lustre/lmv/lmv_obd.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) 2004, 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
  37 #ifndef EXPORT_SYMTAB
  38 # define EXPORT_SYMTAB
  39 #endif
  40 #define DEBUG_SUBSYSTEM S_LMV
  41 #ifdef __KERNEL__
  42 #include <linux/slab.h>
  43 #include <linux/module.h>
  44 #include <linux/init.h>
  45 #include <linux/slab.h>
  46 #include <linux/pagemap.h>
  47 #include <linux/mm.h>
  48 #include <asm/div64.h>
  49 #include <linux/seq_file.h>
  50 #include <linux/namei.h>
  51 #else
  52 #include <liblustre.h>
  53 #endif
  54
  55 #include <lustre_log.h>
  56 #include <obd_support.h>
  57 #include <lustre_lib.h>
  58 #include <lustre_net.h>
  59 #include <obd_class.h>
  60 #include <lprocfs_status.h>
  61 #include <lustre_lite.h>
  62 #include <lustre_fid.h>
  63 #include "lmv_internal.h"
  64
  65 /* object cache. */
  66 cfs_mem_cache_t *lmv_object_cache;
  67 cfs_atomic_t lmv_object_count = CFS_ATOMIC_INIT(0);
  68
  69 static void lmv_activate_target(struct lmv_obd *lmv,
  70                                 struct lmv_tgt_desc *tgt,
  71                                 int activate)
  72 {
  73         if (tgt->ltd_active == activate)
  74                 return;
  75
  76         tgt->ltd_active = activate;
  77         lmv->desc.ld_active_tgt_count += (activate ? 1 : -1);
  78 }
  79
  80 /**
  81  * Error codes:
  82  *
  83  *  -EINVAL  : UUID can't be found in the LMV's target list
  84  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
  85  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
  86  */
  87 static int lmv_set_mdc_active(struct lmv_obd *lmv, struct obd_uuid *uuid,
  88                               int activate)
  89 {
  90         struct lmv_tgt_desc    *tgt;
  91         struct obd_device      *obd;
  92         int                     i;
  93         int                     rc = 0;
  94         ENTRY;
  95
  96         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
  97                lmv, uuid->uuid, activate);
  98
  99         cfs_spin_lock(&lmv->lmv_lock);
 100         for (i = 0, tgt = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgt++) {
 101                 if (tgt->ltd_exp == NULL)
 102                         continue;
 103
 104                 CDEBUG(D_INFO, "Target idx %d is %s conn "LPX64"\n",
 105                        i, tgt->ltd_uuid.uuid, tgt->ltd_exp->exp_handle.h_cookie);
 106
 107                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 108                         break;
 109         }
 110
 111         if (i == lmv->desc.ld_tgt_count)
 112                 GOTO(out_lmv_lock, rc = -EINVAL);
 113
 114         obd = class_exp2obd(tgt->ltd_exp);
 115         if (obd == NULL)
 116                 GOTO(out_lmv_lock, rc = -ENOTCONN);
 117
 118         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
 119                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
 120                obd->obd_type->typ_name, i);
 121         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0);
 122
 123         if (tgt->ltd_active == activate) {
 124                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
 125                        activate ? "" : "in");
 126                 GOTO(out_lmv_lock, rc);
 127         }
 128
 129         CDEBUG(D_INFO, "Marking OBD %p %sactive\n", obd,
 130                activate ? "" : "in");
 131         lmv_activate_target(lmv, tgt, activate);
 132         EXIT;
 133
 134  out_lmv_lock:
 135         cfs_spin_unlock(&lmv->lmv_lock);
 136         return rc;
 137 }
 138
 139 static int lmv_set_mdc_data(struct lmv_obd *lmv, struct obd_uuid *uuid,
 140                             struct obd_connect_data *data)
 141 {
 142         struct lmv_tgt_desc    *tgt;
 143         int                     i;
 144         ENTRY;
 145
 146         LASSERT(data != NULL);
 147
 148         cfs_spin_lock(&lmv->lmv_lock);
 149         for (i = 0, tgt = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgt++) {
 150                 if (tgt->ltd_exp == NULL)
 151                         continue;
 152
 153                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid)) {
 154                         lmv->datas[tgt->ltd_idx] = *data;
 155                         break;
 156                 }
 157         }
 158         cfs_spin_unlock(&lmv->lmv_lock);
 159         RETURN(0);
 160 }
 161
 162 struct obd_uuid *lmv_get_uuid(struct obd_export *exp) {
 163         struct obd_device *obd = exp->exp_obd;
 164         struct lmv_obd *lmv = &obd->u.lmv;
 165         return obd_get_uuid(lmv->tgts[0].ltd_exp);
 166 }
 167
 168 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
 169                       enum obd_notify_event ev, void *data)
 170 {
 171         struct obd_connect_data *conn_data;
 172         struct lmv_obd          *lmv = &obd->u.lmv;
 173         struct obd_uuid         *uuid;
 174         int                      rc = 0;
 175         ENTRY;
 176
 177         if (strcmp(watched->obd_type->typ_name, LUSTRE_MDC_NAME)) {
 178                 CERROR("unexpected notification of %s %s!\n",
 179                        watched->obd_type->typ_name,
 180                        watched->obd_name);
 181                 RETURN(-EINVAL);
 182         }
 183
 184         uuid = &watched->u.cli.cl_target_uuid;
 185         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE) {
 186                 /*
 187                  * Set MDC as active before notifying the observer, so the
 188                  * observer can use the MDC normally.
 189                  */
 190                 rc = lmv_set_mdc_active(lmv, uuid,
 191                                         ev == OBD_NOTIFY_ACTIVE);
 192                 if (rc) {
 193                         CERROR("%sactivation of %s failed: %d\n",
 194                                ev == OBD_NOTIFY_ACTIVE ? "" : "de",
 195                                uuid->uuid, rc);
 196                         RETURN(rc);
 197                 }
 198         } else if (ev == OBD_NOTIFY_OCD) {
 199                 conn_data = &watched->u.cli.cl_import->imp_connect_data;
 200
 201                 /*
 202                  * Set connect data to desired target, update exp_connect_flags.
 203                  */
 204                 rc = lmv_set_mdc_data(lmv, uuid, conn_data);
 205                 if (rc) {
 206                         CERROR("can't set connect data to target %s, rc %d\n",
 207                                uuid->uuid, rc);
 208                         RETURN(rc);
 209                 }
 210
 211                 /*
 212                  * XXX: Make sure that ocd_connect_flags from all targets are
 213                  * the same. Otherwise one of MDTs runs wrong version or
 214                  * something like this.  --umka
 215                  */
 216                 obd->obd_self_export->exp_connect_flags =
 217                         conn_data->ocd_connect_flags;
 218         }
 219 #if 0
 220         else if (ev == OBD_NOTIFY_DISCON) {
 221                 /*
 222                  * For disconnect event, flush fld cache for failout MDS case.
 223                  */
 224                 fld_client_flush(&lmv->lmv_fld);
 225         }
 226 #endif
 227         /*
 228          * Pass the notification up the chain.
 229          */
 230         if (obd->obd_observer)
 231                 rc = obd_notify(obd->obd_observer, watched, ev, data);
 232
 233         RETURN(rc);
 234 }
 235
 236 /**
 237  * This is fake connect function. Its purpose is to initialize lmv and say
 238  * caller that everything is okay. Real connection will be performed later.
 239  */
 240 static int lmv_connect(const struct lu_env *env,
 241                        struct obd_export **exp, struct obd_device *obd,
 242                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 243                        void *localdata)
 244 {
 245 #ifdef __KERNEL__
 246         struct proc_dir_entry *lmv_proc_dir;
 247 #endif
 248         struct lmv_obd        *lmv = &obd->u.lmv;
 249         struct lustre_handle  conn = { 0 };
 250         int                    rc = 0;
 251         ENTRY;
 252
 253         /*
 254          * We don't want to actually do the underlying connections more than
 255          * once, so keep track.
 256          */
 257         lmv->refcount++;
 258         if (lmv->refcount > 1) {
 259                 *exp = NULL;
 260                 RETURN(0);
 261         }
 262
 263         rc = class_connect(&conn, obd, cluuid);
 264         if (rc) {
 265                 CERROR("class_connection() returned %d\n", rc);
 266                 RETURN(rc);
 267         }
 268
 269         *exp = class_conn2export(&conn);
 270         class_export_get(*exp);
 271
 272         lmv->exp = *exp;
 273         lmv->connected = 0;
 274         lmv->cluuid = *cluuid;
 275
 276         if (data)
 277                 lmv->conn_data = *data;
 278
 279 #ifdef __KERNEL__
 280         lmv_proc_dir = lprocfs_register("target_obds", obd->obd_proc_entry,
 281                                         NULL, NULL);
 282         if (IS_ERR(lmv_proc_dir)) {
 283                 CERROR("could not register /proc/fs/lustre/%s/%s/target_obds.",
 284                        obd->obd_type->typ_name, obd->obd_name);
 285                 lmv_proc_dir = NULL;
 286         }
 287 #endif
 288
 289         /*
 290          * All real clients should perform actual connection right away, because
 291          * it is possible, that LMV will not have opportunity to connect targets
 292          * and MDC stuff will be called directly, for instance while reading
 293          * ../mdc/../kbytesfree procfs file, etc.
 294          */
 295         if (data->ocd_connect_flags & OBD_CONNECT_REAL)
 296                 rc = lmv_check_connect(obd);
 297
 298 #ifdef __KERNEL__
 299         if (rc) {
 300                 if (lmv_proc_dir)
 301                         lprocfs_remove(&lmv_proc_dir);
 302         }
 303 #endif
 304
 305         RETURN(rc);
 306 }
 307
 308 static void lmv_set_timeouts(struct obd_device *obd)
 309 {
 310         struct lmv_tgt_desc   *tgts;
 311         struct lmv_obd        *lmv;
 312         int                    i;
 313
 314         lmv = &obd->u.lmv;
 315         if (lmv->server_timeout == 0)
 316                 return;
 317
 318         if (lmv->connected == 0)
 319                 return;
 320
 321         for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgts++) {
 322                 if (tgts->ltd_exp == NULL)
 323                         continue;
 324
 325                 obd_set_info_async(tgts->ltd_exp, sizeof(KEY_INTERMDS),
 326                                    KEY_INTERMDS, 0, NULL, NULL);
 327         }
 328 }
 329
 330 static int lmv_init_ea_size(struct obd_export *exp, int easize,
 331                             int def_easize, int cookiesize)
 332 {
 333         struct obd_device   *obd = exp->exp_obd;
 334         struct lmv_obd      *lmv = &obd->u.lmv;
 335         int                  i;
 336         int                  rc = 0;
 337         int                  change = 0;
 338         ENTRY;
 339
 340         if (lmv->max_easize < easize) {
 341                 lmv->max_easize = easize;
 342                 change = 1;
 343         }
 344         if (lmv->max_def_easize < def_easize) {
 345                 lmv->max_def_easize = def_easize;
 346                 change = 1;
 347         }
 348         if (lmv->max_cookiesize < cookiesize) {
 349                 lmv->max_cookiesize = cookiesize;
 350                 change = 1;
 351         }
 352         if (change == 0)
 353                 RETURN(0);
 354
 355         if (lmv->connected == 0)
 356                 RETURN(0);
 357
 358         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 359                 if (lmv->tgts[i].ltd_exp == NULL) {
 360                         CWARN("%s: NULL export for %d\n", obd->obd_name, i);
 361                         continue;
 362                 }
 363
 364                 rc = md_init_ea_size(lmv->tgts[i].ltd_exp, easize, def_easize,
 365                                      cookiesize);
 366                 if (rc) {
 367                         CERROR("obd_init_ea_size() failed on MDT target %d, "
 368                                "error %d.\n", i, rc);
 369                         break;
 370                 }
 371         }
 372         RETURN(rc);
 373 }
 374
 375 #define MAX_STRING_SIZE 128
 376
 377 int lmv_connect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 378 {
 379 #ifdef __KERNEL__
 380         struct proc_dir_entry   *lmv_proc_dir;
 381 #endif
 382         struct lmv_obd          *lmv = &obd->u.lmv;
 383         struct obd_uuid         *cluuid = &lmv->cluuid;
 384         struct obd_connect_data *mdc_data = NULL;
 385         struct obd_uuid          lmv_mdc_uuid = { "LMV_MDC_UUID" };
 386         struct obd_device       *mdc_obd;
 387         struct obd_export       *mdc_exp;
 388         struct lu_fld_target     target;
 389         int                      rc;
 390         ENTRY;
 391
 392         mdc_obd = class_find_client_obd(&tgt->ltd_uuid, LUSTRE_MDC_NAME,
 393                                         &obd->obd_uuid);
 394         if (!mdc_obd) {
 395                 CERROR("target %s not attached\n", tgt->ltd_uuid.uuid);
 396                 RETURN(-EINVAL);
 397         }
 398
 399         CDEBUG(D_CONFIG, "connect to %s(%s) - %s, %s FOR %s\n",
 400                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 401                 tgt->ltd_uuid.uuid, obd->obd_uuid.uuid,
 402                 cluuid->uuid);
 403
 404         if (!mdc_obd->obd_set_up) {
 405                 CERROR("target %s is not set up\n", tgt->ltd_uuid.uuid);
 406                 RETURN(-EINVAL);
 407         }
 408
 409         rc = obd_connect(NULL, &mdc_exp, mdc_obd, &lmv_mdc_uuid,
 410                          &lmv->conn_data, NULL);
 411         if (rc) {
 412                 CERROR("target %s connect error %d\n", tgt->ltd_uuid.uuid, rc);
 413                 RETURN(rc);
 414         }
 415
 416         /*
 417          * Init fid sequence client for this mdc and add new fld target.
 418          */
 419         rc = obd_fid_init(mdc_exp);
 420         if (rc)
 421                 RETURN(rc);
 422
 423         target.ft_srv = NULL;
 424         target.ft_exp = mdc_exp;
 425         target.ft_idx = tgt->ltd_idx;
 426
 427         fld_client_add_target(&lmv->lmv_fld, &target);
 428
 429         mdc_data = &class_exp2cliimp(mdc_exp)->imp_connect_data;
 430
 431         rc = obd_register_observer(mdc_obd, obd);
 432         if (rc) {
 433                 obd_disconnect(mdc_exp);
 434                 CERROR("target %s register_observer error %d\n",
 435                        tgt->ltd_uuid.uuid, rc);
 436                 RETURN(rc);
 437         }
 438
 439         if (obd->obd_observer) {
 440                 /*
 441                  * Tell the observer about the new target.
 442                  */
 443                 rc = obd_notify(obd->obd_observer, mdc_exp->exp_obd,
 444                                 OBD_NOTIFY_ACTIVE, (void *)(tgt - lmv->tgts));
 445                 if (rc) {
 446                         obd_disconnect(mdc_exp);
 447                         RETURN(rc);
 448                 }
 449         }
 450
 451         tgt->ltd_active = 1;
 452         tgt->ltd_exp = mdc_exp;
 453         lmv->desc.ld_active_tgt_count++;
 454
 455         /*
 456          * Copy connect data, it may be used later.
