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