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, 2016, 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 #include <linux/slab.h>
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/user_namespace.h>
  38 #ifdef HAVE_UIDGID_HEADER
  39 # include <linux/uidgid.h>
  40 #endif
  41 #include <linux/slab.h>
  42 #include <linux/pagemap.h>
  43 #include <linux/mm.h>
  44 #include <linux/math64.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/namei.h>
  47
  48 #include <lustre/lustre_idl.h>
  49 #include <obd_support.h>
  50 #include <lustre_lib.h>
  51 #include <lustre_net.h>
  52 #include <obd_class.h>
  53 #include <lustre_lmv.h>
  54 #include <lprocfs_status.h>
  55 #include <cl_object.h>
  56 #include <lustre_fid.h>
  57 #include <lustre_ioctl.h>
  58 #include <lustre_kernelcomm.h>
  59 #include "lmv_internal.h"
  60
  61 static int lmv_check_connect(struct obd_device *obd);
  62
  63 static void lmv_activate_target(struct lmv_obd *lmv,
  64                                 struct lmv_tgt_desc *tgt,
  65                                 int activate)
  66 {
  67         if (tgt->ltd_active == activate)
  68                 return;
  69
  70         tgt->ltd_active = activate;
  71         lmv->desc.ld_active_tgt_count += (activate ? 1 : -1);
  72
  73         tgt->ltd_exp->exp_obd->obd_inactive = !activate;
  74 }
  75
  76 /**
  77  * Error codes:
  78  *
  79  *  -EINVAL  : UUID can't be found in the LMV's target list
  80  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
  81  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
  82  */
  83 static int lmv_set_mdc_active(struct lmv_obd *lmv,
  84                               const struct obd_uuid *uuid,
  85                               int activate)
  86 {
  87         struct lmv_tgt_desc     *tgt = NULL;
  88         struct obd_device       *obd;
  89         __u32                    i;
  90         int                      rc = 0;
  91         ENTRY;
  92
  93         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
  94                         lmv, uuid->uuid, activate);
  95
  96         spin_lock(&lmv->lmv_lock);
  97         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
  98                 tgt = lmv->tgts[i];
  99                 if (tgt == NULL || tgt->ltd_exp == NULL)
 100                         continue;
 101
 102                 CDEBUG(D_INFO, "Target idx %d is %s conn %#llx\n", i,
 103                        tgt->ltd_uuid.uuid, tgt->ltd_exp->exp_handle.h_cookie);
 104
 105                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 106                         break;
 107         }
 108
 109         if (i == lmv->desc.ld_tgt_count)
 110                 GOTO(out_lmv_lock, rc = -EINVAL);
 111
 112         obd = class_exp2obd(tgt->ltd_exp);
 113         if (obd == NULL)
 114                 GOTO(out_lmv_lock, rc = -ENOTCONN);
 115
 116         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
 117                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
 118                obd->obd_type->typ_name, i);
 119         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0);
 120
 121         if (tgt->ltd_active == activate) {
 122                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
 123                        activate ? "" : "in");
 124                 GOTO(out_lmv_lock, rc);
 125         }
 126
 127         CDEBUG(D_INFO, "Marking OBD %p %sactive\n", obd,
 128                activate ? "" : "in");
 129         lmv_activate_target(lmv, tgt, activate);
 130         EXIT;
 131
 132  out_lmv_lock:
 133         spin_unlock(&lmv->lmv_lock);
 134         return rc;
 135 }
 136
 137 struct obd_uuid *lmv_get_uuid(struct obd_export *exp)
 138 {
 139         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
 140         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
 141
 142         return (tgt == NULL) ? NULL : obd_get_uuid(tgt->ltd_exp);
 143 }
 144
 145 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
 146                       enum obd_notify_event ev)
 147 {
 148         struct obd_connect_data *conn_data;
 149         struct lmv_obd          *lmv = &obd->u.lmv;
 150         struct obd_uuid         *uuid;
 151         int                      rc = 0;
 152         ENTRY;
 153
 154         if (strcmp(watched->obd_type->typ_name, LUSTRE_MDC_NAME)) {
 155                 CERROR("unexpected notification of %s %s!\n",
 156                        watched->obd_type->typ_name,
 157                        watched->obd_name);
 158                 RETURN(-EINVAL);
 159         }
 160
 161         uuid = &watched->u.cli.cl_target_uuid;
 162         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE) {
 163                 /*
 164                  * Set MDC as active before notifying the observer, so the
 165                  * observer can use the MDC normally.
 166                  */
 167                 rc = lmv_set_mdc_active(lmv, uuid,
 168                                         ev == OBD_NOTIFY_ACTIVE);
 169                 if (rc) {
 170                         CERROR("%sactivation of %s failed: %d\n",
 171                                ev == OBD_NOTIFY_ACTIVE ? "" : "de",
 172                                uuid->uuid, rc);
 173                         RETURN(rc);
 174                 }
 175         } else if (ev == OBD_NOTIFY_OCD) {
 176                 conn_data = &watched->u.cli.cl_import->imp_connect_data;
 177                 /*
 178                  * XXX: Make sure that ocd_connect_flags from all targets are
 179                  * the same. Otherwise one of MDTs runs wrong version or
 180                  * something like this.  --umka
 181                  */
 182                 obd->obd_self_export->exp_connect_data = *conn_data;
 183         }
 184
 185         /*
 186          * Pass the notification up the chain.
 187          */
 188         if (obd->obd_observer)
 189                 rc = obd_notify(obd->obd_observer, watched, ev);
 190
 191         RETURN(rc);
 192 }
 193
 194 static int lmv_connect(const struct lu_env *env,
 195                        struct obd_export **pexp, struct obd_device *obd,
 196                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 197                        void *localdata)
 198 {
 199         struct lmv_obd *lmv = &obd->u.lmv;
 200         struct lustre_handle conn = { 0 };
 201         struct obd_export *exp;
 202         int rc;
 203         ENTRY;
 204
 205         rc = class_connect(&conn, obd, cluuid);
 206         if (rc) {
 207                 CERROR("class_connection() returned %d\n", rc);
 208                 RETURN(rc);
 209         }
 210
 211         exp = class_conn2export(&conn);
 212
 213         lmv->connected = 0;
 214         lmv->cluuid = *cluuid;
 215         lmv->conn_data = *data;
 216
 217         if (lmv->targets_proc_entry == NULL) {
 218                 lmv->targets_proc_entry = lprocfs_register("target_obds",
 219                                                            obd->obd_proc_entry,
 220                                                            NULL, NULL);
 221                 if (IS_ERR(lmv->targets_proc_entry)) {
 222                         CERROR("%s: cannot register "
 223                                "/proc/fs/lustre/%s/%s/target_obds\n",
 224                                obd->obd_name, obd->obd_type->typ_name,
 225                                obd->obd_name);
 226                         lmv->targets_proc_entry = NULL;
 227                 }
 228         }
 229
 230         rc = lmv_check_connect(obd);
 231         if (rc != 0)
 232                 GOTO(out_proc, rc);
 233
 234         *pexp = exp;
 235
 236         RETURN(rc);
 237
 238 out_proc:
 239         if (lmv->targets_proc_entry != NULL)
 240                 lprocfs_remove(&lmv->targets_proc_entry);
 241
 242         class_disconnect(exp);
 243
 244         return rc;
 245 }
 246
 247 static int lmv_init_ea_size(struct obd_export *exp, __u32 easize,
 248                             __u32 def_easize)
 249 {
 250         struct obd_device       *obd = exp->exp_obd;
 251         struct lmv_obd          *lmv = &obd->u.lmv;
 252         __u32                    i;
 253         int                      rc = 0;
 254         int                      change = 0;
 255         ENTRY;
 256
 257         if (lmv->max_easize < easize) {
 258                 lmv->max_easize = easize;
 259                 change = 1;
 260         }
 261         if (lmv->max_def_easize < def_easize) {
 262                 lmv->max_def_easize = def_easize;
 263                 change = 1;
 264         }
 265
 266         if (change == 0)
 267                 RETURN(0);
 268
 269         if (lmv->connected == 0)
 270                 RETURN(0);
 271
 272         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 273                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 274
 275                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active) {
 276                         CWARN("%s: NULL export for %d\n", obd->obd_name, i);
 277                         continue;
 278                 }
 279
 280                 rc = md_init_ea_size(tgt->ltd_exp, easize, def_easize);
 281                 if (rc) {
 282                         CERROR("%s: obd_init_ea_size() failed on MDT target %d:"
 283                                " rc = %d\n", obd->obd_name, i, rc);
 284                         break;
 285                 }
 286         }
 287         RETURN(rc);
 288 }
 289
 290 #define MAX_STRING_SIZE 128
 291
 292 int lmv_connect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 293 {
 294         struct lmv_obd          *lmv = &obd->u.lmv;
 295         struct obd_uuid         *cluuid = &lmv->cluuid;
 296         struct obd_uuid          lmv_mdc_uuid = { "LMV_MDC_UUID" };
 297         struct obd_device       *mdc_obd;
 298         struct obd_export       *mdc_exp;
 299         struct lu_fld_target     target;
 300         int                      rc;
 301         ENTRY;
 302
 303         mdc_obd = class_find_client_obd(&tgt->ltd_uuid, LUSTRE_MDC_NAME,
 304                                         &obd->obd_uuid);
 305         if (!mdc_obd) {
 306                 CERROR("target %s not attached\n", tgt->ltd_uuid.uuid);
 307                 RETURN(-EINVAL);
 308         }
 309
 310         CDEBUG(D_CONFIG, "connect to %s(%s) - %s, %s FOR %s\n",
 311                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 312                 tgt->ltd_uuid.uuid, obd->obd_uuid.uuid,
 313                 cluuid->uuid);
 314
 315         if (!mdc_obd->obd_set_up) {
 316                 CERROR("target %s is not set up\n", tgt->ltd_uuid.uuid);
 317                 RETURN(-EINVAL);
 318         }
 319
 320         rc = obd_connect(NULL, &mdc_exp, mdc_obd, &lmv_mdc_uuid,
 321                          &lmv->conn_data, NULL);
 322         if (rc) {
 323                 CERROR("target %s connect error %d\n", tgt->ltd_uuid.uuid, rc);
 324                 RETURN(rc);
 325         }
 326
 327         /*
 328          * Init fid sequence client for this mdc and add new fld target.
 329          */
 330         rc = obd_fid_init(mdc_obd, mdc_exp, LUSTRE_SEQ_METADATA);
 331         if (rc)
 332                 RETURN(rc);
 333
 334         target.ft_srv = NULL;
 335         target.ft_exp = mdc_exp;
 336         target.ft_idx = tgt->ltd_idx;
 337
 338         fld_client_add_target(&lmv->lmv_fld, &target);
 339
 340         rc = obd_register_observer(mdc_obd, obd);
 341         if (rc) {
 342                 obd_disconnect(mdc_exp);
 343                 CERROR("target %s register_observer error %d\n",
 344                        tgt->ltd_uuid.uuid, rc);
 345                 RETURN(rc);
 346         }
 347
 348         if (obd->obd_observer) {
 349                 /*
 350                  * Tell the observer about the new target.
