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 /* Error codes:
  53  *
  54  *  -EINVAL  : UUID can't be found in the LMV's target list
  55  *  -ENOTCONN: The UUID is found, but the target connection is bad (!)
  56  *  -EBADF   : The UUID is found, but the OBD of the wrong type (!)
  57  */
  58 static int lmv_set_mdc_active(struct lmv_obd *lmv, struct obd_uuid *uuid,
  59                               int activate)
  60 {
  61         struct obd_device *obd;
  62         struct lmv_tgt_desc *tgt;
  63         int i, rc = 0;
  64         ENTRY;
  65
  66         CDEBUG(D_INFO, "Searching in lmv %p for uuid %s (activate=%d)\n",
  67                lmv, uuid->uuid, activate);
  68
  69         spin_lock(&lmv->lmv_lock);
  70         for (i = 0, tgt = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgt++) {
  71                 CDEBUG(D_INFO, "lmv idx %d is %s conn "LPX64"\n",
  72                        i, tgt->uuid.uuid, tgt->ltd_exp->exp_handle.h_cookie);
  73                 if (strncmp(uuid->uuid, tgt->uuid.uuid, sizeof uuid->uuid) == 0)
  74                         break;
  75         }
  76
  77         if (i == lmv->desc.ld_tgt_count)
  78                 GOTO(out, rc = -EINVAL);
  79
  80         obd = class_exp2obd(tgt->ltd_exp);
  81         if (obd == NULL)
  82                 GOTO(out, rc = -ENOTCONN);
  83
  84         CDEBUG(D_INFO, "Found OBD %s=%s device %d (%p) type %s at LMV idx %d\n",
  85                obd->obd_name, obd->obd_uuid.uuid, obd->obd_minor, obd,
  86                obd->obd_type->typ_name, i);
  87         LASSERT(strcmp(obd->obd_type->typ_name, LUSTRE_MDC_NAME) == 0);
  88
  89         if (tgt->active == activate) {
  90                 CDEBUG(D_INFO, "OBD %p already %sactive!\n", obd,
  91                        activate ? "" : "in");
  92                 GOTO(out, rc);
  93         }
  94
  95         CDEBUG(D_INFO, "Marking OBD %p %sactive\n", obd, activate ? "" : "in");
  96
  97         tgt->active = activate;
  98         if (activate)
  99                 lmv->desc.ld_active_tgt_count++;
 100         else
 101                 lmv->desc.ld_active_tgt_count--;
 102
 103         EXIT;
 104  out:
 105         spin_unlock(&lmv->lmv_lock);
 106         return rc;
 107 }
 108
 109 static int lmv_notify(struct obd_device *obd, struct obd_device *watched,
 110                       int active)
 111 {
 112         int rc;
 113         struct obd_uuid *uuid;
 114
 115         if (strcmp(watched->obd_type->typ_name, LUSTRE_MDC_NAME)) {
 116                 CERROR("unexpected notification of %s %s!\n",
 117                        watched->obd_type->typ_name,
 118                        watched->obd_name);
 119                 return -EINVAL;
 120         }
 121         uuid = &watched->u.cli.cl_import->imp_target_uuid;
 122
 123         /* Set MDC as active before notifying the observer, so the
 124          * observer can use the MDC normally.
 125          */
 126         rc = lmv_set_mdc_active(&obd->u.lmv, uuid, active);
 127         if (rc) {
 128                 CERROR("%sactivation of %s failed: %d\n",
 129                        active ? "" : "de", uuid->uuid, rc);
 130                 RETURN(rc);
 131         }
 132
 133         if (obd->obd_observer)
 134                 /* Pass the notification up the chain. */
 135                 rc = obd_notify(obd->obd_observer, watched, active);
 136
 137         RETURN(rc);
 138 }
 139
 140 int lmv_attach(struct obd_device *dev, obd_count len, void *data)
 141 {
 142         struct lprocfs_static_vars lvars;
 143         int rc;
 144         ENTRY;
 145
 146         lprocfs_init_vars(lmv, &lvars);
 147         rc = lprocfs_obd_attach(dev, lvars.obd_vars);
 148         if (rc == 0) {
 149 #ifdef __KERNEL__
 150                 struct proc_dir_entry *entry;
 151
 152                 entry = create_proc_entry("target_obd", 0444, dev->obd_proc_entry);
 153                 if (entry == NULL)
 154                         RETURN(-ENOMEM);
 155                 /* entry->proc_fops = &lmv_proc_target_fops; */
 156                 entry->data = dev;
 157 #endif
 158        }
 159         RETURN (rc);
 160 }
 161
 162 int lmv_detach(struct obd_device *dev)
 163 {
 164         return lprocfs_obd_detach(dev);
 165 }
 166
 167 /* This is fake connect function. Its purpose is to initialize lmv and
 168  * say caller that everything is okay. Real connection will be performed
 169  * later. */
 170 static int lmv_connect(struct lustre_handle *conn, struct obd_device *obd,
 171                        struct obd_uuid *cluuid)
 172 {
 173         struct lmv_obd *lmv = &obd->u.lmv;
 174         struct obd_export *exp;
 175         int rc;
 176         ENTRY;
 177
 178         rc = class_connect(conn, obd, cluuid);
 179         if (rc) {
 180                 CERROR("class_connection() returned %d\n", rc);
 181                 RETURN(rc);
 182         }
 183
 184         exp = class_conn2export(conn);
 185         /* We don't want to actually do the underlying connections more than
 186          * once, so keep track. */
 187         lmv->refcount++;
 188         if (lmv->refcount > 1) {
 189                 class_export_put(exp);
 190                 RETURN(0);
 191         }
 192
 193         lmv->cluuid = *cluuid;
 194         lmv->connected = 0;
 195         lmv->exp = exp;
 196
 197         RETURN(0);
 198 }
 199
 200 void lmv_set_timeouts(struct obd_device *obd)
 201 {
 202         struct lmv_tgt_desc *tgts;
 203         struct lmv_obd *lmv;
 204         int i;
 205
 206         lmv = &obd->u.lmv;
 207         if (lmv->server_timeout == 0)
 208                 return;
 209
 210         if (lmv->connected == 0)
 211                 return;
 212
 213         for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgts++) {
 214                 if (tgts->ltd_exp == NULL)
 215                         continue;
 216                 obd_set_info(tgts->ltd_exp, strlen("inter_mds"),
 217                              "inter_mds", 0, NULL);
 218         }
 219 }
 220
 221 /* Performs a check if passed obd is connected. If no - connect it. */
 222 int lmv_check_connect(struct obd_device *obd) {
 223         struct lmv_obd *lmv = &obd->u.lmv;
 224         struct obd_uuid *cluuid;
 225         struct lmv_tgt_desc *tgts;
 226         struct obd_export *exp;
 227         int rc, rc2, i;
 228
 229         if (lmv->connected)
 230                 return 0;
 231
 232         lmv->connected = 1;
 233         cluuid = &lmv->cluuid;
 234         exp = lmv->exp;
 235
 236         CDEBUG(D_OTHER, "time to connect %s to %s\n",
 237                cluuid->uuid, obd->obd_name);
 238
 239         for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgts++) {
 240                 struct obd_device *tgt_obd;
 241                 struct obd_uuid lmv_osc_uuid = { "LMV_OSC_UUID" };
 242                 struct lustre_handle conn = {0, };
 243
 244                 LASSERT(tgts != NULL);
 245
 246                 tgt_obd = class_find_client_obd(&tgts->uuid, LUSTRE_MDC_NAME,
 247                                                 &obd->obd_uuid);
 248                 if (!tgt_obd) {
 249                         CERROR("Target %s not attached\n", tgts->uuid.uuid);
 250                         GOTO(out_disc, rc = -EINVAL);
 251                 }
 252
 253                 /* for MDS: don't connect to yourself */
 254                 if (obd_uuid_equals(&tgts->uuid, cluuid)) {
 255                         CDEBUG(D_OTHER, "don't connect back to %s\n",
 256                                cluuid->uuid);
 257                         tgts->ltd_exp = NULL;
 258                         continue;
 259                 }
 260
 261                 CDEBUG(D_OTHER, "connect to %s(%s) - %s, %s FOR %s\n",
 262                         tgt_obd->obd_name, tgt_obd->obd_uuid.uuid,
 263                         tgts->uuid.uuid, obd->obd_uuid.uuid,
 264                         cluuid->uuid);
 265
 266                 if (!tgt_obd->obd_set_up) {
 267                         CERROR("Target %s not set up\n", tgts->uuid.uuid);
