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 (c) 2007, 2010, Oracle and/or its affiliates. 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                 if (last_rcvd_size > lsd->lsd_client_start) {
 419                         LCONSOLE_WARN("Mounting %s at first time on 1.8 FS, "
 420                                       "remove all clients for interop needs\n",
 421                                       obd->obd_name);
 422                         simple_truncate(lsi->lsi_srv_mnt->mnt_sb->s_root,
 423                                         lsi->lsi_srv_mnt, LAST_RCVD,
 424                                         lsd->lsd_client_start);
 425                         last_rcvd_size = lsd->lsd_client_start;
 426                 }
 427                 /** set 2.0 flag to upgrade/downgrade between 1.8 and 2.0 */
 428                 lsd->lsd_feature_compat |= OBD_COMPAT_20;
 429         }
 430
 431         if (ldd->ldd_flags & LDD_F_IAM_DIR)
 432                 lsd->lsd_feature_incompat |= OBD_INCOMPAT_IAM_DIR;
 433
 434         lsd->lsd_feature_incompat |= OBD_INCOMPAT_FID;
 435
 436         cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 437         mdt->mdt_lut.lut_last_transno = lsd->lsd_last_transno;
 438         cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 439
 440         CDEBUG(D_INODE, "========BEGIN DUMPING LAST_RCVD========\n");
 441         CDEBUG(D_INODE, "%s: server last_transno: "LPU64"\n",
 442                obd->obd_name, mdt->mdt_lut.lut_last_transno);
 443         CDEBUG(D_INODE, "%s: server mount_count: "LPU64"\n",
 444                obd->obd_name, mount_count + 1);
 445         CDEBUG(D_INODE, "%s: server data size: %u\n",
 446                obd->obd_name, lsd->lsd_server_size);
 447         CDEBUG(D_INODE, "%s: per-client data start: %u\n",
 448                obd->obd_name, lsd->lsd_client_start);
 449         CDEBUG(D_INODE, "%s: per-client data size: %u\n",
 450                obd->obd_name, lsd->lsd_client_size);
 451         CDEBUG(D_INODE, "%s: last_rcvd size: %lu\n",
 452                obd->obd_name, last_rcvd_size);
 453         CDEBUG(D_INODE, "%s: last_rcvd clients: %lu\n", obd->obd_name,
 454                last_rcvd_size <= lsd->lsd_client_start ? 0 :
 455                (last_rcvd_size - lsd->lsd_client_start) /
 456                 lsd->lsd_client_size);
 457         CDEBUG(D_INODE, "========END DUMPING LAST_RCVD========\n");
 458
 459         if (!lsd->lsd_server_size || !lsd->lsd_client_start ||
 460             !lsd->lsd_client_size) {
 461                 CERROR("Bad last_rcvd contents!\n");
 462                 GOTO(out, rc = -EINVAL);
 463         }
 464
 465         rc = mdt_clients_data_init(env, mdt, last_rcvd_size);
 466         if (rc)
 467                 GOTO(err_client, rc);
 468
 469         cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 470         /* obd_last_committed is used for compatibility
 471          * with other lustre recovery code */
 472         obd->obd_last_committed = mdt->mdt_lut.lut_last_transno;
 473         cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 474
 475         obd->u.obt.obt_mount_count = mount_count + 1;
 476         lsd->lsd_mount_count = obd->u.obt.obt_mount_count;
 477
 478         /* save it, so mount count and last_transno is current */
 479         rc = mdt_server_data_update(env, mdt);
 480         if (rc)
 481                 GOTO(err_client, rc);
 482
 483         RETURN(0);
 484
 485 err_client:
 486         class_disconnect_exports(obd);
 487 out:
 488         return rc;
 489 }
 490
 491 static int mdt_server_data_update(const struct lu_env *env,
 492                                   struct mdt_device *mdt)
 493 {
 494         struct mdt_thread_info *mti;
 495         struct thandle *th;
 496         int rc;
 497
 498         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 499
 500         mdt_trans_credit_init(env, mdt, MDT_TXN_LAST_RCVD_WRITE_OP);
 501         th = mdt_trans_start(env, mdt);
