lustre/lmv/lmv_obd.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2014, Intel Corporation.
  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 #define DEBUG_SUBSYSTEM S_LMV
  38 #include <linux/slab.h>
  39 #include <linux/module.h>
  40 #include <linux/init.h>
  41 #include <linux/slab.h>
  42 #include <linux/pagemap.h>
  43 #include <linux/mm.h>
  44 #include <linux/math64.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/namei.h>
  47
  48 #include <lustre/lustre_idl.h>
  49 #include <obd_support.h>
  50 #include <lustre_lib.h>
  51 #include <lustre_net.h>
  52 #include <obd_class.h>
  53 #include <lustre_lmv.h>
  54 #include <lprocfs_status.h>
  55 #include <cl_object.h>
  56 #include <lustre_fid.h>
  57 #include <lustre_ioctl.h>
  58 #include "lmv_internal.h"
  59
  60 static void lmv_activate_target(struct lmv_obd *lmv,
  61                                 struct lmv_tgt_desc *tgt,
  62                                 int activate)
  63 {
  64         if (tgt->ltd_active == activate)
  65                 return;
  66
  67         tgt->ltd_active = activate;
  68         lmv->desc.ld_active_tgt_count += (activate ? 1 : -1);
  69 }
  70
  71 /**
  72  * Error codes:
  73  *
  74  *  -EINVAL  : UUID can't be found in the LMV's target list
  75  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
  76  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
  77  */
  78 static int lmv_set_mdc_active(struct lmv_obd *lmv,
  79                               const struct obd_uuid *uuid,
  80                               int activate)
  81 {
  82         struct lmv_tgt_desc     *tgt = NULL;
  83         struct obd_device       *obd;
  84         __u32                    i;
  85         int                      rc = 0;
  86         ENTRY;
  87
  88         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
  89                         lmv, uuid->uuid, activate);
  90
  91         spin_lock(&lmv->lmv_lock);
  92         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
  93                 tgt = lmv->tgts[i];
  94                 if (tgt == NULL || tgt->ltd_exp == NULL)
  95                         continue;
  96
  97                 CDEBUG(D_INFO, "Target idx %d is %s conn "LPX64"\n", i,
  98                        tgt->ltd_uuid.uuid, tgt->ltd_exp->exp_handle.h_cookie);
  99
 100                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 101                         break;
 102         }
 103
 104         if (i == lmv->desc.ld_tgt_count)
 105                 GOTO(out_lmv_lock, rc = -EINVAL);
 106
 107         obd = class_exp2obd(tgt->ltd_exp);
 108         if (obd == NULL)
 109                 GOTO(out_lmv_lock, rc = -ENOTCONN);
 110
 111         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
 112                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
 113                obd->obd_type->typ_name, i);
 114         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0);
 115
 116         if (tgt->ltd_active == activate) {
 117                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
 118                        activate ? "" : "in");
 119                 GOTO(out_lmv_lock, rc);
 120         }
 121
 122         CDEBUG(D_INFO, "Marking OBD %p %sactive\n", obd,
 123                activate ? "" : "in");
 124         lmv_activate_target(lmv, tgt, activate);
 125         EXIT;
 126
 127  out_lmv_lock:
 128         spin_unlock(&lmv->lmv_lock);
 129         return rc;
 130 }
 131
 132 struct obd_uuid *lmv_get_uuid(struct obd_export *exp)
 133 {
 134         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
 135         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
 136
 137         return (tgt == NULL) ? NULL : obd_get_uuid(tgt->ltd_exp);
 138 }
 139
 140 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
 141                       enum obd_notify_event ev, void *data)
 142 {
 143         struct obd_connect_data *conn_data;
 144         struct lmv_obd          *lmv = &obd->u.lmv;
 145         struct obd_uuid         *uuid;
 146         int                      rc = 0;
 147         ENTRY;
 148
 149         if (strcmp(watched->obd_type->typ_name, LUSTRE_MDC_NAME)) {
 150                 CERROR("unexpected notification of %s %s!\n",
 151                        watched->obd_type->typ_name,
 152                        watched->obd_name);
 153                 RETURN(-EINVAL);
 154         }
 155
 156         uuid = &watched->u.cli.cl_target_uuid;
 157         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE) {
 158                 /*
 159                  * Set MDC as active before notifying the observer, so the
 160                  * observer can use the MDC normally.
 161                  */
 162                 rc = lmv_set_mdc_active(lmv, uuid,
 163                                         ev == OBD_NOTIFY_ACTIVE);
 164                 if (rc) {
 165                         CERROR("%sactivation of %s failed: %d\n",
 166                                ev == OBD_NOTIFY_ACTIVE ? "" : "de",
 167                                uuid->uuid, rc);
 168                         RETURN(rc);
 169                 }
 170         } else if (ev == OBD_NOTIFY_OCD) {
 171                 conn_data = &watched->u.cli.cl_import->imp_connect_data;
 172                 /*
 173                  * XXX: Make sure that ocd_connect_flags from all targets are
 174                  * the same. Otherwise one of MDTs runs wrong version or
 175                  * something like this.  --umka
 176                  */
 177                 obd->obd_self_export->exp_connect_data = *conn_data;
 178         }
 179 #if 0
 180         else if (ev == OBD_NOTIFY_DISCON) {
 181                 /*
 182                  * For disconnect event, flush fld cache for failout MDS case.
 183                  */
 184                 fld_client_flush(&lmv->lmv_fld);
 185         }
 186 #endif
 187         /*
 188          * Pass the notification up the chain.
 189          */
 190         if (obd->obd_observer)
 191                 rc = obd_notify(obd->obd_observer, watched, ev, data);
 192
 193         RETURN(rc);
 194 }
 195
 196 /**
 197  * This is fake connect function. Its purpose is to initialize lmv and say
 198  * caller that everything is okay. Real connection will be performed later.
 199  */
 200 static int lmv_connect(const struct lu_env *env,
 201                        struct obd_export **exp, struct obd_device *obd,
 202                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 203                        void *localdata)
 204 {
 205         struct lmv_obd        *lmv = &obd->u.lmv;
 206         struct lustre_handle  conn = { 0 };
 207         int                    rc = 0;
 208         ENTRY;
 209
 210         /*
 211          * We don't want to actually do the underlying connections more than
 212          * once, so keep track.
 213          */
 214         lmv->refcount++;
 215         if (lmv->refcount > 1) {
 216                 *exp = NULL;
 217                 RETURN(0);
 218         }
 219
 220         rc = class_connect(&conn, obd, cluuid);
 221         if (rc) {
 222                 CERROR("class_connection() returned %d\n", rc);
 223                 RETURN(rc);
 224         }
 225
 226         *exp = class_conn2export(&conn);
 227         class_export_get(*exp);
 228
 229         lmv->exp = *exp;
 230         lmv->connected = 0;
 231         lmv->cluuid = *cluuid;
 232
 233         if (data)
 234                 lmv->conn_data = *data;
 235
 236         if (lmv->targets_proc_entry == NULL) {
 237                 lmv->targets_proc_entry = lprocfs_register("target_obds",
 238                                                            obd->obd_proc_entry,
 239                                                            NULL, NULL);
 240                 if (IS_ERR(lmv->targets_proc_entry)) {
 241                         CERROR("%s: cannot register "
 242                                "/proc/fs/lustre/%s/%s/target_obds\n",
 243                                obd->obd_name, obd->obd_type->typ_name,
 244                                obd->obd_name);
 245                         lmv->targets_proc_entry = NULL;
 246                 }
 247         }
 248
 249         /*
 250          * All real clients should perform actual connection right away, because
 251          * it is possible, that LMV will not have opportunity to connect targets
 252          * and MDC stuff will be called directly, for instance while reading
 253          * ../mdc/../kbytesfree procfs file, etc.
 254          */
 255         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_REAL))
 256                 rc = lmv_check_connect(obd);
 257
 258         if (rc && lmv->targets_proc_entry != NULL)
 259                 lprocfs_remove(&lmv->targets_proc_entry);
 260         RETURN(rc);
 261 }
 262
 263 static int lmv_init_ea_size(struct obd_export *exp,
 264                             __u32 easize, __u32 def_easize,
 265                             __u32 cookiesize, __u32 def_cookiesize)
 266 {
 267         struct obd_device       *obd = exp->exp_obd;
 268         struct lmv_obd          *lmv = &obd->u.lmv;
 269         __u32                    i;
 270         int                      rc = 0;
 271         int                      change = 0;
 272         ENTRY;
 273
 274         if (lmv->max_easize < easize) {
 275                 lmv->max_easize = easize;
 276                 change = 1;
 277         }
 278         if (lmv->max_def_easize < def_easize) {
 279                 lmv->max_def_easize = def_easize;
 280                 change = 1;
 281         }
 282         if (lmv->max_cookiesize < cookiesize) {
 283                 lmv->max_cookiesize = cookiesize;
 284                 change = 1;
 285         }
 286         if (lmv->max_def_cookiesize < def_cookiesize) {
 287                 lmv->max_def_cookiesize = def_cookiesize;
 288                 change = 1;
 289         }
 290         if (change == 0)
 291                 RETURN(0);
 292
 293         if (lmv->connected == 0)
 294                 RETURN(0);
 295
 296         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 297                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 298
 299                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active) {
 300                         CWARN("%s: NULL export for %d\n", obd->obd_name, i);
 301                         continue;
 302                 }
 303
 304                 rc = md_init_ea_size(tgt->ltd_exp, easize, def_easize,
 305                                      cookiesize, def_cookiesize);
 306                 if (rc) {
 307                         CERROR("%s: obd_init_ea_size() failed on MDT target %d:"
 308                                " rc = %d\n", obd->obd_name, i, rc);
 309                         break;
 310                 }
 311         }
 312         RETURN(rc);
 313 }
 314
 315 #define MAX_STRING_SIZE 128
 316
 317 int lmv_connect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 318 {
 319         struct lmv_obd          *lmv = &obd->u.lmv;
 320         struct obd_uuid         *cluuid = &lmv->cluuid;
 321         struct obd_uuid          lmv_mdc_uuid = { "LMV_MDC_UUID" };
 322         struct obd_device       *mdc_obd;
 323         struct obd_export       *mdc_exp;
 324         struct lu_fld_target     target;
 325         int                      rc;
 326         ENTRY;
 327
 328         mdc_obd = class_find_client_obd(&tgt->ltd_uuid, LUSTRE_MDC_NAME,
 329                                         &obd->obd_uuid);
 330         if (!mdc_obd) {
 331                 CERROR("target %s not attached\n", tgt->ltd_uuid.uuid);
 332                 RETURN(-EINVAL);
 333         }
 334
 335         CDEBUG(D_CONFIG, "connect to %s(%s) - %s, %s FOR %s\n",
 336                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 337                 tgt->ltd_uuid.uuid, obd->obd_uuid.uuid,
 338                 cluuid->uuid);
 339
 340         if (!mdc_obd->obd_set_up) {
 341                 CERROR("target %s is not set up\n", tgt->ltd_uuid.uuid);
 342                 RETURN(-EINVAL);
 343         }
 344
 345         rc = obd_connect(NULL, &mdc_exp, mdc_obd, &lmv_mdc_uuid,
 346                          &lmv->conn_data, NULL);
 347         if (rc) {
 348                 CERROR("target %s connect error %d\n", tgt->ltd_uuid.uuid, rc);
 349                 RETURN(rc);
 350         }
 351
 352         /*
 353          * Init fid sequence client for this mdc and add new fld target.
 354          */
 355         rc = obd_fid_init(mdc_obd, mdc_exp, LUSTRE_SEQ_METADATA);
 356         if (rc)
 357                 RETURN(rc);
 358
 359         target.ft_srv = NULL;
 360         target.ft_exp = mdc_exp;
 361         target.ft_idx = tgt->ltd_idx;
 362
 363         fld_client_add_target(&lmv->lmv_fld, &target);
 364
 365         rc = obd_register_observer(mdc_obd, obd);
 366         if (rc) {
 367                 obd_disconnect(mdc_exp);
 368                 CERROR("target %s register_observer error %d\n",
 369                        tgt->ltd_uuid.uuid, rc);
 370                 RETURN(rc);
 371         }
 372
 373         if (obd->obd_observer) {
 374                 /*
 375                  * Tell the observer about the new target.
