lustre/lmv/lmv_obd.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2013, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_LMV
  38 #include <linux/slab.h>
  39 #include <linux/module.h>
  40 #include <linux/init.h>
  41 #include <linux/slab.h>
  42 #include <linux/pagemap.h>
  43 #include <linux/mm.h>
  44 #include <linux/math64.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/namei.h>
  47
  48 #include <lustre/lustre_idl.h>
  49 #include <obd_support.h>
  50 #include <lustre_lib.h>
  51 #include <lustre_net.h>
  52 #include <obd_class.h>
  53 #include <lustre_lmv.h>
  54 #include <lprocfs_status.h>
  55 #include <cl_object.h>
  56 #include <lclient.h>
  57 #include <lustre_lite.h>
  58 #include <lustre_fid.h>
  59 #include <lustre_ioctl.h>
  60 #include "lmv_internal.h"
  61
  62 /* This hash is only for testing purpose */
  63 static inline unsigned int
  64 lmv_hash_all_chars(unsigned int count, const char *name, int namelen)
  65 {
  66         unsigned int c = 0;
  67         const unsigned char *p = (const unsigned char *)name;
  68
  69         while (--namelen >= 0)
  70                 c += p[namelen];
  71
  72         c = c % count;
  73
  74         return c;
  75 }
  76
  77 static inline unsigned int
  78 lmv_hash_fnv1a(unsigned int count, const char *name, int namelen)
  79 {
  80         __u64   hash;
  81
  82         hash = lustre_hash_fnv_1a_64(name, namelen);
  83
  84         hash = hash % count;
  85
  86         return hash;
  87 }
  88
  89 int lmv_name_to_stripe_index(__u32 lmv_hash_type, unsigned int stripe_count,
  90                              const char *name, int namelen)
  91 {
  92         int     idx;
  93         __u32   hash_type = lmv_hash_type & LMV_HASH_TYPE_MASK;
  94
  95         LASSERT(namelen > 0);
  96         if (stripe_count <= 1)
  97                 return 0;
  98
  99         /* for migrating object, always start from 0 stripe */
 100         if (lmv_hash_type & LMV_HASH_FLAG_MIGRATION)
 101                 return 0;
 102
 103         switch (hash_type) {
 104         case LMV_HASH_TYPE_ALL_CHARS:
 105                 idx = lmv_hash_all_chars(stripe_count, name, namelen);
 106                 break;
 107         case LMV_HASH_TYPE_FNV_1A_64:
 108                 idx = lmv_hash_fnv1a(stripe_count, name, namelen);
 109                 break;
 110         default:
 111                 idx = -EBADFD;
 112                 break;
 113         }
 114
 115         CDEBUG(D_INFO, "name %.*s hash_type %d idx %d\n", namelen, name,
 116                hash_type, idx);
 117
 118         return idx;
 119 }
 120
 121 static void lmv_activate_target(struct lmv_obd *lmv,
 122                                 struct lmv_tgt_desc *tgt,
 123                                 int activate)
 124 {
 125         if (tgt->ltd_active == activate)
 126                 return;
 127
 128         tgt->ltd_active = activate;
 129         lmv->desc.ld_active_tgt_count += (activate ? 1 : -1);
 130 }
 131
 132 /**
 133  * Error codes:
 134  *
 135  *  -EINVAL  : UUID can't be found in the LMV's target list
 136  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
 137  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
 138  */
 139 static int lmv_set_mdc_active(struct lmv_obd *lmv,
 140                               const struct obd_uuid *uuid,
 141                               int activate)
 142 {
 143         struct lmv_tgt_desc     *tgt = NULL;
 144         struct obd_device       *obd;
 145         __u32                    i;
 146         int                      rc = 0;
 147         ENTRY;
 148
 149         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
 150                         lmv, uuid->uuid, activate);
 151
 152         spin_lock(&lmv->lmv_lock);
 153         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 154                 tgt = lmv->tgts[i];
 155                 if (tgt == NULL || tgt->ltd_exp == NULL)
 156                         continue;
 157
 158                 CDEBUG(D_INFO, "Target idx %d is %s conn "LPX64"\n", i,
 159                        tgt->ltd_uuid.uuid, tgt->ltd_exp->exp_handle.h_cookie);
 160
 161                 if (obd_uuid_equals(uuid, &tgt->ltd_uuid))
 162                         break;
 163         }
 164
 165         if (i == lmv->desc.ld_tgt_count)
 166                 GOTO(out_lmv_lock, rc = -EINVAL);
 167
 168         obd = class_exp2obd(tgt->ltd_exp);
 169         if (obd == NULL)
 170                 GOTO(out_lmv_lock, rc = -ENOTCONN);
 171
 172         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
 173                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
 174                obd->obd_type->typ_name, i);
 175         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0);
 176
 177         if (tgt->ltd_active == activate) {
 178                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
 179                        activate ? "" : "in");
 180                 GOTO(out_lmv_lock, rc);
 181         }
 182
 183         CDEBUG(D_INFO, "Marking OBD %p %sactive\n", obd,
 184                activate ? "" : "in");
 185         lmv_activate_target(lmv, tgt, activate);
 186         EXIT;
 187
 188  out_lmv_lock:
 189         spin_unlock(&lmv->lmv_lock);
 190         return rc;
 191 }
 192
 193 struct obd_uuid *lmv_get_uuid(struct obd_export *exp)
 194 {
 195         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
 196         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
 197
 198         return (tgt == NULL) ? NULL : obd_get_uuid(tgt->ltd_exp);
 199 }
 200
 201 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
 202                       enum obd_notify_event ev, void *data)
 203 {
 204         struct obd_connect_data *conn_data;
 205         struct lmv_obd          *lmv = &obd->u.lmv;
 206         struct obd_uuid         *uuid;
 207         int                      rc = 0;
 208         ENTRY;
 209
 210         if (strcmp(watched->obd_type->typ_name, LUSTRE_MDC_NAME)) {
 211                 CERROR("unexpected notification of %s %s!\n",
 212                        watched->obd_type->typ_name,
 213                        watched->obd_name);
 214                 RETURN(-EINVAL);
 215         }
 216
 217         uuid = &watched->u.cli.cl_target_uuid;
 218         if (ev == OBD_NOTIFY_ACTIVE || ev == OBD_NOTIFY_INACTIVE) {
 219                 /*
 220                  * Set MDC as active before notifying the observer, so the
 221                  * observer can use the MDC normally.
 222                  */
 223                 rc = lmv_set_mdc_active(lmv, uuid,
 224                                         ev == OBD_NOTIFY_ACTIVE);
 225                 if (rc) {
 226                         CERROR("%sactivation of %s failed: %d\n",
 227                                ev == OBD_NOTIFY_ACTIVE ? "" : "de",
 228                                uuid->uuid, rc);
 229                         RETURN(rc);
 230                 }
 231         } else if (ev == OBD_NOTIFY_OCD) {
 232                 conn_data = &watched->u.cli.cl_import->imp_connect_data;
 233                 /*
 234                  * XXX: Make sure that ocd_connect_flags from all targets are
 235                  * the same. Otherwise one of MDTs runs wrong version or
 236                  * something like this.  --umka
 237                  */
 238                 obd->obd_self_export->exp_connect_data = *conn_data;
 239         }
 240 #if 0
 241         else if (ev == OBD_NOTIFY_DISCON) {
 242                 /*
 243                  * For disconnect event, flush fld cache for failout MDS case.
 244                  */
 245                 fld_client_flush(&lmv->lmv_fld);
 246         }
 247 #endif
 248         /*
 249          * Pass the notification up the chain.
 250          */
 251         if (obd->obd_observer)
 252                 rc = obd_notify(obd->obd_observer, watched, ev, data);
 253
 254         RETURN(rc);
 255 }
 256
 257 /**
 258  * This is fake connect function. Its purpose is to initialize lmv and say
 259  * caller that everything is okay. Real connection will be performed later.
 260  */
 261 static int lmv_connect(const struct lu_env *env,
 262                        struct obd_export **exp, struct obd_device *obd,
 263                        struct obd_uuid *cluuid, struct obd_connect_data *data,
 264                        void *localdata)
 265 {
 266         struct lmv_obd        *lmv = &obd->u.lmv;
 267         struct lustre_handle  conn = { 0 };
 268         int                    rc = 0;
 269         ENTRY;
 270
 271         /*
 272          * We don't want to actually do the underlying connections more than
 273          * once, so keep track.
 274          */
 275         lmv->refcount++;
 276         if (lmv->refcount > 1) {
 277                 *exp = NULL;
 278                 RETURN(0);
 279         }
 280
 281         rc = class_connect(&conn, obd, cluuid);
 282         if (rc) {
 283                 CERROR("class_connection() returned %d\n", rc);
 284                 RETURN(rc);
 285         }
 286
 287         *exp = class_conn2export(&conn);
 288         class_export_get(*exp);
 289
 290         lmv->exp = *exp;
 291         lmv->connected = 0;
 292         lmv->cluuid = *cluuid;
 293
 294         if (data)
 295                 lmv->conn_data = *data;
 296
 297         if (lmv->targets_proc_entry == NULL) {
 298                 lmv->targets_proc_entry = lprocfs_seq_register("target_obds",
 299                                                         obd->obd_proc_entry,
 300                                                         NULL, NULL);
 301                 if (IS_ERR(lmv->targets_proc_entry)) {
 302                         CERROR("%s: cannot register "
 303                                "/proc/fs/lustre/%s/%s/target_obds\n",
 304                                obd->obd_name, obd->obd_type->typ_name,
 305                                obd->obd_name);
 306                         lmv->targets_proc_entry = NULL;
 307                 }
 308         }
 309
 310         /*
 311          * All real clients should perform actual connection right away, because
 312          * it is possible, that LMV will not have opportunity to connect targets
 313          * and MDC stuff will be called directly, for instance while reading
 314          * ../mdc/../kbytesfree procfs file, etc.
 315          */
 316         if (data != NULL && (data->ocd_connect_flags & OBD_CONNECT_REAL))
 317                 rc = lmv_check_connect(obd);
 318
 319         if (rc && lmv->targets_proc_entry != NULL)
 320                 lprocfs_remove(&lmv->targets_proc_entry);
 321         RETURN(rc);
 322 }
 323
 324 static void lmv_set_timeouts(struct obd_device *obd)
 325 {
 326         struct lmv_obd          *lmv;
 327         __u32                    i;
 328
 329         lmv = &obd->u.lmv;
 330         if (lmv->server_timeout == 0)
 331                 return;
 332
 333         if (lmv->connected == 0)
 334                 return;
 335
 336         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 337                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 338
 339                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
 340                         continue;
 341
 342                 obd_set_info_async(NULL, tgt->ltd_exp, sizeof(KEY_INTERMDS),
 343                                    KEY_INTERMDS, 0, NULL, NULL);
 344         }
 345 }
 346
 347 static int lmv_init_ea_size(struct obd_export *exp, int easize,
 348                             int def_easize, int cookiesize, int def_cookiesize)
 349 {
 350         struct obd_device       *obd = exp->exp_obd;
 351         struct lmv_obd          *lmv = &obd->u.lmv;
 352         __u32                    i;
 353         int                      rc = 0;
 354         int                      change = 0;
 355         ENTRY;
 356
 357         if (lmv->max_easize < easize) {
 358                 lmv->max_easize = easize;
 359                 change = 1;
 360         }
 361         if (lmv->max_def_easize < def_easize) {
 362                 lmv->max_def_easize = def_easize;
 363                 change = 1;
 364         }
 365         if (lmv->max_cookiesize < cookiesize) {
 366                 lmv->max_cookiesize = cookiesize;
 367                 change = 1;
 368         }
 369         if (lmv->max_def_cookiesize < def_cookiesize) {
 370                 lmv->max_def_cookiesize = def_cookiesize;
 371                 change = 1;
 372         }
 373         if (change == 0)
 374                 RETURN(0);
 375
 376         if (lmv->connected == 0)
 377                 RETURN(0);
 378
 379         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 380                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 381
 382                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active) {
 383                         CWARN("%s: NULL export for %d\n", obd->obd_name, i);
 384                         continue;
 385                 }
 386
 387                 rc = md_init_ea_size(tgt->ltd_exp, easize, def_easize,
 388                                      cookiesize, def_cookiesize);
 389                 if (rc) {
 390                         CERROR("%s: obd_init_ea_size() failed on MDT target %d:"
 391                                " rc = %d\n", obd->obd_name, i, rc);
 392                         break;
 393                 }
 394         }
 395         RETURN(rc);
 396 }
 397
 398 #define MAX_STRING_SIZE 128
 399
 400 int lmv_connect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 401 {
 402         struct lmv_obd          *lmv = &obd->u.lmv;
 403         struct obd_uuid         *cluuid = &lmv->cluuid;
 404         struct obd_uuid          lmv_mdc_uuid = { "LMV_MDC_UUID" };
 405         struct obd_device       *mdc_obd;
 406         struct obd_export       *mdc_exp;
 407         struct lu_fld_target     target;
 408         int                      rc;
 409         ENTRY;
 410
 411         mdc_obd = class_find_client_obd(&tgt->ltd_uuid, LUSTRE_MDC_NAME,
 412                                         &obd->obd_uuid);
 413         if (!mdc_obd) {
 414                 CERROR("target %s not attached\n", tgt->ltd_uuid.uuid);
 415                 RETURN(-EINVAL);
 416         }
 417
 418         CDEBUG(D_CONFIG, "connect to %s(%s) - %s, %s FOR %s\n",
 419                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 420                 tgt->ltd_uuid.uuid, obd->obd_uuid.uuid,
 421                 cluuid->uuid);
 422
 423         if (!mdc_obd->obd_set_up) {
 424                 CERROR("target %s is not set up\n", tgt->ltd_uuid.uuid);
 425                 RETURN(-EINVAL);
 426         }
 427
 428         rc = obd_connect(NULL, &mdc_exp, mdc_obd, &lmv_mdc_uuid,
 429                          &lmv->conn_data, NULL);
 430         if (rc) {
 431                 CERROR("target %s connect error %d\n", tgt->ltd_uuid.uuid, rc);
 432                 RETURN(rc);
 433         }
 434
 435         /*
 436          * Init fid sequence client for this mdc and add new fld target.
 437          */
 438         rc = obd_fid_init(mdc_obd, mdc_exp, LUSTRE_SEQ_METADATA);
 439         if (rc)
 440                 RETURN(rc);
 441
 442         target.ft_srv = NULL;
 443         target.ft_exp = mdc_exp;
 444         target.ft_idx = tgt->ltd_idx;
 445
 446         fld_client_add_target(&lmv->lmv_fld, &target);
 447
 448         rc = obd_register_observer(mdc_obd, obd);
 449         if (rc) {
 450                 obd_disconnect(mdc_exp);
 451                 CERROR("target %s register_observer error %d\n",
 452                        tgt->ltd_uuid.uuid, rc);
 453                 RETURN(rc);
 454         }
 455
 456         if (obd->obd_observer) {
 457                 /*
 458                  * Tell the observer about the new target.