 268                         GOTO(out_disc, rc = -EINVAL);
 269                 }
 270
 271                 rc = obd_connect(&conn, tgt_obd, &lmv_osc_uuid);
 272                 if (rc) {
 273                         CERROR("Target %s connect error %d\n",
 274                                 tgts->uuid.uuid, rc);
 275                         GOTO(out_disc, rc);
 276                 }
 277                 tgts->ltd_exp = class_conn2export(&conn);
 278
 279                 obd_init_ea_size(tgts->ltd_exp, lmv->max_easize,
 280                                  lmv->max_cookiesize);
 281
 282                 rc = obd_register_observer(tgt_obd, obd);
 283                 if (rc) {
 284                         CERROR("Target %s register_observer error %d\n",
 285                                tgts->uuid.uuid, rc);
 286                         obd_disconnect(tgts->ltd_exp, 0);
 287                         GOTO(out_disc, rc);
 288                 }
 289
 290                 lmv->desc.ld_active_tgt_count++;
 291                 tgts->active = 1;
 292
 293                 CDEBUG(D_OTHER, "connected to %s(%s) successfully (%d)\n",
 294                         tgt_obd->obd_name, tgt_obd->obd_uuid.uuid,
 295                         atomic_read(&obd->obd_refcount));
 296         }
 297
 298         lmv_set_timeouts(obd);
 299
 300         class_export_put(exp);
 301         return 0;
 302
 303  out_disc:
 304         while (i-- > 0) {
 305                 struct obd_uuid uuid;
 306                 --tgts;
 307                 --lmv->desc.ld_active_tgt_count;
 308                 tgts->active = 0;
 309                 /* save for CERROR below; (we know it's terminated) */
 310                 uuid = tgts->uuid;
 311                 rc2 = obd_disconnect(tgts->ltd_exp, 0);
 312                 if (rc2)
 313                         CERROR("error: LMV target %s disconnect on MDT idx %d: "
 314                                "rc = %d\n", uuid.uuid, i, rc2);
 315         }
 316         class_disconnect(exp, 0);
 317         RETURN (rc);
 318 }
 319
 320 static int lmv_disconnect(struct obd_export *exp, int flags)
 321 {
 322         struct obd_device *obd = class_exp2obd(exp);
 323         struct lmv_obd *lmv = &obd->u.lmv;
 324         int rc, i;
 325         ENTRY;
 326
 327         if (!lmv->tgts)
 328                 goto out_local;
 329
 330         /* Only disconnect the underlying layers on the final disconnect. */
 331         lmv->refcount--;
 332         if (lmv->refcount != 0)
 333                 goto out_local;
 334
 335         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 336                 if (lmv->tgts[i].ltd_exp == NULL)
 337                         continue;
 338
 339                 if (obd->obd_no_recov) {
 340                         /* Pass it on to our clients.
 341                          * XXX This should be an argument to disconnect,
 342                          * XXX not a back-door flag on the OBD.  Ah well.
 343                          */
 344                         struct obd_device *mdc_obd;
 345                         mdc_obd = class_exp2obd(lmv->tgts[i].ltd_exp);
 346                         if (mdc_obd)
 347                                 mdc_obd->obd_no_recov = 1;
 348                 }
 349
 350                 CDEBUG(D_OTHER, "disconnected from %s(%s) successfully\n",
 351                         lmv->tgts[i].ltd_exp->exp_obd->obd_name,
 352                         lmv->tgts[i].ltd_exp->exp_obd->obd_uuid.uuid);
 353
 354                 obd_register_observer(lmv->tgts[i].ltd_exp->exp_obd, NULL);
 355
 356                 rc = obd_disconnect(lmv->tgts[i].ltd_exp, flags);
 357                 if (lmv->tgts[i].active) {
 358                         lmv->desc.ld_active_tgt_count--;
 359                         lmv->tgts[i].active = 0;
 360                 }
 361                 lmv->tgts[i].ltd_exp = NULL;
 362         }
 363
 364 out_local:
 365         /* This is the case when no real connection is established by
 366          * lmv_check_connect(). */
 367         if (!lmv->connected)
 368                 class_export_put(exp);
 369         rc = class_disconnect(exp, 0);
 370         RETURN(rc);
 371 }
 372
 373 static int lmv_iocontrol(unsigned int cmd, struct obd_export *exp,
 374                          int len, void *karg, void *uarg)
 375 {
 376         struct obd_device *obddev = class_exp2obd(exp);
 377         struct lmv_obd *lmv = &obddev->u.lmv;
 378         int i, rc = 0, set = 0;
 379
 380         ENTRY;
 381
 382         if (lmv->desc.ld_tgt_count == 0)
 383                 RETURN(-ENOTTY);
 384
 385         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 386                 int err;
 387
 388                 err = obd_iocontrol(cmd, lmv->tgts[i].ltd_exp,
 389                                     len, karg, uarg);
 390                 if (err) {
 391                         if (lmv->tgts[i].active) {
 392                                 CERROR("error: iocontrol MDC %s on MDT"
 393                                        "idx %d: err = %d\n",
 394                                        lmv->tgts[i].uuid.uuid, i, err);
 395                                 if (!rc)
 396                                         rc = err;
 397                         }
 398                 } else
 399                         set = 1;
 400         }
 401         if (!set && !rc)
 402                 rc = -EIO;
 403
 404         RETURN(rc);
 405 }
 406
 407 static int lmv_setup(struct obd_device *obd, obd_count len, void *buf)
 408 {
 409         struct lustre_cfg *lcfg = buf;
 410         struct lmv_desc *desc;
 411         struct lmv_obd *lmv = &obd->u.lmv;
 412         struct obd_uuid *uuids;
 413         struct lmv_tgt_desc *tgts;
 414         int i;
 415         int rc = 0;
 416         ENTRY;
 417
 418         if (lcfg->lcfg_inllen1 < 1) {
 419                 CERROR("LMV setup requires a descriptor\n");
 420                 RETURN(-EINVAL);
 421         }
 422
 423         if (lcfg->lcfg_inllen2 < 1) {
 424                 CERROR("LMV setup requires an OST UUID list\n");
 425                 RETURN(-EINVAL);
 426         }
 427
 428         desc = (struct lmv_desc *)lcfg->lcfg_inlbuf1;
 429         if (sizeof(*desc) > lcfg->lcfg_inllen1) {
 430                 CERROR("descriptor size wrong: %d > %d\n",
 431                        (int)sizeof(*desc), lcfg->lcfg_inllen1);
 432                 RETURN(-EINVAL);
 433         }
 434
 435         uuids = (struct obd_uuid *)lcfg->lcfg_inlbuf2;
 436         if (sizeof(*uuids) * desc->ld_tgt_count != lcfg->lcfg_inllen2) {
 437                 CERROR("UUID array size wrong: %u * %u != %u\n",
 438                        sizeof(*uuids), desc->ld_tgt_count, lcfg->lcfg_inllen2);
 439                 RETURN(-EINVAL);
 440         }
 441
 442         lmv->bufsize = sizeof(struct lmv_tgt_desc) * desc->ld_tgt_count;
 443         OBD_ALLOC(lmv->tgts, lmv->bufsize);
 444         if (lmv->tgts == NULL) {
 445                 CERROR("Out of memory\n");
 446                 RETURN(-EINVAL);
 447         }
 448
 449         lmv->desc = *desc;
 450         spin_lock_init(&lmv->lmv_lock);
 451
 452         for (i = 0, tgts = lmv->tgts; i < desc->ld_tgt_count; i++, tgts++)
 453                 tgts->uuid = uuids[i];
 454
 455         lmv->max_easize = sizeof(struct ll_fid) *
 456                 desc->ld_tgt_count + sizeof(struct mea);
 457
 458         lmv->max_cookiesize = 0;
 459
 460         RETURN(rc);
 461 }
 462
 463 static int lmv_statfs(struct obd_device *obd, struct obd_statfs *osfs,
 464                       unsigned long max_age)
 465 {
 466         struct lmv_obd *lmv = &obd->u.lmv;
 467         struct obd_statfs temp;
 468         int rc = 0, i;
 469         ENTRY;
 470
 471         rc = lmv_check_connect(obd);
 472         if (rc)
 473                 RETURN(rc);
 474
 475         for (i = 0; i < lmv->desc.ld_tgt_count; i++) {
 476                 rc = obd_statfs(lmv->tgts[i].ltd_exp->exp_obd, &temp, max_age);