 376                  */
 377                 rc = obd_notify(obd->obd_observer, mdc_exp->exp_obd,
 378                                 OBD_NOTIFY_ACTIVE,
 379                                 (void *)(tgt - lmv->tgts[0]));
 380                 if (rc) {
 381                         obd_disconnect(mdc_exp);
 382                         RETURN(rc);
 383                 }
 384         }
 385
 386         tgt->ltd_active = 1;
 387         tgt->ltd_exp = mdc_exp;
 388         lmv->desc.ld_active_tgt_count++;
 389
 390         md_init_ea_size(tgt->ltd_exp, lmv->max_easize, lmv->max_def_easize,
 391                         lmv->max_cookiesize, lmv->max_def_cookiesize);
 392
 393         CDEBUG(D_CONFIG, "Connected to %s(%s) successfully (%d)\n",
 394                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 395                 atomic_read(&obd->obd_refcount));
 396
 397         if (lmv->targets_proc_entry != NULL) {
 398                 struct proc_dir_entry *mdc_symlink;
 399
 400                 LASSERT(mdc_obd->obd_type != NULL);
 401                 LASSERT(mdc_obd->obd_type->typ_name != NULL);
 402                 mdc_symlink = lprocfs_add_symlink(mdc_obd->obd_name,
 403                                                   lmv->targets_proc_entry,
 404                                                   "../../../%s/%s",
 405                                                   mdc_obd->obd_type->typ_name,
 406                                                   mdc_obd->obd_name);
 407                 if (mdc_symlink == NULL) {
 408                         CERROR("cannot register LMV target "
 409                                "/proc/fs/lustre/%s/%s/target_obds/%s\n",
 410                                obd->obd_type->typ_name, obd->obd_name,
 411                                mdc_obd->obd_name);
 412                 }
 413         }
 414         RETURN(0);
 415 }
 416
 417 static void lmv_del_target(struct lmv_obd *lmv, int index)
 418 {
 419         if (lmv->tgts[index] == NULL)
 420                 return;
 421
 422         OBD_FREE_PTR(lmv->tgts[index]);
 423         lmv->tgts[index] = NULL;
 424         return;
 425 }
 426
 427 static int lmv_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 428                            __u32 index, int gen)
 429 {
 430         struct lmv_obd      *lmv = &obd->u.lmv;
 431         struct lmv_tgt_desc *tgt;
 432         int                  orig_tgt_count = 0;
 433         int                  rc = 0;
 434         ENTRY;
 435
 436         CDEBUG(D_CONFIG, "Target uuid: %s. index %d\n", uuidp->uuid, index);
 437
 438         mutex_lock(&lmv->lmv_init_mutex);
 439
 440         if (lmv->desc.ld_tgt_count == 0) {
 441                 struct obd_device *mdc_obd;
 442
 443                 mdc_obd = class_find_client_obd(uuidp, LUSTRE_MDC_NAME,
 444                                                 &obd->obd_uuid);
 445                 if (!mdc_obd) {
 446                         mutex_unlock(&lmv->lmv_init_mutex);
 447                         CERROR("%s: Target %s not attached: rc = %d\n",
 448                                obd->obd_name, uuidp->uuid, -EINVAL);
 449                         RETURN(-EINVAL);
 450                 }
 451         }
 452
 453         if ((index < lmv->tgts_size) && (lmv->tgts[index] != NULL)) {
 454                 tgt = lmv->tgts[index];
 455                 CERROR("%s: UUID %s already assigned at LOV target index %d:"
 456                        " rc = %d\n", obd->obd_name,
 457                        obd_uuid2str(&tgt->ltd_uuid), index, -EEXIST);
 458                 mutex_unlock(&lmv->lmv_init_mutex);
 459                 RETURN(-EEXIST);
 460         }
 461
 462         if (index >= lmv->tgts_size) {
 463                 /* We need to reallocate the lmv target array. */
 464                 struct lmv_tgt_desc **newtgts, **old = NULL;
 465                 __u32 newsize = 1;
 466                 __u32 oldsize = 0;
 467
 468                 while (newsize < index + 1)
 469                         newsize = newsize << 1;
 470                 OBD_ALLOC(newtgts, sizeof(*newtgts) * newsize);
 471                 if (newtgts == NULL) {
 472                         mutex_unlock(&lmv->lmv_init_mutex);
 473                         RETURN(-ENOMEM);
 474                 }
 475
 476                 if (lmv->tgts_size) {
 477                         memcpy(newtgts, lmv->tgts,
 478                                sizeof(*newtgts) * lmv->tgts_size);
 479                         old = lmv->tgts;
 480                         oldsize = lmv->tgts_size;
 481                 }
 482
 483                 lmv->tgts = newtgts;
 484                 lmv->tgts_size = newsize;
 485                 smp_rmb();
 486                 if (old)
 487                         OBD_FREE(old, sizeof(*old) * oldsize);
 488
 489                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n", lmv->tgts,
 490                        lmv->tgts_size);
 491         }
 492
 493         OBD_ALLOC_PTR(tgt);
 494         if (!tgt) {
 495                 mutex_unlock(&lmv->lmv_init_mutex);
 496                 RETURN(-ENOMEM);
 497         }
 498
 499         mutex_init(&tgt->ltd_fid_mutex);
 500         tgt->ltd_idx = index;
 501         tgt->ltd_uuid = *uuidp;
 502         tgt->ltd_active = 0;
 503         lmv->tgts[index] = tgt;
 504         if (index >= lmv->desc.ld_tgt_count) {
 505                 orig_tgt_count = lmv->desc.ld_tgt_count;
 506                 lmv->desc.ld_tgt_count = index + 1;
 507         }
 508
 509         if (lmv->connected) {
 510                 rc = lmv_connect_mdc(obd, tgt);
 511                 if (rc != 0) {
 512                         spin_lock(&lmv->lmv_lock);
 513                         if (lmv->desc.ld_tgt_count == index + 1)
 514                                 lmv->desc.ld_tgt_count = orig_tgt_count;
 515                         memset(tgt, 0, sizeof(*tgt));
 516                         spin_unlock(&lmv->lmv_lock);
 517                 } else {
 518                         int easize = sizeof(struct lmv_stripe_md) +
 519                                 lmv->desc.ld_tgt_count * sizeof(struct lu_fid);
 520                         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0, 0);
 521                 }
 522         }
 523
 524         mutex_unlock(&lmv->lmv_init_mutex);
 525         RETURN(rc);
 526 }
 527
 528 int lmv_check_connect(struct obd_device *obd)
 529 {
 530         struct lmv_obd          *lmv = &obd->u.lmv;
 531         struct lmv_tgt_desc     *tgt;
 532         __u32                    i;
 533         int                      rc;
 534         int                      easize;
 535         ENTRY;
 536
 537         if (lmv->connected)
 538                 RETURN(0);
 539
 540         mutex_lock(&lmv->lmv_init_mutex);
 541         if (lmv->connected) {
 542                 mutex_unlock(&lmv->lmv_init_mutex);
 543                 RETURN(0);
 544         }
 545
 546         if (lmv->desc.ld_tgt_count == 0) {
 547                 mutex_unlock(&lmv->lmv_init_mutex);
 548                 CERROR("%s: no targets configured.\n", obd->obd_name);
 549                 RETURN(-EINVAL);
 550         }
 551
 552         LASSERT(lmv->tgts != NULL);
 553
 554         if (lmv->tgts[0] == NULL) {
 555                 mutex_unlock(&lmv->lmv_init_mutex);
 556                 CERROR("%s: no target configured for index 0.\n",
 557                        obd->obd_name);
 558                 RETURN(-EINVAL);
 559         }
 560
 561         CDEBUG(D_CONFIG, "Time to connect %s to %s\n",
 562                lmv->cluuid.uuid, obd->obd_name);
 563
 564         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 565                 tgt = lmv->tgts[i];
 566                 if (tgt == NULL)
 567                         continue;
 568                 rc = lmv_connect_mdc(obd, tgt);
 569                 if (rc)
 570                         GOTO(out_disc, rc);
 571         }
 572
 573         class_export_put(lmv->exp);
 574         lmv->connected = 1;
 575         easize = lmv_mds_md_size(lmv->desc.ld_tgt_count, LMV_MAGIC);
 576         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0, 0);
 577         mutex_unlock(&lmv->lmv_init_mutex);
 578         RETURN(0);
 579
 580  out_disc:
 581         while (i-- > 0) {
 582                 int rc2;
 583                 tgt = lmv->tgts[i];
 584                 if (tgt == NULL)
 585                         continue;
 586                 tgt->ltd_active = 0;
 587                 if (tgt->ltd_exp) {
 588                         --lmv->desc.ld_active_tgt_count;
 589                         rc2 = obd_disconnect(tgt->ltd_exp);
 590                         if (rc2) {
 591                                 CERROR("LMV target %s disconnect on "
 592                                        "MDC idx %d: error %d\n",
 593                                        tgt->ltd_uuid.uuid, i, rc2);
 594                         }
 595                 }
 596         }
 597         class_disconnect(lmv->exp);
 598         mutex_unlock(&lmv->lmv_init_mutex);
 599         RETURN(rc);
 600 }
 601
 602 static int lmv_disconnect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 603 {
 604         struct lmv_obd         *lmv = &obd->u.lmv;
 605         struct obd_device      *mdc_obd;
 606         int                     rc;
 607         ENTRY;
 608
 609         LASSERT(tgt != NULL);
 610         LASSERT(obd != NULL);
 611
 612         mdc_obd = class_exp2obd(tgt->ltd_exp);
 613
 614         if (mdc_obd) {
 615                 mdc_obd->obd_force = obd->obd_force;
 616                 mdc_obd->obd_fail = obd->obd_fail;
 617                 mdc_obd->obd_no_recov = obd->obd_no_recov;
 618         }
 619
 620         if (lmv->targets_proc_entry != NULL)
 621                 lprocfs_remove_proc_entry(mdc_obd->obd_name,
 622                                           lmv->targets_proc_entry);
 623
 624         rc = obd_fid_fini(tgt->ltd_exp->exp_obd);
 625         if (rc)
 626                 CERROR("Can't finanize fids factory\n");
 627
 628         CDEBUG(D_INFO, "Disconnected from %s(%s) successfully\n",
 629                tgt->ltd_exp->exp_obd->obd_name,
 630                tgt->ltd_exp->exp_obd->obd_uuid.uuid);
 631
 632         obd_register_observer(tgt->ltd_exp->exp_obd, NULL);
 633         rc = obd_disconnect(tgt->ltd_exp);
 634         if (rc) {
 635                 if (tgt->ltd_active) {
 636                         CERROR("Target %s disconnect error %d\n",
 637                                tgt->ltd_uuid.uuid, rc);
 638                 }
 639         }
 640
 641         lmv_activate_target(lmv, tgt, 0);
 642         tgt->ltd_exp = NULL;
 643         RETURN(0);
 644 }
 645
 646 static int lmv_disconnect(struct obd_export *exp)
 647 {
 648         struct obd_device       *obd = class_exp2obd(exp);
 649         struct lmv_obd          *lmv = &obd->u.lmv;
 650         int                      rc;
 651         __u32                    i;
 652         ENTRY;
 653
 654         if (!lmv->tgts)
 655                 goto out_local;
 656
 657         /*
 658          * Only disconnect the underlying layers on the final disconnect.
 659          */
 660         lmv->refcount--;
 661         if (lmv->refcount != 0)
 662                 goto out_local;
 663
 664         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 665                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
 666                         continue;
 667
 668                 lmv_disconnect_mdc(obd, lmv->tgts[i]);
 669         }
 670
 671         if (lmv->targets_proc_entry != NULL)
 672                 lprocfs_remove(&lmv->targets_proc_entry);
 673         else
 674                 CERROR("/proc/fs/lustre/%s/%s/target_obds missing\n",
 675                        obd->obd_type->typ_name, obd->obd_name);
 676
 677 out_local:
 678         /*
 679          * This is the case when no real connection is established by
 680          * lmv_check_connect().
 681          */
 682         if (!lmv->connected)
 683                 class_export_put(exp);
 684         rc = class_disconnect(exp);
 685         if (lmv->refcount == 0)
 686                 lmv->connected = 0;
 687         RETURN(rc);
 688 }
 689
 690 static int lmv_fid2path(struct obd_export *exp, int len, void *karg, void *uarg)
 691 {
 692         struct obd_device       *obddev = class_exp2obd(exp);
 693         struct lmv_obd          *lmv = &obddev->u.lmv;
 694         struct getinfo_fid2path *gf;
 695         struct lmv_tgt_desc     *tgt;
 696         struct getinfo_fid2path *remote_gf = NULL;
 697         int                     remote_gf_size = 0;
 698         int                     rc;
 699
 700         gf = (struct getinfo_fid2path *)karg;
 701         tgt = lmv_find_target(lmv, &gf->gf_fid);
 702         if (IS_ERR(tgt))
 703                 RETURN(PTR_ERR(tgt));
 704
 705 repeat_fid2path:
 706         rc = obd_iocontrol(OBD_IOC_FID2PATH, tgt->ltd_exp, len, gf, uarg);
 707         if (rc != 0 && rc != -EREMOTE)
 708                 GOTO(out_fid2path, rc);
 709
 710         /* If remote_gf != NULL, it means just building the
 711          * path on the remote MDT, copy this path segement to gf */
 712         if (remote_gf != NULL) {
 713                 struct getinfo_fid2path *ori_gf;
 714                 char *ptr;
 715
 716                 ori_gf = (struct getinfo_fid2path *)karg;
 717                 if (strlen(ori_gf->gf_path) +
 718                     strlen(gf->gf_path) > ori_gf->gf_pathlen)
 719                         GOTO(out_fid2path, rc = -EOVERFLOW);
 720
 721                 ptr = ori_gf->gf_path;
 722
 723                 memmove(ptr + strlen(gf->gf_path) + 1, ptr,
 724                         strlen(ori_gf->gf_path));
 725
 726                 strncpy(ptr, gf->gf_path, strlen(gf->gf_path));
 727                 ptr += strlen(gf->gf_path);
 728                 *ptr = '/';
 729         }
 730
 731         CDEBUG(D_INFO, "%s: get path %s "DFID" rec: "LPU64" ln: %u\n",
 732                tgt->ltd_exp->exp_obd->obd_name,
 733                gf->gf_path, PFID(&gf->gf_fid), gf->gf_recno,
 734                gf->gf_linkno);
 735
 736         if (rc == 0)
 737                 GOTO(out_fid2path, rc);
 738
 739         /* sigh, has to go to another MDT to do path building further */
 740         if (remote_gf == NULL) {
 741                 remote_gf_size = sizeof(*remote_gf) + PATH_MAX;
 742                 OBD_ALLOC(remote_gf, remote_gf_size);
 743                 if (remote_gf == NULL)
 744                         GOTO(out_fid2path, rc = -ENOMEM);
 745                 remote_gf->gf_pathlen = PATH_MAX;
 746         }
 747
 748         if (!fid_is_sane(&gf->gf_fid)) {
 749                 CERROR("%s: invalid FID "DFID": rc = %d\n",
 750                        tgt->ltd_exp->exp_obd->obd_name,
 751                        PFID(&gf->gf_fid), -EINVAL);
 752                 GOTO(out_fid2path, rc = -EINVAL);
 753         }
 754
 755         tgt = lmv_find_target(lmv, &gf->gf_fid);
 756         if (IS_ERR(tgt))
 757                 GOTO(out_fid2path, rc = -EINVAL);
 758
 759         remote_gf->gf_fid = gf->gf_fid;
 760         remote_gf->gf_recno = -1;
 761         remote_gf->gf_linkno = -1;
 762         memset(remote_gf->gf_path, 0, remote_gf->gf_pathlen);
 763         gf = remote_gf;
 764         goto repeat_fid2path;
 765
 766 out_fid2path:
 767         if (remote_gf != NULL)
 768                 OBD_FREE(remote_gf, remote_gf_size);
 769         RETURN(rc);
 770 }
 771
 772 static int lmv_hsm_req_count(struct lmv_obd *lmv,
 773                              const struct hsm_user_request *hur,
 774                              const struct lmv_tgt_desc *tgt_mds)
 775 {
 776         __u32                    i;
 777         int                      nr = 0;
 778         struct lmv_tgt_desc     *curr_tgt;
 779
 780         /* count how many requests must be sent to the given target */
 781         for (i = 0; i < hur->hur_request.hr_itemcount; i++) {
 782                 curr_tgt = lmv_find_target(lmv, &hur->hur_user_item[i].hui_fid);
 783                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid))
 784                         nr++;
 785         }
 786         return nr;
 787 }
 788
 789 static void lmv_hsm_req_build(struct lmv_obd *lmv,
 790                               struct hsm_user_request *hur_in,
 791                               const struct lmv_tgt_desc *tgt_mds,
 792                               struct hsm_user_request *hur_out)
 793 {
 794         __u32                    i, nr_out;
 795         struct lmv_tgt_desc     *curr_tgt;
 796
 797         /* build the hsm_user_request for the given target */
 798         hur_out->hur_request = hur_in->hur_request;
 799         nr_out = 0;
 800         for (i = 0; i < hur_in->hur_request.hr_itemcount; i++) {
 801                 curr_tgt = lmv_find_target(lmv,
 802                                            &hur_in->hur_user_item[i].hui_fid);
 803                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid)) {
 804                         hur_out->hur_user_item[nr_out] =
 805                                                 hur_in->hur_user_item[i];
 806                         nr_out++;
 807                 }
 808         }
 809         hur_out->hur_request.hr_itemcount = nr_out;
 810         memcpy(hur_data(hur_out), hur_data(hur_in),
 811                hur_in->hur_request.hr_data_len);
 812 }
 813
 814 static int lmv_hsm_ct_unregister(struct lmv_obd *lmv, unsigned int cmd, int len,
 815                                  struct lustre_kernelcomm *lk, void *uarg)
 816 {
 817         __u32                    i;
 818         int                      rc;
 819         struct kkuc_ct_data     *kcd = NULL;
 820         ENTRY;
 821
 822         /* unregister request (call from llapi_hsm_copytool_fini) */
 823         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 824                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 825
 826                 if (tgt == NULL || tgt->ltd_exp == NULL)
 827                         continue;
 828                 /* best effort: try to clean as much as possible
 829                  * (continue on error) */
 830                 obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
 831         }
 832
 833         /* Whatever the result, remove copytool from kuc groups.
 834          * Unreached coordinators will get EPIPE on next requests
 835          * and will unregister automatically.
 836          */
 837         rc = libcfs_kkuc_group_rem(lk->lk_uid, lk->lk_group, (void **)&kcd);
 838         if (kcd != NULL)
 839                 OBD_FREE_PTR(kcd);
 840
 841         RETURN(rc);
 842 }
 843
 844 static int lmv_hsm_ct_register(struct lmv_obd *lmv, unsigned int cmd, int len,
 845                                struct lustre_kernelcomm *lk, void *uarg)
 846 {
 847         struct file             *filp;
 848         __u32                    i, j;
 849         int                      err, rc;
 850         bool                     any_set = false;
 851         struct kkuc_ct_data     *kcd;
 852         ENTRY;
 853
 854         /* All or nothing: try to register to all MDS.
 855          * In case of failure, unregister from previous MDS,
 856          * except if it because of inactive target. */
 857         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 858                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 859
 860                 if (tgt == NULL || tgt->ltd_exp == NULL)
 861                         continue;
 862                 err = obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
 863                 if (err) {
 864                         if (tgt->ltd_active) {
 865                                 /* permanent error */
 866                                 CERROR("%s: iocontrol MDC %s on MDT"
 867                                        " idx %d cmd %x: err = %d\n",
 868                                        class_exp2obd(lmv->exp)->obd_name,
 869                                        tgt->ltd_uuid.uuid, i, cmd, err);
 870                                 rc = err;
 871                                 lk->lk_flags |= LK_FLG_STOP;
 872                                 /* unregister from previous MDS */
 873                                 for (j = 0; j < i; j++) {
 874                                         tgt = lmv->tgts[j];
 875                                         if (tgt == NULL || tgt->ltd_exp == NULL)
 876                                                 continue;
 877                                         obd_iocontrol(cmd, tgt->ltd_exp, len,
 878                                                       lk, uarg);
 879                                 }
 880                                 RETURN(rc);
 881                         }
 882                         /* else: transient error.