 459                  */
 460                 rc = obd_notify(obd->obd_observer, mdc_exp->exp_obd,
 461                                 OBD_NOTIFY_ACTIVE,
 462                                 (void *)(tgt - lmv->tgts[0]));
 463                 if (rc) {
 464                         obd_disconnect(mdc_exp);
 465                         RETURN(rc);
 466                 }
 467         }
 468
 469         tgt->ltd_active = 1;
 470         tgt->ltd_exp = mdc_exp;
 471         lmv->desc.ld_active_tgt_count++;
 472
 473         md_init_ea_size(tgt->ltd_exp, lmv->max_easize, lmv->max_def_easize,
 474                         lmv->max_cookiesize, lmv->max_def_cookiesize);
 475
 476         CDEBUG(D_CONFIG, "Connected to %s(%s) successfully (%d)\n",
 477                 mdc_obd->obd_name, mdc_obd->obd_uuid.uuid,
 478                 atomic_read(&obd->obd_refcount));
 479
 480         if (lmv->targets_proc_entry != NULL) {
 481                 struct proc_dir_entry *mdc_symlink;
 482
 483                 LASSERT(mdc_obd->obd_type != NULL);
 484                 LASSERT(mdc_obd->obd_type->typ_name != NULL);
 485                 mdc_symlink = lprocfs_add_symlink(mdc_obd->obd_name,
 486                                                   lmv->targets_proc_entry,
 487                                                   "../../../%s/%s",
 488                                                   mdc_obd->obd_type->typ_name,
 489                                                   mdc_obd->obd_name);
 490                 if (mdc_symlink == NULL) {
 491                         CERROR("cannot register LMV target "
 492                                "/proc/fs/lustre/%s/%s/target_obds/%s\n",
 493                                obd->obd_type->typ_name, obd->obd_name,
 494                                mdc_obd->obd_name);
 495                 }
 496         }
 497         RETURN(0);
 498 }
 499
 500 static void lmv_del_target(struct lmv_obd *lmv, int index)
 501 {
 502         if (lmv->tgts[index] == NULL)
 503                 return;
 504
 505         OBD_FREE_PTR(lmv->tgts[index]);
 506         lmv->tgts[index] = NULL;
 507         return;
 508 }
 509
 510 static int lmv_add_target(struct obd_device *obd, struct obd_uuid *uuidp,
 511                            __u32 index, int gen)
 512 {
 513         struct lmv_obd      *lmv = &obd->u.lmv;
 514         struct lmv_tgt_desc *tgt;
 515         int                  orig_tgt_count = 0;
 516         int                  rc = 0;
 517         ENTRY;
 518
 519         CDEBUG(D_CONFIG, "Target uuid: %s. index %d\n", uuidp->uuid, index);
 520
 521         lmv_init_lock(lmv);
 522
 523         if (lmv->desc.ld_tgt_count == 0) {
 524                 struct obd_device *mdc_obd;
 525
 526                 mdc_obd = class_find_client_obd(uuidp, LUSTRE_MDC_NAME,
 527                                                 &obd->obd_uuid);
 528                 if (!mdc_obd) {
 529                         lmv_init_unlock(lmv);
 530                         CERROR("%s: Target %s not attached: rc = %d\n",
 531                                obd->obd_name, uuidp->uuid, -EINVAL);
 532                         RETURN(-EINVAL);
 533                 }
 534         }
 535
 536         if ((index < lmv->tgts_size) && (lmv->tgts[index] != NULL)) {
 537                 tgt = lmv->tgts[index];
 538                 CERROR("%s: UUID %s already assigned at LOV target index %d:"
 539                        " rc = %d\n", obd->obd_name,
 540                        obd_uuid2str(&tgt->ltd_uuid), index, -EEXIST);
 541                 lmv_init_unlock(lmv);
 542                 RETURN(-EEXIST);
 543         }
 544
 545         if (index >= lmv->tgts_size) {
 546                 /* We need to reallocate the lmv target array. */
 547                 struct lmv_tgt_desc **newtgts, **old = NULL;
 548                 __u32 newsize = 1;
 549                 __u32 oldsize = 0;
 550
 551                 while (newsize < index + 1)
 552                         newsize = newsize << 1;
 553                 OBD_ALLOC(newtgts, sizeof(*newtgts) * newsize);
 554                 if (newtgts == NULL) {
 555                         lmv_init_unlock(lmv);
 556                         RETURN(-ENOMEM);
 557                 }
 558
 559                 if (lmv->tgts_size) {
 560                         memcpy(newtgts, lmv->tgts,
 561                                sizeof(*newtgts) * lmv->tgts_size);
 562                         old = lmv->tgts;
 563                         oldsize = lmv->tgts_size;
 564                 }
 565
 566                 lmv->tgts = newtgts;
 567                 lmv->tgts_size = newsize;
 568                 smp_rmb();
 569                 if (old)
 570                         OBD_FREE(old, sizeof(*old) * oldsize);
 571
 572                 CDEBUG(D_CONFIG, "tgts: %p size: %d\n", lmv->tgts,
 573                        lmv->tgts_size);
 574         }
 575
 576         OBD_ALLOC_PTR(tgt);
 577         if (!tgt) {
 578                 lmv_init_unlock(lmv);
 579                 RETURN(-ENOMEM);
 580         }
 581
 582         mutex_init(&tgt->ltd_fid_mutex);
 583         tgt->ltd_idx = index;
 584         tgt->ltd_uuid = *uuidp;
 585         tgt->ltd_active = 0;
 586         lmv->tgts[index] = tgt;
 587         if (index >= lmv->desc.ld_tgt_count) {
 588                 orig_tgt_count = lmv->desc.ld_tgt_count;
 589                 lmv->desc.ld_tgt_count = index + 1;
 590         }
 591
 592         if (lmv->connected) {
 593                 rc = lmv_connect_mdc(obd, tgt);
 594                 if (rc != 0) {
 595                         spin_lock(&lmv->lmv_lock);
 596                         if (lmv->desc.ld_tgt_count == index + 1)
 597                                 lmv->desc.ld_tgt_count = orig_tgt_count;
 598                         memset(tgt, 0, sizeof(*tgt));
 599                         spin_unlock(&lmv->lmv_lock);
 600                 } else {
 601                         int easize = sizeof(struct lmv_stripe_md) +
 602                                 lmv->desc.ld_tgt_count * sizeof(struct lu_fid);
 603                         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0, 0);
 604                 }
 605         }
 606
 607         lmv_init_unlock(lmv);
 608         RETURN(rc);
 609 }
 610
 611 int lmv_check_connect(struct obd_device *obd)
 612 {
 613         struct lmv_obd          *lmv = &obd->u.lmv;
 614         struct lmv_tgt_desc     *tgt;
 615         __u32                    i;
 616         int                      rc;
 617         int                      easize;
 618         ENTRY;
 619
 620         if (lmv->connected)
 621                 RETURN(0);
 622
 623         lmv_init_lock(lmv);
 624         if (lmv->connected) {
 625                 lmv_init_unlock(lmv);
 626                 RETURN(0);
 627         }
 628
 629         if (lmv->desc.ld_tgt_count == 0) {
 630                 lmv_init_unlock(lmv);
 631                 CERROR("%s: no targets configured.\n", obd->obd_name);
 632                 RETURN(-EINVAL);
 633         }
 634
 635         LASSERT(lmv->tgts != NULL);
 636
 637         if (lmv->tgts[0] == NULL) {
 638                 lmv_init_unlock(lmv);
 639                 CERROR("%s: no target configured for index 0.\n",
 640                        obd->obd_name);
 641                 RETURN(-EINVAL);
 642         }
 643
 644         CDEBUG(D_CONFIG, "Time to connect %s to %s\n",
 645                lmv->cluuid.uuid, obd->obd_name);
 646
 647         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 648                 tgt = lmv->tgts[i];
 649                 if (tgt == NULL)
 650                         continue;
 651                 rc = lmv_connect_mdc(obd, tgt);
 652                 if (rc)
 653                         GOTO(out_disc, rc);
 654         }
 655
 656         lmv_set_timeouts(obd);
 657         class_export_put(lmv->exp);
 658         lmv->connected = 1;
 659         easize = lmv_mds_md_size(lmv->desc.ld_tgt_count, LMV_MAGIC);
 660         lmv_init_ea_size(obd->obd_self_export, easize, 0, 0, 0);
 661         lmv_init_unlock(lmv);
 662         RETURN(0);
 663
 664  out_disc:
 665         while (i-- > 0) {
 666                 int rc2;
 667                 tgt = lmv->tgts[i];
 668                 if (tgt == NULL)
 669                         continue;
 670                 tgt->ltd_active = 0;
 671                 if (tgt->ltd_exp) {
 672                         --lmv->desc.ld_active_tgt_count;
 673                         rc2 = obd_disconnect(tgt->ltd_exp);
 674                         if (rc2) {
 675                                 CERROR("LMV target %s disconnect on "
 676                                        "MDC idx %d: error %d\n",
 677                                        tgt->ltd_uuid.uuid, i, rc2);
 678                         }
 679                 }
 680         }
 681         class_disconnect(lmv->exp);
 682         lmv_init_unlock(lmv);
 683         RETURN(rc);
 684 }
 685
 686 static int lmv_disconnect_mdc(struct obd_device *obd, struct lmv_tgt_desc *tgt)
 687 {
 688         struct lmv_obd         *lmv = &obd->u.lmv;
 689         struct obd_device      *mdc_obd;
 690         int                     rc;
 691         ENTRY;
 692
 693         LASSERT(tgt != NULL);
 694         LASSERT(obd != NULL);
 695
 696         mdc_obd = class_exp2obd(tgt->ltd_exp);
 697
 698         if (mdc_obd) {
 699                 mdc_obd->obd_force = obd->obd_force;
 700                 mdc_obd->obd_fail = obd->obd_fail;
 701                 mdc_obd->obd_no_recov = obd->obd_no_recov;
 702         }
 703
 704         if (lmv->targets_proc_entry != NULL)
 705                 lprocfs_remove_proc_entry(mdc_obd->obd_name,
 706                                           lmv->targets_proc_entry);
 707
 708         rc = obd_fid_fini(tgt->ltd_exp->exp_obd);
 709         if (rc)
 710                 CERROR("Can't finanize fids factory\n");
 711
 712         CDEBUG(D_INFO, "Disconnected from %s(%s) successfully\n",
 713                tgt->ltd_exp->exp_obd->obd_name,
 714                tgt->ltd_exp->exp_obd->obd_uuid.uuid);
 715
 716         obd_register_observer(tgt->ltd_exp->exp_obd, NULL);
 717         rc = obd_disconnect(tgt->ltd_exp);
 718         if (rc) {
 719                 if (tgt->ltd_active) {
 720                         CERROR("Target %s disconnect error %d\n",
 721                                tgt->ltd_uuid.uuid, rc);
 722                 }
 723         }
 724
 725         lmv_activate_target(lmv, tgt, 0);
 726         tgt->ltd_exp = NULL;
 727         RETURN(0);
 728 }
 729
 730 static int lmv_disconnect(struct obd_export *exp)
 731 {
 732         struct obd_device       *obd = class_exp2obd(exp);
 733         struct lmv_obd          *lmv = &obd->u.lmv;
 734         int                      rc;
 735         __u32                    i;
 736         ENTRY;
 737
 738         if (!lmv->tgts)
 739                 goto out_local;
 740
 741         /*
 742          * Only disconnect the underlying layers on the final disconnect.
 743          */
 744         lmv->refcount--;
 745         if (lmv->refcount != 0)
 746                 goto out_local;
 747
 748         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 749                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
 750                         continue;
 751
 752                 lmv_disconnect_mdc(obd, lmv->tgts[i]);
 753         }
 754
 755         if (lmv->targets_proc_entry != NULL)
 756                 lprocfs_remove(&lmv->targets_proc_entry);
 757         else
 758                 CERROR("/proc/fs/lustre/%s/%s/target_obds missing\n",
 759                        obd->obd_type->typ_name, obd->obd_name);
 760
 761 out_local:
 762         /*
 763          * This is the case when no real connection is established by
 764          * lmv_check_connect().
 765          */
 766         if (!lmv->connected)
 767                 class_export_put(exp);
 768         rc = class_disconnect(exp);
 769         if (lmv->refcount == 0)
 770                 lmv->connected = 0;
 771         RETURN(rc);
 772 }
 773
 774 static int lmv_fid2path(struct obd_export *exp, int len, void *karg, void *uarg)
 775 {
 776         struct obd_device       *obddev = class_exp2obd(exp);
 777         struct lmv_obd          *lmv = &obddev->u.lmv;
 778         struct getinfo_fid2path *gf;
 779         struct lmv_tgt_desc     *tgt;
 780         struct getinfo_fid2path *remote_gf = NULL;
 781         int                     remote_gf_size = 0;
 782         int                     rc;
 783
 784         gf = (struct getinfo_fid2path *)karg;
 785         tgt = lmv_find_target(lmv, &gf->gf_fid);
 786         if (IS_ERR(tgt))
 787                 RETURN(PTR_ERR(tgt));
 788
 789 repeat_fid2path:
 790         rc = obd_iocontrol(OBD_IOC_FID2PATH, tgt->ltd_exp, len, gf, uarg);
 791         if (rc != 0 && rc != -EREMOTE)
 792                 GOTO(out_fid2path, rc);
 793
 794         /* If remote_gf != NULL, it means just building the
 795          * path on the remote MDT, copy this path segement to gf */
 796         if (remote_gf != NULL) {
 797                 struct getinfo_fid2path *ori_gf;
 798                 char *ptr;
 799
 800                 ori_gf = (struct getinfo_fid2path *)karg;
 801                 if (strlen(ori_gf->gf_path) +
 802                     strlen(gf->gf_path) > ori_gf->gf_pathlen)
 803                         GOTO(out_fid2path, rc = -EOVERFLOW);
 804
 805                 ptr = ori_gf->gf_path;
 806
 807                 memmove(ptr + strlen(gf->gf_path) + 1, ptr,
 808                         strlen(ori_gf->gf_path));
 809
 810                 strncpy(ptr, gf->gf_path, strlen(gf->gf_path));
 811                 ptr += strlen(gf->gf_path);
 812                 *ptr = '/';
 813         }
 814
 815         CDEBUG(D_INFO, "%s: get path %s "DFID" rec: "LPU64" ln: %u\n",
 816                tgt->ltd_exp->exp_obd->obd_name,
 817                gf->gf_path, PFID(&gf->gf_fid), gf->gf_recno,
 818                gf->gf_linkno);
 819
 820         if (rc == 0)
 821                 GOTO(out_fid2path, rc);
 822
 823         /* sigh, has to go to another MDT to do path building further */
 824         if (remote_gf == NULL) {
 825                 remote_gf_size = sizeof(*remote_gf) + PATH_MAX;
 826                 OBD_ALLOC(remote_gf, remote_gf_size);
 827                 if (remote_gf == NULL)
 828                         GOTO(out_fid2path, rc = -ENOMEM);
 829                 remote_gf->gf_pathlen = PATH_MAX;
 830         }
 831
 832         if (!fid_is_sane(&gf->gf_fid)) {
 833                 CERROR("%s: invalid FID "DFID": rc = %d\n",
 834                        tgt->ltd_exp->exp_obd->obd_name,
 835                        PFID(&gf->gf_fid), -EINVAL);
 836                 GOTO(out_fid2path, rc = -EINVAL);
 837         }
 838
 839         tgt = lmv_find_target(lmv, &gf->gf_fid);
 840         if (IS_ERR(tgt))
 841                 GOTO(out_fid2path, rc = -EINVAL);
 842
 843         remote_gf->gf_fid = gf->gf_fid;
 844         remote_gf->gf_recno = -1;
 845         remote_gf->gf_linkno = -1;
 846         memset(remote_gf->gf_path, 0, remote_gf->gf_pathlen);
 847         gf = remote_gf;
 848         goto repeat_fid2path;
 849
 850 out_fid2path:
 851         if (remote_gf != NULL)
 852                 OBD_FREE(remote_gf, remote_gf_size);
 853         RETURN(rc);
 854 }
 855
 856 static int lmv_hsm_req_count(struct lmv_obd *lmv,
 857                              const struct hsm_user_request *hur,
 858                              const struct lmv_tgt_desc *tgt_mds)
 859 {
 860         __u32                    i;
 861         int                      nr = 0;
 862         struct lmv_tgt_desc     *curr_tgt;
 863
 864         /* count how many requests must be sent to the given target */
 865         for (i = 0; i < hur->hur_request.hr_itemcount; i++) {
 866                 curr_tgt = lmv_find_target(lmv, &hur->hur_user_item[i].hui_fid);
 867                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid))
 868                         nr++;
 869         }
 870         return nr;
 871 }
 872
 873 static void lmv_hsm_req_build(struct lmv_obd *lmv,
 874                               struct hsm_user_request *hur_in,
 875                               const struct lmv_tgt_desc *tgt_mds,
 876                               struct hsm_user_request *hur_out)
 877 {
 878         __u32                    i, nr_out;
 879         struct lmv_tgt_desc     *curr_tgt;
 880
 881         /* build the hsm_user_request for the given target */
 882         hur_out->hur_request = hur_in->hur_request;
 883         nr_out = 0;
 884         for (i = 0; i < hur_in->hur_request.hr_itemcount; i++) {
 885                 curr_tgt = lmv_find_target(lmv,
 886                                            &hur_in->hur_user_item[i].hui_fid);
 887                 if (obd_uuid_equals(&curr_tgt->ltd_uuid, &tgt_mds->ltd_uuid)) {
 888                         hur_out->hur_user_item[nr_out] =
 889                                                 hur_in->hur_user_item[i];
 890                         nr_out++;
 891                 }
 892         }
 893         hur_out->hur_request.hr_itemcount = nr_out;
 894         memcpy(hur_data(hur_out), hur_data(hur_in),
 895                hur_in->hur_request.hr_data_len);
 896 }
 897
 898 static int lmv_hsm_ct_unregister(struct lmv_obd *lmv, unsigned int cmd, int len,
 899                                  struct lustre_kernelcomm *lk, void *uarg)
 900 {
 901         __u32                    i;
 902         int                      rc;
 903         struct kkuc_ct_data     *kcd = NULL;
 904         ENTRY;
 905
 906         /* unregister request (call from llapi_hsm_copytool_fini) */
 907         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 908                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 909
 910                 if (tgt == NULL || tgt->ltd_exp == NULL)
 911                         continue;
 912                 /* best effort: try to clean as much as possible
 913                  * (continue on error) */
 914                 obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
 915         }
 916
 917         /* Whatever the result, remove copytool from kuc groups.
 918          * Unreached coordinators will get EPIPE on next requests
 919          * and will unregister automatically.
 920          */
 921         rc = libcfs_kkuc_group_rem(lk->lk_uid, lk->lk_group, (void **)&kcd);
 922         if (kcd != NULL)
 923                 OBD_FREE_PTR(kcd);
 924
 925         RETURN(rc);
 926 }
 927
 928 static int lmv_hsm_ct_register(struct lmv_obd *lmv, unsigned int cmd, int len,
 929                                struct lustre_kernelcomm *lk, void *uarg)
 930 {
 931         struct file             *filp;
 932         __u32                    i, j;
 933         int                      err, rc;
 934         bool                     any_set = false;
 935         struct kkuc_ct_data     *kcd;
 936         ENTRY;
 937
 938         /* All or nothing: try to register to all MDS.
 939          * In case of failure, unregister from previous MDS,
 940          * except if it because of inactive target. */
 941         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 942                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
 943
 944                 if (tgt == NULL || tgt->ltd_exp == NULL)
 945                         continue;
 946                 err = obd_iocontrol(cmd, tgt->ltd_exp, len, lk, uarg);
 947                 if (err) {
 948                         if (tgt->ltd_active) {
 949                                 /* permanent error */
 950                                 CERROR("%s: iocontrol MDC %s on MDT"
 951                                        " idx %d cmd %x: err = %d\n",
 952                                        class_exp2obd(lmv->exp)->obd_name,
 953                                        tgt->ltd_uuid.uuid, i, cmd, err);
 954                                 rc = err;
 955                                 lk->lk_flags |= LK_FLG_STOP;
 956                                 /* unregister from previous MDS */
 957                                 for (j = 0; j < i; j++) {
 958                                         tgt = lmv->tgts[j];
 959                                         if (tgt == NULL || tgt->ltd_exp == NULL)
 960                                                 continue;
 961                                         obd_iocontrol(cmd, tgt->ltd_exp, len,
 962                                                       lk, uarg);
 963                                 }
 964                                 RETURN(rc);
 965                         }
 966                         /* else: transient error.