 351                  */
 352                 rc = obd_notify(obd->obd_observer, mdc_exp->exp_obd,
 353                                 OBD_NOTIFY_ACTIVE);
 354                 if (rc) {
 355                         obd_disconnect(mdc_exp);
 356                         RETURN(rc);
 357                 }
 358         }
 359
 360         tgt->ltd_active = 1;
 361         tgt->ltd_exp = mdc_exp;
 362         lmv->desc.ld_active_tgt_count++;
 363
 364         md_init_ea_size(tgt->ltd_exp, lmv->max_easize, lmv->max_def_easize);
 365
 366         CDEBUG(D_CONFIG, "Connected to %s(%s) successfully (%d)\n",
 367                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 368                 atomic_read(&obd->obd_refcount));
 369
 370         if (lmv->targets_proc_entry != NULL) {
 371                 struct proc_dir_entry *mdc_symlink;
 372
 373                 LASSERT(mdc_obd->obd_type != NULL);
 374                 LASSERT(mdc_obd->obd_type->typ_name != NULL);
 375                 mdc_symlink = lprocfs_add_symlink(mdc_obd->obd_name,
 376                                                   lmv->targets_proc_entry,
 377                                                   "../../../%s/%s",
 378                                                   mdc_obd->obd_type->typ_name,
 379                                                   mdc_obd->obd_name);
 380                 if (mdc_symlink == NULL) {
 381                         CERROR("cannot register LMV target "
 382                                "/proc/fs/lustre/%s/%s/target_obds/%s\n",
 383                                obd->obd_type->typ_name, obd->obd_name,
 384                                mdc_obd->obd_name);
 385                 }
 386         }
 387         RETURN(0);
 388 }
 389
 390 static void lmv_del_target(struct lmv_obd *lmv, int index)
 391 {
 392         if (lmv->tgts[index] == NULL)
 393                 return;
 394
 395         OBD_FREE_PTR(lmv->tgts[index]);
 396         lmv->tgts[index] = NULL;
 397         return;
 398 }
 399
 400 static int lmv_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 401                            __u32 index, int gen)
 402 {
 403         struct obd_device *mdc_obd;
 404         struct lmv_obd      *lmv = &obd->u.lmv;
 405         struct lmv_tgt_desc *tgt;
 406         int                  orig_tgt_count = 0;
 407         int                  rc = 0;
 408         ENTRY;
 409
 410         CDEBUG(D_CONFIG, "Target uuid: %s. index %d\n", uuidp->uuid, index);
 411         mdc_obd = class_find_client_obd(uuidp, LUSTRE_MDC_NAME,
 412                                         &obd->obd_uuid);
 413         if (!mdc_obd) {
 414                 CERROR("%s: Target %s not attached: rc = %d\n",
 415                        obd->obd_name, uuidp->uuid, -EINVAL);
 416                 RETURN(-EINVAL);
 417         }
 418
 419         mutex_lock(&lmv->lmv_init_mutex);
 420         if ((index < lmv->tgts_size) && (lmv->tgts[index] != NULL)) {
 421                 tgt = lmv->tgts[index];
 422                 CERROR("%s: UUID %s already assigned at LOV target index %d:"
 423                        " rc = %d\n", obd->obd_name,
 424                        obd_uuid2str(&tgt->ltd_uuid), index, -EEXIST);
 425                 mutex_unlock(&lmv->lmv_init_mutex);
 426                 RETURN(-EEXIST);
 427         }
 428
 429         if (index >= lmv->tgts_size) {
 430                 /* We need to reallocate the lmv target array. */
 431                 struct lmv_tgt_desc **newtgts, **old = NULL;
 432                 __u32 newsize = 1;
 433                 __u32 oldsize = 0;
 434
 435                 while (newsize < index + 1)
 436                         newsize = newsize << 1;
 437                 OBD_ALLOC(newtgts, sizeof(*newtgts) * newsize);
 438                 if (newtgts == NULL) {
 439                         mutex_unlock(&lmv->lmv_init_mutex);
 440                         RETURN(-ENOMEM);
 441                 }
 442
 443                 if (lmv->tgts_size) {
 444                         memcpy(newtgts, lmv->tgts,
 445                                sizeof(*newtgts) * lmv->tgts_size);
 446                         old = lmv->tgts;
 447                         oldsize = lmv->tgts_size;
 448                 }
 449
 450                 lmv->tgts = newtgts;
 451                 lmv->tgts_size = newsize;
 452                 smp_rmb();
 453                 if (old)
 454                         OBD_FREE(old, sizeof(*old) * oldsize);
 455
 456                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n", lmv->tgts,
 457                        lmv->tgts_size);
 458         }
 459
 460         OBD_ALLOC_PTR(tgt);
 461         if (!tgt) {
 462                 mutex_unlock(&lmv->lmv_init_mutex);
 463                 RETURN(-ENOMEM);
 464         }
 465
 466         mutex_init(&tgt->ltd_fid_mutex);
 467         tgt->ltd_idx = index;
 468         tgt->ltd_uuid = *uuidp;
 469         tgt->ltd_active = 0;
 470         lmv->tgts[index] = tgt;
 471         if (index >= lmv->desc.ld_tgt_count) {
 472                 orig_tgt_count = lmv->desc.ld_tgt_count;
 473                 lmv->desc.ld_tgt_count = index + 1;
 474         }
 475
 476         if (lmv->connected == 0) {
 477                 /* lmv_check_connect() will connect this target. */
 478                 mutex_unlock(&lmv->lmv_init_mutex);
 479                 RETURN(0);
 480         }
 481
 482         /* Otherwise let's connect it ourselves */
 483         mutex_unlock(&lmv->lmv_init_mutex);
 484         rc = lmv_connect_mdc(obd, tgt);
 485         if (rc != 0) {
 486                 spin_lock(&lmv->lmv_lock);
 487                 if (lmv->desc.ld_tgt_count == index + 1)
 488                         lmv->desc.ld_tgt_count = orig_tgt_count;
 489                 memset(tgt, 0, sizeof(*tgt));
 490                 spin_unlock(&lmv->lmv_lock);
 491         } else {
 492                 int easize = sizeof(struct lmv_stripe_md) +
 493                         lmv->desc.ld_tgt_count * sizeof(struct lu_fid);
 494                 lmv_init_ea_size(obd->obd_self_export, easize, 0);
 495         }
 496
 497         RETURN(rc);
 498 }
 499
 500 static int lmv_check_connect(struct obd_device *obd)
 501 {
 502         struct lmv_obd          *lmv = &obd->u.lmv;
 503         struct lmv_tgt_desc     *tgt;
 504         __u32                    i;
 505         int                      rc;
 506         int                      easize;
 507         ENTRY;
 508
 509         if (lmv->connected)
 510                 RETURN(0);
 511
 512         mutex_lock(&lmv->lmv_init_mutex);
 513         if (lmv->connected) {
 514                 mutex_unlock(&lmv->lmv_init_mutex);
 515                 RETURN(0);
 516         }
 517
 518         if (lmv->desc.ld_tgt_count == 0) {
 519                 mutex_unlock(&lmv->lmv_init_mutex);
 520                 CERROR("%s: no targets configured.\n", obd->obd_name);
 521                 RETURN(-EINVAL);
 522         }
 523
 524         LASSERT(lmv->tgts != NULL);
 525
 526         if (lmv->tgts[0] == NULL) {
 527                 mutex_unlock(&lmv->lmv_init_mutex);
 528                 CERROR("%s: no target configured for index 0.\n",
 529                        obd->obd_name);
 530                 RETURN(-EINVAL);
 531         }
 532
 533         CDEBUG(D_CONFIG, "Time to connect %s to %s\n",
 534                lmv->cluuid.uuid, obd->obd_name);
 535
 536         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 537                 tgt = lmv->tgts[i];
 538                 if (tgt == NULL)
 539                         continue;
 540                 rc = lmv_connect_mdc(obd, tgt);
 541                 if (rc)
 542                         GOTO(out_disc, rc);
 543         }
 544
 545         lmv->connected = 1;
 546         easize = lmv_mds_md_size(lmv->desc.ld_tgt_count, LMV_MAGIC);
 547         lmv_init_ea_size(obd->obd_self_export, easize, 0);
 548         mutex_unlock(&lmv->lmv_init_mutex);
 549         RETURN(0);
 550
 551  out_disc:
 552         while (i-- > 0) {
 553                 int rc2;
 554                 tgt = lmv->tgts[i];
 555                 if (tgt == NULL)
 556                         continue;
 557                 tgt->ltd_active = 0;
 558                 if (tgt->ltd_exp) {
 559                         --lmv->desc.ld_active_tgt_count;
 560                         rc2 = obd_disconnect(tgt->ltd_exp);
 561                         if (rc2) {
 562                                 CERROR("LMV target %s disconnect on "
 563                                        "MDC idx %d: error %d\n",
 564                                        tgt->ltd_uuid.uuid, i, rc2);
 565                         }
 566                 }
 567         }
 568
 569         mutex_unlock(&lmv->lmv_init_mutex);
 570
 571         RETURN(rc);
 572 }
 573
 574 static int lmv_disconnect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 575 {
 576         struct lmv_obd         *lmv = &obd->u.lmv;
 577         struct obd_device      *mdc_obd;
 578         int                     rc;
 579         ENTRY;
 580
 581         LASSERT(tgt != NULL);
 582         LASSERT(obd != NULL);
 583
 584         mdc_obd = class_exp2obd(tgt->ltd_exp);
 585
 586         if (mdc_obd) {
 587                 mdc_obd->obd_force = obd->obd_force;
 588                 mdc_obd->obd_fail = obd->obd_fail;
 589                 mdc_obd->obd_no_recov = obd->obd_no_recov;
 590
 591                 if (lmv->targets_proc_entry != NULL)
 592                         lprocfs_remove_proc_entry(mdc_obd->obd_name,
 593                                                   lmv->targets_proc_entry);
 594         }
 595
 596         rc = obd_fid_fini(tgt->ltd_exp->exp_obd);
 597         if (rc)
 598                 CERROR("Can't finanize fids factory\n");
 599
 600         CDEBUG(D_INFO, "Disconnected from %s(%s) successfully\n",
 601                tgt->ltd_exp->exp_obd->obd_name,
 602                tgt->ltd_exp->exp_obd->obd_uuid.uuid);
 603
 604         obd_register_observer(tgt->ltd_exp->exp_obd, NULL);
 605         rc = obd_disconnect(tgt->ltd_exp);
 606         if (rc) {
 607                 if (tgt->ltd_active) {
 608                         CERROR("Target %s disconnect error %d\n",
 609                                tgt->ltd_uuid.uuid, rc);
 610                 }
 611         }
 612
 613         lmv_activate_target(lmv, tgt, 0);
 614         tgt->ltd_exp = NULL;
 615         RETURN(0);
 616 }
 617
 618 static int lmv_disconnect(struct obd_export *exp)
 619 {
 620         struct obd_device       *obd = class_exp2obd(exp);
 621         struct lmv_obd          *lmv = &obd->u.lmv;
 622         int                      rc;
 623         __u32                    i;
 624         ENTRY;
 625
 626         if (!lmv->tgts)
 627                 goto out_local;
 628
 629         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 630                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
 631                         continue;
 632
 633                 lmv_disconnect_mdc(obd, lmv->tgts[i]);
 634         }
 635
 636         if (lmv->targets_proc_entry != NULL)
 637                 lprocfs_remove(&lmv->targets_proc_entry);
 638         else
 639                 CERROR("/proc/fs/lustre/%s/%s/target_obds missing\n",
 640                        obd->obd_type->typ_name, obd->obd_name);
 641
 642 out_local:
 643         /*
 644          * This is the case when no real connection is established by
 645          * lmv_check_connect().
 646          */
 647         if (!lmv->connected)
 648                 class_export_put(exp);
 649         rc = class_disconnect(exp);
 650         lmv->connected = 0;
 651
 652         RETURN(rc);
 653 }
 654
 655 static int lmv_fid2path(struct obd_export *exp, int len, void *karg,
 656                         void __user *uarg)
 657 {
 658         struct obd_device       *obddev = class_exp2obd(exp);
 659         struct lmv_obd          *lmv = &obddev->u.lmv;
 660         struct getinfo_fid2path *gf;
 661         struct lmv_tgt_desc     *tgt;
 662         struct getinfo_fid2path *remote_gf = NULL;
 663         struct lu_fid           root_fid;
 664         int                     remote_gf_size = 0;
 665         int                     rc;
 666
 667         gf = karg;
 668         tgt = lmv_find_target(lmv, &gf->gf_fid);
 669         if (IS_ERR(tgt))
 670                 RETURN(PTR_ERR(tgt));
 671
 672         root_fid = *gf->gf_u.gf_root_fid;
 673         LASSERT(fid_is_sane(&root_fid));
 674
 675 repeat_fid2path:
 676         rc = obd_iocontrol(OBD_IOC_FID2PATH, tgt->ltd_exp, len, gf, uarg);
 677         if (rc != 0 && rc != -EREMOTE)
 678                 GOTO(out_fid2path, rc);
 679
 680         /* If remote_gf != NULL, it means just building the
 681          * path on the remote MDT, copy this path segement to gf */
 682         if (remote_gf != NULL) {
 683                 struct getinfo_fid2path *ori_gf;
 684                 char *ptr;
 685
 686                 ori_gf = (struct getinfo_fid2path *)karg;
 687                 if (strlen(ori_gf->gf_u.gf_path) +
 688                     strlen(gf->gf_u.gf_path) > ori_gf->gf_pathlen)
 689                         GOTO(out_fid2path, rc = -EOVERFLOW);
 690
 691                 ptr = ori_gf->gf_u.gf_path;
 692
 693                 memmove(ptr + strlen(gf->gf_u.gf_path) + 1, ptr,
 694                         strlen(ori_gf->gf_u.gf_path));
 695
 696                 strncpy(ptr, gf->gf_u.gf_path,
 697                         strlen(gf->gf_u.gf_path));
 698                 ptr += strlen(gf->gf_u.gf_path);
 699                 *ptr = '/';
 700         }
 701
 702         CDEBUG(D_INFO, "%s: get path %s "DFID" rec: %llu ln: %u\n",
 703                tgt->ltd_exp->exp_obd->obd_name,
 704                gf->gf_u.gf_path, PFID(&gf->gf_fid), gf->gf_recno,
 705                gf->gf_linkno);
 706
 707         if (rc == 0)
 708                 GOTO(out_fid2path, rc);
 709
 710         /* sigh, has to go to another MDT to do path building further */
 711         if (remote_gf == NULL) {
 712                 remote_gf_size = sizeof(*remote_gf) + PATH_MAX;
 713                 OBD_ALLOC(remote_gf, remote_gf_size);
 714                 if (remote_gf == NULL)
 715                         GOTO(out_fid2path, rc = -ENOMEM);
 716                 remote_gf->gf_pathlen = PATH_MAX;
 717         }
 718
 719         if (!fid_is_sane(&gf->gf_fid)) {
 720                 CERROR("%s: invalid FID "DFID": rc = %d\n",
 721                        tgt->ltd_exp->exp_obd->obd_name,
 722                        PFID(&gf->gf_fid), -EINVAL);
 723                 GOTO(out_fid2path, rc = -EINVAL);
 724         }
 725
 726         tgt = lmv_find_target(lmv, &gf->gf_fid);
 727         if (IS_ERR(tgt))
 728                 GOTO(out_fid2path, rc = -EINVAL);
 729
 730         remote_gf->gf_fid = gf->gf_fid;
 731         remote_gf->gf_recno = -1;
 732         remote_gf->gf_linkno = -1;
 733         memset(remote_gf->gf_u.gf_path, 0, remote_gf->gf_pathlen);
 734         *remote_gf->gf_u.gf_root_fid = root_fid;
 735         gf = remote_gf;
 736         goto repeat_fid2path;
 737
 738 out_fid2path:
 739         if (remote_gf != NULL)
 740                 OBD_FREE(remote_gf, remote_gf_size);
 741         RETURN(rc);
 742 }
 743
 744 static int lmv_hsm_req_count(struct lmv_obd *lmv,
 745                              const struct hsm_user_request *hur,
 746                              const struct lmv_tgt_desc *tgt_mds)
 747 {
 748         __u32                    i;
 749         int                      nr = 0;
 750         struct lmv_tgt_desc     *curr_tgt;
 751
 752         /* count how many requests must be sent to the given target */
 753         for (i = 0; i < hur->hur_request.hr_itemcount; i++) {
 754                 curr_tgt = lmv_find_target(lmv, &hur->hur_user_item[i].hui_fid);
 755                 if (IS_ERR(curr_tgt))
 756                         RETURN(PTR_ERR(curr_tgt));
 757                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid))
 758                         nr++;
 759         }
 760         return nr;
 761 }
 762
 763 static int lmv_hsm_req_build(struct lmv_obd *lmv,
 764                               struct hsm_user_request *hur_in,
 765                               const struct lmv_tgt_desc *tgt_mds,
 766                               struct hsm_user_request *hur_out)
 767 {
 768         __u32                    i, nr_out;
 769         struct lmv_tgt_desc     *curr_tgt;
 770
 771         /* build the hsm_user_request for the given target */
 772         hur_out->hur_request = hur_in->hur_request;
 773         nr_out = 0;
 774         for (i = 0; i < hur_in->hur_request.hr_itemcount; i++) {
 775                 curr_tgt = lmv_find_target(lmv,
 776                                            &hur_in->hur_user_item[i].hui_fid);
 777                 if (IS_ERR(curr_tgt))
 778                         RETURN(PTR_ERR(curr_tgt));
 779                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid)) {
 780                         hur_out->hur_user_item[nr_out] =
 781                                                 hur_in->hur_user_item[i];
 782                         nr_out++;
 783                 }
 784         }
 785         hur_out->hur_request.hr_itemcount = nr_out;
 786         memcpy(hur_data(hur_out), hur_data(hur_in),
 787                hur_in->hur_request.hr_data_len);
 788
 789         RETURN(0);
 790 }
 791
 792 static int lmv_hsm_ct_unregister(struct lmv_obd *lmv, unsigned int cmd, int len,
 793                                  struct lustre_kernelcomm *lk,
 794                                  void __user *uarg)
 795 {
 796         __u32   i;
 797         int     rc;
 798         ENTRY;
 799
 800         /* unregister request (call from llapi_hsm_copytool_fini) */
 801         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 802                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 803
 804                 if (tgt == NULL || tgt->ltd_exp == NULL)
 805                         continue;
 806                 /* best effort: try to clean as much as possible
 807                  * (continue on error) */
 808                 obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
 809         }
 810
 811         /* Whatever the result, remove copytool from kuc groups.
 812          * Unreached coordinators will get EPIPE on next requests
 813          * and will unregister automatically.
 814          */
 815         rc = libcfs_kkuc_group_rem(lk->lk_uid, lk->lk_group);
 816
 817         RETURN(rc);
 818 }
 819
 820 static int lmv_hsm_ct_register(struct lmv_obd *lmv, unsigned int cmd, int len,
 821                                struct lustre_kernelcomm *lk, __user void *uarg)
 822 {
 823         struct file             *filp;
 824         __u32                    i, j;
 825         int                      err, rc;
 826         bool                     any_set = false;
 827         struct kkuc_ct_data      kcd = { 0 };
 828         ENTRY;
 829
 830         /* All or nothing: try to register to all MDS.
 831          * In case of failure, unregister from previous MDS,
 832          * except if it because of inactive target. */
 833         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 834                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 835
 836                 if (tgt == NULL || tgt->ltd_exp == NULL)
 837                         continue;
 838                 err = obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
 839                 if (err) {
 840                         if (tgt->ltd_active) {
 841                                 /* permanent error */
 842                                 CERROR("%s: iocontrol MDC %s on MDT"
 843                                        " idx %d cmd %x: err = %d\n",
 844                                        lmv2obd_dev(lmv)->obd_name,
 845                                        tgt->ltd_uuid.uuid, i, cmd, err);
 846                                 rc = err;
 847                                 lk->lk_flags |= LK_FLG_STOP;
 848                                 /* unregister from previous MDS */
 849                                 for (j = 0; j < i; j++) {
 850                                         tgt = lmv->tgts[j];
 851                                         if (tgt == NULL || tgt->ltd_exp == NULL)
 852                                                 continue;
 853                                         obd_iocontrol(cmd, tgt->ltd_exp, len,
 854                                                       lk, uarg);
 855                                 }
 856                                 RETURN(rc);
 857                         }
 858                         /* else: transient error.
