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  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_LMV
  34
  35 #include <linux/file.h>
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/user_namespace.h>
  39 #include <linux/uidgid.h>
  40 #include <linux/slab.h>
  41 #include <linux/pagemap.h>
  42 #include <linux/mm.h>
  43 #include <linux/math64.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/namei.h>
  46
  47 #include <obd_support.h>
  48 #include <lustre_lib.h>
  49 #include <lustre_net.h>
  50 #include <obd_class.h>
  51 #include <lustre_lmv.h>
  52 #include <lprocfs_status.h>
  53 #include <cl_object.h>
  54 #include <lustre_fid.h>
  55 #include <uapi/linux/lustre/lustre_ioctl.h>
  56 #include <lustre_kernelcomm.h>
  57 #include "lmv_internal.h"
  58
  59 static int lmv_check_connect(struct obd_device *obd);
  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 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 == NULL) ? NULL : obd_get_uuid(tgt->ltd_exp);
 138 }
 139
 140 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
 141                       enum obd_notify_event ev)
 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 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 = obd_fid_fini(tgt->ltd_exp->exp_obd);
 513         if (rc)
 514                 CERROR("Can't finanize fids factory\n");
 515
 516         CDEBUG(D_INFO, "Disconnected from %s(%s) successfully\n",
 517                tgt->ltd_exp->exp_obd->obd_name,
 518                tgt->ltd_exp->exp_obd->obd_uuid.uuid);
 519
 520         obd_register_observer(tgt->ltd_exp->exp_obd, NULL);
 521         rc = obd_disconnect(tgt->ltd_exp);
 522         if (rc) {
 523                 if (tgt->ltd_active) {
 524                         CERROR("Target %s disconnect error %d\n",
 525                                tgt->ltd_uuid.uuid, rc);
 526                 }
 527         }
 528
 529         lmv_activate_target(lmv, tgt, 0);
 530         tgt->ltd_exp = NULL;
 531         RETURN(0);
 532 }
 533
 534 static int lmv_disconnect(struct obd_export *exp)
 535 {
 536         struct obd_device *obd = class_exp2obd(exp);
 537         struct lmv_obd *lmv = &obd->u.lmv;
 538         struct lmv_tgt_desc *tgt;
 539         int rc;
 540
 541         ENTRY;
 542
 543         lmv_foreach_connected_tgt(lmv, tgt)
 544                 lmv_disconnect_mdc(obd, tgt);
 545
 546         if (lmv->lmv_tgts_kobj)
 547                 kobject_put(lmv->lmv_tgts_kobj);
 548
 549         if (!lmv->connected)
 550                 class_export_put(exp);
 551         rc = class_disconnect(exp);
 552         lmv->connected = 0;
 553
 554         RETURN(rc);
 555 }
 556
 557 static int lmv_fid2path(struct obd_export *exp, int len, void *karg,
 558                         void __user *uarg)
 559 {
 560         struct obd_device *obd = class_exp2obd(exp);
 561         struct lmv_obd *lmv = &obd->u.lmv;
 562         struct getinfo_fid2path *gf;
 563         struct lmv_tgt_desc *tgt;
 564         struct getinfo_fid2path *remote_gf = NULL;
 565         struct lu_fid root_fid;
 566         int remote_gf_size = 0;
 567         int rc;
 568
 569         gf = karg;
 570         tgt = lmv_fid2tgt(lmv, &gf->gf_fid);
 571         if (IS_ERR(tgt))
 572                 RETURN(PTR_ERR(tgt));
 573
 574         root_fid = *gf->gf_u.gf_root_fid;
 575         LASSERT(fid_is_sane(&root_fid));
 576
 577 repeat_fid2path:
 578         rc = obd_iocontrol(OBD_IOC_FID2PATH, tgt->ltd_exp, len, gf, uarg);
 579         if (rc != 0 && rc != -EREMOTE)
 580                 GOTO(out_fid2path, rc);
 581
 582         /* If remote_gf != NULL, it means just building the
 583          * path on the remote MDT, copy this path segement to gf */
 584         if (remote_gf != NULL) {
 585                 struct getinfo_fid2path *ori_gf;
 586                 char *ptr;
 587                 int len;
 588
 589                 ori_gf = (struct getinfo_fid2path *)karg;
 590                 if (strlen(ori_gf->gf_u.gf_path) + 1 +
 591                     strlen(gf->gf_u.gf_path) + 1 > ori_gf->gf_pathlen)
 592                         GOTO(out_fid2path, rc = -EOVERFLOW);
 593
 594                 ptr = ori_gf->gf_u.gf_path;
 595
 596                 len = strlen(gf->gf_u.gf_path);
 597                 /* move the current path to the right to release space
 598                  * for closer-to-root part */
 599                 memmove(ptr + len + 1, ptr, strlen(ori_gf->gf_u.gf_path));
 600                 memcpy(ptr, gf->gf_u.gf_path, len);
 601                 ptr[len] = '/';
 602         }
 603
 604         CDEBUG(D_INFO, "%s: get path %s "DFID" rec: %llu ln: %u\n",
 605                tgt->ltd_exp->exp_obd->obd_name,
 606                gf->gf_u.gf_path, PFID(&gf->gf_fid), gf->gf_recno,
 607                gf->gf_linkno);
 608
 609         if (rc == 0)
 610                 GOTO(out_fid2path, rc);
 611
 612         /* sigh, has to go to another MDT to do path building further */
 613         if (remote_gf == NULL) {
 614                 remote_gf_size = sizeof(*remote_gf) + PATH_MAX;
 615                 OBD_ALLOC(remote_gf, remote_gf_size);
 616                 if (remote_gf == NULL)
 617                         GOTO(out_fid2path, rc = -ENOMEM);
 618                 remote_gf->gf_pathlen = PATH_MAX;
 619         }
 620
 621         if (!fid_is_sane(&gf->gf_fid)) {
 622                 CERROR("%s: invalid FID "DFID": rc = %d\n",
 623                        tgt->ltd_exp->exp_obd->obd_name,
 624                        PFID(&gf->gf_fid), -EINVAL);
 625                 GOTO(out_fid2path, rc = -EINVAL);
 626         }
 627
 628         tgt = lmv_fid2tgt(lmv, &gf->gf_fid);
 629         if (IS_ERR(tgt))
 630                 GOTO(out_fid2path, rc = -EINVAL);
 631
 632         remote_gf->gf_fid = gf->gf_fid;
 633         remote_gf->gf_recno = -1;
 634         remote_gf->gf_linkno = -1;
 635         memset(remote_gf->gf_u.gf_path, 0, remote_gf->gf_pathlen);
 636         *remote_gf->gf_u.gf_root_fid = root_fid;
 637         gf = remote_gf;
 638         goto repeat_fid2path;
 639
 640 out_fid2path:
 641         if (remote_gf != NULL)
 642                 OBD_FREE(remote_gf, remote_gf_size);
 643         RETURN(rc);
 644 }
 645
 646 static int lmv_hsm_req_count(struct lmv_obd *lmv,
 647                              const struct hsm_user_request *hur,
 648                              const struct lmv_tgt_desc *tgt_mds)
 649 {
 650         struct lmv_tgt_desc *curr_tgt;
 651         __u32 i;
 652         int nr = 0;
 653
 654         /* count how many requests must be sent to the given target */
 655         for (i = 0; i < hur->hur_request.hr_itemcount; i++) {
 656                 curr_tgt = lmv_fid2tgt(lmv, &hur->hur_user_item[i].hui_fid);
 657                 if (IS_ERR(curr_tgt))
 658                         RETURN(PTR_ERR(curr_tgt));
 659                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid))
 660                         nr++;
 661         }
 662         return nr;
 663 }
 664
 665 static int lmv_hsm_req_build(struct lmv_obd *lmv,
 666                               struct hsm_user_request *hur_in,
 667                               const struct lmv_tgt_desc *tgt_mds,
 668                               struct hsm_user_request *hur_out)
 669 {
 670         __u32 i, nr_out;
 671         struct lmv_tgt_desc *curr_tgt;
 672
 673         /* build the hsm_user_request for the given target */
 674         hur_out->hur_request = hur_in->hur_request;
 675         nr_out = 0;
 676         for (i = 0; i < hur_in->hur_request.hr_itemcount; i++) {
 677                 curr_tgt = lmv_fid2tgt(lmv, &hur_in->hur_user_item[i].hui_fid);
 678                 if (IS_ERR(curr_tgt))
 679                         RETURN(PTR_ERR(curr_tgt));
 680                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid)) {
 681                         hur_out->hur_user_item[nr_out] =
 682                                                 hur_in->hur_user_item[i];
 683                         nr_out++;
 684                 }
 685         }
 686         hur_out->hur_request.hr_itemcount = nr_out;
 687         memcpy(hur_data(hur_out), hur_data(hur_in),
 688                hur_in->hur_request.hr_data_len);
 689
 690         RETURN(0);
 691 }
 692
 693 static int lmv_hsm_ct_unregister(struct obd_device *obd, unsigned int cmd,
 694                                  int len, struct lustre_kernelcomm *lk,
 695                                  void __user *uarg)
 696 {
 697         struct lmv_obd *lmv = &obd->u.lmv;
 698         struct lu_tgt_desc *tgt;
 699         int rc;
 700
 701         ENTRY;
 702
 703         /* unregister request (call from llapi_hsm_copytool_fini) */
 704         lmv_foreach_connected_tgt(lmv, tgt)
 705                 /* best effort: try to clean as much as possible
 706                  * (continue on error) */
 707                 obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
 708
 709         /* Whatever the result, remove copytool from kuc groups.
 710          * Unreached coordinators will get EPIPE on next requests
 711          * and will unregister automatically.
 712          */
 713         rc = libcfs_kkuc_group_rem(&obd->obd_uuid, lk->lk_uid, lk->lk_group);
 714
 715         RETURN(rc);
 716 }
 717
 718 static int lmv_hsm_ct_register(struct obd_device *obd, unsigned int cmd,
 719                                int len, struct lustre_kernelcomm *lk,
 720                                void __user *uarg)
 721 {
 722         struct lmv_obd *lmv = &obd->u.lmv;
 723         struct file *filp;
 724         bool any_set = false;
 725         struct kkuc_ct_data *kcd;
 726         size_t kcd_size;
 727         struct lu_tgt_desc *tgt;
 728         __u32 i;
 729         int err;
 730         int rc = 0;
 731
 732         ENTRY;
 733
 734         filp = fget(lk->lk_wfd);
 735         if (!filp)
 736                 RETURN(-EBADF);
 737
 738         if (lk->lk_flags & LK_FLG_DATANR)
 739                 kcd_size = offsetof(struct kkuc_ct_data,
 740                                     kcd_archives[lk->lk_data_count]);
 741         else
 742                 kcd_size = sizeof(*kcd);
 743
 744         OBD_ALLOC(kcd, kcd_size);
 745         if (kcd == NULL)
 746                 GOTO(err_fput, rc = -ENOMEM);
 747
 748         kcd->kcd_nr_archives = lk->lk_data_count;
 749         if (lk->lk_flags & LK_FLG_DATANR) {
 750                 kcd->kcd_magic = KKUC_CT_DATA_ARRAY_MAGIC;
 751                 if (lk->lk_data_count > 0)
 752                         memcpy(kcd->kcd_archives, lk->lk_data,
 753                                sizeof(*kcd->kcd_archives) * lk->lk_data_count);
 754         } else {
 755                 kcd->kcd_magic = KKUC_CT_DATA_BITMAP_MAGIC;
 756         }
 757
 758         rc = libcfs_kkuc_group_add(filp, &obd->obd_uuid, lk->lk_uid,
 759                                    lk->lk_group, kcd, kcd_size);
 760         OBD_FREE(kcd, kcd_size);
 761         if (rc)
 762                 GOTO(err_fput, rc);
 763
 764         /* All or nothing: try to register to all MDS.
 765          * In case of failure, unregister from previous MDS,
 766          * except if it because of inactive target. */
 767         lmv_foreach_connected_tgt(lmv, tgt) {
 768                 err = obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
 769                 if (err) {
 770                         if (tgt->ltd_active) {
 771                                 /* permanent error */
 772                                 CERROR("%s: iocontrol MDC %s on MDT"
 773                                        " idx %d cmd %x: err = %d\n",
 774                                        lmv2obd_dev(lmv)->obd_name,
 775                                        tgt->ltd_uuid.uuid, tgt->ltd_index, cmd,
 776                                        err);
 777                                 rc = err;
 778                                 lk->lk_flags |= LK_FLG_STOP;
 779                                 i = tgt->ltd_index;
 780                                 /* unregister from previous MDS */
 781                                 lmv_foreach_connected_tgt(lmv, tgt) {
 782                                         if (tgt->ltd_index >= i)
 783                                                 break;
 784
 785                                         obd_iocontrol(cmd, tgt->ltd_exp, len,
 786                                                       lk, uarg);
 787                                 }
 788                                 GOTO(err_kkuc_rem, rc);
 789                         }
 790                         /* else: transient error.
