO(out, rc = -EINVAL);
 397         }
 398         if (lsd->lsd_feature_rocompat & ~MDT_ROCOMPAT_SUPP) {
 399                 CERROR("%s: unsupported read-only filesystem feature(s) %x\n",
 400                        obd->obd_name,
 401                        lsd->lsd_feature_rocompat & ~MDT_ROCOMPAT_SUPP);
 402                 /* XXX: Do something like remount filesystem read-only */
 403                 GOTO(out, rc = -EINVAL);
 404         }
 405         /** Interop: evict all clients at first boot with 1.8 last_rcvd */
 406         if (!(lsd->lsd_feature_compat & OBD_COMPAT_20)) {
 407                 if (last_rcvd_size > lsd->lsd_client_start) {
 408                         LCONSOLE_WARN("Mounting %s at first time on 1.8 FS, "
 409                                       "remove all clients for interop needs\n",
 410                                       obd->obd_name);
 411                         simple_truncate(lsi->lsi_srv_mnt->mnt_sb->s_root,
 412                                         lsi->lsi_srv_mnt, LAST_RCVD,
 413                                         lsd->lsd_client_start);
 414                         last_rcvd_size = lsd->lsd_client_start;
 415                 }
 416                 /** set 2.0 flag to upgrade/downgrade between 1.8 and 2.0 */
 417                 lsd->lsd_feature_compat |= OBD_COMPAT_20;
 418         }
 419
 420         if (ldd->ldd_flags & LDD_F_IAM_DIR)
 421                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_IAM_DIR;
 422
 423         lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
 424
 425         cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 426         mdt->mdt_lut.lut_last_transno = lsd->lsd_last_transno;
 427         cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 428
 429         CDEBUG(D_INODE, "========BEGIN DUMPING LAST_RCVD========\n");
 430         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
 431                obd->obd_name, mdt->mdt_lut.lut_last_transno);
 432         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
 433                obd->obd_name, mount_count + 1);
 434         CDEBUG(D_INODE, "%s: server data size: %u\n",
 435                obd->obd_name, lsd->lsd_server_size);
 436         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
 437                obd->obd_name, lsd->lsd_client_start);
 438         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
 439                obd->obd_name, lsd->lsd_client_size);
 440         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
 441                obd->obd_name, last_rcvd_size);
 442         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", obd->obd_name,
 443                last_rcvd_size <= lsd->lsd_client_start ? 0 :
 444                (last_rcvd_size - lsd->lsd_client_start) /
 445                 lsd->lsd_client_size);
 446         CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
 447
 448         if (!lsd->lsd_server_size || !lsd->lsd_client_start ||
 449             !lsd->lsd_client_size) {
 450                 CERROR("Bad last_rcvd contents!\n");
 451                 GOTO(out, rc = -EINVAL);
 452         }
 453
 454         rc = mdt_clients_data_init(env, mdt, last_rcvd_size);
 455         if (rc)
 456                 GOTO(err_client, rc);
 457
 458         cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 459         /* obd_last_committed is used for compatibility
 460          * with other lustre recovery code */
 461         obd->obd_last_committed = mdt->mdt_lut.lut_last_transno;
 462         cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 463
 464         obd->u.obt.obt_mount_count = mount_count + 1;
 465         obd->u.obt.obt_instance = (__u32)obd->u.obt.obt_mount_count;
 466         lsd->lsd_mount_count = obd->u.obt.obt_mount_count;
 467
 468         /* save it, so mount count and last_transno is current */
 469         rc = mdt_server_data_update(env, mdt);
 470         if (rc)
 471                 GOTO(err_client, rc);
 472
 473         RETURN(0);
 474
 475 err_client:
 476         class_disconnect_exports(obd);
 477 out:
 478         return rc;
 479 }
 480
 481 static int mdt_server_data_update(const struct lu_env *env,
 482                                   struct mdt_device *mdt)
 483 {
 484         struct mdt_thread_info *mti;
 485         struct thandle *th;
 486         int rc;
 487
 488         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 489
 490         th = mdt_trans_create(env, mdt);
 491         if (IS_ERR(th))