 502         if (IS_ERR(th))
 503                 RETURN(PTR_ERR(th));
 504
 505         CDEBUG(D_SUPER, "MDS mount_count is "LPU64", last_transno is "LPU64"\n",
 506                mdt->mdt_lut.lut_obd->u.obt.obt_mount_count,
 507                mdt->mdt_lut.lut_last_transno);
 508
 509         cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 510         mdt->mdt_lut.lut_lsd.lsd_last_transno = mdt->mdt_lut.lut_last_transno;
 511         cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 512
 513         rc = mdt_last_rcvd_header_write(env, mdt, th);
 514         mdt_trans_stop(env, mdt, th);
 515         return rc;
 516 }
 517
 518
 519 int mdt_client_new(const struct lu_env *env, struct mdt_device *mdt)
 520 {
 521         unsigned long *bitmap = mdt->mdt_lut.lut_client_bitmap;
 522         struct mdt_thread_info *mti;
 523         struct tg_export_data *ted;
 524         struct lr_server_data  *lsd = &mdt->mdt_lut.lut_lsd;
 525         struct obd_device *obd = mdt2obd_dev(mdt);
 526         struct thandle *th;
 527         loff_t off;
 528         int rc;
 529         int cl_idx;
 530         ENTRY;
 531
 532         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 533         LASSERT(mti != NULL);
 534
 535         ted = &mti->mti_exp->exp_target_data;
 536
 537         LASSERT(bitmap != NULL);
 538         if (!strcmp(ted->ted_lcd->lcd_uuid, obd->obd_uuid.uuid))
 539                 RETURN(0);
 540
 541         /* the bitmap operations can handle cl_idx > sizeof(long) * 8, so
 542          * there's no need for extra complication here
 543          */
 544         cfs_spin_lock(&mdt->mdt_lut.lut_client_bitmap_lock);
 545         cl_idx = cfs_find_first_zero_bit(bitmap, LR_MAX_CLIENTS);
 546         if (cl_idx >= LR_MAX_CLIENTS ||
 547             OBD_FAIL_CHECK(OBD_FAIL_MDS_CLIENT_ADD)) {
 548                 CERROR("no room for %u clients - fix LR_MAX_CLIENTS\n",
 549                        cl_idx);
 550                 cfs_spin_unlock(&mdt->mdt_lut.lut_client_bitmap_lock);
 551                 RETURN(-EOVERFLOW);
 552         }
 553         cfs_set_bit(cl_idx, bitmap);
 554         cfs_spin_unlock(&mdt->mdt_lut.lut_client_bitmap_lock);
 555
 556         CDEBUG(D_INFO, "client at idx %d with UUID '%s' added\n",
 557                cl_idx, ted->ted_lcd->lcd_uuid);
 558
 559         ted->ted_lr_idx = cl_idx;
 560         ted->ted_lr_off = lsd->lsd_client_start +
 561                           (cl_idx * lsd->lsd_client_size);
 562         cfs_init_mutex(&ted->ted_lcd_lock);
 563
 564         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 565
 566         /* Write new client data. */
 567         off = ted->ted_lr_off;
 568
 569         if (OBD_FAIL_CHECK(OBD_FAIL_TGT_CLIENT_ADD))
 570                 RETURN(-ENOSPC);
 571
 572         mdt_trans_credit_init(env, mdt, MDT_TXN_LAST_RCVD_WRITE_OP);
 573
 574         th = mdt_trans_start(env, mdt);
 575         if (IS_ERR(th))
 576                 RETURN(PTR_ERR(th));
 577
 578         /*
 579          * Until this operations will be committed the sync is needed
 580          * for this export. This should be done _after_ starting the
 581          * transaction so that many connecting clients will not bring
 582          * server down with lots of sync writes.
 583          */
 584         mdt_trans_add_cb(th, lut_cb_client, class_export_cb_get(mti->mti_exp));
 585         cfs_spin_lock(&mti->mti_exp->exp_lock);
 586         mti->mti_exp->exp_need_sync = 1;
 587         cfs_spin_unlock(&mti->mti_exp->exp_lock);
 588
 589         rc = mdt_last_rcvd_write(env, mdt, ted->ted_lcd, &off, th);
 590         CDEBUG(D_INFO, "wrote client lcd at idx %u off %llu (len %u)\n",
 591                cl_idx, ted->ted_lr_off, (int)sizeof(*(ted->ted_lcd)));
 592         mdt_trans_stop(env, mdt, th);
 593
 594         RETURN(rc);
 595 }
 596
 597 /* Add client data to the MDS.  We use a bitmap to locate a free space
 598  * in the last_rcvd file if cl_off is -1 (i.e. a new client).
