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 <lustre_kernelcomm.h>
  59 #include "lmv_internal.h"
  60
  61 static void lmv_activate_target(struct lmv_obd *lmv,
  62                                 struct lmv_tgt_desc *tgt,
  63                                 int activate)
  64 {
  65         if (tgt->ltd_active == activate)
  66                 return;
  67
  68         tgt->ltd_active = activate;
  69         lmv->desc.ld_active_tgt_count += (activate ? 1 : -1);
  70 }
  71
  72 /**
  73  * Error codes:
  74  *
  75  *  -EINVAL  : UUID can't be found in the LMV's target list
  76  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
  77  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
  78  */
  79 static int lmv_set_mdc_active(struct lmv_obd *lmv,
  80                               const struct obd_uuid *uuid,
  81                               int activate)
  82 {
  83         struct lmv_tgt_desc     *tgt = NULL;
  84         struct obd_device       *obd;
  85         __u32                    i;
  86         int                      rc = 0;
  87         ENTRY;
  88
  89         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
  90                         lmv, uuid->uuid, activate);
  91
  92         spin_lock(&lmv->lmv_lock);
  93         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
  94                 tgt = lmv->tgts[i];
  95                 if (tgt == NULL || tgt->ltd_exp == NULL)
  96                         continue;
  97
  98                 CDEBUG(D_INFO, "Target idx %d is %s conn "LPX64"\n", i,
  99                        tgt->ltd_uuid.uuid, tgt->ltd_exp->exp_handle.h_cookie);
 100
 101                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 102                         break;
 103         }
 104
 105         if (i == lmv->desc.ld_tgt_count)
 106                 GOTO(out_lmv_lock, rc = -EINVAL);
 107
 108         obd = class_exp2obd(tgt->ltd_exp);
 109         if (obd == NULL)
 110                 GOTO(out_lmv_lock, rc = -ENOTCONN);
 111
 112         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
 113                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
 114                obd->obd_type->typ_name, i);
 115         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0);
 116
 117         if (tgt->ltd_active == activate) {
 118                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
 119                        activate ? "" : "in");
 120                 GOTO(out_lmv_lock, rc);
 121         }
 122
 123         CDEBUG(D_INFO, "Marking OBD %p %sactive\n", obd,
 124                activate ? "" : "in");
 125         lmv_activate_target(lmv, tgt, activate);
 126         EXIT;
 127
 128  out_lmv_lock:
 129         spin_unlock(&lmv->lmv_lock);
 130         return rc;
 131 }
 132
 133 struct obd_uuid *lmv_get_uuid(struct obd_export *exp)
 134 {
 135         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
 136         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
 137
 138         return (tgt == NULL) ? NULL : obd_get_uuid(tgt->ltd_exp);
 139 }
 140
 141 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
 142                       enum obd_notify_event ev, void *data)
 143 {
 144         struct obd_connect_data *conn_data;
 145         struct lmv_obd          *lmv = &obd->u.lmv;
 146         struct obd_uuid         *uuid;
 147         int                      rc = 0;
 148         ENTRY;
 149
 150         if (strcmp(watched->obd_type->typ_name, LUSTRE_MDC_NAME)) {
 151                 CERROR("unexpected notification of %s %s!\n",
 152                        watched->obd_type->typ_name,
 153                        watched->obd_name);
 154                 RETURN(-EINVAL);
 155         }
 156
 157         uuid = &watched->u.cli.cl_target_uuid;
 158         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE) {
 159                 /*
 160                  * Set MDC as active before notifying the observer, so the
 161                  * observer can use the MDC normally.
 162                  */
 163                 rc = lmv_set_mdc_active(lmv, uuid,
 164                                         ev == OBD_NOTIFY_ACTIVE);
 165                 if (rc) {
 166                         CERROR("%sactivation of %s failed: %d\n",
 167                                ev == OBD_NOTIFY_ACTIVE ? "" : "de",
 168                                uuid->uuid, rc);
 169                         RETURN(rc);
 170                 }
 171         } else if (ev == OBD_NOTIFY_OCD) {
 172                 conn_data = &watched->u.cli.cl_import->imp_connect_data;
 173                 /*
 174                  * XXX: Make sure that ocd_connect_flags from all targets are
 175                  * the same. Otherwise one of MDTs runs wrong version or
 176                  * something like this.  --umka
 177                  */
 178                 obd->obd_self_export->exp_connect_data = *conn_data;
 179         }
 180 #if 0
 181         else if (ev == OBD_NOTIFY_DISCON) {
 182                 /*
 183                  * For disconnect event, flush fld cache for failout MDS case.
 184                  */
 185                 fld_client_flush(&lmv->lmv_fld);
 186         }
 187 #endif
 188         /*
 189          * Pass the notification up the chain.
 190          */
 191         if (obd->obd_observer)
 192                 rc = obd_notify(obd->obd_observer, watched, ev, data);
 193
 194         RETURN(rc);
 195 }
 196
 197 /**
 198  * This is fake connect function. Its purpose is to initialize lmv and say
 199  * caller that everything is okay. Real connection will be performed later.
 200  */
 201 static int lmv_connect(const struct lu_env *env,
 202                        struct obd_export **exp, struct obd_device *obd,
 203                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 204                        void *localdata)
 205 {
 206         struct lmv_obd        *lmv = &obd->u.lmv;
 207         struct lustre_handle  conn = { 0 };
 208         int                    rc = 0;
 209         ENTRY;
 210
 211         /*
 212          * We don't want to actually do the underlying connections more than
 213          * once, so keep track.
 214          */
 215         lmv->refcount++;
 216         if (lmv->refcount > 1) {
 217                 *exp = NULL;
 218                 RETURN(0);
 219         }
 220
 221         rc = class_connect(&conn, obd, cluuid);
 222         if (rc) {
 223                 CERROR("class_connection() returned %d\n", rc);
 224                 RETURN(rc);
 225         }
 226
 227         *exp = class_conn2export(&conn);
 228         class_export_get(*exp);
 229
 230         lmv->exp = *exp;
 231         lmv->connected = 0;
 232         lmv->cluuid = *cluuid;
 233
 234         if (data)
 235                 lmv->conn_data = *data;
 236
 237         if (lmv->targets_proc_entry == NULL) {
 238                 lmv->targets_proc_entry = lprocfs_register("target_obds",
 239                                                            obd->obd_proc_entry,
 240                                                            NULL, NULL);
 241                 if (IS_ERR(lmv->targets_proc_entry)) {
 242                         CERROR("%s: cannot register "
 243                                "/proc/fs/lustre/%s/%s/target_obds\n",
 244                                obd->obd_name, obd->obd_type->typ_name,
 245                                obd->obd_name);
 246                         lmv->targets_proc_entry = NULL;
 247                 }
 248         }
 249
 250         /*
 251          * All real clients should perform actual connection right away, because
 252          * it is possible, that LMV will not have opportunity to connect targets
 253          * and MDC stuff will be called directly, for instance while reading
 254          * ../mdc/../kbytesfree procfs file, etc.
 255          */
 256         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_REAL))
 257                 rc = lmv_check_connect(obd);
 258
 259         if (rc && lmv->targets_proc_entry != NULL)
 260                 lprocfs_remove(&lmv->targets_proc_entry);
 261         RETURN(rc);
 262 }
 263
 264 static int lmv_init_ea_size(struct obd_export *exp,
 265                             __u32 easize, __u32 def_easize,
 266                             __u32 cookiesize, __u32 def_cookiesize)
 267 {
 268         struct obd_device       *obd = exp->exp_obd;
 269         struct lmv_obd          *lmv = &obd->u.lmv;
 270         __u32                    i;
 271         int                      rc = 0;
 272         int                      change = 0;
 273         ENTRY;
 274
 275         if (lmv->max_easize < easize) {
 276                 lmv->max_easize = easize;
 277                 change = 1;
 278         }
 279         if (lmv->max_def_easize < def_easize) {
 280                 lmv->max_def_easize = def_easize;
 281                 change = 1;
 282         }
 283         if (lmv->max_cookiesize < cookiesize) {
 284                 lmv->max_cookiesize = cookiesize;
 285                 change = 1;
 286         }
 287         if (lmv->max_def_cookiesize < def_cookiesize) {
 288                 lmv->max_def_cookiesize = def_cookiesize;
 289                 change = 1;
 290         }
 291         if (change == 0)
 292                 RETURN(0);
 293
 294         if (lmv->connected == 0)
 295                 RETURN(0);
 296
 297         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 298                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 299
 300                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active) {
 301                         CWARN("%s: NULL export for %d\n", obd->obd_name, i);
 302                         continue;
 303                 }
 304
 305                 rc = md_init_ea_size(tgt->ltd_exp, easize, def_easize,
 306                                      cookiesize, def_cookiesize);
 307                 if (rc) {
 308                         CERROR("%s: obd_init_ea_size() failed on MDT target %d:"
 309                                " rc = %d\n", obd->obd_name, i, rc);
 310                         break;
 311                 }
 312         }
 313         RETURN(rc);
 314 }
 315
 316 #define MAX_STRING_SIZE 128
 317
 318 int lmv_connect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 319 {
 320         struct lmv_obd          *lmv = &obd->u.lmv;
 321         struct obd_uuid         *cluuid = &lmv->cluuid;
 322         struct obd_uuid          lmv_mdc_uuid = { "LMV_MDC_UUID" };
 323         struct obd_device       *mdc_obd;
 324         struct obd_export       *mdc_exp;
 325         struct lu_fld_target     target;
 326         int                      rc;
 327         ENTRY;
 328
 329         mdc_obd = class_find_client_obd(&tgt->ltd_uuid, LUSTRE_MDC_NAME,
 330                                         &obd->obd_uuid);
 331         if (!mdc_obd) {
 332                 CERROR("target %s not attached\n", tgt->ltd_uuid.uuid);
 333                 RETURN(-EINVAL);
 334         }
 335
 336         CDEBUG(D_CONFIG, "connect to %s(%s) - %s, %s FOR %s\n",
 337                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 338                 tgt->ltd_uuid.uuid, obd->obd_uuid.uuid,
 339                 cluuid->uuid);
 340
 341         if (!mdc_obd->obd_set_up) {
 342                 CERROR("target %s is not set up\n", tgt->ltd_uuid.uuid);
 343                 RETURN(-EINVAL);
 344         }
 345
 346         rc = obd_connect(NULL, &mdc_exp, mdc_obd, &lmv_mdc_uuid,
 347                          &lmv->conn_data, NULL);
 348         if (rc) {
 349                 CERROR("target %s connect error %d\n", tgt->ltd_uuid.uuid, rc);
 350                 RETURN(rc);
 351         }
 352
 353         /*
 354          * Init fid sequence client for this mdc and add new fld target.
 355          */
 356         rc = obd_fid_init(mdc_obd, mdc_exp, LUSTRE_SEQ_METADATA);
 357         if (rc)
 358                 RETURN(rc);
 359
 360         target.ft_srv = NULL;
 361         target.ft_exp = mdc_exp;
 362         target.ft_idx = tgt->ltd_idx;
 363
 364         fld_client_add_target(&lmv->lmv_fld, &target);
 365
 366         rc = obd_register_observer(mdc_obd, obd);
 367         if (rc) {
 368                 obd_disconnect(mdc_exp);
 369                 CERROR("target %s register_observer error %d\n",
 370                        tgt->ltd_uuid.uuid, rc);
 371                 RETURN(rc);
 372         }
 373
 374         if (obd->obd_observer) {
 375                 /*
 376                  * Tell the observer about the new target.
 377                  */
 378                 rc = obd_notify(obd->obd_observer, mdc_exp->exp_obd,
 379                                 OBD_NOTIFY_ACTIVE,
 380                                 (void *)(tgt - lmv->tgts[0]));
 381                 if (rc) {
 382                         obd_disconnect(mdc_exp);
 383                         RETURN(rc);
 384                 }
 385         }
 386
 387         tgt->ltd_active = 1;
 388         tgt->ltd_exp = mdc_exp;
 389         lmv->desc.ld_active_tgt_count++;
 390
 391         md_init_ea_size(tgt->ltd_exp, lmv->max_easize, lmv->max_def_easize,
 392                         lmv->max_cookiesize, lmv->max_def_cookiesize);
 393
 394         CDEBUG(D_CONFIG, "Connected to %s(%s) successfully (%d)\n",
 395                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 396                 atomic_read(&obd->obd_refcount));
 397
 398         if (lmv->targets_proc_entry != NULL) {
 399                 struct proc_dir_entry *mdc_symlink;
 400
 401                 LASSERT(mdc_obd->obd_type != NULL);
 402                 LASSERT(mdc_obd->obd_type->typ_name != NULL);
 403                 mdc_symlink = lprocfs_add_symlink(mdc_obd->obd_name,
 404                                                   lmv->targets_proc_entry,
 405                                                   "../../../%s/%s",
 406                                                   mdc_obd->obd_type->typ_name,
 407                                                   mdc_obd->obd_name);
 408                 if (mdc_symlink == NULL) {
 409                         CERROR("cannot register LMV target "
 410                                "/proc/fs/lustre/%s/%s/target_obds/%s\n",
 411                                obd->obd_type->typ_name, obd->obd_name,
 412                                mdc_obd->obd_name);
 413                 }
 414         }
 415         RETURN(0);
 416 }
 417
 418 static void lmv_del_target(struct lmv_obd *lmv, int index)
 419 {
 420         if (lmv->tgts[index] == NULL)
 421                 return;
 422
 423         OBD_FREE_PTR(lmv->tgts[index]);
 424         lmv->tgts[index] = NULL;
 425         return;
 426 }
 427
 428 static int lmv_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 429                            __u32 index, int gen)
 430 {
 431         struct lmv_obd      *lmv = &obd->u.lmv;
 432         struct lmv_tgt_desc *tgt;
 433         int                  orig_tgt_count = 0;
 434         int                  rc = 0;
 435         ENTRY;
 436
 437         CDEBUG(D_CONFIG, "Target uuid: %s. index %d\n", uuidp->uuid, index);
 438
 439         mutex_lock(&lmv->lmv_init_mutex);
 440
 441         if (lmv->desc.ld_tgt_count == 0) {
 442                 struct obd_device *mdc_obd;
 443
 444                 mdc_obd = class_find_client_obd(uuidp, LUSTRE_MDC_NAME,
 445                                                 &obd->obd_uuid);
 446                 if (!mdc_obd) {
 447                         mutex_unlock(&lmv->lmv_init_mutex);
 448                         CERROR("%s: Target %s not attached: rc = %d\n",
 449                                obd->obd_name, uuidp->uuid, -EINVAL);
 450                         RETURN(-EINVAL);
 451                 }
 452         }
 453
 454         if ((index < lmv->tgts_size) && (lmv->tgts[index] != NULL)) {
 455                 tgt = lmv->tgts[index];
 456                 CERROR("%s: UUID %s already assigned at LOV target index %d:"
 457                        " rc = %d\n", obd->obd_name,
 458                        obd_uuid2str(&tgt->ltd_uuid), index, -EEXIST);
 459                 mutex_unlock(&lmv->lmv_init_mutex);
 460                 RETURN(-EEXIST);
 461         }
 462
 463         if (index >= lmv->tgts_size) {
 464                 /* We need to reallocate the lmv target array. */
 465                 struct lmv_tgt_desc **newtgts, **old = NULL;
 466                 __u32 newsize = 1;
 467                 __u32 oldsize = 0;
 468
 469                 while (newsize < index + 1)
 470                         newsize = newsize << 1;
 471                 OBD_ALLOC(newtgts, sizeof(*newtgts) * newsize);
 472                 if (newtgts == NULL) {