 492                 RETURN(PTR_ERR(th));
 493
 494         rc = mdt_declare_last_rcvd_header_write(env, mdt, th);
 495         if (rc)
 496                 goto out;
 497
 498         rc = mdt_trans_start(env, mdt, th);
 499         if (rc)
 500                 goto out;
 501
 502         CDEBUG(D_SUPER, "MDS mount_count is "LPU64", last_transno is "LPU64"\n",
 503                mdt->mdt_lut.lut_obd->u.obt.obt_mount_count,
 504                mdt->mdt_lut.lut_last_transno);
 505
 506         cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 507         mdt->mdt_lut.lut_lsd.lsd_last_transno = mdt->mdt_lut.lut_last_transno;
 508         cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 509
 510         rc = mdt_last_rcvd_header_write(env, mdt, th);
 511
 512 out:
 513         mdt_trans_stop(env, mdt, th);
 514         return rc;
 515 }
 516
 517
 518 int mdt_client_new(const struct lu_env *env, struct mdt_device *mdt)
 519 {
 520         unsigned long *bitmap = mdt->mdt_lut.lut_client_bitmap;
 521         struct mdt_thread_info *mti;
 522         struct tg_export_data *ted;
 523         struct lr_server_data  *lsd = &mdt->mdt_lut.lut_lsd;
 524         struct obd_device *obd = mdt2obd_dev(mdt);
 525         struct thandle *th;
 526         loff_t off;
 527         int rc;
 528         int cl_idx;
 529         ENTRY;
 530
 531         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 532         LASSERT(mti != NULL);
 533
 534         ted = &mti->mti_exp->exp_target_data;
 535
 536         LASSERT(bitmap != NULL);
 537         if (!strcmp(ted->ted_lcd->lcd_uuid, obd->obd_uuid.uuid))
 538                 RETURN(0);
 539
 540         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 541          * there's no need for extra complication here
 542          */
 543         cfs_spin_lock(&mdt->mdt_lut.lut_client_bitmap_lock);
 544         cl_idx = cfs_find_first_zero_bit(bitmap, LR_MAX_CLIENTS);
 545         if (cl_idx >= LR_MAX_CLIENTS ||
 546             OBD_FAIL_CHECK(OBD_FAIL_MDS_CLIENT_ADD)) {
 547                 CERROR("no room for %u clients - fix LR_MAX_CLIENTS\n",
 548                        cl_idx);
 549                 cfs_spin_unlock(&mdt->mdt_lut.lut_client_bitmap_lock);
 550                 RETURN(-EOVERFLOW);
 551         }
 552         cfs_set_bit(cl_idx, bitmap);
 553         cfs_spin_unlock(&mdt->mdt_lut.lut_client_bitmap_lock);
 554
 555         CDEBUG(D_INFO, "client at idx %d with UUID '%s' added\n",
 556                cl_idx, ted->ted_lcd->lcd_uuid);
 557
 558         ted->ted_lr_idx = cl_idx;
 559         ted->ted_lr_off = lsd->lsd_client_start +
 560                           (cl_idx * lsd->lsd_client_size);
 561         cfs_mutex_init(&ted->ted_lcd_lock);
 562
 563         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 564
 565         /* Write new client data. */
 566         off = ted->ted_lr_off;
 567
 568         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_CLIENT_ADD))
 569                 RETURN(-ENOSPC);
 570
 571         th = mdt_trans_create(env, mdt);
 572         if (IS_ERR(th))
 573                 RETURN(PTR_ERR(th));
 574
 575         rc = mdt_declare_last_rcvd_write(env, mdt, off, th);
 576         if (rc)
 577                 GOTO(stop, rc);
 578
 579         rc = mdt_trans_start(env, mdt, th);
 580         if (rc)
 581                 GOTO(stop, rc);
 582
 583         /*
 584          * Until this operations will be committed the sync is needed
 585          * for this export. This should be done _after_ starting the
 586          * transaction so that many connecting clients will not bring
 587          * server down with lots of sync writes.
 588          */
 589         rc = lut_new_client_cb_add(th, mti->mti_exp);
 590         if (rc) {
 591                 /* can't add callback, do sync now */
 592                 th->th_sync = 1;
 593         } else {
 594                 cfs_spin_lock(&mti->mti_exp->exp_lock);
 595                 mti->mti_exp->exp_need_sync = 1;
 596                 cfs_spin_unlock(&mti->mti_exp->exp_lock);
 597         }
 598
 599         rc = mdt_last_rcvd_write(env, mdt, ted->ted_lcd, &off, th);
 600         CDEBUG(D_INFO, "wrote client lcd at idx %u off %llu (len %u)\n",
 601                cl_idx, ted->ted_lr_off, (int)sizeof(*(ted->ted_lcd)));
 602
 603 stop:
 604         mdt_trans_stop(env, mdt, th);
 605
 606         RETURN(rc);
 607 }
 608
 609 /* Add client data to the MDS.  We use a bitmap to locate a free space
 610  * in the last_rcvd file if cl_off is -1 (i.e. a new client).