 967                          * kuc will register to the missing MDT
 968                          * when it is back */
 969                 } else {
 970                         any_set = true;
 971                 }
 972         }
 973
 974         if (!any_set)
 975                 /* no registration done: return error */
 976                 RETURN(-ENOTCONN);
 977
 978         /* at least one registration done, with no failure */
 979         filp = fget(lk->lk_wfd);
 980         if (filp == NULL)
 981                 RETURN(-EBADF);
 982
 983         OBD_ALLOC_PTR(kcd);
 984         if (kcd == NULL) {
 985                 fput(filp);
 986                 RETURN(-ENOMEM);
 987         }
 988         kcd->kcd_magic = KKUC_CT_DATA_MAGIC;
 989         kcd->kcd_uuid = lmv->cluuid;
 990         kcd->kcd_archive = lk->lk_data;
 991
 992         rc = libcfs_kkuc_group_add(filp, lk->lk_uid, lk->lk_group, kcd);
 993         if (rc != 0) {
 994                 if (filp != NULL)
 995                         fput(filp);
 996                 OBD_FREE_PTR(kcd);
 997         }
 998
 999         RETURN(rc);
1000 }
1001
1002
1003
1004
1005 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
1006                          int len, void *karg, void *uarg)
1007 {
1008         struct obd_device       *obddev = class_exp2obd(exp);
1009         struct lmv_obd          *lmv = &obddev->u.lmv;
1010         struct lmv_tgt_desc     *tgt = NULL;
1011         __u32                    i = 0;
1012         int                      rc = 0;
1013         int                      set = 0;
1014         __u32                    count = lmv->desc.ld_tgt_count;
1015         ENTRY;
1016
1017         if (count == 0)
1018                 RETURN(-ENOTTY);
1019
1020         switch (cmd) {
1021         case IOC_OBD_STATFS: {
1022                 struct obd_ioctl_data *data = karg;
1023                 struct obd_device *mdc_obd;
1024                 struct obd_statfs stat_buf = {0};
1025                 __u32 index;
1026
1027                 memcpy(&index, data->ioc_inlbuf2, sizeof(__u32));
1028                 if ((index >= count))
1029                         RETURN(-ENODEV);
1030
1031                 tgt = lmv->tgts[index];
1032                 if (tgt == NULL || !tgt->ltd_active)
1033                         RETURN(-ENODATA);
1034
1035                 mdc_obd = class_exp2obd(tgt->ltd_exp);
1036                 if (!mdc_obd)
1037                         RETURN(-EINVAL);
1038
1039                 /* copy UUID */
1040                 if (copy_to_user(data->ioc_pbuf2, obd2cli_tgt(mdc_obd),
1041                                  min((int) data->ioc_plen2,
1042                                      (int) sizeof(struct obd_uuid))))
1043                         RETURN(-EFAULT);
1044
1045                 rc = obd_statfs(NULL, tgt->ltd_exp, &stat_buf,
1046                                 cfs_time_shift_64(-OBD_STATFS_CACHE_SECONDS),
1047                                 0);
1048                 if (rc)
1049                         RETURN(rc);
1050                 if (copy_to_user(data->ioc_pbuf1, &stat_buf,
1051                                  min((int) data->ioc_plen1,
1052                                      (int) sizeof(stat_buf))))
1053                         RETURN(-EFAULT);
1054                 break;
1055         }
1056         case OBD_IOC_QUOTACTL: {
1057                 struct if_quotactl *qctl = karg;
1058                 struct obd_quotactl *oqctl;
1059
1060                 if (qctl->qc_valid == QC_MDTIDX) {
1061                         if (count <= qctl->qc_idx)
1062                                 RETURN(-EINVAL);
1063
1064                         tgt = lmv->tgts[qctl->qc_idx];
1065                         if (tgt == NULL || tgt->ltd_exp == NULL)
1066                                 RETURN(-EINVAL);
1067                 } else if (qctl->qc_valid == QC_UUID) {
1068                         for (i = 0; i < count; i++) {
1069                                 tgt = lmv->tgts[i];
1070                                 if (tgt == NULL)
1071                                         continue;
1072                                 if (!obd_uuid_equals(&tgt->ltd_uuid,
1073                                                      &qctl->obd_uuid))
1074                                         continue;
1075
1076                                 if (tgt->ltd_exp == NULL)
1077                                         RETURN(-EINVAL);
1078
1079                                 break;
1080                         }
1081                 } else {
1082                         RETURN(-EINVAL);
1083                 }
1084
1085                 if (i >= count)
1086                         RETURN(-EAGAIN);
1087
1088                 LASSERT(tgt != NULL && tgt->ltd_exp != NULL);
1089                 OBD_ALLOC_PTR(oqctl);
1090                 if (!oqctl)
1091                         RETURN(-ENOMEM);
1092
1093                 QCTL_COPY(oqctl, qctl);
1094                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
1095                 if (rc == 0) {
1096                         QCTL_COPY(qctl, oqctl);
1097                         qctl->qc_valid = QC_MDTIDX;
1098                         qctl->obd_uuid = tgt->ltd_uuid;
1099                 }
1100                 OBD_FREE_PTR(oqctl);
1101                 break;
1102         }
1103         case OBD_IOC_CHANGELOG_SEND:
1104         case OBD_IOC_CHANGELOG_CLEAR: {
1105                 struct ioc_changelog *icc = karg;
1106
1107                 if (icc->icc_mdtindex >= count)
1108                         RETURN(-ENODEV);
1109
1110                 tgt = lmv->tgts[icc->icc_mdtindex];
1111                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
1112                         RETURN(-ENODEV);
1113                 rc = obd_iocontrol(cmd, tgt->ltd_exp, sizeof(*icc), icc, NULL);
1114                 break;
1115         }
1116         case LL_IOC_GET_CONNECT_FLAGS: {
1117                 tgt = lmv->tgts[0];
1118                 if (tgt == NULL || tgt->ltd_exp == NULL)
1119                         RETURN(-ENODATA);
1120                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1121                 break;
1122         }
1123         case OBD_IOC_FID2PATH: {
1124                 rc = lmv_fid2path(exp, len, karg, uarg);
1125                 break;
1126         }
1127         case LL_IOC_HSM_STATE_GET:
1128         case LL_IOC_HSM_STATE_SET:
1129         case LL_IOC_HSM_ACTION: {
1130                 struct md_op_data       *op_data = karg;
1131
1132                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
1133                 if (IS_ERR(tgt))
1134                         RETURN(PTR_ERR(tgt));
1135
1136                 if (tgt->ltd_exp == NULL)
1137                         RETURN(-EINVAL);
1138
1139                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1140                 break;
1141         }
1142         case LL_IOC_HSM_PROGRESS: {
1143                 const struct hsm_progress_kernel *hpk = karg;
1144
1145                 tgt = lmv_find_target(lmv, &hpk->hpk_fid);
1146                 if (IS_ERR(tgt))
1147                         RETURN(PTR_ERR(tgt));
1148                 rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1149                 break;
1150         }
1151         case LL_IOC_HSM_REQUEST: {
1152                 struct hsm_user_request *hur = karg;
1153                 unsigned int reqcount = hur->hur_request.hr_itemcount;
1154
1155                 if (reqcount == 0)
1156                         RETURN(0);
1157
1158                 /* if the request is about a single fid
1159                  * or if there is a single MDS, no need to split
1160                  * the request. */
1161                 if (reqcount == 1 || count == 1) {
1162                         tgt = lmv_find_target(lmv,
1163                                               &hur->hur_user_item[0].hui_fid);
1164                         if (IS_ERR(tgt))
1165                                 RETURN(PTR_ERR(tgt));
1166                         rc = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1167                 } else {
1168                         /* split fid list to their respective MDS */
1169                         for (i = 0; i < count; i++) {
1170                                 unsigned int            nr, reqlen;
1171                                 int                     rc1;
1172                                 struct hsm_user_request *req;
1173
1174                                 tgt = lmv->tgts[i];
1175                                 if (tgt == NULL || tgt->ltd_exp == NULL)
1176                                         continue;
1177
1178                                 nr = lmv_hsm_req_count(lmv, hur, tgt);
1179                                 if (nr == 0) /* nothing for this MDS */
1180                                         continue;
1181
1182                                 /* build a request with fids for this MDS */
1183                                 reqlen = offsetof(typeof(*hur),
1184                                                   hur_user_item[nr])
1185                                                 + hur->hur_request.hr_data_len;
1186                                 OBD_ALLOC_LARGE(req, reqlen);
1187                                 if (req == NULL)
1188                                         RETURN(-ENOMEM);
1189
1190                                 lmv_hsm_req_build(lmv, hur, tgt, req);
1191
1192                                 rc1 = obd_iocontrol(cmd, tgt->ltd_exp, reqlen,
1193                                                     req, uarg);
1194                                 if (rc1 != 0 && rc == 0)
1195                                         rc = rc1;
1196                                 OBD_FREE_LARGE(req, reqlen);
1197                         }
1198                 }
1199                 break;
1200         }
1201         case LL_IOC_LOV_SWAP_LAYOUTS: {
1202                 struct md_op_data       *op_data = karg;
1203                 struct lmv_tgt_desc     *tgt1, *tgt2;
1204
1205                 tgt1 = lmv_find_target(lmv, &op_data->op_fid1);
1206                 if (IS_ERR(tgt1))
1207                         RETURN(PTR_ERR(tgt1));
1208
1209                 tgt2 = lmv_find_target(lmv, &op_data->op_fid2);
1210                 if (IS_ERR(tgt2))
1211                         RETURN(PTR_ERR(tgt2));
1212
1213                 if ((tgt1->ltd_exp == NULL) || (tgt2->ltd_exp == NULL))
1214                         RETURN(-EINVAL);
1215
1216                 /* only files on same MDT can have their layouts swapped */
1217                 if (tgt1->ltd_idx != tgt2->ltd_idx)
1218                         RETURN(-EPERM);
1219
1220                 rc = obd_iocontrol(cmd, tgt1->ltd_exp, len, karg, uarg);
1221                 break;
1222         }
1223         case LL_IOC_HSM_CT_START: {
1224                 struct lustre_kernelcomm *lk = karg;
1225                 if (lk->lk_flags & LK_FLG_STOP)
1226                         rc = lmv_hsm_ct_unregister(lmv, cmd, len, lk, uarg);
1227                 else
1228                         rc = lmv_hsm_ct_register(lmv, cmd, len, lk, uarg);
1229                 break;
1230         }
1231         default:
1232                 for (i = 0; i < count; i++) {
1233                         struct obd_device *mdc_obd;
1234                         int err;
1235
1236                         tgt = lmv->tgts[i];
1237                         if (tgt == NULL || tgt->ltd_exp == NULL)
1238                                 continue;
1239                         /* ll_umount_begin() sets force flag but for lmv, not
1240                          * mdc. Let's pass it through */
1241                         mdc_obd = class_exp2obd(tgt->ltd_exp);
1242                         mdc_obd->obd_force = obddev->obd_force;
1243                         err = obd_iocontrol(cmd, tgt->ltd_exp, len, karg, uarg);
1244                         if (err == -ENODATA && cmd == OBD_IOC_POLL_QUOTACHECK) {
1245                                 RETURN(err);
1246                         } else if (err) {
1247                                 if (tgt->ltd_active) {
1248                                         CERROR("error: iocontrol MDC %s on MDT"
1249                                                " idx %d cmd %x: err = %d\n",
1250                                                tgt->ltd_uuid.uuid, i, cmd, err);
1251                                         if (!rc)
1252                                                 rc = err;
1253                                 }
1254                         } else
1255                                 set = 1;
1256                 }
1257                 if (!set && !rc)
1258                         rc = -EIO;
1259         }
1260         RETURN(rc);
1261 }
1262
1263 #if 0
1264 static int lmv_all_chars_policy(int count, const char *name,
1265                                 int len)
1266 {
1267         unsigned int c = 0;
1268
1269         while (len > 0)
1270                 c += name[--len];
1271         c = c % count;
1272         return c;
1273 }
1274
1275 static int lmv_nid_policy(struct lmv_obd *lmv)
1276 {
1277         struct obd_import *imp;
1278         __u32              id;
1279
1280         /*
1281          * XXX: To get nid we assume that underlying obd device is mdc.
1282          */
1283         imp = class_exp2cliimp(lmv->tgts[0].ltd_exp);
1284         id = imp->imp_connection->c_self ^ (imp->imp_connection->c_self >> 32);
1285         return id % lmv->desc.ld_tgt_count;
1286 }
1287
1288 static int lmv_choose_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
1289                           placement_policy_t placement)
1290 {
1291         switch (placement) {
1292         case PLACEMENT_CHAR_POLICY:
1293                 return lmv_all_chars_policy(lmv->desc.ld_tgt_count,
1294                                             op_data->op_name,
1295                                             op_data->op_namelen);
1296         case PLACEMENT_NID_POLICY:
1297                 return lmv_nid_policy(lmv);
1298
1299         default:
1300                 break;
1301         }
1302
1303         CERROR("Unsupported placement policy %x\n", placement);
1304         return -EINVAL;
1305 }
1306 #endif
1307
1308 /**
1309  * This is _inode_ placement policy function (not name).
1310  */
1311 static int lmv_placement_policy(struct obd_device *obd,
1312                                 struct md_op_data *op_data,
1313                                 mdsno_t *mds)
1314 {
1315         struct lmv_obd          *lmv = &obd->u.lmv;
1316         ENTRY;
1317
1318         LASSERT(mds != NULL);
1319
1320         if (lmv->desc.ld_tgt_count == 1) {
1321                 *mds = 0;
1322                 RETURN(0);
1323         }
1324
1325         /**
1326          * If stripe_offset is provided during setdirstripe
1327          * (setdirstripe -i xx), xx MDS will be choosen.
1328          */
1329         if (op_data->op_cli_flags & CLI_SET_MEA && op_data->op_data != NULL) {
1330                 struct lmv_user_md *lum;
1331
1332                 lum = op_data->op_data;
1333
1334                 if (le32_to_cpu(lum->lum_stripe_offset) != (__u32)-1) {
1335                         *mds = le32_to_cpu(lum->lum_stripe_offset);
1336                 } else {
1337                         /* -1 means default, which will be in the same MDT with
1338                          * the stripe */
1339                         *mds = op_data->op_mds;
1340                         lum->lum_stripe_offset = cpu_to_le32(op_data->op_mds);
1341                 }
1342         } else {
1343                 /* Allocate new fid on target according to operation type and
1344                  * parent home mds. */
1345                 *mds = op_data->op_mds;
1346         }
1347
1348         RETURN(0);
1349 }
1350
1351 int __lmv_fid_alloc(struct lmv_obd *lmv, struct lu_fid *fid,
1352                     mdsno_t mds)
1353 {
1354         struct lmv_tgt_desc     *tgt;
1355         int                      rc;
1356         ENTRY;
1357
1358         tgt = lmv_get_target(lmv, mds, NULL);
1359         if (IS_ERR(tgt))
1360                 RETURN(PTR_ERR(tgt));
1361
1362         /*
1363          * New seq alloc and FLD setup should be atomic. Otherwise we may find
1364          * on server that seq in new allocated fid is not yet known.
1365          */
1366         mutex_lock(&tgt->ltd_fid_mutex);
1367
1368         if (tgt->ltd_active == 0 || tgt->ltd_exp == NULL)
1369                 GOTO(out, rc = -ENODEV);
1370
1371         /*
1372          * Asking underlying tgt layer to allocate new fid.
1373          */
1374         rc = obd_fid_alloc(NULL, tgt->ltd_exp, fid, NULL);
1375         if (rc > 0) {
1376                 LASSERT(fid_is_sane(fid));
1377                 rc = 0;
1378         }
1379
1380         EXIT;
1381 out:
1382         mutex_unlock(&tgt->ltd_fid_mutex);
1383         return rc;
1384 }
1385
1386 int lmv_fid_alloc(const struct lu_env *env, struct obd_export *exp,
1387                   struct lu_fid *fid, struct md_op_data *op_data)
1388 {
1389         struct obd_device     *obd = class_exp2obd(exp);
1390         struct lmv_obd        *lmv = &obd->u.lmv;
1391         mdsno_t                mds = 0;
1392         int                    rc;
1393         ENTRY;
1394
1395         LASSERT(op_data != NULL);
1396         LASSERT(fid != NULL);
1397
1398         rc = lmv_placement_policy(obd, op_data, &mds);
1399         if (rc) {
1400                 CERROR("Can't get target for allocating fid, "
1401                        "rc %d\n", rc);
1402                 RETURN(rc);
1403         }
1404
1405         rc = __lmv_fid_alloc(lmv, fid, mds);
1406         if (rc) {
1407                 CERROR("Can't alloc new fid, rc %d\n", rc);
1408                 RETURN(rc);
1409         }
1410
1411         RETURN(rc);
1412 }
1413
1414 static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
1415 {
1416         struct lmv_obd  *lmv = &obd->u.lmv;
1417         struct lmv_desc *desc;
1418         int             rc;
1419         ENTRY;
1420
1421         if (LUSTRE_CFG_BUFLEN(lcfg, 1) < 1) {
1422                 CERROR("LMV setup requires a descriptor\n");
1423                 RETURN(-EINVAL);
1424         }
1425
1426         desc = (struct lmv_desc *)lustre_cfg_buf(lcfg, 1);
1427         if (sizeof(*desc) > LUSTRE_CFG_BUFLEN(lcfg, 1)) {
1428                 CERROR("Lmv descriptor size wrong: %d > %d\n",
1429                        (int)sizeof(*desc), LUSTRE_CFG_BUFLEN(lcfg, 1));
1430                 RETURN(-EINVAL);
1431         }
1432
1433         OBD_ALLOC(lmv->tgts, sizeof(*lmv->tgts) * 32);
1434         if (lmv->tgts == NULL)
1435                 RETURN(-ENOMEM);
1436         lmv->tgts_size = 32;
1437
1438         obd_str2uuid(&lmv->desc.ld_uuid, desc->ld_uuid.uuid);
1439         lmv->desc.ld_tgt_count = 0;
1440         lmv->desc.ld_active_tgt_count = 0;
1441         lmv->max_cookiesize = 0;
1442         lmv->max_def_easize = 0;
1443         lmv->max_easize = 0;
1444         lmv->lmv_placement = PLACEMENT_CHAR_POLICY;
1445
1446         spin_lock_init(&lmv->lmv_lock);
1447         mutex_init(&lmv->init_mutex);
1448
1449 #ifdef LPROCFS
1450         obd->obd_vars = lprocfs_lmv_obd_vars;
1451         lprocfs_seq_obd_setup(obd);
1452         lprocfs_alloc_md_stats(obd, 0);
1453         rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",
1454                                 0444, &lmv_proc_target_fops, obd);
1455         if (rc)
1456                 CWARN("%s: error adding LMV target_obd file: rc = %d\n",
1457                       obd->obd_name, rc);
1458 #endif
1459         rc = fld_client_init(&lmv->lmv_fld, obd->obd_name,
1460                              LUSTRE_CLI_FLD_HASH_DHT);
1461         if (rc) {
1462                 CERROR("Can't init FLD, err %d\n", rc);
1463                 GOTO(out, rc);
1464         }
1465
1466         RETURN(0);
1467
1468 out:
1469         return rc;
1470 }
1471
1472 static int lmv_cleanup(struct obd_device *obd)
1473 {
1474         struct lmv_obd   *lmv = &obd->u.lmv;
1475         ENTRY;
1476
1477         fld_client_fini(&lmv->lmv_fld);
1478         if (lmv->tgts != NULL) {
1479                 int i;
1480                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1481                         if (lmv->tgts[i] == NULL)
1482                                 continue;
1483                         lmv_del_target(lmv, i);
1484                 }
1485                 OBD_FREE(lmv->tgts, sizeof(*lmv->tgts) * lmv->tgts_size);
1486                 lmv->tgts_size = 0;
1487         }
1488         RETURN(0);
1489 }
1490
1491 static int lmv_process_config(struct obd_device *obd, obd_count len, void *buf)
1492 {
1493         struct lustre_cfg       *lcfg = buf;
1494         struct obd_uuid         obd_uuid;
1495         int                     gen;
1496         __u32                   index;
1497         int                     rc;
1498         ENTRY;
1499
1500         switch (lcfg->lcfg_command) {
1501         case LCFG_ADD_MDC:
1502                 /* modify_mdc_tgts add 0:lustre-clilmv  1:lustre-MDT0000_UUID
1503                  * 2:0  3:1  4:lustre-MDT0000-mdc_UUID */
1504                 if (LUSTRE_CFG_BUFLEN(lcfg, 1) > sizeof(obd_uuid.uuid))
1505                         GOTO(out, rc = -EINVAL);
1506
1507                 obd_str2uuid(&obd_uuid,  lustre_cfg_buf(lcfg, 1));
1508
1509                 if (sscanf(lustre_cfg_buf(lcfg, 2), "%u", &index) != 1)
1510                         GOTO(out, rc = -EINVAL);
1511                 if (sscanf(lustre_cfg_buf(lcfg, 3), "%d", &gen) != 1)
1512                         GOTO(out, rc = -EINVAL);
1513                 rc = lmv_add_target(obd, &obd_uuid, index, gen);
1514                 GOTO(out, rc);
1515         default:
1516                 CERROR("Unknown command: %d\n", lcfg->lcfg_command);
1517                 GOTO(out, rc = -EINVAL);
1518         }
1519 out:
1520         RETURN(rc);
1521 }
1522
1523 static int lmv_statfs(const struct lu_env *env, struct obd_export *exp,
1524                       struct obd_statfs *osfs, __u64 max_age, __u32 flags)
1525 {
1526         struct obd_device       *obd = class_exp2obd(exp);
1527         struct lmv_obd          *lmv = &obd->u.lmv;
1528         struct obd_statfs       *temp;
1529         int                      rc = 0;
1530         __u32                    i;
1531         ENTRY;
1532
1533         rc = lmv_check_connect(obd);
1534         if (rc)
1535                 RETURN(rc);
1536
1537         OBD_ALLOC(temp, sizeof(*temp));
1538         if (temp == NULL)
1539                 RETURN(-ENOMEM);
1540
1541         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1542                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1543                         continue;
1544
1545                 rc = obd_statfs(env, lmv->tgts[i]->ltd_exp, temp,
1546                                 max_age, flags);
1547                 if (rc) {
1548                         CERROR("can't stat MDS #%d (%s), error %d\n", i,
1549                                lmv->tgts[i]->ltd_exp->exp_obd->obd_name,
1550                                rc);
1551                         GOTO(out_free_temp, rc);
1552                 }
1553
1554                 if (i == 0) {
1555                         *osfs = *temp;
1556                         /* If the statfs is from mount, it will needs
1557                          * retrieve necessary information from MDT0.