 599  * Otherwise, we just have to read the data from the last_rcvd file and
 600  * we know its offset.
 601  *
 602  * It should not be possible to fail adding an existing client - otherwise
 603  * mdt_init_server_data() callsite needs to be fixed.
 604  */
 605 int mdt_client_add(const struct lu_env *env,
 606                    struct mdt_device *mdt, int cl_idx)
 607 {
 608         struct mdt_thread_info *mti;
 609         struct tg_export_data  *ted;
 610         unsigned long *bitmap = mdt->mdt_lut.lut_client_bitmap;
 611         struct obd_device *obd = mdt2obd_dev(mdt);
 612         struct lr_server_data *lsd = &mdt->mdt_lut.lut_lsd;
 613         int rc = 0;
 614         ENTRY;
 615
 616         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 617         LASSERT(mti != NULL);
 618
 619         ted = &mti->mti_exp->exp_target_data;
 620
 621         LASSERT(bitmap != NULL);
 622         LASSERTF(cl_idx >= 0, "%d\n", cl_idx);
 623
 624         if (!strcmp(ted->ted_lcd->lcd_uuid, obd->obd_uuid.uuid))
 625                 RETURN(0);
 626
 627         cfs_spin_lock(&mdt->mdt_lut.lut_client_bitmap_lock);
 628         if (cfs_test_and_set_bit(cl_idx, bitmap)) {
 629                 CERROR("MDS client %d: bit already set in bitmap!!\n",
 630                        cl_idx);
 631                 LBUG();
 632         }
 633         cfs_spin_unlock(&mdt->mdt_lut.lut_client_bitmap_lock);
 634
 635         CDEBUG(D_INFO, "client at idx %d with UUID '%s' added\n",
 636                cl_idx, ted->ted_lcd->lcd_uuid);
 637
 638         ted->ted_lr_idx = cl_idx;
 639         ted->ted_lr_off = lsd->lsd_client_start +
 640                           (cl_idx * lsd->lsd_client_size);
 641         cfs_init_mutex(&ted->ted_lcd_lock);
 642
 643         LASSERTF(ted->ted_lr_off > 0, "ted_lr_off = %llu\n", ted->ted_lr_off);
 644
 645         RETURN(rc);
 646 }
 647
 648 int mdt_client_del(const struct lu_env *env, struct mdt_device *mdt)
 649 {
 650         struct mdt_thread_info *mti;
 651         struct tg_export_data  *ted;
 652         struct obd_device      *obd = mdt2obd_dev(mdt);
 653         struct obd_export      *exp;
 654         struct thandle         *th;
 655         loff_t                  off;
 656         int                     rc = 0;
 657         ENTRY;
 658
 659         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 660         LASSERT(mti != NULL);
 661
 662         exp = mti->mti_exp;
 663         ted = &exp->exp_target_data;
 664         if (!ted->ted_lcd)
 665                 RETURN(0);
 666
 667         /* XXX: If lcd_uuid were a real obd_uuid, I could use obd_uuid_equals */
 668         if (!strcmp(ted->ted_lcd->lcd_uuid, obd->obd_uuid.uuid))
 669                 GOTO(free, 0);
 670
 671         CDEBUG(D_INFO, "freeing client at idx %u, offset %lld\n",
 672                ted->ted_lr_idx, ted->ted_lr_off);
 673
 674         off = ted->ted_lr_off;
 675
 676         /*
 677          * Don't clear ted_lr_idx here as it is likely also unset.  At worst we
 678          * leak a client slot that will be cleaned on the next recovery.
 679          */
 680         if (off <= 0) {
 681                 CERROR("client idx %d has offset %lld\n",
 682                         ted->ted_lr_idx, off);
 683                 GOTO(free, rc = -EINVAL);
 684         }
 685
 686         /*
 687          * Clear the bit _after_ zeroing out the client so we don't race with
 688          * mdt_client_add and zero out new clients.
 689          */
 690         if (!cfs_test_bit(ted->ted_lr_idx, mdt->mdt_lut.lut_client_bitmap)) {
 691                 CERROR("MDT client %u: bit already clear in bitmap!!\n",
 692                        ted->ted_lr_idx);
 693                 LBUG();
 694         }
 695
 696         /* Make sure the server's last_transno is up to date.
