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/user_namespace.h>
  42 #ifdef HAVE_UIDGID_HEADER
  43 # include <linux/uidgid.h>
  44 #endif
  45 #include <linux/slab.h>
  46 #include <linux/pagemap.h>
  47 #include <linux/mm.h>
  48 #include <linux/math64.h>
  49 #include <linux/seq_file.h>
  50 #include <linux/namei.h>
  51
  52 #include <lustre/lustre_idl.h>
  53 #include <obd_support.h>
  54 #include <lustre_lib.h>
  55 #include <lustre_net.h>
  56 #include <obd_class.h>
  57 #include <lustre_lmv.h>
  58 #include <lprocfs_status.h>
  59 #include <cl_object.h>
  60 #include <lustre_fid.h>
  61 #include <lustre_ioctl.h>
  62 #include <lustre_kernelcomm.h>
  63 #include "lmv_internal.h"
  64
  65 static void lmv_activate_target(struct lmv_obd *lmv,
  66                                 struct lmv_tgt_desc *tgt,
  67                                 int activate)
  68 {
  69         if (tgt->ltd_active == activate)
  70                 return;
  71
  72         tgt->ltd_active = activate;
  73         lmv->desc.ld_active_tgt_count += (activate ? 1 : -1);
  74 }
  75
  76 /**
  77  * Error codes:
  78  *
  79  *  -EINVAL  : UUID can't be found in the LMV's target list
  80  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
  81  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
  82  */
  83 static int lmv_set_mdc_active(struct lmv_obd *lmv,
  84                               const struct obd_uuid *uuid,
  85                               int activate)
  86 {
  87         struct lmv_tgt_desc     *tgt = NULL;
  88         struct obd_device       *obd;
  89         __u32                    i;
  90         int                      rc = 0;
  91         ENTRY;
  92
  93         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
  94                         lmv, uuid->uuid, activate);
  95
  96         spin_lock(&lmv->lmv_lock);
  97         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
  98                 tgt = lmv->tgts[i];
  99                 if (tgt == NULL || tgt->ltd_exp == NULL)
 100                         continue;
 101
 102                 CDEBUG(D_INFO, "Target idx %d is %s conn "LPX64"\n", i,
 103                        tgt->ltd_uuid.uuid, tgt->ltd_exp->exp_handle.h_cookie);
 104
 105                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 106                         break;
 107         }
 108
 109         if (i == lmv->desc.ld_tgt_count)
 110                 GOTO(out_lmv_lock, rc = -EINVAL);
 111
 112         obd = class_exp2obd(tgt->ltd_exp);
 113         if (obd == NULL)
 114                 GOTO(out_lmv_lock, rc = -ENOTCONN);
 115
 116         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
 117                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
 118                obd->obd_type->typ_name, i);
 119         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0);
 120
 121         if (tgt->ltd_active == activate) {
 122                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
 123                        activate ? "" : "in");
 124                 GOTO(out_lmv_lock, rc);
 125         }
 126
 127         CDEBUG(D_INFO, "Marking OBD %p %sactive\n", obd,
 128                activate ? "" : "in");
 129         lmv_activate_target(lmv, tgt, activate);
 130         EXIT;
 131
 132  out_lmv_lock:
 133         spin_unlock(&lmv->lmv_lock);
 134         return rc;
 135 }
 136
 137 struct obd_uuid *lmv_get_uuid(struct obd_export *exp)
 138 {
 139         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
 140         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
 141
 142         return (tgt == NULL) ? NULL : obd_get_uuid(tgt->ltd_exp);
 143 }
 144
 145 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
 146                       enum obd_notify_event ev, void *data)
 147 {
 148         struct obd_connect_data *conn_data;
 149         struct lmv_obd          *lmv = &obd->u.lmv;
 150         struct obd_uuid         *uuid;
 151         int                      rc = 0;
 152         ENTRY;
 153
 154         if (strcmp(watched->obd_type->typ_name, LUSTRE_MDC_NAME)) {
 155                 CERROR("unexpected notification of %s %s!\n",
 156                        watched->obd_type->typ_name,
 157                        watched->obd_name);
 158                 RETURN(-EINVAL);
 159         }
 160
 161         uuid = &watched->u.cli.cl_target_uuid;
 162         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE) {
 163                 /*
 164                  * Set MDC as active before notifying the observer, so the
 165                  * observer can use the MDC normally.
 166                  */
 167                 rc = lmv_set_mdc_active(lmv, uuid,
 168                                         ev == OBD_NOTIFY_ACTIVE);
 169                 if (rc) {
 170                         CERROR("%sactivation of %s failed: %d\n",
 171                                ev == OBD_NOTIFY_ACTIVE ? "" : "de",
 172                                uuid->uuid, rc);
 173                         RETURN(rc);
 174                 }
 175         } else if (ev == OBD_NOTIFY_OCD) {
 176                 conn_data = &watched->u.cli.cl_import->imp_connect_data;
 177                 /*
 178                  * XXX: Make sure that ocd_connect_flags from all targets are
 179                  * the same. Otherwise one of MDTs runs wrong version or
 180                  * something like this.  --umka
 181                  */
 182                 obd->obd_self_export->exp_connect_data = *conn_data;
 183         }
 184 #if 0
 185         else if (ev == OBD_NOTIFY_DISCON) {
 186                 /*
 187                  * For disconnect event, flush fld cache for failout MDS case.
 188                  */
 189                 fld_client_flush(&lmv->lmv_fld);
 190         }
 191 #endif
 192         /*
 193          * Pass the notification up the chain.
 194          */
 195         if (obd->obd_observer)
 196                 rc = obd_notify(obd->obd_observer, watched, ev, data);
 197
 198         RETURN(rc);
 199 }
 200
 201 /**
 202  * This is fake connect function. Its purpose is to initialize lmv and say
 203  * caller that everything is okay. Real connection will be performed later.
 204  */
 205 static int lmv_connect(const struct lu_env *env,
 206                        struct obd_export **exp, struct obd_device *obd,
 207                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 208                        void *localdata)
 209 {
 210         struct lmv_obd        *lmv = &obd->u.lmv;
 211         struct lustre_handle  conn = { 0 };
 212         int                    rc = 0;
 213         ENTRY;
 214
 215         /*
 216          * We don't want to actually do the underlying connections more than
 217          * once, so keep track.
 218          */
 219         lmv->refcount++;
 220         if (lmv->refcount > 1) {
 221                 *exp = NULL;
 222                 RETURN(0);
 223         }
 224
 225         rc = class_connect(&conn, obd, cluuid);
 226         if (rc) {
 227                 CERROR("class_connection() returned %d\n", rc);
 228                 RETURN(rc);
 229         }
 230
 231         *exp = class_conn2export(&conn);
 232         class_export_get(*exp);
 233
 234         lmv->exp = *exp;
 235         lmv->connected = 0;
 236         lmv->cluuid = *cluuid;
 237
 238         if (data)
 239                 lmv->conn_data = *data;
 240
 241         if (lmv->targets_proc_entry == NULL) {
 242                 lmv->targets_proc_entry = lprocfs_register("target_obds",
 243                                                            obd->obd_proc_entry,
 244                                                            NULL, NULL);
 245                 if (IS_ERR(lmv->targets_proc_entry)) {
 246                         CERROR("%s: cannot register "
 247                                "/proc/fs/lustre/%s/%s/target_obds\n",
 248                                obd->obd_name, obd->obd_type->typ_name,
 249                                obd->obd_name);
 250                         lmv->targets_proc_entry = NULL;
 251                 }
 252         }
 253
 254         /*
 255          * All real clients should perform actual connection right away, because
 256          * it is possible, that LMV will not have opportunity to connect targets
 257          * and MDC stuff will be called directly, for instance while reading
 258          * ../mdc/../kbytesfree procfs file, etc.
 259          */
 260         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_REAL))
 261                 rc = lmv_check_connect(obd);
 262
 263         if (rc && lmv->targets_proc_entry != NULL)
 264                 lprocfs_remove(&lmv->targets_proc_entry);
 265         RETURN(rc);
 266 }
 267
 268 static int lmv_init_ea_size(struct obd_export *exp,
 269                             __u32 easize, __u32 def_easize,
 270                             __u32 cookiesize, __u32 def_cookiesize)
 271 {
 272         struct obd_device       *obd = exp->exp_obd;
 273         struct lmv_obd          *lmv = &obd->u.lmv;
 274         __u32                    i;
 275         int                      rc = 0;
 276         int                      change = 0;
 277         ENTRY;
 278
 279         if (lmv->max_easize < easize) {
 280                 lmv->max_easize = easize;
 281                 change = 1;
 282         }
 283         if (lmv->max_def_easize < def_easize) {
 284                 lmv->max_def_easize = def_easize;
 285                 change = 1;
 286         }
 287         if (lmv->max_cookiesize < cookiesize) {
 288                 lmv->max_cookiesize = cookiesize;
 289                 change = 1;
 290         }
 291         if (lmv->max_def_cookiesize < def_cookiesize) {
 292                 lmv->max_def_cookiesize = def_cookiesize;
 293                 change = 1;
 294         }
 295         if (change == 0)
 296                 RETURN(0);
 297
 298         if (lmv->connected == 0)
 299                 RETURN(0);
 300
 301         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 302                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 303
 304                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active) {
 305                         CWARN("%s: NULL export for %d\n", obd->obd_name, i);
 306                         continue;
 307                 }
 308
 309                 rc = md_init_ea_size(tgt->ltd_exp, easize, def_easize,
 310                                      cookiesize, def_cookiesize);
 311                 if (rc) {
 312                         CERROR("%s: obd_init_ea_size() failed on MDT target %d:"
 313                                " rc = %d\n", obd->obd_name, i, rc);
 314                         break;
 315                 }
 316         }
 317         RETURN(rc);
 318 }
 319
 320 #define MAX_STRING_SIZE 128
 321
 322 int lmv_connect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 323 {
 324         struct lmv_obd          *lmv = &obd->u.lmv;
 325         struct obd_uuid         *cluuid = &lmv->cluuid;
 326         struct obd_uuid          lmv_mdc_uuid = { "LMV_MDC_UUID" };
 327         struct obd_device       *mdc_obd;
 328         struct obd_export       *mdc_exp;
 329         struct lu_fld_target     target;
 330         int                      rc;
 331         ENTRY;
 332
 333         mdc_obd = class_find_client_obd(&tgt->ltd_uuid, LUSTRE_MDC_NAME,
 334                                         &obd->obd_uuid);
 335         if (!mdc_obd) {
 336                 CERROR("target %s not attached\n", tgt->ltd_uuid.uuid);
 337                 RETURN(-EINVAL);
 338         }
 339
 340         CDEBUG(D_CONFIG, "connect to %s(%s) - %s, %s FOR %s\n",
 341                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 342                 tgt->ltd_uuid.uuid, obd->obd_uuid.uuid,
 343                 cluuid->uuid);
 344
 345         if (!mdc_obd->obd_set_up) {
 346                 CERROR("target %s is not set up\n", tgt->ltd_uuid.uuid);
 347                 RETURN(-EINVAL);
 348         }
 349
 350         rc = obd_connect(NULL, &mdc_exp, mdc_obd, &lmv_mdc_uuid,
 351                          &lmv->conn_data, NULL);
 352         if (rc) {
 353                 CERROR("target %s connect error %d\n", tgt->ltd_uuid.uuid, rc);
 354                 RETURN(rc);
 355         }
 356
 357         /*
 358          * Init fid sequence client for this mdc and add new fld target.
 359          */
 360         rc = obd_fid_init(mdc_obd, mdc_exp, LUSTRE_SEQ_METADATA);
 361         if (rc)
 362                 RETURN(rc);
 363
 364         target.ft_srv = NULL;
 365         target.ft_exp = mdc_exp;
 366         target.ft_idx = tgt->ltd_idx;
 367
 368         fld_client_add_target(&lmv->lmv_fld, &target);
 369
 370         rc = obd_register_observer(mdc_obd, obd);
 371         if (rc) {
 372                 obd_disconnect(mdc_exp);
 373                 CERROR("target %s register_observer error %d\n",
 374                        tgt->ltd_uuid.uuid, rc);
 375                 RETURN(rc);
 376         }
 377
 378         if (obd->obd_observer) {
 379                 /*
 380                  * Tell the observer about the new target.