 611  * Otherwise, we just have to read the data from the last_rcvd file and
 612  * we know its offset.
 613  *
 614  * It should not be possible to fail adding an existing client - otherwise
 615  * mdt_init_server_data() callsite needs to be fixed.
 616  */
 617 int mdt_client_add(const struct lu_env *env,
 618                    struct mdt_device *mdt, int cl_idx)
 619 {
 620         struct mdt_thread_info *mti;
 621         struct tg_export_data  *ted;
 622         unsigned long *bitmap = mdt->mdt_lut.lut_client_bitmap;
 623         struct obd_device *obd = mdt2obd_dev(mdt);
 624         struct lr_server_data *lsd = &mdt->mdt_lut.lut_lsd;
 625         int rc = 0;
 626         ENTRY;
 627
 628         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 629         LASSERT(mti != NULL);
 630
 631         ted = &mti->mti_exp->exp_target_data;
 632
 633         LASSERT(bitmap != NULL);
 634         LASSERTF(cl_idx >= 0, "%d\n", cl_idx);
 635
 636         if (!strcmp(ted->ted_lcd->lcd_uuid, obd->obd_uuid.uuid))
 637                 RETURN(0);
 638
 639         cfs_spin_lock(&mdt->mdt_lut.lut_client_bitmap_lock);
 640         if (cfs_test_and_set_bit(cl_idx, bitmap)) {
 641                 CERROR("MDS client %d: bit already set in bitmap!!\n",
 642                        cl_idx);
 643                 LBUG();
 644         }
 645         cfs_spin_unlock(&mdt->mdt_lut.lut_client_bitmap_lock);
 646
 647         CDEBUG(D_INFO, "client at idx %d with UUID '%s' added\n",
 648                cl_idx, ted->ted_lcd->lcd_uuid);
 649
 650         ted->ted_lr_idx = cl_idx;
 651         ted->ted_lr_off = lsd->lsd_client_start +
 652                           (cl_idx * lsd->lsd_client_size);
 653         cfs_mutex_init(&ted->ted_lcd_lock);
 654
 655         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 656
 657         RETURN(rc);
 658 }
 659
 660 int mdt_client_del(const struct lu_env *env, struct mdt_device *mdt)
 661 {
 662         struct mdt_thread_info *mti;
 663         struct tg_export_data  *ted;
 664         struct obd_device      *obd = mdt2obd_dev(mdt);
 665         struct obd_export      *exp;
 666         struct thandle         *th;
 667         loff_t                  off;
 668         int                     rc = 0;
 669         ENTRY;
 670
 671         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 672         LASSERT(mti != NULL);
 673
 674         exp = mti->mti_exp;
 675         ted = &exp->exp_target_data;
 676         if (!ted->ted_lcd)
 677                 RETURN(0);
 678
 679         /* XXX: If lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 680         if (!strcmp(ted->ted_lcd->lcd_uuid, obd->obd_uuid.uuid))
 681                 GOTO(free, 0);
 682
 683         CDEBUG(D_INFO, "freeing client at idx %u, offset %lld\n",
 684                ted->ted_lr_idx, ted->ted_lr_off);
 685
 686         off = ted->ted_lr_off;
 687
 688         /*
 689          * Don't clear ted_lr_idx here as it is likely also unset.  At worst we
 690          * leak a client slot that will be cleaned on the next recovery.
 691          */
 692         if (off <= 0) {
 693                 CERROR("client idx %d has offset %lld\n",
 694                         ted->ted_lr_idx, off);
 695                 GOTO(free, rc = -EINVAL);
 696         }
 697
 698         /*
 699          * Clear the bit _after_ zeroing out the client so we don't race with
 700          * mdt_client_add and zero out new clients.
 701          */
 702         if (!cfs_test_bit(ted->ted_lr_idx, mdt->mdt_lut.lut_client_bitmap)) {
 703                 CERROR("MDT client %u: bit already clear in bitmap!!\n",
 704                        ted->ted_lr_idx);
 705                 LBUG();
 706         }
 707
 708         /* Make sure the server's last_transno is up to date.