 883                          * kuc will register to the missing MDT
 884                          * when it is back */
 885                 } else {
 886                         any_set = true;
 887                 }
 888         }
 889
 890         if (!any_set)
 891                 /* no registration done: return error */
 892                 RETURN(-ENOTCONN);
 893
 894         /* at least one registration done, with no failure */
 895         filp = fget(lk->lk_wfd);
 896         if (filp == NULL)
 897                 RETURN(-EBADF);
 898
 899         OBD_ALLOC_PTR(kcd);
 900         if (kcd == NULL) {
 901                 fput(filp);
 902                 RETURN(-ENOMEM);
 903         }
 904         kcd->kcd_magic = KKUC_CT_DATA_MAGIC;
 905         kcd->kcd_uuid = lmv->cluuid;
 906         kcd->kcd_archive = lk->lk_data;
 907
 908         rc = libcfs_kkuc_group_add(filp, lk->lk_uid, lk->lk_group, kcd);
 909         if (rc != 0) {
 910                 if (filp != NULL)
 911                         fput(filp);
 912                 OBD_FREE_PTR(kcd);
 913         }
 914
 915         RETURN(rc);
 916 }
 917
 918
 919
 920
 921 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
 922                          int len, void *karg, void *uarg)
 923 {
 924         struct obd_device       *obddev = class_exp2obd(exp);
 925         struct lmv_obd          *lmv = &obddev->u.lmv;
 926         struct lmv_tgt_desc     *tgt = NULL;
 927         __u32                    i = 0;
 928         int                      rc = 0;
 929         int                      set = 0;
 930         __u32                    count = lmv->desc.ld_tgt_count;
 931         ENTRY;
 932
 933         if (count == 0)
 934                 RETURN(-ENOTTY);
 935
 936         switch (cmd) {
 937         case IOC_OBD_STATFS: {
 938                 struct obd_ioctl_data *data = karg;
 939                 struct obd_device *mdc_obd;
 940                 struct obd_statfs stat_buf = {0};
 941                 __u32 index;
 942
 943                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
 944                 if ((index >= count))
 945                         RETURN(-ENODEV);
 946
 947                 tgt = lmv->tgts[index];
 948                 if (tgt == NULL || !tgt->ltd_active)
 949                         RETURN(-ENODATA);
 950
 951                 mdc_obd = class_exp2obd(tgt->ltd_exp);
 952                 if (!mdc_obd)
 953                         RETURN(-EINVAL);
 954
 955                 /* copy UUID */
 956                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(mdc_obd),
 957                                  min((int) data->ioc_plen2,
 958                                      (int) sizeof(struct obd_uuid))))
 959                         RETURN(-EFAULT);
 960
 961                 rc = obd_statfs(NULL, tgt->ltd_exp, &stat_buf,
 962                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 963                                 0);
 964                 if (rc)
 965                         RETURN(rc);
 966                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
 967                                  min((int) data->ioc_plen1,
 968                                      (int) sizeof(stat_buf))))
 969                         RETURN(-EFAULT);
 970                 break;
 971         }
 972         case OBD_IOC_QUOTACTL: {
 973                 struct if_quotactl *qctl = karg;
 974                 struct obd_quotactl *oqctl;
 975
 976                 if (qctl->qc_valid == QC_MDTIDX) {
 977                         if (count <= qctl->qc_idx)
 978                                 RETURN(-EINVAL);
 979
 980                         tgt = lmv->tgts[qctl->qc_idx];
 981                         if (tgt == NULL || tgt->ltd_exp == NULL)
 982                                 RETURN(-EINVAL);
 983                 } else if (qctl->qc_valid == QC_UUID) {
 984                         for (i = 0; i < count; i++) {
 985                                 tgt = lmv->tgts[i];
 986                                 if (tgt == NULL)
 987                                         continue;
 988                                 if (!obd_uuid_equals(&tgt->ltd_uuid,
 989                                                      &qctl->obd_uuid))
 990                                         continue;
 991
 992                                 if (tgt->ltd_exp == NULL)
 993                                         RETURN(-EINVAL);
 994
 995                                 break;
 996                         }
 997                 } else {
 998                         RETURN(-EINVAL);
 999                 }
1000
1001                 if (i >= count)
1002                         RETURN(-EAGAIN);
1003
1004                 LASSERT(tgt != NULL && tgt->ltd_exp != NULL);
1005                 OBD_ALLOC_PTR(oqctl);
1006                 if (!oqctl)
1007                         RETURN(-ENOMEM);
1008
1009                 QCTL_COPY(oqctl, qctl);
1010                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
1011                 if (rc == 0) {
1012                         QCTL_COPY(qctl, oqctl);
1013                         qctl->qc_valid = QC_MDTIDX;
1014                         qctl->obd_uuid = tgt->ltd_uuid;
1015                 }
1016                 OBD_FREE_PTR(oqctl);
1017                 break;
1018         }
1019         case OBD_IOC_CHANGELOG_SEND:
1020         case OBD_IOC_CHANGELOG_CLEAR: {
1021                 struct ioc_changelog *icc = karg;
1022
1023                 if (icc->icc_mdtindex >= count)
1024                         RETURN(-ENODEV);
1025
1026                 tgt = lmv->tgts[icc->icc_mdtindex];
1027                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
1028                         RETURN(-ENODEV);
1029                 rc = obd_iocontrol(cmd, tgt->ltd_exp, sizeof(*icc), icc, NULL);
1030                 break;
1031         }
1032         case LL_IOC_GET_CONNECT_FLAGS: {
1033                 tgt = lmv->tgts[0];
1034                 if (tgt == NULL || tgt->ltd_exp == NULL)
1035                         RETURN(-ENODATA);
1036                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1037                 break;
1038         }
1039         case LL_IOC_FID2MDTIDX: {
1040                 struct lu_fid *fid = karg;
1041                 int             mdt_index;
1042
1043                 rc = lmv_fld_lookup(lmv, fid, &mdt_index);
1044                 if (rc != 0)
1045                         RETURN(rc);
1046
1047                 /* Note: this is from llite(see ll_dir_ioctl()), @uarg does not
1048                  * point to user space memory for FID2MDTIDX. */
1049                 *(__u32 *)uarg = mdt_index;
1050                 break;
1051         }
1052         case OBD_IOC_FID2PATH: {
1053                 rc = lmv_fid2path(exp, len, karg, uarg);
1054                 break;
1055         }
1056         case LL_IOC_HSM_STATE_GET:
1057         case LL_IOC_HSM_STATE_SET:
1058         case LL_IOC_HSM_ACTION: {
1059                 struct md_op_data       *op_data = karg;
1060
1061                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
1062                 if (IS_ERR(tgt))
1063                         RETURN(PTR_ERR(tgt));
1064
1065                 if (tgt->ltd_exp == NULL)
1066                         RETURN(-EINVAL);
1067
1068                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1069                 break;
1070         }
1071         case LL_IOC_HSM_PROGRESS: {
1072                 const struct hsm_progress_kernel *hpk = karg;
1073
1074                 tgt = lmv_find_target(lmv, &hpk->hpk_fid);
1075                 if (IS_ERR(tgt))
1076                         RETURN(PTR_ERR(tgt));
1077                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1078                 break;
1079         }
1080         case LL_IOC_HSM_REQUEST: {
1081                 struct hsm_user_request *hur = karg;
1082                 unsigned int reqcount = hur->hur_request.hr_itemcount;
1083
1084                 if (reqcount == 0)
1085                         RETURN(0);
1086
1087                 /* if the request is about a single fid
1088                  * or if there is a single MDS, no need to split
1089                  * the request. */
1090                 if (reqcount == 1 || count == 1) {
1091                         tgt = lmv_find_target(lmv,
1092                                               &hur->hur_user_item[0].hui_fid);
1093                         if (IS_ERR(tgt))
1094                                 RETURN(PTR_ERR(tgt));
1095                         rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1096                 } else {
1097                         /* split fid list to their respective MDS */
1098                         for (i = 0; i < count; i++) {
1099                                 unsigned int            nr, reqlen;
1100                                 int                     rc1;
1101                                 struct hsm_user_request *req;
1102
1103                                 tgt = lmv->tgts[i];
1104                                 if (tgt == NULL || tgt->ltd_exp == NULL)
1105                                         continue;
1106
1107                                 nr = lmv_hsm_req_count(lmv, hur, tgt);
1108                                 if (nr == 0) /* nothing for this MDS */
1109                                         continue;
1110
1111                                 /* build a request with fids for this MDS */
1112                                 reqlen = offsetof(typeof(*hur),
1113                                                   hur_user_item[nr])
1114                                                 + hur->hur_request.hr_data_len;
1115                                 OBD_ALLOC_LARGE(req, reqlen);
1116                                 if (req == NULL)
1117                                         RETURN(-ENOMEM);
1118
1119                                 lmv_hsm_req_build(lmv, hur, tgt, req);
1120
1121                                 rc1 = obd_iocontrol(cmd, tgt->ltd_exp, reqlen,
1122                                                     req, uarg);
1123                                 if (rc1 != 0 && rc == 0)
1124                                         rc = rc1;
1125                                 OBD_FREE_LARGE(req, reqlen);
1126                         }
1127                 }
1128                 break;
1129         }
1130         case LL_IOC_LOV_SWAP_LAYOUTS: {
1131                 struct md_op_data       *op_data = karg;
1132                 struct lmv_tgt_desc     *tgt1, *tgt2;
1133
1134                 tgt1 = lmv_find_target(lmv, &op_data->op_fid1);
1135                 if (IS_ERR(tgt1))
1136                         RETURN(PTR_ERR(tgt1));
1137
1138                 tgt2 = lmv_find_target(lmv, &op_data->op_fid2);
1139                 if (IS_ERR(tgt2))
1140                         RETURN(PTR_ERR(tgt2));
1141
1142                 if ((tgt1->ltd_exp == NULL) || (tgt2->ltd_exp == NULL))
1143                         RETURN(-EINVAL);
1144
1145                 /* only files on same MDT can have their layouts swapped */
1146                 if (tgt1->ltd_idx != tgt2->ltd_idx)
1147                         RETURN(-EPERM);
1148
1149                 rc = obd_iocontrol(cmd, tgt1->ltd_exp, len, karg, uarg);
1150                 break;
1151         }
1152         case LL_IOC_HSM_CT_START: {
1153                 struct lustre_kernelcomm *lk = karg;
1154                 if (lk->lk_flags & LK_FLG_STOP)
1155                         rc = lmv_hsm_ct_unregister(lmv, cmd, len, lk, uarg);
1156                 else
1157                         rc = lmv_hsm_ct_register(lmv, cmd, len, lk, uarg);
1158                 break;
1159         }
1160         default:
1161                 for (i = 0; i < count; i++) {
1162                         struct obd_device *mdc_obd;
1163                         int err;
1164
1165                         tgt = lmv->tgts[i];
1166                         if (tgt == NULL || tgt->ltd_exp == NULL)
1167                                 continue;
1168                         /* ll_umount_begin() sets force flag but for lmv, not
1169                          * mdc. Let's pass it through */
1170                         mdc_obd = class_exp2obd(tgt->ltd_exp);
1171                         mdc_obd->obd_force = obddev->obd_force;
1172                         err = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1173                         if (err == -ENODATA && cmd == OBD_IOC_POLL_QUOTACHECK) {
1174                                 RETURN(err);
1175                         } else if (err) {
1176                                 if (tgt->ltd_active) {
1177                                         CERROR("error: iocontrol MDC %s on MDT"
1178                                                " idx %d cmd %x: err = %d\n",
1179                                                tgt->ltd_uuid.uuid, i, cmd, err);
1180                                         if (!rc)
1181                                                 rc = err;
1182                                 }
1183                         } else
1184                                 set = 1;
1185                 }
1186                 if (!set && !rc)
1187                         rc = -EIO;
1188         }
1189         RETURN(rc);
1190 }
1191
1192 #if 0
1193 static int lmv_all_chars_policy(int count, const char *name,
1194                                 int len)
1195 {
1196         unsigned int c = 0;
1197
1198         while (len > 0)
1199                 c += name[--len];
1200         c = c % count;
1201         return c;
1202 }
1203
1204 static int lmv_nid_policy(struct lmv_obd *lmv)
1205 {
1206         struct obd_import *imp;
1207         __u32              id;
1208
1209         /*
1210          * XXX: To get nid we assume that underlying obd device is mdc.
1211          */
1212         imp = class_exp2cliimp(lmv->tgts[0].ltd_exp);
1213         id = imp->imp_connection->c_self ^ (imp->imp_connection->c_self >> 32);
1214         return id % lmv->desc.ld_tgt_count;
1215 }
1216
1217 static int lmv_choose_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
1218                           placement_policy_t placement)
1219 {
1220         switch (placement) {
1221         case PLACEMENT_CHAR_POLICY:
1222                 return lmv_all_chars_policy(lmv->desc.ld_tgt_count,
1223                                             op_data->op_name,
1224                                             op_data->op_namelen);
1225         case PLACEMENT_NID_POLICY:
1226                 return lmv_nid_policy(lmv);
1227
1228         default:
1229                 break;
1230         }
1231
1232         CERROR("Unsupported placement policy %x\n", placement);
1233         return -EINVAL;
1234 }
1235 #endif
1236
1237 /**
1238  * This is _inode_ placement policy function (not name).
1239  */
1240 static int lmv_placement_policy(struct obd_device *obd,
1241                                 struct md_op_data *op_data, u32 *mds)
1242 {
1243         struct lmv_obd          *lmv = &obd->u.lmv;
1244         ENTRY;
1245
1246         LASSERT(mds != NULL);
1247
1248         if (lmv->desc.ld_tgt_count == 1) {
1249                 *mds = 0;
1250                 RETURN(0);
1251         }
1252
1253         if (op_data->op_default_stripe_offset != -1) {
1254                 *mds = op_data->op_default_stripe_offset;
1255                 RETURN(0);
1256         }
1257
1258         /**
1259          * If stripe_offset is provided during setdirstripe
1260          * (setdirstripe -i xx), xx MDS will be choosen.
1261          */
1262         if (op_data->op_cli_flags & CLI_SET_MEA && op_data->op_data != NULL) {
1263                 struct lmv_user_md *lum;
1264
1265                 lum = op_data->op_data;
1266
1267                 if (le32_to_cpu(lum->lum_stripe_offset) != (__u32)-1) {
1268                         *mds = le32_to_cpu(lum->lum_stripe_offset);
1269                 } else {
1270                         /* -1 means default, which will be in the same MDT with
1271                          * the stripe */
1272                         *mds = op_data->op_mds;
1273                         lum->lum_stripe_offset = cpu_to_le32(op_data->op_mds);
1274                 }
1275         } else {
1276                 /* Allocate new fid on target according to operation type and
1277                  * parent home mds. */
1278                 *mds = op_data->op_mds;
1279         }
1280
1281         RETURN(0);
1282 }
1283
1284 int __lmv_fid_alloc(struct lmv_obd *lmv, struct lu_fid *fid, u32 mds)
1285 {
1286         struct lmv_tgt_desc     *tgt;
1287         int                      rc;
1288         ENTRY;
1289
1290         tgt = lmv_get_target(lmv, mds, NULL);
1291         if (IS_ERR(tgt))
1292                 RETURN(PTR_ERR(tgt));
1293
1294         /*
1295          * New seq alloc and FLD setup should be atomic. Otherwise we may find
1296          * on server that seq in new allocated fid is not yet known.
1297          */
1298         mutex_lock(&tgt->ltd_fid_mutex);
1299
1300         if (tgt->ltd_active == 0 || tgt->ltd_exp == NULL)
1301                 GOTO(out, rc = -ENODEV);
1302
1303         /*
1304          * Asking underlying tgt layer to allocate new fid.
