lustre/lmv/lmv_obd.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Copyright (C) 2002, 2003 Cluster File Systems, Inc.
   5  *
   6  *   This file is part of Lustre, http://www.lustre.org.
   7  *
   8  *   Lustre is free software; you can redistribute it and/or
   9  *   modify it under the terms of version 2 of the GNU General Public
  10  *   License as published by the Free Software Foundation.
  11  *
  12  *   Lustre is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with Lustre; if not, write to the Free Software
  19  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #ifndef EXPORT_SYMTAB
  23 # define EXPORT_SYMTAB
  24 #endif
  25 #define DEBUG_SUBSYSTEM S_LMV
  26 #ifdef __KERNEL__
  27 #include <linux/slab.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/slab.h>
  31 #include <linux/pagemap.h>
  32 #include <asm/div64.h>
  33 #include <linux/seq_file.h>
  34 #else
  35 #include <liblustre.h>
  36 #endif
  37 #include <linux/ext2_fs.h>
  38
  39 #include <linux/obd_support.h>
  40 #include <linux/lustre_lib.h>
  41 #include <linux/lustre_net.h>
  42 #include <linux/lustre_idl.h>
  43 #include <linux/lustre_dlm.h>
  44 #include <linux/lustre_mds.h>
  45 #include <linux/obd_class.h>
  46 #include <linux/obd_ost.h>
  47 #include <linux/lprocfs_status.h>
  48 #include <linux/lustre_fsfilt.h>
  49 #include <linux/obd_lmv.h>
  50 #include "lmv_internal.h"
  51
  52 /* object cache. */
  53 kmem_cache_t *obj_cache;
  54 atomic_t obj_cache_count = ATOMIC_INIT(0);
  55
  56 static void lmv_activate_target(struct lmv_obd *lmv,
  57                                 struct lmv_tgt_desc *tgt,
  58                                 int activate)
  59 {
  60         if (tgt->active == activate)
  61                 return;
  62
  63         tgt->active = activate;
  64         lmv->desc.ld_active_tgt_count += (activate ? 1 : -1);
  65 }
  66
  67 /* Error codes:
  68  *
  69  *  -EINVAL  : UUID can't be found in the LMV's target list
  70  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
  71  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
  72  */
  73 static int lmv_set_mdc_active(struct lmv_obd *lmv, struct obd_uuid *uuid,
  74                               int activate)
  75 {
  76         struct lmv_tgt_desc *tgt;
  77         struct obd_device *obd;
  78         int i, rc = 0;
  79         ENTRY;
  80
  81         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
  82                lmv, uuid->uuid, activate);
  83
  84         spin_lock(&lmv->lmv_lock);
  85         for (i = 0, tgt = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgt++) {
  86                 if (tgt->ltd_exp == NULL)
  87                         continue;
  88
  89                 CDEBUG(D_INFO, "lmv idx %d is %s conn "LPX64"\n",
  90                        i, tgt->uuid.uuid, tgt->ltd_exp->exp_handle.h_cookie);
  91
  92                 if (strncmp(uuid->uuid, tgt->uuid.uuid, sizeof uuid->uuid) == 0)
  93                         break;
  94         }
  95
  96         if (i == lmv->desc.ld_tgt_count)
  97                 GOTO(out_lmv_lock, rc = -EINVAL);
  98
  99         obd = class_exp2obd(tgt->ltd_exp);
 100         if (obd == NULL)
 101                 GOTO(out_lmv_lock, rc = -ENOTCONN);
 102
 103         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
 104                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
 105                obd->obd_type->typ_name, i);
 106         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0);
 107
 108         if (tgt->active == activate) {
 109                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
 110                        activate ? "" : "in");
 111                 GOTO(out_lmv_lock, rc);
 112         }
 113
 114         CDEBUG(D_INFO, "Marking OBD %p %sactive\n",
 115                obd, activate ? "" : "in");
 116
 117         lmv_activate_target(lmv, tgt, activate);
 118
 119         EXIT;
 120
 121  out_lmv_lock:
 122         spin_unlock(&lmv->lmv_lock);
 123         return rc;
 124 }
 125
 126 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
 127                       int active, void *data)
 128 {
 129         struct obd_uuid *uuid;
 130         int rc;
 131         ENTRY;
 132
 133         if (strcmp(watched->obd_type->typ_name, LUSTRE_MDC_NAME)) {
 134                 CERROR("unexpected notification of %s %s!\n",
 135                        watched->obd_type->typ_name,
 136                        watched->obd_name);
 137                 RETURN(-EINVAL);
 138         }
 139         uuid = &watched->u.cli.cl_import->imp_target_uuid;
 140
 141         /* Set MDC as active before notifying the observer, so the observer can
 142          * use the MDC normally.
 143          */
 144         rc = lmv_set_mdc_active(&obd->u.lmv, uuid, active);
 145         if (rc) {
 146                 CERROR("%sactivation of %s failed: %d\n",
 147                        active ? "" : "de", uuid->uuid, rc);
 148                 RETURN(rc);
 149         }
 150
 151         if (obd->obd_observer)
 152                 /* Pass the notification up the chain. */
 153                 rc = obd_notify(obd->obd_observer, watched, active, data);
 154
 155         RETURN(rc);
 156 }
 157
 158 int lmv_attach(struct obd_device *dev, obd_count len, void *data)
 159 {
 160         struct lprocfs_static_vars lvars;
 161         int rc;
 162         ENTRY;
 163
 164         lprocfs_init_vars(lmv, &lvars);
 165         rc = lprocfs_obd_attach(dev, lvars.obd_vars);
 166 #ifdef __KERNEL__
 167         if (rc == 0) {
 168                 struct proc_dir_entry *entry;
 169
 170                 entry = create_proc_entry("target_obd_status", 0444,
 171                                            dev->obd_proc_entry);
 172                 if (entry == NULL)
 173                         RETURN(-ENOMEM);
 174                 entry->proc_fops = &lmv_proc_target_fops;
 175                 entry->data = dev;
 176        }
 177 #endif
 178         RETURN (rc);
 179 }
 180
 181 int lmv_detach(struct obd_device *dev)
 182 {
 183         return lprocfs_obd_detach(dev);
 184 }
 185
 186 /* this is fake connect function. Its purpose is to initialize lmv and say
 187  * caller that everything is okay. Real connection will be performed later. */
 188 static int lmv_connect(struct lustre_handle *conn, struct obd_device *obd,
 189                        struct obd_uuid *cluuid, unsigned long flags)
 190 {
 191 #ifdef __KERNEL__
 192         struct proc_dir_entry *lmv_proc_dir;
 193 #endif
 194         struct lmv_obd *lmv = &obd->u.lmv;
 195         struct obd_export *exp;
 196         int rc = 0;
 197         ENTRY;
 198
 199         rc = class_connect(conn, obd, cluuid);
 200         if (rc) {
 201                 CERROR("class_connection() returned %d\n", rc);
 202                 RETURN(rc);
 203         }
 204
 205         exp = class_conn2export(conn);
 206
 207         /* we don't want to actually do the underlying connections more than
 208          * once, so keep track. */
 209         lmv->refcount++;
 210         if (lmv->refcount > 1) {
 211                 class_export_put(exp);
 212                 RETURN(0);
 213         }
 214
 215         lmv->exp = exp;
 216         lmv->connected = 0;
 217         lmv->cluuid = *cluuid;
 218         lmv->connect_flags = flags;
 219         sema_init(&lmv->init_sem, 1);
 220
 221 #ifdef __KERNEL__
 222         lmv_proc_dir = lprocfs_register("target_obds", obd->obd_proc_entry,
 223                                         NULL, NULL);
 224         if (IS_ERR(lmv_proc_dir)) {
 225                 CERROR("could not register /proc/fs/lustre/%s/%s/target_obds.",
 226                        obd->obd_type->typ_name, obd->obd_name);
 227                 lmv_proc_dir = NULL;
 228         }
 229 #endif
 230
 231         /*
 232          * all real clients shouls perform actual connection rightaway, because
 233          * it is possible, that LMV will not have opportunity to connect
 234          * targets, as MDC stuff will bit called directly, for instance while
 235          * reading ../mdc/../kbytesfree procfs file, etc.