 709          * This should be done before zeroing client slot so last_transno will
 710          * be in server data or in client data in case of failure */
 711         mdt_server_data_update(env, mdt);
 712
 713         th = mdt_trans_create(env, mdt);
 714         if (IS_ERR(th))
 715                 GOTO(free, rc = PTR_ERR(th));
 716
 717         rc = mdt_declare_last_rcvd_write(env, mdt, off, th);
 718         if (rc)
 719                 GOTO(stop, rc);
 720
 721         rc = mdt_trans_start(env, mdt, th);
 722         if (rc)
 723                 GOTO(stop, rc);
 724
 725         cfs_mutex_lock(&ted->ted_lcd_lock);
 726         memset(ted->ted_lcd->lcd_uuid, 0, sizeof ted->ted_lcd->lcd_uuid);
 727         rc = mdt_last_rcvd_write(env, mdt, ted->ted_lcd, &off, th);
 728         cfs_mutex_unlock(&ted->ted_lcd_lock);
 729
 730 stop:
 731         mdt_trans_stop(env, mdt, th);
 732
 733         CDEBUG(rc == 0 ? D_INFO : D_ERROR, "Zeroing out client idx %u in "
 734                "%s, rc %d\n",  ted->ted_lr_idx, LAST_RCVD, rc);
 735         RETURN(0);
 736 free:
 737         return 0;
 738 }
 739
 740 /*
 741  * last_rcvd & last_committed update callbacks
 742  */
 743 static int mdt_last_rcvd_update(struct mdt_thread_info *mti,
 744                                 struct thandle *th)
 745 {
 746         struct mdt_device *mdt = mti->mti_mdt;
 747         struct ptlrpc_request *req = mdt_info_req(mti);
 748         struct tg_export_data *ted;
 749         struct lsd_client_data *lcd;
 750         loff_t off;
 751         int err;
 752         __s32 rc = th->th_result;
 753
 754         ENTRY;
 755         LASSERT(req);
 756         LASSERT(req->rq_export);
 757         LASSERT(mdt);
 758         ted = &req->rq_export->exp_target_data;
 759         LASSERT(ted);
 760
 761         cfs_mutex_lock(&ted->ted_lcd_lock);
 762         lcd = ted->ted_lcd;
 763         /* if the export has already been disconnected, we have no last_rcvd slot,
 764          * update server data with latest transno then */
 765         if (lcd == NULL) {
 766                 cfs_mutex_unlock(&ted->ted_lcd_lock);
 767                 CWARN("commit transaction for disconnected client %s: rc %d\n",
 768                       req->rq_export->exp_client_uuid.uuid, rc);
 769                 err = mdt_last_rcvd_header_write(mti->mti_env, mdt, th);
 770                 RETURN(err);
 771         }
 772
 773         off = ted->ted_lr_off;
 774         LASSERT(ergo(mti->mti_transno == 0, rc != 0));
 775         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
 776             lustre_msg_get_opc(req->rq_reqmsg) == MDS_DONE_WRITING) {
 777                 if (mti->mti_transno != 0) {
 778                         if (lcd->lcd_last_close_transno > mti->mti_transno) {
 779                                 CERROR("Trying to overwrite bigger transno:"
 780                                        "on-disk: "LPU64", new: "LPU64" "
 781                                        "replay: %d. see LU-617.\n",
 782                                        lcd->lcd_last_close_transno,
 783                                        mti->mti_transno, req_is_replay(req));
 784                                 if (req_is_replay(req)) {
 785                                         cfs_spin_lock(&req->rq_export->exp_lock);
 786                                         req->rq_export->exp_vbr_failed = 1;
 787                                         cfs_spin_unlock(&req->rq_export->exp_lock);
 788                                 }
 789                                 cfs_mutex_unlock(&ted->ted_lcd_lock);
 790                                 RETURN(req_is_replay(req) ? -EOVERFLOW : 0);
 791                         }
 792                         lcd->lcd_last_close_transno = mti->mti_transno;
 793                 }
 794                 lcd->lcd_last_close_xid = req->rq_xid;
 795                 lcd->lcd_last_close_result = rc;
 796         } else {
 797                 /* VBR: save versions in last_rcvd for reconstruct. */
 798                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
 799                 if (pre_versions) {
 800                         lcd->lcd_pre_versions[0] = pre_versions[0];
 801                         lcd->lcd_pre_versions[1] = pre_versions[1];
 802                         lcd->lcd_pre_versions[2] = pre_versions[2];
 803                         lcd->lcd_pre_versions[3] = pre_versions[3];
 804                 }
 805                 if (mti->mti_transno != 0) {
 806                         if (lcd->lcd_last_transno > mti->mti_transno) {
 807                                 CERROR("Trying to overwrite bigger transno:"
 808                                        "on-disk: "LPU64", new: "LPU64" "
 809                                        "replay: %d. see LU-617.\n",
 810                                        lcd->lcd_last_transno,
 811                                        mti->mti_transno, req_is_replay(req));
 812                                 if (req_is_replay(req)) {
 813                                         cfs_spin_lock(&req->rq_export->exp_lock);
 814                                         req->rq_export->exp_vbr_failed = 1;
 815                                         cfs_spin_unlock(&req->rq_export->exp_lock);
 816                                 }
 817                                 cfs_mutex_unlock(&ted->ted_lcd_lock);
 818                                 RETURN(req_is_replay(req) ? -EOVERFLOW : 0);
 819                         }
 820                         lcd->lcd_last_transno = mti->mti_transno;
 821                 }
 822                 lcd->lcd_last_xid = req->rq_xid;
 823                 lcd->lcd_last_result = rc;
 824                 /*XXX: save intent_disposition in mdt_thread_info?