 477                 if (rc) {
 478                         CERROR("can't stat MDS #%d (%s)\n", i,
 479                                lmv->tgts[i].ltd_exp->exp_obd->obd_name);
 480                         RETURN(rc);
 481                 }
 482                 if (i == 0) {
 483                         memcpy(osfs, &temp, sizeof(temp));
 484                 } else {
 485                         osfs->os_bavail += temp.os_bavail;
 486                         osfs->os_blocks += temp.os_blocks;
 487                         osfs->os_ffree += temp.os_ffree;
 488                         osfs->os_files += temp.os_files;
 489                 }
 490         }
 491         RETURN(rc);
 492 }
 493
 494 static int lmv_cleanup(struct obd_device *obd, int flags)
 495 {
 496         struct lmv_obd *lmv = &obd->u.lmv;
 497         ENTRY;
 498         lmv_cleanup_objs(obd);
 499         OBD_FREE(lmv->tgts, lmv->bufsize);
 500         RETURN(0);
 501 }
 502
 503 static int lmv_getstatus(struct obd_export *exp, struct ll_fid *fid)
 504 {
 505         struct obd_device *obd = exp->exp_obd;
 506         struct lmv_obd *lmv = &obd->u.lmv;
 507         int rc;
 508         ENTRY;
 509         rc = lmv_check_connect(obd);
 510         if (rc)
 511                 RETURN(rc);
 512         rc = md_getstatus(lmv->tgts[0].ltd_exp, fid);
 513         fid->mds = 0;
 514         RETURN(rc);
 515 }
 516
 517 static int lmv_getattr(struct obd_export *exp, struct ll_fid *fid,
 518                 unsigned long valid, unsigned int ea_size,
 519                 struct ptlrpc_request **request)
 520 {
 521         struct obd_device *obd = exp->exp_obd;
 522         struct lmv_obd *lmv = &obd->u.lmv;
 523         int rc, i = fid->mds;
 524         struct lmv_obj *obj;
 525         ENTRY;
 526         rc = lmv_check_connect(obd);
 527         if (rc)
 528                 RETURN(rc);
 529         obj = lmv_grab_obj(obd, fid, 0);
 530         CDEBUG(D_OTHER, "GETATTR for %lu/%lu/%lu %s\n",
 531                (unsigned long) fid->mds,
 532                (unsigned long) fid->id,
 533                (unsigned long) fid->generation,
 534                obj ? "(splitted)" : "");
 535
 536         LASSERT(fid->mds < lmv->desc.ld_tgt_count);
 537         rc = md_getattr(lmv->tgts[i].ltd_exp, fid,
 538                              valid, ea_size, request);
 539         if (rc == 0 && obj) {
 540                 /* we have to loop over dirobjs here and gather attrs
 541                  * for all the slaves */
 542 #warning "attrs gathering here"
 543         }
 544         lmv_put_obj(obj);
 545         RETURN(rc);
 546 }
 547
 548 static int lmv_change_cbdata(struct obd_export *exp,
 549                                  struct ll_fid *fid,
 550                                  ldlm_iterator_t it, void *data)
 551 {
 552         struct obd_device *obd = exp->exp_obd;
 553         struct lmv_obd *lmv = &obd->u.lmv;
 554         int rc = 0;
 555         ENTRY;
 556
 557         rc = lmv_check_connect(obd);
 558         if (rc)
 559                 RETURN(rc);
 560         CDEBUG(D_OTHER, "CBDATA for %lu/%lu/%lu\n",
 561                (unsigned long) fid->mds,
 562                (unsigned long) fid->id,
 563                (unsigned long) fid->generation);
 564         LASSERT(fid->mds < lmv->desc.ld_tgt_count);
 565         rc = md_change_cbdata(lmv->tgts[fid->mds].ltd_exp, fid, it, data);
 566         RETURN(rc);
 567 }
 568
 569 static int lmv_change_cbdata_name(struct obd_export *exp, struct ll_fid *pfid,
 570                                   char *name, int len, struct ll_fid *cfid,
 571                                   ldlm_iterator_t it, void *data)
 572 {
 573         struct obd_device *obd = exp->exp_obd;
 574         struct lmv_obd *lmv = &obd->u.lmv;
 575         struct lmv_obj *obj;
 576         int rc = 0, mds;
 577         ENTRY;
 578         rc = lmv_check_connect(obd);
 579         if (rc)
 580                 RETURN(rc);
 581         LASSERT(pfid->mds < lmv->desc.ld_tgt_count);
 582         LASSERT(cfid->mds < lmv->desc.ld_tgt_count);
 583         CDEBUG(D_OTHER, "CBDATA for %lu/%lu/%lu:%*s -> %lu/%lu/%lu\n",
 584                (unsigned long) pfid->mds, (unsigned long) pfid->id,
 585                (unsigned long) pfid->generation, len, name,
 586                (unsigned long) cfid->mds, (unsigned long) cfid->id,
 587                (unsigned long) cfid->generation);
 588
 589         /* this is default mds for directory name belongs to */
 590         mds = pfid->mds;
 591         obj = lmv_grab_obj(obd, pfid, 0);
 592         if (obj) {
 593                 /* directory is splitted. look for right mds for this name */
 594                 mds = raw_name2idx(obj->objcount, name, len);
 595                 lmv_put_obj(obj);
 596         }
 597         rc = md_change_cbdata(lmv->tgts[mds].ltd_exp, cfid, it, data);
 598         RETURN(rc);
 599 }
 600
 601 static int lmv_valid_attrs(struct obd_export *exp, struct ll_fid *fid)
 602 {
 603         struct obd_device *obd = exp->exp_obd;
 604         struct lmv_obd *lmv = &obd->u.lmv;
 605         int rc = 0;
 606         ENTRY;
 607         rc = lmv_check_connect(obd);
 608         if (rc)
 609                 RETURN(rc);
 610         CDEBUG(D_OTHER, "validate %lu/%lu/%lu\n",
 611                (unsigned long) fid->mds,
 612                (unsigned long) fid->id,
 613                (unsigned long) fid->generation);
 614         LASSERT(fid->mds < lmv->desc.ld_tgt_count);
 615         rc = md_valid_attrs(lmv->tgts[fid->mds].ltd_exp, fid);
 616         RETURN(rc);
 617 }
 618
 619 int lmv_close(struct obd_export *exp, struct obdo *obdo,
 620                   struct obd_client_handle *och,
 621                   struct ptlrpc_request **request)
 622 {
 623         struct obd_device *obd = exp->exp_obd;
 624         struct lmv_obd *lmv = &obd->u.lmv;
 625         int rc, i = obdo->o_mds;
 626         ENTRY;
 627         rc = lmv_check_connect(obd);
 628         if (rc)
 629                 RETURN(rc);
 630         LASSERT(i < lmv->desc.ld_tgt_count);
 631         CDEBUG(D_OTHER, "CLOSE %lu/%lu/%lu\n", (unsigned long) obdo->o_mds,
 632                (unsigned long) obdo->o_id, (unsigned long) obdo->o_generation);
 633         rc = md_close(lmv->tgts[i].ltd_exp, obdo, och, request);
 634         RETURN(rc);
 635 }
 636
 637 int lmv_get_mea_and_update_object(struct obd_export *exp, struct ll_fid *fid)
 638 {
 639         struct obd_device *obd = exp->exp_obd;
 640         struct lmv_obd *lmv = &obd->u.lmv;
 641         struct ptlrpc_request *req = NULL;
 642         struct lustre_md md;
 643         unsigned long valid;
 644         int mealen, rc;
 645
 646         md.mea = NULL;
 647         mealen = MEA_SIZE_LMV(lmv);
 648
 649         valid = OBD_MD_FLEASIZE | OBD_MD_FLDIREA;
 650
 651         /* time to update mea of parent fid */
 652         rc = md_getattr(lmv->tgts[fid->mds].ltd_exp, fid,
 653                         valid, mealen, &req);
 654         if (rc) {
 655                 CERROR("md_getattr() failed, rc = %d\n", rc);
 656                 GOTO(cleanup, rc);
 657         }
 658
 659         rc = mdc_req2lustre_md(exp, req, 0, NULL, &md);
 660         if (rc) {
 661                 CERROR("mdc_req2lustre_md() failed, rc = %d\n", rc);
 662                 GOTO(cleanup, rc);
 663         }
 664
 665         if (md.mea == NULL)
 666                 GOTO(cleanup, rc = -ENODATA);
 667
 668         rc = lmv_create_obj_from_attrs(exp, fid, md.mea);
 669         obd_free_memmd(exp, (struct lov_stripe_md **) &md.mea);
 670
 671 cleanup:
 672         if (req)
 673                 ptlrpc_req_finished(req);
 674         RETURN(rc);
 675 }
 676
 677 int lmv_create(struct obd_export *exp, struct mdc_op_data *op_data,
 678                const void *data, int datalen, int mode, __u32 uid,
 679                __u32 gid, __u64 rdev, struct ptlrpc_request **request)
 680 {
 681         struct obd_device *obd = exp->exp_obd;
 682         struct lmv_obd *lmv = &obd->u.lmv;