 236          */
 237         if (flags & OBD_OPT_REAL_CLIENT)
 238                 rc = lmv_check_connect(obd);
 239
 240 #ifdef __KERNEL__
 241         if (rc) {
 242                 if (lmv_proc_dir)
 243                         lprocfs_remove(lmv_proc_dir);
 244         }
 245 #endif
 246
 247         RETURN(rc);
 248 }
 249
 250 void lmv_set_timeouts(struct obd_device *obd)
 251 {
 252         struct lmv_tgt_desc *tgts;
 253         struct lmv_obd *lmv;
 254         int i;
 255
 256         lmv = &obd->u.lmv;
 257         if (lmv->server_timeout == 0)
 258                 return;
 259
 260         if (lmv->connected == 0)
 261                 return;
 262
 263         for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgts++) {
 264                 if (tgts->ltd_exp == NULL)
 265                         continue;
 266
 267                 obd_set_info(tgts->ltd_exp, strlen("inter_mds"),
 268                              "inter_mds", 0, NULL);
 269         }
 270 }
 271
 272 #define MAX_STRING_SIZE 128
 273
 274 /* performs a check if passed obd is connected. If no - connect it. */
 275 int lmv_check_connect(struct obd_device *obd)
 276 {
 277 #ifdef __KERNEL__
 278         struct proc_dir_entry *lmv_proc_dir;
 279 #endif
 280         struct lmv_obd *lmv = &obd->u.lmv;
 281         struct lmv_tgt_desc *tgts;
 282         struct obd_uuid *cluuid;
 283         struct obd_export *exp;
 284         int rc, rc2, i;
 285         ENTRY;
 286
 287         if (lmv->connected)
 288                 RETURN(0);
 289
 290         down(&lmv->init_sem);
 291         if (lmv->connected) {
 292                 up(&lmv->init_sem);
 293                 RETURN(0);
 294         }
 295
 296         cluuid = &lmv->cluuid;
 297         exp = lmv->exp;
 298
 299         CDEBUG(D_OTHER, "time to connect %s to %s\n",
 300                cluuid->uuid, obd->obd_name);
 301
 302         for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgts++) {
 303                 struct obd_uuid lmv_mdc_uuid = { "LMV_MDC_UUID" };
 304                 struct lustre_handle conn = {0, };
 305                 struct obd_device *tgt_obd;
 306
 307                 LASSERT(tgts != NULL);
 308
 309                 tgt_obd = class_find_client_obd(&tgts->uuid, LUSTRE_MDC_NAME,
 310                                                 &obd->obd_uuid);
 311                 if (!tgt_obd) {
 312                         CERROR("target %s not attached\n", tgts->uuid.uuid);
 313                         GOTO(out_disc, rc = -EINVAL);
 314                 }
 315
 316                 /* for MDS: don't connect to yourself */
 317                 if (obd_uuid_equals(&tgts->uuid, cluuid)) {
 318                         CDEBUG(D_OTHER, "don't connect back to %s\n",
 319                                cluuid->uuid);
 320                         tgts->ltd_exp = NULL;
 321                         continue;
 322                 }
 323
 324                 CDEBUG(D_OTHER, "connect to %s(%s) - %s, %s FOR %s\n",
 325                         tgt_obd->obd_name, tgt_obd->obd_uuid.uuid,
 326                         tgts->uuid.uuid, obd->obd_uuid.uuid,
 327                         cluuid->uuid);
 328
 329                 if (!tgt_obd->obd_set_up) {
 330                         CERROR("target %s not set up\n", tgts->uuid.uuid);
 331                         GOTO(out_disc, rc = -EINVAL);
 332                 }
 333
 334                 rc = obd_connect(&conn, tgt_obd, &lmv_mdc_uuid,
 335                                  lmv->connect_flags);
 336                 if (rc) {
 337                         CERROR("target %s connect error %d\n",
 338                                 tgts->uuid.uuid, rc);
 339                         GOTO(out_disc, rc);
 340                 }
 341                 tgts->ltd_exp = class_conn2export(&conn);
 342
 343                 obd_init_ea_size(tgts->ltd_exp, lmv->max_easize,
 344                                  lmv->max_cookiesize);
 345
 346                 rc = obd_register_observer(tgt_obd, obd);
 347                 if (rc) {
 348                         CERROR("target %s register_observer error %d\n",
 349                                tgts->uuid.uuid, rc);
 350                         obd_disconnect(tgts->ltd_exp, 0);
 351                         GOTO(out_disc, rc);
 352                 }
 353
 354                 lmv->desc.ld_active_tgt_count++;
 355                 tgts->active = 1;
 356
 357                 CDEBUG(D_OTHER, "connected to %s(%s) successfully (%d)\n",
 358                         tgt_obd->obd_name, tgt_obd->obd_uuid.uuid,
 359                         atomic_read(&obd->obd_refcount));
 360
 361 #ifdef __KERNEL__
 362                 lmv_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 363                 if (lmv_proc_dir) {
 364                         struct obd_device *mdc_obd = class_conn2obd(&conn);
 365                         struct proc_dir_entry *mdc_symlink;
 366                         char name[MAX_STRING_SIZE + 1];
 367
 368                         LASSERT(mdc_obd != NULL);
 369                         LASSERT(mdc_obd->obd_type != NULL);
 370                         LASSERT(mdc_obd->obd_type->typ_name != NULL);
 371                         name[MAX_STRING_SIZE] = '\0';
 372                         snprintf(name, MAX_STRING_SIZE, "../../../%s/%s",
 373                                  mdc_obd->obd_type->typ_name,
 374                                  mdc_obd->obd_name);
 375                         mdc_symlink = proc_symlink(mdc_obd->obd_name,
 376                                                    lmv_proc_dir, name);
 377                         if (mdc_symlink == NULL) {
 378                                 CERROR("could not register LMV target "
 379                                        "/proc/fs/lustre/%s/%s/target_obds/%s.",
 380                                        obd->obd_type->typ_name, obd->obd_name,
 381                                        mdc_obd->obd_name);
 382                                 lprocfs_remove(lmv_proc_dir);
 383                                 lmv_proc_dir = NULL;
 384                         }
 385                 }
 386 #endif
 387         }
 388
 389         lmv_set_timeouts(obd);
 390         class_export_put(exp);
 391         lmv->connected = 1;
 392         up(&lmv->init_sem);
 393         RETURN(0);
 394
 395  out_disc:
 396         while (i-- > 0) {
 397                 struct obd_uuid uuid;
 398                 --tgts;
 399                 --lmv->desc.ld_active_tgt_count;
 400                 tgts->active = 0;
 401                 /* save for CERROR below; (we know it's terminated) */
 402                 uuid = tgts->uuid;
 403                 rc2 = obd_disconnect(tgts->ltd_exp, 0);
 404                 if (rc2)
 405                         CERROR("error: LMV target %s disconnect on MDC idx %d: "
 406                                "error %d\n", uuid.uuid, i, rc2);
 407         }
 408         class_disconnect(exp, 0);
 409         up(&lmv->init_sem);
 410         return rc;
 411 }
 412
 413 static int lmv_disconnect(struct obd_export *exp, unsigned long flags)
 414 {
 415         struct obd_device *obd = class_exp2obd(exp);
 416         struct lmv_obd *lmv = &obd->u.lmv;
 417
 418 #ifdef __KERNEL__
 419         struct proc_dir_entry *lmv_proc_dir;
 420 #endif
 421         int rc, i;
 422         ENTRY;
 423
 424         if (!lmv->tgts)
 425                 goto out_local;
 426
 427         /* Only disconnect the underlying layers on the final disconnect. */
 428         lmv->refcount--;
 429         if (lmv->refcount != 0)
 430                 goto out_local;
 431
 432 #ifdef __KERNEL__
 433         lmv_proc_dir = lprocfs_srch(obd->obd_proc_entry, "target_obds");
 434 #endif
 435
 436         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 437                 struct obd_device *mdc_obd;
 438
 439                 if (lmv->tgts[i].ltd_exp == NULL)
 440                         continue;
 441
 442                 mdc_obd = class_exp2obd(lmv->tgts[i].ltd_exp);
 443
 444                 if (mdc_obd)
 445                         mdc_obd->obd_no_recov = obd->obd_no_recov;
 446
 447 #ifdef __KERNEL__
 448                 if (lmv_proc_dir) {
 449                         struct proc_dir_entry *mdc_symlink;
 450
 451                         mdc_symlink = lprocfs_srch(lmv_proc_dir, mdc_obd->obd_name);
 452                         if (mdc_symlink) {
 453                                 lprocfs_remove(mdc_symlink);
 454                         } else {
 455                                 CERROR("/proc/fs/lustre/%s/%s/target_obds/%s missing\n",
 456                                        obd->obd_type->typ_name, obd->obd_name,
 457                                        mdc_obd->obd_name);
 458                         }
 459                 }
 460 #endif
 461                 CDEBUG(D_OTHER, "disconnected from %s(%s) successfully\n",
 462                         lmv->tgts[i].ltd_exp->exp_obd->obd_name,