 697          * This should be done before zeroing client slot so last_transno will
 698          * be in server data or in client data in case of failure */
 699         mdt_server_data_update(env, mdt);
 700
 701         mdt_trans_credit_init(env, mdt, MDT_TXN_LAST_RCVD_WRITE_OP);
 702         th = mdt_trans_start(env, mdt);
 703         if (IS_ERR(th))
 704                 GOTO(free, rc = PTR_ERR(th));
 705
 706         cfs_mutex_down(&ted->ted_lcd_lock);
 707         memset(ted->ted_lcd->lcd_uuid, 0, sizeof ted->ted_lcd->lcd_uuid);
 708         rc = mdt_last_rcvd_write(env, mdt, ted->ted_lcd, &off, th);
 709         cfs_mutex_up(&ted->ted_lcd_lock);
 710         mdt_trans_stop(env, mdt, th);
 711
 712         CDEBUG(rc == 0 ? D_INFO : D_ERROR, "Zeroing out client idx %u in "
 713                "%s, rc %d\n",  ted->ted_lr_idx, LAST_RCVD, rc);
 714         RETURN(0);
 715 free:
 716         return 0;
 717 }
 718
 719 /*
 720  * last_rcvd & last_committed update callbacks
 721  */
 722 static int mdt_last_rcvd_update(struct mdt_thread_info *mti,
 723                                 struct thandle *th)
 724 {
 725         struct mdt_device *mdt = mti->mti_mdt;
 726         struct ptlrpc_request *req = mdt_info_req(mti);
 727         struct tg_export_data *ted;
 728         struct lsd_client_data *lcd;
 729         loff_t off;
 730         int err;
 731         __s32 rc = th->th_result;
 732
 733         ENTRY;
 734         LASSERT(req);
 735         LASSERT(req->rq_export);
 736         LASSERT(mdt);
 737         ted = &req->rq_export->exp_target_data;
 738         LASSERT(ted);
 739
 740         cfs_mutex_down(&ted->ted_lcd_lock);
 741         lcd = ted->ted_lcd;
 742         /* if the export has already been disconnected, we have no last_rcvd slot,
 743          * update server data with latest transno then */
 744         if (lcd == NULL) {
 745                 cfs_mutex_up(&ted->ted_lcd_lock);
 746                 CWARN("commit transaction for disconnected client %s: rc %d\n",
 747                       req->rq_export->exp_client_uuid.uuid, rc);
 748                 err = mdt_last_rcvd_header_write(mti->mti_env, mdt, th);
 749                 RETURN(err);
 750         }
 751
 752         off = ted->ted_lr_off;
 753         LASSERT(ergo(mti->mti_transno == 0, rc != 0));
 754         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
 755             lustre_msg_get_opc(req->rq_reqmsg) == MDS_DONE_WRITING) {
 756                 if (mti->mti_transno != 0)
 757                         lcd->lcd_last_close_transno = mti->mti_transno;
 758                 lcd->lcd_last_close_xid = req->rq_xid;
 759                 lcd->lcd_last_close_result = rc;
 760         } else {
 761                 /* VBR: save versions in last_rcvd for reconstruct. */
 762                 __u64 *pre_versions = lustre_msg_get_versions(req->rq_repmsg);
 763                 if (pre_versions) {
 764                         lcd->lcd_pre_versions[0] = pre_versions[0];
 765                         lcd->lcd_pre_versions[1] = pre_versions[1];
 766                         lcd->lcd_pre_versions[2] = pre_versions[2];
 767                         lcd->lcd_pre_versions[3] = pre_versions[3];
 768                 }
 769                 if (mti->mti_transno != 0)
 770                         lcd->lcd_last_transno = mti->mti_transno;
 771                 lcd->lcd_last_xid = req->rq_xid;
 772                 lcd->lcd_last_result = rc;
 773                 /*XXX: save intent_disposition in mdt_thread_info?