 859                          * kuc will register to the missing MDT
 860                          * when it is back */
 861                 } else {
 862                         any_set = true;
 863                 }
 864         }
 865
 866         if (!any_set)
 867                 /* no registration done: return error */
 868                 RETURN(-ENOTCONN);
 869
 870         /* at least one registration done, with no failure */
 871         filp = fget(lk->lk_wfd);
 872         if (filp == NULL)
 873                 RETURN(-EBADF);
 874
 875         kcd.kcd_magic = KKUC_CT_DATA_MAGIC;
 876         kcd.kcd_uuid = lmv->cluuid;
 877         kcd.kcd_archive = lk->lk_data;
 878
 879         rc = libcfs_kkuc_group_add(filp, lk->lk_uid, lk->lk_group,
 880                                    &kcd, sizeof(kcd));
 881         if (rc != 0)
 882                 fput(filp);
 883
 884         RETURN(rc);
 885 }
 886
 887
 888
 889
 890 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
 891                          int len, void *karg, void __user *uarg)
 892 {
 893         struct obd_device       *obddev = class_exp2obd(exp);
 894         struct lmv_obd          *lmv = &obddev->u.lmv;
 895         struct lmv_tgt_desc     *tgt = NULL;
 896         __u32                    i = 0;
 897         int                      rc = 0;
 898         int                      set = 0;
 899         __u32                    count = lmv->desc.ld_tgt_count;
 900         ENTRY;
 901
 902         if (count == 0)
 903                 RETURN(-ENOTTY);
 904
 905         switch (cmd) {
 906         case IOC_OBD_STATFS: {
 907                 struct obd_ioctl_data *data = karg;
 908                 struct obd_device *mdc_obd;
 909                 struct obd_statfs stat_buf = {0};
 910                 __u32 index;
 911
 912                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
 913                 if ((index >= count))
 914                         RETURN(-ENODEV);
 915
 916                 tgt = lmv->tgts[index];
 917                 if (tgt == NULL || !tgt->ltd_active)
 918                         RETURN(-ENODATA);
 919
 920                 mdc_obd = class_exp2obd(tgt->ltd_exp);
 921                 if (!mdc_obd)
 922                         RETURN(-EINVAL);
 923
 924                 /* copy UUID */
 925                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(mdc_obd),
 926                                  min((int) data->ioc_plen2,
 927                                      (int) sizeof(struct obd_uuid))))
 928                         RETURN(-EFAULT);
 929
 930                 rc = obd_statfs(NULL, tgt->ltd_exp, &stat_buf,
 931                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
 932                                 0);
 933                 if (rc)
 934                         RETURN(rc);
 935                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
 936                                  min((int) data->ioc_plen1,
 937                                      (int) sizeof(stat_buf))))
 938                         RETURN(-EFAULT);
 939                 break;
 940         }
 941         case OBD_IOC_QUOTACTL: {
 942                 struct if_quotactl *qctl = karg;
 943                 struct obd_quotactl *oqctl;
 944
 945                 if (qctl->qc_valid == QC_MDTIDX) {
 946                         if (count <= qctl->qc_idx)
 947                                 RETURN(-EINVAL);
 948
 949                         tgt = lmv->tgts[qctl->qc_idx];
 950                         if (tgt == NULL || tgt->ltd_exp == NULL)
 951                                 RETURN(-EINVAL);
 952                 } else if (qctl->qc_valid == QC_UUID) {
 953                         for (i = 0; i < count; i++) {
 954                                 tgt = lmv->tgts[i];
 955                                 if (tgt == NULL)
 956                                         continue;
 957                                 if (!obd_uuid_equals(&tgt->ltd_uuid,
 958                                                      &qctl->obd_uuid))
 959                                         continue;
 960
 961                                 if (tgt->ltd_exp == NULL)
 962                                         RETURN(-EINVAL);
 963
 964                                 break;
 965                         }
 966                 } else {
 967                         RETURN(-EINVAL);
 968                 }
 969
 970                 if (i >= count)
 971                         RETURN(-EAGAIN);
 972
 973                 LASSERT(tgt != NULL && tgt->ltd_exp != NULL);
 974                 OBD_ALLOC_PTR(oqctl);
 975                 if (!oqctl)
 976                         RETURN(-ENOMEM);
 977
 978                 QCTL_COPY(oqctl, qctl);
 979                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
 980                 if (rc == 0) {
 981                         QCTL_COPY(qctl, oqctl);
 982                         qctl->qc_valid = QC_MDTIDX;
 983                         qctl->obd_uuid = tgt->ltd_uuid;
 984                 }
 985                 OBD_FREE_PTR(oqctl);
 986                 break;
 987         }
 988         case LL_IOC_GET_CONNECT_FLAGS: {
 989                 tgt = lmv->tgts[0];
 990                 if (tgt == NULL || tgt->ltd_exp == NULL)
 991                         RETURN(-ENODATA);
 992                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
 993                 break;
 994         }
 995         case LL_IOC_FID2MDTIDX: {
 996                 struct lu_fid *fid = karg;
 997                 int             mdt_index;
 998
 999                 rc = lmv_fld_lookup(lmv, fid, &mdt_index);
1000                 if (rc != 0)
1001                         RETURN(rc);
1002
1003                 /* Note: this is from llite(see ll_dir_ioctl()), @uarg does not
1004                  * point to user space memory for FID2MDTIDX. */
1005                 *(__u32 *)uarg = mdt_index;
1006                 break;
1007         }
1008         case OBD_IOC_FID2PATH: {
1009                 rc = lmv_fid2path(exp, len, karg, uarg);
1010                 break;
1011         }
1012         case LL_IOC_HSM_STATE_GET:
1013         case LL_IOC_HSM_STATE_SET:
1014         case LL_IOC_HSM_ACTION: {
1015                 struct md_op_data       *op_data = karg;
1016
1017                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
1018                 if (IS_ERR(tgt))
1019                         RETURN(PTR_ERR(tgt));
1020
1021                 if (tgt->ltd_exp == NULL)
1022                         RETURN(-EINVAL);
1023
1024                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1025                 break;
1026         }
1027         case LL_IOC_HSM_PROGRESS: {
1028                 const struct hsm_progress_kernel *hpk = karg;
1029
1030                 tgt = lmv_find_target(lmv, &hpk->hpk_fid);
1031                 if (IS_ERR(tgt))
1032                         RETURN(PTR_ERR(tgt));
1033                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1034                 break;
1035         }
1036         case LL_IOC_HSM_REQUEST: {
1037                 struct hsm_user_request *hur = karg;
1038                 unsigned int reqcount = hur->hur_request.hr_itemcount;
1039
1040                 if (reqcount == 0)
1041                         RETURN(0);
1042
1043                 /* if the request is about a single fid
1044                  * or if there is a single MDS, no need to split
1045                  * the request. */
1046                 if (reqcount == 1 || count == 1) {
1047                         tgt = lmv_find_target(lmv,
1048                                               &hur->hur_user_item[0].hui_fid);
1049                         if (IS_ERR(tgt))
1050                                 RETURN(PTR_ERR(tgt));
1051                         rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1052                 } else {
1053                         /* split fid list to their respective MDS */
1054                         for (i = 0; i < count; i++) {
1055                                 int nr, rc1;
1056                                 size_t reqlen;
1057                                 struct hsm_user_request *req;
1058
1059                                 tgt = lmv->tgts[i];
1060                                 if (tgt == NULL || tgt->ltd_exp == NULL)
1061                                         continue;
1062
1063                                 nr = lmv_hsm_req_count(lmv, hur, tgt);
1064                                 if (nr < 0)
1065                                         RETURN(nr);
1066                                 if (nr == 0) /* nothing for this MDS */
1067                                         continue;
1068
1069                                 /* build a request with fids for this MDS */
1070                                 reqlen = offsetof(typeof(*hur),
1071                                                   hur_user_item[nr])
1072                                                 + hur->hur_request.hr_data_len;
1073                                 OBD_ALLOC_LARGE(req, reqlen);
1074                                 if (req == NULL)
1075                                         RETURN(-ENOMEM);
1076                                 rc1 = lmv_hsm_req_build(lmv, hur, tgt, req);
1077                                 if (rc1 < 0)
1078                                         GOTO(hsm_req_err, rc1);
1079                                 rc1 = obd_iocontrol(cmd, tgt->ltd_exp, reqlen,
1080                                                     req, uarg);
1081 hsm_req_err:
1082                                 if (rc1 != 0 && rc == 0)
1083                                         rc = rc1;
1084                                 OBD_FREE_LARGE(req, reqlen);
1085                         }
1086                 }
1087                 break;
1088         }
1089         case LL_IOC_LOV_SWAP_LAYOUTS: {
1090                 struct md_op_data       *op_data = karg;
1091                 struct lmv_tgt_desc     *tgt1, *tgt2;
1092
1093                 tgt1 = lmv_find_target(lmv, &op_data->op_fid1);
1094                 if (IS_ERR(tgt1))
1095                         RETURN(PTR_ERR(tgt1));
1096
1097                 tgt2 = lmv_find_target(lmv, &op_data->op_fid2);
1098                 if (IS_ERR(tgt2))
1099                         RETURN(PTR_ERR(tgt2));
1100
1101                 if ((tgt1->ltd_exp == NULL) || (tgt2->ltd_exp == NULL))
1102                         RETURN(-EINVAL);
1103
1104                 /* only files on same MDT can have their layouts swapped */
1105                 if (tgt1->ltd_idx != tgt2->ltd_idx)
1106                         RETURN(-EPERM);
1107
1108                 rc = obd_iocontrol(cmd, tgt1->ltd_exp, len, karg, uarg);
1109                 break;
1110         }
1111         case LL_IOC_HSM_CT_START: {
1112                 struct lustre_kernelcomm *lk = karg;
1113                 if (lk->lk_flags & LK_FLG_STOP)
1114                         rc = lmv_hsm_ct_unregister(lmv, cmd, len, lk, uarg);
1115                 else
1116                         rc = lmv_hsm_ct_register(lmv, cmd, len, lk, uarg);
1117                 break;
1118         }
1119         default:
1120                 for (i = 0; i < count; i++) {
1121                         struct obd_device *mdc_obd;
1122                         int err;
1123
1124                         tgt = lmv->tgts[i];
1125                         if (tgt == NULL || tgt->ltd_exp == NULL)
1126                                 continue;
1127                         /* ll_umount_begin() sets force flag but for lmv, not
1128                          * mdc. Let's pass it through */
1129                         mdc_obd = class_exp2obd(tgt->ltd_exp);
1130                         mdc_obd->obd_force = obddev->obd_force;
1131                         err = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1132                         if (err) {
1133                                 if (tgt->ltd_active) {
1134                                         CERROR("error: iocontrol MDC %s on MDT"
1135                                                " idx %d cmd %x: err = %d\n",
1136                                                tgt->ltd_uuid.uuid, i, cmd, err);
1137                                         if (!rc)
1138                                                 rc = err;
1139                                 }
1140                         } else
1141                                 set = 1;
1142                 }
1143                 if (!set && !rc)
1144                         rc = -EIO;
1145         }
1146         RETURN(rc);
1147 }
1148
1149 /**
1150  * This is _inode_ placement policy function (not name).
1151  */
1152 static int lmv_placement_policy(struct obd_device *obd,
1153                                 struct md_op_data *op_data, u32 *mds)
1154 {
1155         struct lmv_obd     *lmv = &obd->u.lmv;
1156         struct lmv_user_md *lum;
1157
1158         ENTRY;
1159
1160         LASSERT(mds != NULL);
1161
1162         if (lmv->desc.ld_tgt_count == 1) {
1163                 *mds = 0;
1164                 RETURN(0);
1165         }
1166
1167         lum = op_data->op_data;
1168         /* Choose MDS by
1169          * 1. See if the stripe offset is specified by lum.
1170          * 2. Then check if there is default stripe offset.
1171          * 3. Finally choose MDS by name hash if the parent
1172          *    is striped directory. (see lmv_locate_mds()). */
1173         if (op_data->op_cli_flags & CLI_SET_MEA && lum != NULL &&
1174             le32_to_cpu(lum->lum_stripe_offset) != (__u32)-1) {
1175                 *mds = le32_to_cpu(lum->lum_stripe_offset);
1176         } else if (op_data->op_default_stripe_offset != (__u32)-1) {
1177                 *mds = op_data->op_default_stripe_offset;
1178                 op_data->op_mds = *mds;
1179                 /* Correct the stripe offset in lum */
1180                 if (lum != NULL)
1181                         lum->lum_stripe_offset = cpu_to_le32(*mds);
1182         } else {
1183                 *mds = op_data->op_mds;
1184         }
1185
1186         RETURN(0);
1187 }
1188
1189 int __lmv_fid_alloc(struct lmv_obd *lmv, struct lu_fid *fid, u32 mds)
1190 {
1191         struct lmv_tgt_desc     *tgt;
1192         int                      rc;
1193         ENTRY;
1194
1195         tgt = lmv_get_target(lmv, mds, NULL);
1196         if (IS_ERR(tgt))
1197                 RETURN(PTR_ERR(tgt));
1198
1199         /*
1200          * New seq alloc and FLD setup should be atomic. Otherwise we may find
1201          * on server that seq in new allocated fid is not yet known.
1202          */
1203         mutex_lock(&tgt->ltd_fid_mutex);
1204
1205         if (tgt->ltd_active == 0 || tgt->ltd_exp == NULL)
1206                 GOTO(out, rc = -ENODEV);
1207
1208         /*
1209          * Asking underlying tgt layer to allocate new fid.