 457          */
 458         lmv->datas[tgt->ltd_idx] = *mdc_data;
 459
 460         md_init_ea_size(tgt->ltd_exp, lmv->max_easize,
 461                         lmv->max_def_easize, lmv->max_cookiesize);
 462
 463         CDEBUG(D_CONFIG, "Connected to %s(%s) successfully (%d)\n",
 464                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 465                 cfs_atomic_read(&obd->obd_refcount));
 466
 467 #ifdef __KERNEL__
 468         lmv_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 469         if (lmv_proc_dir) {
 470                 struct proc_dir_entry *mdc_symlink;
 471
 472                 LASSERT(mdc_obd->obd_type != NULL);
 473                 LASSERT(mdc_obd->obd_type->typ_name != NULL);
 474                 mdc_symlink = lprocfs_add_symlink(mdc_obd->obd_name,
 475                                                   lmv_proc_dir,
 476                                                   "../../../%s/%s",
 477                                                   mdc_obd->obd_type->typ_name,
 478                                                   mdc_obd->obd_name);
 479                 if (mdc_symlink == NULL) {
 480                         CERROR("Could not register LMV target "
 481                                "/proc/fs/lustre/%s/%s/target_obds/%s.",
 482                                obd->obd_type->typ_name, obd->obd_name,
 483                                mdc_obd->obd_name);
 484                         lprocfs_remove(&lmv_proc_dir);
 485                         lmv_proc_dir = NULL;
 486                 }
 487         }
 488 #endif
 489         RETURN(0);
 490 }
 491
 492 int lmv_add_target(struct obd_device *obd, struct obd_uuid *tgt_uuid)
 493 {
 494         struct lmv_obd      *lmv = &obd->u.lmv;
 495         struct lmv_tgt_desc *tgt;
 496         int                  rc = 0;
 497         ENTRY;
 498
 499         CDEBUG(D_CONFIG, "Target uuid: %s.\n", tgt_uuid->uuid);
 500
 501         lmv_init_lock(lmv);
 502
 503         if (lmv->desc.ld_active_tgt_count >= LMV_MAX_TGT_COUNT) {
 504                 lmv_init_unlock(lmv);
 505                 CERROR("Can't add %s, LMV module compiled for %d MDCs. "
 506                        "That many MDCs already configured.\n",
 507                        tgt_uuid->uuid, LMV_MAX_TGT_COUNT);
 508                 RETURN(-EINVAL);
 509         }
 510         if (lmv->desc.ld_tgt_count == 0) {
 511                 struct obd_device *mdc_obd;
 512
 513                 mdc_obd = class_find_client_obd(tgt_uuid, LUSTRE_MDC_NAME,
 514                                                 &obd->obd_uuid);
 515                 if (!mdc_obd) {
 516                         lmv_init_unlock(lmv);
 517                         CERROR("Target %s not attached\n", tgt_uuid->uuid);
 518                         RETURN(-EINVAL);
 519                 }
 520
 521                 rc = obd_llog_init(obd, &obd->obd_olg, mdc_obd, NULL);
 522                 if (rc) {
 523                         lmv_init_unlock(lmv);
 524                         CERROR("lmv failed to setup llogging subsystems\n");
 525                 }
 526         }
 527         cfs_spin_lock(&lmv->lmv_lock);
 528         tgt = lmv->tgts + lmv->desc.ld_tgt_count++;
 529         tgt->ltd_uuid = *tgt_uuid;
 530         cfs_spin_unlock(&lmv->lmv_lock);
 531
 532         if (lmv->connected) {
 533                 rc = lmv_connect_mdc(obd, tgt);
 534                 if (rc) {
 535                         cfs_spin_lock(&lmv->lmv_lock);
 536                         lmv->desc.ld_tgt_count--;
 537                         memset(tgt, 0, sizeof(*tgt));
 538                         cfs_spin_unlock(&lmv->lmv_lock);
 539                 } else {
 540                         int easize = sizeof(struct lmv_stripe_md) +
 541                                      lmv->desc.ld_tgt_count *
 542                                      sizeof(struct lu_fid);
 543                         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0);
 544                 }
 545         }
 546
 547         lmv_init_unlock(lmv);
 548         RETURN(rc);
 549 }
 550
 551 int lmv_check_connect(struct obd_device *obd)
 552 {
 553         struct lmv_obd       *lmv = &obd->u.lmv;
 554         struct lmv_tgt_desc  *tgt;
 555         int                   i;
 556         int                   rc;
 557         int                   easize;
 558         ENTRY;
 559
 560         if (lmv->connected)
 561                 RETURN(0);
 562
 563         lmv_init_lock(lmv);
 564         if (lmv->connected) {
 565                 lmv_init_unlock(lmv);
 566                 RETURN(0);
 567         }
 568
 569         if (lmv->desc.ld_tgt_count == 0) {
 570                 CERROR("%s: no targets configured.\n", obd->obd_name);
 571                 RETURN(-EINVAL);
 572         }
 573
 574         CDEBUG(D_CONFIG, "Time to connect %s to %s\n",
 575                lmv->cluuid.uuid, obd->obd_name);
 576
 577         LASSERT(lmv->tgts != NULL);
 578
 579         for (i = 0, tgt = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgt++) {
 580                 rc = lmv_connect_mdc(obd, tgt);
 581                 if (rc)
 582                         GOTO(out_disc, rc);
 583         }
 584
 585         lmv_set_timeouts(obd);
 586         class_export_put(lmv->exp);
 587         lmv->connected = 1;
 588         easize = lmv_get_easize(lmv);
 589         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0);
 590         lmv_init_unlock(lmv);
 591         RETURN(0);
 592
 593  out_disc:
 594         while (i-- > 0) {
 595                 int rc2;
 596                 --tgt;
 597                 tgt->ltd_active = 0;
 598                 if (tgt->ltd_exp) {
 599                         --lmv->desc.ld_active_tgt_count;
 600                         rc2 = obd_disconnect(tgt->ltd_exp);
 601                         if (rc2) {
 602                                 CERROR("LMV target %s disconnect on "
 603                                        "MDC idx %d: error %d\n",
 604                                        tgt->ltd_uuid.uuid, i, rc2);
 605                         }
 606                 }
 607         }
 608         class_disconnect(lmv->exp);
 609         lmv_init_unlock(lmv);
 610         RETURN(rc);
 611 }
 612
 613 static int lmv_disconnect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 614 {
 615 #ifdef __KERNEL__
 616         struct proc_dir_entry  *lmv_proc_dir;
 617 #endif
 618         struct lmv_obd         *lmv = &obd->u.lmv;
 619         struct obd_device      *mdc_obd;
 620         int                     rc;
 621         ENTRY;
 622
 623         LASSERT(tgt != NULL);
 624         LASSERT(obd != NULL);
 625
 626         mdc_obd = class_exp2obd(tgt->ltd_exp);
 627
 628         if (mdc_obd)
 629                 mdc_obd->obd_no_recov = obd->obd_no_recov;
 630
 631 #ifdef __KERNEL__
 632         lmv_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 633         if (lmv_proc_dir) {
 634                 struct proc_dir_entry *mdc_symlink;
 635
 636                 mdc_symlink = lprocfs_srch(lmv_proc_dir, mdc_obd->obd_name);
 637                 if (mdc_symlink) {
 638                         lprocfs_remove(&mdc_symlink);
 639                 } else {
 640                         CERROR("/proc/fs/lustre/%s/%s/target_obds/%s missing\n",
 641                                obd->obd_type->typ_name, obd->obd_name,
 642                                mdc_obd->obd_name);
 643                 }
 644         }
 645 #endif
 646         rc = obd_fid_fini(tgt->ltd_exp);
 647         if (rc)
 648                 CERROR("Can't finanize fids factory\n");
 649
 650         CDEBUG(D_INFO, "Disconnected from %s(%s) successfully\n",
 651                tgt->ltd_exp->exp_obd->obd_name,
 652                tgt->ltd_exp->exp_obd->obd_uuid.uuid);
 653
 654         obd_register_observer(tgt->ltd_exp->exp_obd, NULL);
 655         rc = obd_disconnect(tgt->ltd_exp);
 656         if (rc) {
 657                 if (tgt->ltd_active) {
 658                         CERROR("Target %s disconnect error %d\n",
 659                                tgt->ltd_uuid.uuid, rc);
 660                 }
 661         }
 662
 663         lmv_activate_target(lmv, tgt, 0);
 664         tgt->ltd_exp = NULL;
 665         RETURN(0);
 666 }
 667
 668 static int lmv_disconnect(struct obd_export *exp)
 669 {
 670         struct obd_device     *obd = class_exp2obd(exp);
 671 #ifdef __KERNEL__
 672         struct proc_dir_entry *lmv_proc_dir;
 673 #endif
 674         struct lmv_obd        *lmv = &obd->u.lmv;
 675         int                    rc;
 676         int                    i;
 677         ENTRY;
 678
 679         if (!lmv->tgts)
 680                 goto out_local;
 681
 682         /*
 683          * Only disconnect the underlying layers on the final disconnect.
 684          */
 685         lmv->refcount--;
 686         if (lmv->refcount != 0)
 687                 goto out_local;
 688
 689         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 690                 if (lmv->tgts[i].ltd_exp == NULL)
 691                         continue;
 692                 lmv_disconnect_mdc(obd, &lmv->tgts[i]);
 693         }
 694
 695 #ifdef __KERNEL__
 696         lmv_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 697         if (lmv_proc_dir) {
 698                 lprocfs_remove(&lmv_proc_dir);
 699         } else {
 700                 CERROR("/proc/fs/lustre/%s/%s/target_obds missing\n",
 701                        obd->obd_type->typ_name, obd->obd_name);
 702         }
 703 #endif
 704
 705 out_local:
 706         /*
 707          * This is the case when no real connection is established by
 708          * lmv_check_connect().
 709          */
 710         if (!lmv->connected)
 711                 class_export_put(exp);
 712         rc = class_disconnect(exp);
 713         if (lmv->refcount == 0)
 714                 lmv->connected = 0;
 715         RETURN(rc);
 716 }
 717
 718 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
 719                          int len, void *karg, void *uarg)
 720 {
 721         struct obd_device    *obddev = class_exp2obd(exp);
 722         struct lmv_obd       *lmv = &obddev->u.lmv;
 723         int                   i = 0;
 724         int                   rc = 0;
 725         int                   set = 0;
 726         int                   count = lmv->desc.ld_tgt_count;
 727         ENTRY;
 728
 729         if (count == 0)
 730                 RETURN(-ENOTTY);
 731
 732         switch (cmd) {
 733         case IOC_OBD_STATFS: {
 734                 struct obd_ioctl_data *data = karg;
 735                 struct obd_device *mdc_obd;
 736                 struct obd_statfs stat_buf = {0};
 737                 __u32 index;
 738
 739                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
 740                 if ((index >= count))
 741                         RETURN(-ENODEV);
 742
 743                 if (!lmv->tgts[index].ltd_active)
 744                         RETURN(-ENODATA);
 745
 746                 mdc_obd = class_exp2obd(lmv->tgts[index].ltd_exp);
 747                 if (!mdc_obd)
 748                         RETURN(-EINVAL);
 749
 750                 /* copy UUID */
 751                 if (cfs_copy_to_user(data->ioc_pbuf2, obd2cli_tgt(mdc_obd),
 752                                      min((int) data->ioc_plen2,
 753                                          (int) sizeof(struct obd_uuid))))
 754                         RETURN(-EFAULT);
 755
 756                 rc = obd_statfs(mdc_obd, &stat_buf,
 757                                 cfs_time_current_64() - CFS_HZ, 0);
 758                 if (rc)
 759                         RETURN(rc);
 760                 if (cfs_copy_to_user(data->ioc_pbuf1, &stat_buf,
 761                                      min((int) data->ioc_plen1,
 762                                          (int) sizeof(stat_buf))))
 763                         RETURN(-EFAULT);
 764                 break;
 765         }
 766         case OBD_IOC_QUOTACTL: {
 767                 struct if_quotactl *qctl = karg;
 768                 struct lmv_tgt_desc *tgt = NULL;
 769                 struct obd_quotactl *oqctl;
 770
 771                 if (qctl->qc_valid == QC_MDTIDX) {
 772                         if (qctl->qc_idx < 0 || count <= qctl->qc_idx)
 773                                 RETURN(-EINVAL);
 774
 775                         tgt = &lmv->tgts[qctl->qc_idx];
 776                         if (!tgt->ltd_exp)
 777                                 RETURN(-EINVAL);
 778                 } else if (qctl->qc_valid == QC_UUID) {
 779                         for (i = 0; i < count; i++) {
 780                                 tgt = &lmv->tgts[i];
 781                                 if (!obd_uuid_equals(&tgt->ltd_uuid,
 782                                                      &qctl->obd_uuid))
 783                                         continue;
 784
 785                                 if (tgt->ltd_exp == NULL)
 786                                         RETURN(-EINVAL);
 787
 788                                 break;
 789                         }
 790                 } else {
 791                         RETURN(-EINVAL);
 792                 }
 793
 794                 if (i >= count)
 795                         RETURN(-EAGAIN);
 796
 797                 LASSERT(tgt && tgt->ltd_exp);
 798                 OBD_ALLOC_PTR(oqctl);
 799                 if (!oqctl)
 800                         RETURN(-ENOMEM);
 801
 802                 QCTL_COPY(oqctl, qctl);
 803                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
 804                 if (rc == 0) {
 805                         QCTL_COPY(qctl, oqctl);
 806                         qctl->qc_valid = QC_MDTIDX;
 807                         qctl->obd_uuid = tgt->ltd_uuid;
 808                 }
 809                 OBD_FREE_PTR(oqctl);
 810                 break;
 811         }
 812         case OBD_IOC_CHANGELOG_SEND:
 813         case OBD_IOC_CHANGELOG_CLEAR: {
 814                 struct ioc_changelog *icc = karg;
 815
 816                 if (icc->icc_mdtindex >= count)
 817                         RETURN(-ENODEV);
 818
 819                 rc = obd_iocontrol(cmd, lmv->tgts[icc->icc_mdtindex].ltd_exp,
 820                                    sizeof(*icc), icc, NULL);
 821                 break;
 822         }
 823         case LL_IOC_GET_CONNECT_FLAGS: {
 824                 rc = obd_iocontrol(cmd, lmv->tgts[0].ltd_exp, len, karg, uarg);
 825                 break;
 826         }
 827
 828         default : {
 829                 for (i = 0; i < count; i++) {
 830                         int err;
 831
 832                         if (lmv->tgts[i].ltd_exp == NULL)
 833                                 continue;
 834
 835                         err = obd_iocontrol(cmd, lmv->tgts[i].ltd_exp, len,
 836                                             karg, uarg);
 837                         if (err == -ENODATA && cmd == OBD_IOC_POLL_QUOTACHECK) {
 838                                 RETURN(err);
 839                         } else if (err) {
 840                                 if (lmv->tgts[i].ltd_active) {
 841                                         CERROR("error: iocontrol MDC %s on MDT"
 842                                                "idx %d cmd %x: err = %d\n",
 843                                                 lmv->tgts[i].ltd_uuid.uuid,
 844                                                 i, cmd, err);
 845                                         if (!rc)
 846                                                 rc = err;
 847                                 }
 848                         } else
 849                                 set = 1;
 850                 }
 851                 if (!set && !rc)
 852                         rc = -EIO;
 853         }
 854         }
 855         RETURN(rc);
 856 }
 857
 858 static int lmv_all_chars_policy(int count, const char *name,
 859                                 int len)
 860 {
 861         unsigned int c = 0;
 862
 863         while (len > 0)
 864                 c += name[--len];
 865         c = c % count;
 866         return c;
 867 }
 868
 869 static int lmv_nid_policy(struct lmv_obd *lmv)
 870 {
 871         struct obd_import *imp;
 872         __u32              id;
 873
 874         /*
 875          * XXX: To get nid we assume that underlying obd device is mdc.