 473                         mutex_unlock(&lmv->lmv_init_mutex);
 474                         RETURN(-ENOMEM);
 475                 }
 476
 477                 if (lmv->tgts_size) {
 478                         memcpy(newtgts, lmv->tgts,
 479                                sizeof(*newtgts) * lmv->tgts_size);
 480                         old = lmv->tgts;
 481                         oldsize = lmv->tgts_size;
 482                 }
 483
 484                 lmv->tgts = newtgts;
 485                 lmv->tgts_size = newsize;
 486                 smp_rmb();
 487                 if (old)
 488                         OBD_FREE(old, sizeof(*old) * oldsize);
 489
 490                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n", lmv->tgts,
 491                        lmv->tgts_size);
 492         }
 493
 494         OBD_ALLOC_PTR(tgt);
 495         if (!tgt) {
 496                 mutex_unlock(&lmv->lmv_init_mutex);
 497                 RETURN(-ENOMEM);
 498         }
 499
 500         mutex_init(&tgt->ltd_fid_mutex);
 501         tgt->ltd_idx = index;
 502         tgt->ltd_uuid = *uuidp;
 503         tgt->ltd_active = 0;
 504         lmv->tgts[index] = tgt;
 505         if (index >= lmv->desc.ld_tgt_count) {
 506                 orig_tgt_count = lmv->desc.ld_tgt_count;
 507                 lmv->desc.ld_tgt_count = index + 1;
 508         }
 509
 510         if (lmv->connected) {
 511                 rc = lmv_connect_mdc(obd, tgt);
 512                 if (rc != 0) {
 513                         spin_lock(&lmv->lmv_lock);
 514                         if (lmv->desc.ld_tgt_count == index + 1)
 515                                 lmv->desc.ld_tgt_count = orig_tgt_count;
 516                         memset(tgt, 0, sizeof(*tgt));
 517                         spin_unlock(&lmv->lmv_lock);
 518                 } else {
 519                         int easize = sizeof(struct lmv_stripe_md) +
 520                                 lmv->desc.ld_tgt_count * sizeof(struct lu_fid);
 521                         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0, 0);
 522                 }
 523         }
 524
 525         mutex_unlock(&lmv->lmv_init_mutex);
 526         RETURN(rc);
 527 }
 528
 529 int lmv_check_connect(struct obd_device *obd)
 530 {
 531         struct lmv_obd          *lmv = &obd->u.lmv;
 532         struct lmv_tgt_desc     *tgt;
 533         __u32                    i;
 534         int                      rc;
 535         int                      easize;
 536         ENTRY;
 537
 538         if (lmv->connected)
 539                 RETURN(0);
 540
 541         mutex_lock(&lmv->lmv_init_mutex);
 542         if (lmv->connected) {
 543                 mutex_unlock(&lmv->lmv_init_mutex);
 544                 RETURN(0);
 545         }
 546
 547         if (lmv->desc.ld_tgt_count == 0) {
 548                 mutex_unlock(&lmv->lmv_init_mutex);
 549                 CERROR("%s: no targets configured.\n", obd->obd_name);
 550                 RETURN(-EINVAL);
 551         }
 552
 553         LASSERT(lmv->tgts != NULL);
 554
 555         if (lmv->tgts[0] == NULL) {
 556                 mutex_unlock(&lmv->lmv_init_mutex);
 557                 CERROR("%s: no target configured for index 0.\n",
 558                        obd->obd_name);
 559                 RETURN(-EINVAL);
 560         }
 561
 562         CDEBUG(D_CONFIG, "Time to connect %s to %s\n",
 563                lmv->cluuid.uuid, obd->obd_name);
 564
 565         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 566                 tgt = lmv->tgts[i];
 567                 if (tgt == NULL)
 568                         continue;
 569                 rc = lmv_connect_mdc(obd, tgt);
 570                 if (rc)
 571                         GOTO(out_disc, rc);
 572         }
 573
 574         class_export_put(lmv->exp);
 575         lmv->connected = 1;
 576         easize = lmv_mds_md_size(lmv->desc.ld_tgt_count, LMV_MAGIC);
 577         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0, 0);
 578         mutex_unlock(&lmv->lmv_init_mutex);
 579         RETURN(0);
 580
 581  out_disc:
 582         while (i-- > 0) {
 583                 int rc2;
 584                 tgt = lmv->tgts[i];
 585                 if (tgt == NULL)
 586                         continue;
 587                 tgt->ltd_active = 0;
 588                 if (tgt->ltd_exp) {
 589                         --lmv->desc.ld_active_tgt_count;
 590                         rc2 = obd_disconnect(tgt->ltd_exp);
 591                         if (rc2) {
 592                                 CERROR("LMV target %s disconnect on "
 593                                        "MDC idx %d: error %d\n",
 594                                        tgt->ltd_uuid.uuid, i, rc2);
 595                         }
 596                 }
 597         }
 598         class_disconnect(lmv->exp);
 599         mutex_unlock(&lmv->lmv_init_mutex);
 600         RETURN(rc);
 601 }
 602
 603 static int lmv_disconnect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 604 {
 605         struct lmv_obd         *lmv = &obd->u.lmv;
 606         struct obd_device      *mdc_obd;
 607         int                     rc;
 608         ENTRY;
 609
 610         LASSERT(tgt != NULL);
 611         LASSERT(obd != NULL);
 612
 613         mdc_obd = class_exp2obd(tgt->ltd_exp);
 614
 615         if (mdc_obd) {
 616                 mdc_obd->obd_force = obd->obd_force;
 617                 mdc_obd->obd_fail = obd->obd_fail;
 618                 mdc_obd->obd_no_recov = obd->obd_no_recov;
 619         }
 620
 621         if (lmv->targets_proc_entry != NULL)
 622                 lprocfs_remove_proc_entry(mdc_obd->obd_name,
 623                                           lmv->targets_proc_entry);
 624
 625         rc = obd_fid_fini(tgt->ltd_exp->exp_obd);
 626         if (rc)
 627                 CERROR("Can't finanize fids factory\n");
 628
 629         CDEBUG(D_INFO, "Disconnected from %s(%s) successfully\n",
 630                tgt->ltd_exp->exp_obd->obd_name,
 631                tgt->ltd_exp->exp_obd->obd_uuid.uuid);
 632
 633         obd_register_observer(tgt->ltd_exp->exp_obd, NULL);
 634         rc = obd_disconnect(tgt->ltd_exp);
 635         if (rc) {
 636                 if (tgt->ltd_active) {
 637                         CERROR("Target %s disconnect error %d\n",
 638                                tgt->ltd_uuid.uuid, rc);
 639                 }
 640         }
 641
 642         lmv_activate_target(lmv, tgt, 0);
 643         tgt->ltd_exp = NULL;
 644         RETURN(0);
 645 }
 646
 647 static int lmv_disconnect(struct obd_export *exp)
 648 {
 649         struct obd_device       *obd = class_exp2obd(exp);
 650         struct lmv_obd          *lmv = &obd->u.lmv;
 651         int                      rc;
 652         __u32                    i;
 653         ENTRY;
 654
 655         if (!lmv->tgts)
 656                 goto out_local;
 657
 658         /*
 659          * Only disconnect the underlying layers on the final disconnect.
 660          */
 661         lmv->refcount--;
 662         if (lmv->refcount != 0)
 663                 goto out_local;
 664
 665         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 666                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
 667                         continue;
 668
 669                 lmv_disconnect_mdc(obd, lmv->tgts[i]);
 670         }
 671
 672         if (lmv->targets_proc_entry != NULL)
 673                 lprocfs_remove(&lmv->targets_proc_entry);
 674         else
 675                 CERROR("/proc/fs/lustre/%s/%s/target_obds missing\n",
 676                        obd->obd_type->typ_name, obd->obd_name);
 677
 678 out_local:
 679         /*
 680          * This is the case when no real connection is established by
 681          * lmv_check_connect().
 682          */
 683         if (!lmv->connected)
 684                 class_export_put(exp);
 685         rc = class_disconnect(exp);
 686         if (lmv->refcount == 0)
 687                 lmv->connected = 0;
 688         RETURN(rc);
 689 }
 690
 691 static int lmv_fid2path(struct obd_export *exp, int len, void *karg, void *uarg)
 692 {
 693         struct obd_device       *obddev = class_exp2obd(exp);
 694         struct lmv_obd          *lmv = &obddev->u.lmv;
 695         struct getinfo_fid2path *gf;
 696         struct lmv_tgt_desc     *tgt;
 697         struct getinfo_fid2path *remote_gf = NULL;
 698         int                     remote_gf_size = 0;
 699         int                     rc;
 700
 701         gf = (struct getinfo_fid2path *)karg;
 702         tgt = lmv_find_target(lmv, &gf->gf_fid);
 703         if (IS_ERR(tgt))
 704                 RETURN(PTR_ERR(tgt));
 705
 706 repeat_fid2path:
 707         rc = obd_iocontrol(OBD_IOC_FID2PATH, tgt->ltd_exp, len, gf, uarg);
 708         if (rc != 0 && rc != -EREMOTE)
 709                 GOTO(out_fid2path, rc);
 710
 711         /* If remote_gf != NULL, it means just building the
 712          * path on the remote MDT, copy this path segement to gf */
 713         if (remote_gf != NULL) {
 714                 struct getinfo_fid2path *ori_gf;
 715                 char *ptr;
 716
 717                 ori_gf = (struct getinfo_fid2path *)karg;
 718                 if (strlen(ori_gf->gf_path) +
 719                     strlen(gf->gf_path) > ori_gf->gf_pathlen)
 720                         GOTO(out_fid2path, rc = -EOVERFLOW);
 721
 722                 ptr = ori_gf->gf_path;
 723
 724                 memmove(ptr + strlen(gf->gf_path) + 1, ptr,
 725                         strlen(ori_gf->gf_path));
 726
 727                 strncpy(ptr, gf->gf_path, strlen(gf->gf_path));
 728                 ptr += strlen(gf->gf_path);
 729                 *ptr = '/';
 730         }
 731
 732         CDEBUG(D_INFO, "%s: get path %s "DFID" rec: "LPU64" ln: %u\n",
 733                tgt->ltd_exp->exp_obd->obd_name,
 734                gf->gf_path, PFID(&gf->gf_fid), gf->gf_recno,
 735                gf->gf_linkno);
 736
 737         if (rc == 0)
 738                 GOTO(out_fid2path, rc);
 739
 740         /* sigh, has to go to another MDT to do path building further */
 741         if (remote_gf == NULL) {
 742                 remote_gf_size = sizeof(*remote_gf) + PATH_MAX;
 743                 OBD_ALLOC(remote_gf, remote_gf_size);
 744                 if (remote_gf == NULL)
 745                         GOTO(out_fid2path, rc = -ENOMEM);
 746                 remote_gf->gf_pathlen = PATH_MAX;
 747         }
 748
 749         if (!fid_is_sane(&gf->gf_fid)) {
 750                 CERROR("%s: invalid FID "DFID": rc = %d\n",
 751                        tgt->ltd_exp->exp_obd->obd_name,
 752                        PFID(&gf->gf_fid), -EINVAL);
 753                 GOTO(out_fid2path, rc = -EINVAL);
 754         }
 755
 756         tgt = lmv_find_target(lmv, &gf->gf_fid);
 757         if (IS_ERR(tgt))
 758                 GOTO(out_fid2path, rc = -EINVAL);
 759
 760         remote_gf->gf_fid = gf->gf_fid;
 761         remote_gf->gf_recno = -1;
 762         remote_gf->gf_linkno = -1;
 763         memset(remote_gf->gf_path, 0, remote_gf->gf_pathlen);
 764         gf = remote_gf;
 765         goto repeat_fid2path;
 766
 767 out_fid2path:
 768         if (remote_gf != NULL)
 769                 OBD_FREE(remote_gf, remote_gf_size);
 770         RETURN(rc);
 771 }
 772
 773 static int lmv_hsm_req_count(struct lmv_obd *lmv,
 774                              const struct hsm_user_request *hur,
 775                              const struct lmv_tgt_desc *tgt_mds)
 776 {
 777         __u32                    i;
 778         int                      nr = 0;
 779         struct lmv_tgt_desc     *curr_tgt;
 780
 781         /* count how many requests must be sent to the given target */
 782         for (i = 0; i < hur->hur_request.hr_itemcount; i++) {
 783                 curr_tgt = lmv_find_target(lmv, &hur->hur_user_item[i].hui_fid);
 784                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid))
 785                         nr++;
 786         }
 787         return nr;
 788 }
 789
 790 static void lmv_hsm_req_build(struct lmv_obd *lmv,
 791                               struct hsm_user_request *hur_in,
 792                               const struct lmv_tgt_desc *tgt_mds,
 793                               struct hsm_user_request *hur_out)
 794 {
 795         __u32                    i, nr_out;
 796         struct lmv_tgt_desc     *curr_tgt;
 797
 798         /* build the hsm_user_request for the given target */
 799         hur_out->hur_request = hur_in->hur_request;
 800         nr_out = 0;
 801         for (i = 0; i < hur_in->hur_request.hr_itemcount; i++) {
 802                 curr_tgt = lmv_find_target(lmv,
 803                                            &hur_in->hur_user_item[i].hui_fid);
 804                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid)) {
 805                         hur_out->hur_user_item[nr_out] =
 806                                                 hur_in->hur_user_item[i];
 807                         nr_out++;
 808                 }
 809         }
 810         hur_out->hur_request.hr_itemcount = nr_out;
 811         memcpy(hur_data(hur_out), hur_data(hur_in),
 812                hur_in->hur_request.hr_data_len);
 813 }
 814
 815 static int lmv_hsm_ct_unregister(struct lmv_obd *lmv, unsigned int cmd, int len,
 816                                  struct lustre_kernelcomm *lk, void *uarg)
 817 {
 818         __u32                    i;
 819         int                      rc;
 820         struct kkuc_ct_data     *kcd = NULL;
 821         ENTRY;
 822
 823         /* unregister request (call from llapi_hsm_copytool_fini) */
 824         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 825                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 826
 827                 if (tgt == NULL || tgt->ltd_exp == NULL)
 828                         continue;
 829                 /* best effort: try to clean as much as possible
 830                  * (continue on error) */
 831                 obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
 832         }
 833
 834         /* Whatever the result, remove copytool from kuc groups.
 835          * Unreached coordinators will get EPIPE on next requests
 836          * and will unregister automatically.
 837          */
 838         rc = libcfs_kkuc_group_rem(lk->lk_uid, lk->lk_group, (void **)&kcd);
 839         if (kcd != NULL)
 840                 OBD_FREE_PTR(kcd);
 841
 842         RETURN(rc);
 843 }
 844
 845 static int lmv_hsm_ct_register(struct lmv_obd *lmv, unsigned int cmd, int len,
 846                                struct lustre_kernelcomm *lk, void *uarg)
 847 {
 848         struct file             *filp;
 849         __u32                    i, j;
 850         int                      err, rc;
 851         bool                     any_set = false;
 852         struct kkuc_ct_data     *kcd;
 853         ENTRY;
 854
 855         /* All or nothing: try to register to all MDS.
 856          * In case of failure, unregister from previous MDS,
 857          * except if it because of inactive target. */
 858         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 859                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 860
 861                 if (tgt == NULL || tgt->ltd_exp == NULL)
 862                         continue;
 863                 err = obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
 864                 if (err) {
 865                         if (tgt->ltd_active) {
 866                                 /* permanent error */
 867                                 CERROR("%s: iocontrol MDC %s on MDT"
 868                                        " idx %d cmd %x: err = %d\n",
 869                                        class_exp2obd(lmv->exp)->obd_name,
 870                                        tgt->ltd_uuid.uuid, i, cmd, err);
 871                                 rc = err;
 872                                 lk->lk_flags |= LK_FLG_STOP;
 873                                 /* unregister from previous MDS */
 874                                 for (j = 0; j < i; j++) {
 875                                         tgt = lmv->tgts[j];
 876                                         if (tgt == NULL || tgt->ltd_exp == NULL)
 877                                                 continue;
 878                                         obd_iocontrol(cmd, tgt->ltd_exp, len,
 879                                                       lk, uarg);
 880                                 }
 881                                 RETURN(rc);
 882                         }
 883                         /* else: transient error.