1305          */
1306         rc = obd_fid_alloc(NULL, tgt->ltd_exp, fid, NULL);
1307         if (rc > 0) {
1308                 LASSERT(fid_is_sane(fid));
1309                 rc = 0;
1310         }
1311
1312         EXIT;
1313 out:
1314         mutex_unlock(&tgt->ltd_fid_mutex);
1315         return rc;
1316 }
1317
1318 int lmv_fid_alloc(const struct lu_env *env, struct obd_export *exp,
1319                   struct lu_fid *fid, struct md_op_data *op_data)
1320 {
1321         struct obd_device     *obd = class_exp2obd(exp);
1322         struct lmv_obd        *lmv = &obd->u.lmv;
1323         u32                    mds = 0;
1324         int                    rc;
1325         ENTRY;
1326
1327         LASSERT(op_data != NULL);
1328         LASSERT(fid != NULL);
1329
1330         rc = lmv_placement_policy(obd, op_data, &mds);
1331         if (rc) {
1332                 CERROR("Can't get target for allocating fid, "
1333                        "rc %d\n", rc);
1334                 RETURN(rc);
1335         }
1336
1337         rc = __lmv_fid_alloc(lmv, fid, mds);
1338         if (rc) {
1339                 CERROR("Can't alloc new fid, rc %d\n", rc);
1340                 RETURN(rc);
1341         }
1342
1343         RETURN(rc);
1344 }
1345
1346 static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
1347 {
1348         struct lmv_obd  *lmv = &obd->u.lmv;
1349         struct lmv_desc *desc;
1350         int             rc;
1351         ENTRY;
1352
1353         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1354                 CERROR("LMV setup requires a descriptor\n");
1355                 RETURN(-EINVAL);
1356         }
1357
1358         desc = (struct lmv_desc *)lustre_cfg_buf(lcfg, 1);
1359         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1360                 CERROR("Lmv descriptor size wrong: %d > %d\n",
1361                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1362                 RETURN(-EINVAL);
1363         }
1364
1365         lmv->tgts_size = 32U;
1366         OBD_ALLOC(lmv->tgts, sizeof(*lmv->tgts) * lmv->tgts_size);
1367         if (lmv->tgts == NULL)
1368                 RETURN(-ENOMEM);
1369
1370         obd_str2uuid(&lmv->desc.ld_uuid, desc->ld_uuid.uuid);
1371         lmv->desc.ld_tgt_count = 0;
1372         lmv->desc.ld_active_tgt_count = 0;
1373         lmv->max_cookiesize = 0;
1374         lmv->max_def_easize = 0;
1375         lmv->max_easize = 0;
1376         lmv->lmv_placement = PLACEMENT_CHAR_POLICY;
1377
1378         spin_lock_init(&lmv->lmv_lock);
1379         mutex_init(&lmv->lmv_init_mutex);
1380
1381 #ifdef CONFIG_PROC_FS
1382         obd->obd_vars = lprocfs_lmv_obd_vars;
1383         lprocfs_obd_setup(obd);
1384         lprocfs_alloc_md_stats(obd, 0);
1385         rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
1386                                 0444, &lmv_proc_target_fops, obd);
1387         if (rc)
1388                 CWARN("%s: error adding LMV target_obd file: rc = %d\n",
1389                       obd->obd_name, rc);
1390 #endif
1391         rc = fld_client_init(&lmv->lmv_fld, obd->obd_name,
1392                              LUSTRE_CLI_FLD_HASH_DHT);
1393         if (rc) {
1394                 CERROR("Can't init FLD, err %d\n", rc);
1395                 GOTO(out, rc);
1396         }
1397
1398         RETURN(0);
1399
1400 out:
1401         return rc;
1402 }
1403
1404 static int lmv_cleanup(struct obd_device *obd)
1405 {
1406         struct lmv_obd   *lmv = &obd->u.lmv;
1407         ENTRY;
1408
1409         fld_client_fini(&lmv->lmv_fld);
1410         if (lmv->tgts != NULL) {
1411                 int i;
1412                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1413                         if (lmv->tgts[i] == NULL)
1414                                 continue;
1415                         lmv_del_target(lmv, i);
1416                 }
1417                 OBD_FREE(lmv->tgts, sizeof(*lmv->tgts) * lmv->tgts_size);
1418                 lmv->tgts_size = 0;
1419         }
1420         RETURN(0);
1421 }
1422
1423 static int lmv_process_config(struct obd_device *obd, size_t len, void *buf)
1424 {
1425         struct lustre_cfg       *lcfg = buf;
1426         struct obd_uuid         obd_uuid;
1427         int                     gen;
1428         __u32                   index;
1429         int                     rc;
1430         ENTRY;
1431
1432         switch (lcfg->lcfg_command) {
1433         case LCFG_ADD_MDC:
1434                 /* modify_mdc_tgts add 0:lustre-clilmv  1:lustre-MDT0000_UUID
1435                  * 2:0  3:1  4:lustre-MDT0000-mdc_UUID */
1436                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
1437                         GOTO(out, rc = -EINVAL);
1438
1439                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
1440
1441                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%u", &index) != 1)
1442                         GOTO(out, rc = -EINVAL);
1443                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", &gen) != 1)
1444                         GOTO(out, rc = -EINVAL);
1445                 rc = lmv_add_target(obd, &obd_uuid, index, gen);
1446                 GOTO(out, rc);
1447         default:
1448                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1449                 GOTO(out, rc = -EINVAL);
1450         }
1451 out:
1452         RETURN(rc);
1453 }
1454
1455 static int lmv_statfs(const struct lu_env *env, struct obd_export *exp,
1456                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
1457 {
1458         struct obd_device       *obd = class_exp2obd(exp);
1459         struct lmv_obd          *lmv = &obd->u.lmv;
1460         struct obd_statfs       *temp;
1461         int                      rc = 0;
1462         __u32                    i;
1463         ENTRY;
1464
1465         rc = lmv_check_connect(obd);
1466         if (rc)
1467                 RETURN(rc);
1468
1469         OBD_ALLOC(temp, sizeof(*temp));
1470         if (temp == NULL)
1471                 RETURN(-ENOMEM);
1472
1473         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1474                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1475                         continue;
1476
1477                 rc = obd_statfs(env, lmv->tgts[i]->ltd_exp, temp,
1478                                 max_age, flags);
1479                 if (rc) {
1480                         CERROR("can't stat MDS #%d (%s), error %d\n", i,
1481                                lmv->tgts[i]->ltd_exp->exp_obd->obd_name,
1482                                rc);
1483                         GOTO(out_free_temp, rc);
1484                 }
1485
1486                 if (i == 0) {
1487                         *osfs = *temp;
1488                         /* If the statfs is from mount, it will needs
1489                          * retrieve necessary information from MDT0.
1490                          * i.e. mount does not need the merged osfs
1491                          * from all of MDT.
1492                          * And also clients can be mounted as long as
1493                          * MDT0 is in service*/
1494                         if (flags & OBD_STATFS_FOR_MDT0)
1495                                 GOTO(out_free_temp, rc);
1496                 } else {
1497                         osfs->os_bavail += temp->os_bavail;
1498                         osfs->os_blocks += temp->os_blocks;
1499                         osfs->os_ffree += temp->os_ffree;
1500                         osfs->os_files += temp->os_files;
1501                 }
1502         }
1503
1504         EXIT;
1505 out_free_temp:
1506         OBD_FREE(temp, sizeof(*temp));
1507         return rc;
1508 }
1509
1510 static int lmv_getstatus(struct obd_export *exp,
1511                          struct lu_fid *fid,
1512                          struct obd_capa **pc)
1513 {
1514         struct obd_device    *obd = exp->exp_obd;
1515         struct lmv_obd       *lmv = &obd->u.lmv;
1516         int                   rc;
1517         ENTRY;
1518
1519         rc = lmv_check_connect(obd);
1520         if (rc)
1521                 RETURN(rc);
1522
1523         rc = md_getstatus(lmv->tgts[0]->ltd_exp, fid, pc);
1524         RETURN(rc);
1525 }
1526
1527 static int lmv_getxattr(struct obd_export *exp, const struct lu_fid *fid,
1528                         struct obd_capa *oc, u64 valid, const char *name,
1529                         const char *input, int input_size, int output_size,
1530                         int flags, struct ptlrpc_request **request)
1531 {
1532         struct obd_device      *obd = exp->exp_obd;
1533         struct lmv_obd         *lmv = &obd->u.lmv;
1534         struct lmv_tgt_desc    *tgt;
1535         int                     rc;
1536         ENTRY;
1537
1538         rc = lmv_check_connect(obd);
1539         if (rc)
1540                 RETURN(rc);
1541
1542         tgt = lmv_find_target(lmv, fid);
1543         if (IS_ERR(tgt))
1544                 RETURN(PTR_ERR(tgt));
1545
1546         rc = md_getxattr(tgt->ltd_exp, fid, oc, valid, name, input,
1547                          input_size, output_size, flags, request);
1548
1549         RETURN(rc);
1550 }
1551
1552 static int lmv_setxattr(struct obd_export *exp, const struct lu_fid *fid,
1553                         struct obd_capa *oc, u64 valid, const char *name,
1554                         const char *input, int input_size, int output_size,
1555                         int flags, __u32 suppgid,
1556                         struct ptlrpc_request **request)
1557 {
1558         struct obd_device      *obd = exp->exp_obd;
1559         struct lmv_obd         *lmv = &obd->u.lmv;
1560         struct lmv_tgt_desc    *tgt;
1561         int                     rc;
1562         ENTRY;
1563
1564         rc = lmv_check_connect(obd);
1565         if (rc)
1566                 RETURN(rc);
1567
1568         tgt = lmv_find_target(lmv, fid);
1569         if (IS_ERR(tgt))
1570                 RETURN(PTR_ERR(tgt));
1571
1572         rc = md_setxattr(tgt->ltd_exp, fid, oc, valid, name, input,
1573                          input_size, output_size, flags, suppgid,
1574                          request);
1575
1576         RETURN(rc);
1577 }
1578
1579 static int lmv_getattr(struct obd_export *exp, struct md_op_data *op_data,
1580                        struct ptlrpc_request **request)
1581 {
1582         struct obd_device       *obd = exp->exp_obd;
1583         struct lmv_obd          *lmv = &obd->u.lmv;
1584         struct lmv_tgt_desc     *tgt;
1585         int                      rc;
1586         ENTRY;
1587
1588         rc = lmv_check_connect(obd);
1589         if (rc)
1590                 RETURN(rc);
1591
1592         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1593         if (IS_ERR(tgt))
1594                 RETURN(PTR_ERR(tgt));
1595
1596         if (op_data->op_flags & MF_GET_MDT_IDX) {
1597                 op_data->op_mds = tgt->ltd_idx;
1598                 RETURN(0);
1599         }
1600
1601         rc = md_getattr(tgt->ltd_exp, op_data, request);
1602
1603         RETURN(rc);
1604 }
1605
1606 static int lmv_null_inode(struct obd_export *exp, const struct lu_fid *fid)
1607 {
1608         struct obd_device   *obd = exp->exp_obd;
1609         struct lmv_obd      *lmv = &obd->u.lmv;
1610         __u32                i;
1611         int                  rc;
1612         ENTRY;
1613
1614         rc = lmv_check_connect(obd);
1615         if (rc)
1616                 RETURN(rc);
1617
1618         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1619
1620         /*
1621          * With DNE every object can have two locks in different namespaces:
1622          * lookup lock in space of MDT storing direntry and update/open lock in
1623          * space of MDT storing inode.
1624          */
1625         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1626                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1627                         continue;
1628                 md_null_inode(lmv->tgts[i]->ltd_exp, fid);
1629         }
1630
1631         RETURN(0);
1632 }
1633
1634 static int lmv_find_cbdata(struct obd_export *exp, const struct lu_fid *fid,
1635                            ldlm_iterator_t it, void *data)
1636 {
1637         struct obd_device       *obd = exp->exp_obd;
1638         struct lmv_obd          *lmv = &obd->u.lmv;
1639         int                     i;
1640         int                     tgt;
1641         int                     rc;
1642         ENTRY;
1643
1644         rc = lmv_check_connect(obd);
1645         if (rc)
1646                 RETURN(rc);
1647
1648         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1649
1650         /*
1651          * With DNE every object can have two locks in different namespaces:
1652          * lookup lock in space of MDT storing direntry and update/open lock in
1653          * space of MDT storing inode.  Try the MDT that the FID maps to first,
1654          * since this can be easily found, and only try others if that fails.
1655          */
1656         for (i = 0, tgt = lmv_find_target_index(lmv, fid);
1657              i < lmv->desc.ld_tgt_count;
1658              i++, tgt = (tgt + 1) % lmv->desc.ld_tgt_count) {
1659                 if (tgt < 0) {
1660                         CDEBUG(D_HA, "%s: "DFID" is inaccessible: rc = %d\n",
1661                                obd->obd_name, PFID(fid), tgt);
1662                         tgt = 0;
1663                 }
1664
1665                 if (lmv->tgts[tgt] == NULL ||
1666                     lmv->tgts[tgt]->ltd_exp == NULL)
1667                         continue;
1668
1669                 rc = md_find_cbdata(lmv->tgts[tgt]->ltd_exp, fid, it, data);
1670                 if (rc)
1671                         RETURN(rc);
1672         }
1673
1674         RETURN(rc);
1675 }
1676
1677
1678 static int lmv_close(struct obd_export *exp, struct md_op_data *op_data,
1679                      struct md_open_data *mod, struct ptlrpc_request **request)
1680 {
1681         struct obd_device     *obd = exp->exp_obd;
1682         struct lmv_obd        *lmv = &obd->u.lmv;
1683         struct lmv_tgt_desc   *tgt;
1684         int                    rc;
1685         ENTRY;
1686
1687         rc = lmv_check_connect(obd);
1688         if (rc)
1689                 RETURN(rc);
1690
1691         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1692         if (IS_ERR(tgt))
1693                 RETURN(PTR_ERR(tgt));
1694
1695         CDEBUG(D_INODE, "CLOSE "DFID"\n", PFID(&op_data->op_fid1));
1696         rc = md_close(tgt->ltd_exp, op_data, mod, request);
1697         RETURN(rc);
1698 }
1699
1700 /**
1701  * Choosing the MDT by name or FID in @op_data.
1702  * For non-striped directory, it will locate MDT by fid.
1703  * For striped-directory, it will locate MDT by name. And also
1704  * it will reset op_fid1 with the FID of the choosen stripe.
1705  **/
1706 struct lmv_tgt_desc *
1707 lmv_locate_target_for_name(struct lmv_obd *lmv, struct lmv_stripe_md *lsm,
1708                            const char *name, int namelen, struct lu_fid *fid,
1709                            u32 *mds)
1710 {
1711         struct lmv_tgt_desc     *tgt;
1712         const struct lmv_oinfo  *oinfo;
1713
1714         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_NAME_HASH)) {
1715                 oinfo = &lsm->lsm_md_oinfo[cfs_fail_val];
1716         } else {
1717                 oinfo = lsm_name_to_stripe_info(lsm, name, namelen);
1718                 if (IS_ERR(oinfo))
1719                         RETURN(ERR_CAST(oinfo));
1720         }
1721
1722         *fid = oinfo->lmo_fid;
1723         *mds = oinfo->lmo_mds;
1724         tgt = lmv_get_target(lmv, *mds, NULL);
1725
1726         CDEBUG(D_INFO, "locate on mds %u "DFID"\n", *mds, PFID(fid));
1727         return tgt;
1728 }
1729
1730 /**
1731  * Locate mds by fid or name
1732  *
1733  * For striped directory (lsm != NULL), it will locate the stripe
1734  * by name hash (see lsm_name_to_stripe_info()). Note: if the hash_type
1735  * is unknown, it will return -EBADFD, and lmv_intent_lookup might need
1736  * walk through all of stripes to locate the entry.
1737  *
1738  * For normal direcotry, it will locate MDS by FID directly.
1739  * \param[in] lmv       LMV device
1740  * \param[in] op_data   client MD stack parameters, name, namelen
1741  *                      mds_num etc.
1742  * \param[in] fid       object FID used to locate MDS.
1743  *
1744  * retval               pointer to the lmv_tgt_desc if succeed.
1745  *                      ERR_PTR(errno) if failed.