 463                         lmv->tgts[i].ltd_exp->exp_obd->obd_uuid.uuid);
 464
 465                 obd_register_observer(lmv->tgts[i].ltd_exp->exp_obd, NULL);
 466                 rc = obd_disconnect(lmv->tgts[i].ltd_exp, flags);
 467                 if (rc) {
 468                         if (lmv->tgts[i].active) {
 469                                 CERROR("Target %s disconnect error %d\n",
 470                                        lmv->tgts[i].uuid.uuid, rc);
 471                         }
 472                         rc = 0;
 473                 }
 474
 475                 lmv_activate_target(lmv, &lmv->tgts[i], 0);
 476                 lmv->tgts[i].ltd_exp = NULL;
 477         }
 478
 479 #ifdef __KERNEL__
 480         if (lmv_proc_dir) {
 481                 lprocfs_remove(lmv_proc_dir);
 482         } else {
 483                 CERROR("/proc/fs/lustre/%s/%s/target_obds missing\n",
 484                        obd->obd_type->typ_name, obd->obd_name);
 485         }
 486 #endif
 487
 488 out_local:
 489         /* this is the case when no real connection is established by
 490          * lmv_check_connect(). */
 491         if (!lmv->connected)
 492                 class_export_put(exp);
 493         rc = class_disconnect(exp, 0);
 494         if (lmv->refcount == 0)
 495                 lmv->connected = 0;
 496         RETURN(rc);
 497 }
 498
 499 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
 500                          int len, void *karg, void *uarg)
 501 {
 502         struct obd_device *obddev = class_exp2obd(exp);
 503         struct lmv_obd *lmv = &obddev->u.lmv;
 504         int i, rc = 0, set = 0;
 505         ENTRY;
 506
 507         if (lmv->desc.ld_tgt_count == 0)
 508                 RETURN(-ENOTTY);
 509
 510         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 511                 int err;
 512
 513                 if (lmv->tgts[i].ltd_exp == NULL)
 514                         continue;
 515
 516                 err = obd_iocontrol(cmd, lmv->tgts[i].ltd_exp, len, karg, uarg);
 517                 if (err) {
 518                         if (lmv->tgts[i].active) {
 519                                 CERROR("error: iocontrol MDC %s on MDT"
 520                                        "idx %d: err = %d\n",
 521                                        lmv->tgts[i].uuid.uuid, i, err);
 522                                 if (!rc)
 523                                         rc = err;
 524                         }
 525                 } else
 526                         set = 1;
 527         }
 528         if (!set && !rc)
 529                 rc = -EIO;
 530
 531         RETURN(rc);
 532 }
 533
 534 static int lmv_setup(struct obd_device *obd, obd_count len, void *buf)
 535 {
 536         int i, rc = 0;
 537         struct lmv_desc *desc;
 538         struct obd_uuid *uuids;
 539         struct lmv_tgt_desc *tgts;
 540         struct obd_device *tgt_obd;
 541         struct lustre_cfg *lcfg = buf;
 542         struct lmv_obd *lmv = &obd->u.lmv;
 543         ENTRY;
 544
 545         if (lcfg->lcfg_inllen1 < 1) {
 546                 CERROR("LMV setup requires a descriptor\n");
 547                 RETURN(-EINVAL);
 548         }
 549
 550         if (lcfg->lcfg_inllen2 < 1) {
 551                 CERROR("LMV setup requires an MDT UUID list\n");
 552                 RETURN(-EINVAL);
 553         }
 554
 555         desc = (struct lmv_desc *)lcfg->lcfg_inlbuf1;
 556         if (sizeof(*desc) > lcfg->lcfg_inllen1) {
 557                 CERROR("descriptor size wrong: %d > %d\n",
 558                        (int)sizeof(*desc), lcfg->lcfg_inllen1);
 559                 RETURN(-EINVAL);
 560         }
 561
 562         uuids = (struct obd_uuid *)lcfg->lcfg_inlbuf2;
 563         if (sizeof(*uuids) * desc->ld_tgt_count != lcfg->lcfg_inllen2) {
 564                 CERROR("UUID array size wrong: %u * %u != %u\n",
 565                        sizeof(*uuids), desc->ld_tgt_count, lcfg->lcfg_inllen2);
 566                 RETURN(-EINVAL);
 567         }
 568
 569         lmv->tgts_size = sizeof(struct lmv_tgt_desc) * desc->ld_tgt_count;
 570         OBD_ALLOC(lmv->tgts, lmv->tgts_size);
 571         if (lmv->tgts == NULL) {
 572                 CERROR("Out of memory\n");
 573                 RETURN(-ENOMEM);
 574         }
 575
 576         lmv->desc = *desc;
 577         spin_lock_init(&lmv->lmv_lock);
 578
 579         for (i = 0, tgts = lmv->tgts; i < desc->ld_tgt_count; i++, tgts++)
 580                 tgts->uuid = uuids[i];
 581
 582         lmv->max_cookiesize = 0;
 583
 584         lmv->max_easize = sizeof(struct lustre_id) *
 585                 desc->ld_tgt_count + sizeof(struct mea);
 586
 587         rc = lmv_setup_mgr(obd);
 588         if (rc) {
 589                 CERROR("Can't setup LMV object manager, "
 590                        "error %d.\n", rc);
 591                 OBD_FREE(lmv->tgts, lmv->tgts_size);
 592         }
 593
 594         tgt_obd = class_find_client_obd(&lmv->tgts->uuid, LUSTRE_MDC_NAME,
 595                                         &obd->obd_uuid);
 596         if (!tgt_obd) {
 597                 CERROR("Target %s not attached\n", lmv->tgts->uuid.uuid);
 598                 RETURN(-EINVAL);
 599         }
 600
 601         RETURN(rc);
 602 }
 603
 604 static int lmv_cleanup(struct obd_device *obd, int flags)
 605 {
 606         struct lmv_obd *lmv = &obd->u.lmv;
 607         ENTRY;
 608
 609         lmv_cleanup_mgr(obd);
 610         OBD_FREE(lmv->tgts, lmv->tgts_size);
 611
 612         RETURN(0);
 613 }
 614
 615 static int lmv_statfs(struct obd_device *obd, struct obd_statfs *osfs,
 616                       unsigned long max_age)
 617 {
 618         struct lmv_obd *lmv = &obd->u.lmv;
 619         struct obd_statfs *temp;
 620         int rc = 0, i;
 621         ENTRY;
 622
 623         rc = lmv_check_connect(obd);
 624         if (rc)
 625                 RETURN(rc);
 626
 627         OBD_ALLOC(temp, sizeof(*temp));
 628         if (temp == NULL)
 629                 RETURN(-ENOMEM);
 630
 631         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 632                 if (lmv->tgts[i].ltd_exp == NULL) {
 633                         CWARN("%s: NULL export for %d\n", obd->obd_name, i);
 634                         continue;
 635                 }
 636
 637                 rc = obd_statfs(lmv->tgts[i].ltd_exp->exp_obd, temp, max_age);
 638                 if (rc) {
 639                         CERROR("can't stat MDS #%d (%s), error %d\n", i,
 640                                lmv->tgts[i].ltd_exp->exp_obd->obd_name,
 641                                rc);
 642                         GOTO(out_free_temp, rc);
 643                 }
 644                 if (i == 0) {
 645                         memcpy(osfs, temp, sizeof(*temp));
 646                 } else {
 647                         osfs->os_bavail += temp->os_bavail;
 648                         osfs->os_blocks += temp->os_blocks;
 649                         osfs->os_ffree += temp->os_ffree;
 650                         osfs->os_files += temp->os_files;
 651                 }
 652         }
 653
 654         EXIT;
 655 out_free_temp:
 656         OBD_FREE(temp, sizeof(*temp));
 657         return rc;
 658 }
 659
 660 static int lmv_getstatus(struct obd_export *exp, struct lustre_id *id)
 661 {
 662         struct obd_device *obd = exp->exp_obd;
 663         struct lmv_obd *lmv = &obd->u.lmv;
 664         int rc;
 665         ENTRY;
 666
 667         rc = lmv_check_connect(obd);
 668         if (rc)
 669                 RETURN(rc);
 670
 671         rc = md_getstatus(lmv->tgts[0].ltd_exp, id);
 672         id_group(id) = 0;
 673
 674         RETURN(rc);
 675 }
 676
 677 static int lmv_getattr(struct obd_export *exp, struct lustre_id *id,
 678                        __u64 valid, unsigned int ea_size,
 679                        struct ptlrpc_request **request)
 680 {
 681         struct obd_device *obd = exp->exp_obd;
 682         struct lmv_obd *lmv = &obd->u.lmv;
 683         int rc, i = id_group(id);
 684         struct lmv_obj *obj;
 685         ENTRY;
 686
 687         rc = lmv_check_connect(obd);
 688         if (rc)
 689                 RETURN(rc);
 690
 691         LASSERT(i < lmv->desc.ld_tgt_count);
 692
 693         rc = md_getattr(lmv->tgts[i].ltd_exp, id, valid,
 694                         ea_size, request);
 695         if (rc)
 696                 RETURN(rc);
 697
 698         obj = lmv_grab_obj(obd, id);
 699
 700         CDEBUG(D_OTHER, "GETATTR for "DLID4" %s\n",
 701                OLID4(id), obj ? "(splitted)" : "");
 702
 703         /*
 704          * if object is splitted, then we loop over all the slaves and gather
 705          * size attribute. In ideal world we would have to gather also mds field
 706          * from all slaves, as object is spread over the cluster and this is
 707          * definitely interesting information and it is not good to loss it,
 708          * but...