 884                          * kuc will register to the missing MDT
 885                          * when it is back */
 886                 } else {
 887                         any_set = true;
 888                 }
 889         }
 890
 891         if (!any_set)
 892                 /* no registration done: return error */
 893                 RETURN(-ENOTCONN);
 894
 895         /* at least one registration done, with no failure */
 896         filp = fget(lk->lk_wfd);
 897         if (filp == NULL)
 898                 RETURN(-EBADF);
 899
 900         OBD_ALLOC_PTR(kcd);
 901         if (kcd == NULL) {
 902                 fput(filp);
 903                 RETURN(-ENOMEM);
 904         }
 905         kcd->kcd_magic = KKUC_CT_DATA_MAGIC;
 906         kcd->kcd_uuid = lmv->cluuid;
 907         kcd->kcd_archive = lk->lk_data;
 908
 909         rc = libcfs_kkuc_group_add(filp, lk->lk_uid, lk->lk_group, kcd);
 910         if (rc != 0) {
 911                 if (filp != NULL)
 912                         fput(filp);
 913                 OBD_FREE_PTR(kcd);
 914         }
 915
 916         RETURN(rc);
 917 }
 918
 919
 920
 921
 922 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
 923                          int len, void *karg, void *uarg)
 924 {
 925         struct obd_device       *obddev = class_exp2obd(exp);
 926         struct lmv_obd          *lmv = &obddev->u.lmv;
 927         struct lmv_tgt_desc     *tgt = NULL;
 928         __u32                    i = 0;
 929         int                      rc = 0;
 930         int                      set = 0;
 931         __u32                    count = lmv->desc.ld_tgt_count;
 932         ENTRY;
 933
 934         if (count == 0)
 935                 RETURN(-ENOTTY);
 936
 937         switch (cmd) {
 938         case IOC_OBD_STATFS: {
 939                 struct obd_ioctl_data *data = karg;
 940                 struct obd_device *mdc_obd;
 941                 struct obd_statfs stat_buf = {0};
 942                 __u32 index;
 943
 944                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
 945                 if ((index >= count))
 946                         RETURN(-ENODEV);
 947
 948                 tgt = lmv->tgts[index];
 949                 if (tgt == NULL || !tgt->ltd_active)
 950                         RETURN(-ENODATA);
 951
 952                 mdc_obd = class_exp2obd(tgt->ltd_exp);
 953                 if (!mdc_obd)
 954                         RETURN(-EINVAL);
 955
 956                 /* copy UUID */
 957                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(mdc_obd),
 958                                  min((int) data->ioc_plen2,
 959                                      (int) sizeof(struct obd_uuid))))
 960                         RETURN(-EFAULT);
 961
 962                 rc = obd_statfs(NULL, tgt->ltd_exp, &stat_buf,
 963                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 964                                 0);
 965                 if (rc)
 966                         RETURN(rc);
 967                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
 968                                  min((int) data->ioc_plen1,
 969                                      (int) sizeof(stat_buf))))
 970                         RETURN(-EFAULT);
 971                 break;
 972         }
 973         case OBD_IOC_QUOTACTL: {
 974                 struct if_quotactl *qctl = karg;
 975                 struct obd_quotactl *oqctl;
 976
 977                 if (qctl->qc_valid == QC_MDTIDX) {
 978                         if (count <= qctl->qc_idx)
 979                                 RETURN(-EINVAL);
 980
 981                         tgt = lmv->tgts[qctl->qc_idx];
 982                         if (tgt == NULL || tgt->ltd_exp == NULL)
 983                                 RETURN(-EINVAL);
 984                 } else if (qctl->qc_valid == QC_UUID) {
 985                         for (i = 0; i < count; i++) {
 986                                 tgt = lmv->tgts[i];
 987                                 if (tgt == NULL)
 988                                         continue;
 989                                 if (!obd_uuid_equals(&tgt->ltd_uuid,
 990                                                      &qctl->obd_uuid))
 991                                         continue;
 992
 993                                 if (tgt->ltd_exp == NULL)
 994                                         RETURN(-EINVAL);
 995
 996                                 break;
 997                         }
 998                 } else {
 999                         RETURN(-EINVAL);
1000                 }
1001
1002                 if (i >= count)
1003                         RETURN(-EAGAIN);
1004
1005                 LASSERT(tgt != NULL && tgt->ltd_exp != NULL);
1006                 OBD_ALLOC_PTR(oqctl);
1007                 if (!oqctl)
1008                         RETURN(-ENOMEM);
1009
1010                 QCTL_COPY(oqctl, qctl);
1011                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
1012                 if (rc == 0) {
1013                         QCTL_COPY(qctl, oqctl);
1014                         qctl->qc_valid = QC_MDTIDX;
1015                         qctl->obd_uuid = tgt->ltd_uuid;
1016                 }
1017                 OBD_FREE_PTR(oqctl);
1018                 break;
1019         }
1020         case OBD_IOC_CHANGELOG_SEND:
1021         case OBD_IOC_CHANGELOG_CLEAR: {
1022                 struct ioc_changelog *icc = karg;
1023
1024                 if (icc->icc_mdtindex >= count)
1025                         RETURN(-ENODEV);
1026
1027                 tgt = lmv->tgts[icc->icc_mdtindex];
1028                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
1029                         RETURN(-ENODEV);
1030                 rc = obd_iocontrol(cmd, tgt->ltd_exp, sizeof(*icc), icc, NULL);
1031                 break;
1032         }
1033         case LL_IOC_GET_CONNECT_FLAGS: {
1034                 tgt = lmv->tgts[0];
1035                 if (tgt == NULL || tgt->ltd_exp == NULL)
1036                         RETURN(-ENODATA);
1037                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1038                 break;
1039         }
1040         case LL_IOC_FID2MDTIDX: {
1041                 struct lu_fid *fid = karg;
1042                 int             mdt_index;
1043
1044                 rc = lmv_fld_lookup(lmv, fid, &mdt_index);
1045                 if (rc != 0)
1046                         RETURN(rc);
1047
1048                 /* Note: this is from llite(see ll_dir_ioctl()), @uarg does not
1049                  * point to user space memory for FID2MDTIDX. */
1050                 *(__u32 *)uarg = mdt_index;
1051                 break;
1052         }
1053         case OBD_IOC_FID2PATH: {
1054                 rc = lmv_fid2path(exp, len, karg, uarg);
1055                 break;
1056         }
1057         case LL_IOC_HSM_STATE_GET:
1058         case LL_IOC_HSM_STATE_SET:
1059         case LL_IOC_HSM_ACTION: {
1060                 struct md_op_data       *op_data = karg;
1061
1062                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
1063                 if (IS_ERR(tgt))
1064                         RETURN(PTR_ERR(tgt));
1065
1066                 if (tgt->ltd_exp == NULL)
1067                         RETURN(-EINVAL);
1068
1069                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1070                 break;
1071         }
1072         case LL_IOC_HSM_PROGRESS: {
1073                 const struct hsm_progress_kernel *hpk = karg;
1074
1075                 tgt = lmv_find_target(lmv, &hpk->hpk_fid);
1076                 if (IS_ERR(tgt))
1077                         RETURN(PTR_ERR(tgt));
1078                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1079                 break;
1080         }
1081         case LL_IOC_HSM_REQUEST: {
1082                 struct hsm_user_request *hur = karg;
1083                 unsigned int reqcount = hur->hur_request.hr_itemcount;
1084
1085                 if (reqcount == 0)
1086                         RETURN(0);
1087
1088                 /* if the request is about a single fid
1089                  * or if there is a single MDS, no need to split
1090                  * the request. */
1091                 if (reqcount == 1 || count == 1) {
1092                         tgt = lmv_find_target(lmv,
1093                                               &hur->hur_user_item[0].hui_fid);
1094                         if (IS_ERR(tgt))
1095                                 RETURN(PTR_ERR(tgt));
1096                         rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1097                 } else {
1098                         /* split fid list to their respective MDS */
1099                         for (i = 0; i < count; i++) {
1100                                 unsigned int            nr, reqlen;
1101                                 int                     rc1;
1102                                 struct hsm_user_request *req;
1103
1104                                 tgt = lmv->tgts[i];
1105                                 if (tgt == NULL || tgt->ltd_exp == NULL)
1106                                         continue;
1107
1108                                 nr = lmv_hsm_req_count(lmv, hur, tgt);
1109                                 if (nr == 0) /* nothing for this MDS */
1110                                         continue;
1111
1112                                 /* build a request with fids for this MDS */
1113                                 reqlen = offsetof(typeof(*hur),
1114                                                   hur_user_item[nr])
1115                                                 + hur->hur_request.hr_data_len;
1116                                 OBD_ALLOC_LARGE(req, reqlen);
1117                                 if (req == NULL)
1118                                         RETURN(-ENOMEM);
1119
1120                                 lmv_hsm_req_build(lmv, hur, tgt, req);
1121
1122                                 rc1 = obd_iocontrol(cmd, tgt->ltd_exp, reqlen,
1123                                                     req, uarg);
1124                                 if (rc1 != 0 && rc == 0)
1125                                         rc = rc1;
1126                                 OBD_FREE_LARGE(req, reqlen);
1127                         }
1128                 }
1129                 break;
1130         }
1131         case LL_IOC_LOV_SWAP_LAYOUTS: {
1132                 struct md_op_data       *op_data = karg;
1133                 struct lmv_tgt_desc     *tgt1, *tgt2;
1134
1135                 tgt1 = lmv_find_target(lmv, &op_data->op_fid1);
1136                 if (IS_ERR(tgt1))
1137                         RETURN(PTR_ERR(tgt1));
1138
1139                 tgt2 = lmv_find_target(lmv, &op_data->op_fid2);
1140                 if (IS_ERR(tgt2))
1141                         RETURN(PTR_ERR(tgt2));
1142
1143                 if ((tgt1->ltd_exp == NULL) || (tgt2->ltd_exp == NULL))
1144                         RETURN(-EINVAL);
1145
1146                 /* only files on same MDT can have their layouts swapped */
1147                 if (tgt1->ltd_idx != tgt2->ltd_idx)
1148                         RETURN(-EPERM);
1149
1150                 rc = obd_iocontrol(cmd, tgt1->ltd_exp, len, karg, uarg);
1151                 break;
1152         }
1153         case LL_IOC_HSM_CT_START: {
1154                 struct lustre_kernelcomm *lk = karg;
1155                 if (lk->lk_flags & LK_FLG_STOP)
1156                         rc = lmv_hsm_ct_unregister(lmv, cmd, len, lk, uarg);
1157                 else
1158                         rc = lmv_hsm_ct_register(lmv, cmd, len, lk, uarg);
1159                 break;
1160         }
1161         default:
1162                 for (i = 0; i < count; i++) {
1163                         struct obd_device *mdc_obd;
1164                         int err;
1165
1166                         tgt = lmv->tgts[i];
1167                         if (tgt == NULL || tgt->ltd_exp == NULL)
1168                                 continue;
1169                         /* ll_umount_begin() sets force flag but for lmv, not
1170                          * mdc. Let's pass it through */
1171                         mdc_obd = class_exp2obd(tgt->ltd_exp);
1172                         mdc_obd->obd_force = obddev->obd_force;
1173                         err = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1174                         if (err == -ENODATA && cmd == OBD_IOC_POLL_QUOTACHECK) {
1175                                 RETURN(err);
1176                         } else if (err) {
1177                                 if (tgt->ltd_active) {
1178                                         CERROR("error: iocontrol MDC %s on MDT"
1179                                                " idx %d cmd %x: err = %d\n",
1180                                                tgt->ltd_uuid.uuid, i, cmd, err);
1181                                         if (!rc)
1182                                                 rc = err;
1183                                 }
1184                         } else
1185                                 set = 1;
1186                 }
1187                 if (!set && !rc)
1188                         rc = -EIO;
1189         }
1190         RETURN(rc);
1191 }
1192
1193 #if 0
1194 static int lmv_all_chars_policy(int count, const char *name,
1195                                 int len)
1196 {
1197         unsigned int c = 0;
1198
1199         while (len > 0)
1200                 c += name[--len];
1201         c = c % count;
1202         return c;
1203 }
1204
1205 static int lmv_nid_policy(struct lmv_obd *lmv)
1206 {
1207         struct obd_import *imp;
1208         __u32              id;
1209
1210         /*
1211          * XXX: To get nid we assume that underlying obd device is mdc.
1212          */
1213         imp = class_exp2cliimp(lmv->tgts[0].ltd_exp);
1214         id = imp->imp_connection->c_self ^ (imp->imp_connection->c_self >> 32);
1215         return id % lmv->desc.ld_tgt_count;
1216 }
1217
1218 static int lmv_choose_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
1219                           placement_policy_t placement)
1220 {
1221         switch (placement) {
1222         case PLACEMENT_CHAR_POLICY:
1223                 return lmv_all_chars_policy(lmv->desc.ld_tgt_count,
1224                                             op_data->op_name,
1225                                             op_data->op_namelen);
1226         case PLACEMENT_NID_POLICY:
1227                 return lmv_nid_policy(lmv);
1228
1229         default:
1230                 break;
1231         }
1232
1233         CERROR("Unsupported placement policy %x\n", placement);
1234         return -EINVAL;
1235 }
1236 #endif
1237
1238 /**
1239  * This is _inode_ placement policy function (not name).
1240  */
1241 static int lmv_placement_policy(struct obd_device *obd,
1242                                 struct md_op_data *op_data, u32 *mds)
1243 {
1244         struct lmv_obd          *lmv = &obd->u.lmv;
1245         ENTRY;
1246
1247         LASSERT(mds != NULL);
1248
1249         if (lmv->desc.ld_tgt_count == 1) {
1250                 *mds = 0;
1251                 RETURN(0);
1252         }
1253
1254         if (op_data->op_default_stripe_offset != -1) {
1255                 *mds = op_data->op_default_stripe_offset;
1256                 RETURN(0);
1257         }
1258
1259         /**
1260          * If stripe_offset is provided during setdirstripe
1261          * (setdirstripe -i xx), xx MDS will be choosen.
1262          */
1263         if (op_data->op_cli_flags & CLI_SET_MEA && op_data->op_data != NULL) {
1264                 struct lmv_user_md *lum;
1265
1266                 lum = op_data->op_data;
1267
1268                 if (le32_to_cpu(lum->lum_stripe_offset) != (__u32)-1) {
1269                         *mds = le32_to_cpu(lum->lum_stripe_offset);
1270                 } else {
1271                         /* -1 means default, which will be in the same MDT with
1272                          * the stripe */
1273                         *mds = op_data->op_mds;
1274                         lum->lum_stripe_offset = cpu_to_le32(op_data->op_mds);
1275                 }
1276         } else {
1277                 /* Allocate new fid on target according to operation type and
1278                  * parent home mds. */
1279                 *mds = op_data->op_mds;
1280         }
1281
1282         RETURN(0);
1283 }
1284
1285 int __lmv_fid_alloc(struct lmv_obd *lmv, struct lu_fid *fid, u32 mds)
1286 {
1287         struct lmv_tgt_desc     *tgt;
1288         int                      rc;
1289         ENTRY;
1290
1291         tgt = lmv_get_target(lmv, mds, NULL);
1292         if (IS_ERR(tgt))
1293                 RETURN(PTR_ERR(tgt));
1294
1295         /*
1296          * New seq alloc and FLD setup should be atomic. Otherwise we may find
1297          * on server that seq in new allocated fid is not yet known.
1298          */
1299         mutex_lock(&tgt->ltd_fid_mutex);
1300
1301         if (tgt->ltd_active == 0 || tgt->ltd_exp == NULL)
1302                 GOTO(out, rc = -ENODEV);
1303
1304         /*
1305          * Asking underlying tgt layer to allocate new fid.
