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  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  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/lustre_idl.h>
  56 #include <lustre_log.h>
  57 #include <obd_support.h>
  58 #include <lustre_lib.h>
  59 #include <lustre_net.h>
  60 #include <obd_class.h>
  61 #include <lprocfs_status.h>
  62 #include <lustre_lite.h>
  63 #include <lustre_fid.h>
  64 #include "lmv_internal.h"
  65
  66 /* object cache. */
  67 cfs_mem_cache_t *lmv_object_cache;
  68 cfs_atomic_t lmv_object_count = CFS_ATOMIC_INIT(0);
  69
  70 static void lmv_activate_target(struct lmv_obd *lmv,
  71                                 struct lmv_tgt_desc *tgt,
  72                                 int activate)
  73 {
  74         if (tgt->ltd_active == activate)
  75                 return;
  76
  77         tgt->ltd_active = activate;
  78         lmv->desc.ld_active_tgt_count += (activate ? 1 : -1);
  79 }
  80
  81 /**
  82  * Error codes:
  83  *
  84  *  -EINVAL  : UUID can't be found in the LMV's target list
  85  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
  86  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
  87  */
  88 static int lmv_set_mdc_active(struct lmv_obd *lmv, struct obd_uuid *uuid,
  89                               int activate)
  90 {
  91         struct lmv_tgt_desc    *tgt;
  92         struct obd_device      *obd;
  93         int                     i;
  94         int                     rc = 0;
  95         ENTRY;
  96
  97         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
  98                lmv, uuid->uuid, activate);
  99
 100         cfs_spin_lock(&lmv->lmv_lock);
 101         for (i = 0, tgt = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgt++) {
 102                 if (tgt->ltd_exp == NULL)
 103                         continue;
 104
 105                 CDEBUG(D_INFO, "Target idx %d is %s conn "LPX64"\n",
 106                        i, tgt->ltd_uuid.uuid, tgt->ltd_exp->exp_handle.h_cookie);
 107
 108                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 109                         break;
 110         }
 111
 112         if (i == lmv->desc.ld_tgt_count)
 113                 GOTO(out_lmv_lock, rc = -EINVAL);
 114
 115         obd = class_exp2obd(tgt->ltd_exp);
 116         if (obd == NULL)
 117                 GOTO(out_lmv_lock, rc = -ENOTCONN);
 118
 119         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
 120                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
 121                obd->obd_type->typ_name, i);
 122         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0);
 123
 124         if (tgt->ltd_active == activate) {
 125                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
 126                        activate ? "" : "in");
 127                 GOTO(out_lmv_lock, rc);
 128         }
 129
 130         CDEBUG(D_INFO, "Marking OBD %p %sactive\n", obd,
 131                activate ? "" : "in");
 132         lmv_activate_target(lmv, tgt, activate);
 133         EXIT;
 134
 135  out_lmv_lock:
 136         cfs_spin_unlock(&lmv->lmv_lock);
 137         return rc;
 138 }
 139
 140 static int lmv_set_mdc_data(struct lmv_obd *lmv, struct obd_uuid *uuid,
 141                             struct obd_connect_data *data)
 142 {
 143         struct lmv_tgt_desc    *tgt;
 144         int                     i;
 145         ENTRY;
 146
 147         LASSERT(data != NULL);
 148
 149         cfs_spin_lock(&lmv->lmv_lock);
 150         for (i = 0, tgt = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgt++) {
 151                 if (tgt->ltd_exp == NULL)
 152                         continue;
 153
 154                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid)) {
 155                         lmv->datas[tgt->ltd_idx] = *data;
 156                         break;
 157                 }
 158         }
 159         cfs_spin_unlock(&lmv->lmv_lock);
 160         RETURN(0);
 161 }
 162
 163 struct obd_uuid *lmv_get_uuid(struct obd_export *exp) {
 164         struct obd_device *obd = exp->exp_obd;
 165         struct lmv_obd *lmv = &obd->u.lmv;
 166         return obd_get_uuid(lmv->tgts[0].ltd_exp);
 167 }
 168
 169 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
 170                       enum obd_notify_event ev, void *data)
 171 {
 172         struct obd_connect_data *conn_data;
 173         struct lmv_obd          *lmv = &obd->u.lmv;
 174         struct obd_uuid         *uuid;
 175         int                      rc = 0;
 176         ENTRY;
 177
 178         if (strcmp(watched->obd_type->typ_name, LUSTRE_MDC_NAME)) {
 179                 CERROR("unexpected notification of %s %s!\n",
 180                        watched->obd_type->typ_name,
 181                        watched->obd_name);
 182                 RETURN(-EINVAL);
 183         }
 184
 185         uuid = &watched->u.cli.cl_target_uuid;
 186         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE) {
 187                 /*
 188                  * Set MDC as active before notifying the observer, so the
 189                  * observer can use the MDC normally.
 190                  */
 191                 rc = lmv_set_mdc_active(lmv, uuid,
 192                                         ev == OBD_NOTIFY_ACTIVE);
 193                 if (rc) {
 194                         CERROR("%sactivation of %s failed: %d\n",
 195                                ev == OBD_NOTIFY_ACTIVE ? "" : "de",
 196                                uuid->uuid, rc);
 197                         RETURN(rc);
 198                 }
 199         } else if (ev == OBD_NOTIFY_OCD) {
 200                 conn_data = &watched->u.cli.cl_import->imp_connect_data;
 201
 202                 /*
 203                  * Set connect data to desired target, update exp_connect_flags.
 204                  */
 205                 rc = lmv_set_mdc_data(lmv, uuid, conn_data);
 206                 if (rc) {
 207                         CERROR("can't set connect data to target %s, rc %d\n",
 208                                uuid->uuid, rc);
 209                         RETURN(rc);
 210                 }
 211
 212                 /*
 213                  * XXX: Make sure that ocd_connect_flags from all targets are
 214                  * the same. Otherwise one of MDTs runs wrong version or
 215                  * something like this.  --umka
 216                  */
 217                 obd->obd_self_export->exp_connect_flags =
 218                         conn_data->ocd_connect_flags;
 219         }
 220 #if 0
 221         else if (ev == OBD_NOTIFY_DISCON) {
 222                 /*
 223                  * For disconnect event, flush fld cache for failout MDS case.
 224                  */
 225                 fld_client_flush(&lmv->lmv_fld);
 226         }
 227 #endif
 228         /*
 229          * Pass the notification up the chain.
 230          */
 231         if (obd->obd_observer)
 232                 rc = obd_notify(obd->obd_observer, watched, ev, data);
 233
 234         RETURN(rc);
 235 }
 236
 237 /**
 238  * This is fake connect function. Its purpose is to initialize lmv and say
 239  * caller that everything is okay. Real connection will be performed later.
 240  */
 241 static int lmv_connect(const struct lu_env *env,
 242                        struct obd_export **exp, struct obd_device *obd,
 243                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 244                        void *localdata)
 245 {
 246 #ifdef __KERNEL__
 247         struct proc_dir_entry *lmv_proc_dir;
 248 #endif
 249         struct lmv_obd        *lmv = &obd->u.lmv;
 250         struct lustre_handle  conn = { 0 };
 251         int                    rc = 0;
 252         ENTRY;
 253
 254         /*
 255          * We don't want to actually do the underlying connections more than
 256          * once, so keep track.
 257          */
 258         lmv->refcount++;
 259         if (lmv->refcount > 1) {
 260                 *exp = NULL;
 261                 RETURN(0);
 262         }
 263
 264         rc = class_connect(&conn, obd, cluuid);
 265         if (rc) {
 266                 CERROR("class_connection() returned %d\n", rc);
 267                 RETURN(rc);
 268         }
 269
 270         *exp = class_conn2export(&conn);
 271         class_export_get(*exp);
 272
 273         lmv->exp = *exp;
 274         lmv->connected = 0;
 275         lmv->cluuid = *cluuid;
 276
 277         if (data)
 278                 lmv->conn_data = *data;
 279
 280 #ifdef __KERNEL__
 281         lmv_proc_dir = lprocfs_register("target_obds", obd->obd_proc_entry,
 282                                         NULL, NULL);
 283         if (IS_ERR(lmv_proc_dir)) {
 284                 CERROR("could not register /proc/fs/lustre/%s/%s/target_obds.",
 285                        obd->obd_type->typ_name, obd->obd_name);
 286                 lmv_proc_dir = NULL;
 287         }
 288 #endif
 289
 290         /*
 291          * All real clients should perform actual connection right away, because
 292          * it is possible, that LMV will not have opportunity to connect targets
 293          * and MDC stuff will be called directly, for instance while reading
 294          * ../mdc/../kbytesfree procfs file, etc.
 295          */
 296         if (data->ocd_connect_flags & OBD_CONNECT_REAL)
 297                 rc = lmv_check_connect(obd);
 298
 299 #ifdef __KERNEL__
 300         if (rc) {
 301                 if (lmv_proc_dir)
 302                         lprocfs_remove(&lmv_proc_dir);
 303         }
 304 #endif
 305
 306         RETURN(rc);
 307 }
 308
 309 static void lmv_set_timeouts(struct obd_device *obd)
 310 {
 311         struct lmv_tgt_desc   *tgts;
 312         struct lmv_obd        *lmv;
 313         int                    i;
 314
 315         lmv = &obd->u.lmv;
 316         if (lmv->server_timeout == 0)
 317                 return;
 318
 319         if (lmv->connected == 0)
 320                 return;
 321
 322         for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgts++) {
 323                 if (tgts->ltd_exp == NULL)
 324                         continue;
 325
 326                 obd_set_info_async(tgts->ltd_exp, sizeof(KEY_INTERMDS),
 327                                    KEY_INTERMDS, 0, NULL, NULL);
 328         }
 329 }
 330
 331 static int lmv_init_ea_size(struct obd_export *exp, int easize,
 332                             int def_easize, int cookiesize)
 333 {
 334         struct obd_device   *obd = exp->exp_obd;
 335         struct lmv_obd      *lmv = &obd->u.lmv;
 336         int                  i;
 337         int                  rc = 0;
 338         int                  change = 0;
 339         ENTRY;
 340
 341         if (lmv->max_easize < easize) {
 342                 lmv->max_easize = easize;
 343                 change = 1;
 344         }
 345         if (lmv->max_def_easize < def_easize) {
 346                 lmv->max_def_easize = def_easize;
 347                 change = 1;
 348         }
 349         if (lmv->max_cookiesize < cookiesize) {
 350                 lmv->max_cookiesize = cookiesize;
 351                 change = 1;
 352         }
 353         if (change == 0)
 354                 RETURN(0);
 355
 356         if (lmv->connected == 0)
 357                 RETURN(0);
 358
 359         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 360                 if (lmv->tgts[i].ltd_exp == NULL) {
 361                         CWARN("%s: NULL export for %d\n", obd->obd_name, i);
 362                         continue;
 363                 }
 364
 365                 rc = md_init_ea_size(lmv->tgts[i].ltd_exp, easize, def_easize,
 366                                      cookiesize);
 367                 if (rc) {
 368                         CERROR("obd_init_ea_size() failed on MDT target %d, "
 369                                "error %d.\n", i, rc);
 370                         break;
 371                 }
 372         }
 373         RETURN(rc);
 374 }
 375
 376 #define MAX_STRING_SIZE 128
 377
 378 int lmv_connect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 379 {
 380 #ifdef __KERNEL__
 381         struct proc_dir_entry   *lmv_proc_dir;
 382 #endif
 383         struct lmv_obd          *lmv = &obd->u.lmv;
 384         struct obd_uuid         *cluuid = &lmv->cluuid;
 385         struct obd_connect_data *mdc_data = NULL;
 386         struct obd_uuid          lmv_mdc_uuid = { "LMV_MDC_UUID" };
 387         struct obd_device       *mdc_obd;
 388         struct obd_export       *mdc_exp;
 389         struct lu_fld_target     target;
 390         int                      rc;
 391         ENTRY;
 392
 393         mdc_obd = class_find_client_obd(&tgt->ltd_uuid, LUSTRE_MDC_NAME,
 394                                         &obd->obd_uuid);
 395         if (!mdc_obd) {
 396                 CERROR("target %s not attached\n", tgt->ltd_uuid.uuid);
 397                 RETURN(-EINVAL);
 398         }
 399
 400         CDEBUG(D_CONFIG, "connect to %s(%s) - %s, %s FOR %s\n",
 401                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 402                 tgt->ltd_uuid.uuid, obd->obd_uuid.uuid,
 403                 cluuid->uuid);
 404
 405         if (!mdc_obd->obd_set_up) {
 406                 CERROR("target %s is not set up\n", tgt->ltd_uuid.uuid);
 407                 RETURN(-EINVAL);
 408         }
 409
 410         rc = obd_connect(NULL, &mdc_exp, mdc_obd, &lmv_mdc_uuid,
 411                          &lmv->conn_data, NULL);
 412         if (rc) {
 413                 CERROR("target %s connect error %d\n", tgt->ltd_uuid.uuid, rc);
 414                 RETURN(rc);
 415         }
 416
 417         /*
 418          * Init fid sequence client for this mdc and add new fld target.
 419          */
 420         rc = obd_fid_init(mdc_exp);
 421         if (rc)
 422                 RETURN(rc);
 423
 424         target.ft_srv = NULL;
 425         target.ft_exp = mdc_exp;
 426         target.ft_idx = tgt->ltd_idx;
 427
 428         fld_client_add_target(&lmv->lmv_fld, &target);
 429
 430         mdc_data = &class_exp2cliimp(mdc_exp)->imp_connect_data;
 431
 432         rc = obd_register_observer(mdc_obd, obd);
 433         if (rc) {
 434                 obd_disconnect(mdc_exp);
 435                 CERROR("target %s register_observer error %d\n",
 436                        tgt->ltd_uuid.uuid, rc);
 437                 RETURN(rc);
 438         }
 439
 440         if (obd->obd_observer) {
 441                 /*
 442                  * Tell the observer about the new target.
 443                  */
 444                 rc = obd_notify(obd->obd_observer, mdc_exp->exp_obd,
 445                                 OBD_NOTIFY_ACTIVE, (void *)(tgt - lmv->tgts));
 446                 if (rc) {
 447                         obd_disconnect(mdc_exp);
 448                         RETURN(rc);
 449                 }
 450         }
 451
 452         tgt->ltd_active = 1;
 453         tgt->ltd_exp = mdc_exp;
 454         lmv->desc.ld_active_tgt_count++;
 455
 456         /*
 457          * Copy connect data, it may be used later.