 709          */
 710         if (obj) {
 711                 struct mds_body *body;
 712
 713                 if (*request == NULL) {
 714                         lmv_put_obj(obj);
 715                         RETURN(rc);
 716                 }
 717
 718                 body = lustre_msg_buf((*request)->rq_repmsg, 0,
 719                                       sizeof(*body));
 720                 LASSERT(body != NULL);
 721
 722                 lmv_lock_obj(obj);
 723
 724                 for (i = 0; i < obj->objcount; i++) {
 725
 726                         if (lmv->tgts[i].ltd_exp == NULL) {
 727                                 CWARN("%s: NULL export for %d\n",
 728                                       obd->obd_name, i);
 729                                 continue;
 730                         }
 731
 732                         /* skip master obj. */
 733                         if (id_equal_fid(&obj->id, &obj->objs[i].id))
 734                                 continue;
 735
 736                         body->size += obj->objs[i].size;
 737                 }
 738
 739                 lmv_unlock_obj(obj);
 740                 lmv_put_obj(obj);
 741         }
 742
 743         RETURN(rc);
 744 }
 745
 746 static int lmv_change_cbdata(struct obd_export *exp,
 747                              struct lustre_id *id,
 748                              ldlm_iterator_t it,
 749                              void *data)
 750 {
 751         struct obd_device *obd = exp->exp_obd;
 752         struct lmv_obd *lmv = &obd->u.lmv;
 753         int rc = 0;
 754         ENTRY;
 755
 756         rc = lmv_check_connect(obd);
 757         if (rc)
 758                 RETURN(rc);
 759
 760         CDEBUG(D_OTHER, "CBDATA for "DLID4"\n", OLID4(id));
 761         LASSERT(id_group(id) < lmv->desc.ld_tgt_count);
 762
 763         rc = md_change_cbdata(lmv->tgts[id_group(id)].ltd_exp,
 764                               id, it, data);
 765
 766         RETURN(rc);
 767 }
 768
 769 static int lmv_change_cbdata_name(struct obd_export *exp,
 770                                   struct lustre_id *pid,
 771                                   char *name, int len,
 772                                   struct lustre_id *cid,
 773                                   ldlm_iterator_t it,
 774                                   void *data)
 775 {
 776         struct obd_device *obd = exp->exp_obd;
 777         struct lmv_obd *lmv = &obd->u.lmv;
 778         struct lustre_id rcid = *cid;
 779         struct lmv_obj *obj;
 780         int rc = 0, mds;
 781         ENTRY;
 782
 783         rc = lmv_check_connect(obd);
 784         if (rc)
 785                 RETURN(rc);
 786
 787         LASSERT(id_group(pid) < lmv->desc.ld_tgt_count);
 788         LASSERT(id_group(cid) < lmv->desc.ld_tgt_count);
 789
 790         CDEBUG(D_OTHER, "CBDATA for "DLID4":%*s -> "DLID4"\n",
 791                OLID4(pid), len, name, OLID4(cid));
 792
 793         /* this is default mds for directory name belongs to. */
 794         mds = id_group(pid);
 795         obj = lmv_grab_obj(obd, pid);
 796         if (obj) {
 797                 /* directory is splitted. look for right mds for this name. */
 798                 mds = raw_name2idx(obj->hashtype, obj->objcount, name, len);
 799                 rcid = obj->objs[mds].id;
 800                 mds = id_group(&rcid);
 801                 lmv_put_obj(obj);
 802         }
 803         rc = md_change_cbdata(lmv->tgts[mds].ltd_exp, &rcid, it, data);
 804         RETURN(rc);
 805 }
 806
 807 static int lmv_valid_attrs(struct obd_export *exp, struct lustre_id *id)
 808 {
 809         struct obd_device *obd = exp->exp_obd;
 810         struct lmv_obd *lmv = &obd->u.lmv;
 811         int rc = 0;
 812         ENTRY;
 813
 814         rc = lmv_check_connect(obd);
 815         if (rc)
 816                 RETURN(rc);
 817
 818         CDEBUG(D_OTHER, "validate "DLID4"\n", OLID4(id));
 819         LASSERT(id_group(id) < lmv->desc.ld_tgt_count);
 820         rc = md_valid_attrs(lmv->tgts[id_group(id)].ltd_exp, id);
 821         RETURN(rc);
 822 }
 823
 824 int lmv_close(struct obd_export *exp, struct obdo *obdo,
 825               struct obd_client_handle *och,
 826               struct ptlrpc_request **request)
 827 {
 828         struct obd_device *obd = exp->exp_obd;
 829         struct lmv_obd *lmv = &obd->u.lmv;
 830         int rc, i = obdo->o_mds;
 831         ENTRY;
 832
 833         rc = lmv_check_connect(obd);
 834         if (rc)
 835                 RETURN(rc);
 836
 837         LASSERT(i < lmv->desc.ld_tgt_count);
 838         CDEBUG(D_OTHER, "CLOSE %lu/%lu/%lu\n", (unsigned long)obdo->o_mds,
 839                (unsigned long)obdo->o_id, (unsigned long)obdo->o_generation);
 840         rc = md_close(lmv->tgts[i].ltd_exp, obdo, och, request);
 841         RETURN(rc);
 842 }
 843
 844 int lmv_get_mea_and_update_object(struct obd_export *exp,
 845                                   struct lustre_id *id)
 846 {
 847         struct obd_device *obd = exp->exp_obd;
 848         struct lmv_obd *lmv = &obd->u.lmv;
 849         struct ptlrpc_request *req = NULL;
 850         struct lmv_obj *obj;
 851         struct lustre_md md;
 852         int mealen, rc;
 853         __u64 valid;
 854         ENTRY;
 855
 856         md.mea = NULL;
 857         mealen = MEA_SIZE_LMV(lmv);
 858
 859         valid = OBD_MD_FLEASIZE | OBD_MD_FLDIREA;
 860
 861         /* time to update mea of parent id */
 862         rc = md_getattr(lmv->tgts[id_group(id)].ltd_exp,
 863                         id, valid, mealen, &req);
 864         if (rc) {
 865                 CERROR("md_getattr() failed, error %d\n", rc);
 866                 GOTO(cleanup, rc);
 867         }
 868
 869         rc = mdc_req2lustre_md(exp, req, 0, NULL, &md);
 870         if (rc) {
 871                 CERROR("mdc_req2lustre_md() failed, error %d\n", rc);
 872                 GOTO(cleanup, rc);
 873         }
 874
 875         if (md.mea == NULL)
 876                 GOTO(cleanup, rc = -ENODATA);
 877
 878         obj = lmv_create_obj(exp, id, md.mea);
 879         if (IS_ERR(obj))
 880                 rc = PTR_ERR(obj);
 881
 882         lmv_put_obj(obj);
 883         obd_free_memmd(exp, (struct lov_stripe_md **)&md.mea);
 884
 885         EXIT;
 886 cleanup:
 887         if (req)
 888                 ptlrpc_req_finished(req);
 889         return rc;
 890 }
 891
 892 int lmv_create(struct obd_export *exp, struct mdc_op_data *op_data,
 893                const void *data, int datalen, int mode, __u32 uid,
 894                __u32 gid, __u64 rdev, struct ptlrpc_request **request)
 895 {
 896         struct obd_device *obd = exp->exp_obd;
 897         struct lmv_obd *lmv = &obd->u.lmv;
 898         struct mds_body *body;
 899         struct lmv_obj *obj;
 900         int rc, mds, loop = 0;
 901         ENTRY;
 902
 903         rc = lmv_check_connect(obd);
 904         if (rc)
 905                 RETURN(rc);
 906
 907         if (!lmv->desc.ld_active_tgt_count)
 908                 RETURN(-EIO);
 909 repeat:
 910         LASSERT(++loop <= 2);
 911         obj = lmv_grab_obj(obd, &op_data->id1);
 912         if (obj) {
 913                 mds = raw_name2idx(obj->hashtype, obj->objcount,
 914                                    op_data->name, op_data->namelen);
 915                 op_data->id1 = obj->objs[mds].id;
 916                 lmv_put_obj(obj);
 917         }
 918
 919         CDEBUG(D_OTHER, "CREATE '%*s' on "DLID4"\n", op_data->namelen,
 920                op_data->name, OLID4(&op_data->id1));
 921
 922         rc = md_create(lmv->tgts[id_group(&op_data->id1)].ltd_exp,
 923                        op_data, data, datalen, mode, uid, gid, rdev,
 924                        request);
 925         if (rc == 0) {
 926                 if (*request == NULL)
 927                         RETURN(rc);
 928
 929                 body = lustre_msg_buf((*request)->rq_repmsg, 0,
 930                                       sizeof(*body));
 931                 if (body == NULL)
 932                         RETURN(-ENOMEM);
 933
 934                 CDEBUG(D_OTHER, "created. "DLID4"\n", OLID4(&op_data->id1));
 935         } else if (rc == -ERESTART) {
 936                 /*
 937                  * directory got splitted. time to update local object and
 938                  * repeat the request with proper MDS.
 939                  */
 940                 rc = lmv_get_mea_and_update_object(exp, &op_data->id1);
 941                 if (rc == 0) {
 942                         ptlrpc_req_finished(*request);
 943                         goto repeat;
 944                 }
 945         }
 946         RETURN(rc);
 947 }
 948
 949 int lmv_done_writing(struct obd_export *exp, struct obdo *obdo)
 950 {
 951         struct obd_device *obd = exp->exp_obd;
 952         struct lmv_obd *lmv = &obd->u.lmv;
 953         int rc;
 954         ENTRY;
 955
 956         rc = lmv_check_connect(obd);
 957         if (rc)
 958                 RETURN(rc);
 959
 960         /* FIXME: choose right MDC here */
 961         CWARN("this method isn't implemented yet\n");
 962         rc = md_done_writing(lmv->tgts[0].ltd_exp, obdo);
 963         RETURN(rc);
 964 }
 965
 966 int lmv_enqueue_slaves(struct obd_export *exp, int locktype,
 967                        struct lookup_intent *it, int lockmode,
 968                        struct mdc_op_data *data, struct lustre_handle *lockh,
 969                        void *lmm, int lmmsize, ldlm_completion_callback cb_compl,
 970                        ldlm_blocking_callback cb_blocking, void *cb_data)
 971 {
 972         struct obd_device *obd = exp->exp_obd;
 973         struct lmv_obd *lmv = &obd->u.lmv;
 974         struct mea *mea = data->mea1;
 975         struct mdc_op_data *data2;
 976         int i, rc, mds;
 977         ENTRY;
 978
 979         OBD_ALLOC(data2, sizeof(*data2));
 980         if (data2 == NULL)
 981                 RETURN(-ENOMEM);
 982
 983         LASSERT(mea != NULL);
 984         for (i = 0; i < mea->mea_count; i++) {
 985                 memset(data2, 0, sizeof(*data2));
 986                 data2->id1 = mea->mea_ids[i];
 987                 mds = id_group(&data2->id1);
 988
 989                 if (lmv->tgts[mds].ltd_exp == NULL)
 990                         continue;
 991
 992                 rc = md_enqueue(lmv->tgts[mds].ltd_exp, locktype, it,
 993                                 lockmode, data2, lockh + i, lmm, lmmsize,
 994                                 cb_compl, cb_blocking, cb_data);
 995
 996                 CDEBUG(D_OTHER, "take lock on slave "DLID4" -> %d/%d\n",
 997                        OLID4(&mea->mea_ids[i]), rc, it->d.lustre.it_status);
 998                 if (rc)
 999                         GOTO(cleanup, rc);
1000                 if (it->d.lustre.it_data) {
1001                         struct ptlrpc_request *req;
1002                         req = (struct ptlrpc_request *)it->d.lustre.it_data;
1003                         ptlrpc_req_finished(req);
1004                 }
1005
1006                 if (it->d.lustre.it_status)
1007                         GOTO(cleanup, rc = it->d.lustre.it_status);
1008         }
1009
1010         OBD_FREE(data2, sizeof(*data2));
1011         RETURN(0);
1012 cleanup:
1013         OBD_FREE(data2, sizeof(*data2));
1014
1015         /* drop all taken locks */
1016         while (--i >= 0) {
1017                 if (lockh[i].cookie)