1210          */
1211         rc = obd_fid_alloc(NULL, tgt->ltd_exp, fid, NULL);
1212         if (rc > 0) {
1213                 LASSERT(fid_is_sane(fid));
1214                 rc = 0;
1215         }
1216
1217         EXIT;
1218 out:
1219         mutex_unlock(&tgt->ltd_fid_mutex);
1220         return rc;
1221 }
1222
1223 int lmv_fid_alloc(const struct lu_env *env, struct obd_export *exp,
1224                   struct lu_fid *fid, struct md_op_data *op_data)
1225 {
1226         struct obd_device     *obd = class_exp2obd(exp);
1227         struct lmv_obd        *lmv = &obd->u.lmv;
1228         u32                    mds = 0;
1229         int                    rc;
1230         ENTRY;
1231
1232         LASSERT(op_data != NULL);
1233         LASSERT(fid != NULL);
1234
1235         rc = lmv_placement_policy(obd, op_data, &mds);
1236         if (rc) {
1237                 CERROR("Can't get target for allocating fid, "
1238                        "rc %d\n", rc);
1239                 RETURN(rc);
1240         }
1241
1242         rc = __lmv_fid_alloc(lmv, fid, mds);
1243         if (rc) {
1244                 CERROR("Can't alloc new fid, rc %d\n", rc);
1245                 RETURN(rc);
1246         }
1247
1248         RETURN(rc);
1249 }
1250
1251 static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
1252 {
1253         struct lmv_obd  *lmv = &obd->u.lmv;
1254         struct lmv_desc *desc;
1255         int             rc;
1256         ENTRY;
1257
1258         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1259                 CERROR("LMV setup requires a descriptor\n");
1260                 RETURN(-EINVAL);
1261         }
1262
1263         desc = (struct lmv_desc *)lustre_cfg_buf(lcfg, 1);
1264         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1265                 CERROR("Lmv descriptor size wrong: %d > %d\n",
1266                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1267                 RETURN(-EINVAL);
1268         }
1269
1270         lmv->tgts_size = 32U;
1271         OBD_ALLOC(lmv->tgts, sizeof(*lmv->tgts) * lmv->tgts_size);
1272         if (lmv->tgts == NULL)
1273                 RETURN(-ENOMEM);
1274
1275         obd_str2uuid(&lmv->desc.ld_uuid, desc->ld_uuid.uuid);
1276         lmv->desc.ld_tgt_count = 0;
1277         lmv->desc.ld_active_tgt_count = 0;
1278         lmv->max_def_easize = 0;
1279         lmv->max_easize = 0;
1280
1281         spin_lock_init(&lmv->lmv_lock);
1282         mutex_init(&lmv->lmv_init_mutex);
1283
1284 #ifdef CONFIG_PROC_FS
1285         obd->obd_vars = lprocfs_lmv_obd_vars;
1286         lprocfs_obd_setup(obd);
1287         lprocfs_alloc_md_stats(obd, 0);
1288         rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
1289                                 0444, &lmv_proc_target_fops, obd);
1290         if (rc)
1291                 CWARN("%s: error adding LMV target_obd file: rc = %d\n",
1292                       obd->obd_name, rc);
1293 #endif
1294         rc = fld_client_init(&lmv->lmv_fld, obd->obd_name,
1295                              LUSTRE_CLI_FLD_HASH_DHT);
1296         if (rc) {
1297                 CERROR("Can't init FLD, err %d\n", rc);
1298                 GOTO(out, rc);
1299         }
1300
1301         RETURN(0);
1302
1303 out:
1304         return rc;
1305 }
1306
1307 static int lmv_cleanup(struct obd_device *obd)
1308 {
1309         struct lmv_obd   *lmv = &obd->u.lmv;
1310         ENTRY;
1311
1312         fld_client_fini(&lmv->lmv_fld);
1313         if (lmv->tgts != NULL) {
1314                 int i;
1315                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1316                         if (lmv->tgts[i] == NULL)
1317                                 continue;
1318                         lmv_del_target(lmv, i);
1319                 }
1320                 OBD_FREE(lmv->tgts, sizeof(*lmv->tgts) * lmv->tgts_size);
1321                 lmv->tgts_size = 0;
1322         }
1323         RETURN(0);
1324 }
1325
1326 static int lmv_process_config(struct obd_device *obd, size_t len, void *buf)
1327 {
1328         struct lustre_cfg       *lcfg = buf;
1329         struct obd_uuid         obd_uuid;
1330         int                     gen;
1331         __u32                   index;
1332         int                     rc;
1333         ENTRY;
1334
1335         switch (lcfg->lcfg_command) {
1336         case LCFG_ADD_MDC:
1337                 /* modify_mdc_tgts add 0:lustre-clilmv  1:lustre-MDT0000_UUID
1338                  * 2:0  3:1  4:lustre-MDT0000-mdc_UUID */
1339                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
1340                         GOTO(out, rc = -EINVAL);
1341
1342                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
1343
1344                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%u", &index) != 1)
1345                         GOTO(out, rc = -EINVAL);
1346                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", &gen) != 1)
1347                         GOTO(out, rc = -EINVAL);
1348                 rc = lmv_add_target(obd, &obd_uuid, index, gen);
1349                 GOTO(out, rc);
1350         default:
1351                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1352                 GOTO(out, rc = -EINVAL);
1353         }
1354 out:
1355         RETURN(rc);
1356 }
1357
1358 static int lmv_statfs(const struct lu_env *env, struct obd_export *exp,
1359                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
1360 {
1361         struct obd_device       *obd = class_exp2obd(exp);
1362         struct lmv_obd          *lmv = &obd->u.lmv;
1363         struct obd_statfs       *temp;
1364         int                      rc = 0;
1365         __u32                    i;
1366         ENTRY;
1367
1368         OBD_ALLOC(temp, sizeof(*temp));
1369         if (temp == NULL)
1370                 RETURN(-ENOMEM);
1371
1372         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1373                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1374                         continue;
1375
1376                 rc = obd_statfs(env, lmv->tgts[i]->ltd_exp, temp,
1377                                 max_age, flags);
1378                 if (rc) {
1379                         CERROR("can't stat MDS #%d (%s), error %d\n", i,
1380                                lmv->tgts[i]->ltd_exp->exp_obd->obd_name,
1381                                rc);
1382                         GOTO(out_free_temp, rc);
1383                 }
1384
1385                 if (i == 0) {
1386                         *osfs = *temp;
1387                         /* If the statfs is from mount, it will needs
1388                          * retrieve necessary information from MDT0.
1389                          * i.e. mount does not need the merged osfs
1390                          * from all of MDT.
1391                          * And also clients can be mounted as long as
1392                          * MDT0 is in service*/
1393                         if (flags & OBD_STATFS_FOR_MDT0)
1394                                 GOTO(out_free_temp, rc);
1395                 } else {
1396                         osfs->os_bavail += temp->os_bavail;
1397                         osfs->os_blocks += temp->os_blocks;
1398                         osfs->os_ffree += temp->os_ffree;
1399                         osfs->os_files += temp->os_files;
1400                 }
1401         }
1402
1403         EXIT;
1404 out_free_temp:
1405         OBD_FREE(temp, sizeof(*temp));
1406         return rc;
1407 }
1408
1409 static int lmv_get_root(struct obd_export *exp, const char *fileset,
1410                         struct lu_fid *fid)
1411 {
1412         struct obd_device    *obd = exp->exp_obd;
1413         struct lmv_obd       *lmv = &obd->u.lmv;
1414         int                   rc;
1415         ENTRY;
1416
1417         rc = md_get_root(lmv->tgts[0]->ltd_exp, fileset, fid);
1418         RETURN(rc);
1419 }
1420
1421 static int lmv_getxattr(struct obd_export *exp, const struct lu_fid *fid,
1422                         u64 valid, const char *name,
1423                         const char *input, int input_size, int output_size,
1424                         int flags, struct ptlrpc_request **request)
1425 {
1426         struct obd_device      *obd = exp->exp_obd;
1427         struct lmv_obd         *lmv = &obd->u.lmv;
1428         struct lmv_tgt_desc    *tgt;
1429         int                     rc;
1430         ENTRY;
1431
1432         tgt = lmv_find_target(lmv, fid);
1433         if (IS_ERR(tgt))
1434                 RETURN(PTR_ERR(tgt));
1435
1436         rc = md_getxattr(tgt->ltd_exp, fid, valid, name, input,
1437                          input_size, output_size, flags, request);
1438
1439         RETURN(rc);
1440 }
1441
1442 static int lmv_setxattr(struct obd_export *exp, const struct lu_fid *fid,
1443                         u64 valid, const char *name,
1444                         const char *input, int input_size, int output_size,
1445                         int flags, __u32 suppgid,
1446                         struct ptlrpc_request **request)
1447 {
1448         struct obd_device      *obd = exp->exp_obd;
1449         struct lmv_obd         *lmv = &obd->u.lmv;
1450         struct lmv_tgt_desc    *tgt;
1451         int                     rc;
1452         ENTRY;
1453
1454         tgt = lmv_find_target(lmv, fid);
1455         if (IS_ERR(tgt))
1456                 RETURN(PTR_ERR(tgt));
1457
1458         rc = md_setxattr(tgt->ltd_exp, fid, valid, name, input,
1459                          input_size, output_size, flags, suppgid,
1460                          request);
1461
1462         RETURN(rc);
1463 }
1464
1465 static int lmv_getattr(struct obd_export *exp, struct md_op_data *op_data,
1466                        struct ptlrpc_request **request)
1467 {
1468         struct obd_device       *obd = exp->exp_obd;
1469         struct lmv_obd          *lmv = &obd->u.lmv;
1470         struct lmv_tgt_desc     *tgt;
1471         int                      rc;
1472         ENTRY;
1473
1474         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1475         if (IS_ERR(tgt))
1476                 RETURN(PTR_ERR(tgt));
1477
1478         if (op_data->op_flags & MF_GET_MDT_IDX) {
1479                 op_data->op_mds = tgt->ltd_idx;
1480                 RETURN(0);
1481         }
1482
1483         rc = md_getattr(tgt->ltd_exp, op_data, request);
1484
1485         RETURN(rc);
1486 }
1487
1488 static int lmv_null_inode(struct obd_export *exp, const struct lu_fid *fid)
1489 {
1490         struct obd_device   *obd = exp->exp_obd;
1491         struct lmv_obd      *lmv = &obd->u.lmv;
1492         __u32                i;
1493         ENTRY;
1494
1495         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1496
1497         /*
1498          * With DNE every object can have two locks in different namespaces:
1499          * lookup lock in space of MDT storing direntry and update/open lock in
1500          * space of MDT storing inode.
1501          */
1502         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1503                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1504                         continue;
1505                 md_null_inode(lmv->tgts[i]->ltd_exp, fid);
1506         }
1507
1508         RETURN(0);
1509 }
1510
1511 static int lmv_close(struct obd_export *exp, struct md_op_data *op_data,
1512                      struct md_open_data *mod, struct ptlrpc_request **request)
1513 {
1514         struct obd_device     *obd = exp->exp_obd;
1515         struct lmv_obd        *lmv = &obd->u.lmv;
1516         struct lmv_tgt_desc   *tgt;
1517         int                    rc;
1518         ENTRY;
1519
1520         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1521         if (IS_ERR(tgt))
1522                 RETURN(PTR_ERR(tgt));
1523
1524         CDEBUG(D_INODE, "CLOSE "DFID"\n", PFID(&op_data->op_fid1));
1525         rc = md_close(tgt->ltd_exp, op_data, mod, request);
1526         RETURN(rc);
1527 }
1528
1529 /**
1530  * Choosing the MDT by name or FID in @op_data.
1531  * For non-striped directory, it will locate MDT by fid.
1532  * For striped-directory, it will locate MDT by name. And also
1533  * it will reset op_fid1 with the FID of the choosen stripe.
1534  **/
1535 struct lmv_tgt_desc *
1536 lmv_locate_target_for_name(struct lmv_obd *lmv, struct lmv_stripe_md *lsm,
1537                            const char *name, int namelen, struct lu_fid *fid,
1538                            u32 *mds)
1539 {
1540         struct lmv_tgt_desc     *tgt;
1541         const struct lmv_oinfo  *oinfo;
1542
1543         if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_BAD_NAME_HASH)) {
1544                 if (cfs_fail_val >= lsm->lsm_md_stripe_count)
1545                         RETURN(ERR_PTR(-EBADF));
1546                 oinfo = &lsm->lsm_md_oinfo[cfs_fail_val];
1547         } else {
1548                 oinfo = lsm_name_to_stripe_info(lsm, name, namelen);
1549                 if (IS_ERR(oinfo))
1550                         RETURN(ERR_CAST(oinfo));
1551         }
1552
1553         if (fid != NULL)
1554                 *fid = oinfo->lmo_fid;
1555         if (mds != NULL)
1556                 *mds = oinfo->lmo_mds;
1557
1558         tgt = lmv_get_target(lmv, oinfo->lmo_mds, NULL);
1559
1560         CDEBUG(D_INFO, "locate on mds %u "DFID"\n", oinfo->lmo_mds,
1561                PFID(&oinfo->lmo_fid));
1562         return tgt;
1563 }
1564
1565 /**
1566  * Locate mds by fid or name
1567  *
1568  * For striped directory (lsm != NULL), it will locate the stripe
1569  * by name hash (see lsm_name_to_stripe_info()). Note: if the hash_type
1570  * is unknown, it will return -EBADFD, and lmv_intent_lookup might need
1571  * walk through all of stripes to locate the entry.
1572  *
1573  * For normal direcotry, it will locate MDS by FID directly.
1574  * \param[in] lmv       LMV device
1575  * \param[in] op_data   client MD stack parameters, name, namelen
1576  *                      mds_num etc.
1577  * \param[in] fid       object FID used to locate MDS.
1578  *
1579  * retval               pointer to the lmv_tgt_desc if succeed.
1580  *                      ERR_PTR(errno) if failed.