 683         struct mds_body *mds_body;
 684         struct lmv_obj *obj;
 685         int rc, mds;
 686         ENTRY;
 687
 688         rc = lmv_check_connect(obd);
 689         if (rc)
 690                 RETURN(rc);
 691
 692         if (!lmv->desc.ld_active_tgt_count)
 693                 RETURN(-EIO);
 694 repeat:
 695         obj = lmv_grab_obj(obd, &op_data->fid1, 0);
 696         if (obj) {
 697                 mds = raw_name2idx(obj->objcount, op_data->name,
 698                                    op_data->namelen);
 699                 op_data->fid1 = obj->objs[mds].fid;
 700                 lmv_put_obj(obj);
 701         }
 702
 703         CDEBUG(D_OTHER, "CREATE '%*s' on %lu/%lu/%lu\n",
 704                         op_data->namelen, op_data->name,
 705                         (unsigned long) op_data->fid1.mds,
 706                         (unsigned long) op_data->fid1.id,
 707                         (unsigned long) op_data->fid1.generation);
 708         rc = md_create(lmv->tgts[op_data->fid1.mds].ltd_exp, op_data, data,
 709                        datalen, mode, uid, gid, rdev, request);
 710         if (rc == 0) {
 711                 if (*request == NULL)
 712                      RETURN(rc);
 713                 mds_body = lustre_msg_buf((*request)->rq_repmsg, 0,
 714                                           sizeof(*mds_body));
 715                 LASSERT(mds_body != NULL);
 716                 CDEBUG(D_OTHER, "created. id = %lu, generation = %lu, mds = %d\n",
 717                        (unsigned long) mds_body->fid1.id,
 718                        (unsigned long) mds_body->fid1.generation,
 719                        op_data->fid1.mds);
 720                 LASSERT(mds_body->valid & OBD_MD_MDS ||
 721                         mds_body->mds == op_data->fid1.mds);
 722         } else if (rc == -ERESTART) {
 723                 /* directory got splitted. time to update local object
 724                  * and repeat the request with proper MDS */
 725                 rc = lmv_get_mea_and_update_object(exp, &op_data->fid1);
 726                 if (rc == 0) {
 727                         ptlrpc_req_finished(*request);
 728                         goto repeat;
 729                 }
 730         }
 731         RETURN(rc);
 732 }
 733
 734 int lmv_done_writing(struct obd_export *exp, struct obdo *obdo)
 735 {
 736         struct obd_device *obd = exp->exp_obd;
 737         struct lmv_obd *lmv = &obd->u.lmv;
 738         int rc;
 739         ENTRY;
 740         rc = lmv_check_connect(obd);
 741         if (rc)
 742                 RETURN(rc);
 743
 744         /* FIXME: choose right MDC here */
 745         CWARN("this method isn't implemented yet\n");
 746         rc = md_done_writing(lmv->tgts[0].ltd_exp, obdo);
 747         RETURN(rc);
 748 }
 749
 750 int lmv_enqueue_slaves(struct obd_export *exp, int locktype,
 751                          struct lookup_intent *it, int lockmode,
 752                          struct mdc_op_data *data, struct lustre_handle *lockh,
 753                          void *lmm, int lmmsize,
 754                          ldlm_completion_callback cb_completion,
 755                          ldlm_blocking_callback cb_blocking, void *cb_data)
 756 {
 757         struct obd_device *obd = exp->exp_obd;
 758         struct lmv_obd *lmv = &obd->u.lmv;
 759         struct mea *mea = data->mea1;
 760         struct mdc_op_data data2;
 761         int i, rc, mds;
 762         ENTRY;
 763
 764         LASSERT(mea != NULL);
 765         for (i = 0; i < mea->mea_count; i++) {
 766                 if (lmv->tgts[i].ltd_exp == NULL)
 767                         continue;
 768
 769                 memset(&data2, 0, sizeof(data2));
 770                 data2.fid1 = mea->mea_fids[i];
 771                 mds = data2.fid1.mds;
 772                 rc = md_enqueue(lmv->tgts[mds].ltd_exp, locktype, it, lockmode,
 773                                 &data2, lockh + i, lmm, lmmsize, cb_completion,
 774                                 cb_blocking, cb_data);
 775                 CDEBUG(D_OTHER, "take lock on slave %lu/%lu/%lu -> %d/%d\n",
 776                        (unsigned long) mea->mea_fids[i].mds,
 777                        (unsigned long) mea->mea_fids[i].id,
 778                        (unsigned long) mea->mea_fids[i].generation,
 779                        rc, it->d.lustre.it_status);
 780                 if (rc)
 781                         GOTO(cleanup, rc);
 782                 if (it->d.lustre.it_data) {
 783                         struct ptlrpc_request *req;
 784                         req = (struct ptlrpc_request *) it->d.lustre.it_data;
 785                         ptlrpc_req_finished(req);
 786                 }
 787
 788                 if (it->d.lustre.it_status)
 789                         GOTO(cleanup, rc = it->d.lustre.it_status);
 790         }
 791         RETURN(0);
 792
 793 cleanup:
 794         /* drop all taken locks */
 795         while (--i >= 0) {
 796                 if (lockh[i].cookie)
 797                         ldlm_lock_decref(lockh + i, lockmode);
 798                 lockh[i].cookie = 0;
 799         }
 800         RETURN(rc);
 801 }
 802
 803 int lmv_enqueue(struct obd_export *exp, int lock_type,
 804                 struct lookup_intent *it, int lock_mode,
 805                 struct mdc_op_data *data, struct lustre_handle *lockh,
 806                 void *lmm, int lmmsize,
 807                 ldlm_completion_callback cb_completion,
 808                 ldlm_blocking_callback cb_blocking, void *cb_data)
 809 {
 810         struct obd_device *obd = exp->exp_obd;
 811         struct lmv_obd *lmv = &obd->u.lmv;
 812         struct lmv_obj *obj;
 813         int rc, mds;
 814         ENTRY;
 815
 816         rc = lmv_check_connect(obd);
 817         if (rc)
 818                 RETURN(rc);
 819
 820         if (it->it_op == IT_UNLINK) {
 821                 rc = lmv_enqueue_slaves(exp, lock_type, it, lock_mode,
 822                                         data, lockh, lmm, lmmsize,
 823                                         cb_completion, cb_blocking, cb_data);
 824                 RETURN(rc);
 825         }
 826
 827         if (data->namelen) {
 828                 obj = lmv_grab_obj(obd, &data->fid1, 0);
 829                 if (obj) {
 830                         /* directory is splitted. look for
 831                          * right mds for this name */
 832                         mds = raw_name2idx(obj->objcount, (char *)data->name,
 833                                            data->namelen);
 834                         data->fid1 = obj->objs[mds].fid;
 835                         lmv_put_obj(obj);
 836                 }
 837         }
 838         CDEBUG(D_OTHER, "ENQUEUE '%s' on %lu/%lu\n",
 839                LL_IT2STR(it), (unsigned long) data->fid1.id,
 840                (unsigned long) data->fid1.generation);
 841         rc = md_enqueue(lmv->tgts[data->fid1.mds].ltd_exp, lock_type, it,
 842                         lock_mode, data, lockh, lmm, lmmsize, cb_completion,
 843                         cb_blocking, cb_data);
 844
 845         RETURN(rc);
 846 }
 847
 848 int lmv_getattr_name(struct obd_export *exp, struct ll_fid *fid,
 849                          char *filename, int namelen, unsigned long valid,
 850                          unsigned int ea_size, struct ptlrpc_request **request)
 851 {
 852         struct obd_device *obd = exp->exp_obd;
 853         struct lmv_obd *lmv = &obd->u.lmv;
 854         struct ll_fid rfid = *fid;
 855         int rc, mds = fid->mds;
 856         struct mds_body *body;
 857         struct lmv_obj *obj;
 858         ENTRY;
 859         rc = lmv_check_connect(obd);
 860         if (rc)
 861                 RETURN(rc);
 862 repeat:
 863         obj = lmv_grab_obj(obd, fid, 0);
 864         if (obj) {
 865                 /* directory is splitted. look for right mds for this name */
 866                 mds = raw_name2idx(obj->objcount, filename, namelen - 1);