 876          */
 877         imp = class_exp2cliimp(lmv->tgts[0].ltd_exp);
 878         id = imp->imp_connection->c_self ^ (imp->imp_connection->c_self >> 32);
 879         return id % lmv->desc.ld_tgt_count;
 880 }
 881
 882 static int lmv_choose_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
 883                           placement_policy_t placement)
 884 {
 885         switch (placement) {
 886         case PLACEMENT_CHAR_POLICY:
 887                 return lmv_all_chars_policy(lmv->desc.ld_tgt_count,
 888                                             op_data->op_name,
 889                                             op_data->op_namelen);
 890         case PLACEMENT_NID_POLICY:
 891                 return lmv_nid_policy(lmv);
 892
 893         default:
 894                 break;
 895         }
 896
 897         CERROR("Unsupported placement policy %x\n", placement);
 898         return -EINVAL;
 899 }
 900
 901 /**
 902  * This is _inode_ placement policy function (not name).
 903  */
 904 static int lmv_placement_policy(struct obd_device *obd,
 905                                 struct md_op_data *op_data,
 906                                 mdsno_t *mds)
 907 {
 908         struct lmv_obd          *lmv = &obd->u.lmv;
 909         struct lmv_object       *obj;
 910         int                      rc;
 911         ENTRY;
 912
 913         LASSERT(mds != NULL);
 914
 915         if (lmv->desc.ld_tgt_count == 1) {
 916                 *mds = 0;
 917                 RETURN(0);
 918         }
 919
 920         /*
 921          * Allocate new fid on target according to operation type and parent
 922          * home mds.
 923          */
 924         obj = lmv_object_find(obd, &op_data->op_fid1);
 925         if (obj != NULL || op_data->op_name == NULL ||
 926             op_data->op_opc != LUSTRE_OPC_MKDIR) {
 927                 /*
 928                  * Allocate fid for non-dir or for null name or for case parent
 929                  * dir is split.
 930                  */
 931                 if (obj) {
 932                         lmv_object_put(obj);
 933
 934                         /*
 935                          * If we have this flag turned on, and we see that
 936                          * parent dir is split, this means, that caller did not
 937                          * notice split yet. This is race and we would like to
 938                          * let caller know that.
 939                          */
 940                         if (op_data->op_bias & MDS_CHECK_SPLIT)
 941                                 RETURN(-ERESTART);
 942                 }
 943
 944                 /*
 945                  * Allocate new fid on same mds where parent fid is located and
 946                  * where operation will be sent. In case of split dir, ->op_fid1
 947                  * and ->op_mds here will contain fid and mds of slave directory
 948                  * object (assigned by caller).
 949                  */
 950                 *mds = op_data->op_mds;
 951                 rc = 0;
 952         } else {
 953                 /*
 954                  * Parent directory is not split and we want to create a
 955                  * directory in it. Let's calculate where to place it according
 956                  * to operation data @op_data.
 957                  */
 958                 *mds = lmv_choose_mds(lmv, op_data, lmv->lmv_placement);
 959                 rc = 0;
 960         }
 961
 962         if (rc) {
 963                 CERROR("Can't choose MDS, err = %d\n", rc);
 964         } else {
 965                 LASSERT(*mds < lmv->desc.ld_tgt_count);
 966         }
 967
 968         RETURN(rc);
 969 }
 970
 971 int __lmv_fid_alloc(struct lmv_obd *lmv, struct lu_fid *fid,
 972                     mdsno_t mds)
 973 {
 974         struct lmv_tgt_desc *tgt;
 975         int                  rc;
 976         ENTRY;
 977
 978         tgt = lmv_get_target(lmv, mds);
 979
 980         /*
 981          * New seq alloc and FLD setup should be atomic. Otherwise we may find
 982          * on server that seq in new allocated fid is not yet known.
 983          */
 984         cfs_down(&tgt->ltd_fid_sem);
 985
 986         if (!tgt->ltd_active)
 987                 GOTO(out, rc = -ENODEV);
 988
 989         /*
 990          * Asking underlaying tgt layer to allocate new fid.
 991          */
 992         rc = obd_fid_alloc(tgt->ltd_exp, fid, NULL);
 993         if (rc > 0) {
 994                 LASSERT(fid_is_sane(fid));
 995                 rc = 0;
 996         }
 997
 998         EXIT;
 999 out:
1000         cfs_up(&tgt->ltd_fid_sem);
1001         return rc;
1002 }
1003
1004 int lmv_fid_alloc(struct obd_export *exp, struct lu_fid *fid,
1005                   struct md_op_data *op_data)
1006 {
1007         struct obd_device     *obd = class_exp2obd(exp);
1008         struct lmv_obd        *lmv = &obd->u.lmv;
1009         mdsno_t                mds;
1010         int                    rc;
1011         ENTRY;
1012
1013         LASSERT(op_data != NULL);
1014         LASSERT(fid != NULL);
1015
1016         rc = lmv_placement_policy(obd, op_data, &mds);
1017         if (rc) {
1018                 CERROR("Can't get target for allocating fid, "
1019                        "rc %d\n", rc);
1020                 RETURN(rc);
1021         }
1022
1023         rc = __lmv_fid_alloc(lmv, fid, mds);
1024         if (rc) {
1025                 CERROR("Can't alloc new fid, rc %d\n", rc);
1026                 RETURN(rc);
1027         }
1028
1029         RETURN(rc);
1030 }
1031
1032 static int lmv_fid_delete(struct obd_export *exp, const struct lu_fid *fid)
1033 {
1034         ENTRY;
1035         LASSERT(exp != NULL && fid != NULL);
1036         if (lmv_object_delete(exp, fid)) {
1037                 CDEBUG(D_INODE, "Object "DFID" is destroyed.\n",
1038                        PFID(fid));
1039         }
1040         RETURN(0);
1041 }
1042
1043 static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
1044 {
1045         struct lmv_obd             *lmv = &obd->u.lmv;
1046         struct lprocfs_static_vars  lvars;
1047         struct lmv_desc            *desc;
1048         int                         rc;
1049         int                         i = 0;
1050         ENTRY;
1051
1052         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1053                 CERROR("LMV setup requires a descriptor\n");
1054                 RETURN(-EINVAL);
1055         }
1056
1057         desc = (struct lmv_desc *)lustre_cfg_buf(lcfg, 1);
1058         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1059                 CERROR("Lmv descriptor size wrong: %d > %d\n",
1060                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1061                 RETURN(-EINVAL);
1062         }
1063
1064         lmv->tgts_size = LMV_MAX_TGT_COUNT * sizeof(struct lmv_tgt_desc);
1065
1066         OBD_ALLOC(lmv->tgts, lmv->tgts_size);
1067         if (lmv->tgts == NULL)
1068                 RETURN(-ENOMEM);
1069
1070         for (i = 0; i < LMV_MAX_TGT_COUNT; i++) {
1071                 cfs_sema_init(&lmv->tgts[i].ltd_fid_sem, 1);
1072                 lmv->tgts[i].ltd_idx = i;
1073         }
1074
1075         lmv->datas_size = LMV_MAX_TGT_COUNT * sizeof(struct obd_connect_data);
1076
1077         OBD_ALLOC(lmv->datas, lmv->datas_size);
1078         if (lmv->datas == NULL)
1079                 GOTO(out_free_tgts, rc = -ENOMEM);
1080
1081         obd_str2uuid(&lmv->desc.ld_uuid, desc->ld_uuid.uuid);
1082         lmv->desc.ld_tgt_count = 0;
1083         lmv->desc.ld_active_tgt_count = 0;
1084         lmv->max_cookiesize = 0;
1085         lmv->max_def_easize = 0;
1086         lmv->max_easize = 0;
1087         lmv->lmv_placement = PLACEMENT_CHAR_POLICY;
1088
1089         cfs_spin_lock_init(&lmv->lmv_lock);
1090         cfs_sema_init(&lmv->init_sem, 1);
1091
1092         rc = lmv_object_setup(obd);
1093         if (rc) {
1094                 CERROR("Can't setup LMV object manager, error %d.\n", rc);
1095                 GOTO(out_free_datas, rc);
1096         }
1097
1098         lprocfs_lmv_init_vars(&lvars);
1099         lprocfs_obd_setup(obd, lvars.obd_vars);
1100 #ifdef LPROCFS
1101         {
1102                 rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd_status",
1103                                         0444, &lmv_proc_target_fops, obd);
1104                 if (rc)
1105                         CWARN("Error adding target_obd_stats file (%d)\n", rc);
1106        }
1107 #endif
1108         rc = fld_client_init(&lmv->lmv_fld, obd->obd_name,
1109                              LUSTRE_CLI_FLD_HASH_DHT);
1110         if (rc) {
1111                 CERROR("Can't init FLD, err %d\n", rc);
1112                 GOTO(out_free_datas, rc);
1113         }
1114
1115         RETURN(0);
1116
1117 out_free_datas:
1118         OBD_FREE(lmv->datas, lmv->datas_size);
1119         lmv->datas = NULL;
1120 out_free_tgts:
1121         OBD_FREE(lmv->tgts, lmv->tgts_size);
1122         lmv->tgts = NULL;
1123         return rc;
1124 }
1125
1126 static int lmv_cleanup(struct obd_device *obd)
1127 {
1128         struct lmv_obd   *lmv = &obd->u.lmv;
1129         ENTRY;
1130
1131         fld_client_fini(&lmv->lmv_fld);
1132         lprocfs_obd_cleanup(obd);
1133         lmv_object_cleanup(obd);
1134         OBD_FREE(lmv->datas, lmv->datas_size);
1135         OBD_FREE(lmv->tgts, lmv->tgts_size);
1136
1137         RETURN(0);
1138 }
1139
1140 static int lmv_process_config(struct obd_device *obd, obd_count len, void *buf)
1141 {
1142         struct lustre_cfg     *lcfg = buf;
1143         struct obd_uuid        tgt_uuid;
1144         int                    rc;
1145         ENTRY;
1146
1147         switch(lcfg->lcfg_command) {
1148         case LCFG_ADD_MDC:
1149                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(tgt_uuid.uuid))
1150                         GOTO(out, rc = -EINVAL);
1151
1152                 obd_str2uuid(&tgt_uuid, lustre_cfg_string(lcfg, 1));
1153                 rc = lmv_add_target(obd, &tgt_uuid);
1154                 GOTO(out, rc);
1155         default: {
1156                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1157                 GOTO(out, rc = -EINVAL);
1158         }
1159         }
1160 out:
1161         RETURN(rc);
1162 }
1163
1164 static int lmv_statfs(struct obd_device *obd, struct obd_statfs *osfs,
1165                       __u64 max_age, __u32 flags)
1166 {
1167         struct lmv_obd        *lmv = &obd->u.lmv;
1168         struct obd_statfs     *temp;
1169         int                    rc = 0;
1170         int                    i;
1171         ENTRY;
1172
1173         rc = lmv_check_connect(obd);
1174         if (rc)
1175                 RETURN(rc);
1176
1177         OBD_ALLOC(temp, sizeof(*temp));
1178         if (temp == NULL)
1179                 RETURN(-ENOMEM);
1180
1181         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1182                 if (lmv->tgts[i].ltd_exp == NULL)
1183                         continue;
1184
1185                 rc = obd_statfs(lmv->tgts[i].ltd_exp->exp_obd, temp,
1186                                 max_age, flags);
1187                 if (rc) {
1188                         CERROR("can't stat MDS #%d (%s), error %d\n", i,
1189                                lmv->tgts[i].ltd_exp->exp_obd->obd_name,
1190                                rc);
1191                         GOTO(out_free_temp, rc);
1192                 }
1193                 if (i == 0) {
1194                         *osfs = *temp;
1195                 } else {
1196                         osfs->os_bavail += temp->os_bavail;
1197                         osfs->os_blocks += temp->os_blocks;
1198                         osfs->os_ffree += temp->os_ffree;
1199                         osfs->os_files += temp->os_files;
1200                 }
1201         }
1202
1203         EXIT;
1204 out_free_temp:
1205         OBD_FREE(temp, sizeof(*temp));
1206         return rc;
1207 }
1208
1209 static int lmv_getstatus(struct obd_export *exp,
1210                          struct lu_fid *fid,
1211                          struct obd_capa **pc)
1212 {
1213         struct obd_device    *obd = exp->exp_obd;
1214         struct lmv_obd       *lmv = &obd->u.lmv;
1215         int                   rc;
1216         ENTRY;
1217
1218         rc = lmv_check_connect(obd);
1219         if (rc)
1220                 RETURN(rc);
1221
1222         rc = md_getstatus(lmv->tgts[0].ltd_exp, fid, pc);
1223         RETURN(rc);
1224 }
1225
1226 static int lmv_getxattr(struct obd_export *exp, const struct lu_fid *fid,
1227                         struct obd_capa *oc, obd_valid valid, const char *name,
1228                         const char *input, int input_size, int output_size,
1229                         int flags, struct ptlrpc_request **request)
1230 {
1231         struct obd_device      *obd = exp->exp_obd;
1232         struct lmv_obd         *lmv = &obd->u.lmv;
1233         struct lmv_tgt_desc    *tgt;
1234         int                     rc;
1235         ENTRY;
1236
1237         rc = lmv_check_connect(obd);
1238         if (rc)
1239                 RETURN(rc);
1240
1241         tgt = lmv_find_target(lmv, fid);
1242         if (IS_ERR(tgt))
1243                 RETURN(PTR_ERR(tgt));
1244
1245         rc = md_getxattr(tgt->ltd_exp, fid, oc, valid, name, input,
1246                          input_size, output_size, flags, request);
1247
1248         RETURN(rc);
1249 }
1250
1251 static int lmv_setxattr(struct obd_export *exp, const struct lu_fid *fid,
1252                         struct obd_capa *oc, obd_valid valid, const char *name,
1253                         const char *input, int input_size, int output_size,
1254                         int flags, __u32 suppgid,
1255                         struct ptlrpc_request **request)
1256 {
1257         struct obd_device      *obd = exp->exp_obd;
1258         struct lmv_obd         *lmv = &obd->u.lmv;
1259         struct lmv_tgt_desc    *tgt;
1260         int                     rc;
1261         ENTRY;
1262
1263         rc = lmv_check_connect(obd);
1264         if (rc)
1265                 RETURN(rc);
1266
1267         tgt = lmv_find_target(lmv, fid);
1268         if (IS_ERR(tgt))
1269                 RETURN(PTR_ERR(tgt));
1270
1271         rc = md_setxattr(tgt->ltd_exp, fid, oc, valid, name, input,
1272                          input_size, output_size, flags, suppgid,
1273                          request);
1274
1275         RETURN(rc);
1276 }
1277
1278 static int lmv_getattr(struct obd_export *exp, struct md_op_data *op_data,
1279                        struct ptlrpc_request **request)
1280 {
1281         struct obd_device       *obd = exp->exp_obd;
1282         struct lmv_obd          *lmv = &obd->u.lmv;
1283         struct lmv_tgt_desc     *tgt;
1284         struct lmv_object       *obj;
1285         int                      rc;
1286         int                      i;
1287         ENTRY;
1288
1289         rc = lmv_check_connect(obd);
1290         if (rc)
1291                 RETURN(rc);
1292
1293         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1294         if (IS_ERR(tgt))
1295                 RETURN(PTR_ERR(tgt));
1296
1297         if (op_data->op_valid & OBD_MD_MDTIDX) {
1298                 op_data->op_mds = tgt->ltd_idx;
1299                 RETURN(0);
1300         }
1301
1302         rc = md_getattr(tgt->ltd_exp, op_data, request);
1303         if (rc)
1304                 RETURN(rc);
1305
1306         obj = lmv_object_find_lock(obd, &op_data->op_fid1);
1307
1308         CDEBUG(D_INODE, "GETATTR for "DFID" %s\n", PFID(&op_data->op_fid1),
1309                obj ? "(split)" : "");
1310
1311         /*
1312          * If object is split, then we loop over all the slaves and gather size
1313          * attribute. In ideal world we would have to gather also mds field from
1314          * all slaves, as object is spread over the cluster and this is
1315          * definitely interesting information and it is not good to loss it,
1316          * but...