 791                          * kuc will register to the missing MDT
 792                          * when it is back */
 793                 } else {
 794                         any_set = true;
 795                 }
 796         }
 797
 798         if (!any_set)
 799                 /* no registration done: return error */
 800                 GOTO(err_kkuc_rem, rc = -ENOTCONN);
 801
 802         RETURN(0);
 803
 804 err_kkuc_rem:
 805         libcfs_kkuc_group_rem(&obd->obd_uuid, lk->lk_uid, lk->lk_group);
 806
 807 err_fput:
 808         fput(filp);
 809         return rc;
 810 }
 811
 812 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
 813                          int len, void *karg, void __user *uarg)
 814 {
 815         struct obd_device *obd = class_exp2obd(exp);
 816         struct lmv_obd *lmv = &obd->u.lmv;
 817         struct lu_tgt_desc *tgt = NULL;
 818         int set = 0;
 819         __u32 count = lmv->lmv_mdt_count;
 820         int rc = 0;
 821
 822         ENTRY;
 823
 824         if (count == 0)
 825                 RETURN(-ENOTTY);
 826
 827         switch (cmd) {
 828         case IOC_OBD_STATFS: {
 829                 struct obd_ioctl_data *data = karg;
 830                 struct obd_device *mdc_obd;
 831                 struct obd_statfs stat_buf = {0};
 832                 __u32 index;
 833
 834                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
 835
 836                 if (index >= lmv->lmv_mdt_descs.ltd_tgts_size)
 837                         RETURN(-ENODEV);
 838
 839                 tgt = lmv_tgt(lmv, index);
 840                 if (!tgt || !tgt->ltd_active)
 841                         RETURN(-ENODATA);
 842
 843                 mdc_obd = class_exp2obd(tgt->ltd_exp);
 844                 if (!mdc_obd)
 845                         RETURN(-EINVAL);
 846
 847                 /* copy UUID */
 848                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(mdc_obd),
 849                                  min((int) data->ioc_plen2,
 850                                      (int) sizeof(struct obd_uuid))))
 851                         RETURN(-EFAULT);
 852
 853                 rc = obd_statfs(NULL, tgt->ltd_exp, &stat_buf,
 854                                 ktime_get_seconds() - OBD_STATFS_CACHE_SECONDS,
 855                                 0);
 856                 if (rc)
 857                         RETURN(rc);
 858                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
 859                                  min((int) data->ioc_plen1,
 860                                      (int) sizeof(stat_buf))))
 861                         RETURN(-EFAULT);
 862                 break;
 863         }
 864         case OBD_IOC_QUOTACTL: {
 865                 struct if_quotactl *qctl = karg;
 866                 struct obd_quotactl *oqctl;
 867
 868                 if (qctl->qc_valid == QC_MDTIDX) {
 869                         tgt = lmv_tgt(lmv, qctl->qc_idx);
 870                 } else if (qctl->qc_valid == QC_UUID) {
 871                         lmv_foreach_tgt(lmv, tgt) {
 872                                 if (!obd_uuid_equals(&tgt->ltd_uuid,
 873                                                      &qctl->obd_uuid))
 874                                         continue;
 875
 876                                 if (!tgt->ltd_exp)
 877                                         RETURN(-EINVAL);
 878
 879                                 break;
 880                         }
 881                 } else {
 882                         RETURN(-EINVAL);
 883                 }
 884
 885                 if (!tgt || !tgt->ltd_exp)
 886                         RETURN(-EINVAL);
 887
 888                 OBD_ALLOC_PTR(oqctl);
 889                 if (!oqctl)
 890                         RETURN(-ENOMEM);
 891
 892                 QCTL_COPY(oqctl, qctl);
 893                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
 894                 if (rc == 0) {
 895                         QCTL_COPY(qctl, oqctl);
 896                         qctl->qc_valid = QC_MDTIDX;
 897                         qctl->obd_uuid = tgt->ltd_uuid;
 898                 }
 899                 OBD_FREE_PTR(oqctl);
 900                 break;
 901         }
 902         case LL_IOC_GET_CONNECT_FLAGS: {
 903                 tgt = lmv_tgt(lmv, 0);
 904                 rc = -ENODATA;
 905                 if (tgt && tgt->ltd_exp)
 906                         rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
 907                 break;
 908         }
 909         case LL_IOC_FID2MDTIDX: {
 910                 struct lu_fid *fid = karg;
 911                 int             mdt_index;
 912
 913                 rc = lmv_fld_lookup(lmv, fid, &mdt_index);
 914                 if (rc != 0)
 915                         RETURN(rc);
 916
 917                 /* Note: this is from llite(see ll_dir_ioctl()), @uarg does not
 918                  * point to user space memory for FID2MDTIDX. */
 919                 *(__u32 *)uarg = mdt_index;
 920                 break;
 921         }
 922         case OBD_IOC_FID2PATH: {
 923                 rc = lmv_fid2path(exp, len, karg, uarg);
 924                 break;
 925         }
 926         case LL_IOC_HSM_STATE_GET:
 927         case LL_IOC_HSM_STATE_SET:
 928         case LL_IOC_HSM_ACTION: {
 929                 struct md_op_data *op_data = karg;
 930
 931                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
 932                 if (IS_ERR(tgt))
 933                         RETURN(PTR_ERR(tgt));
 934
 935                 if (tgt->ltd_exp == NULL)
 936                         RETURN(-EINVAL);
 937
 938                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
 939                 break;
 940         }
 941         case LL_IOC_HSM_PROGRESS: {
 942                 const struct hsm_progress_kernel *hpk = karg;
 943
 944                 tgt = lmv_fid2tgt(lmv, &hpk->hpk_fid);
 945                 if (IS_ERR(tgt))
 946                         RETURN(PTR_ERR(tgt));
 947                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
 948                 break;
 949         }
 950         case LL_IOC_HSM_REQUEST: {
 951                 struct hsm_user_request *hur = karg;
 952                 unsigned int reqcount = hur->hur_request.hr_itemcount;
 953
 954                 if (reqcount == 0)
 955                         RETURN(0);
 956
 957                 /* if the request is about a single fid
 958                  * or if there is a single MDS, no need to split
 959                  * the request. */
 960                 if (reqcount == 1 || count == 1) {
 961                         tgt = lmv_fid2tgt(lmv, &hur->hur_user_item[0].hui_fid);
 962                         if (IS_ERR(tgt))
 963                                 RETURN(PTR_ERR(tgt));
 964                         rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
 965                 } else {
 966                         /* split fid list to their respective MDS */
 967                         lmv_foreach_connected_tgt(lmv, tgt) {
 968                                 int nr, rc1;
 969                                 size_t reqlen;
 970                                 struct hsm_user_request *req;
 971
 972                                 nr = lmv_hsm_req_count(lmv, hur, tgt);
 973                                 if (nr < 0)
 974                                         RETURN(nr);
 975                                 if (nr == 0) /* nothing for this MDS */
 976                                         continue;
 977
 978                                 /* build a request with fids for this MDS */
 979                                 reqlen = offsetof(typeof(*hur),
 980                                                   hur_user_item[nr])
 981                                                 + hur->hur_request.hr_data_len;
 982                                 OBD_ALLOC_LARGE(req, reqlen);
 983                                 if (req == NULL)
 984                                         RETURN(-ENOMEM);
 985                                 rc1 = lmv_hsm_req_build(lmv, hur, tgt, req);
 986                                 if (rc1 < 0)
 987                                         GOTO(hsm_req_err, rc1);
 988                                 rc1 = obd_iocontrol(cmd, tgt->ltd_exp, reqlen,
 989                                                     req, uarg);
 990 hsm_req_err:
 991                                 if (rc1 != 0 && rc == 0)
 992                                         rc = rc1;
 993                                 OBD_FREE_LARGE(req, reqlen);
 994                         }
 995                 }
 996                 break;
 997         }
 998         case LL_IOC_LOV_SWAP_LAYOUTS: {
 999                 struct md_op_data *op_data = karg;
1000                 struct lmv_tgt_desc *tgt1, *tgt2;
1001
1002                 tgt1 = lmv_fid2tgt(lmv, &op_data->op_fid1);
1003                 if (IS_ERR(tgt1))
1004                         RETURN(PTR_ERR(tgt1));
1005
1006                 tgt2 = lmv_fid2tgt(lmv, &op_data->op_fid2);
1007                 if (IS_ERR(tgt2))
1008                         RETURN(PTR_ERR(tgt2));
1009
1010                 if ((tgt1->ltd_exp == NULL) || (tgt2->ltd_exp == NULL))
1011                         RETURN(-EINVAL);
1012
1013                 /* only files on same MDT can have their layouts swapped */
1014                 if (tgt1->ltd_index != tgt2->ltd_index)
1015                         RETURN(-EPERM);
1016
1017                 rc = obd_iocontrol(cmd, tgt1->ltd_exp, len, karg, uarg);
1018                 break;
1019         }
1020         case LL_IOC_HSM_CT_START: {
1021                 struct lustre_kernelcomm *lk = karg;
1022                 if (lk->lk_flags & LK_FLG_STOP)
1023                         rc = lmv_hsm_ct_unregister(obd, cmd, len, lk, uarg);
1024                 else
1025                         rc = lmv_hsm_ct_register(obd, cmd, len, lk, uarg);
1026                 break;
1027         }
1028         default:
1029                 lmv_foreach_connected_tgt(lmv, tgt) {
1030                         struct obd_device *mdc_obd;
1031                         int err;
1032
1033                         /* ll_umount_begin() sets force flag but for lmv, not
1034                          * mdc. Let's pass it through */
1035                         mdc_obd = class_exp2obd(tgt->ltd_exp);
1036                         mdc_obd->obd_force = obd->obd_force;
1037                         err = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1038                         if (err) {
1039                                 if (tgt->ltd_active) {
1040                                         CERROR("error: iocontrol MDC %s on MDT"
1041                                                " idx %d cmd %x: err = %d\n",
1042                                                tgt->ltd_uuid.uuid,
1043                                                tgt->ltd_index, cmd, err);
1044                                         if (!rc)
1045                                                 rc = err;
1046                                 }
1047                         } else
1048                                 set = 1;
1049                 }
1050                 if (!set && !rc)
1051                         rc = -EIO;
1052         }
1053         RETURN(rc);
1054 }
1055
1056 int lmv_fid_alloc(const struct lu_env *env, struct obd_export *exp,
1057                   struct lu_fid *fid, struct md_op_data *op_data)
1058 {
1059         struct obd_device *obd = class_exp2obd(exp);
1060         struct lmv_obd *lmv = &obd->u.lmv;
1061         struct lmv_tgt_desc *tgt;
1062         int rc;
1063
1064         ENTRY;
1065
1066         LASSERT(op_data);
1067         LASSERT(fid);
1068
1069         tgt = lmv_tgt(lmv, op_data->op_mds);
1070         if (!tgt)
1071                 RETURN(-ENODEV);
1072
1073         if (!tgt->ltd_active || !tgt->ltd_exp)
1074                 RETURN(-ENODEV);
1075
1076         /*
1077          * New seq alloc and FLD setup should be atomic. Otherwise we may find
1078          * on server that seq in new allocated fid is not yet known.
1079          */
1080         mutex_lock(&tgt->ltd_fid_mutex);
1081         rc = obd_fid_alloc(NULL, tgt->ltd_exp, fid, NULL);
1082         mutex_unlock(&tgt->ltd_fid_mutex);
1083         if (rc > 0) {
1084                 LASSERT(fid_is_sane(fid));
1085                 rc = 0;
1086         }
1087
1088         RETURN(rc);
1089 }
1090
1091 static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
1092 {
1093         struct lmv_obd *lmv = &obd->u.lmv;
1094         struct lmv_desc *desc;
1095         struct lnet_process_id lnet_id;
1096         int i = 0;
1097         int rc;
1098
1099         ENTRY;
1100
1101         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1102                 CERROR("LMV setup requires a descriptor\n");
1103                 RETURN(-EINVAL);
1104         }
1105
1106         desc = (struct lmv_desc *)lustre_cfg_buf(lcfg, 1);
1107         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1108                 CERROR("Lmv descriptor size wrong: %d > %d\n",
1109                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1110                 RETURN(-EINVAL);
1111         }
1112
1113         obd_str2uuid(&lmv->lmv_mdt_descs.ltd_lmv_desc.ld_uuid,
1114                      desc->ld_uuid.uuid);
1115         lmv->lmv_mdt_descs.ltd_lmv_desc.ld_tgt_count = 0;
1116         lmv->lmv_mdt_descs.ltd_lmv_desc.ld_active_tgt_count = 0;
1117         lmv->lmv_mdt_descs.ltd_lmv_desc.ld_qos_maxage =
1118                 LMV_DESC_QOS_MAXAGE_DEFAULT;
1119         lmv->max_def_easize = 0;
1120         lmv->max_easize = 0;
1121
1122         spin_lock_init(&lmv->lmv_lock);
1123
1124         /*
1125          * initialize rr_index to lower 32bit of netid, so that client
1126          * can distribute subdirs evenly from the beginning.
1127          */
1128         while (LNetGetId(i++, &lnet_id) != -ENOENT) {
1129                 if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND) {
1130                         lmv->lmv_qos_rr_index = (u32)lnet_id.nid;
1131                         break;
1132                 }
1133         }
1134
1135         rc = lmv_tunables_init(obd);
1136         if (rc)
1137                 CWARN("%s: error adding LMV sysfs/debugfs files: rc = %d\n",
1138                       obd->obd_name, rc);
1139
1140         rc = fld_client_init(&lmv->lmv_fld, obd->obd_name,
1141                              LUSTRE_CLI_FLD_HASH_DHT);
1142         if (rc)
1143                 CERROR("Can't init FLD, err %d\n", rc);
1144
1145         rc = lu_tgt_descs_init(&lmv->lmv_mdt_descs, true);
1146         if (rc)
1147                 CWARN("%s: error initialize target table: rc = %d\n",
1148                       obd->obd_name, rc);
1149
1150         RETURN(rc);
1151 }
1152
1153 static int lmv_cleanup(struct obd_device *obd)
1154 {
1155         struct lmv_obd *lmv = &obd->u.lmv;
1156         struct lu_tgt_desc *tgt;
1157         struct lu_tgt_desc *tmp;
1158
1159         ENTRY;
1160
1161         fld_client_fini(&lmv->lmv_fld);
1162         lmv_foreach_tgt_safe(lmv, tgt, tmp)
1163                 lmv_del_target(lmv, tgt);
1164         lu_tgt_descs_fini(&lmv->lmv_mdt_descs);
1165
1166         RETURN(0);
1167 }
1168
1169 static int lmv_process_config(struct obd_device *obd, size_t len, void *buf)
1170 {
1171         struct lustre_cfg       *lcfg = buf;
1172         struct obd_uuid         obd_uuid;
1173         int                     gen;
1174         __u32                   index;
1175         int                     rc;
1176         ENTRY;
1177
1178         switch (lcfg->lcfg_command) {
1179         case LCFG_ADD_MDC:
1180                 /* modify_mdc_tgts add 0:lustre-clilmv  1:lustre-MDT0000_UUID
1181                  * 2:0  3:1  4:lustre-MDT0000-mdc_UUID */
1182                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
1183                         GOTO(out, rc = -EINVAL);
1184
1185                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
1186
1187                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%u", &index) != 1)
1188                         GOTO(out, rc = -EINVAL);
1189                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", &gen) != 1)
1190                         GOTO(out, rc = -EINVAL);
1191                 rc = lmv_add_target(obd, &obd_uuid, index, gen);
1192                 GOTO(out, rc);
1193         default:
1194                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1195                 GOTO(out, rc = -EINVAL);
1196         }
1197 out:
1198         RETURN(rc);
1199 }
1200
1201 static int lmv_select_statfs_mdt(struct lmv_obd *lmv, __u32 flags)
1202 {
1203         int i;
1204
1205         if (flags & OBD_STATFS_FOR_MDT0)
1206                 return 0;
1207
1208         if (lmv->lmv_statfs_start || lmv->lmv_mdt_count == 1)
1209                 return lmv->lmv_statfs_start;
1210
1211         /* choose initial MDT for this client */
1212         for (i = 0;; i++) {
1213                 struct lnet_process_id lnet_id;
1214                 if (LNetGetId(i, &lnet_id) == -ENOENT)
1215                         break;
1216
1217                 if (LNET_NETTYP(LNET_NIDNET(lnet_id.nid)) != LOLND) {
1218                         /* We dont need a full 64-bit modulus, just enough
1219                          * to distribute the requests across MDTs evenly.
1220                          */
1221                         lmv->lmv_statfs_start = (u32)lnet_id.nid %
1222                                                 lmv->lmv_mdt_count;
1223                         break;
1224                 }
1225         }
1226
1227         return lmv->lmv_statfs_start;
1228 }
1229
1230 static int lmv_statfs(const struct lu_env *env, struct obd_export *exp,
1231                       struct obd_statfs *osfs, time64_t max_age, __u32 flags)
1232 {
1233         struct obd_device *obd = class_exp2obd(exp);
1234         struct lmv_obd *lmv = &obd->u.lmv;
1235         struct obd_statfs *temp;
1236         struct lu_tgt_desc *tgt;
1237         __u32 i;
1238         __u32 idx;
1239         int rc = 0;
1240
1241         ENTRY;
1242
1243         OBD_ALLOC(temp, sizeof(*temp));
1244         if (temp == NULL)
1245                 RETURN(-ENOMEM);
1246
1247         /* distribute statfs among MDTs */
1248         idx = lmv_select_statfs_mdt(lmv, flags);
1249
1250         for (i = 0; i < lmv->lmv_mdt_descs.ltd_tgts_size; i++, idx++) {
1251                 idx = idx % lmv->lmv_mdt_descs.ltd_tgts_size;
1252                 tgt = lmv_tgt(lmv, idx);
1253                 if (!tgt || !tgt->ltd_exp)
1254                         continue;
1255
1256                 rc = obd_statfs(env, tgt->ltd_exp, temp, max_age, flags);
1257                 if (rc) {
1258                         CERROR("%s: can't stat MDS #%d: rc = %d\n",
1259                                tgt->ltd_exp->exp_obd->obd_name, i, rc);
1260                         GOTO(out_free_temp, rc);
1261                 }
1262
1263                 if (temp->os_state & OS_STATE_SUM ||
1264                     flags == OBD_STATFS_FOR_MDT0) {
1265                         /* reset to the last aggregated values
1266                          * and don't sum with non-aggrated data */
1267                         /* If the statfs is from mount, it needs to retrieve
1268                          * necessary information from MDT0. i.e. mount does
1269                          * not need the merged osfs from all of MDT. Also
1270                          * clients can be mounted as long as MDT0 is in
1271                          * service */
1272                         *osfs = *temp;
1273                         break;
1274                 }
1275
1276                 if (i == 0) {
1277                         *osfs = *temp;
1278                 } else {
1279                         osfs->os_bavail += temp->os_bavail;
1280                         osfs->os_blocks += temp->os_blocks;
1281                         osfs->os_ffree += temp->os_ffree;
1282                         osfs->os_files += temp->os_files;
1283                         osfs->os_granted += temp->os_granted;
1284                 }
1285         }
1286
1287         EXIT;
1288 out_free_temp:
1289         OBD_FREE(temp, sizeof(*temp));
1290         return rc;
1291 }
1292
1293 static int lmv_statfs_update(void *cookie, int rc)
1294 {
1295         struct obd_info *oinfo = cookie;
1296         struct obd_device *obd = oinfo->oi_obd;
1297         struct lmv_obd *lmv = &obd->u.lmv;
1298         struct lmv_tgt_desc *tgt = oinfo->oi_tgt;
1299         struct obd_statfs *osfs = oinfo->oi_osfs;
1300
1301         /*
1302          * NB: don't deactivate TGT upon error, because we may not trigger async
1303          * statfs any longer, then there is no chance to activate TGT.
