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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  */
  31
  32 #define DEBUG_SUBSYSTEM S_LMV
  33
  34 #include <linux/file.h>
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/user_namespace.h>
  38 #include <linux/uidgid.h>
  39 #include <linux/slab.h>
  40 #include <linux/pagemap.h>
  41 #include <linux/mm.h>
  42 #include <linux/math64.h>
  43 #include <linux/seq_file.h>
  44 #include <linux/namei.h>
  45
  46 #include <obd_support.h>
  47 #include <lustre_lib.h>
  48 #include <lustre_net.h>
  49 #include <obd_class.h>
  50 #include <lustre_lmv.h>
  51 #include <lprocfs_status.h>
  52 #include <cl_object.h>
  53 #include <lustre_fid.h>
  54 #include <uapi/linux/lustre/lustre_ioctl.h>
  55 #include <lustre_kernelcomm.h>
  56 #include "lmv_internal.h"
  57
  58 static int lmv_check_connect(struct obd_device *obd);
  59 static inline bool lmv_op_default_rr_mkdir(const struct md_op_data *op_data);
  60
  61 void lmv_activate_target(struct lmv_obd *lmv, struct lmv_tgt_desc *tgt,
  62                          int activate)
  63 {
  64         if (tgt->ltd_active == activate)
  65                 return;
  66
  67         tgt->ltd_active = activate;
  68         lmv->lmv_mdt_descs.ltd_lmv_desc.ld_active_tgt_count +=
  69                 (activate ? 1 : -1);
  70
  71         tgt->ltd_exp->exp_obd->obd_inactive = !activate;
  72 }
  73
  74 /**
  75  * Error codes:
  76  *
  77  *  -EINVAL  : UUID can't be found in the LMV's target list
  78  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
  79  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
  80  */
  81 static int lmv_set_mdc_active(struct lmv_obd *lmv,
  82                               const struct obd_uuid *uuid,
  83                               int activate)
  84 {
  85         struct lu_tgt_desc *tgt = NULL;
  86         struct obd_device *obd;
  87         int rc = 0;
  88
  89         ENTRY;
  90
  91         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
  92                         lmv, uuid->uuid, activate);
  93
  94         spin_lock(&lmv->lmv_lock);
  95         lmv_foreach_connected_tgt(lmv, tgt) {
  96                 CDEBUG(D_INFO, "Target idx %d is %s conn %#llx\n",
  97                        tgt->ltd_index, tgt->ltd_uuid.uuid,
  98                        tgt->ltd_exp->exp_handle.h_cookie);
  99
 100                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 101                         break;
 102         }
 103
 104         if (!tgt)
 105                 GOTO(out_lmv_lock, rc = -EINVAL);
 106
 107         obd = class_exp2obd(tgt->ltd_exp);
 108         if (obd == NULL)
 109                 GOTO(out_lmv_lock, rc = -ENOTCONN);
 110
 111         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
 112                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
 113                obd->obd_type->typ_name, tgt->ltd_index);
 114         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0);
 115
 116         if (tgt->ltd_active == activate) {
 117                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
 118                        activate ? "" : "in");
 119                 GOTO(out_lmv_lock, rc);
 120         }
 121
 122         CDEBUG(D_INFO, "Marking OBD %p %sactive\n", obd,
 123                activate ? "" : "in");
 124         lmv_activate_target(lmv, tgt, activate);
 125         EXIT;
 126
 127  out_lmv_lock:
 128         spin_unlock(&lmv->lmv_lock);
 129         return rc;
 130 }
 131
 132 static struct obd_uuid *lmv_get_uuid(struct obd_export *exp)
 133 {
 134         struct lmv_obd *lmv = &exp->exp_obd->u.lmv;
 135         struct lmv_tgt_desc *tgt = lmv_tgt(lmv, 0);
 136
 137         return tgt ? obd_get_uuid(tgt->ltd_exp) : NULL;
 138 }
 139
 140 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
 141                       enum obd_notify_event ev)
 142 {
 143         struct obd_connect_data *conn_data;
 144         struct lmv_obd          *lmv = &obd->u.lmv;
 145         struct obd_uuid         *uuid;
 146         int                      rc = 0;
 147         ENTRY;
 148
 149         if (strcmp(watched->obd_type->typ_name, LUSTRE_MDC_NAME)) {
 150                 CERROR("unexpected notification of %s %s!\n",
 151                        watched->obd_type->typ_name,
 152                        watched->obd_name);
 153                 RETURN(-EINVAL);
 154         }
 155
 156         uuid = &watched->u.cli.cl_target_uuid;
 157         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE) {
 158                 /*
 159                  * Set MDC as active before notifying the observer, so the
 160                  * observer can use the MDC normally.
 161                  */
 162                 rc = lmv_set_mdc_active(lmv, uuid,
 163                                         ev == OBD_NOTIFY_ACTIVE);
 164                 if (rc) {
 165                         CERROR("%sactivation of %s failed: %d\n",
 166                                ev == OBD_NOTIFY_ACTIVE ? "" : "de",
 167                                uuid->uuid, rc);
 168                         RETURN(rc);
 169                 }
 170         } else if (ev == OBD_NOTIFY_OCD) {
 171                 conn_data = &watched->u.cli.cl_import->imp_connect_data;
 172                 /*
 173                  * XXX: Make sure that ocd_connect_flags from all targets are
 174                  * the same. Otherwise one of MDTs runs wrong version or
 175                  * something like this.  --umka
 176                  */
 177                 obd->obd_self_export->exp_connect_data = *conn_data;
 178         }
 179
 180         /*
 181          * Pass the notification up the chain.
 182          */
 183         if (obd->obd_observer)
 184                 rc = obd_notify(obd->obd_observer, watched, ev);
 185
 186         RETURN(rc);
 187 }
 188
 189 static int lmv_connect(const struct lu_env *env,
 190                        struct obd_export **pexp, struct obd_device *obd,
 191                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 192                        void *localdata)
 193 {
 194         struct lmv_obd *lmv = &obd->u.lmv;
 195         struct lustre_handle conn = { 0 };
 196         struct obd_export *exp;
 197         int rc;
 198         ENTRY;
 199
 200         rc = class_connect(&conn, obd, cluuid);
 201         if (rc) {
 202                 CERROR("class_connection() returned %d\n", rc);
 203                 RETURN(rc);
 204         }
 205
 206         exp = class_conn2export(&conn);
 207
 208         lmv->connected = 0;
 209         lmv->conn_data = *data;
 210         lmv->lmv_cache = localdata;
 211
 212         lmv->lmv_tgts_kobj = kobject_create_and_add("target_obds",
 213                                                     &obd->obd_kset.kobj);
 214         if (!lmv->lmv_tgts_kobj) {
 215                 CERROR("%s: cannot create /sys/fs/lustre/%s/%s/target_obds\n",
 216                        obd->obd_name, obd->obd_type->typ_name, obd->obd_name);
 217         }
 218
 219         rc = lmv_check_connect(obd);
 220         if (rc != 0)
 221                 GOTO(out_sysfs, rc);
 222
 223         *pexp = exp;
 224
 225         RETURN(rc);
 226
 227 out_sysfs:
 228         if (lmv->lmv_tgts_kobj)
 229                 kobject_put(lmv->lmv_tgts_kobj);
 230
 231         class_disconnect(exp);
 232
 233         return rc;
 234 }
 235
 236 static int lmv_init_ea_size(struct obd_export *exp, __u32 easize,
 237                             __u32 def_easize)
 238 {
 239         struct obd_device *obd = exp->exp_obd;
 240         struct lmv_obd *lmv = &obd->u.lmv;
 241         struct lmv_tgt_desc *tgt;
 242         int change = 0;
 243         int rc = 0;
 244
 245         ENTRY;
 246
 247         if (lmv->max_easize < easize) {
 248                 lmv->max_easize = easize;
 249                 change = 1;
 250         }
 251         if (lmv->max_def_easize < def_easize) {
 252                 lmv->max_def_easize = def_easize;
 253                 change = 1;
 254         }
 255
 256         if (change == 0)
 257                 RETURN(0);
 258
 259         if (lmv->connected == 0)
 260                 RETURN(0);
 261
 262         lmv_foreach_connected_tgt(lmv, tgt) {
 263                 if (!tgt->ltd_active)
 264                         continue;
 265
 266                 rc = md_init_ea_size(tgt->ltd_exp, easize, def_easize);
 267                 if (rc) {
 268                         CERROR("%s: obd_init_ea_size() failed on MDT target %d:"
 269                                " rc = %d\n", obd->obd_name, tgt->ltd_index, rc);
 270                         break;
 271                 }
 272         }
 273         RETURN(rc);
 274 }
 275
 276 #define MAX_STRING_SIZE 128
 277
 278 static int lmv_connect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 279 {
 280         struct lmv_obd *lmv = &obd->u.lmv;
 281         struct obd_device *mdc_obd;
 282         struct obd_export *mdc_exp;
 283         struct lu_fld_target target;
 284         int  rc;
 285         ENTRY;
 286
 287         mdc_obd = class_find_client_obd(&tgt->ltd_uuid, LUSTRE_MDC_NAME,
 288                                         &obd->obd_uuid);
 289         if (!mdc_obd) {
 290                 CERROR("target %s not attached\n", tgt->ltd_uuid.uuid);
 291                 RETURN(-EINVAL);
 292         }
 293
 294         CDEBUG(D_CONFIG, "connect to %s(%s) - %s, %s\n",
 295                mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 296                tgt->ltd_uuid.uuid, obd->obd_uuid.uuid);
 297
 298         if (!mdc_obd->obd_set_up) {
 299                 CERROR("target %s is not set up\n", tgt->ltd_uuid.uuid);
 300                 RETURN(-EINVAL);
 301         }
 302
 303         rc = obd_connect(NULL, &mdc_exp, mdc_obd, &obd->obd_uuid,
 304                          &lmv->conn_data, lmv->lmv_cache);
 305         if (rc) {
 306                 CERROR("target %s connect error %d\n", tgt->ltd_uuid.uuid, rc);
 307                 RETURN(rc);
 308         }
 309
 310         /*
 311          * Init fid sequence client for this mdc and add new fld target.
 312          */
 313         rc = obd_fid_init(mdc_obd, mdc_exp, LUSTRE_SEQ_METADATA);
 314         if (rc)
 315                 RETURN(rc);
 316
 317         target.ft_srv = NULL;
 318         target.ft_exp = mdc_exp;
 319         target.ft_idx = tgt->ltd_index;
 320
 321         fld_client_add_target(&lmv->lmv_fld, &target);
 322
 323         rc = obd_register_observer(mdc_obd, obd);
 324         if (rc) {
 325                 obd_disconnect(mdc_exp);
 326                 CERROR("target %s register_observer error %d\n",
 327                        tgt->ltd_uuid.uuid, rc);
 328                 RETURN(rc);
 329         }
 330
 331         if (obd->obd_observer) {
 332                 /*
 333                  * Tell the observer about the new target.
 334                  */
 335                 rc = obd_notify(obd->obd_observer, mdc_exp->exp_obd,
 336                                 OBD_NOTIFY_ACTIVE);
 337                 if (rc) {
 338                         obd_disconnect(mdc_exp);
 339                         RETURN(rc);
 340                 }
 341         }
 342
 343         tgt->ltd_active = 1;
 344         tgt->ltd_exp = mdc_exp;
 345         lmv->lmv_mdt_descs.ltd_lmv_desc.ld_active_tgt_count++;
 346
 347         md_init_ea_size(tgt->ltd_exp, lmv->max_easize, lmv->max_def_easize);
 348
 349         rc = lu_qos_add_tgt(&lmv->lmv_qos, tgt);
 350         if (rc) {
 351                 obd_disconnect(mdc_exp);
 352                 RETURN(rc);
 353         }
 354
 355         CDEBUG(D_CONFIG, "Connected to %s(%s) successfully (%d)\n",
 356                mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 357                atomic_read(&obd->obd_refcount));
 358
 359         lmv_statfs_check_update(obd, tgt);
 360
 361         if (lmv->lmv_tgts_kobj)
 362                 /* Even if we failed to create the link, that's fine */
 363                 rc = sysfs_create_link(lmv->lmv_tgts_kobj,
 364                                        &mdc_obd->obd_kset.kobj,
 365                                        mdc_obd->obd_name);
 366         RETURN(0);
 367 }
 368
 369 static void lmv_del_target(struct lmv_obd *lmv, struct lu_tgt_desc *tgt)
 370 {
 371         LASSERT(tgt);
 372         ltd_del_tgt(&lmv->lmv_mdt_descs, tgt);
 373         OBD_FREE_PTR(tgt);
 374 }
 375
 376 static int lmv_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 377                            __u32 index, int gen)
 378 {
 379         struct obd_device *mdc_obd;
 380         struct lmv_obd *lmv = &obd->u.lmv;
 381         struct lmv_tgt_desc *tgt;
 382         struct lu_tgt_descs *ltd = &lmv->lmv_mdt_descs;
 383         int rc = 0;
 384
 385         ENTRY;
 386
 387         CDEBUG(D_CONFIG, "Target uuid: %s. index %d\n", uuidp->uuid, index);
 388         mdc_obd = class_find_client_obd(uuidp, LUSTRE_MDC_NAME,
 389                                         &obd->obd_uuid);
 390         if (!mdc_obd) {
 391                 CERROR("%s: Target %s not attached: rc = %d\n",
 392                        obd->obd_name, uuidp->uuid, -EINVAL);
 393                 RETURN(-EINVAL);
 394         }
 395
 396         OBD_ALLOC_PTR(tgt);
 397         if (!tgt)
 398                 RETURN(-ENOMEM);
 399
 400         mutex_init(&tgt->ltd_fid_mutex);
 401         tgt->ltd_index = index;
 402         tgt->ltd_uuid = *uuidp;
 403         tgt->ltd_active = 0;
 404
 405         mutex_lock(&ltd->ltd_mutex);
 406         rc = ltd_add_tgt(ltd, tgt);
 407         mutex_unlock(&ltd->ltd_mutex);
 408
 409         if (rc)
 410                 GOTO(out_tgt, rc);
 411
 412         if (!lmv->connected)
 413                 /* lmv_check_connect() will connect this target. */
 414                 RETURN(0);
 415
 416         rc = lmv_connect_mdc(obd, tgt);
 417         if (!rc) {
 418                 int easize = sizeof(struct lmv_stripe_md) +
 419                         lmv->lmv_mdt_count * sizeof(struct lu_fid);
 420
 421                 lmv_init_ea_size(obd->obd_self_export, easize, 0);
 422         }
 423
 424         RETURN(rc);
 425
 426 out_tgt:
 427         OBD_FREE_PTR(tgt);
 428         return rc;
 429 }
 430
 431 static int lmv_check_connect(struct obd_device *obd)
 432 {
 433         struct lmv_obd *lmv = &obd->u.lmv;
 434         struct lmv_tgt_desc *tgt;
 435         int easize;
 436         int rc;
 437
 438         ENTRY;
 439
 440         if (lmv->connected)
 441                 RETURN(0);
 442
 443         mutex_lock(&lmv->lmv_mdt_descs.ltd_mutex);
 444         if (lmv->connected)
 445                 GOTO(unlock, rc = 0);
 446
 447         if (!lmv->lmv_mdt_count) {
 448                 CERROR("%s: no targets configured: rc = -EINVAL\n",
 449                        obd->obd_name);
 450                 GOTO(unlock, rc = -EINVAL);
 451         }
 452
 453         if (!lmv_mdt0_inited(lmv)) {
 454                 CERROR("%s: no target configured for index 0: rc = -EINVAL.\n",
 455                        obd->obd_name);
 456                 GOTO(unlock, rc = -EINVAL);
 457         }
 458
 459         CDEBUG(D_CONFIG, "Time to connect %s to %s\n",
 460                obd->obd_uuid.uuid, obd->obd_name);
 461
 462         lmv_foreach_tgt(lmv, tgt) {
 463                 rc = lmv_connect_mdc(obd, tgt);
 464                 if (rc)
 465                         GOTO(out_disc, rc);
 466         }
 467
 468         lmv->connected = 1;
 469         easize = lmv_mds_md_size(lmv->lmv_mdt_count, LMV_MAGIC);
 470         lmv_init_ea_size(obd->obd_self_export, easize, 0);
 471         EXIT;
 472 unlock:
 473         mutex_unlock(&lmv->lmv_mdt_descs.ltd_mutex);
 474
 475         return rc;
 476
 477 out_disc:
 478         lmv_foreach_tgt(lmv, tgt) {
 479                 tgt->ltd_active = 0;
 480                 if (!tgt->ltd_exp)
 481                         continue;
 482
 483                 --lmv->lmv_mdt_descs.ltd_lmv_desc.ld_active_tgt_count;
 484                 obd_disconnect(tgt->ltd_exp);
 485         }
 486
 487         goto unlock;
 488 }
 489
 490 static int lmv_disconnect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 491 {
 492         struct lmv_obd *lmv = &obd->u.lmv;
 493         struct obd_device *mdc_obd;
 494         int rc;
 495         ENTRY;
 496
 497         LASSERT(tgt != NULL);
 498         LASSERT(obd != NULL);
 499
 500         mdc_obd = class_exp2obd(tgt->ltd_exp);
 501
 502         if (mdc_obd) {
 503                 mdc_obd->obd_force = obd->obd_force;
 504                 mdc_obd->obd_fail = obd->obd_fail;
 505                 mdc_obd->obd_no_recov = obd->obd_no_recov;
 506
 507                 if (lmv->lmv_tgts_kobj)
 508                         sysfs_remove_link(lmv->lmv_tgts_kobj,
 509                                           mdc_obd->obd_name);
 510         }
 511
 512         rc = lu_qos_del_tgt(&lmv->lmv_qos, tgt);
 513         if (rc)
 514                 CERROR("%s: Can't del target from QoS table: rc = %d\n",
 515                        tgt->ltd_exp->exp_obd->obd_name, rc);
 516
 517         rc = fld_client_del_target(&lmv->lmv_fld, tgt->ltd_index);
 518         if (rc)
 519                 CERROR("%s: Can't del fld targets: rc = %d\n",
 520                        tgt->ltd_exp->exp_obd->obd_name, rc);
 521
 522         rc = obd_fid_fini(tgt->ltd_exp->exp_obd);
 523         if (rc)
 524                 CERROR("%s: Can't finalize fids factory: rc = %d\n",
 525                        tgt->ltd_exp->exp_obd->obd_name, rc);
 526
 527         CDEBUG(D_INFO, "Disconnected from %s(%s) successfully\n",
 528                tgt->ltd_exp->exp_obd->obd_name,
 529                tgt->ltd_exp->exp_obd->obd_uuid.uuid);
 530
 531         lmv_activate_target(lmv, tgt, 0);
 532         obd_register_observer(tgt->ltd_exp->exp_obd, NULL);
 533         rc = obd_disconnect(tgt->ltd_exp);
 534         if (rc) {
 535                 CERROR("%s: Target %s disconnect error: rc = %d\n",
 536                        tgt->ltd_exp->exp_obd->obd_name,
 537                        tgt->ltd_uuid.uuid, rc);
 538         }
 539         tgt->ltd_exp = NULL;
 540         RETURN(0);
 541 }
 542
 543 static int lmv_disconnect(struct obd_export *exp)
 544 {
 545         struct obd_device *obd = class_exp2obd(exp);
 546         struct lmv_obd *lmv = &obd->u.lmv;
 547         struct lmv_tgt_desc *tgt;
 548         int rc;
 549
 550         ENTRY;
 551
 552         lmv_foreach_connected_tgt(lmv, tgt)
 553                 lmv_disconnect_mdc(obd, tgt);
 554
 555         if (lmv->lmv_tgts_kobj)
 556                 kobject_put(lmv->lmv_tgts_kobj);
 557
 558         lmv->connected = 0;
 559         rc = class_disconnect(exp);
 560
 561         RETURN(rc);
 562 }
 563
 564 static int lmv_fid2path(struct obd_export *exp, int len, void *karg,
 565                         void __user *uarg)
 566 {
 567         struct obd_device *obd = class_exp2obd(exp);
 568         struct lmv_obd *lmv = &obd->u.lmv;
 569         struct getinfo_fid2path *gf;
 570         struct lmv_tgt_desc *tgt;
 571         struct getinfo_fid2path *remote_gf = NULL;
 572         struct lu_fid root_fid;
 573         int remote_gf_size = 0;
 574         int currentisenc = 0;
 575         int globalisenc = 0;
 576         int rc;
 577
 578         gf = karg;
 579         tgt = lmv_fid2tgt(lmv, &gf->gf_fid);
 580         if (IS_ERR(tgt))
 581                 RETURN(PTR_ERR(tgt));
 582
 583         root_fid = *gf->gf_u.gf_root_fid;
 584         LASSERT(fid_is_sane(&root_fid));
 585
 586 repeat_fid2path:
 587         rc = obd_iocontrol(OBD_IOC_FID2PATH, tgt->ltd_exp, len, gf, uarg);
 588         if (rc != 0 && rc != -EREMOTE)
 589                 GOTO(out_fid2path, rc);
 590
 591         if (gf->gf_u.gf_path[0] == '/') {
 592                 /* by convention, server side (mdt_path_current()) puts
 593                  * a leading '/' to tell client that we are dealing with
 594                  * an encrypted file
 595                  */
 596                 currentisenc = 1;
 597                 globalisenc = 1;
 598         } else {
 599                 currentisenc = 0;
 600         }
 601
 602         /* If remote_gf != NULL, it means just building the
 603          * path on the remote MDT, copy this path segment to gf.