 867                 rfid = obj->objs[mds].fid;
 868                 lmv_put_obj(obj);
 869         }
 870         CDEBUG(D_OTHER, "getattr_name for %*s on %lu/%lu/%lu -> %lu/%lu/%lu\n",
 871                namelen, filename, (unsigned long) fid->mds,
 872                (unsigned long) fid->id, (unsigned long) fid->generation,
 873                (unsigned long) rfid.mds, (unsigned long) rfid.id,
 874                (unsigned long) rfid.generation);
 875         rc = md_getattr_name(lmv->tgts[mds].ltd_exp, &rfid, filename, namelen,
 876                                   valid, ea_size, request);
 877         if (rc == 0) {
 878                 /* this could be cross-node reference. in this case all
 879                  * we have right now is mds/ino/generation triple. we'd
 880                  * like to find other attributes */
 881                 body = lustre_msg_buf((*request)->rq_repmsg, 0, sizeof(*body));
 882                 LASSERT(body != NULL);
 883                 if (body->valid & OBD_MD_MDS) {
 884                         struct ptlrpc_request *req = NULL;
 885                         rfid = body->fid1;
 886                         CDEBUG(D_OTHER, "request attrs for %lu/%lu/%lu\n",
 887                                (unsigned long) rfid.mds,
 888                                (unsigned long) rfid.id,
 889                                (unsigned long) rfid.generation);
 890                         rc = md_getattr_name(lmv->tgts[rfid.mds].ltd_exp, &rfid,
 891                                              NULL, 1, valid, ea_size, &req);
 892                         ptlrpc_req_finished(*request);
 893                         *request = req;
 894                 }
 895         } else if (rc == -ERESTART) {
 896                 /* directory got splitted. time to update local object
 897                  * and repeat the request with proper MDS */
 898                 rc = lmv_get_mea_and_update_object(exp, &rfid);
 899                 if (rc == 0) {
 900                         ptlrpc_req_finished(*request);
 901                         goto repeat;
 902                 }
 903         }
 904         RETURN(rc);
 905 }
 906
 907
 908 /*
 909  * llite passes fid of an target inode in data->fid1 and
 910  * fid of directory in data->fid2
 911  */
 912 int lmv_link(struct obd_export *exp, struct mdc_op_data *data,
 913              struct ptlrpc_request **request)
 914 {
 915         struct obd_device *obd = exp->exp_obd;
 916         struct lmv_obd *lmv = &obd->u.lmv;
 917         struct lmv_obj *obj;
 918         int rc;
 919         ENTRY;
 920         rc = lmv_check_connect(obd);
 921         if (rc)
 922                 RETURN(rc);
 923         if (data->namelen != 0) {
 924                 /* usual link request */
 925                 obj = lmv_grab_obj(obd, &data->fid1, 0);
 926                 if (obj) {
 927                         rc = raw_name2idx(obj->objcount, data->name,
 928                                          data->namelen);
 929                         data->fid1 = obj->objs[rc].fid;
 930                         lmv_put_obj(obj);
 931                 }
 932                 CDEBUG(D_OTHER,"link %u/%u/%u:%*s to %u/%u/%u mds %d\n",
 933                        (unsigned) data->fid2.mds, (unsigned) data->fid2.id,
 934                        (unsigned) data->fid2.generation, data->namelen,
 935                        data->name, (unsigned) data->fid1.mds,
 936                        (unsigned) data->fid1.id,
 937                        (unsigned) data->fid1.generation, data->fid1.mds);
 938         } else {
 939                 /* request from MDS to acquire i_links for inode by fid1 */
 940                 CDEBUG(D_OTHER, "inc i_nlinks for %u/%u/%u\n",
 941                        (unsigned) data->fid1.mds, (unsigned) data->fid1.id,
 942                        (unsigned) data->fid1.generation);
 943         }
 944
 945         rc = md_link(lmv->tgts[data->fid1.mds].ltd_exp, data, request);
 946         RETURN(rc);
 947 }
 948
 949 int lmv_rename(struct obd_export *exp, struct mdc_op_data *data,
 950                const char *old, int oldlen, const char *new, int newlen,
 951                struct ptlrpc_request **request)
 952 {
 953         struct obd_device *obd = exp->exp_obd;
 954         struct lmv_obd *lmv = &obd->u.lmv;
 955         struct lmv_obj *obj;
 956         int rc, mds;
 957         ENTRY;
 958
 959         CDEBUG(D_OTHER, "rename %*s in %lu/%lu/%lu to %*s in %lu/%lu/%lu\n",
 960                oldlen, old, (unsigned long) data->fid1.mds,
 961                (unsigned long) data->fid1.id,
 962                (unsigned long) data->fid1.generation,
 963                newlen, new, (unsigned long) data->fid2.mds,
 964                (unsigned long) data->fid2.id,
 965                (unsigned long) data->fid2.generation);
 966         if (!fid_equal(&data->fid1, &data->fid2))
 967                 CWARN("cross-node rename %lu/%lu/%lu:%*s to %lu/%lu/%lu:%*s\n",
 968                       (unsigned long) data->fid1.mds,
 969                       (unsigned long) data->fid1.id,
 970                       (unsigned long) data->fid1.generation, oldlen, old,
 971                       (unsigned long) data->fid2.mds,
 972                       (unsigned long) data->fid2.id,
 973                       (unsigned long) data->fid2.generation, newlen, new);
 974
 975         rc = lmv_check_connect(obd);
 976         if (rc)
 977                 RETURN(rc);
 978
 979         if (oldlen == 0) {
 980                 /* MDS with old dir entry is asking another MDS
 981                  * to create name there */
 982                 CDEBUG(D_OTHER,
 983                        "create %*s(%d/%d) in %lu/%lu/%lu pointing to %lu/%lu/%lu\n",
 984                        newlen, new, oldlen, newlen,
 985                        (unsigned long) data->fid2.mds,
 986                        (unsigned long) data->fid2.id,
 987                        (unsigned long) data->fid2.generation,
 988                        (unsigned long) data->fid1.mds,
 989                        (unsigned long) data->fid1.id,
 990                        (unsigned long) data->fid1.generation);
 991                 mds = data->fid2.mds;
 992                 goto request;
 993         }
 994
 995         obj = lmv_grab_obj(obd, &data->fid1, 0);
 996         if (obj) {
 997                 /* directory is already splitted, so we have to forward
 998                  * request to the right MDS */
 999                 mds = raw_name2idx(obj->objcount, (char *)old, oldlen);
1000                 data->fid1 = obj->objs[mds].fid;
1001                 CDEBUG(D_OTHER, "forward to MDS #%u (%lu/%lu/%lu)\n", mds,
1002                        (unsigned long) obj->objs[mds].fid.mds,
1003                        (unsigned long) obj->objs[mds].fid.id,
1004                        (unsigned long) obj->objs[mds].fid.generation);
1005         }
1006         lmv_put_obj(obj);
1007
1008         obj = lmv_grab_obj(obd, &data->fid2, 0);
1009         if (obj) {
1010                 /* directory is already splitted, so we have to forward
1011                  * request to the right MDS */
1012                 mds = raw_name2idx(obj->objcount, (char *)new, newlen);
1013                 data->fid2 = obj->objs[mds].fid;
1014                 CDEBUG(D_OTHER, "forward to MDS #%u (%lu/%lu/%lu)\n", mds,
1015                        (unsigned long) obj->objs[mds].fid.mds,
1016                        (unsigned long) obj->objs[mds].fid.id,
1017                        (unsigned long) obj->objs[mds].fid.generation);
1018         }
1019         lmv_put_obj(obj);
1020
1021         mds = data->fid1.mds;
1022
1023 request:
1024         rc = md_rename(lmv->tgts[mds].ltd_exp, data, old, oldlen,
1025                        new, newlen, request);
1026         RETURN(rc);
1027 }
1028
1029 int lmv_setattr(struct obd_export *exp, struct mdc_op_data *data,
1030                 struct iattr *iattr, void *ea, int ealen, void *ea2, int ea2len,
1031                 struct ptlrpc_request **request)