1317          */
1318         if (obj) {
1319                 struct mdt_body *body;
1320
1321                 if (*request == NULL) {
1322                         lmv_object_put(obj);
1323                         RETURN(rc);
1324                 }
1325
1326                 body = req_capsule_server_get(&(*request)->rq_pill,
1327                                               &RMF_MDT_BODY);
1328                 LASSERT(body != NULL);
1329
1330                 for (i = 0; i < obj->lo_objcount; i++) {
1331                         if (lmv->tgts[i].ltd_exp == NULL) {
1332                                 CWARN("%s: NULL export for %d\n",
1333                                       obd->obd_name, i);
1334                                 continue;
1335                         }
1336
1337                         /*
1338                          * Skip master object.
1339                          */
1340                         if (lu_fid_eq(&obj->lo_fid, &obj->lo_stripes[i].ls_fid))
1341                                 continue;
1342
1343                         body->size += obj->lo_stripes[i].ls_size;
1344                 }
1345
1346                 lmv_object_put_unlock(obj);
1347         }
1348
1349         RETURN(rc);
1350 }
1351
1352 static int lmv_change_cbdata(struct obd_export *exp, const struct lu_fid *fid,
1353                              ldlm_iterator_t it, void *data)
1354 {
1355         struct obd_device   *obd = exp->exp_obd;
1356         struct lmv_obd      *lmv = &obd->u.lmv;
1357         int                  i;
1358         int                  rc;
1359         ENTRY;
1360
1361         rc = lmv_check_connect(obd);
1362         if (rc)
1363                 RETURN(rc);
1364
1365         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1366
1367         /*
1368          * With CMD every object can have two locks in different namespaces:
1369          * lookup lock in space of mds storing direntry and update/open lock in
1370          * space of mds storing inode.
1371          */
1372         for (i = 0; i < lmv->desc.ld_tgt_count; i++)
1373                 md_change_cbdata(lmv->tgts[i].ltd_exp, fid, it, data);
1374
1375         RETURN(0);
1376 }
1377
1378 static int lmv_find_cbdata(struct obd_export *exp, const struct lu_fid *fid,
1379                            ldlm_iterator_t it, void *data)
1380 {
1381         struct obd_device   *obd = exp->exp_obd;
1382         struct lmv_obd      *lmv = &obd->u.lmv;
1383         int                  i;
1384         int                  rc;
1385         ENTRY;
1386
1387         rc = lmv_check_connect(obd);
1388         if (rc)
1389                 RETURN(rc);
1390
1391         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1392
1393         /*
1394          * With CMD every object can have two locks in different namespaces:
1395          * lookup lock in space of mds storing direntry and update/open lock in
1396          * space of mds storing inode.
1397          */
1398         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1399                 rc = md_find_cbdata(lmv->tgts[i].ltd_exp, fid, it, data);
1400                 if (rc)
1401                         RETURN(rc);
1402         }
1403
1404         RETURN(rc);
1405 }
1406
1407
1408 static int lmv_close(struct obd_export *exp, struct md_op_data *op_data,
1409                      struct md_open_data *mod, struct ptlrpc_request **request)
1410 {
1411         struct obd_device     *obd = exp->exp_obd;
1412         struct lmv_obd        *lmv = &obd->u.lmv;
1413         struct lmv_tgt_desc   *tgt;
1414         int                    rc;
1415         ENTRY;
1416
1417         rc = lmv_check_connect(obd);
1418         if (rc)
1419                 RETURN(rc);
1420
1421         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1422         if (IS_ERR(tgt))
1423                 RETURN(PTR_ERR(tgt));
1424
1425         CDEBUG(D_INODE, "CLOSE "DFID"\n", PFID(&op_data->op_fid1));
1426         rc = md_close(tgt->ltd_exp, op_data, mod, request);
1427         RETURN(rc);
1428 }
1429
1430 /**
1431  * Called in the case MDS returns -ERESTART on create on open, what means that
1432  * directory is split and its LMV presentation object has to be updated.
1433  */
1434 int lmv_handle_split(struct obd_export *exp, const struct lu_fid *fid)
1435 {
1436         struct obd_device       *obd = exp->exp_obd;
1437         struct lmv_obd          *lmv = &obd->u.lmv;
1438         struct ptlrpc_request   *req = NULL;
1439         struct lmv_tgt_desc     *tgt;
1440         struct lmv_object       *obj;
1441         struct lustre_md         md;
1442         struct md_op_data       *op_data;
1443         int                      mealen;
1444         int                      rc;
1445         __u64                    valid;
1446         ENTRY;
1447
1448         md.mea = NULL;
1449         mealen = lmv_get_easize(lmv);
1450
1451         valid = OBD_MD_FLEASIZE | OBD_MD_FLDIREA | OBD_MD_MEA;
1452
1453         tgt = lmv_find_target(lmv, fid);
1454         if (IS_ERR(tgt))
1455                 RETURN(PTR_ERR(tgt));
1456
1457         /*
1458          * Time to update mea of parent fid.
1459          */
1460
1461         OBD_ALLOC_PTR(op_data);
1462         if (op_data == NULL)
1463                 RETURN(-ENOMEM);
1464
1465         op_data->op_fid1 = *fid;
1466         op_data->op_mode = mealen;
1467         op_data->op_valid = valid;
1468
1469         rc = md_getattr(tgt->ltd_exp, op_data, &req);
1470         OBD_FREE_PTR(op_data);
1471         if (rc) {
1472                 CERROR("md_getattr() failed, error %d\n", rc);
1473                 GOTO(cleanup, rc);
1474         }
1475
1476         rc = md_get_lustre_md(tgt->ltd_exp, req, NULL, exp, &md);
1477         if (rc) {
1478                 CERROR("md_get_lustre_md() failed, error %d\n", rc);
1479                 GOTO(cleanup, rc);
1480         }
1481
1482         if (md.mea == NULL)
1483                 GOTO(cleanup, rc = -ENODATA);
1484
1485         obj = lmv_object_create(exp, fid, md.mea);
1486         if (IS_ERR(obj))
1487                 rc = PTR_ERR(obj);
1488         else
1489                 lmv_object_put(obj);
1490
1491         obd_free_memmd(exp, (void *)&md.mea);
1492         EXIT;
1493 cleanup:
1494         if (req)
1495                 ptlrpc_req_finished(req);
1496         return rc;
1497 }
1498
1499 int lmv_create(struct obd_export *exp, struct md_op_data *op_data,
1500                const void *data, int datalen, int mode, __u32 uid,
1501                __u32 gid, cfs_cap_t cap_effective, __u64 rdev,
1502                struct ptlrpc_request **request)
1503 {
1504         struct obd_device       *obd = exp->exp_obd;
1505         struct lmv_obd          *lmv = &obd->u.lmv;
1506         struct lmv_tgt_desc     *tgt;
1507         struct lmv_object       *obj;
1508         int                      rc;
1509         int                      loop = 0;
1510         int                      sidx;
1511         ENTRY;
1512
1513         rc = lmv_check_connect(obd);
1514         if (rc)
1515                 RETURN(rc);
1516
1517         if (!lmv->desc.ld_active_tgt_count)
1518                 RETURN(-EIO);
1519 repeat:
1520         ++loop;
1521         LASSERT(loop <= 2);
1522
1523         obj = lmv_object_find(obd, &op_data->op_fid1);
1524         if (obj) {
1525                 sidx = raw_name2idx(obj->lo_hashtype, obj->lo_objcount,
1526                                        op_data->op_name, op_data->op_namelen);
1527                 op_data->op_fid1 = obj->lo_stripes[sidx].ls_fid;
1528                 op_data->op_bias &= ~MDS_CHECK_SPLIT;
1529                 op_data->op_mds = obj->lo_stripes[sidx].ls_mds;
1530                 tgt = lmv_get_target(lmv, op_data->op_mds);
1531                 lmv_object_put(obj);
1532         } else {
1533                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
1534                 op_data->op_bias |= MDS_CHECK_SPLIT;
1535                 op_data->op_mds = tgt->ltd_idx;
1536         }
1537
1538         if (IS_ERR(tgt))
1539                 RETURN(PTR_ERR(tgt));
1540
1541         rc = lmv_fid_alloc(exp, &op_data->op_fid2, op_data);
1542         if (rc == -ERESTART)
1543                 goto repeat;
1544         else if (rc)
1545                 RETURN(rc);
1546
1547         CDEBUG(D_INODE, "CREATE '%*s' on "DFID" -> mds #%x\n",
1548                op_data->op_namelen, op_data->op_name, PFID(&op_data->op_fid1),
1549                op_data->op_mds);
1550
1551         op_data->op_flags |= MF_MDC_CANCEL_FID1;
1552         rc = md_create(tgt->ltd_exp, op_data, data, datalen, mode, uid, gid,
1553                        cap_effective, rdev, request);
1554         if (rc == 0) {
1555                 if (*request == NULL)
1556                         RETURN(rc);
1557                 CDEBUG(D_INODE, "Created - "DFID"\n", PFID(&op_data->op_fid2));
1558         } else if (rc == -ERESTART) {
1559                 LASSERT(*request != NULL);
1560                 DEBUG_REQ(D_WARNING|D_RPCTRACE, *request,
1561                           "Got -ERESTART during create!\n");
1562                 ptlrpc_req_finished(*request);
1563                 *request = NULL;
1564
1565                 /*
1566                  * Directory got split. Time to update local object and repeat
1567                  * the request with proper MDS.
1568                  */
1569                 rc = lmv_handle_split(exp, &op_data->op_fid1);
1570                 if (rc == 0) {
1571                         rc = lmv_allocate_slaves(obd, &op_data->op_fid1,
1572                                                  op_data, &op_data->op_fid2);
1573                         if (rc)
1574                                 RETURN(rc);
1575                         goto repeat;
1576                 }
1577         }
1578         RETURN(rc);
1579 }
1580
1581 static int lmv_done_writing(struct obd_export *exp,
1582                             struct md_op_data *op_data,
1583                             struct md_open_data *mod)
1584 {
1585         struct obd_device     *obd = exp->exp_obd;
1586         struct lmv_obd        *lmv = &obd->u.lmv;
1587         struct lmv_tgt_desc   *tgt;
1588         int                    rc;
1589         ENTRY;
1590
1591         rc = lmv_check_connect(obd);
1592         if (rc)
1593                 RETURN(rc);
1594
1595         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1596         if (IS_ERR(tgt))
1597                 RETURN(PTR_ERR(tgt));
1598
1599         rc = md_done_writing(tgt->ltd_exp, op_data, mod);
1600         RETURN(rc);
1601 }
1602
1603 static int
1604 lmv_enqueue_slaves(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1605                    struct lookup_intent *it, struct md_op_data *op_data,
1606                    struct lustre_handle *lockh, void *lmm, int lmmsize)
1607 {
1608         struct obd_device     *obd = exp->exp_obd;
1609         struct lmv_obd        *lmv = &obd->u.lmv;
1610         struct lmv_stripe_md  *mea = op_data->op_mea1;
1611         struct md_op_data     *op_data2;
1612         struct lmv_tgt_desc   *tgt;
1613         int                    i;
1614         int                    rc = 0;
1615         ENTRY;
1616
1617         OBD_ALLOC_PTR(op_data2);
1618         if (op_data2 == NULL)
1619                 RETURN(-ENOMEM);
1620
1621         LASSERT(mea != NULL);
1622         for (i = 0; i < mea->mea_count; i++) {
1623                 memset(op_data2, 0, sizeof(*op_data2));
1624                 op_data2->op_fid1 = mea->mea_ids[i];
1625                 op_data2->op_bias = 0;
1626
1627                 tgt = lmv_find_target(lmv, &op_data2->op_fid1);
1628                 if (IS_ERR(tgt))
1629                         GOTO(cleanup, rc = PTR_ERR(tgt));
1630
1631                 if (tgt->ltd_exp == NULL)
1632                         continue;
1633
1634                 rc = md_enqueue(tgt->ltd_exp, einfo, it, op_data2,
1635                                 lockh + i, lmm, lmmsize, NULL, 0);
1636
1637                 CDEBUG(D_INODE, "Take lock on slave "DFID" -> %d/%d\n",
1638                        PFID(&mea->mea_ids[i]), rc, it->d.lustre.it_status);
1639
1640                 if (rc)
1641                         GOTO(cleanup, rc);
1642
1643                 if (it->d.lustre.it_data) {
1644                         struct ptlrpc_request *req;
1645                         req = (struct ptlrpc_request *)it->d.lustre.it_data;
1646                         ptlrpc_req_finished(req);
1647                 }
1648
1649                 if (it->d.lustre.it_status)
1650                         GOTO(cleanup, rc = it->d.lustre.it_status);
1651         }
1652
1653         EXIT;
1654 cleanup:
1655         OBD_FREE_PTR(op_data2);
1656
1657         if (rc != 0) {
1658                 /*
1659                  * Drop all taken locks.