1306          */
1307         rc = obd_fid_alloc(NULL, tgt->ltd_exp, fid, NULL);
1308         if (rc > 0) {
1309                 LASSERT(fid_is_sane(fid));
1310                 rc = 0;
1311         }
1312
1313         EXIT;
1314 out:
1315         mutex_unlock(&tgt->ltd_fid_mutex);
1316         return rc;
1317 }
1318
1319 int lmv_fid_alloc(const struct lu_env *env, struct obd_export *exp,
1320                   struct lu_fid *fid, struct md_op_data *op_data)
1321 {
1322         struct obd_device     *obd = class_exp2obd(exp);
1323         struct lmv_obd        *lmv = &obd->u.lmv;
1324         u32                    mds = 0;
1325         int                    rc;
1326         ENTRY;
1327
1328         LASSERT(op_data != NULL);
1329         LASSERT(fid != NULL);
1330
1331         rc = lmv_placement_policy(obd, op_data, &mds);
1332         if (rc) {
1333                 CERROR("Can't get target for allocating fid, "
1334                        "rc %d\n", rc);
1335                 RETURN(rc);
1336         }
1337
1338         rc = __lmv_fid_alloc(lmv, fid, mds);
1339         if (rc) {
1340                 CERROR("Can't alloc new fid, rc %d\n", rc);
1341                 RETURN(rc);
1342         }
1343
1344         RETURN(rc);
1345 }
1346
1347 static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
1348 {
1349         struct lmv_obd  *lmv = &obd->u.lmv;
1350         struct lmv_desc *desc;
1351         int             rc;
1352         ENTRY;
1353
1354         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1355                 CERROR("LMV setup requires a descriptor\n");
1356                 RETURN(-EINVAL);
1357         }
1358
1359         desc = (struct lmv_desc *)lustre_cfg_buf(lcfg, 1);
1360         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1361                 CERROR("Lmv descriptor size wrong: %d > %d\n",
1362                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1363                 RETURN(-EINVAL);
1364         }
1365
1366         lmv->tgts_size = 32U;
1367         OBD_ALLOC(lmv->tgts, sizeof(*lmv->tgts) * lmv->tgts_size);
1368         if (lmv->tgts == NULL)
1369                 RETURN(-ENOMEM);
1370
1371         obd_str2uuid(&lmv->desc.ld_uuid, desc->ld_uuid.uuid);
1372         lmv->desc.ld_tgt_count = 0;
1373         lmv->desc.ld_active_tgt_count = 0;
1374         lmv->max_cookiesize = 0;
1375         lmv->max_def_easize = 0;
1376         lmv->max_easize = 0;
1377         lmv->lmv_placement = PLACEMENT_CHAR_POLICY;
1378
1379         spin_lock_init(&lmv->lmv_lock);
1380         mutex_init(&lmv->lmv_init_mutex);
1381
1382 #ifdef CONFIG_PROC_FS
1383         obd->obd_vars = lprocfs_lmv_obd_vars;
1384         lprocfs_obd_setup(obd);
1385         lprocfs_alloc_md_stats(obd, 0);
1386         rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
1387                                 0444, &lmv_proc_target_fops, obd);
1388         if (rc)
1389                 CWARN("%s: error adding LMV target_obd file: rc = %d\n",
1390                       obd->obd_name, rc);
1391 #endif
1392         rc = fld_client_init(&lmv->lmv_fld, obd->obd_name,
1393                              LUSTRE_CLI_FLD_HASH_DHT);
1394         if (rc) {
1395                 CERROR("Can't init FLD, err %d\n", rc);
1396                 GOTO(out, rc);
1397         }
1398
1399         RETURN(0);
1400
1401 out:
1402         return rc;
1403 }
1404
1405 static int lmv_cleanup(struct obd_device *obd)
1406 {
1407         struct lmv_obd   *lmv = &obd->u.lmv;
1408         ENTRY;
1409
1410         fld_client_fini(&lmv->lmv_fld);
1411         if (lmv->tgts != NULL) {
1412                 int i;
1413                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1414                         if (lmv->tgts[i] == NULL)
1415                                 continue;
1416                         lmv_del_target(lmv, i);
1417                 }
1418                 OBD_FREE(lmv->tgts, sizeof(*lmv->tgts) * lmv->tgts_size);
1419                 lmv->tgts_size = 0;
1420         }
1421         RETURN(0);
1422 }
1423
1424 static int lmv_process_config(struct obd_device *obd, size_t len, void *buf)
1425 {
1426         struct lustre_cfg       *lcfg = buf;
1427         struct obd_uuid         obd_uuid;
1428         int                     gen;
1429         __u32                   index;
1430         int                     rc;
1431         ENTRY;
1432
1433         switch (lcfg->lcfg_command) {
1434         case LCFG_ADD_MDC:
1435                 /* modify_mdc_tgts add 0:lustre-clilmv  1:lustre-MDT0000_UUID
1436                  * 2:0  3:1  4:lustre-MDT0000-mdc_UUID */
1437                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
1438                         GOTO(out, rc = -EINVAL);
1439
1440                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
1441
1442                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%u", &index) != 1)
1443                         GOTO(out, rc = -EINVAL);
1444                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", &gen) != 1)
1445                         GOTO(out, rc = -EINVAL);
1446                 rc = lmv_add_target(obd, &obd_uuid, index, gen);
1447                 GOTO(out, rc);
1448         default:
1449                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1450                 GOTO(out, rc = -EINVAL);
1451         }
1452 out:
1453         RETURN(rc);
1454 }
1455
1456 static int lmv_statfs(const struct lu_env *env, struct obd_export *exp,
1457                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
1458 {
1459         struct obd_device       *obd = class_exp2obd(exp);
1460         struct lmv_obd          *lmv = &obd->u.lmv;
1461         struct obd_statfs       *temp;
1462         int                      rc = 0;
1463         __u32                    i;
1464         ENTRY;
1465
1466         rc = lmv_check_connect(obd);
1467         if (rc)
1468                 RETURN(rc);
1469
1470         OBD_ALLOC(temp, sizeof(*temp));
1471         if (temp == NULL)
1472                 RETURN(-ENOMEM);
1473
1474         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1475                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1476                         continue;
1477
1478                 rc = obd_statfs(env, lmv->tgts[i]->ltd_exp, temp,
1479                                 max_age, flags);
1480                 if (rc) {
1481                         CERROR("can't stat MDS #%d (%s), error %d\n", i,
1482                                lmv->tgts[i]->ltd_exp->exp_obd->obd_name,
1483                                rc);
1484                         GOTO(out_free_temp, rc);
1485                 }
1486
1487                 if (i == 0) {
1488                         *osfs = *temp;
1489                         /* If the statfs is from mount, it will needs
1490                          * retrieve necessary information from MDT0.
1491                          * i.e. mount does not need the merged osfs
1492                          * from all of MDT.
1493                          * And also clients can be mounted as long as
1494                          * MDT0 is in service*/
1495                         if (flags & OBD_STATFS_FOR_MDT0)
1496                                 GOTO(out_free_temp, rc);
1497                 } else {
1498                         osfs->os_bavail += temp->os_bavail;
1499                         osfs->os_blocks += temp->os_blocks;
1500                         osfs->os_ffree += temp->os_ffree;
1501                         osfs->os_files += temp->os_files;
1502                 }
1503         }
1504
1505         EXIT;
1506 out_free_temp:
1507         OBD_FREE(temp, sizeof(*temp));
1508         return rc;
1509 }
1510
1511 static int lmv_getstatus(struct obd_export *exp,
1512                          struct lu_fid *fid,
1513                          struct obd_capa **pc)
1514 {
1515         struct obd_device    *obd = exp->exp_obd;
1516         struct lmv_obd       *lmv = &obd->u.lmv;
1517         int                   rc;
1518         ENTRY;
1519
1520         rc = lmv_check_connect(obd);
1521         if (rc)
1522                 RETURN(rc);
1523
1524         rc = md_getstatus(lmv->tgts[0]->ltd_exp, fid, pc);
1525         RETURN(rc);
1526 }
1527
1528 static int lmv_getxattr(struct obd_export *exp, const struct lu_fid *fid,
1529                         struct obd_capa *oc, u64 valid, const char *name,
1530                         const char *input, int input_size, int output_size,
1531                         int flags, struct ptlrpc_request **request)
1532 {
1533         struct obd_device      *obd = exp->exp_obd;
1534         struct lmv_obd         *lmv = &obd->u.lmv;
1535         struct lmv_tgt_desc    *tgt;
1536         int                     rc;
1537         ENTRY;
1538
1539         rc = lmv_check_connect(obd);
1540         if (rc)
1541                 RETURN(rc);
1542
1543         tgt = lmv_find_target(lmv, fid);
1544         if (IS_ERR(tgt))
1545                 RETURN(PTR_ERR(tgt));
1546
1547         rc = md_getxattr(tgt->ltd_exp, fid, oc, valid, name, input,
1548                          input_size, output_size, flags, request);
1549
1550         RETURN(rc);
1551 }
1552
1553 static int lmv_setxattr(struct obd_export *exp, const struct lu_fid *fid,
1554                         struct obd_capa *oc, u64 valid, const char *name,
1555                         const char *input, int input_size, int output_size,
1556                         int flags, __u32 suppgid,
1557                         struct ptlrpc_request **request)
1558 {
1559         struct obd_device      *obd = exp->exp_obd;
1560         struct lmv_obd         *lmv = &obd->u.lmv;
1561         struct lmv_tgt_desc    *tgt;
1562         int                     rc;
1563         ENTRY;
1564
1565         rc = lmv_check_connect(obd);
1566         if (rc)
1567                 RETURN(rc);
1568
1569         tgt = lmv_find_target(lmv, fid);
1570         if (IS_ERR(tgt))
1571                 RETURN(PTR_ERR(tgt));
1572
1573         rc = md_setxattr(tgt->ltd_exp, fid, oc, valid, name, input,
1574                          input_size, output_size, flags, suppgid,
1575                          request);
1576
1577         RETURN(rc);
1578 }
1579
1580 static int lmv_getattr(struct obd_export *exp, struct md_op_data *op_data,
1581                        struct ptlrpc_request **request)
1582 {
1583         struct obd_device       *obd = exp->exp_obd;
1584         struct lmv_obd          *lmv = &obd->u.lmv;
1585         struct lmv_tgt_desc     *tgt;
1586         int                      rc;
1587         ENTRY;
1588
1589         rc = lmv_check_connect(obd);
1590         if (rc)
1591                 RETURN(rc);
1592
1593         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1594         if (IS_ERR(tgt))
1595                 RETURN(PTR_ERR(tgt));
1596
1597         if (op_data->op_flags & MF_GET_MDT_IDX) {
1598                 op_data->op_mds = tgt->ltd_idx;
1599                 RETURN(0);
1600         }
1601
1602         rc = md_getattr(tgt->ltd_exp, op_data, request);
1603
1604         RETURN(rc);
1605 }
1606
1607 static int lmv_null_inode(struct obd_export *exp, const struct lu_fid *fid)
1608 {
1609         struct obd_device   *obd = exp->exp_obd;
1610         struct lmv_obd      *lmv = &obd->u.lmv;
1611         __u32                i;
1612         int                  rc;
1613         ENTRY;
1614
1615         rc = lmv_check_connect(obd);
1616         if (rc)
1617                 RETURN(rc);
1618
1619         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1620
1621         /*
1622          * With DNE every object can have two locks in different namespaces:
1623          * lookup lock in space of MDT storing direntry and update/open lock in
1624          * space of MDT storing inode.
1625          */
1626         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1627                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1628                         continue;
1629                 md_null_inode(lmv->tgts[i]->ltd_exp, fid);
1630         }
1631
1632         RETURN(0);
1633 }
1634
1635 static int lmv_find_cbdata(struct obd_export *exp, const struct lu_fid *fid,
1636                            ldlm_iterator_t it, void *data)
1637 {
1638         struct obd_device       *obd = exp->exp_obd;
1639         struct lmv_obd          *lmv = &obd->u.lmv;
1640         int                     i;
1641         int                     tgt;
1642         int                     rc;
1643         ENTRY;
1644
1645         rc = lmv_check_connect(obd);
1646         if (rc)
1647                 RETURN(rc);
1648
1649         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1650
1651         /*
1652          * With DNE every object can have two locks in different namespaces:
1653          * lookup lock in space of MDT storing direntry and update/open lock in
1654          * space of MDT storing inode.  Try the MDT that the FID maps to first,
1655          * since this can be easily found, and only try others if that fails.
1656          */
1657         for (i = 0, tgt = lmv_find_target_index(lmv, fid);
1658              i < lmv->desc.ld_tgt_count;
1659              i++, tgt = (tgt + 1) % lmv->desc.ld_tgt_count) {
1660                 if (tgt < 0) {
1661                         CDEBUG(D_HA, "%s: "DFID" is inaccessible: rc = %d\n",
1662                                obd->obd_name, PFID(fid), tgt);
1663                         tgt = 0;
1664                 }
1665
1666                 if (lmv->tgts[tgt] == NULL ||
1667                     lmv->tgts[tgt]->ltd_exp == NULL)
1668                         continue;
1669
1670                 rc = md_find_cbdata(lmv->tgts[tgt]->ltd_exp, fid, it, data);
1671                 if (rc)
1672                         RETURN(rc);
1673         }
1674
1675         RETURN(rc);
1676 }
1677
1678
1679 static int lmv_close(struct obd_export *exp, struct md_op_data *op_data,
1680                      struct md_open_data *mod, struct ptlrpc_request **request)
1681 {
1682         struct obd_device     *obd = exp->exp_obd;
1683         struct lmv_obd        *lmv = &obd->u.lmv;
1684         struct lmv_tgt_desc   *tgt;
1685         int                    rc;
1686         ENTRY;
1687
1688         rc = lmv_check_connect(obd);
1689         if (rc)
1690                 RETURN(rc);
1691
1692         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1693         if (IS_ERR(tgt))
1694                 RETURN(PTR_ERR(tgt));
1695
1696         CDEBUG(D_INODE, "CLOSE "DFID"\n", PFID(&op_data->op_fid1));
1697         rc = md_close(tgt->ltd_exp, op_data, mod, request);
1698         RETURN(rc);
1699 }
1700
1701 /**
1702  * Choosing the MDT by name or FID in @op_data.
1703  * For non-striped directory, it will locate MDT by fid.
1704  * For striped-directory, it will locate MDT by name. And also
1705  * it will reset op_fid1 with the FID of the choosen stripe.
1706  **/
1707 struct lmv_tgt_desc *
1708 lmv_locate_target_for_name(struct lmv_obd *lmv, struct lmv_stripe_md *lsm,
1709                            const char *name, int namelen, struct lu_fid *fid,
1710                            u32 *mds)
1711 {
1712         struct lmv_tgt_desc     *tgt;
1713         const struct lmv_oinfo  *oinfo;
1714
1715         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_NAME_HASH)) {
1716                 if (cfs_fail_val >= lsm->lsm_md_stripe_count)
1717                         RETURN(ERR_PTR(-EBADF));
1718                 oinfo = &lsm->lsm_md_oinfo[cfs_fail_val];
1719         } else {
1720                 oinfo = lsm_name_to_stripe_info(lsm, name, namelen);
1721                 if (IS_ERR(oinfo))
1722                         RETURN(ERR_CAST(oinfo));
1723         }
1724
1725         if (fid != NULL)
1726                 *fid = oinfo->lmo_fid;
1727         if (mds != NULL)
1728                 *mds = oinfo->lmo_mds;
1729
1730         tgt = lmv_get_target(lmv, oinfo->lmo_mds, NULL);
1731
1732         CDEBUG(D_INFO, "locate on mds %u "DFID"\n", oinfo->lmo_mds,
1733                PFID(&oinfo->lmo_fid));
1734         return tgt;
1735 }
1736
1737 /**
1738  * Locate mds by fid or name
1739  *
1740  * For striped directory (lsm != NULL), it will locate the stripe
1741  * by name hash (see lsm_name_to_stripe_info()). Note: if the hash_type
1742  * is unknown, it will return -EBADFD, and lmv_intent_lookup might need
1743  * walk through all of stripes to locate the entry.
1744  *
1745  * For normal direcotry, it will locate MDS by FID directly.
1746  * \param[in] lmv       LMV device
1747  * \param[in] op_data   client MD stack parameters, name, namelen
1748  *                      mds_num etc.
1749  * \param[in] fid       object FID used to locate MDS.
1750  *
1751  * retval               pointer to the lmv_tgt_desc if succeed.
1752  *                      ERR_PTR(errno) if failed.