1581  */
1582 struct lmv_tgt_desc*
1583 lmv_locate_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
1584                struct lu_fid *fid)
1585 {
1586         struct lmv_stripe_md    *lsm = op_data->op_mea1;
1587         struct lmv_tgt_desc     *tgt;
1588
1589         /* During creating VOLATILE file, it should honor the mdt
1590          * index if the file under striped dir is being restored, see
1591          * ct_restore(). */
1592         if (op_data->op_bias & MDS_CREATE_VOLATILE &&
1593             (int)op_data->op_mds != -1) {
1594                 int i;
1595                 tgt = lmv_get_target(lmv, op_data->op_mds, NULL);
1596                 if (IS_ERR(tgt))
1597                         return tgt;
1598
1599                 if (lsm != NULL) {
1600                         /* refill the right parent fid */
1601                         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
1602                                 struct lmv_oinfo *oinfo;
1603
1604                                 oinfo = &lsm->lsm_md_oinfo[i];
1605                                 if (oinfo->lmo_mds == op_data->op_mds) {
1606                                         *fid = oinfo->lmo_fid;
1607                                         break;
1608                                 }
1609                         }
1610
1611                         if (i == lsm->lsm_md_stripe_count)
1612                                 *fid = lsm->lsm_md_oinfo[0].lmo_fid;
1613                 }
1614
1615                 return tgt;
1616         }
1617
1618         if (lsm == NULL || op_data->op_namelen == 0) {
1619                 tgt = lmv_find_target(lmv, fid);
1620                 if (IS_ERR(tgt))
1621                         return tgt;
1622
1623                 op_data->op_mds = tgt->ltd_idx;
1624                 return tgt;
1625         }
1626
1627         return lmv_locate_target_for_name(lmv, lsm, op_data->op_name,
1628                                           op_data->op_namelen, fid,
1629                                           &op_data->op_mds);
1630 }
1631
1632 int lmv_create(struct obd_export *exp, struct md_op_data *op_data,
1633                 const void *data, size_t datalen, umode_t mode, uid_t uid,
1634                 gid_t gid, cfs_cap_t cap_effective, __u64 rdev,
1635                 struct ptlrpc_request **request)
1636 {
1637         struct obd_device       *obd = exp->exp_obd;
1638         struct lmv_obd          *lmv = &obd->u.lmv;
1639         struct lmv_tgt_desc     *tgt;
1640         int                      rc;
1641         ENTRY;
1642
1643         if (!lmv->desc.ld_active_tgt_count)
1644                 RETURN(-EIO);
1645
1646         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1647         if (IS_ERR(tgt))
1648                 RETURN(PTR_ERR(tgt));
1649
1650         CDEBUG(D_INODE, "CREATE name '%.*s' on "DFID" -> mds #%x\n",
1651                 (int)op_data->op_namelen, op_data->op_name,
1652                 PFID(&op_data->op_fid1), op_data->op_mds);
1653
1654         rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
1655         if (rc)
1656                 RETURN(rc);
1657         if (exp_connect_flags(exp) & OBD_CONNECT_DIR_STRIPE) {
1658                 /* Send the create request to the MDT where the object
1659                  * will be located */
1660                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
1661                 if (IS_ERR(tgt))
1662                         RETURN(PTR_ERR(tgt));
1663
1664                 op_data->op_mds = tgt->ltd_idx;
1665         } else {
1666                 CDEBUG(D_CONFIG, "Server doesn't support striped dirs\n");
1667         }
1668
1669         CDEBUG(D_INODE, "CREATE obj "DFID" -> mds #%x\n",
1670                PFID(&op_data->op_fid2), op_data->op_mds);
1671
1672         op_data->op_flags |= MF_MDC_CANCEL_FID1;
1673         rc = md_create(tgt->ltd_exp, op_data, data, datalen, mode, uid, gid,
1674                        cap_effective, rdev, request);
1675         if (rc == 0) {
1676                 if (*request == NULL)
1677                         RETURN(rc);
1678                 CDEBUG(D_INODE, "Created - "DFID"\n", PFID(&op_data->op_fid2));
1679         }
1680         RETURN(rc);
1681 }
1682
1683 static int
1684 lmv_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1685             const union ldlm_policy_data *policy, struct md_op_data *op_data,
1686             struct lustre_handle *lockh, __u64 extra_lock_flags)
1687 {
1688         struct obd_device        *obd = exp->exp_obd;
1689         struct lmv_obd           *lmv = &obd->u.lmv;
1690         struct lmv_tgt_desc      *tgt;
1691         int                       rc;
1692         ENTRY;
1693
1694         CDEBUG(D_INODE, "ENQUEUE on "DFID"\n", PFID(&op_data->op_fid1));
1695
1696         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1697         if (IS_ERR(tgt))
1698                 RETURN(PTR_ERR(tgt));
1699
1700         CDEBUG(D_INODE, "ENQUEUE on "DFID" -> mds #%u\n",
1701                PFID(&op_data->op_fid1), tgt->ltd_idx);
1702
1703         rc = md_enqueue(tgt->ltd_exp, einfo, policy, op_data, lockh,
1704                         extra_lock_flags);
1705
1706         RETURN(rc);
1707 }
1708
1709 static int
1710 lmv_getattr_name(struct obd_export *exp,struct md_op_data *op_data,
1711                  struct ptlrpc_request **preq)
1712 {
1713         struct ptlrpc_request   *req = NULL;
1714         struct obd_device       *obd = exp->exp_obd;
1715         struct lmv_obd          *lmv = &obd->u.lmv;
1716         struct lmv_tgt_desc     *tgt;
1717         struct mdt_body         *body;
1718         int                      rc;
1719         ENTRY;
1720
1721         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1722         if (IS_ERR(tgt))
1723                 RETURN(PTR_ERR(tgt));
1724
1725         CDEBUG(D_INODE, "GETATTR_NAME for %*s on "DFID" -> mds #%d\n",
1726                 (int)op_data->op_namelen, op_data->op_name,
1727                 PFID(&op_data->op_fid1), tgt->ltd_idx);
1728
1729         rc = md_getattr_name(tgt->ltd_exp, op_data, preq);
1730         if (rc != 0)
1731                 RETURN(rc);
1732
1733         body = req_capsule_server_get(&(*preq)->rq_pill, &RMF_MDT_BODY);
1734         LASSERT(body != NULL);
1735
1736         if (body->mbo_valid & OBD_MD_MDS) {
1737                 struct lu_fid rid = body->mbo_fid1;
1738                 CDEBUG(D_INODE, "Request attrs for "DFID"\n",
1739                        PFID(&rid));
1740
1741                 tgt = lmv_find_target(lmv, &rid);
1742                 if (IS_ERR(tgt)) {
1743                         ptlrpc_req_finished(*preq);
1744                         preq = NULL;
1745                         RETURN(PTR_ERR(tgt));
1746                 }
1747
1748                 op_data->op_fid1 = rid;
1749                 op_data->op_valid |= OBD_MD_FLCROSSREF;
1750                 op_data->op_namelen = 0;
1751                 op_data->op_name = NULL;
1752                 rc = md_getattr_name(tgt->ltd_exp, op_data, &req);
1753                 ptlrpc_req_finished(*preq);
1754                 *preq = req;
1755         }
1756
1757         RETURN(rc);
1758 }
1759
1760 #define md_op_data_fid(op_data, fl)                     \
1761         (fl == MF_MDC_CANCEL_FID1 ? &op_data->op_fid1 : \
1762          fl == MF_MDC_CANCEL_FID2 ? &op_data->op_fid2 : \
1763          fl == MF_MDC_CANCEL_FID3 ? &op_data->op_fid3 : \
1764          fl == MF_MDC_CANCEL_FID4 ? &op_data->op_fid4 : \
1765          NULL)
1766
1767 static int lmv_early_cancel(struct obd_export *exp, struct lmv_tgt_desc *tgt,
1768                             struct md_op_data *op_data, __u32 op_tgt,
1769                             enum ldlm_mode mode, int bits, int flag)
1770 {
1771         struct lu_fid *fid = md_op_data_fid(op_data, flag);
1772         struct lmv_obd *lmv = &exp->exp_obd->u.lmv;
1773         union ldlm_policy_data policy = { { 0 } };
1774         int rc = 0;
1775         ENTRY;
1776
1777         if (!fid_is_sane(fid))
1778                 RETURN(0);
1779
1780         if (tgt == NULL) {
1781                 tgt = lmv_find_target(lmv, fid);
1782                 if (IS_ERR(tgt))
1783                         RETURN(PTR_ERR(tgt));
1784         }
1785
1786         if (tgt->ltd_idx != op_tgt) {
1787                 CDEBUG(D_INODE, "EARLY_CANCEL on "DFID"\n", PFID(fid));
1788                 policy.l_inodebits.bits = bits;
1789                 rc = md_cancel_unused(tgt->ltd_exp, fid, &policy,
1790                                       mode, LCF_ASYNC, NULL);
1791         } else {
1792                 CDEBUG(D_INODE,
1793                        "EARLY_CANCEL skip operation target %d on "DFID"\n",
1794                        op_tgt, PFID(fid));
1795                 op_data->op_flags |= flag;
1796                 rc = 0;
1797         }
1798
1799         RETURN(rc);
1800 }
1801
1802 /*
1803  * llite passes fid of an target inode in op_data->op_fid1 and id of directory in
1804  * op_data->op_fid2
1805  */
1806 static int lmv_link(struct obd_export *exp, struct md_op_data *op_data,
1807                     struct ptlrpc_request **request)
1808 {
1809         struct obd_device       *obd = exp->exp_obd;
1810         struct lmv_obd          *lmv = &obd->u.lmv;
1811         struct lmv_tgt_desc     *tgt;
1812         int                      rc;
1813         ENTRY;
1814
1815         LASSERT(op_data->op_namelen != 0);
1816
1817         CDEBUG(D_INODE, "LINK "DFID":%*s to "DFID"\n",
1818                PFID(&op_data->op_fid2), (int)op_data->op_namelen,
1819                op_data->op_name, PFID(&op_data->op_fid1));
1820
1821         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
1822         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
1823         op_data->op_cap = cfs_curproc_cap_pack();
1824         if (op_data->op_mea2 != NULL) {
1825                 struct lmv_stripe_md    *lsm = op_data->op_mea2;
1826                 const struct lmv_oinfo  *oinfo;
1827
1828                 oinfo = lsm_name_to_stripe_info(lsm, op_data->op_name,
1829                                                 op_data->op_namelen);
1830                 if (IS_ERR(oinfo))
1831                         RETURN(PTR_ERR(oinfo));
1832
1833                 op_data->op_fid2 = oinfo->lmo_fid;
1834         }
1835
1836         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid2);
1837         if (IS_ERR(tgt))
1838                 RETURN(PTR_ERR(tgt));
1839
1840         /*
1841          * Cancel UPDATE lock on child (fid1).
1842          */
1843         op_data->op_flags |= MF_MDC_CANCEL_FID2;
1844         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_idx, LCK_EX,
1845                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
1846         if (rc != 0)
1847                 RETURN(rc);
1848
1849         rc = md_link(tgt->ltd_exp, op_data, request);
1850
1851         RETURN(rc);
1852 }
1853
1854 static int lmv_rename(struct obd_export *exp, struct md_op_data *op_data,
1855                       const char *old, size_t oldlen,
1856                       const char *new, size_t newlen,
1857                       struct ptlrpc_request **request)
1858 {
1859         struct obd_device       *obd = exp->exp_obd;
1860         struct lmv_obd          *lmv = &obd->u.lmv;
1861         struct lmv_tgt_desc     *src_tgt;
1862         struct lmv_tgt_desc     *tgt_tgt;
1863         struct obd_export       *target_exp;
1864         struct mdt_body         *body;
1865         int                     rc;
1866         ENTRY;
1867
1868         LASSERT(oldlen != 0);
1869
1870         CDEBUG(D_INODE, "RENAME %.*s in "DFID":%d to %.*s in "DFID":%d\n",
1871                (int)oldlen, old, PFID(&op_data->op_fid1),
1872                op_data->op_mea1 ? op_data->op_mea1->lsm_md_stripe_count : 0,
1873                (int)newlen, new, PFID(&op_data->op_fid2),
1874                op_data->op_mea2 ? op_data->op_mea2->lsm_md_stripe_count : 0);
1875
1876         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
1877         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
1878         op_data->op_cap = cfs_curproc_cap_pack();
1879         if (op_data->op_cli_flags & CLI_MIGRATE) {
1880                 LASSERTF(fid_is_sane(&op_data->op_fid3), "invalid FID "DFID"\n",
1881                          PFID(&op_data->op_fid3));
1882
1883                 if (op_data->op_mea1 != NULL) {
1884                         struct lmv_stripe_md    *lsm = op_data->op_mea1;
1885                         struct lmv_tgt_desc     *tmp;
1886
1887                         /* Fix the parent fid for striped dir */
1888                         tmp = lmv_locate_target_for_name(lmv, lsm, old,
1889                                                          oldlen,
1890                                                          &op_data->op_fid1,
1891                                                          NULL);
1892                         if (IS_ERR(tmp))
1893                                 RETURN(PTR_ERR(tmp));
1894                 }
1895
1896                 rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
1897                 if (rc != 0)
1898                         RETURN(rc);
1899
1900                 src_tgt = lmv_find_target(lmv, &op_data->op_fid3);
1901                 if (IS_ERR(src_tgt))
1902                         RETURN(PTR_ERR(src_tgt));
1903
1904                 target_exp = src_tgt->ltd_exp;
1905         } else {
1906                 if (op_data->op_mea1 != NULL) {
1907                         struct lmv_stripe_md    *lsm = op_data->op_mea1;
1908
1909                         src_tgt = lmv_locate_target_for_name(lmv, lsm, old,
1910                                                              oldlen,
1911                                                              &op_data->op_fid1,
1912                                                              &op_data->op_mds);
1913                 } else {
1914                         src_tgt = lmv_find_target(lmv, &op_data->op_fid1);
1915                 }
1916                 if (IS_ERR(src_tgt))
1917                         RETURN(PTR_ERR(src_tgt));
1918
1919
1920                 if (op_data->op_mea2 != NULL) {
1921                         struct lmv_stripe_md    *lsm = op_data->op_mea2;
1922
1923                         tgt_tgt = lmv_locate_target_for_name(lmv, lsm, new,
1924                                                              newlen,
1925                                                              &op_data->op_fid2,
1926                                                              &op_data->op_mds);
1927                 } else {
1928                         tgt_tgt = lmv_find_target(lmv, &op_data->op_fid2);
1929
1930                 }
1931                 if (IS_ERR(tgt_tgt))
1932                         RETURN(PTR_ERR(tgt_tgt));
1933
1934                 target_exp = tgt_tgt->ltd_exp;
1935         }
1936
1937         /*
1938          * LOOKUP lock on src child (fid3) should also be cancelled for
1939          * src_tgt in mdc_rename.
1940          */
1941         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
1942
1943         /*
1944          * Cancel UPDATE locks on tgt parent (fid2), tgt_tgt is its
1945          * own target.
1946          */
1947         rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
1948                               LCK_EX, MDS_INODELOCK_UPDATE,
1949                               MF_MDC_CANCEL_FID2);
1950
1951         if (rc != 0)
1952                 RETURN(rc);
1953         /*
1954          * Cancel LOOKUP locks on source child (fid3) for parent tgt_tgt.
1955          */
1956         if (fid_is_sane(&op_data->op_fid3)) {
1957                 struct lmv_tgt_desc *tgt;
1958
1959                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
1960                 if (IS_ERR(tgt))
1961                         RETURN(PTR_ERR(tgt));
1962
1963                 /* Cancel LOOKUP lock on its parent */
1964                 rc = lmv_early_cancel(exp, tgt, op_data, src_tgt->ltd_idx,
1965                                       LCK_EX, MDS_INODELOCK_LOOKUP,
1966                                       MF_MDC_CANCEL_FID3);
1967                 if (rc != 0)
1968                         RETURN(rc);
1969
1970                 rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
1971                                       LCK_EX, MDS_INODELOCK_FULL,
1972                                       MF_MDC_CANCEL_FID3);
1973                 if (rc != 0)
1974                         RETURN(rc);
1975         }
1976
1977 retry_rename:
1978         /*
1979          * Cancel all the locks on tgt child (fid4).
1980          */
1981         if (fid_is_sane(&op_data->op_fid4)) {
1982                 struct lmv_tgt_desc *tgt;
1983
1984                 rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
1985                                       LCK_EX, MDS_INODELOCK_FULL,
1986                                       MF_MDC_CANCEL_FID4);
1987                 if (rc != 0)
1988                         RETURN(rc);
1989
1990                 tgt = lmv_find_target(lmv, &op_data->op_fid4);
1991                 if (IS_ERR(tgt))
1992                         RETURN(PTR_ERR(tgt));
1993
1994                 /* Since the target child might be destroyed, and it might
1995                  * become orphan, and we can only check orphan on the local
1996                  * MDT right now, so we send rename request to the MDT where
1997                  * target child is located. If target child does not exist,
1998                  * then it will send the request to the target parent */
1999                 target_exp = tgt->ltd_exp;
2000         }
2001
2002         rc = md_rename(target_exp, op_data, old, oldlen, new, newlen,
2003                        request);
2004
2005         if (rc != 0 && rc != -EXDEV)
2006                 RETURN(rc);
2007
2008         body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
2009         if (body == NULL)
2010                 RETURN(-EPROTO);
2011
2012         /* Not cross-ref case, just get out of here. */
2013         if (likely(!(body->mbo_valid & OBD_MD_MDS)))
2014                 RETURN(rc);
2015
2016         CDEBUG(D_INODE, "%s: try rename to another MDT for "DFID"\n",
2017                exp->exp_obd->obd_name, PFID(&body->mbo_fid1));
2018
2019         op_data->op_fid4 = body->mbo_fid1;
2020         ptlrpc_req_finished(*request);
2021         *request = NULL;
2022         goto retry_rename;
2023 }
2024
2025 static int lmv_setattr(struct obd_export *exp, struct md_op_data *op_data,
2026                        void *ea, size_t ealen, struct ptlrpc_request **request)
2027 {
2028         struct obd_device       *obd = exp->exp_obd;
2029         struct lmv_obd          *lmv = &obd->u.lmv;
2030         struct lmv_tgt_desc     *tgt;
2031         int                      rc = 0;
2032         ENTRY;
2033
2034         CDEBUG(D_INODE, "SETATTR for "DFID", valid 0x%x\n",
2035                PFID(&op_data->op_fid1), op_data->op_attr.ia_valid);
2036
2037         op_data->op_flags |= MF_MDC_CANCEL_FID1;
2038         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2039         if (IS_ERR(tgt))
2040                 RETURN(PTR_ERR(tgt));
2041
2042         rc = md_setattr(tgt->ltd_exp, op_data, ea, ealen, request);
2043
2044         RETURN(rc);
2045 }
2046
2047 static int lmv_fsync(struct obd_export *exp, const struct lu_fid *fid,
2048                      struct ptlrpc_request **request)
2049 {
2050         struct obd_device       *obd = exp->exp_obd;
2051         struct lmv_obd          *lmv = &obd->u.lmv;
2052         struct lmv_tgt_desc     *tgt;
2053         int                      rc;
2054         ENTRY;
2055
2056         tgt = lmv_find_target(lmv, fid);
2057         if (IS_ERR(tgt))
2058                 RETURN(PTR_ERR(tgt));
2059
2060         rc = md_fsync(tgt->ltd_exp, fid, request);
2061         RETURN(rc);
2062 }
2063
2064 /**
2065  * Get current minimum entry from striped directory
2066  *
2067  * This function will search the dir entry, whose hash value is the
2068  * closest(>=) to @hash_offset, from all of sub-stripes, and it is
2069  * only being called for striped directory.