1660                  */
1661                 while (--i >= 0) {
1662                         if (lockh[i].cookie)
1663                                 ldlm_lock_decref(lockh + i, einfo->ei_mode);
1664                         lockh[i].cookie = 0;
1665                 }
1666         }
1667         return rc;
1668 }
1669
1670 static int
1671 lmv_enqueue_remote(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1672                    struct lookup_intent *it, struct md_op_data *op_data,
1673                    struct lustre_handle *lockh, void *lmm, int lmmsize,
1674                    int extra_lock_flags)
1675 {
1676         struct ptlrpc_request      *req = it->d.lustre.it_data;
1677         struct obd_device          *obd = exp->exp_obd;
1678         struct lmv_obd             *lmv = &obd->u.lmv;
1679         struct lustre_handle        plock;
1680         struct lmv_tgt_desc        *tgt;
1681         struct md_op_data          *rdata;
1682         struct lu_fid               fid1;
1683         struct mdt_body            *body;
1684         int                         rc = 0;
1685         int                         pmode;
1686         ENTRY;
1687
1688         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
1689         LASSERT(body != NULL);
1690
1691         if (!(body->valid & OBD_MD_MDS))
1692                 RETURN(0);
1693
1694         CDEBUG(D_INODE, "REMOTE_ENQUEUE '%s' on "DFID" -> "DFID"\n",
1695                LL_IT2STR(it), PFID(&op_data->op_fid1), PFID(&body->fid1));
1696
1697         /*
1698          * We got LOOKUP lock, but we really need attrs.
1699          */
1700         pmode = it->d.lustre.it_lock_mode;
1701         LASSERT(pmode != 0);
1702         memcpy(&plock, lockh, sizeof(plock));
1703         it->d.lustre.it_lock_mode = 0;
1704         it->d.lustre.it_data = NULL;
1705         fid1 = body->fid1;
1706
1707         it->d.lustre.it_disposition &= ~DISP_ENQ_COMPLETE;
1708         ptlrpc_req_finished(req);
1709
1710         tgt = lmv_find_target(lmv, &fid1);
1711         if (IS_ERR(tgt))
1712                 GOTO(out, rc = PTR_ERR(tgt));
1713
1714         OBD_ALLOC_PTR(rdata);
1715         if (rdata == NULL)
1716                 GOTO(out, rc = -ENOMEM);
1717
1718         rdata->op_fid1 = fid1;
1719         rdata->op_bias = MDS_CROSS_REF;
1720
1721         rc = md_enqueue(tgt->ltd_exp, einfo, it, rdata, lockh,
1722                         lmm, lmmsize, NULL, extra_lock_flags);
1723         OBD_FREE_PTR(rdata);
1724         EXIT;
1725 out:
1726         ldlm_lock_decref(&plock, pmode);
1727         return rc;
1728 }
1729
1730 static int
1731 lmv_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1732             struct lookup_intent *it, struct md_op_data *op_data,
1733             struct lustre_handle *lockh, void *lmm, int lmmsize,
1734             struct ptlrpc_request **req, int extra_lock_flags)
1735 {
1736         struct obd_device        *obd = exp->exp_obd;
1737         struct lmv_obd           *lmv = &obd->u.lmv;
1738         struct lmv_tgt_desc      *tgt;
1739         struct lmv_object        *obj;
1740         int                       sidx;
1741         int                       rc;
1742         ENTRY;
1743
1744         rc = lmv_check_connect(obd);
1745         if (rc)
1746                 RETURN(rc);
1747
1748         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID"\n",
1749                LL_IT2STR(it), PFID(&op_data->op_fid1));
1750
1751         if (op_data->op_mea1 && it && it->it_op == IT_UNLINK) {
1752                 rc = lmv_enqueue_slaves(exp, einfo, it, op_data,
1753                                         lockh, lmm, lmmsize);
1754                 RETURN(rc);
1755         }
1756
1757         obj = lmv_object_find(obd, &op_data->op_fid1);
1758         if (obj && op_data->op_namelen) {
1759                 sidx = raw_name2idx(obj->lo_hashtype,
1760                                        obj->lo_objcount,
1761                                        (char *)op_data->op_name,
1762                                        op_data->op_namelen);
1763                 op_data->op_fid1 = obj->lo_stripes[sidx].ls_fid;
1764                 tgt = lmv_get_target(lmv, obj->lo_stripes[sidx].ls_mds);
1765         } else {
1766                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
1767         }
1768         if (obj)
1769                 lmv_object_put(obj);
1770
1771         if (IS_ERR(tgt))
1772                 RETURN(PTR_ERR(tgt));
1773
1774         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID" -> mds #%d\n",
1775                LL_IT2STR(it), PFID(&op_data->op_fid1), tgt->ltd_idx);
1776
1777         rc = md_enqueue(tgt->ltd_exp, einfo, it, op_data, lockh,
1778                         lmm, lmmsize, req, extra_lock_flags);
1779
1780         if (rc == 0 && it && it->it_op == IT_OPEN) {
1781                 rc = lmv_enqueue_remote(exp, einfo, it, op_data, lockh,
1782                                         lmm, lmmsize, extra_lock_flags);
1783         }
1784         RETURN(rc);
1785 }
1786
1787 static int
1788 lmv_getattr_name(struct obd_export *exp,struct md_op_data *op_data,
1789                  struct ptlrpc_request **request)
1790 {
1791         struct ptlrpc_request   *req = NULL;
1792         struct obd_device       *obd = exp->exp_obd;
1793         struct lmv_obd          *lmv = &obd->u.lmv;
1794         struct lu_fid            rid = op_data->op_fid1;
1795         struct lmv_tgt_desc     *tgt;
1796         struct mdt_body         *body;
1797         struct lmv_object       *obj;
1798         obd_valid                valid = op_data->op_valid;
1799         int                      rc;
1800         int                      loop = 0;
1801         int                      sidx;
1802         ENTRY;
1803
1804         rc = lmv_check_connect(obd);
1805         if (rc)
1806                 RETURN(rc);
1807
1808 repeat:
1809         ++loop;
1810         LASSERT(loop <= 2);
1811         obj = lmv_object_find(obd, &rid);
1812         if (obj) {
1813                 sidx = raw_name2idx(obj->lo_hashtype, obj->lo_objcount,
1814                                     op_data->op_name, op_data->op_namelen);
1815                 rid = obj->lo_stripes[sidx].ls_fid;
1816                 tgt = lmv_get_target(lmv, obj->lo_stripes[sidx].ls_mds);
1817                 op_data->op_mds = obj->lo_stripes[sidx].ls_mds;
1818                 valid &= ~OBD_MD_FLCKSPLIT;
1819                 lmv_object_put(obj);
1820         } else {
1821                 tgt = lmv_find_target(lmv, &rid);
1822                 valid |= OBD_MD_FLCKSPLIT;
1823                 op_data->op_mds = tgt->ltd_idx;
1824         }
1825         if (IS_ERR(tgt))
1826                 RETURN(PTR_ERR(tgt));
1827
1828         CDEBUG(D_INODE, "GETATTR_NAME for %*s on "DFID" - "DFID" -> mds #%d\n",
1829                op_data->op_namelen, op_data->op_name, PFID(&op_data->op_fid1),
1830                PFID(&rid), tgt->ltd_idx);
1831
1832         op_data->op_valid = valid;
1833         op_data->op_fid1 = rid;
1834         rc = md_getattr_name(tgt->ltd_exp, op_data, request);
1835         if (rc == 0) {
1836                 body = req_capsule_server_get(&(*request)->rq_pill,
1837                                               &RMF_MDT_BODY);
1838                 LASSERT(body != NULL);
1839
1840                 if (body->valid & OBD_MD_MDS) {
1841                         rid = body->fid1;
1842                         CDEBUG(D_INODE, "Request attrs for "DFID"\n",
1843                                PFID(&rid));
1844
1845                         tgt = lmv_find_target(lmv, &rid);
1846                         if (IS_ERR(tgt)) {
1847                                 ptlrpc_req_finished(*request);
1848                                 RETURN(PTR_ERR(tgt));
1849                         }
1850
1851                         op_data->op_fid1 = rid;
1852                         op_data->op_valid |= OBD_MD_FLCROSSREF;
1853                         op_data->op_namelen = 0;
1854                         op_data->op_name = NULL;
1855                         rc = md_getattr_name(tgt->ltd_exp, op_data, &req);
1856                         ptlrpc_req_finished(*request);
1857                         *request = req;
1858                 }
1859         } else if (rc == -ERESTART) {
1860                 LASSERT(*request != NULL);
1861                 DEBUG_REQ(D_WARNING|D_RPCTRACE, *request,
1862                           "Got -ERESTART during getattr!\n");
1863                 ptlrpc_req_finished(*request);
1864                 *request = NULL;
1865
1866                 /*
1867                  * Directory got split. Time to update local object and repeat
1868                  * the request with proper MDS.
1869                  */
1870                 rc = lmv_handle_split(exp, &rid);
1871                 if (rc == 0)
1872                         goto repeat;
1873         }
1874         RETURN(rc);
1875 }
1876
1877 #define md_op_data_fid(op_data, fl)                     \
1878         (fl == MF_MDC_CANCEL_FID1 ? &op_data->op_fid1 : \
1879          fl == MF_MDC_CANCEL_FID2 ? &op_data->op_fid2 : \
1880          fl == MF_MDC_CANCEL_FID3 ? &op_data->op_fid3 : \
1881          fl == MF_MDC_CANCEL_FID4 ? &op_data->op_fid4 : \
1882          NULL)
1883
1884 static int lmv_early_cancel_slaves(struct obd_export *exp,
1885                                    struct md_op_data *op_data, int op_tgt,
1886                                    ldlm_mode_t mode, int bits, int flag)
1887 {
1888         struct obd_device      *obd = exp->exp_obd;
1889         struct lmv_obd         *lmv = &obd->u.lmv;
1890         ldlm_policy_data_t      policy = {{0}};
1891         struct lu_fid          *op_fid;
1892         struct lu_fid          *st_fid;
1893         struct lmv_tgt_desc    *tgt;
1894         struct lmv_object      *obj;
1895         int                     rc = 0;
1896         int                     i;
1897         ENTRY;
1898
1899         op_fid = md_op_data_fid(op_data, flag);
1900         if (!fid_is_sane(op_fid))
1901                 RETURN(0);
1902
1903         obj = lmv_object_find(obd, op_fid);
1904         if (obj == NULL)
1905                 RETURN(-EALREADY);
1906
1907         policy.l_inodebits.bits = bits;
1908         for (i = 0; i < obj->lo_objcount; i++) {
1909                 tgt = lmv_get_target(lmv, obj->lo_stripes[i].ls_mds);
1910                 st_fid = &obj->lo_stripes[i].ls_fid;
1911                 if (op_tgt != tgt->ltd_idx) {
1912                         CDEBUG(D_INODE, "EARLY_CANCEL slave "DFID" -> mds #%d\n",
1913                                PFID(st_fid), tgt->ltd_idx);
1914                         rc = md_cancel_unused(tgt->ltd_exp, st_fid, &policy,
1915                                               mode, LCF_ASYNC, NULL);
1916                         if (rc)
1917                                 GOTO(out_put_obj, rc);
1918                 } else {
1919                         CDEBUG(D_INODE,
1920                                "EARLY_CANCEL skip operation target %d on "DFID"\n",
1921                                op_tgt, PFID(st_fid));
1922                         /*
1923                          * Do not cancel locks for operation target, they will
1924                          * be handled later in underlaying layer when calling
1925                          * function we run on behalf of.
1926                          */
1927                         *op_fid = *st_fid;
1928                         op_data->op_flags |= flag;
1929                 }
1930         }
1931         EXIT;
1932 out_put_obj:
1933         lmv_object_put(obj);
1934         return rc;
1935 }
1936
1937 static int lmv_early_cancel(struct obd_export *exp, struct md_op_data *op_data,
1938                             int op_tgt, ldlm_mode_t mode, int bits, int flag)
1939 {
1940         struct lu_fid          *fid = md_op_data_fid(op_data, flag);
1941         struct obd_device      *obd = exp->exp_obd;
1942         struct lmv_obd         *lmv = &obd->u.lmv;
1943         struct lmv_tgt_desc    *tgt;
1944         ldlm_policy_data_t      policy = {{0}};
1945         struct lmv_object      *obj;
1946         int                     rc = 0;
1947         ENTRY;
1948
1949         if (!fid_is_sane(fid))
1950                 RETURN(0);
1951
1952         obj = lmv_object_find(obd, fid);
1953         if (obj) {
1954                 rc = lmv_early_cancel_slaves(exp, op_data, op_tgt, mode,
1955                                              bits, flag);
1956                 lmv_object_put(obj);
1957         } else {
1958                 tgt = lmv_find_target(lmv, fid);
1959                 if (IS_ERR(tgt))
1960                         RETURN(PTR_ERR(tgt));
1961
1962                 if (tgt->ltd_idx != op_tgt) {
1963                         CDEBUG(D_INODE, "EARLY_CANCEL on "DFID"\n", PFID(fid));
1964                         policy.l_inodebits.bits = bits;
1965                         rc = md_cancel_unused(tgt->ltd_exp, fid, &policy,
1966                                               mode, LCF_ASYNC, NULL);
1967                 } else {
1968                         CDEBUG(D_INODE,
1969                                "EARLY_CANCEL skip operation target %d on "DFID"\n",
1970                                op_tgt, PFID(fid));
1971                         op_data->op_flags |= flag;
1972                         rc = 0;
1973                 }
1974
1975         }
1976         RETURN(rc);
1977 }
1978
1979 /*
1980  * llite passes fid of an target inode in op_data->op_fid1 and id of directory in
1981  * op_data->op_fid2
1982  */
1983 static int lmv_link(struct obd_export *exp, struct md_op_data *op_data,
1984                     struct ptlrpc_request **request)
1985 {
1986         struct obd_device       *obd = exp->exp_obd;
1987         struct lmv_obd          *lmv = &obd->u.lmv;
1988         struct lmv_tgt_desc     *tgt;
1989         struct lmv_object       *obj;
1990         int                      rc;
1991         int                      loop = 0;
1992         mdsno_t                  mds;
1993         int                      sidx;
1994         ENTRY;
1995
1996         rc = lmv_check_connect(obd);
1997         if (rc)
1998                 RETURN(rc);
1999
2000 repeat:
2001         ++loop;
2002         LASSERT(loop <= 2);
2003         LASSERT(op_data->op_namelen != 0);
2004
2005         CDEBUG(D_INODE, "LINK "DFID":%*s to "DFID"\n",
2006                PFID(&op_data->op_fid2), op_data->op_namelen,
2007                op_data->op_name, PFID(&op_data->op_fid1));
2008
2009         obj = lmv_object_find(obd, &op_data->op_fid2);
2010         if (obj) {
2011                 sidx = raw_name2idx(obj->lo_hashtype,
2012                                     obj->lo_objcount,
2013                                     op_data->op_name,
2014                                     op_data->op_namelen);
2015                 op_data->op_fid2 = obj->lo_stripes[sidx].ls_fid;
2016                 mds = obj->lo_stripes[sidx].ls_mds;
2017                 lmv_object_put(obj);
2018         } else {
2019                 rc = lmv_fld_lookup(lmv, &op_data->op_fid2, &mds);
2020                 if (rc)
2021                         RETURN(rc);
2022         }
2023
2024         CDEBUG(D_INODE, "Forward to mds #%x ("DFID")\n",
2025                mds, PFID(&op_data->op_fid1));
2026
2027         op_data->op_fsuid = cfs_curproc_fsuid();
2028         op_data->op_fsgid = cfs_curproc_fsgid();
2029         op_data->op_cap = cfs_curproc_cap_pack();
2030         tgt = lmv_get_target(lmv, mds);
2031
2032         /*
2033          * Cancel UPDATE lock on child (fid1).