1304          */
1305         if (!rc) {
1306                 spin_lock(&lmv->lmv_lock);
1307                 tgt->ltd_statfs = *osfs;
1308                 tgt->ltd_statfs_age = ktime_get_seconds();
1309                 spin_unlock(&lmv->lmv_lock);
1310                 lmv->lmv_qos.lq_dirty = 1;
1311         }
1312
1313         return rc;
1314 }
1315
1316 /* update tgt statfs async if it's ld_qos_maxage old */
1317 int lmv_statfs_check_update(struct obd_device *obd, struct lmv_tgt_desc *tgt)
1318 {
1319         struct obd_info oinfo = {
1320                 .oi_obd = obd,
1321                 .oi_tgt = tgt,
1322                 .oi_cb_up = lmv_statfs_update,
1323         };
1324         int rc;
1325
1326         if (ktime_get_seconds() - tgt->ltd_statfs_age <
1327             obd->u.lmv.lmv_mdt_descs.ltd_lmv_desc.ld_qos_maxage)
1328                 return 0;
1329
1330         rc = obd_statfs_async(tgt->ltd_exp, &oinfo, 0, NULL);
1331
1332         return rc;
1333 }
1334
1335 static int lmv_get_root(struct obd_export *exp, const char *fileset,
1336                         struct lu_fid *fid)
1337 {
1338         struct obd_device *obd = exp->exp_obd;
1339         struct lmv_obd *lmv = &obd->u.lmv;
1340         struct lu_tgt_desc *tgt = lmv_tgt(lmv, 0);
1341         int rc;
1342
1343         ENTRY;
1344
1345         if (!tgt)
1346                 RETURN(-ENODEV);
1347
1348         rc = md_get_root(tgt->ltd_exp, fileset, fid);
1349         RETURN(rc);
1350 }
1351
1352 static int lmv_getxattr(struct obd_export *exp, const struct lu_fid *fid,
1353                         u64 obd_md_valid, const char *name, size_t buf_size,
1354                         struct ptlrpc_request **req)
1355 {
1356         struct obd_device *obd = exp->exp_obd;
1357         struct lmv_obd *lmv = &obd->u.lmv;
1358         struct lmv_tgt_desc *tgt;
1359         int rc;
1360
1361         ENTRY;
1362
1363         tgt = lmv_fid2tgt(lmv, fid);
1364         if (IS_ERR(tgt))
1365                 RETURN(PTR_ERR(tgt));
1366
1367         rc = md_getxattr(tgt->ltd_exp, fid, obd_md_valid, name, buf_size, req);
1368
1369         RETURN(rc);
1370 }
1371
1372 static int lmv_setxattr(struct obd_export *exp, const struct lu_fid *fid,
1373                         u64 obd_md_valid, const char *name,
1374                         const void *value, size_t value_size,
1375                         unsigned int xattr_flags, u32 suppgid,
1376                         struct ptlrpc_request **req)
1377 {
1378         struct obd_device *obd = exp->exp_obd;
1379         struct lmv_obd *lmv = &obd->u.lmv;
1380         struct lmv_tgt_desc *tgt;
1381         int rc;
1382
1383         ENTRY;
1384
1385         tgt = lmv_fid2tgt(lmv, fid);
1386         if (IS_ERR(tgt))
1387                 RETURN(PTR_ERR(tgt));
1388
1389         rc = md_setxattr(tgt->ltd_exp, fid, obd_md_valid, name,
1390                          value, value_size, xattr_flags, suppgid, req);
1391
1392         RETURN(rc);
1393 }
1394
1395 static int lmv_getattr(struct obd_export *exp, struct md_op_data *op_data,
1396                        struct ptlrpc_request **request)
1397 {
1398         struct obd_device *obd = exp->exp_obd;
1399         struct lmv_obd *lmv = &obd->u.lmv;
1400         struct lmv_tgt_desc *tgt;
1401         int rc;
1402
1403         ENTRY;
1404
1405         tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
1406         if (IS_ERR(tgt))
1407                 RETURN(PTR_ERR(tgt));
1408
1409         if (op_data->op_flags & MF_GET_MDT_IDX) {
1410                 op_data->op_mds = tgt->ltd_index;
1411                 RETURN(0);
1412         }
1413
1414         rc = md_getattr(tgt->ltd_exp, op_data, request);
1415
1416         RETURN(rc);
1417 }
1418
1419 static int lmv_null_inode(struct obd_export *exp, const struct lu_fid *fid)
1420 {
1421         struct obd_device *obd = exp->exp_obd;
1422         struct lmv_obd *lmv = &obd->u.lmv;
1423         struct lu_tgt_desc *tgt;
1424
1425         ENTRY;
1426
1427         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1428
1429         /*
1430          * With DNE every object can have two locks in different namespaces:
1431          * lookup lock in space of MDT storing direntry and update/open lock in
1432          * space of MDT storing inode.
1433          */
1434         lmv_foreach_connected_tgt(lmv, tgt)
1435                 md_null_inode(tgt->ltd_exp, fid);
1436
1437         RETURN(0);
1438 }
1439
1440 static int lmv_close(struct obd_export *exp, struct md_op_data *op_data,
1441                      struct md_open_data *mod, struct ptlrpc_request **request)
1442 {
1443         struct obd_device *obd = exp->exp_obd;
1444         struct lmv_obd *lmv = &obd->u.lmv;
1445         struct lmv_tgt_desc *tgt;
1446         int rc;
1447
1448         ENTRY;
1449
1450         tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
1451         if (IS_ERR(tgt))
1452                 RETURN(PTR_ERR(tgt));
1453
1454         CDEBUG(D_INODE, "CLOSE "DFID"\n", PFID(&op_data->op_fid1));
1455         rc = md_close(tgt->ltd_exp, op_data, mod, request);
1456         RETURN(rc);
1457 }
1458
1459 static struct lu_tgt_desc *lmv_locate_tgt_qos(struct lmv_obd *lmv, __u32 *mdt)
1460 {
1461         struct lu_tgt_desc *tgt;
1462         __u64 total_weight = 0;
1463         __u64 cur_weight = 0;
1464         __u64 rand;
1465         int rc;
1466
1467         ENTRY;
1468
1469         if (!ltd_qos_is_usable(&lmv->lmv_mdt_descs))
1470                 RETURN(ERR_PTR(-EAGAIN));
1471
1472         down_write(&lmv->lmv_qos.lq_rw_sem);
1473
1474         if (!ltd_qos_is_usable(&lmv->lmv_mdt_descs))
1475                 GOTO(unlock, tgt = ERR_PTR(-EAGAIN));
1476
1477         rc = ltd_qos_penalties_calc(&lmv->lmv_mdt_descs);
1478         if (rc)
1479                 GOTO(unlock, tgt = ERR_PTR(rc));
1480
1481         lmv_foreach_tgt(lmv, tgt) {
1482                 tgt->ltd_qos.ltq_usable = 0;
1483                 if (!tgt->ltd_exp || !tgt->ltd_active)
1484                         continue;
1485
1486                 tgt->ltd_qos.ltq_usable = 1;
1487                 lu_tgt_qos_weight_calc(tgt);
1488                 total_weight += tgt->ltd_qos.ltq_weight;
1489         }
1490
1491         rand = lu_prandom_u64_max(total_weight);
1492
1493         lmv_foreach_connected_tgt(lmv, tgt) {
1494                 if (!tgt->ltd_qos.ltq_usable)
1495                         continue;
1496
1497                 cur_weight += tgt->ltd_qos.ltq_weight;
1498                 if (cur_weight < rand)
1499                         continue;
1500
1501                 *mdt = tgt->ltd_index;
1502                 ltd_qos_update(&lmv->lmv_mdt_descs, tgt, &total_weight);
1503                 GOTO(unlock, rc = 0);
1504         }
1505
1506         /* no proper target found */
1507         GOTO(unlock, tgt = ERR_PTR(-EAGAIN));
1508 unlock:
1509         up_write(&lmv->lmv_qos.lq_rw_sem);
1510
1511         return tgt;
1512 }
1513
1514 static struct lu_tgt_desc *lmv_locate_tgt_rr(struct lmv_obd *lmv, __u32 *mdt)
1515 {
1516         struct lu_tgt_desc *tgt;
1517         int i;
1518         int index;
1519
1520         ENTRY;
1521
1522         spin_lock(&lmv->lmv_qos.lq_rr.lqr_alloc);
1523         for (i = 0; i < lmv->lmv_mdt_descs.ltd_tgts_size; i++) {
1524                 index = (i + lmv->lmv_qos_rr_index) %
1525                         lmv->lmv_mdt_descs.ltd_tgts_size;
1526                 tgt = lmv_tgt(lmv, index);
1527                 if (!tgt || !tgt->ltd_exp || !tgt->ltd_active)
1528                         continue;
1529
1530                 *mdt = tgt->ltd_index;
1531                 lmv->lmv_qos_rr_index = (*mdt + 1) %
1532                                         lmv->lmv_mdt_descs.ltd_tgts_size;
1533                 spin_unlock(&lmv->lmv_qos.lq_rr.lqr_alloc);
1534
1535                 RETURN(tgt);
1536         }
1537         spin_unlock(&lmv->lmv_qos.lq_rr.lqr_alloc);
1538
1539         RETURN(ERR_PTR(-ENODEV));
1540 }
1541
1542 static struct lmv_tgt_desc *
1543 lmv_locate_tgt_by_name(struct lmv_obd *lmv, struct lmv_stripe_md *lsm,
1544                        const char *name, int namelen, struct lu_fid *fid,
1545                        __u32 *mds, bool new_layout)
1546 {
1547         struct lmv_tgt_desc *tgt;
1548         const struct lmv_oinfo *oinfo;
1549
1550         if (!lmv_dir_striped(lsm) || !namelen) {
1551                 tgt = lmv_fid2tgt(lmv, fid);
1552                 if (IS_ERR(tgt))
1553                         return tgt;
1554
1555                 *mds = tgt->ltd_index;
1556                 return tgt;
1557         }
1558
1559         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_NAME_HASH)) {
1560                 if (cfs_fail_val >= lsm->lsm_md_stripe_count)
1561                         return ERR_PTR(-EBADF);
1562                 oinfo = &lsm->lsm_md_oinfo[cfs_fail_val];
1563         } else {
1564                 oinfo = lsm_name_to_stripe_info(lsm, name, namelen, new_layout);
1565                 if (IS_ERR(oinfo))
1566                         return ERR_CAST(oinfo);
1567         }
1568
1569         *fid = oinfo->lmo_fid;
1570         *mds = oinfo->lmo_mds;
1571         tgt = lmv_tgt(lmv, oinfo->lmo_mds);
1572
1573         CDEBUG(D_INODE, "locate MDT %u parent "DFID"\n", *mds, PFID(fid));
1574
1575         return tgt ? tgt : ERR_PTR(-ENODEV);
1576 }
1577
1578 /**
1579  * Locate MDT of op_data->op_fid1
1580  *
1581  * For striped directory, it will locate the stripe by name hash, if hash_type
1582  * is unknown, it will return the stripe specified by 'op_data->op_stripe_index'
1583  * which is set outside, and if dir is migrating, 'op_data->op_new_layout'
1584  * indicates whether old or new layout is used to locate.
1585  *
1586  * For plain direcotry, it just locate the MDT of op_data->op_fid1.
1587  *
1588  * \param[in] lmv       LMV device
1589  * \param[in] op_data   client MD stack parameters, name, namelen
1590  *                      mds_num etc.
1591  *
1592  * retval               pointer to the lmv_tgt_desc if succeed.
1593  *                      ERR_PTR(errno) if failed.
1594  */
1595 struct lmv_tgt_desc *
1596 lmv_locate_tgt(struct lmv_obd *lmv, struct md_op_data *op_data)
1597 {
1598         struct lmv_stripe_md *lsm = op_data->op_mea1;
1599         struct lmv_oinfo *oinfo;
1600         struct lmv_tgt_desc *tgt;
1601
1602         if (lmv_dir_foreign(lsm))
1603                 return ERR_PTR(-ENODATA);
1604
1605         /* During creating VOLATILE file, it should honor the mdt
1606          * index if the file under striped dir is being restored, see
1607          * ct_restore(). */
1608         if (op_data->op_bias & MDS_CREATE_VOLATILE &&
1609             op_data->op_mds != LMV_OFFSET_DEFAULT) {
1610                 tgt = lmv_tgt(lmv, op_data->op_mds);
1611                 if (!tgt)
1612                         return ERR_PTR(-ENODEV);
1613
1614                 if (lmv_dir_striped(lsm)) {
1615                         int i;
1616
1617                         /* refill the right parent fid */
1618                         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
1619                                 oinfo = &lsm->lsm_md_oinfo[i];
1620                                 if (oinfo->lmo_mds == op_data->op_mds) {
1621                                         op_data->op_fid1 = oinfo->lmo_fid;
1622                                         break;
1623                                 }
1624                         }
1625
1626                         if (i == lsm->lsm_md_stripe_count)
1627                                 op_data->op_fid1 = lsm->lsm_md_oinfo[0].lmo_fid;
1628                 }
1629         } else if (lmv_dir_bad_hash(lsm)) {
1630                 LASSERT(op_data->op_stripe_index < lsm->lsm_md_stripe_count);
1631                 oinfo = &lsm->lsm_md_oinfo[op_data->op_stripe_index];
1632
1633                 op_data->op_fid1 = oinfo->lmo_fid;
1634                 op_data->op_mds = oinfo->lmo_mds;
1635                 tgt = lmv_tgt(lmv, oinfo->lmo_mds);
1636                 if (!tgt)
1637                         return ERR_PTR(-ENODEV);
1638         } else {
1639                 tgt = lmv_locate_tgt_by_name(lmv, op_data->op_mea1,
1640                                 op_data->op_name, op_data->op_namelen,
1641                                 &op_data->op_fid1, &op_data->op_mds,
1642                                 op_data->op_new_layout);
1643         }
1644
1645         return tgt;
1646 }
1647
1648 /* Locate MDT of op_data->op_fid2 for link/rename */
1649 static struct lmv_tgt_desc *
1650 lmv_locate_tgt2(struct lmv_obd *lmv, struct md_op_data *op_data)
1651 {
1652         struct lmv_tgt_desc *tgt;
1653         int rc;
1654
1655         LASSERT(op_data->op_name);
1656         if (lmv_dir_layout_changing(op_data->op_mea2)) {
1657                 struct lu_fid fid1 = op_data->op_fid1;
1658                 struct lmv_stripe_md *lsm1 = op_data->op_mea1;
1659                 struct ptlrpc_request *request = NULL;
1660
1661                 /*
1662                  * avoid creating new file under old layout of migrating
1663                  * directory, check it here.