1558                          * i.e. mount does not need the merged osfs
1559                          * from all of MDT.
1560                          * And also clients can be mounted as long as
1561                          * MDT0 is in service*/
1562                         if (flags & OBD_STATFS_FOR_MDT0)
1563                                 GOTO(out_free_temp, rc);
1564                 } else {
1565                         osfs->os_bavail += temp->os_bavail;
1566                         osfs->os_blocks += temp->os_blocks;
1567                         osfs->os_ffree += temp->os_ffree;
1568                         osfs->os_files += temp->os_files;
1569                 }
1570         }
1571
1572         EXIT;
1573 out_free_temp:
1574         OBD_FREE(temp, sizeof(*temp));
1575         return rc;
1576 }
1577
1578 static int lmv_getstatus(struct obd_export *exp,
1579                          struct lu_fid *fid,
1580                          struct obd_capa **pc)
1581 {
1582         struct obd_device    *obd = exp->exp_obd;
1583         struct lmv_obd       *lmv = &obd->u.lmv;
1584         int                   rc;
1585         ENTRY;
1586
1587         rc = lmv_check_connect(obd);
1588         if (rc)
1589                 RETURN(rc);
1590
1591         rc = md_getstatus(lmv->tgts[0]->ltd_exp, fid, pc);
1592         RETURN(rc);
1593 }
1594
1595 static int lmv_getxattr(struct obd_export *exp, const struct lu_fid *fid,
1596                         struct obd_capa *oc, obd_valid valid, const char *name,
1597                         const char *input, int input_size, int output_size,
1598                         int flags, struct ptlrpc_request **request)
1599 {
1600         struct obd_device      *obd = exp->exp_obd;
1601         struct lmv_obd         *lmv = &obd->u.lmv;
1602         struct lmv_tgt_desc    *tgt;
1603         int                     rc;
1604         ENTRY;
1605
1606         rc = lmv_check_connect(obd);
1607         if (rc)
1608                 RETURN(rc);
1609
1610         tgt = lmv_find_target(lmv, fid);
1611         if (IS_ERR(tgt))
1612                 RETURN(PTR_ERR(tgt));
1613
1614         rc = md_getxattr(tgt->ltd_exp, fid, oc, valid, name, input,
1615                          input_size, output_size, flags, request);
1616
1617         RETURN(rc);
1618 }
1619
1620 static int lmv_setxattr(struct obd_export *exp, const struct lu_fid *fid,
1621                         struct obd_capa *oc, obd_valid valid, const char *name,
1622                         const char *input, int input_size, int output_size,
1623                         int flags, __u32 suppgid,
1624                         struct ptlrpc_request **request)
1625 {
1626         struct obd_device      *obd = exp->exp_obd;
1627         struct lmv_obd         *lmv = &obd->u.lmv;
1628         struct lmv_tgt_desc    *tgt;
1629         int                     rc;
1630         ENTRY;
1631
1632         rc = lmv_check_connect(obd);
1633         if (rc)
1634                 RETURN(rc);
1635
1636         tgt = lmv_find_target(lmv, fid);
1637         if (IS_ERR(tgt))
1638                 RETURN(PTR_ERR(tgt));
1639
1640         rc = md_setxattr(tgt->ltd_exp, fid, oc, valid, name, input,
1641                          input_size, output_size, flags, suppgid,
1642                          request);
1643
1644         RETURN(rc);
1645 }
1646
1647 static int lmv_getattr(struct obd_export *exp, struct md_op_data *op_data,
1648                        struct ptlrpc_request **request)
1649 {
1650         struct obd_device       *obd = exp->exp_obd;
1651         struct lmv_obd          *lmv = &obd->u.lmv;
1652         struct lmv_tgt_desc     *tgt;
1653         int                      rc;
1654         ENTRY;
1655
1656         rc = lmv_check_connect(obd);
1657         if (rc)
1658                 RETURN(rc);
1659
1660         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1661         if (IS_ERR(tgt))
1662                 RETURN(PTR_ERR(tgt));
1663
1664         if (op_data->op_flags & MF_GET_MDT_IDX) {
1665                 op_data->op_mds = tgt->ltd_idx;
1666                 RETURN(0);
1667         }
1668
1669         rc = md_getattr(tgt->ltd_exp, op_data, request);
1670
1671         RETURN(rc);
1672 }
1673
1674 static int lmv_null_inode(struct obd_export *exp, const struct lu_fid *fid)
1675 {
1676         struct obd_device   *obd = exp->exp_obd;
1677         struct lmv_obd      *lmv = &obd->u.lmv;
1678         __u32                i;
1679         int                  rc;
1680         ENTRY;
1681
1682         rc = lmv_check_connect(obd);
1683         if (rc)
1684                 RETURN(rc);
1685
1686         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1687
1688         /*
1689          * With DNE every object can have two locks in different namespaces:
1690          * lookup lock in space of MDT storing direntry and update/open lock in
1691          * space of MDT storing inode.
1692          */
1693         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1694                 if (lmv->tgts[i] == NULL || lmv->tgts[i]->ltd_exp == NULL)
1695                         continue;
1696                 md_null_inode(lmv->tgts[i]->ltd_exp, fid);
1697         }
1698
1699         RETURN(0);
1700 }
1701
1702 static int lmv_find_cbdata(struct obd_export *exp, const struct lu_fid *fid,
1703                            ldlm_iterator_t it, void *data)
1704 {
1705         struct obd_device       *obd = exp->exp_obd;
1706         struct lmv_obd          *lmv = &obd->u.lmv;
1707         int                     i;
1708         int                     tgt;
1709         int                     rc;
1710         ENTRY;
1711
1712         rc = lmv_check_connect(obd);
1713         if (rc)
1714                 RETURN(rc);
1715
1716         CDEBUG(D_INODE, "CBDATA for "DFID"\n", PFID(fid));
1717
1718         /*
1719          * With DNE every object can have two locks in different namespaces:
1720          * lookup lock in space of MDT storing direntry and update/open lock in
1721          * space of MDT storing inode.  Try the MDT that the FID maps to first,
1722          * since this can be easily found, and only try others if that fails.
1723          */
1724         for (i = 0, tgt = lmv_find_target_index(lmv, fid);
1725              i < lmv->desc.ld_tgt_count;
1726              i++, tgt = (tgt + 1) % lmv->desc.ld_tgt_count) {
1727                 if (tgt < 0) {
1728                         CDEBUG(D_HA, "%s: "DFID" is inaccessible: rc = %d\n",
1729                                obd->obd_name, PFID(fid), tgt);
1730                         tgt = 0;
1731                 }
1732
1733                 if (lmv->tgts[tgt] == NULL ||
1734                     lmv->tgts[tgt]->ltd_exp == NULL)
1735                         continue;
1736
1737                 rc = md_find_cbdata(lmv->tgts[tgt]->ltd_exp, fid, it, data);
1738                 if (rc)
1739                         RETURN(rc);
1740         }
1741
1742         RETURN(rc);
1743 }
1744
1745
1746 static int lmv_close(struct obd_export *exp, struct md_op_data *op_data,
1747                      struct md_open_data *mod, struct ptlrpc_request **request)
1748 {
1749         struct obd_device     *obd = exp->exp_obd;
1750         struct lmv_obd        *lmv = &obd->u.lmv;
1751         struct lmv_tgt_desc   *tgt;
1752         int                    rc;
1753         ENTRY;
1754
1755         rc = lmv_check_connect(obd);
1756         if (rc)
1757                 RETURN(rc);
1758
1759         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1760         if (IS_ERR(tgt))
1761                 RETURN(PTR_ERR(tgt));
1762
1763         CDEBUG(D_INODE, "CLOSE "DFID"\n", PFID(&op_data->op_fid1));
1764         rc = md_close(tgt->ltd_exp, op_data, mod, request);
1765         RETURN(rc);
1766 }
1767
1768 /**
1769  * Choosing the MDT by name or FID in @op_data.
1770  * For non-striped directory, it will locate MDT by fid.
1771  * For striped-directory, it will locate MDT by name. And also
1772  * it will reset op_fid1 with the FID of the choosen stripe.
1773  **/
1774 struct lmv_tgt_desc *
1775 lmv_locate_target_for_name(struct lmv_obd *lmv, struct lmv_stripe_md *lsm,
1776                            const char *name, int namelen, struct lu_fid *fid,
1777                            mdsno_t *mds)
1778 {
1779         struct lmv_tgt_desc     *tgt;
1780         const struct lmv_oinfo  *oinfo;
1781
1782         oinfo = lsm_name_to_stripe_info(lsm, name, namelen);
1783         if (IS_ERR(oinfo))
1784                 RETURN(ERR_CAST(oinfo));
1785         *fid = oinfo->lmo_fid;
1786         *mds = oinfo->lmo_mds;
1787         tgt = lmv_get_target(lmv, *mds, NULL);
1788
1789         CDEBUG(D_INFO, "locate on mds %u "DFID"\n", *mds, PFID(fid));
1790         return tgt;
1791 }
1792
1793 /**
1794  * Locate mds by fid or name
1795  *
1796  * For striped directory (lsm != NULL), it will locate the stripe
1797  * by name hash (see lsm_name_to_stripe_info()). Note: if the hash_type
1798  * is unknown, it will return -EBADFD, and lmv_intent_lookup might need
1799  * walk through all of stripes to locate the entry.
1800  *
1801  * For normal direcotry, it will locate MDS by FID directly.
1802  * \param[in] lmv       LMV device
1803  * \param[in] op_data   client MD stack parameters, name, namelen
1804  *                      mds_num etc.
1805  * \param[in] fid       object FID used to locate MDS.
1806  *
1807  * retval               pointer to the lmv_tgt_desc if succeed.
1808  *                      ERR_PTR(errno) if failed.
1809  */
1810 struct lmv_tgt_desc
1811 *lmv_locate_mds(struct lmv_obd *lmv, struct md_op_data *op_data,
1812                 struct lu_fid *fid)
1813 {
1814         struct lmv_stripe_md    *lsm = op_data->op_mea1;
1815         struct lmv_tgt_desc     *tgt;
1816
1817         if (lsm == NULL || op_data->op_namelen == 0) {
1818                 tgt = lmv_find_target(lmv, fid);
1819                 if (IS_ERR(tgt))
1820                         return tgt;
1821
1822                 op_data->op_mds = tgt->ltd_idx;
1823                 return tgt;
1824         }
1825
1826         return lmv_locate_target_for_name(lmv, lsm, op_data->op_name,
1827                                           op_data->op_namelen, fid,
1828                                           &op_data->op_mds);
1829 }
1830
1831 int lmv_create(struct obd_export *exp, struct md_op_data *op_data,
1832                const void *data, int datalen, int mode, __u32 uid,
1833                __u32 gid, cfs_cap_t cap_effective, __u64 rdev,
1834                struct ptlrpc_request **request)
1835 {
1836         struct obd_device       *obd = exp->exp_obd;
1837         struct lmv_obd          *lmv = &obd->u.lmv;
1838         struct lmv_tgt_desc     *tgt;
1839         int                      rc;
1840         ENTRY;
1841
1842         rc = lmv_check_connect(obd);
1843         if (rc)
1844                 RETURN(rc);
1845
1846         if (!lmv->desc.ld_active_tgt_count)
1847                 RETURN(-EIO);
1848
1849         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1850         if (IS_ERR(tgt))
1851                 RETURN(PTR_ERR(tgt));
1852
1853         CDEBUG(D_INODE, "CREATE name '%.*s' on "DFID" -> mds #%x\n",
1854                op_data->op_namelen, op_data->op_name, PFID(&op_data->op_fid1),
1855                op_data->op_mds);
1856
1857         rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
1858         if (rc)
1859                 RETURN(rc);
1860
1861         /* Send the create request to the MDT where the object
1862          * will be located */
1863         tgt = lmv_find_target(lmv, &op_data->op_fid2);
1864         if (IS_ERR(tgt))
1865                 RETURN(PTR_ERR(tgt));
1866
1867         op_data->op_mds = tgt->ltd_idx;
1868
1869         CDEBUG(D_INODE, "CREATE obj "DFID" -> mds #%x\n",
1870                PFID(&op_data->op_fid2), op_data->op_mds);
1871
1872         op_data->op_flags |= MF_MDC_CANCEL_FID1;
1873         rc = md_create(tgt->ltd_exp, op_data, data, datalen, mode, uid, gid,
1874                        cap_effective, rdev, request);
1875         if (rc == 0) {
1876                 if (*request == NULL)
1877                         RETURN(rc);
1878                 CDEBUG(D_INODE, "Created - "DFID"\n", PFID(&op_data->op_fid2));
1879         }
1880         RETURN(rc);
1881 }
1882
1883 static int lmv_done_writing(struct obd_export *exp,
1884                             struct md_op_data *op_data,
1885                             struct md_open_data *mod)
1886 {
1887         struct obd_device     *obd = exp->exp_obd;
1888         struct lmv_obd        *lmv = &obd->u.lmv;
1889         struct lmv_tgt_desc   *tgt;
1890         int                    rc;
1891         ENTRY;
1892
1893         rc = lmv_check_connect(obd);
1894         if (rc)
1895                 RETURN(rc);
1896
1897         tgt = lmv_find_target(lmv, &op_data->op_fid1);
1898         if (IS_ERR(tgt))
1899                 RETURN(PTR_ERR(tgt));
1900
1901         rc = md_done_writing(tgt->ltd_exp, op_data, mod);
1902         RETURN(rc);
1903 }
1904
1905 static int
1906 lmv_enqueue(struct obd_export *exp, struct ldlm_enqueue_info *einfo,
1907             const union ldlm_policy_data *policy,
1908             struct lookup_intent *it, struct md_op_data *op_data,
1909             struct lustre_handle *lockh, __u64 extra_lock_flags)
1910 {
1911         struct obd_device        *obd = exp->exp_obd;
1912         struct lmv_obd           *lmv = &obd->u.lmv;
1913         struct lmv_tgt_desc      *tgt;
1914         int                       rc;
1915         ENTRY;
1916
1917         rc = lmv_check_connect(obd);
1918         if (rc)
1919                 RETURN(rc);
1920
1921         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID"\n",
1922                LL_IT2STR(it), PFID(&op_data->op_fid1));
1923
1924         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1925         if (IS_ERR(tgt))
1926                 RETURN(PTR_ERR(tgt));
1927
1928         CDEBUG(D_INODE, "ENQUEUE '%s' on "DFID" -> mds #%d\n",
1929                LL_IT2STR(it), PFID(&op_data->op_fid1), tgt->ltd_idx);
1930
1931         rc = md_enqueue(tgt->ltd_exp, einfo, policy, it, op_data, lockh,
1932                         extra_lock_flags);
1933
1934         RETURN(rc);
1935 }
1936
1937 static int
1938 lmv_getattr_name(struct obd_export *exp,struct md_op_data *op_data,
1939                  struct ptlrpc_request **preq)
1940 {
1941         struct ptlrpc_request   *req = NULL;
1942         struct obd_device       *obd = exp->exp_obd;
1943         struct lmv_obd          *lmv = &obd->u.lmv;
1944         struct lmv_tgt_desc     *tgt;
1945         struct mdt_body         *body;
1946         int                      rc;
1947         ENTRY;
1948
1949         rc = lmv_check_connect(obd);
1950         if (rc)
1951                 RETURN(rc);
1952
1953         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
1954         if (IS_ERR(tgt))
1955                 RETURN(PTR_ERR(tgt));
1956
1957         CDEBUG(D_INODE, "GETATTR_NAME for %*s on "DFID" -> mds #%d\n",
1958                op_data->op_namelen, op_data->op_name, PFID(&op_data->op_fid1),
1959                tgt->ltd_idx);
1960
1961         rc = md_getattr_name(tgt->ltd_exp, op_data, preq);
1962         if (rc != 0)
1963                 RETURN(rc);
1964
1965         body = req_capsule_server_get(&(*preq)->rq_pill, &RMF_MDT_BODY);
1966         LASSERT(body != NULL);
1967
1968         if (body->mbo_valid & OBD_MD_MDS) {
1969                 struct lu_fid rid = body->mbo_fid1;
1970                 CDEBUG(D_INODE, "Request attrs for "DFID"\n",
1971                        PFID(&rid));
1972
1973                 tgt = lmv_find_target(lmv, &rid);
1974                 if (IS_ERR(tgt)) {
1975                         ptlrpc_req_finished(*preq);
1976                         preq = NULL;
1977                         RETURN(PTR_ERR(tgt));
1978                 }
1979
1980                 op_data->op_fid1 = rid;
1981                 op_data->op_valid |= OBD_MD_FLCROSSREF;
1982                 op_data->op_namelen = 0;
1983                 op_data->op_name = NULL;
1984                 rc = md_getattr_name(tgt->ltd_exp, op_data, &req);
1985                 ptlrpc_req_finished(*preq);
1986                 *preq = req;
1987         }
1988
1989         RETURN(rc);
1990 }
1991
1992 #define md_op_data_fid(op_data, fl)                     \
1993         (fl == MF_MDC_CANCEL_FID1 ? &op_data->op_fid1 : \
1994          fl == MF_MDC_CANCEL_FID2 ? &op_data->op_fid2 : \
1995          fl == MF_MDC_CANCEL_FID3 ? &op_data->op_fid3 : \
1996          fl == MF_MDC_CANCEL_FID4 ? &op_data->op_fid4 : \
1997          NULL)
1998
1999 static int lmv_early_cancel(struct obd_export *exp, struct lmv_tgt_desc *tgt,
2000                             struct md_op_data *op_data,
2001                             int op_tgt, ldlm_mode_t mode, int bits, int flag)
2002 {
2003         struct lu_fid          *fid = md_op_data_fid(op_data, flag);
2004         struct obd_device      *obd = exp->exp_obd;
2005         struct lmv_obd         *lmv = &obd->u.lmv;
2006         ldlm_policy_data_t      policy = {{ 0 }};
2007         int                     rc = 0;
2008         ENTRY;
2009
2010         if (!fid_is_sane(fid))
2011                 RETURN(0);
2012
2013         if (tgt == NULL) {
2014                 tgt = lmv_find_target(lmv, fid);
2015                 if (IS_ERR(tgt))
2016                         RETURN(PTR_ERR(tgt));
2017         }
2018
2019         if (tgt->ltd_idx != op_tgt) {
2020                 CDEBUG(D_INODE, "EARLY_CANCEL on "DFID"\n", PFID(fid));
2021                 policy.l_inodebits.bits = bits;
2022                 rc = md_cancel_unused(tgt->ltd_exp, fid, &policy,
2023                                       mode, LCF_ASYNC, NULL);
2024         } else {
2025                 CDEBUG(D_INODE,
2026                        "EARLY_CANCEL skip operation target %d on "DFID"\n",
2027                        op_tgt, PFID(fid));
2028                 op_data->op_flags |= flag;
2029                 rc = 0;
2030         }
2031
2032         RETURN(rc);
2033 }
2034
2035 /*
2036  * llite passes fid of an target inode in op_data->op_fid1 and id of directory in
2037  * op_data->op_fid2
2038  */
2039 static int lmv_link(struct obd_export *exp, struct md_op_data *op_data,
2040                     struct ptlrpc_request **request)
2041 {
2042         struct obd_device       *obd = exp->exp_obd;
2043         struct lmv_obd          *lmv = &obd->u.lmv;
2044         struct lmv_tgt_desc     *tgt;
2045         int                      rc;
2046         ENTRY;
2047
2048         rc = lmv_check_connect(obd);
2049         if (rc)
2050                 RETURN(rc);
2051
2052         LASSERT(op_data->op_namelen != 0);
2053
2054         CDEBUG(D_INODE, "LINK "DFID":%*s to "DFID"\n",
2055                PFID(&op_data->op_fid2), op_data->op_namelen,
2056                op_data->op_name, PFID(&op_data->op_fid1));
2057
2058         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2059         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2060         op_data->op_cap = cfs_curproc_cap_pack();
2061         if (op_data->op_mea2 != NULL) {
2062                 struct lmv_stripe_md    *lsm = op_data->op_mea2;
2063                 const struct lmv_oinfo  *oinfo;
2064
2065                 oinfo = lsm_name_to_stripe_info(lsm, op_data->op_name,
2066                                                 op_data->op_namelen);
2067                 if (IS_ERR(oinfo))
2068                         RETURN(PTR_ERR(oinfo));
2069
2070                 op_data->op_fid2 = oinfo->lmo_fid;
2071         }
2072
2073         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid2);
2074         if (IS_ERR(tgt))
2075                 RETURN(PTR_ERR(tgt));
2076
2077         /*
2078          * Cancel UPDATE lock on child (fid1).