 604          */
 605         if (remote_gf != NULL) {
 606                 struct getinfo_fid2path *ori_gf;
 607                 int oldisenc = 0;
 608                 char *ptr;
 609                 int len;
 610
 611                 ori_gf = (struct getinfo_fid2path *)karg;
 612                 if (strlen(ori_gf->gf_u.gf_path) + 1 +
 613                     strlen(gf->gf_u.gf_path) + 1 > ori_gf->gf_pathlen)
 614                         GOTO(out_fid2path, rc = -EOVERFLOW);
 615
 616                 ptr = ori_gf->gf_u.gf_path;
 617                 oldisenc = ptr[0] == '/';
 618
 619                 len = strlen(gf->gf_u.gf_path);
 620                 if (len) {
 621                         /* move the current path to the right to release space
 622                          * for closer-to-root part
 623                          */
 624                         memmove(ptr + len - currentisenc + 1 + globalisenc,
 625                                 ptr + oldisenc,
 626                                 strlen(ori_gf->gf_u.gf_path) - oldisenc + 1);
 627                         if (globalisenc)
 628                                 *(ptr++) = '/';
 629                         memcpy(ptr, gf->gf_u.gf_path + currentisenc,
 630                                len - currentisenc);
 631                         ptr[len - currentisenc] = '/';
 632                 }
 633         }
 634
 635         CDEBUG(D_INFO, "%s: get path %s "DFID" rec: %llu ln: %u\n",
 636                tgt->ltd_exp->exp_obd->obd_name,
 637                gf->gf_u.gf_path, PFID(&gf->gf_fid), gf->gf_recno,
 638                gf->gf_linkno);
 639
 640         if (rc == 0)
 641                 GOTO(out_fid2path, rc);
 642
 643         /* sigh, has to go to another MDT to do path building further */
 644         if (remote_gf == NULL) {
 645                 remote_gf_size = sizeof(*remote_gf) + len - sizeof(*gf);
 646                 OBD_ALLOC(remote_gf, remote_gf_size);
 647                 if (remote_gf == NULL)
 648                         GOTO(out_fid2path, rc = -ENOMEM);
 649                 remote_gf->gf_pathlen = len - sizeof(*gf);
 650         }
 651
 652         if (!fid_is_sane(&gf->gf_fid)) {
 653                 CERROR("%s: invalid FID "DFID": rc = %d\n",
 654                        tgt->ltd_exp->exp_obd->obd_name,
 655                        PFID(&gf->gf_fid), -EINVAL);
 656                 GOTO(out_fid2path, rc = -EINVAL);
 657         }
 658
 659         tgt = lmv_fid2tgt(lmv, &gf->gf_fid);
 660         if (IS_ERR(tgt))
 661                 GOTO(out_fid2path, rc = -EINVAL);
 662
 663         remote_gf->gf_fid = gf->gf_fid;
 664         remote_gf->gf_recno = -1;
 665         remote_gf->gf_linkno = -1;
 666         memset(remote_gf->gf_u.gf_path, 0, remote_gf->gf_pathlen);
 667         *remote_gf->gf_u.gf_root_fid = root_fid;
 668         gf = remote_gf;
 669         goto repeat_fid2path;
 670
 671 out_fid2path:
 672         if (remote_gf != NULL)
 673                 OBD_FREE(remote_gf, remote_gf_size);
 674         RETURN(rc);
 675 }
 676
 677 static int lmv_hsm_req_count(struct lmv_obd *lmv,
 678                              const struct hsm_user_request *hur,
 679                              const struct lmv_tgt_desc *tgt_mds)
 680 {
 681         struct lmv_tgt_desc *curr_tgt;
 682         __u32 i;
 683         int nr = 0;
 684
 685         /* count how many requests must be sent to the given target */
 686         for (i = 0; i < hur->hur_request.hr_itemcount; i++) {
 687                 curr_tgt = lmv_fid2tgt(lmv, &hur->hur_user_item[i].hui_fid);
 688                 if (IS_ERR(curr_tgt))
 689                         RETURN(PTR_ERR(curr_tgt));
 690                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid))
 691                         nr++;
 692         }
 693         return nr;
 694 }
 695
 696 static int lmv_hsm_req_build(struct lmv_obd *lmv,
 697                               struct hsm_user_request *hur_in,
 698                               const struct lmv_tgt_desc *tgt_mds,
 699                               struct hsm_user_request *hur_out)
 700 {
 701         __u32 i, nr_out;
 702         struct lmv_tgt_desc *curr_tgt;
 703
 704         /* build the hsm_user_request for the given target */
 705         hur_out->hur_request = hur_in->hur_request;
 706         nr_out = 0;
 707         for (i = 0; i < hur_in->hur_request.hr_itemcount; i++) {
 708                 curr_tgt = lmv_fid2tgt(lmv, &hur_in->hur_user_item[i].hui_fid);
 709                 if (IS_ERR(curr_tgt))
 710                         RETURN(PTR_ERR(curr_tgt));
 711                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid)) {
 712                         hur_out->hur_user_item[nr_out] =
 713                                                 hur_in->hur_user_item[i];
 714                         nr_out++;
 715                 }
 716         }
 717         hur_out->hur_request.hr_itemcount = nr_out;
 718         memcpy(hur_data(hur_out), hur_data(hur_in),
 719                hur_in->hur_request.hr_data_len);
 720
 721         RETURN(0);
 722 }
 723
 724 static int lmv_hsm_ct_unregister(struct obd_device *obd, unsigned int cmd,
 725                                  int len, struct lustre_kernelcomm *lk,
 726                                  void __user *uarg)
 727 {
 728         struct lmv_obd *lmv = &obd->u.lmv;
 729         struct lu_tgt_desc *tgt;
 730         int rc;
 731
 732         ENTRY;
 733
 734         /* unregister request (call from llapi_hsm_copytool_fini) */
 735         lmv_foreach_connected_tgt(lmv, tgt)
 736                 /* best effort: try to clean as much as possible
 737                  * (continue on error) */
 738                 obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
 739
 740         /* Whatever the result, remove copytool from kuc groups.
 741          * Unreached coordinators will get EPIPE on next requests
 742          * and will unregister automatically.
 743          */
 744         rc = libcfs_kkuc_group_rem(&obd->obd_uuid, lk->lk_uid, lk->lk_group);
 745
 746         RETURN(rc);
 747 }
 748
 749 static int lmv_hsm_ct_register(struct obd_device *obd, unsigned int cmd,
 750                                int len, struct lustre_kernelcomm *lk,
 751                                void __user *uarg)
 752 {
 753         struct lmv_obd *lmv = &obd->u.lmv;
 754         struct file *filp;
 755         bool any_set = false;
 756         struct kkuc_ct_data *kcd;
 757         size_t kcd_size;
 758         struct lu_tgt_desc *tgt;
 759         __u32 i;
 760         int err;
 761         int rc = 0;
 762
 763         ENTRY;
 764
 765         filp = fget(lk->lk_wfd);
 766         if (!filp)
 767                 RETURN(-EBADF);
 768
 769         if (lk->lk_flags & LK_FLG_DATANR)
 770                 kcd_size = offsetof(struct kkuc_ct_data,
 771                                     kcd_archives[lk->lk_data_count]);
 772         else
 773                 kcd_size = sizeof(*kcd);
 774
 775         OBD_ALLOC(kcd, kcd_size);
 776         if (kcd == NULL)
 777                 GOTO(err_fput, rc = -ENOMEM);
 778
 779         kcd->kcd_nr_archives = lk->lk_data_count;
 780         if (lk->lk_flags & LK_FLG_DATANR) {
 781                 kcd->kcd_magic = KKUC_CT_DATA_ARRAY_MAGIC;
 782                 if (lk->lk_data_count > 0)
 783                         memcpy(kcd->kcd_archives, lk->lk_data,
 784                                sizeof(*kcd->kcd_archives) * lk->lk_data_count);
 785         } else {
 786                 kcd->kcd_magic = KKUC_CT_DATA_BITMAP_MAGIC;
 787         }
 788
 789         rc = libcfs_kkuc_group_add(filp, &obd->obd_uuid, lk->lk_uid,
 790                                    lk->lk_group, kcd, kcd_size);
 791         OBD_FREE(kcd, kcd_size);
 792         if (rc)
 793                 GOTO(err_fput, rc);
 794
 795         /* All or nothing: try to register to all MDS.
 796          * In case of failure, unregister from previous MDS,
 797          * except if it because of inactive target. */
 798         lmv_foreach_connected_tgt(lmv, tgt) {
 799                 err = obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
 800                 if (err) {
 801                         if (tgt->ltd_active) {
 802                                 /* permanent error */
 803                                 CERROR("%s: iocontrol MDC %s on MDT"
 804                                        " idx %d cmd %x: err = %d\n",
 805                                        lmv2obd_dev(lmv)->obd_name,
 806                                        tgt->ltd_uuid.uuid, tgt->ltd_index, cmd,
 807                                        err);
 808                                 rc = err;
 809                                 lk->lk_flags |= LK_FLG_STOP;
 810                                 i = tgt->ltd_index;
 811                                 /* unregister from previous MDS */
 812                                 lmv_foreach_connected_tgt(lmv, tgt) {
 813                                         if (tgt->ltd_index >= i)
 814                                                 break;
 815
 816                                         obd_iocontrol(cmd, tgt->ltd_exp, len,
 817                                                       lk, uarg);
 818                                 }
 819                                 GOTO(err_kkuc_rem, rc);
 820                         }
 821                         /* else: transient error.
 822                          * kuc will register to the missing MDT
 823                          * when it is back */
 824                 } else {
 825                         any_set = true;
 826                 }
 827         }
 828
 829         if (!any_set)
 830                 /* no registration done: return error */
 831                 GOTO(err_kkuc_rem, rc = -ENOTCONN);
 832
 833         RETURN(0);
 834
 835 err_kkuc_rem:
 836         libcfs_kkuc_group_rem(&obd->obd_uuid, lk->lk_uid, lk->lk_group);
 837
 838 err_fput:
 839         fput(filp);
 840         return rc;
 841 }
 842
 843 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
 844                          int len, void *karg, void __user *uarg)
 845 {
 846         struct obd_device *obd = class_exp2obd(exp);
 847         struct lmv_obd *lmv = &obd->u.lmv;
 848         struct lu_tgt_desc *tgt = NULL;
 849         int set = 0;
 850         __u32 count = lmv->lmv_mdt_count;
 851         int rc = 0;
 852
 853         ENTRY;
 854         CDEBUG(D_IOCTL, "%s: cmd=%x len=%u karg=%pK uarg=%pK\n",
 855                exp->exp_obd->obd_name, cmd, len, karg, uarg);
 856         if (count == 0)
 857                 RETURN(-ENOTTY);
 858
 859         /* exit early for unknown ioctl types */
 860         if (unlikely(_IOC_TYPE(cmd) != 'f' && cmd != IOC_OSC_SET_ACTIVE))
 861                 RETURN(OBD_IOC_ERROR(obd->obd_name, cmd, "unknown", -ENOTTY));
 862
 863         /* handle commands that don't use @karg first */
 864         switch (cmd) {
 865         case LL_IOC_GET_CONNECT_FLAGS:
 866                 tgt = lmv_tgt(lmv, 0);
 867                 rc = -ENODATA;
 868                 if (tgt && tgt->ltd_exp)
 869                         rc = obd_iocontrol(cmd, tgt->ltd_exp, len, NULL, uarg);
 870                 RETURN(rc);
 871         }
 872
 873         if (unlikely(karg == NULL))
 874                 RETURN(OBD_IOC_ERROR(obd->obd_name, cmd, "karg=NULL", -EINVAL));
 875
 876         switch (cmd) {
 877         case IOC_OBD_STATFS: {
 878                 struct obd_ioctl_data *data = karg;
 879                 struct obd_device *mdc_obd;
 880                 struct obd_statfs stat_buf = {0};
 881                 __u32 index;
 882
 883                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
 884
 885                 if (index >= lmv->lmv_mdt_descs.ltd_tgts_size)
 886                         RETURN(-ENODEV);
 887
 888                 tgt = lmv_tgt(lmv, index);
 889                 if (!tgt)
 890                         RETURN(-EAGAIN);
 891
 892                 if (!tgt->ltd_active)
 893                         RETURN(-ENODATA);
 894
 895                 mdc_obd = class_exp2obd(tgt->ltd_exp);
 896                 if (!mdc_obd)
 897                         RETURN(-EINVAL);
 898
 899                 /* copy UUID */
 900                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(mdc_obd),
 901                                  min((int) data->ioc_plen2,
 902                                      (int) sizeof(struct obd_uuid))))
 903                         RETURN(-EFAULT);
 904
 905                 rc = obd_statfs(NULL, tgt->ltd_exp, &stat_buf,
 906                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 907                                 0);
 908                 if (rc)
 909                         RETURN(rc);
 910                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
 911                                  min((int) data->ioc_plen1,
 912                                      (int) sizeof(stat_buf))))
 913                         RETURN(-EFAULT);
 914                 break;
 915         }
 916         case OBD_IOC_QUOTACTL: {
 917                 struct if_quotactl *qctl = karg;
 918                 struct obd_quotactl *oqctl;
 919                 struct obd_import *imp;
 920
 921                 if (qctl->qc_valid == QC_MDTIDX) {
 922                         tgt = lmv_tgt(lmv, qctl->qc_idx);
 923                 } else if (qctl->qc_valid == QC_UUID) {
 924                         lmv_foreach_tgt(lmv, tgt) {
 925                                 if (!obd_uuid_equals(&tgt->ltd_uuid,
 926                                                      &qctl->obd_uuid))
 927                                         continue;
 928
 929                                 if (!tgt->ltd_exp)
 930                                         RETURN(-EINVAL);
 931
 932                                 break;
 933                         }
 934                 } else {
 935                         RETURN(-EINVAL);
 936                 }
 937
 938                 if (!tgt)
 939                         RETURN(-ENODEV);
 940
 941                 if (!tgt->ltd_exp)
 942                         RETURN(-EINVAL);
 943
 944                 imp = class_exp2cliimp(tgt->ltd_exp);
 945                 if (!tgt->ltd_active && imp->imp_state != LUSTRE_IMP_IDLE) {
 946                         qctl->qc_valid = QC_MDTIDX;
 947                         qctl->obd_uuid = tgt->ltd_uuid;
 948                         RETURN(-ENODATA);
 949                 }
 950
 951                 OBD_ALLOC_PTR(oqctl);
 952                 if (!oqctl)
 953                         RETURN(-ENOMEM);
 954
 955                 QCTL_COPY(oqctl, qctl);
 956                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
 957                 if (rc == 0) {
 958                         QCTL_COPY(qctl, oqctl);
 959                         qctl->qc_valid = QC_MDTIDX;
 960                         qctl->obd_uuid = tgt->ltd_uuid;
 961                 }
 962                 OBD_FREE_PTR(oqctl);
 963                 break;
 964         }
 965         case LL_IOC_FID2MDTIDX: {
 966                 struct lu_fid *fid = karg;
 967                 int             mdt_index;
 968
 969                 rc = lmv_fld_lookup(lmv, fid, &mdt_index);
 970                 if (rc != 0)
 971                         RETURN(rc);
 972
 973                 /* Note: this is from llite(see ll_dir_ioctl()), @uarg does not
 974                  * point to user space memory for FID2MDTIDX. */
 975                 *(__u32 *)uarg = mdt_index;
 976                 break;
 977         }
 978         case OBD_IOC_FID2PATH: {
 979                 rc = lmv_fid2path(exp, len, karg, uarg);
 980                 break;
 981         }
 982         case LL_IOC_HSM_STATE_GET:
 983         case LL_IOC_HSM_STATE_SET:
 984         case LL_IOC_HSM_ACTION: {
 985                 struct md_op_data *op_data = karg;
 986
 987                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
 988                 if (IS_ERR(tgt))
 989                         RETURN(PTR_ERR(tgt));
 990
 991                 if (tgt->ltd_exp == NULL)
 992                         RETURN(-EINVAL);
 993
 994                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
 995                 break;
 996         }
 997         case LL_IOC_HSM_PROGRESS: {
 998                 const struct hsm_progress_kernel *hpk = karg;
 999
1000                 tgt = lmv_fid2tgt(lmv, &hpk->hpk_fid);
1001                 if (IS_ERR(tgt))
1002                         RETURN(PTR_ERR(tgt));
1003                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1004                 break;
1005         }
1006         case LL_IOC_HSM_REQUEST: {
1007                 struct hsm_user_request *hur = karg;
1008                 unsigned int reqcount = hur->hur_request.hr_itemcount;
1009
1010                 if (reqcount == 0)
1011                         RETURN(0);
1012
1013                 /* if the request is about a single fid
1014                  * or if there is a single MDS, no need to split
1015                  * the request. */
1016                 if (reqcount == 1 || count == 1) {
1017                         tgt = lmv_fid2tgt(lmv, &hur->hur_user_item[0].hui_fid);
1018                         if (IS_ERR(tgt))
1019                                 RETURN(PTR_ERR(tgt));
1020                         rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1021                 } else {
1022                         /* split fid list to their respective MDS */
1023                         lmv_foreach_connected_tgt(lmv, tgt) {
1024                                 int nr, rc1;
1025                                 size_t reqlen;
1026                                 struct hsm_user_request *req;
1027
1028                                 nr = lmv_hsm_req_count(lmv, hur, tgt);
1029                                 if (nr < 0)
1030                                         RETURN(nr);
1031                                 if (nr == 0) /* nothing for this MDS */
1032                                         continue;
1033
1034                                 /* build a request with fids for this MDS */
1035                                 reqlen = offsetof(typeof(*hur),
1036                                                   hur_user_item[nr])
1037                                                 + hur->hur_request.hr_data_len;
1038                                 OBD_ALLOC_LARGE(req, reqlen);
1039                                 if (req == NULL)
1040                                         RETURN(-ENOMEM);
1041                                 rc1 = lmv_hsm_req_build(lmv, hur, tgt, req);
1042                                 if (rc1 < 0)
1043                                         GOTO(hsm_req_err, rc1);
1044                                 rc1 = obd_iocontrol(cmd, tgt->ltd_exp, reqlen,
1045                                                     req, uarg);
1046 hsm_req_err:
1047                                 if (rc1 != 0 && rc == 0)
1048                                         rc = rc1;
1049                                 OBD_FREE_LARGE(req, reqlen);
1050                         }
1051                 }
1052                 break;
1053         }
1054         case LL_IOC_LOV_SWAP_LAYOUTS: {
1055                 struct md_op_data *op_data = karg;
1056                 struct lmv_tgt_desc *tgt1, *tgt2;
1057
1058                 tgt1 = lmv_fid2tgt(lmv, &op_data->op_fid1);
1059                 if (IS_ERR(tgt1))
1060                         RETURN(PTR_ERR(tgt1));
1061
1062                 tgt2 = lmv_fid2tgt(lmv, &op_data->op_fid2);
1063                 if (IS_ERR(tgt2))
1064                         RETURN(PTR_ERR(tgt2));
1065
1066                 if ((tgt1->ltd_exp == NULL) || (tgt2->ltd_exp == NULL))
1067                         RETURN(-EINVAL);
1068
1069                 /* only files on same MDT can have their layouts swapped */
1070                 if (tgt1->ltd_index != tgt2->ltd_index)
1071                         RETURN(-EPERM);
1072
1073                 rc = obd_iocontrol(cmd, tgt1->ltd_exp, len, karg, uarg);
1074                 break;
1075         }
1076         case LL_IOC_HSM_CT_START: {
1077                 struct lustre_kernelcomm *lk = karg;
1078
1079                 if (lk->lk_flags & LK_FLG_STOP)
1080                         rc = lmv_hsm_ct_unregister(obd, cmd, len, lk, uarg);
1081                 else
1082                         rc = lmv_hsm_ct_register(obd, cmd, len, lk, uarg);
1083                 break;
1084         }
1085         default:
1086                 lmv_foreach_connected_tgt(lmv, tgt) {
1087                         struct obd_device *mdc_obd;
1088                         int err;
1089
1090                         /* ll_umount_begin() sets force flag but for lmv, not
1091                          * mdc. Let's pass it through */
1092                         mdc_obd = class_exp2obd(tgt->ltd_exp);
1093                         mdc_obd->obd_force = obd->obd_force;
1094                         err = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1095                         if (err) {
1096                                 if (tgt->ltd_active) {
1097                                         OBD_IOC_ERROR(obd->obd_name, cmd,
1098                                                       tgt->ltd_uuid.uuid, err);
1099                                         if (!rc)
1100                                                 rc = err;
1101                                         if (unlikely(err == -ENOTTY))
1102                                                 break;
1103                                 }
1104                         } else {
1105                                 set = 1;
1106                         }
1107                 }
1108                 if (!set && !rc)
1109                         rc = -EIO;
1110                 break;
1111         }
1112         RETURN(rc);
1113 }
1114
1115 int lmv_fid_alloc(const struct lu_env *env, struct obd_export *exp,
1116                   struct lu_fid *fid, struct md_op_data *op_data)
1117 {
1118         struct obd_device *obd = class_exp2obd(exp);
1119         struct lmv_obd *lmv = &obd->u.lmv;
1120         struct lmv_tgt_desc *tgt;
1121         int rc;
1122
1123         ENTRY;
1124
1125         LASSERT(op_data);
1126         LASSERT(fid);
1127
1128         tgt = lmv_tgt(lmv, op_data->op_mds);
1129         if (!tgt)
1130                 RETURN(-ENODEV);
1131
1132         if (!tgt->ltd_active || !tgt->ltd_exp)
1133                 RETURN(-ENODEV);
1134
1135         /*
1136          * New seq alloc and FLD setup should be atomic. Otherwise we may find
1137          * on server that seq in new allocated fid is not yet known.