1664                  */
1665                 tgt = lmv_locate_tgt_by_name(lmv, op_data->op_mea2,
1666                                 op_data->op_name, op_data->op_namelen,
1667                                 &op_data->op_fid2, &op_data->op_mds, false);
1668                 if (IS_ERR(tgt))
1669                         RETURN(tgt);
1670
1671                 op_data->op_fid1 = op_data->op_fid2;
1672                 op_data->op_mea1 = op_data->op_mea2;
1673                 rc = md_getattr_name(tgt->ltd_exp, op_data, &request);
1674                 op_data->op_fid1 = fid1;
1675                 op_data->op_mea1 = lsm1;
1676                 if (!rc) {
1677                         ptlrpc_req_finished(request);
1678                         RETURN(ERR_PTR(-EEXIST));
1679                 }
1680
1681                 if (rc != -ENOENT)
1682                         RETURN(ERR_PTR(rc));
1683         }
1684
1685         return lmv_locate_tgt_by_name(lmv, op_data->op_mea2, op_data->op_name,
1686                                 op_data->op_namelen, &op_data->op_fid2,
1687                                 &op_data->op_mds, true);
1688 }
1689
1690 int lmv_old_layout_lookup(struct lmv_obd *lmv, struct md_op_data *op_data)
1691 {
1692         struct lu_tgt_desc *tgt;
1693         struct ptlrpc_request *request;
1694         int rc;
1695
1696         LASSERT(lmv_dir_layout_changing(op_data->op_mea1));
1697         LASSERT(!op_data->op_new_layout);
1698
1699         tgt = lmv_locate_tgt(lmv, op_data);
1700         if (IS_ERR(tgt))
1701                 return PTR_ERR(tgt);
1702
1703         rc = md_getattr_name(tgt->ltd_exp, op_data, &request);
1704         if (!rc) {
1705                 ptlrpc_req_finished(request);
1706                 return -EEXIST;
1707         }
1708
1709         return rc;
1710 }
1711
1712 /* mkdir by QoS in two cases:
1713  * 1. 'lfs mkdir -i -1'
1714  * 2. parent default LMV master_mdt_index is -1
1715  *
1716  * NB, mkdir by QoS only if parent is not striped, this is to avoid remote
1717  * directories under striped directory.
1718  */
1719 static inline bool lmv_op_qos_mkdir(const struct md_op_data *op_data)
1720 {
1721         const struct lmv_stripe_md *lsm = op_data->op_default_mea1;
1722         const struct lmv_user_md *lum = op_data->op_data;
1723
1724         if (op_data->op_code != LUSTRE_OPC_MKDIR)
1725                 return false;
1726
1727         if (lmv_dir_striped(op_data->op_mea1))
1728                 return false;
1729
1730         if (op_data->op_cli_flags & CLI_SET_MEA && lum &&
1731             (le32_to_cpu(lum->lum_magic) == LMV_USER_MAGIC ||
1732              le32_to_cpu(lum->lum_magic) == LMV_USER_MAGIC_SPECIFIC) &&
1733             le32_to_cpu(lum->lum_stripe_offset) == LMV_OFFSET_DEFAULT)
1734                 return true;
1735
1736         if (lsm && lsm->lsm_md_master_mdt_index == LMV_OFFSET_DEFAULT)
1737                 return true;
1738
1739         return false;
1740 }
1741
1742 /* 'lfs mkdir -i <specific_MDT>' */
1743 static inline bool lmv_op_user_specific_mkdir(const struct md_op_data *op_data)
1744 {
1745         const struct lmv_user_md *lum = op_data->op_data;
1746
1747         return op_data->op_code == LUSTRE_OPC_MKDIR &&
1748                op_data->op_cli_flags & CLI_SET_MEA && lum &&
1749                (le32_to_cpu(lum->lum_magic) == LMV_USER_MAGIC ||
1750                 le32_to_cpu(lum->lum_magic) == LMV_USER_MAGIC_SPECIFIC) &&
1751                le32_to_cpu(lum->lum_stripe_offset) != LMV_OFFSET_DEFAULT;
1752 }
1753
1754 /* parent default LMV master_mdt_index is not -1. */
1755 static inline bool
1756 lmv_op_default_specific_mkdir(const struct md_op_data *op_data)
1757 {
1758         return op_data->op_code == LUSTRE_OPC_MKDIR &&
1759                op_data->op_default_mea1 &&
1760                op_data->op_default_mea1->lsm_md_master_mdt_index !=
1761                         LMV_OFFSET_DEFAULT;
1762 }
1763 int lmv_create(struct obd_export *exp, struct md_op_data *op_data,
1764                 const void *data, size_t datalen, umode_t mode, uid_t uid,
1765                 gid_t gid, cfs_cap_t cap_effective, __u64 rdev,
1766                 struct ptlrpc_request **request)
1767 {
1768         struct obd_device *obd = exp->exp_obd;
1769         struct lmv_obd *lmv = &obd->u.lmv;
1770         struct lmv_tgt_desc *tgt;
1771         int rc;
1772
1773         ENTRY;
1774
1775         if (!lmv->lmv_mdt_descs.ltd_lmv_desc.ld_active_tgt_count)
1776                 RETURN(-EIO);
1777
1778         if (lmv_dir_bad_hash(op_data->op_mea1))
1779                 RETURN(-EBADF);
1780
1781         if (lmv_dir_layout_changing(op_data->op_mea1)) {
1782                 /*
1783                  * if parent is migrating, create() needs to lookup existing
1784                  * name in both old and new layout, check old layout on client.
1785                  */
1786                 rc = lmv_old_layout_lookup(lmv, op_data);
1787                 if (rc != -ENOENT)
1788                         RETURN(rc);
1789
1790                 op_data->op_new_layout = true;
1791         }
1792
1793         tgt = lmv_locate_tgt(lmv, op_data);
1794         if (IS_ERR(tgt))
1795                 RETURN(PTR_ERR(tgt));
1796
1797         if (lmv_op_qos_mkdir(op_data)) {
1798                 tgt = lmv_locate_tgt_qos(lmv, &op_data->op_mds);
1799                 if (tgt == ERR_PTR(-EAGAIN))
1800                         tgt = lmv_locate_tgt_rr(lmv, &op_data->op_mds);
1801                 /*
1802                  * only update statfs after QoS mkdir, this means the cached
1803                  * statfs may be stale, and current mkdir may not follow QoS
1804                  * accurately, but it's not serious, and avoids periodic statfs
1805                  * when client doesn't mkdir by QoS.
1806                  */
1807                 if (!IS_ERR(tgt))
1808                         lmv_statfs_check_update(obd, tgt);
1809         } else if (lmv_op_user_specific_mkdir(op_data)) {
1810                 struct lmv_user_md *lum = op_data->op_data;
1811
1812                 op_data->op_mds = le32_to_cpu(lum->lum_stripe_offset);
1813                 tgt = lmv_tgt(lmv, op_data->op_mds);
1814                 if (!tgt)
1815                         RETURN(-ENODEV);
1816         } else if (lmv_op_default_specific_mkdir(op_data)) {
1817                 op_data->op_mds =
1818                         op_data->op_default_mea1->lsm_md_master_mdt_index;
1819                 tgt = lmv_tgt(lmv, op_data->op_mds);
1820                 if (!tgt)
1821                         RETURN(-ENODEV);
1822         }
1823
1824         if (IS_ERR(tgt))
1825                 RETURN(PTR_ERR(tgt));
1826
1827         rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
1828         if (rc)
1829                 RETURN(rc);
1830
1831         CDEBUG(D_INODE, "CREATE name '%.*s' "DFID" on "DFID" -> mds #%x\n",
1832                 (int)op_data->op_namelen, op_data->op_name,
1833                 PFID(&op_data->op_fid2), PFID(&op_data->op_fid1),
1834                 op_data->op_mds);
1835
1836         op_data->op_flags |= MF_MDC_CANCEL_FID1;
1837         rc = md_create(tgt->ltd_exp, op_data, data, datalen, mode, uid, gid,
1838                        cap_effective, rdev, request);
1839         if (rc == 0) {
1840                 if (*request == NULL)
1841                         RETURN(rc);
1842                 CDEBUG(D_INODE, "Created - "DFID"\n", PFID(&op_data->op_fid2));
1843         }
1844         RETURN(rc);
1845 }
1846
1847 static int
1848 lmv_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1849             const union ldlm_policy_data *policy, struct md_op_data *op_data,
1850             struct lustre_handle *lockh, __u64 extra_lock_flags)
1851 {
1852         struct obd_device *obd = exp->exp_obd;
1853         struct lmv_obd *lmv = &obd->u.lmv;
1854         struct lmv_tgt_desc *tgt;
1855         int rc;
1856
1857         ENTRY;
1858
1859         CDEBUG(D_INODE, "ENQUEUE on "DFID"\n", PFID(&op_data->op_fid1));
1860
1861         tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
1862         if (IS_ERR(tgt))
1863                 RETURN(PTR_ERR(tgt));
1864
1865         CDEBUG(D_INODE, "ENQUEUE on "DFID" -> mds #%u\n",
1866                PFID(&op_data->op_fid1), tgt->ltd_index);
1867
1868         rc = md_enqueue(tgt->ltd_exp, einfo, policy, op_data, lockh,
1869                         extra_lock_flags);
1870
1871         RETURN(rc);
1872 }
1873
1874 int
1875 lmv_getattr_name(struct obd_export *exp,struct md_op_data *op_data,
1876                  struct ptlrpc_request **preq)
1877 {
1878         struct obd_device *obd = exp->exp_obd;
1879         struct lmv_obd *lmv = &obd->u.lmv;
1880         struct lmv_tgt_desc *tgt;
1881         struct mdt_body *body;
1882         int rc;
1883
1884         ENTRY;
1885
1886 retry:
1887         tgt = lmv_locate_tgt(lmv, op_data);
1888         if (IS_ERR(tgt))
1889                 RETURN(PTR_ERR(tgt));
1890
1891         CDEBUG(D_INODE, "GETATTR_NAME for %*s on "DFID" -> mds #%d\n",
1892                 (int)op_data->op_namelen, op_data->op_name,
1893                 PFID(&op_data->op_fid1), tgt->ltd_index);
1894
1895         rc = md_getattr_name(tgt->ltd_exp, op_data, preq);
1896         if (rc == -ENOENT && lmv_dir_retry_check_update(op_data)) {
1897                 ptlrpc_req_finished(*preq);
1898                 *preq = NULL;
1899                 goto retry;
1900         }
1901
1902         if (rc)
1903                 RETURN(rc);
1904
1905         body = req_capsule_server_get(&(*preq)->rq_pill, &RMF_MDT_BODY);
1906         LASSERT(body != NULL);
1907
1908         if (body->mbo_valid & OBD_MD_MDS) {
1909                 op_data->op_fid1 = body->mbo_fid1;
1910                 op_data->op_valid |= OBD_MD_FLCROSSREF;
1911                 op_data->op_namelen = 0;
1912                 op_data->op_name = NULL;
1913
1914                 ptlrpc_req_finished(*preq);
1915                 *preq = NULL;
1916
1917                 goto retry;
1918         }
1919
1920         RETURN(rc);
1921 }
1922
1923 #define md_op_data_fid(op_data, fl)                     \
1924         (fl == MF_MDC_CANCEL_FID1 ? &op_data->op_fid1 : \
1925          fl == MF_MDC_CANCEL_FID2 ? &op_data->op_fid2 : \
1926          fl == MF_MDC_CANCEL_FID3 ? &op_data->op_fid3 : \
1927          fl == MF_MDC_CANCEL_FID4 ? &op_data->op_fid4 : \
1928          NULL)
1929
1930 static int lmv_early_cancel(struct obd_export *exp, struct lmv_tgt_desc *tgt,
1931                             struct md_op_data *op_data, __u32 op_tgt,
1932                             enum ldlm_mode mode, int bits, int flag)
1933 {
1934         struct lu_fid *fid = md_op_data_fid(op_data, flag);
1935         struct lmv_obd *lmv = &exp->exp_obd->u.lmv;
1936         union ldlm_policy_data policy = { { 0 } };
1937         int rc = 0;
1938         ENTRY;
1939
1940         if (!fid_is_sane(fid))
1941                 RETURN(0);
1942
1943         if (tgt == NULL) {
1944                 tgt = lmv_fid2tgt(lmv, fid);
1945                 if (IS_ERR(tgt))
1946                         RETURN(PTR_ERR(tgt));
1947         }
1948
1949         if (tgt->ltd_index != op_tgt) {
1950                 CDEBUG(D_INODE, "EARLY_CANCEL on "DFID"\n", PFID(fid));
1951                 policy.l_inodebits.bits = bits;
1952                 rc = md_cancel_unused(tgt->ltd_exp, fid, &policy,
1953                                       mode, LCF_ASYNC, NULL);
1954         } else {
1955                 CDEBUG(D_INODE,
1956                        "EARLY_CANCEL skip operation target %d on "DFID"\n",
1957                        op_tgt, PFID(fid));
1958                 op_data->op_flags |= flag;
1959                 rc = 0;
1960         }
1961
1962         RETURN(rc);
1963 }
1964
1965 /*
1966  * llite passes fid of an target inode in op_data->op_fid1 and id of directory in
1967  * op_data->op_fid2
1968  */
1969 static int lmv_link(struct obd_export *exp, struct md_op_data *op_data,
1970                     struct ptlrpc_request **request)
1971 {
1972         struct obd_device       *obd = exp->exp_obd;
1973         struct lmv_obd          *lmv = &obd->u.lmv;
1974         struct lmv_tgt_desc     *tgt;
1975         int                      rc;
1976         ENTRY;
1977
1978         LASSERT(op_data->op_namelen != 0);
1979
1980         CDEBUG(D_INODE, "LINK "DFID":%*s to "DFID"\n",
1981                PFID(&op_data->op_fid2), (int)op_data->op_namelen,
1982                op_data->op_name, PFID(&op_data->op_fid1));
1983
1984         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
1985         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
1986         op_data->op_cap = cfs_curproc_cap_pack();
1987
1988         tgt = lmv_locate_tgt2(lmv, op_data);
1989         if (IS_ERR(tgt))
1990                 RETURN(PTR_ERR(tgt));
1991
1992         /*
1993          * Cancel UPDATE lock on child (fid1).
1994          */
1995         op_data->op_flags |= MF_MDC_CANCEL_FID2;
1996         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_index, LCK_EX,
1997                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
1998         if (rc != 0)
1999                 RETURN(rc);
2000
2001         rc = md_link(tgt->ltd_exp, op_data, request);
2002
2003         RETURN(rc);
2004 }
2005
2006 static int lmv_migrate(struct obd_export *exp, struct md_op_data *op_data,
2007                         const char *name, size_t namelen,
2008                         struct ptlrpc_request **request)
2009 {
2010         struct obd_device *obd = exp->exp_obd;
2011         struct lmv_obd *lmv = &obd->u.lmv;
2012         struct lmv_stripe_md *lsm = op_data->op_mea1;
2013         struct lmv_tgt_desc *parent_tgt;
2014         struct lmv_tgt_desc *sp_tgt;
2015         struct lmv_tgt_desc *tp_tgt = NULL;
2016         struct lmv_tgt_desc *child_tgt;
2017         struct lmv_tgt_desc *tgt;
2018         struct lu_fid target_fid = { 0 };
2019         int rc;
2020
2021         ENTRY;
2022
2023         LASSERT(op_data->op_cli_flags & CLI_MIGRATE);
2024
2025         CDEBUG(D_INODE, "MIGRATE "DFID"/%.*s\n",
2026                PFID(&op_data->op_fid1), (int)namelen, name);
2027
2028         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2029         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2030         op_data->op_cap = cfs_curproc_cap_pack();
2031
2032         parent_tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
2033         if (IS_ERR(parent_tgt))
2034                 RETURN(PTR_ERR(parent_tgt));
2035
2036         if (lmv_dir_striped(lsm)) {
2037                 const struct lmv_oinfo *oinfo;
2038
2039                 oinfo = lsm_name_to_stripe_info(lsm, name, namelen, false);
2040                 if (IS_ERR(oinfo))
2041                         RETURN(PTR_ERR(oinfo));
2042
2043                 /* save source stripe FID in fid4 temporarily for ELC */
2044                 op_data->op_fid4 = oinfo->lmo_fid;
2045                 sp_tgt = lmv_tgt(lmv, oinfo->lmo_mds);
2046                 if (!sp_tgt)
2047                         RETURN(-ENODEV);
2048
2049                 /*
2050                  * if parent is being migrated too, fill op_fid2 with target
2051                  * stripe fid, otherwise the target stripe is not created yet.
2052                  */
2053                 if (lmv_dir_layout_changing(lsm)) {
2054                         oinfo = lsm_name_to_stripe_info(lsm, name, namelen,
2055                                                         true);
2056                         if (IS_ERR(oinfo))
2057                                 RETURN(PTR_ERR(oinfo));
2058
2059                         op_data->op_fid2 = oinfo->lmo_fid;
2060                         tp_tgt = lmv_tgt(lmv, oinfo->lmo_mds);
2061                         if (!tp_tgt)
2062                                 RETURN(-ENODEV);
2063                 }
2064         } else {
2065                 sp_tgt = parent_tgt;
2066         }
2067
2068         child_tgt = lmv_fid2tgt(lmv, &op_data->op_fid3);
2069         if (IS_ERR(child_tgt))
2070                 RETURN(PTR_ERR(child_tgt));
2071
2072         /* for directory, migrate to MDT specified by lum_stripe_offset;
2073          * otherwise migrate to the target stripe of parent, but parent
2074          * directory may have finished migration (normally current file too),
2075          * allocate FID on MDT lum_stripe_offset, and server will check
2076          * whether file was migrated already.