 381                  */
 382                 rc = obd_notify(obd->obd_observer, mdc_exp->exp_obd,
 383                                 OBD_NOTIFY_ACTIVE,
 384                                 (void *)(tgt - lmv->tgts[0]));
 385                 if (rc) {
 386                         obd_disconnect(mdc_exp);
 387                         RETURN(rc);
 388                 }
 389         }
 390
 391         tgt->ltd_active = 1;
 392         tgt->ltd_exp = mdc_exp;
 393         lmv->desc.ld_active_tgt_count++;
 394
 395         md_init_ea_size(tgt->ltd_exp, lmv->max_easize, lmv->max_def_easize,
 396                         lmv->max_cookiesize, lmv->max_def_cookiesize);
 397
 398         CDEBUG(D_CONFIG, "Connected to %s(%s) successfully (%d)\n",
 399                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 400                 atomic_read(&obd->obd_refcount));
 401
 402         if (lmv->targets_proc_entry != NULL) {
 403                 struct proc_dir_entry *mdc_symlink;
 404
 405                 LASSERT(mdc_obd->obd_type != NULL);
 406                 LASSERT(mdc_obd->obd_type->typ_name != NULL);
 407                 mdc_symlink = lprocfs_add_symlink(mdc_obd->obd_name,
 408                                                   lmv->targets_proc_entry,
 409                                                   "../../../%s/%s",
 410                                                   mdc_obd->obd_type->typ_name,
 411                                                   mdc_obd->obd_name);
 412                 if (mdc_symlink == NULL) {
 413                         CERROR("cannot register LMV target "
 414                                "/proc/fs/lustre/%s/%s/target_obds/%s\n",
 415                                obd->obd_type->typ_name, obd->obd_name,
 416                                mdc_obd->obd_name);
 417                 }
 418         }
 419         RETURN(0);
 420 }
 421
 422 static void lmv_del_target(struct lmv_obd *lmv, int index)
 423 {
 424         if (lmv->tgts[index] == NULL)
 425                 return;
 426
 427         OBD_FREE_PTR(lmv->tgts[index]);
 428         lmv->tgts[index] = NULL;
 429         return;
 430 }
 431
 432 static int lmv_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 433                            __u32 index, int gen)
 434 {
 435         struct lmv_obd      *lmv = &obd->u.lmv;
 436         struct lmv_tgt_desc *tgt;
 437         int                  orig_tgt_count = 0;
 438         int                  rc = 0;
 439         ENTRY;
 440
 441         CDEBUG(D_CONFIG, "Target uuid: %s. index %d\n", uuidp->uuid, index);
 442
 443         mutex_lock(&lmv->lmv_init_mutex);
 444
 445         if (lmv->desc.ld_tgt_count == 0) {
 446                 struct obd_device *mdc_obd;
 447
 448                 mdc_obd = class_find_client_obd(uuidp, LUSTRE_MDC_NAME,
 449                                                 &obd->obd_uuid);
 450                 if (!mdc_obd) {
 451                         mutex_unlock(&lmv->lmv_init_mutex);
 452                         CERROR("%s: Target %s not attached: rc = %d\n",
 453                                obd->obd_name, uuidp->uuid, -EINVAL);
 454                         RETURN(-EINVAL);
 455                 }
 456         }
 457
 458         if ((index < lmv->tgts_size) && (lmv->tgts[index] != NULL)) {
 459                 tgt = lmv->tgts[index];
 460                 CERROR("%s: UUID %s already assigned at LOV target index %d:"
 461                        " rc = %d\n", obd->obd_name,
 462                        obd_uuid2str(&tgt->ltd_uuid), index, -EEXIST);
 463                 mutex_unlock(&lmv->lmv_init_mutex);
 464                 RETURN(-EEXIST);
 465         }
 466
 467         if (index >= lmv->tgts_size) {
 468                 /* We need to reallocate the lmv target array. */
 469                 struct lmv_tgt_desc **newtgts, **old = NULL;
 470                 __u32 newsize = 1;
 471                 __u32 oldsize = 0;
 472
 473                 while (newsize < index + 1)
 474                         newsize = newsize << 1;
 475                 OBD_ALLOC(newtgts, sizeof(*newtgts) * newsize);
 476                 if (newtgts == NULL) {
 477                         mutex_unlock(&lmv->lmv_init_mutex);
 478                         RETURN(-ENOMEM);
 479                 }
 480
 481                 if (lmv->tgts_size) {
 482                         memcpy(newtgts, lmv->tgts,
 483                                sizeof(*newtgts) * lmv->tgts_size);
 484                         old = lmv->tgts;
 485                         oldsize = lmv->tgts_size;
 486                 }
 487
 488                 lmv->tgts = newtgts;
 489                 lmv->tgts_size = newsize;
 490                 smp_rmb();
 491                 if (old)
 492                         OBD_FREE(old, sizeof(*old) * oldsize);
 493
 494                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n", lmv->tgts,
 495                        lmv->tgts_size);
 496         }
 497
 498         OBD_ALLOC_PTR(tgt);
 499         if (!tgt) {
 500                 mutex_unlock(&lmv->lmv_init_mutex);
 501                 RETURN(-ENOMEM);
 502         }
 503
 504         mutex_init(&tgt->ltd_fid_mutex);
 505         tgt->ltd_idx = index;
 506         tgt->ltd_uuid = *uuidp;
 507         tgt->ltd_active = 0;
 508         lmv->tgts[index] = tgt;
 509         if (index >= lmv->desc.ld_tgt_count) {
 510                 orig_tgt_count = lmv->desc.ld_tgt_count;
 511                 lmv->desc.ld_tgt_count = index + 1;
 512         }
 513
 514         if (lmv->connected) {
 515                 rc = lmv_connect_mdc(obd, tgt);
 516                 if (rc != 0) {
 517                         spin_lock(&lmv->lmv_lock);
 518                         if (lmv->desc.ld_tgt_count == index + 1)
 519                                 lmv->desc.ld_tgt_count = orig_tgt_count;
 520                         memset(tgt, 0, sizeof(*tgt));
 521                         spin_unlock(&lmv->lmv_lock);
 522                 } else {
 523                         int easize = sizeof(struct lmv_stripe_md) +
 524                                 lmv->desc.ld_tgt_count * sizeof(struct lu_fid);
 525                         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0, 0);
 526                 }
 527         }
 528
 529         mutex_unlock(&lmv->lmv_init_mutex);
 530         RETURN(rc);
 531 }
 532
 533 int lmv_check_connect(struct obd_device *obd)
 534 {
 535         struct lmv_obd          *lmv = &obd->u.lmv;
 536         struct lmv_tgt_desc     *tgt;
 537         __u32                    i;
 538         int                      rc;
 539         int                      easize;
 540         ENTRY;
 541
 542         if (lmv->connected)
 543                 RETURN(0);
 544
 545         mutex_lock(&lmv->lmv_init_mutex);
 546         if (lmv->connected) {
 547                 mutex_unlock(&lmv->lmv_init_mutex);
 548                 RETURN(0);
 549         }
 550
 551         if (lmv->desc.ld_tgt_count == 0) {
 552                 mutex_unlock(&lmv->lmv_init_mutex);
 553                 CERROR("%s: no targets configured.\n", obd->obd_name);
 554                 RETURN(-EINVAL);
 555         }
 556
 557         LASSERT(lmv->tgts != NULL);
 558
 559         if (lmv->tgts[0] == NULL) {
 560                 mutex_unlock(&lmv->lmv_init_mutex);
 561                 CERROR("%s: no target configured for index 0.\n",
 562                        obd->obd_name);
 563                 RETURN(-EINVAL);
 564         }
 565
 566         CDEBUG(D_CONFIG, "Time to connect %s to %s\n",
 567                lmv->cluuid.uuid, obd->obd_name);
 568
 569         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 570                 tgt = lmv->tgts[i];
 571                 if (tgt == NULL)
 572                         continue;
 573                 rc = lmv_connect_mdc(obd, tgt);
 574                 if (rc)
 575                         GOTO(out_disc, rc);
 576         }
 577
 578         class_export_put(lmv->exp);
 579         lmv->connected = 1;
 580         easize = lmv_mds_md_size(lmv->desc.ld_tgt_count, LMV_MAGIC);
 581         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0, 0);
 582         mutex_unlock(&lmv->lmv_init_mutex);
 583         RETURN(0);
 584
 585  out_disc:
 586         while (i-- > 0) {
 587                 int rc2;
 588                 tgt = lmv->tgts[i];
 589                 if (tgt == NULL)
 590                         continue;
 591                 tgt->ltd_active = 0;
 592                 if (tgt->ltd_exp) {
 593                         --lmv->desc.ld_active_tgt_count;
 594                         rc2 = obd_disconnect(tgt->ltd_exp);
 595                         if (rc2) {
 596                                 CERROR("LMV target %s disconnect on "
 597                                        "MDC idx %d: error %d\n",
 598                                        tgt->ltd_uuid.uuid, i, rc2);
 599                         }
 600                 }
 601         }
 602         class_disconnect(lmv->exp);
 603         mutex_unlock(&lmv->lmv_init_mutex);
 604         RETURN(rc);
 605 }
 606
 607 static int lmv_disconnect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 608 {
 609         struct lmv_obd         *lmv = &obd->u.lmv;
 610         struct obd_device      *mdc_obd;
 611         int                     rc;
 612         ENTRY;
 613
 614         LASSERT(tgt != NULL);
 615         LASSERT(obd != NULL);
 616
 617         mdc_obd = class_exp2obd(tgt->ltd_exp);
 618
 619         if (mdc_obd) {
 620                 mdc_obd->obd_force = obd->obd_force;
 621                 mdc_obd->obd_fail = obd->obd_fail;
 622                 mdc_obd->obd_no_recov = obd->obd_no_recov;
 623         }
 624
 625         if (lmv->targets_proc_entry != NULL)
 626                 lprocfs_remove_proc_entry(mdc_obd->obd_name,
 627                                           lmv->targets_proc_entry);
 628
 629         rc = obd_fid_fini(tgt->ltd_exp->exp_obd);
 630         if (rc)
 631                 CERROR("Can't finanize fids factory\n");
 632
 633         CDEBUG(D_INFO, "Disconnected from %s(%s) successfully\n",
 634                tgt->ltd_exp->exp_obd->obd_name,
 635                tgt->ltd_exp->exp_obd->obd_uuid.uuid);
 636
 637         obd_register_observer(tgt->ltd_exp->exp_obd, NULL);
 638         rc = obd_disconnect(tgt->ltd_exp);
 639         if (rc) {
 640                 if (tgt->ltd_active) {
 641                         CERROR("Target %s disconnect error %d\n",
 642                                tgt->ltd_uuid.uuid, rc);
 643                 }
 644         }
 645
 646         lmv_activate_target(lmv, tgt, 0);
 647         tgt->ltd_exp = NULL;
 648         RETURN(0);
 649 }
 650
 651 static int lmv_disconnect(struct obd_export *exp)
 652 {
 653         struct obd_device       *obd = class_exp2obd(exp);
 654         struct lmv_obd          *lmv = &obd->u.lmv;
 655         int                      rc;
 656         __u32                    i;
 657         ENTRY;
 658
 659         if (!lmv->tgts)
 660                 goto out_local;
 661
 662         /*
 663          * Only disconnect the underlying layers on the final disconnect.
 664          */
 665         lmv->refcount--;
 666         if (lmv->refcount != 0)
 667                 goto out_local;
 668
 669         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 670                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
 671                         continue;
 672
 673                 lmv_disconnect_mdc(obd, lmv->tgts[i]);
 674         }
 675
 676         if (lmv->targets_proc_entry != NULL)
 677                 lprocfs_remove(&lmv->targets_proc_entry);
 678         else
 679                 CERROR("/proc/fs/lustre/%s/%s/target_obds missing\n",
 680                        obd->obd_type->typ_name, obd->obd_name);
 681
 682 out_local:
 683         /*
 684          * This is the case when no real connection is established by
 685          * lmv_check_connect().
 686          */
 687         if (!lmv->connected)
 688                 class_export_put(exp);
 689         rc = class_disconnect(exp);
 690         if (lmv->refcount == 0)
 691                 lmv->connected = 0;
 692         RETURN(rc);
 693 }
 694
 695 static int lmv_fid2path(struct obd_export *exp, int len, void *karg, void *uarg)
 696 {
 697         struct obd_device       *obddev = class_exp2obd(exp);
 698         struct lmv_obd          *lmv = &obddev->u.lmv;
 699         struct getinfo_fid2path *gf;
 700         struct lmv_tgt_desc     *tgt;
 701         struct getinfo_fid2path *remote_gf = NULL;
 702         int                     remote_gf_size = 0;
 703         int                     rc;
 704
 705         gf = (struct getinfo_fid2path *)karg;
 706         tgt = lmv_find_target(lmv, &gf->gf_fid);
 707         if (IS_ERR(tgt))
 708                 RETURN(PTR_ERR(tgt));
 709
 710 repeat_fid2path:
 711         rc = obd_iocontrol(OBD_IOC_FID2PATH, tgt->ltd_exp, len, gf, uarg);
 712         if (rc != 0 && rc != -EREMOTE)
 713                 GOTO(out_fid2path, rc);
 714
 715         /* If remote_gf != NULL, it means just building the
 716          * path on the remote MDT, copy this path segement to gf */
 717         if (remote_gf != NULL) {
 718                 struct getinfo_fid2path *ori_gf;
 719                 char *ptr;
 720
 721                 ori_gf = (struct getinfo_fid2path *)karg;
 722                 if (strlen(ori_gf->gf_path) +
 723                     strlen(gf->gf_path) > ori_gf->gf_pathlen)
 724                         GOTO(out_fid2path, rc = -EOVERFLOW);
 725
 726                 ptr = ori_gf->gf_path;
 727
 728                 memmove(ptr + strlen(gf->gf_path) + 1, ptr,
 729                         strlen(ori_gf->gf_path));
 730
 731                 strncpy(ptr, gf->gf_path, strlen(gf->gf_path));
 732                 ptr += strlen(gf->gf_path);
 733                 *ptr = '/';
 734         }
 735
 736         CDEBUG(D_INFO, "%s: get path %s "DFID" rec: "LPU64" ln: %u\n",
 737                tgt->ltd_exp->exp_obd->obd_name,
 738                gf->gf_path, PFID(&gf->gf_fid), gf->gf_recno,
 739                gf->gf_linkno);
 740
 741         if (rc == 0)
 742                 GOTO(out_fid2path, rc);
 743
 744         /* sigh, has to go to another MDT to do path building further */
 745         if (remote_gf == NULL) {
 746                 remote_gf_size = sizeof(*remote_gf) + PATH_MAX;
 747                 OBD_ALLOC(remote_gf, remote_gf_size);
 748                 if (remote_gf == NULL)
 749                         GOTO(out_fid2path, rc = -ENOMEM);
 750                 remote_gf->gf_pathlen = PATH_MAX;
 751         }
 752
 753         if (!fid_is_sane(&gf->gf_fid)) {
 754                 CERROR("%s: invalid FID "DFID": rc = %d\n",
 755                        tgt->ltd_exp->exp_obd->obd_name,
 756                        PFID(&gf->gf_fid), -EINVAL);
 757                 GOTO(out_fid2path, rc = -EINVAL);
 758         }
 759
 760         tgt = lmv_find_target(lmv, &gf->gf_fid);
 761         if (IS_ERR(tgt))
 762                 GOTO(out_fid2path, rc = -EINVAL);
 763
 764         remote_gf->gf_fid = gf->gf_fid;
 765         remote_gf->gf_recno = -1;
 766         remote_gf->gf_linkno = -1;
 767         memset(remote_gf->gf_path, 0, remote_gf->gf_pathlen);
 768         gf = remote_gf;
 769         goto repeat_fid2path;
 770
 771 out_fid2path:
 772         if (remote_gf != NULL)
 773                 OBD_FREE(remote_gf, remote_gf_size);
 774         RETURN(rc);
 775 }
 776
 777 static int lmv_hsm_req_count(struct lmv_obd *lmv,
 778                              const struct hsm_user_request *hur,
 779                              const struct lmv_tgt_desc *tgt_mds)
 780 {
 781         __u32                    i;
 782         int                      nr = 0;
 783         struct lmv_tgt_desc     *curr_tgt;
 784
 785         /* count how many requests must be sent to the given target */
 786         for (i = 0; i < hur->hur_request.hr_itemcount; i++) {
 787                 curr_tgt = lmv_find_target(lmv, &hur->hur_user_item[i].hui_fid);
 788                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid))
 789                         nr++;
 790         }
 791         return nr;
 792 }
 793
 794 static void lmv_hsm_req_build(struct lmv_obd *lmv,
 795                               struct hsm_user_request *hur_in,
 796                               const struct lmv_tgt_desc *tgt_mds,
 797                               struct hsm_user_request *hur_out)
 798 {
 799         __u32                    i, nr_out;
 800         struct lmv_tgt_desc     *curr_tgt;
 801
 802         /* build the hsm_user_request for the given target */
 803         hur_out->hur_request = hur_in->hur_request;
 804         nr_out = 0;
 805         for (i = 0; i < hur_in->hur_request.hr_itemcount; i++) {
 806                 curr_tgt = lmv_find_target(lmv,
 807                                            &hur_in->hur_user_item[i].hui_fid);
 808                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid)) {
 809                         hur_out->hur_user_item[nr_out] =
 810                                                 hur_in->hur_user_item[i];
 811                         nr_out++;
 812                 }
 813         }
 814         hur_out->hur_request.hr_itemcount = nr_out;
 815         memcpy(hur_data(hur_out), hur_data(hur_in),
 816                hur_in->hur_request.hr_data_len);
 817 }
 818
 819 static int lmv_hsm_ct_unregister(struct lmv_obd *lmv, unsigned int cmd, int len,
 820                                  struct lustre_kernelcomm *lk, void *uarg)
 821 {
 822         __u32                    i;
 823         int                      rc;
 824         struct kkuc_ct_data     *kcd = NULL;
 825         ENTRY;
 826
 827         /* unregister request (call from llapi_hsm_copytool_fini) */
 828         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 829                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 830
 831                 if (tgt == NULL || tgt->ltd_exp == NULL)
 832                         continue;
 833                 /* best effort: try to clean as much as possible
 834                  * (continue on error) */
 835                 obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
 836         }
 837
 838         /* Whatever the result, remove copytool from kuc groups.
 839          * Unreached coordinators will get EPIPE on next requests
 840          * and will unregister automatically.
 841          */
 842         rc = libcfs_kkuc_group_rem(lk->lk_uid, lk->lk_group, (void **)&kcd);
 843         if (kcd != NULL)
 844                 OBD_FREE_PTR(kcd);
 845
 846         RETURN(rc);
 847 }
 848
 849 static int lmv_hsm_ct_register(struct lmv_obd *lmv, unsigned int cmd, int len,
 850                                struct lustre_kernelcomm *lk, void *uarg)
 851 {
 852         struct file             *filp;
 853         __u32                    i, j;
 854         int                      err, rc;
 855         bool                     any_set = false;
 856         struct kkuc_ct_data     *kcd;
 857         ENTRY;
 858
 859         /* All or nothing: try to register to all MDS.
 860          * In case of failure, unregister from previous MDS,
 861          * except if it because of inactive target. */
 862         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 863                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 864
 865                 if (tgt == NULL || tgt->ltd_exp == NULL)
 866                         continue;
 867                 err = obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
 868                 if (err) {
 869                         if (tgt->ltd_active) {
 870                                 /* permanent error */
 871                                 CERROR("%s: iocontrol MDC %s on MDT"
 872                                        " idx %d cmd %x: err = %d\n",
 873                                        class_exp2obd(lmv->exp)->obd_name,
 874                                        tgt->ltd_uuid.uuid, i, cmd, err);
 875                                 rc = err;
 876                                 lk->lk_flags |= LK_FLG_STOP;
 877                                 /* unregister from previous MDS */
 878                                 for (j = 0; j < i; j++) {
 879                                         tgt = lmv->tgts[j];
 880                                         if (tgt == NULL || tgt->ltd_exp == NULL)
 881                                                 continue;
 882                                         obd_iocontrol(cmd, tgt->ltd_exp, len,
 883                                                       lk, uarg);
 884                                 }
 885                                 RETURN(rc);
 886                         }
 887                         /* else: transient error.