1138          */
1139         mutex_lock(&tgt->ltd_fid_mutex);
1140         rc = obd_fid_alloc(NULL, tgt->ltd_exp, fid, NULL);
1141         mutex_unlock(&tgt->ltd_fid_mutex);
1142         if (rc > 0) {
1143                 LASSERT(fid_is_sane(fid));
1144                 rc = 0;
1145         }
1146
1147         RETURN(rc);
1148 }
1149
1150 static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
1151 {
1152         struct lmv_obd *lmv = &obd->u.lmv;
1153         struct lmv_desc *desc;
1154         struct lnet_processid lnet_id;
1155         int i = 0;
1156         int rc;
1157
1158         ENTRY;
1159
1160         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1161                 CERROR("LMV setup requires a descriptor\n");
1162                 RETURN(-EINVAL);
1163         }
1164
1165         desc = (struct lmv_desc *)lustre_cfg_buf(lcfg, 1);
1166         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1167                 CERROR("Lmv descriptor size wrong: %d > %d\n",
1168                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1169                 RETURN(-EINVAL);
1170         }
1171
1172         obd_str2uuid(&lmv->lmv_mdt_descs.ltd_lmv_desc.ld_uuid,
1173                      desc->ld_uuid.uuid);
1174         lmv->lmv_mdt_descs.ltd_lmv_desc.ld_tgt_count = 0;
1175         lmv->lmv_mdt_descs.ltd_lmv_desc.ld_active_tgt_count = 0;
1176         lmv->lmv_mdt_descs.ltd_lmv_desc.ld_qos_maxage =
1177                 LMV_DESC_QOS_MAXAGE_DEFAULT;
1178         lmv->max_def_easize = 0;
1179         lmv->max_easize = 0;
1180
1181         spin_lock_init(&lmv->lmv_lock);
1182
1183         /*
1184          * initialize rr_index to lower 32bit of netid, so that client
1185          * can distribute subdirs evenly from the beginning.
1186          */
1187         while (LNetGetId(i++, &lnet_id) != -ENOENT) {
1188                 if (!nid_is_lo0(&lnet_id.nid)) {
1189                         lmv->lmv_qos_rr_index = ntohl(lnet_id.nid.nid_addr[0]);
1190                         break;
1191                 }
1192         }
1193
1194         rc = lmv_tunables_init(obd);
1195         if (rc)
1196                 CWARN("%s: error adding LMV sysfs/debugfs files: rc = %d\n",
1197                       obd->obd_name, rc);
1198
1199         rc = fld_client_init(&lmv->lmv_fld, obd->obd_name,
1200                              LUSTRE_CLI_FLD_HASH_DHT);
1201         if (rc)
1202                 CERROR("Can't init FLD, err %d\n", rc);
1203
1204         rc = lu_tgt_descs_init(&lmv->lmv_mdt_descs, true);
1205         if (rc)
1206                 CWARN("%s: error initialize target table: rc = %d\n",
1207                       obd->obd_name, rc);
1208
1209         RETURN(rc);
1210 }
1211
1212 static int lmv_cleanup(struct obd_device *obd)
1213 {
1214         struct lmv_obd *lmv = &obd->u.lmv;
1215         struct lu_tgt_desc *tgt;
1216         struct lu_tgt_desc *tmp;
1217
1218         ENTRY;
1219
1220         fld_client_fini(&lmv->lmv_fld);
1221         fld_client_debugfs_fini(&lmv->lmv_fld);
1222
1223         lprocfs_obd_cleanup(obd);
1224         lprocfs_free_md_stats(obd);
1225
1226         lmv_foreach_tgt_safe(lmv, tgt, tmp)
1227                 lmv_del_target(lmv, tgt);
1228         lu_tgt_descs_fini(&lmv->lmv_mdt_descs);
1229
1230         RETURN(0);
1231 }
1232
1233 static int lmv_process_config(struct obd_device *obd, size_t len, void *buf)
1234 {
1235         struct lustre_cfg       *lcfg = buf;
1236         struct obd_uuid         obd_uuid;
1237         int                     gen;
1238         __u32                   index;
1239         int                     rc;
1240         ENTRY;
1241
1242         switch (lcfg->lcfg_command) {
1243         case LCFG_ADD_MDC:
1244                 /* modify_mdc_tgts add 0:lustre-clilmv  1:lustre-MDT0000_UUID
1245                  * 2:0  3:1  4:lustre-MDT0000-mdc_UUID */
1246                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
1247                         GOTO(out, rc = -EINVAL);
1248
1249                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
1250
1251                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%u", &index) != 1)
1252                         GOTO(out, rc = -EINVAL);
1253                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", &gen) != 1)
1254                         GOTO(out, rc = -EINVAL);
1255                 rc = lmv_add_target(obd, &obd_uuid, index, gen);
1256                 GOTO(out, rc);
1257         default:
1258                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1259                 GOTO(out, rc = -EINVAL);
1260         }
1261 out:
1262         RETURN(rc);
1263 }
1264
1265 static int lmv_select_statfs_mdt(struct lmv_obd *lmv, __u32 flags)
1266 {
1267         int i;
1268
1269         if (flags & OBD_STATFS_FOR_MDT0)
1270                 return 0;
1271
1272         if (lmv->lmv_statfs_start || lmv->lmv_mdt_count == 1)
1273                 return lmv->lmv_statfs_start;
1274
1275         /* choose initial MDT for this client */
1276         for (i = 0;; i++) {
1277                 struct lnet_processid lnet_id;
1278                 if (LNetGetId(i, &lnet_id) == -ENOENT)
1279                         break;
1280
1281                 if (!nid_is_lo0(&lnet_id.nid)) {
1282                         /* We dont need a full 64-bit modulus, just enough
1283                          * to distribute the requests across MDTs evenly.
1284                          */
1285                         lmv->lmv_statfs_start = nidhash(&lnet_id.nid) %
1286                                                 lmv->lmv_mdt_count;
1287                         break;
1288                 }
1289         }
1290
1291         return lmv->lmv_statfs_start;
1292 }
1293
1294 static int lmv_statfs(const struct lu_env *env, struct obd_export *exp,
1295                       struct obd_statfs *osfs, time64_t max_age, __u32 flags)
1296 {
1297         struct obd_device *obd = class_exp2obd(exp);
1298         struct lmv_obd *lmv = &obd->u.lmv;
1299         struct obd_statfs *temp;
1300         struct lu_tgt_desc *tgt;
1301         __u32 i;
1302         __u32 idx;
1303         int rc = 0;
1304         int err = 0;
1305
1306         ENTRY;
1307
1308         OBD_ALLOC(temp, sizeof(*temp));
1309         if (temp == NULL)
1310                 RETURN(-ENOMEM);
1311
1312         /* distribute statfs among MDTs */
1313         idx = lmv_select_statfs_mdt(lmv, flags);
1314
1315         for (i = 0; i < lmv->lmv_mdt_descs.ltd_tgts_size; i++, idx++) {
1316                 idx = idx % lmv->lmv_mdt_descs.ltd_tgts_size;
1317                 tgt = lmv_tgt(lmv, idx);
1318                 if (!tgt || !tgt->ltd_exp)
1319                         continue;
1320
1321                 rc = obd_statfs(env, tgt->ltd_exp, temp, max_age,
1322                                 flags | OBD_STATFS_NESTED);
1323                 if (rc) {
1324                         CERROR("%s: can't stat MDS #%d: rc = %d\n",
1325                                tgt->ltd_exp->exp_obd->obd_name, i, rc);
1326                         err = rc;
1327                         /* Try another MDT */
1328                         if (flags & OBD_STATFS_SUM)
1329                                 continue;
1330                         GOTO(out_free_temp, rc);
1331                 }
1332
1333                 if (temp->os_state & OS_STATFS_SUM ||
1334                     flags == OBD_STATFS_FOR_MDT0) {
1335                         /* reset to the last aggregated values
1336                          * and don't sum with non-aggrated data */
1337                         /* If the statfs is from mount, it needs to retrieve
1338                          * necessary information from MDT0. i.e. mount does
1339                          * not need the merged osfs from all of MDT. Also
1340                          * clients can be mounted as long as MDT0 is in
1341                          * service */
1342                         *osfs = *temp;
1343                         GOTO(out_free_temp, rc);
1344                 }
1345
1346                 if (i == 0) {
1347                         *osfs = *temp;
1348                 } else {
1349                         osfs->os_bavail += temp->os_bavail;
1350                         osfs->os_blocks += temp->os_blocks;
1351                         osfs->os_ffree += temp->os_ffree;
1352                         osfs->os_files += temp->os_files;
1353                         osfs->os_granted += temp->os_granted;
1354                 }
1355         }
1356         /* There is no stats from some MDTs, data incomplete */
1357         if (err)
1358                 rc = err;
1359 out_free_temp:
1360         OBD_FREE(temp, sizeof(*temp));
1361         RETURN(rc);
1362 }
1363
1364 static int lmv_statfs_update(void *cookie, int rc)
1365 {
1366         struct obd_info *oinfo = cookie;
1367         struct obd_device *obd = oinfo->oi_obd;
1368         struct lmv_obd *lmv = &obd->u.lmv;
1369         struct lmv_tgt_desc *tgt = oinfo->oi_tgt;
1370         struct obd_statfs *osfs = oinfo->oi_osfs;
1371
1372         /*
1373          * NB: don't deactivate TGT upon error, because we may not trigger async
1374          * statfs any longer, then there is no chance to activate TGT.
1375          */
1376         if (!rc) {
1377                 spin_lock(&lmv->lmv_lock);
1378                 tgt->ltd_statfs = *osfs;
1379                 tgt->ltd_statfs_age = ktime_get_seconds();
1380                 spin_unlock(&lmv->lmv_lock);
1381                 set_bit(LQ_DIRTY, &lmv->lmv_qos.lq_flags);
1382         }
1383
1384         return rc;
1385 }
1386
1387 /* update tgt statfs async if it's ld_qos_maxage old */
1388 int lmv_statfs_check_update(struct obd_device *obd, struct lmv_tgt_desc *tgt)
1389 {
1390         struct obd_info oinfo = {
1391                 .oi_obd = obd,
1392                 .oi_tgt = tgt,
1393                 .oi_cb_up = lmv_statfs_update,
1394         };
1395         int rc;
1396
1397         if (ktime_get_seconds() - tgt->ltd_statfs_age <
1398             obd->u.lmv.lmv_mdt_descs.ltd_lmv_desc.ld_qos_maxage)
1399                 return 0;
1400
1401         rc = obd_statfs_async(tgt->ltd_exp, &oinfo, 0, NULL);
1402
1403         return rc;
1404 }
1405
1406 static int lmv_get_root(struct obd_export *exp, const char *fileset,
1407                         struct lu_fid *fid)
1408 {
1409         struct obd_device *obd = exp->exp_obd;
1410         struct lmv_obd *lmv = &obd->u.lmv;
1411         struct lu_tgt_desc *tgt = lmv_tgt(lmv, 0);
1412         int rc;
1413
1414         ENTRY;
1415
1416         if (!tgt)
1417                 RETURN(-ENODEV);
1418
1419         rc = md_get_root(tgt->ltd_exp, fileset, fid);
1420         RETURN(rc);
1421 }
1422
1423 static int lmv_getxattr(struct obd_export *exp, const struct lu_fid *fid,
1424                         u64 obd_md_valid, const char *name, size_t buf_size,
1425                         struct ptlrpc_request **req)
1426 {
1427         struct obd_device *obd = exp->exp_obd;
1428         struct lmv_obd *lmv = &obd->u.lmv;
1429         struct lmv_tgt_desc *tgt;
1430         int rc;
1431
1432         ENTRY;
1433
1434         tgt = lmv_fid2tgt(lmv, fid);
1435         if (IS_ERR(tgt))
1436                 RETURN(PTR_ERR(tgt));
1437
1438         rc = md_getxattr(tgt->ltd_exp, fid, obd_md_valid, name, buf_size, req);
1439
1440         RETURN(rc);
1441 }
1442
1443 static int lmv_setxattr(struct obd_export *exp, const struct lu_fid *fid,
1444                         u64 obd_md_valid, const char *name,
1445                         const void *value, size_t value_size,
1446                         unsigned int xattr_flags, u32 suppgid,
1447                         struct ptlrpc_request **req)
1448 {
1449         struct obd_device *obd = exp->exp_obd;
1450         struct lmv_obd *lmv = &obd->u.lmv;
1451         struct lmv_tgt_desc *tgt;
1452         int rc;
1453
1454         ENTRY;
1455
1456         tgt = lmv_fid2tgt(lmv, fid);
1457         if (IS_ERR(tgt))
1458                 RETURN(PTR_ERR(tgt));
1459
1460         rc = md_setxattr(tgt->ltd_exp, fid, obd_md_valid, name,
1461                          value, value_size, xattr_flags, suppgid, req);
1462
1463         RETURN(rc);
1464 }
1465
1466 static int lmv_getattr(struct obd_export *exp, struct md_op_data *op_data,
1467                        struct ptlrpc_request **request)
1468 {
1469         struct obd_device *obd = exp->exp_obd;
1470         struct lmv_obd *lmv = &obd->u.lmv;
1471         struct lmv_tgt_desc *tgt;
1472         int rc;
1473
1474         ENTRY;
1475
1476         tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
1477         if (IS_ERR(tgt))
1478                 RETURN(PTR_ERR(tgt));
1479
1480         if (op_data->op_flags & MF_GET_MDT_IDX) {
1481                 op_data->op_mds = tgt->ltd_index;
1482                 RETURN(0);
1483         }
1484
1485         rc = md_getattr(tgt->ltd_exp, op_data, request);
1486
1487         RETURN(rc);
1488 }
1489
1490 static int lmv_null_inode(struct obd_export *exp, const struct lu_fid *fid)
1491 {
1492         struct obd_device *obd = exp->exp_obd;
1493         struct lmv_obd *lmv = &obd->u.lmv;
1494         struct lu_tgt_desc *tgt;
1495
1496         ENTRY;
1497
1498         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1499
1500         /*
1501          * With DNE every object can have two locks in different namespaces:
1502          * lookup lock in space of MDT storing direntry and update/open lock in
1503          * space of MDT storing inode.
1504          */
1505         lmv_foreach_connected_tgt(lmv, tgt)
1506                 md_null_inode(tgt->ltd_exp, fid);
1507
1508         RETURN(0);
1509 }
1510
1511 static int lmv_close(struct obd_export *exp, struct md_op_data *op_data,
1512                      struct md_open_data *mod, struct ptlrpc_request **request)
1513 {
1514         struct obd_device *obd = exp->exp_obd;
1515         struct lmv_obd *lmv = &obd->u.lmv;
1516         struct lmv_tgt_desc *tgt;
1517         int rc;
1518
1519         ENTRY;
1520
1521         tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
1522         if (IS_ERR(tgt))
1523                 RETURN(PTR_ERR(tgt));
1524
1525         CDEBUG(D_INODE, "CLOSE "DFID"\n", PFID(&op_data->op_fid1));
1526         rc = md_close(tgt->ltd_exp, op_data, mod, request);
1527         RETURN(rc);
1528 }
1529
1530 static struct lu_tgt_desc *lmv_locate_tgt_qos(struct lmv_obd *lmv,
1531                                               struct md_op_data *op_data)
1532 {
1533         struct lu_tgt_desc *tgt, *cur = NULL;
1534         __u64 total_avail = 0;
1535         __u64 total_weight = 0;
1536         __u64 cur_weight = 0;
1537         int total_usable = 0;
1538         __u64 rand;
1539         int rc;
1540
1541         ENTRY;
1542
1543         if (!ltd_qos_is_usable(&lmv->lmv_mdt_descs))
1544                 RETURN(ERR_PTR(-EAGAIN));
1545
1546         down_write(&lmv->lmv_qos.lq_rw_sem);
1547
1548         if (!ltd_qos_is_usable(&lmv->lmv_mdt_descs))
1549                 GOTO(unlock, tgt = ERR_PTR(-EAGAIN));
1550
1551         rc = ltd_qos_penalties_calc(&lmv->lmv_mdt_descs);
1552         if (rc)
1553                 GOTO(unlock, tgt = ERR_PTR(rc));
1554
1555         lmv_foreach_tgt(lmv, tgt) {
1556                 if (!tgt->ltd_exp || !tgt->ltd_active) {
1557                         tgt->ltd_qos.ltq_usable = 0;
1558                         continue;
1559                 }
1560
1561                 tgt->ltd_qos.ltq_usable = 1;
1562                 lu_tgt_qos_weight_calc(tgt, true);
1563                 if (tgt->ltd_index == op_data->op_mds)
1564                         cur = tgt;
1565                 total_avail += tgt->ltd_qos.ltq_avail;
1566                 total_weight += tgt->ltd_qos.ltq_weight;
1567                 total_usable++;
1568         }
1569
1570         /* If current MDT has above-average space and dir is not aleady using
1571          * round-robin to spread across more MDTs, stay on the parent MDT
1572          * to avoid creating needless remote MDT directories.  Remote dirs
1573          * close to the root balance space more effectively than bottom dirs,
1574          * so prefer to create remote dirs at top level of directory tree.
1575          * "16 / (dir_depth + 10)" is the factor to make it less likely
1576          * for top-level directories to stay local unless they have more than
1577          * average free space, while deep dirs prefer local until more full.
1578          *    depth=0 -> 160%, depth=3 -> 123%, depth=6 -> 100%,
1579          *    depth=9 -> 84%, depth=12 -> 73%, depth=15 -> 64%
1580          */
1581         if (!lmv_op_default_rr_mkdir(op_data)) {
1582                 rand = total_avail * 16 /
1583                         (total_usable * (op_data->op_dir_depth + 10));
1584                 if (cur && cur->ltd_qos.ltq_avail >= rand) {
1585                         tgt = cur;
1586                         GOTO(unlock, tgt);
1587                 }
1588         }
1589
1590         rand = lu_prandom_u64_max(total_weight);
1591
1592         lmv_foreach_connected_tgt(lmv, tgt) {
1593                 if (!tgt->ltd_qos.ltq_usable)
1594                         continue;
1595
1596                 cur_weight += tgt->ltd_qos.ltq_weight;
1597                 if (cur_weight < rand)
1598                         continue;
1599
1600                 ltd_qos_update(&lmv->lmv_mdt_descs, tgt, &total_weight);
1601                 GOTO(unlock, tgt);
1602         }
1603
1604         /* no proper target found */
1605         GOTO(unlock, tgt = ERR_PTR(-EAGAIN));
1606 unlock:
1607         up_write(&lmv->lmv_qos.lq_rw_sem);
1608
1609         return tgt;
1610 }
1611
1612 static struct lu_tgt_desc *lmv_locate_tgt_rr(struct lmv_obd *lmv)
1613 {
1614         struct lu_tgt_desc *tgt;
1615         int i;
1616         int index;
1617
1618         ENTRY;
1619
1620         spin_lock(&lmv->lmv_lock);
1621         for (i = 0; i < lmv->lmv_mdt_descs.ltd_tgts_size; i++) {
1622                 index = (i + lmv->lmv_qos_rr_index) %
1623                         lmv->lmv_mdt_descs.ltd_tgts_size;
1624                 tgt = lmv_tgt(lmv, index);
1625                 if (!tgt || !tgt->ltd_exp || !tgt->ltd_active)
1626                         continue;
1627
1628                 lmv->lmv_qos_rr_index = (tgt->ltd_index + 1) %
1629                                         lmv->lmv_mdt_descs.ltd_tgts_size;
1630                 spin_unlock(&lmv->lmv_lock);
1631
1632                 RETURN(tgt);
1633         }
1634         spin_unlock(&lmv->lmv_lock);
1635
1636         RETURN(ERR_PTR(-ENODEV));
1637 }
1638
1639 /* locate MDT which is less full (avoid the most full MDT) */
1640 static struct lu_tgt_desc *lmv_locate_tgt_lf(struct lmv_obd *lmv)
1641 {
1642         struct lu_tgt_desc *min = NULL;
1643         struct lu_tgt_desc *tgt;
1644         __u64 avail = 0;
1645         __u64 rand;
1646
1647         ENTRY;
1648
1649         if (!ltd_qos_is_usable(&lmv->lmv_mdt_descs))
1650                 RETURN(ERR_PTR(-EAGAIN));
1651
1652         down_write(&lmv->lmv_qos.lq_rw_sem);
1653
1654         if (!ltd_qos_is_usable(&lmv->lmv_mdt_descs))
1655                 GOTO(unlock, tgt = ERR_PTR(-EAGAIN));
1656
1657         lmv_foreach_tgt(lmv, tgt) {
1658                 if (!tgt->ltd_exp || !tgt->ltd_active) {
1659                         tgt->ltd_qos.ltq_usable = 0;
1660                         continue;
1661                 }
1662
1663                 tgt->ltd_qos.ltq_usable = 1;
1664                 lu_tgt_qos_weight_calc(tgt, true);
1665                 avail += tgt->ltd_qos.ltq_avail;
1666                 if (!min || min->ltd_qos.ltq_avail > tgt->ltd_qos.ltq_avail)
1667                         min = tgt;
1668         }
1669
1670         /* avoid the most full MDT */
1671         if (min)
1672                 avail -= min->ltd_qos.ltq_avail;
1673
1674         rand = lu_prandom_u64_max(avail);
1675         avail = 0;
1676         lmv_foreach_connected_tgt(lmv, tgt) {
1677                 if (!tgt->ltd_qos.ltq_usable)
1678                         continue;
1679
1680                 if (tgt == min)
1681                         continue;
1682
1683                 avail += tgt->ltd_qos.ltq_avail;
1684                 if (avail < rand)
1685                         continue;
1686
1687                 GOTO(unlock, tgt);
1688         }
1689
1690         /* no proper target found */
1691         GOTO(unlock, tgt = ERR_PTR(-EAGAIN));
1692 unlock:
1693         up_write(&lmv->lmv_qos.lq_rw_sem);
1694
1695         RETURN(tgt);
1696 }
1697
1698 /* locate MDT by file name, for striped directory, the file name hash decides
1699  * which stripe its dirent is stored.