 458          */
 459         lmv->datas[tgt->ltd_idx] = *mdc_data;
 460
 461         md_init_ea_size(tgt->ltd_exp, lmv->max_easize,
 462                         lmv->max_def_easize, lmv->max_cookiesize);
 463
 464         CDEBUG(D_CONFIG, "Connected to %s(%s) successfully (%d)\n",
 465                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 466                 cfs_atomic_read(&obd->obd_refcount));
 467
 468 #ifdef __KERNEL__
 469         lmv_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 470         if (lmv_proc_dir) {
 471                 struct proc_dir_entry *mdc_symlink;
 472
 473                 LASSERT(mdc_obd->obd_type != NULL);
 474                 LASSERT(mdc_obd->obd_type->typ_name != NULL);
 475                 mdc_symlink = lprocfs_add_symlink(mdc_obd->obd_name,
 476                                                   lmv_proc_dir,
 477                                                   "../../../%s/%s",
 478                                                   mdc_obd->obd_type->typ_name,
 479                                                   mdc_obd->obd_name);
 480                 if (mdc_symlink == NULL) {
 481                         CERROR("Could not register LMV target "
 482                                "/proc/fs/lustre/%s/%s/target_obds/%s.",
 483                                obd->obd_type->typ_name, obd->obd_name,
 484                                mdc_obd->obd_name);
 485                         lprocfs_remove(&lmv_proc_dir);
 486                         lmv_proc_dir = NULL;
 487                 }
 488         }
 489 #endif
 490         RETURN(0);
 491 }
 492
 493 int lmv_add_target(struct obd_device *obd, struct obd_uuid *tgt_uuid)
 494 {
 495         struct lmv_obd      *lmv = &obd->u.lmv;
 496         struct lmv_tgt_desc *tgt;
 497         int                  rc = 0;
 498         ENTRY;
 499
 500         CDEBUG(D_CONFIG, "Target uuid: %s.\n", tgt_uuid->uuid);
 501
 502         lmv_init_lock(lmv);
 503
 504         if (lmv->desc.ld_active_tgt_count >= LMV_MAX_TGT_COUNT) {
 505                 lmv_init_unlock(lmv);
 506                 CERROR("Can't add %s, LMV module compiled for %d MDCs. "
 507                        "That many MDCs already configured.\n",
 508                        tgt_uuid->uuid, LMV_MAX_TGT_COUNT);
 509                 RETURN(-EINVAL);
 510         }
 511         if (lmv->desc.ld_tgt_count == 0) {
 512                 struct obd_device *mdc_obd;
 513
 514                 mdc_obd = class_find_client_obd(tgt_uuid, LUSTRE_MDC_NAME,
 515                                                 &obd->obd_uuid);
 516                 if (!mdc_obd) {
 517                         lmv_init_unlock(lmv);
 518                         CERROR("Target %s not attached\n", tgt_uuid->uuid);
 519                         RETURN(-EINVAL);
 520                 }
 521
 522                 rc = obd_llog_init(obd, &obd->obd_olg, mdc_obd, NULL);
 523                 if (rc) {
 524                         lmv_init_unlock(lmv);
 525                         CERROR("lmv failed to setup llogging subsystems\n");
 526                 }
 527         }
 528         cfs_spin_lock(&lmv->lmv_lock);
 529         tgt = lmv->tgts + lmv->desc.ld_tgt_count++;
 530         tgt->ltd_uuid = *tgt_uuid;
 531         cfs_spin_unlock(&lmv->lmv_lock);
 532
 533         if (lmv->connected) {
 534                 rc = lmv_connect_mdc(obd, tgt);
 535                 if (rc) {
 536                         cfs_spin_lock(&lmv->lmv_lock);
 537                         lmv->desc.ld_tgt_count--;
 538                         memset(tgt, 0, sizeof(*tgt));
 539                         cfs_spin_unlock(&lmv->lmv_lock);
 540                 } else {
 541                         int easize = sizeof(struct lmv_stripe_md) +
 542                                      lmv->desc.ld_tgt_count *
 543                                      sizeof(struct lu_fid);
 544                         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0);
 545                 }
 546         }
 547
 548         lmv_init_unlock(lmv);
 549         RETURN(rc);
 550 }
 551
 552 int lmv_check_connect(struct obd_device *obd)
 553 {
 554         struct lmv_obd       *lmv = &obd->u.lmv;
 555         struct lmv_tgt_desc  *tgt;
 556         int                   i;
 557         int                   rc;
 558         int                   easize;
 559         ENTRY;
 560
 561         if (lmv->connected)
 562                 RETURN(0);
 563
 564         lmv_init_lock(lmv);
 565         if (lmv->connected) {
 566                 lmv_init_unlock(lmv);
 567                 RETURN(0);
 568         }
 569
 570         if (lmv->desc.ld_tgt_count == 0) {
 571                 CERROR("%s: no targets configured.\n", obd->obd_name);
 572                 RETURN(-EINVAL);
 573         }
 574
 575         CDEBUG(D_CONFIG, "Time to connect %s to %s\n",
 576                lmv->cluuid.uuid, obd->obd_name);
 577
 578         LASSERT(lmv->tgts != NULL);
 579
 580         for (i = 0, tgt = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgt++) {
 581                 rc = lmv_connect_mdc(obd, tgt);
 582                 if (rc)
 583                         GOTO(out_disc, rc);
 584         }
 585
 586         lmv_set_timeouts(obd);
 587         class_export_put(lmv->exp);
 588         lmv->connected = 1;
 589         easize = lmv_get_easize(lmv);
 590         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0);
 591         lmv_init_unlock(lmv);
 592         RETURN(0);
 593
 594  out_disc:
 595         while (i-- > 0) {
 596                 int rc2;
 597                 --tgt;
 598                 tgt->ltd_active = 0;
 599                 if (tgt->ltd_exp) {
 600                         --lmv->desc.ld_active_tgt_count;
 601                         rc2 = obd_disconnect(tgt->ltd_exp);
 602                         if (rc2) {
 603                                 CERROR("LMV target %s disconnect on "
 604                                        "MDC idx %d: error %d\n",
 605                                        tgt->ltd_uuid.uuid, i, rc2);
 606                         }
 607                 }
 608         }
 609         class_disconnect(lmv->exp);
 610         lmv_init_unlock(lmv);
 611         RETURN(rc);
 612 }
 613
 614 static int lmv_disconnect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 615 {
 616 #ifdef __KERNEL__
 617         struct proc_dir_entry  *lmv_proc_dir;
 618 #endif
 619         struct lmv_obd         *lmv = &obd->u.lmv;
 620         struct obd_device      *mdc_obd;
 621         int                     rc;
 622         ENTRY;
 623
 624         LASSERT(tgt != NULL);
 625         LASSERT(obd != NULL);
 626
 627         mdc_obd = class_exp2obd(tgt->ltd_exp);
 628
 629         if (mdc_obd)
 630                 mdc_obd->obd_no_recov = obd->obd_no_recov;
 631
 632 #ifdef __KERNEL__
 633         lmv_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 634         if (lmv_proc_dir) {
 635                 struct proc_dir_entry *mdc_symlink;
 636
 637                 mdc_symlink = lprocfs_srch(lmv_proc_dir, mdc_obd->obd_name);
 638                 if (mdc_symlink) {
 639                         lprocfs_remove(&mdc_symlink);
 640                 } else {
 641                         CERROR("/proc/fs/lustre/%s/%s/target_obds/%s missing\n",
 642                                obd->obd_type->typ_name, obd->obd_name,
 643                                mdc_obd->obd_name);
 644                 }
 645         }
 646 #endif
 647         rc = obd_fid_fini(tgt->ltd_exp);
 648         if (rc)
 649                 CERROR("Can't finanize fids factory\n");
 650
 651         CDEBUG(D_INFO, "Disconnected from %s(%s) successfully\n",
 652                tgt->ltd_exp->exp_obd->obd_name,
 653                tgt->ltd_exp->exp_obd->obd_uuid.uuid);
 654
 655         obd_register_observer(tgt->ltd_exp->exp_obd, NULL);
 656         rc = obd_disconnect(tgt->ltd_exp);
 657         if (rc) {
 658                 if (tgt->ltd_active) {
 659                         CERROR("Target %s disconnect error %d\n",
 660                                tgt->ltd_uuid.uuid, rc);
 661                 }
 662         }
 663
 664         lmv_activate_target(lmv, tgt, 0);
 665         tgt->ltd_exp = NULL;
 666         RETURN(0);
 667 }
 668
 669 static int lmv_disconnect(struct obd_export *exp)
 670 {
 671         struct obd_device     *obd = class_exp2obd(exp);
 672 #ifdef __KERNEL__
 673         struct proc_dir_entry *lmv_proc_dir;
 674 #endif
 675         struct lmv_obd        *lmv = &obd->u.lmv;
 676         int                    rc;
 677         int                    i;
 678         ENTRY;
 679
 680         if (!lmv->tgts)
 681                 goto out_local;
 682
 683         /*
 684          * Only disconnect the underlying layers on the final disconnect.
 685          */
 686         lmv->refcount--;
 687         if (lmv->refcount != 0)
 688                 goto out_local;
 689
 690         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 691                 if (lmv->tgts[i].ltd_exp == NULL)
 692                         continue;
 693                 lmv_disconnect_mdc(obd, &lmv->tgts[i]);
 694         }
 695
 696 #ifdef __KERNEL__
 697         lmv_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 698         if (lmv_proc_dir) {
 699                 lprocfs_remove(&lmv_proc_dir);
 700         } else {
 701                 CERROR("/proc/fs/lustre/%s/%s/target_obds missing\n",
 702                        obd->obd_type->typ_name, obd->obd_name);
 703         }
 704 #endif
 705
 706 out_local:
 707         /*
 708          * This is the case when no real connection is established by
 709          * lmv_check_connect().
 710          */
 711         if (!lmv->connected)
 712                 class_export_put(exp);
 713         rc = class_disconnect(exp);
 714         if (lmv->refcount == 0)
 715                 lmv->connected = 0;
 716         RETURN(rc);
 717 }
 718
 719 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
 720                          int len, void *karg, void *uarg)
 721 {
 722         struct obd_device    *obddev = class_exp2obd(exp);
 723         struct lmv_obd       *lmv = &obddev->u.lmv;
 724         int                   i = 0;
 725         int                   rc = 0;
 726         int                   set = 0;
 727         int                   count = lmv->desc.ld_tgt_count;
 728         ENTRY;
 729
 730         if (count == 0)
 731                 RETURN(-ENOTTY);
 732
 733         switch (cmd) {
 734         case IOC_OBD_STATFS: {
 735                 struct obd_ioctl_data *data = karg;
 736                 struct obd_device *mdc_obd;
 737                 struct obd_statfs stat_buf = {0};
 738                 __u32 index;
 739
 740                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
 741                 LASSERT(data->ioc_plen1 == sizeof(struct obd_statfs));
 742
 743                 if ((index >= count))
 744                         RETURN(-ENODEV);
 745
 746                 if (!lmv->tgts[index].ltd_active)
 747                         RETURN(-ENODATA);
 748
 749                 mdc_obd = class_exp2obd(lmv->tgts[index].ltd_exp);
 750                 if (!mdc_obd)
 751                         RETURN(-EINVAL);
 752
 753                 rc = obd_statfs(mdc_obd, &stat_buf,
 754                                 cfs_time_current_64() - CFS_HZ, 0);
 755                 if (rc)
 756                         RETURN(rc);
 757                 if (cfs_copy_to_user(data->ioc_pbuf1, &stat_buf,
 758                                      data->ioc_plen1))
 759                         RETURN(-EFAULT);
 760                 if (cfs_copy_to_user(data->ioc_pbuf2, obd2cli_tgt(mdc_obd),
 761                                      data->ioc_plen2))
 762                         RETURN(-EFAULT);
 763                 break;
 764         }
 765         case OBD_IOC_QUOTACTL: {
 766                 struct if_quotactl *qctl = karg;
 767                 struct lmv_tgt_desc *tgt = NULL;
 768                 struct obd_quotactl *oqctl;
 769
 770                 if (qctl->qc_valid == QC_MDTIDX) {
 771                         if (qctl->qc_idx < 0 || count <= qctl->qc_idx)
 772                                 RETURN(-EINVAL);
 773
 774                         tgt = &lmv->tgts[qctl->qc_idx];
 775                         if (!tgt->ltd_exp)
 776                                 RETURN(-EINVAL);
 777                 } else if (qctl->qc_valid == QC_UUID) {
 778                         for (i = 0; i < count; i++) {
 779                                 tgt = &lmv->tgts[i];
 780                                 if (!obd_uuid_equals(&tgt->ltd_uuid,
 781                                                      &qctl->obd_uuid))
 782                                         continue;
 783
 784                                 if (tgt->ltd_exp == NULL)
 785                                         RETURN(-EINVAL);
 786
 787                                 break;
 788                         }
 789                 } else {
 790                         RETURN(-EINVAL);
 791                 }
 792
 793                 if (i >= count)
 794                         RETURN(-EAGAIN);
 795
 796                 LASSERT(tgt && tgt->ltd_exp);
 797                 OBD_ALLOC_PTR(oqctl);
 798                 if (!oqctl)
 799                         RETURN(-ENOMEM);
 800
 801                 QCTL_COPY(oqctl, qctl);
 802                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
 803                 if (rc == 0) {
 804                         QCTL_COPY(qctl, oqctl);
 805                         qctl->qc_valid = QC_MDTIDX;
 806                         qctl->obd_uuid = tgt->ltd_uuid;
 807                 }
 808                 OBD_FREE_PTR(oqctl);
 809                 break;
 810         }
 811         case OBD_IOC_CHANGELOG_CLEAR: {
 812                 struct ioc_changelog_clear *icc = karg;
 813
 814                 if (icc->icc_mdtindex >= count)
 815                         RETURN(-ENODEV);
 816
 817                 rc = obd_iocontrol(cmd, lmv->tgts[icc->icc_mdtindex].ltd_exp,
 818                                    sizeof(*icc), icc, NULL);
 819                 break;
 820         }
 821
 822         default : {
 823                 for (i = 0; i < count; i++) {
 824                         int err;
 825
 826                         if (lmv->tgts[i].ltd_exp == NULL)
 827                                 continue;
 828
 829                         err = obd_iocontrol(cmd, lmv->tgts[i].ltd_exp, len,
 830                                             karg, uarg);
 831                         if (err == -ENODATA && cmd == OBD_IOC_POLL_QUOTACHECK) {
 832                                 RETURN(err);
 833                         } else if (err) {
 834                                 if (lmv->tgts[i].ltd_active) {
 835                                         CERROR("error: iocontrol MDC %s on MDT"
 836                                                "idx %d cmd %x: err = %d\n",
 837                                                 lmv->tgts[i].ltd_uuid.uuid,
 838                                                 i, cmd, err);
 839                                         if (!rc)
 840                                                 rc = err;
 841                                 }
 842                         } else
 843                                 set = 1;
 844                 }
 845                 if (!set && !rc)
 846                         rc = -EIO;
 847         }
 848         }
 849         RETURN(rc);
 850 }
 851
 852 static int lmv_all_chars_policy(int count, const char *name,
 853                                 int len)
 854 {
 855         unsigned int c = 0;
 856
 857         while (len > 0)
 858                 c += name[--len];
 859         c = c % count;
 860         return c;
 861 }
 862
 863 static int lmv_nid_policy(struct lmv_obd *lmv)
 864 {
 865         struct obd_import *imp;
 866         __u32              id;
 867
 868         /*
 869          * XXX: To get nid we assume that underlying obd device is mdc.