 888                          * kuc will register to the missing MDT
 889                          * when it is back */
 890                 } else {
 891                         any_set = true;
 892                 }
 893         }
 894
 895         if (!any_set)
 896                 /* no registration done: return error */
 897                 RETURN(-ENOTCONN);
 898
 899         /* at least one registration done, with no failure */
 900         filp = fget(lk->lk_wfd);
 901         if (filp == NULL)
 902                 RETURN(-EBADF);
 903
 904         OBD_ALLOC_PTR(kcd);
 905         if (kcd == NULL) {
 906                 fput(filp);
 907                 RETURN(-ENOMEM);
 908         }
 909         kcd->kcd_magic = KKUC_CT_DATA_MAGIC;
 910         kcd->kcd_uuid = lmv->cluuid;
 911         kcd->kcd_archive = lk->lk_data;
 912
 913         rc = libcfs_kkuc_group_add(filp, lk->lk_uid, lk->lk_group, kcd);
 914         if (rc != 0) {
 915                 if (filp != NULL)
 916                         fput(filp);
 917                 OBD_FREE_PTR(kcd);
 918         }
 919
 920         RETURN(rc);
 921 }
 922
 923
 924
 925
 926 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
 927                          int len, void *karg, void *uarg)
 928 {
 929         struct obd_device       *obddev = class_exp2obd(exp);
 930         struct lmv_obd          *lmv = &obddev->u.lmv;
 931         struct lmv_tgt_desc     *tgt = NULL;
 932         __u32                    i = 0;
 933         int                      rc = 0;
 934         int                      set = 0;
 935         __u32                    count = lmv->desc.ld_tgt_count;
 936         ENTRY;
 937
 938         if (count == 0)
 939                 RETURN(-ENOTTY);
 940
 941         switch (cmd) {
 942         case IOC_OBD_STATFS: {
 943                 struct obd_ioctl_data *data = karg;
 944                 struct obd_device *mdc_obd;
 945                 struct obd_statfs stat_buf = {0};
 946                 __u32 index;
 947
 948                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
 949                 if ((index >= count))
 950                         RETURN(-ENODEV);
 951
 952                 tgt = lmv->tgts[index];
 953                 if (tgt == NULL || !tgt->ltd_active)
 954                         RETURN(-ENODATA);
 955
 956                 mdc_obd = class_exp2obd(tgt->ltd_exp);
 957                 if (!mdc_obd)
 958                         RETURN(-EINVAL);
 959
 960                 /* copy UUID */
 961                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(mdc_obd),
 962                                  min((int) data->ioc_plen2,
 963                                      (int) sizeof(struct obd_uuid))))
 964                         RETURN(-EFAULT);
 965
 966                 rc = obd_statfs(NULL, tgt->ltd_exp, &stat_buf,
 967                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 968                                 0);
 969                 if (rc)
 970                         RETURN(rc);
 971                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
 972                                  min((int) data->ioc_plen1,
 973                                      (int) sizeof(stat_buf))))
 974                         RETURN(-EFAULT);
 975                 break;
 976         }
 977         case OBD_IOC_QUOTACTL: {
 978                 struct if_quotactl *qctl = karg;
 979                 struct obd_quotactl *oqctl;
 980
 981                 if (qctl->qc_valid == QC_MDTIDX) {
 982                         if (count <= qctl->qc_idx)
 983                                 RETURN(-EINVAL);
 984
 985                         tgt = lmv->tgts[qctl->qc_idx];
 986                         if (tgt == NULL || tgt->ltd_exp == NULL)
 987                                 RETURN(-EINVAL);
 988                 } else if (qctl->qc_valid == QC_UUID) {
 989                         for (i = 0; i < count; i++) {
 990                                 tgt = lmv->tgts[i];
 991                                 if (tgt == NULL)
 992                                         continue;
 993                                 if (!obd_uuid_equals(&tgt->ltd_uuid,
 994                                                      &qctl->obd_uuid))
 995                                         continue;
 996
 997                                 if (tgt->ltd_exp == NULL)
 998                                         RETURN(-EINVAL);
 999
1000                                 break;
1001                         }
1002                 } else {
1003                         RETURN(-EINVAL);
1004                 }
1005
1006                 if (i >= count)
1007                         RETURN(-EAGAIN);
1008
1009                 LASSERT(tgt != NULL && tgt->ltd_exp != NULL);
1010                 OBD_ALLOC_PTR(oqctl);
1011                 if (!oqctl)
1012                         RETURN(-ENOMEM);
1013
1014                 QCTL_COPY(oqctl, qctl);
1015                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
1016                 if (rc == 0) {
1017                         QCTL_COPY(qctl, oqctl);
1018                         qctl->qc_valid = QC_MDTIDX;
1019                         qctl->obd_uuid = tgt->ltd_uuid;
1020                 }
1021                 OBD_FREE_PTR(oqctl);
1022                 break;
1023         }
1024         case OBD_IOC_CHANGELOG_SEND:
1025         case OBD_IOC_CHANGELOG_CLEAR: {
1026                 struct ioc_changelog *icc = karg;
1027
1028                 if (icc->icc_mdtindex >= count)
1029                         RETURN(-ENODEV);
1030
1031                 tgt = lmv->tgts[icc->icc_mdtindex];
1032                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
1033                         RETURN(-ENODEV);
1034                 rc = obd_iocontrol(cmd, tgt->ltd_exp, sizeof(*icc), icc, NULL);
1035                 break;
1036         }
1037         case LL_IOC_GET_CONNECT_FLAGS: {
1038                 tgt = lmv->tgts[0];
1039                 if (tgt == NULL || tgt->ltd_exp == NULL)
1040                         RETURN(-ENODATA);
1041                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1042                 break;
1043         }
1044         case LL_IOC_FID2MDTIDX: {
1045                 struct lu_fid *fid = karg;
1046                 int             mdt_index;
1047
1048                 rc = lmv_fld_lookup(lmv, fid, &mdt_index);
1049                 if (rc != 0)
1050                         RETURN(rc);
1051
1052                 /* Note: this is from llite(see ll_dir_ioctl()), @uarg does not
1053                  * point to user space memory for FID2MDTIDX. */
1054                 *(__u32 *)uarg = mdt_index;
1055                 break;
1056         }
1057         case OBD_IOC_FID2PATH: {
1058                 rc = lmv_fid2path(exp, len, karg, uarg);
1059                 break;
1060         }
1061         case LL_IOC_HSM_STATE_GET:
1062         case LL_IOC_HSM_STATE_SET:
1063         case LL_IOC_HSM_ACTION: {
1064                 struct md_op_data       *op_data = karg;
1065
1066                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
1067                 if (IS_ERR(tgt))
1068                         RETURN(PTR_ERR(tgt));
1069
1070                 if (tgt->ltd_exp == NULL)
1071                         RETURN(-EINVAL);
1072
1073                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1074                 break;
1075         }
1076         case LL_IOC_HSM_PROGRESS: {
1077                 const struct hsm_progress_kernel *hpk = karg;
1078
1079                 tgt = lmv_find_target(lmv, &hpk->hpk_fid);
1080                 if (IS_ERR(tgt))
1081                         RETURN(PTR_ERR(tgt));
1082                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1083                 break;
1084         }
1085         case LL_IOC_HSM_REQUEST: {
1086                 struct hsm_user_request *hur = karg;
1087                 unsigned int reqcount = hur->hur_request.hr_itemcount;
1088
1089                 if (reqcount == 0)
1090                         RETURN(0);
1091
1092                 /* if the request is about a single fid
1093                  * or if there is a single MDS, no need to split
1094                  * the request. */
1095                 if (reqcount == 1 || count == 1) {
1096                         tgt = lmv_find_target(lmv,
1097                                               &hur->hur_user_item[0].hui_fid);
1098                         if (IS_ERR(tgt))
1099                                 RETURN(PTR_ERR(tgt));
1100                         rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1101                 } else {
1102                         /* split fid list to their respective MDS */
1103                         for (i = 0; i < count; i++) {
1104                                 unsigned int            nr, reqlen;
1105                                 int                     rc1;
1106                                 struct hsm_user_request *req;
1107
1108                                 tgt = lmv->tgts[i];
1109                                 if (tgt == NULL || tgt->ltd_exp == NULL)
1110                                         continue;
1111
1112                                 nr = lmv_hsm_req_count(lmv, hur, tgt);
1113                                 if (nr == 0) /* nothing for this MDS */
1114                                         continue;
1115
1116                                 /* build a request with fids for this MDS */
1117                                 reqlen = offsetof(typeof(*hur),
1118                                                   hur_user_item[nr])
1119                                                 + hur->hur_request.hr_data_len;
1120                                 OBD_ALLOC_LARGE(req, reqlen);
1121                                 if (req == NULL)
1122                                         RETURN(-ENOMEM);
1123
1124                                 lmv_hsm_req_build(lmv, hur, tgt, req);
1125
1126                                 rc1 = obd_iocontrol(cmd, tgt->ltd_exp, reqlen,
1127                                                     req, uarg);
1128                                 if (rc1 != 0 && rc == 0)
1129                                         rc = rc1;
1130                                 OBD_FREE_LARGE(req, reqlen);
1131                         }
1132                 }
1133                 break;
1134         }
1135         case LL_IOC_LOV_SWAP_LAYOUTS: {
1136                 struct md_op_data       *op_data = karg;
1137                 struct lmv_tgt_desc     *tgt1, *tgt2;
1138
1139                 tgt1 = lmv_find_target(lmv, &op_data->op_fid1);
1140                 if (IS_ERR(tgt1))
1141                         RETURN(PTR_ERR(tgt1));
1142
1143                 tgt2 = lmv_find_target(lmv, &op_data->op_fid2);
1144                 if (IS_ERR(tgt2))
1145                         RETURN(PTR_ERR(tgt2));
1146
1147                 if ((tgt1->ltd_exp == NULL) || (tgt2->ltd_exp == NULL))
1148                         RETURN(-EINVAL);
1149
1150                 /* only files on same MDT can have their layouts swapped */
1151                 if (tgt1->ltd_idx != tgt2->ltd_idx)
1152                         RETURN(-EPERM);
1153
1154                 rc = obd_iocontrol(cmd, tgt1->ltd_exp, len, karg, uarg);
1155                 break;
1156         }
1157         case LL_IOC_HSM_CT_START: {
1158                 struct lustre_kernelcomm *lk = karg;
1159                 if (lk->lk_flags & LK_FLG_STOP)
1160                         rc = lmv_hsm_ct_unregister(lmv, cmd, len, lk, uarg);
1161                 else
1162                         rc = lmv_hsm_ct_register(lmv, cmd, len, lk, uarg);
1163                 break;
1164         }
1165         default:
1166                 for (i = 0; i < count; i++) {
1167                         struct obd_device *mdc_obd;
1168                         int err;
1169
1170                         tgt = lmv->tgts[i];
1171                         if (tgt == NULL || tgt->ltd_exp == NULL)
1172                                 continue;
1173                         /* ll_umount_begin() sets force flag but for lmv, not
1174                          * mdc. Let's pass it through */
1175                         mdc_obd = class_exp2obd(tgt->ltd_exp);
1176                         mdc_obd->obd_force = obddev->obd_force;
1177                         err = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1178                         if (err == -ENODATA && cmd == OBD_IOC_POLL_QUOTACHECK) {
1179                                 RETURN(err);
1180                         } else if (err) {
1181                                 if (tgt->ltd_active) {
1182                                         CERROR("error: iocontrol MDC %s on MDT"
1183                                                " idx %d cmd %x: err = %d\n",
1184                                                tgt->ltd_uuid.uuid, i, cmd, err);
1185                                         if (!rc)
1186                                                 rc = err;
1187                                 }
1188                         } else
1189                                 set = 1;
1190                 }
1191                 if (!set && !rc)
1192                         rc = -EIO;
1193         }
1194         RETURN(rc);
1195 }
1196
1197 #if 0
1198 static int lmv_all_chars_policy(int count, const char *name,
1199                                 int len)
1200 {
1201         unsigned int c = 0;
1202
1203         while (len > 0)
1204                 c += name[--len];
1205         c = c % count;
1206         return c;
1207 }
1208
1209 static int lmv_nid_policy(struct lmv_obd *lmv)
1210 {
1211         struct obd_import *imp;
1212         __u32              id;
1213
1214         /*
1215          * XXX: To get nid we assume that underlying obd device is mdc.
1216          */
1217         imp = class_exp2cliimp(lmv->tgts[0].ltd_exp);
1218         id = imp->imp_connection->c_self ^ (imp->imp_connection->c_self >> 32);
1219         return id % lmv->desc.ld_tgt_count;
1220 }
1221
1222 static int lmv_choose_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
1223                           placement_policy_t placement)
1224 {
1225         switch (placement) {
1226         case PLACEMENT_CHAR_POLICY:
1227                 return lmv_all_chars_policy(lmv->desc.ld_tgt_count,
1228                                             op_data->op_name,
1229                                             op_data->op_namelen);
1230         case PLACEMENT_NID_POLICY:
1231                 return lmv_nid_policy(lmv);
1232
1233         default:
1234                 break;
1235         }
1236
1237         CERROR("Unsupported placement policy %x\n", placement);
1238         return -EINVAL;
1239 }
1240 #endif
1241
1242 /**
1243  * This is _inode_ placement policy function (not name).
1244  */
1245 static int lmv_placement_policy(struct obd_device *obd,
1246                                 struct md_op_data *op_data, u32 *mds)
1247 {
1248         struct lmv_obd          *lmv = &obd->u.lmv;
1249         ENTRY;
1250
1251         LASSERT(mds != NULL);
1252
1253         if (lmv->desc.ld_tgt_count == 1) {
1254                 *mds = 0;
1255                 RETURN(0);
1256         }
1257
1258         if (op_data->op_default_stripe_offset != -1) {
1259                 *mds = op_data->op_default_stripe_offset;
1260                 RETURN(0);
1261         }
1262
1263         /**
1264          * If stripe_offset is provided during setdirstripe
1265          * (setdirstripe -i xx), xx MDS will be choosen.
1266          */
1267         if (op_data->op_cli_flags & CLI_SET_MEA && op_data->op_data != NULL) {
1268                 struct lmv_user_md *lum;
1269
1270                 lum = op_data->op_data;
1271
1272                 if (le32_to_cpu(lum->lum_stripe_offset) != (__u32)-1) {
1273                         *mds = le32_to_cpu(lum->lum_stripe_offset);
1274                 } else {
1275                         /* -1 means default, which will be in the same MDT with
1276                          * the stripe */
1277                         *mds = op_data->op_mds;
1278                         lum->lum_stripe_offset = cpu_to_le32(op_data->op_mds);
1279                 }
1280         } else {
1281                 /* Allocate new fid on target according to operation type and
1282                  * parent home mds. */
1283                 *mds = op_data->op_mds;
1284         }
1285
1286         RETURN(0);
1287 }
1288
1289 int __lmv_fid_alloc(struct lmv_obd *lmv, struct lu_fid *fid, u32 mds)
1290 {
1291         struct lmv_tgt_desc     *tgt;
1292         int                      rc;
1293         ENTRY;
1294
1295         tgt = lmv_get_target(lmv, mds, NULL);
1296         if (IS_ERR(tgt))
1297                 RETURN(PTR_ERR(tgt));
1298
1299         /*
1300          * New seq alloc and FLD setup should be atomic. Otherwise we may find
1301          * on server that seq in new allocated fid is not yet known.
1302          */
1303         mutex_lock(&tgt->ltd_fid_mutex);
1304
1305         if (tgt->ltd_active == 0 || tgt->ltd_exp == NULL)
1306                 GOTO(out, rc = -ENODEV);
1307
1308         /*
1309          * Asking underlying tgt layer to allocate new fid.
1310          */
1311         rc = obd_fid_alloc(NULL, tgt->ltd_exp, fid, NULL);
1312         if (rc > 0) {
1313                 LASSERT(fid_is_sane(fid));
1314                 rc = 0;
1315         }
1316
1317         EXIT;
1318 out:
1319         mutex_unlock(&tgt->ltd_fid_mutex);
1320         return rc;
1321 }
1322
1323 int lmv_fid_alloc(const struct lu_env *env, struct obd_export *exp,
1324                   struct lu_fid *fid, struct md_op_data *op_data)
1325 {
1326         struct obd_device     *obd = class_exp2obd(exp);
1327         struct lmv_obd        *lmv = &obd->u.lmv;
1328         u32                    mds = 0;
1329         int                    rc;
1330         ENTRY;
1331
1332         LASSERT(op_data != NULL);
1333         LASSERT(fid != NULL);
1334
1335         rc = lmv_placement_policy(obd, op_data, &mds);
1336         if (rc) {
1337                 CERROR("Can't get target for allocating fid, "
1338                        "rc %d\n", rc);
1339                 RETURN(rc);
1340         }
1341
1342         rc = __lmv_fid_alloc(lmv, fid, mds);
1343         if (rc) {
1344                 CERROR("Can't alloc new fid, rc %d\n", rc);
1345                 RETURN(rc);
1346         }
1347
1348         RETURN(rc);
1349 }
1350
1351 static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
1352 {
1353         struct lmv_obd  *lmv = &obd->u.lmv;
1354         struct lmv_desc *desc;
1355         int             rc;
1356         ENTRY;
1357
1358         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1359                 CERROR("LMV setup requires a descriptor\n");
1360                 RETURN(-EINVAL);
1361         }
1362
1363         desc = (struct lmv_desc *)lustre_cfg_buf(lcfg, 1);
1364         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1365                 CERROR("Lmv descriptor size wrong: %d > %d\n",
1366                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1367                 RETURN(-EINVAL);
1368         }
1369
1370         lmv->tgts_size = 32U;
1371         OBD_ALLOC(lmv->tgts, sizeof(*lmv->tgts) * lmv->tgts_size);
1372         if (lmv->tgts == NULL)
1373                 RETURN(-ENOMEM);
1374
1375         obd_str2uuid(&lmv->desc.ld_uuid, desc->ld_uuid.uuid);
1376         lmv->desc.ld_tgt_count = 0;
1377         lmv->desc.ld_active_tgt_count = 0;
1378         lmv->max_cookiesize = 0;
1379         lmv->max_def_easize = 0;
1380         lmv->max_easize = 0;
1381         lmv->lmv_placement = PLACEMENT_CHAR_POLICY;
1382
1383         spin_lock_init(&lmv->lmv_lock);
1384         mutex_init(&lmv->lmv_init_mutex);
1385
1386 #ifdef CONFIG_PROC_FS
1387         obd->obd_vars = lprocfs_lmv_obd_vars;
1388         lprocfs_obd_setup(obd);
1389         lprocfs_alloc_md_stats(obd, 0);
1390         rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
1391                                 0444, &lmv_proc_target_fops, obd);
1392         if (rc)
1393                 CWARN("%s: error adding LMV target_obd file: rc = %d\n",
1394                       obd->obd_name, rc);
1395 #endif
1396         rc = fld_client_init(&lmv->lmv_fld, obd->obd_name,
1397                              LUSTRE_CLI_FLD_HASH_DHT);
1398         if (rc) {
1399                 CERROR("Can't init FLD, err %d\n", rc);
1400                 GOTO(out, rc);
1401         }
1402
1403         RETURN(0);
1404
1405 out:
1406         return rc;
1407 }
1408
1409 static int lmv_cleanup(struct obd_device *obd)
1410 {
1411         struct lmv_obd   *lmv = &obd->u.lmv;
1412         ENTRY;
1413
1414         fld_client_fini(&lmv->lmv_fld);
1415         if (lmv->tgts != NULL) {
1416                 int i;
1417                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1418                         if (lmv->tgts[i] == NULL)
1419                                 continue;
1420                         lmv_del_target(lmv, i);
1421                 }
1422                 OBD_FREE(lmv->tgts, sizeof(*lmv->tgts) * lmv->tgts_size);
1423                 lmv->tgts_size = 0;
1424         }
1425         RETURN(0);
1426 }
1427
1428 static int lmv_process_config(struct obd_device *obd, size_t len, void *buf)
1429 {
1430         struct lustre_cfg       *lcfg = buf;
1431         struct obd_uuid         obd_uuid;
1432         int                     gen;
1433         __u32                   index;
1434         int                     rc;
1435         ENTRY;
1436
1437         switch (lcfg->lcfg_command) {
1438         case LCFG_ADD_MDC:
1439                 /* modify_mdc_tgts add 0:lustre-clilmv  1:lustre-MDT0000_UUID
1440                  * 2:0  3:1  4:lustre-MDT0000-mdc_UUID */
1441                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
1442                         GOTO(out, rc = -EINVAL);
1443
1444                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
1445
1446                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%u", &index) != 1)
1447                         GOTO(out, rc = -EINVAL);
1448                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", &gen) != 1)
1449                         GOTO(out, rc = -EINVAL);
1450                 rc = lmv_add_target(obd, &obd_uuid, index, gen);
1451                 GOTO(out, rc);
1452         default:
1453                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1454                 GOTO(out, rc = -EINVAL);
1455         }
1456 out:
1457         RETURN(rc);
1458 }
1459
1460 static int lmv_statfs(const struct lu_env *env, struct obd_export *exp,
1461                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
1462 {
1463         struct obd_device       *obd = class_exp2obd(exp);
1464         struct lmv_obd          *lmv = &obd->u.lmv;
1465         struct obd_statfs       *temp;
1466         int                      rc = 0;
1467         __u32                    i;
1468         ENTRY;
1469
1470         rc = lmv_check_connect(obd);
1471         if (rc)
1472                 RETURN(rc);
1473
1474         OBD_ALLOC(temp, sizeof(*temp));
1475         if (temp == NULL)
1476                 RETURN(-ENOMEM);
1477
1478         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1479                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1480                         continue;
1481
1482                 rc = obd_statfs(env, lmv->tgts[i]->ltd_exp, temp,
1483                                 max_age, flags);
1484                 if (rc) {
1485                         CERROR("can't stat MDS #%d (%s), error %d\n", i,
1486                                lmv->tgts[i]->ltd_exp->exp_obd->obd_name,
1487                                rc);
1488                         GOTO(out_free_temp, rc);
1489                 }
1490
1491                 if (i == 0) {
1492                         *osfs = *temp;
1493                         /* If the statfs is from mount, it will needs
1494                          * retrieve necessary information from MDT0.