1753  */
1754 struct lmv_tgt_desc*
1755 lmv_locate_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
1756                struct lu_fid *fid)
1757 {
1758         struct lmv_stripe_md    *lsm = op_data->op_mea1;
1759         struct lmv_tgt_desc     *tgt;
1760
1761         /* During creating VOLATILE file, it should honor the mdt
1762          * index if the file under striped dir is being restored, see
1763          * ct_restore(). */
1764         if (op_data->op_bias & MDS_CREATE_VOLATILE &&
1765             (int)op_data->op_mds != -1 && lsm != NULL) {
1766                 int i;
1767                 tgt = lmv_get_target(lmv, op_data->op_mds, NULL);
1768                 if (IS_ERR(tgt))
1769                         return tgt;
1770
1771                 /* refill the right parent fid */
1772                 for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
1773                         struct lmv_oinfo *oinfo;
1774
1775                         oinfo = &lsm->lsm_md_oinfo[i];
1776                         if (oinfo->lmo_mds == op_data->op_mds) {
1777                                 *fid = oinfo->lmo_fid;
1778                                 break;
1779                         }
1780                 }
1781
1782                 /* Hmm, can not find the stripe by mdt_index(op_mds) */
1783                 if (i == lsm->lsm_md_stripe_count)
1784                         tgt = ERR_PTR(-EINVAL);
1785
1786                 return tgt;
1787         }
1788
1789         if (lsm == NULL || op_data->op_namelen == 0) {
1790                 tgt = lmv_find_target(lmv, fid);
1791                 if (IS_ERR(tgt))
1792                         return tgt;
1793
1794                 op_data->op_mds = tgt->ltd_idx;
1795                 return tgt;
1796         }
1797
1798         return lmv_locate_target_for_name(lmv, lsm, op_data->op_name,
1799                                           op_data->op_namelen, fid,
1800                                           &op_data->op_mds);
1801 }
1802
1803 int lmv_create(struct obd_export *exp, struct md_op_data *op_data,
1804                 const void *data, size_t datalen, umode_t mode, uid_t uid,
1805                 gid_t gid, cfs_cap_t cap_effective, __u64 rdev,
1806                 struct ptlrpc_request **request)
1807 {
1808         struct obd_device       *obd = exp->exp_obd;
1809         struct lmv_obd          *lmv = &obd->u.lmv;
1810         struct lmv_tgt_desc     *tgt;
1811         int                      rc;
1812         ENTRY;
1813
1814         rc = lmv_check_connect(obd);
1815         if (rc)
1816                 RETURN(rc);
1817
1818         if (!lmv->desc.ld_active_tgt_count)
1819                 RETURN(-EIO);
1820
1821         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1822         if (IS_ERR(tgt))
1823                 RETURN(PTR_ERR(tgt));
1824
1825         CDEBUG(D_INODE, "CREATE name '%.*s' on "DFID" -> mds #%x\n",
1826                 (int)op_data->op_namelen, op_data->op_name,
1827                 PFID(&op_data->op_fid1), op_data->op_mds);
1828
1829         rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
1830         if (rc)
1831                 RETURN(rc);
1832         if (exp_connect_flags(exp) & OBD_CONNECT_DIR_STRIPE) {
1833                 /* Send the create request to the MDT where the object
1834                  * will be located */
1835                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
1836                 if (IS_ERR(tgt))
1837                         RETURN(PTR_ERR(tgt));
1838
1839                 op_data->op_mds = tgt->ltd_idx;
1840         } else {
1841                 CDEBUG(D_CONFIG, "Server doesn't support striped dirs\n");
1842         }
1843
1844         CDEBUG(D_INODE, "CREATE obj "DFID" -> mds #%x\n",
1845                PFID(&op_data->op_fid2), op_data->op_mds);
1846
1847         op_data->op_flags |= MF_MDC_CANCEL_FID1;
1848         rc = md_create(tgt->ltd_exp, op_data, data, datalen, mode, uid, gid,
1849                        cap_effective, rdev, request);
1850         if (rc == 0) {
1851                 if (*request == NULL)
1852                         RETURN(rc);
1853                 CDEBUG(D_INODE, "Created - "DFID"\n", PFID(&op_data->op_fid2));
1854         }
1855         RETURN(rc);
1856 }
1857
1858 static int
1859 lmv_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1860             const union ldlm_policy_data *policy,
1861             struct lookup_intent *it, struct md_op_data *op_data,
1862             struct lustre_handle *lockh, __u64 extra_lock_flags)
1863 {
1864         struct obd_device        *obd = exp->exp_obd;
1865         struct lmv_obd           *lmv = &obd->u.lmv;
1866         struct lmv_tgt_desc      *tgt;
1867         int                       rc;
1868         ENTRY;
1869
1870         rc = lmv_check_connect(obd);
1871         if (rc)
1872                 RETURN(rc);
1873
1874         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID"\n",
1875                LL_IT2STR(it), PFID(&op_data->op_fid1));
1876
1877         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1878         if (IS_ERR(tgt))
1879                 RETURN(PTR_ERR(tgt));
1880
1881         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID" -> mds #%u\n",
1882                LL_IT2STR(it), PFID(&op_data->op_fid1), tgt->ltd_idx);
1883
1884         rc = md_enqueue(tgt->ltd_exp, einfo, policy, it, op_data, lockh,
1885                         extra_lock_flags);
1886
1887         RETURN(rc);
1888 }
1889
1890 static int
1891 lmv_getattr_name(struct obd_export *exp,struct md_op_data *op_data,
1892                  struct ptlrpc_request **preq)
1893 {
1894         struct ptlrpc_request   *req = NULL;
1895         struct obd_device       *obd = exp->exp_obd;
1896         struct lmv_obd          *lmv = &obd->u.lmv;
1897         struct lmv_tgt_desc     *tgt;
1898         struct mdt_body         *body;
1899         int                      rc;
1900         ENTRY;
1901
1902         rc = lmv_check_connect(obd);
1903         if (rc)
1904                 RETURN(rc);
1905
1906         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1907         if (IS_ERR(tgt))
1908                 RETURN(PTR_ERR(tgt));
1909
1910         CDEBUG(D_INODE, "GETATTR_NAME for %*s on "DFID" -> mds #%d\n",
1911                 (int)op_data->op_namelen, op_data->op_name,
1912                 PFID(&op_data->op_fid1), tgt->ltd_idx);
1913
1914         rc = md_getattr_name(tgt->ltd_exp, op_data, preq);
1915         if (rc != 0)
1916                 RETURN(rc);
1917
1918         body = req_capsule_server_get(&(*preq)->rq_pill, &RMF_MDT_BODY);
1919         LASSERT(body != NULL);
1920
1921         if (body->mbo_valid & OBD_MD_MDS) {
1922                 struct lu_fid rid = body->mbo_fid1;
1923                 CDEBUG(D_INODE, "Request attrs for "DFID"\n",
1924                        PFID(&rid));
1925
1926                 tgt = lmv_find_target(lmv, &rid);
1927                 if (IS_ERR(tgt)) {
1928                         ptlrpc_req_finished(*preq);
1929                         preq = NULL;
1930                         RETURN(PTR_ERR(tgt));
1931                 }
1932
1933                 op_data->op_fid1 = rid;
1934                 op_data->op_valid |= OBD_MD_FLCROSSREF;
1935                 op_data->op_namelen = 0;
1936                 op_data->op_name = NULL;
1937                 rc = md_getattr_name(tgt->ltd_exp, op_data, &req);
1938                 ptlrpc_req_finished(*preq);
1939                 *preq = req;
1940         }
1941
1942         RETURN(rc);
1943 }
1944
1945 #define md_op_data_fid(op_data, fl)                     \
1946         (fl == MF_MDC_CANCEL_FID1 ? &op_data->op_fid1 : \
1947          fl == MF_MDC_CANCEL_FID2 ? &op_data->op_fid2 : \
1948          fl == MF_MDC_CANCEL_FID3 ? &op_data->op_fid3 : \
1949          fl == MF_MDC_CANCEL_FID4 ? &op_data->op_fid4 : \
1950          NULL)
1951
1952 static int lmv_early_cancel(struct obd_export *exp, struct lmv_tgt_desc *tgt,
1953                             struct md_op_data *op_data,
1954                             __u32 op_tgt, ldlm_mode_t mode, int bits, int flag)
1955 {
1956         struct lu_fid          *fid = md_op_data_fid(op_data, flag);
1957         struct obd_device      *obd = exp->exp_obd;
1958         struct lmv_obd         *lmv = &obd->u.lmv;
1959         ldlm_policy_data_t      policy = {{ 0 }};
1960         int                     rc = 0;
1961         ENTRY;
1962
1963         if (!fid_is_sane(fid))
1964                 RETURN(0);
1965
1966         if (tgt == NULL) {
1967                 tgt = lmv_find_target(lmv, fid);
1968                 if (IS_ERR(tgt))
1969                         RETURN(PTR_ERR(tgt));
1970         }
1971
1972         if (tgt->ltd_idx != op_tgt) {
1973                 CDEBUG(D_INODE, "EARLY_CANCEL on "DFID"\n", PFID(fid));
1974                 policy.l_inodebits.bits = bits;
1975                 rc = md_cancel_unused(tgt->ltd_exp, fid, &policy,
1976                                       mode, LCF_ASYNC, NULL);
1977         } else {
1978                 CDEBUG(D_INODE,
1979                        "EARLY_CANCEL skip operation target %d on "DFID"\n",
1980                        op_tgt, PFID(fid));
1981                 op_data->op_flags |= flag;
1982                 rc = 0;
1983         }
1984
1985         RETURN(rc);
1986 }
1987
1988 /*
1989  * llite passes fid of an target inode in op_data->op_fid1 and id of directory in
1990  * op_data->op_fid2
1991  */
1992 static int lmv_link(struct obd_export *exp, struct md_op_data *op_data,
1993                     struct ptlrpc_request **request)
1994 {
1995         struct obd_device       *obd = exp->exp_obd;
1996         struct lmv_obd          *lmv = &obd->u.lmv;
1997         struct lmv_tgt_desc     *tgt;
1998         int                      rc;
1999         ENTRY;
2000
2001         rc = lmv_check_connect(obd);
2002         if (rc)
2003                 RETURN(rc);
2004
2005         LASSERT(op_data->op_namelen != 0);
2006
2007         CDEBUG(D_INODE, "LINK "DFID":%*s to "DFID"\n",
2008                PFID(&op_data->op_fid2), (int)op_data->op_namelen,
2009                op_data->op_name, PFID(&op_data->op_fid1));
2010
2011         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2012         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2013         op_data->op_cap = cfs_curproc_cap_pack();
2014         if (op_data->op_mea2 != NULL) {
2015                 struct lmv_stripe_md    *lsm = op_data->op_mea2;
2016                 const struct lmv_oinfo  *oinfo;
2017
2018                 oinfo = lsm_name_to_stripe_info(lsm, op_data->op_name,
2019                                                 op_data->op_namelen);
2020                 if (IS_ERR(oinfo))
2021                         RETURN(PTR_ERR(oinfo));
2022
2023                 op_data->op_fid2 = oinfo->lmo_fid;
2024         }
2025
2026         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid2);
2027         if (IS_ERR(tgt))
2028                 RETURN(PTR_ERR(tgt));
2029
2030         /*
2031          * Cancel UPDATE lock on child (fid1).
2032          */
2033         op_data->op_flags |= MF_MDC_CANCEL_FID2;
2034         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_idx, LCK_EX,
2035                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2036         if (rc != 0)
2037                 RETURN(rc);
2038
2039         rc = md_link(tgt->ltd_exp, op_data, request);
2040
2041         RETURN(rc);
2042 }
2043
2044 static int lmv_rename(struct obd_export *exp, struct md_op_data *op_data,
2045                       const char *old, size_t oldlen,
2046                       const char *new, size_t newlen,
2047                       struct ptlrpc_request **request)
2048 {
2049         struct obd_device       *obd = exp->exp_obd;
2050         struct lmv_obd          *lmv = &obd->u.lmv;
2051         struct lmv_tgt_desc     *src_tgt;
2052         int                     rc;
2053         ENTRY;
2054
2055         LASSERT(oldlen != 0);
2056
2057         CDEBUG(D_INODE, "RENAME %.*s in "DFID":%d to %.*s in "DFID":%d\n",
2058                (int)oldlen, old, PFID(&op_data->op_fid1),
2059                op_data->op_mea1 ? op_data->op_mea1->lsm_md_stripe_count : 0,
2060                (int)newlen, new, PFID(&op_data->op_fid2),
2061                op_data->op_mea2 ? op_data->op_mea2->lsm_md_stripe_count : 0);
2062
2063         rc = lmv_check_connect(obd);
2064         if (rc)
2065                 RETURN(rc);
2066
2067         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2068         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2069         op_data->op_cap = cfs_curproc_cap_pack();
2070         if (op_data->op_cli_flags & CLI_MIGRATE) {
2071                 LASSERTF(fid_is_sane(&op_data->op_fid3), "invalid FID "DFID"\n",
2072                          PFID(&op_data->op_fid3));
2073
2074                 if (op_data->op_mea1 != NULL) {
2075                         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2076                         struct lmv_tgt_desc     *tmp;
2077
2078                         /* Fix the parent fid for striped dir */
2079                         tmp = lmv_locate_target_for_name(lmv, lsm, old,
2080                                                          oldlen,
2081                                                          &op_data->op_fid1,
2082                                                          NULL);
2083                         if (IS_ERR(tmp))
2084                                 RETURN(PTR_ERR(tmp));
2085                 }
2086
2087                 rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
2088                 if (rc != 0)
2089                         RETURN(rc);
2090
2091                 src_tgt = lmv_find_target(lmv, &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, struct ptlrpc_request **request)
2183 {
2184         struct obd_device       *obd = exp->exp_obd;
2185         struct lmv_obd          *lmv = &obd->u.lmv;
2186         struct lmv_tgt_desc     *tgt;
2187         int                      rc = 0;
2188         ENTRY;
2189
2190         rc = lmv_check_connect(obd);
2191         if (rc)
2192                 RETURN(rc);
2193
2194         CDEBUG(D_INODE, "SETATTR for "DFID", valid 0x%x\n",
2195                PFID(&op_data->op_fid1), op_data->op_attr.ia_valid);
2196
2197         op_data->op_flags |= MF_MDC_CANCEL_FID1;
2198         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2199         if (IS_ERR(tgt))
2200                 RETURN(PTR_ERR(tgt));
2201
2202         rc = md_setattr(tgt->ltd_exp, op_data, ea, ealen, request);
2203
2204         RETURN(rc);
2205 }
2206
2207 static int lmv_fsync(struct obd_export *exp, const struct lu_fid *fid,
2208                      struct obd_capa *oc, struct ptlrpc_request **request)
2209 {
2210         struct obd_device       *obd = exp->exp_obd;
2211         struct lmv_obd          *lmv = &obd->u.lmv;
2212         struct lmv_tgt_desc     *tgt;
2213         int                      rc;
2214         ENTRY;
2215
2216         rc = lmv_check_connect(obd);
2217         if (rc != 0)
2218                 RETURN(rc);
2219
2220         tgt = lmv_find_target(lmv, fid);
2221         if (IS_ERR(tgt))
2222                 RETURN(PTR_ERR(tgt));
2223
2224         rc = md_fsync(tgt->ltd_exp, fid, oc, request);
2225         RETURN(rc);
2226 }
2227
2228 /**
2229  * Get current minimum entry from striped directory
2230  *
2231  * This function will search the dir entry, whose hash value is the
2232  * closest(>=) to @hash_offset, from all of sub-stripes, and it is
2233  * only being called for striped directory.
2234  *
2235  * \param[in] exp               export of LMV
2236  * \param[in] op_data           parameters transferred beween client MD stack
2237  *                              stripe_information will be included in this
2238  *                              parameter
2239  * \param[in] cb_op             ldlm callback being used in enqueue in
2240  *                              mdc_read_page
2241  * \param[in] hash_offset       the hash value, which is used to locate
2242  *                              minum(closet) dir entry
2243  * \param[in|out] stripe_offset the caller use this to indicate the stripe
2244  *                              index of last entry, so to avoid hash conflict
2245  *                              between stripes. It will also be used to
2246  *                              return the stripe index of current dir entry.
2247  * \param[in|out] entp          the minum entry and it also is being used
2248  *                              to input the last dir entry to resolve the
2249  *                              hash conflict
2250  *
2251  * \param[out] ppage            the page which holds the minum entry
2252  *
2253  * \retval                      = 0 get the entry successfully
2254  *                              negative errno (< 0) does not get the entry
2255  */
2256 static int lmv_get_min_striped_entry(struct obd_export *exp,
2257                                      struct md_op_data *op_data,
2258                                      struct md_callback *cb_op,
2259                                      __u64 hash_offset, int *stripe_offset,
2260                                      struct lu_dirent **entp,
2261                                      struct page **ppage)
2262 {
2263         struct obd_device       *obd = exp->exp_obd;
2264         struct lmv_obd          *lmv = &obd->u.lmv;
2265         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2266         struct lmv_tgt_desc     *tgt;
2267         int                     stripe_count;
2268         struct lu_dirent        *min_ent = NULL;
2269         struct page             *min_page = NULL;
2270         int                     min_idx = 0;
2271         int                     i;
2272         int                     rc = 0;
2273         ENTRY;
2274
2275         stripe_count = lsm->lsm_md_stripe_count;
2276         for (i = 0; i < stripe_count; i++) {
2277                 struct lu_dirent        *ent = NULL;
2278                 struct page             *page = NULL;
2279                 struct lu_dirpage       *dp;
2280                 __u64                   stripe_hash = hash_offset;
2281
2282                 tgt = lmv_get_target(lmv, lsm->lsm_md_oinfo[i].lmo_mds, NULL);
2283                 if (IS_ERR(tgt))
2284                         GOTO(out, rc = PTR_ERR(tgt));
2285
2286                 /* op_data will be shared by each stripe, so we need
2287                  * reset these value for each stripe */
2288                 op_data->op_fid1 = lsm->lsm_md_oinfo[i].lmo_fid;
2289                 op_data->op_fid2 = lsm->lsm_md_oinfo[i].lmo_fid;
2290                 op_data->op_data = lsm->lsm_md_oinfo[i].lmo_root;
2291 next:
2292                 rc = md_read_page(tgt->ltd_exp, op_data, cb_op, stripe_hash,
2293                                   &page);
2294                 if (rc != 0)
2295                         GOTO(out, rc);
2296
2297                 dp = page_address(page);
2298                 for (ent = lu_dirent_start(dp); ent != NULL;
2299                      ent = lu_dirent_next(ent)) {
2300                         /* Skip dummy entry */
2301                         if (le16_to_cpu(ent->lde_namelen) == 0)
2302                                 continue;
2303
2304                         if (le64_to_cpu(ent->lde_hash) < hash_offset)
2305                                 continue;
2306
2307                         if (le64_to_cpu(ent->lde_hash) == hash_offset &&
2308                             (*entp == ent || i < *stripe_offset))
2309                                 continue;
2310
2311                         /* skip . and .. for other stripes */
2312                         if (i != 0 &&
2313                             (strncmp(ent->lde_name, ".",
2314                                      le16_to_cpu(ent->lde_namelen)) == 0 ||
2315                              strncmp(ent->lde_name, "..",
2316                                      le16_to_cpu(ent->lde_namelen)) == 0))
2317                                 continue;
2318                         break;
2319                 }
2320
2321                 if (ent == NULL) {
2322                         stripe_hash = le64_to_cpu(dp->ldp_hash_end);
2323
2324                         kunmap(page);
2325                         page_cache_release(page);
2326                         page = NULL;
2327
2328                         /* reach the end of current stripe, go to next stripe */
2329                         if (stripe_hash == MDS_DIR_END_OFF)
2330                                 continue;
2331                         else
2332                                 goto next;
2333                 }
2334
2335                 if (min_ent != NULL) {
2336                         if (le64_to_cpu(min_ent->lde_hash) >
2337                             le64_to_cpu(ent->lde_hash)) {
2338                                 min_ent = ent;
2339                                 kunmap(min_page);
2340                                 page_cache_release(min_page);
2341                                 min_idx = i;
2342                                 min_page = page;
2343                         } else {
2344                                 kunmap(page);
2345                                 page_cache_release(page);
2346                                 page = NULL;
2347                         }
2348                 } else {
2349                         min_ent = ent;
2350                         min_page = page;
2351                         min_idx = i;
2352                 }
2353         }
2354
2355 out:
2356         if (*ppage != NULL) {
2357                 kunmap(*ppage);
2358                 page_cache_release(*ppage);
2359         }
2360         *stripe_offset = min_idx;
2361         *entp = min_ent;
2362         *ppage = min_page;
2363         RETURN(rc);
2364 }
2365
2366 /**
2367  * Build dir entry page from a striped directory
2368  *
2369  * This function gets one entry by @offset from a striped directory. It will
2370  * read entries from all of stripes, and choose one closest to the required
2371  * offset(&offset). A few notes
2372  * 1. skip . and .. for non-zero stripes, because there can only have one .