 870          */
 871         imp = class_exp2cliimp(lmv->tgts[0].ltd_exp);
 872         id = imp->imp_connection->c_self ^ (imp->imp_connection->c_self >> 32);
 873         return id % lmv->desc.ld_tgt_count;
 874 }
 875
 876 static int lmv_choose_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
 877                           placement_policy_t placement)
 878 {
 879         switch (placement) {
 880         case PLACEMENT_CHAR_POLICY:
 881                 return lmv_all_chars_policy(lmv->desc.ld_tgt_count,
 882                                             op_data->op_name,
 883                                             op_data->op_namelen);
 884         case PLACEMENT_NID_POLICY:
 885                 return lmv_nid_policy(lmv);
 886
 887         default:
 888                 break;
 889         }
 890
 891         CERROR("Unsupported placement policy %x\n", placement);
 892         return -EINVAL;
 893 }
 894
 895 /**
 896  * This is _inode_ placement policy function (not name).
 897  */
 898 static int lmv_placement_policy(struct obd_device *obd,
 899                                 struct md_op_data *op_data,
 900                                 mdsno_t *mds)
 901 {
 902         struct lmv_obd          *lmv = &obd->u.lmv;
 903         struct lmv_object       *obj;
 904         int                      rc;
 905         ENTRY;
 906
 907         LASSERT(mds != NULL);
 908
 909         if (lmv->desc.ld_tgt_count == 1) {
 910                 *mds = 0;
 911                 RETURN(0);
 912         }
 913
 914         /*
 915          * Allocate new fid on target according to operation type and parent
 916          * home mds.
 917          */
 918         obj = lmv_object_find(obd, &op_data->op_fid1);
 919         if (obj != NULL || op_data->op_name == NULL ||
 920             op_data->op_opc != LUSTRE_OPC_MKDIR) {
 921                 /*
 922                  * Allocate fid for non-dir or for null name or for case parent
 923                  * dir is split.
 924                  */
 925                 if (obj) {
 926                         lmv_object_put(obj);
 927
 928                         /*
 929                          * If we have this flag turned on, and we see that
 930                          * parent dir is split, this means, that caller did not
 931                          * notice split yet. This is race and we would like to
 932                          * let caller know that.
 933                          */
 934                         if (op_data->op_bias & MDS_CHECK_SPLIT)
 935                                 RETURN(-ERESTART);
 936                 }
 937
 938                 /*
 939                  * Allocate new fid on same mds where parent fid is located and
 940                  * where operation will be sent. In case of split dir, ->op_fid1
 941                  * and ->op_mds here will contain fid and mds of slave directory
 942                  * object (assigned by caller).
 943                  */
 944                 *mds = op_data->op_mds;
 945                 rc = 0;
 946         } else {
 947                 /*
 948                  * Parent directory is not split and we want to create a
 949                  * directory in it. Let's calculate where to place it according
 950                  * to operation data @op_data.
 951                  */
 952                 *mds = lmv_choose_mds(lmv, op_data, lmv->lmv_placement);
 953                 rc = 0;
 954         }
 955
 956         if (rc) {
 957                 CERROR("Can't choose MDS, err = %d\n", rc);
 958         } else {
 959                 LASSERT(*mds < lmv->desc.ld_tgt_count);
 960         }
 961
 962         RETURN(rc);
 963 }
 964
 965 int __lmv_fid_alloc(struct lmv_obd *lmv, struct lu_fid *fid,
 966                     mdsno_t mds)
 967 {
 968         struct lmv_tgt_desc *tgt;
 969         int                  rc;
 970         ENTRY;
 971
 972         tgt = lmv_get_target(lmv, mds);
 973
 974         /*
 975          * New seq alloc and FLD setup should be atomic. Otherwise we may find
 976          * on server that seq in new allocated fid is not yet known.
 977          */
 978         cfs_down(&tgt->ltd_fid_sem);
 979
 980         if (!tgt->ltd_active)
 981                 GOTO(out, rc = -ENODEV);
 982
 983         /*
 984          * Asking underlaying tgt layer to allocate new fid.
 985          */
 986         rc = obd_fid_alloc(tgt->ltd_exp, fid, NULL);
 987         if (rc > 0) {
 988                 LASSERT(fid_is_sane(fid));
 989                 rc = 0;
 990         }
 991
 992         EXIT;
 993 out:
 994         cfs_up(&tgt->ltd_fid_sem);
 995         return rc;
 996 }
 997
 998 int lmv_fid_alloc(struct obd_export *exp, struct lu_fid *fid,
 999                   struct md_op_data *op_data)
1000 {
1001         struct obd_device     *obd = class_exp2obd(exp);
1002         struct lmv_obd        *lmv = &obd->u.lmv;
1003         mdsno_t                mds;
1004         int                    rc;
1005         ENTRY;
1006
1007         LASSERT(op_data != NULL);
1008         LASSERT(fid != NULL);
1009
1010         rc = lmv_placement_policy(obd, op_data, &mds);
1011         if (rc) {
1012                 CERROR("Can't get target for allocating fid, "
1013                        "rc %d\n", rc);
1014                 RETURN(rc);
1015         }
1016
1017         rc = __lmv_fid_alloc(lmv, fid, mds);
1018         if (rc) {
1019                 CERROR("Can't alloc new fid, rc %d\n", rc);
1020                 RETURN(rc);
1021         }
1022
1023         RETURN(rc);
1024 }
1025
1026 static int lmv_fid_delete(struct obd_export *exp, const struct lu_fid *fid)
1027 {
1028         ENTRY;
1029         LASSERT(exp != NULL && fid != NULL);
1030         if (lmv_object_delete(exp, fid)) {
1031                 CDEBUG(D_INODE, "Object "DFID" is destroyed.\n",
1032                        PFID(fid));
1033         }
1034         RETURN(0);
1035 }
1036
1037 static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
1038 {
1039         struct lmv_obd             *lmv = &obd->u.lmv;
1040         struct lprocfs_static_vars  lvars;
1041         struct lmv_desc            *desc;
1042         int                         rc;
1043         int                         i = 0;
1044         ENTRY;
1045
1046         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1047                 CERROR("LMV setup requires a descriptor\n");
1048                 RETURN(-EINVAL);
1049         }
1050
1051         desc = (struct lmv_desc *)lustre_cfg_buf(lcfg, 1);
1052         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1053                 CERROR("Lmv descriptor size wrong: %d > %d\n",
1054                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1055                 RETURN(-EINVAL);
1056         }
1057
1058         lmv->tgts_size = LMV_MAX_TGT_COUNT * sizeof(struct lmv_tgt_desc);
1059
1060         OBD_ALLOC(lmv->tgts, lmv->tgts_size);
1061         if (lmv->tgts == NULL)
1062                 RETURN(-ENOMEM);
1063
1064         for (i = 0; i < LMV_MAX_TGT_COUNT; i++) {
1065                 cfs_sema_init(&lmv->tgts[i].ltd_fid_sem, 1);
1066                 lmv->tgts[i].ltd_idx = i;
1067         }
1068
1069         lmv->datas_size = LMV_MAX_TGT_COUNT * sizeof(struct obd_connect_data);
1070
1071         OBD_ALLOC(lmv->datas, lmv->datas_size);
1072         if (lmv->datas == NULL)
1073                 GOTO(out_free_tgts, rc = -ENOMEM);
1074
1075         obd_str2uuid(&lmv->desc.ld_uuid, desc->ld_uuid.uuid);
1076         lmv->desc.ld_tgt_count = 0;
1077         lmv->desc.ld_active_tgt_count = 0;
1078         lmv->max_cookiesize = 0;
1079         lmv->max_def_easize = 0;
1080         lmv->max_easize = 0;
1081         lmv->lmv_placement = PLACEMENT_CHAR_POLICY;
1082
1083         cfs_spin_lock_init(&lmv->lmv_lock);
1084         cfs_sema_init(&lmv->init_sem, 1);
1085
1086         rc = lmv_object_setup(obd);
1087         if (rc) {
1088                 CERROR("Can't setup LMV object manager, error %d.\n", rc);
1089                 GOTO(out_free_datas, rc);
1090         }
1091
1092         lprocfs_lmv_init_vars(&lvars);
1093         lprocfs_obd_setup(obd, lvars.obd_vars);
1094 #ifdef LPROCFS
1095         {
1096                 rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd_status",
1097                                         0444, &lmv_proc_target_fops, obd);
1098                 if (rc)
1099                         CWARN("Error adding target_obd_stats file (%d)\n", rc);
1100        }
1101 #endif
1102         rc = fld_client_init(&lmv->lmv_fld, obd->obd_name,
1103                              LUSTRE_CLI_FLD_HASH_DHT);
1104         if (rc) {
1105                 CERROR("Can't init FLD, err %d\n", rc);
1106                 GOTO(out_free_datas, rc);
1107         }
1108
1109         RETURN(0);
1110
1111 out_free_datas:
1112         OBD_FREE(lmv->datas, lmv->datas_size);
1113         lmv->datas = NULL;
1114 out_free_tgts:
1115         OBD_FREE(lmv->tgts, lmv->tgts_size);
1116         lmv->tgts = NULL;
1117         return rc;
1118 }
1119
1120 static int lmv_cleanup(struct obd_device *obd)
1121 {
1122         struct lmv_obd   *lmv = &obd->u.lmv;
1123         ENTRY;
1124
1125         fld_client_fini(&lmv->lmv_fld);
1126         lprocfs_obd_cleanup(obd);
1127         lmv_object_cleanup(obd);
1128         OBD_FREE(lmv->datas, lmv->datas_size);
1129         OBD_FREE(lmv->tgts, lmv->tgts_size);
1130
1131         RETURN(0);
1132 }
1133
1134 static int lmv_process_config(struct obd_device *obd, obd_count len, void *buf)
1135 {
1136         struct lustre_cfg     *lcfg = buf;
1137         struct obd_uuid        tgt_uuid;
1138         int                    rc;
1139         ENTRY;
1140
1141         switch(lcfg->lcfg_command) {
1142         case LCFG_ADD_MDC:
1143                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(tgt_uuid.uuid))
1144                         GOTO(out, rc = -EINVAL);
1145
1146                 obd_str2uuid(&tgt_uuid, lustre_cfg_string(lcfg, 1));
1147                 rc = lmv_add_target(obd, &tgt_uuid);
1148                 GOTO(out, rc);
1149         default: {
1150                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1151                 GOTO(out, rc = -EINVAL);
1152         }
1153         }
1154 out:
1155         RETURN(rc);
1156 }
1157
1158 static int lmv_statfs(struct obd_device *obd, struct obd_statfs *osfs,
1159                       __u64 max_age, __u32 flags)
1160 {
1161         struct lmv_obd        *lmv = &obd->u.lmv;
1162         struct obd_statfs     *temp;
1163         int                    rc = 0;
1164         int                    i;
1165         ENTRY;
1166
1167         rc = lmv_check_connect(obd);
1168         if (rc)
1169                 RETURN(rc);
1170
1171         OBD_ALLOC(temp, sizeof(*temp));
1172         if (temp == NULL)
1173                 RETURN(-ENOMEM);
1174
1175         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1176                 if (lmv->tgts[i].ltd_exp == NULL)
1177                         continue;
1178
1179                 rc = obd_statfs(lmv->tgts[i].ltd_exp->exp_obd, temp,
1180                                 max_age, flags);
1181                 if (rc) {
1182                         CERROR("can't stat MDS #%d (%s), error %d\n", i,
1183                                lmv->tgts[i].ltd_exp->exp_obd->obd_name,
1184                                rc);
1185                         GOTO(out_free_temp, rc);
1186                 }
1187                 if (i == 0) {
1188                         *osfs = *temp;
1189                 } else {
1190                         osfs->os_bavail += temp->os_bavail;
1191                         osfs->os_blocks += temp->os_blocks;
1192                         osfs->os_ffree += temp->os_ffree;
1193                         osfs->os_files += temp->os_files;
1194                 }
1195         }
1196
1197         EXIT;
1198 out_free_temp:
1199         OBD_FREE(temp, sizeof(*temp));
1200         return rc;
1201 }
1202
1203 static int lmv_getstatus(struct obd_export *exp,
1204                          struct lu_fid *fid,
1205                          struct obd_capa **pc)
1206 {
1207         struct obd_device    *obd = exp->exp_obd;
1208         struct lmv_obd       *lmv = &obd->u.lmv;
1209         int                   rc;
1210         ENTRY;
1211
1212         rc = lmv_check_connect(obd);
1213         if (rc)
1214                 RETURN(rc);
1215
1216         rc = md_getstatus(lmv->tgts[0].ltd_exp, fid, pc);
1217         RETURN(rc);
1218 }
1219
1220 static int lmv_getxattr(struct obd_export *exp, const struct lu_fid *fid,
1221                         struct obd_capa *oc, obd_valid valid, const char *name,
1222                         const char *input, int input_size, int output_size,
1223                         int flags, struct ptlrpc_request **request)
1224 {
1225         struct obd_device      *obd = exp->exp_obd;
1226         struct lmv_obd         *lmv = &obd->u.lmv;
1227         struct lmv_tgt_desc    *tgt;
1228         int                     rc;
1229         ENTRY;
1230
1231         rc = lmv_check_connect(obd);
1232         if (rc)
1233                 RETURN(rc);
1234
1235         tgt = lmv_find_target(lmv, fid);
1236         if (IS_ERR(tgt))
1237                 RETURN(PTR_ERR(tgt));
1238
1239         rc = md_getxattr(tgt->ltd_exp, fid, oc, valid, name, input,
1240                          input_size, output_size, flags, request);
1241
1242         RETURN(rc);
1243 }
1244
1245 static int lmv_setxattr(struct obd_export *exp, const struct lu_fid *fid,
1246                         struct obd_capa *oc, obd_valid valid, const char *name,
1247                         const char *input, int input_size, int output_size,
1248                         int flags, __u32 suppgid,
1249                         struct ptlrpc_request **request)
1250 {
1251         struct obd_device      *obd = exp->exp_obd;
1252         struct lmv_obd         *lmv = &obd->u.lmv;
1253         struct lmv_tgt_desc    *tgt;
1254         int                     rc;
1255         ENTRY;
1256
1257         rc = lmv_check_connect(obd);
1258         if (rc)
1259                 RETURN(rc);
1260
1261         tgt = lmv_find_target(lmv, fid);
1262         if (IS_ERR(tgt))
1263                 RETURN(PTR_ERR(tgt));
1264
1265         rc = md_setxattr(tgt->ltd_exp, fid, oc, valid, name, input,
1266                          input_size, output_size, flags, suppgid,
1267                          request);
1268
1269         RETURN(rc);
1270 }
1271
1272 static int lmv_getattr(struct obd_export *exp, struct md_op_data *op_data,
1273                        struct ptlrpc_request **request)
1274 {
1275         struct obd_device       *obd = exp->exp_obd;
1276         struct lmv_obd          *lmv = &obd->u.lmv;
1277         struct lmv_tgt_desc     *tgt;
1278         struct lmv_object       *obj;
1279         int                      rc;
1280         int                      i;
1281         ENTRY;
1282
1283         rc = lmv_check_connect(obd);
1284         if (rc)
1285                 RETURN(rc);
1286
1287         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1288         if (IS_ERR(tgt))
1289                 RETURN(PTR_ERR(tgt));
1290
1291         if (op_data->op_valid & OBD_MD_MDTIDX) {
1292                 op_data->op_mds = tgt->ltd_idx;
1293                 RETURN(0);
1294         }
1295
1296         rc = md_getattr(tgt->ltd_exp, op_data, request);
1297         if (rc)
1298                 RETURN(rc);
1299
1300         obj = lmv_object_find_lock(obd, &op_data->op_fid1);
1301
1302         CDEBUG(D_INODE, "GETATTR for "DFID" %s\n", PFID(&op_data->op_fid1),
1303                obj ? "(split)" : "");
1304
1305         /*
1306          * If object is split, then we loop over all the slaves and gather size
1307          * attribute. In ideal world we would have to gather also mds field from
1308          * all slaves, as object is spread over the cluster and this is
1309          * definitely interesting information and it is not good to loss it,
1310          * but...