2070  *
2071  * \param[in] exp               export of LMV
2072  * \param[in] op_data           parameters transferred beween client MD stack
2073  *                              stripe_information will be included in this
2074  *                              parameter
2075  * \param[in] cb_op             ldlm callback being used in enqueue in
2076  *                              mdc_read_page
2077  * \param[in] hash_offset       the hash value, which is used to locate
2078  *                              minum(closet) dir entry
2079  * \param[in|out] stripe_offset the caller use this to indicate the stripe
2080  *                              index of last entry, so to avoid hash conflict
2081  *                              between stripes. It will also be used to
2082  *                              return the stripe index of current dir entry.
2083  * \param[in|out] entp          the minum entry and it also is being used
2084  *                              to input the last dir entry to resolve the
2085  *                              hash conflict
2086  *
2087  * \param[out] ppage            the page which holds the minum entry
2088  *
2089  * \retval                      = 0 get the entry successfully
2090  *                              negative errno (< 0) does not get the entry
2091  */
2092 static int lmv_get_min_striped_entry(struct obd_export *exp,
2093                                      struct md_op_data *op_data,
2094                                      struct md_callback *cb_op,
2095                                      __u64 hash_offset, int *stripe_offset,
2096                                      struct lu_dirent **entp,
2097                                      struct page **ppage)
2098 {
2099         struct obd_device       *obd = exp->exp_obd;
2100         struct lmv_obd          *lmv = &obd->u.lmv;
2101         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2102         struct lmv_tgt_desc     *tgt;
2103         int                     stripe_count;
2104         struct lu_dirent        *min_ent = NULL;
2105         struct page             *min_page = NULL;
2106         int                     min_idx = 0;
2107         int                     i;
2108         int                     rc = 0;
2109         ENTRY;
2110
2111         stripe_count = lsm->lsm_md_stripe_count;
2112         for (i = 0; i < stripe_count; i++) {
2113                 struct lu_dirent        *ent = NULL;
2114                 struct page             *page = NULL;
2115                 struct lu_dirpage       *dp;
2116                 __u64                   stripe_hash = hash_offset;
2117
2118                 tgt = lmv_get_target(lmv, lsm->lsm_md_oinfo[i].lmo_mds, NULL);
2119                 if (IS_ERR(tgt))
2120                         GOTO(out, rc = PTR_ERR(tgt));
2121
2122                 /* op_data will be shared by each stripe, so we need
2123                  * reset these value for each stripe */
2124                 op_data->op_fid1 = lsm->lsm_md_oinfo[i].lmo_fid;
2125                 op_data->op_fid2 = lsm->lsm_md_oinfo[i].lmo_fid;
2126                 op_data->op_data = lsm->lsm_md_oinfo[i].lmo_root;
2127 next:
2128                 rc = md_read_page(tgt->ltd_exp, op_data, cb_op, stripe_hash,
2129                                   &page);
2130                 if (rc != 0)
2131                         GOTO(out, rc);
2132
2133                 dp = page_address(page);
2134                 for (ent = lu_dirent_start(dp); ent != NULL;
2135                      ent = lu_dirent_next(ent)) {
2136                         /* Skip dummy entry */
2137                         if (le16_to_cpu(ent->lde_namelen) == 0)
2138                                 continue;
2139
2140                         if (le64_to_cpu(ent->lde_hash) < hash_offset)
2141                                 continue;
2142
2143                         if (le64_to_cpu(ent->lde_hash) == hash_offset &&
2144                             (*entp == ent || i < *stripe_offset))
2145                                 continue;
2146
2147                         /* skip . and .. for other stripes */
2148                         if (i != 0 &&
2149                             (strncmp(ent->lde_name, ".",
2150                                      le16_to_cpu(ent->lde_namelen)) == 0 ||
2151                              strncmp(ent->lde_name, "..",
2152                                      le16_to_cpu(ent->lde_namelen)) == 0))
2153                                 continue;
2154                         break;
2155                 }
2156
2157                 if (ent == NULL) {
2158                         stripe_hash = le64_to_cpu(dp->ldp_hash_end);
2159
2160                         kunmap(page);
2161                         put_page(page);
2162                         page = NULL;
2163
2164                         /* reach the end of current stripe, go to next stripe */
2165                         if (stripe_hash == MDS_DIR_END_OFF)
2166                                 continue;
2167                         else
2168                                 goto next;
2169                 }
2170
2171                 if (min_ent != NULL) {
2172                         if (le64_to_cpu(min_ent->lde_hash) >
2173                             le64_to_cpu(ent->lde_hash)) {
2174                                 min_ent = ent;
2175                                 kunmap(min_page);
2176                                 put_page(min_page);
2177                                 min_idx = i;
2178                                 min_page = page;
2179                         } else {
2180                                 kunmap(page);
2181                                 put_page(page);
2182                                 page = NULL;
2183                         }
2184                 } else {
2185                         min_ent = ent;
2186                         min_page = page;
2187                         min_idx = i;
2188                 }
2189         }
2190
2191 out:
2192         if (*ppage != NULL) {
2193                 kunmap(*ppage);
2194                 put_page(*ppage);
2195         }
2196         *stripe_offset = min_idx;
2197         *entp = min_ent;
2198         *ppage = min_page;
2199         RETURN(rc);
2200 }
2201
2202 /**
2203  * Build dir entry page from a striped directory
2204  *
2205  * This function gets one entry by @offset from a striped directory. It will
2206  * read entries from all of stripes, and choose one closest to the required
2207  * offset(&offset). A few notes
2208  * 1. skip . and .. for non-zero stripes, because there can only have one .
2209  * and .. in a directory.
2210  * 2. op_data will be shared by all of stripes, instead of allocating new
2211  * one, so need to restore before reusing.
2212  * 3. release the entry page if that is not being chosen.
2213  *
2214  * \param[in] exp       obd export refer to LMV
2215  * \param[in] op_data   hold those MD parameters of read_entry
2216  * \param[in] cb_op     ldlm callback being used in enqueue in mdc_read_entry
2217  * \param[out] ldp      the entry being read
2218  * \param[out] ppage    the page holding the entry. Note: because the entry
2219  *                      will be accessed in upper layer, so we need hold the
2220  *                      page until the usages of entry is finished, see
2221  *                      ll_dir_entry_next.
2222  *
2223  * retval               =0 if get entry successfully
2224  *                      <0 cannot get entry
2225  */
2226 static int lmv_read_striped_page(struct obd_export *exp,
2227                                  struct md_op_data *op_data,
2228                                  struct md_callback *cb_op,
2229                                  __u64 offset, struct page **ppage)
2230 {
2231         struct lu_fid           master_fid = op_data->op_fid1;
2232         struct inode            *master_inode = op_data->op_data;
2233         __u64                   hash_offset = offset;
2234         struct lu_dirpage       *dp;
2235         struct page             *min_ent_page = NULL;
2236         struct page             *ent_page = NULL;
2237         struct lu_dirent        *ent;
2238         void                    *area;
2239         int                     ent_idx = 0;
2240         struct lu_dirent        *min_ent = NULL;
2241         struct lu_dirent        *last_ent;
2242         size_t                  left_bytes;
2243         int                     rc;
2244         ENTRY;
2245
2246         /* Allocate a page and read entries from all of stripes and fill
2247          * the page by hash order */
2248         ent_page = alloc_page(GFP_KERNEL);
2249         if (ent_page == NULL)
2250                 RETURN(-ENOMEM);
2251
2252         /* Initialize the entry page */
2253         dp = kmap(ent_page);
2254         memset(dp, 0, sizeof(*dp));
2255         dp->ldp_hash_start = cpu_to_le64(offset);
2256         dp->ldp_flags |= LDF_COLLIDE;
2257
2258         area = dp + 1;
2259         left_bytes = PAGE_SIZE - sizeof(*dp);
2260         ent = area;
2261         last_ent = ent;
2262         do {
2263                 __u16   ent_size;
2264
2265                 /* Find the minum entry from all sub-stripes */
2266                 rc = lmv_get_min_striped_entry(exp, op_data, cb_op, hash_offset,
2267                                                &ent_idx, &min_ent,
2268                                                &min_ent_page);
2269                 if (rc != 0)
2270                         GOTO(out, rc);
2271
2272                 /* If it can not get minum entry, it means it already reaches
2273                  * the end of this directory */
2274                 if (min_ent == NULL) {
2275                         last_ent->lde_reclen = 0;
2276                         hash_offset = MDS_DIR_END_OFF;
2277                         GOTO(out, rc);
2278                 }
2279
2280                 ent_size = le16_to_cpu(min_ent->lde_reclen);
2281
2282                 /* the last entry lde_reclen is 0, but it might not
2283                  * the end of this entry of this temporay entry */
2284                 if (ent_size == 0)
2285                         ent_size = lu_dirent_calc_size(
2286                                         le16_to_cpu(min_ent->lde_namelen),
2287                                         le32_to_cpu(min_ent->lde_attrs));
2288                 if (ent_size > left_bytes) {
2289                         last_ent->lde_reclen = cpu_to_le16(0);
2290                         hash_offset = le64_to_cpu(min_ent->lde_hash);
2291                         GOTO(out, rc);
2292                 }
2293
2294                 memcpy(ent, min_ent, ent_size);
2295
2296                 /* Replace . with master FID and Replace .. with the parent FID
2297                  * of master object */
2298                 if (strncmp(ent->lde_name, ".",
2299                             le16_to_cpu(ent->lde_namelen)) == 0 &&
2300                     le16_to_cpu(ent->lde_namelen) == 1)
2301                         fid_cpu_to_le(&ent->lde_fid, &master_fid);
2302                 else if (strncmp(ent->lde_name, "..",
2303                                    le16_to_cpu(ent->lde_namelen)) == 0 &&
2304                            le16_to_cpu(ent->lde_namelen) == 2)
2305                         fid_cpu_to_le(&ent->lde_fid, &op_data->op_fid3);
2306
2307                 left_bytes -= ent_size;
2308                 ent->lde_reclen = cpu_to_le16(ent_size);
2309                 last_ent = ent;
2310                 ent = (void *)ent + ent_size;
2311                 hash_offset = le64_to_cpu(min_ent->lde_hash);
2312                 if (hash_offset == MDS_DIR_END_OFF) {
2313                         last_ent->lde_reclen = 0;
2314                         break;
2315                 }
2316         } while (1);
2317 out:
2318         if (min_ent_page != NULL) {
2319                 kunmap(min_ent_page);
2320                 put_page(min_ent_page);
2321         }
2322
2323         if (unlikely(rc != 0)) {
2324                 __free_page(ent_page);
2325                 ent_page = NULL;
2326         } else {
2327                 if (ent == area)
2328                         dp->ldp_flags |= LDF_EMPTY;
2329                 dp->ldp_flags = cpu_to_le32(dp->ldp_flags);
2330                 dp->ldp_hash_end = cpu_to_le64(hash_offset);
2331         }
2332
2333         /* We do not want to allocate md_op_data during each
2334          * dir entry reading, so op_data will be shared by every stripe,
2335          * then we need to restore it back to original value before
2336          * return to the upper layer */
2337         op_data->op_fid1 = master_fid;
2338         op_data->op_fid2 = master_fid;
2339         op_data->op_data = master_inode;
2340
2341         *ppage = ent_page;
2342
2343         RETURN(rc);
2344 }
2345
2346 int lmv_read_page(struct obd_export *exp, struct md_op_data *op_data,
2347                   struct md_callback *cb_op, __u64 offset,
2348                   struct page **ppage)
2349 {
2350         struct obd_device       *obd = exp->exp_obd;
2351         struct lmv_obd          *lmv = &obd->u.lmv;
2352         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2353         struct lmv_tgt_desc     *tgt;
2354         int                     rc;
2355         ENTRY;
2356
2357         if (unlikely(lsm != NULL)) {
2358                 rc = lmv_read_striped_page(exp, op_data, cb_op, offset, ppage);
2359                 RETURN(rc);
2360         }
2361
2362         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2363         if (IS_ERR(tgt))
2364                 RETURN(PTR_ERR(tgt));
2365
2366         rc = md_read_page(tgt->ltd_exp, op_data, cb_op, offset, ppage);
2367
2368         RETURN(rc);
2369 }
2370
2371 /**
2372  * Unlink a file/directory
2373  *
2374  * Unlink a file or directory under the parent dir. The unlink request
2375  * usually will be sent to the MDT where the child is located, but if
2376  * the client does not have the child FID then request will be sent to the
2377  * MDT where the parent is located.
2378  *
2379  * If the parent is a striped directory then it also needs to locate which
2380  * stripe the name of the child is located, and replace the parent FID
2381  * (@op->op_fid1) with the stripe FID. Note: if the stripe is unknown,
2382  * it will walk through all of sub-stripes until the child is being
2383  * unlinked finally.
2384  *
2385  * \param[in] exp       export refer to LMV
2386  * \param[in] op_data   different parameters transferred beween client
2387  *                      MD stacks, name, namelen, FIDs etc.
2388  *                      op_fid1 is the parent FID, op_fid2 is the child
2389  *                      FID.
2390  * \param[out] request  point to the request of unlink.
2391  *
2392  * retval               0 if succeed
2393  *                      negative errno if failed.