1495                          * i.e. mount does not need the merged osfs
1496                          * from all of MDT.
1497                          * And also clients can be mounted as long as
1498                          * MDT0 is in service*/
1499                         if (flags & OBD_STATFS_FOR_MDT0)
1500                                 GOTO(out_free_temp, rc);
1501                 } else {
1502                         osfs->os_bavail += temp->os_bavail;
1503                         osfs->os_blocks += temp->os_blocks;
1504                         osfs->os_ffree += temp->os_ffree;
1505                         osfs->os_files += temp->os_files;
1506                 }
1507         }
1508
1509         EXIT;
1510 out_free_temp:
1511         OBD_FREE(temp, sizeof(*temp));
1512         return rc;
1513 }
1514
1515 static int lmv_getstatus(struct obd_export *exp,
1516                          struct lu_fid *fid,
1517                          struct obd_capa **pc)
1518 {
1519         struct obd_device    *obd = exp->exp_obd;
1520         struct lmv_obd       *lmv = &obd->u.lmv;
1521         int                   rc;
1522         ENTRY;
1523
1524         rc = lmv_check_connect(obd);
1525         if (rc)
1526                 RETURN(rc);
1527
1528         rc = md_getstatus(lmv->tgts[0]->ltd_exp, fid, pc);
1529         RETURN(rc);
1530 }
1531
1532 static int lmv_getxattr(struct obd_export *exp, const struct lu_fid *fid,
1533                         struct obd_capa *oc, u64 valid, const char *name,
1534                         const char *input, int input_size, int output_size,
1535                         int flags, struct ptlrpc_request **request)
1536 {
1537         struct obd_device      *obd = exp->exp_obd;
1538         struct lmv_obd         *lmv = &obd->u.lmv;
1539         struct lmv_tgt_desc    *tgt;
1540         int                     rc;
1541         ENTRY;
1542
1543         rc = lmv_check_connect(obd);
1544         if (rc)
1545                 RETURN(rc);
1546
1547         tgt = lmv_find_target(lmv, fid);
1548         if (IS_ERR(tgt))
1549                 RETURN(PTR_ERR(tgt));
1550
1551         rc = md_getxattr(tgt->ltd_exp, fid, oc, valid, name, input,
1552                          input_size, output_size, flags, request);
1553
1554         RETURN(rc);
1555 }
1556
1557 static int lmv_setxattr(struct obd_export *exp, const struct lu_fid *fid,
1558                         struct obd_capa *oc, u64 valid, const char *name,
1559                         const char *input, int input_size, int output_size,
1560                         int flags, __u32 suppgid,
1561                         struct ptlrpc_request **request)
1562 {
1563         struct obd_device      *obd = exp->exp_obd;
1564         struct lmv_obd         *lmv = &obd->u.lmv;
1565         struct lmv_tgt_desc    *tgt;
1566         int                     rc;
1567         ENTRY;
1568
1569         rc = lmv_check_connect(obd);
1570         if (rc)
1571                 RETURN(rc);
1572
1573         tgt = lmv_find_target(lmv, fid);
1574         if (IS_ERR(tgt))
1575                 RETURN(PTR_ERR(tgt));
1576
1577         rc = md_setxattr(tgt->ltd_exp, fid, oc, valid, name, input,
1578                          input_size, output_size, flags, suppgid,
1579                          request);
1580
1581         RETURN(rc);
1582 }
1583
1584 static int lmv_getattr(struct obd_export *exp, struct md_op_data *op_data,
1585                        struct ptlrpc_request **request)
1586 {
1587         struct obd_device       *obd = exp->exp_obd;
1588         struct lmv_obd          *lmv = &obd->u.lmv;
1589         struct lmv_tgt_desc     *tgt;
1590         int                      rc;
1591         ENTRY;
1592
1593         rc = lmv_check_connect(obd);
1594         if (rc)
1595                 RETURN(rc);
1596
1597         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1598         if (IS_ERR(tgt))
1599                 RETURN(PTR_ERR(tgt));
1600
1601         if (op_data->op_flags & MF_GET_MDT_IDX) {
1602                 op_data->op_mds = tgt->ltd_idx;
1603                 RETURN(0);
1604         }
1605
1606         rc = md_getattr(tgt->ltd_exp, op_data, request);
1607
1608         RETURN(rc);
1609 }
1610
1611 static int lmv_null_inode(struct obd_export *exp, const struct lu_fid *fid)
1612 {
1613         struct obd_device   *obd = exp->exp_obd;
1614         struct lmv_obd      *lmv = &obd->u.lmv;
1615         __u32                i;
1616         int                  rc;
1617         ENTRY;
1618
1619         rc = lmv_check_connect(obd);
1620         if (rc)
1621                 RETURN(rc);
1622
1623         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1624
1625         /*
1626          * With DNE every object can have two locks in different namespaces:
1627          * lookup lock in space of MDT storing direntry and update/open lock in
1628          * space of MDT storing inode.
1629          */
1630         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1631                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1632                         continue;
1633                 md_null_inode(lmv->tgts[i]->ltd_exp, fid);
1634         }
1635
1636         RETURN(0);
1637 }
1638
1639 static int lmv_find_cbdata(struct obd_export *exp, const struct lu_fid *fid,
1640                            ldlm_iterator_t it, void *data)
1641 {
1642         struct obd_device       *obd = exp->exp_obd;
1643         struct lmv_obd          *lmv = &obd->u.lmv;
1644         int                     i;
1645         int                     tgt;
1646         int                     rc;
1647         ENTRY;
1648
1649         rc = lmv_check_connect(obd);
1650         if (rc)
1651                 RETURN(rc);
1652
1653         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1654
1655         /*
1656          * With DNE every object can have two locks in different namespaces:
1657          * lookup lock in space of MDT storing direntry and update/open lock in
1658          * space of MDT storing inode.  Try the MDT that the FID maps to first,
1659          * since this can be easily found, and only try others if that fails.
1660          */
1661         for (i = 0, tgt = lmv_find_target_index(lmv, fid);
1662              i < lmv->desc.ld_tgt_count;
1663              i++, tgt = (tgt + 1) % lmv->desc.ld_tgt_count) {
1664                 if (tgt < 0) {
1665                         CDEBUG(D_HA, "%s: "DFID" is inaccessible: rc = %d\n",
1666                                obd->obd_name, PFID(fid), tgt);
1667                         tgt = 0;
1668                 }
1669
1670                 if (lmv->tgts[tgt] == NULL ||
1671                     lmv->tgts[tgt]->ltd_exp == NULL)
1672                         continue;
1673
1674                 rc = md_find_cbdata(lmv->tgts[tgt]->ltd_exp, fid, it, data);
1675                 if (rc)
1676                         RETURN(rc);
1677         }
1678
1679         RETURN(rc);
1680 }
1681
1682
1683 static int lmv_close(struct obd_export *exp, struct md_op_data *op_data,
1684                      struct md_open_data *mod, struct ptlrpc_request **request)
1685 {
1686         struct obd_device     *obd = exp->exp_obd;
1687         struct lmv_obd        *lmv = &obd->u.lmv;
1688         struct lmv_tgt_desc   *tgt;
1689         int                    rc;
1690         ENTRY;
1691
1692         rc = lmv_check_connect(obd);
1693         if (rc)
1694                 RETURN(rc);
1695
1696         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1697         if (IS_ERR(tgt))
1698                 RETURN(PTR_ERR(tgt));
1699
1700         CDEBUG(D_INODE, "CLOSE "DFID"\n", PFID(&op_data->op_fid1));
1701         rc = md_close(tgt->ltd_exp, op_data, mod, request);
1702         RETURN(rc);
1703 }
1704
1705 /**
1706  * Choosing the MDT by name or FID in @op_data.
1707  * For non-striped directory, it will locate MDT by fid.
1708  * For striped-directory, it will locate MDT by name. And also
1709  * it will reset op_fid1 with the FID of the choosen stripe.
1710  **/
1711 struct lmv_tgt_desc *
1712 lmv_locate_target_for_name(struct lmv_obd *lmv, struct lmv_stripe_md *lsm,
1713                            const char *name, int namelen, struct lu_fid *fid,
1714                            u32 *mds)
1715 {
1716         struct lmv_tgt_desc     *tgt;
1717         const struct lmv_oinfo  *oinfo;
1718
1719         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_NAME_HASH)) {
1720                 if (cfs_fail_val >= lsm->lsm_md_stripe_count)
1721                         RETURN(ERR_PTR(-EBADF));
1722                 oinfo = &lsm->lsm_md_oinfo[cfs_fail_val];
1723         } else {
1724                 oinfo = lsm_name_to_stripe_info(lsm, name, namelen);
1725                 if (IS_ERR(oinfo))
1726                         RETURN(ERR_CAST(oinfo));
1727         }
1728
1729         if (fid != NULL)
1730                 *fid = oinfo->lmo_fid;
1731         if (mds != NULL)
1732                 *mds = oinfo->lmo_mds;
1733
1734         tgt = lmv_get_target(lmv, oinfo->lmo_mds, NULL);
1735
1736         CDEBUG(D_INFO, "locate on mds %u "DFID"\n", oinfo->lmo_mds,
1737                PFID(&oinfo->lmo_fid));
1738         return tgt;
1739 }
1740
1741 /**
1742  * Locate mds by fid or name
1743  *
1744  * For striped directory (lsm != NULL), it will locate the stripe
1745  * by name hash (see lsm_name_to_stripe_info()). Note: if the hash_type
1746  * is unknown, it will return -EBADFD, and lmv_intent_lookup might need
1747  * walk through all of stripes to locate the entry.
1748  *
1749  * For normal direcotry, it will locate MDS by FID directly.
1750  * \param[in] lmv       LMV device
1751  * \param[in] op_data   client MD stack parameters, name, namelen
1752  *                      mds_num etc.
1753  * \param[in] fid       object FID used to locate MDS.
1754  *
1755  * retval               pointer to the lmv_tgt_desc if succeed.
1756  *                      ERR_PTR(errno) if failed.