2034          */
2035         op_data->op_flags |= MF_MDC_CANCEL_FID2;
2036         rc = lmv_early_cancel(exp, op_data, tgt->ltd_idx, LCK_EX,
2037                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2038         if (rc == 0)
2039                 rc = md_link(tgt->ltd_exp, op_data, request);
2040         if (rc == -ERESTART) {
2041                 LASSERT(*request != NULL);
2042                 DEBUG_REQ(D_WARNING|D_RPCTRACE, *request,
2043                           "Got -ERESTART during link!\n");
2044                 ptlrpc_req_finished(*request);
2045                 *request = NULL;
2046
2047                 /*
2048                  * Directory got split. Time to update local object and repeat
2049                  * the request with proper MDS.
2050                  */
2051                 rc = lmv_handle_split(exp, &op_data->op_fid2);
2052                 if (rc == 0)
2053                         goto repeat;
2054         }
2055
2056         RETURN(rc);
2057 }
2058
2059 static int lmv_rename(struct obd_export *exp, struct md_op_data *op_data,
2060                       const char *old, int oldlen, const char *new, int newlen,
2061                       struct ptlrpc_request **request)
2062 {
2063         struct obd_device       *obd = exp->exp_obd;
2064         struct lmv_obd          *lmv = &obd->u.lmv;
2065         struct lmv_tgt_desc     *src_tgt;
2066         struct lmv_tgt_desc     *tgt_tgt;
2067         int                      rc;
2068         int                      sidx;
2069         int                      loop = 0;
2070         struct lmv_object       *obj;
2071         mdsno_t                  mds1;
2072         mdsno_t                  mds2;
2073         ENTRY;
2074
2075         LASSERT(oldlen != 0);
2076
2077         CDEBUG(D_INODE, "RENAME %*s in "DFID" to %*s in "DFID"\n",
2078                oldlen, old, PFID(&op_data->op_fid1),
2079                newlen, new, PFID(&op_data->op_fid2));
2080
2081         rc = lmv_check_connect(obd);
2082         if (rc)
2083                 RETURN(rc);
2084
2085 repeat:
2086         ++loop;
2087         LASSERT(loop <= 2);
2088         obj = lmv_object_find(obd, &op_data->op_fid1);
2089         if (obj) {
2090                 sidx = raw_name2idx(obj->lo_hashtype, obj->lo_objcount,
2091                                     (char *)old, oldlen);
2092                 op_data->op_fid1 = obj->lo_stripes[sidx].ls_fid;
2093                 mds1 = obj->lo_stripes[sidx].ls_mds;
2094                 CDEBUG(D_INODE, "Parent obj "DFID"\n", PFID(&op_data->op_fid1));
2095                 lmv_object_put(obj);
2096         } else {
2097                 rc = lmv_fld_lookup(lmv, &op_data->op_fid1, &mds1);
2098                 if (rc)
2099                         RETURN(rc);
2100         }
2101
2102         obj = lmv_object_find(obd, &op_data->op_fid2);
2103         if (obj) {
2104                 /*
2105                  * Directory is already split, so we have to forward request to
2106                  * the right MDS.
2107                  */
2108                 sidx = raw_name2idx(obj->lo_hashtype, obj->lo_objcount,
2109                                        (char *)new, newlen);
2110
2111                 mds2 = obj->lo_stripes[sidx].ls_mds;
2112                 op_data->op_fid2 = obj->lo_stripes[sidx].ls_fid;
2113                 CDEBUG(D_INODE, "Parent obj "DFID"\n", PFID(&op_data->op_fid2));
2114                 lmv_object_put(obj);
2115         } else {
2116                 rc = lmv_fld_lookup(lmv, &op_data->op_fid2, &mds2);
2117                 if (rc)
2118                         RETURN(rc);
2119         }
2120
2121         op_data->op_fsuid = cfs_curproc_fsuid();
2122         op_data->op_fsgid = cfs_curproc_fsgid();
2123         op_data->op_cap = cfs_curproc_cap_pack();
2124
2125         src_tgt = lmv_get_target(lmv, mds1);
2126         tgt_tgt = lmv_get_target(lmv, mds2);
2127
2128         /*
2129          * LOOKUP lock on src child (fid3) should also be cancelled for
2130          * src_tgt in mdc_rename.
2131          */
2132         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2133
2134         /*
2135          * Cancel UPDATE locks on tgt parent (fid2), tgt_tgt is its
2136          * own target.
2137          */
2138         rc = lmv_early_cancel(exp, op_data, src_tgt->ltd_idx,
2139                               LCK_EX, MDS_INODELOCK_UPDATE,
2140                               MF_MDC_CANCEL_FID2);
2141
2142         /*
2143          * Cancel LOOKUP locks on tgt child (fid4) for parent tgt_tgt.
2144          */
2145         if (rc == 0) {
2146                 rc = lmv_early_cancel(exp, op_data, src_tgt->ltd_idx,
2147                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2148                                       MF_MDC_CANCEL_FID4);
2149         }
2150
2151         /*
2152          * Cancel all the locks on tgt child (fid4).
2153          */
2154         if (rc == 0)
2155                 rc = lmv_early_cancel(exp, op_data, src_tgt->ltd_idx,
2156                                       LCK_EX, MDS_INODELOCK_FULL,
2157                                       MF_MDC_CANCEL_FID4);
2158
2159         if (rc == 0)
2160                 rc = md_rename(src_tgt->ltd_exp, op_data, old, oldlen,
2161                                new, newlen, request);
2162
2163         if (rc == -ERESTART) {
2164                 LASSERT(*request != NULL);
2165                 DEBUG_REQ(D_WARNING|D_RPCTRACE, *request,
2166                           "Got -ERESTART during rename!\n");
2167                 ptlrpc_req_finished(*request);
2168                 *request = NULL;
2169
2170                 /*
2171                  * Directory got split. Time to update local object and repeat
2172                  * the request with proper MDS.
2173                  */
2174                 rc = lmv_handle_split(exp, &op_data->op_fid1);
2175                 if (rc == 0)
2176                         goto repeat;
2177         }
2178         RETURN(rc);
2179 }
2180
2181 static int lmv_setattr(struct obd_export *exp, struct md_op_data *op_data,
2182                        void *ea, int ealen, void *ea2, int ea2len,
2183                        struct ptlrpc_request **request,
2184                        struct md_open_data **mod)
2185 {
2186         struct obd_device       *obd = exp->exp_obd;
2187         struct lmv_obd          *lmv = &obd->u.lmv;
2188         struct ptlrpc_request   *req;
2189         struct lmv_tgt_desc     *tgt;
2190         struct lmv_object       *obj;
2191         int                      rc = 0;
2192         int                      i;
2193         ENTRY;
2194
2195         rc = lmv_check_connect(obd);
2196         if (rc)
2197                 RETURN(rc);
2198
2199         obj = lmv_object_find(obd, &op_data->op_fid1);
2200
2201         CDEBUG(D_INODE, "SETATTR for "DFID", valid 0x%x%s\n",
2202                PFID(&op_data->op_fid1), op_data->op_attr.ia_valid,
2203                obj ? ", split" : "");
2204
2205         op_data->op_flags |= MF_MDC_CANCEL_FID1;
2206         if (obj) {
2207                 for (i = 0; i < obj->lo_objcount; i++) {
2208                         op_data->op_fid1 = obj->lo_stripes[i].ls_fid;
2209
2210                         tgt = lmv_get_target(lmv, obj->lo_stripes[i].ls_mds);
2211                         if (IS_ERR(tgt)) {
2212                                 rc = PTR_ERR(tgt);
2213                                 break;
2214                         }
2215
2216                         rc = md_setattr(tgt->ltd_exp, op_data, ea, ealen,
2217                                         ea2, ea2len, &req, mod);
2218
2219                         if (lu_fid_eq(&obj->lo_fid, &obj->lo_stripes[i].ls_fid)) {
2220                                 /*
2221                                  * This is master object and this request should
2222                                  * be returned back to llite.
2223                                  */
2224                                 *request = req;
2225                         } else {
2226                                 ptlrpc_req_finished(req);
2227                         }
2228
2229                         if (rc)
2230                                 break;
2231                 }
2232                 lmv_object_put(obj);
2233         } else {
2234                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
2235                 if (IS_ERR(tgt))
2236                         RETURN(PTR_ERR(tgt));
2237
2238                 rc = md_setattr(tgt->ltd_exp, op_data, ea, ealen, ea2,
2239                                 ea2len, request, mod);
2240         }
2241         RETURN(rc);
2242 }
2243
2244 static int lmv_sync(struct obd_export *exp, const struct lu_fid *fid,
2245                     struct obd_capa *oc, struct ptlrpc_request **request)
2246 {
2247         struct obd_device         *obd = exp->exp_obd;
2248         struct lmv_obd            *lmv = &obd->u.lmv;
2249         struct lmv_tgt_desc       *tgt;
2250         int                        rc;
2251         ENTRY;
2252
2253         rc = lmv_check_connect(obd);
2254         if (rc)
2255                 RETURN(rc);
2256
2257         tgt = lmv_find_target(lmv, fid);
2258         if (IS_ERR(tgt))
2259                 RETURN(PTR_ERR(tgt));
2260
2261         rc = md_sync(tgt->ltd_exp, fid, oc, request);
2262         RETURN(rc);
2263 }
2264
2265 /**
2266  * Main purpose of LMV blocking ast is to remove split directory LMV
2267  * presentation object (struct lmv_object) attached to the lock being revoked.
2268  */
2269 int lmv_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2270                      void *data, int flag)
2271 {
2272         struct lustre_handle    lockh;
2273         struct lmv_object      *obj;
2274         int                     rc;
2275         ENTRY;
2276
2277         switch (flag) {
2278         case LDLM_CB_BLOCKING:
2279                 ldlm_lock2handle(lock, &lockh);
2280                 rc = ldlm_cli_cancel(&lockh);
2281                 if (rc < 0) {
2282                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
2283                         RETURN(rc);
2284                 }
2285                 break;
2286         case LDLM_CB_CANCELING:
2287                 /*
2288                  * Time to drop cached attrs for split directory object
2289                  */
2290                 obj = lock->l_ast_data;
2291                 if (obj) {
2292                         CDEBUG(D_INODE, "Cancel %s on "LPU64"/"LPU64
2293                                ", master "DFID"\n",
2294                                lock->l_resource->lr_name.name[3] == 1 ?
2295                                "LOOKUP" : "UPDATE",
2296                                lock->l_resource->lr_name.name[0],
2297                                lock->l_resource->lr_name.name[1],
2298                                PFID(&obj->lo_fid));
2299                         lmv_object_put(obj);
2300                 }
2301                 break;
2302         default:
2303                 LBUG();
2304         }
2305         RETURN(0);
2306 }
2307
2308 static void lmv_hash_adjust(__u64 *hash, __u64 hash_adj)
2309 {
2310         __u64         val;
2311
2312         val = le64_to_cpu(*hash);
2313         if (val < hash_adj)
2314                 val += MAX_HASH_SIZE;
2315         if (val != DIR_END_OFF)
2316                 *hash = cpu_to_le64(val - hash_adj);
2317 }
2318
2319 static __u32 lmv_node_rank(struct obd_export *exp, const struct lu_fid *fid)
2320 {
2321         __u64              id;
2322         struct obd_import *imp;
2323
2324         /*
2325          * XXX: to get nid we assume that underlying obd device is mdc.
2326          */
2327         imp  = class_exp2cliimp(exp);
2328         id   = imp->imp_connection->c_self + fid_flatten(fid);
2329
2330         CDEBUG(D_INODE, "Readpage node rank: "LPX64" "DFID" "LPX64" "LPX64"\n",
2331                imp->imp_connection->c_self, PFID(fid), id, id ^ (id >> 32));
2332
2333         return id ^ (id >> 32);
2334 }
2335
2336 static int lmv_readpage(struct obd_export *exp, const struct lu_fid *fid,
2337                         struct obd_capa *oc, __u64 offset64, struct page *page,
2338                         struct ptlrpc_request **request)
2339 {
2340         struct obd_device       *obd = exp->exp_obd;
2341         struct lmv_obd          *lmv = &obd->u.lmv;
2342         struct lu_fid            rid = *fid;
2343         struct lmv_object       *obj;
2344         __u64                    offset;
2345         __u64                    hash_adj = 0;
2346         __u32                    rank = 0;
2347         __u64                    seg_size = 0;
2348         __u64                    tgt_tmp = 0;
2349         int                      tgt_idx = 0;
2350         int                      tgt0_idx = 0;
2351         int                      rc;
2352         int                      nr = 0;
2353         struct lmv_stripe       *los;
2354         struct lmv_tgt_desc     *tgt;
2355         struct lu_dirpage       *dp;
2356         struct lu_dirent        *ent;
2357         ENTRY;
2358
2359         offset = offset64;
2360
2361         rc = lmv_check_connect(obd);
2362         if (rc)
2363                 RETURN(rc);
2364
2365         CDEBUG(D_INODE, "READPAGE at "LPX64" from "DFID"\n", offset, PFID(&rid));
2366
2367         /*
2368          * This case handle directory lookup in clustered metadata case (i.e.
2369          * split directory is located on multiple md servers.)
2370          * each server keeps directory entries for certain range of hashes.
2371          * E.g. we have N server and suppose hash range is 0 to MAX_HASH.
2372          * first server will keep records with hashes [ 0 ... MAX_HASH / N  - 1],
2373          * second one with hashes [MAX_HASH / N ... 2 * MAX_HASH / N] and
2374          * so on....
2375          *      readdir can simply start reading entries from 0 - N server in
2376          * order but that will not scale well as all client will request dir in
2377          * to server in same order.
2378          * Following algorithm does optimization:
2379          * Instead of doing readdir in 1, 2, ...., N order, client with a
2380          * rank R does readdir in R, R + 1, ..., N, 1, ... R - 1 order.
2381          * (every client has rank R)
2382          *      But ll_readdir() expect offset range [0 to MAX_HASH/N) but
2383          * since client ask dir from MDS{R} client has pages with offsets
2384          * [R*MAX_HASH/N ... (R + 1)*MAX_HASH/N] there for we do hash_adj
2385          * on hash  values that we get.