1311          */
1312         if (obj) {
1313                 struct mdt_body *body;
1314
1315                 if (*request == NULL) {
1316                         lmv_object_put(obj);
1317                         RETURN(rc);
1318                 }
1319
1320                 body = req_capsule_server_get(&(*request)->rq_pill,
1321                                               &RMF_MDT_BODY);
1322                 LASSERT(body != NULL);
1323
1324                 for (i = 0; i < obj->lo_objcount; i++) {
1325                         if (lmv->tgts[i].ltd_exp == NULL) {
1326                                 CWARN("%s: NULL export for %d\n",
1327                                       obd->obd_name, i);
1328                                 continue;
1329                         }
1330
1331                         /*
1332                          * Skip master object.
1333                          */
1334                         if (lu_fid_eq(&obj->lo_fid, &obj->lo_stripes[i].ls_fid))
1335                                 continue;
1336
1337                         body->size += obj->lo_stripes[i].ls_size;
1338                 }
1339
1340                 lmv_object_put_unlock(obj);
1341         }
1342
1343         RETURN(rc);
1344 }
1345
1346 static int lmv_change_cbdata(struct obd_export *exp, const struct lu_fid *fid,
1347                              ldlm_iterator_t it, void *data)
1348 {
1349         struct obd_device   *obd = exp->exp_obd;
1350         struct lmv_obd      *lmv = &obd->u.lmv;
1351         int                  i;
1352         int                  rc;
1353         ENTRY;
1354
1355         rc = lmv_check_connect(obd);
1356         if (rc)
1357                 RETURN(rc);
1358
1359         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1360
1361         /*
1362          * With CMD every object can have two locks in different namespaces:
1363          * lookup lock in space of mds storing direntry and update/open lock in
1364          * space of mds storing inode.
1365          */
1366         for (i = 0; i < lmv->desc.ld_tgt_count; i++)
1367                 md_change_cbdata(lmv->tgts[i].ltd_exp, fid, it, data);
1368
1369         RETURN(0);
1370 }
1371
1372 static int lmv_close(struct obd_export *exp, struct md_op_data *op_data,
1373                      struct md_open_data *mod, struct ptlrpc_request **request)
1374 {
1375         struct obd_device     *obd = exp->exp_obd;
1376         struct lmv_obd        *lmv = &obd->u.lmv;
1377         struct lmv_tgt_desc   *tgt;
1378         int                    rc;
1379         ENTRY;
1380
1381         rc = lmv_check_connect(obd);
1382         if (rc)
1383                 RETURN(rc);
1384
1385         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1386         if (IS_ERR(tgt))
1387                 RETURN(PTR_ERR(tgt));
1388
1389         CDEBUG(D_INODE, "CLOSE "DFID"\n", PFID(&op_data->op_fid1));
1390         rc = md_close(tgt->ltd_exp, op_data, mod, request);
1391         RETURN(rc);
1392 }
1393
1394 /**
1395  * Called in the case MDS returns -ERESTART on create on open, what means that
1396  * directory is split and its LMV presentation object has to be updated.
1397  */
1398 int lmv_handle_split(struct obd_export *exp, const struct lu_fid *fid)
1399 {
1400         struct obd_device       *obd = exp->exp_obd;
1401         struct lmv_obd          *lmv = &obd->u.lmv;
1402         struct ptlrpc_request   *req = NULL;
1403         struct lmv_tgt_desc     *tgt;
1404         struct lmv_object       *obj;
1405         struct lustre_md         md;
1406         struct md_op_data       *op_data;
1407         int                      mealen;
1408         int                      rc;
1409         __u64                    valid;
1410         ENTRY;
1411
1412         md.mea = NULL;
1413         mealen = lmv_get_easize(lmv);
1414
1415         valid = OBD_MD_FLEASIZE | OBD_MD_FLDIREA | OBD_MD_MEA;
1416
1417         tgt = lmv_find_target(lmv, fid);
1418         if (IS_ERR(tgt))
1419                 RETURN(PTR_ERR(tgt));
1420
1421         /*
1422          * Time to update mea of parent fid.
1423          */
1424
1425         OBD_ALLOC_PTR(op_data);
1426         if (op_data == NULL)
1427                 RETURN(-ENOMEM);
1428
1429         op_data->op_fid1 = *fid;
1430         op_data->op_mode = mealen;
1431         op_data->op_valid = valid;
1432
1433         rc = md_getattr(tgt->ltd_exp, op_data, &req);
1434         OBD_FREE_PTR(op_data);
1435         if (rc) {
1436                 CERROR("md_getattr() failed, error %d\n", rc);
1437                 GOTO(cleanup, rc);
1438         }
1439
1440         rc = md_get_lustre_md(tgt->ltd_exp, req, NULL, exp, &md);
1441         if (rc) {
1442                 CERROR("md_get_lustre_md() failed, error %d\n", rc);
1443                 GOTO(cleanup, rc);
1444         }
1445
1446         if (md.mea == NULL)
1447                 GOTO(cleanup, rc = -ENODATA);
1448
1449         obj = lmv_object_create(exp, fid, md.mea);
1450         if (IS_ERR(obj))
1451                 rc = PTR_ERR(obj);
1452         else
1453                 lmv_object_put(obj);
1454
1455         obd_free_memmd(exp, (void *)&md.mea);
1456         EXIT;
1457 cleanup:
1458         if (req)
1459                 ptlrpc_req_finished(req);
1460         return rc;
1461 }
1462
1463 int lmv_create(struct obd_export *exp, struct md_op_data *op_data,
1464                const void *data, int datalen, int mode, __u32 uid,
1465                __u32 gid, cfs_cap_t cap_effective, __u64 rdev,
1466                struct ptlrpc_request **request)
1467 {
1468         struct obd_device       *obd = exp->exp_obd;
1469         struct lmv_obd          *lmv = &obd->u.lmv;
1470         struct lmv_tgt_desc     *tgt;
1471         struct lmv_object       *obj;
1472         int                      rc;
1473         int                      loop = 0;
1474         int                      sidx;
1475         ENTRY;
1476
1477         rc = lmv_check_connect(obd);
1478         if (rc)
1479                 RETURN(rc);
1480
1481         if (!lmv->desc.ld_active_tgt_count)
1482                 RETURN(-EIO);
1483 repeat:
1484         ++loop;
1485         LASSERT(loop <= 2);
1486
1487         obj = lmv_object_find(obd, &op_data->op_fid1);
1488         if (obj) {
1489                 sidx = raw_name2idx(obj->lo_hashtype, obj->lo_objcount,
1490                                        op_data->op_name, op_data->op_namelen);
1491                 op_data->op_fid1 = obj->lo_stripes[sidx].ls_fid;
1492                 op_data->op_bias &= ~MDS_CHECK_SPLIT;
1493                 op_data->op_mds = obj->lo_stripes[sidx].ls_mds;
1494                 tgt = lmv_get_target(lmv, op_data->op_mds);
1495                 lmv_object_put(obj);
1496         } else {
1497                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
1498                 op_data->op_bias |= MDS_CHECK_SPLIT;
1499                 op_data->op_mds = tgt->ltd_idx;
1500         }
1501
1502         if (IS_ERR(tgt))
1503                 RETURN(PTR_ERR(tgt));
1504
1505         rc = lmv_fid_alloc(exp, &op_data->op_fid2, op_data);
1506         if (rc == -ERESTART)
1507                 goto repeat;
1508         else if (rc)
1509                 RETURN(rc);
1510
1511         CDEBUG(D_INODE, "CREATE '%*s' on "DFID" -> mds #%x\n",
1512                op_data->op_namelen, op_data->op_name, PFID(&op_data->op_fid1),
1513                op_data->op_mds);
1514
1515         op_data->op_flags |= MF_MDC_CANCEL_FID1;
1516         rc = md_create(tgt->ltd_exp, op_data, data, datalen, mode, uid, gid,
1517                        cap_effective, rdev, request);
1518         if (rc == 0) {
1519                 if (*request == NULL)
1520                         RETURN(rc);
1521                 CDEBUG(D_INODE, "Created - "DFID"\n", PFID(&op_data->op_fid2));
1522         } else if (rc == -ERESTART) {
1523                 LASSERT(*request != NULL);
1524                 DEBUG_REQ(D_WARNING|D_RPCTRACE, *request,
1525                           "Got -ERESTART during create!\n");
1526                 ptlrpc_req_finished(*request);
1527                 *request = NULL;
1528
1529                 /*
1530                  * Directory got split. Time to update local object and repeat
1531                  * the request with proper MDS.
1532                  */
1533                 rc = lmv_handle_split(exp, &op_data->op_fid1);
1534                 if (rc == 0) {
1535                         rc = lmv_allocate_slaves(obd, &op_data->op_fid1,
1536                                                  op_data, &op_data->op_fid2);
1537                         if (rc)
1538                                 RETURN(rc);
1539                         goto repeat;
1540                 }
1541         }
1542         RETURN(rc);
1543 }
1544
1545 static int lmv_done_writing(struct obd_export *exp,
1546                             struct md_op_data *op_data,
1547                             struct md_open_data *mod)
1548 {
1549         struct obd_device     *obd = exp->exp_obd;
1550         struct lmv_obd        *lmv = &obd->u.lmv;
1551         struct lmv_tgt_desc   *tgt;
1552         int                    rc;
1553         ENTRY;
1554
1555         rc = lmv_check_connect(obd);
1556         if (rc)
1557                 RETURN(rc);
1558
1559         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1560         if (IS_ERR(tgt))
1561                 RETURN(PTR_ERR(tgt));
1562
1563         rc = md_done_writing(tgt->ltd_exp, op_data, mod);
1564         RETURN(rc);
1565 }
1566
1567 static int
1568 lmv_enqueue_slaves(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1569                    struct lookup_intent *it, struct md_op_data *op_data,
1570                    struct lustre_handle *lockh, void *lmm, int lmmsize)
1571 {
1572         struct obd_device     *obd = exp->exp_obd;
1573         struct lmv_obd        *lmv = &obd->u.lmv;
1574         struct lmv_stripe_md  *mea = op_data->op_mea1;
1575         struct md_op_data     *op_data2;
1576         struct lmv_tgt_desc   *tgt;
1577         int                    i;
1578         int                    rc = 0;
1579         ENTRY;
1580
1581         OBD_ALLOC_PTR(op_data2);
1582         if (op_data2 == NULL)
1583                 RETURN(-ENOMEM);
1584
1585         LASSERT(mea != NULL);
1586         for (i = 0; i < mea->mea_count; i++) {
1587                 memset(op_data2, 0, sizeof(*op_data2));
1588                 op_data2->op_fid1 = mea->mea_ids[i];
1589                 op_data2->op_bias = 0;
1590
1591                 tgt = lmv_find_target(lmv, &op_data2->op_fid1);
1592                 if (IS_ERR(tgt))
1593                         GOTO(cleanup, rc = PTR_ERR(tgt));
1594
1595                 if (tgt->ltd_exp == NULL)
1596                         continue;
1597
1598                 rc = md_enqueue(tgt->ltd_exp, einfo, it, op_data2,
1599                                 lockh + i, lmm, lmmsize, NULL, 0);
1600
1601                 CDEBUG(D_INODE, "Take lock on slave "DFID" -> %d/%d\n",
1602                        PFID(&mea->mea_ids[i]), rc, it->d.lustre.it_status);
1603
1604                 if (rc)
1605                         GOTO(cleanup, rc);
1606
1607                 if (it->d.lustre.it_data) {
1608                         struct ptlrpc_request *req;
1609                         req = (struct ptlrpc_request *)it->d.lustre.it_data;
1610                         ptlrpc_req_finished(req);
1611                 }
1612
1613                 if (it->d.lustre.it_status)
1614                         GOTO(cleanup, rc = it->d.lustre.it_status);
1615         }
1616
1617         EXIT;
1618 cleanup:
1619         OBD_FREE_PTR(op_data2);
1620
1621         if (rc != 0) {
1622                 /*
1623                  * Drop all taken locks.
1624                  */
1625                 while (--i >= 0) {
1626                         if (lockh[i].cookie)
1627                                 ldlm_lock_decref(lockh + i, einfo->ei_mode);
1628                         lockh[i].cookie = 0;
1629                 }
1630         }
1631         return rc;
1632 }
1633
1634 static int
1635 lmv_enqueue_remote(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1636                    struct lookup_intent *it, struct md_op_data *op_data,
1637                    struct lustre_handle *lockh, void *lmm, int lmmsize,
1638                    int extra_lock_flags)
1639 {
1640         struct ptlrpc_request      *req = it->d.lustre.it_data;
1641         struct obd_device          *obd = exp->exp_obd;
1642         struct lmv_obd             *lmv = &obd->u.lmv;
1643         struct lustre_handle        plock;
1644         struct lmv_tgt_desc        *tgt;
1645         struct md_op_data          *rdata;
1646         struct lu_fid               fid1;
1647         struct mdt_body            *body;
1648         int                         rc = 0;
1649         int                         pmode;
1650         ENTRY;
1651
1652         body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
1653         LASSERT(body != NULL);
1654
1655         if (!(body->valid & OBD_MD_MDS))
1656                 RETURN(0);
1657
1658         CDEBUG(D_INODE, "REMOTE_ENQUEUE '%s' on "DFID" -> "DFID"\n",
1659                LL_IT2STR(it), PFID(&op_data->op_fid1), PFID(&body->fid1));
1660
1661         /*
1662          * We got LOOKUP lock, but we really need attrs.