1757  */
1758 struct lmv_tgt_desc*
1759 lmv_locate_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
1760                struct lu_fid *fid)
1761 {
1762         struct lmv_stripe_md    *lsm = op_data->op_mea1;
1763         struct lmv_tgt_desc     *tgt;
1764
1765         /* During creating VOLATILE file, it should honor the mdt
1766          * index if the file under striped dir is being restored, see
1767          * ct_restore(). */
1768         if (op_data->op_bias & MDS_CREATE_VOLATILE &&
1769             (int)op_data->op_mds != -1 && lsm != NULL) {
1770                 int i;
1771                 tgt = lmv_get_target(lmv, op_data->op_mds, NULL);
1772                 if (IS_ERR(tgt))
1773                         return tgt;
1774
1775                 /* refill the right parent fid */
1776                 for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
1777                         struct lmv_oinfo *oinfo;
1778
1779                         oinfo = &lsm->lsm_md_oinfo[i];
1780                         if (oinfo->lmo_mds == op_data->op_mds) {
1781                                 *fid = oinfo->lmo_fid;
1782                                 break;
1783                         }
1784                 }
1785
1786                 /* Hmm, can not find the stripe by mdt_index(op_mds) */
1787                 if (i == lsm->lsm_md_stripe_count)
1788                         tgt = ERR_PTR(-EINVAL);
1789
1790                 return tgt;
1791         }
1792
1793         if (lsm == NULL || op_data->op_namelen == 0) {
1794                 tgt = lmv_find_target(lmv, fid);
1795                 if (IS_ERR(tgt))
1796                         return tgt;
1797
1798                 op_data->op_mds = tgt->ltd_idx;
1799                 return tgt;
1800         }
1801
1802         return lmv_locate_target_for_name(lmv, lsm, op_data->op_name,
1803                                           op_data->op_namelen, fid,
1804                                           &op_data->op_mds);
1805 }
1806
1807 int lmv_create(struct obd_export *exp, struct md_op_data *op_data,
1808                 const void *data, size_t datalen, umode_t mode, uid_t uid,
1809                 gid_t gid, cfs_cap_t cap_effective, __u64 rdev,
1810                 struct ptlrpc_request **request)
1811 {
1812         struct obd_device       *obd = exp->exp_obd;
1813         struct lmv_obd          *lmv = &obd->u.lmv;
1814         struct lmv_tgt_desc     *tgt;
1815         int                      rc;
1816         ENTRY;
1817
1818         rc = lmv_check_connect(obd);
1819         if (rc)
1820                 RETURN(rc);
1821
1822         if (!lmv->desc.ld_active_tgt_count)
1823                 RETURN(-EIO);
1824
1825         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1826         if (IS_ERR(tgt))
1827                 RETURN(PTR_ERR(tgt));
1828
1829         CDEBUG(D_INODE, "CREATE name '%.*s' on "DFID" -> mds #%x\n",
1830                 (int)op_data->op_namelen, op_data->op_name,
1831                 PFID(&op_data->op_fid1), op_data->op_mds);
1832
1833         rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
1834         if (rc)
1835                 RETURN(rc);
1836         if (exp_connect_flags(exp) & OBD_CONNECT_DIR_STRIPE) {
1837                 /* Send the create request to the MDT where the object
1838                  * will be located */
1839                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
1840                 if (IS_ERR(tgt))
1841                         RETURN(PTR_ERR(tgt));
1842
1843                 op_data->op_mds = tgt->ltd_idx;
1844         } else {
1845                 CDEBUG(D_CONFIG, "Server doesn't support striped dirs\n");
1846         }
1847
1848         CDEBUG(D_INODE, "CREATE obj "DFID" -> mds #%x\n",
1849                PFID(&op_data->op_fid2), op_data->op_mds);
1850
1851         op_data->op_flags |= MF_MDC_CANCEL_FID1;
1852         rc = md_create(tgt->ltd_exp, op_data, data, datalen, mode, uid, gid,
1853                        cap_effective, rdev, request);
1854         if (rc == 0) {
1855                 if (*request == NULL)
1856                         RETURN(rc);
1857                 CDEBUG(D_INODE, "Created - "DFID"\n", PFID(&op_data->op_fid2));
1858         }
1859         RETURN(rc);
1860 }
1861
1862 static int
1863 lmv_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1864             const union ldlm_policy_data *policy,
1865             struct lookup_intent *it, struct md_op_data *op_data,
1866             struct lustre_handle *lockh, __u64 extra_lock_flags)
1867 {
1868         struct obd_device        *obd = exp->exp_obd;
1869         struct lmv_obd           *lmv = &obd->u.lmv;
1870         struct lmv_tgt_desc      *tgt;
1871         int                       rc;
1872         ENTRY;
1873
1874         rc = lmv_check_connect(obd);
1875         if (rc)
1876                 RETURN(rc);
1877
1878         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID"\n",
1879                LL_IT2STR(it), PFID(&op_data->op_fid1));
1880
1881         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1882         if (IS_ERR(tgt))
1883                 RETURN(PTR_ERR(tgt));
1884
1885         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID" -> mds #%u\n",
1886                LL_IT2STR(it), PFID(&op_data->op_fid1), tgt->ltd_idx);
1887
1888         rc = md_enqueue(tgt->ltd_exp, einfo, policy, it, op_data, lockh,
1889                         extra_lock_flags);
1890
1891         RETURN(rc);
1892 }
1893
1894 static int
1895 lmv_getattr_name(struct obd_export *exp,struct md_op_data *op_data,
1896                  struct ptlrpc_request **preq)
1897 {
1898         struct ptlrpc_request   *req = NULL;
1899         struct obd_device       *obd = exp->exp_obd;
1900         struct lmv_obd          *lmv = &obd->u.lmv;
1901         struct lmv_tgt_desc     *tgt;
1902         struct mdt_body         *body;
1903         int                      rc;
1904         ENTRY;
1905
1906         rc = lmv_check_connect(obd);
1907         if (rc)
1908                 RETURN(rc);
1909
1910         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1911         if (IS_ERR(tgt))
1912                 RETURN(PTR_ERR(tgt));
1913
1914         CDEBUG(D_INODE, "GETATTR_NAME for %*s on "DFID" -> mds #%d\n",
1915                 (int)op_data->op_namelen, op_data->op_name,
1916                 PFID(&op_data->op_fid1), tgt->ltd_idx);
1917
1918         rc = md_getattr_name(tgt->ltd_exp, op_data, preq);
1919         if (rc != 0)
1920                 RETURN(rc);
1921
1922         body = req_capsule_server_get(&(*preq)->rq_pill, &RMF_MDT_BODY);
1923         LASSERT(body != NULL);
1924
1925         if (body->mbo_valid & OBD_MD_MDS) {
1926                 struct lu_fid rid = body->mbo_fid1;
1927                 CDEBUG(D_INODE, "Request attrs for "DFID"\n",
1928                        PFID(&rid));
1929
1930                 tgt = lmv_find_target(lmv, &rid);
1931                 if (IS_ERR(tgt)) {
1932                         ptlrpc_req_finished(*preq);
1933                         preq = NULL;
1934                         RETURN(PTR_ERR(tgt));
1935                 }
1936
1937                 op_data->op_fid1 = rid;
1938                 op_data->op_valid |= OBD_MD_FLCROSSREF;
1939                 op_data->op_namelen = 0;
1940                 op_data->op_name = NULL;
1941                 rc = md_getattr_name(tgt->ltd_exp, op_data, &req);
1942                 ptlrpc_req_finished(*preq);
1943                 *preq = req;
1944         }
1945
1946         RETURN(rc);
1947 }
1948
1949 #define md_op_data_fid(op_data, fl)                     \
1950         (fl == MF_MDC_CANCEL_FID1 ? &op_data->op_fid1 : \
1951          fl == MF_MDC_CANCEL_FID2 ? &op_data->op_fid2 : \
1952          fl == MF_MDC_CANCEL_FID3 ? &op_data->op_fid3 : \
1953          fl == MF_MDC_CANCEL_FID4 ? &op_data->op_fid4 : \
1954          NULL)
1955
1956 static int lmv_early_cancel(struct obd_export *exp, struct lmv_tgt_desc *tgt,
1957                             struct md_op_data *op_data,
1958                             __u32 op_tgt, ldlm_mode_t mode, int bits, int flag)
1959 {
1960         struct lu_fid          *fid = md_op_data_fid(op_data, flag);
1961         struct obd_device      *obd = exp->exp_obd;
1962         struct lmv_obd         *lmv = &obd->u.lmv;
1963         ldlm_policy_data_t      policy = {{ 0 }};
1964         int                     rc = 0;
1965         ENTRY;
1966
1967         if (!fid_is_sane(fid))
1968                 RETURN(0);
1969
1970         if (tgt == NULL) {
1971                 tgt = lmv_find_target(lmv, fid);
1972                 if (IS_ERR(tgt))
1973                         RETURN(PTR_ERR(tgt));
1974         }
1975
1976         if (tgt->ltd_idx != op_tgt) {
1977                 CDEBUG(D_INODE, "EARLY_CANCEL on "DFID"\n", PFID(fid));
1978                 policy.l_inodebits.bits = bits;
1979                 rc = md_cancel_unused(tgt->ltd_exp, fid, &policy,
1980                                       mode, LCF_ASYNC, NULL);
1981         } else {
1982                 CDEBUG(D_INODE,
1983                        "EARLY_CANCEL skip operation target %d on "DFID"\n",
1984                        op_tgt, PFID(fid));
1985                 op_data->op_flags |= flag;
1986                 rc = 0;
1987         }
1988
1989         RETURN(rc);
1990 }
1991
1992 /*
1993  * llite passes fid of an target inode in op_data->op_fid1 and id of directory in
1994  * op_data->op_fid2
1995  */
1996 static int lmv_link(struct obd_export *exp, struct md_op_data *op_data,
1997                     struct ptlrpc_request **request)
1998 {
1999         struct obd_device       *obd = exp->exp_obd;
2000         struct lmv_obd          *lmv = &obd->u.lmv;
2001         struct lmv_tgt_desc     *tgt;
2002         int                      rc;
2003         ENTRY;
2004
2005         rc = lmv_check_connect(obd);
2006         if (rc)
2007                 RETURN(rc);
2008
2009         LASSERT(op_data->op_namelen != 0);
2010
2011         CDEBUG(D_INODE, "LINK "DFID":%*s to "DFID"\n",
2012                PFID(&op_data->op_fid2), (int)op_data->op_namelen,
2013                op_data->op_name, PFID(&op_data->op_fid1));
2014
2015         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2016         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2017         op_data->op_cap = cfs_curproc_cap_pack();
2018         if (op_data->op_mea2 != NULL) {
2019                 struct lmv_stripe_md    *lsm = op_data->op_mea2;
2020                 const struct lmv_oinfo  *oinfo;
2021
2022                 oinfo = lsm_name_to_stripe_info(lsm, op_data->op_name,
2023                                                 op_data->op_namelen);
2024                 if (IS_ERR(oinfo))
2025                         RETURN(PTR_ERR(oinfo));
2026
2027                 op_data->op_fid2 = oinfo->lmo_fid;
2028         }
2029
2030         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid2);
2031         if (IS_ERR(tgt))
2032                 RETURN(PTR_ERR(tgt));
2033
2034         /*
2035          * Cancel UPDATE lock on child (fid1).
2036          */
2037         op_data->op_flags |= MF_MDC_CANCEL_FID2;
2038         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_idx, LCK_EX,
2039                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2040         if (rc != 0)
2041                 RETURN(rc);
2042
2043         rc = md_link(tgt->ltd_exp, op_data, request);
2044
2045         RETURN(rc);
2046 }
2047
2048 static int lmv_rename(struct obd_export *exp, struct md_op_data *op_data,
2049                       const char *old, size_t oldlen,
2050                       const char *new, size_t newlen,
2051                       struct ptlrpc_request **request)
2052 {
2053         struct obd_device       *obd = exp->exp_obd;
2054         struct lmv_obd          *lmv = &obd->u.lmv;
2055         struct lmv_tgt_desc     *src_tgt;
2056         int                     rc;
2057         ENTRY;
2058
2059         LASSERT(oldlen != 0);
2060
2061         CDEBUG(D_INODE, "RENAME %.*s in "DFID":%d to %.*s in "DFID":%d\n",
2062                (int)oldlen, old, PFID(&op_data->op_fid1),
2063                op_data->op_mea1 ? op_data->op_mea1->lsm_md_stripe_count : 0,
2064                (int)newlen, new, PFID(&op_data->op_fid2),
2065                op_data->op_mea2 ? op_data->op_mea2->lsm_md_stripe_count : 0);
2066
2067         rc = lmv_check_connect(obd);
2068         if (rc)
2069                 RETURN(rc);
2070
2071         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2072         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2073         op_data->op_cap = cfs_curproc_cap_pack();
2074         if (op_data->op_cli_flags & CLI_MIGRATE) {
2075                 LASSERTF(fid_is_sane(&op_data->op_fid3), "invalid FID "DFID"\n",
2076                          PFID(&op_data->op_fid3));
2077
2078                 if (op_data->op_mea1 != NULL) {
2079                         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2080                         struct lmv_tgt_desc     *tmp;
2081
2082                         /* Fix the parent fid for striped dir */
2083                         tmp = lmv_locate_target_for_name(lmv, lsm, old,
2084                                                          oldlen,
2085                                                          &op_data->op_fid1,
2086                                                          NULL);
2087                         if (IS_ERR(tmp))
2088                                 RETURN(PTR_ERR(tmp));
2089                 }
2090
2091                 rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
2092                 if (rc != 0)
2093                         RETURN(rc);
2094
2095                 src_tgt = lmv_find_target(lmv, &op_data->op_fid3);
2096         } else {
2097                 if (op_data->op_mea1 != NULL) {
2098                         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2099
2100                         src_tgt = lmv_locate_target_for_name(lmv, lsm, old,
2101                                                              oldlen,
2102                                                              &op_data->op_fid1,
2103                                                              &op_data->op_mds);
2104                         if (IS_ERR(src_tgt))
2105                                 RETURN(PTR_ERR(src_tgt));
2106                 } else {
2107                         src_tgt = lmv_find_target(lmv, &op_data->op_fid1);
2108                         if (IS_ERR(src_tgt))
2109                                 RETURN(PTR_ERR(src_tgt));
2110
2111                         op_data->op_mds = src_tgt->ltd_idx;
2112                 }
2113
2114                 if (op_data->op_mea2) {
2115                         struct lmv_stripe_md    *lsm = op_data->op_mea2;
2116                         const struct lmv_oinfo  *oinfo;
2117
2118                         oinfo = lsm_name_to_stripe_info(lsm, new, newlen);
2119                         if (IS_ERR(oinfo))
2120                                 RETURN(PTR_ERR(oinfo));
2121
2122                         op_data->op_fid2 = oinfo->lmo_fid;
2123                 }
2124         }
2125         if (IS_ERR(src_tgt))
2126                 RETURN(PTR_ERR(src_tgt));
2127
2128         /*
2129          * LOOKUP lock on src child (fid3) should also be cancelled for
2130          * src_tgt in mdc_rename.
2131          */
2132         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2133
2134         /*
2135          * Cancel UPDATE locks on tgt parent (fid2), tgt_tgt is its
2136          * own target.
2137          */
2138         rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2139                               LCK_EX, MDS_INODELOCK_UPDATE,
2140                               MF_MDC_CANCEL_FID2);
2141
2142         if (rc != 0)
2143                 RETURN(rc);
2144         /*
2145          * Cancel LOOKUP locks on source child (fid3) for parent tgt_tgt.
2146          */
2147         if (fid_is_sane(&op_data->op_fid3)) {
2148                 struct lmv_tgt_desc *tgt;
2149
2150                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
2151                 if (IS_ERR(tgt))
2152                         RETURN(PTR_ERR(tgt));
2153
2154                 /* Cancel LOOKUP lock on its parent */
2155                 rc = lmv_early_cancel(exp, tgt, op_data, src_tgt->ltd_idx,
2156                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2157                                       MF_MDC_CANCEL_FID3);
2158                 if (rc != 0)
2159                         RETURN(rc);
2160
2161                 rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2162                                       LCK_EX, MDS_INODELOCK_FULL,
2163                                       MF_MDC_CANCEL_FID3);
2164                 if (rc != 0)
2165                         RETURN(rc);
2166         }
2167
2168         /*
2169          * Cancel all the locks on tgt child (fid4).
2170          */
2171         if (fid_is_sane(&op_data->op_fid4))
2172                 rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2173                                       LCK_EX, MDS_INODELOCK_FULL,
2174                                       MF_MDC_CANCEL_FID4);
2175
2176         CDEBUG(D_INODE, DFID":m%d to "DFID"\n", PFID(&op_data->op_fid1),
2177                op_data->op_mds, PFID(&op_data->op_fid2));
2178
2179         rc = md_rename(src_tgt->ltd_exp, op_data, old, oldlen, new, newlen,
2180                        request);
2181
2182         RETURN(rc);
2183 }
2184
2185 static int lmv_setattr(struct obd_export *exp, struct md_op_data *op_data,
2186                        void *ea, size_t ealen, struct ptlrpc_request **request)
2187 {
2188         struct obd_device       *obd = exp->exp_obd;
2189         struct lmv_obd          *lmv = &obd->u.lmv;
2190         struct lmv_tgt_desc     *tgt;
2191         int                      rc = 0;
2192         ENTRY;
2193
2194         rc = lmv_check_connect(obd);
2195         if (rc)
2196                 RETURN(rc);
2197
2198         CDEBUG(D_INODE, "SETATTR for "DFID", valid 0x%x\n",
2199                PFID(&op_data->op_fid1), op_data->op_attr.ia_valid);
2200
2201         op_data->op_flags |= MF_MDC_CANCEL_FID1;
2202         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2203         if (IS_ERR(tgt))
2204                 RETURN(PTR_ERR(tgt));
2205
2206         rc = md_setattr(tgt->ltd_exp, op_data, ea, ealen, request);
2207
2208         RETURN(rc);
2209 }
2210
2211 static int lmv_fsync(struct obd_export *exp, const struct lu_fid *fid,
2212                      struct obd_capa *oc, struct ptlrpc_request **request)
2213 {
2214         struct obd_device       *obd = exp->exp_obd;
2215         struct lmv_obd          *lmv = &obd->u.lmv;
2216         struct lmv_tgt_desc     *tgt;
2217         int                      rc;
2218         ENTRY;
2219
2220         rc = lmv_check_connect(obd);
2221         if (rc != 0)
2222                 RETURN(rc);
2223
2224         tgt = lmv_find_target(lmv, fid);
2225         if (IS_ERR(tgt))
2226                 RETURN(PTR_ERR(tgt));
2227
2228         rc = md_fsync(tgt->ltd_exp, fid, oc, request);
2229         RETURN(rc);
2230 }
2231
2232 /**
2233  * Get current minimum entry from striped directory
2234  *
2235  * This function will search the dir entry, whose hash value is the
2236  * closest(>=) to @hash_offset, from all of sub-stripes, and it is
2237  * only being called for striped directory.
2238  *
2239  * \param[in] exp               export of LMV
2240  * \param[in] op_data           parameters transferred beween client MD stack
2241  *                              stripe_information will be included in this
2242  *                              parameter
2243  * \param[in] cb_op             ldlm callback being used in enqueue in
2244  *                              mdc_read_page
2245  * \param[in] hash_offset       the hash value, which is used to locate
2246  *                              minum(closet) dir entry
2247  * \param[in|out] stripe_offset the caller use this to indicate the stripe
2248  *                              index of last entry, so to avoid hash conflict
2249  *                              between stripes. It will also be used to
2250  *                              return the stripe index of current dir entry.