2079          */
2080         op_data->op_flags |= MF_MDC_CANCEL_FID2;
2081         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_idx, LCK_EX,
2082                               MDS_INODELOCK_UPDATE, MF_MDC_CANCEL_FID1);
2083         if (rc != 0)
2084                 RETURN(rc);
2085
2086         rc = md_link(tgt->ltd_exp, op_data, request);
2087
2088         RETURN(rc);
2089 }
2090
2091 static int lmv_rename(struct obd_export *exp, struct md_op_data *op_data,
2092                       const char *old, int oldlen, const char *new, int newlen,
2093                       struct ptlrpc_request **request)
2094 {
2095         struct obd_device       *obd = exp->exp_obd;
2096         struct lmv_obd          *lmv = &obd->u.lmv;
2097         struct lmv_tgt_desc     *src_tgt;
2098         int                     rc;
2099         ENTRY;
2100
2101         LASSERT(oldlen != 0);
2102
2103         CDEBUG(D_INODE, "RENAME %.*s in "DFID":%d to %.*s in "DFID":%d\n",
2104                oldlen, old, PFID(&op_data->op_fid1),
2105                op_data->op_mea1 ? op_data->op_mea1->lsm_md_stripe_count : 0,
2106                newlen, new, PFID(&op_data->op_fid2),
2107                op_data->op_mea2 ? op_data->op_mea2->lsm_md_stripe_count : 0);
2108
2109         rc = lmv_check_connect(obd);
2110         if (rc)
2111                 RETURN(rc);
2112
2113         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2114         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2115         op_data->op_cap = cfs_curproc_cap_pack();
2116         if (op_data->op_cli_flags & CLI_MIGRATE) {
2117                 LASSERTF(fid_is_sane(&op_data->op_fid3), "invalid FID "DFID"\n",
2118                          PFID(&op_data->op_fid3));
2119                 rc = lmv_fid_alloc(NULL, exp, &op_data->op_fid2, op_data);
2120                 if (rc)
2121                         RETURN(rc);
2122                 src_tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid3);
2123         } else {
2124                 if (op_data->op_mea1 != NULL) {
2125                         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2126
2127                         src_tgt = lmv_locate_target_for_name(lmv, lsm, old,
2128                                                              oldlen,
2129                                                              &op_data->op_fid1,
2130                                                              &op_data->op_mds);
2131                         if (IS_ERR(src_tgt))
2132                                 RETURN(PTR_ERR(src_tgt));
2133                 } else {
2134                         src_tgt = lmv_find_target(lmv, &op_data->op_fid1);
2135                         if (IS_ERR(src_tgt))
2136                                 RETURN(PTR_ERR(src_tgt));
2137
2138                         op_data->op_mds = src_tgt->ltd_idx;
2139                 }
2140
2141                 if (op_data->op_mea2) {
2142                         struct lmv_stripe_md    *lsm = op_data->op_mea2;
2143                         const struct lmv_oinfo  *oinfo;
2144
2145                         oinfo = lsm_name_to_stripe_info(lsm, new, newlen);
2146                         if (IS_ERR(oinfo))
2147                                 RETURN(PTR_ERR(oinfo));
2148
2149                         op_data->op_fid2 = oinfo->lmo_fid;
2150                 }
2151         }
2152         if (IS_ERR(src_tgt))
2153                 RETURN(PTR_ERR(src_tgt));
2154
2155         /*
2156          * LOOKUP lock on src child (fid3) should also be cancelled for
2157          * src_tgt in mdc_rename.
2158          */
2159         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2160
2161         /*
2162          * Cancel UPDATE locks on tgt parent (fid2), tgt_tgt is its
2163          * own target.
2164          */
2165         rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2166                               LCK_EX, MDS_INODELOCK_UPDATE,
2167                               MF_MDC_CANCEL_FID2);
2168
2169         if (rc != 0)
2170                 RETURN(rc);
2171         /*
2172          * Cancel LOOKUP locks on source child (fid3) for parent tgt_tgt.
2173          */
2174         if (fid_is_sane(&op_data->op_fid3)) {
2175                 struct lmv_tgt_desc *tgt;
2176
2177                 tgt = lmv_find_target(lmv, &op_data->op_fid1);
2178                 if (IS_ERR(tgt))
2179                         RETURN(PTR_ERR(tgt));
2180
2181                 /* Cancel LOOKUP lock on its parent */
2182                 rc = lmv_early_cancel(exp, tgt, op_data, src_tgt->ltd_idx,
2183                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2184                                       MF_MDC_CANCEL_FID3);
2185                 if (rc != 0)
2186                         RETURN(rc);
2187
2188                 rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2189                                       LCK_EX, MDS_INODELOCK_FULL,
2190                                       MF_MDC_CANCEL_FID3);
2191                 if (rc != 0)
2192                         RETURN(rc);
2193         }
2194
2195         /*
2196          * Cancel all the locks on tgt child (fid4).
2197          */
2198         if (fid_is_sane(&op_data->op_fid4))
2199                 rc = lmv_early_cancel(exp, NULL, op_data, src_tgt->ltd_idx,
2200                                       LCK_EX, MDS_INODELOCK_FULL,
2201                                       MF_MDC_CANCEL_FID4);
2202
2203         CDEBUG(D_INODE, DFID":m%d to "DFID"\n", PFID(&op_data->op_fid1),
2204                op_data->op_mds, PFID(&op_data->op_fid2));
2205
2206         rc = md_rename(src_tgt->ltd_exp, op_data, old, oldlen, new, newlen,
2207                        request);
2208
2209         RETURN(rc);
2210 }
2211
2212 static int lmv_setattr(struct obd_export *exp, struct md_op_data *op_data,
2213                        void *ea, int ealen, void *ea2, int ea2len,
2214                        struct ptlrpc_request **request,
2215                        struct md_open_data **mod)
2216 {
2217         struct obd_device       *obd = exp->exp_obd;
2218         struct lmv_obd          *lmv = &obd->u.lmv;
2219         struct lmv_tgt_desc     *tgt;
2220         int                      rc = 0;
2221         ENTRY;
2222
2223         rc = lmv_check_connect(obd);
2224         if (rc)
2225                 RETURN(rc);
2226
2227         CDEBUG(D_INODE, "SETATTR for "DFID", valid 0x%x\n",
2228                PFID(&op_data->op_fid1), op_data->op_attr.ia_valid);
2229
2230         op_data->op_flags |= MF_MDC_CANCEL_FID1;
2231         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2232         if (IS_ERR(tgt))
2233                 RETURN(PTR_ERR(tgt));
2234
2235         rc = md_setattr(tgt->ltd_exp, op_data, ea, ealen, ea2,
2236                         ea2len, request, mod);
2237
2238         RETURN(rc);
2239 }
2240
2241 static int lmv_fsync(struct obd_export *exp, const struct lu_fid *fid,
2242                      struct obd_capa *oc, struct ptlrpc_request **request)
2243 {
2244         struct obd_device       *obd = exp->exp_obd;
2245         struct lmv_obd          *lmv = &obd->u.lmv;
2246         struct lmv_tgt_desc     *tgt;
2247         int                      rc;
2248         ENTRY;
2249
2250         rc = lmv_check_connect(obd);
2251         if (rc != 0)
2252                 RETURN(rc);
2253
2254         tgt = lmv_find_target(lmv, fid);
2255         if (IS_ERR(tgt))
2256                 RETURN(PTR_ERR(tgt));
2257
2258         rc = md_fsync(tgt->ltd_exp, fid, oc, request);
2259         RETURN(rc);
2260 }
2261
2262 /*
2263  * Adjust a set of pages, each page containing an array of lu_dirpages,
2264  * so that each page can be used as a single logical lu_dirpage.
2265  *
2266  * A lu_dirpage is laid out as follows, where s = ldp_hash_start,
2267  * e = ldp_hash_end, f = ldp_flags, p = padding, and each "ent" is a
2268  * struct lu_dirent.  It has size up to LU_PAGE_SIZE. The ldp_hash_end
2269  * value is used as a cookie to request the next lu_dirpage in a
2270  * directory listing that spans multiple pages (two in this example):
2271  *   ________
2272  *  |        |
2273  * .|--------v-------   -----.
2274  * |s|e|f|p|ent|ent| ... |ent|
2275  * '--|--------------   -----'   Each CFS_PAGE contains a single
2276  *    '------.                   lu_dirpage.
2277  * .---------v-------   -----.
2278  * |s|e|f|p|ent| 0 | ... | 0 |
2279  * '-----------------   -----'
2280  *
2281  * However, on hosts where the native VM page size (PAGE_CACHE_SIZE) is
2282  * larger than LU_PAGE_SIZE, a single host page may contain multiple
2283  * lu_dirpages. After reading the lu_dirpages from the MDS, the
2284  * ldp_hash_end of the first lu_dirpage refers to the one immediately
2285  * after it in the same CFS_PAGE (arrows simplified for brevity, but
2286  * in general e0==s1, e1==s2, etc.):
2287  *
2288  * .--------------------   -----.
2289  * |s0|e0|f0|p|ent|ent| ... |ent|
2290  * |---v----------------   -----|
2291  * |s1|e1|f1|p|ent|ent| ... |ent|
2292  * |---v----------------   -----|  Here, each CFS_PAGE contains
2293  *             ...                 multiple lu_dirpages.
2294  * |---v----------------   -----|
2295  * |s'|e'|f'|p|ent|ent| ... |ent|
2296  * '---|----------------   -----'
2297  *     v
2298  * .----------------------------.
2299  * |        next CFS_PAGE       |
2300  *
2301  * This structure is transformed into a single logical lu_dirpage as follows:
2302  *
2303  * - Replace e0 with e' so the request for the next lu_dirpage gets the page
2304  *   labeled 'next CFS_PAGE'.
2305  *
2306  * - Copy the LDF_COLLIDE flag from f' to f0 to correctly reflect whether
2307  *   a hash collision with the next page exists.
2308  *
2309  * - Adjust the lde_reclen of the ending entry of each lu_dirpage to span
2310  *   to the first entry of the next lu_dirpage.
2311  */
2312 #if PAGE_CACHE_SIZE > LU_PAGE_SIZE
2313 static void lmv_adjust_dirpages(struct page **pages, int ncfspgs, int nlupgs)
2314 {
2315         int i;
2316
2317         for (i = 0; i < ncfspgs; i++) {
2318                 struct lu_dirpage       *dp = kmap(pages[i]);
2319                 struct lu_dirpage       *first = dp;
2320                 struct lu_dirent        *end_dirent = NULL;
2321                 struct lu_dirent        *ent;
2322                 __u64                   hash_end = dp->ldp_hash_end;
2323                 __u32                   flags = dp->ldp_flags;
2324
2325                 while (--nlupgs > 0) {
2326                         ent = lu_dirent_start(dp);
2327                         for (end_dirent = ent; ent != NULL;
2328                              end_dirent = ent, ent = lu_dirent_next(ent));
2329
2330                         /* Advance dp to next lu_dirpage. */
2331                         dp = (struct lu_dirpage *)((char *)dp + LU_PAGE_SIZE);
2332
2333                         /* Check if we've reached the end of the CFS_PAGE. */
2334                         if (!((unsigned long)dp & ~CFS_PAGE_MASK))
2335                                 break;
2336
2337                         /* Save the hash and flags of this lu_dirpage. */
2338                         hash_end = dp->ldp_hash_end;
2339                         flags = dp->ldp_flags;
2340
2341                         /* Check if lu_dirpage contains no entries. */
2342                         if (!end_dirent)
2343                                 break;
2344
2345                         /* Enlarge the end entry lde_reclen from 0 to
2346                          * first entry of next lu_dirpage. */
2347                         LASSERT(le16_to_cpu(end_dirent->lde_reclen) == 0);
2348                         end_dirent->lde_reclen =
2349                                 cpu_to_le16((char *)(dp->ldp_entries) -
2350                                             (char *)end_dirent);
2351                 }
2352
2353                 first->ldp_hash_end = hash_end;
2354                 first->ldp_flags &= ~cpu_to_le32(LDF_COLLIDE);
2355                 first->ldp_flags |= flags & cpu_to_le32(LDF_COLLIDE);
2356
2357                 kunmap(pages[i]);
2358         }
2359         LASSERTF(nlupgs == 0, "left = %d", nlupgs);
2360 }
2361 #else
2362 #define lmv_adjust_dirpages(pages, ncfspgs, nlupgs) do {} while (0)
2363 #endif  /* PAGE_CACHE_SIZE > LU_PAGE_SIZE */
2364
2365 /**
2366  * Get current minimum entry from striped directory
2367  *
2368  * This function will search the dir entry, whose hash value is the
2369  * closest(>=) to @hash_offset, from all of sub-stripes, and it is
2370  * only being called for striped directory.
2371  *
2372  * \param[in] exp               export of LMV
2373  * \param[in] op_data           parameters transferred beween client MD stack
2374  *                              stripe_information will be included in this
2375  *                              parameter
2376  * \param[in] cb_op             ldlm callback being used in enqueue in
2377  *                              mdc_read_page
2378  * \param[in] hash_offset       the hash value, which is used to locate
2379  *                              minum(closet) dir entry
2380  * \param[in|out] stripe_offset the caller use this to indicate the stripe
2381  *                              index of last entry, so to avoid hash conflict
2382  *                              between stripes. It will also be used to
2383  *                              return the stripe index of current dir entry.