1700  */
1701 static struct lmv_tgt_desc *
1702 lmv_locate_tgt_by_name(struct lmv_obd *lmv, struct lmv_stripe_md *lsm,
1703                        const char *name, int namelen, struct lu_fid *fid,
1704                        __u32 *mds, bool new_layout)
1705 {
1706         struct lmv_tgt_desc *tgt;
1707         const struct lmv_oinfo *oinfo;
1708
1709         if (!lmv_dir_striped(lsm) || !namelen) {
1710                 tgt = lmv_fid2tgt(lmv, fid);
1711                 if (IS_ERR(tgt))
1712                         return tgt;
1713
1714                 *mds = tgt->ltd_index;
1715                 return tgt;
1716         }
1717
1718         if (CFS_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_NAME_HASH)) {
1719                 if (cfs_fail_val >= lsm->lsm_md_stripe_count)
1720                         return ERR_PTR(-EBADF);
1721                 oinfo = &lsm->lsm_md_oinfo[cfs_fail_val];
1722         } else {
1723                 oinfo = lsm_name_to_stripe_info(lsm, name, namelen, new_layout);
1724                 if (IS_ERR(oinfo))
1725                         return ERR_CAST(oinfo);
1726         }
1727
1728         /* check stripe FID is sane */
1729         if (!fid_is_sane(&oinfo->lmo_fid))
1730                 return ERR_PTR(-ENODEV);
1731
1732         *fid = oinfo->lmo_fid;
1733         *mds = oinfo->lmo_mds;
1734         tgt = lmv_tgt(lmv, oinfo->lmo_mds);
1735
1736         CDEBUG(D_INODE, "locate MDT %u parent "DFID"\n", *mds, PFID(fid));
1737
1738         return tgt ? tgt : ERR_PTR(-ENODEV);
1739 }
1740
1741 /**
1742  * Locate MDT of op_data->op_fid1
1743  *
1744  * For striped directory, it will locate the stripe by name hash, if hash_type
1745  * is unknown, it will return the stripe specified by 'op_data->op_stripe_index'
1746  * which is set outside, and if dir is migrating, 'op_data->op_new_layout'
1747  * indicates whether old or new layout is used to locate.
1748  *
1749  * For plain direcotry, it just locate the MDT of op_data->op_fid1.
1750  *
1751  * \param[in] lmv               LMV device
1752  * \param[in/out] op_data       client MD stack parameters, name, namelen etc,
1753  *                              op_mds and op_fid1 will be updated if op_mea1
1754  *                              indicates fid1 represents a striped directory.
1755  *
1756  * retval               pointer to the lmv_tgt_desc if succeed.
1757  *                      ERR_PTR(errno) if failed.
1758  */
1759 struct lmv_tgt_desc *
1760 lmv_locate_tgt(struct lmv_obd *lmv, struct md_op_data *op_data)
1761 {
1762         struct lmv_stripe_md *lsm = op_data->op_mea1;
1763         struct lmv_oinfo *oinfo;
1764         struct lmv_tgt_desc *tgt;
1765
1766         if (lmv_dir_foreign(lsm))
1767                 return ERR_PTR(-ENODATA);
1768
1769         /* During creating VOLATILE file, it should honor the mdt
1770          * index if the file under striped dir is being restored, see
1771          * ct_restore(). */
1772         if (op_data->op_bias & MDS_CREATE_VOLATILE &&
1773             op_data->op_mds != LMV_OFFSET_DEFAULT) {
1774                 tgt = lmv_tgt(lmv, op_data->op_mds);
1775                 if (!tgt)
1776                         return ERR_PTR(-ENODEV);
1777
1778                 if (lmv_dir_striped(lsm)) {
1779                         int i;
1780
1781                         /* refill the right parent fid */
1782                         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
1783                                 oinfo = &lsm->lsm_md_oinfo[i];
1784                                 if (oinfo->lmo_mds == op_data->op_mds) {
1785                                         op_data->op_fid1 = oinfo->lmo_fid;
1786                                         break;
1787                                 }
1788                         }
1789
1790                         if (i == lsm->lsm_md_stripe_count)
1791                                 op_data->op_fid1 = lsm->lsm_md_oinfo[0].lmo_fid;
1792                 }
1793         } else if (lmv_dir_bad_hash(lsm)) {
1794                 LASSERT(op_data->op_stripe_index < lsm->lsm_md_stripe_count);
1795                 oinfo = &lsm->lsm_md_oinfo[op_data->op_stripe_index];
1796
1797                 op_data->op_fid1 = oinfo->lmo_fid;
1798                 op_data->op_mds = oinfo->lmo_mds;
1799                 tgt = lmv_tgt(lmv, oinfo->lmo_mds);
1800                 if (!tgt)
1801                         return ERR_PTR(-ENODEV);
1802         } else {
1803                 tgt = lmv_locate_tgt_by_name(lmv, op_data->op_mea1,
1804                                 op_data->op_name, op_data->op_namelen,
1805                                 &op_data->op_fid1, &op_data->op_mds,
1806                                 op_data->op_new_layout);
1807         }
1808
1809         return tgt;
1810 }
1811
1812 /* Locate MDT of op_data->op_fid2 for link/rename */
1813 static struct lmv_tgt_desc *
1814 lmv_locate_tgt2(struct lmv_obd *lmv, struct md_op_data *op_data)
1815 {
1816         struct lmv_tgt_desc *tgt;
1817         int rc;
1818
1819         LASSERT(op_data->op_name);
1820         if (lmv_dir_layout_changing(op_data->op_mea2)) {
1821                 struct lu_fid fid1 = op_data->op_fid1;
1822                 struct lmv_stripe_md *lsm1 = op_data->op_mea1;
1823                 struct ptlrpc_request *request = NULL;
1824
1825                 /*
1826                  * avoid creating new file under old layout of migrating
1827                  * directory, check it here.
1828                  */
1829                 tgt = lmv_locate_tgt_by_name(lmv, op_data->op_mea2,
1830                                 op_data->op_name, op_data->op_namelen,
1831                                 &op_data->op_fid2, &op_data->op_mds, false);
1832                 if (IS_ERR(tgt))
1833                         RETURN(tgt);
1834
1835                 op_data->op_fid1 = op_data->op_fid2;
1836                 op_data->op_mea1 = op_data->op_mea2;
1837                 rc = md_getattr_name(tgt->ltd_exp, op_data, &request);
1838                 op_data->op_fid1 = fid1;
1839                 op_data->op_mea1 = lsm1;
1840                 if (!rc) {
1841                         ptlrpc_req_finished(request);
1842                         RETURN(ERR_PTR(-EEXIST));
1843                 }
1844
1845                 if (rc != -ENOENT)
1846                         RETURN(ERR_PTR(rc));
1847         }
1848
1849         return lmv_locate_tgt_by_name(lmv, op_data->op_mea2, op_data->op_name,
1850                                 op_data->op_namelen, &op_data->op_fid2,
1851                                 &op_data->op_mds, true);
1852 }
1853
1854 int lmv_old_layout_lookup(struct lmv_obd *lmv, struct md_op_data *op_data)
1855 {
1856         struct lu_tgt_desc *tgt;
1857         struct ptlrpc_request *request;
1858         int rc;
1859
1860         LASSERT(lmv_dir_layout_changing(op_data->op_mea1));
1861         LASSERT(!op_data->op_new_layout);
1862
1863         tgt = lmv_locate_tgt(lmv, op_data);
1864         if (IS_ERR(tgt))
1865                 return PTR_ERR(tgt);
1866
1867         rc = md_getattr_name(tgt->ltd_exp, op_data, &request);
1868         if (!rc) {
1869                 ptlrpc_req_finished(request);
1870                 return -EEXIST;
1871         }
1872
1873         return rc;
1874 }
1875
1876 /* mkdir by QoS upon 'lfs mkdir -i -1'.
1877  *
1878  * NB, mkdir by QoS only if parent is not striped, this is to avoid remote
1879  * directories under striped directory.
1880  */
1881 static inline bool lmv_op_user_qos_mkdir(const struct md_op_data *op_data)
1882 {
1883         const struct lmv_user_md *lum = op_data->op_data;
1884
1885         if (op_data->op_code != LUSTRE_OPC_MKDIR)
1886                 return false;
1887
1888         if (lmv_dir_striped(op_data->op_mea1))
1889                 return false;
1890
1891         return (op_data->op_cli_flags & CLI_SET_MEA) && lum &&
1892                le32_to_cpu(lum->lum_magic) == LMV_USER_MAGIC &&
1893                le32_to_cpu(lum->lum_stripe_offset) == LMV_OFFSET_DEFAULT;
1894 }
1895
1896 /* mkdir by QoS if either ROOT or parent default LMV is space balanced. */
1897 static inline bool lmv_op_default_qos_mkdir(const struct md_op_data *op_data)
1898 {
1899         const struct lmv_stripe_md *lsm = op_data->op_default_mea1;
1900
1901         if (op_data->op_code != LUSTRE_OPC_MKDIR)
1902                 return false;
1903
1904         if (lmv_dir_striped(op_data->op_mea1))
1905                 return false;
1906
1907         return (op_data->op_flags & MF_QOS_MKDIR) ||
1908                (lsm && lsm->lsm_md_master_mdt_index == LMV_OFFSET_DEFAULT);
1909 }
1910
1911 /* if parent default LMV is space balanced, and
1912  * 1. max_inherit_rr is set
1913  * 2. or parent is ROOT
1914  * mkdir roundrobin. Or if parent doesn't have default LMV, while ROOT default
1915  * LMV requests roundrobin mkdir, do the same.
1916  * NB, this needs to check server is balanced, which is done by caller.
1917  */
1918 static inline bool lmv_op_default_rr_mkdir(const struct md_op_data *op_data)
1919 {
1920         const struct lmv_stripe_md *lsm = op_data->op_default_mea1;
1921
1922         return (op_data->op_flags & MF_RR_MKDIR) ||
1923                (lsm && lsm->lsm_md_max_inherit_rr != LMV_INHERIT_RR_NONE) ||
1924                fid_is_root(&op_data->op_fid1);
1925 }
1926
1927 /* 'lfs mkdir -i <specific_MDT>' */
1928 static inline bool lmv_op_user_specific_mkdir(const struct md_op_data *op_data)
1929 {
1930         const struct lmv_user_md *lum = op_data->op_data;
1931
1932         return op_data->op_code == LUSTRE_OPC_MKDIR &&
1933                op_data->op_cli_flags & CLI_SET_MEA && lum &&
1934                (le32_to_cpu(lum->lum_magic) == LMV_USER_MAGIC ||
1935                 le32_to_cpu(lum->lum_magic) == LMV_USER_MAGIC_SPECIFIC) &&
1936                le32_to_cpu(lum->lum_stripe_offset) != LMV_OFFSET_DEFAULT;
1937 }
1938
1939 /* parent default LMV master_mdt_index is not -1. */
1940 static inline bool
1941 lmv_op_default_specific_mkdir(const struct md_op_data *op_data)
1942 {
1943         return op_data->op_code == LUSTRE_OPC_MKDIR &&
1944                op_data->op_default_mea1 &&
1945                op_data->op_default_mea1->lsm_md_master_mdt_index !=
1946                         LMV_OFFSET_DEFAULT;
1947 }
1948
1949 /* locate MDT by space usage */
1950 static struct lu_tgt_desc *lmv_locate_tgt_by_space(struct lmv_obd *lmv,
1951                                                    struct md_op_data *op_data,
1952                                                    struct lmv_tgt_desc *tgt)
1953 {
1954         struct lmv_tgt_desc *tmp = tgt;
1955
1956         tgt = lmv_locate_tgt_qos(lmv, op_data);
1957         if (tgt == ERR_PTR(-EAGAIN)) {
1958                 if (ltd_qos_is_balanced(&lmv->lmv_mdt_descs) &&
1959                     !lmv_op_default_rr_mkdir(op_data) &&
1960                     !lmv_op_user_qos_mkdir(op_data))
1961                         /* if not necessary, don't create remote directory. */
1962                         tgt = tmp;
1963                 else
1964                         tgt = lmv_locate_tgt_rr(lmv);
1965         }
1966
1967         /*
1968          * only update statfs after QoS mkdir, this means the cached statfs may
1969          * be stale, and current mkdir may not follow QoS accurately, but it's
1970          * not serious, and avoids periodic statfs when client doesn't mkdir by
1971          * QoS.
1972          */
1973         if (!IS_ERR(tgt)) {
1974                 op_data->op_mds = tgt->ltd_index;
1975                 lmv_statfs_check_update(lmv2obd_dev(lmv), tgt);
1976         }
1977
1978         return tgt;
1979 }
1980
1981 int lmv_create(struct obd_export *exp, struct md_op_data *op_data,
1982                 const void *data, size_t datalen, umode_t mode, uid_t uid,
1983                 gid_t gid, kernel_cap_t cap_effective, __u64 rdev,
1984                 struct ptlrpc_request **request)
1985 {
1986         struct obd_device *obd = exp->exp_obd;
1987         struct lmv_obd *lmv = &obd->u.lmv;
1988         struct lmv_tgt_desc *tgt;
1989         struct mdt_body *repbody;
1990         int rc;
1991
1992         ENTRY;
1993
1994         if (!lmv->lmv_mdt_descs.ltd_lmv_desc.ld_active_tgt_count)
1995                 RETURN(-EIO);
1996
1997         if (lmv_dir_bad_hash(op_data->op_mea1))
1998                 RETURN(-EBADF);
1999
2000         if (lmv_dir_layout_changing(op_data->op_mea1)) {
2001                 /*
2002                  * if parent is migrating, create() needs to lookup existing
2003                  * name in both old and new layout, check old layout on client.
2004                  */
2005                 rc = lmv_old_layout_lookup(lmv, op_data);
2006                 if (rc != -ENOENT)
2007                         RETURN(rc);
2008
2009                 op_data->op_new_layout = true;
2010         }
2011
2012         tgt = lmv_locate_tgt(lmv, op_data);
2013         if (IS_ERR(tgt))
2014                 RETURN(PTR_ERR(tgt));
2015
2016         /* the order to apply policy in mkdir:
2017          * 1. is "lfs mkdir -i N"? mkdir on MDT N.
2018          * 2. is "lfs mkdir -i -1"? mkdir by space usage.
2019          * 3. is starting MDT specified in default LMV? mkdir on MDT N.
2020          * 4. is default LMV space balanced? mkdir by space usage.
2021          */
2022         if (lmv_op_user_specific_mkdir(op_data)) {
2023                 struct lmv_user_md *lum = op_data->op_data;
2024
2025                 op_data->op_mds = le32_to_cpu(lum->lum_stripe_offset);
2026                 tgt = lmv_tgt(lmv, op_data->op_mds);
2027                 if (!tgt)
2028                         RETURN(-ENODEV);
2029         } else if (lmv_op_user_qos_mkdir(op_data)) {
2030                 tgt = lmv_locate_tgt_by_space(lmv, op_data, tgt);
2031                 if (IS_ERR(tgt))
2032                         RETURN(PTR_ERR(tgt));
2033         } else if (lmv_op_default_specific_mkdir(op_data)) {
2034                 op_data->op_mds =
2035                         op_data->op_default_mea1->lsm_md_master_mdt_index;
2036                 tgt = lmv_tgt(lmv, op_data->op_mds);
2037                 if (!tgt)
2038                         RETURN(-ENODEV);
2039         } else if (lmv_op_default_qos_mkdir(op_data)) {
2040                 tgt = lmv_locate_tgt_by_space(lmv, op_data, tgt);
2041                 if (IS_ERR(tgt))
2042                         RETURN(PTR_ERR(tgt));
2043         }
2044
2045 retry:
2046         rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
2047         if (rc)
2048                 RETURN(rc);
2049
2050         CDEBUG(D_INODE, "CREATE name '%.*s' "DFID" on "DFID" -> mds #%x\n",
2051                 (int)op_data->op_namelen, op_data->op_name,
2052                 PFID(&op_data->op_fid2), PFID(&op_data->op_fid1),
2053                 op_data->op_mds);
2054
2055         op_data->op_flags |= MF_MDC_CANCEL_FID1;
2056         rc = md_create(tgt->ltd_exp, op_data, data, datalen, mode, uid, gid,
2057                        cap_effective, rdev, request);
2058         if (rc == 0) {
2059                 if (*request == NULL)
2060                         RETURN(rc);
2061                 CDEBUG(D_INODE, "Created - "DFID"\n", PFID(&op_data->op_fid2));
2062         }
2063
2064         /* dir restripe needs to send to MDT where dir is located */
2065         if (rc != -EREMOTE ||
2066             !(exp_connect_flags2(exp) & OBD_CONNECT2_CRUSH))
2067                 RETURN(rc);
2068
2069         repbody = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
2070         if (repbody == NULL)
2071                 RETURN(-EPROTO);
2072
2073         /* Not cross-ref case, just get out of here. */
2074         if (likely(!(repbody->mbo_valid & OBD_MD_MDS)))
2075                 RETURN(rc);
2076
2077         op_data->op_fid2 = repbody->mbo_fid1;
2078         ptlrpc_req_finished(*request);
2079         *request = NULL;
2080
2081         tgt = lmv_fid2tgt(lmv, &op_data->op_fid2);
2082         if (IS_ERR(tgt))
2083                 RETURN(PTR_ERR(tgt));
2084
2085         op_data->op_mds = tgt->ltd_index;
2086         goto retry;
2087 }
2088
2089 static int
2090 lmv_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
2091             const union ldlm_policy_data *policy, struct md_op_data *op_data,
2092             struct lustre_handle *lockh, __u64 extra_lock_flags)
2093 {
2094         struct obd_device *obd = exp->exp_obd;
2095         struct lmv_obd *lmv = &obd->u.lmv;
2096         struct lmv_tgt_desc *tgt;
2097         int rc;
2098
2099         ENTRY;
2100
2101         CDEBUG(D_INODE, "ENQUEUE on "DFID"\n", PFID(&op_data->op_fid1));
2102
2103         tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
2104         if (IS_ERR(tgt))
2105                 RETURN(PTR_ERR(tgt));
2106
2107         CDEBUG(D_INODE, "ENQUEUE on "DFID" -> mds #%u\n",
2108                PFID(&op_data->op_fid1), tgt->ltd_index);
2109
2110         rc = md_enqueue(tgt->ltd_exp, einfo, policy, op_data, lockh,
2111                         extra_lock_flags);
2112
2113         RETURN(rc);
2114 }
2115
2116 int
2117 lmv_getattr_name(struct obd_export *exp,struct md_op_data *op_data,
2118                  struct ptlrpc_request **preq)
2119 {
2120         struct obd_device *obd = exp->exp_obd;
2121         struct lmv_obd *lmv = &obd->u.lmv;
2122         struct lmv_tgt_desc *tgt;
2123         struct mdt_body *body;
2124         int rc;
2125
2126         ENTRY;
2127
2128 retry:
2129         if (op_data->op_namelen == 2 &&
2130             op_data->op_name[0] == '.' && op_data->op_name[1] == '.')