2077          */
2078         if (S_ISDIR(op_data->op_mode) || !tp_tgt) {
2079                 struct lmv_user_md *lum = op_data->op_data;
2080
2081                 op_data->op_mds = le32_to_cpu(lum->lum_stripe_offset);
2082         } else  {
2083                 op_data->op_mds = tp_tgt->ltd_index;
2084         }
2085         rc = lmv_fid_alloc(NULL, exp, &target_fid, op_data);
2086         if (rc)
2087                 RETURN(rc);
2088
2089         /*
2090          * for directory, send migrate request to the MDT where the object will
2091          * be migrated to, because we can't create a striped directory remotely.
2092          *
2093          * otherwise, send to the MDT where source is located because regular
2094          * file may open lease.
2095          *
2096          * NB. if MDT doesn't support DIR_MIGRATE, send to source MDT too for
2097          * backward compatibility.
2098          */
2099         if (S_ISDIR(op_data->op_mode) &&
2100             (exp_connect_flags2(exp) & OBD_CONNECT2_DIR_MIGRATE)) {
2101                 tgt = lmv_fid2tgt(lmv, &target_fid);
2102                 if (IS_ERR(tgt))
2103                         RETURN(PTR_ERR(tgt));
2104         } else {
2105                 tgt = child_tgt;
2106         }
2107
2108         /* cancel UPDATE lock of parent master object */
2109         rc = lmv_early_cancel(exp, parent_tgt, op_data, tgt->ltd_index, LCK_EX,
2110                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2111         if (rc)
2112                 RETURN(rc);
2113
2114         /* cancel UPDATE lock of source parent */
2115         if (sp_tgt != parent_tgt) {
2116                 /*
2117                  * migrate RPC packs master object FID, because we can only pack
2118                  * two FIDs in reint RPC, but MDS needs to know both source
2119                  * parent and target parent, and it will obtain them from master
2120                  * FID and LMV, the other FID in RPC is kept for target.
2121                  *
2122                  * since this FID is not passed to MDC, cancel it anyway.
2123                  */
2124                 rc = lmv_early_cancel(exp, sp_tgt, op_data, -1, LCK_EX,
2125                                       MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID4);
2126                 if (rc)
2127                         RETURN(rc);
2128
2129                 op_data->op_flags &= ~MF_MDC_CANCEL_FID4;
2130         }
2131         op_data->op_fid4 = target_fid;
2132
2133         /* cancel UPDATE locks of target parent */
2134         rc = lmv_early_cancel(exp, tp_tgt, op_data, tgt->ltd_index, LCK_EX,
2135                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID2);
2136         if (rc)
2137                 RETURN(rc);
2138
2139         /* cancel LOOKUP lock of source if source is remote object */
2140         if (child_tgt != sp_tgt) {
2141                 rc = lmv_early_cancel(exp, sp_tgt, op_data, tgt->ltd_index,
2142                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2143                                       MF_MDC_CANCEL_FID3);
2144                 if (rc)
2145                         RETURN(rc);
2146         }
2147
2148         /* cancel ELC locks of source */
2149         rc = lmv_early_cancel(exp, child_tgt, op_data, tgt->ltd_index, LCK_EX,
2150                               MDS_INODELOCK_ELC, MF_MDC_CANCEL_FID3);
2151         if (rc)
2152                 RETURN(rc);
2153
2154         rc = md_rename(tgt->ltd_exp, op_data, name, namelen, NULL, 0, request);
2155
2156         RETURN(rc);
2157 }
2158
2159 static int lmv_rename(struct obd_export *exp, struct md_op_data *op_data,
2160                       const char *old, size_t oldlen,
2161                       const char *new, size_t newlen,
2162                       struct ptlrpc_request **request)
2163 {
2164         struct obd_device *obd = exp->exp_obd;
2165         struct lmv_obd *lmv = &obd->u.lmv;
2166         struct lmv_tgt_desc *sp_tgt;
2167         struct lmv_tgt_desc *tp_tgt = NULL;
2168         struct lmv_tgt_desc *src_tgt = NULL;
2169         struct lmv_tgt_desc *tgt;
2170         struct mdt_body *body;
2171         int rc;
2172
2173         ENTRY;
2174
2175         LASSERT(oldlen != 0);
2176
2177         if (op_data->op_cli_flags & CLI_MIGRATE) {
2178                 rc = lmv_migrate(exp, op_data, old, oldlen, request);
2179                 RETURN(rc);
2180         }
2181
2182         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2183         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2184         op_data->op_cap = cfs_curproc_cap_pack();
2185
2186         op_data->op_name = new;
2187         op_data->op_namelen = newlen;
2188
2189         tp_tgt = lmv_locate_tgt2(lmv, op_data);
2190         if (IS_ERR(tp_tgt))
2191                 RETURN(PTR_ERR(tp_tgt));
2192
2193         /* Since the target child might be destroyed, and it might become
2194          * orphan, and we can only check orphan on the local MDT right now, so
2195          * we send rename request to the MDT where target child is located. If
2196          * target child does not exist, then it will send the request to the
2197          * target parent */
2198         if (fid_is_sane(&op_data->op_fid4)) {
2199                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid4);
2200                 if (IS_ERR(tgt))
2201                         RETURN(PTR_ERR(tgt));
2202         } else {
2203                 tgt = tp_tgt;
2204         }
2205
2206         op_data->op_flags |= MF_MDC_CANCEL_FID4;
2207
2208         /* cancel UPDATE locks of target parent */
2209         rc = lmv_early_cancel(exp, tp_tgt, op_data, tgt->ltd_index, LCK_EX,
2210                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID2);
2211         if (rc != 0)
2212                 RETURN(rc);
2213
2214         if (fid_is_sane(&op_data->op_fid4)) {
2215                 /* cancel LOOKUP lock of target on target parent */
2216                 if (tgt != tp_tgt) {
2217                         rc = lmv_early_cancel(exp, tp_tgt, op_data,
2218                                               tgt->ltd_index, LCK_EX,
2219                                               MDS_INODELOCK_LOOKUP,
2220                                               MF_MDC_CANCEL_FID4);
2221                         if (rc != 0)
2222                                 RETURN(rc);
2223                 }
2224         }
2225
2226         if (fid_is_sane(&op_data->op_fid3)) {
2227                 src_tgt = lmv_fid2tgt(lmv, &op_data->op_fid3);
2228                 if (IS_ERR(src_tgt))
2229                         RETURN(PTR_ERR(src_tgt));
2230
2231                 /* cancel ELC locks of source */
2232                 rc = lmv_early_cancel(exp, src_tgt, op_data, tgt->ltd_index,
2233                                       LCK_EX, MDS_INODELOCK_ELC,
2234                                       MF_MDC_CANCEL_FID3);
2235                 if (rc != 0)
2236                         RETURN(rc);
2237         }
2238
2239         op_data->op_name = old;
2240         op_data->op_namelen = oldlen;
2241 retry:
2242         sp_tgt = lmv_locate_tgt(lmv, op_data);
2243         if (IS_ERR(sp_tgt))
2244                 RETURN(PTR_ERR(sp_tgt));
2245
2246         /* cancel UPDATE locks of source parent */
2247         rc = lmv_early_cancel(exp, sp_tgt, op_data, tgt->ltd_index, LCK_EX,
2248                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2249         if (rc != 0)
2250                 RETURN(rc);
2251
2252         if (fid_is_sane(&op_data->op_fid3)) {
2253                 /* cancel LOOKUP lock of source on source parent */
2254                 if (src_tgt != sp_tgt) {
2255                         rc = lmv_early_cancel(exp, sp_tgt, op_data,
2256                                               tgt->ltd_index, LCK_EX,
2257                                               MDS_INODELOCK_LOOKUP,
2258                                               MF_MDC_CANCEL_FID3);
2259                         if (rc != 0)
2260                                 RETURN(rc);
2261                 }
2262         }
2263
2264 rename:
2265         CDEBUG(D_INODE, "RENAME "DFID"/%.*s to "DFID"/%.*s\n",
2266                 PFID(&op_data->op_fid1), (int)oldlen, old,
2267                 PFID(&op_data->op_fid2), (int)newlen, new);
2268
2269         rc = md_rename(tgt->ltd_exp, op_data, old, oldlen, new, newlen,
2270                         request);
2271         if (rc == -ENOENT && lmv_dir_retry_check_update(op_data)) {
2272                 ptlrpc_req_finished(*request);
2273                 *request = NULL;
2274                 goto retry;
2275         }
2276
2277         if (rc && rc != -EXDEV)
2278                 RETURN(rc);
2279
2280         body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
2281         if (body == NULL)
2282                 RETURN(-EPROTO);
2283
2284         /* Not cross-ref case, just get out of here. */
2285         if (likely(!(body->mbo_valid & OBD_MD_MDS)))
2286                 RETURN(rc);
2287
2288         op_data->op_fid4 = body->mbo_fid1;
2289
2290         ptlrpc_req_finished(*request);
2291         *request = NULL;
2292
2293         tgt = lmv_fid2tgt(lmv, &op_data->op_fid4);
2294         if (IS_ERR(tgt))
2295                 RETURN(PTR_ERR(tgt));
2296
2297         if (fid_is_sane(&op_data->op_fid4)) {
2298                 /* cancel LOOKUP lock of target on target parent */
2299                 if (tgt != tp_tgt) {
2300                         rc = lmv_early_cancel(exp, tp_tgt, op_data,
2301                                               tgt->ltd_index, LCK_EX,
2302                                               MDS_INODELOCK_LOOKUP,
2303                                               MF_MDC_CANCEL_FID4);
2304                         if (rc != 0)
2305                                 RETURN(rc);
2306                 }
2307         }
2308
2309         goto rename;
2310 }
2311
2312 static int lmv_setattr(struct obd_export *exp, struct md_op_data *op_data,
2313                        void *ea, size_t ealen, struct ptlrpc_request **request)
2314 {
2315         struct obd_device *obd = exp->exp_obd;
2316         struct lmv_obd *lmv = &obd->u.lmv;
2317         struct lmv_tgt_desc *tgt;
2318         int rc = 0;
2319
2320         ENTRY;
2321
2322         CDEBUG(D_INODE, "SETATTR for "DFID", valid 0x%x/0x%x\n",
2323                PFID(&op_data->op_fid1), op_data->op_attr.ia_valid,
2324                op_data->op_xvalid);
2325
2326         op_data->op_flags |= MF_MDC_CANCEL_FID1;
2327         tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
2328         if (IS_ERR(tgt))
2329                 RETURN(PTR_ERR(tgt));
2330
2331         rc = md_setattr(tgt->ltd_exp, op_data, ea, ealen, request);
2332
2333         RETURN(rc);
2334 }
2335
2336 static int lmv_fsync(struct obd_export *exp, const struct lu_fid *fid,
2337                      struct ptlrpc_request **request)
2338 {
2339         struct obd_device *obd = exp->exp_obd;
2340         struct lmv_obd *lmv = &obd->u.lmv;
2341         struct lmv_tgt_desc *tgt;
2342         int rc;
2343
2344         ENTRY;
2345
2346         tgt = lmv_fid2tgt(lmv, fid);
2347         if (IS_ERR(tgt))
2348                 RETURN(PTR_ERR(tgt));
2349
2350         rc = md_fsync(tgt->ltd_exp, fid, request);
2351         RETURN(rc);
2352 }
2353
2354 struct stripe_dirent {
2355         struct page             *sd_page;
2356         struct lu_dirpage       *sd_dp;
2357         struct lu_dirent        *sd_ent;
2358         bool                     sd_eof;
2359 };
2360
2361 struct lmv_dir_ctxt {
2362         struct lmv_obd          *ldc_lmv;
2363         struct md_op_data       *ldc_op_data;
2364         struct md_callback      *ldc_cb_op;
2365         __u64                    ldc_hash;
2366         int                      ldc_count;
2367         struct stripe_dirent     ldc_stripes[0];
2368 };
2369
2370 static inline void stripe_dirent_unload(struct stripe_dirent *stripe)
2371 {
2372         if (stripe->sd_page) {
2373                 kunmap(stripe->sd_page);
2374                 put_page(stripe->sd_page);
2375                 stripe->sd_page = NULL;
2376                 stripe->sd_ent = NULL;
2377         }
2378 }
2379
2380 static inline void put_lmv_dir_ctxt(struct lmv_dir_ctxt *ctxt)
2381 {
2382         int i;
2383
2384         for (i = 0; i < ctxt->ldc_count; i++)
2385                 stripe_dirent_unload(&ctxt->ldc_stripes[i]);
2386 }
2387
2388 /* if @ent is dummy, or . .., get next */
2389 static struct lu_dirent *stripe_dirent_get(struct lmv_dir_ctxt *ctxt,
2390                                            struct lu_dirent *ent,
2391                                            int stripe_index)
2392 {
2393         for (; ent; ent = lu_dirent_next(ent)) {
2394                 /* Skip dummy entry */
2395                 if (le16_to_cpu(ent->lde_namelen) == 0)
2396                         continue;
2397
2398                 /* skip . and .. for other stripes */
2399                 if (stripe_index &&
2400                     (strncmp(ent->lde_name, ".",
2401                              le16_to_cpu(ent->lde_namelen)) == 0 ||
2402                      strncmp(ent->lde_name, "..",
2403                              le16_to_cpu(ent->lde_namelen)) == 0))
2404                         continue;
2405
2406                 if (le64_to_cpu(ent->lde_hash) >= ctxt->ldc_hash)
2407                         break;
2408         }
2409
2410         return ent;
2411 }
2412
2413 static struct lu_dirent *stripe_dirent_load(struct lmv_dir_ctxt *ctxt,
2414                                             struct stripe_dirent *stripe,
2415                                             int stripe_index)
2416 {
2417         struct md_op_data *op_data = ctxt->ldc_op_data;
2418         struct lmv_oinfo *oinfo;
2419         struct lu_fid fid = op_data->op_fid1;
2420         struct inode *inode = op_data->op_data;
2421         struct lmv_tgt_desc *tgt;
2422         struct lu_dirent *ent = stripe->sd_ent;
2423         __u64 hash = ctxt->ldc_hash;
2424         int rc = 0;
2425
2426         ENTRY;
2427
2428         LASSERT(stripe == &ctxt->ldc_stripes[stripe_index]);
2429         LASSERT(!ent);
2430
2431         do {
2432                 if (stripe->sd_page) {
2433                         __u64 end = le64_to_cpu(stripe->sd_dp->ldp_hash_end);
2434
2435                         /* @hash should be the last dirent hash */
2436                         LASSERTF(hash <= end,
2437                                  "ctxt@%p stripe@%p hash %llx end %llx\n",
2438                                  ctxt, stripe, hash, end);
2439                         /* unload last page */
2440                         stripe_dirent_unload(stripe);
2441                         /* eof */
2442                         if (end == MDS_DIR_END_OFF) {
2443                                 stripe->sd_eof = true;
2444                                 break;
2445                         }
2446                         hash = end;
2447                 }
2448
2449                 oinfo = &op_data->op_mea1->lsm_md_oinfo[stripe_index];
2450                 if (!oinfo->lmo_root) {
2451                         rc = -ENOENT;
2452                         break;
2453                 }
2454
2455                 tgt = lmv_tgt(ctxt->ldc_lmv, oinfo->lmo_mds);
2456                 if (!tgt) {
2457                         rc = -ENODEV;
2458                         break;
2459                 }
2460
2461                 /* op_data is shared by stripes, reset after use */
2462                 op_data->op_fid1 = oinfo->lmo_fid;
2463                 op_data->op_fid2 = oinfo->lmo_fid;
2464                 op_data->op_data = oinfo->lmo_root;
2465
2466                 rc = md_read_page(tgt->ltd_exp, op_data, ctxt->ldc_cb_op, hash,
2467                                   &stripe->sd_page);
2468
2469                 op_data->op_fid1 = fid;
2470                 op_data->op_fid2 = fid;
2471                 op_data->op_data = inode;
2472
2473                 if (rc)
2474                         break;
2475
2476                 stripe->sd_dp = page_address(stripe->sd_page);
2477                 ent = stripe_dirent_get(ctxt, lu_dirent_start(stripe->sd_dp),
2478                                         stripe_index);
2479                 /* in case a page filled with ., .. and dummy, read next */
2480         } while (!ent);
2481
2482         stripe->sd_ent = ent;
2483         if (rc) {
2484                 LASSERT(!ent);
2485                 /* treat error as eof, so dir can be partially accessed */
2486                 stripe->sd_eof = true;
2487                 LCONSOLE_WARN("dir "DFID" stripe %d readdir failed: %d, "
2488                               "directory is partially accessed!\n",
2489                               PFID(&ctxt->ldc_op_data->op_fid1), stripe_index,
2490                               rc);
2491         }
2492
2493         RETURN(ent);
2494 }
2495
2496 static int lmv_file_resync(struct obd_export *exp, struct md_op_data *data)
2497 {
2498         struct obd_device *obd = exp->exp_obd;
2499         struct lmv_obd *lmv = &obd->u.lmv;
2500         struct lmv_tgt_desc *tgt;
2501         int rc;
2502
2503         ENTRY;
2504
2505         rc = lmv_check_connect(obd);
2506         if (rc != 0)
2507                 RETURN(rc);
2508
2509         tgt = lmv_fid2tgt(lmv, &data->op_fid1);
2510         if (IS_ERR(tgt))
2511                 RETURN(PTR_ERR(tgt));
2512
2513         data->op_flags |= MF_MDC_CANCEL_FID1;
2514         rc = md_file_resync(tgt->ltd_exp, data);
2515         RETURN(rc);
2516 }
2517
2518 /**
2519  * Get dirent with the closest hash for striped directory
2520  *
2521  * This function will search the dir entry, whose hash value is the
2522  * closest(>=) to hash from all of sub-stripes, and it is only being called
2523  * for striped directory.