2394  */
2395 static int lmv_unlink(struct obd_export *exp, struct md_op_data *op_data,
2396                       struct ptlrpc_request **request)
2397 {
2398         struct obd_device       *obd = exp->exp_obd;
2399         struct lmv_obd          *lmv = &obd->u.lmv;
2400         struct lmv_tgt_desc     *tgt = NULL;
2401         struct lmv_tgt_desc     *parent_tgt = NULL;
2402         struct mdt_body         *body;
2403         int                     rc;
2404         int                     stripe_index = 0;
2405         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2406         ENTRY;
2407
2408 retry_unlink:
2409         /* For striped dir, we need to locate the parent as well */
2410         if (lsm != NULL) {
2411                 struct lmv_tgt_desc *tmp;
2412
2413                 LASSERT(op_data->op_name != NULL &&
2414                         op_data->op_namelen != 0);
2415
2416                 tmp = lmv_locate_target_for_name(lmv, lsm,
2417                                                  op_data->op_name,
2418                                                  op_data->op_namelen,
2419                                                  &op_data->op_fid1,
2420                                                  &op_data->op_mds);
2421
2422                 /* return -EBADFD means unknown hash type, might
2423                  * need try all sub-stripe here */
2424                 if (IS_ERR(tmp) && PTR_ERR(tmp) != -EBADFD)
2425                         RETURN(PTR_ERR(tmp));
2426
2427                 /* Note: both migrating dir and unknown hash dir need to
2428                  * try all of sub-stripes, so we need start search the
2429                  * name from stripe 0, but migrating dir is already handled
2430                  * inside lmv_locate_target_for_name(), so we only check
2431                  * unknown hash type directory here */
2432                 if (!lmv_is_known_hash_type(lsm->lsm_md_hash_type)) {
2433                         struct lmv_oinfo *oinfo;
2434
2435                         oinfo = &lsm->lsm_md_oinfo[stripe_index];
2436
2437                         op_data->op_fid1 = oinfo->lmo_fid;
2438                         op_data->op_mds = oinfo->lmo_mds;
2439                 }
2440         }
2441
2442 try_next_stripe:
2443         /* Send unlink requests to the MDT where the child is located */
2444         if (likely(!fid_is_zero(&op_data->op_fid2)))
2445                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
2446         else if (lsm != NULL)
2447                 tgt = lmv_get_target(lmv, op_data->op_mds, NULL);
2448         else
2449                 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
2450
2451         if (IS_ERR(tgt))
2452                 RETURN(PTR_ERR(tgt));
2453
2454         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2455         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2456         op_data->op_cap = cfs_curproc_cap_pack();
2457
2458         /*
2459          * If child's fid is given, cancel unused locks for it if it is from
2460          * another export than parent.
2461          *
2462          * LOOKUP lock for child (fid3) should also be cancelled on parent
2463          * tgt_tgt in mdc_unlink().
2464          */
2465         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2466
2467         /*
2468          * Cancel FULL locks on child (fid3).
2469          */
2470         parent_tgt = lmv_find_target(lmv, &op_data->op_fid1);
2471         if (IS_ERR(parent_tgt))
2472                 RETURN(PTR_ERR(parent_tgt));
2473
2474         if (parent_tgt != tgt) {
2475                 rc = lmv_early_cancel(exp, parent_tgt, op_data, tgt->ltd_idx,
2476                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2477                                       MF_MDC_CANCEL_FID3);
2478         }
2479
2480         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_idx, LCK_EX,
2481                               MDS_INODELOCK_FULL, MF_MDC_CANCEL_FID3);
2482         if (rc != 0)
2483                 RETURN(rc);
2484
2485         CDEBUG(D_INODE, "unlink with fid="DFID"/"DFID" -> mds #%u\n",
2486                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2), tgt->ltd_idx);
2487
2488         rc = md_unlink(tgt->ltd_exp, op_data, request);
2489         if (rc != 0 && rc != -EREMOTE && rc != -ENOENT)
2490                 RETURN(rc);
2491
2492         /* Try next stripe if it is needed. */
2493         if (rc == -ENOENT && lsm != NULL && lmv_need_try_all_stripes(lsm)) {
2494                 struct lmv_oinfo *oinfo;
2495
2496                 stripe_index++;
2497                 if (stripe_index >= lsm->lsm_md_stripe_count)
2498                         RETURN(rc);
2499
2500                 oinfo = &lsm->lsm_md_oinfo[stripe_index];
2501
2502                 op_data->op_fid1 = oinfo->lmo_fid;
2503                 op_data->op_mds = oinfo->lmo_mds;
2504
2505                 ptlrpc_req_finished(*request);
2506                 *request = NULL;
2507
2508                 goto try_next_stripe;
2509         }
2510
2511         body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
2512         if (body == NULL)
2513                 RETURN(-EPROTO);
2514
2515         /* Not cross-ref case, just get out of here. */
2516         if (likely(!(body->mbo_valid & OBD_MD_MDS)))
2517                 RETURN(rc);
2518
2519         CDEBUG(D_INODE, "%s: try unlink to another MDT for "DFID"\n",
2520                exp->exp_obd->obd_name, PFID(&body->mbo_fid1));
2521
2522         /* This is a remote object, try remote MDT, Note: it may
2523          * try more than 1 time here, Considering following case
2524          * /mnt/lustre is root on MDT0, remote1 is on MDT1
2525          * 1. Initially A does not know where remote1 is, it send
2526          *    unlink RPC to MDT0, MDT0 return -EREMOTE, it will
2527          *    resend unlink RPC to MDT1 (retry 1st time).
2528          *
2529          * 2. During the unlink RPC in flight,
2530          *    client B mv /mnt/lustre/remote1 /mnt/lustre/remote2
2531          *    and create new remote1, but on MDT0
2532          *
2533          * 3. MDT1 get unlink RPC(from A), then do remote lock on
2534          *    /mnt/lustre, then lookup get fid of remote1, and find
2535          *    it is remote dir again, and replay -EREMOTE again.
2536          *
2537          * 4. Then A will resend unlink RPC to MDT0. (retry 2nd times).
2538          *
2539          * In theory, it might try unlimited time here, but it should
2540          * be very rare case.  */
2541         op_data->op_fid2 = body->mbo_fid1;
2542         ptlrpc_req_finished(*request);
2543         *request = NULL;
2544
2545         goto retry_unlink;
2546 }
2547
2548 static int lmv_precleanup(struct obd_device *obd)
2549 {
2550         ENTRY;
2551         fld_client_proc_fini(&obd->u.lmv.lmv_fld);
2552         lprocfs_obd_cleanup(obd);
2553         lprocfs_free_md_stats(obd);
2554         RETURN(0);
2555 }
2556
2557 /**
2558  * Get by key a value associated with a LMV device.
2559  *
2560  * Dispatch request to lower-layer devices as needed.
2561  *
2562  * \param[in] env               execution environment for this thread
2563  * \param[in] exp               export for the LMV device
2564  * \param[in] keylen            length of key identifier
2565  * \param[in] key               identifier of key to get value for
2566  * \param[in] vallen            size of \a val
2567  * \param[out] val              pointer to storage location for value
2568  * \param[in] lsm               optional striping metadata of object
2569  *
2570  * \retval 0            on success
2571  * \retval negative     negated errno on failure
2572  */
2573 static int lmv_get_info(const struct lu_env *env, struct obd_export *exp,
2574                         __u32 keylen, void *key, __u32 *vallen, void *val)
2575 {
2576         struct obd_device       *obd;
2577         struct lmv_obd          *lmv;
2578         int                      rc = 0;
2579         ENTRY;
2580
2581         obd = class_exp2obd(exp);
2582         if (obd == NULL) {
2583                 CDEBUG(D_IOCTL, "Invalid client cookie %#llx\n",
2584                        exp->exp_handle.h_cookie);
2585                 RETURN(-EINVAL);
2586         }
2587
2588         lmv = &obd->u.lmv;
2589         if (keylen >= strlen("remote_flag") && !strcmp(key, "remote_flag")) {
2590                 int i;
2591
2592                 LASSERT(*vallen == sizeof(__u32));
2593                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2594                         struct lmv_tgt_desc *tgt = lmv->tgts[i];
2595                         /*
2596                          * All tgts should be connected when this gets called.
2597                          */
2598                         if (tgt == NULL || tgt->ltd_exp == NULL)
2599                                 continue;
2600
2601                         if (!obd_get_info(env, tgt->ltd_exp, keylen, key,
2602                                           vallen, val))
2603                                 RETURN(0);
2604                 }
2605                 RETURN(-EINVAL);
2606         } else if (KEY_IS(KEY_MAX_EASIZE) ||
2607                    KEY_IS(KEY_DEFAULT_EASIZE) ||
2608                    KEY_IS(KEY_CONN_DATA)) {
2609                 /*
2610                  * Forwarding this request to first MDS, it should know LOV
2611                  * desc.
2612                  */
2613                 rc = obd_get_info(env, lmv->tgts[0]->ltd_exp, keylen, key,
2614                                   vallen, val);
2615                 if (!rc && KEY_IS(KEY_CONN_DATA))
2616                         exp->exp_connect_data = *(struct obd_connect_data *)val;
2617                 RETURN(rc);
2618         } else if (KEY_IS(KEY_TGT_COUNT)) {
2619                 *((int *)val) = lmv->desc.ld_tgt_count;
2620                 RETURN(0);
2621         }
2622
2623         CDEBUG(D_IOCTL, "Invalid key\n");
2624         RETURN(-EINVAL);
2625 }
2626
2627 /**
2628  * Asynchronously set by key a value associated with a LMV device.
2629  *
2630  * Dispatch request to lower-layer devices as needed.
2631  *
2632  * \param[in] env       execution environment for this thread
2633  * \param[in] exp       export for the LMV device
2634  * \param[in] keylen    length of key identifier
2635  * \param[in] key       identifier of key to store value for
2636  * \param[in] vallen    size of value to store
2637  * \param[in] val       pointer to data to be stored
2638  * \param[in] set       optional list of related ptlrpc requests
2639  *
2640  * \retval 0            on success
2641  * \retval negative     negated errno on failure
2642  */
2643 int lmv_set_info_async(const struct lu_env *env, struct obd_export *exp,
2644                         __u32 keylen, void *key, __u32 vallen, void *val,
2645                         struct ptlrpc_request_set *set)
2646 {
2647         struct lmv_tgt_desc     *tgt = NULL;
2648         struct obd_device       *obd;
2649         struct lmv_obd          *lmv;
2650         int rc = 0;
2651         ENTRY;
2652
2653         obd = class_exp2obd(exp);
2654         if (obd == NULL) {
2655                 CDEBUG(D_IOCTL, "Invalid client cookie %#llx\n",
2656                        exp->exp_handle.h_cookie);
2657                 RETURN(-EINVAL);
2658         }
2659         lmv = &obd->u.lmv;
2660
2661         if (KEY_IS(KEY_READ_ONLY) || KEY_IS(KEY_FLUSH_CTX) ||
2662             KEY_IS(KEY_DEFAULT_EASIZE)) {
2663                 int i, err = 0;
2664
2665                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2666                         tgt = lmv->tgts[i];
2667
2668                         if (tgt == NULL || tgt->ltd_exp == NULL)
2669                                 continue;
2670
2671                         err = obd_set_info_async(env, tgt->ltd_exp,
2672                                                  keylen, key, vallen, val, set);
2673                         if (err && rc == 0)
2674                                 rc = err;
2675                 }
2676
2677                 RETURN(rc);
2678         }
2679
2680         RETURN(-EINVAL);
2681 }
2682
2683 static int lmv_unpack_md_v1(struct obd_export *exp, struct lmv_stripe_md *lsm,
2684                             const struct lmv_mds_md_v1 *lmm1)
2685 {
2686         struct lmv_obd  *lmv = &exp->exp_obd->u.lmv;
2687         int             stripe_count;
2688         int             cplen;
2689         int             i;
2690         int             rc = 0;
2691         ENTRY;
2692
2693         lsm->lsm_md_magic = le32_to_cpu(lmm1->lmv_magic);
2694         lsm->lsm_md_stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
2695         lsm->lsm_md_master_mdt_index = le32_to_cpu(lmm1->lmv_master_mdt_index);
2696         if (OBD_FAIL_CHECK(OBD_FAIL_UNKNOWN_LMV_STRIPE))
2697                 lsm->lsm_md_hash_type = LMV_HASH_TYPE_UNKNOWN;
2698         else
2699                 lsm->lsm_md_hash_type = le32_to_cpu(lmm1->lmv_hash_type);
2700         lsm->lsm_md_layout_version = le32_to_cpu(lmm1->lmv_layout_version);
2701         cplen = strlcpy(lsm->lsm_md_pool_name, lmm1->lmv_pool_name,
2702                         sizeof(lsm->lsm_md_pool_name));
2703
2704         if (cplen >= sizeof(lsm->lsm_md_pool_name))
2705                 RETURN(-E2BIG);
2706
2707         CDEBUG(D_INFO, "unpack lsm count %d, master %d hash_type %d"
2708                "layout_version %d\n", lsm->lsm_md_stripe_count,
2709                lsm->lsm_md_master_mdt_index, lsm->lsm_md_hash_type,
2710                lsm->lsm_md_layout_version);
2711
2712         stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
2713         for (i = 0; i < stripe_count; i++) {
2714                 fid_le_to_cpu(&lsm->lsm_md_oinfo[i].lmo_fid,
2715                               &lmm1->lmv_stripe_fids[i]);
2716                 rc = lmv_fld_lookup(lmv, &lsm->lsm_md_oinfo[i].lmo_fid,
2717                                     &lsm->lsm_md_oinfo[i].lmo_mds);
2718                 if (rc != 0)
2719                         RETURN(rc);
2720                 CDEBUG(D_INFO, "unpack fid #%d "DFID"\n", i,
2721                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid));
2722         }
2723
2724         RETURN(rc);
2725 }
2726
2727 static int lmv_unpackmd(struct obd_export *exp, struct lmv_stripe_md **lsmp,
2728                         const union lmv_mds_md *lmm, size_t lmm_size)
2729 {
2730         struct lmv_stripe_md     *lsm;
2731         int                      lsm_size;
2732         int                      rc;
2733         bool                     allocated = false;
2734         ENTRY;
2735
2736         LASSERT(lsmp != NULL);
2737
2738         lsm = *lsmp;
2739         /* Free memmd */
2740         if (lsm != NULL && lmm == NULL) {
2741                 int i;
2742                 for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
2743                         /* For migrating inode, the master stripe and master
2744                          * object will be the same, so do not need iput, see
2745                          * ll_update_lsm_md */
2746                         if (!(lsm->lsm_md_hash_type & LMV_HASH_FLAG_MIGRATION &&
2747                               i == 0) && lsm->lsm_md_oinfo[i].lmo_root != NULL)
2748                                 iput(lsm->lsm_md_oinfo[i].lmo_root);
2749                 }
2750                 lsm_size = lmv_stripe_md_size(lsm->lsm_md_stripe_count);
2751                 OBD_FREE(lsm, lsm_size);
2752                 *lsmp = NULL;
2753                 RETURN(0);
2754         }
2755
2756         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE)
2757                 RETURN(-EPERM);
2758
2759         /* Unpack memmd */
2760         if (le32_to_cpu(lmm->lmv_magic) != LMV_MAGIC_V1 &&
2761             le32_to_cpu(lmm->lmv_magic) != LMV_USER_MAGIC) {
2762                 CERROR("%s: invalid lmv magic %x: rc = %d\n",
2763                        exp->exp_obd->obd_name, le32_to_cpu(lmm->lmv_magic),
2764                        -EIO);
2765                 RETURN(-EIO);
2766         }
2767
2768         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_V1)
2769                 lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
2770         else
2771                 /**
2772                  * Unpack default dirstripe(lmv_user_md) to lmv_stripe_md,
2773                  * stripecount should be 0 then.