2131                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
2132         else
2133                 tgt = lmv_locate_tgt(lmv, op_data);
2134         if (IS_ERR(tgt))
2135                 RETURN(PTR_ERR(tgt));
2136
2137         CDEBUG(D_INODE, "GETATTR_NAME for %*s on "DFID" -> mds #%d\n",
2138                 (int)op_data->op_namelen, op_data->op_name,
2139                 PFID(&op_data->op_fid1), tgt->ltd_index);
2140
2141         rc = md_getattr_name(tgt->ltd_exp, op_data, preq);
2142         if (rc == -ENOENT && lmv_dir_retry_check_update(op_data)) {
2143                 ptlrpc_req_finished(*preq);
2144                 *preq = NULL;
2145                 goto retry;
2146         }
2147
2148         if (rc)
2149                 RETURN(rc);
2150
2151         body = req_capsule_server_get(&(*preq)->rq_pill, &RMF_MDT_BODY);
2152         LASSERT(body != NULL);
2153
2154         if (body->mbo_valid & OBD_MD_MDS) {
2155                 op_data->op_fid1 = body->mbo_fid1;
2156                 op_data->op_valid |= OBD_MD_FLCROSSREF;
2157                 op_data->op_namelen = 0;
2158                 op_data->op_name = NULL;
2159
2160                 ptlrpc_req_finished(*preq);
2161                 *preq = NULL;
2162
2163                 goto retry;
2164         }
2165
2166         RETURN(rc);
2167 }
2168
2169 #define md_op_data_fid(op_data, fl)                     \
2170         (fl == MF_MDC_CANCEL_FID1 ? &op_data->op_fid1 : \
2171          fl == MF_MDC_CANCEL_FID2 ? &op_data->op_fid2 : \
2172          fl == MF_MDC_CANCEL_FID3 ? &op_data->op_fid3 : \
2173          fl == MF_MDC_CANCEL_FID4 ? &op_data->op_fid4 : \
2174          NULL)
2175
2176 static int lmv_early_cancel(struct obd_export *exp, struct lmv_tgt_desc *tgt,
2177                             struct md_op_data *op_data, __u32 op_tgt,
2178                             enum ldlm_mode mode, int bits, int flag)
2179 {
2180         struct lu_fid *fid = md_op_data_fid(op_data, flag);
2181         struct lmv_obd *lmv = &exp->exp_obd->u.lmv;
2182         union ldlm_policy_data policy = { { 0 } };
2183         int rc = 0;
2184         ENTRY;
2185
2186         if (!fid_is_sane(fid))
2187                 RETURN(0);
2188
2189         if (tgt == NULL) {
2190                 tgt = lmv_fid2tgt(lmv, fid);
2191                 if (IS_ERR(tgt))
2192                         RETURN(PTR_ERR(tgt));
2193         }
2194
2195         if (tgt->ltd_index != op_tgt) {
2196                 CDEBUG(D_INODE, "EARLY_CANCEL on "DFID"\n", PFID(fid));
2197                 policy.l_inodebits.bits = bits;
2198                 rc = md_cancel_unused(tgt->ltd_exp, fid, &policy,
2199                                       mode, LCF_ASYNC, NULL);
2200         } else {
2201                 CDEBUG(D_INODE,
2202                        "EARLY_CANCEL skip operation target %d on "DFID"\n",
2203                        op_tgt, PFID(fid));
2204                 op_data->op_flags |= flag;
2205                 rc = 0;
2206         }
2207
2208         RETURN(rc);
2209 }
2210
2211 /*
2212  * llite passes fid of an target inode in op_data->op_fid1 and id of directory in
2213  * op_data->op_fid2
2214  */
2215 static int lmv_link(struct obd_export *exp, struct md_op_data *op_data,
2216                     struct ptlrpc_request **request)
2217 {
2218         struct obd_device       *obd = exp->exp_obd;
2219         struct lmv_obd          *lmv = &obd->u.lmv;
2220         struct lmv_tgt_desc     *tgt;
2221         int                      rc;
2222         ENTRY;
2223
2224         LASSERT(op_data->op_namelen != 0);
2225
2226         CDEBUG(D_INODE, "LINK "DFID":%*s to "DFID"\n",
2227                PFID(&op_data->op_fid2), (int)op_data->op_namelen,
2228                op_data->op_name, PFID(&op_data->op_fid1));
2229
2230         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2231         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2232         op_data->op_cap = current_cap();
2233
2234         tgt = lmv_locate_tgt2(lmv, op_data);
2235         if (IS_ERR(tgt))
2236                 RETURN(PTR_ERR(tgt));
2237
2238         /*
2239          * Cancel UPDATE lock on child (fid1).
2240          */
2241         op_data->op_flags |= MF_MDC_CANCEL_FID2;
2242         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_index, LCK_EX,
2243                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2244         if (rc != 0)
2245                 RETURN(rc);
2246
2247         rc = md_link(tgt->ltd_exp, op_data, request);
2248
2249         RETURN(rc);
2250 }
2251
2252 /* migrate the top directory */
2253 static inline bool lmv_op_topdir_migrate(const struct md_op_data *op_data)
2254 {
2255         if (!S_ISDIR(op_data->op_mode))
2256                 return false;
2257
2258         if (lmv_dir_layout_changing(op_data->op_mea1))
2259                 return false;
2260
2261         return true;
2262 }
2263
2264 /* migrate top dir to specific MDTs */
2265 static inline bool lmv_topdir_specific_migrate(const struct md_op_data *op_data)
2266 {
2267         const struct lmv_user_md *lum = op_data->op_data;
2268
2269         if (!lmv_op_topdir_migrate(op_data))
2270                 return false;
2271
2272         return le32_to_cpu(lum->lum_stripe_offset) != LMV_OFFSET_DEFAULT;
2273 }
2274
2275 /* migrate top dir in QoS mode if user issued "lfs migrate -m -1..." */
2276 static inline bool lmv_topdir_qos_migrate(const struct md_op_data *op_data)
2277 {
2278         const struct lmv_user_md *lum = op_data->op_data;
2279
2280         if (!lmv_op_topdir_migrate(op_data))
2281                 return false;
2282
2283         return le32_to_cpu(lum->lum_stripe_offset) == LMV_OFFSET_DEFAULT;
2284 }
2285
2286 static inline bool lmv_subdir_specific_migrate(const struct md_op_data *op_data)
2287 {
2288         const struct lmv_user_md *lum = op_data->op_data;
2289
2290         if (!S_ISDIR(op_data->op_mode))
2291                 return false;
2292
2293         if (!lmv_dir_layout_changing(op_data->op_mea1))
2294                 return false;
2295
2296         return le32_to_cpu(lum->lum_stripe_offset) != LMV_OFFSET_DEFAULT;
2297 }
2298
2299 static int lmv_migrate(struct obd_export *exp, struct md_op_data *op_data,
2300                         const char *name, size_t namelen,
2301                         struct ptlrpc_request **request)
2302 {
2303         struct obd_device *obd = exp->exp_obd;
2304         struct lmv_obd *lmv = &obd->u.lmv;
2305         struct lmv_stripe_md *lsm = op_data->op_mea1;
2306         struct lmv_tgt_desc *parent_tgt;
2307         struct lmv_tgt_desc *sp_tgt;
2308         struct lmv_tgt_desc *tp_tgt = NULL;
2309         struct lmv_tgt_desc *child_tgt;
2310         struct lmv_tgt_desc *tgt;
2311         struct lu_fid target_fid = { 0 };
2312         int rc;
2313
2314         ENTRY;
2315
2316         LASSERT(op_data->op_cli_flags & CLI_MIGRATE);
2317
2318         CDEBUG(D_INODE, "MIGRATE "DFID"/%.*s\n",
2319                PFID(&op_data->op_fid1), (int)namelen, name);
2320
2321         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2322         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2323         op_data->op_cap = current_cap();
2324
2325         parent_tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
2326         if (IS_ERR(parent_tgt))
2327                 RETURN(PTR_ERR(parent_tgt));
2328
2329         if (lmv_dir_striped(lsm)) {
2330                 const struct lmv_oinfo *oinfo;
2331
2332                 oinfo = lsm_name_to_stripe_info(lsm, name, namelen, false);
2333                 if (IS_ERR(oinfo))
2334                         RETURN(PTR_ERR(oinfo));
2335
2336                 /* save source stripe FID in fid4 temporarily for ELC */
2337                 op_data->op_fid4 = oinfo->lmo_fid;
2338                 sp_tgt = lmv_tgt(lmv, oinfo->lmo_mds);
2339                 if (!sp_tgt)
2340                         RETURN(-ENODEV);
2341
2342                 /*
2343                  * if parent is being migrated too, fill op_fid2 with target
2344                  * stripe fid, otherwise the target stripe is not created yet.
2345                  */
2346                 if (lmv_dir_layout_changing(lsm)) {
2347                         oinfo = lsm_name_to_stripe_info(lsm, name, namelen,
2348                                                         true);
2349                         if (IS_ERR(oinfo))
2350                                 RETURN(PTR_ERR(oinfo));
2351
2352                         op_data->op_fid2 = oinfo->lmo_fid;
2353                         tp_tgt = lmv_tgt(lmv, oinfo->lmo_mds);
2354                         if (!tp_tgt)
2355                                 RETURN(-ENODEV);
2356
2357                         /* parent unchanged and update namespace only */
2358                         if (lu_fid_eq(&op_data->op_fid4, &op_data->op_fid2) &&
2359                             op_data->op_bias & MDS_MIGRATE_NSONLY)
2360                                 RETURN(-EALREADY);
2361                 }
2362         } else {
2363                 sp_tgt = parent_tgt;
2364         }
2365
2366         child_tgt = lmv_fid2tgt(lmv, &op_data->op_fid3);
2367         if (IS_ERR(child_tgt))
2368                 RETURN(PTR_ERR(child_tgt));
2369
2370         if (lmv_topdir_specific_migrate(op_data)) {
2371                 struct lmv_user_md *lum = op_data->op_data;
2372
2373                 op_data->op_mds = le32_to_cpu(lum->lum_stripe_offset);
2374         } else if (lmv_topdir_qos_migrate(op_data)) {
2375                 tgt = lmv_locate_tgt_lf(lmv);
2376                 if (tgt == ERR_PTR(-EAGAIN))
2377                         tgt = lmv_locate_tgt_rr(lmv);
2378                 if (IS_ERR(tgt))
2379                         RETURN(PTR_ERR(tgt));
2380
2381                 op_data->op_mds = tgt->ltd_index;
2382         } else if (lmv_subdir_specific_migrate(op_data)) {
2383                 struct lmv_user_md *lum = op_data->op_data;
2384                 __u32 i;
2385
2386                 LASSERT(tp_tgt);
2387                 if (le32_to_cpu(lum->lum_magic) == LMV_USER_MAGIC_SPECIFIC) {
2388                         /* adjust MDTs in lum, since subdir is located on where
2389                          * its parent stripe is, not the first specified MDT.
2390                          */
2391                         for (i = 0; i < le32_to_cpu(lum->lum_stripe_count);
2392                              i++) {
2393                                 if (le32_to_cpu(lum->lum_objects[i].lum_mds) ==
2394                                     tp_tgt->ltd_index)
2395                                         break;
2396                         }
2397
2398                         if (i == le32_to_cpu(lum->lum_stripe_count))
2399                                 RETURN(-ENODEV);
2400
2401                         lum->lum_objects[i].lum_mds =
2402                                 lum->lum_objects[0].lum_mds;
2403                         lum->lum_objects[0].lum_mds =
2404                                 cpu_to_le32(tp_tgt->ltd_index);
2405                 }
2406                 /* NB, the above adjusts subdir migration for command like
2407                  * "lfs migrate -m 0,1,2 ...", but for migration like
2408                  * "lfs migrate -m 0 -c 2 ...", the top dir is migrated to MDT0
2409                  * and MDT1, however its subdir may be migrated to MDT1 and MDT2
2410                  */
2411
2412                 lum->lum_stripe_offset = cpu_to_le32(tp_tgt->ltd_index);
2413                 op_data->op_mds = tp_tgt->ltd_index;
2414         } else if (tp_tgt) {
2415                 op_data->op_mds = tp_tgt->ltd_index;
2416         } else {
2417                 op_data->op_mds = sp_tgt->ltd_index;
2418         }
2419
2420         rc = lmv_fid_alloc(NULL, exp, &target_fid, op_data);
2421         if (rc)
2422                 RETURN(rc);
2423
2424         /*
2425          * for directory, send migrate request to the MDT where the object will
2426          * be migrated to, because we can't create a striped directory remotely.
2427          *
2428          * otherwise, send to the MDT where source is located because regular
2429          * file may open lease.
2430          *
2431          * NB. if MDT doesn't support DIR_MIGRATE, send to source MDT too for
2432          * backward compatibility.
2433          */
2434         if (S_ISDIR(op_data->op_mode) &&
2435             (exp_connect_flags2(exp) & OBD_CONNECT2_DIR_MIGRATE)) {
2436                 tgt = lmv_fid2tgt(lmv, &target_fid);
2437                 if (IS_ERR(tgt))
2438                         RETURN(PTR_ERR(tgt));
2439         } else {
2440                 tgt = child_tgt;
2441         }
2442
2443         /* cancel UPDATE lock of parent master object */
2444         rc = lmv_early_cancel(exp, parent_tgt, op_data, tgt->ltd_index, LCK_EX,
2445                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2446         if (rc)
2447                 RETURN(rc);
2448
2449         /* cancel UPDATE lock of source parent */
2450         if (sp_tgt != parent_tgt) {
2451                 /*
2452                  * migrate RPC packs master object FID, because we can only pack
2453                  * two FIDs in reint RPC, but MDS needs to know both source
2454                  * parent and target parent, and it will obtain them from master
2455                  * FID and LMV, the other FID in RPC is kept for target.
2456                  *
2457                  * since this FID is not passed to MDC, cancel it anyway.
2458                  */
2459                 rc = lmv_early_cancel(exp, sp_tgt, op_data, -1, LCK_EX,
2460                                       MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID4);
2461                 if (rc)
2462                         RETURN(rc);
2463
2464                 op_data->op_flags &= ~MF_MDC_CANCEL_FID4;
2465         }
2466         op_data->op_fid4 = target_fid;
2467
2468         /* cancel UPDATE locks of target parent */
2469         rc = lmv_early_cancel(exp, tp_tgt, op_data, tgt->ltd_index, LCK_EX,
2470                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID2);
2471         if (rc)
2472                 RETURN(rc);
2473
2474         /* cancel LOOKUP lock of source if source is remote object */
2475         if (child_tgt != sp_tgt) {
2476                 rc = lmv_early_cancel(exp, sp_tgt, op_data, tgt->ltd_index,
2477                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2478                                       MF_MDC_CANCEL_FID3);
2479                 if (rc)
2480                         RETURN(rc);
2481         }
2482
2483         /* cancel ELC locks of source */
2484         rc = lmv_early_cancel(exp, child_tgt, op_data, tgt->ltd_index, LCK_EX,
2485                               MDS_INODELOCK_ELC, MF_MDC_CANCEL_FID3);
2486         if (rc)
2487                 RETURN(rc);
2488
2489         rc = md_rename(tgt->ltd_exp, op_data, name, namelen, NULL, 0, request);
2490
2491         RETURN(rc);
2492 }
2493
2494 static int lmv_rename(struct obd_export *exp, struct md_op_data *op_data,
2495                       const char *old, size_t oldlen,
2496                       const char *new, size_t newlen,
2497                       struct ptlrpc_request **request)
2498 {
2499         struct obd_device *obd = exp->exp_obd;
2500         struct lmv_obd *lmv = &obd->u.lmv;
2501         struct lmv_tgt_desc *sp_tgt;
2502         struct lmv_tgt_desc *tp_tgt = NULL;
2503         struct lmv_tgt_desc *src_tgt = NULL;
2504         struct lmv_tgt_desc *tgt;
2505         struct mdt_body *body;
2506         int rc;
2507
2508         ENTRY;
2509
2510         LASSERT(oldlen != 0);
2511
2512         if (op_data->op_cli_flags & CLI_MIGRATE) {
2513                 rc = lmv_migrate(exp, op_data, old, oldlen, request);
2514                 RETURN(rc);
2515         }
2516
2517         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2518         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2519         op_data->op_cap = current_cap();
2520
2521         op_data->op_name = new;
2522         op_data->op_namelen = newlen;
2523
2524         tp_tgt = lmv_locate_tgt2(lmv, op_data);
2525         if (IS_ERR(tp_tgt))
2526                 RETURN(PTR_ERR(tp_tgt));
2527
2528         /* Since the target child might be destroyed, and it might become
2529          * orphan, and we can only check orphan on the local MDT right now, so
2530          * we send rename request to the MDT where target child is located. If
2531          * target child does not exist, then it will send the request to the
2532          * target parent */
2533         if (fid_is_sane(&op_data->op_fid4)) {
2534                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid4);
2535                 if (IS_ERR(tgt))
2536                         RETURN(PTR_ERR(tgt));
2537         } else {
2538                 tgt = tp_tgt;
2539         }
2540
2541         op_data->op_flags |= MF_MDC_CANCEL_FID4;
2542
2543         /* cancel UPDATE locks of target parent */
2544         rc = lmv_early_cancel(exp, tp_tgt, op_data, tgt->ltd_index, LCK_EX,
2545                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID2);
2546         if (rc != 0)
2547                 RETURN(rc);
2548
2549         if (fid_is_sane(&op_data->op_fid4)) {
2550                 /* cancel LOOKUP lock of target on target parent */
2551                 if (tgt != tp_tgt) {
2552                         rc = lmv_early_cancel(exp, tp_tgt, op_data,
2553                                               tgt->ltd_index, LCK_EX,
2554                                               MDS_INODELOCK_LOOKUP,
2555                                               MF_MDC_CANCEL_FID4);
2556                         if (rc != 0)
2557                                 RETURN(rc);
2558                 }
2559         }
2560
2561         if (fid_is_sane(&op_data->op_fid3)) {
2562                 src_tgt = lmv_fid2tgt(lmv, &op_data->op_fid3);
2563                 if (IS_ERR(src_tgt))
2564                         RETURN(PTR_ERR(src_tgt));
2565
2566                 /* cancel ELC locks of source */
2567                 rc = lmv_early_cancel(exp, src_tgt, op_data, tgt->ltd_index,
2568                                       LCK_EX, MDS_INODELOCK_ELC,
2569                                       MF_MDC_CANCEL_FID3);
2570                 if (rc != 0)
2571                         RETURN(rc);
2572         }
2573
2574         op_data->op_name = old;
2575         op_data->op_namelen = oldlen;
2576 retry:
2577         sp_tgt = lmv_locate_tgt(lmv, op_data);
2578         if (IS_ERR(sp_tgt))
2579                 RETURN(PTR_ERR(sp_tgt));
2580
2581         /* cancel UPDATE locks of source parent */
2582         rc = lmv_early_cancel(exp, sp_tgt, op_data, tgt->ltd_index, LCK_EX,
2583                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2584         if (rc != 0)
2585                 RETURN(rc);
2586
2587         if (fid_is_sane(&op_data->op_fid3)) {
2588                 /* cancel LOOKUP lock of source on source parent */
2589                 if (src_tgt != sp_tgt) {
2590                         rc = lmv_early_cancel(exp, sp_tgt, op_data,
2591                                               tgt->ltd_index, LCK_EX,
2592                                               MDS_INODELOCK_LOOKUP,
2593                                               MF_MDC_CANCEL_FID3);
2594                         if (rc != 0)
2595                                 RETURN(rc);
2596                 }
2597         }
2598
2599 rename:
2600         CDEBUG(D_INODE, "RENAME "DFID"/%.*s to "DFID"/%.*s\n",
2601                 PFID(&op_data->op_fid1), (int)oldlen, old,
2602                 PFID(&op_data->op_fid2), (int)newlen, new);
2603
2604         rc = md_rename(tgt->ltd_exp, op_data, old, oldlen, new, newlen,
2605                         request);
2606         if (rc == -ENOENT && lmv_dir_retry_check_update(op_data)) {
2607                 ptlrpc_req_finished(*request);
2608                 *request = NULL;
2609                 goto retry;
2610         }
2611
2612         if (rc && rc != -EXDEV)
2613                 RETURN(rc);
2614
2615         body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
2616         if (body == NULL)
2617                 RETURN(-EPROTO);
2618
2619         /* Not cross-ref case, just get out of here. */
2620         if (likely(!(body->mbo_valid & OBD_MD_MDS)))
2621                 RETURN(rc);
2622
2623         op_data->op_fid4 = body->mbo_fid1;
2624
2625         ptlrpc_req_finished(*request);
2626         *request = NULL;
2627
2628         tgt = lmv_fid2tgt(lmv, &op_data->op_fid4);
2629         if (IS_ERR(tgt))
2630                 RETURN(PTR_ERR(tgt));
2631
2632         if (fid_is_sane(&op_data->op_fid4)) {
2633                 /* cancel LOOKUP lock of target on target parent */
2634                 if (tgt != tp_tgt) {
2635                         rc = lmv_early_cancel(exp, tp_tgt, op_data,
2636                                               tgt->ltd_index, LCK_EX,
2637                                               MDS_INODELOCK_LOOKUP,
2638                                               MF_MDC_CANCEL_FID4);
2639                         if (rc != 0)
2640                                 RETURN(rc);
2641                 }
2642         }
2643