2524  *
2525  * \param[in] ctxt              dir read context
2526  *
2527  * \retval                      dirent get the entry successfully
2528  *                              NULL does not get the entry, normally it means
2529  *                              it reaches the end of the directory, while read
2530  *                              stripe dirent error is ignored to allow partial
2531  *                              access.
2532  */
2533 static struct lu_dirent *lmv_dirent_next(struct lmv_dir_ctxt *ctxt)
2534 {
2535         struct stripe_dirent *stripe;
2536         struct lu_dirent *ent = NULL;
2537         int i;
2538         int min = -1;
2539
2540         /* TODO: optimize with k-way merge sort */
2541         for (i = 0; i < ctxt->ldc_count; i++) {
2542                 stripe = &ctxt->ldc_stripes[i];
2543                 if (stripe->sd_eof)
2544                         continue;
2545
2546                 if (!stripe->sd_ent) {
2547                         stripe_dirent_load(ctxt, stripe, i);
2548                         if (!stripe->sd_ent) {
2549                                 LASSERT(stripe->sd_eof);
2550                                 continue;
2551                         }
2552                 }
2553
2554                 if (min == -1 ||
2555                     le64_to_cpu(ctxt->ldc_stripes[min].sd_ent->lde_hash) >
2556                     le64_to_cpu(stripe->sd_ent->lde_hash)) {
2557                         min = i;
2558                         if (le64_to_cpu(stripe->sd_ent->lde_hash) ==
2559                             ctxt->ldc_hash)
2560                                 break;
2561                 }
2562         }
2563
2564         if (min != -1) {
2565                 stripe = &ctxt->ldc_stripes[min];
2566                 ent = stripe->sd_ent;
2567                 /* pop found dirent */
2568                 stripe->sd_ent = stripe_dirent_get(ctxt, lu_dirent_next(ent),
2569                                                    min);
2570         }
2571
2572         return ent;
2573 }
2574
2575 /**
2576  * Build dir entry page for striped directory
2577  *
2578  * This function gets one entry by @offset from a striped directory. It will
2579  * read entries from all of stripes, and choose one closest to the required
2580  * offset(&offset). A few notes
2581  * 1. skip . and .. for non-zero stripes, because there can only have one .
2582  * and .. in a directory.
2583  * 2. op_data will be shared by all of stripes, instead of allocating new
2584  * one, so need to restore before reusing.
2585  *
2586  * \param[in] exp       obd export refer to LMV
2587  * \param[in] op_data   hold those MD parameters of read_entry
2588  * \param[in] cb_op     ldlm callback being used in enqueue in mdc_read_entry
2589  * \param[in] offset    starting hash offset
2590  * \param[out] ppage    the page holding the entry. Note: because the entry
2591  *                      will be accessed in upper layer, so we need hold the
2592  *                      page until the usages of entry is finished, see
2593  *                      ll_dir_entry_next.
2594  *
2595  * retval               =0 if get entry successfully
2596  *                      <0 cannot get entry
2597  */
2598 static int lmv_striped_read_page(struct obd_export *exp,
2599                                  struct md_op_data *op_data,
2600                                  struct md_callback *cb_op,
2601                                  __u64 offset, struct page **ppage)
2602 {
2603         struct page *page = NULL;
2604         struct lu_dirpage *dp;
2605         void *start;
2606         struct lu_dirent *ent;
2607         struct lu_dirent *last_ent;
2608         int stripe_count;
2609         struct lmv_dir_ctxt *ctxt;
2610         struct lu_dirent *next = NULL;
2611         __u16 ent_size;
2612         size_t left_bytes;
2613         int rc = 0;
2614         ENTRY;
2615
2616         /* Allocate a page and read entries from all of stripes and fill
2617          * the page by hash order */
2618         page = alloc_page(GFP_KERNEL);
2619         if (!page)
2620                 RETURN(-ENOMEM);
2621
2622         /* Initialize the entry page */
2623         dp = kmap(page);
2624         memset(dp, 0, sizeof(*dp));
2625         dp->ldp_hash_start = cpu_to_le64(offset);
2626
2627         start = dp + 1;
2628         left_bytes = PAGE_SIZE - sizeof(*dp);
2629         ent = start;
2630         last_ent = ent;
2631
2632         /* initalize dir read context */
2633         stripe_count = op_data->op_mea1->lsm_md_stripe_count;
2634         OBD_ALLOC(ctxt, offsetof(typeof(*ctxt), ldc_stripes[stripe_count]));
2635         if (!ctxt)
2636                 GOTO(free_page, rc = -ENOMEM);
2637         ctxt->ldc_lmv = &exp->exp_obd->u.lmv;
2638         ctxt->ldc_op_data = op_data;
2639         ctxt->ldc_cb_op = cb_op;
2640         ctxt->ldc_hash = offset;
2641         ctxt->ldc_count = stripe_count;
2642
2643         while (1) {
2644                 next = lmv_dirent_next(ctxt);
2645
2646                 /* end of directory */
2647                 if (!next) {
2648                         ctxt->ldc_hash = MDS_DIR_END_OFF;
2649                         break;
2650                 }
2651                 ctxt->ldc_hash = le64_to_cpu(next->lde_hash);
2652
2653                 ent_size = le16_to_cpu(next->lde_reclen);
2654
2655                 /* the last entry lde_reclen is 0, but it might not be the last
2656                  * one of this temporay dir page */
2657                 if (!ent_size)
2658                         ent_size = lu_dirent_calc_size(
2659                                         le16_to_cpu(next->lde_namelen),
2660                                         le32_to_cpu(next->lde_attrs));
2661                 /* page full */
2662                 if (ent_size > left_bytes)
2663                         break;
2664
2665                 memcpy(ent, next, ent_size);
2666
2667                 /* Replace . with master FID and Replace .. with the parent FID
2668                  * of master object */
2669                 if (strncmp(ent->lde_name, ".",
2670                             le16_to_cpu(ent->lde_namelen)) == 0 &&
2671                     le16_to_cpu(ent->lde_namelen) == 1)
2672                         fid_cpu_to_le(&ent->lde_fid, &op_data->op_fid1);
2673                 else if (strncmp(ent->lde_name, "..",
2674                                    le16_to_cpu(ent->lde_namelen)) == 0 &&
2675                            le16_to_cpu(ent->lde_namelen) == 2)
2676                         fid_cpu_to_le(&ent->lde_fid, &op_data->op_fid3);
2677
2678                 CDEBUG(D_INODE, "entry %.*s hash %#llx\n",
2679                        le16_to_cpu(ent->lde_namelen), ent->lde_name,
2680                        le64_to_cpu(ent->lde_hash));
2681
2682                 left_bytes -= ent_size;
2683                 ent->lde_reclen = cpu_to_le16(ent_size);
2684                 last_ent = ent;
2685                 ent = (void *)ent + ent_size;
2686         };
2687
2688         last_ent->lde_reclen = 0;
2689
2690         if (ent == start)
2691                 dp->ldp_flags |= LDF_EMPTY;
2692         else if (ctxt->ldc_hash == le64_to_cpu(last_ent->lde_hash))
2693                 dp->ldp_flags |= LDF_COLLIDE;
2694         dp->ldp_flags = cpu_to_le32(dp->ldp_flags);
2695         dp->ldp_hash_end = cpu_to_le64(ctxt->ldc_hash);
2696
2697         put_lmv_dir_ctxt(ctxt);
2698         OBD_FREE(ctxt, offsetof(typeof(*ctxt), ldc_stripes[stripe_count]));
2699
2700         *ppage = page;
2701
2702         RETURN(0);
2703
2704 free_page:
2705         kunmap(page);
2706         __free_page(page);
2707
2708         return rc;
2709 }
2710
2711 int lmv_read_page(struct obd_export *exp, struct md_op_data *op_data,
2712                   struct md_callback *cb_op, __u64 offset,
2713                   struct page **ppage)
2714 {
2715         struct obd_device *obd = exp->exp_obd;
2716         struct lmv_obd *lmv = &obd->u.lmv;
2717         struct lmv_tgt_desc *tgt;
2718         int rc;
2719
2720         ENTRY;
2721
2722         if (unlikely(lmv_dir_foreign(op_data->op_mea1)))
2723                 RETURN(-ENODATA);
2724
2725         if (unlikely(lmv_dir_striped(op_data->op_mea1))) {
2726                 rc = lmv_striped_read_page(exp, op_data, cb_op, offset, ppage);
2727                 RETURN(rc);
2728         }
2729
2730         tgt = lmv_fid2tgt(lmv, &op_data->op_fid1);
2731         if (IS_ERR(tgt))
2732                 RETURN(PTR_ERR(tgt));
2733
2734         rc = md_read_page(tgt->ltd_exp, op_data, cb_op, offset, ppage);
2735
2736         RETURN(rc);
2737 }
2738
2739 /**
2740  * Unlink a file/directory
2741  *
2742  * Unlink a file or directory under the parent dir. The unlink request
2743  * usually will be sent to the MDT where the child is located, but if
2744  * the client does not have the child FID then request will be sent to the
2745  * MDT where the parent is located.
2746  *
2747  * If the parent is a striped directory then it also needs to locate which
2748  * stripe the name of the child is located, and replace the parent FID
2749  * (@op->op_fid1) with the stripe FID. Note: if the stripe is unknown,
2750  * it will walk through all of sub-stripes until the child is being
2751  * unlinked finally.
2752  *
2753  * \param[in] exp       export refer to LMV
2754  * \param[in] op_data   different parameters transferred beween client
2755  *                      MD stacks, name, namelen, FIDs etc.
2756  *                      op_fid1 is the parent FID, op_fid2 is the child
2757  *                      FID.
2758  * \param[out] request  point to the request of unlink.
2759  *
2760  * retval               0 if succeed
2761  *                      negative errno if failed.
2762  */
2763 static int lmv_unlink(struct obd_export *exp, struct md_op_data *op_data,
2764                       struct ptlrpc_request **request)
2765 {
2766         struct obd_device *obd = exp->exp_obd;
2767         struct lmv_obd *lmv = &obd->u.lmv;
2768         struct lmv_tgt_desc *tgt;
2769         struct lmv_tgt_desc *parent_tgt;
2770         struct mdt_body *body;
2771         int rc;
2772
2773         ENTRY;
2774
2775         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2776         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2777         op_data->op_cap = cfs_curproc_cap_pack();
2778
2779 retry:
2780         parent_tgt = lmv_locate_tgt(lmv, op_data);
2781         if (IS_ERR(parent_tgt))
2782                 RETURN(PTR_ERR(parent_tgt));
2783
2784         if (likely(!fid_is_zero(&op_data->op_fid2))) {
2785                 tgt = lmv_fid2tgt(lmv, &op_data->op_fid2);
2786                 if (IS_ERR(tgt))
2787                         RETURN(PTR_ERR(tgt));
2788         } else {
2789                 tgt = parent_tgt;
2790         }
2791
2792         /*
2793          * If child's fid is given, cancel unused locks for it if it is from
2794          * another export than parent.
2795          *
2796          * LOOKUP lock for child (fid3) should also be cancelled on parent
2797          * tgt_tgt in mdc_unlink().
2798          */
2799         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2800
2801         if (parent_tgt != tgt)
2802                 rc = lmv_early_cancel(exp, parent_tgt, op_data, tgt->ltd_index,
2803                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2804                                       MF_MDC_CANCEL_FID3);
2805
2806         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_index, LCK_EX,
2807                               MDS_INODELOCK_ELC, MF_MDC_CANCEL_FID3);
2808         if (rc)
2809                 RETURN(rc);
2810
2811         CDEBUG(D_INODE, "unlink with fid="DFID"/"DFID" -> mds #%u\n",
2812                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2),
2813                tgt->ltd_index);
2814
2815         rc = md_unlink(tgt->ltd_exp, op_data, request);
2816         if (rc == -ENOENT && lmv_dir_retry_check_update(op_data)) {
2817                 ptlrpc_req_finished(*request);
2818                 *request = NULL;
2819                 goto retry;
2820         }
2821
2822         if (rc != -EREMOTE)
2823                 RETURN(rc);
2824
2825         body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
2826         if (body == NULL)
2827                 RETURN(-EPROTO);
2828
2829         /* Not cross-ref case, just get out of here. */
2830         if (likely(!(body->mbo_valid & OBD_MD_MDS)))
2831                 RETURN(rc);
2832
2833         /* This is a remote object, try remote MDT. */
2834         op_data->op_fid2 = body->mbo_fid1;
2835         ptlrpc_req_finished(*request);
2836         *request = NULL;
2837
2838         tgt = lmv_fid2tgt(lmv, &op_data->op_fid2);
2839         if (IS_ERR(tgt))
2840                 RETURN(PTR_ERR(tgt));
2841
2842         goto retry;
2843 }
2844
2845 static int lmv_precleanup(struct obd_device *obd)
2846 {
2847         ENTRY;
2848         libcfs_kkuc_group_rem(&obd->obd_uuid, 0, KUC_GRP_HSM);
2849         fld_client_debugfs_fini(&obd->u.lmv.lmv_fld);
2850         lprocfs_obd_cleanup(obd);
2851         lprocfs_free_md_stats(obd);
2852         RETURN(0);
2853 }
2854
2855 /**
2856  * Get by key a value associated with a LMV device.
2857  *
2858  * Dispatch request to lower-layer devices as needed.