2384  * \param[in|out] entp          the minum entry and it also is being used
2385  *                              to input the last dir entry to resolve the
2386  *                              hash conflict
2387  *
2388  * \param[out] ppage            the page which holds the minum entry
2389  *
2390  * \retval                      = 0 get the entry successfully
2391  *                              negative errno (< 0) does not get the entry
2392  */
2393 static int lmv_get_min_striped_entry(struct obd_export *exp,
2394                                      struct md_op_data *op_data,
2395                                      struct md_callback *cb_op,
2396                                      __u64 hash_offset, int *stripe_offset,
2397                                      struct lu_dirent **entp,
2398                                      struct page **ppage)
2399 {
2400         struct obd_device       *obd = exp->exp_obd;
2401         struct lmv_obd          *lmv = &obd->u.lmv;
2402         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2403         struct lmv_tgt_desc     *tgt;
2404         int                     stripe_count;
2405         struct lu_dirent        *min_ent = NULL;
2406         struct page             *min_page = NULL;
2407         int                     min_idx = 0;
2408         int                     i;
2409         int                     rc = 0;
2410         ENTRY;
2411
2412         stripe_count = lsm->lsm_md_stripe_count;
2413         for (i = 0; i < stripe_count; i++) {
2414                 struct lu_dirent        *ent = NULL;
2415                 struct page             *page = NULL;
2416                 struct lu_dirpage       *dp;
2417                 __u64                   stripe_hash = hash_offset;
2418
2419                 tgt = lmv_get_target(lmv, lsm->lsm_md_oinfo[i].lmo_mds, NULL);
2420                 if (IS_ERR(tgt))
2421                         GOTO(out, rc = PTR_ERR(tgt));
2422
2423                 /* op_data will be shared by each stripe, so we need
2424                  * reset these value for each stripe */
2425                 op_data->op_stripe_offset = i;
2426                 op_data->op_fid1 = lsm->lsm_md_oinfo[i].lmo_fid;
2427                 op_data->op_fid2 = lsm->lsm_md_oinfo[i].lmo_fid;
2428                 op_data->op_data = lsm->lsm_md_oinfo[i].lmo_root;
2429 next:
2430                 rc = md_read_page(tgt->ltd_exp, op_data, cb_op, stripe_hash,
2431                                   &page);
2432                 if (rc != 0)
2433                         GOTO(out, rc);
2434
2435                 dp = page_address(page);
2436                 for (ent = lu_dirent_start(dp); ent != NULL;
2437                      ent = lu_dirent_next(ent)) {
2438                         /* Skip dummy entry */
2439                         if (le16_to_cpu(ent->lde_namelen) == 0)
2440                                 continue;
2441
2442                         if (le64_to_cpu(ent->lde_hash) < hash_offset)
2443                                 continue;
2444
2445                         if (le64_to_cpu(ent->lde_hash) == hash_offset &&
2446                             (*entp == ent || i < *stripe_offset))
2447                                 continue;
2448
2449                         /* skip . and .. for other stripes */
2450                         if (i != 0 &&
2451                             (strncmp(ent->lde_name, ".",
2452                                      le16_to_cpu(ent->lde_namelen)) == 0 ||
2453                              strncmp(ent->lde_name, "..",
2454                                      le16_to_cpu(ent->lde_namelen)) == 0))
2455                                 continue;
2456                         break;
2457                 }
2458
2459                 if (ent == NULL) {
2460                         stripe_hash = le64_to_cpu(dp->ldp_hash_end);
2461
2462                         kunmap(page);
2463                         page_cache_release(page);
2464                         page = NULL;
2465
2466                         /* reach the end of current stripe, go to next stripe */
2467                         if (stripe_hash == MDS_DIR_END_OFF)
2468                                 continue;
2469                         else
2470                                 goto next;
2471                 }
2472
2473                 if (min_ent != NULL) {
2474                         if (le64_to_cpu(min_ent->lde_hash) >
2475                             le64_to_cpu(ent->lde_hash)) {
2476                                 min_ent = ent;
2477                                 kunmap(min_page);
2478                                 page_cache_release(min_page);
2479                                 min_idx = i;
2480                                 min_page = page;
2481                         } else {
2482                                 kunmap(page);
2483                                 page_cache_release(page);
2484                                 page = NULL;
2485                         }
2486                 } else {
2487                         min_ent = ent;
2488                         min_page = page;
2489                         min_idx = i;
2490                 }
2491         }
2492
2493 out:
2494         if (*ppage != NULL) {
2495                 kunmap(*ppage);
2496                 page_cache_release(*ppage);
2497         }
2498         *stripe_offset = min_idx;
2499         *entp = min_ent;
2500         *ppage = min_page;
2501         RETURN(rc);
2502 }
2503
2504 /**
2505  * Build dir entry page from a striped directory
2506  *
2507  * This function gets one entry by @offset from a striped directory. It will
2508  * read entries from all of stripes, and choose one closest to the required
2509  * offset(&offset). A few notes
2510  * 1. skip . and .. for non-zero stripes, because there can only have one .
2511  * and .. in a directory.
2512  * 2. op_data will be shared by all of stripes, instead of allocating new
2513  * one, so need to restore before reusing.
2514  * 3. release the entry page if that is not being chosen.
2515  *
2516  * \param[in] exp       obd export refer to LMV
2517  * \param[in] op_data   hold those MD parameters of read_entry
2518  * \param[in] cb_op     ldlm callback being used in enqueue in mdc_read_entry
2519  * \param[out] ldp      the entry being read
2520  * \param[out] ppage    the page holding the entry. Note: because the entry
2521  *                      will be accessed in upper layer, so we need hold the
2522  *                      page until the usages of entry is finished, see
2523  *                      ll_dir_entry_next.
2524  *
2525  * retval               =0 if get entry successfully
2526  *                      <0 cannot get entry
2527  */
2528 static int lmv_read_striped_page(struct obd_export *exp,
2529                                  struct md_op_data *op_data,
2530                                  struct md_callback *cb_op,
2531                                  __u64 offset, struct page **ppage)
2532 {
2533         struct obd_device       *obd = exp->exp_obd;
2534         struct lu_fid           master_fid = op_data->op_fid1;
2535         struct inode            *master_inode = op_data->op_data;
2536         __u64                   hash_offset = offset;
2537         struct lu_dirpage       *dp;
2538         struct page             *min_ent_page = NULL;
2539         struct page             *ent_page = NULL;
2540         struct lu_dirent        *ent;
2541         void                    *area;
2542         int                     ent_idx = 0;
2543         struct lu_dirent        *min_ent = NULL;
2544         struct lu_dirent        *last_ent;
2545         int                     left_bytes;
2546         int                     rc;
2547         ENTRY;
2548
2549         rc = lmv_check_connect(obd);
2550         if (rc)
2551                 RETURN(rc);
2552
2553         /* Allocate a page and read entries from all of stripes and fill
2554          * the page by hash order */
2555         ent_page = alloc_page(GFP_KERNEL);
2556         if (ent_page == NULL)
2557                 RETURN(-ENOMEM);
2558
2559         /* Initialize the entry page */
2560         dp = kmap(ent_page);
2561         memset(dp, 0, sizeof(*dp));
2562         dp->ldp_hash_start = cpu_to_le64(offset);
2563         dp->ldp_flags |= LDF_COLLIDE;
2564
2565         area = dp + 1;
2566         left_bytes = PAGE_CACHE_SIZE - sizeof(*dp);
2567         ent = area;
2568         last_ent = ent;
2569         do {
2570                 __u16   ent_size;
2571
2572                 /* Find the minum entry from all sub-stripes */
2573                 rc = lmv_get_min_striped_entry(exp, op_data, cb_op, hash_offset,
2574                                                &ent_idx, &min_ent,
2575                                                &min_ent_page);
2576                 if (rc != 0)
2577                         GOTO(out, rc);
2578
2579                 /* If it can not get minum entry, it means it already reaches
2580                  * the end of this directory */
2581                 if (min_ent == NULL) {
2582                         last_ent->lde_reclen = 0;
2583                         hash_offset = MDS_DIR_END_OFF;
2584                         GOTO(out, rc);
2585                 }
2586
2587                 ent_size = le16_to_cpu(min_ent->lde_reclen);
2588
2589                 /* the last entry lde_reclen is 0, but it might not
2590                  * the end of this entry of this temporay entry */
2591                 if (ent_size == 0)
2592                         ent_size = lu_dirent_calc_size(
2593                                         le16_to_cpu(min_ent->lde_namelen),
2594                                         le32_to_cpu(min_ent->lde_attrs));
2595                 if (ent_size > left_bytes) {
2596                         last_ent->lde_reclen = cpu_to_le16(0);
2597                         hash_offset = le64_to_cpu(min_ent->lde_hash);
2598                         GOTO(out, rc);
2599                 }
2600
2601                 memcpy(ent, min_ent, ent_size);
2602
2603                 /* Replace . with master FID and Replace .. with the parent FID
2604                  * of master object */
2605                 if (strncmp(ent->lde_name, ".",
2606                             le16_to_cpu(ent->lde_namelen)) == 0 &&
2607                     le16_to_cpu(ent->lde_namelen) == 1)
2608                         fid_cpu_to_le(&ent->lde_fid, &master_fid);
2609                 else if (strncmp(ent->lde_name, "..",
2610                                    le16_to_cpu(ent->lde_namelen)) == 0 &&
2611                            le16_to_cpu(ent->lde_namelen) == 2)
2612                         fid_cpu_to_le(&ent->lde_fid, &op_data->op_fid3);
2613
2614                 left_bytes -= ent_size;
2615                 ent->lde_reclen = cpu_to_le16(ent_size);
2616                 last_ent = ent;
2617                 ent = (void *)ent + ent_size;
2618                 hash_offset = le64_to_cpu(min_ent->lde_hash);
2619                 if (hash_offset == MDS_DIR_END_OFF) {
2620                         last_ent->lde_reclen = 0;
2621                         break;
2622                 }
2623         } while (1);
2624 out:
2625         if (min_ent_page != NULL) {
2626                 kunmap(min_ent_page);
2627                 page_cache_release(min_ent_page);
2628         }
2629
2630         if (unlikely(rc != 0)) {
2631                 __free_page(ent_page);
2632                 ent_page = NULL;
2633         } else {
2634                 if (ent == area)
2635                         dp->ldp_flags |= LDF_EMPTY;
2636                 dp->ldp_flags = cpu_to_le32(dp->ldp_flags);
2637                 dp->ldp_hash_end = cpu_to_le64(hash_offset);
2638         }
2639
2640         /* We do not want to allocate md_op_data during each
2641          * dir entry reading, so op_data will be shared by every stripe,
2642          * then we need to restore it back to original value before
2643          * return to the upper layer */
2644         op_data->op_fid1 = master_fid;
2645         op_data->op_fid2 = master_fid;
2646         op_data->op_data = master_inode;
2647
2648         *ppage = ent_page;
2649
2650         RETURN(rc);
2651 }
2652
2653 int lmv_read_page(struct obd_export *exp, struct md_op_data *op_data,
2654                   struct md_callback *cb_op, __u64 offset,
2655                   struct page **ppage)
2656 {
2657         struct obd_device       *obd = exp->exp_obd;
2658         struct lmv_obd          *lmv = &obd->u.lmv;
2659         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2660         struct lmv_tgt_desc     *tgt;
2661         int                     rc;
2662         ENTRY;
2663
2664         rc = lmv_check_connect(obd);
2665         if (rc != 0)
2666                 RETURN(rc);
2667
2668         if (unlikely(lsm != NULL)) {
2669                 rc = lmv_read_striped_page(exp, op_data, cb_op, offset, ppage);
2670                 RETURN(rc);
2671         }
2672
2673         tgt = lmv_find_target(lmv, &op_data->op_fid1);
2674         if (IS_ERR(tgt))
2675                 RETURN(PTR_ERR(tgt));
2676
2677         rc = md_read_page(tgt->ltd_exp, op_data, cb_op, offset, ppage);
2678
2679         RETURN(rc);
2680 }
2681
2682 /**
2683  * Unlink a file/directory
2684  *
2685  * Unlink a file or directory under the parent dir. The unlink request
2686  * usually will be sent to the MDT where the child is located, but if
2687  * the client does not have the child FID then request will be sent to the
2688  * MDT where the parent is located.
2689  *
2690  * If the parent is a striped directory then it also needs to locate which
2691  * stripe the name of the child is located, and replace the parent FID
2692  * (@op->op_fid1) with the stripe FID. Note: if the stripe is unknown,
2693  * it will walk through all of sub-stripes until the child is being
2694  * unlinked finally.
2695  *
2696  * \param[in] exp       export refer to LMV
2697  * \param[in] op_data   different parameters transferred beween client
2698  *                      MD stacks, name, namelen, FIDs etc.
2699  *                      op_fid1 is the parent FID, op_fid2 is the child
2700  *                      FID.
2701  * \param[out] request  point to the request of unlink.
2702  *
2703  * retval               0 if succeed
2704  *                      negative errno if failed.
2705  */
2706 static int lmv_unlink(struct obd_export *exp, struct md_op_data *op_data,
2707                       struct ptlrpc_request **request)
2708 {
2709         struct obd_device       *obd = exp->exp_obd;
2710         struct lmv_obd          *lmv = &obd->u.lmv;
2711         struct lmv_tgt_desc     *tgt = NULL;
2712         struct lmv_tgt_desc     *parent_tgt = NULL;
2713         struct mdt_body         *body;
2714         int                     rc;
2715         int                     stripe_index = 0;
2716         struct lmv_stripe_md    *lsm = op_data->op_mea1;
2717         ENTRY;
2718
2719         rc = lmv_check_connect(obd);
2720         if (rc)
2721                 RETURN(rc);
2722 retry_unlink:
2723         /* For striped dir, we need to locate the parent as well */
2724         if (lsm != NULL) {
2725                 struct lmv_tgt_desc *tmp;
2726
2727                 LASSERT(op_data->op_name != NULL &&
2728                         op_data->op_namelen != 0);
2729
2730                 tmp = lmv_locate_target_for_name(lmv, lsm,
2731                                                  op_data->op_name,
2732                                                  op_data->op_namelen,
2733                                                  &op_data->op_fid1,
2734                                                  &op_data->op_mds);
2735
2736                 /* return -EBADFD means unknown hash type, might
2737                  * need try all sub-stripe here */
2738                 if (IS_ERR(tmp) && PTR_ERR(tmp) != -EBADFD)
2739                         RETURN(PTR_ERR(tmp));
2740
2741                 /* Note: both migrating dir and unknown hash dir need to
2742                  * try all of sub-stripes, so we need start search the
2743                  * name from stripe 0, but migrating dir is already handled
2744                  * inside lmv_locate_target_for_name(), so we only check
2745                  * unknown hash type directory here */
2746                 if (!lmv_is_known_hash_type(lsm)) {
2747                         struct lmv_oinfo *oinfo;
2748
2749                         oinfo = &lsm->lsm_md_oinfo[stripe_index];
2750
2751                         op_data->op_fid1 = oinfo->lmo_fid;
2752                         op_data->op_mds = oinfo->lmo_mds;
2753                 }
2754         }
2755
2756 try_next_stripe:
2757         /* Send unlink requests to the MDT where the child is located */
2758         if (likely(!fid_is_zero(&op_data->op_fid2)))
2759                 tgt = lmv_find_target(lmv, &op_data->op_fid2);
2760         else if (lsm != NULL)
2761                 tgt = lmv_get_target(lmv, op_data->op_mds, NULL);
2762         else
2763                 tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
2764
2765         if (IS_ERR(tgt))
2766                 RETURN(PTR_ERR(tgt));
2767
2768         op_data->op_fsuid = from_kuid(&init_user_ns, current_fsuid());
2769         op_data->op_fsgid = from_kgid(&init_user_ns, current_fsgid());
2770         op_data->op_cap = cfs_curproc_cap_pack();
2771
2772         /*
2773          * If child's fid is given, cancel unused locks for it if it is from
2774          * another export than parent.
2775          *
2776          * LOOKUP lock for child (fid3) should also be cancelled on parent
2777          * tgt_tgt in mdc_unlink().
2778          */
2779         op_data->op_flags |= MF_MDC_CANCEL_FID1 | MF_MDC_CANCEL_FID3;
2780
2781         /*
2782          * Cancel FULL locks on child (fid3).
2783          */
2784         parent_tgt = lmv_find_target(lmv, &op_data->op_fid1);
2785         if (IS_ERR(parent_tgt))
2786                 RETURN(PTR_ERR(parent_tgt));
2787
2788         if (parent_tgt != tgt) {
2789                 rc = lmv_early_cancel(exp, parent_tgt, op_data, tgt->ltd_idx,
2790                                       LCK_EX, MDS_INODELOCK_LOOKUP,
2791                                       MF_MDC_CANCEL_FID3);
2792         }
2793
2794         rc = lmv_early_cancel(exp, NULL, op_data, tgt->ltd_idx, LCK_EX,
2795                               MDS_INODELOCK_FULL, MF_MDC_CANCEL_FID3);
2796         if (rc != 0)
2797                 RETURN(rc);
2798
2799         CDEBUG(D_INODE, "unlink with fid="DFID"/"DFID" -> mds #%d\n",
2800                PFID(&op_data->op_fid1), PFID(&op_data->op_fid2), tgt->ltd_idx);
2801
2802         rc = md_unlink(tgt->ltd_exp, op_data, request);
2803         if (rc != 0 && rc != -EREMOTE && rc != -ENOENT)
2804                 RETURN(rc);
2805
2806         /* Try next stripe if it is needed. */
2807         if (rc == -ENOENT && lsm != NULL && lmv_need_try_all_stripes(lsm)) {
2808                 struct lmv_oinfo *oinfo;
2809
2810                 stripe_index++;
2811                 if (stripe_index >= lsm->lsm_md_stripe_count)
2812                         RETURN(rc);
2813
2814                 oinfo = &lsm->lsm_md_oinfo[stripe_index];
2815
2816                 op_data->op_fid1 = oinfo->lmo_fid;
2817                 op_data->op_mds = oinfo->lmo_mds;
2818
2819                 ptlrpc_req_finished(*request);
2820                 *request = NULL;
2821
2822                 goto try_next_stripe;
2823         }
2824
2825         body = req_capsule_server_get(&(*request)->rq_pill, &RMF_MDT_BODY);
2826         if (body == NULL)
2827                 RETURN(-EPROTO);
2828
2829         /* Not cross-ref case, just get out of here. */
2830         if (likely(!(body->mbo_valid & OBD_MD_MDS)))
2831                 RETURN(0);
2832
2833         CDEBUG(D_INODE, "%s: try unlink to another MDT for "DFID"\n",
2834                exp->exp_obd->obd_name, PFID(&body->mbo_fid1));
2835
2836         /* This is a remote object, try remote MDT, Note: it may
2837          * try more than 1 time here, Considering following case
2838          * /mnt/lustre is root on MDT0, remote1 is on MDT1
2839          * 1. Initially A does not know where remote1 is, it send
2840          *    unlink RPC to MDT0, MDT0 return -EREMOTE, it will
2841          *    resend unlink RPC to MDT1 (retry 1st time).