2644         goto rename;
2645 }
2646
2647 static int lmv_setattr(struct obd_export *exp, struct md_op_data *op_data,
2648                        void *ea, size_t ealen, struct ptlrpc_request **request)
2649 {
2650         struct obd_device *obd = exp->exp_obd;
2651         struct lmv_obd *lmv = &obd->u.lmv;
2652         struct lmv_tgt_desc *tgt;
2653         int rc = 0;
2654
2655         ENTRY;
2656
2657         CDEBUG(D_INODE, "SETATTR for "DFID", valid 0x%x/0x%x\n",
2658                PFID(&op_data->op_fid1), op_data->op_attr.ia_valid,
2659                op_data->op_xvalid);
2660
2661         op_data->op_flags |= MF_MDC_CANCEL_FID1;
2662         tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
2663         if (IS_ERR(tgt))
2664                 RETURN(PTR_ERR(tgt));
2665
2666         rc = md_setattr(tgt->ltd_exp, op_data, ea, ealen, request);
2667
2668         RETURN(rc);
2669 }
2670
2671 static int lmv_fsync(struct obd_export *exp, const struct lu_fid *fid,
2672                      struct ptlrpc_request **request)
2673 {
2674         struct obd_device *obd = exp->exp_obd;
2675         struct lmv_obd *lmv = &obd->u.lmv;
2676         struct lmv_tgt_desc *tgt;
2677         int rc;
2678
2679         ENTRY;
2680
2681         tgt = lmv_fid2tgt(lmv, fid);
2682         if (IS_ERR(tgt))
2683                 RETURN(PTR_ERR(tgt));
2684
2685         rc = md_fsync(tgt->ltd_exp, fid, request);
2686         RETURN(rc);
2687 }
2688
2689 struct stripe_dirent {
2690         struct page             *sd_page;
2691         struct lu_dirpage       *sd_dp;
2692         struct lu_dirent        *sd_ent;
2693         bool                     sd_eof;
2694 };
2695
2696 struct lmv_dir_ctxt {
2697         struct lmv_obd          *ldc_lmv;
2698         struct md_op_data       *ldc_op_data;
2699         struct md_readdir_info  *ldc_mrinfo;
2700         __u64                    ldc_hash;
2701         int                      ldc_count;
2702         struct stripe_dirent     ldc_stripes[0];
2703 };
2704
2705 static inline void stripe_dirent_unload(struct stripe_dirent *stripe)
2706 {
2707         if (stripe->sd_page) {
2708                 kunmap(stripe->sd_page);
2709                 put_page(stripe->sd_page);
2710                 stripe->sd_page = NULL;
2711                 stripe->sd_ent = NULL;
2712         }
2713 }
2714
2715 static inline void put_lmv_dir_ctxt(struct lmv_dir_ctxt *ctxt)
2716 {
2717         int i;
2718
2719         for (i = 0; i < ctxt->ldc_count; i++)
2720                 stripe_dirent_unload(&ctxt->ldc_stripes[i]);
2721 }
2722
2723 /* if @ent is dummy, or . .., get next */
2724 static struct lu_dirent *stripe_dirent_get(struct lmv_dir_ctxt *ctxt,
2725                                            struct lu_dirent *ent,
2726                                            int stripe_index)
2727 {
2728         for (; ent; ent = lu_dirent_next(ent)) {
2729                 /* Skip dummy entry */
2730                 if (le16_to_cpu(ent->lde_namelen) == 0)
2731                         continue;
2732
2733                 /* skip . and .. for other stripes */
2734                 if (stripe_index &&
2735                     (strncmp(ent->lde_name, ".",
2736                              le16_to_cpu(ent->lde_namelen)) == 0 ||
2737                      strncmp(ent->lde_name, "..",
2738                              le16_to_cpu(ent->lde_namelen)) == 0))
2739                         continue;
2740
2741                 if (le64_to_cpu(ent->lde_hash) >= ctxt->ldc_hash)
2742                         break;
2743         }
2744
2745         return ent;
2746 }
2747
2748 static struct lu_dirent *stripe_dirent_load(struct lmv_dir_ctxt *ctxt,
2749                                             struct stripe_dirent *stripe,
2750                                             int stripe_index)
2751 {
2752         struct md_op_data *op_data = ctxt->ldc_op_data;
2753         struct lmv_oinfo *oinfo;
2754         struct lu_fid fid = op_data->op_fid1;
2755         struct inode *inode = op_data->op_data;
2756         struct lmv_tgt_desc *tgt;
2757         struct lu_dirent *ent = stripe->sd_ent;
2758         __u64 hash = ctxt->ldc_hash;
2759         int rc = 0;
2760
2761         ENTRY;
2762
2763         LASSERT(stripe == &ctxt->ldc_stripes[stripe_index]);
2764         LASSERT(!ent);
2765
2766         do {
2767                 if (stripe->sd_page) {
2768                         __u64 end = le64_to_cpu(stripe->sd_dp->ldp_hash_end);
2769
2770                         /* @hash should be the last dirent hash */
2771                         LASSERTF(hash <= end,
2772                                  "ctxt@%p stripe@%p hash %llx end %llx\n",
2773                                  ctxt, stripe, hash, end);
2774                         /* unload last page */
2775                         stripe_dirent_unload(stripe);
2776                         /* eof */
2777                         if (end == MDS_DIR_END_OFF) {
2778                                 stripe->sd_eof = true;
2779                                 break;
2780                         }
2781                         hash = end;
2782                 }
2783
2784                 oinfo = &op_data->op_mea1->lsm_md_oinfo[stripe_index];
2785                 if (!oinfo->lmo_root) {
2786                         rc = -ENOENT;
2787                         break;
2788                 }
2789
2790                 tgt = lmv_tgt(ctxt->ldc_lmv, oinfo->lmo_mds);
2791                 if (!tgt) {
2792                         rc = -ENODEV;
2793                         break;
2794                 }
2795
2796                 /* op_data is shared by stripes, reset after use */
2797                 op_data->op_fid1 = oinfo->lmo_fid;
2798                 op_data->op_fid2 = oinfo->lmo_fid;
2799                 op_data->op_data = oinfo->lmo_root;
2800
2801                 rc = md_read_page(tgt->ltd_exp, op_data, ctxt->ldc_mrinfo, hash,
2802                                   &stripe->sd_page);
2803
2804                 op_data->op_fid1 = fid;
2805                 op_data->op_fid2 = fid;
2806                 op_data->op_data = inode;
2807
2808                 if (rc)
2809                         break;
2810
2811                 stripe->sd_dp = page_address(stripe->sd_page);
2812                 ent = stripe_dirent_get(ctxt, lu_dirent_start(stripe->sd_dp),
2813                                         stripe_index);
2814                 /* in case a page filled with ., .. and dummy, read next */
2815         } while (!ent);
2816
2817         stripe->sd_ent = ent;
2818         if (rc) {
2819                 LASSERT(!ent);
2820                 /* treat error as eof, so dir can be partially accessed */
2821                 stripe->sd_eof = true;
2822                 ctxt->ldc_mrinfo->mr_partial_readdir_rc = rc;
2823                 LCONSOLE_WARN("dir "DFID" stripe %d readdir failed: %d, "
2824                               "directory is partially accessed!\n",
2825                               PFID(&ctxt->ldc_op_data->op_fid1), stripe_index,
2826                               rc);
2827         }
2828
2829         RETURN(ent);
2830 }
2831
2832 static int lmv_file_resync(struct obd_export *exp, struct md_op_data *data)
2833 {
2834         struct obd_device *obd = exp->exp_obd;
2835         struct lmv_obd *lmv = &obd->u.lmv;
2836         struct lmv_tgt_desc *tgt;
2837         int rc;
2838
2839         ENTRY;
2840
2841         rc = lmv_check_connect(obd);
2842         if (rc != 0)
2843                 RETURN(rc);
2844
2845         tgt = lmv_fid2tgt(lmv, &data->op_fid1);
2846         if (IS_ERR(tgt))
2847                 RETURN(PTR_ERR(tgt));
2848
2849         data->op_flags |= MF_MDC_CANCEL_FID1;
2850         rc = md_file_resync(tgt->ltd_exp, data);
2851         RETURN(rc);
2852 }
2853
2854 /**
2855  * Get dirent with the closest hash for striped directory
2856  *
2857  * This function will search the dir entry, whose hash value is the
2858  * closest(>=) to hash from all of sub-stripes, and it is only being called
2859  * for striped directory.
2860  *
2861  * \param[in] ctxt              dir read context
2862  *
2863  * \retval                      dirent get the entry successfully
2864  *                              NULL does not get the entry, normally it means
2865  *                              it reaches the end of the directory, while read
2866  *                              stripe dirent error is ignored to allow partial
2867  *                              access.
2868  */
2869 static struct lu_dirent *lmv_dirent_next(struct lmv_dir_ctxt *ctxt)
2870 {
2871         struct stripe_dirent *stripe;
2872         struct lu_dirent *ent = NULL;
2873         int i;
2874         int min = -1;
2875
2876         /* TODO: optimize with k-way merge sort */
2877         for (i = 0; i < ctxt->ldc_count; i++) {
2878                 stripe = &ctxt->ldc_stripes[i];
2879                 if (stripe->sd_eof)
2880                         continue;
2881
2882                 if (!stripe->sd_ent) {
2883                         stripe_dirent_load(ctxt, stripe, i);
2884                         if (!stripe->sd_ent) {
2885                                 LASSERT(stripe->sd_eof);
2886                                 continue;
2887                         }
2888                 }
2889
2890                 if (min == -1 ||
2891                     le64_to_cpu(ctxt->ldc_stripes[min].sd_ent->lde_hash) >
2892                     le64_to_cpu(stripe->sd_ent->lde_hash)) {
2893                         min = i;
2894                         if (le64_to_cpu(stripe->sd_ent->lde_hash) ==
2895                             ctxt->ldc_hash)
2896                                 break;
2897                 }
2898         }
2899
2900         if (min != -1) {
2901                 stripe = &ctxt->ldc_stripes[min];
2902                 ent = stripe->sd_ent;
2903                 /* pop found dirent */
2904                 stripe->sd_ent = stripe_dirent_get(ctxt, lu_dirent_next(ent),
2905                                                    min);
2906         }
2907
2908         return ent;
2909 }
2910
2911 /**
2912  * Build dir entry page for striped directory
2913  *
2914  * This function gets one entry by @offset from a striped directory. It will
2915  * read entries from all of stripes, and choose one closest to the required
2916  * offset(&offset). A few notes
2917  * 1. skip . and .. for non-zero stripes, because there can only have one .
2918  * and .. in a directory.
2919  * 2. op_data will be shared by all of stripes, instead of allocating new
2920  * one, so need to restore before reusing.
2921  *
2922  * \param[in] exp       obd export refer to LMV
2923  * \param[in] op_data   hold those MD parameters of read_entry
2924  * \param[in] mrinfo    ldlm callback being used in enqueue in mdc_read_entry,
2925  *                      and partial readdir result will be stored in it.
2926  * \param[in] offset    starting hash offset
2927  * \param[out] ppage    the page holding the entry. Note: because the entry
2928  *                      will be accessed in upper layer, so we need hold the
2929  *                      page until the usages of entry is finished, see
2930  *                      ll_dir_entry_next.
2931  *
2932  * retval               =0 if get entry successfully
2933  *                      <0 cannot get entry
2934  */
2935 static int lmv_striped_read_page(struct obd_export *exp,
2936                                  struct md_op_data *op_data,
2937                                  struct md_readdir_info *mrinfo, __u64 offset,
2938                                  struct page **ppage)
2939 {
2940         struct page *page = NULL;
2941         struct lu_dirpage *dp;
2942         void *start;
2943         struct lu_dirent *ent;
2944         struct lu_dirent *last_ent;
2945         int stripe_count;
2946         struct lmv_dir_ctxt *ctxt;
2947         struct lu_dirent *next = NULL;
2948         __u16 ent_size;
2949         size_t left_bytes;
2950         int rc = 0;
2951         ENTRY;
2952
2953         /* Allocate a page and read entries from all of stripes and fill
2954          * the page by hash order */
2955         page = alloc_page(GFP_KERNEL);
2956         if (!page)
2957                 RETURN(-ENOMEM);
2958
2959         /* Initialize the entry page */
2960         dp = kmap(page);
2961         memset(dp, 0, sizeof(*dp));
2962         dp->ldp_hash_start = cpu_to_le64(offset);
2963
2964         start = dp + 1;
2965         left_bytes = PAGE_SIZE - sizeof(*dp);
2966         ent = start;
2967         last_ent = ent;
2968
2969         /* initalize dir read context */
2970         stripe_count = op_data->op_mea1->lsm_md_stripe_count;
2971         OBD_ALLOC(ctxt, offsetof(typeof(*ctxt), ldc_stripes[stripe_count]));
2972         if (!ctxt)
2973                 GOTO(free_page, rc = -ENOMEM);
2974         ctxt->ldc_lmv = &exp->exp_obd->u.lmv;
2975         ctxt->ldc_op_data = op_data;
2976         ctxt->ldc_mrinfo = mrinfo;
2977         ctxt->ldc_hash = offset;
2978         ctxt->ldc_count = stripe_count;
2979
2980         while (1) {
2981                 next = lmv_dirent_next(ctxt);
2982
2983                 /* end of directory */
2984                 if (!next) {
2985                         ctxt->ldc_hash = MDS_DIR_END_OFF;
2986                         break;
2987                 }
2988                 ctxt->ldc_hash = le64_to_cpu(next->lde_hash);
2989
2990                 ent_size = le16_to_cpu(next->lde_reclen);
2991
2992                 /* the last entry lde_reclen is 0, but it might not be the last
2993                  * one of this temporay dir page */
2994                 if (!ent_size)
2995                         ent_size = lu_dirent_calc_size(
2996                                         le16_to_cpu(next->lde_namelen),
2997                                         le32_to_cpu(next->lde_attrs));
2998                 /* page full */
2999                 if (ent_size > left_bytes)
3000                         break;
3001
3002                 memcpy(ent, next, ent_size);
3003
3004                 /* Replace . with master FID and Replace .. with the parent FID
3005                  * of master object */
3006                 if (strncmp(ent->lde_name, ".",
3007                             le16_to_cpu(ent->lde_namelen)) == 0 &&
3008                     le16_to_cpu(ent->lde_namelen) == 1)
3009                         fid_cpu_to_le(&ent->lde_fid, &op_data->op_fid1);
3010                 else if (strncmp(ent->lde_name, "..",
3011                                    le16_to_cpu(ent->lde_namelen)) == 0 &&
3012                            le16_to_cpu(ent->lde_namelen) == 2)
3013                         fid_cpu_to_le(&ent->lde_fid, &op_data->op_fid3);
3014
3015                 CDEBUG(D_INODE, "entry %.*s hash %#llx\n",
3016                        le16_to_cpu(ent->lde_namelen), ent->lde_name,
3017                        le64_to_cpu(ent->lde_hash));
3018
3019                 left_bytes -= ent_size;
3020                 ent->lde_reclen = cpu_to_le16(ent_size);
3021                 last_ent = ent;
3022                 ent = (void *)ent + ent_size;
3023         };
3024
3025         last_ent->lde_reclen = 0;
3026
3027         if (ent == start)
3028                 dp->ldp_flags |= LDF_EMPTY;
3029         else if (ctxt->ldc_hash == le64_to_cpu(last_ent->lde_hash))
3030                 dp->ldp_flags |= LDF_COLLIDE;
3031         dp->ldp_flags = cpu_to_le32(dp->ldp_flags);
3032         dp->ldp_hash_end = cpu_to_le64(ctxt->ldc_hash);
3033
3034         put_lmv_dir_ctxt(ctxt);
3035         OBD_FREE(ctxt, offsetof(typeof(*ctxt), ldc_stripes[stripe_count]));
3036
3037         *ppage = page;
3038
3039         RETURN(0);
3040
3041 free_page:
3042         kunmap(page);
3043         __free_page(page);
3044
3045         return rc;
3046 }
3047
3048 static int lmv_read_page(struct obd_export *exp, struct md_op_data *op_data,
3049                          struct md_readdir_info *mrinfo, __u64 offset,
3050                          struct page **ppage)
3051 {
3052         struct obd_device *obd = exp->exp_obd;
3053         struct lmv_obd *lmv = &obd->u.lmv;
3054         struct lmv_tgt_desc *tgt;
3055         int rc;
3056
3057         ENTRY;
3058
3059         if (unlikely(lmv_dir_foreign(op_data->op_mea1)))
3060                 RETURN(-ENODATA);
3061
3062         if (unlikely(lmv_dir_striped(op_data->op_mea1))) {
3063                 rc = lmv_striped_read_page(exp, op_data, mrinfo, offset, ppage);
3064                 RETURN(rc);
3065         }
3066
3067         tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
3068         if (IS_ERR(tgt))
3069                 RETURN(PTR_ERR(tgt));
3070
3071         rc = md_read_page(tgt->ltd_exp, op_data, mrinfo, offset, ppage);
3072
3073         RETURN(rc);
3074 }
3075
3076 /**
3077  * Unlink a file/directory
3078  *
3079  * Unlink a file or directory under the parent dir. The unlink request
3080  * usually will be sent to the MDT where the child is located, but if
3081  * the client does not have the child FID then request will be sent to the
3082  * MDT where the parent is located.
3083  *
3084  * If the parent is a striped directory then it also needs to locate which
3085  * stripe the name of the child is located, and replace the parent FID
3086  * (@op->op_fid1) with the stripe FID. Note: if the stripe is unknown,
3087  * it will walk through all of sub-stripes until the child is being
3088  * unlinked finally.
3089  *
3090  * \param[in] exp       export refer to LMV
3091  * \param[in] op_data   different parameters transferred beween client
3092  *                      MD stacks, name, namelen, FIDs etc.
3093  *                      op_fid1 is the parent FID, op_fid2 is the child
3094  *                      FID.
3095  * \param[out] request  point to the request of unlink.
3096  *
3097  * retval               0 if succeed
3098  *                      negative errno if failed.
3099  */
3100 static int lmv_unlink(struct obd_export *exp, struct md_op_data *op_data,
3101                       struct ptlrpc_request **request)
3102 {
3103         struct obd_device *obd = exp->exp_obd;
3104         struct lmv_obd *lmv = &obd->u.lmv;
3105         struct lmv_tgt_desc *tgt;
3106         struct lmv_tgt_desc *parent_tgt;
3107         struct mdt_body *body;
3108         int rc;
3109
3110         ENTRY;
3111
3112         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
3113         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
3114         op_data->op_cap = current_cap();
3115
3116 retry:
3117         parent_tgt = lmv_locate_tgt(lmv, op_data);
3118         if (IS_ERR(parent_tgt))
3119                 RETURN(PTR_ERR(parent_tgt));
3120
3121         if (likely(!fid_is_zero(&op_data->op_fid2))) {
3122                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid2);
3123                 if (IS_ERR(tgt))
3124                         RETURN(PTR_ERR(tgt));
3125         } else {
3126                 tgt = parent_tgt;
3127         }
3128
3129         /*
3130          * If child's fid is given, cancel unused locks for it if it is from
3131          * another export than parent.
3132          *
3133          * LOOKUP lock for child (fid3) should also be cancelled on parent
3134          * tgt_tgt in mdc_unlink().
3135          */
3136         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
3137
3138         if (parent_tgt != tgt)
3139                 rc = lmv_early_cancel(exp, parent_tgt, op_data, tgt->ltd_index,
3140                                       LCK_EX, MDS_INODELOCK_LOOKUP,
3141                                       MF_MDC_CANCEL_FID3);
3142
3143         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_index, LCK_EX,
3144                               MDS_INODELOCK_ELC, MF_MDC_CANCEL_FID3);
3145         if (rc)
3146                 RETURN(rc);
3147
3148         CDEBUG(D_INODE, "unlink with fid="DFID"/"DFID" -> mds #%u\n",
3149                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2),
3150                tgt->ltd_index);
3151
3152         rc = md_unlink(tgt->ltd_exp, op_data, request);
3153         if (rc == -ENOENT && lmv_dir_retry_check_update(op_data)) {
3154                 ptlrpc_req_finished(*request);
3155                 *request = NULL;
3156                 goto retry;
3157         }
3158
3159         if (rc != -EREMOTE)
3160                 RETURN(rc);
3161
3162         body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
3163         if (body == NULL)
3164                 RETURN(-EPROTO);
3165
3166         /* Not cross-ref case, just get out of here. */
3167         if (likely(!(body->mbo_valid & OBD_MD_MDS)))
3168                 RETURN(rc);
3169
3170         /* This is a remote object, try remote MDT. */
3171         op_data->op_fid2 = body->mbo_fid1;
3172         ptlrpc_req_finished(*request);
3173         *request = NULL;
3174
3175         tgt = lmv_fid2tgt(lmv, &op_data->op_fid2);
3176         if (IS_ERR(tgt))
3177                 RETURN(PTR_ERR(tgt));
3178
3179         goto retry;
3180 }
3181
3182 static int lmv_precleanup(struct obd_device *obd)
3183 {
3184         ENTRY;
3185         libcfs_kkuc_group_rem(&obd->obd_uuid, 0, KUC_GRP_HSM);
3186         RETURN(0);
3187 }
3188
3189 /**
3190  * Get by key a value associated with a LMV device.