1018                         ldlm_lock_decref(lockh + i, lockmode);
1019                 lockh[i].cookie = 0;
1020         }
1021         return rc;
1022 }
1023
1024 int lmv_enqueue(struct obd_export *exp, int lock_type,
1025                 struct lookup_intent *it, int lock_mode,
1026                 struct mdc_op_data *data, struct lustre_handle *lockh,
1027                 void *lmm, int lmmsize, ldlm_completion_callback cb_compl,
1028                 ldlm_blocking_callback cb_blocking, void *cb_data)
1029 {
1030         struct obd_device *obd = exp->exp_obd;
1031         struct lmv_obd *lmv = &obd->u.lmv;
1032         struct lmv_obj *obj;
1033         int rc, mds;
1034         ENTRY;
1035
1036         rc = lmv_check_connect(obd);
1037         if (rc)
1038                 RETURN(rc);
1039
1040         if (data->mea1 && it->it_op == IT_UNLINK) {
1041                 rc = lmv_enqueue_slaves(exp, lock_type, it, lock_mode,
1042                                         data, lockh, lmm, lmmsize,
1043                                         cb_compl, cb_blocking, cb_data);
1044                 RETURN(rc);
1045         }
1046
1047         if (data->namelen) {
1048                 obj = lmv_grab_obj(obd, &data->id1);
1049                 if (obj) {
1050                         /* directory is splitted. look for right mds for this
1051                          * name */
1052                         mds = raw_name2idx(obj->hashtype, obj->objcount,
1053                                            (char *)data->name, data->namelen);
1054                         data->id1 = obj->objs[mds].id;
1055                         lmv_put_obj(obj);
1056                 }
1057         }
1058         CDEBUG(D_OTHER, "ENQUEUE '%s' on "DLID4"\n", LL_IT2STR(it),
1059                OLID4(&data->id1));
1060
1061         rc = md_enqueue(lmv->tgts[id_group(&data->id1)].ltd_exp,
1062                         lock_type, it, lock_mode, data, lockh, lmm,
1063                         lmmsize, cb_compl, cb_blocking, cb_data);
1064         RETURN(rc);
1065 }
1066
1067 int lmv_getattr_lock(struct obd_export *exp, struct lustre_id *id,
1068                      char *filename, int namelen, __u64 valid,
1069                      unsigned int ea_size, struct ptlrpc_request **request)
1070 {
1071         int rc, mds = id_group(id), loop = 0;
1072         struct obd_device *obd = exp->exp_obd;
1073         struct lmv_obd *lmv = &obd->u.lmv;
1074         struct lustre_id rid = *id;
1075         struct mds_body *body;
1076         struct lmv_obj *obj;
1077         ENTRY;
1078
1079         rc = lmv_check_connect(obd);
1080         if (rc)
1081                 RETURN(rc);
1082 repeat:
1083         LASSERT(++loop <= 2);
1084         obj = lmv_grab_obj(obd, id);
1085         if (obj) {
1086                 /* directory is splitted. look for right mds for this name */
1087                 mds = raw_name2idx(obj->hashtype, obj->objcount,
1088                                    filename, namelen - 1);
1089                 rid = obj->objs[mds].id;
1090                 lmv_put_obj(obj);
1091         }
1092
1093         CDEBUG(D_OTHER, "getattr_lock for %*s on "DLID4" -> "DLID4"\n",
1094                namelen, filename, OLID4(id), OLID4(&rid));
1095
1096         rc = md_getattr_lock(lmv->tgts[id_group(&rid)].ltd_exp,
1097                              &rid, filename, namelen, valid,
1098                              ea_size, request);
1099         if (rc == 0) {
1100                 /*
1101                  * this could be cross-node reference. in this case all we have
1102                  * right now is lustre_id triple. we'd like to find other
1103                  * attributes.
1104                  */
1105                 body = lustre_msg_buf((*request)->rq_repmsg, 0, sizeof(*body));
1106                 LASSERT(body != NULL);
1107                 if (body->valid & OBD_MD_MDS) {
1108                         struct ptlrpc_request *req = NULL;
1109
1110                         rid = body->id1;
1111                         CDEBUG(D_OTHER, "request attrs for "DLID4"\n", OLID4(&rid));
1112
1113                         rc = md_getattr_lock(lmv->tgts[id_group(&rid)].ltd_exp,
1114                                              &rid, NULL, 1, valid, ea_size, &req);
1115                         ptlrpc_req_finished(*request);
1116                         *request = req;
1117                 }
1118         } else if (rc == -ERESTART) {
1119                 /* directory got splitted. time to update local object and
1120                  * repeat the request with proper MDS */
1121                 rc = lmv_get_mea_and_update_object(exp, &rid);
1122                 if (rc == 0) {
1123                         ptlrpc_req_finished(*request);
1124                         goto repeat;
1125                 }
1126         }
1127         RETURN(rc);
1128 }
1129
1130 /*
1131  * llite passes id of an target inode in data->id1 and id of directory in
1132  * data->id2
1133  */
1134 int lmv_link(struct obd_export *exp, struct mdc_op_data *data,
1135              struct ptlrpc_request **request)
1136 {
1137         struct obd_device *obd = exp->exp_obd;
1138         struct lmv_obd *lmv = &obd->u.lmv;
1139         struct lmv_obj *obj;
1140         int rc;
1141         ENTRY;
1142
1143         rc = lmv_check_connect(obd);
1144         if (rc)
1145                 RETURN(rc);
1146
1147         if (data->namelen != 0) {
1148                 /* usual link request */
1149                 obj = lmv_grab_obj(obd, &data->id1);
1150                 if (obj) {
1151                         rc = raw_name2idx(obj->hashtype, obj->objcount,
1152                                           data->name, data->namelen);
1153                         data->id1 = obj->objs[rc].id;
1154                         lmv_put_obj(obj);
1155                 }
1156
1157                 CDEBUG(D_OTHER,"link "DLID4":%*s to "DLID4"\n",
1158                        OLID4(&data->id2), data->namelen, data->name,
1159                        OLID4(&data->id1));
1160         } else {
1161                 /* request from MDS to acquire i_links for inode by id1 */
1162                 CDEBUG(D_OTHER, "inc i_nlinks for "DLID4"\n",
1163                        OLID4(&data->id1));
1164         }
1165
1166         rc = md_link(lmv->tgts[id_group(&data->id1)].ltd_exp,
1167                      data, request);
1168         RETURN(rc);
1169 }
1170
1171 int lmv_rename(struct obd_export *exp, struct mdc_op_data *data,
1172                const char *old, int oldlen, const char *new, int newlen,
1173                struct ptlrpc_request **request)
1174 {
1175         struct obd_device *obd = exp->exp_obd;
1176         struct lmv_obd *lmv = &obd->u.lmv;
1177         struct lmv_obj *obj;
1178         int rc, mds;
1179         ENTRY;
1180
1181         CDEBUG(D_OTHER, "rename %*s in "DLID4" to %*s in "DLID4"\n",
1182                oldlen, old, OLID4(&data->id1), newlen, new,
1183                OLID4(&data->id2));
1184
1185         rc = lmv_check_connect(obd);
1186         if (rc)
1187                 RETURN(rc);
1188
1189         if (oldlen == 0) {
1190                 /*
1191                  * MDS with old dir entry is asking another MDS to create name
1192                  * there.
1193                  */
1194                 CDEBUG(D_OTHER,
1195                        "create %*s(%d/%d) in "DLID4" pointing "
1196                        "to "DLID4"\n", newlen, new, oldlen, newlen,
1197                        OLID4(&data->id2), OLID4(&data->id1));
1198
1199                 mds = id_group(&data->id2);
1200
1201                 /*
1202                  * target directory can be splitted, sowe should forward request
1203                  * to the right MDS.
1204                  */
1205                 obj = lmv_grab_obj(obd, &data->id2);
1206                 if (obj) {
1207                         mds = raw_name2idx(obj->hashtype, obj->objcount,
1208                                            (char *)new, newlen);
1209                         data->id2 = obj->objs[mds].id;
1210                         CDEBUG(D_OTHER, "forward to MDS #%u ("DLID4")\n", mds,
1211                                OLID4(&data->id2));
1212                         lmv_put_obj(obj);
1213                 }
1214                 goto request;
1215         }
1216
1217         obj = lmv_grab_obj(obd, &data->id1);
1218         if (obj) {
1219                 /*
1220                  * directory is already splitted, so we have to forward request
1221                  * to the right MDS.
1222                  */
1223                 mds = raw_name2idx(obj->hashtype, obj->objcount,
1224                                    (char *)old, oldlen);
1225                 data->id1 = obj->objs[mds].id;
1226                 CDEBUG(D_OTHER, "forward to MDS #%u ("DLID4")\n", mds,
1227                        OLID4(&data->id1));
1228                 lmv_put_obj(obj);
1229         }
1230
1231         obj = lmv_grab_obj(obd, &data->id2);
1232         if (obj) {
1233                 /*
1234                  * directory is already splitted, so we have to forward request
1235                  * to the right MDS.
1236                  */
1237                 mds = raw_name2idx(obj->hashtype, obj->objcount,
1238                                    (char *)new, newlen);
1239
1240                 data->id2 = obj->objs[mds].id;
1241                 CDEBUG(D_OTHER, "forward to MDS #%u ("DLID4")\n", mds,
1242                        OLID4(&data->id2));
1243                 lmv_put_obj(obj);
1244         }
1245
1246         mds = id_group(&data->id1);
1247
1248 request:
1249         if (id_group(&data->id1) != id_group(&data->id2)) {
1250                 CDEBUG(D_OTHER,"cross-node rename "DLID4"/%*s to "DLID4"/%*s\n",
1251                        OLID4(&data->id1), oldlen, old, OLID4(&data->id2),
1252                        newlen, new);
1253         }
1254
1255         rc = md_rename(lmv->tgts[mds].ltd_exp, data, old, oldlen,
1256                        new, newlen, request);
1257         RETURN(rc);
1258 }
1259
1260 int lmv_setattr(struct obd_export *exp, struct mdc_op_data *data,
1261                 struct iattr *iattr, void *ea, int ealen, void *ea2,
1262                 int ea2len, struct ptlrpc_request **request)
1263 {
1264         struct obd_device *obd = exp->exp_obd;
1265         struct lmv_obd *lmv = &obd->u.lmv;
1266         struct ptlrpc_request *req;
1267         struct mds_body *body;
1268         struct lmv_obj *obj;
1269         int rc = 0, i;
1270         ENTRY;
1271
1272         rc = lmv_check_connect(obd);
1273         if (rc)
1274                 RETURN(rc);
1275
1276         obj = lmv_grab_obj(obd, &data->id1);
1277
1278         CDEBUG(D_OTHER, "SETATTR for "DLID4", valid 0x%x%s\n",
1279                OLID4(&data->id1), iattr->ia_valid, obj ? ", splitted" : "");
1280
1281         if (obj) {
1282                 for (i = 0; i < obj->objcount; i++) {
1283                         data->id1 = obj->objs[i].id;
1284
1285                         rc = md_setattr(lmv->tgts[id_group(&data->id1)].ltd_exp,
1286                                         data, iattr, ea, ealen, ea2, ea2len, &req);
1287
1288                         if (id_equal_fid(&obj->id, &obj->objs[i].id)) {
1289                                 /*
1290                                  * this is master object and this request should
1291                                  * be returned back to llite.