2373  * and .. in a directory.
2374  * 2. op_data will be shared by all of stripes, instead of allocating new
2375  * one, so need to restore before reusing.
2376  * 3. release the entry page if that is not being chosen.
2377  *
2378  * \param[in] exp       obd export refer to LMV
2379  * \param[in] op_data   hold those MD parameters of read_entry
2380  * \param[in] cb_op     ldlm callback being used in enqueue in mdc_read_entry
2381  * \param[out] ldp      the entry being read
2382  * \param[out] ppage    the page holding the entry. Note: because the entry
2383  *                      will be accessed in upper layer, so we need hold the
2384  *                      page until the usages of entry is finished, see
2385  *                      ll_dir_entry_next.
2386  *
2387  * retval               =0 if get entry successfully
2388  *                      <0 cannot get entry
2389  */
2390 static int lmv_read_striped_page(struct obd_export *exp,
2391                                  struct md_op_data *op_data,
2392                                  struct md_callback *cb_op,
2393                                  __u64 offset, struct page **ppage)
2394 {
2395         struct obd_device       *obd = exp->exp_obd;
2396         struct lu_fid           master_fid = op_data->op_fid1;
2397         struct inode            *master_inode = op_data->op_data;
2398         __u64                   hash_offset = offset;
2399         struct lu_dirpage       *dp;
2400         struct page             *min_ent_page = NULL;
2401         struct page             *ent_page = NULL;
2402         struct lu_dirent        *ent;
2403         void                    *area;
2404         int                     ent_idx = 0;
2405         struct lu_dirent        *min_ent = NULL;
2406         struct lu_dirent        *last_ent;
2407         size_t                  left_bytes;
2408         int                     rc;
2409         ENTRY;
2410
2411         rc = lmv_check_connect(obd);
2412         if (rc)
2413                 RETURN(rc);
2414
2415         /* Allocate a page and read entries from all of stripes and fill
2416          * the page by hash order */
2417         ent_page = alloc_page(GFP_KERNEL);
2418         if (ent_page == NULL)
2419                 RETURN(-ENOMEM);
2420
2421         /* Initialize the entry page */
2422         dp = kmap(ent_page);
2423         memset(dp, 0, sizeof(*dp));
2424         dp->ldp_hash_start = cpu_to_le64(offset);
2425         dp->ldp_flags |= LDF_COLLIDE;
2426
2427         area = dp + 1;
2428         left_bytes = PAGE_CACHE_SIZE - sizeof(*dp);
2429         ent = area;
2430         last_ent = ent;
2431         do {
2432                 __u16   ent_size;
2433
2434                 /* Find the minum entry from all sub-stripes */
2435                 rc = lmv_get_min_striped_entry(exp, op_data, cb_op, hash_offset,
2436                                                &ent_idx, &min_ent,
2437                                                &min_ent_page);
2438                 if (rc != 0)
2439                         GOTO(out, rc);
2440
2441                 /* If it can not get minum entry, it means it already reaches
2442                  * the end of this directory */
2443                 if (min_ent == NULL) {
2444                         last_ent->lde_reclen = 0;
2445                         hash_offset = MDS_DIR_END_OFF;
2446                         GOTO(out, rc);
2447                 }
2448
2449                 ent_size = le16_to_cpu(min_ent->lde_reclen);
2450
2451                 /* the last entry lde_reclen is 0, but it might not
2452                  * the end of this entry of this temporay entry */
2453                 if (ent_size == 0)
2454                         ent_size = lu_dirent_calc_size(
2455                                         le16_to_cpu(min_ent->lde_namelen),
2456                                         le32_to_cpu(min_ent->lde_attrs));
2457                 if (ent_size > left_bytes) {
2458                         last_ent->lde_reclen = cpu_to_le16(0);
2459                         hash_offset = le64_to_cpu(min_ent->lde_hash);
2460                         GOTO(out, rc);
2461                 }
2462
2463                 memcpy(ent, min_ent, ent_size);
2464
2465                 /* Replace . with master FID and Replace .. with the parent FID
2466                  * of master object */
2467                 if (strncmp(ent->lde_name, ".",
2468                             le16_to_cpu(ent->lde_namelen)) == 0 &&
2469                     le16_to_cpu(ent->lde_namelen) == 1)
2470                         fid_cpu_to_le(&ent->lde_fid, &master_fid);
2471                 else if (strncmp(ent->lde_name, "..",
2472                                    le16_to_cpu(ent->lde_namelen)) == 0 &&
2473                            le16_to_cpu(ent->lde_namelen) == 2)
2474                         fid_cpu_to_le(&ent->lde_fid, &op_data->op_fid3);
2475
2476                 left_bytes -= ent_size;
2477                 ent->lde_reclen = cpu_to_le16(ent_size);
2478                 last_ent = ent;
2479                 ent = (void *)ent + ent_size;
2480                 hash_offset = le64_to_cpu(min_ent->lde_hash);
2481                 if (hash_offset == MDS_DIR_END_OFF) {
2482                         last_ent->lde_reclen = 0;
2483                         break;
2484                 }
2485         } while (1);
2486 out:
2487         if (min_ent_page != NULL) {
2488                 kunmap(min_ent_page);
2489                 page_cache_release(min_ent_page);
2490         }
2491
2492         if (unlikely(rc != 0)) {
2493                 __free_page(ent_page);
2494                 ent_page = NULL;
2495         } else {
2496                 if (ent == area)
2497                         dp->ldp_flags |= LDF_EMPTY;
2498                 dp->ldp_flags = cpu_to_le32(dp->ldp_flags);
2499                 dp->ldp_hash_end = cpu_to_le64(hash_offset);
2500         }
2501
2502         /* We do not want to allocate md_op_data during each
2503          * dir entry reading, so op_data will be shared by every stripe,
2504          * then we need to restore it back to original value before
2505          * return to the upper layer */
2506         op_data->op_fid1 = master_fid;
2507         op_data->op_fid2 = master_fid;
2508         op_data->op_data = master_inode;
2509
2510         *ppage = ent_page;
2511
2512         RETURN(rc);
2513 }
2514
2515 int lmv_read_page(struct obd_export *exp, struct md_op_data *op_data,
2516                   struct md_callback *cb_op, __u64 offset,
2517                   struct page **ppage)
2518 {
2519         struct obd_device       *obd = exp->exp_obd;
2520         struct lmv_obd          *lmv = &obd->u.lmv;
2521         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2522         struct lmv_tgt_desc     *tgt;
2523         int                     rc;
2524         ENTRY;
2525
2526         rc = lmv_check_connect(obd);
2527         if (rc != 0)
2528                 RETURN(rc);
2529
2530         if (unlikely(lsm != NULL)) {
2531                 rc = lmv_read_striped_page(exp, op_data, cb_op, offset, ppage);
2532                 RETURN(rc);
2533         }
2534
2535         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2536         if (IS_ERR(tgt))
2537                 RETURN(PTR_ERR(tgt));
2538
2539         rc = md_read_page(tgt->ltd_exp, op_data, cb_op, offset, ppage);
2540
2541         RETURN(rc);
2542 }
2543
2544 /**
2545  * Unlink a file/directory
2546  *
2547  * Unlink a file or directory under the parent dir. The unlink request
2548  * usually will be sent to the MDT where the child is located, but if
2549  * the client does not have the child FID then request will be sent to the
2550  * MDT where the parent is located.
2551  *
2552  * If the parent is a striped directory then it also needs to locate which
2553  * stripe the name of the child is located, and replace the parent FID
2554  * (@op->op_fid1) with the stripe FID. Note: if the stripe is unknown,
2555  * it will walk through all of sub-stripes until the child is being
2556  * unlinked finally.
2557  *
2558  * \param[in] exp       export refer to LMV
2559  * \param[in] op_data   different parameters transferred beween client
2560  *                      MD stacks, name, namelen, FIDs etc.
2561  *                      op_fid1 is the parent FID, op_fid2 is the child
2562  *                      FID.
2563  * \param[out] request  point to the request of unlink.
2564  *
2565  * retval               0 if succeed
2566  *                      negative errno if failed.
2567  */
2568 static int lmv_unlink(struct obd_export *exp, struct md_op_data *op_data,
2569                       struct ptlrpc_request **request)
2570 {
2571         struct obd_device       *obd = exp->exp_obd;
2572         struct lmv_obd          *lmv = &obd->u.lmv;
2573         struct lmv_tgt_desc     *tgt = NULL;
2574         struct lmv_tgt_desc     *parent_tgt = NULL;
2575         struct mdt_body         *body;
2576         int                     rc;
2577         int                     stripe_index = 0;
2578         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2579         ENTRY;
2580
2581         rc = lmv_check_connect(obd);
2582         if (rc)
2583                 RETURN(rc);
2584 retry_unlink:
2585         /* For striped dir, we need to locate the parent as well */
2586         if (lsm != NULL) {
2587                 struct lmv_tgt_desc *tmp;
2588
2589                 LASSERT(op_data->op_name != NULL &&
2590                         op_data->op_namelen != 0);
2591
2592                 tmp = lmv_locate_target_for_name(lmv, lsm,
2593                                                  op_data->op_name,
2594                                                  op_data->op_namelen,
2595                                                  &op_data->op_fid1,
2596                                                  &op_data->op_mds);
2597
2598                 /* return -EBADFD means unknown hash type, might
2599                  * need try all sub-stripe here */
2600                 if (IS_ERR(tmp) && PTR_ERR(tmp) != -EBADFD)
2601                         RETURN(PTR_ERR(tmp));
2602
2603                 /* Note: both migrating dir and unknown hash dir need to
2604                  * try all of sub-stripes, so we need start search the
2605                  * name from stripe 0, but migrating dir is already handled
2606                  * inside lmv_locate_target_for_name(), so we only check
2607                  * unknown hash type directory here */
2608                 if (!lmv_is_known_hash_type(lsm->lsm_md_hash_type)) {
2609                         struct lmv_oinfo *oinfo;
2610
2611                         oinfo = &lsm->lsm_md_oinfo[stripe_index];
2612
2613                         op_data->op_fid1 = oinfo->lmo_fid;
2614                         op_data->op_mds = oinfo->lmo_mds;
2615                 }
2616         }
2617
2618 try_next_stripe:
2619         /* Send unlink requests to the MDT where the child is located */
2620         if (likely(!fid_is_zero(&op_data->op_fid2)))
2621                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
2622         else if (lsm != NULL)
2623                 tgt = lmv_get_target(lmv, op_data->op_mds, NULL);
2624         else
2625                 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
2626
2627         if (IS_ERR(tgt))
2628                 RETURN(PTR_ERR(tgt));
2629
2630         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2631         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2632         op_data->op_cap = cfs_curproc_cap_pack();
2633
2634         /*
2635          * If child's fid is given, cancel unused locks for it if it is from
2636          * another export than parent.
2637          *
2638          * LOOKUP lock for child (fid3) should also be cancelled on parent
2639          * tgt_tgt in mdc_unlink().
2640          */
2641         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2642
2643         /*
2644          * Cancel FULL locks on child (fid3).
2645          */
2646         parent_tgt = lmv_find_target(lmv, &op_data->op_fid1);
2647         if (IS_ERR(parent_tgt))
2648                 RETURN(PTR_ERR(parent_tgt));
2649
2650         if (parent_tgt != tgt) {
2651                 rc = lmv_early_cancel(exp, parent_tgt, op_data, tgt->ltd_idx,
2652                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2653                                       MF_MDC_CANCEL_FID3);
2654         }
2655
2656         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_idx, LCK_EX,
2657                               MDS_INODELOCK_FULL, MF_MDC_CANCEL_FID3);
2658         if (rc != 0)
2659                 RETURN(rc);
2660
2661         CDEBUG(D_INODE, "unlink with fid="DFID"/"DFID" -> mds #%u\n",
2662                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2), tgt->ltd_idx);
2663
2664         rc = md_unlink(tgt->ltd_exp, op_data, request);
2665         if (rc != 0 && rc != -EREMOTE && rc != -ENOENT)
2666                 RETURN(rc);
2667
2668         /* Try next stripe if it is needed. */
2669         if (rc == -ENOENT && lsm != NULL && lmv_need_try_all_stripes(lsm)) {
2670                 struct lmv_oinfo *oinfo;
2671
2672                 stripe_index++;
2673                 if (stripe_index >= lsm->lsm_md_stripe_count)
2674                         RETURN(rc);
2675
2676                 oinfo = &lsm->lsm_md_oinfo[stripe_index];
2677
2678                 op_data->op_fid1 = oinfo->lmo_fid;
2679                 op_data->op_mds = oinfo->lmo_mds;
2680
2681                 ptlrpc_req_finished(*request);
2682                 *request = NULL;
2683
2684                 goto try_next_stripe;
2685         }
2686
2687         body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
2688         if (body == NULL)
2689                 RETURN(-EPROTO);
2690
2691         /* Not cross-ref case, just get out of here. */
2692         if (likely(!(body->mbo_valid & OBD_MD_MDS)))
2693                 RETURN(rc);
2694
2695         CDEBUG(D_INODE, "%s: try unlink to another MDT for "DFID"\n",
2696                exp->exp_obd->obd_name, PFID(&body->mbo_fid1));
2697
2698         /* This is a remote object, try remote MDT, Note: it may
2699          * try more than 1 time here, Considering following case
2700          * /mnt/lustre is root on MDT0, remote1 is on MDT1
2701          * 1. Initially A does not know where remote1 is, it send
2702          *    unlink RPC to MDT0, MDT0 return -EREMOTE, it will
2703          *    resend unlink RPC to MDT1 (retry 1st time).
2704          *
2705          * 2. During the unlink RPC in flight,
2706          *    client B mv /mnt/lustre/remote1 /mnt/lustre/remote2
2707          *    and create new remote1, but on MDT0
2708          *
2709          * 3. MDT1 get unlink RPC(from A), then do remote lock on
2710          *    /mnt/lustre, then lookup get fid of remote1, and find
2711          *    it is remote dir again, and replay -EREMOTE again.
2712          *
2713          * 4. Then A will resend unlink RPC to MDT0. (retry 2nd times).
2714          *
2715          * In theory, it might try unlimited time here, but it should
2716          * be very rare case.  */
2717         op_data->op_fid2 = body->mbo_fid1;
2718         ptlrpc_req_finished(*request);
2719         *request = NULL;
2720
2721         goto retry_unlink;
2722 }
2723
2724 static int lmv_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
2725 {
2726         struct lmv_obd *lmv = &obd->u.lmv;
2727         int rc = 0;
2728
2729         switch (stage) {
2730         case OBD_CLEANUP_EARLY:
2731                 /* XXX: here should be calling obd_precleanup() down to
2732                  * stack. */
2733                 break;
2734         case OBD_CLEANUP_EXPORTS:
2735                 fld_client_proc_fini(&lmv->lmv_fld);
2736                 lprocfs_obd_cleanup(obd);
2737                 lprocfs_free_md_stats(obd);
2738                 break;
2739         default:
2740                 break;
2741         }
2742         RETURN(rc);
2743 }
2744
2745 /**
2746  * Get by key a value associated with a LMV device.
2747  *
2748  * Dispatch request to lower-layer devices as needed.