 825                  * also there is bug - intent_dispostion is __u64,
 826                  * see struct ldlm_reply->lock_policy_res1; */
 827                 lcd->lcd_last_data = mti->mti_opdata;
 828         }
 829
 830         if (off <= 0) {
 831                 CERROR("client idx %d has offset %lld\n", ted->ted_lr_idx, off);
 832                 err = -EINVAL;
 833         } else {
 834                 err = mdt_last_rcvd_write(mti->mti_env, mdt, lcd, &off, th);
 835         }
 836         cfs_mutex_unlock(&ted->ted_lcd_lock);
 837         RETURN(err);
 838 }
 839
 840 extern struct lu_context_key mdt_thread_key;
 841
 842 /* add credits for last_rcvd update */
 843 static int mdt_txn_start_cb(const struct lu_env *env,
 844                             struct thandle *th, void *cookie)
 845 {
 846         struct mdt_device *mdt = cookie;
 847
 848         /* XXX: later we'll be declaring this at specific offset */
 849         return dt_declare_record_write(env, mdt->mdt_lut.lut_last_rcvd,
 850                                        sizeof(struct lsd_client_data), 0, th);
 851 }
 852
 853 /* Update last_rcvd records with latests transaction data */
 854 static int mdt_txn_stop_cb(const struct lu_env *env,
 855                            struct thandle *txn, void *cookie)
 856 {
 857         struct mdt_device *mdt = cookie;
 858         struct mdt_thread_info *mti;
 859         struct ptlrpc_request *req;
 860
 861         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 862         req = mdt_info_req(mti);
 863
 864         if (mti->mti_mdt == NULL || req == NULL || mti->mti_no_need_trans) {
 865                 mti->mti_no_need_trans = 0;
 866                 return 0;
 867         }
 868
 869         if (mti->mti_has_trans) {
 870                 /* XXX: currently there are allowed cases, but the wrong cases
 871                  * are also possible, so better check is needed here */
 872                 CDEBUG(D_INFO, "More than one transaction "LPU64"\n",
 873                        mti->mti_transno);
 874                 return 0;
 875         }
 876
 877         mti->mti_has_trans = 1;
 878         cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 879         if (txn->th_result != 0) {
 880                 if (mti->mti_transno != 0) {
 881                         CERROR("Replay transno "LPU64" failed: rc %d\n",
 882                                mti->mti_transno, txn->th_result);
 883                 }
 884         } else if (mti->mti_transno == 0) {
 885                 mti->mti_transno = ++ mdt->mdt_lut.lut_last_transno;
 886         } else {
 887                 /* should be replay */
 888                 if (mti->mti_transno > mdt->mdt_lut.lut_last_transno)
 889                         mdt->mdt_lut.lut_last_transno = mti->mti_transno;
 890         }
 891         cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 892         /* sometimes the reply message has not been successfully packed */
 893         LASSERT(req != NULL && req->rq_repmsg != NULL);
 894
 895         /** VBR: set new versions */
 896         if (txn->th_result == 0 && mti->mti_mos != NULL) {
 897                 dt_version_set(env, mdt_obj2dt(mti->mti_mos),
 898                                mti->mti_transno, txn);
 899                 mti->mti_mos = NULL;
 900         }
 901
 902         /* filling reply data */
 903         CDEBUG(D_INODE, "transno = "LPU64", last_committed = "LPU64"\n",
 904                mti->mti_transno, req->rq_export->exp_obd->obd_last_committed);
 905
 906         req->rq_transno = mti->mti_transno;
 907         lustre_msg_set_transno(req->rq_repmsg, mti->mti_transno);
 908         /* if can't add callback, do sync write */