3191  *
3192  * Dispatch request to lower-layer devices as needed.
3193  *
3194  * \param[in] env               execution environment for this thread
3195  * \param[in] exp               export for the LMV device
3196  * \param[in] keylen            length of key identifier
3197  * \param[in] key               identifier of key to get value for
3198  * \param[in] vallen            size of \a val
3199  * \param[out] val              pointer to storage location for value
3200  * \param[in] lsm               optional striping metadata of object
3201  *
3202  * \retval 0            on success
3203  * \retval negative     negated errno on failure
3204  */
3205 static int lmv_get_info(const struct lu_env *env, struct obd_export *exp,
3206                         __u32 keylen, void *key, __u32 *vallen, void *val)
3207 {
3208         struct obd_device *obd;
3209         struct lmv_obd *lmv;
3210         struct lu_tgt_desc *tgt;
3211         int rc = 0;
3212
3213         ENTRY;
3214
3215         obd = class_exp2obd(exp);
3216         if (obd == NULL) {
3217                 CDEBUG(D_IOCTL, "Invalid client cookie %#llx\n",
3218                        exp->exp_handle.h_cookie);
3219                 RETURN(-EINVAL);
3220         }
3221
3222         lmv = &obd->u.lmv;
3223         if (keylen >= strlen("remote_flag") && !strcmp(key, "remote_flag")) {
3224                 LASSERT(*vallen == sizeof(__u32));
3225                 lmv_foreach_connected_tgt(lmv, tgt) {
3226                         if (!obd_get_info(env, tgt->ltd_exp, keylen, key,
3227                                           vallen, val))
3228                                 RETURN(0);
3229                 }
3230                 RETURN(-EINVAL);
3231         } else if (KEY_IS(KEY_MAX_EASIZE) ||
3232                    KEY_IS(KEY_DEFAULT_EASIZE) ||
3233                    KEY_IS(KEY_CONN_DATA)) {
3234                 /*
3235                  * Forwarding this request to first MDS, it should know LOV
3236                  * desc.
3237                  */
3238                 tgt = lmv_tgt(lmv, 0);
3239                 if (!tgt)
3240                         RETURN(-ENODEV);
3241
3242                 rc = obd_get_info(env, tgt->ltd_exp, keylen, key, vallen, val);
3243                 if (!rc && KEY_IS(KEY_CONN_DATA))
3244                         exp->exp_connect_data = *(struct obd_connect_data *)val;
3245                 RETURN(rc);
3246         } else if (KEY_IS(KEY_TGT_COUNT)) {
3247                 *((int *)val) = lmv->lmv_mdt_descs.ltd_tgts_size;
3248                 RETURN(0);
3249         }
3250
3251         CDEBUG(D_IOCTL, "Invalid key\n");
3252         RETURN(-EINVAL);
3253 }
3254
3255 static int lmv_rmfid(struct obd_export *exp, struct fid_array *fa,
3256                      int *__rcs, struct ptlrpc_request_set *_set)
3257 {
3258         struct obd_device *obd = class_exp2obd(exp);
3259         struct ptlrpc_request_set *set = _set;
3260         struct lmv_obd *lmv = &obd->u.lmv;
3261         int tgt_count = lmv->lmv_mdt_count;
3262         struct lu_tgt_desc *tgt;
3263         struct fid_array *fat, **fas = NULL;
3264         int i, rc, **rcs = NULL;
3265
3266         if (!set) {
3267                 set = ptlrpc_prep_set();
3268                 if (!set)
3269                         RETURN(-ENOMEM);
3270         }
3271
3272         /* split FIDs by targets */
3273         OBD_ALLOC_PTR_ARRAY(fas, tgt_count);
3274         if (fas == NULL)
3275                 GOTO(out, rc = -ENOMEM);
3276         OBD_ALLOC_PTR_ARRAY(rcs, tgt_count);
3277         if (rcs == NULL)
3278                 GOTO(out_fas, rc = -ENOMEM);
3279
3280         for (i = 0; i < fa->fa_nr; i++) {
3281                 unsigned int idx;
3282
3283                 rc = lmv_fld_lookup(lmv, &fa->fa_fids[i], &idx);
3284                 if (rc) {
3285                         CDEBUG(D_OTHER, "can't lookup "DFID": rc = %d\n",
3286                                PFID(&fa->fa_fids[i]), rc);
3287                         continue;
3288                 }
3289                 LASSERT(idx < tgt_count);
3290                 if (!fas[idx])
3291                         OBD_ALLOC(fas[idx], offsetof(struct fid_array,
3292                                   fa_fids[fa->fa_nr]));
3293                 if (!fas[idx])
3294                         GOTO(out, rc = -ENOMEM);
3295                 if (!rcs[idx])
3296                         OBD_ALLOC_PTR_ARRAY(rcs[idx], fa->fa_nr);
3297                 if (!rcs[idx])
3298                         GOTO(out, rc = -ENOMEM);
3299
3300                 fat = fas[idx];
3301                 fat->fa_fids[fat->fa_nr++] = fa->fa_fids[i];
3302         }
3303
3304         lmv_foreach_connected_tgt(lmv, tgt) {
3305                 fat = fas[tgt->ltd_index];
3306                 if (!fat || fat->fa_nr == 0)
3307                         continue;
3308                 rc = md_rmfid(tgt->ltd_exp, fat, rcs[tgt->ltd_index], set);
3309         }
3310
3311         rc = ptlrpc_set_wait(NULL, set);
3312         if (rc == 0) {
3313                 int j = 0;
3314                 for (i = 0; i < tgt_count; i++) {
3315                         fat = fas[i];
3316                         if (!fat || fat->fa_nr == 0)
3317                                 continue;
3318                         /* copy FIDs back */
3319                         memcpy(fa->fa_fids + j, fat->fa_fids,
3320                                fat->fa_nr * sizeof(struct lu_fid));
3321                         /* copy rcs back */
3322                         memcpy(__rcs + j, rcs[i], fat->fa_nr * sizeof(**rcs));
3323                         j += fat->fa_nr;
3324                 }
3325         }
3326         if (set != _set)
3327                 ptlrpc_set_destroy(set);
3328
3329 out:
3330         for (i = 0; i < tgt_count; i++) {
3331                 if (fas && fas[i])
3332                         OBD_FREE(fas[i], offsetof(struct fid_array,
3333                                                 fa_fids[fa->fa_nr]));
3334                 if (rcs && rcs[i])
3335                         OBD_FREE_PTR_ARRAY(rcs[i], fa->fa_nr);
3336         }
3337         if (rcs)
3338                 OBD_FREE_PTR_ARRAY(rcs, tgt_count);
3339 out_fas:
3340         if (fas)
3341                 OBD_FREE_PTR_ARRAY(fas, tgt_count);
3342
3343         RETURN(rc);
3344 }
3345
3346 /**
3347  * Asynchronously set by key a value associated with a LMV device.
3348  *
3349  * Dispatch request to lower-layer devices as needed.
3350  *
3351  * \param[in] env       execution environment for this thread
3352  * \param[in] exp       export for the LMV device
3353  * \param[in] keylen    length of key identifier
3354  * \param[in] key       identifier of key to store value for
3355  * \param[in] vallen    size of value to store
3356  * \param[in] val       pointer to data to be stored
3357  * \param[in] set       optional list of related ptlrpc requests
3358  *
3359  * \retval 0            on success
3360  * \retval negative     negated errno on failure
3361  */
3362 static int lmv_set_info_async(const struct lu_env *env, struct obd_export *exp,
3363                               __u32 keylen, void *key, __u32 vallen, void *val,
3364                               struct ptlrpc_request_set *set)
3365 {
3366         struct lmv_tgt_desc *tgt;
3367         struct obd_device *obd;
3368         struct lmv_obd *lmv;
3369         int rc = 0;
3370         ENTRY;
3371
3372         obd = class_exp2obd(exp);
3373         if (obd == NULL) {
3374                 CDEBUG(D_IOCTL, "Invalid client cookie %#llx\n",
3375                        exp->exp_handle.h_cookie);
3376                 RETURN(-EINVAL);
3377         }
3378         lmv = &obd->u.lmv;
3379
3380         if (KEY_IS(KEY_READ_ONLY) || KEY_IS(KEY_FLUSH_CTX) ||
3381             KEY_IS(KEY_DEFAULT_EASIZE)) {
3382                 int err = 0;
3383
3384                 lmv_foreach_connected_tgt(lmv, tgt) {
3385                         err = obd_set_info_async(env, tgt->ltd_exp,
3386                                                  keylen, key, vallen, val, set);
3387                         if (err && rc == 0)
3388                                 rc = err;
3389                 }
3390
3391                 RETURN(rc);
3392         }
3393
3394         RETURN(-EINVAL);
3395 }
3396
3397 static int lmv_unpack_md_v1(struct obd_export *exp, struct lmv_stripe_md *lsm,
3398                             const struct lmv_mds_md_v1 *lmm1)
3399 {
3400         struct lmv_obd  *lmv = &exp->exp_obd->u.lmv;
3401         int             stripe_count;
3402         int             cplen;
3403         int             i;
3404         int             rc = 0;
3405         ENTRY;
3406
3407         lsm->lsm_md_magic = le32_to_cpu(lmm1->lmv_magic);
3408         lsm->lsm_md_stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
3409         lsm->lsm_md_master_mdt_index = le32_to_cpu(lmm1->lmv_master_mdt_index);
3410         if (CFS_FAIL_CHECK(OBD_FAIL_LMV_UNKNOWN_STRIPE))
3411                 lsm->lsm_md_hash_type = cfs_fail_val ?: LMV_HASH_TYPE_UNKNOWN;
3412         else
3413                 lsm->lsm_md_hash_type = le32_to_cpu(lmm1->lmv_hash_type);
3414         lsm->lsm_md_layout_version = le32_to_cpu(lmm1->lmv_layout_version);
3415         lsm->lsm_md_migrate_offset = le32_to_cpu(lmm1->lmv_migrate_offset);
3416         lsm->lsm_md_migrate_hash = le32_to_cpu(lmm1->lmv_migrate_hash);
3417         cplen = strlcpy(lsm->lsm_md_pool_name, lmm1->lmv_pool_name,
3418                         sizeof(lsm->lsm_md_pool_name));
3419
3420         if (cplen >= sizeof(lsm->lsm_md_pool_name))
3421                 RETURN(-E2BIG);
3422
3423         CDEBUG(D_INFO, "unpack lsm count %d/%d, master %d hash_type %#x/%#x "
3424                "layout_version %d\n", lsm->lsm_md_stripe_count,
3425                lsm->lsm_md_migrate_offset, lsm->lsm_md_master_mdt_index,
3426                lsm->lsm_md_hash_type, lsm->lsm_md_migrate_hash,
3427                lsm->lsm_md_layout_version);
3428
3429         stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
3430         for (i = 0; i < stripe_count; i++) {
3431                 fid_le_to_cpu(&lsm->lsm_md_oinfo[i].lmo_fid,
3432                               &lmm1->lmv_stripe_fids[i]);
3433                 /*
3434                  * set default value -1, so lmv_locate_tgt() knows this stripe
3435                  * target is not initialized.
3436                  */
3437                 lsm->lsm_md_oinfo[i].lmo_mds = LMV_OFFSET_DEFAULT;
3438                 if (!fid_is_sane(&lsm->lsm_md_oinfo[i].lmo_fid))
3439                         continue;
3440
3441                 rc = lmv_fld_lookup(lmv, &lsm->lsm_md_oinfo[i].lmo_fid,
3442                                     &lsm->lsm_md_oinfo[i].lmo_mds);
3443                 if (rc == -ENOENT)
3444                         continue;
3445
3446                 if (rc)
3447                         RETURN(rc);
3448
3449                 CDEBUG(D_INFO, "unpack fid #%d "DFID"\n", i,
3450                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid));
3451         }
3452
3453         RETURN(rc);
3454 }
3455
3456 static inline int lmv_unpack_user_md(struct obd_export *exp,
3457                                      struct lmv_stripe_md *lsm,
3458                                      const struct lmv_user_md *lmu)
3459 {
3460         lsm->lsm_md_magic = le32_to_cpu(lmu->lum_magic);
3461         lsm->lsm_md_stripe_count = le32_to_cpu(lmu->lum_stripe_count);
3462         lsm->lsm_md_master_mdt_index = le32_to_cpu(lmu->lum_stripe_offset);
3463         lsm->lsm_md_hash_type = le32_to_cpu(lmu->lum_hash_type);
3464         lsm->lsm_md_max_inherit = lmu->lum_max_inherit;
3465         lsm->lsm_md_max_inherit_rr = lmu->lum_max_inherit_rr;
3466         lsm->lsm_md_pool_name[LOV_MAXPOOLNAME] = 0;
3467
3468         return 0;
3469 }
3470
3471 static int lmv_unpackmd(struct obd_export *exp, struct lmv_stripe_md **lsmp,
3472                         const union lmv_mds_md *lmm, size_t lmm_size)
3473 {
3474         struct lmv_stripe_md     *lsm;
3475         int                      lsm_size;
3476         int                      rc;
3477         bool                     allocated = false;
3478         ENTRY;
3479
3480         LASSERT(lsmp != NULL);
3481
3482         lsm = *lsmp;
3483         /* Free memmd */
3484         if (lsm != NULL && lmm == NULL) {
3485                 int i;
3486                 struct lmv_foreign_md *lfm = (struct lmv_foreign_md *)lsm;
3487
3488                 if (lfm->lfm_magic == LMV_MAGIC_FOREIGN) {
3489                         size_t lfm_size;
3490
3491                         lfm_size = lfm->lfm_length + offsetof(typeof(*lfm),
3492                                                               lfm_value[0]);
3493                         OBD_FREE_LARGE(lfm, lfm_size);
3494                         RETURN(0);
3495                 }
3496
3497                 if (lmv_dir_striped(lsm)) {
3498                         for (i = 0; i < lsm->lsm_md_stripe_count; i++)
3499                                 iput(lsm->lsm_md_oinfo[i].lmo_root);
3500                         lsm_size = lmv_stripe_md_size(lsm->lsm_md_stripe_count);
3501                 } else {
3502                         lsm_size = lmv_stripe_md_size(0);
3503                 }
3504                 OBD_FREE(lsm, lsm_size);
3505                 *lsmp = NULL;
3506                 RETURN(0);
3507         }
3508
3509         /* foreign lmv case */
3510         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_FOREIGN) {
3511                 struct lmv_foreign_md *lfm = (struct lmv_foreign_md *)lsm;
3512
3513                 if (lfm == NULL) {
3514                         OBD_ALLOC_LARGE(lfm, lmm_size);
3515                         if (lfm == NULL)
3516                                 RETURN(-ENOMEM);
3517                         *lsmp = (struct lmv_stripe_md *)lfm;
3518                 }
3519                 lfm->lfm_magic = le32_to_cpu(lmm->lmv_foreign_md.lfm_magic);
3520                 lfm->lfm_length = le32_to_cpu(lmm->lmv_foreign_md.lfm_length);
3521                 lfm->lfm_type = le32_to_cpu(lmm->lmv_foreign_md.lfm_type);
3522                 lfm->lfm_flags = le32_to_cpu(lmm->lmv_foreign_md.lfm_flags);
3523                 memcpy(&lfm->lfm_value, &lmm->lmv_foreign_md.lfm_value,
3524                        lfm->lfm_length);
3525                 RETURN(lmm_size);
3526         }
3527
3528         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE)
3529                 RETURN(-EPERM);
3530
3531         /* Unpack memmd */
3532         if (le32_to_cpu(lmm->lmv_magic) != LMV_MAGIC_V1 &&
3533             le32_to_cpu(lmm->lmv_magic) != LMV_USER_MAGIC) {
3534                 CERROR("%s: invalid lmv magic %x: rc = %d\n",
3535                        exp->exp_obd->obd_name, le32_to_cpu(lmm->lmv_magic),
3536                        -EIO);
3537                 RETURN(-EIO);
3538         }
3539
3540         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_V1)
3541                 lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
3542         else
3543                 /**
3544                  * Unpack default dirstripe(lmv_user_md) to lmv_stripe_md,
3545                  * stripecount should be 0 then.
3546                  */
3547                 lsm_size = lmv_stripe_md_size(0);
3548
3549         if (lsm == NULL) {
3550                 OBD_ALLOC(lsm, lsm_size);
3551                 if (lsm == NULL)
3552                         RETURN(-ENOMEM);
3553                 allocated = true;
3554                 *lsmp = lsm;
3555         }
3556
3557         switch (le32_to_cpu(lmm->lmv_magic)) {
3558         case LMV_MAGIC_V1:
3559                 rc = lmv_unpack_md_v1(exp, lsm, &lmm->lmv_md_v1);
3560                 break;
3561         case LMV_USER_MAGIC:
3562                 rc = lmv_unpack_user_md(exp, lsm, &lmm->lmv_user_md);
3563                 break;
3564         default:
3565                 CERROR("%s: unrecognized magic %x\n", exp->exp_obd->obd_name,
3566                        le32_to_cpu(lmm->lmv_magic));
3567                 rc = -EINVAL;
3568                 break;
3569         }
3570
3571         if (rc != 0 && allocated) {
3572                 OBD_FREE(lsm, lsm_size);
3573                 *lsmp = NULL;
3574                 lsm_size = rc;
3575         }
3576         RETURN(lsm_size);
3577 }
3578
3579 void lmv_free_memmd(struct lmv_stripe_md *lsm)
3580 {
3581         lmv_unpackmd(NULL, &lsm, NULL, 0);
3582 }
3583 EXPORT_SYMBOL(lmv_free_memmd);
3584
3585 static int lmv_cancel_unused(struct obd_export *exp, const struct lu_fid *fid,
3586                              union ldlm_policy_data *policy,
3587                              enum ldlm_mode mode, enum ldlm_cancel_flags flags,
3588                              void *opaque)
3589 {
3590         struct lmv_obd *lmv = &exp->exp_obd->u.lmv;
3591         struct lu_tgt_desc *tgt;
3592         int err;
3593         int rc = 0;
3594
3595         ENTRY;
3596
3597         LASSERT(fid != NULL);
3598
3599         lmv_foreach_connected_tgt(lmv, tgt) {
3600                 if (!tgt->ltd_active)
3601                         continue;
3602
3603                 err = md_cancel_unused(tgt->ltd_exp, fid, policy, mode, flags,
3604                                        opaque);
3605                 if (!rc)
3606                         rc = err;
3607         }
3608         RETURN(rc);
3609 }
3610
3611 static int lmv_set_lock_data(struct obd_export *exp,
3612                              const struct lustre_handle *lockh,
3613                              void *data, __u64 *bits)
3614 {
3615         struct lmv_obd *lmv = &exp->exp_obd->u.lmv;
3616         struct lmv_tgt_desc *tgt = lmv_tgt(lmv, 0);
3617         int rc;
3618
3619         ENTRY;
3620
3621         if (tgt == NULL || tgt->ltd_exp == NULL)
3622                 RETURN(-EINVAL);
3623         rc =  md_set_lock_data(tgt->ltd_exp, lockh, data, bits);
3624         RETURN(rc);
3625 }
3626
3627 static enum ldlm_mode
3628 lmv_lock_match(struct obd_export *exp, __u64 flags,
3629                const struct lu_fid *fid, enum ldlm_type type,
3630                union ldlm_policy_data *policy,
3631                enum ldlm_mode mode, struct lustre_handle *lockh)
3632 {
3633         struct obd_device *obd = exp->exp_obd;
3634         struct lmv_obd *lmv = &obd->u.lmv;
3635         struct lu_tgt_desc *tgt;
3636         __u64 bits = policy->l_inodebits.bits;
3637         enum ldlm_mode rc = LCK_MINMODE;
3638         int index;
3639         int i;
3640
3641         /* only one bit is set */
3642         LASSERT(bits && !(bits & (bits - 1)));
3643         /* With DNE every object can have two locks in different namespaces:
3644          * lookup lock in space of MDT storing direntry and update/open lock in
3645          * space of MDT storing inode.  Try the MDT that the FID maps to first,
3646          * since this can be easily found, and only try others if that fails.