2251  * \param[in|out] entp          the minum entry and it also is being used
2252  *                              to input the last dir entry to resolve the
2253  *                              hash conflict
2254  *
2255  * \param[out] ppage            the page which holds the minum entry
2256  *
2257  * \retval                      = 0 get the entry successfully
2258  *                              negative errno (< 0) does not get the entry
2259  */
2260 static int lmv_get_min_striped_entry(struct obd_export *exp,
2261                                      struct md_op_data *op_data,
2262                                      struct md_callback *cb_op,
2263                                      __u64 hash_offset, int *stripe_offset,
2264                                      struct lu_dirent **entp,
2265                                      struct page **ppage)
2266 {
2267         struct obd_device       *obd = exp->exp_obd;
2268         struct lmv_obd          *lmv = &obd->u.lmv;
2269         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2270         struct lmv_tgt_desc     *tgt;
2271         int                     stripe_count;
2272         struct lu_dirent        *min_ent = NULL;
2273         struct page             *min_page = NULL;
2274         int                     min_idx = 0;
2275         int                     i;
2276         int                     rc = 0;
2277         ENTRY;
2278
2279         stripe_count = lsm->lsm_md_stripe_count;
2280         for (i = 0; i < stripe_count; i++) {
2281                 struct lu_dirent        *ent = NULL;
2282                 struct page             *page = NULL;
2283                 struct lu_dirpage       *dp;
2284                 __u64                   stripe_hash = hash_offset;
2285
2286                 tgt = lmv_get_target(lmv, lsm->lsm_md_oinfo[i].lmo_mds, NULL);
2287                 if (IS_ERR(tgt))
2288                         GOTO(out, rc = PTR_ERR(tgt));
2289
2290                 /* op_data will be shared by each stripe, so we need
2291                  * reset these value for each stripe */
2292                 op_data->op_fid1 = lsm->lsm_md_oinfo[i].lmo_fid;
2293                 op_data->op_fid2 = lsm->lsm_md_oinfo[i].lmo_fid;
2294                 op_data->op_data = lsm->lsm_md_oinfo[i].lmo_root;
2295 next:
2296                 rc = md_read_page(tgt->ltd_exp, op_data, cb_op, stripe_hash,
2297                                   &page);
2298                 if (rc != 0)
2299                         GOTO(out, rc);
2300
2301                 dp = page_address(page);
2302                 for (ent = lu_dirent_start(dp); ent != NULL;
2303                      ent = lu_dirent_next(ent)) {
2304                         /* Skip dummy entry */
2305                         if (le16_to_cpu(ent->lde_namelen) == 0)
2306                                 continue;
2307
2308                         if (le64_to_cpu(ent->lde_hash) < hash_offset)
2309                                 continue;
2310
2311                         if (le64_to_cpu(ent->lde_hash) == hash_offset &&
2312                             (*entp == ent || i < *stripe_offset))
2313                                 continue;
2314
2315                         /* skip . and .. for other stripes */
2316                         if (i != 0 &&
2317                             (strncmp(ent->lde_name, ".",
2318                                      le16_to_cpu(ent->lde_namelen)) == 0 ||
2319                              strncmp(ent->lde_name, "..",
2320                                      le16_to_cpu(ent->lde_namelen)) == 0))
2321                                 continue;
2322                         break;
2323                 }
2324
2325                 if (ent == NULL) {
2326                         stripe_hash = le64_to_cpu(dp->ldp_hash_end);
2327
2328                         kunmap(page);
2329                         page_cache_release(page);
2330                         page = NULL;
2331
2332                         /* reach the end of current stripe, go to next stripe */
2333                         if (stripe_hash == MDS_DIR_END_OFF)
2334                                 continue;
2335                         else
2336                                 goto next;
2337                 }
2338
2339                 if (min_ent != NULL) {
2340                         if (le64_to_cpu(min_ent->lde_hash) >
2341                             le64_to_cpu(ent->lde_hash)) {
2342                                 min_ent = ent;
2343                                 kunmap(min_page);
2344                                 page_cache_release(min_page);
2345                                 min_idx = i;
2346                                 min_page = page;
2347                         } else {
2348                                 kunmap(page);
2349                                 page_cache_release(page);
2350                                 page = NULL;
2351                         }
2352                 } else {
2353                         min_ent = ent;
2354                         min_page = page;
2355                         min_idx = i;
2356                 }
2357         }
2358
2359 out:
2360         if (*ppage != NULL) {
2361                 kunmap(*ppage);
2362                 page_cache_release(*ppage);
2363         }
2364         *stripe_offset = min_idx;
2365         *entp = min_ent;
2366         *ppage = min_page;
2367         RETURN(rc);
2368 }
2369
2370 /**
2371  * Build dir entry page from a striped directory
2372  *
2373  * This function gets one entry by @offset from a striped directory. It will
2374  * read entries from all of stripes, and choose one closest to the required
2375  * offset(&offset). A few notes
2376  * 1. skip . and .. for non-zero stripes, because there can only have one .
2377  * and .. in a directory.
2378  * 2. op_data will be shared by all of stripes, instead of allocating new
2379  * one, so need to restore before reusing.
2380  * 3. release the entry page if that is not being chosen.
2381  *
2382  * \param[in] exp       obd export refer to LMV
2383  * \param[in] op_data   hold those MD parameters of read_entry
2384  * \param[in] cb_op     ldlm callback being used in enqueue in mdc_read_entry
2385  * \param[out] ldp      the entry being read
2386  * \param[out] ppage    the page holding the entry. Note: because the entry
2387  *                      will be accessed in upper layer, so we need hold the
2388  *                      page until the usages of entry is finished, see
2389  *                      ll_dir_entry_next.
2390  *
2391  * retval               =0 if get entry successfully
2392  *                      <0 cannot get entry
2393  */
2394 static int lmv_read_striped_page(struct obd_export *exp,
2395                                  struct md_op_data *op_data,
2396                                  struct md_callback *cb_op,
2397                                  __u64 offset, struct page **ppage)
2398 {
2399         struct obd_device       *obd = exp->exp_obd;
2400         struct lu_fid           master_fid = op_data->op_fid1;
2401         struct inode            *master_inode = op_data->op_data;
2402         __u64                   hash_offset = offset;
2403         struct lu_dirpage       *dp;
2404         struct page             *min_ent_page = NULL;
2405         struct page             *ent_page = NULL;
2406         struct lu_dirent        *ent;
2407         void                    *area;
2408         int                     ent_idx = 0;
2409         struct lu_dirent        *min_ent = NULL;
2410         struct lu_dirent        *last_ent;
2411         size_t                  left_bytes;
2412         int                     rc;
2413         ENTRY;
2414
2415         rc = lmv_check_connect(obd);
2416         if (rc)
2417                 RETURN(rc);
2418
2419         /* Allocate a page and read entries from all of stripes and fill
2420          * the page by hash order */
2421         ent_page = alloc_page(GFP_KERNEL);
2422         if (ent_page == NULL)
2423                 RETURN(-ENOMEM);
2424
2425         /* Initialize the entry page */
2426         dp = kmap(ent_page);
2427         memset(dp, 0, sizeof(*dp));
2428         dp->ldp_hash_start = cpu_to_le64(offset);
2429         dp->ldp_flags |= LDF_COLLIDE;
2430
2431         area = dp + 1;
2432         left_bytes = PAGE_CACHE_SIZE - sizeof(*dp);
2433         ent = area;
2434         last_ent = ent;
2435         do {
2436                 __u16   ent_size;
2437
2438                 /* Find the minum entry from all sub-stripes */
2439                 rc = lmv_get_min_striped_entry(exp, op_data, cb_op, hash_offset,
2440                                                &ent_idx, &min_ent,
2441                                                &min_ent_page);
2442                 if (rc != 0)
2443                         GOTO(out, rc);
2444
2445                 /* If it can not get minum entry, it means it already reaches
2446                  * the end of this directory */
2447                 if (min_ent == NULL) {
2448                         last_ent->lde_reclen = 0;
2449                         hash_offset = MDS_DIR_END_OFF;
2450                         GOTO(out, rc);
2451                 }
2452
2453                 ent_size = le16_to_cpu(min_ent->lde_reclen);
2454
2455                 /* the last entry lde_reclen is 0, but it might not
2456                  * the end of this entry of this temporay entry */
2457                 if (ent_size == 0)
2458                         ent_size = lu_dirent_calc_size(
2459                                         le16_to_cpu(min_ent->lde_namelen),
2460                                         le32_to_cpu(min_ent->lde_attrs));
2461                 if (ent_size > left_bytes) {
2462                         last_ent->lde_reclen = cpu_to_le16(0);
2463                         hash_offset = le64_to_cpu(min_ent->lde_hash);
2464                         GOTO(out, rc);
2465                 }
2466
2467                 memcpy(ent, min_ent, ent_size);
2468
2469                 /* Replace . with master FID and Replace .. with the parent FID
2470                  * of master object */
2471                 if (strncmp(ent->lde_name, ".",
2472                             le16_to_cpu(ent->lde_namelen)) == 0 &&
2473                     le16_to_cpu(ent->lde_namelen) == 1)
2474                         fid_cpu_to_le(&ent->lde_fid, &master_fid);
2475                 else if (strncmp(ent->lde_name, "..",
2476                                    le16_to_cpu(ent->lde_namelen)) == 0 &&
2477                            le16_to_cpu(ent->lde_namelen) == 2)
2478                         fid_cpu_to_le(&ent->lde_fid, &op_data->op_fid3);
2479
2480                 left_bytes -= ent_size;
2481                 ent->lde_reclen = cpu_to_le16(ent_size);
2482                 last_ent = ent;
2483                 ent = (void *)ent + ent_size;
2484                 hash_offset = le64_to_cpu(min_ent->lde_hash);
2485                 if (hash_offset == MDS_DIR_END_OFF) {
2486                         last_ent->lde_reclen = 0;
2487                         break;
2488                 }
2489         } while (1);
2490 out:
2491         if (min_ent_page != NULL) {
2492                 kunmap(min_ent_page);
2493                 page_cache_release(min_ent_page);
2494         }
2495
2496         if (unlikely(rc != 0)) {
2497                 __free_page(ent_page);
2498                 ent_page = NULL;
2499         } else {
2500                 if (ent == area)
2501                         dp->ldp_flags |= LDF_EMPTY;
2502                 dp->ldp_flags = cpu_to_le32(dp->ldp_flags);
2503                 dp->ldp_hash_end = cpu_to_le64(hash_offset);
2504         }
2505
2506         /* We do not want to allocate md_op_data during each
2507          * dir entry reading, so op_data will be shared by every stripe,
2508          * then we need to restore it back to original value before
2509          * return to the upper layer */
2510         op_data->op_fid1 = master_fid;
2511         op_data->op_fid2 = master_fid;
2512         op_data->op_data = master_inode;
2513
2514         *ppage = ent_page;
2515
2516         RETURN(rc);
2517 }
2518
2519 int lmv_read_page(struct obd_export *exp, struct md_op_data *op_data,
2520                   struct md_callback *cb_op, __u64 offset,
2521                   struct page **ppage)
2522 {
2523         struct obd_device       *obd = exp->exp_obd;
2524         struct lmv_obd          *lmv = &obd->u.lmv;
2525         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2526         struct lmv_tgt_desc     *tgt;
2527         int                     rc;
2528         ENTRY;
2529
2530         rc = lmv_check_connect(obd);
2531         if (rc != 0)
2532                 RETURN(rc);
2533
2534         if (unlikely(lsm != NULL)) {
2535                 rc = lmv_read_striped_page(exp, op_data, cb_op, offset, ppage);
2536                 RETURN(rc);
2537         }
2538
2539         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2540         if (IS_ERR(tgt))
2541                 RETURN(PTR_ERR(tgt));
2542
2543         rc = md_read_page(tgt->ltd_exp, op_data, cb_op, offset, ppage);
2544
2545         RETURN(rc);
2546 }
2547
2548 /**
2549  * Unlink a file/directory
2550  *
2551  * Unlink a file or directory under the parent dir. The unlink request
2552  * usually will be sent to the MDT where the child is located, but if
2553  * the client does not have the child FID then request will be sent to the
2554  * MDT where the parent is located.
2555  *
2556  * If the parent is a striped directory then it also needs to locate which
2557  * stripe the name of the child is located, and replace the parent FID
2558  * (@op->op_fid1) with the stripe FID. Note: if the stripe is unknown,
2559  * it will walk through all of sub-stripes until the child is being
2560  * unlinked finally.
2561  *
2562  * \param[in] exp       export refer to LMV
2563  * \param[in] op_data   different parameters transferred beween client
2564  *                      MD stacks, name, namelen, FIDs etc.
2565  *                      op_fid1 is the parent FID, op_fid2 is the child
2566  *                      FID.
2567  * \param[out] request  point to the request of unlink.
2568  *
2569  * retval               0 if succeed
2570  *                      negative errno if failed.
2571  */
2572 static int lmv_unlink(struct obd_export *exp, struct md_op_data *op_data,
2573                       struct ptlrpc_request **request)
2574 {
2575         struct obd_device       *obd = exp->exp_obd;
2576         struct lmv_obd          *lmv = &obd->u.lmv;
2577         struct lmv_tgt_desc     *tgt = NULL;
2578         struct lmv_tgt_desc     *parent_tgt = NULL;
2579         struct mdt_body         *body;
2580         int                     rc;
2581         int                     stripe_index = 0;
2582         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2583         ENTRY;
2584
2585         rc = lmv_check_connect(obd);
2586         if (rc)
2587                 RETURN(rc);
2588 retry_unlink:
2589         /* For striped dir, we need to locate the parent as well */
2590         if (lsm != NULL) {
2591                 struct lmv_tgt_desc *tmp;
2592
2593                 LASSERT(op_data->op_name != NULL &&
2594                         op_data->op_namelen != 0);
2595
2596                 tmp = lmv_locate_target_for_name(lmv, lsm,
2597                                                  op_data->op_name,
2598                                                  op_data->op_namelen,
2599                                                  &op_data->op_fid1,
2600                                                  &op_data->op_mds);
2601
2602                 /* return -EBADFD means unknown hash type, might
2603                  * need try all sub-stripe here */
2604                 if (IS_ERR(tmp) && PTR_ERR(tmp) != -EBADFD)
2605                         RETURN(PTR_ERR(tmp));
2606
2607                 /* Note: both migrating dir and unknown hash dir need to
2608                  * try all of sub-stripes, so we need start search the
2609                  * name from stripe 0, but migrating dir is already handled
2610                  * inside lmv_locate_target_for_name(), so we only check
2611                  * unknown hash type directory here */
2612                 if (!lmv_is_known_hash_type(lsm->lsm_md_hash_type)) {
2613                         struct lmv_oinfo *oinfo;
2614
2615                         oinfo = &lsm->lsm_md_oinfo[stripe_index];
2616
2617                         op_data->op_fid1 = oinfo->lmo_fid;
2618                         op_data->op_mds = oinfo->lmo_mds;
2619                 }
2620         }
2621
2622 try_next_stripe:
2623         /* Send unlink requests to the MDT where the child is located */
2624         if (likely(!fid_is_zero(&op_data->op_fid2)))
2625                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
2626         else if (lsm != NULL)
2627                 tgt = lmv_get_target(lmv, op_data->op_mds, NULL);
2628         else
2629                 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
2630
2631         if (IS_ERR(tgt))
2632                 RETURN(PTR_ERR(tgt));
2633
2634         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2635         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2636         op_data->op_cap = cfs_curproc_cap_pack();
2637
2638         /*
2639          * If child's fid is given, cancel unused locks for it if it is from
2640          * another export than parent.
2641          *
2642          * LOOKUP lock for child (fid3) should also be cancelled on parent
2643          * tgt_tgt in mdc_unlink().
2644          */
2645         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2646
2647         /*
2648          * Cancel FULL locks on child (fid3).
2649          */
2650         parent_tgt = lmv_find_target(lmv, &op_data->op_fid1);
2651         if (IS_ERR(parent_tgt))
2652                 RETURN(PTR_ERR(parent_tgt));
2653
2654         if (parent_tgt != tgt) {
2655                 rc = lmv_early_cancel(exp, parent_tgt, op_data, tgt->ltd_idx,
2656                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2657                                       MF_MDC_CANCEL_FID3);
2658         }
2659
2660         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_idx, LCK_EX,
2661                               MDS_INODELOCK_FULL, MF_MDC_CANCEL_FID3);
2662         if (rc != 0)
2663                 RETURN(rc);
2664
2665         CDEBUG(D_INODE, "unlink with fid="DFID"/"DFID" -> mds #%u\n",
2666                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2), tgt->ltd_idx);
2667
2668         rc = md_unlink(tgt->ltd_exp, op_data, request);
2669         if (rc != 0 && rc != -EREMOTE && rc != -ENOENT)
2670                 RETURN(rc);
2671
2672         /* Try next stripe if it is needed. */
2673         if (rc == -ENOENT && lsm != NULL && lmv_need_try_all_stripes(lsm)) {
2674                 struct lmv_oinfo *oinfo;
2675
2676                 stripe_index++;
2677                 if (stripe_index >= lsm->lsm_md_stripe_count)
2678                         RETURN(rc);
2679
2680                 oinfo = &lsm->lsm_md_oinfo[stripe_index];
2681
2682                 op_data->op_fid1 = oinfo->lmo_fid;
2683                 op_data->op_mds = oinfo->lmo_mds;
2684
2685                 ptlrpc_req_finished(*request);
2686                 *request = NULL;
2687
2688                 goto try_next_stripe;
2689         }
2690
2691         body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
2692         if (body == NULL)
2693                 RETURN(-EPROTO);
2694
2695         /* Not cross-ref case, just get out of here. */
2696         if (likely(!(body->mbo_valid & OBD_MD_MDS)))
2697                 RETURN(rc);
2698
2699         CDEBUG(D_INODE, "%s: try unlink to another MDT for "DFID"\n",
2700                exp->exp_obd->obd_name, PFID(&body->mbo_fid1));
2701
2702         /* This is a remote object, try remote MDT, Note: it may
2703          * try more than 1 time here, Considering following case
2704          * /mnt/lustre is root on MDT0, remote1 is on MDT1
2705          * 1. Initially A does not know where remote1 is, it send
2706          *    unlink RPC to MDT0, MDT0 return -EREMOTE, it will
2707          *    resend unlink RPC to MDT1 (retry 1st time).
2708          *
2709          * 2. During the unlink RPC in flight,
2710          *    client B mv /mnt/lustre/remote1 /mnt/lustre/remote2
2711          *    and create new remote1, but on MDT0
2712          *
2713          * 3. MDT1 get unlink RPC(from A), then do remote lock on
2714          *    /mnt/lustre, then lookup get fid of remote1, and find
2715          *    it is remote dir again, and replay -EREMOTE again.
2716          *
2717          * 4. Then A will resend unlink RPC to MDT0. (retry 2nd times).