 774                  * also there is bug - intent_dispostion is __u64,
 775                  * see struct ldlm_reply->lock_policy_res1; */
 776                 lcd->lcd_last_data = mti->mti_opdata;
 777         }
 778
 779         if (off <= 0) {
 780                 CERROR("client idx %d has offset %lld\n", ted->ted_lr_idx, off);
 781                 err = -EINVAL;
 782         } else {
 783                 err = mdt_last_rcvd_write(mti->mti_env, mdt, lcd, &off, th);
 784         }
 785         cfs_mutex_up(&ted->ted_lcd_lock);
 786         RETURN(err);
 787 }
 788
 789 extern struct lu_context_key mdt_thread_key;
 790
 791 /* add credits for last_rcvd update */
 792 static int mdt_txn_start_cb(const struct lu_env *env,
 793                             struct txn_param *param, void *cookie)
 794 {
 795         struct mdt_device *mdt = cookie;
 796
 797         param->tp_credits += mdt_trans_credit_get(env, mdt,
 798                                                   MDT_TXN_LAST_RCVD_WRITE_OP);
 799         return 0;
 800 }
 801
 802 /* Set new object versions */
 803 static void mdt_version_set(struct mdt_thread_info *info)
 804 {
 805         if (info->mti_mos != NULL) {
 806                 mo_version_set(info->mti_env, mdt_object_child(info->mti_mos),
 807                                info->mti_transno);
 808                 info->mti_mos = NULL;
 809         }
 810 }
 811
 812 /* Update last_rcvd records with latests transaction data */
 813 static int mdt_txn_stop_cb(const struct lu_env *env,
 814                            struct thandle *txn, void *cookie)
 815 {
 816         struct mdt_device *mdt = cookie;
 817         struct mdt_txn_info *txi;
 818         struct mdt_thread_info *mti;
 819         struct ptlrpc_request *req;
 820
 821         /* transno in two contexts - for commit_cb and for thread */
 822         txi = lu_context_key_get(&txn->th_ctx, &mdt_txn_key);
 823         mti = lu_context_key_get(&env->le_ctx, &mdt_thread_key);
 824         req = mdt_info_req(mti);
 825
 826         if (mti->mti_mdt == NULL || req == NULL || mti->mti_no_need_trans) {
 827                 txi->txi_transno = 0;
 828                 mti->mti_no_need_trans = 0;
 829                 return 0;
 830         }
 831
 832         if (mti->mti_has_trans) {
 833                 /* XXX: currently there are allowed cases, but the wrong cases
 834                  * are also possible, so better check is needed here */
 835                 CDEBUG(D_INFO, "More than one transaction "LPU64"\n",
 836                        mti->mti_transno);
 837                 return 0;
 838         }
 839
 840         mti->mti_has_trans = 1;
 841         cfs_spin_lock(&mdt->mdt_lut.lut_translock);
 842         if (txn->th_result != 0) {
 843                 if (mti->mti_transno != 0) {
 844                         CERROR("Replay transno "LPU64" failed: rc %i\n",
 845                                mti->mti_transno, txn->th_result);
 846                 }
 847         } else if (mti->mti_transno == 0) {
 848                 mti->mti_transno = ++ mdt->mdt_lut.lut_last_transno;
 849         } else {
 850                 /* should be replay */
 851                 if (mti->mti_transno > mdt->mdt_lut.lut_last_transno)
 852                         mdt->mdt_lut.lut_last_transno = mti->mti_transno;
 853         }
 854         cfs_spin_unlock(&mdt->mdt_lut.lut_translock);
 855         /* sometimes the reply message has not been successfully packed */
 856         LASSERT(req != NULL && req->rq_repmsg != NULL);
 857
 858         /** VBR: set new versions */
 859         if (txn->th_result == 0)
 860                 mdt_version_set(mti);
 861
 862         /* filling reply data */
 863         CDEBUG(D_INODE, "transno = "LPU64", last_committed = "LPU64"\n",
 864                mti->mti_transno, req->rq_export->exp_obd->obd_last_committed);
 865
 866         req->rq_transno = mti->mti_transno;
 867         lustre_msg_set_transno(req->rq_repmsg, mti->mti_transno);
 868         /* save transno for the commit callback */
 869         txi->txi_transno = mti->mti_transno;
 870