 909         txn->th_sync |= !!lut_last_commit_cb_add(txn, &mdt->mdt_lut,
 910                                                  mti->mti_exp,
 911                                                  mti->mti_transno);
 912         return mdt_last_rcvd_update(mti, txn);
 913 }
 914
 915 int mdt_fs_setup(const struct lu_env *env, struct mdt_device *mdt,
 916                  struct obd_device *obd,
 917                  struct lustre_sb_info *lsi)
 918 {
 919         struct lu_fid fid;
 920         struct dt_object *o;
 921         int rc = 0;
 922         ENTRY;
 923
 924         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_FS_SETUP))
 925                 RETURN(-ENOENT);
 926
 927         /* prepare transactions callbacks */
 928         mdt->mdt_txn_cb.dtc_txn_start = mdt_txn_start_cb;
 929         mdt->mdt_txn_cb.dtc_txn_stop = mdt_txn_stop_cb;
 930         mdt->mdt_txn_cb.dtc_txn_commit = NULL;
 931         mdt->mdt_txn_cb.dtc_cookie = mdt;
 932         mdt->mdt_txn_cb.dtc_tag = LCT_MD_THREAD;
 933         CFS_INIT_LIST_HEAD(&mdt->mdt_txn_cb.dtc_linkage);
 934
 935         dt_txn_callback_add(mdt->mdt_bottom, &mdt->mdt_txn_cb);
 936
 937         rc = mdt_server_data_init(env, mdt, lsi);
 938         if (rc)
 939                 RETURN(rc);
 940
 941         o = dt_store_open(env, mdt->mdt_bottom, "", CAPA_KEYS, &fid);
 942         if (!IS_ERR(o)) {
 943                 mdt->mdt_ck_obj = o;
 944                 rc = mdt_capa_keys_init(env, mdt);
 945                 if (rc)
 946                         GOTO(put_ck_object, rc);
 947         } else {
 948                 rc = PTR_ERR(o);
 949                 CERROR("cannot open %s: rc = %d\n", CAPA_KEYS, rc);
 950                 GOTO(disconnect_exports, rc);
 951         }
 952         RETURN(0);
 953
 954 put_ck_object:
 955         lu_object_put(env, &o->do_lu);
 956         mdt->mdt_ck_obj = NULL;
 957 disconnect_exports:
 958         class_disconnect_exports(obd);
 959         return rc;
 960 }
 961
 962 void mdt_fs_cleanup(const struct lu_env *env, struct mdt_device *mdt)
 963 {
 964         ENTRY;
 965
 966         /* Remove transaction callback */
 967         dt_txn_callback_del(mdt->mdt_bottom, &mdt->mdt_txn_cb);
 968         if (mdt->mdt_ck_obj)
 969                 lu_object_put(env, &mdt->mdt_ck_obj->do_lu);
 970         mdt->mdt_ck_obj = NULL;
 971         EXIT;
 972 }
 973
 974 /* reconstruction code */
 975 static void mdt_steal_ack_locks(struct ptlrpc_request *req)
 976 {
 977         struct obd_export         *exp = req->rq_export;
 978         cfs_list_t                *tmp;
 979         struct ptlrpc_reply_state *oldrep;
 980         struct ptlrpc_service     *svc;
 981         int                        i;
 982
 983         /* CAVEAT EMPTOR: spinlock order */
 984         cfs_spin_lock(&exp->exp_lock);
 985         cfs_list_for_each (tmp, &exp->exp_outstanding_replies) {
 986                 oldrep = cfs_list_entry(tmp, struct ptlrpc_reply_state,
 987                                         rs_exp_list);
 988
 989                 if (oldrep->rs_xid != req->rq_xid)
 990                         continue;
 991
 992                 if (oldrep->rs_opc != lustre_msg_get_opc(req->rq_reqmsg))
 993                         CERROR ("Resent req xid "LPU64" has mismatched opc: "
 994                                 "new %d old %d\n", req->rq_xid,
 995                                 lustre_msg_get_opc(req->rq_reqmsg),
 996                                 oldrep->rs_opc);
 997
 998                 svc = oldrep->rs_service;
 999                 cfs_spin_lock (&svc->srv_rs_lock);
1000
1001                 cfs_list_del_init (&oldrep->rs_exp_list);
1002
1003                 CWARN("Stealing %d locks from rs %p x"LPD64".t"LPD64