2386          */
2387         obj = lmv_object_find_lock(obd, fid);
2388         if (obj) {
2389                 nr       = obj->lo_objcount;
2390                 LASSERT(nr > 0);
2391                 seg_size = MAX_HASH_SIZE;
2392                 do_div(seg_size, nr);
2393                 los      = obj->lo_stripes;
2394                 tgt      = lmv_get_target(lmv, los[0].ls_mds);
2395                 rank     = lmv_node_rank(tgt->ltd_exp, fid) % nr;
2396                 tgt_tmp  = offset;
2397                 do_div(tgt_tmp, seg_size);
2398                 tgt0_idx = do_div(tgt_tmp,  nr);
2399                 tgt_idx  = (tgt0_idx + rank) % nr;
2400
2401                 if (tgt_idx < tgt0_idx)
2402                         /*
2403                          * Wrap around.
2404                          *
2405                          * Last segment has unusual length due to division
2406                          * rounding.
2407                          */
2408                         hash_adj = MAX_HASH_SIZE - seg_size * nr;
2409                 else
2410                         hash_adj = 0;
2411
2412                 hash_adj += rank * seg_size;
2413
2414                 CDEBUG(D_INODE, "Readpage hash adjustment: %x "LPX64" "
2415                        LPX64"/%x -> "LPX64"/%x\n", rank, hash_adj,
2416                        offset, tgt0_idx, offset + hash_adj, tgt_idx);
2417
2418                 offset = (offset + hash_adj) & MAX_HASH_SIZE;
2419                 rid = obj->lo_stripes[tgt_idx].ls_fid;
2420                 tgt = lmv_get_target(lmv, los[tgt_idx].ls_mds);
2421
2422                 CDEBUG(D_INODE, "Forward to "DFID" with offset %lu i %d\n",
2423                        PFID(&rid), (unsigned long)offset, tgt_idx);
2424         } else
2425                 tgt = lmv_find_target(lmv, &rid);
2426
2427         if (IS_ERR(tgt))
2428                 GOTO(cleanup, rc = PTR_ERR(tgt));
2429
2430         rc = md_readpage(tgt->ltd_exp, &rid, oc, offset, page, request);
2431         if (rc)
2432                 GOTO(cleanup, rc);
2433         if (obj) {
2434                 dp = cfs_kmap(page);
2435
2436                 lmv_hash_adjust(&dp->ldp_hash_start, hash_adj);
2437                 lmv_hash_adjust(&dp->ldp_hash_end,   hash_adj);
2438                 LASSERT(le64_to_cpu(dp->ldp_hash_start) <= offset64);
2439
2440                 for (ent = lu_dirent_start(dp); ent != NULL;
2441                      ent = lu_dirent_next(ent))
2442                         lmv_hash_adjust(&ent->lde_hash, hash_adj);
2443
2444                 if (tgt0_idx != nr - 1) {
2445                         __u64 end;
2446
2447                         end = le64_to_cpu(dp->ldp_hash_end);
2448                         if (end == DIR_END_OFF) {
2449                                 dp->ldp_hash_end = cpu_to_le32(seg_size *
2450                                                                (tgt0_idx + 1));
2451                                 CDEBUG(D_INODE,
2452                                        ""DFID" reset end "LPX64" tgt %d\n",
2453                                        PFID(&rid),
2454                                        (__u64)le64_to_cpu(dp->ldp_hash_end), tgt_idx);
2455                         }
2456                 }
2457                 cfs_kunmap(page);
2458         }
2459         EXIT;
2460 cleanup:
2461         if (obj)
2462                 lmv_object_put_unlock(obj);
2463         return rc;
2464 }
2465
2466 static int lmv_unlink(struct obd_export *exp, struct md_op_data *op_data,
2467                       struct ptlrpc_request **request)
2468 {
2469         struct obd_device       *obd = exp->exp_obd;
2470         struct lmv_obd          *lmv = &obd->u.lmv;
2471         struct lmv_tgt_desc     *tgt = NULL;
2472         struct lmv_object       *obj;
2473         int                      rc;
2474         int                      sidx;
2475         int                      loop = 0;
2476         ENTRY;
2477
2478         rc = lmv_check_connect(obd);
2479         if (rc)
2480                 RETURN(rc);
2481
2482 repeat:
2483         ++loop;
2484         LASSERT(loop <= 2);
2485         LASSERT(op_data->op_namelen != 0);
2486
2487         obj = lmv_object_find(obd, &op_data->op_fid1);
2488         if (obj) {
2489                 sidx = raw_name2idx(obj->lo_hashtype,
2490                                     obj->lo_objcount,
2491                                     op_data->op_name,
2492                                     op_data->op_namelen);
2493                 op_data->op_bias &= ~MDS_CHECK_SPLIT;
2494                 op_data->op_fid1 = obj->lo_stripes[sidx].ls_fid;
2495                 tgt = lmv_get_target(lmv,
2496                                      obj->lo_stripes[sidx].ls_mds);
2497                 lmv_object_put(obj);
2498                 CDEBUG(D_INODE, "UNLINK '%*s' in "DFID" -> %u\n",
2499                        op_data->op_namelen, op_data->op_name,
2500                        PFID(&op_data->op_fid1), sidx);
2501         }
2502
2503         if (tgt == NULL) {
2504                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
2505                 if (IS_ERR(tgt))
2506                         RETURN(PTR_ERR(tgt));
2507                 op_data->op_bias |= MDS_CHECK_SPLIT;
2508         }
2509
2510         op_data->op_fsuid = cfs_curproc_fsuid();
2511         op_data->op_fsgid = cfs_curproc_fsgid();
2512         op_data->op_cap = cfs_curproc_cap_pack();
2513
2514         /*
2515          * If child's fid is given, cancel unused locks for it if it is from
2516          * another export than parent.
2517          *
2518          * LOOKUP lock for child (fid3) should also be cancelled on parent
2519          * tgt_tgt in mdc_unlink().
2520          */
2521         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2522
2523         /*
2524          * Cancel FULL locks on child (fid3).
2525          */
2526         rc = lmv_early_cancel(exp, op_data, tgt->ltd_idx, LCK_EX,
2527                               MDS_INODELOCK_FULL, MF_MDC_CANCEL_FID3);
2528
2529         if (rc == 0)
2530                 rc = md_unlink(tgt->ltd_exp, op_data, request);
2531
2532         if (rc == -ERESTART) {
2533                 LASSERT(*request != NULL);
2534                 DEBUG_REQ(D_WARNING|D_RPCTRACE, *request,
2535                           "Got -ERESTART during unlink!\n");
2536                 ptlrpc_req_finished(*request);
2537                 *request = NULL;
2538
2539                 /*
2540                  * Directory got split. Time to update local object and repeat
2541                  * the request with proper MDS.
2542                  */
2543                 rc = lmv_handle_split(exp, &op_data->op_fid1);
2544                 if (rc == 0)
2545                         goto repeat;
2546         }
2547         RETURN(rc);
2548 }
2549
2550 static int lmv_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
2551 {
2552         int        rc = 0;
2553
2554         switch (stage) {
2555         case OBD_CLEANUP_EARLY:
2556                 /* XXX: here should be calling obd_precleanup() down to
2557                  * stack. */
2558                 break;
2559         case OBD_CLEANUP_EXPORTS:
2560                 rc = obd_llog_finish(obd, 0);
2561                 if (rc != 0)
2562                         CERROR("failed to cleanup llogging subsystems\n");
2563                 break;
2564         default:
2565                 break;
2566         }
2567         RETURN(rc);
2568 }
2569
2570 static int lmv_get_info(struct obd_export *exp, __u32 keylen,
2571                         void *key, __u32 *vallen, void *val,
2572                         struct lov_stripe_md *lsm)
2573 {
2574         struct obd_device       *obd;
2575         struct lmv_obd          *lmv;
2576         int                      rc = 0;
2577         ENTRY;
2578
2579         obd = class_exp2obd(exp);
2580         if (obd == NULL) {
2581                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2582                        exp->exp_handle.h_cookie);
2583                 RETURN(-EINVAL);
2584         }
2585
2586         lmv = &obd->u.lmv;
2587         if (keylen >= strlen("remote_flag") && !strcmp(key, "remote_flag")) {
2588                 struct lmv_tgt_desc *tgts;
2589                 int i;
2590
2591                 rc = lmv_check_connect(obd);
2592                 if (rc)
2593                         RETURN(rc);
2594
2595                 LASSERT(*vallen == sizeof(__u32));
2596                 for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count;
2597                      i++, tgts++) {
2598
2599                         /*
2600                          * All tgts should be connected when this gets called.
2601                          */
2602                         if (!tgts || !tgts->ltd_exp) {
2603                                 CERROR("target not setup?\n");
2604                                 continue;
2605                         }
2606
2607                         if (!obd_get_info(tgts->ltd_exp, keylen, key,
2608                                           vallen, val, NULL))
2609                                 RETURN(0);
2610                 }
2611                 RETURN(-EINVAL);
2612         } else if (KEY_IS(KEY_MAX_EASIZE) || KEY_IS(KEY_CONN_DATA)) {
2613                 rc = lmv_check_connect(obd);
2614                 if (rc)
2615                         RETURN(rc);
2616
2617                 /*
2618                  * Forwarding this request to first MDS, it should know LOV
2619                  * desc.
2620                  */
2621                 rc = obd_get_info(lmv->tgts[0].ltd_exp, keylen, key,
2622                                   vallen, val, NULL);
2623                 if (!rc && KEY_IS(KEY_CONN_DATA)) {
2624                         exp->exp_connect_flags =
2625                         ((struct obd_connect_data *)val)->ocd_connect_flags;
2626                 }
2627                 RETURN(rc);
2628         }
2629
2630         CDEBUG(D_IOCTL, "Invalid key\n");
2631         RETURN(-EINVAL);
2632 }
2633
2634 int lmv_set_info_async(struct obd_export *exp, obd_count keylen,
2635                        void *key, obd_count vallen, void *val,
2636                        struct ptlrpc_request_set *set)
2637 {
2638         struct lmv_tgt_desc    *tgt;
2639         struct obd_device      *obd;
2640         struct lmv_obd         *lmv;
2641         int rc = 0;
2642         ENTRY;
2643
2644         obd = class_exp2obd(exp);
2645         if (obd == NULL) {
2646                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2647                        exp->exp_handle.h_cookie);
2648                 RETURN(-EINVAL);
2649         }
2650         lmv = &obd->u.lmv;
2651
2652         if (KEY_IS(KEY_READ_ONLY) || KEY_IS(KEY_FLUSH_CTX)) {
2653                 int i, err = 0;
2654
2655                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2656                         tgt = &lmv->tgts[i];
2657
2658                         if (!tgt->ltd_exp)
2659                                 continue;
2660
2661                         err = obd_set_info_async(tgt->ltd_exp,
2662                                                  keylen, key, vallen, val, set);
2663                         if (err && rc == 0)
2664                                 rc = err;
2665                 }
2666
2667                 RETURN(rc);
2668         }
2669
2670         RETURN(-EINVAL);
2671 }
2672
2673 int lmv_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
2674                struct lov_stripe_md *lsm)
2675 {
2676         struct obd_device         *obd = class_exp2obd(exp);
2677         struct lmv_obd            *lmv = &obd->u.lmv;
2678         struct lmv_stripe_md      *meap;
2679         struct lmv_stripe_md      *lsmp;
2680         int                        mea_size;
2681         int                        i;
2682         ENTRY;
2683
2684         mea_size = lmv_get_easize(lmv);
2685         if (!lmmp)
2686                 RETURN(mea_size);
2687
2688         if (*lmmp && !lsm) {
2689                 OBD_FREE(*lmmp, mea_size);
2690                 *lmmp = NULL;
2691                 RETURN(0);
2692         }
2693
2694         if (*lmmp == NULL) {
2695                 OBD_ALLOC(*lmmp, mea_size);
2696                 if (*lmmp == NULL)
2697                         RETURN(-ENOMEM);
2698         }
2699
2700         if (!lsm)
2701                 RETURN(mea_size);
2702
2703         lsmp = (struct lmv_stripe_md *)lsm;
2704         meap = (struct lmv_stripe_md *)*lmmp;
2705
2706         if (lsmp->mea_magic != MEA_MAGIC_LAST_CHAR &&
2707             lsmp->mea_magic != MEA_MAGIC_ALL_CHARS)
2708                 RETURN(-EINVAL);
2709
2710         meap->mea_magic = cpu_to_le32(lsmp->mea_magic);
2711         meap->mea_count = cpu_to_le32(lsmp->mea_count);
2712         meap->mea_master = cpu_to_le32(lsmp->mea_master);
2713
2714         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2715                 meap->mea_ids[i] = meap->mea_ids[i];
2716                 fid_cpu_to_le(&meap->mea_ids[i], &meap->mea_ids[i]);
2717         }
2718
2719         RETURN(mea_size);
2720 }
2721
2722 int lmv_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
2723                  struct lov_mds_md *lmm, int lmm_size)
2724 {
2725         struct obd_device          *obd = class_exp2obd(exp);
2726         struct lmv_stripe_md      **tmea = (struct lmv_stripe_md **)lsmp;
2727         struct lmv_stripe_md       *mea = (struct lmv_stripe_md *)lmm;
2728         struct lmv_obd             *lmv = &obd->u.lmv;
2729         int                         mea_size;
2730         int                         i;
2731         __u32                       magic;
2732         ENTRY;
2733
2734         mea_size = lmv_get_easize(lmv);
2735         if (lsmp == NULL)
2736                 return mea_size;
2737
2738         if (*lsmp != NULL && lmm == NULL) {
2739                 OBD_FREE(*tmea, mea_size);
2740                 *lsmp = NULL;
2741                 RETURN(0);
2742         }
2743
2744         LASSERT(mea_size == lmm_size);
2745
2746         OBD_ALLOC(*tmea, mea_size);
2747         if (*tmea == NULL)
2748                 RETURN(-ENOMEM);
2749
2750         if (!lmm)
2751                 RETURN(mea_size);
2752
2753         if (mea->mea_magic == MEA_MAGIC_LAST_CHAR ||
2754             mea->mea_magic == MEA_MAGIC_ALL_CHARS ||
2755             mea->mea_magic == MEA_MAGIC_HASH_SEGMENT)
2756         {
2757                 magic = le32_to_cpu(mea->mea_magic);
2758         } else {
2759                 /*
2760                  * Old mea is not handled here.