 871         /* add separate commit callback for transaction handling because we need
 872          * export as parameter */
 873         mdt_trans_add_cb(txn, lut_cb_last_committed,
 874                          class_export_cb_get(mti->mti_exp));
 875
 876         return mdt_last_rcvd_update(mti, txn);
 877 }
 878
 879 /* commit callback, need to update last_committed value */
 880 static int mdt_txn_commit_cb(const struct lu_env *env,
 881                              struct thandle *txn, void *cookie)
 882 {
 883         struct mdt_device *mdt = cookie;
 884         struct mdt_txn_info *txi;
 885         int i;
 886
 887         txi = lu_context_key_get(&txn->th_ctx, &mdt_txn_key);
 888
 889         /* iterate through all additional callbacks */
 890         for (i = 0; i < txi->txi_cb_count; i++) {
 891                 txi->txi_cb[i].lut_cb_func(&mdt->mdt_lut, txi->txi_transno,
 892                                            txi->txi_cb[i].lut_cb_data, 0);
 893         }
 894         return 0;
 895 }
 896
 897 int mdt_fs_setup(const struct lu_env *env, struct mdt_device *mdt,
 898                  struct obd_device *obd,
 899                  struct lustre_sb_info *lsi)
 900 {
 901         struct lu_fid fid;
 902         struct dt_object *o;
 903         int rc = 0;
 904         ENTRY;
 905
 906         if (OBD_FAIL_CHECK(OBD_FAIL_MDS_FS_SETUP))
 907                 RETURN(-ENOENT);
 908
 909         /* prepare transactions callbacks */
 910         mdt->mdt_txn_cb.dtc_txn_start = mdt_txn_start_cb;
 911         mdt->mdt_txn_cb.dtc_txn_stop = mdt_txn_stop_cb;
 912         mdt->mdt_txn_cb.dtc_txn_commit = mdt_txn_commit_cb;
 913         mdt->mdt_txn_cb.dtc_cookie = mdt;
 914         mdt->mdt_txn_cb.dtc_tag = LCT_MD_THREAD;
 915         CFS_INIT_LIST_HEAD(&mdt->mdt_txn_cb.dtc_linkage);
 916
 917         dt_txn_callback_add(mdt->mdt_bottom, &mdt->mdt_txn_cb);
 918
 919         rc = mdt_server_data_init(env, mdt, lsi);
 920         if (rc)
 921                 RETURN(rc);
 922
 923         o = dt_store_open(env, mdt->mdt_bottom, "", CAPA_KEYS, &fid);
 924         if (!IS_ERR(o)) {
 925                 mdt->mdt_ck_obj = o;
 926                 rc = mdt_capa_keys_init(env, mdt);
 927                 if (rc)
 928                         GOTO(put_ck_object, rc);
 929         } else {
 930                 rc = PTR_ERR(o);
 931                 CERROR("cannot open %s: rc = %d\n", CAPA_KEYS, rc);
 932                 GOTO(disconnect_exports, rc);
 933         }
 934         RETURN(0);
 935
 936 put_ck_object:
 937         lu_object_put(env, &o->do_lu);
 938         mdt->mdt_ck_obj = NULL;
 939 disconnect_exports:
 940         class_disconnect_exports(obd);
 941         return rc;
 942 }
 943
 944 void mdt_fs_cleanup(const struct lu_env *env, struct mdt_device *mdt)
 945 {
 946         ENTRY;
 947
 948         /* Remove transaction callback */
 949         dt_txn_callback_del(mdt->mdt_bottom, &mdt->mdt_txn_cb);
 950         if (mdt->mdt_ck_obj)
 951                 lu_object_put(env, &mdt->mdt_ck_obj->do_lu);
 952         mdt->mdt_ck_obj = NULL;
 953         EXIT;
 954 }
 955
 956 /* reconstruction code */
 957 static void mdt_steal_ack_locks(struct ptlrpc_request *req)
 958 {
 959         struct obd_export         *exp = req->rq_export;
 960         cfs_list_t                *tmp;
 961         struct ptlrpc_reply_state *oldrep;
 962         struct ptlrpc_service     *svc;
 963         int                        i;
 964
 965         /* CAVEAT EMPTOR: spinlock order */
 966         cfs_spin_lock(&exp->exp_lock);
 967         cfs_list_for_each (tmp, &exp->exp_outstanding_replies) {
 968                 oldrep = cfs_list_entry(tmp, struct ptlrpc_reply_state,
 969                                         rs_exp_list);
 970
 971                 if (oldrep->rs_xid != req->rq_xid)
 972                         continue;
 973
 974                 if (oldrep->rs_opc != lustre_msg_get_opc(req->rq_reqmsg))
 975                         CERROR ("Resent req xid "LPU64" has mismatched opc: "
 976                                 "new %d old %d\n", req->rq_xid,