2718          *
2719          * In theory, it might try unlimited time here, but it should
2720          * be very rare case.  */
2721         op_data->op_fid2 = body->mbo_fid1;
2722         ptlrpc_req_finished(*request);
2723         *request = NULL;
2724
2725         goto retry_unlink;
2726 }
2727
2728 static int lmv_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
2729 {
2730         struct lmv_obd *lmv = &obd->u.lmv;
2731         int rc = 0;
2732
2733         switch (stage) {
2734         case OBD_CLEANUP_EARLY:
2735                 /* XXX: here should be calling obd_precleanup() down to
2736                  * stack. */
2737                 break;
2738         case OBD_CLEANUP_EXPORTS:
2739                 fld_client_proc_fini(&lmv->lmv_fld);
2740                 lprocfs_obd_cleanup(obd);
2741                 lprocfs_free_md_stats(obd);
2742                 break;
2743         default:
2744                 break;
2745         }
2746         RETURN(rc);
2747 }
2748
2749 /**
2750  * Get by key a value associated with a LMV device.
2751  *
2752  * Dispatch request to lower-layer devices as needed.
2753  *
2754  * \param[in] env               execution environment for this thread
2755  * \param[in] exp               export for the LMV device
2756  * \param[in] keylen            length of key identifier
2757  * \param[in] key               identifier of key to get value for
2758  * \param[in] vallen            size of \a val
2759  * \param[out] val              pointer to storage location for value
2760  * \param[in] lsm               optional striping metadata of object
2761  *
2762  * \retval 0            on success
2763  * \retval negative     negated errno on failure
2764  */
2765 static int lmv_get_info(const struct lu_env *env, struct obd_export *exp,
2766                         __u32 keylen, void *key, __u32 *vallen, void *val,
2767                         struct lov_stripe_md *lsm)
2768 {
2769         struct obd_device       *obd;
2770         struct lmv_obd          *lmv;
2771         int                      rc = 0;
2772         ENTRY;
2773
2774         obd = class_exp2obd(exp);
2775         if (obd == NULL) {
2776                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2777                        exp->exp_handle.h_cookie);
2778                 RETURN(-EINVAL);
2779         }
2780
2781         lmv = &obd->u.lmv;
2782         if (keylen >= strlen("remote_flag") && !strcmp(key, "remote_flag")) {
2783                 int i;
2784
2785                 rc = lmv_check_connect(obd);
2786                 if (rc)
2787                         RETURN(rc);
2788
2789                 LASSERT(*vallen == sizeof(__u32));
2790                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2791                         struct lmv_tgt_desc *tgt = lmv->tgts[i];
2792                         /*
2793                          * All tgts should be connected when this gets called.
2794                          */
2795                         if (tgt == NULL || tgt->ltd_exp == NULL)
2796                                 continue;
2797
2798                         if (!obd_get_info(env, tgt->ltd_exp, keylen, key,
2799                                           vallen, val, NULL))
2800                                 RETURN(0);
2801                 }
2802                 RETURN(-EINVAL);
2803         } else if (KEY_IS(KEY_MAX_EASIZE) ||
2804                    KEY_IS(KEY_DEFAULT_EASIZE) ||
2805                    KEY_IS(KEY_MAX_COOKIESIZE) ||
2806                    KEY_IS(KEY_DEFAULT_COOKIESIZE) ||
2807                    KEY_IS(KEY_CONN_DATA)) {
2808                 rc = lmv_check_connect(obd);
2809                 if (rc)
2810                         RETURN(rc);
2811
2812                 /*
2813                  * Forwarding this request to first MDS, it should know LOV
2814                  * desc.
2815                  */
2816                 rc = obd_get_info(env, lmv->tgts[0]->ltd_exp, keylen, key,
2817                                   vallen, val, NULL);
2818                 if (!rc && KEY_IS(KEY_CONN_DATA))
2819                         exp->exp_connect_data = *(struct obd_connect_data *)val;
2820                 RETURN(rc);
2821         } else if (KEY_IS(KEY_TGT_COUNT)) {
2822                 *((int *)val) = lmv->desc.ld_tgt_count;
2823                 RETURN(0);
2824         }
2825
2826         CDEBUG(D_IOCTL, "Invalid key\n");
2827         RETURN(-EINVAL);
2828 }
2829
2830 /**
2831  * Asynchronously set by key a value associated with a LMV device.
2832  *
2833  * Dispatch request to lower-layer devices as needed.
2834  *
2835  * \param[in] env       execution environment for this thread
2836  * \param[in] exp       export for the LMV device
2837  * \param[in] keylen    length of key identifier
2838  * \param[in] key       identifier of key to store value for
2839  * \param[in] vallen    size of value to store
2840  * \param[in] val       pointer to data to be stored
2841  * \param[in] set       optional list of related ptlrpc requests
2842  *
2843  * \retval 0            on success
2844  * \retval negative     negated errno on failure
2845  */
2846 int lmv_set_info_async(const struct lu_env *env, struct obd_export *exp,
2847                         __u32 keylen, void *key, __u32 vallen, void *val,
2848                         struct ptlrpc_request_set *set)
2849 {
2850         struct lmv_tgt_desc     *tgt = NULL;
2851         struct obd_device       *obd;
2852         struct lmv_obd          *lmv;
2853         int rc = 0;
2854         ENTRY;
2855
2856         obd = class_exp2obd(exp);
2857         if (obd == NULL) {
2858                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2859                        exp->exp_handle.h_cookie);
2860                 RETURN(-EINVAL);
2861         }
2862         lmv = &obd->u.lmv;
2863
2864         if (KEY_IS(KEY_READ_ONLY) || KEY_IS(KEY_FLUSH_CTX) ||
2865             KEY_IS(KEY_DEFAULT_EASIZE)) {
2866                 int i, err = 0;
2867
2868                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2869                         tgt = lmv->tgts[i];
2870
2871                         if (tgt == NULL || tgt->ltd_exp == NULL)
2872                                 continue;
2873
2874                         err = obd_set_info_async(env, tgt->ltd_exp,
2875                                                  keylen, key, vallen, val, set);
2876                         if (err && rc == 0)
2877                                 rc = err;
2878                 }
2879
2880                 RETURN(rc);
2881         }
2882
2883         RETURN(-EINVAL);
2884 }
2885
2886 static int lmv_pack_md_v1(const struct lmv_stripe_md *lsm,
2887                           struct lmv_mds_md_v1 *lmm1)
2888 {
2889         int     cplen;
2890         int     i;
2891
2892         lmm1->lmv_magic = cpu_to_le32(lsm->lsm_md_magic);
2893         lmm1->lmv_stripe_count = cpu_to_le32(lsm->lsm_md_stripe_count);
2894         lmm1->lmv_master_mdt_index = cpu_to_le32(lsm->lsm_md_master_mdt_index);
2895         lmm1->lmv_hash_type = cpu_to_le32(lsm->lsm_md_hash_type);
2896         cplen = strlcpy(lmm1->lmv_pool_name, lsm->lsm_md_pool_name,
2897                         sizeof(lmm1->lmv_pool_name));
2898         if (cplen >= sizeof(lmm1->lmv_pool_name))
2899                 return -E2BIG;
2900
2901         for (i = 0; i < lsm->lsm_md_stripe_count; i++)
2902                 fid_cpu_to_le(&lmm1->lmv_stripe_fids[i],
2903                               &lsm->lsm_md_oinfo[i].lmo_fid);
2904         return 0;
2905 }
2906
2907 int lmv_pack_md(union lmv_mds_md **lmmp, const struct lmv_stripe_md *lsm,
2908                 int stripe_count)
2909 {
2910         int     lmm_size = 0;
2911         bool    allocated = false;
2912         int     rc = 0;
2913         ENTRY;
2914
2915         LASSERT(lmmp != NULL);
2916         /* Free lmm */
2917         if (*lmmp != NULL && lsm == NULL) {
2918                 int stripe_count;
2919
2920                 stripe_count = lmv_mds_md_stripe_count_get(*lmmp);
2921                 lmm_size = lmv_mds_md_size(stripe_count,
2922                                            le32_to_cpu((*lmmp)->lmv_magic));
2923                 if (lmm_size == 0)
2924                         RETURN(-EINVAL);
2925                 OBD_FREE(*lmmp, lmm_size);
2926                 *lmmp = NULL;
2927                 RETURN(0);
2928         }
2929
2930         /* Alloc lmm */
2931         if (*lmmp == NULL && lsm == NULL) {
2932                 lmm_size = lmv_mds_md_size(stripe_count, LMV_MAGIC);
2933                 LASSERT(lmm_size > 0);
2934                 OBD_ALLOC(*lmmp, lmm_size);
2935                 if (*lmmp == NULL)
2936                         RETURN(-ENOMEM);
2937                 lmv_mds_md_stripe_count_set(*lmmp, stripe_count);
2938                 (*lmmp)->lmv_magic = cpu_to_le32(LMV_MAGIC);
2939                 RETURN(lmm_size);
2940         }
2941
2942         /* pack lmm */
2943         LASSERT(lsm != NULL);
2944         lmm_size = lmv_mds_md_size(lsm->lsm_md_stripe_count, lsm->lsm_md_magic);
2945         if (*lmmp == NULL) {
2946                 OBD_ALLOC(*lmmp, lmm_size);
2947                 if (*lmmp == NULL)
2948                         RETURN(-ENOMEM);
2949                 allocated = true;
2950         }
2951
2952         switch (lsm->lsm_md_magic) {
2953         case LMV_MAGIC_V1:
2954                 rc = lmv_pack_md_v1(lsm, &(*lmmp)->lmv_md_v1);
2955                 break;
2956         default:
2957                 rc = -EINVAL;
2958                 break;
2959         }
2960
2961         if (rc != 0 && allocated) {
2962                 OBD_FREE(*lmmp, lmm_size);
2963                 *lmmp = NULL;
2964         }
2965
2966         RETURN(lmm_size);
2967 }
2968
2969 static int lmv_unpack_md_v1(struct obd_export *exp, struct lmv_stripe_md *lsm,
2970                             const struct lmv_mds_md_v1 *lmm1)
2971 {
2972         struct lmv_obd  *lmv = &exp->exp_obd->u.lmv;
2973         int             stripe_count;
2974         int             cplen;
2975         int             i;
2976         int             rc = 0;
2977         ENTRY;
2978
2979         lsm->lsm_md_magic = le32_to_cpu(lmm1->lmv_magic);
2980         lsm->lsm_md_stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
2981         lsm->lsm_md_master_mdt_index = le32_to_cpu(lmm1->lmv_master_mdt_index);
2982         if (OBD_FAIL_CHECK(OBD_FAIL_UNKNOWN_LMV_STRIPE))
2983                 lsm->lsm_md_hash_type = LMV_HASH_TYPE_UNKNOWN;
2984         else
2985                 lsm->lsm_md_hash_type = le32_to_cpu(lmm1->lmv_hash_type);
2986         lsm->lsm_md_layout_version = le32_to_cpu(lmm1->lmv_layout_version);
2987         cplen = strlcpy(lsm->lsm_md_pool_name, lmm1->lmv_pool_name,
2988                         sizeof(lsm->lsm_md_pool_name));
2989
2990         if (cplen >= sizeof(lsm->lsm_md_pool_name))
2991                 RETURN(-E2BIG);
2992
2993         CDEBUG(D_INFO, "unpack lsm count %d, master %d hash_type %d"
2994                "layout_version %d\n", lsm->lsm_md_stripe_count,
2995                lsm->lsm_md_master_mdt_index, lsm->lsm_md_hash_type,
2996                lsm->lsm_md_layout_version);
2997
2998         stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
2999         for (i = 0; i < stripe_count; i++) {
3000                 fid_le_to_cpu(&lsm->lsm_md_oinfo[i].lmo_fid,
3001                               &lmm1->lmv_stripe_fids[i]);
3002                 rc = lmv_fld_lookup(lmv, &lsm->lsm_md_oinfo[i].lmo_fid,
3003                                     &lsm->lsm_md_oinfo[i].lmo_mds);
3004                 if (rc != 0)
3005                         RETURN(rc);
3006                 CDEBUG(D_INFO, "unpack fid #%d "DFID"\n", i,
3007                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid));
3008         }
3009
3010         RETURN(rc);
3011 }
3012
3013 int lmv_unpack_md(struct obd_export *exp, struct lmv_stripe_md **lsmp,
3014                   const union lmv_mds_md *lmm, int stripe_count)
3015 {
3016         struct lmv_stripe_md     *lsm;
3017         int                      lsm_size;
3018         int                      rc;
3019         bool                     allocated = false;
3020         ENTRY;
3021
3022         LASSERT(lsmp != NULL);
3023
3024         lsm = *lsmp;
3025         /* Free memmd */
3026         if (lsm != NULL && lmm == NULL) {
3027                 int i;
3028                 for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
3029                         /* For migrating inode, the master stripe and master
3030                          * object will be the same, so do not need iput, see
3031                          * ll_update_lsm_md */
3032                         if (!(lsm->lsm_md_hash_type & LMV_HASH_FLAG_MIGRATION &&
3033                               i == 0) && lsm->lsm_md_oinfo[i].lmo_root != NULL)
3034                                 iput(lsm->lsm_md_oinfo[i].lmo_root);
3035                 }
3036                 lsm_size = lmv_stripe_md_size(lsm->lsm_md_stripe_count);
3037                 OBD_FREE(lsm, lsm_size);
3038                 *lsmp = NULL;
3039                 RETURN(0);
3040         }
3041
3042         /* Alloc memmd */
3043         if (lsm == NULL && lmm == NULL) {
3044                 lsm_size = lmv_stripe_md_size(stripe_count);
3045                 OBD_ALLOC(lsm, lsm_size);
3046                 if (lsm == NULL)
3047                         RETURN(-ENOMEM);
3048                 lsm->lsm_md_stripe_count = stripe_count;
3049                 *lsmp = lsm;
3050                 RETURN(0);
3051         }
3052
3053         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE)
3054                 RETURN(-EPERM);
3055
3056         /* Unpack memmd */
3057         if (le32_to_cpu(lmm->lmv_magic) != LMV_MAGIC_V1 &&
3058             le32_to_cpu(lmm->lmv_magic) != LMV_USER_MAGIC) {
3059                 CERROR("%s: invalid lmv magic %x: rc = %d\n",
3060                        exp->exp_obd->obd_name, le32_to_cpu(lmm->lmv_magic),
3061                        -EIO);
3062                 RETURN(-EIO);
3063         }
3064
3065         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_V1)
3066                 lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
3067         else
3068                 /**
3069                  * Unpack default dirstripe(lmv_user_md) to lmv_stripe_md,
3070                  * stripecount should be 0 then.
3071                  */
3072                 lsm_size = lmv_stripe_md_size(0);
3073
3074         lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
3075         if (lsm == NULL) {
3076                 OBD_ALLOC(lsm, lsm_size);
3077                 if (lsm == NULL)
3078                         RETURN(-ENOMEM);
3079                 allocated = true;
3080                 *lsmp = lsm;
3081         }
3082
3083         switch (le32_to_cpu(lmm->lmv_magic)) {
3084         case LMV_MAGIC_V1:
3085                 rc = lmv_unpack_md_v1(exp, lsm, &lmm->lmv_md_v1);
3086                 break;
3087         default:
3088                 CERROR("%s: unrecognized magic %x\n", exp->exp_obd->obd_name,
3089                        le32_to_cpu(lmm->lmv_magic));
3090                 rc = -EINVAL;
3091                 break;
3092         }
3093
3094         if (rc != 0 && allocated) {
3095                 OBD_FREE(lsm, lsm_size);
3096                 *lsmp = NULL;
3097                 lsm_size = rc;
3098         }
3099         RETURN(lsm_size);
3100 }
3101
3102 int lmv_alloc_memmd(struct lmv_stripe_md **lsmp, int stripes)
3103 {
3104         return lmv_unpack_md(NULL, lsmp, NULL, stripes);
3105 }
3106
3107 void lmv_free_memmd(struct lmv_stripe_md *lsm)
3108 {
3109         lmv_unpack_md(NULL, &lsm, NULL, 0);
3110 }
3111 EXPORT_SYMBOL(lmv_free_memmd);
3112
3113 int lmv_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
3114                  struct lov_mds_md *lmm, int disk_len)
3115 {
3116         return lmv_unpack_md(exp, (struct lmv_stripe_md **)lsmp,
3117                              (union lmv_mds_md *)lmm, disk_len);
3118 }
3119
3120 int lmv_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
3121                struct lov_stripe_md *lsm)
3122 {
3123         struct obd_device               *obd = exp->exp_obd;
3124         struct lmv_obd                  *lmv_obd = &obd->u.lmv;
3125         const struct lmv_stripe_md      *lmv = (struct lmv_stripe_md *)lsm;
3126         int                             stripe_count;
3127
3128         if (lmmp == NULL) {
3129                 if (lsm != NULL)
3130                         stripe_count = lmv->lsm_md_stripe_count;
3131                 else
3132                         stripe_count = lmv_obd->desc.ld_tgt_count;
3133
3134                 return lmv_mds_md_size(stripe_count, LMV_MAGIC_V1);
3135         }
3136
3137         return lmv_pack_md((union lmv_mds_md **)lmmp, lmv, 0);
3138 }
3139
3140 static int lmv_cancel_unused(struct obd_export *exp, const struct lu_fid *fid,
3141                              ldlm_policy_data_t *policy, ldlm_mode_t mode,
3142                              ldlm_cancel_flags_t flags, void *opaque)
3143 {
3144         struct obd_device       *obd = exp->exp_obd;
3145         struct lmv_obd          *lmv = &obd->u.lmv;
3146         int                      rc = 0;
3147         int                      err;
3148         __u32                    i;
3149         ENTRY;
3150
3151         LASSERT(fid != NULL);
3152
3153         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3154                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
3155
3156                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
3157                         continue;
3158
3159                 err = md_cancel_unused(tgt->ltd_exp, fid, policy, mode, flags,
3160                                        opaque);
3161                 if (!rc)
3162                         rc = err;
3163         }
3164         RETURN(rc);
3165 }
3166
3167 int lmv_set_lock_data(struct obd_export *exp, __u64 *lockh, void *data,
3168                       __u64 *bits)
3169 {
3170         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3171         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3172         int                      rc;
3173         ENTRY;
3174
3175         if (tgt == NULL || tgt->ltd_exp == NULL)
3176                 RETURN(-EINVAL);
3177         rc =  md_set_lock_data(tgt->ltd_exp, lockh, data, bits);
3178         RETURN(rc);
3179 }
3180
3181 ldlm_mode_t lmv_lock_match(struct obd_export *exp, __u64 flags,
3182                            const struct lu_fid *fid, ldlm_type_t type,
3183                            ldlm_policy_data_t *policy, ldlm_mode_t mode,
3184                            struct lustre_handle *lockh)
3185 {
3186         struct obd_device       *obd = exp->exp_obd;
3187         struct lmv_obd          *lmv = &obd->u.lmv;
3188         ldlm_mode_t             rc;
3189         int                     tgt;
3190         int                     i;
3191         ENTRY;
3192
3193         CDEBUG(D_INODE, "Lock match for "DFID"\n", PFID(fid));
3194
3195         /*
3196          * With DNE every object can have two locks in different namespaces:
3197          * lookup lock in space of MDT storing direntry and update/open lock in
3198          * space of MDT storing inode.  Try the MDT that the FID maps to first,
3199          * since this can be easily found, and only try others if that fails.