1663          */
1664         pmode = it->d.lustre.it_lock_mode;
1665         LASSERT(pmode != 0);
1666         memcpy(&plock, lockh, sizeof(plock));
1667         it->d.lustre.it_lock_mode = 0;
1668         it->d.lustre.it_data = NULL;
1669         fid1 = body->fid1;
1670
1671         it->d.lustre.it_disposition &= ~DISP_ENQ_COMPLETE;
1672         ptlrpc_req_finished(req);
1673
1674         tgt = lmv_find_target(lmv, &fid1);
1675         if (IS_ERR(tgt))
1676                 GOTO(out, rc = PTR_ERR(tgt));
1677
1678         OBD_ALLOC_PTR(rdata);
1679         if (rdata == NULL)
1680                 GOTO(out, rc = -ENOMEM);
1681
1682         rdata->op_fid1 = fid1;
1683         rdata->op_bias = MDS_CROSS_REF;
1684
1685         rc = md_enqueue(tgt->ltd_exp, einfo, it, rdata, lockh,
1686                         lmm, lmmsize, NULL, extra_lock_flags);
1687         OBD_FREE_PTR(rdata);
1688         EXIT;
1689 out:
1690         ldlm_lock_decref(&plock, pmode);
1691         return rc;
1692 }
1693
1694 static int
1695 lmv_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1696             struct lookup_intent *it, struct md_op_data *op_data,
1697             struct lustre_handle *lockh, void *lmm, int lmmsize,
1698             struct ptlrpc_request **req, int extra_lock_flags)
1699 {
1700         struct obd_device        *obd = exp->exp_obd;
1701         struct lmv_obd           *lmv = &obd->u.lmv;
1702         struct lmv_tgt_desc      *tgt;
1703         struct lmv_object        *obj;
1704         int                       sidx;
1705         int                       rc;
1706         ENTRY;
1707
1708         rc = lmv_check_connect(obd);
1709         if (rc)
1710                 RETURN(rc);
1711
1712         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID"\n",
1713                LL_IT2STR(it), PFID(&op_data->op_fid1));
1714
1715         if (op_data->op_mea1 && it && it->it_op == IT_UNLINK) {
1716                 rc = lmv_enqueue_slaves(exp, einfo, it, op_data,
1717                                         lockh, lmm, lmmsize);
1718                 RETURN(rc);
1719         }
1720
1721         obj = lmv_object_find(obd, &op_data->op_fid1);
1722         if (obj && op_data->op_namelen) {
1723                 sidx = raw_name2idx(obj->lo_hashtype,
1724                                        obj->lo_objcount,
1725                                        (char *)op_data->op_name,
1726                                        op_data->op_namelen);
1727                 op_data->op_fid1 = obj->lo_stripes[sidx].ls_fid;
1728                 tgt = lmv_get_target(lmv, obj->lo_stripes[sidx].ls_mds);
1729         } else {
1730                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
1731         }
1732         if (obj)
1733                 lmv_object_put(obj);
1734
1735         if (IS_ERR(tgt))
1736                 RETURN(PTR_ERR(tgt));
1737
1738         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID" -> mds #%d\n",
1739                LL_IT2STR(it), PFID(&op_data->op_fid1), tgt->ltd_idx);
1740
1741         rc = md_enqueue(tgt->ltd_exp, einfo, it, op_data, lockh,
1742                         lmm, lmmsize, req, extra_lock_flags);
1743
1744         if (rc == 0 && it && it->it_op == IT_OPEN) {
1745                 rc = lmv_enqueue_remote(exp, einfo, it, op_data, lockh,
1746                                         lmm, lmmsize, extra_lock_flags);
1747         }
1748         RETURN(rc);
1749 }
1750
1751 static int
1752 lmv_getattr_name(struct obd_export *exp,struct md_op_data *op_data,
1753                  struct ptlrpc_request **request)
1754 {
1755         struct ptlrpc_request   *req = NULL;
1756         struct obd_device       *obd = exp->exp_obd;
1757         struct lmv_obd          *lmv = &obd->u.lmv;
1758         struct lu_fid            rid = op_data->op_fid1;
1759         struct lmv_tgt_desc     *tgt;
1760         struct mdt_body         *body;
1761         struct lmv_object       *obj;
1762         obd_valid                valid = op_data->op_valid;
1763         int                      rc;
1764         int                      loop = 0;
1765         int                      sidx;
1766         ENTRY;
1767
1768         rc = lmv_check_connect(obd);
1769         if (rc)
1770                 RETURN(rc);
1771
1772 repeat:
1773         ++loop;
1774         LASSERT(loop <= 2);
1775         obj = lmv_object_find(obd, &rid);
1776         if (obj) {
1777                 sidx = raw_name2idx(obj->lo_hashtype, obj->lo_objcount,
1778                                     op_data->op_name, op_data->op_namelen);
1779                 rid = obj->lo_stripes[sidx].ls_fid;
1780                 tgt = lmv_get_target(lmv, obj->lo_stripes[sidx].ls_mds);
1781                 op_data->op_mds = obj->lo_stripes[sidx].ls_mds;
1782                 valid &= ~OBD_MD_FLCKSPLIT;
1783                 lmv_object_put(obj);
1784         } else {
1785                 tgt = lmv_find_target(lmv, &rid);
1786                 valid |= OBD_MD_FLCKSPLIT;
1787                 op_data->op_mds = tgt->ltd_idx;
1788         }
1789         if (IS_ERR(tgt))
1790                 RETURN(PTR_ERR(tgt));
1791
1792         CDEBUG(D_INODE, "GETATTR_NAME for %*s on "DFID" - "DFID" -> mds #%d\n",
1793                op_data->op_namelen, op_data->op_name, PFID(&op_data->op_fid1),
1794                PFID(&rid), tgt->ltd_idx);
1795
1796         op_data->op_valid = valid;
1797         op_data->op_fid1 = rid;
1798         rc = md_getattr_name(tgt->ltd_exp, op_data, request);
1799         if (rc == 0) {
1800                 body = req_capsule_server_get(&(*request)->rq_pill,
1801                                               &RMF_MDT_BODY);
1802                 LASSERT(body != NULL);
1803
1804                 if (body->valid & OBD_MD_MDS) {
1805                         rid = body->fid1;
1806                         CDEBUG(D_INODE, "Request attrs for "DFID"\n",
1807                                PFID(&rid));
1808
1809                         tgt = lmv_find_target(lmv, &rid);
1810                         if (IS_ERR(tgt)) {
1811                                 ptlrpc_req_finished(*request);
1812                                 RETURN(PTR_ERR(tgt));
1813                         }
1814
1815                         op_data->op_fid1 = rid;
1816                         op_data->op_valid |= OBD_MD_FLCROSSREF;
1817                         op_data->op_namelen = 0;
1818                         op_data->op_name = NULL;
1819                         rc = md_getattr_name(tgt->ltd_exp, op_data, &req);
1820                         ptlrpc_req_finished(*request);
1821                         *request = req;
1822                 }
1823         } else if (rc == -ERESTART) {
1824                 LASSERT(*request != NULL);
1825                 DEBUG_REQ(D_WARNING|D_RPCTRACE, *request,
1826                           "Got -ERESTART during getattr!\n");
1827                 ptlrpc_req_finished(*request);
1828                 *request = NULL;
1829
1830                 /*
1831                  * Directory got split. Time to update local object and repeat
1832                  * the request with proper MDS.
1833                  */
1834                 rc = lmv_handle_split(exp, &rid);
1835                 if (rc == 0)
1836                         goto repeat;
1837         }
1838         RETURN(rc);
1839 }
1840
1841 #define md_op_data_fid(op_data, fl)                     \
1842         (fl == MF_MDC_CANCEL_FID1 ? &op_data->op_fid1 : \
1843          fl == MF_MDC_CANCEL_FID2 ? &op_data->op_fid2 : \
1844          fl == MF_MDC_CANCEL_FID3 ? &op_data->op_fid3 : \
1845          fl == MF_MDC_CANCEL_FID4 ? &op_data->op_fid4 : \
1846          NULL)
1847
1848 static int lmv_early_cancel_slaves(struct obd_export *exp,
1849                                    struct md_op_data *op_data, int op_tgt,
1850                                    ldlm_mode_t mode, int bits, int flag)
1851 {
1852         struct obd_device      *obd = exp->exp_obd;
1853         struct lmv_obd         *lmv = &obd->u.lmv;
1854         ldlm_policy_data_t      policy = {{0}};
1855         struct lu_fid          *op_fid;
1856         struct lu_fid          *st_fid;
1857         struct lmv_tgt_desc    *tgt;
1858         struct lmv_object      *obj;
1859         int                     rc = 0;
1860         int                     i;
1861         ENTRY;
1862
1863         op_fid = md_op_data_fid(op_data, flag);
1864         if (!fid_is_sane(op_fid))
1865                 RETURN(0);
1866
1867         obj = lmv_object_find(obd, op_fid);
1868         if (obj == NULL)
1869                 RETURN(-EALREADY);
1870
1871         policy.l_inodebits.bits = bits;
1872         for (i = 0; i < obj->lo_objcount; i++) {
1873                 tgt = lmv_get_target(lmv, obj->lo_stripes[i].ls_mds);
1874                 st_fid = &obj->lo_stripes[i].ls_fid;
1875                 if (op_tgt != tgt->ltd_idx) {
1876                         CDEBUG(D_INODE, "EARLY_CANCEL slave "DFID" -> mds #%d\n",
1877                                PFID(st_fid), tgt->ltd_idx);
1878                         rc = md_cancel_unused(tgt->ltd_exp, st_fid, &policy,
1879                                               mode, LDLM_FL_ASYNC, NULL);
1880                         if (rc)
1881                                 GOTO(out_put_obj, rc);
1882                 } else {
1883                         CDEBUG(D_INODE,
1884                                "EARLY_CANCEL skip operation target %d on "DFID"\n",
1885                                op_tgt, PFID(st_fid));
1886                         /*
1887                          * Do not cancel locks for operation target, they will
1888                          * be handled later in underlaying layer when calling
1889                          * function we run on behalf of.
1890                          */
1891                         *op_fid = *st_fid;
1892                         op_data->op_flags |= flag;
1893                 }
1894         }
1895         EXIT;
1896 out_put_obj:
1897         lmv_object_put(obj);
1898         return rc;
1899 }
1900
1901 static int lmv_early_cancel(struct obd_export *exp, struct md_op_data *op_data,
1902                             int op_tgt, ldlm_mode_t mode, int bits, int flag)
1903 {
1904         struct lu_fid          *fid = md_op_data_fid(op_data, flag);
1905         struct obd_device      *obd = exp->exp_obd;
1906         struct lmv_obd         *lmv = &obd->u.lmv;
1907         struct lmv_tgt_desc    *tgt;
1908         ldlm_policy_data_t      policy = {{0}};
1909         struct lmv_object      *obj;
1910         int                     rc = 0;
1911         ENTRY;
1912
1913         if (!fid_is_sane(fid))
1914                 RETURN(0);
1915
1916         obj = lmv_object_find(obd, fid);
1917         if (obj) {
1918                 rc = lmv_early_cancel_slaves(exp, op_data, op_tgt, mode,
1919                                              bits, flag);
1920                 lmv_object_put(obj);
1921         } else {
1922                 tgt = lmv_find_target(lmv, fid);
1923                 if (IS_ERR(tgt))
1924                         RETURN(PTR_ERR(tgt));
1925
1926                 if (tgt->ltd_idx != op_tgt) {
1927                         CDEBUG(D_INODE, "EARLY_CANCEL on "DFID"\n", PFID(fid));
1928                         policy.l_inodebits.bits = bits;
1929                         rc = md_cancel_unused(tgt->ltd_exp, fid, &policy,
1930                                               mode, LDLM_FL_ASYNC, NULL);
1931                 } else {
1932                         CDEBUG(D_INODE,
1933                                "EARLY_CANCEL skip operation target %d on "DFID"\n",
1934                                op_tgt, PFID(fid));
1935                         op_data->op_flags |= flag;
1936                         rc = 0;
1937                 }
1938
1939         }
1940         RETURN(rc);
1941 }
1942
1943 /*
1944  * llite passes fid of an target inode in op_data->op_fid1 and id of directory in
1945  * op_data->op_fid2
1946  */
1947 static int lmv_link(struct obd_export *exp, struct md_op_data *op_data,
1948                     struct ptlrpc_request **request)
1949 {
1950         struct obd_device       *obd = exp->exp_obd;
1951         struct lmv_obd          *lmv = &obd->u.lmv;
1952         struct lmv_tgt_desc     *tgt;
1953         struct lmv_object       *obj;
1954         int                      rc;
1955         int                      loop = 0;
1956         mdsno_t                  mds;
1957         int                      sidx;
1958         ENTRY;
1959
1960         rc = lmv_check_connect(obd);
1961         if (rc)
1962                 RETURN(rc);
1963
1964 repeat:
1965         ++loop;
1966         LASSERT(loop <= 2);
1967         LASSERT(op_data->op_namelen != 0);
1968
1969         CDEBUG(D_INODE, "LINK "DFID":%*s to "DFID"\n",
1970                PFID(&op_data->op_fid2), op_data->op_namelen,
1971                op_data->op_name, PFID(&op_data->op_fid1));
1972
1973         obj = lmv_object_find(obd, &op_data->op_fid2);
1974         if (obj) {
1975                 sidx = raw_name2idx(obj->lo_hashtype,
1976                                     obj->lo_objcount,
1977                                     op_data->op_name,
1978                                     op_data->op_namelen);
1979                 op_data->op_fid2 = obj->lo_stripes[sidx].ls_fid;
1980                 mds = obj->lo_stripes[sidx].ls_mds;
1981                 lmv_object_put(obj);
1982         } else {
1983                 rc = lmv_fld_lookup(lmv, &op_data->op_fid2, &mds);
1984                 if (rc)
1985                         RETURN(rc);
1986         }
1987
1988         CDEBUG(D_INODE, "Forward to mds #%x ("DFID")\n",
1989                mds, PFID(&op_data->op_fid1));
1990
1991         op_data->op_fsuid = cfs_curproc_fsuid();
1992         op_data->op_fsgid = cfs_curproc_fsgid();
1993         op_data->op_cap = cfs_curproc_cap_pack();
1994         tgt = lmv_get_target(lmv, mds);
1995
1996         /*
1997          * Cancel UPDATE lock on child (fid1).