1032 {
1033         struct obd_device *obd = exp->exp_obd;
1034         struct lmv_obd *lmv = &obd->u.lmv;
1035         int rc = 0, i = data->fid1.mds;
1036         struct ptlrpc_request *req;
1037         struct mds_body *mds_body;
1038         struct lmv_obj *obj;
1039         ENTRY;
1040
1041         rc = lmv_check_connect(obd);
1042         if (rc)
1043                 RETURN(rc);
1044
1045         obj = lmv_grab_obj(obd, &data->fid1, 0);
1046         CDEBUG(D_OTHER, "SETATTR for %lu/%lu/%lu, valid 0x%x%s\n",
1047                (unsigned long) data->fid1.mds,
1048                (unsigned long) data->fid1.id,
1049                (unsigned long) data->fid1.generation, iattr->ia_valid,
1050                obj ? ", splitted" : "");
1051         if (obj) {
1052                 for (i = 0; i < obj->objcount; i++) {
1053                         data->fid1 = obj->objs[i].fid;
1054                         rc = md_setattr(lmv->tgts[i].ltd_exp, data, iattr, ea,
1055                                         ealen, ea2, ea2len, &req);
1056                         LASSERT(rc == 0);
1057                         if (fid_equal(&obj->fid, &obj->objs[i].fid)) {
1058                                 /* this is master object and this request
1059                                  * should be returned back to llite */
1060                                 *request = req;
1061                         } else {
1062                                 ptlrpc_req_finished(req);
1063                         }
1064                 }
1065                 lmv_put_obj(obj);
1066         } else {
1067                 LASSERT(data->fid1.mds < lmv->desc.ld_tgt_count);
1068                 rc = md_setattr(lmv->tgts[i].ltd_exp, data, iattr, ea, ealen,
1069                                 ea2, ea2len, request);
1070                 if (rc == 0) {
1071                         mds_body = lustre_msg_buf((*request)->rq_repmsg, 0,
1072                                         sizeof(*mds_body));
1073                         LASSERT(mds_body != NULL);
1074                         LASSERT(mds_body->mds == i);
1075                 }
1076         }
1077         RETURN(rc);
1078 }
1079
1080 int lmv_sync(struct obd_export *exp, struct ll_fid *fid,
1081              struct ptlrpc_request **request)
1082 {
1083         struct obd_device *obd = exp->exp_obd;
1084         struct lmv_obd *lmv = &obd->u.lmv;
1085         int rc;
1086         ENTRY;
1087
1088         rc = lmv_check_connect(obd);
1089         if (rc)
1090                 RETURN(rc);
1091
1092         rc = md_sync(lmv->tgts[0].ltd_exp, fid, request);
1093         RETURN(rc);
1094 }
1095
1096 int lmv_dirobj_blocking_ast(struct ldlm_lock *lock,
1097                             struct ldlm_lock_desc *desc, void *data, int flag)
1098 {
1099         struct lustre_handle lockh;
1100         struct lmv_obj *obj;
1101         int rc;
1102         ENTRY;
1103
1104         switch (flag) {
1105         case LDLM_CB_BLOCKING:
1106                 ldlm_lock2handle(lock, &lockh);
1107                 rc = ldlm_cli_cancel(&lockh);
1108                 if (rc < 0) {
1109                         CDEBUG(D_INODE, "ldlm_cli_cancel: %d\n", rc);
1110                         RETURN(rc);
1111                 }
1112                 break;
1113         case LDLM_CB_CANCELING:
1114                 /* time to drop cached attrs for dirobj */
1115                 obj = lock->l_ast_data;
1116                 if (!obj)
1117                         break;
1118
1119                 CDEBUG(D_OTHER, "cancel %s on %lu/%lu, master %lu/%lu/%lu\n",
1120                        lock->l_resource->lr_name.name[3] == 1 ?
1121                                 "LOOKUP" : "UPDATE",
1122                        (unsigned long) lock->l_resource->lr_name.name[0],
1123                        (unsigned long) lock->l_resource->lr_name.name[1],
1124                        (unsigned long) obj->fid.mds,
1125                        (unsigned long) obj->fid.id,
1126                        (unsigned long) obj->fid.generation);
1127                 break;
1128         default:
1129                 LBUG();
1130         }
1131         RETURN(0);
1132 }
1133
1134 void lmv_remove_dots(struct page *page)
1135 {
1136         char *kaddr = page_address(page);
1137         unsigned limit = PAGE_CACHE_SIZE;
1138         unsigned offs, rec_len;
1139         struct ext2_dir_entry_2 *p;
1140
1141         for (offs = 0; offs <= limit - EXT2_DIR_REC_LEN(1); offs += rec_len) {
1142                 p = (struct ext2_dir_entry_2 *)(kaddr + offs);
1143                 rec_len = le16_to_cpu(p->rec_len);
1144
1145                 if ((p->name_len == 1 && p->name[0] == '.') ||
1146                     (p->name_len == 2 && p->name[0] == '.' && p->name[1] == '.'))
1147                         p->inode = 0;
1148         }
1149 }
1150
1151 int lmv_readpage(struct obd_export *exp, struct ll_fid *mdc_fid,
1152                  __u64 offset, struct page *page,
1153                  struct ptlrpc_request **request)
1154 {
1155         struct obd_device *obd = exp->exp_obd;
1156         struct lmv_obd *lmv = &obd->u.lmv;
1157         struct ll_fid rfid = *mdc_fid;
1158         struct lmv_obj *obj;
1159         int rc, i;
1160         ENTRY;
1161
1162         rc = lmv_check_connect(obd);
1163         if (rc)
1164                 RETURN(rc);
1165
1166         LASSERT(mdc_fid->mds < lmv->desc.ld_tgt_count);
1167         CDEBUG(D_OTHER, "READPAGE at %llu from %lu/%lu/%lu\n",
1168                offset, (unsigned long) rfid.mds,
1169                (unsigned long) rfid.id,
1170                (unsigned long) rfid.generation);
1171
1172         obj = lmv_grab_obj(obd, mdc_fid, 0);
1173         if (obj) {
1174                 /* find dirobj containing page with requested offset */
1175                 /* FIXME: what about protecting cached attrs here? */
1176                 for (i = 0; i < obj->objcount; i++) {
1177                         if (offset < obj->objs[i].size)
1178                                 break;
1179                         offset -= obj->objs[i].size;
1180                 }
1181                 rfid = obj->objs[i].fid;
1182                 CDEBUG(D_OTHER, "forward to %lu/%lu/%lu with offset %lu\n",
1183                        (unsigned long) rfid.mds,
1184                        (unsigned long) rfid.id,
1185                        (unsigned long) rfid.generation,
1186                        (unsigned long) offset);
1187         }
1188         rc = md_readpage(lmv->tgts[rfid.mds].ltd_exp, &rfid, offset, page, request);
1189         if (rc == 0 && !fid_equal(&rfid, mdc_fid)) {
1190                 /* this page isn't from master object. to avoid
1191                  * ./.. duplication in directory, we have to remove them
1192                  * from all slave objects */
1193                 lmv_remove_dots(page);
1194         }
1195
1196         lmv_put_obj(obj);
1197
1198         RETURN(rc);
1199 }
1200
1201 int lmv_unlink_slaves(struct obd_export *exp, struct mdc_op_data *data,
1202                       struct ptlrpc_request **req)
1203 {
1204         struct obd_device *obd = exp->exp_obd;
1205         struct lmv_obd *lmv = &obd->u.lmv;
1206         struct mea *mea = data->mea1;
1207         struct mdc_op_data data2;
1208         int i, rc = 0, mds;
1209         ENTRY;
1210
1211         LASSERT(mea != NULL);
1212         for (i = 0; i < mea->mea_count; i++) {
1213                 if (lmv->tgts[i].ltd_exp == NULL)
1214                         continue;
1215
1216                 memset(&data2, 0, sizeof(data2));
1217                 data2.fid1 = mea->mea_fids[i];
1218                 data2.create_mode = MDS_MODE_DONT_LOCK | S_IFDIR;
1219                 mds = data2.fid1.mds;
1220                 rc = md_unlink(lmv->tgts[mds].ltd_exp, &data2, req);
1221                 CDEBUG(D_OTHER, "unlink slave %lu/%lu/%lu -> %d\n",
1222                        (unsigned long) mea->mea_fids[i].mds,
1223                        (unsigned long) mea->mea_fids[i].id,