 977                                 lustre_msg_get_opc(req->rq_reqmsg),
 978                                 oldrep->rs_opc);
 979
 980                 svc = oldrep->rs_service;
 981                 cfs_spin_lock (&svc->srv_lock);
 982
 983                 cfs_list_del_init (&oldrep->rs_exp_list);
 984
 985                 CWARN("Stealing %d locks from rs %p x"LPD64".t"LPD64
 986                       " o%d NID %s\n",
 987                       oldrep->rs_nlocks, oldrep,
 988                       oldrep->rs_xid, oldrep->rs_transno, oldrep->rs_opc,
 989                       libcfs_nid2str(exp->exp_connection->c_peer.nid));
 990
 991                 for (i = 0; i < oldrep->rs_nlocks; i++)
 992                         ptlrpc_save_lock(req, &oldrep->rs_locks[i],
 993                                          oldrep->rs_modes[i], 0);
 994                 oldrep->rs_nlocks = 0;
 995
 996                 DEBUG_REQ(D_HA, req, "stole locks for");
 997                 cfs_spin_lock(&oldrep->rs_lock);
 998                 ptlrpc_schedule_difficult_reply (oldrep);
 999                 cfs_spin_unlock(&oldrep->rs_lock);
1000
1001                 cfs_spin_unlock (&svc->srv_lock);
1002                 break;
1003         }
1004         cfs_spin_unlock(&exp->exp_lock);
1005 }
1006
1007 /**
1008  * VBR: restore versions
1009  */
1010 void mdt_vbr_reconstruct(struct ptlrpc_request *req,
1011                          struct lsd_client_data *lcd)
1012 {
1013         __u64 pre_versions[4] = {0};
1014         pre_versions[0] = lcd->lcd_pre_versions[0];
1015         pre_versions[1] = lcd->lcd_pre_versions[1];
1016         pre_versions[2] = lcd->lcd_pre_versions[2];
1017         pre_versions[3] = lcd->lcd_pre_versions[3];
1018         lustre_msg_set_versions(req->rq_repmsg, pre_versions);
1019 }
1020
1021 void mdt_req_from_lcd(struct ptlrpc_request *req,
1022                       struct lsd_client_data *lcd)
1023 {
1024         DEBUG_REQ(D_HA, req, "restoring transno "LPD64"/status %d",
1025                   lcd->lcd_last_transno, lcd->lcd_last_result);
1026
1027         if (lustre_msg_get_opc(req->rq_reqmsg) == MDS_CLOSE ||
1028             lustre_msg_get_opc(req->rq_repmsg) == MDS_DONE_WRITING) {
1029                 req->rq_transno = lcd->lcd_last_close_transno;
1030                 req->rq_status = lcd->lcd_last_close_result;
1031         } else {
1032                 req->rq_transno = lcd->lcd_last_transno;
1033                 req->rq_status = lcd->lcd_last_result;
1034                 mdt_vbr_reconstruct(req, lcd);
1035         }
1036         if (req->rq_status != 0)
1037                 req->rq_transno = 0;
1038         lustre_msg_set_transno(req->rq_repmsg, req->rq_transno);
1039         lustre_msg_set_status(req->rq_repmsg, req->rq_status);
1040         DEBUG_REQ(D_RPCTRACE, req, "restoring transno "LPD64"/status %d",
1041                   req->rq_transno, req->rq_status);
1042
1043         mdt_steal_ack_locks(req);
1044 }
1045
1046 void mdt_reconstruct_generic(struct mdt_thread_info *mti,
1047                              struct mdt_lock_handle *lhc)
1048 {
1049         struct ptlrpc_request *req = mdt_info_req(mti);
1050         struct tg_export_data *ted = &req->rq_export->exp_target_data;
1051
1052         return mdt_req_from_lcd(req, ted->ted_lcd);
1053 }
1054
1055 static void mdt_reconstruct_create(struct mdt_thread_info *mti,
1056                                    struct mdt_lock_handle *lhc)
1057 {
1058         struct ptlrpc_request  *req = mdt_info_req(mti);
1059         struct obd_export *exp = req->rq_export;
1060         struct tg_export_data *ted = &exp->exp_target_data;
1061         struct mdt_device *mdt = mti->mti_mdt;
1062         struct mdt_object *child;
1063         struct mdt_body *body;
1064         int rc;
1065
1066         mdt_req_from_lcd(req, ted->ted_lcd);
1067         if (req->rq_status)
1068                 return;
1069
1070         /* if no error, so child was created with requested fid */
1071         child = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid2);
1072         if (IS_ERR(child)) {
1073                 rc = PTR_ERR(child);