1746  */
1747 struct lmv_tgt_desc*
1748 lmv_locate_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
1749                struct lu_fid *fid)
1750 {
1751         struct lmv_stripe_md    *lsm = op_data->op_mea1;
1752         struct lmv_tgt_desc     *tgt;
1753
1754         /* During creating VOLATILE file, it should honor the mdt
1755          * index if the file under striped dir is being restored, see
1756          * ct_restore(). */
1757         if (op_data->op_bias & MDS_CREATE_VOLATILE &&
1758             (int)op_data->op_mds != -1 && lsm != NULL) {
1759                 int i;
1760                 tgt = lmv_get_target(lmv, op_data->op_mds, NULL);
1761                 if (IS_ERR(tgt))
1762                         return tgt;
1763
1764                 /* refill the right parent fid */
1765                 for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
1766                         struct lmv_oinfo *oinfo;
1767
1768                         oinfo = &lsm->lsm_md_oinfo[i];
1769                         if (oinfo->lmo_mds == op_data->op_mds) {
1770                                 *fid = oinfo->lmo_fid;
1771                                 break;
1772                         }
1773                 }
1774
1775                 /* Hmm, can not find the stripe by mdt_index(op_mds) */
1776                 if (i == lsm->lsm_md_stripe_count)
1777                         tgt = ERR_PTR(-EINVAL);
1778
1779                 return tgt;
1780         }
1781
1782         if (lsm == NULL || op_data->op_namelen == 0) {
1783                 tgt = lmv_find_target(lmv, fid);
1784                 if (IS_ERR(tgt))
1785                         return tgt;
1786
1787                 op_data->op_mds = tgt->ltd_idx;
1788                 return tgt;
1789         }
1790
1791         return lmv_locate_target_for_name(lmv, lsm, op_data->op_name,
1792                                           op_data->op_namelen, fid,
1793                                           &op_data->op_mds);
1794 }
1795
1796 int lmv_create(struct obd_export *exp, struct md_op_data *op_data,
1797                 const void *data, size_t datalen, umode_t mode, uid_t uid,
1798                 gid_t gid, cfs_cap_t cap_effective, __u64 rdev,
1799                 struct ptlrpc_request **request)
1800 {
1801         struct obd_device       *obd = exp->exp_obd;
1802         struct lmv_obd          *lmv = &obd->u.lmv;
1803         struct lmv_tgt_desc     *tgt;
1804         int                      rc;
1805         ENTRY;
1806
1807         rc = lmv_check_connect(obd);
1808         if (rc)
1809                 RETURN(rc);
1810
1811         if (!lmv->desc.ld_active_tgt_count)
1812                 RETURN(-EIO);
1813
1814         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1815         if (IS_ERR(tgt))
1816                 RETURN(PTR_ERR(tgt));
1817
1818         CDEBUG(D_INODE, "CREATE name '%.*s' on "DFID" -> mds #%x\n",
1819                 (int)op_data->op_namelen, op_data->op_name,
1820                 PFID(&op_data->op_fid1), op_data->op_mds);
1821
1822         rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
1823         if (rc)
1824                 RETURN(rc);
1825         if (exp_connect_flags(exp) & OBD_CONNECT_DIR_STRIPE) {
1826                 /* Send the create request to the MDT where the object
1827                  * will be located */
1828                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
1829                 if (IS_ERR(tgt))
1830                         RETURN(PTR_ERR(tgt));
1831
1832                 op_data->op_mds = tgt->ltd_idx;
1833         } else {
1834                 CDEBUG(D_CONFIG, "Server doesn't support striped dirs\n");
1835         }
1836
1837         CDEBUG(D_INODE, "CREATE obj "DFID" -> mds #%x\n",
1838                PFID(&op_data->op_fid2), op_data->op_mds);
1839
1840         op_data->op_flags |= MF_MDC_CANCEL_FID1;
1841         rc = md_create(tgt->ltd_exp, op_data, data, datalen, mode, uid, gid,
1842                        cap_effective, rdev, request);
1843         if (rc == 0) {
1844                 if (*request == NULL)
1845                         RETURN(rc);
1846                 CDEBUG(D_INODE, "Created - "DFID"\n", PFID(&op_data->op_fid2));
1847         }
1848         RETURN(rc);
1849 }
1850
1851 static int lmv_done_writing(struct obd_export *exp,
1852                             struct md_op_data *op_data,
1853                             struct md_open_data *mod)
1854 {
1855         struct obd_device     *obd = exp->exp_obd;
1856         struct lmv_obd        *lmv = &obd->u.lmv;
1857         struct lmv_tgt_desc   *tgt;
1858         int                    rc;
1859         ENTRY;
1860
1861         rc = lmv_check_connect(obd);
1862         if (rc)
1863                 RETURN(rc);
1864
1865         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1866         if (IS_ERR(tgt))
1867                 RETURN(PTR_ERR(tgt));
1868
1869         rc = md_done_writing(tgt->ltd_exp, op_data, mod);
1870         RETURN(rc);
1871 }
1872
1873 static int
1874 lmv_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1875             const union ldlm_policy_data *policy,
1876             struct lookup_intent *it, struct md_op_data *op_data,
1877             struct lustre_handle *lockh, __u64 extra_lock_flags)
1878 {
1879         struct obd_device        *obd = exp->exp_obd;
1880         struct lmv_obd           *lmv = &obd->u.lmv;
1881         struct lmv_tgt_desc      *tgt;
1882         int                       rc;
1883         ENTRY;
1884
1885         rc = lmv_check_connect(obd);
1886         if (rc)
1887                 RETURN(rc);
1888
1889         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID"\n",
1890                LL_IT2STR(it), PFID(&op_data->op_fid1));
1891
1892         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1893         if (IS_ERR(tgt))
1894                 RETURN(PTR_ERR(tgt));
1895
1896         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID" -> mds #%u\n",
1897                LL_IT2STR(it), PFID(&op_data->op_fid1), tgt->ltd_idx);
1898
1899         rc = md_enqueue(tgt->ltd_exp, einfo, policy, it, op_data, lockh,
1900                         extra_lock_flags);
1901
1902         RETURN(rc);
1903 }
1904
1905 static int
1906 lmv_getattr_name(struct obd_export *exp,struct md_op_data *op_data,
1907                  struct ptlrpc_request **preq)
1908 {
1909         struct ptlrpc_request   *req = NULL;
1910         struct obd_device       *obd = exp->exp_obd;
1911         struct lmv_obd          *lmv = &obd->u.lmv;
1912         struct lmv_tgt_desc     *tgt;
1913         struct mdt_body         *body;
1914         int                      rc;
1915         ENTRY;
1916
1917         rc = lmv_check_connect(obd);
1918         if (rc)
1919                 RETURN(rc);
1920
1921         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1922         if (IS_ERR(tgt))
1923                 RETURN(PTR_ERR(tgt));
1924
1925         CDEBUG(D_INODE, "GETATTR_NAME for %*s on "DFID" -> mds #%d\n",
1926                 (int)op_data->op_namelen, op_data->op_name,
1927                 PFID(&op_data->op_fid1), tgt->ltd_idx);
1928
1929         rc = md_getattr_name(tgt->ltd_exp, op_data, preq);
1930         if (rc != 0)
1931                 RETURN(rc);
1932
1933         body = req_capsule_server_get(&(*preq)->rq_pill, &RMF_MDT_BODY);
1934         LASSERT(body != NULL);
1935
1936         if (body->mbo_valid & OBD_MD_MDS) {
1937                 struct lu_fid rid = body->mbo_fid1;
1938                 CDEBUG(D_INODE, "Request attrs for "DFID"\n",
1939                        PFID(&rid));
1940
1941                 tgt = lmv_find_target(lmv, &rid);
1942                 if (IS_ERR(tgt)) {
1943                         ptlrpc_req_finished(*preq);
1944                         preq = NULL;
1945                         RETURN(PTR_ERR(tgt));
1946                 }
1947
1948                 op_data->op_fid1 = rid;
1949                 op_data->op_valid |= OBD_MD_FLCROSSREF;
1950                 op_data->op_namelen = 0;
1951                 op_data->op_name = NULL;
1952                 rc = md_getattr_name(tgt->ltd_exp, op_data, &req);
1953                 ptlrpc_req_finished(*preq);
1954                 *preq = req;
1955         }
1956
1957         RETURN(rc);
1958 }
1959
1960 #define md_op_data_fid(op_data, fl)                     \
1961         (fl == MF_MDC_CANCEL_FID1 ? &op_data->op_fid1 : \
1962          fl == MF_MDC_CANCEL_FID2 ? &op_data->op_fid2 : \
1963          fl == MF_MDC_CANCEL_FID3 ? &op_data->op_fid3 : \
1964          fl == MF_MDC_CANCEL_FID4 ? &op_data->op_fid4 : \
1965          NULL)
1966
1967 static int lmv_early_cancel(struct obd_export *exp, struct lmv_tgt_desc *tgt,
1968                             struct md_op_data *op_data,
1969                             __u32 op_tgt, ldlm_mode_t mode, int bits, int flag)
1970 {
1971         struct lu_fid          *fid = md_op_data_fid(op_data, flag);
1972         struct obd_device      *obd = exp->exp_obd;
1973         struct lmv_obd         *lmv = &obd->u.lmv;
1974         ldlm_policy_data_t      policy = {{ 0 }};
1975         int                     rc = 0;
1976         ENTRY;
1977
1978         if (!fid_is_sane(fid))
1979                 RETURN(0);
1980
1981         if (tgt == NULL) {
1982                 tgt = lmv_find_target(lmv, fid);
1983                 if (IS_ERR(tgt))
1984                         RETURN(PTR_ERR(tgt));
1985         }
1986
1987         if (tgt->ltd_idx != op_tgt) {
1988                 CDEBUG(D_INODE, "EARLY_CANCEL on "DFID"\n", PFID(fid));
1989                 policy.l_inodebits.bits = bits;
1990                 rc = md_cancel_unused(tgt->ltd_exp, fid, &policy,
1991                                       mode, LCF_ASYNC, NULL);
1992         } else {
1993                 CDEBUG(D_INODE,
1994                        "EARLY_CANCEL skip operation target %d on "DFID"\n",
1995                        op_tgt, PFID(fid));
1996                 op_data->op_flags |= flag;
1997                 rc = 0;
1998         }
1999
2000         RETURN(rc);
2001 }
2002
2003 /*
2004  * llite passes fid of an target inode in op_data->op_fid1 and id of directory in
2005  * op_data->op_fid2
2006  */
2007 static int lmv_link(struct obd_export *exp, struct md_op_data *op_data,
2008                     struct ptlrpc_request **request)
2009 {
2010         struct obd_device       *obd = exp->exp_obd;
2011         struct lmv_obd          *lmv = &obd->u.lmv;
2012         struct lmv_tgt_desc     *tgt;
2013         int                      rc;
2014         ENTRY;
2015
2016         rc = lmv_check_connect(obd);
2017         if (rc)
2018                 RETURN(rc);
2019
2020         LASSERT(op_data->op_namelen != 0);
2021
2022         CDEBUG(D_INODE, "LINK "DFID":%*s to "DFID"\n",
2023                PFID(&op_data->op_fid2), (int)op_data->op_namelen,
2024                op_data->op_name, PFID(&op_data->op_fid1));
2025
2026         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2027         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2028         op_data->op_cap = cfs_curproc_cap_pack();
2029         if (op_data->op_mea2 != NULL) {
2030                 struct lmv_stripe_md    *lsm = op_data->op_mea2;
2031                 const struct lmv_oinfo  *oinfo;
2032
2033                 oinfo = lsm_name_to_stripe_info(lsm, op_data->op_name,
2034                                                 op_data->op_namelen);
2035                 if (IS_ERR(oinfo))
2036                         RETURN(PTR_ERR(oinfo));
2037
2038                 op_data->op_fid2 = oinfo->lmo_fid;
2039         }
2040
2041         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid2);
2042         if (IS_ERR(tgt))
2043                 RETURN(PTR_ERR(tgt));
2044
2045         /*
2046          * Cancel UPDATE lock on child (fid1).
2047          */
2048         op_data->op_flags |= MF_MDC_CANCEL_FID2;
2049         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_idx, LCK_EX,
2050                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2051         if (rc != 0)
2052                 RETURN(rc);
2053
2054         rc = md_link(tgt->ltd_exp, op_data, request);
2055
2056         RETURN(rc);
2057 }
2058
2059 static int lmv_rename(struct obd_export *exp, struct md_op_data *op_data,
2060                       const char *old, size_t oldlen,
2061                       const char *new, size_t newlen,
2062                       struct ptlrpc_request **request)
2063 {
2064         struct obd_device       *obd = exp->exp_obd;
2065         struct lmv_obd          *lmv = &obd->u.lmv;
2066         struct lmv_tgt_desc     *src_tgt;
2067         int                     rc;
2068         ENTRY;
2069
2070         LASSERT(oldlen != 0);
2071
2072         CDEBUG(D_INODE, "RENAME %.*s in "DFID":%d to %.*s in "DFID":%d\n",
2073                (int)oldlen, old, PFID(&op_data->op_fid1),
2074                op_data->op_mea1 ? op_data->op_mea1->lsm_md_stripe_count : 0,
2075                (int)newlen, new, PFID(&op_data->op_fid2),
2076                op_data->op_mea2 ? op_data->op_mea2->lsm_md_stripe_count : 0);
2077
2078         rc = lmv_check_connect(obd);
2079         if (rc)
2080                 RETURN(rc);
2081
2082         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2083         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2084         op_data->op_cap = cfs_curproc_cap_pack();
2085         if (op_data->op_cli_flags & CLI_MIGRATE) {
2086                 LASSERTF(fid_is_sane(&op_data->op_fid3), "invalid FID "DFID"\n",
2087                          PFID(&op_data->op_fid3));
2088                 rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
2089                 if (rc)
2090                         RETURN(rc);
2091                 src_tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid3);
2092         } else {
2093                 if (op_data->op_mea1 != NULL) {
2094                         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2095
2096                         src_tgt = lmv_locate_target_for_name(lmv, lsm, old,
2097                                                              oldlen,
2098                                                              &op_data->op_fid1,
2099                                                              &op_data->op_mds);
2100                         if (IS_ERR(src_tgt))
2101                                 RETURN(PTR_ERR(src_tgt));
2102                 } else {
2103                         src_tgt = lmv_find_target(lmv, &op_data->op_fid1);
2104                         if (IS_ERR(src_tgt))
2105                                 RETURN(PTR_ERR(src_tgt));
2106
2107                         op_data->op_mds = src_tgt->ltd_idx;
2108                 }
2109
2110                 if (op_data->op_mea2) {
2111                         struct lmv_stripe_md    *lsm = op_data->op_mea2;
2112                         const struct lmv_oinfo  *oinfo;
2113
2114                         oinfo = lsm_name_to_stripe_info(lsm, new, newlen);
2115                         if (IS_ERR(oinfo))
2116                                 RETURN(PTR_ERR(oinfo));
2117
2118                         op_data->op_fid2 = oinfo->lmo_fid;
2119                 }
2120         }
2121         if (IS_ERR(src_tgt))
2122                 RETURN(PTR_ERR(src_tgt));
2123
2124         /*
2125          * LOOKUP lock on src child (fid3) should also be cancelled for
2126          * src_tgt in mdc_rename.
2127          */
2128         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2129
2130         /*
2131          * Cancel UPDATE locks on tgt parent (fid2), tgt_tgt is its
2132          * own target.
2133          */
2134         rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2135                               LCK_EX, MDS_INODELOCK_UPDATE,
2136                               MF_MDC_CANCEL_FID2);
2137
2138         if (rc != 0)
2139                 RETURN(rc);
2140         /*
2141          * Cancel LOOKUP locks on source child (fid3) for parent tgt_tgt.
2142          */
2143         if (fid_is_sane(&op_data->op_fid3)) {
2144                 struct lmv_tgt_desc *tgt;
2145
2146                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
2147                 if (IS_ERR(tgt))
2148                         RETURN(PTR_ERR(tgt));
2149
2150                 /* Cancel LOOKUP lock on its parent */
2151                 rc = lmv_early_cancel(exp, tgt, op_data, src_tgt->ltd_idx,
2152                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2153                                       MF_MDC_CANCEL_FID3);
2154                 if (rc != 0)
2155                         RETURN(rc);
2156
2157                 rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2158                                       LCK_EX, MDS_INODELOCK_FULL,
2159                                       MF_MDC_CANCEL_FID3);
2160                 if (rc != 0)
2161                         RETURN(rc);
2162         }
2163
2164         /*
2165          * Cancel all the locks on tgt child (fid4).
2166          */
2167         if (fid_is_sane(&op_data->op_fid4))
2168                 rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2169                                       LCK_EX, MDS_INODELOCK_FULL,
2170                                       MF_MDC_CANCEL_FID4);
2171
2172         CDEBUG(D_INODE, DFID":m%d to "DFID"\n", PFID(&op_data->op_fid1),
2173                op_data->op_mds, PFID(&op_data->op_fid2));
2174
2175         rc = md_rename(src_tgt->ltd_exp, op_data, old, oldlen, new, newlen,
2176                        request);
2177
2178         RETURN(rc);
2179 }
2180
2181 static int lmv_setattr(struct obd_export *exp, struct md_op_data *op_data,
2182                         void *ea, size_t ealen, void *ea2, size_t ea2len,
2183                         struct ptlrpc_request **request,
2184                         struct md_open_data **mod)
2185 {
2186         struct obd_device       *obd = exp->exp_obd;
2187         struct lmv_obd          *lmv = &obd->u.lmv;
2188         struct lmv_tgt_desc     *tgt;
2189         int                      rc = 0;
2190         ENTRY;
2191
2192         rc = lmv_check_connect(obd);
2193         if (rc)
2194                 RETURN(rc);
2195
2196         CDEBUG(D_INODE, "SETATTR for "DFID", valid 0x%x\n",
2197                PFID(&op_data->op_fid1), op_data->op_attr.ia_valid);
2198
2199         op_data->op_flags |= MF_MDC_CANCEL_FID1;
2200         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2201         if (IS_ERR(tgt))
2202                 RETURN(PTR_ERR(tgt));
2203
2204         rc = md_setattr(tgt->ltd_exp, op_data, ea, ealen, ea2,
2205                         ea2len, request, mod);
2206
2207         RETURN(rc);
2208 }
2209
2210 static int lmv_fsync(struct obd_export *exp, const struct lu_fid *fid,
2211                      struct obd_capa *oc, struct ptlrpc_request **request)
2212 {
2213         struct obd_device       *obd = exp->exp_obd;
2214         struct lmv_obd          *lmv = &obd->u.lmv;
2215         struct lmv_tgt_desc     *tgt;
2216         int                      rc;
2217         ENTRY;
2218
2219         rc = lmv_check_connect(obd);
2220         if (rc != 0)
2221                 RETURN(rc);
2222
2223         tgt = lmv_find_target(lmv, fid);
2224         if (IS_ERR(tgt))
2225                 RETURN(PTR_ERR(tgt));
2226
2227         rc = md_fsync(tgt->ltd_exp, fid, oc, request);
2228         RETURN(rc);
2229 }
2230
2231 /**
2232  * Get current minimum entry from striped directory
2233  *
2234  * This function will search the dir entry, whose hash value is the
2235  * closest(>=) to @hash_offset, from all of sub-stripes, and it is
2236  * only being called for striped directory.
2237  *
2238  * \param[in] exp               export of LMV
2239  * \param[in] op_data           parameters transferred beween client MD stack
2240  *                              stripe_information will be included in this
2241  *                              parameter
2242  * \param[in] cb_op             ldlm callback being used in enqueue in
2243  *                              mdc_read_page
2244  * \param[in] hash_offset       the hash value, which is used to locate
2245  *                              minum(closet) dir entry
2246  * \param[in|out] stripe_offset the caller use this to indicate the stripe
2247  *                              index of last entry, so to avoid hash conflict
2248  *                              between stripes. It will also be used to
2249  *                              return the stripe index of current dir entry.