1224                        (unsigned long) mea->mea_fids[i].generation, rc);
1225                 if (*req) {
1226                         ptlrpc_req_finished(*req);
1227                         *req = NULL;
1228                 }
1229                 if (rc)
1230                         break;
1231         }
1232         RETURN(rc);
1233 }
1234
1235 int lmv_unlink(struct obd_export *exp, struct mdc_op_data *data,
1236                struct ptlrpc_request **request)
1237 {
1238         struct obd_device *obd = exp->exp_obd;
1239         struct lmv_obd *lmv = &obd->u.lmv;
1240         int rc, i = 0;
1241         ENTRY;
1242         rc = lmv_check_connect(obd);
1243         if (rc)
1244                 RETURN(rc);
1245
1246         if (data->namelen == 0 && data->mea1 != NULL) {
1247                 /* mds asks to remove slave objects */
1248                 rc = lmv_unlink_slaves(exp, data, request);
1249                 RETURN(rc);
1250         } else if (data->namelen != 0) {
1251                 struct lmv_obj *obj;
1252                 obj = lmv_grab_obj(obd, &data->fid1, 0);
1253                 if (obj) {
1254                         i = raw_name2idx(obj->objcount, data->name,
1255                                          data->namelen);
1256                         data->fid1 = obj->objs[i].fid;
1257                         lmv_put_obj(obj);
1258                 }
1259                 CDEBUG(D_OTHER, "unlink '%*s' in %lu/%lu/%lu -> %u\n",
1260                        data->namelen, data->name,
1261                        (unsigned long) data->fid1.mds,
1262                        (unsigned long) data->fid1.id,
1263                        (unsigned long) data->fid1.generation, i);
1264         } else {
1265                 CDEBUG(D_OTHER, "drop i_nlink on %lu/%lu/%lu\n",
1266                        (unsigned long) data->fid1.mds,
1267                        (unsigned long) data->fid1.id,
1268                        (unsigned long) data->fid1.generation);
1269         }
1270         rc = md_unlink(lmv->tgts[data->fid1.mds].ltd_exp, data, request);
1271         RETURN(rc);
1272 }
1273
1274 struct obd_device *lmv_get_real_obd(struct obd_export *exp,
1275                                     char *name, int len)
1276 {
1277         struct obd_device *obd = exp->exp_obd;
1278         struct lmv_obd *lmv = &obd->u.lmv;
1279         int rc;
1280         ENTRY;
1281
1282         rc = lmv_check_connect(obd);
1283         if (rc)
1284                 RETURN(ERR_PTR(rc));
1285         obd = lmv->tgts[0].ltd_exp->exp_obd;
1286         EXIT;
1287         return obd;
1288 }
1289
1290 int lmv_init_ea_size(struct obd_export *exp, int easize, int cookiesize)
1291 {
1292         struct obd_device *obd = exp->exp_obd;
1293         struct lmv_obd *lmv = &obd->u.lmv;
1294         int i, rc = 0, change = 0;
1295         ENTRY;
1296
1297         if (lmv->max_easize < easize) {
1298                 lmv->max_easize = easize;
1299                 change = 1;
1300         }
1301         if (lmv->max_cookiesize < cookiesize) {
1302                 lmv->max_cookiesize = cookiesize;
1303                 change = 1;
1304         }
1305         if (change == 0)
1306                 RETURN(0);
1307
1308         if (lmv->connected == 0)
1309                 RETURN(0);
1310
1311         /* FIXME: error handling? */
1312         for (i = 0; i < lmv->desc.ld_tgt_count; i++)
1313                 rc = obd_init_ea_size(lmv->tgts[i].ltd_exp, easize, cookiesize);
1314         RETURN(rc);
1315 }
1316
1317 int lmv_obd_create_single(struct obd_export *exp, struct obdo *oa,
1318                           struct lov_stripe_md **ea, struct obd_trans_info *oti)
1319 {
1320         struct obd_device *obd = exp->exp_obd;
1321         struct lmv_obd *lmv = &obd->u.lmv;
1322         struct lov_stripe_md obj_md;
1323         struct lov_stripe_md *obj_mdp = &obj_md;
1324         int rc = 0;
1325         ENTRY;
1326
1327         rc = lmv_check_connect(obd);
1328         if (rc)
1329                 RETURN(rc);
1330
1331         LASSERT(ea == NULL);
1332         LASSERT(oa->o_mds < lmv->desc.ld_tgt_count);
1333
1334         rc = obd_create(lmv->tgts[oa->o_mds].ltd_exp, oa, &obj_mdp, oti);
1335         LASSERT(rc == 0);
1336
1337         RETURN(rc);
1338 }
1339
1340 /*
1341  * to be called from MDS only
1342  */
1343 int lmv_obd_create(struct obd_export *exp, struct obdo *oa,
1344                    struct lov_stripe_md **ea, struct obd_trans_info *oti)
1345 {
1346         struct obd_device *obd = exp->exp_obd;
1347         struct lmv_obd *lmv = &obd->u.lmv;
1348         struct mea *mea;
1349         int i, c, rc = 0;
1350         struct ll_fid mfid;
1351         ENTRY;
1352
1353         rc = lmv_check_connect(obd);
1354         if (rc)
1355                 RETURN(rc);
1356
1357         LASSERT(oa != NULL);
1358
1359         if (ea == NULL) {
1360                 rc = lmv_obd_create_single(exp, oa, NULL, oti);
1361                 RETURN(rc);
1362         }
1363
1364         if (*ea == NULL) {
1365                 rc = obd_alloc_diskmd(exp, (struct lov_mds_md **)ea);
1366                 LASSERT(*ea != NULL);
1367         }
1368
1369         mea = (struct mea *)*ea;
1370         mfid.id = oa->o_id;
1371         mfid.generation = oa->o_generation;
1372         rc = 0;
1373         if (!mea->mea_count || mea->mea_count > lmv->desc.ld_tgt_count)
1374                 mea->mea_count = lmv->desc.ld_tgt_count;
1375
1376         mea->mea_master = -1;
1377
1378         /* FIXME: error handling? */
1379         for (i = 0, c = 0; c < mea->mea_count &&
1380                 i < lmv->desc.ld_tgt_count; i++) {
1381                 struct lov_stripe_md obj_md;
1382                 struct lov_stripe_md *obj_mdp = &obj_md;
1383
1384                 if (lmv->tgts[i].ltd_exp == NULL) {
1385                         /* this is master MDS */
1386                         mea->mea_fids[c].id = mfid.id;
1387                         mea->mea_fids[c].generation = mfid.generation;
1388                         mea->mea_fids[c].mds = i;
1389                         mea->mea_master = i;
1390                         c++;
1391                         continue;
1392                 }
1393
1394                 /* "Master" MDS should always be part of stripped dir, so
1395                    scan for it */
1396                 if (mea->mea_master == -1 && c == mea->mea_count - 1)
1397                         continue;
1398
1399                 oa->o_valid = OBD_MD_FLGENER | OBD_MD_FLTYPE | OBD_MD_FLMODE
1400                                 | OBD_MD_FLUID | OBD_MD_FLGID | OBD_MD_FLID;
1401
1402                 rc = obd_create(lmv->tgts[c].ltd_exp, oa, &obj_mdp, oti);
1403                 /* FIXME: error handling here */
1404                 LASSERT(rc == 0);
1405
1406                 mea->mea_fids[c].id = oa->o_id;
1407                 mea->mea_fids[c].generation = oa->o_generation;
1408                 mea->mea_fids[c].mds = i;
1409                 c++;
1410                 CDEBUG(D_OTHER, "dirobj at mds %d: "LPU64"/%u\n",
1411                        i, oa->o_id, oa->o_generation);
1412         }
1413         LASSERT(c == mea->mea_count);
1414         CDEBUG(D_OTHER, "%d dirobjects created\n", (int) mea->mea_count);
1415
1416         RETURN(rc);
1417 }
1418
1419 static int lmv_get_info(struct obd_export *exp, __u32 keylen,
1420                         void *key, __u32 *vallen, void *val)
1421 {
1422         struct obd_device *obd;
1423         struct lmv_obd *lmv;
1424         ENTRY;
1425
1426         obd = class_exp2obd(exp);
1427         if (obd == NULL) {
1428                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
1429                        exp->exp_handle.h_cookie);
1430                 RETURN(-EINVAL);
1431         }
1432
1433         lmv = &obd->u.lmv;
1434         if (keylen == 6 && memcmp(key, "mdsize", 6) == 0) {
1435                 __u32 *mdsize = val;
1436                 *vallen = sizeof(__u32);
1437                 *mdsize = sizeof(struct ll_fid) * lmv->desc.ld_tgt_count