2774                  */
2775                 lsm_size = lmv_stripe_md_size(0);
2776
2777         lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
2778         if (lsm == NULL) {
2779                 OBD_ALLOC(lsm, lsm_size);
2780                 if (lsm == NULL)
2781                         RETURN(-ENOMEM);
2782                 allocated = true;
2783                 *lsmp = lsm;
2784         }
2785
2786         switch (le32_to_cpu(lmm->lmv_magic)) {
2787         case LMV_MAGIC_V1:
2788                 rc = lmv_unpack_md_v1(exp, lsm, &lmm->lmv_md_v1);
2789                 break;
2790         default:
2791                 CERROR("%s: unrecognized magic %x\n", exp->exp_obd->obd_name,
2792                        le32_to_cpu(lmm->lmv_magic));
2793                 rc = -EINVAL;
2794                 break;
2795         }
2796
2797         if (rc != 0 && allocated) {
2798                 OBD_FREE(lsm, lsm_size);
2799                 *lsmp = NULL;
2800                 lsm_size = rc;
2801         }
2802         RETURN(lsm_size);
2803 }
2804
2805 void lmv_free_memmd(struct lmv_stripe_md *lsm)
2806 {
2807         lmv_unpackmd(NULL, &lsm, NULL, 0);
2808 }
2809 EXPORT_SYMBOL(lmv_free_memmd);
2810
2811 static int lmv_cancel_unused(struct obd_export *exp, const struct lu_fid *fid,
2812                              union ldlm_policy_data *policy,
2813                              enum ldlm_mode mode, enum ldlm_cancel_flags flags,
2814                              void *opaque)
2815 {
2816         struct lmv_obd *lmv = &exp->exp_obd->u.lmv;
2817         int rc = 0;
2818         __u32 i;
2819         ENTRY;
2820
2821         LASSERT(fid != NULL);
2822
2823         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2824                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
2825                 int err;
2826
2827                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
2828                         continue;
2829
2830                 err = md_cancel_unused(tgt->ltd_exp, fid, policy, mode, flags,
2831                                        opaque);
2832                 if (!rc)
2833                         rc = err;
2834         }
2835         RETURN(rc);
2836 }
2837
2838 static int lmv_set_lock_data(struct obd_export *exp,
2839                              const struct lustre_handle *lockh,
2840                              void *data, __u64 *bits)
2841 {
2842         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
2843         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
2844         int                      rc;
2845         ENTRY;
2846
2847         if (tgt == NULL || tgt->ltd_exp == NULL)
2848                 RETURN(-EINVAL);
2849         rc =  md_set_lock_data(tgt->ltd_exp, lockh, data, bits);
2850         RETURN(rc);
2851 }
2852
2853 enum ldlm_mode lmv_lock_match(struct obd_export *exp, __u64 flags,
2854                               const struct lu_fid *fid, enum ldlm_type type,
2855                               union ldlm_policy_data *policy,
2856                               enum ldlm_mode mode, struct lustre_handle *lockh)
2857 {
2858         struct obd_device       *obd = exp->exp_obd;
2859         struct lmv_obd          *lmv = &obd->u.lmv;
2860         enum ldlm_mode          rc;
2861         int                     tgt;
2862         int                     i;
2863         ENTRY;
2864
2865         CDEBUG(D_INODE, "Lock match for "DFID"\n", PFID(fid));
2866
2867         /*
2868          * With DNE every object can have two locks in different namespaces:
2869          * lookup lock in space of MDT storing direntry and update/open lock in
2870          * space of MDT storing inode.  Try the MDT that the FID maps to first,
2871          * since this can be easily found, and only try others if that fails.
2872          */
2873         for (i = 0, tgt = lmv_find_target_index(lmv, fid);
2874              i < lmv->desc.ld_tgt_count;
2875              i++, tgt = (tgt + 1) % lmv->desc.ld_tgt_count) {
2876                 if (tgt < 0) {
2877                         CDEBUG(D_HA, "%s: "DFID" is inaccessible: rc = %d\n",
2878                                obd->obd_name, PFID(fid), tgt);
2879                         tgt = 0;
2880                 }
2881
2882                 if (lmv->tgts[tgt] == NULL ||
2883                     lmv->tgts[tgt]->ltd_exp == NULL ||
2884                     lmv->tgts[tgt]->ltd_active == 0)
2885                         continue;
2886
2887                 rc = md_lock_match(lmv->tgts[tgt]->ltd_exp, flags, fid,
2888                                    type, policy, mode, lockh);
2889                 if (rc)
2890                         RETURN(rc);
2891         }
2892
2893         RETURN(0);
2894 }
2895
2896 int lmv_get_lustre_md(struct obd_export *exp, struct ptlrpc_request *req,
2897                       struct obd_export *dt_exp, struct obd_export *md_exp,
2898                       struct lustre_md *md)
2899 {
2900         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
2901         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
2902
2903         if (tgt == NULL || tgt->ltd_exp == NULL)
2904                 RETURN(-EINVAL);
2905
2906         return md_get_lustre_md(lmv->tgts[0]->ltd_exp, req, dt_exp, md_exp, md);
2907 }
2908
2909 int lmv_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
2910 {
2911         struct obd_device       *obd = exp->exp_obd;
2912         struct lmv_obd          *lmv = &obd->u.lmv;
2913         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
2914         ENTRY;
2915
2916         if (md->lmv != NULL) {
2917                 lmv_free_memmd(md->lmv);
2918                 md->lmv = NULL;
2919         }
2920         if (tgt == NULL || tgt->ltd_exp == NULL)
2921                 RETURN(-EINVAL);
2922         RETURN(md_free_lustre_md(lmv->tgts[0]->ltd_exp, md));
2923 }
2924
2925 int lmv_set_open_replay_data(struct obd_export *exp,
2926                              struct obd_client_handle *och,
2927                              struct lookup_intent *it)
2928 {
2929         struct obd_device       *obd = exp->exp_obd;
2930         struct lmv_obd          *lmv = &obd->u.lmv;
2931         struct lmv_tgt_desc     *tgt;
2932         ENTRY;
2933
2934         tgt = lmv_find_target(lmv, &och->och_fid);
2935         if (IS_ERR(tgt))
2936                 RETURN(PTR_ERR(tgt));
2937
2938         RETURN(md_set_open_replay_data(tgt->ltd_exp, och, it));
2939 }
2940
2941 int lmv_clear_open_replay_data(struct obd_export *exp,
2942                                struct obd_client_handle *och)
2943 {
2944         struct obd_device       *obd = exp->exp_obd;
2945         struct lmv_obd          *lmv = &obd->u.lmv;
2946         struct lmv_tgt_desc     *tgt;
2947         ENTRY;
2948
2949         tgt = lmv_find_target(lmv, &och->och_fid);
2950         if (IS_ERR(tgt))
2951                 RETURN(PTR_ERR(tgt));
2952
2953         RETURN(md_clear_open_replay_data(tgt->ltd_exp, och));
2954 }
2955
2956 int lmv_intent_getattr_async(struct obd_export *exp,
2957                              struct md_enqueue_info *minfo)
2958 {
2959         struct md_op_data       *op_data = &minfo->mi_data;
2960         struct obd_device       *obd = exp->exp_obd;
2961         struct lmv_obd          *lmv = &obd->u.lmv;
2962         struct lmv_tgt_desc     *ptgt = NULL;
2963         struct lmv_tgt_desc     *ctgt = NULL;
2964         int                      rc;
2965         ENTRY;
2966
2967         if (!fid_is_sane(&op_data->op_fid2))
2968                 RETURN(-EINVAL);
2969
2970         ptgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
2971         if (IS_ERR(ptgt))
2972                 RETURN(PTR_ERR(ptgt));
2973
2974         ctgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid2);
2975         if (IS_ERR(ctgt))
2976                 RETURN(PTR_ERR(ctgt));
2977
2978         /*
2979          * if child is on remote MDT, we need 2 async RPCs to fetch both LOOKUP
2980          * lock on parent, and UPDATE lock on child MDT, which makes all
2981          * complicated. Considering remote dir is rare case, and not supporting
2982          * it in statahead won't cause any issue, drop its support for now.
2983          */
2984         if (ptgt != ctgt)
2985                 RETURN(-ENOTSUPP);
2986
2987         rc = md_intent_getattr_async(ptgt->ltd_exp, minfo);
2988         RETURN(rc);
2989 }
2990
2991 int lmv_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
2992                         struct lu_fid *fid, __u64 *bits)
2993 {
2994         struct obd_device       *obd = exp->exp_obd;
2995         struct lmv_obd          *lmv = &obd->u.lmv;
2996         struct lmv_tgt_desc     *tgt;
2997         int                      rc;
2998         ENTRY;
2999
3000         tgt = lmv_find_target(lmv, fid);
3001         if (IS_ERR(tgt))
3002                 RETURN(PTR_ERR(tgt));
3003
3004         rc = md_revalidate_lock(tgt->ltd_exp, it, fid, bits);
3005         RETURN(rc);
3006 }
3007
3008 int lmv_get_fid_from_lsm(struct obd_export *exp,
3009                          const struct lmv_stripe_md *lsm,
3010                          const char *name, int namelen, struct lu_fid *fid)
3011 {
3012         const struct lmv_oinfo *oinfo;
3013
3014         LASSERT(lsm != NULL);
3015         oinfo = lsm_name_to_stripe_info(lsm, name, namelen);
3016         if (IS_ERR(oinfo))
3017                 return PTR_ERR(oinfo);
3018
3019         *fid = oinfo->lmo_fid;
3020
3021         RETURN(0);
3022 }
3023
3024 /**
3025  * For lmv, only need to send request to master MDT, and the master MDT will
3026  * process with other slave MDTs. The only exception is Q_GETOQUOTA for which
3027  * we directly fetch data from the slave MDTs.
3028  */
3029 int lmv_quotactl(struct obd_device *unused, struct obd_export *exp,
3030                  struct obd_quotactl *oqctl)
3031 {
3032         struct obd_device   *obd = class_exp2obd(exp);
3033         struct lmv_obd      *lmv = &obd->u.lmv;
3034         struct lmv_tgt_desc *tgt = lmv->tgts[0];
3035         int                  rc = 0;
3036         __u32                i;
3037         __u64                curspace, curinodes;
3038         ENTRY;
3039
3040         if (tgt == NULL ||
3041             tgt->ltd_exp == NULL ||
3042             !tgt->ltd_active ||
3043             lmv->desc.ld_tgt_count == 0) {
3044                 CERROR("master lmv inactive\n");
3045                 RETURN(-EIO);
3046         }
3047
3048         if (oqctl->qc_cmd != Q_GETOQUOTA) {
3049                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
3050                 RETURN(rc);
3051         }
3052
3053         curspace = curinodes = 0;
3054         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3055                 int err;
3056                 tgt = lmv->tgts[i];
3057
3058                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
3059                         continue;
3060
3061                 err = obd_quotactl(tgt->ltd_exp, oqctl);
3062                 if (err) {
3063                         CERROR("getquota on mdt %d failed. %d\n", i, err);
3064                         if (!rc)
3065                                 rc = err;
3066                 } else {
3067                         curspace += oqctl->qc_dqblk.dqb_curspace;
3068                         curinodes += oqctl->qc_dqblk.dqb_curinodes;
3069                 }
3070         }
3071         oqctl->qc_dqblk.dqb_curspace = curspace;
3072         oqctl->qc_dqblk.dqb_curinodes = curinodes;
3073
3074         RETURN(rc);
3075 }
3076
3077 static int lmv_merge_attr(struct obd_export *exp,
3078                           const struct lmv_stripe_md *lsm,
3079                           struct cl_attr *attr,
3080                           ldlm_blocking_callback cb_blocking)
3081 {
3082         int rc;
3083         int i;
3084
3085         rc = lmv_revalidate_slaves(exp, lsm, cb_blocking, 0);
3086         if (rc < 0)
3087                 return rc;
3088
3089         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
3090                 struct inode *inode = lsm->lsm_md_oinfo[i].lmo_root;
3091
3092                 CDEBUG(D_INFO, ""DFID" size %llu, blocks %llu nlink %u,"
3093                        " atime %lu ctime %lu, mtime %lu.\n",
3094                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid),
3095                        i_size_read(inode), (unsigned long long)inode->i_blocks,
3096                        inode->i_nlink, LTIME_S(inode->i_atime),
3097                        LTIME_S(inode->i_ctime), LTIME_S(inode->i_mtime));
3098
3099                 /* for slave stripe, it needs to subtract nlink for . and .. */
3100                 if (i != 0)
3101                         attr->cat_nlink += inode->i_nlink - 2;
3102                 else
3103                         attr->cat_nlink = inode->i_nlink;
3104
3105                 attr->cat_size += i_size_read(inode);
3106                 attr->cat_blocks += inode->i_blocks;
3107
3108                 if (attr->cat_atime < LTIME_S(inode->i_atime))
3109                         attr->cat_atime = LTIME_S(inode->i_atime);
3110
3111                 if (attr->cat_ctime < LTIME_S(inode->i_ctime))
3112                         attr->cat_ctime = LTIME_S(inode->i_ctime);
3113
3114                 if (attr->cat_mtime < LTIME_S(inode->i_mtime))
3115                         attr->cat_mtime = LTIME_S(inode->i_mtime);
3116         }
3117         return 0;
3118 }
3119
3120 struct obd_ops lmv_obd_ops = {
3121         .o_owner                = THIS_MODULE,
3122         .o_setup                = lmv_setup,
3123         .o_cleanup              = lmv_cleanup,
3124         .o_precleanup           = lmv_precleanup,
3125         .o_process_config       = lmv_process_config,
3126         .o_connect              = lmv_connect,
3127         .o_disconnect           = lmv_disconnect,
3128         .o_statfs               = lmv_statfs,
3129         .o_get_info             = lmv_get_info,
3130         .o_set_info_async       = lmv_set_info_async,
3131         .o_notify               = lmv_notify,
3132         .o_get_uuid             = lmv_get_uuid,
3133         .o_iocontrol            = lmv_iocontrol,
3134         .o_quotactl             = lmv_quotactl
3135 };
3136
3137 struct md_ops lmv_md_ops = {
3138         .m_get_root             = lmv_get_root,
3139         .m_null_inode           = lmv_null_inode,
3140         .m_close                = lmv_close,
3141         .m_create               = lmv_create,
3142         .m_enqueue              = lmv_enqueue,
3143         .m_getattr              = lmv_getattr,
3144         .m_getxattr             = lmv_getxattr,
3145         .m_getattr_name         = lmv_getattr_name,
3146         .m_intent_lock          = lmv_intent_lock,
3147         .m_link                 = lmv_link,
3148         .m_rename               = lmv_rename,
3149         .m_setattr              = lmv_setattr,
3150         .m_setxattr             = lmv_setxattr,
3151         .m_fsync                = lmv_fsync,
3152         .m_read_page            = lmv_read_page,
3153         .m_unlink               = lmv_unlink,
3154         .m_init_ea_size         = lmv_init_ea_size,
3155         .m_cancel_unused        = lmv_cancel_unused,
3156         .m_set_lock_data        = lmv_set_lock_data,
3157         .m_lock_match           = lmv_lock_match,
3158         .m_get_lustre_md        = lmv_get_lustre_md,
3159         .m_free_lustre_md       = lmv_free_lustre_md,
3160         .m_merge_attr           = lmv_merge_attr,
3161         .m_set_open_replay_data = lmv_set_open_replay_data,
3162         .m_clear_open_replay_data = lmv_clear_open_replay_data,
3163         .m_intent_getattr_async = lmv_intent_getattr_async,
3164         .m_revalidate_lock      = lmv_revalidate_lock,
3165         .m_get_fid_from_lsm     = lmv_get_fid_from_lsm,
3166         .m_unpackmd             = lmv_unpackmd,
3167 };
3168
3169 static int __init lmv_init(void)
3170 {
3171         return class_register_type(&lmv_obd_ops, &lmv_md_ops, true, NULL,
3172                                    LUSTRE_LMV_NAME, NULL);
3173 }
3174
3175 static void __exit lmv_exit(void)
3176 {
3177         class_unregister_type(LUSTRE_LMV_NAME);
3178 }
3179
3180 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
3181 MODULE_DESCRIPTION("Lustre Logical Metadata Volume");
3182 MODULE_VERSION(LUSTRE_VERSION_STRING);
3183 MODULE_LICENSE("GPL");
3184
3185 module_init(lmv_init);
3186 module_exit(lmv_exit);