3647          */
3648         if (bits == MDS_INODELOCK_LOOKUP) {
3649                 for (i = 0, index = lmv_fid2tgt_index(lmv, fid);
3650                      i < lmv->lmv_mdt_descs.ltd_tgts_size; i++,
3651                      index = (index + 1) % lmv->lmv_mdt_descs.ltd_tgts_size) {
3652                         if (index < 0) {
3653                                 CDEBUG(D_HA,
3654                                        "%s: "DFID" is inaccessible: rc = %d\n",
3655                                        obd->obd_name, PFID(fid), index);
3656                                 index = 0;
3657                         }
3658                         tgt = lmv_tgt(lmv, index);
3659                         if (!tgt || !tgt->ltd_exp || !tgt->ltd_active)
3660                                 continue;
3661                         rc = md_lock_match(tgt->ltd_exp, flags, fid, type,
3662                                            policy, mode, lockh);
3663                         if (rc)
3664                                 break;
3665                 }
3666         } else {
3667                 tgt = lmv_fid2tgt(lmv, fid);
3668                 if (!IS_ERR(tgt) && tgt->ltd_exp && tgt->ltd_active)
3669                         rc = md_lock_match(tgt->ltd_exp, flags, fid, type,
3670                                            policy, mode, lockh);
3671         }
3672
3673         CDEBUG(D_INODE, "Lock match for "DFID": %d\n", PFID(fid), rc);
3674
3675         return rc;
3676 }
3677
3678 static int
3679 lmv_get_lustre_md(struct obd_export *exp, struct req_capsule *pill,
3680                   struct obd_export *dt_exp, struct obd_export *md_exp,
3681                   struct lustre_md *md)
3682 {
3683         struct lmv_obd *lmv = &exp->exp_obd->u.lmv;
3684         struct lmv_tgt_desc *tgt = lmv_tgt(lmv, 0);
3685
3686         if (!tgt || !tgt->ltd_exp)
3687                 return -EINVAL;
3688
3689         return md_get_lustre_md(tgt->ltd_exp, pill, dt_exp, md_exp, md);
3690 }
3691
3692 static int lmv_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
3693 {
3694         struct obd_device *obd = exp->exp_obd;
3695         struct lmv_obd *lmv = &obd->u.lmv;
3696         struct lmv_tgt_desc *tgt = lmv_tgt(lmv, 0);
3697
3698         ENTRY;
3699
3700         if (md->default_lmv) {
3701                 lmv_free_memmd(md->default_lmv);
3702                 md->default_lmv = NULL;
3703         }
3704         if (md->lmv != NULL) {
3705                 lmv_free_memmd(md->lmv);
3706                 md->lmv = NULL;
3707         }
3708         if (!tgt || !tgt->ltd_exp)
3709                 RETURN(-EINVAL);
3710         RETURN(md_free_lustre_md(tgt->ltd_exp, md));
3711 }
3712
3713 static int lmv_set_open_replay_data(struct obd_export *exp,
3714                                     struct obd_client_handle *och,
3715                                     struct lookup_intent *it)
3716 {
3717         struct obd_device *obd = exp->exp_obd;
3718         struct lmv_obd *lmv = &obd->u.lmv;
3719         struct lmv_tgt_desc *tgt;
3720
3721         ENTRY;
3722
3723         tgt = lmv_fid2tgt(lmv, &och->och_fid);
3724         if (IS_ERR(tgt))
3725                 RETURN(PTR_ERR(tgt));
3726
3727         RETURN(md_set_open_replay_data(tgt->ltd_exp, och, it));
3728 }
3729
3730 static int lmv_clear_open_replay_data(struct obd_export *exp,
3731                                       struct obd_client_handle *och)
3732 {
3733         struct obd_device *obd = exp->exp_obd;
3734         struct lmv_obd *lmv = &obd->u.lmv;
3735         struct lmv_tgt_desc *tgt;
3736
3737         ENTRY;
3738
3739         tgt = lmv_fid2tgt(lmv, &och->och_fid);
3740         if (IS_ERR(tgt))
3741                 RETURN(PTR_ERR(tgt));
3742
3743         RETURN(md_clear_open_replay_data(tgt->ltd_exp, och));
3744 }
3745
3746 static int lmv_intent_getattr_async(struct obd_export *exp,
3747                                     struct md_op_item *item)
3748 {
3749         struct md_op_data *op_data = &item->mop_data;
3750         struct obd_device *obd = exp->exp_obd;
3751         struct lmv_obd *lmv = &obd->u.lmv;
3752         struct lmv_tgt_desc *ptgt;
3753         struct lmv_tgt_desc *ctgt;
3754         int rc;
3755
3756         ENTRY;
3757
3758         if (!fid_is_sane(&op_data->op_fid2))
3759                 RETURN(-EINVAL);
3760
3761         ptgt = lmv_locate_tgt(lmv, op_data);
3762         if (IS_ERR(ptgt))
3763                 RETURN(PTR_ERR(ptgt));
3764
3765         ctgt = lmv_fid2tgt(lmv, &op_data->op_fid2);
3766         if (IS_ERR(ctgt))
3767                 RETURN(PTR_ERR(ctgt));
3768
3769         /*
3770          * remote object needs two RPCs to lookup and getattr, considering the
3771          * complexity don't support statahead for now.
3772          */
3773         if (ctgt != ptgt)
3774                 RETURN(-EREMOTE);
3775
3776         rc = md_intent_getattr_async(ptgt->ltd_exp, item);
3777
3778         RETURN(rc);
3779 }
3780
3781 static int lmv_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
3782                                struct lu_fid *fid, __u64 *bits)
3783 {
3784         struct obd_device *obd = exp->exp_obd;
3785         struct lmv_obd *lmv = &obd->u.lmv;
3786         struct lmv_tgt_desc *tgt;
3787         int rc;
3788
3789         ENTRY;
3790
3791         tgt = lmv_fid2tgt(lmv, fid);
3792         if (IS_ERR(tgt))
3793                 RETURN(PTR_ERR(tgt));
3794
3795         rc = md_revalidate_lock(tgt->ltd_exp, it, fid, bits);
3796         RETURN(rc);
3797 }
3798
3799 static int lmv_get_fid_from_lsm(struct obd_export *exp,
3800                                 const struct lmv_stripe_md *lsm,
3801                                 const char *name, int namelen,
3802                                 struct lu_fid *fid)
3803 {
3804         const struct lmv_oinfo *oinfo;
3805
3806         if (!lmv_dir_striped(lsm))
3807                 RETURN(-ESTALE);
3808
3809         oinfo = lsm_name_to_stripe_info(lsm, name, namelen, false);
3810         if (IS_ERR(oinfo))
3811                 return PTR_ERR(oinfo);
3812
3813         *fid = oinfo->lmo_fid;
3814
3815         RETURN(0);
3816 }
3817
3818 /**
3819  * For lmv, only need to send request to master MDT, and the master MDT will
3820  * process with other slave MDTs. The only exception is Q_GETOQUOTA for which
3821  * we directly fetch data from the slave MDTs.
3822  */
3823 static int lmv_quotactl(struct obd_device *unused, struct obd_export *exp,
3824                         struct obd_quotactl *oqctl)
3825 {
3826         struct obd_device *obd = class_exp2obd(exp);
3827         struct lmv_obd *lmv = &obd->u.lmv;
3828         struct lmv_tgt_desc *tgt = lmv_tgt(lmv, 0);
3829         __u64 curspace, curinodes;
3830         int rc = 0;
3831
3832         ENTRY;
3833
3834         if (!tgt || !tgt->ltd_exp || !tgt->ltd_active) {
3835                 CERROR("master lmv inactive\n");
3836                 RETURN(-EIO);
3837         }
3838
3839         if (oqctl->qc_cmd != Q_GETOQUOTA) {
3840                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
3841                 RETURN(rc);
3842         }
3843
3844         curspace = curinodes = 0;
3845         lmv_foreach_connected_tgt(lmv, tgt) {
3846                 int err;
3847
3848                 if (!tgt->ltd_active)
3849                         continue;
3850
3851                 err = obd_quotactl(tgt->ltd_exp, oqctl);
3852                 if (err) {
3853                         CERROR("getquota on mdt %d failed. %d\n",
3854                                tgt->ltd_index, err);
3855                         if (!rc)
3856                                 rc = err;
3857                 } else {
3858                         curspace += oqctl->qc_dqblk.dqb_curspace;
3859                         curinodes += oqctl->qc_dqblk.dqb_curinodes;
3860                 }
3861         }
3862         oqctl->qc_dqblk.dqb_curspace = curspace;
3863         oqctl->qc_dqblk.dqb_curinodes = curinodes;
3864
3865         RETURN(rc);
3866 }
3867
3868 static int lmv_merge_attr(struct obd_export *exp,
3869                           const struct lmv_stripe_md *lsm,
3870                           struct cl_attr *attr,
3871                           ldlm_blocking_callback cb_blocking)
3872 {
3873         int rc;
3874         int i;
3875
3876         if (!lmv_dir_striped(lsm))
3877                 return 0;
3878
3879         rc = lmv_revalidate_slaves(exp, lsm, cb_blocking, 0);
3880         if (rc < 0)
3881                 return rc;
3882
3883         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
3884                 struct inode *inode = lsm->lsm_md_oinfo[i].lmo_root;
3885
3886                 if (!inode)
3887                         continue;
3888
3889                 CDEBUG(D_INFO,
3890                        "" DFID " size %llu, blocks %llu nlink %u, atime %lld ctime %lld, mtime %lld.\n",
3891                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid),
3892                        i_size_read(inode), (unsigned long long)inode->i_blocks,
3893                        inode->i_nlink, (s64)inode->i_atime.tv_sec,
3894                        (s64)inode->i_ctime.tv_sec, (s64)inode->i_mtime.tv_sec);
3895
3896                 /* for slave stripe, it needs to subtract nlink for . and .. */
3897                 if (i != 0)
3898                         attr->cat_nlink += inode->i_nlink - 2;
3899                 else
3900                         attr->cat_nlink = inode->i_nlink;
3901
3902                 attr->cat_size += i_size_read(inode);
3903                 attr->cat_blocks += inode->i_blocks;
3904
3905                 if (attr->cat_atime < inode->i_atime.tv_sec)
3906                         attr->cat_atime = inode->i_atime.tv_sec;
3907
3908                 if (attr->cat_ctime < inode->i_ctime.tv_sec)
3909                         attr->cat_ctime = inode->i_ctime.tv_sec;
3910
3911                 if (attr->cat_mtime < inode->i_mtime.tv_sec)
3912                         attr->cat_mtime = inode->i_mtime.tv_sec;
3913         }
3914         return 0;
3915 }
3916
3917 static struct lu_batch *lmv_batch_create(struct obd_export *exp,
3918                                          enum lu_batch_flags flags,
3919                                          __u32 max_count)
3920 {
3921         struct lu_batch *bh;
3922         struct lmv_batch *lbh;
3923
3924         ENTRY;
3925         OBD_ALLOC_PTR(lbh);
3926         if (!lbh)
3927                 RETURN(ERR_PTR(-ENOMEM));
3928
3929         bh = &lbh->lbh_super;
3930         bh->lbt_flags = flags;
3931         bh->lbt_max_count = max_count;
3932
3933         if (flags & BATCH_FL_RQSET) {
3934                 bh->lbt_rqset = ptlrpc_prep_set();
3935                 if (bh->lbt_rqset == NULL) {
3936                         OBD_FREE_PTR(lbh);
3937                         RETURN(ERR_PTR(-ENOMEM));
3938                 }
3939         }
3940
3941         INIT_LIST_HEAD(&lbh->lbh_sub_batch_list);
3942         RETURN(bh);
3943 }
3944
3945 static int lmv_batch_stop(struct obd_export *exp, struct lu_batch *bh)
3946 {
3947         struct lmv_batch *lbh;
3948         struct lmvsub_batch *sub;
3949         struct lmvsub_batch *tmp;
3950         int rc = 0;
3951
3952         ENTRY;
3953
3954         lbh = container_of(bh, struct lmv_batch, lbh_super);
3955         list_for_each_entry_safe(sub, tmp, &lbh->lbh_sub_batch_list,
3956                                  sbh_sub_item) {
3957                 list_del(&sub->sbh_sub_item);
3958                 rc = md_batch_stop(sub->sbh_tgt->ltd_exp, sub->sbh_sub);
3959                 if (rc < 0) {
3960                         CERROR("%s: stop batch processing failed: rc = %d\n",
3961                                exp->exp_obd->obd_name, rc);
3962                         if (bh->lbt_result == 0)
3963                                 bh->lbt_result = rc;
3964                 }
3965                 OBD_FREE_PTR(sub);
3966         }
3967
3968         if (bh->lbt_flags & BATCH_FL_RQSET) {
3969                 rc = ptlrpc_set_wait(NULL, bh->lbt_rqset);
3970                 ptlrpc_set_destroy(bh->lbt_rqset);
3971         }
3972
3973         OBD_FREE_PTR(lbh);
3974         RETURN(rc);
3975 }
3976
3977 static int lmv_batch_flush(struct obd_export *exp, struct lu_batch *bh,
3978                            bool wait)
3979 {
3980         struct lmv_batch *lbh;
3981         struct lmvsub_batch *sub;
3982         int rc = 0;
3983         int rc1;
3984
3985         ENTRY;
3986
3987         lbh = container_of(bh, struct lmv_batch, lbh_super);
3988         list_for_each_entry(sub, &lbh->lbh_sub_batch_list, sbh_sub_item) {
3989                 rc1 = md_batch_flush(sub->sbh_tgt->ltd_exp, sub->sbh_sub, wait);
3990                 if (rc1 < 0) {
3991                         CERROR("%s: stop batch processing failed: rc = %d\n",
3992                                exp->exp_obd->obd_name, rc);
3993                         if (bh->lbt_result == 0)
3994                                 bh->lbt_result = rc;
3995
3996                         if (rc == 0)
3997                                 rc = rc1;
3998                 }
3999         }
4000
4001         if (wait && bh->lbt_flags & BATCH_FL_RQSET) {
4002                 rc1 = ptlrpc_set_wait(NULL, bh->lbt_rqset);
4003                 if (rc == 0)
4004                         rc = rc1;
4005         }
4006
4007         RETURN(rc);
4008 }
4009
4010 static inline struct lmv_tgt_desc *
4011 lmv_batch_locate_tgt(struct lmv_obd *lmv, struct md_op_item *item)
4012 {
4013         struct md_op_data *op_data = &item->mop_data;
4014         struct lmv_tgt_desc *tgt;
4015
4016         switch (item->mop_opc) {
4017         case MD_OP_GETATTR: {
4018                 struct lmv_tgt_desc *ptgt;
4019
4020                 if (!fid_is_sane(&op_data->op_fid2))
4021                         RETURN(ERR_PTR(-EINVAL));
4022
4023                 ptgt = lmv_locate_tgt(lmv, op_data);
4024                 if (IS_ERR(ptgt))
4025                         RETURN(ptgt);
4026
4027                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid2);
4028                 if (IS_ERR(tgt))
4029                         RETURN(tgt);
4030
4031                 /*
4032                  * Remote object needs two RPCs to lookup and getattr,
4033                  * considering the complexity don't support statahead for now.
4034                  */
4035                 if (tgt != ptgt)
4036                         RETURN(ERR_PTR(-EREMOTE));
4037
4038                 break;
4039         }
4040         default:
4041                 tgt = ERR_PTR(-ENOTSUPP);
4042         }
4043
4044         return tgt;
4045 }
4046
4047 struct lu_batch *lmv_batch_lookup_sub(struct lmv_batch *lbh,
4048                                       struct lmv_tgt_desc *tgt)
4049 {
4050         struct lmvsub_batch *sub;
4051
4052         list_for_each_entry(sub, &lbh->lbh_sub_batch_list, sbh_sub_item) {
4053                 if (sub->sbh_tgt == tgt)
4054                         return sub->sbh_sub;
4055         }
4056
4057         return NULL;
4058 }
4059
4060 struct lu_batch *lmv_batch_get_sub(struct lmv_batch *lbh,
4061                                    struct lmv_tgt_desc *tgt)
4062 {
4063         struct lmvsub_batch *sbh;
4064         struct lu_batch *child_bh;
4065         struct lu_batch *bh;
4066
4067         ENTRY;
4068
4069         child_bh = lmv_batch_lookup_sub(lbh, tgt);
4070         if (child_bh != NULL)
4071                 RETURN(child_bh);
4072
4073         OBD_ALLOC_PTR(sbh);
4074         if (sbh == NULL)
4075                 RETURN(ERR_PTR(-ENOMEM));
4076
4077         INIT_LIST_HEAD(&sbh->sbh_sub_item);
4078         sbh->sbh_tgt = tgt;
4079
4080         bh = &lbh->lbh_super;
4081         child_bh = md_batch_create(tgt->ltd_exp, bh->lbt_flags,
4082                                    bh->lbt_max_count);
4083         if (IS_ERR(child_bh)) {
4084                 OBD_FREE_PTR(sbh);
4085                 RETURN(child_bh);
4086         }
4087
4088         child_bh->lbt_rqset = bh->lbt_rqset;
4089         sbh->sbh_sub = child_bh;
4090         list_add(&sbh->sbh_sub_item, &lbh->lbh_sub_batch_list);
4091         RETURN(child_bh);
4092 }
4093
4094 static int lmv_batch_add(struct obd_export *exp, struct lu_batch *bh,
4095                          struct md_op_item *item)
4096 {
4097         struct obd_device *obd = exp->exp_obd;
4098         struct lmv_obd *lmv = &obd->u.lmv;
4099         struct lmv_tgt_desc *tgt;
4100         struct lmv_batch *lbh;
4101         struct lu_batch *child_bh;
4102         int rc;
4103
4104         ENTRY;
4105
4106         tgt = lmv_batch_locate_tgt(lmv, item);
4107         if (IS_ERR(tgt))
4108                 RETURN(PTR_ERR(tgt));
4109
4110         lbh = container_of(bh, struct lmv_batch, lbh_super);
4111         child_bh = lmv_batch_get_sub(lbh, tgt);
4112         if (IS_ERR(child_bh))
4113                 RETURN(PTR_ERR(child_bh));
4114
4115         rc = md_batch_add(tgt->ltd_exp, child_bh, item);
4116         RETURN(rc);
4117 }
4118
4119 static const struct obd_ops lmv_obd_ops = {
4120         .o_owner                = THIS_MODULE,
4121         .o_setup                = lmv_setup,
4122         .o_cleanup              = lmv_cleanup,
4123         .o_precleanup           = lmv_precleanup,
4124         .o_process_config       = lmv_process_config,
4125         .o_connect              = lmv_connect,
4126         .o_disconnect           = lmv_disconnect,
4127         .o_statfs               = lmv_statfs,
4128         .o_get_info             = lmv_get_info,
4129         .o_set_info_async       = lmv_set_info_async,
4130         .o_notify               = lmv_notify,
4131         .o_get_uuid             = lmv_get_uuid,
4132         .o_fid_alloc            = lmv_fid_alloc,
4133         .o_iocontrol            = lmv_iocontrol,
4134         .o_quotactl             = lmv_quotactl
4135 };
4136
4137 static const struct md_ops lmv_md_ops = {
4138         .m_get_root             = lmv_get_root,
4139         .m_null_inode           = lmv_null_inode,
4140         .m_close                = lmv_close,
4141         .m_create               = lmv_create,
4142         .m_enqueue              = lmv_enqueue,
4143         .m_getattr              = lmv_getattr,
4144         .m_getxattr             = lmv_getxattr,
4145         .m_getattr_name         = lmv_getattr_name,
4146         .m_intent_lock          = lmv_intent_lock,
4147         .m_link                 = lmv_link,
4148         .m_rename               = lmv_rename,
4149         .m_setattr              = lmv_setattr,
4150         .m_setxattr             = lmv_setxattr,
4151         .m_fsync                = lmv_fsync,
4152         .m_file_resync          = lmv_file_resync,
4153         .m_read_page            = lmv_read_page,
4154         .m_unlink               = lmv_unlink,
4155         .m_init_ea_size         = lmv_init_ea_size,
4156         .m_cancel_unused        = lmv_cancel_unused,
4157         .m_set_lock_data        = lmv_set_lock_data,
4158         .m_lock_match           = lmv_lock_match,
4159         .m_get_lustre_md        = lmv_get_lustre_md,
4160         .m_free_lustre_md       = lmv_free_lustre_md,
4161         .m_merge_attr           = lmv_merge_attr,
4162         .m_set_open_replay_data = lmv_set_open_replay_data,
4163         .m_clear_open_replay_data = lmv_clear_open_replay_data,
4164         .m_intent_getattr_async = lmv_intent_getattr_async,
4165         .m_revalidate_lock      = lmv_revalidate_lock,
4166         .m_get_fid_from_lsm     = lmv_get_fid_from_lsm,
4167         .m_unpackmd             = lmv_unpackmd,
4168         .m_rmfid                = lmv_rmfid,
4169         .m_batch_create         = lmv_batch_create,
4170         .m_batch_add            = lmv_batch_add,
4171         .m_batch_stop           = lmv_batch_stop,
4172         .m_batch_flush          = lmv_batch_flush,
4173 };
4174
4175 static int __init lmv_init(void)
4176 {
4177         return class_register_type(&lmv_obd_ops, &lmv_md_ops, true,
4178                                    LUSTRE_LMV_NAME, NULL);
4179 }
4180
4181 static void __exit lmv_exit(void)
4182 {
4183         class_unregister_type(LUSTRE_LMV_NAME);
4184 }
4185
4186 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
4187 MODULE_DESCRIPTION("Lustre Logical Metadata Volume");
4188 MODULE_VERSION(LUSTRE_VERSION_STRING);
4189 MODULE_LICENSE("GPL");
4190
4191 module_init(lmv_init);
4192 module_exit(lmv_exit);