1438                                 + sizeof(struct mea);
1439                 RETURN(0);
1440         } else if (keylen == 6 && memcmp(key, "mdsnum", 6) == 0) {
1441                 struct obd_uuid *cluuid = &lmv->cluuid;
1442                 struct lmv_tgt_desc *tgts;
1443                 __u32 *mdsnum = val;
1444                 int i;
1445
1446                 for (i = 0, tgts = lmv->tgts; i < lmv->desc.ld_tgt_count; i++, tgts++) {
1447                         if (obd_uuid_equals(&tgts->uuid, cluuid)) {
1448                                 *vallen = sizeof(__u32);
1449                                 *mdsnum = i;
1450                                 RETURN(0);
1451                         }
1452                 }
1453                 LASSERT(0);
1454         }
1455
1456         CDEBUG(D_IOCTL, "invalid key\n");
1457         RETURN(-EINVAL);
1458 }
1459
1460 int lmv_set_info(struct obd_export *exp, obd_count keylen,
1461                  void *key, obd_count vallen, void *val)
1462 {
1463         struct obd_device *obd;
1464         struct lmv_obd *lmv;
1465         ENTRY;
1466
1467         obd = class_exp2obd(exp);
1468         if (obd == NULL) {
1469                 CDEBUG(D_IOCTL, "invalid client cookie "LPX64"\n",
1470                        exp->exp_handle.h_cookie);
1471                 RETURN(-EINVAL);
1472         }
1473         lmv = &obd->u.lmv;
1474
1475         if (keylen >= strlen("client") && strcmp(key, "client") == 0) {
1476                 struct lmv_tgt_desc *tgts;
1477                 int i, rc;
1478
1479                 rc = lmv_check_connect(obd);
1480                 if (rc)
1481                         RETURN(rc);
1482
1483                 for (i = 0, tgts = lmv->tgts;
1484                         i < lmv->desc.ld_tgt_count; i++, tgts++) {
1485                         rc = obd_set_info(tgts->ltd_exp, keylen, key, vallen, val);
1486                         if (rc)
1487                                 RETURN(rc);
1488                 }
1489                 RETURN(0);
1490         } else if (keylen >= strlen("inter_mds") && strcmp(key, "inter_mds") == 0) {
1491                 lmv->server_timeout = 1;
1492                 lmv_set_timeouts(obd);
1493                 RETURN(0);
1494         }
1495
1496         RETURN(-EINVAL);
1497 }
1498
1499 int lmv_packmd(struct obd_export *exp, struct lov_mds_md **lmmp,
1500                struct lov_stripe_md *lsm)
1501 {
1502         struct obd_device *obd = class_exp2obd(exp);
1503         struct lmv_obd *lmv = &obd->u.lmv;
1504         int mea_size;
1505         ENTRY;
1506
1507         mea_size = sizeof(struct ll_fid) *
1508                 lmv->desc.ld_tgt_count + sizeof(struct mea);
1509         if (!lmmp)
1510                 RETURN(mea_size);
1511
1512         if (*lmmp && !lsm) {
1513                 OBD_FREE(*lmmp, mea_size);
1514                 *lmmp = NULL;
1515                 RETURN(0);
1516         }
1517
1518         if (!*lmmp) {
1519                 OBD_ALLOC(*lmmp, mea_size);
1520                 if (!*lmmp)
1521                         RETURN(-ENOMEM);
1522         }
1523
1524         if (!lsm)
1525                 RETURN(mea_size);
1526
1527 #warning "MEA packing/convertation must be here! -bzzz"
1528         memcpy(*lmmp, lsm, mea_size);
1529         RETURN(mea_size);
1530 }
1531
1532 int lmv_unpackmd(struct obd_export *exp, struct lov_stripe_md **mem_tgt,
1533                         struct lov_mds_md *disk_src, int mdsize)
1534 {
1535         struct obd_device *obd = class_exp2obd(exp);
1536         struct lmv_obd *lmv = &obd->u.lmv;
1537         struct mea **tmea = (struct mea **) mem_tgt;
1538         struct mea *mea = (void *) disk_src;
1539         int mea_size;
1540         ENTRY;
1541
1542         mea_size = sizeof(struct ll_fid) *
1543                 lmv->desc.ld_tgt_count + sizeof(struct mea);
1544         if (mem_tgt == NULL)
1545                 return mea_size;
1546
1547         if (*mem_tgt != NULL && disk_src == NULL) {
1548                 OBD_FREE(*tmea, mea_size);
1549                 RETURN(0);
1550         }
1551
1552         LASSERT(mea_size == mdsize);
1553
1554         OBD_ALLOC(*tmea, mea_size);
1555         /* FIXME: error handling here */
1556         LASSERT(*tmea != NULL);
1557
1558         if (!disk_src)
1559                 RETURN(mea_size);
1560
1561 #warning "MEA unpacking/convertation must be here! -bzzz"
1562         memcpy(*tmea, mea, mdsize);
1563         RETURN(mea_size);
1564 }
1565
1566 int lmv_brw(int rw, struct obd_export *exp, struct obdo *oa,
1567                 struct lov_stripe_md *ea, obd_count oa_bufs,
1568                 struct brw_page *pgarr, struct obd_trans_info *oti)
1569 {
1570         struct obd_device *obd = exp->exp_obd;
1571         struct lmv_obd *lmv = &obd->u.lmv;
1572         struct mea *mea = (struct mea *) ea;
1573         int err;
1574
1575         LASSERT(oa != NULL);
1576         LASSERT(ea != NULL);
1577         LASSERT(pgarr != NULL);
1578         LASSERT(oa->o_mds < lmv->desc.ld_tgt_count);
1579
1580         oa->o_gr = mea->mea_fids[oa->o_mds].generation;
1581         oa->o_id = mea->mea_fids[oa->o_mds].id;
1582         oa->o_valid =  OBD_MD_FLID | OBD_MD_FLGROUP;
1583         err = obd_brw(rw, lmv->tgts[oa->o_mds].ltd_exp, oa,
1584                       NULL, oa_bufs, pgarr, oti);
1585         RETURN(err);
1586 }
1587
1588 struct obd_ops lmv_obd_ops = {
1589         .o_owner                = THIS_MODULE,
1590         .o_attach               = lmv_attach,
1591         .o_detach               = lmv_detach,
1592         .o_setup                = lmv_setup,
1593         .o_cleanup              = lmv_cleanup,
1594         .o_connect              = lmv_connect,
1595         .o_disconnect           = lmv_disconnect,
1596         .o_statfs               = lmv_statfs,
1597         .o_get_info             = lmv_get_info,
1598         .o_set_info             = lmv_set_info,
1599         .o_create               = lmv_obd_create,
1600         .o_packmd               = lmv_packmd,
1601         .o_unpackmd             = lmv_unpackmd,
1602         .o_brw                  = lmv_brw,
1603         .o_init_ea_size         = lmv_init_ea_size,
1604         .o_notify               = lmv_notify,
1605         .o_iocontrol            = lmv_iocontrol,
1606 };
1607
1608 struct md_ops lmv_md_ops = {
1609         .m_getstatus            = lmv_getstatus,
1610         .m_getattr              = lmv_getattr,
1611         .m_change_cbdata        = lmv_change_cbdata,
1612         .m_change_cbdata_name   = lmv_change_cbdata_name,
1613         .m_close                = lmv_close,
1614         .m_create               = lmv_create,
1615         .m_done_writing         = lmv_done_writing,
1616         .m_enqueue              = lmv_enqueue,
1617         .m_getattr_name         = lmv_getattr_name,
1618         .m_intent_lock          = lmv_intent_lock,
1619         .m_link                 = lmv_link,
1620         .m_rename               = lmv_rename,
1621         .m_setattr              = lmv_setattr,
1622         .m_sync                 = lmv_sync,
1623         .m_readpage             = lmv_readpage,
1624         .m_unlink               = lmv_unlink,
1625         .m_get_real_obd         = lmv_get_real_obd,
1626         .m_valid_attrs          = lmv_valid_attrs,
1627 };
1628
1629 int __init lmv_init(void)
1630 {
1631         struct lprocfs_static_vars lvars;
1632         int rc;
1633
1634         lprocfs_init_vars(lmv, &lvars);
1635         rc = class_register_type(&lmv_obd_ops, &lmv_md_ops,
1636                                  lvars.module_vars, OBD_LMV_DEVICENAME);
1637         RETURN(rc);
1638 }
1639
1640 #ifdef __KERNEL__
1641 static void lmv_exit(void)
1642 {
1643         class_unregister_type(OBD_LMV_DEVICENAME);
1644 }
1645
1646 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
1647 MODULE_DESCRIPTION("Lustre Logical Metadata Volume OBD driver");
1648 MODULE_LICENSE("GPL");
1649
1650 module_init(lmv_init);
1651 module_exit(lmv_exit);
1652 #endif