2842          *
2843          * 2. During the unlink RPC in flight,
2844          *    client B mv /mnt/lustre/remote1 /mnt/lustre/remote2
2845          *    and create new remote1, but on MDT0
2846          *
2847          * 3. MDT1 get unlink RPC(from A), then do remote lock on
2848          *    /mnt/lustre, then lookup get fid of remote1, and find
2849          *    it is remote dir again, and replay -EREMOTE again.
2850          *
2851          * 4. Then A will resend unlink RPC to MDT0. (retry 2nd times).
2852          *
2853          * In theory, it might try unlimited time here, but it should
2854          * be very rare case.  */
2855         op_data->op_fid2 = body->mbo_fid1;
2856         ptlrpc_req_finished(*request);
2857         *request = NULL;
2858
2859         goto retry_unlink;
2860 }
2861
2862 static int lmv_precleanup(struct obd_device *obd, enum obd_cleanup_stage stage)
2863 {
2864         struct lmv_obd *lmv = &obd->u.lmv;
2865         int rc = 0;
2866
2867         switch (stage) {
2868         case OBD_CLEANUP_EARLY:
2869                 /* XXX: here should be calling obd_precleanup() down to
2870                  * stack. */
2871                 break;
2872         case OBD_CLEANUP_EXPORTS:
2873                 fld_client_proc_fini(&lmv->lmv_fld);
2874                 lprocfs_obd_cleanup(obd);
2875                 lprocfs_free_md_stats(obd);
2876                 break;
2877         default:
2878                 break;
2879         }
2880         RETURN(rc);
2881 }
2882
2883 static int lmv_get_info(const struct lu_env *env, struct obd_export *exp,
2884                         __u32 keylen, void *key, __u32 *vallen, void *val,
2885                         struct lov_stripe_md *lsm)
2886 {
2887         struct obd_device       *obd;
2888         struct lmv_obd          *lmv;
2889         int                      rc = 0;
2890         ENTRY;
2891
2892         obd = class_exp2obd(exp);
2893         if (obd == NULL) {
2894                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2895                        exp->exp_handle.h_cookie);
2896                 RETURN(-EINVAL);
2897         }
2898
2899         lmv = &obd->u.lmv;
2900         if (keylen >= strlen("remote_flag") && !strcmp(key, "remote_flag")) {
2901                 int i;
2902
2903                 rc = lmv_check_connect(obd);
2904                 if (rc)
2905                         RETURN(rc);
2906
2907                 LASSERT(*vallen == sizeof(__u32));
2908                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2909                         struct lmv_tgt_desc *tgt = lmv->tgts[i];
2910                         /*
2911                          * All tgts should be connected when this gets called.
2912                          */
2913                         if (tgt == NULL || tgt->ltd_exp == NULL)
2914                                 continue;
2915
2916                         if (!obd_get_info(env, tgt->ltd_exp, keylen, key,
2917                                           vallen, val, NULL))
2918                                 RETURN(0);
2919                 }
2920                 RETURN(-EINVAL);
2921         } else if (KEY_IS(KEY_MAX_EASIZE) ||
2922                    KEY_IS(KEY_DEFAULT_EASIZE) ||
2923                    KEY_IS(KEY_MAX_COOKIESIZE) ||
2924                    KEY_IS(KEY_DEFAULT_COOKIESIZE) ||
2925                    KEY_IS(KEY_CONN_DATA)) {
2926                 rc = lmv_check_connect(obd);
2927                 if (rc)
2928                         RETURN(rc);
2929
2930                 /*
2931                  * Forwarding this request to first MDS, it should know LOV
2932                  * desc.
2933                  */
2934                 rc = obd_get_info(env, lmv->tgts[0]->ltd_exp, keylen, key,
2935                                   vallen, val, NULL);
2936                 if (!rc && KEY_IS(KEY_CONN_DATA))
2937                         exp->exp_connect_data = *(struct obd_connect_data *)val;
2938                 RETURN(rc);
2939         } else if (KEY_IS(KEY_TGT_COUNT)) {
2940                 *((int *)val) = lmv->desc.ld_tgt_count;
2941                 RETURN(0);
2942         }
2943
2944         CDEBUG(D_IOCTL, "Invalid key\n");
2945         RETURN(-EINVAL);
2946 }
2947
2948 int lmv_set_info_async(const struct lu_env *env, struct obd_export *exp,
2949                        obd_count keylen, void *key, obd_count vallen,
2950                        void *val, struct ptlrpc_request_set *set)
2951 {
2952         struct lmv_tgt_desc    *tgt = NULL;
2953         struct obd_device      *obd;
2954         struct lmv_obd         *lmv;
2955         int rc = 0;
2956         ENTRY;
2957
2958         obd = class_exp2obd(exp);
2959         if (obd == NULL) {
2960                 CDEBUG(D_IOCTL, "Invalid client cookie "LPX64"\n",
2961                        exp->exp_handle.h_cookie);
2962                 RETURN(-EINVAL);
2963         }
2964         lmv = &obd->u.lmv;
2965
2966         if (KEY_IS(KEY_READ_ONLY) || KEY_IS(KEY_FLUSH_CTX)) {
2967                 int i, err = 0;
2968
2969                 for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
2970                         tgt = lmv->tgts[i];
2971
2972                         if (tgt == NULL || tgt->ltd_exp == NULL)
2973                                 continue;
2974
2975                         err = obd_set_info_async(env, tgt->ltd_exp,
2976                                                  keylen, key, vallen, val, set);
2977                         if (err && rc == 0)
2978                                 rc = err;
2979                 }
2980
2981                 RETURN(rc);
2982         }
2983
2984         RETURN(-EINVAL);
2985 }
2986
2987 static int lmv_pack_md_v1(const struct lmv_stripe_md *lsm,
2988                           struct lmv_mds_md_v1 *lmm1)
2989 {
2990         int     cplen;
2991         int     i;
2992
2993         lmm1->lmv_magic = cpu_to_le32(lsm->lsm_md_magic);
2994         lmm1->lmv_stripe_count = cpu_to_le32(lsm->lsm_md_stripe_count);
2995         lmm1->lmv_master_mdt_index = cpu_to_le32(lsm->lsm_md_master_mdt_index);
2996         lmm1->lmv_hash_type = cpu_to_le32(lsm->lsm_md_hash_type);
2997         cplen = strlcpy(lmm1->lmv_pool_name, lsm->lsm_md_pool_name,
2998                         sizeof(lmm1->lmv_pool_name));
2999         if (cplen >= sizeof(lmm1->lmv_pool_name))
3000                 return -E2BIG;
3001
3002         for (i = 0; i < lsm->lsm_md_stripe_count; i++)
3003                 fid_cpu_to_le(&lmm1->lmv_stripe_fids[i],
3004                               &lsm->lsm_md_oinfo[i].lmo_fid);
3005         return 0;
3006 }
3007
3008 int lmv_pack_md(union lmv_mds_md **lmmp, const struct lmv_stripe_md *lsm,
3009                 int stripe_count)
3010 {
3011         int     lmm_size = 0;
3012         bool    allocated = false;
3013         int     rc = 0;
3014         ENTRY;
3015
3016         LASSERT(lmmp != NULL);
3017         /* Free lmm */
3018         if (*lmmp != NULL && lsm == NULL) {
3019                 int stripe_count;
3020
3021                 stripe_count = lmv_mds_md_stripe_count_get(*lmmp);
3022                 lmm_size = lmv_mds_md_size(stripe_count,
3023                                            le32_to_cpu((*lmmp)->lmv_magic));
3024                 if (lmm_size == 0)
3025                         RETURN(-EINVAL);
3026                 OBD_FREE(*lmmp, lmm_size);
3027                 *lmmp = NULL;
3028                 RETURN(0);
3029         }
3030
3031         /* Alloc lmm */
3032         if (*lmmp == NULL && lsm == NULL) {
3033                 lmm_size = lmv_mds_md_size(stripe_count, LMV_MAGIC);
3034                 LASSERT(lmm_size > 0);
3035                 OBD_ALLOC(*lmmp, lmm_size);
3036                 if (*lmmp == NULL)
3037                         RETURN(-ENOMEM);
3038                 lmv_mds_md_stripe_count_set(*lmmp, stripe_count);
3039                 (*lmmp)->lmv_magic = cpu_to_le32(LMV_MAGIC);
3040                 RETURN(lmm_size);
3041         }
3042
3043         /* pack lmm */
3044         LASSERT(lsm != NULL);
3045         lmm_size = lmv_mds_md_size(lsm->lsm_md_stripe_count, lsm->lsm_md_magic);
3046         if (*lmmp == NULL) {
3047                 OBD_ALLOC(*lmmp, lmm_size);
3048                 if (*lmmp == NULL)
3049                         RETURN(-ENOMEM);
3050                 allocated = true;
3051         }
3052
3053         switch (lsm->lsm_md_magic) {
3054         case LMV_MAGIC_V1:
3055                 rc = lmv_pack_md_v1(lsm, &(*lmmp)->lmv_md_v1);
3056                 break;
3057         default:
3058                 rc = -EINVAL;
3059                 break;
3060         }
3061
3062         if (rc != 0 && allocated) {
3063                 OBD_FREE(*lmmp, lmm_size);
3064                 *lmmp = NULL;
3065         }
3066
3067         RETURN(lmm_size);
3068 }
3069 EXPORT_SYMBOL(lmv_pack_md);
3070
3071 static int lmv_unpack_md_v1(struct obd_export *exp, struct lmv_stripe_md *lsm,
3072                             const struct lmv_mds_md_v1 *lmm1)
3073 {
3074         struct lmv_obd  *lmv = &exp->exp_obd->u.lmv;
3075         int             stripe_count;
3076         int             cplen;
3077         int             i;
3078         int             rc = 0;
3079         ENTRY;
3080
3081         lsm->lsm_md_magic = le32_to_cpu(lmm1->lmv_magic);
3082         lsm->lsm_md_stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
3083         lsm->lsm_md_master_mdt_index = le32_to_cpu(lmm1->lmv_master_mdt_index);
3084         if (OBD_FAIL_CHECK(OBD_FAIL_UNKNOWN_LMV_STRIPE))
3085                 lsm->lsm_md_hash_type = LMV_HASH_TYPE_UNKNOWN;
3086         else
3087                 lsm->lsm_md_hash_type = le32_to_cpu(lmm1->lmv_hash_type);
3088         lsm->lsm_md_layout_version = le32_to_cpu(lmm1->lmv_layout_version);
3089         cplen = strlcpy(lsm->lsm_md_pool_name, lmm1->lmv_pool_name,
3090                         sizeof(lsm->lsm_md_pool_name));
3091
3092         if (cplen >= sizeof(lsm->lsm_md_pool_name))
3093                 RETURN(-E2BIG);
3094
3095         CDEBUG(D_INFO, "unpack lsm count %d, master %d hash_type %d"
3096                "layout_version %d\n", lsm->lsm_md_stripe_count,
3097                lsm->lsm_md_master_mdt_index, lsm->lsm_md_hash_type,
3098                lsm->lsm_md_layout_version);
3099
3100         stripe_count = le32_to_cpu(lmm1->lmv_stripe_count);
3101         for (i = 0; i < le32_to_cpu(stripe_count); i++) {
3102                 fid_le_to_cpu(&lsm->lsm_md_oinfo[i].lmo_fid,
3103                               &lmm1->lmv_stripe_fids[i]);
3104                 rc = lmv_fld_lookup(lmv, &lsm->lsm_md_oinfo[i].lmo_fid,
3105                                     &lsm->lsm_md_oinfo[i].lmo_mds);
3106                 if (rc != 0)
3107                         RETURN(rc);
3108                 CDEBUG(D_INFO, "unpack fid #%d "DFID"\n", i,
3109                        PFID(&lsm->lsm_md_oinfo[i].lmo_fid));
3110         }
3111
3112         RETURN(rc);
3113 }
3114
3115 int lmv_unpack_md(struct obd_export *exp, struct lmv_stripe_md **lsmp,
3116                   const union lmv_mds_md *lmm, int stripe_count)
3117 {
3118         struct lmv_stripe_md     *lsm;
3119         int                      lsm_size;
3120         int                      rc;
3121         bool                     allocated = false;
3122         ENTRY;
3123
3124         LASSERT(lsmp != NULL);
3125
3126         lsm = *lsmp;
3127         /* Free memmd */
3128         if (lsm != NULL && lmm == NULL) {
3129                 int i;
3130                 for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
3131                         /* For migrating inode, the master stripe and master
3132                          * object will be the same, so do not need iput, see
3133                          * ll_update_lsm_md */
3134                         if (!(lsm->lsm_md_hash_type & LMV_HASH_FLAG_MIGRATION &&
3135                               i == 0) && lsm->lsm_md_oinfo[i].lmo_root != NULL)
3136                                 iput(lsm->lsm_md_oinfo[i].lmo_root);
3137                 }
3138                 lsm_size = lmv_stripe_md_size(lsm->lsm_md_stripe_count);
3139                 OBD_FREE(lsm, lsm_size);
3140                 *lsmp = NULL;
3141                 RETURN(0);
3142         }
3143
3144         /* Alloc memmd */
3145         if (lsm == NULL && lmm == NULL) {
3146                 lsm_size = lmv_stripe_md_size(stripe_count);
3147                 OBD_ALLOC(lsm, lsm_size);
3148                 if (lsm == NULL)
3149                         RETURN(-ENOMEM);
3150                 lsm->lsm_md_stripe_count = stripe_count;
3151                 *lsmp = lsm;
3152                 RETURN(0);
3153         }
3154
3155         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_STRIPE)
3156                 RETURN(-EPERM);
3157
3158         /* Unpack memmd */
3159         if (le32_to_cpu(lmm->lmv_magic) != LMV_MAGIC_V1 &&
3160             le32_to_cpu(lmm->lmv_magic) != LMV_USER_MAGIC) {
3161                 CERROR("%s: invalid lmv magic %x: rc = %d\n",
3162                        exp->exp_obd->obd_name, le32_to_cpu(lmm->lmv_magic),
3163                        -EIO);
3164                 RETURN(-EIO);
3165         }
3166
3167         if (le32_to_cpu(lmm->lmv_magic) == LMV_MAGIC_V1)
3168                 lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
3169         else
3170                 /**
3171                  * Unpack default dirstripe(lmv_user_md) to lmv_stripe_md,
3172                  * stripecount should be 0 then.
3173                  */
3174                 lsm_size = lmv_stripe_md_size(0);
3175
3176         lsm_size = lmv_stripe_md_size(lmv_mds_md_stripe_count_get(lmm));
3177         if (lsm == NULL) {
3178                 OBD_ALLOC(lsm, lsm_size);
3179                 if (lsm == NULL)
3180                         RETURN(-ENOMEM);
3181                 allocated = true;
3182                 *lsmp = lsm;
3183         }
3184
3185         switch (le32_to_cpu(lmm->lmv_magic)) {
3186         case LMV_MAGIC_V1:
3187                 rc = lmv_unpack_md_v1(exp, lsm, &lmm->lmv_md_v1);
3188                 break;
3189         default:
3190                 CERROR("%s: unrecognized magic %x\n", exp->exp_obd->obd_name,
3191                        le32_to_cpu(lmm->lmv_magic));
3192                 rc = -EINVAL;
3193                 break;
3194         }
3195
3196         if (rc != 0 && allocated) {
3197                 OBD_FREE(lsm, lsm_size);
3198                 *lsmp = NULL;
3199                 lsm_size = rc;
3200         }
3201         RETURN(lsm_size);
3202 }
3203
3204 int lmv_alloc_memmd(struct lmv_stripe_md **lsmp, int stripes)
3205 {
3206         return lmv_unpack_md(NULL, lsmp, NULL, stripes);
3207 }
3208 EXPORT_SYMBOL(lmv_alloc_memmd);
3209
3210 void lmv_free_memmd(struct lmv_stripe_md *lsm)
3211 {
3212         lmv_unpack_md(NULL, &lsm, NULL, 0);
3213 }
3214 EXPORT_SYMBOL(lmv_free_memmd);
3215
3216 int lmv_unpackmd(struct obd_export *exp, struct lov_stripe_md **lsmp,
3217                  struct lov_mds_md *lmm, int disk_len)
3218 {
3219         return lmv_unpack_md(exp, (struct lmv_stripe_md **)lsmp,
3220                              (union lmv_mds_md *)lmm, disk_len);
3221 }
3222
3223 int lmv_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
3224                struct lov_stripe_md *lsm)
3225 {
3226         struct obd_device               *obd = exp->exp_obd;
3227         struct lmv_obd                  *lmv_obd = &obd->u.lmv;
3228         const struct lmv_stripe_md      *lmv = (struct lmv_stripe_md *)lsm;
3229         int                             stripe_count;
3230
3231         if (lmmp == NULL) {
3232                 if (lsm != NULL)
3233                         stripe_count = lmv->lsm_md_stripe_count;
3234                 else
3235                         stripe_count = lmv_obd->desc.ld_tgt_count;
3236
3237                 return lmv_mds_md_size(stripe_count, LMV_MAGIC_V1);
3238         }
3239
3240         return lmv_pack_md((union lmv_mds_md **)lmmp, lmv, 0);
3241 }
3242
3243 static int lmv_cancel_unused(struct obd_export *exp, const struct lu_fid *fid,
3244                              ldlm_policy_data_t *policy, ldlm_mode_t mode,
3245                              ldlm_cancel_flags_t flags, void *opaque)
3246 {
3247         struct obd_device       *obd = exp->exp_obd;
3248         struct lmv_obd          *lmv = &obd->u.lmv;
3249         int                      rc = 0;
3250         int                      err;
3251         __u32                    i;
3252         ENTRY;
3253
3254         LASSERT(fid != NULL);
3255
3256         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3257                 struct lmv_tgt_desc *tgt = lmv->tgts[i];
3258
3259                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
3260                         continue;
3261
3262                 err = md_cancel_unused(tgt->ltd_exp, fid, policy, mode, flags,
3263                                        opaque);
3264                 if (!rc)
3265                         rc = err;
3266         }
3267         RETURN(rc);
3268 }
3269
3270 int lmv_set_lock_data(struct obd_export *exp, __u64 *lockh, void *data,
3271                       __u64 *bits)
3272 {
3273         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3274         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3275         int                      rc;
3276         ENTRY;
3277
3278         if (tgt == NULL || tgt->ltd_exp == NULL)
3279                 RETURN(-EINVAL);
3280         rc =  md_set_lock_data(tgt->ltd_exp, lockh, data, bits);
3281         RETURN(rc);
3282 }
3283
3284 ldlm_mode_t lmv_lock_match(struct obd_export *exp, __u64 flags,
3285                            const struct lu_fid *fid, ldlm_type_t type,
3286                            ldlm_policy_data_t *policy, ldlm_mode_t mode,
3287                            struct lustre_handle *lockh)
3288 {
3289         struct obd_device       *obd = exp->exp_obd;
3290         struct lmv_obd          *lmv = &obd->u.lmv;
3291         ldlm_mode_t             rc;
3292         int                     tgt;
3293         int                     i;
3294         ENTRY;
3295
3296         CDEBUG(D_INODE, "Lock match for "DFID"\n", PFID(fid));
3297
3298         /*
3299          * With DNE every object can have two locks in different namespaces:
3300          * lookup lock in space of MDT storing direntry and update/open lock in
3301          * space of MDT storing inode.  Try the MDT that the FID maps to first,
3302          * since this can be easily found, and only try others if that fails.