1292                                  */
1293                                 *request = req;
1294                         } else {
1295                                 ptlrpc_req_finished(req);
1296                         }
1297
1298                         if (rc)
1299                                 break;
1300                 }
1301                 lmv_put_obj(obj);
1302         } else {
1303                 LASSERT(id_group(&data->id1) < lmv->desc.ld_tgt_count);
1304                 rc = md_setattr(lmv->tgts[id_group(&data->id1)].ltd_exp,
1305                                 data, iattr, ea, ealen, ea2, ea2len, request);
1306                 if (rc == 0) {
1307                         body = lustre_msg_buf((*request)->rq_repmsg, 0,
1308                                               sizeof(*body));
1309                         LASSERT(body != NULL);
1310                         LASSERT(id_group(&body->id1) == id_group(&data->id1));
1311                 }
1312         }
1313         RETURN(rc);
1314 }
1315
1316 int lmv_sync(struct obd_export *exp, struct lustre_id *id,
1317              struct ptlrpc_request **request)
1318 {
1319         struct obd_device *obd = exp->exp_obd;
1320         struct lmv_obd *lmv = &obd->u.lmv;
1321         int rc;
1322         ENTRY;
1323
1324         rc = lmv_check_connect(obd);
1325         if (rc)
1326                 RETURN(rc);
1327
1328         rc = md_sync(lmv->tgts[id_group(id)].ltd_exp,
1329                      id, request);
1330         RETURN(rc);
1331 }
1332
1333 int lmv_dirobj_blocking_ast(struct ldlm_lock *lock,
1334                             struct ldlm_lock_desc *desc,
1335                             void *data, int flag)
1336 {
1337         struct lustre_handle lockh;
1338         struct lmv_obj *obj;
1339         int rc;
1340         ENTRY;
1341
1342         switch (flag) {
1343         case LDLM_CB_BLOCKING:
1344                 ldlm_lock2handle(lock, &lockh);
1345                 rc = ldlm_cli_cancel(&lockh);
1346                 if (rc < 0) {
1347                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
1348                         RETURN(rc);
1349                 }
1350                 break;
1351         case LDLM_CB_CANCELING:
1352                 /* time to drop cached attrs for dirobj */
1353                 obj = lock->l_ast_data;
1354                 if (obj) {
1355                         CDEBUG(D_OTHER, "cancel %s on "LPU64"/"LPU64
1356                                ", master "DLID4"\n",
1357                                lock->l_resource->lr_name.name[3] == 1 ?
1358                                "LOOKUP" : "UPDATE",
1359                                lock->l_resource->lr_name.name[0],
1360                                lock->l_resource->lr_name.name[1],
1361                                OLID4(&obj->id));
1362                         lmv_put_obj(obj);
1363                 }
1364                 break;
1365         default:
1366                 LBUG();
1367         }
1368         RETURN(0);
1369 }
1370
1371 void lmv_remove_dots(struct page *page)
1372 {
1373         unsigned limit = PAGE_CACHE_SIZE;
1374         char *kaddr = page_address(page);
1375         struct ext2_dir_entry_2 *p;
1376         unsigned offs, rec_len;
1377
1378         for (offs = 0; offs <= limit - EXT2_DIR_REC_LEN(1); offs += rec_len) {
1379                 p = (struct ext2_dir_entry_2 *)(kaddr + offs);
1380                 rec_len = le16_to_cpu(p->rec_len);
1381
1382                 if ((p->name_len == 1 && p->name[0] == '.') ||
1383                     (p->name_len == 2 && p->name[0] == '.' && p->name[1] == '.'))
1384                         p->inode = 0;
1385         }
1386 }
1387
1388 int lmv_readpage(struct obd_export *exp, struct lustre_id *id,
1389                  __u64 offset, struct page *page,
1390                  struct ptlrpc_request **request)
1391 {
1392         struct obd_device *obd = exp->exp_obd;
1393         struct lmv_obd *lmv = &obd->u.lmv;
1394         struct lustre_id rid = *id;
1395         struct lmv_obj *obj;
1396         int rc, i;
1397         ENTRY;
1398
1399 #warning "we need well-desgined readdir() implementation"
1400         rc = lmv_check_connect(obd);
1401         if (rc)
1402                 RETURN(rc);
1403
1404         LASSERT(id_group(id) < lmv->desc.ld_tgt_count);
1405         CDEBUG(D_OTHER, "READPAGE at %llu from "DLID4"\n",
1406                offset, OLID4(&rid));
1407
1408         obj = lmv_grab_obj(obd, id);
1409         if (obj) {
1410                 lmv_lock_obj(obj);
1411
1412                 /* find dirobj containing page with requested offset. */
1413                 for (i = 0; i < obj->objcount; i++) {
1414                         if (offset < obj->objs[i].size)
1415                                 break;
1416                         offset -= obj->objs[i].size;
1417                 }
1418                 rid = obj->objs[i].id;
1419
1420                 lmv_unlock_obj(obj);
1421                 lmv_put_obj(obj);
1422
1423                 CDEBUG(D_OTHER, "forward to "DLID4" with offset %lu\n",
1424                        OLID4(&rid), (unsigned long)offset);
1425         }
1426         rc = md_readpage(lmv->tgts[id_group(&rid)].ltd_exp, &rid,
1427                          offset, page, request);
1428
1429         if (rc == 0 && !id_equal_fid(&rid, id))
1430                 /* this page isn't from master object. To avoid "." and ".."
1431                  * duplication in directory, we have to remove them from all
1432                  * slave objects */
1433                 lmv_remove_dots(page);
1434
1435         RETURN(rc);
1436 }
1437
1438 int lmv_unlink_slaves(struct obd_export *exp, struct mdc_op_data *data,
1439                       struct ptlrpc_request **req)
1440 {
1441         struct obd_device *obd = exp->exp_obd;
1442         struct lmv_obd *lmv = &obd->u.lmv;
1443         struct mea *mea = data->mea1;
1444         struct mdc_op_data *data2;
1445         int i, rc = 0;
1446         ENTRY;
1447
1448         OBD_ALLOC(data2, sizeof(*data2));
1449         if (data2 == NULL)
1450                 RETURN(-ENOMEM);
1451
1452         LASSERT(mea != NULL);
1453         for (i = 0; i < mea->mea_count; i++) {
1454                 memset(data2, 0, sizeof(*data2));
1455                 data2->id1 = mea->mea_ids[i];
1456                 data2->create_mode = MDS_MODE_DONT_LOCK | S_IFDIR;
1457
1458                 if (lmv->tgts[id_group(&data2->id1)].ltd_exp == NULL)
1459                         continue;
1460
1461                 rc = md_unlink(lmv->tgts[id_group(&data2->id1)].ltd_exp,
1462                                data2, req);
1463
1464                 CDEBUG(D_OTHER, "unlink slave "DLID4" -> %d\n",
1465                        OLID4(&mea->mea_ids[i]), rc);
1466
1467                 if (*req) {
1468                         ptlrpc_req_finished(*req);
1469                         *req = NULL;
1470                 }
1471                 if (rc)
1472                         RETURN(rc);
1473         }
1474         OBD_FREE(data2, sizeof(*data2));
1475         RETURN(rc);
1476 }
1477
1478 int lmv_delete_inode(struct obd_export *exp, struct lustre_id *id)
1479 {
1480         ENTRY;
1481
1482         LASSERT(exp && id);
1483         if (lmv_delete_obj(exp, id)) {
1484                 CDEBUG(D_OTHER, "lmv object "DLID4" is destroyed.\n",
1485                        OLID4(id));
1486         }
1487         RETURN(0);
1488 }
1489
1490 int lmv_unlink(struct obd_export *exp, struct mdc_op_data *data,
1491                struct ptlrpc_request **request)
1492 {
1493         struct obd_device *obd = exp->exp_obd;
1494         struct lmv_obd *lmv = &obd->u.lmv;
1495         int rc, i = 0;
1496         ENTRY;
1497
1498         rc = lmv_check_connect(obd);
1499         if (rc)
1500                 RETURN(rc);