2250  * \param[in|out] entp          the minum entry and it also is being used
2251  *                              to input the last dir entry to resolve the
2252  *                              hash conflict
2253  *
2254  * \param[out] ppage            the page which holds the minum entry
2255  *
2256  * \retval                      = 0 get the entry successfully
2257  *                              negative errno (< 0) does not get the entry
2258  */
2259 static int lmv_get_min_striped_entry(struct obd_export *exp,
2260                                      struct md_op_data *op_data,
2261                                      struct md_callback *cb_op,
2262                                      __u64 hash_offset, int *stripe_offset,
2263                                      struct lu_dirent **entp,
2264                                      struct page **ppage)
2265 {
2266         struct obd_device       *obd = exp->exp_obd;
2267         struct lmv_obd          *lmv = &obd->u.lmv;
2268         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2269         struct lmv_tgt_desc     *tgt;
2270         int                     stripe_count;
2271         struct lu_dirent        *min_ent = NULL;
2272         struct page             *min_page = NULL;
2273         int                     min_idx = 0;
2274         int                     i;
2275         int                     rc = 0;
2276         ENTRY;
2277
2278         stripe_count = lsm->lsm_md_stripe_count;
2279         for (i = 0; i < stripe_count; i++) {
2280                 struct lu_dirent        *ent = NULL;
2281                 struct page             *page = NULL;
2282                 struct lu_dirpage       *dp;
2283                 __u64                   stripe_hash = hash_offset;
2284
2285                 tgt = lmv_get_target(lmv, lsm->lsm_md_oinfo[i].lmo_mds, NULL);
2286                 if (IS_ERR(tgt))
2287                         GOTO(out, rc = PTR_ERR(tgt));
2288
2289                 /* op_data will be shared by each stripe, so we need
2290                  * reset these value for each stripe */
2291                 op_data->op_fid1 = lsm->lsm_md_oinfo[i].lmo_fid;
2292                 op_data->op_fid2 = lsm->lsm_md_oinfo[i].lmo_fid;
2293                 op_data->op_data = lsm->lsm_md_oinfo[i].lmo_root;
2294 next:
2295                 rc = md_read_page(tgt->ltd_exp, op_data, cb_op, stripe_hash,
2296                                   &page);
2297                 if (rc != 0)
2298                         GOTO(out, rc);
2299
2300                 dp = page_address(page);
2301                 for (ent = lu_dirent_start(dp); ent != NULL;
2302                      ent = lu_dirent_next(ent)) {
2303                         /* Skip dummy entry */
2304                         if (le16_to_cpu(ent->lde_namelen) == 0)
2305                                 continue;
2306
2307                         if (le64_to_cpu(ent->lde_hash) < hash_offset)
2308                                 continue;
2309
2310                         if (le64_to_cpu(ent->lde_hash) == hash_offset &&
2311                             (*entp == ent || i < *stripe_offset))
2312                                 continue;
2313
2314                         /* skip . and .. for other stripes */
2315                         if (i != 0 &&
2316                             (strncmp(ent->lde_name, ".",
2317                                      le16_to_cpu(ent->lde_namelen)) == 0 ||
2318                              strncmp(ent->lde_name, "..",
2319                                      le16_to_cpu(ent->lde_namelen)) == 0))
2320                                 continue;
2321                         break;
2322                 }
2323
2324                 if (ent == NULL) {
2325                         stripe_hash = le64_to_cpu(dp->ldp_hash_end);
2326
2327                         kunmap(page);
2328                         page_cache_release(page);
2329                         page = NULL;
2330
2331                         /* reach the end of current stripe, go to next stripe */
2332                         if (stripe_hash == MDS_DIR_END_OFF)
2333                                 continue;
2334                         else
2335                                 goto next;
2336                 }
2337
2338                 if (min_ent != NULL) {
2339                         if (le64_to_cpu(min_ent->lde_hash) >
2340                             le64_to_cpu(ent->lde_hash)) {
2341                                 min_ent = ent;
2342                                 kunmap(min_page);
2343                                 page_cache_release(min_page);
2344                                 min_idx = i;
2345                                 min_page = page;
2346                         } else {
2347                                 kunmap(page);
2348                                 page_cache_release(page);
2349                                 page = NULL;
2350                         }
2351                 } else {
2352                         min_ent = ent;
2353                         min_page = page;
2354                         min_idx = i;
2355                 }
2356         }
2357
2358 out:
2359         if (*ppage != NULL) {
2360                 kunmap(*ppage);
2361                 page_cache_release(*ppage);
2362         }
2363         *stripe_offset = min_idx;
2364         *entp = min_ent;
2365         *ppage = min_page;
2366         RETURN(rc);
2367 }
2368
2369 /**
2370  * Build dir entry page from a striped directory
2371  *
2372  * This function gets one entry by @offset from a striped directory. It will
2373  * read entries from all of stripes, and choose one closest to the required
2374  * offset(&offset). A few notes
2375  * 1. skip . and .. for non-zero stripes, because there can only have one .
2376  * and .. in a directory.
2377  * 2. op_data will be shared by all of stripes, instead of allocating new
2378  * one, so need to restore before reusing.
2379  * 3. release the entry page if that is not being chosen.
2380  *
2381  * \param[in] exp       obd export refer to LMV
2382  * \param[in] op_data   hold those MD parameters of read_entry
2383  * \param[in] cb_op     ldlm callback being used in enqueue in mdc_read_entry
2384  * \param[out] ldp      the entry being read
2385  * \param[out] ppage    the page holding the entry. Note: because the entry
2386  *                      will be accessed in upper layer, so we need hold the
2387  *                      page until the usages of entry is finished, see
2388  *                      ll_dir_entry_next.
2389  *
2390  * retval               =0 if get entry successfully
2391  *                      <0 cannot get entry
2392  */
2393 static int lmv_read_striped_page(struct obd_export *exp,
2394                                  struct md_op_data *op_data,
2395                                  struct md_callback *cb_op,
2396                                  __u64 offset, struct page **ppage)
2397 {
2398         struct obd_device       *obd = exp->exp_obd;
2399         struct lu_fid           master_fid = op_data->op_fid1;
2400         struct inode            *master_inode = op_data->op_data;
2401         __u64                   hash_offset = offset;
2402         struct lu_dirpage       *dp;
2403         struct page             *min_ent_page = NULL;
2404         struct page             *ent_page = NULL;
2405         struct lu_dirent        *ent;
2406         void                    *area;
2407         int                     ent_idx = 0;
2408         struct lu_dirent        *min_ent = NULL;
2409         struct lu_dirent        *last_ent;
2410         size_t                  left_bytes;
2411         int                     rc;
2412         ENTRY;
2413
2414         rc = lmv_check_connect(obd);
2415         if (rc)
2416                 RETURN(rc);
2417
2418         /* Allocate a page and read entries from all of stripes and fill
2419          * the page by hash order */
2420         ent_page = alloc_page(GFP_KERNEL);
2421         if (ent_page == NULL)
2422                 RETURN(-ENOMEM);
2423
2424         /* Initialize the entry page */
2425         dp = kmap(ent_page);
2426         memset(dp, 0, sizeof(*dp));
2427         dp->ldp_hash_start = cpu_to_le64(offset);
2428         dp->ldp_flags |= LDF_COLLIDE;
2429
2430         area = dp + 1;
2431         left_bytes = PAGE_CACHE_SIZE - sizeof(*dp);
2432         ent = area;
2433         last_ent = ent;
2434         do {
2435                 __u16   ent_size;
2436
2437                 /* Find the minum entry from all sub-stripes */
2438                 rc = lmv_get_min_striped_entry(exp, op_data, cb_op, hash_offset,
2439                                                &ent_idx, &min_ent,
2440                                                &min_ent_page);
2441                 if (rc != 0)
2442                         GOTO(out, rc);
2443
2444                 /* If it can not get minum entry, it means it already reaches
2445                  * the end of this directory */
2446                 if (min_ent == NULL) {
2447                         last_ent->lde_reclen = 0;
2448                         hash_offset = MDS_DIR_END_OFF;
2449                         GOTO(out, rc);
2450                 }
2451
2452                 ent_size = le16_to_cpu(min_ent->lde_reclen);
2453
2454                 /* the last entry lde_reclen is 0, but it might not
2455                  * the end of this entry of this temporay entry */
2456                 if (ent_size == 0)
2457                         ent_size = lu_dirent_calc_size(
2458                                         le16_to_cpu(min_ent->lde_namelen),
2459                                         le32_to_cpu(min_ent->lde_attrs));
2460                 if (ent_size > left_bytes) {
2461                         last_ent->lde_reclen = cpu_to_le16(0);
2462                         hash_offset = le64_to_cpu(min_ent->lde_hash);
2463                         GOTO(out, rc);
2464                 }
2465
2466                 memcpy(ent, min_ent, ent_size);
2467
2468                 /* Replace . with master FID and Replace .. with the parent FID
2469                  * of master object */
2470                 if (strncmp(ent->lde_name, ".",
2471                             le16_to_cpu(ent->lde_namelen)) == 0 &&
2472                     le16_to_cpu(ent->lde_namelen) == 1)
2473                         fid_cpu_to_le(&ent->lde_fid, &master_fid);
2474                 else if (strncmp(ent->lde_name, "..",
2475                                    le16_to_cpu(ent->lde_namelen)) == 0 &&
2476                            le16_to_cpu(ent->lde_namelen) == 2)
2477                         fid_cpu_to_le(&ent->lde_fid, &op_data->op_fid3);
2478
2479                 left_bytes -= ent_size;
2480                 ent->lde_reclen = cpu_to_le16(ent_size);
2481                 last_ent = ent;
2482                 ent = (void *)ent + ent_size;
2483                 hash_offset = le64_to_cpu(min_ent->lde_hash);
2484                 if (hash_offset == MDS_DIR_END_OFF) {
2485                         last_ent->lde_reclen = 0;
2486                         break;
2487                 }
2488         } while (1);
2489 out:
2490         if (min_ent_page != NULL) {
2491                 kunmap(min_ent_page);
2492                 page_cache_release(min_ent_page);
2493         }
2494
2495         if (unlikely(rc != 0)) {
2496                 __free_page(ent_page);
2497                 ent_page = NULL;
2498         } else {
2499                 if (ent == area)
2500                         dp->ldp_flags |= LDF_EMPTY;
2501                 dp->ldp_flags = cpu_to_le32(dp->ldp_flags);
2502                 dp->ldp_hash_end = cpu_to_le64(hash_offset);
2503         }
2504
2505         /* We do not want to allocate md_op_data during each
2506          * dir entry reading, so op_data will be shared by every stripe,
2507          * then we need to restore it back to original value before
2508          * return to the upper layer */
2509         op_data->op_fid1 = master_fid;
2510         op_data->op_fid2 = master_fid;
2511         op_data->op_data = master_inode;
2512
2513         *ppage = ent_page;
2514
2515         RETURN(rc);
2516 }
2517
2518 int lmv_read_page(struct obd_export *exp, struct md_op_data *op_data,
2519                   struct md_callback *cb_op, __u64 offset,
2520                   struct page **ppage)
2521 {
2522         struct obd_device       *obd = exp->exp_obd;
2523         struct lmv_obd          *lmv = &obd->u.lmv;
2524         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2525         struct lmv_tgt_desc     *tgt;
2526         int                     rc;
2527         ENTRY;
2528
2529         rc = lmv_check_connect(obd);
2530         if (rc != 0)
2531                 RETURN(rc);
2532
2533         if (unlikely(lsm != NULL)) {
2534                 rc = lmv_read_striped_page(exp, op_data, cb_op, offset, ppage);
2535                 RETURN(rc);
2536         }
2537
2538         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2539         if (IS_ERR(tgt))
2540                 RETURN(PTR_ERR(tgt));
2541
2542         rc = md_read_page(tgt->ltd_exp, op_data, cb_op, offset, ppage);
2543
2544         RETURN(rc);
2545 }
2546
2547 /**
2548  * Unlink a file/directory
2549  *
2550  * Unlink a file or directory under the parent dir. The unlink request
2551  * usually will be sent to the MDT where the child is located, but if
2552  * the client does not have the child FID then request will be sent to the
2553  * MDT where the parent is located.
2554  *
2555  * If the parent is a striped directory then it also needs to locate which
2556  * stripe the name of the child is located, and replace the parent FID
2557  * (@op->op_fid1) with the stripe FID. Note: if the stripe is unknown,
2558  * it will walk through all of sub-stripes until the child is being
2559  * unlinked finally.
2560  *
2561  * \param[in] exp       export refer to LMV
2562  * \param[in] op_data   different parameters transferred beween client
2563  *                      MD stacks, name, namelen, FIDs etc.
2564  *                      op_fid1 is the parent FID, op_fid2 is the child
2565  *                      FID.
2566  * \param[out] request  point to the request of unlink.
2567  *
2568  * retval               0 if succeed
2569  *                      negative errno if failed.
2570  */
2571 static int lmv_unlink(struct obd_export *exp, struct md_op_data *op_data,
2572                       struct ptlrpc_request **request)
2573 {
2574         struct obd_device       *obd = exp->exp_obd;
2575         struct lmv_obd          *lmv = &obd->u.lmv;
2576         struct lmv_tgt_desc     *tgt = NULL;
2577         struct lmv_tgt_desc     *parent_tgt = NULL;
2578         struct mdt_body         *body;
2579         int                     rc;
2580         int                     stripe_index = 0;
2581         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2582         ENTRY;
2583
2584         rc = lmv_check_connect(obd);
2585         if (rc)
2586                 RETURN(rc);
2587 retry_unlink:
2588         /* For striped dir, we need to locate the parent as well */
2589         if (lsm != NULL) {
2590                 struct lmv_tgt_desc *tmp;
2591
2592                 LASSERT(op_data->op_name != NULL &&
2593                         op_data->op_namelen != 0);
2594
2595                 tmp = lmv_locate_target_for_name(lmv, lsm,
2596                                                  op_data->op_name,
2597                                                  op_data->op_namelen,
2598                                                  &op_data->op_fid1,
2599                                                  &op_data->op_mds);
2600
2601                 /* return -EBADFD means unknown hash type, might
2602                  * need try all sub-stripe here */
2603                 if (IS_ERR(tmp) && PTR_ERR(tmp) != -EBADFD)
2604                         RETURN(PTR_ERR(tmp));
2605
2606                 /* Note: both migrating dir and unknown hash dir need to
2607                  * try all of sub-stripes, so we need start search the
2608                  * name from stripe 0, but migrating dir is already handled
2609                  * inside lmv_locate_target_for_name(), so we only check
2610                  * unknown hash type directory here */
2611                 if (!lmv_is_known_hash_type(lsm->lsm_md_hash_type)) {
2612                         struct lmv_oinfo *oinfo;
2613
2614                         oinfo = &lsm->lsm_md_oinfo[stripe_index];
2615
2616                         op_data->op_fid1 = oinfo->lmo_fid;
2617                         op_data->op_mds = oinfo->lmo_mds;
2618                 }
2619         }
2620
2621 try_next_stripe:
2622         /* Send unlink requests to the MDT where the child is located */
2623         if (likely(!fid_is_zero(&op_data->op_fid2)))
2624                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
2625         else if (lsm != NULL)
2626                 tgt = lmv_get_target(lmv, op_data->op_mds, NULL);
2627         else
2628                 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
2629
2630         if (IS_ERR(tgt))
2631                 RETURN(PTR_ERR(tgt));
2632
2633         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2634         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2635         op_data->op_cap = cfs_curproc_cap_pack();
2636
2637         /*
2638          * If child's fid is given, cancel unused locks for it if it is from
2639          * another export than parent.
2640          *
2641          * LOOKUP lock for child (fid3) should also be cancelled on parent
2642          * tgt_tgt in mdc_unlink().
2643          */
2644         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2645
2646         /*
2647          * Cancel FULL locks on child (fid3).
2648          */
2649         parent_tgt = lmv_find_target(lmv, &op_data->op_fid1);
2650         if (IS_ERR(parent_tgt))
2651                 RETURN(PTR_ERR(parent_tgt));
2652
2653         if (parent_tgt != tgt) {
2654                 rc = lmv_early_cancel(exp, parent_tgt, op_data, tgt->ltd_idx,
2655                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2656                                       MF_MDC_CANCEL_FID3);
2657         }
2658
2659         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_idx, LCK_EX,
2660                               MDS_INODELOCK_FULL, MF_MDC_CANCEL_FID3);
2661         if (rc != 0)
2662                 RETURN(rc);
2663
2664         CDEBUG(D_INODE, "unlink with fid="DFID"/"DFID" -> mds #%u\n",
2665                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2), tgt->ltd_idx);
2666
2667         rc = md_unlink(tgt->ltd_exp, op_data, request);
2668         if (rc != 0 && rc != -EREMOTE && rc != -ENOENT)
2669                 RETURN(rc);
2670
2671         /* Try next stripe if it is needed. */
2672         if (rc == -ENOENT && lsm != NULL && lmv_need_try_all_stripes(lsm)) {
2673                 struct lmv_oinfo *oinfo;
2674
2675                 stripe_index++;
2676                 if (stripe_index >= lsm->lsm_md_stripe_count)
2677                         RETURN(rc);
2678
2679                 oinfo = &lsm->lsm_md_oinfo[stripe_index];
2680
2681                 op_data->op_fid1 = oinfo->lmo_fid;
2682                 op_data->op_mds = oinfo->lmo_mds;
2683
2684                 ptlrpc_req_finished(*request);
2685                 *request = NULL;
2686
2687                 goto try_next_stripe;
2688         }
2689
2690         body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
2691         if (body == NULL)
2692                 RETURN(-EPROTO);
2693
2694         /* Not cross-ref case, just get out of here. */
2695         if (likely(!(body->mbo_valid & OBD_MD_MDS)))
2696                 RETURN(rc);
2697
2698         CDEBUG(D_INODE, "%s: try unlink to another MDT for "DFID"\n",
2699                exp->exp_obd->obd_name, PFID(&body->mbo_fid1));
2700
2701         /* This is a remote object, try remote MDT, Note: it may
2702          * try more than 1 time here, Considering following case
2703          * /mnt/lustre is root on MDT0, remote1 is on MDT1
2704          * 1. Initially A does not know where remote1 is, it send
2705          *    unlink RPC to MDT0, MDT0 return -EREMOTE, it will
2706          *    resend unlink RPC to MDT1 (retry 1st time).