2749  *
2750  * \param[in] env               execution environment for this thread
2751  * \param[in] exp               export for the LMV device
2752  * \param[in] keylen            length of key identifier
2753  * \param[in] key               identifier of key to get value for
2754  * \param[in] vallen            size of \a val
2755  * \param[out] val              pointer to storage location for value
2756  * \param[in] lsm               optional striping metadata of object
2757  *
2758  * \retval 0            on success
2759  * \retval negative     negated errno on failure
2760  */
2761 static int lmv_get_info(const struct lu_env *env, struct obd_export *exp,
2762                         __u32 keylen, void *key, __u32 *vallen, void *val,
2763                         struct lov_stripe_md *lsm)
2764 {
2765         struct obd_device       *obd;
2766         struct lmv_obd          *lmv;
2767         int                      rc = 0;
2768         ENTRY;
2769
2770         obd = class_exp2obd(exp);
2771         if (obd == NULL) {
2772                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2773                        exp->exp_handle.h_cookie);
2774                 RETURN(-EINVAL);
2775         }
2776
2777         lmv = &obd->u.lmv;
2778         if (keylen >= strlen("remote_flag") && !strcmp(key, "remote_flag")) {
2779                 int i;
2780
2781                 rc = lmv_check_connect(obd);
2782                 if (rc)
2783                         RETURN(rc);
2784
2785                 LASSERT(*vallen == sizeof(__u32));
2786                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2787                         struct lmv_tgt_desc *tgt = lmv->tgts[i];
2788                         /*
2789                          * All tgts should be connected when this gets called.
2790                          */
2791                         if (tgt == NULL || tgt->ltd_exp == NULL)
2792                                 continue;
2793
2794                         if (!obd_get_info(env, tgt->ltd_exp, keylen, key,
2795                                           vallen, val, NULL))
2796                                 RETURN(0);
2797                 }
2798                 RETURN(-EINVAL);
2799         } else if (KEY_IS(KEY_MAX_EASIZE) ||
2800                    KEY_IS(KEY_DEFAULT_EASIZE) ||
2801                    KEY_IS(KEY_MAX_COOKIESIZE) ||
2802                    KEY_IS(KEY_DEFAULT_COOKIESIZE) ||
2803                    KEY_IS(KEY_CONN_DATA)) {
2804                 rc = lmv_check_connect(obd);
2805                 if (rc)
2806                         RETURN(rc);
2807
2808                 /*
2809                  * Forwarding this request to first MDS, it should know LOV
2810                  * desc.
2811                  */
2812                 rc = obd_get_info(env, lmv->tgts[0]->ltd_exp, keylen, key,
2813                                   vallen, val, NULL);
2814                 if (!rc && KEY_IS(KEY_CONN_DATA))
2815                         exp->exp_connect_data = *(struct obd_connect_data *)val;
2816                 RETURN(rc);
2817         } else if (KEY_IS(KEY_TGT_COUNT)) {
2818                 *((int *)val) = lmv->desc.ld_tgt_count;
2819                 RETURN(0);
2820         }
2821
2822         CDEBUG(D_IOCTL, "Invalid key\n");
2823         RETURN(-EINVAL);
2824 }
2825
2826 /**
2827  * Asynchronously set by key a value associated with a LMV device.
2828  *
2829  * Dispatch request to lower-layer devices as needed.
2830  *
2831  * \param[in] env       execution environment for this thread
2832  * \param[in] exp       export for the LMV device
2833  * \param[in] keylen    length of key identifier
2834  * \param[in] key       identifier of key to store value for
2835  * \param[in] vallen    size of value to store
2836  * \param[in] val       pointer to data to be stored
2837  * \param[in] set       optional list of related ptlrpc requests
2838  *
2839  * \retval 0            on success
2840  * \retval negative     negated errno on failure
2841  */
2842 int lmv_set_info_async(const struct lu_env *env, struct obd_export *exp,
2843                         __u32 keylen, void *key, __u32 vallen, void *val,
2844                         struct ptlrpc_request_set *set)
2845 {
2846         struct lmv_tgt_desc     *tgt = NULL;
2847         struct obd_device       *obd;
2848         struct lmv_obd          *lmv;
2849         int rc = 0;
2850         ENTRY;
2851
2852         obd = class_exp2obd(exp);
2853         if (obd == NULL) {
2854                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2855                        exp->exp_handle.h_cookie);
2856                 RETURN(-EINVAL);
2857         }
2858         lmv = &obd->u.lmv;
2859
2860         if (KEY_IS(KEY_READ_ONLY) || KEY_IS(KEY_FLUSH_CTX) ||
2861             KEY_IS(KEY_DEFAULT_EASIZE)) {
2862                 int i, err = 0;
2863
2864                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2865                         tgt = lmv->tgts[i];
2866
2867                         if (tgt == NULL || tgt->ltd_exp == NULL)
2868                                 continue;
2869
2870                         err = obd_set_info_async(env, tgt->ltd_exp,
2871                                                  keylen, key, vallen, val, set);
2872                         if (err && rc == 0)
2873                                 rc = err;
2874                 }
2875
2876                 RETURN(rc);
2877         }
2878
2879         RETURN(-EINVAL);
2880 }
2881
2882 static int lmv_pack_md_v1(const struct lmv_stripe_md *lsm,
2883                           struct lmv_mds_md_v1 *lmm1)
2884 {
2885         int     cplen;
2886         int     i;
2887
2888         lmm1->lmv_magic = cpu_to_le32(lsm->lsm_md_magic);
2889         lmm1->lmv_stripe_count = cpu_to_le32(lsm->lsm_md_stripe_count);
2890         lmm1->lmv_master_mdt_index = cpu_to_le32(lsm->lsm_md_master_mdt_index);
2891         lmm1->lmv_hash_type = cpu_to_le32(lsm->lsm_md_hash_type);
2892         cplen = strlcpy(lmm1->lmv_pool_name, lsm->lsm_md_pool_name,
2893                         sizeof(lmm1->lmv_pool_name));
2894         if (cplen >= sizeof(lmm1->lmv_pool_name))
2895                 return -E2BIG;
2896
2897         for (i = 0; i < lsm->lsm_md_stripe_count; i++)
2898                 fid_cpu_to_le(&lmm1->lmv_stripe_fids[i],
2899                               &lsm->lsm_md_oinfo[i].lmo_fid);
2900         return 0;
2901 }
2902
2903 int lmv_pack_md(union lmv_mds_md **lmmp, const struct lmv_stripe_md *lsm,
2904                 int stripe_count)
2905 {
2906         int     lmm_size = 0;
2907         bool    allocated = false;
2908         int     rc = 0;
2909         ENTRY;
2910
2911         LASSERT(lmmp != NULL);
2912         /* Free lmm */
2913         if (*lmmp != NULL && lsm == NULL) {
2914                 int stripe_count;
2915
2916                 stripe_count = lmv_mds_md_stripe_count_get(*lmmp);
2917                 lmm_size = lmv_mds_md_size(stripe_count,
2918                                            le32_to_cpu((*lmmp)->lmv_magic));
2919                 if (lmm_size == 0)
2920                         RETURN(-EINVAL);
2921                 OBD_FREE(*lmmp, lmm_size);
2922                 *lmmp = NULL;
2923                 RETURN(0);
2924         }
2925
2926         /* Alloc lmm */
2927         if (*lmmp == NULL && lsm == NULL) {
2928                 lmm_size = lmv_mds_md_size(stripe_count, LMV_MAGIC);
2929                 LASSERT(lmm_size > 0);
2930                 OBD_ALLOC(*lmmp, lmm_size);
2931                 if (*lmmp == NULL)
2932                         RETURN(-ENOMEM);
2933                 lmv_mds_md_stripe_count_set(*lmmp, stripe_count);
2934                 (*lmmp)->lmv_magic = cpu_to_le32(LMV_MAGIC);
2935                 RETURN(lmm_size);
2936         }
2937
2938         /* pack lmm */
2939         LASSERT(lsm != NULL);
2940         lmm_size = lmv_mds_md_size(lsm->lsm_md_stripe_count, lsm->lsm_md_magic);
2941         if (*lmmp == NULL) {
2942                 OBD_ALLOC(*lmmp, lmm_size);
2943                 if (*lmmp == NULL)
2944                         RETURN(-ENOMEM);
2945                 allocated = true;
2946         }
2947
2948         switch (lsm->lsm_md_magic) {
2949         case LMV_MAGIC_V1:
2950                 rc = lmv_pack_md_v1(lsm, &(*lmmp)->lmv_md_v1);
2951                 break;
2952         default:
2953                 rc = -EINVAL;
2954                 break;
2955         }
2956
2957         if (rc != 0 && allocated) {
2958                 OBD_FREE(*lmmp, lmm_size);
2959                 *lmmp = NULL;
2960         }
2961
2962         RETURN(lmm_size);
2963 }
2964
2965 static int lmv_unpack_md_v1(struct obd_export *exp, struct lmv_stripe_md *lsm,
2966                             const struct lmv_mds_md_v1 *lmm1)
2967 {
2968         struct lmv_obd  *lmv = &exp->exp_obd->u.lmv;
2969         int             stripe_count;
2970         int             cplen;
2971         int             i;
2972         int             rc = 0;
2973         ENTRY;
2974
2975         lsm->lsm_md_magic = le32_to_cpu(lmm1->lmv_magic);
2976         lsm->lsm_md_stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
2977         lsm->lsm_md_master_mdt_index = le32_to_cpu(lmm1->lmv_master_mdt_index);
2978         if (OBD_FAIL_CHECK(OBD_FAIL_UNKNOWN_LMV_STRIPE))
2979                 lsm->lsm_md_hash_type = LMV_HASH_TYPE_UNKNOWN;
2980         else
2981                 lsm->lsm_md_hash_type = le32_to_cpu(lmm1->lmv_hash_type);
2982         lsm->lsm_md_layout_version = le32_to_cpu(lmm1->lmv_layout_version);
2983         cplen = strlcpy(lsm->lsm_md_pool_name, lmm1->lmv_pool_name,
2984                         sizeof(lsm->lsm_md_pool_name));
2985
2986         if (cplen >= sizeof(lsm->lsm_md_pool_name))
2987                 RETURN(-E2BIG);
2988
2989         CDEBUG(D_INFO, "unpack lsm count %d, master %d hash_type %d"
2990                "layout_version %d\n", lsm->lsm_md_stripe_count,
2991                lsm->lsm_md_master_mdt_index, lsm->lsm_md_hash_type,
2992                lsm->lsm_md_layout_version);
2993
2994         stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
2995         for (i = 0; i < stripe_count; i++) {
2996                 fid_le_to_cpu(&lsm->lsm_md_oinfo[i].lmo_fid,
2997                               &lmm1->lmv_stripe_fids[i]);
2998                 rc = lmv_fld_lookup(lmv, &lsm->lsm_md_oinfo[i].lmo_fid,
2999                                     &lsm->lsm_md_oinfo[i].lmo_mds);
3000                 if (rc != 0)
3001                         RETURN(rc);
3002                 CDEBUG(D_INFO, "unpack fid #%d "DFID"\n", i,
3003                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid));
3004         }
3005
3006         RETURN(rc);
3007 }
3008
3009 int lmv_unpack_md(struct obd_export *exp, struct lmv_stripe_md **lsmp,
3010                   const union lmv_mds_md *lmm, int stripe_count)
3011 {
3012         struct lmv_stripe_md     *lsm;
3013         int                      lsm_size;
3014         int                      rc;
3015         bool                     allocated = false;
3016         ENTRY;
3017
3018         LASSERT(lsmp != NULL);
3019
3020         lsm = *lsmp;
3021         /* Free memmd */
3022         if (lsm != NULL && lmm == NULL) {
3023                 int i;
3024                 for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
3025                         /* For migrating inode, the master stripe and master
3026                          * object will be the same, so do not need iput, see
3027                          * ll_update_lsm_md */
3028                         if (!(lsm->lsm_md_hash_type & LMV_HASH_FLAG_MIGRATION &&
3029                               i == 0) && lsm->lsm_md_oinfo[i].lmo_root != NULL)
3030                                 iput(lsm->lsm_md_oinfo[i].lmo_root);
3031                 }
3032                 lsm_size = lmv_stripe_md_size(lsm->lsm_md_stripe_count);
3033                 OBD_FREE(lsm, lsm_size);
3034                 *lsmp = NULL;
3035                 RETURN(0);
3036         }
3037
3038         /* Alloc memmd */
3039         if (lsm == NULL && lmm == NULL) {
3040                 lsm_size = lmv_stripe_md_size(stripe_count);
3041                 OBD_ALLOC(lsm, lsm_size);
3042                 if (lsm == NULL)
3043                         RETURN(-ENOMEM);
3044                 lsm->lsm_md_stripe_count = stripe_count;
3045                 *lsmp = lsm;
3046                 RETURN(0);
3047         }
3048
3049         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE)
3050                 RETURN(-EPERM);
3051
3052         /* Unpack memmd */
3053         if (le32_to_cpu(lmm->lmv_magic) != LMV_MAGIC_V1 &&
3054             le32_to_cpu(lmm->lmv_magic) != LMV_USER_MAGIC) {
3055                 CERROR("%s: invalid lmv magic %x: rc = %d\n",
3056                        exp->exp_obd->obd_name, le32_to_cpu(lmm->lmv_magic),
3057                        -EIO);
3058                 RETURN(-EIO);
3059         }
3060
3061         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_V1)
3062                 lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
3063         else
3064                 /**
3065                  * Unpack default dirstripe(lmv_user_md) to lmv_stripe_md,
3066                  * stripecount should be 0 then.
3067                  */
3068                 lsm_size = lmv_stripe_md_size(0);
3069
3070         lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
3071         if (lsm == NULL) {
3072                 OBD_ALLOC(lsm, lsm_size);
3073                 if (lsm == NULL)
3074                         RETURN(-ENOMEM);
3075                 allocated = true;
3076                 *lsmp = lsm;
3077         }
3078
3079         switch (le32_to_cpu(lmm->lmv_magic)) {
3080         case LMV_MAGIC_V1:
3081                 rc = lmv_unpack_md_v1(exp, lsm, &lmm->lmv_md_v1);
3082                 break;
3083         default:
3084                 CERROR("%s: unrecognized magic %x\n", exp->exp_obd->obd_name,
3085                        le32_to_cpu(lmm->lmv_magic));
3086                 rc = -EINVAL;
3087                 break;
3088         }
3089
3090         if (rc != 0 && allocated) {
3091                 OBD_FREE(lsm, lsm_size);
3092                 *lsmp = NULL;
3093                 lsm_size = rc;
3094         }
3095         RETURN(lsm_size);
3096 }
3097
3098 int lmv_alloc_memmd(struct lmv_stripe_md **lsmp, int stripes)
3099 {
3100         return lmv_unpack_md(NULL, lsmp, NULL, stripes);
3101 }
3102
3103 void lmv_free_memmd(struct lmv_stripe_md *lsm)
3104 {
3105         lmv_unpack_md(NULL, &lsm, NULL, 0);
3106 }
3107 EXPORT_SYMBOL(lmv_free_memmd);
3108
3109 int lmv_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
3110                  struct lov_mds_md *lmm, int disk_len)
3111 {
3112         return lmv_unpack_md(exp, (struct lmv_stripe_md **)lsmp,
3113                              (union lmv_mds_md *)lmm, disk_len);
3114 }
3115
3116 int lmv_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
3117                struct lov_stripe_md *lsm)
3118 {
3119         struct obd_device               *obd = exp->exp_obd;
3120         struct lmv_obd                  *lmv_obd = &obd->u.lmv;
3121         const struct lmv_stripe_md      *lmv = (struct lmv_stripe_md *)lsm;
3122         int                             stripe_count;
3123
3124         if (lmmp == NULL) {
3125                 if (lsm != NULL)
3126                         stripe_count = lmv->lsm_md_stripe_count;
3127                 else
3128                         stripe_count = lmv_obd->desc.ld_tgt_count;
3129
3130                 return lmv_mds_md_size(stripe_count, LMV_MAGIC_V1);
3131         }
3132
3133         return lmv_pack_md((union lmv_mds_md **)lmmp, lmv, 0);
3134 }
3135
3136 static int lmv_cancel_unused(struct obd_export *exp, const struct lu_fid *fid,
3137                              ldlm_policy_data_t *policy, ldlm_mode_t mode,
3138                              ldlm_cancel_flags_t flags, void *opaque)
3139 {
3140         struct obd_device       *obd = exp->exp_obd;
3141         struct lmv_obd          *lmv = &obd->u.lmv;
3142         int                      rc = 0;
3143         int                      err;
3144         __u32                    i;
3145         ENTRY;
3146
3147         LASSERT(fid != NULL);
3148
3149         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3150                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
3151
3152                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
3153                         continue;
3154
3155                 err = md_cancel_unused(tgt->ltd_exp, fid, policy, mode, flags,
3156                                        opaque);
3157                 if (!rc)
3158                         rc = err;
3159         }
3160         RETURN(rc);
3161 }
3162
3163 int lmv_set_lock_data(struct obd_export *exp, __u64 *lockh, void *data,
3164                       __u64 *bits)
3165 {
3166         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3167         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3168         int                      rc;
3169         ENTRY;
3170
3171         if (tgt == NULL || tgt->ltd_exp == NULL)
3172                 RETURN(-EINVAL);
3173         rc =  md_set_lock_data(tgt->ltd_exp, lockh, data, bits);
3174         RETURN(rc);
3175 }
3176
3177 ldlm_mode_t lmv_lock_match(struct obd_export *exp, __u64 flags,
3178                            const struct lu_fid *fid, ldlm_type_t type,
3179                            ldlm_policy_data_t *policy, ldlm_mode_t mode,
3180                            struct lustre_handle *lockh)
3181 {
3182         struct obd_device       *obd = exp->exp_obd;
3183         struct lmv_obd          *lmv = &obd->u.lmv;
3184         ldlm_mode_t             rc;
3185         int                     tgt;
3186         int                     i;
3187         ENTRY;
3188
3189         CDEBUG(D_INODE, "Lock match for "DFID"\n", PFID(fid));
3190
3191         /*
3192          * With DNE every object can have two locks in different namespaces:
3193          * lookup lock in space of MDT storing direntry and update/open lock in
3194          * space of MDT storing inode.  Try the MDT that the FID maps to first,
3195          * since this can be easily found, and only try others if that fails.