1004                       " o%d NID %s\n",
1005                       oldrep->rs_nlocks, oldrep,
1006                       oldrep->rs_xid, oldrep->rs_transno, oldrep->rs_opc,
1007                       libcfs_nid2str(exp->exp_connection->c_peer.nid));
1008
1009                 for (i = 0; i < oldrep->rs_nlocks; i++)
1010                         ptlrpc_save_lock(req, &oldrep->rs_locks[i],
1011                                          oldrep->rs_modes[i], 0);
1012                 oldrep->rs_nlocks = 0;
1013
1014                 DEBUG_REQ(D_HA, req, "stole locks for");
1015                 cfs_spin_lock(&oldrep->rs_lock);
1016                 ptlrpc_schedule_difficult_reply (oldrep);
1017                 cfs_spin_unlock(&oldrep->rs_lock);
1018
1019                 cfs_spin_unlock (&svc->srv_rs_lock);
1020                 break;
1021         }
1022         cfs_spin_unlock(&exp->exp_lock);
1023 }
1024
1025 /**
1026  * VBR: restore versions
1027  */
1028 void mdt_vbr_reconstruct(struct ptlrpc_request *req,
1029                          struct lsd_client_data *lcd)
1030 {
1031         __u64 pre_versions[4] = {0};
1032         pre_versions[0] = lcd->lcd_pre_versions[0];
1033         pre_versions[1] = lcd->lcd_pre_versions[1];
1034         pre_versions[2] = lcd->lcd_pre_versions[2];
1035         pre_versions[3] = lcd->lcd_pre_versions[3];
1036         lustre_msg_set_versions(req->rq_repmsg, pre_versions);
1037 }
1038
1039 void mdt_req_from_lcd(struct ptlrpc_request *req,
1040                       struct lsd_client_data *lcd)
1041 {
1042         DEBUG_REQ(D_HA, req, "restoring transno "LPD64"/status %d",
1043                   lcd->lcd_last_transno, lcd->lcd_last_result);
1044
1045         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
1046             lustre_msg_get_opc(req->rq_repmsg) == MDS_DONE_WRITING) {
1047                 req->rq_transno = lcd->lcd_last_close_transno;
1048                 req->rq_status = lcd->lcd_last_close_result;
1049         } else {
1050                 req->rq_transno = lcd->lcd_last_transno;
1051                 req->rq_status = lcd->lcd_last_result;
1052                 mdt_vbr_reconstruct(req, lcd);
1053         }
1054         if (req->rq_status != 0)
1055                 req->rq_transno = 0;
1056         lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
1057         lustre_msg_set_status(req->rq_repmsg, req->rq_status);
1058         DEBUG_REQ(D_RPCTRACE, req, "restoring transno "LPD64"/status %d",
1059                   req->rq_transno, req->rq_status);
1060
1061         mdt_steal_ack_locks(req);
1062 }
1063
1064 void mdt_reconstruct_generic(struct mdt_thread_info *mti,
1065                              struct mdt_lock_handle *lhc)
1066 {
1067         struct ptlrpc_request *req = mdt_info_req(mti);
1068         struct tg_export_data *ted = &req->rq_export->exp_target_data;
1069
1070         return mdt_req_from_lcd(req, ted->ted_lcd);
1071 }
1072
1073 static void mdt_reconstruct_create(struct mdt_thread_info *mti,
1074                                    struct mdt_lock_handle *lhc)
1075 {
1076         struct ptlrpc_request  *req = mdt_info_req(mti);
1077         struct obd_export *exp = req->rq_export;
1078         struct tg_export_data *ted = &exp->exp_target_data;
1079         struct mdt_device *mdt = mti->mti_mdt;
1080         struct mdt_object *child;
1081         struct mdt_body *body;
1082         int rc;
1083
1084         mdt_req_from_lcd(req, ted->ted_lcd);
1085         if (req->rq_status)
1086                 return;
1087
1088         /* if no error, so child was created with requested fid */
1089         child = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid2);
1090         if (IS_ERR(child)) {
1091                 rc = PTR_ERR(child);