2859  *
2860  * \param[in] env               execution environment for this thread
2861  * \param[in] exp               export for the LMV device
2862  * \param[in] keylen            length of key identifier
2863  * \param[in] key               identifier of key to get value for
2864  * \param[in] vallen            size of \a val
2865  * \param[out] val              pointer to storage location for value
2866  * \param[in] lsm               optional striping metadata of object
2867  *
2868  * \retval 0            on success
2869  * \retval negative     negated errno on failure
2870  */
2871 static int lmv_get_info(const struct lu_env *env, struct obd_export *exp,
2872                         __u32 keylen, void *key, __u32 *vallen, void *val)
2873 {
2874         struct obd_device *obd;
2875         struct lmv_obd *lmv;
2876         struct lu_tgt_desc *tgt;
2877         int rc = 0;
2878
2879         ENTRY;
2880
2881         obd = class_exp2obd(exp);
2882         if (obd == NULL) {
2883                 CDEBUG(D_IOCTL, "Invalid client cookie %#llx\n",
2884                        exp->exp_handle.h_cookie);
2885                 RETURN(-EINVAL);
2886         }
2887
2888         lmv = &obd->u.lmv;
2889         if (keylen >= strlen("remote_flag") && !strcmp(key, "remote_flag")) {
2890                 LASSERT(*vallen == sizeof(__u32));
2891                 lmv_foreach_connected_tgt(lmv, tgt) {
2892                         if (!obd_get_info(env, tgt->ltd_exp, keylen, key,
2893                                           vallen, val))
2894                                 RETURN(0);
2895                 }
2896                 RETURN(-EINVAL);
2897         } else if (KEY_IS(KEY_MAX_EASIZE) ||
2898                    KEY_IS(KEY_DEFAULT_EASIZE) ||
2899                    KEY_IS(KEY_CONN_DATA)) {
2900                 /*
2901                  * Forwarding this request to first MDS, it should know LOV
2902                  * desc.
2903                  */
2904                 tgt = lmv_tgt(lmv, 0);
2905                 if (!tgt)
2906                         RETURN(-ENODEV);
2907
2908                 rc = obd_get_info(env, tgt->ltd_exp, keylen, key, vallen, val);
2909                 if (!rc && KEY_IS(KEY_CONN_DATA))
2910                         exp->exp_connect_data = *(struct obd_connect_data *)val;
2911                 RETURN(rc);
2912         } else if (KEY_IS(KEY_TGT_COUNT)) {
2913                 *((int *)val) = lmv->lmv_mdt_descs.ltd_lmv_desc.ld_tgt_count;
2914                 RETURN(0);
2915         }
2916
2917         CDEBUG(D_IOCTL, "Invalid key\n");
2918         RETURN(-EINVAL);
2919 }
2920
2921 static int lmv_rmfid(struct obd_export *exp, struct fid_array *fa,
2922                      int *__rcs, struct ptlrpc_request_set *_set)
2923 {
2924         struct obd_device *obd = class_exp2obd(exp);
2925         struct ptlrpc_request_set *set = _set;
2926         struct lmv_obd *lmv = &obd->u.lmv;
2927         int tgt_count = lmv->lmv_mdt_count;
2928         struct lu_tgt_desc *tgt;
2929         struct fid_array *fat, **fas = NULL;
2930         int i, rc, **rcs = NULL;
2931
2932         if (!set) {
2933                 set = ptlrpc_prep_set();
2934                 if (!set)
2935                         RETURN(-ENOMEM);
2936         }
2937
2938         /* split FIDs by targets */
2939         OBD_ALLOC(fas, sizeof(fas) * tgt_count);
2940         if (fas == NULL)
2941                 GOTO(out, rc = -ENOMEM);
2942         OBD_ALLOC(rcs, sizeof(int *) * tgt_count);
2943         if (rcs == NULL)
2944                 GOTO(out_fas, rc = -ENOMEM);
2945
2946         for (i = 0; i < fa->fa_nr; i++) {
2947                 unsigned int idx;
2948
2949                 rc = lmv_fld_lookup(lmv, &fa->fa_fids[i], &idx);
2950                 if (rc) {
2951                         CDEBUG(D_OTHER, "can't lookup "DFID": rc = %d\n",
2952                                PFID(&fa->fa_fids[i]), rc);
2953                         continue;
2954                 }
2955                 LASSERT(idx < tgt_count);
2956                 if (!fas[idx])
2957                         OBD_ALLOC(fas[idx], offsetof(struct fid_array,
2958                                   fa_fids[fa->fa_nr]));
2959                 if (!fas[idx])
2960                         GOTO(out, rc = -ENOMEM);
2961                 if (!rcs[idx])
2962                         OBD_ALLOC(rcs[idx], sizeof(int) * fa->fa_nr);
2963                 if (!rcs[idx])
2964                         GOTO(out, rc = -ENOMEM);
2965
2966                 fat = fas[idx];
2967                 fat->fa_fids[fat->fa_nr++] = fa->fa_fids[i];
2968         }
2969
2970         lmv_foreach_connected_tgt(lmv, tgt) {
2971                 fat = fas[tgt->ltd_index];
2972                 if (!fat || fat->fa_nr == 0)
2973                         continue;
2974                 rc = md_rmfid(tgt->ltd_exp, fat, rcs[tgt->ltd_index], set);
2975         }
2976
2977         rc = ptlrpc_set_wait(NULL, set);
2978         if (rc == 0) {
2979                 int j = 0;
2980                 for (i = 0; i < tgt_count; i++) {
2981                         fat = fas[i];
2982                         if (!fat || fat->fa_nr == 0)
2983                                 continue;
2984                         /* copy FIDs back */
2985                         memcpy(fa->fa_fids + j, fat->fa_fids,
2986                                fat->fa_nr * sizeof(struct lu_fid));
2987                         /* copy rcs back */
2988                         memcpy(__rcs + j, rcs[i], fat->fa_nr * sizeof(**rcs));
2989                         j += fat->fa_nr;
2990                 }
2991         }
2992         if (set != _set)
2993                 ptlrpc_set_destroy(set);
2994
2995 out:
2996         for (i = 0; i < tgt_count; i++) {
2997                 if (fas && fas[i])
2998                         OBD_FREE(fas[i], offsetof(struct fid_array,
2999                                                 fa_fids[fa->fa_nr]));
3000                 if (rcs && rcs[i])
3001                         OBD_FREE(rcs[i], sizeof(int) * fa->fa_nr);
3002         }
3003         if (rcs)
3004                 OBD_FREE(rcs, sizeof(int *) * tgt_count);
3005 out_fas:
3006         if (fas)
3007                 OBD_FREE(fas, sizeof(fas) * tgt_count);
3008
3009         RETURN(rc);
3010 }
3011
3012 /**
3013  * Asynchronously set by key a value associated with a LMV device.
3014  *
3015  * Dispatch request to lower-layer devices as needed.
3016  *
3017  * \param[in] env       execution environment for this thread
3018  * \param[in] exp       export for the LMV device
3019  * \param[in] keylen    length of key identifier
3020  * \param[in] key       identifier of key to store value for
3021  * \param[in] vallen    size of value to store
3022  * \param[in] val       pointer to data to be stored
3023  * \param[in] set       optional list of related ptlrpc requests
3024  *
3025  * \retval 0            on success
3026  * \retval negative     negated errno on failure
3027  */
3028 int lmv_set_info_async(const struct lu_env *env, struct obd_export *exp,
3029                         __u32 keylen, void *key, __u32 vallen, void *val,
3030                         struct ptlrpc_request_set *set)
3031 {
3032         struct lmv_tgt_desc     *tgt = NULL;
3033         struct obd_device       *obd;
3034         struct lmv_obd          *lmv;
3035         int rc = 0;
3036         ENTRY;
3037
3038         obd = class_exp2obd(exp);
3039         if (obd == NULL) {
3040                 CDEBUG(D_IOCTL, "Invalid client cookie %#llx\n",
3041                        exp->exp_handle.h_cookie);
3042                 RETURN(-EINVAL);
3043         }
3044         lmv = &obd->u.lmv;
3045
3046         if (KEY_IS(KEY_READ_ONLY) || KEY_IS(KEY_FLUSH_CTX) ||
3047             KEY_IS(KEY_DEFAULT_EASIZE)) {
3048                 int err = 0;
3049
3050                 lmv_foreach_connected_tgt(lmv, tgt) {
3051                         err = obd_set_info_async(env, tgt->ltd_exp,
3052                                                  keylen, key, vallen, val, set);
3053                         if (err && rc == 0)
3054                                 rc = err;
3055                 }
3056
3057                 RETURN(rc);
3058         }
3059
3060         RETURN(-EINVAL);
3061 }
3062
3063 static int lmv_unpack_md_v1(struct obd_export *exp, struct lmv_stripe_md *lsm,
3064                             const struct lmv_mds_md_v1 *lmm1)
3065 {
3066         struct lmv_obd  *lmv = &exp->exp_obd->u.lmv;
3067         int             stripe_count;
3068         int             cplen;
3069         int             i;
3070         int             rc = 0;
3071         ENTRY;
3072
3073         lsm->lsm_md_magic = le32_to_cpu(lmm1->lmv_magic);
3074         lsm->lsm_md_stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
3075         lsm->lsm_md_master_mdt_index = le32_to_cpu(lmm1->lmv_master_mdt_index);
3076         if (OBD_FAIL_CHECK(OBD_FAIL_UNKNOWN_LMV_STRIPE))
3077                 lsm->lsm_md_hash_type = LMV_HASH_TYPE_UNKNOWN;
3078         else
3079                 lsm->lsm_md_hash_type = le32_to_cpu(lmm1->lmv_hash_type);
3080         lsm->lsm_md_layout_version = le32_to_cpu(lmm1->lmv_layout_version);
3081         lsm->lsm_md_migrate_offset = le32_to_cpu(lmm1->lmv_migrate_offset);
3082         lsm->lsm_md_migrate_hash = le32_to_cpu(lmm1->lmv_migrate_hash);
3083         cplen = strlcpy(lsm->lsm_md_pool_name, lmm1->lmv_pool_name,
3084                         sizeof(lsm->lsm_md_pool_name));
3085
3086         if (cplen >= sizeof(lsm->lsm_md_pool_name))
3087                 RETURN(-E2BIG);
3088
3089         CDEBUG(D_INFO, "unpack lsm count %d/%d, master %d hash_type %#x/%#x "
3090                "layout_version %d\n", lsm->lsm_md_stripe_count,
3091                lsm->lsm_md_migrate_offset, lsm->lsm_md_master_mdt_index,
3092                lsm->lsm_md_hash_type, lsm->lsm_md_migrate_hash,
3093                lsm->lsm_md_layout_version);
3094
3095         stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
3096         for (i = 0; i < stripe_count; i++) {
3097                 fid_le_to_cpu(&lsm->lsm_md_oinfo[i].lmo_fid,
3098                               &lmm1->lmv_stripe_fids[i]);
3099                 /*
3100                  * set default value -1, so lmv_locate_tgt() knows this stripe
3101                  * target is not initialized.
3102                  */
3103                 lsm->lsm_md_oinfo[i].lmo_mds = LMV_OFFSET_DEFAULT;
3104                 if (!fid_is_sane(&lsm->lsm_md_oinfo[i].lmo_fid))
3105                         continue;
3106
3107                 rc = lmv_fld_lookup(lmv, &lsm->lsm_md_oinfo[i].lmo_fid,
3108                                     &lsm->lsm_md_oinfo[i].lmo_mds);
3109                 if (rc == -ENOENT)
3110                         continue;
3111
3112                 if (rc)
3113                         RETURN(rc);
3114
3115                 CDEBUG(D_INFO, "unpack fid #%d "DFID"\n", i,
3116                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid));
3117         }
3118
3119         RETURN(rc);
3120 }
3121
3122 static inline int lmv_unpack_user_md(struct obd_export *exp,
3123                                      struct lmv_stripe_md *lsm,
3124                                      const struct lmv_user_md *lmu)
3125 {
3126         lsm->lsm_md_magic = le32_to_cpu(lmu->lum_magic);
3127         lsm->lsm_md_stripe_count = le32_to_cpu(lmu->lum_stripe_count);
3128         lsm->lsm_md_master_mdt_index = le32_to_cpu(lmu->lum_stripe_offset);
3129         lsm->lsm_md_hash_type = le32_to_cpu(lmu->lum_hash_type);
3130         lsm->lsm_md_pool_name[LOV_MAXPOOLNAME] = 0;
3131
3132         return 0;
3133 }
3134
3135 static int lmv_unpackmd(struct obd_export *exp, struct lmv_stripe_md **lsmp,
3136                         const union lmv_mds_md *lmm, size_t lmm_size)
3137 {
3138         struct lmv_stripe_md     *lsm;
3139         int                      lsm_size;
3140         int                      rc;
3141         bool                     allocated = false;
3142         ENTRY;
3143
3144         LASSERT(lsmp != NULL);
3145
3146         lsm = *lsmp;
3147         /* Free memmd */
3148         if (lsm != NULL && lmm == NULL) {
3149                 int i;
3150                 struct lmv_foreign_md *lfm = (struct lmv_foreign_md *)lsm;
3151
3152                 if (lfm->lfm_magic == LMV_MAGIC_FOREIGN) {
3153                         size_t lfm_size;
3154
3155                         lfm_size = lfm->lfm_length + offsetof(typeof(*lfm),
3156                                                               lfm_value[0]);
3157                         OBD_FREE_LARGE(lfm, lfm_size);
3158                         RETURN(0);
3159                 }
3160
3161                 if (lmv_dir_striped(lsm)) {
3162                         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
3163                                 if (lsm->lsm_md_oinfo[i].lmo_root)
3164                                         iput(lsm->lsm_md_oinfo[i].lmo_root);
3165                         }
3166                         lsm_size = lmv_stripe_md_size(lsm->lsm_md_stripe_count);
3167                 } else {
3168                         lsm_size = lmv_stripe_md_size(0);
3169                 }
3170                 OBD_FREE(lsm, lsm_size);
3171                 *lsmp = NULL;
3172                 RETURN(0);
3173         }
3174
3175         /* foreign lmv case */
3176         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_FOREIGN) {
3177                 struct lmv_foreign_md *lfm = (struct lmv_foreign_md *)lsm;
3178
3179                 if (lfm == NULL) {
3180                         OBD_ALLOC_LARGE(lfm, lmm_size);
3181                         if (lfm == NULL)
3182                                 RETURN(-ENOMEM);
3183                         *lsmp = (struct lmv_stripe_md *)lfm;
3184                 }
3185                 lfm->lfm_magic = le32_to_cpu(lmm->lmv_foreign_md.lfm_magic);
3186                 lfm->lfm_length = le32_to_cpu(lmm->lmv_foreign_md.lfm_length);
3187                 lfm->lfm_type = le32_to_cpu(lmm->lmv_foreign_md.lfm_type);
3188                 lfm->lfm_flags = le32_to_cpu(lmm->lmv_foreign_md.lfm_flags);
3189                 memcpy(&lfm->lfm_value, &lmm->lmv_foreign_md.lfm_value,
3190                        lfm->lfm_length);
3191                 RETURN(lmm_size);
3192         }
3193
3194         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE)
3195                 RETURN(-EPERM);
3196
3197         /* Unpack memmd */
3198         if (le32_to_cpu(lmm->lmv_magic) != LMV_MAGIC_V1 &&
3199             le32_to_cpu(lmm->lmv_magic) != LMV_USER_MAGIC) {
3200                 CERROR("%s: invalid lmv magic %x: rc = %d\n",
3201                        exp->exp_obd->obd_name, le32_to_cpu(lmm->lmv_magic),
3202                        -EIO);
3203                 RETURN(-EIO);
3204         }
3205
3206         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_V1)
3207                 lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
3208         else
3209                 /**
3210                  * Unpack default dirstripe(lmv_user_md) to lmv_stripe_md,
3211                  * stripecount should be 0 then.