2761                  */
2762                 CERROR("Old not supportable EA is found\n");
2763                 LBUG();
2764         }
2765
2766         (*tmea)->mea_magic = magic;
2767         (*tmea)->mea_count = le32_to_cpu(mea->mea_count);
2768         (*tmea)->mea_master = le32_to_cpu(mea->mea_master);
2769
2770         for (i = 0; i < (*tmea)->mea_count; i++) {
2771                 (*tmea)->mea_ids[i] = mea->mea_ids[i];
2772                 fid_le_to_cpu(&(*tmea)->mea_ids[i], &(*tmea)->mea_ids[i]);
2773         }
2774         RETURN(mea_size);
2775 }
2776
2777 static int lmv_cancel_unused(struct obd_export *exp, const struct lu_fid *fid,
2778                              ldlm_policy_data_t *policy, ldlm_mode_t mode,
2779                              ldlm_cancel_flags_t flags, void *opaque)
2780 {
2781         struct obd_device       *obd = exp->exp_obd;
2782         struct lmv_obd          *lmv = &obd->u.lmv;
2783         int                      rc = 0;
2784         int                      err;
2785         int                      i;
2786         ENTRY;
2787
2788         LASSERT(fid != NULL);
2789
2790         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2791                 if (!lmv->tgts[i].ltd_exp || !lmv->tgts[i].ltd_active)
2792                         continue;
2793
2794                 err = md_cancel_unused(lmv->tgts[i].ltd_exp, fid,
2795                                        policy, mode, flags, opaque);
2796                 if (!rc)
2797                         rc = err;
2798         }
2799         RETURN(rc);
2800 }
2801
2802 int lmv_set_lock_data(struct obd_export *exp, __u64 *lockh, void *data,
2803                       __u32 *bits)
2804 {
2805         struct obd_device       *obd = exp->exp_obd;
2806         struct lmv_obd          *lmv = &obd->u.lmv;
2807         int                      rc;
2808         ENTRY;
2809
2810         rc =  md_set_lock_data(lmv->tgts[0].ltd_exp, lockh, data, bits);
2811         RETURN(rc);
2812 }
2813
2814 ldlm_mode_t lmv_lock_match(struct obd_export *exp, int flags,
2815                            const struct lu_fid *fid, ldlm_type_t type,
2816                            ldlm_policy_data_t *policy, ldlm_mode_t mode,
2817                            struct lustre_handle *lockh)
2818 {
2819         struct obd_device       *obd = exp->exp_obd;
2820         struct lmv_obd          *lmv = &obd->u.lmv;
2821         ldlm_mode_t              rc;
2822         int                      i;
2823         ENTRY;
2824
2825         CDEBUG(D_INODE, "Lock match for "DFID"\n", PFID(fid));
2826
2827         /*
2828          * With CMD every object can have two locks in different namespaces:
2829          * lookup lock in space of mds storing direntry and update/open lock in
2830          * space of mds storing inode. Thus we check all targets, not only that
2831          * one fid was created in.
2832          */
2833         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2834                 rc = md_lock_match(lmv->tgts[i].ltd_exp, flags, fid,
2835                                    type, policy, mode, lockh);
2836                 if (rc)
2837                         RETURN(rc);
2838         }
2839
2840         RETURN(0);
2841 }
2842
2843 int lmv_get_lustre_md(struct obd_export *exp, struct ptlrpc_request *req,
2844                       struct obd_export *dt_exp, struct obd_export *md_exp,
2845                       struct lustre_md *md)
2846 {
2847         struct obd_device       *obd = exp->exp_obd;
2848         struct lmv_obd          *lmv = &obd->u.lmv;
2849         int                      rc;
2850         ENTRY;
2851         rc = md_get_lustre_md(lmv->tgts[0].ltd_exp, req, dt_exp, md_exp, md);
2852         RETURN(rc);
2853 }
2854
2855 int lmv_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
2856 {
2857         struct obd_device       *obd = exp->exp_obd;
2858         struct lmv_obd          *lmv = &obd->u.lmv;
2859         ENTRY;
2860
2861         if (md->mea)
2862                 obd_free_memmd(exp, (void *)&md->mea);
2863         RETURN(md_free_lustre_md(lmv->tgts[0].ltd_exp, md));
2864 }
2865
2866 int lmv_set_open_replay_data(struct obd_export *exp,
2867                              struct obd_client_handle *och,
2868                              struct ptlrpc_request *open_req)
2869 {
2870         struct obd_device       *obd = exp->exp_obd;
2871         struct lmv_obd          *lmv = &obd->u.lmv;
2872         struct lmv_tgt_desc     *tgt;
2873         ENTRY;
2874
2875         tgt = lmv_find_target(lmv, &och->och_fid);
2876         if (IS_ERR(tgt))
2877                 RETURN(PTR_ERR(tgt));
2878
2879         RETURN(md_set_open_replay_data(tgt->ltd_exp, och, open_req));
2880 }
2881
2882 int lmv_clear_open_replay_data(struct obd_export *exp,
2883                                struct obd_client_handle *och)
2884 {
2885         struct obd_device       *obd = exp->exp_obd;
2886         struct lmv_obd          *lmv = &obd->u.lmv;
2887         struct lmv_tgt_desc     *tgt;
2888         ENTRY;
2889
2890         tgt = lmv_find_target(lmv, &och->och_fid);
2891         if (IS_ERR(tgt))
2892                 RETURN(PTR_ERR(tgt));
2893
2894         RETURN(md_clear_open_replay_data(tgt->ltd_exp, och));
2895 }
2896
2897 static int lmv_get_remote_perm(struct obd_export *exp,
2898                                const struct lu_fid *fid,
2899                                struct obd_capa *oc, __u32 suppgid,
2900                                struct ptlrpc_request **request)
2901 {
2902         struct obd_device       *obd = exp->exp_obd;
2903         struct lmv_obd          *lmv = &obd->u.lmv;
2904         struct lmv_tgt_desc     *tgt;
2905         int                      rc;
2906         ENTRY;
2907
2908         rc = lmv_check_connect(obd);
2909         if (rc)
2910                 RETURN(rc);
2911
2912         tgt = lmv_find_target(lmv, fid);
2913         if (IS_ERR(tgt))
2914                 RETURN(PTR_ERR(tgt));
2915
2916         rc = md_get_remote_perm(tgt->ltd_exp, fid, oc, suppgid, request);
2917         RETURN(rc);
2918 }
2919
2920 static int lmv_renew_capa(struct obd_export *exp, struct obd_capa *oc,
2921                           renew_capa_cb_t cb)
2922 {
2923         struct obd_device       *obd = exp->exp_obd;
2924         struct lmv_obd          *lmv = &obd->u.lmv;
2925         struct lmv_tgt_desc     *tgt;
2926         int                      rc;
2927         ENTRY;
2928
2929         rc = lmv_check_connect(obd);
2930         if (rc)
2931                 RETURN(rc);
2932
2933         tgt = lmv_find_target(lmv, &oc->c_capa.lc_fid);
2934         if (IS_ERR(tgt))
2935                 RETURN(PTR_ERR(tgt));
2936
2937         rc = md_renew_capa(tgt->ltd_exp, oc, cb);
2938         RETURN(rc);
2939 }
2940
2941 int lmv_unpack_capa(struct obd_export *exp, struct ptlrpc_request *req,
2942                     const struct req_msg_field *field, struct obd_capa **oc)
2943 {
2944         struct obd_device *obd = exp->exp_obd;
2945         struct lmv_obd *lmv = &obd->u.lmv;
2946         int rc;
2947
2948         ENTRY;
2949         rc = md_unpack_capa(lmv->tgts[0].ltd_exp, req, field, oc);
2950         RETURN(rc);
2951 }
2952
2953 int lmv_intent_getattr_async(struct obd_export *exp,
2954                              struct md_enqueue_info *minfo,
2955                              struct ldlm_enqueue_info *einfo)
2956 {
2957         struct md_op_data       *op_data = &minfo->mi_data;
2958         struct obd_device       *obd = exp->exp_obd;
2959         struct lmv_obd          *lmv = &obd->u.lmv;
2960         struct lmv_object       *obj;
2961         struct lmv_tgt_desc     *tgt;
2962         int                      rc;
2963         int                      sidx;
2964         ENTRY;
2965
2966         rc = lmv_check_connect(obd);
2967         if (rc)
2968                 RETURN(rc);
2969
2970         if (!fid_is_sane(&op_data->op_fid2)) {
2971                 obj = lmv_object_find(obd, &op_data->op_fid1);
2972                 if (obj && op_data->op_namelen) {
2973                         sidx = raw_name2idx(obj->lo_hashtype,
2974                                             obj->lo_objcount,
2975                                             (char *)op_data->op_name,
2976                                             op_data->op_namelen);
2977                         op_data->op_fid1 = obj->lo_stripes[sidx].ls_fid;
2978                         tgt = lmv_get_target(lmv,
2979                                              obj->lo_stripes[sidx].ls_mds);
2980                         CDEBUG(D_INODE,
2981                                "Choose slave dir ("DFID") -> mds #%d\n",
2982                                PFID(&op_data->op_fid1), tgt->ltd_idx);
2983                 } else {
2984                         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2985                 }
2986                 if (obj)
2987                         lmv_object_put(obj);
2988         } else {
2989                 op_data->op_fid1 = op_data->op_fid2;
2990                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
2991                 op_data->op_bias = MDS_CROSS_REF;
2992                 /*
2993                  * Unfortunately, we have to lie to MDC/MDS to retrieve
2994                  * attributes llite needs.
2995                 */
2996                 if (minfo->mi_it.it_op & IT_LOOKUP)
2997                         minfo->mi_it.it_op = IT_GETATTR;
2998         }
2999
3000         if (IS_ERR(tgt))
3001                 RETURN(PTR_ERR(tgt));
3002
3003         rc = md_intent_getattr_async(tgt->ltd_exp, minfo, einfo);
3004         RETURN(rc);
3005 }
3006
3007 int lmv_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
3008                         struct lu_fid *fid, __u32 *bits)
3009 {
3010         struct obd_device       *obd = exp->exp_obd;
3011         struct lmv_obd          *lmv = &obd->u.lmv;
3012         struct lmv_tgt_desc     *tgt;
3013         int                      rc;
3014         ENTRY;
3015
3016         rc = lmv_check_connect(obd);
3017         if (rc)
3018                 RETURN(rc);
3019
3020         tgt = lmv_find_target(lmv, fid);
3021         if (IS_ERR(tgt))
3022                 RETURN(PTR_ERR(tgt));
3023
3024         rc = md_revalidate_lock(tgt->ltd_exp, it, fid, bits);
3025         RETURN(rc);
3026 }
3027
3028
3029 struct obd_ops lmv_obd_ops = {
3030         .o_owner                = THIS_MODULE,
3031         .o_setup                = lmv_setup,
3032         .o_cleanup              = lmv_cleanup,
3033         .o_precleanup           = lmv_precleanup,
3034         .o_process_config       = lmv_process_config,
3035         .o_connect              = lmv_connect,
3036         .o_disconnect           = lmv_disconnect,
3037         .o_statfs               = lmv_statfs,
3038         .o_get_info             = lmv_get_info,
3039         .o_set_info_async       = lmv_set_info_async,
3040         .o_packmd               = lmv_packmd,
3041         .o_unpackmd             = lmv_unpackmd,
3042         .o_notify               = lmv_notify,
3043         .o_get_uuid             = lmv_get_uuid,
3044         .o_iocontrol            = lmv_iocontrol,
3045         .o_fid_delete           = lmv_fid_delete
3046 };
3047
3048 struct md_ops lmv_md_ops = {
3049         .m_getstatus            = lmv_getstatus,
3050         .m_change_cbdata        = lmv_change_cbdata,
3051         .m_find_cbdata          = lmv_find_cbdata,
3052         .m_close                = lmv_close,
3053         .m_create               = lmv_create,
3054         .m_done_writing         = lmv_done_writing,
3055         .m_enqueue              = lmv_enqueue,
3056         .m_getattr              = lmv_getattr,
3057         .m_getxattr             = lmv_getxattr,
3058         .m_getattr_name         = lmv_getattr_name,
3059         .m_intent_lock          = lmv_intent_lock,
3060         .m_link                 = lmv_link,
3061         .m_rename               = lmv_rename,
3062         .m_setattr              = lmv_setattr,
3063         .m_setxattr             = lmv_setxattr,
3064         .m_sync                 = lmv_sync,
3065         .m_readpage             = lmv_readpage,
3066         .m_unlink               = lmv_unlink,
3067         .m_init_ea_size         = lmv_init_ea_size,
3068         .m_cancel_unused        = lmv_cancel_unused,
3069         .m_set_lock_data        = lmv_set_lock_data,
3070         .m_lock_match           = lmv_lock_match,
3071         .m_get_lustre_md        = lmv_get_lustre_md,
3072         .m_free_lustre_md       = lmv_free_lustre_md,
3073         .m_set_open_replay_data = lmv_set_open_replay_data,
3074         .m_clear_open_replay_data = lmv_clear_open_replay_data,
3075         .m_renew_capa           = lmv_renew_capa,
3076         .m_unpack_capa          = lmv_unpack_capa,
3077         .m_get_remote_perm      = lmv_get_remote_perm,
3078         .m_intent_getattr_async = lmv_intent_getattr_async,
3079         .m_revalidate_lock      = lmv_revalidate_lock
3080 };
3081
3082 static quota_interface_t *quota_interface;
3083 extern quota_interface_t lmv_quota_interface;
3084
3085 int __init lmv_init(void)
3086 {
3087         struct lprocfs_static_vars lvars;
3088         int                        rc;
3089
3090         lmv_object_cache = cfs_mem_cache_create("lmv_objects",
3091                                                 sizeof(struct lmv_object),
3092                                                 0, 0);
3093         if (!lmv_object_cache) {
3094                 CERROR("Error allocating lmv objects cache\n");
3095                 return -ENOMEM;
3096         }
3097
3098         lprocfs_lmv_init_vars(&lvars);
3099
3100         cfs_request_module("lquota");
3101         quota_interface = PORTAL_SYMBOL_GET(lmv_quota_interface);
3102         init_obd_quota_ops(quota_interface, &lmv_obd_ops);
3103
3104         rc = class_register_type(&lmv_obd_ops, &lmv_md_ops,
3105                                  lvars.module_vars, LUSTRE_LMV_NAME, NULL);
3106         if (rc) {
3107                 if (quota_interface)
3108                         PORTAL_SYMBOL_PUT(lmv_quota_interface);
3109                 cfs_mem_cache_destroy(lmv_object_cache);
3110         }
3111
3112         return rc;
3113 }
3114
3115 #ifdef __KERNEL__
3116 static void lmv_exit(void)
3117 {
3118         if (quota_interface)
3119                 PORTAL_SYMBOL_PUT(lmv_quota_interface);
3120
3121         class_unregister_type(LUSTRE_LMV_NAME);
3122
3123         LASSERTF(cfs_atomic_read(&lmv_object_count) == 0,
3124                  "Can't free lmv objects cache, %d object(s) busy\n",
3125                  cfs_atomic_read(&lmv_object_count));
3126         cfs_mem_cache_destroy(lmv_object_cache);
3127 }
3128
3129 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
3130 MODULE_DESCRIPTION("Lustre Logical Metadata Volume OBD driver");
3131 MODULE_LICENSE("GPL");
3132
3133 module_init(lmv_init);
3134 module_exit(lmv_exit);
3135 #endif