2707          *
2708          * 2. During the unlink RPC in flight,
2709          *    client B mv /mnt/lustre/remote1 /mnt/lustre/remote2
2710          *    and create new remote1, but on MDT0
2711          *
2712          * 3. MDT1 get unlink RPC(from A), then do remote lock on
2713          *    /mnt/lustre, then lookup get fid of remote1, and find
2714          *    it is remote dir again, and replay -EREMOTE again.
2715          *
2716          * 4. Then A will resend unlink RPC to MDT0. (retry 2nd times).
2717          *
2718          * In theory, it might try unlimited time here, but it should
2719          * be very rare case.  */
2720         op_data->op_fid2 = body->mbo_fid1;
2721         ptlrpc_req_finished(*request);
2722         *request = NULL;
2723
2724         goto retry_unlink;
2725 }
2726
2727 static int lmv_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
2728 {
2729         struct lmv_obd *lmv = &obd->u.lmv;
2730         int rc = 0;
2731
2732         switch (stage) {
2733         case OBD_CLEANUP_EARLY:
2734                 /* XXX: here should be calling obd_precleanup() down to
2735                  * stack. */
2736                 break;
2737         case OBD_CLEANUP_EXPORTS:
2738                 fld_client_proc_fini(&lmv->lmv_fld);
2739                 lprocfs_obd_cleanup(obd);
2740                 lprocfs_free_md_stats(obd);
2741                 break;
2742         default:
2743                 break;
2744         }
2745         RETURN(rc);
2746 }
2747
2748 static int lmv_get_info(const struct lu_env *env, struct obd_export *exp,
2749                         __u32 keylen, void *key, __u32 *vallen, void *val,
2750                         struct lov_stripe_md *lsm)
2751 {
2752         struct obd_device       *obd;
2753         struct lmv_obd          *lmv;
2754         int                      rc = 0;
2755         ENTRY;
2756
2757         obd = class_exp2obd(exp);
2758         if (obd == NULL) {
2759                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2760                        exp->exp_handle.h_cookie);
2761                 RETURN(-EINVAL);
2762         }
2763
2764         lmv = &obd->u.lmv;
2765         if (keylen >= strlen("remote_flag") && !strcmp(key, "remote_flag")) {
2766                 int i;
2767
2768                 rc = lmv_check_connect(obd);
2769                 if (rc)
2770                         RETURN(rc);
2771
2772                 LASSERT(*vallen == sizeof(__u32));
2773                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2774                         struct lmv_tgt_desc *tgt = lmv->tgts[i];
2775                         /*
2776                          * All tgts should be connected when this gets called.
2777                          */
2778                         if (tgt == NULL || tgt->ltd_exp == NULL)
2779                                 continue;
2780
2781                         if (!obd_get_info(env, tgt->ltd_exp, keylen, key,
2782                                           vallen, val, NULL))
2783                                 RETURN(0);
2784                 }
2785                 RETURN(-EINVAL);
2786         } else if (KEY_IS(KEY_MAX_EASIZE) ||
2787                    KEY_IS(KEY_DEFAULT_EASIZE) ||
2788                    KEY_IS(KEY_MAX_COOKIESIZE) ||
2789                    KEY_IS(KEY_DEFAULT_COOKIESIZE) ||
2790                    KEY_IS(KEY_CONN_DATA)) {
2791                 rc = lmv_check_connect(obd);
2792                 if (rc)
2793                         RETURN(rc);
2794
2795                 /*
2796                  * Forwarding this request to first MDS, it should know LOV
2797                  * desc.
2798                  */
2799                 rc = obd_get_info(env, lmv->tgts[0]->ltd_exp, keylen, key,
2800                                   vallen, val, NULL);
2801                 if (!rc && KEY_IS(KEY_CONN_DATA))
2802                         exp->exp_connect_data = *(struct obd_connect_data *)val;
2803                 RETURN(rc);
2804         } else if (KEY_IS(KEY_TGT_COUNT)) {
2805                 *((int *)val) = lmv->desc.ld_tgt_count;
2806                 RETURN(0);
2807         }
2808
2809         CDEBUG(D_IOCTL, "Invalid key\n");
2810         RETURN(-EINVAL);
2811 }
2812
2813 int lmv_set_info_async(const struct lu_env *env, struct obd_export *exp,
2814                        obd_count keylen, void *key, obd_count vallen,
2815                        void *val, struct ptlrpc_request_set *set)
2816 {
2817         struct lmv_tgt_desc    *tgt = NULL;
2818         struct obd_device      *obd;
2819         struct lmv_obd         *lmv;
2820         int rc = 0;
2821         ENTRY;
2822
2823         obd = class_exp2obd(exp);
2824         if (obd == NULL) {
2825                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2826                        exp->exp_handle.h_cookie);
2827                 RETURN(-EINVAL);
2828         }
2829         lmv = &obd->u.lmv;
2830
2831         if (KEY_IS(KEY_READ_ONLY) || KEY_IS(KEY_FLUSH_CTX)) {
2832                 int i, err = 0;
2833
2834                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2835                         tgt = lmv->tgts[i];
2836
2837                         if (tgt == NULL || tgt->ltd_exp == NULL)
2838                                 continue;
2839
2840                         err = obd_set_info_async(env, tgt->ltd_exp,
2841                                                  keylen, key, vallen, val, set);
2842                         if (err && rc == 0)
2843                                 rc = err;
2844                 }
2845
2846                 RETURN(rc);
2847         }
2848
2849         RETURN(-EINVAL);
2850 }
2851
2852 static int lmv_pack_md_v1(const struct lmv_stripe_md *lsm,
2853                           struct lmv_mds_md_v1 *lmm1)
2854 {
2855         int     cplen;
2856         int     i;
2857
2858         lmm1->lmv_magic = cpu_to_le32(lsm->lsm_md_magic);
2859         lmm1->lmv_stripe_count = cpu_to_le32(lsm->lsm_md_stripe_count);
2860         lmm1->lmv_master_mdt_index = cpu_to_le32(lsm->lsm_md_master_mdt_index);
2861         lmm1->lmv_hash_type = cpu_to_le32(lsm->lsm_md_hash_type);
2862         cplen = strlcpy(lmm1->lmv_pool_name, lsm->lsm_md_pool_name,
2863                         sizeof(lmm1->lmv_pool_name));
2864         if (cplen >= sizeof(lmm1->lmv_pool_name))
2865                 return -E2BIG;
2866
2867         for (i = 0; i < lsm->lsm_md_stripe_count; i++)
2868                 fid_cpu_to_le(&lmm1->lmv_stripe_fids[i],
2869                               &lsm->lsm_md_oinfo[i].lmo_fid);
2870         return 0;
2871 }
2872
2873 int lmv_pack_md(union lmv_mds_md **lmmp, const struct lmv_stripe_md *lsm,
2874                 int stripe_count)
2875 {
2876         int     lmm_size = 0;
2877         bool    allocated = false;
2878         int     rc = 0;
2879         ENTRY;
2880
2881         LASSERT(lmmp != NULL);
2882         /* Free lmm */
2883         if (*lmmp != NULL && lsm == NULL) {
2884                 int stripe_count;
2885
2886                 stripe_count = lmv_mds_md_stripe_count_get(*lmmp);
2887                 lmm_size = lmv_mds_md_size(stripe_count,
2888                                            le32_to_cpu((*lmmp)->lmv_magic));
2889                 if (lmm_size == 0)
2890                         RETURN(-EINVAL);
2891                 OBD_FREE(*lmmp, lmm_size);
2892                 *lmmp = NULL;
2893                 RETURN(0);
2894         }
2895
2896         /* Alloc lmm */
2897         if (*lmmp == NULL && lsm == NULL) {
2898                 lmm_size = lmv_mds_md_size(stripe_count, LMV_MAGIC);
2899                 LASSERT(lmm_size > 0);
2900                 OBD_ALLOC(*lmmp, lmm_size);
2901                 if (*lmmp == NULL)
2902                         RETURN(-ENOMEM);
2903                 lmv_mds_md_stripe_count_set(*lmmp, stripe_count);
2904                 (*lmmp)->lmv_magic = cpu_to_le32(LMV_MAGIC);
2905                 RETURN(lmm_size);
2906         }
2907
2908         /* pack lmm */
2909         LASSERT(lsm != NULL);
2910         lmm_size = lmv_mds_md_size(lsm->lsm_md_stripe_count, lsm->lsm_md_magic);
2911         if (*lmmp == NULL) {
2912                 OBD_ALLOC(*lmmp, lmm_size);
2913                 if (*lmmp == NULL)
2914                         RETURN(-ENOMEM);
2915                 allocated = true;
2916         }
2917
2918         switch (lsm->lsm_md_magic) {
2919         case LMV_MAGIC_V1:
2920                 rc = lmv_pack_md_v1(lsm, &(*lmmp)->lmv_md_v1);
2921                 break;
2922         default:
2923                 rc = -EINVAL;
2924                 break;
2925         }
2926
2927         if (rc != 0 && allocated) {
2928                 OBD_FREE(*lmmp, lmm_size);
2929                 *lmmp = NULL;
2930         }
2931
2932         RETURN(lmm_size);
2933 }
2934
2935 static int lmv_unpack_md_v1(struct obd_export *exp, struct lmv_stripe_md *lsm,
2936                             const struct lmv_mds_md_v1 *lmm1)
2937 {
2938         struct lmv_obd  *lmv = &exp->exp_obd->u.lmv;
2939         int             stripe_count;
2940         int             cplen;
2941         int             i;
2942         int             rc = 0;
2943         ENTRY;
2944
2945         lsm->lsm_md_magic = le32_to_cpu(lmm1->lmv_magic);
2946         lsm->lsm_md_stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
2947         lsm->lsm_md_master_mdt_index = le32_to_cpu(lmm1->lmv_master_mdt_index);
2948         if (OBD_FAIL_CHECK(OBD_FAIL_UNKNOWN_LMV_STRIPE))
2949                 lsm->lsm_md_hash_type = LMV_HASH_TYPE_UNKNOWN;
2950         else
2951                 lsm->lsm_md_hash_type = le32_to_cpu(lmm1->lmv_hash_type);
2952         lsm->lsm_md_layout_version = le32_to_cpu(lmm1->lmv_layout_version);
2953         cplen = strlcpy(lsm->lsm_md_pool_name, lmm1->lmv_pool_name,
2954                         sizeof(lsm->lsm_md_pool_name));
2955
2956         if (cplen >= sizeof(lsm->lsm_md_pool_name))
2957                 RETURN(-E2BIG);
2958
2959         CDEBUG(D_INFO, "unpack lsm count %d, master %d hash_type %d"
2960                "layout_version %d\n", lsm->lsm_md_stripe_count,
2961                lsm->lsm_md_master_mdt_index, lsm->lsm_md_hash_type,
2962                lsm->lsm_md_layout_version);
2963
2964         stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
2965         for (i = 0; i < stripe_count; i++) {
2966                 fid_le_to_cpu(&lsm->lsm_md_oinfo[i].lmo_fid,
2967                               &lmm1->lmv_stripe_fids[i]);
2968                 rc = lmv_fld_lookup(lmv, &lsm->lsm_md_oinfo[i].lmo_fid,
2969                                     &lsm->lsm_md_oinfo[i].lmo_mds);
2970                 if (rc != 0)
2971                         RETURN(rc);
2972                 CDEBUG(D_INFO, "unpack fid #%d "DFID"\n", i,
2973                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid));
2974         }
2975
2976         RETURN(rc);
2977 }
2978
2979 int lmv_unpack_md(struct obd_export *exp, struct lmv_stripe_md **lsmp,
2980                   const union lmv_mds_md *lmm, int stripe_count)
2981 {
2982         struct lmv_stripe_md     *lsm;
2983         int                      lsm_size;
2984         int                      rc;
2985         bool                     allocated = false;
2986         ENTRY;
2987
2988         LASSERT(lsmp != NULL);
2989
2990         lsm = *lsmp;
2991         /* Free memmd */
2992         if (lsm != NULL && lmm == NULL) {
2993                 int i;
2994                 for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
2995                         /* For migrating inode, the master stripe and master
2996                          * object will be the same, so do not need iput, see
2997                          * ll_update_lsm_md */
2998                         if (!(lsm->lsm_md_hash_type & LMV_HASH_FLAG_MIGRATION &&
2999                               i == 0) && lsm->lsm_md_oinfo[i].lmo_root != NULL)
3000                                 iput(lsm->lsm_md_oinfo[i].lmo_root);
3001                 }
3002                 lsm_size = lmv_stripe_md_size(lsm->lsm_md_stripe_count);
3003                 OBD_FREE(lsm, lsm_size);
3004                 *lsmp = NULL;
3005                 RETURN(0);
3006         }
3007
3008         /* Alloc memmd */
3009         if (lsm == NULL && lmm == NULL) {
3010                 lsm_size = lmv_stripe_md_size(stripe_count);
3011                 OBD_ALLOC(lsm, lsm_size);
3012                 if (lsm == NULL)
3013                         RETURN(-ENOMEM);
3014                 lsm->lsm_md_stripe_count = stripe_count;
3015                 *lsmp = lsm;
3016                 RETURN(0);
3017         }
3018
3019         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE)
3020                 RETURN(-EPERM);
3021
3022         /* Unpack memmd */
3023         if (le32_to_cpu(lmm->lmv_magic) != LMV_MAGIC_V1 &&
3024             le32_to_cpu(lmm->lmv_magic) != LMV_USER_MAGIC) {
3025                 CERROR("%s: invalid lmv magic %x: rc = %d\n",
3026                        exp->exp_obd->obd_name, le32_to_cpu(lmm->lmv_magic),
3027                        -EIO);
3028                 RETURN(-EIO);
3029         }
3030
3031         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_V1)
3032                 lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
3033         else
3034                 /**
3035                  * Unpack default dirstripe(lmv_user_md) to lmv_stripe_md,
3036                  * stripecount should be 0 then.
3037                  */
3038                 lsm_size = lmv_stripe_md_size(0);
3039
3040         lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
3041         if (lsm == NULL) {
3042                 OBD_ALLOC(lsm, lsm_size);
3043                 if (lsm == NULL)
3044                         RETURN(-ENOMEM);
3045                 allocated = true;
3046                 *lsmp = lsm;
3047         }
3048
3049         switch (le32_to_cpu(lmm->lmv_magic)) {
3050         case LMV_MAGIC_V1:
3051                 rc = lmv_unpack_md_v1(exp, lsm, &lmm->lmv_md_v1);
3052                 break;
3053         default:
3054                 CERROR("%s: unrecognized magic %x\n", exp->exp_obd->obd_name,
3055                        le32_to_cpu(lmm->lmv_magic));
3056                 rc = -EINVAL;
3057                 break;
3058         }
3059
3060         if (rc != 0 && allocated) {
3061                 OBD_FREE(lsm, lsm_size);
3062                 *lsmp = NULL;
3063                 lsm_size = rc;
3064         }
3065         RETURN(lsm_size);
3066 }
3067
3068 int lmv_alloc_memmd(struct lmv_stripe_md **lsmp, int stripes)
3069 {
3070         return lmv_unpack_md(NULL, lsmp, NULL, stripes);
3071 }
3072
3073 void lmv_free_memmd(struct lmv_stripe_md *lsm)
3074 {
3075         lmv_unpack_md(NULL, &lsm, NULL, 0);
3076 }
3077 EXPORT_SYMBOL(lmv_free_memmd);
3078
3079 int lmv_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
3080                  struct lov_mds_md *lmm, int disk_len)
3081 {
3082         return lmv_unpack_md(exp, (struct lmv_stripe_md **)lsmp,
3083                              (union lmv_mds_md *)lmm, disk_len);
3084 }
3085
3086 int lmv_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
3087                struct lov_stripe_md *lsm)
3088 {
3089         struct obd_device               *obd = exp->exp_obd;
3090         struct lmv_obd                  *lmv_obd = &obd->u.lmv;
3091         const struct lmv_stripe_md      *lmv = (struct lmv_stripe_md *)lsm;
3092         int                             stripe_count;
3093
3094         if (lmmp == NULL) {
3095                 if (lsm != NULL)
3096                         stripe_count = lmv->lsm_md_stripe_count;
3097                 else
3098                         stripe_count = lmv_obd->desc.ld_tgt_count;
3099
3100                 return lmv_mds_md_size(stripe_count, LMV_MAGIC_V1);
3101         }
3102
3103         return lmv_pack_md((union lmv_mds_md **)lmmp, lmv, 0);
3104 }
3105
3106 static int lmv_cancel_unused(struct obd_export *exp, const struct lu_fid *fid,
3107                              ldlm_policy_data_t *policy, ldlm_mode_t mode,
3108                              ldlm_cancel_flags_t flags, void *opaque)
3109 {
3110         struct obd_device       *obd = exp->exp_obd;
3111         struct lmv_obd          *lmv = &obd->u.lmv;
3112         int                      rc = 0;
3113         int                      err;
3114         __u32                    i;
3115         ENTRY;
3116
3117         LASSERT(fid != NULL);
3118
3119         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3120                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
3121
3122                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
3123                         continue;
3124
3125                 err = md_cancel_unused(tgt->ltd_exp, fid, policy, mode, flags,
3126                                        opaque);
3127                 if (!rc)
3128                         rc = err;
3129         }
3130         RETURN(rc);
3131 }
3132
3133 int lmv_set_lock_data(struct obd_export *exp, __u64 *lockh, void *data,
3134                       __u64 *bits)
3135 {
3136         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3137         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3138         int                      rc;
3139         ENTRY;
3140
3141         if (tgt == NULL || tgt->ltd_exp == NULL)
3142                 RETURN(-EINVAL);
3143         rc =  md_set_lock_data(tgt->ltd_exp, lockh, data, bits);
3144         RETURN(rc);
3145 }
3146
3147 ldlm_mode_t lmv_lock_match(struct obd_export *exp, __u64 flags,
3148                            const struct lu_fid *fid, ldlm_type_t type,
3149                            ldlm_policy_data_t *policy, ldlm_mode_t mode,
3150                            struct lustre_handle *lockh)
3151 {
3152         struct obd_device       *obd = exp->exp_obd;
3153         struct lmv_obd          *lmv = &obd->u.lmv;
3154         ldlm_mode_t             rc;
3155         int                     tgt;
3156         int                     i;
3157         ENTRY;
3158
3159         CDEBUG(D_INODE, "Lock match for "DFID"\n", PFID(fid));
3160
3161         /*
3162          * With DNE every object can have two locks in different namespaces:
3163          * lookup lock in space of MDT storing direntry and update/open lock in
3164          * space of MDT storing inode.  Try the MDT that the FID maps to first,
3165          * since this can be easily found, and only try others if that fails.