3196          */
3197         for (i = 0, tgt = lmv_find_target_index(lmv, fid);
3198              i < lmv->desc.ld_tgt_count;
3199              i++, tgt = (tgt + 1) % lmv->desc.ld_tgt_count) {
3200                 if (tgt < 0) {
3201                         CDEBUG(D_HA, "%s: "DFID" is inaccessible: rc = %d\n",
3202                                obd->obd_name, PFID(fid), tgt);
3203                         tgt = 0;
3204                 }
3205
3206                 if (lmv->tgts[tgt] == NULL ||
3207                     lmv->tgts[tgt]->ltd_exp == NULL ||
3208                     lmv->tgts[tgt]->ltd_active == 0)
3209                         continue;
3210
3211                 rc = md_lock_match(lmv->tgts[tgt]->ltd_exp, flags, fid,
3212                                    type, policy, mode, lockh);
3213                 if (rc)
3214                         RETURN(rc);
3215         }
3216
3217         RETURN(0);
3218 }
3219
3220 int lmv_get_lustre_md(struct obd_export *exp, struct ptlrpc_request *req,
3221                       struct obd_export *dt_exp, struct obd_export *md_exp,
3222                       struct lustre_md *md)
3223 {
3224         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3225         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3226
3227         if (tgt == NULL || tgt->ltd_exp == NULL)
3228                 RETURN(-EINVAL);
3229
3230         return md_get_lustre_md(lmv->tgts[0]->ltd_exp, req, dt_exp, md_exp, md);
3231 }
3232
3233 int lmv_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
3234 {
3235         struct obd_device       *obd = exp->exp_obd;
3236         struct lmv_obd          *lmv = &obd->u.lmv;
3237         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3238         ENTRY;
3239
3240         if (md->lmv != NULL) {
3241                 lmv_free_memmd(md->lmv);
3242                 md->lmv = NULL;
3243         }
3244         if (tgt == NULL || tgt->ltd_exp == NULL)
3245                 RETURN(-EINVAL);
3246         RETURN(md_free_lustre_md(lmv->tgts[0]->ltd_exp, md));
3247 }
3248
3249 int lmv_set_open_replay_data(struct obd_export *exp,
3250                              struct obd_client_handle *och,
3251                              struct lookup_intent *it)
3252 {
3253         struct obd_device       *obd = exp->exp_obd;
3254         struct lmv_obd          *lmv = &obd->u.lmv;
3255         struct lmv_tgt_desc     *tgt;
3256         ENTRY;
3257
3258         tgt = lmv_find_target(lmv, &och->och_fid);
3259         if (IS_ERR(tgt))
3260                 RETURN(PTR_ERR(tgt));
3261
3262         RETURN(md_set_open_replay_data(tgt->ltd_exp, och, it));
3263 }
3264
3265 int lmv_clear_open_replay_data(struct obd_export *exp,
3266                                struct obd_client_handle *och)
3267 {
3268         struct obd_device       *obd = exp->exp_obd;
3269         struct lmv_obd          *lmv = &obd->u.lmv;
3270         struct lmv_tgt_desc     *tgt;
3271         ENTRY;
3272
3273         tgt = lmv_find_target(lmv, &och->och_fid);
3274         if (IS_ERR(tgt))
3275                 RETURN(PTR_ERR(tgt));
3276
3277         RETURN(md_clear_open_replay_data(tgt->ltd_exp, och));
3278 }
3279
3280 static int lmv_get_remote_perm(struct obd_export *exp,
3281                                const struct lu_fid *fid,
3282                                struct obd_capa *oc, __u32 suppgid,
3283                                struct ptlrpc_request **request)
3284 {
3285         struct obd_device       *obd = exp->exp_obd;
3286         struct lmv_obd          *lmv = &obd->u.lmv;
3287         struct lmv_tgt_desc     *tgt;
3288         int                      rc;
3289         ENTRY;
3290
3291         rc = lmv_check_connect(obd);
3292         if (rc)
3293                 RETURN(rc);
3294
3295         tgt = lmv_find_target(lmv, fid);
3296         if (IS_ERR(tgt))
3297                 RETURN(PTR_ERR(tgt));
3298
3299         rc = md_get_remote_perm(tgt->ltd_exp, fid, oc, suppgid, request);
3300         RETURN(rc);
3301 }
3302
3303 static int lmv_renew_capa(struct obd_export *exp, struct obd_capa *oc,
3304                           renew_capa_cb_t cb)
3305 {
3306         struct obd_device       *obd = exp->exp_obd;
3307         struct lmv_obd          *lmv = &obd->u.lmv;
3308         struct lmv_tgt_desc     *tgt;
3309         int                      rc;
3310         ENTRY;
3311
3312         rc = lmv_check_connect(obd);
3313         if (rc)
3314                 RETURN(rc);
3315
3316         tgt = lmv_find_target(lmv, &oc->c_capa.lc_fid);
3317         if (IS_ERR(tgt))
3318                 RETURN(PTR_ERR(tgt));
3319
3320         rc = md_renew_capa(tgt->ltd_exp, oc, cb);
3321         RETURN(rc);
3322 }
3323
3324 int lmv_unpack_capa(struct obd_export *exp, struct ptlrpc_request *req,
3325                     const struct req_msg_field *field, struct obd_capa **oc)
3326 {
3327         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3328         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3329
3330         if (tgt == NULL || tgt->ltd_exp == NULL)
3331                 RETURN(-EINVAL);
3332         return md_unpack_capa(tgt->ltd_exp, req, field, oc);
3333 }
3334
3335 int lmv_intent_getattr_async(struct obd_export *exp,
3336                              struct md_enqueue_info *minfo,
3337                              struct ldlm_enqueue_info *einfo)
3338 {
3339         struct md_op_data       *op_data = &minfo->mi_data;
3340         struct obd_device       *obd = exp->exp_obd;
3341         struct lmv_obd          *lmv = &obd->u.lmv;
3342         struct lmv_tgt_desc     *tgt = NULL;
3343         int                      rc;
3344         ENTRY;
3345
3346         rc = lmv_check_connect(obd);
3347         if (rc)
3348                 RETURN(rc);
3349
3350         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
3351         if (IS_ERR(tgt))
3352                 RETURN(PTR_ERR(tgt));
3353
3354         rc = md_intent_getattr_async(tgt->ltd_exp, minfo, einfo);
3355         RETURN(rc);
3356 }
3357
3358 int lmv_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
3359                         struct lu_fid *fid, __u64 *bits)
3360 {
3361         struct obd_device       *obd = exp->exp_obd;
3362         struct lmv_obd          *lmv = &obd->u.lmv;
3363         struct lmv_tgt_desc     *tgt;
3364         int                      rc;
3365         ENTRY;
3366
3367         rc = lmv_check_connect(obd);
3368         if (rc)
3369                 RETURN(rc);
3370
3371         tgt = lmv_find_target(lmv, fid);
3372         if (IS_ERR(tgt))
3373                 RETURN(PTR_ERR(tgt));
3374
3375         rc = md_revalidate_lock(tgt->ltd_exp, it, fid, bits);
3376         RETURN(rc);
3377 }
3378
3379 int lmv_get_fid_from_lsm(struct obd_export *exp,
3380                          const struct lmv_stripe_md *lsm,
3381                          const char *name, int namelen, struct lu_fid *fid)
3382 {
3383         const struct lmv_oinfo *oinfo;
3384
3385         LASSERT(lsm != NULL);
3386         oinfo = lsm_name_to_stripe_info(lsm, name, namelen);
3387         if (IS_ERR(oinfo))
3388                 return PTR_ERR(oinfo);
3389
3390         *fid = oinfo->lmo_fid;
3391
3392         RETURN(0);
3393 }
3394
3395 /**
3396  * For lmv, only need to send request to master MDT, and the master MDT will
3397  * process with other slave MDTs. The only exception is Q_GETOQUOTA for which
3398  * we directly fetch data from the slave MDTs.
3399  */
3400 int lmv_quotactl(struct obd_device *unused, struct obd_export *exp,
3401                  struct obd_quotactl *oqctl)
3402 {
3403         struct obd_device   *obd = class_exp2obd(exp);
3404         struct lmv_obd      *lmv = &obd->u.lmv;
3405         struct lmv_tgt_desc *tgt = lmv->tgts[0];
3406         int                  rc = 0;
3407         __u32                i;
3408         __u64                curspace, curinodes;
3409         ENTRY;
3410
3411         if (tgt == NULL ||
3412             tgt->ltd_exp == NULL ||
3413             !tgt->ltd_active ||
3414             lmv->desc.ld_tgt_count == 0) {
3415                 CERROR("master lmv inactive\n");
3416                 RETURN(-EIO);
3417         }
3418
3419         if (oqctl->qc_cmd != Q_GETOQUOTA) {
3420                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
3421                 RETURN(rc);
3422         }
3423
3424         curspace = curinodes = 0;
3425         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3426                 int err;
3427                 tgt = lmv->tgts[i];
3428
3429                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
3430                         continue;
3431
3432                 err = obd_quotactl(tgt->ltd_exp, oqctl);
3433                 if (err) {
3434                         CERROR("getquota on mdt %d failed. %d\n", i, err);
3435                         if (!rc)
3436                                 rc = err;
3437                 } else {
3438                         curspace += oqctl->qc_dqblk.dqb_curspace;
3439                         curinodes += oqctl->qc_dqblk.dqb_curinodes;
3440                 }
3441         }
3442         oqctl->qc_dqblk.dqb_curspace = curspace;
3443         oqctl->qc_dqblk.dqb_curinodes = curinodes;
3444
3445         RETURN(rc);
3446 }
3447
3448 int lmv_quotacheck(struct obd_device *unused, struct obd_export *exp,
3449                    struct obd_quotactl *oqctl)
3450 {
3451         struct obd_device       *obd = class_exp2obd(exp);
3452         struct lmv_obd          *lmv = &obd->u.lmv;
3453         struct lmv_tgt_desc     *tgt;
3454         __u32                    i;
3455         int                      rc = 0;
3456         ENTRY;
3457
3458         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3459                 int err;
3460                 tgt = lmv->tgts[i];
3461                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active) {
3462                         CERROR("lmv idx %d inactive\n", i);
3463                         RETURN(-EIO);
3464                 }
3465
3466                 err = obd_quotacheck(tgt->ltd_exp, oqctl);
3467                 if (err && !rc)
3468                         rc = err;
3469         }
3470
3471         RETURN(rc);
3472 }
3473
3474 static int lmv_merge_attr(struct obd_export *exp,
3475                           const struct lmv_stripe_md *lsm,
3476                           struct cl_attr *attr,
3477                           ldlm_blocking_callback cb_blocking)
3478 {
3479         int rc;
3480         int i;
3481
3482         rc = lmv_revalidate_slaves(exp, lsm, cb_blocking, 0);
3483         if (rc < 0)
3484                 return rc;
3485
3486         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
3487                 struct inode *inode = lsm->lsm_md_oinfo[i].lmo_root;
3488
3489                 CDEBUG(D_INFO, ""DFID" size %llu, blocks %llu nlink %u,"
3490                        " atime %lu ctime %lu, mtime %lu.\n",
3491                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid),
3492                        i_size_read(inode), (unsigned long long)inode->i_blocks,
3493                        inode->i_nlink, LTIME_S(inode->i_atime),
3494                        LTIME_S(inode->i_ctime), LTIME_S(inode->i_mtime));
3495
3496                 /* for slave stripe, it needs to subtract nlink for . and .. */
3497                 if (i != 0)
3498                         attr->cat_nlink += inode->i_nlink - 2;
3499                 else
3500                         attr->cat_nlink = inode->i_nlink;
3501
3502                 attr->cat_size += i_size_read(inode);
3503                 attr->cat_blocks += inode->i_blocks;
3504
3505                 if (attr->cat_atime < LTIME_S(inode->i_atime))
3506                         attr->cat_atime = LTIME_S(inode->i_atime);
3507
3508                 if (attr->cat_ctime < LTIME_S(inode->i_ctime))
3509                         attr->cat_ctime = LTIME_S(inode->i_ctime);
3510
3511                 if (attr->cat_mtime < LTIME_S(inode->i_mtime))
3512                         attr->cat_mtime = LTIME_S(inode->i_mtime);
3513         }
3514         return 0;
3515 }
3516
3517 struct obd_ops lmv_obd_ops = {
3518         .o_owner                = THIS_MODULE,
3519         .o_setup                = lmv_setup,
3520         .o_cleanup              = lmv_cleanup,
3521         .o_precleanup           = lmv_precleanup,
3522         .o_process_config       = lmv_process_config,
3523         .o_connect              = lmv_connect,
3524         .o_disconnect           = lmv_disconnect,
3525         .o_statfs               = lmv_statfs,
3526         .o_get_info             = lmv_get_info,
3527         .o_set_info_async       = lmv_set_info_async,
3528         .o_packmd               = lmv_packmd,
3529         .o_unpackmd             = lmv_unpackmd,
3530         .o_notify               = lmv_notify,
3531         .o_get_uuid             = lmv_get_uuid,
3532         .o_iocontrol            = lmv_iocontrol,
3533         .o_quotacheck           = lmv_quotacheck,
3534         .o_quotactl             = lmv_quotactl
3535 };
3536
3537 struct md_ops lmv_md_ops = {
3538         .m_getstatus            = lmv_getstatus,
3539         .m_null_inode           = lmv_null_inode,
3540         .m_find_cbdata          = lmv_find_cbdata,
3541         .m_close                = lmv_close,
3542         .m_create               = lmv_create,
3543         .m_enqueue              = lmv_enqueue,
3544         .m_getattr              = lmv_getattr,
3545         .m_getxattr             = lmv_getxattr,
3546         .m_getattr_name         = lmv_getattr_name,
3547         .m_intent_lock          = lmv_intent_lock,
3548         .m_link                 = lmv_link,
3549         .m_rename               = lmv_rename,
3550         .m_setattr              = lmv_setattr,
3551         .m_setxattr             = lmv_setxattr,
3552         .m_fsync                = lmv_fsync,
3553         .m_read_page            = lmv_read_page,
3554         .m_unlink               = lmv_unlink,
3555         .m_init_ea_size         = lmv_init_ea_size,
3556         .m_cancel_unused        = lmv_cancel_unused,
3557         .m_set_lock_data        = lmv_set_lock_data,
3558         .m_lock_match           = lmv_lock_match,
3559         .m_get_lustre_md        = lmv_get_lustre_md,
3560         .m_free_lustre_md       = lmv_free_lustre_md,
3561         .m_merge_attr           = lmv_merge_attr,
3562         .m_set_open_replay_data = lmv_set_open_replay_data,
3563         .m_clear_open_replay_data = lmv_clear_open_replay_data,
3564         .m_renew_capa           = lmv_renew_capa,
3565         .m_unpack_capa          = lmv_unpack_capa,
3566         .m_get_remote_perm      = lmv_get_remote_perm,
3567         .m_intent_getattr_async = lmv_intent_getattr_async,
3568         .m_revalidate_lock      = lmv_revalidate_lock,
3569         .m_get_fid_from_lsm     = lmv_get_fid_from_lsm,
3570 };
3571
3572 int __init lmv_init(void)
3573 {
3574         return class_register_type(&lmv_obd_ops, &lmv_md_ops, true, NULL,
3575                                    LUSTRE_LMV_NAME, NULL);
3576 }
3577
3578 static void lmv_exit(void)
3579 {
3580         class_unregister_type(LUSTRE_LMV_NAME);
3581 }
3582
3583 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
3584 MODULE_DESCRIPTION("Lustre Logical Metadata Volume OBD driver");
3585 MODULE_LICENSE("GPL");
3586
3587 module_init(lmv_init);
3588 module_exit(lmv_exit);