1998          */
1999         op_data->op_flags |= MF_MDC_CANCEL_FID2;
2000         rc = lmv_early_cancel(exp, op_data, tgt->ltd_idx, LCK_EX,
2001                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2002         if (rc == 0)
2003                 rc = md_link(tgt->ltd_exp, op_data, request);
2004         if (rc == -ERESTART) {
2005                 LASSERT(*request != NULL);
2006                 DEBUG_REQ(D_WARNING|D_RPCTRACE, *request,
2007                           "Got -ERESTART during link!\n");
2008                 ptlrpc_req_finished(*request);
2009                 *request = NULL;
2010
2011                 /*
2012                  * Directory got split. Time to update local object and repeat
2013                  * the request with proper MDS.
2014                  */
2015                 rc = lmv_handle_split(exp, &op_data->op_fid2);
2016                 if (rc == 0)
2017                         goto repeat;
2018         }
2019
2020         RETURN(rc);
2021 }
2022
2023 static int lmv_rename(struct obd_export *exp, struct md_op_data *op_data,
2024                       const char *old, int oldlen, const char *new, int newlen,
2025                       struct ptlrpc_request **request)
2026 {
2027         struct obd_device       *obd = exp->exp_obd;
2028         struct lmv_obd          *lmv = &obd->u.lmv;
2029         struct lmv_tgt_desc     *src_tgt;
2030         struct lmv_tgt_desc     *tgt_tgt;
2031         int                      rc;
2032         int                      sidx;
2033         int                      loop = 0;
2034         struct lmv_object       *obj;
2035         mdsno_t                  mds1;
2036         mdsno_t                  mds2;
2037         ENTRY;
2038
2039         LASSERT(oldlen != 0);
2040
2041         CDEBUG(D_INODE, "RENAME %*s in "DFID" to %*s in "DFID"\n",
2042                oldlen, old, PFID(&op_data->op_fid1),
2043                newlen, new, PFID(&op_data->op_fid2));
2044
2045         rc = lmv_check_connect(obd);
2046         if (rc)
2047                 RETURN(rc);
2048
2049 repeat:
2050         ++loop;
2051         LASSERT(loop <= 2);
2052         obj = lmv_object_find(obd, &op_data->op_fid1);
2053         if (obj) {
2054                 sidx = raw_name2idx(obj->lo_hashtype, obj->lo_objcount,
2055                                     (char *)old, oldlen);
2056                 op_data->op_fid1 = obj->lo_stripes[sidx].ls_fid;
2057                 mds1 = obj->lo_stripes[sidx].ls_mds;
2058                 CDEBUG(D_INODE, "Parent obj "DFID"\n", PFID(&op_data->op_fid1));
2059                 lmv_object_put(obj);
2060         } else {
2061                 rc = lmv_fld_lookup(lmv, &op_data->op_fid1, &mds1);
2062                 if (rc)
2063                         RETURN(rc);
2064         }
2065
2066         obj = lmv_object_find(obd, &op_data->op_fid2);
2067         if (obj) {
2068                 /*
2069                  * Directory is already split, so we have to forward request to
2070                  * the right MDS.
2071                  */
2072                 sidx = raw_name2idx(obj->lo_hashtype, obj->lo_objcount,
2073                                        (char *)new, newlen);
2074
2075                 mds2 = obj->lo_stripes[sidx].ls_mds;
2076                 op_data->op_fid2 = obj->lo_stripes[sidx].ls_fid;
2077                 CDEBUG(D_INODE, "Parent obj "DFID"\n", PFID(&op_data->op_fid2));
2078                 lmv_object_put(obj);
2079         } else {
2080                 rc = lmv_fld_lookup(lmv, &op_data->op_fid2, &mds2);
2081                 if (rc)
2082                         RETURN(rc);
2083         }
2084
2085         op_data->op_fsuid = cfs_curproc_fsuid();
2086         op_data->op_fsgid = cfs_curproc_fsgid();
2087         op_data->op_cap = cfs_curproc_cap_pack();
2088
2089         src_tgt = lmv_get_target(lmv, mds1);
2090         tgt_tgt = lmv_get_target(lmv, mds2);
2091
2092         /*
2093          * LOOKUP lock on src child (fid3) should also be cancelled for
2094          * src_tgt in mdc_rename.
2095          */
2096         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2097
2098         /*
2099          * Cancel UPDATE locks on tgt parent (fid2), tgt_tgt is its
2100          * own target.
2101          */
2102         rc = lmv_early_cancel(exp, op_data, src_tgt->ltd_idx,
2103                               LCK_EX, MDS_INODELOCK_UPDATE,
2104                               MF_MDC_CANCEL_FID2);
2105
2106         /*
2107          * Cancel LOOKUP locks on tgt child (fid4) for parent tgt_tgt.
2108          */
2109         if (rc == 0) {
2110                 rc = lmv_early_cancel(exp, op_data, src_tgt->ltd_idx,
2111                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2112                                       MF_MDC_CANCEL_FID4);
2113         }
2114
2115         /*
2116          * Cancel all the locks on tgt child (fid4).
2117          */
2118         if (rc == 0)
2119                 rc = lmv_early_cancel(exp, op_data, src_tgt->ltd_idx,
2120                                       LCK_EX, MDS_INODELOCK_FULL,
2121                                       MF_MDC_CANCEL_FID4);
2122
2123         if (rc == 0)
2124                 rc = md_rename(src_tgt->ltd_exp, op_data, old, oldlen,
2125                                new, newlen, request);
2126
2127         if (rc == -ERESTART) {
2128                 LASSERT(*request != NULL);
2129                 DEBUG_REQ(D_WARNING|D_RPCTRACE, *request,
2130                           "Got -ERESTART during rename!\n");
2131                 ptlrpc_req_finished(*request);
2132                 *request = NULL;
2133
2134                 /*
2135                  * Directory got split. Time to update local object and repeat
2136                  * the request with proper MDS.
2137                  */
2138                 rc = lmv_handle_split(exp, &op_data->op_fid1);
2139                 if (rc == 0)
2140                         goto repeat;
2141         }
2142         RETURN(rc);
2143 }
2144
2145 static int lmv_setattr(struct obd_export *exp, struct md_op_data *op_data,
2146                        void *ea, int ealen, void *ea2, int ea2len,
2147                        struct ptlrpc_request **request,
2148                        struct md_open_data **mod)
2149 {
2150         struct obd_device       *obd = exp->exp_obd;
2151         struct lmv_obd          *lmv = &obd->u.lmv;
2152         struct ptlrpc_request   *req;
2153         struct lmv_tgt_desc     *tgt;
2154         struct lmv_object       *obj;
2155         int                      rc = 0;
2156         int                      i;
2157         ENTRY;
2158
2159         rc = lmv_check_connect(obd);
2160         if (rc)
2161                 RETURN(rc);
2162
2163         obj = lmv_object_find(obd, &op_data->op_fid1);
2164
2165         CDEBUG(D_INODE, "SETATTR for "DFID", valid 0x%x%s\n",
2166                PFID(&op_data->op_fid1), op_data->op_attr.ia_valid,
2167                obj ? ", split" : "");
2168
2169         op_data->op_flags |= MF_MDC_CANCEL_FID1;
2170         if (obj) {
2171                 for (i = 0; i < obj->lo_objcount; i++) {
2172                         op_data->op_fid1 = obj->lo_stripes[i].ls_fid;
2173
2174                         tgt = lmv_get_target(lmv, obj->lo_stripes[i].ls_mds);
2175                         if (IS_ERR(tgt)) {
2176                                 rc = PTR_ERR(tgt);
2177                                 break;
2178                         }
2179
2180                         rc = md_setattr(tgt->ltd_exp, op_data, ea, ealen,
2181                                         ea2, ea2len, &req, mod);
2182
2183                         if (lu_fid_eq(&obj->lo_fid, &obj->lo_stripes[i].ls_fid)) {
2184                                 /*
2185                                  * This is master object and this request should
2186                                  * be returned back to llite.
2187                                  */
2188                                 *request = req;
2189                         } else {
2190                                 ptlrpc_req_finished(req);
2191                         }
2192
2193                         if (rc)
2194                                 break;
2195                 }
2196                 lmv_object_put(obj);
2197         } else {
2198                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
2199                 if (IS_ERR(tgt))
2200                         RETURN(PTR_ERR(tgt));
2201
2202                 rc = md_setattr(tgt->ltd_exp, op_data, ea, ealen, ea2,
2203                                 ea2len, request, mod);
2204         }
2205         RETURN(rc);
2206 }
2207
2208 static int lmv_sync(struct obd_export *exp, const struct lu_fid *fid,
2209                     struct obd_capa *oc, struct ptlrpc_request **request)
2210 {
2211         struct obd_device         *obd = exp->exp_obd;
2212         struct lmv_obd            *lmv = &obd->u.lmv;
2213         struct lmv_tgt_desc       *tgt;
2214         int                        rc;
2215         ENTRY;
2216
2217         rc = lmv_check_connect(obd);
2218         if (rc)
2219                 RETURN(rc);
2220
2221         tgt = lmv_find_target(lmv, fid);
2222         if (IS_ERR(tgt))
2223                 RETURN(PTR_ERR(tgt));
2224
2225         rc = md_sync(tgt->ltd_exp, fid, oc, request);
2226         RETURN(rc);
2227 }
2228
2229 /**
2230  * Main purpose of LMV blocking ast is to remove split directory LMV
2231  * presentation object (struct lmv_object) attached to the lock being revoked.
2232  */
2233 int lmv_blocking_ast(struct ldlm_lock *lock, struct ldlm_lock_desc *desc,
2234                      void *data, int flag)
2235 {
2236         struct lustre_handle    lockh;
2237         struct lmv_object      *obj;
2238         int                     rc;
2239         ENTRY;
2240
2241         switch (flag) {
2242         case LDLM_CB_BLOCKING:
2243                 ldlm_lock2handle(lock, &lockh);
2244                 rc = ldlm_cli_cancel(&lockh);
2245                 if (rc < 0) {
2246                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
2247                         RETURN(rc);
2248                 }
2249                 break;
2250         case LDLM_CB_CANCELING:
2251                 /*
2252                  * Time to drop cached attrs for split directory object
2253                  */
2254                 obj = lock->l_ast_data;
2255                 if (obj) {
2256                         CDEBUG(D_INODE, "Cancel %s on "LPU64"/"LPU64
2257                                ", master "DFID"\n",
2258                                lock->l_resource->lr_name.name[3] == 1 ?
2259                                "LOOKUP" : "UPDATE",
2260                                lock->l_resource->lr_name.name[0],
2261                                lock->l_resource->lr_name.name[1],
2262                                PFID(&obj->lo_fid));
2263                         lmv_object_put(obj);
2264                 }
2265                 break;
2266         default:
2267                 LBUG();
2268         }
2269         RETURN(0);
2270 }
2271
2272 static void lmv_hash_adjust(__u64 *hash, __u64 hash_adj)
2273 {
2274         __u64         val;
2275
2276         val = le64_to_cpu(*hash);
2277         if (val < hash_adj)
2278                 val += MAX_HASH_SIZE;
2279         if (val != DIR_END_OFF)
2280                 *hash = cpu_to_le64(val - hash_adj);
2281 }
2282
2283 static __u32 lmv_node_rank(struct obd_export *exp, const struct lu_fid *fid)
2284 {
2285         __u64              id;
2286         struct obd_import *imp;
2287
2288         /*
2289          * XXX: to get nid we assume that underlying obd device is mdc.
2290          */
2291         imp  = class_exp2cliimp(exp);
2292         id   = imp->imp_connection->c_self + fid_flatten(fid);
2293
2294         CDEBUG(D_INODE, "Readpage node rank: "LPX64" "DFID" "LPX64" "LPX64"\n",
2295                imp->imp_connection->c_self, PFID(fid), id, id ^ (id >> 32));
2296
2297         return id ^ (id >> 32);
2298 }
2299
2300 static int lmv_readpage(struct obd_export *exp, const struct lu_fid *fid,
2301                         struct obd_capa *oc, __u64 offset64, struct page *page,
2302                         struct ptlrpc_request **request)
2303 {
2304         struct obd_device       *obd = exp->exp_obd;
2305         struct lmv_obd          *lmv = &obd->u.lmv;
2306         struct lu_fid            rid = *fid;
2307         struct lmv_object       *obj;
2308         __u64                    offset;
2309         __u64                    hash_adj = 0;
2310         __u32                    rank = 0;
2311         __u64                    seg_size = 0;
2312         __u64                    tgt_tmp = 0;
2313         int                      tgt_idx = 0;
2314         int                      tgt0_idx = 0;
2315         int                      rc;
2316         int                      nr = 0;
2317         struct lmv_stripe       *los;
2318         struct lmv_tgt_desc     *tgt;
2319         struct lu_dirpage       *dp;
2320         struct lu_dirent        *ent;
2321         ENTRY;
2322
2323         offset = offset64;
2324
2325         rc = lmv_check_connect(obd);
2326         if (rc)
2327                 RETURN(rc);
2328
2329         CDEBUG(D_INODE, "READPAGE at "LPX64" from "DFID"\n", offset, PFID(&rid));
2330
2331         /*
2332          * This case handle directory lookup in clustered metadata case (i.e.
2333          * split directory is located on multiple md servers.)
2334          * each server keeps directory entries for certain range of hashes.
2335          * E.g. we have N server and suppose hash range is 0 to MAX_HASH.
2336          * first server will keep records with hashes [ 0 ... MAX_HASH / N  - 1],
2337          * second one with hashes [MAX_HASH / N ... 2 * MAX_HASH / N] and
2338          * so on....
2339          *      readdir can simply start reading entries from 0 - N server in
2340          * order but that will not scale well as all client will request dir in
2341          * to server in same order.
2342          * Following algorithm does optimization:
2343          * Instead of doing readdir in 1, 2, ...., N order, client with a
2344          * rank R does readdir in R, R + 1, ..., N, 1, ... R - 1 order.
2345          * (every client has rank R)
2346          *      But ll_readdir() expect offset range [0 to MAX_HASH/N) but
2347          * since client ask dir from MDS{R} client has pages with offsets
2348          * [R*MAX_HASH/N ... (R + 1)*MAX_HASH/N] there for we do hash_adj
2349          * on hash  values that we get.