1074                 LCONSOLE_WARN("Child "DFID" lookup error %d."
1075                               " Evicting client %s with export %s.\n",
1076                               PFID(mdt_object_fid(child)), rc,
1077                               obd_uuid2str(&exp->exp_client_uuid),
1078                               obd_export_nid2str(exp));
1079                 mdt_export_evict(exp);
1080                 EXIT;
1081                 return;
1082         }
1083
1084         body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1085         mti->mti_attr.ma_need = MA_INODE;
1086         mti->mti_attr.ma_valid = 0;
1087         rc = mo_attr_get(mti->mti_env, mdt_object_child(child), &mti->mti_attr);
1088         if (rc == -EREMOTE) {
1089                 /* object was created on remote server */
1090                 req->rq_status = rc;
1091                 body->valid |= OBD_MD_MDS;
1092         }
1093         mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
1094                            mdt_object_fid(child));
1095         mdt_object_put(mti->mti_env, child);
1096 }
1097
1098 static void mdt_reconstruct_setattr(struct mdt_thread_info *mti,
1099                                     struct mdt_lock_handle *lhc)
1100 {
1101         struct ptlrpc_request  *req = mdt_info_req(mti);
1102         struct obd_export *exp = req->rq_export;
1103         struct mdt_export_data *med = &exp->exp_mdt_data;
1104         struct mdt_device *mdt = mti->mti_mdt;
1105         struct mdt_object *obj;
1106         struct mdt_body *body;
1107
1108         mdt_req_from_lcd(req, med->med_ted.ted_lcd);
1109         if (req->rq_status)
1110                 return;
1111
1112         body = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1113         obj = mdt_object_find(mti->mti_env, mdt, mti->mti_rr.rr_fid1);
1114         if (IS_ERR(obj)) {
1115                 int rc = PTR_ERR(obj);
1116                 LCONSOLE_WARN(""DFID" lookup error %d."
1117                               " Evicting client %s with export %s.\n",
1118                               PFID(mdt_object_fid(obj)), rc,
1119                               obd_uuid2str(&exp->exp_client_uuid),
1120                               obd_export_nid2str(exp));
1121                 mdt_export_evict(exp);
1122                 EXIT;
1123                 return;
1124         }
1125         mti->mti_attr.ma_need = MA_INODE;
1126         mti->mti_attr.ma_valid = 0;
1127         mo_attr_get(mti->mti_env, mdt_object_child(obj), &mti->mti_attr);
1128         mdt_pack_attr2body(mti, body, &mti->mti_attr.ma_attr,
1129                            mdt_object_fid(obj));
1130         if (mti->mti_ioepoch && (mti->mti_ioepoch->flags & MF_EPOCH_OPEN)) {
1131                 struct mdt_file_data *mfd;
1132                 struct mdt_body *repbody;
1133
1134                 repbody = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
1135                 repbody->ioepoch = obj->mot_ioepoch;
1136                 cfs_spin_lock(&med->med_open_lock);
1137                 cfs_list_for_each_entry(mfd, &med->med_open_head, mfd_list) {
1138                         if (mfd->mfd_xid == req->rq_xid)
1139                                 break;
1140                 }
1141                 LASSERT(&mfd->mfd_list != &med->med_open_head);
1142                 cfs_spin_unlock(&med->med_open_lock);
1143                 repbody->handle.cookie = mfd->mfd_handle.h_cookie;
1144         }
1145
1146         mdt_object_put(mti->mti_env, obj);
1147 }
1148
1149 typedef void (*mdt_reconstructor)(struct mdt_thread_info *mti,
1150                                   struct mdt_lock_handle *lhc);
1151
1152 static mdt_reconstructor reconstructors[REINT_MAX] = {
1153         [REINT_SETATTR]  = mdt_reconstruct_setattr,
1154         [REINT_CREATE]   = mdt_reconstruct_create,
1155         [REINT_LINK]     = mdt_reconstruct_generic,
1156         [REINT_UNLINK]   = mdt_reconstruct_generic,
1157         [REINT_RENAME]   = mdt_reconstruct_generic,
1158         [REINT_OPEN]     = mdt_reconstruct_open,
1159         [REINT_SETXATTR] = mdt_reconstruct_generic
1160 };
1161
1162 void mdt_reconstruct(struct mdt_thread_info *mti,
1163                      struct mdt_lock_handle *lhc)
1164 {
1165         ENTRY;
1166         reconstructors[mti->mti_rr.rr_opcode](mti, lhc);
1167         EXIT;
1168 }