1092                 LCONSOLE_WARN("Child "DFID" lookup error %d."
1093                               " Evicting client %s with export %s.\n",
1094                               PFID(mdt_object_fid(child)), rc,
1095                               obd_uuid2str(&exp->exp_client_uuid),
1096                               obd_export_nid2str(exp));
1097                 mdt_export_evict(exp);
1098                 EXIT;
1099                 return;
1100         }
1101
1102         body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1103         mti->mti_attr.ma_need = MA_INODE;
1104         mti->mti_attr.ma_valid = 0;
1105         rc = mo_attr_get(mti->mti_env, mdt_object_child(child), &mti->mti_attr);
1106         if (rc == -EREMOTE) {
1107                 /* object was created on remote server */
1108                 req->rq_status = rc;
1109                 body->valid |= OBD_MD_MDS;
1110         }
1111         mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
1112                            mdt_object_fid(child));
1113         mdt_object_put(mti->mti_env, child);
1114 }
1115
1116 static void mdt_reconstruct_setattr(struct mdt_thread_info *mti,
1117                                     struct mdt_lock_handle *lhc)
1118 {
1119         struct ptlrpc_request  *req = mdt_info_req(mti);
1120         struct obd_export *exp = req->rq_export;
1121         struct mdt_export_data *med = &exp->exp_mdt_data;
1122         struct mdt_device *mdt = mti->mti_mdt;
1123         struct mdt_object *obj;
1124         struct mdt_body *body;
1125
1126         mdt_req_from_lcd(req, med->med_ted.ted_lcd);
1127         if (req->rq_status)
1128                 return;
1129
1130         body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1131         obj = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid1);
1132         if (IS_ERR(obj)) {
1133                 int rc = PTR_ERR(obj);
1134                 LCONSOLE_WARN(""DFID" lookup error %d."
1135                               " Evicting client %s with export %s.\n",
1136                               PFID(mdt_object_fid(obj)), rc,
1137                               obd_uuid2str(&exp->exp_client_uuid),
1138                               obd_export_nid2str(exp));
1139                 mdt_export_evict(exp);
1140                 EXIT;
1141                 return;
1142         }
1143         mti->mti_attr.ma_need = MA_INODE;
1144         mti->mti_attr.ma_valid = 0;
1145         mo_attr_get(mti->mti_env, mdt_object_child(obj), &mti->mti_attr);
1146         mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
1147                            mdt_object_fid(obj));
1148         if (mti->mti_ioepoch && (mti->mti_ioepoch->flags & MF_EPOCH_OPEN)) {
1149                 struct mdt_file_data *mfd;
1150                 struct mdt_body *repbody;
1151
1152                 repbody = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1153                 repbody->ioepoch = obj->mot_ioepoch;
1154                 cfs_spin_lock(&med->med_open_lock);
1155                 cfs_list_for_each_entry(mfd, &med->med_open_head, mfd_list) {
1156                         if (mfd->mfd_xid == req->rq_xid)
1157                                 break;
1158                 }
1159                 LASSERT(&mfd->mfd_list != &med->med_open_head);
1160                 cfs_spin_unlock(&med->med_open_lock);
1161                 repbody->handle.cookie = mfd->mfd_handle.h_cookie;
1162         }
1163
1164         mdt_object_put(mti->mti_env, obj);
1165 }
1166
1167 typedef void (*mdt_reconstructor)(struct mdt_thread_info *mti,
1168                                   struct mdt_lock_handle *lhc);
1169
1170 static mdt_reconstructor reconstructors[REINT_MAX] = {
1171         [REINT_SETATTR]  = mdt_reconstruct_setattr,
1172         [REINT_CREATE]   = mdt_reconstruct_create,
1173         [REINT_LINK]     = mdt_reconstruct_generic,
1174         [REINT_UNLINK]   = mdt_reconstruct_generic,
1175         [REINT_RENAME]   = mdt_reconstruct_generic,
1176         [REINT_OPEN]     = mdt_reconstruct_open,
1177         [REINT_SETXATTR] = mdt_reconstruct_generic
1178 };
1179
1180 void mdt_reconstruct(struct mdt_thread_info *mti,
1181                      struct mdt_lock_handle *lhc)
1182 {
1183         ENTRY;
1184         reconstructors[mti->mti_rr.rr_opcode](mti, lhc);
1185         EXIT;
1186 }