1501
1502         if (data->namelen == 0 && data->mea1 != NULL) {
1503                 /* mds asks to remove slave objects */
1504                 rc = lmv_unlink_slaves(exp, data, request);
1505                 RETURN(rc);
1506         }
1507
1508         if (data->namelen != 0) {
1509                 struct lmv_obj *obj;
1510
1511                 obj = lmv_grab_obj(obd, &data->id1);
1512                 if (obj) {
1513                         i = raw_name2idx(obj->hashtype, obj->objcount,
1514                                          data->name, data->namelen);
1515                         data->id1 = obj->objs[i].id;
1516                         lmv_put_obj(obj);
1517                 }
1518                 CDEBUG(D_OTHER, "unlink '%*s' in "DLID4" -> %u\n",
1519                        data->namelen, data->name, OLID4(&data->id1),
1520                        i);
1521         } else {
1522                 CDEBUG(D_OTHER, "drop i_nlink on "DLID4"\n",
1523                        OLID4(&data->id1));
1524         }
1525         rc = md_unlink(lmv->tgts[id_group(&data->id1)].ltd_exp,
1526                        data, request);
1527         RETURN(rc);
1528 }
1529
1530 struct obd_device *lmv_get_real_obd(struct obd_export *exp,
1531                                     char *name, int len)
1532 {
1533         struct obd_device *obd = exp->exp_obd;
1534         struct lmv_obd *lmv = &obd->u.lmv;
1535         int rc;
1536         ENTRY;
1537
1538         rc = lmv_check_connect(obd);
1539         if (rc)
1540                 RETURN(ERR_PTR(rc));
1541         obd = lmv->tgts[0].ltd_exp->exp_obd;
1542         EXIT;
1543
1544         return obd;
1545 }
1546
1547 int lmv_init_ea_size(struct obd_export *exp, int easize,
1548                      int cookiesize)
1549 {
1550         struct obd_device *obd = exp->exp_obd;
1551         struct lmv_obd *lmv = &obd->u.lmv;
1552         int i, rc = 0, change = 0;
1553         ENTRY;
1554
1555         if (lmv->max_easize < easize) {
1556                 lmv->max_easize = easize;
1557                 change = 1;
1558         }
1559         if (lmv->max_cookiesize < cookiesize) {
1560                 lmv->max_cookiesize = cookiesize;
1561                 change = 1;
1562         }
1563         if (change == 0)
1564                 RETURN(0);
1565
1566         if (lmv->connected == 0)
1567                 RETURN(0);
1568
1569         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1570                 if (lmv->tgts[i].ltd_exp == NULL) {
1571                         CWARN("%s: NULL export for %d\n", obd->obd_name, i);
1572                         continue;
1573                 }
1574
1575                 rc = obd_init_ea_size(lmv->tgts[i].ltd_exp, easize, cookiesize);
1576                 if (rc) {
1577                         CERROR("obd_init_ea_size() failed on MDT target %d, "
1578                                "error %d.\n", i, rc);
1579                         break;
1580                 }
1581         }
1582         RETURN(rc);
1583 }
1584
1585 int lmv_obd_create_single(struct obd_export *exp, struct obdo *oa,
1586                           struct lov_stripe_md **ea, struct obd_trans_info *oti)
1587 {
1588         struct obd_device *obd = exp->exp_obd;
1589         struct lmv_obd *lmv = &obd->u.lmv;
1590         struct lov_stripe_md obj_md;
1591         struct lov_stripe_md *obj_mdp = &obj_md;
1592         int rc = 0;
1593         ENTRY;
1594
1595         LASSERT(ea == NULL);
1596         LASSERT(oa->o_mds < lmv->desc.ld_tgt_count);
1597
1598         rc = obd_create(lmv->tgts[oa->o_mds].ltd_exp,
1599                         oa, &obj_mdp, oti);
1600
1601         RETURN(rc);
1602 }
1603
1604 int lmv_getready(struct obd_export *exp)
1605 {
1606         struct obd_device *obd = exp->exp_obd;
1607         int rc = 0;
1608
1609         ENTRY;
1610         rc = lmv_check_connect(obd);
1611         RETURN(rc);
1612 }
1613
1614 /*
1615  * to be called from MDS only. @oa should have correct store cookie and o_fid
1616  * values for "master" object, as it will be used.
1617  */
1618 int lmv_obd_create(struct obd_export *exp, struct obdo *oa,
1619                    struct lov_stripe_md **ea, struct obd_trans_info *oti)
1620 {
1621         struct obd_device *obd = exp->exp_obd;
1622         struct lmv_obd *lmv = &obd->u.lmv;
1623         struct lustre_id mid;
1624         int i, c, rc = 0;
1625         struct mea *mea;
1626         ENTRY;
1627
1628         rc = lmv_check_connect(obd);
1629         if (rc)
1630                 RETURN(rc);
1631
1632         LASSERT(oa != NULL);
1633
1634         if (ea == NULL) {
1635                 rc = lmv_obd_create_single(exp, oa, NULL, oti);
1636                 if (rc)
1637                         CERROR("Can't create object, rc = %d\n", rc);
1638                 RETURN(rc);
1639         }
1640
1641         if (*ea == NULL) {
1642                 rc = obd_alloc_diskmd(exp, (struct lov_mds_md **)ea);
1643                 if (rc < 0) {
1644                         CERROR("obd_alloc_diskmd() failed, error %d\n",
1645                                rc);
1646                         RETURN(rc);
1647                 } else
1648                         rc = 0;
1649
1650                 if (*ea == NULL)
1651                         RETURN(-ENOMEM);
1652         }
1653
1654         /*
1655          * here we should take care about splitted dir, so store cookie and fid
1656          * for "master" object should already be allocated and passed in @oa.
1657          */
1658         LASSERT(oa->o_id != 0);
1659         LASSERT(oa->o_fid != 0);
1660
1661         /* save "master" object id */
1662         obdo2id(&mid, oa);
1663
1664         mea = (struct mea *)*ea;
1665         mea->mea_master = -1;
1666         mea->mea_magic = MEA_MAGIC_ALL_CHARS;
1667
1668         if (!mea->mea_count || mea->mea_count > lmv->desc.ld_tgt_count)
1669                 mea->mea_count = lmv->desc.ld_tgt_count;
1670
1671         for (i = 0, c = 0; c < mea->mea_count && i < lmv->desc.ld_tgt_count; i++) {
1672                 struct lov_stripe_md obj_md;
1673                 struct lov_stripe_md *obj_mdp = &obj_md;
1674
1675                 if (lmv->tgts[i].ltd_exp == NULL) {
1676                         /* this is "master" MDS */
1677                         mea->mea_master = i;
1678                         mea->mea_ids[c] = mid;
1679                         c++;
1680                         continue;
1681                 }
1682
1683                 /*
1684                  * "master" MDS should always be part of stripped dir,
1685                  * so scan for it.
1686                  */
1687                 if (mea->mea_master == -1 && c == mea->mea_count - 1)
1688                         continue;
1689
1690                 oa->o_valid = OBD_MD_FLGENER | OBD_MD_FLTYPE | OBD_MD_FLMODE |
1691                         OBD_MD_FLUID | OBD_MD_FLGID | OBD_MD_FLID;
1692
1693                 rc = obd_create(lmv->tgts[c].ltd_exp, oa, &obj_mdp, oti);
1694                 if (rc) {
1695                         CERROR("obd_create() failed on MDT target %d, "
1696                                "error %d\n", c, rc);
1697                         RETURN(rc);
1698                 }
1699
1700                 CDEBUG(D_OTHER, "dirobj at mds %d: "LPU64"/%u\n",
1701                        i, oa->o_id, oa->o_generation);
1702
1703
1704                 /*
1705                  * here, when object is created (or it is master and was passed
1706                  * from caller) on desired MDS we save its fid to local mea_ids.
1707                  */
1708                 LASSERT(oa->o_fid);
1709
1710                 /*
1711                  * store cookie should be defined here for both cases (master
1712                  * object and not master), because master is already created.