3166          */
3167         for (i = 0, tgt = lmv_find_target_index(lmv, fid);
3168              i < lmv->desc.ld_tgt_count;
3169              i++, tgt = (tgt + 1) % lmv->desc.ld_tgt_count) {
3170                 if (tgt < 0) {
3171                         CDEBUG(D_HA, "%s: "DFID" is inaccessible: rc = %d\n",
3172                                obd->obd_name, PFID(fid), tgt);
3173                         tgt = 0;
3174                 }
3175
3176                 if (lmv->tgts[tgt] == NULL ||
3177                     lmv->tgts[tgt]->ltd_exp == NULL ||
3178                     lmv->tgts[tgt]->ltd_active == 0)
3179                         continue;
3180
3181                 rc = md_lock_match(lmv->tgts[tgt]->ltd_exp, flags, fid,
3182                                    type, policy, mode, lockh);
3183                 if (rc)
3184                         RETURN(rc);
3185         }
3186
3187         RETURN(0);
3188 }
3189
3190 int lmv_get_lustre_md(struct obd_export *exp, struct ptlrpc_request *req,
3191                       struct obd_export *dt_exp, struct obd_export *md_exp,
3192                       struct lustre_md *md)
3193 {
3194         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3195         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3196
3197         if (tgt == NULL || tgt->ltd_exp == NULL)
3198                 RETURN(-EINVAL);
3199
3200         return md_get_lustre_md(lmv->tgts[0]->ltd_exp, req, dt_exp, md_exp, md);
3201 }
3202
3203 int lmv_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
3204 {
3205         struct obd_device       *obd = exp->exp_obd;
3206         struct lmv_obd          *lmv = &obd->u.lmv;
3207         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3208         ENTRY;
3209
3210         if (md->lmv != NULL) {
3211                 lmv_free_memmd(md->lmv);
3212                 md->lmv = NULL;
3213         }
3214         if (tgt == NULL || tgt->ltd_exp == NULL)
3215                 RETURN(-EINVAL);
3216         RETURN(md_free_lustre_md(lmv->tgts[0]->ltd_exp, md));
3217 }
3218
3219 int lmv_set_open_replay_data(struct obd_export *exp,
3220                              struct obd_client_handle *och,
3221                              struct lookup_intent *it)
3222 {
3223         struct obd_device       *obd = exp->exp_obd;
3224         struct lmv_obd          *lmv = &obd->u.lmv;
3225         struct lmv_tgt_desc     *tgt;
3226         ENTRY;
3227
3228         tgt = lmv_find_target(lmv, &och->och_fid);
3229         if (IS_ERR(tgt))
3230                 RETURN(PTR_ERR(tgt));
3231
3232         RETURN(md_set_open_replay_data(tgt->ltd_exp, och, it));
3233 }
3234
3235 int lmv_clear_open_replay_data(struct obd_export *exp,
3236                                struct obd_client_handle *och)
3237 {
3238         struct obd_device       *obd = exp->exp_obd;
3239         struct lmv_obd          *lmv = &obd->u.lmv;
3240         struct lmv_tgt_desc     *tgt;
3241         ENTRY;
3242
3243         tgt = lmv_find_target(lmv, &och->och_fid);
3244         if (IS_ERR(tgt))
3245                 RETURN(PTR_ERR(tgt));
3246
3247         RETURN(md_clear_open_replay_data(tgt->ltd_exp, och));
3248 }
3249
3250 static int lmv_get_remote_perm(struct obd_export *exp,
3251                                const struct lu_fid *fid,
3252                                struct obd_capa *oc, __u32 suppgid,
3253                                struct ptlrpc_request **request)
3254 {
3255         struct obd_device       *obd = exp->exp_obd;
3256         struct lmv_obd          *lmv = &obd->u.lmv;
3257         struct lmv_tgt_desc     *tgt;
3258         int                      rc;
3259         ENTRY;
3260
3261         rc = lmv_check_connect(obd);
3262         if (rc)
3263                 RETURN(rc);
3264
3265         tgt = lmv_find_target(lmv, fid);
3266         if (IS_ERR(tgt))
3267                 RETURN(PTR_ERR(tgt));
3268
3269         rc = md_get_remote_perm(tgt->ltd_exp, fid, oc, suppgid, request);
3270         RETURN(rc);
3271 }
3272
3273 static int lmv_renew_capa(struct obd_export *exp, struct obd_capa *oc,
3274                           renew_capa_cb_t cb)
3275 {
3276         struct obd_device       *obd = exp->exp_obd;
3277         struct lmv_obd          *lmv = &obd->u.lmv;
3278         struct lmv_tgt_desc     *tgt;
3279         int                      rc;
3280         ENTRY;
3281
3282         rc = lmv_check_connect(obd);
3283         if (rc)
3284                 RETURN(rc);
3285
3286         tgt = lmv_find_target(lmv, &oc->c_capa.lc_fid);
3287         if (IS_ERR(tgt))
3288                 RETURN(PTR_ERR(tgt));
3289
3290         rc = md_renew_capa(tgt->ltd_exp, oc, cb);
3291         RETURN(rc);
3292 }
3293
3294 int lmv_unpack_capa(struct obd_export *exp, struct ptlrpc_request *req,
3295                     const struct req_msg_field *field, struct obd_capa **oc)
3296 {
3297         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3298         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3299
3300         if (tgt == NULL || tgt->ltd_exp == NULL)
3301                 RETURN(-EINVAL);
3302         return md_unpack_capa(tgt->ltd_exp, req, field, oc);
3303 }
3304
3305 int lmv_intent_getattr_async(struct obd_export *exp,
3306                              struct md_enqueue_info *minfo,
3307                              struct ldlm_enqueue_info *einfo)
3308 {
3309         struct md_op_data       *op_data = &minfo->mi_data;
3310         struct obd_device       *obd = exp->exp_obd;
3311         struct lmv_obd          *lmv = &obd->u.lmv;
3312         struct lmv_tgt_desc     *tgt = NULL;
3313         int                      rc;
3314         ENTRY;
3315
3316         rc = lmv_check_connect(obd);
3317         if (rc)
3318                 RETURN(rc);
3319
3320         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
3321         if (IS_ERR(tgt))
3322                 RETURN(PTR_ERR(tgt));
3323
3324         rc = md_intent_getattr_async(tgt->ltd_exp, minfo, einfo);
3325         RETURN(rc);
3326 }
3327
3328 int lmv_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
3329                         struct lu_fid *fid, __u64 *bits)
3330 {
3331         struct obd_device       *obd = exp->exp_obd;
3332         struct lmv_obd          *lmv = &obd->u.lmv;
3333         struct lmv_tgt_desc     *tgt;
3334         int                      rc;
3335         ENTRY;
3336
3337         rc = lmv_check_connect(obd);
3338         if (rc)
3339                 RETURN(rc);
3340
3341         tgt = lmv_find_target(lmv, fid);
3342         if (IS_ERR(tgt))
3343                 RETURN(PTR_ERR(tgt));
3344
3345         rc = md_revalidate_lock(tgt->ltd_exp, it, fid, bits);
3346         RETURN(rc);
3347 }
3348
3349 int lmv_get_fid_from_lsm(struct obd_export *exp,
3350                          const struct lmv_stripe_md *lsm,
3351                          const char *name, int namelen, struct lu_fid *fid)
3352 {
3353         const struct lmv_oinfo *oinfo;
3354
3355         LASSERT(lsm != NULL);
3356         oinfo = lsm_name_to_stripe_info(lsm, name, namelen);
3357         if (IS_ERR(oinfo))
3358                 return PTR_ERR(oinfo);
3359
3360         *fid = oinfo->lmo_fid;
3361
3362         RETURN(0);
3363 }
3364
3365 /**
3366  * For lmv, only need to send request to master MDT, and the master MDT will
3367  * process with other slave MDTs. The only exception is Q_GETOQUOTA for which
3368  * we directly fetch data from the slave MDTs.
3369  */
3370 int lmv_quotactl(struct obd_device *unused, struct obd_export *exp,
3371                  struct obd_quotactl *oqctl)
3372 {
3373         struct obd_device   *obd = class_exp2obd(exp);
3374         struct lmv_obd      *lmv = &obd->u.lmv;
3375         struct lmv_tgt_desc *tgt = lmv->tgts[0];
3376         int                  rc = 0;
3377         __u32                i;
3378         __u64                curspace, curinodes;
3379         ENTRY;
3380
3381         if (tgt == NULL ||
3382             tgt->ltd_exp == NULL ||
3383             !tgt->ltd_active ||
3384             lmv->desc.ld_tgt_count == 0) {
3385                 CERROR("master lmv inactive\n");
3386                 RETURN(-EIO);
3387         }
3388
3389         if (oqctl->qc_cmd != Q_GETOQUOTA) {
3390                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
3391                 RETURN(rc);
3392         }
3393
3394         curspace = curinodes = 0;
3395         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3396                 int err;
3397                 tgt = lmv->tgts[i];
3398
3399                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
3400                         continue;
3401
3402                 err = obd_quotactl(tgt->ltd_exp, oqctl);
3403                 if (err) {
3404                         CERROR("getquota on mdt %d failed. %d\n", i, err);
3405                         if (!rc)
3406                                 rc = err;
3407                 } else {
3408                         curspace += oqctl->qc_dqblk.dqb_curspace;
3409                         curinodes += oqctl->qc_dqblk.dqb_curinodes;
3410                 }
3411         }
3412         oqctl->qc_dqblk.dqb_curspace = curspace;
3413         oqctl->qc_dqblk.dqb_curinodes = curinodes;
3414
3415         RETURN(rc);
3416 }
3417
3418 int lmv_quotacheck(struct obd_device *unused, struct obd_export *exp,
3419                    struct obd_quotactl *oqctl)
3420 {
3421         struct obd_device       *obd = class_exp2obd(exp);
3422         struct lmv_obd          *lmv = &obd->u.lmv;
3423         struct lmv_tgt_desc     *tgt;
3424         __u32                    i;
3425         int                      rc = 0;
3426         ENTRY;
3427
3428         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3429                 int err;
3430                 tgt = lmv->tgts[i];
3431                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active) {
3432                         CERROR("lmv idx %d inactive\n", i);
3433                         RETURN(-EIO);
3434                 }
3435
3436                 err = obd_quotacheck(tgt->ltd_exp, oqctl);
3437                 if (err && !rc)
3438                         rc = err;
3439         }
3440
3441         RETURN(rc);
3442 }
3443
3444 static int lmv_merge_attr(struct obd_export *exp,
3445                           const struct lmv_stripe_md *lsm,
3446                           struct cl_attr *attr,
3447                           ldlm_blocking_callback cb_blocking)
3448 {
3449         int rc;
3450         int i;
3451
3452         rc = lmv_revalidate_slaves(exp, lsm, cb_blocking, 0);
3453         if (rc < 0)
3454                 return rc;
3455
3456         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
3457                 struct inode *inode = lsm->lsm_md_oinfo[i].lmo_root;
3458
3459                 CDEBUG(D_INFO, ""DFID" size %llu, blocks %llu nlink %u,"
3460                        " atime %lu ctime %lu, mtime %lu.\n",
3461                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid),
3462                        i_size_read(inode), (unsigned long long)inode->i_blocks,
3463                        inode->i_nlink, LTIME_S(inode->i_atime),
3464                        LTIME_S(inode->i_ctime), LTIME_S(inode->i_mtime));
3465
3466                 /* for slave stripe, it needs to subtract nlink for . and .. */
3467                 if (i != 0)
3468                         attr->cat_nlink += inode->i_nlink - 2;
3469                 else
3470                         attr->cat_nlink = inode->i_nlink;
3471
3472                 attr->cat_size += i_size_read(inode);
3473                 attr->cat_blocks += inode->i_blocks;
3474
3475                 if (attr->cat_atime < LTIME_S(inode->i_atime))
3476                         attr->cat_atime = LTIME_S(inode->i_atime);
3477
3478                 if (attr->cat_ctime < LTIME_S(inode->i_ctime))
3479                         attr->cat_ctime = LTIME_S(inode->i_ctime);
3480
3481                 if (attr->cat_mtime < LTIME_S(inode->i_mtime))
3482                         attr->cat_mtime = LTIME_S(inode->i_mtime);
3483         }
3484         return 0;
3485 }
3486
3487 struct obd_ops lmv_obd_ops = {
3488         .o_owner                = THIS_MODULE,
3489         .o_setup                = lmv_setup,
3490         .o_cleanup              = lmv_cleanup,
3491         .o_precleanup           = lmv_precleanup,
3492         .o_process_config       = lmv_process_config,
3493         .o_connect              = lmv_connect,
3494         .o_disconnect           = lmv_disconnect,
3495         .o_statfs               = lmv_statfs,
3496         .o_get_info             = lmv_get_info,
3497         .o_set_info_async       = lmv_set_info_async,
3498         .o_packmd               = lmv_packmd,
3499         .o_unpackmd             = lmv_unpackmd,
3500         .o_notify               = lmv_notify,
3501         .o_get_uuid             = lmv_get_uuid,
3502         .o_iocontrol            = lmv_iocontrol,
3503         .o_quotacheck           = lmv_quotacheck,
3504         .o_quotactl             = lmv_quotactl
3505 };
3506
3507 struct md_ops lmv_md_ops = {
3508         .m_getstatus            = lmv_getstatus,
3509         .m_null_inode           = lmv_null_inode,
3510         .m_find_cbdata          = lmv_find_cbdata,
3511         .m_close                = lmv_close,
3512         .m_create               = lmv_create,
3513         .m_done_writing         = lmv_done_writing,
3514         .m_enqueue              = lmv_enqueue,
3515         .m_getattr              = lmv_getattr,
3516         .m_getxattr             = lmv_getxattr,
3517         .m_getattr_name         = lmv_getattr_name,
3518         .m_intent_lock          = lmv_intent_lock,
3519         .m_link                 = lmv_link,
3520         .m_rename               = lmv_rename,
3521         .m_setattr              = lmv_setattr,
3522         .m_setxattr             = lmv_setxattr,
3523         .m_fsync                = lmv_fsync,
3524         .m_read_page            = lmv_read_page,
3525         .m_unlink               = lmv_unlink,
3526         .m_init_ea_size         = lmv_init_ea_size,
3527         .m_cancel_unused        = lmv_cancel_unused,
3528         .m_set_lock_data        = lmv_set_lock_data,
3529         .m_lock_match           = lmv_lock_match,
3530         .m_get_lustre_md        = lmv_get_lustre_md,
3531         .m_free_lustre_md       = lmv_free_lustre_md,
3532         .m_merge_attr           = lmv_merge_attr,
3533         .m_set_open_replay_data = lmv_set_open_replay_data,
3534         .m_clear_open_replay_data = lmv_clear_open_replay_data,
3535         .m_renew_capa           = lmv_renew_capa,
3536         .m_unpack_capa          = lmv_unpack_capa,
3537         .m_get_remote_perm      = lmv_get_remote_perm,
3538         .m_intent_getattr_async = lmv_intent_getattr_async,
3539         .m_revalidate_lock      = lmv_revalidate_lock,
3540         .m_get_fid_from_lsm     = lmv_get_fid_from_lsm,
3541 };
3542
3543 int __init lmv_init(void)
3544 {
3545         return class_register_type(&lmv_obd_ops, &lmv_md_ops, true, NULL,
3546                                    LUSTRE_LMV_NAME, NULL);
3547 }
3548
3549 static void lmv_exit(void)
3550 {
3551         class_unregister_type(LUSTRE_LMV_NAME);
3552 }
3553
3554 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
3555 MODULE_DESCRIPTION("Lustre Logical Metadata Volume OBD driver");
3556 MODULE_LICENSE("GPL");
3557
3558 module_init(lmv_init);
3559 module_exit(lmv_exit);