3303          */
3304         for (i = 0, tgt = lmv_find_target_index(lmv, fid);
3305              i < lmv->desc.ld_tgt_count;
3306              i++, tgt = (tgt + 1) % lmv->desc.ld_tgt_count) {
3307                 if (tgt < 0) {
3308                         CDEBUG(D_HA, "%s: "DFID" is inaccessible: rc = %d\n",
3309                                obd->obd_name, PFID(fid), tgt);
3310                         tgt = 0;
3311                 }
3312
3313                 if (lmv->tgts[tgt] == NULL ||
3314                     lmv->tgts[tgt]->ltd_exp == NULL ||
3315                     lmv->tgts[tgt]->ltd_active == 0)
3316                         continue;
3317
3318                 rc = md_lock_match(lmv->tgts[tgt]->ltd_exp, flags, fid,
3319                                    type, policy, mode, lockh);
3320                 if (rc)
3321                         RETURN(rc);
3322         }
3323
3324         RETURN(0);
3325 }
3326
3327 int lmv_get_lustre_md(struct obd_export *exp, struct ptlrpc_request *req,
3328                       struct obd_export *dt_exp, struct obd_export *md_exp,
3329                       struct lustre_md *md)
3330 {
3331         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3332         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3333
3334         if (tgt == NULL || tgt->ltd_exp == NULL)
3335                 RETURN(-EINVAL);
3336
3337         return md_get_lustre_md(lmv->tgts[0]->ltd_exp, req, dt_exp, md_exp, md);
3338 }
3339
3340 int lmv_free_lustre_md(struct obd_export *exp, struct lustre_md *md)
3341 {
3342         struct obd_device       *obd = exp->exp_obd;
3343         struct lmv_obd          *lmv = &obd->u.lmv;
3344         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3345         ENTRY;
3346
3347         if (md->lmv != NULL) {
3348                 lmv_free_memmd(md->lmv);
3349                 md->lmv = NULL;
3350         }
3351         if (tgt == NULL || tgt->ltd_exp == NULL)
3352                 RETURN(-EINVAL);
3353         RETURN(md_free_lustre_md(lmv->tgts[0]->ltd_exp, md));
3354 }
3355
3356 int lmv_set_open_replay_data(struct obd_export *exp,
3357                              struct obd_client_handle *och,
3358                              struct lookup_intent *it)
3359 {
3360         struct obd_device       *obd = exp->exp_obd;
3361         struct lmv_obd          *lmv = &obd->u.lmv;
3362         struct lmv_tgt_desc     *tgt;
3363         ENTRY;
3364
3365         tgt = lmv_find_target(lmv, &och->och_fid);
3366         if (IS_ERR(tgt))
3367                 RETURN(PTR_ERR(tgt));
3368
3369         RETURN(md_set_open_replay_data(tgt->ltd_exp, och, it));
3370 }
3371
3372 int lmv_clear_open_replay_data(struct obd_export *exp,
3373                                struct obd_client_handle *och)
3374 {
3375         struct obd_device       *obd = exp->exp_obd;
3376         struct lmv_obd          *lmv = &obd->u.lmv;
3377         struct lmv_tgt_desc     *tgt;
3378         ENTRY;
3379
3380         tgt = lmv_find_target(lmv, &och->och_fid);
3381         if (IS_ERR(tgt))
3382                 RETURN(PTR_ERR(tgt));
3383
3384         RETURN(md_clear_open_replay_data(tgt->ltd_exp, och));
3385 }
3386
3387 static int lmv_get_remote_perm(struct obd_export *exp,
3388                                const struct lu_fid *fid,
3389                                struct obd_capa *oc, __u32 suppgid,
3390                                struct ptlrpc_request **request)
3391 {
3392         struct obd_device       *obd = exp->exp_obd;
3393         struct lmv_obd          *lmv = &obd->u.lmv;
3394         struct lmv_tgt_desc     *tgt;
3395         int                      rc;
3396         ENTRY;
3397
3398         rc = lmv_check_connect(obd);
3399         if (rc)
3400                 RETURN(rc);
3401
3402         tgt = lmv_find_target(lmv, fid);
3403         if (IS_ERR(tgt))
3404                 RETURN(PTR_ERR(tgt));
3405
3406         rc = md_get_remote_perm(tgt->ltd_exp, fid, oc, suppgid, request);
3407         RETURN(rc);
3408 }
3409
3410 static int lmv_renew_capa(struct obd_export *exp, struct obd_capa *oc,
3411                           renew_capa_cb_t cb)
3412 {
3413         struct obd_device       *obd = exp->exp_obd;
3414         struct lmv_obd          *lmv = &obd->u.lmv;
3415         struct lmv_tgt_desc     *tgt;
3416         int                      rc;
3417         ENTRY;
3418
3419         rc = lmv_check_connect(obd);
3420         if (rc)
3421                 RETURN(rc);
3422
3423         tgt = lmv_find_target(lmv, &oc->c_capa.lc_fid);
3424         if (IS_ERR(tgt))
3425                 RETURN(PTR_ERR(tgt));
3426
3427         rc = md_renew_capa(tgt->ltd_exp, oc, cb);
3428         RETURN(rc);
3429 }
3430
3431 int lmv_unpack_capa(struct obd_export *exp, struct ptlrpc_request *req,
3432                     const struct req_msg_field *field, struct obd_capa **oc)
3433 {
3434         struct lmv_obd          *lmv = &exp->exp_obd->u.lmv;
3435         struct lmv_tgt_desc     *tgt = lmv->tgts[0];
3436
3437         if (tgt == NULL || tgt->ltd_exp == NULL)
3438                 RETURN(-EINVAL);
3439         return md_unpack_capa(tgt->ltd_exp, req, field, oc);
3440 }
3441
3442 int lmv_intent_getattr_async(struct obd_export *exp,
3443                              struct md_enqueue_info *minfo,
3444                              struct ldlm_enqueue_info *einfo)
3445 {
3446         struct md_op_data       *op_data = &minfo->mi_data;
3447         struct obd_device       *obd = exp->exp_obd;
3448         struct lmv_obd          *lmv = &obd->u.lmv;
3449         struct lmv_tgt_desc     *tgt = NULL;
3450         int                      rc;
3451         ENTRY;
3452
3453         rc = lmv_check_connect(obd);
3454         if (rc)
3455                 RETURN(rc);
3456
3457         tgt = lmv_locate_mds(lmv, op_data, &op_data->op_fid1);
3458         if (IS_ERR(tgt))
3459                 RETURN(PTR_ERR(tgt));
3460
3461         rc = md_intent_getattr_async(tgt->ltd_exp, minfo, einfo);
3462         RETURN(rc);
3463 }
3464
3465 int lmv_revalidate_lock(struct obd_export *exp, struct lookup_intent *it,
3466                         struct lu_fid *fid, __u64 *bits)
3467 {
3468         struct obd_device       *obd = exp->exp_obd;
3469         struct lmv_obd          *lmv = &obd->u.lmv;
3470         struct lmv_tgt_desc     *tgt;
3471         int                      rc;
3472         ENTRY;
3473
3474         rc = lmv_check_connect(obd);
3475         if (rc)
3476                 RETURN(rc);
3477
3478         tgt = lmv_find_target(lmv, fid);
3479         if (IS_ERR(tgt))
3480                 RETURN(PTR_ERR(tgt));
3481
3482         rc = md_revalidate_lock(tgt->ltd_exp, it, fid, bits);
3483         RETURN(rc);
3484 }
3485
3486 int lmv_get_fid_from_lsm(struct obd_export *exp,
3487                          const struct lmv_stripe_md *lsm,
3488                          const char *name, int namelen, struct lu_fid *fid)
3489 {
3490         const struct lmv_oinfo *oinfo;
3491
3492         LASSERT(lsm != NULL);
3493         oinfo = lsm_name_to_stripe_info(lsm, name, namelen);
3494         if (IS_ERR(oinfo))
3495                 return PTR_ERR(oinfo);
3496
3497         *fid = oinfo->lmo_fid;
3498
3499         RETURN(0);
3500 }
3501
3502 /**
3503  * For lmv, only need to send request to master MDT, and the master MDT will
3504  * process with other slave MDTs. The only exception is Q_GETOQUOTA for which
3505  * we directly fetch data from the slave MDTs.
3506  */
3507 int lmv_quotactl(struct obd_device *unused, struct obd_export *exp,
3508                  struct obd_quotactl *oqctl)
3509 {
3510         struct obd_device   *obd = class_exp2obd(exp);
3511         struct lmv_obd      *lmv = &obd->u.lmv;
3512         struct lmv_tgt_desc *tgt = lmv->tgts[0];
3513         int                  rc = 0;
3514         __u32                i;
3515         __u64                curspace, curinodes;
3516         ENTRY;
3517
3518         if (tgt == NULL ||
3519             tgt->ltd_exp == NULL ||
3520             !tgt->ltd_active ||
3521             lmv->desc.ld_tgt_count == 0) {
3522                 CERROR("master lmv inactive\n");
3523                 RETURN(-EIO);
3524         }
3525
3526         if (oqctl->qc_cmd != Q_GETOQUOTA) {
3527                 rc = obd_quotactl(tgt->ltd_exp, oqctl);
3528                 RETURN(rc);
3529         }
3530
3531         curspace = curinodes = 0;
3532         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3533                 int err;
3534                 tgt = lmv->tgts[i];
3535
3536                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active)
3537                         continue;
3538
3539                 err = obd_quotactl(tgt->ltd_exp, oqctl);
3540                 if (err) {
3541                         CERROR("getquota on mdt %d failed. %d\n", i, err);
3542                         if (!rc)
3543                                 rc = err;
3544                 } else {
3545                         curspace += oqctl->qc_dqblk.dqb_curspace;
3546                         curinodes += oqctl->qc_dqblk.dqb_curinodes;
3547                 }
3548         }
3549         oqctl->qc_dqblk.dqb_curspace = curspace;
3550         oqctl->qc_dqblk.dqb_curinodes = curinodes;
3551
3552         RETURN(rc);
3553 }
3554
3555 int lmv_quotacheck(struct obd_device *unused, struct obd_export *exp,
3556                    struct obd_quotactl *oqctl)
3557 {
3558         struct obd_device       *obd = class_exp2obd(exp);
3559         struct lmv_obd          *lmv = &obd->u.lmv;
3560         struct lmv_tgt_desc     *tgt;
3561         __u32                    i;
3562         int                      rc = 0;
3563         ENTRY;
3564
3565         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
3566                 int err;
3567                 tgt = lmv->tgts[i];
3568                 if (tgt == NULL || tgt->ltd_exp == NULL || !tgt->ltd_active) {
3569                         CERROR("lmv idx %d inactive\n", i);
3570                         RETURN(-EIO);
3571                 }
3572
3573                 err = obd_quotacheck(tgt->ltd_exp, oqctl);
3574                 if (err && !rc)
3575                         rc = err;
3576         }
3577
3578         RETURN(rc);
3579 }
3580
3581 int lmv_update_lsm_md(struct obd_export *exp, struct lmv_stripe_md *lsm,
3582                       struct mdt_body *body, ldlm_blocking_callback cb_blocking)
3583 {
3584         return lmv_revalidate_slaves(exp, body, lsm, cb_blocking, 0);
3585 }
3586
3587 int lmv_merge_attr(struct obd_export *exp, const struct lmv_stripe_md *lsm,
3588                    struct cl_attr *attr)
3589 {
3590         int i;
3591
3592         for (i = 0; i < lsm->lsm_md_stripe_count; i++) {
3593                 struct inode *inode = lsm->lsm_md_oinfo[i].lmo_root;
3594
3595                 CDEBUG(D_INFO, ""DFID" size %llu, nlink %u, atime %lu ctime"
3596                        "%lu, mtime %lu.\n", PFID(&lsm->lsm_md_oinfo[i].lmo_fid),
3597                        i_size_read(inode), inode->i_nlink,
3598                        LTIME_S(inode->i_atime), LTIME_S(inode->i_ctime),
3599                        LTIME_S(inode->i_mtime));
3600
3601                 /* for slave stripe, it needs to subtract nlink for . and .. */
3602                 if (i != 0)
3603                         attr->cat_nlink += inode->i_nlink - 2;
3604                 else
3605                         attr->cat_nlink = inode->i_nlink;
3606
3607                 attr->cat_size += i_size_read(inode);
3608
3609                 if (attr->cat_atime < LTIME_S(inode->i_atime))
3610                         attr->cat_atime = LTIME_S(inode->i_atime);
3611
3612                 if (attr->cat_ctime < LTIME_S(inode->i_ctime))
3613                         attr->cat_ctime = LTIME_S(inode->i_ctime);
3614
3615                 if (attr->cat_mtime < LTIME_S(inode->i_mtime))
3616                         attr->cat_mtime = LTIME_S(inode->i_mtime);
3617         }
3618         return 0;
3619 }
3620
3621 struct obd_ops lmv_obd_ops = {
3622         .o_owner                = THIS_MODULE,
3623         .o_setup                = lmv_setup,
3624         .o_cleanup              = lmv_cleanup,
3625         .o_precleanup           = lmv_precleanup,
3626         .o_process_config       = lmv_process_config,
3627         .o_connect              = lmv_connect,
3628         .o_disconnect           = lmv_disconnect,
3629         .o_statfs               = lmv_statfs,
3630         .o_get_info             = lmv_get_info,
3631         .o_set_info_async       = lmv_set_info_async,
3632         .o_packmd               = lmv_packmd,
3633         .o_unpackmd             = lmv_unpackmd,
3634         .o_notify               = lmv_notify,
3635         .o_get_uuid             = lmv_get_uuid,
3636         .o_iocontrol            = lmv_iocontrol,
3637         .o_quotacheck           = lmv_quotacheck,
3638         .o_quotactl             = lmv_quotactl
3639 };
3640
3641 struct md_ops lmv_md_ops = {
3642         .m_getstatus            = lmv_getstatus,
3643         .m_null_inode           = lmv_null_inode,
3644         .m_find_cbdata          = lmv_find_cbdata,
3645         .m_close                = lmv_close,
3646         .m_create               = lmv_create,
3647         .m_done_writing         = lmv_done_writing,
3648         .m_enqueue              = lmv_enqueue,
3649         .m_getattr              = lmv_getattr,
3650         .m_getxattr             = lmv_getxattr,
3651         .m_getattr_name         = lmv_getattr_name,
3652         .m_intent_lock          = lmv_intent_lock,
3653         .m_link                 = lmv_link,
3654         .m_rename               = lmv_rename,
3655         .m_setattr              = lmv_setattr,
3656         .m_setxattr             = lmv_setxattr,
3657         .m_fsync                = lmv_fsync,
3658         .m_read_page            = lmv_read_page,
3659         .m_unlink               = lmv_unlink,
3660         .m_init_ea_size         = lmv_init_ea_size,
3661         .m_cancel_unused        = lmv_cancel_unused,
3662         .m_set_lock_data        = lmv_set_lock_data,
3663         .m_lock_match           = lmv_lock_match,
3664         .m_get_lustre_md        = lmv_get_lustre_md,
3665         .m_free_lustre_md       = lmv_free_lustre_md,
3666         .m_update_lsm_md        = lmv_update_lsm_md,
3667         .m_merge_attr           = lmv_merge_attr,
3668         .m_set_open_replay_data = lmv_set_open_replay_data,
3669         .m_clear_open_replay_data = lmv_clear_open_replay_data,
3670         .m_renew_capa           = lmv_renew_capa,
3671         .m_unpack_capa          = lmv_unpack_capa,
3672         .m_get_remote_perm      = lmv_get_remote_perm,
3673         .m_intent_getattr_async = lmv_intent_getattr_async,
3674         .m_revalidate_lock      = lmv_revalidate_lock,
3675         .m_get_fid_from_lsm     = lmv_get_fid_from_lsm,
3676 };
3677
3678 int __init lmv_init(void)
3679 {
3680         return class_register_type(&lmv_obd_ops, &lmv_md_ops, true, NULL,
3681 #ifndef HAVE_ONLY_PROCFS_SEQ
3682                                    NULL,
3683 #endif
3684                                    LUSTRE_LMV_NAME, NULL);
3685 }
3686
3687 static void lmv_exit(void)
3688 {
3689         class_unregister_type(LUSTRE_LMV_NAME);
3690 }
3691
3692 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
3693 MODULE_DESCRIPTION("Lustre Logical Metadata Volume OBD driver");
3694 MODULE_LICENSE("GPL");
3695
3696 module_init(lmv_init);
3697 module_exit(lmv_exit);