3212                  */
3213                 lsm_size = lmv_stripe_md_size(0);
3214
3215         if (lsm == NULL) {
3216                 OBD_ALLOC(lsm, lsm_size);
3217                 if (lsm == NULL)
3218                         RETURN(-ENOMEM);
3219                 allocated = true;
3220                 *lsmp = lsm;
3221         }
3222
3223         switch (le32_to_cpu(lmm->lmv_magic)) {
3224         case LMV_MAGIC_V1:
3225                 rc = lmv_unpack_md_v1(exp, lsm, &lmm->lmv_md_v1);
3226                 break;
3227         case LMV_USER_MAGIC:
3228                 rc = lmv_unpack_user_md(exp, lsm, &lmm->lmv_user_md);
3229                 break;
3230         default:
3231                 CERROR("%s: unrecognized magic %x\n", exp->exp_obd->obd_name,
3232                        le32_to_cpu(lmm->lmv_magic));
3233                 rc = -EINVAL;
3234                 break;
3235         }
3236
3237         if (rc != 0 && allocated) {
3238                 OBD_FREE(lsm, lsm_size);
3239                 *lsmp = NULL;
3240                 lsm_size = rc;
3241         }
3242         RETURN(lsm_size);
3243 }
3244
3245 void lmv_free_memmd(struct lmv_stripe_md *lsm)
3246 {
3247         lmv_unpackmd(NULL, &lsm, NULL, 0);
3248 }
3249 EXPORT_SYMBOL(lmv_free_memmd);
3250
3251 static int lmv_cancel_unused(struct obd_export *exp, const struct lu_fid *fid,
3252                              union ldlm_policy_data *policy,
3253                              enum ldlm_mode mode, enum ldlm_cancel_flags flags,
3254                              void *opaque)
3255 {
3256         struct lmv_obd *lmv = &exp->exp_obd->u.lmv;
3257         struct lu_tgt_desc *tgt;
3258         int err;
3259         int rc = 0;
3260
3261         ENTRY;
3262
3263         LASSERT(fid != NULL);
3264
3265         lmv_foreach_connected_tgt(lmv, tgt) {
3266                 if (!tgt->ltd_active)
3267                         continue;
3268
3269                 err = md_cancel_unused(tgt->ltd_exp, fid, policy, mode, flags,
3270                                        opaque);
3271                 if (!rc)
3272                         rc = err;
3273         }
3274         RETURN(rc);
3275 }
3276
3277 static int lmv_set_lock_data(struct obd_export *exp,
3278                              const struct lustre_handle *lockh,
3279                              void *data, __u64 *bits)
3280 {
3281         struct lmv_obd *lmv = &exp->exp_obd->u.lmv;
3282         struct lmv_tgt_desc *tgt = lmv_tgt(lmv, 0);
3283         int rc;
3284
3285         ENTRY;
3286
3287         if (tgt == NULL || tgt->ltd_exp == NULL)
3288                 RETURN(-EINVAL);
3289         rc =  md_set_lock_data(tgt->ltd_exp, lockh, data, bits);
3290         RETURN(rc);
3291 }
3292
3293 enum ldlm_mode lmv_lock_match(struct obd_export *exp, __u64 flags,
3294                               const struct lu_fid *fid, enum ldlm_type type,
3295                               union ldlm_policy_data *policy,
3296                               enum ldlm_mode mode, struct lustre_handle *lockh)
3297 {
3298         struct obd_device *obd = exp->exp_obd;
3299         struct lmv_obd *lmv = &obd->u.lmv;
3300         enum ldlm_mode rc;
3301         struct lu_tgt_desc *tgt;
3302         int i;
3303         int index;
3304
3305         ENTRY;
3306
3307         CDEBUG(D_INODE, "Lock match for "DFID"\n", PFID(fid));
3308
3309         /*
3310          * With DNE every object can have two locks in different namespaces:
3311          * lookup lock in space of MDT storing direntry and update/open lock in
3312          * space of MDT storing inode.  Try the MDT that the FID maps to first,
3313          * since this can be easily found, and only try others if that fails.
3314          */
3315         for (i = 0, index = lmv_fid2tgt_index(lmv, fid);
3316              i < lmv->lmv_mdt_descs.ltd_tgts_size;
3317              i++, index = (index + 1) % lmv->lmv_mdt_descs.ltd_tgts_size) {
3318                 if (index < 0) {
3319                         CDEBUG(D_HA, "%s: "DFID" is inaccessible: rc = %d\n",
3320                                obd->obd_name, PFID(fid), index);
3321                         index = 0;
3322                 }
3323
3324                 tgt = lmv_tgt(lmv, index);
3325                 if (!tgt || !tgt->ltd_exp || !tgt->ltd_active)
3326                         continue;
3327
3328                 rc = md_lock_match(tgt->ltd_exp, flags, fid, type, policy, mode,
3329                                    lockh);
3330                 if (rc)
3331                         RETURN(rc);
3332         }
3333
3334         RETURN(0);
3335 }
3336
3337 int lmv_get_lustre_md(struct obd_export *exp, struct ptlrpc_request *req,
3338                       struct obd_export *dt_exp, struct obd_export *md_exp,
3339                       struct lustre_md *md)
3340 {
3341         struct lmv_obd *lmv = &exp->exp_obd->u.lmv;
3342         struct lmv_tgt_desc *tgt = lmv_tgt(lmv, 0);
3343
3344         if (!tgt || !tgt->ltd_exp)
3345                 return -EINVAL;
3346
3347         return md_get_lustre_md(tgt->ltd_exp, req, dt_exp, md_exp, md);
3348 }
3349
3350 int lmv_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
3351 {
3352         struct obd_device *obd = exp->exp_obd;
3353         struct lmv_obd *lmv = &obd->u.lmv;
3354         struct lmv_tgt_desc *tgt = lmv_tgt(lmv, 0);
3355
3356         ENTRY;
3357
3358         if (md->default_lmv) {
3359                 lmv_free_memmd(md->default_lmv);
3360                 md->default_lmv = NULL;
3361         }
3362         if (md->lmv != NULL) {
3363                 lmv_free_memmd(md->lmv);
3364                 md->lmv = NULL;
3365         }
3366         if (!tgt || !tgt->ltd_exp)
3367                 RETURN(-EINVAL);
3368         RETURN(md_free_lustre_md(tgt->ltd_exp, md));
3369 }
3370
3371 int lmv_set_open_replay_data(struct obd_export *exp,
3372                              struct obd_client_handle *och,
3373                              struct lookup_intent *it)
3374 {
3375         struct obd_device *obd = exp->exp_obd;
3376         struct lmv_obd *lmv = &obd->u.lmv;
3377         struct lmv_tgt_desc *tgt;
3378
3379         ENTRY;
3380
3381         tgt = lmv_fid2tgt(lmv, &och->och_fid);
3382         if (IS_ERR(tgt))
3383                 RETURN(PTR_ERR(tgt));
3384
3385         RETURN(md_set_open_replay_data(tgt->ltd_exp, och, it));
3386 }
3387
3388 int lmv_clear_open_replay_data(struct obd_export *exp,
3389                                struct obd_client_handle *och)
3390 {
3391         struct obd_device *obd = exp->exp_obd;
3392         struct lmv_obd *lmv = &obd->u.lmv;
3393         struct lmv_tgt_desc *tgt;
3394
3395         ENTRY;
3396
3397         tgt = lmv_fid2tgt(lmv, &och->och_fid);
3398         if (IS_ERR(tgt))
3399                 RETURN(PTR_ERR(tgt));
3400
3401         RETURN(md_clear_open_replay_data(tgt->ltd_exp, och));
3402 }
3403
3404 int lmv_intent_getattr_async(struct obd_export *exp,
3405                              struct md_enqueue_info *minfo)
3406 {
3407         struct md_op_data *op_data = &minfo->mi_data;
3408         struct obd_device *obd = exp->exp_obd;
3409         struct lmv_obd *lmv = &obd->u.lmv;
3410         struct lmv_tgt_desc *ptgt;
3411         struct lmv_tgt_desc *ctgt;
3412         int rc;
3413
3414         ENTRY;
3415
3416         if (!fid_is_sane(&op_data->op_fid2))
3417                 RETURN(-EINVAL);
3418
3419         ptgt = lmv_locate_tgt(lmv, op_data);
3420         if (IS_ERR(ptgt))
3421                 RETURN(PTR_ERR(ptgt));
3422
3423         ctgt = lmv_fid2tgt(lmv, &op_data->op_fid2);
3424         if (IS_ERR(ctgt))
3425                 RETURN(PTR_ERR(ctgt));
3426
3427         /*
3428          * remote object needs two RPCs to lookup and getattr, considering the
3429          * complexity don't support statahead for now.
3430          */
3431         if (ctgt != ptgt)
3432                 RETURN(-EREMOTE);
3433
3434         rc = md_intent_getattr_async(ptgt->ltd_exp, minfo);
3435
3436         RETURN(rc);
3437 }
3438
3439 int lmv_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
3440                         struct lu_fid *fid, __u64 *bits)
3441 {
3442         struct obd_device *obd = exp->exp_obd;
3443         struct lmv_obd *lmv = &obd->u.lmv;
3444         struct lmv_tgt_desc *tgt;
3445         int rc;
3446
3447         ENTRY;
3448
3449         tgt = lmv_fid2tgt(lmv, fid);
3450         if (IS_ERR(tgt))
3451                 RETURN(PTR_ERR(tgt));
3452
3453         rc = md_revalidate_lock(tgt->ltd_exp, it, fid, bits);
3454         RETURN(rc);
3455 }
3456
3457 int lmv_get_fid_from_lsm(struct obd_export *exp,
3458                          const struct lmv_stripe_md *lsm,
3459                          const char *name, int namelen, struct lu_fid *fid)
3460 {
3461         const struct lmv_oinfo *oinfo;
3462
3463         LASSERT(lmv_dir_striped(lsm));
3464
3465         oinfo = lsm_name_to_stripe_info(lsm, name, namelen, false);
3466         if (IS_ERR(oinfo))
3467                 return PTR_ERR(oinfo);
3468
3469         *fid = oinfo->lmo_fid;
3470
3471         RETURN(0);
3472 }
3473
3474 /**
3475  * For lmv, only need to send request to master MDT, and the master MDT will
3476  * process with other slave MDTs. The only exception is Q_GETOQUOTA for which
3477  * we directly fetch data from the slave MDTs.
3478  */
3479 int lmv_quotactl(struct obd_device *unused, struct obd_export *exp,
3480                  struct obd_quotactl *oqctl)
3481 {
3482         struct obd_device *obd = class_exp2obd(exp);
3483         struct lmv_obd *lmv = &obd->u.lmv;
3484         struct lmv_tgt_desc *tgt = lmv_tgt(lmv, 0);
3485         __u64 curspace, curinodes;
3486         int rc = 0;
3487
3488         ENTRY;
3489
3490         if (!tgt || !tgt->ltd_exp || !tgt->ltd_active) {
3491                 CERROR("master lmv inactive\n");
3492                 RETURN(-EIO);
3493         }
3494
3495         if (oqctl->qc_cmd != Q_GETOQUOTA) {
3496                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
3497                 RETURN(rc);
3498         }
3499
3500         curspace = curinodes = 0;
3501         lmv_foreach_connected_tgt(lmv, tgt) {
3502                 int err;
3503
3504                 if (!tgt->ltd_active)
3505                         continue;
3506
3507                 err = obd_quotactl(tgt->ltd_exp, oqctl);
3508                 if (err) {
3509                         CERROR("getquota on mdt %d failed. %d\n",
3510                                tgt->ltd_index, err);
3511                         if (!rc)
3512                                 rc = err;
3513                 } else {
3514                         curspace += oqctl->qc_dqblk.dqb_curspace;
3515                         curinodes += oqctl->qc_dqblk.dqb_curinodes;
3516                 }
3517         }
3518         oqctl->qc_dqblk.dqb_curspace = curspace;
3519         oqctl->qc_dqblk.dqb_curinodes = curinodes;
3520
3521         RETURN(rc);
3522 }
3523
3524 static int lmv_merge_attr(struct obd_export *exp,
3525                           const struct lmv_stripe_md *lsm,
3526                           struct cl_attr *attr,
3527                           ldlm_blocking_callback cb_blocking)
3528 {
3529         int rc;
3530         int i;
3531
3532         if (!lmv_dir_striped(lsm))
3533                 return 0;
3534
3535         rc = lmv_revalidate_slaves(exp, lsm, cb_blocking, 0);
3536         if (rc < 0)
3537                 return rc;
3538
3539         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
3540                 struct inode *inode = lsm->lsm_md_oinfo[i].lmo_root;
3541
3542                 if (!inode)
3543                         continue;
3544
3545                 CDEBUG(D_INFO,
3546                        "" DFID " size %llu, blocks %llu nlink %u, atime %lld ctime %lld, mtime %lld.\n",
3547                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid),
3548                        i_size_read(inode), (unsigned long long)inode->i_blocks,
3549                        inode->i_nlink, (s64)inode->i_atime.tv_sec,
3550                        (s64)inode->i_ctime.tv_sec, (s64)inode->i_mtime.tv_sec);
3551
3552                 /* for slave stripe, it needs to subtract nlink for . and .. */
3553                 if (i != 0)
3554                         attr->cat_nlink += inode->i_nlink - 2;
3555                 else
3556                         attr->cat_nlink = inode->i_nlink;
3557
3558                 attr->cat_size += i_size_read(inode);
3559                 attr->cat_blocks += inode->i_blocks;
3560
3561                 if (attr->cat_atime < inode->i_atime.tv_sec)
3562                         attr->cat_atime = inode->i_atime.tv_sec;
3563
3564                 if (attr->cat_ctime < inode->i_ctime.tv_sec)
3565                         attr->cat_ctime = inode->i_ctime.tv_sec;
3566
3567                 if (attr->cat_mtime < inode->i_mtime.tv_sec)
3568                         attr->cat_mtime = inode->i_mtime.tv_sec;
3569         }
3570         return 0;
3571 }
3572
3573 static const struct obd_ops lmv_obd_ops = {
3574         .o_owner                = THIS_MODULE,
3575         .o_setup                = lmv_setup,
3576         .o_cleanup              = lmv_cleanup,
3577         .o_precleanup           = lmv_precleanup,
3578         .o_process_config       = lmv_process_config,
3579         .o_connect              = lmv_connect,
3580         .o_disconnect           = lmv_disconnect,
3581         .o_statfs               = lmv_statfs,
3582         .o_get_info             = lmv_get_info,
3583         .o_set_info_async       = lmv_set_info_async,
3584         .o_notify               = lmv_notify,
3585         .o_get_uuid             = lmv_get_uuid,
3586         .o_fid_alloc            = lmv_fid_alloc,
3587         .o_iocontrol            = lmv_iocontrol,
3588         .o_quotactl             = lmv_quotactl
3589 };
3590
3591 static const struct md_ops lmv_md_ops = {
3592         .m_get_root             = lmv_get_root,
3593         .m_null_inode           = lmv_null_inode,
3594         .m_close                = lmv_close,
3595         .m_create               = lmv_create,
3596         .m_enqueue              = lmv_enqueue,
3597         .m_getattr              = lmv_getattr,
3598         .m_getxattr             = lmv_getxattr,
3599         .m_getattr_name         = lmv_getattr_name,
3600         .m_intent_lock          = lmv_intent_lock,
3601         .m_link                 = lmv_link,
3602         .m_rename               = lmv_rename,
3603         .m_setattr              = lmv_setattr,
3604         .m_setxattr             = lmv_setxattr,
3605         .m_fsync                = lmv_fsync,
3606         .m_file_resync          = lmv_file_resync,
3607         .m_read_page            = lmv_read_page,
3608         .m_unlink               = lmv_unlink,
3609         .m_init_ea_size         = lmv_init_ea_size,
3610         .m_cancel_unused        = lmv_cancel_unused,
3611         .m_set_lock_data        = lmv_set_lock_data,
3612         .m_lock_match           = lmv_lock_match,
3613         .m_get_lustre_md        = lmv_get_lustre_md,
3614         .m_free_lustre_md       = lmv_free_lustre_md,
3615         .m_merge_attr           = lmv_merge_attr,
3616         .m_set_open_replay_data = lmv_set_open_replay_data,
3617         .m_clear_open_replay_data = lmv_clear_open_replay_data,
3618         .m_intent_getattr_async = lmv_intent_getattr_async,
3619         .m_revalidate_lock      = lmv_revalidate_lock,
3620         .m_get_fid_from_lsm     = lmv_get_fid_from_lsm,
3621         .m_unpackmd             = lmv_unpackmd,
3622         .m_rmfid                = lmv_rmfid,
3623 };
3624
3625 static int __init lmv_init(void)
3626 {
3627         return class_register_type(&lmv_obd_ops, &lmv_md_ops, true, NULL,
3628                                    LUSTRE_LMV_NAME, NULL);
3629 }
3630
3631 static void __exit lmv_exit(void)
3632 {
3633         class_unregister_type(LUSTRE_LMV_NAME);
3634 }
3635
3636 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
3637 MODULE_DESCRIPTION("Lustre Logical Metadata Volume");
3638 MODULE_VERSION(LUSTRE_VERSION_STRING);
3639 MODULE_LICENSE("GPL");
3640
3641 module_init(lmv_init);
3642 module_exit(lmv_exit);