2350          */
2351         obj = lmv_object_find_lock(obd, fid);
2352         if (obj) {
2353                 nr       = obj->lo_objcount;
2354                 LASSERT(nr > 0);
2355                 seg_size = MAX_HASH_SIZE;
2356                 do_div(seg_size, nr);
2357                 los      = obj->lo_stripes;
2358                 tgt      = lmv_get_target(lmv, los[0].ls_mds);
2359                 rank     = lmv_node_rank(tgt->ltd_exp, fid) % nr;
2360                 tgt_tmp  = offset;
2361                 do_div(tgt_tmp, seg_size);
2362                 tgt0_idx = do_div(tgt_tmp,  nr);
2363                 tgt_idx  = (tgt0_idx + rank) % nr;
2364
2365                 if (tgt_idx < tgt0_idx)
2366                         /*
2367                          * Wrap around.
2368                          *
2369                          * Last segment has unusual length due to division
2370                          * rounding.
2371                          */
2372                         hash_adj = MAX_HASH_SIZE - seg_size * nr;
2373                 else
2374                         hash_adj = 0;
2375
2376                 hash_adj += rank * seg_size;
2377
2378                 CDEBUG(D_INODE, "Readpage hash adjustment: %x "LPX64" "
2379                        LPX64"/%x -> "LPX64"/%x\n", rank, hash_adj,
2380                        offset, tgt0_idx, offset + hash_adj, tgt_idx);
2381
2382                 offset = (offset + hash_adj) & MAX_HASH_SIZE;
2383                 rid = obj->lo_stripes[tgt_idx].ls_fid;
2384                 tgt = lmv_get_target(lmv, los[tgt_idx].ls_mds);
2385
2386                 CDEBUG(D_INODE, "Forward to "DFID" with offset %lu i %d\n",
2387                        PFID(&rid), (unsigned long)offset, tgt_idx);
2388         } else
2389                 tgt = lmv_find_target(lmv, &rid);
2390
2391         if (IS_ERR(tgt))
2392                 GOTO(cleanup, rc = PTR_ERR(tgt));
2393
2394         rc = md_readpage(tgt->ltd_exp, &rid, oc, offset, page, request);
2395         if (rc)
2396                 GOTO(cleanup, rc);
2397         if (obj) {
2398                 dp = cfs_kmap(page);
2399
2400                 lmv_hash_adjust(&dp->ldp_hash_start, hash_adj);
2401                 lmv_hash_adjust(&dp->ldp_hash_end,   hash_adj);
2402                 LASSERT(le64_to_cpu(dp->ldp_hash_start) <= offset64);
2403
2404                 for (ent = lu_dirent_start(dp); ent != NULL;
2405                      ent = lu_dirent_next(ent))
2406                         lmv_hash_adjust(&ent->lde_hash, hash_adj);
2407
2408                 if (tgt0_idx != nr - 1) {
2409                         __u64 end;
2410
2411                         end = le64_to_cpu(dp->ldp_hash_end);
2412                         if (end == DIR_END_OFF) {
2413                                 dp->ldp_hash_end = cpu_to_le32(seg_size *
2414                                                                (tgt0_idx + 1));
2415                                 CDEBUG(D_INODE,
2416                                        ""DFID" reset end "LPX64" tgt %d\n",
2417                                        PFID(&rid),
2418                                        le64_to_cpu(dp->ldp_hash_end), tgt_idx);
2419                         }
2420                 }
2421                 cfs_kunmap(page);
2422         }
2423         EXIT;
2424 cleanup:
2425         if (obj)
2426                 lmv_object_put_unlock(obj);
2427         return rc;
2428 }
2429
2430 static int lmv_unlink(struct obd_export *exp, struct md_op_data *op_data,
2431                       struct ptlrpc_request **request)
2432 {
2433         struct obd_device       *obd = exp->exp_obd;
2434         struct lmv_obd          *lmv = &obd->u.lmv;
2435         struct lmv_tgt_desc     *tgt = NULL;
2436         struct lmv_object       *obj;
2437         int                      rc;
2438         int                      sidx;
2439         int                      loop = 0;
2440         ENTRY;
2441
2442         rc = lmv_check_connect(obd);
2443         if (rc)
2444                 RETURN(rc);
2445
2446 repeat:
2447         ++loop;
2448         LASSERT(loop <= 2);
2449         LASSERT(op_data->op_namelen != 0);
2450
2451         obj = lmv_object_find(obd, &op_data->op_fid1);
2452         if (obj) {
2453                 sidx = raw_name2idx(obj->lo_hashtype,
2454                                     obj->lo_objcount,
2455                                     op_data->op_name,
2456                                     op_data->op_namelen);
2457                 op_data->op_bias &= ~MDS_CHECK_SPLIT;
2458                 op_data->op_fid1 = obj->lo_stripes[sidx].ls_fid;
2459                 tgt = lmv_get_target(lmv,
2460                                      obj->lo_stripes[sidx].ls_mds);
2461                 lmv_object_put(obj);
2462                 CDEBUG(D_INODE, "UNLINK '%*s' in "DFID" -> %u\n",
2463                        op_data->op_namelen, op_data->op_name,
2464                        PFID(&op_data->op_fid1), sidx);
2465         }
2466
2467         if (tgt == NULL) {
2468                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
2469                 if (IS_ERR(tgt))
2470                         RETURN(PTR_ERR(tgt));
2471                 op_data->op_bias |= MDS_CHECK_SPLIT;
2472         }
2473
2474         op_data->op_fsuid = cfs_curproc_fsuid();
2475         op_data->op_fsgid = cfs_curproc_fsgid();
2476         op_data->op_cap = cfs_curproc_cap_pack();
2477
2478         /*
2479          * If child's fid is given, cancel unused locks for it if it is from
2480          * another export than parent.
2481          *
2482          * LOOKUP lock for child (fid3) should also be cancelled on parent
2483          * tgt_tgt in mdc_unlink().
2484          */
2485         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2486
2487         /*
2488          * Cancel FULL locks on child (fid3).
2489          */
2490         rc = lmv_early_cancel(exp, op_data, tgt->ltd_idx, LCK_EX,
2491                               MDS_INODELOCK_FULL, MF_MDC_CANCEL_FID3);
2492
2493         if (rc == 0)
2494                 rc = md_unlink(tgt->ltd_exp, op_data, request);
2495
2496         if (rc == -ERESTART) {
2497                 LASSERT(*request != NULL);
2498                 DEBUG_REQ(D_WARNING|D_RPCTRACE, *request,
2499                           "Got -ERESTART during unlink!\n");
2500                 ptlrpc_req_finished(*request);
2501                 *request = NULL;
2502
2503                 /*
2504                  * Directory got split. Time to update local object and repeat
2505                  * the request with proper MDS.
2506                  */
2507                 rc = lmv_handle_split(exp, &op_data->op_fid1);
2508                 if (rc == 0)
2509                         goto repeat;
2510         }
2511         RETURN(rc);
2512 }
2513
2514 static int lmv_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
2515 {
2516         int        rc = 0;
2517
2518         switch (stage) {
2519         case OBD_CLEANUP_EARLY:
2520                 /* XXX: here should be calling obd_precleanup() down to
2521                  * stack. */
2522                 break;
2523         case OBD_CLEANUP_EXPORTS:
2524                 rc = obd_llog_finish(obd, 0);
2525                 if (rc != 0)
2526                         CERROR("failed to cleanup llogging subsystems\n");
2527                 break;
2528         default:
2529                 break;
2530         }
2531         RETURN(rc);
2532 }
2533
2534 static int lmv_get_info(struct obd_export *exp, __u32 keylen,
2535                         void *key, __u32 *vallen, void *val,
2536                         struct lov_stripe_md *lsm)
2537 {
2538         struct obd_device       *obd;
2539         struct lmv_obd          *lmv;
2540         int                      rc = 0;
2541         ENTRY;
2542
2543         obd = class_exp2obd(exp);
2544         if (obd == NULL) {
2545                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2546                        exp->exp_handle.h_cookie);
2547                 RETURN(-EINVAL);
2548         }
2549
2550         lmv = &obd->u.lmv;
2551         if (keylen >= strlen("remote_flag") && !strcmp(key, "remote_flag")) {
2552                 struct lmv_tgt_desc *tgts;
2553                 int i;
2554
2555                 rc = lmv_check_connect(obd);
2556                 if (rc)
2557                         RETURN(rc);
2558
2559                 LASSERT(*vallen == sizeof(__u32));
2560                 for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count;
2561                      i++, tgts++) {
2562
2563                         /*
2564                          * All tgts should be connected when this gets called.
2565                          */
2566                         if (!tgts || !tgts->ltd_exp) {
2567                                 CERROR("target not setup?\n");
2568                                 continue;
2569                         }
2570
2571                         if (!obd_get_info(tgts->ltd_exp, keylen, key,
2572                                           vallen, val, NULL))
2573                                 RETURN(0);
2574                 }
2575                 RETURN(-EINVAL);
2576         } else if (KEY_IS(KEY_MAX_EASIZE) || KEY_IS(KEY_CONN_DATA)) {
2577                 rc = lmv_check_connect(obd);
2578                 if (rc)
2579                         RETURN(rc);
2580
2581                 /*
2582                  * Forwarding this request to first MDS, it should know LOV
2583                  * desc.
2584                  */
2585                 rc = obd_get_info(lmv->tgts[0].ltd_exp, keylen, key,
2586                                   vallen, val, NULL);
2587                 if (!rc && KEY_IS(KEY_CONN_DATA)) {
2588                         exp->exp_connect_flags =
2589                         ((struct obd_connect_data *)val)->ocd_connect_flags;
2590                 }
2591                 RETURN(rc);
2592         }
2593
2594         CDEBUG(D_IOCTL, "Invalid key\n");
2595         RETURN(-EINVAL);
2596 }
2597
2598 int lmv_set_info_async(struct obd_export *exp, obd_count keylen,
2599                        void *key, obd_count vallen, void *val,
2600                        struct ptlrpc_request_set *set)
2601 {
2602         struct lmv_tgt_desc    *tgt;
2603         struct obd_device      *obd;
2604         struct lmv_obd         *lmv;
2605         int rc = 0;
2606         ENTRY;
2607
2608         obd = class_exp2obd(exp);
2609         if (obd == NULL) {
2610                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2611                        exp->exp_handle.h_cookie);
2612                 RETURN(-EINVAL);
2613         }
2614         lmv = &obd->u.lmv;
2615
2616         if (KEY_IS(KEY_READ_ONLY) || KEY_IS(KEY_FLUSH_CTX) ||
2617             KEY_IS(KEY_INIT_RECOV_BACKUP)) {
2618                 int i, err = 0;
2619
2620                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2621                         tgt = &lmv->tgts[i];
2622
2623                         if (!tgt->ltd_exp)
2624                                 continue;
2625
2626                         err = obd_set_info_async(tgt->ltd_exp,
2627                                                  keylen, key, vallen, val, set);
2628                         if (err && rc == 0)
2629                                 rc = err;
2630                 }
2631
2632                 RETURN(rc);
2633         }
2634
2635         RETURN(-EINVAL);
2636 }
2637
2638 int lmv_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
2639                struct lov_stripe_md *lsm)
2640 {
2641         struct obd_device         *obd = class_exp2obd(exp);
2642         struct lmv_obd            *lmv = &obd->u.lmv;
2643         struct lmv_stripe_md      *meap;
2644         struct lmv_stripe_md      *lsmp;
2645         int                        mea_size;
2646         int                        i;
2647         ENTRY;
2648
2649         mea_size = lmv_get_easize(lmv);
2650         if (!lmmp)
2651                 RETURN(mea_size);
2652
2653         if (*lmmp && !lsm) {
2654                 OBD_FREE(*lmmp, mea_size);
2655                 *lmmp = NULL;
2656                 RETURN(0);
2657         }
2658
2659         if (*lmmp == NULL) {
2660                 OBD_ALLOC(*lmmp, mea_size);
2661                 if (*lmmp == NULL)
2662                         RETURN(-ENOMEM);
2663         }
2664
2665         if (!lsm)
2666                 RETURN(mea_size);
2667
2668         lsmp = (struct lmv_stripe_md *)lsm;
2669         meap = (struct lmv_stripe_md *)*lmmp;
2670
2671         if (lsmp->mea_magic != MEA_MAGIC_LAST_CHAR &&
2672             lsmp->mea_magic != MEA_MAGIC_ALL_CHARS)
2673                 RETURN(-EINVAL);
2674
2675         meap->mea_magic = cpu_to_le32(lsmp->mea_magic);
2676         meap->mea_count = cpu_to_le32(lsmp->mea_count);
2677         meap->mea_master = cpu_to_le32(lsmp->mea_master);
2678
2679         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2680                 meap->mea_ids[i] = meap->mea_ids[i];
2681                 fid_cpu_to_le(&meap->mea_ids[i], &meap->mea_ids[i]);
2682         }
2683
2684         RETURN(mea_size);
2685 }
2686
2687 int lmv_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
2688                  struct lov_mds_md *lmm, int lmm_size)
2689 {
2690         struct obd_device          *obd = class_exp2obd(exp);
2691         struct lmv_stripe_md      **tmea = (struct lmv_stripe_md **)lsmp;
2692         struct lmv_stripe_md       *mea = (struct lmv_stripe_md *)lmm;
2693         struct lmv_obd             *lmv = &obd->u.lmv;
2694         int                         mea_size;
2695         int                         i;
2696         __u32                       magic;
2697         ENTRY;
2698
2699         mea_size = lmv_get_easize(lmv);
2700         if (lsmp == NULL)
2701                 return mea_size;
2702
2703         if (*lsmp != NULL && lmm == NULL) {
2704                 OBD_FREE(*tmea, mea_size);
2705                 *lsmp = NULL;
2706                 RETURN(0);
2707         }
2708
2709         LASSERT(mea_size == lmm_size);
2710
2711         OBD_ALLOC(*tmea, mea_size);
2712         if (*tmea == NULL)
2713                 RETURN(-ENOMEM);
2714
2715         if (!lmm)
2716                 RETURN(mea_size);
2717
2718         if (mea->mea_magic == MEA_MAGIC_LAST_CHAR ||
2719             mea->mea_magic == MEA_MAGIC_ALL_CHARS ||
2720             mea->mea_magic == MEA_MAGIC_HASH_SEGMENT)
2721         {
2722                 magic = le32_to_cpu(mea->mea_magic);
2723         } else {
2724                 /*
2725                  * Old mea is not handled here.