3200          */
3201         for (i = 0, tgt = lmv_find_target_index(lmv, fid);
3202              i < lmv->desc.ld_tgt_count;
3203              i++, tgt = (tgt + 1) % lmv->desc.ld_tgt_count) {
3204                 if (tgt < 0) {
3205                         CDEBUG(D_HA, "%s: "DFID" is inaccessible: rc = %d\n",
3206                                obd->obd_name, PFID(fid), tgt);
3207                         tgt = 0;
3208                 }
3209
3210                 if (lmv->tgts[tgt] == NULL ||
3211                     lmv->tgts[tgt]->ltd_exp == NULL ||
3212                     lmv->tgts[tgt]->ltd_active == 0)
3213                         continue;
3214
3215                 rc = md_lock_match(lmv->tgts[tgt]->ltd_exp, flags, fid,
3216                                    type, policy, mode, lockh);
3217                 if (rc)
3218                         RETURN(rc);
3219         }
3220
3221         RETURN(0);
3222 }
3223
3224 int lmv_get_lustre_md(struct obd_export *exp, struct ptlrpc_request *req,
3225                       struct obd_export *dt_exp, struct obd_export *md_exp,
3226                       struct lustre_md *md)
3227 {
3228         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3229         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3230
3231         if (tgt == NULL || tgt->ltd_exp == NULL)
3232                 RETURN(-EINVAL);
3233
3234         return md_get_lustre_md(lmv->tgts[0]->ltd_exp, req, dt_exp, md_exp, md);
3235 }
3236
3237 int lmv_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
3238 {
3239         struct obd_device       *obd = exp->exp_obd;
3240         struct lmv_obd          *lmv = &obd->u.lmv;
3241         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3242         ENTRY;
3243
3244         if (md->lmv != NULL) {
3245                 lmv_free_memmd(md->lmv);
3246                 md->lmv = NULL;
3247         }
3248         if (tgt == NULL || tgt->ltd_exp == NULL)
3249                 RETURN(-EINVAL);
3250         RETURN(md_free_lustre_md(lmv->tgts[0]->ltd_exp, md));
3251 }
3252
3253 int lmv_set_open_replay_data(struct obd_export *exp,
3254                              struct obd_client_handle *och,
3255                              struct lookup_intent *it)
3256 {
3257         struct obd_device       *obd = exp->exp_obd;
3258         struct lmv_obd          *lmv = &obd->u.lmv;
3259         struct lmv_tgt_desc     *tgt;
3260         ENTRY;
3261
3262         tgt = lmv_find_target(lmv, &och->och_fid);
3263         if (IS_ERR(tgt))
3264                 RETURN(PTR_ERR(tgt));
3265
3266         RETURN(md_set_open_replay_data(tgt->ltd_exp, och, it));
3267 }
3268
3269 int lmv_clear_open_replay_data(struct obd_export *exp,
3270                                struct obd_client_handle *och)
3271 {
3272         struct obd_device       *obd = exp->exp_obd;
3273         struct lmv_obd          *lmv = &obd->u.lmv;
3274         struct lmv_tgt_desc     *tgt;
3275         ENTRY;
3276
3277         tgt = lmv_find_target(lmv, &och->och_fid);
3278         if (IS_ERR(tgt))
3279                 RETURN(PTR_ERR(tgt));
3280
3281         RETURN(md_clear_open_replay_data(tgt->ltd_exp, och));
3282 }
3283
3284 static int lmv_get_remote_perm(struct obd_export *exp,
3285                                const struct lu_fid *fid,
3286                                struct obd_capa *oc, __u32 suppgid,
3287                                struct ptlrpc_request **request)
3288 {
3289         struct obd_device       *obd = exp->exp_obd;
3290         struct lmv_obd          *lmv = &obd->u.lmv;
3291         struct lmv_tgt_desc     *tgt;
3292         int                      rc;
3293         ENTRY;
3294
3295         rc = lmv_check_connect(obd);
3296         if (rc)
3297                 RETURN(rc);
3298
3299         tgt = lmv_find_target(lmv, fid);
3300         if (IS_ERR(tgt))
3301                 RETURN(PTR_ERR(tgt));
3302
3303         rc = md_get_remote_perm(tgt->ltd_exp, fid, oc, suppgid, request);
3304         RETURN(rc);
3305 }
3306
3307 static int lmv_renew_capa(struct obd_export *exp, struct obd_capa *oc,
3308                           renew_capa_cb_t cb)
3309 {
3310         struct obd_device       *obd = exp->exp_obd;
3311         struct lmv_obd          *lmv = &obd->u.lmv;
3312         struct lmv_tgt_desc     *tgt;
3313         int                      rc;
3314         ENTRY;
3315
3316         rc = lmv_check_connect(obd);
3317         if (rc)
3318                 RETURN(rc);
3319
3320         tgt = lmv_find_target(lmv, &oc->c_capa.lc_fid);
3321         if (IS_ERR(tgt))
3322                 RETURN(PTR_ERR(tgt));
3323
3324         rc = md_renew_capa(tgt->ltd_exp, oc, cb);
3325         RETURN(rc);
3326 }
3327
3328 int lmv_unpack_capa(struct obd_export *exp, struct ptlrpc_request *req,
3329                     const struct req_msg_field *field, struct obd_capa **oc)
3330 {
3331         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3332         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3333
3334         if (tgt == NULL || tgt->ltd_exp == NULL)
3335                 RETURN(-EINVAL);
3336         return md_unpack_capa(tgt->ltd_exp, req, field, oc);
3337 }
3338
3339 int lmv_intent_getattr_async(struct obd_export *exp,
3340                              struct md_enqueue_info *minfo,
3341                              struct ldlm_enqueue_info *einfo)
3342 {
3343         struct md_op_data       *op_data = &minfo->mi_data;
3344         struct obd_device       *obd = exp->exp_obd;
3345         struct lmv_obd          *lmv = &obd->u.lmv;
3346         struct lmv_tgt_desc     *tgt = NULL;
3347         int                      rc;
3348         ENTRY;
3349
3350         rc = lmv_check_connect(obd);
3351         if (rc)
3352                 RETURN(rc);
3353
3354         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
3355         if (IS_ERR(tgt))
3356                 RETURN(PTR_ERR(tgt));
3357
3358         rc = md_intent_getattr_async(tgt->ltd_exp, minfo, einfo);
3359         RETURN(rc);
3360 }
3361
3362 int lmv_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
3363                         struct lu_fid *fid, __u64 *bits)
3364 {
3365         struct obd_device       *obd = exp->exp_obd;
3366         struct lmv_obd          *lmv = &obd->u.lmv;
3367         struct lmv_tgt_desc     *tgt;
3368         int                      rc;
3369         ENTRY;
3370
3371         rc = lmv_check_connect(obd);
3372         if (rc)
3373                 RETURN(rc);
3374
3375         tgt = lmv_find_target(lmv, fid);
3376         if (IS_ERR(tgt))
3377                 RETURN(PTR_ERR(tgt));
3378
3379         rc = md_revalidate_lock(tgt->ltd_exp, it, fid, bits);
3380         RETURN(rc);
3381 }
3382
3383 int lmv_get_fid_from_lsm(struct obd_export *exp,
3384                          const struct lmv_stripe_md *lsm,
3385                          const char *name, int namelen, struct lu_fid *fid)
3386 {
3387         const struct lmv_oinfo *oinfo;
3388
3389         LASSERT(lsm != NULL);
3390         oinfo = lsm_name_to_stripe_info(lsm, name, namelen);
3391         if (IS_ERR(oinfo))
3392                 return PTR_ERR(oinfo);
3393
3394         *fid = oinfo->lmo_fid;
3395
3396         RETURN(0);
3397 }
3398
3399 /**
3400  * For lmv, only need to send request to master MDT, and the master MDT will
3401  * process with other slave MDTs. The only exception is Q_GETOQUOTA for which
3402  * we directly fetch data from the slave MDTs.
3403  */
3404 int lmv_quotactl(struct obd_device *unused, struct obd_export *exp,
3405                  struct obd_quotactl *oqctl)
3406 {
3407         struct obd_device   *obd = class_exp2obd(exp);
3408         struct lmv_obd      *lmv = &obd->u.lmv;
3409         struct lmv_tgt_desc *tgt = lmv->tgts[0];
3410         int                  rc = 0;
3411         __u32                i;
3412         __u64                curspace, curinodes;
3413         ENTRY;
3414
3415         if (tgt == NULL ||
3416             tgt->ltd_exp == NULL ||
3417             !tgt->ltd_active ||
3418             lmv->desc.ld_tgt_count == 0) {
3419                 CERROR("master lmv inactive\n");
3420                 RETURN(-EIO);
3421         }
3422
3423         if (oqctl->qc_cmd != Q_GETOQUOTA) {
3424                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
3425                 RETURN(rc);
3426         }
3427
3428         curspace = curinodes = 0;
3429         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3430                 int err;
3431                 tgt = lmv->tgts[i];
3432
3433                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
3434                         continue;
3435
3436                 err = obd_quotactl(tgt->ltd_exp, oqctl);
3437                 if (err) {
3438                         CERROR("getquota on mdt %d failed. %d\n", i, err);
3439                         if (!rc)
3440                                 rc = err;
3441                 } else {
3442                         curspace += oqctl->qc_dqblk.dqb_curspace;
3443                         curinodes += oqctl->qc_dqblk.dqb_curinodes;
3444                 }
3445         }
3446         oqctl->qc_dqblk.dqb_curspace = curspace;
3447         oqctl->qc_dqblk.dqb_curinodes = curinodes;
3448
3449         RETURN(rc);
3450 }
3451
3452 int lmv_quotacheck(struct obd_device *unused, struct obd_export *exp,
3453                    struct obd_quotactl *oqctl)
3454 {
3455         struct obd_device       *obd = class_exp2obd(exp);
3456         struct lmv_obd          *lmv = &obd->u.lmv;
3457         struct lmv_tgt_desc     *tgt;
3458         __u32                    i;
3459         int                      rc = 0;
3460         ENTRY;
3461
3462         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3463                 int err;
3464                 tgt = lmv->tgts[i];
3465                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active) {
3466                         CERROR("lmv idx %d inactive\n", i);
3467                         RETURN(-EIO);
3468                 }
3469
3470                 err = obd_quotacheck(tgt->ltd_exp, oqctl);
3471                 if (err && !rc)
3472                         rc = err;
3473         }
3474
3475         RETURN(rc);
3476 }
3477
3478 static int lmv_merge_attr(struct obd_export *exp,
3479                           const struct lmv_stripe_md *lsm,
3480                           struct cl_attr *attr,
3481                           ldlm_blocking_callback cb_blocking)
3482 {
3483         int rc;
3484         int i;
3485
3486         rc = lmv_revalidate_slaves(exp, lsm, cb_blocking, 0);
3487         if (rc < 0)
3488                 return rc;
3489
3490         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
3491                 struct inode *inode = lsm->lsm_md_oinfo[i].lmo_root;
3492
3493                 CDEBUG(D_INFO, ""DFID" size %llu, blocks %llu nlink %u,"
3494                        " atime %lu ctime %lu, mtime %lu.\n",
3495                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid),
3496                        i_size_read(inode), (unsigned long long)inode->i_blocks,
3497                        inode->i_nlink, LTIME_S(inode->i_atime),
3498                        LTIME_S(inode->i_ctime), LTIME_S(inode->i_mtime));
3499
3500                 /* for slave stripe, it needs to subtract nlink for . and .. */
3501                 if (i != 0)
3502                         attr->cat_nlink += inode->i_nlink - 2;
3503                 else
3504                         attr->cat_nlink = inode->i_nlink;
3505
3506                 attr->cat_size += i_size_read(inode);
3507                 attr->cat_blocks += inode->i_blocks;
3508
3509                 if (attr->cat_atime < LTIME_S(inode->i_atime))
3510                         attr->cat_atime = LTIME_S(inode->i_atime);
3511
3512                 if (attr->cat_ctime < LTIME_S(inode->i_ctime))
3513                         attr->cat_ctime = LTIME_S(inode->i_ctime);
3514
3515                 if (attr->cat_mtime < LTIME_S(inode->i_mtime))
3516                         attr->cat_mtime = LTIME_S(inode->i_mtime);
3517         }
3518         return 0;
3519 }
3520
3521 struct obd_ops lmv_obd_ops = {
3522         .o_owner                = THIS_MODULE,
3523         .o_setup                = lmv_setup,
3524         .o_cleanup              = lmv_cleanup,
3525         .o_precleanup           = lmv_precleanup,
3526         .o_process_config       = lmv_process_config,
3527         .o_connect              = lmv_connect,
3528         .o_disconnect           = lmv_disconnect,
3529         .o_statfs               = lmv_statfs,
3530         .o_get_info             = lmv_get_info,
3531         .o_set_info_async       = lmv_set_info_async,
3532         .o_packmd               = lmv_packmd,
3533         .o_unpackmd             = lmv_unpackmd,
3534         .o_notify               = lmv_notify,
3535         .o_get_uuid             = lmv_get_uuid,
3536         .o_iocontrol            = lmv_iocontrol,
3537         .o_quotacheck           = lmv_quotacheck,
3538         .o_quotactl             = lmv_quotactl
3539 };
3540
3541 struct md_ops lmv_md_ops = {
3542         .m_getstatus            = lmv_getstatus,
3543         .m_null_inode           = lmv_null_inode,
3544         .m_find_cbdata          = lmv_find_cbdata,
3545         .m_close                = lmv_close,
3546         .m_create               = lmv_create,
3547         .m_enqueue              = lmv_enqueue,
3548         .m_getattr              = lmv_getattr,
3549         .m_getxattr             = lmv_getxattr,
3550         .m_getattr_name         = lmv_getattr_name,
3551         .m_intent_lock          = lmv_intent_lock,
3552         .m_link                 = lmv_link,
3553         .m_rename               = lmv_rename,
3554         .m_setattr              = lmv_setattr,
3555         .m_setxattr             = lmv_setxattr,
3556         .m_fsync                = lmv_fsync,
3557         .m_read_page            = lmv_read_page,
3558         .m_unlink               = lmv_unlink,
3559         .m_init_ea_size         = lmv_init_ea_size,
3560         .m_cancel_unused        = lmv_cancel_unused,
3561         .m_set_lock_data        = lmv_set_lock_data,
3562         .m_lock_match           = lmv_lock_match,
3563         .m_get_lustre_md        = lmv_get_lustre_md,
3564         .m_free_lustre_md       = lmv_free_lustre_md,
3565         .m_merge_attr           = lmv_merge_attr,
3566         .m_set_open_replay_data = lmv_set_open_replay_data,
3567         .m_clear_open_replay_data = lmv_clear_open_replay_data,
3568         .m_renew_capa           = lmv_renew_capa,
3569         .m_unpack_capa          = lmv_unpack_capa,
3570         .m_get_remote_perm      = lmv_get_remote_perm,
3571         .m_intent_getattr_async = lmv_intent_getattr_async,
3572         .m_revalidate_lock      = lmv_revalidate_lock,
3573         .m_get_fid_from_lsm     = lmv_get_fid_from_lsm,
3574 };
3575
3576 int __init lmv_init(void)
3577 {
3578         return class_register_type(&lmv_obd_ops, &lmv_md_ops, true, NULL,
3579                                    LUSTRE_LMV_NAME, NULL);
3580 }
3581
3582 static void lmv_exit(void)
3583 {
3584         class_unregister_type(LUSTRE_LMV_NAME);
3585 }
3586
3587 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
3588 MODULE_DESCRIPTION("Lustre Logical Metadata Volume OBD driver");
3589 MODULE_LICENSE("GPL");
3590
3591 module_init(lmv_init);
3592 module_exit(lmv_exit);