1713                  */
1714                 LASSERT(oa->o_id);
1715
1716                 /* fill mea by store cookie and fid */
1717                 obdo2id(&mea->mea_ids[c], oa);
1718                 c++;
1719         }
1720         LASSERT(c == mea->mea_count);
1721
1722         CDEBUG(D_OTHER, "%d dirobjects created\n",
1723                (int)mea->mea_count);
1724
1725         RETURN(rc);
1726 }
1727
1728 static int lmv_llog_init(struct obd_device *obd, struct obd_llogs *llogs,
1729                          struct obd_device *tgt, int count,
1730                          struct llog_catid *logid)
1731 {
1732         struct llog_ctxt *ctxt;
1733         int rc;
1734         ENTRY;
1735
1736         rc = obd_llog_setup(obd, llogs, LLOG_CONFIG_REPL_CTXT, tgt, 0, NULL,
1737                             &llog_client_ops);
1738         if (rc == 0) {
1739                 ctxt = llog_get_context(llogs, LLOG_CONFIG_REPL_CTXT);
1740                 ctxt->loc_imp = tgt->u.cli.cl_import;
1741         }
1742
1743         RETURN(rc);
1744 }
1745
1746 static int lmv_llog_finish(struct obd_device *obd,
1747                            struct obd_llogs *llogs, int count)
1748 {
1749         int rc;
1750         ENTRY;
1751
1752         rc = obd_llog_cleanup(llog_get_context(llogs, LLOG_CONFIG_REPL_CTXT));
1753         RETURN(rc);
1754 }
1755
1756 static int lmv_get_info(struct obd_export *exp, __u32 keylen,
1757                         void *key, __u32 *vallen, void *val)
1758 {
1759         struct obd_device *obd;
1760         struct lmv_obd *lmv;
1761         int rc = 0;
1762         ENTRY;
1763
1764         obd = class_exp2obd(exp);
1765         if (obd == NULL) {
1766                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
1767                        exp->exp_handle.h_cookie);
1768                 RETURN(-EINVAL);
1769         }
1770
1771         lmv = &obd->u.lmv;
1772         if (keylen == 6 && memcmp(key, "mdsize", 6) == 0) {
1773                 __u32 *mdsize = val;
1774                 *vallen = sizeof(__u32);
1775                 *mdsize = sizeof(struct lustre_id) * lmv->desc.ld_tgt_count
1776                         + sizeof(struct mea);
1777                 RETURN(0);
1778         } else if (keylen == 6 && memcmp(key, "mdsnum", 6) == 0) {
1779                 struct obd_uuid *cluuid = &lmv->cluuid;
1780                 struct lmv_tgt_desc *tgts;
1781                 __u32 *mdsnum = val;
1782                 int i;
1783
1784                 for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgts++) {
1785                         if (obd_uuid_equals(&tgts->uuid, cluuid)) {
1786                                 *vallen = sizeof(__u32);
1787                                 *mdsnum = i;
1788                                 RETURN(0);
1789                         }
1790                 }
1791                 LASSERT(0);
1792         } else if (keylen == 6 && memcmp(key, "rootid", 6) == 0) {
1793                 /* getting rootid from first MDS. */
1794                 rc = obd_get_info(lmv->tgts[0].ltd_exp, keylen, key,
1795                                   vallen, val);
1796                 RETURN(rc);
1797         } else if (keylen >= strlen("lmvdesc") && strcmp(key, "lmvdesc") == 0) {
1798                 struct lmv_desc *desc_ret = val;
1799                 *desc_ret = lmv->desc;
1800                 RETURN(0);
1801         }
1802
1803         CDEBUG(D_IOCTL, "invalid key\n");
1804         RETURN(-EINVAL);
1805 }
1806
1807 int lmv_set_info(struct obd_export *exp, obd_count keylen,
1808                  void *key, obd_count vallen, void *val)
1809 {
1810         struct obd_device *obd;
1811         struct lmv_obd *lmv;
1812         ENTRY;
1813
1814         obd = class_exp2obd(exp);
1815         if (obd == NULL) {
1816                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
1817                        exp->exp_handle.h_cookie);
1818                 RETURN(-EINVAL);
1819         }
1820         lmv = &obd->u.lmv;
1821
1822         if (keylen >= strlen("inter_mds") && strcmp(key, "inter_mds") == 0) {
1823                 lmv->server_timeout = 1;
1824                 lmv_set_timeouts(obd);
1825                 RETURN(0);
1826         }
1827
1828         RETURN(-EINVAL);
1829 }
1830
1831 int lmv_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
1832                struct lov_stripe_md *lsm)
1833 {
1834         struct obd_device *obd = class_exp2obd(exp);
1835         struct lmv_obd *lmv = &obd->u.lmv;
1836         struct mea *meap, *lsmp;
1837         int mea_size, i;
1838         ENTRY;
1839
1840         mea_size = (sizeof(struct lustre_id) *
1841                     lmv->desc.ld_tgt_count) + sizeof(struct mea);
1842         if (!lmmp)
1843                 RETURN(mea_size);
1844
1845         if (*lmmp && !lsm) {
1846                 OBD_FREE(*lmmp, mea_size);
1847                 *lmmp = NULL;
1848                 RETURN(0);
1849         }
1850
1851         if (*lmmp == NULL) {
1852                 OBD_ALLOC(*lmmp, mea_size);
1853                 if (*lmmp == NULL)
1854                         RETURN(-ENOMEM);
1855         }
1856
1857         if (!lsm)
1858                 RETURN(mea_size);
1859
1860         lsmp = (struct mea *)lsm;
1861         meap = (struct mea *)*lmmp;
1862
1863         meap->mea_magic = cpu_to_le32(lsmp->mea_magic);
1864         meap->mea_count = cpu_to_le32(lsmp->mea_count);
1865         meap->mea_master = cpu_to_le32(lsmp->mea_master);
1866
1867         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1868                 meap->mea_ids[i] = meap->mea_ids[i];
1869                 id_cpu_to_le(&meap->mea_ids[i]);
1870         }
1871
1872         RETURN(mea_size);
1873 }
1874
1875 int lmv_unpackmd(struct obd_export *exp, struct lov_stripe_md **mem_tgt,
1876                  struct lov_mds_md *disk_src, int mdsize)
1877 {
1878         struct obd_device *obd = class_exp2obd(exp);
1879         struct mea **tmea = (struct mea **)mem_tgt;
1880         struct mea *mea = (struct mea *)disk_src;
1881         struct lmv_obd *lmv = &obd->u.lmv;
1882         int mea_size, i;
1883         ENTRY;
1884
1885         mea_size = sizeof(struct lustre_id) *
1886                 lmv->desc.ld_tgt_count + sizeof(struct mea);
1887         if (mem_tgt == NULL)
1888                 return mea_size;
1889
1890         if (*mem_tgt != NULL && disk_src == NULL) {
1891                 OBD_FREE(*tmea, mea_size);
1892                 RETURN(0);
1893         }
1894
1895         LASSERT(mea_size == mdsize);
1896
1897         OBD_ALLOC(*tmea, mea_size);
1898         if (*tmea == NULL)
1899                 RETURN(-ENOMEM);
1900
1901         if (!disk_src)
1902                 RETURN(mea_size);
1903
1904         (*tmea)->mea_magic = le32_to_cpu(mea->mea_magic);
1905         (*tmea)->mea_count = le32_to_cpu(mea->mea_count);
1906         (*tmea)->mea_master = le32_to_cpu(mea->mea_master);
1907
1908         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
1909                 (*tmea)->mea_ids[i] = mea->mea_ids[i];
1910                 id_le_to_cpu(&(*tmea)->mea_ids[i]);
1911         }
1912
1913         RETURN(mea_size);
1914 }
1915
1916 int lmv_brw(int rw, struct obd_export *exp, struct obdo *oa,
1917             struct lov_stripe_md *ea, obd_count oa_bufs,
1918             struct brw_page *pgarr, struct obd_trans_info *oti)
1919 {
1920         struct obd_device *obd = exp->exp_obd;
1921         struct lmv_obd *lmv = &obd->u.lmv;
1922         struct mea *mea = (struct mea *) ea;
1923         int err;
1924
1925         LASSERT(oa != NULL);
1926         LASSERT(ea != NULL);
1927         LASSERT(pgarr != NULL);
1928         LASSERT(oa->o_mds < lmv->desc.ld_tgt_count);
1929
1930         oa->o_gr = id_gen(&mea->mea_ids[oa->o_mds]);
1931         oa->o_id = id_ino(&mea->mea_ids[oa->o_mds]);
1932         oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
1933
1934         err = obd_brw(rw, lmv->tgts[oa->o_mds].ltd_exp,
1935                       oa, NULL, oa_bufs, pgarr, oti);
1936         RETURN(err);
1937 }
1938
1939 struct obd_ops lmv_obd_ops = {
1940         .o_owner                = THIS_MODULE,
1941         .o_attach               = lmv_attach,
1942         .o_detach               = lmv_detach,
1943         .o_setup                = lmv_setup,
1944         .o_cleanup              = lmv_cleanup,
1945         .o_connect              = lmv_connect,
1946         .o_disconnect           = lmv_disconnect,
1947         .o_statfs               = lmv_statfs,
1948         .o_llog_init            = lmv_llog_init,
1949         .o_llog_finish          = lmv_llog_finish,
1950         .o_get_info             = lmv_get_info,
1951         .o_set_info             = lmv_set_info,
1952         .o_create               = lmv_obd_create,
1953         .o_packmd               = lmv_packmd,
1954         .o_unpackmd             = lmv_unpackmd,
1955         .o_brw                  = lmv_brw,
1956         .o_init_ea_size         = lmv_init_ea_size,
1957         .o_notify               = lmv_notify,
1958         .o_iocontrol            = lmv_iocontrol,
1959         .o_getready             = lmv_getready,
1960 };
1961
1962 struct md_ops lmv_md_ops = {
1963         .m_getstatus           = lmv_getstatus,
1964         .m_getattr             = lmv_getattr,
1965         .m_change_cbdata       = lmv_change_cbdata,
1966         .m_change_cbdata_name  = lmv_change_cbdata_name,
1967         .m_close               = lmv_close,
1968         .m_create              = lmv_create,
1969         .m_done_writing        = lmv_done_writing,
1970         .m_enqueue             = lmv_enqueue,
1971         .m_getattr_lock        = lmv_getattr_lock,
1972         .m_intent_lock         = lmv_intent_lock,
1973         .m_link                = lmv_link,
1974         .m_rename              = lmv_rename,
1975         .m_setattr             = lmv_setattr,
1976         .m_sync                = lmv_sync,
1977         .m_readpage            = lmv_readpage,
1978         .m_unlink              = lmv_unlink,
1979         .m_get_real_obd        = lmv_get_real_obd,
1980         .m_valid_attrs         = lmv_valid_attrs,
1981         .m_delete_inode        = lmv_delete_inode,
1982 };
1983
1984 int __init lmv_init(void)
1985 {
1986         struct lprocfs_static_vars lvars;
1987         int rc;
1988
1989         obj_cache = kmem_cache_create("lmv_objects",
1990                                       sizeof(struct lmv_obj),
1991                                       0, 0, NULL, NULL);
1992         if (!obj_cache) {
1993                 CERROR("error allocating lmv objects cache\n");
1994                 return -ENOMEM;
1995         }
1996
1997         lprocfs_init_vars(lmv, &lvars);
1998         rc = class_register_type(&lmv_obd_ops, &lmv_md_ops,
1999                                  lvars.module_vars,
2000                                  OBD_LMV_DEVICENAME);
2001         if (rc)
2002                 kmem_cache_destroy(obj_cache);
2003
2004         return rc;
2005 }
2006
2007 #ifdef __KERNEL__
2008 static void lmv_exit(void)
2009 {
2010         class_unregister_type(OBD_LMV_DEVICENAME);
2011
2012         LASSERTF(kmem_cache_destroy(obj_cache) == 0,
2013                  "can't free lmv objects cache, %d object(s)"
2014                  "still in use\n", atomic_read(&obj_cache_count));
2015 }
2016
2017 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
2018 MODULE_DESCRIPTION("Lustre Logical Metadata Volume OBD driver");
2019 MODULE_LICENSE("GPL");
2020
2021 module_init(lmv_init);
2022 module_exit(lmv_exit);
2023 #endif