2726                  */
2727                 CERROR("Old not supportable EA is found\n");
2728                 LBUG();
2729         }
2730
2731         (*tmea)->mea_magic = magic;
2732         (*tmea)->mea_count = le32_to_cpu(mea->mea_count);
2733         (*tmea)->mea_master = le32_to_cpu(mea->mea_master);
2734
2735         for (i = 0; i < (*tmea)->mea_count; i++) {
2736                 (*tmea)->mea_ids[i] = mea->mea_ids[i];
2737                 fid_le_to_cpu(&(*tmea)->mea_ids[i], &(*tmea)->mea_ids[i]);
2738         }
2739         RETURN(mea_size);
2740 }
2741
2742 static int lmv_cancel_unused(struct obd_export *exp, const struct lu_fid *fid,
2743                              ldlm_policy_data_t *policy, ldlm_mode_t mode,
2744                              int flags, void *opaque)
2745 {
2746         struct obd_device       *obd = exp->exp_obd;
2747         struct lmv_obd          *lmv = &obd->u.lmv;
2748         int                      rc = 0;
2749         int                      err;
2750         int                      i;
2751         ENTRY;
2752
2753         LASSERT(fid != NULL);
2754
2755         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2756                 if (!lmv->tgts[i].ltd_exp || !lmv->tgts[i].ltd_active)
2757                         continue;
2758
2759                 err = md_cancel_unused(lmv->tgts[i].ltd_exp, fid,
2760                                        policy, mode, flags, opaque);
2761                 if (!rc)
2762                         rc = err;
2763         }
2764         RETURN(rc);
2765 }
2766
2767 int lmv_set_lock_data(struct obd_export *exp, __u64 *lockh, void *data,
2768                       __u32 *bits)
2769 {
2770         struct obd_device       *obd = exp->exp_obd;
2771         struct lmv_obd          *lmv = &obd->u.lmv;
2772         int                      rc;
2773         ENTRY;
2774
2775         rc =  md_set_lock_data(lmv->tgts[0].ltd_exp, lockh, data, bits);
2776         RETURN(rc);
2777 }
2778
2779 ldlm_mode_t lmv_lock_match(struct obd_export *exp, int flags,
2780                            const struct lu_fid *fid, ldlm_type_t type,
2781                            ldlm_policy_data_t *policy, ldlm_mode_t mode,
2782                            struct lustre_handle *lockh)
2783 {
2784         struct obd_device       *obd = exp->exp_obd;
2785         struct lmv_obd          *lmv = &obd->u.lmv;
2786         ldlm_mode_t              rc;
2787         int                      i;
2788         ENTRY;
2789
2790         CDEBUG(D_INODE, "Lock match for "DFID"\n", PFID(fid));
2791
2792         /*
2793          * With CMD every object can have two locks in different namespaces:
2794          * lookup lock in space of mds storing direntry and update/open lock in
2795          * space of mds storing inode. Thus we check all targets, not only that
2796          * one fid was created in.
2797          */
2798         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2799                 rc = md_lock_match(lmv->tgts[i].ltd_exp, flags, fid,
2800                                    type, policy, mode, lockh);
2801                 if (rc)
2802                         RETURN(rc);
2803         }
2804
2805         RETURN(0);
2806 }
2807
2808 int lmv_get_lustre_md(struct obd_export *exp, struct ptlrpc_request *req,
2809                       struct obd_export *dt_exp, struct obd_export *md_exp,
2810                       struct lustre_md *md)
2811 {
2812         struct obd_device       *obd = exp->exp_obd;
2813         struct lmv_obd          *lmv = &obd->u.lmv;
2814         int                      rc;
2815         ENTRY;
2816         rc = md_get_lustre_md(lmv->tgts[0].ltd_exp, req, dt_exp, md_exp, md);
2817         RETURN(rc);
2818 }
2819
2820 int lmv_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
2821 {
2822         struct obd_device       *obd = exp->exp_obd;
2823         struct lmv_obd          *lmv = &obd->u.lmv;
2824         ENTRY;
2825
2826         if (md->mea)
2827                 obd_free_memmd(exp, (void *)&md->mea);
2828         RETURN(md_free_lustre_md(lmv->tgts[0].ltd_exp, md));
2829 }
2830
2831 int lmv_set_open_replay_data(struct obd_export *exp,
2832                              struct obd_client_handle *och,
2833                              struct ptlrpc_request *open_req)
2834 {
2835         struct obd_device       *obd = exp->exp_obd;
2836         struct lmv_obd          *lmv = &obd->u.lmv;
2837         struct lmv_tgt_desc     *tgt;
2838         ENTRY;
2839
2840         tgt = lmv_find_target(lmv, &och->och_fid);
2841         if (IS_ERR(tgt))
2842                 RETURN(PTR_ERR(tgt));
2843
2844         RETURN(md_set_open_replay_data(tgt->ltd_exp, och, open_req));
2845 }
2846
2847 int lmv_clear_open_replay_data(struct obd_export *exp,
2848                                struct obd_client_handle *och)
2849 {
2850         struct obd_device       *obd = exp->exp_obd;
2851         struct lmv_obd          *lmv = &obd->u.lmv;
2852         struct lmv_tgt_desc     *tgt;
2853         ENTRY;
2854
2855         tgt = lmv_find_target(lmv, &och->och_fid);
2856         if (IS_ERR(tgt))
2857                 RETURN(PTR_ERR(tgt));
2858
2859         RETURN(md_clear_open_replay_data(tgt->ltd_exp, och));
2860 }
2861
2862 static int lmv_get_remote_perm(struct obd_export *exp,
2863                                const struct lu_fid *fid,
2864                                struct obd_capa *oc, __u32 suppgid,
2865                                struct ptlrpc_request **request)
2866 {
2867         struct obd_device       *obd = exp->exp_obd;
2868         struct lmv_obd          *lmv = &obd->u.lmv;
2869         struct lmv_tgt_desc     *tgt;
2870         int                      rc;
2871         ENTRY;
2872
2873         rc = lmv_check_connect(obd);
2874         if (rc)
2875                 RETURN(rc);
2876
2877         tgt = lmv_find_target(lmv, fid);
2878         if (IS_ERR(tgt))
2879                 RETURN(PTR_ERR(tgt));
2880
2881         rc = md_get_remote_perm(tgt->ltd_exp, fid, oc, suppgid, request);
2882         RETURN(rc);
2883 }
2884
2885 static int lmv_renew_capa(struct obd_export *exp, struct obd_capa *oc,
2886                           renew_capa_cb_t cb)
2887 {
2888         struct obd_device       *obd = exp->exp_obd;
2889         struct lmv_obd          *lmv = &obd->u.lmv;
2890         struct lmv_tgt_desc     *tgt;
2891         int                      rc;
2892         ENTRY;
2893
2894         rc = lmv_check_connect(obd);
2895         if (rc)
2896                 RETURN(rc);
2897
2898         tgt = lmv_find_target(lmv, &oc->c_capa.lc_fid);
2899         if (IS_ERR(tgt))
2900                 RETURN(PTR_ERR(tgt));
2901
2902         rc = md_renew_capa(tgt->ltd_exp, oc, cb);
2903         RETURN(rc);
2904 }
2905
2906 int lmv_unpack_capa(struct obd_export *exp, struct ptlrpc_request *req,
2907                     const struct req_msg_field *field, struct obd_capa **oc)
2908 {
2909         struct obd_device *obd = exp->exp_obd;
2910         struct lmv_obd *lmv = &obd->u.lmv;
2911         int rc;
2912
2913         ENTRY;
2914         rc = md_unpack_capa(lmv->tgts[0].ltd_exp, req, field, oc);
2915         RETURN(rc);
2916 }
2917
2918 int lmv_intent_getattr_async(struct obd_export *exp,
2919                              struct md_enqueue_info *minfo,
2920                              struct ldlm_enqueue_info *einfo)
2921 {
2922         struct md_op_data       *op_data = &minfo->mi_data;
2923         struct obd_device       *obd = exp->exp_obd;
2924         struct lmv_obd          *lmv = &obd->u.lmv;
2925         struct lmv_object       *obj;
2926         struct lmv_tgt_desc     *tgt;
2927         int                      rc;
2928         int                      sidx;
2929         ENTRY;
2930
2931         rc = lmv_check_connect(obd);
2932         if (rc)
2933                 RETURN(rc);
2934
2935         if (!fid_is_sane(&op_data->op_fid2)) {
2936                 obj = lmv_object_find(obd, &op_data->op_fid1);
2937                 if (obj && op_data->op_namelen) {
2938                         sidx = raw_name2idx(obj->lo_hashtype,
2939                                             obj->lo_objcount,
2940                                             (char *)op_data->op_name,
2941                                             op_data->op_namelen);
2942                         op_data->op_fid1 = obj->lo_stripes[sidx].ls_fid;
2943                         tgt = lmv_get_target(lmv,
2944                                              obj->lo_stripes[sidx].ls_mds);
2945                         CDEBUG(D_INODE,
2946                                "Choose slave dir ("DFID") -> mds #%d\n",
2947                                PFID(&op_data->op_fid1), tgt->ltd_idx);
2948                 } else {
2949                         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2950                 }
2951                 if (obj)
2952                         lmv_object_put(obj);
2953         } else {
2954                 op_data->op_fid1 = op_data->op_fid2;
2955                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
2956                 op_data->op_bias = MDS_CROSS_REF;
2957                 /*
2958                  * Unfortunately, we have to lie to MDC/MDS to retrieve
2959                  * attributes llite needs.
2960                 */
2961                 if (minfo->mi_it.it_op & IT_LOOKUP)
2962                         minfo->mi_it.it_op = IT_GETATTR;
2963         }
2964
2965         if (IS_ERR(tgt))
2966                 RETURN(PTR_ERR(tgt));
2967
2968         rc = md_intent_getattr_async(tgt->ltd_exp, minfo, einfo);
2969         RETURN(rc);
2970 }
2971
2972 int lmv_revalidate_lock(struct obd_export *exp,
2973                         struct lookup_intent *it,
2974                         struct lu_fid *fid)
2975 {
2976         struct obd_device       *obd = exp->exp_obd;
2977         struct lmv_obd          *lmv = &obd->u.lmv;
2978         struct lmv_tgt_desc     *tgt;
2979         int                      rc;
2980         ENTRY;
2981
2982         rc = lmv_check_connect(obd);
2983         if (rc)
2984                 RETURN(rc);
2985
2986         tgt = lmv_find_target(lmv, fid);
2987         if (IS_ERR(tgt))
2988                 RETURN(PTR_ERR(tgt));
2989
2990         rc = md_revalidate_lock(tgt->ltd_exp, it, fid);
2991         RETURN(rc);
2992 }
2993
2994
2995 struct obd_ops lmv_obd_ops = {
2996         .o_owner                = THIS_MODULE,
2997         .o_setup                = lmv_setup,
2998         .o_cleanup              = lmv_cleanup,
2999         .o_precleanup           = lmv_precleanup,
3000         .o_process_config       = lmv_process_config,
3001         .o_connect              = lmv_connect,
3002         .o_disconnect           = lmv_disconnect,
3003         .o_statfs               = lmv_statfs,
3004         .o_get_info             = lmv_get_info,
3005         .o_set_info_async       = lmv_set_info_async,
3006         .o_packmd               = lmv_packmd,
3007         .o_unpackmd             = lmv_unpackmd,
3008         .o_notify               = lmv_notify,
3009         .o_get_uuid             = lmv_get_uuid,
3010         .o_iocontrol            = lmv_iocontrol,
3011         .o_fid_delete           = lmv_fid_delete
3012 };
3013
3014 struct md_ops lmv_md_ops = {
3015         .m_getstatus            = lmv_getstatus,
3016         .m_change_cbdata        = lmv_change_cbdata,
3017         .m_close                = lmv_close,
3018         .m_create               = lmv_create,
3019         .m_done_writing         = lmv_done_writing,
3020         .m_enqueue              = lmv_enqueue,
3021         .m_getattr              = lmv_getattr,
3022         .m_getxattr             = lmv_getxattr,
3023         .m_getattr_name         = lmv_getattr_name,
3024         .m_intent_lock          = lmv_intent_lock,
3025         .m_link                 = lmv_link,
3026         .m_rename               = lmv_rename,
3027         .m_setattr              = lmv_setattr,
3028         .m_setxattr             = lmv_setxattr,
3029         .m_sync                 = lmv_sync,
3030         .m_readpage             = lmv_readpage,
3031         .m_unlink               = lmv_unlink,
3032         .m_init_ea_size         = lmv_init_ea_size,
3033         .m_cancel_unused        = lmv_cancel_unused,
3034         .m_set_lock_data        = lmv_set_lock_data,
3035         .m_lock_match           = lmv_lock_match,
3036         .m_get_lustre_md        = lmv_get_lustre_md,
3037         .m_free_lustre_md       = lmv_free_lustre_md,
3038         .m_set_open_replay_data = lmv_set_open_replay_data,
3039         .m_clear_open_replay_data = lmv_clear_open_replay_data,
3040         .m_renew_capa           = lmv_renew_capa,
3041         .m_unpack_capa          = lmv_unpack_capa,
3042         .m_get_remote_perm      = lmv_get_remote_perm,
3043         .m_intent_getattr_async = lmv_intent_getattr_async,
3044         .m_revalidate_lock      = lmv_revalidate_lock
3045 };
3046
3047 static quota_interface_t *quota_interface;
3048 extern quota_interface_t lmv_quota_interface;
3049
3050 int __init lmv_init(void)
3051 {
3052         struct lprocfs_static_vars lvars;
3053         int                        rc;
3054
3055         lmv_object_cache = cfs_mem_cache_create("lmv_objects",
3056                                                 sizeof(struct lmv_object),
3057                                                 0, 0);
3058         if (!lmv_object_cache) {
3059                 CERROR("Error allocating lmv objects cache\n");
3060                 return -ENOMEM;
3061         }
3062
3063         lprocfs_lmv_init_vars(&lvars);
3064
3065         cfs_request_module("lquota");
3066         quota_interface = PORTAL_SYMBOL_GET(lmv_quota_interface);
3067         init_obd_quota_ops(quota_interface, &lmv_obd_ops);
3068
3069         rc = class_register_type(&lmv_obd_ops, &lmv_md_ops,
3070                                  lvars.module_vars, LUSTRE_LMV_NAME, NULL);
3071         if (rc) {
3072                 if (quota_interface)
3073                         PORTAL_SYMBOL_PUT(lmv_quota_interface);
3074                 cfs_mem_cache_destroy(lmv_object_cache);
3075         }
3076
3077         return rc;
3078 }
3079
3080 #ifdef __KERNEL__
3081 static void lmv_exit(void)
3082 {
3083         if (quota_interface)
3084                 PORTAL_SYMBOL_PUT(lmv_quota_interface);
3085
3086         class_unregister_type(LUSTRE_LMV_NAME);
3087
3088         LASSERTF(cfs_atomic_read(&lmv_object_count) == 0,
3089                  "Can't free lmv objects cache, %d object(s) busy\n",
3090                  cfs_atomic_read(&lmv_object_count));
3091         cfs_mem_cache_destroy(lmv_object_cache);
3092 }
3093
3094 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
3095 MODULE_DESCRIPTION("Lustre Logical Metadata Volume OBD driver");
3096 MODULE_LICENSE("GPL");
3097
3098 module_init(lmv_init);
3099 module_exit(lmv_exit);
3100 #endif